Overcurrent protection fuse

Abstract

The invention discloses an over-current protection fuse, and relates to the technical field of electric power fuses, the over-current protection fuse comprises an insulator, a fixed shell and a fuse tube, two ends of the insulator are respectively provided with an upper contact and a lower contact; the fixed shells are electrically connected with the lower contact, the number of the fixed shells is two, the two fixed shells are symmetrically arranged relative to the insulator, the two fixed shells are internally provided with switching-on and switching-off units, and a turnover shaft is rotatably arranged between the two fixed shells; one end of the fuse tube is electrically connected with the overturning shaft, and the other end of the fuse tube abuts against the upper contact through the abutting assembly. A pull rope is arranged between the two fixed shells, the pull rope can drive the turnover shaft to rotate forwards or reversely through the switching-on and switching-off unit, when the turnover shaft rotates forwards, the fuse tube can abut against the upper contact to be switched on, and when the turnover shaft rotates reversely, the fuse tube can be separated from the upper contact to be switched off. According to the over-current protection fuse provided by the invention, the problem of poor contact between the fuse tube and the upper contact possibly caused by different angles of pushing the fuse tube at present can be solved.

Description

Technical Field

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

[0002] At present, the fuses used outdoors are generally drop-out overcurrent protection fuses, which are mainly used in overhead power distribution systems to provide overcurrent protection, fault current protection and visible indication of fuse action. Because they have intuitive visible fractures and can act as load switches to disconnect load currents when used with load disconnection tools, they create a safe working environment for line inspection and equipment maintenance, and are widely used.

[0003] Since the existing drop-out fuse is loaded on an outdoor high-voltage line, during its installation or fusing and closing process, the worker generally needs to hold the insulating operating rod to close it. When performing the closing operation, when the worker pushes the insulating operating rod, the insulating operating rod may be tilted relative to the fuse. When the inclined insulating operating rod is closed, the direction of the force applied to the fuse tube is different from the direction from the fuse tube to the contact on the fuse, which may cause the connection of the fuse tube on the fuse to be deviated, thereby causing the top of the fuse tube and the contact on the fuse to be loosely connected, which may cause poor contact, and thus may cause certain safety hazards when the fuse is working; and when a fuse is closed, if there are multiple times when the insulating operating rod does not push the fuse tube directly below the fuse, the connection stability between the top of the fuse tube and the contact on the fuse may be reduced due to the wear of the upper contact, and there is also the possibility of shaking between the bottom of the fuse tube and the fuse. Summary of the invention

[0004] The invention provides an overcurrent protection fuse to solve the problem of poor contact between a fuse tube and an upper contact caused by different pushing angles of the fuse tube.

[0005] An overcurrent protection fuse of the present invention adopts the following technical solution: An overcurrent protection fuse comprises an insulator, a fixed shell and a fuse tube, wherein an upper contact and a lower contact are respectively arranged at two ends of the insulator; the fixed shell is electrically connected to the lower contact, two fixed shells are provided, and the two fixed shells are symmetrically arranged about the insulator, a turning shaft is rotatably arranged between the two fixed shells, and a closing and opening unit is arranged between the turning shaft and the fixed shell; one end of the fuse tube is electrically connected to the turning shaft, and a pressing assembly is arranged between the other end and the upper contact, and the fuse tube abuts against the upper contact through the pressing assembly; A pull rope is arranged between the two fixed shells, and the pull rope can drive the flip shaft to rotate forward or reverse through the closing and opening unit. When the flip shaft rotates forward, the fuse tube can abut against the upper contact to close the door; when the flip shaft reverses, the fuse tube can disengage from the upper contact to close the door.

[0006] Furthermore, the closing and opening gate unit includes a wire drum, a first gear group, a second gear group and a switching assembly, a fixed shaft is provided in the fixed shell, the first gear group includes a first main gear and a first transmission group, the second gear group includes a second main gear and a second transmission group, the first main gear and the second main gear are both rotatably arranged on the fixed shaft and are respectively close to the two ends of the fixed shaft, the first transmission group and the second transmission group are respectively close to the inner walls on both sides of the fixed shell and are respectively connected to the first main gear and the second main gear in transmission, the wire drum is rotatably arranged on the fixed shaft and can slide along the fixed shaft between the first main gear and the second main gear, the first main gear and the second main gear respectively drive the flip shaft to rotate forward and reverse through the first transmission group and the second transmission group, and the switching assembly can control the wire drum to rotate synchronously with the first main gear, or to rotate synchronously with the second main gear.

[0007] Further, the switching assembly includes an electromagnet, a patch and a tension spring, the electromagnet is arranged on the side of the first main gear facing the bobbin, the patch is arranged on the side of the bobbin facing the first main gear, the tension spring is sleeved on the fixed shaft and fixed between the second main gear and the bobbin, and first clamping blocks are arranged on both side surfaces of the bobbin corresponding to the first main gear, and second clamping blocks are arranged on both side surfaces of the bobbin corresponding to the second main gear; When the electromagnet is not energized, the second clamping block on the bobbin can be inserted into the gap between the adjacent second clamping blocks on the second main gear under the pulling of the tension spring, and the second clamping block on the bobbin can contact the second main gear; When the electromagnet is energized, the first block on the bobbin can be inserted into the gap between adjacent first blocks on the first main gear under the pull of the electromagnet suction, and the first block on the bobbin can contact the first main gear.

[0008] Further, the first transmission group includes a first transmission wheel and a first driven wheel, the first transmission wheel is rotatably arranged on the fixed shell, the first transmission wheel is meshed with the first main gear, the first driven wheel is connected to the flip shaft through a rotating shaft, and the first driven wheel is meshed with the first transmission wheel; The second transmission group includes a second transmission wheel, a third transmission wheel and a second driven wheel. The second transmission wheel and the third transmission wheel are both rotatably arranged on the fixed shell. The second driven wheel is arranged on the rotating shaft. The second main gear is meshed with the second transmission wheel, the second transmission wheel is meshed with the third transmission wheel, and the third transmission wheel is meshed with the second driven wheel.

[0009] Further, the wire drum comprises an outer cylinder, an inner ratchet and an inner pawl, the outer cylinder is coaxially arranged with the inner ratchet, the inner ratchet is sleeved on the fixed shaft and rotatably arranged in the outer cylinder, and the inner pawl is arranged on the inner cylinder wall of the outer cylinder and meshes with the inner ratchet; A slewing mechanism capable of driving the bobbin to rotate is arranged in the fixed shell, and the slewing mechanism comprises a winding drum and a coil spring, wherein the winding drum is fixed to a side of the outer cylinder away from the first main gear, the coil spring is sleeved on the winding drum, an inner end of the coil spring is fixed to the winding drum, an outer end of the coil spring extends out of the winding drum and a sliding assembly is arranged between the fixed shell, and an outer end of the coil spring is slidably connected to the fixed shell through the sliding assembly; The first clamping block is arranged on a side surface of the inner ratchet facing the first main gear, and the second clamping block is arranged on a side surface of the inner ratchet facing the second main gear.

