On April 28, 2022, the 40th anniversary commemorative event of Zhejiang University's fluid transmission and control discipline and the 58th anniversary symposium of Academician Lu Yongxiang's teaching were held in conference rooms 212 and 211 of Shaoke Building, Yuquan Campus. The meeting summed up the development achievements of fluid transmission and control over the past 40 years, talked about the outstanding contributions of Academician Lu Yongxiang, who cared about his country and country, pioneered and innovative, and the spirit of seeking truth from facts, rigorous and down-to-earth scholarship, inspiring teachers and students to forge ahead bravely and open up new opportunities.

​Everyone in the industry knows that piston accumulators are isolated hydraulic energy storage devices. It can be used to stabilize the pressure to eliminate the pulsating impact of the pressure in the oil circuit system. The piston accumulator can also be used as a storage and replenishment device for hydraulic energy. The accumulator is used to release the working oil in a short time to supplement the insufficient oil supply of the pump. So how to choose a piston accumulator? I will explain it in more detail below.

As we all know, hydraulic power machinery is a machine that uses liquid as the working medium to transfer energy to realize various processes. In addition to forging and forming, hydraulic power machinery can also be used for straightening, pressing, packing, pressing blocks and pressing plates. But do you really understand hydraulic power machinery? Let me explain to you the advantages and limitations of hydraulic power machinery.

Hydraulic cylinder is the actuator in the hydraulic transmission system, which is an energy conversion device that converts hydraulic energy into mechanical energy. The hydraulic motor realizes the continuous rotary motion, while the hydraulic cylinder realizes the reciprocating motion. There are three types of hydraulic cylinders: piston cylinder, plunger cylinder and swing cylinder. Piston cylinder and plunger cylinder realize reciprocating linear motion, output speed and thrust, and swing cylinder realizes reciprocating swing, output angular velocity (rotation speed) and torque. In addition to being used singly, hydraulic cylinders can also be used in combination of two or more or in combination with other mechanisms. to perform special functions. The hydraulic cylinder is simple in structure and reliable in operation, and has been widely used in the hydraulic system of machine tools.

The year 2022 is a very important year for the development of the Party and the country, and the year when the 20th National Congress of the Party will be held. What kind of new development prospect will China's "two sessions" unfold to the world? On the 5th, the government work report submitted to the Fifth Session of the 13th National People's Congress for deliberation put forward a series of new goals and new arrangements, sending a new signal of China's economic and social development.

Hydraulic shocks in hydraulic pump stations are unavoidable. Hydraulic shock refers to a sudden change in pressure caused by a sudden change in the motion state of hydraulic oil in a hydraulic pump station. Hydraulic shocks can damage some hydraulic components in the hydraulic power pack. The reason is that when the hydraulic shock occurs, the local pressure may instantly increase several times or dozens of times. Therefore, the hydraulic shock is suppressed and the maximum possible hydraulic shock is estimated.