Connector sealing device, connector and connector sealing method

Abstract

The invention discloses a connector sealing device, a connector and a connector sealing method. The problems that in the prior art, a high-density and low-dwarf surface-mounted connector is difficult to seal and poor in manufacturability are solved. The connector sealing device comprises a press fitting tool and a sealing adhesive film, the sealing adhesive film is attached to a connector, and the press fitting tool is matched with the sealing adhesive film and the connector; and after being pressurized and heated by the press-fitting tool, the sealing adhesive film fills and seals the gap of the connector in a molten state and then is cured to form the sealing layer. The sealing adhesive film adopts a thermosetting high-temperature-resistant flexible hot melt adhesive film and is mounted on the mounting surface of the connector, and gaps are filled, sealed and cured after pressurization, heating and adhesive film melting; the flowability of the hot melt adhesive film, the accuracy of the press fitting tool and the rapid curing characteristic are combined, and the sealing reliability, the production efficiency and the cost control are superior to those of a traditional dispensing or encapsulating process.

Description

Technical Field

[0001] This invention relates to the field of miniature surface mount connector technology, and in particular to a connector sealing device, process, and corresponding connector. Background Technology

[0002] Currently, due to the demand for miniaturization, the node density of miniature surface-mount connectors is increasing. The contact pairs can only be open-type surface-mount contacts, using localized nickel-plated isolation areas to prevent solder from creeping into the contact area, which can meet the needs of industrial and consumer electronics applications. However, in special application environments, printed circuit board assemblies have requirements such as conformal coating and potting. Miniature surface-mount connectors with open structures pose a risk of conformal coatings and potting compounds flowing into the contact area.

[0003] Common surface-mount connector structures are as follows: 1. Round pin / round hole contact pairs, where the contact is forcibly mounted to the insulator or sealed with potting compound, such as the J30J series. Advantages: The contact uses a pin-type connector, forcibly mounted to the insulator and then fixed with potting compound, achieving a sealing of the mounting surface. The leads are bent and surface-mounted to the printed circuit board. A sealing gasket is installed at the mating end to achieve a sealing of the mating surface. Disadvantages: Round pin / round hole contact pairs are relatively large, making miniaturization impossible. 2. Open-type surface-mount contact pairs, where there is no seal between the contact and the insulator, such as the SAMTEC CLP series; the contact uses an open-type surface-mount contact, forcibly fixed to the insulator, with no sealing of the mounting surface. The leads are bent and surface-mounted to the printed circuit board. For this type of product structure, additional protection of the solder joints is required after soldering and before conformal coating. Current standard practices include: ① Masking the entire connector (including solder joints) before coating using tooling, masking tape, or spot-on peelable adhesive. The connector, including the pin solder joints, should not be coated with conformal paint. When coating, keep the area at least 2mm away from the connector perimeter. ② Applying silicone rubber to the pin solder joints for protection before coating. The drawback is that the connector itself lacks a sealed structure. Users must use masking tape or sealant to additionally seal the connector solder joints during conformal coating or potting, increasing the difficulty of use and compromising processability. Summary of the Invention

[0004] To address the shortcomings in the aforementioned background technology, this invention proposes a connector sealing device, a connector, and a connector sealing method, which solves the problems of difficult sealing and poor processability of high-density, low-profile surface-mount connectors in the prior art.

[0005] The technical solution of this invention is implemented as follows: A connector sealing device includes a pressing fixture and a sealing film. The sealing film is bonded to the connector, and the pressing fixture is adapted to both the sealing film and the connector. The sealing film, after being pressurized and heated by the pressing fixture, fills and seals the connector gap in a molten state, and then solidifies to form a sealing layer. This solution uses a thermosetting, high-temperature resistant, flexible hot melt adhesive film, installed on the connector mounting surface. Through pressurization and heating, the film melts and fills and seals the gap. It combines the fluidity of the hot melt adhesive film, the precision of the pressing fixture, and the rapid curing characteristics, resulting in superior sealing reliability, production efficiency, and cost control compared to traditional dispensing or potting processes.

[0006] Further preferably, the press-fit fixture includes a U-shaped base with a heating element inside; the bottom surface of the U-shaped base has several parallel guide grooves, each corresponding to a contact element of the connector; a pressing tooth is formed between two adjacent guide grooves, and a clearance groove is provided on the adhesive surface at the bottom of the pressing tooth. The press-fit fixture can use electric heating in conjunction with thermocouples for real-time temperature measurement to avoid local overheating and improve the precise control of the heating temperature.

