A small-size high-frequency connector based on elastic needle and reed structure

Abstract

The application discloses a small-pitch high-plate radio frequency connector based on an elastic needle and a reed structure, which comprises an outer conductor, an inner conductor and an insulator, the outer conductor is provided with an elastic part, a mounting part and a fixing part, the elastic part and the fixing part are connected through the mounting part, the inner conductor comprises a telescopic head, a limiting cylinder and an elastic part, the telescopic head is connected to the limiting cylinder through the elastic part, the elastic part is located in the limiting cylinder, and the insulator is arranged between the outer conductor and the inner conductor. According to the application, the elastic part is arranged on the outer conductor, and the elastic part is arranged on the inner conductor, so that the outer conductor and the inner conductor can be appropriately telescopic, thereby adapting to different intervals of two PCBs.

Description

Technical Field

[0001] This invention belongs to the field of board-to-board connectors, specifically relating to a low-profile board-to-board radio frequency connector based on an elastic pin and spring structure. Background Technology

[0002] Currently, there are two main design schemes for commonly used board-to-board connectors on the market: one is based on two-piece quick-connect or quick-connect self-locking interfaces, such as the SMB and MCX series; the other is based on three-piece quick-connect or quick-connect self-locking interfaces, such as the MBX, SMP, and SMP-MAX. The first type of connector allows for slight offsets between the two circuit boards in both the lateral and longitudinal directions. Compared to the first type, the second type significantly increases the allowable value for positional deviations between the two circuit boards. However, it is difficult to meet the interconnection requirements of ultra-small board pitches, especially when the board pitch is less than 5mm. In such ultra-small board pitch cases, the machining difficulty increases significantly, thereby reducing production efficiency and increasing costs.

[0003] Traditional inter-board RF connectors typically have a height greater than 10mm, and contain a large number of components, resulting in high costs. Summary of the Invention

[0004] This invention proposes an inter-board radio frequency connector that achieves large radial and axial floating deformation through inner and outer conductors with elastic deformation, in order to absorb the dimensional chain accumulation deviation under board-to-board interconnection. At the same time, it has stable contact resistance and elastic recoverability, good standing wave and insertion loss characteristics, and can realize stable transmission of radio frequency signals.

[0005] To address the aforementioned problems in the existing technology, the technical solution adopted by this invention is as follows:

[0006] A low-profile inter-board radio frequency connector based on a flexible pin and spring structure includes an outer conductor, an inner conductor, and an insulator.

[0007] The outer conductor has an elastic part, a support part, and a fixing part, and the elastic part and the fixing part are connected by the support part.

[0008] The inner conductor includes a telescopic head, a limiting cylinder, and an elastic component. The telescopic head is connected to the limiting cylinder through the elastic component, and the elastic component is located inside the limiting cylinder.

[0009] The insulator is located between the outer conductor and the inner conductor.

[0010] By setting an elastic part in the outer conductor and an elastic component in the inner conductor, the outer and inner conductors can expand and contract appropriately to accommodate different spacings between the two PCB boards.

[0011] The fixing part and the limiting cylinder are both welded to one of the PCB boards, and the elastic part and the telescopic head abut against the other PCB board. Since the outer conductor and the inner conductor are stably connected to the PCB board, they can play a good role in conducting electricity.

[0012] Traditional connectors connect two connectors to two PCBs respectively, and then connect the two connectors through an adapter. However, this application sets up an elastic part so that one end of the connector is soldered to the PCB and the other end of the connector abuts against the PCB, which greatly reduces the size of the original connector.

[0013] Furthermore, the low-profile board connector based on the elastic pin and spring structure includes an outer conductor, an inner conductor, and an insulator. The outer conductor is composed of multiple spring structures; the inner conductor is an elastic pin structure, which consists of a fixed conductor (limiting cylinder), a sliding conductor (telescopic head), and an elastic component. The elastic component is located between the fixed conductor and the sliding conductor, and the outer wall of the fixed conductor has a barb-like structure that interferes with the insulator; the insulator is used to support and install the inner and outer conductors. The shape of the spring varies depending on the requirements such as connector position deviation. Two elastic parts are provided, symmetrically connected to both sides of the support part. By setting two elastic parts, the elastic parts abut against the PCB board, ensuring the stability of the connection with the PCB board.

