2022.12.03
1. The main parts and causes of foam machinery EPS equipment and foam machinery hydraulic system leakage can be summarized as follows:
1. Pipe joints and oil plugs, pipe joints, large EPS foam machinery, most of the oil leakage occurs on the connection parts of the manifold, valve bottom plate, tubular foam plastic machinery factory components and pipe joints. When the pipe joints are connected with metric threads, it will The combination gasket is not tightly sealed and leaks; when the taper pipe thread is connected, the screw thread and the screw plug cannot be completely matched, and oil leakage is easy. Once the above two situations occur, it is difficult to cure them, and the foam cutting machine can only be filled and sealed with the help of liquid sealant or polytetrafluoroethylene raw material tape.
2. Oil leakage between the joint surfaces of plate valves and stacked valves is mainly due to: collision with the O-ring installation surface, scratches, long installation screws, and insufficient strength, all of which will cause oil leakage. Solution: Deal with the above problems separately.
3. There are many reasons for the oil leakage of the hydraulic cylinder, such as the adhesion of dust and muddy water on the surface of the piston rod, salt spray, surface bumps, eccentric loads, etc., which will cause seal damage and failure to cause oil leakage. The solution is to try not to make the hydraulic cylinder bear partial load, wipe off the dust on the piston rod frequently, pay attention to avoid bumping and scratching, and do a good job in the cleanliness management of the hydraulic oil.
4. Temperature rise and heat will cause more serious leakage, which can reduce or deteriorate the oil viscosity and increase internal leakage; if the temperature continues to increase, it will cause the sealing material to expand after heating and increase friction, which will accelerate wear and axial rotation Or the sliding part will quickly leak. The expansion and deformation of the O-ring cause thermal aging, and it cannot return to its original shape after cooling, loses elasticity and fails, and gradually leaks. Suggestion: EPS foam machinery and equipment, foam machinery Regular inspection, regular maintenance, and timely treatment are the basic guarantees to prevent leakage and reduce failures.
2. Inspection and maintenance of EPS equipment, foam plastic machinery and hydraulic system
1. Precautions when overhauling the hydraulic system: When the EPS equipment and the foam plastic mechanical system are working, when the machine is shut down and the pressure is not released, and the control power supply is not cut off, it is forbidden to overhaul the system to prevent personal casualties…
2. Hydraulic transmission has many advantages such as simple structure, stable quality, high mechanical efficiency, and easy automation. Therefore, at present, many large and medium-sized machinery adopt hydraulic transmission systems, but hydraulic technology also has disadvantages such as oil leakage, oil temperature changes affecting the control of operating speed, and noise. How to make hydraulic machinery operate more safely and efficiently, correctly select hydraulic oil according to system pressure, operating speed, working oil volume, and ambient temperature, use and maintain it reasonably, maintain the excellent working performance of the oil for a long time, and perform better work Efficiency is the key to work. In view of this, it is necessary to operate according to the standard, manage scientifically, and take some preventive measures.
3. Prevent contamination and impurities from mixing into hydraulic oil
(1) Hydraulic oil and oil barrels should be installed in a clean and safe place, and management should be strengthened. The oil barrels, oil filter units, oil funnels, oil pipes, etc. used should be kept clean. The oil drums carrying hydraulic oil must be cleaned in advance, and the oil drums must be dedicated and not mixed with other oil drums.
(2) The hydraulic machinery should always be kept clean. In order to prevent dust and sundries from falling into the oil, the oil tank should be sealed with a cover.
(3) The oil in the oil tank should be replaced regularly according to the working conditions. When changing the oil, the dirt and impurities accumulated at the bottom of the fuel tank should be removed, and the fuel tank should be cleaned.
4. The simple identification methods of oil pollution degree are:
(1) Visual inspection. The limit of normal human vision is generally about 40 μm. Therefore, when the particle size of the dirt and impurities in the oil is greater than 40 μm, the human eyesight can see it. When the dirt can be directly observed by the eyesight, it means that the working oil is already very dirty and must be replaced.
(2) Test tube comparison. Use a test tube to compare the new oil with the used oil. If the used oil is found to be black in color and has a foul smell, it must be replaced. If the color does not change but becomes turbid, it means that the oil contains water. After clarification and removal of water, the oil can continue to be used. If the transparent color becomes lighter and there is no bad smell, it may be mixed with different oils, but it can continue to be used as long as the viscosity is appropriate.
(3) Take a drop of used oil and heat it, place it in the filter paper for testing, and let it drop down. If there are solid impurities, thin black spots will remain on the filter paper, which means that the oil contains more impurities and it is not suitable to continue. use.
(4) To find out whether the oil contains water, heat an iron plate to 250. At about C, drop a drop of oil on the iron plate, if there is a popping sound, it means that it contains water. Oil without water burns silently.
5. Prevent air from entering EPS equipment, foam plastic mechanical hydraulic system In order to prevent air from entering the hydraulic system, the following points should be paid attention to during use and maintenance:
(1) Check the oil level in the oil tank frequently to keep enough oil.
(2) During the working process, the oil will be lost, and new oil of the same specification must be replenished in time.
(3) Even when the oil level is low, the oil suction pipe 1:3 and the oil return pipe opening should be kept below the oil level.
(4) Seals with good performance should be used, and the failed sealing devices should be replaced in time, and the screws at the pipe joints and all joint surfaces should be tightened.
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