Protective device for electrical contact assembly

Abstract

The utility model discloses a protection device for an electrical contact assembly, which comprises a protection device body arranged on the electrical contact assembly, the electrical contact assembly comprises electrical equipment, a binding post arranged on the electrical equipment and a lead connected to the binding post, and the protection device body comprises an installation sleeve. The mounting sleeve fixedly sleeves the binding post, two mounting plates are arranged on the right side of the mounting sleeve, the left side of the mounting plate on the left side is fixedly connected with the right side of the mounting sleeve, and two elastic guide mechanisms are fixedly connected between the sides, close to each other, of the two mounting plates. According to the utility model, through the arrangement of a series of structures, the pulling force of the lead can be effectively buffered and unloaded, and the pulling force does not need to be overcome by the strength of the lead, so that the pulling protection of the lead is realized, cold air can be blown to the lead for cooling, the aging rate of the lead is reduced, and the service life of the lead is prolonged. Therefore, cooling protection of the lead is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical contact components, in particular to a protection device for electrical contact components. Background Art

[0002] Electrical contacts are essentially the conductive parts of conductors that touch each other. Their function is to extend the current on one conductor to another. They are both important components of electrical appliances and current-carrying conductors, and are also the weak link in the circuit. Their quality will affect the operation of the circuit. Electrical contacts can be divided into three categories according to their contact methods: fixed-connection contacts, which refer to electrical contacts in which the conductors being touched and connected cannot move relative to each other, such as busbar joints and lead connections of electrical equipment; sliding contacts, in which the conductors can maintain contact with each other, the elastic knots of the busbars, the brushes of the motors, etc., are all sliding contacts; breakable contacts, if the contacts can be closed or disconnected during normal operation, are called breakable contacts, and the contacts of various switches are breakable contacts; among them, the lead connection of electrical equipment belongs to the fixed-connection contact, but the leads of existing electrical equipment are completely supported by the strength of the leads themselves when pulled, which can easily cause them to be damaged. Or the joint is loose, for this purpose, application number: 202120404260.0 discloses a protective device for an electrical contact assembly, including an electrical device, a terminal is arranged above the electrical device, the outside of the terminal is movably connected with a lead, the outside of the terminal is sleeved with a movable sleeve located outside the lead, the right end of the movable sleeve is fixedly installed with a first connecting plate located outside the lead, the right end of the first connecting plate is fixedly installed with a first fixed box, the inside of the first fixed box is movably connected with a first movable rod having one end passing through and extending to the outside of the first fixed box, and the right end of the first movable rod is fixedly installed with a second connecting plate; the protective device for the electrical contact assembly has the advantage of anti-pulling, and solves the problem that the lead of the existing electrical equipment is completely supported by the strength of the lead itself when being pulled, which is easy to cause it to be damaged, or the joint is loose, affecting the normal transmission of the lead;

[0003] The protective device for the electrical contact assembly disclosed in the above patent can buffer and unload the pulling force when the lead is pulled, and does not need to rely on the strength of the lead itself to overcome the pulling force. However, it still has some shortcomings during use: 1. The lead will generate heat during use, and there is a lack of structure to cool and dissipate the heat during the use of the lead. There is a risk of accelerated aging of the lead due to high temperature, which cannot meet the use requirements. Based on the above situation, improvements are made, so we propose a protective device for an electrical contact assembly. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a protection device for an electrical contact assembly.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A protective device for an electrical contact assembly comprises a protective device body installed on the electrical contact assembly, the electrical contact assembly comprises an electrical device, a terminal installed on the electrical device and a lead connected to the terminal, the protective device body comprises a mounting sleeve, the mounting sleeve fixing sleeve is arranged on the terminal, two mounting plates are arranged on the right side of the mounting sleeve, the left side of the left mounting plate is fixedly connected to the right side of the mounting sleeve, two elastic guide mechanisms are fixedly connected between the sides of the two mounting plates close to each other, the elastic guide mechanisms can guide the two mounting plates to each other, a telescopic sleeve is fixedly connected between the sides of the two mounting plates close to each other, the two elastic guide mechanisms are both located in the telescopic sleeve, the telescopic sleeve is used to shield and protect the components between the two mounting plates, a winding mechanism is installed on the right side of the left mounting plate, and the right end of the lead The right side of the mounting plate extending to the right side is that the lead is wound on the winding mechanism, and the winding mechanism is used to wind and release the lead. The right side mounting plate fixed sleeve is arranged on the lead, and the left side mounting plate movable sleeve is arranged on the lead. A connecting cavity is provided on the left mounting plate, and a blowing mechanism is connected and fixed on the right side of the connecting cavity. The winding mechanism is located in the blowing mechanism, and the blowing mechanism is used to blow cold air to the lead. A first groove is provided on the right top of the mounting sleeve, and the right side of the first groove is connected to the left top of the connecting cavity. A plurality of first blowing heads are embedded and fixed on the bottom inner wall of the first groove, and the bottom of the first blowing head extends into the mounting sleeve and is located above the lead. A cold air supply mechanism is fixedly connected to the left side of the mounting sleeve, and the right side of the cold air supply mechanism is connected and fixed to the left side of the first groove, and the cold air supply mechanism is used to supply cold air to the inside of the first groove.

