JPH1182416A - Hydraulic circuit device of hydraulic working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the circuit structure to reduce the manufacturing cost, and enhance the assembling property by generating a control signal pressure within a shuttle block and outputting it to operating equipment. SOLUTION: Shuttle valves 61-75 are built in a shuttle block 50, and the low pressure system of the shuttle valves is perfectly separated from the high pressure system of flow control valves 5-13 in order to generate and output a control signal pressure within the shuttle block 50. Thus, the valve block of a valve device 4 made of a high strength material can be miniaturized, the block body 60 of the shuttle block 50 which is the valve block of the shuttle valves 61-75 can be manufactured by use of an inexpensive material, and the manufacturing cost can be thus reduced as the whole. Further, since all of the shuttle valves 61-75 are built in one shuttle block 50, the piping between the shuttle valves is dispensed with, and the circuit structure can be simplified. Therefore, the assembling property of a hydraulic circuit device can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit device for a hydraulic working machine such as a hydraulic shovel, and more particularly, to a shuttle valve which controls a maximum pressure of a predetermined one of operation signal pressures generated by a plurality of pilot operation devices. The present invention relates to a hydraulic circuit device of a hydraulic working machine that detects and uses this maximum pressure as a control signal pressure to operate an operating device such as a regulator of a hydraulic pump.

[0002]

2. Description of the Related Art As an example of a hydraulic circuit device for detecting a maximum pressure of a predetermined one of operation signal pressures generated by a plurality of pilot operation devices by a shuttle valve and operating the operation device as a control signal pressure, Patent No. 25348
97 and JP-A-3-144024.

FIG. 9 shows a hydraulic circuit device described in Japanese Patent No. 2534897. This hydraulic circuit device includes a regulator that controls tilting of a hydraulic pump as an operating device that is operated by a control signal pressure.

That is, in FIG. 9, the pressure oil discharged from the variable displacement hydraulic pump 102 is supplied to the flow control valves 106 and 1.
07, 108 via the respective actuators 11
0, 111 and 112 are supplied and discharged. Actuator 11
Pilot operating devices 114, 115, and 116 are provided for 0, 111, and 112, respectively. These pilot operating devices have built-in pilot valves (pressure reducing valves), and pilot pumps are provided in accordance with the operating direction and amount of the operating lever. 1
An operation signal pressure is generated from the pressure at 04, and is applied to each of the flow control valves 106, 107, and 108. The highest pressure among the operation signal pressures of the pilot operation devices 114, 115, 116 is the shuttle valve 118, 11.
9, 120, 121 and 122, the maximum pressure is transmitted to the regulator 103 of the hydraulic pump 102 as a control signal pressure, and the displacement of the hydraulic pump 102, that is, the displacement is controlled by operating the regulator 103.

Further, the hydraulic circuit device described in Japanese Patent Application Laid-Open No. 3-144024 is provided with a merge / divide circuit switching valve of two hydraulic pumps as an operating device operated by a control signal pressure, and a maximum pressure of an operation signal pressure group. As a control signal pressure, a shuttle valve block and a pilot switching valve block are provided. In the shuttle valve block, the maximum pressure of each of a plurality of operation pressure signal groups among the operation pressure signals generated by the plurality of pilot operation devices is detected, and the highest pressure is guided to the pilot switching valve block. In the pilot switching valve block, one of the maximum pressures selected by the shuttle valve block is extracted by the shuttle valve and the pilot switching valve in the block, and the maximum pressure is guided to the merge / divide circuit switching valve as a control signal pressure. , The junction / shunt circuit switching valve is switched.

[0006]

As described above, in the conventional hydraulic circuit device, the maximum pressure of a predetermined operation signal pressure group among the operation signal pressures generated by the pilot operation device by using a large number of shuttle valves is determined. An operating device such as a regulator of a hydraulic pump is operated by using this as a control signal pressure. By the way, when actually assembling such a hydraulic circuit device, the arrangement position of the shuttle valve becomes a problem.

In the hydraulic circuit device described in Japanese Patent No. 2534897, the shuttle valves 118, 119, 1
20, 121 and 122 are connected to pilot operation devices 114 and 1
It is arranged near 15, 116 and connected by piping. However, when a large number of shuttle valves are actually arranged and configured in this way, not only a large space is required for installing the shuttle valves and the piping, but also the routing of the piping becomes complicated. Intersect.
For this reason, it is difficult to mount on an actual machine from the viewpoint of space, cost, and assemblability. In addition, since the pipe is long, pressure loss may occur, and a response delay may occur in the operation of the operating device.

Therefore, when the above-described shuttle valve is incorporated, a method is usually employed in which a valve block of the flow control valves 106, 107, and 108 is used and the shuttle valve is incorporated in the valve block.

However, the flow control valves 106, 107, 10
The hydraulic pressure handled by 8 is a high pressure with a maximum pressure of 350 kg / cm ² or more, so that the valve block of the flow control valve is made of a high-strength material that can sufficiently withstand such a high pressure. On the other hand, since the pressure handled by the shuttle valve is the pilot pressure, it is a low pressure of at most about 50 to 60 kg / cm ² . Therefore, if a shuttle valve is incorporated in such a valve block, the valve block made of a material for high pressure must be enlarged in spite of the low hydraulic pressure handled by the shuttle valve, which is extremely expensive. It will be.

In the hydraulic circuit device described in Japanese Patent Application Laid-Open No. 3-144024, since the shuttle valve block and the pilot switching valve block are provided separately from the valve block of the flow control valve, the above-mentioned problems hardly occur. Absent. However, in this prior art, two blocks, a shuttle valve block and a pilot switching valve block, are provided, and a shuttle signal is incorporated in each of these valve blocks to generate a control signal pressure from an operation signal pressure. And a pipe for connecting them is required, a large installation space is required, and the routing of the pipe becomes complicated, and the assembling property is deteriorated. In addition, a pipe connecting the two blocks is required, causing pressure loss,
A response delay may occur in the operation of the shunt circuit switching valve). That is, the problem of the conventional technique shown in FIG. 9 cannot be solved.

Further, in each of the above prior arts, since both the flow control valve and the operating device are operated with the operating signal pressure generated by the pilot operating device, the transmission line length of the operating signal pressure becomes long, and this long transmission is performed. The flow rate as the signal pressure is insufficient for the capacity of the pipeline, and there is a possibility that the operation of the operating device may have a response delay even in this point. Further, in this case, there is a possibility that a response delay occurs in switching the flow control valve.

A first object of the present invention is to provide a hydraulic circuit device having an operating device operated by a control signal pressure based on a maximum pressure detected by a shuttle valve, wherein a high-pressure system and a low-pressure system are separated from each other. An object of the present invention is to provide a hydraulic circuit device of a hydraulic working machine that is simplified, reduces manufacturing costs, and is excellent in assemblability.

