A cleaning device for xenogeneic bone repair material

Abstract

The utility model relates to a kind of cleaning device of xenogeneic bone repair material. Including total mounting seat, overturn mounting seat one and unloading hydraulic cylinder are connected on it, it further includes the locking mechanism one installed between total mounting seat and overturn mounting seat one;It further includes cleaning cylinder, and it is provided with draining net cylinder in its inner cavity, it further includes net cylinder drive assembly;It further includes the overturning pivot that overturning is rotatably connected on total mounting seat, overturning mounting seat two is fixedly connected on overturning pivot, overturning hydraulic cylinder is connected between overturning pivot and total mounting seat, it further includes the locking mechanism two installed between overturning pivot and total mounting seat;It further includes drive motor two and several cleaning roller brushes, and it is provided with rotary connection component between drive motor two and several cleaning roller brushes.The utility model can disturb bone repair material and cleaning fluid in the cleaning process, ensure that bone repair material and cleaning fluid are contacted fully, and can automatically drain and unload operation after completing cleaning operation, and operation process is simple.

Description

Technical Field

[0001] This utility model belongs to the field of bone repair material cleaning technology, and in particular relates to a cleaning device for xenogeneic bone repair materials. Background Technology

[0002] Currently, autologous bone, allogeneic bone, and synthetic bone substitutes are commonly used materials for bone defect repair in the treatment of bone defects. These materials typically promote osteoblast growth and bone synthesis, helping damaged bones regain normal function.

[0003] Before being used, bone defect repair materials typically undergo physical and chemical treatments to eliminate antigenicity and reduce or prevent rejection. For bone repair materials, these physical and chemical treatments usually include cleaning using a cleaning device.

[0004] In practical work, it was found that the existing cleaning devices have a relatively simple structure. During use, the bone repair materials are mostly in a static state, and it is impossible to apply enough disturbance to the bone repair materials to ensure sufficient contact with the cleaning solution, which affects the cleaning effect. In addition, after the cleaning operation is completed using the existing cleaning devices, the bone repair materials accumulate in the cleaning tank, and the staff needs to manually or use tools to scoop the materials out of the cleaning solution. The operation process is cumbersome and not conducive to the drainage of the bone repair materials. Therefore, there is an urgent need to design a cleaning device for xenogeneic bone repair materials to solve the above problems. Utility Model Content

[0005] This invention provides a reasonably structured xenogeneic bone repair material cleaning device to solve the technical problems existing in the prior art. This invention can agitate the bone repair material and cleaning solution during the cleaning process to ensure sufficient contact between the bone repair material and the cleaning solution, and can automatically perform draining and unloading operations after the cleaning operation is completed. The operation process is simple.

[0006] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A xenogeneic bone repair material cleaning device includes a main mounting base, a flip mounting base rotatably connected to the main mounting base via a rotating shaft, a discharge hydraulic cylinder pivotally connected between the main mounting base and the flip mounting base rotatably connected to drive the flip mounting base rotatably, a locking mechanism installed between the main mounting base and the flip mounting base rotatably for locking the position of the flip mounting base rotatably, a cleaning cylinder fixedly connected to the flip mounting base rotatably, an outlet and a control valve installed at the bottom of the cleaning cylinder, and a drain screen cylinder rotatably connected to the inner cavity of the cleaning cylinder. The device includes a screen cylinder drive assembly mounted on a tilting mounting base one for driving the drain screen cylinder to rotate; a tilting shaft rotatably connected to a main mounting base, a tilting mounting base two fixedly connected to the tilting shaft, a tilting hydraulic cylinder pivotally connected between the tilting shaft and the main mounting base for driving the tilting mounting base two to tilt; a locking mechanism two mounted between the tilting shaft and the main mounting base for locking the position of the tilting mounting base two; a drive motor two mounted on the tilting mounting base two and several cleaning roller brushes disposed inside the drain screen cylinder, a rotary connection assembly disposed between the drive motor two and the several cleaning roller brushes for driving the several cleaning roller brushes to rotate.