[0010] Furthermore, a limiting rod parallel to the axial direction of the fixed shaft is provided in the fixed shell, and the limiting rod is located on one side of the bobbin; The sliding assembly includes a limit slot and a limit block, the limit slot is opened on the side of the limit rod facing the wire reel, the length direction of the limit slot is parallel to the length direction of the limit rod, the limit block is fixed to one end of the outer side of the coil spring, the limit block is adapted to the limit slot, the limit block is inserted into the limit slot and can slide along the length direction of the limit slot.

[0011] Furthermore, a limiting component is arranged between the fixed shaft and the inner ratchet, and the limiting component includes a limiting ratchet and a limiting pawl. The limiting ratchet is sleeved on the fixed shaft and fixedly connected to the fixed shaft. The deflection direction of the tooth groove on the limiting ratchet is opposite to the deflection direction of the tooth groove on the inner ratchet. The limiting pawl is arranged on the inner hole wall of the inner ratchet and can engage with the limiting ratchet.

[0012] Furthermore, a quick release mechanism is provided between the rotating shaft and the flip shaft, and the quick release mechanism includes a push plate, a push spring and a limiting block. A limiting groove is provided at one end of the flip shaft facing the rotating shaft, and the limiting block is fixed at one end of the rotating shaft facing the flip shaft, and the limiting block is adapted to the limiting groove. The push plate is fixed in the fixed shell and is located between the first passive wheel and the second passive wheel. The rotating shaft passes through the push plate and is slidably connected to the push plate, and the push spring is arranged between the push plate and the first passive wheel.

[0013] Furthermore, a counterweight block is provided on the fixed shell, and the counterweight block is slidably arranged on the fixed shell. A connecting rope is provided between the counterweight blocks on two fixed shells, and the connecting rope is connected to the pull rope through a hook.

[0014] Furthermore, the pressing assembly includes a connecting rod and a spring, the connecting rod is fixed to the top of the insulator, one end of the upper contact is fixed to the connecting rod, and the other end is suspended, the spring is arranged between the upper contact and the connecting rod, and the two ends of the spring are fixedly connected to the upper contact and the connecting rod respectively.

[0015] The beneficial effects of the present invention are: In an overcurrent protection fuse of the present invention, when the fuse tube is closed or opened, the pull cord is pulled in the direction away from the flip axis, and the pull cord can drive the flip axis to rotate forward or reverse through the closing and opening unit, thereby driving the fuse tube to rotate forward or reverse, thereby enabling the end of the fuse tube away from the flip to rotate to the upper contact or detach from the upper contact, thereby enabling the fuse tube and the upper contact to be closed and opened. The operation of the present invention during closing and opening is relatively simple, and the fuse tube is directly driven by the flip axis, and the flip axis will not be affected by the pulling direction of the pull cord when rotating, so the fuse tube will not be affected by the pulling direction of the pull cord, so that when the fuse tube rotates, the possibility of deviation from the upper contact is avoided, and the possibility of poor contact between the fuse tube and the upper contact can be greatly reduced.

[0016] Furthermore, the winding spring arranged on the winding drum facilitates the rotation of the wire drum, so that the pull rope can be rewound on the wire drum after the closing or opening of the gate is completed, and the structure of the ratchet pawl inside the wire drum makes it possible for the outer drum and the inner ratchet of the wire drum to rotate synchronously only when the pull rope is pulled, and the outer drum does not drive the inner ratchet to rotate when rotating, so that the rotation of the outer drum does not affect the rotation of the first main gear and the second main gear, which is more conducive to the recovery of the pull rope and facilitates the next closing or opening of the gate.

[0017] Furthermore, when the fuse tube is closed, the counterweight block can act as a part of the pulling force of the pull rope, so that the force required to pull the pull rope is smaller, making the closing operation easier; When the closing is completed, the pull rope is released, and the pull rope can be rewound on the bobbin under the action of the winding spring, but the counterweight block can still apply tension to the pull rope at this time, and this tension can continue to apply rotational force to the bobbin, the first main gear and the flip shaft, so that the fuse tube is also indirectly affected by the force applied by the counterweight block, so that the fuse tube always has a tendency to rotate toward the upper contact, which can make the fuse tube and the upper contact more tightly abutted. The fuse tube and the upper contact that are more tightly abutted can improve the wind vibration resistance of the present invention, reduce the influence of the external environment on the fuse tube, improve the connection stability between the fuse tube and the upper contact, and reduce the possibility of poor contact between the fuse tube and the upper contact; When the fuse tube is opened, when the pull rope is pulled, the counterweight block can increase the pulling force of the pull rope, thereby accelerating the fuse tube to separate from the upper contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of the structure of an overcurrent protection fuse provided by an embodiment of the present invention; Figure 2 A front view of an overcurrent protection fuse provided by an embodiment of the present invention with the outer side of a fixed shell removed; Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 A schematic structural diagram of a first gear set and a portion of a second gear set in an overcurrent protection fuse provided in an embodiment of the present invention; Figure 5 A front structural schematic diagram of a first gear set and a portion of a second gear set in an overcurrent protection fuse provided in an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure in the middle BB direction; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure in the CC direction; Figure 8 for Figure 7 A schematic diagram of the enlarged structure of the D part; Fig. 9 A schematic structural diagram of an overcurrent protection fuse from another perspective provided by an embodiment of the present invention; Fig.10 for Fig. 9 A schematic diagram of the enlarged structure of part E in the middle; Fig.11 A front view of the outer side surface of an overcurrent protection fuse without removing a fixed shell provided in an embodiment of the present invention; Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure in the FF direction; Fig.13 for Fig.12 Schematic diagram of the enlarged structure of part G in the middle.

[0020] In the figure: 100, insulator; 101, upper contact; 102, lower contact; 200, fixed shell; 201, fixed shaft; 210, tilting shaft; 211, rotating shaft; 220, rotating mechanism; 221, reel; 222, coil spring; 230, limit rod; 240, sliding assembly; 241, limit groove; 242, limit block; 250, counterweight; 300, fuse tube; 400, pressing assembly; 410, connecting rod; 420, spring; 430, stop rod; 500, pull rope; 610, wire drum; 611, outer cylinder; 612, inner thorn Wheel; 6120, limiting component; 6121, limiting ratchet; 6122, limiting pawl; 613, inner pawl; 621, first main gear; 622, first transmission wheel; 623, first passive wheel; 630, first clamping block; 641, patch; 642, electromagnet; 711, second main gear; 712, second transmission wheel; 713, third transmission wheel; 714, second passive wheel; 721, compression spring; 722, tension spring; 723, second clamping block; 800, quick release mechanism; 810, push plate; 820, push spring; 830, limiting block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in 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.

[0022] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] like Figure 1 to Figure 2 As shown, an overcurrent protection fuse provided by an embodiment of the present invention includes an insulator 100, a fixed shell 200 and a fuse tube 300. An upper contact 101 and a lower contact 102 are respectively installed at both ends of the insulator 100, and the fixed shell 200 is installed on the lower contact 102 and electrically connected to the lower contact 102. There are two fixed shells 200, and the two fixed shells 200 are symmetrically arranged about the insulator 100. A closing and opening unit is arranged in each of the two fixed shells 200, and a turning shaft 210 is rotatably arranged between the two fixed shells 200.

