CN115692128B

CN115692128B - fuse base

Info

Publication number: CN115692128B
Application number: CN202211462203.3A
Authority: CN
Inventors: 郝明; 张建标
Original assignee: Shenzhen Victors Electronic Technology Co ltd
Current assignee: Shenzhen Victors Electronic Technology Co ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-12-05
Anticipated expiration: 2042-11-22
Also published as: CN115692128A

Abstract

The application relates to the technical field of fuses, in particular to a reliable new energy fuse base which comprises a shell and a movable frame, wherein the movable frame is rotatably connected in the shell, an installation groove for placing a fuse link is formed in the movable frame, two ends of the installation groove are respectively aligned with a positive terminal and a negative terminal, one end of the movable frame is provided with a pulling part for rotating the movable frame out of an opening, when the pulling part drives the movable frame to rotate out of the opening, the upper end and the lower end of the installation groove are synchronously away from the two terminals, and two sides of the movable frame are respectively matched with the inner wall of the shell to cover the positive terminal and the negative terminal in the shell. When the fuse link is detached and replaced, the two wiring terminals are covered in the shell, so that the risk of electric shock of workers is reduced, the insulation distance between the fuse link and the two contact terminals in the shell is large when the fuse link is opened, and electric arcs are not easy to generate between the fuse link and the contact terminals.

Description

Fuse base

Technical Field

The application relates to the technical field of fuses, in particular to a fuse base.

Background

The fuse is an electric appliance that fuses a melt by heat generated by the fuse when a current exceeds a predetermined value, and opens a circuit. The fuse melts the melt by the heat generated by the fuse after the current exceeds a specified value for a period of time, so that the circuit is disconnected; a current protector is made by applying the principle. The fuse is widely applied to high-low voltage distribution systems, control systems and electric equipment, is used as a protector for short circuit and overcurrent, and is one of the most common protection devices.

The existing fuse base is shown in fig. 1, and comprises a shell 1 and a movable piece 2, wherein a fuse link is arranged on the movable piece 2, the movable piece 2 is rotationally connected with one end of the shell 1, and wiring terminals are respectively arranged at the upper end and the lower end of the shell 1. Referring to fig. 2, when the fuse link is removed and replaced, the movable member 2 is pulled open from one side, so that the fuse link is taken out of the movable member 2.

The existing fuse base has the following problems: when the upper end of the shell 1 of the fuse base is connected with the positive electrode of the circuit, and the movable piece 2 is pulled open, the wiring end of the fuse base connected with the positive electrode of the circuit is exposed out of the opening, and workers can easily contact the wiring end of the positive electrode to cause electric shock; when the lower end of the shell 1 of the fuse base is connected with the positive electrode of the circuit, as the movable piece 2 is pulled open around the lower end of the shell 1, when the movable piece 2 is pulled open, the distance interval between the fuse and the wiring terminal connected with the lower part of the shell 1 and the positive electrode is smaller, an arc can exist between the fuse and the wiring terminal, and the electric shock of workers is also easy to cause.

Therefore, no matter which end of the fuse base is connected with the positive electrode of the circuit, the risk of electric shock exists in use, and the situation needs to be further improved.

Disclosure of Invention

In order to solve the problem that the existing fuse base has electric shock risk during use, the application provides a fuse base, which adopts the following technical scheme:

a fuse base, comprising:

the shell comprises an upper shell and a lower shell, an opening is formed in one side of the shell, and an anode wiring terminal and a cathode wiring terminal are respectively arranged at two ends of the interior of the shell;

the movable frame is rotationally connected in the shell, be provided with the mounting groove that is used for placing the fuse-link on the movable frame, the both ends of mounting groove aim at respectively anodal wiring end with the negative pole wiring end, the one end of movable frame is provided with and is used for with the movable frame is followed the portion of pulling of opening part roll-out, the portion of pulling drives the movable frame is followed when opening part roll-out, two wiring ends are kept away from in step to the upper and lower both ends of mounting groove, just, the both sides of movable frame respectively with the inner wall cooperation of shell will anodal wiring end with the negative pole wiring end covers in the shell.