[0007] Preferably, the elastic guiding mechanism includes a guide tube, the left ends of the two guide tubes are fixedly connected to the right side of the left mounting plate, the left side of the right mounting plate is fixedly connected to two guide rods, the guide tubes are slidably mounted on the corresponding guide rods, the guide tubes and the guide rods cooperate to guide the two mounting plates to each other, a spring is fixedly connected between the right end of the guide tube and the left side of the right mounting plate, the spring is movably mounted on the corresponding guide rod, and under the elastic force of the spring, the pulling force of the lead wire can be effectively buffered and unloaded.

[0008] Preferably, the blowing mechanism includes an L-shaped tube and a transverse tube which are connected and fixed on the right side of the connecting cavity, the right end of the transverse tube is set as a blocking structure, the top of the transverse tube and the top inner wall, the right inner wall and the bottom end of the L-shaped tube are connected and fixed with a second blowing head, the winding mechanism and the lead are located between the multiple second blowing heads, and the gas blown out by the multiple second blowing heads is used to cool the lead, an exhaust hole is opened on the right side of the right mounting plate, a dustproof net is fixedly sleeved in the exhaust hole, and the exhaust hole is used for discharging the blown gas.

[0009] Preferably, the cold air supply mechanism includes a water tank fixedly connected to the left side of the mounting sleeve, a connecting pipe is fixedly connected to the bottom inner wall of the water tank, the right end of the connecting pipe is connected and fixed to the left side of the first groove, the water tank is filled with cold air water, a circular frame is fixedly connected to the left top of the water tank, an air pump is fixedly connected between the top inner wall and the bottom inner wall of the circular frame, the air pump extracts external gas, the right side of the air pump is a discharge end and is connected and fixed with a conical cover, the right side of the conical cover is connected and fixed with the left end of the connecting pipe, the left side of the air pump is an extraction end and is fixedly connected with a filter, a temperature sensor is fixedly connected to the left inner wall of the mounting sleeve, the detection end of the temperature sensor is in movably contact with the left side of the lead, the temperature sensor is used to detect the temperature of the lead, and its detection principle is the prior art and will not be elaborated here, a controller is fixedly connected to the left side of the water tank, the temperature sensor and the air pump are both electrically connected to the controller.

[0010] Preferably, the winding mechanism includes a U-shaped rod, the left side of the U-shaped rod is fixedly connected to the right side of the mounting plate on the left side, a winding roller is rotatably installed between the front inner wall and the rear inner wall of the U-shaped rod, the lead wire is wound on the winding roller, and the front and rear ends of the winding roller are respectively fixedly connected to the front inner wall and the rear inner wall of the U-shaped rod with torsion springs, and the torsion spring is twisted and compressed while the winding roller rotates, and when the pulling force is relaxed, the elastic force of the torsion spring can be used to drive the winding roller to rotate to wind up the lead wire.

[0011] Preferably, first through holes are formed on both inner walls of the connecting cavity, and the inner walls of the first through holes are in active contact with the outer sides of the lead wires.

