Electric connector insulator detection method and electric connector insulator detection device

Abstract

The invention relates to the technical field of electric connector detection, and particularly discloses an electric connector insulator detection method and an electric connector insulator detection device.The electric connector insulator detection method comprises the steps that S10, the bottom end of a terminal jack of an insulator is plugged; s20, the terminal jacks are placed in the vertical direction; s30, injecting an injection molding material in a molten state into the terminal jack, and stopping injection molding until the upper surface of the injection molding material is flush with the top end of the terminal jack; s40, after the injection molding material in the terminal jack is solidified into an injection molding part, the injection molding part is taken out from the terminal jack; and S50, based on the appearance of the injection molded part, judging whether the terminal jack has defects or not. According to the electric connector insulator detection method, the injection molding part is formed in the terminal jack in an injection molding mode, the internal morphology of the terminal jack is transferred to the outer surface of the injection molding part, and therefore whether defects exist in the terminal jack of the insulator or not and whether the hidden danger of terminal pin shrinkage exists in the later period or not can be judged by observing and analyzing the outer surface of the injection molding part.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connector detection, and particularly to a method and a device for detecting an electrical connector insulator. Background Art

[0002] An electrical connector is a core component for realizing circuit interconnection in electronic devices. Its typical structure includes terminals and an insulator. The terminals are stamped from highly conductive metals (such as copper alloys, phosphor bronze) and serve as the core channels for current transmission. The surfaces are often gold-plated or tin-plated to enhance corrosion resistance and contact reliability. The insulator is injection-molded from a thermoplastic material, and a plurality of spaced-apart terminal holes are provided thereon. The terminals are inserted one by one into the corresponding terminal holes to isolate adjacent terminals, prevent short circuits, and support the spatial positioning of the terminals.

[0003] Pin shrinkage is a typical process defect in electrical connectors.

[0004] It is manifested as, after the terminals and the insulator are assembled, due to material shrinkage or stress release, the positions of the terminals are shifted, the dimensions are deformed, or the contact pressure is insufficient, resulting in an increase in contact resistance, unstable signal transmission, and a decrease in the insertion and extraction life. The main causes include:

[0005] When the insulator is injection-molded and cooled, the difference in thermal expansion coefficients between the plastic and the metal terminals (such as the plastic shrinkage rate > 0.5%, and the metal < 0.1%) causes interfacial stress, forcing the terminals to deform.

[0006] Improper control of the melt temperature, the holding pressure time, or the mold cooling rate results in residual stress inside the insulator, squeezing the terminal structure.

[0007] When installing the electrical connector, whether there are defects on the inner wall of the terminal hole of the insulator is related to the potential risk of pin shrinkage of the terminals. Since the size of the terminal jack is small, the internal morphology cannot be clearly observed by the human eye. The installation of electrical connectors is usually carried out in an assembly workshop or a repair workshop. These scenarios usually lack necessary precision observation instruments (such as CT scanning equipment, optical microscopes, etc.) to detect the terminal jacks of the insulators. Taking the electrical connector to the laboratory and using precision instruments for observation has the problem of long time consumption.

[0008] Therefore, there is an urgent need for a method that can be detected on-site during assembly to improve the efficiency of assembling or repairing electrical connectors. Summary of the Invention

[0009] The purpose of the present invention is to provide a method and a device for detecting an electrical connector insulator, so as to realize rapid detection of the terminal jacks of the electrical connector insulator at the assembly or repair site, and improve the efficiency of assembling or repairing electrical connectors.

[0010] On the one hand, the present invention provides a method for detecting an insulator of an electrical connector, which is used to detect the insulator of the electrical connector. The insulator is provided with terminal jacks, and the method includes:

[0011] S10: Block the bottom end of the terminal jack of the insulator;

[0012] S20: Place the terminal jack in the vertical direction;

[0013] S30: Inject molten injection material into the terminal jack, and stop injecting until the upper surface of the injection material is flush with the top end of the terminal jack;

[0014] S40: After the injection material in the terminal jack solidifies into an injection molded part, take out the injection molded part from the terminal jack;

[0015] S50: Based on the appearance of the injection molded part, determine whether there are defects in the terminal jack.

