A no-excitation tap-changer operating structure

Abstract

The present invention discloses a no-excitation tap-changer operating structure, which includes a mounting flange, a main shaft mounted on the mounting flange, and a box body mechanism connected to the upper end of the main shaft. It is characterized in that: the box body mechanism includes a box body, a driving shaft and a display shaft arranged in the box body. The driving shaft includes an input shaft and an output shaft arranged concentrically with the input shaft. The output shaft is connected to the main shaft, and the display shaft is connected to the input shaft or the output shaft through a display transmission mechanism. A gear position display mark is arranged on the display shaft. The structure of the present invention is simple, reliable and safe to use. Through different gear ratios in the display transmission mechanism, no matter how many degrees the input shaft rotates to change a gear, the gear position word plate on the display shaft always rotates a fixed angle, making the display systems of various switch operating mechanisms unified, improving production efficiency, facilitating quality control, and enhancing the general performance of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of off-circuit tap-changers, and particularly to an operating structure of an off-circuit tap-changer. Background Art

[0002] Existing off-circuit tap-changers (hereinafter referred to as switches) have main structural forms such as drum-shaped, cylindrical, cage-shaped, squirrel-cage-shaped, and strip-shaped. Due to the different mechanical movement modes of the moving contacts of the switch body during gear shifting and the different rotation angles of the mechanism during gear conversion, each type of switch has its own different operating mechanisms. For the same type of switch, different operating mechanisms correspond to different gears or the indexing of the static contact positions. Especially after the requirements for remote gear display and electrical interlock protection functions of the switch are added, the types of operating mechanisms are numerous and the installation dimensions are different, which brings many inconveniences to the manufacturing and application of transformer and switch manufacturers.

[0003] In addition, the box body mechanism part of the existing operating mechanism of the off-circuit tap-changer is integrated with the mounting flange, and the output shaft of the mechanism and the main shaft are an integral shaft, which makes it extremely inconvenient to maintain and replace the mechanism. For example, when the mounting flange of the mechanism leaks oil, all the parts of the box body assembly need to be disassembled for maintenance. When the mechanism needs to be replaced, part of the transformer oil must be drained for operation.

[0004] The Chinese Patent Office announced "An Operating Mechanism of a Tap-Changer" in CN 22099032 Y, which mainly includes an input shaft, an output shaft, a box body cover, and a coupling disk (mounting flange), which can reduce the operating torque by several times and make the operation labor-saving. However, there are the following problems in the use process: a. A reduction gear transmission chain is set, which multiplies the output operating torque. When the torque of the off-circuit tap-changer body itself is very small, using this mechanism will result in no operating feel during gear shifting. At this time, a non-labor-saving operating mechanism needs to be designed separately to meet the operating feel requirements of small-torque switches. b. When the shaft core of the coupling disk (mounting flange) leaks oil, all the reduction gears in the box body mechanism need to be removed for maintenance, which brings inconvenience to maintenance. If the reduction gears are not reinstalled in the original orientation after maintenance, it will also lead to incorrect switch gears and cause major accidents of unreliable switch contact. c. When the mechanism needs to be replaced, the transformer oil in the transformer needs to be drained below the coupling disk (mounting flange) for replacement, resulting in a several-fold increase in on-site maintenance workload and cost, and an increase in quality risk. d. There is no electrical interlock protection function. When the transformer is switched on without the mechanism being operated in place, it will cause major accidents of poor switch contact. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an operating structure of an off-circuit tap-changer with reliable operation and good versatility in view of the above deficiencies of the existing technology.

[0006] The technical solution adopted by the present invention is as follows: A no-excitation tap-changer operating structure includes a mounting flange, a main shaft mounted on the mounting flange, and a box body mechanism connected to the upper end of the main shaft. It is characterized in that: the box body mechanism includes a box body, a driving shaft and a display shaft arranged in the box body. The driving shaft includes an input shaft and an output shaft arranged concentrically with the input shaft. The output shaft is connected to the main shaft, and the display shaft is connected to the input shaft or the output shaft through a display transmission mechanism. A gear position display mark is arranged on the display shaft.