[0012] Preferably, two first ventilation holes are opened on the right inner wall of the connecting cavity, the upper first ventilation hole is connected to the left end of the L-shaped tube, the lower first ventilation hole is connected to the left end of the horizontal tube, and the second ventilation hole is opened on the left inner wall of the connecting cavity, and the second ventilation hole is connected to the right side of the first groove.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] 1. Through the coordination of the elastic guide mechanism and the winding mechanism, the pulling force of the lead wire can be effectively buffered and unloaded, without relying on the strength of the lead wire itself to overcome the pulling force, thereby achieving pulling protection for the lead wire;

[0015] 2. Through the coordination of the blowing mechanism, the connecting cavity and the cold air supply mechanism, when the temperature of the lead wire is high, cold air can be blown to cool it down, which can effectively reduce the risk of accelerated aging of the lead wire at high temperature and achieve cooling protection for the lead wire;

[0016] The utility model can effectively buffer and unload the pulling force of the lead wire through the arrangement of a series of structures, and does not need to rely on the strength of the lead wire itself to overcome the pulling force, thereby realizing the pulling protection of the lead wire, and can blow cold air to cool the lead wire to reduce the aging rate of the lead wire, thereby achieving the cooling protection of the lead wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a protective device for an electrical contact assembly proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of a front cross-sectional structure of a protection device for an electrical contact assembly proposed by the utility model;

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0020] Figure 4 The utility model is a three-dimensional structural schematic diagram of an electrical contact assembly of a protective device for an electrical contact assembly in an uninstalled state.

[0021] In the figure: 100, electrical equipment; 101, terminal; 102, lead wire; 103, mounting sleeve; 1, mounting plate; 2, winding mechanism; 3, guide tube; 4, guide rod; 5, telescopic sleeve; 6, spring; 7, exhaust hole; 8, connecting cavity; 9, horizontal tube; 10, L-shaped tube; 11, water tank; 12, connecting pipe; 13, first slot; 14, temperature sensor; 15, circular frame; 16, air pump; 17, conical cover; 18, controller. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-4A protective device for an electrical contact assembly comprises a protective device body mounted on the electrical contact assembly, the electrical contact assembly comprises an electrical device 100, a terminal 101 mounted on the electrical device 100 and a lead 102 connected to the terminal 101, the protective device body comprises a mounting sleeve 103, the mounting sleeve 103 is fixedly mounted on the terminal 101, two mounting plates 1 are arranged on the right side of the mounting sleeve 103, the left side of the left mounting plate 1 is fixedly connected to the right side of the mounting sleeve 103, two elastic guide mechanisms are fixedly connected between the sides of the two mounting plates 1 close to each other, a telescopic sleeve 5 is fixedly connected between the sides of the two mounting plates 1 close to each other, the two elastic guide mechanisms are both located in the telescopic sleeve 5, the telescopic sleeve 5 is used to shield and protect between the two mounting plates 1, wherein the elastic guide mechanism includes The guide tubes 3 are enclosed, the left ends of the two guide tubes 3 are fixedly connected to the right side of the mounting plate 1 on the left, and the left side of the mounting plate 1 on the right is fixedly connected to two guide rods 4, the guide tubes 3 are slidably sleeved on the corresponding guide rods 4, wherein the inner walls of the two guide tubes 3 on the side close to each other are provided with limiting holes, and the two guide rods 4 on the side close to each other are fixedly connected with limiting blocks, the limiting blocks are slidably connected to the corresponding limiting holes, and the limiting blocks cooperate with the corresponding limiting holes to limit and prevent the guide rods 4 from falling off, and the guide tubes 3 and the guide rods 4 cooperate to guide the two mounting plates 1 to each other, and a spring 6 is fixedly connected between the right end of the guide tube 3 and the left side of the mounting plate 1 on the right, and the spring 6 is movably sleeved on the corresponding guide rod 4, and under the elastic force of the spring 6, the pulling force of the lead 102 can be effectively buffered and unloaded;

