CN114188831B

CN114188831B - Low-voltage switch cabinet for circuit protection

Info

Publication number: CN114188831B
Application number: CN202210136784.5A
Authority: CN
Inventors: 任峰峰; 万云风; 禹化彬
Original assignee: Shandong Wanhai Electric Technology Co ltd
Current assignee: Shandong Wanhai Electric Technology Co ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-04-26
Anticipated expiration: 2042-02-15
Also published as: CN114188831A

Abstract

The invention provides a low-voltage switch cabinet for circuit protection, which relates to the technical field of switch cabinets and comprises a cabinet body, wherein circuit equipment and a protection assembly are arranged in the cabinet body, the protection assembly comprises an installation block, the protection assembly is connected with the circuit equipment through a first wiring end and a second wiring end, a driving piece is arranged on the installation block, the driving piece is connected with a moving block, a strip-shaped block is arranged on the installation block, a strip-shaped chute sliding with the moving block is formed in the strip-shaped block, the driving piece controls the moving block to move up and down in the strip-shaped chute, an arc-shaped pipe is arranged on the outer side of the strip-shaped chute, a first sliding block and a second sliding block connected with the moving block are arranged in the arc-shaped pipe in a sliding mode, the first sliding block and the second sliding block are respectively provided with the first wiring end and the second wiring end, and the first wiring end and the second wiring end are connected through a fuse wire. The invention is convenient for connecting the first terminal with the second terminal without manual work after the fuse between the first terminal and the second terminal is burnt off, and is also convenient for protecting circuit equipment.

Description

Low-voltage switch cabinet for circuit protection

Technical Field

The invention relates to the technical field of switch cabinets, in particular to a low-voltage switch cabinet for circuit protection.

Background

A switchgear is an electrical apparatus. The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of power generation, power transmission, power distribution and electric energy conversion of an electric power system.

Patent No. CN202011618070.5 discloses an XL21 switch board with circuit protection function, which can sense the temperature rise, turn on a cooling device to cool down and cool down, and protect each circuit, so as to avoid fault or short circuit due to over-high temperature, but the applicant finds that the cabinet body is only cooled down, and the circuit can be damaged after short circuit, and in addition, the cabinet body is connected with an external refrigerator through a delivery pipe after being arranged, so that the cost can be higher after use.

Disclosure of Invention

In view of the above, the present invention is directed to a low-voltage switch cabinet for circuit protection, which is designed to solve all or one of the problems of the background art.

Based on the above purpose, the invention provides a low-voltage switch cabinet for circuit protection, which comprises a cabinet body, wherein circuit equipment and a protection assembly are arranged in the cabinet body, the protection assembly comprises a mounting block, a first wiring end and a second wiring end, the protection assembly is connected with the circuit equipment through the first wiring end and the second wiring end, a driving motor is arranged on the mounting block, the output end of the driving motor is connected with a rotating disc through a driving rotating shaft, an eccentric shaft is arranged at the eccentric position on the rotating disc, the eccentric shaft is connected with a moving block through a driving arm, a strip-shaped block is arranged on the mounting block, a strip-shaped sliding groove is formed in the strip-shaped block, the moving block is connected in the strip-shaped sliding groove in a sliding manner, an arc-shaped pipe is arranged at the outer side of the strip-shaped sliding groove, and a first sliding block and a second sliding block are arranged in the arc-shaped pipe in a sliding manner, the first sliding block and the second sliding block are symmetrically arranged relative to the strip-shaped sliding groove, the first sliding block and the second sliding block are connected with the moving block through arc-shaped pieces, one opposite side of the first sliding block and one opposite side of the second sliding block are respectively provided with the first wiring end and the second wiring end, a first clamping piece is arranged on the first sliding block and comprises two first clamping plates electrically communicated with the first wiring end, a fuse body is clamped by the two first clamping plates and is provided with a fuse wire electrically communicated with the first clamping plates, a second clamping piece is arranged on the second sliding block and comprises two second clamping plates electrically communicated with the second wiring end, and the other end of the fuse wire is clamped between the two second clamping plates.

Optionally, the arc tube includes left segmental arc, well segmental arc and right segmental arc, the lower extreme of left segmental arc and right segmental arc all communicates there are cooling tube and communicating pipe, the cooling tube intercommunication has and is located the thermovent of arc tube top, the wind that the thermovent blew off is directional well segmental arc.

