JP2000335892A - Bench levelling adjusting device for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bench levelling adjusting device easily operable for returning inclination of a bench to a horizontal state. SOLUTION: This device comprises an upper levelling cylinder 27 to oscillate a bench 25 provided on a tip of a telescoping boom capable of oscillation, an angle sensor 55 to detect inclination of the bench 25, a bench inclination horizontal operation switch 59 operated for correcting inclination of the bench 25, a hydraulic pump 47 to supply operating fluid, an inclination correcting control valve 49 to control supply of operating fluid from the hydraulic pump 47 to a levelling passage 43, and a switching valve 51 to supply operating fluid supply-controlled based on on-operation to the bench inclination horizontal operation switch 59 to a cylinder passage 43. As the bench inclination horizontal operation switch 49 is put on, the inclination correcting control valve 49 conducts operating fluid supply control to the cylinder passage 43 based on a detection value of the angle sensor 55 to correct inclination of the bench 25 to be horizontal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench leveling adjustment device for a work vehicle, and more particularly, to a workbench provided at a tip end of a boom provided on a vehicle body so as to be vertically swingable. The present invention relates to a worktable leveling adjustment device for a work vehicle that adjusts the operation of a leveling device that holds horizontally regardless of the undulating angle of the worktable.

[0002]

2. Description of the Related Art There is an aerial work vehicle having a swingable worktable at the end of a telescopic boom, and a leveling device for horizontally holding the worktable. The telescopic boom is pivotally connected to the upper part of a swivel that is pivotally mounted on the vehicle body, and the telescopic boom is raised and lowered by the telescopic operation of an up-and-down cylinder that is pivotally connected between the telescopic boom and the bottom of the swivel. Have been. Inside the telescopic boom, a telescopic cylinder for extending and retracting the telescopic boom is incorporated. Also,
A vertical post is provided at the tip of the telescopic boom so as to be swingable in the vertical direction, and a workbench is attached to the tip of the vertical post. The leveling device has an upper leveling cylinder pivotally connected between the lower part of the vertical post and the tip of the telescopic boom, and a lower leveling cylinder pivotally connected between the telescopic boom and the swivel table. Accordingly, the lower leveling cylinder expands and contracts, and at the same time, the upper leveling cylinder operates so as to expand and contract in conjunction with it.

These leveling cylinders are provided in a hydraulic circuit 80 for controlling the operation of the telescopic cylinder 15 shown in FIG. 3, and the hydraulic circuit 80 is divided into a main flow path 81 for operating the telescopic cylinder 15 and a branch from the main flow path 81. And a branched branch channel 83. The main flow path 81 has a hydraulic pump 47 for discharging hydraulic oil from the downstream side and a control valve 84 for controlling the flow of hydraulic oil. And the telescopic cylinder 15 is telescopically operated. The branch passage 83 communicates between the bottom chamber and the rod chambers of the upper leveling cylinder 27 and the lower leveling cylinder 19, and the first passage 63 communicates between the first passage 63 and the main passage 81. And a second flow path 65.

A safety valve 67 is provided in the first passage 63,
The safety valve 67 has a function of preventing the workbench from suddenly tilting when the first oil passage 63a and the like between the safety valve 67 and the lower leveling cylinder 19 are damaged and hydraulic oil leaks. In addition, a stop valve 85 is provided in the second flow path 65, and the stop valve 85 is provided on a side of the swivel that is separated from a boom operating device provided on the side of the swivel, and is normally closed and closed. One flow path 63 forms a closed circuit. Therefore, when the up-and-down cylinder moves up and down and the telescopic boom moves up and down, the lower leveling cylinder 1
9 expands and contracts, and at the same time, the upper leveling cylinder 2
7 expands and contracts. For this reason, the work table can always be held horizontally.

