JPS63165353U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a side view of a wheeled tractor shovel, which is an example of a wheeled construction machine to which this invention is applied; Figure 2 is an electric/hydraulic circuit diagram of the main parts of the wheeled tractor shovel shown in Figure 1; Figure 3 is a perspective view of an embodiment showing how to install a limit switch according to this invention;
FIG. 4 is a side view of the wheeled tractor shovel while traveling on a rough road, and FIG. 5 is an electrical circuit diagram of a main part showing a second embodiment of this invention. 3... Working device, 8... Lift cylinder, 13
... Hydraulic switching valve for lift cylinder, 17 ... Solenoid switching valve, 18 ... Slow return valve, 19 ... Accumulator, 20 ... Vibration suppression circuit, 29,3
0...Limit switch, 35...Relay, 42
...Switching switch.

Claims (1)

[Scope of utility model registration request] One end of the working device is attached to the vehicle body in an articulated manner,
In wheel-type construction machinery, in which hydraulic cylinders support the weight and working load of working equipment, or perform predetermined rotational movements, the pipe line that communicates with the hydraulic cylinder circuit on the side where pressure is generated due to the load from the working equipment. An accumulator is connected to the branch pipe through an electromagnetic switching valve that normally opens the internal oil passage by the biasing force of a spring and closes by an electric signal from the outside, and connects the electromagnetic switching valve and the accumulator. A slow return valve is disposed in the middle of the conduit, and only when the working device operating lever is operated from the neutral position to the operating position, the movable part on the operating lever acts on the actuator, and the internal electric circuit is A limit switch that closes the circuit, and a time-limited break contact that closes the internal main electrical circuit when the relay circuit is closed, and opens the internal main electrical circuit after a certain period of time when the relay circuit is opened. automatic vibration suppression for wheeled construction machinery, wherein the limit switch is connected in the middle of the relay circuit of the relay, and the receiving part of the electromagnetic switching valve is configured to lead power through the relay. Device.