An overcurrent protection fuse

Abstract

The present application discloses an overcurrent protection fuse, which relates to the technical field of power fuses and includes an insulator, a fixed housing, and a fuse tube. Upper and lower contacts are respectively provided at both ends of the insulator; the fixed housing is electrically connected to the lower contact, there are two fixed housings, and the two fixed housings are symmetrically arranged with respect to the insulator. A closing and opening unit is provided in each of the two fixed housings, and a turning shaft is rotatably arranged between the two fixed housings; one end of the fuse tube is electrically connected to the turning shaft, and the other end is in abutting connection with the upper contact through a pressing assembly; a pulling rope is arranged between the two fixed housings, and the pulling rope can drive the turning shaft to rotate forward or backward through the closing and opening unit. When the turning shaft rotates forward, the fuse tube can be in abutting connection with the upper contact to close the switch, and when the turning shaft rotates backward, the fuse tube can be separated from the upper contact to open the switch. The overcurrent protection fuse provided by the present application can solve the problem of poor contact between the fuse tube and the upper contact that may be caused by different angles of pushing the fuse tube currently.

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:

[0006] An overcurrent protection fuse, comprising an insulator, a fixed housing and a fuse tube. Upper and lower contacts are respectively arranged at two ends of the insulator. The fixed housing is electrically connected to the lower contact. There are two fixed housings, which are symmetrically arranged with respect to the insulator. A turning shaft is rotatably arranged between the two fixed housings. A closing and opening unit is arranged between the turning shaft and the fixed housing. The closing and opening unit includes a wire drum, a first gear set, a second gear set and a switching component. A fixed shaft is arranged in the fixed housing. The first gear set includes a first main gear and a first transmission set. The second gear set includes a second main gear and a second transmission set. The first main gear and the second main gear are both rotatably arranged on the fixed shaft and are respectively close to two ends of the fixed shaft. The first transmission set and the second transmission set are respectively close to two inner side walls of the fixed housing and are respectively in transmission connection with the first main gear and the second main gear. 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 turning shaft to rotate forward and reverse through the first transmission set and the second transmission set. The switching component can control the wire drum to rotate synchronously with the first main gear or synchronously with the second main gear. One end of the fuse tube is electrically connected to the turning shaft, and a pressing component is arranged between the other end and the upper contact. The fuse tube is in abutting connection with the upper contact through the pressing component.

[0007] A pull rope is arranged between the two fixed housings. Two ends of the pull rope are respectively wound on the wire drums in the two fixed housings. Under the action of the switching component, the pull rope can drive the turning shaft to rotate forward or reverse through the first main gear or the second main gear. When the turning shaft rotates forward, the fuse tube can be in abutting connection with the upper contact to close the switch. When the turning shaft rotates in reverse, the fuse tube can be separated from the upper contact to open the switch.

[0008] Further, the switching component includes an electromagnet, a patch and a tension spring. The electromagnet is arranged on one side of the first main gear facing the wire drum. The patch is arranged on one side of the wire drum facing the first main gear. The tension spring is sleeved on the fixed shaft and fixed between the second main gear and the wire drum. First blocks are arranged on two side faces of the wire drum corresponding to the first main gear. Second blocks are arranged on two side faces of the wire drum corresponding to the second main gear.

[0009] When the electromagnet is not powered on, the wire drum is pulled by the tension spring, and the second block on the wire drum can be inserted into the gap between adjacent second blocks on the second main gear, and the second block on the wire drum can be in contact with the second main gear.

[0010] When the electromagnet is energized, the bobbin is pulled by the suction force of the electromagnet, and the first clamping block on the bobbin can be inserted into the gap between adjacent first clamping blocks on the first main gear, and the first clamping block on the bobbin can abut against the first main gear.

[0011] 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 housing, the first transmission wheel meshes with the first main gear, the first driven wheel is connected to the turning shaft through a rotating shaft, and the first driven wheel meshes with the first transmission wheel;

[0012] 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 housing, the second driven wheel is arranged on the rotating shaft, the second main gear meshes with the second transmission wheel, the second transmission wheel meshes with the third transmission wheel, and the third transmission wheel meshes with the second driven wheel.

[0013] Further, the bobbin includes an outer cylinder, an internal ratchet and an internal ratchet pawl. The outer cylinder is coaxially arranged with the internal ratchet. The internal ratchet is sleeved on the fixed shaft and rotatably arranged inside the outer cylinder. The internal ratchet pawl is arranged on the inner cylinder wall of the outer cylinder and meshes with the internal ratchet;

[0014] A rotary mechanism capable of driving the bobbin to rotate is arranged inside the fixed housing. The rotary mechanism includes a reel and a coil spring. The reel is fixed on the side of the outer cylinder away from the first main gear. The coil spring is sleeved on the reel. One end of the inner side of the coil spring is fixed on the reel. One end of the outer side of the coil spring extends out of the reel and is provided with a sliding component between the fixed housing. One end of the outer side of the coil spring is slidably connected to the fixed housing through the sliding component;

[0015] The first clamping block is arranged on one side surface of the internal ratchet facing the first main gear, and the second clamping block is arranged on one side surface of the internal ratchet facing the second main gear.

[0016] Further, a limiting rod parallel to the axial direction of the fixed shaft is arranged inside the fixed housing, and the limiting rod is located on one side of the bobbin;

[0017] The sliding component includes a limiting groove and a limiting block. The limiting groove is opened on the side of the limiting rod facing the bobbin. The length direction of the limiting groove is parallel to the length direction of the limiting rod. The limiting block is fixed on one end of the outer side of the coil spring. The limiting block is adapted to the limiting groove. The limiting block is inserted into the limiting groove and can slide along the length direction of the limiting groove.

