What is the reason for the hydraulic failure of the vertical injection molding machine

Vertical injection molding machine is a type of injection molding machine, which has three types: vertical, horizontal, and fully electric. Vertical injection molding machine is composed of injection molding system, clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc. The main purpose of use is to inject molten plastic into the mold through screws, maintaining the shape of the solution in the injection mold cavity. The function of the hydraulic transmission system of the hydraulic system is to provide power for various actions required by the injection molding machine according to the process requirements, and to meet the requirements of pressure, speed, temperature, etc. for various parts of the injection molding machine. If there is a malfunction in the hydraulic system, it will affect the power supply. So what is the reason for the malfunction? Let's explore below.
1、 Hydraulic oil contamination:
(1) Air mixed in the oil. Mainly due to poor sealing of pipe joints, hydraulic pumps, hydraulic cylinders, etc. There are bubbles on the fuel tank now.
(2) Mix water in the oil. It will make the oil turn milky white. Mainly due to cooler leakage or humid environment.
(3) Solid impurities are mixed in the oil. Mainly chips, welding slag, rust flakes, and metal powder.
(4) Gum like substances are produced in oil. The main banquet is when the sealing element is corroded or deformed by oil, resulting in the production of gelatinous substances in the oil, which often cause small pores to block.
2、 What is the effect of temperature on the viscosity of hydraulic oil
The effect of formation: As the temperature increases, the viscosity of the oil decreases. The change in oil viscosity directly affects the performance and leakage of the hydraulic system. (Normal temperature is between 30~50 ℃)
3、 Crawling fault:
Reason for occurrence: (1) Poor lubrication conditions. A 'pause slide pause' appears. Increase the amount of lubrication.
(2) Immerse air in the hydraulic system. Need to exhaust.
(3) Mechanical rigidity reasons. The wear and deformation of the parts cause changes in friction force, resulting in crawling. Replace parts.
4、 After starting production for a period of time, the oil pump sounds.
Treatment method: (1) The quality of the suction tube is poor or the throat code is not tightened. Remove the filter screen and check for deformation. Is the suction pipe layered. Replace the oil pipe and filter screen.
(2) The filter screen is not clean. Is there too much impurities in the hydraulic oil. Clean the filter screen.
(3) Oil pump wear: Check the wear of the oil distribution plate and rotor end face of the oil pump. Replace the oil pump.
5、 After the motor starts, the pressure gauge has pressure but no flow.
Solution: (1) If the DA board is damaged, repair the DA board.
(2) The overflow valve is stuck. Remove the overflow valve for inspection, clean the overflow valve or replace the pressure gauge for inspection.
6、 No pressure flow rate
(1) Check if the rotation direction of the motor and oil pump is normal.
(2) Check for oil leaks.
(3) Check the pressure flow valve for current.
(4) Can the pressure valve core be pressurized, replaced or cleaned with an inner hexagonal socket.