Drop-out fuse

Abstract

The invention provides a drop-out fuse, which belongs to the field of power equipment, and specifically comprises an upper contact, a lower contact, a moving contact assembly and an auxiliary assembly assembly, and is characterized in that the upper contact is used for being connected with the input end of an electric wire; the lower touch head is connected with the output end of a wire; the moving contact assembly is hinged with the lower contact and is used for connecting a fuse; the auxiliary assembly component comprises an auxiliary bracket, can be overturned and is provided with a bracket, and the moving contact component is coupled with the bracket in the upward overturning process of the auxiliary bracket; the characteristic that the auxiliary bracket in the auxiliary assembly component can turn over is utilized, thrust is applied to the moving contact component through the auxiliary bracket, a joystick is not needed to directly act on the moving contact component, the supporting groove is formed in the auxiliary bracket, and the moving contact component is coupled in the supporting groove in the process of pushing the moving contact component, so that the moving contact component is prevented from being damaged. In the process, the moving contact assembly cannot move laterally, so that the stability of the moving contact assembly is ensured, and the moving contact assembly is ensured to accurately move towards a target.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of power equipment, and particularly relates to a drop-out fuse. BACKGROUND

[0002] As a classic high-voltage outdoor protective appliance, the drop-out fuse has been applied in the distribution network for a long time and widely. It can provide the devices such as distribution transformers, branch lines and capacitor banks on overhead lines with the functions of overcurrent protection, short-circuit fault isolation and visible disconnecting point.

[0003] In the existing drop-out fuse, a fuse wire is connected with the input end and the output end of an electric wire, and the main body of the fuse wire is located in a movable contact assembly. The main body of the movable contact assembly is a fuse tube, the fuse wire passes through the fuse tube, and the fuse tube is usually made of epoxy glass cloth tube or similar material and is lined with gas generating arc extinguishing material (such as mulberry paper or organic polymer) on the inner wall. When the system is normally operated, the fuse tube is locked between the upper and lower contacts to form a conductive path. When a short-circuit or serious overload fault occurs in the protected line, the fuse wire is rapidly fused by the fault current, at which time the fuse tube is turned downward and dropped to form an obvious visible air insulation break that meets the safety isolation requirements.

[0004] However, when the existing drop-out fuse is installed after the fuse wire is replaced, the fuse tube generally needs to be pushed upward so that the fuse tube can be turned upward. Since the fuse tube is a detachable connection structure, there is a gap between the fuse tube and the lower contact. During the movement of the fuse tube, if the operation is improper, the fuse tube may not be accurately moved, which can easily result in the failure to install the fuse tube. If the fuse tube repeatedly contacts the upper contact, the service life of the fuse wire can be reduced. SUMMARY

[0005] The present application aims to provide a drop-out fuse, which can make the movable contact assembly more stable during the turning movement and facilitate the installation and disassembly of the movable contact assembly.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is a drop-out fuse, which comprises an upper contact, a lower contact, a movable contact assembly and an auxiliary assembly. The upper contact is used to connect the input end of an electric wire; the lower contact is used to connect the output end of the electric wire; the movable contact assembly is hinged to the lower contact and is used to connect a fuse wire; and the auxiliary assembly can apply a force to the movable contact assembly to turn the movable contact assembly upward so that the upper end of the movable contact assembly can be coupled with the upper contact. The auxiliary assembly comprises an auxiliary bracket, which can be turned and is provided with a bracket groove. During the turning of the auxiliary bracket, the movable contact assembly is coupled with the bracket groove.

[0007] Further, the upper contact head comprises a vertical pressure contact strip plate, and a reset member is connected to the vertical pressure contact strip plate to exert a downward force on the vertical pressure contact strip plate.

[0008] Further, the lower contact head comprises a steel support and a horizontal pressure contact plate, the steel support is detachably connected to the movable contact assembly, and the horizontal pressure contact plate is located above the steel support and is in close contact with the lower end of the movable contact assembly when the upper end of the movable contact assembly is coupled to the upper contact head.

