JP2022055517A - Vehicle for high lift work - Google Patents

Abstract

To provide a vehicle for high lift work with a good traveling stability and with an excellent getting on/off property to a workbench from a traveling body.SOLUTION: A vehicle for high lift work 1 has a workbench supporting mechanism 60 to horizontally pivotably suspend and support a workbench 50 provided at the tip of a boom 30. The workbench supporting mechanism 60 supports the workbench 50 so that the workbench 50 can be located at a first workbench position where the workbench is located below the boom 30 in plan view and at a second workbench position where the workbench is located deviated from below the boom 30 to leftward in a state that the boom 30 is retracted on the traveling body 10. The workbench 50 is restricted from being located at the second workbench position when the traveling body 10 is not supported by a jack 13.SELECTED DRAWING: Figure 2

Description

The present invention relates to an aerial work platform that supports a workbench horizontally at the tip of a boom.

The aerial work platform is provided, for example, with a traveling body capable of traveling with front and rear wheels, a boom freely arranged on the traveling body such as undulation, expansion and contraction, turning, and the tip of the boom. Equipped with a workbench for boarding workers, the worker on the workbench can move the workbench to any high position by operating the operation device provided on the workbench to operate the boom. It is configured in. In such aerial work platforms, the position of the center of gravity is raised by moving the boom up and down to position the workbench at a high place, so in order to maintain a stable working posture during work, the workbench is grounded. It is equipped with multiple jacks that lift and support the vehicle.

In aerial work platforms, the workbench is hung down and supported at the tip of the boom so that it can turn horizontally, and when the boom is laid down and stored, the workbench is placed on the vehicle in a position lower than the boom in the retracted position. Those configured to be located (referred to as "workbench hanging support type aerial work platform" for convenience) are known (see, for example, Patent Document 1 below). In such a workbench hanging support type aerial work platform, two main positions are selected as the positions of the workbench in the boom retracted state. One is the position where the workbench comes under the boom in the state of being laid down and stored (also referred to as "first workbench position"). The other is a position (also referred to as "second workbench position") in which the workbench is displaced to the left and right sides of the boom in a state of being laid down and stored in a plan view.

Japanese Patent No. 4014510

When the workbench is located at the position of the first workbench, the workbench is located below the boom, so that the center of gravity of the frame consisting of the boom and the workbench is closer to the front-rear axis side of the traveling body. Therefore, the weight distribution of the entire vehicle can be brought close to an even state on the left and right, which has the advantage of stabilizing the vehicle during traveling. However, since the workbench is located below the boom, if a worker tries to get on and off the workbench in this state, the boom becomes an obstacle and getting on and off is poor. On the other hand, when the workbench is in the second workbench position, the workbench is located so as to be offset from the lower side of the boom to the left and right sides in a plan view, so that the upper part of the workbench is not covered by the boom and the boom does not become an obstacle. Therefore, it is easy to get on and off the workbench from the running body. However, the position of the center of gravity of the frame consisting of the boom and the workbench is separated from the front-rear axis of the traveling body, and the weight distribution of the entire vehicle becomes uneven on the left and right. There is a risk that the stability of the

The present invention has been made in view of such a problem, and an object of the present invention is to provide an aerial work platform having good stability during traveling and excellent getting on and off from a traveling body to a workbench. ..

In order to solve the above problems, the aerial work platform according to the present invention includes a traveling body, a plurality of jacks provided on the front, rear, left and right sides of the traveling body and capable of supporting the traveling body, and the traveling body. An elevating mechanism provided (for example, the swivel table 20 and the bending boom 30 in the embodiment), a workbench supported by the elevating mechanism so as to be able to elevate, and a jack operation control device (for example) for controlling the operation of the plurality of jacks. , The aerial work platform having the jack operation control unit 102) of the controller 100 in the embodiment and the elevating operation control device (for example, the controller 100 in the embodiment) for controlling the operation of the elevating mechanism. The mechanism includes a boom that can be undulated and stored in a state of being laid down on the traveling body, and a workbench support mechanism that is provided at the tip of the boom and supports the workbench so that it can be horizontally swiveled and moved. The workbench support mechanism includes the workbench, the first workbench position where the workbench is located below the boom in a plan view, and the workbench position in a state where the boom is stored on the traveling body. It is configured to support it so that it can be positioned at the position of the second workbench, which is located off the bottom of the boom to the left and right.