[0018] Further, a limiting component is arranged between the fixed shaft and the inner ratchet wheel. The limiting component includes a limiting ratchet wheel and a limiting pawl. The limiting ratchet wheel is sleeved on the fixed shaft and fixedly connected to the fixed shaft. The deflection direction of the tooth grooves on the limiting ratchet wheel is opposite to that of the tooth grooves on the inner ratchet wheel. The limiting pawl is arranged on the inner hole wall of the inner ratchet wheel and can be engaged with the limiting ratchet wheel.

[0019] Further, a quick-release mechanism is arranged between the rotating shaft and the flipping shaft. The quick-release mechanism includes a push plate, a push spring and a limiting block. A limiting groove is formed at one end of the flipping shaft facing the rotating shaft. The limiting block is fixed at one end of the rotating shaft facing the flipping shaft. The limiting block is adapted to the limiting groove. The push plate is fixed in the fixed shell and is located between the first driven wheel and the second driven wheel. The rotating shaft penetrates through the push plate and is slidably connected to the push plate. The push spring is arranged between the push plate and the first driven wheel.

[0020] Further, a counterweight block is arranged on the fixed shell. The counterweight block is slidably arranged on the fixed shell. A connecting rope is arranged between the counterweight blocks on the two fixed shells. The connecting rope is connected to the pulling rope through a hook.

[0021] Further, the pressing component includes a connecting rod and a spring. The connecting rod is fixed at the top end of the insulator. One end of the upper contact is fixed on the connecting rod, and the other end is suspended. The spring is arranged between the upper contact and the connecting rod. Two ends of the spring are respectively fixedly connected to the upper contact and the connecting rod.

[0022] The beneficial effects of the present invention are as follows:

[0023] For an overcurrent protection fuse of the present invention, when performing the closing or opening operation of the fuse tube, the pulling rope is pulled in a direction away from the flipping shaft. The pulling rope can drive the flipping shaft to rotate forward or backward through the closing / opening unit, and then drive the fuse tube to rotate forward or backward. Thus, the end of the fuse tube away from the flipping can rotate to the position of the upper contact or separate from the upper contact, realizing the closing and opening of the fuse tube and the upper contact. The operation during closing and opening of the present invention is relatively simple, and the fuse tube is directly driven by the flipping shaft. When the flipping shaft rotates, it will not be affected by the pulling force direction of the pulling rope. Therefore, the fuse tube will not be affected by the pulling force direction of the pulling rope either. When the fuse tube rotates, the possibility of deviating from the upper contact is avoided, and the possibility of poor contact between the fuse tube and the upper contact can be greatly reduced.

[0024] Further, a coil spring provided on the reel facilitates the rotation of the bobbin, enabling the pull rope to be rewound onto the bobbin after closing or opening the switch. The structure of the ratchet and pawl inside the bobbin ensures that the outer cylinder of the bobbin and the inner ratchet rotate synchronously only when the pull rope is pulled. When the outer cylinder rotates, it does not drive the inner ratchet to rotate, thus having no impact on the rotation of the first main gear and the second main gear, which is more conducive to the recovery of the pull rope and convenient for the next closing or opening operation.

[0025] Further, during the closing operation of the fuse tube, the counterweight can act as part of the pulling force of the pull rope, reducing the force required to pull the pull rope and making the closing operation easier.

[0026] When the closing is completed and the pull rope is released, the pull rope can be rewound onto the bobbin under the action of the coil spring. However, the counterweight can still exert a pulling force on the pull rope at this time. This pulling force can continuously apply a rotational force to the bobbin, the first main gear, and the turning shaft, and thus the fuse tube is indirectly affected by the force exerted by the counterweight, making the fuse tube always tend to rotate towards the upper contact, and enabling the fuse tube and the upper contact to be in closer contact. The closer contact between the fuse tube and the upper contact can improve the anti-wind vibration ability 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.

[0027] When performing the opening operation of the fuse tube, when pulling the pull rope, the counterweight can increase the pulling force of the pull rope, thereby accelerating the separation of the fuse tube from the upper contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 Schematic structural diagram of an overcurrent protection fuse provided by an embodiment of the present invention;

[0030] Figure 2 Front view of an overcurrent protection fuse provided by an embodiment of the present invention with the outer side of the fixed shell removed;

[0031] Figure 3 For Figure 2 Enlarged structural diagram of part A in

[0032] Figure 4Schematic diagram of the structure of the first gear set and part of the second gear set in an overcurrent protection fuse provided by an embodiment of the present invention;

[0033] Figure 5 Front view of the structure of the first gear set and part of the second gear set in an overcurrent protection fuse provided by an embodiment of the present invention;

[0034] Figure 6 For Figure 5 Schematic cross-sectional structure diagram in the B-B direction in;

[0035] Figure 7 For Figure 6 Schematic cross-sectional structure diagram in the C-C direction in;

[0036] Figure 8 For Figure 7 Enlarged structure diagram of part D in;

[0037] Figure 9 Schematic diagram of the structure of an overcurrent protection fuse from another perspective provided by an embodiment of the present invention;

[0038] Figure 10 For Figure 9 Enlarged structure diagram of part E in;

[0039] Figure 11 Front view of an overcurrent protection fuse provided by an embodiment of the present invention with the outer side of the fixed shell not removed;

[0040] Figure 12 For Figure 11 Schematic cross-sectional structure diagram in the F-F direction in;

[0041] Figure 13 For Figure 12 Enlarged structure diagram of part G in.

