JP2508368Y2 - Boom interference prevention device for aerial work vehicles - Google Patents

Description

[Detailed Description of Device] a. The present invention relates to an aerial work vehicle, and further to a boom control device attached to the aerial work vehicle.

(Prior art) For electric work on electric poles, etc., a high body equipped with a boom on the body of a truck that can be lifted, retracted and swiveled, and a work platform for mounting a work vehicle at the tip of the boom. A work vehicle is used.

In many cases, the boom is capable of turning around the entire circumference in order to improve workability. In this case, a cabin (driver's cab) attached to the front of the body of the truck or a large body mounted on the body is used. If the tool box is included in the swing range of the boom and the swing operation is performed while the boom is still raised or lowered, the boom or workbench may interfere with the cabin or the tool box. In particular, in an aerial work vehicle, the operation of the boom is operated by a worker who is on the workbench, but for the worker, the lower side of the boom and the lower part of the workbench are blind spots.
Since it is difficult to grasp the positional relationship with the cabin or the like, for example, the lower part of the workbench may interfere with the upper part of the cabin.

Therefore, such an aerial work vehicle is equipped with an interference prevention device that restricts the operation of the boom so that the boom and the work table do not approach the cabin or the like by a predetermined distance (a sufficient distance without interference). ing.

In addition, in the aerial work vehicle equipped with a boom as described above,
A boom pedestal that receives and holds the middle portion of the boom having a retractable length (for example, fully retracted state) is attached. By storing the boom on the boom pedestal, the boom can be stored at a fixed position against vibration during traveling of the truck. In the state where the boom is stored on the boom pedestal, the tip portion of the boom and the lower portion of the work table are often close to the upper portion of the cabin and the tool box.

(Problems to be solved by the invention) Therefore, when the boom is retracted, the boom cannot be retracted while the interference prevention device is still operating. Therefore, it is said that the interference prevention device is switched to the non-operational state, and the operator operates the boom while paying attention not to interfere the boom and the workbench with the cabin, etc., and stores it on the boom cradle by visual inspection by the operator. As described above, there is a problem that operation of the boom during storage is troublesome and workability is poor.

In view of the above problems, in the present invention, when the boom is stored,
An object of the present invention is to provide a boom interference prevention device that automatically switches from the interference prevention control of the boom or the like to the cabin to the boom automatic storage operation control.

B. Configuration of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned object, a boom interference prevention device of the present invention comprises an undulation detector for detecting a boom undulation angle and an extension for detecting a boom extension amount. A detector and a swing detector that detects the swing angle of the boom are provided. Further, based on the signals from these detectors, the boom extension amount is a predetermined length when the boom is stored in the vehicle body, and the swing position and the undulating position of the boom are within a predetermined range with respect to the predetermined storage position with respect to the vehicle body. When it is determined that the boom is stored in the predetermined storage position, the storage control means stores the boom in the predetermined storage position, and the boom extension amount is equal to or greater than the predetermined length, or the boom swing position and the undulation position are out of the predetermined range. When it is determined that the boom is present, an interference prevention control means is provided for restricting the operation of the boom in order to prevent the boom from interfering with the bodywork on the vehicle body.

(Operation) In such a boom interference prevention device, during normal work, that is, when the boom has a length other than the predetermined storage length or is located outside the predetermined range, the boom operation is The boom and workbench are regulated by the interference prevention control means so as not to interfere with the cabin and the tool box, the boom is set to a predetermined length for storage after the work, and the position of the boom is moved within a predetermined range with respect to the predetermined storage position. When
Assuming that the boom is prepared for storage, the boom is automatically stored in the predetermined storage position by the storage operation control means.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

First, FIG. 1 shows a truck-mounted aerial work vehicle equipped with a boom interference prevention device according to the present invention.

