JPH045520Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to the work platform when turning, for example, in an aerial work vehicle equipped with a work machine such as a winch that can lift heavy objects to the work platform. The work platform and work equipment of an aerial work vehicle are designed to prevent interference between the work platform and work equipment such as a winch, thereby preventing damage to the work platform, work platform cover, etc., and ensuring work safety. This invention relates to an interference prevention device.

[Prior art and its problems]

Currently, high-altitude work vehicles are being introduced as work machines for various types of work, including installation of signboards, neon signs, etc. at high places, painting work on buildings, etc., and are used to automate and efficiently carry out the work. It is being

This type of aerial work vehicle is attached to the tip of a boom that can be raised, extended, and rotated, and has a work platform that can swing freely around a pivot that always maintains a vertical state.
A worker sits on this workbench and performs predetermined work such as power distribution line work and transformer removal work. For example, when installing billboards, neon signs, etc. at high places, we talk about winches, which are work equipment used to lift heavy objects.This winch is usually attached to the tip of the boom, and the workbench is attached to the neck. It is rotatably mounted above a swingable pivot. By the way, in this type of conventional aerial work vehicle, after the workbench and winch are rotated in a desired direction and a predetermined work such as attaching a signboard is completed, the winch is fixed to the pivot shaft.
In reality, this is done by inserting a locking pin or the like between the winch and the shaft.

However, if the workbench is oscillated left and right with the winch locked, the workbench will interfere with the winch, which is fixed in place, as the workbench and the winch are coaxial, causing the workbench to sway. , damage the workbench cover or winch, etc.
This has the disadvantage that it can also pose a danger to workers.

In order to prevent such a situation, the worker must always unlock the winch before swinging the workbench, which is a cumbersome task, and also requires the winch to be unlocked. Even when the work is in progress, various tasks such as swinging the workbench must be performed while always paying close attention to the proximity of the workbench and the winch, which is detrimental to work efficiency and work safety. This has the problem of being inconvenient.

[Means and actions for solving problems]

In order to solve the above-mentioned problems, this invention attaches a boom that can be raised and lowered to a turntable mounted on a trolley, etc., and a work platform and a work machine such as a winch are attached to the tip of the boom to coaxially oscillate and swivel. In the above-mentioned aerial work vehicle, the workbench is provided with an operation means for swinging the workbench, a detection means for detecting proximity of the workbench and the work equipment, and a detection means for detecting proximity of the workbench to the workbench. By providing an interference prevention means that restricts the swing operation of the work platform in the direction of interference with the work machine when it is detected that the work platform approaches the work platform, the work platform is When a person approaches a work machine such as a winch and tries to interfere with it, the swing operation of the work platform that interferes with the work machine is automatically stopped, and the approach status of the work platform and work machine is automatically stopped. The purpose of this invention is to provide a device for preventing interference between a work platform and a work machine in an aerial work vehicle, which eliminates visual confirmation work, thereby improving work efficiency and work safety. be.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an aerial work vehicle used in the present invention. This aerial work vehicle 1 has a turntable 2 rotatably provided on a movable trolley, and a telescopic boom 3 on the turntable 2. The base of is pivoted,
The telescoping boom 3 is configured to be raised and lowered by an undulation cylinder 4 provided between the turntable 2 and the telescoping boom 3, and to be extended and contracted by a telescoping cylinder 5 built in along the longitudinal direction of the telescoping boom 3. There is. In addition, a first pivot 3a is pivotally supported at the tip of the telescopic boom 3, and a balance cylinder installed between the tip of the telescopic boom 3 and the first pivot 3a is telescopically operated in conjunction with the raising and lowering operation of the telescopic boom 3. The first pivot 3a is always maintained in a vertical state regardless of the ups and downs of the telescopic boom 3, and a workbench 6 is attached to the first pivot 3a so as to be able to swing freely. As a result, the head swings left and right about the first pivot 3a. An upper operating device 7 is attached to the side of the workbench 6 to centrally perform operations such as starting and stopping the engine and swinging the workbench 6. Reference numeral 8 denotes a winch which is a working machine, and a mounting arm 9 at the base end thereof is connected to a first pivot 3a.
By being attached to a second pivot shaft 3a' which is rotatably attached to the upper end of the rotor, it is possible to freely pivot relative to the first pivot shaft 3a.

