JP2002096992A - Workbench storing device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always support a workbench certainly by a workbench receiver, which is in a state of having proper supporting force without depending on a visual check of a worker. SOLUTION: This work stand storing device comprises a workbench receiver 33 composed of a placing stand 59 provided so as to vertically move and putting a workbench 23 thereon, and a damper 61 generating supporting force which increases according to downward movement of the placing stand 59 when the workbench 23 is putted on the placing stand 59; a supporting force detecting sensor for detecting the strength of the supporting force by the damper 61 when the workbench 23 is putted on the placing stand 59; and a supporting force controlling circuit for actuating an upper leveling cylinder so as to suppress the supporting force detected by the supporting force detecting sensor within a specified range, when an expanding boom is stored in a vehicular body and the workbench 23 is putted on the placing stand 59.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench storage device for a work vehicle, and more particularly, to a workbench provided at the end of a telescopic boom so as to be able to swing at least vertically.
The present invention relates to a workbench storage device for a work vehicle having a workbench receiver provided on a vehicle body for storing and supporting a workbench.

[0002]

2. Description of the Related Art An aerial work vehicle includes a swivel provided at a rear portion of a vehicle body so as to be freely rotatable, a telescopic boom provided at the swivel so as to be able to move up and down, and a leveling mechanism at a tip of the telescopic boom. And a worktable on which the operator can board. In this aerial work vehicle, a vertical post is provided at the tip of the telescopic boom so as to be swingable in the vertical direction, and a multi-joint arm that is swingable in the horizontal direction is pivotally connected to the tip of the vertical post. A work table is provided at the tip of the arm. The leveling mechanism is pivotally connected between the vertical post and the distal end of the telescopic boom, and has a leveling cylinder that holds the vertical post in a vertical state regardless of the elevation angle of the telescopic boom.

Further, this aerial work vehicle has a driving cabin at the front of the vehicle body, and a boom receiver for storing and supporting a telescopic boom that is protruded upward and falls down is provided substantially at the center of the front of the vehicle body behind the driving cabin. A workbench support for mounting and supporting the workbench is mounted on the vehicle body in front of the boom receiver. The workbench receiver has a support member protruding upward from the vehicle body, a mounting table provided movably along the up and down direction on an upper portion of the support member, and a worktable provided in the support member and mounted on the mounting table. And a biasing means such as a damper for moving the mounting table up and down in accordance with the magnitude of the vertical load acting downward through the mounting table and supporting the mounting table with a predetermined supporting force. ing.

[0004] The leveling cylinder normally operates in conjunction with the up / down operation of the telescopic boom, but is also configured so that the telescopic movement of the leveling cylinder can be operated by operating an operating device provided on the workbench. I have. Therefore, when the work table is stored on the mounting table, the tilt of the work table can be adjusted by manually operating the operation device.

[0005]

However, since the determination as to whether or not the workbench has been placed on the mounting table is made visually by the operator, the workbench is mounted on the mounting table with insufficient supporting force. When the vehicle is run while the vehicle is kept in the state, the work table floats from the mounting table, and a large load repeatedly acts on the distal end portion of the telescopic boom and the work table, thereby causing fatigue of the distal end portion of the telescopic boom and the work table. In addition, when a load is mounted on the workbench, there is a problem that members such as the tip of the telescopic boom increase fatigue.

The present invention has been made in view of such a problem, and a work table is always and surely mounted on a work table receiver with proper support force without relying on visual observation of an operator. It is an object of the present invention to provide a workbench storage device for a work vehicle which can be used.

[0007]

In order to solve the above-mentioned problems, a workbench storage device for a work vehicle according to the present invention is provided with a boom (for example, a telescopic boom 11 in the embodiment) provided at least on a vehicle body so as to be able to move up and down. A vertical member (e.g., a vertical post 19 in the embodiment) provided at the tip of the boom so as to be swingable in the vertical direction, and a vertical member irrespective of the boom angle which is pivotally connected between the vertical member and the boom. A leveling cylinder (for example, the upper leveling cylinder 31 in the embodiment) for holding the member in a vertical state, a work table attached to the vertical member, and a work table provided on the vehicle body when the boom is stored in the vehicle body. Workbench storage support means (for example, workbench receiver 3 in the embodiment)
And 3) a workbench storage device for a work vehicle having:

The workbench storage support means of the workbench storage device is provided movably in the up and down direction, on which the workbench is placed, and which urges the workbench upward, and places the workbench on the workbench. And a support means (for example, a damper 61 in the embodiment) for generating a supporting force that increases when the mounting table is moved downward. A supporting force detecting means (for example, a supporting force detecting sensor 75 in the embodiment) for detecting a magnitude of a supporting force of the mounting table by the supporting means when the work table is mounted on the mounting table; A support force control unit (e.g., a control unit that controls the leveling cylinder to operate such that the support force detected by the support force detection unit falls within a predetermined range when the work table is stored and the work table is mounted on the mounting table. , Embodiment Configuring and a definitive supporting force control circuit 83).

Here, as the supporting means, for example, a damper provided with a biasing means such as a spring can be exemplified.

