JPH081275Y2 - Lifting control device for moving platform in lift truck - Google Patents

Description

[Detailed Description of Device] a. The purpose of the invention (industrial field of application) The present invention relates to a lift control device for automatically controlling the lift of a lift work vehicle equipped with a carriage that moves along a guide rail.

(Prior art) A lift work vehicle equipped with a moving table (bucket) that moves up and down is used for lifting work of distribution electrical equipment materials to be mounted on electric poles and for carrying furniture etc. upstairs when moving. Often. As a conventional lift truck,
It is well known that a telescopic ladder-shaped guide rail is mounted on a vehicle body, and a movable table is vertically movable on the guide rail.

However, in such a lift work vehicle, since the guide rails are continuously connected in a telescopic manner and it is necessary to provide a wire or the like for expanding and contracting the guide rails, an insulating part is provided in the middle of the guide rails. Is difficult. For this reason, for example, when carrying out lifting work of distribution equipment on a utility pole using this lift work vehicle, it is not suitable for work in a state in which electric wires on the utility pole are energized, that is, live line work. was there.

For this reason, the applicant has installed a telescopic boom on the vehicle body, arranged the base boom rail along the base boom constituting the boom, and installed the tip boom rail on the upper part of the tip boom. We have proposed a lift work vehicle in which a movable platform is installed between the boom rails with the boom fully retracted. In the case of this lift truck, after moving the platform from the base boom rail to the tip boom rail in the fully retracted state of the boom, the tip boom is extended and retracted while the platform is mounted on the tip boom rail. Is designed to be raised and lowered.

In this lift work vehicle, since both boom rails are separated when the tip boom is extended, it is possible to electrically insulate between the moving platform and the vehicle body by insulating the booms from each other. It can also be used. In addition,
It has been well known and widely used in aerial work vehicles to construct the tip boom or the intermediate boom with an insulating member.

(Problems to be Solved by the Invention) When performing the operation control of the lift work vehicle proposed by the present applicant as described above, the movement of the movable table between the boom rails must be performed with the boom being almost fully retracted. In addition, the boom extension operation must be performed with the movable table completely moved on the tip boom rail. That is, this operation control requires two control operations, that is, a start-up control operation of the mobile platform and a boom extension / contraction control operation, and both operations need to be performed while confirming the position of the mobile platform.
There is a problem that the control operation is likely to be complicated and there is a risk of erroneous operation.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lifting / lowering control device for a moving table in a lift work vehicle that can automatically move up and down the moving table and whose operation control is simple.

B. Configuration of the Invention (Means for Solving the Problem) In order to achieve the above object, in the present invention, a telescopic boom is mounted on a vehicle body, and a base boom rail is arranged along the base boom forming the boom. Installed, the tip boom rail is placed above the tip boom, and a moving stand that can move between the boom rails in the fully retracted state is attached, and a drive means for moving the moving stand on the boom rail is installed. The lift work vehicle is configured by arranging it, and after moving the moving table from the base boom rail to the tip boom rail in the fully retracted state of the boom, the tip boom is expanded and contracted with the moving table placed on the tip boom rail. The moving table is moved up and down. Then, in the lift work vehicle having such a configuration, the lifting control device according to the present invention, the operation means (for example, operation buttons, levers, etc.) for outputting a signal for raising and lowering the moving platform, and the signal And a control means for automatically performing the lifting / lowering operation control of the moving base.

(Operation) When the elevating control device having the above-described configuration is used, when the elevating operation means is operated to output the signal for raising the movable table, the tip boom is contracted to the fully contracted state, and then the driving means is operated. When the moving platform is moved from the proximal boom rail to the distal boom rail, and then the distal boom is extended, the work is automatically performed, while the lifting operation means is operated to output a signal for lowering the moving platform. After the tip boom is reduced to the fully retracted state, the moving means moves the carriage from the tip boom rail to the base boom rail, and the work of starting the base boom rail downward is automatically performed. Let it be done.

In order to raise and lower the movable table in the lift work vehicle having such a configuration, it is usually necessary to accurately perform boom extension / contraction control and movement control of the movable table on the guide rail in a predetermined order. However, if this lifting control device is used, the lifting / lowering of the movable table can be automatically performed only by operating the lifting operation means (operation buttons, levers, etc.).

