Sheet Metal · 2022年9月5日

Introduce typical hydraulic transmission system

The hydraulic transmission system is based on the working requirements of the mechanical equipment, and the appropriate hydraulic basic circuit is selected and organically combined. Reading a more complicated hydraulic system diagram can roughly follow the steps below:

  • (1) Understand the requirements of the hydraulic system for the working conditions of mechanical equipment, and understand the quality and quantity requirements of the three parameters of force, speed and direction in each step of the work cycle.
  • (2) Read the hydraulic system diagram for the first time, understand which components are included in the system, and decompose the system into several work units with the executive components as the center.
  • (3) Analyze each sub-system separately to understand the relationship between its actuators and corresponding valves and pumps and which basic circuits. Refer to the electromagnet action table and the action requirements of the actuator to clarify the fluid flow route.
  • (4) According to the interlocking, synchronization, anti-interference and other requirements of the various actuators in the system, analyze the connection between the various subsystems and how to achieve these requirements.
  • (5) On the basis of a comprehensive understanding of the hydraulic system, according to the performance of the basic circuit used by the system, make a comprehensive analysis of the system, summarize and summarize the characteristics of the entire hydraulic system, in order to deepen the understanding of the hydraulic system.

There are many types of hydraulic transmission systems, and its applications involve various fields such as machinery manufacturing, light industry, textiles, engineering machinery, ships, aviation and aerospace, but according to its working conditions, typical hydraulic systems can depend on the working conditions and characteristics of the hydraulic transmission system. Divided into the following categories.

(1) Hydraulic system based on speed conversion (such as modular machine tool system)

  • 1) Automatic working cycle of working parts can be realized, and the productivity is high.
  • 2) When fast forward and work forward, the speed and load are quite different.
  • 3) Stable feed speed, good rigidity, and a large speed range are required.
  • 4) The repetitive position of the end of the feed stroke has high accuracy and a strict sequence of actions.

(2) Hydraulic systems (such as Hydraulic Press systems) based on pressure conversion.

  • 1) The system pressure must be able to be changed and adjusted frequently, and can generate a lot of thrust.
  • 2) The speed is high in idle, the thrust is large when pressurized, and the power utilization is reasonable.
  • 3) The system mostly uses a combination of high and low pressure pumps or constant power variable pumps to supply oil to meet the speed and pressure changes during idle stroke and compression.

(3) Hydraulic system (such as grinder system) based on commutation accuracy

  • 1) It is required to have high smoothness of movement and low stable speed.
  • 2) Start and brake are fast and stable, without impact, and have a high commutation frequency (up to 150 times/min).
  • 3) High commutation accuracy, and adjustable forward stay time.

(4) A hydraulic system with multiple actuators working together (such as a manipulator hydraulic system)

  • 1) Under the frequent switching of each actuator action and sudden pressure changes, the system is reliable enough to avoid misoperation.
  • 2) Strict sequence of actions can be realized, and the specified work cycle of the working parts can be completed.
  • 3) Meet the requirements of various actuators for speed, pressure and commutation accuracy.

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