According to the workbench storage device having the above structure, when the boom is housed in the vehicle body and the workbench is placed on the workbench, the support force control means detects the support force detected by the support force detection means. Since the operation of the leveling cylinder is controlled so that the force falls within a predetermined range, when the work table is stored on the mounting table, the work table can be stored while being supported by the support force within the predetermined range. Even when the vehicle travels in such a state, the risk of fatigue of the tip of the boom supporting the worktable and the worktable can be prevented.

According to another aspect of the present invention, there is provided a workbench storing device for a work vehicle, comprising: a boom provided on a vehicle body so as to be able to move up and down at least; The present invention relates to a workbench storage device for a work vehicle having a workbench attached and workbench storage support means provided on a vehicle body for storing and supporting the workbench. And the workbench storage support means of this workbench storage device is provided movably in the up and down direction, a workbench for mounting the workbench,
Mounting table moving means for supporting the mounting table by moving it in the vertical direction (for example, the work table receiving cylinder 91 in the embodiment)
Further, the workbench storage device further includes a support force detection unit (A) configured to detect a magnitude of the support force of the mounting table by the mounting table moving unit when the work table is mounted on the mounting table. For example, the moment detection sensor 9 in the embodiment
4) operating the mounting table moving means so that the supporting force detected by the supporting force detecting means falls within a predetermined range when the boom is stored in the vehicle body and the work table is mounted on the mounting table. And a supporting force control means (for example, the lifting / lowering operation control circuit 93 in the embodiment) for performing the control to make the control.

Here, the mounting table moving means can be exemplified by an elevating cylinder for moving the mounting table in the vertical direction.

According to the workbench storage device having the above structure, when the boom is stored in the vehicle body and the workbench is mounted on the mounting table, the support force control means detects the support force detected by the support force detection means. Since the control for operating the mounting table moving means is performed so that the force falls within the predetermined range, the work table can be supported by the support force within the predetermined range. It is possible to prevent the tip of the boom supporting the table and the work table from becoming fatigued.

Further, in the workbench storage device having the above-described structure, an alarm means (for example, the alarm lamp 89 in the embodiment) which performs an alarm operation when the magnitude of the supporting force detected by the supporting force detecting means is out of the predetermined range. , An operation regulation alarm circuit 90) may be provided. When the magnitude of the supporting force detected by the supporting force detecting means is out of the predetermined range, the alarm means performs an alarm operation, so that the worker knows that the workbench is supported by insufficient supporting force. Therefore, it is possible to prevent the boom and the workbench from being fatigued by running the vehicle with insufficient supporting force.

Here, in this specification, the alarm operation means an operation including an operation of restricting the operation of a jack for lifting and supporting the vehicle body, and an operation of performing an alarm using an alarm buzzer, an alarm lamp, and the like. And, therefore, the worker notices that the platform is poorly supported,
The work table can be supported with a sufficient supporting force.

Further, in the workbench storage device having the above-described configuration, a jack (for example, the outrigger jack 7 in the embodiment) provided on the vehicle body for lifting and supporting the vehicle body, and jack operating means (for example, jack operating means) for operating the jack are provided. Jack operating device 85 in the embodiment)
And a jack operation restricting means for restricting the retracting operation of the jack when the jack operating means performs the storing operation of the jack when the magnitude of the supporting force detected by the supporting force detecting means is out of the predetermined range. , The operation restriction alarm circuit 90) in the embodiment.

According to the workbench storage device having the above-described structure, when the jack operation is performed by the jack operating means when the magnitude of the supporting force detected by the supporting force detecting means is out of the predetermined range, the jack is operated. Since the regulating means regulates the storage operation of the jack, the worker notices that the work table is not supported by the support force within the predetermined range, and before the jack is stored, the work table is always and surely properly adjusted. It can be made to be supported by the supporting force.

[0018]

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 pivotable on a vehicle body, and a worktable that is pivotally provided at the tip of the telescopic boom.

[0019]

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. First, before describing the workbench storage device of the present invention, an aerial work vehicle equipped with the workbench storage device will be described. As shown in FIG. 1, the aerial work vehicle 1 has a driving cabin 5 at the front of the vehicle body 3 and outrigger jacks 7 at the left and right sides of the front and rear of the vehicle body behind the driving cabin 5. are doing. A swivel 9 that projects upward and is capable of swiveling is attached to the rear of the vehicle body, and a swivel motor 10 that swings the swivel 9 is installed in the vehicle body 3 below the swivel 9. When the turning motor 10 is operated, the turning table 9 is turned.

A base of a telescopic boom 11 is pivotally connected to the upper part of the swivel table 9 so as to be vertically swingable. An up-and-down cylinder 13 is pivotally connected between a lower surface of the telescopic boom 11 and an intermediate part of the swivel table 9. Have been. The telescopic boom 11 is configured to move up and down when the up and down cylinder 13 expands and contracts. Further, a telescopic cylinder 15 is built in the telescopic boom 11, and the telescopic boom 11 is configured to be telescopically moved when the telescopic cylinder 15 is telescopically moved. A lower leveling cylinder 1 is provided between the lower surface of the telescopic boom 11 on the base side of the telescopic boom with respect to the up-and-down cylinder 13 and the upper part of the swivel base 9.
7 is articulated. The lower leveling cylinder 17 is configured to extend and contract in conjunction with the up and down movement of the extendable boom 11.