When the working oil in the branch passage 83 leaks or the temperature of the hydraulic oil changes and the work table tilts, the stop valve 85 is opened to connect the main passage 81 to the branch passage 83. By supplying the operating oil to the branch passage 83, the inclination of the worktable can be corrected.

[0006]

However, in order to open the stop valve when the work table is tilted, the operator moves to the stop valve located at a position separated from the boom operating device, and further moves the handle of the stop valve. Turning work is required, which increases the labor of the operator. Also, if the temperature of the hydraulic oil changes due to the neglected environment of the vehicle, or if the minute leakage of the hydraulic oil continues for a long period of time, the work table will tilt, but unless the stop valve is opened to increase the labor of the operator. Since the work table cannot be adjusted horizontally, if the stop valve is not operated, the inclination of the work table cannot be corrected, and the working environment of the worker on the work table will deteriorate, and the telescopic boom will be stored. At times, the work table may come into contact with the vehicle body and damage the work table or the like.

A triangle formed by connecting the pivot points at both ends of the upper leveling cylinder, the tip of the telescopic boom, and the pivot point of the vertical post to each other forms a triangle with the pivot points at both ends of the lower leveling cylinder. The workbench can be leveled by making the swivel base and the pivot point between the bases of the telescopic booms similar to a triangle formed by connecting them to each other. If the similarity between triangles breaks, the workbench cannot be held horizontally,
There is a problem that it takes time to make the hydraulic pressure of the hydraulic oil in the first flow path sufficient, and the followability of the swing motion of the worktable is reduced.

The present invention has been made in view of such a problem, and corrects the inclination of the work table without increasing the labor of the worker even if the work table is inclined, so that the work environment of the worker can be improved. Prevent deterioration, prevent the possibility of damaging the work table, etc.,
An object of the present invention is to provide a workbench leveling adjustment device that does not reduce the followability of the swing motion of the workbench.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a workbench leveling adjustment device for a work vehicle according to the present invention comprises a boom (for example, a telescopic boom 13 in the embodiment) provided on a vehicle body so as to be able to move up and down. And a leveling actuator that swings the workbench up and down regardless of the boom up / down operation to level the workbench (for example, the upper part in the embodiment). A leveling cylinder 27), a tilting angle detecting means (eg, the angle sensor 55 in the embodiment) for detecting a tilting angle of the working table from a horizontal position, and a tilting mechanism of the working table. Work platform tilt correction operation means (for example, work platform tilt horizontal operation switch 59 in the embodiment) operated for correction;
Actuator operation control means for adjusting the operation amount of the leveling actuator in accordance with signals from the workbench inclination correcting operation means and the inclination angle detection means to correct the workbench inclination to level the workbench (for example, in the embodiment, It is preferable to have a hydraulic pump 47, a tilt correction control valve 49, a switching valve 51, and a controller 53).

When the workbench inclination horizontal operation means is operated,
The actuator operation control means adjusts the operation amount of the leveling actuator based on the detection values of the workbench inclination horizontal operation means and the inclination angle detection means and swings the workbench up and down to correct the workbench horizontally.

[0011] The operator can correct the tilted workbench horizontally by operating the workbench tilt horizontal operation means, and as compared with the prior art in which the stop valve had to be operated, Since it is sufficient to operate the horizontal operation means, an increase in labor of the operator can be prevented. Also, since the inclination of the worktable can be easily corrected, the work environment can be improved by preventing the work from being performed in a state where the worktable is tilted. In addition, it is possible to prevent damage to the vehicle and the vehicle body, and it is possible to prevent a decrease in followability in swinging the worktable. The workbench tilting horizontal operation means can be provided at a place where the operator can easily operate, and may be provided not only at one place but also at a plurality of places.

