A type of card connector

Abstract

This application discloses a card plate connector, relating to the field of connector technology. A first housing has a first socket for inserting a mating component and a second socket for inserting two sets of plate terminal blocks on both sides of its width direction. The first housing has a hollow cavity connecting the first and second sockets. Abutment portions are provided on both sides of the first housing in its height direction. The tails of the two sets of plate terminal blocks are connected to a terminal carrier. A pressing portion is provided on both sides of the opening at one end of the second housing. The two sets of plate terminal blocks on the terminal carrier are inserted into the hollow cavity of the first housing. The second housing is fitted over the first housing. The pressing portions on both sides of the second housing press against the abutment portions on both sides of the first housing, thereby pressing against the two sets of plate terminal blocks, firmly clamping the mating component between the two sets of plate terminal blocks. The cooperation between the pressing portions and the abutment portions improves the connection stability of the card plate connector.

Description

Technical Field

[0001] This application relates to the field of connector technology, and in particular to a cardboard connector. Background Technology

[0002] Card edge connectors are core components designed for high-speed data transmission and modular assembly between printed circuit boards, and are widely used in computer hardware, communication equipment, industrial control, and new smart terminals. Currently, card edge connectors on the market suffer from low connection stability. In vibrating environments, connectors with low connection stability are prone to loosening, leading to poor contact, and unstable connections may cause signal interruptions or fluctuations during transmission.

[0003] Therefore, how to improve the connection stability of the card connector is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a card connector that solves the problem of low connection stability in current card connectors.

[0005] To solve the above-mentioned technical problems, this application provides a cardboard connector, including: a first housing, a first plate-type terminal group, a second plate-type terminal group, a terminal carrier, and a second housing;

[0006] The first housing has a first socket for inserting a component and a second socket for inserting the first and second sheet-type terminal groups on both sides in the width direction. The interior of the first housing has a hollow cavity connecting the first and second sockets. The first housing has abutment portions on both sides in the height direction. The tails of the first and second sheet-type terminal groups are connected to the terminal carrier and are arranged opposite to each other. The second housing has pressing portions on both sides of the opening at one end. The pressing portions are used to press the abutment portions when the first housing is fitted inside the second housing, so that the abutment portions on both sides of the first housing press the first and second sheet-type terminal groups respectively.

[0007] In one optional embodiment, the first housing has through holes on both sides along its length, and the terminal carrier has connecting arms on both sides. The ends of the connecting arms have barbs. The barbs are used to engage with the slots on the hands of the first and second piece-type terminal groups through the through holes when the first piece-type terminal group and the second piece-type terminal group are inserted into the hollow cavity of the first housing.

[0008] In one optional embodiment, mounting holes are provided on both sides of the first housing in the height direction, the abutment portion is located in the mounting hole, the first side of the abutment portion near the first socket is higher than the second side of the abutment portion near the second socket to form a slope, and the second side of the abutment portion is connected to the inner wall of the mounting hole.

[0009] In one optional embodiment, the extrusion portion is a V-shaped extrusion portion, and the opening directions of the V-shaped extrusion portions on both sides of the second housing are opposite, and the inclined surface is provided with a groove that matches the bottom of the V-shaped extrusion portion.

[0010] In one optional embodiment, a positioning protrusion is provided on any outer side of the first housing in the height direction, and a positioning hole is provided on the second housing to match the positioning protrusion.

[0011] In one optional embodiment, both the first and second sheet terminal groups include multiple sheet terminals. The tail of each sheet terminal is a U-shaped plug, the middle surface of each sheet terminal is provided with a limiting protrusion, the head of each sheet terminal is a long strip-shaped contact portion, and the end of the long strip-shaped contact portion is an inclined guide end.

[0012] In one optional embodiment, the terminal carrier is provided with two sets of socket groups, each set of socket groups including multiple sockets spaced apart and cooperating with the U-shaped plug, and a connecting part is provided between two adjacent sockets for connecting wire harnesses.

