Fuse for over-current protection

Abstract

The invention relates to the technical field of fuses, and provides a fuse for over-current protection, the fuse comprises a fusible core and a base, the base is internally provided with a placing cavity, the fusible core is located in the placing cavity, the fuse further comprises a replacement box, a moving plate, a supporting plate, a limiting assembly and a discharging assembly, the replacement box is fixedly connected to the upper portion of the base, the top of the replacement box is provided with a placing opening, and the moving plate is arranged in the placing opening. The replacement box communicates with the placement cavity through the inlet, the moving plate is movably arranged in the placement cavity, the supporting plate is fixedly connected to the moving plate and used for opening and closing the inlet, the limiting assembly is used for limiting the fusible core, the discharging assembly is used for discharging and collecting the fused fusible core, and the discharging assembly comprises a discharging bin. A discharging opening is formed in the base, the containing cavity communicates with a discharging bin through the discharging opening, and an opening and closing door is hinged to the discharging bin. By means of the technical scheme, the problems that in the prior art, after the fusible core is fused, replacement needs a certain time, and meanwhile certain risks exist are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and in particular to a fuse for overcurrent protection. Background Art

[0002] Fuses are mainly used to protect circuits. When overloaded or short-circuited, the fuse will blow, cutting off the current to prevent equipment damage or fire.

[0003] At present, fuses mainly include a fusible core and a base. The base is used to connect to the external circuit, and the fusible core is installed inside the base. When the circuit is overloaded or short-circuited, the fusible core melts to protect the circuit. The fusible core needs to be manually removed from the base, and then a new fusible core needs to be installed. The replacement process takes a certain amount of time, and the new fusible core needs to be prepared in advance. The fuse is generally installed inside the electrical control cabinet and needs to be replaced by a professional. There is a certain risk of electric shock, and it takes a certain amount of time for the staff to replace the fusible core. Therefore, we propose a fuse for overcurrent protection, which can automatically replace the fusible core and reduce manual participation. Summary of the invention

[0004] The present invention provides a fuse for overcurrent protection, which solves the problem in the related art that it takes a certain amount of time and has certain risks to replace the fuse core after it is blown.

[0005] The technical solution of the present invention is as follows: A fuse for overcurrent protection, comprising a fuse core and a base, wherein a placement cavity is provided inside the base, and the fuse core is located inside the placement cavity, and further comprising: A replacement box, the replacement box is fixedly connected above the base, a placement inlet is provided on the top of the replacement box, and the replacement box is connected to the placement cavity through the inlet; A movable plate, the movable plate being movably disposed inside the placement cavity; A support plate, the support plate is fixedly connected to the movable plate and is used to open and close the entrance; A limiting component, the limiting component is used to limit the fuse core, and the limiting component includes: A limit plate, the limit plate is connected to the movable plate through a compression spring and a telescopic rod, and the limit plate is in contact with the fusible core; A limit seat, the limit seat is fixedly connected to the inner wall of the placement cavity, and the limit seat is in contact with the fuse; A connecting block, wherein two connecting blocks are provided, the connecting blocks are fixedly connected to the inside of the placement cavity, and two ends of the fusible core are respectively in contact with the two connecting blocks; A discharge assembly, the discharge assembly is used to discharge and collect the blown fuse core, the discharge assembly comprises: A discharge bin, wherein a discharge port is provided on the base, the placement cavity is connected to the discharge bin through the discharge port, and the discharge bin is hinged with an opening and closing door; A baffle is slidably connected to the interior of the placement cavity, the baffle and the movable plate move synchronously, and the baffle is used to open and close the discharge port.

[0006] In order to assist in discharging the molten core, an auxiliary ejection assembly is also included, and the auxiliary ejection assembly is used to push the molten core into the discharge bin, and the auxiliary ejection assembly includes: A push plate, the push plate is movably arranged inside the placement cavity, and the push plate is located at a side of the molten core away from the discharge port; A push rod is slidably mounted on the base, the push rod is fixedly connected to the push plate, and the push rod is transmission-connected to the moving plate.

