Striking tool

Abstract

The invention relates to a striking tool. The striking tool comprises a machine body and a power source used for providing power for the machine body. The machine body comprises a machine shell, a beating piece which is at least partially arranged on the machine shell and can move relative to the machine shell, a driving mechanism used for driving the beating piece to conduct beating, and a pull-back mechanism used for pulling back the beating piece. The striking piece comprises a piston, a striker connected with the piston, a rack component connected with the striker and a locking mechanism, the locking mechanism is at least matched with two of the piston, the striker and the rack component in a locking mode, and then stable matching of the piston, the striker and the rack component is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of tools, and in particular to a striking tool. Background Art

[0002] In the existing tool industry, striking tools have been widely used in life, such as air nail guns, electric steel nail guns, pneumatic nail removers, etc. However, how to achieve the miniaturization of striking tools has become a difficult problem in the industry. In a feasible solution, the striking part is disassembled to form a piston, a striker connected to the piston, and a rack member connected to the striker, and the rack member and the striker at least partially overlap in the longitudinal direction, so that the striking tool can be miniaturized. At the same time, how to ensure the stable cooperation of the piston, the striker and the rack member has become a prominent industry problem.

[0003] Therefore, it is necessary to provide a striking tool to achieve stable cooperation between the piston, the striker and the rack member. Summary of the invention

[0004] In order to solve the above technical problems, this application is implemented as follows: In one embodiment, a striking tool is provided, which includes a body and a power source for providing power to the body; the body includes a casing, a striking piece at least partially disposed on the casing and movable relative to the casing, a driving mechanism for driving the striking piece to strike, and a pulling back mechanism for pulling back the striking piece; the striking piece includes a piston, a striker connected to the piston, a rack member connected to the striker, and a locking mechanism, and the locking mechanism is locked with at least two of the piston, the striker, and the rack member.

[0005] In a preferred embodiment, among the piston, striker and rack components, a first threaded portion is provided between two of them, a second threaded portion is provided between another two of them, and the locking mechanism is provided between the remaining two; the pitch of the first threaded portion is different from the pitch of the second threaded portion; the striker is provided with a striking portion, the first threaded portion is connected to the striking portion, and the second threaded portion is connected to the first threaded portion; the piston has a main body, a docking portion extending forward from the main body, and a first threaded hole formed by a depression from the docking portion; the rack component has a barrel portion, a connecting column connected to the bottom of the barrel portion, and a lifting portion connected to the connecting column, and the rack component also has a second threaded hole formed by a depression from the connecting column; the first threaded portion is cooperatively connected with the second threaded hole; the second threaded portion is cooperatively connected with the first threaded hole.

[0006] In a preferred embodiment, the locking mechanism includes a ratchet structure, a pawl structure and an elastic member abutting against the pawl structure, which are arranged on the inner wall of the barrel portion; the pawl structure and the elastic member are arranged on the docking portion of the piston, the pawl structure has an abutting groove, and the elastic member is accommodated in the abutting groove.

[0007] In a preferred embodiment, the pawl structure further has a limiting portion located at the periphery; the docking portion is provided with an installation space formed by a depression from the docking surface, and the installation space has a limiting space; the limiting portion is limited within the limiting space.

[0008] In a preferred embodiment, the firing pin is also provided with a stop portion connected to the first threaded portion, and the docking portion is provided with a step portion; the free end of the connecting column abuts the stop portion, and the inner bottom surface of the barrel portion abuts the step portion; the height of the step portion is greater than the height of the inside of the side wall of the barrel portion, and when the installation is completed, the main body of the piston and the barrel portion of the rack member have a gap in the axial direction.

[0009] In a preferred embodiment, the locking mechanism includes a first locking portion arranged on the side wall of the barrel portion, a second locking portion arranged on the outer periphery of the docking portion, and a locking pin; the first locking portion and the second locking portion can be selectively opposite to each other, and the locking pin can be correspondingly inserted into the first locking portion and the second locking portion.

[0010] In a preferred embodiment, the locking mechanism also includes a locking groove and a clamp arranged on the side wall of the barrel portion or the side wall of the docking portion; the locking groove is arranged relative to the first locking portion and / or the second locking portion, and the clamp is installed in the locking groove and limits the radial outward movement of the locking pin.