[0016] As a preferred technical solution of the method for detecting an insulator of an electrical connector, S10 includes blocking the bottom end of the terminal jack through a blocking member;

[0017] S30 further includes that before injecting the molten injection material into the terminal jack, an extrusion plate is arranged in the terminal jack, and the blocking member supports the extrusion plate;

[0018] During the process of injecting the molten injection material into the terminal jack, the molten injection material is injected between the blocking member and the extrusion plate, and the density of the extrusion plate is less than the density of the molten injection material.

[0019] As a preferred technical solution of the method for detecting an insulator of an electrical connector, S30 further includes: before the extrusion plate is arranged in the terminal jack, a release agent is coated on the extrusion plate and the inner wall of the terminal jack.

[0020] As a preferred technical solution of the method for detecting an insulator of an electrical connector, S30 further includes that during the process of injecting the molten injection material into the terminal jack, a preset pressure F is periodically applied to the extrusion plate, the preset pressure F is less than the buoyancy of the molten injection material, and the direction of the preset pressure F points to the blocking member.

[0021] As a preferred technical solution of the method for detecting an insulator of an electrical connector, S30 further includes heating the injection material to 60°C - 80°C to obtain the molten injection material.

[0022] As a preferred technical solution of the method for detecting the insulator of an electrical connector, in S40, the method for taking out the injection molded part from the terminal jack is as follows: push the extrusion plate downward so that the injection molded part and the plugging part protrude from the bottom end of the terminal jack in sequence.

[0023] On the other hand, the present invention provides an electrical connector insulator detection device, which adopts the electrical connector insulator detection method in any of the above solutions. The electrical connector insulator detection device includes a plugging part and a melting part. The plugging part is used to seal the bottom end of the terminal jack, and the melting part is used to heat the injection molding material.

[0024] As a preferred technical solution of the electrical connector insulator detection device, it further includes an extrusion plate. The extrusion plate is arranged in the terminal jack and located on the plugging part. A filling hole opposite to the plugging part is arranged on the extrusion plate, and the molten injection molding material is filled through the filling hole.

[0025] As a preferred technical solution of the electrical connector insulator detection device, the plugging part includes a plugging column and a sealing ring. The sealing ring is sleeved on the plugging column. The plugging column is configured to be inserted into the bottom end of the terminal jack so that the plugging column and the wall surface of the terminal jack clamp the sealing ring.

[0026] As a preferred technical solution of the electrical connector insulator detection device, the insulator includes a plurality of the terminal jacks. The plugging part further includes a bottom plate. A plurality of the plugging columns are provided, and a plurality of the sealing rings are provided. The plurality of plugging columns are fixedly arranged on the bottom plate, and the plurality of sealing rings are sleeved on the plurality of plugging columns one by one so that the plurality of plugging columns can be inserted into the bottom ends of the plurality of terminal jacks one by one;

[0027] A plurality of the extrusion plates are provided, and the plurality of extrusion plates are used to be arranged in the plurality of terminal jacks one by one.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention provides an electrical connector insulator detection method and an electrical connector insulator detection device. The electrical connector insulator detection method injects an injection molded part in the terminal jack through the electrical connector insulator detection device, and the internal morphology of the terminal jack is transferred to the outer surface of the injection molded part. Therefore, by observing and analyzing the outer surface of the injection molded part, it can be judged whether there are defects in the terminal jack of the insulator and whether there is a potential risk of terminal pin shrinkage in the later stage. Description of the Drawings

[0030] Figure 1 Flow chart of the electrical connector insulator detection method in the embodiment of the present invention Figure 1 ;

[0031] Figure 2 The flowchart of the method for detecting the insulator of the electrical connector in the embodiment of the present invention Figure 2 ;

[0032] Figure 3 Schematic diagrams of the steps of the method for detecting the insulator of the electrical connector in the embodiment of the present invention;

[0033] Figure 4 Schematic diagram of the structure of the plugging member in the embodiment of the present invention.

