High-temperature-resistant concealed plug and manufacturing method thereof

Abstract

The invention discloses a high-temperature-resistant concealed plug, and the plug comprises a plug seat, and the front part of the plug seat is provided with a contact pin; the back surface of the plug seat is provided with a wiring part matched with the contact pin, and the wiring part is provided with an eccentric jack communicated with the contact pin; a threaded hole is formed in the side face of the eccentric insertion hole, and a locking screw is screwed into the threaded hole. The eccentric direction of the eccentric insertion hole is matched with the screwing-in direction of the locking screw rod, and thickening of the threaded hole is formed. The front part of the plug seat is provided with an inverted triangle groove used for identifying the pin. The connector assembly is composed of 75-85% of a BMC base body and 15-25% of glass fibers. The contact pin is a copper contact pin, and the surface of the contact pin is subjected to silver plating treatment; the high-temperature-resistant concealed plug solves the technical problems of high temperature resistance, corrosion resistance, plug connection stability, manufacturing and assembling precision and the like, improves the safety and reliability of the plug, prolongs the service life of the plug, and is particularly suitable for being applied to high-temperature and severe environments.

Description

Technical Field

[0001] The invention relates to a high temperature resistant concealed plug and a manufacturing method thereof. Background Art

[0002] As electrical equipment and electronic products develop towards high performance and high reliability, electrical connectors are increasingly used in modern industry, home appliances, automotive electronics and other fields. In these applications, plugs and sockets are important components of electrical connections, and their performance directly affects the stability, safety and durability of the equipment. However, the existing plug technology has certain defects and deficiencies in the following aspects, which urgently need to be improved.

[0003] Insufficient instantaneous high temperature resistance: During slag pouring in a smelter, the temperature of molten iron is 1350-1600°C, and the distance from the slag pit to the car is less than 5 meters. It needs to withstand a high temperature of about 500°C instantly. Second, in an instantaneous high temperature environment, traditional plug sockets are usually made of plastic or other thermoplastic materials, which are prone to deformation, aging or melting under instantaneous or short-term high temperatures, resulting in loose connections or poor contact between plugs and sockets.

[0004] The plug connection is not strong enough: In many plug designs on the market, the connection between the pin and the socket is relatively simple, mainly relying on plug-in contact, and lacking an effective locking device. In the case of frequent plugging and unplugging or vibration environment, this design is prone to poor contact, loose pins, and even electrical fires and other safety hazards. Therefore, how to ensure the long-term stability and reliability of the connection between the plug and the socket is still the focus of technical improvement.

[0005] Pin material and surface treatment issues: In existing plugs, many pins are made of copper, and the copper surface is prone to oxidation in high temperature, humid environments, resulting in reduced electrical contact performance, which in turn affects the conductivity and service life of the plug. Although some plugs are plated with gold or silver to improve conductivity and corrosion resistance, the existing plating process has problems such as unevenness and insufficient thickness, making it difficult to maintain excellent electrical performance for a long time.

[0006] Unclear markings and insertion directions: In existing plug designs, many products do not have clear markings or direction indicators, which makes it easy for users to insert or connect incorrectly during installation, causing the device to not work properly or even damage the plug or electrical equipment. This design defect is particularly prominent in high-frequency use or high-voltage electrical environments. Summary of the invention

[0007] The purpose of the present invention is to provide a high-temperature resistant concealed plug and a manufacturing method thereof, which solves multiple technical problems such as high temperature resistance, corrosion resistance, plug connection stability, and manufacturing and assembly accuracy, thereby improving the safety, reliability and service life of the plug, and is particularly suitable for applications in instantaneous high temperatures and harsh environments.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] A high temperature resistant concealed plug, comprising:

[0010] A plug socket, wherein a plug pin is arranged at the front of the plug socket;

[0011] The back of the plug socket is provided with a wiring part matched with the plug pin, and the wiring part is provided with an eccentric plug hole with rounded corners connected with the plug pin;

[0012] A threaded hole is provided on the side of the eccentric socket, and a locking screw is screwed into the threaded hole;

[0013] The eccentric direction of the eccentric socket matches the screwing direction of the locking screw and forms a thickening of the threaded hole;

[0014] An inverted triangle groove for marking the pins is provided at the front of the plug socket;

[0015] The plug base is composed of 75-85% BMC matrix and 15-25% glass fiber;

[0016] The pin is made of copper, and a thickened layer that can form a locking position is provided on the insertion side. The surface is silver-plated, and the outer diameter of the head of the pin is smaller than the outer diameter of the tail.

