Arc extinguishing tube assembly without disconnection and connection

Abstract

The present invention relates to an arc-extinguishing tube assembly that does not require detachment or hanging, wherein one end of a conductive rod is connected to a falling upper contact at the upper end of the arc-extinguishing tube, and the other end is connected to a contact seat, a tension spring is provided at the lower part of the arc-extinguishing tube, and a contact finger connecting rod is provided on one side of the contact finger seat and connected to the tension spring, one end of a conductive belt is connected to the contact finger connecting rod, and the other end is connected to a falling lower contact at the lower end of the arc-extinguishing tube, a melt tube cabin is provided on one side of the arc-extinguishing tube, and the melt tubes are driven to be output one by one by a spring provided in the melt tube cabin, the melt of the melt tube is provided in an insulating tube and one end is fixedly connected to the upper contact of the melt tube, and the other end is fixedly connected to the lower contact of the melt tube, after the melt tube is output from the melt tube cabin, the upper contact of the melt tube enters the contact chute of the contact seat, the lower contact of the melt tube is engaged by the contact finger on the contact finger seat, and an opening is provided on the arc-extinguishing tube at a position corresponding to the contact chute. When the melt tube in the melt tube cabin is not completely consumed, the invention does not require the arc extinguishing tube to be removed or hung to perform the melt replacement operation.

Description

Technical Field

[0001] The invention relates to the field of power protection devices, in particular to an arc-extinguishing tube assembly which does not require detachment or hanging. Background Art

[0002] A drop-out fuse is a commonly used outdoor high-voltage fuse. It usually includes structures such as insulators and arc-extinguishing tubes to achieve overload and short-circuit protection for lines or power transformers. For example, the Chinese invention patent with publication number CN115954244A discloses an AC outdoor high-voltage drop-out fuse, which includes structures such as insulators and arc-extinguishing tubes. However, this fuse is mainly used to avoid the upper moving contact and the upper static contact from sticking together when an overcurrent is generated by an equipment failure, resulting in the arc-extinguishing tube being unable to drop normally. The Chinese invention patent with authorization announcement number CN104752115B discloses a simple load breaker for a PRW type drop-out fuse. A fuse upper winding seat and a fuse lower winding seat are provided in the arc-extinguishing tube, and the two ends of the lead fuse are respectively wound on the corresponding winding seats. When the system is overloaded, the current is much greater than the set value, thereby causing the lead fuse to melt.

[0003] Normally, when the fuse of a drop-out type fuse is replaced, it is necessary to use an insulating rod to remove and hang the arc-extinguishing tube assembly to realize the operation of replacing the fuse. For example, in the above-mentioned CN104752115B patent, it is necessary to use an insulating operating rod to hook the copper ring on the upper end of the arc-extinguishing tube to realize the arc-extinguishing tube removal and hanging function. However, the installation position of the drop-out type fuse is relatively high, and the arc-extinguishing tube assembly will swing left and right when removed and hung, which is very inconvenient to operate. In addition, the arc-extinguishing tube assembly can easily fall off and cause problems such as damage to the transformer or even injury to people. The entire fuse replacement process is time-consuming and labor-intensive. Therefore, if a structure can be designed that can replace the fuse without removing and hanging the arc-extinguishing tube, it will undoubtedly solve the above problems.

[0004] However, how to ensure the output of the fuse after melting and the reinstallation of the new fuse is a problem that needs to be considered. The structural design of the fuse tube in the existing technology is more concerned with safety performance. For example, the CN205159273U patent discloses an anti-burst fuse tube, one end of which is provided with a pressure release cap with a one-way valve plate to release the airflow pressure generated when the fuse is melted. In addition, the methods of conveniently replacing the fuse in the existing technology are also mostly based on the installation structure. For example, the CN206516596 patent discloses a quick installation and replacement fuse type high-voltage fuse, which is provided with a quick replacement fuse component. The quick replacement fuse component consists of a spring, a curled edge anti-slip pad, and a butterfly nut. Due to the design of the quick replacement fuse component, the staff only needs to lightly twist it by hand to install or replace a fuse, but this structure still requires the arc-extinguishing tube to be removed and hung to achieve the above operation. Summary of the Invention

