Detachable composite roller bearing

Abstract

The embodiment of the invention provides a detachable composite roller bearing, and relates to the technical field of bearings. The detachable composite roller bearing comprises a mounting plate and a fixing seat, a fixing frame is fixedly connected to the side, close to the mounting plate, of the fixing seat, and a fixing box is fixedly connected to the bottom of the fixing frame; an inner bearing is embedded in an inner cavity of the fixing seat through a pin shaft, the outer side of the mounting plate is sleeved with an outer bearing compositely matched with the inner bearing, the inner bearing adopts a symmetrical double-row roller design, and the outer bearing adopts a compact single-row roller design; a plugging assembly used in cooperation with the inner bearing and the outer bearing is arranged on the fixing base, the plugging assembly comprises a sealing inner ring embedded in the inner side of the outer bearing, and a disassembling and assembling assembly matched with the mounting plate and the fixing base in a disassembling and assembling mode is arranged on the fixing frame. On the basis of sealing and oil plugging, the composite roller bearing can be quickly disassembled and assembled, regular maintenance is facilitated, and time and labor are saved.

Description

Technical Field

[0001] This invention belongs to the field of bearing technology, and particularly relates to a detachable composite roller bearing. Background Technology

[0002] Composite roller bearings, also known as combined roller bearings, are mainly used in gantry lifting systems in fields such as forklifts, tunnel boring machines, metallurgical equipment, and logistics automation. They can withstand high dynamic and static loads and are mainly used between slide rails and lifting arms to provide axial and radial rolling limit functions, ensuring the stable movement of external components.

[0003] The existing technology (publication number CN216842688U, patent application titled "A Composite Roller Bearing") has advantages such as long service life and low friction, solving the problem of high friction and bearing damage and detachment. However, in the process of implementing this technical solution, at least the following problems were found in the existing technology:

[0004] During the application of composite roller bearings, the damaged composite roller bearings are basically disassembled and reassembled manually by removing and installing a number of screws with the help of tools. This method is not only time-consuming and labor-intensive, but also has low disassembly and repair efficiency. In addition, screws are prone to falling off or being lost during disassembly and reassembly, resulting in misinstallation, omission, and incorrect installation, which is not worth the effort. Summary of the Invention

[0005] This application aims to at least solve the technical problem in the prior art that it is impossible to achieve rapid disassembly and assembly of composite roller bearings based on sealing and oil plugging. To this end, this application proposes a detachable composite roller bearing.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0007] A detachable composite roller bearing includes a mounting plate and a fixed base. A fixed frame is fixedly connected to the side of the fixed base near the mounting plate, and a fixed box is fixedly connected to the bottom of the fixed frame.

[0008] The inner cavity of the fixed seat is fitted with an inner bearing through a pin, and the outer side of the mounting plate is fitted with an outer bearing that is matched with the inner bearing. The inner bearing adopts a symmetrical double-row roller design, and the outer bearing adopts a compact single-row roller design.

[0009] The mounting base is provided with a sealing assembly for use with the inner bearing and the outer bearing, and the sealing assembly includes a sealing inner ring embedded in the inner side of the outer bearing. The mounting bracket is provided with a disassembly and assembly assembly for disassembly and assembly with the mounting plate and the mounting base.

[0010] Preferably, the sealing assembly further includes a sealing outer ring embedded on the outside of the outer bearing, and an elastic pull ring is sleeved inside the sealing inner ring and the sealing outer ring. A positioning hole is opened on the outside of the fixing seat, and a positioning head is inserted into the positioning hole. A sealing cover that matches the positioning of the inner bearing and the outer bearing is fixedly connected to the outside of the positioning head, and is fixed to the fixing seat by an anti-loosening screw.

[0011] Preferably, the disassembly and assembly assembly includes a rotating head that rotates on the top of the fixed frame, and the bottom of the rotating head is fixedly connected to a forward and reverse screw that rotates with the fixed box. The upper and lower sides of the forward and reverse screws are threaded with threaded sleeves, and a support plate is fixedly connected to the threaded sleeves. A clamp is fixedly connected to the support plate, and a clamping seat that engages with the clamp is fixedly connected to the mounting plate.

