An outer sealing structure of a hydraulic cylinder

Abstract

The invention discloses an outer sealing structure of a hydraulic oil cylinder, which belongs to the field of oil cylinder sealing. During the moving process of the piston rod, the auxiliary sealing cover on the moving side end cover moves toward the ring body under the action of gradually increasing oil pressure, thereby squeezing Press the ring body to make it deform in the radial direction, thereby greatly increasing the contact area with the inner wall of the oil cylinder and improving the sealing effect. When the ring body ages, the toughness of the ring body becomes weaker. At this time, the moving span of the auxiliary cover becomes larger, and the ring The pressure deformation of the body changes greatly, and the contact area with the inner wall is larger, which can effectively compensate for the problem of poor sealing caused by aging, and effectively avoid the occurrence of external leakage; The force on the self-resetting connecting layer becomes smaller, and the hemispherical shape of the inner light becomes smaller, which leads to the obvious reduction of the data on the sensor, so that the staff can be warned at the early stage of the internal leakage to reduce the impact.

Description

technical field [0001] The invention relates to the field of oil cylinder sealing, and more particularly, to an outer sealing structure of a hydraulic oil cylinder. Background technique [0002] The seal is a mechanism that prevents the leakage of the working medium (internal leakage and external leakage) and prevents foreign objects (such as air, dust and water) from entering the hydraulic components and hydraulic system. [0003] In order to ensure that the hydraulic oil in the cylinder is not easy to leak out, a sealing ring is set outside the end cover, which is in extrusion contact with the inner wall of the cylinder and the surface of the end cover to achieve sealing. The sealing ring is prone to aging, causing its sealing performance to gradually weaken, resulting in external leakage; in addition, external leakage can be found with the naked eye, but when internal leakage occurs at the dynamic seal between the piston rod and the oil cylinder, in the prior art, general...

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Problems solved by technology

[0003] In order to ensure that the hydraulic oil in the cylinder is not easy to leak, a sealing ring is provided outside the end cover, which is in contact with the inner wall of the oil cylinder and the surface of the end cover to achieve sealing. The seal here is a static seal. However, when it is in the squeezed state for a long time, The sealing ring is prone to aging, which causes its sealing performance to gradually weaken, resulting in external leakage; in addition, external leakage can be found with the naked eye, but when internal leakage occurs at the dynamic seal between the piston rod and the cylinder, in the prior art, generally It is judged whether there is internal leakage by the change of oil temperature or its action. This method is generally found after a relatively long time after the occurrence of internal leakage. quality suffers

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