JP2563300Y2 - Safety equipment for aerial work vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an aerial work vehicle having a work table which can be moved up and down.

[0002]

2. Description of the Related Art A workbench that can freely move up and down by a raising and lowering operation of a boom (elevator) is mounted on a vehicle body of an aerial work vehicle. An upper operating means is attached to the work table, and an operator who gets on the operating table can instruct the operation of the boom through the operation of the upper operating means. Control means is attached to the vehicle body, and the control means operates the boom in response to an instruction received from the upper operation means. Thereby, the worker (hereinafter, referred to as the upper worker) boarding the worktable can operate the boom through the operation of the upper operating means and move to an arbitrary height. by the way,
In such an aerial work vehicle, lower operating means for instructing the control device to control the operation of the boom is often attached to the vehicle body. If the lower operating means is provided in this way, when the upper operating means breaks down, a worker on the ground (hereinafter, referred to as a lower worker) can easily operate the lower operating means to move the work table to the ground. Can be taken down.

[0003] In addition, an emergency stop operating means for forcibly stopping the operation of the boom is attached to such a high place work vehicle in order to ensure the safety of upper workers. For example, when the operation of the boom is being controlled by the lower worker due to the failure of the upper operation means as described above,
When the upper worker is in danger due to the lower operator misoperating the lower operating means, an emergency cancel switch that allows the upper worker to cancel the operation of the lower operating means is attached to the workbench. I have.

Further, for example, while the upper worker is moving to a target high position while operating the upper operating means, he interferes with a structure or the like approaching behind him without notice.
The workbench also has an interference sensor that detects the occurrence of an interference accident by being operated by contacting a part of the body of the upper worker who is in the forward leaning posture. When the emergency cancel switch or the interference sensor, which is the emergency stop operation means, is operated, the supply of the operating power to both the upper operation means and the lower operation means is stopped, and the operations of the switches and the like are not released. As long as the operation of the boom is prohibited.

[0005]

However, there is a case where, for example, the upper worker is stuck between the workbench and a structure or the like and cannot move while operating the interference sensor. Even in such a case, if the operation of the boom cannot be controlled by the lower operation means as described above, it becomes difficult to rescue the upper worker, and there is a problem that the safety is not sufficient as a safety device.

The present invention has been made in view of such a problem, and allows a lower worker to move a work table even when emergency stop operation means attached to the work table is operated. An object of the present invention is to provide a safety device for an aerial work vehicle that can be used.

[0007]

In order to achieve the above object, a safety device according to the present invention is provided for stopping supply of operating power from a power source to an upper operating means and a lower operating means in an emergency or the like. The emergency stop operation means to be operated is attached to the workbench and the vehicle body, respectively.
The vehicle body is provided with a lower operation recovery means that is operated to recover only the supply of the operating power from the power supply to the lower operation means when the upper emergency stop operation means is operated.

[0008]

With such a safety device, the upper operating means and the lower operating means can be operated regardless of whether the upper emergency stop operating means (emergency cancel switch or interference sensor) is operated or the lower emergency stop operating means is operated. Power supply to both of the operation means is stopped. That is, no matter which emergency stop operating means is operated, both the upper and lower operating means become inoperable, and only when the power supply stoppage by these emergency stop operating means is released is the operation by both operating means operated Control becomes possible. However, only when the upper emergency stop operation means is operated and the power supply to the upper and lower operation means is stopped, the lower operation recovery means can be operated to supply power only to the lower operation means. And
In this case, even if the upper operation means is operated, the operation control remains impossible, but only the operation control by operating the lower operation means becomes possible. For this reason, even when the worker on the workbench (upper worker) cannot move while operating the emergency stop operating means, the worker on the vehicle body (lower worker) operates the lower operating means. , Can rescue upper workers.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an aerial work vehicle 10 provided with the safety device according to the present invention. The aerial work vehicle 10 is configured on the basis of a wheel-type traveling body 11, and a turntable 12 capable of horizontal turning is attached to an upper portion of the wheel-type traveling body 11. Further, a boom (elevating / lowering device) 13 configured to be telescopically extendable and retractable is attached to the upper part of the swivel table 12 so as to be able to move up and down. Installed.