[0007] In order to realize the movement of the movable plate and the baffle, a driving plate is movably arranged on the base, the movable plate is movably arranged on the driving plate, and the movable plate is connected to the baffle through a telescopic rod.

[0008] In order to realize the transmission connection between the push rod and the movable plate, the push rod is connected to the movable plate through a transmission assembly, and the transmission assembly includes: A transmission gear, the transmission gear being rotatably connected to the driving plate; A driving rack, wherein the driving rack is fixedly connected to the moving plate; A slide plate, wherein the slide plate is slidably connected to the push rod; A driven rack is fixedly connected to the slide plate, the driven rack and the driving rack are centrally symmetrical with respect to the transmission gear, and both the driving rack and the driven rack are meshed with the transmission gear.

[0009] In order to ensure stability when the fusible core is pushed out, a blocking rod is fixedly connected to the inner wall of the placement cavity through an elastic plate, and the blocking rod is in contact with the fusible core.

[0010] In order to facilitate the movement of the new fusible core to the installation position, a plurality of balls are rotatably connected to the inner bottom wall of the placement cavity.

[0011] In order to facilitate the insertion of the fusible core into the interior of the replacement box, a chamfer is provided on the top of the insertion opening.

[0012] In order to realize quick opening and closing of the opening and closing door, a magnet is fixedly connected to the discharge bin, and an iron metal sheet is fixedly connected to the opening and closing door, and the iron metal sheet is in contact with the magnet.

[0013] The working principle and beneficial effects of the present invention are: 1. In the present invention, the limiting plate is driven by the compression spring to press the fusible core between the limiting seat and the connecting block to ensure the connection between the fusible core and the base. When the fusible core needs to be replaced, the movable plate drives the limiting plate away from the fusible core and drives the baffle to open the discharge port at the same time. The push plate can also be moved by the movement of the movable plate and the transmission action of the transmission assembly to push the fusible core through the discharge port into the internal storage of the discharge bin.

[0014] 2. In the present invention, when the movable plate drives the baffle plate away from the fuse to open the discharge port, it also drives the support plate to open the entrance port, so that the new fuse in the replacement box falls into the interior of the placement cavity, and the limit plate and the baffle rod support and limit the new fuse. As the movable plate moves, the limit plate drives the new fuse to be pushed between the two connecting blocks to connect the fuse and the base.