[0013] A second object of the present invention is to provide a hydraulic circuit device having an operating device which operates by a control signal pressure based on the maximum pressure detected by a shuttle valve, to reduce a pressure loss at the time of transmitting the control signal pressure and to reduce a response loss. An object of the present invention is to provide a hydraulic circuit device of a hydraulic working machine that can operate an operation device well.

[0014] A third object of the present invention is to provide a hydraulic circuit device having an operating device operated by a control signal pressure based on the maximum pressure detected by a shuttle valve, without increasing the length of a transmission line of the operating signal pressure. An object of the present invention is to provide a hydraulic circuit device of a hydraulic working machine that can generate a control signal pressure and can operate both a flow control valve and an operating device with good response.

[0015]

[Means for Solving the Problems]

(1) In order to achieve the first and second objects, the present invention provides at least one hydraulic pump, a plurality of actuators, and a supply of hydraulic oil discharged from the hydraulic pump to the plurality of actuators. A plurality of flow control valves to be discharged, a pilot hydraulic source, a plurality of pilot operating devices for generating an operation signal pressure from the pressure of the pilot hydraulic source and switching the corresponding flow control valve, and a plurality of the pilot operating devices A plurality of shuttle valves for selecting a maximum pressure of a predetermined operation signal pressure group among the generated operation signal pressures, and generating a control signal pressure based on the maximum pressure selected by these shuttle valves; A hydraulic circuit of a hydraulic working machine that operates at least one operating device provided for any of a pump, an actuator, and a flow control valve In the device, the maximum pressure all of the plurality of shuttle valves is built in one shuttle block for selecting, generating said control signal pressure in the shuttle block, and outputs to the operation unit.

As described above, by incorporating a plurality of shuttle valves in the shuttle block and generating and outputting a control signal pressure in the shuttle block, the low-pressure system of the shuttle valve is completely separated from the high-pressure system of the flow control valve. In addition, the valve block of the flow control valve made of a high-strength material can be made small, and the shuttle block body, which is the valve block of the shuttle valve, can be made of an inexpensive material, so that the manufacturing cost as a whole can be reduced.

Further, since all the shuttle valves are incorporated in one shuttle block, piping between the shuttle valves is not required, and the circuit configuration can be simplified. Therefore, assemblability of the hydraulic circuit device is improved, pressure loss during signal pressure transmission can be minimized, and the operating device can be operated with good response.

(2) In order to achieve the third object, according to the present invention, in the above (1), the present invention operates based on the highest pressure selected by the plurality of shuttle valves, And a hydraulic switching valve for generating the control signal pressure from the pressure of the above. The hydraulic switching valve is further incorporated in the shuttle block.

By operating the hydraulic switching valve incorporated in the shuttle block at the maximum pressure selected by the shuttle valve to generate the control signal pressure from the pressure of the pilot hydraulic power source, the maximum pressure selected by the shuttle valve can be obtained. The operating signal pressure is only used for the actuator in a limited passage in the shuttle block, and the transmission line length of the operating signal pressure selected as the highest pressure by the shuttle valve is not so long, The corresponding flow control valve can be switched with good response. On the other hand, for the operating device, since the control signal pressure is generated from the pressure of the pilot hydraulic source by the hydraulic switching valve, the flow rate of the control signal pressure can be sufficiently secured,
The operating device can be operated with good response.

(3) Further, in order to achieve the above first and second objects, the present invention provides a method of manufacturing a vehicle, comprising the steps of: providing at least one hydraulic pump, a plurality of actuators, and a hydraulic oil discharged from the hydraulic pump; A plurality of flow control valves respectively supplying and discharging the actuators, a pilot hydraulic source, a plurality of pilot operating devices that generate an operation signal pressure from the pressure of the pilot hydraulic source and switch the corresponding flow control valve to operate, A plurality of shuttle valves for selecting the highest pressure of each of a plurality of operation signal pressure groups among the operation signal pressures generated by the pilot operation device,
Generating a plurality of control signal pressures based on a maximum pressure of a plurality of operation signal pressure groups selected by these shuttle valves;
In the hydraulic circuit device for a hydraulic working machine that operates a plurality of operating devices provided for any of the hydraulic pump, the actuator, and the flow control valve, a plurality of shuttles for selecting a maximum pressure of each of the plurality of operation signal pressure groups All of the valves are built in one shuttle block, and the plurality of control signal pressures are generated in the shuttle block and output to the plurality of controllers.

As described above, even when there are a plurality of operation signal pressure groups for selecting the highest pressure, all of the plurality of shuttle valves are built in one shuttle block, and control signal pressure is generated and output in the shuttle block. By doing
As described in the above (1), the low-pressure system of the shuttle valve is separated from the high-pressure system of the flow control valve, so that the manufacturing cost can be reduced and the circuit configuration can be simplified. In addition, the operating device can be operated with good response.

(4) In order to achieve the third object, according to the present invention, in the above (3), at least one of the plurality of operation signal pressure groups operates based on the maximum pressure. A hydraulic switching valve for generating a corresponding control signal pressure from the pressure of the pilot hydraulic source, and the plurality of hydraulic switching valves are further incorporated in the shuttle block.

Thus, as described in the above (2), the flow control valve and the operating device can be operated with good response.

(5) In the above (3), for example, the plurality of actuators include a swing motor that drives the upper swing body of a hydraulic shovel to rotate, and the plurality of operating devices are a swing brake that brakes the swing motor. The shuttle block outputs one of the plurality of control signal pressures to the swing brake device to switch the swing brake device to a non-operating position and release the brake to the swing motor.

Thus, when the turning brake device is employed as the operating device, as described in the above (3), the manufacturing cost can be reduced, the assemblability of the hydraulic circuit device is improved, and the turning brake device can respond. Can work well.

(6) In the above (3), for example, there are at least two hydraulic pumps, the plurality of actuators include left and right traveling motors for driving a lower traveling body of a hydraulic shovel, The operating device can be switched between a cutoff position in which the left and right traveling motors are independently connected to the two hydraulic pumps and a communication position in which the left and right traveling motors are connected in parallel to one of the two hydraulic pumps. The shuttle block outputs one of the plurality of control signal pressures to the traveling communication valve to switch the traveling communication valve to the communicating position, and the hydraulic oil discharged from the one hydraulic pump Flows into the left and right traveling motors.

Thus, when the traveling communication valve is used as the operating device, as described in (3) above, the manufacturing cost can be reduced, and the assemblability of the hydraulic circuit device can be improved.
In addition, the traveling communication valve can be operated with good response.

(7) Further, in the above (3), for example, the hydraulic pump is a variable displacement hydraulic pump,
The plurality of actuators include a regulator for controlling a capacity of the hydraulic pump, and the shuttle block outputs one of the plurality of control signal pressures to the regulator to operate the regulator, thereby controlling a capacity of the hydraulic pump. Control.

Thus, when the regulator of the hydraulic pump is adopted as the operating device, as described in the above (3), the manufacturing cost can be reduced, the assemblability of the hydraulic circuit device is improved, and the regulator is improved in response. Can be activated.