Optionally, two arc-shaped guide grooves are arranged on the middle arc section, a discharge pipe is communicated with the lower end of the middle arc section, the two arc-shaped guide grooves are symmetrically arranged around the axis of the discharge pipe, and the lower ends of the arc-shaped guide grooves are communicated with the discharge pipe through guide pipes.

Optionally, an air cylinder is arranged on the upper portion of the bar-shaped block, a movable piston connected with the movable block is connected in the air cylinder in a sliding mode, the upper end of the air cylinder is communicated with an air inlet pipe and an air outlet pipe, and an air outlet of the air outlet pipe points to the middle arc section.

Optionally, the first sliding block and the second sliding block are connected to the arc-shaped member through elastic springs.

Optionally, an arc chute is arranged in the arc tube, two first sliding blocks are connected in the arc chute in a sliding manner, and the two first sliding blocks are fixedly connected with the first sliding block and the second sliding block respectively.

Optionally, the arc-shaped part is an elastic plastic part or a rubber part.

Optionally, a melting tank is formed in the melting cylinder, a melting alloy is arranged in the melting tank, and a heat conducting plate in contact with the melting alloy is arranged at an opening of the melting tank.

Optionally, the left part of the arc-shaped pipe is communicated with a vertical conveying channel, and a plurality of melting cylinders are stored in the vertical conveying channel.

Optionally, the fuse cylinder includes a base, a rotating column is rotatably connected to the base, and the fuse wire is wound on the rotating column.

From the above, it can be seen that, in the low-voltage switch cabinet for circuit protection provided by the present invention, the protection component is connected to the circuit device in the cabinet body through the first terminal and the second terminal, when the current in the circuit device is too large or the circuit is overloaded, the fuse wire connected between the first terminal and the second terminal is blown, the circuit device is powered off, the first terminal and the second terminal are disconnected, in order to facilitate the communication between the first terminal and the second terminal, the driving motor can be started to drive the driving rotating shaft to rotate, further drive the eccentric shaft to rotate around the axis of the driving rotating shaft, further drive the moving block to move up and down in the bar-shaped sliding groove, and facilitate the driving of the first sliding block and the second sliding block to slide in the arc-shaped tube, so that the first terminal and the second terminal are close to contact with each other, further electrically connect the first terminal and the second terminal, the first wiring end and the second wiring end are not communicated manually by people, time and labor are saved, and meanwhile, the circuit equipment is protected conveniently.

Drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a protection assembly of the present invention;

FIG. 3 is a schematic structural diagram of the fuse cylinder of the present invention.

In the figure: 1. a cabinet body; 2. a first terminal; 3. a second terminal; 4. a protection component; 5. a drive motor; 6. driving the rotating shaft; 7. rotating the disc; 8. an eccentric shaft; 9. a drive arm; 10. an arc tube; 11. a first slider; 12. a second slider; 13. an arcuate member; 14. a strip-shaped chute; 15. a moving block; 16. a radiating pipe; 17. a communicating pipe; 18. a discharge pipe; 19. an arc-shaped guide groove; 20. a heat dissipation port; 21. an elastic spring; 22. a first clamping member; 23. a fuse; 24. melting the cylinder; 25. rotating the column; 26. a base; 27. a second clamping member; 28. and (7) installing the block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1, 2 and 3, a low-voltage switch cabinet for circuit protection comprises a cabinet body 1, a circuit device and a protection component 4 are arranged in the cabinet body 1, the protection component 4 comprises a mounting block 28, a first wiring end 2 and a second wiring end 3, the protection component 4 is connected with the circuit device through the first wiring end 2 and the second wiring end 3, a driving motor 5 is arranged on the mounting block 28, an output end of the driving motor 5 is connected with a rotating disc 7 through a driving rotating shaft 6, an eccentric shaft 8 is arranged at an eccentric position on the rotating disc 7, the eccentric shaft 8 is connected with a moving block 15 through a driving arm 9, a strip-shaped block is arranged on the mounting block 28, a strip-shaped chute 14 is arranged on the strip-shaped block, the moving block 15 is connected in the strip-shaped chute 14 in a sliding manner, an arc-shaped pipe 10 is arranged outside the strip-shaped chute 14, a first sliding block 11 and a second sliding block 12 are arranged in the arc-shaped pipe 10 in a sliding manner, first sliding block 11 and second sliding block 12 set up about bar spout 14 symmetry, first sliding block 11 and second sliding block 12 all are connected with movable block 15 through flexible arc 13, first wiring end 2 and second wiring end 3 are set up respectively to first sliding block 11 and second sliding block 12 one side in opposite directions, be provided with first holder 22 on first sliding block 11, first holder 22 includes two first grip blocks that communicate with first wiring end 2 electricity, two first grip blocks holder has fuse body 24, be provided with fuse 23 with first grip block electricity intercommunication on the fuse body 24, be provided with second holder 27 on second sliding block 12, second holder 27 includes two second grip blocks that communicate with second wiring end 3 electricity, be used for the centre gripping fuse 23 other end between two second grip blocks.