[0009] Further, the movable contact assembly comprises a fuse tube, a top positioning member, and a bottom positioning frame, the fuse tube is used to pass through the fuse and perform arc extinguishing treatment on the blown fuse, the top positioning member is hinged to the upper end of the fuse tube and is capable of being connected to the upper end of the fuse, and the bottom positioning frame is installed at the lower end of the fuse tube, is detachably connected to the steel support, is capable of being connected to the lower end of the fuse, and is capable of abutting against the horizontal pressure contact plate.

[0010] Further, the steel support is provided with a connecting aperture, a rotating pin is fitted in the connecting aperture, the rotating pin is fixed to the bottom positioning frame, and the rotating pin is capable of being moved out of the connecting aperture.

[0011] Further, the bottom positioning frame comprises a front seat, the front seat is capable of being connected to the lower end of the fuse tube, and a wire pressing assembly is arranged on the front seat to exert a downward force on the fuse.

[0012] Further, the wire pressing assembly comprises a fuse pressing block and a control rod, the fuse pressing block is located above the fuse, the control rod is connected to the front seat and is capable of being vertically moved when being screwed, and the control rod is capable of exerting a downward force on the fuse pressing block when being moved downward.

[0013] Further, the wire pressing assembly further comprises a guide rod and a compression reset spring, the guide rod is connected to the fuse pressing block and is movably connected to the control rod, and the compression reset spring is sleeved on the guide rod and is located between the control rod and the fuse pressing block, and the control rod is capable of compressing the compression reset spring when being vertically moved.

[0014] Further, a guide channel is arranged in the control rod, and the guide rod is capable of being inserted into the guide channel.

[0015] Further, the auxiliary assembly further comprises an inner positioning arm, a stabilizing frame, and a spanning frame, the spanning frame is connected to the lower end of the inner positioning arm and is hingedly connected to the auxiliary bracket, and the stabilizing frame is connected to the upper end of the inner positioning arm and is connected to the vertical pressure contact strip plate through the stabilizing frame.

[0016] Further, the spanning frame comprises two staggered frames, the two staggered frames are symmetrically arranged, each staggered frame is connected to a wire winding wheel, the wire winding wheel is rotatable and is connected to the end of the auxiliary bracket, and the wire winding wheel is wound with a pull wire.

[0017] Further, the misalignment frame comprises an extension straight pipe and an inclined extension rod, the extension straight pipe is connected to the lower end of the inner positioning arm; the upper end of the inclined extension rod is fixed on the extension straight pipe body, and the lower end is connected with the winding wheel.

[0018] Further, the misalignment frame is connected with a pressure component, the pull wire can pass through the pressure component, and the downward force can be applied to the pull wire through the pressure component to rotate the winding wheel.

[0019] Further, the pressure component comprises a hanger and a pulley, the hanger has an upper opening; The pulley is located in the upper opening of the hanger and is connected with the hanger through a center shaft; The pull wire is located below the pulley.

[0020] Further, the auxiliary bracket comprises a short arm rod and a supporting rod, the short arm rod is connected with the winding wheel; The supporting rod is fixed on the short arm rod; a supporting groove is arranged at the middle position of the supporting rod; When the winding wheel rotates, the action force can be applied to the movable contact assembly through the supporting rod. Compared with the prior art, the beneficial effects of the present application are as follows: when it is necessary to turn the movable contact assembly upward, the auxiliary bracket in the auxiliary assembly can be turned over, the movable contact assembly is pushed by the auxiliary bracket, the operating rod does not directly act on the movable contact assembly, and the supporting groove is arranged on the auxiliary bracket, the movable contact assembly is coupled in the supporting groove during the pushing process of the movable contact assembly, the movable contact assembly cannot move laterally in this process, so that the stability of the movable contact assembly is ensured, and the accurate movement of the movable contact assembly is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view structure schematic diagram of the present application; Figure 2 It is a movable contact assembly structure schematic diagram of the present application; Figure 3 It is a wire pressing assembly structure schematic diagram of the present application; Figure 4 It is a steel support structure schematic diagram of the present application; Figure 5 It is an auxiliary assembly structure schematic diagram of the present application; Figure 6 It is an inner support arm structure schematic diagram of the present application; Figure 7 It is a pressure component structure schematic diagram of the present application; Figure 8 It is a lead hanger and inner support arm connection schematic diagram of the present application; Figure 9 It is an auxiliary bracket structure schematic diagram of the present application.

