Connecting piece and connecting assembly

Abstract

The utility model provides a connecting piece and a connecting assembly, and belongs to the technical field of robot splicing, the connecting piece comprises a cylindrical first connecting body, a protruding part is formed on the side wall of the first connecting body, and a tooth structure used for being matched with a tooth ring structure of a second connecting piece is formed at the top of the protruding part; when the connecting piece and the second connecting piece rotate relatively, the tooth structure is matched with the tooth groove of the tooth ring structure so that damping between the connecting piece and the second connecting piece can be increased. A clamping structure used for being matched with the third connecting piece in a clamping mode is further formed on the side wall of the protruding part. The problems of poor module rotation attitude stability, high cost and high splicing difficulty in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of robot assembly, and in particular to a connector and a connector assembly. Background Art

[0002] A robot is an intelligent machine that can work semi-autonomously or fully autonomously. It has basic features such as perception, decision-making, and execution, and can assist or even replace humans in completing dangerous, heavy, and complex tasks. Robots in related technologies are generally composed of multiple modules, with a rotating shaft set between two adjacent modules, and then a driving mechanism connected to the control center is added between adjacent modules. The control center can achieve the corresponding movement of the robot by controlling the driving mechanisms between each module.

[0003] When multiple modules are connected, sometimes the modules need to be rotationally connected, and sometimes the modules need to be locked and unable to rotate relative to each other. In the prior art, when the modules need to be rotationally connected, a bearing is usually installed between the two modules to achieve a rotating connection structure; when the modules need to be locked, a locking structure that cannot rotate is usually achieved by clamping the two modules.

[0004] With regard to the above technical solution, the inventor believes that the use of bearings to achieve rotation between modules has the disadvantage that the modules are prone to rotate again after the rotation posture is adjusted, making it difficult for the robot to maintain a good posture, and has the defect of poor stability; and during assembly, it is necessary to set up a snap-on mechanism that can form a snap-on connection with other modules. Therefore, there is not only a problem of high cost but also a defect of great difficulty. Utility Model Content

[0005] The purpose of the present application is to provide a connector and a connector assembly, aiming to solve the problems of poor module rotation posture stability, high manufacturing cost and high splicing difficulty in the related art.

[0006] Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

[0007] According to the first aspect of the present application, a connecting member is provided, comprising a first connecting body in a cylindrical shape, a protrusion being formed on the side wall of the first connecting body, a tooth structure being formed on the top of the protrusion for cooperating with a toothed ring structure of a second connecting member, and when the connecting member and the second connecting member rotate relative to each other, the tooth structure and the tooth groove of the toothed ring structure cooperate to increase the damping between the connecting member and the second connecting member; the side wall of the protrusion is also formed with a snap-fitting structure for forming a snap-fitting fit with a third connecting member.

[0008] In an exemplary embodiment of the present application, the first connector includes a first cylindrical connector and a second cylindrical connector along its axial direction, the outer diameter of the first cylindrical connector is smaller than the outer diameter of the second cylindrical connector so that a step is formed between the first cylindrical connector and the second cylindrical connector, the protrusion is formed on the step, and a reinforcing portion for reinforcing the structure is formed on the side wall of the second cylindrical connector.

[0009] In an exemplary embodiment of the present application, the protrusion and the reinforcement portion correspond to each other along the axial direction and are formed into an integral structure.

[0010] In an exemplary embodiment of the present application, the first cylindrical connector is a magnetic component, and the first cylindrical connector is magnetically connected to the third cylindrical connector in the second connector. The end face of the first cylindrical connector is provided with a protrusion or a groove, which can form a plug-in fit with the groove or protrusion on the end face of the third cylindrical connector; during the rotation of the connector and the second connector, the protrusion can slide relatively in the groove along the direction of the rotation axis, and the protrusion is always located in the groove.

[0011] In an exemplary embodiment of the present application, the protrusion and / or the reinforcement portion is provided in plurality and is circumferentially spaced apart along a step formed between the first cylindrical connector and the second cylindrical connector.

[0012] In an exemplary embodiment of the present application, a first mounting groove for mounting the first cylindrical connector is formed on an end surface of one side of the second cylindrical connector, a first through groove is formed on the bottom wall of the first mounting groove and extends to the end surface of the other side of the second cylindrical connector, a first plug-in piece is fixed to the end surface of one side of the first cylindrical connector, and the first plug-in piece passes through the first through groove and is folded to the side of the second cylindrical connector facing away from the first mounting groove.