[0007] Further optimized, the concave base has second positioning holes at both ends, which match positioning elements on the insulator of the connector. The press-fitting fixture, through the cooperation of the second positioning holes and the positioning elements, can achieve a quick and precise connection with the connector, ensuring uniform heat pressing of the sealing film.

[0008] Further preferably, the sealing film comprises a hot melt adhesive film and a PET film, with the PET film adhered to the upper surface of the hot melt adhesive film, which is a thermosetting adhesive film. The PET film serves two purposes: firstly, it provides support, preventing deformation of the adhesive film during cutting; secondly, it acts as an anti-adhesion agent, preventing the tooling from sticking to the hot melt adhesive film. The hot melt adhesive film, being a thermosetting film, softens and flows when heated to a molten state, achieving initial adhesion; continued heating and heat preservation trigger a chemical cross-linking reaction, transforming the film from a linear structure into a three-dimensional network structure; finally, it irreversibly cures, forming a high-strength, high-temperature-resistant adhesive sealing layer.

[0009] Further preferably, the sealing film has several sealing grooves on both sides and positioning holes at both ends, with the sealing grooves corresponding one-to-one with the contacts of the connector; this ensures that the contacts and insulator can be quickly filled and sealed after heating; the positioning holes match the positioning elements provided on the insulator of the connector; the sealing film achieves rapid positioning through the cooperation of the positioning holes and positioning elements.

[0010] Further preferably, the thickness of the hot melt adhesive film is 0.2~1mm, and the hot melt adhesive film and the PET film are set with equal length and width. Designing a suitable film thickness based on the gap between the mounting surfaces ensures that the film has appropriate fluidity, which can both fill the gap to achieve a seal and prevent adhesive leakage from affecting product performance.

[0011] Further optimization involves attaching the lower surface of the hot melt adhesive film to the mounting surface of the connector. After being pressurized and heated using a press-fitting fixture, the connector gap is filled, sealed, and cured to form a sealing layer. This sealing structure can be applied to the mounting surface sealing of various miniature surface-mount products, solving the problems of conformal coating creep and solder creep. With the addition of this sealing structure, no additional protective treatment is required, further improving connector manufacturing quality.

[0012] A connector sealing method using the above-mentioned connector sealing device includes the following steps: S1: Making a sealing film: bonding a PET film onto a hot melt adhesive film to form a composite film, opening sealing grooves on both sides of the composite film and opening positioning holes at both ends of the composite film to form a sealing film. S2: Pre-mounting: Adhere the sealing film from step S1 onto the connector so that the sealing groove matches the contact of the connector and the positioning hole matches the positioning element on the connector insulator. S3: Melt seal: The sealing film is pressed and heated to a molten state using a press-fitting tool. The molten hot melt film is then immersed into the gaps of the connector and solidified under the action of the press-fitting tool, thus sealing the entire connector. S4: Room temperature cooling: The press-fitting tooling stops heating, the sealing film cools at room temperature, and a high-strength and seamless sealing layer is formed on the connector; S5: Tooling Separation: Remove the press-fit tooling, then peel off the PET film on the surface of the sealing film to complete the sealing of the connector.

[0013] In step S1, the hot melt adhesive film is a thermosetting adhesive film. The hot melt adhesive film and the PET film are set to the same length and width, and the composite adhesive film is cut with a nano-laser to create sealing grooves and positioning holes.

[0014] In step S3, the hot melt adhesive film is pressed together with the press-fit tool and heated to a molten state. Then, it is kept at 190°C for 30 minutes to cure the hot melt adhesive film.

[0015] A connector is provided that is sealed using the aforementioned connector sealing method; this improves the connector's sealing performance, and is particularly suitable for connectors designed for miniaturization.

[0016] The beneficial effects of this invention are as follows: The sealing film of this invention adopts a thermosetting, high-temperature resistant, flexible hot melt adhesive film, which is installed on the connector mounting surface. After being pressed and heated, the adhesive film melts, filling and sealing the gap and curing it. It combines the fluidity of hot melt adhesive film, the precision of press-fitting tooling, and the rapid curing characteristics, and is superior to traditional dispensing or potting processes in terms of sealing reliability, production efficiency, and cost control. It solves the problems of difficult sealing and poor processability of high-density, low-profile surface-mount connectors in the prior art.

