CN214176282U - Safety socket - Google Patents

Abstract

The utility model discloses a safety socket, include: the casing, there are two electrode shell fragments in the casing, its outside have with electrode shell fragment pin hole, every electrode shell fragment includes: the electric conduction elastic piece comprises an electric conduction elastic piece, a movable block, an elastic piece support and an electrified elastic piece, wherein one end of the electric conduction elastic piece is connected with the electrode elastic piece, the other end of the electric conduction elastic piece is a contact end, the movable block is arranged beside the electrode elastic piece and slides forwards and backwards, one end of the movable block is arranged at the electrode elastic piece and can form a pushing contact point with the plug pins, the other end of the movable block is in contact with one end of the elastic piece support and pushes the elastic piece support to slide in the shell, the elastic piece support is provided with a reset spring, the other end of the elastic piece support is connected with the electrified elastic piece, and the electrified elastic piece can be connected with the contact end of the electric conduction elastic piece under the pulling of the elastic piece support. When the socket is used, the principle of controlling the power-on and power-off by the clutch is utilized, the electrode elastic sheet of the socket is in a non-electricity state when the socket is in a non-use state, the safety of the socket and the adaptability of the socket to the environment are improved, and the occurrence of accidents of electric leakage and electric shock caused by various reasons is effectively reduced.

Description

Safety socket

Technical Field

The utility model belongs to the technical field of the electrical installation technique and specifically relates to indicate one kind can improve the safety in utilization to and have the safety socket of leak protection, electric shock.

Background

At present, a socket is also called a power socket and a switch socket, and is an electrical device which is used in cooperation with a plug of a load device and provides a continuous power supply for the load device. The civil socket generally has two jacks, three jacks or a socket combined with the two jacks according to power, and in any socket, each jack hole on the socket corresponds to an electrode elastic sheet in the socket one by one, and the bottom of each electrode elastic sheet is respectively and directly connected with power lines such as a live wire, a zero line and a ground wire (the two-jack socket has no ground wire) through screws. Based on this, when the socket circular telegram back, its electrode shell fragment is in electrified state that generates heat promptly, if the jack of socket has got into the electric conductor, if: objects such as water, iron wires and the like can cause accidents such as electric leakage, electric shock and the like, and meanwhile, the power supply protection device can also be caused to disconnect a power supply switch, so that the problems of burning out and firing of a socket and load equipment can be caused seriously. Moreover, the environmental compatibility of such a socket is also poor, for example: if the socket is used in a water-containing environment such as a kitchen, a bathroom and the like, water is easily splashed into the socket, and leakage and electric shock accidents occur. Secondly, if the operation is not proper, the pins of the plug are inserted askew or not smoothly, electric sparks are generated, which not only frighten the user, but also affect the stability of the power supply current, and cause the damage of the socket and the load equipment, and the generated electric sparks can bring the hidden troubles of electric leakage and fire.

Based on the above problems, in order to improve the safety and environmental adaptability of the socket, a movable door is additionally arranged at the inner bottom of the pin hole of the socket as a safety measure, and the socket prevents the electric conductor from entering the socket and contacting with the electrode spring piece of the socket when not in use, so that the situations of leakage, electric shock and short circuit occur. However, if the operation is not proper, electric sparks still can be generated, and moreover, some movable doors are also provided with inclined openings, so that the movable doors can be inevitably pushed away by some stubborn or curious children through electric conductors and inserted into sockets, and finally, electric shock accidents are caused, and serious consequences which are difficult to compensate are caused.

The inventor of the present invention has developed the idea of the creation, and has designed the idea with many years of related experience, and has developed the creation through many studies, trial and study of sample tests, and many modifications and improvements.

Disclosure of Invention

The utility model aims at solving the problem that the electrified state of the electrode shell fragment circular telegram of above-mentioned socket causes the electric leakage easily, touches promptly to and potential safety hazards such as self or load equipment damage, provide a security higher, the better safe socket of environment suitability.

In order to achieve the above object, the present invention provides two solutions to the above technical drawbacks, the contents of which are as follows.

