A skid-free side-mounted vacuum circuit breaker

Abstract

This invention discloses a skid-free, side-mounted vacuum circuit breaker, comprising a vacuum interrupter and an operating mechanism. The vacuum interrupter is mounted behind the operating mechanism via an insulating base and is linked to the operating mechanism. The operating mechanism includes a housing and a manual energy storage component, a central shaft assembly, and a main tension spring installed within the housing. The central shaft assembly is rotatably connected to the housing, and one end of the main tension spring is connected to a crank at one end of the central shaft assembly. The manual energy storage component includes a handle and a drive shaft, which is rotatably connected to the housing, and a reduction gear on the drive shaft meshes with an intermediate gear on the central shaft assembly. The tooth width of the reduction gear is greater than that of the intermediate gear, and the drive shaft and the reduction gear are axially movable. This invention eliminates the need for specialized tools, saving maintenance personnel the tedious work of preparing and carrying such tools.

Description

Technical Field

[0001] This invention belongs to the field of vacuum circuit breaker technology, specifically relating to a skid-free side-mounted vacuum circuit breaker. Background Technology

[0002] Side-mounted vacuum circuit breakers are mainly used in locations with special requirements for switchgear space layout, such as miniaturized switchgear like air-insulated ring main units. They are commonly used in power plants, industrial and mining enterprises, power distribution, and substations in power systems for the control and protection of power transformation, transmission, and motor voltage transformation. Unlike ordinary vacuum circuit breakers, side-mounted vacuum circuit breakers are installed from the side, with a longitudinally arranged internal structure and compact internal components, ensuring sufficient electrical clearance between phases and to ground within a very small width.

[0003] Existing side-mounted vacuum circuit breakers mostly adopt a modular design, which mainly consists of a vacuum interrupter, an operating mechanism, and a conductive circuit. The operating mechanism is installed in the enclosure and includes components such as a tripping knob, a closing knob, a stop device, an energy storage indicator, manual energy storage, electric energy storage, and tripping / closing indicators. The specific structures of electric and manual energy storage are as follows: Electric energy storage: The motor drives the intermediate gear to rotate through a two-stage reduction gear set. One end of the central shaft of the intermediate gear is equipped with a crank. The crank swings eccentrically to pull the main tension spring to store energy. After being in the energy storage state, the main tension spring is kept in the tension state by a stop device. It is triggered by the opening or closing knob. The transmission shaft of the two-stage reduction gear set is equipped with a first one-way bearing.

[0004] Manual energy storage: The handle drives a first-stage reduction gear to rotate via another drive shaft. The first-stage reduction gear meshes with the intermediate gear, which in turn drives the main tension spring to store energy. The drive shaft is also equipped with a first one-way bearing.

[0005] The aforementioned electric and manual energy storage systems share a common intermediate gear, both of which drive the main tension spring to extend via gear transmission. If the operating mechanism malfunctions, the spring must be disassembled to release pressure, preventing the elastic potential energy from causing the gears to rotate and resulting in accidents. Because the main tension spring has a relatively large diameter, special tools (main tension spring pry bar, lever, main tension spring limiter, etc.) are required for both disassembly and assembly. The specific operation is as follows: For the front cover of the housing, one person first uses the main tension spring limiter to wrap around the main tension spring to prevent it from being released suddenly during disassembly and causing accidents. Then, the upper and lower ends of the main tension spring pry bar are secured to the upper and lower sides of the front opening of the housing, and another pry bar on the main tension spring pry bar is used to pry the lower end of the main tension spring. Next, a lever is placed on the end of the pry bar, and the lever is pushed upwards to pry the lower end of the main tension spring downwards. The lower end of the main tension spring loses stress due to being pried open. Another person then separates the retainer on the crank to release the lower end of the main tension spring, slowly releasing the lever to release the tension of the main tension spring. With the two people working together, disassembly is completed. The assembly and disassembly of the main tension spring also require the use of the aforementioned special tools.