[0024] A winding mechanism 2 is installed on the right side of the left mounting plate 1, and the right end of the lead 102 extends to the right side of the right mounting plate 1. The lead 102 is wound on the winding mechanism 2. The winding mechanism 2 is used to wind and release the lead 102. The winding mechanism 2 includes a U-shaped rod, and the left side of the U-shaped rod is fixedly connected to the right side of the left mounting plate 1. A winding roller is rotatably installed between the front inner wall and the rear inner wall of the U-shaped rod, wherein the front inner wall and the rear inner wall of the U-shaped rod are both provided with bearing holes, and a bearing is fixedly sleeved in the bearing hole, and a bearing is fixed in the bearing. The fixed sleeve is provided with a pin shaft, and the ends of the two pin shafts close to each other are fixedly connected to the front end and the rear end of the winding roller respectively. The pin shaft and the bearing cooperate to achieve the effect of rotating installation of the winding roller. The lead wire 102 is wound around the winding roller. The front end and the rear end of the winding roller are respectively fixedly connected to the front inner wall and the rear inner wall of the U-shaped rod with a torsion spring. The torsion spring is movably sleeved on the outer side of the pin shaft. When the winding roller rotates, the torsion spring is twisted and compressed. When the pulling force is relaxed, the elastic force of the torsion spring can be used to drive the winding roller to rotate to reel the lead wire 102.

[0025] The right side mounting plate 1 is fixedly sleeved on the lead 102, wherein the right side mounting plate 1 is provided with a mounting hole for fixing the lead 102, the left side mounting plate 1 is movably sleeved on the lead 102, the left side mounting plate 1 is provided with a connecting cavity 8, wherein the inner walls on both sides of the connecting cavity 8 are provided with first through holes, the inner walls of the first through holes are in movable contact with the outer side of the lead 102, the right side of the connecting cavity 8 is connected and fixed with a blowing mechanism, the winding mechanism 2 is located in the blowing mechanism, the blowing mechanism includes an L-shaped tube 10 and a horizontal tube 9 connected and fixed on the right side of the connecting cavity 8, wherein the right side inner wall of the connecting cavity 8 is provided with a through hole. There are two first air vents, the upper first air vent is connected to the left end of the L-shaped tube 10, the lower first air vent is connected to the left end of the transverse tube 9, the right end of the transverse tube 9 is set as a blocking structure, the top of the transverse tube 9 and the top inner wall, right inner wall and bottom end of the L-shaped tube 10 are connected and fixed with a second air blowing head, the winding mechanism 2 and the lead 102 are located between the plurality of second air blowing heads, and the gas blown out by the plurality of second air blowing heads is used to cool the lead 102, and an exhaust hole 7 is opened on the right side of the right mounting plate 1, and a dustproof net is fixedly sleeved in the exhaust hole 7, and the exhaust hole 7 is used for exhausting the blown gas;

[0026] A first groove 13 is provided at the top right side of the mounting sleeve 103, and the right side of the first groove 13 is connected to the top left side of the connecting cavity 8, wherein a second vent hole is provided on the inner wall on the left side of the connecting cavity 8, and the second vent hole is connected to the right side of the first groove 13, and a plurality of first air blowing heads are embedded and fixed on the bottom inner wall of the first groove 13, and the bottom of the first air blowing head extends into the mounting sleeve 103 and is located above the lead 102, and a cold air supply mechanism is fixedly connected to the left side of the mounting sleeve 103, and the right side of the cold air supply mechanism is connected and fixed to the left side of the first groove 13. The cold air supply mechanism includes a water tank 11 fixedly connected to the left side of the installation sleeve 103, a drain valve is fixedly connected to the left bottom of the water tank 11, and the drain valve is used to discharge the water inside the water tank 11, a connecting pipe 12 is fixedly connected to the bottom inner wall of the water tank 11, and the right end of the connecting pipe 12 is fixedly connected to the left side of the first groove 13, the water tank 11 is filled with cold water, a circular frame 15 is fixedly connected to the top of the left side of the water tank 11, and an air pump 16 is fixedly connected between the top inner wall and the bottom inner wall of the circular frame 15, and the air pump 16 is used to pump the external gas The right side of the air pump 16 is the discharge end and is connected and fixed with a conical cover 17. The right side of the conical cover 17 is connected and fixed with the left end of the connecting pipe 12. The left side of the air pump 16 is the extraction end and is fixedly connected with a filter screen. The filter screen is used to filter dust and impurities in the gas extracted by the air pump 16. The left inner wall of the mounting sleeve 103 is fixedly connected with a temperature sensor 14. The detection end of the temperature sensor 14 is in active contact with the left side of the lead 102. The temperature sensor 14 is used to detect the temperature of the lead 102. The detection principle is the existing The technology is not elaborated here. The left side of the water tank 11 is fixedly connected with a controller 18, and the temperature sensor 14 and the air pump 16 are electrically connected to the controller 18. The utility model can effectively buffer and unload the pulling force of the lead 102 through a series of structural settings. There is no need to rely on the strength of the lead 102 itself to overcome the pulling force, thereby realizing the pulling protection of the lead 102, and can blow cold air to cool the lead 102 to reduce the aging rate of the lead 102, thereby achieving the cooling protection of the lead 102.

