A pull-out fuse

Abstract

This invention discloses a pull-out fuse, comprising a housing, an operating handle, a fuse core body, and electrode assemblies. The operating handle has a laterally extending fuse core fixing cavity in its center for mounting the fuse core body. The fuse core body is detachably and elastically embedded in the fuse core fixing cavity. The housing has a handle mounting groove for accommodating the operating handle, which is slidably and rotatably connected to the handle mounting groove. Two sets of electrode assemblies are symmetrically fixed on the left and right sides of the handle mounting groove, and are detachably snapped onto the left and right ends of the fuse core body. The left and right sides of the housing each have a wiring port corresponding to the position of the electrode assembly, through which wires pass and connect to the electrode assemblies. The bottom of the housing is detachably snapped onto a guide rail. This pull-out fuse allows for quick and convenient fuse core replacement, avoids the risk of electric shock, and is safe and reliable. The installation and removal of the housing and guide rail are also more convenient.

Description

Technical Field

[0001] This invention relates to a fuse, and more particularly to a pull-out fuse. Background Technology

[0002] A fuse is a device that breaks the circuit by melting its fusible element when the current exceeds a specified value. A fuse consists of a housing, a fusible element inside the housing, and other electrical components. The fusible element is electrically connected to these other components to ensure the fuse operates normally. Under prolonged use, the fusible element is prone to damage and needs replacement. Common fuses on the market require disassembling the housing to remove the damaged element, which is inconvenient, time-consuming, and labor-intensive. Furthermore, some pull-out fuses have a handle that wobbles when the handle is pulled out for replacement, posing a safety hazard by the risk of hitting surrounding parts. Summary of the Invention

[0003] This invention was made to overcome the shortcomings of the prior art. The purpose of this invention is to provide a pull-out fuse that allows for quick and convenient replacement of the fuse element, avoids the risk of electric shock, is safe and reliable, and makes the installation and removal of the fuse housing and guide rail more convenient.

[0004] This invention discloses a pull-out fuse, comprising a housing, an operating handle, a fuse core body, and electrode assemblies. The operating handle has a laterally extending fuse core fixing cavity in its center for mounting the fuse core body. The fuse core body is detachably and elastically embedded in the fuse core fixing cavity. The housing has a handle mounting slot for accommodating the operating handle. The operating handle is reciprocally pulled up and down and connected to the handle mounting slot. The lower middle part of the operating handle is rotatably connected to the upper part of the handle mounting slot. The front and rear sides of the lower end of the operating handle are detachably abutted against the inner wall of the upper part of the housing. Two sets of electrode assemblies are symmetrically fixed on the left and right sides of the handle mounting slot. The two sets of electrode assemblies are detachably snapped onto the left and right ends of the fuse core body. The left and right sides of the housing have wiring ports corresponding to the positions of the electrode assemblies. Wires pass through the wiring ports and connect to the corresponding electrode assemblies. The bottom of the housing is detachably snapped onto a guide rail.

[0005] The pull-out fuse of the present invention may also be:

[0006] The left end of the core fixing cavity is provided with a slot, and the left end of the core body is detachably fixed and inserted into the slot. The right end of the core fixing cavity is provided with an elastic clamping assembly, which includes an upper elastic clamping piece and a lower elastic clamping piece. The right end of the core body is detachably clamped between the upper elastic clamping piece and the lower elastic clamping piece. The lower surface of the upper elastic clamping piece and the upper surface of the lower elastic clamping piece respectively releasably abut against the right end of the core body.

[0007] The longitudinal section of the upper elastic clip is a U-shaped opening facing forward. The lower sidewall of the upper elastic clip is inclined from back to front and from top to bottom. The longitudinal section of the lower elastic clip is a U-shaped opening facing backward. The upper sidewall of the lower elastic clip is inclined from front to back and from bottom to top. The lower sidewall of the upper elastic clip and the upper sidewall of the lower elastic clip are respectively releasable elastically abutted against the right end of the molten core body.

[0008] The electrode assembly includes an electrode plate, a wiring frame, a connecting piece, and a screw. The electrode plate and the wiring frame are fixedly disposed within the housing. The electrode plate includes an integrally formed U-shaped spring piece located on the inner side and a conductor plate located on the outer side. The fused core body is embedded in the U-shaped spring piece, and its front and rear sides are releasably abutted against the inner wall of the U-shaped spring piece, respectively. The longitudinal cross-section of the wiring frame is "U"-shaped, and the longitudinal cross-section of the connecting piece is "U". The conductor plate passes through the wiring frame from the inside to the outside. The lower sidewall of the connecting piece passes through the wiring frame and is located above the conductor plate. A threaded hole is opened on the upper sidewall of the wiring frame, and a through hole is opened on the upper sidewall of the connecting piece to allow the screw to pass through. The screw passes through the threaded hole and is threadedly connected to the upper sidewall of the wiring frame. The lower end of the screw abuts against the upper surface of the lower sidewall of the connecting piece. The conductor is releasably fixed and pressed between the lower sidewall of the connecting piece and the conductor plate.