[0025] One end of the fuse tube 300 is electrically connected to the flip shaft 210, and a pressing assembly 400 is provided between the other end and the upper contact 101, and the fuse tube 300 abuts against the upper contact 101 through the pressing assembly 400. A pull rope 500 is provided between the two closing and opening units, and the pull rope 500 can drive the fuse tube 300 to rotate through the closing and opening units, so that the fuse tube 300 abuts against the upper contact 101 to close or disengage the switch.

[0026] Specifically, the insulator 100 is an insulating device capable of withstanding voltage and mechanical stress, and can be selected as a ceramic insulator 100 or a glass insulator 100. The upper contact 101 and the lower contact 102 are both copper structural parts, and the upper contact 101 and the lower contact 102 are respectively connected to the upper terminal and the lower terminal, and the upper terminal and the lower terminal are respectively connected to the wires to be connected. The fixed shell 200 can be a metal shell, which can be a rectangular hollow shell. The flip shaft 210 is a copper shaft body, and the two ends of the flip shaft 210 are respectively inserted into the fixed shells 200 at both ends thereof, and can rotate on the two fixed shells 200. The pull rope 500 can be a rope made of insulating material. Pulling the pull rope 500 can drive the flip shaft 210 to rotate forward or reverse through the closing and opening unit. The rotation of the flip shaft 210 can drive the fuse tube 300 installed thereon to rotate synchronously, so that the end of the fuse tube 300 away from the flip shaft 210 can rotate to the upper contact 101 of the present invention or away from the upper contact 101 of the present invention, thereby realizing the closing and opening of the fuse tube 300 in the present invention.

[0027] The operating principle of the present invention is: First, pull the pull rope 500 in a direction away from the rotating shaft 211 , and the pull rope 500 can drive the flip shaft 210 to rotate forward or reverse through the closing and opening unit. When the flip shaft 210 rotates, the fuse tube 300 installed on the flip shaft 210 can rotate synchronously with the rotating shaft 211 .

[0028] During the forward rotation of the flip shaft 210 , the end of the fuse tube 300 away from the flip shaft 210 can approach the upper contact 101 of the present invention, thereby enabling the fuse tube 300 to be closed; During the reversal of the flip axis 210 , the end of the fuse tube 300 away from the flip axis 210 can be away from the upper contact 101 of the present invention, so that the fuse tube 300 can be opened.

[0029] In the present invention, the fuse tube 300 is driven to rotate not by an external insulating rod or the like, but by pulling the pull rope 500. When the fuse tube 300 rotates with the flip shaft 210, no matter what the direction of pulling the pull rope 500 is, the fuse tube 300 can only be subjected to the traction force applied to the fuse tube 300 by the flip shaft 210. The direction of the traction force is the same as the rotation direction of the fuse tube 300, so that the fuse tube 300 will not deviate from the upper contact 101 regardless of whether it rotates forward or reverse, so that the upper contact 101 and the fuse tube 300 will no longer have a poor contact problem due to the deviation of the fuse tube 300.

[0030] In some embodiments, Figures 3 to 6As shown, the closing and opening unit includes a bobbin 610, a first gear group, a second gear group and a switching assembly. A fixed shaft 201 is provided in the fixed housing 200, and the bobbin 610 is rotatably arranged on the fixed shaft 201. The first gear group includes a first main gear 621 and a first transmission group, and the second gear group includes a second main gear 711 and a second transmission group. The first main gear 621 and the second main gear 711 are both rotatably arranged on the fixed shaft 201 and are respectively close to the two ends of the fixed shaft 201. The bobbin 610 is located between the first main gear 621 and the second main gear 711 and can slide along the fixed shaft 201 between the first main gear 621 and the second main gear 711. The first transmission group and the second transmission group are both arranged on the fixed housing 200 and are close to the inner side plate of the fixed housing 200. The first transmission group and the second transmission group are respectively connected to the first main gear 621 and the second main gear 711. The first main gear 621 and the second main gear 711 drive the flip shaft 210 to rotate forward and reverse through the first transmission group and the second transmission group. The switching assembly can control the synchronous rotation of the bobbin 610 and the first main gear 621 and the synchronous rotation of the bobbin 610 and the second main gear 711 .

[0031] The fixed shaft 201 is a cylindrical shaft parallel to the axial direction of the flip shaft 210, and the fixed shaft 201 is fixed to a side plate of the fixed shell 200. The first gear set and the second gear set are both arranged in the fixed shell 200, and are respectively close to the inner walls on both sides of the fixed shell 200. The bobbin 610, the first main gear 621, the second main gear 711, and the fixed shaft 201 are all arranged coaxially. The first main gear 621 and the second main gear 711 can be rotatably connected to the fixed shaft 201 through bearings, and the first main gear 621 and the second main gear 711 are respectively close to the two ends of the fixed shaft 201 on the fixed shaft 201. The bobbin 610 is a cylindrical body or a wheel body structure with an annular baffle on both sides, and the bobbin 610 can rotate on the fixed shaft 201 and slide on the fixed shaft 201. The first transmission group and the second transmission group are both assemblies that can transmit power, and can be composed of a plurality of gears meshing in sequence.

[0032] The switching assembly can control the bobbin 610 to rotate synchronously with the first main gear 621, or the bobbin 610 to rotate synchronously with the second main gear 711. When the first main gear 621 rotates, the first transmission group can drive the flip shaft 210 to rotate forward, so that the fuse tube 300 and the upper contact 101 can be closed; when the second main gear 711 rotates, the second transmission group can drive the flip shaft 210 to rotate reversely, so that the fuse tube 300 and the upper contact 101 can be opened.

[0033] In this embodiment, one end of the pull rope 500 can directly pass through the side wall of the fixed shell 200 and be wound on the wire drum 610 in the fixed shell 200, and the other end passes through the side wall of another fixed shell 200 and is wound on another wire drum 610. When the fuse tube 300 is not rotated to close, the pull rope 500 is in a taut state between the two fixed shells 200. When the pull rope 500 is pulled, the wire drum 610 wound at both ends thereof can be driven to rotate. Under the action of the switching assembly, the wire drum 610 can rotate synchronously with the first main gear 621 or the second main gear 711, thereby driving the flip shaft 210 to rotate, realizing the rotation of the fuse tube 300, and then realizing the closing and opening of the present invention.

[0034] In some embodiments, the switching assembly includes an electromagnet 642, a patch 641, and a tension spring 722. The electromagnet 642 is disposed on the side of the first main gear 621 facing the bobbin 610, the patch 641 is disposed on the side of the bobbin 610 facing the first main gear 621, and the tension spring 722 is sleeved on the fixed shaft 201 and fixed between the second main gear 711 and the bobbin 610. The first clamping block 630 is disposed on both sides of the bobbin 610 corresponding to the first main gear 621, and the second clamping block 723 is disposed on both sides of the bobbin 610 corresponding to the second main gear 711.

