High-speed high-density plug-in card connector

Abstract

The utility model provides a high-speed high-density plug-in card connector, which comprises an insulating body, and a plurality of terminal grooves are respectively arranged in longitudinal side walls on two sides of a slot of the insulating body; double-layer terminals are arranged in at least one part of the terminal grooves, and single-layer terminals are arranged in the rest of the terminal grooves; the double-layer terminal comprises a lower-layer terminal and an upper-layer terminal, the upper-layer terminal of the double-layer terminal is inserted and fixed in the terminal groove from the side far away from the slot to the side close to the slot in the width direction of the insulating body, and the lower-layer terminal of the double-layer terminal is inserted and fixed in the terminal groove upwards from the bottom of the insulating body; the single-layer terminals are inserted and fixed in the terminal grooves upwards from the bottom of the insulation body or inserted and fixed in the terminal grooves from the side away from the slot to the side close to the slot in the width direction of the insulation body. According to the high-speed and high-density card connector, the space structure size of the terminal groove for fixing the upper-layer terminal can be reduced, so that the strength of the insulating body can be ensured, and the width of the insulating body can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of connector, concretely relates to a high speed high density card connector. BACKGROUND

[0002] Chinese patent CN202411745993.5 discloses a kind of high-speed communication storage electric connector, including one insulating body, multiple terminals housed in insulating body.

[0003] The top surface middle part of insulating body is formed into a longitudinal slot by being concave along lengthwise direction, and the two sides of the slot have longitudinal side walls arranged along the length direction of the slot, and the longitudinal side walls on both sides of the slot are provided with multiple terminal slots.A rectangular recess with inner side opening is formed by being concave downward at the terminal slot of the top surface of the longitudinal side wall corresponding to the housing of the upper layer terminal, multiple independent fences are located below the rectangular recess, and the outer side of the multiple independent fences is connected to the side wall outside the insulating body of the rectangular recess.

[0004] Multiple terminals are respectively and one-to-one housed in the corresponding terminal slot in the two longitudinal side walls.The terminals in each longitudinal side wall have partially arranged double-layer terminals, i.e., at least a part of the terminal slots are provided with double-layer terminals, and the remaining terminal slots are single-layer terminals.Double-layer terminals include lower layer terminals and upper layer terminals, the upper layer terminals of double-layer terminals are inserted and fixed in the terminal slot from the top of the insulating body downward, the lower layer terminals of double-layer terminals are inserted and fixed in the terminal slot from the bottom of the insulating body upward, and the single-layer terminals are inserted and fixed in the terminal slot from the bottom of the insulating body upward, and each single-layer terminal is flush with the lower layer terminals and forms a row.

[0005] The above-mentioned high-speed communication storage electric connector increases the number of terminals by partially arranging double-layer terminals based on the same structure space, thus increasing the signal transmission channel and greatly improving the signal transmission speed;The upper layer terminals of double-layer terminals are inserted and fixed in the terminal slot from top to bottom, and the lower layer terminals are inserted and fixed in the terminal slot from bottom to top, without using a plug, without plug assembly steps, which not only realizes high-speed automatic terminal insertion production, but also reduces cost and improves yield.However, the structure of the rectangular recess with inner side opening concave downward on the top surface of the longitudinal side wall and the way of inserting and fixing the upper layer terminals of double-layer terminals in the terminal slot from top to bottom makes the space structure occupied by the upper layer terminals large, that is, the space structure of the terminal slot for fixing the upper layer terminals needs to be designed larger to complete the insertion and fixation of the upper layer terminals from top to bottom, thereby weakening the strength of the insulating body and increasing the width of the insulating body.Therefore, it needs to be improved. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a high speed high density card connector to solve the problems raised in the above background.

[0007] To achieve the above object, the technical scheme used by the utility model is:

[0008] A high-speed high-density card connector, comprising:

[0009] An insulating body has a longitudinal slot for inserting an electronic module, the longitudinal side walls on both sides of the slot are provided with a plurality of terminal grooves respectively, and the insulating body is provided with an ear buckle accommodating space and a pivot connection part for pivotally connecting an ear buckle at least at one end;

[0010] At least one ear buckle is pivotally connected to one end of the insulating body.