[0007] The advantages and positive effects of this utility model are as follows: This utility model provides a cleaning device for heterogeneous bone repair materials. Through a cleaning cylinder and a draining mesh cylinder, the bone repair materials are immersed in the cleaning solution, and after cleaning, the cleaning cylinder is emptied to drain the material. Since the draining mesh cylinder is rotatably connected to the cleaning cylinder, and with the help of a mesh cylinder drive assembly, the draining mesh cylinder and the material inside it can rotate, thereby disturbing the material and ensuring sufficient contact between the bone repair material and the cleaning solution, improving the cleaning effect. Through the rotating connection assembly and drive motor two, several cleaning rollers can rotate simultaneously, further agitating and washing the bone repair material in the draining mesh cylinder, further improving the cleaning effect. By setting up a discharge hydraulic cylinder and a tilting mounting base one, as well as a tilting hydraulic cylinder and a tilting mounting base two, which are pivotally connected to the main mounting base, the bone repair material can be automatically unloaded after cleaning and emptying the cleaning cylinder, eliminating the need for manual removal of the material from the cleaning solution by personnel or the use of tools, simplifying the operation.

[0008] Preferably, it also includes a cylinder cover plate installed on the bottom surface of the flip mounting base two, with a feed inlet on the cylinder cover plate and a cover fastened at the feed inlet, and a handle installed on the cover; when the piston rod of the flip hydraulic cylinder is in the retracted state, the cylinder cover plate is fastened to the upper open end of the cleaning cylinder.

[0009] Preferably, the mesh cylinder drive assembly includes a reduction gear mounting base fixedly connected to the lower end of the tilting mounting base one, a shaft fixedly connected to the bottom surface of the drain mesh cylinder on the output shaft of the reduction gear mounting base, the shaft penetrating the washing cylinder and being rotatably connected thereto in a sealed manner; it also includes a motor mounting base pivotally connected to the reduction gear mounting base, a screw pivotally connected to the motor mounting base, the screw being locked to the tilting mounting base one by a lock nut, and a drive motor one mounted on the motor mounting base, with a drive transmission pair installed between the output shaft of the drive motor one and the input shaft of the reducer.

[0010] Preferably, the rotary connection assembly includes a gearbox, a gear mounting bracket installed in the inner cavity of the gearbox, and a plurality of auxiliary rotating shafts evenly distributed along the circumference of the gearbox rotatably connected to the gear mounting bracket for mounting a plurality of cleaning roller brushes. A secondary gear is keyed to each auxiliary rotating shaft. The assembly also includes a main rotating shaft installed on the output shaft of the second drive motor, a main gear keyed to the main rotating shaft, and a plurality of auxiliary gears meshing with the main gear. The cleaning roller brushes are mounted on the main rotating shaft.

[0011] Preferably, the locking mechanism includes two sets of rotating connecting seats fixedly mounted on the main mounting base. The rotating shaft mounted on the flip mounting base is rotatably connected to the rotating connecting seats through rolling bearings. A locking disc is fixedly mounted at the end of the rotating shaft. Each locking disc has an arc-shaped hole. The mechanism also includes a locking mounting ring fixedly mounted on the rotating connecting seat. The locking mounting ring and the locking disc are locked together by locking bolts passing through the arc-shaped holes.

[0012] Preferably, the second locking mechanism includes two sets of rotating connecting seats fixedly mounted on the main mounting base. The rotating shaft is rotatably connected to the rotating connecting seats through rolling bearings. A locking disc is fixedly mounted at the end of the rotating shaft. Each locking disc has an arc-shaped hole. The mechanism also includes a locking mounting ring fixedly mounted on the rotating connecting base. The locking mounting ring and the locking disc are locked together by locking bolts passing through the arc-shaped holes.

