JP2001213198A - Display device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device of a construction machine displaying a position of a front work machine and capable of corresponding to a failure and changes of specifications easily at a low cost when the failure occurs and the specification are changed and improving the operation property as the display device. SOLUTION: This display device consisting of a display part displaying a position of the front work machine, an operation part switching and operating display contents to be displayed in the display part, and a control part for display controlling display contents to be displayed in the display part in accordance with switching operation of the operation part is not integrally constituted, but is constituted by dividing it into each unit of a display device 41, a control unit for display 42, and an operation device 43. Consequently for any unit failure and changed in specification it is not necessary to replace the whole display device. It is possible to cope with them by the replacement and change of the unit. Each unit constituted independently is arranged in proper section in a driver's cab, thereby allowing to confirm display and switch display contents easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a construction machine, which is provided in a cab of a construction machine and displays position information of a front working machine such as a tip position of a bucket.

[0002]

2. Description of the Related Art A typical example of a construction machine is a hydraulic shovel. In this hydraulic shovel, an operator operates a front member such as a boom, which is a component member of the front working machine, with a manual operating lever. It is difficult to judge whether or not a trench having a predetermined depth or a slope having a predetermined gradient is accurately excavated only by visually observing the operation of (1).

Therefore, in a hydraulic excavator, US Pat. No. 5,887,3 discloses a system for displaying position information and the like of a bucket, which is a working tool located at the tip of a front working machine.
There is an EX-200X level master monitor device manufactured by Hitachi Construction Machinery Co., Ltd. shown in FIG.

An EX-200X level master monitoring device manufactured by Hitachi Construction Machinery Co., Ltd. is a display device for displaying position information of the tip of a bucket, which is a component of a front working machine, and the like. An operation unit for switching the display contents of the display and a display control unit for controlling the display contents in accordance with the operation of the operation unit are integrally formed, and display a distance from the ground surface to the tip of the bucket, an angle of the bucket, and the like. This allows the user to properly perform excavation work while watching the display.

Further, Japanese Utility Model Laid-Open No. 6-27288 discloses that
1 shows a display device in which a display device is provided at a corner where a front panel and a side panel of a cab for a driver's cab are in contact with each other.
In this display device, if the position information of the front work machine is displayed on the display device, the operator can appropriately perform the excavation work on the groove or the slope while watching the display screen.

[0006]

SUMMARY OF THE INVENTION U.S. Pat.
In the EX-200X level master monitor device manufactured by Hitachi Construction Machinery Co., Ltd. shown in FIG. 12 of Japanese Patent No. 7,365, the display unit, the operation unit, and the display control unit are integrally formed. In the display device described in Japanese Patent Application Laid-Open No. 27288/1990, according to FIG. 2 of the publication, a display device having a display unit and an operation unit is shown. That is, the display unit and the operation unit are integrally formed. For this reason, the above-mentioned prior art has the following problems.

1) When the display device breaks down, only the failed portion cannot be replaced, and the entire display device must be replaced. Therefore, the cost is high. For example,
The display unit is often a liquid crystal display, and among display devices, the display unit is most susceptible to the working environment such as vibration, dust, and temperature during work, and is likely to break down. In such a case, if the display device is integrally formed, only the display unit cannot be replaced, and the entire display device must be replaced.

2) Since the display units are not independent, it is difficult to meet the user's various demands such as the presence or absence of color display on the display unit and the size of the screen.

3) When a function is added or changed, or when the display device is used for another construction machine, the shape of the operation unit including the size and arrangement of the switches or the display control unit is used. You have to change the microcomputer. Therefore, in the case of an integrated display device, it is necessary to change the entire device from the design or to change the software in accordance with the change of the microcomputer, which requires a large cost.

4) EX-2 manufactured by Hitachi Construction Machinery Co., Ltd.
00X level master monitor and 6-272
Both of the display devices described in Japanese Patent Publication No. 88 are disposed on the right front of the driver's seat. For this reason, the operator has to extend the arm forward to operate the display device, which leads to a reduction in work efficiency and causes fatigue of the operator.

