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Causes of failure of hydraulic part of hybrid injection molding machine

Mar 20, 2020

What are the causes of failure of the hydraulic part of the hybrid injection molding machine? Let us introduce you next.

(A): hydraulic oil pollution:

(1): Air mixed with oil. This is mainly due to the tightness of pipe joints, hydraulic pumps, hydraulic cylinders, etc. There are air bubbles in the fuel tank.

(2): Mix water in oil. Makes oil milky. The main reason is that the coolant is leaking water or a moist environment.

(3): The solid impurities are mixed in the oil. Mainly chips, welding slag, rust and metallic powder.

(4): A colloidal substance is produced in the oil. The main holiday is that the seals corrode with oil or damage the oil, so that a gelatinous substance is produced in the oil. This gel often causes clogging of the small holes.

(B): What is the effect of temperature on the viscosity of hydraulic oil:

Effects: 1): When the temperature increases, the viscosity of the oil decreases. Changes in oil viscosity directly affect the performance and leakage of hydraulic systems. (Normal temperature between 30 ~ 50 ℃)

(Three): Failed to crawl:


(1): Bad lubrication conditions. "Pause-Taxi-Pause" appears. Increase the amount of lubrication.

(2): Air immersion in the hydraulic system. Need to vent.

(3): The causes of mechanical rigidity. Parts wear and deformation, causing friction and creep changes. Replace the parts.

(C): After starting for a while, oil pump rang.

Processing method:

(1): The suction tube quality is not good or the throat symbol is not tight. Remove the filter and check for deformation. Whether the suction tube is stratified. Replace the oil pipe and filter.

(2): The filter is not clean. Excess impurities in the hydraulic oil. Clean the filter.

(3): Oil pump wear: Check the oil pump oil container and the rotor end face for wear. Replace the oil pump.

(5): After starting the engine, the pressure gauge has pressure and no flow.

Processing method:

(1): DA plate broken, fix the DA plate.

(2): The drain valve is stuck. Remove the drain valve for inspection, clean the drain valve or replace the pressure gauge for inspection.

6: No pressure flow

(1): Check if the direction of rotation of the engine oil pump is normal.

(2): Check the oil leak.

(3): Check the pressure flow valve of the current.

(4): Whether the inner hexagon is pressed to flip the pressure valve, whether it is pressed, replaced, or cleaned.