[0014] Furthermore, the limiting cylinder is provided with a telescopic cavity, one end of which is a closed end and the other end of which is an open end. The elastic component is located on the side of the telescopic cavity near the closed end, and the protruding head is located on the side of the telescopic cavity near the open end. By providing the telescopic cavity, the telescopic head can slide within the telescopic cavity. When the telescopic head is compressed, it will deflect and contact the interior of the telescopic cavity, thereby enabling the inner conductor to conduct electricity. The open end is provided with a constriction structure. The telescopic head includes a contact end and a limiting end. The limiting end is located within the telescopic cavity and abuts against the elastic component. The contact end protrudes from the constriction structure. By providing the constriction structure, the telescopic head will not pop out of the telescopic cavity. At the same time, the elastic component can be contracted by compressing the telescopic head to adapt to changes in the spacing between the two PCB boards. The elastic component is a spring.

[0015] Furthermore, the inner conductor is connected to the middle of the insulator, and the outer conductor is connected to the outside of the insulator. Placing the inner conductor in the middle of the insulator and the outer conductor on the outside of the insulator effectively avoids contact between the inner and outer conductors, while also not affecting the elastic deformation of the inner and outer conductors. The insulator is provided with a positioning plate and a positioning groove, and the support part is provided with a tightening plate. The positioning plate is used to engage the upper end of the support part, and the positioning groove is used to engage the tightening plate. By setting the positioning plate, the outer conductor can be prevented from sliding out from the upper end of the insulator. By setting the positioning groove and the tightening plate, the outer conductor can be prevented from sliding out from the lower end of the insulator. There are two positioning plates, which are located on opposite sides of the insulator, and there are two positioning grooves, which are located on opposite sides of the insulator.

[0016] Furthermore, the insulator is a rectangular body with two positioning slots and two positioning plates on its four sides. Placing the positioning plates and slots around the insulator makes the connection between the insulator and the outer conductor more secure and improves overall integrity. The tightening plate is a U-shaped structure cut from the support part. During installation, the outer conductor is first inserted from below the insulator, so that the upper end of the support part presses against the positioning plate. Then, the tightening plate is pressed down, so that the lower end of the tightening plate is engaged with the positioning slot, completing the connection between the outer conductor and the insulator. Alternatively, the insulator can be without positioning plates, with two upward-facing positioning slots and an upward-facing tightening plate at the connection part, using the same structure of tightening plates and positioning slots for positioning.

[0017] Furthermore, the spring structure (elastic part) is an integral structure, formed by stamping high-strength, high-elasticity copper alloy. The spring structure includes a contact section, an auxiliary support section, a transition section, a surface-mount soldering section, a deformation section, and a mounting section. The contact section is connected to the surface-mount soldering section through the auxiliary support section and the transition section. The surface-mount soldering section is connected to the mounting section through the deformation section. The contact section is in the form of line contact or point contact. The width of the auxiliary support section gradually decreases from the transition section to the contact section. The transition section is an arc-shaped strip structure that transitions between the surface-mount soldering section and the auxiliary support section. The characteristic of the spring structure is that the width gradually decreases along the surface-mount soldering section, the transition section, and the auxiliary support section. In the free state, the surface-mount soldering section and the solder body are parallel to each other. By changing the arrangement and combination of the spring structure, different inter-board connector structural requirements, positional deviation requirements, and signal transmission longitudinal and transverse tolerance requirements can be met.

[0018] Furthermore, the elastic part is provided in four sections, which are centrally symmetrical about the inner conductor. This enables RF interconnection when the board spacing requirement is less than 5mm, while improving the horizontal and vertical tolerance of signal transmission. The structure is simple, has high production efficiency, and low cost, ensuring stable interconnection between boards. The outer conductor spring structure is integrally processed and ultimately bent. By changing the number of deformable parts, it can meet the connector design requirements of different board spacings and positional deviations. The arrangement and combination of the springs can be changed to achieve a stable connection of the RF connector structure between boards.

