Plug wire connector

Abstract

The utility model discloses a plug wire connector, which comprises a shell, an elastic sheet support and a wire pressing elastic sheet, the shell is provided with a wire plugging hole, the elastic sheet support is arranged in a cavity of the shell and is attached to the inner wall of the shell, the side wall of the elastic sheet support is provided with a first clamping hole, and the wire pressing elastic sheet comprises a wire pressing part and a fixing part. The bottom of the fixing part is bent to form a limiting part, the limiting part comprises a first limiting piece, a third limiting piece and a second limiting piece, the first limiting piece and the third limiting piece are oppositely arranged up and down, the second limiting piece is arranged between the first limiting piece and the third limiting piece, a first clamping block is arranged on the first limiting piece in a protruding mode, and a second clamping block is arranged on the third limiting piece in a protruding mode; the fixing part is clamped between the shell and the elastic piece support, and the limiting part is inserted into the first clamping hole so that the first clamping block and the second clamping block can be clamped and limited with the inner wall of the elastic piece support. According to the technical scheme, the geometrical shape of the wire pressing elastic sheet is changed, and the number of fixing points of the wire pressing elastic sheet is increased, so that the wire pressing elastic sheet has relatively high elastic force to clamp a wire harness.

Description

Technical Field

[0001] The utility model relates to the technical field of electric connectors, in particular to a plug-in connector. Background Art

[0002] At the construction site of communication equipment or electrical equipment, plug-in connectors are often needed. The plug-in connector has a wire insertion hole on the main insulator, and a wire pressing spring is arranged in the wire insertion hole. The wire pressing spring includes a fixed part and a wire pressing part that can rotate around the fixed part. When pressing the wire, the wire pressing part rotates under pressure. After the wire harness is inserted into the wire insertion hole, the pressure is released. The wire pressing part can press the wire harness tightly under its own elastic force. When the wire harness needs to be pulled out, just press the spring again to release the wire harness.

[0003] At present, the wire pressing spring is usually installed by inserting the lower end of the fixed part into the clamping hole of the spring bracket. Although this installation method that relies on only one fixed point can achieve easy pressing of the spring, the elastic force of the wire pressing spring is weak and the clamping force on the wire harness is insufficient. Utility Model Content

[0004] The main purpose of the utility model is to provide a plug-in wire connector, aiming to solve the problem that the wire pressing spring in the plug-in wire connector has insufficient clamping force on the wire harness.

[0005] To achieve the above-mentioned purpose, the wire connector proposed by the utility model includes a shell, a spring bracket and a wire pressing spring, the shell is provided with a wire insertion hole, the spring bracket is arranged in the chamber of the shell and is arranged in close contact with the inner wall of the shell, the side wall of the spring bracket is provided with a first clamping hole, the wire pressing spring includes a wire pressing part and a fixing part, the wire pressing part and the fixing part are bent, and the wire pressing part can rotate around the connection with the fixing part, the bottom of the fixing part is bent to form a limiting part, the limiting part and the wire pressing part are located on the same side of the fixing part, the limiting part includes a first limiting piece and a third limiting piece arranged opposite to each other up and down, and a second limiting piece arranged between the first limiting piece and the third limiting piece, the first limiting piece is convexly provided with a first clamping block, and the third limiting piece is convexly provided with a second clamping block. The fixing portion is clamped between the housing and the spring bracket, and the limiting portion is inserted into the first clamping hole so that the first clamping block and the second clamping block are clamped and limited with the inner wall of the spring bracket.

[0006] In one embodiment, the first clamping block is protruded on the top surface of the first limiting piece; or, the first clamping block is protruded on both sides of the first limiting piece.

[0007] In one embodiment, the second clamping block is protruded on the bottom surface of the third limiting piece; or, the second clamping block is protruded on both sides of the third limiting piece.

[0008] In one embodiment, the spring bracket is provided with an inwardly bent support platform at the bottom of the first clamping hole, and the bottom surface of the third limiting piece is arranged to fit with the surface of the support platform.