In the aerial work platform according to the present invention, preferably, when the boom is stored on the traveling body and the plurality of jacks support the traveling body, the workbench support mechanism is used to support the traveling body. When the workbench is allowed to be positioned at the second workbench position and the plurality of jacks do not support the traveling body, the workbench support mechanism causes the workbench to be positioned at the second workbench position. It is configured to regulate being located in.

Further, in the aerial work platform according to the present invention, preferably, when the boom is stored on the traveling body and the plurality of jacks support the traveling body, the workbench Is in the first workbench position, the jack operation control device allows the plurality of jacks to release the support of the traveling body, and the workbench is in the second workbench position. , The jack operation control device regulates that the plurality of jacks release the support of the traveling body.

Further, in the aerial work vehicle according to the present invention, preferably, a boarding determination device (for example, the controller 100 in the embodiment) for determining whether or not an operator is on the workbench is provided, and the boom is said. When it is determined by the boarding determination device that an operator is not on the workbench in the state of being stored on the traveling body, the workbench is allowed to move by the workbench support mechanism, and the boarding is permitted. When it is determined by the discrimination device that an operator is on the workbench, the workbench support mechanism is configured to restrict the movement of the workbench.

According to the aerial work platform according to the present invention, the workbench can be positioned at the first workbench position and the second workbench position by the workbench support mechanism in a state where the boom is stored on the traveling body. can. Therefore, when traveling, the workbench is positioned at the first workbench position to improve the stability of the vehicle during traveling, and when getting on and off the workbench, the workbench is positioned at the second workbench position. This makes it possible to improve the ease of getting on and off the workbench.

In the aerial work platform according to the present invention, when the jack supports the traveling body in the state where the boom is retracted, the workbench is allowed to be positioned at the second workbench position, and the jack is the traveling body. If the workbench is not supported, the workbench is restricted from being positioned at the second workbench position, so that the traveling body is supported by the jack when the workbench is located at the second workbench position. can do. Therefore, it is possible to prevent the vehicle from running while the workbench is located at the position of the second workbench.

In the aerial work platform according to the present invention, when the jack supports the traveling body in the state where the boom is retracted, the jack supports the traveling body when the workbench is in the first workbench position. If the workbench is in the second workbench position, the workbench is not supported by the jack by restricting the jack from releasing the support of the vehicle. Can be in a state of being located at the position of the first workbench. Therefore, it is possible to prevent the vehicle from running while the workbench is located at the position of the second workbench.

In the high-altitude workbench according to the present invention, when it is determined that the worker is not on the workbench with the boom retracted, the workbench is allowed to move by the workbench support mechanism, and the workbench is allowed to move. If it is determined that a worker is on board, the worker on the workbench is sandwiched between the boom and the workbench by restricting the movement of the workbench by the workbench support mechanism. It is possible to prevent it from hitting the boom or hitting the boom.

It is a top view when the workbench is in the 1st workbench position in the state which the boom of the refraction boom type aerial work platform which concerns on one Embodiment of this invention is stored. It is a side view when the workbench is in the 1st workbench position in the state which the boom of the aerial work platform is retracted. It is a side view which shows the appearance of the said aerial work platform in a state where a boom is extended and a workbench is moved to a high place. It is a top view when the workbench is in the 2nd workbench position in the state which the boom of the aerial work platform is retracted. It is a side view when the workbench is in the 2nd workbench position in the state which the boom of the aerial work platform is retracted. It is a block diagram which shows the workbench swing operation control system of the said aerial work platform.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 to 3 show the aerial work platform 1 of the refraction boom type (bending / stretching boom type) according to the embodiment of the present invention. First, the aerial work platform mainly with reference to FIGS. 1 to 3 is shown. The overall configuration of 1 will be outlined. As shown in these figures, the aerial work platform 1 includes a truck-type traveling body 10 provided with tire wheels 11 and capable of traveling driving operation from the driving cabin 12, and a swivel table 20 provided on the traveling body 10. A bending boom (hereinafter, simply referred to as a boom) 30 whose base end is pivotally supported via a foot pin 22 on the upper portion of a support column 21 extending upward from the swivel table 20, and the tip of the boom 30. It is configured to have a workbench (also referred to as a "basket") 50 for boarding a worker attached to the portion.

