JP2002114500A - High lift work device or safety device for high lift work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high lift work vehicle solved in a problem of a safety device for a conventional high lift work vehicle that an operator 17 is kept pinched in the conventional high lift work vehicle having a pinch press detection means 21 which is provided inside a bucket 6, which detects the pressing of the operator 17 to a part of the bucket 6, which restrains operation of the high lift work vehicle when the detection means 21 executes detection operation, and which reduces a degree of the pinch press as compared to a vehicle without the safety device when the operator 17 is pinched. SOLUTION: This safety device has an actuator detection means 31 detecting an actuator in operation now and its operating direction, and a control means 32 controlling the driving for the actuator. When the pinch press detection means 21 executed the detection operation, the safety device reversely operates the actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work apparatus or a safety device for an aerial work vehicle, which prevents an operator from being seriously injured when pressed against a part of a work table.

[0002]

2. Description of the Related Art As shown in FIG. 5, an aerial work vehicle includes a base frame 2 and a base frame 2 mounted on a movable vehicle 1.
The swivel 3 is pivotally mounted on the swivel base, the telescopic boom 4 has a base end mounted on the upper end of the swivel 3 so as to be undulated, and is mounted on the distal end of the telescopic boom 4 to maintain the posture irrespective of the up / down drive. A work table 6 is attached to the holding member 5 and the posture holding member 5 so as to swing freely. These can be freely moved by a traveling actuator 7 and a turning actuator 8
The actuator is driven so as to be swivelable, up and down by an up-and-down actuator 9, freely expandable and contractible by a telescopic actuator 10 (not shown), freely to maintain a posture by a posture maintaining actuator 11, and swingable by a oscillating actuator 12 (not shown). .

The work table 6 is provided with an upper operation device 15, and an operation lever 16 and switches of the upper operation device 15 are operated by an operator 17 mounted on the work table 6, whereby each of the actuators 7 to 12 is activated. By operating the operation lever 16 and switches of the upper operation device 15 appropriately, the work table 6 is brought close to the work object 18 to perform work at a high place.

[0004] Among such aerial work vehicles, there is a safety device provided with clamping pressure detecting means 21 for detecting that an operator 17 is pressed against a part of the work table 6 as a safety device. Yes, for example, as disclosed in Japanese Utility Model Publication No. 7-21513.

[0005] This known safety device for an aerial work vehicle includes traveling of an aerial work vehicle (driving by a travel actuator 7) or operation of an aerial work device (a turning actuator 8, an up-and-down actuator 9, or a telescopic actuator 1).
0, or driving by the posture maintaining actuator 11 or the swinging actuator 12), as shown in FIG. 6, the operator 17 is pushed by the work 18 and pressed against a part of the worktable 6. When the detecting means 21 detects, the traveling of the aerial work vehicle or the operation of the aerial work device is regulated.

[0006] Therefore, as compared with a device without such a safety device, the degree of pinching pressure when pinched can be reduced, and there is an effect that a fatal injury can be prevented.

[0007]

A conventional work apparatus for aerial work or a safety device for an aerial work vehicle, when the clamping pressure detecting means 21 detects and operates, the traveling of the aerial work machine or the operation of the aerial work apparatus. regulate. The workbench 6 stops at the position detected by the clamping pressure detecting means 21 or at the position moved by inertia to the side to be clamped from the detected position, and the operator 17 is still clamped (the state of FIG. 6). There was a problem.

[0008] Even if the operator 17 is caught, it is sufficient that the operator 17 immediately performs the reversing operation and is released from the state of being caught. is there. In addition, if the head is hit by the work target and the consciousness is lost due to poor conditions, a long time elapses while being sandwiched, and the degree of injury may increase.

The present invention is directed to an aerial work apparatus or an aerial work vehicle safety device that solves the above-mentioned problems of the prior art, that is, the pinch pressure detecting means 21 detects and operates the aerial work vehicle.
Alternatively, an object of the present invention is to provide a safety device for an aerial work apparatus or an aerial work vehicle, which immediately releases an operator 17 who has been pinched by being restricted in operation of the aerial work apparatus, from the squeezed state. is there.

[0010]

Means for Solving the Problems To solve the above-mentioned problems, a safety device for an aerial work apparatus or an aerial work vehicle according to the present invention is configured as follows.

According to the first aspect of the present invention, the lifting mechanism is pressed against the vehicle or the mounting base, the work table is provided at the tip of the lifting mechanism, the upper operating device is pressed against the work table, and the operator is pressed against a part of the work table. Pressure detection means for detecting
An actuator detecting means for detecting the currently operating actuator and its operating direction, and a control means for controlling the driving of the actuator are provided, and the control means relates to the detection of the actuator detecting means when the clamping pressure detecting means detects and operates. In addition to selecting an actuator, an inversion direction is selected with respect to an operation direction relating to detection, and the selected actuator is controlled to perform an inversion operation.