[0013] In one optional embodiment, the two side walls of the hollow cavity in the height direction are provided with limiting grooves that cooperate with the limiting protrusions, and the limiting grooves are located close to the second insertion port.

[0014] In one optional embodiment, the hollow cavity has guide rail grooves on both sides in the height direction. The guide rail grooves include a plurality of guide rail grooves spaced apart along the length direction of the hollow cavity. The guide rail grooves are used to accommodate the elongated contact portion.

[0015] In one optional embodiment, interference ribs are provided on both sides of the inner wall of the guide rail groove, and the surface of the interference ribs is an arc surface.

[0016] The card plate connector provided in this application has a first socket for inserting a pair of components and a second socket for inserting a first and a second piece of terminal blocks on both sides of the width direction of the first housing. The interior of the first housing has a hollow cavity connecting the first and second sockets. The height direction of the first housing has abutment portions on both sides. The tails of the first and second piece of terminal blocks are connected to a terminal carrier and are arranged opposite to each other. One end of the second housing has a pressing portion on both sides of its opening. The first and second piece of terminal blocks on the terminal carrier are inserted into the hollow cavity of the first housing, and the second housing is fitted over the first housing. The pressing portions on both sides of the second housing press the abutment portions on both sides of the first housing, thereby pressing the first and second piece of terminal blocks, so that the pair of components is firmly clamped between the first and second piece of terminal blocks. The cooperation between the pressing portions and the abutment portions improves the connection stability of the card plate connector and enhances its vibration resistance. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a cardboard connector provided in an embodiment of this application;

[0019] Figure 2 An assembly drawing of a cardboard connector provided in an embodiment of this application;

[0020] Figure 3 This is an assembly diagram of a cardboard connector and its counterpart provided in an embodiment of this application;

[0021] Figure 4 A cross-sectional view of a card connector mating with a device provided in an embodiment of this application;

[0022] Figure 5 A cross-sectional view of a cardboard connector provided in an embodiment of this application;

[0023] Figure 6 A structural diagram of a chip terminal provided in an embodiment of this application;

[0024] Figure 7 A cross-sectional view of a first housing and a terminal carrier provided in an embodiment of this application;

[0025] Figure 8 Provided for the embodiments of this application Figure 7 Enlarged view of A in the middle;

[0026] Figure 9 A first cross-sectional view of the first outer casing provided in an embodiment of this application;

[0027] Figure 10 Provided for the embodiments of this application Figure 9 Enlarged view of B in the middle;

[0028] Figure 11 A second cross-sectional view of the first housing provided in an embodiment of this application;

[0029] Figure 12 Provided for the embodiments of this application Figure 11 A magnified view of C.

[0030] The reference numerals in the attached drawings are as follows: 1-First housing, 2-First plate terminal group, 3-Second plate terminal group, 4-Terminal carrier, 5-Second housing, 6-Wire harness, 7-Plate terminal, 8-Pair, 101-Abutting part, 1011-Groove, 102-Through hole, 103-Positioning protrusion, 104-Guide groove, 105-Interference rib, 401-Connecting arm, 402-Barb part, 403-Socket, 404-Connecting part, 501-Extrusion part, 502-Positioning hole, 701-U-shaped plug, 7011-Protrusion part, 702-Limiting protrusion, 703-Elongated contact part, 7031-Inclined guide end. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0032] The core of this application is to provide a cardboard connector for improving the connection stability of cardboard connectors.