[0017] This invention relates to a thermosetting adhesive film. When heated to a molten state, the film softens and flows, achieving initial adhesion. Continued heating and heat preservation trigger a chemical cross-linking reaction, transforming the film from a linear structure into a three-dimensional network structure. Ultimately, it irreversibly cures, forming a high-strength, high-temperature resistant adhesive sealing layer. It can withstand temperatures above 200°C and does not soften or become tacky even after prolonged exposure to high temperatures. Furthermore, it exhibits high adhesive strength, with significantly improved peel strength and shear strength after curing. This enhances connector sealing performance and strengthens the connection between connector contacts (pins) and the insulator. This sealing structure can be applied to the mounting surface sealing of various miniature surface-mount products, solving the problems of conformal coating creep and solder slag creep. With this sealing structure, no additional protective treatment is required, further improving connector manufacturing quality.

[0018] The sealing film of this invention combines the "processability of hot melt adhesive" and the "high reliability of structural adhesive". Through cross-linking and curing, it achieves high temperature resistance, high strength and high flexibility sealing, making it an ideal choice for surface-mount connectors to achieve lightweight, high reliability and automated sealing in harsh environments. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the overall structure of the present invention; Figure 2 This is a partial schematic diagram of the overall assembly state of the present invention; Figure 3 This is a schematic diagram showing the bonding state between the sealant film and the connector. Figure 4 This is a schematic diagram of the press-fitting tooling structure of the present invention; Figure 5 This is a partial schematic diagram of the press-fitting tooling of the present invention; Figure 6 This is a partial schematic diagram of the sealing film of the present invention; Figure 7This is a cross-sectional schematic diagram of the overall assembled state of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] Example 1, as Figure 1 As shown, this invention discloses a connector sealing device, comprising a pressing fixture 1 and a sealing film 2. The sealing film 2 is bonded to a connector 3, and the pressing fixture 1 is adapted to both the sealing film 2 and the connector 3. After being pressurized and heated by the pressing fixture 1, the sealing film 2 fills and seals the gaps in the connector 3 in a molten state, and then solidifies to form a sealing layer. Due to the high-density (e.g., 0.5mm pitch) and low-profile (e.g., 3mm mating height) structural characteristics of micro-surface-mount products, the mounting surface has less than 1mm of space available for sealing structure design. In this embodiment, a sealing structure formed by a thermosetting sealing film can achieve a complete seal on the mounting surface of the micro-connector, improving sealing efficiency. Under high temperature and high pressure, the sealing film wets all gaps in the mounting surface, achieving a seal. Since the solid film does not contain organic solvents and has almost no fluidity, if the film is only melted and solidified at high temperature, it will not flow, cannot fill all gaps, and cannot achieve the sealing function (it can achieve the bonding function). Therefore, to achieve the sealing function, a fixture must be designed to apply a certain pressure to the film, increasing its fluidity.

[0024] Example 2, as Figure 2As shown, a connector sealing device includes a pressing fixture 1 and a sealing film 2. The sealing film 2 is bonded to a connector 3, and the pressing fixture 1 is adapted to both the sealing film 2 and the connector 3. After being pressurized and heated by the pressing fixture 1, the sealing film 2 fills and seals the gap in the connector 3 in a molten state, and then solidifies to form a sealing layer. Specifically, the sealing film 2 is a thermosetting, high-temperature resistant, flexible hot melt adhesive film, installed on the connector mounting surface. Through pressurization and heating, the film melts and fills and seals the gap. The thermosetting, high-temperature resistant, flexible hot melt adhesive film 2 has the characteristic of irreversible cross-linking and curing. After heating, it forms a three-dimensional network structure, with a high temperature resistance of over 200℃. It does not soften or become sticky after long-term exposure to high-temperature environments, and it also has high adhesive strength. After curing, the peel strength and shear strength are significantly improved, enhancing the connector's sealing performance and the connection between the connector contacts (pins) and the insulator.

[0025] like Figure 4 , 5 As shown, the pressing fixture 1 in this embodiment includes a U-shaped seat 101 for pressing onto the connector. In this embodiment, the U-shaped seat 101 is equipped with a heating element, which can be an electric heating plate. During pressing, it can rapidly heat the sealing film, and simultaneously, with real-time temperature measurement by a thermocouple, it avoids localized overheating and improves the precise control of the heating temperature. The bottom surface of the U-shaped seat 101 has several parallel guide grooves 102, each corresponding to a contact 31 of the connector 3. During operation, they interlock to avoid interference. A pressing tooth 103 is formed between two adjacent guide grooves 102, and a clearance groove 104 is provided on the adhesive-pressing surface at the bottom of the pressing tooth 103. The pressing tooth 103 presses the molten hot melt adhesive film into the gap between the contact and the insulator, while the clearance groove 104 prevents the molten adhesive film from overflowing outwards under the pressure of the pressing fixture, thus improving the sealing quality.

