A spherical bearing with a self-lubricating coating on the inner hole and a method of using the same

Abstract

The present invention discloses a spherical bearing with a self-lubricating coating on its inner hole and a method for using the spherical bearing. The structure comprises a mounting frame, a locking hole, a bolt and a spherical bearing. The mounting frame is penetrated by the locking hole. The mounting frame is fixed at the mounting position by locking the locking hole with the bolt. The snap-fit ​​seat arranged on the spherical bearing is inserted and installed in the snap-fit ​​groove arranged on the mounting frame. In the present invention, the outer surface of the inner ball seat contacts the surface of the polymer lubricating layer, so that the surface of the polymer lubricating layer releases a trace amount of lubricating components to lubricate the outer ball seat and the inner ball seat. At the same time, the ball also assists in sliding between the outer ball seat and the inner ball seat, and the lubricating oil in the oil storage tank is discharged onto the polymer lubricating layer, so as to improve the lubricating effect of the polymer lubricating layer between the outer ball seat and the inner ball seat, thereby effectively reducing the friction coefficient between the outer ball seat and the inner ball seat, and ensuring the smoothness of the angular rotation and swing of the spherical bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of spherical bearings, and more specifically, to a spherical bearing with a self-lubricating coating on its inner hole and a method for using the spherical bearing. Background Art

[0002] Spherical plain bearings are spherical plain bearings whose sliding contact surfaces are an inner spherical surface and an outer spherical surface. They can rotate and swing at any angle during movement. Spherical plain bearings have the characteristics of large load capacity, impact resistance, corrosion resistance, wear resistance, self-aligning, and good lubrication.

[0003] However, the existing spherical bearings with self-lubricating coatings on the inner holes have the following shortcomings: when the receiving part is installed inside the spherical bearing and rotates and swings at an angle for a long time, friction is continuously generated between the inner spherical surface and the outer spherical surface, resulting in a gradual decrease in the lubricating effect of the lubricating coating between the inner spherical surface and an outer spherical surface, thereby reducing the smoothness of the angular rotation and swinging of the receiving part installed on the spherical bearing. At the same time, after the base of the spherical bearing is installed, the vertical and lateral angles of the spherical bearing are fixed, which reduces the multi-directionality of the spherical bearing load orientation and limits the use orientation of the spherical bearing. Summary of the invention

[0004] The technical solution adopted by the present invention to achieve the technical purpose is: a spherical bearing with a self-lubricating coating on the inner hole and a method of using the spherical bearing, wherein the structure comprises a mounting frame, a locking hole, a bolt, and a spherical bearing, wherein the mounting frame is penetrated by the locking hole, and the mounting frame is fixed to the mounting position by locking the locking hole with a bolt, and the snap-fit ​​seat provided on the spherical bearing is inserted and installed in the snap-fit ​​groove provided on the mounting frame, and the spherical bearing is also provided with an outer ball seat, a composite coating and an inner ball seat, wherein the outer ball seat is fixedly installed in the upper end of the snap-fit ​​seat, and the outer surface of the inner ball seat is in sliding contact with the inner surface of the outer ball seat and is lubricated by the composite coating provided therebetween;

[0005] The composite coating consists of a metal body, a porous bronze layer, a polymer lubricating layer and flow holes. The outer ball seat and the porous bronze layer are supported by the metal body, and a polymer lubricating layer is provided on the inner side of the porous bronze layer to slide in contact with the outer surface of the inner ball seat. The flow holes run through the metal body, the porous bronze layer and the polymer lubricating layer. The metal body is made of steel and provides high strength and rigidity. The porous bronze layer provides good thermal conductivity and mechanical support. A layer of self-lubricating polymer, such as polytetrafluoroethylene, is coated on the surface of the polymer lubricating layer.

[0006] As a further improvement of the present invention, a lubrication mechanism is also provided on the outside of the outer ball seat, and the lubrication mechanism is composed of balls, a positioning plate, an oil storage tank and a sealing plug. The balls are installed inside the positioning plate and the flow hole, and the balls are in sliding contact between the outer ball seat and the inner ball seat. A sealing plug is provided on the top of the oil storage tank to seal the lubricating oil inside the oil storage tank, and the lubricating oil inside the oil storage tank is discharged between the balls and the flow hole through an inclined built-in conduit. The balls are provided in four groups, each group has three balls, and are distributed in the upper, middle and lower positions of the polymer lubricating layer. When sliding between the outer ball seat and the inner ball seat, the sliding is assisted by the balls, and the lubricating oil is discharged to the polymer lubricating layer through the flow hole.

