Combined nut structure with high transformation ratio

Abstract

The invention relates to the technical field of fasteners, and discloses a high-transformation-ratio combined type nut structure which comprises a connecting bolt, a nut body and a nut body. The positioning nut is connected with the bolt rod; the gear sleeve sleeves the positioning nut, and first sawteeth are arranged on the side, away from the bolt head, of the gear sleeve; a second connecting hole is formed in the orientation sleeve, two convex columns matched with the grooves are arranged in the orientation sleeve, the orientation sleeve is arranged on the bolt rod in a sleeving mode, second sawteeth are arranged on the side, close to the bolt head, of the orientation sleeve, the first sawteeth are meshed with the second sawteeth, and a plurality of positioning holes are further formed in the other side of the orientation sleeve; the flower nut is in threaded connection with the bolt rod, a limiting block is arranged on one side of the flower nut, a positioning groove is formed in the limiting block, and a fastening block is arranged on the other side of the flower nut; the lock pin is mounted in the positioning hole; the positioning nut, the tooth sleeve, the directional sleeve and the flower nut are sequentially arranged on the bolt rod in a sleeving mode. The connection stability and the vibration resistance are improved, and the advantages of being convenient to operate, capable of achieving multi-position fixation and the like are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a high-ratio combined nut structure. Background Art

[0002] A bolt is a mechanical part, a cylindrical threaded fastener that is matched with a nut. A type of fastener consisting of a head and a screw (a cylinder with external threads), which must be matched with a nut to fasten two parts with through holes. This type of connection is called a bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

[0003] In the existing field of fasteners, bolts are widely used as connecting parts in various mechanical structures. Their main function is to cooperate with nuts to achieve a fastened connection. Although the traditional nut structure meets the connection requirements to a certain extent, in specific application occasions, such as environments with high variable forces or frequent disassembly, traditional nuts often have problems such as easy loosening and poor durability, especially the loosening problem under vibration is particularly serious. In addition, for some special applications, such as occasions where space is limited or precise adjustment of the tightening force is required, the structure and function of traditional nuts are also difficult to meet the requirements. Therefore, the development of a new type of high-ratio combined nut structure aims to solve the above problems and improve the performance and reliability of the nut, which has important practical application value and market prospects. Summary of the invention

[0004] The purpose of the present invention is to provide a high-ratio combined nut structure to solve the above-mentioned problems.

[0005] The present invention provides a high-ratio combined nut structure, comprising:

[0006] A connecting bolt comprises a bolt head and a bolt rod, wherein the bolt rod is provided with a thread and two grooves, and the grooves are arranged along the axial direction of the bolt rod;

[0007] A positioning nut, which has threads inside, the positioning nut is threadedly connected to the bolt rod, and the positioning nut is used to fix the connected member between the positioning nut and the bolt head;

[0008] A toothed sleeve, wherein a first connecting hole is provided inside the toothed sleeve, the shape of the first connecting hole matches the shape of the positioning nut, the toothed sleeve is sleeved on the positioning nut, and a first serration is provided on a side of the toothed sleeve away from the bolt head;

[0009] An oriented sleeve, wherein a second connecting hole is provided inside the oriented sleeve, wherein two protrusions are provided in the second connecting hole, wherein the protrusions match the grooves, wherein the shape of the second connecting hole matches the bolt rod, wherein the oriented sleeve is sleeved on the bolt rod, wherein a second sawtooth is provided on a side of the oriented sleeve close to the bolt head, wherein the first sawtooth is meshed with the second sawtooth, and wherein a plurality of positioning holes are provided on a side of the oriented sleeve away from the bolt head;

[0010] A flower nut is provided with a third connecting hole inside, a thread is provided in the third connecting hole, the flower nut is threadedly connected to the bolt rod, a limiting block is provided on a side of the flower nut close to the bolt head, a positioning groove is provided on the limiting block, the positioning groove includes a first positioning groove, a second positioning groove and a limiting groove, and a fastening block is provided on a side of the flower nut away from the bolt head;

[0011] A locking pin installed in the positioning hole;

[0012] The positioning nut, the tooth sleeve, the directional sleeve and the flower nut are sequentially sleeved on the bolt rod.

[0013] Preferably, the positioning nut is an external hexagonal nut.

[0014] Preferably, the meshing degree between the first saw teeth and the second saw teeth is 40%-99%.

[0015] Preferably, the cross-sectional diameter of the flower nut is smaller than the cross-sectional diameter of the directional sleeve.

[0016] Preferably, both the first positioning groove and the second positioning groove pass through the limiting block, the limiting groove is arranged on a side away from the fastening block, and the limiting groove is connected to the second positioning groove up and down.

