Auxiliary device for on-load replacement of three-phase synchronous drop-out fuse

Abstract

The invention discloses an auxiliary device for on-load replacement of a three-phase synchronous drop-out fuse, which comprises an operating rod, the top of the operating rod is provided with a middle support and two side supports located at the two sides of the middle support, the side supports are telescopic, the top of each side support and the top of the middle support are detachably connected with a positioning lantern ring, and the middle support is internally and movably connected with a connecting belt. According to the invention, the operating rod, the middle support and the two side supports are arranged, the middle support and the two side supports are located at the top of the operating rod, and the tops of the middle support and the side supports are sleeved with the external insulating connecting rod through the positioning lantern rings. The handheld operating rod moves back and forth up and down to drive the insulating connecting rod to swing up and down, so that the insulating connecting rod is stressed uniformly, part of rotation stress caused by deformation of components can be eliminated when the insulating connecting rod swings up and down, and rotation of each opening and closing support can be smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of fuse switch installation, in particular to an auxiliary device for load replacement of a three-phase synchronous drop-out fuse. Background Art

[0002] Fuse switches are essential protective devices for high-voltage transmission lines. When a short circuit or overload occurs, they promptly disconnect the faulty line, preventing damage to the line and electrical equipment. Existing fuses for outdoor transformers in China are all one-way operated. An insulated shackle rod is used to hang the upper contact ring, which is then swung into the lower support. This requires operating each of the three phases separately, making it difficult, time-consuming, labor-intensive, and unsafe. Using high-tech, high-cost technology or equipment is impractical for the large-scale and widespread use of outdoor transformers.

[0003] To this end, the invention patent with publication number CN109950109B proposes a 10kV three-phase synchronous drop-out fuse switch, which includes three sets of fuse mechanisms and an insulating connecting rod connecting the three sets of fuse mechanisms. Each set of fuse mechanisms includes a porcelain bottle, a mounting assembly, an input terminal, an output terminal, an upper static contact assembly, a lower static contact assembly, an upper moving contact assembly, a lower moving contact assembly, a fuse tube, a fuse, a switch opening and closing bracket, a switch opening and closing handle, and an arc extinguishing tube. The invention is characterized in that the lower moving contact assembly, the fuse tube, and the upper moving contact assembly connected thereto are driven upward or downward by rotating the fixing foot of the plug-in box of the lower moving contact assembly to a horizontal or vertical state, thereby achieving a tight fit or disconnection between the upper moving contact assembly and the upper static contact assembly, and realizing the closing or opening operation of the fuse mechanism under the linkage of the insulating connecting rod. The advantages of the invention include: simple structure, convenient operation, more stable contact between the upper and lower moving and static contacts, and effective avoidance of arc short circuit problems.

[0004] The above-mentioned prior art still has deficiencies when used: in the above-mentioned prior art, the insulating connecting rod, the lower static contact assembly, the lower moving contact assembly, the opening and closing bracket and the opening and closing handle are connected in an assembled manner, and the swinging of the opening and closing handle can drive the fuse tube and the static contact to separate, thereby achieving the purpose of three-phase synchronous disconnection. However, the three phases correspond to three groups of lower static contact assemblies, lower moving contact assemblies, opening and closing brackets and opening and closing handles, and the lower static contact assembly, lower moving contact assembly, opening and closing brackets and opening and closing handles are connected by a pin-like structure, and the three opening and closing handles are bridged by an insulating connecting rod. Due to the large number of rotating structures, there is a problem of deformation of the participating components, so there is a problem of rotation jamming of all or part of the three opening and closing brackets. The jamming can easily lead to the problem that the three phases cannot be disconnected synchronously, and it is difficult to play the role of phase loss protection.