[0005] The object of the present invention is to provide an arc-extinguishing tube assembly that does not need to be detached or hung. When the melt in the previous melt tube is melted, the melt tube can be automatically separated and output, and the next melt tube is automatically replaced. Therefore, when the melt tubes in the melt tube cabin are not completely consumed, the present invention does not need to detach or hang the arc-extinguishing tube to replace the melt.

[0006] The object of the present invention is achieved through the following technical solutions:

[0007] An arc-extinguishing tube assembly that does not require detachment and hanging, comprising an arc-extinguishing tube, a melt tube and a melt tube cabin, wherein a conductive rod, a contact seat, a contact finger seat and a conductive belt are provided in the arc-extinguishing tube, one end of the conductive rod is connected to a drop-down upper contact provided at the upper end of the arc-extinguishing tube, and the other end is connected to the contact seat, a tension spring is provided at the lower part of the arc-extinguishing tube, and a contact finger connecting rod is provided on one side of the contact finger seat and connected to the tension spring, one end of the conductive belt is connected to the contact finger connecting rod, and the other end is connected to a drop-down lower contact provided at the lower end of the arc-extinguishing tube, the melt tube cabin is provided on one side of the arc-extinguishing tube, the melt tube is provided in the melt tube cabin and is connected to the drop-down lower contact provided at the lower end of the arc-extinguishing tube, The melt tube is driven one by one by a spring arranged in the melt tube cabin. The melt tube includes an upper contact of the melt tube, a lower contact of the melt tube, an insulating tube and a melt, wherein the melt is arranged in the insulating tube and one end is fixedly connected to the upper contact of the melt tube and the other end is fixedly connected to the lower contact of the melt tube. A contact chute is provided on the contact seat, and a plurality of contact fingers are provided on the contact finger seat. After the melt tube is output from the melt tube cabin, the upper contact of the melt tube enters the contact chute, and the lower contact of the melt tube is engaged by each contact finger. An opening is provided on the arc extinguishing tube at a position corresponding to the contact chute.

[0008] A spring and a top plate are provided in the melt tube cabin, wherein one side of the top plate is connected to the inner wall of the closed end of the melt tube cabin through the spring, and the other side of the top plate abuts against the adjacent melt tube.

[0009] The tension spring is arranged outside the arc extinguishing tube, and the upper end of the tension spring is connected to the contact finger seat through the contact finger connecting rod. A sliding groove for the contact finger connecting rod to pass through is provided on the arc extinguishing tube, and the lower end of the tension spring is fixed on the arc extinguishing tube.

[0010] A push-pull ring is provided at one end of the finger contact link away from the finger contact seat, a tension spring connecting ring is provided at the middle of the finger contact link, and the upper end of the tension spring is connected to the tension spring connecting ring.

[0011] A shield is provided on the outside of the contact finger seat, and the shield is arranged in the arc extinguishing tube. When the drop-out fuse is in the closed state, the opening and the slide groove on the arc extinguishing tube are blocked by the shield.

[0012] The shield is fixedly connected to the contact finger seat, one end of the contact finger link inserted into the arc extinguishing tube is provided with a connecting block, and the connecting block is fixedly connected to the shield, and the conductive belt is arranged in the arc extinguishing tube and one end is fixedly connected to the connecting block.

[0013] A through hole for the insulating tube to pass through is provided in the contact finger seat.

[0014] The contact finger is made of elastic copper alloy material, and the lower end surface of the melt tube lower contact is a spherical surface.

[0015] The contact on the melt tube is in the shape of a disc that rolls along a contact slot on the contact seat.

