Threaded fixed adapter
By using the screw-fixed adapter design, the external thread of the housing, the first boss and the nut are matched, combined with the annular buffer ring and double sealing elements, which solves the problems of loose connection and poor sealing of traditional adapters, and achieves a stable connection and efficient sealing, which is suitable for various equipment interface conversion scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN TIANMU ELECTRONIC CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional adapters suffer from problems such as loose connections, poor sealing, susceptibility to external impacts leading to unstable signal transmission, high production costs, and low assembly efficiency.
It adopts a screw-fixed structure, which forms a stable connection through the cooperation of the external thread of the housing, the first boss and the nut, combined with the annular buffer ring and double sealing elements. It is also equipped with a cover and modular design to enhance vibration resistance and sealing performance.
It improves the stability and vibration resistance of the connection, prevents loosening and falling off, reduces production costs, is suitable for harsh environments, extends service life, and supports flexible adaptation of multiple interfaces.
Smart Images
Figure CN224204544U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of adapter technology, and in particular discloses a screw-fixed adapter. Background Technology
[0002] In the field of modern electronic equipment, adapters are key components for signal transmission and device connection between different interfaces, and their structural stability and functional reliability are of paramount importance. Traditional adapters mostly use plug-in connections or single thread fixation, which have problems such as loose connections and poor sealing. They are susceptible to external impacts and environmental factors, leading to unstable signal transmission and even equipment damage. Although some adapters have sealed structures, the way the sealing components fit with the housing and internal components is complex, resulting in high production costs and low assembly efficiency. Utility Model Content
[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a screw-fixed adapter.
[0004] To achieve the above objectives, this utility model provides a screw-fit fixed adapter, comprising a housing, an adapter assembly disposed inside the housing, and a locking assembly disposed on the housing. The two ends of the adapter assembly are respectively a first electrical connector and a second electrical connector that are plugged into and connected to an external electrical connector. The housing is provided with an external thread. The locking assembly includes a first boss protruding from the outside of the housing and a nut that cooperates with the first boss and is screwed onto the outside of the external thread. The nut moves axially along the external thread of the housing. The nut rotates towards the end closer to the first boss, and together with the first boss, clamps the external assembly to achieve a fixed connection between the housing and the external assembly.
[0005] This screw-on fixed adapter achieves a stable connection with external components through the mating structure of the housing's external thread, the first boss, and the nut. Its advantages include higher vibration resistance and stability compared to traditional plug-in connections, effectively preventing loosening and detachment. The nut's rotational clamping method facilitates quick assembly and disassembly and reuse. In specific implementation, the housing is made of metal with machined external threads, the first boss is integrally formed with the housing, and the nut's internal thread precisely matches the housing's external thread. By controlling the number of rotations of the nut, the clamping force on the external component can be adjusted, ensuring a firm connection while avoiding overtightening that could damage the component. It is suitable for interface conversion scenarios of various devices.
[0006] The locking assembly also includes an annular buffer ring sleeved on the outside of the external thread, the annular buffer ring (7) being located between the first boss and the nut.
[0007] When the nut and the first boss clamp the external component, the annular buffer ring is compressed and undergoes elastic deformation, filling the gap at the connection. The buffering effect provided by the sealing ring reduces the rigid contact between the nut and the external component, preventing scratches on the surface of the external component during clamping and enhancing the stability and safety of the connection. The annular buffer ring is made of silicone rubber material that is resistant to aging and extreme temperatures.
[0008] The adapter also includes a cover, which includes a first body and a first cover that is flexibly connected to the first body. The inner sidewall of the first body has a first annular groove. The cover is fitted onto the first protrusion of the housing body through the first annular groove. The first cover and the first body are snapped together to cover the electrical connector on the housing.
[0009] The cover, through the tight fit between the first annular groove and the first protrusion, forms a secondary protective barrier against external dust and liquids, making it particularly suitable for industrial or outdoor equipment connections in harsh environments. When the adapter is not connected to external components, the cover can prevent foreign objects from being accidentally inserted into the interface, protecting the internal circuitry from damage.
