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What are the requirements for piping when installing hydraulic hose joints?
Upload Time:
2022-06-15
Hydraulic hose joints should be selected according to the working pressure of the system software and the application site. Be sure to pay attention to whether the hardness of the hydraulic hose joint is sufficient, whether the pipe diameter and wall thickness meet the requirements of the drawing, and the inner cavity of the seamless pipe used must be bright, free of rust, no oxide skin, no jacket and other defects.
Hydraulic hose joints should be selected according to the working pressure of the system software and the application site. Be sure to pay attention to whether the hardness of the hydraulic hose joint is sufficient, whether the pipe diameter and wall thickness meet the requirements of the drawing, and the inner cavity of the seamless pipe used must be bright, free of rust, no oxide skin, no jacket and other defects. Hydraulic hose joints cannot be used if the following conditions are seen: The inner and outer walls of the hydraulic hose joints have been seriously rusted; the depth of the scratches on the pipe body is more than 10% of the wall thickness; the surface of the hydraulic hose joints is concave up to 20% of the pipe diameter The above; the wall of the pipe section is too thick and uneven, and the oval degree is more significant.
Hydraulic hose joints generally use seamless pipes, which are widely used in hydraulic transmission systems because of their advantages such as high hardness, low price, and easy connection without leakage. Generally, the hydraulic transmission system often uses cold-drawn high carbon steel No. 10, 15, and 20 seamless steel pipes. This steel type pipeline can be reliably welded with various standard pipes. Hydraulic hose joints, hydraulic press servo control systems and airline hydraulic transmission systems often use ordinary stainless steel pipes, which are corrosion-resistant, smooth inside and outside surfaces, and have relatively accurate specifications, but the price is high. The low-voltage system software of hydraulic hose joints can also choose copper pipes, aluminum pipes, nylon hoses and other pipe fittings, which are easy to bend to bring convenience to the pipeline, and are also selected by some low-voltage system software.
Production and processing of hydraulic hose joints. The processing of hydraulic hose joints includes laser cutting, welding seams, elbows, etc. The quality of the production and processing of hydraulic hose joints is relatively harmful to the main parameters of the pipeline system software, and is related to whether the hydraulic transmission system can operate reliably. Therefore, it is necessary to choose scientific, reasonable and effective production methods to ensure the quality of production and processing.
1. Laser cutting of hydraulic hose joints For the cutting of hydraulic hose joints, the equipment is used for laser cutting under normal circumstances, such as automatic cutting machines, bed or special equipment, etc. It is forbidden to use manual arc welding and O2 laser cutting methods, and it is allowed when there is no reason. Laser cut with handcraft saw. The inner hole and radial axis of the hydraulic hose joint after cutting should be kept as vertical as possible, and the deviation should be controlled at 90°±0.5°. Sharp edges need to be blunted and iron pins eliminated after laser cutting.
2. Bending of hydraulic hose joints The bending production and processing of hydraulic hose joints are preferably carried out on mechanical equipment or pipe bending machines. Using a CNC pipe bender to bend in cold conditions can prevent the formation of oxide skin and endanger the quality of hydraulic hose joints. If there is no cold bending equipment, the hot bending method can also be used, which is prone to deformation, thinning of the wall thickness and oxide skin during hot bending. Before the hot bending machine, it is necessary to fill the pipe with dry machine-made sand, close the branch pipe with bottle stopper, and use gas cutting or medium frequency induction heating method to heat the position to be bent. The heating length depends on the pipe length and bending angle.
3. When the hydraulic hose joints are rolled into 30°, 45°, 60° and 90°, the heating length is 60mm, 100mm, 120mm, and 160mm respectively; for the hydraulic hose joints with bending diameters of 34mm and 42mm, the heating length needs to be It is 25-35mm higher than the above specifications. The hydraulic hose joints after the hot bending machine need to be cleaned and the organic chemical pickling passivation method should be used to eliminate the oxide scale. Bending hydraulic hose fittings should take into account the bend radius. When the bending radius exceeds an hour, it will cause pipe stress and reduce the compressive strength of the pipe. Table 23.13-1 obtains less bending radius of seamless steel pipe
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