[0022] Wherein, 1-insulating support, 2-upper support arm, 3-lower support arm, 4-longitudinal pressure contact strip plate, 5-wire inlet frame, 6-wiring terminal, 7-rainproof cover, 8-resetting member, 9-attached hook, 10-cross contact pressure plate, 11-wire outlet frame, 12-steel support, 13-connection gap, 14-fuse tube, 15-lower copper sleeve, 16-rotating pin, 17-protruding part, 18-front seat, 19-rear seat, 20-fuse pressure block, 21-recessed groove, 22-regulating rod, 23-pressing disc, 24-guiding rod, 25-compression resetting spring, 26-upper end sleeve, 27-conducting plate, 28-positioning boss, 29-connection column, 30-interior bracing short plate, 31-mounting support, 32-pull rod, 33-back plate, 34-side guard plate, 35-butting short plate, 36-annular groove, 37-cross bracing arm, 38-interior positioning arm, 39-extended straight pipe body, 40-inclined extension rod, 42-winding wheel, 43-sliding rod, 44-hanging bracket, 45-pulley, 46-pull ring, 47-middle redirection channel, 48-lower displacement channel, 49-longitudinal hanger rod, 50-tilting rod, 51-top rod, 52-guiding block, 53-short arm rod, 54-supporting rod, 55-supporting groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0024] In the description of the present application, it should be noted that unless specifically defined and limited, the terms “mounting”, “connection” and “linking” should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Reference Figures 1 to 4As shown, a kind of drop-out fuse, embodiment one, including insulating support 1, as cylindrical insulator, as main support, ensure the insulation between live part and mounting bracket 31, be provided with upper contact assembly and lower contact assembly on insulating support 1, upper contact assembly and lower contact assembly are respectively set in the position of both ends of insulating support 1, connecting with movable contact assembly between upper contact assembly and lower contact assembly, both ends of movable contact assembly can be docked with corresponding upper contact assembly and lower contact assembly, finally form a passage, i.e. current can enter from one touch dynamic head, the current can be exported by another touch dynamic head after passing through movable contact assembly, at this time, the overcurrent protection of line and equipment is formed by movable contact assembly, when line or equipment (such as power transformer, voltage transformer, capacitor, etc.) passes through the current exceeding its rated capacity for a long time, the fuse in the fuse will be fused after a period of time, prevent the insulation damage of equipment due to overheating, and then the movable contact assembly can be disassembled to replace the fuse, and the movable contact assembly is connected with the upper touch head and the lower touch head, and the passage can be formed again.

[0026] Wherein the insulating support 1 is provided with two supporting arms, the two supporting arms are respectively close to the both ends of the insulating support 1, and are specifically divided into an upper supporting arm 2 and a lower supporting arm 3, the upper supporting arm 2 and the lower supporting arm 3 are provided with a docking hole, and the insulating support 1 is connected with the upper contact assembly and the lower contact assembly through the two supporting arms; Wherein the upper contact assembly includes a longitudinal pressure contact strip plate 4, the longitudinal pressure contact strip plate 4 is made of copper material and can be bent and has elasticity, a wire inlet frame 5 is arranged above the longitudinal pressure contact strip plate 4, the wire inlet frame 5 is provided with a wiring end 6, and the wire can be connected with the wire inlet frame 5, and a rain cover 7 can be arranged above the longitudinal pressure strip plate, and the rain cover 7 can cover the longitudinal pressure contact strip plate 4 and form a certain protection for the longitudinal pressure contact strip plate 4.