A vertical post 19 pivotally connected to the vertical end of the telescopic boom 11 is attached to the vertical end of the telescopic boom 11 so as to be vertically swingable. An articulated arm 21 pivotally connected is attached. A horizontal turning motor (not shown) is built in the base of the multi-joint arm 21, and the multi-joint arm 21 is configured to turn with respect to the vertical post 19 when the horizontal turning motor operates. Articulated arm 19
As shown in FIG. 1, a workbench elevating device 22
A worktable 23 connected via the oscillating head is swingably mounted. A swing motor (not shown) is built in the upper part of the workbench elevating device 22, and the workbench 23 is configured to swing with respect to the tip of the articulated arm 21 by driving the swing motor. I have. The workbench elevating device 22 has a function of moving the workbench 23 up and down, and when the workbench 23 is stored, the workbench 23 moves to the lowest position within the working range of the workbench elevator 22. (Hereinafter, this position is referred to as a “storage preparation position”), and the horizontal position of the front end of the telescopic boom 11 (hereinafter, referred to as “storage preparation position”) is activated by the operation of the horizontal swing motor and the swinging motor.
This will be referred to as “workbench storage position”. ). As shown in FIG. 2, a boom operating device 27 for rotating, raising and lowering, and extending and retracting the telescopic boom 11 is provided on the work table 23, and an operation for rotating, swinging, and raising and lowering the work table 23. A table operating device 28 is attached, and when the boom operation lever 27a of the boom operating device 27 is manually operated, the telescopic boom 11 is configured to pivot, move up and down, and expand and contract. When the operation lever 28a is manually operated, the worktable 23 is configured to pivot, swing, and move up and down.

As shown in FIG. 1, a telescopic boom 11 protrudes upward from the front of the vehicle body on the vehicle rear side of the driving cabin 5.
Is mounted.
The boom receiver 25 has a bar-shaped boom support member 25a projecting upward from the vehicle body 3, and a boom contact member 25b attached to an upper portion of the boom support member 25a and supporting the lower surface of the telescopic boom 11 by contact. It is configured.

Next, the workbench storage device 30 will be described. As shown in FIG. 1, the workbench storage device 30 includes an upper leveling cylinder 31, a workbench receiver 33, and a support force control device 70 shown in FIG. The upper leveling cylinder 31 is pivotally connected between the distal end of the telescopic boom 11 and the lower part of the vertical post 19. As shown in FIG. 3, the upper leveling cylinder 31 and the lower leveling cylinder 17 are provided in a hydraulic circuit 35, and the hydraulic circuit 35 has a leveling oil passage 37 and an adjusting oil passage 39. The leveling oil passage 37 is connected to the upper leveling cylinder 31.
And each rod chamber 31a, 1 of the lower leveling cylinder 17
It has a rod flow path 41 communicating between 7a, and a bottom flow path 43 communicating between the bottom chambers 31b, 17b of the upper leveling cylinder 31 and the lower leveling cylinder 17. Therefore, the undulating cylinder 13 shown in FIG.
When the lower leveling cylinder 17 expands and contracts in conjunction with the expansion and contraction of the upper leveling cylinder 31, the upper leveling cylinder 31 expands and contracts. The adjustment oil passage 39 is connected to the rod passage 41
And a second supply oil passage 51 branched from the bottom passage 43 and connected to a second switch valve 49. Have been. A first relief valve 53 is connected to the first supply oil passage 47 and communicates with the tank T, and a second relief valve 55 is connected to the second supply oil passage 51 and communicates with the tank T.

Here, the first switching valve 45 and the second switching valve 4
Reference numeral 9 denotes an electromagnetic switching valve, and the solenoids 45a, 49a
ON / OFF control (excitation / non-excitation) controls the supply / discharge of the hydraulic oil discharged from the hydraulic pump P to / from the leveling flow path 37. More specifically, when the solenoid 45a of the first switching valve 45 is excited, hydraulic oil is supplied to the rod flow path 41 of the leveling oil passage 37, and when the solenoid 49a of the second switching valve 49 is excited, the operating oil is activated. Oil leveling oil passage 37
Is configured to be supplied to the bottom channel 43.

The work platform support 33 is provided on the vehicle body 3 between the boom support 25 and the driving cabin 5 shown in FIG. 1, and as shown in FIG. 57, a mounting table 59 movably provided in the vertical direction above the work table support member 57, and a damper 61 for moving the mounting table 59 in the vertical direction.

The mounting table 59 has a cylindrical fitting portion 59a fitted to the upper part of the work table support member 57 in the radial direction and a fitting portion 5a.
And a plate-shaped mounting portion 59b connected to the upper portion of 9a for mounting the workbench 23. The bottom side bottom portion of the damper 61 is pivotally connected to a first holding member 63 which is horizontally attached to a lower portion in the workbench support member 57, and
Is connected to a second holding member 65 mounted horizontally inside the upper part of the fitting portion 59a.