When the clamping pressure detecting means detects that the operator has been pushed by the work object and pressed against a part of the work table,
The control means for controlling the driving of the actuator selects the actuator currently in operation and the actuator related to the detection by the actuator detecting means for detecting the operation direction of the actuator, and selects the reverse direction with respect to the operation direction related to the detection. Then, the selected actuator is inverted.

[0013] By this reversing operation, the squeezed operator is immediately released from the squeezed state. After being released, the operator may appropriately select whether to continue the operation as it is, to temporarily stop the operation, or to treat the abrasion, and perform the next operation.

According to a second aspect of the present invention, the control means according to the first aspect selects the actuator related to the detection by the actuator detecting means when the clamping pressure detecting means performs the detecting operation, and sets the reverse direction to the operating direction related to the detection. A configuration is adopted in which a selected actuator is controlled to stop after performing a predetermined amount of inversion operation.

When the clamping pressure detecting means detects, the control means:
Selecting the actuator related to the detection by the actuator detection means, selecting the reverse direction with respect to the operation direction related to the detection, and performing the reverse operation is the same as in claim 1, but after a predetermined amount of the reverse operation, stops. You do it.

By the predetermined amount of the reversing operation, the squeezed operator is immediately released from the squeezed state. After being released, the aerial work equipment or aerial work vehicle stops. Therefore, the operator may appropriately select whether to continue the work or to treat the abrasion, and perform the next operation.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIGS. 1, 2, 5, and 6. FIG. Reference numerals 1 to 12, 15 to 18, and 21 have the same meanings as those described and used in the related art, and thus description thereof is omitted here.

As shown in FIG. 5, the aerial work vehicle has a base frame 2 mounted on a vehicle 1 which can travel freely, a turntable 3 mounted on the base frame 2 so as to be freely rotatable, and a base end portion of the swivel base 3. An extendable telescopic boom 4 attached to the upper end so as to be able to move up and down, a posture maintaining member 5 attached to the end of the telescopic boom 4 to maintain a posture irrespective of the up / down driving, and a worktable 6 attached to the posture maintaining member 5 so as to swing freely. , Which can be run freely by the travel actuator 7, can be freely turned by the swing actuator 8, can be freely raised and lowered by the up and down actuator 9, can be freely expanded and contracted by the extendable actuator 10 (not shown), can be freely maintained by the posture maintaining actuator 11, and can swing. Actuator
12 (not shown) to be able to swing freely,
It is the same as the prior art.

The worktable 6 is provided with an upper operation device 15. When an operator 17 on the worktable 6 operates an operation lever 16, switches, and the like of the upper operation device 15, each of the actuators described above is operated. It is the same as the prior art that 7 to 12 are operated and that the inside of the work table 6 is provided with a clamping pressure detecting means 21 for detecting that the operator 17 is pressed against a part of the work table 6. .

Incidentally, reference numeral 31 denotes actuator detecting means, and 32 denotes control means. Actuator detection means
Reference numeral 31 includes a detection portion 31a for detecting which actuator is currently in operation, and a detection portion 31b for detecting the direction of operation of the currently operated actuator. Further, the control means 32
When the clamping pressure detecting means 21 performs the detecting operation, the actuator related to the detection of the detecting portion 31a of the actuator detecting means 31 is selected, and the reverse direction is selected with respect to the operating direction related to the detecting of the detecting portion 31b. Is controlled to perform a reversing operation.

The first embodiment of the safety device for an aerial work vehicle thus constructed according to the present invention operates as follows.

First, in the case of a normal operation in which the clamping pressure detecting means 21 does not perform the detecting operation, an operator 17 on the work table 6 operates the operating lever 16 of the upper operating device 15, a switch, etc. 12 are operated, the operation lever 16 and the switch of the upper operation device 15 may be appropriately operated to bring the work table 6 close to the work object 18 and perform work at a high place. A loop is drawn by following the routine of step 1, NO in FIG.

Next, the case where the clamping pressure detecting means 21 performs the detecting operation will be described. The operator attempts to work at a high place by bringing the work table 6 close to the work object 18, and accidentally getting too close to the work object 18, and the operator 17 is pinched between a part of the work table 6 and the work object 18. Suppose that Then operator 17
Is pressed against a part of the worktable 6 to detect the pressing force.
Is detected. This is the routine of YES in step 1 of FIG.