[0027] A positioning groove is arranged on the longitudinal pressure contact strip plate 4, and a reset member 8 is connected to the longitudinal pressure contact strip plate 4, and the reset member 8 is located between the longitudinal pressure contact strip plate 4 and the rain cover 7, so that the reset member 8 exerts pressure on the movable contact assembly when the upper contact assembly is docked with the movable contact assembly, thereby increasing the docking stability of the longitudinal pressure contact strip plate 4 and the movable contact assembly.

[0028] In order to facilitate the installation and disassembly of the movable contact assembly, an auxiliary hook 9 can be detachably connected to the above-mentioned supporting arm, and the auxiliary hook 9 can be connected and matched with the drop lever, so as to facilitate the disassembly and installation of the movable contact assembly through the drop lever, and the safety is increased.

[0029] The lower contact assembly comprises a horizontal contact pressing plate 10 and an outlet support 11, and the outlet support 11 is also provided with a connecting terminal 6, and the electric wire can be connected to the connecting terminal 6, and the horizontal contact pressing plate 10 is connected to the outlet support 11, and when the upper end of the movable contact assembly is contacted with the vertical contact strip plate 4 and the lower end of the movable contact assembly is contacted with the horizontal contact pressing plate 10, the electric current can enter from the inlet support 5, then pass through the movable contact assembly, and finally flow out from the connecting terminal 6 of the outlet support 11, thereby forming a passage.

[0030] The horizontal contact pressing plate 10 is connected with a steel support 12, the steel support 12 is located below the horizontal contact pressing plate 10, the steel support 12 can be connected with the lower supporting arm 3, and the steel support 12 is provided with a connecting gap 13 for connecting the movable contact assembly; When the movable contact assembly is installed, the lower end of the movable contact assembly is connected with the steel support 12, then the movable contact assembly is turned over by the drop control rod, and finally the upper end of the movable contact assembly is coupled with the vertical contact strip plate 4.

[0031] The movable contact assembly comprises a fuse tube 14, both ends of the fuse tube 14 are open, the inner wall of the fuse tube 14 is connected with an arc extinguishing tube, the arc extinguishing tube can extinguish the arc of the fuse, the fuse can pass through the arc extinguishing tube, the upper end of the fuse tube 14 is provided with a top positioning member, the lower end of the fuse tube 14 is connected with a lower copper sleeve 15, the lower copper sleeve 15 is connected with a bottom positioning frame, the bottom positioning frame is fixed with a rotating pin 16 and a protruding part 17, when the movable contact assembly needs to be connected with the lower contact, the rotating pin 16 enters the connecting gap 13, thereby realizing the connection between the bottom positioning frame and the steel support 12; The protruding part 17 is in a cylindrical shape, the extending direction of the protruding part 17 is perpendicular to the extending direction of the fuse tube 14, the protruding part 17 is provided with external threads and is screwed with a locking nut, the lower end of the fuse can be wound on the protruding part 17, then the locking nut is rotated to realize the locking and positioning of the lower end of the fuse, when the upper end of the movable contact assembly is coupled with the upper contact assembly, the end of the protruding part 17 is abutted against the horizontal contact pressing plate 10, and the horizontal contact pressing plate 10 is slightly deformed, so that the horizontal contact pressing plate 10 has a certain restoring force, thereby keeping the protruding part 17 and the horizontal contact pressing plate 10 in close connection; The bottom positioning frame comprises a front seat 18 and a rear seat 19, the front seat 18 can be connected with the lower copper sleeve 15, so that there is a certain spacing between the rear seat 19 and the lower copper sleeve 15, the rotating pin 16 and the protruding part 17 are arranged on the rear seat 19, and a wire pressing assembly is also arranged on the front seat 18, the wire pressing assembly can make the broken fuse fall down, so that the fuse is moved out of the arc extinguishing tube; The wire pressing assembly comprises a fuse pressing block 20, and a recessed groove 21 is arranged on the front seat 18 and extends upward from the bottom surface of the front seat 18, the fuse pressing block 20 is arranged in the recessed groove 21, and a threaded hole is arranged on the front seat 18 and extends downward from the upper end of the front seat 18 and finally communicates with the recessed groove 21, a limiting groove is arranged on the fuse pressing block 20, so that the fuse can be arranged in the limiting groove, and the upper end of the fuse is connected with the top positioning member, and the lower end of the fuse is connected with the protrusion 17 on the bottom positioning frame, so that the fuse supports the fuse pressing block 20, at this time, the fuse needs to bear the weight of the fuse pressing block 20, and the fuse pressing block 20 can move vertically in the recessed groove 21, so that when the fuse is melted, the melting point of the fuse moves downward under the influence of the gravity of the fuse pressing block 20, thereby avoiding the adhesion of the outgoing wire. The inner wall of the recessed groove 21 is provided with a longitudinal sliding groove, and the fuse pressing block 20 is provided with a clamping sliding block which is matched in the sliding groove, when the fuse pressing block 20 moves longitudinally in the recessed groove 21, the clamping sliding block also moves longitudinally in the sliding groove, when the clamping sliding block moves to the lowermost position of the sliding groove, it cannot continue to move downward, that is, the length of the sliding groove limits the maximum displacement distance of the fuse pressing block 20.

