2022.06.15
First, the vacuum problem:
1.1 Is the hardware configuration of the system reasonable and how to solve it?
①Water temperature (20~30℃).
②The water should have a filter device.
③The vacuum pipeline must have a filter device.
④ A machine with at least 2.5 kilowatts.
1.2 What problems should be paid attention to in the daily maintenance and maintenance of the system?
①Check the water pump regularly.
② Regularly check the tightness of the valve.
③The pressure test of the cold shower should be conducted once every six months.
④ Check whether the water inlet of the pump and the cold shower is smooth.
1.3 What issues should equipment users pay attention to in production?
Vacuum is afraid of water, leakage and high temperature.
①Water: The less water in the suction port of the vacuum pump, the better.
②Leakage: The hardware configuration of the entire system should be free of leakage.
③High temperature: The lower the temperature of the suction port of the vacuum pump, the better.
Second, mold, gun maintenance:
What problems exist in the mold, and what problems should be paid attention to in daily maintenance?
①The spray has no dead ends.
②The wall thickness should be controlled at 0.7 cm.
③ The distance between the center of the air sieve and the air sieve is within 2.5 cm.
④ There must be a horn inlet on the reverse side of the air sieve.
⑤ The larger the flow rate of the steam inlet and the water outlet, the better.
2.2 What are the usual maintenance nodes and processes for the mold?
①Copper sleeves and new molds should be adjusted for flatness when they are bought.
② Check all screws and nuts for looseness.
③ Check the air sieve to see if there is any abnormality (clogging, shaking off).
2.3 What problems should be paid attention to in the maintenance of the feed gun, and where are the key nodes of maintenance?
①Whether the speed of switching the gun is smooth.
②Whether the feed pipe has water or blow-by gas.
Suggestion: do maintenance on the feed gun every two months, clean up the garbage inside, add a little light oil (transformer oil)
Third, the maintenance and maintenance of the molding machine:
3.1 What are the problems with the current equipment?
①Leakage: molds, pipes.
②The maintenance of the hydraulic system of the material gun is not in place.
③ Poor equipment hygiene.
3.2 What aspects should the equipment be maintained at ordinary times?
①The hydraulic oil is changed once a year.
②The guide post should not be short of oil. Clean the guide post before refueling.
③ Try not to contain water in the air, check the oil-water interface, and do it for drainage and refueling.
④ Regularly check all the hardware of the equipment to check whether there is any abnormal phenomenon.
4. Qualities that debugging personnel should have:
4.1 What technical and conceptual problems do the commissioners currently have?
(one)
①Lack of responsibility for the maintenance of the equipment: the normal and stable production of the equipment is the key.
②The understanding of vacuum is not enough, and high temperature demoulding cannot be achieved.
③ It is not known to use steam pressure adjustment for products with different product densities.
④The foam penetration pressure cannot be grasped. Different products have different requirements and different degrees of fusion.
(2) Concept
High degree of fusion: large flow, high temperature and high pressure foaming.
Solubility: large flow, high temperature and low pressure foaming.
4.2 How should the energy-saving machine be debugged and what is the concept?
①The steam pressure and the outer main pipeline reach 7-8 kg pressure.
②The pressure reducing valve should be adjusted to 4-5 kg for those with high degree of fusion; 2-2.5 kg for those with low degree of fusion. (Normal product control pressure: pressure gauge offline 0.3-0.4, online 0.5)
③Less water cooling, and it is best to control it in 0.5-2 seconds.
⑤ Try to reduce the water in the mold to the vacuum pipe.
idea:
Large flow and high temperature demoulding, the moisture content of the product is controlled at about 6-7%, and the negative pressure of the mold reaches 5 at the moment of vacuum cooling.
4.3 The training of commissioners?
①Internal training: regular technical personnel exchange, sum up experience, and share good debugging skills.
② External training: invite relevant technical personnel from outside to give lectures.
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