(8) In the above (3), preferably, the plurality of pilot operating devices are provided with a pair of pilot valves having a pair of pilot valves for selectively generating signal pressures for traveling rightward and rightward. An operating device, a traveling left operating device including a pair of pilot valves for selectively generating left forward and left reverse signal pressures, and a pair of selectively generating bucket cloud and bucket dump signal pressures. Bucket operating device with pilot valve, boom operating device with a pair of pilot valves for selectively generating boom raising and lowering signal pressure, and selectively generating signal pressure for arm cloud and arm dump Arm operating device provided with a pair of pilot valves for performing the swing operation, and a swing operating device provided with a pair of pilot valves for selectively generating the signal pressures of the swing right and the swing left. The shuttle block includes, as the plurality of shuttle valves, a first shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves of the traveling right operating device; and a pair of pilot valves of the traveling left operating device. A second shuttle valve for selecting the high pressure side of the signal pressure from the valve; a third shuttle valve for selecting the high pressure side of the signal pressure from the pair of pilot valves of the bucket operating device; and a pair of the boom operating device A fourth shuttle valve for selecting the high pressure side of the signal pressure from the pilot valve of the arm, and a fifth shuttle valve for selecting the high pressure side of the signal pressure from the pair of pilot valves of the arm operating device.
A shuttle valve, a sixth shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves of the turning operation device,
A seventh shuttle valve for selecting the high pressure side of the signal pressure selected by each of the fourth shuttle valve and the fifth shuttle valve; and a high pressure side of the signal pressure selected by each of the third shuttle valve and the seventh shuttle valve. An eighth shuttle valve to be selected, a ninth shuttle valve to select the high pressure side of the signal pressure selected by each of the seventh shuttle valve and the sixth shuttle valve, and each of the first shuttle valve and the eighth shuttle valve. A tenth shuttle valve that selects the high pressure side of the selected signal pressure and is one of the highest pressures of the plurality of operation signal pressure groups; and a high pressure side of the signal pressure selected by each of the second shuttle valve and the ninth shuttle valve. And selecting the high pressure side of the signal pressure selected by each of the eleventh shuttle valve and the ninth shuttle valve as the other one of the highest pressures of the plurality of operation signal pressure groups. A twelfth shuttle valve which is another one of the highest pressures of the plurality of operation signal pressure groups, and a first pump as one of the plurality of control signal pressures according to the highest pressure selected by the tenth shuttle valve; Generating a second pump control signal as one of the plurality of control signal pressures with the highest pressure selected by the eleventh shuttle valve; The pressure generates a front operation signal as yet another one of the plurality of control signal pressures.

By hierarchically connecting a plurality of shuttle valves in this manner, the operating pilot device includes a traveling right operating device, a traveling left operating device, a bucket operating device, a boom operating device, an arm operating device, and a turning operating device. In this case, the control signal pressure as the first pump control signal, the control signal pressure as the second pump control signal, and the control signal as the front operation signal are obtained from the operation signal pressures generated by these operation devices with the minimum number of shuttle valves. Pressure is obtained.

(9) In the above (8), preferably,
The shuttle block selects, as the plurality of shuttle valves, a high pressure side of the signal pressure selected by each of the first shuttle valve and the second shuttle valve, and further selects one of the highest pressures of the plurality of operation signal pressure groups. A thirteenth shuttle valve is further included, and a traveling operation signal is generated as still another one of the plurality of control signal pressures based on the highest pressure selected by the thirteenth shuttle valve.

Thus, as described in (8) above, the control signal pressure as the first pump control signal, the control signal pressure as the second pump control signal, and the control signal pressure as the front operation signal with the minimum number of shuttle valves. As well as the control signal pressure, a control signal pressure as a driving operation signal is also obtained.

[0034]

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiment, the present invention is applied to a hydraulic shovel as a hydraulic working machine.

First, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, a hydraulic circuit device according to the present embodiment comprises a main hydraulic pump 1a, 1b and a pilot pump 2a.
And an engine 3 for rotating these pumps 1a, 1b, 2 and a valve device 4 connected to the main hydraulic pumps 1a, 1b.
And The valve device 4 has two valve groups of flow control valves 5 to 8 and flow control valves 9 to 13, and the flow control valve 5
-8 are located on a center bypass line 15a connected to the discharge passage 14a of the main hydraulic pump 1a, and the flow control valves 9-1
Reference numeral 3 is located on a center bypass line 15b connected to the discharge passage 14b of the main hydraulic pump 1b.

The main hydraulic pumps 1a and 1b are swash plate type variable displacement pumps. These hydraulic pumps are provided with regulators 28a and 28b for controlling the tilt of the swash plate, that is, the pump capacity (displacement capacity).

A pilot relief valve 31 for maintaining the discharge pressure of the pilot pump 2 at a constant pressure is connected to the discharge path 30 of the pilot pump 2, and the pilot pump 2 and the pilot relief valve 31 constitute a pilot hydraulic pressure source.

The flow control valves 5 to 8 and 9 to 13 of the valve device 4
Is switched by an operation signal pressure from the pilot operation devices 35, 36, 37. Pilot operation device 3
5, 36 and 37 generate the respective operation signal pressures using the discharge pressure (constant pressure) of the pilot pump 2 as the original pressure.

The operating signal pressure generated by the pilot operating devices 35, 36, 37 is once introduced into the shuttle block 50, and through the shuttle block 50, the flow control valves 5 to 8 and 9 to 13 as shown in FIG. Given to. Further, in the shuttle block 50, the front operation signal Xf, the traveling operation signal Xt (see FIG. 5), the front operation signal Xf, and the operation signal pressure based on the operation signal pressure from the pilot operation devices 35, 36, and 37.
The pump control signals Xp1 and Xp2 are generated, and the front operation signal Xf and the pump control signals Xp1 and Xp2 are used as control signal pressures via the signal communication lines 51, 52 and 53 via the traveling communication valve 25 (described later) and the swing brake cylinder 26, respectively.
(Described later), it is output to the pump regulators 28a and 28b.

Further, the shuttle block 50 is provided with a pressure sensor 54 for detecting the traveling operation signal Xt, and the signal line 51 is provided with a pressure sensor 55 for detecting the front operation signal Xr. Is input to the controller 56. Controller 56
Generates an engine speed command signal based on the signals from the pressure sensors 54 and 55 and the signals from the engine speed setting dial 57 and the art idle switch 58, and outputs the signal to the governor 3a of the engine 3; Control.