[0034] In the figure:

[0035] 100, insulator; 101, terminal jack; 1011, first jack; 1012, second jack;

[0036] 200, injection molded part;

[0037] 1, plugging member; 11, plugging column; 111, pit; 112, protrusion; 12, bottom plate;

[0038] 2, extrusion plate; 21, filling hole. Detailed implementation manners

[0039] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] The installation of the electrical connector is usually carried out in an assembly workshop or a maintenance workshop. These scenarios usually lack necessary precision observation instruments to detect the terminal jacks 101 of the insulator 100. Taking the electrical connector to a laboratory and using precision instruments for observation has the problem of long time consumption, and the human eye cannot directly observe. Therefore. As Figures 1 to 4 shown, the present embodiment provides a method for detecting an insulator of an electrical connector to realize the detection of the insulator 100 at the assembly site and improve the assembly efficiency of the electrical connector. The method for detecting the insulator of the electrical connector includes:

[0044] S10: Block the bottom end of the terminal jack 101 of the insulator 100.

[0045] In this step, the bottom end of the terminal jack 101 is blocked so that the terminal jack 101 becomes an injection molding cavity with one opening to prepare for S30.

[0046] Optionally, the bottom end of the terminal jack 101 is blocked by a blocking member 1.

[0047] S20: Place the terminal jack 101 in the vertical direction;

[0048] In this step, this setting allows the molten injection molding material to be injected from the top end of the terminal jack 101.

[0049] S30: Inject the molten injection molding material into the terminal jack 101 and stop injecting until the upper surface of the injection molding material is flush with the top end of the terminal jack 101.

[0050] The purpose of this step is to form the injection molded part 200 within the terminal jack 101. When the upper surface of the injection molding material is flush with the top end of the terminal jack 101, the terminal jack 101 is already filled with the molten injection molding material. Therefore, the injection of the injection molding material into the terminal jack 101 is stopped.

[0051] Optionally, S30 further includes: before injecting the molten injection molding material into the terminal jack 101, the extrusion plate 2 is disposed within the terminal jack 101, and the plug 1 supports the extrusion plate 2; during the process of injecting the molten injection molding material into the terminal jack 101, the molten injection molding material is injected between the plug 1 and the extrusion plate 2, and the density of the extrusion plate 2 is less than the density of the molten injection molding material. In this embodiment, when injecting the molten injection molding material between the plug 1 and the extrusion plate 2, as the injection molding material between the plug 1 and the extrusion plate 2 gradually increases, since the density of the extrusion plate 2 is less than that of the molten injection molding material, the extrusion plate 2 floats upward accordingly. During this process, on the one hand, the extrusion plate 2 can block the splashing of the molten injection molding material and avoid generating more bubbles. On the other hand, according to Laplace's law, the relationship between the internal pressure ρ 内 of the bubble and the external pressure ρ is: where γ is the surface tension of the solution and r is the radius of the bubble. When the external pressure ρ 外 increases, the bubble needs to shrink (r decreases) to maintain balance. When the bubble can no longer shrink, the bubble will gradually overflow. Therefore, the self - gravity of the extrusion plate 2 acts on the upper surface of the molten injection molding material, and the bubble can promote the gas to escape through the interface to maintain its own balance.

[0052] Optionally, S30 further includes that during the process of injecting the molten injection molding material into the terminal jack 101, a preset pressure F is periodically applied to the extrusion plate 2. The preset pressure F is less than the buoyancy of the molten injection molding material, and the direction of the preset pressure F points to the plug 1. In this embodiment, in order to further remove the bubbles in the molten injection molding material within the terminal jack 101, a periodic pressure is applied to the extrusion plate 2 (such as alternating pressurization / de - pressurization at a frequency of 0.1 Hz). By the periodic volume change of the injection molding material, the stable state of the bubbles is destroyed to promote the overflow of the bubbles. The preset pressure F is less than the buoyancy of the molten injection molding material, and this setting can prevent the extrusion plate 2 from being pressed into the molten injection molding material.