[0042] In the figure: 100, insulator; 101, upper contact; 102, lower contact; 200, fixed housing; 201, fixed shaft; 210, turning shaft; 211, rotating shaft; 220, slewing mechanism; 221, drum; 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, blocking rod; 500, pull rope; 610, bobbin; 611, outer cylinder; 612, internal ratchet; 6120, limiting assembly; 6121, limiting ratchet; 6122, limiting ratchet pawl; 613, internal ratchet pawl; 621, first main gear; 622, first driving wheel; 623, first driven wheel; 630, first clamping block; 641, patch; 642, electromagnet; 711, second main gear; 712, second driving wheel; 713, third driving wheel; 714, second driven 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 implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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.

[0045] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] As Figures 1 to 2 shown, an overcurrent protection fuse provided by an embodiment of the present invention includes an insulator 100, a fixed housing 200, and a fuse tube 300. Upper and lower contacts 101 and 102 are respectively installed at both ends of the insulator 100. The fixed housing 200 is installed on the lower contact 102 and is electrically connected to the lower contact 102. There are two fixed housings 200, and the two fixed housings 200 are symmetrically arranged with respect to the insulator 100. A closing and opening unit is provided in each of the two fixed housings 200, and a turning shaft 210 is rotatably provided between the two fixed housings 200.

[0047] One end of the fuse tube 300 is electrically connected to the turning shaft 210, and a pressing assembly 400 is provided between the other end and the upper contact 101, and the fuse tube 300 is in abutting connection with the upper contact 101 through the pressing assembly 400. A pull rope 500 is provided between the two closing and opening units. The pull rope 500 can drive the fuse tube 300 to rotate through the closing and opening unit, so that the fuse tube 300 is in abutting connection and closing or disengaging and opening with the upper contact 101.

[0048] 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. Both the upper contact 101 and the lower contact 102 are copper structural members. The upper contact 101 and the lower contact 102 are respectively connected with an upper wiring terminal and a lower wiring terminal, and the upper wiring terminal and the lower wiring terminal are respectively connected to the wires to be connected. The fixed housing 200 can be a metal housing, and it can be a rectangular hollow housing. The turning shaft 210 is a copper shaft body. Both ends of the turning shaft 210 are inserted into the fixed housings 200 at both ends thereof and can rotate on the two fixed housings 200. The pull rope 500 can be a rope made of insulating material. Pulling the pull rope 500 can drive the turning shaft 210 to rotate forward or backward through the closing and opening unit. The rotation of the turning shaft 210 can drive the fuse tube 300 installed thereon to rotate synchronously, so that the end of the fuse tube 300 far from the turning shaft 210 can rotate to the upper contact 101 in the present invention or away from the upper contact 101 in the present invention, and the closing and opening of the fuse tube 300 in the present invention can be realized.

[0049] The operating principle of the present invention is:

[0050] 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 .

[0051] 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;

[0052] 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.

[0053] 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.

[0054] In some embodiments, Figures 3 to 6 As 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 .

[0055] The fixed shaft 201 is a cylindrical shaft parallel to the axial direction of the flipping shaft 210, and the fixed shaft 201 is fixed on one side plate of the fixed housing 200. Both the first gear set and the second gear set are arranged inside the fixed housing 200 and are respectively close to the inner walls on both sides of the fixed housing 200. The wire drum 610, the first main gear 621, the second main gear 711, and the fixed shaft 201 are all coaxially arranged. Both 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 both ends of the fixed shaft 201 on the fixed shaft 201. The wire drum 610 is a cylindrical or wheel-shaped structural member with annular flanges on both sides. The wire drum 610 can both rotate on the fixed shaft 201 and slide on the fixed shaft 201. Both the first transmission group and the second transmission group are assemblies capable of transmitting power and can be composed of several gears meshing in sequence.

[0056] The switching assembly can control the synchronous rotation of the wire drum 610 and the first main gear 621, or the synchronous rotation of the wire drum 610 and the second main gear 711. When the first main gear 621 rotates, through the transmission of the first transmission group, it can drive the flipping shaft 210 to rotate forward, and the closing between the fuse tube 300 and the upper contact 101 can be realized; when the second main gear 711 rotates, through the transmission of the second transmission group, it can drive the flipping shaft 210 to rotate in reverse, and the opening between the fuse tube 300 and the upper contact 101 can be realized.

[0057] In this embodiment, one end of the pulling rope 500 can directly pass through the side wall of the fixed housing 200 and be wound around the wire drum 610 inside the fixed housing 200, and the other end passes through the side wall of another fixed housing 200 and is wound around another wire drum 610. When the fuse tube 300 is not rotated for closing, the pulling rope 500 is in a taut state between the two fixed housings 200. Pulling the pulling rope 500 can drive the wire drum 610 wound at both ends 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 flipping shaft 210 to rotate, realizing the rotation of the fuse tube 300, and further realizing the closing and opening of the present invention.

[0058] In some embodiments, the switching assembly includes an electromagnet 642, a patch 641, and a tension spring 722. The electromagnet 642 is arranged on the side of the first main gear 621 facing the wire drum 610, the patch 641 is arranged on the side of the wire drum 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 wire drum 610. First blocks 630 are arranged on both side surfaces of the wire drum 610 corresponding to the first main gear 621, and second blocks 723 are arranged on both side surfaces of the wire drum 610 corresponding to the second main gear 711.

