An auxiliary device for replacing three-phase synchronous drop-out fuses under load

Abstract

This invention discloses an auxiliary device for replacing three-phase synchronous drop-out fuses under load, including an operating rod. The top of the operating rod has a central support and two side supports located on either side of the central support. The side supports are telescopic and detachably connected to the top of the central support via positioning collars. A connecting belt is movably connected inside the central support. In this invention, the operating rod, the central support at its top, and the two side supports are all connected to an external insulating connecting rod via positioning collars. After the external insulating connecting rod, the lower stationary contact assembly, the lower moving contact assembly, the opening / closing bracket, and the opening / closing handle are installed, the operating rod is moved up and down to cause the insulating connecting rod to swing up and down. This design ensures that the insulating connecting rod is subjected to uniform force, and the up-and-down swing of the insulating connecting rod can eliminate some of the rotational stress caused by component deformation, thereby making the rotation of each opening / closing bracket smoother.

Description

Technical Field

[0001] This invention relates to the field of fuse switch installation technology, and in particular to an auxiliary device for replacing three-phase synchronous drop-out fuses under load. Background Technology

[0002] Fuses are essential protective devices for high-voltage transmission lines. When a short circuit or overload occurs, they can promptly disconnect the faulty line, preventing damage to the line and electrical equipment. Currently, all fuses used in outdoor transformers in China are unidirectional. They require an insulating link to hang the upper contact ring, and while the line is swaying, the lower contact tabs are then hooked into the lower support. This three-phase operation is difficult, time-consuming, labor-intensive, and unsafe. Using high-tech, high-cost methods or equipment is impractical for the large-scale and widespread use of outdoor transformer fuses.

[0003] To address this, invention patent CN109950109B proposes a 10kV three-phase synchronous drop-out fuse switch, comprising three sets of fuse mechanisms and an insulating connecting rod connecting the three sets of fuse mechanisms. Each fuse mechanism includes a porcelain insulator, mounting components, inlet terminals, outlet terminals, upper stationary contact assembly, lower stationary contact assembly, upper moving contact assembly, lower moving contact assembly, fuse tube, fuse, opening / closing bracket, opening / closing handle, and arc extinguishing tube. Its key feature is that by rotating the fixing foot of the lower moving contact assembly's housing to a horizontal or vertical position, it drives the lower moving contact assembly, fuse tube, and upper moving contact assembly, which are integrated with it, to move upward or downward together. This achieves the pressing or disconnection of the upper moving contact assembly with the upper stationary contact assembly, and, under the linkage of the insulating connecting rod, realizes the closing or opening operation of the fuse mechanism. The advantages of this invention are: simple structure, convenient operation, more stable contact between the upper and lower moving and stationary contacts, and effective avoidance of arc short circuit problems.

[0004] The aforementioned existing technology has shortcomings in its use: In the existing technology, the insulating connecting rod, lower stationary contact assembly, lower moving contact assembly, opening and closing bracket, and opening and closing handle are connected by assembly. The downward swing of the opening and closing handle can drive the fuse tube to separate from the stationary contact, thereby achieving the purpose of synchronous three-phase disconnection. However, there are three sets of lower stationary contact assemblies, lower moving contact assemblies, opening and closing brackets, and opening and closing handles corresponding to the three phases. Moreover, the lower stationary contact assembly, lower moving contact assembly, opening and closing bracket, and opening and closing handle are connected by a pin-type structure, and the three opening and closing handles are bridged by an insulating connecting rod. Due to the large number of rotating structures, the participating components are prone to deformation. Therefore, there is a problem that all or part of the three opening and closing brackets may become stuck during rotation. This sticking can easily lead to the three phases not being able to disconnect synchronously, thus failing to provide phase loss protection.

[0005] Therefore, the present invention proposes an auxiliary device for replacing three-phase synchronous drop-out fuses under load. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary device for replacing three-phase synchronous drop-out fuses under load, in order to solve the problems existing in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An auxiliary device for replacing a three-phase synchronous drop-out fuse under load includes an operating lever. The top of the operating lever is provided with a central support and two side supports located on both sides of the central support. The side supports are telescopic and are detachably connected to the top of the central support with positioning collars. A connecting belt is movably connected inside the central support. The two sides of the connecting belt are movably connected to the adjacent side supports through a transmission mechanism. Under the transmission of the transmission mechanism, the two side supports are in opposite telescopic states when the connecting belt is running. The central support is provided with a flexible adjustment mechanism that works in conjunction with the connecting belt. The flexible adjustment mechanism has the function of locking the transmission mechanism.