When the low-voltage switch cabinet is used, the protection component 4 is connected with the circuit equipment in the cabinet body 1 through the first wiring terminal 2 and the second wiring terminal 3, when the current in the circuit equipment is too large or the circuit is overloaded, the fuse 23 connected between the first wiring terminal 2 and the second wiring terminal 3 is blown, the circuit equipment is powered off, the first wiring terminal 2 and the second wiring terminal 3 are disconnected, in order to facilitate the communication between the first wiring terminal 2 and the second wiring terminal 3, the driving motor 5 can be started to drive the driving rotating shaft 6 to rotate, further, the eccentric shaft 8 is driven to rotate around the axis of the driving rotating shaft 6, further, the moving block 15 is driven to move up and down in the strip-shaped sliding groove 14, the first sliding block 11 and the second sliding block 12 are driven to slide in the arc-shaped pipe 10, the first sliding block 11 and the second sliding block 12 are enabled to be close to contact with each other, further, the first wiring terminal 2 is enabled to be electrically communicated with the second wiring terminal 3, the first wiring end 2 and the second wiring end 3 are not communicated manually by people, time and labor are saved, and meanwhile, the circuit equipment is protected conveniently.

In order to further facilitate the communication between the first terminal 2 and the second terminal 3 after being disconnected, a melting groove is formed on the melting cylinder 24, a melting alloy is arranged in the melting groove, a heat conducting plate which is in contact with the melting alloy is arranged at an opening of the melting groove, after the fuse 23 on the melting cylinder 24 is fused, the driving motor 5 is started, so that the first sliding block 11 and the second sliding block 12 are in close contact with each other, the first terminal 2 and the second terminal 3 are electrically communicated, the circuit is convenient to communicate, if the current ratio in the communicated circuit is larger at the moment, the melting alloy is rapidly heated through the heat conducting plate, so that the air in the cavity between the first sliding block 11 and the second sliding block 12 is rapidly heated, the air in the cavity is expanded, in addition, the first sliding block 11 and the second sliding block 12 are sliding pistons, and the first sliding block 11 and the second sliding block 12 can be bent to oppositely move in a small range due to the arc-shaped piece 13, first slider 11 and second slider 12 are separated from each other until the temperature in the cavity decreases, and first slider 11 and second slider 12 are moved toward each other to be brought into contact with each other.

As shown in fig. 2, the arc tube 10 includes a left arc section, a middle arc section and a right arc section, the ends of the left arc section and the right arc section are all communicated with a heat dissipation tube 16 and a communication tube 17, the heat dissipation tube 16 is communicated with a heat dissipation port 20 located above the arc tube 10, the air blown out from the heat dissipation port 20 points to the middle arc section, the fuse 23 connected between the first wiring end 2 and the second wiring end 3 is blown out, when the first sliding block 11 and the second sliding block 12 slide in the arc tube 10, the external cold air enters the left arc section and the right arc section of the arc tube 10 through the communication tube 17, the air in the left arc section and the right arc section of the arc tube 10 is blown to the middle arc section through the heat dissipation tube 16, and the high temperature environment caused by the blowing reaction of the fuse 23 in the middle arc section is conveniently cooled.

In order to facilitate the treatment of the sundries in the middle arc section, the lower end of the middle arc section is communicated with a discharge pipe 18, two arc guide grooves 19 are arranged on the middle arc section, the two arc guide grooves 19 are symmetrically arranged about the axis of the discharge pipe 18, the lower end of the arc guide groove 19 is communicated with the discharge pipe 18 through a guide pipe, after a fuse 23 connected between a first terminal 2 and a second terminal 3 is burnt out, when a first sliding block 11 and a second sliding block 12 slide in the arc pipe 10 in opposite directions, a first clamping piece 22 loosens a fuse column body 24 clamped by the first clamping piece, the fuse 23 on the fuse column body 24 is burnt out, the first sliding block 11 and the second sliding block 12 slide in the arc pipe 10 in opposite directions so as to push the sundries in the middle arc section and the fuse column body 24 into the discharge pipe 18, the treatment of the sundries in the middle arc section is facilitated, in addition, the internal temperature of the fuse 23 in the middle arc section is increased when being burnt out, the air outside the middle arc section is contacted with the side wall of the middle arc section, water vapor in the air outside the middle arc section is gathered into water drops on the outer side wall of the middle arc section, so that the middle arc section is convenient to carry out heat dissipation and cooling treatment, and the water drops enter the discharge pipe 18 through the arc-shaped guide groove 19 and the guide pipe to be discharged.