The leveling actuator has an upper leveling cylinder pivotally connected to the tip of the boom, and the boom is pivotally connected to a lower leveling cylinder interlocking with the operation of raising and lowering the boom. The actuator operation control means includes a hydraulic oil supply means (for example, a hydraulic pump 47 in the embodiment) for supplying hydraulic oil to the leveling flow path, and a workbench inclination correcting operation means. When the is operated, a tilt correction control valve (for example, which corrects the tilt of the workbench horizontally by controlling the supply of the hydraulic oil from the hydraulic oil supply means to the leveling flow path based on the detection value of the tilt and tilt angle detecting means (for example, , The inclination correction control valve 49 and the switching valve 51) in the embodiment.

When the workbench inclination horizontal operation means is operated,
The inclination correction control valve controls the supply of hydraulic oil from the hydraulic oil supply means to the leveling flow path based on the detection value of the inclination angle detection means, and causes the hydraulic oil to flow into the leveling flow path. When the hydraulic oil flows into the leveling flow path, the upper leveling cylinder expands and contracts, the worktable swings up and down, and the worktable is corrected to a horizontal position.

Here, the workbench inclination horizontal operating means is used for operating the inspection operation means operated when checking the operation of the boom and the power take-off mechanism for extracting the driving force of the engine which is the driving source of the vehicle body. The power take-off mechanism operating means for operating, the storage detection means for detecting that the boom is stored in the vehicle body, and the boom operating means for operating the boom are operated in conjunction with at least one of the boom operation means. If any of the inspection operation means, the power take-off mechanism operation means, the storage detection means, and the boom operation means are operated or detected, the workbench inclination horizontal operation means is operated, and the inclination correction control valve is operated. The workbench may be adjusted horizontally.

When any of the inspection operation means, the power take-off mechanism operation means, the storage detection means and the boom operation means are operated or detected, the workbench inclination horizontal operation means is operated in conjunction with the inclination angle detection means. The inclination correction control valve controls the supply of the hydraulic oil from the hydraulic oil supply means to the leveling flow path based on the detected value of, so that the inclination of the workbench is corrected horizontally.

Even if the operator does not operate the workbench inclination horizontal operation means, if any of the inspection operation means, the power take-off mechanism operation means, the storage detection means and the boom operation means is operated or detected, the operation is performed. The table tilt horizontal operation means operates in conjunction to correct the tilt of the work table horizontally,
When performing boom inspection work, the boom can be inspected while the workbench is held in a horizontal state, and when the boom is stored in the vehicle body, the workbench can be stored in a horizontal state. The work platform is held horizontally when the boom is operated, and the work environment is not affected by the tilt of the work platform. Deterioration can be prevented beforehand.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment shows an aspect of an aerial work vehicle having a telescopic boom that can be raised and lowered and swiveled on a vehicle body, and a worktable that can swing up and down at the tip of the telescopic boom. First, before describing the work platform leveling adjustment device of the present invention, an aerial work vehicle equipped with the work platform leveling adjustment device will be described.

As shown in FIG. 1, the aerial work vehicle 1 is constructed based on a truck, and a driving cabin 5 is provided at a front portion of the vehicle body 3. Outrigger jacks 7 are provided on the left and right sides of the front and rear to protrude laterally of the vehicle body 3 and ground the lower end portion to stably support the vehicle body 3. Note that the aerial work vehicle 1 is not limited to a truck, and may be a self-propelled work vehicle having wheels or crawlers. A turntable 9 that can turn freely is provided at the center of the rear part of the vehicle body 3, and a turntable 11 that protrudes upward is attached above the turntable 9. A turning motor (not shown) is built in the vehicle body 3 below the turntable 9, and the turning table 11 is configured to turn freely by the operation of the turning motor.

