Wire passing device
By introducing an eccentric component and an adjustment component into the wire guide, combined with an elastic element and a guide groove, precise adjustment of the moving wheel is achieved, solving the problems of complex adjustment and insufficient precision in the existing technology, and improving operating efficiency and accuracy.
Patent Information
- Application Number
- CN202423003027.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing wire guides require repeated adjustments when adjusting the roller distance, making it difficult to achieve consistent clamping accuracy each time, resulting in complex operation and low efficiency.
By combining an eccentric component with an adjustment component, the moving wheel is pushed closer to or away from the fixed wheel by rotation. With the help of elastic elements and guide groove structure, the moving wheel can be precisely adjusted, simplifying the operation process.
It improves the adjustment precision and operational efficiency of the moving wheels, ensures the accuracy and stability of each clamping, and simplifies the steps of repeatedly clamping the same wire.
Smart Images

Figure CN223513709U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wire production equipment technology, specifically to a wire guide. Background Technology
[0002] In the fields of wire cutting equipment and wire manufacturing, wire guides are crucial components used to ensure that wires pass smoothly and accurately through each processing step. The main functions of a wire guide are to guide, support, and position the wire to guarantee its straightness, tension, and positional accuracy. Existing wire guides only adjust the distance between rollers using a lead screw structure. When repeatedly clamping the same wire, multiple adjustments are required, and it is difficult to achieve consistent clamping accuracy each time. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a wire guide that can effectively improve the adjustment accuracy.
[0004] This utility model embodiment provides a cable guide, which includes:
[0005] Motherboard;
[0006] Fixed wheels and movable wheels are arranged opposite to each other on the surface of the main board, and the movable wheels are movable in a direction away from or close to the fixed wheels;
[0007] An eccentric component abuts against the side of the movable wheel away from the fixed wheel, and the eccentric component rotates to push the movable wheel toward the side of the fixed wheel;
[0008] An adjusting component, connected to an eccentric component, is configured to drive the eccentric component to move toward one side of the fixed wheel, and the eccentric component pushes the moving wheel to move synchronously toward one side of the fixed wheel.
[0009] An elastic element, connected between the movable wheel and the fixed wheel, is configured to push the movable wheel toward the side away from the fixed wheel to reset.
[0010] Furthermore, the motherboard is provided with guide grooves, the openings of which are located on the motherboard surface. The adjustment components include:
[0011] The drive component is rotated on the side of the main board away from the fixed wheel;
[0012] A guide rod is set inside the guide groove. One end of the guide rod is rotatably connected to the groove wall of the guide groove, and the other end is connected to the driving component.
[0013] The connector is threaded onto the outside of the guide rod, and the eccentric assembly is rotatably connected above the connector.
[0014] The drive component is configured to drive the guide rod to rotate. When the guide rod rotates, the connecting component moves along the guide rod and drives the eccentric component to move. At the same time, the eccentric component pushes the moving wheel to move.
[0015] Furthermore, the guide rod includes a first part and a second part connected axially, the first part being provided with external threads, and the connector being threadedly connected to the first part;
[0016] The adjustment assembly also includes a slider, which is slidably connected to the second part, and a movable wheel is connected to the slider.
[0017] Furthermore, the elastic element is sleeved on the outside of the second part, with one end of the elastic element abutting against the groove wall of the guide groove and the other end abutting against the slider.
[0018] Furthermore, the outer side of the drive component is provided with anti-slip texture and scale.
[0019] Furthermore, the eccentric component includes a rotating wheel and a rotating shaft. The center of the rotating wheel does not coincide with the center of the rotating shaft. The rotating shaft is connected to a connecting piece, and the outer circumferential surface of the rotating wheel abuts against the moving wheel.
[0020] Furthermore, the cable guide also includes a first pad and a second pad. The first pad is movably connected to the motherboard, and the second pad is fixedly connected to the end of the motherboard away from the eccentric component. A fixed wheel is rotatably connected to the second pad, and a movable wheel is rotatably connected to the side of the first pad near the fixed wheel. The movable wheel abuts against the first pad.