[0009] A clamping spring is fitted on the outer side of the U-shaped spring. The inner wall of the clamping spring and the outer wall of the U-shaped spring are clamped together elastically. The bottom of the clamping spring abuts against the bottom of the outer shell, and the lower part of the outer wall of the clamping spring abuts against the inner wall of the outer shell.

[0010] The clamping spring includes an integrally formed spring body with a longitudinal cross-section of "U" shape and two clamping arms extending laterally at the front and rear ends of the top of the spring body. The two clamping arms of the clamping spring on the left side extend from left to right from the front and rear ends of the top of the spring body corresponding to the position, and the two clamping arms of the clamping spring on the right side extend from right to left from the front and rear ends of the top of the spring body corresponding to the position. The bottom of the spring body abuts against the bottom of the outer shell, and the inner wall of the spring body, the rear side of the clamping arm on the front side, and the front side of the clamping arm on the rear side elastically abut against the outer wall of the U-shaped spring piece.

[0011] The housing has two electrode mounting slots for accommodating the electrode assembly. The two electrode mounting slots are symmetrically arranged on the left and right sides of the handle mounting slot. The wiring frame is fixedly embedded in the corresponding electrode mounting slot. The wiring piece can slide up and down through the corresponding electrode mounting slot. The outer surface of the wiring piece slides against the inner wall of the electrode mounting slot. The lead plate passes between the handle mounting slot and the electrode mounting slot.

[0012] A guide block is provided in the middle of the lower end of the operating handle. Guide grooves are symmetrically provided on the front and rear sides of the handle mounting groove. The front and rear sides of the guide block are slidably connected to the corresponding guide grooves. The thickness of the guide block gradually increases from top to bottom, then gradually decreases to the middle of the guide block. The front and rear edges of the longitudinal section of the upper and middle parts of the guide block are arcs, and the front and rear edges of the longitudinal section of the lower part of the guide block are straight lines.

[0013] The bottom of the outer casing has a first fixing block and a second fixing block on its left and right sides, respectively. The guide rail is located between the first fixing block and the second fixing block. The left side of the guide rail abuts against the right side of the first fixing block, and the right side of the guide rail abuts against the right side of the second fixing block and is fixed by a mounting plate. The interior of the second fixing block has a mounting groove for the mounting plate to slide back and forth in the left and right direction. The groove walls on the front and rear sides of the mounting groove have first sliding grooves. The mounting plate has first sliders symmetrically arranged on the front and rear sides. The first sliders are slidably connected to the first sliding grooves. The center of the right side of the mounting plate has an upwardly protruding elastic block. The top of the mounting groove has a downwardly protruding limiting block fixedly arranged. The elastic block is elastically engaged with the limiting block. The left end of the mounting plate is releasably abutted against the mounting plate.

[0014] The mounting plate is symmetrically provided with second sliders on the front and rear sides of the left side. The second sliders are arranged parallel to the top of the first slider. The mounting groove is provided with second sliding grooves on the front and rear sides of the left side. The second sliding grooves are arranged parallel to the top of the first sliding grooves. The second sliders are slidably connected to the second sliding grooves in a limiting manner.