[0016] A contact hinge seat is provided at the lower end of the arc-extinguishing tube, and one end of the dropped lower contact is hinged to the contact hinge seat.

[0017] The advantages and positive effects of the present invention are:

[0018] 1. According to the present invention, after the melt in the previous melt tube is melted, the contact finger seat automatically falls down under the action of the tension spring and pulls the melt tube lower contact of the melt tube together with the insulating tube to fall and output. At the same time, the next melt tube in the melt chamber is automatically output due to no obstruction. When the upper contact of the melt tube left in the contact seat of the previous melt tube is pushed out from the opening on the arc extinguishing tube, the automatic filling of the next melt tube is also realized. Therefore, the present invention does not need to remove the arc extinguishing tube to replace the melt when the melt tube in the melt tube chamber is not completely consumed. After the next melt tube is filled, the operator only needs to pull the contact finger connecting rod to drive the contact finger seat to move, and make the contact fingers on the contact finger seat re-engage the melt tube lower contact at the lower end of the new melt tube. Then, the arc extinguishing tube can be directly lifted to perform the closing operation, and the whole operation is simpler and more convenient.

[0019] 2. The present invention stores melt tubes in a melt tube cabin provided on one side of the arc extinguishing tube, and a spring and a top plate are provided in the melt tube cabin. When the previous melt tube melts, the next melt tube can be automatically output to fill the position under the action of the spring and the top plate. The entire structure is simple and compact, and the manufacturing cost is low. At the same time, it will not increase the volume and weight of the arc extinguishing tube too much, and thus will not affect the normal use of the arc extinguishing tube. At the same time, the present invention can ensure that the melt tube is accurately positioned, thereby ensuring its conductive connection with the contact seat and accurate engagement with the contact finger seat during subsequent closing.

[0020] 3. The contact fingers on the contact finger holder of the present invention are made of elastic copper alloy (such as phosphor bronze, beryllium bronze, etc.), and the lower end surface of the lower contact of the melt tube is designed to be spherical. In this way, when the contact finger holder contacts the new melt tube, its contact fingers can automatically open and get stuck along the spherical surface of the lower contact of the melt tube, which is convenient for operation. In addition, the upper contact of the melt tube is designed to be a disc shape that can roll along the contact groove on the contact holder. This ensures that it can be hung on the contact holder when closing the circuit breaker, and also ensures that it can automatically roll out under the push of the upper contact of the melt of the next melt tube when melting, without problems such as jamming, thereby ensuring the smooth replacement of the melt tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a decomposition diagram of the present invention,

[0022] Figure 2 for Figure 1 Schematic diagram of the melt tube.

[0023] Figure 3 for Figure 2 Schematic diagram of the melt tube.

[0024] Figure 4 This is a schematic diagram of the use of the present invention Figure 1 ,

[0025] Figure 5 for Figure 4 A partial enlarged view of the middle melt pipe cabin.

[0026] Figure 6 This is a schematic diagram of the use of the present invention Figure 2 ,

[0027] Figure 7 for Figure 6 A partial enlarged view of the middle melt pipe cabin.

[0028] Figure 8 This is a schematic diagram of the use of the present invention Figure 3 ,

[0029] Figure 9 This is a schematic diagram of the use of the present invention Figure 4 ,

[0030] Figure 10 for Figure 9 A partial enlarged view of the middle melt tube cabin.