[0032] In order to ensure that the melting point of the fuse can move downward, a regulating rod 22 is connected to the front seat 18, the regulating rod 22 is a component of the wire pressing assembly, a pressure plate 23 is arranged at the lower end of the regulating rod 22, and the regulating rod 22 is screwed with the threaded hole, when the regulating rod 22 rotates, the pressure plate 23 can move downward, and the pressure plate 23 applies a downward thrust to the fuse pressing block 20, so that a strong force can be applied to the fuse, and the size of the force is controllable, but manual adjustment is needed at this time, which is mainly suitable for the case that the top end of the fuse is adhered to the nearby position after the fuse is melted. A guide rod 24 is arranged on the fuse pressing block 20 and fixed to the upper surface of the fuse pressing block 20, a center hole is arranged on the pressure plate 23, a guide channel is arranged in the regulating rod 22 and extends upward from the lower end of the regulating rod 22, the guide channel is aligned with the center hole, the guide rod 24 passes through the center hole and enters the guide channel, and a compression reset spring 25 is sleeved on the guide rod 24 and located between the disc and the fuse pressing block 20, so that after the movable contact assembly is connected with the two ends of the fuse, the distance between the pressure plate 23 and the fuse pressing block 20 can be adjusted by rotating the regulating rod, so that the compression reset spring 25 is compressed, at this time, the pressure plate 23 is not in direct contact with the fuse pressing block 20, and when the fuse is melted, the fuse pressing block 20 moves downward under the restoring force of the compression reset spring 25, so as to apply a downward force to the fuse.

[0033] The top positioning member in the application comprises an upper end sleeve 26, a conductive plate 27 is hinged on the upper end sleeve 26, a positioning boss 28 and a connecting column 29 are arranged on the conductive plate 27, the upper end of the fuse can be wound on the connecting column 29, then the fuse is locked through the screwing of the nut and the connecting column 29, the positioning boss 28 and the connecting column 29 are arranged on the upper surface of the conductive plate 27, the height of the positioning boss 28 is greater than the height of the connecting column 29, the positioning boss 28 is close to the outer end of the conductive plate 27, an inner support short plate 30 is butted on the conductive plate 27, the end of the inner support short plate 30 has a gap, when the fuse is connected with the positioning boss 28, the local fuse is located in the gap of the inner support short plate 30, meanwhile, a counterweight protrusion is arranged on the conductive plate 27, the counterweight protrusion is close to the outer end of the conductive plate 27, the overall center of the conductive plate 27 is close to the outer end of the conductive plate 27, when the fuse is fused, the conductive plate 27 can be turned down, at this time, since the horizontal resistance pressing plate 10 is slightly deformed when it is coupled with the protruding part 17, under the action of the restoring force, the fuse tube 14 can be turned over.

