CN111262080A - PC board end anti-loosening and interference-free female connector - Google Patents

Abstract

The PC board end is anti-loose and interference-free female connector, the elastic contact terminal (21) is embedded in the insert groove (227); the front end of the elastic contact terminal (21) is provided with a neck socket, and the inner side of the neck socket is elastic The ring segment is shrink-wrapped, the rear segment of the elastic contact terminal (21) is bent downward and horizontally extends to the rear end of the insert groove (227) on the rear end surface of the plastic body (22); The side edges are respectively provided with at least one anti-mis-insertion plastic boss (222), and at least one anti-dropping buckle (223) is provided on the top surface of the front part of the plastic body (22); The protruding rear top platform (225) is provided with outwardly protruding second-order guiding edges (228) extending forward and backward on the outer walls on both sides of the front part of the plastic body (22). By changing the traditional board-to-wire connection method, the anti-interference performance is significantly improved, the signal transmission speed is increased, the reliability of product connection is improved, and the structure is simple and easy to manufacture, saves the design space of the board, replaces all functions of the electronic connection line, supports the board to The board is effectively and stably connected.

Description

PC board end anti-loosening and interference-free female connector

technical field

The present invention relates to IPC classification H01R, the technology of conductive connection device, especially the anti-loosening and interference-free female connector of PC board end.

Background technique

The connector is generally composed of a plug and a socket, in which the plug is also called a free end connector, and the socket is also called a fixed connector. The connection and disconnection of circuits are realized by plugs, sockets and insertion and separation, so various connection methods of plugs and sockets are produced. For circular connectors, there are mainly three ways: threaded connection, bayonet connection and marble connection. Among them, the threaded connection is the most common, but the connection speed is slow and it is not suitable for occasions that require frequent plugging and quick connection. The bayonet type connection has a faster connection speed due to the longer lead of its three bayonet slots, but it is more complicated to manufacture and the cost is higher. The marble connection is the fastest connection among the three connection methods. It does not need to perform rotational movement, but only needs to perform linear movement to realize the functions of connection, separation and locking. Since it is a direct push-pull connection, it is only suitable for connectors with a small total separation force. Generally more common in small connectors.

The most critical design of the connector is the contact formed by the female terminal and the male pin. Contact material selection should be based on performance. Must ensure reliable contact after mating.

Board connector products are widely used in smart phones, medium tablet computers, sports DV, driving recorders, car aviation, PDA, smart home, video doorbells, notebook computers, security lenses, camera modules, digital cameras, printers, scanners Instruments, Peter machines, medical equipment, televisions, video phones, cash registers, monitoring and communication systems and computer peripherals.

Board-to-board connectors can effectively simplify applications that require parallel stacking of printed circuit boards (PCBs). These connectors are available in positions ranging from 40 to 440, with contact pitches of 0.5, 0.6, 0.8 and 1.0mm, and by mating various combinations of vertical plug and receptacle jacket heights from 4mm to 20mm board-to-board stack height (in 1mm increments).

Board-to-board connectors are essential miniature coupling plugs and sockets that allow direct connection of power and signals between printed circuit boards (PCBs) through the pins of the connector. Board-to-board connectors typically use copper alloys and need to be protected from oxidation to prevent loss of conductivity.

As an improvement technique, less disclosure:

The Chinese patent application 201320487683.9 filed by Qingliang Electronics Co., Ltd. provides a board-side connector that can reduce crosstalk interference. Including an insulating seat and a plurality of conductive terminals. The insulating seat is elongated and its length direction is defined as the first direction. The insulating seat includes a groove body and a tongue plate. The groove body has a bottom wall and a ring side wall surrounding the circumference of the bottom wall. The tongue plate starts from the inner edge of the bottom wall along the first direction. The direction protrudes and extends. These conductive terminals pass through the bottom wall of the groove body, the part of each conductive terminal located in the groove body is defined as the plug-in part, the part of each conductive terminal located outside the groove is defined as the fixed part, and the part of each plug-in part is defined as the fixed part. The distance from the tip to the bottom wall is less than the distance from the tip of the tongue to the bottom wall. The conductive terminals are respectively arranged in two rows along the first direction, the insertion parts of the two rows of conductive terminals are respectively arranged on opposite sides of the tongue plate, and there is a distance between the insertion parts of each conductive terminal and the tongue plate .

