An electrical connector coated with conductive paint

Abstract

The present invention belongs to the technical field of electrical connectors, and specifically is an electrical connector coated with a conductive coating, comprising a plug and a socket, wherein an insulating shell is fixedly connected to the end of the plug, a contact body is fixedly connected to the inner side of the insulating shell and at the end of the plug, the dustproof plate is fixedly connected to the end of the plug, a dust cover is arranged on the inner side of the end of the insulating shell, the outer cylindrical surface of the dust cover is fixedly connected to the inner end of a connecting rod, and a sponge block is arranged inside the dust cover; the present invention wipes the outer surface of the contact body by a sponge in an inner rotating block when the dust cover moves, thereby removing the erosion residue generated on the surface of the contact body when a large instantaneous current passes through; when the plug is separated from the socket, the movable ring is reset under the action of a reset spring, and at the same time, the movable ring drives the dust cover to reset through the connecting rod; when the plug is not working, the sponge wraps the contact body, thereby preventing the contact body from being contaminated by dust.

Description

Technical Field

[0001] The invention belongs to the technical field of electric connectors, in particular to an electric connector coated with conductive paint. Background Art

[0002] An electrical connector is an electromechanical component that connects electrical circuits. It consists of a fixed-end electrical connector, namely a female contact (referred to as a socket), and a free-end electrical connector, namely a male contact (referred to as a plug). The electrical connector consists of three basic units: a shell, an insulator, and a contact body. Due to the high quality and high reliability of the electrical connector, it is also widely used in military systems such as aviation, aerospace, and national defense. By coating the insulating shell of the electrical connector with conductive material, it has a protective effect to protect the signals of the terminals from interfering with each other. At the same time, dust or debris will enter the inside of the positive contact when it is in use, and when the contact body on the inside of the positive contact contacts the inside of the negative contact, the current will be relatively large when the circuit is just powered on, which can easily corrode the outer surface of the contact body on the inside of the positive contact. Dust and corrosion residues will affect the current flow between the electrical connectors.

[0003] There is also a patent in the prior art regarding a technical solution for an electrical connector. For example, a Chinese patent with application number 201821954957.X discloses a dust-proof packaging structure for a miniature medical electrical connector, the technical solution of which includes a base, a protective plate is fixedly installed at the edge of the top surface of the base, a protective cover is provided on the top of the surface of the protective plate through a sealing ring, limiting grooves are provided on both sides of the inner bottom of the protective cover, a pull rod is provided inside the limiting groove and inside the protective cover, a limiting block is provided on the surface of the pull rod, and the end of the limiting block away from the pull rod sequentially penetrates the sealing ring and the protective plate and extends to the inside of the protective plate, the pull rod is away from the limiting block One end of the protective cover passes through the protective cover and extends to the interior of the protective cover; in the above-mentioned patent, the micro medical electrical connector is fixed to the inside of the base by a clamping plate, and the electrical connector is packaged by pushing the pull rod until the limit block enters the interior of the protective plate, and the sealing ring between the protective cover and the protective plate strengthens the sealing of the package, thereby preventing dust or debris from entering the electrical connector. However, the above-mentioned patent still has defects. In the above-mentioned patent, the electrical connector is protected by a protective plate and a protective cover, and the protective plate occupies a large area, which makes the protective plate of the electrical connector unusable in some small space environments, and when the existing electrical connector male contact is taken out, the inside of the male contact is still contaminated by dust.

[0004] In view of this, the present invention solves the above technical problems by proposing an electrical connector coated with a conductive coating. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the problem that the prior art protects the electrical connector by means of a protective plate and a protective cover, the protective plate occupies a large area, resulting in the electrical connector being unable to be used in some small space environments, and the internal part of the male contact of the existing electrical connector is still contaminated by dust when the male contact is taken out, the present invention proposes an electrical connector coated with a conductive coating.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: an electrical connector coated with a conductive coating according to the present invention comprises a plug and a socket, the end of the plug is fixedly connected to an insulating shell, a slide groove is provided on the outside of the insulating shell, a contact body is fixedly connected to the inner side of the insulating shell and at the end of the plug, and the length of the slide groove is greater than the length of the contact body;

[0007] A dustproof plate is arranged at the end of the plug and is located outside the insulating shell, and the dustproof plate is fixedly connected to the end of the plug;