An object of the present invention is to provide a display device for a construction machine which is inexpensive and easy to cope with a failure, a specification change, and a user's request, and has excellent operability.

[0012]

(1) In order to achieve the above object, the present invention is provided in a cab of a construction machine having a front work machine, and a display unit for displaying position information of the front work machine. A display unit for a construction machine, comprising: an operation unit for switching the display content of the display unit; and a display control unit for controlling the display content in accordance with the operation of the operation unit. It is assumed that at least the display unit of the control unit is separately provided from the operation unit and the display control unit as an independent unit, and these units are dispersedly arranged at different positions in the cab.

As described above, at least the display unit of the display unit, the operation unit, and the display control unit is separated from the operation unit and the display control unit and configured as an independent unit. In this case, it is only necessary to replace the failed unit without replacing the entire display device, and it is possible to deal with the failure of the display device easily and inexpensively. In addition, it is only necessary to change or replace the related units even when the specification is changed or the design is changed by the user's request. Furthermore, by disposing these units at different positions in the cab, the operator can easily check the display while driving and operate the display device without taking an unreasonable posture. Performance can be improved and operator fatigue can be reduced.

(2) In order to achieve the above object,
The present invention is provided in a cab of a construction machine having a front work machine, and a display unit that displays position information of the front work machine, an operation unit that switches display contents of the display unit, and an operation of the operation unit. In a display device for a construction machine comprising a display control unit for controlling the display content, the display unit, the operation unit, and the display control unit are separated from each other and configured as independent units. It is assumed that they are distributed at different positions in the cab.

As described above, the display unit, the operation unit, and the display control unit are separated from each other and configured as independent units, and these units are dispersedly arranged in the cab. If this occurs, only the failed unit need be replaced without replacing the entire display device, and it is possible to cope with the failure of the display device easily and inexpensively. In addition, it is only necessary to change or replace the related units even when the specification is changed or the design is changed by the user's request. Furthermore, by disposing these units at different positions in the cab, the operator can easily check the display while driving and operate the display device without taking an unreasonable posture. Performance can be improved and operator fatigue can be reduced.

(3) In the above (1) or (2), preferably, the operation section is arranged on a side of a driver's seat in the cab.

Thus, the operator can operate the display device without taking an unreasonable posture.

(4) In the above (1) or (2), preferably, the operation unit is arranged in a console box located on a side of a driver's seat in the cab.

With this configuration, the operator can operate the display device without taking an unreasonable posture.

(5) In the above (1) or (2), more preferably, the operation section is a hand-held operation section arranged on a side of a driver's seat in the driver's cab, and Wired or wireless connection is made.

Thus, the operator can operate the display device in a free posture.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the inside of a cab of a hydraulic shovel equipped with a display device according to a first embodiment of the present invention. In FIG. 1, reference numeral 6 denotes the entire cab, and the cab 6 has corner frames a, b, c,
d, side frames e and f and windowpanes g to l, which surround the driver's seat 308 inside the driver's seat 308, and a front working machine and an operation lever device 303L for turning on both front sides of the driver's seat 308; 303R, traveling pedals 301L, 301R and traveling levers 302L, 302R are disposed in front of the driver's seat 308, and console boxes 307L, 307R are disposed on both sides of the driver's seat 308, respectively. The console boxes 307L and 307R each include a control panel 3 provided with switches for monitoring the operating oil temperature, the remaining amount of fuel, and the like, and setting a work mode and a target engine speed.
04, an air conditioner unit 305, a radio 306, and the like.

The display device of the present invention is arranged in the cab 6. This display device comprises a display 41, a display control unit 42, and an operation device 43.
Is on the corner frame a in the front right of the driver's seat 308, and the operating device 43 is the console box 30 on the right side of the driver's seat 308.
7R, the display control unit 42 is housed below the operation device 43 in the console box 307R, and the display 41 displays the distance from the ground surface to the bucket tip, the angle of the bucket, and the like. The drills and slopes can be dug properly while watching.