[0012] Preferably, the inner circumference of the sealing inner ring and the sealing outer ring is fixed with a limiting protrusion that cooperates with the elastic pull ring to prevent obstruction, and both sides of the fixing seat are embedded with a sealing cap that cooperates with the pin shaft. The inner circumference of the sealing cap is fixed with a rib, and both ends of the pin shaft are provided with an inner groove that engages with the rib.

[0013] Preferably, the upper and lower sides of the fixed frame are provided with T-shaped sliding grooves, and a T-shaped slider that is fixedly connected to the threaded sleeve is slidably connected in the T-shaped sliding groove. Limiting through grooves are provided from top to bottom on the outside of the fixed frame, and limiting sliding openings that are slidably connected to the limiting through grooves are provided on both sides of the support plate.

[0014] Preferably, a guide block is horizontally fixed at the center of the fixing frame near the center of the limiting groove, and a guide groove that engages with the guide block is opened at the center of the card seat near the center of the fixing frame.

[0015] Preferably, the upper and lower sides of the card holder are both fixed with positioning blocks in an array, and the inner side of the card head is provided with positioning grooves that engage with the positioning blocks.

[0016] Preferably, the mounting plate has locking protrusions fixed in an array on both the upper and lower sides near the card seat, and the outer side of the card head has locking through grooves that are inserted into the locking protrusions.

[0017] Preferably, the rotating head adopts a hexagonal groove design, and the fixing frame has a buckle groove on the outer side near the rotating head, and a sealing head that limits and protects the rotating head is engaged in the buckle groove.

[0018] Preferably, the fixed base is inclinedly fixed with curved arms around the perimeter of the fixed frame, and the outer side of the curved arms is rotatably connected with guide rollers that roll with the outer bearing and have scraping strips.

[0019] The detachable composite roller bearing of the present invention has the following advantages:

[0020] 1. This detachable composite roller bearing firstly uses an inner and outer sealing ring to provide bidirectional oil prevention for the outer bearing. An elastic pull ring within the bearing further enhances the binding force of the inner and outer sealing rings, preventing loosening or detachment due to the rotational stress of the outer bearing. This improves the sealing and oil prevention performance of the outer bearing. Furthermore, positioning holes, positioning heads, and sealing caps provide overall limiting and blocking treatment on the outer sides of both the outer and inner bearings, ensuring the overall robustness of the composite roller bearing and preventing loosening and oil leakage.

[0021] 2. This detachable composite roller bearing requires disassembly and assembly. First, rotate the rotating head clockwise and counterclockwise to drive the forward and reverse screws to rotate in the same direction. The forward and reverse screws drive the two sets of support plates to move inward or outward synchronously through two sets of threaded sleeves. The two sets of support plates drive the two sets of clamps to move inward or outward on the mounting plate's clamp seat. When the clamps move inward, they lock onto the clamp seat, achieving the installation effect of the mounting plate and the fixed seat. When the clamps move outward, they detach from the clamp seat, achieving the disassembly effect of the mounting plate and the fixed seat. This provides quick disassembly and assembly, saves time and effort, is simple and clear, and has high maintenance efficiency.

[0022] 3. When installing this detachable composite roller bearing, the clockwise rotating head drives the forward and reverse screws to rotate in the forward direction. The forward and reverse screws also drive the ratchet to rotate synchronously. The ratchet drives the two sets of pawls to skip teeth on their teeth. The two sets of pawls skip teeth and also cause the two springs to contract frequently, and drive the dials on the two rotating rods to move back and forth, applying reverse restriction measures to the forward and reverse screws to prevent the composite roller bearing from loosening in the reverse direction after installation, thereby improving the installation stability of the composite roller bearing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the detachable composite roller bearing structure of the present invention;

[0025] Figure 2 This is a front view of the detachable composite roller bearing structure of the present invention;

[0026] Figure 3 This is an exploded bottom view of the detachable composite roller bearing structure of the present invention;

[0027] Figure 4This is an exploded side view of the detachable composite roller bearing structure of the present invention;

[0028] Figure 5 This is an exploded cross-sectional view of the detachable composite roller bearing structure of the present invention;

[0029] Figure 6 This is an exploded cross-sectional view of the outer bearing and sealing assembly structure of the present invention;

[0030] Figure 7 This is a side view of the structure of the fixing frame, disassembly assembly, and restraint assembly of the present invention;

[0031] Figure 8 This is a rear view of the disassembly and assembly components and the limiting components of the present invention;

[0032] Figure 9 This is a partial bottom view of the disassembly and assembly component structure of the present invention;

[0033] Figure 10 This is a bottom view of the fixing frame structure of the present invention;

[0034] Figure 11 This is a side view of the mounting plate and card slot structure of the present invention;

[0035] Figure 12 This is a side view of the forward and reverse screws and the limiting assembly structure of the present invention.