[0013] In an exemplary embodiment of the present application, it also includes a cylindrical second connector and a third connector for horizontally connecting the first connector and the second connector, and the second connector has the same gear ring structure as the second connector and a magnetic body capable of magnetic connection.

[0014] According to a second aspect of the present application, a connection assembly is provided, comprising: a connection member; a second connection member having a toothed ring structure for cooperating with a toothed structure of a protruding portion; and a third connection member (5) configured to form a snap fit with the snap fit structure of the protruding portion.

[0015] In an exemplary embodiment of the present application, the second connecting member includes a third cylindrical connector and a fourth cylindrical connector, the third cylindrical connector is a magnetic member, the outer diameter of the third cylindrical connector is smaller than the outer diameter of the fourth cylindrical connector so that a step is formed between the third cylindrical connector and the fourth cylindrical connector, and the first cylindrical connector can be interlocked with the third cylindrical connector and magnetically connected; a second mounting groove for mounting the third cylindrical connector is provided on an end face of one side of the fourth cylindrical connector, a second through groove is provided on the bottom wall of the first mounting groove of the fourth cylindrical connector, which penetrates to the end face of the other side of the second cylindrical connector, and a second plug-in piece is fixed on the end face of one side of the third cylindrical connector, and the second plug-in piece passes through the second through groove and is folded to the side of the second cylindrical connector facing away from the second mounting groove.

[0016] In an exemplary embodiment of the present application, an assembly groove is provided inside the third connecting member, and the assembly groove has an inner corner structure, the connecting member can be inserted into the assembly groove, and the snap-fit ​​structure of the protrusion can snap-fit ​​with the inner corner of the assembly groove.

[0017] The exemplary embodiments of the present application may have some or all of the following beneficial effects:

[0018] 1. In a connector provided in an exemplary embodiment of the present application, the tooth structure of the protruding portion can increase the damping between the connector and the second connector, thereby improving the stability of the connector and the second connector after the posture is rotated and adjusted; and the clamping structure of the protruding portion can achieve a clamping effect that the connector and the third connector cannot rotate with each other; and through the above structure, the stability of the module after the rotation posture is adjusted can be improved only by the protruding portion, and the clamping between the modules can be achieved without designing other structures, which not only reduces the manufacturing cost but also reduces the difficulty of splicing between the modules;

[0019] 2. In a connection assembly provided in an exemplary embodiment of the present application, when the connection member and the second connection member are rotationally connected, the damping between the connection member and the second connection member is increased by meshing between the tooth structure and the gear ring structure, thereby achieving good stability of the connection member and the second connection member after rotation adjustment;

[0020] 3. In a connection assembly provided in an exemplary embodiment of the present application, the first cylindrical connection body and the third cylindrical connection body in the second connection member are magnetically connected, so that the connection member and the second connection member can both rotate and move along the axial direction, and when the protrusion rotates to abut against the tooth top structure in the gear ring structure, the connection member moves away from the second connection member, and when the protrusion rotates to the tooth groove in the gear ring structure, the connection member moves closer to the second connection member; so that the connection member and the second connection member can increase damping while being able to rotate normally;

[0021] 4. A connection assembly provided in the exemplary embodiment of the present application, through the boss and the groove, plays a positioning role for the connection member and the second connection member when they are magnetically connected, ensuring that the connection member can still have good magnetism when it is away from the second connection member, thereby improving the connection member and the second connection member can have good stability when they rotate;

[0022] 5. The clamping structure of the protruding part is clamped with the inner corner of the assembly groove, so that the connecting member and the third connecting member cannot rotate relative to each other, so as to achieve a locked state, which has the characteristics of simple and convenient operation.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a connecting member in an embodiment of the present application is shown;

[0026] Figure 2 An exploded view of the structure of the first cylindrical connector and the second cylindrical connector in an embodiment of the present application is shown;

[0027] Figure 3 A partial schematic diagram of the specific structure of the second cylindrical connector in the embodiment of the present application is shown;

[0028] Figure 4 An exploded view of the connection structure of the connecting member and the second connecting member in an embodiment of the present application is shown;

[0029] Figure 5 An exploded view of the structure of the third cylindrical connector and the fourth cylindrical connector in the embodiment of the present application is shown;

[0030] Figure 6 An exploded view showing the connection between the connecting member and the third connecting member in the embodiment of the present application is shown;

[0031] Figure 7 An exploded view of the first connector and the protruding structure in the embodiment of the present application is shown.