[0035] Specifically, the patch 641 can be an annular sheet formed of a ferromagnetic material, and can be an iron ring sheet. The patch 641 is sleeved on the fixed shaft 201 and attached to the side surface of the bobbin 610 facing the first main gear 621. A mounting groove is provided on the side surface of the first main gear 621 facing the bobbin 610, and the electromagnet 642 is installed in the mounting groove, and the fixed shaft 201 passes through the inner ring of the electromagnet 642. The wiring terminal of the electromagnet 642 can be connected to a wire, and the wire extends out of the fixed shell 200 and is electrically connected to an external power source. Of course, the wiring terminal of the electromagnet 642 can also be connected to an adjacent wire.

[0036] The first clamping block 630 and the second clamping block 723 are both rectangular blocks, and a plurality of first clamping blocks 630 are provided on both sides of the first main gear 621 opposite to the bobbin 610, and the plurality of first clamping blocks 630 are evenly spaced and distributed on a circumference with the cross-sectional center of the fixed shaft 201 as the center. A plurality of second clamping blocks 723 are provided on both sides of the second main gear 711 opposite to the bobbin 610, and the plurality of second clamping blocks 723 are evenly spaced and distributed on a circumference with the cross-sectional center of the fixed shaft 201 as the center.

[0037] When the electromagnet 642 is not energized, the second block 723 on the bobbin 610 can be inserted into the gap between adjacent second blocks 723 on the second main gear 711 under the pulling of the tension spring 722 , and the second block 723 on the bobbin 610 can contact the second main gear 711 .

[0038] When the electromagnet 642 is energized, the first block 630 on the bobbin 610 can be inserted into the gap between adjacent first blocks 630 on the first main gear 621 under the pull of the electromagnet 642 , and the first block 630 on the bobbin 610 can contact the first main gear 621 .

[0039] When this embodiment is implemented, when closing the circuit breaker, firstly, the external power supply electrically connected to the electromagnet 642 needs to be turned on. Then, the electromagnet 642 is energized to suck the wire drum 610 provided with the patch 641 to one side of the first main gear 621. Then, the first clamping block 630 on the wire drum 610 is inserted into the gap between the adjacent first clamping blocks 630 on the first main gear 621 and contacts the first main gear 621. Then, the hook of the insulating material is hooked on the pull rope 500, and then the pull rope 500 is pulled in the direction away from the flip shaft 210. The pull rope 500 drives the wire drum 610 to rotate, and then the first clamping block 630 drives the first main gear 621 to rotate. After the transmission of the first transmission group, the positive rotation of the flip shaft 210 can be realized. When the flip shaft 210 rotates, the fuse tube 300 is driven to rotate synchronously. When the end of the fuse tube 300 away from the flip shaft 210 rotates to the upper contact 101 of the present invention and abuts against it, the closing of the circuit breaker of the present invention is completed. When opening the gate, it is first necessary to disconnect the external power supply electrically connected to the electromagnet 642, and the electromagnet 642 no longer has suction on the patch 641. Under the action of the elastic restoring force of the tension spring 722, the bobbin 610 approaches the second main gear 711. During the process of the bobbin 610 approaching the second main gear 711, the second clamping block 723 on the bobbin 610 can be inserted into the gap between the adjacent second clamping blocks 723 on the second main gear 711 and can contact the second main gear 711; then, the pull rope 500 is pulled in the direction away from the flip shaft 210, and the pull rope 500 drives the bobbin 610 to rotate, and the second clamping block 723 can push the second main gear 711 to rotate. After the transmission of the second transmission group, the flip shaft 210 can be reversed, and then the fuse tube 300 can be reversed, so that the end of the fuse tube 300 away from the flip shaft 210 is separated from the upper contact 101, and the gate of the present invention is opened.

[0040] Of course, in the present embodiment, a compression spring 721 can be further arranged between the first main gear 621 and the bobbin 610. When the electromagnet 642 is energized, the compression spring 721 is compressed. When the electromagnet 642 is de-energized, the elastic restoring force of the compression spring 721 can facilitate the bobbin 610 to approach the second main gear 711 more easily, thereby avoiding the situation where there is only one tension spring 722 and the second clamping block 723 on the bobbin 610 cannot be inserted into the gap between the corresponding second clamping blocks 723 due to the small tension force on the bobbin 610.

[0041] In addition, since the direct structural member driving the fuse tube 300 to rotate is still the flip shaft 210, and the rotation of the flip shaft 210 is not affected by the pulling direction of the pull rope 500, there will be no poor contact between the fuse tube 300 and the upper contact 101 due to deviation of the fuse tube 300 in this embodiment.

[0042] In some embodiments, the first transmission group includes a first transmission wheel 622 and a first driven wheel 623. The first transmission wheel 622 is rotatably set on the fixed shell 200, the first transmission wheel 622 is meshed with the first main gear 621, the first driven wheel 623 is connected to the flip shaft 210 through the rotating shaft 211, and the first driven wheel 623 is meshed with the first transmission wheel 622.

[0043] The second transmission group includes a second transmission wheel 712, a third transmission wheel 713 and a second driven wheel 714. The second transmission wheel 712 and the third transmission wheel 713 are both rotatably set on the fixed shell 200. The second driven wheel 714 is set on the rotating shaft 211. The second main gear 711 is meshed with the second transmission wheel 712, the second transmission wheel 712 is meshed with the third transmission wheel 713, and the third transmission wheel 713 is meshed with the second driven wheel 714.

[0044] Specifically, the first transmission wheel 622, the first passive wheel 623, the second transmission wheel 712, the third transmission wheel 713 and the second passive wheel 714 are all gears. A connecting shaft parallel to the axial direction of the fixed shaft 201 is fixed on the inner walls of the two side plates of the two fixed shells 200 that are close to each other. The first transmission wheel 622 is rotatably arranged on the connecting shaft through a bearing, and the first transmission wheel 622 is meshed with the first main gear 621 on the connecting shaft. The first passive wheel 623 is installed on the rotating shaft 211, and the rotating shaft 211 is fixed to the end of the flip shaft 210. The rotating shaft 211 is coaxially arranged with the flip shaft 210, and the first passive wheel 623 is away from the flip shaft 210 on the rotating shaft 211. The first passive shaft is meshed with the first passive wheel 623 on the rotating shaft 211.

[0045] The second transmission wheel 712 and the third transmission wheel 713 are both rotatably arranged on a side surface of the fixed housing 200 opposite to the first main gear 621 via bearings. The second driven wheel 714 is fixed on the rotating shaft 211 and is located between the first driven wheel 623 and the flip shaft 210, closer to the flip shaft 210. When the second main gear 711 rotates, the second driven wheel 714 can be driven to rotate through the second transmission wheel 712 and the third transmission wheel 713, thereby driving the flip shaft 210 and the fuse tube 300 to rotate.

