A relay terminal plug-in structure

Abstract

This invention provides a relay terminal plug-in structure, belonging to the technical field of relay equipment. It includes a relay body connected to a first wire, which in turn connects to a front terminal assembly, which in turn connects to a rear terminal assembly. It also includes: a cleaning assembly comprising a magnetic ring and a telescopic airbag; a plug-in assembly comprising a push ring and a terminal head connected to a telescopic spring; and a fire extinguishing assembly comprising a storage cylinder and a second telescopic airbag. The invention offers the following advantages: it prevents accidental loosening of the terminal head during use, ensuring stability; it reduces dust adhesion to the surface, ensuring smooth current flow; and when exposed to open flame, it sprays out the fire extinguishing dry powder from the storage cylinder, quickly dispersing it to ensure uniform spraying and extinguishing the fire at the connection point, effectively increasing coverage, improving fire extinguishing effect, and reducing property damage and personal injury.

Description

Technical Field

[0001] This invention relates to the field of relay equipment technology, and more specifically, to a relay terminal plug-in structure. Background Technology

[0002] A relay is an electrical control device. The control terminal of a relay can be connected to a control signal source, allowing external circuits to manipulate the relay's state through control current signals. This enables the relay to function as a switch, switching circuits remotely or automatically. Simultaneously, the presence of a relay provides isolation between circuits. When a control signal causes the relay to switch, the circuit at the load end and the circuit at the control end are electrically isolated. This helps prevent the propagation of interference or faults between the two circuits. The existence of relay terminals enables it to serve as a key component in electrical systems, enabling remote control, circuit isolation, protection, and automation functions. The connection structure of the relay terminals has a significant impact on its functional implementation.

[0003] When relay terminals are plugged in, some dust adheres to the terminal connection. When dust adheres to the surface of the relay terminals, it forms an additional dielectric layer between the two contacting metal surfaces. According to the principles of physics and electricity, this leads to an increase in contact resistance. Prolonged use may have a certain impact on electrical components. Secondly, when the relay carries a large current, the terminal area will generate a certain amount of heat. If the heat dissipation performance of the plug-in structure is poor, the heat cannot be dissipated in time, leading to excessively high terminal temperatures, accelerating terminal aging and oxidation, and even potentially damaging surrounding insulation materials. When there is an overload, abnormal connection, or relay failure, the relay terminals may overheat, which may even cause a fire hazard. If the fire is not detected and extinguished in time, it may cause even more serious losses. How to invent a relay terminal plug-in structure to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides a relay terminal plug-in structure, which aims to solve the problems that dust adhering to the terminal connection end will cause increased contact resistance, and that overheating of the relay terminal will cause a fire hazard, which may cause serious losses if the fire is not extinguished in time.

[0005] This invention is implemented as follows:

[0006] This invention provides a relay terminal plug-in structure, including a relay body, a first wire connected to the relay body, a front terminal assembly connected to the first wire, a rear terminal assembly connected to the front terminal assembly, and further comprising:

[0007] A cleaning assembly, which is connected to a rear terminal assembly, includes a magnetic ring and a telescopic airbag.

[0008] A plug-in assembly, which is connected to a front terminal assembly, includes a push ring and a terminal head, the terminal head being connected to a telescopic spring;

[0009] A fire extinguishing assembly, which is connected to a front terminal assembly, includes a storage cylinder and a telescopic airbag.

[0010] Preferably, the front terminal assembly includes a terminal block and a boss. One end of the terminal block is fixedly connected to a wire, and the other end of the terminal block is fixedly connected to the boss. The boss has a placement cavity inside, and the inner wall of the placement cavity has a plurality of circumferentially arranged limiting sliding holes.

[0011] Preferably, the end of the boss away from the terminal block has a plurality of movable holes arranged in a circumferential array, and the side wall of the boss has a through hole located inside the plurality of movable holes. Both the movable holes and the through hole are connected to the placement cavity.

[0012] Preferably, the second telescopic airbag is located inside the placement cavity, one end of the second telescopic airbag is fixedly connected to the inner wall of the placement cavity away from the through hole, and a one-way air inlet pipe is fixedly connected to the side wall of the second telescopic airbag, and the one-way air inlet pipe is connected to the boss.