[0011] A plurality of terminals are respectively and correspondingly accommodated in the corresponding terminal grooves in the two longitudinal side walls, at least a part of the terminal grooves are provided with double-layer terminals, and the remaining terminal grooves are provided with single-layer terminals; the double-layer terminals comprise lower-layer terminals and upper-layer terminals, the upper-layer terminals of the double-layer terminals are inserted and fixed in the terminal grooves from the side away from the slot to the side close to the slot in the width direction of the insulating body, and the lower-layer terminals of the double-layer terminals are inserted and fixed in the terminal grooves upward from the bottom of the insulating body; the single-layer terminals are inserted and fixed in the terminal grooves upward from the bottom of the insulating body or inserted and fixed in the terminal grooves from the side away from the slot to the side close to the slot in the width direction of the insulating body.

[0012] Further, when each single-layer terminal is inserted and fixed in the terminal groove upward from the bottom of the insulating body, each single-layer terminal is flush with the lower-layer terminal and forms a row; when each single-layer terminal is inserted and fixed in the terminal groove from the side away from the slot to the side close to the slot in the width direction of the insulating body, each single-layer terminal is flush with the upper-layer terminal and forms a row.

[0013] Further, when each single-layer terminal is flush with the lower-layer terminal, the terminal groove accommodating each single-layer terminal penetrates the slot-facing surface of the longitudinal side wall and the bottom surface of the insulating body at the position of the single-layer terminal, and the top end of the terminal groove accommodating each single-layer terminal is a closed end; at the position of the double-layer terminal, the terminal groove accommodating each lower-layer terminal penetrates the slot-facing surface of the longitudinal side wall and the bottom surface of the insulating body, the terminal groove accommodating each upper-layer terminal penetrates the slot-facing surface and the slot-avoiding surface in the width direction of the longitudinal side wall, and the top end of the terminal groove accommodating each lower-layer terminal and the top end of the terminal groove accommodating each upper-layer terminal are both closed ends.

[0014] Further, the top surface of each longitudinal side wall is provided with a material removal groove at the position corresponding to each single-layer terminal, the inner side of the material removal groove is a retaining wall located above the terminal groove accommodating the single-layer terminal, the upper end of the retaining wall is flush with the top surface of the longitudinal side wall, and the inner side of the groove bottom of the material removal groove is in communication with the outer side of the groove top of the terminal groove accommodating the single-layer terminal through a gap groove.

[0015] Further, the terminal slot accommodating the lower layer terminal and the terminal slot accommodating the upper layer terminal are separated by a partition wall at the position of the double layer terminal, the partition wall comprises a horizontal wall above the terminal slot accommodating the single layer terminal and a vertical wall outside the terminal slot accommodating the single layer terminal, the upper end of the vertical wall is connected with the lower end of one side of the horizontal wall, the upper end of the horizontal wall and the top surface of the longitudinal side wall are provided with a second clearance groove, the second clearance groove is communicated with the insertion slot, the outside of the vertical wall is a through groove penetrating through the longitudinal side wall away from the surface of the insertion slot and the bottom surface of the longitudinal side wall, the through groove and the second clearance groove constitute the terminal slot accommodating the upper layer terminal.

[0016] Further, the surface of the longitudinal side wall away from the insertion slot is recessed to form a groove at the position close to the bottom surface of the longitudinal side wall, the groove is arranged along the longitudinal direction of the longitudinal side wall, and the groove is communicated with the through groove.

[0017] Further, the outside of the vertical wall is recessed to form at least one embedding groove, and the insertion slot side of the upper layer terminal is clamped and fixed in the embedding groove.

[0018] Further, the contact part of the upper layer terminal is higher than the contact part of the lower layer terminal, the welding part of the upper layer terminal is flush with the welding part of the lower layer terminal, the welding part of the upper layer terminal and the welding part of the lower layer terminal are oriented in the same direction, and the welding part of the single layer terminal and the welding part of the lower layer terminal are oriented in the same direction.

[0019] Further, the lower layer terminal comprises a fixed part fixed in the corresponding terminal slot, the fixed part extends upward and downward to form an upper arm part and a lower arm part, respectively, the lower end of the lower arm part is bent outward of the insulating body to form the welding part of the lower layer terminal, and the upper end of the upper arm part protrudes to form the contact part of the lower layer terminal.