[0015] 3. Therefore, compared with the fuse in the prior art, the present invention places a new fuse inside the replacement box. After the fuse blows, the old fuse core can be pushed out from the inside of the placement cavity in time, and the new fuse core can be pushed to the installation position, which reduces manual intervention. After the replacement is completed, the blown fuse core in the discharge bin can be taken out, and the new fuse core can be placed in the replacement box at the same time. The fuse core can be replaced in time and then replenished. At the same time, when replacing the fuse core, the fuse core is in the area outside the base, which is safer and reduces the risk of electric shock. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a structural schematic diagram of the first viewing angle of the present invention; Figure 2 It is a structural schematic diagram of the second viewing angle of the present invention; Figure 3 It is a schematic diagram of the structure of a partial cross-section of the present invention; Figure 4 It is a structural schematic diagram of a partial cross-section of the base of the present invention; Figure 5 It is a structural schematic diagram of the baffle, transmission assembly, moving plate and support plate of the present invention from a first perspective; Figure 6 A schematic structural diagram of the baffle, transmission assembly, moving plate and support plate of the present invention from a second viewing angle; Figure 7 It is a structural schematic diagram of the transmission assembly, the moving plate and the supporting plate of the present invention; Figure 8 It is a structural schematic diagram of the base, the limit seat and the connecting block of the present invention; Fig. 9 It is a structural schematic diagram of the fuse, base and connecting block of the present invention; Fig.10For the present invention Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] In the figure: 1. Fuse core; 2. Base; 3. Replacement box; 4. Moving plate; 5. Support plate; 6. Driving plate; 7. Electric cylinder 1; 8. Electric cylinder 2; 9. Telescopic rod; 10. Elastic plate; 11. Stop rod; 12. Ball bearing; 101, limit plate; 102, limit seat; 103, connection block; 201, discharge bin; 202, baffle; 203, opening and closing door; 204, magnet; 205, iron metal sheet; 301, push plate; 302, push rod; 401, driving rack; 402, sliding plate; 403, driven rack. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 10 As shown, this embodiment proposes a fuse for overcurrent protection, including a fuse core 1 and a base 2. A placement cavity is provided inside the base 2, and the fuse core 1 is located inside the placement cavity. It also includes a replacement box 3, a movable plate 4, a support plate 5, a limit assembly and a discharge assembly. Compared with the fuse in the prior art, the present invention places a new fuse inside the replacement box 3. After the fuse blows, the old fuse core 1 can be pushed out from the inside of the placement cavity in time, and the new fuse core 1 can be pushed to the installation position, thereby reducing manual participation. After the replacement is completed, the blown fuse core 1 in the discharge bin 201 can be taken out, and the new fuse core 1 can be placed inside the replacement box 3. The fuse core 1 can be replaced in time, and the fuse core 1 can be supplemented later. At the same time, when the fuse core 1 is replaced, the fuse core 1 is in the area outside the base 2, which is safer and reduces the risk of electric shock.

[0021] The replacement box 3 is fixedly connected to the top of the base 2, and an entry is provided on the top of the replacement box 3. The replacement box 3 is connected to the placement cavity through the entry. In order to facilitate the placement of the fuse 1 into the replacement box 3, a chamfer is provided on the top of the entry. The movable plate 4 is movably arranged in the placement cavity. The support plate 5 is fixedly connected to the movable plate 4 and is used to open and close the entry. In order to realize the movement of the movable plate 4 and the baffle 202, a driving plate 6 is movably arranged on the base 2, and an electric cylinder 7 is installed on the base 2. The driving plate 6 is fixedly connected to the output end of the electric cylinder 7. The movable plate 4 is movably arranged on the driving plate 6, and an electric cylinder 2 8 is installed on the driving plate 6. The movable plate 4 is fixedly connected to the output end of the electric cylinder 2 8. The movable plate A telescopic rod 9 is connected between 4 and the driving plate 6 to ensure the stability of the movable plate 4. The telescopic direction of the electric cylinder 1 7 and the telescopic direction of the electric cylinder 2 8 are perpendicular to each other. The movable plate 4 is connected to the baffle 202 through the telescopic rod 9. The new fuse 1 is placed inside the replacement box 3. The electric cylinder 1 7 can drive the movable plate 4 to be close to or away from the installation position of the fuse 1. When the movable plate 4 is away from the installation position of the fuse 1, the support plate 5 can be driven away from the entrance, so that the new fuse 1 in the replacement box 3 falls into the inside of the placement cavity, and then the new fuse 1 is pushed to the installation position for installation by the movable plate 4. The new fuse 1 can be added to the inside of the replacement box 3. The extension and retraction of the telescopic rod 9 can adapt to the movement of the movable plate 4 driven by the electric cylinder 2 8.

[0022] The limiting assembly is used to limit the fuse 1. The limiting assembly includes a limiting plate 101, a limiting seat 102 and a connecting block 103. The limiting plate 101 is connected to the movable plate 4 through a compression spring and a telescopic rod 9. The limiting plate 101 contacts the fuse 1. The limiting seat 102 is fixedly connected to the inner wall of the placement cavity. The limiting seat 102 contacts the fuse 1. Two connecting blocks 103 are provided. The connecting blocks 103 are fixedly connected to the inside of the placement cavity. The two ends of the fuse 1 contact the two connecting blocks 103 respectively. Under the action of the compression spring, the limit plate 101 presses the fuse 1 against the surface of the limit seat 102. The limit plate 101 and the limit seat 102 fit with the surface of the fuse 1, limiting the fuse 1 between the two connecting blocks 103. The connecting block 103 is made of metal and is electrically connected to the fuse 1. At the same time, the connecting block 103 is electrically connected to the electrical control cabinet through the circuit on the base 2, so that the fuse 1 is installed on the circuit, and the circuit is protected when it is overloaded or short-circuited by the melting of the fuse 1.

