Hydraulic valve controller for heavy construction installation

Abstract

Prevent the sudden drop of the actuator by discharging high-pressure hydraulic fluid into the channel on the liquid supply side of the actuator when the actuator is lowered, and provide a device installed on the channel between the hydraulic pump and the actuator and control the drive of the actuator The main spool shaft barrel, a poppet valve installed on the channel between the main spool shaft barrel and the actuator to prevent the actuator from descending, and a spool shaft barrel installed between the back pressure chamber and the return path of the poppet valve. When connecting the back pressure chamber and the channel on the discharge port of the main valve core shaft barrel, and a liquid flow reduction channel connecting the back pressure and the return flow channel when the valve core shaft barrel is switched, so as to reduce the hydraulic fluid discharged from the actuator.

Description

technical field [0001] The present invention relates to a hydraulic valve control device for heavy construction equipment, which can cause a small amount of high-pressure hydraulic fluid to be discharged when the hydraulic actuator is lowered toward the actuator holding valve core shaft barrel, so that when the main shaft is placed in neutral Or prevent the actuator from dropping suddenly when changing gears. Background technique [0002] Figure 1 shows the main components of a conventional hydraulic valve control for heavy construction equipment. As shown in Figure 1, the hydraulic valve control device for heavy construction equipment includes a hydraulic pump; an actuator 15 connected to the hydraulic pump and driven when hydraulic fluid is supplied; a poppet valve 10 for opening and closing passage 12, which can supply the hydraulic fluid discharged from the hydraulic pump and the passage 13 communicating with the actuator 15 to the actuator 15; a back pressure chamber 1...

AI Technical Summary

Problems solved by technology

[0011] Therefore, when the poppet valve moves due to the change in back pressure, the poppet valve 10 does not move up normally and smoothly, but is subjected to shocks, and similarly when the actuator 15 descends in a motion of a drop-stop-drop-stop pattern There will be vibration and swaying, which will distract the driver's attention during work, increase his fatigue and reduce work efficiency

[0012] According to this, there is also the problem that it is difficult to synchronize the opening time of the main spool barrel and the operating time of the actuator to hold the spool barrel by design, and the complicated structure also makes the design difficult

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