JPH0647905Y2 - Boom drive control device release device for work vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a boom drive regulation only when the boom drive regulation device regulates the boom drive device due to a system abnormality in the boom operating state detection device. The present invention relates to a release device for a boom drive restricting device of a work vehicle, which is configured to release the restriction of the boom drive device by the device.

[Conventional technology]

In today's work vehicles, such as work vehicles represented by aerial work vehicles and cranes, when the work range of the boom exceeds the rated work range to prevent falls and overloads,
The drive of each device such as boom undulation (lowering), expansion and contraction (extension), and boom turning is regulated by a signal from the boom drive regulation device, that is, automatically stopped from being driven to the dangerous side (falling side). The reality is that a boom drive restricting device is provided for this purpose.

[Problems to be solved by the device]

As shown in FIG. 2, a boom drive restricting device equipped in a conventional work vehicle such as an aerial work vehicle or a crane car has a boom operating state detecting device 10, a boom rated work range calculating device 11 and the above-mentioned device. The boom operating state detecting device 10 comprises a system abnormality judging device 12 for judging an abnormality in the system of each detector, a boom drive restricting device 13 and a boom drive 14, and the boom hoisting angle in the boom operating state detecting device 10 The detection data detected by the detector, boom extension length detector, and boom turning position detector is the boom rated work range calculator.
When it is judged that the work range deviates from the rated work range in 11, the boom drive restricting device 13 is operated to restrict the boom drive device 14, and at the same time, the system of each of the above device detectors in the boom operation state detecting device 10 is controlled. Even when the malfunction is judged to be abnormal by the system malfunction judging device 12, the boom driving restricting device 13 operates similarly and the boom driving device 14
Is usually configured to regulate.

Therefore, it can be said that it is a very effective system in terms of ensuring safety. However, the conventional boom drive regulation system with the above-mentioned configuration does not work even if an abnormality occurs in the system. Since the boom drive device 14 is regulated in the same manner as the regulation for preventing the danger due to deviation from the work range, it is possible to detect a sufficient safe boom drive by the boom operating state detection device 10. Even in such a case, when the work to the dangerous side is stopped due to a system failure during work because of the uniform regulation, the worker on the aerial work vehicle, etc. is left on the ground while being placed in the bucket. It becomes impossible to descend, and in the case of a conventional aerial work vehicle, etc., an emergency contact is made to a service person to drop the bucket to the ground, or the boom drive restricting device 13 is directly connected to the boom drive restricting device 13 described above. Attaching the release switch 13a or the like for canceling the restricted state, and release the restriction of the boom driving device 14 according to the boom driving restricting device 13 by operating the release switch 13a when as described above.

However, in order to release the restricted state of the boom drive restricting device 13 having the above-described configuration, the restricted state of the boom drive restricting device 13 is unconditionally released (the restriction is not effective at all) by simply turning ON / OFF the release switch 13a. Therefore, it is impossible to judge whether the regulation is due to deviation from the original work range or due to system abnormality. In addition to the risk of overturning the work vehicle, it is completely unprotected in case of an operator's mistaken operation or intentional release by the operator, and there is a great risk of falling or damage.

[Purpose of Invention and Means for Solving Problems]

The present invention has been made in view of the above problems, and an object of the present invention is to restrict the boom drive device by the boom drive restriction device due to a system abnormality in the boom operating state detection device. The present invention is to provide a boom drive restricting device releasing device for a work vehicle, in which the boom drive restricting device does not restrict the boom drive device. Therefore, the boom operating condition detecting device and the boom operating condition detecting device are provided. A boom rating work range computing device that computes the rated work range of the boom based on the detection signal from the boom and the rating data, a system abnormality determination device that determines a system abnormality of the boom operation state detection device, and the boom rating. A boot for restricting each drive device of the boom based on the calculation signal of the work range calculation device or the judgment signal of the system abnormality judgment device. In an aerial work vehicle equipped with a drive control device and a boom drive device that drives each drive device of the boom based on a signal from the boom drive control device, a system is determined by a determination signal of the system abnormality determination device. A configuration is provided in which a regulation release device is provided that is capable of releasing the regulation of the boom drive device by the boom drive regulation device when it is determined to be abnormal.

