Electric operating mechanism of tap switch

Abstract

The utility model relates to the field of transformer tap switch accessories, and discloses a tap switch electric operating mechanism, which comprises a case, a gear box, an indicating device, a manual operating device, a motor and an output shaft, the case comprises a case body and a case cover, the motor is fixed in the case body, the output end of the motor is connected with the output shaft through the transmission mechanism, one end of the output shaft is fixedly connected with the input end of the gearbox, the other end of the output shaft extends out of the case and is in transmission connection with the tap switch, and the output end of the gearbox is connected with the indicating device; the gear box drives the indicating device through gear transmission, so that the indicating device displays the current working state, and the manual operation device is in transmission connection with the gear box. The electric operating mechanism for the tap switch disclosed by the utility model is relatively simple and reasonable in structure, compact in layout and capable of saving space. The problems that in the prior art, due to the fact that the structure is complex and parts are numerous, reliability is low, and faults are prone to occurring in the using process are solved.

Description

Technical Field

[0001] This utility model relates to the field of transformer tap changer accessories, and in particular to one type. Background Technology

[0002] Tap changers are typically used on transformers to adjust voltage ratios. The electric mechanism is the part that drives the tap changer, performing accurate tap position control and switching, and easily displaying the tap changer's current status. Because transformers have different requirements for the number of voltage regulation stages and control methods, the transmission and control system of the tap changer's electric mechanism is quite complex. The tap changer's electric mechanism mainly includes a motor, gearbox, control unit, position indicator, and protection devices.

[0003] Because the transmission and control system of the tap changer electric mechanism is complex, with various mechanical transmission, signal extraction, display, feedback and control systems being quite complex and numerous parts, its reliability is low and it is prone to failure during use. Utility Model Content

[0004] In view of this, the main objective of this utility model is to provide an electric operating mechanism for a tap changer, which can solve the problems in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] An electric operating mechanism for a tap changer includes: a housing, a gearbox, an indicator, a manual operating device, a motor, and an output shaft;

[0007] The chassis includes a chassis body and a chassis cover. The motor is fixed inside the chassis body. The output end of the motor is connected to an output shaft through a transmission mechanism. One end of the output shaft is fixedly connected to the input end of the gearbox. The other end of the output shaft extends out of the chassis and is driven by a tap switch. The output end of the gearbox is connected to an indicator device. The manual operation device is driven by the gearbox.

[0008] In a preferred embodiment, the gearbox includes: a housing, an input shaft, a first output shaft, and a second output shaft;

[0009] The housing is fixed inside the machine housing. The input shaft, the first output shaft, and the second output shaft are rotatably connected to the housing. The input shaft is connected to the motor via a belt. The first output shaft is connected to the input shaft via gear transmission with a transmission ratio of a first set value. One end of the first output shaft is connected to an indicator device.

[0010] The second output shaft is connected to the first output shaft via gear transmission, and the transmission ratio between the second output shaft and the first output shaft is a second set value.

[0011] In a preferred embodiment, the gearbox further includes: a third output shaft, a first driven shaft, and a second driven shaft;

[0012] The first driven shaft is connected to the input shaft via gear transmission, and the middle part of the first output shaft is connected to the first driven shaft via worm gear transmission. One end of the first output shaft is connected to an indicator device, and the other end is connected to a cam. A micro switch is provided on one side of the cam.

[0013] The second driven shaft is connected to the first output shaft via a worm gear drive. One end of the second output shaft is connected to the second driven shaft via a bevel gear drive. One end of the second output shaft is connected to an indicator device.

[0014] The third output shaft is connected to the second driven shaft via a worm gear transmission, and one end of the third output shaft is connected to an angle encoder.

[0015] In a preferred embodiment, the indicating device includes an indicator dial, a rotation pointer, a gear pointer, a large gear, and a large gear support device;

[0016] The indicator dial is fixed to the outside of the chassis, and the rotation pointer is fixedly connected to one end of the first output shaft;

[0017] The large gear support device is rotatably fixed inside the chassis. The large gear support device supports the large gear, which meshes with the gear on the second output shaft. The gear position pointer is fixed to one side of the large gear.

