Spring operating mechanism of low-frequency circuit breaker

Abstract

The invention belongs to the technical field of circuit breakers, and particularly relates to a spring operating mechanism of a low-frequency circuit breaker. The device comprises a mounting frame; the main shaft is rotationally connected to the mounting frame, and a closing energy storage output arm is arranged on the main shaft; energy stored by the closing energy storage spring can drive the energy storage shaft and the closing cam to rotate in a second direction and push the closing energy storage output arm to rotate in a first direction through rotation of the closing cam, so that the main shaft is driven to rotate in the first direction; a closing switch; an opening energy storage spring; the closing maintaining assembly is used for limiting the main shaft to rotate towards the second direction in a closing state; and an opening switch. The control precision of the opening switch and the closing switch on opening and closing is high, springback is not prone to occurring, the situation of opening and closing failure is avoided, and opening and closing can be accurately achieved; energy storage of opening and closing is performed through the opening energy storage spring and the closing energy storage spring, and energy storage maintenance is performed in advance in cooperation with the closing switch and the opening maintenance assembly, so that the opening and closing efficiency is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit breakers, and particularly relates to a spring operating mechanism for a low-frequency circuit breaker. Background Art

[0002] With the gradual development of offshore wind power resources, offshore wind power technology has started to develop towards medium and long-distance targets. However, there are some challenges in the transmission of medium and long-distance offshore wind power using existing flexible DC transmission technology, including difficulties in fault interruption and large transmission losses.

[0003] To solve these problems, low-frequency power transmission technology has emerged. It uses a 20-hertz low-frequency AC power transmission method, which can effectively improve the transmission capacity of submarine cables and has flexible control functions such as power control, voltage dynamic adjustment, and asynchronous grid interconnection.

[0004] As a key device in the low-frequency power transmission system, the low-frequency circuit breaker can efficiently connect and disconnect the power circuit, and at the same time, when a short-circuit problem occurs, it can quickly and safely cut off the power. The reliability of its operation is of great significance for promoting the development of offshore wind power technology.

[0005] The operating mechanism is the executive component of the circuit breaker and the core of the entire circuit breaker. It is responsible for providing the energy required for the opening and closing operations of the circuit breaker and performing the opening and closing operations. In the existing circuit breakers, there will be violent mechanical movements during opening and closing, which will pull the moving contact of the arc extinguishing chamber to the limit position. The high-speed movement will cause a violent impact and rebound. The rebound will cause the opening distance of the contact to decrease, resulting in a decrease in the compressive resistance of the contact and even failure of the opening and closing operations. Summary of the Invention

[0006] In view of the above problems existing in the prior art, the present invention provides a spring operating mechanism for a low-frequency circuit breaker, which can prevent the situation of opening and closing failure caused by rebound during opening and closing operations.

[0007] To achieve the above object, the technical solution provided by the present invention is as follows:

[0008] The present application provides a spring operating mechanism for a low-frequency circuit breaker, including:

[0009] An installation frame;

[0010] A main shaft, rotatably connected to the installation frame. When the main shaft rotates in the first direction, it can drive the control end of the link mechanism to lift, completing the closing operation. When the main shaft rotates in the second direction, it can drive the control end of the link mechanism to move downward, completing the opening operation. A closing energy storage output arm is provided on the main shaft;

[0011] Closing energy storage spring, a energy storage shaft is rotatably connected to the mounting bracket. One end of the closing energy storage spring is fixed, and the other end is connected to the energy storage shaft through an energy storage crank arm. The rotation of the energy storage shaft can stretch the closing energy storage spring for energy storage, and the energy storage shaft is driven to rotate by a driving member; a closing cam is arranged on the energy storage shaft. The energy stored in the closing energy storage spring can drive the energy storage shaft and the closing cam to rotate in the second direction and push the closing energy output arm to rotate in the first direction through the rotation of the closing cam, thereby driving the main shaft to rotate in the first direction;

[0012] Closing switch, used to limit the rotation of the energy storage shaft through the closing cam. When the closing switch is not opened, the rotation of the closing cam in the second direction is blocked. When the closing switch is opened, the closing cam and the energy storage shaft can rotate in the second direction driven by the stored energy;

[0013] Tripping energy storage spring, one end of the tripping energy storage spring is fixed on the mounting bracket, and the other end is connected to the linkage mechanism. When closing is completed, the tripping energy storage spring is stretched, and the tripping energy storage spring is in an energy storage state. The energy stored in the tripping energy storage spring can drive the control end of the linkage mechanism to move downward and the main shaft to rotate in the second direction;

[0014] Closing holding assembly, used to limit the rotation of the main shaft in the second direction in the closed state;

[0015] Tripping switch, used to release the restriction of the closing holding assembly on the rotation of the main shaft in the second direction.

[0016] Optionally, the closing holding assembly includes a tripping catch plate, a locking catch plate, a torsion spring and a closing holding half shaft rotatably connected to the mounting bracket. The middle of the tripping catch plate is rotatably connected to the mounting bracket through a rotating shaft. A tripping transmission arm is arranged on the main shaft, and a sliding groove is arranged on the tripping transmission arm. One end of the locking catch plate is hinged to the end of the tripping catch plate away from the closing holding half shaft, and the other end is slidably connected to the sliding groove of the tripping transmission arm; the spring coil of the torsion spring is sleeved on the rotating shaft. One end of the torsion spring is pressed against the side wall of the tripping catch plate facing the closing holding half shaft, and the other end of the torsion spring is pressed against the side wall of the locking catch plate facing the main shaft; a limiting rod is arranged on the mounting bracket, and the tripping catch plate is arranged between the limiting rod and the closing holding half shaft. The limiting rod is used to limit the rotation of the tripping catch plate in the first direction;

[0017] A second limiting groove is arranged on the closing holding half shaft. The limiting groove is used to limit the rotation of the tripping catch plate in the second direction. The tripping switch is used to drive the closing holding half shaft to rotate so that the second limiting groove releases the limit on the tripping catch plate.