[0007] According to the above technical solution, the display transmission mechanism includes a display transmission shaft arranged in the box body, a display transmission gear mechanism, and a display Geneva wheel fork mechanism. The display transmission shaft is connected to the input shaft or the output shaft through a gear transmission mechanism, and the display transmission shaft is connected to the display shaft through the display Geneva wheel fork mechanism.

[0008] According to the above technical solution, the input shaft and the output shaft are sleeved with each other, and a transmission shaft is also arranged in the box body. The transmission shaft is connected to the input shaft and the output shaft through a first transmission mechanism and a second transmission mechanism respectively.

[0009] According to the above technical solution, a positioning device is further provided. The positioning device includes a positioning disk connected to the input shaft and an elastic positioning pin arranged on the box body. The elastic positioning pin is configured with a positioning groove on the positioning disk. When shifting gears, the elastic positioning pin automatically snaps into the positioning groove under the action of spring pressure to realize the locking of the switch gear position.

[0010] According to the above technical solution, a microswitch is further provided to cooperate with the positioning device.

[0011] According to the above technical solution, a remote gear position display system is further provided. The remote gear position display system includes a display disk fixed on the box body and a support member fixedly connected to the display Geneva wheel in the display Geneva wheel fork mechanism. A gear position signal static contact, a gear position signal common contact, and a plug-in terminal are arranged on the display disk. All the contact signal points on the display disk are connected to the plug-in terminal. Corresponding to the gear position signal static contact and the gear position signal common contact on the support member, there are respectively gear position signal moving contacts.

[0012] According to the above technical solution, a remote electrical interlock protection system is further provided. The electrical interlock protection system includes a lockout protection signal common contact and a lockout protection signal static contact arranged on the display disk and a lockout protection signal moving contact arranged on the support member. The lockout protection signal moving contact is arranged corresponding to the lockout protection signal common contact and the lockout protection signal static contact.

[0013] According to the above technical solution, the gear position signal static contact and the lockout signal static contact correspond one-to-one with the number of gear positions and are circumferentially and evenly distributed. The included angle between each contact is consistent with the indexing angle of the display Geneva wheel.

[0014] According to the above technical solution, a microswitch cooperating with the positioning device is further provided.

[0015] According to the above technical solution, the input shaft is connected to the output shaft and is designed as a split type or integrally provided.

[0016] According to the above technical solution, the mounting flange and the box body mechanism are designed as a split type, and the box body mechanism is connected to the mounting flange through fasteners.

[0017] According to the above technical solution, the box body includes a base fixed on the mounting flange, and a support plate disposed opposite to the base and arranged above the base. The base and the support plate are used to support each shaft that is parallel to each other. A rain shield is further configured on the box body, and a gear position observation window is provided on the rain shield.

[0018] According to the above technical solution, a wrench fixing device for storing a wrench is provided below the rain shield on the side of the box body.

[0019] According to the above technical solution, two signal line outlet holes are provided on the base.

[0020] According to the above technical solution, the box body is circular or non-circular.

[0021] According to the above technical solution, a wrench position is provided on the input shaft.

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

[0023] 1. The structure of the present invention is simple, and it is reliable and safe to use. It shows that through different gear ratios in the transmission mechanism, a switch that changes gears regardless of how many degrees the input shaft rotates is realized. The gear position nameplate on the display shaft always rotates a fixed angle, making the display systems of various switch operating mechanisms unified, improving production efficiency, facilitating quality control, and improving the general performance of this device.

[0024] 2. By setting a remote gear position display system, an electrical gear position display signal is provided for the gear position display in the background control room, realizing the function of remotely displaying the switch gear position;

[0025] 3. By setting an electrical interlock protection system, it is used to prevent the transformer from closing when the switch fails to shift gears properly or the transformer cannot close when the switch is shifting gears, ensuring that the transformer can operate only when the switch is in the normal working position. The electrical interlock protection adopts a double-loop protection of a display panel and a microswitch, improving the protection reliability.