[0009] In one embodiment, the spring plate bracket includes a first enclosure, a second enclosure, and a third enclosure surrounded on three sides, the first enclosure and the third enclosure are arranged opposite to each other, and the second enclosure is arranged between the first enclosure and the third enclosure. The first clamping hole is provided on the first enclosure, the length of the first limiting piece and the third limiting piece is less than the width of the second enclosure, so that the second limiting piece is spaced from the third enclosure, and the distance between the second limiting piece and the third enclosure is at least equal to the diameter of the wiring harness to be inserted.

[0010] In one embodiment, a side wall of the housing that is in contact with the third enclosure is provided with a blocking block protruding inwardly, and an escape hole for the blocking block to pass through is opened on the third enclosure, and the blocking block is used to limit the insertion depth of the wiring harness to be inserted.

[0011] In one embodiment, the housing includes a first shell and a second shell, the upper end of the first shell is open, the lower end of the second shell is open, the second shell is detachably mounted on the first shell to dock with the first shell, the wire insertion hole is provided on the top surface of the second shell, and the spring bracket is provided in the chamber of the first shell to fit with the inner wall of the first shell. The plug-in connector also includes a wire pressing button, which is movably installed in the second shell, and is arranged above the wire pressing portion, so that the wire pressing button has a first state of pressing the wire pressing portion and a second state of releasing the wire pressing portion.

[0012] In one embodiment, the second shell is connected to the first shell by snap-fit ​​connection.

[0013] In one embodiment, the first shell includes a first sub-shell and a second sub-shell disposed in half, and the first sub-shell and the second sub-shell are detachably connected.

[0014] In one embodiment, the plug-in connector also includes a crown spring terminal, the spring bracket includes a vertical portion and a transverse portion bent with the vertical portion, the first clamping hole is opened on the vertical portion, and a second clamping hole is opened on the transverse portion, and the crown spring terminal is passed through the second clamping hole to be fixedly connected with the spring bracket.

[0015] Different from the traditional wire-pressing spring piece, the wire-pressing spring piece in the present technical solution is bent at the bottom of the fixed part to form a U-shaped limiting part, and the limiting part includes a first limiting piece and a third limiting piece arranged opposite to each other up and down, and a second limiting piece arranged between the first limiting piece and the third limiting piece. Specifically, the first limiting piece is arranged on the bottom surface of the fixed part and is bent with the fixed part, the second limiting piece is arranged at one end of the first limiting piece away from the fixed part and is bent with the first limiting piece, the third limiting piece is arranged at one end of the second limiting piece away from the first limiting piece and is bent with the second limiting piece, and the third limiting piece is bent with the first limiting piece. Among them, a first clamping block is convexly provided on the first limiting piece, and a second clamping block is convexly provided on the third limiting piece. During assembly, firstly, the limiting part of the spring clip bracket is inserted into the clamping hole, so that the first clamping block and the second clamping block are clamped and limited with the inner wall of the spring clip bracket. At this time, the fixing part is in contact with the outer wall of the spring clip bracket. Then, the spring clip bracket is installed in the cavity of the shell, so that the fixing part is clamped between the shell and the spring clip bracket. The technical solution of the utility model not only changes the geometric shape of the wire pressing spring clip, but also increases the fixing points of the wire pressing spring clip and the spring clip bracket, thereby enhancing the bending resistance of the wire pressing spring clip, so that the wire pressing spring clip has a higher elastic force to clamp the wire harness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a plug-in connector provided by the utility model;

[0018] Figure 2 An exploded view of an embodiment of a plug-in connector provided by the utility model;

[0019] Figure 3 A schematic diagram of the structure of a wire pressing spring in an embodiment of a plug-in connector provided by the utility model;

[0020] Figure 4 A schematic diagram of the structure of a spring bracket in an embodiment of a plug-in connector provided by the utility model;

[0021] Figure 5 A cross-sectional view of the assembled wire pressing spring and spring bracket in an embodiment of the plug-in connector provided by the utility model;

[0022] Figure 6This is a cross-sectional view of an embodiment of the plug-in connector provided by the utility model after the wire harness is inserted.