[0010] The adapter assembly includes a circuit connection unit, a first electrical connector and a second electrical connector respectively connected to both ends of the circuit connection unit; a receiving cavity is opened inside the housing, the first electrical connector is located inside one end of the receiving cavity and exposed in the receiving cavity, and the second electrical connector is located at the other end of the receiving cavity and protrudes out of the housing.
[0011] The modular design makes the circuit connection unit and electrical connector easy to install, replace and maintain, effectively reducing maintenance costs; the accommodating cavity provides physical protection and electromagnetic shielding space for internal components, improving signal transmission stability; the prominent design of the electrical connector facilitates quick docking with external devices, enhancing practicality.
[0012] A connecting line is provided between the circuit connection unit and the second electrical connector, and one end of the connecting line protruding from the housing is electrically connected to the second electrical connector.
[0013] The flexible cable design breaks the rigid connection limitation between the circuit connection unit and the second electrical connector, allowing the second electrical connector to be flexibly adjusted in position and angle within a certain range to adapt to different installation spaces and external device interface layouts, thus enhancing the adapter's versatility. Simultaneously, the flexible cable effectively buffers stress caused by external insertion / removal or vibration, preventing direct impact on solder joints, reducing circuit failures due to stress concentration, and extending the adapter's lifespan. Furthermore, different specifications of cable can be selected according to signal transmission requirements, specifically optimizing signal transmission performance and improving signal integrity.
[0014] The adapter also includes a first sealing element injection molded inside the housing. The housing and the adapter assembly together hold the first sealing element. The inner side of the housing is also provided with a second annular groove. The first sealing element includes a second body covering the adapter assembly and a second protrusion protruding from the second body. The second protrusion abuts against the second annular groove.
[0015] The first sealing element is integrally molded with the housing using injection molding, which allows it to fit tightly against the adapter assembly, effectively blocking the penetration path of impurities such as liquids and dust, and ensuring stable operation of the adapter in harsh environments such as high humidity and dust. The interference fit between the second boss and the second annular groove not only enhances the sealing effect but also provides additional mechanical support for the internal components, preventing the electrical connector from loosening or shifting during insertion and removal, and extending the service life of the adapter. At the same time, the injection molding process ensures that there are no gaps between the sealing element and the housing, avoiding sealing failure due to long-term use.
[0016] The adapter further includes a second sealing element disposed between the connecting wire and the housing. The second sealing element includes a third body injection molded on the outside of the connecting wire, a stop portion integrally formed on the top of the third body, and a stop panel provided on the inner side wall of the housing to stop the opening of the receiving cavity. The stop panel has a plug interface communicating with the receiving cavity, which facilitates the connection between the second sealing element and the circuit connection unit. The stop portion of the second sealing element abuts against the stop panel of the housing for sealing.
[0017] The third body tightly wraps around the connecting wire, blocking the path of liquid penetration along the cable; the stop part and the stop panel are in surface contact and sealed, forming a second barrier. The injection molding process makes the third body and the connecting wire form an integrated structure, effectively dispersing the tensile force generated during insertion and removal, and reducing the risk of fatigue fracture of the solder joint.
[0018] Both the first and second electrical connectors are provided with protective shells on their outer sides, and one end of the protective shell is fixedly mounted on the circuit connection unit.
[0019] The protective shell can effectively resist external mechanical impacts and collisions, prevent electrical connectors from being damaged by external forces, and extend the service life of the adapter.
[0020] The outer side of the shell is also provided with a frosted texture layer that is evenly distributed along the circumference of the shell.
[0021] The frosted texture layer significantly increases the friction on the shell surface, providing a more secure grip when rotating the nut for installation or removal, effectively preventing slippage and operational errors. Simultaneously, the frosted texture enhances the product's appearance and tactile experience, elevating its quality and premium feel. The frosted texture layer is formed on the outer surface of the shell using a sandblasting process, employing alumina abrasive particles with a particle size of 80-120 mesh, and a sandblasting pressure controlled at 0.4-0.6 MPa to ensure uniform texture and appropriate depth, achieving a surface roughness of Ra3.2-6.3 μm. The frosted texture layer extends along... The shell is evenly distributed circumferentially, with its axial length set at 10-15mm according to the shell size. A 2-3mm gap is maintained between the shell and the lower end face of the external thread to avoid affecting the normal use of the thread. After sandblasting, the shell is cleaned and dried. Then, a 0.02-0.05mm thick layer of transparent UV paint is applied to the surface of the frosted texture layer through a spraying process to enhance wear resistance and stain resistance while maintaining the frosted texture. Finally, a curing treatment is performed at a curing temperature of 80-100℃ for 15-20 minutes to allow the UV paint to fully cure and form a strong protective film.