Optionally, the bar piece upper portion is provided with the inflator, sliding connection has the removal piston of being connected with movable block 15 in the inflator, inflator upper end intercommunication intake pipe and outlet duct, the directional well segmental arc of outlet duct, be for the convenience of further carry out the heat dissipation processing to the segmental arc, reciprocate in bar spout 14 at movable block 15, drive the removal piston and reciprocate in the inflator for during external air enters into the inflator through the intake pipe, then blows to the segmental arc through the outlet duct, be convenient for further carry out the heat dissipation processing to the segmental arc.

As shown in fig. 2, first sliding block 11 and second sliding block 12 are both connected with arc 13 through elastic spring 21, when fuse 23 connected between first terminal 2 and second terminal 3 is blown, first sliding block 11 and second sliding block 12 are tightened and elastic spring 21 before fuse 23 is blown, so that fuse 23 is blown under the action of elastic spring 21, first sliding block 11 and second sliding block 12 slide in arc tube 10, so as to drive outside cold air to enter into left arc section and right arc section of arc tube 10 through communicating tube 17, air in left arc section and right arc section of arc tube 10 is blown to middle arc section through radiating tube 16, so as to facilitate the cooling process of heat dissipation due to the blowing reaction temperature rise of fuse 23 in middle arc section.

As shown in fig. 2, an arc chute is provided in the arc tube 10, two first sliders are slidably connected in the arc chute, and the two first sliders are respectively fixedly connected to the first slider 11 and the second slider 12, so as to further limit the sliding direction of the first slider 11 and the second slider 12 in the arc tube 10, prevent the deviation of the first slider 11 and the second slider 12, and facilitate the smooth sliding of the first slider 11 and the second slider 12 in the arc tube 10.

In order to facilitate the bending of arc-shaped element 13 in arc-shaped tube 10 and to support first sliding block 11 and second sliding block 12 to move in arc-shaped tube 10, arc-shaped element 13 is not easy to be broken, and arc-shaped element 13 may be an elastic plastic element or a rubber element.

In order to facilitate the arc 13 can be crooked in arc 10, be convenient for support first sliding block 11 and second sliding block 12 simultaneously and remove in arc 10, arc 13 is the hollow pole of elasticity, and the hollow pole intussuseption of elasticity is filled with air, packed ball, hollow etc. and wherein the packed ball can be out of shape.

In order to further prevent that arc 13 from being broken at the removal in-process, arc 13 is the hollow pole of elasticity, and the hollow pole intussuseption of elasticity is filled with non-deformable's hollow, and hollow equidistant setting, the articulated setting between two adjacent hollow, and the movable angle between two adjacent hollow is between zero degree to thirty degrees.

As shown in fig. 2, a vertical conveying channel is communicated with the left part of the arc-shaped pipe 10, a plurality of fuse cylinders 24 are stored in the vertical conveying channel, and after the fuse 23 on the fuse cylinder 24 clamped by the first clamping piece 22 is blown, a new fuse cylinder 24 can enter the arc-shaped pipe 10 through the vertical conveying channel, and then the first clamping piece 22 clamps the new fuse cylinder 24.

As shown in fig. 3, the melting cylinder 24 includes a base 26, a rotating cylinder 25 is rotatably connected to the base 26, the melting tank can be opened on the rotating column 25 or the base 26 on the melting cylinder 24, the base 26 is connected with the rotating column 25 through a bearing, the fuse 23 is wound on the rotating column 25, a new melt column 24 is held on the first holding member 22 through the vertical feed passage into the arced tube 10, and when the first holding member 22 and the second holding member 27 are brought closer together, the second holding member 27 holds the other end of the new fuse 23 on the new fuse cylinder 24, one end of the new fuse 23 is fixed on the side wall of the new rotation column 25, the first sliding block 11 and the second sliding block 12 move oppositely, the first holding member 22 and the second holding member 27 move away from each other, and the rotary post 25 is rotated with the first and second holding

members

22 and 27 away from each other at this time, so that the new fuse 23 held by the second holding member 27 on the rotary post 25 is released.