[0013] Preferably, the telescopic airbag two has a one-way exhaust port at the end away from the one-way air inlet pipe, one end of the telescopic airbag two is fixedly connected to the storage cylinder, the storage cylinder is located on one side of the one-way exhaust port, the end of the storage cylinder away from the telescopic airbag two has a spray hole, and the outer wall of the storage cylinder is slidably connected to the inner wall of the through hole.

[0014] Preferably, the push ring is sleeved on the outside of the boss, and a magnetic ring is fixedly connected to the end of the push ring away from the terminal block. A plurality of support plates corresponding to the limiting sliding holes are fixedly connected to the inner ring of the push ring, and the support plates are slidably connected to the limiting sliding holes.

[0015] Preferably, each of the support plates is fixedly connected to a corresponding terminal head, and the outer wall of the terminal head is provided with a plug-in slot. There are two sets of plug-in slots, and the two sets of plug-in slots are rotationally symmetrical about the central axis of the terminal head. The terminal head is located inside the movable hole.

[0016] Preferably, the telescopic spring is located inside the placement cavity, one end of the telescopic spring is fixedly connected to one end of the terminal head, and the other end of the telescopic spring is fixedly connected to the inner wall of the placement cavity away from the movable hole.

[0017] Preferably, the rear terminal assembly includes a terminal block, one end of which has a groove, and the side wall of the terminal block has a plurality of circumferentially arrayed slots, each slot corresponding to a corresponding terminal head. A conductive sheet is fixedly connected to the inner wall of each slot away from the opening, and a limiting block corresponding to the insertion slot is fixedly connected to the inner wall of each slot. An air blowing hole is provided between the side wall of the terminal block and the inner wall of the groove, and a diffusion groove is provided on the side wall of the terminal block. A second wire is fixedly connected to the end of the terminal block away from the groove.

[0018] Preferably, one end of the telescopic airbag is fixedly connected to the end of the groove away from the opening, the other end of the telescopic airbag is slidably connected to the inner wall of the groove, the end of the telescopic airbag near the opening of the groove is fixedly connected to the magnetic ring, and an exhaust pipe is fixedly connected to the side wall of the telescopic airbag, the exhaust pipe being located inside the air blowing hole.

[0019] The beneficial effects of this invention are:

[0020] 1. During the connection of the terminal block and the terminal block, the locking and positioning between the limit block and the insertion slot increases the surface friction and prevents the terminal head from loosening accidentally during use, thus ensuring the stability of the terminal head after insertion. At the same time, the interaction force of magnetic ring one and magnetic ring two allows the gas inside the telescopic airbag one to be discharged from the exhaust pipe and blown onto the surface of the terminal head through the air blowing hole, thereby reducing the adhesion of dust on its surface and reducing the increase of contact resistance, so as to ensure the smooth passage of current.

[0021] 2. When the limiting block melts upon contact with an open flame, it loses its limiting effect on the insertion slot, causing the terminal head to move inside the slot. This separates the terminal head from the conductive plate, achieving automatic power-off and preventing the fire from spreading. Simultaneously, the telescopic spring moves the telescopic airbag, allowing compressed gas to be discharged into the storage cylinder through a one-way exhaust port. Once the gas is delivered to the storage cylinder, the airflow propels the extinguishing dry powder out of the nozzle. The concave arc surface of the diffuser promotes rapid dispersion of the dry powder, ensuring uniform spraying and extinguishing the fire at the connection point. This effectively increases the coverage area, improves the extinguishing effect, and reduces property damage and casualties. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of a relay terminal plug-in structure provided by an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of a terminal connection structure of a relay terminal plug-in structure provided by an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the plug-in assembly structure of a relay terminal plug-in structure provided by an embodiment of the present invention;