[0021] Furthermore, a contoured surface is provided on the side of the first pad that abuts against the rotating wheel, and the contoured surface is fitted and engaged with the outer peripheral surface of the part where the farthest point of the rotating wheel is located.
[0022] Furthermore, a limiting component is provided on the side of the first pad closest to the main board, and a limiting groove is provided on the main board parallel to the guide groove, with the limiting component and the limiting groove being movably connected.
[0023] Furthermore, the side of the movable wheel is provided with a first annular groove, and the side of the fixed wheel is provided with a second annular groove. The first annular groove and the second annular groove have the same structure.
[0024] This utility model provides a wire guide, which includes a main board and a fixed wheel and a movable wheel disposed opposite to each other on the surface of the main board. The movable wheel is movable in a direction away from or close to the fixed wheel. The wire guide also includes an eccentric component and an adjusting component. The eccentric component abuts against the side of the movable wheel away from the fixed wheel and pushes the movable wheel toward the side of the fixed wheel by rotation. The adjusting component is connected to the eccentric component and can drive the eccentric component to move toward the side of the fixed wheel. In turn, the adjusting component can push the movable wheel toward the side of the fixed wheel through the eccentric component, so that the movable wheel is close to the fixed wheel to clamp the wire. An elastic element is also provided between the movable wheel and the fixed wheel, which can push the movable wheel to move toward the side away from the fixed wheel to reset. In this wire guide, the eccentric component is disposed on the adjusting component, which can further adjust the position of the movable wheel and improve the adjustment accuracy. Attached Figure Description
[0025] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
[0026] Figure 1 This is a schematic diagram of the overall structure of the wire guide according to an embodiment of the present utility model;
[0027] Figure 2 This is an assembly diagram of the motherboard and adjustment components according to an embodiment of the present utility model;
[0028] Figure 3 This is a diagram showing the relative positions of the moving wheel, the first pad, the fixed wheel, and the second pad in an embodiment of this utility model.
[0029] Figure 4 This is a cross-sectional view of the wire guide according to an embodiment of the present utility model.
[0030] Figure label:
[0031] 10-Main board; 11-Guide groove; 12-Limiting groove; 20-Moving wheel; 21-Following surface; 22-First pad; 23-Limiting component; 24-First annular groove; 30-Fixed wheel; 31-Second pad; 32-Second annular groove; 40-Eccentric component; 41-Rotating wheel; 411-Farthest point; 42-Rotating shaft; 50-Adjusting component; 51-Drive component; 511-Anti-slip texture; 512-Scale; 52-Guide rod; 521-First part; 522-Second part; 53-Connector; 54-Slider; 60-Elastic component. Detailed Implementation
[0032] The present application is described below based on embodiments, but it is not limited to these embodiments. In the detailed description of the present application below, certain specific details are described in detail. Those skilled in the art can fully understand the present application without these details. To avoid obscuring the substance of the present application, well-known methods, processes, flows, elements, and circuits are not described in detail.
[0033] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.
[0034] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0035] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".
[0036] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0037] Figure 1 This is a schematic diagram of the overall structure of the wire guide according to an embodiment of this application. (Refer to...) Figure 1 The wire guide in this embodiment includes a main board 10, a movable wheel 20, a fixed wheel 30, an eccentric assembly 40, and an adjustment assembly 50. The movable wheel 20 and the fixed wheel 30 are disposed opposite each other on the surface of the main board 10. The movable wheel 20 is movable in a direction approaching or away from the fixed wheel 30. The eccentric assembly 40 abuts against the side of the movable wheel 20 away from the fixed wheel 30, and the eccentric assembly 40 can rotate to push the movable wheel 20 toward the fixed wheel 30. The adjustment assembly 50 is used to adjust the movement of the eccentric assembly 40, which further pushes the movable wheel 20 to move synchronously toward the fixed wheel 30, thereby allowing the movable wheel 20 and the fixed wheel 30 to approach each other to clamp and stabilize the wire. (Refer to...) Figure 1The wire guide also includes an elastic element 60, which is disposed between the movable wheel 20 and the fixed wheel 30. The elastic element 60 can push the movable wheel 20 to move away from the fixed wheel 30, so that the movable wheel 20 remains in contact with the eccentric component 40, thereby ensuring that the adjustment component 50 and the eccentric component 40 adjust the movable wheel 20.