By adopting the technical scheme, when a worker needs to detach or replace the fuse link, the movable frame drives the fuse link to rotate in the shell by operating the pulling part from bottom to top, so that the two ends of the fuse link are synchronously disconnected with the two wiring terminals in the shell; when the movable frame is opened, the insulation distance between the fuse link and the two contact terminals inside the shell is large, and electric arcs are not easy to generate between the fuse link and the contact terminals.

Optionally, after the pulling part drives the movable frame to rotate out of the opening, the movable frame separates the positive terminal and the negative terminal at two ends of the shell.

Through adopting above-mentioned technical scheme, when pulling the portion and driving the movable frame and roll out from the opening, the movable frame separates positive terminal and negative terminal at the both ends of shell to keep apart through insulating movable frame between messenger's positive terminal and the negative terminal, further reduced the production of electric arc between positive terminal and the negative terminal, thereby reduce the insulating distance between positive and negative terminal, make the fuse drain pan can make smaller size.

Optionally, the positive terminal and the negative terminal are diagonally arranged.

By adopting the technical scheme, the positive electrode terminal and the negative electrode terminal are diagonally arranged, so that the insulation distance between the positive electrode terminal and the negative electrode terminal is ensured to a greater extent.

Optionally, the positive terminal and the negative terminal are both provided with duckbill clamps, the duckbill clamps are used for clamping two contact ends of the fuse link, and the openings of the duckbill clamps of the positive terminal and the negative terminal face opposite directions.

Through adopting above-mentioned technical scheme, the setting that duckbilled pressed from both sides is convenient for anodal wiring end and negative pole wiring end and two contact ends of fuse-link are firm to be connected, and, anodal wiring end and the opening orientation opposite direction that duckbilled pressed from both sides of negative pole wiring end blocked the fuse-link, when the fuse received external force to strike from one side, the fuse was difficult to press from both sides the separation in the duckbilled, improves the stability of contact.

Optionally, an arc surface is disposed inside the casing near one end of the pulling portion, and the pulling portion drives the movable frame to rotate out from the opening, and a movable gap is always maintained between the arc surface and the outer wall of the movable frame.

Through adopting above-mentioned technical scheme, pull the in-process that portion drove the movable rack and roll out from the opening, remain the clearance that moves all the time between the outer wall of arcwall face and movable rack, on the one hand, be convenient for roll out the movable rack, on the other hand, at movable rack pivoted in-process, there is less clearance that moves all the time between movable rack and the arcwall face, thereby make the in-process staff be difficult to contact binding post, and the activity interval between tip of fuse-link and the arcwall face is less, make the passageway between fuse-link and the binding post less, the production of the electric arc between tip of fuse-link and the binding post has been reduced.

Optionally, the shell is close to one end of pulling portion be provided with be used for with pulling portion complex joint portion, the self-locking structure is installed to pulling portion, pulling portion passes through the self-locking structure joint is in on the joint portion.

Through adopting above-mentioned technical scheme, when the staff from last pulling down the portion of pulling, drive the movable frame and rotate, and then drive the fuse-link in the mounting groove and when the contact terminal contact at both ends about the shell, the movable frame is firm the hasp on the shell through the auto-lock structure to avoid the fuse to produce not hard up phenomenon, avoid the fuse-link contact failure to lead to early break.

Optionally, the clamping part is provided with a clamping groove, the self-locking structure comprises a rotating rod, a clamping block, a pressing block and a torsion spring, the rotating rod is rotationally connected to the pulling part, the clamping block and the pressing block are integrally formed and fixed on the rotating rod, the torsion spring is arranged between the rotating rod and the pulling part, and when the pulling part is clamped on the clamping part, the torsion spring drives the clamping block to be clamped with the clamping groove; when the pressing block is pressed, the rotating rod rotates and drives the clamping block to be separated from the clamping groove.