[0013] Preferably, a movable mounting ring is fixedly connected to the bottom surface of the draining screen cylinder and the bottom surface of the inner cavity of the washing cylinder. The top surface of the movable mounting ring installed on the washing cylinder has several spherical grooves evenly distributed along its circumference, and each spherical groove has a movable ball that rolls in contact with it. The bottom surface of the movable mounting ring installed on the draining screen cylinder has an annular groove with an annular structure that is adapted to the movable ball. Each movable ball is embedded in the annular groove and rolls in contact with it. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the rotary connection component in this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0017] In the diagram: 1. Reduction mounting base; 2. Reducer; 3. Drive transmission pair; 4. Drive motor one; 5. Motor mounting base; 6. Main mounting base; 7. Unloading hydraulic cylinder; 8. Tilting mounting base one; 9. Cleaning cylinder; 10. Draining screen cylinder; 11. Movable mounting ring; 12. Cleaning roller brush; 13. Rotary connecting assembly; 13-1. Secondary gear; 13-2. Gear box; 13-3. Gear mounting bracket; 13-4. Main shaft; 13-5. Main gear; 13-6. Secondary shaft; 14. Cylinder cover plate; 15. Drive motor two; 16. Tilting mounting base two; 17. Tilting shaft; 18. Tilting hydraulic cylinder; 19. Live ball joint; 20. Rotary connecting base; 21. Locking disc; 22. Arc-shaped hole. Detailed Implementation

[0018] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0019] Please see Figure 1 The xenogeneic bone repair material cleaning device of this utility model includes a main mounting base 6, on which a flip mounting base 8 is rotatably connected via a rotating shaft. A discharge hydraulic cylinder 7 is pivotally connected between the main mounting base 6 and the flip mounting base 8 to drive the flip mounting base 8 to flip. Further, an upper hinge seat is fixedly connected to the bottom surface of the flip mounting base 8, and a hinge joint is installed at the end of the piston rod of the discharge hydraulic cylinder 7. The hinge joint and the upper hinge seat are hinged together by a pin, and the cylinder of the discharge hydraulic cylinder 7 is hinged to the lower hinge seat installed on the main mounting base 6 by a pin.

[0020] See further details Figure 3 This embodiment also includes a locking mechanism installed between the main mounting base 6 and the flip mounting base 8, used to lock the position of the flip mounting base 8. The locking mechanism includes two sets of rotating connecting seats 20 fixedly to the main mounting base 6. A rotating shaft mounted on the flip mounting base 8 is rotatably connected to the rotating connecting seats 20 via rolling bearings. A locking disc 21 is fixedly connected to the end of the rotating shaft. Each locking disc 21 has an arc-shaped hole 22. The mechanism also includes a locking mounting ring fixedly to the rotating connecting seat 20. The locking mounting ring and the locking disc 21 are locked together by locking bolts passing through the arc-shaped holes 22. Through the above configuration, the installation stability of the flip mounting base 8 can be further improved.

[0021] like Figure 1As shown, this embodiment also includes a cleaning cylinder 9 fixedly connected to the flip mounting base 8. A liquid outlet is provided at the bottom of the cleaning cylinder 9 and a control valve is installed thereon. The control valve is a ball valve. A draining screen cylinder 10 is provided in the inner cavity of the cleaning cylinder 9 and is rotatably connected thereto. The embodiment also includes a screen cylinder drive assembly installed on the flip mounting base 8 for driving the draining screen cylinder 10 to rotate.

[0022] In addition, movable mounting rings 11 are fixedly connected to the bottom surface of the draining screen cylinder 10 and the bottom surface of the inner cavity of the washing cylinder 9. The top surface of the movable mounting ring 11 installed on the washing cylinder 9 has several spherical grooves evenly distributed along its circumference, and each spherical groove has a movable ball 19 that rolls in contact with it. The bottom surface of the movable mounting ring 11 installed on the draining screen cylinder 10 has an annular groove with an annular structure that is adapted to the movable ball 19, and each movable ball 19 is embedded in the annular groove and rolls in contact with it. In order to further improve the rotational stability of the draining screen cylinder 10, oppositely arranged annular mounting members are fixedly connected to the outer peripheral wall of the inner cavity of the washing cylinder 9 and the outer peripheral wall of the draining screen cylinder 10. On the opposite surfaces of the two oppositely arranged annular mounting members, there are grooves with an arc-shaped cross section, and several balls that roll in contact with the two annular mounting members are arranged in the grooves. In addition, the aforementioned draining mesh cylinder 10, several movable mounting rings 11, several annular mounting parts, and several movable ball bearings 19 are all made of stainless steel.