[0017] Preferably, the lock pin comprises a lock pin body and a lock pin connector, the lock pin body is arranged in the limiting groove, and the lock pin connector is arranged in the second positioning groove.

[0018] Preferably, the sum of the width of the first positioning groove and the width of the portion of the second positioning groove that can accommodate the locking pin body is greater than the diameter of the locking pin body, and the width of the second positioning groove is smaller than the diameter of the locking pin body.

[0019] Preferably, the depth of the positioning hole is less than the length of the locking pin body, and the depth of the limiting groove is the difference between the length of the locking pin body and the depth of the positioning hole.

[0020] Preferably, the fastening block is in an outer hexagonal shape.

[0021] Preferably, the number of the positioning holes is 23, and the number of the positioning grooves is 11.

[0022] Compared with the prior art, the beneficial effect of the present invention is that, through the threaded connection between the positioning nut and the bolt rod, the connected part is firmly fixed between the positioning nut and the bolt head, thereby improving the connection stability of the overall structure. The first serration and the second serration between the tooth sleeve and the directional sleeve mesh with each other to form a mechanical lock, which increases the stability of the entire structure in a vibration environment and effectively reduces the risk of loosening. A limit block is provided on the side of the flower nut close to the bolt head, and the limit groove includes a first positioning groove, a second positioning groove and a limit groove, so that the flower nut can be easily installed and disassembled, thereby improving the operating efficiency. A plurality of positioning holes are provided on the directional sleeve, and different positioning holes can be selected as needed for locking pin installation to achieve multi-position fixation and increase the flexibility of use. The combined nut structure is compact in design, occupies a small space, and is suitable for installation requirements in various narrow spaces. Due to its unique structure and the combination of multiple functional components, the combined nut structure is suitable for a variety of different connection scenarios, such as mechanical equipment, construction engineering and other fields. The high-ratio combined nut structure of the present invention not only ensures that the nut will never rotate or loosen under any tightening force, thereby improving the stability and vibration resistance of the connection, but also has the advantages of convenient operation and multi-position fixation, and is suitable for a wide range of fields and applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of a high-ratio combined nut structure of the present invention;

[0025] Figure 2 is a top view of a gear sleeve according to an embodiment of the present invention;

[0026] Figure 3 is a bottom view of the directional sleeve in an embodiment of the present invention;

[0027] Figure 4 is a top view of the directional sleeve in an embodiment of the present invention;

[0028] Figure 5 This is one of the structural schematic diagrams of the flower nut in the embodiment of the present invention;

[0029] Figure 6 This is the second structural schematic diagram of the flower nut in the embodiment of the present invention;

[0030] Figure 7 is a top view of a flower nut according to an embodiment of the present invention;

[0031] Figure 8 2 is a schematic diagram of the structure of the locking pin in an embodiment of the present invention.

[0032] Among them, 1. connecting bolt; 11. bolt head; 12. bolt rod; 13. groove; 2. positioning nut; 3. tooth sleeve; 31. first connecting hole; 32. first serration; 4. directional sleeve; 41. second connecting hole; 42. boss; 43. second serration; 44. positioning hole; 5. flower nut; 51. third connecting hole; 52. limiting block; 53. positioning groove; 531. first positioning groove; 532. second positioning groove; 533. limiting groove; 54. fastening block; 6. locking pin; 61. locking pin body; 62. locking pin connector; 100. connected part. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] like Figure 1-Figure 8 As shown, the present invention provides a high-ratio combined nut structure, comprising:

[0038] The connecting bolt 1 comprises a bolt head 11 and a bolt rod 12. The bolt rod 12 is provided with a thread and two grooves 13. The grooves 13 are arranged along the axial direction of the bolt rod 12.

[0039] The positioning nut 2 has a thread inside, and the positioning nut 2 is threadedly connected to the bolt rod 12. The positioning nut 2 is used to fix the connected member 100 between the positioning nut 2 and the bolt head 11;

[0040] The tooth sleeve 3 has a first connection hole 31 formed therein, and the shape of the first connection hole 31 matches the shape of the positioning nut 2. The tooth sleeve 3 is sleeved on the positioning nut 2, and a first serration 32 is formed on a side of the tooth sleeve 3 away from the bolt head 11;

[0041] The directional sleeve 4 has a second connecting hole 41 disposed therein, and two bosses 42 are disposed in the second connecting hole 41, the bosses 42 match the groove 13, and the shape of the second connecting hole 41 matches the bolt rod 12. The directional sleeve 4 is sleeved on the bolt rod 12, and a second sawtooth 43 is disposed on the side of the directional sleeve 4 close to the bolt head 11, and the first sawtooth 32 is meshed with the second sawtooth 43, and a plurality of positioning holes 44 are disposed on the side of the directional sleeve 4 away from the bolt head 11;

