The function of the hydraulic cylinder is to convert the pressure of the oil liquid into

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The advantages of hydraulic drive: 1 easy to obtain large force or torque, can realize low speed large tonnage transmission; It is easy to implement stepless speed control in a wide range of areas; Under the same conditions as the output power, the hydraulic transmission device is small, lightweight and compact. To make the motion of the actuator very uniform and stable, allowing the moving parts to change without impact. The hydraulic drive system is easy to operate, easy to control and easy to automate. The system is easy to implement overload protection, safe and reliable, and no loss of components due to overload. Because the hydraulic components are standardized, serialized and generalized, it is helpful to shorten the design of the machine, manufacture the cycle and reduce the manufacturing cost. Faults; Leakage (leakage and leakage); Troubleshooting difficulties; The system is inefficient; Working medium is sensitive to temperature change, not suitable for high and low temperature conditions. Sensitive to the pollution of the working medium, there needs to be good protection and filtration. The high cost. A hydraulic pump is a power element that turns mechanical energy into pressure energy. The hydraulic motor is the actuator that turns the pressure into mechanical energy

The hydraulic system is a mechanical component of mechanical transmission and automatic control through liquid, which is the mechanical energy of the working medium. The way the pressure of the liquid can be used for energy control and transmission is called hydraulic transmission. Using the kinetic energy of the liquid to carry out energy transfer is called the hydraulic drive. Hydraulic transmission is a kind of transmission that USES the compressed fluid in a closed system to transfer motion and power. Composition; Hydraulic system is made up of drive element (hydraulic pump). Control element (pressure, flow, direction control valves), executive components (hydraulic cylinder and hydraulic motor) auxiliary components (fuel tank, oil pipe, filters, etc.), working medium (oil)

The energy storage device is a kind of energy storage device that can store oil liquid and release it when needed. Classification; There are three kinds of functions of gravity, spring and inflatable: storing energy, absorbing pressure, and alleviating shock. It can be used as auxiliary device, emergency power source, maintenance system pressure and so on. Filter effect: purify the fluid, filter the impurities in the hydraulic oil, and control the level of contamination of the oil. Classification; The material can be divided into net filter, line gap filter, sintered filter, paper core filter and magnetic filter. The tubing is used to connect hydraulic components and deliver hydraulic oil. Classification by materials; Steel pipe, pure copper tube, rubber hose, nylon tube plastic pipe oil tank to store the hydraulic fluid needed for the hydraulic system, Hydraulic oil is used as the working medium in the system to transmit energy, drive system work, and lubricate, cool and rust. The characteristics of the hydraulic oil: density, compressibility, viscosity, abrasion resistance, resistance to oxidation stability and demulsibility, shear stability, resistance to foam, rubber swelling resistance, burning resistance and anti-rust, flow point of freezing point, flash point and burning point

Hydraulic cylinder is the executive components in the hydraulic system, is a kind of hydraulic pump will provide the energy of the hydraulic energy into mechanical energy conversion device, it used to drive straight line reciprocating movement or reciprocating swing work institutions. Classification; According to structure: piston type, plunger type and swing type. It is divided into two functions: single, double acting; Hydraulic cylinder consists of cylinder block, piston component, sealing device, buffer and exhaust. Common failure: the moving parts are not running or moving, the moving parts are crawling, the moving parts are changing to the impact, the external leakage, the piston rod pull. Hydraulic control valves control and adjust the flow direction, pressure and flow to meet the requirements of various operating conditions Classification; Points of action: direction, pressure, flow control valve; Press control: manual, motorized, electrodynamic, hydraulic. According to the installation form: pipe, plate, flange, stacking, plug connection. Control mode: switch control valve, proportional control valve, servo control valve, etc The servo system is a kind of automatic control system, the output of the system can be automatic, the change rule of the output quantity quickly and accurately. Hydraulic servo valve is the most basic and important element in hydraulic servo system which is the function of signal conversion and power amplification.

The classification of hydraulic pump: the variable pump and the quantity pump. Structural points: gear type, blade type and plunger type. Press pressure: low, medium, high, high pressure pump, etc. Flow direction: one-way and two-way pump. The hydraulic motor is the same thing. Hydraulic pump and motor differences: 1 power, hydraulic motor started by liquid pressure, pump direct drive 2 flow mechanism, hydraulic motor has positive &negative, hydraulic pump single turn 3 self-priming performance difference motor without imbibition, must be 4 to prevent leakage of self-priming pump form different pump USES the internal leakage, make motor 5 applications when volumetric efficiency is different, the motor volume big start torque hydraulic motor with low efficiency. Hydraulic pump selection: 1 according to the operating condition, power size, working environment and hydraulic system to the pump performance requirements, the type of hydraulic pump is determined. Hydraulic performance includes flow, pressure pulse performance, resistance to shock resistance, sensitivity to oil pollution, self-absorption performance and noise. The main parameters of hydraulic pump are determined according to the requirements of hydraulic system. Finally select the type of hydraulic pump. Common failure of hydraulic pump The 1 axis does not rotate 2 noise 3, the 4 hydraulic pressure less than 5 pressure and the flow rate unstable 6 abnormal fever 7 oil seal oil leak