[0007] As a further improvement of the present invention, a reversing base plate is provided at the bottom of the mounting frame, and side clamps arranged on both sides of the upper end of the reversing base plate clamp the two sides of the bottom of the mounting frame, and a positioning ring arranged on the upper end of the reversing base plate is plugged and installed in the positioning groove arranged at the lower end of the mounting frame, and the positioning groove is through-fitted with the locking hole, and the bolt passes through the locking hole, the positioning groove and the positioning ring to lock the reversing base plate to the bottom of the mounting frame.

[0008] As a further improvement of the present invention, a convex plate is also provided on the reversing base plate. During installation, the convex plate squeezes the spring and pressure plate provided inside the lower end of the mounting frame, so that the spring is pressed between the reversing base plate and the mounting frame, and the spring plays a shock-absorbing and buffering role between the reversing base plate and the mounting frame.

[0009] As a further improvement of the present invention, a plug-in board is also provided on the outside of the snap-fit ​​seat, and the plug-in board is plugged into the external connection slot provided on the edge of the snap-fit ​​slot. There are four plug-in boards and four external connection slots, and they are distributed in four directions on the outside of the snap-fit ​​seat and the snap-fit ​​slot.

[0010] As a further improvement of the present invention, a disassembly and assembly mechanism is also provided inside the external groove, and the disassembly and assembly mechanism is composed of a pull ring, a spring rod, a moving rod, an embedding block, a front top block, a connecting rod and a side top plate. The pull ring pulls the spring rod to drive the moving rod to translate inside the embedding block. The embedding block is arranged inside the external groove and is positioned and connected to the plug-in board. The embedding block connected to the front end of the moving rod is engaged with the engaging hole provided inside the lower end of the plug-in board. The outer side of the moving rod drives the side top plate to contact the inside of the engaging hole through the connecting rod.

[0011] The usage includes the following specific steps:

[0012] S1: The mounting frame is fixed at the mounting position by tightening the bolts inside the locking hole, and then the receiving part is installed inside the inner ball seat, and the receiving part is supported by the mounting frame and the engaging seat, and the receiving part is rotated and swung by the sliding contact between the outer ball seat and the inner ball seat;

[0013] S2: During the sliding contact between the outer ball seat and the inner ball seat, the outer surface of the inner ball seat contacts the surface of the polymer lubricating layer, so that the surface of the polymer lubricating layer releases a trace amount of lubricating components to lubricate the outer ball seat and the inner ball seat. At the same time, the ball also assists in sliding between the outer ball seat and the inner ball seat, and the lubricating oil inside the oil tank is discharged onto the polymer lubricating layer.

[0014] S3: The reversing base plate is locked to the bottom of the mounting frame by passing bolts through the locking hole, the positioning groove and the positioning ring. The reversing base plate changes the mounting frame from being placed horizontally to being placed vertically, and changes the axial direction of the spherical bearing on the mounting frame, so that the spherical bearing can carry the receiving part in different directions.

[0015] S4: Pull the spring rod through the pull ring to drive the moving rod to translate inside the embedded block, drive the front top block to move, and drive the side top plate to move inside the embedded block under the linkage support of the linkage rod. The front top block and the side top plate are separated from the inside of the engaging hole, and the spherical bearing can be removed from the external groove of the mounting frame for maintenance.