[0022] The first and second electrical connectors can be Type-C, HDMI, or USB interfaces.
[0023] In practical applications, the first and second electrical connectors can be flexibly configured as Type-C, HDMI, or USB interfaces depending on the usage scenario and device requirements. When configured as a Type-C interface, it can be adapted to devices such as smartphones and laptops that support this interface, enabling high-speed data transmission and fast charging. If an HDMI interface is used, it can be used for signal transmission between high-definition audio-visual devices, meeting the connection needs of home theaters, projectors, and other devices. The USB interface, with its wide compatibility, is suitable for connecting various data storage devices and peripheral accessories.
[0024] Figure 9 In another embodiment of this utility model, the adapter does not have a connecting wire, and the second electrical connector is directly connected to the circuit connection unit.
[0025] The protective shell integrates a magnetic attraction module, which is composed of a ring-shaped neodymium iron boron magnet. This module is used to attract and align with the metal contacts of external devices, reducing the risk of misalignment during insertion and removal.
[0026] The beneficial effects of this utility model are as follows: Based on the mechanical clamping of the outer thread of the shell with the first boss and nut, combined with the elastic deformation sealing of the annular buffer ring and double sealing elements, and the protective barrier of the cover, a three-dimensional protection system of physical connection and waterproof and dustproof is formed; the internal modular adapter components and flexible connecting wires ensure stable signal transmission and flexible structural adaptation. Compared with traditional adapters, this design significantly improves connection stability and vibration resistance, preventing loosening and falling off; the multi-seal structure achieves a high protection level, suitable for harsh environments; the modular design facilitates maintenance and reduces costs, while the flexible connection enhances versatility and extends service life; the protective shell protects the interface from external damage, and the frosted texture optimizes the user experience; at the same time, it supports multiple mainstream interfaces such as Type-C, HDMI, and USB, meeting the diverse needs of devices in different scenarios for high-speed data transmission and audio-visual output. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0028] Figure 2 This is an exploded view of the entire utility model;
[0029] Figure 3 This is a schematic diagram of the cover assembly structure of this utility model;
[0030] Figure 4 This is a schematic diagram of the structure of the first sealing element of this utility model;
[0031] Figure 5 This is a schematic diagram of the structure of the shell of this utility model;
[0032] Figure 6 This is a cross-sectional view of the housing of this utility model;
[0033] Figure 7 This is a schematic diagram of the structure of the second sealing element of this utility model;
[0034] Figure 8 This is a schematic diagram of the structure of the adapter component of this utility model;
[0035] Figure 9 This is a schematic diagram of another embodiment of the present invention.
[0036] The reference numerals in the figures include:
[0037] 1. Housing; 2. Adapter assembly; 3. Locking assembly; 4. External thread; 5. First boss; 6. Nut; 7. Annular buffer ring; 8. Cover assembly; 9. First body; 11. First cover; 12. First annular groove; 13. Circuit connection unit; 14. First electrical connector; 15. Second electrical connector; 16. Connecting wire; 17. First sealing element; 18. Second annular groove; 19. Second body; 21. Second boss; 22. Second sealing element; 23. Third body; 24. Stop; 25. Stop panel; 26. Plug interface; 27. Protective shell; 28. Frosted texture layer. Detailed Implementation
[0038] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.
[0039] Please see Figures 1 to 9 As shown, this utility model discloses a screw-fixed adapter, including a housing 1, an adapter component 2 disposed inside the housing 1, and a locking component 3 disposed on the housing 1. The two ends of the adapter component 2 are respectively a first electrical connector 14 and a second electrical connector 15 that are plugged into and connected to external electrical connectors. The housing 1 is provided with an external thread 4. The locking component 3 includes a first boss 5 protruding from the outside of the housing 1 and a nut 6 that cooperates with the first boss 5 and is screwed onto the outside of the external thread 4. The nut 6 moves axially along the external thread 4 of the housing 1. The nut 6 rotates towards the end close to the first boss 5, and together with the first boss 5, clamps the external component to achieve a fixed connection between the housing 1 and the external component.