A swivel base 3 is attached to the rear part of the vehicle body 2 of the aerial work vehicle 1, and the swivel base 3 can freely swivel with respect to the vehicle body 2 by the operation of a swivel motor (not shown here, see FIG. 2). Is. A base end of a boom 4 is pivotally attached to the upper part of the swivel base 3. The boom 4 has a tip boom 4b fitted in a base boom 4a, and can be raised and lowered freely by the operation of a hoisting cylinder 5 mounted between the swivel 3 and the base boom 4b. Is a telescopic cylinder for the base boom 4a (not shown here, see FIG. 2)
Can be expanded and contracted by the operation of. Further, a work No. 6 is attached to the tip of the boom 4 (tip boom 4b). At the time of work, the boom 3 is erected by the hoisting cylinder 5 and the boom 4 is extended by the telescopic cylinder, so that the workbench 6 is carried to a predetermined high place, and the work on the workbench 6 is carried out at a high place. . Further, a boom receiver 8 is attached to the rear of the cabin 7 of the truck. When the work is not performed, the boom 4 is placed in the fully retracted state (predetermined length for storage) and placed on the boom pedestal 8 for storage.

Next, the boom interference prevention device will be described with reference to FIG.

The boom interference prevention device 10 is composed of an undulation sensor 11, an extension sensor 12, a turning sensor 13, a storage operation calculator 14, an interference prevention calculator 15, a storage controller 16 and a regulation controller 17.

The undulation sensor 11, the extension sensor 12, and the turning sensor 13 are
These are for detecting the hoisting angle of the boom 4, the extension amount, and the turning angle of the swivel base 3 (turning angle of the boom 4). These sensors 11 to 13 are connected to the storage operation calculator 14 and the interference prevention calculator 15 via signal lines.

The storage operation calculator 14 determines whether or not the boom 4 is a fully contracted body, that is, a length for storing, based on the detection signals from the sensors 11 to 13, while the boom 4 is stored. It is determined whether or not the position is within the storage preparation range H shown in FIGS. 3A and 3B with respect to the position (predetermined storage position) mounted on the boom pedestal 8. This storage preparation range H is
As shown in FIG. 3A, the boom 4 extends horizontally at a predetermined angle around the base end of the boom 4 to the left and right of a predetermined storage position P (the chain line P corresponds to the position of the center line of the boom 4). As shown in the range component H _H and FIG. 3B, a vertical range component that spreads upward from the predetermined storage position P (slightly above the boom 4 so as not to interfere with the boom cradle 8) by a predetermined angle. ranges formed from H _P.

In the retracting operation unit 14, the boom 4 is in the fully retracted state,
Further, when it is determined that it is within the storage preparation range H, an operation signal is sent to the storage controller 16.

The interference prevention computing unit 15 calculates the length and position of the boom 4 based on the detection signals from the respective sensors 11 to 13, and the position of the boom 4 or the like indicates the boom 4 itself or the workbench 6, It is determined whether or not the position is such that the cabin 7 is approached by a predetermined interference allowable distance (a distance sufficient for preventing interference) or the like, and a storage operation calculator is also provided.
Similar to 14, it is determined whether the boom 4 is in the fully retracted state and whether the position of the boom 4 is within the storage preparation range H.

It is determined that the boom 4 is longer than the fully retracted state or located outside the storage preparation range H, and the boom 4 and the workbench 6 are
When it is determined that the position and the length are closer to the cabin 7 by the interference allowable distance or more, the operation signal is sent to the regulation controller 17.

When the storage controller 16 and the restriction controller 17 receive the operation signals from the storage operation calculator 14 and the interference prevention calculator 15, respectively, the storage controller 16 and the restriction controller 17 send out a storage control signal and a restriction control signal to the valve unit 21. In addition, the valve unit 21 normally includes a hoisting cylinder 5, a telescopic cylinder 23, and a swing motor 24 (hereinafter, referred to as an actuator) that causes the working oil from the hydraulic pressure source 22 to perform each operation of the boom 4 in accordance with the operation of the operator. The supply / discharge of the working oil to / from each actuator is performed based on these signals regardless of the operator's operation by the storage control signal or the regulation control signal.

Next, the operation of the boom interference prevention device will be described.