[0059] Specifically, the patch 641 can be an annular sheet formed of a ferromagnetic material, which can be an iron ring sheet. The patch 641 is sleeved on the fixed shaft 201 and attached to one side of the bobbin 610 facing the first main gear 621. An installation groove is provided on one side of the first main gear 621 facing the bobbin 610. The electromagnet 642 is installed in the installation 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 with a wire, and the wire extends out of the fixed housing 200 and is electrically connected to an external power supply. Of course, the wiring terminal of the electromagnet 642 can also be connected to an adjacent wire.

[0060] Both the first clamping block 630 and the second clamping block 723 are rectangular blocks. A plurality of first clamping blocks 630 are provided on both opposite side surfaces of the first main gear 621 and the bobbin 610. The plurality of first clamping blocks 630 are evenly spaced on a circle centered on the center of the cross-section of the fixed shaft 201. A plurality of second clamping blocks 723 are provided on both opposite side surfaces of the second main gear 711 and the bobbin 610. The plurality of second clamping blocks 723 are evenly spaced on a circle centered on the center of the cross-section of the fixed shaft 201.

[0061] When the electromagnet 642 is not energized, under the pulling of the tension spring 722, 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.

[0062] When the electromagnet 642 is energized, under the pulling of the suction force of the electromagnet 642, 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.

[0063] When implementing this embodiment, during closing, first, the external power supply electrically connected to the electromagnet 642 needs to be turned on. Then, when the electromagnet 642 is energized, it will suck the bobbin 610 provided with the patch 641 to one side of the first main gear 621. Subsequently, the first clamping block 630 on the bobbin 610 is inserted into the gap between adjacent first clamping blocks 630 on the first main gear 621 and contacts the first main gear 621. Then, hook an insulating hook on the pulling rope 500, and then pull the pulling rope 500 in a direction away from the turning shaft 210. The pulling rope 500 drives the bobbin 610 to rotate, thereby enabling the first clamping block 630 to drive the first main gear 621 to rotate. Through the transmission of the first transmission group, the forward rotation of the turning shaft 210 can be achieved. When the turning shaft 210 rotates, it drives the fuse tube 300 to rotate synchronously. When the end of the fuse tube 300 away from the turning shaft 210 rotates to and abuts against the upper contact 101 of the present invention, the closing of the present invention is completed.

[0064] When opening the switch, first, the external power supply electrically connected to the electromagnet 642 needs to be disconnected. The electromagnet 642 no longer exerts an attractive force 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 catch 723 on the bobbin 610 can insert into the gap between adjacent second catches 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 turning shaft 210. The pull rope 500 drives the bobbin 610 to rotate. The second catch 723 can push the second main gear 711 to rotate. Through the transmission of the second transmission group, the reverse rotation of the turning shaft 210 can be achieved, and then the reverse rotation of the fuse tube 300 can be realized, so that the end of the fuse tube 300 away from the turning shaft 210 is separated from the upper contact 101, realizing the opening of the switch of the present invention.

[0065] Of course, a compression spring 721 can also be arranged between the first main gear 621 and the bobbin 610 in this embodiment. 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 more conveniently make the bobbin 610 approach the second main gear 711, avoiding the situation that when there is only one tension spring 722, the second catch 723 on the bobbin 610 cannot be inserted into the corresponding gap between the second catches 723 due to the small pulling force on the bobbin 610.

[0066] In addition, since the direct structural member driving the rotation of the fuse tube 300 is still the turning shaft 210, and the rotation of the turning shaft 210 is not affected by the pulling direction of the pull rope 500, therefore, there will be no situation where the contact between the fuse tube 300 and the upper contact 101 is poor due to the deviation of the fuse tube 300 between the fuse tube 300 and the upper contact 101 in this embodiment.

[0067] 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 arranged on the fixed housing 200. The first transmission wheel 622 meshes with the first main gear 621. The first driven wheel 623 is connected to the turning shaft 210 through a rotating shaft 211. The first driven wheel 623 meshes with the first transmission wheel 622.

[0068] 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 arranged on the fixed housing 200. The second driven wheel 714 is arranged on the rotating shaft 211. The second main gear 711 meshes with the second transmission wheel 712. The second transmission wheel 712 meshes with the third transmission wheel 713. The third transmission wheel 713 meshes with the second driven wheel 714.

[0069] Specifically, the first driving wheel 622, the first driven wheel 623, the second driving wheel 712, the third driving wheel 713, and the second driven wheel 714 are all gears. Among them, connecting shafts parallel to the axial direction of the fixed shaft 201 are fixed on the inner walls of the two side plates of the two fixed cases 200 close to each other. The first driving wheel 622 is rotatably arranged on the connecting shaft through a bearing, and the first driving wheel 622 meshes with the first main gear 621 on the connecting shaft. The first driven wheel 623 is installed on the rotating shaft 211. The rotating shaft 211 is fixed at the end of the turning shaft 210. The rotating shaft 211 is coaxially arranged with the turning shaft 210. The first driven wheel 623 is away from the turning shaft 210 on the rotating shaft 211. The first driven shaft meshes with the first driven wheel 623 on the rotating shaft 211.

[0070] Both the second driving wheel 712 and the third driving wheel 713 are rotatably arranged on the side surface of the fixed case 200 opposite to the first main gear 621 through bearings. The second driven wheel 714 is fixed on the rotating shaft 211 and is located between the first driven wheel 623 and the turning shaft 210, closer to the turning shaft 210. When the second main gear 711 rotates, it can drive the second driven wheel 714 to rotate through the second driving wheel 712 and the third driving wheel 713, and then can drive the turning shaft 210 and the fuse tube 300 to rotate.