[0036] Explanation of markings in the diagram: 1. Mounting plate; 2. Fixing base; 3. Fixing bracket; 4. Fixing box; 5. Pin; 6. Inner bearing; 7. Outer bearing; 81. Inner sealing ring; 82. Outer sealing ring; 83. Elastic pull ring; 84. Positioning hole; 85. Positioning head; 86. Sealing cap; 91. Rotating head; 92. Forward and reverse screws; 93. Threaded sleeve; 94. Support plate; 95. Clamp; 96. Clamping seat; 101. Ratchet; 102. Pawl; 10 3. Spring; 104. Rotating rod; 105. Dial head; 11. Limiting protrusion; 12. Sealing cap; 13. Protruding rib; 14. Inner groove; 15. T-shaped slide; 16. T-shaped slider; 17. Limiting through groove; 18. Limiting slide opening; 19. Guide block; 20. Guide groove; 21. Positioning block; 22. Positioning groove; 23. Locking protrusion; 24. Locking through groove; 25. Sealing head; 26. Bent arm; 27. Guide roller; 28. Scraper strip. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0038] like Figures 1-12As shown, the detachable composite roller bearing of the present invention includes a mounting plate 1 and a fixing seat 2. A fixing frame 3 is fixedly connected to the side of the fixing seat 2 near the mounting plate 1, and a fixing box 4 is fixedly connected to the bottom of the fixing frame 3. An inner bearing 6 is embedded in the inner cavity of the fixing seat 2 through a pin 5, and an outer bearing 7 that is compositely matched with the inner bearing 6 is sleeved on the outer side of the mounting plate 1. The inner bearing 6 adopts a symmetrical double-row roller design, and the outer bearing 7 adopts a compact single-row roller design. The fixing seat 2 is inclinedly fixed with bent arms 26 around the fixing frame 3, and the outer side of the bent arms 26 is rotatably connected with guide rollers 27 that roll with the outer bearing 7 and have scraping strips 28. While the four sets of guide rollers 27 follow the rotation of the outer bearing 7, they also perform axial and radial stable rolling treatment on the outer bearing 7, and the scraping strips 28 that follow the rotation of the four sets of guide rollers 27 scrape off the dirt adhering to the outer bearing 7.

[0039] The fixed base 2 is equipped with a sealing component that works in conjunction with the inner bearing 6 and the outer bearing 7. The sealing component includes a sealing inner ring 81 embedded inside the outer bearing 7 to ensure the overall firmness of the composite roller bearing and prevent loosening and oil leakage. The fixed frame 3 is equipped with a disassembly and assembly component that works with the mounting plate 1 and the fixed base 2 to achieve the disassembly and assembly of the mounting plate 1 and the fixed base 2. This allows for quick disassembly and assembly, saving time and effort, and is simple and clear, resulting in high maintenance efficiency.

[0040] like Figures 4-11 As shown, the sealing assembly also includes a sealing outer ring 82 embedded on the outside of the outer bearing 7. The sealing inner ring 81 and the sealing outer ring 82 first provide bidirectional sealing and oil prevention for the outer bearing 7. The elastic pull ring 83 inside enhances the binding of the sealing inner ring 81 and the sealing outer ring 82 to prevent the sealing inner ring 81 and the sealing outer ring 82 from loosening or falling off due to the rotational stress of the outer bearing 7, thereby improving the sealing and oil prevention performance of the outer bearing 7.

[0041] Furthermore, the inner sealing ring 81 and the outer sealing ring 82 are fitted with elastic pull rings 83, and the outer side of the fixed seat 2 is provided with a positioning hole 84, and a positioning head 85 is inserted into the positioning hole 84. The outer side of the positioning head 85 is fixedly connected with a sealing cover 86 that limits the inner bearing 6 and the outer bearing 7, and is fixed to the fixed seat 2 by anti-loosening screws. The positioning hole 84, the positioning head 85 and the sealing cover 86 provide overall limiting and blocking treatment for the outer side of the outer bearing 7 and the inner bearing 6, ensuring the overall firmness of the composite roller bearing and preventing loosening and oil leakage.

