Arm support dynamic load protective method with buffer slow-release containing cavity arranged on balance valve
A technology of balance valve and protection method, which is applied in the direction of mechanical equipment, construction material processing, fluid pressure actuation device, etc., and can solve problems such as large response overshoot, high working pressure of oil cylinder, and reduced construction efficiency
Inactive Publication Date: 2013-07-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
However, the secondary relief valves of the current balance valves all belong to the direct-acting structure. In addition, the working pressure of the boom oil cylinder is relatively high, and the response overshoot is large, so the protection effect on the dynamic load of the boom is not good; moreover, with each Once the secondary relief valve of the balance valve is opened, part of the flow will be released, causing the position of the oil cylinder to retract, resulting in a change in the position of the feed port of the boom. The operator has to adjust the position of the boom frequently, which reduces the construction cost. efficiency
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[0016] The specific embodiment of the present invention is: when the boom is deployed, the balance valve 3 locks the supporting oil chamber of the hydraulic cylinder 2, because the pressure of the compressed gas in the airbag type elastic buffer chamber 1 is slightly higher than that of the hydraulic cylinder 2 supporting the boom Working pressure, there is no oil in it; when the dynamic load or vibration of the boom makes the pressure in the support chamber of the hydraulic cylinder 2 rise, a part of the oil will enter the airbag-type elastic buffer chamber 1, so that the hydraulic cylinder 2 is moving Under the action of the load, the boom can be slightly retracted, and the boom can be lowered accordingly, avoiding the damage to the boom caused by the rigid support of the hydraulic cylinder 2; with the lowering of the boom and the effect of its structural elasticity, the pressure caused by the dynamic load is reduced, The pressure oil stored in the airbag-type elastic buffer ...
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Provided is an arm support dynamic load protective method with a buffer slow-release containing cavity arranged on a balance valve. A hydraulic system comprises an air bag type elastic buffer containing cavity 1, a hydraulic oil cylinder 2, the balance valve 3, a reversing valve 4 and a one-way throttle valve 5. The air bag type elastic buffer containing cavity 1 is arranged on the balance valve 3. The arm support dynamic load protective method is characterized in that the air bag type elastic buffer containing cavity 1 is arranged on the balance valve 3 and is communicated with a supporting cavity through the one-way throttle valve 5, an oil channel and the hydraulic oil cylinder 2 are arranged in the supporting cavity, and pressure of compressed air in the air bag type elastic buffer containing cavity 1 is slightly higher than working pressure of a supporting arm support of the hydraulic oil cylinder 2. The working principle is that when arm support dynamic load or vibration enables pressure in the supporting cavity of the hydraulic oil cylinder 2 to be increased, part of oil liquid can enter into the air bag type elastic buffer containing cavity 1, damage on the arm support by rigid supporting of the hydraulic oil cylinder 2 is avoided, along with lowering of pressure caused by dynamic load, pressure oil stored in the air bag type elastic buffer containing cavity 1 can be gradually discharged to the supporting cavity of the hydraulic oil cylinder 2, and accordingly the arm support is kept at an original position.
Description
1. Technical field: [0001] The invention relates to a dynamic load protection method for a boom in which a buffer slow-release chamber is arranged on a balance valve. 2. Background technology: [0002] With the popularization and mandatory adoption of commercial concrete in our country, various concrete pumping equipment are popularized and applied. [0003] Among all kinds of concrete pumping equipment, the concrete pump truck has obvious advantages such as convenient movement and flexible control of the position of the feeding arm, and has achieved considerable development in recent years. [0004] In order to increase the feeding distance of the boom, the length of the boom of the concrete pump truck is continuously lengthened. In order to ensure the stability of the whole vehicle, while the boom is lengthened, the lightweight of the boom is one of the main directions for the development of concrete pump truck technology. [0005] The boom of the concrete pump truck is ...
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IPC IPC(8): F15B15/22F15B1/02E04G21/04
Inventor 杨洁
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY