JPH05272155A - Working-machine interference preventing device - Google Patents

Abstract

(57) [Summary] [Purpose] The interference prevention area of the work equipment interference prevention device has been optimized. [Structure] Work implement 2 offset to the front side of the cab 1
When the vehicle is bent toward the operator's cab, the interference preventing area 3 around the operator's cab 1 where the working machine 2 interferes is stored in the controller so that the working machine 2 automatically stops in the area 3. In the work machine interference prevention device, an emergency stop area 4 is provided in the interference prevention area 3 on the side of the operator's cab 1, and the emergency stop area 4 is covered by the interference prevention area 4 provided on the lower side of the operator's cab 1. The corner interference prevention area 5 where the front part and the side part around the cab 1 intersect is cut into a chamfer. [Effect] Even if the bucket blade edge enters the emergency stop area from the lower side of the operator's cab, the interference prevention area provided on the lower side causes normal automatic stop. Further, since the corner portion in the interference prevention area is cut to eliminate the automatic stop of this portion, the work efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine interference which prevents an accident such that the work machine interferes with the driver's cab and damages the operator's cab when working on a vehicle for excavation and loading such as a power shovel. Regarding prevention device.

[0002]

2. Description of the Related Art In a vehicle for excavation and loading such as a power shovel, a driver's cab is generally provided on the left side above an upper swing structure.
A working machine including a boom, an arm, and a bucket is provided on the right side. At the time of work, the boom undulates with respect to the upper revolving structure, and the arm provided at the tip of the boom and the bucket at the tip of the boom rotate in the front-rear direction. It does not interfere with the cab on the upper part of the body. However, when the side of the vehicle is to be dug, it cannot be dug with the working machine described above, and therefore the conventional boom is divided into upper and lower parts as shown in the side view of FIG. 3A and the plan view of FIG. 3B. The upper boom 42 to the lower
There is one that can be offset in the left-right direction with respect to the frame 41. In the vehicle for excavation and loading having such a mechanism, when the upper boom 42 is offset to the driver's cab 43 side, that is, the left side, the working range of the arm 44 and the bucket 45 may interfere with the driver's cab 43. .. On the other hand, an interference prevention area is provided around the operator's cab 43, and all of this area is stored in the controller. When the working machine enters this area, the working machine operates according to a command from the controller. A work implement interference prevention device designed to stop the work is considered.

[0003]

However, in the conventional work machine interference prevention device, an emergency stop region where all operations are disabled is provided inside the interference prevention region as a countermeasure when the interference prevention device does not operate due to a defect. Therefore, even when the working machine moves to the lower side of the operator's cab, it enters the emergency stop area and the operation of the working machine stops, resulting in poor workability. Further, since the interference prevention area is provided at the predetermined width on the front and side surfaces of the operator's cab, the corner portion becomes a corner, and when stopped at the corner portion, the distance from the operator's cab is too long. for,
There is a drawback that the interference prevention area becomes too wide than necessary.

In view of this, the present invention has been made in order to solve the drawbacks of the prior art by providing a working machine interference prevention device capable of optimizing an interference prevention area.

[0005]

SUMMARY OF THE INVENTION As a means for solving the above-mentioned problems of the prior art, the present invention is directed to a case where a working machine offset toward the front side of the operator's cab is bent toward the operator's cab. In a work machine interference prevention device in which a controller stores an interference prevention area around a driver's cab to cause the work machine to automatically stop within the area, an emergency stop area is provided on the operator's cab side in the interference prevention area. This emergency stop area is covered by the interference prevention area provided on the lower side of the operator's cab, and the corner interference prevention area where the front and side portions around the operator's cab intersect is cut into a chamfer. It is characterized by

[0006]

According to the above construction, since the emergency stop area is covered by the interference prevention area provided under the driver's cab, the work implement moved to the lower side of the operator's cab does not undergo an emergency stop and is covered. It becomes possible to automatically stop in the interference prevention area that has been cut, and since the corner interference prevention area is cut into a chamfer, there is no more interference prevention area than necessary.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an embodiment of a work implement interference prevention device according to the present invention, FIG. 2 shows an embodiment showing the essential parts of the present invention, (a) is a side view, and (b) is a side view. ) Is A-A of (a)
FIG.

The present invention will be described below with reference to the embodiments shown in FIGS. According to the present invention, when the working machine 2 offset to the front side of the operator's cab 1 is bent toward the operator's cab, the controller can store the interference prevention region 3 around the operator's cab 1 which causes interference. , The working machine 2 is in the area 3
In a work implement interference prevention device that automatically stops in a room, an emergency stop area 4 is provided on the operator cab 1 side in the interference prevention area 3.
This emergency stop area 4 is covered by an interference prevention area 3 provided below the operator's cab 1, and a corner interference prevention area 5 where the front and side portions around the operator's cab 1 intersect. It is made up of chamfered cuts.

