Wiper Seals are a type of mechanical seal commonly used to protect piston rods and pistons in hydraulic and pneumatic equipment. The main function of Wiper Seals is to prevent dust, dirt, and other impurities from entering the interior of the equipment, thereby protecting the sealing performance of the piston rod and piston, and extending the service life of the equipment.
Wiper Seals are typically made of elastic materials such as polyurethane, nitrile rubber, fluororubber, etc. These materials have excellent wear resistance and chemical resistance, and can maintain stable performance in various harsh environments.
Wiper Seals are typically divided into two types: unidirectional and bidirectional. Unidirectional Wiper Seals can only prevent dirt and impurities from entering the device from one direction, while bidirectional Wiper Seals can simultaneously prevent dirt and impurities from entering the device from both directions.
Wiper Seals can also be customized according to different application requirements. For example, for high-speed rotating devices, special Wiper Seals can be used to ensure that they do not generate excessive heat and friction during high-speed rotation. For equipment used in harsh environments, special materials such as corrosion-resistant, high-temperature resistant, and low-temperature resistant Wiper Seals can be used.
In summary, Wiper Seals are in dispensable mechanical seals in hydraulic and pneumatic equipment, and their excellent performance and reliable sealing performance provide important guarantees for the normal operation of the equipment. If you need a Wiper Seals product, you can contact a professional seal manufacturer to customize the appropriate Wiper Seals for your device according to your specific needs.
Wiper Ring,Hydraulic Wiper Seal,Double Lipped Wipers,Dust Seals DG Zhongxingshun Sealing Products Factory , https://www.zxs-seal.com
(1) When laid directly, the cable is restricted by the surrounding soil, and the entire cable cannot be displaced. As a result, the core will generate large thrusts at both ends of the line under the effect of thermomechanical forces, causing displacement of the end. As a result, the safety of the cable attachment poses a great threat.
(2) When the pipe is laid, the cable will not be laterally constrained. Under the effect of thermo-mechanical force, the cable will be bent and deformed. With the constant change of the cable temperature, the bending deformation will occur repeatedly, causing fatigue strain on the metal sheath of the cable.
(3) When laying the tunnel, the cables are generally placed on the bracket and are not rigidly fixed. Therefore, the thermal expansion of the cable is large, and slipping occurs easily when the cable is laid on the inclined plane; serious displacement occurs easily at the bent position of the cable; the cable follows the cable. Constant changes in temperature, but also repeated bending deformation, so that the cable metal sheath fatigue strain.
(4) When the shaft is laid, the weight of the cable and the thermomechanical force may cause excessive strain on the metal sheath, thereby shortening the service life of the cable.
(5) When the municipal bridge is laid, if the cable is laid in the inner pipe of the bridge, the same problem as the laying of the pipe exists; if the cable is laid in the box girder of the bridge, the same problem as the laying of the tunnel exists, except for the laying of the The cables on the bridge will also be affected by the expansion and contraction of the bridge, which will accelerate the damage of the metal sheath of the cable.
The corresponding countermeasures for the above hazards must be taken from the aspects of the design and production of cables and accessories, cable circuit design and construction.
(1) Cables and accessories. In order to reduce the thermal expansion of large-section cables, split conductors should be used for the cable cores, which can not only reduce the loss of the cores, but also generate smaller thermo-mechanical forces per unit area than other forms. The cable accessory design must consider that it can withstand the thermomechanical forces of the cable without damage.
(2) There are two types of cable sheathing: aluminum sheath and aluminum alloy sheath. Their properties are quite different: Aluminum sheath can improve the running performance of the cable compared with the aluminum alloy sheath. High engineering, general cable metal jacket to choose aluminum jacket is appropriate.
(3) Directly laid cables can be laid in the serpentine shape near the terminal, such as the substation cable layer, to absorb deformation and reduce the end thrust: they should be rigidly fixed at the bracket to prevent the terminal from being damaged due to cable displacement. .
(4) When laying large-section cable in the row pipe, to prevent the cable from being bent and deformed, bentonite can be filled into the pipe lined with the cable. The work pipe outlet can be disturbed and fixed at the outlet of the pipe. The two sides of the cable connector must be rigidly fixed to protect the safety of the cable connector.
(5) The cable in the tunnel can be laid in a serpentine shape to absorb the deformation caused by thermo-mechanical forces. The cable must be fixed when laying on the slope, and the cables on both sides of the joint must also be rigidly fixed to protect the safety of the cable joint.
(6) The large cross-section cable in the shaft can be serpentine-shaped by means of a clamp head, and can be suspended at the top of the shaft to absorb the deformation caused by thermo-mechanical forces.
(7) Aluminium sheathing must be used for cables laid on municipal bridges to reduce the fatigue strain caused by bridge vibrations on the metal sheathing of cables. The laying method can refer to pipe or tunnels. It should be noted that while considering the thermal expansion of cables, It is also necessary to consider the expansion and contraction of the bridge. Flexible expansion must be taken at the expansion joints of bridges and bridges at the upper and lower levels, or a flexible rack that allows the cable to flex freely can be used.
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How to solve the thermal expansion of mine cable?
The threat of safe operation caused by cable thermal expansion under various laying methods: