Sealing protection device after installation of self-lubricating bearing

Abstract

A sealing protection device after installation of a self-lubricating bearing comprises a tightening nut, a sealing cavity, the self-lubricating bearing and an actuating cylinder, the self-lubricating bearing is wrapped in the sealing cavity after being installed on the actuating cylinder, and the sealing cavity is formed by tightly attaching a sealing end cover, an upper sealing piece, a lower sealing piece and a sealing mandrel. Specifically, the sealing mandrel penetrates through the self-lubricating bearing, then is sealed with the sealing end cover and extends out of the sealing end cover; the tightening nut is mounted on the sealing mandrel extending out of the sealing end cover, and a filler neck used for being communicated with an inflator pump is arranged at the top of the sealing mandrel; meanwhile, an upper sealing piece is arranged between the sealing end cover and the self-lubricating bearing, and a lower sealing piece is arranged between the sealing mandrel and the self-lubricating bearing. The air tightness test device is simple in structure, and can solve the problem that the air tightness test cannot be normally carried out on the actuator cylinder type component of the self-lubricating bearing due to the fact that the self-lubricating bearing is difficult to protect after being installed.

Description

Technical Field

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

[0002] Self-lubricating bearings are oil-free self-lubricating bearings with the advantages of high load-bearing 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 various aircraft retractable actuators.

[0003] However, since most self-lubricating bearings achieve oil-free self-lubrication by embedding composite fabrics in the journal to reduce rotational friction, self-lubricating bearings generally have strict dust, water and oil resistance requirements to prevent the composite materials in the bearing from being contaminated. However, most retractable actuators must undergo a sealing performance test before delivery. The actuator must be placed in oil as a whole and a certain pressure of gas must be filled into the pipeline to observe whether bubbles are generated. In order to avoid oil contamination of self-lubricating bearings during the sealing performance test, the traditional practice is to adjust the process sequence, conduct a sealing test first, and then perform bearing riveting after the test is qualified. This results in the bearing riveting work that should have been performed on a single joint being adjusted to the actuator assembly stage, greatly increasing the difficulty of bearing riveting and also placing requirements on equipment capabilities. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a sealing protection device after the self-lubricating bearing is installed, 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: A sealing protection device after a self-lubricating bearing is installed, 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 mandrel being closely fitted together; specifically: 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 with the air pump is arranged on the top of the sealing core shaft; at the same time, an upper sealing member is arranged between the sealing end cover and the self-lubricating bearing, and a lower sealing member is arranged between the sealing core shaft and the self-lubricating bearing.

[0006] In the present invention, an annular groove for installing an annular sealing gasket is provided in the sealing end cover.

[0007] 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 connected with the nozzle.

[0008] In the present invention, both the upper sealing member and the lower sealing member are sealing gaskets.

[0009] 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, and multiple seals are used to protect the self-lubricating bearing from being penetrated and corroded by external oil.

[0010] 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 platform, 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 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.

[0011] In the present invention, the working principle of the sealing protection device is as follows: the sealing core shaft passes through the self-lubricating bearing and 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 sealing cavity to wrap the self-lubricating bearing inside. The sealing cavity is only connected to an external air pump through the nozzle on the sealing core shaft to assist in inflating the sealing cavity, thereby further protecting the self-lubricating bearing from being penetrated and corroded by external oil. Beneficial Effects

[0012] 1) 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 causes the actuator cylinder components using the self-lubricating bearing to be unable to perform air tightness tests normally; 2) The present invention is easy to use, and the sealing protection function can be achieved by assembling the device on the installed self-lubricating bearing; 3) In the present invention, a complete sealing cavity is formed by tightly fitting the sealing end cover, the upper sealing member, the lower sealing member and the sealing core shaft, and then the self-lubricating bearing is protected in the sealing cavity. At the same time, a nozzle is reserved on the sealing core shaft to further improve the anti-leakage performance by filling with pressurized gas, thereby reducing the difficulty of riveting the self-lubricating bearing and the requirements on equipment capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an exploded view of a preferred embodiment of the present invention.