Through adopting above-mentioned technical scheme, when the movable frame is detained on the shell through auto-lock structure, the joint piece joint is in the joint inslot, and makes joint piece and joint groove combine more fastening under the effect of torsional spring to avoid the fuse to produce not hard up phenomenon, avoid the fuse-link to contact badly and lead to early break; when the pulling part is pulled to rotate the movable frame out of the opening so as to detach and replace the fuse link, the pressing block is pressed, the rotating rod rotates and drives the clamping block to be separated from the clamping groove, and the movable frame can be conveniently and rapidly opened by a worker.

Optionally, anti-slip grooves are formed in two sides of the wrenching portion.

Through adopting above-mentioned technical scheme, through set up the anti-skidding recess that even interval was arranged in the both sides of pulling the portion, strengthened the roughness of pulling the surface of portion to increased the frictional force between staff's finger and the portion of pulling when pulling the movable frame, the operation of being convenient for.

Optionally, the movable frame is located one side of shell outside is provided with insulating arc piece, pull the portion drive the movable frame follow the opening roll-out in-process, the arc piece all the time butt in the shell.

Through adopting above-mentioned technical scheme, be provided with insulating arc piece through being located the outside one side of shell at the movable frame, drive the movable frame from the opening in-process of rolling out when vibrating portion, insulating arc piece butt throughout in the shell to make the movable frame cover binding post in the shell better.

Optionally, an elastic protrusion is disposed at one end of the arc-shaped piece near the pulling portion, and when the pulling portion drives the movable frame to rotate out of the opening, the elastic protrusion abuts against the inner wall of the housing.

Through adopting above-mentioned technical scheme, through setting up the elastic bulge in the one end that the arc piece is close to the portion of pulling, on the one hand, after the portion of pulling drives the movable frame and rolls out from the opening, the elastic bulge can the butt at the inner wall of shell, prevents that the movable frame from being close to contact terminal again under the effect of gravity, on the other hand, can fix a position the movable frame, makes things convenient for the staff to dismantle or change the fuse-link.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the fuse link is detached and replaced, the two wiring terminals are covered in the shell, so that the risk of electric shock of workers is reduced, the insulation distance between the fuse link and the two contact terminals in the shell is large when the fuse link is opened, and electric arcs are not easy to generate between the fuse link and the contact terminals;

2. when the movable frame is opened, the movable frame separates the positive electrode wiring terminal and the negative electrode wiring terminal at two ends of the shell, so that the positive electrode wiring terminal and the negative electrode wiring terminal are isolated through the insulating movable frame, the generation of electric arcs between the positive electrode wiring terminal and the negative electrode wiring terminal is further reduced, the insulating distance between the positive electrode wiring terminal and the negative electrode wiring terminal is reduced, and the bottom shell of the fuse can be manufactured into smaller size;

3. through joint portion and auto-lock structure, when the staff pulls the portion of pulling from top to bottom, drives the movable frame and rotates, and then drives the fuse-link in the mounting groove and when the contact terminal at both ends about the shell contacted, the movable frame is firm the hasp on the shell through auto-lock structure to avoid the fuse to produce not hard up phenomenon, avoid the fuse-link to contact badly and lead to early break;

4. through the bellied setting of elasticity, on the one hand, after pulling the portion and driving the movable frame and roll out from the opening, the bellied inner wall that can the butt at the shell of elasticity prevents that the movable frame from being close to contact terminal again under the effect of gravity, on the other hand, can fix a position the movable frame, makes things convenient for the staff to dismantle the fuse-link or change.