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

First, a lift work vehicle equipped with a lifting control device according to the present invention will be described with reference to FIGS. 1 and 2.

Outriggers 3 are arranged at four positions on the front, rear, left and right of the vehicle body 2 of the lift work vehicle 1. When you work
These outriggers 3 project laterally from the vehicle body 2 and extend downward to support the vehicle body 2. A swivel base 4 is attached to the rear of the vehicle body 2 so as to swivel with respect to the vehicle body 2. On the swivel base 4, an intermediate boom 5b is telescopically inserted into a base end boom 5a, and a distal boom 5c is telescopically inserted into the intermediate boom 5b.
The proximal end is pivotally attached. The telescopic boom 5 can be hoisted by the telescopic operation of the hoisting cylinder 6 mounted between the base end boom 5a and the swivel base 4.

In this lift work vehicle 1, the boom portion of the tip boom 5c is made of an electrically insulating material so that it can be used for live work.

A lift working device is mounted on the upper part of the telescopic boom 5 having such a configuration. This device includes a base boom rail 7, a tip boom rail 8, a sub rail 9, and a lifting device.
It is composed from 10 as follows.

A base boom rail 7 composed of two guide rail members parallel to each other over substantially the entire length is attached to the upper portion of the base boom 5a via a rail support member 7a. On the upper part of the tip of the tip boom 5c, a tip boom rail 8 composed of two guide rail members parallel to each other is arranged at the same height as the base boom rail 7 to hold the rail holding member.
It is attached via 8a. The width between the two rail members of the tip boom rail 8 is equal to that of the base boom rail 7.
Narrower than that. Further, when the telescopic boom 5 is in the fully contracted state, the rear end portion of the front end boom rail 8 is parallel to and overlaps with the front end portion of the base end boom rail 7 by a certain length.

Further, a sub-rail 9 configured similarly to the tip boom rail 8 is attached to the base end of the base boom rail 7 so as to be slidable (extendable / contractible) rearward with respect to the base boom rail 7.

The rail members of the base boom rail 7, the tip boom rail 8 and the sub rail 9 are, as shown in FIG.
The rail member of the base end boom rail 7 is arranged such that the U-shaped openings face inward, and the rail members of the tip boom rail and the sub-rail 9 are composed of members each having a U-shaped cross section. The openings are arranged so as to face outward, that is, to face the openings of the rail members of the base boom rail 7. The U-shaped inner surfaces of these rail members are referred to as guide portions.

An elevating device (moving table) 10 is mounted on the base boom rail 7. This lifting device (moving table) 10 is mounted. The lifting device 10 is a moving device 11 and a bucket device.
It consists of 12. As shown in FIGS. 3 and 4, the moving device 11 includes a chassis 13 and four front, rear, left and right sides of the chassis 13.
It is composed of a roller unit RU arranged at a certain position.

Each roller unit RU has a first roller 14 and a second roller 14, respectively.
It is composed of a roller 15 and a roller mounting member 16, a first roller 14 is rotatably mounted on the outer side of the roller mounting member 16, and a second roller 15 is arranged inside the roller mounting member 16 in parallel with the first roller 14. It is mounted rotatably. The diameters of the rollers 14 and 15 are slightly smaller than the height thereof so that they can be guided by the guide portion of the rail member. The mounting width between the first roller 14 and the second roller 15 is
The width is set corresponding to the width of one rail member of the base boom rail 7 and the rail member of the tip boom rail 8 or the sub rail 9 facing the rail member.

In the roller unit RU thus configured, the roller mounting member 16 is fixed to the lower portion of the chassis 13 and supports the chassis 13. A lateral guide roller 17 is attached to a lower portion of the chassis 13 at a position adjacent to the four roller units RU so as to be horizontally rotatable via a guide roller supporting member 13a. The lateral guide rollers 17 guide the roller unit RU and the chassis 13 in the rail direction of the guide rails (7, 8 and 9). A bucket support 18 is attached to the upper part of the chassis 13 to support the bucket device 12.