[0023] Description of Figure Numbers:

[0024] 100. Plug-in connector; 1. Shell; 11. First shell; 111. First sub-shell; 112. Second sub-shell; 12. Second shell; 121. Plug-in hole; 13. Blocking block; 2. Spring clip bracket; 21. Vertical portion; 211. First enclosure; 2111. First snap-in hole; 212. Second enclosure; 213. Third enclosure; 214. Support platform; 22. Horizontal portion; 221. Second snap-in hole; 3. Pressing spring; 31. Pressing portion; 32. Fixing portion; 33. Limiting portion; 331. First limiting piece; 3311. First snap-in block; 332. Second limiting piece; 333. Third limiting piece; 3331. Second snap-in block; 4. Pressing button; 5. Crown spring terminal; 200. Wiring harness.

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] The utility model provides a plug-in connector 100, see Figures 1 to 6 The wire connector 100 includes a shell 1, a spring bracket 2 and a wire pressing spring 3. The shell 1 is provided with a wire insertion hole 121. The spring bracket 2 is arranged in the cavity of the shell 1 and is fitted with the inner wall of the shell 1. The side wall of the spring bracket 2 is provided with a first clamping hole 2111. The wire pressing spring piece 3 includes a wire pressing part 31 and a fixing part 32, the wire pressing part 31 and the fixing part 32 are bent, and the wire pressing part 31 can rotate around the connection with the fixing part 32, the bottom of the fixing part 32 is bent to form a limiting part 33, the limiting part 33 and the wire pressing part 31 are located on the same side of the fixing part 32, the limiting part 33 includes a first limiting piece 331 and a third limiting piece 333 arranged opposite to each other up and down, and a second limiting piece 332 arranged between the first limiting piece 331 and the third limiting piece 333, a first clamping block 3311 is convexly provided on the first limiting piece 331, and a second clamping block 3321 is convexly provided on the third limiting piece 333. Among them, the fixing part 32 is clamped between the housing 1 and the spring bracket 2, and the limiting part 33 is inserted into the first clamping hole 2111, so that the first clamping block 3311 and the second clamping block 3321 are clamped and limited with the inner wall of the spring bracket 2.

[0030] The embodiment of the plug-in connector 100 includes a housing 1, a spring bracket 2, a wire pressing spring 3 and a wire pressing button 4, wherein the spring bracket 2 is arranged in the chamber of the housing 1 to support and fix the wire pressing spring 3, the wire pressing spring 3 includes a fixing portion 32 and a wire pressing portion 31 which is arranged at one end of the fixing portion 32 and is bent with the fixing portion 32, a wire insertion hole 121 is opened on the top surface of the housing 1, and the wire insertion hole 121 is located above the wire pressing portion 31, and at the same time, the wire pressing button 4 can be moved up and down and is arranged above the wire pressing portion 31. In the initial state, the wire pressing part 31 blocks the wire insertion hole 121. When inserting the wire, the wire pressing button 4 can be pressed down to press the wire pressing part 31. The wire pressing part 31 rotates around the connection between it and the fixing part 32 to avoid the wire insertion hole 121. Then the wire harness 200 can be inserted from the wire insertion hole 121. When the wire harness 200 is inserted to a suitable depth, release the button, and the wire pressing part 31 can press the wire harness 200 under its own elastic force. When the wire harness 200 needs to be pulled out, just press the spring again to release the wire harness 200, so as to achieve quick plugging and unplugging of the wire harness 200.

[0031] The conventional wire pressing spring usually only includes a fixing portion 32 and a wire pressing portion 31, and the installation method is to first open a clamping hole on the side wall of the spring bracket 2, and then pass the fixing portion 32 through the clamping hole from the outside to the inside, so that the upper end of the fixing portion 32 is in contact with the outer wall of the wire pressing spring 3, and the lower end of the fixing section is in contact with the inner wall of the wire pressing spring 3. Although this method of fixing only by the lower end fixing point can realize easy pressing of the spring, the elastic force of the wire pressing spring 3 is weak, and the clamping force on the wire harness 200 is insufficient.