"Example of mechanical interference prevention device" shown in Figure 2
The interference prevention device between the work platform and the working machine in the aerial work vehicle according to the present invention will be explained based on "an example of the electrical interference prevention device" shown in FIG.

"Example of Mechanical Interference Prevention Device" Reference numeral 10 denotes an operating lever for swinging the workbench 6, which is provided on the operation panel of the upper operating device 7, and is equipped with a hydraulic pressure lever for controlling the swinging action of the workbench 6. It is connected to valve 17.

A link device 13, which constitutes a detection means for detecting the proximity of the winch 8, is attached via a rod 12 to the operating lever 10 for operating the swing and rotation of the workbench 6. is transmitted to the operating lever 10, the operating lever 10 is automatically pushed back, and the workbench 6
The swinging operation of the head is stopped.

By the way, as shown in the figure, the link device 13 has L-shaped links 13a, 13a arranged on the left and right sides, which are linked together by a connecting bar 13b, and the displacement of the left and right links 13a, 13a is This is done by pressing one of the protrusions 14a, 14a installed on the links 13a, 13a, respectively, in the vicinity of the mounting arm 9 of the winch 8 mentioned above.

"Example of Electrical Interference Prevention Device" 20 is a detection device (detection means replacing the link device 13, see FIG. 3a), a limit switch protruding left and right, and a winch 8 as described above attached to either 21a or 21b. When the mounting arm 9 comes into contact with it, one of the relays 22 and 23 shown in FIG. 18, which normally blocks communication between the hydraulic power source and the hydraulic valves 17, 18, and switches when the solenoid is energized to communicate the hydraulic power source and the hydraulic valves 17, 18. It is configured to disconnect and connect the solenoid of the switching valve 19 and the power source.

The relay 22 has contacts 22 shown in FIG. 3b.
A (a contact that closes when the relay 22 is energized and returns to open when the relay 22 is demagnetized) and a contact 22b (a contact that opens when the relay 22 is energized and closes when the relay 22 is demagnetized) are provided. Contact 23a shown in Figure b (closes when relay 23 is energized,
A contact 23b (a contact that opens when the relay 23 is energized and closes when the relay 23 is demagnetized) is provided. A winch right rotation operation switch 24 and a work platform left rotation operation switch 25 are connected in parallel to the power supply E side of the contact 22a, and a winch left rotation operation switch 26 is connected to the power supply E side of the contact 23a. and work platform right rotation operation switch 27 are connected in parallel, and contact 2
The sides of 2a, 22b, and 23a opposite to the power supply E side are connected to the solenoid of the electromagnetic switching valve 19.

The operation of the present invention configured as described above will be explained below.

First, the aerial work vehicle 1 is moved and installed at the target work site, and then the telescopic boom 3 is raised and extended, and the turntable 2 is rotated in a predetermined direction and the work platform 6 attached to the tip is moved. position in the desired working position. These operations are accurately performed by a well-known control device mounted on the aerial work vehicle 1.

"About the operation of an example of a mechanical interference prevention device" When operating the operating lever 10 to swing the workbench 6 in the left-right direction, the workbench 6 turns beyond a predetermined turning angle and the winch 8 When the attachment arm 9 contacts the left protrusion 14a of the link device 13, one link 13a of the link device 13 rotates as the protrusion 14a retracts. Since the rotation of the link 13a is transmitted to the operating lever 10 via the rod 12, the operating lever 1
0 is pushed back. Therefore, the rotation movement of the work platform 6, which was a right rotation in the above operation, is caused by the operation lever 1.
It stops by pushing back 0. Therefore, interfering approach of the workbench 6 to the winch 8 is immediately stopped, and damage to the workbench 6 or the cover of the workbench 6 due to a collision is prevented. still,
When the workbench 6 turns to the left and abnormally approaches the mounting arm 9 of the winch 8 from the right, the operation is simply the opposite of the above, and there is no particularly different effect, so a detailed explanation will be omitted.

"About the operation of an example of an electrical interference prevention device" First, in the electrical interference prevention device (see Figure 3b), if the workbench 6 and winch 8 are not abnormally close, both relays 22 and 23 are in the demagnetized state. Therefore, the contacts 22b and 23b of both relays 22 and 23 are closed as shown in the figure.
Therefore, the power source E is connected to the solenoid of the switching valve 19 to energize the solenoid, and the electromagnetic switching valve 19 switches to communicate the hydraulic source with the hydraulic valves 17 and 18. Therefore, both hydraulic valves 17 and 18 allow the work platform 6 and winch 8 to rotate normally in accordance with the operation of the respective operation levers 10 and 11.