A telescopic boom 13 is pivotally connected to the upper part of the swivel base 11. The telescopic boom 13 is configured by nesting three boom members, and includes a base boom member 13a, an intermediate boom member 13b, and a distal boom member 13c from the base side. A telescopic cylinder 15 is built in the telescopic boom 13, and the telescopic boom 13 is configured to expand and contract by operating the telescopic cylinder 15 to expand and contract. An up / down cylinder 17 is pivotally connected between an intermediate portion of the base end boom member 13a and a bottom of the swivel table 11.
The telescopic boom 13 is configured to move up and down by the telescopic operation of 7. A lower leveling cylinder 19 is pivotally connected between the base of the base boom member 13 a and the upper part of the swivel base 11 on the base end side of the telescopic boom 13 with respect to the up / down cylinder 17.

A vertical post 21 is provided at the distal end of the telescopic boom 13 so as to be vertically swingable.
A horizontal arm 23 protruding in the horizontal direction is provided at a distal end of the horizontal arm 23, and a work table 25 on which a worker can ride is attached to the horizontal arm 23. At the lower portion of the vertical post 21, an upper leveling cylinder 27 built in the distal end of the distal boom member 13c is pivotally connected. Work table 2 from upper levelling cylinder 27 and lower leveling cylinder 19
5, a triangular shape 29 formed by connecting the pivot points 27a and 27b at both ends of the upper leveling cylinder 27 and the pivot point 21a between the tip of the tip boom member 13c and the vertical post 21 to each other. And a triangle 31 formed by connecting the pivot points 19a and 19b at both ends of the lower leveling cylinder 19 and the pivot point 11a between the distal end of the swivel base 11 and the proximal end of the proximal boom member 13a. Are provided with an upper leveling cylinder 27 and a lower leveling cylinder 19 in a similar manner.

A boom operating device 30 for manually operating the telescopic boom 13 is provided on the side of the swivel table 11 and the work table 25. By operating the operation lever L of the boom operation device 30, the swing motor, the telescopic cylinder 15, the up-and-down cylinder 1
7, the telescopic boom 13 can be turned, telescopically moved, and raised and lowered to move the workbench 25 to a desired position.

Next, the worktable leveling adjusting device of the present invention will be described. The workbench leveling adjustment device is a device for correcting the workbench 25 to a horizontal position when the workbench 25 is inclined from a horizontal position. FIG. 2 is a circuit diagram of the worktable leveling adjustment device. As shown in FIG. 2, the worktable leveling adjustment device 40 includes a hydraulic oil supply passage 41 for supplying hydraulic oil, an upper leveling cylinder 27 and a lower leveling cylinder 19. (Hereinafter, also referred to as “leveling cylinder 19, 2
7 ". Leveling flow path 43 for supplying hydraulic oil to
And The hydraulic oil supply passage 41 has a hydraulic pump 47 for discharging hydraulic oil from a downstream side thereof, a tilt correction control valve 49, and a switching valve 51.

The tilt correction control valve 49 is electrically connected to the controller 53, and the controller 53 is provided on the work table 25 and detects the tilt angle of the tilt sensor 55 based on the detected value of the angle sensor 55. Adjust the opening of the valve to adjust the flow rate of hydraulic oil. The switching valve 51 includes a cylinder channel 57 communicating with the telescopic cylinder 15 and a leveling channel 43.
The hydraulic oil supply passage 41 is connected to the cylinder passage 5 based on an operation signal of the workbench horizontal operation switch 59.
7 or the leveling flow path 43. The cylinder flow path 57 is not limited to the flow path communicating with the telescopic cylinder 15, but may be a flow path to another actuator. Also, a dedicated flow path may be used without sharing with other actuators.

The switching valve 51 has a function of switching the connection with the hydraulic oil supply passage 41 to one of the leveling passage 43 and the cylinder passage 57, but is not limited to this. A separate switching valve may be used for the cylinder 43 and the cylinder flow path 57. In this case, a switching valve that connects or disconnects between the hydraulic oil supply channel 41 and the leveling channel 43 is provided separately from a switching valve that connects or disconnects between the hydraulic oil supply channel 41 and the cylinder channel 57, The workbench horizontal operation switch 59 is electrically connected to a switching valve that connects or disconnects the hydraulic oil supply channel 41 and the leveling channel 43. Further, the switching valve 51 and the inclination correction control valve 49 may be integrated.