[0019] Furthermore, the elastic part includes a deformable part, a contact section, and a connecting part. The connecting part is connected to the mounting part, and the contact section is connected to the connecting part through the deformable part. Through the deformation of the deformable part, the elastic part can adapt to PCB boards with different spacing. The deformable part includes a first deformable part and a second deformable part that are connected to each other. The first deformable part is a bent "S"-shaped structure, and the second deformable part is a bent "S"-shaped structure. By setting the first deformable part and the second deformable part, multiple deformations can be achieved when subjected to pressure, thereby improving the stress resistance.

[0020] Furthermore, the first deformable part is an external structure, and the second deformable part is an internal structure. The external structure corresponds to the internal structure. The external structure refers to the two bent "S"-shaped structures located on the outside, and the internal structure refers to the "S"-shaped structure located in the middle. When the deformable part is compressed, the "S"-shaped structure of the second deformable part will be located between the two "S"-shaped structures of the first deformable part, thus having a larger deformation range.

[0021] Furthermore, both the first and second deformable parts are external structures. The external structure refers to the two bent "S"-shaped structures located on the outside. When the deformable parts are compressed, the "S"-shaped structure of the first deformable part will press on the upper side of the "S"-shaped structure of the second deformable part, thereby having better stress performance.

[0022] The present invention has the following beneficial effects: By designing an inter-board RF connector based on an elastic pin and spring structure, the connector significantly improves the allowable positional deviation between two circuit boards with a small height (<5mm), meaning that it has a certain lateral and longitudinal tolerance capability during signal transmission, realizing RF interconnection functionality with ultra-small board spacing. Thanks to its simple structural design, it can be manufactured using a continuous die high-speed stamping process, giving it production efficiency and cost advantages that are difficult for traditional connectors to match. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0024] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0025] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 .

[0026] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0027] Figure 5 This is a schematic diagram of the structure of Example 4.

[0028] Figure 6 This is a schematic diagram of the structure of Example 5.

[0029] Figure 7 This is a schematic diagram of the original state of Example 6.

[0030] Figure 8 This is a schematic diagram of the compressed state in Example 6.

[0031] Figure 9 This is a schematic diagram of the structure of Example 7.

[0032] In the figure: 1-Outer conductor; 11-Elastic part; 111-First deformation part; 112-Second deformation part; 113-Contact section; 114-Mounting part; 115-Auxiliary support section; 116-Transition section; 117-Surface mount welding section; 12-Support part; 121-Tightening plate; 13-Fixing part; 2-Insulator; 21-Positioning plate; 22-Positioning groove; 3-Inner conductor; 31-Telescopic head; 311-Contact end; 312-Limiting end; 32-Limiting cylinder; 321-Open end; 33-Telescopic cavity; 34-Clamping part. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and reference numerals.

[0034] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0038] Example 1:

[0039] like Figure 1-4 As shown, a low-profile inter-board radio frequency connector based on an elastic pin and spring structure includes an outer conductor 1, an inner conductor 3, and an insulator 2.

[0040] The outer conductor 1 is provided with an elastic part 11, a support part 12 and a fixing part 13, and the elastic part 11 and the fixing part 13 are connected through the support part 12.

[0041] The inner conductor 3 includes a telescopic head 31, a limiting cylinder 32, and an elastic component. The telescopic head 31 is connected to the limiting cylinder 32 through the elastic component, and the elastic component is located inside the limiting cylinder 32.

[0042] The insulator 2 is located between the outer conductor 1 and the inner conductor 3.

[0043] By providing an elastic part 11 to the outer conductor 1 and an elastic component to the inner conductor 3, the outer conductor 1 and the inner conductor 3 can be appropriately stretched and contracted to accommodate different spacings between the two PCB boards.

[0044] The fixing part 13 and the limiting cylinder 32 are both welded to one of the PCB boards, and the elastic part 11 and the telescopic head 31 abut against the other PCB board. Since the outer conductor 1 and the inner conductor 3 are stably connected to the PCB board, they can play a good conductive role.