When the squeezing pressure detecting means 21 performs the detecting operation, the control means 32 determines the output signal of the actuator detecting means 31 from the output signal.
Which actuator is used when the detection operation is performed (step 2 in FIG. 2), and which direction is the operation direction of the actuator when the detection operation is performed (FIG. 2)
Step 4) is recognized. In these, the actuator detecting means 31 always detects which actuator is currently operating by the detecting portion 31a, and in which direction the operating direction of the currently operating actuator is detected by the detecting portion 31b. Because it is always detected whether there is, it can be easily recognized.

Subsequently, the control means 32 selects an actuator involved in the detection of the detection portion 31a of the actuator detection means 31 (step 3 in FIG. 2), and the detection portion 31
A reverse direction is selected for the operation direction related to the detection of b (step 5 in FIG. 2). The actuator selected here is single if there is only one actuator involved in the detection of the detection portion 31a, and plural if there is more than one.

Then, the control means 32 inverts the selected actuator in the selected inversion direction (Step 6 in FIG. 2).

With this control, the operator 17 that has been squeezed is immediately released from the squeezed state. Therefore, even if the operator 17 is squeezed, the operator 17 does not elapse for a long time while being squeezed.

After the release, the operator may appropriately select whether to continue the work, to temporarily stop the work, or to treat the abrasion, etc., and to perform the next operation. The inversion operation may be released by providing a dedicated switch, or by detecting that the operation lever 16 has been operated neutral after the inversion operation has started.

Next, a second embodiment of the present invention will be described with reference to FIGS. 1, 3, 5, and 6. FIG. Reference numerals 1 to 12, 15 to 18, and 21 are the same as those described and used in the related art, and reference numeral 31 is the same as that described and used in the first embodiment. Here, the description of the reference numerals is omitted and used.

Reference numeral 33 denotes control means.
When the clamping pressure detecting means 21 performs the detecting operation, the actuator related to the detection of the detecting portion 31a of the actuator detecting means 31 is selected, and the reverse direction is selected with respect to the operating direction related to the detecting of the detecting portion 31b. The actuator is controlled to stop after performing a predetermined amount of inversion operation.

The second embodiment of the safety device for an aerial work vehicle thus constructed according to the present invention operates as follows.

First, in the case of a normal operation in which the pinching pressure detecting means 21 is not detecting, the operator 17 on the work table 6 operates the operating lever 16 of the upper operating device 15, a switch, etc. 12 are operated, the operation lever 16 and the switch of the upper operation device 15 may be appropriately operated to bring the work table 6 close to the work object 18 and perform work at a high place. A loop is drawn by following the routine of step 11, NO in FIG.

Next, the case where the clamping pressure detecting means 21 performs the detecting operation will be described. The operator attempts to work at a high place by bringing the work table 6 close to the work object 18, and accidentally getting too close to the work object 18, and the operator 17 is pinched between a part of the work table 6 and the work object 18. Suppose that Then operator 17
Is pressed against a part of the worktable 6 to detect the pressing force.
Is detected. This is the routine of step 11, YES in FIG.

When the pinching pressure detecting means 21 performs the detecting operation, the control means 33 calculates the output signal of the actuator detecting means 31
Which actuator is used when the detection operation is performed (Step 12 in FIG. 3), and which direction is the operation direction of the actuator when the detection operation is performed (FIG. 3)
Step 14) is recognized. In these, the actuator detecting means 31 always detects which actuator is currently operating by the detecting portion 31a, and in which direction the operating direction of the currently operating actuator is detected by the detecting portion 31b. Because it is always detected whether there is, it can be easily recognized.

Subsequently, the control means 33 selects an actuator involved in the detection of the detection part 31a of the actuator detection means 31 (step 13 in FIG. 3), and the detection part 31
A reverse direction is selected for the operation direction related to the detection of b (step 15 in FIG. 3). The actuator selected here is single if there is only one actuator involved in the detection of the detection portion 31a, and plural if there is more than one.

Then, the control means 33 inverts the selected actuator in the selected inversion direction (step 16 in FIG. 3). The reversing operation is continued until the reversing operation reaches a predetermined amount (step 17 in FIG. 3, the NO routine is drawn and a loop is drawn). When the reversing operation reaches a predetermined amount (step 17 in FIG. 3, YES routine), control is performed to stop the reversing operation (step 18 in FIG. 3).

Because of this control, the squeezed operator 17 is immediately released from the squeezed state. Therefore, even if the operator 17 is squeezed, the operator 17 does not elapse for a long time while being squeezed.

After the vehicle is released, the aerial work vehicle is stopped, and the operator selects the continuation of the work, the treatment of abrasion, and the like as appropriate to perform the next operation. Good.

