JP2580018Y2 - Containment equipment for aerial work vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A boom is provided on a vehicle so that it can be raised and lowered, and a posture maintaining member for maintaining a posture irrespective of an angle of the boom is provided at a tip of the boom, and a work table is mounted via the posture maintaining member. The present invention relates to a storage device for an aerial work vehicle.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. The aerial work vehicle 1 is turned on a crawler-type vehicle 2 by a turntable 3
The swivel 3 is provided with a boom 5 which is freely raised and lowered by an up-and-down cylinder 4 and is freely driven to expand and contract by an extendable cylinder 6, and has a posture at the tip of the boom 5 irrespective of the up-and-down angle of the boom 5. A posture maintaining member 7 for maintaining is provided, and a work table 8 is attached via the posture maintaining member 7. The posture maintaining member 7 is adjusted from the beginning so that the work table 8 is horizontal when the vehicle is installed horizontally. The leveling device includes a posture maintaining member 7, an up-and-down cylinder 4 connecting between the swivel base 3 and a base boom 5 a of the boom 5, and a leveling cylinder 9 connecting a tip of the boom 5 and a proper position of the posture maintaining member 7, A connection oil passage 10 that connects the oil chambers of the undulating cylinder 4 and the leveling cylinder 9, supply oil passages 11 and 12 that supply pressure oil to the oil chambers of the undulating cylinder 4 and the leveling cylinder 9, and a pump (a utility model registration request) The main switching valve 13 controls the supply and discharge of the pressure oil from the hydraulic pressure source 15 to the supply oil passages 11 and 12, and the switching valve 14 expands and contracts the leveling cylinder 9 regardless of the up-and-down movement of the boom. .

An aerial work vehicle has a main switching valve during normal work.
When the cylinder 13 is operated to the extension side of the up / down cylinder 4, the pressure oil from the pump 15 is supplied from the supply oil passage 11 to the extension side oil chamber of the up / down cylinder 4, and the up / down cylinder 4 is extended. The pressure oil discharged from the reduction-side oil chamber of the undulating cylinder 4 passes through the connection oil passage 10 and is supplied to the extension-side oil chamber of the leveling cylinder 9. The pressure oil discharged from the reduction-side oil chamber of the leveling cylinder 9 passes through the supply oil passage 12, returns to the main switching valve 13, and returns to the tank 16. The up-and-down cylinder 4 and the leveling cylinder 9 operate in conjunction with each other, and the cross-sectional areas and the mounting positions of these cylinders are determined so as to maintain the posture maintaining member 7 in a predetermined posture regardless of the up-and-down angle of the boom 5. Therefore, the angle between the boom 5 and the posture maintaining member 7 is changed according to the change in the up-and-down angle of the boom 5,
As a result, the posture maintaining member 7 maintains the posture by the same angle in the direction opposite to the up / down operation of the boom 5. When the main switching valve 13 is operated to the reduction side of the up / down cylinder 4, the pressure oil from the pump 15 is supplied from the supply oil passage 12 to the reduction side oil chamber of the leveling cylinder 9. Then, the pressure oil flows in the opposite direction to the case where it is operated to the extension side of the up / down cylinder 4, and the main switching valve 13
And then to tank 16. Maintaining the posture maintaining member 7 in a predetermined posture irrespective of the elevation angle of the boom 5 is similar to the case where the operation is performed on the extension side of the elevation cylinder 4.

[0004] When the work table 8 is inclined for work on an inclined ground or when the inclined work table 8 is returned to a predetermined posture, it is necessary to adjust the leveling of the work table 8. At the time of leveling adjustment of the worktable 8, if the switching valve 14 is switched,
The pressure oil from the pump 15 is supplied to the connection oil passage 10 or the supply oil passage 12.
To expand or contract the leveling cylinder 9. The pressure oil discharged from the leveling cylinder 9 returns to the switching valve 14 through the supply oil passage 12 or the connection oil passage 10, and then returns to the tank 16. At this time, the pilot check valves of the supply oil passages 11 and 12 are both closed at this time, so that the undulating cylinder 4 does not operate. Then, only the leveling cylinder 9 operates. When the inclination of the posture maintaining member 7 changes, the inclination of the work table 8 attached thereto also changes. Therefore, the inclination of the work table 8 is monitored, and the switching valve 14 is set to neutral when the horizontal position comes out. I just need to put it back.

