Selection and replacement technology of vertical injection molding machine hydraulic oil (two)

Date：2014/7/21 16:43:39

Hazards and controls three vertical injection molding machine hydraulic oil contamination
         3.1 pollution hazards
         Pollution is the hydraulic system oil is in some cases detrimental to system performance and life of the tainted dirt. Common forms of pollution have residual oil pollution own pollution, fuel tanks, tubing, components, intrusion contamination from the surrounding environment, the air, the maintenance component assembly and disassembly, as well as the system itself generates pollution. 90% of the vane pump failures are due to dirty oil caused. Filter blocked, causing difficulties pump suction intake air, noise; accelerated pump wear, resulting in leakage increased, resulting in lower volumetric efficiency of the pump, shortened component life, reduce oil output, leading to slow the actuator movement; card live or sliding spool valve wear parts, so that the valve failure, resulting in failure of the solenoid coil, and even cause accidents; accelerate seal damage; cause deterioration of the oil mixed with water.
         3.2 Pollution Control
         (1) the appropriate choice of filters is an important means to control pollution.
         The main role of the filter that filters the hydraulic oil is mixed with the impurities in the hydraulic system to filter impurities in the work is completed, to ensure clean hydraulic oil. Oil filter should be based on the technical requirements of the hydraulic system, according to filtering accuracy, flow capacity, operating pressure, fluid viscosity, temperature and other conditions to select models and require periodic inspection and cleaning.
         (2) to prevent dirt from outside intrusion.
         In the process of transportation and storage of different types of hydraulic oil should be stored separately in different clean container, and affix the seal, ready to store the date of record. Choice should be stored dry and ventilated shade and avoid direct sunlight or high temperatures caused by oxidative deterioration of hydraulic oil. Oil still the best place to buy the new few days, and then injected into the system through the oil filter.
         Hydraulic oil temperature (3) vertical injection molding machine control hydraulic system work.
         Hydraulic oil temperature is too high for hydraulics unfavorable, the high viscosity of the oil is not only dramatically changed the oil, and the oil will become stable at room temperature corrosive, accelerate oxidative deterioration, do not decompose beneficial ingredients used to shorten the life of hydraulic oil, and even excessive vaporization leaving the pump suction air, does not work. General hydraulic system operating temperature is best controlled at 65 e less.
         (4) the periodic inspection and replacement of hydraulic oil.
         At regular intervals, the system checks the oil sample analyzed the degree of pollution is in compliance with the requirements. If you do not meet the requirements, it must be replaced immediately. (5) whether the hydraulic fluid in use or storage, should prevent mixing of the water. Oil mixed with a certain amount of water will make the oil turns milky, serious or even unusable.
         3.3 vertical injection molding machine with a selection of filters
         Vertical injection molding machine oil in the oil filter to filter out contaminants are commonly used way to control oil pollution. Vertical injection molding machines are equipped with appropriate filters. When the oil filter failure or inability to restore function, should be promptly replaced. Select filters mainly consider filtering accuracy, flow capacity and pressure conditions. Oil particles of similar size with a gap of hydraulic components damaging, so the choice of precision hydraulic system oil filter should be less than the gap among the smallest movement of the various components of the gap size. The flow capacity of the oil filter system flows through the oil filter to determine the maximum flow. Typically, vertical injection molding machine oil filter after a period of use, the size of the filter holes become smaller, so reducing the flow through the oil filter, oil filter pressure drop increases. The magnitude of the pressure filter is generally 0101 ~ 011 MPa.
         4 vertical injection molding machine technology to replace the hydraulic oil
         4.1 vertical injection molding machine oil change steps and precautions
         (1) The hydraulic oil tank with oil change machine extraction, demolition tubing and various hydraulic cylinders, replacement of wearing seals, stringent cleaning tank and oil filter.
         (2) with a low viscosity hydraulic oil flushing, start the motor, low-speed test run.
         (3) Add a new hydraulic fluid to a predetermined position. Hydraulic oil into the front tank to be cleaned. Open the fuel tank cap, into the hydraulic oil until the oil level in the highest position of the table. After boot operation, note positive position. On a regular basis in the hydraulic oil sampling tests, under normal conditions of use, sampling once every six months. More than 80% capacity utilization equipment, sampling once every three months.
         Oil change indicator according to the hydraulic oil oil change, oil change should pay attention to:
         (1) Before replacing the hydraulic oil, hydraulic oil tank older to drain the entire system must first program to clean;
         (2) Replace the hydraulic oil system must comply with the requirement to use oil grades, and should have been tested for specification compliance;
         (3) new hydraulic oil into the tank after filtration, filtration accuracy of not less than the filtration system accuracy;
         (4) When refueling, note mouth drums, tank port, filters out the tubing clean.
         4.2 vertical injection molding machine hydraulic system to replace the hydraulic oil common faults and solutions
         Vertical injection molding machine used hydraulic components include: pump, motor oil; valve (check valve, valve, pressure valves, flow valves, proportional control valves, servo valves); hydraulic accessories such as accumulators, filters , blocking indicator, pressure switches, pressure gauges selection switch, pressure gauge valve, the oil cooler. Leakage of the hydraulic system, especially the high-pressure oil leak, will directly affect the machine work, such as mold is not in place, the injection pressure is inadequate. Special attention is to be a one-way valve vertical injection molding machine hydraulic systems requiring regular dismantling, because the one-way valves open and close frequently in high impact, collide with the valve spool, easily damage the sealing surface.
         As the hydraulic system failure is often not as straightforward mechanical failure, which caused difficulties for maintenance, but if we continue to routine maintenance, you can effectively prevent the occurrence of various failures to achieve a multiplier effect. Vertical injection molding machine hydraulic system is toward the high control accuracy, high sensitivity, low noise, energy saving, proportional, servo, computer program direction.
         Features vertical injection molding machine hydraulic control system: strict work as a pilot program; each injection cycle pressure and flow system is based on process requirements change; injection procedure required when maximum power.
         5 Conclusions
         (1) different varieties, different brands of hydraulic oil may not mix, before adding new oil and after use, should be carried out sampling tests to ensure oil quality.
         (2) work with particular attention to the oil spill problem, the oil spill would adversely affect the work, causing environmental pollution and energy losses.
         (3) strict control of the hydraulic oil temperature.
         (4) the timely elimination of leakage in the system.
         (5) regular cleaning of hydraulic system components.

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