JP2003040588A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a post-leveling cylinder by eliminating the need of re-adjustment of the post-leveling cylinder when a boom is stored. SOLUTION: This vehicle for high lift work comprises a boom allowed to be elevated by an elevating cylinder and supported on a boom rest by falling down in the longitudinal direction of a body, a post allowed to be vertically swung through an extendable arm at the tip of the boom and supported on a post supporter vertically installed on the upper surface of the boom by falling down in longitudinal direction of the body in the state of being folded up in the upper direction of the boom, limit switches 69 and 71 for detecting whether the boom is supported on the boom rest and the post supporter, and a controller 65 for controlling the operation of the elevating cylinder 25 and the post-leveling cylinder 31 so that the boom and the post can be supported on the boom rest and the post supporter according to the detected signals of the limit switches 69 and 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle, and more particularly to an aerial work vehicle referred to as an over-fence vehicle, a bridge inspection vehicle, or the like.

[0002]

2. Description of the Related Art Repair of paint applied to the surface of a bridge (the handrail part where cars and people pass) and the back of the bridge (the back of parts where cars and people pass, the side facing the sea and rivers, etc.) In order to carry out the above, for example, an overfence work vehicle or a work platform for high places called a bridge inspection vehicle having a work platform at the tip of the boom is used.

In this aerial work vehicle, there is a swivel mounted on the vehicle body for horizontal swiveling, a boom mounted on the swivel so that it can move up and down, and swingable vertically at the tip of the boom. A flexion / extension arm attached to the post, a post that is attached to the tip of the flexion / extension arm and is capable of extending and contracting, and a work table that is attached to the tip of the post so that it can swing at least vertically. is there. The boom is stored on the vehicle body by extending it substantially horizontally in the front-rear direction and lying down, and the bending / extending arm is swung to approximately 180 degrees so that the post overlaps with the boom, and is folded and folded onto the vehicle body. The work platform is horizontally retracted, laid down, and stored, and the work table is moved to the side of the boom and stored horizontally.

A leveling cylinder is connected between the tip of the boom and the post, and the hoisting cylinder and the leveling cylinder are configured to expand and contract in conjunction with each other.

[0005]

However, since the boom receiver and the post receiver for supporting the stored boom and the post are not provided on the vehicle body, the post is not in the horizontal state even when the operation of the leveling cylinder is wrong. In some cases, the workbench may be stored in a tilted state as a result. For this reason, it is necessary to adjust the leveling cylinder to make the work table horizontal.

Further, when an aerial work vehicle travels with a boom and a post stored in a vehicle without a boom receiver, when vibration occurs during travel, the boom swings and the undulating cylinder expands and contracts. As a result, the leveling cylinder also tries to expand and contract. However, when the oil passage connected to the leveling cylinder is in a closed state, the leveling cylinder cannot expand and contract, and high pressure oil pressure acts on the inside of the leveling cylinder. The same applies when the post swings. Therefore, the leveling cylinder is required to have high mechanical strength, and as a result, the leveling cylinder becomes heavy, which causes a problem.

The present invention has been made in view of the above problems, and provides an aerial work vehicle that does not require adjustment work for paralleling the leveling cylinders and can reduce the weight of the leveling cylinders. The purpose is to do.

[0008]

In order to solve the above-mentioned problems, an aerial work vehicle of the present invention comprises a vehicle capable of traveling, a swivel mounted on the vehicle body of the vehicle so as to be horizontally rotatable, and a swivel. A boom that is attached to the boom so that it can move up and down, a post that is vertically swingably attached to the tip of the boom, and a work platform that is attached to the tip of the post. It is an aerial work vehicle (for example, an overfence work vehicle 1 in the embodiment) that extends substantially forward and backward and is stored, and includes a boom support and a post that support the boom with the boom and the post stored. A post support that supports the boom, a boom support detection unit that detects whether or not the boom is supported by the boom support (for example, the boom L / S 71 in the embodiment), and whether or not the post is supported by the post support. Either one of the boom and the post is detected by the post support detecting means (for example, the post L / S69 in the embodiment) for detecting and the detection signal of the boom support detecting means and the post support detecting means during the retracting operation of the boom and the post. An operation control means for controlling the operation of the boom or the post such that the unsupported boom or post is supported by the boom receiver or the post receiver when the boom or the post is not supported by the receiver and the post receiver (for example, the controller in the embodiment). 65) and.