[0034] In the technical solution, the insulating support 1 is fixed with a mounting bracket 31, the mounting bracket 31 is connected with a back plate 33 through a pull rod 32, at this time, a horizontal interval is formed between the back plate 33 and the mounting bracket 31, a pressing pad is arranged in the horizontal interval, and the insulating support 1 can be installed on the telegraph pole through the cooperation of the mounting bracket 31, the back plate 33 and the pressing pad.

[0035] In addition, the steel support 12 comprises two side guards 34 and an abutting short plate 35, the abutting short plate 35 is connected with the support arm through a bolt assembly, the abutting short plate 35 is located between the two side guards 34, the connecting aperture 13 is located on the side guard 34, the connecting aperture 13 extends downward from the upper side of the side guard 34, a ring groove 36 is arranged on the outer side of the side guard 34, the center of the ring groove 36 is located at the bottom end of the connecting aperture 13, a anti-falling cover is fixed on the outer end of the rotating pin 16, when the rotating pin 16 is moved from the connecting aperture 13 to the bottom end position of the connecting aperture 13, the anti-falling cover is in the concentric state with the ring groove 36, a clamping short column is arranged on the anti-falling cover, the ring groove 36 extends in the circumferential direction, and there is a distance between the head and the tail, when the rotating pin 16 is moved from the connecting aperture 13 and the fuse tube 14 is moved around the rotating pin 16, the clamping short column can enter from the head of the ring groove 36, at this time, the rotating pin 16 cannot be moved out of the connecting aperture 13, so that the movable contact assembly cannot fall off.

[0036] In the embodiment two, referring to Figures 5 to 7 On the basis of the above structure, the insulating support 1 is installed with an auxiliary assembly, the auxiliary assembly can help the installation and disassembly of the movable contact assembly.

[0037] The auxiliary assembly comprises a cross arm 37 fixedly connected with the insulating support 1, an inner positioning arm 38 fixed at the end of the cross arm 37 and parallel to the insulating support 1, a stabilizing frame installed at the upper end of the inner positioning arm 38 and connectable with the longitudinal press strip plate 4, a cross frame provided at the lower end of the inner positioning arm 38 and crossed by the lower arm 3, and an auxiliary bracket connected with the cross frame, which is initially in a vertical state and can be flipped, and when the movable contact assembly is in a falling state, the auxiliary bracket and the movable contact assembly are both in a vertical state, at which time the auxiliary bracket is controlled to be flipped upward, thereby achieving installation of the movable contact assembly. It should be noted that the auxiliary bracket should not be too large and should be able to apply a pushing force to the lower part of the movable contact assembly when flipped upward. In order to flip the auxiliary bracket upward, the cross frame comprises two symmetrically arranged staggered frames with the steel support 12 located therebetween. The staggered frame comprises an extending straight pipe body 39 and an inclined extending rod 40, the upper end of the inclined extending rod 40 being fixedly connected with the extending straight pipe body 39, the upper end of the extending straight pipe body 39 being butted against the lower end of the inner positioning arm 38, the end of the auxiliary bracket being shaft-connected with the inclined extending rod 40 through a winding wheel 42, a short-range hole being provided in the inner positioning arm 38 and butted against the extending straight pipe body 39, and a slide rod 43 being inserted into the extending straight pipe body 39, the inner end of the slide rod 43 being butted against a tension spring connected with the inner wall of the short-range hole. The auxiliary assembly further comprises a pressure component located below the lower arm 3 and connected with the slide rods 43 on the two staggered frames. The winding wheel 42 has a pull line wound thereon, and a torsion spring is connected with the short shaft of the winding wheel 42 and the inclined extending rod 40. The pull line is turned upward after passing through the pressure component and is finally connected with the lower end of the cross arm 37. Thus, during downward movement of the pressure component, the pull line can be subjected to a force applied by the pressure component, thereby causing the winding wheel 42 to start rotating and driving the auxiliary bracket to flip. After the movable contact assembly is installed, the downward traction on the pressure component is released, at which time the pressure component is reset under the restoring force of the tension spring, and the auxiliary bracket is reset under the action of the torsion spring.