[0008] A movable ring is arranged between the insulating shell and the dustproof plate, and a reset spring is fixedly connected between the movable ring and the end of the plug, the movable ring is fixedly connected to the plug through the reset spring, and a connecting rod is fixedly connected to the inner side of the movable ring, and the diameter of the connecting rod is smaller than the width of the slide groove outside the insulating shell;

[0009] A dust cover is arranged on the inner side of the end of the insulating shell, the outer circular surface of the dust cover is fixedly connected to the inner end of the connecting rod, the outer surface of the dust cover is provided with an annular protrusion to achieve rapid positioning when the plug and the socket are connected, and a rotating block is provided inside the dust cover, and the rotating block corresponds to the position and number of the contact body one by one, and the dust cover cooperates with the dust plate to achieve dust protection of the contact body.

[0010] During operation, the insulating shell coated with conductive paint has a protective effect to protect the signals of the electrical connector from mutual interference. First, when the plug is connected to the socket, the end of the socket is wrapped by the circular protrusion on the outer surface of the dust cover, and then the plug is pushed to move, so that the reaction force of the end of the socket pushes the dust cover to move to the inside of the insulating shell. The circular protrusion allows the plug and the socket to be quickly positioned when connected, avoiding low connection efficiency due to dim external light when the plug and the socket are connected. At the same time, when the dust cover moves to the inside of the insulating shell, the dust cover drives the movable ring to move along the slide groove through the connecting rod and compresses the reset spring. At the same time, the sponge in the rotating block inside the dust cover wipes the outer surface of the contact body, clearing the burn marks on the surface of the contact body caused by the passage of large instantaneous current. The dust cover is not easily removed from the socket by the plug, and the dust is not easily removed from the socket by the plug. The dust cover is not easily removed from the socket, and the plug is not easily removed by the plug. The dust cover is not easily removed from the socket, and the plug is not easily removed by the plug. The dust cover is not easily removed from the socket, and the plug is not easily removed by the plug.

[0011] Preferably, a No. 1 ball is rotatably connected to the dust cover, and the No. 1 ball is located between the dust cover and the rotating block, and the No. 1 ball is used to realize the rapid rotation and disassembly of the rotating block. The rotating block is divided into two disconnected upper and lower parts, and a sponge is provided at the left end of the rotating block, and the upper and lower parts of the sponge are in close contact and completely wrap the left end of the contact body.

[0012] When working, the rotating block is divided into two disconnected upper and lower parts, and the sponge at the left end of the rotating block completely wraps the left end of the contact body to prevent external dust from entering the interior of the insulating shell. At the same time, when the rotating block moves, the sponge is compressed by the pressure of the contact body, so that the outer surface of the sponge is used to wipe the end of the contact body, avoiding the remaining corrosion residue on the end of the contact body. The No. 1 ball is stuck on the inner side of the dust cover. By moving the position of the No. 1 ball, the rotating block can be removed for cleaning, avoiding the presence of a large amount of corrosion residue in the sponge on the inner side of the rotating block, which affects the subsequent contact body cleaning effect.

[0013] Preferably, the upper and lower edges of the inner side of the rotating block are disconnected, and a No. 2 ball is rotatably connected to the end of the contact body. A spiral groove is opened on the outer side of the contact body, and the width of the spiral groove is adapted to the diameter of the No. 2 ball.

[0014] During operation, the No. 2 ball on the rotating block cooperates with the spiral groove, so that when the dust cover moves inward, the rotating block follows the spiral groove on the surface of the contact body under the action of the No. 2 ball on the inside, and rotates under the action of the No. 1 ball, so that the rotating block rotates and moves, thereby improving the cleaning effect of the outer surface of the contact body.

[0015] Preferably, an infusion port is provided at the outer end of the movable ring, and an infusion hose is provided inside the movable ring and the dust cover, and the inner side of the infusion hose is connected to the infusion port.

[0016] During operation, when a large instantaneous current flows through the surface of the contact body, corrosion may occur. By pouring some electric contact cleaner into the infusion port, the electric contact cleaner enters the infusion hose through the infusion port and is stored. At the same time, the electric contact cleaner is used to clean the corrosion residue on the surface of the contact body.