[0032] Reference Figure 3 , different from the traditional wire pressing spring piece 3, the wire pressing spring piece 3 in the technical solution is bent at the bottom of the fixed part 32 to form a U-shaped limiting part 33, and the limiting part 33 includes a first limiting piece 331 and a third limiting piece 333 arranged opposite to each other up and down, and a second limiting piece 332 arranged between the first limiting piece 331 and the third limiting piece 333. Specifically, the first limiting piece 331 is arranged on the bottom surface of the fixed part 32 and is bent with the fixed part 32, the second limiting piece 332 is arranged at one end of the first limiting piece 331 away from the fixed part 32 and is bent with the first limiting piece 331, the third limiting piece 333 is arranged at one end of the second limiting piece 332 away from the first limiting piece 331 and is bent with the second limiting piece 332, and the third limiting piece 333 is bent with the first limiting piece 331. The first limiting piece 331 is provided with a first clamping block 3311, and the third limiting piece 333 is provided with a second clamping block 3321. The material of the pressing spring piece 3 can be stainless steel or copper alloy, which is easy to obtain and easy to press into shape.

[0033] The assembly steps of the plug-in connector 100 are as follows: first, insert the limiting portion 33 of the spring bracket 2 into the first clamping hole 2111, so that the first clamping block 3311 and the second clamping block 3321 are clamped and limited with the inner wall of the spring bracket 2. At this time, the fixing portion 32 is in contact with and fits with the outer wall of the spring bracket 2. Subsequently, the spring bracket 2 is installed into the cavity of the shell 1, so that the fixing portion 32 is clamped between the shell 1 and the spring bracket 2, and the wire pressing portion 31 is arranged opposite to the wire insertion hole 121.

[0034] For example, the first clamping block 3311 can be protruded from the top surface of the first limiting plate 331, so that when the wire pressing spring sheet 3 is installed, the first clamping block 3311 and the top edge of the first clamping hole 2111 of the spring sheet bracket 2 are clamped and limited; or, the first clamping block 3311 can be protruded from both sides of the first limiting plate 331, so that when the wire pressing spring sheet 3 is installed, the first clamping block 3311 and the side edge of the first clamping hole 2111 of the spring sheet bracket 2 are clamped and limited.

[0035] Similarly, the second clamping block 3321 can be protruded on the bottom surface of the third limiting piece 333. When the wire pressing spring piece 3 is installed, the second clamping block 3321 and the bottom edge of the first clamping hole 2111 of the spring piece bracket 2 are clamped and limited; or, the second clamping block 3321 can be protruded on both sides of the third limiting piece 333. When the wire pressing spring piece 3 is installed, the second clamping block 3321 and the side edge of the clamping hole of the spring piece bracket 2 are clamped and limited.

[0036] In the embodiment shown in the figure, the first clamping block 3311 is convexly arranged on the top surface of the first limiting piece 331, and the second clamping block 3321 is convexly arranged on the side of the third limiting piece 333. Then, the first limiting block is clamped and limited with the top edge of the clamping hole, and the second clamping block 3321 is clamped and limited with the side edge of the clamping hole. Of course, in actual application, the positions of the first clamping block 3311 and the second clamping block 3321 can be flexibly replaced and combined, which is not limited here.

[0037] In summary, the technical solution of the utility model not only changes the geometric shape of the wire pressing spring piece 3, but also increases the fixing points of the wire pressing spring piece 3 and the spring piece bracket 2, thereby enhancing the bending resistance of the wire pressing spring piece 3, and allowing the wire pressing spring piece 3 to have a higher elastic force to clamp the wire harness 200.

[0038] It is not difficult to understand that the pressing force applied by the pressing button 4 to the pressing part 31 is transmitted to the limiting part 33, which will cause the limiting part 33 to generate torque, thereby causing the limiting part 33 to bend and deform. In order to avoid this phenomenon, in one embodiment of the utility model, refer to Figure 4 and Figure 5The spring sheet bracket 2 is provided with an inwardly bent support 214 at the bottom of the first clamping hole 2111, and the bottom surface of the third limiting piece 333 is arranged in contact with the surface of the support 214. The support 214 supports and resists the limiting portion 33, preventing the limiting portion 33 from tilting downward under the action of the torque, so that the entire wire pressing spring sheet 3 is not easy to deform, and the wire pressing portion 31 has a strong bending resistance, thereby having a large clamping force.