The Chinese patent application No. 201120296706.9 filed by Kanglian Precision Electromechanical (Shenzhen) Co., Ltd. relates to a connector board-end socket, suitable for micro board-end socket welding, including an insulating body, a plurality of upper terminals, a plurality of lower terminals and a shielded iron shell, The front end of the insulating body is provided with a through slot, the plurality of upper terminals and the plurality of lower terminals are respectively located on the upper and lower sides of the through slot of the insulating body, and the shielding iron shell is sleeved on the insulating body, and is located at the upper and lower sides of the through slot of the insulating body. The shielding iron shell is provided with directly punched feet for keeping the balance of the board-end female seat, and the height of the feet is in the same plane as the welding surface of the terminal.

The Chinese patent application 201721235710.8 filed by Foxconn (Kunshan) Computer Connector Co., Ltd. and Hongteng Precision Technology Co., Ltd. discloses a board-end connector, which is welded to a circuit board and includes an insulating body and conductive terminals held on the insulating body. and a metal shell, the insulating body includes a base, the metal shell is arranged around the base, the conductive terminal has a welding portion extending out of the side edge of the base, and the side wall of the metal shell is connected to the base. Spacer blocks are spaced between the welded parts in the up-down direction. The design of the spacer block makes the side wall of the metal shell and the welding part of the conductive terminal not in contact to cause a short circuit, so as to ensure the safety of the product.

The Chinese patent application 201820865311.8 filed by Yazaki (China) Investment Co., Ltd. discloses a board end connector, which has the beneficial effects of high assembly and welding efficiency, improved product quality, and reduced product cost. It includes a housing and a pin assembly, the pin assembly includes a plurality of terminal pins, and the plurality of terminal pins are partially arranged in the housing and partly extend to the outside of the housing. The board end connector also includes: at least two positioning and fixing columns, at least two positioning and fixing columns are arranged on the housing at intervals, the positioning and fixing columns include a connecting part, a positioning part and a fixing part, one end of the connecting part is connected with the housing, and the positioning part The positioning part and the fixing part are both connected to the other end of the connecting part, the positioning part and the fixing part are arranged at intervals, a groove is formed between the positioning part and the fixing part, and the side opposite to the groove is provided with a fixing protrusion on the fixing part.

At present, the board end connectors circulating on the market are used in conjunction with electronic wire connectors. Since the connector at the PC board end or the board end male socket connector 1 is fixed, the signal or power connection between the PC board and the PC board, or between the PC board and the housing connector in all existing electrical appliances, is a It is realized by the combination of two wire-end female connectors 01, electronic connecting wires 03 and short terminals 02, namely electronic wire connector O; as shown in Figures 1 and 2, the electronic wire connector O needs to use short terminals After the 02 is crimped with the electronic connecting wire 03, the two ends of the electronic connecting wire 01 are respectively inserted into the board-end male socket connector 1 through an electronic wire connector 0 to realize the signal or power connection between the PC board and the PC board. Such existing electronic wire connectors O are suspended in the chassis of electrical equipment, and the disadvantages include:

1) The electronic connecting line product is connected between the PC board and the PC board, and there is a factor of signal interference;

2) The electronic connecting wire product is easy to loose, and there is a hidden danger of poor contact with the board end connector;

3) The production and material costs of the entire electronic connecting line are high, and the process is complicated;

4) Although the transmission rate does not change significantly under the condition of transmitting power, in the condition of transmitting weak electrical signals, the signal transmission rate will be significantly slower due to the addition of an electronic connection line O1 between the PC board and the PC board. .

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a PC board end anti-loosening and interference-free female socket connector, which supports the effective and stable connection of the board to the board, replaces the existing wire end connector, and solves the problems of the prior art.