[0020] Further, the upper layer terminal comprises a holding part, the holding part extends upward and downward to form an upper arm part and a lower arm part, respectively, the lower end of the lower arm part is bent outward of the insulating body to form the welding part of the upper layer terminal, the upper end of the lower arm part is transversely bent to form a bending part, the inner end of the bending part is bent upward to form an elastic force arm, the upper end of the elastic force arm is bent downward to form the contact part of the upper layer terminal located in the second clearance groove and extending into the insertion slot, the holding part protrudes to form at least one holding arm on the insertion slot side, and each holding arm is embedded and fixed in the embedding groove.

[0021] The beneficial effects of the present application mainly include that the upper layer terminal of the double layer terminal is inserted and fixed in the terminal slot from the insertion slot side away from the width direction of the insulating body, which can reduce the space structure size of the terminal slot fixing the upper layer terminal, thereby ensuring the strength of the insulating body and reducing the width of the insulating body. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1The utility model discloses a high-speed high-density card connector and electronic module and circuit board's three-dimensional exploded view;

[0023] Figure 2 It is high-speed high-density card connector's perspective drawing;

[0024] Figure 3 It is high-speed high-density card connector another angle's perspective drawing;

[0025] Figure 4 It is insulating body's perspective drawing;

[0026] Figure 5 It is insulating body's another angle's perspective drawing;

[0027] Figure 6 It is Figure 1 In the terminal's perspective drawing in among;

[0028] Figure 7 It is Figure 6 In the lower layer terminal's perspective drawing in among;

[0029] Figure 8 It is Figure 6 In the upper layer terminal's perspective drawing in among;

[0030] Figure 9 It is insulating body's receiving single layer terminal's terminal slot position's section view;

[0031] Figure 10 It is Figure 9 With single layer terminal's combination's section view;

[0032] Figure 11 It is insulating body's receiving double layer terminal's terminal slot position's section view;

[0033] Figure 12 It is Figure 11 With double layer terminal's combination's section view.

[0034] Explanation of drawing reference: insulating body 1, slot 11, lengthwise side wall 12, tower part 13, terminal slot 14, foolproof part 15, material removal groove 16, retaining wall 17, give way slot one 18, partition wall 19, horizontal wall 191, vertical wall 192, give way slot two 1a, through groove 1b, recess 1c, embedding groove 1d, terminal 2, fixed part 21, aperture 211, clamping point 212, upper arm part one 22, lower arm part one 23, welding part 24, contact part 25, holding part 26, holding arm 261, upper arm part two 27, lower arm part two 28, bending part 29, elastic force arm 2a, ear buckle 4, metal lock structure 5, electronic module 6, iron foot 7, circuit board 8. DETAILED DESCRIPTION

[0035] In order to better understand the purposes, structures, features and effects of the present application, the present application will be further described in conjunction with the drawings and specific embodiments.

[0036] As shown in Figures 1-12 The high-speed high-density card connector comprises an insulating body 1 and a plurality of terminals 2 accommodated in the insulating body 1.

[0037] The top middle part of the insulating body 1 is longitudinally concave to form a longitudinal slot 11, both ends of the length direction of the insulating body 1 are provided with a tower part 13, both ends of the slot 11 extend into the tower part 13, and the tower part 13 at both ends of the length direction of the insulating body 1 is different in height. The tower part 13 with lower height has an ear buckle accommodating space, the tower part 13 has a pivot part for pivoting the ear buckle and is provided with an ear buckle 4, the tower part 13 with higher height is provided with a metal lock structure 5, and the ear buckle 4 and the metal lock structure 5 constitute a single-side ear buckle mode, which can save the space occupied by the opening of the ear buckle. The ear buckle 4 and the metal lock structure 5 are buckled and fixed on both sides of an electronic module 6 inserted into the slot 11 to fix the electronic module 6. The bottom of each tower part 13 of the insulating body 1 is fixed with an iron foot 7 for connecting with a circuit board 8 to fix the insulating body 1 to the circuit board 8.