[0015] This invention discloses a pull-out fuse, comprising a housing, an operating handle, a fuse core body, and electrode assemblies. The operating handle has a laterally extending fuse core fixing cavity in its center for mounting the fuse core body. The fuse core body is detachably and elastically embedded in the fuse core fixing cavity. The housing has a handle mounting slot for accommodating the operating handle. The operating handle is reciprocally pulled up and down and connected to the handle mounting slot. The lower middle part of the operating handle is rotatably connected to the upper part of the handle mounting slot. The front and rear sides of the lower end of the operating handle are detachably abutted against the inner wall of the upper part of the housing. Two sets of electrode assemblies are symmetrically fixed on the left and right sides of the handle mounting slot. The two sets of electrode assemblies are detachably snapped onto the left and right ends of the fuse core body. The left and right sides of the housing have wiring ports corresponding to the positions of the electrode assemblies. Wires pass through the wiring ports and connect to the corresponding electrode assemblies. The bottom of the housing is detachably snapped onto a guide rail. In this way, when the fuse element needs to be replaced due to damage, the operating handle embedded in the handle mounting slot is pulled upwards. After the operating handle slides out of the mounting slot, the fuse element installed in the fuse element fixing cavity can be removed and replaced. The operating handle can swing back and forth significantly after removal. The operator holds the operating handle with one hand, and with the lower end of the operating handle against the inner wall of the front or rear of the housing, the position of the operating handle is fixed, preventing it from wobbling back and forth, facilitating removal and preventing the operator from touching other parts around the fuse when replacing the fuse element due to instability caused by the back-and-forth wobbling after pulling out, thus enhancing safety. The new fuse element is then inserted into the fuse element fixing cavity, and the operating handle is pushed back into the housing. The two ends of the fuse element are connected to the electrode assembly, completing the replacement quickly and conveniently. Simultaneously, the wires are connected to the electrode assembly through the wiring ports on both sides of the fuse housing. The electrode assembly is fixedly installed inside the housing. When replacing the fuse element, the fuse element is completely separated from the electrode assembly at both ends, avoiding the risk of electric shock during replacement. Furthermore, the fuse housing can be releasably snapped onto the guide rail, facilitating easy installation and disassembly. Specifically, the housing consists of a front cover and a rear cover. The pull-out installation structure of the operating handle is as follows: limiting pins are provided on the left and right sides of the upper part of the operating handle; vertically extending handle grooves are formed on the inner walls of the left and right sides of the handle mounting groove; the two limiting pins of the operating handle are slidably connected to the corresponding handle grooves; and the upper and lower ends of the handle grooves are respectively designed as arcs, allowing the operating handle to swing back and forth after being pulled out. Compared with the prior art, the pull-out fuse of this invention has the following advantages: quick and convenient replacement of the fuse element, avoiding the risk of electric shock, ensuring safety and reliability; and making the installation and disassembly of the fuse housing and guide rail more convenient. Attached Figure Description

[0016] Figure 1 This is an external schematic diagram of a pull-out fuse according to the present invention.

[0017] Figure 2 This is a cross-sectional view of the internal structure of a pull-out fuse according to the present invention. Figure 1 (Off state).

[0018] Figure 3 This is an exploded cross-sectional view of a component of a pull-out fuse according to the present invention.

[0019] Figure 4 This is a cross-sectional view of the internal structure of a pull-out fuse according to the present invention. Figure 2 (Open)

[0020] Figure 5 This is a cross-sectional view of the internal structure of a pull-out fuse according to the present invention. Figure 3 .

[0021] Figure 6 This is an internal cross-sectional view of a pull-out fuse according to the present invention. Figure 4 (Off state).

[0022] Figure 7 This is an internal cross-sectional view of a pull-out fuse according to the present invention. Figure 5 (Open)

[0023] Figure 8 This is a cross-sectional view of the electrode assembly installation structure of a pull-out fuse according to the present invention.

[0024] Figure 9 This is an exploded view of the electrode assembly of a pull-out fuse according to the present invention.

[0025] Figure 10 This is a schematic diagram of the guide block and housing mating structure of a pull-out fuse according to the present invention. Figure 1 .

[0026] Figure 11 This is a schematic diagram of the guide block and housing mating structure of a pull-out fuse according to the present invention. Figure 2 .

[0027] Figure 12 This is a schematic diagram showing the rearward swing state of the operating handle of a pull-out fuse according to the present invention.

[0028] Figure 13 This is a schematic diagram of the forward swing state of the operating handle of a pull-out fuse according to the present invention.

[0029] Figure 14 This is a schematic diagram of the internal structure of the second fixing block of a pull-out fuse according to the present invention.

[0030] Figure 15 This is a schematic diagram of the guide rail mounting structure for a pull-out fuse according to the present invention. Figure 1 .

[0031] Figure 16 This is a schematic diagram of the guide rail mounting structure for a pull-out fuse according to the present invention. Figure 2 .

[0032] Figure 17 This is a schematic diagram of the guide rail structure of a pull-out fuse according to the present invention.

[0033] Figure 18 This is a schematic diagram of the operating handle pull-out structure of a pull-out fuse according to the present invention. Figure 1 .

[0034] Figure 19 This is a schematic diagram of the operating handle pull-out structure of a pull-out fuse according to the present invention. Figure 2 .