The object of the present invention will be achieved through the following technical measures: the board-end connector includes a plastic body, and a group of elastic contact terminals installed in the plastic body; in the plastic body, at least one row of parallel inlays are arranged in parallel and spaced apart in the front and rear directions in the plastic body. slot, the elastic contact terminal is embedded in the slot; the slot has a front insertion hole at the opening on the front face of the plastic body; the elastic contact terminal is connected as a whole by the bottom strip from front to back, wherein the front end of the elastic contact terminal and the Both sides of the middle section are bent upwards, the front end of the elastic contact terminal has a neck socket, and there is an elastic shrink wrap ring section on the inside of the neck socket, and the rear section of the elastic contact terminal is bent downward and horizontally protrudes to the rear end. The opening on the rear end surface; the bottom side of the front part of the plastic body has a front bottom platform higher than the bottom surface, and the edges of the two sides of the top surface of the front part of the plastic body are respectively provided with at least one anti-insertion plastic boss, on the top surface of the front part of the plastic body at least one There is an anti-falling buckle, a rear top platform that protrudes upwards at the rear of the top surface of the plastic body, and second-order guide edges that protrude outwards on both sides of the outer wall of the front of the plastic body.

In particular, the upper part of the anti-insertion plastic boss is in the shape of a rectangular block, and the top of the anti-falling buckle is in the shape of an arc.

In particular, the top surface of the anti-missing plastic boss is higher than the anti-dropping buckle.

In particular, the inner wall of the front insertion hole has a tapered centripetal alignment guide surface.

In particular, at least one segment of edges on both sides of the rear part of the elastic contact terminal is clamped into the inner wall of the embedding groove.

In particular, the plastic body is formed by at least two upper and lower mounting plates with a slotted structure that cooperate with each other and fixedly combined after the elastic contact terminals are embedded.

In particular, the rear section of the second-order guide edge is more protruding and stepped than the front section.

In particular, the rear outer wall of the plastic body protrudes symmetrically outward from the rear side of the second-order guide edge, and the front end surface of the protruding portion and the bottom surface of the part are fixed with an angular grounding piece.

In particular, there is a group of tubular material escape holes which are arranged in parallel and open to the rear side in the rear top table.

In particular, at least two or more bottom struts are evenly arranged in parallel along the front-rear direction on both sides or the middle of the bottom surface of the rear part of the plastic body.

The advantages and effects of the invention: change the traditional board-to-line connection mode, innovate the board-end female connection structure, significantly improve the anti-interference performance, increase the signal transmission speed, improve the reliability of product connection, and the structure is simple and convenient for processing and manufacturing, saving energy Substrate design space, reduce product cost, wide application range, and replace all functions of electronic connection lines.

Description of drawings

FIG. 1 is a schematic structural diagram of a conventional electronic wire connector.

FIG. 2 is a schematic diagram of a plug-in structure of an existing electronic wire connector and a board-end male connector.

FIG. 3 is a schematic diagram of the plug-in structure of the board-end connector and the board-end male socket connector according to Embodiment 1 of the present invention.

FIG. 4 is a schematic diagram of a partial cross-sectional structure of FIG. 3 .

5 , 6 , 7 , and 8 are three-dimensional schematic views of the external structure of the board-end connector according to Embodiment 1 of the present invention from different perspectives.

9 is a schematic diagram of a partial vertical cross-sectional structure along the front and rear extension directions of the insert groove according to Embodiment 1 of the present invention.

10 is a schematic diagram of a partial horizontal cross-sectional structure along the front and rear extension directions of the insert groove according to Embodiment 1 of the present invention.

FIG. 11 is a schematic diagram of the plug-in structure of the male terminal and the elastic contact terminal in Embodiment 1 of the present invention.