In one aspect, a safety receptacle includes: the casing, the inside of casing is equipped with two electrode shell fragments, the outside of casing be equipped with respectively with two electrode shell fragments one-to-one participate in the hole, every electrode shell fragment still include: the electric connector comprises an electric conduction elastic sheet, a movable block, an elastic sheet support and an electrified elastic sheet, wherein one end of the electric conduction elastic sheet is connected with the electrode elastic sheet, the other end of the electric conduction elastic sheet is a contact end, the movable block is arranged beside the electrode elastic sheet and can slide back and forth, one end of the movable block is arranged at the electrode elastic sheet and can form a contact point for pushing with a plug pin, the other end of the movable block is in contact with one end of the elastic sheet support and pushes the elastic sheet support to slide in a shell, the elastic sheet support is provided with a reset spring for pushing the elastic sheet support to reset, the other end of the elastic sheet support is fixedly connected with the electrified elastic sheet, and the electrified elastic sheet can be connected with the contact end of the electric conduction elastic sheet under the pulling of the elastic sheet support.

In the first technical scheme, the two electrode elastic sheets are electrified or powered off by the mechanical cooperation control separation among the conductive elastic sheet, the movable block, the elastic sheet bracket and the electrified elastic sheet, so that the electrode elastic sheets of the socket are always in a non-electricity state in a non-working state, when the electrode elastic sheets need to be electrified, two pins of a standard plug are correctly inserted into pin holes of the socket, the two pins can simultaneously push the respective movable block to slide, the movable block pushes the elastic sheet bracket to slide backwards, the electrified elastic sheet is pulled to be connected with a contact end of the conductive elastic sheet, and at the moment, the two electrode elastic sheets are only in an electrified state; on the contrary, after the two pins are pulled out, the elastic sheet bracket pushes the movable block to slide forwards to reset under the action of the reset spring of the elastic sheet bracket, and at the moment, the two electrode elastic sheets are in the non-electric state again. Through the improvement of the structure, the two electrode elastic pieces cannot be simultaneously contacted and electrified by using a single pin or a non-standard pin/a conducting object, and the contact and the electrification can be completed only by simultaneously inserting the standard pin, so that the safety of the socket is improved, and the environmental suitability is better.

Furthermore, the conductive elastic sheet, the movable block, the elastic sheet bracket and the electrified elastic sheet between the two electrode elastic sheets are arranged and move in a reverse direction. Among this preferred technical scheme, reverse installation sets up the insertion dynamics of effectively dispersing the participate in, avoids its insertion dynamics to incline to one side, increases the insertion resistance, makes to insert not smooth and orderly, in addition, can also alleviate the load between each part.

Further, the method also comprises the following steps: the inner shell cover is provided with two independent isolation cabin bodies, and the two isolation cabin bodies can be respectively used for accommodating the two electrode elastic sheets and separating the two electrode elastic sheets from each other. In the preferred technical scheme, the two isolation bins can ensure that respective electrode shrapnel are not interfered with each other, and the common conducting liquid can not generate liquid conduction after being splashed, so that the safety and the environmental adaptability of the socket can be further enhanced and improved.

Furthermore, the contact end of the conductive elastic sheet is also provided with a buffer spring for buffering. In the preferred technical scheme, because electrified shell fragment and electrically conductive shell fragment contact collision can produce the impact, and buffer spring plays certain cushioning effect to the impact of the two just, both can guarantee the toughness of electrically conductive shell fragment, can prevent again that electrically conductive shell fragment warp after frequent contact.

Technical solution two, a safety socket includes: the casing, the inside of casing is equipped with three electrode shell fragment, the outside of casing be equipped with respectively with the hole of participating in of three electrode shell fragment one-to-one still includes: a live wire conductive elastic sheet, a zero line conductive elastic sheet, a movable block, an elastic sheet bracket, a live wire electrified elastic sheet and a zero line electrified elastic sheet, one end of the live wire conductive elastic sheet is connected with the electrode elastic sheet of the live wire, the other end is a live wire contact end, one end of the zero line conductive elastic sheet is connected with the electrode elastic sheet of the zero line, the other end is a contact end of the zero line, the movable block is arranged beside the electrode spring plate of the ground wire and can slide back and forth, one end of the movable block is arranged at the electrode spring plate of the ground wire and can form a pushing contact point with the pin of the plug, the other end pushes the spring plate bracket to slide in the shell, the spring plate bracket is provided with a reset spring for pushing the spring plate bracket to reset, the two ends of the spring plate bracket are respectively fixedly connected with the live wire contact end and the zero line contact end and pull the live wire contact end and the zero line contact end to move together, the live wire live elastic sheet and the zero wire live elastic sheet are respectively in contact connection with the corresponding live wire contact end and the zero wire contact end.