[0023] The discharge assembly is used to discharge and collect the blown fusible core 1. The discharge assembly includes a discharge bin 201 and a baffle 202. A discharge outlet is provided on the base 2. The placement chamber is connected to the discharge bin 201 through the discharge outlet. The discharge bin 201 is hinged with an opening and closing door 203. The baffle 202 is slidably connected to the inside of the placement chamber. The baffle 202 and the movable plate 4 move synchronously. The baffle 202 is used to open and close the discharge outlet. When the movable plate 4 is driven to move by the electric cylinder 7, the baffle 202 and the movable plate 4 are driven to move synchronously by the telescopic rod 9. When the movable plate 4 is away from the blown fusible core 1, the baffle 202 opens the discharge outlet. The blown fusible core 1 can be discharged to the inside of the discharge bin 201 through the discharge outlet. At the same time, when the movable plate 4 is away from the blown fusible core 1, it drives the support plate 5 to open the entrance, and the new fusible core 1 falls into the placement chamber. As the movable plate 4 approaches the connecting block 1 03 is the installation position of the fusible core 1, which pushes the new fusible core 1 to be installed between the two connecting blocks 103, and at the same time drives the baffle 202 to close the discharge outlet, and the support plate 5 to close the entrance, to ensure the stability of the installed fusible core 1, to prevent the installed new fusible core 1 from falling from the discharge outlet, and at the same time prevent the new fusible core 1 in the replacement box 3 from falling into the placement cavity. In order to realize the quick opening and closing of the opening and closing door 203, a magnet 204 is fixedly connected to the discharge bin 201, and an iron metal sheet 205 is fixedly connected to the opening and closing door 203. The iron metal sheet 205 is in contact with the magnet 204. When the new fusible core 1 is placed in the replacement box 3, the opening and closing door 203 is opened, and the old fusible core 1 that has been blown in the discharge bin 201 can be taken out. The attraction of the magnet 204 and the iron metal sheet 205 can ensure the stability of the opening and closing door 203, and the old fusible core 1 inside it can be prevented from falling.

[0024] In order to assist in discharging the molten core 1, an auxiliary ejection component is also included, which is used to push the molten core 1 into the discharge bin 201. The auxiliary ejection component includes a push plate 301 and a push rod 302. The push plate 301 is movably arranged inside the placement cavity. The push plate 301 is located on the side of the molten core 1 away from the discharge port. The push rod 302 is slidably installed on the base 2. The push rod 302 and the push plate 301 are fixedly connected. The push rod 302 is transmission-connected to the moving plate 4. To achieve the transmission connection between the push rod 302 and the moving plate 4, the push rod 302 is transmission-connected to the moving plate 4 through a transmission component. The transmission component includes a transmission gear, a driving rack 401, a slide plate 402 and a driven rack 403. The transmission gear is rotatably connected to the driving plate 6. The driving rack 401 is fixedly connected to the moving plate 4. The slide plate 402 and the push rod 302 are slidingly connected. The driven rack 403 and the slide plate 402 are fixedly connected. The driven rack 403 and the driving rack 401 are centrally symmetrical with respect to the transmission gear, and the driving rack 401 and the driven rack 403 are both meshed with the transmission gear. When the electric cylinder 28 drives the movable plate 4 away from the baffle 202, the movable plate 4 drives the driving rack 401 to move. Under the transmission action of the transmission gear, the driven rack 403 drives the slide plate 402 and the push rod 302 to move to a position close to the base 2, and drives the push plate 301 to push the fused core 1 to the discharge bin 201. After being pushed out, the movable plate 4 and the push plate 301 move back to their original positions, so that the movable plate 4 drives the limiting plate 101 to push the new fuse 1 to between the two connecting blocks 103, so as to avoid the push plate 301 and the push rod 302 from hindering the installation of the new fuse 1. Through the sliding cooperation between the slide plate 402 and the push rod 302, the slide plate 402 can adapt to the movement of the movable plate 4 and the driving plate 6.