According to the aerial work vehicle having the above-mentioned structure, the operation control means controls the operation of the boom or the post so as to support the boom or the post which is not supported. Since it is in a state of being supported by the receiver and the post receiver, this is automatically adjusted even if the leveling operation of the post goes wrong. As a result, leveling adjustment work becomes unnecessary,
It is possible to prevent the deviation of the leveling operation from being accelerated.

In addition, in the aerial work vehicle having the above-mentioned structure, the boom is hoisting and hoisting actuator for hoisting (for example,
The post has a swing actuator (for example, the post leveling cylinder 31 in the embodiment) for swinging, and the operation control unit is configured such that the boom support unit detects the boom support. When it is detected that the post is not supported by the post receiver by the post support detection means,
The operation of the swing actuator is controlled so that the post falls and is supported by the post receiver, and the boom support detecting means detects that the boom is not supported by the boom receiver.
In addition, when the post support detection unit detects that the post is supported by the post receiver, the operation of the hoisting actuator may be controlled so that the boom falls and is supported by the boom receiver.

According to the aerial work vehicle having the above structure, the operation of the hoisting actuator or the swing actuator is controlled so that the unsupported boom or post can be supported and supported, so that the boom and the post can be used as the boom receiver and the post receiver. When the vehicle travels while being supported, even if vibration occurs during travel, a load due to vibration (for example, high-pressure hydraulic pressure) does not act on the swing actuator. Therefore, it is not necessary to increase the mechanical strength of the swing actuator, and the swing actuator can be made lighter.

In the aerial work vehicle having the above structure, the post extends substantially forward and backward on the vehicle body and is rocked so as to overlap with the boom that is collapsed and stowed. The boom receiver may be provided so as to project upward from the vehicle body and the post receiver may be provided so as to project upward on the upper surface of the stored boom.

According to the aerial work vehicle having the above structure, the post is stored so as to overlap the boom in the retracted state, and the post receiver is disposed on the upper surface of the stored boom. Can be

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. This embodiment shows a mode of an overfence work vehicle that performs maintenance work such as painting repair of a bridge. As shown in FIG. 1, the overfence work vehicle 1 is configured based on a truck vehicle having wheels 3 at the front and the rear so that the vehicle can travel and a driving cabin 5 at the front. An aerial work device 20 is mounted on the vehicle body 7 of the truck vehicle. The aerial work apparatus 20 has a swivel base 21 configured to be horizontally swivel driven by a swivel motor (not shown). A boom 23 having a base end portion pivotally connected is attached to the swivel base 21, and the boom 23 is hoisted by a hoisting cylinder 25. The boom 23 is configured to telescopically move by a built-in telescopic cylinder (not shown) by combining the base end boom 23a and the tip end boom 23b in a telescopic manner. Although the boom 23 has a two-stage telescopic boom configuration here, it may have a three-stage telescopic boom configuration or a multi-stage telescopic boom configuration having more than three stages.

At the tip of the tip boom 23b, a bending / extending post 2 is provided.
7 is attached so as to be vertically swingable. A link member 29 is pivotally connected to a lower portion of the bending / extending post 27, and one end of a post leveling cylinder 31 is pivotally connected to an upper end portion thereof. The other end of the post leveling cylinder 31 is pivotally connected to the tip boom 23b. A bending cylinder 33 is pivotally connected between the lower portion of the link member 29 and the front surface of the bending post 27. A holder 35 is attached to the tip of the bending / extending post 27 and can swing up and down. The holder 35 is formed in a hollow cylindrical shape, and its swing is controlled by the post-leveling cylinder 31 and the bending / extending cylinder 33. The post-leveling cylinder 31 and the hoisting cylinder 25 expand and contract in conjunction with each other, and when the boom 23 becomes horizontal, the holder 35
Also expands and contracts to be horizontal. Flexing cylinder 33
Is configured to be capable of expanding and contracting independently of the hoisting cylinder 25, and is capable of swinging the bending / extending post 27 at a large swing angle. In this way, in the hollow holder 35 which is swung by the post leveling cylinder 31 and the bending and extending cylinder 33, the post 37 is inserted and attached so as to be movable in the axial direction.