The expansion and contraction of the upper leveling cylinder 31 shown in FIG. 1 is controlled by a supporting force control device 70 shown in FIG. The supporting force control device 70 is a device for supporting the worktable 23 on the mounting portion 59b with an appropriate supporting force. As shown in FIG. 5, the support force control device 70 includes a boom storage detection sensor 71, a workbench storage detection sensor 73, a support force detection sensor 75, and a controller 77.
The boom storage detection sensor detects whether or not the lower surface of the telescopic boom 11 is in contact with the boom contact member 25b of the boom receiver 25 shown in FIG. It is attached to the contact member 25b. The workbench storage detection sensor 73 detects whether the workbench 23 is in contact with the mounting portion 59b shown in FIG.
S (limit switch) is attached to the mounting portion 59b. The support force detection sensor 75 detects the magnitude of the support force F that the damper 61 shown in FIG. 4 supports by supporting the mounting table 59 upward, and pivotally connects the lower end of the damper 61 and the first holding member 63. This is a load cell attached to the load detection pin 79.

The controller 77 is a workbench storage determination circuit 8
1, a support force determination circuit 82 and a support force control circuit 83. The workbench storage determination circuit 81 detects that the telescopic boom 11 shown in FIG. 1 has been stored in the boom receiver 25 by the boom storage detection sensor 71, and the workbench storage detection sensor 73 causes the workbench 23 shown in FIG. 5
When it is detected that the work table 23 is placed on the work table 9b, it is determined that the workbench 23 is in the storage state. The support force determination circuit 82 determines whether or not the support force detected by the support force detection sensor 75 is within a predetermined range when the workbench 23 is in the stored state by the workbench storage determination circuit 81. It has the function of determining. When the supporting force determination circuit 82 determines that the supporting force is not within the predetermined range, the supporting force control circuit 83 controls the first switching valve 45 so that the supporting force detected by the supporting force detection sensor 75 falls within the predetermined range. And the operation of the second switching valve 49 is controlled. Further, when the support force control circuit 83 determines that the support force detected by the support force determination circuit 82 is within the predetermined range, the first switching valve 45 and the second switching valve 49 of the solenoids 45a and 45a shown in FIG. 49a is controlled to be OFF (to be de-energized). Note that the supporting force control circuit 83
The switching valve 45 and the second switching valve 49 are electrically connected.

Next, the operation of the workbench storage device 30 of the present invention will be described for a case where the workbench 23 is stored in the workbench receiver 33. First, as shown in FIG.
After the operator in the vehicle operates the boom operation lever 27a of the boom operating device 27 to reduce and move the telescopic boom 11 to the fully contracted state, the swivel 9 is pivoted to move the telescopic boom 11 to the boom receiver 25. To move upward. And
When the operator operates the platform operating lever 28a of the platform operating device 28,
Is operated to pivot the articulated arm 21 and swing the work table 23 to move the work table 23 to the work table storage position. Then, the worker operates the workbench operating lever 28a.
To operate the workbench elevating device 22 shown in FIG. 1 to move the workbench 23 to the storage preparation position.

When the workbench 23 moves to the workbench storage position and the storage preparation position, and the telescopic boom 11 moves above the boom receiver 25, the operator operates the boom operation lever 27a of the boom operation device 27 to extend and retract. The boom 11 is moved down and down, the telescopic boom 11 is placed on the boom contact member 25b of the boom receiver 25, and the telescopic boom 11 is stored. The receiver 33 is placed on the receiver 59b. here,
When the up-and-down cylinder 13 is contracted to make the telescopic boom 11 moved above the boom receiver 25 shown in FIG. 1 fall down, as shown in FIG.
Moves in conjunction with the contraction movement of the up-and-down cylinder 13. As a result, the upper leveling cylinder 31 extends and moves through the leveling oil passage 37, and as shown in FIG.
9 is maintained in a vertical state, and the work table 23 is maintained in a horizontal state.

As shown in FIG. 4, when the workbench 23 is placed on the workbench 59b of the workbench receiver 33, the workbench 59 moves downward and urges the workbench 59 upward. Mounting table 59
The support force which increases with respect to the downward movement acts on the mounting table 59 from the damper 61. When the telescopic boom 11 shown in FIG.
Stops moving downward, and the supporting force F of the damper 61 is stopped.
The workbench 23 is supported by the workbench support 33 in a state in which it has been received.

Here, the telescopic boom 11 is connected to the boom receiver 25.
When the workbench 23 is placed on the worktable 59, the boom storage detection sensor 71 detects that the telescopic boom 11 has been stored in the boom receiver 25, as shown in FIG. The detection sensor 73 detects that the workbench 23 has been stored in the workbench receiver 33, and these detection signals are sent to the workbench storage determination circuit 81 of the support force control circuit 70. The workbench storage determination circuit 81 determines that the workbench 23 shown in FIG. 4 has been stored in the workbench receiver 33 according to these detection signals, and sends the determination result to the support force determination circuit 82. When receiving the stored signal of the workbench 23, the support force determination circuit 82 determines whether or not the detection value from the support force detection sensor 75 is within a predetermined range, whether the detection value is beyond the predetermined range, and is below the predetermined range. It is determined whether or not.