[0026] 4. The transmission system provides power for the switch to shift gears. By setting different gear ratios, different output angles can be realized (such as when the input shaft rotates 360°, the output shaft rotates 33°, 42°, 60°, 360°, 450°, etc.), which can meet the shifting requirements of various switches and achieve labor-saving transmission.

[0027] 5. The box body mechanism part and the mounting flange part are of a split structure, which is convenient for maintaining the oil leakage of the mounting flange and replacing the whole box body mechanism.

[0028] 6. The box body mechanism is provided with two cable outlet holes and is equipped with two cable heads, so that the remote gear position display signal line and the electrical interlock protection signal line are led out from the two cable heads respectively, and signal interference will not occur.

[0029] 7. The general operating mechanism of the modular combination integrating transmission, gear position indication, remote gear position display, electrical interlock protection and positioning in the present invention integrates a transmission-saving mechanism, a gear position display mechanism and mechanisms with various input and output angles into a box body mechanism, realizing unified appearance and installation dimensions. At the same time, different modules can be selected for combination according to actual working conditions, and it has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the front view of the external shape of Embodiment 1 of the present invention.

[0031] Figure 2 is Figure 1 the B-B view of

[0032] Figure 3 It is the main sectional view of Embodiment 1 of the present invention.

[0033] Figure 4 It is the main sectional view of the positioning device provided by the embodiment of the present invention.

[0034] Figure 5 It is the top view (without support plate) of the positioning device provided by the embodiment of the present invention.

[0035] Figure 6 is Figure 5 the C-C view (with support plate) of

[0036] Figure 7 It is the main sectional view of Embodiment 2 of the present invention.

[0037] Figure 8 It is the main sectional view of Embodiment 3 of the present invention.

[0038] Figure 9 It is the front view of the display disc in Embodiment 3 of the present invention.

[0039] Figure 10 It is the main sectional view of the support in Embodiment 3 of the present invention.

[0040] Figure 11 It is the external view of the support in Embodiment 3 of the present invention.

[0041] Figure 12 It is the main sectional view of Embodiment 4 of the present invention.

[0042] Figure 13 This is the front view of the external shape of Embodiment 5 of the present invention.

[0043] Figure 14 It is Figure 13 the A-A view of

[0044] Figure 15 This is the main sectional view of Embodiment 5 of the present invention.

[0045] Figure 16 This is the main sectional view of Embodiment 6 of the present invention.

[0046] Figure 17 This is the main sectional view of Embodiment 7 of the present invention.

[0047] Figure 18 This is the main sectional view of Embodiment 8 of the present invention. Detailed implementation manners

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] Embodiment 1:

[0050] As Figures 1-3 shown, this embodiment provides a non-excitation tap-changer operating structure, including a mounting flange 8, a main shaft 7 mounted on the mounting flange 8, and a box body mechanism connected to the upper end of the main shaft 7. The box body mechanism includes a box body, a driving shaft and a display shaft 15 arranged in the box body. The box body includes a base 3 fixed to the mounting flange 8 by bolts 6, and a support plate 18 oppositely arranged to the base and arranged above the base. The base 3 and the support plate 18 are used to support the parallel shafts. A rain shield 2 is also configured on the box body, and a gear position observation window 1 is arranged on the rain shield.

[0051] The driving shaft includes an input shaft 14 and an output shaft 5 arranged concentrically with the input shaft. The output shaft 5 is connected to the main shaft 7, and the display shaft 15 is connected to the input shaft or the output shaft through a display transmission mechanism. A gear position display mark is arranged on the display shaft. In this embodiment, the input shaft 14 and the output shaft 5 are directly connected and are an integral shaft, realizing a mechanism with a 1:1 input and output (such as when the input is 60°, 360°, etc., the output is 60°, 360°, etc.). The display shaft 15 is taken as an example for illustration by being connected to the input shaft 14 through a display transmission mechanism. To better understand this embodiment, taking the input rotating 60° and the output rotating 60° to change a gear as an example, the external shape structure of this embodiment is as Figure 1 , 2 shown (non-circular box body mechanism).