[0016] The beneficial effects of the present invention are:

[0017] 1. The outer surface of the inner ball seat contacts the surface of the polymer lubricating layer, so that the surface of the polymer lubricating layer releases a trace amount of lubricating components to lubricate the outer ball seat and the inner ball seat. At the same time, the ball also assists in sliding between the outer ball seat and the inner ball seat, and the lubricating oil inside the oil tank is discharged onto the polymer lubricating layer, which improves the lubrication effect of the polymer lubricating layer between the outer ball seat and the inner ball seat, thereby effectively reducing the friction coefficient between the outer ball seat and the inner ball seat, ensuring the smoothness of the angular rotation and swing of the joint bearing;

[0018] 2. For horizontal installation, the mounting frame can be fixed flat on the mounting position by simply locking the bolts on the locking holes. When vertical installation is required, a reversing base plate is installed at the bottom of the mounting frame. By fixing the reversing base plate on the mounting position, the vertical installation of the mounting frame is realized, the axial direction of the spherical bearing on the mounting frame is changed, and the multi-directionality of the spherical bearing load orientation is improved;

[0019] 3. Pull the spring rod through the pull ring to drive the moving rod to translate inside the embedded block, drive the front top block to move, and drive the side top plate to move inside the embedded block under the linkage support of the linkage rod. The front top block and the side top plate are separated from the inside of the engaging hole, and the spherical bearing can be removed from the external groove of the mounting frame for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic structural diagram of a spherical plain bearing having a self-lubricating coating on its inner hole and a method for using the spherical plain bearing.

[0021] Figure 2 It is a schematic diagram of the internal structure of the spherical bearing of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the composite coating of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the mounting frame of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the reversing base plate of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the engaging seat of the present invention.

[0026] Figure 7 It is a schematic diagram of the internal structure of the mounting frame of the present invention.

[0027] Figure 8 It is a structural schematic diagram of the disassembly and assembly mechanism of the present invention.

[0028] In the figure: mounting frame 1, locking hole 2, bolt 3, spherical bearing 4, snap-fit ​​seat 41, outer ball seat 42, composite coating 43, inner ball seat 44, lubrication mechanism 45, metal body 431, porous bronze layer 432, polymer lubrication layer 433, flow hole 434, ball 451, positioning plate 452, oil storage tank 453, sealing plug 454, reversing base plate 11, side Card plate 111, positioning ring 112, convex plate 113, engaging groove 12, positioning groove 13, spring 14, pressure plate 15, plug-in plate 411, engaging hole 4111, external groove 121, disassembly mechanism 122, pull ring 1221, spring rod 1222, moving rod 1223, splicing block 1224, front top block 1225, connecting rod 1226, side top plate 1227. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings: Embodiment 1:

[0030] As attached Figure 1 To Attachment Figure 5 As shown:

