JPH068462U - Safety equipment in construction machinery - Google Patents

Abstract

(57) [Abstract] [Purpose] When the operator leaves the driver's seat while the construction machine is being operated and the operator is turning on the engine and holding the control lever of the control unit in the neutral position. , Even if the operator's body accidentally touches the operating lever, the operating part should not start moving. [Configuration] A control device for mounting a switch SW that is turned on when an operator M sits on the driver's seat d and turned off when the operator M is separated from the driver's seat d, and the switch SW controls the electromagnetic control valve SV. The circuit of e is connected so that the switch SW is turned on to close the circuit and the switch SW is turned off to open the circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mounts a work device, in which a work machine such as a bucket is supported on the upper surface of a vehicle body that is driven by a travel device, on the front end side of a boom that can be swung up and down. The present invention relates to a safety device in a construction machine such as a backhoe configured by mounting a drive unit including a hydraulic device and the like, a control device that controls the operation of the traveling device and the working device by the drive unit, and an operating device for the control device.

[0002]

[Prior art]

 As shown in FIG. 1, a conventional construction machine A, such as a backhoe, usually has a turning mechanism 11 that turns on a top surface of a vehicle body 1 driven by a crawler traveling device 10 with a vertical axis of rotation. The swivel base 2 is rotatably mounted on the swivel base 2, and the boom 3 is mounted on the swivel base 2 such that the boom 3 can be raised and lowered about the support shaft 30 and the arm 4 can be bent and rotated on the tip side thereof. The work machine 5 such as a bucket is attached to the tip of the arm 4 and the work device a is supported thereby. Then, on the upper surface of the swivel base 2, a drive unit b such as an engine / hydraulic device for driving the traveling device 10 and each operation unit, a control device for controlling the operation of the drive unit b, and the control device thereof. The operating device c for operating the vehicle is mounted, and the operating device c is further mounted with a driver's seat d for the operator to sit on the vehicle body 1 to operate.

[0003]

[Problems to be solved by the device]

 The above-mentioned work by the construction machine A is performed by the operator sitting on the driver's seat d operating each operating lever 60 ... Of the operating device c to operate each working unit. However, during this work, although the traveling of the vehicle body 1 and the operation of each work unit are stopped, the operator may drop from the driver's seat d with the engine kept operating.

At this time, of course, the operation levers 60 of the operating device c are kept in the attitude position in which the electromagnetic control valves of the control device whose operation is controlled by them are set to the neutral positions. When the operator descends from the driver's seat d, the body may come into contact with the operation lever 60 and move, which causes a problem that the operating part starts to move and causes an unexpected accident.

The present invention has been made to solve this problem. During operation, the operating levers 60 of the operating device c are set to a neutral posture position while the engine is operating. Then, when the operator temporarily leaves the driver's seat d and performs manual work accompanying the work around the vehicle body 1, the operator descending from the driver's seat d accidentally moves the operation levers 60 ... However, it is an object of the present invention to provide a new means for ensuring safety by preventing the working unit from suddenly starting to operate.

[0006]

[Means for Solving the Problems]

 In the present invention, as means for achieving this object, a drive unit including a working device and an engine / hydraulic device and an electromagnetic control valve for operating each operating unit are controlled on a vehicle body traveling by a traveling device. In a construction machine equipped with a driver's seat and an operating device for operating and controlling the device and its control device, the operator is turned on when the operator sits on the driver's seat and turned off when the operator leaves the operator's seat. Construction in which a switch is attached to the circuit of the control device that controls the electromagnetic control valve so that the circuit is closed when the switch is turned on and the circuit is opened when the switch is turned off. It proposes a safety device for machinery.

[0007]

【Example】

 Next, embodiments will be described in detail with reference to the drawings. The same reference numerals are used for the constituent members having the same effects as those of the conventional ones.