[0018] The large gear is coaxial with the first output shaft.

[0019] In a preferred embodiment, the large gear support device includes a pin and flange bearings. One end of the pin is fixedly connected to the housing, and two flange bearings are sleeved on the outside of the pin. The flanges of the two flange bearings are respectively located on the outside of the large gear, and multiple sets of flange bearings support the large gear.

[0020] In a preferred embodiment, the manual operating device includes: an operating shaft and a housing;

[0021] The housing is fixed inside the chassis, the operating shaft is rotatably connected to the housing, one end of the operating shaft has an interface, and the other end is provided with a bevel gear. The lower end of the input shaft is provided with a bevel gear, and the operating shaft and the input shaft are driven by gear meshing.

[0022] In a preferred embodiment, the manual operating device further includes: a cover plate, a tension spring, and a manual tool;

[0023] The cover plate is movably installed between the chassis and the housing. One end of the tension spring is fixedly connected to the cover plate, and the other end is fixedly connected to the housing. Pulling the cover plate towards the tension spring side will cover the interface.

[0024] A movable rod is provided on the surface of the cover plate, and a slot is opened in the chassis. The movable rod passes through the slot and extends out of the chassis.

[0025] The manual tool includes a handle, a middle rod, and a hand crank; the handle is rotatably fixed to one end of the middle rod, the hand crank is fixed to the other end of the middle rod, and a connector is provided at the other end of the hand crank.

[0026] In a preferred embodiment, the cover plate has an operating hole, and the hand crank has an anti-dislodgement groove.

[0027] In a preferred embodiment, it further includes: a travel limit mechanism;

[0028] The travel limiting mechanism includes: a limiting block, a stop block, a toggle block, a rotating block, and a torsion spring;

[0029] The limiting block is fixedly connected to the output shaft, and the limiting block is provided with a limiting protrusion; the actuating block is fixedly connected to the limiting shaft, and the actuating block is provided with an actuating protrusion; the limiting shaft is connected to the second output shaft through gear transmission; the stop block and the rotating block are respectively fixed at both ends of the rotating shaft; the rotating shaft is rotatably connected to a fixing plate, and the fixing plate is fixedly connected to the chassis; the torsion spring is installed on the outside of the rotating shaft, and the torsion spring causes the rotating block to face the actuating block;

[0030] In a preferred embodiment, the stop block is provided with a concave arc, the concave arc being concentric with the protrusion, and the radius of the concave arc being greater than the radius of rotation of the protrusion.

[0031] One embodiment of this utility model includes: a chassis, a gearbox, an indicating device, a manual operating device, a motor, and an output shaft. The chassis includes a chassis body and a chassis cover. The motor is fixed inside the chassis body. The output end of the motor is connected to the output shaft via a transmission mechanism. One end of the output shaft is fixedly connected to the input end of the gearbox, and the other end of the output shaft extends out of the chassis and is connected to a tap changer. When the motor rotates, it drives the output shaft to rotate, thereby actuating the tap changer. The output end of the gearbox is connected to the indicating device; the gearbox drives the indicating device through gear transmission, causing the indicating device to display the current working status. The manual operating device is connected to the gearbox. If the motor is powered off or damaged, the input end of the gearbox can be rotated via the manual operating device, thereby rotating the output shaft, and the tap changer can be operated manually.

[0032] The electric operating mechanism for tap changers disclosed in this utility model has a relatively simple and reasonable structure, a compact layout, and saves space. It solves the problems of low reliability and susceptibility to malfunctions caused by complex structures and numerous components in existing technologies. The manual operating device allows for manual control of the tap changer in the event of a motor power failure or malfunction. The input shafts for both manual and electric operation are the same, and both achieve the same effect. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of an electric operating mechanism for a tap changer according to one embodiment of the present disclosure;

[0035] Figure 2 This is a schematic diagram of the structure of an electric operating mechanism for a tap changer according to one embodiment of the present disclosure (chassis removed);