In the second technical scheme, the working principle and the action of the second technical scheme are basically the same as those of the first technical scheme, the movable block of the first technical scheme is arranged at the electrode elastic sheet of the ground wire, the on-off state between the conductive elastic sheet and the charged elastic sheet is controlled through the mechanical cooperation between the movable block and the elastic sheet support, so that the charged or non-charged state of the electrode elastic sheet is realized, the movable block can be pushed to slide only after a ground wire pin of a plug is correctly inserted into the corresponding electrode elastic sheet, the elastic sheet support is pushed to slide backwards by utilizing the sliding of the movable block, the contact ends of the live wire conductive elastic sheet and the zero wire conductive elastic sheet which are fixedly arranged at the two ends of the elastic sheet support are pulled to be in contact connection with the respective live wire charged elastic sheet and the zero wire charged elastic sheet, and at the moment, the electrode elastic sheets respectively connected with the live wire charged elastic sheet and the zero wire charged elastic sheet can complete the electrification; on the contrary, after the pins of the ground wire are pulled out, the elastic sheet bracket pushes the movable block to slide forwards for resetting under the action of the reset spring, and at the moment, the two electrified electrode elastic sheets are in a non-electric state again. Through the structure improvement, the two electrode elastic sheets of the live wire and the zero wire can be electrified only after the socket is ensured to be grounded, and before the socket is not completely grounded, a single pin or a non-standard pin/conductive object is used, so that the respective conductive elastic sheets and the charged elastic sheets of the two electrode elastic sheets can not be contacted and electrified, therefore, the contact and the electrification can be completed only by simultaneously inserting the standard pins, the safety of the socket can be ensured, and the environment applicability of the socket is enhanced.

Furthermore, a buffer spring with a buffering function is arranged on the non-contact surface of the contact end of the live wire live elastic sheet and the zero wire live elastic sheet. In the preferred technical scheme, the live shell fragment of fire, zero line can produce the impact rather than the electrically conductive shell fragment of contact, and buffer spring plays certain cushioning effect to its impact just, both can guarantee the toughness of electrically conductive shell fragment, can prevent again that electrically conductive shell fragment warp after frequent contact.

Further, the method also comprises the following steps: the inner shell cover is provided with three independent isolation cabin bodies, and the three isolation cabin bodies are used for accommodating three electrode elastic sheets respectively and separating the three electrode elastic sheets from each other. In the preferred technical scheme, the three isolation bin bodies separate the electrode elastic sheets of the fire, the zero and the ground wires from each other without mutual interference, and liquid conduction can not be generated if common conducting liquid is splashed, so that the safety and the environmental adaptability of the socket can be further enhanced and improved.

Further, the method also comprises the following steps: the movable cover is arranged on the upper surface of the inner shell cover and slides back and forth, a reset spring for pushing the movable cover to reset is arranged at the rear end of the movable cover, the front end of the movable cover is a conical head, and the conical angle of the conical head is matched with the included angle formed by the two electrode elastic sheets of the fire line and the zero line and is matched with and sheltered from the pin hole of the movable cover. In the preferred technical scheme, a conical head formed by the movable cover is matched with an included angle formed by the fire pin and the zero line pin of the plug, and when the pins are inserted, the movable cover can be smoothly pushed to slide backwards to smoothly complete the insertion; otherwise, participate in the back of dialling out, the movable cover resets under its reset spring effect, shelters from the pin hole again, and the conical head of this movable cover is high with the contained angle degree of agreeing with of participating in of fire, zero line, can make it smoothly insert or dial out, can not appear blocking and dunking, and the movable cover is difficult to open, inserts the scheduling problem of difficultly, makes to insert more smoothly and laborsavingly.

Compared with the prior art, the utility model discloses utilize the principle of separation and reunion control break-make electricity, use the socket under non-user state, its electrode shell fragment is in electroless state to improve the security of socket and to the adaptability of environment, effectively reduce because of the accident that various reasons lead to leaking, electrocute takes place.

Drawings

Fig. 1 is an exploded view of an embodiment of the present invention.

Fig. 2 is an internal structure diagram of a first embodiment of the present invention.

Fig. 3 is an exploded view of the second embodiment of the present invention.