Drawings

FIG. 1 is a schematic view of a prior art fuse base with the upper shell removed;

FIG. 2 is a schematic view of a prior art fuse base with a movable frame open;

FIG. 3 is a schematic diagram showing a complete structure of a fuse base according to an embodiment of the present application;

FIG. 4 is an exploded view of a fuse holder according to an embodiment of the present application;

FIG. 5 is a schematic view of a fuse base with an upper shell removed;

FIG. 6 is an enlarged schematic view of portion A of FIG. 5;

FIG. 7 is a schematic view of a fuse holder according to an embodiment of the present application when the movable frame is opened;

fig. 8 is a schematic view of a structure of a fuse holder according to a second embodiment of the present application when a movable frame of the fuse holder is opened.

Reference numerals illustrate: 1. a housing; 2. a movable member; 100. a housing; 110. an upper housing; 120. a lower housing; 130. a positive terminal; 140. a negative terminal; 150. an arc surface; 160. a clamping groove; 200. a movable frame; 210. a rotating shaft; 220. a mounting groove; 300. a spanner; 310. a self-locking structure; 311. a rotating lever; 312. a clamping block; 313. pressing the blocks; 314. a torsion spring; 320. an anti-slip groove; 400. a fuse link; 500. a duckbill clip; 600. an arc-shaped sheet; 610. and an elastic bulge.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

It should also be noted that in embodiments of the present application, words such as "exemplary" or "such as" or "for example" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" or "for example" is intended to present related concepts in a concrete fashion.

It should also be noted that the terms "first," "second," and "third," etc. in the description and figures of the present application are used for distinguishing between different objects or between different processes of the same object and not for describing a particular sequential order of objects. The terms "comprising" and "having" and any variations thereof, as referred to in the description of the application, are intended to cover non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or apparatus.

With the rapid progress of the industry of new energy automobiles, safety of electrical components of the new energy automobiles is particularly important, and fuses are important components of electrical systems of the new energy automobiles. The shape and the structure of the fuse base on the market are diversified, most of the fuse bases are designed according to the performance of the fuse, only the performances such as temperature resistance and the like are considered, the operation and the use are convenient, and the structural design of the fuse base is common.

The embodiment of the application provides a fuse base, which provides reliable safety guarantee for the use of a new energy fuse and solves the problem that the existing fuse base has an electric shock risk during the use.

Example 1

Referring to fig. 3, the fuse base includes a housing 100, one side of the housing 100 is provided with an opening, a movable frame 200 is provided inside the housing 100, one end of the movable frame 200 is provided with a pulling part 300, and the pulling part 300 is used to rotate the movable frame 200 out of the opening of the housing 100.

Referring to fig. 4, the case 100 includes an upper case 110 and a lower case 120, the upper case 110 and the lower case 120 constitute the case 100, a rotation shaft 210 is provided on the movable frame 200, the movable frame 200 is rotatably connected with the case 100 through the rotation shaft 210, a mounting groove 220 for placing the fuse link 400 is provided on the movable frame 200, both ends of the inside of the case 100 are provided with the positive terminal 130 and the negative terminal 140, respectively, and both ends of the mounting groove 220 are aligned with the positive terminal 130 and the negative terminal 140, respectively. It is noted that the fuse has no polarity division, and the positive terminal 130 and the negative terminal 140 are typically the upper end of the housing 100 that terminates the positive pole of the circuit and the lower end of the housing 100 that terminates the negative pole of the circuit, depending on the orientation of the fuse access circuit. The fuse is opened by pulling the pulling part 300 from the bottom to the top, so that the worker is safer and less likely to be injured by the arc.