[0025] To ensure stability when pushing out the fusible core 1, the inner wall of the placement cavity is fixedly connected with a baffle 11 through an elastic plate 10, and the baffle 11 is in contact with the fusible core 1. When the new fusible core 1 falls into the placement cavity from the replacement box 3, the new fusible core 1 is between the limit plate 101 and the baffle, and as the movable plate 4 drives the limit plate 101 to push the new fusible core 1 between the two connecting blocks 103, the elastic plate 10 can be pushed to bend. When the fusible core 1 moves between the two connecting blocks 103, the elastic plate 10 drives the baffle to return to its original position, and cooperates with the limit seat 102, the limit plate 101 and the baffle 202 to limit the fusible core 1. At the same time, when the movable plate 4 drives the limit plate 101 away from the fusible core 1 and the push plate 301 pushes the fusible core 1 into the discharge bin 201, the fusible core 1 is limited to a certain extent to prevent the fusible core 1 from tilting and falling.

[0026] To facilitate the movement of the new fusible core 1 to the installation position, a plurality of balls 12 are rotatably connected to the inner bottom wall of the placement cavity. The top of the ball 12 is height-matched with the connecting block 103 at the bottom. When the new fusible core 1 falls into the placement cavity, the moving plate 4 drives the limiting plate 101 to push the fusible core 1 to the installation position. The rotation of the ball 12 reduces the resistance of the fusible core 1 during movement.

[0027] The working principle or use process of the overcurrent protection fuse is as follows: Put a new fuse 1 into the replacement box 3, install the base 2 inside the electrical control cabinet, and one fuse 1 is located between two connecting blocks 103 to work. The limit plate 101, the limit seat 102, the baffle 202 and the lever jointly limit the fuse 1; When the circuit is overloaded or short-circuited, the fuse core 1 is blown and needs to be replaced. The electric cylinder 1 7 pushes the driving plate 6, the moving plate 4 and the limit plate 101 away from the blown fuse core 1 for a distance, and the baffle 202 opens the discharge port. The electric cylinder 2 8 drives the moving plate 4 away from the baffle 202. Under the transmission action of the driving rack 401, the transmission gear and the driven rack 403, the driving push rod 302 and the push plate 301 push the fuse core 1 into the discharge bin 201 through the discharge port, and then the electric cylinder 2 8 drives the moving plate 4 and the push plate 301 to return to their original positions. The movable plate 4 is then moved away from the installation position of the fusible core 1 for a distance, and the support plate 5 opens the entrance, so that the new fusible core 1 in the replacement box 3 falls into the placement cavity, and the fusible core 1 is located between the limit plate 101 and the baffle 11. The electric cylinder 7 drives the movable plate 4 to approach the connecting block 103, and pushes the new fusible core 1 to move between the two connecting blocks 103. At the same time, the movable plate 4 drives the baffle 202 to close the discharge port, and the support plate 5 closes the entrance. The limit plate 101, the limit seat 102, and the baffle 11 cooperate to limit the fusible core 1. Then the staff opens the opening and closing door 203 during free time, takes out the old fusible core 1 in the discharge bin 201, and puts the new fusible core 1 into the replacement box 3.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuse for overcurrent protection, comprising a fuse core (1) and a base (2), wherein a placement cavity is provided inside the base (2), and the fuse core (1) is located inside the placement cavity, characterized in that: It also includes a replacement box (3), a moving plate (4), a support plate (5), a limit assembly and a discharge assembly; The replacement box (3) is fixedly connected above the base (2); a placement opening is provided on the top of the replacement box (3); and the replacement box (3) is connected to the placement cavity through the placement opening; The movable plate (4) is movably arranged inside the placement cavity; The support plate (5) is fixedly connected to the movable plate (4) and is used to open and close the entrance; Wherein, the limiting component is used to limit the position of the fuse (1); The discharge assembly is used to discharge and collect the blown fuse core (1), and the discharge assembly comprises: A discharge bin (201), wherein a discharge outlet is provided on the base (2), the placement cavity is connected to the discharge bin (201) via the discharge outlet, and the discharge bin (201) is hingedly provided with an opening and closing door (203).