[0042] The inner circumference of the sealing inner ring 81 and the sealing outer ring 82 is fixed with a limiting protrusion 11 that cooperates with the elastic pull ring 83 to limit the elastic pull ring 83 and prevent it from slipping out of the sealing inner ring 81 and the sealing outer ring 82 under force. Both sides of the fixing seat 2 are fitted with sealing caps 12 that cooperate with the pin 5 to seal and block oil at both ends of the pin 5, thereby improving the sealing performance of the inner bearing 6. The inner circumference of the sealing cap 12 is fixed with a rib 13, and both ends of the pin 5 are provided with inner grooves 14 that engage with the rib 13, which limit the movement and prevent slippage between the pin 5 and the sealing cap 12, further improving the insertion firmness of the pin 5.

[0043] The assembly / disassembly component includes a rotating head 91 that rotates on top of the mounting bracket 3. The bottom of the rotating head 91 is fixedly connected to a forward and reverse screw 92 that rotatably engages with the mounting box 4. Rotating the rotating head 91 clockwise or counterclockwise drives the forward and reverse screw 92 to rotate in the opposite directions. Threaded sleeves 93 are threaded to both the upper and lower sides of the forward and reverse screw 92, and support plates 94 are fixedly connected to the threaded sleeves 93. The forward and reverse screw 92 drives two sets of support plates 94 to move synchronously inward or outward through the two sets of threaded sleeves 93. A clip 95 is fixedly connected to plate 94, and a clip seat 96 that engages with the clip 95 is fixedly connected to mounting plate 1. The two sets of support plates 94 drive the two sets of clips 95 to move inward or outward on the clip seat 96 of mounting plate 1. When the clip 95 moves inward, it engages with the clip seat 96, thus achieving the installation effect of mounting plate 1 and fixing seat 2. When the clip 95 moves outward, it detaches from the clip seat 96, thus achieving the disassembly effect of mounting plate 1 and fixing seat 2. This provides a quick disassembly and assembly function, saving time and effort, and is simple and clear, with high maintenance efficiency.

[0044] T-shaped grooves 15 are provided on both the upper and lower sides of the fixed frame 3, and T-shaped sliders 16 that are fixedly connected to the threaded sleeve 93 are slidably connected in the T-shaped grooves 15, which play a role in sliding limit of the threaded sleeve 93. Limiting grooves 17 are provided on the outside of the fixed frame 3 from top to bottom, and limiting sliding openings 18 that are slidably connected to the limiting grooves 17 are provided on both sides of the support plate 94, which play a role in sliding support of the support plate 94 to prevent the support plate 94 from tilting and shaking. A guide block 19 is horizontally fixed at the center of the fixed frame 3 near the limiting groove 17, and a guide groove 20 that engages with the guide block 19 is provided at the center of the card seat 96 near the fixed frame 3, which plays a role in pre-connection of the fixed frame 3 and the mounting plate 1.

[0045] Positioning blocks 21 are fixedly arranged on both the upper and lower sides of the card holder 96, and positioning grooves 22 that engage with the positioning blocks 21 are arranged on the inner side of the card head 95, which serve to engage and position the card holder 96 and the card head 95. Locking protrusions 23 are fixedly arranged on both the upper and lower sides of the mounting plate 1 near the card holder 96, and locking through grooves 24 that are inserted into the locking protrusions 23 are arranged on the outer side of the card head 95, which further achieves the locking and limiting effect of the card holder 96 and the card head 95 and improves their engagement firmness. The rotating head 91 adopts a hexagonal groove design, which makes it easy to use a hexagonal wrench to insert into the rotating head 91 and rotate it clockwise and counterclockwise. The fixing bracket 3 has a buckle groove near the outer side of the rotating head 91, and a sealing head 25 that engages with the rotating head 91 for limiting and protecting it is engaged in the buckle groove, which provides protection for the rotating head 91 in the stationary state.