Next, when the winch 8 approaches the workbench 6 abnormally and the limit switch 21a is closed, a predetermined current is supplied to the relay 22 and it becomes energized.

Therefore, the contact 22b, which was closed, becomes open, and the contact 22a, which was normally open, becomes closed. Therefore, the connection between the solenoid of the electromagnetic switching valve 19 and the power source E is cut off, the excitation of the solenoid is canceled, and the electromagnetic switching valve 19 is switched to cut off communication between the hydraulic power source and the hydraulic valves 17 and 18.
Therefore, the work platform 6, which had been turning abnormally close to the winch 8, is stopped from turning to the left in the direction of the winch 8, and interference between the two is prevented.

On the other hand, even under the above-mentioned conditions, in order to separate the workbench 6 and the winch 8, turn on the winch right rotation operation switch 24 connected in series with the contact point 22a and connect the power source E to the solenoid of the electromagnetic switching valve 19. , energizes the solenoid to switch the electromagnetic switching valve 19, and connects the hydraulic power source with the hydraulic valves 17 and 18,
The operating levers 10 and 11 provided on the two hydraulic valves 17 and 18 are operated as appropriate to swing the work platform 6 or the winch 8 to the desired position.

[Effect of idea]

As mentioned above, the present invention consists of a turntable mounted on a trolley, etc., with a boom that can be raised and lowered, and a work platform and a work machine such as a winch attached to the tip of the boom so that it can swing and swivel coaxially. In the work vehicle, the workbench is provided with an operation means for swinging the workbench, a detection means for detecting that the workbench and the work machine are close to each other, and a detection means for detecting that the workbench and the work machine are close to each other. The system is equipped with an interference prevention means that prevents the workbench from swinging in the direction of interference with the work equipment when it detects that the workbench has swung in the direction of interference with the work equipment. When approaching and attempting to interfere with the work platform, the rotation operation of the work platform in the direction of interference with the work machine is stopped, thereby preventing interference between the work platform and the work machine. Therefore, there is no need to visually confirm the proximity of the workbench and work equipment as in the past, and there is no risk of the workbench colliding with other equipment, making it extremely easy to rotate the workbench. This has the effect of improving work efficiency and further improving work safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an aerial work vehicle equipped with a device for preventing interference between a workbench and a winch according to the present invention, Fig. 2 is an enlarged plan view of the main parts of the interference preventing device, and Fig. 3a is an operation of a limit switch. Figure b is a control circuit diagram for detecting the proximity of the workbench to the winch and controlling the rotation of the workbench. 1...Aerial work vehicle, 2...Turntable, 3
...Telescopic boom, 3a...First axis, 3a'...
Second pivot, 4... Lifting cylinder, 5... Telescopic cylinder, 6... Workbench, 7... Upper operating device, 8... Winch, 9... Mounting arm, 10,
11...operation lever, 12...rod, 13...
Link device, 13a, 13a... Link child, 13
b... Connection bar, 14a... Protrusion, 17, 18...
...Hydraulic valve, 19...Switching valve, 20...Detection means, 21a, 21a...Limit switch, 2
2, 23...Relay, 22a, 22b, 23a,
23b...Contact, 24...Winch right rotation operation switch, 25...Work platform left rotation operation switch, 2
6... Winch left rotation operation switch, 27... Work platform right rotation operation switch, E... Power supply.

Claims (1)

[Scope of utility model registration request] In the above-mentioned aerial work vehicle, a boom that can be raised and lowered is attached to a turntable mounted on a trolley, etc., and a work platform and a work machine such as a winch are provided at the tip of the boom so that they can swing and rotate coaxially. The workbench includes an operating means for swinging the workbench, a detection means for detecting that the workbench and the work machine are close to each other, and when the detection means detects that the workbench and the work machine are close to each other, 1. An interference prevention device between a work platform and a work machine in an aerial work vehicle, characterized in that it is provided with an interference prevention means for restricting the turning operation of the work platform in a direction of interference with the work machine.