The workbench horizontal operation switch 59 is a switch that is manually turned on and off by the operator. If the switch can be easily operated by the worker, the workbench horizontal operation switch 59 besides the swivel side shown in FIG. 5 or on the vehicle body 3 or the like. Further, the switching valve 51 may be configured to be operated wirelessly. Note that the workbench horizontal operation switch 59 is an inspection operation switch (not shown) that is operated when the telescopic boom 13 is inspected before starting operation, and a power take-off mechanism that extracts the driving force of an engine that is a driving source of the vehicle body 3. PT to operate when activating (PTO)
O operation switch (not shown) and telescopic boom 13
And a boom storage sensor (not shown) for detecting the state of being stored in the boom operating device 30 shown in FIG. be able to.

The leveling passage 43 is provided in each of the bottom chambers 1 of the upper leveling cylinder 27 and the lower leveling cylinder 19.
There is a pair of first flow paths 63 communicating between the rod chambers 9c, 27c and the rod chambers 19d, 27d, and a pair of second flow paths 65 branched from the pair of first flow paths 63 and communicating with the switching valve 51. are doing. Upper leveling cylinder 27 of a pair of first flow paths 63
A safety valve 67 is provided on the side. The safety valve 67 includes a first flow path 63 and a second flow path 6 that are upstream of the safety valve 67.
5, to prevent the workbench 25 from tilting sharply when the lower leveling cylinder 19 and the pilot check valve 69 are damaged and hydraulic oil leaks. Pilot check valves 69, 69 are provided in the pair of second flow paths 65, and a pilot oil passage 71 is provided between the pilot check valves 69.
It is connected to the. This pilot check valve 69 is
Normally closed, the platform tilt horizontal operation switch 59
Enters, the switching valve 51 switches, and the hydraulic oil supply passage 41
Is supplied to the second flow passage 65a from the second passage 65a. When the pressure exceeds a predetermined pressure, the pilot check valve 69 is opened and the second flow passage 6a is opened.
5 is supplied with pressurized oil. The second flow path 65 is provided with a relief valve 66 which is normally closed. However, when the pressure in the second flow path 65 exceeds a predetermined pressure, the relief valve 66 is opened to open the leveling closed circuit. (27, 67, 63,
19, 65) The operating oil is supplied to the outside to reduce the pressure in the closed circuit to a predetermined pressure or less to prevent the leveling circuit from being damaged.

Next, the operation of the workbench leveling adjusting device 40 will be described in the case where the minute leakage of the hydraulic oil from the leveling flow path 43 continues for a long time or the case where the environment in which the vehicle is left is changed. After moving the vehicle to the work site in a state where the telescopic boom 13 and the outrigger jack 7 are stored in the vehicle body 3 shown in FIG. 1, an operator performs an overhang operation of the outrigger jack 7 to stably support the vehicle body 3. Here, when the minute leakage of the hydraulic oil from the leveling flow path 43 continues for a long period of time or when the leaving environment of the vehicle changes,
The similarity between the triangle 29 formed from the pivot point of the upper leveling cylinder 27 and the triangle 31 formed from the pivot point of the lower leveling cylinder 19 is broken. In this state, the worker operates the boom operating device 3 provided on the swivel base 11.
0, the telescopic boom 13 is raised, and
5 may be inclined. Therefore, the operator turns on the workbench horizontal operation switch 59 before operating the boom operation device 30.
Manipulate.

At this time, since the workbench horizontal operation switch 59 is provided near the boom operation device 30, the operator can easily operate the workbench horizontal operation switch 59 without increasing labor.