[0033] It should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a schematic diagram of a cardboard connector provided in an embodiment of this application. Figure 2 This is an assembly drawing of a cardboard connector provided in an embodiment of this application. Figure 3 This application provides an embodiment of an assembly diagram of a cardboard connector and its counterpart, as shown below. Figure 1 and Figure 3 As shown, the card connector includes: a first housing 1, a first piece-type terminal group 2, a second piece-type terminal group 3, a terminal carrier 4, and a second housing 5; the first housing 1 has a first socket for inserting a pair of components 8 and a second socket for inserting the first piece-type terminal group 2 and the second piece-type terminal group 3 on both sides in the width direction; the first housing 1 has a hollow cavity inside that connects the first socket and the second socket; the first housing 1 has abutment portions 101 on both sides in the height direction; the tail of the first piece-type terminal group 2 and the tail of the second piece-type terminal group 3 are both connected to the terminal carrier 4, and the first piece-type terminal group 2 and the second piece-type terminal group 3 are arranged opposite to each other; the second housing 5 has a pressing portion 501 on both sides of the opening at one end; the pressing portion 501 is used to press the abutment portion 101 when the first housing 1 is fitted inside the second housing 5, so that the abutment portions 101 on both sides of the first housing 1 press the first piece-type terminal group 2 and the second piece-type terminal group 3 respectively.

[0036] like Figure 1 As shown, the hollow cavity within the first housing 1 is used to accommodate the first sheet terminal group 2, the second sheet terminal group 3, and the mating member 8 sandwiched between the first sheet terminal group 2 and the second sheet terminal group 3. The mating member 8 can be a printed circuit board (PCB). The first socket serves as the insertion port for the mating member 8, and the second socket serves as the insertion port for the first sheet terminal group 2 and the second sheet terminal group 3. Both the first sheet terminal group 2 and the second sheet terminal group 3 include multiple sheet terminals 7. The specific structure of the sheet terminals 7 is not limited in this embodiment. The tail of the sheet terminal 7 is connected to the terminal carrier 4, and the head of the sheet terminal 7 contacts the functional area of ​​the PCB. The first outer shell 1 has abutment portions 101 on both sides in the height direction. The second outer shell 5 has an open structure at both ends. The two sides of the opening of the second outer shell 5 have extrusion portions 501. When the first piece-type terminal group 2 and the second piece-type terminal group 3 on the terminal carrier 4 are inserted into the hollow cavity of the first outer shell 1, the second outer shell 5 is sleeved on the outside of the first outer shell 1. The upper extrusion portion 501 extrudes the upper abutment portion 101, and the lower extrusion portion 501 extrudes the lower abutment portion 101. Then, the abutment portions 101 on both sides of the first outer shell 1 extrudes the outer side of the first piece-type terminal group 2 and the outer side of the second piece-type terminal group 3 respectively, so that the hand piece 8 is firmly clamped between the first piece-type terminal group 2 and the second piece-type terminal group 3.

[0037] The card connector provided in this application embodiment has a first socket for inserting a male component 8 and a second socket for inserting a first plate-type terminal group 2 and a second plate-type terminal group 3 on both sides of the width direction of the first housing 1. The interior of the first housing 1 has a hollow cavity connecting the first socket and the second socket. The two sides of the first housing 1 in the height direction have abutment portions 101. The tails of the first plate-type terminal group 2 and the tails of the second plate-type terminal group 3 are both connected to the terminal carrier 4, and the first plate-type terminal group 2 and the second plate-type terminal group 3 are arranged opposite to each other. The two sides of the opening at one end of the second housing 5 have pressing portions. 501; The first piece-type terminal group 2 and the second piece-type terminal group 3 on the terminal carrier 4 are inserted into the hollow cavity of the first housing 1. The second housing 5 is sleeved on the outside of the first housing 1. The pressing parts 501 on both sides of the second housing 5 press the abutting parts 101 on both sides of the first housing 1 respectively. In turn, the abutting parts 101 on both sides of the first housing 1 press the first piece-type terminal group 2 and the second piece-type terminal group 3 respectively, so that the hand piece 8 is firmly clamped between the first piece-type terminal group 2 and the second piece-type terminal group 3. The cooperation between the pressing part 501 and the abutting part 101 improves the connection stability of the card connector and enhances the vibration resistance.