The post 37 is formed by nesting a base end boom 37a, a first intermediate boom 37b, a second intermediate boom 37c and a tip boom 37d. Here, the base boom 37a is movably held in the holder 35 in the axial direction.
The first intermediate boom 37b, the second intermediate boom 37c, and the tip boom 37d are extendable and retractable by a built-in cylinder (not shown). Although the post 37 has a four-stage telescopic boom configuration here, it may have a multi-stage telescopic boom configuration such as two-stage or three-stage telescopic boom.

A boom moving cylinder 39 for moving the base boom 37a relative to the holder 35 in the axial direction (vertical direction).
Is a side portion of the holder 35, and the holder 35 and the base end boom 3 are
7a and is attached. In this boom moving cylinder 39, the cylinder tube 39a is attached to the holder 35, and the tip end of the rod 39b is the base end boom 37a.
It is pivotally connected to the rear end portion of the post 3 by expanding and contracting the rod 39b with respect to the cylinder tube 39a.
The whole 7 can be moved in the axial direction with respect to the holder 35.

2 and FIG. 3 are further added to the tip of the tip boom 37d, a support arm 41 is provided which is swingably attached to the front and rear and up and down of the vehicle. Is held so as to extend vertically by a platform leveling cylinder 43 arranged above it. If the support arm 41 is not in the vertical state, it is adjusted by the arm turning cylinder 44 arranged on the side portion of the support arm 41. A work table 47 having a swinging mechanism 45 and horizontally rotatable is attached to the tip (lower end) of the support arm 41 held vertically in this way. As a result, the workbench 47 is held in a horizontally extended state and horizontally swivels (pivots). In addition,
A handrail 47a surrounding the workbench 47 is attached to the workbench 47.

The boom 23 constructed in this manner is shown in FIG.
As shown in, the vehicle is stored in a state of being laid down horizontally from the rear side to the front side of the vehicle, and is supported by a boom receiver 9 erected from a substantially central portion of the vehicle body 7. Further, the post 37 swings so as to overlap the boom 23 stored on the vehicle body 3 and extends in the front-back direction on the vehicle body 3 in a folded state so as to be collapsed and stored, and is projected on the upper surface of the boom 23. Supported by the post receiver 11. The workbench 47 is positioned and stored on the side of the stored boom 23 and post 37 on the left side of the vehicle.

Outriggers 13 and 14 are provided on both front and rear right and left sides of the vehicle body 2 so as to be extendable and retractable downward and left and right. The outriggers 13 and 14 have grounding rollers 13a and 14a at their lower ends, respectively. When performing work at heights, further explaining with reference to FIG. 3, the outriggers 13 and 14 are grounded while the front and rear wheels 3 are grounded. Is extended to ground the grounding rollers 13a and 14a to support the vehicle body 7. Further, by driving the wheels 3 with the vehicle body 7 supported in this manner, the entire vehicle can be driven at a low speed to perform a predetermined work at a high place (such as a bridge inspection work). .

As shown in FIG. 4, the hoisting cylinder 25 and the post-leveling cylinder 31 in the aerial work vehicle 1 having the above-described construction are operated by a hoisting operation valve 61 and a combination valve 63 arranged in a hydraulic circuit 60. Controlled. The undulation operation valve is a 6-port 3-position electromagnetic directional control valve, and is configured to cut off the oil supply / discharge control to the cylinder at the neutral position and return the oil discharged from the hydraulic pump P to the tank T. There is. Also,
The combination valve 63 is a 4-port 3-position electromagnetic directional control valve, and is configured to cut off the control of oil supply / discharge to / from the cylinder at the neutral position. Hydraulic circuit 6
When the undulating cylinder 25 extends, the post leveling cylinder 31 interlocks to extend, and when the post leveling cylinder 31 contracts, the undulating cylinder 25 interlocks to contract.