[0017] Another technical problem to be solved by the present invention is to provide a method for preparing a high temperature resistant concealed plug, comprising the following steps:

[0018] The pins are made of copper material and the surface of the pins is silver-plated;

[0019] Prepare 75-85% BMC matrix and 15-25% glass fiber, the ratio of BMC matrix to glass fiber is weight ratio;

[0020] After the BMC matrix and glass fiber are uniformly mixed, they are injection molded together with the pins to produce the plug socket;

[0021] An eccentric socket connected to the plug pin is processed on the wiring part of the plug socket, and a threaded hole is processed on the side of the eccentric socket. The threaded hole is used to install a locking screw, and the eccentric direction of the eccentric socket matches the screw-in direction of the locking screw to form a thickened structure of the threaded hole;

[0022] Screw the locking screw into the threaded hole so that it matches the direction of the eccentric socket;

[0023] The surface of the plug socket is sprayed and polished.

[0024] Preferably, the BMC matrix is ​​composed of epoxy resin, inorganic filler and additives, wherein the inorganic filler is one or more of quartz powder, talcum powder or silicate powder, and the additive is one or more of plasticizer, stabilizer or colorant.

[0025] Preferably, the pin is made of copper alloy material, and the surface is silver-plated to a thickness of 0.5 μm to 2 μm.

[0026] Preferably, the locking screw is made of high temperature resistant steel.

[0027] Preferably, the surface spray coating of the plug socket is a high temperature resistant coating.

[0028] Preferably, the plug socket is provided with an inverted triangular groove for marking the pins during molding.

[0029] Preferably, the plug socket is injection molded using vacuum injection molding technology.

[0030] The beneficial effects of the present invention are:

[0031] The plug uses a composite material of BMC (polymer-based composite material) and glass fiber as the main material of the plug socket. This material combination can significantly improve the stability and heat resistance of the plug in an instantaneous high temperature environment. The thermal stability of the BMC matrix and the reinforcement effect of the glass fiber help ensure that the plug will not deform or fail in a long-term high temperature environment; the wiring part of the plug socket is provided with an eccentric jack and a threaded hole for installing a locking screw. The matching design of the locking screw can ensure that the connection between the plug socket and the pin is firm and not easy to loosen, thereby improving the stability and safety of the electrical connection. The design of the eccentric jack prevents poor contact or poor contact when the plug is inserted.

[0032] The design of the eccentric jack makes the connection position and direction of the pin and the socket more precise. The design of the thickened structure of the threaded hole can improve the mechanical strength and locking effect of the socket, avoiding loosening or damage caused by frequent plugging and unplugging or external force; the pin is made of copper material and the surface is silver-plated, which solves the problem that copper is easily oxidized and corroded in high temperature and humid environments. The silver plating layer can not only improve the conductivity, but also enhance the corrosion resistance, thereby improving the reliability and life of the plug in long-term use; the front of the plug socket is provided with an inverted triangle groove for marking the pin, which is convenient for users to identify the front and back of the pin and the correct installation direction, simplifying the use process and avoiding poor contact or electrical failure caused by connecting in the wrong direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional diagram of a high temperature resistant concealed plug of the present invention;

[0034] Figure 2 It is a side view of a high temperature resistant concealed plug of the present invention;

[0035] Figure 3 This is a pin structure diagram of a high temperature resistant concealed plug of the present invention;

[0036] Figure 4 It is the state change diagram under high temperature conditions;

[0037] Figure 5 This is a state change diagram under extreme high temperature conditions;

[0038] Figure 6 This is a state change diagram of the existing plug under high temperature conditions. Specific implementation methods

[0040] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] See also Figure 1-3 As shown, a high temperature resistant concealed plug comprises:

[0044] A plug socket 1, wherein a plug pin 2 is provided at the front of the plug socket 1;

[0045] The back of the plug socket 1 is provided with a wiring portion 3 matched with the plug pin 2, and the wiring portion 3 is provided with an eccentric plug hole 4 with rounded corners connected with the plug pin 2;

[0046] A threaded hole 5 is provided on the side of the eccentric socket 4, and a locking screw 6 is screwed into the threaded hole 5;

[0047] The eccentric direction of the eccentric insertion hole 4 matches the screwing direction of the locking screw 6 and forms a thickening of the threaded hole;

[0048] The front part of the plug socket 1 is provided with an inverted triangular groove for marking the pins;

[0049] The plug socket 1 is composed of 75-85% BMC matrix and 15-25% glass fiber;

[0050] The pin 2 is a copper pin, and a thickened layer 21 is provided on the insertion side to form a clamping position, which is convenient for forming a clamping installation structure. The surface is silver-plated. The outer diameter of the head of the pin 2 is smaller than the outer diameter of the tail, thereby forming a variable diameter structure, which is convenient for pin withdrawal.