[0038] Based on the above embodiments, Figure 4 A cross-sectional view of a card connector mating with a matching component is provided in an embodiment of this application, as shown below. Figure 1 and Figure 4 As shown, in this embodiment of the application, the first outer shell 1 has through holes 102 on both sides in the length direction, and the terminal carrier 4 has connecting arms 401 on both sides. The ends of the connecting arms 401 are provided with barbs 402. The barbs 402 are used to engage with the slots on the hands 8 between the first and second piece-type terminal groups 2 and 3 through the through holes 102 when the first piece-type terminal group 2 and the second piece-type terminal group 3 are inserted into the hollow cavity of the first outer shell 1.

[0039] In this embodiment, the terminal carrier 4 has connecting arms 401 on both sides, and the barbs 402 at the ends of the connecting arms 401 are arranged opposite to each other. Through holes 102 are provided on both sides of the first housing along its length. When the first sheet terminal group 2 and the second sheet terminal group 3 on the terminal carrier 4 are inserted into the first housing 1, the connecting arms 401 on both sides of the terminal carrier 4 are inserted into the sliding grooves on both sides of the first housing along its length. Figure 4 As shown, the barb portion 402 passes through the through hole 102 and is inserted into the slot on the counter 8 between the first plate terminal group 2 and the second plate terminal group 3, thereby further ensuring the stability of the connection between the card plate connector and the counter 8.

[0040] Based on the above embodiments, Figure 5 A cross-sectional view of a cardboard connector provided in an embodiment of this application is shown below. Figure 1 and Figure 5As shown, mounting holes are provided on both sides of the first outer casing 1 in the height direction. The abutment part 101 is located in the mounting hole. The first side of the abutment part 101 near the first socket is higher than the second side of the abutment part 101 near the second socket to form a slope. The second side of the abutment part 101 is connected to the inner wall of the mounting hole.

[0041] In this embodiment, the second side of the abutment portion 101 is connected to the inner wall of the mounting hole. The first side of the abutment portion 101 near the first socket is higher than the second side of the abutment portion 101 near the second socket to form a slope. Based on this, when the pressing portion 501 presses the abutment portion 101, the first side of the abutment portion 101 presses the outer surface of the sheet terminal group, thereby applying a force toward its tail to the sheet terminal group, and also ensuring that the pair 8 inserted between the first sheet terminal group 2 and the second sheet terminal group 3 is not easy to fall off in a vibrating environment.

[0042] Based on the above embodiments, the extrusion part 501 of this application embodiment is a V-shaped extrusion part, and the opening directions of the V-shaped extrusion parts on both sides of the second outer shell 5 are opposite. The inclined surface of the abutment part 101 is provided with a groove 1011 that matches the bottom of the V-shaped extrusion part.

[0043] In this embodiment of the application, the number of V-shaped extrusion portions provided on each side of the second outer shell 5 is not specifically limited, such as... Figure 1 As shown, the second outer shell 5 has two V-shaped extrusion portions on both its upper and lower edges. The inclined surface of the abutment portion 101 has a groove 1011 that matches the bottom of the V-shaped extrusion portion to ensure precise assembly and positioning.

[0044] Based on the above embodiments, in this application embodiment, a positioning protrusion 103 is provided on any outer side of the first outer shell 1 in the height direction, and a positioning hole 502 matching the positioning protrusion 103 is provided on the second outer shell 5. In this application embodiment, the positioning protrusion 103 is located near the second insertion port. When the first shell is fitted inside the second shell, the positioning protrusion 103 on the outer side of the first outer shell 1 is inserted into the positioning hole 502 on the second outer shell 5, thereby determining the relative position of the first outer shell 1 and the second outer shell 5 during the assembly process, so that the pressing part 501 on the second outer shell 5 can be smoothly inserted into the groove 1011 of the abutment part 101, so that the abutment part 101 effectively abuts against the outer surface of the chip terminal group.