Therefore, as shown in FIGS. 1 and 2, the telescopic boom 5 is in the fully retracted state, and the rear end of the tip boom rail 8 overlaps the tip of the base boom rail 7 by a certain length. In the state, the roller unit RU can smoothly move between the base boom rail 7 and the tip boom rail 8, and the lifting device 10 can move between both boom rails 7 and 8. Of course, the lifting device 10 can also be moved between the base boom rail 7 and the subrail 9, and when the telescopic boom 5 is fully retracted, the lifting device 10 extends from the lower end of the subrail 9 to the tip boom rail 8. These rails 7, 8 and 9 can be freely moved to the tip of. This lifting device 10 can be moved. A winch (driving device) 29 for moving the lifting device 10
Is attached to the tip of the tip boom 5c.

The bucket device 12 includes an undulating arm 21, a leveling cylinder 22, a swing arm 23, a bucket 24, and a swing motor.
It consists of 25. The undulating arm 21 has an arm portion 21a.
The upper part of the link part 21b is pivotally attached to the upper part of the bucket support base 18, while the tip of the rod 22a of the leveling cylinder 22 is pivotally attached to the lower part of the link part.

The rear end of the leveling cylinder 22 is attached to the chassis 13
It is pivotally attached to a cylinder support portion 13b extending from the rear portion. In addition, the swing arm 23
The base end of the swinging motor 25
It is attached so that it can be swung freely. Further, a bucket 24 for mounting equipment etc. is attached to the tip of the swing arm 23. In the bucket 24 of the bucket device 12 having such a configuration, when the telescopic boom 5 is raised and lowered and the guide rails (7, 8 and 9) and the movable base 11 are tilted, the leveling cylinder is moved according to the tilt.
By extending and retracting the hoisting arm 21 to raise and lower the arm 22, the hoisting arm 21 is always kept horizontal (see FIG. 1), while on the other hand, as shown in FIG.

In the lifting work vehicle 1 having the above-described structure, the lifting device 10 is lifted up and down, that is, the bucket 24 is lifted up and down.
Move it up to the tip boom 8 and then the tip boom 5c
Also, extend the intermediate boom 5b. For this reason, when elevating the elevating device 10, it is necessary to perform the extension / contraction control of the telescopic boom 5 and the operation control of the winch 29 in a predetermined order. However, in the lift work vehicle 1, this is automatically performed. It has a lifting control device, which will be described below.

This lifting control device includes an operation box 30 connected to the vehicle body 2 via a control cable 30a, and an operation box 30
And a controller (not shown) that performs a predetermined operation control according to a signal output according to the operation of the operation button. The operation control by this controller detects a signal from the fully retracted detection sensor 35 that detects the fully retracted state of the telescopic boom 5 and whether or not the chassis 13 of the lifting device 10 is positioned on the tip boom rail 8. This is performed based on the signal from the movement detection sensor 36.

The operation box 30 is, as shown in FIG.
It has ten ascending and descending buttons 31a, 31b, left and right swing buttons 32a, 32b of the bucket 24, and an emergency stop button 33. By pressing the raising button 31a, the operation control for automatically raising the lifting device 10 is performed, and the lowering button 31a
The operation control for automatically lowering the elevating device 10 is performed by pressing b. Note that 31c, 31d, 32c, and 32d are lamps that display the corresponding buttons when they are pressed.

This operation control will be described based on the flowchart of FIG.

In this control, first, it is determined whether or not the ascending button 31a is pressed (ON) (step S1), and this is turned OFF.
In case of, it is determined whether or not the descending button 31b is pressed (ON) (step S11), and in the case of any button being OFF, this flow is ended as it is.

When the raising button 31a is ON, whether or not the lifting device 10 is on the tip boom rail 8 is determined by the movement detection sensor 36.
Judgment is made based on the signal from (step S2). If the lifting device 10 is not on the tip boom rail 8, first,
The telescopic boom 5 is not fully retracted (steps S3, S4), the winch 29 is hoisted, and the lifting device 10 is moved to the rails 7, 8,
Move up on 9. When it is detected that the lifting device 10 does not move onto the tip boom rail 8 due to hoisting of the winch 29 (step S6), the operation of the winch 29 is stopped and the telescopic boom 5 is extended (step S6).
S7). If the lifting device 10 is already located on the tip boom rail 8 when the raising button 31a is pressed, the process proceeds from step S2 to step S7, and the telescopic boom 5 is extended as it is.