[0071] 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 situation. Since the pulling 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 turning shaft 210 to rotate must be opposite to the direction in which the gears in the second transmission group drive the turning shaft 210 to rotate. Thus, the forward and reverse rotation of the turning shaft 210 can be realized, and the normal closing and opening of the present invention can be ensured.

[0072] In some embodiments, as Figures 3 to 8 shown, the bobbin 610 includes an outer cylinder 611, an inner ratchet 612, and an inner ratchet 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 is rotatably arranged inside the outer cylinder 611. The inner ratchet pawl 613 is arranged on the inner cylinder wall of the outer cylinder 611 and can mesh with the inner ratchet 612.

[0073] Inside the fixed housing 200, there is a rotary mechanism 220 capable of driving the bobbin 610 to rotate. The rotary mechanism 220 includes a winding drum 221 and a coil spring 222. The winding drum 221 is fixed on the side of the outer cylinder 611 away from the first main gear 621. The coil spring 222 is sleeved on the winding drum 221. One end of the inner side of the coil spring 222 is fixed on the winding drum 221. One end of the outer side of the coil spring 222 extends out of the winding drum 221 and is provided with a sliding component 240 between it and the fixed housing 200. One end of the outer side of the coil spring 222 is slidably connected to the fixed housing 200 through the sliding component 240.

[0074] Specifically, the outer cylinder 611, the inner ratchet wheel 612, and the fixed shaft 201 are coaxially arranged. The inner ratchet wheel 612 is sleeved on the fixed shaft 201 and can rotate on the fixed shaft 201. The outer cylinder 611 is a cylindrical structural member with a certain thickness. The inner ratchet wheel 612 is located in the inner hole of the outer cylinder 611. Retaining plates can be fixed on both sides of the outer cylinder 611. The retaining plates can prevent the inner ratchet wheel 612 from disengaging from the inner hole of the outer cylinder 611 and can limit the inner ratchet wheel 612 to always move synchronously with the outer cylinder 611. A first groove is formed on the inner hole wall of the outer cylinder 611. The inner ratchet pawl 613 is rotatably arranged in the first groove. The inner ratchet pawl 613 is adapted to the tooth grooves of the inner ratchet wheel 612. The inner ratchet wheel 612 extends out of the first groove and meshes with the inner ratchet wheel 612. The settings of the inner ratchet wheel 612 and the inner ratchet pawl 613 enable only one-way rotation between the outer cylinder 611 and the inner ratchet wheel 612.

[0075] The winding drum 221 can be a cylindrical structural member, and the winding drum 221 is integrally provided with the bobbin 610. The coil spring 222 is sleeved on the winding drum 221. One end of the inner side of the coil spring 222 is fixed on the barrel surface of the winding drum 221. One end of the outer side of the coil spring 222 can extend out of the winding drum 221 and is slidably connected to the fixed housing 200 through the sliding component 240 with the winding drum 221. This enables the coil spring 222 to only store energy on the winding drum 221 when the winding drum 221 rotates, rather than rotating synchronously with the bobbin 610. Due to the resilience of the coil spring 222, no matter how the coil spring 222 stores energy on the winding drum 221, once the bobbin 610 (outer cylinder 611) no longer drives the winding drum 221 to rotate, then the winding drum 221 will be subjected to the restoring force of the coil spring 222 and rotate back.

[0076] The first catch 630 and the second catch 723 are respectively fixed on both sides of the inner ratchet wheel 612 and respectively correspond to the first catch 630 on the corresponding first main gear 621 and the second catch 723 on the second main gear 711. The patch 641 provided on the side wall of the bobbin 610 can be provided on the side wall of the corresponding outer cylinder 611 or the inner ratchet wheel 612. Since there is one-way rotation between the inner ratchet wheel 612 and the outer cylinder 611, when the outer cylinder 611 rotates, the inner ratchet wheel 612 may not drive the first main gear 621 or the second main gear 711 to rotate.

[0077] When the pull rope 500 is wound around the outer cylinder 611, pulling the pull rope 500 enables the outer cylinder 611 to drive the inner ratchet wheel 612 to rotate on the fixed shaft 201 through the inner ratchet pawl 613. At the same time, the outer cylinder 611 also drives the reel 221 to rotate, causing the coil spring 222 to store energy.

[0078] When the pull rope 500 wound around the outer cylinder 611 is released, the restoring force of the coil spring 222 drives the reel 221 to rotate in reverse. The reel 221 drives the outer cylinder 611 to rotate synchronously. Due to the limitation of the one-way rotation between the inner ratchet wheel 612 and the inner ratchet pawl 613, when the outer cylinder 611 rotates, the outer cylinder 611 can only idle on the inner ratchet wheel 612. During the idling process of the outer cylinder 611, the first main gear 621 and the second main gear 711 do not rotate with the rotation of the outer cylinder 611. When the outer cylinder 611 idles, it can rewind the pull rope 500 stretched out from the outer cylinder 611 onto the outer cylinder 611 until all the pull ropes 500 stretched out from the outer cylinder 611 are rewound onto 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.

[0079] When the closing operation of the fuse tube 300 is performed in this embodiment, an external power supply for supplying power to the electromagnet 642 is turned on to make the electromagnet 642 work. The electromagnet 642 attracts the patch 641 on the bobbin 610, causing the bobbin 610 to approach the first main gear 621. The first latch 630 on the inner ratchet wheel 612 is inserted into the gap between the adjacent first latches 630 on the side of the first main gear 621. After that, when the pull rope 500 is pulled, the pull rope 500 drives the outer cylinder 611 to rotate. When the outer cylinder 611 rotates, it drives the coil spring 222 to wind or unwind, and at the same time, the outer cylinder 611 can also drive the inner ratchet wheel 612 to rotate through the inner ratchet pawl 613, thereby realizing the forward rotation of the turning shaft 210 and the fuse tube 300, and further realizing the closing of the fuse tube 300.

