1. When the hydraulic cylinder of automatic feeding concrete mixer is assembled, the end cover is biased, and the piston rod and cylinder are not concentric, which makes it difficult for the piston rod to extend and accelerates the wear of the seal. It can be disassembled for inspection and reassembled.
2. Seal installation error: for example, the seal is installed wrong or missing.
① If the gland is not installed properly, it cannot be pressed tightly: for example, the gland is installed with deviation, the fastening screw is stressed unevenly, and the fastening screw is too long. The screws should be tightened in diagonal order, the force should be uniform when tightening the screws, and the screw length should be selected according to the depth of the screw hole.
②査密封件質量是否有問題：當反復更換新密封圈均解決不了 漏油問題時可能屬于這種情況。此時應確認密封圈是否購自非正規廠家的產品，密封材質尺寸是否有問題密封件是否保管不善自然老化 變質。
② Check whether there is a problem with the quality of the seal: this may be the case when the oil leakage can not be solved by repeatedly replacing the new seal ring. At this time, it should be confirmed whether the seal ring is purchased from the irregular manufacturer's products, whether there is a problem with the size of the seal material, and whether the seal is not properly kept and naturally aged.
③ Check whether the processing quality of the sealing part meets the requirements: if the groove size and accuracy do not meet the requirements, the sealing surface is rough, and there is no chamfer, the groove size shall be designed and processed according to the relevant standards. If the groove size does not meet the requirements, it shall be corrected to the required size, corrected and deburred.
④ Check the service conditions of the hydraulic cylinder seal of the automatic feeding concrete mixer: if the oil is not clean, the viscosity is too low, the oil temperature is too high, and the ambient temperature is too high, the appropriate clean oil shall be replaced, the cause of temperature rise shall be found out, and the measures such as heat insulation and oil cooling device shall be taken.
3. When selecting the hydraulic cylinder, according to the actual needs, after meeting the basic requirements of inner diameter, stroke, service pressure and installation form, special attention should be paid to:
① If the output speed of the hydraulic cylinder reaches a certain standard after bearing the load, the hydraulic cylinder with buffer device must be selected in order to reduce the hydraulic shock caused by the sudden stop in the high-speed movement of the hydraulic cylinder; Higher speed, but also in the hydraulic cylinder speed valve.
② For the hydraulic cylinder with stroke more than 100 mm, in order to prevent overload of piston rod and rapid wear of piston, support ring should be used.
③ Generally speaking, different hydraulic oils are suitable for oil seals of different materials. When selecting hydraulic oil or oil seal, attention should be paid to the relationship between sealing material, hydraulic oil and working temperature, so as to ensure the service life of hydraulic cylinder of automatic feeding concrete mixer.
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