[0027] Working principle: When in use, when the lead 102 is subjected to a pulling force, the lead 102 drives the right mounting plate 1 to move to the right, and the right mounting plate 1 drives the two guide rods 4 to slide to the right in the corresponding guide tubes 3 respectively, and the right mounting plate 1 stretches the two springs 6 to the right, and the lead 102 moves to the right while also driving the winding roller to rotate to release the lead 102, and the winding roller rotates while twisting and compressing the two torsion springs, under the elastic force of the torsion spring and the elastic force of the spring 6, in combination with the way of releasing the lead 102, the pulling force of the lead 102 can be buffered and unloaded, and there is no need to rely on the strength of the lead 102 itself to overcome the pulling force, thereby achieving pulling protection for the lead 102;

[0028] During the use of the lead 102, heat is generated, which causes the temperature of the lead 102 to rise. The temperature sensor 14 detects the temperature of the lead 102 and transmits the temperature value to the controller 18. When the temperature sensor 14 detects that the temperature of the lead 102 is higher than the preset value, the temperature sensor 14 transmits a signal to the controller 18. The controller 18 controls the air pump 16 to start, and the air pump 16 extracts the external gas. The extracted gas enters the connecting pipe 12 through the conical cover 17. The cooling water inside the water tank 11 absorbs the temperature of the gas in the connecting pipe 12, thereby achieving the effect of cooling the gas inside the connecting pipe 12, so that the gas inside the connecting pipe 12 becomes The cold air enters the first groove 13, and a part of the gas inside the first groove 13 is blown to the lead 102 through a plurality of first blowing heads, and at the same time, another part of the cold air enters the connecting cavity 8, and the cold air inside the connecting cavity 8 enters the L-shaped tube 10 and the transverse tube 9, and the cold air inside the L-shaped tube 10 and the transverse tube 9 is blown out to the lead 102 through a plurality of second blowing heads. By blowing cold air to the lead 102, the heat on the lead 102 can be absorbed and cooled, and at the same time, the gas is discharged to the outside through the exhaust hole 7, thereby achieving the effect of blowing cold air to cool the lead 102, which can effectively reduce the risk of accelerated aging of the lead 102 due to high temperature, thereby achieving cooling protection for the lead 102.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A protection device for an electrical contact assembly, comprising a protection device body mounted on the electrical contact assembly, wherein the electrical contact assembly comprises an electrical device (100), a terminal (101) mounted on the electrical device (100), and a lead (102) connected to the terminal (101), characterized in that: The protective device body comprises a mounting sleeve (103), the mounting sleeve (103) being fixedly mounted on the terminal post (101), two mounting plates (1) being arranged on the right side of the mounting sleeve (103), the left side of the left mounting plate (1) being fixedly connected to the right side of the mounting sleeve (103), two elastic guide mechanisms being fixedly connected between the two mounting plates (1) on the sides close to each other, a telescopic sleeve (5) being fixedly connected between the two mounting plates (1) on the sides close to each other, the two elastic guide mechanisms being both located in the telescopic sleeve (5), a winding mechanism (2) being installed on the right side of the left mounting plate (1), the right end of the lead wire (102) extending to the right side of the right mounting plate (1), the lead wire (102) being wound on the winding mechanism (2), and the right mounting plate (1) A fixed sleeve is arranged on the lead wire (102), and a left mounting plate (1) is movably arranged on the lead wire (102). A connecting cavity (8) is provided on the left mounting plate (1), and a blowing mechanism is connected and fixed to the right side of the connecting cavity (8), and a winding mechanism (2) is located in the blowing mechanism. A first groove (13) is provided on the top right side of the mounting sleeve (103), and the right side of the first groove (13) is connected to the top left side of the connecting cavity (8). A plurality of first blowing heads are embedded and fixed on the inner wall of the bottom of the first groove (13), and the bottom of the first blowing head extends into the mounting sleeve (103) and is located above the lead wire (102). A cold air supply mechanism is fixedly connected to the left side of the mounting sleeve (103), and the right side of the cold air supply mechanism is connected and fixed to the left side of the first groove (13).