[0009] As a further description of the above technical solution:

[0010] The central support is provided with two tensioning pulleys distributed vertically for tensioning the connecting belt. The connecting belt is fixedly connected to the two sides of the tensioning pulleys with sliding seats that slide in cooperation with the central support. The sliding seats are connected to the adjacent transmission mechanism.

[0011] As a further description of the above technical solution:

[0012] The transmission mechanism includes an arm and a connecting rod. The top of the operating rod is fixedly provided with a seat plate located on both sides of the central support. The arm has a telescopic function and one end is hinged to the slide seat, and the other end is hinged to one side of the seat plate. One end of the connecting rod is hinged to one side of the arm and the other end is hinged to the moving part on the side support.

[0013] As a further description of the above technical solution:

[0014] The flexible adjustment mechanism includes a pressure plate, elastic telescopic struts, and a manual adjustment group. The pressure plate and the middle support are slidably connected and located inside the connecting belt. There are two pressure plates, which are located on the upper and lower sides of the slide block, respectively. Elastic telescopic struts are provided on the opposite sides of the two pressure plates. One end of the elastic telescopic strut is hinged to the middle support near the end, and the other end abuts against the pressure plate. The manual adjustment group is located in the middle of the middle support and is used to control the synchronous swing of the elastic telescopic struts on both sides of the two pressure plates.

[0015] As a further description of the above technical solution:

[0016] The central support has a waist-shaped hole in the middle, and a column is fixedly connected in the waist-shaped hole. The manual adjustment group includes a lead screw and a connecting rod. The lead screw passes through the middle of the column and has a rotatable adapter rod at one end. The two ends of the adapter rod are respectively hinged to one side of the non-telescopic part of the adjacent elastic telescopic support rod through the connecting rod.

[0017] As a further description of the above technical solution:

[0018] A roller is provided at the end of the elastic telescopic support that abuts against the pressure plate.

[0019] As a further description of the above technical solution:

[0020] The outer peripheral wall of the positioning collar is rotatably connected to the mounting base, and the rotation axes of both are perpendicular to the axis of the positioning collar. The top of the side support and the middle support are both provided with a plug-in locking connection structure, which is connected to the mounting base.

[0021] As a further description of the above technical solution:

[0022] The plug-in locking connection structure includes a positioning block and a locking bolt. The top of the positioning block has a plug hole that is compatible with the mounting base. The locking bolt is screwed into one side of the positioning block and one end of the bolt is opposite to the mounting base.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. In this invention, an operating rod and a central support and two side supports are provided at the top of the operating rod. The tops of the central support and the side supports are connected to the external insulating connecting rod through positioning collars. After the external insulating connecting rod, the lower stationary contact assembly, the lower moving contact assembly, the opening and closing bracket, and the opening and closing handle are installed, the operating rod is moved up and down by hand to drive the insulating connecting rod to swing up and down. This arrangement makes the insulating connecting rod evenly stressed. When the insulating connecting rod swings up and down, it can eliminate some of the rotational stress caused by component deformation, thereby making the rotation of each opening and closing bracket smoother.

[0025] 2. In this invention, by setting a flexible adjustment mechanism, a connecting belt and a transmission mechanism, and then setting the side support to a telescopic structure, if some or all of the opening and closing brackets become stuck in rotation, when the operating rod is pulled down, the connecting belt and transmission mechanism cause all the positioning collars to move asynchronously. That is to say, the insulating connecting rod is tilted or bent. At this time, the stuck opening and closing brackets can be found by observing the state of the connecting belt, which helps to accurately correct and improve the efficiency of the correction process.

[0026] 3. In this invention, the positioning collar is a detachable connection structure. After the correction is completed, the device can be separated from the external insulating connecting rod. At this time, the positioning collar will remain on the insulating connecting rod. When performing rotational maintenance on the opening and closing bracket later, the device can be quickly connected and then used for rapid correction. This has the advantage of greater convenience in later maintenance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an auxiliary device for replacing a three-phase synchronous drop-out fuse under load, as proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the main structure of an auxiliary device for replacing a three-phase synchronous drop-out fuse under load, as proposed in this invention.

[0029] Figure 3 for Figure 1 A magnified diagram of the central "a";

[0030] Figure 4 for Figure 1 A magnified diagram of the central "b";

[0031] Figure 5 This is a schematic diagram of the back of an auxiliary device for replacing a three-phase synchronous drop-out fuse under load, as proposed in this invention.