[0026] In this embodiment, the concave base 101 is provided with second positioning holes 105 at both ends. The second positioning holes 105 match the positioning members 33 provided on the insulator 32 of the connector 3. The positioning members can be positioning pins, which are fixed on both sides of the connector insulator. The insertion and engagement of the second positioning holes 105 with the positioning pins realizes the rapid positioning of the press-fit fixture and the connector, so that the guide groove 102 can be quickly inserted into the contact parts of the connector 3, thereby ensuring uniform heat pressing of the sealing film and improving the pressing accuracy and efficiency of the press-fit fixture.

[0027] Example 3, as Figure 3As shown, a connector sealing device includes a pressing fixture 1 and a sealing film 2. The sealing film 2 is bonded to a connector 3, and the pressing fixture 1 is adapted to both the sealing film 2 and the connector 3. After being pressurized and heated by the pressing fixture 1, the sealing film 2 fills and seals the gap in the connector 3 in a molten state, and then solidifies to form a sealing layer. In this embodiment, the sealing film 2 includes a hot melt adhesive film 21 and a PET film 22. The PET film 22 is adhered to the upper surface of the hot melt adhesive film 21, which is a thermosetting adhesive film. The PET film serves two purposes: firstly, it provides support to prevent deformation during cutting; secondly, it prevents adhesion between the fixture and the hot melt adhesive film. The hot melt adhesive film, being a thermosetting film, softens and flows when heated to a molten state, achieving initial adhesion. Continued heating and heat preservation trigger a chemical cross-linking reaction, transforming the film from a linear structure into a three-dimensional network structure. Finally, it irreversibly solidifies, forming a high-strength, high-temperature resistant adhesive sealing layer.

[0028] like Figure 6 , 7 As shown, in this embodiment, the sealing film 2 has several sealing grooves 23 on both sides, and positioning holes 24 at both ends. The sealing grooves 23 correspond one-to-one with the contacts 31 of the connector 3. The sealing grooves cooperate with the contacts to fill and seal the gap between the contacts and the insulator. The positioning holes 24 match the positioning elements 33 provided on the insulator 32 of the connector 3. The sealing film achieves rapid positioning through the cooperation of the positioning holes and positioning elements, ensuring that the gap between the contacts and the insulator can be quickly filled and sealed after heating. The film + press-fit process is easy to integrate into automated production lines, improving efficiency. The film can be pre-cut to reduce waste and lower overall costs.

[0029] In this embodiment, as a preferred solution, the thickness of the hot melt adhesive film 21 is 0.1~0.8mm. Designing a suitable film thickness based on the gap between the mounting surfaces ensures appropriate film flowability, allowing for sealing without leakage that could affect product performance. The hot melt adhesive film 21 and the PET film 22 are of equal length and width, ensuring a complete seal for the connector while reducing resource waste. In actual use, the lower surface of the hot melt adhesive film 21 is adhered to the mounting surface of the connector 3. After pressure and heating by the pressing fixture 1, the gap between the connector 3 is filled, sealed, and cured to form a sealing layer. This sealing structure can be applied to the sealing of mounting surfaces of various micro-surface-mount products, solving the problems of conformal coating creep and solder creep. With the added sealing structure, no additional protective treatment is required, further improving connector production quality. After curing, a dense layer is formed, providing waterproof, dustproof, and moisture-proof protection, meeting IP67 and higher protection levels. It is also resistant to high and low temperatures, anti-aging, and has high long-term reliability. It outperforms traditional dispensing or potting processes in terms of sealing reliability, production efficiency, and cost control.

[0030] In this embodiment, the pressing fixture 1 includes a U-shaped base 101 for pressing onto the connector. The U-shaped base 101 contains a heating element, which can be an electric heating plate. During pressing, it rapidly heats the sealing film, and, in conjunction with a thermocouple for real-time temperature measurement, prevents localized overheating and improves the precision of temperature control. The bottom surface of the U-shaped base 101 has several parallel guide grooves 102, each corresponding to a contact 31 of the connector 3. During operation, they interlock to prevent interference. A pressing tooth 103 is formed between adjacent guide grooves 102, and a clearance groove 104 is provided on the adhesive-pressing surface at the bottom of the pressing tooth 103. The pressing tooth 103 presses the molten hot melt adhesive film into the gap between the contact and the insulator, while the clearance groove 104 prevents the molten adhesive film from overflowing outwards under the pressure of the pressing fixture, thus improving the sealing quality.

