A sealing protection device for self-lubricating bearings after installation

Abstract

A sealing protection device for a self-lubricating bearing after installation, comprising a tightening nut, a sealing chamber, a self-lubricating bearing and an actuator, wherein the self-lubricating bearing is wrapped in the sealing chamber after being installed on the actuator, and the sealing chamber is formed by a sealing end cover, an upper sealing member, a lower sealing member and a sealing core shaft that fit tightly together, specifically: the sealing core shaft is sealed with the sealing end cover after passing through the self-lubricating bearing and extends out of the sealing end cover; the tightening nut is installed on the sealing core shaft after extending out of the sealing end cover, and a nozzle for connecting to an air pump is provided on the top of the sealing core shaft; at the same time, an upper sealing member is provided between the sealing end cover and the self-lubricating bearing, and a lower sealing member is provided between the sealing core shaft and the self-lubricating bearing. The present invention has a simple structure and can solve the problem that it is difficult to protect the self-lubricating bearing after installation, which results in the inability to perform normal air tightness tests on actuator components using self-lubricating bearings.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing protection, and in particular to a sealing protection device for a self-lubricating bearing after installation. Background Art

[0002] Self-lubricating bearings are oil-free self-lubricating bearings with advantages such as high load capacity and strong impact resistance. They are particularly suitable for heavy loads, low speeds, reciprocating or swinging situations where lubrication and oil film formation are difficult. They are often selected as load-bearing joints on the retractable actuators of various aircraft.

[0003] However, since most self-lubricating bearings achieve oil-free self-lubrication by embedding composite fabric into the journal to reduce rotational friction, self-lubricating bearings generally have strict dust, water, and oil-proofing requirements to prevent contamination of the composite materials within the bearing. However, most retractable actuators undergo a sealing performance test before delivery. This involves placing the entire actuator in oil and filling the pipeline with gas at a certain pressure to observe whether bubbles are generated. To prevent oil contamination of the self-lubricating bearing during the sealing performance test, the traditional approach is to adjust the process sequence, first conducting a sealing test, and then performing bearing riveting after the test is passed. This results in the bearing riveting work, which should originally be performed on a single joint, being moved to the actuator assembly stage, significantly increasing the difficulty of bearing riveting and placing higher demands on equipment capabilities. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a sealing protection device for a self-lubricating bearing after installation, so as to solve the problems in the above-mentioned background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0006] A sealing protection device for a self-lubricating bearing after installation, comprising a tightening nut, a sealing chamber, a self-lubricating bearing, and an actuator, wherein the self-lubricating bearing is enclosed in the sealing chamber after being installed on the actuator, and the sealing chamber is formed by a sealing end cover, an upper sealing member, a lower sealing member, and a sealing core shaft in close contact; specifically:

[0007] The sealing core shaft passes through the self-lubricating bearing and is sealed with the sealing end cover, and extends out of the sealing end cover; the tightening nut is installed on the sealing core shaft after extending out of the sealing end cover, and a nozzle for connecting to the air pump is provided on the top of the sealing core shaft; at the same time, an upper seal is provided between the sealing end cover and the self-lubricating bearing, and a lower seal is provided between the sealing core shaft and the self-lubricating bearing.

[0008] In the present invention, an annular groove for mounting an annular sealing gasket is provided in the sealing end cover.

[0009] In the present invention, an air leakage hole is reserved on the sealing core shaft to ensure that the sealing cavity at the self-lubricating bearing can be communicated with the pipe nozzle.

[0010] In the present invention, both the upper sealing member and the lower sealing member are sealing gaskets.

[0011] In the present invention, the sealing core shaft includes a pipe nozzle, a sealing receiving cone, a bearing nest and a sealing support platform. The pipe nozzle is arranged at the top, the sealing receiving cone is arranged between the pipe nozzle and the bearing nest, the sealing support platform is arranged at the bottom of the bearing nest, and a nut is arranged at the bottom of the sealing support platform; the sealing receiving cone is used to install the sealing end cover, and the self-lubricating bearing is nested on the bearing nest; an upper concave ring is arranged between the sealing support platform and the bearing nest for installing an upper seal, and the diameter of the upper concave ring is smaller than the diameter of the sealing support platform and the bearing nest; a lower concave ring is arranged between the bearing nest and the sealing support platform for installing a lower seal, and the diameter of the lower concave ring is smaller than the diameter of the bearing nest and the sealing support platform. Through multiple seals, the self-lubricating bearing is protected from penetration and erosion by external oil.