The swivel base 20 is attached to the rear portion of the traveling body 10 so as to be rotatable 360 degrees around the vertical axis. A swivel motor 23 made of a hydraulic motor is provided inside the traveling body 10, and by rotating the swivel motor 23, the swivel base 20 is swiveled around the vertical axis (that is, horizontally) via a gear (not shown). It can be turned). The boom 30 is composed of a lower boom 31 and an upper boom 32 arranged on the right side of the lower boom 31. The lower boom 31 is composed of a first boom member 31a, a second boom member 31b and a third boom member 31c configured in a nested manner, and the upper boom 32 is a fourth boom member 32a and a fifth boom member configured in a nested manner. It consists of 32b (see FIG. 3). A boom member located on the uppermost side of the lower boom 31, that is, a pivot shaft 33 extending laterally is attached to the tip of the third boom member 31c, and the pivot shaft 33 causes the upper boom 32 to be attached. The boom member located on the lowermost side, that is, the base end portion of the fourth boom member 32a is pivotally supported.

Inside the lower boom 31, a first telescopic cylinder 34 made of a hydraulic cylinder extends in the axial direction of the lower boom 31, and the boom members 31a and 31b constituting the lower boom 31 by the expansion / contraction operation of the first telescopic cylinder 34. , 31c can be relatively moved to expand and contract the entire lower boom 31 in the axial direction. Further, a second telescopic cylinder 35 made of a hydraulic cylinder is provided inside the upper boom 32 so as to extend in the axial direction of the upper boom 32. By expanding and contracting the second telescopic cylinder 35, each of the upper boom 32 is configured. The boom members 32a and 32b can be relatively moved to expand and contract the entire upper boom 32 in the axial direction.

The fourth boom member 32a located on the lower side of the upper boom 32 is connected to the pivot shaft 33 via the first link 36a and the second link 36b provided at the base end portion thereof. Here, the first link 36a is fixed on the pivot shaft 33, the second link 36b is fixed to the fourth boom member 32a, and then the swing shaft 36c attached to the first link 36a. It is supported so that it can swing in the vertical plane through. One end side of the first arm-shaped member 37a is pivotally supported on both the left and right sides of the first link 36a, and one end side of the second arm-shaped member 37b is pivotally supported on the left and right sides of the second link 36b, respectively. The other ends of each of the first arm-shaped member 37a and the second arm-shaped member 37b are pivotally supported by a shaft member 38 provided in parallel with the pivot shaft 33, and one end side of the shaft member 38 is the first. 4 The other end side of a refraction cylinder 40 made of a hydraulic cylinder pivotally supported by a cylinder holding bracket 39 fixed to the middle portion of the boom member 32a is attached.

Therefore, by expanding and contracting the refraction cylinder 40, the upper boom 32 is moved in the vertical plane with respect to the lower boom 31 via the first arm-shaped member 37a, the second arm-shaped member 37b, the first link 36a, and the second link 36b. It is possible to refract. Specifically, when the refraction cylinder 40 is extended, the arm-shaped members 37a and 37b move in the opening direction with the shaft member 38 as the fulcrum, so that the entire upper boom 32 swings in the direction away from the lower boom 31. When the refraction cylinder 40 contracts, the both arm-shaped members 37a and 37b move in the closing direction with the shaft member 38 as the fulcrum, so that the entire upper boom 32 approaches the lower boom 31. It swings to "bend". In the state where the refraction cylinder 40 is fully contracted, the upper boom 32 is in a posture parallel to the lower boom 31.