[0040] This screw-fixed adapter achieves a stable connection with external components through the mating structure of the external thread 4 of the housing 1, the first boss 5, and the nut 6. Its advantages are that compared with the traditional plug-in connection, it has higher vibration resistance and stability, effectively preventing loosening and falling off. Moreover, the rotation clamping method of the nut 6 facilitates quick disassembly and reusability. In a specific implementation, the housing 1 is made of metal with the external thread 4 machined on it. The first boss 5 is integrally formed with the housing 1. The internal thread of the nut 6 is precisely matched with the external thread 4 of the housing 1. By controlling the number of rotations of the nut 6, the clamping force on the external components can be adjusted to ensure a firm connection while avoiding excessive tightness that could damage the components. It is suitable for interface conversion scenarios of various devices.
[0041] The locking assembly 3 also includes an annular buffer ring 7 sleeved on the outside of the external thread 4, the annular buffer ring 7 (7) being located between the first boss 5 and the nut 6.
[0042] When the nut 6 and the first boss 5 clamp the external component, the annular buffer ring 7 is compressed and undergoes elastic deformation, filling the gap at the connection. The buffering effect provided by the sealing ring reduces the rigid contact between the nut 6 and the external component, preventing scratches on the surface of the external component during clamping and enhancing the stability and safety of the connection. The annular buffer ring 7 is made of silicone rubber material that is resistant to aging and high and low temperatures.
[0043] The adapter also includes a cover 8, which includes a first body 9 and a first cover 11 flexibly connected to the first body 9. The inner side wall of the first body 9 is provided with a first annular groove 12. The cover 8 is sleeved onto the first boss 5 of the housing 1 body through the first annular groove 12. The first cover 11 and the first body 9 are snapped together to cover the electrical connector on the housing 1.
[0044] The cover 8 forms a secondary protective barrier against external dust and liquid through the tight fit between the first annular groove 12 and the first protrusion 5, making it particularly suitable for industrial or outdoor equipment connections in harsh environments. When the adapter is not connected to external components, the cover 8 can prevent foreign objects from being accidentally inserted into the interface and protect the internal circuitry from damage.
[0045] The adapter assembly 2 includes a circuit connection unit 13, a first electrical connector 14 and a second electrical connector 15 respectively connected to both ends of the circuit connection unit 13; a receiving cavity is opened inside the housing 1, the first electrical connector 14 is located inside one end of the receiving cavity and exposed in the receiving cavity, and the second electrical connector 15 is located at the other end of the receiving cavity and protrudes out of the housing 1.
[0046] The modular design makes the circuit connection unit 13 and the electrical connector easy to install, replace and maintain, effectively reducing maintenance costs; the accommodating cavity provides physical protection and electromagnetic shielding space for internal components, improving signal transmission stability; the prominent design of the electrical connector facilitates quick docking with external devices, enhancing practicality.
[0047] A connecting line 16 is provided between the circuit connection unit 13 and the second electrical connector 15. One end of the connecting line 16 protrudes from the housing 1 and is electrically connected to the second electrical connector 15.
[0048] The connection cable 16 breaks the rigid connection limitation between the circuit connection unit 13 and the second electrical connector 15, allowing the second electrical connector 15 to be flexibly adjusted in position and angle within a certain range to adapt to different installation spaces and external device interface layouts, thus enhancing the versatility of the adapter. At the same time, the flexible connection cable 16 can effectively buffer the stress caused by external plugging or vibration, avoiding direct action on the solder joints, reducing circuit failures caused by stress concentration, and extending the service life of the adapter. In addition, different specifications of connection cables 16 can be selected according to signal transmission requirements to optimize signal transmission performance and improve signal integrity.
[0049] The adapter also includes a first sealing element 17 injection molded in the housing 1. The housing 1 and the adapter assembly 2 together hold the first sealing element 17. The inner side of the housing 1 is also provided with a second annular groove 18. The first sealing element 17 includes a second body 19 covering the adapter assembly 2 and a second boss 21 protruding from the second body 19. The second boss 21 abuts against the second annular groove 18.
