Bearing wear performance detection device

Abstract

The invention relates to the technical field of bearing wear detection, and mainly relates to a bearing wear performance detection device, which comprises a detection table for placing an inner ring and an outer ring of a bearing, a rotating motor mounted on the detection table, and a rotating shaft mounted on the rotating motor, a rotating rod is fixed to the output end of the rotating motor through a coupler, a first electric push rod is fixed to the bottom of the rotating rod, a connecting base is fixed to the outer end of the first electric push rod, a rotating frame is rotationally installed on the outer side of the connecting base through a bearing, a baffle is fixed to one side of the connecting base, and a magnetic attraction block attached to the rotating frame is fixed to the other side of the connecting base; a fluorescent agent is sprayed to the inner ring and the outer ring of the bearing through the designed spraying unit, the fluorescent agent permeates into surface opening defects, and the wiping unit is matched to remove the fluorescent agent remaining on the outer walls of the inner ring and the outer ring, so that the fluorescent agent remaining in the defects is reserved, and the abrasion degree of the bearing can be obviously found.

Description

Technical Field

[0001] The invention relates to the technical field of bearing wear detection, and in particular to a bearing wear performance detection device. Background Art

[0002] A bearing is a mechanical component used to support and reduce friction in rotating or reciprocating motion. It is generally composed of an inner ring, an outer ring, rolling elements, and a cage.

[0003] During the operation of the bearing, the rolling element and the raceway are subjected to periodic contact stress. Under long-term repeated action, tiny cracks will appear on the surface of the material. If there are impurities such as dust and sand in the working environment of the bearing, or if the lubricating oil contains abrasive particles such as metal debris, these particles will enter between the rolling element and the raceway, which will also cause bearing wear. The existing methods for testing the wear performance of bearings mainly include visual method, magnetic particle detection and measurement. The visual method has low detection accuracy and relies entirely on human visual observation. The magnetic particle method and measurement method have requirements for the bearing size. When the bearing is a large-size bearing used on large equipment, the magnetic particle method requires more magnetic powder, and the measurement method has more measurement values, which requires personnel to spend more time measuring, making the detection efficiency low. Summary of the invention

[0004] The purpose of the present invention is to provide a bearing wear performance detection device to solve the problem that a large amount of magnetic powder and manpower are required when inspecting large-sized bearings mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bearing wear performance detection device, comprising a detection table for placing an inner ring and an outer ring of a bearing, a slide groove is provided on the detection table, a positioning column is installed in the slide groove, and also comprises a rotating motor installed on the detection table, a rotating rod is fixed to the output end of the rotating motor through a coupling, and an electric push rod 1 is fixed to the bottom of the rotating rod, a connecting seat is fixed to the outer end of the electric push rod 1, a rotating frame is rotatably installed on the outer side of the connecting seat through a bearing, and a baffle is fixed on one side of the connecting seat, and a magnetic block that fits the rotating frame is fixed on the other side; and a docking ring installed on the rotating frame, a spray unit is inserted in the docking ring, and the spray unit is used to spray a fluorescent agent between the inner ring and the outer ring, and a driving member for driving the spray unit to rise and fall is installed on the connecting seat; and a wiping unit installed on the rotating frame, and the fluorescent agent between the inner ring and the outer ring is removed by the wiping unit.

[0006] Preferably, the spray unit includes a lifting column slidably inserted in the docking ring, a tooth plate connected to the driving member is fixed on the outer side of the lifting column, and a track groove is opened in the lifting column, a spray rod is slidably inserted in the lifting column, and a column slidably connected to the track groove is fixed on the outer side of the spray rod, a spray ring is fixed to the bottom of the spray rod, and a hose is fixed to the top of the spray rod, an elastic member abutting against the lifting column is installed at the bottom of the spray rod, and an abutting member is installed on the top of the spray rod.

[0007] Preferably, the elastic member comprises a bottom plate fixed to the bottom of the lifting column, and the outer side of the spray rod is sleeved with an extrusion spring that abuts against the bottom plate and the spray ring.