[0046] like Figure 12 As shown, during the disassembly and assembly of the composite roller bearing, reverse restraint measures cannot be implemented on the installed composite roller bearing. Due to the external pressure stress on the bearing, the installation point of the composite roller bearing becomes loose, affecting the installation stability of the composite roller bearing. The fixing box 4 is equipped with a restraining component used in conjunction with the disassembly and assembly components. The restraining component includes a ratchet 101 fixed to the bottom of the forward and reverse screws 92. The clockwise rotating head 91 drives the forward and reverse screws 92 to rotate forward. The clockwise rotating forward and reverse screws 92 also drive the ratchet 101 to rotate synchronously. Both sides of the ratchet 101 are engaged with pawls 102, and the ratchet 101 is connected to the rotating rod 1. 04 is rotatably engaged with the fixed box 4, and the outer side of the pawl 102 is fixedly connected to a spring 103 that is fixedly engaged with the fixed box 4. The ratchet 101 drives the two sets of pawls 102 to perform a tooth-skipping action on their teeth. The two sets of pawls 102 that perform the tooth-skipping action also cause the two springs 103 to contract at a certain frequency. The top of the rotating rod 104 is fixedly connected to a dial 105. The two sets of pawls 102 that perform the tooth-skipping action also drive the dial 105 on the two rotating rods 104 to move back and forth, applying reverse restriction measures to the forward and reverse screws 92 to prevent the composite roller bearing from loosening in the reverse direction after installation, thereby improving the installation stability of the composite roller bearing.

[0047] Working principle of detachable composite roller bearing: When installing the composite roller bearing, first insert the guide block 19 on the fixed frame 3 carrying the composite roller bearing into the guide groove 20 of the card seat 96 on the mounting plate 1, then remove the sealing head 25, and then use a hex wrench to insert into the rotating head 91, and drive the forward and reverse screws 92 to rotate forward. The forward and reverse screws 92 drive the two sets of threaded sleeves 93 to move inward synchronously. The two sets of threaded sleeves 93 drive the card heads 95 on the two support plates 94 to move inward accordingly, until the two sets of card heads 95 are locked onto the card seat 96. Through the locking action between the mounting plate 1 and the fixed seat 2, the installation of the composite roller bearing and external components is completed.

[0048] At the same time, the forward and reverse screws 92 also drive the ratchet 101 to rotate synchronously. The ratchet 101 drives the two sets of pawls 102 to skip teeth on their teeth. The skipping teeth of the two sets of pawls 102 also causes the two springs 103 to contract at a certain frequency, and drives the dials 105 on the two rotating rods 104 to move back and forth, applying a reverse restriction to the forward and reverse screws 92 to prevent the composite roller bearing from loosening in the reverse direction after installation. When disassembling the composite roller bearing, first... Move the dial 105 outward, and through the two rotating rods 104, drive the two sets of pawls 102 to pull outward from the ratchet 101. After releasing the reverse restriction of the forward and reverse screws 92 on the ratchet 101, first use the hex wrench to drive the forward and reverse screws 92 to reverse through the rotating head 91. The two sets of threaded sleeves 93 drive the chucks 95 on the two support plates 94 to move outward from the chuck 96. After the fixed seat 2 is separated from the mounting plate 1, the damaged composite roller bearing on the fixed seat 2 can be removed for repair.

[0049] During the use of the composite roller bearing, the inner sealing ring 81 and the outer sealing ring 82 seal the inner and outer sides of the outer bearing 7 for oil prevention. The elastic pull ring 83, which is protected by the limiting protrusion 11, elastically binds the inner sealing ring 81 and the outer sealing ring 82, so that the inner sealing ring 81 and the outer sealing ring 82 fit tightly against the inner and outer sides of the outer bearing 7. Then, the sealing cap 86 on the positioning head 85 inserted into the positioning hole 84 provides overall limiting and blocking treatment for the outer sides of the inner bearing 6 and the outer bearing 7, improving the overall sealing firmness between the fixed seat 2, the inner bearing 6 and the outer bearing 7. The convex rib 13 and the inner groove 14 provide anti-detachment treatment between the sealing cap 12 and the pin 5. The two sets of sealing caps 12 seal the two ends of the pin 5 for oil prevention, ensuring the sealing and oil prevention performance of the inner bearing 6. During the rolling of the outer bearing 7, the guide roller 27, which is also subjected to force on the bent arm 26, rotates with the outer bearing 7 and drives the scraping strip 28 on it to rotate and scrape off the dirt adhering to the surface of the outer bearing 7.