[0026] Figure 4 This is a partial structural cross-sectional view of a plug-in assembly of a relay terminal plug-in structure provided by an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of a terminal block structure for a relay terminal insertion structure provided by an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the boss in a relay terminal plug-in structure provided by an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the initial structure of a plug-in assembly for a relay terminal plug-in structure provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of a terminal block structure for a relay terminal insertion structure provided in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of a cleaning component structure for a relay terminal plug-in structure provided by an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of a half-section of a terminal block structure for a relay terminal insertion structure provided in an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of the terminal block cross-section structure of a relay terminal plug-in structure provided by an embodiment of the present invention;

[0034] Figure 12 This invention provides a relay terminal insertion structure. Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0035] In the diagram: 1. Relay; 2. Wire 1; 3. Front terminal assembly; 31. Terminal block; 32. Boss; 33. Limiting sliding hole; 34. Movable hole; 35. Through hole; 36. Placement cavity; 4. Rear terminal assembly; 41. Terminal block; 42. Slot; 421. Limiting block; 43. Air blowing hole; 44. Diffuser groove; 45. Groove; 46. Conductive sheet; 5. Wire 2; 6. Cleaning assembly; 61. Magnetic ring 1; 62. Telescopic airbag 1; 63. Exhaust pipe; 7. Plug-in assembly; 71. Push ring; 72. Magnetic ring 2; 73. Terminal head; 731. Plug-in slot; 74. Telescopic spring; 75. Support plate; 8. Fire extinguishing assembly; 81. Storage cylinder; 82. Spray hole; 83. Telescopic airbag 2; 831. One-way air inlet pipe; 832. One-way exhaust hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1, refer to Figures 1-12 A relay terminal plug-in structure includes a relay body 1, a wire 2 connected to the relay body 1, a front terminal assembly 3 connected to the wire 2, and a rear terminal assembly 4 connected to the front terminal assembly 3. It also includes:

[0038] Cleaning component 6 is connected to the rear terminal component 4. Cleaning component 6 includes a magnetic ring 61 and a telescopic airbag 62.

[0039] The plug-in assembly 7 is connected to the front terminal assembly 3. The plug-in assembly 7 includes a push ring 71 and a terminal head 73. The terminal head 73 is connected to a telescopic spring 74.

[0040] Fire extinguishing assembly 8 is connected to front terminal assembly 3. Fire extinguishing assembly 8 includes storage cylinder 81 and telescopic airbag 83.

[0041] Furthermore, the front terminal assembly 3 includes a terminal base 31 and a boss 32. One end of the terminal base 31 is fixedly connected to the wire 2, and the other end of the terminal base 31 is fixedly connected to the boss 32. The boss 32 has a placement cavity 36 inside, and the inner wall of the placement cavity 36 has a plurality of circumferentially arranged limiting sliding holes 33. The end of the boss 32 away from the terminal base 31 has a plurality of circumferentially arranged movable holes 34. The side wall of the boss 32 has a through hole 35, which is located inside the plurality of movable holes 34. The movable holes 34 and the through holes 35 are all connected to the placement cavity 36.

[0042] Placement of the protrusion 32 for the fire extinguishing component 8: Before use, the telescopic airbag 83 can be installed inside the placement cavity 36. In the initial state, the telescopic airbag 83 is in normal condition, and part of the terminal head 73 is located inside the placement cavity 36. When docking the terminal seat 31 and the terminal block 41, the end of the terminal head 73 located outside the protrusion 32 can be inserted into the corresponding slot 42. The magnetism of the end of the magnetic ring 61 away from the telescopic airbag 62 is the same polarity as the magnetism of the end of the magnetic ring 72 away from the push ring 71. This setting can better help with subsequent cleaning.

[0043] Furthermore, the push ring 71 is sleeved on the outside of the boss 32. A magnetic ring 72 is fixedly connected to the end of the push ring 71 away from the terminal seat 31. Several support plates 75 corresponding to the limiting sliding holes 33 are fixedly connected to the inner ring of the push ring 71. The support plates 75 are slidably connected to the limiting sliding holes 33. Each support plate 75 is fixedly connected to the corresponding terminal head 73. The outer wall of the terminal head 73 is provided with a plug-in slot 731. There are two sets of plug-in slots 731. The two sets of plug-in slots 731 are rotationally symmetrical about the central axis of the terminal head 73. The terminal head 73 is located inside the movable hole 34. The telescopic spring 74 is located inside the placement cavity 36. One end of the telescopic spring 74 is fixedly connected to one end of the terminal head 73. The other end of the telescopic spring 74 is fixedly connected to the inner wall of the placement cavity 36 away from the movable hole 34.