FIG. 2 is a circuit diagram of a hydraulic shovel according to an embodiment of the present invention. The hydraulic excavator 1 has a lower traveling body 2, an upper revolving superstructure 3, and a front work machine 7. The upper revolving superstructure 3 is pivotally driven by a revolving motor (not shown) of the lower traveling body 2. It is attached to the front part so that it can move up and down. The upper swing body 3 includes a storage room 4, a counterweight 5, an operator's cab 6, and the like. The front working machine 7 is a multi-joint structure having a boom 8, an arm 9, and a bucket 10. The boom 8 is driven to rotate by a boom cylinder 11, the arm 9 is driven by an arm cylinder 12, and the bucket 10 is driven by a bucket cylinder 13.

Boom cylinder 11, arm cylinder 1
2. The bucket cylinder 13 has a control valve 24,
The control valves 24, 25, 26 are connected to the hydraulic pump 19 through 25, 26, and the flow rate and the direction of the pressure oil supplied from the hydraulic pump 19 to each of the cylinders 11, 12, 13 are adjusted. Here, although omitted for simplicity of the drawing, the hydraulic shovel 1 further includes a swing motor and a swing control valve corresponding to the swing motor, and the upper swing body 3 is driven to rotate by the swing motor, and the hydraulic pump is driven by the swing control valve. The flow rate and direction of the pressure oil supplied from 19 to the swing motor are adjusted.

Operation lever devices 303L and 303R are provided for the control valves 24, 25 and 26 and the turning control valve, respectively.
Operation levers 31, 32 and potentiometers 31a, 31
b, 32a, 32b, and when the operation lever 31 is operated in the front-rear direction A, the operation amount is
a detects an electric operation signal X1 corresponding to the operation amount.
When the operation lever 31 is operated in the left-right direction B, the operation amount is detected by the potentiometer 31b, and an electric operation signal X2 corresponding to the operation amount is output. When the operation is performed, the operation amount is detected by the potentiometer 32a, and an electric operation signal X3 corresponding to the operation amount is output.
Is operated, the operation amount is detected by the potentiometer 32b, and an electric operation signal X4 corresponding to the operation amount is output.

Potentiometers 31a, 31b, 32
a, 32b, the operation signals X1, X2, X3,
X4 is sent to the control unit 50, and this control unit 5
0 performs a predetermined calculation based on the operation signals X1, X2, X3, X4, and electromagnetic proportional valves 24L, 24R, 25L, 25R, 26 provided in the control valves 24, 25, 26, respectively.
A control signal is output to L, 26R and an electromagnetic proportional valve provided in a turning control valve (not shown). Electromagnetic proportional valve 24L, 2
4R, 25L, 25R, 26L, 26R are control valves 24,
The control valves 24, 25, 26 are provided corresponding to the respective hydraulic drive units 25, 26, and the control valves 24, 25, 26 are electromagnetic proportional valves 24L, 24L.
R, 25L, 25R, 26L, 26R, the switching direction and opening are adjusted in accordance with the pilot pressure indicated by the pilot pressure. The same applies to the solenoid proportional valve of the swing control valve. The direction and the flow rate of the pressure oil supplied to the arm cylinder 12, the bucket cylinder 13, and the turning motor (not shown) are controlled.

The boom 8 has a boom rotation angle detector 34 for detecting the rotation angle of the boom 8, the arm 9 has an arm rotation angle detector 35 for detecting the rotation angle of the arm 9,
The bucket 10 is provided with a bucket rotation angle detector 36 for detecting the rotation angle of the bucket 10. The boom rotation angle detector 34, the arm rotation angle detector 35, and the bucket rotation angle detector 36 are respectively connected to the front side. Work machine 7
Output electrical angle signals α, β, and γ according to the attitude of the camera.

The angle signals α, β, and γ output from the boom rotation angle detector 34, the arm rotation angle detector 35, and the bucket rotation angle detector 36 are input to the control unit 50, and the control unit 50 , Β, γ, the position of the tip of the bucket 10 is calculated, and the serial communication line 3
The display data is output to the display control unit 42 of the display device 40 connected via the display device 9. The display control unit 42 displays the input display data on the display 41, and controls the control unit 5 based on an operation signal of the operation device 43.
0 indicates the requested operation content.