[0052] The display drive mechanism includes a display drive shaft 16 installed in the box body, a display gear drive mechanism, and a display Geneva wheel fork mechanism. The display drive shaft is connected to the input shaft or output shaft through the display gear drive mechanism, and the display drive shaft is connected to the display shaft through the display Geneva wheel fork mechanism. Specifically, as shown in the figure, the display gear drive mechanism includes a display gear 29 connected to the input shaft 14 and a display gear fork 30 sleeved on the display drive shaft 16. The display Geneva wheel fork mechanism includes the display gear fork 30 and a display Geneva wheel 31 installed on the display shaft. The display gear fork 30 is set as an integrated structure of a gear and a fork, with a gear meshing with the display gear 29 below and a fork cooperating with the display Geneva wheel 31 above.

[0053] As Figures 4-6 shown, this embodiment is also provided with a positioning device for locking the switch gear position. The positioning device includes a positioning disk 24 connected to the input shaft 14, a force application mechanism installed on the box body, an eccentric disk 40 connected to the output end of the force application mechanism, and a positioning pin 25 connected to the eccentric disk through a shaft pin 41. The positioning pin is installed in a sliding groove of a support seat below the support plate. The positioning pin 25 is correspondingly arranged with a positioning groove 44 on the positioning disk and can enter or exit the positioning groove 44 of the positioning disk under the action of the force application mechanism. The positioning groove 44 is a square positioning groove, and the end of the positioning pin cooperating with the positioning groove is a square end.

[0054] In this embodiment, the force application mechanism includes a positioning handle 20 installed on the box body. The positioning handle 20 is installed above the support plate 18 and is connected to an eccentric disk 40 installed below the support plate through a rotating shaft 43 penetrating through the support plate.

[0055] This embodiment is also provided with a limiting mechanism for limiting the positioning pin when the positioning pin enters or exits the positioning groove. The limiting mechanism can be used for limiting the positioning handle 20, the eccentric disk, or the positioning pin. This embodiment will illustrate the limiting of the positioning pin. As Figure 5As shown in the figure, the limiting mechanism includes an elastic limiting member installed in the box body and two limiting slots 47 disposed opposite to the elastic limiting member and installed on the positioning pin. The elastic limiting member enters from one limiting slot into another limiting slot during the process of the positioning pin entering or exiting the positioning slot. The elastic limiting member includes a spring 46 installed in an installation slot 45 of a support seat 48 disposed below a support plate of the box body and a steel ball 42 connected to the spring. The steel ball 42 is disposed corresponding to the limiting slot 47. When a gear shift is required, the positioning handle 20 is rotated. The positioning handle 20 exits from the positioning slot 44, and the input shaft rotates to implement the gear shift operation of the non-excitation tap-changer. Since the positioning pin 25 and the positioning handle 20 are connected through an eccentric disc 40, the positioning pin 25 moves linearly along the slot of the support seat 48 during the exiting process, so that the elastic limiting member can easily exit from one of the limiting slots 47 (the right limiting slot). When the positioning pin 25 completely exits, the elastic limiting member enters into another limiting slot 47 (the left limiting slot) to implement the limitation of the positioning pin 25. After the input shaft implements the gear shift operation, the positioning handle 20 is rotated back, and the positioning pin 25 is reinserted into the positioning slot 44 to implement the positioning of the tap-changer gear position. At the same time, the elastic limiting member re-enters the left limiting slot 47, thereby implementing the limitation of the positioning pin 25. This positioning device has the advantages of high strength and reliable positioning.

[0056] In this embodiment, the operating mechanism adopts a split structure, which is composed of two parts, namely a box body mechanism and an installation flange (i.e., the box body mechanism and the installation flange are two independent components), and are connected into a whole through bolts 6. This split structure makes the operating mechanism convenient for maintenance and replacement.

