Hydraulic system structure

Hydraulic system structure

The hydraulic system is composed of two parts: signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part.

The hydraulic power part is represented by a circuit diagram to show the relationship between different functional components. The hydraulic source includes hydraulic pump, motor and hydraulic auxiliary components; The hydraulic control part contains a variety of control valves for controlling the flow, pressure and direction of the working oil; The actuator contains a hydraulic cylinder or a hydraulic motor, which can be selected according to actual requirements.

In the analysis and design of the actual task, the block diagram is generally used to show the actual operating status of the equipment. The hollow arrow represents the signal flow, while the solid arrow represents the energy flow. The sequence of action in the basic hydraulic circuit - reversing and spring return of the control element (two-position four-way reversing valve), extension and retraction of the actuator (double-acting hydraulic cylinder) and opening and closing of the relief valve. For the executive and control elements, the presentation is based on the corresponding loop diagram symbols, which also prepare for the introduction of loop diagram symbols.

Depending on how the system works, you can number all loops in turn. If the first execution element is numbered 0, its associated control element identifier is 1. If the element identifier corresponding to the execution element extension is even, the element identifier corresponding to the execution element retraction is odd. Not only should the hydraulic circuits be numbered, but the actual equipment should also be numbered so that system failures can be detected.

The DIN ISO1219-2 standard defines the numbering composition of components, which consists of the following four parts: device number, loop number, component identifier and component number. If there is only one device in the entire system, the device number can be omitted.

In practice, another numbering method is to serial number all components in the hydraulic system, at this time, the component number should be consistent with the component list number. This method is particularly suitable for complex hydraulic control systems where each control loop corresponds to its system number.