[0039] Please continue to refer to Figure 4 In the present plug-in connector 100, the spring clip bracket 2 includes a first enclosure 211, a second enclosure 212 and a third enclosure 213 surrounded on three sides, the first enclosure 211 and the third enclosure 213 are arranged opposite to each other, and the second enclosure 212 is arranged between the first enclosure 211 and the third enclosure 213. At this time, the first clamping hole 2111 is opened on the first enclosure 211, and the limiting portion 33 passes through the first clamping hole 2111 to be suspended in the chamber surrounded by the three enclosures. Among them, the length of the first limiting piece 331 and the third limiting piece 333 is less than the width of the second enclosure 212, so that when the wire pressing spring clip 3 is installed on the spring clip bracket 2, the second limiting piece 332 and the third enclosure 213 are spaced apart, and the distance between the second limiting piece 332 and the third enclosure 213 is at least equal to the diameter of the wiring harness 200 to be plugged in, thereby facilitating the plugging and unplugging of the wiring harness 200. When the distance between the second limiting piece 332 and the third enclosure plate 213 is just equal to the diameter of the wire harness 200 to be inserted, precise insertion of the wire harness 200 can be achieved.

[0040] Furthermore, a blocking block 13 is protruded inwardly on the side wall of the housing 1 that is in contact with the third enclosure 213, and an escape hole for the blocking block 13 to pass through is provided on the third enclosure 213. The blocking block 13 is used to limit the insertion depth of the wiring harness 200 to be inserted. When the wiring harness 200 to be inserted is inserted to the point where it abuts against the top surface of the blocking block 13, it indicates that the wiring harness 200 to be inserted is inserted in place, thereby preventing the wiring harness 200 from being inserted too deep.

[0041] In one embodiment of the utility model, the shell 1 includes a first shell 11 and a second shell 12. The upper end of the first shell 11 is opened, and the lower end of the second shell 12 is opened. The second shell 12 is detachably mounted on the first shell 11 to dock with the first shell 11. At this time, the wire insertion hole 121 is opened on the top surface of the second shell 12, and the spring bracket 2 is arranged in the chamber of the first shell 11 to fit with the inner wall of the first shell 11. The wire pressing button 4 can be installed in the second shell 12 so as to be movably installed up and down, and the wire pressing button 4 is arranged above the wire pressing part 31, so that the wire pressing button 4 has a first state of pressing the wire pressing part 31 and a second state of releasing the wire pressing part 31.

[0042] In this embodiment, the pressing button 4 is assembled with the second housing 12 and then docked with the first housing 11, thereby facilitating the assembly and disassembly of the pressing button 4. The second housing 12 and the first housing 11 can be snap-fitted, thereby facilitating the quick connection of the second housing 12 and the first housing 11.

[0043] Further, see Figure 2 The first housing 11 includes a first sub-housing 111 and a second sub-housing 112 which are arranged in half. The first sub-housing 111 and the second sub-housing 112 are detachably connected, such as a snap connection, so as to facilitate the disassembly and assembly of the spring bracket 2.

[0044] An embodiment of the plug-in connector 100 further includes a crown spring terminal 5, such as Figure 4 As shown, in order to realize the installation of the crown spring terminal 5, the spring bracket 2 includes a vertical portion 21 and a horizontal portion 22 bent with the vertical portion 21, a first clamping hole 2111 is provided on the vertical portion 21, a second clamping hole 221 is provided on the horizontal portion 22, and the crown spring terminal 5 is passed through the second clamping hole 221 to be fixedly connected with the spring bracket 2. In the embodiment shown in the figure, the vertical portion 21 is composed of three enclosures, and the horizontal portion 22 is provided at the bottom of the third enclosure 213 and bent with the third enclosure 213. Of course, in actual application, the position of the horizontal portion 22 can be flexibly adjusted, which is not limited here.

[0045] Correspondingly, the housing 1 includes a vertical shell and a horizontal shell. The vertical portion 21 of the spring bracket 2 is arranged in the chamber of the vertical shell, and the horizontal portion 22 of the spring bracket 2 is arranged in the chamber of the horizontal shell. The horizontal shell is provided with an avoidance hole arranged opposite to the second clamping hole 221.

