Hydraulic transmission: It uses hydraulic oil as the working medium, and the mechanical energy of the original motivation to hydraulic oil is controlled by the power component (oil pump). For mechanical energy, the drive load realizes straight lines or rotation motion, and the force and speed of the execution component is adjusted by controlling the control component remote control and adjustment of the flow. When the outside world is disturbed by the above system, the output volume of the execution component generally deviates from the original adjustment value, generating a certain error
Hydraulic control: Like hydraulic transmission, the system also includes power elements, control elements, and execution elements , Also pass the power through oil. The difference between the two is that the hydraulic control has a feedback device. The function of the feedback device is the feedback and input of the output (displacement, speed, force, etc.) of the execution component (can be changed or constant) Compare, the comparison deviation controls the system, so that the output of the execution component changes or keeps constant with the change of the input volume. It is a hydraulic transmission system that constitutes a closed -loop circuit, also called a hydraulic follow -up system or a hydraulic servo system.
\u0026 nbsp; \u0026 nbsp; \u0026 nbsp; \u0026 nbsp; hydraulic transmission system uses a cross -break or logical control element. Fixed values \u200b\u200band sequential control elements.
\u0026 nbsp; \u0026 nbsp; \u0026 nbsp; \u0026 nbsp; hydraulic control system uses servo control components, with feedback structures, and controlled by electrical devices. It has high control accuracy and response speed, controlled pressure and controlling pressure and control. Traffic often changes continuously. The output power can be enlarged.
The proportional control is a kind of control between the two above. The proportional control valve is a new type of electric -liquid -liquid based on the disconnected control element and the servo control element. Control components have both the characteristics of the above two types of components. It is used to use hand -tone interrupt controls that cannot meet the requirements, but there is no need to strict pollution control requirements for the hydraulic system as the servo valve.
2. The advantages and disadvantages of the hydraulic transmission system
\u0026 nbsp; \u0026 nbsp; \u0026 nbsp; \u0026 nbsp; In the current four categories of transmission (mechanical, electrical, hydraulic and gas pressure), none , And hydraulic transmission has the following extremely obvious advantages: (1) From a structural point of view, the output power of the unit weight and the unit size output power of the unit are pushed in the four types of transmission. In the case of transmitting the same power, the volume, light weight, low inertia, compact structure, and flexible layout of the hydraulic transmission device. (2) From the perspective of working performance, the speed, torque, and power can be regulated without stepping, the action response is fast, the direction and change can be quickly transformed, the speed regulation range is wide, and the speed regulation range can reach 100: L to 2000: 1; Good movement is good, control and adjust is relatively simple, and it is more convenient to controlSave effort, easy to cooperate with electrical control, and connect with the CPU (computer) to facilitate automation. (3) From the perspective of use and maintenance, the component’s self -lubrication is good, easy to achieve overload protection and pressure, safe and reliable; components are easy to achieve series, standardization, and generalization. (4) All equipment with hydraulic technology is safe and reliable. (5) Economy: The plasticity and variability of hydraulic technology are very strong, which can increase the softness of flexible production, and it is easy to change and adjust the production procedures. The hydraulic element is not high in manufacturing costs, and the adaptability is relatively strong. (6) The combination of new technologies such as hydraulic and microcomputer control constitutes the integration of \”machine-electricity-liquid-light\” integration has become the trend of the world development and facilitates digitalization.
Disadvantages of hydraulic transmission:
\u0026 nbsp; \u0026 nbsp; \u0026 nbsp; \u0026 nbsp; Ren Sheet Board Extrusion Line It is divided into two, and hydraulic transmission is no exception: (((((((((((((hydraulic transmission 1) The hydraulic transmission is unavoidable due to the inevitable surface of the motor surface. At the same time, the oil is not absolutely impossible. In addition, the elastic deformation of the oil pipe can not be obtained by the hydraulic transmission. In the internal link transmission chain. (2) In the process of oil flow, there are losses, local losses, and leaks in the process of oil flow. The transmission efficiency is low, and it is not suitable for long -distance transmission. (3) Under high temperature and low temperature conditions, it is difficult to use hydraulic transmission. (4) In order to prevent oil leakage and to meet the requirements of certain performance, hydraulic components have high accuracy requirements, which brings certain difficulties to use and maintenance. (5) It is not easy to check in failure, especially units with less popular hydraulic technology. This contradiction often hinders the further promotion and application of hydraulic technology. Hydraulic equipment repair requires dependence, and training hydraulic technicians for a long time.