[0035] Drawing number explanation

[0036] 1…Outer casing 2…Operating handle 3…Fuse core body

[0037] 4…Electrode assembly 5…Fuse core fixing cavity 6…Handle slide groove

[0038] 7…Connection port 8…Guide rail 9…Handle mounting slot

[0039] 10…Slot 11…Upper elastic clip 12…Lower elastic clip

[0040] 13…Electrode piece 14…Connecting frame 15…Connecting piece

[0041] 16… Screw 17… U-shaped spring 18… Wire plate

[0042] 19…Clamping spring 20…Spring body 21…Clamping arm

[0043] 22…Electrode mounting groove 23…Guide block 24…Guide groove

[0044] 25…First fixing block 26…Second fixing block 27…Mounting plate

[0045] 28…First slide groove 29…Elastic locking block 30…Limiting block

[0046] 31…First slider 32…Second slider 33…Second groove

[0047] 34…Front cover 35…Rear cover 36…Limiting pin Detailed Implementation

[0048] In this invention, when directions (up, down, left, right, inside, and outside) are described, they are... Figure 2The structure shown is for reference only, but the actual application of the present invention is not limited to this. The first fixing block 25 is on the left, and the second fixing block 26 is on the right; the operating handle 2 is in front, and the rear cover 35 is at the rear.

[0049] The following is combined Figures 1 to 19 The present invention will be further described in detail with respect to a pull-out type fuse.

[0050] Please refer to the present invention for a pull-out type fuse. Figures 1 to 19The device includes a housing 1, an operating handle 2, a fuse core body 3, and an electrode assembly 4. The operating handle 2 has a laterally extending fuse core fixing cavity 5 in its middle for mounting the fuse core body 3. The fuse core body 3 is detachably and elastically embedded in the fuse core fixing cavity 5. The housing 1 has a handle mounting slot 9 for accommodating the operating handle 2. The operating handle 2 is reciprocally pulled up and down into the handle mounting slot 9, and the lower middle part of the operating handle 2 is rotatably connected to the upper part of the handle mounting slot 9 with front-to-back limiting rotation. The front and rear sides of the lower end of the operating handle 2 are releasably abutted against the inner wall of the upper part of the outer shell 1. Two sets of electrode assemblies 4 are symmetrically fixed on the left and right sides of the handle mounting groove 9. The two sets of electrode assemblies 4 are releasably snapped to the left and right ends of the fuse body 3. The left and right sides of the outer shell 1 are respectively provided with wiring ports 7 corresponding to the positions of the electrode assemblies 4. The wires are passed through the wiring ports 7 and connected to the corresponding electrode assemblies 4. The bottom of the outer shell 1 is releasably snapped to the guide rail 8. Thus, when the fuse body 3 is damaged and needs to be replaced, the operating handle 2, which is embedded in the handle mounting slot 9, is pulled upwards. After the operating handle 2 slides out of the handle mounting slot 9, the fuse installed in the fuse fixing cavity 5 can be removed and replaced. The operating handle 2 can swing back and forth significantly after being removed. The operator holds the operating handle 2 with one hand, and with the lower end of the operating handle 2 against the inner wall of the front or rear side of the outer casing 1, the position of the operating handle 2 is fixed and will not wobble back and forth, making it easy to remove. This also prevents the operator from accidentally touching other parts around the fuse when replacing the fuse due to instability caused by the back-and-forth wobbling of the operating handle 2 after it is pulled out, thus enhancing safety. The new fuse body 3 is then embedded in the fuse fixing cavity 5, and the operating handle 2 is pushed back into the outer casing 1. The two ends of the fuse are connected to the electrode assembly 4, completing the replacement. The replacement of the fuse is quick and convenient. Meanwhile, the wires are connected to the electrode assembly 4 through the wiring ports 7 on both sides of the fuse housing 1. The electrode assembly 4 is fixedly installed inside the housing 1. When replacing the fuse element, the fuse element body 3 is completely detached from the electrode assemblies 4 at both ends, thus avoiding the risk of electric shock during fuse element replacement. In addition, the fuse housing 1 can be detachably snapped onto the guide rail 8, making installation and disassembly convenient. Specifically, the housing 1 consists of a front cover 34 and a rear cover 35. The pull-out installation structure of the operating handle 2 is as follows: the upper left and right sides of the operating handle 2 are provided with limiting pins 36, and the inner walls of the left and right sides of the handle mounting groove 9 are provided with vertically extending handle grooves 6. The two limiting pins 36 of the operating handle 2 are respectively slidably connected in the corresponding handle grooves 6, and the upper and lower ends of the handle grooves 6 are respectively designed as arcs so that the operating handle 2 can swing in the back and forth direction after being pulled out. Compared with the prior art, the pull-out fuse of the present invention has the following advantages: the fuse element replacement is quick and convenient, avoiding the risk of electric shock, safe and reliable, and the installation and disassembly of the fuse housing 1 and the guide rail 8 are more convenient.