A control device 15 for controlling the running operation of the traveling body 11, the turning operation of the swivel base 12, and the raising / lowering / extending / retracting operation of the boom 13 is mounted on a side surface of the swivel base 12. In addition, on the upper part of the work table 14 on the side of attachment to the boom 13, a work boarded on the work table 14 is provided for giving an operation instruction of the boom 13 or the like to the control device 15 (transmitting an instruction signal which is an electric signal). An upper operation device 16 operated by a worker (hereinafter, referred to as an upper worker) M is attached. In addition, above the control device 15 on the side surface of the swivel table 12, an operator (not shown: hereafter, on the ground) on the ground to give an operation instruction of the boom 13 or the like to the control device 15 instead of the upper worker M. A lower operating device 17 operated by a lower operator is mounted.

By using the aerial work vehicle 10 configured as described above, the upper worker M controls the operation of the boom 13 through the operation of the upper operating device 16 to move to an arbitrary height,
Construction work of the structure S can be performed. Workbench 14
If the upper operating device 16 breaks down while the device is located at a high place, the workbench 14 and the upper operator M can be lowered to the ground through the operation of the lower operating device 17 by the lower operator.

The upper operating device 16 and the lower operating device 17 are supplied with operating power from a battery 18 mounted on the swivel table 12. A first battery for transmitting the operating power is supplied to the upper operating device 16 and the lower operating device 17. As shown in FIGS. 2 and 3, the line 18a passes from the battery 18 to the inside of the boom 13, passes through a power breaker 22b attached to the workbench 14, and an operation cancel switch 21 (these will be described later). It is connected to a device 16. Then, as shown in FIG. 3, the second battery line 18 branched on the downstream side of the power supply breaker 22b and the operation cancel switch 21 in the first battery line 18a.
b again passes through the inside of the boom 13 and the lower operating device 17
Is connected to

By the way, as described above, the safety device 20 according to the present invention is mounted on the work vehicle 10, and as a part thereof, as shown in FIG. Means are provided. One is an operation cancel switch 21 attached to the case of the upper operation device 16. This operation cancel switch 21
For example, in the case where the upper operating device 16 has failed as described above, when the lower operator operates the lower operating device 17 erroneously, the erroneous operation is canceled by the upper operator M, and This is intended to prevent movement in the wrong direction. Specifically, as can be seen from FIG. 3, when the operation cancel switch 21 is operated, the first battery line 18a is cut off, and as a result, the supply of the operating power to the upper operation device 16 and the lower operation device 17 is stopped. You. Therefore, the output of the instruction signal from the erroneously operated lower operation device 17 to the control device 15 is stopped. The same operation cancel switch 2
3 is also attached to the lower operation device 17, so that when the upper operator erroneously operates the upper operation device 16, the lower operator can cancel the erroneous operation.

The other is, as shown in FIG.
4 is an interference sensor 22 attached to the optical sensor 4. The interference sensor 22 includes a wire 22a and a power breaker 22b. The wire 22a is located at an intermediate position between the upper operation device 16 inside the work table 14 and the position where the upper operator M who operates the upper operation device 16 stands, and has the same height as the waist of the upper operator M. It is stretched horizontally. One end of the wire 22a is attached to a fence of the workbench 14, and the other end is drawn into the power breaker 22b.

As shown in FIG. 1, for example, an upper worker M who is operating the upper operating device 16 does not notice the existence of a structure S that is approaching behind him / her carelessly. When the upper worker M interferes, the upper worker M normally assumes a leaning posture, but the wire 22a brought forward by contacting the body (waist or hand) of the upper worker M in such a posture is connected to the power breaker 22b. Drawn from. The power breaker 22b is
When the wire 22a is pulled out, as shown in FIG. 3, the first battery line 18a is cut off, and the supply of operating power to the upper operating device 16 and the lower operating device 17 is stopped.