Reference numerals include:

0-electronic wire connector, 1-board end male connector, 2-board end connector, 01-wire end female connector, 02-short terminal, 03-electronic connecting wire, 11-male terminal, 21 -Elastic contact terminal, 22-plastic body, 23-grounding plate, 221-material escape hole, 222-anti-insertion plastic boss, 223-anti-dropping buckle, 224-front insertion hole, 225-rear top table, 226-Front base, 227-Inlay groove, 228-Second-order guide edge, 229-Bottom support.

Detailed ways

The principle of the present invention is that the function of the electrical connector is mainly to transmit the communication signal from one circuit system to another circuit system by means of the terminals. Therefore, after the male and female connectors are mated, it is necessary to ensure that the male and female terminals are seated correctly and produce good Electrical conduction, in addition to relying on the housing and shell of the male and female terminals to make the male and female terminals in the correct mating position, but also to ensure that the contact positive force between the male and female terminals is large enough to allow the telecommunication to pass through the contact smoothly. If the contact positive force is insufficient, the microstructure of the contact surface of the male and female terminals is similar to only a small number of local fine contact points or contact areas, and the contact resistance value may even be as large as several ohms or more, resulting in a large potential drop, so that the communication receiving end cannot perform noise removal processing.

In the present invention, the application environment is not limited to the number of connection pins, and at the same time, the number of terminal connection rows can also be more than one row.

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Embodiment 1: As shown in FIGS. 3 to 10, the board connector 2 includes a plastic body 22 and a set of elastic contact terminals 21 installed in the plastic body 22; A row of inserting grooves 227 parallel to each other, the elastic contact terminal 21 is embedded in the inserting groove 227; the inserting groove 227 has a front insertion hole 224 at the opening on the front end surface of the plastic body 22; The board is connected as a whole, wherein the front end and both sides of the middle section of the elastic contact terminal 21 are bent upward, the front end of the elastic contact terminal 21 has a neck socket, and there is an elastic shrink wrap ring section on the inner side of the neck socket, after the elastic contact terminal 21 The section is bent downward horizontally and protrudes from the opening of the insert groove 227 on the rear surface of the plastic body 22 to the rear end; The edges are respectively provided with at least one anti-insertion plastic boss 222, on the top surface of the front part of the plastic body 22 there is at least one anti-dropping buckle 223, and on the rear part of the top surface of the plastic body 22 there is a rear top platform 225 protruding upwards. On the outer walls on both sides of the front part of the plastic body 22 are second-order guiding edges 228 that protrude outward and extend forward and backward.

In the above, the upper part of the anti-misinsertion plastic boss 222 is in the shape of a rectangular block, and the top of the anti-falling buckle 223 is in the shape of a circular arc.

In the foregoing, the top surface of the anti-misinsertion plastic boss 222 is higher than the anti-dropping buckle 223 .

As mentioned above, the inner wall of the front insertion hole 224 has a conical centripetal alignment guide surface.

In the foregoing, at least one edge of the elastic contact terminal 21 on both sides of the rear portion is clamped into the inner wall of the embedding groove 227 .

As mentioned above, the plastic body 22 is formed by at least the upper and lower mounting plates with the structure of the inserting grooves 227 , which are fitted with each other and fixedly combined after inserting the elastic contact terminals 21 .

In the foregoing, the rear section of the second-order guide edge 228 is more protruding than the front section and is stepped.

In the above, the rear outer wall of the plastic body 22 protrudes symmetrically outwardly from the rear side of the second-order guide edge 228 , and the front end surface of the protruding portion and the bottom surface of the portion are fixed to the angular grounding plate 23 .

As mentioned above, the rear top table 225 has a group of tubular material escape holes 221 which are arranged in parallel and open to the rear side.

In the foregoing, at least two or more bottom struts 229 are evenly arranged in parallel along the front-rear direction at the edges or the middle of the bottom surface of the rear portion of the plastic body 22 .