[0044] Connection between terminal head 73 and slot 42: First, apply external force to push ring 71, gradually moving it away from terminal base 31. During this process, push ring 71 drives support plate 75 to slide inside limiting sliding hole 33 to ensure stability during push ring 71 movement. At the same time, one end of terminal head 73 gradually moves away from boss 32, and telescopic spring 74 is stretched. Moreover, the movement of support plate 75 causes one end of telescopic airbag 83 to be elongated, thereby driving storage cylinder 81 to move away from terminal base 31. Simultaneously, air is injected into telescopic airbag 83 through one-way air inlet pipe 831, and the gas is stored inside the expanded telescopic airbag 83 for later use. When push ring 71 moves to its maximum extent, terminal head 73 is docked with the corresponding slot 42. Then, apply mutual force to push ring 71 and terminal base 41 to ensure that telescopic airbag 83 is in the expanded state while inserting terminal head 73 into the slot. Inside the slot 42, the terminal head 73 is positioned by the locking block 421 and the insertion slot 731 to increase surface friction and prevent accidental loosening during use, thus ensuring the stability of the terminal head 73 after insertion. Finally, one end of the terminal head 73 can contact the conductive sheet 46 to complete the insertion and connection process, so that the terminal base 31 and the terminal platform 41 are connected and fixed to each other. The end of the terminal head 73 located inside the placement cavity 36 is connected to the corresponding wire inside the terminal base 31 through the conductive wire. At the same time, the conductive wire can be stretched and contracted in conjunction with the movement of the telescopic spring 74. After the terminal head 73 and the slot 42 are connected, one end of the terminal platform 41 can be fitted on the outside of the boss 32 to effectively prevent dust, moisture and other substances from entering the terminal, avoid dust accumulation affecting contact performance, and effectively avoid moisture causing short circuits, corrosion and other problems, thus improving the reliability and service life of the terminal head 73.

[0045] In addition, the contact surfaces of the terminal head 73 and the insertion slot 731 can be hardened, such as by electroplating or chemical plating to form a layer of high-hardness metal coating, such as nickel plating or chromium plating. This can not only improve the wear resistance of the surface and reduce wear during insertion and extraction, but also increase the surface roughness to a certain extent, thereby increasing friction and enhancing insertion and extraction force.

[0046] Reference Figures 8-11Furthermore, the rear terminal assembly 4 includes a terminal block 41, one end of which has a groove 45. The side wall of the terminal block 41 has a plurality of circumferentially arrayed slots 42, each slot 42 corresponding to a specific terminal head 73. A conductive sheet 46 is fixedly connected to the inner wall of each slot 42 away from the opening. A limiting block 421 corresponding to the insertion slot 731 is fixedly connected to the inner wall of each slot 42. A blower is formed between the side wall of the terminal block 41 and the inner wall of the groove 45. The side wall of the terminal block 41 has a diffusion groove 44 and a wire 5 is fixedly connected to the end of the terminal block 41 away from the groove 45. One end of the telescopic airbag 62 is fixedly connected to the end of the groove 45 away from the opening, and the other end of the telescopic airbag 62 is slidably connected to the inner wall of the groove 45. The end of the telescopic airbag 62 near the opening of the groove 45 is fixedly connected to the magnetic ring 61. An exhaust pipe 63 is fixedly connected to the side wall of the telescopic airbag 62 and is located inside the air hole 43.

[0047] Cleaning dust from the surface of terminal head 73 using telescopic airbag 62: During the connection between terminal head 73 and slot 42, the interaction between magnetic ring 61 and magnetic ring 72 causes magnetic ring 61 to apply pressure to one end of telescopic airbag 62, thereby compressing telescopic airbag 62. At this time, the gas inside telescopic airbag 62 can be discharged from exhaust pipe 63 due to the compression. Moreover, each air hole 43 is located between two adjacent slots 42. Therefore, during the exhaust process of exhaust pipe 63, the gas can be blown from air hole 43 to the surface of terminal head 73, thereby reducing the adhesion of dust on its surface, reducing the increase of contact resistance, and ensuring smooth current flow.