[0080] After the fuse tube 300 is closed, the pull rope 500 is released. The reel 221 rotates in reverse under the action of the restoring elastic force of the coil spring 222. Due to the one-way rotation relationship between the inner ratchet wheel 612 and the inner ratchet pawl 613, the outer cylinder 611 rotates synchronously therewith, while the first main gear 621 does not rotate therewith. When the outer cylinder 611 rotates, it can rewind the pull rope 500 onto the corresponding outer cylinder 611, facilitating the stretching of the pull rope 500 next time.

[0081] When performing a switching-off operation on the fuse tube 300, the external power supply for the electromagnet 642 is turned off, and the attraction of the electromagnet 642 to the bobbin 610 is released. When the electromagnet 642 no longer attracts the patch 641, under the elastic force of the tension spring 722, the bobbin 610 will move closer to the second main gear 711, and the inner ratchet wheel 612 will move closer to the second main gear 711 synchronously. The second catch 723 on the inner ratchet wheel 612 is inserted between the second catches 723 on one side of the second main gear 711, pulling the pull rope 500 in the direction away from the turning shaft 210. The pull rope 500 will drive the inner ratchet wheel 612 to rotate through the outer cylinder 611, and then drive the second main gear 711 to rotate. Since there is one more gear in the second transmission group than in the first transmission group, the rotation direction of the second driven wheel 714 is opposite to that of the second main gear 711. The rotation of the second driven wheel 714 can drive the switched-on fuse tube 300 to rotate in reverse, so that the end of the fuse tube 300 away from the turning shaft 210 rotates away from the upper contact 101, realizing the switching-off of the fuse tube 300.

[0082] After the switching-off of the fuse tube 300 is completed, the pull rope 500 is released, and the pull rope 500 is rewound on the outer cylinder 611 under the action of the torsion spring 222 and the winding drum 221, facilitating the stretching of the pull rope 500 next time.

[0083] In some embodiments, as Figures 3 to 8 shown, a limiting rod 230 parallel to the axial direction of the fixed shaft 201 is provided in the fixed housing 200, and the limiting rod 230 is located on one side of the bobbin 610; the sliding assembly 240 includes a limiting groove 241 and a limiting block 242. The limiting groove 241 is opened on the side of the limiting rod 230 facing the bobbin 610, and the limiting block 242 is fixed to one end outside the torsion spring 222. The limiting block 242 is adapted to the limiting groove 241, and when the limiting block 242 is inserted into the limiting groove 241, the sliding of the limiting block 242 in the limiting groove 241 can be realized.

[0084] Specifically, the limiting rod 230 can be fixed to the inner side brackets of the opposite two sides of the fixed housing 200, and the length direction of the limiting rod 230 is parallel to the length direction of the turning shaft 210. When the limiting block 242 provided at one end outside the torsion spring 222 slides in the corresponding limiting groove 241, the torsion spring 222 can be limited from rotating synchronously with the winding drum 221.

[0085] In some embodiments, a limiting assembly 6120 is provided between the fixed shaft 201 and the inner ratchet wheel 612. The limiting assembly 6120 includes a limiting ratchet wheel 6121 and a limiting pawl 6122. The limiting ratchet wheel 6121 is sleeved on the fixed shaft 201 and fixedly connected to the fixed shaft 201. The deflection direction of the tooth grooves on the limiting ratchet wheel 6121 is opposite to the deflection direction of the tooth grooves on the inner ratchet wheel 612. The limiting pawl 6122 is rotatably provided on the inner hole wall of the inner ratchet wheel 612 and can be engaged with the limiting ratchet wheel 6121.

[0086] Since the inner cylinder wall of the outer cylinder 611 contacts 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 fits with the first driving wheel, it may cause looseness or deviation between the fuse tube 300 that has been closed and the upper contact 101, resulting in poor contact between the fuse tube 300 and the upper contact 101. When the inner ratchet 612 fits with the second driving wheel, it may cause the situation that the fuse tube 300 that has been opened is difficult to separate from the upper contact 101.

[0087] The provision of the limiting ratchet 6121 and the limiting pawl 6122, since the deflection direction of the tooth grooves on the limiting ratchet 6121 is opposite to the deflection direction of the tooth grooves on the inner ratchet 612. Therefore, when the outer cylinder 611 idles, the limiting pawl 6122 will be inserted into the tooth grooves of the limiting ratchet 6121, thereby limiting the rotation of the inner ratchet 612, making the rotation of the wire cylinder 610 smoother during closing or opening of the present invention, and the operation of the present invention more stable.

[0088] In some embodiments, as Figures 10 to 13 shown, a quick-release mechanism 800 is provided between the rotating shaft 211 and the flipping shaft 210. 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 flipping shaft 210 facing the rotating shaft 211. The limiting block 830 is fixed at one end of the rotating shaft 211 facing the flipping shaft 210. The limiting block 830 is adapted to the limiting groove. The push plate 810 is fixed within the fixed housing 200 and is located between the first driven wheel 623 and the second driven wheel 714. The rotating shaft 211 passes through the push plate 810 and is slidably connected thereto. The push spring 820 is disposed between the push plate 810 and the first driven wheel 623.