When the descending button 31b is ON, the process proceeds from step S11 to step S12, and it is determined whether or not the lifting device 10 is located on the tip boom rail 8. Tip boom rail 8
If it is located above, first, the telescopic boom 5 is contracted to the fully contracted state (steps S13, S14), and then the winch 29 is rewound to move the lifting device 10 to the rails 7, 8 ,.
9 Lower on. If the lifting device 10 is not located on the tip boom rail 8, it is already on the base boom rail 7 or the sub rail 9, so the process proceeds from step S12 to step S15, and the winch 29 is unwound. It is operated to lower the lifting device 10 on the rails 8 and 9.

As described above, when the lifting control device is used, the lifting device 10 can be automatically moved up and down by simply pressing the lifting or lowering buttons 31a and 31b.

If the telescopic boom 5 is extended while the lifting device 10 is positioned on the tip boom rail 8, the tip boom rail 8 separates from the base boom rail 7. Here, the tip boom 5c is made of an insulating material, and the lifting device 10 is electrically insulated from the vehicle body 2. For this reason,
It is also possible for an operator to carry out live work while riding on the bucket 24 of the lifting device 10. A hydraulic hose is provided between the lifting device 10 and the vehicle body 2. Since this hose is made of rubber and oil flows inside, it does not affect electrical insulation. .

C. Effect of the Invention As described above, according to the lifting control device of the present invention, when the lifting operation means is operated to output the signal for raising the moving platform, the tip boom is contracted to the fully retracted state and then driven. Means to move the platform from the base boom rail to the tip boom rail, and then automatically extend the tip boom, while operating the lifting operation means to send a signal to lower the platform. If you output it,
After the tip boom is reduced to the fully retracted state, the moving means moves the tip of the boom from the tip boom rail to the base boom rail, and the work of moving the base boom rail downward is automatically performed. As a result, the moving table can be easily and automatically moved up and down simply by operating the up-and-down operation means (operation buttons, levers, etc.).

[Brief description of drawings]

1 and 2 are a front view and a plan view of a lift work vehicle provided with a lifting control device according to the present invention, and FIGS. 3 and 4 are front views showing a lift device used in this lift work vehicle. FIG. 5 is a front view of a lifting / lowering control operation box of the lifting / lowering device, and FIG. 6 is a flowchart showing lifting / lowering control by the lifting / lowering control device according to the present invention. 2 …… Body, 4 …… Swivel base 5 …… Boom, 7,8,9 …… Rail 10 …… Lift device, 13 …… Chassis 29 …… Winch, 30 …… Operation box

Claims (1)

[Scope of utility model registration request] 1. At least undulatingly arranged on a vehicle body,
A base boom attached to the vehicle body and a telescopic boom having a tip boom that can extend and contract with respect to the base boom, a base boom rail arranged along the base boom, and the tip boom. A distal boom rail disposed at the distal end of the, a movable base movable on the base end and the distal boom rail, and a drive means for moving the movable base on the proximal end and the distal boom rail, When the tip boom is in a fully contracted state, the lower end of the tip boom rail and the upper end of the base boom rail are close to each other, and the movable table is movable between the both boom rails. A lift work vehicle configured to extend and retract the movable table by extending and retracting the tip boom in a state where the movable table is moved upward. A lifting / lowering control device for a mobile platform in a lift work vehicle, comprising a lifting / lowering operation means for outputting a signal for lifting / lowering the mobile platform, and a signal for lifting the mobile platform from the lifting / lowering operation means. After reducing the tip boom to a fully contracted state, the drive means is used to move the moving table from the base boom rail to the tip boom rail, and then operation control is performed to extend the tip boom. When a signal for lowering the movable table is output from the elevating operation means, the tip boom is reduced to a fully contracted state, and then the driving table moves the movable table from the tip boom rail to the base boom rail. And a control means for performing an operation control for moving the base end boom rail downward while moving it upward. Lifting and lowering control device for a mobile platform in a lift truck.