Compared with other transmission modes, Hydraulic transmission It has the following advantages and disadvantages.
1、 Advantages of hydraulic transmission 1) Hydraulic transmission can output large driving force or torque, and can achieve low-speed and large tonnage movement, which is an obvious advantage that other transmission methods cannot compare. 2) The hydraulic transmission energy is more convenient to achieve stepless speed regulation. The range of speed change is large, and the speed can be changed when the system is running. 3) At the same power, Hydraulic transmission device Small size, light weight and compact structure. The hydraulic components can be connected with each other by pipes or integrated connection. Their reasonable layout and assembly are relatively flexible and can form a complex system that cannot be formed by other transmission methods. 4) The hydraulic transmission energy makes the movement of the actuating element very symmetrical and stable, and can make the moving component have no reverse impact when reversing. And because of its fast reaction speed, it can achieve frequent commutation. 5) It is easy to operate, adjust and operate, and achieve automation. Especially when combined with the machine and electricity, it can easily achieve complex automatic working cycle. 6) The hydraulic system is convenient for overpressure protection, safe and reliable. Because the moving parts in each hydraulic component work in the oil and can be lubricated independently, the service life of the components is long. 7) The hydraulic components are convenient for generalization, standardization and generalization, and convenient for design, manufacturing, maintenance and promotion. 2、 Disadvantages of hydraulic transmission 1) Oil leakage and liquid compressibility will endanger the accuracy of actuator movement, so it is impossible to ensure strict transmission ratio. 2) It is particularly sensitive to temperature changes and is not suitable for working at very high or low temperatures. 3) The energy loss (leakage loss, overflow loss, throttling loss, friction loss, etc.) is relatively large, the transmission efficiency is low, and it is not suitable for long-distance rotation. 4) When the system is abnormal, it is not easy to find the cause. In general, the advantages of hydraulic transmission are critical and obvious, and its disadvantages will gradually get rid of with the progress of science and technology. The development prospect of hydraulic transmission technology is very broad.
Compared with mechanical automatic rotation, hydraulic transmission has the following advantages:
(1) Large scale stepless speed regulation under operation
(2) Under the same output power, the hydraulic transmission device is small in size and light in weight and fast in response
(3) It can achieve clearance free rotation and stable movement
(4) IAM hydraulic motor Convenient to achieve automatic working cycle and automatic overvoltage protection
(5) Because oil is usually used as the rotating medium to lubricate hydraulic components, it has a relatively long service life
(6) Hydraulic components are standardized and universal products, which can be directly purchased from the market, which is beneficial to the design, manufacture, application and promotion of hydraulic systems
(7) The hydraulic cylinder with large driving force or the hydraulic pump with large torque can directly push the load, thereby eliminating the internal reducer and simplifying the rotation
The main disadvantages of hydraulic transmission are:
(1) In hydraulic transmission, the energy needs to be transformed twice, especially in the throttling speed regulation system, the pressure and flow losses are large, so the system efficiency is low
(2) The liquid is much more compressible than steel. In addition, there is inevitably oil leakage at the mating surface, so the general hydraulic transmission cannot be strictly driven in a fixed ratio
(3) The liquid performance is sensitive to temperature (mainly viscosity), which makes the performance of hydraulic transmission change with the change of temperature. It is difficult to ensure good performance at high and low temperatures; When using oil as transmission medium, pay attention to fire prevention
(4) The hydraulic components are required to have high processing accuracy. In addition, the hydraulic system generally requires independent energy (pump station composed of motor pump, etc.), which will increase the product cost
(5) It is difficult to find the fault of hydraulic system, which requires high technical level of maintenance personnel
To sum up, the advantages of hydraulic transmission are more than disadvantages, and with the improvement of technical level, some disadvantages have been overcome to varying degrees.