[0038] Reference Figure 2 The motherboard 10 has a guide groove 11, and the opening of the guide groove 11 is located on the surface of the motherboard 10. (See reference...) Figure 2 The guide groove 11 is configured as a cuboid, with its long side aligned with the moving direction of the movable wheel 20. (Refer to...) Figure 2 and Figure 4 The adjustment assembly 50 includes a drive member 51, a guide rod 52, and a connector 53. The drive member 51 is rotatably positioned on the side of the main plate 10 away from the fixed wheel 30. The guide rod 52 is disposed within the guide groove 11. (See reference...) Figure 4 One end of the guide rod 52 is rotatably connected to the wall of the guide groove 11, and the other end is connected to the driving component 51, thereby enabling the guide rod 52 to rotate via the driving component 51. (Refer to...) Figure 4 The connector 53 is threaded onto the outside of the guide rod 52, and is slidably engaged in the guide groove 11 to prevent itself from rotating. When the guide rod 52 is rotated by the drive member 51, the connector 53 moves relative to the main board 10 along the guide rod 52. The eccentric assembly 40 is rotatably connected above the connector 53. When the connector 53 moves, it synchronously drives the eccentric assembly 40 to move, thereby pushing the moving wheel 20 toward the fixed wheel 30.
[0039] Reference Figure 2 and Figure 4 The guide rod 52 includes a first part 521 and a second part 522 connected axially. The first part 521 is provided with external threads and is located at one end of the guide rod 52 near the drive member 51. The connector 53 is threadedly connected to the first part 521. The second part 522 is configured as a slide rod and is located at the other end of the guide rod 52. The moving wheel 20 is slidably connected to the second part 522. The eccentric assembly 40 and the moving wheel 20 are respectively connected to the guide rod 52, which ensures that the moving direction of the moving wheel 20 will not deviate when the eccentric assembly 40 pushes the moving wheel 20.
[0040] Reference Figure 2 and Figure 4The adjusting assembly 50 also includes a slider 54, which is slidably connected to the second part 522 and is engaged within the guide groove 11 to prevent itself from rotating with the guide rod 52. The slider 54 has a through hole to fit over the outer side of the second part 522, and the moving wheel 20 is connected to the slider 54. An elastic member 60 is fitted over the outer side of the second part 522, and is located on the side of the slider 54 away from the first part 521. One end of the elastic member 60 abuts against the slider 54, and the other end abuts against the wall of the guide groove 11. In a compressed state, the elastic member 60 provides a thrust to the slider 54 in the direction of the connecting member 53, causing the slider 54 to drive the moving wheel 20 to move towards the eccentric assembly 40.
[0041] Specifically, refer to Figure 4 The diameter of the second part 522 is smaller than the inner diameter of the external thread of the first part 521, and the through hole of the slider 54 is also smaller than the inner diameter of the external thread of the first part 521. Due to size limitations, the slider 54 is confined to the area of the second part 522 to prevent it from moving into the first part 521 and causing structural jamming, while ensuring that the slider 54 remains in contact with the elastic element 60 to guarantee the stability of the overall structure. (Refer to...) Figure 1 and Figure 2 The drive component 51 has anti-slip texture 511 on its outer side to increase friction and reduce the possibility of slippage. The drive component 51 is also provided with a scale 512, which indicates the moving distance of the connector 53, improves the control accuracy of the movement of the connector 53, and prevents the connector 53 from moving beyond the range of the first part 521, thus ensuring the stability of the overall structure.