In the embodiment of the present invention, the height of the front end surface of the plastic body 22, that is, the distance from the front bottom platform 226 surface to the front end top surface of the plastic body 22, is the same as the height of the socket on the front end surface of the board-end male connector 1, and the board-end male socket is connected The inner walls on both sides of the socket on the front end face of the device 1 are respectively provided with guiding friction stepped locking chute which is matched with the second-order guiding edge 228 . Because the front base 226 makes the front plug structure of the plastic body 22 higher than the installation surface, the raised space is convenient for accommodating the socket bottom structure of the front end surface of the board-end male connector 1 .

In the embodiment of the present invention, the material of the elastic contact terminal 21 is C5210 or C5191, and the contact area of the terminal is plated with gold film. Since the plugging life of I/O connectors is generally set at thousands of times, it means that the terminals must be elastically deformed when mating to maintain a proper contact normal force at the end of the plugging resistance test. In addition, The thickness of the gold-plated film in the contact area of the terminal must also be able to withstand thousands of times of wear and tear. Usually, the docking conn and module conn must withstand 5,000 times of insertion and removal. The gold plating in the contact area is 30micro-inch min. In order to make the overall insertion force of the connector not too large, so as not to use the terminal smoothly or even cause the terminal to be pushed back and collapsed, it must be noted that the guiding slope of the front end of the terminal should not be too steep, and it is generally designed at an angle of less than 40 degrees. The holding force specification of the terminal is set, because the holding force of the connector will decrease after the high temperature of SMT. Therefore, when the holding force is measured on the production line, the required lower limit of the specification is significantly larger than the insertion force of the terminal mating. For example, each time the holding force is measured. The mating insertion force of a terminal is 30gf, but the holding force is set at 300gf min, which is to take into account the variation of tolerances, the harsh conditions of user insertion and extraction, and the destructive power of SMT high temperature. When the elastic terminal is mated with male and female, the place with the largest internal stress is at the root of the cantilever. Any stress concentration should be avoided near this place. The crack caused by the too small bending radius of the elastic terminal at the root of the cantilever is a serious stress concentration. Bending with too small radius near the root of the elastic terminal should be avoided. If bending is necessary, it is recommended to take the bending radius of more than twice the minimum R/T ratio of the material to avoid cracks. Alternatively, the terminal is designed to be subjected to secondary bending after electroplating and then assembled. The secondary bending point should be covered by the tin-lead plating area, because the tin-lead coating is softer and has better ductility than the nickel coating, and it is less likely to be caused by the secondary bending. Coating cracks are produced by bending, but it is also easier to be scratched by the bending jig because it is relatively soft.

In the embodiment of the present invention, the plastic body 22 is used as the housing component, which is the main component of the entire connector, and other parts need to be assembled on it. In addition to the spatial positioning of the elastic contact terminal 21 by housing, it must also rely on the holding force of the housing to generate the boundary conditions on the mechanical behavior of the terminal, thereby generating an appropriate normal force when the male and female seats are mated, and at the same time. , to avoid the situation of withdrawing the pin. Therefore, the size and shape of the interference section of the elastic contact terminal 21 and the housing of the plastic body 22 need to be properly matched. Appropriate shape of the barbs of the elastic contact terminals 21 and the amount of interference can obtain a proper terminal holding force, and the housing will not be deformed or broken due to excessive interference. In addition, in terms of electrical function, the plastic body 22 is used as a housing component, which is responsible for the insulation function between the conductor parts. In terms of the resistance value of general engineering plastics, only when the material with strong hygroscopicity or the terminal is pressed into the plastic barrier In the case of rupture, the insulation resistance or withstand voltage of the plastic part may be unqualified. Otherwise, the most worry is the insulation effect between the conductor parts exposed outside the plastic, the thermal deformation temperature of the plastic body 22 and the general SMT. , The process temperature is compared to distinguish the high temperature material and the low temperature material. A set of material escape holes 221 opening to the rear side is designed in the middle of the rear top table 225 on the plastic body 22 , which is convenient for precise production and safe use.

In the embodiment of the present invention, the embedded groove 227 is used as a feature structure, and it is necessary to properly use geometric tolerances such as alignment, flatness, and contour, and set a dimensional tolerance of +/- 0.02 mm to ensure the function.