The support force determination circuit 82 is provided with a support force detection sensor 7
It is determined that the detected value from 5 is within the predetermined range, and the result is sent to the supporting force control circuit 83. When receiving the determination result that the supporting force is within the predetermined range, the supporting force control circuit 83 sets the solenoids 45a and 49a of the first switching valve 45 and the second switching valve 49 to the non-excited state, as shown in FIG. Let it. As a result, the hydraulic oil discharged from the hydraulic pump P is not supplied to the leveling oil passage 37, so that the upper leveling cylinder 3
No. 1 does not operate and is kept stopped. For this reason, the worktable 23 can be held in a state where it is supported by a support force within a predetermined range. Further, even if the vehicle travels in this state, there is no possibility that a large repetitive force acts on the distal end portion of the telescopic boom 11 that supports the work table 23 and the components that make up the work table 23, and the fatigue of these parts increases. It is possible to suppress the risk of being caused.

Next, an operation when the magnitude of the supporting force of the damper 61 exceeds a predetermined range when the work table 23 shown in FIG. 4 is placed on the work table support 33 will be described.
When the support force determination circuit 82 shown in FIG. 5 determines that the magnitude of the support force exceeds the predetermined range, based on the determination result, the support force control circuit 83 performs, as shown in FIG. A control signal for energizing the solenoid 45a of the first switching valve 45 and a control signal for deactivating the solenoid 49a of the second switching valve 495 are output. As a result, the hydraulic oil discharged from the hydraulic pump P is supplied to the rod flow path 41 of the leveling oil path 37, and a part of the hydraulic oil is supplied to the lower leveling cylinder 17.

However, since the up-and-down cylinder 13 shown in FIG. 1 is in a stopped state (a state in which expansion and contraction is restricted), expansion and contraction of the lower leveling cylinder 17 is restricted. For this reason, the hydraulic oil discharged from the hydraulic pump P is supplied to the rod chamber 31a of the upper leveling cylinder 31,
The force in the direction of contracting and moving the upper leveling cylinder 31 acts on the rod 31c to increase the pressure of the hydraulic oil in the bottom channel 43. When the pressure of the hydraulic oil acting on the second relief valve 55 communicating with the bottom flow path 43 exceeds a predetermined value, the second relief valve 55 is opened, and the operation in the bottom chamber 31 b of the upper leveling cylinder 31 is started. Reduce oil pressure. As a result, the upper leveling cylinder 31 shrinks, the tip of the worktable 23 shown in FIG. 1 swings upward, the mounting table 59 rises, and the supporting force of the worktable 23 by the damper 61 shown in FIG. It decreases and falls within a predetermined range.

When the supporting force falls within the predetermined range, the supporting force determining circuit 82 determines that the supporting force is within the predetermined range, as shown in FIG.
3, the supporting force control circuit 83 deactivates the solenoid 45a of the first switching valve 45 shown in FIG. 3 based on the determination result, and stops the contraction movement of the upper leveling cylinder 31. As a result, the expansion and contraction movement of the upper leveling cylinder 31 is held in a stopped state, and the state in which the supporting force is within a predetermined range is maintained. Therefore, the work table 23 can be held by the work table support 33 in a state where the work table 23 is supported by a support force within a predetermined range.

Next, a case where the supporting force is less than the predetermined range will be described. When it is determined by the supporting force determination circuit 82 shown in FIG. 5 that the magnitude of the supporting force is smaller than the predetermined range, the supporting force control circuit 83 is performed based on the determination result.
Outputs a control signal for exciting the solenoid 49a of the second switching valve 49 shown in FIG.
A control signal for causing the solenoid 45a to be in a non-excited state is output. As a result, the hydraulic oil discharged from the hydraulic pump P is supplied to the bottom flow path 43 of the leveling oil path 37 via the second switching valve 49, and a part of the hydraulic oil is supplied to the lower leveling cylinder 17.

However, since the up-and-down cylinder 13 shown in FIG. 1 is in a stopped state (a state in which the expansion and contraction is restricted), the expansion and contraction of the lower leveling cylinder 17 is restricted. Is supplied to the bottom chamber 31b of the upper leveling cylinder 31. As a result, the force in the direction of extending the upper leveling cylinder 31 acts on the rod 31 c to increase the pressure of the hydraulic oil in the rod passage 41, and acts on the first relief valve 53 communicating with the rod passage 41. When the pressure of the operating oil exceeds a predetermined value, the first relief valve 53 opens to reduce the pressure of the operating oil in the lock chamber 31a of the upper leveling cylinder 31. As a result, the upper leveling cylinder 31 extends and swings, and the tip of the worktable 21 shown in FIG.
When the mounting table 59 shown in FIG. 4 is pressed downward, the supporting force of the work table 23 by the damper 61 increases and falls within a predetermined range.

When the supporting force falls within the predetermined range, as shown in FIG. 5, the supporting force determining circuit 82 determines that the supporting force is within the predetermined range.
3, the supporting force control circuit 83 deactivates the solenoid 49a of the second switching valve 49 shown in FIG. 3 based on the determination result, and stops the extension movement of the upper leveling cylinder 31. As a result, the expansion and contraction movement of the upper leveling cylinder 31 is held in a stopped state, and the state in which the supporting force is within a predetermined range is maintained. For this reason, the workbench 23 can be held by the workbench receiver 33 in a state where the workbench 23 is supported by a support force within a predetermined range.

In the above embodiment, the work table 23
Is shown on the workbench support 33 with a proper support force, but when the workbench 23 is not supported by the workbench storage device 30 with a proper support force, FIG.
Can be added, and an alarm function for turning on an alarm lamp can be added.