[0032] Description of reference numerals:

[0033] 1. First connector; 11. Raised portion; 111. Tooth structure; 112. Clamping structure; 12. Reinforcement portion; 13. First cylindrical connector; 131. First plug-in piece; 14. Second cylindrical connector; 141. First mounting groove; 142. First through groove; 2. Second connector; 3. Third connector; 4. Second connector; 41. Third cylindrical connector; 411. Second plug-in piece; 42. Fourth cylindrical connector; 421. Second mounting groove; 422. Second through groove; 5. Third connector; 51. Assembly groove; 6. Tooth ring structure; 7. Bump; 8. Groove; 9. Magnetic body. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed descriptions will be omitted. In addition, the drawings are only schematic illustrations of the present application and are not necessarily drawn to scale.

[0035] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the diagram to another component, these terms are used in this specification only for convenience, such as according to the direction of the examples in the drawings. It is understood that if the device of the diagram is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0036] The terms "a", "an", "the" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first" and "second" are used merely as labels and are not intended to limit the quantity of their objects.

[0037] Example 1

[0038] Reference Figure 1 , Figure 4 and Figure 6As shown, a connecting member in an embodiment of the present application includes a first connecting body 1 in a cylindrical shape, a protrusion 11 is formed on the side wall of the first connecting body 1, and a tooth structure 111 is formed on the top of the protrusion 11 for cooperating with the tooth ring structure 6 of the second connecting member 4. When the connecting member and the second connecting member 4 rotate relative to each other, the tooth structure 111 cooperates with the tooth groove of the tooth ring structure 6 to increase the damping between the connecting member and the second connecting member 4; the side wall of the protrusion 11 is also formed with a snap-fitting structure 112 for forming a snap-fitting with the third connecting member 5.

[0039] Due to the meshing relationship between the tooth structure 111 and the gear ring structure 6, the damping between the connecting member and the second connecting member 4 is increased, so that the two can maintain a good stable state when there is no external force; the connecting member can also be connected with the third connecting member 5 through the clamping structure 112 of the protruding portion 11, forming a clamping state that cannot rotate in the horizontal direction. This structure has the characteristics of low manufacturing cost and simple assembly operation.

[0040] Specifically, in the embodiment of the present application, the first connector 1 includes a first cylindrical connector 13 and a second cylindrical connector 14 in a cylindrical shape. The outer diameter of the first cylindrical connector 13 is smaller than the outer diameter of the second cylindrical connector 14. A first mounting groove 141 is provided on the end surface of one side of the second cylindrical connector 14. The first cylindrical connector 13 is installed in the first mounting groove 141. The end surface of the first cylindrical connector 13 and the end surface of the second cylindrical connector 14 are not located in the same plane. It is possible that a part of the first cylindrical connector 13 is located in the first mounting groove 141, and the other part is located outside the first mounting groove 141 to form a convex structure; it is also possible that the first cylindrical connector 13 is completely located in the first mounting groove 141 to form a concave structure. In short, a step needs to be formed between the first cylindrical connector 13 and the second cylindrical connector 14, and the convex portion 11 is formed on the upper surface of the step.

[0041] In the embodiment of the present application, the side wall of the second cylindrical connector 14 is further formed with a reinforcement portion 12, and a plurality of reinforcement portions 12 are provided, and the plurality of reinforcement portions 12 are evenly spaced along the circumference of the side wall of the second cylindrical connector 14 to play a role in structural reinforcement.

[0042] Furthermore, the second connector 4 has a third cylindrical connector 41 and forms a step, but the step structure of the second connector 4 is exactly opposite to the step structure formed by the connector through the first cylindrical connector 13 and the second cylindrical connector 14. In other words, when the step of the connector is a convex structure, the step of the second connector 4 is a concave structure; when the step of the connector is a concave structure, the step of the second connector 4 is a convex structure. This allows the structure of the connector to form a buckle with the second connector 4.