In the embodiment of the present invention, the double-locking design of the anti-insertion plastic boss 222, the anti-falling buckle 223, the positive locking buckle and the friction locking buckle is adopted, and is matched with the rear top platform 225, the front bottom platform 226 and the second-order guide edge. The 228 omnidirectional centralizing and positioning structure meets different needs. The connection between the board-end male connector 1 and the board-end connector 2 implements double locking and double safety insurance, which ensures the reliable connection between the male socket terminal 11 and the elastic contact terminal 21. And no special tools are required for on-site disassembly, repair and replacement of cables.

In the embodiment of the present invention, in order to prevent the connector from being half-inserted and ensure the stable combination of the male terminal 11 and the elastic contact terminal 21 in the plug-in connection structure, the plug-in locking and connection of the male terminal 11 and the elastic contact terminal 21 are completed at the same time. To avoid the half-plug situation, the operator will have a very good plug-in operation feel. The feedback vibration and slight response voiceprint generated during the plug-in process remind the operator whether the plug-in lock is stable and reliable. At the same time, in order to prevent the reverse insertion operation, a pair of anti-mis-insertion plastic bosses 222 located on both sides of the front top surface allow the insertion operation to be carried out smoothly only when it is correctly inserted, so that the board-end connector 2 can be inserted correctly. Inside the socket on the front face of the board-end male connector 1.

In the embodiment of the present invention, the bottom of the board end connector 2 is fixed on the board end of the PCB, the rear end of the board end connector 2 is connected to the PIN circuit through the tail end of the elastic contact terminal 21, and the front end of the board end connector 2 is directly inserted into the board end male socket connector 1. In the socket, the forward and reverse insertion directions are identified by the anti-mis-insertion plastic boss 222, and the second-order guide edge 228 guides and aligns to ensure that the male terminal 11 is inserted into the front insertion hole 224 and the elastic contact terminal 21 is correctly embedded. The elastic clip groove at the front end is locked, and finally overcomes the sliding friction of the anti-falling buckle 223, and is inserted into position and locked, so as to ensure that the board-end connector 2 is completely and effectively connected to the board-end male connector 1.

In the embodiment of the present invention, as shown in FIG. 11 , the elastic contact terminal 21 extends front and rear and is embedded in the embedding groove 227 , and interferes with the inner wall of the embedding groove 227 of the plastic body 22 of the connector at multiple points. The two-sided elastic contact is maintained in the insert groove 227, and the number of elastic contact points is not limited to ensure that the holding force of the elastic contact terminal 21 and the plastic body 22 is much greater than the contact force of the board-end male connector 1 and the board-end connector 2. Ensure and improve product reliability. The elastic contact terminal 21 is embedded in the groove 227 structure by pressing, and the shoulder part of the tail section of the elastic contact terminal 21 is flush with the rear end surface of the plastic body 22, and the distance between the tail ends of the two adjacent elastic contact terminals 21 is not less than 0.15 mm. After the front end of the board end male connector 1 and the front end of the board end connector 2 are inserted in place, the front end guide cone of the male socket terminal 11 is inserted into the elastic shrink wrap ring section along the front end necked socket of the elastic contact terminal 21 to maintain effective contact with the outer surface. The area is not less than 70%, and the contact surface impedance is not more than 0.05 ohms.

In the embodiment of the present invention, the bottom support bar 229 is used as a stand off structure, which can be designed according to the number of elastic contact terminals 21 . If the number of elastic contact terminals 21 is large, additional arrangements can be added in the middle of the rear bottom surface of the plastic body 22 along the front-rear direction. One or more bottom support strips 229 are used as a support structure for separating the bottom surface of the plastic body 22 from the surface of the PCB mounting position, so as to maintain sufficient installation space for the downwardly protruding tail end of the elastic contact terminal 21 .