[0045] Traditional connectors connect two connectors to two PCBs respectively, and then connect the two connectors through an adapter. However, this application provides an elastic part 11, which allows one end of the connector to be soldered to the PCB and the other end of the connector to abut against the PCB, greatly reducing the size of the original connector.

[0046] Example 2:

[0047] Based on Embodiment 1, the low-profile inter-board connector with a spring and elastic pin structure includes an outer conductor 1, an inner conductor 3, and an insulator 2. The outer conductor 1 is composed of multiple spring structures; the inner conductor 3 is an elastic pin structure, which consists of a fixed conductor (limiting cylinder 32), a sliding conductor (telescopic head 31), and an elastic component. The elastic component is located between the fixed conductor and the sliding conductor, and the outer wall of the fixed conductor has a barb-like structure that interferes with the insulator 2; the insulator 2 is used to support and mount the inner conductor 3 and the outer conductor 1. The shape of the spring varies depending on requirements such as connector position deviation.

[0048] Two elastic parts 11 are provided, and the two elastic parts 11 are symmetrically connected to both sides of the support part 12.

[0049] By providing two elastic parts 11, the PCB board can be abutted by the elastic parts 11, thus ensuring the stability of the connection with the PCB board.

[0050] The limiting cylinder 32 has an engaging part 34 on its outside and a telescopic cavity 33 inside. One end of the telescopic cavity 33 is a closed end and the other end of the telescopic cavity 33 is an open end 321. The elastic component is located on the side of the telescopic cavity 33 near the closed end, and the protruding head is located on the side of the telescopic cavity 33 near the open end 321.

[0051] By setting the telescopic cavity 33, the telescopic head 31 can slide inside the telescopic cavity 33. When the telescopic head 31 is pressed, the telescopic head 31 will deflect and come into contact with the inside of the telescopic cavity 33, thereby realizing the conductivity of the inner conductor 3.

[0052] The opening end 321 is provided with a narrowing structure, and the telescopic head 31 includes a contact end 311 and a limiting end 312. The limiting end 312 is located in the telescopic cavity 33 and abuts against the elastic component. The contact end 311 extends out from the narrowing structure.

[0053] By setting a constriction structure, the telescopic head 31 will not pop out of the telescopic cavity 33. At the same time, the elastic component can be contracted by compressing the telescopic head 31 to adapt to the change in the distance between the two PCB boards.

[0054] The elastic component is a spring.

[0055] Example 3:

[0056] Based on Embodiment 1, the inner conductor 3 is connected to the middle part of the insulator 2, and the outer conductor 1 is connected to the outside of the insulator 2.

[0057] By placing the inner conductor 3 in the middle of the insulator 2 and the outer conductor 1 on the outside of the insulator 2, contact between the inner conductor 3 and the outer conductor 1 can be effectively avoided, while also not affecting the elastic deformation of the inner conductor 3 and the outer conductor 1.

[0058] The insulator 2 is provided with a positioning plate 21 and a positioning groove 22, and the support part 12 is provided with a top clamping plate 121. The positioning plate 21 is used to engage the upper end of the support part 12, and the positioning groove 22 is used to engage the top clamping plate 121.

[0059] By setting the positioning plate 21, the outer conductor 1 can be prevented from sliding out from the upper end of the insulator 2. By setting the positioning groove 22 and the top clamping plate 121, the outer conductor 1 can be prevented from sliding out from the lower end of the insulator 2.

[0060] Two positioning plates 21 are provided, and the two positioning plates 21 are respectively located on opposite sides of the insulator 2. Two positioning grooves 22 are provided, and the two positioning grooves 22 are respectively located on opposite sides of the insulator 2.

[0061] The insulator 2 is a rectangular body, with two positioning grooves 22 and two positioning plates 21 respectively located on the four sides of the insulator 2.

[0062] Positioning plates 21 and positioning grooves 22 are respectively placed around the insulator 2, making the connection between the insulator 2 and the outer conductor 1 more secure and improving the overall integrity.