[0017] Preferably, a cam is rotatably connected to the inner side of the movable ring and inside the right side of the infusion hose, a groove corresponding to the outer diameter of the cam is provided on the outer side of the cam and at the end of the outer circular surface of the insulating shell, and a torsion spring is arranged on the inner side of the cam.

[0018] During operation, when the socket pushes the dust cover to move, the dust cover drives the movable ring to move through the connecting rod, so that the movable ring drives the cam inside to move and separate from the groove, so that the cam contacts the outer cylindrical surface of the insulating shell, so that the cam rotates toward the direction of the infusion hose under the friction force of the outer cylindrical surface of the insulating shell, so that the cam applies pressure to the infusion hose, accelerates the flow of the electrical contact cleaning agent in the infusion hose, and makes the electrical contact cleaning agent enter the infusion hose inside the dust cover, and then cooperates with the sponge on the inside of the rotating block to wipe the surface of the contact body, avoiding the electrical contact cleaning agent from being deposited on the bottom of the movable ring due to gravity. When the movable ring is reset and drives the cam to move above the groove, the cam does not contact the insulating shell under the action of the groove, so that the cam rotates and resets under the action of the inner torsion spring.

[0019] Preferably, a guide groove is provided above the No. 2 ball on the inner side of the rotating block, and the opening position of the guide groove corresponds to the position of the inner opening of the infusion hose inside the dust cover.

[0020] During operation, because the opening position of the flow groove corresponds to the position of the opening on the inner side of the infusion hose inside the dust cover, the electrical contact cleaning agent in the infusion hose inside the dust cover flows into the guide groove under the pressure of the cam, and then enters the sponge in the rotating block, so that the sponge with the electrical contact cleaning agent is used to clean the surface corrosion residue of the contact body, thereby improving the cleaning effect of the surface of the contact body, avoiding rust on the surface of the contact body, and avoiding poor contact when the contact body is in electric contact with the inside of the socket.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The electrical connector coated with a conductive coating described in the present invention wipes the outer surface of the contact body with a sponge in the inner rotating block when the dust cover moves, thereby removing the corrosion residue on the surface of the contact body caused by the passage of a large instantaneous current. When the plug is separated from the socket, the movable ring is reset under the action of the reset spring, and at the same time, the movable ring drives the dust cover to reset through the connecting rod, so that when the plug is not working, the rotating block completely wraps the end of the contact body with the sponge, protecting the contact body inside the insulating shell from dust pollution, avoiding the large footprint and small adaptability caused by the external protective plate in the prior art, and the inability to deal with the corrosion of the contact body.

[0023] 2. The electrical connector coated with a conductive coating described in the present invention injects some electrical contact cleaning agent into the infusion port so that the electrical contact cleaning agent enters the infusion hose through the infusion port. Since the opening position of the guide groove corresponds to the position of the inner opening of the infusion hose inside the dust cover, the electrical contact cleaning agent in the infusion hose inside the dust cover flows into the guide groove under the pressure of the cam, and then enters the rotating block, so that the rotating block is attached with the electrical contact cleaning agent to clean the surface corrosion residue of the contact body, thereby improving the cleaning effect of the contact body surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a stereogram of the structure of the present invention;

[0026] Figure 2 It is a front view schematic diagram of the plug in the present invention;

[0027] Figure 3 is a partial internal diagram of the plug of the present invention;

[0028] Figure 4 yes Figure 2 Partial cross-sectional view in the AA direction;

[0029] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 6 yes Figure 4 A partial enlarged view of point C in the middle.

[0031] In the figure: 1. plug; 11. insulating shell; 12. slide groove; 13. reset spring; 14. contact body; 15. spiral groove; 2. socket; 3. dust plate; 4. movable ring; 41. connecting rod; 42. infusion port; 43. infusion hose; 44. cam; 5. dust cover; 51. rotating block; 52. No. 1 ball; 53. No. 2 ball; 54. guide groove. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] like Figures 1 to 6 As shown, an electrical connector coated with a conductive coating according to the present invention comprises a plug 1 and a socket 2, wherein an end of the plug 1 is fixedly connected to an insulating shell 11, a slide groove 12 is provided on the outer side of the insulating shell 11, a contact body 14 is fixedly connected to the inner side of the insulating shell 11 and at the end of the plug 1, and the length of the slide groove 12 is greater than the length of the contact body 14;