[0036] Figure 3 This is a schematic diagram of a gearbox structure according to one embodiment of the present disclosure;

[0037] Figure 4 This is a schematic diagram of a gearbox structure according to one embodiment of the present disclosure (gearbox body deleted);

[0038] Figure 5 This is a schematic diagram of an indicator device structure according to one embodiment of the present disclosure;

[0039] Figure 6 A cross-sectional view of an indicator device according to one embodiment of the present disclosure;

[0040] Figure 7 This is a schematic diagram of an indicator disk structure according to one embodiment of the present disclosure;

[0041] Figure 8 This is a schematic diagram of a manual operation device according to one embodiment of the present disclosure;

[0042] Figure 9 This is a schematic diagram of a manual operation device according to one embodiment of the present disclosure;

[0043] Figure 10 This is a schematic diagram showing different working states of a manual operating device according to one embodiment of the present disclosure;

[0044] Figure 11 for Figure 10 The BB section view shown;

[0045] Figure 12 This is a schematic diagram of a manual tool structure according to one embodiment of the present disclosure;

[0046] Figure 13 This is a schematic diagram of a travel limiting mechanism according to one embodiment of the present disclosure;

[0047] Figure 14 for Figure 13 The enlarged view at point A is shown below;

[0048] Figure 15 This is a schematic diagram of the structure of a limiting block and a stop block according to one embodiment of the present disclosure;

[0049] Figure 16 This is a structural schematic diagram of another working state of the limiting block and the stop block according to one embodiment of the present disclosure;

[0050] Figure 17 This is a schematic diagram of the structure of a toggle block according to one embodiment of the present disclosure;

[0051] Figure 18 This is a schematic diagram of a torsion spring fixing structure according to one embodiment of the present disclosure.

[0052] [Explanation of Key Component Symbols]

[0053] 1. Chassis;

[0054] 11; 12. Chassis cover;

[0055] 111. Groove;

[0056] 2. Gearbox;

[0057] 21. Housing; 22. Input shaft; 23. First output shaft; 24. Second output shaft; 25. Third output shaft; 26. First driven shaft; 27. Second driven shaft; 28. Limit shaft;

[0058] 241 cam;

[0059] 3. Indicating device;

[0060] 31. Indicator dial; 32. Rotation pointer; 33. Gear pointer; 34. Large gear; 35. Large gear support device;

[0061] 311. Small clock face; 312. Large clock face; 313. First transparent window; 314. Second transparent window;

[0062] 351. Pin; 352. Flange bearing; 353. Sleeve;

[0063] 4. Manual operation device;

[0064] 41. Operating shaft; 42. Housing; 43. Cover plate; 44. Tension spring; 45. Hand tool;

[0065] 411. Interface; 412. Bevel gear;

[0066] 431. Moving rod; 432. Operating hole;

[0067] 451. Handle; 452. Center rod; 453. Hand crank; 454. Connector; 455. Anti-disengagement mechanism;

[0068] 5 motors;

[0069] 6. Output shaft

[0070] 7. Micro switch;

[0071] 8. Angle encoder;

[0072] 9. Travel limit mechanism;

[0073] 91. Limiting block; 92. Stopping block; 93. Actuating block; 94. Rotating block; 95. Torsion spring; 96. Rotating shaft; 97. Fixing plate;

[0074] 911. Limiting protrusion; 921. Concave arc; 931. Actuating protrusion; 951. Torsion spring outer arm; 952. First pin; 953. Second pin. Detailed Implementation

[0075] The following detailed description of an electric operating mechanism for a tap changer, in conjunction with the accompanying drawings and embodiments of the present invention, provides further information on such a mechanism.

[0076] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0077] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0078] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0079] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0080] See Figures 1-18 This utility model provides a technical solution:

[0081] An electric operating mechanism for a tap changer includes: a housing 1, a gearbox 2, an indicator 3, a manual operating device 4, a motor 5, and an output shaft 6;

[0082] The chassis includes a chassis body 11 and a chassis cover 12, which are hinged together. The motor 5 is fixed inside the chassis body 11. The output end of the motor 5 is connected to the output shaft 6 through a transmission mechanism. One end of the output shaft 6 is fixedly connected to the input end of the gearbox 2, and the other end of the output shaft 6 extends out of the chassis and is connected to the tap switch. The output end of the gearbox 2 is connected to the indicator device 3. The manual operation device 4 is connected to the gearbox 2.