When the workbench horizontal operation switch 59 is turned ON, the solenoid 61 of the switching valve 51 shown in FIG.
1 communicates with the leveling channel 43. Further, the controller 53 controls the operation of the inclination correction control valve 49 based on the detected angle value of the worktable 25 detected by the angle sensor 55. That is, when the work table 25 detects the inclination angle from the horizontal position by the angle sensor 55, the controller 53 adjusts the opening of the inclination correction control valve 49 according to the inclination angle and discharges the oil from the hydraulic pump 47. Switching oil 5
1 into the leveling channel 43. And
The inflowing hydraulic oil presses the hydraulic oil in the first flow path 63 and the second flow path 65, and the leaked leveling flow path 43 is filled with the hydraulic oil.

When the hydraulic oil is filled in the leveling flow channel 43, the telescopic boom 15 is in the retracted state and restrains the telescopic movement of the lower leveling cylinder 19, so that only the upper leveling cylinder 27 is telescopically moved. The inclination of the table 25 is corrected to the horizontal position. At this time, if the pressure of the hydraulic oil in the leveling flow path 43 exceeds a predetermined value,
The relief valve 66 is opened and the pressure oil flows from the second flow path 65 to the tank line, and the pressure of the hydraulic oil in the leveling flow path 43 is reduced to a predetermined value or less.

When the angle sensor 55 detects that the work table 25 has been corrected to the horizontal position, the detected angle value is input to the controller 53, and based on the detected angle value, the controller 53 controls the inclination correction control valve 49. And switching valve 51
To close the leveling flow path 43 to a closed circuit,
5 is kept horizontal. In this way, by turning on the workbench horizontal operation switch 59, the inclination of the workbench 25 can be corrected horizontally.

The workbench horizontal operation switch 59 includes an inspection operation switch (not shown) that is operated to check the operation of the telescopic boom 13, and a PTO operation switch that extracts the driving force of the engine and operates the hydraulic motor 47. (Not shown), when at least one of a boom storage sensor (not shown) for detecting a state in which the telescopic boom 13 is stored in the vehicle body 3 and a boom operating device 30 are electrically connected, these switches are used. By turning on and the like, the workbench horizontal operation switch 59 is operated in conjunction with it, and the inclination of the workbench 25 can be corrected to the horizontal position. The operation of correcting the inclination of the workbench 25 to the horizontal position is similar to the case where the workbench horizontal operation switch 59 is turned on, and the description thereof will be omitted.

[0033]

As described above, according to the workbench leveling adjustment device of the present invention, the actuator operation control means adjusts the operation amount of the leveling actuator by the signals from the workbench inclination correcting operation means and the inclination angle detection means. By correcting the inclination of the work table, the worker can return the inclined work table to the horizontal state only by operating the work table inclination horizontal operation means, thereby preventing an increase in the labor of the worker. Also, the inclination of the work table can be easily corrected, so that the work environment can be improved by correcting the inclination of the work table. Damage can be prevented, and a decrease in the workability of the worktable can be prevented.

Also, the leveling actuator has an upper leveling cylinder pivotally connected to the tip of the boom,
The boom has a leveling flow path for pivoting a lower leveling cylinder interlocking with the boom raising and lowering operation, and has a leveling flow path for expanding and contracting the upper leveling cylinder in accordance with the expansion / contraction operation of the lower leveling cylinder. A hydraulic oil supply unit for supplying hydraulic oil, and a supply control of the hydraulic oil from the hydraulic oil supply unit to the leveling flow path based on a detection value of the inclination inclination angle detection unit when the workbench inclination correction operation unit is operated. In the case where there is provided a tilt correction control valve for correcting the tilt of the workbench horizontally by operating the workbench, the tilted workbench can be easily leveled by operating the workbench tilt horizontal operation means.