[0005]

When the work platform 8 is tilted and the work is finished and the aerial work vehicle 1 is in the retracted position after the work is completed, the boom 5 is lowered and the leveling of the work platform 8 is adjusted. For this purpose, the main switching valve 13 is operated to operate the undulating cylinder 4 and the switching valve 14 is operated.
Must be operated to operate the leveling cylinder 9. Therefore, there is a problem that the operation is complicated, and if one of the operations is forgotten, the overall height of the aerial work vehicle 1 remains high, which becomes an obstacle during transportation or the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a storage device for an aerial work vehicle that does not require a complicated operation when the aerial work vehicle 1 is placed in a storage position and that can perform a reliable storage operation. Things.

[0007]

SUMMARY OF THE INVENTION A storage device for an aerial work vehicle according to the present invention is provided with a boom mounted on a vehicle so that the boom can be raised and lowered, and a posture maintaining member for maintaining a posture at the tip of the boom irrespective of the boom angle. A storage device for an aerial work vehicle having a workbench mounted via the posture maintaining member, the hoisting cylinder connecting the vehicle and the base end boom at an appropriate position, and connecting the boom tip and the position maintaining member at an appropriate position. A leveling cylinder, a connection oil passage connecting the undulating cylinder and the oil chamber of the leveling cylinder,
A supply oil passage that supplies pressure oil to the oil chambers of the up-and-down cylinder and the leveling cylinder, a main switching valve that controls the supply and discharge of pressure oil from a hydraulic source to the supply oil passage, and a leveling cylinder that expands and contracts regardless of the up-and-down movement of the boom A storage switch for selecting a storage operation, a boom storage detection device for detecting that the boom is at a storage position,
A drive means for outputting a drive signal for driving the main switching valve and the switching valve according to a detection result of the work table storage detection device, the boom storage detection device and the detection result of the work table storage detection device for detecting that the work table is in the storage position, When the storage operation is selected by the storage switch, the drive means outputs a drive signal for driving the leveling cylinder to the storage side when the boom storage detection device performs the detection operation, and raises and lowers the cylinder when the workbench storage detection device performs the detection operation. A drive signal for driving the storage cylinder is output and a drive signal for driving the up-and-down cylinder to the storage side is output when the boom storage detection device and the workbench storage detection device are not detecting.

[0008]

When the storage operation is selected by the storage switch when the aerial work vehicle 1 is set to the storage posture, the drive means operates the up-and-down cylinder when the boom storage detection device and the worktable storage detection device are not detected. A drive signal for driving the leveling cylinder 9 to the storage side is output when only the boom storage detection device performs the detection operation, and a drive signal for driving the leveling cylinder 9 to the storage side is output when only the workbench storage detection device performs the detection operation. A drive signal for driving the cylinder 4 to the storage side is output, and when both the boom storage detection device and the workbench storage detection device perform the detection operation, no drive signal is output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. The reference numerals 1 to 16 described and used in the description of the related art are synonymous, and thus the description is omitted and used in the following description. 21 is a boom storage detection device, 22 is a workbench storage detection device, 23 is a storage switch, and 24 is driving means.

The boom storage detection device 21 is a detection device for detecting that the boom 5 is at the storage position, and includes a limit switch mounted on the vehicle 2. The workbench storage detection device 22 is a detection device that detects that the workbench 8 is in the storage position, and is configured by a limit switch attached to the boom 5. The storage switch 23 is a switch for selecting a storage operation, and the boom storage detection device 21
And it is located between the workbench storage detection device 22 and the driving means 24. The storage switch 23 transmits the detection signal from the boom storage detection device 21 and the workbench storage detection device 22 to the driving means 24 when the storage operation is selected, and does not transmit the detection signal to the driving means 24 when the storage operation is not selected. .
The drive means 24 operates the main switching valve 13 and the switching valve according to the detection results of the boom storage detection device 21 and the workbench storage detection device 22.
A drive signal for driving 14 is output. In detail, the driving means
24 outputs a drive signal for driving the leveling cylinder 9 to the storage side to the switching valve 14 when a detection signal is input from the boom storage detection device 21, and raises and lowers when a detection signal is input from the workbench storage detection device 22. The drive signal for driving the cylinder 4 to the storage side is output to the main switching valve 13.

The operation will be described. At the time of normal work, the description is omitted because it is not different from the conventional technology at all.

When the work table 8 is tilted for work on a slope, etc., there is no difference from the prior art, and a description thereof will be omitted.