[0083] The motor rotates, driving the output shaft 6 to rotate, which in turn actuates the tap changer. The output shaft 6 is fixedly connected to the input end of the gearbox 2, so the input end of the gearbox 2 rotates with the output shaft 6. The gearbox 2 drives the indicator device 3 through gear transmission, causing the indicator device 3 to display the current working status. The manual operation device 4 is connected to the gearbox transmission. If the motor 5 is de-energized or damaged, the input end of the gearbox can be rotated through the manual operation device 4, which in turn drives the output shaft 6 to rotate, allowing the tap changer to be operated manually.

[0084] Gearbox 2 includes: housing 21 ( Figure 3 The box shown is set to transparent, displaying only the lines. Figure 4 The housing 21), input shaft 22, first output shaft 23, and second output shaft 24 have been removed. The housing 21 is fixed inside the chassis 11. The input shaft 22, first output shaft 23, and second output shaft 24 are rotatably connected to the housing 21. The input shaft 22 is connected to the motor 5 via a belt. The first output shaft 23 is connected to the input shaft 22 via gear transmission. The transmission ratio is a first set value. One end of the first output shaft 23 is connected to the indicator device 3.

[0085] The second output shaft 24 is connected to the first output shaft 23 via gear transmission. The transmission ratio between the second output shaft 24 and the first output shaft 23 is a second set value. The second output shaft is also connected to the indicator device 3.

[0086] In one embodiment, the first setting value is 33, that is, the transmission ratio between the first output shaft 23 and the input shaft 22 is 33, and the second setting value is 5, that is, the transmission ratio between the second output shaft 24 and the first output shaft 23 is 5.

[0087] To facilitate gear layout and transmission ratio design, gearbox 2 also includes: a third output shaft 25, a first driven shaft 26, and a second driven shaft 27;

[0088] The first driven shaft 26 is connected to the input shaft 22 via gear transmission. The middle part of the first output shaft 23 is connected to the first driven shaft 26 via worm gear transmission. One end of the first output shaft 23 is connected to the indicator device 3, and the other end is connected to the cam 241. A micro switch 7 is provided on one side of the cam.

[0089] The second driven shaft 27 is connected to the first output shaft 23 via a worm gear transmission. One end of the second output shaft 24 is connected to the second driven shaft 27 via a bevel gear transmission. One end of the second output shaft 24 is connected to the indicator device 3.

[0090] The third output shaft 25 is connected to the second driven shaft 27 via a worm gear transmission, and one end of the third output shaft 25 is connected to an angle encoder 8.

[0091] This disclosure employs worm gear transmission, resulting in a compact product structure that can accommodate a large transmission ratio in the electric operating mechanism of the tap changer. The transmission is smooth and reliable with low noise.

[0092] In one embodiment, the transmission ratio between the first driven shaft 26 and the input shaft 22 is 33 / 30, and the transmission ratio between the middle part of the first output shaft 23 and the first driven shaft 26 is 30, so the transmission ratio between the first output shaft 23 and the input shaft 22 is 33. Since one end of the first output shaft 23 is connected to the indicator device 3, when the input shaft 22 rotates one revolution, the indicator device rotates 1 / 33 of a revolution; when the input shaft 22 rotates 33 revolutions, the indicator device 3 rotates one revolution, and the micro switch 7 opens and closes once, completing one gear shift.

[0093] The transmission ratio between the second driven shaft 27 and the first output shaft 23 is 5, and the transmission ratio between the second output shaft 24 and the second driven shaft 27 is 1. Therefore, the transmission ratio between the second driven shaft 27 and the first output shaft 23 is 5.