[0008] Preferably, the abutting member comprises an abutting plate fixed on the top of the spray rod, and a limiting plate and a clamping plate are fixed on the rotating frame.

[0009] Preferably, the driving member includes a driving motor fixed on a connecting seat, a driving gear meshing with the tooth plate is fixed to the output end of the driving motor, a transmission rod is fixed to the outer side of the driving gear, and a docking groove is provided on the outer side of the transmission rod, and a tooth block adapted to the docking groove is fixed on the bottom plate.

[0010] Preferably, the wiping unit includes two electric push rods fixed to the rotating frame, a connecting plate is fixed to the outer end of the two electric push rods, and a spray pipe is rotatably installed on the connecting plate, a plastic bag is fixed to the outer end of the spray pipe, and a spray hole is opened on the outside of the plastic bag, a hose for feeding is rotatably installed on the spray pipe, and a rotating part for driving the spray pipe to rotate is installed on the connecting plate.

[0011] Preferably, the rotating member comprises a rotating motor fixed on the connecting plate, a rotating gear is fixed to the output end of the rotating motor, and a transmission gear meshing with the rotating gear is fixed to the outer side of the spray pipe.

[0012] Preferably, an end plate is fixed to the top of the rotating rod, and two infusion pumps are installed on the end plate. The two infusion pumps are respectively connected to the spray pipe and the spray pipe through hoses, and the outer end of the infusion pump is connected to the liquid supply equipment through a hose.

[0013] Preferably, a fluff layer is provided on the outer side of the plastic bag.

[0014] Preferably, the outer side of the tooth plate fits with the inner wall of the notch of the docking ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention sprays fluorescent agent on the inner and outer rings of the bearing through a designed spray unit, and uses the fluorescent agent to penetrate into the surface opening defects, and then cooperates with the wiping unit to remove the residual fluorescent agent on the outer walls of the inner and outer rings, thereby retaining the residual fluorescent agent in the defects, and being able to more clearly find the wear degree of the bearing; The driving member designed in the present invention can drive the spraying unit to be raised and lowered, and can be conveniently switched between the spraying unit and the wiping unit, thereby improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention and the bearing docking structure; Figure 2 It is a schematic diagram of the structure of the bearing of the present invention after partial section; Figure 3 It is the front view of the present invention; Figure 4 It is a schematic diagram of the overall structure of the present invention; Figure 5 This is a schematic diagram of the connection between the spray unit and the connection seat of the present invention; Figure 6 This is a schematic diagram of the structure of the spray unit of the present invention being located in a bearing raceway; Figure 7 It is a schematic diagram of the structure of the spraying ring in the spraying unit of the present invention after rotation; Figure 8 This is a schematic diagram of the spray unit of the present invention in an upward moving state; Fig. 9 It is a schematic diagram of the state after the docking groove and the gear block of the present invention are docked; Fig.10 This is a schematic diagram of the state after the rotating frame of the present invention rotates 90°; Fig.11 It is a schematic diagram of the plug post and the track groove of the present invention.