[0046] In this embodiment, the number of gears in the first transmission group is one less than that in the second transmission group, and the gears in both the first transmission group and the second transmission group are meshed in sequence, and there is no cross meshing. Since the pull rope 500 drives the bobbin 610 to rotate in only one direction, and the number of gears in the first transmission group is one less than that in the second transmission group, the direction in which the gears in the first transmission group drive the flip shaft 210 to rotate must be opposite to the direction in which the gears in the second transmission group drive the flip shaft 210 to rotate, thereby achieving forward and reverse rotation of the flip shaft 210, and ensuring normal closing and opening of the present invention.

[0047] In some embodiments, Figures 3 to 8 As shown, the wire reel 610 includes an outer cylinder 611, an inner ratchet 612 and an inner pawl 613. The outer cylinder 611 is coaxially arranged with the inner ratchet 612. The inner ratchet 612 is sleeved on the fixed shaft 201 and rotatably arranged in the outer cylinder 611. The inner pawl 613 is arranged on the inner cylinder wall of the outer cylinder 611 and can engage with the inner ratchet 612.

[0048] A rotating mechanism 220 capable of driving the bobbin 610 to rotate is provided in the fixed shell 200. The rotating mechanism 220 includes a reel 221 and a coil spring 222. The reel 221 is fixed to a side of the outer cylinder 611 away from the first main gear 621. The coil spring 222 is sleeved on the reel 221. One end of the inner side of the coil spring 222 is fixed to the reel 221. One end of the outer side of the coil spring 222 extends out of the reel 221 and a sliding assembly 240 is provided between the fixed shell 200. One end of the outer side of the coil spring 222 is slidably connected to the fixed shell 200 through the sliding assembly 240.

[0049] Specifically, the outer cylinder 611, the inner ratchet 612 and the fixed shaft 201 are coaxially arranged. The inner ratchet 612 is sleeved on the fixed shaft 201 and can rotate on the fixed shaft 201. The outer cylinder 611 is a cylindrical structure with a certain thickness. The inner ratchet 612 is located in the inner hole of the outer cylinder 611. Blocking plates can be fixed on both sides of the outer cylinder 611. The blocking plates can prevent the inner ratchet 612 from escaping from the inner hole of the outer cylinder 611 and can limit the inner ratchet 612 to always move synchronously with the outer cylinder 611. A first groove is provided on the inner hole wall of the outer cylinder 611. The inner ratchet 613 is rotatably arranged in the first groove. The inner ratchet 613 is adapted to the tooth groove of the inner ratchet 612. The inner ratchet 612 extends out of the first groove and meshes with the inner ratchet 612. The arrangement of the inner ratchet 612 and the inner ratchet 613 allows the outer cylinder 611 and the inner ratchet 612 to only rotate in one direction.

[0050] The reel 221 can be a cylindrical structural member, and the reel 221 is integrally arranged with the bobbin 610. The coil spring 222 is sleeved on the reel 221, and one end of the inner side of the coil spring 222 is fixed on the barrel surface of the reel 221, and one end of the outer side of the coil spring 222 can extend out of the reel 221 and is slidably connected with the reel 221 and the fixed shell 200 through the sliding assembly 240. This makes it possible for the coil spring 222 to only store energy on the reel 221 when the reel 221 rotates, and will not rotate synchronously with the bobbin 610. Due to the restorability of the coil spring 222, no matter how the coil spring 222 stores energy on the reel 221, once the bobbin 610 (outer barrel 611) no longer drives the reel 221 to rotate, the reel 221 will be affected by the restoring force of the coil spring 222 and rotate.

[0051] The first clamping block 630 and the second clamping block 723 are respectively fixed on both sides of the inner ratchet 612, and respectively correspond to the first clamping block 630 on the corresponding first main gear 621 and the second clamping block 723 on the second main gear 711. The patch 641 arranged on the side wall of the bobbin 610 can be arranged on the corresponding side wall of the outer cylinder 611 or the inner ratchet 612. Since the inner ratchet 612 and the outer cylinder 611 are unidirectionally rotatable, when the outer cylinder 611 rotates, the inner ratchet 612 may not drive the first main gear 621 or the second main gear 711 to rotate.

[0052] When the pull rope 500 is wound on the outer cylinder 611, the pull rope 500 is pulled, and the outer cylinder 611 can drive the inner ratchet 612 to rotate on the fixed shaft 201 through the inner pawl 613. At the same time, the outer cylinder 611 also drives the winding drum 221 to rotate, so that the winding spring 222 stores energy; When the pull rope 500 wound on the outer cylinder 611 is loosened, the restoring force of the coil spring 222 will drive the reel 221 to rotate, and the reel 221 will drive the outer cylinder 611 to rotate synchronously. Due to the limitation of the one-way rotation between the inner ratchet 612 and the inner pawl 613, when the outer cylinder 611 rotates, the outer cylinder 611 can only idle on the inner ratchet 612. During the idle rotation of the outer cylinder 611, the first main gear 621 and the second main gear 711 will not rotate with the rotation of the outer cylinder 611. When the outer cylinder 611 is idle, the pull rope 500 stretched out from the outer cylinder 611 can be rewound on the outer cylinder 611 until all the pull ropes 500 stretched out from the outer cylinder 611 are rewound on the corresponding reel 221, which greatly facilitates the handling of the pull rope 500 after the closing operation or the opening operation of the present invention, and is more convenient for the conversion between the closing operation and the opening operation.

[0053] When the present embodiment is performing the closing operation of the fuse tube 300, the external power supply for the electromagnet 642 is turned on to make the electromagnet 642 work, and the electromagnet 642 attracts the patch 641 on the bobbin 610 so that the bobbin 610 is close to the first main gear 621, and the first clamping block 630 on the inner ratchet 612 is inserted into the gap between the first clamping blocks 630 adjacent to the side of the first main gear 621. Then, when the pull rope 500 is pulled, the pull rope 500 drives the outer cylinder 611 to rotate, and when the outer cylinder 611 rotates, the coil spring 222 is wound or loosened. At the same time, the outer cylinder 611 can also drive the inner ratchet 612 to rotate through the inner ratchet 613, thereby realizing the positive rotation of the flip shaft 210 and the fuse tube 300, and then realizing the closing of the fuse tube 300. When the fuse tube 300 is closed, the pull rope 500 is released, and the reel 221 rotates under the action of the restoring elastic force of the coil spring 222. Due to the one-way rotation relationship between the inner ratchet 612 and the inner pawl 613, the outer cylinder 611 rotates synchronously, while the first main gear 621 does not rotate. When the outer cylinder 611 rotates, the pull rope 500 can be rewound onto the corresponding outer cylinder 611, so as to facilitate the next stretching of the pull rope 500. When the fuse tube 300 is opened, the external power supply for the electromagnet 642 is turned off, and the electromagnet 642 is released from the attraction of the bobbin 610. When the electromagnet 642 no longer attracts the patch 641, the bobbin 610 will approach the second main gear 711 under the elastic force of the tension spring 722, and the inner ratchet 612 will approach the second main gear 711 synchronously, and the second clamping block 723 on the inner ratchet 612 is inserted between the second clamping blocks 723 on one side of the second main gear 711, and the bobbin 610 will move away from the flip axis 210. When the pull rope 500 is pulled, the pull rope 500 will drive the inner ratchet 612 to rotate through the outer tube 611, and then drive the second main gear 711 to rotate. Since the second transmission group has one more gear than the first transmission group, the rotation direction of the second driven wheel 714 is opposite to the rotation direction of the second main gear 711. The rotation of the second driven wheel 714 can drive the closed fuse tube 300 to reverse, so that the end of the fuse tube 300 away from the flip axis 210 turns away from the upper contact 101, thereby opening the fuse tube 300.