Fig. 4 is an internal structure diagram of a second embodiment of the present invention.

Description of reference numerals:

example one, 1 — a housing; 2, an accommodating cavity; 3-electrode base; 4-a chute of the electrode base; 5-a return spring; 6-a convex part; 7-conductive elastic sheet; 8, an electrified elastic sheet; 9-slot of the elastic sheet bracket; 10-a buffer spring; 11-electrode shrapnel; 12-a movable block; 13-a spring plate support; 14-inner housing cover; 15-isolating the bin body; 16-cover plate; 17-the holes of the pins are provided,

example two, 1-housing; 2, an accommodating cavity; 3-electrode base; 4-zero line conductive spring plate; 5-electrode spring of zero line; 6-electrode shrapnel of ground wire; 7-electrode spring of live wire; 8-live wire conductive spring plate; 9-slot of the elastic sheet bracket; 10-live spring plate of live wire; 11-a movable block; 12-a spring plate support; 13-live spring zero line; 14-inner housing cover; 15, accommodating the groove; 16-isolating the bin body; 17-a removable cover; 18-a cone head; 19-a return spring; 20-cover plate; 21-pin holes; f, a return spring; h-buffer spring.

Detailed Description

As shown in fig. 1 and 2, in one embodiment, the receptacle is a standard two-hole receptacle comprising: a shell 1, a containing cavity 2 is arranged in the shell, an opening is arranged at the top of the containing cavity, the opening is provided with a cover plate 16 which is covered with the opening, and the surface of the cover plate is provided with two pin holes 17 for two pins of a plug to be inserted in a matching way. Two electrode spring pieces 11 which are respectively connected with a live wire and a zero wire are arranged in the accommodating cavity, each electrode spring piece is composed of two bent copper sheets, a clamping part for inserting the pins is formed at the upper part of each electrode spring piece, and a hollow part is formed at the lower part of each electrode spring piece. The two electrode elastic sheets are fixed at the bottom of the accommodating cavity through the electrode base 3 and are respectively in one-to-one correspondence with the two pin holes on the cover plate.

Each of the electrode clips 11 further includes: the device comprises components such as a conductive elastic sheet 7, a movable block 12, an elastic sheet bracket 13, an electrified elastic sheet 8 and the like. One end of the conductive elastic sheet 7 is connected with the bottom of the electrode elastic sheet 11 for conducting electricity, the other end is a contact end which is bent and erected, and the upper part of the contact end is provided with a silver column for contact. The movable block 12 is positioned beside the electrode elastic sheet 11 and can slide back and forth on the electrode base, one end of the movable block is arranged in the hollow part of the electrode elastic sheet, and the end part is an inclined plane, so that the inclined plane can form a pushing contact point with the pins of the plug, and when the pins are inserted, the pins are pushed to slide by virtue of the inclined plane of the movable block; the other end of the movable block is in contact with one end of the spring support 13 and forms a pushing force for the spring support. The elastic sheet support 13 is in a transverse U shape, the bottom surface of the elastic sheet support is provided with a convex part 6, the convex part is arranged in a sliding groove 4 arranged on one side of the electrode base and slides in the sliding groove, and a return spring 5 is arranged between the sliding groove and the convex part and can push the elastic sheet support to reset and slide; the other end of the elastic sheet bracket is provided with a slot 9. The charged elastic sheet 8 is L-shaped, the vertical edge part of the charged elastic sheet is provided with a contact silver column, and the contact silver column is inserted into the slot 9 of the elastic sheet bracket to be fixed, the contact silver column of the charged elastic sheet corresponds to the contact silver column of the conductive elastic sheet and can be in contact connection and electrified, and the horizontal edge part of the charged elastic sheet is connected with a power line.

The conductive elastic sheet, the movable block, the elastic sheet bracket and the electrified elastic sheet between the two electrode elastic sheets 11 are arranged in a reverse installation manner and are in contact connection with each other in a motion in the opposite direction.

The back (i.e. the non-contact surface) of the contact end of the conductive elastic sheet 7 is provided with a buffer spring 10 for buffering.

Still be equipped with an inner housing cover 14 in foretell holding cavity 2, this inner housing cover is located the top of electrode base, and inner housing cover still is equipped with two independent isolation storehouse body 15, and these two isolation storehouse body overlap respectively on two electrode shell fragments and supply its holding to separate two electrode shell fragments, every electrode shell fragment is surrounded by an isolation storehouse body promptly, makes mutual noninterference and not influenced each other between the electrode shell fragment.