The working process of the low-voltage switch cabinet is as follows: the protection component 4 is connected with the circuit device in the cabinet 1 through the first wiring terminal 2 and the second wiring terminal 3, when the current in the circuit device is normal, the fuse 23 connected between the first wiring terminal 2 and the second wiring terminal 3 is not blown, the circuit device is normal, the driving motor 5 can be started at the moment to drive the rotating disc 7 and the eccentric shaft 8 thereon to rotate, so that the connection of the fuse 23 between the first wiring terminal 2 and the second wiring terminal 3 is not influenced by the moving block 15 in the strip-shaped sliding groove 14, the first sliding block 11 and the second sliding block 12 move up and down in a small range, external air can be driven to enter the arc-shaped pipe 10 through the communicating pipe 17 and then blown to the middle part of the arc-shaped pipe 10 through the heat dissipation port 20 of the heat dissipation pipe 16, and the fault or short circuit caused by overhigh temperature can be avoided as much as possible; when the current in the circuit device is too large or the circuit is overloaded, the fuse 23 connected between the first terminal 2 and the second terminal 3 is blown, the circuit device is powered off, the first terminal 2 and the second terminal 3 are disconnected, in order to facilitate the communication between the first terminal 2 and the second terminal 3, the driving motor 5 can be started to drive the driving rotating shaft 6 to rotate, further drive the eccentric shaft 8 to rotate around the axis of the driving rotating shaft 6, further drive the moving block 15 to move up and down in the bar-shaped sliding groove 14, so as to drive the first sliding block 11 and the second sliding block 12 to slide in the arc-shaped pipe 10, when the moving block 15 moves down in the bar-shaped sliding groove 14, the first sliding block 11 and the second sliding block 12 are close to each other to contact, further enable the first terminal 2 and the second terminal 3 to be electrically communicated, if the current ratio in the communicated circuit is larger at the moment, the molten alloy rapidly heats through the heat conducting plate, so that the air in the cavity between first sliding block 11 and second sliding block 12 is rapidly heated and the air in the cavity expands, and in addition, first sliding block 11 and second sliding block 12 can be reversely moved in a small range due to arc-shaped member 13, first sliding block 11 is disconnected from second sliding block 12 until the temperature in the cavity is reduced, first sliding block 11 and second sliding block 12 are moved towards each other to be reset to be in contact, and in addition, when first sliding block 11 and second sliding block 12 are moved towards each other, first clamping member 22 loosens melting cylinder 24 clamped by the first clamping member 22, melting wire 23 on melting cylinder 24 is already fused, first sliding block 11 and second sliding block 12 slide towards each other in arc-shaped pipe 10 to push sundries and melting cylinder 24 in arc-shaped section into discharge pipe 18, first sliding block 11 and second sliding block 12 are reversely moved under the starting of driving motor 5, first sliding block 11 is moved to the left of the vertical conveying channel, after a new fuse column body 24 enters the arc-shaped pipe 10 through the vertical conveying channel, the first clamping piece 22 clamps a base 26 on the new fuse column body 24, the second clamping piece 27 clamps the other end of the new fuse 23 on the new fuse column body 24, one end of the new fuse 23 is fixed on the side wall of the new rotating column 25, the first sliding block 11 and the second sliding block 12 move oppositely to enable the first clamping piece 22 and the second clamping piece 27 to be away from each other, at the moment, the rotating column 25 rotates along with the first clamping piece 22 and the second clamping piece 27 to be away from each other, so that the new fuse 23 clamped by the second clamping piece 27 on the rotating column 25 can be loosened conveniently, the first terminal 2 and the second terminal 3 are not required to be communicated manually by people, time and labor are saved, meanwhile, the protection of the circuit equipment is facilitated, when the first sliding block 11 and the second sliding block 12 slide in the arc-shaped pipe 10, external cold air enters the left arc-shaped section and the right arc-shaped section of the arc-shaped pipe 10 through the communicating pipe 17, the air in the left and right arc sections of the arc tube 10 is blown to the middle arc section through the heat dissipation tube 16, which facilitates the heat dissipation and temperature reduction treatment of the temperature rise in the middle arc section due to the blowing reaction of the fuse 23.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is merely exemplary in nature, and is not intended to intimate that the scope of the disclosure is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. A low-voltage switch cabinet for circuit protection comprises a cabinet body (1) and is characterized in that circuit equipment and a protection assembly (4) are arranged in the cabinet body (1), the protection assembly (4) comprises an installation block (28), a first wiring end (2) and a second wiring end (3), the protection assembly (4) is connected with the circuit equipment through the first wiring end (2) and the second wiring end (3), a driving motor (5) is arranged on the installation block (28), the output end of the driving motor (5) is connected with a rotating disc (7) through a driving rotating shaft (6), an eccentric shaft (8) is arranged at an eccentric position on the rotating disc (7), the eccentric shaft (8) is connected with a moving block (15) through a driving arm (9), a strip is arranged on the installation block (28), and a strip-shaped chute (14) is formed in the strip-shaped block, the moving block (15) is connected in the strip-shaped sliding groove (14) in a sliding manner, an arc-shaped pipe (10) is arranged on the outer side of the strip-shaped sliding groove (14), a first sliding block (11) and a second sliding block (12) are arranged in the arc-shaped pipe (10) in a sliding manner, the first sliding block (11) and the second sliding block (12) are symmetrically arranged relative to the strip-shaped sliding groove (14), the first sliding block (11) and the second sliding block (12) are both connected with the moving block (15) through an arc-shaped piece (13), the first wiring end (2) and the second wiring end (3) are respectively arranged on one opposite sides of the first sliding block (11) and the second sliding block (12), a first clamping piece (22) is arranged on the first sliding block (11), and the first clamping piece (22) comprises two first clamping plates electrically communicated with the first wiring end (2), the two first clamping plates clamp a fuse cylinder (24), a fuse wire (23) electrically communicated with the first clamping plates is arranged on the fuse cylinder (24), a second clamping piece (27) is arranged on the second sliding block (12), the second clamping piece (27) comprises two second clamping plates electrically communicated with the second terminal (3), and the other end of the fuse wire (23) is clamped between the two second clamping plates;

