Terminal assembly, and male head mechanism, female seat mechanism and circular connector using same

Abstract

The utility model discloses a terminal assembly, and a male head mechanism, a female seat mechanism and a circular connector using the same. The terminal assembly comprises a first terminal unit and a second terminal unit arranged on the periphery of the first terminal unit. According to the utility model, the second terminal unit is arranged at the outer side of the first terminal unit to form the terminal assembly, the first terminal unit and the second terminal unit can be respectively prepared and then are connected with a cable to be assembled to obtain the terminal assembly, the operation space is not limited during wiring, the mechanical operation is convenient to use, the wiring process is simplified, and the wiring efficiency is improved. The production cost is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of connectors, and in particular relates to a terminal assembly and a male head mechanism, a female seat mechanism and a circular connector using the terminal assembly. Background Art

[0002] Circular connectors are a very important type of connector. They are named because of their basic circular structure and circular mating surface. They originated from the equipment manufacturing industry in the last century and gradually extended to the civilian field. Circular connectors are mainly composed of contacts, insulators, shells, locking mechanisms and accessories. They provide power, signal and data connection transmission for various equipment and systems. At present, they are widely used in military, aviation, medical, industrial and other fields.

[0003] Existing circular connectors often insert a cylindrical terminal body into an insulator and then match it with a corresponding shell. Due to the size limitations of the terminal body and the insulator, the operating space is limited when wiring on the terminal body, and only manual wiring can be used, which has low production efficiency and is prone to wiring errors. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a terminal assembly, which solves the problems of limited operating space during wiring of existing terminal assemblies, manual wiring only, low production efficiency, and easy wiring errors.

[0005] The utility model also aims to provide a male head mechanism using the above terminal assembly.

[0006] The utility model also aims to provide a female seat mechanism using the above terminal assembly.

[0007] The utility model also aims to provide a circular connector using the terminal assembly.

[0008] In order to achieve the above-mentioned purpose, the first technical solution of the utility model is implemented as follows: a terminal assembly includes a first terminal unit and a second terminal unit arranged on the periphery of the first terminal unit.

[0009] Furthermore, the first terminal unit includes a first insulator and a first terminal piece inserted into the first insulator.

[0010] Furthermore, the first terminal member includes a coaxial member and at least two first terminal bodies.

[0011] Furthermore, the second terminal unit includes at least two terminal modules, and the at least two terminal modules are arranged on the outer circumference of the first terminal unit.

[0012] Further, the terminal module includes a second terminal body and a first connecting member for fixing the second terminal body, and the first connecting member is cooperatively connected with the first terminal unit.

[0013] Further, the terminal assembly further includes an additional terminal unit, and the additional terminal unit is disposed between the first terminal unit and the second terminal unit.

[0014] Further, the additional terminal unit includes at least two additional modules, and at least two of the additional modules are disposed on the outer circumference of the first terminal unit and below the terminal module.

[0015] Further, the additional module includes an additional terminal body and a second connecting member for fixing the additional terminal body, and the second connecting member is cooperatively connected with the second terminal unit.

[0016] Further, a first clamping groove is provided at a position corresponding to the outer peripheral edge of the first insulator and the additional terminal body, and one side of the additional terminal body close to the first insulator is located in the first clamping groove.

[0017] Further, a second insulator is provided between the additional terminal body and the second terminal body.

[0018] Further, a second clamping groove and a third clamping groove are respectively provided on the inner peripheral edge and the outer peripheral edge of the second insulator, one side of the additional terminal body close to the second insulator is located in the second clamping groove, and one side of the second terminal body close to the second insulator is located in the third clamping groove.

[0019] Further, the ends of the second terminal body and the additional terminal body are flat or bent to form a raised portion.

[0020] The second technical solution of the present utility model is implemented as follows: A male head mechanism includes a male head housing and the above-mentioned terminal assembly, and the terminal assembly is disposed in the male head housing.

[0021] The third technical solution of the present utility model is implemented as follows: A female socket mechanism includes a female socket housing, a fixing member, and the above-mentioned terminal assembly, and the terminal assembly is disposed in the female socket housing through the fixing member.

[0022] The fourth technical solution of the present utility model is implemented as follows: A circular connector includes the above-mentioned male head mechanism and female socket mechanism, and the male head mechanism is adapted to the female socket mechanism.

