The various energy losses of the hydraulic control system will inevitably develop to bring about temperature rise and heat. A machine that uses liquid static pressure to use liquid as the working medium and is made according to PASCAL's principle for transferring energy to process metal, plastic, rubber, wood, powder and other products. The single column hydraulic press is generally composed of three parts: the machine (main engine), power system and hydraulic control system. Hydraulic press classification valve hydraulic press, liquid hydraulic press, engineering hydraulic press. The role of the working medium used in the precision hydraulic press is not only to transfer pressure, but also to ensure that the working parts of the machine are sensitive, reliable, long life and less leakage. 300 tons hydraulic press A machine that uses hydrostatic pressure to process metal, plastic, rubber, wood, powder and other products. It is often used in pressing processes and pressing forming processes, such as: forging, stamping, cold extrusion, straightening, bending, flanging, sheet drawing, powder metallurgy, pressing and so on.
According to conservation of energy
The design structure of the hydraulic control system is unreasonable, resulting in congenital deficiencies:
a. The design capacity of the fuel tank is too small, the cooling and cooling area is not enough, and the oil cooling is not designed to be installed
The capacity of the device or the cooling device having a cooling device is too small.
The selected valve component specifications are too small, resulting in large valve flow, increased pressure loss, resulting in hair.
For example, if the specification of the reversing valve is selected only according to the pump flow in the differential loop, this situation will occur.
c. According to the fast forward speed, you can choose a hydraulic pump market capacity of the quantitative pump oil supply control system, in the process will be large.
Part of the excess flow overflows from the safety valve at high pressure (feed pressure) and heats up.
The unloading circuit was not designed in system d. When the hydraulic pump stops working, the pump does not unload and the pump flows completely
When there is a discharge loop but no discharge loop, the volume overflows at high pressure, resulting in overflow loss and heating, resulting in an increase in temperature.
It can be unloaded.
e. The back pressure of the hydraulic control system is too high, for example in circuits using electro-hydraulic directional valves, in order to be able to ensure.
Its reversing reliability, when the valve does not work (medium) must also ensure that the system has a certain back pressure to ensure the existence.
A certain control pressure makes the electro-hydraulic valve reliably reverse, if the system flow is large, then these flows will be in
The control pressure overflows from the relief valve, causing the temperature to rise (as in the B690 planer).
f. The system pipeline is too thin, too long, too much bending, local environmental pressure loss and huge loss of pressure along the way,
The system efficiency is low.
The heat dissipation condition of closed hydraulic system is poor.
3 Heat caused by temperature rise in processing and use.
A. The machining accuracy and assembly quality of the parts are poor, and the mechanical friction between the relative moving parts is lost
Miss big.
The working gap of B-matching is not too large, or the cell gap is too large after wear during use, and the internal and external leakage
Large volume, resulting in large volume loss, such as the volumetric efficiency of the pump is reduced, and the temperature is rising rapidly.
The working pressure of the hydraulic system is inappropriate, higher than the actual need, sometimes due to seal adjustment
Over-tight or damaged seals increase the risk of leakage and have to adjust the pressure management to improve the work.
d The temperature of the surrounding living environment is high, and the heat generated during the management of hydraulic equipment causes the oil temperature to rise
The machine is working too long.
e 'oil viscosity is improperly selected, high viscosity leads to high viscosity resistance, and low viscosity leads to increased leakage.
Both of these conditions lead to increased body temperature and fever.
