Comparison of the advantages and disadvantages of mechanical, electrical, hydraulic and pneumatic transmission methods

2) In terms of working performance, the speed, torque and power can be adjusted steplessly, the action is responsive, and it can quickly change direction and speed. The speed regulation range is wide, and the speed regulation range can reach 100:1 to 2000:1; the action is fast, the control and adjustment are relatively simple, the operation is relatively convenient and labor-saving, and it is easy to coordinate with electrical control and connect with the CPU (computer), so it is easy to realize automation.

3) From the perspective of use and maintenance, the components have good self-lubrication, are easy to implement overload protection and pressure maintenance, and are safe and reliable; the components are easy to implement serialization, standardization, and generalization.

4) All equipment using hydraulic technology has good safety and reliability.

5) Economy: Hydraulic technology is highly flexible and changeable, which can increase the flexibility of flexible production and make it easy to change and adjust the production process. Hydraulic components are relatively inexpensive to manufacture and have strong adaptability.

6) Hydraulics can be easily combined with new technologies such as microcomputer control to form "mechanical-electrical-hydraulic-optical" integration, which has become a world development trend and facilitates digitalization.

Everything has two sides, advantages and disadvantages. Hydraulic transmission is no exception:

shortcoming:

1) Hydraulic transmission inevitably has leakage due to the relative motion surface. At the same time, the oil is not absolutely incompressible. In addition, due to elastic deformation of the oil pipe, hydraulic transmission cannot obtain a strict transmission ratio. Therefore, it cannot be used in the inline transmission chain of machine tools such as threaded gear processing.

2) There are losses along the oil flow, local losses and leakage losses, the transmission efficiency is low, and it is not suitable for long-distance transmission.

3) There are certain difficulties in using hydraulic transmission under high and low temperature conditions.

4) In order to prevent oil leakage and to meet certain performance requirements, hydraulic components require high manufacturing precision, which brings certain difficulties to use and maintenance.

5) Faults are difficult to check, especially in units where hydraulic technology is not widely used. This contradiction often hinders the further promotion and application of hydraulic technology. Hydraulic equipment maintenance requires certain experience, and it takes a long time to train hydraulic technicians.