In the embodiment of the present invention, the two grounding sheets 23 installed on the outer edges of the two sides of the plastic body 22 are used to fix the board-end connector 2 of the present invention on the PCB board. The corresponding quantity of the elastic contact terminals 21 and the inserting grooves 227 on the board-end connector 2 is set according to the needs, and the quantity is not limited. The design of the escape holes 221 on the plastic body 22 to prevent plastic shrinkage is not limited. Moreover, the front insertion hole 224 on the plastic body 22 is designed according to the number of the rear end pins of the elastic contact terminal 21 .

Claims (10)

1. The PC board end anti-loosening interference-free female connector is characterized in that a board end connector (2) comprises a plastic body (22) and a group of elastic contact terminals (21) arranged in the plastic body (22);

   at least one row of embedding grooves (227) which are parallel to each other are arranged in the plastic body (22) in parallel at intervals in the front-back direction, and the elastic contact terminals (21) are embedded in the embedding grooves (227);

   the embedded groove (227) is provided with a front inserting hole (224) at the upper opening of the front end surface of the plastic body (22);

   the elastic contact terminal (21) is connected into a whole by the bottom ribbon board from front to back, wherein the front end and two sides of the middle section of the elastic contact terminal (21) are bent upwards, the front end of the elastic contact terminal (21) is provided with a necking bell socket, the inner side of the necking bell socket is provided with an elastic shrinkage wrapping ring segment, and the rear section of the elastic contact terminal (21) is bent downwards and horizontally extends out of an opening of the caulking groove (227) on the rear end face of the plastic body (22) towards the rear end;

   the bottom side of the front part of the plastic body (22) is provided with a front bottom platform (226) higher than the bottom surface, two side edges of the front top surface of the plastic body (22) are respectively provided with at least one wrong insertion prevention plastic boss (222), the top surface of the front part of the plastic body (22) is provided with at least one anti-falling buckle (223), the rear part of the top surface of the plastic body (22) is provided with an upward convex rear top platform (225), and the outer walls of the two sides of the front part of the plastic body (22) are provided with two-stage guide edge edges (228) which are convex outwards and extend forwards.
2. 2. The PC board end anti-loosening and interference-free socket connector as claimed in claim 1, wherein the upper part of the anti-misplug plastic boss (222) is rectangular block-shaped, and the top of the anti-loosening buckle (223) is arc-shaped.
3. 3. The PC board end anti-loosening and interference-free socket connector as claimed in claim 1, wherein the top surface of the anti-misplugging plastic boss (222) is higher than the anti-loosening buckle (223).
4. 4. The PC board terminal anti-loosening and interference-free female connector as claimed in claim 1, wherein the inner wall of the front plug hole (224) has a tapered centering guide surface.
5. 5. The PC board terminal anti-loosening and interference-free female connector as claimed in claim 1, wherein at least one section of the edges of the two sides of the middle rear portion of the elastic contact terminal (21) is clamped into the inner wall of the embedding groove (227).
6. 6. The PC board end anti-loose and interference-free socket connector as claimed in claim 1, wherein the plastic body (22) is formed by at least two upper and lower mounting plates with a structure of a caulking groove (227) which are matched with each other, and the mounting plates are fixedly combined after the elastic contact terminals (21) are embedded.
7. 7. The PC board end anti-loosening and interference-free socket connector as claimed in claim 1, wherein the rear section of the second-step guiding edge (228) is more protruded than the front section and is stepped.
8. 8. The PC board terminal anti-loosening and interference-free socket connector as claimed in claim 1, wherein the outer wall of the middle rear part of the plastic body (22) symmetrically protrudes outward at the rear side of the second-order guide edge (228), and the front end face of the protruding part and the bottom face of the part are fixed with the angle-shaped grounding plate (23).
9. 9. The PC board end anti-loosening and interference-free female connector as claimed in claim 1, wherein the rear top platform (225) has a set of parallel-arranged tubular material-escaping holes (221) opening to the rear side.
10. 10. The socket connector of claim 1, wherein at least two bottom branches (229) are disposed in parallel on two side edges or a middle portion of the bottom surface of the back portion of the plastic body (22) along the front-back direction.

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