[0012] In the present invention, the sealing core shaft includes a one-way inflation valve, a sealing receiving cone, a bearing nest and a sealing support. The one-way inflation valve is arranged at the top, the sealing receiving cone is arranged between the one-way inflation valve and the bearing nest, the sealing support is arranged at the bottom of the bearing nest, and a nut is arranged at the bottom of the sealing support; the sealing receiving cone is used to install the sealing end cover, and the self-lubricating bearing is nested on the bearing nest; an upper concave ring is arranged between the sealing support and the bearing nest for installing an upper seal, and the diameter of the upper concave ring is smaller than the diameter of the sealing support and the bearing nest; a lower concave ring is arranged between the bearing nest and the sealing support for installing a lower seal, and the diameter of the lower concave ring is smaller than the diameter of the bearing nest and the sealing support.

[0013] In the present invention, the working principle of the sealing protection device is as follows: after the sealing core shaft passes through the self-lubricating bearing, it is sealed with the sealing end cover through the annular sealing ring, and then the tightening nut is tightened. The sealing end cover, the upper seal, the lower seal and the sealing core shaft fit tightly together to form a complete sealed cavity to wrap the self-lubricating bearing inside. The sealed cavity is only connected to an external air pump through the nozzle on the sealing core shaft to assist in inflating the sealed cavity, thereby further protecting the self-lubricating bearing from being penetrated and corroded by external oil. Beneficial effects

[0014] 1) The present invention has a simple structure and can solve the problem of difficulty in protecting self-lubricating bearings after installation, which results in the inability to properly perform air tightness tests on actuator components using self-lubricating bearings.

[0015] 2) The present invention is simple to use. The sealing protection function can be achieved by assembling the device on the installed self-lubricating bearing;

[0016] 3) In the present invention, a complete sealed cavity is formed by tightly fitting the sealing end cover, the upper seal, the lower seal and the sealing core shaft, and the self-lubricating bearing is protected in the sealed cavity. At the same time, a nozzle is reserved on the sealing core shaft to further improve the anti-leakage performance by filling it with pressurized gas, thereby reducing the difficulty of riveting the self-lubricating bearing and the requirements for equipment capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an exploded view of a preferred embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the structure of a preferred embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional view of a preferred embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the use status of a preferred embodiment of the present invention.

[0021] Figure 5 This is a front view of a sealing core shaft according to a preferred embodiment of the present invention.

[0022] Figure 6 A side view of a sealing core shaft according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0024] See also Figures 1 to 6 A sealing protection device for a self-lubricating bearing after installation, comprising a tightening nut 1, a sealing end cover 2, an annular sealing gasket 3, an upper sealing gasket 4, a self-lubricating bearing 5, a lower sealing gasket 6, a sealing core shaft 7, a sealing cavity 8 and an actuator 9, wherein the self-lubricating bearing 5 is installed on the actuator 9, and the sealing core shaft 7 passes through the self-lubricating bearing 5 and is sealed with the sealing end cover 2 through the annular sealing gasket 3 and extends out of the sealing end cover 2, the tightening nut 1 is installed on the sealing core shaft 7 after extending out of the sealing end cover 2, and a pipe nozzle is provided on the top of the sealing core shaft 7 for communicating with an air pump; at the same time, an upper sealing gasket 4 is provided between the sealing end cover 2 and the self-lubricating bearing 5, and a lower sealing gasket 6 is provided between the sealing core shaft 7 and the self-lubricating bearing 5, the sealing end cover 2, the upper sealing gasket 4, the lower sealing gasket 6 and the sealing core shaft 7 are tightly fitted to form a complete sealing cavity 8 to wrap the self-lubricating bearing 5.

[0025] In this embodiment, an annular groove is provided in the sealing end cover 2 for installing the annular sealing gasket 3 .

[0026] In this embodiment, an air leakage hole 74 is reserved on the sealing core shaft 7 to ensure that the sealing cavity 8 at the self-lubricating bearing 5 can communicate with the nozzle 71 .

[0027] In this embodiment, the sealing core shaft 7 includes a pipe nozzle 71, a sealing receiving cone 72, a bearing nest 73 and a sealing support 74. The pipe nozzle 71 is arranged at the top, the sealing receiving cone 72 is arranged between the pipe nozzle 71 and the bearing nest 73, and the sealing support 74 is arranged at the bottom of the bearing nest 73. At the same time, a nut 75 is arranged at the bottom of the sealing support 74; the sealing receiving cone 72 is used to install the sealing end cover 2, and the self-lubricating bearing 5 is nested on the bearing nest 73; an upper concave ring is provided between the sealing support 74 and the bearing nest 73 for installing the upper sealing gasket 4, and the diameter of the upper concave ring is smaller than the diameter of the sealing support 74 and the bearing nest 73; a lower concave ring is provided between the bearing nest 73 and the sealing support 74 for installing the lower sealing gasket 6. Through multiple seals, the self-lubricating bearing 5 is protected from being penetrated and corroded by external oil.