[0017] In the figure: 1. test table; 2. slide; 3. positioning column; 4. rotating motor; 5. rotating rod; 6. electric push rod 1; 7. connecting seat; 8. rotating frame; 9. baffle; 10. magnetic block; 11. docking ring; 12. spray unit; 13. driving part; 14. wiping unit; 15. lifting column; 16. tooth plate; 17. track groove; 18. spray rod; 19. plug column; 20. spray ring; 21. elastic part; 22. counter part; 23. Bottom plate; 24. Extrusion spring; 25. Counter plate; 26. Limit plate; 27. Card plate; 28. Driving motor; 29. ​​Driving gear; 30. Transmission rod; 31. Docking groove; 32. Gear block; 33. Electric push rod 2; 34. Connecting plate; 35. Spraying pipe; 36. Plastic bag; 37. Spraying hole; 38. Rotating part; 39. Rotating motor; 40. Rotating gear; 41. Transmission gear; 42. End plate; 43. Infusion pump. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1 - Figure 5 , a bearing wear performance detection device shown in the figure includes a detection table 1 for placing the inner ring and outer ring of the bearing, a slide groove 2 is opened on the detection table 1, a positioning column 3 is installed in the slide groove 2, and also includes a rotating motor 4 installed on the detection table 1, a rotating rod 5 is fixed to the output end of the rotating motor 4 through a coupling, an electric push rod 6 is fixed to the bottom of the rotating rod 5, a connecting seat 7 is fixed to the outer end of the electric push rod 6, a rotating frame 8 is installed on the outer side of the connecting seat 7 through the bearing rotation, a baffle 9 is fixed on one side of the connecting seat 7, and a magnetic block 10 that fits the rotating frame 8 is fixed on the other side; and a docking ring 11 installed on the rotating frame 8, a spray unit 12 is inserted in the docking ring 11, the spray unit 12 is used to spray the fluorescent agent between the inner ring and the outer ring, and a driving member 13 for driving the spray unit 12 to rise and fall is installed on the connecting seat 7; and a wiping unit 14 installed on the rotating frame 8, the fluorescent agent between the inner ring and the outer ring is removed by the wiping unit 14; In this scheme, the inner ring and the outer ring of the bearing are placed concentrically on the inspection table 1, and are positioned with the help of the positioning column 3. Then, the electric push rod 6 is used to drive the connecting seat 7 to move to the upper part between the inner ring and the outer ring, and the driving member 13 drives the spray unit 12 to move down to the raceway between the inner ring and the outer ring. Then, with the help of the rotating motor 4, the rotating rod 5 and the spray unit 12 are driven to rotate to spray the fluorescent agent on the inner wall of the inner ring and the outer ring. Then, the spray unit 12 rises through the driving member 13, and the rotating frame 8 is rotated until the wiping unit 14 is in the raceway between the inner ring and the outer ring, and the residual fluorescent agent on the inner wall of the inner ring and the outer ring is removed, which is convenient for observing the fluorescent agent that has penetrated into the surface opening defect, so that the bearing wear condition can be clearly observed; It should be noted that the wiping unit 14 can effectively wipe the fluorescent agent attached to the inner ring and the outer ring, and the fluorescent agent that penetrates into the gaps in the inner walls of the inner ring and the outer ring will adhere to the gaps. Therefore, after wiping, personnel can still clearly observe the degree of defects in the bearing raceway through the residual fluorescent agent.

[0020] For further information, see Figure 5 - Fig.11The spray unit 12 includes a lifting column 15 slidably inserted in the docking ring 11, a tooth plate 16 connected to the driving member 13 is fixed on the outer side of the lifting column 15, a track groove 17 is provided in the lifting column 15, a spray rod 18 is slidably inserted in the lifting column 15, a plug column 19 slidably plugged in the track groove 17 is fixed on the outer side of the spray rod 18, a spray ring 20 is fixed at the bottom of the spray rod 18, a hose is fixed on the top of the spray rod 18, an elastic member 21 abutting against the lifting column 15 is installed at the bottom of the spray rod 18, and an abutting member 22 is installed at the top of the spray rod 18; It should be noted that when the plug 19 moves along the track groove 17, it can drive the spray rod 18 to rotate, so that the spray ring 20 rotates 90°, which is more convenient to insert between the inner ring and the outer ring. At the same time, in order to enable the lifting column 15 to move stably in the docking ring 11, the outer side of the tooth plate 16 is designed to fit the inner wall of the notch of the docking ring 11.

[0021] The elastic member 21 includes a bottom plate 23 fixed to the bottom of the lifting column 15, and an extrusion spring 24 is sleeved on the outer side of the spray rod 18 to resist the bottom plate 23 and the spray ring 20. The existence of the extrusion spring 24 enables the spray rod 18 to maintain a downwardly extended state without being affected by external forces, so that the angle of the spray ring 20 will not change easily. At the same time, the abutment member 22 includes an abutment plate 25 fixed on the top of the spray rod 18, and a limit plate 26 and a clamping plate 27 are fixed on the rotating frame 8. After the abutment plate 25 of the spray rod 18 abuts against the limit plate 26, the lifting column 15 continues to move downward, which can drive the spray rod 18 to rotate accordingly.