[0023] Further, a clamping groove is provided on the male head housing, and a clamping member matching with the clamping groove is provided on the female seat housing; or a clamping groove is provided on the female seat housing, and a clamping member matching with the clamping groove is provided on the male head housing.

[0024] Further, at least two tightening pieces arranged circumferentially are provided with gaps at one ends of the male head housing and the female seat housing away from each other, and the outer sides of the tightening pieces are abutted against the inner side of the end cap.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows: The second terminal unit is arranged outside the first terminal unit to form a terminal assembly. The first terminal unit and the second terminal unit can be respectively prepared, and then assembled with the cable connected to obtain the terminal assembly. The operation space is not limited during wiring, which is convenient for mechanical operation, simplifies the wiring process, reduces the production cost and improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a terminal assembly provided in Embodiment 1 of the present utility model;

[0027] Figure 2 It is a structural diagram of the first terminal unit in the terminal assembly provided in Embodiment 1 of the present utility model;

[0028] Figure 3 It is a structural diagram of the second terminal unit in the terminal assembly provided in Embodiment 1 of the present utility model;

[0029] Figure 4 It is a structural diagram of another terminal assembly provided in Embodiment 1 of the present utility model;

[0030] Figure 5 It is a structural diagram of the first terminal unit in another terminal assembly provided in Embodiment 1 of the present utility model;

[0031] Figure 6 It is a structural diagram of the second terminal unit in another terminal assembly provided in Embodiment 1 of the present utility model;

[0032] Figure 7 It is a structural diagram of the male head mechanism provided in Embodiment 2 of the present utility model;

[0033] Figure 8 It is an exploded view of the male head mechanism provided in Embodiment 2 of the present utility model;

[0034] Figure 9 It is a sectional view of the male head mechanism provided in Embodiment 2 of the present utility model;

[0035] Figure 10 It is a structural diagram of the female seat mechanism provided in Embodiment 3 of the present utility model;

[0036] Figure 11 Exploded view of the female socket mechanism provided in Embodiment 3 of the present utility model;

[0037] Figure 12 Cross-sectional view of the female socket mechanism provided in Embodiment 3 of the present utility model;

[0038] Figure 13 Structural diagram of the circular connector provided in Embodiment 4 of the present utility model.

[0039] In the figure, 1 - first terminal unit, 11 - first insulator, 111 - first clamping groove, 12 - first terminal part, 121 - coaxial part, 122 - first terminal body;

[0040] 2 - second terminal unit, 21 - terminal module, 211 - first connecting part, 212 - second terminal body, 2121 - protruding part;

[0041] 3 - additional terminal unit, 31 - additional module, 311 - additional terminal body, 312 - second connecting part;

[0042] 4 - second insulator, 41 - second clamping groove, 42 - third clamping groove;

[0043] 5 - male head housing, 51 - clamping groove, 6 - female socket housing, 61 - clamping part, 7 - fixing part, 8 - tightening piece, 9 - tail cover. Detailed implementation manners

[0044] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0045] In the description of the present utility model, it should be clear that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and does not mean that the indicated device or element must have a specific orientation or position. Therefore, it should not be construed as a limitation to the present utility model. In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] Embodiment 1

[0047] As Figure 1 , Figure 4 shown, the terminal assembly provided in this embodiment includes a first terminal unit 1 and a second terminal unit 2 disposed on the outer periphery of the first terminal unit 1.

[0048] In existing circular connectors, the terminal body is usually inserted into the insulator to form a terminal assembly, and then the female seat mechanism and the male head mechanism with the adapted terminal assembly are plugged together to achieve the connection and transmission of power, signals and data. This structure is limited by the sizes of the terminal body and the insulator during preparation, resulting in a narrow space for wiring operations on the terminal body. Mechanized operation is not possible, and only manual wiring can be performed, increasing the production cost of the terminal assembly and reducing the production efficiency.

[0049] Based on the above structure, in the present utility model, the second terminal unit 2 is disposed outside the first terminal unit 1 to form a terminal assembly. During preparation, the first terminal unit 1 and the second terminal unit 2 can be prepared separately and then assembled, facilitating wiring operations on the first terminal unit 1 and the second terminal unit 2. The space for wiring operations is not limited, and mechanized operation is convenient, reducing the production cost and improving the processing efficiency.

[0050] In some embodiments of the present application, as Figure 2 , Figure 5 shown, the first terminal unit 1 includes a first insulator 11 and a first terminal member 12 inserted into the first insulator 11.