[0050] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A detachable composite roller bearing comprising a mounting plate (1) and a fixed seat (2), characterized in that: The fixed seat (2) is fixedly connected with a fixed frame (3) near one side of the mounting plate (1), and the bottom of the fixed frame (3) is fixedly connected with a fixed box (4); The inner cavity of the fixed seat (2) is embedded with an inner bearing (6) through a pin shaft (5), and the outer side of the mounting plate (1) is sleeved with an outer bearing (7) which is composite matched with the inner bearing (6), the inner bearing (6) adopts a symmetrical double-row roller design, and the outer bearing (7) adopts a compact single-row roller design; The fixed seat (2) is provided with a sealing assembly matched with the inner bearing (6) and the outer bearing (7), and the sealing assembly comprises a sealing inner ring (81) embedded in the inner side of the outer bearing (7), and the fixed frame (3) is provided with a dismounting assembly matched with the mounting plate (1) and the fixed seat (2).

2. The demountable composite roller bearing of claim 1, wherein: The sealing assembly further comprises a sealing outer ring (82) embedded in the outer side of the outer bearing (7), and the sealing inner ring (81) and the sealing outer ring (82) are sleeved with an elastic pull ring (83), the outer side of the fixed seat (2) is provided with a positioning hole (84), and the positioning hole (84) is inserted with a positioning head (85), the outer side of the positioning head (85) is fixedly connected with a sealing cover (86) which is limited matched with the inner bearing (6) and the outer bearing (7), and is fixed with the fixed seat (2) through an anti-loose screw.

3. The demountable composite roller bearing of claim 2, wherein: The dismounting assembly comprises a rotating head (91) rotating on the top of the fixed frame (3), and the bottom of the rotating head (91) is fixedly connected with a positive and negative screw rod (92) which is rotationally matched with the fixed box (4), the upper and lower sides of the positive and negative screw rod (92) are both threadedly connected with a threaded sleeve (93), and the threaded sleeve (93) is fixedly connected with a support plate (94), the support plate (94) is fixedly connected with a clamping head (95), and the mounting plate (1) is fixedly connected with a clamping seat (96) which is clamped matched with the clamping head (95).

4. The modular composite roller bearing of claim 3, wherein: The inner side of the sealing inner ring (81) and the sealing outer ring (82) is fixedly connected with a limiting block (11) which is prevented from blocking matched with the elastic pull ring (83), and the two sides of the fixed seat (2) are embedded with a sealing cap (12) which is sleeved matched with the pin shaft (5), the inner circumference of the sealing cap (12) is fixedly connected with a convex rib (13), and the two ends of the pin shaft (5) are circumferentially provided with an inner recess (14) which is clamped with the convex rib (13).

5. The modular composite roller bearing of claim 4, wherein: The upper and lower sides of the fixed frame (3) are provided with T-shaped sliding grooves (15), and the T-shaped sliding grooves (15) are slidingly connected with T-shaped sliding blocks (16) which are fixedly matched with the threaded sleeves (93), and the outer side of the fixed frame (3) is sequentially provided with limiting through grooves (17) from top to bottom, and the two sides of the support plate (94) are provided with limiting sliding openings (18) which are slidingly matched with the limiting through grooves (17).

6. The modular composite roller bearing of claim 5, wherein: The fixed frame (3) is transversely fixed with a guide block (19) near the center of the limiting through groove (17), and the clamping seat (96) is provided with a guide groove (20) which is clamped with the guide block (19) near the center of the fixed frame (3).

7. The modular composite roller bearing of claim 6, wherein: The upper and lower sides of the clamping seat (96) are arrayed with positioning blocks (21), and the inner side of the clamping head (95) is arrayed with positioning grooves (22) which are clamped with the positioning blocks (21).

8. The modular composite roller bearing of claim 7, wherein: The mounting plate (1) is fixed with locking protrusions (23) on both upper and lower sides near the card holder (96), and the outer side of the clamping head (95) is provided with locking through grooves (24) for inserting the locking protrusions (23).

9. The modular composite roller bearing of claim 8, wherein: The rotating head (91) is designed with a six-rib groove, and the fixed frame (3) is provided with a buckle groove on the outer side near the rotating head (91), and a plugging head (25) is clamped in the buckle groove for limiting and protecting the rotating head (91).

10. The modular composite roller bearing of claim 9, wherein: The fixed seat (2) is fixed with bent arms (26) on all around near the fixed frame (3), and the outer side of the bent arm (26) is rotatably connected with a guide roller (27) which is in rolling cooperation with the outer bearing (7) and has a dirt scraping strip (28).

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