In this case, as shown in FIG. 6, the controller 70 is connected to a jack operating device 85 for performing the operation of extending and storing the outrigger jack 7 shown in FIG. The controller 70 includes the jack operating device 8.
The operation control circuit 87 that controls the operation of the jack control valve 86 that controls the operation of the jack cylinder 8 built in the outrigger jack 7 according to the operation content of the operation 5 and whether the operation content of the jack operation device 85 is a storage operation. There is further provided a storage operation determination circuit 88 for determining whether or not the operation has been performed, and an operation restriction alarm circuit 90 for restricting the operation of the jack cylinder 8 and lighting an alarm lamp 89.

According to the controller 70, the supporting force determining circuit 82 determines that the supporting force is not within the predetermined range, and the storing operation determining circuit 88 determines that the operation content of the jack operating device 85 is the storing operation. In this case, the operation control alarm circuit 90 is operated, and the jack control valve 8 of the operation control signal sent from the operation control circuit 87 is operated.
6 and the alarm lamp 89 is turned on. For this reason, the worker notices that the work table 23 is supported by an inappropriate supporting force, so that the storage operation of the work table 23 can always and reliably be performed before the storage operation of the outrigger jack 7. .

[0043]

Second Embodiment Next, a second embodiment of the workbench storage device of the present invention will be described with reference to FIGS. 1, 4, 7, 8, and 9. FIG. In the second embodiment, only differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. The workbench support 33 is provided with a workbench support cylinder 91 that can expand and contract vertically, instead of the damper 61 shown in FIG. The rod end of the work table receiving cylinder 91 is pivotally connected to the second holding member 65, and the bottom end of the work table receiving cylinder 91 is connected to the first holding member 63. The controller 77 is shown in FIG.
As shown in FIG. 7, a moment determination circuit 92 and a lifting / lowering operation control circuit 93 are provided, and a moment detection sensor 94 is electrically connected to the moment determination circuit 92.

The moment detecting sensor 94 has a function of detecting a moment acting on a bucket pin 95 which connects the vertical post 19 to the tip of the telescopic boom 11 shown in FIG. The moment determination circuit 92 has a function of determining whether or not the moment value detected by the moment detection sensor 94 is within an allowable range that does not adversely affect the tip of the telescopic boom 11. Note that the allowable range that does not adversely affect the tip of the telescopic boom 11 is a value set in consideration of the upper limit value (fatigue limit) of the stress that does not cause the tip of the telescopic boom 11 and the components of the worktable 23 to be fatigued. Can be used. The elevating operation control circuit 93 detects that the telescopic boom 11 has been stored in the boom receiver 25 by the boom storage detection sensor 71, and that the workbench 23 has been stored in the workbench receiver 33 by the workbench storage detection sensor 73, and When the storage operation determination circuit 88 determines that the operation content of the jack operating device 85 is a storage operation, the work table receiving cylinder 91 is extended and the moment value detected by the subsequent moment determination circuit 94 is When it is determined that it is within the allowable range, the extension movement of the workbench receiving cylinder 91 is stopped.

The expansion and contraction of the work table receiving cylinder 91 is controlled by a work table receiving first switching valve 96 and a work table receiving second switching valve 97. As shown in FIG. 8, the work platform receiving first switching valve 96 is an electromagnetic two-position switching valve, and is supplied from the jack control valve 86 when the solenoid 96a of the work platform receiving first switching valve 96 is excited. The working oil is supplied to the bottom chamber 91b of the work table receiving cylinder 91 to extend the work table receiving cylinder 91. On the other hand, the workbench receiving first switching valve 9
When the sixth solenoid 96a is de-energized, the supply of hydraulic oil supplied from the jack control valve 86 to the bottom chamber 91b is shut off. A workbench receiving second switching valve 97 is provided in an oil passage between the workbench receiving first switching valve 96 and the bottom chamber 91b of the workbench receiving cylinder 91. The workbench receiving second switching valve 97 is an electromagnetic two-position switching valve, and when the solenoid 97a is excited, the workbench receiving cylinder 9
The first bottom chamber 91b communicates with the tank T and
b to reduce the pressure of the hydraulic oil in the workbench receiving cylinder 9
Move 1 down. On the other hand, when the solenoid 97a of the workbench receiving second switching valve 97 is de-energized, the workbench receiving first switching valve 96 and the bottom chamber 91 of the workbench receiving cylinder 91 are turned off.
b are configured to communicate with each other. The rod chamber 91a of the workbench receiving cylinder 91 has a workbench receiving first switching valve 9
6, and is connected to a hydraulic circuit (not shown).

According to the workbench storage device of the second embodiment, the telescopic boom 11 is detected by the boom storage detection sensor 71 shown in FIG. When it is detected that the platform 23 has been stored in the workbench support 33 and the storage operation determination circuit 88 determines that the storage operation of the outrigger jack 7 has been performed, the elevation operation control circuit 93 operates as shown in FIG.
, The solenoid 96a of the workbench receiving first switching valve 96 is excited, and the solenoid 97a of the workbench receiving second switching valve 97 is de-energized, so that the operating oil supplied from the jack control valve 86 is supplied to the workbench. It is supplied to the bottom chamber 91b of the receiving cylinder 91. As a result, the workbench receiving cylinder 9
1 extends.