FIG. 3 shows the configuration of the control unit 50. The control unit 50 controls the angle signals α, β, γ and the potentiometer 3 input from the boom rotation angle detector 34, the arm rotation angle detector 35, and the bucket rotation angle detector 36, respectively.
A for converting operation signals X1, X2, X3, X4 input from 1a, 31b, 32a, 32b into digital signals
/ D converter 110, central processing unit (CPU) 12
0, a read-on memory (ROM) 130 for storing a control procedure program and constants required for control, a random access memory (RAM) 140 for temporarily storing the calculation results or numerical values during the calculation, and communication with the display device 40 Serial communication interface (S
CI) 150, a single-chip microcomputer 1 including a D / A converter 160 for converting a digital signal to an analog signal
00, a nonvolatile memory (EEPROM) 170 for storing control constants for each model or grade, and an amplifier 180.

FIG. 4 shows the configuration of the display control unit 42 of the display device 40. The display control unit 42 is an interface (I / O) for receiving a signal from the operation device 43.
210, a central processing unit (CPU) 220, a read-on memory (ROM) 230 for storing control procedure programs and constants necessary for control, and a random access memory (RA) for temporarily storing the calculation results or numerical values during the calculation.
M) 240, a serial communication interface (SCI) 2 for communicating with the control unit 50
50 including a single-chip microcomputer 200 including
1 is composed of a memory 270 for drawing or processing display contents to be displayed on the display unit 1, a display operation unit 280 for displaying the contents, and an interface 290 for outputting the display contents created by the display operation unit 280 to the display 41. ing.

According to the present embodiment configured as described above, the following effects can be obtained.

1) When the display device 40 fails, only the failed unit can be replaced without replacing the display device 40 in its entirety.

2) Since the display 41 is independent, a commercially available display device according to the user's preference can be selected and attached.

3) Since the operation device 43 is independent, when the function is added or changed, only the operation device 43 or the display control unit 42 can be used without replacing or changing the design of the display device 40 in its entirety. It may be replaced or changed in design.

4) Since the operating device 43 is mounted on the console box 307R on the right side of the driver's seat 308,
Since the operator can operate the display device in a reasonable posture, it is possible to prevent a decrease in work efficiency and to reduce operator fatigue.

FIGS. 5 and 6 show a second embodiment of the present invention.
This will be described below. In the figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. In the present embodiment, the operation device is not fixed but movable and is hand-held.

In FIG. 5, the display device according to the present embodiment has a hand-held operation device 43A, which is non-fixedly mounted on a side frame e constituting the cab 6a.

FIG. 6 is an enlarged view of the installation state of the hand-held operation device 43A viewed from the side (left direction in FIG. 5). The hook 310 is provided on the side frame e, and the hand-held operation device 43A is provided.
Is provided with a hanging bracket 43a on its back plate,
Can be hooked on the hook 310. The hand-held operation device 43A is connected to a display control unit 42A housed in a console box 307R via a cord 43c.

FIGS. 7 and 8 show another example of a display device having a non-fixed hand-held operation device.

In FIG. 7, the display device according to the present embodiment has a wireless hand-held operation device 43B, and the hand-held operation device 43B is connected to the right side of the cab 6b (the window glass g).
Side) is fixedly mounted on a side panel 311 provided on the side (side). The display control unit 42B is provided with a receiving unit 44, and the receiving unit 44 is installed on the surface of the console box 307R so that a radio signal of the hand-held operation device 43B can be received.

FIG. 8 is a sectional view taken along the line XX in FIG. 7 and shows the installation state of the hand-held operation device 43B. Code 4
Reference numeral 5a denotes a recess provided in the side panel 311. Grooves 45b are further provided on both sides of the recess 45a, so that the hand-held operation device 43B can be fitted into the recess 45a, and the hand-held operation device 43B is provided. It has a configuration that makes it easy to grasp when removing.