[0042] Reference Figure 4 In this embodiment, the adjustment process of the adjusting component 50 on the movable wheel 20 is as follows: the guide rod 52 is rotated by the driving component 51, and the connecting component 53 drives the eccentric component 40 to move synchronously along the first part 521 toward the fixed wheel 30. When the eccentric component 40 moves, it pushes the movable wheel 20 toward the fixed wheel 30, and the movable wheel 20 drives the slider 54 to move along the second part 522 and compress the elastic member 60. When the driving component 51 is rotated in the opposite direction, the connecting component 53 drives the eccentric component 40 to move along the first part 521 away from the fixed wheel 30. The elastic member 60 pushes the slider 54 away from the fixed wheel 30, so that the slider 54 drives the movable wheel 20 to move away from the fixed wheel 30.
[0043] Reference Figure 1 and Figure 4 The eccentric assembly 40 includes a rotating wheel 41 and a rotating shaft 42. The rotating wheel 41 is connected to the rotating shaft 42, the center of the rotating wheel 41 does not coincide with the center of the rotating shaft 42, and the rotating wheel 41 rotates about the rotating shaft 42. (See reference...) Figure 1The outer circumferential surface of the rotating wheel 41 abuts against the movable wheel 20, and the distance between the movable wheel 20 and the rotating shaft 42 changes as the rotating wheel 41 rotates. The point on the surface of the rotating wheel 41 farthest from the center of the rotating shaft 42 is the farthest point 411, and the point on the surface of the rotating wheel 41 closest to the center of the rotating shaft 42 is the closest point (not shown in the figure). During the process of the rotating wheel 41 rotating to the farthest point 411 and abutting against the movable wheel 20, the rotating wheel 41 pushes the movable wheel 20 to move away from the rotating shaft 42, that is, the movable wheel 20 moves towards the fixed wheel 30. During the process of the rotating wheel 41 rotating to the closest point (not shown in the figure) and abutting against the movable wheel 20, the elastic element 60 pushes the movable wheel 20 to move towards the rotating shaft 42, that is, the movable wheel 20 moves away from the fixed wheel 30. Therefore, the eccentric assembly 40 can further adjust the movement range of the movable wheel 20 based on the adjusting assembly 50.
[0044] In this embodiment, the rotating wheel 41 is fixedly connected to the rotating shaft 42, and the rotating shaft 42 is rotatably connected to the connecting member 53. (Refer to...) Figure 1 A handle 43 is provided at the end of the rotating shaft 42 away from the connector 53. The handle 43 is flat to facilitate gripping the rotating shaft 42 to control the rotation of the rotating wheel 41.
[0045] In another embodiment, the rotating wheel 41 is rotatably connected to the rotating shaft 42, and the rotating shaft 42 is fixedly connected to the connecting member 53. The rotating wheel 41 is provided with a handle 43 for controlling the rotation of the rotating wheel 41.
[0046] Optionally, in the above embodiments, the rotating wheel 41 can be a circular wheel, an elliptical wheel, or a polygonal wheel, or other structures capable of eccentric motion.
[0047] Reference Figure 1 and Figure 3 The wire guide in this embodiment also includes a first pad 22 and a second pad 31. The first pad 22 is movably connected to the main board 10, and a moving wheel 20 is rotatably connected to the first pad 22. The second pad 31 is fixedly connected to the end of the main board 10 away from the eccentric assembly 40, and a fixed wheel 30 is rotatably connected to the second pad 31. (Refer to...) Figure 1 and Figure 3 The first pad 22 has a contoured surface 21 on the side that abuts against the rotating wheel 41. The contoured surface 21 is fitted and engaged with the outer peripheral surface of the part where the farthest point 411 of the rotating wheel 41 is located, so as to limit the rotation position of the fixed rotating wheel 41 and keep the moving wheel 20 stable.