[0038] The pressure component comprises a hanger 44 and a pulley 45. The hanger 44 is U-shaped and has an upper opening, and the pulley 45 is located in the upper opening and has a longitudinal gap with the bottom of the hanger 44. The hanger 44 and the pulley 45 are connected through a center shaft, the pull line passes below the pulley 45, and a pull ring 46 is connected to the hanger 44, which can apply a downward traction force to the hanger 44, thereby causing the pulley 45 to move downward and applying a force to the pull line.

[0039] Embodiment three, refer to Figure 8As shown, the inner positioning arm 38 is adjusted and optimized, an axial through channel is arranged on the inner positioning arm 38, and a lifting component is connected through the axial through channel. In this embodiment, the pull wire can be connected with the lower end of the lifting component after being wound around the pulley 45, so that a separate connection position does not need to be arranged on the cross brace arm 37. The axial through channel in this embodiment includes three parts, namely an upper output channel, a middle direction-changing channel 47, and a lower displacement channel 48. The main view cross section of the lower displacement channel 48 is a right-angled trapezoid, that is, a slope is arranged in the lower displacement channel 48. A longitudinal suspension rod 49 is arranged in the lower displacement channel 48. The upper end of the longitudinal suspension rod 49 is connected with a tilting rod 50 through a sliding sleeve. The tilting rod 50 is located in the middle direction-changing channel 47 and is connected with the inner wall of the middle direction-changing channel 47 through a shaft. The tilting rod 50 is connected with a top rod 51 through a sliding sleeve. The top rod 51 is located in the upper output channel. The longitudinal suspension rod 49 is hinged with the sliding sleeve, and the top rod 51 is also hinged with the sliding sleeve on the corresponding side. A lifting ring is fixed at the lower end of the longitudinal suspension rod 49. A guide block 52 is arranged at the bottom of the inner positioning arm 38. The guide block 52 has a slope, which is a guide surface. An extension straight hole is arranged on the guide block 52. The pull wire can be connected with the longitudinal suspension rod 49 after passing through the extension straight hole. When the lifting ring is pulled, the longitudinal suspension rod 49 moves downward and moves along the inclination direction of the guide surface. At this time, the longitudinal suspension rod 49 moves away from the moving contact assembly. At this time, the top rod 51 moves upward, an upward force is exerted on the longitudinal pressure contact strip plate 4 through the top rod 51, the longitudinal pressure contact strip plate 4 is tilted upward, and thus the moving contact assembly can be removed under the condition that the fuse is not melted.

[0040] Finally, referring to Figure 9 As shown, the auxiliary bracket in this technical solution includes two short arm rods 53. Each short arm rod 53 is connected with the corresponding wire reel 42. A supporting rod 54 is connected between the two short arm rods 53. A supporting groove 55 is arranged at the middle position of the supporting rod 54. During the upward overturning process of the auxiliary bracket, the fuse tube 14 can be located in the supporting groove 55.

[0041] Normal working state: the fuse passes through the fuse tube 14. At this time, the fuse is in a tension state, and the circuit is turned on.

[0042] Fault occurs: when the line is overloaded or short-circuit current occurs, the fuse is melted due to overheating.

[0043] After the fuse is melted, the tension disappears. At this time, the moving contact assembly overturns downward to form an obvious and air-insulated disconnection point, which plays an isolation role.

[0044] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A drop-out fuse, characterized in that, include: The upper contact head is used to connect the input terminal of the wire; The lower contact head is used to connect the output end of the wire; The moving contact assembly, hinged to the lower moving head, is used to connect the fuse; The auxiliary assembly component can apply force to the moving contact assembly, causing the moving contact assembly to flip upward and couple the upper end of the moving contact assembly with the upper moving head; The auxiliary assembly components include: The auxiliary bracket can be flipped upward and is provided with a slot (55); During the upward flipping of the auxiliary bracket, the moving contact assembly is coupled to the slot (55).