[0045] Based on the above embodiments, Figure 6 A structural diagram of a chip terminal provided in an embodiment of this application is shown below. Figure 6As shown, in the embodiments of this application, the first plate terminal group 2 and the second plate terminal group 3 both include multiple plate terminals 7. The tail of the plate terminal 7 is a U-shaped plug 701, the middle surface of the plate terminal 7 is provided with a limiting protrusion 702, the head of the plate terminal 7 is a strip-shaped contact portion 703, and the end of the strip-shaped contact portion 703 is an inclined guide end 7031.

[0046] In this embodiment, the number of chip terminals 7 in each chip terminal group is not specifically limited. Multiple chip terminals 7 realize multi-point contact design with the counterpart 8, thereby significantly improving the reliability of the connection and reducing the risk of the entire connection failing due to single-point contact failure.

[0047] In this embodiment, the tail of the sheet terminal 7 is a U-shaped plug 701, and correspondingly, as shown... Figure 1 As shown, the terminal carrier 4 has two sets of socket groups. Each set of socket groups includes multiple sockets 403 spaced apart and cooperating with the U-shaped plug 701. A connecting part 404 is provided between two adjacent sockets 403 for connecting the wire harness 6. The sockets 403 in the first set of socket groups correspond one-to-one with the sockets 403 in the second set of socket groups. Figure 7 A cross-sectional view of a first housing and terminal carrier provided in an embodiment of this application. Figure 8 Provided for the embodiments of this application Figure 7 Enlarged view of A in the diagram, as shown Figure 7 and Figure 8 As shown, the U-shaped plug 701 has protrusions 7011 on both sides of its end, and the two side walls of the socket 403 have recessed grooves that mate with the protrusions 7011. When the U-shaped plug 701 is inserted into the socket 403, the protrusions 7011 of the U-shaped plug 701 fall into the recessed grooves, indicating that the U-shaped plug 701 is properly inserted into the terminal carrier 4.

[0048] In this embodiment, the surface of the chip terminal 7 has a limiting protrusion 702 in the middle. Correspondingly, the two side walls of the hollow cavity in the height direction have limiting grooves that cooperate with the limiting protrusion 702, and the limiting grooves are located close to the second socket. Through the cooperation of the limiting grooves and the limiting protrusion 702, displacement of the chip terminal 7 within the first housing 1 can be prevented, thereby enhancing the structural stability of the entire connector.

[0049] In this embodiment, the head of the chip terminal 7 is an elongated contact portion 703, which contacts the PCB functional area. The end of the elongated contact portion 703 is an inclined guide end 7031. The remaining part of the elongated contact portion 703, excluding the inclined guide end 7031, is the main body. The angle between the main body and the inclined guide end 7031 is an obtuse angle. The bending directions of the inclined guide end 7031 of the chip terminal 7 in the first chip terminal group 2 and the inclined guide end 7031 of the chip terminal 7 in the second chip terminal group 3 are opposite. The design of the inclined guide end 7031 reduces the risk of scratching and damage during the insertion process when the component 8 is inserted between the first chip terminal group 2 and the second chip terminal group 3. Accordingly, Figure 9 A first cross-sectional view of the first outer casing provided in an embodiment of this application. Figure 10 Provided for the embodiments of this application Figure 9 Enlarged view of B in the image, as shown Figure 9 and Figure 10 As shown, the hollow cavity has guide rail grooves on both sides along its height direction. The guide rail grooves include multiple guide rail grooves 104 spaced apart along the length direction of the hollow cavity. The guide rail grooves 104 are used to accommodate the elongated contact portion 703. The guide rail groove 104 is an elongated groove that provides precise guidance for the elongated contact portion 703. Figure 11 A second cross-sectional view of the first outer casing provided in an embodiment of this application. Figure 12 Provided for the embodiments of this application Figure 11 Enlarged view of C, such as Figure 11 and Figure 12 As shown, interference ribs 105 are provided on both sides of the inner wall of the guide groove 104, and the surface of the interference ribs 105 is an arc surface. The interference ribs 105 and the elongated contact portion 703 of the chip terminal 7 interfere with each other, thereby enhancing the fixing force of the chip terminal 7 in the guide groove 104. The arc surface interference ribs 105 can reduce the friction of the chip terminal 7 when it is inserted into and pulled out of the guide groove 104, reduce wear, and improve the durability of the connector.