[0006] As can be seen from the above main tension spring disassembly and assembly operations, if the operating mechanism of a side-mounted vacuum circuit breaker malfunctions, most repairs involve disassembling and assembling the main tension spring. However, disassembling the main tension spring requires two people working together and using specialized tools. If conventional tools are used to forcibly disassemble and assemble it, equipment failure is likely to occur, and personnel safety cannot be guaranteed. Therefore, there is currently a lack of a side-mounted vacuum circuit breaker that facilitates the disassembly of the main tension spring. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a skid-free, side-mounted vacuum circuit breaker, comprising a vacuum interrupter and an operating mechanism. The vacuum interrupter is mounted behind the operating mechanism via an insulating base, and the vacuum interrupter is linked to the operating mechanism. The operating mechanism includes a housing and a manual energy storage component, a central shaft assembly, and a main tension spring installed within the housing. The central shaft assembly is rotatably connected to the housing, and one end of the main tension spring is connected to a crank at one end of the central shaft assembly. The manual energy storage component includes a handle and a drive shaft, which is rotatably connected to the housing, and the reduction gear of the drive shaft is connected to the central shaft assembly. The intermediate gear of the shaft assembly is engaged; the tooth width of the reduction gear is greater than that of the intermediate gear, and the drive shaft and the reduction gear can move axially; the handle is sleeved on the right end of the drive shaft through a first one-way bearing, the inner ring of the first one-way bearing has a ring of tooth grooves, and the drive shaft has a first gear tooth that matches the ring of tooth grooves; the drive shaft has a rotatable inner shaft inside, the left end of the inner shaft extends out of the drive shaft and is detachably connected to the lower end of the main tension spring through a traction line, the right end of the inner shaft extends out of the drive shaft and is sleeved with a second gear tooth that matches the tooth groove of the inner ring of the first one-way bearing, and there is a gap between the first gear tooth and the second gear tooth.

[0008] The preferred embodiment of the skid-free side-mounted vacuum circuit breaker in this invention is as follows: the drive shaft is rotatably connected to two parallel mounting plates inside the housing via a bushing, and the drive shaft can move relative to the bushing; the inner shaft is rotatably connected to the drive shaft via a ball bearing. The part of the drive shaft that contacts the bushing is a smooth shaft, and the frictional resistance between the smooth shaft and the bushing is small. The drive shaft can rotate and move axially relative to the bushing, meeting the requirements of both manual energy storage and the disassembly and assembly of the main tension spring.

[0009] The preferred embodiment of the pry-free side-mounted vacuum circuit breaker in this invention is as follows: A transverse spring pin is provided on the side of the handle, and one of the two mounting plates has a limiting hole corresponding to the spring pin. By rotating the handle to its maximum angle, the spring pin is engaged in the limiting hole. If manual energy storage is used, the handle cannot be pressed down to its maximum angle each time to prevent the spring pin from engaging in the limiting hole. If the main tension spring is disassembled, the handle must be pressed down to its maximum angle, and the spring pin is used to lock it in place, preventing the handle from returning to its original position under the tension of the main tension spring.

[0010] The preferred embodiment of the skid-free side-mounted vacuum circuit breaker in this invention is as follows: the drive shaft is fitted with a reset spring and a rotatable rotating ring; the drive shaft has an annular groove, and the rotating ring is rotatably connected within the annular groove; one end of the reset spring is fixed to one of the mounting plates, and the other end is fixedly connected to the rotating ring, with the tension of the reset spring extending to the right along the drive shaft; the drive shaft has a limiting ring located on the left side of the mounting plate. Since the drive shaft can move axially, the reset spring keeps the drive shaft to the right when not under maintenance, and the drive shaft remains connected to the handle, thus the inner shaft structure does not affect manual energy storage operation.

[0011] A preferred embodiment of the skid-free side-mounted vacuum circuit breaker of this invention is as follows: the crank is provided with a retainer for fixing the main tension spring, and the retainer has a mounting hole adapted to the lower end of the main tension spring; the retainer can move axially relative to the crank. Further, the left end of the inner shaft is provided with a notch and a nut for securing the traction cable, and the lower end of the traction cable is provided with a retaining ring adapted to the notch, and a separator is provided in the middle of the traction cable. The upper end of the traction cable is fitted onto the lower end of the main tension spring. The retaining ring can be engaged in the notch and the nut tightened to prevent the retaining ring from slipping out of the notch. The retaining ring can rotate synchronously with the rotation of the inner shaft. The connection method between the traction cable and the main tension spring, and the connection method between the traction cable and the inner shaft, have a simple connection structure, which facilitates the simplification of spring disassembly.