[0063] The top clamping plate 121 is a "U"-shaped structure cut out of the support part 12. During installation, the outer conductor 1 is first inserted from below the insulator 2 so that the upper end of the support part 12 presses against the positioning plate 21. Then, the top clamping plate 121 is pressed so that the lower end of the top clamping plate 121 is inserted into the positioning groove 22, thus completing the connection between the outer conductor 1 and the insulator 2.

[0064] The insulator 2 may also omit the positioning plate 21 and instead have two upward positioning grooves 22 (the other set of positioning grooves 22 downward), and then have an upward clamping plate 121 (the other set of positioning plates 21 downward) at the connection part, using the same structure of clamping plate 121 and positioning grooves 22 for positioning.

[0065] Example 4:

[0066] Based on Example 3, such as Figure 5 As shown, the spring structure (elastic part 11) is an integral structure, formed by stamping high-strength and high-elasticity copper alloy.

[0067] The reed structure includes a contact section 113, an auxiliary support section 115, a transition section 116, a surface-mount welding section 117, a deformation section, and a mounting section 114. The contact section 113 is connected to the surface-mount welding section 117 through the auxiliary support section 115 and the transition section 116. The surface-mount welding section 117 is connected to the support section 12 through the deformation section.

[0068] The contact segment 113 is in the form of line contact or point contact.

[0069] The width of the auxiliary support section gradually decreases from the transition section 116 to the contact section 113.

[0070] The transition section 116 is an arc-shaped strip structure that transitions between the surface-mount welding section 117 and the auxiliary support section 115.

[0071] The reed structure is characterized in that the width gradually decreases along the surface-mount welding section 117, the transition section 116, and the auxiliary support section 115, and when in a free state, the surface-mount welding section 117 is parallel to the welding body.

[0072] By changing the arrangement and combination of the reed structure, different requirements for inter-board connector structure, positional deviation, and signal transmission tolerance in both the horizontal and vertical directions can be met.

[0073] Example 5:

[0074] Based on Example 3, such as Figure 6 As shown, there are four elastic parts 11, and the four elastic parts 11 are centrally symmetrical about the inner conductor 3.

[0075] It enables RF interconnection when the board spacing requirement is less than 5mm, while improving the horizontal and vertical tolerance of signal transmission. Furthermore, it features a simple structure, high production efficiency, low cost, and ensures stable interconnection between boards.

[0076] The outer conductor 1 spring structure is manufactured as a single piece and then bent into shape.

[0077] Connector designs that meet different board spacing and positional deviation requirements can be achieved by changing the number of deformation parts;

[0078] Stable connection of the inter-board RF connector structure can be achieved by changing the arrangement and combination of the springs.

[0079] The elastic part 11 includes a deformable part, a contact section 113 and a connecting part. The connecting part is connected to the support part 12, and the contact section 113 is connected to the connecting part through the deformable part.

[0080] By deforming the deformable part, the elastic part 11 can adapt to PCB boards with different spacing.

[0081] The deformable portion includes a first deformable portion 111 and a second deformable portion 112 that are connected to each other. The first deformable portion 111 is a bent "S"-shaped structure, and the second deformable portion 112 is a bent "S"-shaped structure.

[0082] By providing a first deformation section 111 and a second deformation section 112, multiple deformations can be achieved when subjected to pressure, thereby improving the stress distribution of each deformation section.

[0083] Example 6:

[0084] Based on Example 5, such as Figure 7 and 8 As shown, the first deformable part 111 is an external structure, and the second deformable part 112 is an internal structure.

[0085] The external structure corresponds to the internal structure. The external structure refers to the two bent "S"-shaped structures located on the outside, while the internal structure refers to the "S"-shaped structure located in the middle. When the deformable part is compressed, the "S"-shaped structure of the second deformable part 112 will be located between the two "S"-shaped structures of the first deformable part 111, thus having a larger deformation stroke.

[0086] Example 7:

[0087] Based on Example 5, such as Figure 9 As shown, both the first deformable part 111 and the second deformable part 112 are external structures.