[0057] The installation flange part is mainly composed of a main shaft 7, an installation flange 8, etc. A welding flange 9 is welded on the transformer tank cover 10. The installation flange 8 is fixed on the welding flange 9 through bolts. The lower end of the main shaft 7 of the installation flange is connected to the switch body to provide power for the gear shift of the switch moving contact. The upper end of the main shaft 7 is connected to the output shaft 5 of the box body, and the main shaft 7 rotates synchronously with the output shaft 5.

[0058] Among them, the box body mechanism adopts a unified shape and size to be installed on the installation flanges of various switches such as drum-shaped, cylindrical, cage-shaped, squirrel-cage-shaped, and strip-shaped, improving the versatility of the operating mechanism. The box body of the box body mechanism can be of a circular or non-circular structure (a circular structure is adopted in this embodiment).

[0059] The flat part at the upper part of the input shaft 14 is used to connect with a wrench 19, and the wrench 19 provides power for the input shaft 14. The wrench is fixed in a spring clip (i.e., a wrench fixing device) on the side of the box body when not in use.

[0060] When it is necessary to provide power for the switch shifting, the working process is as follows: use a wrench to rotate the input shaft 14, the input shaft 14 rotates 60° to drive the main shaft 7 to rotate 60° (the main shaft 7 is connected to the switch body, the switch body is omitted in the figure), and the main shaft 7 drives the switch body to shift gears. Similarly, the input shaft 14 rotates 60° to drive the display gear 29 to rotate, the display gear 29 drives the display gear fork 30 to rotate 360°, the display gear fork 30 drives the display groove wheel 31 to rotate 36°, the display groove wheel 31 drives the display shaft 15 to rotate 36°, the display shaft 15 drives the gear position plate 13 to rotate 36 degrees, the gear position plate 13 sets a gear position number every 36°, and the switch gear position number is observed from the observation hole of the support plate 18. The display gear and the display gear fork are matched by different gear ratios, so that when the input shaft 14 rotates 360°, 450°, 42°, 33°, etc., the display gear fork only rotates one circle, and the display groove wheel and the gear position plate always rotate at a fixed angle, so that the display system of various switch operating mechanisms is unified, which improves production efficiency and facilitates quality control. At the same time, the elastic positioning pin 25 is automatically inserted into the positioning groove under the action of the spring pressure to realize the switch gear locking. The gear position can be known through the display window on the support plate 18.

[0061] Embodiment 2:

[0062] like Figure 7 As shown, the structure of Example 2 is basically the same as that of Example 1, except that an electrical locking protection system is also installed. The function of the electrical locking protection system is to prevent the transformer from closing when the switch is not in place or the transformer cannot be closed when the switch is shifted, so as to ensure that the transformer can only operate when the switch is in the normal working position. The electrical locking protection system of this embodiment is a micro switch that cooperates with the positioning pin 25 of the positioning device. When the positioning pin 25 is unlocked (pulled out from the positioning groove), the collision micro switch 26 is activated, and at this time, NC in the circuit is opened and NO is turned on. The signal line of the micro switch 26 is connected in series to the closing circuit and circuit breaker of the transformer, so that the transformer can be closed when the switch is in place and cannot be closed when it is not in place.

[0063] Embodiment 3:

[0064] like Figure 8 As shown, the structure of this embodiment is basically the same as that of embodiment 1, except that an operating mechanism with a remote gear position display function is also provided.

