Working principle: As an actuator, the hydraulic cylinder is essentially an energy conversion device. The hydraulic cylinder converts the pressure energy of the input liquid into the mechanical energy of the linear motion of the piston.
The so-called input hydraulic energy refers to the flow rate and pressure of the input liquid, and the output mechanical energy refers to the speed v (m/s) and traction force f of the piston when it moves. All these parameters are realized by changes in working volume, so the hydraulic cylinder is a positive displacement actuator.
Hydraulic cylinders have a variety of structures and different performances. According to the mode of action of hydraulic force, it can be divided into single-acting hydraulic cylinder and double-acting hydraulic cylinder; according to its structural characteristics, it can be divided into plunger hydraulic cylinder, piston hydraulic cylinder, telescopic hydraulic cylinder and swing hydraulic cylinder.
Extended information
Notes on cylinder disassembly and assembly:
1. Before disassembling the hydraulic cylinder, the hydraulic circuit should be depressurized.
2. When disassembling, avoid damaging the top thread of the piston rod, the oil port thread, the surface of the piston rod, the inner wall of the cylinder liner, etc.
3. Disassembly should be carried out in order.
4. Before and after unloading, try to create conditions to prevent the parts of the hydraulic cylinder from being contaminated by surrounding dust and impurities.
5. After the cylinder is disassembled, check carefully to determine which parts can continue to be used, which parts can be repaired and reused, and which parts must be replaced.
6. All parts must be cleaned carefully before assembly.
7. Install the sealing devices everywhere correctly
8. When tightening the threaded joints, a special wrench should be used, and the torque should meet the standard requirements.
9. After the piston and piston rod are assembled, it is necessary to measure whether their coaxiality and straightness over the entire length are out of tolerance.
10. After assembly, there should be no sense of blockage or uneven resistance when the piston assembly moves.
11. When the hydraulic cylinder is installed on the main engine, a sealing ring must be added directly to the inlet and outlet joints and tightened to prevent oil leakage.
12. After assembly as required, several reciprocating movements should be performed under low pressure to eliminate gas in the cylinder.
Baidu Encyclopedia-Hydraulic cylinder (mechanical equipment) = oil cylinder