[0048] The limiting block 421 is made of a material with high elasticity, good recovery performance, and low melting point. This allows it to better grip the insertion slot 731 during insertion and removal, providing greater insertion and removal force. It also maintains good elasticity even after multiple insertions and removals. Furthermore, the limiting block 421 can melt upon contact with an open flame, thus losing its limiting effect on the insertion slot 731. At this point, the recovery of the telescopic airbag 62 and the interaction between magnetic rings 61 and 72 cause the terminal head 73 to move inside the slot 42, separating it from the conductive sheet 46. This achieves automatic power-off, cutting off the current path in the circuit. The separation of the terminal head 73 allows the electrical circuit to be automatically cut off. The faulty part of the circuit is isolated from other normal parts, preventing the fault current from spreading to other intact circuit components. Moreover, when the terminal 73 is separated from the conductive piece 46, the circuit is de-energized, cutting off the energy source that generates heat. Without continuous current flow, there will be no large amount of heat generated by the current heating effect, thus preventing the fire from spreading further due to continuous high temperature. It also prevents excessive voltage or current from being conducted through the line to other connected equipment, thereby preventing the spread of this chain reaction. It interrupts the electrical connection between the faulty circuit and other circuits, confining the fire to the initial fault area, preventing the fire source from continuing to expand, and thus effectively reducing the spread of the fire and minimizing damage to other surrounding components.

[0049] Example 2, refer to Figures 3-4 Furthermore, the second telescopic airbag 83 is located inside the placement cavity 36. One end of the second telescopic airbag 83 is fixedly connected to the inner wall of the placement cavity 36 away from the through hole 35. A one-way air inlet pipe 831 is fixedly connected to the side wall of the second telescopic airbag 83, and the one-way air inlet pipe 831 is connected to the boss 32. A one-way exhaust hole 832 is opened at the end of the second telescopic airbag 83 away from the one-way air inlet pipe 831. One end of the second telescopic airbag 83 is fixedly connected to the storage cylinder 81. The storage cylinder 81 is located on one side of the one-way exhaust hole 832. A spray hole 82 is opened at the end of the storage cylinder 81 away from the second telescopic airbag 83. The outer wall of the storage cylinder 81 is slidably connected to the inner wall of the through hole 35.

[0050] The fire extinguishing component 8 extinguishes the fire source at the terminal after it ignites: When the limiting block 421 melts upon contact with an open flame, it loses its limiting effect on the insertion slot 731. At this time, the elastic recovery of the telescopic spring 74 can move one end of the telescopic airbag 83 towards the terminal seat 31. During the movement, the gas inside the telescopic airbag 83 is compressed. Due to the increase in its internal pressure, the compressed gas is discharged into the storage cylinder 81 through the one-way exhaust port 832. The storage cylinder 81 contains fire extinguishing dry powder. When the gas is delivered to the storage cylinder 8... After step 1, the accumulated dry powder will first be blown away, and the increased pressure will allow the gas to flow rapidly, so that the fire extinguishing dry powder is evenly sprayed out from multiple nozzles 82. After being sprayed out, the fire extinguishing dry powder will quickly form a covering layer on the surface of the burning electrical equipment. This covering layer can effectively isolate the burning material from the surrounding oxygen, thereby preventing the combustion reaction from continuing. In addition, the covering effect of the dry powder is like a firewall, confining the flame to the initial ignition area and preventing the fire from spreading to the entire electrical system, thereby achieving the fire extinguishing treatment at the connection point.

[0051] Furthermore, after the dry powder is sprayed from the nozzle 82, it can be directed into the interior of the diffusion groove 44. The concave arc surface of the diffusion groove 44 can promote the rapid dispersion of the dry powder in all directions, thereby ensuring the uniform spraying of the dry powder, effectively increasing the coverage area, and thus improving the fire extinguishing effect.