Further, the workbench tilting horizontal operating means is operated when checking the operation of the boom, and is operated when operating the power take-off mechanism for extracting the driving force of the engine which is the driving source of the vehicle body. Power take-off mechanism operating means, storage detecting means for detecting that the boom is stored in the vehicle body, and / or boom operating means for operating the operation of the boom. When any of the above is operated or detected, when the workbench inclination horizontal operation means is operated to correct the workbench inclination horizontally, the inspection can be performed even if the operator does not operate the workbench inclination horizontal operation means. Operation means
When any one of the power take-off mechanism operating means / storage detecting means and the boom operating means is operated or detected, the workbench tilting horizontal operating means operates to level the workbench. The boom can be inspected while the platform is held in a horizontal position, and when the boom is stored in the vehicle body, the platform can be stored in a horizontal position. Prevents interference and overloading of the structure supporting the work table.Because the work table is held horizontally when the boom is activated, the work environment is prevented from deteriorating due to the tilt of the work table. can do.

[Brief description of the drawings]

FIG. 1 is a front view of an aerial work vehicle equipped with a workbench leveling adjustment device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a worktable leveling adjustment device according to one embodiment of the present invention.

FIG. 3 shows a circuit diagram of a prior art worktable leveling adjustment device.

[Explanation of symbols]

Reference Signs List 1 aerial work vehicle (work vehicle) 3 body 13 telescopic boom (boom) 19 lower leveling cylinder 25 work table 27 upper leveling cylinder (leveling actuator) 40 work table leveling adjusting device 43 leveling flow path 47 hydraulic pump (actuator operation control means) , Hydraulic oil supply means) 49 Incline correction control valve (actuator operation control means) 51 Switching valve (actuator operation control means, inclination correction control valve) 53 Controller (actuator operation control means) 55 Angle sensor (inclination angle detection means) 59 Work Table tilt horizontal operation switch (work table tilt horizontal operation means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F333 AA08 AB04 BB09 BD02 BE02 FA17 FD07 FE04 FH08

Claims (3)

[Claims] A workbench provided at a tip end of a boom movably provided on a vehicle body so as to be vertically swingable;
A worktable leveling adjustment device for a work vehicle having a leveling actuator that swings the worktable in a vertical direction regardless of the operation of raising and lowering the boom to level the worktable, wherein the worktable is tilted from a horizontal position. Inclination angle detection means for detecting an angle; work table inclination correction operation means operated for correcting the inclination of the work table; and the leveling actuator based on signals from the work table inclination correction operation means and the inclination angle detection means. And an actuator operation control means for adjusting the operation amount of the work table so as to correct the inclination of the work table so as to level the work table. 2. The leveling actuator according to claim 1, wherein the leveling actuator has an upper leveling cylinder pivotally connected to a tip end of the boom, and the boom is pivotally connected to a lower leveling cylinder interlocking with an up / down operation of the boom. A leveling flow path for expanding and contracting the upper leveling cylinder in accordance with the expansion / contraction operation of the actuator, the actuator operation control means includes a hydraulic oil supply means for supplying hydraulic oil to the leveling flow path, and the workbench inclination correcting operation Tilt correction for controlling the supply of hydraulic oil from the hydraulic oil supply means to the leveling flow path based on the detection value of the tilt angle detection means to correct the inclination of the work table horizontally when the means is operated The workbench leveling adjustment device for a work vehicle according to claim 1, further comprising a control valve. 3. An inspection operation means operated when inspecting the operation of the boom, wherein the workbench inclination adjustment operation means is operated,
Power take-off mechanism operating means for operating a power take-off mechanism for extracting a driving force of an engine which is a driving source of the vehicle body, storage detecting means for detecting that the boom is stored in the vehicle body, and It is configured to operate in conjunction with at least one of the boom operation means for operating the operation of the boom,
When any one of the inspection operation means, the power take-off mechanism operation means, the storage detection means, and the boom operation means is operated or detected, the work table inclination adjustment operation means is operated to tilt the work table. 3. The worktable leveling adjustment device for a work vehicle according to claim 1, wherein the worktable is corrected horizontally.