2. The drop-out fuse according to claim 1, characterized in that, The upper actuating head includes a longitudinal pressure contact plate (4) and a reset member (8) connected thereto. The reset member (8) applies a downward force to the longitudinal pressure contact plate (4).

3. The drop-out fuse according to claim 2, characterized in that, The lower actuator includes: The steel bracket (12) can be detachably connected to the moving contact assembly; The horizontal contact plate (10) is located above the steel bracket (12), and when the upper end of the moving contact assembly is coupled with the upper moving head, the horizontal contact plate (10) is in close contact with the lower end of the moving contact assembly.

4. The drop-out fuse according to claim 3, characterized in that, The moving contact assembly includes: A fuse tube (14) is used to pass through the fuse and to extinguish the arc of a blown fuse; The top positioning element is hinged to the upper end of the fuse tube (14) and can be connected to the upper end of the fuse. The bottom positioning bracket is installed at the lower end of the fuse tube (14) and is detachably connected to the steel bracket (12). It can dock with the lower end of the fuse and abut against the horizontal contact plate (10).

5. The drop-out fuse according to claim 4, characterized in that, The steel bracket (12) is provided with a connecting notch (13), and a rotating pin (16) is fitted inside the connecting notch (13). The rotating pin (16) is fixed on the bottom positioning frame and can be moved out from the connecting notch.

6. The drop-out fuse according to claim 5, characterized in that, The bottom positioning frame includes a front seat (18), which can be connected to the lower end of the fuse tube (14). A wire clamping assembly is provided on the front seat (18) to apply a downward force to the fuse.

7. The drop-out fuse according to claim 6, characterized in that, The wire clamping assembly includes: Fuse clamp (20) is located above the fuse; The control lever (22) is connected to the front seat (18) and can move vertically when screwed; When the control rod (22) moves downward, it can apply a downward force to the fuse block (20).

8. The drop-out fuse according to claim 7, characterized in that, The wire clamping assembly also includes: The guide rod (24) is mated to the fuse clamp (20) and can be movably connected to the control rod (22); A compression return spring (25) is sleeved on the guide rod (24) and located between the control rod (22) and the fuse block (20); When the control lever (22) moves vertically, it can compress the compression return spring (25).

9. The drop-out fuse according to claim 8, characterized in that, The control rod (22) is provided with a guide channel, and the guide rod (24) can be inserted into the guide channel.

10. The drop-out fuse according to claim 1, characterized in that, The auxiliary assembly components also include: Inner positioning arm (38); The crossover frame is docked at the lower end of the inner positioning arm (38) and is hinged to the auxiliary bracket.

11. The drop-out fuse according to claim 10, characterized in that, The crossing frame includes two staggered frames, which are symmetrically arranged. Each staggered frame is connected to a winding wheel (42). The winding wheel (42) can rotate and docks with the end of the auxiliary bracket. A pull line is wound on the winding wheel (42).

12. The drop-out fuse according to claim 11, characterized in that, The misalignment frame includes: Extend the straight tube and connect it to the lower end of the inner positioning arm (38); An inclined extension rod (40) is fixed at its upper end to an extension straight tube (39) and at its lower end to a winding wheel (42).

13. The drop-out fuse according to claim 11, characterized in that, The misalignment frame is connected to a pressure component, and the pull wire can pass through the pressure component. The pressure component can apply a downward force to the pull wire, causing the winding wheel (42) to rotate.

14. The drop-out fuse according to claim 13, characterized in that, The pressure component includes: Hanger (44) has an upper opening; The pulley (45) is located in the upper opening of the hanger (44) and is connected to the hanger (44) via the central shaft; The pull line is located below the pulley (45).

15. The drop-out fuse according to any one of claims 1-14, characterized in that, The auxiliary bracket includes: The short arm (53) is connected to the winding reel (42); The support rod (54) is fixed to the short arm rod (53); The slot (55) is located in the middle of the rod (54); when the winding wheel (42) rotates, it can apply force to the moving contact assembly through the rod (54).

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