FIG. 2 shows the details of the valve device 4. The flow control valves 5 to 8 and the flow control valves 9 to 13 are of a center bypass type, and the pressure oil discharged from the main hydraulic pumps 1a and 1b is supplied to the corresponding ones of the actuators 16 to 21 by these flow control valves. You. The actuator 16 is a hydraulic motor for traveling right (right traveling motor), and the actuator 1
7 is a hydraulic cylinder for the bucket (bucket cylinder),
The actuator 18 is a hydraulic motor for turning (swing motor), the actuator 19 is a hydraulic cylinder for arms (arm cylinder), the actuator 20 is a hydraulic cylinder for boom (boom cylinder), and the actuator 21
Is a hydraulic motor for traveling left (left traveling motor), the flow control valve 5 is for traveling right, the flow control valve 6 is for bucket, the flow control valve 7 is for first boom, and the flow control valve 8 is for second arm. The flow control valve 9 is for turning, the flow control valve 10 is for the first arm, the flow control valve 11 is for the second boom, the flow control valve 12
Is for standby and the flow control valve 13 is for traveling left. That is, for the boom cylinder 20, two flow control valves 7, 11
The arm cylinder 19 is also provided with two flow control valves 8 and 10, and the boom cylinder 20 and the arm cylinder 19 are each provided with two hydraulic pumps 1 and 2.
Pressure oils from a and 1b are combined and supplied.

The flow control valve 5 for the right side of traveling has flow control valves 6 to
8 is connected in tandem (priority connection) to the upstream side, and the flow control valves 6, 7, 8 are connected in parallel by a bypass line 22. The flow control valves 9 to 12 are connected in tandem upstream with respect to the flow control valve 13 for traveling left (priority connection).
The flow control valves 9 to 12 are connected in parallel by a bypass line 23.

The input port of the flow control valve 5 for the right side of travel and the input port of the flow control valve 13 for the left side of travel are connected to a communication line 24.
The communication line 24 is provided with the traveling communication valve 25 described above. The traveling communication valve 25 can be switched between a shut-off position and a communication position. When the shuttle block 50 does not supply the front operation signal Xf (control signal pressure) to the pressure receiving portion 25a, the travel communication valve 25 is in the cut-off position shown in FIG. In the cutoff position, the left and right traveling motors 16, 21
Are independently connected to the main hydraulic pumps 1a and 1b, respectively.
The front operation signal Xf (control signal pressure) is transmitted to the pressure receiving section 25a.
Is switched to the communication position, and the left and right traveling motors 16 and 21 are connected in parallel to the main hydraulic pump 1a in this communication position.

The output shaft of the swing motor 18 is provided with the above-described brake cylinder 26. This brake cylinder 26 is in an operating state when the front operation signal Xf (control signal pressure) is not given from the shuttle block 50, and applies a brake to the swing motor 18 to give the front operation signal Xf (control signal pressure). Then, the switch is switched to the inoperative position, and the brake on the swing motor 18 is released.

FIG. 3 shows the appearance of a hydraulic shovel on which the hydraulic circuit device of the present invention is mounted. The hydraulic shovel has a lower traveling structure 100, an upper revolving structure 101, and a work front 102. Left and right traveling motors 16 and 21 are disposed on the lower traveling body 100. The traveling motors 16 and 21 rotate the crawler 100a to travel forward or backward. A swing motor 18 is mounted on the upper swing body 101, and the swing motor 18 causes the upper swing body 101 to swing rightward or leftward with respect to the lower traveling body 100.
The work front 102 includes a boom 103, an arm 104, and a bucket 105. The boom 103 is moved up and down by a boom cylinder 19, and the arm 104 is operated by the arm cylinder 19 to a dump side (open side) or a cloud side (scraping side). The bucket 105 is operated by the bucket cylinder 17 on the dump side (open side) or the cloud side (scraping side).

FIG. 4 shows details of the pilot operation devices 35, 36 and 37.

The pilot operating device 35 comprises a pilot operating device 38 for traveling right and a pilot operating device 39 for traveling left, and a pair of pilot valves (pressure reducing valves) 38a, 38b and 39a, 39b and the operating pedal 3 respectively.
8c, 39c, and when the operation pedal 38c is operated in the front-rear direction, the pilot valves 38a,
38b is operated, an operation signal pressure Af or Ar corresponding to the operation amount is generated, and when the operation pedal 39c is operated in the front-back direction, one of the pilot valves 39a, 39b is operated according to the operation direction. Then, an operation signal pressure Bf or Br corresponding to the operation amount is generated. The operation signal pressure Af is for traveling right forward, the operation signal pressure Ar is for traveling right backward, the operation signal pressure Bf is for traveling left forward, and the operation signal pressure Br is for traveling left backward.

The pilot operating device 36 comprises a bucket pilot operating device 40 and a boom pilot operating device 41, each of which has a common operating lever with a pair of pilot valves (pressure reducing valves) 40a, 40b and 41a, 41b. When the operation lever 40c is operated in the left-right direction, the pilot valve 40a,
Either one of the pilot valves 41a and 41b is operated in accordance with the operation direction when one of the pilot valves 41a and 41b is operated, and the operation signal pressure Cc or Cd is generated according to the operation amount. Then, the operation signal pressure Du or Dd according to the operation amount is generated. The operation signal pressure Cc is for the bucket cloud, and the operation signal pressure Cd
Is for bucket dumping, the operation signal pressure Du is for raising the boom, and the operation signal pressure Dd is for lowering the boom.

The pilot operating device 37 comprises a pilot operating device 42 for the arm and a pilot operating device 43 for turning, and each has a common operating lever shared by a pair of pilot valves (pressure reducing valves) 42a, 42b and 43a, 43b. When the operation lever 42c is operated in the left-right direction, the pilot valves 42a, 4
2b is operated, an operation signal pressure Ec or Ed corresponding to the operation amount is generated, and when the operation lever 42c is operated in the front-back direction, the pilot valve 4c is operated according to the operation direction.
One of 3a and 43b is activated, and operation signal pressures Fr and Fl corresponding to the operation amount are generated. Operation signal pressure E
c is for the arm cloud, the operation signal pressure Ed is for the arm dump, the operation signal pressure Fr is for the right turn, and the operation signal pressure Fl is for the left turn.

The details of the shuttle block 50 are shown in FIG.

In FIG. 5, the shuttle block 50 includes
A block main body 60 and shuttle valves 61 to 75 incorporated in the block main body 60 are provided.

The shuttle valves 61 to 67 are arranged at the uppermost stage of the shuttle valve group, and the shuttle valve 61 selects the high pressure side of the operation signal pressure Af for traveling right forward and the operation signal pressure Ar for traveling right reverse, and the shuttle valve 62. Is the operation signal pressure B for traveling left forward
f and the high pressure side of the operation signal pressure Br for traveling left backward,
Shuttle valve 63 operates bucket cloud operating signal pressure Cc.
And the high pressure side of the bucket dump operation signal pressure Cd, the shuttle valve 64 selects the boom raising operation signal pressure Du and the high pressure side of the boom lowering operation signal pressure Dd, and the shuttle valve 65 selects the arm cloud operation signal pressure. The high pressure side of the pressure Ec and the operation signal pressure Ed of the arm dump is selected, the shuttle valve 66 selects the high pressure side of the turning right operation signal pressure Fr and the high pressure side of the turning left operation signal pressure Fl, and the shuttle valve 67 The high pressure side of the operating signal pressure from a pair of pilot valves of the spare pilot operating device provided when the actuator is connected to the spare flow control valve 12 is selected.