[0048] During the process of rotating wheel 41 engaging with the contour surface 21, the first pad 22 pushes the moving wheel 20 towards the fixed wheel 30. During the process of rotating wheel 41 rotating in the opposite direction until it disengages from the contour surface 21, the elastic element 60 pushes the moving wheel 20 away from the fixed wheel 30. In this embodiment, when it is necessary to repeatedly clamp the same type of wire, the moving wheel 20 can be repeatedly adjusted using the eccentric component 40. Before clamping the wire, rotate wheel 41 to engage with the contour surface 21, and then continue to use the adjustment component 50 to clamp the wire between the moving wheel 20 and the fixed wheel 30. When it is necessary to replace or re-clamp the same size wire, rotate wheel 41 to disengage from the contour surface 21, increasing the distance between the moving wheel 20 and the fixed wheel 30, facilitating wire insertion. Repeated adjustment of the moving wheel 20 using the eccentric component 40 ensures that the moving wheel 20 is fixed in the same position each time, simplifying operation and effectively reducing the time spent precisely adjusting the moving wheel 20 using the adjustment component 50, thus improving work efficiency.
[0049] Specifically, refer to Figure 3 The first pad 22 has a protrusion at one end near the rotating wheel 41, and the protrusion is located on one side of the rotating wheel 41. The contoured surface 21 is the transition surface between the side of the protrusion near the rotating wheel 41 and the first pad 22. As the farthest point 411 of the rotating wheel 41 rotates from the side away from the protrusion to abutting the contoured surface 21, the rotating wheel 41 gradually pushes the moving wheel 20 toward the fixed wheel 30. When the rotating wheel 41 engages with the contoured surface 21, the farthest point 411 is located on one side of the line connecting the center of the moving wheel 20 and the circle of the fixed wheel 30, so that the rotating wheel 41 can be stably engaged with the contoured surface 21, thereby ensuring the stability of the moving wheel 20.
[0050] Alternatively, the rotating wheel 41 can also be fixed in other ways, such as by setting matching buckle structures on the main board 10 and the rotating wheel 41, or by using a pin structure to fix the rotating wheel 41 relative to the main board 10, or by setting multiple limiting grooves 12 at different positions on the main board 10 to control the rotating wheel 41 to be limited and fixed at different positions, so as to achieve more precise position control of the moving wheel 20.
[0051] Furthermore, referring to Figure 3 A limiting member 23 is provided on the side of the first pad 22 near the main board 10, and a limiting groove 12 is provided on the main board 10, which is parallel to the guide groove 11. The limiting member 23 is movably connected to the limiting groove 12. The length of the limiting groove 12 is set according to the movement range of the first pad 22 and the moving wheel 20 to avoid collision between the moving wheel 20 and the fixed wheel 30, and to avoid the connection member 53 from disengaging from the external thread of the first part 521 due to excessive adjustment.
[0052] Reference Figure 3 and Figure 4 The movable wheel 20 has a first annular groove 24 on its side, and the fixed wheel 30 has a second annular groove 32 on its side. The first annular groove 24 and the second annular groove 32 have the same structure, and both are recessed inwards to conform to the shape of the wire. (Refer to...) Figure 1 and Figure 4 The center of the movable wheel 20 and the center of the fixed wheel 30 are aligned along the same straight line, and the movable wheel 20 moves along this straight line. The fixed wheel 30 and the movable wheel 20 are aligned in height by a second pad 31 and a first pad 22 to ensure symmetrical and stable pressure applied to the wire, reducing wear on the wire. Also, refer to... Figure 3 The movable wheel 20 and the fixed wheel 30 are respectively located at the edges of the first pad 22 and the second pad 31, so that the outer peripheral surfaces of the movable wheel 20 and the fixed wheel 30 can be close together to clamp the wire.
[0053] The wire guide in this embodiment achieves further adjustment of the moving wheel by connecting an eccentric component to the adjustment component, effectively increasing the range of movement of the moving wheel. The eccentric component can also control the moving wheel to move within a fixed distance, avoiding the complex steps of multiple adjustments through the adjustment component. This wire guide has a simple structure, is easy to operate, and effectively improves the accuracy of moving the moving wheel to the same position, thereby improving work efficiency.
