Hydraulic support in coal mining machinery support equipment in the mine, after overhaul generally used for five years, but
3 months hydraulic support a variety of hydraulic valve life is very low, long, short, only a few weeks, foreign
Solve the ways and means to increase the filtration accuracy of the system and improve the quality of the emulsion, but with little success. With
A hydraulic valve in the UK for example, although the accuracy of the machining accuracy and the entire hydraulic system filter is higher, but
Low life in our country to be phased out.
Early hydraulic support, no other sealing measures between the motion pairs, direct contact with metal seal, that is,
Require sealing contact plane consistent with high machining accuracy, it must increase the binding force of the sealing
, So that the contact surface is plastically deformed to plug the leak channel. A complete hydraulic system consists of five parts group
Into, namely, power components, actuators, control components, no pieces and hydraulic oil. The role of the power element is the original
Motif of the mechanical energy is converted into fluid pressure in the hydraulic system pump, the entire hydraulic system mention
For power. Hydraulic pump structure generally in the form of gear pumps, vane pumps and piston pumps.
The role of the actuators (such as hydraulic cylinders and hydraulic motors) is the pressure of the liquid can be converted into mechanical energy to drive
Dynamic load for linear reciprocating or rotary motion.
Control and regulation of the liquid pressure in the hydraulic system, flow and direction control element (i.e., the various hydraulic valves)
. According to the different control functions, hydraulic valves can be divided into the village force control valves, flow control valves and directional control valves.
The pressure control valve is divided into benefits flow valve (safety valve), pressure reducing valves, sequence valves, pressure relay; flow control
System valves including throttle valve, regulating valve, flow diversion valve; directional control valve includes a one-way valve, check valve,
Shuttle valve, valve.
Depending on the control mode, the hydraulic valves can be divided into the switch control valve, fixed value control valve proportional control valve
.
Auxiliary components including the fuel tank, oil filter, tubing and fittings, seals, pressure gauge, oil level, oil temperature meter
And so on. Hydraulic oil is the working medium in the hydraulic system to transfer energy, there are a variety of mineral oil, emulsion molding Hop
Hydraulic oil categories.
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