2. The overcurrent protection fuse according to claim 1, characterized in that: The limiting component comprises: a limit plate (101), the limit plate (101) being connected to the movable plate (4) via a compression spring and a telescopic rod (9), the limit plate (101) being in contact with the fusible core (1); A limit seat (102), the limit seat (102) being fixedly connected to the inner wall of the placement cavity, the limit seat (102) being in contact with the fuse (1); A connection block (103), wherein two connection blocks (103) are provided, and the connection blocks (103) are fixedly connected inside the placement cavity, and the two ends of the fuse core (1) are respectively in contact with the two connection blocks (103).

3. The overcurrent protection fuse according to claim 2, characterized in that: The discharge assembly further comprises: A baffle (202), the baffle (202) being slidably connected inside the placement cavity, the baffle (202) and the movable plate (4) moving synchronously, and the baffle (202) being used to open and close the discharge port.

4. The overcurrent protection fuse according to claim 3, characterized in that: It also includes an auxiliary ejection assembly, the auxiliary ejection assembly is used to push the fusible core (1) into the ejection bin (201), the auxiliary ejection assembly comprising: A push plate (301), the push plate (301) being movably arranged inside the placement cavity, the push plate (301) being located on a side of the fusible core (1) away from the discharge port; A push rod (302), the push rod (302) is slidably mounted on the base (2), the push rod (302) and the push plate (301) are fixedly connected, and the push rod (302) and the movable plate (4) are transmission-connected.

5. The overcurrent protection fuse according to claim 4, characterized in that: A driving plate (6) is movably arranged on the base (2), the moving plate (4) is movably arranged on the driving plate (6), and the moving plate (4) is connected to the baffle (202) via a telescopic rod (9).

6. The overcurrent protection fuse according to claim 5, characterized in that: The push rod (302) is transmission-connected to the moving plate (4) via a transmission assembly, wherein the transmission assembly comprises: a transmission gear, the transmission gear being rotatably connected to the drive plate (6); A driving rack (401), wherein the driving rack (401) and the movable plate (4) are fixedly connected; A slide plate (402), wherein the slide plate (402) and the push rod (302) are slidably connected; A driven rack (403), the driven rack (403) and the slide plate (402) are fixedly connected, the driven rack (403) and the driving rack (401) are centrally symmetrical relative to the transmission gear, and the driving rack (401) and the driven rack (403) are both meshed with the transmission gear.

7. The overcurrent protection fuse according to claim 6, characterized in that: The inner wall of the placement cavity is fixedly connected to a blocking rod (11) via an elastic plate (10), and the blocking rod (11) is in contact with the fusible core (1).

8. The overcurrent protection fuse according to claim 7, characterized in that: A plurality of balls (12) are rotatably connected to the inner bottom wall of the placement cavity.

9. The overcurrent protection fuse according to claim 8, characterized in that: The top of the insertion opening is provided with a chamfer.

10. The overcurrent protection fuse according to claim 9, characterized in that: The discharge bin (201) is fixedly connected to a magnet (204), the opening and closing door (203) is fixedly connected to an iron metal sheet (205), and the iron metal sheet (205) is in contact with the magnet (204).

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