[0094] The transmission ratio between the third output shaft 25 and the second driven shaft 27 is 7, so the transmission ratio between the third output shaft 25 and the first output shaft 23 is 35. That is, for every 35 rotations of the first output shaft, the third output shaft 25 rotates once, and the angle encoder 8 rotates once.

[0095] To facilitate reading the working status shown by the indicator device 3, the indicator device 3 includes an indicator dial 31, a rotation pointer 32, a gear pointer 33, a large gear 34, and a large gear support device 35;

[0096] The indicator dial 31 is fixed to the outside of the housing 11. The indicator dial includes two clock faces: a smaller clock face 311 for displaying the number of revolutions and a larger clock face 312 for displaying the gear position. A first transparent window 313 is provided in the center of the smaller clock face to display the number of revolutions, and a second transparent window 314 is provided between the smaller clock face 311 and the larger clock face 312 to display the gear position. Preferably, the outer side of the indicator dial 31 is a layer of transparent material, such as PVC, and the smaller clock face 311 and the larger clock face 312 are fixed inside the transparent material.

[0097] The clock face pointer 32 is disc-shaped with pointer markings on its surface. The clock face pointer 32 is fixedly connected to one end of the first output shaft 23. The clock face pointer is located at the rear of the input shaft 22 and can be seen through the first transparent window 313 from outside the chassis 11. The small clock face pointer moves one notch for every revolution of the input shaft 22.

[0098] The large gear support device 35 is rotatably fixed inside the housing 11. The large gear support device 35 supports the large gear 34, which meshes with the gear on the second output shaft 24. The gear position pointer 33 is ring-shaped and fixed to one side of the large gear 34. The gear position pointer 33 has pointer markings and is located at the rear end of the second transparent window 314, allowing it to be seen from outside the housing 11 through the second transparent window 314. The large gear 34 is coaxial with the first output shaft 23, making the rotation pointer 32 and the gear position pointer coaxial, and also coaxial with the indicator dial 31. For every revolution of the small clock face hand, the large clock face hand moves one increment.

[0099] In one embodiment, the small clock face 311 has 33 divisions, and the large clock face 312 has 35 divisions. The transmission ratio between the large gear 34 and the second output shaft 24 is 7, and the transmission ratio between the large gear 34 and the first output shaft 24 is 35, that is, for every one revolution of the small clock face hand, the large clock face hand rotates one division, which is 1 / 35 of a revolution.

[0100] To ensure stable rotation of the large gear 34, the large gear support device 35 includes a pin 351 and flange bearings 352. One end of the pin 351 is fixedly connected to the gearbox housing 21. Two flange bearings 352 are sleeved on the outside of the pin 351, with their flanges located on opposite sides of the large gear 34. Each pair of flange bearings 352 forms a group, and multiple groups of flange bearings 352 support the large gear 34. Depending on the size of the large gear 34, generally 3-8 groups of flange bearings 352 are required. To facilitate the positioning of the flange bearings 352, a sleeve 353 is provided on the outside of the pin 351. One end of the sleeve 353 is close to the inner ring of the flange bearing 352, and the other end is close to the gearbox housing 21.

[0101] To prevent the electric operating mechanism of the tap changer from failing to work due to power failure or damage to the motor, the manual operating device 4 includes: an operating shaft 41 and a housing 42.

[0102] The housing 42 is fixed inside the chassis 11. The operating shaft 41 is rotatably connected to the housing 42. One end of the operating shaft 41 has an interface 411, and the other end is equipped with a bevel gear 412. The lower end of the input shaft 22 is equipped with a bevel gear. The operating shaft 41 and the input shaft 22 are driven by the meshing of the bevel gears. In this way, when the motor cannot work, a tool that is compatible with the interface 411 can be used to rotate the operating shaft 41. The operating shaft 41 is driven to rotate by the bevel gear 412. The input shaft 22 is fixedly connected to the output shaft 6, which allows the electric operating mechanism of the tap changer to be controlled manually. The number of rotations and the gear position can be read normally through the indicator panel.