Further, an undulating cylinder 24 made of a hydraulic cylinder is straddled between the first boom member 31a located on the lowermost side of the lower boom 31 and the support column 21 of the swivel base 20, and the undulating cylinder 24 is expanded and contracted. Thereby, it is possible to move the entire lower boom 31 up and down in the vertical plane.

A workbench support mechanism 60 is provided at the tip of the fifth boom member 32b located on the upper side of the upper boom 32. The workbench support mechanism 60 includes a bracket member 61 fixed to the tip of the fifth boom member 32b, a support member 62 attached to the bracket member 61 so as to be curved downward and diagonally forward, and a support member 62. An offset member 63 attached to the lower end of the offset member 63 so as to extend to the left (front side of the paper in FIG. 3), and an L-shaped member attached to the tip of the offset member 63 so as to extend downward and then horizontally. It is provided with a post member 64. The support member 62 is supported by the bracket member 61 so as to be able to swing in a vertical plane. Further, a leveling mechanism (not shown) adjusts the posture of the support member 62 with respect to the bracket member 61 so that the portion extending in the vertical direction of the post member 62 is always held in the vertical posture. The post member 64 is rotatably attached to the offset member 63 around the vertical axis, and the boundary portion between the offset member 63 and the post member 64 includes a hydraulic motor for rotating the post member 64. A swing motor 65 (see FIG. 6 below) is provided. The offset member 63 is a member for shifting the rotation center of the post member 64 (the swinging center of the workbench 50) from the upper boom 32 side to the lower boom 31 side in the retracted state of the boom 30, which will be described later.

The workbench 50 is formed in a box shape by arranging a fence 52 made of a pipe material around a rectangular floor plate 51. On one side surface of the fence 52 (the surface facing the left side of the traveling body 10 in FIG. 1),
An entrance / exit door (not shown) is provided, and by opening the entrance / exit door, an operator can get on and off the workbench 50. The workbench 50 is attached to the tip of a horizontally extending portion of the post member 62, and is supported by the tip of the upper boom 32 via the workbench support mechanism 60. As described above, since the portion of the post member 62 extending in the vertical direction is always held in the vertical posture, the floor surface of the workbench 50 is always kept in the horizontal posture regardless of the posture of the boom 30. Further, the workbench 50 swings (horizontally turns) by rotating the post member 64 around the vertical axis by the swing motor.

Outrigger jacks (also simply referred to as "jacks") 13 for stably supporting the traveling body 10 in the working state in which the boom 30 is operated to move the workbench 50 upward are provided at the front, rear, left, and right positions of the traveling body 10. It is provided. Each outer jack 13 is attached to an outer jack (cylinder tube) 13a extending in the vertical direction, an inner jack (piston rod) 13b provided in the outer jack 13a and expandable in the vertical direction, and the lower end of the inner jack 13b. It is configured to have a jack pad 13c attached so as to be swingable. In each outrigger jack 13, the inner jack 13b is moved downward (extended), and the jack pad 13c is brought into contact with the ground to be stretched so that the traveling body 10 can be supported in a lifted state (see FIG. 2). Further, each outrigger jack 13 can be extended to the side of the traveling body 10, whereby a higher stability of the traveling body 10 can be obtained. The outer trigger jack 13 has an outer box extending in the vertical direction and an inner box provided in the outer box so as to be expandable and contractable in the vertical direction. The box may be configured to extend downward. Further, it has an outrigger box provided on the traveling body 10 and extending in the left-right direction and an outrigger beam supported by the outrigger box so as to be expandable and contractible to the side, and an outrigger jack 13 (outer box) is provided at the tip of the outrigger beam. The outrigger beam may be configured to extend in the left-right direction by a cylinder built in the outrigger beam.