[0012] The preferred embodiment of the skid-free side-mounted vacuum circuit breaker in this invention is as follows: the separator includes a male connector and a female connector that are mated together, and the male connector and the female connector are locked together by a transverse locking pin.

[0013] The advantages of the skid-free side-mounted vacuum circuit breaker in this invention are as follows: 1. The operating mechanism has a built-in structure for disassembling and assembling the main tension spring, eliminating the need for special tools and saving maintenance personnel the tedious work of organizing and carrying special tools.

[0014] 2. Compared to the existing main tension spring disassembly process, only one person is needed to complete the disassembly, without the need for two people to cooperate, making the disassembly process easier.

[0015] This invention also provides a method for removing the main tension spring of a side-mounted vacuum circuit breaker, based on the above-mentioned pry-free side-mounted vacuum circuit breaker, comprising the following steps: First, disconnect the power. Open the front cover of the housing, then push the drive shaft to the left. The inner ring of the first one-way bearing separates from the first gear tooth of the drive shaft. Continue pushing the drive shaft to the left, and the inner ring of the first one-way bearing meshes with the second gear tooth of the inner shaft. Then, engage the retaining ring at the lower end of the traction line with the notch, tighten the nut, and swing the handle downwards to its maximum angle. The spring pin engages in the limiting hole, locking the handle and preventing further swinging. During the downward swinging of the handle, the handle drives the inner shaft to rotate through the first one-way bearing. The traction line is positioned at the left end of the inner shaft, and simultaneously, the traction line pulls the main tension spring to extend. Remove the cotter pin at the lower end of the main tension spring, and move the retainer to the left until the lower end of the main tension spring exits the mounting hole. Finally, pull out the locking pin, the separator in the middle of the traction line separates, releasing the tension of the main tension spring, and disassemble the main tension spring.

[0016] The main tension spring disassembly method for side-mounted vacuum circuit breakers in this invention has the following advantages: each step in the entire disassembly process is fixed and has a specific sequence, forming a fixed and dedicated disassembly method. This facilitates the standardization of maintenance methods for side-mounted vacuum circuit breakers, minimizes equipment failures caused by incorrect maintenance methods, and enhances the safety awareness of maintenance personnel. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the internal structure of a side-mounted vacuum circuit breaker in the background art.

[0019] Figure 2 This is a schematic diagram of the internal structure of the skid-free side-mounted vacuum circuit breaker in this embodiment. Figure 1 .

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 for Figure 3 A schematic diagram showing the retaining ring fixed to the inner shaft after the inner shaft moves to the left.

[0022] Figure 5 This is a schematic diagram of the internal structure of the skid-free side-mounted vacuum circuit breaker in this embodiment. Figure 2 .

[0023] Figure 6 for Figure 5 A diagram showing the handle swinging down to its maximum angle after the inner shaft moves to the left.

[0024] Figure 7 for Figure 5 Enlarged view of point B in the middle.

[0025] Figure 8 This is a schematic diagram of the transmission shaft in this embodiment.

[0026] Reference numerals: 1. Vacuum interrupter chamber; 2. Operating mechanism; 3. Insulating base; 4. Housing; 5. Manual energy storage assembly; 6. Central shaft assembly; 7. Main tension spring; 8. Electric energy storage assembly; 9. Crank; 10. Fixing device; 11. Mounting hole; 12. Handle; 13. Drive shaft; 14. Bushing; 15. Mounting plate; 16. Intermediate gear; 17. Reduction gear; 18. First one-way bearing; 19. Inner ring; 20. Inner shaft; 21. Second gear tooth; 22. Hole; 23. Notch; 24. Nut; 25. Separator; 26. Male connector; 27. Female connector; 28. Locking pin; 29. ​​Spring pin; 30. Limiting hole; 31. Cotter pin; 32. Third gear tooth; 33. Return tension spring; 34. Rotating ring; 35. Annular groove; 36. Fixing tube; 37. Traction line; 38. Snap ring; 39. Gear groove; 40. First gear tooth; 41. Second one-way bearing. Detailed Implementation