[0050] The first sealing element 17 is integrally molded with the housing 1 using injection molding, which can tightly fit the adapter component 2, effectively blocking the penetration path of impurities such as liquids and dust, and ensuring stable operation of the adapter in harsh environments such as high humidity and dust. The interference fit between the second boss 21 and the second annular groove 18 not only enhances the sealing effect, but also provides additional mechanical support for the internal components, preventing the electrical connector from loosening or shifting during insertion and removal, and extending the service life of the adapter. At the same time, the injection molding process ensures that there is no gap between the sealing element and the housing 1, avoiding sealing failure due to long-term use.
[0051] The adapter also includes a second sealing element 22 disposed between the connecting line 16 and the housing 1. The second sealing element 22 includes a third body 23 injection molded on the outside of the connecting line 16, a stop portion 24 integrally formed on the top of the third body 23, and a stop panel 25 provided on the inner side wall of the housing 1 to stop the opening of the receiving cavity. The stop panel 25 has a plug interface 26 communicating with the receiving cavity. The plug interface 26 facilitates the connection between the second sealing element 22 and the circuit connection unit 13. The stop portion 24 of the second sealing element 22 abuts against the stop panel 25 of the housing 1 for sealing.
[0052] The third body 23 tightly wraps around the connecting line 16, blocking the path of liquid penetration along the cable; the stop part 24 and the stop panel 25 are in surface contact and sealed, forming a second barrier. The injection molding process makes the third body 23 and the connecting line 16 form an integrated structure, effectively dispersing the tensile force generated during insertion and removal, and reducing the risk of fatigue fracture of the solder joint.
[0053] The first electrical connector 14 and the second electrical connector 15 are both provided with protective shells 27 on their outer sides, and one end of the protective shell 27 is fixedly mounted on the circuit connection unit 13.
[0054] The protective housing 27 can effectively resist external mechanical impacts and collisions, prevent electrical connectors from being damaged by external forces, and extend the service life of the adapter.
[0055] The outer side of the housing 1 is also provided with a frosted texture layer 28 that is evenly distributed along the circumference of the housing 1.
[0056] The frosted texture layer 28 significantly increases the friction on the surface of the housing 1, providing a more secure grip when the user rotates the nut 6 for installation or removal, effectively preventing operational errors caused by slippage. Simultaneously, the frosted texture enhances the product's appearance and tactile experience, increasing its perceived quality and premium feel. The frosted texture layer 28 is formed on the outer surface of the housing 1 using a sandblasting process, employing alumina abrasive particles with a particle size of 80-120 mesh, and controlling the sandblasting pressure at 0.4-0.6 MPa to ensure uniform texture and appropriate depth, achieving a surface roughness of Ra. 3.2-6.3μm; The frosted texture layer 28 is evenly distributed along the circumference of the shell 1, and its axial length is set to 10-15mm according to the size of the shell 1. A gap of 2-3mm is maintained between the shell 1 and the lower end face of the external thread 4 to avoid affecting the normal use of the thread. After sandblasting, the shell 1 is cleaned and dried. Then, a layer of transparent UV paint with a thickness of 0.02-0.05mm is applied to the surface of the frosted texture layer 28 by spraying to enhance wear resistance and anti-fouling ability, while maintaining the frosted texture. Finally, a curing treatment is performed at a curing temperature of 80-100℃ for 15-20 minutes to fully cure the UV paint and form a strong protective film.
[0057] The first electrical connector 14 and the second electrical connector 15 can be a Type-C interface, an HDMI interface, or a USB interface.
[0058] In practical applications, the first electrical connector 14 and the second electrical connector 15 can be flexibly configured as Type-C, HDMI, or USB interfaces, depending on different usage scenarios and device requirements. When configured as a Type-C interface, it can be adapted to devices such as smartphones and laptops that support this interface, enabling high-speed data transmission and fast charging. If an HDMI interface is used, it can be used for signal transmission between high-definition audio-visual devices, meeting the connection needs of devices such as home theaters and projectors. The USB interface, with its wide compatibility, is suitable for connecting various data storage devices and peripheral accessories.