[0089] 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 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 flipping shaft 210 rotates, it can drive the rotating shaft 211 to rotate synchronously. The push plate 810 is a long strip-shaped plate member fixed within the fixed housing 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 disposed through the push plate 810 and can slide axially thereon. The push spring 820 can be disposed between the push plate 810 and the first driven wheel 623 in this embodiment.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In some embodiments, as Figures 8 to 10 shown, a counterweight 250 is provided on the fixed housing 200. The counterweight 250 is slidably arranged on the fixed housing 200. A connecting rope is provided between the counterweights 250 on the two fixed housings 200. The connecting rope is connected to the pulling rope 500 through a hook.

[0096] Specifically, a vertical long rod can be respectively fixed on two opposite side surfaces of the two fixed housings 200. The long rod is perpendicular to the axial direction of the turning shaft 210. The two long rods correspond to each other, and accommodating through grooves are formed on the sides facing each other. The counterweight 250 provided on the fixed housing 200 is inserted into the corresponding accommodating through groove and can slide along the corresponding accommodating through groove. A connecting rope is fixedly connected between the two corresponding counterweights 250 on the two fixed housings 200. A hook is fixedly connected to the connecting rope. One end of the hook far from the connecting rope is connected to the pulling rope 500 arranged between the two fixed housings 200. The connection manner between the hook and the pulling rope 500 can be a fixed connection or the hook of the hook is hooked on the pulling rope 500, and no specific limitation is made here.

[0097] When the present invention performs a closing operation, the electromagnet 642 is energized, the wire cylinder 610 is attracted to the first main gear 621. When pulling the pulling rope 500, the counterweight 250 can act as part of the pulling force, so that the force required for pulling the pulling rope 500 is reduced;

[0098] When the present invention completes the closing operation, the electromagnet 642 is energized, the wire cylinder 610 is attracted to the first main gear 621, and no pulling force is applied to the pulling rope 500 anymore. The pulling rope 500 is rewound on the wire cylinder 610 under the action of the coil spring 222. However, at this time, the counterweight 250 can still apply a pulling force to the pulling rope 500. This pulling force can make the wire cylinder 610, the first main gear 621 and the turning shaft 210 have a certain rotational tendency, so that the fuse tube 300 can always tightly press against the upper contact 101. When encountering weather conditions such as wind and rain, the fuse tube 300 can always apply a certain pressure to the upper contact 101, improving the anti-wind vibration ability of the present invention, improving the connection stability between the fuse tube 300 and the upper contact 101, and preventing the situation that the fuse tube 300 shakes and the contact between the fuse tube 300 and the upper contact 101 becomes poor.

[0099] When the present invention performs an opening operation, the electromagnet 642 is de-energized, the wire cylinder 610 is attracted to the second main gear 711. When pulling the pulling rope 500, the force applied by the counterweight 250 to the pulling rope 500 can accelerate the separation of the fuse tube 300 from the upper contact 101.

[0100] In some embodiments, as Figure 2 and Figure 11As shown in the figure, the pressing component 400 includes 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 both ends of the spring 420 are fixedly connected to the upper contact 101 and the connecting rod 410 respectively.

[0101] The upper contact 101 can be a copper sheet or a copper bar 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 towards the side away from the insulator 100. The spring 420 is fixed between the connecting rod 410 and the upper contact 101.

[0102] 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 being pressed tightly against the upper contact 101, the spring 420 is gradually compressed, and the upper contact 101 will undergo a certain deformation, thereby making the fuse tube 300 abut more tightly against the upper contact 101.

[0103] A stop rod 430 for preventing the fuse tube 300 from deviating from the upper contact 101 is further arranged on the connecting rod 410. The stop rod 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 rod 430 can be a "U"-shaped metal bar. The stop rod 430 is located below the upper contact 101, and the end of the stop rod 430 is fixedly connected to the connecting piece. The open end of the stop rod 430 faces away from the connecting rod 410. When the fuse tube 300 rotates, it can rotate from the open end of the stop rod 430 into the frame structure of the stop rod 430. The stop rod 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 normally abut against the upper contact 101.

[0104] 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 within the protection scope of the present invention.

Claims

1. An overcurrent protection fuse, characterized in that, Including: An insulator (100), with an upper contact (101) and a lower contact (102) respectively arranged at both ends of the insulator (100); A fixed shell (200), the fixed shell (200) is electrically connected to the lower contact (102), there are two fixed shells (200), the two fixed shells (200) are symmetrically arranged with respect to the insulator (100), a turning shaft (210) is rotatably arranged between the two fixed shells (200), and a closing and opening unit is arranged between the turning shaft (210) and the fixed shell (200). The closing and opening unit includes a wire drum (610), a first gear set, a second gear set and a switching component. A fixed shaft (201) is arranged in the fixed shell (200). The first gear set includes a first main gear (621) and a first transmission group. The second gear set 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 both ends of the fixed shaft (201). The first transmission group and the second transmission group are respectively close to the inner walls on both sides of the fixed shell (200) and are respectively in transmission connection with the first main gear (621) and the second main gear (711). The wire drum (610) is rotatably arranged on the fixed shaft (201) and can slide along the fixed shaft (201) between the first main gear (621) and the second main gear (711). The first main gear (621) and the second main gear (711) respectively drive the turning shaft (210) to rotate forward and backward through the first transmission group and the second transmission group. The switching component can control the wire drum (610) to rotate synchronously with the first main gear (621) or with the second main gear (711); A fuse tube (300), one end of the fuse tube (300) is electrically connected to the turning shaft (210), and a pressing component (400) is arranged between the other end and the upper contact (101). The fuse tube (300) is in abutting connection with the upper contact (101) through the pressing component (400); A pull rope (500) is arranged between the two fixed shells (200), and both ends of the pull rope (500) are respectively wound on the wire drums (610) in the two fixed shells (200). Under the action of the switching component, the pull rope (500) can drive the turning shaft (210) to rotate forward or backward through the first main gear (621) or the second main gear (711). When the turning shaft (210) rotates forward, the fuse tube (300) can abut and close with the upper contact (101). When the turning shaft (210) rotates backward, the fuse tube (300) can be separated from the upper contact (101) to open the switch.

