T-shaped inner support type self-lubricating bushing

Abstract

The application relates to a T-shaped inner support type self-lubricating bushing, which comprises a bushing body, T-shaped support pieces and solid lubricant blocks, the bushing body is provided with a plurality of through holes, a circular annular groove is coaxially arranged on the hole wall of the through hole; the T-shaped support piece is provided with a semicircular flat plate and two semicylinders located on the two side flat surfaces of the semicircular flat plate, the semicylinders are coaxial with the semicircular flat plate, and the side flat surfaces passing through the respective axes are coplanar, two T-shaped support pieces are arranged in each through hole, the two T-shaped support pieces are butted with the side flat surfaces, the two semicircular flat plates form a circular flat plate after being butted, and the four semicylinders form two whole cylinders on the two side flat surfaces of the circular flat plate; the circular flat plate is embedded in the circular annular groove; the solid lubricant blocks are in the shape of cylinders, and one solid lubricant block is sleeved on each whole cylinder. The solid lubricant of the application can be firmly connected on the bushing body and is not easy to fall off, so that the lubrication of the hinge part is obviously improved, and the service life of the pin shaft and the bushing is prolonged.

Description

Technical Field

[0001] This invention relates to a self-lubricating bushing, particularly a self-lubricating bushing used in the articulated structure of a coal mining machine. Background Technology

[0002] A coal mining machine consists of a rocker arm, machine body, height adjustment cylinder, and traveling system, primarily formed by hinged pin assemblies. The mechanical fit at the hinge is generally a transition fit. During operation, the rocker arm and cylinder rotate frequently around the pin assemblies. To extend the installation, maintenance, and service life of the rocker arm and pin assemblies, a hinged connection where the pin assemblies and bushings rotate relative to each other is often used. Relative mechanical rotation inevitably causes wear, and the quality of lubrication between the pin and bushing determines the lifespan of the pin assembly. Insufficient lubrication will result in noises and sharp sounds during the raising and lowering of the coal mining machine's rocker arm.

[0003] For hinged structures consisting of pin assemblies and bushings, there are two existing maintenance methods: one is periodic maintenance with regular grease application, and the other is a self-lubricating method using graphite-based solid lubricant embedded in the bushing. The nesting method, shape, and structure of the solid lubricant determine its service life. The existing method involves directly embedding the solid lubricant into the bushing with pre-drilled holes. Disassembling the pin assembly often results in the solid lubricant falling off or being damaged, and replacing the solid lubricant is difficult. Furthermore, the solid lubricant locations are isolated from each other, creating a lubrication vacuum zone. This leads to a large wear area on the pin and a small effective lubrication area, resulting in a short service life for both the bushing and the pin, often failing to support the completion of the advance of a single working surface. Summary of the Invention

[0004] This invention provides a T-shaped internal support self-lubricating bushing. The solid lubricant can be reliably connected to the bushing body and is not easy to fall off, thus significantly improving the lubrication at the hinge and effectively extending the service life of the pin and bushing.

[0005] The main technical solutions of this invention are as follows:

[0006] A T-shaped internal support self-lubricating bushing includes a bushing body, a T-shaped support member, and a solid lubricant block. The bushing body has multiple through holes, and the T-shaped support member is installed in each through hole. The space inside the through hole except for the T-shaped support member is filled with the solid lubricant block.

[0007] The through hole has a coaxial annular groove on its wall; the T-shaped support has a semi-circular plate and two semi-cylinders on the two sides of the semi-circular plate. The semi-cylinders are coaxial with the semi-circular plate and their side planes passing through their respective axes are coplanar. There are two T-shaped supports in each through hole. The two T-shaped supports are joined together with their side planes. After joining, the two semi-circular plates form a circular plate. The four semi-cylinders form two complete cylinders on the two sides of the circular plate. The circular plate is just embedded in the annular groove; the solid lubricant block is cylindrical, and one solid lubricant block is fitted on each complete cylinder.