[0043] In the embodiment of the present application, in order to improve the stability of the engagement between the connecting member and the second connecting member 4, the first cylindrical connector 13 is provided with a protrusion 7 or a groove 8 on the end face facing away from the first mounting groove 141, which can form a plug-in fit with the groove 8 or the protrusion 7 on the end face of the third cylindrical connector 41. That is, when the end face of the first cylindrical connector 13 is a protrusion 7, the end face of the third cylindrical connector 41 is a groove 8, and when the end face of the first cylindrical connector 13 is a groove 8, the end face of the third cylindrical connector 41 is a protrusion 7.

[0044] A specific solution in the embodiment of the present application is that a raised step is formed between the first cylindrical connector 13 and the second cylindrical connector 14 , and the surface of the first cylindrical connector 13 is provided with a groove 8 .

[0045] In order to further improve the stability of the connection member and the second connection member 4 when they are buckled together, the first cylindrical connection body 13 is a magnetic member and can be magnetically connected to the third cylindrical connection body 41.

[0046] When the first connector 1 and the second connector 4 are connected, the protrusion 7 is inserted into the groove 8, and the protrusion 7 can move along the rotation axis in the groove 8, but the protrusion 7 is always located in the groove 8, so that a good magnetic attraction can be maintained between the first cylindrical connector 13 and the third cylindrical connector 41. When the first connector 1 and the second connector 4 are rotated relative to each other, when the tooth tops of the protrusion 11 abut against the tooth tops of the tooth ring structure 6, there is a gap between the first cylindrical connector 13 and the third cylindrical connector 41, and the protrusion 7 moves out of the groove 8; when the tooth tops of the protrusion 11 are engaged with the tooth grooves of the tooth ring structure 6, the first cylindrical connector 13 and the third cylindrical connector 41 fit each other, and the protrusion 7 is completely inserted into the groove 8. In this state, there is damping between the connector and the second connector 4, so that the two can maintain a good stable state when they rotate without the aid of external force, and are not prone to movement.

[0047] Further, the number of the protrusions 11 and / or the reinforcement 12 is not restrictive, and can be multiple or one. When multiple protrusions 11 and / or reinforcements 12 are provided, they need to be arranged at intervals along the axial direction of the first connector 1. As a preferred embodiment of the present application, the protrusions 11 and the reinforcement 12 are aligned and are an integrated structure.

[0048] The way the first cylindrical connector 13 is installed in the first installation groove 141 is not restrictive. The first cylindrical connector 13 can be inserted into the first installation groove 141 by interference fit, or fixed in the first installation groove 141 by gluing.

[0049] Reference Figure 2 and Figure 3As shown, as a specific embodiment of the present application document, the specific way in which the first cylindrical connector 13 is installed in the first mounting groove 141 is that the first cylindrical connector 13 is fixedly provided with a first plug-in piece 131 on the end surface facing the first mounting groove 141. The number of the first plug-in pieces 131 is not limited, and can be one or more. In the embodiment of the present application, the number of the first plug-in pieces 131 is set to two, and the two first plug-in pieces 131 are arranged opposite to each other. The second cylindrical connector 14 is provided with a first through groove 142 at the bottom of the first mounting groove 141. The number and position of the first through grooves 142 correspond to the first plug-in piece 131. The first through groove 142 penetrates to the side of the second cylindrical connector 14 away from the first mounting groove 141. When installing the first cylindrical connector 13, the first plug-in piece 131 is passed through the first mounting groove 141, and then the two first plug-in pieces 131 are folded toward each other, so that the first cylindrical connector 13 is installed and fixed in the first mounting groove 141.

[0050] The connector also includes a second connector 2 and a third connector 3. The second connector 2 is cylindrical, and a toothed ring structure 6 is provided on the end face of one side of the second cylindrical connector 14. In the embodiment of the present application, the toothed ring structure 6 is a crown tooth in a ring shape. The second connector 2 is provided with a magnetic body 9 capable of magnetic connection on the inner side of the toothed ring structure 6. The two ends of the third connector 3 are respectively connected and fixed to the first connector 1 and the second connector 2, and the third connector 3 connects the first connector 1 and the second connector 2 in the same plane. The shape of the third connector 3 is not limited, and can be a straight line or an L-shaped. In the embodiment of the present application, the third connector 3 is a straight line.