[0053] Optionally, S30 further includes heating the injection molding material to 60°C to 80°C to obtain a molten injection molding material. In this embodiment, since the insulator 100 is also an injection molded body, if the temperature of the molten injection molding material is higher than the tolerance temperature of the insulator 100, it will not only affect the accuracy of detection, but also may affect the insulator 100. According to statistics, the tolerance temperature of the existing insulator 100 material is usually greater than 150°C (for example, the rated temperature resistance range of polytetrafluoroethylene is 150°C–250°C, and the rated temperature resistance range of liquid crystal polymer is 200°C–300°C, etc.). Therefore, the melting point of the injection molding material selected in this application is 60°C–80°C to avoid affecting the insulator.

[0054] Optionally, the injection molding material has elasticity after solidification, and this setting can facilitate the demolding of the injection molded part 200.

[0055] Exemplarily, the injection molding material can be one of modified PE, TPE, TPR, and recycled mixed materials.

[0056] Optionally, S30 further includes: before the extrusion plate 2 is disposed in the terminal jack 101, a release agent is coated on the inner wall of the extrusion plate 2 and the terminal jack 101. In this step, when the molten injection molding material solidifies into an injection molded part, a release agent is coated on the inner wall of the extrusion plate 2 and the terminal jack 101, and this setting is beneficial to the separation of the injection molded part from the insulator 100 and the extrusion plate 2.

[0057] S40: After the injection molding material in the terminal jack 101 solidifies into an injection molded part 200, the injection molded part 200 is taken out.

[0058] Optionally, S40 further includes placing the insulator 100 in an environment of 10°C to 20°C.

[0059] In this embodiment, this setting is beneficial to the rapid solidification of the injection molding material. Generally, the temperature in the workshop can reach 10°C to 20°C. Therefore, during the solidification process of the injection molding material, there is no need to additionally set up temperature control equipment.

[0060] Optionally, in S40, the method for removing the injection molded part 200 from the terminal jack 101 is as follows: Push down the extrusion plate 2 so that the injection molded part 200 and the plugging member 1 extend out from the bottom end of the terminal jack 101 in sequence. In this embodiment, since the terminal jack 101 includes a first jack 1011 and a second jack 1012, the first jack 1011 and the second jack 1012 form a stepped hole, the top end of the terminal jack 101 is located at the first jack 1011, the bottom end of the terminal jack 101 is located at the second jack 1012, and the radial dimension of the first jack 1011 is smaller than that of the second jack 1012. If the injection molded part 200 is removed from the top end of the terminal jack 101, the stepped structure between the first jack 1011 and the second jack 1012 will block the injection molded part 200. If the injection molded part 200 is removed from the bottom end of the terminal jack 101, the terminal jack 101 will not interfere with the injection molded part 200. Therefore, by pushing the extrusion plate 2, the injection molded part 200 and the plugging member 1 are made to extend out of the terminal jack 101 together. Since the plugging member 1 is not coated with a release agent, the injection molded part 200 is directly fixed on the plugging member 1 to prevent the surface of the injection molded part 200 from being contaminated by the staff.

[0061] S50: Observe the surface topography of the injection molded part 200 to determine whether there are defects in the terminal jack 101.

[0062] In this step, by injecting the injection molded part 200, the inner surface of the terminal jack 101 is transferred to the outer surface of the injection molded part 200. The staff can directly observe with the naked eye to detect whether there are defects in the terminal jack 101.

