JPH0663599U - Platform control device for aerial work platforms - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a work platform control device for an aerial work vehicle that does not exceed the set work platform lift when the work platform is moved at a work site with height restrictions. [Structure] Boom 1 based on an operation signal from an operating means
3 has a controller for controlling the ups and downs and the expansion and contraction operation. This controller compares the actual lift of the workbench 14 calculated based on the detection signals from the boom extension amount detector, the boom hoisting angle detector, and the vehicle body tilt angle detector with the set lift Hb set by the lift setting means. If the actual lift does not exceed the set lift Hb, the hoisting and retracting operation of the boom 13 is controlled based on the signal from the operating means, and if the actual lift reaches the set lift Hb, the operating means controls the boom. Regardless of the operation signal of, the boom 13 is raised and lowered and expanded and contracted within the set lift range Hb. This prevents the workbench 14 from interfering with the ceiling 40 even when working indoors.

Description

[Detailed description of the idea]

[0001]

[Industrial fields of application]

This invention is a workbench movement range attached to the tip of a boom that can be raised, lowered, and stretched freely. It relates to an aerial work platform capable of regulating the enclosure, and furthermore, a work platform that can be moved vertically. Work on aerial work platforms that control boom hoisting and telescoping operations when moving It relates to a platform control device.

[0002]

[Prior art]

A boom that can be stretched and raised freely is installed on the vehicle body, and a workbench is attached to the tip of this boom. In the attached aerial work platform, the boom can be hoisted and extended during work. Work is performed by moving the work table to an arbitrary working position. Normally, the operator Boom hoisting and telescoping operations can be performed by manually operating steps (operation levers, operation switches, etc.) Boom hoisting and telescoping operations are independently controlled. be

[0003] Here, to obtain a large working radius using such aerial work platform When working with the workbench extended, move the workbench in the direction of the vehicle body In this case, the boom must be raised and lowered. It is possible to move the workbench in the direction of the vehicle body.

[0004]

[Problems to be solved by the invention]

However, according to such an operation method, when working indoors, Since there is a limit to the height, if you raise the boom while it is extended, the work table will be lowered to the ceiling, etc. may come into contact with Therefore, it is necessary to move the workbench in the direction of the vehicle body while keeping it in a high place. To move, only move horizontally without moving the platform vertically. For this purpose, the boom must be raised and lowered as well as retracted. This operation has to be performed at the same time, and there is a problem that this operation requires skill.

[0005] The present invention was made in view of such problems, and When moving the work platform at the site, it may exceed the set lifting height of the work platform. To provide a work platform restricting device for a vehicle for work at height, which enables safe work to be performed without It is intended to

[0006]

[Means for solving the problem]

In order to achieve the above objects, there is provided a work at height equipped with a workbench regulation device according to the present invention. In the vehicle, the boom is hoisted and retracted based on the operation signal from the operation means. It has a controller to control. This controller detects the amount of boom extension. based on detection signals from the stage, boom hoisting angle detection means and vehicle body tilt angle detection means Comparing the calculated actual lift of the workbench with the set lift set by the lift setting means, If the actual lift does not exceed the set lift, the boom will It controls undulation and telescopic operation, and when the actual lift reaches the set lift, the operation means Boom hoisting and telescoping operation within the range of the set lifting height regardless of the operation signal from these let it happen

[0007]

[action]

With such a workbench regulating device, when the workbench is moved, the set lifting height of the workbench is Raise and extend the boom within the range of . Therefore, there are no height restrictions on the work site. If there is a limit, by setting the lift in advance within the range of this limit, Do not exceed the limits when moving the platform vertically at height. stomach.

[0008]

【Example】

Preferred embodiments of the present invention will be described below with reference to the drawings. first, An aerial work vehicle equipped with a work platform control device according to the present invention will be described with reference to FIG. clarify. In the vehicle for high lift work 10, there is a A swivel base 12 is provided, and the base end of a boom 13 is pivotally attached to the top of the swivel base 12 . is The boom 13 consists of a plurality of boom members telescopically (telescopic). ), and can be freely telescopically operated by the telescopic operation of the boom telescopic cylinder (not shown). be. Also, the boom 13 is provided between the swivel base 12 and the boom 13 . It can be raised and lowered freely by the expansion and contraction operation of the raising and lowering cylinder 15 . At the tip of boom 13 A workbench 14 is provided which is maintained horizontally at all times by a leveling mechanism (not shown). is The vehicle body 11 includes a swivel drive means (not shown) for driving the swivel base 12 to swivel. ) is provided, and the swivel base drive means includes a hydraulic motor or the like that is operated by hydraulic pressure. Used.

[0009] In the aerial work vehicle 10 configured in this manner, the boom 13 is raised and lowered, and the expansion and contraction operations are performed. Operation is provided by a control circuit such as that shown in FIG. This control circuit controls boom 1 A boom extension amount detector 16 for detecting the extension amount of 3, and a boom 13 for detecting the hoisting angle. boom hoisting angle detector 17 and a vehicle body tilt angle detector for detecting the tilt angle of the vehicle body 11 18. The detection signals from these detectors are then sent to the controller 2 0. In addition, operation means 19 for raising and lowering the boom 13 and performing expansion and contraction operations and a lifting height setting means 21 for setting the lifting height of the workbench 14, and these signals is also sent to the controller 20 .

[0010] Based on the control signal from the controller 22, the switching valve 22 operates the telescopic cylinder. from the hydraulic pump 26 to the hoist 23, the hoisting cylinder 24 and the swivel drive means 25. Controls the supply and discharge of hydraulic pressure. As a result, the boom 13 can be raised and lowered freely. can be done.