[0052] It should be noted that the specific model and specifications of each component need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A relay terminal plug-in structure, comprising a relay body (1), wherein the relay body (1) is connected to a first wire (2), the first wire (2) is connected to a front terminal assembly (3), and the front terminal assembly (3) is connected to a rear terminal assembly (4), characterized in that, Also includes: Cleaning component (6), which is connected to the rear terminal component (4), includes a magnetic ring (61) and a telescopic airbag (62). A plug-in assembly (7) is connected to a front terminal assembly (3). The plug-in assembly (7) includes a push ring (71) and a terminal head (73). The terminal head (73) is connected to a telescopic spring (74). Fire extinguishing assembly (8), which is connected to front terminal assembly (3), includes a storage cylinder (81) and a telescopic airbag (83). The front terminal assembly (3) includes a terminal block (31) and a boss (32). One end of the terminal block (31) is fixedly connected to the wire (2), and the other end of the terminal block (31) is fixedly connected to the boss (32). The boss (32) has a placement cavity (36) inside, and the inner wall of the placement cavity (36) has a plurality of circumferentially arranged limiting sliding holes (33). The boss (32) has several movable holes (34) arranged in a circular array at one end away from the terminal block (31). The side wall of the boss (32) has a through hole (35). The through hole (35) is located inside the multiple movable holes (34). Both the movable holes (34) and the through hole (35) are connected to the placement cavity (36). The second telescopic airbag (83) is located inside the placement cavity (36). One end of the second telescopic airbag (83) is fixedly connected to the inner wall of the placement cavity (36) away from the through hole (35). A one-way air inlet pipe (831) is fixedly connected to the side wall of the second telescopic airbag (83). The one-way air inlet pipe (831) is connected to the boss (32). One-way exhaust port (832) is provided at the end of the telescopic airbag two (83) away from the one-way air inlet pipe (831). One end of the telescopic airbag two (83) is fixedly connected to the storage cylinder (81). The storage cylinder (81) is located on one side of the one-way exhaust port (832). The end of the storage cylinder (81) away from the telescopic airbag two (83) is provided with a spray hole (82). The outer wall of the storage cylinder (81) is slidably connected to the inner wall of the through hole (35). The push ring (71) is sleeved on the outside of the boss (32). A magnetic ring (72) is fixedly connected to one end of the push ring (71) away from the terminal block (31). A number of support plates (75) corresponding to the limiting sliding holes (33) are fixedly connected to the inner ring of the push ring (71). The support plates (75) are slidably connected to the limiting sliding holes (33). Each of the support plates (75) is fixedly connected to the corresponding terminal head (73). The outer wall of the terminal head (73) is provided with a plug-in slot (731). There are two sets of plug-in slots (731). The two sets of plug-in slots (731) are symmetrical about the central axis of the terminal head (73). The terminal head (73) is located inside the movable hole (34). The telescopic spring (74) is located inside the placement cavity (36). One end of the telescopic spring (74) is fixedly connected to one end of the terminal head (73), and the other end of the telescopic spring (74) is fixedly connected to the inner wall of the placement cavity (36) away from the movable hole (34). The rear terminal assembly (4) includes a terminal block (41), one end of which is provided with a groove (45). The side wall of the terminal block (41) is provided with a plurality of circumferentially arrayed slots (42), each slot (42) corresponding to a corresponding terminal head (73). A conductive sheet (46) is fixedly connected to the inner wall of each slot (42) away from the opening. A limiting block (421) corresponding to the insertion slot (731) is fixedly connected to the inner wall of each slot (42). An air blowing hole (43) is provided between the side wall of the terminal block (41) and the inner wall of the groove (45). A diffusion groove (44) is provided on the side wall of the terminal block (41). A wire two (5) is fixedly connected to the end of the terminal block (41) away from the groove (45). One end of the telescopic airbag (62) is fixedly connected to the end of the groove (45) away from the opening. The other end of the telescopic airbag (62) is slidably connected to the inner wall of the groove (45). The end of the telescopic airbag (62) near the opening of the groove (45) is fixedly connected to the magnetic ring (61). An exhaust pipe (63) is fixedly connected to the side wall of the telescopic airbag (62). The exhaust pipe (63) is located inside the air blowing hole (43).

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