KR900014695A - Float Circuit for Construction Equipment - Google Patents

Abstract

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Description

Float Circuit for Construction Equipment

Since this is an open matter, no full text was included.

1 is a circuit diagram of a float circuit showing a preferred embodiment of the present invention,

FIG. 2 is a view similar to FIG. 1 showing another preferred embodiment of the present invention;

3 and 4 show yet another embodiment of the present invention.

Claims (8)

In the float circuit for the buoy of construction equipment of the type comprising a lower structure, an upper rotary structure on the lower structure, a work attachment mounted to the front portion of the upper rotary structure, and a buoy for the work attachment, wherein the circuit operates the buoy. And an intermittent oil passage position in which a boolean cylinder, a directional control valve, a pair of actuating circuits for communicating the boom cylinders and the directional control valves, and the actuating circuits are not in communication with each other by a selector valve. A float circuit for construction equipment, comprising: a selector valve configured to have a float oil passage position in which an operating circuit communicates with each other so that the boom cylinder can take a floating state. 2. The float circuit of claim 1 wherein the selector valve is manually operated between the intermittent oil passage position and the float oil passage position. 2. The solenoid valve of claim 1, wherein the selector valve is a solenoid operated valve, and is composed of an electric circuit means for alternately positioning the solenoid operating valve between an intermittent oil passage position and a float oil passage position. And a manual contact type switch having a position in which the actuating valve is in the intermittent oil passage position and another position in which the solenoid actuating valve is in the float oil passage position. The solenoid valve of claim 1, wherein the selector valve is a solenoid operated valve, the selector valve further comprising an electric circuit means for alternately positioning the solenoid operating valve between the intermittent oil passage position and the float oil passage position. A float circuit for buoyant construction equipment comprising a self-return type manual operated switch having a normal position in which the actuating valve is in the intermittent oil passage position and another position in which the solenoid actuating valve is in the float oil passage position. . The float circuit of claim 4, wherein the electric circuit means further comprises a manual contact type switch connected in series with the manual operation switch. 2. The float circuit of claim 1 wherein the selector valve is a pilot valve and further includes control means for controlling pilot pressure acting on the pilot valve. 7. The control circuit according to claim 6, wherein the control means includes a solenoid actuating valve connected to the pilot valve and an electric circuit means for controlling the solenoid actuating valve, wherein the electric circuit means is a normal position in which the pilot valve is in an intermittent oil passage position. And, an automatic return type manually operated switch having another position in which the pilot valve is placed in the float oil passage position. The float circuit of claim 7, wherein the electric circuit means further comprises a passive contact type switch connected in series with the manual operation switch. ※ Note: The disclosure is based on the initial application.