[0028] In this embodiment, the working principle of the sealing protection device is as follows:

[0029] like Figure 3 As shown, the thick solid line is the pipeline. The sealing core shaft 7 passes through the self-lubricating bearing 5 and is sealed with the sealing end cover 2 through the annular sealing ring 3. Then, the tightening nut 1 is tightened. The sealing end cover 2, the upper sealing gasket 4, the lower sealing gasket 6 and the sealing core shaft 7 are tightly fitted to form a complete sealing cavity 8 that wraps the self-lubricating bearing 5. Figure 4 As shown, the sealed cavity 8 is only inflated with air by an external air pump connected to the nozzle 71 on the sealing core shaft 7, thereby further protecting the self-lubricating bearing from being penetrated and corroded by external oil.

[0030] The specific usage is as follows:

[0031] like Figure 3 As shown, after the sealing chamber 8 is connected to the primary box, tighten the tightening nut to ensure that the sealing end cover 2, the upper sealing gasket 4, the lower sealing gasket 6 and the sealing core shaft 7 are tightly fitted;

[0032] Then connect the nozzle 71 on the sealing core shaft 7 to the air pump, inject gas of a certain pressure, and simultaneously apply a layer of soapy water around the upper sealing gasket 4 and the lower sealing gasket 6 to observe whether bubbles are generated;

[0033] After the preliminary inspection of the sealing performance of the device 10, keep the air pump pressurized, such as Figure 4As shown, connect the nozzles of the remaining parts of the actuator 9 to the test bench, and then sink the entire actuator 9 into the oil tank 11 of the test bench as required to perform a sealing performance test. Pay attention to observe whether there are bubbles around the device;

[0034] Note:

[0035] The upper sealing gasket 4 and the lower sealing gasket 6 are wearing parts and need to be checked and replaced regularly;

[0036] If the surface quality of the housing end face where the self-lubricating bearing 5 is installed is good, the risk of failure of the device is small, the sealing core shaft 7 can be simplified, the nozzle 71 and the air leakage hole can be eliminated, and the equipment cost can be saved;

[0037] At the same time, the nozzle 71 on the sealing core shaft 7 can be replaced with a one-way inflation valve according to actual conditions, and the sealing cavity 8 can be inflated before the test to ensure that the internal pressure of the sealing cavity 8 is higher than the normal atmospheric pressure, which can also prevent oil penetration.

[0038] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A sealing protection device for a self-lubricating bearing after installation, comprising a tightening nut, a sealing chamber, a self-lubricating bearing and an actuator, characterized in that: After the self-lubricating bearing is installed on the actuator, it is wrapped in a sealed cavity. The sealed cavity is formed by a sealing end cover, an upper seal, a lower seal and a sealing core shaft that are tightly fitted together. Specifically, the sealing core shaft is sealed with the sealing end cover after passing through the self-lubricating bearing and extends out of the sealing end cover; the tightening nut is installed on the sealing core shaft after extending out of the sealing end cover, and a nozzle for connecting to the air pump is provided on the top of the sealing core shaft; at the same time, an upper seal is provided between the sealing end cover and the self-lubricating bearing, and a lower seal is provided between the sealing core shaft and the self-lubricating bearing; The sealing core shaft includes a pipe nozzle, a sealing receiving cone, a bearing nest and a sealing support. The pipe nozzle is arranged at the top, the sealing receiving cone is arranged between the pipe nozzle and the bearing nest, the sealing support is arranged at the bottom of the bearing nest, and a nut is arranged at the bottom of the sealing support. The self-lubricating bearing is nested on the bearing nest; an upper concave ring for installing an upper seal is arranged between the sealing support and the bearing nest, and a lower concave ring for installing a lower seal is arranged between the bearing nest and the sealing support.

2. The sealing protection device for a self-lubricating bearing after installation according to claim 1, characterized in that: An annular groove for installing an annular sealing gasket is provided in the sealing end cover.

3. The sealing protection device for a self-lubricating bearing after installation according to claim 1, characterized in that: An air leakage hole is reserved on the sealing core shaft.

4. The sealing protection device for a self-lubricating bearing after installation according to claim 1, characterized in that: The upper sealing member and the lower sealing member are both sealing gaskets.

5. The sealing protection device for a self-lubricating bearing after installation according to claim 1, characterized in that: The diameter of the upper concave ring is smaller than the diameter of the sealing support and the bearing nesting body, and the diameter of the lower concave ring is smaller than the diameter of the bearing nesting body and the sealing support.

6. The sealing protection device for a self-lubricating bearing after installation according to claim 1, characterized in that: A one-way inflation valve is used instead of the take-over nozzle.

7. The sealing protection device for a self-lubricating bearing after installation according to claim 6, characterized in that: The diameter of the upper concave ring is smaller than the diameter of the sealing support and the bearing nest; the diameter of the lower concave ring is smaller than the diameter of the bearing nest and the sealing support.

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