[0051] Example 1: Standard high temperature application plug

[0052] 1. Pin manufacturing and surface treatment

[0053] Material selection: Copper alloy (CuZn30, brass alloy) is used as the pin material, which has excellent conductivity and corrosion resistance.

[0054] Silver plating: The surface of the pin is silver-plated with a thickness of 1μm, which improves the conductivity and corrosion resistance of the pin and is suitable for long-term high temperature environments.

[0055] 2. Manufacturing of plug sockets

[0056] Matrix material: BMC matrix is ​​used, which is composed of 80% epoxy resin and 20% glass fiber, which enhances the strength and heat resistance of the plug socket. The inorganic filler uses quartz powder, and the additives are plasticizers and stabilizers.

[0057] Injection molding: The copper alloy pin and BMC matrix mixture is injection molded by vacuum injection molding technology to ensure that the finished product has excellent precision and stability.

[0058] 3. Processing of eccentric socket

[0059] Processing method: an eccentric socket connected to the pin is processed on the wiring part of the plug socket, a threaded hole is provided on the side of the eccentric socket, the threaded hole is used to install the locking screw 6, and its eccentric direction matches the screw-in direction of the locking screw 6, thereby enhancing the connection stability.

[0060] 4. Installation of locking screw 6

[0061] Material selection: The locking screw 6 is made of high temperature resistant steel, such as 304 stainless steel, to ensure that its strength and stability are maintained in a high temperature environment.

[0062] Locking structure: The locking screw 6 is screwed into the eccentric socket, and its direction matches the eccentric direction of the socket, forming a firm fixation.

[0063] 5. Surface treatment and marking

[0064] Surface spraying: The surface of the plug socket is sprayed with high temperature resistant paint, which has strong temperature resistance (high temperature resistance above 180℃).

[0065] Identification design: An inverted triangle groove 7 is reserved at the front of the plug socket to facilitate users to correctly identify the insertion direction of the plug.

[0066] 6. Typical applications

[0067] This embodiment is applicable to electrical connection equipment with an operating temperature in the range of 240° C. to 260° C., such as automotive electronic control systems, power equipment, etc.

[0068] Example 2: Industrial electrical appliance plug in high temperature environment

[0069] 1. Pin manufacturing and surface treatment

[0070] Material selection: Copper alloy (CuSn6) is used as the pin material, containing 6% tin, which has stronger corrosion resistance and high temperature resistance.

[0071] Silver plating: The pin surface is silver-plated with a thickness of 2μm, which enhances the conductivity and improves corrosion resistance, making it suitable for long-term high-temperature operation.

[0072] 2. Manufacturing of plug sockets

[0073] Matrix material: BMC matrix is ​​used, which is composed of 75% epoxy resin and 25% glass fiber, which enhances the strength and heat resistance of the material and adapts to more demanding working environments. Talc is used as inorganic filler to increase the high temperature resistance of the material.

[0074] Injection molding: Vacuum injection molding technology is used to ensure the stability and dimensional accuracy of the plug socket in a high temperature environment.

[0075] 3. Processing of eccentric socket

[0076] Processing method: Use precision CNC technology to process an eccentric jack connected to the pin on the wiring part of the plug socket, and process a threaded hole to ensure the installation accuracy of the locking screw 6 and prevent it from loosening due to high temperature and vibration.

[0077] 4. Installation of locking screw 6

[0078] Material selection: The locking screw 6 is made of high temperature resistant steel (such as Inconel 718 alloy), which has extremely strong high temperature resistance and is suitable for long-term use in high temperature and high pressure environments.

[0079] Locking structure: The locking screw 6 is screwed into the eccentric socket, and the thickened design of the threaded hole further enhances the locking effect to prevent the screw from loosening.

[0080] 5. Surface treatment and marking

[0081] Surface spraying: The surface of the plug socket is made of high temperature resistant paint with a temperature range of 250°C and can withstand long-term high temperature loads.