In another embodiment, shown in fig. 3 and 4, the receptacle is a standard three-jack receptacle comprising: the plug comprises a shell 1, wherein a containing cavity 2 is arranged in the shell, an opening is arranged at the top of the containing cavity, the opening is provided with a cover plate 20 which is covered with the opening, and three pin holes 21 for inserting three pins of a plug in a matching way are arranged on the cover plate. Three electrode elastic sheets which are arranged in a triangular mode are arranged in the accommodating cavity and are respectively provided with electrode elastic sheets 7, 5 and 6 of a live wire, a zero wire and a ground wire, each electrode elastic sheet is composed of two bent copper sheets, a clamping portion for inserting the pins is formed at the upper portion of each electrode elastic sheet, and a hollow portion is formed at the lower portion of each electrode elastic sheet. The three electrode elastic sheets are fixed at the bottom of the accommodating cavity 2 through the electrode base 3 and are respectively in one-to-one correspondence with the three pin holes on the cover plate.

The accommodating cavity 2 further comprises: the live wire elastic sheet comprises a live wire conductive elastic sheet 8, a zero line conductive elastic sheet 4, a movable block 11, an elastic sheet support 12, a live wire elastic sheet 10 and a zero line live elastic sheet 13. The live wire conductive elastic sheet 8 and the zero line conductive elastic sheet 4 are both L-shaped, one end of the live wire conductive elastic sheet is connected with the electrode elastic sheet 7 of the live wire, the other end of the live wire conductive elastic sheet is a bent and erected live wire contact end, and the upper part of the live wire contact end is provided with a contact silver column; one end of the zero line conductive elastic sheet 4 is connected with an electrode elastic sheet 5 of the zero line, the other end is a bent and erected zero line contact end, and the upper part of the zero line contact end is also provided with a contact silver column. The movable block 11 is arranged beside the electrode elastic sheet 6 of the ground wire and can slide back and forth, one end of the movable block is arranged in the hollow part of the electrode elastic sheet of the ground wire, the end part is an inclined plane, the inclined plane can form a pushing contact point with the plug pins, when the corresponding plug pins are inserted, the movable block is pushed to slide by means of the inclined plane of the movable block, the other end of the movable block is in contact with the middle part of the elastic sheet support 12, and a pushing force is formed on the movable block to enable the movable block to slide backwards. The spring plate support 12 is in a transverse n shape, two sides of the spring plate support are like arm parts, the spring plate support is arranged on the electrode base 3 and can slide back and forth on the electrode base, a reset spring F is arranged below the middle part of the spring plate support, a figure 4 shows that the reset spring is matched with the electrode base to play a role in sliding and resetting the spring plate support, slots 9 are arranged at two ends of the spring plate support and are respectively used for inserting and fixing a live wire contact end and a zero wire contact end and pulling the live wire contact end and the zero wire contact end to move together when the spring plate support slides. The live wire elastic sheet 10 and the zero line live elastic sheet 13 are also L-shaped, the vertical edge parts of the live wire elastic sheet and the zero line live elastic sheet are also provided with contact silver columns which are in contact connection with the corresponding contact ends of the live wire and the zero line respectively, and the horizontal edge parts of the live wire live elastic sheet and the zero line live elastic sheet are respectively connected with a live wire power line and a zero line power line.

The back (i.e. non-contact surface) of the contact end of the live wire live spring plate 10 and the zero wire live spring plate 13 is provided with a buffer spring H for buffering.

Still be equipped with an inner casing cover 14 in foretell holding cavity 2, this inner casing cover is located the top of electrode base, and the inner casing is equipped with the three independent isolation storehouse body 16, and this three isolation storehouse body overlaps respectively on above-mentioned three electrode shell fragment 5, 6, 7 and supplies its holding to separate three electrode slice, every electrode shell fragment is enclosed by an isolation storehouse body promptly, makes mutual noninterference and not influenced each other between the electrode shell fragment. The upper surface of the inner housing 14 is further provided with a receiving groove 15, and a movable cover 17 is embedded in the receiving groove and can slide back and forth in the receiving groove.