[0051] This invention provides a pull-out type fuse, which, based on the technical solution described above, is subject to further reference. Figures 1 to 19 Alternatively, the left end of the core fixing cavity 5 may be provided with a slot 10, into which the left end of the core body 3 may be detachably and securely inserted. The right end of the core fixing cavity 5 may be provided with an elastic clamping assembly, comprising an upper elastic clamping piece 11 and a lower elastic clamping piece 12. The right end of the core body 3 may be detachably clamped between the upper elastic clamping piece 11 and the lower elastic clamping piece 12. The lower surface of the upper elastic clamping piece 11 and the upper surface of the lower elastic clamping piece 12 may respectively elastically abut against the right end of the core body 3. Thus, when installing the core body 3, the left end of the core body 3 is first inserted into the slot 10, and then the right end of the core body 3 is inserted between the upper elastic clamping piece 11 and the lower elastic clamping piece 12. The two elastic clamping pieces apply an elastic clamping force in the vertical direction to the core body 3, thereby fixing the core body 3 in the core fixing cavity 5 and facilitating disassembly. Based on the technical solution described above, a further preferred embodiment is that the longitudinal cross-section of the upper elastic clamp 11 is a U-shaped opening facing forward, and the lower sidewall of the upper elastic clamp 11 is inclined from back to front and from top to bottom. The longitudinal cross-section of the lower elastic clamp 12 is a U-shaped opening facing backward, and the upper sidewall of the lower elastic clamp 12 is inclined from front to back and from bottom to top. The lower sidewall of the upper elastic clamp 11 and the upper sidewall of the lower elastic clamp 12 respectively releasably abut against the right end of the molten core body 3. In this way, the U-shaped elastic clamps generate greater pressure, which can more firmly clamp the molten core body 3. At the same time, when the molten core body 3 is disassembled, the lower sidewall of the upper elastic clamp 11 is subjected to an upward force, thus opening and moving upward, and the upper sidewall of the lower elastic clamp 12 is subjected to a downward force, thus opening and moving downward. The arc-shaped portion between the upper and lower sidewalls of each elastic clamp can avoid stress concentration and improve the service life of the elastic clamps. The lower sidewall of the upper elastic clamp 11 and the upper sidewall of the lower elastic clamp 12 are inclined, so that an additional clamping force in the front-back direction can be applied to the core body 3, thereby further improving the installation stability of the core body 3. Specifically, a downward protrusion can be provided on the front edge of the lower sidewall of the upper elastic clamp 11, and an upward protrusion can be provided on the rear edge of the upper sidewall of the lower elastic clamp 12, for limiting the core body 3 in the front-back direction.

