A control method of an energy-saving active and passive load dual electro-hydraulic servo valve control system
An electro-hydraulic servo valve and valve control system technology, applied in servo motor components, fluid pressure actuators, mechanical equipment, etc., can solve the problems of large negative pressure, oil absorption, etc., and achieve the effect of energy saving
Active Publication Date: 2015-11-18
BEIJING CISTI ENG
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Problems solved by technology
In the existing dual-valve independent control scheme, when a certain cavity of the hydraulic cylinder or hydraulic motor needs low-pressure oil supply, the negative pressure formed by the cavity is used to suck oil from the hydraulic oil tank. Although this scheme is relatively simple, if the hydraulic pressure The passive load on the cylinder or hydraulic motor is not large enough to form a large negative pressure, so it is difficult to directly suck oil from the tank
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[0031] Attached below figure 1 Examples are also given to describe the present invention in detail.
[0032] It is stipulated that the movement that gradually increases the volume of chamber A of the hydraulic cylinder 20 and gradually decreases the volume of chamber B is the extending movement, and vice versa is the retracting movement. The movement of the hydraulic motor 21 due to the pressure in chamber A being higher than the pressure in chamber B is clockwise rotation, otherwise it is counterclockwise rotation.
[0033] The composition and connection relationship of the energy-saving active and passive load dual electro-hydraulic servo valve control system proposed by the present invention are as follows:
[0034] One of the load ports of the first servo valve 1 is connected to the A port of the first two-position two-way solenoid valve 3, the other load port is connected to the A port of the second two-position two-way solenoid valve 4, and the second servo valve 2 One...
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The invention discloses an energy-saving active / passive load double electrohydraulic servo valve control system and a control method thereof. Through switching control of a valve control system oil circuit, the system not only can realize independent control of two cavities of a hydraulic cylinder or a hydraulic motor, but also has the functions of redundant backup, double-valve parallel control and hydraulic cylinder or hydraulic motor double-cavity lock-out control of electrohydraulic servo valves. Moreover, according to the invention, the oil supply modes of the electrohydraulic servo valves are specially designed, so as to save high-pressure energy and ensure that low-pressure oil can be provided for the hydraulic cylinder or the hydraulic motor under any circumstances.
Description
technical field [0001] The invention relates to the technical field of fluid transmission and control, in particular to a control method for an energy-saving active and passive load dual electro-hydraulic servo valve control system. Background technique [0002] The active load in the electro-hydraulic servo valve-controlled cylinder or electro-hydraulic servo valve-controlled motor system refers to the load on the hydraulic cylinder or hydraulic motor that hinders it from moving according to the set motion law, while the passive load is just the opposite , the load on the hydraulic cylinder or hydraulic motor will accelerate its movement according to the existing movement trend. Generally, under active load, it is necessary to provide a certain amount of hydraulic energy to the hydraulic cylinder or hydraulic motor to overcome the resistance of the load, while under passive load, it is not necessary to provide hydraulic energy to the hydraulic cylinder or hydraulic motor, b...
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IPC IPC(8): F15B13/04
Inventor 王军政赵江波汪首坤马立玲沈伟李静李金仓
Owner BEIJING CISTI ENG