[0011] In a preferred embodiment, the number of the first locking parts or the second locking parts is N, N is greater than or equal to 3 and is an integer, and the number of the second locking parts or the first locking parts is M, M is greater than or equal to 3 and is an integer; When M is not equal to N, and the first locking portion and the second locking portion are evenly arranged, the number of locking positions of the striking tool is greater than or equal to M and N and less than or equal to M*N; When the first locking portion and / or the second locking portion are arranged unevenly, the number of locking positions of the striking tool is greater than M and N and less than or equal to M*N.

[0012] In a preferred embodiment, the first locking parts or the second locking parts are provided in N numbers, N is greater than or equal to 3 and is an integer, the second locking parts or the first locking parts are provided in M ​​numbers, M is greater than N and is an integer; the N first locking parts or the second locking parts are evenly arranged, the M second locking parts or the first locking parts are evenly arranged, Q is the greatest common divisor of N and M, and the striking tool has N*M / Q locking positions, and the adjustment angle is 360 / (N*M / Q) degrees.

[0013] In a preferred embodiment, the first locking parts or the second locking parts are provided in N numbers, N is greater than or equal to 3 and is an integer, and the second locking parts or the first locking parts are provided in M ​​numbers, M is greater than or equal to 3 and is an integer; if the first locking parts or the second locking parts are uniformly provided, then the corresponding position X(i)=360 / N*i, i is (0, N]; if the second locking parts or the first locking parts are non-uniformly provided, then the corresponding position Y(j)=360 / N*n+360 / (I*J)*j, n is (0, N], j is (0, M].

[0014] Compared with the prior art, the striking tool of the present application has a locking mechanism, which is locked and matched with at least two of the piston, the striker and the rack component, thereby achieving stable matching of the piston, the striker and the rack component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional schematic diagram of a striking tool in one embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a striking member of a striking tool in one embodiment of the present application; Figure 3 This is a disassembled schematic diagram of a striking member of a striking tool in one embodiment of the present application; Figure 4 A schematic diagram of a striking member of a striking tool in an embodiment of the present application disassembled from another perspective; Figure 5 A cross-sectional view of a striking member of a striking tool in one embodiment of the present application; Figure 6 A cross-sectional view from another perspective of a striking member of a striking tool in one embodiment of the present application; Figure 7 This is a schematic diagram of the structure of a striking member of a striking tool in another embodiment of the present application; Figure 8 This is a disassembled schematic diagram of a striking member of a striking tool in another embodiment of the present application; Fig. 9 A schematic diagram of a striking member of a striking tool in another embodiment of the present application disassembled from another perspective; Fig.10 A cross-sectional view of a striking member of a striking tool in another embodiment of the present application; Fig.11 A cross-sectional view from another perspective of a striking member of a striking tool in another embodiment of the present application; Fig.12 This is a schematic diagram of the structure of the striking member of the striking tool in the third embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0017] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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 referred device or element 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.

[0018] In addition, 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0022] See also Figure 1 , an embodiment of the present application provides a striking tool 100, which may be a nail gun or a nail remover. The striking tool 100 may include a body and a power source for providing power to the body. The striking tool 100 may be a pneumatic striking tool or an electric striking tool. When the striking tool 100 is a pneumatic striking tool, the power source is an air pump; when the striking tool 100 is an electric striking tool, the power source may be a power supply mechanism. In the present embodiment, the striking tool 100 is an electric striking tool, and accordingly, the power supply mechanism may be a power cord or a battery pack. When the power source is a battery pack, in order to ensure that the striking tool 100 is not limited by distance during use, the battery pack is detachably connected to the body to facilitate charging of the battery pack. When the power source is directly a power cord, the use of the striking tool 100 is not limited by the amount of electricity.

[0023] See also Figure 1 The machine body includes a housing 10, a striking member 20 at least partially disposed on the housing 10 and movable relative to the housing 10, a driving mechanism 30 for driving the striking member 20 to strike, and a retracting mechanism 40 for retracting the striking member 20. When the striking tool 100 is a nail gun, the striking member 20 drives the nails in the nail magazine into the target object under the drive of the driving mechanism 30; when the striking tool 100 is a nail removal gun, the striking member 20 drives the nails in the target object out of the target object under the drive of the driving mechanism 30. The driving mechanism 30 may be a cylinder, a spring, etc. The retracting mechanism 40 may be a motor with a driving gear.

[0024] First embodiment For details, please refer to Figures 2 to 6 The striking member 20 may include a piston 21, a striker 22 connected to the piston 21, a rack member 23 connected to the striker 22, and a locking mechanism.