[0014] Figure 2 It is a structural schematic diagram of a preferred embodiment of the present invention.

[0015] Figure 3 It is a cross-sectional view of a preferred embodiment of the present invention.

[0016] Figure 4 Schematic diagram of the use status of a preferred embodiment of the present invention.

[0017] Figure 5 A front view of a sealing mandrel according to a preferred embodiment of the present invention.

[0018] Figure 6 A side view of a sealing core shaft according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0020] 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 mandrel 7, a sealing cavity 8 and an actuator 9, wherein the self-lubricating bearing 5 is installed on the actuator 9, and the sealing mandrel 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 mandrel 7 after extending out of the sealing end cover 2, and a nozzle is provided on the top of the sealing mandrel 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 mandrel 7 and the self-lubricating bearing 5, and the sealing end cover 2, the upper sealing gasket 4, the lower sealing gasket 6 and the sealing mandrel 7 are tightly fitted to form a complete sealing cavity 8 to wrap the self-lubricating bearing 5.

[0021] In this embodiment, an annular groove is provided in the sealing end cover 2 for installing the annular sealing gasket 3 .

[0022] 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 be communicated with the nozzle 71 .

[0023] 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, the sealing support 74 is arranged at the bottom of the bearing nest 73, and 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 arranged 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 arranged between the bearing nest 73 and the sealing support 74 for installing the lower sealing gasket 6, and the self-lubricating bearing 5 is protected from being penetrated and corroded by external oil through multiple seals.

[0024] In this embodiment, the working principle of the sealing protection device is: 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, and then the tightening nut 1 is tightened, and the sealing end cover 2, the upper sealing gasket 4, the lower sealing gasket 6 and the sealing core shaft 7 are closely fitted to form a complete sealing cavity 8 to wrap the self-lubricating bearing 5 inside, as shown in FIG. Figure 4 As shown, the sealing cavity 8 is inflated with air only by an external air pump connected to the nozzle 71 on the sealing mandrel 7, so as to further protect the self-lubricating bearing from being penetrated and corroded by external oil; The specific usage is as follows: like Figure 3 As shown, after the sealing chamber 8 is connected to the primary sleeve, the tightening nut is screwed in 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; Then connect the nozzle 71 on the sealing mandrel 7 to the air pump, inject a certain pressure of gas, 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; After the preliminary inspection of the sealing performance of the device 10, keep the air pump pressurized. Figure 4 As shown, the nozzles of the rest of the actuator 9 are connected to the test bench, and then the actuator 9 is completely sunk into the oil tank 11 of the test bench to perform a sealing performance test as required. It is necessary to observe whether bubbles are generated around the device; Please note: The upper sealing gasket 4 and the lower sealing gasket 6 are wearing parts and need to be checked and replaced regularly; 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 not great, the sealing mandrel 7 can be simplified, the nozzle 71 and the air leakage hole can be eliminated, and the equipment cost can be saved; At the same time, according to actual conditions, the nozzle 71 on the sealing core shaft 7 can be replaced with a one-way inflation valve, and the sealing chamber 8 can be inflated before the test to ensure that the internal pressure of the sealing chamber 8 is higher than the normal atmospheric pressure, which can also prevent oil penetration.

[0025] 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A sealing protection device after a self-lubricating bearing is installed, 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 sealing cavity. The sealing cavity is formed by a sealing end cover, an upper seal, a lower seal 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 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.

2. A 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 arranged in the sealing end cover.

3. The sealing protection device after the self-lubricating bearing is installed according to claim 1, characterized in that: The sealing core shaft is provided with a leakage hole.

4. The sealing protection device after the self-lubricating bearing is installed 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 after the self-lubricating bearing is installed according to claim 1, characterized in that: 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 self-lubricating bearing is nested on the bearing nest; an upper concave ring for installing an upper seal is arranged between the sealing support platform and the bearing nest, and a lower concave ring for installing a lower seal is arranged between the bearing nest and the sealing support platform.

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

7. The sealing protection device for installing a self-lubricating bearing according to claim 1, characterized in that: 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 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.

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

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