This article mainly introduces:

Switzerland hydraulic cylinder,supporting cylinder manufacturer,supporting cylinder

(Switzerland supporting cylinder,produced by Hengyu Hydraulic Co., Ltd）

supporting cylinder are widely used in Switzerland，because of no need for deceleration device，no transmission clearance，excellent temperature resistance.So our company has designed supporting cylinder for customers from Switzerland.

Introduction to supporting cylinder:

The pressure, temperature, medium and speed of different types of seals are not the same, water-ethylene glycol medium (HFC) can not be sealed with polyurethane, it can only use rubber seal; When the supporting cylinder is running fast, it must be sealed with slip ring, such as Sterseal, Glairing, GD1000K, TDI, etc., when the running speed is slow, Yx, U, V combination seals can be used; Fluorine rubber seal is used in high temperature and high pressure environment; When the running speed is fast, the buffer sleeve and buffer valve must be considered.

When installing the supporting cylinder, the axial ends of the supporting cylinder cannot be fixed. Due to the effect of liquid pressure and thermal expansion in the supporting cylinder, there is axial expansion. If the two ends of the supporting cylinder are fixed, all parts of the supporting cylinder will be deformed. When disassembling the supporting cylinder, it is strictly forbidden to hammer the supporting cylinder and the piston surface, such as the supporting cylinder hole and the piston surface is damaged, do not allow sandpaper grinding, to use a fine oil stone carefully grinding. The clearance between the guide sleeve and the piston rod should meet the requirements.

The internal leakage of the supporting cylinder should be prevented when the supporting cylinder is used. The internal leakage of supporting cylinder includes the leakage caused by excessive wear of supporting cylinder block seal, piston rod and seal cover seal and piston seal. The cause of sealing leakage between the piston rod and the seal cover is that the seal is wrinkled, squeezed, torn, worn, aging, deterioration, deformation, etc., and a new seal should be replaced at this time.

If the seal of the supporting cylinder is abnormal wear, you can check whether the speed control valve is improperly adjusted, resulting in too high back pressure and improper installation of the seal or hydraulic oil contamination. The second is whether there is a foreign body entering the assembly and the quality of the sealing material is not good. The result is that the action is slow and weak, and in serious cases, it will cause damage to the piston and supporting cylinder, and the phenomenon of "pulling the supporting cylinder" appears. The treatment method is to adjust the speed control valve, and the necessary operation and improvement should be done according to the installation instructions.

Answers to some questions about supporting cylinder:

What is hydraulic cylinder internal leakage and external leakage?
The internal leakage of the hydraulic cylinder refers to the leakage of the piston head seal of the double-acting cylinder, and the leakage occurs inside the cylinder; The external leakage refers to the leakage phenomenon between the cylinder head (or cylinder guide sleeve) and the plunger rod (or piston rod) and the seal between the guide sleeve and the cylinder block, and the oil in the hydraulic cylinder leaks to the outside.

Why is the hydraulic cylinder of the larger excavator arm upside down?
The weight of the excavating arm of a large excavator will be very heavy, and an oil cylinder has two cavities, one is a rod cavity, and the other is a rodless cavity. The lifting force of the excavator is the product of the ortho-projection area of the piston rod cavity by the oil pressure, so the strength of the rodless cavity is much greater than that of the rod cavity. And the parallel bars with the piston rod facing down are also conducive to assembly and future maintenance. So a large excavator has to keep the cylinder facing down.