[0063] This embodiment also provides an electrical connector insulator detection device, which adopts the electrical connector insulator detection method in the above solution. The electrical connector insulator detection device includes a melting member, a plugging member 1, and a pressing plate 2. The melting member is used to heat the injection molding material. The plugging member 1 is used to seal the bottom end of the terminal jack 101. The pressing plate 2 is disposed in the terminal jack 101 and on the plugging member 1. A filling hole 21 opposite to the plugging member 1 is provided on the pressing plate 2, and the molten injection molding material is filled through the filling hole 21. In this embodiment, the melting member can heat the solid injection molding material into a molten injection molding material. Specifically, the melting member is an electric heater. The molten injection molding material enters between the plugging member 1 and the pressing plate 2 through the filling hole 21. As the injection molding material is filled, the pressing plate 2 gradually approaches the top end of the terminal jack 101 until the upper surface of the injection molding material reaches the top end position of the terminal jack 101, and then the injection of the injection molding material into the terminal jack 101 is stopped. After the injection molding material in the terminal jack 101 solidifies to form an injection molded part 200, the injection molded part 200 is taken out, and by observing the morphology of the surface of the injection molded part 200, it can be further determined whether there are defects in the terminal jack 101. On the one hand, the pressing plate 2 can block the splashing of the molten injection molding material and avoid generating more bubbles. On the other hand, according to Laplace's law, the relationship between the internal pressure ρ 内 of the bubble and the external pressure ρ is: where γ is the surface tension of the solution, r is the radius of the bubble. When the external pressure ρ 外 increases, the bubble needs to shrink (r decreases) to maintain balance. When the bubble can no longer shrink, the bubble will gradually overflow. Therefore, the self-gravity of the pressing plate 2 acts on the upper surface of the molten injection molding material, and the bubble can promote the gas to escape through the interface to maintain its own balance.

[0064] Optionally, the plugging member 1 includes a plugging column 11 and a sealing ring. The sealing ring is sleeved on the plugging column 11. The plugging column 11 is configured to be inserted into the bottom end of the terminal jack 101 so that the plugging column 11 and the wall surface of the terminal jack 101 clamp the sealing ring. In this embodiment, the plugging column is inserted into the bottom end of the terminal jack 101, and the sealing ring seals the gap between the bottom end of the terminal jack 101 and the plugging column, thereby improving the sealing performance of the bottom end of the terminal jack 101.

[0065] Optionally, a concave pit 111 or a protrusion 112 is provided on the side of the plugging column 11 opposite to the pressing plate 2. In this embodiment, when a concave pit 111 is provided on the side of the plugging column 11 opposite to the pressing plate 2, the injection molded part 200 will extend into the concave pit 111, thereby improving the fixing stability between the plugging column 11 and the injection molded part 200. When a protrusion 112 is provided on the side of the plugging column 11 opposite to the pressing plate 2, the protrusion 112 will be inserted into the injection molded part 200, thereby improving the fixing stability between the plugging column 11 and the injection molded part 200.

[0066] Optionally, the insulator 100 includes a plurality of terminal jacks 101. The plugging member 1 further includes a bottom plate 12. There are a plurality of plugging columns 11 and a plurality of sealing rings. The plurality of plugging columns 11 are fixedly arranged on the bottom plate 12, and the plurality of sealing rings are sleeved on the plurality of plugging columns 11 one by one, so that the plurality of plugging columns 11 can be inserted into the bottom ends of the plurality of terminal jacks 101 one by one; there are a plurality of pressing plates 2, and the plurality of pressing plates 2 are used to be arranged in the plurality of terminal jacks 101 one by one. In this embodiment, since a plurality of terminal jacks 101 are usually arranged on the insulator 100, in order to further improve the efficiency of defect detection in the terminal jacks 101, and then enable the plurality of plugging columns 11 on the plugging member 1 to plug the bottom ends of the plurality of terminal jacks 101 on the insulator 100 at the same time, the plurality of pressing plates 2 are arranged in the plurality of terminal jacks 101 one by one, and then injection molding materials can be injected into the plurality of terminal jacks 101 at the same time. Furthermore, the detection efficiency of the insulator 100 can be improved.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for detecting an insulator of an electrical connector, which is used to detect the insulator (100) of the electrical connector, and the insulator (100) is provided with terminal jacks (101), characterized in that, Including: S10: Plug the bottom end of the terminal jack (101) of the insulator (100); S20: Place the terminal jack (101) in the vertical direction; S30: Inject molten injection molding material into the terminal jack (101), and stop injection when the upper surface of the injection molding material is flush with the top end of the terminal jack (101); S40: After the injection molding material in the terminal jack (101) solidifies into an injection molded part, take out the injection molded part from the terminal jack (101); S50: Based on the appearance of the injection molded part, determine whether there is a defect in the terminal jack (101).