As shown in FIGS. 1 and 2, an operating device 55 is provided on the workbench 50, and the operating device 55 rotates the swivel motor 23, expands and contracts the undulating cylinder 24, and expands and contracts the first telescopic cylinder 34. The levers (not shown) for performing the expansion / contraction operation of the second expansion / contraction cylinder 35, the expansion / contraction operation of the refraction cylinder 40, and the rotation operation of the swing motor 54 are provided. The worker on the workbench 50 operates these levers to swivel the swivel table 20, undulate and expand / contract the lower boom 31, bend and expand / contract the upper boom 32, or swing the workbench 50. By operating (horizontal turning), it is possible to move the workbench 50 on which it is boarded to a desired position and posture. Specifically, in response to the operation by the operating device 55, the controller 100 controls the operation of each hydraulic actuator via the control valve CV (see FIG. 6 described later). In addition, another operation device (lower operation device) for the operator on the ground to operate each hydraulic actuator may be provided in the traveling body 10.

Further, FIGS. 1 and 2 show a retracted state (retracted posture) of the boom 30 in the aerial work platform 1. As shown in these figures, in the retracted state of the boom 30, the lower boom 31 extends in the front-rear direction of the traveling body 10 in a substantially horizontal posture (the tip side is forward), and the upper boom 32 is in a posture substantially parallel to the lower boom 31. It is in a state of extending in the direction opposite to the extending direction of 31 (that is, backward). The procedure for retracting the boom 30 from the overhanging state is as follows: first, the lower boom 31 and the upper boom 32 are fully contracted, then the lower boom 31 is raised or lowered until a predetermined undulation angle is reached, and the refraction cylinder 40 is fully contracted. The upper boom 32 is in a state parallel to the lower boom 31. Finally, the lower boom 31 is laid down until it is in a substantially horizontal position and placed on the boom support post 26. As a result, the lower boom 31 and the upper boom 32 are stored in the above posture.

In the aerial work platform 1, in the state where the boom 30 is retracted as described above, the workbench 50 is swung by the workbench support mechanism 60 to change the position of the workbench 50 on the traveling body 10. Can be done. This point will be described with reference to FIGS. 4 and 5. 1 and 2 show a state in which the workbench 50 is located below the boom 30 in a plan view in the retracted state of the boom 30 (the position of the workbench 50 in this state is referred to as “the first workbench”. Called "position"). On the other hand, FIGS. 4 and 5 show a state in which the workbench 50 is located away from the lower side of the boom 30 to the left side in a plan view in the retracted state of the boom 30 (the workbench in this state). The position of 50 is referred to as "second workbench position").

When the workbench 50 is in the first workbench position, the workbench 50 is located below the boom 30, so that the center of gravity of the frame consisting of the boom 30 and the workbench 50 is on the front-rear axis side of the traveling body 10. The weight distribution of the entire vehicle can be made closer to the left and right evenly, so that the vehicle is stable during running. Therefore, the position of the first workbench is suitable as the position of the workbench 50 during traveling. On the other hand, in the state where the workbench 50 is in the second workbench position, the workbench 50 is located away from the lower side of the boom 30 to the left side in a plan view, so that the frame consisting of the boom 30 and the workbench 50 is located. The position of the center of gravity of the vehicle is separated from the front-rear axis of the traveling body 10, and the weight distribution of the entire vehicle becomes uneven on the left and right, so that the stability of the vehicle during traveling is lowered. In particular, there is a risk that the turning angle will be small. Therefore, the position of the second workbench is not suitable as the position of the workbench 50 during traveling. Further, as shown in FIG. 4, since a part of the workbench 50 protrudes to the left side from the traveling body 10 in a plan view, traveling in this state is prohibited. However, in the state where the workbench 50 is in the second workbench position, the upper part of the workbench 50 is not covered by the boom 30, and the boom 30 does not become an obstacle, so that it is suitable for the worker to board the workbench 50. .. That is, as shown by the arrow K in FIG. 4, the worker rises on the traveling body 10 by using the step 27 provided on the rear left side portion of the traveling body 10, and then the workbench 50 at the position of the second workbench By opening the door for getting on and off the vehicle, the worker can smoothly board the workbench 50. On the other hand, in the state where the workbench 50 is in the first workbench position, the upper part of the workbench 50 is covered by the boom 30, and the boom 30 becomes an obstacle. Not suitable.