[0031] The present invention discloses a spherical bearing with a self-lubricating coating on its inner hole and a method for using the spherical bearing. The structure of the spherical bearing comprises a mounting frame 1, a locking hole 2, a bolt 3, and a spherical bearing 4. The mounting frame 1 has a locking hole 2 running through it. The mounting frame 1 is fixed to the mounting position by locking the locking hole 2 with the bolt 3. The snap-fit ​​seat 41 provided on the spherical bearing 4 is plugged and installed in the snap-fit ​​groove 12 provided on the mounting frame 1. The spherical bearing 4 is also provided with an outer ball seat 42, a composite coating 43, and an inner ball seat 44. The outer ball seat 42 is fixedly installed in the upper end of the snap-fit ​​seat 41. The outer surface of the inner ball seat 44 is in sliding contact with the inner surface of the outer ball seat 42 and is lubricated by the composite coating 43 provided therebetween.The composite coating 43 is composed of a metal body 431, a porous bronze layer 432, a polymer lubricating layer 433 and a flow hole 434. The outer ball seat 42 and the porous bronze layer 432 are supported by the metal body 431, and the inner side of the porous bronze layer 432 is provided with a polymer lubricating layer 433 that is in sliding contact with the outer surface of the inner ball seat 44. The flow hole 434 runs through the metal body 431, the porous bronze layer 432 and the polymer lubricating layer 433. A lubrication mechanism 45 is also provided on the outer side of the outer ball seat 42. The lubrication mechanism 45 is composed of a ball 451, a positioning plate 452, an oil storage tank 453 and a sealing plug 454. The ball 451 is installed in the positioning plate 452 and the flow hole 434. The ball 451 is moved in the outer ball seat 42 by the ball 451. The oil tank 453 is in sliding contact with the inner ball seat 44, and a sealing plug 454 is provided on the top of the oil tank 453 to seal the lubricating oil inside the oil tank 453, and the lubricating oil inside the oil tank 453 is discharged to between the ball 451 and the flow hole 434 through the inclined built-in conduit. A reversing base plate 11 is provided at the bottom of the mounting frame 1, and the side clamping plates 111 provided on both sides of the upper end of the reversing base plate 11 clamp the two sides of the bottom of the mounting frame 1, and the positioning ring 112 provided on the upper end of the reversing base plate 11 is plugged and installed in the positioning groove 13 provided at the lower end of the mounting frame 1, and the positioning groove 13 is through-matched with the locking hole 2. A convex plate 113 is also provided on the reversing base plate 11. When installing, the convex plate 113 squeezes the spring 14 and the pressure plate 15 provided inside the lower end of the mounting frame 1, and the spring 14 is pressed against the The spring 14 plays a shock-absorbing and buffering role between the reversing base plate 11 and the mounting frame 1, so as to avoid vibration between the vertically placed mounting frame 1 and the reversing base plate 11, which may cause the joint bearing 4 to support the receiving part in an unstable manner. In the present invention, when the receiving part rotates and swings at an angle when the joint bearing 4 is loaded, the outer ball seat 42 and the inner ball seat 44 are in sliding contact, and the outer surface of the inner ball seat 44 is in contact with the surface of the polymer lubricating layer 433, so that the surface of the polymer lubricating layer 433 releases a trace amount of lubricating components to lubricate the outer ball seat 42 and the inner ball seat 44. At the same time, the ball 451 also assists in sliding between the outer ball seat 42 and the inner ball seat 44, and the lubricating oil in the oil storage tank 453 is discharged to the polymer On the lubricating layer 433, the lubricating effect of the polymer lubricating layer 433 between the outer ball seat 42 and the inner ball seat 44 is improved, thereby effectively reducing the friction coefficient between the outer ball seat 42 and the inner ball seat 44, ensuring the smoothness of the angular rotation and swinging of the joint bearing 4, and installing the mounting frame 1 horizontally or vertically according to the installation angle requirements of the receiving part. For horizontal installation, the mounting frame 1 can be fixed flatly at the installation position by locking the bolt 3 on the locking hole 2. When vertical installation is required, the reversing base plate 11 is installed at the bottom of the mounting frame 1. By fixing the reversing base plate 11 at the installation position, the vertical installation of the mounting frame 1 is realized, the axial direction of the joint bearing 4 on the mounting frame 1 is changed, and the multi-directionality of the bearing orientation of the joint bearing 4 is improved. ;

[0032] A preferred technical solution, the metal body 431 is made of steel, providing high strength and rigidity to support the entire composite coating 43, the porous bronze layer 432 provides good thermal conductivity and mechanical support to ensure the stability of the polymer lubricating layer 433, and the surface of the polymer lubricating layer 433 is coated with a layer of self-lubricating polymer, such as polytetrafluoroethylene, so as to reduce the friction coefficient between the outer ball seat 42 and the inner ball seat 44;

[0033] A preferred technical solution, the balls 451 are provided in four groups, each group having three balls, which are distributed in the upper, middle and lower positions of the polymer lubricating layer 433. When the outer ball seat 42 and the inner ball seat 44 slide, the balls 451 assist the sliding, and the lubricating oil is discharged to the polymer lubricating layer 433 through the flow hole 434, thereby improving the lubrication effect of the polymer lubricating layer 433 between the outer ball seat 42 and the inner ball seat 44, thereby effectively reducing the friction coefficient between the outer ball seat 42 and the inner ball seat 44, and ensuring the smoothness of the angular rotation and swing of the joint bearing 4;

[0034] A preferred technical solution is that the bolt 3 passes through the locking hole 2, the positioning groove 13 and the positioning ring 112 to lock the reversing base plate 11 at the bottom of the mounting frame 1. The reversing base plate 11 is supported at the mounting position, so that the horizontally placed mounting frame 1 can be changed to a vertical placement, thereby changing the axial direction of the joint bearing 4 on the mounting frame 1 and improving the multi-directionality of the load-bearing orientation of the joint bearing 4.