FIG. 2 is a partially cutaway side view of a construction machine A embodying the present invention. In FIG. 2, 1 is a vehicle body run by a traveling device 10 including crawlers, and 2 is a turning mechanism on the upper surface of the vehicle body 1. A swivel rotatably mounted via 11, a is a boom 3 erected on the upper surface of the swivel 2 so as to oscillate around a support shaft 30, and is connected to the tip end side of the boom 3 for bending and rotation automatically. And a working machine 5 which is connected to and supported by the arm 4 so as to freely bend and rotate, and b is composed of an engine and a hydraulic system mounted on the upper surface of the swivel base 2. A drive unit, c is an operating device of a control valve device for controlling the switching operation of the hydraulic circuit of the drive unit b, and d is a driver's seat mounted on the upper surface of the swivel base 2, and these are the same as the conventional ones. In the construction machine A in this embodiment, the working device a is a backhoe using the working machine 5 as an excavation bucket, and the working machine 5 may be another working device such as a clam shell or a breaker.

SW indicates a switch mounted on a driver's seat c mounted on the upper surface of the vehicle body 1 of the construction machine A.

As shown in FIG. 3, when the operator M sits on the driver's seat d, the switch SW is pushed down by the weight of the operator M to turn on, and the operator M is separated from the driver's seat d as shown in FIG. And is operated in the off state by releasing the pressure caused by the weight. In the embodiment, the switch SW is embedded inside the seat of the driver's seat d, but the switch SW is placed in the support frame of the driver's seat d downward by the weight of the operator M on which the entire operator's seat d sits. Between the support frame and the driver's seat d, the pedestal is movably supported so that the operator M sits on the driver's seat d and turns on when the operator M moves away from the driver's seat d. You may attach it.

As shown in FIGS. 5 and 6, the switch SW is provided in the circuit of the control device e 1 which controls the electromagnetic control valve SV by operating the operation lever 60 of the operation device c 1. When the SW is turned on, the circuit is closed and the solenoid control valve SV is brought into a predetermined control operation by operating the operation lever 60, and the switch SW is turned off. Thus, the circuit is opened so that the electromagnetic control valve SV is not controlled even if the operation lever 60 is operated.

[0012]

[Effect of device]

 As described above, the safety device in the construction machine according to the present invention is turned on when the operator M sits on the driver's seat d, and the circuit of the controller e of the electromagnetic control valve SV is closed, so that the operator M from the driver's seat d is closed. Since the switch SW that turns off the switch SW to open the circuit of the control device e is attached to the driver's seat d, the engine M is kept in the operating state during work and the operator M When the operator M accidentally touches the operating lever 60 of the operating device c held in the neutral position when the operator dismounts from the vehicle body 1 and performs manual work around the operation. As a result, the working units such as the working device a, the traveling device 10, the turning mechanism 11 and the like do not suddenly start moving, and the work can be performed safely.

[Brief description of drawings]

FIG. 1 is a side view of a conventional construction machine.

FIG. 2 is a partially cutaway side view of a construction machine according to the present invention.

FIG. 3 is a partially cutaway side view of the main part of the above.

FIG. 4 is a partially cutaway side view of the above-mentioned essential part of the operator when the operator is away from the driver's seat.

FIG. 5 is an expanded view of the electric circuit of the main part of the same.

FIG. 6 is an expanded explanatory view of a state in which a switch of the electric circuit is turned off.

[Explanation of symbols]

A ... Construction machinery, M ... Operator, SW ... Switch,
SV ... Electromagnetic control valve, a ... Working device, b ... Drive unit, c ... Operating device, d ... Driving seat, e ... Control device, 1 ... Vehicle body, 10
... Traveling device, 11 ... Revolving mechanism, 2 ... Revolving base, 3 ... Boom, 30 ... Spindle, 4 ... Arm, 5 ... Working machine, 60 ... Operation lever.

Claims (1)

[Scope of utility model registration request] 1. A control device e is provided on a vehicle body 1 traveling by a traveling device 10 and includes a working device a, a drive part b including an engine and a hydraulic device, and an electromagnetic control valve SV for operating each operating part.
In a construction machine in which an operating device c for operating and controlling the control device e and a driver's seat d are mounted,
A switch SW is attached which is turned on when the operator M sits on the driver's seat d and is turned off when the operator M is separated from the driver's seat d. The switch SW is a circuit of a controller e for controlling the electromagnetic control valve SV. A safety device for a construction machine, wherein the switch SW is turned on to close the circuit and the switch SW is turned off to open the circuit.