Referring to fig. 5 to 7, when the movable frame 200 is positioned in the case 100, both ends of the fuse link 400 in the mounting groove 220 are respectively in contact with the positive terminal 130 and the negative terminal 140, the circuit is conducted, and when the fuse link 400 needs to be removed or replaced, the movable frame 200 is rotated out of the opening by pulling the pulling part 300. As shown in fig. 7, when the movable frame 200 is rotated out of the opening by the pulling part 300, the upper and lower ends of the mounting groove 220 are simultaneously separated from the two terminals, and both sides of the movable frame 200 are respectively engaged with the inner wall of the housing 100, covering the positive terminal 130 and the negative terminal 140 in the housing 100. It can be seen that when the movable frame 200 is opened to detach or replace the fuse link 400, since the two connection terminals are covered in the housing 100, a worker is difficult to contact the two connection terminals through the opening, so that the risk of electric shock is reduced, and when the movable frame 200 is opened, the insulation distances between the fuse link 400 and the two contact terminals inside the housing 100 are large, and an arc is not easily generated between the fuse link 400 and the contact terminals.

Referring to fig. 7, after the moving frame 200 is rotated out of the opening by the pulling part 300, the moving frame 200 separates the positive terminal 130 and the negative terminal 140 at both ends of the case 100. Fig. 7 shows that after the movable frame 200 is opened, one end of the mounting groove 220 is exposed to be opened, so that when a worker can take out the fuse link 400 from the lower side, the outer wall of the movable frame 200 abuts against the inner wall of the housing 100 to divide the housing 100 into two parts, and the positive terminal 130 and the negative terminal 140 are respectively divided at two ends, thereby isolating the positive terminal 130 from the negative terminal 140 by the insulating movable frame 200, further reducing the generation of arc between the positive terminal 130 and the negative terminal 140, thereby reducing the insulation distance required between the positive terminal 140 and the negative terminal 140, and enabling the fuse bottom shell to be manufactured to be smaller in size.

As shown in fig. 5, the positive terminal 130 and the negative terminal 140 are diagonally arranged, thereby more largely securing the insulation distance between the positive terminal 130 and the negative terminal 140. The positive terminal 130 and the negative terminal 140 are each provided with a duckbill clip 500, the duckbill clips 500 being used to hold the two contact ends of the fuse link 400, the openings of the duckbill clips 500 of the positive terminal 130 and the negative terminal 140 facing in opposite directions. Through this setting, be convenient for anodal wiring end 130 and negative pole wiring end 140 and two contact ends of fuse-link 400 carry out firm connection, and, anodal wiring end 130 and the duckbill clamp 500 of negative pole wiring end 140 open-ended orientation opposite direction, block the fuse-link 400 from both sides, when the fuse receives external force to strike from one side, the fuse is more difficult to separate in duckbill clamp 500, improves the stability of contact.

Referring to fig. 5, an arc surface 150 is disposed inside one end of the housing 100 near the pulling portion 300, and a movable gap is always maintained between the arc surface 150 and an outer wall of the movable frame 200 during the process that the pulling portion 300 drives the movable frame 200 to rotate out from the opening. The movable clearance is convenient for roll-out the movable frame 200 on the one hand, and on the other hand, at movable frame 200 pivoted in-process, there is less movable clearance all the time between movable frame 200 and the arcwall face 150 to make the in-process staff be difficult to contact binding post, and the activity interval between tip and the arcwall face 150 of fuse-link 400 is less, makes the passageway between fuse-link 400 and the binding post less, can reduce the production of electric arc between tip and the binding post of fuse-link 400 equally.

Referring to fig. 5 and 6, an end of the housing 100, which is close to the pulling portion 300, is provided with a clamping portion for being matched with the pulling portion 300, the pulling portion 300 is provided with a self-locking structure 310, and the pulling portion 300 is clamped on the clamping portion through the self-locking structure 310. The self-locking structure 310 drives the movable frame 200 to rotate when a worker pulls the pulling part 300 from top to bottom, and then drives the fuse link 400 in the mounting groove 220 to contact with the contact terminals at the upper end and the lower end of the housing 100, and the movable frame 200 can be firmly locked on the housing 100 through the self-locking structure 310, so that the phenomenon that the fuse is loose is avoided, and the breakfast caused by poor contact of the fuse link 400 is avoided.