In the state where the boom 30 is retracted, in order to position the workbench 50 at the first workbench position, as shown in FIG. 1, the horizontally extending portion of the post member 64 in the workbench support mechanism 60 is an offset member. The workbench 50 may be horizontally swiveled around the swivel center X in a plan view by a swing motor 65 so as to be perpendicular to 63. Similarly, in order to position the workbench 50 at the second workbench position, as shown in FIG. 4, a swing motor is provided so that the horizontally extending portion of the post member 64 is aligned with the offset member 63. The workbench 50 may be horizontally swiveled around the swivel center X by 65.

Next, the swing operation control system of the workbench will be described with reference to FIG. This workbench swing operation control system controls the swing operation of the workbench 50 by the workbench support mechanism 60 in a state where the boom 30 is retracted, and as shown in FIG. 6, the controller 100 and the controller 100 It includes a jack state detector 111, a workbench position detector 112, a workbench boarding detector 113, a swing operation switch 114, and a jack operation device 115.

The jack state detector 111 detects the state of each jack 13, and is composed of, for example, a sensor that detects that the jack 13 has touched the ground, a sensor that detects the amount of extension of the jack 13, and the like. The workbench position detector 112 detects the position of the workbench 50 in a state where the boom 30 is retracted, and is composed of, for example, a sensor that detects the turning angle of the workbench 50 by the swing motor 65. The workbench boarding detector 113 detects whether or not a worker is on the workbench 50. For example, a sensor that detects a load acting on the workbench 50 or a passenger on the workbench 50. It is composed of sensors that detect the presence by images, sound waves, temperature, etc. The swing operation switch 114 is a switch that is operated when the position of the workbench 50 on the traveling body 10 is changed when the boom 30 is in the retracted state, and is a predetermined position of the traveling body 10, for example, a lower operation. It is also placed on the device. The jack operating device 115 includes an operating lever or the like that is operated to operate each jack 13, and is arranged at a predetermined position of the traveling body 10.

As shown in FIG. 6, the controller 100 includes a swing operation control unit 101 and a jack operation control unit 102. These schematically represent the functions of the controller 100. When the swing operation switch 114 is operated, the swing operation control unit 101 operates the swing motor 65 via the control valve CV to swing the workbench 50 and perform the work. It has a function of changing the position of the table 50 on the traveling body 10. Specifically, for example, when the swing operation switch 114 is operated while the workbench 50 is in the first workbench position, the workbench instruction mechanism 60 moves the workbench 50 to the second workbench position. If the swing operation switch 114 is operated while the workbench 50 is in the second workbench position, the workbench instruction mechanism 60 moves the workbench 50 to the first workbench position. However, even if the swing operation switch 114 is operated, the swing motor 65 may not be operated and the workbench 50 may not be swung.

Specifically, in a state where the traveling body 10 is not supported by each jack 13, the swing motor 65 is operated even if the swing operation switch 114 is operated to move the workbench 50 to the second workbench position. Do not move the workbench 50 to the second workbench position. For example, based on the detection results of the jack state detector 111 and the workbench position detector 112, it is determined that the traveling body 10 is not supported by each jack 13 and the workbench 50 is in the first workbench position. When 100 determines, even if the swing operation switch 114 is operated, the swing operation control unit 101 does not operate the swing motor 65. If the workbench 50 is allowed to be positioned at the second workbench position while the traveling body 10 is not supported by each jack 13, the workbench 50 travels with the workbench 50 located at the second workbench position. There is a risk that the body 10 will run. According to the present embodiment, it is possible to prevent such a situation from occurring.