[0031] Among them, 1 is the melt tube, 101 is the upper contact of the melt tube, 102 is the lower contact of the melt tube, 103 is the insulating tube, 104 is the melt, 2 is the arc extinguishing tube, 201 is the upper drop contact, 202 is the lower drop contact, 203 is the contact hinge seat, 204 is the opening, 205 is the slide, 3 is the contact seat, 301 is the contact slide, 4 is the conductive rod, 5 is the contact finger seat, 501 is the contact finger, 6 is the protective cover, 7 is the contact finger connecting rod, 701 is the push-pull ring, 702 is the tension spring connecting ring, 8 is the conductive belt, 9 is the tension spring, 10 is the melt tube cabin, 11 is the spring, and 12 is the top plate. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figures 1 to 10 As shown, the present invention includes an arc-extinguishing tube 2, a melt tube 1 and a melt tube cabin 10, wherein a conductive rod 4, a contact seat 3, a contact finger seat 5 and a conductive belt 8 are provided in the arc-extinguishing tube 2, one end of the conductive rod 4 is connected to the falling upper contact 201 provided at the upper end of the arc-extinguishing tube 2, and the other end is connected to the contact seat 3, a tension spring 9 is sleeved on the outer side of the lower part of the arc-extinguishing tube 2, and the upper end of the tension spring 9 is connected to the contact finger seat 5 through a contact finger connecting rod 7, a slide groove 205 for the contact finger connecting rod 7 to pass through is provided on the arc-extinguishing tube 2, one end of the conductive belt 8 is connected to the contact finger connecting rod 7, and the other end is connected to the falling lower contact 202 provided at the lower end of the arc-extinguishing tube 2, the lower end of the tension spring 9 is fixed on the arc-extinguishing tube 2, the melt tube cabin 10 is provided on one side of the middle part of the arc-extinguishing tube 2, and the melt tubes 1 are output one by one from the inside of the melt tube cabin 10, as shown Figures 2-3 As shown, the melt tube 1 includes an upper melt tube contact 101, a lower melt tube contact 102, an insulating tube 103 and a melt 104, wherein the insulating tube 103 is fixedly connected to the lower melt tube contact 102, and the melt 104 is arranged in the insulating tube 103, and one end of the melt 104 is fixedly connected to the upper melt tube contact 101 and the other end is fixedly connected to the lower melt tube contact 102. In this way, when the melt 104 is melted, the lower melt tube contact 102 is no longer connected to the upper melt tube contact 101 through the melt 104, and the insulating tube 103 together with the lower melt tube contact 102 can be separated from the upper melt tube contact 101, as shown in FIG. Figure 1As shown, the contact seat 3 is provided with a contact chute 301, and the contact finger seat 5 is provided with multiple contact fingers 501. After the melt tube 1 is output from the melt tube cabin 10, the melt tube upper contact 101 of the melt tube 1 enters the contact chute 301 to achieve connection with the contact seat 3, and the melt tube lower contact 102 of the melt tube 1 is engaged with each contact finger 501 to achieve connection with the contact finger seat 5, and a through hole is provided in the contact finger seat 5 for the insulating tube 103 to pass through when it falls off, and an opening 204 for the output of the melt tube upper contact 101 is provided at a position corresponding to the contact chute 301 on the arc extinguishing tube 2.

[0034] When the drop-out fuse is in the closed state, Figures 4-5 As shown, at this time, the conductive belt 8 tightens the dropped lower contact 202, and the dropped upper contact 201, the conductive rod 4, the contact seat 3, the melt tube 1, the contact finger seat 5, the contact finger connecting rod 7, the conductive belt 8, and the dropped lower contact 202 form a conductive loop.

[0035] When the line is overloaded or short-circuited, the melt 104 inside the melt tube 1 melts, causing the upper contact 101 and the lower contact 102 of the melt tube to no longer be connected through the melt 104. Figures 6-7 As shown, the finger holder 5 automatically moves downward under the action of the tension spring 9, driving the lower contact 102 of the melt tube together with the insulating tube 103 to fall and separate from the upper contact 101 of the melt tube, and finally outputted from the lower opening of the arc-extinguishing tube 2 under the action of gravity. At this time, the next melt tube 1 in the melt chamber 10 is automatically outputted due to no obstruction, and the upper contact 101 of the melt tube left in the contact holder 3 of the previous melt tube 1 is pushed out from the opening 204 on the arc-extinguishing tube 2, as shown in FIG. Figures 8-9 As shown, at this time, the lower contact 202 is reversed because it is no longer under the pulling force of the conductive belt 8, thereby causing the entire arc-extinguishing tube 2 to reverse and fall.