Specifically, as shown in fig. 6, the clamping portion has a clamping groove 160, the self-locking structure 310 includes a rotating rod 311, a clamping block 312, a pressing block 313 and a torsion spring 314, the rotating rod 311 is rotatably connected to the pulling portion 300, the clamping block 312 and the pressing block 313 are integrally formed and fixed on the rotating rod 311, a torsion spring 314 is disposed between the rotating rod 311 and the pulling portion 300, and when the pulling portion 300 is clamped on the clamping portion, the torsion spring 314 drives the clamping block 312 to be clamped with the clamping groove 160; when the pressing block 313 is pressed, the rotating rod 311 rotates and drives the clamping block 312 to be separated from the clamping groove 160. With the arrangement, when the movable frame 200 is locked on the shell 100 through the self-locking structure 310, the clamping block 312 is clamped in the clamping groove 160, and the clamping block 312 and the clamping groove 160 are combined to be more fastened under the action of the torsion spring 314, so that the phenomenon that the fuse is loose is avoided, and the early break caused by poor contact of the fuse link 400 is avoided; when the pulling part 300 is pulled to rotate the movable frame 200 out of the opening for disassembling and replacing the fuse link 400, the pressing block 313 is pressed, the rotating rod 311 rotates and drives the clamping block 312 to be separated from the clamping groove 160, so that a worker can conveniently and rapidly open the movable frame 200.

The anti-slip grooves 320 are formed at both sides of the pulling part 300 to enhance the roughness of the outer surface of the pulling part 300, thereby increasing the friction between the fingers and the pulling part 300 when the worker pulls the movable frame 200, and facilitating the operation of the worker. The size and shape of the anti-slip grooves 320 are not limited herein.

The implementation principle of the fuse base provided by the embodiment of the application is as follows: when the fuse link 400 is disassembled and replaced, the movable frame 200 can cover two wiring terminals in the shell 100, so that the risk of electric shock of workers is reduced, the insulation distance between the fuse link 400 and two contact terminals in the shell 100 is large when the fuse link is opened, and electric arcs are not easy to generate between the fuse link 400 and the contact terminals; and when the movable frame 200 is opened, the movable frame 200 separates the positive and negative terminals 130 and 140 at both ends of the housing 100, thereby isolating between the positive and negative terminals 130 and 140 by the insulating movable frame 200, further reducing the generation of arc between the positive and negative terminals 130 and 140, thereby reducing the insulating distance between the positive and negative terminals 140, so that the fuse bottom case can be manufactured in a smaller size.

Example two

The present embodiment is different from the first embodiment in that the structure of the movable frame 200 near the opening side is provided differently.

Referring to fig. 8, an insulating arc piece 600 is disposed on one side of the movable frame 200 outside the housing 100, and the movable frame 200 is covered in the housing 100 by the movable frame 200 while the movable frame 200 is driven by the pulling portion 300 to rotate out of the opening, wherein the arc piece 600 is always abutted to the housing 100, so that the fingers of a worker are better insulated from the wiring terminals, and the movable frame 200 can better cover the wiring terminals in the housing 100.

Further, the arc piece 600 is provided with the elastic bulge 610 near the one end of the pulling part 300, and when the pulling part 300 drives the movable frame 200 to rotate out of the opening, the elastic bulge 610 is abutted against the inner wall of the shell 100, so that the lower end of the fuse link 400 is prevented from being close to the contact terminal again under the action of gravity, and on the other hand, the movable frame 200 can be positioned, and the fuse link 400 can be detached or replaced conveniently by a worker.

The application is based on the principle that the movable frame 200 can better cover the wiring terminal in the shell 100 by arranging the insulating arc-shaped sheet 600 on one side of the movable frame 200 outside the shell 100; through setting up the elastic bulge 610 to when preventing to open movable frame 200, movable frame 200 is under the effect of gravity, and the fuse-link 400 lower extreme is close to contact terminal again, on the other hand, can fix a position movable frame 200, makes things convenient for the staff to dismantle or change fuse-link 400.