[0051] Example 2

[0052] Reference Figure 4 and Figure 7 As shown, a connection assembly in an embodiment of the present application includes the connection member in embodiment 1, and further includes a second connection member 4 and a third connection member 5. The second connection member 4 has a toothed ring structure 6 that can mesh with the protrusion 11, and the toothed ring structure 6 is in a ring shape and is a crown tooth. The third connection member 5 can be engaged with the clamping structure 112 of the protrusion 11, so that the connection member and the third connection member 5 cannot rotate in the horizontal direction and thus reach a locked state.

[0053] Reference Figure 4 and Figure 5 As shown, in the embodiment of the present application, the second connecting member 4 includes a third cylindrical connecting body 41 and a fourth cylindrical connecting body 42, the third cylindrical connecting body 41 is a magnetic member, and the outer diameter of the third cylindrical connecting body 41 is smaller than the outer diameter of the fourth cylindrical connecting body 42, and a second mounting groove 421 is provided on the end face of one side of the fourth cylindrical connecting body 42, the third cylindrical connecting body 41 is installed in the second mounting groove 421 to form a step with the fourth cylindrical connecting body 42, and the gear ring structure 6 is located at the step.

[0054] Reference Figure 1 and Figure 4 As shown, in Example 1, since the first cylindrical connector 13 extends from the inside of the second cylindrical connector 14 to form a step of a convex structure, the third cylindrical connector 41 needs to be completely located in the second mounting groove 421, and a step of a concave structure is formed inside the fourth cylindrical connector 42. This allows the connector and the second connector 4 to be interlocked. Since the end face of the first cylindrical connector 13 is set as a groove 8 structure, the end face of the third cylindrical connector 41 is set as a convex block 7 structure that can be plugged and matched with the groove 8, and the convex block 7 and the third cylindrical connector 41 are an integral structure.

[0055] The way the third cylindrical connector 41 is installed in the second installation groove 421 is not restrictive. The third cylindrical connector 41 can be inserted into the second installation groove 421 by interference fit, or fixed in the second installation groove 421 by gluing.

[0056] Reference Figure 4 and Figure 5 As shown, in the embodiment of the present application, the specific way in which the third cylindrical connector 41 is installed in the second mounting groove 421 is that the third cylindrical connector 41 is fixedly provided with a second plug-in piece 411 on the end surface facing the second mounting groove 421. The number of the second plug-in pieces 411 is not limited, and can be one or more. In the embodiment of the present application, the number of the second plug-in pieces 411 is set to two, and the two second plug-in pieces 411 are arranged opposite to each other. The third cylindrical connector 41 is provided with a second through groove 422 at the bottom of the second mounting groove 421. The number and position of the second through groove 422 correspond to the second plug-in piece 411, and the second through groove 422 penetrates to the side of the third cylindrical connector 41 away from the second mounting groove 421. When installing the third cylindrical connector 41, the second plug-in piece 411 is passed through the second mounting groove 421, and then the two second plug-in pieces 411 are folded toward each other, so that the third cylindrical connector 41 is installed and fixed in the second mounting groove 421.

[0057] Furthermore, in the embodiment of the present application, the structure of the second connecting member 4 for cooperating with the first connecting body 1 is completely identical to the structure of the second connecting body 2 .

[0058] Reference Figure 6 and Figure 7In the embodiment of the present application, the third connecting member 5 is provided with an assembly groove 51, and the assembly groove 51 has an inner angle structure, and the inner angle corresponds to the clamping structure 112 of the protrusion 11 one by one, and is clamped with each other. As a preferred solution in the present application document, the assembly groove 51 is a square groove, and four protrusions 11 are provided. When the connecting member and the third connecting member 5 are installed, the connecting member is inserted into the assembly groove 51, so that the four protrusions 11 are clamped with the four inner angles of the assembly groove 51 through their own clamping structures 112, so that the connecting member and the third connecting member 5 cannot rotate relative to each other, so as to achieve a locked state.

[0059] Those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the embodiments of the present application. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that the present application does not apply for. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the appended claims.

Claims

1. A connector, characterized in that: The invention comprises a first connecting body (1) in a cylindrical shape, wherein a protrusion (11) is formed on the side wall of the first connecting body (1), and a tooth structure (111) is formed on the top of the protrusion (11) for cooperating with a tooth ring structure (6) of a second connecting member (4), and when the connecting member and the second connecting member (4) rotate relative to each other, the tooth grooves of the tooth structure (111) and the tooth ring structure (6) can increase the damping between the connecting member and the second connecting member (4); and the side wall of the protrusion (11) is also formed with a snap-fit ​​structure (112) for forming a snap-fit ​​with a third connecting member (5).