[0022] For further information, see Figure 5 - Fig. 9 The driving member 13 includes a driving motor 28 fixed on the connecting seat 7, a driving gear 29 meshing with the tooth plate 16 is fixed to the output end of the driving motor 28, a transmission rod 30 is fixed to the outer side of the driving gear 29, a docking groove 31 is provided on the outer side of the transmission rod 30, and a tooth block 32 adapted to the docking groove 31 is fixed on the bottom plate 23. The driving motor 28 drives the driving gear 29 to rotate, thereby causing the tooth plate 16 and the lifting column 15 to rise and fall accordingly.

[0023] In this solution, the driving member 13 drives the spray unit 12 to rise and fall: First, the driving motor 28 rotates to drive the driving gear 29 to rotate, thereby driving the corresponding lifting and lowering of the toothed plate 16, so that the lifting column 15 is lifted and lowered in the docking ring 11. When descending, the spray ring 20 will be sent between the inner ring and the outer ring. After entering the raceway of the inner ring and the outer ring, the abutting plate 25 at the outer end of the spray rod 18 will abut against the limit plate 26 first. Then, as the lifting column 15 continues to move downward, the spray rod 18 will rotate accordingly, so that the spray ring 20 rotates 90° in the raceway, so that the spray nozzle on the outside of the spray ring 20 is aligned with the outer wall of the inner ring and the outer ring, and then the rotating motor 4 drives the rotating rod 5 to rotate, so that the spray ring 20 rotates along the raceway, so that the fluorescent agent is sprayed on the outer wall of the inner ring and the outer ring; After spraying, Figure 7 - Fig. 9 , the driving motor 28 rotates in the opposite direction, so that the tooth plate 16 moves up accordingly. When moving up, the abutting plate 25 on the spray rod 18 abuts against the card plate 27, so the spray rod 18 does not move. The upward movement of the lifting column 15 will drive the corresponding rotation of the spray rod 18 until it rotates 90°. At this time, the abutting plate 25 also separates from the card plate 27. Then, the lifting column 15 moves up, driving the spray rod 18 and the spray ring 20 to move up synchronously until they are separated from the bearing; Finally, if Fig. 9 and Fig.10 As shown, the lifting column 15 continues to move upward until the tooth block 32 abuts against the docking groove 31. At this time, the driving motor 28 drives the transmission rod 30 to continue to rotate, which will cause the lifting column 15 as a whole and the rotating frame 8 to rotate 90° until the rotating frame 8 abuts against the baffle 9. At this time, the wiping unit 14 will be rotated downward to facilitate the wiping unit 14 to enter the bearing for wiping.

[0024] After wiping is completed, the driving motor 28 is rotated to reset the rotating frame 8. After the rotating frame 8 is reset, it will be positioned by the magnetic block 10 to ensure that the rotating frame 8 can remain fixed without external force, and then drive the spraying unit 12 to lift and spray.

[0025] In this solution, the spray rod 18 first descends and then rotates between the inner ring and the outer ring. After spraying, it rotates in the opposite direction and then moves upward until it drives the rotating frame 8 to rotate as a whole. This makes the spraying operation of the spray unit 12 more convenient, and also facilitates the conversion between the spray unit 12 and the wiping unit 14.

[0026] For further information, see Figure 6 - Fig.10The wiping unit 14 includes an electric push rod 33 fixed to the rotating frame 8, a connecting plate 34 is fixed to the outer end of the electric push rod 33, a spray pipe 35 is rotatably mounted on the connecting plate 34, a plastic bag 36 is fixed to the outer end of the spray pipe 35, a spray hole 37 is opened on the outer side of the plastic bag 36, a hose for feeding is rotatably mounted on the spray pipe 35, and a rotating member 38 for driving the spray pipe 35 to rotate is installed on the connecting plate 34.