[0027] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0028] like Figure 2 As shown, this embodiment provides a skid-free side-mounted vacuum circuit breaker, including a vacuum interrupter 1 and an operating mechanism 2. The vacuum interrupter 1 is mounted behind the operating mechanism 2 via an insulating base 3, and the vacuum interrupter 1 is linked to the operating mechanism 2. Typically, there is more than one vacuum interrupter 1, usually three or more, all of which are arranged in a straight line and sequentially mounted on the insulating base 3, directly behind the operating mechanism 2.

[0029] The specific structure of operating mechanism 2 is as follows: like Figure 2 and Figure 5 As shown, the operating mechanism 2 includes a housing 4 and a manual energy storage component 5, a central shaft assembly 6, and a main tension spring 7 installed inside the housing 4. The operating mechanism 2 also includes an electric energy storage component 8, a tripping knob, a closing knob, and a stopper. The stopper's function is to lock the central shaft assembly 6 after it rotates in one direction during the energy storage process, preventing it from rotating in the opposite direction. Since the electric energy storage component 8, the tripping knob, the closing knob, and the stopper are all existing structures, they will not be described in detail in this embodiment. The central shaft assembly 6 is rotatably connected inside the housing 4. The lower end of the main tension spring 7 is connected to a crank 9 at one end of the central shaft assembly 6. Specifically, the crank 9 is provided with a retainer 10 for fixing the main tension spring 7, and the retainer 10 is provided with a mounting hole 11 that matches the lower end of the main tension spring 7. The retainer 10 can move axially relative to the crank 9, while the upper end of the main tension spring 7 is connected to a fixed shaft inside the housing 4.

[0030] The manual energy storage component 5 in this embodiment includes a handle 12 and a drive shaft 13. The drive shaft 13 is rotatably connected inside the housing 4. Specifically, the drive shaft 13 is rotatably connected to two parallel mounting plates 15 inside the housing 4 via a bushing 14, and the drive shaft 13 can move relative to the bushing 14. The part of the drive shaft 13 that contacts the bushing 14 is a smooth shaft. The frictional resistance between the smooth shaft and the bushing 14 is small, allowing the drive shaft 13 to rotate and move axially relative to the bushing 14. The reduction gear 17 of the drive shaft 13 meshes with the intermediate gear 16 of the central shaft assembly 6. The tooth width of the reduction gear 17 is larger than the tooth width of the intermediate gear 16, and the drive shaft 13 and the reduction gear 17 can move axially. During the axial movement of the drive shaft 13, the reduction gear 17 always maintains a meshing relationship with the intermediate gear 16, and the two do not separate. Figure 7As shown, the handle 12 is fitted onto the right end of the drive shaft 13 via a first one-way bearing 18. The inner ring 19 of the first one-way bearing 18 has a ring of toothed grooves 39, and the drive shaft 13 has a first gear tooth 40 that matches the ring of toothed grooves 39. Since the drive shaft 13 can move axially, the first gear tooth 40 of the drive shaft 13 can engage or disengage axially with the ring of toothed grooves 39 of the inner ring 19. The function of the first one-way bearing 18 is to allow the handle 12 to drive the drive shaft 13 to rotate, while the drive shaft 13 cannot drive the handle 12 to rotate, thus forming a one-way transmission relationship. The specific connection relationship between the first one-way bearing 18 and the handle 12 is as follows: the outer ring of the first one-way bearing 18 is fixed to the handle 12, while the outer ring, inner ring 19, roller, and roller spring of the first one-way bearing 18 are assembled into a whole, with only the inner ring 19 engaging or disengaging with the first gear tooth 40 of the drive shaft 13. If the handle 12 needs to drive the drive shaft 13 to rotate, with the inner ring 19 and the first gear 40 of the drive shaft 13 in engagement, simply swing the handle 12 downwards. During this process, the roller will lock onto the inclined surface of the inner ring 19, preventing the inner ring 19 and the outer ring from rotating relative to each other. Therefore, the handle 12 and the drive shaft 13 will not rotate relative to each other, and the downward swing of the handle 12 will drive the drive shaft 13 to rotate synchronously. However, during the upward swing of the handle 12, the roller spring pushes the roller to reset and unlock it from the inclined surface of the inner ring 19, allowing the inner ring 19 and the outer ring to rotate relative to each other. Therefore, the upward swing of the handle 12 will not drive the drive shaft 13 to rotate synchronously. This principle utilizes the unidirectional transmission principle of the first one-way bearing 18.