the melting cylinder body (24) is provided with a melting groove, melting alloy is arranged in the melting groove, and a heat conducting plate which is in contact with the melting alloy is arranged at an opening of the melting groove.

2. The low-voltage switch cabinet for circuit protection according to claim 1, wherein the arc-shaped tube (10) comprises a left arc section, a middle arc section and a right arc section, the lower ends of the left arc section and the right arc section are respectively communicated with a heat dissipation tube (16) and a communication tube (17), the heat dissipation tube (16) is communicated with a heat dissipation port (20) located above the arc-shaped tube (10), and air blown from the heat dissipation port (20) is directed to the middle arc section.

3. The low-voltage switch cabinet for circuit protection according to claim 2, wherein two arc-shaped guide grooves (19) are arranged on the middle arc section, a discharge pipe (18) is communicated with the lower end of the middle arc section, the two arc-shaped guide grooves (19) are symmetrically arranged about the axis of the discharge pipe (18), and the lower end of each arc-shaped guide groove (19) is communicated with the discharge pipe (18) through a guide pipe.

4. The low-voltage switch cabinet for circuit protection according to claim 2, wherein an air cylinder is arranged on the upper portion of the bar-shaped block, a movable piston connected with the movable block (15) is connected in the air cylinder in a sliding mode, an air inlet pipe and an air outlet pipe are communicated with the upper end of the air cylinder, and an air outlet of the air outlet pipe points to the middle arc section.

5. A low-voltage switchgear for circuit protection according to claim 1, wherein said first sliding block (11) and said second sliding block (12) are connected to said arc-shaped element (13) by means of elastic springs (21).

6. The low-voltage switch cabinet for circuit protection according to claim 1, wherein an arc-shaped sliding groove is formed in the arc-shaped tube (10), two first sliding blocks are slidably connected in the arc-shaped sliding groove, and the two first sliding blocks are fixedly connected with the first sliding block (11) and the second sliding block (12) respectively.

7. The low-voltage switchgear for circuit protection according to claim 1, wherein said arc-shaped member (13) is an elastic plastic member or a rubber member.

8. The low-voltage switch cabinet for circuit protection according to claim 1, wherein a vertical conveying channel is communicated with the left part of the arc-shaped pipe (10), and a plurality of melting cylinders (24) are stored in the vertical conveying channel.

9. The low-voltage switch cabinet for circuit protection according to claim 1 or 8, wherein the fuse holder (24) comprises a base (26), a rotating column (25) is rotatably connected to the base (26), and the fuse (23) is wound on the rotating column (25).