2. A protective device for an electrical contact assembly according to claim 1, characterized in that: The elastic guide mechanism comprises a guide tube (3), the left ends of the two guide tubes (3) are fixedly connected to the right side of the left mounting plate (1), the left side of the right mounting plate (1) is fixedly connected to two guide rods (4), the guide tube (3) is slidably sleeved on the corresponding guide rod (4), a spring (6) is fixedly connected between the right end of the guide tube (3) and the left side of the right mounting plate (1), and the spring (6) is movably sleeved on the corresponding guide rod (4).

3. A protective device for an electrical contact assembly according to claim 2, characterized in that: The blowing mechanism comprises an L-shaped tube (10) and a transverse tube (9) which are connected and fixed on the right side of the connecting cavity (8); the right end of the transverse tube (9) is provided with a blocking structure; the top of the transverse tube (9) and the top inner wall, the right inner wall and the bottom end of the L-shaped tube (10) are connected and fixed with a second blowing head; the winding mechanism (2) and the lead wire (102) are both located between the plurality of second blowing heads; an exhaust hole (7) is provided on the right side of the right mounting plate (1); a dustproof net is fixedly sleeved in the exhaust hole (7).

4. A protection device for an electrical contact assembly according to claim 3, characterized in that: The cold air supply mechanism comprises a water tank (11) fixedly connected to the left side of the installation sleeve (103); a connecting pipe (12) is fixedly connected to the bottom inner wall of the water tank (11); the right end of the connecting pipe (12) is connected and fixedly connected to the left side of the first groove (13); the water tank (11) is filled with cold air water; a circular frame (15) is fixedly connected to the top of the left side of the water tank (11); an air pump (16) is fixedly connected between the top inner wall and the bottom inner wall of the circular frame (15); the right side of the air pump (16) is a discharge end and is connected to the first groove (13); A cone cover (17) is fixedly provided, the right side of the cone cover (17) is connected and fixedly connected to the left end of the connecting pipe (12), the left side of the air pump (16) is an extraction end and is fixedly connected to a filter screen, a temperature sensor (14) is fixedly connected to the left inner wall of the mounting sleeve (103), the detection end of the temperature sensor (14) is in active contact with the left side of the lead wire (102), a controller (18) is fixedly connected to the left side of the water tank (11), and the temperature sensor (14) and the air pump (16) are both electrically connected to the controller (18).

5. A protection device for an electrical contact assembly according to claim 4, characterized in that: The winding mechanism (2) comprises a U-shaped rod, the left side of the U-shaped rod is fixedly connected to the right side of the left mounting plate (1), a winding roller is rotatably mounted between the front inner wall and the rear inner wall of the U-shaped rod, the lead wire (102) is wound around the winding roller, and the front and rear ends of the winding roller are respectively fixedly connected to the front inner wall and the rear inner wall of the U-shaped rod by torsion springs.

6. A protection device for an electrical contact assembly according to claim 1, characterized in that: First through holes are provided on both inner walls of the connecting cavity (8), and the inner walls of the first through holes are in active contact with the outer sides of the lead wires (102).

7. A protection device for an electrical contact assembly according to claim 3, characterized in that: Two first ventilation holes are provided on the right inner wall of the connecting cavity (8), the upper first ventilation hole is connected to the left end of the L-shaped tube (10), the lower first ventilation hole is connected to the left end of the horizontal tube (9), and a second ventilation hole is provided on the left inner wall of the connecting cavity (8), the second ventilation hole is connected to the right side of the first groove (13).

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