[0008] The T-shaped support includes a support body, the shape of which is the same as that of the T-shaped support. The height of the semi-cylindrical part of the support body is less than that of the semi-cylindrical part of the T-shaped support. A lubricating material layer is provided on the end face of the semi-cylindrical part of the support body. The material used for the lubricating material layer is the same as that used for the solid lubricant block.

[0009] In the thickness direction of the lubricating material layer, the lubricating material layer has a variable cross-section structure, preferably with a larger cross-sectional area at the part farther away from the semi-circular plate.

[0010] The material of the support body is preferably the same as the material of the bushing body.

[0011] The inner cylindrical surface and / or outer cylindrical surface of the bushing body are provided with multiple crisscrossing grooves, each groove penetrating multiple through holes, and the intersection of two intersecting grooves is located in one of the through holes.

[0012] The groove is filled with a solid lubricant.

[0013] The cross-section of the groove can be V-shaped.

[0014] The end face of the solid lubricant block that is in contact with the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. The inner end face of the solid lubricant block is a plane, and the outer end face is a plane or a curved surface. When the outer end face of the solid lubricant block is a curved surface, it is an arc cylindrical surface with the same curvature as the corresponding cylindrical surface of the inner and outer cylindrical surfaces of the bushing body.

[0015] The beneficial effects of this invention are:

[0016] The addition of an internal support structure improves the tightness between the solid lubricant block and the bushing body, preventing unexpected wear caused by the lubricant block falling off, and helps to increase the advance speed of the coal mining machine.

[0017] The replacement of the solid lubricant block of the bushing of the present invention is significantly reduced in difficulty and time, thus shortening the worker's working time and reducing the workload and intensity of the work.

[0018] By adding grooves connecting different solid lubricant blocks on the bushing body, the originally isolated lubricant blocks are connected together, forming regional linkage and further reducing the non-lubricated surface. Even when some lubricant blocks are worn out or fall off, lubrication can still be achieved, thereby reducing the impact of poor lubrication on the reliability of the coal mining machine during non-maintenance periods.

[0019] The solid lubricant is supported by an inner support with a T-shaped structure, which further standardizes the structure of the solid lubricant. Guide holes are set in the solid lubricant to make it easier to install on the inner support and to make it more secure in contact with the bushing body.

[0020] Because a T-shaped support is provided in the through hole, even if the solid lubricant block falls off, the T-shaped support will still support the through hole. Compared with the existing self-lubricating bushings without internal support structure, the bushing of the present invention has higher strength and rigidity and reduced risk of cracking. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a structure of an embodiment of the T-shaped internal support self-lubricating bushing of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the bushing body described in the figure;

[0023] Figure 3 for Figure 1 An unfolded view of the bushing body described in the figure;

[0024] Figure 4a for Figure 1 A schematic diagram of the main structure of the solid lubricant block described in the figure;

[0025] Figure 4b for Figure 1 A side view of the solid lubricant block described herein;

[0026] Figure 5a for Figure 1 A schematic diagram of the main structure of the T-shaped support member described above;

[0027] Figure 5b for Figure 1 A side view of the T-shaped support member described herein.

[0028] Figure label:

[0029] 1. Bushing body; 11. Through hole; 12. Circular groove; 13. Groove; 2. T-shaped support; 21. Semi-circular plate; 22. Semi-cylinder; 2-1. Support body; 2-2. Lubricating material layer; 3. Solid lubricant block. Detailed Implementation

[0030] like Figure 1-5b As shown, the present invention discloses a T-shaped internal support self-lubricating bushing, including a bushing body 1, a T-shaped support 2 and a solid lubricant block 3. The bushing body is provided with a plurality of through holes 11, which are usually distributed throughout the bushing body. Figure 1 , 2 The diagram uses only a few through holes for illustration. Each through hole contains a T-shaped support, and the space inside the through hole excluding the T-shaped support is filled with the solid lubricant block.