[0082] Identification design: An inverted triangle groove 7 is provided at the front of the plug socket to help the operator clearly identify the correct plug direction.

[0083] 6. Typical applications

[0084] This embodiment is suitable for industrial electrical connections with an operating temperature of 260° C. to 280° C., such as high-temperature industrial equipment, electrical control systems, etc.

[0085] Example 3: Aerospace plugs under extreme high temperature conditions

[0086] 1. Pin manufacturing and surface treatment

[0087] Material selection: Copper alloy (CuBe2) is used, which has high mechanical strength and good corrosion resistance and is suitable for extreme high temperature environments.

[0088] Silver plating: The surface of the pin is silver-plated with a thickness of 0.5μm to enhance conductivity and corrosion resistance and adapt to extreme high temperature environments.

[0089] 2. Manufacturing of plug sockets

[0090] Matrix material: BMC matrix is ​​used, which is composed of 85% epoxy resin and 15% glass fiber to strengthen the mechanical strength and thermal stability of the material. Inorganic filler uses silicate powder to improve thermal stability.

[0091] Injection molding: Vacuum injection molding technology is used to manufacture the plug socket to ensure high precision and high stability of the plug socket in aerospace environment.

[0092] 3. Processing of eccentric socket

[0093] Processing method: An eccentric socket connected to the pin is processed on the wiring part of the plug socket, and a precision threaded hole is processed on the side of the eccentric socket for installing the locking screw 6. The thickened structure of the threaded hole design ensures the firmness of the connection.

[0094] 4. Installation of locking screw 6

[0095] Material selection: The locking screw 6 is made of titanium alloy (Ti-6Al-4V), which has extremely strong high temperature resistance and corrosion resistance and is suitable for the aerospace field.

[0096] Locking structure: The locking screw 6 is screwed into the eccentric socket, and the eccentric socket matches the screw-in direction, which enhances the reliability of the plug connection and avoids loosening in a high temperature and vibration environment.

[0097] 5. Surface treatment and marking

[0098] Surface spraying: The surface of the plug socket is coated with high temperature resistant paint, which can withstand temperatures up to 350°C and can withstand the extreme high temperature environment of aerospace equipment.

[0099] Logo design: An inverted triangle groove 7 is reserved at the front of the plug socket to facilitate aviation engineering personnel to quickly and accurately connect at high speed.

[0100] 6. Typical applications

[0101] This embodiment is suitable for extreme high temperature conditions above 280°C, such as aerospace equipment, satellite electrical connection systems, etc.

[0102] Experimental example

[0103] In order to evaluate the performance difference between the above embodiment (i.e., the plug designed for high temperature applications) and the existing plug, a series of experimental comparisons can be performed. The following is a detailed description of an experimental design:

[0104] Purpose:

[0105] By comparing the performance of the high temperature resistant plug (Examples 1, 2, 3) with the existing plug under different working conditions, the superiority of the high temperature plug in terms of high temperature resistance, electrical conductivity, mechanical strength and long-term stability is evaluated.

[0106] Experimental Materials:

[0107] High temperature resistant plug:

[0108] Example 1: Standard high temperature application plug (operating temperature range: 240℃-260℃)

[0109] Example 2: Industrial electrical appliance plug (operating temperature range: 260°C-280°C)

[0110] Example 3: Aerospace plug (operating temperature range: 280°C and above)

[0111] Existing plugs:

[0112] Common plastic base plugs (such as PVC, ABS materials) or plugs that have not undergone special high-temperature treatment.

[0113] Experimental comparison projects and methods:

[0114] 1. High temperature tolerance test (instantaneous high temperature resistance performance)

[0115] Purpose: To verify the working stability and high temperature resistance of the plug in an instantaneous high temperature environment of 500℃, and to evaluate the instantaneous tolerance limit and thermal stability of the plug.

[0116] Test conditions:

[0117] The plug is subjected to an instantaneous high temperature resistance test of 500°C to simulate the plug's tolerance in an instantaneous high temperature environment.

[0118] Test method:

[0119] Experimental preparation:

[0120] Place the plugs to be tested (different models) in a high-temperature oven one by one.

[0121] Set up an instantaneous 500℃ high temperature environment and use hot air circulation equipment to ensure temperature uniformity.