[0052] This invention provides a pull-out type fuse, which, based on the technical solution described above, is subject to further reference. Figures 1 to 19Alternatively, the electrode assembly 4 may include an electrode plate 13, a wiring frame 14, a wiring piece 15, and a screw 16. The electrode plate 13 and the wiring frame 14 are fixedly disposed within the housing 1. The electrode plate 13 includes an integrally formed U-shaped spring piece 17 located on the inner side and a lead wire plate 18 located on the outer side. The fused core body 3 is embedded in the U-shaped spring piece 17, and its front and rear sides are releasably abutted against the inner wall of the U-shaped spring piece 17. The longitudinal section of the wiring frame 14 is "U"-shaped, and the longitudinal section of the wiring piece 15 is "U"-shaped. The lead wire plate 18 extends from... The wire is inserted into the wiring frame 14 from the inside out. The lower sidewall of the wiring piece 15 is inserted into the wiring frame 14 and located above the conductor plate. The upper sidewall of the wiring frame 14 has a threaded hole. The upper sidewall of the wiring piece 15 has a through hole that allows the screw 16 to pass through. The screw 16 is inserted into the threaded hole and threadedly connected to the upper sidewall of the wiring frame 14. The lower end of the screw 16 abuts against the upper surface of the lower sidewall of the wiring piece 15. The wire is releasably fixed and pressed between the lower sidewall of the wiring piece 15 and the conductor plate 18. In this way, the U-shaped spring 17 of the electrode plate 13 is used to connect to the fused core body 3, the lead plate 18 of the electrode plate 13 is used to connect the lead wire, and the connecting piece 15 presses the lead wire against the guide plate, thereby realizing the connection between the lead wire and the electrode plate 13. The wiring frame 14 is used to install the screw 16 and the connecting piece 15. By tightening the screw 16, the connecting piece 15 can be moved down to press the lead wire. When it is necessary to disconnect the lead wire, the screw 16 is rotated in the opposite direction to move the connecting piece 15 up, so that the lead wire can be taken out from the wiring port 7. Disassembly and connection are quick and convenient, and a large axial force can be generated when the thread is tightened, which can ensure a tight connection between the lead wire and the lead plate 18. Based on the technical solution described above, it is further preferred that a clamping spring 19 is sleeved on the outside of the U-shaped spring 17. The inner wall of the clamping spring 19 is elastically abutted against the outer wall of the U-shaped spring 17. The bottom of the clamping spring 19 abuts against the bottom of the outer shell 1, and the lower part of the outer wall of the clamping spring 19 abuts against the inner wall of the outer shell 1. In this way, the clamping spring 19 is set so that the U-shaped spring 17 can be in close contact with the molten core body 3.Based on the technical solution described above, a further preferred embodiment is that the clamping spring 19 includes an integrally formed spring body 20 with a longitudinal cross-section of "U" shape and two laterally extending clamping arms 21 located at the front and rear ends of the top of the spring body 20. The two clamping arms 21 of the left-side clamping spring 19 extend from left to right from the front and rear ends of the top of the corresponding spring body 20, and the two clamping arms 21 of the right-side clamping spring 19 extend from right to left from the front and rear ends of the top of the corresponding spring body 20. The bottom of the spring body 20 abuts against the bottom of the outer shell 1, and the inner wall of the spring body 20, the rear side of the front clamping arm 21, and the front side of the rear clamping arm 21 elastically abut against the outer wall of the U-shaped spring piece 17. In this way, the addition of laterally extending clamping arms 21 at the upper end of the clamping spring 19 increases the contact area with the U-shaped spring piece 17, resulting in a better clamping effect. In addition, the U-shaped spring sheet 17 is provided with limiting protrusions on both the front and rear sides, so that the two side walls of the spring body 20 are embedded in the limiting protrusions to prevent the clamping spring 19 from shifting in the left and right directions. Based on the technical solution described above, it is further preferred that: the outer shell 1 is provided with two electrode mounting slots 22 for accommodating the electrode assembly 4. The two electrode mounting slots 22 are symmetrically arranged on the left and right sides of the handle mounting slot 9. The wiring frame 14 is fixedly embedded in the corresponding electrode mounting slot 22. The wiring piece 15 can slide up and down through the corresponding electrode mounting slot 22. The outer surface of the wiring piece 15 slides against the inner wall of the electrode mounting slot 22. The wire plate passes between the handle mounting slot 9 and the electrode mounting slot 22. In this way, the electrode assembly 4 is embedded in the electrode mounting groove 22, which isolates the electrode assembly 4 from the handle mounting groove 9 and can limit and fix the electrode assembly 4. The lead plate 18 is inserted between the handle mounting groove 9 and the electrode mounting groove 22. The groove wall between the two grooves can press and fix the lead plate 18 inside the outer shell 1. At the same time, the wiring frame 14 does not need to be fixed with additional parts. It can be pressed and fixed to the bottom of the electrode mounting groove 22 by the lead plate 18 alone.

[0053] This invention provides a pull-out type fuse, which, based on the technical solution described above, is subject to further reference. Figures 1 to 19Alternatively, the operating handle 2 may have a guide block 23 at the middle of its lower end, and guide grooves 24 may be symmetrically provided on the front and rear sides of the handle mounting groove 9. The front and rear sides of the guide block 23 may be slidably connected to the corresponding guide grooves 24. The thickness of the guide block 23 may gradually increase from top to bottom, then gradually decrease to the middle of the guide block 23. The front and rear edges of the longitudinal section of the upper and middle parts of the guide block 23 may be arcs, while the front and rear edges of the longitudinal section of the lower part of the guide block 23 may be straight lines. In this way, when the operating handle 2 is pulled out upwards, the guide block 23 slides upwards in the guide groove 24. The front and rear sides (the thickest part) of the middle part of the guide block 23 slide against the inner wall of the outer casing 1, which plays a guiding and limiting role for the operating handle 2. When the operating handle 2 is pulled out of the handle mounting groove 9 (at the highest position), it can swing back and forth significantly. When the operator holds the operating handle 2 with one hand and the lower part of the guide block 23 at the middle of its lower end abuts against the inner wall of the front or rear side of the outer casing 1, the position of the operating handle 2 is fixed because the front and rear edges of the longitudinal section of the lower part of the guide block 23 are straight. It will not swing back and forth, making it easy to remove. It also avoids the unstable back and forth swinging of the operating handle 2 after it is pulled out, which could cause the operator to touch other parts around the fuse when changing the fuse element, making it safer.