According to the present embodiment configured as described above, the effects 1) to 4) can be obtained, and the operating device is made to be a hand-held type. And operability is further improved.

The arrangement of the display, the control unit for display, and the operating device is not limited to the embodiments shown in FIGS. 1, 5 and 7, and various modifications are possible.

For example, in the above embodiment, the display device is divided into three parts: a display device, a display control unit, and an operation device.
Although the respective units are configured as independent units, in the embodiment shown in FIG. 1, the display control unit and the operating device may be integrated, and the display unit may be configured as an independent unit.

In the embodiment shown in FIG. 1, the display 41 may be mounted on the frame b at the front left of the cab 6, and the operating device 43 may be connected to the console box. 307L. In this case, the position can be easily changed by exchanging the positions of the radio 306 and the operation device 43. Further, the display control unit 42 may be stored in another space such as under a rear cover (not shown) behind the driver's seat 308.

Further, in the embodiment shown in FIGS. 5 and 7 in which the operating device is a hand-held type, the operating device is hung using a hanging tool or is fitted therein. However, a storage space is provided in the console box. The operating device may be stored therein.

In the embodiment shown in FIG. 7 using the wireless hand-held operation device 43B, the receiving section 44 of the hand-held operation device 43B is operated so that the operator can easily perform the operation.
May be provided on the display 41B side, and the display control unit 42B and the receiving unit 44 may be connected by a cord.

[0050]

According to the present invention, it is possible to easily and inexpensively deal with a failure of a display device of a construction machine, a change in specifications, or a user's request, and improve operability.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state inside a cab of a construction machine according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the hydraulic shovel according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of a second control unit illustrated in FIG. 2;

FIG. 4 is a diagram illustrating a configuration of a display control unit illustrated in FIG. 2;

FIG. 5 is a plan view showing a state inside a cab of a construction machine according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating an installation state of the operation device illustrated in FIG. 5;

FIG. 7 is a plan view showing a state inside a cab of a construction machine according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating an installation state of the operation device illustrated in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Undercarriage 3 Upper revolving superstructure 4 Storage room 6 Operating room 7 Front work machine 8 Boom 9 Arm 10 Bucket 11 Boom cylinder 12 Arm cylinder 13 Bucket cylinder 40 Display device 41 Display device 42 Display control unit 43 Operating device 50 Control unit 303L, 303R Operation lever device 304 Operation panel 307L, 307R Console box 308 Driver's seat 311 Side panel

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tomita Tadashi ▼ Hisashi 650, Kandate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Construction Machinery Co., Ltd. Tsuchiura Plant F-term (reference) 2D015 HA03 HB05 3D044 BA00 BA16 BB07 BD01 BD08 BD13

Claims (5)

[Claims] 1. A display unit provided in a cab of a construction machine having a front work machine, for displaying position information of the front work machine, an operation unit for switching display contents of the display unit, and an operation of the operation unit A display device for a construction machine, comprising: a display control unit that controls the display content according to the display unit, wherein at least the display unit of the display unit, the operation unit, and the display control unit is controlled by the operation unit and the display control unit. A display device for a construction machine, wherein the display device is configured as separate and independent units, and these units are dispersedly arranged at different positions in a cab. 2. An operation unit provided in a cab of a construction machine having a front work machine, for displaying position information of the front work machine, an operation unit for switching display contents of the display unit, and an operation unit for operating the operation unit. A display device for a construction machine, comprising a display control unit for controlling the display content, wherein the display unit, the operation unit, and the display control unit are separated from each other and configured as independent units. Characterized in that they are distributed at different positions in the cab. 3. The display device for a construction machine according to claim 1, wherein the operation unit is arranged on a side of a driver's seat in the cab. 4. The display device for a construction machine according to claim 1, wherein the operation unit is disposed in a console box located on a side of a driver's seat in the cab. . 5. The display device for a construction machine according to claim 1, wherein the operation unit is a hand-held operation unit disposed at a side of a driver's seat in the cab, and a wired control unit is connected to the display control unit. Alternatively, a display device of a construction machine, which is wirelessly connected.