[0036] When the operator needs to close the circuit breaker, Figures 9-10 As shown, it is only necessary to use an insulating rod or other tool to pull the contact finger connecting rod 7 downward to drive the contact finger seat 5 to move, and make the contact finger 501 on the contact finger seat 5 re-engage the melt tube lower contact 102 at the lower end of the new melt tube 1, without having to remove the arc extinguishing tube 2 for fuse replacement and other operations, and then use an insulating rod or other tool to directly push and lift the arc extinguishing tube 2 to achieve closing. In this embodiment, the contact finger 501 is made of a copper alloy with elasticity (such as phosphor bronze, beryllium copper, etc.), and the lower end surface of the melt tube lower contact 102 is designed to be spherical, so that Figure 10 As shown, when the finger holder 5 contacts the new melt tube 1, its finger 501 can automatically open along the spherical surface of the melt tube lower contact 102, and can automatically close after the hook at the head end of the finger 501 passes over the melt tube lower contact 102 to clamp the melt tube lower contact 102. Figures 1 to 3 As shown, the upper contact 101 of the melt tube is designed to be in the shape of a disc that can roll along the contact slot 301 on the contact base 3. This ensures that it can be hooked on the contact base 3 when the circuit breaker is closed, and also ensures that it can automatically roll out under the push of the upper contact 101 of the melt tube of the next melt tube 1 when the fuse is blown, avoiding problems such as sticking.

[0037] like Figures 1 to 10 As shown, in this embodiment, a spring 11 and a top plate 12 are provided in the melt tube cabin 10, wherein one side of the top plate 12 is connected to the inner wall of the closed end of the melt tube cabin 10 through the spring 11, and the other side of the top plate 12 is against the adjacent melt tube 1. When the previous melt tube 1 is melted and separated and output, the next melt tube 1 is automatically output by pushing the top plate 12 through the spring 11. When all the melt tubes 1 in the melt tube cabin 10 are output, the operator removes the arc-extinguishing tube 2 and replenishes the new melt tube 1. In addition, in this embodiment, a limiting groove is provided in the melt tube cabin 10 to connect with the contact slide 301, so that the contact 101 on the melt tube of each melt tube 1 can move along the limiting groove and accurately enter the contact slide 301. After entering the arc-extinguishing tube 2, the other side of the new melt tube 1 is limited in displacement by the inner wall of the arc-extinguishing tube 2, and as shown Figure 1 As shown, mounting blocks are provided on both sides of the output port of the melt tube cabin 10, and the mounting blocks are fixed to the arc extinguishing tube 2 by bolts. After the mounting blocks are removed, the melt tube cabin 10 can be separated from the arc extinguishing tube 2 and the melt tube 1 can be replenished into the melt tube cabin 10.

[0038] like Figures 1 to 10 As shown, in this embodiment, one end of the contact finger link 7 passes through the slide groove 205 on the arc-extinguishing tube 2 and is fixedly connected to the contact finger seat 5. The other end of the contact finger link 7 is provided with a push-pull ring 701. The operator can use a tool to push the push-pull ring 701 to perform corresponding operations. The slide groove 205 can play a role in moving and guiding. In addition, a tension spring connecting ring 702 is provided in the middle of the contact finger link 7, and the upper end of the tension spring 9 is hung and fixed on the tension spring connecting ring 702.

[0039] like Figures 1 to 10 As shown, in this embodiment, a shield 6 is provided outside the contact finger seat 5, and the shape of the shield 6 matches the inner wall of the arc-extinguishing tube 2. When the drop-out fuse is in the closed state, as shown in FIG. Figure 5 As shown, the shield 6 completely blocks the opening 204 and the slide groove 205 on the arc-extinguishing tube 2 to prevent external impurities from entering.