[0103] To facilitate manual operation, the manual operation device 4 also includes: a cover plate 43, a tension spring 44, and a manual tool 45;

[0104] The cover plate 43 is movably mounted on the outside of the housing 42 and is located between the chassis 11 and the housing 42. The cover plate 42 has an elongated groove as a guide groove, and bolts are used to fix it to the housing 42 through the guide groove, so that the cover plate 43 can be moved along the direction of the guide groove. Preferably, two bolts are set in the guide groove, and the length of the guide groove is greater than the distance between the two bolts. The length of the guide groove minus the distance between the two bolts is the movable displacement of the cover plate 43. Preferably, a guide groove is set on the top and bottom of the cover plate 43. One end of the tension spring 44 is fixedly connected to the cover plate 43, and the other end is fixedly connected to the housing 42. Pulling the cover plate 43 towards the tension spring 44 makes the cover plate 43 cover the interface 411. When manual operation is required, push the cover plate 43 to expose the interface 411, and operation can be performed.

[0105] A movable rod 431 is provided on the surface of the cover plate 43, and a slot 111 is opened in the chassis 11. The movable rod 431 passes through the slot 111 and extends out of the chassis 11. The slot 111 is long and narrow, so the movable rod 431 can move in the slot. Manual operation can be performed without opening the chassis 11. By pushing the movable rod 431, the interface 411 is exposed at the slot 111, and tools can be used for operation.

[0106] like Figure 8 and Figure 9 As shown, at this time, the cover plate 43 covers the interface 411, and the moving rod 431 is pushed to move the cover plate 43 to the interface 411. Figure 10 and Figure 11 As shown, interface 411 is exposed at the location indicated, and tools can be used to operate it.

[0107] The manual tool 45 includes a handle 451, a middle rod 452, and a hand crank 453; the handle 451 is rotatably fixed to one end of the middle rod 452, the hand crank 453 is fixed to the other end of the middle rod 452, and a connector 454 is provided at the other end of the hand crank 453.

[0108] like Figure 1 As shown, when not in use, the manual tool 45 is locked inside the chassis cover 12 and can be removed when needed. The connector 454 of the manual tool 45 is compatible with it. In one embodiment, the interface 411 is a square slot and the cross-section of the connector 454 is square.

[0109] The cover plate 43 has an operating hole 432, and the hand crank 453 has an anti-dislodgement groove 455. The purpose of the operating hole 432 and the anti-dislodgement groove 455 is to prevent the hand tool 45 from falling off during manual operation. During manual operation, by pushing the moving rod 431, the interface 411 is exposed at the groove 111. Then, the connector 454 of the hand tool 45 is inserted into the interface 411. At this time, the moving rod 431 is released, and under the action of the tension spring 44, the cover plate 43 moves towards the tension spring side. At this time, the edge of the operating hole 432 of the cover plate 43 is stuck in the anti-dislodgement groove 455. No matter whether the hand tool 45 is rotated or released, the hand tool 45 will not fall off. To remove the hand tool 45, the moving rod 431 must first be pushed away from the tension spring so that the edge of the operating hole 432 is no longer stuck in the anti-dislodgement groove 455, and the hand tool 45 can be easily removed.

[0110] To ensure that the output shaft 6 of the tap changer electric operating mechanism can reliably stop when it reaches the end point, the tap changer electric operating mechanism also includes: a travel limit mechanism 9;

[0111] The travel limit mechanism 9 includes: a limit block 91, a stop block 92, a toggle block 93, a rotating block 94, and a torsion spring 95;

[0112] like Figure 13 and Figure 14 The diagram shows a travel limit mechanism ( Figure 13 and Figure 14 (Contains hidden components such as chassis 1 and belt drive). Limiting block 91 is fixedly connected to output shaft 6, and limiting block 91 is provided with limiting protrusion 911. Stop block 92 is provided on one side of limiting block 91. If stop block 92 rotates, it will restrict the rotation of limiting block 91. Actuating block 93 is fixedly connected to limiting shaft 28, and actuating protrusion 931 is provided on the actuating block. Limiting shaft 28 is connected to second output shaft 24 through gear transmission. Stop block 92 and rotating block 94 are respectively fixed at both ends of rotating shaft 96. Rotating shaft is rotatably connected to fixing plate 97, and fixing plate 97 is fixedly connected to chassis 11. Torsion spring 95 is installed on the outside of rotating shaft 96. Torsion spring 95 causes rotating block 94 to face actuating block 93.

