How to analyze the performance of a hydraulic system
The control element (i.e., various hydraulic valves) controls and regulates the pressure, flow and direction of the fluid in the hydraulic system. Hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves according to the control function. The pressure control valve is divided into the benefit flow valve (relief valve), pressure relief valve, sequence valve, pressure relay, etc. Flow control valves include throttle valves, adjustment valves, and diverter collector valves; Directional control valves consist of one-way valve, liquid control one-way valve, shuttle valve, reversing valve, etc. According to the control mode, the hydraulic valve can be divided into switch control valve, fixed value control valve and proportional control valve. Auxiliary components including oil tank, oil filter, oil pipe and tube joint, sealing ring, quick change connectors, high pressure ball valve, hose assembly, the contact pressure, pressure gauge, oil level, oil temperature gauge, etc. Hydraulic oil is the medium of the energy transfer energy in hydraulic system, there are various kinds of mineral oil, emulsified liquid and hydraulic oil. Hydraulic system structure The hydraulic system consists of two parts, signal control and hydraulic power, which are used to drive the control valve actions in the hydraulic power parts.
N: the function of the hydraulic system is to increase the force of pressure by changing the pressure. A complete hydraulic system consists of five parts: the power component, the execution component, the control element, the auxiliary component (the attachment) and the hydraulic oil. The stand or fall of a hydraulic system depends on the rationality of the system design, system components, the performance of the system of pollution prevention and treatment, and the last point is particularly important. In recent years, domestic hydraulic technology has been greatly improved, and it is no longer simply using foreign hydraulic technology. Definition: a complete hydraulic system consists of five parts: the power component, the actuator, the control component, the auxiliary component (the attachment) and the hydraulic oil. The power element is used to convert the mechanical energy of the original motive into the liquid pressure energy, which is the oil pump in the hydraulic system, which provides the power to the whole hydraulic system. The hydraulic pump is structured in the form of gear pumps, vane pumps and plunger pumps. The function of the actuator, such as a hydraulic cylinder and hydraulic motor, is to convert the pressure of the liquid to the mechanical energy, and the driving load as a straight and reciprocating motion.
Not only should the hydraulic circuit be numbered, but the actual equipment is also numbered, so that the system failure can be detected. The DIN iso1219-2 standard defines the number of elements, including the following four parts: device number, loop number, component identifier, and element number. If the entire system has only one device, the device number is omitted. Practice, another numbering is to all components in the hydraulic system are numbered consecutively, at this point, the component number should be consistent with the elements in the list number. This method is especially suitable for complex hydraulic control system, and each control circuit corresponds to the system number.
The hydraulic power parts are represented by circuit diagram to show the relationship between different functional elements. Hydraulic sources contain hydraulic pump, motor and hydraulic auxiliary elements; The hydraulic control section contains all kinds of control valves, which are used to control the flow, pressure and direction of the working fluid. The execution part contains hydraulic cylinder or hydraulic motor, which can be chosen according to the actual requirement. When analyzing and designing actual tasks, it is generally used to show the actual running condition of the equipment. The hollow arrow indicates the signal flow, while the solid arrow indicates the energy flow. Basic - controls the action of hydraulic loop of the sequence component (ii) a four-way reversing valve of the reversing and spring return actuators (double-acting hydraulic cylinder) reached out and retraction and overflow valve opening and closing. For the execution of the component and the control component, the presentation is based on the corresponding circuit diagram symbol, which is also the preparation for the circuit diagram notation. Based on how the system works, you can number all the loops in turn. If the first execution element is 0, the associated control element identifier is 1. If the component identifier that corresponds to the execution element is even, then the component identifier corresponding to the execution component retracted is odd.