[0032] Legend:

[0033] 1. Operating lever; 12. Seat plate; 2. Central support; 22. Waist-shaped hole; 221. Column; 3. Side support; 4. Positioning collar; 41. Mounting seat; 5. Connecting belt; 6. Transmission mechanism; 61. Arm; 62. Connecting rod; 7. Flexible adjustment mechanism; 71. Pressure plate; 72. Elastic telescopic support rod; 721. Roller; 73. Manual adjustment group; 731. Screw; 7311. Adapter rod; 732. Connecting rod; 8. Tensioning wheel; 9. Slide seat; 101. Plug-in locking connection structure; 1011. Positioning block; 10111. Insertion hole; 1012. Locking bolt. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please see Figure 1-5An auxiliary device for replacing three-phase synchronous drop-out fuses under load includes an operating lever 1, which is a handheld lever. The top of the operating lever 1 is equipped with a central support 2 and two side supports 3 located on either side of the central support 2. The two side supports 3 are symmetrical to the central support 2 and the three are parallel. Positioning collars 4 are detachably connected to the tops of the side supports 3 and the central support 2. In use, the positioning collars 4 are fitted onto the external insulating connecting rod, so that each positioning collar 4 is located on one side of each opening / closing handle. The positioning collars 4 and the insulating connecting rod are in a rotating tight fit, and this rotation is frictional. Therefore, after the insulating connecting rod, lower stationary contact assembly, lower moving contact assembly, opening / closing bracket, and opening / closing handle are assembled, manually holding the operating lever 1 and pulling it up and down causes the insulating connecting rod to be evenly stressed, simultaneously driving the three corresponding opening / closing brackets to rotate. This eliminates the rotational resistance of the opening / closing brackets, thereby eliminating the rotational stress between the lower stationary contact assembly, the lower moving contact assembly, and the opening / closing brackets, making the rotation of each opening / closing bracket smoother. This is a hard break-in adjustment.

[0037] Furthermore, the side support 3 is telescopic, meaning it extends vertically. A connecting belt 5 is movably connected inside the central support 2. Both sides of the connecting belt 5 are movably connected to the adjacent side support 3 via a transmission mechanism 6. Preferably, the central support 2 has two tensioning wheels 8 arranged vertically for tensioning the connecting belt 5. The connecting belt 5 has slide seats 9 fixedly connected to both sides of the tensioning wheels 8, which slide in a sliding fit with the central support 2. In practice, a connecting shaft fixedly connected to the side of the connecting belt 5 can be welded to one side of the slide seat 9. Then, a sliding groove that slides in a sliding fit with the slide seat 9 is opened on the central support 2. The slide seat 9 is a through-groove and is connected to the adjacent transmission mechanism 6. Under the transmission mechanism 6, when the connecting belt 5 rotates, the two side supports 3 are in opposite directions of extension and retraction. This means that when one side support 3 extends, the other side support 3 retracts. The connecting belt 5 provides flexible transmission; that is, the connecting belt 5 uses its rotation to control the extension and retraction of the side supports 3 through the transmission mechanism 6. It should be noted that because the connecting belt 5 has elastic deformation properties, the extension and retraction of the two side supports 3 are different. When the side supports 3 are in the extendable state, pulling the operating lever 1 up and down can indicate that one or two of the closing / opening brackets are stuck. In other words, when a partial closing / opening bracket is stuck in rotation, the insulating connecting rod will tilt. This tilt indicates the stuck closing / opening bracket. The operator can then use tools to correct the closing / opening bracket (e.g., by tapping the deformed area). After correction, the operating lever 1 can be operated again to verify. This is a flexible verification and adjustment.

[0038] The transmission mechanism 6 includes an arm 61 and a connecting rod 62. The top of the operating lever 1 is fixedly equipped with seat plates 12 located on both sides of the central support 2. The side support 3 is a two-section telescopic structure and its bottom is fixedly connected to the upper end face of the seat plate 12. The arm 61 has a telescopic function and one end is hinged to the slide 9, and the other end is hinged to one side of the seat plate 12. In specific implementation, one end of the arm 61 can be rotatably connected to the connecting shaft mentioned above. The arm 61 also adopts a two-section telescopic rod structure. One end of the connecting rod 62 is hinged to one side of the arm 61 and the other end is hinged to the moving part on the side support 3. Thus, when the slide 9 is driven to move up and down, the arm 61 will swing up and down. Under the drive of the connecting rod 62, the side support 3 will telescopically move. It should be noted that when the slides 9 on the connecting belt 5 are at the same height, all the positioning collars 4 are at the same height.

