Emergency landing hydraulic system using oil return logic valve
A hydraulic system and logic valve technology, applied in the direction of fluid pressure actuators, servo motors, servo motor components, etc., can solve problems such as the inability to achieve leveling of the working platform, the safety of workers cannot be guaranteed, and the logic is simple and rough, etc., to achieve perfection Emergency landing technology, ensuring high safety and high reliability, and facilitating popularization and application
Inactive Publication Date: 2016-10-26
XCMG FIRE FIGHTING SAFETY EQUIP CO LTD
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Problems solved by technology
[0009] 1. The logic of the above-mentioned emergency landing system is simple and rough, mainly to realize the emergency landing function, and the oil replenishment effect is not good;
[0010] 2. During an emergency landing, the hydraulic oil directly flows back into the hydraulic oil tank, and no system pressure is generated or the system pressure is relatively small. Therefore, the working platform cannot be leveled during an emergency landing, and the safety of the operators on the platform cannot be guaranteed.
Method used
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Embodiment Construction
[0037] The present invention will be further described below in conjunction with accompanying drawing.
[0038] Among them, this system is especially suitable for lifting work vehicles such as: climbing fire trucks and aerial work platforms.
[0039] Such as image 3 with Figure 4 As shown, an emergency landing hydraulic system using oil return logic valve, which includes:
[0040] Oil return logic valve;
[0041] It is set in the circuit of the hydraulic system, by preventing the hydraulic oil from directly returning to the hydraulic oil tank, accumulating the hydraulic oil to generate system pressure to meet the pressure required for leveling the working platform, so as to realize the secondary leveling of the working platform.
[0042] Such as Figure 5 As shown, the oil return logic valve includes: luffing oil supply check valve 7, emergency landing safety solenoid valve 9, logic relief valve 14, logic check valve I15 and logic check valve III17;
[0043] In the proc...
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The invention discloses an emergency landing hydraulic system using an oil return logic valve. The oil return logic valve is added on a traditional system, and is arranged in a loop of the hydraulic system; in emergency landing, hydraulic oil is stopped from directly returning into a a hydraulic oil tank for accumulation to generate system pressure to satisfy pressure needed by leveling of a working platform so as to realize secondary leveling of the working platform; and the oil return logic valve comprises a variable amplitude oil replenishing one-way valve (7), an emergency landing safety electromagnetic valve (9), a logic overflow valve (14), a logic one-way valve I (15) and a logic one-way valve III (17) integrated as a whole. The emergency landing hydraulic system uses the oil return logic valve for converting the gravity of an arm frame and the platform in emergency landing to hydraulic power to realize secondary leveling of the working platform so as to safely send operators back to the ground.
Description
technical field [0001] The invention relates to an emergency landing hydraulic system for a climbing fire truck or an aerial work platform, in particular to an emergency landing hydraulic system using an oil return logic valve. Background technique [0002] For climbing fire trucks and aerial work platforms that mainly carry out high-lifting operations, a balance valve is usually installed on the pressure chamber of the hydraulic cylinder (luffing cylinder, telescopic cylinder, etc.) performing high-lifting operations. To carry out fire rescue or high-altitude operations at a certain height, an emergency landing solenoid valve is usually installed on the rodless chamber of the hydraulic cylinder. The valve uses the gravity of the load to return the hydraulic oil in the rodless chamber to the hydraulic oil tank. At this time, the oil cylinder is used for retraction, and the boom and working platform approach the ground smoothly from a high altitude to realize the safe return ...
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IPC IPC(8): F15B11/16F15B13/06
CPCF15B11/16F15B13/06
Inventor 黎江孔德美卢良卫韩记生
Owner XCMG FIRE FIGHTING SAFETY EQUIP CO LTD