[0038] The slot 11 has longitudinal side walls 12 arranged along the length direction of the slot 11 on both sides, and each longitudinal side wall 12 is provided with a plurality of terminal grooves 14. The terminal grooves 14 penetrate the bottom surface of the insulating body 1, and the terminal grooves 14 also penetrate the slot surface of the longitudinal side wall 12, and each terminal groove 14 does not penetrate the top surface of the longitudinal side wall 12. The plurality of terminals 2 are respectively accommodated in the corresponding terminal grooves 14 in the two longitudinal side walls 12. Among the terminals 2 in each longitudinal side wall 12, at least a part of the terminals 2 are double-layer terminals, that is, at least a part of the terminal grooves 14 are provided with double-layer terminals (one or both longitudinal side walls 12 can be provided with double-layer terminals in one terminal groove 14, or one or both longitudinal side walls 12 can be provided with double-layer terminals in multiple spaced terminal grooves 14), and the remaining terminal grooves 14 are single-layer terminals.

[0039] The slot 11 is provided with a foolproof part 15 connecting the two longitudinal side walls 12, the foolproof part 15 divides the slot 11 into a slot one and a slot two shorter than the slot one, the foolproof part 15 is close to the tower part 13 with lower height, and the foolproof part 15 is used to prevent the electronic module 6 from being inserted reversely.

[0040] The double-layer terminal comprises a lower terminal and an upper terminal, the upper terminal of the double-layer terminal is fixed in the terminal slot 14 from the far away from the slot side of the insulation body 1 to the slot side, the lower terminal of the double-layer terminal is fixed in the terminal slot 14 from the bottom of the insulation body 1 to the top, the single-layer terminal is fixed in the terminal slot 14 from the bottom of the insulation body 1 to the top, and the single-layer terminal is flush with the lower terminal and forms a row. The single-layer terminal is the same as the lower terminal, and the upper terminal is different from the single-layer terminal.

[0041] In the position of the single-layer terminal, the terminal slot 14 for accommodating the single-layer terminal penetrates the slot face of the longitudinal side wall 12 and the bottom face of the insulation body 1, and the top end of the terminal slot 14 for accommodating the single-layer terminal is a closed end; in the position of the double-layer terminal, the terminal slot 14 for accommodating the lower terminal penetrates the slot face of the longitudinal side wall 12 and the bottom face of the insulation body 1, the terminal slot 14 for accommodating the upper terminal penetrates the slot face and the far away from the slot face of the longitudinal side wall 12 in the width direction, and the top end of the terminal slot 14 for accommodating the lower terminal and the top end of the terminal slot 14 for accommodating the upper terminal are both closed ends.

[0042] The top face of each longitudinal side wall 12 is provided with a material removal groove 16 in the position corresponding to the single-layer terminal, the material removal groove 16 not only saves materials, but also reduces the weight of the insulation body 1, prevents the insulation body 1 from warping, and facilitates mold forming. The inner side of the material removal groove 16 is a retaining wall 17 located above the terminal slot 14 for accommodating the single-layer terminal, the upper end of the retaining wall 17 is flush with the top face of the longitudinal side wall 12, and the inner side of the groove bottom of the material removal groove 16 is communicated with the outer side of the groove top of the terminal slot 14 for accommodating the single-layer terminal through a gap slot one 18.

[0043] In the position of the double-layer terminal, the terminal slot 14 for accommodating the lower terminal and the terminal slot 14 for accommodating the upper terminal are separated by a partition wall 19, the partition wall 19 comprises a horizontal wall 191 located above the terminal slot 14 for accommodating the single-layer terminal and a vertical wall 192 located outside the terminal slot 14 for accommodating the single-layer terminal, the upper end of the vertical wall 192 is connected with one side of the lower end of the horizontal wall 191, there is a gap slot two 1a between the upper end of the horizontal wall 191 and the top face of the longitudinal side wall 12, the gap slot two 1a is communicated with the slot 11, the outer side of the vertical wall 192 is a through groove 1b penetrating the far away from the slot face of the longitudinal side wall 12 and the bottom face of the longitudinal side wall 12, and the through groove 1b and the gap slot two 1a form the terminal slot 14 for accommodating the upper terminal. The outer side of the vertical wall 192 is recessed to form at least one embedding groove 1d, and the slot side of the upper terminal is clamped and fixed in the embedding groove 1d.

[0044] The far away from the slot face of each longitudinal side wall 12 is recessed to form a groove 1c in the position close to the bottom face of the longitudinal side wall 12, the groove 1c is arranged along the longitudinal direction of the longitudinal side wall 12, and the groove 1c is communicated with the through groove 1b.