[0031] In this embodiment, the concave base 101 is provided with second positioning holes 105 at both ends. The second positioning holes 105 match the positioning members 33 provided on the insulator 32 of the connector 3. The positioning members can be positioning pins, which are fixed on both sides of the connector insulator. The insertion and engagement of the second positioning holes 105 with the positioning pins realizes the rapid positioning of the press-fit fixture and the connector, so that the guide groove 102 can be quickly inserted into the contact parts of the connector 3, thereby ensuring uniform heat pressing of the sealing film and improving the pressing accuracy and efficiency of the press-fit fixture.

[0032] Example 4: A connector sealing method using the connector sealing device described in Example 3, with the following steps: S1: Fabricating a sealing film: A PET film is bonded to a hot melt adhesive film to form a composite film. Sealing grooves are formed on both sides of the composite film, and positioning holes are formed at both ends of the composite film to form a sealing film. The sealing film has a uniform thickness (preferably 0.1-0.3 mm) to avoid the problems of glue overflow and uneven thickness in traditional potting. The PET film serves two purposes: firstly, it provides support to prevent deformation of the film during cutting; secondly, it prevents adhesion between the tooling and the film.

[0033] S2: Pre-mounting: Apply the sealing film from step S1 to the mounting surface of the connector, ensuring that the sealing groove matches the connector contacts and the positioning hole matches the positioning element on the connector insulator. Specifically, apply the hot melt adhesive film to the mounting surface of the connector to ensure smooth mating between the sealing groove and the contacts.

[0034] S3: Melt Sealing: A pressure fitting fixture is used to press the sealing film and heat the hot melt adhesive film to a molten state. The molten hot melt adhesive film, under the pressure of the fixture, penetrates into the gaps of the connector and solidifies, sealing the entire connector. Under high temperature and pressure, the hot melt adhesive film wets all gaps on the mounting surface, achieving a seal. Since the solid adhesive film does not contain organic solvents and has almost no fluidity, if the film is only melted and solidified at high temperature, it will not flow and cannot fill the gaps, thus failing to achieve the sealing function (it can only achieve the bonding function). Therefore, to achieve the sealing function, a fixture must be designed to apply a certain pressure to the adhesive film, increasing its fluidity. In step S3, the pressure fitting fixture presses the adhesive film and heats it to a molten state, then holds it at 190℃ for 30 minutes to solidify the hot melt adhesive film. Rapid curing, with cross-linking completed within tens of seconds after heating and pressurization, shortens the cycle time and is suitable for automated production lines.

[0035] S4: Room Temperature Cooling: The pressing fixture stops heating, and the sealing film cools to room temperature, forming a high-strength and seamless sealing layer on the connector; ensuring sealing strength. In this embodiment, room temperature cooling allows the product to return to room temperature for easy handling.

[0036] S5: Tooling Separation: Remove the press-fit tooling, then peel off the PET film on the surface of the sealing film to complete the sealing of the connector.

[0037] It should be noted that the hot melt adhesive film in step S1 is a thermosetting adhesive film. The hot melt adhesive film and the PET film are set to the same length and width, and the composite adhesive film is cut with a nano-laser to create sealing grooves and positioning holes. The positioning holes and sealing grooves are cut with a nano-laser. During the cutting process, the adhesive film melts and deforms at the cut surface, and the actual cut size is larger than the size marked on the drawing. Therefore, a certain compensation size will be designed when designing the adhesive film size.

[0038] This process combines the fluidity of hot melt adhesive film, the precision of press-fitting fixtures, and rapid curing characteristics, resulting in superior sealing reliability, production efficiency, and cost control compared to traditional dispensing or potting processes. Thermosetting high-temperature resistant flexible hot melt adhesive film combines the processability of hot melt adhesive with the high reliability of structural adhesive. Through cross-linking and curing, it achieves high-temperature resistance, high strength, and high flexibility sealing, making it an ideal choice for surface-mount connectors to achieve lightweight, highly reliable, and automated sealing in harsh environments.