[0034] A dustproof plate 3 is arranged at the end of the plug 1 and is located outside the insulating shell 11, and the dustproof plate 3 is fixedly connected to the end of the plug 1;

[0035] The movable ring 4 is arranged between the insulating shell 11 and the dustproof plate 3, and a reset spring 13 is fixedly connected between the movable ring 4 and the end of the plug 1. The movable ring 4 is fixedly connected to the plug 1 through the reset spring 13. The inner side of the movable ring 4 is fixedly connected to a connecting rod 41, and the diameter of the connecting rod 41 is smaller than the width of the slide groove 12 on the outer side of the insulating shell 11;

[0036] The dust cover 5 is arranged on the inner side of the end of the insulating shell 11, and the outer cylindrical surface of the dust cover 5 is fixedly connected to the inner end of the connecting rod 41. The outer surface of the dust cover 5 is provided with an annular protrusion to realize rapid positioning when the plug 1 and the socket 2 are connected. A rotating block 51 is provided inside the dust cover 5. The rotating block 51 corresponds to the position and number of the contact body 14 one by one. The dust cover 5 cooperates with the dust plate 3 to realize dust protection of the contact body 14.

[0037] During operation, the insulating shell 11 coated with a conductive coating has a protective effect to protect the signals of the electrical connector from mutual interference. First, when the plug 1 is connected to the socket 2, the end of the socket 2 is wrapped by the circular protrusion on the outer surface of the dust cover 5, and then the plug 1 is pushed to move, so that the reaction force of the end of the socket 2 pushes the dust cover 5 to move toward the inside of the insulating shell 11. The circular protrusion allows the plug 1 and the socket 2 to be quickly positioned when connected, avoiding low connection efficiency due to dim external light when the plug 1 and the socket 2 are connected. At the same time, when the dust cover 5 moves toward the inside of the insulating shell 11, the dust cover 5 drives the movable ring 4 to move along the slide groove 12 through the connecting rod 41, and compresses the reset spring 13. At the same time, the sponge in the rotating block 51 inside the dust cover 5 wipes the outer surface of the contact body 14, and removes the burns on the surface of the contact body 14 caused by the passage of a large instantaneous current. The dust cover 5 is not easily removed from the socket 2, and the dust is not easily removed from the socket 2. The dust cover 5 is not easily removed from the socket 2, and the dust is not easily removed from the socket 2. The dust cover 5 is not easily removed from the socket 2, and the dust is not easily removed from the socket 2. The dust cover 5 is not easily removed from the socket 2, and the dust is not easily removed from the socket 2. The dust cover 5 is not easily removed from the socket 2, and the dust is not easily removed from the socket 2. The dust is not easily removed from the socket 2, and the dust is not easily removed from the socket 2.

[0038] As a specific embodiment of the present invention, a No. 1 ball 52 is rotatably connected to the dust cover 5, and the No. 1 ball 52 is located between the dust cover 5 and the rotating block 51. The No. 1 ball 52 is used to realize the rapid rotation and disassembly of the rotating block 51. The rotating block 51 is divided into two disconnected upper and lower parts. A sponge is provided at the left end of the rotating block 51, and the upper and lower parts of the sponge are in close contact and completely wrap the left end of the contact body 14.

[0039] During operation, the rotating block 51 is divided into two disconnected upper and lower parts, and the sponge at the left end of the rotating block 51 completely wraps the left end of the contact body 14 to prevent external dust from entering the interior of the insulating shell 11. At the same time, when the rotating block 51 moves, the sponge is compressed by the pressure of the contact body 14, so that the outer surface of the sponge is used to wipe the end of the contact body 14, avoiding the remaining corrosion residue at the end of the contact body 14. The No. 1 ball 52 is stuck on the inner side of the dust cover 5. By moving the position of the No. 1 ball 52, the rotating block 51 can be removed for cleaning, avoiding the presence of a large amount of corrosion residue in the sponge on the inner side of the rotating block 51, which affects the later cleaning effect of the contact body 14.

[0040] As a specific embodiment of the present invention, the upper and lower edges of the inner side of the rotating block 51 are disconnected, and a No. 2 ball 53 is rotatably connected to the end of the contact body 14. A spiral groove 15 is opened on the outer side of the contact body 14, and the width of the spiral groove 15 is adapted to the diameter of the No. 2 ball 53.

