Hydraulic "fever" clever solution

Running longer, the equipment will be hot, but if the equipment continues high temperature, it is not normal. Hydraulic system heating is a common phenomenon, when the hydraulic system heating, the equipment will cause stiff operation, slow, weak, discontinuous and other issues.

Symptomatic treatment can be a good solution to the problem of hydraulic heating.

A summary of the causes of fever:

1. according to the fast speed to select the pump capacity of the quantitative pump oil supply system, at work, most of the excess flow will overflow from the overflow valve at high pressure and heat.

2. pipeline or bending is too long, too much, the local pressure loss and pressure loss along the way.

The 3. component is not accurate enough and the assembly quality is poor, and the mechanical friction loss between the relative motion is large.

4. hydraulic system work pressure adjustment is higher than the actual need. Sometimes because of tight seal, or because of seal damage, leakage increase and have to adjust the pressure to work.

5. tank volume is too small, heat dissipation area is not enough, not equipped with oil cooling device, or although there is cooling device, but its capacity is too small.

6. the unloading circuit in the system is out of order or the unloading circuit is not set. When the pump stops working, the oil pump can not be unloaded. The whole flow of the pump overflows under high pressure, resulting in overflow loss and heating, resulting in oil heating.

7., the fitting clearance is too small, or the use of wear, resulting in excessive clearance, leakage inside and outside large, resulting in large volume loss, such as the volume efficiency of the pump reduced, fast heating.

8. climate and operating environment temperature is high, resulting in oil temperature rise.

9., the choice of oil viscosity is improper, viscosity, viscosity resistance, viscosity is too small, leakage increases, the two circumstances can cause oil heating.

Two, the harm of too high temperature

1., the viscosity of the oil decreases, leakage increases, the volume efficiency of the pump and the efficiency of the entire system will be significantly reduced. As the viscosity of the oil decreases, the oil film of the sliding parts such as the slide valve is thinned and cut, and the friction resistance increases, leading to the increase of wear.

2. make the machine produce thermal deformation, the hydraulic components in the thermal expansion coefficient of different moving parts because of its smaller clearance and jammed, causing movement failure, affect the transmission accuracy of the hydraulic system, resulting in poor quality of components work.

3. make rubber seal deformation, accelerated aging failure, reduce sealing performance and service life, resulting in leakage.

4. accelerate the oxidation of oil, and precipitation of asphalt material, reduce the service life of hydraulic oil. The precipitates clog the damping orifice and slit valve port, leading to the failure of the pressure valve, the elongation of the metal pipe, the bending of the valve, and even the rupture of the valve.

5., the air separation pressure of oil decreases, the dissolved air in oil escapes, resulting in cavitation, resulting in lower hydraulic system performance.

Three, prevention and control measures

1. reasonable choice of hydraulic oil, especially oil viscosity, under the conditions permit, as far as possible to use a lower viscosity to reduce viscosity loss of friction.

2. according to different load requirements, often check and adjust the relief valve pressure, so that it is just right.

3. improve the assembly quality and accuracy of the hydraulic components and hydraulic system, strictly control the fitting clearance and improve the lubrication conditions of the fitting parts. The friction coefficient of small sealing material and improved sealing structure, as far as possible to reduce the starting force of hydraulic cylinder, in order to reduce the mechanical friction loss generated by heat.

4. improve the lubrication condition of the moving parts, reduce the friction loss, reduce the work load and reduce the fever.

5. add necessary cooling device.

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