[0025] The piston 21 comprises a main body 211, a docking portion 212 extending forward from the main body 211, and a first threaded hole 213 formed by being recessed from the docking portion 212. The main body 211 is provided with a plurality of grooves on its periphery for placing O-rings to achieve a good sealing effect. The docking portion 212 is provided with a step portion 2121.

[0026] The striker 22 is provided with a striking portion 221, a first threaded portion 222 connected to the striking portion 221, and a second threaded portion 223 connected to the first threaded portion 222. The striking portion 221 can strike a nail to drive or withdraw the nail. The pitch of the first threaded portion 222 is different from the pitch of the second threaded portion 223. The striker 22 is also provided with a stopper 224 connected to the first threaded portion 222.

[0027] The rack member 23 comprises a cylindrical portion 231, a connecting post 232 connected to the bottom of the cylindrical portion 231, and a lifting portion 233 connected to the connecting post 232. The rack member 23 further comprises a second threaded hole 2321 formed by being recessed from the connecting post 232.

[0028] During assembly, the rack member 23 is first rotationally connected with the striker 22 from back to front, the first threaded portion 222 is matched with the second threaded hole 2321, and the free end of the connecting column 232 abuts the stop portion 224; then, the assembled rack member 23 and striker 22 combination is rotationally connected with the piston 21 from front to back, the second threaded portion 223 is matched with the first threaded hole 213, and the inner bottom surface of the barrel portion 231 abuts the step portion 2121.

[0029] For details, please refer to Figures 3 to 6In this embodiment, the locking mechanism includes a ratchet structure 234, a pawl structure 241 and an elastic member 242 abutting against the pawl structure 241, which are arranged on the inner wall of the barrel portion 231. The pawl structure 241 and the elastic member 242 are arranged on the docking portion 212 of the piston 21. The ratchet structure 234 and the pawl structure 241 can achieve one-way locking. The pawl structure 241 has an abutment groove for accommodating the elastic member 242 to achieve preliminary limiting of the elastic member 242. The pawl structure 241 also has a limiting portion 2411 located on the periphery. The docking portion 212 is provided with an installation space formed by a depression from the docking surface, and the installation space has a limiting space. The limiting portion 2411 is limited in the limiting space, and the pawl structure 241 can move radially and be limited on the docking portion 212, so as to achieve the convenience of assembly and maintenance. The height of the step portion 2121 is greater than the height of the inner side wall of the barrel portion 231. When the installation is completed, there is an axial gap between the main body 211 of the piston 21 and the barrel portion 231 of the rack member 23. When it is necessary to disassemble the striking member 20, a foreign object is used to pass through the gap to abut against the pawl structure 241, and at the same time rotate in the opposite direction, so that the rack member 23 and the firing pin 22 combination and the piston 21 can be disassembled.

[0030] Since the pitch of the first threaded portion 222 is different from the pitch of the second threaded portion 223 and the pawl structure 241 and the pawl structure 241 realize one-way locking, after assembly, the piston 21, the striker 22 and the rack member 23 can cooperate with each other stably without loosening. Second embodiment For details, please refer to Figures 7 to 11 The striking member 20 may include a piston 21A, a striker 22A connected to the piston 21A, a rack member 23A connected to the striker 22A, and a locking mechanism.

[0031] The piston 21A comprises a main body 211A, a docking portion 212A extending forward from the main body 211A, and a first threaded hole 213A formed by being recessed from the docking portion 212A. The main body 211A is provided with a plurality of grooves on its periphery for placing O-rings to achieve a good sealing effect. The docking portion 212A is provided with a step portion 2121A.

[0032] The striker 22A is provided with a striking portion 221A, a first threaded portion 222A connected to the striking portion 221A, and a second threaded portion 223A connected to the first threaded portion 222A. The striking portion 221A can strike a nail to drive or withdraw the nail. The pitch of the first threaded portion 222A is different from the pitch of the second threaded portion 223A. The striker 22A is also provided with a stopper 224A connected to the first threaded portion 222A.

[0033] The rack member 23A comprises a cylindrical portion 231A, a connecting post 232A connected to the bottom of the cylindrical portion 231A, and a lifting portion 233A connected to the connecting post 232A. The rack member 23A further comprises a second threaded hole 2321A recessed from the connecting post 232A.