The shuttle valves 68 to 70 correspond to the shuttle valve group 2
The shuttle valve 68 is disposed at the uppermost stage, and the shuttle valve 68 selects the high pressure side of the operation signal pressure selected by each of the uppermost shuttle valve 61 and the shuttle valve 62, and the shuttle valve 69 selects the uppermost shuttle valve 64 and the shuttle valve 65. The high pressure side of the operation signal pressure selected in each case is selected, and the shuttle valve 70 selects the high pressure side of the operation signal pressure selected in each of the uppermost shuttle valve 66 and the shuttle valve 67.

The shuttle valves 71 and 72 correspond to the shuttle valve group 3
The shuttle valve 71 is disposed at the upper stage, and the shuttle valve 71 selects the high pressure side of the operation signal pressure selected by each of the shuttle valve 63 at the uppermost stage and the shuttle valve 69 at the second stage. And the high-pressure side of the operation signal pressure selected by the shuttle valve 70.

The shuttle valves 73 and 74 correspond to the shuttle valve group 4.
The shuttle valve 73 is disposed at the upper stage, and the shuttle valve 73 selects the high pressure side of the operation signal pressure selected by the uppermost shuttle valve 61 and the third stage shuttle valve 71, respectively. And the shuttle valve 72 selects the higher pressure side of the selected operation signal pressure.

The shuttle valve 75 is arranged at the lowermost stage (fifth stage), and has the uppermost shuttle valve 62 and the third stage shuttle valve 7.
2 selects the high pressure side of the operation signal pressure selected.

The operation signal pressure selected by the shuttle valve 68 is detected by the pressure sensor 54 as a traveling operation signal Xt (control signal pressure), and the operation signal pressure selected by the shuttle valve 74 is determined by the front operation signal Xf (control signal pressure). ) Is output to the travel communication valve 25 and the turning brake cylinder 26, and is detected by the pressure sensor 55. The operation signal pressure selected by the shuttle valve 73 is the pump control signal Xp
1 (control signal pressure) is output to the regulator 28a of the main hydraulic pump 1a, and the operation signal pressure selected by the shuttle valve 75 is output as a pump control signal Xp2 (control signal pressure) to the regulator 28b of the main hydraulic pump 1b. .

By arranging and connecting the shuttle valves 61 to 75 in a hierarchical manner from the uppermost stage to the fifth stage as described above,
Pilot operating device 38 for running right, pilot operating device 39 for running left, pilot operating device 4 for bucket
0, pilot operating device 41 for boom, pilot operating device 42 for arm, pilot operating device 4 for turning
3 as the control signal pressure, the traveling operation signal Xt, the front operation signal Xf, the pump control signal Xp1,
When generating Xp2, the number of shuttle valves 61-75 can be minimized.

In the present embodiment configured as described above, at least one of the pilot operating device 38 for traveling right, the pilot operating device 40 for bucket, the pilot operating device 41 for boom, and the pilot operating device 42 for arm is provided. When one of them is operated, the corresponding operation signal pressure is given to the corresponding one of the flow control valves 5 to 8, and when there is one operation signal pressure, the operation signal pressure is The highest pressure among the operation signal pressures is the shuttle valve 61, 63, 64, 65, 69, 71,
73 and is output to the regulator 28a of the main hydraulic pump 1a as a pump control signal Xp1. The regulator 28a has a characteristic of increasing the tilt of the main hydraulic pump 1a as the pressure of the pump control signal Xp1 increases. When the pump control signal Xp1 is applied, the discharge flow rate of the main hydraulic pump 1a increases. Let it. As a result, the flow control valve corresponding to the operation signal pressure is switched, and at the same time, hydraulic oil having a flow rate corresponding to the operation signal pressure (the operation amount of the pilot operation device) is discharged from the main hydraulic pump 1a, and the actuators 16, 17, 19 , 20 to drive these actuators.

When at least one of the pilot operation device 39 for traveling left, the pilot operation device 41 for boom, the pilot operation device 42 for arm, and the pilot operation device 43 for turning is operated, the corresponding operation signal pressure is changed to the flow rate. The control signal is given to the corresponding one of the control valves 9, 10, 11, and 13. When there is one operation signal pressure, the operation signal pressure is given. When there are a plurality of operation signal pressures, the highest pressure among the operation signal pressures is given. Are shuttle valves 62, 64, 65,
66, 69, 70, 72, and 75 are output to the regulator 28b of the main hydraulic pump 1b as a pump control signal Xp2. The regulator 28b also controls the main hydraulic pump 1b as the pressure of the pump control signal Xp2 increases.
When the pump control signal Xp2 is provided, the discharge flow rate of the main hydraulic pump 1b is increased accordingly. As a result, the flow control valve corresponding to the operation signal pressure is switched, and at the same time, the main hydraulic pump 1b discharges pressure oil having a flow rate corresponding to the operation signal pressure (the operation amount of the pilot operation device).
8, 19, 20, and 21, and the actuators are driven.

When at least one of the pilot operating device 40 for the bucket, the pilot operating device 41 for the boom, the pilot operating device 42 for the arm, and the pilot operating device 43 for turning is operated, the corresponding operation signal pressure is increased. The control signals are provided to the corresponding ones of the control valves 6, 7, 8, and 9, 10, 11, and when one operation signal pressure is provided, the operation signal pressure is provided. The highest pressure is the shuttle valve 63,6
4, 65, 66, 69, 70, 71, 72, 74, and is output to the turning brake cylinder 26 as a front operation signal Xf. Thereby, the actuator 1
The corresponding ones of 7, 18, 19, and 20 are driven as described above, and the braking of the brake cylinder 26 is released. Therefore, when the turning pilot operating device 43 is operated, the turning motor 18 can be turned, and any one of the bucket pilot operating device 40, the boom pilot operating device 41, and the arm pilot operating device 42 can be used. Is operated, the work front 1
Even if a turning force acts on the turntable with the operation reaction force of 02,
Since the brake of the swing motor 18 is released, a load is prevented from being applied to a speed reducer (not shown) provided between the swing motor 18 and the swing ring.