[0041] During operation, the No. 2 ball 53 on the rotating block 51 cooperates with the spiral groove 15, so that when the dust cover 5 moves inward, the rotating block 51 follows the spiral groove 15 on the surface of the contact body 14 under the action of the No. 2 ball 53 on the inside, and rotates under the action of the No. 1 ball 52, so that the rotating block 51 rotates and moves, thereby improving the cleaning effect of the outer surface of the contact body 14.

[0042] As a specific embodiment of the present invention, an infusion port 42 is provided at the outer end of the movable ring 4 , and an infusion hose 43 is provided inside the movable ring 4 and the dust cover 5 , and the inner side of the infusion hose 43 is connected to the infusion port 42 .

[0043] During operation, when a large instantaneous current flows through the surface of the contact body 14, corrosion may occur. By pouring some electrical contact cleaner into the infusion port 42, the electrical contact cleaner enters the infusion hose 43 through the infusion port 42 for storage. At the same time, the electrical contact cleaner is used to clean the corrosion residue on the surface of the contact body 14.

[0044] As a specific embodiment of the present invention, a cam 44 is rotatably connected to the inner side of the movable ring 4 and inside the right side of the infusion hose 43, and a groove corresponding to the outer diameter of the cam 44 is provided on the outer side of the cam 44 and at the end of the outer circular surface of the insulating shell 11, and a torsion spring is arranged on the inner side of the cam 44.

[0045] During operation, when the socket 2 pushes the dust cover 5 to move, the dust cover 5 drives the movable ring 4 to move through the connecting rod 41, so that the movable ring 4 drives the cam 44 inside to move and separate from the groove, so that the cam 44 contacts the outer cylindrical surface of the insulating shell 11, so that the cam 44 rotates toward the direction of the infusion hose 43 under the action of the friction force of the outer cylindrical surface of the insulating shell 11, so that the cam 44 applies pressure to the infusion hose 43, accelerates the flow of the electrical contact cleaning agent in the infusion hose 43, and makes the electrical contact cleaning agent enter the infusion hose 43 inside the dust cover 5, and then cooperates with the sponge on the inside of the rotating block 51 to wipe the surface of the contact body 14, so as to avoid the electrical contact cleaning agent from being deposited on the bottom of the movable ring 4 due to gravity. When the movable ring 4 is reset and drives the cam 44 to move above the groove, the cam 44 does not contact the insulating shell 11 under the action of the groove, so that the cam 44 rotates and resets under the action of the inner torsion spring.

[0046] As a specific embodiment of the present invention, a guide groove 54 is opened above the No. 2 ball 53 inside the rotating block 51, and the opening position of the guide groove 54 corresponds to the position of the inner opening of the infusion hose 43 inside the dust cover 5.

[0047] During operation, because the opening position of the flow groove 54 corresponds to the position of the inner opening of the infusion hose 43 inside the dust cover 5, the electrical contact cleaning agent in the infusion hose 43 inside the dust cover 5 flows into the guide groove 54 under the pressure of the cam 44, and then enters the sponge in the rotating block 51, so that the sponge with the electrical contact cleaning agent is used to clean the surface corrosion residue of the contact body 14, thereby improving the cleaning effect of the surface of the contact body 14, avoiding rust on the surface of the contact body 14, and avoiding poor contact when the contact body 14 is in electric contact with the inside of the socket 2.

[0048] The specific workflow is as follows:

[0049] When the plug 1 is connected to the socket 2, the circular protrusion on the outer surface of the dust cover 5 wraps the end of the socket 2, and then pushes the plug 1 to move, so that the reaction force of the end of the socket 2 pushes the dust cover 5 to move toward the inside of the insulating shell 11. The circular protrusion enables the plug 1 and the socket 2 to be quickly positioned when connected. At the same time, when the dust cover 5 moves toward the inside of the insulating shell 11, the dust cover 5 drives the movable ring 4 to move along the slide groove 12 through the connecting rod 41 and compresses the reset spring 13. At the same time, when the dust cover 5 moves inward, the rotating block 51 follows the spiral groove 15 on the surface of the contact body 14 under the action of the inner No. 2 ball 53 and rotates under the action of the No. 1 ball 52. At the same time, the rotating block 51 moves with the dust cover 5, so that the sponge inside the rotating block 51 rotates and moves to wipe the outer surface of the contact body 14. At the same time, when the rotating block 51 moves, the sponge is affected by the contact body 14. The pressure is compressed, and the inner surface of the sponge is used to wipe the end of the contact body 14, thereby removing the erosion residue on the surface of the contact body 14 caused by the passage of a large instantaneous current, and ensuring that the contact body 14 will not have poor contact. When the socket 2 pushes the dust cover 5 to move, the dust cover 5 drives the movable ring 4 to move through the connecting rod 41, so that the movable ring 4 drives the inner cam 44 to move and separate from the groove, so that the cam 44 contacts the outer cylindrical surface of the insulating shell 11, so that the cam 44 rotates toward the direction of the infusion hose 43 under the friction force of the outer cylindrical surface of the insulating shell 11, so that the cam 44 applies pressure to the infusion hose 43, accelerates the flow of the electrical contact cleaning agent in the infusion hose 43, and makes the electrical contact cleaning agent enter the infusion hose 43 inside the dust cover 5, and then cooperates with the sponge on the inside of the rotating block 51 to wipe the surface of the contact body 14.

[0050] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electrical connector coated with a conductive coating, comprising a plug (1) and a socket (2), characterized in that: The end of the plug (1) is fixedly connected to an insulating shell (11), the outer side of the insulating shell (11) is provided with a slide groove (12), the inner side of the insulating shell (11) and the end of the plug (1) are fixedly connected to a contact body (14), the length of the slide groove (12) is greater than the length of the contact body (14); a dustproof plate (3) is arranged at the end of the plug (1) and is located on the outer side of the insulating shell (11), the dustproof plate (3) is fixedly connected to the end of the plug (1); a movable ring (4) is arranged between the insulating shell (11) and the dustproof plate (3), and a reset spring (13) is fixedly connected between the movable ring (4) and the end of the plug (1), and the movable ring (4) is connected to the plug (1) through the reset spring (13). 1) fixed connection, the inner side of the movable ring (4) is fixedly connected with a connecting rod (41), the diameter of the connecting rod (41) is smaller than the width of the slide groove (12) on the outer side of the insulating shell (11); a dust cover (5) is arranged on the inner side of the end of the insulating shell (11), the outer cylindrical surface of the dust cover (5) is fixedly connected with the inner end of the connecting rod (41), the outer surface of the dust cover (5) is provided with a circular ring protrusion for realizing rapid positioning when the plug (1) and the socket (2) are connected, the interior of the dust cover (5) is provided with a rotating block (51), the position and number of the rotating block (51) and the contact body (14) are in one-to-one correspondence, and the dust cover (5) cooperates with the dust plate (3) to realize dustproof of the contact body (14); A first ball (52) is rotatably connected to the dust cover (5), and the first ball (52) is located between the dust cover (5) and the rotating block (51). The first ball (52) is used to realize the rapid rotation and disassembly of the rotating block (51). The rotating block (51) is divided into two disconnected upper and lower parts. A sponge is provided at the left end of the rotating block (51), and the upper and lower parts of the sponge are in close contact and completely wrap the left end of the contact body (14); A second ball (53) is rotatably connected to the upper and lower edges of the inner side of the rotating block (51) and the outer side of the end of the contact body (14); a spiral groove (15) is provided on the outer side of the contact body (14); and the width of the spiral groove (15) is adapted to the diameter of the second ball (53); The outer end of the movable ring (4) is provided with an infusion port (42), and the inside of the movable ring (4) and the dust cover (5) are both provided with an infusion hose (43), and the inner side of the infusion hose (43) is communicated with the infusion port (42); A cam (44) is rotatably connected to the inside of the movable ring (4) and inside the right side of the infusion hose (43); a groove corresponding to the outer diameter of the cam (44) is provided on the outside of the cam (44) and at the end of the outer circumferential surface of the insulating shell (11); and a torsion spring is provided on the inside of the cam (44); A guide groove (54) is provided above the No. 2 ball (53) inside the rotating block (51), and the opening position of the guide groove (54) corresponds to the position of the inner opening of the infusion hose (43) inside the dust cover (5).

Images