During normal work, for example, when the boom 4 is laid up and down substantially horizontally and an attempt is made to pivot from the side of the vehicle body 2 to the front, the boom 4 or the workbench 6 (especially work carried on the workbench 6 Boom 4 is a blind spot
In some cases, the lower side or the lower part of the workbench 6 and the cabin 7 may approach the interference allowable distance described above. In such a state, that effect is judged by the interference prevention computing unit 15, and the operation of the boom 4 is restricted by the restriction controller 17 so that the boom 4 and the workbench 6 do not approach the cabin 7 any more, and the interference between them occurs. Is avoided. here,
The boom 4 can be operated according to the operation of the operator except in the interference direction, and the boom 4 can be moved to the target position while removing the cabin 7 by raising and lowering the boom 4 once.

After the work is completed, when the boom 4 is stored, first, the operator operates the boom 4 to shorten the boom 4 to the fully contracted state, and then the boom 4 is swung to operate the boom cradle 8.
And the boom 4 is lowered and raised. When the position of the boom 4 enters the storage preparation range H during the swing operation or the hoisting and lowering operation, the storage operation calculator 14 determines that fact, and thereafter, the storage controller 16 moves the boom 4 to the predetermined storage position. The position is automatically corrected toward P and is stored on the boom pedestal 8. During normal work, it is rare that the boom 4 is in the fully retracted state and is located at the upper lower position of the cabin 7. Therefore, the boom 4 is automatically stored in the storage preparation range H in this way. However, there is no problem in practical use.

The boom interference prevention device as described above may be used for an aerial work vehicle of the type shown in FIG. In this aerial work vehicle, a swivel base 33 is attached to the front part of the vehicle body and a boom 34
And the workbench 36 is a large tool box 39 mounted on the vehicle body.
It is placed on top of and stored. During normal work or when the boom is stored, if the boom 4 is lowered too much and the swing operation is performed in the vicinity of the front and rear of the vehicle body, the boom 34 and the workbench 36 may interfere with the cabin 37 and the tool box 39. Here, the boom interference prevention device becomes effective.

C. Effect of the Invention As described above, the boom interference prevention device of the present invention reliably prevents the boom and the workbench from interfering with the vehicle cabin and the tool box mounted on the vehicle body during normal work. On the other hand, the boom can be stored in a fully retracted state or the like and moved to a position near the predetermined storage position. Then, the boom is automatically stored by the device. Therefore, the switching operation from the boom interference prevention control to the retracting operation control and the boom retracting operation by the operator can be eliminated, which is effective for reducing the labor of the operator and improving the working efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view showing an aerial work vehicle equipped with a boom interference prevention device according to the present invention, FIG. 2 is a block diagram of the boom interference prevention device, and FIGS. 3A and 3B are the boom interference prevention devices. FIG. 4 is a side view showing an example of another type of the aerial work vehicle, which is a plan view and a side view showing a storage preparation range in which the boom storage operation control is performed by the prevention device. 4, 34 ... Boom, 6, 36 ... Workbench 7, 37, ... Cabin, 8 ... Boom cradle 39 ... Tool box P ... Predetermined storage position, H ... Storage preparation position

Claims (1)

(57) [Scope of utility model registration request] 1. A boom interference prevention device which is mounted on an aerial work vehicle having a boom which can be undulated, extended and swiveled on a vehicle body, and which has a work platform at the tip of the boom, wherein the hoist angle of the boom is An undulation detector for detecting the boom, an extension detector for detecting the extension amount of the boom, a swing detector for detecting the swing angle of the boom, and the extension amount of the boom based on signals from these detectors. The boom is stored in the predetermined storage position when it is determined that the boom has a predetermined length when stored and the swing position and the erected position of the boom are within a predetermined range with respect to the predetermined storage position with respect to the vehicle body. Based on signals from the storage control means to be operated and the detectors, the extension amount of the boom is equal to or greater than the predetermined length, or the swing position and the undulating position of the boom are within the predetermined range. When it is judged that the boom is outside, it is constituted by an interference prevention control means for restricting the operation of the boom in order to prevent the boom from interfering with the cabin or other bodywork on the vehicle body. Boom interference prevention device for aerial work vehicles.