Further, the pilot operating device 3 for the traveling right
8. When the pilot left operating device 39 is operated, the pilot operating device 40 for the bucket, the pilot operating device 41 for the boom, the pilot operating device 42 for the arm, When at least one of the turning pilot operation devices 43 is operated, the respective operation signal pressures are applied to the flow control valves 5, 1.
3 and the flow control valves 6, 7, 8 and 9, 10, 11 corresponding to the pilot operation device 40 for the bucket, the pilot operation device 41 for the boom, the pilot operation device 42 for the arm, Of the operating signal pressures from the pilot operating device 43 for the shuttle valves 63, 64, 65, 66, 69, 70, 71,
The signals are selected by 72 and 74 and output to the travel communication valve 25 as a front operation signal Xf. As a result, the traveling communication valve 25 is switched from the illustrated shut-off position to the communication position, and the pressure oil discharged from the main hydraulic pump 1a flows into not only the flow control valve 5 but also the flow control valve 13. For this reason, even if the flow control valves 9, 10, 11 on the upstream side of the flow control valve 13 are switched, and the hydraulic oil discharged from the main hydraulic pump 1b is supplied to these flow control valves preferentially, the main hydraulic pressure is not changed. The pressure oil from the pump 1a can be supplied to both the traveling motors 16 and 21, and the combined traveling / front operation can be performed by using the main hydraulic pump 1a exclusively for traveling.

Further, all the pilot operating devices (the pilot operating device 38 for the traveling right, the pilot operating device 39 for the traveling left, the pilot operating device 40 for the bucket, the pilot operating device 41 for the boom, and the pilot operating device for the arm 42, when at least one of the turning pilot operating devices 43) is operated, the corresponding operating signal pressure is applied to the corresponding one of the flow control valves 5 to 11, 13 and the traveling right pilot operating device 38 is operated. When at least one of the pilot operation devices 39 for traveling left is operated, the highest pressure among those operation signal pressures is selected by the shuttle valves 61, 62, 68 and detected by the pressure sensor 54 as the traveling operation signal Xt. The pilot operation device 40 for the bucket, the pilot operation device 41 for the boom, and the arm When at least one of the pilot operation device 42 and the turning pilot operation device 43 is operated, the highest pressure among the operation signal pressures is output as the front operation signal Xf as described above, and the pressure sensor 55 The detected signals from the pressure sensors 54 and 55 are supplied to the controller 56.

When the art idle switch 58 is OFF, the controller 56 generates an engine speed command signal based on a signal from the engine speed setting dial 57 and outputs the signal to the governor 3a of the engine 3 to thereby output the engine speed. 3 is controlled so as to reach the target rotation speed set by the rotation speed setting dial 57. When the art idle switch 58 is ON, the driving operation signal X
When t or the front operation signal Xf is detected by the pressure sensors 54 and 55, the art idle switch 58 is turned off.
As in the case of F, the rotation speed of the engine 3 is controlled so as to reach the target rotation speed set by the rotation speed setting dial 57.
On the other hand, when the art idle switch 58 is ON and neither the traveling operation signal Xt nor the front operation signal Xf is detected by the pressure sensors 54 and 55, that is, when none of the pilot operation devices is operated, the controller 56 rotates. An idle command signal is output as the engine speed command signal regardless of the setting state of the number setting dial 57, and the engine 3 is controlled so that the speed of the engine 3 becomes a predetermined low speed. Thus, during a neutral state in which none of the actuators is operated, the number of revolutions of the engine 3 is automatically reduced to a predetermined low number of revolutions, thereby enabling economical operation.

As described above, according to the present embodiment, the necessary control signal pressure is generated using the operation signal pressure in the shuttle block 50, and the regulators 28a and 28b of the main hydraulic pumps 1a and 1b, the swing brake cylinder 26 The operating devices such as the travel communication valve 25 and the governor 3a of the engine 3 can be operated.

Further, according to the present embodiment, the shuttle valve 6
1 to 75 are built in the shuttle block 50, and the control signal pressure is generated and output in the shuttle block 50. Therefore, the low pressure system (pilot system) of the shuttle valve is completely separated from the high pressure system of the flow control valves 5 to 13. In addition, the valve block of the valve device 4 made of a high-strength material can be made small, and the block body 60 of the shuttle block 50, which is the valve block of the shuttle valves 61 to 75, can be made of an inexpensive material. Can be reduced.

Further, since all of the shuttle valves 61 to 75 are incorporated in one shuttle block 50, piping between the shuttle valves becomes unnecessary, and the circuit configuration can be simplified. For this reason, the assemblability of the hydraulic circuit device is improved, and the pressure loss at the time of transmitting the signal pressure can be minimized. Can be activated.

Further, according to the present embodiment, the shuttle valves 61 to 75 are hierarchically arranged and connected in the shuttle block 50 from the uppermost stage to the fifth stage. A traveling operation signal as a control signal pressure is obtained from the operation signal pressure of the pilot operation device 39 for the left, the pilot operation device 40 for the bucket, the pilot operation device 41 for the boom, the pilot operation device 42 for the arm, and the pilot operation device 43 for turning. When generating Xt, the front operation signal Xf, and the pump control signals Xp1 and Xp2, the number of shuttle valves 61 to 75 can be minimized. Therefore, the shuttle block 50 can be made compact and the manufacturing cost can be reduced.

A second embodiment of the present invention will be described with reference to FIG. In the figure, the same components as those shown in FIG. 5 are denoted by the same reference numerals. In the present embodiment, a part of the control signal pressure is generated by the hydraulic switching valve in the shuttle block.

That is, in FIG.
0A is a shuttle valve 61 built in the block main body 60.
75, and a hydraulic switching valve 80 is provided. The shuttle valves 61 to 75 are the same as those of the first embodiment.

The hydraulic pressure switching valve 80 is a valve that guides the maximum pressure selected by the shuttle valve 74 to the pressure receiving section 80, operates based on the maximum pressure, and generates a control signal pressure from the pressure of the pilot pump 2. When the maximum pressure selected by the shuttle valve 74 is the tank pressure, the hydraulic switching valve 80 is at the position shown in the drawing. The control signal pressure is reduced to the tank pressure, and the maximum pressure selected by the shuttle valve 74 is the tank pressure. At this point, the position is switched from the position shown in the figure, the pressure of the pilot pump 2 is output as a control signal pressure, and the swing brake cylinder 26 and the traveling communication valve 25 are operated by this control signal pressure.

In the present embodiment configured as described above, the operation signal pressure as the maximum pressure selected by the shuttle valve 74 is applied to the swing brake cylinder 26 and the travel communication valve 25 which are the operation devices in the shuttle block 50A. Only used in a limited passage, the transmission line length of the operation signal pressure selected as the maximum pressure by the shuttle valve 74 is not so long, and the corresponding flow control valve can be switched with good response. On the other hand, the hydraulic switching valve 80
As a result, the control signal pressure is generated from the pressure of the pilot hydraulic pressure source, so that the flow rate of the control signal pressure can be sufficiently ensured, and the swing brake cylinder 26 and the traveling communication valve 25 can be operated with good response.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the switching between the swing brake cylinder 26 and the traveling communication valve 25 can be performed more responsively. In this case, the release speed of the swing brake is improved, the brake can be reliably released before the swing motor 18 and the like are started, and the travel communication valve 25 can be reliably switched to the communication position before the start of travel to improve travel straightness. Can be improved. Further, since the flow control valve can be switched with good response, smooth operability of the entire hydraulic circuit device can be obtained.