[0045] The lower layer terminal comprises a fixed part 21 fixed in the corresponding terminal groove 14, the fixed part 21 is provided with an opening 211, the inner side of the fixed part 21 is protruded to form a clamping point 212, the fixed part 21 extends upward and downward to form an upper arm part 22 and a lower arm part 23 respectively, the lower end of the lower arm part 23 is bent outward to the outer side of the insulating body 1 to form a welding part 24 of the lower layer terminal, the welding part 24 of the single layer terminal and the welding part 24 of the lower layer terminal are in the same direction, and the upper end of the upper arm part 22 is protruded to the side of the insertion slot 11 to form a contact part 25 of the lower layer terminal.

[0046] The upper layer terminal comprises a holding part 26, the holding part 26 extends upward and downward to form an upper arm part 27 and a lower arm part 28 respectively, the lower end of the lower arm part 28 is bent outward to the outer side of the insulating body 1 to form a welding part 24 of the upper layer terminal, the upper end of the lower arm part 28 is transversely bent to the side of the insertion slot 11 to form a bending part 29, the inner end of the bending part 29 is bent upward to form an elastic force arm 2a, the upper end of the elastic force arm 2a is bent downward to form a contact part 25 of the upper layer terminal located in the accommodation groove 2a and extending into the insertion slot 11, and the side of the insertion slot of the holding part 26 is protruded to form at least one holding arm 261, and each holding arm 261 is embedded and fixed in one of the embedding grooves 1d.

[0047] The contact part 25 of the upper layer terminal is higher than the contact part 25 of the lower layer terminal, the welding part 24 of the upper layer terminal is flush with the welding part 24 of the lower layer terminal, the welding part 24 of the upper layer terminal and the welding part 24 of the lower layer terminal are in the same direction (both are outwardly arranged), and the welding part 24 of the single layer terminal and the welding part 24 of the lower layer terminal are in the same direction (both are outwardly arranged).

[0048] The beneficial effects of the utility model mainly reflect in: the upper layer terminal of the double layer terminal is inserted and fixed in the terminal groove 14 from the side away from the insertion slot to the side close to the insertion slot in the width direction of the insulating body 1, which can reduce the space structure size of the terminal groove 14 for fixing the upper layer terminal, thereby ensuring the strength of the insulating body and reducing the width of the insulating body.

[0049] In other embodiments, two ear buckles 4 are arranged on the two tower parts 13 of the insulating body 1 respectively. The two ear buckles 4 are buckled and fixed on the two sides of the electronic module 6 inserted into the insertion slot 11 to fix the electronic module 6.

[0050] In other embodiments, each single layer terminal is flush with the upper layer terminal and constitutes a row. Each single layer terminal has the same structure as the upper layer terminal, each single layer terminal has a different structure from the lower layer terminal, and the single layer terminal is inserted and fixed in the terminal groove 14 from the side away from the insertion slot 11 to the side close to the insertion slot in the width direction of the insulating body 1.

[0051] The utility model is described above in combination with the best embodiment, but the utility model is not limited to the above disclosed embodiment, and should cover various modifications, equivalent combinations according to the essence of the utility model.

