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Service quality wins customer satisfaction
How to install and use hydraulic oil pipes correctly?
Release time:
2022-07-20 15:11
The hydraulic oil pipe is the blood vessel of the hydraulic system and is responsible for delivering hydraulic oil to the designated working mechanism. Improper installation of oil pipes will not only bring trouble to maintenance, but also cause excessive pressure loss, noise and other undesirable phenomena, and even cause "hemiplegia" and "complete paralysis" of the hydraulic system.
First, the principle of hard pipe installation and layout
1. When arranging the pipeline, try to keep the pipeline away from the parts that need frequent maintenance.
2. In order to facilitate maintenance, the hydraulic pipeline should be painted with different colors according to different pressures.
3. There should be at least one pipe in the pipe section between the two fixed points to accommodate thermal expansion and contraction, and try to avoid tight straight pipe connections. It is difficult to disassemble and assemble the straight pipe, and the pipeline will generate serious tensile pressure during work, which will easily lead to damage to the pipe joint.
4. When configuring pipelines, it is necessary to consider clean and beautiful, easy to maintain. The pipes are preferably arranged in parallel with less crossing. Or there should be a gap of at least 10mm between the parallel and intersecting pipes to prevent the pipes from contacting each other and cause vibration, and leave enough space to install the pipe head.
5. The bending radius should usually be determined according to the outer diameter of the hard pipe, and the bending radius should be greater than 3 times the diameter of the hard pipe.
6. The pipe length should be as short as possible to reduce pressure loss, time delay and vibration. The main failure mode of hard pipe is fatigue failure caused by mechanical vibration, so when the pipe is long, it needs to be supported by pipe clamps. The distance between the brackets varies with the outer diameter of the pipe, and is generally selected within the range of 0.4~1m. After adding the support of the pipe clamp, it can not only buffer the vibration, but also reduce the noise. In pipes with bends, the straight pipe sections at both ends of the bend should be fixed with support pipe clips, and when connecting with hoses, the hard pipe sections should be supported by pipe clamps.
Second, the principle of hose installation and layout
1. When installing the hose, various joint elements should be used correctly to avoid excessive bending of the hose. The hose must not be subjected to axial forces that could damage the connection between the hose and the fitting. Appropriate accessories and connectors should be used correctly to avoid additional stress. Avoid S-bends when laying out, as S-shaped installations can cause excessive movement of the hose, increasing local pressure loss and reducing its service life.
2. The length of the hose at the beginning of bending should be 1.5 times the diameter D; the bending radius of the hose in use should be greater than or equal to the minimum allowable bending radius of the hose, and generally should not be less than 10 times the outer diameter of the hose.
3. The length of the hose connecting the moving parts shall not exceed the minimum radius allowed within its total range of motion, and the hose shall not be subject to tensile stress.
4. Do not twist the hose when the parts connected to the hose move relative to each other. Therefore, the part can only bend in the same plane as it moves. This can be achieved by changing the angle of the pipe joint.
5. When the hose is bent in different planes, usually use a longer hose, and add a pipe clamp at the transition plane to fix the hose. In fact, the pipe clamp divides the hose into two sections, and each section bends in its own plane without twisting. If twisting of the hose cannot be avoided in practice, the hose should be loosened as much as possible.
3. Precautions for hose installation
1. It is strictly forbidden to reverse the phenomenon. When the hose is installed, the tensile stress should disappear after its own weight in the working state (no installation stress will be generated).
Anti-twist assembly skills: both ends are straight, first fix one end to a predetermined torque, then screw the other end in by hand, and screw it to the specified torque with a double-ended wrench; Gently bring the head nut into the thread, put the elbow end in the required position, tighten it with the specified torque, and use the double-ended wrench to screw the straight end to the specified torque;
2. The hose should be equipped with anti-mechanical devices as much as possible and should be installed according to its natural state to avoid sharp bends at the joints.
3. Proper use of accessories and connectors can avoid extra pressure on the hose.
4. Avoid external damage. External mechanical action on hoses, friction between hoses and components, and interactions between hoses can be avoided by proper configuration and securing of hoses. For example, the outer tube is protected by a sheath and an anti-wear sheet is added.
5. Make sure the hose has enough slack and slack so that the hose can self-regulate when under pressure. If the hose is too short, it may cause the hose and fitting to fall off, or act on the fitting causing seal failure and metal wear.
6. The use of pipe clamps can increase the stability of pipe arrangement and avoid friction between pipes and equipment. However, the use of pipe clamps should not compromise the flexibility of the pipe during compression and movement.
7. A minimum bending radius should be considered in any connection form to prevent the hose from breaking due to fatigue effects during operation.
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