The above description is merely of the preferred embodiments of the present application, and the present application is not limited thereto, and any person skilled in the art can easily think about various changes and substitutions within the scope of the present application, which should be covered by the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A fuse base, comprising:

the shell (100) comprises an upper shell (110) and a lower shell (120), an opening is formed in one side of the shell (100), and a positive terminal (130) and a negative terminal (140) are respectively arranged at two ends of the interior of the shell (100);

the movable frame (200) is rotatably connected in the shell (100), an installation groove (220) for placing a fuse link (400) is formed in the movable frame (200), two ends of the installation groove (220) are respectively aligned with the positive terminal (130) and the negative terminal (140), a rotating shaft (210) is arranged on the movable frame (200), the rotating shaft is arranged in the middle of the movable frame (200), and the movable frame (200) is rotatably connected with the shell (100) through the rotating shaft (210); one end of the movable frame (200) is provided with a pulling part (300) for rotating the movable frame (200) out of the opening, when the pulling part (300) drives the movable frame (200) to rotate out of the opening, the upper end and the lower end of the mounting groove (220) are synchronously away from the two wiring terminals, and the two sides of the movable frame (200) are respectively matched with the inner wall of the shell (100) to cover the positive wiring terminal (130) and the negative wiring terminal (140) in the shell (100);

an insulating arc-shaped sheet (600) is arranged on one side of the movable frame (200) positioned outside the shell (100), and the arc-shaped sheet (600) is always abutted against the shell (100) in the process that the spanner (300) drives the movable frame (200) to rotate out of the opening;

one end of the arc-shaped piece (600) close to the pulling part (300) is provided with an elastic bulge (610), and when the pulling part (300) drives the movable frame (200) to rotate out of the opening, the elastic bulge (610) is abutted to the inner wall of the shell (100).

2. The fuse base of claim 1, wherein: after the pulling part (300) drives the movable frame (200) to rotate out of the opening, the movable frame (200) separates the positive terminal (130) and the negative terminal (140) at two ends of the shell (100).

3. The fuse base of claim 1, wherein: the positive terminal (130) and the negative terminal (140) are diagonally arranged.

4. The fuse base of claim 1, wherein: the positive terminal (130) and the negative terminal (140) are respectively provided with a duckbill clamp (500), the duckbill clamps (500) are used for clamping two contact ends of the fuse link (400), and openings of the duckbill clamps (500) of the positive terminal (130) and the negative terminal (140) face opposite directions.

5. The fuse base of claim 1, wherein: an arc-shaped surface (150) is arranged in the shell (100) close to one end of the pulling part (300), and a movable gap is always kept between the arc-shaped surface (150) and the outer wall of the movable frame (200) in the process that the pulling part (300) drives the movable frame (200) to rotate out of the opening.

6. The fuse base of claim 1, wherein: one end of the shell (100) close to the pulling part (300) is provided with a clamping part matched with the pulling part (300), the pulling part (300) is provided with a self-locking structure (310), and the pulling part (300) is clamped on the clamping part through the self-locking structure (310).

7. The fuse base of claim 6, wherein: the clamping part is provided with a clamping groove (160), the self-locking structure (310) comprises a rotating rod (311), a clamping block (312), a pressing block (313) and a torsion spring (314), the rotating rod (311) is rotationally connected to the pulling part (300), the clamping block (312) and the pressing block (313) are integrally formed and fixed on the rotating rod (311), the torsion spring (314) is arranged between the rotating rod (311) and the pulling part (300), and when the pulling part (300) is clamped on the clamping part, the torsion spring (314) drives the clamping block (312) to be clamped with the clamping groove (160); when the pressing block (313) is pressed, the rotating rod (311) rotates and drives the clamping block (312) to be separated from the clamping groove (160).

8. The fuse base of claim 1, wherein: anti-slip grooves (320) are formed in two sides of the wrenching portion (300).