Further, in a state where the workbench 50 has a passenger, even if the swing operation switch 114 is operated to move the workbench 50 on the traveling body 10, the swing motor 65 is not operated and the workbench 50 is not moved. .. Specifically, there are passengers on the workbench 50 based on the detection result of the workbench boarding detector 113 (for example, the detection result that the load acting on the workbench 50 exceeds a predetermined value (for example, 30 kilograms)). When the controller 100 determines that, even if the swing operation switch 114 is operated, the swing motor 65 is not operated, and the workbench 50 is not moved by the workbench support mechanism 60. When there is a occupant on the workbench 50 in the state where the boom 30 is retracted, if the workbench 50 is allowed to be moved on the traveling body 10 based on the operation of the swing operation switch 114, the passenger gets on board. There is a risk that the worker or the like may come into contact with the boom 30 or be pinched between the boom 30 and the workbench 50. According to this embodiment, it is possible to prevent such a situation from occurring.

The jack operation control unit 102 has a function of operating the jack 13 via the control valve CV in response to the operation of the jack operating device 115 when the jack operating device 115 is operated. However, the boom 30 may not be operated even if the jack operating device 115 is operated. Specifically, in a state where the traveling body 10 is supported by each jack 13 and the workbench 50 is in the position of the second workbench, even if the jack operating device 115 is operated to store each jack 13, the jacks are jacked. Do not activate 13. That is, based on the detection results of the jack state detector 111 and the workbench position detector 112, it is determined that the traveling body 10 is supported by each jack 13 and the workbench 50 is in the second workbench position. If this is the case, even if the jack operating device 115 is operated, it is restricted that the jack 13 is not operated and the jack 13 is stored. If the jack 13 is allowed to be stored while the workbench 50 is in the second workbench position, the traveling body is in a state where the workbench 50 is located in the second workbench position after the jack 13 is retracted. There is a risk that 10 will be driven. According to the present embodiment, in order to store the jack 13, the workbench 50 needs to be located at the position of the first workbench, so that such a situation can be prevented.

According to the aerial work platform 1 having the workbench control system configured as described above, the aerial work platform 1 is stopped at the work site, the traveling body 10 is supported by the jack 13, and then the swing operation switch 114. By the operator operating, the workbench 50 in the first workbench position can be moved to the second workbench position in the state where the boom 30 is retracted. Therefore, the worker can easily board the workbench 50 that has moved to the position of the second workbench and start the work. After the work is completed, the worker on the workbench 50 operates the operation device 55 to position the workbench 50 at the second workbench position while storing the boom 30. Then, the worker can easily get off the workbench 50 located at the position of the second workbench with the boom 30 retracted. Further, after getting off the workbench 50, the operator can operate the swing operation switch 114 to move the workbench 50 at the second workbench position to the first workbench position. Further, by storing the jack 13, the aerial work platform 1 can travel. Therefore, when the aerial work platform 1 travels, the boom 30 can be retracted and the workbench 50 can be positioned at the position of the first workbench, so that the aerial work platform 1 can be in a stable state with a good weight balance. 1 can be run.

The present invention is not limited to the above embodiment, and can be appropriately improved as long as it does not deviate from the gist of the present invention. For example, in the above-described embodiment, the lower boom 31 is composed of three boom members (first boom member 31a, second boom member 31b, and third boom member 31c), but this is an example, and there are three. It is not limited to be composed of any number of boom members (may be composed of one boom member). Similarly, the upper boom 32 is composed of two boom members (fourth boom member 32a and fifth boom member 32b) in the above-described embodiment, but this is an example, and the number of booms is not limited to two. It may be composed of members (may be composed of one boom member).

Further, in the above-described embodiment, the upper boom 32 is configured to be arranged on the right side of the lower boom 31 in the retracted state of the boom 30, but the upper boom is configured to be arranged on the left side of the lower boom 31. You may. Alternatively, the upper boom 32 may be configured to be arranged below the lower boom 31 in the retracted state of the boom 30. Further, in the above-described embodiment, the second workbench position in the retracted state of the boom 30 is arranged on the left side of the boom 30 in the plan view, but the second workbench position is on the right side of the boom in the plan view. It may be configured to be arranged. Further, when the jack operating device 115 is operated to extend each jack 13, the workbench 50 is positioned from the first workbench position to the second workbench position in conjunction with the extension operation of each jack 13. The swing motor 65 may be operated. Further, when the jacks 13 are retracted and operated, the swing motor 65 is operated so that the workbench 50 is positioned from the second workbench position to the first workbench position in conjunction with the reduction operation of each jack 13. good.