[0031] To replace existing dedicated spring disassembly tools, this embodiment includes a rotatable inner shaft 20 inside the drive shaft 13. The drive shaft 13 and the inner shaft 20 are rotatably connected by ball bearings, and there is no axial movement between the drive shaft 13 and the inner shaft 20. Figure 7 As shown, the left end of the inner shaft 20 extends out of the drive shaft 13 and is detachably connected to the lower end of the main tension spring 7 via a traction line 37. The right end of the inner shaft 20 extends out of the drive shaft 13 and is fitted with a second gear 21 that matches the tooth groove 39 of the inner ring 19 of the first one-way bearing 18. A gap 22 is provided between the first gear 40 and the second gear 21. All teeth of the second gear 21 are aligned with all teeth of the first gear 40, allowing the inner ring 19 to move freely back and forth between the second gear 21 and the first gear 40 along the axial direction.

[0032] Furthermore, such as Figure 3 and Figure 4As shown, the inner shaft 20 has a notch 23 and a nut 24 at its left end for securing the traction line 37. The lower end of the traction line 37 has a retaining ring 38 that matches the notch 23, and a separator 25 is located in the middle of the traction line 37. The upper end of the traction line 37 is fitted onto the lower end of the main tension spring 7. The retaining ring 38 can be engaged in the notch 23, and the nut 24 can be tightened to prevent the retaining ring 38 from slipping out of the notch 23. The retaining ring 38 can rotate synchronously with the inner shaft 20. The separator 25 includes a male connector 26 and a female connector 27 that are mated together. After mating, the male connector 26 and the female connector 27 are locked by a transverse locking pin 28.

[0033] like Figure 5 and Figure 6 As shown, a horizontal spring pin 29 is provided on the side of the handle 12. One of the two mounting plates 15 is provided with a limiting hole 30 corresponding to the spring pin 29. By rotating the handle 12 to the maximum angle, the spring pin 29 is inserted into the limiting hole 30. This limiting function can be used to disassemble and assemble the main tension spring 7, making disassembly and assembly convenient.

[0034] This embodiment also provides a method for disassembling the main tension spring 7 of a side-mounted vacuum circuit breaker: First, disconnect the power. Open the front cover of the housing 4, then push the drive shaft 13 to the left. The drive shaft 13 and the inner shaft 20 move axially synchronously. Because there is a gap 22 between the first gear 40 and the second gear 21, the inner ring 19 of the first one-way bearing 18 separates from the first gear 40 of the drive shaft 13. Continue to push the drive shaft 13 to the left, and the inner ring 19 of the first one-way bearing 18 meshes with the second gear 21 of the inner shaft 20. Then, the retaining ring 38 at the lower end of the traction line 37 is inserted into the notch 23, and the nut 24 is tightened. Then, the handle 12 is swung down to the maximum angle. At the same time, the traction line 37 pulls down to extend the main tension spring 7. Because the inner shaft 20 can rotate freely in the drive shaft 13, in order to prevent the main tension spring 7 from driving the inner shaft 20 to reset, the spring pin 29 needs to be inserted into the limiting hole 30. After the handle 12 is locked, the main tension spring 7 is kept in the extended state. After the first one-way bearing 18 and the main tension spring 7 extend, the main tension spring 7 and the retainer 10 are released. Remove the cotter pin 31 at the lower end of the main tension spring 7, and move the retainer 10 to the left until the lower end of the main tension spring 7 exits from the mounting hole 11. Finally, pull out the locking pin 28, the separator 25 in the middle of the traction line 37 separates, the tension of the main tension spring 7 is released, and the main tension spring 7 is disassembled.