[0042] The flower nut 5 has a third connecting hole 51 disposed therein, and the third connecting hole 51 has a thread disposed therein. The flower nut 5 is threadedly connected to the bolt rod 12. A limiting block 52 is disposed on the side of the flower nut 5 close to the bolt head 11. A positioning groove 53 is disposed on the limiting block 52. The positioning groove 53 includes a first positioning groove 531, a second positioning groove 532 and a limiting groove 533. A fastening block 54 is disposed on the side of the flower nut 5 away from the bolt head 11.

[0043] Lock pin 6, which is installed in the positioning hole 44;

[0044] The positioning nut 2 , the tooth sleeve 3 , the orientation sleeve 4 and the flower nut 5 are sequentially sleeved on the bolt rod 12 .

[0045] In some embodiments of the present application, the positioning nut 2 is an external hexagonal nut.

[0046] The positioning nut 2 is an external hexagonal nut having six faces, each of which can be operated with a wrench for tightening or loosening.

[0047] In some embodiments of the present application, the meshing degree between the first saw teeth 32 and the second saw teeth 43 is 40%-99%.

[0048] The meshing degree between the first sawtooth 32 and the second sawtooth 43 is 40%-99%, which is to ensure that there is sufficient contact area between the sawtooths, so as to effectively transmit and disperse the huge reaction force generated by the tightening of the positioning nut 2. In this way, the teeth on the gear sleeve 3 and the directional sleeve 4 can be prevented from being damaged due to excessive stress, ensuring the stability and durability of the entire mechanical structure. This range of meshing degree not only ensures sufficient strength, but also avoids excessive friction and wear, thereby extending the service life of the equipment and reducing maintenance costs.

[0049] In some embodiments of the present application, the cross-sectional diameter of the flower nut 5 is smaller than the cross-sectional diameter of the orientation sleeve 4 .

[0050] The cross-sectional diameter of the flower nut 5 is smaller than that of the directional sleeve 4. By tightening the flower nut 5, it is closely matched with the directional sleeve 4, thereby realizing accurate positioning and fixing of the connector. This design not only ensures the stability of the structure, but also facilitates installation and disassembly, thereby improving the overall efficiency and reliability. In addition, because the cross-sectional area of ​​the flower nut 5 is smaller than that of the directional sleeve 4, it can be ensured that even if the flower nut 5 rotates during installation and disassembly, it will not affect other parts.

[0051] In some embodiments of the present application, the first positioning groove 531 and the second positioning groove 532 both penetrate the limiting block 52, the limiting groove 533 is arranged on the side away from the fastening block 54, and the limiting groove 533 is vertically connected to the second positioning groove 532. The retaining wall surface of the limiting groove 533 is on the side where the positioning nut 2 is rotated and tightened.

[0052] In this embodiment, the first positioning groove 531 and the second positioning groove 532 both penetrate the limiting block 52, so that they can provide clear positioning points for the connector. The limiting groove 533 is arranged on the side away from the fastening block 54, ensuring that the limiting groove 533 will not interfere with the fastening block 54 during installation or removal. In addition, the limiting groove 533 is connected to the second positioning groove 532 up and down. Such a design not only enhances the stability of the structure, but also allows the connector to be accurately positioned in the vertical direction, thereby ensuring accurate assembly and functional realization of the entire device.

[0053] In some embodiments of the present application, the locking pin 6 includes a locking pin body 61 and a locking pin connector 62 . The locking pin body 61 is disposed in the limiting groove 533 , and the locking pin connector 62 is disposed in the second positioning groove 532 .

[0054] The lock pin 6 includes a lock pin body 61 and a lock pin connector 62. The lock pin body 61 is designed as a solid metal rod or rod-shaped structure. The lock pin body 61 is installed in the positioning hole 44 and the limiting groove 533 to fix the position of the lock pin body 61 to ensure that it will not move or fall off during use. The lock pin connector 62 is a component connected to the lock pin body 61. It can be a ring-shaped, hook-shaped, rod-shaped or other forms of structure. The lock pin connector 62 is arranged in the second positioning groove 532, and the second positioning groove 532 limits the movement range of the lock pin connector 62. The design of the entire lock pin 6 device is to provide a reliable and easy-to-operate locking mechanism for fixing or locking certain parts of the equipment to prevent them from accidentally moving or separating during transportation, operation or storage. By arranging the lock pin body 61 and the lock pin connector 62 in the second positioning groove 532 and the limiting groove 533 respectively, it can be ensured that the lock pin 6 device can maintain stability and functionality under various working conditions.