[0035] Embodiment 2: Based on embodiment 1, as shown in the attached Figure 6 To Attachment Figure 8 As shown:

[0036] The outer side of the snap-fit ​​seat 41 is also provided with a plug-in board 411, which is plugged into the external slot 121 set at the edge of the snap-fit ​​slot 12, and the external slot 121 is also provided with a disassembly mechanism 122, which is composed of a pull ring 1221, a spring rod 1222, a moving rod 1223, an inlay block 1224, a front top block 1225, a connecting rod 1226 and a side top plate 1227. The pull ring 1221 pulls the spring rod 1222 to drive the moving rod 1223 to move in the inlay block 1 224 is translated inside, the engaging block 1224 is arranged inside the external groove 121 and is positioned and connected with the plug board 411, the engaging block 1224 connected to the front end of the moving rod 1223 is engaged with the engaging hole 4111 arranged inside the lower end of the plug board 411, and the outer side of the moving rod 1223 drives the side top plate 1227 to abut against the inside of the engaging hole 4111 through the connecting rod 1226. In the present invention, the spring rod 1222 is pulled by the pull ring 1221 to drive the moving rod 1223 to engage in the engaging block 1 224 is translated inside, driving the front top block 1225 to move, and driving the side top plate 1227 to move to the inside of the embedded block 1224 under the linkage support of the linkage rod 1226, the front top block 1225 and the side top plate 1227 are separated from the inside of the engaging hole 4111, and the joint bearing 4 can be removed from the inside of the external groove 121 of the mounting frame 1 for maintenance. When resetting and installing, the four plug-in plates 411 outside the engaging seat 41 are plugged into the four external grooves 121 outside the engaging groove 12, and at the same time The lower end of the plug-in board 411 is engaged with the engaging block 1224 to improve the accuracy of the reset installation of the joint bearing 4 on the mounting frame 1. Then the pull ring 1221 is loosened and the front top block 1225 and the side top plate 1227 are again inserted into the engaging hole 4111 under the reset elasticity of the spring rod 1222, so that the plug-in board 411 is firmly engaged in the engaging groove 12, thereby improving the firmness of the installation of the joint bearing 4 and preventing the joint bearing 4 from falling off from the external groove 121 on the mounting frame 1.

[0037] A preferred technical solution is that there are four plug-in boards 411 and four external slots 121, which are distributed at four positions outside the snap-fit ​​seat 41 and the snap-fit ​​slot 12. The accuracy of the snap-fit ​​seat 41 being positioned and snap-fitted inside the snap-fit ​​slot 12 is improved through the positioning and plug-in cooperation of the plug-in boards 411 and the external slots 121.

[0038] Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A spherical plain bearing having an inner hole with a self-lubricating coating, the structure of which comprises a mounting frame (1), a locking hole (2), a bolt (3), and a spherical plain bearing (4), wherein the mounting frame (1) has a locking hole (2) running through it, the mounting frame (1) is fixed at a mounting position by locking the locking hole (2) with the bolt (3), and a snap-fit ​​seat (41) provided on the spherical plain bearing (4) is plugged and installed in a snap-fit ​​groove (12) provided on the mounting frame (1), characterized in that: The spherical bearing (4) is also provided with an outer ball seat (42), a composite coating (43) and an inner ball seat (44); the outer ball seat (42) is fixedly mounted inside the upper end of the snap-fit ​​seat (41); the outer surface of the inner ball seat (44) is in sliding contact with the inner surface of the outer ball seat (42) and is lubricated by the composite coating (43) provided therebetween; The composite coating (43) is composed of a metal body (431), a porous bronze layer (432), a polymer lubricating layer (433) and a flow hole (434); the outer ball seat (42) and the porous bronze layer (432) are supported by the metal body (431), and the inner side of the porous bronze layer (432) is provided with a polymer lubricating layer (433) in sliding contact with the outer surface of the inner ball seat (44); and the flow hole (434) runs through the metal body (431), the porous bronze layer (432) and the polymer lubricating layer (433).

2. A spherical plain bearing with a self-lubricating coating on its inner hole according to claim 1, characterized in that: A lubricating mechanism (45) is also provided on the outside of the outer ball seat (42). The lubricating mechanism (45) is composed of a ball (451), a positioning plate (452), an oil storage tank (453) and a sealing plug (454). The ball (451) is installed inside the positioning plate (452) and the flow hole (434). The ball (451) is in sliding contact between the outer ball seat (42) and the inner ball seat (44). A sealing plug (454) is provided on the top of the oil storage tank (453) to seal the lubricating oil inside the oil storage tank (453). The lubricating oil inside the oil storage tank (453) is discharged between the ball (451) and the flow hole (434) through an inclined built-in conduit.