[0039] The middle support 2 is equipped with a flexible adjustment mechanism 7 that works in conjunction with the connecting belt 5. The flexible adjustment mechanism 7 has the function of locking the transmission mechanism 6, that is, the flexible adjustment mechanism 7 has the function of switching between hard break-in adjustment and flexible verification adjustment.

[0040] Specifically, the flexible adjustment mechanism 7 includes a pressure plate 71, an elastic telescopic support rod 72, and a manual adjustment group 73. The pressure plate 71 and the central support 2 are slidably connected and located inside the connecting belt 5. There are two pressure plates 71, which are located on the upper and lower sides of the slide 9 respectively. When the pressure plate 71 moves downward, it can squeeze the slide 9 below it. When the two pressure plates 71 move in opposite directions, they can squeeze the slide 9 between them to the same height and in a fixed state. At this time, the device is in the hard break-in adjustment position. Both pressure plates 71 are provided with elastic telescopic support rods 72 on their opposite sides. One end of each elastic telescopic support rod 72 is hinged to the middle support 2 near the end, and the other end abuts against the pressure plate 71. The elastic telescopic support rod 72 adopts a two-section telescopic rod structure with built-in support springs. The elastic telescopic support rod 72 makes the two pressure plates 71 tend to move in opposite directions. The manual adjustment group 73 is located in the middle of the middle support 2 and is used to control the synchronous swing of the elastic telescopic support rods 72 on both sides of the two pressure plates 71. When the two elastic telescopic support rods 72 are in the extreme compression state, the device is in the hard break-in adjustment position. When the two elastic telescopic support rods 72 are in the non-elastic compression state, the two pressure plates 71 will push the elastic telescopic support rods 72 to compress when they move in opposite directions. This state is the flexible verification adjustment position. That is to say, the manual adjustment group 73 has the function of switching between flexible and hard.

[0041] Among them, a roller 721 is provided on the end of the elastic telescopic support rod 72 that abuts against the pressure plate 71. This arrangement can reduce the frictional resistance between the elastic telescopic support rod 72 and the pressure plate 71.

[0042] In this embodiment, a waist-shaped hole 22 is provided in the middle of the central support 2. A column 221 is fixedly connected in the waist-shaped hole 22. The manual adjustment group 73 includes a lead screw 731 and a connecting rod 732. The lead screw 731 is provided through the middle of the column 221 and one end of it is rotatably connected to a transition rod 7311. That is, a threaded sleeve is fixedly provided on the column 221 and sleeved on the transition rod 7311. The two ends of the transition rod 7311 are respectively hinged to one side of the non-telescopic part of the adjacent elastic telescopic support rod 72 through the connecting rod 732. When the lead screw 731 is rotated, the transition rod 7311 will push the two elastic telescopic support rods 72 to swing synchronously through the connecting rod 732.

[0043] In this embodiment, the outer peripheral wall of the positioning collar 4 is rotatably connected to the mounting base 41, and the rotation axes of both are perpendicular to the axis of the positioning collar 4. This arrangement allows the positioning collar 4 to swing adaptively when the insulating connecting rod bends or tilts, without increasing the detection resistance. The tops of the side support 3 and the middle support 2 are both provided with a plug-in locking connection structure 101, which is connected to the mounting base 41. After use, the positioning collar 4 can be quickly separated from the device by operating the plug-in locking connection structure 101, leaving the positioning collar 4 on the insulating connecting rod for easy docking with the device during subsequent maintenance.

[0044] Specifically, the plug-in locking connection structure 101 includes a positioning block 1011 and a locking bolt 1012. The top of the positioning block 1011 has a plug hole 10111 that is plugged into the mounting base 41. The plug hole 10111 can be a square hole structure. The locking bolt 1012 and one side of the positioning block 1011 are screwed together and one end of the locking bolt is opposite to the mounting base 41. When the locking bolt 1012 is tightened, the mounting base 41 is fixed in the plug hole 10111. Otherwise, the mounting base 41 can be pulled out.