The operation of these valves 61 and 63 is controlled by a controller 65, which will be described with reference to FIG. An operating device 67, a post limit switch (post L / S69), a boom limit switch (boom L / S71), a hoisting operation valve 61, and a combination valve 63 are electrically connected to the controller 65. The operating device 67 is configured to move the boom 23 up and down, bend and extend the post 27, and extend and retract the post 37, as shown in FIG.
This is a device for operating the swing of the support arm 41 and the horizontal turning motion of the work table 47 shown in FIG. 2, and each operation can be operated by tilting operation of an operation lever (not shown).

The boom L / S 71 will be explained by further adding FIG. 1. The boom L / S 71 is attached to the boom receiver 9 and outputs a detection signal (ON signal) when the boom 23 is supported by the boom receiver 9. Is configured. Post L / S6
9 is attached to the post bridge 11, and the post bridge 11
Detection signal (ON signal) when the post 37 is supported by
Is configured to output. Boom L / S7
1 and the post L / S 69 are configured to output a detection signal (OFF signal) when the boom 23 and the post 37 are not supported. The controller 65 controls the operation of the up-and-down operation valve 61 and the combination valve 63 in accordance with the detection signals from the boom L / S 71 and the post L / S 69, and the bending / extending cylinder 33 and the post 37 in accordance with the operation content of the operating device 67. Of the telescopic cylinder (not shown), the arm swiveling cylinder 44, and the swing mechanism 45 of the workbench 47 shown in FIG. 2 (hereinafter collectively referred to as “boom actuator 73”). It has a function of controlling the operation of 74.

In the overfence work vehicle 1 configured as described above, the boom 23 extends substantially forward and backward along the vehicle body 7 and is horizontally stored, laid down and supported by the boom receiver 9, and the post 37 is supported by the boom 23. About 180 downwards
The workbench 47 is swung so as to be bent once, extends parallel to the upper side of the boom 23 and is stored in parallel, and is supported by the post receiver 11. The workbench 47 is stored on the left side of the boom.

By the way, assuming a vehicle without the boom receiver 9 and the post receiver 11 described above, the boom 23 and the post 37 are stored in a state of extending horizontally in the front-rear direction of the vehicle body 7 as described above. In the state after storage, the up-and-down operation valve 61 and the combination valve 6 shown in FIG.
Since 3 is in the neutral state, the post leveling cylinder 3
The oil passage 75 connected to the 1 and the undulating cylinder 25 is closed by valves 61 and 63. As a result, when the vehicle travels with the boom 23 and the post 37 stored, the boom 23 swings up and down due to the vibration generated during travel, and the undulating cylinder expands and contracts, and accordingly, the oil within the oil passage 75. The post-leveling cylinder 31 also tries to expand and contract due to the oil. However, since the oil passage 75 connected to the post leveling cylinder 31 is in the closed state, the post leveling cylinder 31 cannot expand and contract. Also,
The same applies when the post 37 swings. Therefore, high pressure hydraulic pressure acts on the inside of the post leveling cylinder 31. Therefore, the post leveling cylinder 31 is required to have high mechanical strength, and as a result, the weight of the post leveling cylinder 31 becomes heavy.

However, in the overfence work vehicle 1 of the present invention, when the boom 23 and the post 37 are stored, the boom 23 is supported by the boom receiver 9 and the post 37 is supported by the post receiver 11. Since it is configured, the boom 23 and the post 37 will not be separated while being supported by the boom receiver 9 and the post receiver 11 even if vibration is generated during traveling. Therefore, since the undulating cylinder 9 and the post leveling cylinder 31 do not expand and contract, high pressure hydraulic pressure does not act on the post leveling cylinder 31.
As a result, it is not necessary to increase the mechanical strength of the post leveling cylinder 31, and the post leveling cylinder 3
1 can be lightened.

When the vehicle without the boom receiver 9 and the post receiver 11 is assumed, the boom 23 and the post 3 are provided.
As described above, 7 is stored in a state where it horizontally extends in the front-rear direction of the vehicle body 7, but when the operation of the post leveling cylinder 31 goes wrong, the post 37 is stored in a tilted state and the work table 47 is also tilted. become. Therefore, in order to correct this inclination, it is necessary to operate the operation device 67 to make the post 37 parallel. However, in the vehicle according to the present invention, the boom receiver 9 and the post receiver 11 are installed,
The boom 23 and the post 3 are attached to the boom receiver 9 and the post receiver 11.
If 7 is supported, the post 37 will be in a substantially parallel state. For this reason, it is possible to prevent the deviation of the leveling operation from being accelerated, and it is possible to eliminate the paralleling work for parallelizing the posts 37.