A third embodiment of the present invention will be described with reference to FIG. In the figure, the same components as those shown in FIG. 5 are denoted by the same reference numerals. In this embodiment, a part of the control signal pressure is generated by the hydraulic switching valve in the shuttle block.

That is, in FIG.
0B is a shuttle valve 61 built in the block main body 60.
75, and hydraulic pressure switching valves 81 and 82 are provided. The shuttle valves 61 to 75 are the same as those of the first embodiment.

The hydraulic pressure switching valve 81 is a proportional pressure reducing valve that generates the control signal pressure from the pressure of the pilot pump 2 by operating based on the maximum pressure selected by the shuttle valve 73 and guided to the pressure receiving portion 81a. is there. This hydraulic switching valve 81
Operates according to the maximum pressure level selected by the shuttle valve 73, reduces the pressure of the pilot pump 2 to a control signal pressure corresponding to the maximum pressure level, and outputs the control signal pressure. The regulator 28a of the main hydraulic pump 1a Is activated by this control signal pressure.

The hydraulic pressure switching valve 82 is a proportional pressure-reducing valve that operates based on the maximum pressure selected by the shuttle valve 75 and guided to the pressure receiving portion 82a and generates a control signal pressure from the pressure of the pilot pump 2. is there. This hydraulic switching valve 82
Operates in accordance with the maximum pressure level selected by the shuttle valve 75, reduces the pressure of the pilot pump 2 to a control signal pressure corresponding to the maximum pressure level, and outputs the control signal pressure. The regulator 28b of the main hydraulic pump 1b Is activated by this control signal pressure.

Even in the present embodiment configured as described above, the operating signal pressure as the maximum pressure selected by the shuttle valves 73 and 75 is controlled by the regulators 28a and 2 which are operating devices.
8b is used only in a limited passage in the shuttle block 50B, and the transmission line length of the operation signal pressure selected as the highest pressure by the shuttle valves 73 and 75 is not so long, and is not correspondingly increased. The flow control valve can be switched with good response. On the other hand, for the regulators 28a and 28b, which are operating devices, the control signal pressure is generated from the pressure of the pilot hydraulic pressure source by the hydraulic switching valves 81 and 82, so that the flow rate of the control signal pressure can be sufficiently secured, and the regulator 28a, 28b can be operated with good response.

Therefore, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the regulator 28
a, 28b can be operated with good response, so that the discharge flow rate of the main hydraulic pumps 1a, 1b can be increased or decreased quickly with respect to the operation of the operation pilot device. Further, since the flow control valve can be switched with good response, smooth operability of the entire hydraulic circuit device can be obtained.

A fourth embodiment of the present invention will be described with reference to FIG. In the drawings, the same reference numerals are given to the same components as those shown in FIGS. This embodiment is a combination of the second embodiment and the third embodiment.

That is, in FIG.
0C is a shuttle valve 61 built in the block main body 60.
75, and hydraulic switching valves 80, 81, 82. The shuttle valves 61 to 75 are the same as those of the first embodiment, the hydraulic switching valve 80 is the same as that of the second embodiment, and the hydraulic switching valves 81 and 82 are the same as those of the third embodiment. Is the same.

According to the present embodiment, all effects of the first, second, and third embodiments can be obtained.

In the above embodiment, the swing brake cylinder, the traveling communication valve, the pump regulator, and the engine governor have been described as operating devices. However, the present invention is similarly applied to other operating devices, and the same applies. The effect of is obtained.

[0085]

According to the present invention, in a hydraulic circuit device having an operating device operated by a control signal pressure based on a maximum pressure detected by a shuttle valve, a circuit configuration is simplified by separating a high-pressure system and a low-pressure system. The manufacturing cost can be reduced, and the assemblability can be improved. Further, it is possible to reduce the pressure loss at the time of transmitting the control signal pressure, to operate the operating device without delay in response, and to obtain smooth operability of the operating device.

Further, according to the present invention, in a hydraulic circuit device provided with an operating device operated by a control signal pressure based on a maximum pressure detected by a shuttle valve, a transmission pipe length of the operation signal pressure is not increased so much. Can generate control signal pressure,
Both the flow control valve and the operating device can be operated without a response delay, and smooth operability of the entire hydraulic circuit device can be obtained.

Further, according to the present invention, since a plurality of shuttle valves are hierarchically connected in the shuttle block, the required control signal pressure can be obtained with the minimum number of shuttle valves, and the shuttle block can be made compact and low cost. Is possible.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing a hydraulic circuit device of a hydraulic working machine according to a first embodiment of the present invention.

FIG. 2 is a diagram showing details of a valve device of the hydraulic circuit device shown in FIG.

FIG. 3 is a diagram showing details of a pilot operation device shown in FIG. 1;

FIG. 4 is a view showing the appearance of a hydraulic shovel as a typical example of a hydraulic working machine to which the present invention is applied.

FIG. 5 is a diagram showing details of a shuttle block shown in FIG. 1;

FIG. 6 is a view showing details of a shuttle block in a hydraulic circuit device of a hydraulic working machine according to a second embodiment of the present invention.

FIG. 7 is a diagram showing details of a shuttle block in a hydraulic circuit device of a hydraulic working machine according to a third embodiment of the present invention.

FIG. 8 is a diagram showing details of a shuttle block in a hydraulic circuit device of a hydraulic working machine according to a fourth embodiment of the present invention.

FIG. 9 is a hydraulic circuit diagram showing a hydraulic circuit device of a conventional hydraulic working machine.

[Explanation of symbols]

 1a, 1b Main hydraulic pump 2 Pilot pump 3 Prime motor 3a Governor (operator) 4 Valve device 5-13 Flow control valve 16, 21 Travel motor 18 Swing motor 25 Travel communication valve (operator) 26 Swivel brake cylinder (operator) 28a, 28b Regulator (operator) 35-37 Pilot operating device 38-43 Pilot operating device 61-75 Shuttle valve 80, 81, 82 Hydraulic switching valve

Continuing on the front page (72) Inventor Kazunori Nakamura 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (72) Inventor Koji Ishikawa 650, Kandamachi-cho, Tsuchiura-shi, Ibaraki Prefecture Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant (72) Inventor Takeshi Nakamura 650, Kandamachi, Tsuchiura City, Ibaraki Prefecture Inside the Tsuchiura Plant Hitachi Construction Machinery Co., Ltd.