When the work table receiving cylinder 91 extends,
As shown in FIG. 4, the mounting table 59 is raised to increase the supporting force of the work table 23 supported on the mounting table 59. Here, when the work table 23 is supported on the mounting table 59, the moment acting around the bucket pin 95 shown in FIG. 1 depends on the weight of the work table itself between the center of gravity of the work table 23 and the bucket pin 95. A value obtained by subtracting a support moment obtained by multiplying the work table moment multiplied by the distance by the support force of the work table 23 supported on the mounting table 59 by the distance between the position where the support force is applied and the bucket pin 95 is obtained, This moment is detected by the moment detection sensor 94. Then, based on the detected moment, the moment determining circuit 92 shown in FIG. 7 determines that it is within the allowable range, and the lifting / lowering operation control circuit 93 sets the solenoid 96a of the workbench receiving first switching valve 96 to the non-excited state. Switch to the workbench receiving cylinder 9
Cut off the supply of hydraulic oil to 1. As a result, the extension movement of the workbench receiving cylinder 91 is held in the stopped state.

As described above, by controlling the extension movement of the workbench receiving cylinder 91, the moment acting on the distal end of the telescopic boom 11 can be made constant, and the distal end of the telescopic boom 11 and the workbench 23 can be controlled. Can suppress the fatigue of the components constituting the device. Further, even when a load or the like is placed on the work table 23, the moment acting around the bucket pin 95 can be kept at a constant value, so that the vehicle can run even when the load is mounted on the work table 23. be able to. In order to reduce the extended work platform receiving cylinder 91, the solenoid 97a of the work platform receiving second switching valve 97 shown in FIG. 8 is excited. As a result, the bottom chamber 91b of the worktable receiving cylinder 91 communicates with the tank T, the pressure of the hydraulic oil in the bottom chamber 91b decreases, and the worktable receiving cylinder 91 contracts due to the weight of the mounting table 59.

In the above-described embodiment, an example is shown in which the moment detection sensor 94 shown in FIG. 7 is connected to the controller 77. However, the present invention is not limited to this.
When the work table receiving cylinder 91 detects the magnitude of the support force for supporting the work table 23 via the work table 59 when the device
7 can be connected. When using the support force detection sensor, the lifting / lowering operation control circuit 93 sets the work platform support first switching valve 96 and the work platform support second switch so that the detection value detected by the support force detection sensor falls within a predetermined range. Valve 9
7, the extension movement of the work table receiving cylinder 91 is controlled.

That is, when the detected value of the supporting force is smaller than the predetermined range, the elevating operation control circuit 93 shown in FIG.
The solenoid 96a of the workbench receiving first switching valve 96 shown in FIG.
a is turned off. When the detected value of the supporting force falls within a predetermined range, the solenoid 96a of the workbench receiving first switching valve 96 is de-energized and the workbench receiving cylinder 9 is turned off.
1 is kept in a stopped state.

In the above-described second embodiment, when the workbench 23 is mounted on the workbench support 33, the workbench is stored such that the moment acting on the tip of the telescopic boom 11 falls within an allowable range. When the moment is out of the allowable range, the operation of the outrigger jack 7 is restricted and the alarm lamp 89 is provided.
An alarm function for turning on can be added.

In this case, as shown in FIG. 9, the controller 77 is further provided with an operation restriction alarm circuit 90 for restricting the operation of the jack cylinder 8 and lighting the alarm lamp 98. An alarm lamp 98 and a jack control valve 86 are electrically connected to an operation restriction alarm circuit 90.

According to the controller 77, it is determined by the moment determination circuit 92 that the moment value detected by the moment detection sensor is not within the predetermined range, and the operation content of the jack operating device 85 is stored by the storage operation determination circuit 88. When it is determined that the operation control alarm circuit 90 is operated, the operation control alarm circuit 90 is operated to interrupt the transmission of the operation control signal sent from the operation control circuit 87 to the jack control valve 86 and to turn on the alarm lamp 98. For this reason, the worker notices that an inappropriate moment is acting on the telescopic boom 11, so that the retracting operation of the work table 23 is always and reliably performed before the retracting operation of the outrigger jack 8 is performed. Can be.

In the above-described embodiment in which the workbench 23 moves up and down with respect to the telescopic boom 11, the boom storage detection sensor 71 detects that the telescopic boom 11 has been stored on the boom receiver 25 during storage. Sometimes workbench 2
3 is raised upward, the workbench 2
3 is not stored, and the workbench storage detection sensor 73 cannot detect storage. In such a case, an alarm can be issued or the storage of the jack can be restricted.

[0055]

According to the workbench storage device for a work vehicle according to the present invention, when the boom is stored in the vehicle body and the workbench is placed on the workbench, the support force control means changes the support force detection means. Since the operation of the leveling cylinder is controlled so that the support force detected by the control device falls within a predetermined range, when the work table is stored on the mounting table, the work table is always and surely supported by the support force within the predetermined range. It is possible to prevent the tip of the boom that supports the work table and the work table from becoming fatigued even when the vehicle is running in such a state.