[0031] A circular groove 12 is coaxially provided on the wall of the through hole for the installation of the T-shaped support. The T-shaped support has a semi-circular plate 21 and two semi-cylinders 22 located on the two side surfaces of the semi-circular plate. The semi-cylinders are coaxial with the semi-circular plate, and their side planes passing through their respective axes are coplanar. There are two T-shaped supports in each through hole. The two T-shaped supports are joined together with their side planes. After joining, the two semi-circular plates form a circular plate, and the four semi-cylinders form two complete cylinders on the two side surfaces of the circular plate. The circular plate is perfectly embedded in the circular groove. The solid lubricant block is cylindrical, and one solid lubricant block is fitted on each complete cylinder. The circular inner hole of the solid lubricant block is a guide hole for the solid lubricant block, making it easier to install the solid lubricant block onto the T-shaped support and making the contact between the solid lubricant block and the bushing body more secure.

[0032] The addition of an internal support structure improves the tightness between the solid lubricant block and the bushing body, preventing unexpected wear caused by lubricant block detachment and helping to increase the advance speed of the coal mining machine. Furthermore, the difficulty and time required for replacing the solid lubricant block are significantly reduced, thus shortening workers' working hours and reducing workload and intensity.

[0033] The T-shaped support includes a support body 2-1, the shape of which is the same as that of the T-shaped support. The height of the semi-cylindrical part of the support body is less than that of the semi-cylindrical part of the T-shaped support. A lubricating material layer 2-2 is provided on the end face of the semi-cylindrical part of the support body. The material used for the lubricating material layer is preferably the same as that used for the solid lubricant block.

[0034] Along the thickness direction of the lubricating material layer (which is also the axial direction of the semi-cylinder), the lubricating material layer has a variable cross-section structure, preferably with a larger cross-sectional area further away from the semi-circular plate, thus forming a barbed structure. When the solid lubricant block is fitted onto the entire cylinder, the lubricating material layer can press the solid lubricant block against the support body to a certain extent, preventing the solid lubricant block from detaching, thus making the connection between the support body and the solid lubricant block more secure.

[0035] The material of the support body is pre-selected to be the same as that of the bushing body.

[0036] For any of the aforementioned T-shaped internal support self-lubricating bushings, the inner cylindrical surface and / or outer cylindrical surface of the bushing body are further provided with multiple crisscrossing grooves 13. Each groove penetrates multiple through holes, and the intersection of two intersecting grooves is located within one of the through holes. The grooves communicate with the space occupied by the solid lubricant blocks at the through holes. Because grooves connecting different solid lubricant blocks are added to the bushing body, the originally isolated lubricant blocks are connected together, forming regional linkage and further reducing the non-lubricated surface area. Even when some lubricant blocks are worn out or fall off, lubrication can still be achieved, thereby reducing the impact of poor lubrication on the reliability of the coal mining machine during non-maintenance periods.

[0037] The groove is filled with a solid lubricant (not shown in the figure).

[0038] The groove is preferably V-shaped in cross-section for ease of processing.

[0039] The end face of the solid lubricant block that fits against the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. In any of the aforementioned T-shaped internal support self-lubricating bushings, the inner end face of the solid lubricant block is planar, and the outer end face can be either planar or curved. When the outer end face of the solid lubricant block is planar, the cross-section of the solid lubricant block is rectangular, making processing and installation simpler. During installation, the outer end face of the solid lubricant block can partially protrude beyond the outside of the bushing body; after installation, the protruding part is compressed, but it still provides lubrication. Alternatively, the solid lubricant block can be completely submerged within the bushing body during installation. When the outer end face of the solid lubricant block is curved, it is preferably an arc-shaped cylindrical surface with the same curvature as the corresponding cylindrical surfaces of the inner and outer cylindrical surfaces of the bushing body, so that the end face of the solid lubricant block is coplanar with the corresponding side cylindrical surface of the bushing body in the installed state. This results in a larger lubrication area on the surface of the bushing body and better lubrication.