[0023] like Figure 1 As shown, the aforementioned mesh cylinder drive assembly includes a reduction gear mounting base 1 fixedly connected to the lower end of the tilting mounting base 8. A shaft fixedly connected to the bottom surface of the drain mesh cylinder 10 is mounted on the output shaft of the reduction gear mounting base 1. The shaft passes through the washing cylinder 9 and is rotatably connected to it in a sealed manner. For ease of maintenance, it also includes a motor mounting base 5 pivotally connected to the reduction gear mounting base 1. A screw is pivotally connected to the motor mounting base 5, and the screw is locked to the tilting mounting base 8 by a lock nut. It also includes a drive motor 4 mounted on the motor mounting base 5. A drive transmission pair 3 is installed between the output shaft of the drive motor 4 and the input shaft of the reducer 2. The drive transmission pair 3 includes a drive pulley keyed to the output shaft of the drive motor 4 and a driven pulley keyed to the input shaft of the reducer 2. Several transmission belts are installed between the drive pulley and the driven pulley.

[0024] like Figure 1As shown, this embodiment also includes a tilting shaft 17 rotatably connected to the main mounting base 6, a tilting mounting base 2 16 fixedly connected to the tilting shaft 17, and a tilting hydraulic cylinder 18 pivotally connected between the tilting shaft 17 and the main mounting base 6 for driving the tilting mounting base 2 16 to tilt. It also includes a locking mechanism 2 installed between the tilting shaft 17 and the main mounting base 6 for locking the position of the tilting mounting base 2 16. Furthermore, this embodiment includes a cylinder cover plate 14 installed on the bottom surface of the tilting mounting base 2 16, with a feed inlet on the cylinder cover plate 14 and a cover fastened to the feed inlet. A handle is installed on the cover. When the piston rod of the tilting hydraulic cylinder 18 is in the retracted state, the cylinder cover plate 14 is fastened to the upper opening of the cleaning cylinder 9.

[0025] Two opposing ear plates are fixedly connected to the tilting shaft 17. A hinge joint is installed at the piston rod end of the tilting hydraulic cylinder 18. The hinge joint and the two ear plates are hinged together by a pin. The cylinder of the tilting hydraulic cylinder 18 is hinged to the hinge seat installed on the main mounting base 6 by a pin. In addition, a limiting plate is installed on the outside of the top surface of the tilting mounting base 16 to limit the degree of tilting of the tilting mounting base 16 upward and outward.

[0026] See further Figure 3 The aforementioned locking mechanism 2 includes two sets of rotating connecting seats 20 fixedly mounted on the main mounting base 6. The rotating shaft 17 is rotatably connected to the rotating connecting seats 20 through rolling bearings. A locking disc 21 is fixedly mounted at the end of the rotating shaft 17. Each locking disc 21 has an arc-shaped hole 22. The mechanism also includes a locking mounting ring fixedly mounted on the rotating connecting base 20. The locking mounting ring and the locking disc 21 are locked together by locking bolts passing through the arc-shaped holes 22.

[0027] like Figure 1 As shown, this embodiment also includes a second drive motor 15 mounted on the second flip mounting base 16 and a plurality of cleaning roller brushes 12 disposed inside the draining net cylinder 10. A rotary connection assembly 13 is disposed between the second drive motor 15 and the plurality of cleaning roller brushes 12 for driving the plurality of cleaning roller brushes 12 to rotate.

[0028] like Figure 2As shown, the aforementioned rotary connection assembly 13 includes a gear box 13-2, which is mounted on the bottom surface of the cylinder cover plate 14. A gear mounting bracket 13-3 is fixedly mounted inside the gear box 13-2. Several secondary rotating shafts 13-6, evenly distributed along the circumference of the gear box 13-2, are rotatably connected to the gear mounting bracket 13-3 for mounting several cleaning roller brushes 12. A secondary gear 13-1 is keyed to each of the secondary rotating shafts 13-6. The assembly also includes a main rotating shaft 13-4 mounted on the output shaft of the drive motor 15. A main gear 13-5 is keyed to the main rotating shaft 13-4. Several secondary gears 13-1 mesh with the main gear 13-5. Cleaning roller brushes 12 are also mounted on the main rotating shaft 13-4. In this embodiment, the rotation direction of the cleaning roller brush 12 mounted on the secondary rotating shaft 13-6 is opposite to that of the cleaning roller brush 12 mounted on the main rotating shaft 13-4, thereby improving the cleaning effect of the material. In this embodiment, four sets of the secondary rotating shaft 13-6 are provided.