Two sides of the rear end of the movable cover 17 are respectively provided with a symmetrical reset spring 19, one end of the reset spring is sleeved on the column body of the movable cover, and the other end of the reset spring is abutted against the groove wall of the accommodating groove, so that the sliding reset of the movable cover is realized; the front end of movable cover is cone 18, the conical angle of this cone coincide with the contained angle that two electrode shell fragment of fire, zero line take shape, and participate in with the fire of plug, zero line and correspond, in addition, the cone is partly sheltered from to these two pin holes formation, when the fire of plug, when the zero line is participated in, can participate in with fire, zero line with the help of the both sides hypotenuse of cone and smoothly insert, promote the movable cover and slide backward, reduce the barrier force of movable cover when inserting the pin, save the dynamics of inserting.

Claims (8)

1. A safety receptacle, comprising: casing (1), the inside of casing is equipped with two electrode shell fragments, the outside of casing be equipped with respectively with two electrode shell fragments one-to-one participate in the hole, characterized by, every electrode shell fragment still include: the electric connector comprises an electric conduction elastic sheet, a movable block, an elastic sheet support and an electrified elastic sheet, wherein one end of the electric conduction elastic sheet is connected with the electrode elastic sheet, the other end of the electric conduction elastic sheet is a contact end, the movable block is arranged beside the electrode elastic sheet and can slide back and forth, one end of the movable block is arranged at the electrode elastic sheet and can form a contact point with the plug pins to push, the other end of the movable block is in contact with one end of the elastic sheet support and pushes the elastic sheet support to slide in a shell, the elastic sheet support is provided with a reset spring for pushing the elastic sheet support to reset, the other end of the elastic sheet support is connected with the electrified elastic sheet, and the electrified elastic sheet can be connected with the contact end of the electric conduction elastic sheet under the pulling of the elastic sheet support.

2. The safety socket according to claim 1, wherein the conductive spring, the movable block, the spring support and the charged spring between the two electrode springs are installed and moved in opposite directions.

3. The safety jack of claim 1, further comprising: the inner shell cover is provided with two independent isolation cabin bodies, and the two isolation cabin bodies can be respectively used for accommodating the two electrode elastic sheets and separating the two electrode elastic sheets from each other.

4. The safety socket according to claim 1, wherein the non-contact surface of the contact end of the conductive elastic sheet is further provided with a buffer spring for buffering.

5. A safety receptacle, comprising: casing (1), the inside of casing is equipped with three electrode shell fragment, the outside of casing be equipped with respectively with the hole of participating in of three electrode shell fragment one-to-one, characterized by still includes: a live wire conductive elastic sheet, a zero line conductive elastic sheet, a movable block, an elastic sheet bracket, a live wire electrified elastic sheet and a zero line electrified elastic sheet, one end of the live wire conductive elastic sheet is connected with the electrode elastic sheet of the live wire, the other end is a live wire contact end, one end of the zero line conductive elastic sheet is connected with the electrode elastic sheet of the zero line, the other end is a contact end of the zero line, the movable block is arranged beside the electrode spring plate of the ground wire and can slide back and forth, one end of the movable block is arranged at the electrode spring plate of the ground wire and can form a pushing contact point with the pin of the plug, the other end pushes the spring plate bracket to slide in the shell, the spring plate bracket is provided with a reset spring for pushing the spring plate bracket to reset, the two ends of the spring plate bracket are respectively connected with the live wire contact end and the zero line contact end and pull the live wire contact end and the zero line contact end to move together, the live wire live elastic sheet and the zero wire live elastic sheet are respectively in contact connection with the corresponding live wire contact end and the zero wire contact end.

6. The safety socket according to claim 5, wherein the non-contact surface of the contact end of the live spring and the neutral spring is further provided with a buffer spring for buffering.

7. The safety jack of claim 5, further comprising: the inner shell cover is provided with three independent isolation cabin bodies, and the three isolation cabin bodies are used for accommodating three electrode elastic sheets respectively and separating the three electrode elastic sheets from each other.

8. The safety jack of claim 7, further comprising: the movable cover is arranged on the upper surface of the inner shell cover and slides back and forth, a reset spring for pushing the movable cover to reset is arranged at the rear end of the movable cover, the front end of the movable cover is a conical head, and the conical angle of the conical head is matched with the included angle formed by the two electrode elastic sheets of the fire line and the zero line and is matched with and sheltered from the pin hole of the movable cover.

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