Hydraulic pressure automatic control device
An automatic control device, a technology of hydraulic pressure, applied in the direction of fluid pressure actuation device, fluid pressure actuation system components, mechanical equipment, etc., can solve the problems of low control accuracy and small control range, and achieve convenient use and simple structure. , to achieve the effect of large-scale automatic pressure control
Active Publication Date: 2013-05-22
SICHUAN UNIV
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Problems solved by technology
[0003] In order to overcome the problem that the common hydraulic proportional pressure control valve has a small control range, especially when the pressure is low, the control accuracy is not high, the present invention provides an automatic pressure control device with a simple structure and easy implementation
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[0011] combine figure 1 and figure 2 , the embodiment of this device is: the pressure sensor (14) detects the actual pressure P1 of the liquid in the pressure vessel (13), and feeds back the measured value to the computer, and the computer calculates the deviation between the actual pressure P1 and the set pressure P0, and the deviation The value is transmitted to the control algorithm to calculate the control quantity, and the obtained control quantity is converted into a control current I through D / A, and output to the proportional valve to control the pressure of the hydraulic pressure automatic control device until the pressure of the liquid in the pressure vessel (13) is equal to Until the set value is consistent, the pressure of the whole device can be automatically controlled. At the same time, the computer compares the set pressure P0 with the switching pressure P (P=0.6MPa) to control the switching of the working mode of the equipment. When (P0>P), switch to the hi...
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Disclosed is a hydraulic pressure automatic control device. Automatic adjustment of pressure of the device is controlled by a computer control system. Automatic switchover of operating modes is achieved by comparing the pressure of the device with the switchover pressure. Pneumatic signals are converted into hydraulic working signals by a gas-liquid converter in a low pressure mode. Pressure of liquid in a pressure container is controlled indirectly through a pneumatic proportional pressure reducing valve. Pressure of a hydraulic return circuit is directly controlled and adjusted through an electro-hydraulic proportional pressure reducing valve in a high pressure mode so as to control the pressure of the liquid in the pressure container. A pneumatic pressure control return circuit is introduced on the basis of a hydraulic pressure automatic control return circuit so as to make up the defect that the hydraulic pressure automatic control return circuit is inaccurate (even uncontrollable) in pressure control when the control pressure is low, and therefore large-scale and high-precision pressure adjustment of the hydraulic device is achieved.
Description
technical field [0001] The invention relates to a hydraulic pressure automatic control device, which can realize high-precision and wide-range pressure control. Background technique [0002] In some force loading simulation equipment, the electro-hydraulic proportional system is generally used for loading. In order to achieve high force fidelity, accurate force loading must be ensured. However, since the minimum adjustment pressure of common proportional pressure valves is not less than 0.6MPa, when the pressure is lower than 0.6MPa, its pressure characteristics are non-linear, and there is a dead zone, so that the pressure cannot be automatically and accurately controlled. In order to accurately control the pressure of the device, special hydraulic valves are required, which will increase the cost of the device. The working pressure range of the common proportional pneumatic pressure valve is 0.01MPa-0.7MPa, which is suitable for automatic control of lower pressure. There...
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IPC IPC(8): F15B21/08
Inventor 熊瑞平涂海燕代小将张小龙
Owner SICHUAN UNIV