Claims

1. A T-shaped internal support self-lubricating bushing, characterized in that: The device includes a bushing body, T-shaped supports, and solid lubricant blocks. The bushing body has multiple through holes, each containing a T-shaped support. The space within the through hole, excluding the T-shaped support, is filled with the solid lubricant block. A circular groove is coaxially formed on the wall of each through hole. The T-shaped support has a semi-circular plate and two semi-cylinders located on the two sides of the semi-circular plate. The semi-cylinders are coaxial with the semi-circular plate, and their side planes passing through their respective axes are coplanar. Each through hole contains two T-shaped supports, which are joined together by their side planes. After joining, the two semi-circular plates form a circular plate, and the four semi-cylinders form two complete cylinders on the two sides of the circular plate. The circular plate fits perfectly into the circular groove. The solid lubricant block is cylindrical, with one solid lubricant block fitted onto each complete cylinder.

2. The T-shaped internal support self-lubricating bushing as described in claim 1, characterized in that: The T-shaped support includes a support body, the shape of which is the same as that of the T-shaped support. The height of the semi-cylindrical part of the support body is less than that of the semi-cylindrical part of the T-shaped support. A lubricating material layer is provided on the end face of the semi-cylindrical part of the support body. The material used for the lubricating material layer is the same as that used for the solid lubricant block.

3. The T-shaped internal support self-lubricating bushing as described in claim 2, characterized in that: In the thickness direction of the lubricating material layer, the lubricating material layer has a variable cross-section structure, with the cross-sectional area being larger the further away from the semi-circular plate.

4. The T-shaped internal support self-lubricating bushing as described in claim 3, characterized in that: The material of the support body is the same as the material of the bushing body.

5. The T-shaped internal support self-lubricating bushing as described in claim 1, 2, 3 or 4, characterized in that: The inner cylindrical surface and / or outer cylindrical surface of the bushing body are provided with multiple crisscrossing grooves, each groove penetrating multiple through holes, and the intersection of two intersecting grooves is located in one of the through holes.

6. The T-shaped internal support self-lubricating bushing as described in claim 5, characterized in that: The groove is filled with a solid lubricant.

7. The T-shaped internal support self-lubricating bushing as described in claim 6, characterized in that: The trench has a V-shaped cross-section.

8. The T-shaped internal support self-lubricating bushing as described in claim 1, 2, 3 or 4, characterized in that: The end face of the solid lubricant block that is in contact with the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. The inner end face of the solid lubricant block is a plane, and the outer end face is a plane or a curved surface. When the outer end face of the solid lubricant block is a curved surface, it is an arc cylindrical surface with the same curvature as the corresponding cylindrical surface of the inner and outer cylindrical surfaces of the bushing body.

9. The T-shaped internal support self-lubricating bushing as described in claim 5, characterized in that: The end face of the solid lubricant block that is in contact with the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. The inner end face of the solid lubricant block is a plane, and the outer end face is a plane or a curved surface. When the outer end face of the solid lubricant block is a curved surface, it is an arc cylindrical surface with the same curvature as the corresponding cylindrical surface of the inner and outer cylindrical surfaces of the bushing body.

10. The T-shaped internal support self-lubricating bushing as described in claim 6, characterized in that: The end face of the solid lubricant block that is in contact with the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. The inner end face of the solid lubricant block is a plane, and the outer end face is a plane or a curved surface. When the outer end face of the solid lubricant block is a curved surface, it is an arc cylindrical surface with the same curvature as the corresponding cylindrical surface of the inner and outer cylindrical surfaces of the bushing body.

11. The T-shaped internal support self-lubricating bushing as described in claim 7, characterized in that: The end face of the solid lubricant block that is in contact with the semi-circular plate of the T-shaped support is the inner end face, and the end face exposed on the surface of the bushing body is the outer end face. The inner end face of the solid lubricant block is a plane, and the outer end face is a plane or a curved surface. When the outer end face of the solid lubricant block is a curved surface, it is an arc cylindrical surface with the same curvature as the corresponding cylindrical surface of the inner and outer cylindrical surfaces of the bushing body.

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