2. The connecting piece according to claim 1, characterized in that: The first connector (1) comprises a first cylindrical connector (13) and a second cylindrical connector (14) along its axial direction, wherein the outer diameter of the first cylindrical connector (13) is smaller than the outer diameter of the second cylindrical connector (14) so ​​that a step is formed between the first cylindrical connector (13) and the second cylindrical connector (14), the protrusion (11) is formed on the step, and a reinforcing portion (12) for reinforcing the structure is formed on the side wall of the second cylindrical connector (14).

3. The connecting piece according to claim 2, characterized in that: The raised portion (11) and the reinforced portion (12) correspond to each other along the axial direction and are formed into an integral structure.

4. The connecting piece according to claim 2, characterized in that: The first cylindrical connector (13) is a magnetically attracted part. The first cylindrical connector (13) is magnetically connected to the third cylindrical connector (41) in the second connector (4). The end face of the first cylindrical connector (13) is provided with a protrusion (7) or a groove (8), which can form a plug-in fit with the groove (8) or the protrusion (7) on the end face of the third cylindrical connector (41). During the rotation of the connector and the second connector (4), the protrusion (7) can slide relatively in the groove (8) along the direction of the rotation axis, and the protrusion (7) is always located in the groove (8).

5. The connecting piece according to claim 2, characterized in that: The protrusion (11) and / or the reinforcement (12) are provided in plurality and are arranged at intervals in the circumferential direction along the step formed between the first cylindrical connector (13) and the second cylindrical connector (14).

6. The connecting piece according to claim 2, characterized in that: A first mounting groove (141) for mounting the first cylindrical connector (13) is provided on one end surface of the second cylindrical connector (14); a first through groove (142) penetrating to the other end surface of the second cylindrical connector (14) is provided on the bottom wall of the first mounting groove (141); a first inserting piece (131) is fixedly provided on the end surface of one side of the first cylindrical connector (13); the first inserting piece (131) passes through the first through groove (142) and is folded to the side of the second cylindrical connector (14) facing away from the first mounting groove (141).

7. The connecting piece according to any one of claims 2 to 6, characterized in that: It also includes a cylindrical second connector (2) and a third connector (3) for horizontally connecting the first connector (1) and the second connector (2), wherein the second connector (2) has a toothed ring structure (6) identical to the second connector (4) and a magnetic attraction body (9) capable of magnetic connection.

8. A connection assembly, characterized in that: include: The connecting piece according to any one of claims 2 to 7, A second connecting member (4) having a toothed ring structure (6) for cooperating with the toothed structure (111) of the protruding portion (11); The third connecting member (5) is configured to form a snap-fit ​​fit with the snap-fit ​​structure (112) of the protruding portion (11).

9. A connection assembly according to claim 8, characterized in that: The second connecting member (4) comprises a third cylindrical connecting body (41) and a fourth cylindrical connecting body (42); the third cylindrical connecting body (41) is a magnetic attraction member; the outer diameter of the third cylindrical connecting body (41) is smaller than the outer diameter of the fourth cylindrical connecting body (42) so that a step is formed between the third cylindrical connecting body (41) and the fourth cylindrical connecting body (42); the first cylindrical connecting body (13) can be interlocked with the third cylindrical connecting body (41) and magnetically connected; one end surface of the fourth cylindrical connecting body (42) A second mounting groove (421) for mounting the third cylindrical connector (41) is provided, and a second through groove (422) penetrating to the other end face of the second cylindrical connector (14) is provided on the bottom wall of the first mounting groove (141) of the fourth cylindrical connector (42), and a second plug-in piece (411) is fixedly provided on the end face of one side of the third cylindrical connector (41), and the second plug-in piece (411) passes through the second through groove (422) and is folded to the side of the second cylindrical connector (14) facing away from the second mounting groove (421).

10. A connection assembly according to claim 9, characterized in that: The third connecting member (5) is provided with an assembly groove (51) inside, the assembly groove (51) having an inner angle structure, the connecting member can be inserted into the assembly groove (51), and the clamping structure (112) of the protruding portion (11) can be clamped with the inner angle of the assembly groove (51).

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