Claims

1. A high-speed, high-density plug-in connector, characterized in that, The application relates to an electronic module, which comprises the following parts: an insulating body with a longitudinal slot for inserting an electronic module, a plurality of terminal grooves arranged in the longitudinal side walls on both sides of the slot, an ear buckle accommodating space and a pivot joint part for pivotally connecting an ear buckle arranged at the end of the insulating body; at least one ear buckle pivotally connected to the end of the insulating body; a plurality of terminals accommodated in the corresponding terminal grooves in the longitudinal side walls, at least one double-layer terminal arranged in at least one terminal groove, and the rest of the terminal grooves being single-layer terminals; the double-layer terminal comprises a lower layer terminal and an upper layer terminal, the upper layer terminal of the double-layer terminal is fixed in the terminal groove from the side far away from the slot to the side close to the slot in the width direction of the insulating body, and the lower layer terminal of the double-layer terminal is fixed in the terminal groove from the bottom of the insulating body to the top; the single-layer terminal is fixed in the terminal groove from the bottom of the insulating body to the top or from the side far away from the slot to the side close to the slot in the width direction of the insulating body. When the single-layer terminal is fixed in the terminal groove from the bottom of the insulating body to the top, the single-layer terminal is flush with the lower layer terminal and forms a row; when the single-layer terminal is fixed in the terminal groove from the side far away from the slot to the side close to the slot in the width direction of the insulating body, the single-layer terminal is flush with the upper layer terminal and forms a row. When the single-layer terminal is flush with the lower layer terminal, the terminal groove accommodating the single-layer terminal penetrates the slot face of the longitudinal side wall and the bottom face of the insulating body at the position of the single-layer terminal, and the top end of the terminal groove accommodating the single-layer terminal is a closed end; at the position of the double-layer terminal, the terminal groove accommodating the lower layer terminal penetrates the slot face of the longitudinal side wall and the bottom face of the insulating body, the terminal groove accommodating the upper layer terminal penetrates the slot face and the face far away from the slot in the width direction of the longitudinal side wall, and the top end of the terminal groove accommodating the lower layer terminal and the top end of the terminal groove accommodating the upper layer terminal are closed ends. The top face of the longitudinal side wall is provided with a material removing groove at the position corresponding to the single-layer terminal, the inner side of the material removing groove is a retaining wall above the terminal groove accommodating the single-layer terminal, the upper end of the retaining wall is flush with the top face of the longitudinal side wall, and the inner side of the groove bottom of the material removing groove is connected with the outer side of the groove top of the terminal groove accommodating the single-layer terminal through a first clearance groove.

2. The high speed high density card connector of claim 1, wherein: At the position of the double-layer terminal, the terminal groove accommodating the lower layer terminal and the terminal groove accommodating the upper layer terminal are separated by a separating wall, the separating wall comprises a horizontal wall above the terminal groove accommodating the single-layer terminal and a vertical wall outside the terminal groove accommodating the single-layer terminal, the upper end of the vertical wall is connected with one side of the lower end of the horizontal wall, there is a second clearance groove between the upper end of the horizontal wall and the top face of the longitudinal side wall, the second clearance groove is connected with the slot, the outer side of the vertical wall is a through groove penetrating the face far away from the slot and the bottom face of the longitudinal side wall, and the through groove and the second clearance groove form the terminal groove accommodating the upper layer terminal.

3. The high speed high density card connector of claim 2, wherein: The face far away from the slot of the longitudinal side wall is recessed to form a groove near the bottom face of the longitudinal side wall, the groove is arranged along the longitudinal direction of the longitudinal side wall, and the groove is connected with the through groove.

4. The high speed high density connector of claim 3, wherein: The outer side of the vertical wall is recessed to form at least one embedding groove, and the slot side of the upper layer terminal is clamped and fixed in the embedding groove.

5. The high speed high density connector of claim 3, wherein: ​ 6. The high speed high density connector of claim 5, wherein: ​ 7. The high speed high density connector of claim 5, wherein: ​ 8. The high speed high density connector of claim 7, wherein: The contact part of the upper layer terminal is higher than that of the lower layer terminal, the welding part of the upper layer terminal is flush with that of the lower layer terminal, the welding part of the upper layer terminal and that of the lower layer terminal are towards the same direction, and the welding part of the single layer terminal and that of the lower layer terminal are towards the same direction.

9. The high speed high density connector of claim 8, wherein: The lower layer terminal comprises a fixed part fixed in the corresponding terminal groove, the fixed part extends upwards and downwards respectively to form an upper arm part one and a lower arm part one, the lower end of the lower arm part one is bent outwards to the insulating body to form the welding part of the lower layer terminal, and the upper end of the upper arm part one protrudes towards the insertion slot to form the contact part of the lower layer terminal.

10. The high speed high density connector of claim 8, wherein: The upper layer terminal comprises a holding part, the holding part extends upwards and downwards respectively to form an upper arm part two and a lower arm part two, the lower end of the lower arm part two is bent outwards to the insulating body to form the welding part of the upper layer terminal, the upper end of the lower arm part two is transversely bent towards the insertion slot to form a bent part, the inner end of the bent part is bent upwards to form an elastic force arm, the upper end of the elastic force arm is bent downwards to form the contact part of the upper layer terminal located in the second accommodation groove and extending into the insertion slot, and the holding part protrudes towards the insertion slot to form at least one holding arm, each holding arm is embedded and fixed in one of the embedded grooves.

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