[0059] Figure 9 In another embodiment of the present invention, the adapter does not have a connecting line 16, and the second electrical connector 15 is directly connected to the circuit connection unit 13.
[0060] The protective shell 27 integrates a magnetic module, which is composed of a ring-shaped neodymium iron boron magnet. It is used to attract and align with the metal contacts of external devices, reducing the risk of insertion and removal misalignment.
[0061] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A screw-fit fixed adapter, characterized in that: The device includes a housing (1), an adapter assembly (2) disposed inside the housing (1), and a locking assembly (3) disposed on the housing (1). The two ends of the adapter assembly (2) are a first electrical connector (14) and a second electrical connector (15) that are connected to the external electrical connector. The housing (1) is provided with an external thread (4). The locking assembly (3) includes a first boss (5) protruding from the outside of the housing (1) and a nut (6) that is used in conjunction with the first boss (5) and screwed onto the outside of the external thread (4). The nut (6) moves axially along the external thread (4) of the housing (1). The nut (6) rotates toward the end closer to the first boss (5) and together with the first boss (5) clamps the external component to achieve a fixed connection between the housing (1) and the external component.
2. The screw-fit fixed adapter according to claim 1, characterized in that: The locking assembly (3) also includes an annular buffer ring (7) sleeved on the outside of the external thread (4), the annular buffer ring (7) being located between the first boss (5) and the nut (6).
3. The screw-fit adapter according to claim 1, characterized in that: The adapter also includes a cover (8), which includes a first body (9) and a first cover (11) flexibly connected to the first body (9). The inner sidewall of the first body (9) is provided with a first annular groove (12). The cover (8) is fitted onto the first boss (5) through the first annular groove (12). The first cover (11) and the first body (9) are snapped together to seal the electrical connector on the housing (1).
4. The screw-fit adapter according to claim 1, characterized in that: The adapter assembly (2) includes a circuit connection unit (13), a first electrical connector (14) and a second electrical connector (15) respectively connected to both ends of the circuit connection unit (13); a receiving cavity is opened inside the housing (1), the first electrical connector (14) is located inside one end of the receiving cavity and exposes the receiving cavity, and the second electrical connector (15) is located at the other end of the receiving cavity and protrudes out of the housing (1).
5. A screw-fit fixed adapter according to claim 4, characterized in that: A connecting line (16) is provided between the circuit connection unit (13) and the second electrical connector (15), and one end of the connecting line (16) protruding from the housing (1) is electrically connected to the second electrical connector (15).
6. A screw-fit fixed adapter according to claim 1, characterized in that: The adapter also includes a first sealing element (17) injection molded in the housing (1). The housing (1) and the adapter assembly (2) together hold the first sealing element (17). The inner side of the housing (1) is also provided with a second annular groove (18). The first sealing element (17) includes a second body (19) covering the adapter assembly (2) and a second boss (21) protruding from the second body (19). The second boss (21) abuts against the second annular groove (18).
7. A screw-fit fixed adapter according to claim 5, characterized in that: The adapter also includes a second sealing element (22) disposed between the connecting line (16) and the housing (1). The second sealing element (22) includes a third body (23) injection molded on the outside of the connecting line (16), a stop portion (24) integrally formed on the top of the third body (23), and a stop panel (25) provided on the inner side wall of the housing (1) to stop the opening of the receiving cavity. The stop panel (25) has a plug interface (26) communicating with the receiving cavity. The plug interface (26) facilitates the connection between the second sealing element (22) and the circuit connection unit (13). The stop portion (24) of the second sealing element (22) abuts against the stop panel (25) of the housing (1) for sealing.
8. A screw-fixed adapter according to claim 4, characterized in that: The first electrical connector (14) and the second electrical connector (15) are both provided with protective shells (27) on their outer sides, and one end of the protective shell (27) is fixedly mounted on the circuit connection unit (13).
9. A screw-fit fixed adapter according to claim 1, characterized in that: The outer side of the shell (1) is also provided with a frosted texture layer (28) that is evenly distributed along the circumference of the shell (1).
10. A screw-fit adapter according to claim 4, characterized in that: The first electrical connector (14) and the second electrical connector (15) can be a Type-C interface, an HDMI interface or a USB interface.