FIG. 1 shows a hydraulic circuit of an excavation and loading vehicle in which a working machine 2 offset to the front of the operator's cab 1 can be bent toward the operator's cab 1. The hydraulic pressure is applied to a desired actuator (not shown). Supply direction switching valves 61, 62, 63,
The pilot pressure control valves 81, 82, and 83 are switched by the hydraulic pressure from the pilot pump 7. Among them, in the middle of the circuit 9 from the boom control valve 81 raising side to the boom direction switching valve 61 raising side, a boom raising stop electromagnetic proportional valve 10 and an arm control valve 82 from the excavating side are provided. −
A solenoid valve for stopping arm excavation 12 is connected in the middle of the circuit 11 extending to the excavation side of the solenoid valve 6, and the solenoid proportional valves 10 and 12 are connected to a controller 13. The boom control valve 81 is operated by the right operation lever 14, the arm control valve 82 is operated by the left operation lever 15, the offset control valve 83 is operated by the operation pedal 16, and the offset direction switching valve. A solenoid valve 35 is connected to the circuit 19 extending to the left side of the solenoid valve 63.
Reference numeral 5 is connected to the controller 13. These control valves 81, 82, and 83 are pilot circuits 9, 11, 17, 18, 19, 2 at the left and right ends of the boom direction switching valve 61, the arm direction switching valve 62, and the offset direction switching valve 63, respectively.
Connected by 0. Furthermore, each of the directional control valves 61
, 62 are supplied from the main pumps 21 and 22, and the directional control valve 63 is supplied from the main pump 23 through the main circuits 24, 25 and 26, respectively. The controller 13 is provided at the fulcrum of the offset boom 29, the potentiometer signal 27a provided at the fulcrum of the boom 27, the potentiometer signal 28a provided at the fulcrum of the arm 28 when the working machine 2 is operated. Input the potentiometer signal 29a
When the vehicle approaches the preset interference prevention area a for the driver's cab 1, an output signal for avoiding this is issued. The proportional solenoid valves 10 and 12 are the controller 1
When the output signal from 3 is received, it operates in proportion to the magnitude of the current, which reduces the stop shock to prevent the bucket from spilling and reduces the variation in the stop position. The throttle amount can be adjusted according to the speed, and when the speed is fast, the throttle is enlarged to reduce the flowing area. Further, the solenoid valve 35 operates to open and close when receiving the output signal from the controller 13.
Since the speed at which the offset boom 29 is offset is not fast, it is not necessary to use a proportional solenoid valve. Further, a hydraulic lock solenoid valve 31 is provided in the circuit 30 between the control valves 81, 82 and 83 and the pilot pump 7.
This valve 31 shuts off the circuit 30 when receiving the output signal from the controller 13. 3 in the figure
2 is a bucket.

Next, the operation will be described. Right operation lever-14
The left operation lever 15 is used to raise the boom control valve 81, the arm operation valve 82 is operated to the excavation side, and the operation pedal 16 for offsetting is further operated to operate the working machine 2 to operate. When the blade edge of the bucket 32 approaches the area 3 for preventing interference with the cab 1, the controller 13 detects this and outputs a signal to one or both of the solenoid proportional valves 10 and 12. Now, assuming that both receive signals, the solenoid proportional valves 10 and 12 operate so as to throttle the flow rates of the circuits 9 and 11 of the respective directional control valves 61 and 62. As a result, the working speed becomes slower, and it is possible to slowly stop in the interference area 3. However, the electromagnetic proportional valves 10 and 12 may enter the interference prevention area 3 due to a defect or the like. In order to prevent such a situation, in the present invention, an emergency stop area 4 is provided in the interference area 3 close to the operator's cab 1, and when it enters the area 4, the hydraulic lock solenoid valve 31 operates to operate the work machine. 2 will be stopped urgently. However, when such an emergency stop area 4 is provided, the blade edge of the bucket 32 approaches the lower side of the operator's cab 1 due to work, and when approaching the emergency stop area 4, the hydraulic lock solenoid valve 31 is actuated and the hydraulic lock solenoid valve 31 is activated. The operation stops. In order to prevent this, the interference prevention area 3 is extended to the lower side of the operator's cab 1 and the electromagnetic proportional valve 1 is provided.
It is automatically stopped by 0 and 12. Further, when the interference prevention region around the driver's cab 1 is provided in the front and side, the corner interference prevention region 5 becomes a corner, and this portion is in the driver's cab 1
Despite the fact that the working machine 2 approaches even though the working machine 2 is far from the work machine 2, the work efficiency is lowered. Therefore, by cutting the corner interference prevention region 5, the blade edge of the bucket 32 during work can approach the chamfered portion and pass in parallel therewith.

[0011]

As described above, according to the present invention, when the working machine offset to the front side of the operator's cab is bent toward the operator's cab, the interference preventing area around the operator's cab that causes the working machine to interfere is controlled. -In a work implement interference prevention device that is stored in LA and the work implement automatically stops in the region, an emergency stop region is provided near the driver's cab in the interference prevention region, and the emergency stop region is set in the driver's cab. In addition to covering in the interference prevention area provided on the lower side of the driver's cab and cutting the corner interference prevention area around the front and side of the cab around the chamfered edge, the bucket blade edge from the lower side of the cab Even if you enter the emergency stop area, the interference prevention area on the lower side does not stop the emergency, but it becomes a normal automatic stop. The corner of And it eliminates the automatic stop at this moiety, work efficiency can be improved work so can continue.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a circuit of a work implement interference prevention device according to the present invention.

2A and 2B show an embodiment showing a main part of the present invention, FIG. 2A is a side view, and FIG. 2B is an explanatory view showing a cross section taken along the line AA of FIG.

FIG. 3 shows a conventional offset excavation and loading vehicle, (a)
Is a side view and (b) is a plan view.

[Explanation of symbols]

 1 Operator's cab 2 Work machine 3 Interference prevention area 4 Emergency stop area 5 Corner interference prevention area 13 Controller

Claims (1)

[Claims] 1. A work machine, in which an interference prevention area around the cab where the work machine causes interference when the work machine offset to the front side of the cab is bent toward the cab, is stored in a controller. In the work equipment interference prevention device configured to automatically stop in the area, an emergency stop area is provided near the operator's cab in the interference prevention area, and the emergency stop area is provided below the operator's cab. The work machine interference prevention device is characterized in that a corner interference prevention region where a front portion and a side portion around a driver's cab intersect is cut into a chamfered shape.