[0051] In this embodiment, by providing the first insulator 11, the first terminal members 12 are arranged at the required positions and intervals, and do not tilt during use, avoiding current leakage and crosstalk between multiple first terminal members 12, and ensuring the transmission quality of power, signals and data.

[0052] Specifically, the first insulator 11 is provided as one or two. When provided as two, the two first insulators 11 are arranged along their axial directions, and a limiting member is provided at the connection of the two first insulators 11 on the first terminal member 12. By fixing the limiting member between the two first insulators 11, the connection stability of the first terminal member 12 in the first insulator 11 is ensured.

[0053] In some embodiments of the present application, the first terminal member 12 includes a coaxial member 121 and at least two first terminal bodies 122.

[0054] In this embodiment, the coaxial member 121 is determined according to the user's usage requirements, and one or two groups are selected. By providing the coaxial member 121, when using this terminal assembly in a radio frequency device, there is sufficient impedance matching between the terminal assembly and the radio frequency device, and the usage effect is good.

[0055] The first terminal body 122 is provided with 2 to 100 cylindrical terminals, all of which are machined or stamped and rounded. When a stamped and rounded terminal is used, an unfolded piece of the first terminal body 122 is made on a plate through a stamping process, and then the unfolded piece is made into a hollow cylindrical first terminal body 122 through a rounding process, which can save consumables, and has a simple preparation process, low cost, and short time. The prepared first terminal bodies 122 are connected through plates. During assembly, the first terminal body 122 is placed in the first insulator 11 by clamping the plate connection and rotating the plate, and finally the first terminal bodies 122 connected by the plate are separated. This process can be performed mechanically without causing any loss, thereby improving assembly efficiency and reducing losses.

[0056] like Figure 3 , Figure 6 As shown, in some embodiments of the present application, the second terminal module 2 includes at least two terminal modules 21 , and the at least two terminal modules 21 are arranged on the outer circumference of the first terminal unit 1 .

[0057] In this embodiment, at least two terminal modules 21 are arranged in a ring and disposed on the outer circumference of the first terminal unit 1. When in use, the number of terminal modules 21 in the second terminal unit 2 can be increased or decreased according to the user's requirements for PIN positions.

[0058] In some embodiments of the present application, the terminal module 21 includes a second terminal body 212 and a first connecting member 211 for fixing the second terminal body 212 , and the first connecting member 211 is cooperatively connected with the first terminal unit 1 .

[0059] In this embodiment, the first connecting member 211 is an arc-shaped structure, and at least one second terminal body 212 is passed through the first connecting member 211, specifically 4-10. When preparing the terminal assembly, the second terminal body 212 in the first connecting member 211 is firstly wired, and then each first connecting member 211 is arranged on the outer periphery of the first insulator 11 in the first terminal unit 1, so as to avoid errors during wiring and improve the production efficiency of the terminal assembly.

[0060] Moreover, in this embodiment, the second terminal body 212 is a flat structure prepared by stamping, which has a relatively small requirement on the thickness of the first connecting piece 211, and the first connecting piece 211 is circumferentially arranged on the outside of the first insulator 11, with a larger arrangement space, and a larger number of second terminal bodies 212 can be arranged to meet the use requirements of different equipment.

[0061] In some embodiments of the present application, the terminal assembly further includes an additional terminal unit 3 , and the additional terminal unit 3 is disposed between the first terminal unit 1 and the second terminal unit 2 .

[0062] This embodiment increases the number of PIN positions in the terminal assembly by providing an additional terminal unit 3 so as to arrange more terminal bodies to meet the use requirements of different devices.

[0063] In some embodiments of the present application, the additional terminal unit 3 includes at least two additional modules 31 , and the at least two additional modules 31 are arranged on the outer circumference of the first terminal unit 1 and are located below the terminal module 21 .

[0064] In this embodiment, at least two additional modules 31 are assembled into a ring-shaped additional terminal unit 3, which is then arranged between the first insulator 11 and the second terminal unit 2 in the first terminal unit 1. When in use, the number of additional modules 31 in the additional terminal unit 3 can be increased or decreased according to the user's demand for the number of PIN positions.

[0065] In some embodiments of the present application, the additional module 31 includes an additional terminal body 311 and a second connecting member 312 for fixing the additional terminal body 311 , and the second connecting member 312 is cooperatively connected with the second terminal unit 2 .