[0054] This invention provides a pull-out type fuse, which, based on the technical solution described above, is subject to further reference. Figures 1 to 19Alternatively, the following configuration is provided: a first fixing block 25 and a second fixing block 26 are respectively provided on the left and right sides of the bottom of the outer casing 1; a guide rail 8 is provided between the first fixing block 25 and the second fixing block 26; the left side of the guide rail 8 abuts against the right side of the first fixing block 25; the right side of the guide rail 8 abuts against the right side of the second fixing block 26 and is fixed by a mounting plate 27; the interior of the second fixing block 26 is provided with a mounting groove for the mounting plate 27 to slide back and forth in the left and right direction; the groove walls on the front and rear sides of the mounting groove are provided with first sliding grooves 28; the mounting plate 27 is provided with first sliders 31 symmetrically on the front and rear sides; the first sliders 31 are slidably connected to the first sliding grooves 28; the center of the right side of the mounting plate 27 is provided with an upwardly protruding elastic block 29; the top of the mounting groove is fixed with a downwardly protruding limiting block 30; the elastic block 29 is elastically engaged with the limiting block 30; and the left end of the mounting plate 27 is releasably abutted against the mounting plate 27. Thus, a mounting plate 27 for fixing the outer wall of the bottom of the outer casing 1 to the guide rail 8 is provided, making the installation and disassembly of the outer casing 1 and the guide rail 8 more convenient and improving work efficiency. The limiting block 30 and the elastic locking block 29 cooperate with each other to fix the position of the mounting plate 27 after it slides onto the guide rail 8, thereby achieving the snap-fit ​​fixation between the bottom of the outer casing 1 and the guide rail 8. Based on the technical solution described above, a further preferred embodiment is that second sliders 32 are symmetrically arranged on the front and rear sides of the left side of the mounting plate 27. The second sliders 32 are arranged parallel to the top of the first slider 31. Second sliding grooves 33 are opened on the groove walls on the front and rear sides of the left side of the mounting groove. The second sliding grooves 33 are arranged parallel to the top of the first sliding groove 28. The second sliders 32 are slidably connected to the second sliding grooves 33 in a limiting manner. In this way, the addition of the second sliders 32 on the left side of the mounting plate 27 further provides stability for the sliding of the mounting plate 27.

[0055] The above description is only of specific embodiments of the present invention, but should not be construed as the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the design spirit of the present invention should be considered to fall within the scope of protection of the present invention.

Claims

1. A pull-out type fuse, characterized in that: The device includes a housing, an operating handle, a fuse core body, and electrode assemblies. The operating handle has a laterally extending fuse core fixing cavity in its center for mounting the fuse core body. The fuse core body is detachably and elastically embedded in the fuse core fixing cavity. The housing has a handle mounting slot for accommodating the operating handle. The operating handle is reciprocally connected to the handle mounting slot, and its lower middle part is rotatably connected to the upper part of the handle mounting slot. The front and rear sides of the lower end of the operating handle are detachably abutted against the inner wall of the upper part of the housing. Two sets of electrode assemblies are symmetrically fixed on the left and right sides of the handle mounting slot. The two sets of electrode assemblies are detachably snapped onto the left and right ends of the fuse core body. The left and right sides of the housing have wiring ports corresponding to the positions of the electrode assemblies. Wires pass through these wiring ports and connect to the corresponding electrode assemblies. The bottom of the housing is detachably snapped onto a guide rail. The upper left and right sides of the operating handle are provided with limiting pins, and the inner walls of the left and right sides of the handle mounting groove are provided with handle sliding grooves extending vertically. The two limiting pins of the operating handle are respectively slidably connected in the handle sliding grooves corresponding to the positions, and the upper and lower ends of the handle sliding grooves are respectively set as arcs so that the operating handle can swing in the front and back direction after being pulled out. A guide block is provided in the middle of the lower end of the operating handle. Guide grooves are symmetrically provided on the front and rear sides of the handle mounting groove. The front and rear sides of the guide block are slidably connected to the corresponding guide grooves. The thickness of the guide block gradually increases from top to bottom, then gradually decreases to the middle of the guide block. The front and rear edges of the longitudinal section of the upper and middle parts of the guide block are arcs, and the front and rear edges of the longitudinal section of the lower part of the guide block are straight lines.

2. The pull-out fuse according to claim 1, characterized in that: The left end of the core fixing cavity is provided with a slot, and the left end of the core body is detachably fixed and inserted into the slot. The right end of the core fixing cavity is provided with an elastic clamping assembly, which includes an upper elastic clamping piece and a lower elastic clamping piece. The right end of the core body is detachably clamped between the upper elastic clamping piece and the lower elastic clamping piece. The lower surface of the upper elastic clamping piece and the upper surface of the lower elastic clamping piece respectively releasably abut against the right end of the core body.