[0011] Next, indoors, an aerial work vehicle equipped with a work platform regulation device according to the present invention The operation when using it to perform work will be described. Extend the boom 13 and The workbench 14 was positioned at a high place when working with a large working radius. When there is a need to move the pump horizontally while it is still open, when there is no limit to the lifting height, such as outdoors , by raising the boom as it is, the position of the workbench 14 is not lowered. horizontal movement is possible. However, when working indoors, The lifting height of the workbench 14 may be limited by the ceiling or the like. Here, aerial work vehicle 1 When the height from the ground plane 30 where 0 is grounded to the ceiling 40 is Ha, the height of the workbench 14 is The movable lift is designed to prevent interference between the workbench 14 and the ceiling 40. Distance Hb from point A where the platform 14 is grounded to point B which does not interfere with the ceiling becomes.

[0012] After moving the workbench 14 from point A to point B, while maintaining the height of workbench 14 In order to move horizontally (in the direction of the aerial work vehicle 10), the boom 13 must be raised. It is necessary to simultaneously perform the actuation and the contraction actuation. Here, boom retraction is preferred over boom retraction. Since the workbench 14 interferes with the ceiling if the raising movement of the system precedes, it is manually Skill is required to perform each operation. Therefore, the workbench regulating device according to the present invention Therefore, it operates.

[0013] When operating with this workbench regulating device, first, the lifting height setting means 21 to set the movable lifting height Hb. Then, the controller 20 extends the boom Detection from volume detector 16, boom hoisting angle detector 17 and vehicle body tilt angle detector 18 Based on the signal, the position of the worktable 14 is calculated, and the actual lifting of the worktable 14 with respect to this position is performed. When comparing the set head set by the set head and the set head set by the head setting means 21, the set head is determined. When the fixed lift is not exceeded, the boom 13 is raised based on the signal from the operation means 19. Controls bending and stretching operations. Therefore, movement of work table 14 from point A to point B is the operation within the range of the set lift, so it is operated based on the signal from the operation means 19 move.

[0014] The boom 13 is hoisted and stretched based on the signal from the operation means 19. Therefore, the actual lift of the workbench 14 is the set lift H set by the lift setting means 21 When reaching b, regardless of the operation signal from the operation means 19, the set lift Within the range of , the boom 13 is operated such as raising and lowering and extending and contracting. Therefore, workbench 14 , from point B to point C, by raising and lowering the boom 13 of the operation means 19 and move horizontally while maintaining the lift Hb.

[0015] In addition, the above operation is for the case where the contact surface is horizontal. According to the worktable regulating device according to the invention, the ground plane may be a slope. Workbench 1 In calculating the actual lift of 4, only with the boom 13 hoisting angle and expansion and contraction amount, If the ground surface is a slope, the range of the initially set lifting height will be reduced as the workbench 14 moves. There is a case where it exceeds and interferes with the ceiling. However, the worktable regulation device according to the present invention In order to use the inclination angle of the vehicle body 11 as a condition for calculating the actual lift, Even if the surface is a slope, the set lifting range is not exceeded.

[0016]

[Effect of invention]

As described above, the work platform regulating device for a vehicle for work at height according to the present invention can be controlled by the operation means. It has a controller that controls boom hoisting and telescoping based on operation signals. be. This controller is equipped with a boom extension detector, boom hoisting angle detector and body The actual lifting height of the workbench calculated based on the detection signal from the tilt angle detector and the setting manual for lifting height Compare the set lift set by the stage, and if the actual lift does not exceed the set lift, Based on the signal from the operation means, it controls the hoisting and telescoping operation of the boom, and the actual lifting height is When the set lift is reached, regardless of the operation signal from the operating means, the set lift The boom is hoisted and stretched within a range of about. This allows the boom to be extended. Raise the work table to a high place while working with a large working radius. Even if the boom is moved horizontally while the Even when working indoors for retraction work, etc., the workbench should not interfere with the ceiling. never

[Brief description of the drawing]

FIG. 1 is a side view of an aerial work vehicle equipped with a work platform restricting device according to the present invention;

2 is a block diagram of a worktable restraining device according to the present invention; FIG.

[Description of symbols]

10 aerial work platform 11 car body 12 swivel base 13 Boom 14 Workbench 15 boom hoisting cylinder

Claims (1)

[Scope of utility model registration claims] 1. A base end portion is pivotally mounted on a vehicle body,
A boom that can be raised and lowered and can be telescopically arranged, an operation means for operating the boom, a work table attached to the tip of the boom so that it is always horizontal, and the boom boom extension amount detection means for detecting an extension amount; boom hoisting angle detection means for detecting a boom hoisting angle; vehicle body inclination angle detection means for detecting an inclination angle of the vehicle body; a lifting height setting means for setting the lifting height of the workbench, and calculating the position of the workbench based on detection signals from the boom extension amount detecting means, the boom hoisting angle detecting means, and the vehicle body tilting angle detecting means, and performing work at this position The actual lifting height of the platform is compared with the set lifting height set by the lifting height setting means, and if the actual lifting height does not exceed the setting lifting height, the hoisting and telescoping operation of the boom is performed based on the signal from the operating means. Control is performed, and when the actual lift of the working platform reaches the set lift, regardless of the operation signal from the operation means, the set lift set by the lift setting means is not exceeded. , and a controller for controlling the hoisting and retracting operations of the boom.