[Action]

Since the above configuration is adopted, even if the boom drive control device operates and the boom drive device is restricted while the boom is in the driving state, the original result of the normal detection by the boom operation state detection device is the restriction. By operating the deregulation device, it is possible to immediately determine whether the boom drive device is regulated due to deviation from the rated work range or whether the system abnormality determination device regulates the system abnormality result. If the regulation of the boom drive device is the regulation due to deviation from the original rated work range due to the boom being in a dangerous work area, the boom drive device by the boom drive regulation device may also be operated by the operator. Is not released and the regulated state continues, so the safety of the work vehicle is sufficiently secured, while the boom drive device is not regulated. If by Temu abnormality determination apparatus is restricted on the system of the boom operating state detecting device can be released at any intent worker regulations of the boom driving device,
Therefore, in the case of regulation due to an abnormality in the system of the boom operating state detection device, the boom can be driven to the target position and the operator can be safely lowered to the ground. Compared with, it can perform work in high places with high safety and efficiency.

〔Example〕

Hereinafter, an embodiment of a release device for a boom drive restricting device for a work vehicle according to the present invention will be described in detail with reference to FIG.

In the figure, reference numeral 1 is a boom operation state detection device including a boom up / down angle detector, a boom extension / contraction length detector, a boom turning position detector, an outrigger tension width detector, and a boom suspension load detector. A boom rated work range calculation device for determining the work range of the boom from the actual work state data of the boom detected by the boom work state detection device and the rated work range data stored in advance in the subsequent stage of the detection device 1. 2 is provided, and a system abnormality determination device 3 that determines a system abnormality of each detector of the boom operation state detection device 1 and a system abnormality of the boom rated work range calculation device 2 is provided.

Further, after the boom rated work range calculation device 2 and the system abnormality determination device 3, the data from the boom rated work range calculation device 2 and the system abnormality determination device 3 are received. Is normal, that is, the work range of the boom is the rated work range, and there is no system abnormality in each detector, the boom drive device 5 described later, that is, the boom hoisting cylinder / boom telescopic cylinder, turntable turning motor, etc. Is normally driven, and if the data from both the devices 2 and 3 deviates from the rated work range or data indicating that there is an abnormality in the system, the drive of the boom drive device 5 at the next stage is restricted. A boom drive restricting device 4 for (stopping) is provided.

The reference numeral 4a designates a restriction release device (actually an AND circuit and ON-ON) for releasing the restriction of the boom drive device 5 by the boom drive restriction device 4 only when the system abnormality judgment device 3 judges that the system is abnormal. The regulation release device 4a is provided between the system abnormality determination device 3 and the boom drive regulation device 4.

Hereinafter, the operation of the release device for the boom drive restricting device of the work vehicle according to the present invention will be described based on the above configuration.

That is, the release device for the boom drive restricting device for a work vehicle according to the present invention sets the boom working state detection device 1 and the rated work range of the boom based on the detection signal and the rating data from the boom working state detection device 1. A boom rated work range calculation device 2 for calculating, a system abnormality determination device 3 for determining a system abnormality of the boom operation state detection device 1, a calculation signal of the boom rated work range calculation device 2 or the system abnormality determination device A boom drive restricting device 4 that restricts each drive device of the boom based on the determination signal of No. 3, and a boom drive device 5 that drives each drive device of the boom based on the signal of the boom drive restricting device 4. In the case of a local work vehicle, when the system abnormality determination device 3 determines that the abnormality is determined between the system abnormality determination device 3 and the boom drive restriction device 4. Since the regulation release device 4a for releasing the regulation of the boom drive device 5 by the boom drive regulation device 4 is provided, even when the boom drive regulation device 4 operates and the boom drive device 5 is regulated while the boom is in the driven state. ,
Whether the regulation is regulation of the boom drive device 5 due to deviation from the original rated work range as a result of normal detection by the boom operating state detection device 3, or regulation of the result of system abnormality by the system abnormality determination device 3. Deregulator
Since it is possible to make an immediate judgment by operating 4a, when the regulation of the boom drive device 5 is a regulation due to deviation from the original rated work range due to the boom being in a dangerous work area, Even when the operator operates the restriction release device 4a, the boom drive restricting device 4 does not release the boom drive device 5 and the restriction state continues, so that the safety of the work vehicle is sufficiently secured. When the regulation of the drive device 5 is the system regulation of the boom operation state detection device 1 by the system abnormality determination device 3, the regulation of the boom drive device 5 can be released by an operator's arbitrary intention, and accordingly, the boom operation state can be released. In the case of regulation due to an abnormality on the system of the detection device 1, it is possible to drive the boom to a target position and safely lower the operator to the ground.
Compared with the conventional boom drive control device release device for work vehicles, it is extremely safe and efficient, and can perform high-altitude work.

[Effect of device]

As described in detail above, the present invention provides a boom operating state detecting device, and a boom rated working range computing device for computing a rated working range of the boom based on a detection signal from the boom operating state detecting device and rating data. , A system abnormality judging device for judging a system abnormality of the boom operation state detecting device, and each boom drive device is regulated based on a judgment signal of the boom rated work range calculating device or a judgment signal of the system abnormality judging device. Boom drive restricting device,
In an aerial work vehicle equipped with a boom drive device that drives each drive device of the boom based on a signal from the boom drive control device, according to the determination signal of the system abnormality determination device,
When the system is judged to be abnormal, the boom drive restriction device is configured to be provided with a restriction release device that can release the restriction of the boom drive device. Even if the boom drive device is regulated, whether the boom drive device is regulated due to deviation from the original rated work range as a result of normal detection by the boom operating state detection device, or system abnormality by the system abnormality determination device It is possible to determine immediately whether the regulation is the result of the above by operating the deregulation device.Therefore, the regulation of the boom drive device is restricted to the original rated work range due to the boom being in a dangerous work area. If the regulation is due to deviation, the boom drive control device may not If the regulation of the boom drive device is the system regulation of the boom operation state detection device by the system abnormality determination device, the work vehicle safety is sufficiently ensured because the regulation condition is continued without being removed. Can release the regulation of the boom drive device at the will of the operator.Therefore, in the case of regulation due to an abnormality in the system of the boom operating state detection device, the boom can be driven to the target position to keep the operator safe. It has various excellent effects such as being capable of being lowered to the ground and being extremely safe and efficient in performing work in high places as compared with the conventional release device for the boom drive restricting device of a work vehicle.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a release device of a boom drive restricting device for a work vehicle according to the present invention, and FIG. 2 is a block diagram showing an outline of a release device for a boom drive restricting device of a conventional work vehicle. 1 ... Boom operating state detection device, 2 ... Boom rated work range calculation device, 3 ... System abnormality determination device, 4 ... Boom drive restriction device, 4a ... Restriction release device, 5 ... Boom drive device.

Claims (1)

[Scope of utility model registration request] 1. A boom operation state detection device, a boom rated work range calculation device for calculating a rated work range of the boom based on a detection signal from the boom operation state detection device and rating data, and the boom operation state detection device. A system abnormality judging device for judging an abnormality in the system of the device; and a boom drive restricting device for restricting each drive device of the boom based on a calculation signal of the boom rated work range calculating device or a judgment signal of the system abnormality judging device. In an aerial work vehicle equipped with a boom drive device that drives each drive device of the boom based on a signal from the boom drive control device, it is determined that the system is abnormal by the determination signal of the system abnormality determination device. In this case, a regulation release device for releasing the regulation of the boom drive device by the boom drive regulation device is provided. Releasing device of a work vehicle of the boom drive restricting device.