The predetermined amount in the reversing operation is a predetermined amount of time, a predetermined distance between the work table 6 and each of the actuators 7 to 12, and no more than the predetermined amount until the position where the pressure detection means 21 stops detecting. The position may be from a position at which the pressure detecting means 21 stops detecting operation to a position after a predetermined time or a predetermined distance. These predetermined amounts may be different for each actuator depending on the characteristics of the actuator, or may be such that the operation speed is detected and the predetermined amount is calculated.

Further, in FIG. 1, the actuator detecting means 31 is shown to detect from the actual operation of each of the actuators 7 to 12, but it may be as shown in FIG. 4 as an embodiment. That is, it detects which actuator is operated in which direction from the operation signal sent from the upper operation device 15 to the control means 32, 33.

The actuator detecting means 31 includes a control means 32
Or integrated with 33, and the control means
32 or 33 may be integrated with a conventionally provided controller that receives an operation signal of an operation device and outputs a drive signal to each actuator.

In FIGS. 1 and 4 described above, signals are directly input from the control means 32 or 33 to the actuators 7 to 12, and the actuators 7 to 12 appear to be electric actuators. Other actuators may be used. In the case of a hydraulic actuator, each of the actuators 7 to 12 is paired with a solenoid valve, and a control signal is output from the control means 32 or 33 to the solenoid valve. It is supplied to actuators 7-12.

Further, in the above description, the safety device for an aerial work vehicle has been described. However, it is needless to say that the present invention may be applied to a stationary aerial work device. , Is useless.

Although the posture maintaining actuator 11 is not shown in FIGS. 1 and 4, this is because the normal posture maintaining actuator 11 operates in conjunction with the ups and downs. If it is configured to be operated manually, it may naturally be included.

Further, the high work apparatus or the high work vehicle is not limited to the boom type of straight extension or bending and extension, but can be applied to various forms such as a scissors type and a vertical post type.

If it is not desired to perform the reversing operation, a selection switch for preventing the reversing operation may be provided, or a specific actuator, for example, only the oscillating actuator 12, may be provided with a reversing operation function from the beginning. .

[0047]

According to the present invention, an aerial work apparatus or an aerial work vehicle is provided with a clamping pressure detecting means for detecting that an operator is pressed against a part of the work table, and an actuator which is currently operating. And an actuator detecting means for detecting the operating direction thereof, and a control means for controlling the driving of the actuator, wherein the controlling means selects an actuator involved in the detection of the actuator detecting means when the clamping pressure detecting means operates. In addition, a reverse direction is selected with respect to the operation direction related to the detection, and the selected actuator is controlled to perform a predetermined amount of reverse operation and then stop.

With this configuration, the operator who has been squeezed is immediately released from the squeezed state. Therefore, even if the operator is squeezed, the operator does not elapse for a long time while being squeezed.

As described above, the aerial work apparatus or the aerial work vehicle safety device of the present invention provides
It has a great effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a safety device for an aerial work vehicle according to the present invention.

FIG. 2 is a flowchart showing the operation of the safety device for an aerial work vehicle according to the present invention.

FIG. 3 is a flowchart showing the operation of another embodiment of the safety device for an aerial work vehicle according to the present invention.

FIG. 4 is a block diagram showing another example of the safety device for aerial work vehicles according to the present invention.

FIG. 5 is an explanatory diagram showing a configuration of an aerial work vehicle.

FIG. 6 is an explanatory diagram showing a pinching state.

[Explanation of symbols]

 1 vehicle, 2 base frame, 4 telescopic boom, 6 workbench, 15 upper operation device, 21 clamping pressure detection means, 31 actuator detection means, 32, 33 control means,

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F333 AA08 AB01 BB21 FA13 FD02 FD20

Claims (2)

[Claims] 1. An elevating mechanism on a vehicle or a mounting base,
A workbench at the tip of the elevating mechanism, an upper operating device on the workbench,
And a clamping device for detecting that an operator has been pressed against a part of the work table. Actuator detection means for detecting the operation direction, and control means for controlling the drive of the actuator are provided. When the clamping pressure detection means detects and operates, the control means selects an actuator related to the detection by the actuator detection means and performs detection. And a control device for controlling the selected actuator to perform a reversing operation. 2. The control means selects an actuator related to detection by the actuator detection means when the clamping pressure detection means performs a detection operation, and selects an inversion direction with respect to an operation direction related to the detection. 2. The safety device for an aerial work device or an aerial work vehicle according to claim 1, wherein the device is controlled to stop after a predetermined amount of reversing operation.