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Principle of lubricating hydraulic cylinder of hydraulic system:

The hydraulic cylinder is a hydraulic actuator which transforms the hydraulic energy into mechanical energy and makes linear reciprocating motion (or swing motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the decelerator can be avoided, there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of the cylinder barrel and the cylinder head, the piston and the piston rod, the sealing device, the buffer device and the exhaust device. Buffer device and exhaust device depend on the specific application, and other devices are indispensable.

Causes of leakage of hydraulic cylinder:

The so-called leakage is mainly under the pressure, through the capillary gap of the material, the leakage is relatively small, and the leakage is slow, so it is difficult to be found by the maintenance personnel, but its impact on the operation of the equipment is greater.

1. Leakage of piston rod and guide sleeve:

For the piston rod and guide sleeve in the hydraulic cylinder, it is the main reason for the leakage of the equipment. During the plating and soldering of the piston rod surface, the phenomenon of peeling will occur, and the problem of longitudinal stretch mark will occur seriously, thus the seal will fail, leaving the hidden danger of system leakage. Therefore, in the inspection of leakage, it is necessary to focus on the analysis of the surface roughness and geometrical tolerance of the piston rod. When the bending degree of the piston rod reaches the design standard, it needs to be manufactured by a professional manufacturer. When the piston rod is worn, the plating surface will be processed again. However, for some problems of hydraulic cylinder movement failure, it is necessary to combine the actual operation condition of the equipment to carry out seepage The analysis of leakage factors can improve the scientificity of leakage detection. Therefore, it can be found that the piston rod and guide sleeve are the main causes of leakage, which need to be paid attention to by relevant personnel.

2 seal leakage:

Piston seal is the main reason to prevent the internal leakage of hydraulic cylinder. In the inspection, it is necessary to focus on the analysis of lip seal, judge whether there is lip edge scar and damage problem, and focus on the inspection of the reassembled position, reasonably judge the inspection effect of the seal, so as to judge the leakage phenomenon through the analysis of the sealing problem. At the same time, in the analysis of piston rod sealing problems, there are problems of sealing parts and back-up rings damaged. Therefore, relevant inspectors need to select the appropriate structure and materials through the analysis of the sealing condition of hydraulic cylinder, reduce the occurrence of leakage phenomenon in a large limit, and find out the causes of leakage in time.

3 hydraulic cylinder leakage:

The surface of the cylinder and the sealing of the piston are the important causes of the internal leakage. When the longitudinal stretch mark occurs in the cylinder, the piston of the core needs to be replaced in time to ensure its sealing. In this kind of leakage monitoring, other faults can not be eliminated in time. Therefore, it is necessary to analyze and check the dimensional tolerance, geometrical tolerance, etc., and detect the problem of no longitudinal stretch mark. Through the comprehensive analysis of leakage causes, we can find solutions to solve the leakage problem of equipment system.

4. Problems of hydraulic cylinder itself:

Through the analysis of hydraulic cylinder penetration, we can find that there are two problems, which are usually reflected in the following two aspects:

First, there is residual air in the hydraulic cylinder of the hydraulic press. Under the background of working medium formation, elastomer often appears, so it is necessary to remove the existing air in time. When removing air, it is necessary to check whether the diameter of the suction pipe of the hydraulic pump is too small, and analyze the sealing state of the suction pipe joint to effectively prevent the occurrence of pump suction.

Second, the sealing friction is too large. In the detection of leakage problems, it is necessary to ensure the effectiveness of the matching between the piston rod and the guide sleeve, strictly control the dimensional tolerance, adjust the sealing friction, and make it in a proper state, and timely find out the wear and strain phenomenon of the sliding part of the hydraulic cylinder.