A combination of pump control cylinder electro -hydraulic control system
An electro-hydraulic control system, combined technology, applied in fluid pressure actuation system components, servo motor components, fluid pressure actuation devices, etc., can solve the problem that the frequency response is difficult to meet the work requirements, etc., to achieve low cost, reduce Pressure loss, the effect of small pressure loss
Active Publication Date: 2018-08-07
ZHEJIANG UNIV
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Problems solved by technology
For large-flow proportional servo systems, due to the large hydraulic force, the control of proportional valves or servo valves needs to be realized by multi-stage pilot valves, and its frequency response is difficult to meet the actual work requirements.
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Embodiment Construction
[0026] The design idea of the present invention is illustrated below through a schematic diagram.
[0027] Such as figure 1 As shown, the pump-controlled cylinder electro-hydraulic control system of the present invention consists of six hydraulic pumps, numbered A-F, a small flow relief valve 1, a small flow proportional reversing valve 2, a hydraulic cylinder 3, a large flow electromagnetic reversing valve 4, Safety valve 5, 5 one-way poppet valves 6, 5 two-position two-way cut-off solenoid valves 7, and an oil tank.
[0028] The structure of the whole system is: pump A, pump C, pump F are driven by one motor, pump B, pump D, pump E are driven by another motor; the outlet of pump A is connected to small flow relief valve 1 and small flow proportional switch connected to the valve 2; the oil outlet of the pump B-F is connected with a two-position two-way stop solenoid valve 7 and a one-way poppet valve 6, and finally enters the working chamber of the hydraulic cylinder 3 th...
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The invention discloses a combined pump-controlled cylinder electric hydraulic control system which comprises a plurality of hydraulic pumps, a low-flow overflow valve, a high-flow overflow valve, a low-flow proportional reversing valve, a high-flow electromagnetic reversing valve, a plurality of one-way conical valve and a plurality of two-position and two-way electromagnetic valves. The low-flow proportional reversing valve is communicated with an oil outlet of the first pump to accurately determine the flow of a first control pump, the high-flow electromagnetic reversing valve is communicated with a public oil outlet of the other pumps and only can function in reversing, connection and disconnection of the two-position and two-way electromagnetic valves connected with the other pumps control whether the other pumps discharge oil or not, hydraulic oil flow of a whole system entering a working cavity of a hydraulic cylinder can randomly change in numerical values of the sum of the flow of all pumps, and final flow control accuracy is determined by the control accuracy of the low-flow proportional valve. The combined pump-controlled cylinder electric hydraulic control system can effectively solve the problems of high pressure loss and low frequency response in the high-flow servo proportional electric hydraulic control system, and energy is greatly saved.
Description
technical field [0001] The invention relates to a combined pump-controlled cylinder electro-hydraulic control system. More precisely, it involves a hydraulic system that utilizes multiple hydraulic pumps to precisely control the output position and speed of hydraulic cylinders. Background technique [0002] The current electro-hydraulic control system widely uses components such as proportional valves or servo valves to achieve servo and proportional control, but such technical solutions have obvious shortcomings: [0003] 1. Large pressure loss and low energy utilization efficiency. Since the basic principle of the valve control scheme is to use the principle of throttling and speed regulation, its disadvantages are throttling loss, large energy consumption, and serious system heating, resulting in instability or failure of the hydraulic system. Especially for the large flow proportional servo system, the pressure loss is particularly serious. [0004] 2. Low frequency r...
Claims
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IPC IPC(8): F15B11/02F15B13/04F15B13/16F15B21/08
CPCF15B11/02F15B11/17F15B13/0401F15B21/08
Inventor 王林翔陈惟峰吴庭
Owner ZHEJIANG UNIV