[0055] In some embodiments of the present application, the width of the first positioning groove 531 plus the portion of the second positioning groove 532 that can accommodate the locking pin body 61 is greater than the diameter of the locking pin body 61, and the width of the second positioning groove 532 is smaller than the diameter of the locking pin body 61.

[0056] The width of the first positioning groove 531 plus the portion of the second positioning groove 532 that can accommodate the lock pin body 61 is greater than the diameter of the lock pin body 61, so that the lock pin body 61 can be easily inserted therein without being hindered. This design allows the lock pin body 61 to move freely in the first positioning groove 531, thereby achieving flexible positioning and adjustment. On the contrary, the width of the second positioning groove 532 is smaller than the diameter of the lock pin body 61, ensuring that the lock pin body 61 cannot be directly moved out. This design can be used to fix the position of the lock pin body 61 to prevent it from accidentally moving during use, thereby improving the stability and safety of the overall structure.

[0057] In some embodiments of the present application, the depth of the positioning hole 44 is less than the length of the locking pin body 61 , and the depth of the limiting groove 533 is the difference between the length of the locking pin body 61 and the depth of the positioning hole 44 .

[0058] The depth of the positioning hole 44 is smaller than the length of the locking pin body 61, so that a portion of the locking pin body 61 can protrude from the surface of the positioning hole 44. At the same time, the depth of the limiting groove 533 is designed to be the difference between the length of the locking pin body 61 and the depth of the positioning hole 44, ensuring that the locking pin body 61 can be properly limited and fixed in a proper position after being inserted into the positioning hole 44 and passing through the limiting groove 533, preventing it from being over-inserted or slipping out, thereby achieving a stable and reliable locking effect.

[0059] In some embodiments of the present application, the fastening block 54 is in an outer hexagonal shape.

[0060] The fastening block 54 is designed to be in an outer hexagonal shape so that a spanner can be used for tightening. Since the size of the flower nut 5 is small, direct operation by hand may encounter difficulties during installation, so a spanner is needed to ensure the accuracy and convenience of tightening.

[0061] In some embodiments of the present application, the number of the positioning holes 44 is 23, and the number of the positioning slots 53 is 11.

[0062] After setting the number of positioning holes 44 and positioning grooves 53 to 23 and 11, these two numbers have no other common divisor except 1. When the flower nut 5 rotates relative to the orientation sleeve 4, the number of times their positioning grooves 53 and positioning holes 44 overlap in a 360-degree circumference is a total of 11×23=253 times. In other words, no matter how it rotates and moves, there is a high probability that the positioning hole 44 will overlap with the positioning groove 53, which is convenient for the installation of the locking pin 6.

[0063] To further illustrate the present invention, the specific method of installation and disassembly of this scheme is now described in detail:

[0064] The connected part 100 is sleeved on the connecting bolt 1. First, the positioning nut 2 is tightened on the bolt rod 12 through threads. In order to prevent loosening, the tooth sleeve 3 is sleeved on the positioning nut 2. Since the shape of the first connecting hole 31 in the tooth sleeve 3 matches the shape of the positioning nut 2, the tooth sleeve 3 can be directly installed on the positioning nut 2 and will not rotate easily; secondly, the directional sleeve 4 is sleeved on the threaded rod through the cooperation of the protrusion 42 and the groove 13. Since the tooth sleeve 3 is provided with a first serration 32 and the directional sleeve 4 is provided with a second serration 43, the first serration 32 is meshed with the second serration 43. When installing the directional sleeve 4, the tooth sleeve 3 is tightened in the tightening direction and kept in the tightened state, the directional sleeve 4 is loosened in the loosening direction and kept in the tightened state, and then the directional sleeve 4 is pushed toward the tooth sleeve 3 for meshing. Pay attention to observe whether the meshing degree between the first saw tooth 32 and the second saw tooth 43 is between 40% and 99%. If not, remove the orientation sleeve 4 and reinstall it until the meshing degree between the first saw tooth 32 and the second saw tooth 43 is between 40% and 99%; and keep pushing the orientation sleeve 4 toward the gear sleeve 3 without releasing it. When the bolt 12 is in the state of being pressed against the guide sleeve 4, the guide sleeve 4 is tightened to the guide sleeve 4, and the guide sleeve 4 is tightened to the guide sleeve 4, and the guide sleeve 4 is tightened to the guide sleeve 4, the guide sleeve 4 is tightened to the guide sleeve 3, and the guide sleeve 4 is tightened to the guide sleeve 3.