[0005] To this end, 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 the present invention is to solve the problems existing in the background technology and to propose an auxiliary device for replacing a three-phase synchronous drop-out fuse under load.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An auxiliary device for load replacement of three-phase synchronous drop-out fuses includes an operating rod, a center support and two side supports located on both sides of the center support are provided on the top of the operating rod, the side supports are telescopic and are detachably connected to the top of the center support with positioning rings, a connecting belt is movably connected inside the center support, and the two sides of the connecting belt are movably connected to adjacent side supports through a transmission mechanism. Under the transmission of the transmission mechanism, the two side supports are in telescopic states in different directions when the connecting belt is running, and a flexible adjustment mechanism is provided on the center support for use with the connecting belt, and the flexible adjustment mechanism has the function of locking the transmission mechanism.

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

[0010] Two tensioning wheels distributed up and down and used for tensioning the connecting belt are provided in the middle support. On both sides of the tensioning wheel on the connecting belt, there are fixedly connected slides that slide with the middle support. The slides 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 fixed with a seat plate located on both sides of the middle support. The arm has a telescopic function and one end of it is hingedly connected to the slide seat, and the other end is hingedly connected to one side of the seat plate. One end of the connecting rod is hingedly connected to one side of the arm and the other end is hingedly connected to the action part on the side support.

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

[0014] The flexible adjustment mechanism includes a pressure plate, an elastic telescopic support rod and a manual adjustment group. The pressure plate and the middle support are connected in an up and down sliding manner and are located in a connecting belt. There are two pressure plates and they are respectively located on the upper and lower sides of the slide. The two pressure plates are provided with elastic telescopic support rods on the opposite sides. One end of the elastic telescopic support rod is hingedly connected to a position near the end of the middle support and the other end is against the pressure plate. The manual adjustment group is arranged in the middle of the middle support and is used to control the synchronous swing of the elastic telescopic support rods on both sides of the two pressure plates.

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

[0016] A waist-shaped hole is opened in the middle of the middle support, and a column is fixedly connected in the waist-shaped hole. The manual adjustment group includes a screw rod and a connecting rod. The screw rod is set to pass through the middle of the column and one end of it is rotatably connected to the transfer rod. The two ends of the transfer rod are respectively hingedly connected through the connecting rod and one side of the non-telescopic part on the adjacent elastic telescopic support rod.

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

[0018] A roller is provided on one end of the elastic telescopic support rod that abuts against the pressing 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 seat, and the rotation axes of the two are perpendicular to the axis of the positioning collar. The tops of the side supports and the middle support are both provided with plug-in locking connection structures, which are connected to the mounting seat.

[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 is provided with a socket that is plugged into the mounting seat. The locking bolt is screwed through one side of the positioning block and one end thereof is opposite to the mounting seat.

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

[0024] 1. In the present invention, an operating rod and a middle support and two side supports located at the top of the operating rod are provided. The tops of the middle support and the side supports are connected to the external insulating connecting rod through positioning rings. After the external insulating connecting rod, the lower static contact assembly, the lower moving contact assembly, the opening and closing bracket and the opening and closing handle are installed, the handheld operating rod is moved up and down to drive the insulating connecting rod to swing up and down. This arrangement makes the insulating connecting rod evenly stressed, and when the insulating connecting rod swings up and down, it can eliminate part of the rotational stress caused by the deformation of the components, thereby making the rotation of each opening and closing bracket smoother.

[0025] 2. In the present invention, a flexible adjustment mechanism, a connecting belt and a transmission mechanism are provided, and then the side supports are provided as a telescopic structure. If part or all of the closing and opening brackets are stuck in rotation, when the operating lever is pulled downward, the connecting belt and the transmission mechanism cause all the positioning rings to move asynchronously, that is, the insulating connecting rod is tilted or bent. At this time, the stuck closing and opening bracket can be found through the operation status of the connecting belt, which is conducive to accurate correction and improves the efficiency of the correction process.

[0026] 3. In the present invention, the positioning collar is a detachable connection structure. After the correction is completed, the device and the external insulating connecting rod can be separated. At this time, the positioning collar will remain on the insulating connecting rod. When the rotation of the opening and closing bracket is maintained later, the device can be quickly connected, and then the device can be used for rapid correction processing, which has the advantage of higher convenience for later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of an auxiliary device for load replacement of three-phase synchronous drop-out fuses proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the front view of an auxiliary device for load replacement of three-phase synchronous drop-out fuses proposed by the present invention;

[0029] Figure 3 for Figure 1 Schematic diagram of the enlarged part "a" in the middle;

[0030] Figure 4 for Figure 1 The enlarged schematic diagram of the part “b” in the middle;

[0031] Figure 5 This is a structural schematic diagram of the back side of an auxiliary device for load replacement of three-phase synchronous drop-out fuses proposed by the present invention.