3. A pull-out fuse according to claim 2, characterized in that: The longitudinal section of the upper elastic clip is a U-shaped opening facing forward. The lower sidewall of the upper elastic clip is inclined from back to front and from top to bottom. The longitudinal section of the lower elastic clip is a U-shaped opening facing backward. The upper sidewall of the lower elastic clip is inclined from front to back and from bottom to top. The lower sidewall of the upper elastic clip and the upper sidewall of the lower elastic clip are respectively releasably elastically abutted against the right end of the molten core body.

4. A pull-out fuse according to claim 1, characterized in that: The electrode assembly includes an electrode plate, a wiring frame, a connecting piece, and a screw. The electrode plate and the wiring frame are fixedly disposed within the housing. The electrode plate includes an integrally formed U-shaped spring piece located on the inner side and a conductor plate located on the outer side. The fused core body is embedded in the U-shaped spring piece, and its front and rear sides are releasably abutted against the inner wall of the U-shaped spring piece, respectively. The longitudinal cross-section of the wiring frame is "U"-shaped, and the longitudinal cross-section of the connecting piece is "U". The conductor plate passes through the wiring frame from the inside to the outside. The lower sidewall of the connecting piece passes through the wiring frame and is located above the conductor plate. A threaded hole is opened on the upper sidewall of the wiring frame, and a through hole is opened on the upper sidewall of the connecting piece to allow the screw to pass through. The screw passes through the threaded hole and is threadedly connected to the upper sidewall of the wiring frame. The lower end of the screw abuts against the upper surface of the lower sidewall of the connecting piece. The conductor is releasably fixed and pressed between the lower sidewall of the connecting piece and the conductor plate.

5. A pull-out fuse according to claim 4, characterized in that: A clamping spring is fitted on the outer side of the U-shaped spring. The inner wall of the clamping spring and the outer wall of the U-shaped spring are in a clamping elastic abutment. The bottom of the clamping spring abuts against the bottom of the outer shell. The lower part of the outer wall of the clamping spring abuts against the inner wall of the outer shell.

6. A pull-out fuse according to claim 5, characterized in that: The clamping spring includes an integrally formed spring body with a longitudinal cross-section of "U" and two clamping arms extending laterally at the front and rear ends of the top of the spring body. The two clamping arms of the clamping spring on the left side extend from left to right from the front and rear ends of the top of the spring body corresponding to the position, and the two clamping arms of the clamping spring on the right side extend from right to left from the front and rear ends of the top of the spring body corresponding to the position. The bottom of the spring body abuts against the bottom of the outer shell, and the inner wall of the spring body, the rear side of the clamping arm on the front side, and the front side of the clamping arm on the rear side elastically abut against the outer wall of the U-shaped spring piece.

7. A pull-out fuse according to claim 4, characterized in that: The housing has two electrode mounting slots for accommodating the electrode assembly. The two electrode mounting slots are symmetrically arranged on the left and right sides of the handle mounting slot. The wiring frame is fixedly embedded in the corresponding electrode mounting slot. The wiring piece can slide up and down through the corresponding electrode mounting slot. The outer surface of the wiring piece slides against the inner wall of the electrode mounting slot. The lead plate passes between the handle mounting slot and the electrode mounting slot.

8. A pull-out fuse according to any one of claims 1-7, characterized in that: The bottom of the outer casing has a first fixing block and a second fixing block on its left and right sides, respectively. The guide rail is located between the first fixing block and the second fixing block. The left side of the guide rail abuts against the right side of the first fixing block, and the right side of the guide rail abuts against the right side of the second fixing block and is fixed by a mounting plate. The interior of the second fixing block has a mounting groove for the mounting plate to slide back and forth in the left and right direction. The groove walls on the front and rear sides of the mounting groove have first sliding grooves. The mounting plate has first sliders symmetrically arranged on the front and rear sides. The first sliders are slidably connected to the first sliding grooves. The center of the right side of the mounting plate has an upwardly protruding elastic block. The top of the mounting groove has a downwardly protruding limiting block fixedly arranged. The elastic block is elastically engaged with the limiting block. The left end of the mounting plate is releasably abutted against the mounting plate.

9. A pull-out fuse according to claim 8, characterized in that: The mounting plate is symmetrically provided with second sliders on the front and rear sides of the left side. The second sliders are arranged parallel to the top of the first slider. The mounting groove is provided with second sliding grooves on the front and rear sides of the left side. The second sliding grooves are arranged parallel to the top of the first sliding grooves. The second sliders are slidably connected to the second sliding grooves in a limiting manner.

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