[0088] The external structure refers to two bent "S"-shaped structures located on the outside. When the deformable part is compressed, the "S"-shaped structure of the first deformable part 111 will press on the upper side of the "S"-shaped structure of the second deformable part 112, thereby having better stress performance.

[0089] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A low-height inter-board radio frequency connector based on an elastic pin and spring structure, characterized in that: It includes an outer conductor (1), an inner conductor (3), and an insulator (2); The outer conductor (1) is provided with an elastic part (11), a support part (12) and a fixing part (13), and the elastic part (11) and the fixing part (13) are connected by the support part (12); The inner conductor (3) includes a telescopic head (31), a limiting cylinder (32) and an elastic component. The telescopic head (31) is connected to the limiting cylinder (32) through the elastic component, and the elastic component is located inside the limiting cylinder (32). The insulator (2) is disposed between the outer conductor (1) and the inner conductor (3); The inner conductor (3) is connected to the middle part of the insulator (2), and the outer conductor (1) is connected to the outside of the insulator (2); The insulator (2) is provided with two positioning plates (21) and two positioning grooves (22). The two positioning plates (21) are located on opposite sides of the insulator (2), and the two positioning grooves (22) are located on opposite sides of the insulator (2). The insulator (2) is a rectangular body. The two positioning grooves (22) and the two positioning plates (21) are respectively provided on the four sides of the insulator (2). The support part (12) is provided with a top clamping plate (121). The positioning plate (21) is used to engage the upper end of the support part (12), and the positioning grooves (22) are used to engage the top clamping plate (121). The top clamping plate (121) is a "U" shaped structure dug out by the support part (12). The elastic part (11) is provided in four parts, and the four elastic parts (11) are centrally symmetrical about the inner conductor (3). The elastic part (11) includes a deformation part, a contact section (113) and a connecting part. The connecting part is connected to the support part (12), and the contact section (113) is connected to the connecting part through the deformation part. The deformable part includes a first deformable part (111) and a second deformable part (112) that are connected to each other. The first deformable part (111) is a bent "S"-shaped structure, and the second deformable part (112) is a bent "S"-shaped structure. The first deformable part (111) is an external structure, and the second deformable part (112) is an internal structure.

2. The low-height inter-board RF connector based on elastic pin and spring structure according to claim 1, characterized in that: The outer conductor (1) includes multiple spring structures, and the inner conductor (3) is an elastic needle structure, which consists of a fixed conductor, a sliding conductor, and an elastic component; The elastic component is located between the fixed conductor and the sliding conductor, and the outer wall of the fixed conductor is provided with a barb-like structure that is interference-fitted with the insulator (2); The insulator (2) is used to support and mount the inner conductor (3) and the outer conductor (1).

3. The low-height inter-board RF connector based on elastic pin and spring structure according to claim 1, characterized in that: The limiting cylinder (32) is provided with a telescopic cavity (33), one end of the telescopic cavity (33) is a closed end, and the other end of the telescopic cavity (33) is an open end (321). The elastic component is provided on the side of the telescopic cavity (33) near the closed end, and the telescopic head (31) is provided on the side of the telescopic cavity (33) near the open end (321). The opening end (321) is provided with a constriction structure. The telescopic head (31) includes a contact end (311) and a limiting end (312). The limiting end (312) is located in the telescopic cavity (33) and abuts against the elastic component. The contact end (311) extends out from the constriction structure.

4. The low-height inter-board RF connector based on elastic pin and spring structure according to claim 2, characterized in that: The spring structure is an integral structure, which includes a contact section (113), an auxiliary support section (115), a transition section (116), a surface-mount welding section (117), a deformation section, and a mounting section (114). The contact section (113) is connected to the surface-mount welding section (117) through the auxiliary support section (115) and the transition section (116), and the surface-mount welding section (117) is connected to the mounting section (114) through the deformation section; The contact segment (113) is in the form of line contact or point contact; The width of the auxiliary support section (115) gradually decreases from the transition section (116) to the contact section (113); The transition section (116) is an arc-shaped strip structure. The transition section (116) is used to transition between the surface-mount welding section (117) and the auxiliary support section (115).

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