The reason why the hydraulic system is too high in the injection molding machine, EXTRUDER for PVC cable and processing method

Date:2022-7-19 Author:Sam

Reasons for the hem temperature of the injection molding machine
(1) The volume of the fuel tank is too small, the heat dissipation area is insufficient, but the cooling device is too small
(2) to select the quantitative pump oil supply system at the fast -forward speed. At work, most of the excess flow will be overflowed from the overflow valve under high pressure.
(3) In the system, there is a failure of the load load circuit or the oil pump cannot be unloaded due to the unloading load circuit. The entire traffic of the pump is overflowing under high pressure, resulting in the heating of the overflow loss, resulting in temperature rise.
(4) The system is too long, too much, too much, and local pressure loss and a lot of pressure loss.
(5) Insufficient component accuracy and poor assembly quality, relatively large mechanical friction loss during the motion.
(6) The cooperative gap between the component is too small, or the gap is too large after wear, the internal and external leaks are large, resulting in a large volume loss.
(7) The pressure adjustment of the hydraulic system requires much higher than the actual. Sometimes it is necessary to increase the pressure due to the tight sealing or the damage and leakage of the sealing parts.
(8) The temperature of Qi Hou and the operating environment is high, resulting in an increased oil temperature.
(9) The viscosity of the oil is improper, the viscosity resistance is large, and the viscosity is too small.
The harm of the injection molding machine \u0026 nbsp; the high temperature rise
(1) the thermal deformation of the mechanical produces thermal deformation, and the motion components with different thermal expansion coefficients in the hydraulic component are stuck due to the small gaps, causing the movement failure, affecting the impact The transmission accuracy of the hydraulic system causes poor work quality.
(2) Reduce the viscosity of oil and increase leakage. The volume efficiency of the pump and the efficiency of the entire system will be significantly reduced. Due to the decrease in the viscosity of the oil, the oil membrane of the mobile parts such as the slide valve becomes thinner and cut off, and the friction resistance increases, resulting in increased wear.
(3) Deformation of rubber sealing parts, accelerating aging failure, reducing sealing performance and service life, causing leakage.
(4) Accelerate oxidation of oil oxidation and deteriorate, and precious asphalt substances reduce the service life of hydraulic oil. The precipitating object is blocked by the horn and gap type valve port, causing the pressure valve card to be killed without action, the metal pipeline is elongated and the curved, and even the rupture.
(5) Reduce the air separation pressure of the oil, dissolve the air in the oil, and generate air points, resulting in a reduction in the performance of the hydraulic system.
Injection molding machine \u0026 nbsp; High temperature rise processing method
(1) According to different load requirements, regular inspections and adjustment of the pressure of overflow valve to make it just right.
(2) Reasonable selection of hydraulic oil, especially oil viscosity. Under the condition of conditions permit, try to use lower viscosity to reduce viscosity friction loss.
(3) Improve the lubrication conditions of exercise parts to reduce friction loss, which is conducive to reducing working load and reducing fever. ‘‘ ‘
(4) Improve the assembly quality and accuracy of hydraulic elements and hydraulic systems, strict Pelletizing Line Control the component gap and improve lubrication conditions.The sealing materials with small friction coefficients and improved sealing structures are used to reduce the starting power of the hydraulic cylinder as much as possible to reduce the heat generated by the loss of mechanical friction.
(5) Cooling device is added to the necessary time