[0066] In this embodiment, the second connecting piece 312 is an arc-shaped structure, and at least one additional terminal body 311 is inserted into the second connecting piece 312, specifically 4-10. When preparing the terminal assembly, several additional terminal bodies 311 are first inserted into the second connecting piece 312, and several second terminal bodies 212 are inserted into the first connecting piece 211. Then, the second terminal body 212 and the additional terminal body 311 are fixed by fixing the first connecting piece 211 and the second connecting piece 312, so as to facilitate wiring operations. After the wiring is completed, the second connecting piece 312 and the first connecting piece 211 are sequentially arranged on the outer periphery of the first insulator 11 in the first terminal unit 1, so as to avoid wiring errors and improve the production efficiency of the terminal assembly.

[0067] In some embodiments of the present application, a first locking groove 111 is provided at a position on the outer periphery of the first insulator 11 corresponding to the additional terminal body 311 , and a side of the additional terminal body 311 close to the first insulator 11 is located in the first locking groove 111 .

[0068] In this embodiment, the first locking groove 111 is provided to restrict the additional terminal body 311 , thereby preventing the additional terminal body 311 from being offset along the circumferential direction of the first insulator 11 during use, thereby ensuring the stability of the additional terminal body 311 .

[0069] In some embodiments of the present application, a second insulator 4 is disposed between the additional terminal body 311 and the second terminal body 212 .

[0070] In this embodiment, the second insulator 4 is provided to ensure the insulation performance between the second terminal unit 2 and the additional terminal unit 3, avoiding current leakage and crosstalk between the second terminal body 212 in the second terminal unit 2 and the additional terminal body 311 in the additional terminal unit 3, and ensuring the transmission quality of power supply, signals, and data.

[0071] In some embodiments of the present application, a second clamping groove 41 and a third clamping groove 42 are respectively provided on the inner peripheral edge and the outer peripheral edge of the second insulator 4. The side of the additional terminal body 311 close to the second insulator 4 is located in the second clamping groove 41, and the side of the second terminal body 212 close to the second insulator 4 is located in the third clamping groove 42.

[0072] In this embodiment, the additional terminal body 311 inside the second insulator 4 is restricted by setting the second clamping groove 41, and the second terminal body 212 outside the second insulator 4 is restricted by setting the third clamping groove 42, avoiding their circumferential offset along the second insulator 4 during use and ensuring the stability of the additional terminal body 311 and the second terminal body 212.

[0073] In some embodiments of the present application, the ends of the second terminal body 212 and the additional terminal body 311 are flat or bent to form a raised portion 2121.

[0074] During the use of the terminal assembly, the terminal assembly in the female socket mechanism needs to be inserted into the terminal assembly in the male head mechanism to achieve the connection and transmission of power supply, signals, and data. In this embodiment, the ends of the second terminal body 212 and the additional terminal body 311 are set to be flat or bent to form a raised portion 2121. When the ends of the second terminal body 212 and the additional terminal body 311 in the female socket mechanism are flat, the ends of the second terminal body 212 and the additional terminal body 311 in the male head mechanism are bent to form a raised portion 2121, or vice versa; during connection, the raised portions 2121 of the second terminal body 212 and the additional terminal body 311 are in stable contact with the flat ends of another second terminal body 212 and the additional terminal body 311, ensuring the transmission quality of power supply, signals, and data.

[0075] The ends of the second terminal body 212 and the additional terminal body 311 in the same terminal assembly are the same or different, and there is a circumferential misalignment between the second terminal body 212 and the additional terminal body 311, avoiding current leakage and crosstalk between them and ensuring the transmission quality of power supply, signals, and data.

[0076] Embodiment 2

[0077] Such as Figure 7 、 Figure 8As shown, the male connector assembly includes a male connector housing 5 and the terminal assembly described in Embodiment 1, and the terminal assembly is disposed within the male connector housing 5.

[0078] Specifically, the male connector housing 5 is an integrally formed cylindrical housing, or is formed by threadedly connecting a front male housing and a rear male housing along their axial directions. When formed by threadedly connecting the front male housing and the rear male housing, it is convenient to assemble the terminal assembly therein.

[0079] Embodiment 3

[0080] As Figure 10 、 Figure 11 shown, the female connector assembly includes a female connector housing 6, a fixing member 7, and the terminal assembly described in Embodiment 1, and the terminal assembly is disposed within the female connector housing 6 through the fixing member 7.