[0113] The limiting shaft 28 rotates with the second output shaft 24. When the toggle protrusion 931 rotates with the toggle block 93 to the position of the rotating block 94, the toggle block 93 continues to rotate, causing the rotating block 94 to rotate. At this time, the rotating shaft 96 rotates accordingly, driving the stop block 92 to rotate. The rotated stop block 92 will restrict the rotation of the limiting block 91, thereby restricting the rotation of the output shaft 6.

[0114] In one embodiment, the transmission ratio between the limiting shaft 28 and the second output shaft 24 is 1.

[0115] The stop block 92 is provided with a concave arc 921. Under the action of the torsion spring 95, the concave arc 921 is concentric with the protrusion 911, and the radius of the concave arc 921 is larger than the rotation radius of the protrusion 911. Thus, under the action of the torsion spring 95, the limit block 91 rotates with the output shaft 6, and the stop block 92 will not interfere with the rotation of the limit block 91. The working state is as follows. Figure 15 As shown. If the actuating block 93 causes the rotating block 94 to rotate, the stop block 92 will rotate accordingly, and after rotation, it will be as shown. Figure 16 As shown, the concave arc 921 and the protrusion 911 are not concentric. The stop block 92 interferes with the rotation of the limiting block 91, preventing the limiting block 91 from rotating and thus braking the output shaft 6. Figure 16 As shown.

[0116] Torsion spring 95 fixing structure as follows Figure 18 As shown, the torsion spring 95 extends two outer arms 951, the lower surface of the stop block 92 fixes the first pin 952, and the upper surface of the fixing plate 97 is fixedly connected to the second pin 953. The first pin 952 and the second pin 953 are located between the two outer arms 951. The above description is only a preferred embodiment of this utility model and is not intended to limit the protection scope of this utility model.

Claims

1. An electrically operated mechanism for a tap changer, characterized in that, include: Components: chassis (1), gearbox (2), indicator (3), manual operation device (4), motor (5), output shaft (6); Fixed inside the chassis (11), the output end of the motor (5) is connected to the output shaft (6) through the transmission mechanism. One end of the output shaft (6) is fixedly connected to the input end of the gearbox (2). The other end of the output shaft (6) extends out of the chassis and is connected to the tap switch. The output end of the gearbox (2) is connected to the indicator device (3). The manual operation device (4) is connected to the gearbox (2).

2. The electric operating mechanism for a tap changer according to claim 1, characterized in that, The gearbox (2) includes: a housing (21), an input shaft (22), a first output shaft (23), and a second output shaft (24); The housing (21) is fixed inside the chassis (11). The input shaft (22), the first output shaft (23) and the second output shaft (24) are rotatably connected to the housing (21). The input shaft (22) is connected to the motor (5) via a belt. The first output shaft (23) is connected to the input shaft (22) via gear transmission. The transmission ratio is a first set value. One end of the first output shaft (23) is connected to an indicator device (3). The second output shaft (24) is connected to the first output shaft (23) via gear transmission, and the transmission ratio between the second output shaft and the first output shaft is a second set value.

3. The electric operating mechanism for a tap changer according to claim 2, characterized in that, The gearbox (2) also includes: a third output shaft (25), a first driven shaft (26), and a second driven shaft (27); The first driven shaft (26) is connected to the input shaft (22) by gear transmission. The middle part of the first output shaft (23) is connected to the first driven shaft (26) by worm gear transmission. One end of the first output shaft (23) is connected to the indicator device (3), and the other end is connected to the cam (241). A micro switch (7) is provided on one side of the cam. The second driven shaft (27) is connected to the first output shaft (23) via a worm gear drive. One end of the second output shaft (24) is connected to the second driven shaft (27) via a bevel gear drive. One end of the second output shaft (24) is connected to an indicator device (3). The third output shaft (25) is connected to the second driven shaft (27) via a worm gear transmission, and one end of the third output shaft (25) is connected to an angle encoder (8).