[0065] Specifically, a remote gear position display system is also provided in the operating mechanism, and the remote gear position display system provides an electrical gear position display signal for the gear position display in the backstage control room, thereby realizing the function of remotely displaying the switch gear position. Figures 9-11As shown in the figure, the remote gear display system includes a display disk 21 fixed on a support plate 18 and a support member 32 fixedly connected to a display grooved pulley 31. On the display disk 21, there are gear position signal static contacts 37, a gear position signal common contact 36, and a plug-in terminal 33. There are multiple gear position signal static contacts. The tap switch generally has three gears, five gears, seven gears, or nine gears. In this embodiment, the nine-gear case is taken as an example for illustration, that is, 9 gear position signal static contacts are provided, which are arranged at intervals on the outer periphery of the gear position signal common contact 36 and are correspondingly connected to each gear position signal terminal. The gear position signal common contact 36 is an open arc-shaped structure, which is led out through a locking protection signal terminal. The contact signal points on the display disk are all connected to the plug-in terminal 33 through signal terminals.

[0066] As Figure 9 , a gear position signal common contact 36 and corresponding gear position signal static contacts 37 (that is, one gear position signal static contact is provided for one gear position) are arranged on the display disk 21. The included angle between adjacent gear position signal static contacts is the same as the indexing angle of the display grooved pulley 31, which is 36°. The gear position signal moving contact is installed in the support member 32. The gear position signal moving contact 39 is a structure of two parallel and series-connected moving contacts, and is respectively in contact with the gear position signal common contact 36 and the corresponding gear position signal static contacts 37. The support member 32 is rigidly fixed on the display grooved pulley 31 and rotates synchronously. When the display grooved pulley rotates 36°, the support member 32 rotates synchronously by 36°, and the display moving contact rotates from the original gear position to the adjacent gear position, realizing the electrical gear position signal transformation. The contact signals on the display disk are all connected to the plug-in terminal 33, and then connected to the terminal block 11 through the signal line 12. A cable head 4 is provided on the box body. The cable passes through one of the cable heads 4 and is connected to the terminal block 11. The other end of the cable is connected to the gear position display of the controller (the cable and the gear position display are omitted in the figure), realizing the remote gear position display. The electrical principle and description of the remote gear position display system are shown in Table 1. The display disk 21 adopts a printed circuit board structure, which has the advantages of small volume and reliable contact.

[0067] Table 1

[0068]

[0069] Example 4:

[0070] As Figure 12 shown, the structure of this embodiment is basically the same as that of Example 3, the difference being that: an electrical locking protection system is further provided.

[0071] The function of the electrical interlock protection system is to prevent the transformer from closing when the switch fails to shift into place or the transformer from being unable to close when the switch is shifting, ensuring that the transformer can operate only when the switch is in the normal working position. To improve reliability, the electrical interlock protection system adopts two-way electrical interlock protection. One way is set on the display panel 21, integrated with the remote gear position indication system. This electrical interlock protection system includes a protection signal common contact 35 and corresponding protection signal static contacts 34 (i.e., one gear position signal static contact is set for each gear position) on the display panel 21, and a locking protection signal moving contact 38 set on the support. The locking protection signal common contact 35 and the gear position signal common contact 36 are concentrically arranged and are also non-closed arc structures, which are led out through the locking protection signal terminals. There are nine locking protection signal static contacts 34, which are evenly spaced on the inner circumference of the locking protection signal common contact and are arranged in series, and are led out through the locking signal terminals. A locking protection signal moving contact 38 is set on the support 32. The locking protection signal moving contact 38 is a structure of two parallel and series-connected moving contacts, which are in contact with the protection signal common contact 35 and the protection signal static contacts 34. The support 32 rotates synchronously with the display sprocket 31 to make the protection signal contacts conduct and disconnect for locking protection, that is, when the support 32 is in place, terminals 11 and 12 in Table 1 are in the conducting state, and in the non-in-place state, they are in the disconnected state. The other electrical interlock protection system is a microswitch that cooperates with the positioning pin 25 of the positioning device. When the positioning pin 25 is unlocked (pulled out from the positioning groove), it collides with the microswitch 26 to actuate. At this time, NC in Table 1 opens and NO conducts. After the input shaft completes the shifting operation, the positioning pin 3 is reinserted into the positioning groove to realize the positioning of the tap changer gear position, and the microswitch 7 can be manually reset.