[0027] In this solution, the principle of using the wiping unit 14 to wipe between the inner ring and the outer ring of the bearing is as follows: First, after the rotating frame 8 is driven to rotate, the wiping unit 14 is aligned between the inner ring and the outer ring of the bearing, and the electric push rod 33 is extended to allow the plastic bag 36 to enter the raceway of the bearing. Then, liquid is supplied to the plastic bag 36 through an external liquid supply device, so that the spray hole 37 on the plastic bag 36 sprays cleaning liquid outward to clean the residual fluorescent agent on the inner ring and the outer ring; It should also be noted that, since the plastic bag 36 itself has a certain elasticity, when the liquid supply is greater than the liquid discharge, the plastic bag 36 will expand, thereby fitting with the inner ring and outer ring walls. When the plastic bag 36 moves along the raceway, it can play a good wiping role. At the same time, in order to improve the wiping effect, a fluff layer is provided on the outside of the plastic bag 36.

[0028] In this solution, an end plate 42 is fixed on the top of the rotating rod 5, and two infusion pumps 43 are installed on the end plate 42. The two infusion pumps 43 are respectively connected to the spray pipe 35 and the spray pipe through a hose. The outer end of the infusion pump 43 is connected to the liquid supply equipment through a hose. The infusion pump 43 is used to transport the fluorescent agent and the cleaning liquid. In order to avoid the entanglement of the hose, the movement of the plastic bag 36 and the spray ring 20 in the raceway can be controlled by rotating the rotating motor 4 forward one circle and then reverse one circle.

[0029] In this solution, the method for detecting bearing wear performance includes the following steps: In the first step, the personnel first place the inner ring and outer ring of the bearing concentrically on the test table 1, and then use the positioning column 3 to position them; The second step is to drive the connecting seat 7 through the electric push rod 16 so that the bottom of the spray unit 12 is located between the inner and outer rings of the bearing; In the third step, the driving member 13 provides power to drive the spray ring 20 at the bottom of the spray unit 12 to move down into the bearing raceway, and the rotating motor 4 rotates to start spraying the fluorescent agent on the bearing raceway; Step 4: After spraying is completed, the spraying unit 12 is moved upward by the driving member 13, and the rotating frame 8 is driven to rotate so that the bottom of the wiping unit 14 is between the inner and outer rings of the bearing; Step 5: The plastic bag 36 at the bottom of the wiping unit 14 is rotated in the raceway, so that the residual fluorescent agent on the outer wall of the raceway can be effectively wiped off, while the fluorescent agent in the notch on the bearing raceway cannot be contacted and wiped, so it will remain; In the sixth step, the wiping unit 14 is removed, and the personnel remove the inner and outer rings of the bearing and illuminate them with a specific light to make the fluorescent agent glow. The degree of glow can be clearly observed through the degree of wear in the bearing, making the detection more convenient.

[0030] Example 2: Please refer to Figure 7 - Fig.10 This embodiment further explains the first embodiment, and the difference lies in that one of the embodiments of the rotating member 38 is optimized and disclosed.

[0031] Specifically, the rotating member 38 includes a rotating motor 39 fixed on the connecting plate 34, a rotating gear 40 is fixed to the output end of the rotating motor 39, and a transmission gear 41 meshing with the rotating gear 40 is fixed to the outer side of the spray pipe 35; It should be noted that: after the plastic bag 36 is in the rolling track, the plastic bag 36 is expanded by supplying liquid, and then moves along the rolling track. During the movement, the rotating motor 39 provides power to drive the rotating gear 40 to rotate, so that the transmission gear 41 on the outside of the spray pipe 35 rotates accordingly, thereby driving the spray pipe 35 and the plastic bag 36 to rotate accordingly, realizing self-rotation in the rolling track, and improving the wiping effect of the rolling track.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bearing wear performance detection device, comprising: A test bench (1) for placing the inner ring and outer ring of a bearing, wherein a slide groove (2) is provided on the test bench (1), and a positioning column (3) is installed in the slide groove (2); It is characterized by further comprising: A rotating motor (4) is mounted on the inspection table (1), wherein the output end of the rotating motor (4) is fixed with a rotating rod (5) via a coupling, and an electric push rod (6) is fixed to the bottom of the rotating rod (5), a connecting seat (7) is fixed to the outer end of the electric push rod (6), a rotating frame (8) is rotatably mounted on the outer side of the connecting seat (7) via a bearing, and a baffle (9) is fixed to one side of the connecting seat (7), and a magnetic block (10) that fits the rotating frame (8) is fixed to the other side; and, a docking ring (11) mounted on the rotating frame (8), a spraying unit (12) being inserted in the docking ring (11), the spraying unit (12) being used to spray the fluorescent agent between the inner ring and the outer ring, and a driving member (13) being mounted on the connecting seat (7) for driving the spraying unit (12) to move up and down; and, A wiping unit (14) is mounted on the rotating frame (8), and the fluorescent agent between the inner ring and the outer ring is removed by the wiping unit (14).