[0040] like Figure 1 and Figure 5As shown, in this embodiment, the shield 6 is fixedly connected to the contact finger seat 5 by bolts, the contact finger link 7 is inserted into the arc extinguishing tube 2 at one end thereof and is provided with a connecting block, and the connecting block is fixedly connected to the shield 6, and the conductive belt 8 is provided in the arc extinguishing tube 2 and one end thereof is fixedly connected to the connecting block.

[0041] like Figure 1 As shown, the lower end of the arc-extinguishing tube 2 is provided with a contact hinge seat 203, as shown in FIG. Figure 4 As shown, one end of the dropped lower contact 202 is fixedly connected to the lower end of the fuse insulator, and the other end is hinged to the contact hinge seat 203. The dropped upper contact 201 is embedded in the upper end of the fuse insulator to achieve closing. The structures of the dropped upper contact 201 and the dropped lower contact 202 are both well-known technologies in the field.

[0042] The working principle of the present invention is:

[0043] When the drop-out fuse is in the closed state, Figures 4-5 As shown, at this time, the dropped upper contact 201, the conductive rod 4, the contact seat 3, the melt tube 1, the contact finger seat 5, the contact finger connecting rod 7, the conductive belt 8, and the dropped lower contact 202 form a conductive loop.

[0044] When the circuit is overloaded or short-circuited, the melt 104 inside the melt tube 1 melts, causing the upper contact 101 and the lower contact 102 of the melt tube to no longer be connected through the melt 104. Figures 6-7 As shown, the contact finger seat 5 automatically moves downward under the action of the tension spring 9 and drives the lower contact 102 of the melt tube together with the insulating tube 103 to fall and be output. At this time, the next melt tube 1 in the melt chamber 10 is automatically output due to no obstruction, and the upper contact 101 of the melt tube left in the contact seat 3 of the previous melt tube 1 is pushed out from the opening 204 on the arc-extinguishing tube 2. At this time, the new melt tube 1 is placed in the contact chute 301 on the contact seat 3 through the upper contact 101 of the melt tube to achieve hanging, and as shown in FIG. Figures 8-9 As shown, at this time, the lower contact 202 is reversed because it is no longer pulled by the conductive belt 8, thereby causing the entire arc-extinguishing tube 2 to reverse and fall.

[0045] When the operator closes the circuit breaker, Figures 9-10 As shown, it is only necessary to use a tool such as an insulating rod to pull the contact finger link 7 downward to drive the contact finger seat 5 to move, and make the contact finger 501 on the contact finger seat 5 re-engage the lower melt tube contact 102 at the lower end of the new melt tube 1. There is no need to remove the arc-extinguishing tube 2 for fuse replacement and other operations, and then use a tool such as an insulating rod to directly push and lift the arc-extinguishing tube 2 so that the dropped upper contact 201 is embedded in the upper end of the fuse insulator to achieve closing.

[0046] In addition, the melt tube 1 of the present invention can be quickly separated after the melt 104 is melted, and the airflow pressure generated by the melting of the melt 104 can be quickly released while ensuring output, ensuring safe use. The airflow pressure generated by the melting of the melt 104 is a well-known technology in the art. For example, Patent CN 205159273U designs an explosion-proof fuse tube to address this problem.