[0045] Working principle: Before assembling the insulating connecting rod, first connect the positioning collar 4 and the insulating connecting rod. After the fuse mechanism with phase loss protection is installed, fasten the device to the positioning collar 4 through the plug-in locking connection structure 101. Then start the operation until the lead screw 731 rotates to the hard running-in adjustment position. At this time, pull the operating lever 1 up and down to drive the opening and closing bracket to run and eliminate jamming resistance. Then control the lead screw 731 to rotate in the opposite direction until the device is in the flexible verification adjustment position. At this time, pull the operating lever 1 up and down again to sense the tilt change of the insulating rod. Then, combined with the movement state of the slide 9 between the two pressure plates 71, the position of the opening and closing bracket that is jammed can be determined. At this time, the opening and closing bracket can be fixedly corrected, and then the flexible verification can be performed. When all the slides 9 are at approximately the same height, all the opening and closing brackets are in a state of rotation without jamming, thus ensuring the reliability of the phase loss fuse protection.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An auxiliary device for live replacement of a three-phase synchronous drop-out fuse, characterized in that The utility model provides an operating rod (1), the top of operating rod (1) is provided with middle support (2) and two side supports (3) on both sides of middle support (2), side support (3) is telescopic and the top of middle support (2) is detachably connected with positioning sleeve ring (4), the movable connection of connecting belt (5) is arranged in middle support (2), the both sides of connecting belt (5) are movably connected with adjacent side support (3) through transmission mechanism (6) respectively, under the transmission of transmission mechanism (6), when connecting belt (5) operates, two side supports (3) are in different telescopic state, flexible adjusting mechanism (7) that is used with connecting belt (5) is arranged on middle support (2), flexible adjusting mechanism (7) has the function of locking transmission mechanism (6), two tension pulleys (8) that are used for tensioning connecting belt (5) and are distributed up and down are arranged in middle support (2), the both sides of connecting belt (5) are fixedly connected with sliding seat (9) that is slidably connected with middle support (2), sliding seat (9) is connected with adjacent transmission mechanism (6), transmission mechanism (6) includes arm lever (61) and connecting rod (62), the top of operating rod (1) is fixedly provided with seat plate (12) on both sides of middle support (2), arm lever (61) has telescopic function and is hingedly connected with one end of sliding seat (9), is hingedly connected with one side of seat plate (12) on the other end, one end of connecting rod (62) is hingedly connected with one side of arm lever (61) and the other end is hingedly connected with the action part on side support (3), flexible adjusting mechanism (7) includes pressing plate (71), elastic telescopic support rod (72) and manual adjusting group (73), pressing plate (71) is slidably connected with middle support (2) and is located in connecting belt (5), the number of pressing plate (71) is two and is located on the upper and lower sides of sliding seat (9) respectively, the side away from of two pressing plate (71) is provided with elastic telescopic support rod (72), one end of elastic telescopic support rod (72) is hingedly connected with the position close to the end of middle support (2) and the other end is abutted with pressing plate (71), manual adjusting group (73) is arranged in the middle of middle support (2) and is used for controlling the synchronous swing of the elastic telescopic support rod (72) on both sides of two pressing plate (71).

2. An auxiliary device for replacing a three-phase synchronous drop-out fuse under load according to claim 1, characterized in that The middle part of middle support (2) is provided with a waist-shaped hole (22), a stand (221) is fixedly connected in the waist-shaped hole (22), the manual adjusting group (73) includes a lead screw (731) and a link rod (732), the lead screw (731) is arranged through the middle part of the stand (221), and one end of the lead screw (731) is rotatably connected with an adapter rod (7311), the two ends of the adapter rod (7311) are hingedly connected with the non-telescopic part of the adjacent elastic telescopic support rod (72) through the link rod (732) respectively.

3. An auxiliary device for replacing a three-phase synchronous drop-out fuse under load according to claim 1, characterized in that, One end of the elastic telescopic support rod (72) abutting against the pressing plate (71) is provided with a roller (721).

4. An auxiliary device for replacing a three-phase synchronous drop-out fuse under load according to claim 1, characterized in that, The outer peripheral wall of the positioning collar (4) is rotationally connected with a mounting seat (41), and the rotation axes of the two and the axis of the positioning collar (4) are perpendicular, the top of the side support (3) and the middle support (2) are provided with an insertion locking engaging structure (101), which is connected with the mounting seat (41).

5. An auxiliary device for load changeover of a three-phase synchronous drop-out fuse according to claim 4, characterized in that The insertion locking engaging structure (101) comprises a positioning block (1011) and a locking bolt (1012), the top of the positioning block (1011) is provided with an insertion hole (10111) which is insertedly matched with the mounting seat (41), the locking bolt (1012) is rotationally connected with one side of the positioning block (1011) and one end thereof is opposite to the mounting seat (41).

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