2. The over-current protection fuse according to claim 1, characterized in that: The switching component includes an electromagnet (642), a patch (641), and a tension spring (722). The electromagnet (642) is disposed on a side of the first main gear (621) facing the bobbin (610). The patch (641) is disposed 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 disposed on both side surfaces of the bobbin (610) corresponding to the first main gear (621), and second clamping blocks (723) are disposed on both side surfaces of the bobbin (610) corresponding to the second main gear (711). When the electromagnet (642) is not energized, under the pulling of the tension spring (722), the second clamping block (723) on the bobbin (610) can be inserted into a gap between adjacent second clamping blocks (723) on the second main gear (711), and the second clamping block (723) on the bobbin (610) can be in contact with the second main gear (711). When the electromagnet (642) is energized, under the pulling of the suction force of the electromagnet (642), the first clamping block (630) on the bobbin (610) can be inserted into a gap between adjacent first clamping blocks (630) on the first main gear (621), and the first clamping block (630) on the bobbin (610) can be in contact with the first main gear (621).

3. The overcurrent protection fuse according to claim 1, wherein: The first transmission group includes a first transmission wheel (622) and a first driven wheel (623). The first transmission wheel (622) is rotatably disposed on the fixed housing (200). The first transmission wheel (622) meshes with the first main gear (621). The first driven wheel (623) is connected to the turning shaft (210) through a rotating shaft (211). The first driven wheel (623) meshes with the first transmission wheel (622). 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 disposed on the fixed housing (200). The second driven wheel (714) is disposed on the rotating shaft (211). The second main gear (711) meshes with the second transmission wheel (712). The second transmission wheel (712) meshes with the third transmission wheel (713). The third transmission wheel (713) meshes with the second driven wheel (714).

4. The overcurrent protection fuse according to claim 2, wherein: The bobbin (610) includes an outer cylinder (611), an inner ratchet wheel (612) and an inner ratchet pawl (613). The outer cylinder (611) is coaxially arranged with the inner ratchet wheel (612). The inner ratchet wheel (612) is sleeved on the fixed shaft (201) and rotatably arranged inside 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 wheel (612). A slewing mechanism (220) capable of driving the bobbin (610) to rotate is arranged inside the fixed shell (200). The slewing mechanism (220) includes a reel (221) and a coil spring (222). The reel (221) is fixed on one 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 on the reel (221). There is a sliding assembly (240) between the outer end of the coil spring (222) and the fixed shell (200). The outer end of the coil spring (222) is slidably connected to the fixed shell (200) through the sliding assembly (240). The first latch (630) is arranged on one side surface of the inner ratchet wheel (612) facing the first main gear (621). The second latch (723) is arranged on one side surface of the inner ratchet wheel (612) facing the second main gear (711).

5. The overcurrent protection fuse according to claim 4, characterized in that: A limiting rod (230) parallel to the axial direction of the fixed shaft (201) is arranged inside the fixed shell (200). The limiting rod (230) is located on one side of the bobbin (610). The sliding assembly (240) includes a limiting groove (241) and a limiting block (242). The limiting groove (241) is opened on one 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 on the outer end 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).

6. The overcurrent protection fuse according to claim 5, characterized in that: A limiting component (6120) is provided between the fixed shaft (201) and the inner ratchet wheel (612). The limiting component (6120) includes a limiting ratchet wheel (6121) and a limiting pawl (6122). The limiting ratchet wheel (6121) is sleeved on the fixed shaft (201) and fixedly connected to the fixed shaft (201). The deflection direction of the tooth grooves on the limiting ratchet wheel (6121) is opposite to that of the tooth grooves on the inner ratchet wheel (612). The limiting pawl (6122) is arranged on the inner hole wall of the inner ratchet wheel (612) and can be engaged with the limiting ratchet wheel (6121).

7. An overcurrent protection fuse according to claim 3, characterized in that: A quick-release mechanism (800) is provided between the rotating shaft (211) and the flipping shaft (210). The quick-release mechanism (800) includes a push plate (810), a push spring (820) and a limiting block (830). A limiting groove is formed at one end of the flipping shaft (210) facing the rotating shaft (211). The limiting block (830) is fixed at one end of the rotating shaft (211) facing the flipping shaft (210). The limiting block (830) is adapted to the limiting groove. The push plate (810) is fixed in the fixed housing (200) and is located between the first driven wheel (623) and the second driven wheel (714). The rotating shaft (211) penetrates 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 driven wheel (623).

8. An overcurrent protection fuse according to any one of claims 1-7, characterized in that: A counterweight block (250) is provided on the fixed housing (200). The counterweight block (250) is slidably arranged on the fixed housing (200). A connecting rope is provided between the counterweight blocks (250) on the two fixed housings (200). The connecting rope is connected to the pulling rope (500) through a hook.

9. An overcurrent protection fuse according to claim 8, characterized in that: The pressing component (400) includes a connecting rod (410) and a spring (420). The connecting rod (410) is fixed at the top end of the insulator (100). One end of the upper contact (101) is fixed on 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 respectively fixedly connected to the upper contact (101) and the connecting rod (410).

Images