[0046] It should be noted that the crown spring terminal 5 is a conductive contact terminal used to connect the male pin and the female pin in the electrical connector, and the crown spring terminal 5 is a mature product on the market, which will not be described in detail here. This embodiment is provided with both the wire pressing spring 3 and the crown spring terminal 5, so that it can meet the plug-in requirements of different wire harnesses 200, thereby enhancing the universality of the plug-in connector 100.

[0047] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A plug-in connector, characterized in that: include: A shell, wherein a wire insertion hole is provided on the shell; A spring bracket, the spring bracket being arranged in the chamber of the shell and being closely attached to the inner wall of the shell, and a first clamping hole being formed on a side wall of the spring bracket; A wire pressing spring sheet, the wire pressing spring sheet comprises a wire pressing portion and a fixing portion, the wire pressing portion and the fixing portion are bent and arranged, and the wire pressing portion can rotate around the connection with the fixing portion, the bottom of the fixing portion is bent to form a limiting portion, the limiting portion and the wire pressing portion are located on the same side of the fixing portion, the limiting portion comprises a first limiting piece and a third limiting piece arranged opposite to each other up and down, and a second limiting piece arranged between the first limiting piece and the third limiting piece, the first limiting piece is convexly provided with a first clamping block, and the third limiting piece is convexly provided with a second clamping block; The fixing portion is clamped between the housing and the spring bracket, and the limiting portion is inserted into the first clamping hole so that the first clamping block and the second clamping block are clamped and limited with the inner wall of the spring bracket.

2. The plug connector according to claim 1, characterized in that The first clamping block is protruded on the top surface of the first limiting piece; or the first clamping block is protruded on both sides of the first limiting piece.

3. The plug connector according to claim 1, characterized in that The second clamping block is protruded on the bottom surface of the third limiting piece; or, the second clamping block is protruded on both sides of the third limiting piece.

4. The plug connector according to claim 1, wherein: The spring bracket is provided with an inwardly bent support platform at the bottom of the first clamping hole, and the bottom surface of the third limiting piece is arranged to fit with the table surface of the support platform.

5. The plug connector according to claim 4, characterized in that The spring plate bracket includes a first enclosure plate, a second enclosure plate and a third enclosure plate surrounded on three sides, the first enclosure plate and the third enclosure plate are arranged opposite to each other, and the second enclosure plate is arranged between the first enclosure plate and the third enclosure plate; Among them, the first clamping hole is opened on the first enclosure, the length of the first limiting plate and the third limiting plate is smaller than the width of the second enclosure, so that the second limiting plate and the third enclosure are spaced apart, and the distance between the second limiting plate and the third enclosure is at least equal to the diameter of the wiring harness to be inserted.

6. The plug connector according to claim 5, characterized in that A blocking block is protruded inwardly from the side wall of the shell that is in contact with the third enclosure, and an escape hole for the blocking block to pass through is opened on the third enclosure. The blocking block is used to limit the insertion depth of the wiring harness to be inserted.

7. The plug connector according to claim 1, wherein: The housing includes a first shell and a second shell, the upper end of the first shell is opened, the lower end of the second shell is opened, the second shell is detachably sleeved on the first shell to dock with the first shell, the wire insertion hole is opened on the top surface of the second shell, and the spring bracket is arranged in the cavity of the first shell to fit with the inner wall of the first shell; The plug connector also includes a wire pressing button, which is installed in the second shell body so as to be movable up and down, and is arranged above the wire pressing part so that the wire pressing button has a first state of pressing the wire pressing part and a second state of releasing the wire pressing part.

8. The plug connector according to claim 7, characterized in that The second shell is connected to the first shell by snap-fit ​​connection.

9. The plug connector according to claim 7, wherein: The first shell includes a first sub-shell and a second sub-shell that are disposed in half, and the first sub-shell and the second sub-shell are detachably connected.

10. The plug connector according to claim 1, wherein: The plug-in connector also includes a crown spring terminal, the spring bracket includes a vertical portion and a transverse portion bent with the vertical portion, the first clamping hole is opened on the vertical portion, the transverse portion is provided with a second clamping hole, and the crown spring terminal is passed through the second clamping hole to be fixedly connected with the spring bracket.

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