2. A bearing wear performance detection device according to claim 1, characterized in that: The spraying unit (12) comprises a lifting column (15) slidably inserted in the docking ring (11), a tooth plate (16) connected to the driving member (13) is fixed on the outer side of the lifting column (15), and a track groove (17) is provided in the lifting column (15), a spraying rod (18) is slidably inserted in the lifting column (15), and a plug column (19) slidably plugged in the track groove (17) is fixed on the outer side of the spraying rod (18), a spraying ring (20) is fixed at the bottom of the spraying rod (18), and a hose is fixed at the top of the spraying rod (18), an elastic member (21) abutting against the lifting column (15) is installed at the bottom of the spraying rod (18), and an abutting member (22) is installed at the top of the spraying rod (18).

3. A bearing wear performance detection device according to claim 2, characterized in that: The elastic member (21) comprises a bottom plate (23) fixed to the bottom of the lifting column (15), and the outer side of the spray rod (18) is sleeved with a compression spring (24) that abuts against the bottom plate (23) and the spray ring (20).

4. A bearing wear performance detection device according to claim 2, characterized in that: The abutting member (22) comprises an abutting plate (25) fixed on the top of the spray rod (18), and a limiting plate (26) and a clamping plate (27) are fixed on the rotating frame (8).

5. A bearing wear performance detection device according to claim 3, characterized in that: The driving member (13) comprises a driving motor (28) fixed on the connecting seat (7); a driving gear (29) meshing with the toothed plate (16) is fixed to the output end of the driving motor (28); a transmission rod (30) is fixed to the outer side of the driving gear (29); a docking groove (31) is formed on the outer side of the transmission rod (30); and a tooth block (32) matching the docking groove (31) is fixed to the bottom plate (23).

6. A bearing wear performance detection device according to claim 2, characterized in that: The wiping unit (14) comprises an electric push rod (33) fixed to the rotating frame (8), a connecting plate (34) being fixed to the outer end of the electric push rod (33), a material spraying pipe (35) being rotatably mounted on the connecting plate (34), a plastic bag (36) being fixed to the outer end of the material spraying pipe (35), a material spraying hole (37) being provided on the outer side of the plastic bag (36), a hose for feeding material being rotatably mounted on the material spraying pipe (35), and a rotating member (38) for driving the material spraying pipe (35) to rotate being mounted on the connecting plate (34).

7. A bearing wear performance detection device according to claim 6, characterized in that: The rotating member (38) comprises a rotating motor (39) fixed on the connecting plate (34), a rotating gear (40) being fixed to the output end of the rotating motor (39), and a transmission gear (41) meshing with the rotating gear (40) being fixed to the outer side of the spray pipe (35).

8. A bearing wear performance detection device according to claim 6, characterized in that: An end plate (42) is fixed to the top of the rotating rod (5), and two infusion pumps (43) are installed on the end plate (42). The two infusion pumps (43) are connected to the spray pipe (35) and the spray pipe respectively through hoses, and the outer end of the infusion pump (43) is connected to the liquid supply device through the hose.

9. A bearing wear performance detection device according to claim 6, characterized in that: A fluff layer is provided on the outside of the plastic bag (36).

10. A bearing wear performance detection device according to claim 2, characterized in that: The outer side of the tooth plate (16) fits into the inner wall of the notch of the docking ring (11).

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