[0050] The foregoing has provided a detailed description of a card connector provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0051] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A cardboard connector, characterized in that, include: First outer shell (1), first plate terminal group (2), second plate terminal group (3), terminal carrier (4), and second outer shell (5); The first outer shell (1) has a first socket for inserting a pair of parts (8) and a second socket for inserting the first plate terminal group (2) and the second plate terminal group (3) on both sides in the width direction. The first outer shell (1) has a hollow cavity inside that connects the first socket and the second socket. The first outer shell (1) has abutting parts (101) on both sides in the height direction. The tail of the first plate terminal group (2) and the tail of the second plate terminal group (3) are connected to the terminal carrier (4). The first plate terminal group (2) and the second plate terminal group (3) are arranged opposite to each other. The second outer shell (5) has a pressing part (501) on both sides of the opening at one end. The pressing part (501) is used to press the abutting part (101) when the first outer shell (1) is fitted inside the second outer shell (5), so that the abutting parts (101) on both sides of the first outer shell (1) press the first plate terminal group (2) and the second plate terminal group (3) respectively.

2. The card connector according to claim 1, wherein The first outer shell (1) has through holes (102) on both sides along its length. The terminal carrier (4) has connecting arms (401) on both sides. The end of the connecting arm (401) has a barb (402). The barb (402) is used to engage with the slot on the handpiece (8) between the first plate terminal group (2) and the second plate terminal group (3) through the through holes (102) when the first plate terminal group (2) and the second plate terminal group (3) are inserted into the hollow cavity of the first outer shell (1).

3. The card connector according to claim 1, wherein The first outer shell (1) has mounting holes on both sides in the height direction. The abutment (101) is located in the mounting hole. The first side of the abutment (101) near the first socket is higher than the second side of the abutment (101) near the second socket to form a slope. The second side of the abutment (101) is connected to the inner wall of the mounting hole.

4. The card connector according to claim 3, wherein The extrusion part (501) is a V-shaped extrusion part, and the opening directions of the V-shaped extrusion part on both sides of the second outer shell (5) are opposite. The inclined surface is provided with a groove (1011) that matches the bottom of the V-shaped extrusion part.

5. The card connector according to claim 3, characterized in that, The first outer shell (1) has a positioning protrusion (103) on any outer side in the height direction, and the second outer shell (5) has a positioning hole (502) that matches the positioning protrusion (103).

6. The card connector according to any one of claims 1 to 5, wherein The first and second piece-type terminal groups (2) each include multiple piece-type terminals (7). The tail of the piece-type terminal (7) is a U-shaped plug (701), the middle surface of the piece-type terminal (7) is provided with a limiting protrusion (702), the head of the piece-type terminal (7) is a strip-shaped contact part (703), and the end of the strip-shaped contact part (703) is an inclined guide end (7031).

7. The card connector according to claim 6, wherein The terminal carrier (4) is provided with two sets of sockets. Each set of sockets includes multiple sockets (403) spaced apart and cooperating with the U-shaped plug (701). A connecting part (404) is provided between two adjacent sockets (403). The connecting part (404) is used to connect the wire harness (6).

8. The card connector according to claim 6, wherein The hollow cavity has two side walls in the height direction with limiting grooves that cooperate with the limiting protrusion (702), and the limiting grooves are located close to the second insertion port.

9. The card connector according to claim 6, wherein The hollow cavity has guide rail grooves on both sides in the height direction. The guide rail grooves include a plurality of guide rail grooves (104) spaced apart along the length direction of the hollow cavity. The guide rail grooves (104) are used to accommodate the elongated contact portion (703).

10. The card connector according to claim 9, wherein The inner wall of the guide groove (104) is provided with interference ribs (105) on both sides, and the surface of the interference ribs (105) is an arc surface.

Images