Further, although not particularly mentioned in the above-described embodiment, when the swing operation switch 114 is operated to move the workbench 50 to the second workbench position in the state where the boom 30 is stored, or when the boom 30 is operated. When the jack operating device 115 is operated to store the jack 13 in a state where the workbench 50 is located at the position of the second workbench, an alarm device for notifying the operator that the jack 13 cannot be operated is provided. It may be provided. This warning device may emit a warning sound by a speaker or the like, may emit light by a warning light, or may emit a warning by a color or a character by a panel or the like.

Further, although the refraction boom type aerial work platform 1 shown in the above embodiment is configured to travel by the tire wheels, it does not have to travel by the tire wheels and travels by a crawler device or the like. There may be. Alternatively, it may be an aerial work platform for orbital traveling equipped with wheels for orbital traveling, and an aerial work platform for both track and land equipped with both tire wheels and wheels for orbital traveling. .. Further, even for aerial work platforms other than the refraction boom type, the workbench is hung down and supported by the tip of the boom, and the workbench is arranged at a position lower than the boom in the boom retracted state. If so, the present invention can be applied.

1 Aerial work platform 10 Traveling body 20 Swing platform (elevating mechanism)
30 Refraction boom (elevating mechanism)
31 Lower boom 32 Upper boom 50 Workbench 60 Workbench support mechanism 65 Swing motor 100 Controller (elevation operation control device, boarding discrimination device)
101 Swing operation control unit 102 Jack operation control unit (jack operation control device)
114 Swing switch

Claims (4)

A traveling body capable of traveling, a plurality of jacks provided on the front, rear, left and right sides of the traveling body to support the traveling body, an elevating mechanism provided on the traveling body, and an elevating mechanism supported by the elevating mechanism. An aerial work platform having a work table, a jack operation control device for controlling the operation of the plurality of jacks, and an elevating operation control device for controlling the operation of the elevating mechanism.
The elevating mechanism includes a boom that can move up and down and is stored in a state of being laid down on the traveling body, and a workbench support mechanism that is provided at the tip of the boom and supports the workbench so as to be horizontally swivelable. Have and
The workbench support mechanism has the workbench in a state where the boom is stored on the traveling body, the first workbench position where the workbench is located below the boom in a plan view, and the boom. An aerial work platform characterized by being configured to support it so that it can be positioned at the position of the second workbench, which is located off the left and right sides from below. In a state where the boom is stored on the traveling body,
When the plurality of jacks support the traveling body, the workbench support mechanism allows the workbench to be positioned at the second workbench position.
When the plurality of jacks do not support the traveling body, the workbench support mechanism is configured to restrict the workbench from being positioned at the second workbench position. The aerial work platform according to claim 1. In a state where the boom is stored on the traveling body,
When the plurality of jacks support the traveling body,
When the workbench is in the position of the first workbench, the jack operation control device allows the plurality of jacks to release the support of the traveling body.
The present invention is characterized in that when the workbench is in the position of the second workbench, the plurality of jacks are configured to restrict the release of support of the traveling body by the jack operation control device. The aerial work platform described in 1 or 2. A boarding determination device for determining whether or not a worker is on the workbench is provided.
In a state where the boom is stored on the traveling body,
When it is determined by the boarding determination device that the worker is not on the workbench, the workbench is allowed to move by the workbench support mechanism.
Claim 1 is characterized in that when it is determined by the boarding determination device that a worker is on the workbench, the movement of the workbench is restricted by the workbench support mechanism. The aerial work platform described in any of 3 to 3.

Images