[0122] Test steps:

[0123] The different plugs were exposed to an instantaneous high temperature environment of 500°C in sequence, with each exposure lasting for 30 seconds.

[0124] After each test cycle, quickly remove the plug, use a temperature sensor to measure its surface temperature, and observe the temperature changes of the plug.

[0125] Record the appearance of the plug, changes in shape, and plug-in and plug-out conditions, and observe whether there is any deformation, melting, cracking, or other damage.

[0126] Recording parameters:

[0127] The following data are recorded during each test cycle:

[0128] The plug is exposed to a maximum temperature change of 500°C.

[0129] Changes in the appearance of the plug (deformation, melting, cracking).

[0130] The plug-in and pull-out performance stability of the plug.

[0131] Record whether the plug fails or is damaged under 500°C instantaneous exposure conditions.

[0132] Observation results analysis:

[0133] Through data recording and appearance observation, the performance of different plug samples in an instantaneous 500°C environment was analyzed:

[0134] If the plug can maintain full functionality under instantaneous exposure conditions of 500°C and has no obvious physical deformation or damage, it indicates that the plug has good instantaneous high temperature resistance.

[0135] If the plug is melted, deformed or damaged, further analysis of the cause is required and improvements to the design are needed to enhance high temperature resistance.

[0136] Experimental conclusion:

[0137] like Figure 4-5 As shown, the plugs of Examples 1-3 should be able to maintain stability under instantaneous 500°C conditions without obvious deformation or damage.

[0138] like Figure 6 As shown, the existing plug is damaged under this transient temperature.

[0139] 2. Conductivity test (electrical performance)

[0140] Purpose: To evaluate the electrical conductivity of the plug at different temperatures and ensure the stable working state of the plug at high temperatures.

[0141] Test equipment: multimeter, current source, load resistor, current detector.

[0142] method:

[0143] The contact resistance of each plug was measured at room temperature (25°C) and high temperature environment (set temperature was 250°C, 270°C, 300°C).

[0144] Compare and test the changes in contact resistance at different temperatures to verify whether the conductive performance of the plug is stable at high temperatures.

[0145] Measure and record the rated current flow and voltage loss of the plug.

[0146] Test results:

[0147] The high temperature resistant plug should maintain stable conductivity at high temperature, with small change in contact resistance and be able to transmit current safely.

[0148] Due to factors such as material deformation, poor contact, oxidation or corrosion, existing plugs have increased contact resistance, increased current loss, and even short circuit.

[0149] 3. Mechanical strength and plug-in test (structural stability)

[0150] Purpose: To evaluate the mechanical strength and plug-in durability of the plug in a high temperature environment, and to verify whether it can work normally for a long time.

[0151] Testing equipment: tensile testing machine, plug insertion and extraction device, microscope.

[0152] method:

[0153] The plugging and pulling forces (including insertion and extraction forces) of the plug are tested at room temperature (25°C) and high temperature (set temperatures are 250°C, 270°C, and 300°C).

[0154] The plug is tested for 10,000 insertion and removal cycles to observe whether it is loose, cracked, detached or otherwise damaged.

[0155] Observe the contact surface between the socket and the pin under a microscope at high temperature to assess whether there is poor contact or damage caused by thermal expansion.

[0156] Test results:

[0157] High temperature resistant plugs should have high mechanical strength, the insertion and extraction force should not change much at high temperatures, and the contact surface should remain intact and stable.

[0158] The plugging and unplugging force of existing plugs will increase under high temperature conditions, and after long-term plugging and unplugging tests, the pins may become loose, the sockets may crack, and the surface of the sockets may be damaged.

[0159] 4. Long-term use stability test (thermal cycle test)

[0160] Purpose: To evaluate the stability and reliability of the plug in a long-term high-temperature and repeated working environment.

[0161] Test equipment: thermal cycler, thermostat, durability test platform.

[0162] method:

[0163] The plug was subjected to more than 1,000 thermal cycle tests (heating from room temperature to 250°C and then cooling back to room temperature, repeatedly).

[0164] After each cycle, the plug is tested for mechanical structure and electrical properties, and checked for morphological damage, increased contact resistance, or decreased conductivity.

[0165] Expected results:

[0166] The high temperature tolerant plug should maintain stable structural and electrical properties during multiple thermal cycle tests without obvious damage or performance degradation.

[0167] The plug is prone to structural fatigue, increased resistance, unstable electrical connection and other problems during the thermal cycle process, and cannot be used for a long time.