Furthermore, in the vehicle of the present invention, when the boom 23 is tilted down by the operating device 67 shown in FIG. Solenoid 6
1a is excited to supply the oil discharged from the hydraulic pump P to the rod chamber 31a of the post-leveling cylinder 31 and to connect the oil passage 75 connected to the bottom chamber 25b of the undulating cylinder 25 to the tank T. As a result, the post-leveling cylinder 31 contracts and the hoisting cylinder 25 also contracts, and the boom 23 shown in FIG. 1 falls and the post 37 moves downward in a parallel state.

Here, if the contraction movement of the post leveling cylinder 31 operates normally, when the boom 23 is supported by the boom receiver 9, the post 37 is also supported by the post receiver 11, but the contraction movement of the post leveling cylinder 31 is performed. Goes crazy,
One of the boom 23 and the post 37 may be unsupported by the boom receiver 9 or the post receiver 11, causing the above-mentioned problem.

However, in the vehicle of the present invention, further explanation will be given with reference to FIG. 6. When the boom 23 is in the retracted state and the post 37 is in the non-retracted state, the post 37 is placed in the retracted state and the post receiver 11 is placed. The operation of the combination valve 63 is controlled so as to support it. That is, boom 2
When the post 37 is in the non-stored state while the post 3 is in the retracted state, the boom L / S 71 outputs an ON signal and the post L / S 69 outputs an OFF signal. Then, these signals are sent to the controller 65 shown in FIG. 5, and the controller 65 excites the solenoid 63a on the a side of the combination valve 63 to cause the oil discharged from the hydraulic pump P to pass through the combination valve 63 and the post-leveling cylinder 31.
The oil passage 76, which is connected to the bottom chamber 31b of the post-leveling cylinder 31 while being supplied to the rod chamber 31a, is communicated with the tank T. Since the boom 23 is supported by the boom receiver 9, an operator (not shown) operates the operation device 67 so that the up-and-down operation valve 61 is at the neutral position.

As a result, the post-leveling cylinder 31
Is contracted, the flexion / extension post 27 falls down, and the post 37 is supported by the post bridge 11. When the controller 65 receives the ON signal of the post L / S 69, the controller 65 deenergizes the solenoid 63a on the side a of the combination valve 63 to cut off the oil supply to the post leveling cylinder 31.

On the other hand, with the post 37 retracted, the boom 23
If the boom is not stored, the operation of the combination valve 63 is controlled so that the boom 23 is stored and supported by the boom receiver 9. That is, when the post 37 is retracted and the boom 23 is not retracted, the boom L /
S71 outputs an OFF signal, post L / S69 is ON
Output a signal. Then, these signals are sent to the controller 65 shown in FIG. 5, and the controller 65 excites the solenoid 63b on the b side of the combination valve 63 to cause the oil discharged from the hydraulic pump P to flow through the combination valve 63 to the undulating cylinder 25. Supply to the rod chamber 25a. At this time, the bottom chamber 25 of the undulating cylinder 25
The oil passage 75 connected to b is communicated with the tank T via the undulating operation valve 61. This is because the boom 23 is not supported by the boom receiver 9 and the operating device 67 is in an operating state in which the boom 23 is laid down by an operator (not shown).
This is because the a-side solenoid 61a of 1 is in the excited state.

As a result, the undulating cylinder 25 contracts,
The boom 23 falls and is supported by the boom receiver 9. Then, when the boom L / S 71 outputs an ON signal and the controller 65 receives this signal, the controller 65 sets the solenoid 63b on the b side of the combination valve 63 to a non-excited state to bring it into a neutral state, and oil to the undulating cylinder 25 is released. Cut off supply.