[0034] During assembly, the rack component 23A is first rotationally connected with the striker 22A from back to front, the first threaded portion 222A is matched with the second threaded hole 2321A, and the free end of the connecting column 232A abuts the stop portion 224A; then, the assembled rack component 23A and striker 22A combination is rotationally connected with the piston 21A from front to back, the second threaded portion 223A is matched with the first threaded hole 213A, and the inner bottom surface of the barrel portion 231A abuts the step portion 2121A.

[0035] For details, please refer to Figures 8 to 11 In this embodiment, the locking mechanism includes a first locking portion 2311A (which may be a hole or a groove) arranged on the side wall of the barrel portion 231A, a locking groove 2312A arranged on the side wall of the barrel portion 231A, a second locking portion 2122A (which may be a hole or a groove) arranged on the outer periphery of the docking portion 212A, a locking pin 24A and a clamp 25A. The first locking portion 2311A and the second locking portion 2122A can be selectively opposite to each other (i.e., locked position), and the locking pin 24A can be correspondingly inserted into the first locking portion 2311A and the second locking portion 2122A to achieve the limiting of the rack member 23A and the striker 22A combination and the piston 21A. In order to fix the locking pin 24A, the locking groove 2312A is arranged relative to the first locking portion 2311A and / or the second locking portion 2122A. For details, refer to Fig.12 In other embodiments, the locking groove may also be provided on the side wall of the docking portion. When the clamp 25A is installed in the locking groove 2312A, the clamp 25A restricts the locking pin 24A from moving radially outward.

[0036] Since the pitch of the first threaded portion 222 is different from the pitch of the second threaded portion 223, and the locking pin 24A can be correspondingly inserted in the first locking portion 2311A and the second locking portion 2122A, further, when the clamp 25A is installed in the locking groove 2312A, the clamp 25A limits the locking pin 24A from moving radially outward; therefore, after the assembly is completed, the piston 21A, the striker 22A and the rack member 23A can cooperate with each other stably without loosening.

[0037] In one embodiment, in order to more accurately achieve the locking of the piston 21A, the striker 22A and the rack member 23A, the first locking portion 2311A or the second locking portion 2122A is provided in N numbers (N is greater than or equal to 3 and is an integer), and the second locking portion 2122A or the first locking portion 2311A is provided in M ​​numbers (M is greater than N and is an integer); the N first locking portions 2311A or the second locking portions 2122A are evenly arranged, and the M second locking portions 2122A or the first locking portions 2311A are evenly arranged (evenly arranged relative to the overall periphery), Q is the greatest common divisor of N and M, and the striking tool has N*M / Q locking positions, that is, the adjustment angle is 360 / (N*M / Q) degrees. In one specific embodiment, six first locking parts 2311A are provided, and the angle between two adjacent first locking parts 2311A is 60 degrees; five second locking parts 2122A are provided, and the angle between two adjacent second locking parts 2122A is 72 degrees; therefore, the first locking part 2311A and the second locking part 2122A have a total of 30 evenly distributed locking positions, with one locking position every 12 degrees (adjustment angle). In another specific embodiment, six first locking parts 2311A are provided, and the angle between two adjacent first locking parts 2311A is 60 degrees; eight second locking parts 2122A are provided, and the angle between two adjacent second locking parts 2122A is 45 degrees; therefore, the first locking part 2311A and the second locking part 2122A have a total of 24 evenly distributed locking positions, with one locking position every 15 degrees (adjustment angle).

[0038] In another embodiment, in order to more accurately achieve the locking of the piston 21A, the striker 22A and the rack member 23A. The first locking portion 2311A or the second locking portion 2122A is provided with N (N is greater than or equal to 3 and is an integer), and the second locking portion 2122A or the first locking portion 2311A is provided with M (M is greater than or equal to 3 and is an integer); if the first locking portion 2311A or the second locking portion 2122A is uniformly provided, the corresponding position X (i) = 360 / N*i, i is (0, N]; if the second locking portion 2122A or the first locking portion 2311A is non-uniformly provided, the corresponding position Y (j) = 360 / N*n+360 / (I*J)*j, n takes a value of (0, N] (can take any integer value within the range), j takes a value of (0, M]. For example, six first locking parts 2311A are provided, and the angle between two adjacent first locking parts 2311A is 60 degrees, and six second locking parts 2122A are provided and satisfy the position Y(j) formula; therefore, the first locking part 2311A and the second locking part 2122A have a total of 36 evenly distributed locking positions, with one locking position every 10 degrees, so the locking positions of the piston 21A, the striker 22A and the rack member 23A can be more precise.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A striking tool, characterized in that: It comprises a body and a power source for providing power to the body; the body comprises a casing, a striking piece at least partially disposed on the casing and movable relative to the casing, a driving mechanism for driving the striking piece to strike, and a pulling mechanism for pulling back the striking piece; The striking member includes a piston, a striker connected to the piston, a rack component connected to the striker, and a locking mechanism, and the locking mechanism is locked and cooperated with at least two of the piston, the striker and the rack component.