[0065] When disassembling, turn the flower nut 5 in the tightening direction. If it cannot be turned, turn it in the loosening direction (you can also turn the flower nut 5 in the tight direction to the appropriate position and then remove the locking pin 6). Use gentle force to avoid damaging the parts. Special reminder: just turn it in the loosening direction. Do not move the distance to prevent the locking pin 6 from being pressed in the reverse direction. Then remove the locking pin 6, rotate and remove the flower nut 5, directional sleeve 4, gear sleeve 3, positioning nut 2, and connecting bolt 1.

[0066] A smaller depression is provided inside the circle of the flower nut 5 toward the directional sleeve 4. This is to ensure that even when the locking pin 6 is at the maximum swing amplitude, the limit block 52 of the flower nut 5 can block the locking pin body 61, so that the locking pin 6 cannot fall off. In order to ensure the realization of this goal, the swing distance of the flower nut 5 is set to be longer. At the same time, it is also necessary to ensure that the flower nut 5 can still have sufficient residual tightening force after being pressed against the locking pin body 61 at this longer swing distance, and at the same time, it can prevent the locking pin 6 from swinging and making noise. Therefore, an inner depression of the flower nut 5 toward the directional sleeve 4 is provided to realize these functions.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A high-ratio combined nut structure, characterized in that: include: A connecting bolt comprises a bolt head and a bolt rod, wherein the bolt rod is provided with a thread and two grooves, and the grooves are arranged along the axial direction of the bolt rod; A positioning nut, which has threads inside, the positioning nut is threadedly connected to the bolt rod, and the positioning nut is used to fix the connected member between the positioning nut and the bolt head; A toothed sleeve, wherein a first connecting hole is provided inside the toothed sleeve, the shape of the first connecting hole matches the shape of the positioning nut, the toothed sleeve is sleeved on the positioning nut, and a first serration is provided on a side of the toothed sleeve away from the bolt head; An oriented sleeve, wherein a second connecting hole is provided inside the oriented sleeve, two protrusions are provided in the second connecting hole, the protrusions match the grooves, the shape of the second connecting hole matches the bolt rod, the oriented sleeve is sleeved on the bolt rod, a second sawtooth is provided on a side of the oriented sleeve close to the bolt head, the first sawtooth is meshed with the second sawtooth, and a plurality of positioning holes are provided on a side of the oriented sleeve away from the bolt head; A flower nut is provided with a third connecting hole inside, a thread is provided in the third connecting hole, the flower nut is threadedly connected to the bolt rod, a limiting block is provided on a side of the flower nut close to the bolt head, a positioning groove is provided on the limiting block, the positioning groove includes a first positioning groove, a second positioning groove and a limiting groove, and a fastening block is provided on a side of the flower nut away from the bolt head; A locking pin installed in the positioning hole; The positioning nut, the tooth sleeve, the directional sleeve and the flower nut are sequentially sleeved on the bolt rod.

2. The high-ratio combined nut structure according to claim 1, characterized in that: The positioning nut is an external hexagonal nut.

3. The high-ratio modular nut structure according to claim 1, characterized in that: The meshing degree between the first saw teeth and the second saw teeth is 40%-99%.

4. The high-ratio combined nut structure according to claim 1, characterized in that: The cross-sectional diameter of the flower nut is smaller than the cross-sectional diameter of the directional sleeve.

5. The high-ratio modular nut structure according to claim 1, characterized in that: The first positioning groove and the second positioning groove both penetrate the limiting block, the limiting groove is arranged on a side away from the fastening block, and the limiting groove is connected to the second positioning groove up and down.

6. The high-ratio modular nut structure according to claim 1, characterized in that: The lock pin includes a lock pin body and a lock pin connector. The lock pin body is arranged in the positioning hole and the limiting groove, and the lock pin connector is arranged in the second positioning groove.

7. The high-ratio modular nut structure according to claim 6, characterized in that: The sum of the width of the first positioning groove and the width of the portion of the second positioning groove that can accommodate the locking pin body is greater than the diameter of the locking pin body, and the width of the second positioning groove is smaller than the diameter of the locking pin body.

8. The high-ratio modular nut structure according to claim 7, characterized in that: The depth of the positioning hole is less than the length of the locking pin body, and the depth of the limiting groove is the difference between the length of the locking pin body and the depth of the positioning hole.

9. The high-ratio modular nut structure according to claim 1, characterized in that: The fastening block is in an outer hexagonal shape.

10. The high transformation ratio modular nut structure according to claim 1, characterized in that: The number of the positioning holes is 23, and the number of the positioning grooves is 11.

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