[0039] Example 5 describes a connector that uses the sealing method described in Example 4. This method improves connector sealing performance, making it particularly suitable for miniaturized connector designs. Addressing the high density (e.g., 0.5mm pitch) and low profile (e.g., 3mm mating height) characteristics of existing micro-surface mount products, a high-temperature flexible hot melt adhesive film is used. The film is applied to the connector mounting surface, and through pressure and heating using a tooling, the film melts and fills the gap, sealing it. The hot melt adhesive film is film-like, facilitating adhesion and preventing adhesive residue at the pin soldering locations. Furthermore, the film is solvent-free, has virtually no flowability, and eliminates the risk of adhesive creep. Its high-temperature resistance meets reflow soldering requirements. This sealing method can be applied to sealing the mounting surfaces of various micro-surface mount products, solving the problems of conformal coating creep and solder creep. With the added sealing structure, it can replace the original product in situ without altering the printed circuit board package size at the user's location, facilitating widespread application.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A connector sealing device, characterized in that: It includes a press fitting tool (1) and a sealing film (2). The sealing film (2) is bonded to the connector (3). The press fitting tool (1) is compatible with the sealing film (2) and the connector (3). After the sealing film (2) is pressurized and heated by the press fitting tool (1), it fills and seals the gap of the connector (3) in a molten state and then solidifies to form a sealing layer.

2. The connector sealing device according to claim 1, characterized in that: The press-fitting fixture (1) includes a U-shaped seat (101) with a heating element inside; the bottom surface of the U-shaped seat (101) is provided with a number of parallel guide grooves (102), and the guide grooves (102) correspond one-to-one with the contact elements (31) of the connector (3); a pressing tooth (103) is formed between two adjacent guide grooves (102), and a relief groove (104) is provided on the adhesive surface at the bottom of the pressing tooth (103).

3. The connector sealing device according to claim 2, characterized in that: The U-shaped base (101) has a second positioning hole (105) at both ends, which matches the positioning element (33) on the insulator (32) of the connector (3).

4. The connector sealing device according to any one of claims 1 to 3, characterized in that: The sealing film (2) includes a hot melt adhesive film (21) and a PET film (22). The PET film (22) is pasted on the upper surface of the hot melt adhesive film (21), and the hot melt adhesive film (21) is a thermosetting adhesive film.

5. The connector sealing device according to claim 4, characterized in that: The sealing film (2) has several sealing grooves (23) on both sides, and positioning holes (24) are opened at both ends of the sealing film (2). The sealing grooves (23) correspond one-to-one with the contact parts (31) of the connector (3). The positioning holes (24) match the positioning parts (33) provided on the insulator (32) of the connector (3).

6. The connector sealing device according to claim 5, characterized in that: The thickness of the hot melt adhesive film (21) is 0.2~1mm, and the hot melt adhesive film (21) and the PET film (22) are set with the same length and width.

7. The connector sealing device according to claim 5 or 6, characterized in that: The lower surface of the hot melt adhesive film (21) is pasted on the mounting surface of the connector (3). After being pressurized and heated by the press fitting fixture (1), the gap of the connector (3) is filled, sealed and cured to form a sealing layer.

8. A connector sealing method, characterized in that: The connector sealing device according to any one of claims 1 to 7 is as follows: S1: Making a sealing film: bonding a PET film onto a hot melt adhesive film to form a composite film, opening sealing grooves on both sides of the composite film and opening positioning holes at both ends of the composite film to form a sealing film. S2: Pre-mounting: Adhere the sealing film from step S1 onto the connector so that the sealing groove matches the contact of the connector and the positioning hole matches the positioning element on the connector insulator. S3: Melt seal: The sealing film is pressed and heated to a molten state using a press-fitting tool. The molten hot melt film is then immersed into the gaps of the connector and solidified under the action of the press-fitting tool, thus sealing the entire connector. S4: Room temperature cooling: The press-fitting tooling stops heating, the sealing film cools at room temperature, and a high-strength and seamless sealing layer is formed on the connector; S5: Tooling Separation: Remove the press-fit tooling, then peel off the PET film on the surface of the sealing film to complete the sealing of the connector.

9. The connector sealing method according to claim 8, characterized in that: In step S1, the hot melt adhesive film is a thermosetting adhesive film. The hot melt adhesive film and the PET film are set to the same length and width, and the composite adhesive film is cut with a nano-laser to create sealing grooves and positioning holes.

10. The connector sealing method according to claim 8 or 9, characterized in that: In step S3, the hot melt adhesive film is pressed together with the press-fit tool and heated to a molten state. Then, it is kept at 190°C for 30 minutes to cure the hot melt adhesive film.

11. A connector, characterized in that: The connector sealing method described in claim 10 is used for sealing.

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