[0029] In addition, mounting kits are fixed to the lower ends of the main shaft 13-4 and each of the auxiliary shafts 13-6. Each mounting kit and the upper end of the cleaning roller brush 12 are provided with a pin hole extending radially. The mounting kit and the corresponding cleaning roller brush 12 are detachably connected by a pin that passes through the pin hole, which facilitates the periodic replacement of the worn cleaning roller brush 12.

[0030] Working principle:

[0031] In actual operation, before the cleaning operation, the piston rods of the unloading hydraulic cylinder 7 and the tilting hydraulic cylinder 18 are in a retracted state, thus ensuring that several cleaning roller brushes 12 are inside the draining net cylinder 10. Cleaning liquid is injected into the cleaning cylinder 9, and then the cover installed on the cylinder cover plate 14 is opened, and the bone repair material to be cleaned is put into the draining net cylinder 10, so that the bone repair material is immersed in the cleaning liquid. After a certain soaking time, the second drive motor 15 is started, which drives several cleaning roller brushes 12 inside the draining net cylinder 10 to rotate simultaneously, disturbing and cleaning the bone repair material. At the same time, the first drive motor 4 is started, which drives the draining net cylinder 10 to rotate relative to the cleaning cylinder 9, thereby further disturbing the cleaning liquid and bone repair material, so as to improve the cleaning effect.

[0032] After the cleaning operation is completed, all the aforementioned components and parts are shut down. The liquid outlet at the bottom of the cleaning cylinder 9 is opened to drain the cleaning liquid from the cleaning cylinder 9. After the cleaning cylinder 9 is emptied, it is left to stand for a period of time to facilitate the drainage of the material in the drain screen cylinder 10. Then, the tilting hydraulic cylinder 18 is activated. The piston rod of the tilting hydraulic cylinder 18 extends and drives the tilting mounting base 16 to tilt upward, thereby driving several cleaning roller brushes 12 to tilt to the outside of the drain screen cylinder 10. Then, the unloading hydraulic cylinder 7 is activated. The piston rod of the unloading hydraulic cylinder 7 extends and drives the tilting mounting base 18 to tilt upward, thereby driving the cleaning cylinder 9 and the drain screen cylinder 10 to tilt upward. The water mesh cylinder 10 and the mesh cylinder drive assembly synchronously flip upward to the unloading position. In actual operation, a material collection box can be placed at the unloading position to collect the bone repair material poured out from the draining mesh cylinder 10. After the unloading operation is completed, the piston rod of the unloading hydraulic cylinder 7 retracts, thereby driving the cleaning cylinder 9, the draining mesh cylinder 10 and the mesh cylinder drive assembly to reset. Then, the piston rod of the flipping hydraulic cylinder 18 retracts, driving several cleaning roller brushes 12, the rotating connection assembly 13 and the drive motor 15 to reset, and inject cleaning fluid into the cleaning cylinder 9 again to facilitate the subsequent cleaning operation of the bone repair material.

Claims

1. A device for cleaning xenogeneic bone repair materials, characterized in that: The system includes a main mounting base (6), a tilting mounting base (8) rotatably connected to the main mounting base (6) via a rotating shaft, a discharge hydraulic cylinder (7) pivotally connected between the main mounting base (6) and the tilting mounting base (8) for driving the tilting mounting base (8) to tilt, a locking mechanism (1) installed between the main mounting base (6) and the tilting mounting base (8) for locking the position of the tilting mounting base (8), a cleaning cylinder (9) fixed to the tilting mounting base (8), an outlet and a control valve installed at the bottom of the cleaning cylinder (9), a draining screen cylinder (10) rotatably connected to the cleaning cylinder (9), and a screen cylinder drive assembly installed on the tilting mounting base (8) for driving the draining screen cylinder (10) to rotate; and also includes... The system includes a rotating shaft (17) rotatably connected to the main mounting base (6), a rotating mounting base two (16) fixedly connected to the rotating shaft (17), a rotating hydraulic cylinder (18) pivotally connected between the rotating shaft (17) and the main mounting base (6) for driving the rotating mounting base two (16) to rotate, a locking mechanism two installed between the rotating shaft (17) and the main mounting base (6) for locking the position of the rotating mounting base two (16), a drive motor two (15) installed on the rotating mounting base two (16) and a plurality of cleaning roller brushes (12) arranged in the draining net cylinder (10), a rotating connection assembly (13) arranged between the drive motor two (15) and the plurality of cleaning roller brushes (12) for driving the plurality of cleaning roller brushes (12) to rotate.

2. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: It also includes a cylinder cover plate (14) installed on the bottom surface of the flip mounting base (16), with a feed port on the cylinder cover plate (14) and a cover fastened at the feed port, and a handle installed on the cover; when the piston rod of the flip hydraulic cylinder (18) is in the retracted state, the cylinder cover plate (14) is fastened to the upper opening of the cleaning cylinder (9).

3. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: The mesh cylinder drive assembly includes a reduction mounting base (1) fixedly attached to the lower end of the flip mounting base (8), a shaft fixedly attached to the bottom surface of the drain mesh cylinder (10) on the output shaft of the reduction mounting base (1), the shaft passing through the washing cylinder (9) and being rotatably connected to it in a sealed manner; it also includes a motor mounting base (5) pivotally connected to the reduction mounting base (1), a screw pivotally connected to the motor mounting base (5), the screw being locked to the flip mounting base (8) by a lock nut, and a drive motor (4) mounted on the motor mounting base (5), a drive transmission pair (3) being installed between the output shaft of the drive motor (4) and the input shaft of the reducer (2).

4. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: The rotary connection assembly (13) includes a gear box (13-2), a gear mounting bracket (13-3) is installed in the inner cavity of the gear box (13-2), and a number of auxiliary shafts (13-6) evenly distributed along the circumference of the gear box (13-2) are rotatably connected to the gear mounting bracket (13-3) for mounting a number of cleaning roller brushes (12). A secondary gear (13-1) is keyed to each of the auxiliary shafts (13-6). The assembly also includes a main shaft (13-4) installed on the output shaft of the second drive motor (15), a main gear (13-5) is keyed to the main shaft (13-4), and the auxiliary gears (13-1) mesh with the main gear (13-5). The cleaning roller brushes (12) are installed on the main shaft (13-4).

5. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: The locking mechanism includes two sets of rotating connecting seats (20) fixedly attached to the main mounting base (6). The rotating shaft mounted on the flip mounting base (8) is rotatably connected to the rotating connecting seats (20) through rolling bearings. A locking disc (21) is fixedly attached to the end of the rotating shaft. Each locking disc (21) has an arc-shaped hole (22). The mechanism also includes a locking mounting ring fixedly attached to the rotating connecting seat (20). The locking mounting ring and the locking disc (21) are locked together by locking bolts passing through the arc-shaped hole (22).

6. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: The second locking mechanism includes two sets of rotating connecting seats (20) fixedly mounted on the main mounting base (6). The rotating shaft (17) is rotatably connected to the rotating connecting seats (20) through rolling bearings. A locking disc (21) is fixedly mounted at the end of the rotating shaft (17). Each locking disc (21) has an arc-shaped hole (22). The mechanism also includes a locking mounting ring fixedly mounted on the rotating connecting base (20). The locking mounting ring and the locking disc (21) are locked together by a locking bolt passing through the arc-shaped hole (22).

7. The xenogeneic bone repair material cleaning device as described in claim 1, characterized in that: Movable mounting rings (11) are fixedly connected to the bottom surface of the draining screen cylinder (10) and the bottom surface of the inner cavity of the washing cylinder (9). The top surface of the movable mounting ring (11) installed on the washing cylinder (9) is provided with several spherical grooves evenly distributed along its circumference. Each spherical groove is embedded with a movable ball (19) that rolls in contact with it. The bottom surface of the movable mounting ring (11) installed on the draining screen cylinder (10) is provided with an annular groove that is adapted to the movable ball (19). Each movable ball (19) is embedded in the annular groove and rolls in contact with it.

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