4. The electric operating mechanism for a tap changer according to claim 2, characterized in that, The indicator device (3) includes an indicator disc (31), a rotation pointer (32), a gear pointer (33), a large gear (34), and a large gear support device (35). The indicator dial (31) is fixed to the outside of the chassis (11), and the rotation pointer (32) is fixedly connected to one end of the first output shaft (23); The large gear support device (35) is rotatably fixed inside the chassis (11). The large gear support device (35) supports the large gear (34). The large gear (34) meshes with the gear on the second output shaft (24). The gear pointer (33) is fixed on one side of the large gear (34). The large gear (34) is coaxial with the first output shaft (23).

5. The electric operating mechanism for a tap changer according to claim 4, characterized in that, The large gear support device (35) includes a pin (351) and a flange bearing (352). One end of the pin (351) is fixedly connected to the housing (21). Two flange bearings (352) are sleeved on the outside of the pin (351). The flanges of the two flange bearings (352) are respectively located on the outside of the large gear (34). Multiple sets of flange bearings (352) support the large gear (34).

6. The electric operating mechanism for a tap changer according to claim 2, characterized in that, The manual operating device (4) includes: an operating shaft (41) and a housing (42); The housing (42) is fixed inside the chassis (11). The operating shaft (41) is rotatably connected to the housing (42). One end of the operating shaft (41) has an interface (411) and the other end has a bevel gear (412). The lower end of the input shaft (22) has a bevel gear. The operating shaft (41) and the input shaft (22) are driven by gear meshing.

7. The electric operating mechanism for a tap changer according to claim 6, characterized in that, The manual operating device (4) also includes: a cover plate (43), a tension spring (44), and a manual tool (45); The cover plate (43) is movably installed on the outside of the housing (42). One end of the tension spring (44) is fixedly connected to the cover plate (43), and the other end is fixedly connected to the housing (42). The cover plate is pulled to the side of the tension spring (44) so ​​that the cover plate (43) covers the interface (411). A movable rod (431) is provided on the surface of the cover plate (43), and a slot (111) is opened in the chassis (11). The movable rod (431) passes through the slot (111) and extends out of the chassis (11). The manual tool (45) includes a handle (451), a middle rod (452), and a hand crank (453); the handle (451) is rotatably fixed to one end of the middle rod (452), the hand crank (453) is fixed to the other end of the middle rod (452), and a connector (454) is provided at the other end of the hand crank (453).

8. The electric operating mechanism for a tap changer according to claim 7, characterized in that, The cover plate (43) has an operation hole (432), and the hand crank (453) has an anti-dislodgement groove (455).

9. The electric operating mechanism for a tap changer according to claim 2, characterized in that, Also includes: Travel limit mechanism (9); The travel limiting mechanism (9) includes: a limiting block (91), a stop block (92), a toggle block (93), a rotating block (94), and a torsion spring (95); The limiting block (91) is fixedly connected to the output shaft (6), and the limiting block (91) is provided with a limiting protrusion (911); the actuating block (93) is fixedly connected to the limiting shaft (28), and the actuating block is provided with an actuating protrusion (931); the limiting shaft (28) is connected to the second output shaft (24) through gear transmission; the stop block (92) and the rotating block (94) are respectively fixed at both ends of the rotating shaft (96), the rotating shaft (96) is rotatably connected to the fixing plate (97), and the fixing plate (97) is fixedly connected to the chassis (11); the torsion spring (95) is installed on the outside of the rotating shaft (96), and the torsion spring (95) makes the rotating block (94) face the actuating block (93).

10. The electric operating mechanism for a tap changer according to claim 9, characterized in that, The (92) is provided with a concave arc (921), which is concentric with the protrusion (911), and the radius of the concave arc (921) is greater than the radius of rotation of the protrusion (911).

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