The safety of the upper worker is ensured by the safety device 20 having these two types of emergency stop means. For example, as shown in FIG. If it becomes impossible to move while being sandwiched between S, the upper worker cannot return the wire 22a to the original state, and cannot cancel the interference detection by the interference sensor 22. For this reason, in this state, as shown in FIG.
Cannot supply power for operation, and it is not possible to rescue an upper worker sandwiched.

Therefore, the safety device 20 is provided with an emergency return circuit 25. This emergency return circuit 25
A bypass line 25a connecting the upstream side of the operation cancel switch 21 and the power supply breaker 22b in the first battery line 18a to the second battery line 18b;
A lower operation recovery switch (lower operation recovery means) 25b operated to open and close the bypass line 25a. Then, the lower operation recovery switch 25
b is attached to the case of the lower operation device 17 as shown in FIG.

For this reason, as described above, the upper operating device 16
When the power for operation is not supplied to any of the lower operating device 17 and the lower operating device 17, the lower operator turns on the lower operation recovering switch 25b, so that the lower operating device 17 is connected to the lower operating device 17 via the bypass line 25a. B supplies power for operation directly. By operating the lower operating device 17 to which the operating power is supplied by the lower operator, the boom 13 is caused to fall and contract, for example,
The upper worker can be easily rescued from the pinched state. The operating power supplied via the bypass line 25a is supplied to the upper operating device 16 in the second battery line 18b by flowing backward through the second battery line 18b. A backflow prevention means (diode) 26 is attached so that no operation signal is output from the upper operation device 16.

[0019]

As described above, according to the safety device of the present invention, the upper-side worker emergency stop operation means is operated by the worker (upper worker) on the workbench, and the upper operation means and When the supply of the operating power to the lower operating means is stopped, if the worker on the ground (the lower worker) operates the lower operation recovering means provided on the vehicle body, the operating power of the lower operating means is reduced. Only supply can be restored. For this reason, the lower worker can control the operation of the lifting device through the operation of the lower operating device, rescue the upper worker in an emergency state, and ensure the safety measures of the aerial work vehicle Can be. As described above, the operation signal is not output from the upper operation device by the operation of the lower operation recovery unit (for example, a backflow prevention unit (diode) is provided to supply power to the upper operation unit). Therefore, even if the upper operation device is still operated by the immobile upper working vehicle, no operation signal is output from the upper operation device, which is excellent in safety.

[Brief description of the drawings]

FIG. 1 is a side view of an aerial work vehicle equipped with a safety device according to the present invention.

FIG. 2 is a perspective view of a work table provided in the aerial work vehicle.

FIG. 3 is a configuration diagram of the safety device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aerial work vehicle 13 Boom (elevation device) 14 Work table 15 Control device 16 Upper operation device 17 Lower operation device 20 Safety device 21, 22 Emergency stop means 22b Power cutoff 25 Emergency return circuit 25b Lower operation recovery switch

Claims (1)

(57) [Scope of request for utility model registration] A lift device provided on a vehicle body for moving a work table up and down with respect to the vehicle body; control means for controlling the operation of the lift device; and a control means mounted on the work table and controlled by the control means. Upper operating means operated to perform a control operation of the elevating device; lower operating means attached to the vehicle body and operated by the control means to perform a control operation of the elevating device; and A safety device for an aerial work vehicle, comprising: a power supply provided to supply operating power to the upper operation means and the lower operation means; provided on the workbench, the upper operation means and the lower part An upper emergency stop operation means for stopping supply of operating power from the power supply to the operation means, and an emergency stop operation means provided on the vehicle body for the upper operation means and the lower operation means A lower emergency stop operating means for stopping the supply of operating power from the power source, provided on the vehicle body, the lower emergency operating means being operated from the power source when the upper emergency stop operating means is operated. Lower operation recovery means for recovering only the supply of the operating power, when the lower emergency stop operation means is operated,
Operation control cannot be performed by any of the upper and lower operation means unless the power supply stop for operation by the lower emergency stop operation means is released.When the upper emergency stop operation means is operated,
By operating the lower operation recovery means, the operation control by the operation of the lower operation means becomes possible only while the operation control by the operation of the upper operation means is not possible. Safety device.