In this way, when the boom 23 and the post 37 are stored, even if either the boom 23 or the post 37 is not supported by the boom receiver 9 or the post receiver 11, the boom 23 or the post 37 is stored.
The operation is controlled so as to automatically fall down, so that the boom 23 and the post 37 can be reliably supported. As a result, even when the operation of the post leveling cylinder 31 is wrong, the adjustment work of the post leveling cylinder 31 can be automatically performed.

[0035]

According to the aerial work vehicle of the present invention, the operation control means controls the operation of the boom or the post so that the boom or the post which is not supported is supported by the boom receiver or the post receiver. In the above, the boom and the post are always supported by the boom support and the post support, and this is automatically adjusted even if the leveling operation of the post goes wrong. As a result, the leveling adjustment work becomes unnecessary, and it is possible to prevent the deviation of the leveling operation from being promoted. Further, when the vehicle travels with the boom and the post supported by the boom receiver and the post receiver, a load (for example, high-pressure hydraulic pressure) does not act on the rocking actuator due to the vibration generated at the time of running. There is no need to increase mechanical strength,
The swing actuator can be made lighter.

[Brief description of drawings]

FIG. 1 shows a front view of an overfence work vehicle in an embodiment of the present invention.

FIG. 2 shows a plan view of an overfence work vehicle in an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram when work is performed by the overfence work vehicle in the embodiment of the present invention.

FIG. 4 shows a hydraulic circuit of the overfence work vehicle in the embodiment of the present invention.

FIG. 5 shows a block diagram of an overfence work vehicle in an embodiment of the present invention.

FIG. 6 is a diagram for explaining the operation of the overfence work vehicle in the embodiment of the present invention.

[Explanation of symbols]

1 Overfence work vehicle (work vehicle at high place) 7 Body 9 Boom receiver 11 Post receiver 21 Swivel platform 23 Boom 25 Elevating cylinder (elevating actuator) 31 Post leveling cylinder (oscillating actuator) 37 Post 47 Workbench 65 Controller (operation control) Means) 69 post L / S (post support detection means) 71 boom L / S (boom support detection means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Furusho             1015 1152 Yamashita, Ryoke, Ageo City, Saitama Prefecture               Aichi Corporation Ageo Kogyo             Inside the hall F term (reference) 3F333 AA08 AB04 AC20 CA02 DA10                       DB10 FA08 FD20

Claims (3)

[Claims] 1. A vehicle capable of traveling, a swivel mounted on the vehicle body of the vehicle so as to be able to swivel horizontally, a boom attached to the swivel so as to be able to move up and down, and an upper and lower end of the boom. And a work platform attached to the tip of the post. The boom and the post extend substantially forward and backward on the vehicle body and are stored while lying down. An aerial work vehicle, which detects a boom receiver that supports the boom in a state where the boom and the post are stored, a post receiver that supports the post, and whether or not the boom is supported by the boom receiver. Boom support detecting means, post support detecting means for detecting whether or not the post is supported by the post receiver, and the boom support detecting hand during storage operation of the boom and the post. And a detection signal of said post supporting the detection means, when either of the boom and the post is not supported by the boom receiving and the post receiving,
An aerial work vehicle, comprising: an operation control unit that controls an operation of the boom or the post so that the boom or the post that is not supported is supported by the boom receiver or the post receiver. 2. The boom has a hoisting actuator for hoisting, the post has a rocking actuator for rocking, and the operation control means is configured so that the boom is detected by the boom support detecting means. When it is detected that the post is supported by the boom bridge, and when the post is not supported by the post bridge by the post support detecting means, the post falls and is supported by the post bridge. The operation of the swing actuator is controlled, the boom support detecting means detects that the boom is not supported by the boom receiver, and the post support detecting means detects that the post is supported by the post receiver. And controlling the operation of the hoisting actuator so that the boom falls and is supported by the boom receiver. The aerial work vehicle described in 1. 3. The post swings substantially forward and backward on the vehicle body to fall over the boom stored and stowed so as to overlap the boom, and in a folded state, the post extends substantially forward and backward and falls down on the vehicle body. The boom receiver is provided so as to project upward from the vehicle body,
The aerial work vehicle according to claim 1, wherein the post receiver is provided on the upper surface of the stored boom so as to project upward.