Claims (9)

[Claims] At least one hydraulic pump, a plurality of actuators, a plurality of flow control valves for supplying and discharging pressure oil discharged from the hydraulic pump to each of the plurality of actuators, a pilot hydraulic source, A plurality of pilot operating devices that generate an operating signal pressure from the pressure of the hydraulic source and switch the corresponding flow control valve, and a predetermined operating signal pressure group among the operating signal pressures generated by the plurality of pilot operating devices. A plurality of shuttle valves for selecting a maximum pressure, generating a control signal pressure based on the maximum pressure selected by the shuttle valves,
In a hydraulic circuit device for a hydraulic working machine that operates at least one operating device provided for any of the hydraulic pump, the actuator, and the flow control valve, all of the plurality of shuttle valves for selecting the maximum pressure may be replaced by one shuttle block. Wherein the control signal pressure is generated in the shuttle block and output to the operating device. 2. The hydraulic circuit device for a hydraulic working machine according to claim 1, wherein the control signal pressure is generated based on a pressure of the pilot hydraulic source by operating based on a maximum pressure selected by the plurality of shuttle valves. A hydraulic circuit device for a hydraulic working machine, further comprising a hydraulic switching valve, wherein the hydraulic switching valve is further incorporated in the shuttle block. 3. A hydraulic pump, a plurality of actuators, a plurality of flow control valves for supplying and discharging pressure oil discharged from the hydraulic pump to the plurality of actuators, a pilot hydraulic power source, and a pilot hydraulic pressure source. A plurality of pilot operating devices that generate an operating signal pressure from the pressure of the hydraulic source and switch the corresponding flow control valve, and a plurality of operating signal pressure groups among the operating signal pressures generated by the plurality of pilot operating devices. A plurality of shuttle valves for selecting the respective maximum pressures, and generating a plurality of control signal pressures based on the respective maximum pressures of a plurality of operation signal pressure groups selected by the shuttle valves; , A hydraulic circuit device of a hydraulic working machine that operates a plurality of operating devices provided for any of the flow control valves In the above, all of the plurality of shuttle valves for selecting the maximum pressure of each of the plurality of operation signal pressure groups are built in one shuttle block, and the plurality of control signal pressures are generated in the shuttle block. A hydraulic circuit device for a hydraulic working machine, wherein the hydraulic circuit device outputs the signals to respective operating devices. 4. A hydraulic circuit device for a hydraulic working machine according to claim 3, wherein at least one of said plurality of operation signal pressure groups is operated based on a maximum pressure thereof and responds from a pressure of said pilot hydraulic pressure source. A hydraulic circuit device for a hydraulic working machine, further comprising a hydraulic switching valve for generating a control signal pressure, wherein the hydraulic switching valve is further incorporated in the shuttle block. 5. The hydraulic circuit device for a hydraulic working machine according to claim 3, wherein said plurality of actuators include a turning motor for rotatingly driving an upper turning body of a hydraulic shovel, and said plurality of operating devices brake said turning motor. The shuttle block outputs one of the plurality of control signal pressures to the swing brake device to switch the swing brake device to a non-operating position and release the brake to the swing motor. A hydraulic circuit device for a hydraulic working machine, characterized in that: 6. A hydraulic circuit device for a hydraulic working machine according to claim 3, wherein said hydraulic pump includes at least two hydraulic pumps, and said plurality of actuators include left and right traveling motors for driving a lower traveling body of a hydraulic shovel, The plurality of operating devices are provided in a cut-off position where the left and right traveling motors are independently connected to the two hydraulic pumps, and a communication position where the left and right traveling motors are connected in parallel to one of the two hydraulic pumps. A switchable travel communication valve, wherein the shuttle block outputs one of the plurality of control signal pressures to the travel communication valve to switch the travel communication valve to a communication position, and is discharged from the one hydraulic pump. A hydraulic circuit device for a hydraulic working machine, characterized in that the pressurized oil flows into the left and right traveling motors. 7. The hydraulic circuit device for a hydraulic working machine according to claim 3, wherein the hydraulic pump is a variable displacement hydraulic pump, and the plurality of operating devices include a regulator for controlling a displacement of the hydraulic pump; The hydraulic circuit device for a hydraulic working machine, wherein the shuttle block outputs one of the plurality of control signal pressures to the regulator to operate the regulator to control the capacity of the hydraulic pump. 8. The hydraulic circuit device for a hydraulic working machine according to claim 3, wherein said plurality of pilot operating devices include a pair of pilot valves for selectively generating signal pressures for traveling rightward and rightward. A traveling right operating device, a traveling left operating device equipped with a pair of pilot valves for selectively generating a traveling left forward signal and a left backward signal pressure, and selectively generating a bucket cloud and a bucket dump signal pressure 1 A bucket operating device having a pair of pilot valves, a boom operating device having a pair of pilot valves for selectively generating boom raising and lowering signal pressures, and selectively controlling a signal pressure of an arm cloud and an arm dump. An arm operating device provided with a pair of pilot valves for generating a turning signal, and a turning operating device provided with a pair of pilot valves for selectively generating a turning right and a turning left signal pressure. The shuttle block includes, as the plurality of shuttle valves, a first shuttle valve that selects a high pressure side of a signal pressure from a pair of pilot valves of the traveling right operation device, and a pair of the traveling left operation device. A second shuttle valve for selecting a high pressure side of a signal pressure from a pilot valve of the bucket operating device; a third shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves of the bucket operating device; A fourth shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves; a fifth shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves of the arm operating device; A sixth shuttle valve for selecting a high pressure side of a signal pressure from a pair of pilot valves of the apparatus; and a high pressure side of a signal pressure selected by each of the fourth shuttle valve and the fifth shuttle valve. A seventh shuttle valve, an eighth shuttle valve for selecting the high pressure side of the signal pressure selected by each of the third shuttle valve and the seventh shuttle valve, and a selection by each of the seventh shuttle valve and the sixth shuttle valve. A ninth shuttle valve for selecting the high pressure side of the signal pressure, and the first shuttle valve and the eighth shuttle valve.
The tenth shuttle valve, which selects the high pressure side of the signal pressure selected by each of the shuttle valves and is one of the highest pressures of the plurality of operation signal pressure groups, and the second shuttle valve and the ninth shuttle valve, respectively. An eleventh shuttle valve that selects the high pressure side of the signal pressure and makes it the other of the highest pressures of the plurality of operation signal pressure groups; and a high pressure side of the signal pressure selected by each of the eighth shuttle valve and the ninth shuttle valve. And a twelfth shuttle valve for selecting one of the maximum pressures of the plurality of operation signal pressure groups and incorporating one of the plurality of control signal pressures according to the maximum pressure selected by the tenth shuttle valve.
Generating a second pump control signal as another one of the plurality of control signal pressures according to the highest pressure selected by the eleventh shuttle valve; A hydraulic circuit device for a hydraulic working machine, wherein a front operation signal is generated as still another one of the plurality of control signal pressures according to a maximum pressure selected by a valve. 9. The hydraulic circuit device for a hydraulic working machine according to claim 8, wherein the shuttle block serves as the plurality of shuttle valves and has a high signal pressure selected by each of the first shuttle valve and the second shuttle valve. A thirteenth shuttle valve for selecting a side of the plurality of operation signal pressure groups to be another one of the highest pressures of the plurality of operation signal pressure groups; A hydraulic circuit device for a hydraulic working machine according to another embodiment, which generates a traveling operation signal.