[0032] Legend:

[0033] 1. Operating lever; 12. Seat plate; 2. Middle support; 22. Waist-shaped hole; 221. Vertical 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 pulley; 9. Slide; 101. Plug-in locking connection structure; 1011. Positioning block; 10111. Socket; 1012. Locking bolt. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-5An auxiliary device for replacing a three-phase synchronous drop-out fuse under load includes an operating rod 1. The operating rod 1 is a hand-held rod. The top of the operating rod 1 is provided with a center support 2 and two side supports 3 located on both sides of the center support 2. The two side supports 3 are symmetrical with respect to the center support 2 and the three are parallel. Positioning collars 4 are detachably connected to the tops of the side supports 3 and the center support 2. When in use, the positioning collars 4 are sleeved on the external insulating connecting rods so that each positioning collar 4 is located on one side of each opening and closing handle, wherein the positioning collars 4 and the insulating connecting rods are in a state of tight rotation fit, and the rotation here is friction rotation. Therefore, after the insulating connecting rods, the lower static contact assembly, the lower moving contact assembly, the opening and closing brackets and the opening and closing handles are assembled, the operating rod 1 is manually grasped and pulled up and down. After the insulating connecting rods are evenly stressed, they will simultaneously drive the three corresponding opening and closing brackets to rotate, thereby eliminating the rotational resistance of the opening and closing brackets, and further eliminating the rotational stress between the lower static contact assembly, the lower moving contact assembly and the opening and closing brackets, making the rotation of each opening and closing bracket smoother. This is a hard break-in adjustment.

[0037] Furthermore, the side supports 3 are telescopic, and the telescopic at this time refers to up and down telescopic. A connecting belt 5 is movably connected in the middle support 2, and the two sides of the connecting belt 5 are movably connected to the adjacent side supports 3 through a transmission mechanism 6. In specific implementation, it is preferred that two tensioning pulleys 8 distributed up and down and used to tension the connecting belt 5 are provided in the middle support 2, and a slide 9 that slides with the middle support 2 is fixedly connected on both sides of the tensioning pulley 8 on the connecting belt 5. In specific implementation, a connecting shaft fixedly connected to the side of the connecting belt 5 can be welded on one side of the slide 9, and then a slide groove that slides with the slide 9 is opened on the middle support 2. The slide 9 is set to pass through the slide groove, and the slide 9 is connected to the adjacent transmission mechanism 6. Under the transmission of the transmission mechanism 6, when the connecting belt 5 is in operation, the two side supports 3 are in different directions of extension and contraction. Here, different directions means that when one side support 3 is extended, the other side support 3 is contracted. The function of the connecting belt 5 is flexible transmission, that is, the connecting belt 5 uses the operation to control the extension and contraction of the side supports 3 through the transmission mechanism 6. It should be noted that, because the connecting belt 5 has the property of elastic deformation, the two side supports 3 are extended and contracted differently at this time. When the side supports 3 are in the retractable state, when the handheld operating lever 1 is pulled up and down, it can be determined whether one or both of the opening and closing brackets are stuck. That is, when a local opening and closing bracket is stuck in rotation, the insulating connecting rod will tilt. The tilting state can be used to determine the stuck opening and closing bracket. The operator can then use tools to correct the opening and closing bracket (for example, knocking on the deformed part). After the correction is completed, re-operate the operating lever 1 to verify. This is the flexible verification adjustment.