[0035] The installation method for the main tension spring 7 is as follows: Since the tension of the main tension spring 7 is completely released, a longer traction cable 37 needs to be selected and fitted onto the lower end of the main tension spring 7. The lower end of the traction cable 37 is also secured in the notch 23 by the retaining ring 38. Then, press down the handle 12, but not to the maximum angle. Here, the handle 12 needs to be pressed down multiple times. The traction cable 37 slowly winds around the inner shaft 20, continuously pulling the main tension spring 7 to extend until the lower end of the main tension spring 7 is pulled to the mounting hole 11. Finally, move the retainer 10 to the right, and the lower end of the main tension spring 7 passes through the mounting hole 11. Insert the cotter pin 31, and the installation of the main tension spring 7 is completed.

[0036] During the installation process described above, each time the handle 12 is pressed down, it is necessary to prevent the traction cable 37 from resetting under the tension of the main tension spring 7. The specific structure for preventing resetting is as follows: a second one-way bearing 41 is provided near the left end of the inner shaft 20, and a fixing tube 36 adapted to the outer ring of the second one-way bearing 41 is provided on one side of one of the mounting plates 15. The second one-way bearing 41 is the same as the first one-way bearing 18 in that its inner ring 19 is provided with a toothed groove 39. Correspondingly, a third gear 32 adapted to the toothed groove 39 of the second one-way bearing 41 is provided on the inner surface of the inner shaft 20. The third gear 32 and the toothed groove 39 of the second one-way bearing 41 can move axially relative to each other, and the third gear 32 can selectively engage or disengage from the second one-way bearing 41 as needed. For example, when the drive shaft 13 is pushed to the left, the inner ring 19 of the first one-way bearing 18 meshes with the second gear 21 of the inner shaft 20, and at the same time the third gear 32 meshes with the inner ring 19 of the second one-way bearing 41. However, the inner ring 19 of the second one-way bearing 41 only allows the inner shaft 20 to rotate in the direction of tightening the traction line 37. That is, the inner shaft 20 cannot rotate in the opposite direction under the tension of the main tension spring 7. As a result, the part of the traction line 37 wrapped on the inner shaft 20 will not be reset and loosened after each press of the handle 12.

[0037] After installation, in order to automatically reset the drive shaft 13, as follows: Figure 2 and Figure 8 As shown, a return spring 33 and a rotatable rotating ring 34 are fitted onto the drive shaft 13. The drive shaft 13 has an annular groove 35, and the rotating ring 34 is rotatably connected within the annular groove 35. One end of the return spring 33 is fixed to one of the mounting plates 15, and the other end is fixedly connected to the rotating ring 34. The tension of the return spring is directed to the right along the drive shaft 13. The drive shaft 13 has a limiting ring located on the left side of the mounting plate 15. Since the drive shaft 13 can move axially, the return spring keeps the drive shaft 13 to the right when not under maintenance. The inner ring 19 of the first one-way bearing 18 separates from the second gear 21 of the inner shaft 20, and the third gear 32 also separates from the inner ring 19 of the second one-way bearing 41. At the same time, the first gear 40 of the drive shaft 13 meshes with the inner ring 19 of the first one-way bearing 18. That is, the drive shaft 13 and the handle 12 are in a transmission connection state. Therefore, the structure of the inner shaft 20 does not affect the manual energy storage operation.