[0081] Specifically, the female connector housing 6 is an integrally formed cylindrical housing, or is formed by threadedly connecting a front female housing and a rear female housing along their axial directions. When formed by threadedly connecting the front female housing and the rear female housing, it is convenient to assemble the terminal assembly therein.

[0082] Embodiment 4

[0083] As Figure 13 shown, the circular connector includes the male connector assembly described in Embodiment 2 and the female connector assembly described in Embodiment 3, and the male connector assembly is adapted to the female connector assembly.

[0084] In this embodiment, the male connector assembly is adapted to the female connector assembly, specifically manifested in that the male connector housing 5 and the female connector housing 6 are adapted at the connection portion, and the ends of the coaxial member 121, the first terminal body 122, the second terminal body 212, and the additional terminal body 311 in the terminal assembly of the male connector assembly are adapted to the ends of the coaxial member 121, the first terminal body 122, the second terminal body 212, and the additional terminal body 311 in the terminal assembly of the female connector assembly.

[0085] Specifically, when the end of the second terminal body 212 in the male connector assembly is flat, a protruding portion 2121 is formed at the end of the second terminal body 212 in the female connector assembly; when the end of the second terminal body 212 in the female connector assembly is flat, a protruding portion 2121 is formed at the end of the second terminal body 212 in the male connector assembly.

[0086] When the end of the additional terminal body 311 in the male connector assembly is flat, a protruding portion 2121 is formed at the end of the additional terminal body 311 in the female connector assembly; when the end of the additional terminal body 311 in the female connector assembly is flat, a protruding portion 2121 is formed at the end of the additional terminal body 311 in the male connector assembly.

[0087] As Figure 9 、Figure 12 As shown, in some embodiments of the present application, a card slot 51 is provided on the male housing 5, and a card member 61 that cooperates with the card slot 51 is provided on the female housing 6; or a card slot 51 is provided on the female housing 6, and a card member 61 that cooperates with the card slot 51 is provided on the male housing 5.

[0088] In this embodiment, the card slot 51 and the card member 61 are connected in cooperation to improve the connection strength between the male head mechanism and the female seat mechanism, prevent the two from separating during use, and ensure the stability of the connection and transmission of power, signals, and data.

[0089] Specifically, the card member 61 is at least one card block arranged circumferentially and at intervals, preferably three. The card slot 51 is an arc-shaped slot with a notch corresponding to the position of the card member 61. During use, the card block is pushed into the arc-shaped slot through the notch, and the arc-shaped slot is rotated relative to the card block so that the card block is clamped at the bottom of the arc-shaped slot and is misaligned with the notch to achieve clamping.

[0090] In some embodiments of the present application, at least two tightening pieces 8 arranged circumferentially are provided at intervals at the ends of the male housing 5 and the female housing 6 that are far away from each other, and the outer sides of the tightening pieces 8 are in contact with the inner sides of the end caps 9.

[0091] One end of the female seat mechanism and one end of the male head mechanism in the circular connector are inserted into each other, and the other end is connected to a cable. That is, the cable passes through the male housing 5 and the female housing 6 and is connected to the terminal assembly inside. During use, due to external pulling, the terminal assembly is likely to separate from the cable, resulting in an interruption of the connection and transmission; in this embodiment, at least two tightening pieces 8 are provided at the ends of the female housing 6 and the male housing 5 that are far away from each other, and the end cap 9 is used to tighten or loosen the tightening pieces 8, indirectly loosening or tightening the cable passing through the tightening pieces 8, improving the connection strength between the cable and the female housing 6 and the male housing 5, and ensuring the transmission quality of power, signals, and data.

[0092] Specifically, an annular sealing ring is further provided inside the clamping piece 8 to protect the cable and prevent dust, water vapor, etc. from entering the connector from the end cap 9, ensuring the waterproof and dustproof effect of the connector.

[0093] The usage method of the circular connector provided in this embodiment is specifically as follows:

[0094] Before use, insert the first terminal part 12 into the first insulator 11, set the second terminal body 212 in the first connecting part 211, insert the additional terminal body 311 into the second connecting part 312, then connect the cables to the first terminal part 12, the second terminal body 212, and the additional terminal body 311 respectively. Finally, set the second connecting part 312 and the first connecting part 211 on the outer peripheral edge of the first insulator 11 in sequence to complete the assembly of the terminal component.