3. A spherical plain bearing with a self-lubricating coating on the inner hole according to claim 2, characterized in that: A reversing base plate (11) is provided at the bottom of the mounting frame (1), and side clamping plates (111) provided at both sides of the upper end of the reversing base plate (11) clamp the two sides of the bottom of the mounting frame (1), and a positioning ring (112) provided at the upper end of the reversing base plate (11) is inserted and installed in a positioning groove (13) provided at the lower end of the mounting frame (1), and the positioning groove (13) is through-fitted with the locking hole (2).

4. A spherical plain bearing with a self-lubricating coating on the inner hole according to claim 3, characterized in that: The reversing base plate (11) is also provided with a convex plate (113). During installation, the convex plate (113) presses the spring (14) and the pressure plate (15) provided inside the lower end of the mounting frame (1), so that the spring (14) is pressed between the reversing base plate (11) and the mounting frame (1).

5. A spherical plain bearing with a self-lubricating coating on the inner hole according to claim 4, characterized in that: The outer side of the snap-fit ​​seat (41) is also provided with a plug-in board (411), and the plug-in board (411) is plugged and installed inside an external connection slot (121) provided at the edge of the snap-fit ​​slot (12).

6. A spherical plain bearing with a self-lubricating coating on its inner hole according to claim 5, characterized in that: The external connection groove (121) is further provided with a disassembly and assembly mechanism (122) therein. The disassembly and assembly mechanism (122) is composed of a pull ring (1221), a spring rod (1222), a moving rod (1223), an inlay block (1224), a front top block (1225), a linkage rod (1226) and a side top plate (1227). The pull ring (1221) pulls the spring rod (1222) to drive the moving rod (1223) to engage with the inlay block (1224). The movable rod (1223) is provided with a side top plate (1227) which is abutted against the inside of the engaging hole (4111) by the outer side of the movable rod (1223) through the connecting rod (1226).

7. A method for using a spherical bearing having a self-lubricating coating on its inner hole, applied to the spherical bearing having a self-lubricating coating on its inner hole as claimed in claim 6, characterized in that: The usage includes the following specific steps: S1: The mounting frame (1) is fixed at the mounting position by tightening the bolt (3) inside the locking hole (2), and then the receiving part is installed inside the inner ball seat (44). The receiving part is supported by the mounting frame (1) and the engaging seat (41), and the receiving part is rotated and swung at an angle by sliding contact between the outer ball seat (42) and the inner ball seat (44); S2: During the sliding contact between the outer ball seat (42) and the inner ball seat (44), the outer surface of the inner ball seat (44) contacts the surface of the polymer lubricating layer (433), so that the surface of the polymer lubricating layer (433) releases a trace amount of lubricating components to lubricate the outer ball seat (42) and the inner ball seat (44), and at the same time, the ball (451) also assists in sliding between the outer ball seat (42) and the inner ball seat (44), and the lubricating oil inside the oil tank (453) is discharged onto the polymer lubricating layer (433); S3: The reversing base plate (11) is locked to the bottom of the mounting frame (1) by passing a bolt (3) through the locking hole (2), the positioning groove (13) and the positioning ring (112). The reversing base plate (11) changes the mounting frame (1) from being placed horizontally to being placed vertically, and changes the axial direction of the spherical bearing (4) on the mounting frame (1), so that the spherical bearing (4) can carry the bearing in different directions on the receiving part. S4: The spring rod (1222) is pulled by the pull ring (1221) to drive the moving rod (1223) to translate inside the embedded block (1224), drive the front top block (1225) to move, and drive the side top plate (1227) to move toward the inside of the embedded block (1224) under the linkage support of the linkage rod (1226). The front top block (1225) and the side top plate (1227) are separated from the inside of the engaging hole (4111), and the joint bearing (4) can be removed from the inside of the external groove (121) of the mounting frame (1) for maintenance.

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