Further, according to the workbench storage device for a work vehicle according to the present invention, when the boom is stored in the vehicle body and the workbench is placed on the workbench, the support force control means detects the support force detection means. Since the mounting table moving means is operated so that the supporting force detected by falls within the predetermined range, the work table can be always and reliably supported by the supporting force within the predetermined range,
Even when the vehicle is run in such a state, it is possible to prevent the tip of the boom supporting the worktable and the worktable from becoming fatigued.

Further, there is provided an alarming means for performing an alarm operation when the magnitude of the supporting force detected by the supporting force detecting means is out of the predetermined range. If the magnitude of the supporting force is out of the predetermined range, the alarming means is activated. When an alarm is activated, the worker will notice that the platform is supported by insufficient support, and the vehicle must travel with the platform supported by insufficient support. Thus, the possibility that the boom and the workbench are fatigued can be prevented.

Further, when the jack operating means performs the storing operation of the jack when the magnitude of the supporting force detected by the supporting force detecting means is outside the predetermined range, the jack operation restricting means controls the storing operation of the jack. In the case of restricting, the worker noticed that the work table was not supported by the support force within the predetermined range, and the work table was always and surely supported by the appropriate support force before the jack was stored. State.

[Brief description of the drawings]

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

FIG. 2 is a plan view of an aerial work vehicle equipped with the workbench storage device according to the first embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram of the workbench storage device according to the first embodiment of the present invention.

FIG. 4 is a front view of a workbench receiver of the workbench storage device according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a workbench storage device according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing a workbench storage device according to the first embodiment of the present invention.

FIG. 7 shows a block diagram of a workbench storage device according to a second embodiment of the present invention.

FIG. 8 shows a hydraulic circuit diagram of a workbench storage device according to a second embodiment of the present invention.

FIG. 9 shows a block diagram of a workbench storage device according to a second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 aerial work vehicle (working vehicle) 3 body 7 outrigger jack (jack) 11 telescopic boom (boom) 19 vertical post (vertical member) 23 work table 30 work table storage device 31 upper leveling cylinder (leveling cylinder) 33 work table Receiver (work table storage and support means) 59 Placement table 61 Damper (support means) 75 Support force detection sensor (support force detection means) 83 Support force control circuit (support force control means) 85 Jack operating device (jack operating means) 89 Alarm Lamp (alarm means) 90 Operation restriction alarm circuit (alarm means, jack operation restriction means) 91 Workbench receiving cylinder (mounting table moving means) 93 Elevation operation control circuit (support force control means) 94 Moment detection means (support force detection means) )

Continuation of the front page F term (reference) 3F333 AA08 AB04 BD02 BE02 CA04 CA15 FA17 FA22 FD06 FE04 FE09

Claims (4)

[Claims] 1. A boom provided at least on a vehicle body so as to be able to move up and down, a vertical member provided at a tip end of the boom so as to be vertically swingable, and a pivot extending between the vertical member and the boom. A leveling cylinder tied to hold the vertical member in a vertical state irrespective of the elevation angle of the boom, a work table attached to the vertical member, and the boom provided on the vehicle body and retracted in the vehicle body A workbench storage device for a work vehicle, comprising: a workbench storage support means for storing and supporting the workbench, wherein the workbench storage support means is provided movably in the up-down direction and mounts the workbench. A mounting table, and a supporting means for urging the mounting table upward to generate a supporting force that increases with respect to the downward movement of the mounting table when the work table is mounted on the mounting table. Having, before A support force detecting unit configured to detect a magnitude of the support force of the mounting table by the support unit when the work table is mounted on the mounting table; and a storage unit that stores the boom in the vehicle body and the work table. And supporting force control means for controlling the operation of the leveling cylinder so that the supporting force detected by the supporting force detecting means falls within a predetermined range when the device is mounted on the mounting table. A workbench storage device for a work vehicle. 2. A boom provided at least on the vehicle body so as to be able to move up and down, a work table mounted on a tip end of the boom so as to be swingable in a vertical direction, and the work table provided on the vehicle body and housed therein. A workbench storage device for a working vehicle, comprising: a workbench storage and support means for supporting the workbench, wherein the workbench storage and support means is provided movably in the vertical direction and mounts the workbench; A mounting table moving means for supporting the mounting table by moving the mounting table in the vertical direction, and the magnitude of the supporting force of the mounting table by the mounting table moving means when the work table is mounted on the mounting table. And a supporting force detecting means for detecting the boom in the vehicle body, and when the work table is placed on the mounting table, the supporting force detected by the supporting force detecting means is within a predetermined range. Described above to fit within And a supporting force control means for controlling the operation of the table moving means. 3. The work system according to claim 1, further comprising an alarm unit that performs an alarm operation when the magnitude of the supporting force detected by the supporting force detecting unit is out of a predetermined range. Workbench storage device for vehicles. 4. A jack provided on the vehicle body for lifting and supporting the vehicle body, jack operating means for operating the driving of the jack, and a magnitude of the supporting force detected by the supporting force detecting means is predetermined. 2. A jack operation restricting means for restricting a storage operation of the jack when the jack is operated by the jack operating means when the jack is out of the range.
Or a workbench storage device for a work vehicle according to 2.