[0168] 5. Thermal stability and material testing (material changes)

[0169] Purpose: To evaluate the changes in plug materials under high temperature environment through microscopic analysis and thermal expansion test of materials.

[0170] Testing equipment: Scanning electron microscope (SEM), thermal expansion instrument, material hardness tester.

[0171] method:

[0172] Thermal expansion testing of high temperature resistant plugs and plug socket materials to measure the coefficient of thermal expansion.

[0173] The microstructure of the plug material is analyzed using a scanning electron microscope to see if the material deforms, cracks or oxidizes at high temperatures.

[0174] The surface hardness of the plug is tested to verify the wear resistance of the material.

[0175] Test results:

[0176] The material of the high temperature resistant plug should have a low thermal expansion coefficient, not easily deformed at high temperatures, and the surface of the material should remain intact without obvious cracks.

[0177] The materials of existing plugs will experience thermal expansion, surface cracks, oxidation and other phenomena at high temperatures, resulting in a decrease in plug performance.

[0178] Experimental results analysis:

[0179] High temperature resistant plug:

[0180] High temperature resistance: It can work stably for a long time in high temperature environment without deformation, melting or cracking.

[0181] Conductive performance: The contact resistance changes little at different temperatures and the current transmission is stable.

[0182] Mechanical strength: The plug-in and pull-out test is still smooth at high temperature, with no loose pins or poor contact.

[0183] Long-term use: After multiple thermal cycle tests, the plug performance is stable and there is no obvious decline.

[0184] Existing plugs:

[0185] High temperature resistance: It begins to deform and melt when the temperature exceeds 150℃, and is severely damaged when the temperature exceeds 200℃.

[0186] Conductive performance: In high temperature environment, contact resistance increases, current loss is obvious, and short circuit or electrical failure may occur.

[0187] Mechanical strength: At high temperatures, the plugging and unplugging forces increase, and the plug may become loose or fall off.

[0188] Long-term use: After the thermal cycle test, the plug cracks and ages and cannot work stably for a long time.

[0189] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A high temperature resistant concealed plug, characterized in that: include: A plug socket, wherein a plug pin is arranged at the front of the plug socket; The back of the plug socket is provided with a wiring part matched with the plug pin, and the wiring part is provided with an eccentric plug hole with rounded corners connected with the plug pin; A threaded hole is provided on the side of the eccentric socket, and a locking screw is screwed into the threaded hole; The eccentric direction of the eccentric socket matches the screwing direction of the locking screw and forms a thickening of the threaded hole; An inverted triangle groove for marking the pins is provided at the front of the plug socket; The plug base is composed of 75-85% BMC matrix and 15-25% glass fiber; The pin is made of copper, and a thickened layer that can form a locking position is provided on the insertion side. The surface is silver-plated, and the outer diameter of the head of the pin is smaller than the outer diameter of the tail.

2. A method for preparing a high temperature resistant concealed plug, characterized in that: The following steps are involved: The pins are made of copper material and the surface of the pins is silver-plated; Prepare 75-85% BMC matrix and 15-25% glass fiber, the ratio of BMC matrix to glass fiber is weight ratio; After the BMC matrix and glass fiber are uniformly mixed, they are injection molded together with the pins to produce the plug socket; An eccentric socket connected to the plug pin is processed on the wiring part of the plug socket, and a threaded hole is processed on the side of the eccentric socket. The threaded hole is used to install a locking screw, and the eccentric direction of the eccentric socket matches the screw-in direction of the locking screw to form a thickened structure of the threaded hole; Screw the locking screw into the threaded hole so that it matches the direction of the eccentric socket; The surface of the plug socket is sprayed and polished.

3. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The BMC matrix is ​​composed of epoxy resin, inorganic filler and auxiliary agent, wherein the inorganic filler is one or more of quartz powder, talcum powder or silicate powder, and the auxiliary agent is one or more of plasticizer, stabilizer or colorant.

4. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The pin is made of copper alloy material, and the surface is silver-plated to a thickness of 0.5 μm to 2 μm.

5. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The locking screw is made of high temperature resistant steel.

6. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The surface spray coating of the plug socket is a high temperature resistant coating.

7. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The plug socket is provided with an inverted triangular groove for marking the plug pins during molding.

8. The method for preparing a high temperature resistant concealed plug according to claim 2, characterized in that: The plug socket is injection molded by using vacuum injection molding technology.

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