[0038] Among them, the transmission mechanism 6 includes an arm 61 and a connecting rod 62. The top of the operating rod 1 is fixedly provided with a seat plate 12 located on both sides of the middle support 2. The side support 3 is a two-section telescopic structure and its bottom is fixedly connected to the upper end surface of the seat plate 12. The arm 61 has a telescopic function and one end is hingedly connected to the slide 9, and the other end is hingedly connected to one side of the seat plate 12. During specific implementation, one end of the arm 61 can be rotatably connected to the above-mentioned connecting shaft. The arm 61 also uses a two-section telescopic rod structure. One end of the connecting rod 62 is hingedly connected to one side of the arm 61 and the other end is hingedly connected to the action part on the side support 3. Therefore, when the slide 9 is driven up and down, the arm 61 will swing up and down, and the side support 3 will telescope under the drive of the connecting rod 62. It should be noted that when the slide 9 on the connecting belt 5 is at the same height, all the positioning rings 4 are at the same height.

[0039] The center support 2 is provided with a flexible adjustment mechanism 7 used 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 running-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 middle support 2 are connected in an up and down sliding manner and are located in the connecting belt 5. There are two pressure plates 71 and they are respectively located on the upper and lower sides of the slide 9. When the pressure plate 71 moves downward, it can squeeze the slide 9 below it. When the two pressure plates 71 move toward each other, 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 running-in adjustment gear. The two pressure plates 71 are each provided with an elastic telescopic support rod 72 on the away side. One end of the elastic telescopic support rod 72 is hingedly connected to a position near the end of the middle support 2 and the other end is against the pressure plate 71. The elastic telescopic support rod 72 adopts a telescopic rod structure with two sections of built-in support springs. The elastic telescopic support rod 72 makes the two pressure plates 71 have a tendency to move in opposite directions. The manual adjustment group 73 is arranged in the middle of the middle support 2 and is used to control the elastic telescopic support rods 72 on both sides of the two pressure plates 71 to swing synchronously. When the two elastic telescopic support rods 72 are in the extreme compression state, the device is in a hard running-in adjustment gear. 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 rod 72 to compress when they move in the opposite direction. This state is the gear for flexible verification adjustment, that is, the manual adjustment group 73 has the function of switching between flexibility and hardness.

[0041] A roller 721 is provided on one end of the elastic telescopic support rod 72 that contacts the pressing plate 71 . This arrangement can reduce the frictional resistance between the elastic telescopic support rod 72 and the pressing plate 71 .

[0042] In this embodiment, a waist-shaped hole 22 is opened in the middle of the middle support 2, and a column 221 is fixedly connected to the waist-shaped hole 22. The manual adjustment group 73 includes a screw rod 731 and a connecting rod 732. The screw rod 731 is set to pass through the middle of the column 221 and one end of it is rotatably connected to the transfer rod 7311. That is to say, a screw sleeve is fixedly set on the column 221 and is sleeved on the transfer rod 7311. The two ends of the transfer rod 7311 are respectively hingedly connected through the connecting rod 732 and one side of the non-telescopic part on the adjacent elastic telescopic support rod 72. When the control screw rod 731 is rotated, the transfer 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 wall of the positioning collar 4 is rotatably connected to a mounting seat 41, with the rotational axis of the two being perpendicular to the axis of the positioning collar 4. This arrangement allows the corresponding positioning collar 4 to adaptively swing when the insulating connecting rod bends or tilts, without increasing detection resistance. The tops of both the side supports 3 and the center support 2 are provided with a plug-in locking structure 101, which is connected to the mounting seat 41. After use, the positioning collar 4 can be quickly separated from the device by operating the plug-in locking structure 101, leaving the positioning collar 4 on the insulating connecting rod, facilitating quick docking with the device during subsequent inspection and 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 is provided with a socket 10111 that is plugged into the mounting seat 41. The socket 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 thereof is opposite to the mounting seat 41. When the locking bolt 1012 is tightened, the mounting seat 41 is fastened in the socket 10111, otherwise the mounting seat 41 can be pulled out.