[0072] In this embodiment, two signal line outlet holes 4 are provided on the base, so that the remote gear position display signal and the electrical interlock protection signal line are led out separately without mutual signal interference. Connect the protection terminals 11 and 12 of the first-way electrical interlock protection system in Table 1 to the cable, and connect the protection terminal COM of the second-way electrical interlock protection system to NC or NO to the cable, and pass through from another signal line cable head 4 and be connected in series to the closing circuit and circuit breaker of the transformer to realize the function that the transformer can close when the switch shifts into place and cannot close when it is not in place.

[0073] When the operating mechanism does not require the remote display and electrical interlock protection functions or only requires one of the functions, it is only necessary not to install the above-mentioned remote display system and electrical interlock protection system or the components of one of the functions.

[0074] Embodiment 5:

[0075] As Figure 13 、 14As shown in Fig. 15, the structure of this embodiment is basically the same as that of Embodiment 1, except that: there is also a transmission system to achieve labor-saving transmission. The transmission system includes at least one-stage gear transmission mechanism arranged in the box body. The input shaft and the output shaft are connected by the gear transmission mechanism. In this embodiment, the two-stage transmission is taken as an example for illustration. As shown in the figure, the transmission system mainly consists of an input shaft 14, first-stage transmission gears 22 and 23, second-stage transmission gears 27 and 28, a transmission shaft 17, and an output shaft 5. That is, five parallel shafts 5, 14, 15, 16, and 17 are arranged on the box body base 3 and the support plate 18. Among them, the input shaft 14 and the output shaft 5 are of a nested shaft structure. The input shaft 14 and the transmission shaft 17 form a labor-saving structure to output the shifting torque. The input shaft 14 and the shafts 15 and 16 form gear position indication and remote gear position display conversion. Through the matching of different gear ratios of the two pairs of gears, namely the first-stage transmission gears 22 and 23, and the second-stage transmission gears 27 and 28, different output angles can be achieved (for example, when the input shaft rotates 360°, the output shaft rotates 33°, 42°, 60°, 360°, 450°, etc.), which can meet the shifting requirements of various switches.

[0076] Taking the example of the input shaft rotating 360° and the output shaft rotating 60° below, the principle of the transmission structure: Use a wrench 19 to rotate the input shaft 14. When the input shaft 14 rotates 360°, it drives the first-stage driving gear 22 to rotate. The first-stage driving gear drives the first-stage driven gear 23 to rotate. The transmission shaft 17 is rigidly connected to the first-stage driven gear 23 and rotates synchronously, driving the second-stage driving gear 27 to rotate. The second-stage driving gear drives the second-stage driven gear 28 to rotate. The second-stage driven gear 28 drives the output shaft 5 to rotate 60°. The output shaft 5 drives the main shaft 7 to rotate 60°. The main shaft 7 drives the switch body to shift gears (the main shaft 7 is connected to the switch body, and the switch body is omitted in the figure). The second-stage driven gear 28 can be designed as an incomplete gear structure to enable the mechanism to have a mechanical limit function at the extreme position.

[0077] In this embodiment, the box body mechanism adopts a unified shape and size to be installed on the mounting flanges of various switches such as drum-shaped, cylindrical, cage-shaped, squirrel-cage-shaped, and strip-shaped, improving the versatility of the operating mechanism. The box body of the box body mechanism can be of a circular or non-circular structure (a circular structure is adopted in this embodiment).

[0078] Embodiment 6:

[0079] As Figure 16 shown, the structure of this embodiment is basically the same as that of Embodiment 5, except that: an electrical interlock protection system is also installed. The structure of the electrical interlock protection system is the same as that of the electrical interlock protection system in Embodiment 2, that is, the structure of the microswitch 26 configured with the positioning device will not be elaborated here one by one.

[0080] Embodiment 7:

[0081] As Figure 17As shown, the structure of this embodiment is basically the same as that of Embodiment 6, except that: there is also a remote gear display system, and the structure of the remote gear display system is the same as that of the remote gear display system in Embodiment 3, which will not be elaborated here one by one.