2. The striking tool according to claim 1, characterized in that: Among the piston, striker and rack components, a first threaded portion is provided between two of them, a second threaded portion is provided between another two of them, and the locking mechanism is provided between the remaining two; the pitch of the first threaded portion is different from the pitch of the second threaded portion; the striker is provided with an impact portion, the first threaded portion is connected to the impact portion, and the second threaded portion is connected to the first threaded portion; the piston has a main body, a docking portion extending forward from the main body, and a first threaded hole formed by a depression from the docking portion; the rack component has a barrel portion, a connecting column connected to the bottom of the barrel portion, and a lifting portion connected to the connecting column, and the rack component also has a second threaded hole formed by a depression from the connecting column; the first threaded portion is matched and connected with the second threaded hole; the second threaded portion is matched and connected with the first threaded hole.

3. The striking tool according to claim 2, characterized in that: The locking mechanism includes a ratchet structure, a pawl structure and an elastic member abutting against the pawl structure, which are arranged on the inner wall of the barrel portion; the pawl structure and the elastic member are arranged on the docking portion of the piston, the pawl structure has an abutting groove, and the elastic member is accommodated in the abutting groove.

4. The striking tool according to claim 3, characterized in that: The pawl structure also has a limiting portion located at the periphery; the docking portion is provided with an installation space formed by a depression from the docking surface, and the installation space has a limiting space; the limiting portion is limited in the limiting space.

5. The striking tool according to claim 3 or 4, characterized in that: The firing pin is also provided with a stop portion connected to the first threaded portion, and the docking portion is provided with a step portion; the free end of the connecting column abuts against the stop portion, and the inner bottom surface of the barrel portion abuts against the step portion; the height of the step portion is greater than the height of the inside of the side wall of the barrel portion, and when the installation is completed, the main body of the piston and the barrel portion of the rack component have a gap in the axial direction.

6. The striking tool according to claim 2, characterized in that: The locking mechanism includes a first locking portion arranged on the side wall of the barrel portion, a second locking portion arranged on the outer periphery of the docking portion, and a locking pin; the first locking portion and the second locking portion can be selectively opposite to each other, and the locking pin can be correspondingly inserted into the first locking portion and the second locking portion.

7. The striking tool according to claim 6, characterized in that: The locking mechanism also includes a locking groove and a clamp arranged on the side wall of the barrel part or the side wall of the docking part; the locking groove is arranged relative to the first locking part and / or the second locking part, and the clamp is installed in the locking groove and limits the radial outward movement of the locking pin.

8. The striking tool according to claim 7, characterized in that: The number of the first locking parts or the second locking parts is N, N is greater than or equal to 3 and is an integer, and the number of the second locking parts or the first locking parts is M, M is greater than or equal to 3 and is an integer; When M is not equal to N, and the first locking portion and the second locking portion are evenly arranged, the number of locking positions of the striking tool is greater than or equal to M and N and less than or equal to M*N; When the first locking portion and / or the second locking portion are arranged unevenly, the number of locking positions of the striking tool is greater than M and N and less than or equal to M*N.

9. The striking tool according to claim 8, characterized in that The first locking part or the second locking part is provided in N number, N is greater than or equal to 3 and is an integer, the second locking part or the first locking part is provided in M ​​number, M is greater than N and is an integer; the N first locking parts or the second locking parts are evenly arranged, the M second locking parts or the first locking parts are evenly arranged, Q is the greatest common divisor of N and M, the striking tool has N*M / Q locking positions, and the adjustment angle is 360 / (N*M / Q) degrees.

10. The striking tool according to claim 8, wherein: The first locking part or the second locking part is provided with N, N is greater than or equal to 3 and is an integer, and the second locking part or the first locking part is provided with M, M is greater than or equal to 3 and is an integer; if the first locking part or the second locking part is uniformly provided, the corresponding position X(i)=360 / N*i, i is (0, N]; if the second locking part or the first locking part is non-uniformly provided, the corresponding position Y(j)=360 / N*n+360 / (I*J)*j, n is (0, N], j is (0, M].

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