[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A wire guide, characterized in that, The wire guide includes: Motherboard (10); Fixed wheel (30) and movable wheel (20) are disposed opposite to each other on the surface of the main board (10), and the movable wheel (20) is movable in a direction away from or close to the fixed wheel (30); An eccentric assembly (40) abuts against the side of the movable wheel (20) away from the fixed wheel (30), and the eccentric assembly (40) pushes the movable wheel (20) toward the side of the fixed wheel (30) by rotation; An adjustment component (50) is connected to the eccentric component (40), the adjustment component (50) being configured to drive the eccentric component (40) to move toward one side of the fixed wheel (30), the eccentric component (40) pushing the moving wheel (20) to move synchronously toward one side of the fixed wheel (30); An elastic element (60) is connected between the movable wheel (20) and the fixed wheel (30), and the elastic element (60) is configured to push the movable wheel (20) to move and reset toward a side away from the fixed wheel (30).
2. The wire guide according to claim 1, characterized in that, The motherboard (10) is provided with a guide groove (11), the opening of the guide groove (11) is disposed on the surface of the motherboard (10), and the adjustment component (50) includes: The drive unit (51) is rotatably disposed on the side of the main board (10) away from the fixed wheel (30); A guide rod (52) is disposed in the guide groove (11). One end of the guide rod (52) is rotatably connected to the groove wall of the guide groove (11), and the other end is connected to the drive member (51). The connector (53) is threaded to the outside of the guide rod (52), and the eccentric assembly (40) is rotatably connected above the connector (53); The driving member (51) is configured to drive the guide rod (52) to rotate. When the guide rod (52) rotates, the connecting member (53) moves along the guide rod (52) and drives the eccentric assembly (40) to move. At the same time, the eccentric assembly (40) pushes the moving wheel (20) to move.
3. The wire guide according to claim 2, characterized in that, The guide rod (52) includes a first part (521) and a second part (522) connected axially. The first part (521) is provided with external threads, and the connector (53) is threadedly connected to the first part (521). The adjustment assembly (50) further includes a slider (54), which is slidably connected to the second part (522), and the movable wheel (20) is connected to the slider (54).
4. The wire guide according to claim 3, characterized in that, The elastic element (60) is sleeved on the outside of the second part (522). One end of the elastic element (60) abuts against the groove wall of the guide groove (11), and the other end abuts against the slider (54).
5. The wire guide according to claim 2, characterized in that, The drive component (51) has anti-slip texture (511) and scale (512) on its outer side.
6. The wire guide according to claim 2, characterized in that, The eccentric assembly (40) includes a rotating wheel (41) and a rotating shaft (42). The center of the rotating wheel (41) does not coincide with the center of the rotating shaft (42). The rotating shaft (42) is connected to the connector (53). The outer circumferential surface of the rotating wheel (41) abuts against the moving wheel (20).
7. The wire guide according to claim 6, characterized in that, The wire guide also includes a first pad (22) and a second pad (31). The first pad (22) is movably connected to the main board (10). The second pad (31) is fixedly connected to the end of the main board (10) away from the eccentric component (40). The fixed wheel (30) is rotatably connected to the second pad (31). The movable wheel (20) is rotatably connected to the side of the first pad (22) near the fixed wheel (30). The rotating wheel (41) abuts against the first pad (22).
8. The wire guide according to claim 7, characterized in that, The first pad (22) has a contoured surface (21) on the side that abuts against the rotating wheel (41), and the contoured surface (21) is adapted to engage with the outer peripheral surface of the part where the farthest point (411) of the rotating wheel (41) is located.
9. The wire guide according to claim 8, characterized in that, The first pad (22) is provided with a limiting member (23) on the side close to the main board (10). The main board (10) is provided with a limiting groove (12) arranged parallel to the guide groove (11). The limiting member (23) is movably connected to the limiting groove (12).
10. The wire guide according to claim 8, characterized in that, The side of the movable wheel (20) is provided with a first annular groove (24), and the side of the fixed wheel (30) is provided with a second annular groove (32). The first annular groove (24) and the second annular groove (32) have the same structure.