[0038] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A skid-free side-mounted vacuum circuit breaker, comprising a vacuum interrupter and an operating mechanism, wherein the vacuum interrupter is mounted behind the operating mechanism via an insulating base, and the vacuum interrupter is linked to the operating mechanism; Its features are: The operating mechanism includes a housing and a manual energy storage component, a central shaft assembly, and a main tension spring installed inside the housing; the central shaft assembly is rotatably connected to the housing, and one end of the main tension spring is connected to a crank at one end of the central shaft assembly. The manual energy storage assembly includes a handle and a drive shaft. The drive shaft is rotatably connected to the housing, and the reduction gear of the drive shaft meshes with the intermediate gear of the central shaft assembly. The tooth width of the reduction gear is greater than that of the intermediate gear, and the drive shaft and the reduction gear are axially movable. The handle is sleeved on the right end of the drive shaft through a first one-way bearing. The inner ring of the first one-way bearing has a ring of tooth grooves, and the drive shaft has a first gear tooth that matches the ring of tooth grooves. The drive shaft has a rotatable inner shaft inside. The left end of the inner shaft extends out of the drive shaft and is detachably connected to the lower end of the main tension spring through a traction line. The right end of the inner shaft extends out of the drive shaft and has a second gear tooth that matches the tooth groove of the inner ring of the first one-way bearing. There is a gap between the first gear tooth and the second gear tooth, and the first gear tooth and the second gear tooth are axially movable relative to the inner ring of the first one-way bearing.

2. The skid-free side-mounted vacuum circuit breaker according to claim 1, characterized in that: The drive shaft is rotatably connected to two parallel mounting plates inside the housing via a bushing, and the drive shaft can move relative to the bushing; the inner shaft is rotatably connected to the drive shaft via a ball bearing.

3. A skid-free side-mounted vacuum circuit breaker according to claim 2, characterized in that: The handle has a horizontal spring pin on its side, and one of the two mounting plates has a limiting hole corresponding to the spring pin. By rotating the handle to the maximum angle, the spring pin is engaged in the limiting hole.

4. A skid-free side-mounted vacuum circuit breaker according to claim 3, characterized in that: The drive shaft is fitted with a reset spring and a rotatable rotating ring. The drive shaft has an annular groove, and the rotating ring is rotatably connected within the annular groove. One end of the reset spring is fixed to one of the mounting plates, and the other end is fixedly connected to the rotating ring. The tension of the reset spring is directed to the right along the drive shaft. The drive shaft is provided with a limiting ring located on the left side of the mounting plate.

5. A skid-free side-mounted vacuum circuit breaker according to claim 4, characterized in that: The crank is provided with a retainer for fixing the main tension spring, and the retainer is provided with a mounting hole adapted to the lower end of the main tension spring; the retainer is movable relative to the crank axis.

6. A skid-free side-mounted vacuum circuit breaker according to claim 5, characterized in that: The left end of the inner shaft is provided with a notch and a nut for locking the traction line, and the lower end of the traction line is provided with a retaining ring that matches the notch, and the middle of the traction line is provided with a separator.

7. A skid-free side-mounted vacuum circuit breaker according to claim 6, characterized in that: The separator includes a male connector and a female connector that are mated together, and the male connector and the female connector are locked together by a transverse locking pin.

8. A method for disassembling the main tension spring of a side-mounted vacuum circuit breaker, characterized in that: Based on the skid-free side-mounted vacuum circuit breaker according to claim 7, the steps are as follows: S1. Power off, open the front cover of the enclosure; S2. Push the drive shaft to the left, and the inner ring of the first one-way bearing separates from the first gear tooth of the drive shaft. Continue to push the drive shaft to the left, and the inner ring of the first one-way bearing meshes with the second gear tooth of the inner shaft. S3. Secure the retaining ring at the lower end of the traction line into the notch and tighten the nut; S4. Swing the handle down to its maximum angle, the spring pin engages with the limit hole, the handle locks, and it cannot be swung. S5. In step S4, the handle drives the inner shaft to rotate through the first one-way bearing. The traction line is set at the left end of the inner shaft. At the same time, the traction line pulls the main tension spring to extend. The cotter pin at the lower end of the main tension spring is removed. The retainer is moved to the left until the lower end of the main tension spring is removed from the mounting hole. S6. Pull out the locking pin, the separator in the middle of the traction line separates, and the main tension spring is released; S7. Remove the main tension spring.

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