[0082] Embodiment 8:

[0083] As Figure 18 shown, the structure of this embodiment is basically the same as that of Embodiment 6, except that: that is, the remote display gear display system is also provided with an electrical interlock protection system. The structure of the remote gear display system is the same as that of the remote gear display system in Embodiment 3, and the structure of the electrical interlock protection system is the same as that of the electrical interlock protection system in Embodiment 4, which will not be elaborated here one by one.

Claims

1. An off-circuit tap-changer operating structure, comprising a mounting flange, a main shaft mounted on the mounting flange, and a box body mechanism connected to the upper end of the main shaft, characterized in that: The box body mechanism includes a box body, an input shaft installed in the box body, an output shaft and a display shaft arranged concentrically with the input shaft. The output shaft is connected to the main shaft, and the display shaft is connected to the input shaft through a display transmission mechanism. A gear position display mark is provided on the display shaft. The display transmission mechanism includes a display transmission shaft installed in the box body, a display gear transmission mechanism, and a display Geneva wheel fork mechanism. The display transmission shaft is connected to the input shaft or the output shaft through the display gear transmission mechanism, and the display transmission shaft is connected to the display shaft through the display Geneva wheel fork mechanism. The input shaft and the output shaft are sleeved with each other, and at least one stage of gear transmission mechanism is also installed in the box body. The input shaft and the output shaft are connected through the gear transmission mechanism. A positioning device is also provided. The positioning device includes a positioning disk connected to the input shaft and an elastic positioning pin installed on the box body. The elastic positioning pin is configured with a positioning groove on the positioning disk. When shifting gears, the elastic positioning pin automatically snaps into the positioning groove under the action of spring pressure to achieve the locking of the switch gear position. A remote gear position display system is also provided. The remote gear position display system includes a display disk fixed on the box body and a support member fixedly connected to the display Geneva wheel in the display Geneva wheel fork mechanism. A gear position signal static contact, a gear position signal common contact, and a plug-in terminal are provided on the display disk. All the contact signal points on the display disk are connected to the plug-in terminal. A gear position signal moving contact is provided on the support member corresponding to the gear position signal static contact and the gear position signal common contact and abuts against them. A remote electrical interlock protection system is also provided. The electrical interlock protection system includes a lock protection signal common contact and a lock protection signal static contact provided on the display disk and a lock protection signal moving contact provided on the support member. The lock protection signal moving contact is correspondingly arranged with the lock protection signal common contact and the lock protection signal static contact. The gear position signal static contact and the lock signal static contact correspond one by one to the number of gear positions and are circumferentially evenly distributed. The included angle between each contact is consistent with the indexing angle of the display Geneva wheel. A micro switch cooperating with the positioning device is also provided.

2. The no-excitation tap-changer operating structure according to claim 1, characterized in that: The input shaft is connected to the output shaft and is designed as a split type or an integral type.

3. The no-excitation tap-changer operating structure according to claim 1, characterized in that: The mounting flange and the box body mechanism are designed as a split type, and the box body mechanism is connected to the mounting flange through fasteners.

4. The operating structure of the off-circuit tap-changer according to claim 1, characterized in that: The box body includes a base fixed on the mounting flange and a support plate arranged opposite to the base and installed above the base. The base and the support plate are used to support each shaft that is parallel to each other. A rain cover is also configured on the box body, and a gear position observation window is provided on the rain cover.

5. The operating structure of the off-circuit tap-changer according to claim 1, characterized in that: A wrench fixing device for storing a wrench is provided on the side of the box body below the rain cover.

6. The no-excitation tap-changer operating structure according to claim 1, characterized in that: Two independent signal line outlet holes are provided on the box body.

7. The operating structure of the off-circuit tap-changer according to claim 1, wherein: The box body is circular or non-circular.

8. The operating structure of the off-circuit tap-changer according to claim 1, characterized in that: A wrench position is provided on the input shaft.

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