[0095] Set the terminal component in the male housing 5 and the female housing 6 respectively to form a male head mechanism and a female seat mechanism, and insert the male head mechanism and the female seat mechanism into each other. Specifically: after aligning the coaxial parts 121 in the male head mechanism and the female seat mechanism, engage the clamping part 61 with the clamping groove 51. The first terminal body 122, the second terminal body 212, and the additional terminal body 311 in the male head mechanism contact the first terminal body 122, the second terminal body 212, and the additional terminal body 311 in the female seat mechanism to achieve the connection and transmission stability of power supply, signal, and data.

[0096] As described above, it is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A terminal assembly, characterized in that: It comprises a first terminal unit (1) and a second terminal unit (2) arranged on the periphery of the first terminal unit (1).

2. A terminal assembly according to claim 1, characterized in that: The first terminal unit (1) comprises a first insulator (11) and a first terminal piece (12) inserted into the first insulator (11).

3. A terminal assembly according to claim 2, characterized in that: The first terminal member (12) comprises a coaxial member (121) and at least two first terminal bodies (122).

4. A terminal assembly according to claim 2, characterized in that: The second terminal unit (2) comprises at least two terminal modules (21), and the at least two terminal modules (21) are arranged on the outer circumference of the first terminal unit (1).

5. A terminal assembly according to claim 4, characterized in that: The terminal module (21) comprises a second terminal body (212) and a first connecting member (211) for fixing the second terminal body (212), and the first connecting member (211) is cooperatively connected with the first terminal unit (1).

6. A terminal assembly according to claim 5, characterized in that: The terminal assembly further comprises an additional terminal unit (3), wherein the additional terminal unit (3) is arranged between the first terminal unit (1) and the second terminal unit (2).

7. A terminal assembly according to claim 6, characterized in that: The additional terminal unit (3) comprises at least two additional modules (31), and the at least two additional modules (31) are arranged on the outer circumference of the first terminal unit (1) and are located below the terminal module (21).

8. A terminal assembly according to claim 7, characterized in that: The additional module (31) comprises an additional terminal body (311) and a second connecting member (312) for fixing the additional terminal body (311), and the second connecting member (312) is cooperatively connected with the second terminal unit (2).

9. A terminal assembly according to claim 8, characterized in that: A first locking groove (111) is provided at a position on the outer periphery of the first insulator (11) corresponding to the additional terminal body (311), and a side of the additional terminal body (311) close to the first insulator (11) is located in the first locking groove (111).

10. A terminal assembly according to claim 9, characterized in that: A second insulator (4) is provided between the additional terminal body (311) and the second terminal body (212).

11. A terminal assembly according to claim 10, characterized in that: The inner periphery and the outer periphery of the second insulator (4) are respectively provided with a second locking groove (41) and a third locking groove (42); a side of the additional terminal body (311) close to the second insulator (4) is located in the second locking groove (41), and a side of the second terminal body (212) close to the second insulator (4) is located in the third locking groove (42).

12. A terminal assembly according to claim 10, characterized in that: The ends of the second terminal body (212) and the additional terminal body (311) are flat or bent to form a protrusion (2121).

13. A male head mechanism, characterized in that: It comprises a male plug housing (5) and a terminal assembly according to any one of claims 1 to 12, wherein the terminal assembly is arranged in the male plug housing (5).

14. A female seat mechanism, characterized in that: It comprises a female socket housing (6), a fixing member (7) and a terminal assembly according to any one of claims 1 to 12, wherein the terminal assembly is arranged in the female socket housing (6) through the fixing member (7).

15. A circular connector, characterized in that: It comprises the male head mechanism as described in claim 13 and the female seat mechanism as described in claim 14, and the male head mechanism is adapted to the female seat mechanism.

16. A circular connector according to claim 15, characterized in that: The male housing (5) is provided with a card slot (51), and the female housing (6) is provided with a card member (61) that matches the card slot (51); or the female housing (6) is provided with a card slot (51), and the male housing (5) is provided with a card member (61) that matches the card slot (51).

17. A circular connector according to claim 16, characterized in that: At least two tightening plates (8) arranged circumferentially are provided in a gap at one end of the male housing (5) and the female housing (6) that are away from each other, and the outer side of the tightening plates (8) abuts against the inner side of the tail cover (9).

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