[0054] After the fuse tube 300 is opened, the pull rope 500 is released, and the pull rope 500 is rewound on the outer cylinder 611 under the action of the coil spring 222 and the reel 221, so as to facilitate the next stretching of the pull rope 500.

[0055] In some embodiments, Figures 3 to 8As shown, a limit rod 230 parallel to the axial direction of the fixed shaft 201 is provided in the fixed shell 200, and the limit rod 230 is located on one side of the bobbin 610; the sliding assembly 240 includes a limit groove 241 and a limit block 242, the limit groove 241 is arranged on the side of the limit rod 230 facing the bobbin 610, the limit block 242 is fixed to one end of the outer side of the coil spring 222, the limit block 242 is adapted to the limit groove 241, and the limit block 242 is inserted into the limit groove 241 to realize the sliding of the limit block 242 in the limit groove 241.

[0056] Specifically, the limiting rod 230 can be fixed to two opposite inner side brackets of the fixed shell 200, and the length direction of the limiting rod 230 is parallel to the length direction of the flip shaft 210. When the limiting block 242 disposed at one end of the outer side of the coil spring 222 slides in the corresponding limiting groove 241, the coil spring 222 can be limited to not rotate synchronously with the reel 221.

[0057] In some embodiments, a limiting assembly 6120 is provided between the fixed shaft 201 and the inner ratchet 612, and the limiting assembly 6120 includes a limiting ratchet 6121 and a limiting pawl 6122. The limiting ratchet 6121 is sleeved on the fixed shaft 201 and fixedly connected to the fixed shaft 201. The deflection direction of the tooth groove on the limiting ratchet 6121 is opposite to the deflection direction of the tooth groove on the inner ratchet 612. The limiting pawl 6122 is rotatably provided on the inner hole wall of the inner ratchet 612 and can mesh with the limiting ratchet 6121.

[0058] Since the inner cylinder wall of the outer cylinder 611 is in contact with the outer wheel surface of the inner ratchet 612, when the outer cylinder 611 idles on the inner ratchet 612, it will inevitably drive the inner ratchet 612 to rotate. When the inner ratchet 612 is in contact with the first driving wheel, it may cause the fuse tube 300 that has completed closing to become loose or deviate from the upper contact 101, resulting in poor contact between the fuse tube 300 and the upper contact 101; when the inner ratchet 612 is in contact with the second driving wheel, it may cause the fuse tube 300 that has completed opening to be difficult to separate from the upper contact 101.

[0059] The setting of the limiting ratchet 6121 and the limiting pawl 6122 is such that, since the deflection direction of the tooth groove on the limiting ratchet 6121 is opposite to the deflection direction of the tooth groove on the inner ratchet 612, when the outer cylinder 611 is idling, the limiting pawl 6122 will be inserted into the tooth groove of the limiting ratchet 6121, thereby limiting the rotation of the inner ratchet 612, so that the wire drum 610 of the present invention can rotate more smoothly when closing or opening the gate, and the operation of the present invention is more stable.

[0060] In some embodiments, Figures 10 to 13As shown, a quick release mechanism 800 is provided between the rotating shaft 211 and the flip shaft 210, and the quick release mechanism 800 includes a push plate 810, a push spring 820 and a limiting block 830. A limiting groove is provided at one end of the flip shaft 210 facing the rotating shaft 211, and the limiting block 830 is fixed at one end of the rotating shaft 211 facing the flip shaft 210. The limiting block 830 is adapted to the limiting groove. The push plate 810 is fixed in the fixed shell 200 and is located between the first passive wheel 623 and the second passive wheel 714. The rotating shaft 211 passes through the push plate 810 and is slidably connected thereto, and the push spring 820 is provided between the push plate 810 and the first passive wheel 623.

[0061] The limiting groove can be a groove body with a special shape such as a square groove or a triangular groove. The limiting block 830 is a block body adapted to the limiting groove. One end of the rotating shaft 211 provided with the limiting block 830 is inserted into the corresponding limiting groove. When the flip shaft 210 rotates, it can drive the rotating shaft 211 to rotate synchronously. The push plate 810 is a long strip-shaped plate fixed in the fixed shell 200. The length direction of the push plate 810 is perpendicular to the axial direction of the rotating shaft 211. The rotating shaft 211 is penetrated on the push plate 810 and can slide on the push plate 810 along its axial direction. In this embodiment, the push spring 820 can be set between the push plate 810 and the first passive wheel 623.

[0062] In this embodiment, the side plate of the fixed shell 200 away from the flip axis 210 is installed on the fixed shell 200 body by detachable parts such as screws. When the fuse tube 300 needs to be replaced, the side plate of the fixed shell 200 away from the flip axis 210 needs to be removed from the fixed shell 200 body first, and then the rotating shaft 211 is pulled in the direction away from the flip axis 210. The rotating shaft 211 drives the first passive wheel 623, the second passive wheel 714 and the limiting block 830 to slide along its axial direction, thereby causing the limiting block 830 to be separated from the corresponding limiting groove. At the same time, the push spring 820 located between the push plate 810 and the first passive wheel 623 is compressed. After the limiting block 830 is separated from the flip axis 210, the flip axis 210 together with the fuse tube 300 can be removed from between the two fixed shells 200 so as to replace a new fuse tube 300.

[0063] Of course, the end of the rotating shaft 211 away from the flip axis 210 can also pass through the side plate of the fixed shell 200 away from the flip axis 210 and extend outside the fixed shell 200. At this time, when disassembling the flip axis 210 and the fuse tube 300, it is necessary to pull the rotating shaft 211 in the direction away from the flip axis 210. The rotating shaft 211 can also drive the limiting block 830 to disengage from the limiting groove, thereby releasing the connection between the rotating shaft 211 and the flip axis 210.

[0064] When a new flip shaft 210 and a new fuse tube 300 are needed, it is only necessary to pull the rotating shaft 211 in the direction away from each other so that the flip shaft 210 can be inserted between the two fixed shells 200. After the flip shaft 210 is reinserted between the two fixed shells 200, release the rotating shaft 211, and then rotate the flip shaft 210. When the flip shaft 210 is rotated, the push spring 820 will always apply a pulling force to the first passive wheel 623 until the limiting block 830 is inserted into the limiting groove, so that the rotating shaft 211 can re-clamp the flip shaft 210, thereby completing the replacement of the flip shaft 210 and the fuse tube 300.