A case will be described in which the work table 8 is inclined and work is performed, and after the work is completed, the aerial work vehicle 1 is in the retracted posture. The storage switch 23 selects the storage operation. Boom storage detector 21 and platform storage detector 22
Is in a state of being transmitted to the drive means 24. Here, the boom storage detector 21 and the platform storage detector
When neither of the detection signals from the control unit 22 and the detection unit 22 is input to the driving unit 24, the driving unit 24 outputs a driving signal for driving the up-and-down cylinder 4 to the storage side to the main switching valve 13, so that the boom storing operation is performed. . When a detection signal is input to the driving unit 24 only from the boom storage detection device 21, the driving unit 24 drives the leveling cylinder 9 to the storage side without outputting a drive signal for driving the up / down cylinder 4 to the storage side. Since the drive signal is output to the switching valve 14, the worktable storing operation is performed. Further, the detection signal is output only from the platform storage detecting device 22 to the driving means 24.
Is input to the main switching valve 13, the drive means 24 outputs the drive signal for driving the up-and-down cylinder 4 to the storage side without outputting the drive signal for driving the leveling cylinder 9 to the storage side. The operation is performed. When both the boom storage detection device 21 and the workbench storage detection device 22 are input to the drive means 24, no drive signal is output, so that the boom storage operation and the workbench storage operation are not performed.
That is, it stops automatically.

Since the operation is performed as described above, when the work platform 8 is inclined and the work is completed and the work platform 1 is put into the retracted posture after the work is completed, both the main switching valve 13 and the switching valve 14 are used. It does not require the complicated operation of operating the storage switch 23.
This is a very convenient and safe device because it only needs to be operated to select the storage operation, and stops automatically when the storage position is reached.

Although the boom storage detection device 21 and the workbench storage detection device 22 have been described as being constituted by limit switches, it goes without saying that a proximity switch or a potentiometer may be used.

The driving means 24 is a power supply for supplying electric power for driving the main switching valve 13 or the switching valve 14 when a detection signal is input from the boom storage detecting device 21 or the workbench storing detecting device 22. Alternatively, in a similar case, a microcomputer-type power supply that supplies power for driving the main switching valve 13 or the switching valve 14 in association with the selection state of the storage switch 23 may be used.

Although the storage device according to the present invention is applied to a leveling device in which the up-and-down cylinder 4 and the leveling cylinder 9 are connected in series, it is needless to say that the storage device can be applied to a leveling device in which an upper leveling cylinder and a lower leveling cylinder are connected in parallel. .

[0018]

[Effects of the Invention] The storage device for the aerial work vehicle of the present invention has a configuration in which a simple device is added to the conventional aerial work vehicle, and the complicated operation for setting the storage position is eliminated, and the storage operation is forgotten. This is very effective in improving workability and safety.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a storage device of an aerial work vehicle of the present invention.

FIG. 2 is an explanatory view of an aerial work vehicle.

FIG. 3 is a hydraulic circuit diagram of a conventional aerial work vehicle.

[Explanation of symbols]

5 Boom 7 Posture maintaining member 8 Workbench 9 Upper leveling cylinder 10 Connection oil passage 11, 12 Supply oil passage 21 Boom storage detection device 22 Workbench storage detection device 23 Storage switch 24 Drive means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66F 9/00-11/04

Claims (1)

(57) [Scope of request for utility model registration] A boom is provided on a vehicle so that the boom can be raised and lowered, a posture maintaining member is provided at a tip end of the boom irrespective of the boom angle, and a work table is mounted via the posture maintaining member. A storage device for a work vehicle, comprising: an up / down cylinder connecting the vehicle and a base end boom at an appropriate position, a leveling cylinder connecting an end portion of the boom to an appropriate position at a posture maintaining member, and a connecting oil for connecting an oil chamber of the up / down cylinder and the leveling cylinder. The supply oil passage that supplies pressure oil to the oil chambers of the passage, the up / down cylinder and the leveling cylinder, the main switching valve that controls the supply and discharge of pressure oil from the hydraulic source to the supply oil passage, and the leveling cylinder regardless of the boom up / down A storage switch that selects the storage operation, a boom storage detection device that detects that the boom is in the storage position, and a work table that is stored in an aerial work vehicle that has a switching valve that expands and contracts And a drive means for outputting a drive signal for driving the main switching valve and the switching valve based on the detection result of the workbench storage detection device, the boom storage detection device, and the workbench storage detection device. When the operation is selected, the drive means outputs a drive signal to drive the leveling cylinder to the storage side when the boom storage detection device performs the detection operation, and drives the up / down cylinder to the storage side when the workbench storage detection device performs the detection operation. An aerial work vehicle, which is configured to output a drive signal for driving the up-and-down cylinder to the storage side when the boom storage detection device and the workbench storage detection device are not detected. Storage device.