A pneumatic control valve and a gas-hydraulic pressure conversion control device

Abstract

An air-liquid pressure conversion control device. The device uses a combination of a large-diameter air cylinder and a small-diameter hydraulic cylinder, and drives a piston of the hydraulic cylinder to reciprocate by utilizing the push-pull reciprocating movement of the air cylinder, so as to complete oil suction and oil output functions of the device. A pneumatic control valve (10) is further disclosed. Air intake is controlled by the pneumatic control valve and then a piston rod (8) is pushed to move, oil cylinders are controlled to output oil alternately to provide pressure, and the oil output pressure of a hydraulic system composed of the oil cylinders is controlled by regulating an air intake pressure by the pneumatic control valve. A hydraulic energy accumulator buffers pressure pulsation, caused by discontinuous oil supply occurring at the reversing moment of the air cylinder, of the air-liquid pressure conversion control device. Moving components such as the piston of the device are made of aluminum alloy materials. The weight of reciprocating movement components is reduced as much as possible while the strength is ensured, the reversing sensitivity is improved, and the pressure pulsation is also reduced while the energy consumption of reversing is reduced.

Description

technical field [0001] The invention belongs to gas-liquid conversion equipment, in particular to a pneumatic control valve and a gas-liquid pressure conversion control device. Background technique [0002] At present, the hydraulic systems of CNC machine tools basically use electric motors to drive hydraulic pumps to provide chucks, tailstocks, and high-pressure oil required for the operation of tool holders to drive them to operate. The advantage of this oil supply method is that the oil supply pressure is stable, the oil supply pulsation is small, and the noise is small, but the disadvantages of this oil supply method are also obvious, mainly in the following aspects: First, the oil pump motor unit occupies the upper cover of the oil tank. The space is larger; second, the weight of the oil pump motor unit is relatively large; third, the energy consumption of the oil pump motor unit is relatively large, especially when the hydraulic system needs to maintain pressure, the o...

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Problems solved by technology

The advantage of this oil supply method is that the oil supply pressure is stable, the oil supply pulsation is small, and the noise is small, but the disadvantages of this oil supply method are also obvious, mainly in the following aspects: First, the oil pump motor unit occupies the upper cover of the oil tank. The space is larger; second, the weight of the oil pump motor unit is relatively large; third, the energy consumption of the oil pump motor unit is relatively large, especially when the hydraulic system needs to maintain pressure, the oil pump needs to continuously provide high-pressure oil to the chuck. To maintain the clamping of the chuck, the motor must run at full speed all the time, this part of energy is wasted, although most hydraulic stations now

[0003] The automatic variable pump is selected to reduce the energy consumption of the system to a certain extent, but the hydraulic system still needs to consume a lot of power when it is always running under high pressure, and the efficiency of the motor under light load is also low

Large energy consumption also makes the oil temperature of the hydraulic system easy to rise, so that the hydraulic system has to take auxiliary measures such as increasing the volume of the oil tank and adding an air cooler or water cooler to help the hydraulic system dissipate heat, which increases the size of the hydraulic system and occupies There is a lot of space in the inner panel of the machine tool, and the heat dissipation design of the hydraulic system needs to be considered in the machine tool, which increases the workload of the machine tool design

At present, the gas-liquid booster device can solve the energy consumption problem of the hydraulic system. The gas-liquid booster device is driven by the reciprocating action of the cylinder to provide the high-pressure oil required for the operation of the machine tool. It is enough to maintain a certain pressure in the cylinder, and the cylinder does not move. At this time, the energy consumption of the hydraulic system is extremely small, the system does not generate heat, and no heat dissipation device is required, so the size of the hydraulic system can be greatly reduced, but the current gas-liquid pressurization Due to the reciprocating motion of the cylinder to absorb and discharge oil, the device has the disadvantages of unstable oil supply pressure and large oil supply pulsation

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