[0065] The quick-release mechanism 800 makes the replacement of the fuse tube 300 of the present invention simpler and faster, and makes the present invention reusable, which greatly reduces the use cost of the present invention.

[0066] It should be noted that, in this embodiment, two side plates of the two fixed shells 200 close to each other are provided with long U-shaped plug holes, and one end of the U-shaped plug hole facing the insulator 100 penetrates the end surface of the corresponding side plate, and the two ends of the flip shaft 210 are respectively inserted into the U-shaped plug hole from the corresponding U-shaped plug hole toward one end of the insulator 100, so as to realize the insertion of the flip shaft 210 between the two fixed shells 200. After the insertion, the flip shaft 210 can rotate around the axial direction of the flip shaft 210 between the two fixed shells 200. When the limiting block 830 cancels the limitation on the flip shaft 210, the flip shaft 210 can be moved from the U-shaped plug hole toward one end of the insulator 100.

[0067] In some embodiments, Figures 8 to 10 As shown, a counterweight 250 is provided on the fixed shell 200 , and the counterweight 250 is slidably arranged on the fixed shell 200 . A connecting rope is provided between the counterweights 250 on the two fixed shells 200 , and the connecting rope is connected to the pull rope 500 through a hook.

[0068] Specifically, a vertical long rod can be fixed on two opposite side surfaces of the two fixed shells 200, and the long rod is perpendicular to the axial direction of the flip shaft 210. The two long rods correspond to each other, and a receiving groove is provided on the side facing each other. The counterweight block 250 arranged on the fixed shell 200 is inserted into the corresponding receiving groove and can slide along the corresponding receiving groove. A connecting rope is fixedly connected between the two counterweight blocks 250 corresponding to the two fixed shells 200, and a hook is fixedly connected to the connecting rope, and the end of the hook away from the connecting rope is connected to the pull rope 500 arranged between the two fixed shells 200. The connection method between the hook and the pull rope 500 can be a fixed connection or a hook of the hook is hooked on the pull rope 500, which is not specifically limited here.

[0069] When the present invention performs a closing operation, the electromagnet 642 is energized, the bobbin 610 is attracted to the first main gear 621, and when the pull rope 500 is pulled, the counterweight 250 can act as a part of the pulling force, so that the force required to pull the pull rope 500 is reduced; When the present invention completes the closing operation, the electromagnet 642 is energized, the bobbin 610 and the first main gear 621 are attracted, and no tension is applied to the pull rope 500. The pull rope 500 is rewound on the bobbin 610 under the action of the coil spring 222. However, the counterweight 250 can still apply tension to the pull rope 500 at this time, and the tension can make the bobbin 610, the first main gear 621 and the flip shaft 210 have a certain rotation tendency, so that the fuse tube 300 can always be pressed against the upper contact 101. When encountering windy, rainy and other weather conditions, the fuse tube 300 can always apply a certain pressure to the upper contact 101, which improves the wind vibration resistance of the present invention, improves the connection stability between the fuse tube 300 and the upper contact 101, and prevents the fuse tube 300 from shaking and causing poor contact between the fuse tube 300 and the upper contact 101.

[0070] When the present invention is in the opening operation, the electromagnet 642 is de-energized, the bobbin 610 is attracted to the second main gear 711 , and when the pull rope 500 is pulled, the force applied by the counterweight 250 to the pull rope 500 can accelerate the fuse tube 300 to separate from the upper contact 101 .

[0071] In some embodiments, Figure 2 and Fig.11 As shown, the pressing assembly 400 includes a connecting rod 410 and a spring 420. The connecting rod 410 is fixed to the top of the insulator 100. One end of the upper contact 101 is fixed to the connecting rod 410, and the other end is suspended. The spring 420 is arranged between the upper contact 101 and the connecting rod 410. The two ends of the spring 420 are fixedly connected to the upper contact 101 and the connecting rod 410 respectively.

[0072] The upper contact 101 can be a copper sheet or copper strip with a certain curvature. One end of the upper contact 101 is fixed to the side of the connecting rod 410 facing the bottom end of the insulator 100, and the end of the upper contact 101 away from the connecting rod 410 extends toward the side away from the insulator 100. The spring 420 is fixed between the connecting rod 410 and the upper contact 101.

[0073] When the fuse tube 300 is closed, the upper end of the fuse tube 300 can rotate to the bottom of the upper contact 101 and can abut against the bottom surface of the upper contact 101. During the process of the fuse tube 300 abutting against the upper contact 101, the spring 420 is gradually compressed and the upper contact 101 will be deformed to a certain extent, thereby making the fuse tube 300 abut against the upper contact 101 more tightly.

[0074] A stop bar 430 capable of preventing the fuse tube 300 from deviating from the upper contact 101 is further provided on the connecting rod 410. The stop bar 430 can be fixed to the connecting rod 410 through a connecting piece and is located between the upper contact 101 and the insulator 100. The connecting piece can be a copper sheet or other metal sheets with strong toughness. The stop bar 430 can be a "U"-shaped metal strip. The stop bar 430 is located below the upper contact 101. The end of the stop bar 430 is fixedly connected to the connecting piece. The open end of the stop bar 430 faces away from the connecting rod 410. When the fuse tube 300 rotates, it can rotate from the open end of the stop bar 430 into the frame structure of the stop bar 430. The stop bar 430 can prevent the fuse tube 300 from deviating from the upper contact 101 when rotating, ensuring that the upper end of the fuse tube 300 can be normally abutted against the upper contact 101.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An overcurrent protection fuse, characterized in that: include: An insulator (100), wherein two ends of the insulator (100) are respectively provided with an upper contact (101) and a lower contact (102); A fixed shell (200), the fixed shell (200) being electrically connected to the lower contact (102), two fixed shells (200) being provided, the two fixed shells (200) being symmetrically arranged about the insulator (100), a flip shaft (210) being rotatably arranged between the two fixed shells (200), and a closing and opening unit being provided between the flip shaft (210) and the fixed shell (200); A fuse tube (300), one end of the fuse tube (300) being electrically connected to the flip shaft (210), and a pressing assembly (400) being provided between the other end and the upper contact (101), and the fuse tube (300) being in contact with the upper contact (101) via the pressing assembly (400); A pull rope (500) is provided between the two fixed shells (200), and the pull rope (500) can drive the flip shaft (210) to rotate forward or reversely through the closing and opening unit. When the flip shaft (210) rotates forward, the fuse tube (300) can abut against the upper contact (101) to close the switch; when the flip shaft (210) rotates reversely, the fuse tube (300) can be disengaged from the upper contact (101) to close the switch.