Claims

1. An arc-extinguishing tube assembly that does not require removal or hanging, characterized by: The invention comprises an arc-extinguishing tube (2), a melt tube (1) and a melt tube cabin (10), wherein a conductive rod (4), a contact seat (3), a contact finger seat (5) and a conductive belt (8) are provided in the arc-extinguishing tube (2), one end of the conductive rod (4) is connected to a falling upper contact (201) provided at the upper end of the arc-extinguishing tube (2), and the other end is connected to the contact seat (3), a tension spring (9) is provided at the lower part of the arc-extinguishing tube (2), and a contact finger connecting rod (7) is provided on one side of the contact finger seat (5) and is connected to the tension spring (9), one end of the conductive belt (8) is connected to the contact finger connecting rod (7), and the other end is connected to a falling lower contact (202) provided at the lower end of the arc-extinguishing tube (2), the melt tube cabin (10) is provided on one side of the arc-extinguishing tube (2), the melt tube (1) is provided in the melt tube cabin (10) and is driven one by one by a spring (11) provided in the melt tube cabin (10). An output, the melt tube (1) comprises a melt tube upper contact (101), a melt tube lower contact (102), an insulating tube (103) and a melt (104), wherein the melt (104) is arranged in the insulating tube (103) and one end of the melt tube upper contact (101) is fixedly connected to the melt tube lower contact (102), and the other end of the melt (104) is fixedly connected to the melt tube lower contact (102), the contact seat (3) is provided with a contact slot (301), and the contact finger A plurality of contact fingers (501) are provided on the seat (5); after the melt tube (1) is output from the melt tube cabin (10), the upper contact (101) of the melt tube (1) enters the contact chute (301); the lower contact (102) of the melt tube (1) is engaged by each contact finger (501); and an opening (204) is provided on the arc extinguishing tube (2) at a position corresponding to the contact chute (301).

2. The arc-extinguishing tube assembly according to claim 1, characterized in that: A spring (11) and a top plate (12) are provided in the melt tube cabin (10), wherein one side of the top plate (12) is connected to the inner wall of the closed end of the melt tube cabin (10) through the spring (11), and the other side of the top plate (12) is against the adjacent melt tube (1).

3. The arc-extinguishing tube assembly according to claim 1, characterized in that: The tension spring (9) is arranged outside the arc-extinguishing tube (2), and the upper end of the tension spring (9) is connected to the contact finger seat (5) through the contact finger connecting rod (7). A sliding groove (205) for the contact finger connecting rod (7) to pass through is provided on the arc-extinguishing tube (2), and the lower end of the tension spring (9) is fixed on the arc-extinguishing tube (2).

4. The arc-extinguishing tube assembly according to claim 3, characterized in that: A push-pull ring (701) is provided at one end of the finger contact link (7) away from the finger contact seat (5), a tension spring connecting ring (702) is provided in the middle of the finger contact link (7), and the upper end of the tension spring (9) is connected to the tension spring connecting ring (702).

5. The arc-extinguishing tube assembly according to claim 3, characterized in that: A protective cover (6) is provided on the outside of the contact finger seat (5), and the protective cover (6) is arranged in the arc extinguishing tube (2). When the drop-out fuse is in a closed state, the opening (204) and the sliding groove (205) on the arc extinguishing tube (2) are blocked by the protective cover (6).

6. The arc-extinguishing tube assembly according to claim 5, characterized in that: The shield (6) is fixedly connected to the contact finger seat (5); one end of the contact finger link (7) inserted into the arc extinguishing tube (2) is provided with a connection block, and the connection block is fixedly connected to the shield (6); the conductive belt (8) is provided in the arc extinguishing tube (2) and one end is fixedly connected to the connection block.

7. The arc-extinguishing tube assembly according to claim 1, characterized in that: A through hole for the insulating tube (103) to pass through is provided in the contact finger seat (5).

8. The arc-extinguishing tube assembly according to claim 1, characterized in that: The contact finger (501) is made of a copper alloy material with elasticity, and the lower end surface of the melt tube lower contact (102) is a spherical surface.

9. The arc-extinguishing tube assembly according to claim 1, characterized in that: The contact (101) on the melt tube is in the shape of a disc that rolls along a contact chute (301) on the contact seat (3).

10. The arc-extinguishing tube assembly according to claim 1, characterized in that: A contact hinge seat (203) is provided at the lower end of the arc-extinguishing tube (2), and one end of the dropped lower contact (202) is hinged to the contact hinge seat (203).

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