2. The method for detecting an insulator of an electrical connector according to claim 1, wherein S10 includes plugging the bottom end of the terminal jack (101) through a plugging member (1); S30 further includes that before injecting the molten injection molding material into the terminal jack (101), a pressing plate (2) is arranged in the terminal jack (101), and the plugging member (1) supports the pressing plate (2); During the process of injecting the molten injection molding material into the terminal jack (101), the molten injection molding material is injected between the plugging member (1) and the pressing plate (2), and the density of the pressing plate (2) is less than the density of the molten injection molding material.

3. The method for detecting an electrical connector insulator according to claim 2, wherein, S30 further includes that before the pressing plate (2) is arranged in the terminal jack (101), a release agent is coated on the inner wall of the pressing plate (2) and the terminal jack (101).

4. The method for detecting an insulator of an electrical connector according to claim 2, wherein, S30 further includes that during the process of injecting the molten injection molding material into the terminal jack (101), a preset pressure F is periodically applied to the pressing plate (2), the preset pressure F is less than the buoyancy of the molten injection molding material, and the direction of the preset pressure F points to the plugging member (1).

5. The method for detecting an insulator of an electrical connector according to claim 1, wherein S30 further includes heating the injection molding material to 60°C - 80°C to obtain the molten injection molding material.

6. The method for detecting an insulator of an electrical connector according to claim 2, characterized in that, In S40, the method of taking out the injection molded part from the terminal jack (101) is: pushing down the pressing plate (2) so that the injection molded part and the plugging member (1) extend out from the bottom end of the terminal jack (101) in sequence.

7. Electric connector insulator detection device, characterized in that, Using the method for detecting an electrical connector insulator according to any one of claims 1 - 6, the electrical connector insulator detection device includes a plugging member (1) and a melting member, the plugging member (1) is used to seal the bottom end of the terminal jack (101), and the melting member is used to heat the injection molding material.

8. The electrical connector insulator detection device according to claim 7, characterized in that, It further includes a pressing plate (2), the pressing plate (2) is arranged in the terminal jack (101) and located on the plugging member (1), and a filling hole (21) opposite to the plugging member (1) is arranged on the pressing plate (2), and the molten injection molding material is filled through the filling hole (21).

9. The electrical connector insulator detection device according to claim 8, characterized in that The plugging member (1) includes a plugging column (11) and a sealing ring, the sealing ring is sleeved on the plugging column (11), and the plugging column (11) is configured to be inserted into the bottom end of the terminal jack (101) so that the plugging column (11) and the wall surface of the terminal jack (101) clamp the sealing ring.

10. The electrical connector insulator detection device according to claim 9, wherein The insulator (100) includes a plurality of the terminal jacks (101), the plugging member (1) further includes a bottom plate (12), a plurality of the plugging posts (11) are provided, a plurality of the sealing rings are provided, the plurality of the plugging posts (11) are fixedly arranged on the bottom plate (12), and the plurality of the sealing rings are sleeved on the plurality of the plugging posts (11) one by one, so that the plurality of the plugging posts (11) can be inserted into the bottoms of the plurality of the terminal jacks (101) one by one; A plurality of the pressing plates (2) are provided, and the plurality of the pressing plates (2) are used to be arranged in the plurality of the terminal jacks (101) one by one.

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