2. The overcurrent protection fuse according to claim 1, characterized in that: The gate closing and opening unit comprises a wire drum (610), a first gear set, a second gear set and a switching assembly; a fixed shaft (201) is arranged in the fixed housing (200); the first gear set comprises a first main gear (621) and a first transmission set; the second gear set comprises a second main gear (711) and a second transmission set; the first main gear (621) and the second main gear (711) are both rotatably arranged on the fixed shaft (201) and are respectively close to two ends of the fixed shaft (201); the first transmission set and the second transmission set are respectively close to the inner walls on both sides of the fixed housing (200) and are respectively connected to the first main gear (621). The first main gear (621) and the second main gear (711) are connected by transmission; the bobbin (610) is rotatably arranged on the fixed shaft (201) and can slide between the first main gear (621) and the second main gear (711) along the fixed shaft (201); the first main gear (621) and the second main gear (711) respectively drive the flip shaft (210) to rotate forward and reverse through the first transmission group and the second transmission group; the switching component can control the bobbin (610) to rotate synchronously with the first main gear (621) or with the second main gear (711).

3. The overcurrent protection fuse according to claim 2, characterized in that: The switching component comprises an electromagnet (642), a patch (641) and a tension spring (722); the electromagnet (642) is arranged on a side of the first main gear (621) facing the bobbin (610); the patch (641) is arranged on a side of the bobbin (610) facing the first main gear (621); the tension spring (722) is sleeved on the fixed shaft (201) and fixed between the second main gear (711) and the bobbin (610); first clamping blocks (630) are arranged on both side surfaces of the bobbin (610) corresponding to the first main gear (621); and second clamping blocks (723) are arranged on both side surfaces of the bobbin (610) corresponding to the second main gear (711); When the electromagnet (642) is not energized, the bobbin (610) is pulled by the tension spring (722), so that the second clamping block (723) on the bobbin (610) can be inserted into the gap between adjacent second clamping blocks (723) on the second main gear (711), and the second clamping block (723) on the bobbin (610) can abut against the second main gear (711); When the electromagnet (642) is energized, the bobbin (610) is pulled by the suction force of the electromagnet (642), so that the first clamping block (630) on the bobbin (610) can be inserted into the gap between adjacent first clamping blocks (630) on the first main gear (621), and the first clamping block (630) on the bobbin (610) can abut against the first main gear (621).

4. The overcurrent protection fuse according to claim 2, characterized in that: The first transmission group comprises a first transmission wheel (622) and a first driven wheel (623); the first transmission wheel (622) is rotatably arranged on the fixed shell (200); the first transmission wheel (622) is meshed with the first main gear (621); the first driven wheel (623) is connected to the flip shaft (210) via a rotating shaft (211); the first driven wheel (623) is meshed with the first transmission wheel (622); The second transmission group comprises a second transmission wheel (712), a third transmission wheel (713) and a second driven wheel (714); the second transmission wheel (712) and the third transmission wheel (713) are both rotatably arranged on the fixed shell (200); the second driven wheel (714) is arranged on the rotating shaft (211); the second main gear (711) is meshed with the second transmission wheel (712); the second transmission wheel (712) is meshed with the third transmission wheel (713); and the third transmission wheel (713) is meshed with the second driven wheel (714).

5. The overcurrent protection fuse according to claim 3, characterized in that: The wire drum (610) comprises an outer cylinder (611), an inner ratchet (612) and an inner ratchet pawl (613); the outer cylinder (611) and the inner ratchet (612) are coaxially arranged; the inner ratchet (612) is sleeved on the fixed shaft (201) and rotatably arranged in the outer cylinder (611); the inner ratchet pawl (613) is arranged on the inner cylinder wall of the outer cylinder (611) and meshes with the inner ratchet (612); A rotating mechanism (220) capable of driving the bobbin (610) to rotate is provided in the fixed shell (200), and the rotating mechanism (220) comprises a winding drum (221) and a coil spring (222), wherein the winding drum (221) is fixed to a side of the outer cylinder (611) away from the first main gear (621), and the coil spring (222) is sleeved on the winding drum (221), and an inner end of the coil spring (222) is fixed to the winding drum (221), and an outer end of the coil spring (222) extends out of the winding drum (221) and a sliding component (240) is provided between the winding drum (221) and the fixed shell (200), and an outer end of the coil spring (222) is slidably connected to the fixed shell (200) through the sliding component (240); The first clamping block (630) is arranged on a side surface of the inner ratchet (612) facing the first main gear (621), and the second clamping block (723) is arranged on a side surface of the inner ratchet (612) facing the second main gear (711).

6. The overcurrent protection fuse according to claim 5, characterized in that: A limiting rod (230) parallel to the axial direction of the fixed shaft (201) is provided in the fixed shell (200), and the limiting rod (230) is located on one side of the bobbin (610); The sliding assembly (240) comprises a limiting groove (241) and a limiting block (242); the limiting groove (241) is arranged on a side of the limiting rod (230) facing the bobbin (610); the length direction of the limiting groove (241) is parallel to the length direction of the limiting rod (230); the limiting block (242) is fixed to one end of the outer side of the coil spring (222); the limiting block (242) is adapted to the limiting groove (241); the limiting block (242) is inserted into the limiting groove (241) and can slide along the length direction of the limiting groove (241).

7. The overcurrent protection fuse according to claim 6, characterized in that: A limiting assembly (6120) is provided between the fixed shaft (201) and the inner ratchet (612), and the limiting assembly (6120) comprises a limiting ratchet (6121) and a limiting pawl (6122); the limiting ratchet (6121) is sleeved on the fixed shaft (201) and fixedly connected to the fixed shaft (201); the deflection direction of the tooth groove on the limiting ratchet (6121) is opposite to the deflection direction of the tooth groove on the inner ratchet (612); the limiting pawl (6122) is provided on the inner hole wall of the inner ratchet (612) and can mesh with the limiting ratchet (6121).

8. The overcurrent protection fuse according to claim 4, characterized in that: A quick release mechanism (800) is provided between the rotating shaft (211) and the flip shaft (210), and the quick release mechanism (800) includes a push plate (810), a push spring (820) and a limiting block (830). A limiting groove is provided at one end of the flip shaft (210) facing the rotating shaft (211), and the limiting block (830) is fixed at one end of the rotating shaft (211) facing the flip shaft (210). The limiting block (830) is matched with the limiting groove. The push plate (810) is fixed in the fixed shell (200) and is located between the first passive wheel (623) and the second passive wheel (714). The rotating shaft (211) passes through the push plate (810) and is slidably connected to the push plate (810). The push spring (820) is arranged between the push plate (810) and the first passive wheel (623).

9. An overcurrent protection fuse according to any one of claims 1 to 8, characterized in that: A counterweight (250) is provided on the fixed shell (200), and the counterweight (250) is slidably arranged on the fixed shell (200). A connecting rope is provided between the counterweights (250) on the two fixed shells (200), and the connecting rope is connected to the pull rope (500) via a hook.

10. An overcurrent protection fuse according to claim 9, characterized in that: The pressing assembly (400) comprises a connecting rod (410) and a spring (420); the connecting rod (410) is fixed to the top end of the insulator (100); one end of the upper contact (101) is fixed to the connecting rod (410) and the other end is suspended; the spring (420) is arranged between the upper contact (101) and the connecting rod (410); and the two ends of the spring (420) are fixedly connected to the upper contact (101) and the connecting rod (410), respectively.

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