[0045] Working principle: When in use, 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, the device is fastened to the positioning collar 4 by plugging in the locking connection structure 101, and then the operation is started until the screw rod 731 is rotated to the hard running-in adjustment gear. At this time, the hand-held operating lever 1 is pulled up and down to drive the opening and closing bracket to run and eliminate the blocking resistance. Then the screw rod 731 is controlled to rotate in the opposite direction until the device is in the flexible verification adjustment gear. At this time, the hand-held operating lever 1 is pulled 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 where movement is stuck can be determined. At this time, the opening and closing bracket can be corrected at a fixed point, and then 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 blocking, thereby ensuring the reliability of the phase loss fuse protection.

[0046] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An auxiliary device for replacing three-phase synchronous drop-out fuses under load, characterized in that: The utility model comprises an operating rod (1), wherein a middle support (2) and two side supports (3) located on both sides of the middle support (2) are provided at the top of the operating rod (1), the side supports (3) are telescopic and are detachably connected to the top of the middle support (2) with a positioning ring (4), a connecting belt (5) is movably connected inside the middle support (2), and the two sides of the connecting belt (5) are movably connected to the adjacent side supports (3) through a transmission mechanism (6), and under the transmission of the transmission mechanism (6), when the connecting belt (5) is in operation, the two side supports (3) are in different telescopic states, and a flexible adjustment mechanism (7) used in conjunction with the connecting belt (5) is provided on the middle support (2), and the flexible adjustment mechanism (7) has the function of locking the transmission mechanism (6).

2. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 1, characterized in that: Two tensioning wheels (8) distributed up and down and used for tensioning the connecting belt (5) are provided in the middle support (2). A slide (9) is fixedly connected to both sides of the tensioning wheel (8) on the connecting belt (5) and is slidably matched with the middle support (2). The slide (9) is connected to the adjacent transmission mechanism (6).

3. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 2, characterized in that: The transmission mechanism (6) includes an arm (61) and a connecting rod (62). The top of the operating rod (1) is fixedly provided with a seat plate (12) located on both sides of the middle support (2). The arm (61) has a telescopic function and one end thereof is hingedly connected to the slide seat (9), and the other end is hingedly connected to one side of the seat plate (12). One end of the connecting rod (62) is hingedly connected to one side of the arm (61) and the other end is hingedly connected to the action part on the side support (3).

4. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 2, characterized in that: 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 middle support (2) are connected in an upward and downward sliding manner and are located in the connecting belt (5). There are two pressure plates (71) and they are respectively located on the upper and lower sides of the slide (9). The two pressure plates (71) are provided with an elastic telescopic support rod (72) on the opposite sides. One end of the elastic telescopic support rod (72) is hingedly connected to a position near the end of the middle support (2) and the other end thereof is against the pressure plate (71). The manual adjustment group (73) is provided 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).

5. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 4, characterized in that: A waist-shaped hole (22) is provided in the middle of the middle support (2), and a column (221) is fixedly connected in the waist-shaped hole (22). The manual adjustment group (73) comprises a screw rod (731) and a connecting rod (732). The screw rod (731) is provided through the middle of the column (221) and one end of the screw rod is rotatably connected to a transfer rod (7311). The two ends of the transfer rod (7311) are respectively hingedly connected to one side of the non-telescopic portion on the adjacent elastic telescopic support rod (72) through the connecting rod (732).

6. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 4, characterized in that: A roller (721) is provided on one end of the elastic telescopic support rod (72) that abuts against the pressure plate (71).

7. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 1, characterized in that: The outer peripheral wall of the positioning collar (4) is rotatably connected to the mounting seat (41), and the rotation axes of the two are perpendicular to the axis of the positioning collar (4). The tops of the side supports (3) and the middle support (2) are both provided with a plug-in locking connection structure (101), and the plug-in locking connection structure (101) is connected to the mounting seat (41).

8. The auxiliary device for replacing three-phase synchronous drop-out fuses under load according to claim 7, characterized in that: The plug-in locking connection structure (101) comprises a positioning block (1011) and a locking bolt (1012); a top of the positioning block (1011) is provided with a socket (10111) that is plugged into the mounting seat (41); one side of the locking bolt (1012) is screwed through and connected to the positioning block (1011), and one end of the locking bolt is opposite to the mounting seat (41).

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