Analysis and treatment of high injection oil temperature

 Injection moulding machine hydraulic system temperature rise is too high is the injection moulding machine in the use of one of the most common abnormal phenomenon, the following is about the injection moulding machine temperature rise is too high reason analysis and treatment method.

(1) The volume of the oil tank is too small, the heat dissipation area is not enough, cooling device, but its capacity is too small.

(2) The quantitative pump oil supply system, which selects the oil pump capacity according to the fast forward speed, there will be most of the excess flow in the work under high pressure to overflow back from the relief valve and heat up.

(3) the system discharge circuit failure or because of the discharge circuit is not set, stop the work of the oil pump can not discharge, the pump's total flow in the high-pressure overflow, resulting in overflow loss and heat, resulting in temperature rise.

(4) The system pipe is too thin and too long, too much bending, local pressure loss and large pressure loss along the way.

(5) Component precision and assembly quality is not enough, the relative movement of mechanical friction between the loss is large.

(6) the fitting gap of the mating parts is too small, or the use of wear and tear leads to excessive gap, internal and external leakage, resulting in large volume loss, such as the pump's volumetric efficiency is reduced, the temperature rises rapidly.

(7) hydraulic system operating pressure is set much higher than the actual need. Sometimes because the seal is too tight or because the seal is damaged, leakage increases and the pressure has to be adjusted to work.

(8) High air and operating temperature, resulting in high oil temperature.

(9) Select the fluid viscosity is not appropriate, viscosity viscous resistance, viscosity is too small, the leakage increases, both cases can cause heating temperature rise.

The harm of excessive temperature rise of injection oil 

(1) so that mechanical thermal deformation, hydraulic components in the thermal expansion coefficient of different moving parts due to their fit gap will be small and card, causing action failure, affecting the transmission accuracy of the hydraulic system, resulting in poor quality of work of the components.

(2) so that the viscosity of the oil is reduced, the leakage increases, the volumetric efficiency of the pump and the efficiency of the whole system will be significantly reduced. As the viscosity of the oil is reduced, the slide valve and other moving parts of the oil film becomes thin and cut through, the frictional resistance increases, resulting in increased wear.

(3) make rubber seals deform, accelerate ageing failure, reduce sealing performance and service life, resulting in leakage.

(4) Accelerate the oxidation and deterioration of the fluid and the precipitation of asphalt, reducing the service life of the hydraulic fluid. Precipitated material blocking damping holes and slit valve port, resulting in pressure valve card ※ and can not act, metal pipeline elongation and bending dictionary, and even rupture.

(5) so that the air separation pressure of the oil to reduce the dissolved air in the oil to escape, resulting in air pockets, resulting in a reduction in the performance of the hydraulic system. daoben is a professional plastic injection molding machine manufacturer & supplier.

Injection molding machine oil temperature rises too high Treatment method

(1) According to different load requirements, frequently check and adjust the pressure of the pressure relief valve to make it just right.

(2) reasonable selection of hydraulic oil, especially the viscosity of the fluid, where conditions permit, try to use a lower viscosity to reduce viscosity friction loss.

(3) Improve the lubrication conditions of moving parts to reduce friction loss, which is conducive to reducing the work load, reduce heat.

(4) Improve the assembly quality of hydraulic components and hydraulic systems and their own accuracy, strict control of the fit gap and improve lubrication conditions. The use of small friction coefficient of sealing materials and improve the sealing structure, as far as possible to reduce the starting force of the hydraulic cylinder to reduce the mechanical friction loss of heat generated.

(5) If necessary, install additional cooling devices.