JPH0284001U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a hydraulic circuit diagram of a rotating body control device for an industrial construction machine in one embodiment of the present invention, and Fig. 2 is a hydraulic circuit diagram of a rotating body control device for an industrial construction machine in another embodiment of the present invention. It is. 1...Hydraulic pressure motor, 1a...Pressure fluid supply port, 1b
...Pressure fluid discharge port, 2...Swivel body, 3...Mechanical brake device, 4...Swivel direction switching valve, 8...
Bypass solenoid switching valve, 8c...Solenoid, 9
...Solenoid switching valve for brake release, 9c...Solenoid, 12...Mode selection switch, 13a, 1
3b... Opening/closing switch, 15... Turning interlocking switch, 16... Timer device, 31... Turning interlocking switch, 34... Non-turning interlocking switch.

Claims (1)

[Claims for Utility Model Registration] 1. A revolving body control device for industrial construction equipment that controls a hydraulic motor for rotating a revolving body and a hydraulic mechanical brake device for stopping the revolving body, a rotation direction switching valve that controls the operating pressure fluid supplied to the motor and switches the hydraulic motor between forward rotation, reverse rotation, and non-rotation; a pressure fluid supply port of the hydraulic motor; a bypass electromagnetic switching valve that switches between communicating with the discharge port and cutting off the communication; and a brake release valve that switches between supplying and discharging brake release pressure fluid to the mechanical brake device. A mode selection switch having an electromagnetic switching valve, a pair of open/close switches whose opening and closing states are reversed, a swing-linked switch that opens and closes in conjunction with the swing direction switching valve, and a timer device, One of the open/close switches, the rotation interlocking switch, and the timer device are connected in series between the solenoid of the brake release solenoid switching valve and a power source, and the other open/close switch of the mode selector switch is connected to the bypass solenoid. When connected between the solenoid of the switching valve and the power supply and selecting one mode with the mode switching switch,
When the brake of the mechanical brake device is activated after a predetermined time set in the timer device has elapsed when the swing direction switching valve is switched to the neutral state, and the other mode is selected by the mode selector switch, the Turning of industrial and construction equipment, characterized in that the pressure fluid supply port and the pressure fluid discharge port of the hydraulic motor are communicated with each other by a bypass electromagnetic switching valve, and the brake of the mechanical brake device is released. Body control device. 2 The other open/close switch of the mode selector switch includes a swing-linked switch that opens and closes in conjunction with the swing direction selector valve, and a swing-linked switch that opens and closes in conjunction with operations to operate driving equipment other than the hydraulic motor that swings the rotating structure. When a series circuit with a non-swing interlocking switch is connected in parallel, and one mode is selected by the mode selector switch, the predetermined time set in the timer device is activated when the swing direction selector valve is switched to the neutral state. When the brake of the mechanical brake device is activated after a certain period of time has elapsed, and the swing direction switching valve is in a neutral state and the driving equipment is activated, the bypass electromagnetic switching valve is used to connect the hydraulic fluid supply port and the hydraulic fluid discharge port of the hydraulic motor. When the outlets communicate with each other and the brake of the mechanical brake device is activated, and the mode selector switch selects the other mode, the bypass electromagnetic switching valve connects the hydraulic fluid supply port and the hydraulic fluid drain of the hydraulic motor. The revolving body control device for industrial and construction machinery according to claim 1, wherein the exits communicate with each other and the brake of the mechanical brake device is released.