[0018] Optionally, the tripping switch includes a tripping button slidably connected to the mounting plate. A tripping crank arm is connected to the closing holding half shaft, and the sliding of the tripping button can push the tripping crank arm to rotate.

[0019] Optionally, the closing switch includes a first retaining half shaft rotatably connected to the mounting bracket, a closing pawl rotatably connected to the mounting bracket, a closing crank arm, and a closing driving portion for driving the closing crank arm to rotate. The closing crank arm is connected to the first retaining half shaft. A first limiting groove is provided on the first retaining half shaft for limiting the closing pawl. When the closing driving portion is not activated, the first limiting groove blocks the closing pawl from rotating in the second direction, and the closing pawl blocks the closing cam from rotating in the second direction. When the closing driving portion is activated, the first limiting groove releases the limitation on the closing cam by limiting the closing pawl through contact.

[0020] Optionally, the closing driving portion includes a closing button slidably connected to the mounting plate, and the closing button can slide to push the closing crank arm to rotate.

[0021] Optionally, the link mechanism includes a transmission arm, a first arm, and a second arm. The transmission arm is fixed to the main shaft. One end of the first arm is hinged to the end of the transmission arm away from the main shaft, and the other end is hinged to the second arm. The middle of the second arm is hinged to the mounting bracket through a rotating shaft, and the end of the second arm away from the first arm is the control end.

[0022] Optionally, the driving member includes a driving gear provided on the energy storage shaft, and a motor is provided on the mounting bracket for driving the gear to rotate.

[0023] Optionally, a buffer arm is provided on the main shaft, and an oil buffer is provided on the mounting bracket. A collision head is provided at the top of the oil buffer. When the main shaft rotates, the buffer arm can strike the collision head.

[0024] Optionally, the first direction and the second reverse direction are opposite directions.

[0025] Optionally, there are two closing energy storage springs, and the two closing energy storage springs are respectively arranged at both ends of the energy storage shaft.

[0026] Compared with the prior art, the present application has at least the following beneficial effects:

[0027] In the present invention, the opening switch and the closing switch have high control accuracy for opening and closing, are not prone to rebound, avoid the situation of opening and closing failure, and can accurately achieve opening and closing; the opening and closing energy storage is carried out through the opening energy storage spring and the closing energy storage spring, and is combined with the closing switch and the opening holding assembly to pre-store and hold the energy, effectively improving the opening and closing efficiency.

[0028] By providing an oil buffer, through the collision between the buffer arm and the collision head, effective buffering can be carried out to reduce vibration. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of a low-frequency circuit breaker spring operating mechanism in an embodiment of the present application;

[0031] Figure 2 Structural schematic diagram for reflecting the connection relationship between the closing cam and the closing pawl in an embodiment of the present application;

[0032] Figure 3 Schematic diagram for reflecting the structure of the closing holding assembly in an embodiment of the present application;

[0033] Figure 4 Structural schematic diagram for reflecting the connection relationship between the opening energy storage spring and the link mechanism in an embodiment of the present application;

[0034] Explanation of reference numerals:

[0035] 1. Mounting frame; 2. Main shaft; 21. Closing energy storage output arm; 22. Opening transmission arm; 3. Link mechanism; 31. Control end; 32. Transmission arm; 33. First arm; 34. Second arm; 35. Mounting hole; 36. Hinge part; 4. Closing energy storage spring; 5. Energy storage shaft; 51. Energy storage crank arm; 52. Driving part; 53. Closing cam; 54. Driving gear; 6. Closing switch; 61. First holding half shaft; 611. Closing crank arm; 612. Closing driving part; 613. First limiting groove; 62. Closing pawl; 7. Opening energy storage spring; 8. Closing holding assembly; 81. Opening catch plate; 811. Rotating shaft; 82. Lock catch plate; 83. Torsion spring; 84. Closing holding half shaft; 841. Second limiting groove; 85. Limiting rod; 86. Opening crank arm; 9. Opening switch; 91. Opening button; 10. Oil buffer; 101. Impact head. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use.

[0037] Embodiment 1

[0038] As Figures 1-4As shown in the figure, a spring operating mechanism for a low-frequency circuit breaker includes:

[0039] Mounting frame 1;

[0040] Main shaft 2, which is rotatably connected to the mounting frame 1. When the main shaft 2 rotates in the first direction, it can drive the control end 31 of the link mechanism 3 to lift, completing the closing operation. When the main shaft 2 rotates in the second direction, it can drive the control end 31 of the link mechanism 3 to move downward, completing the opening operation. A closing energy storage output arm 21 is provided on the main shaft 2;

[0041] Closing energy storage spring 4. A storage shaft 5 is rotatably connected to the mounting frame 1. One end of the closing energy storage spring 4 is fixed, and the other end is connected to the storage shaft 5 through a storage crank arm 51. When the storage shaft 5 rotates, it can stretch the closing energy storage spring 4 for energy storage. The storage shaft 5 is driven to rotate by a driving member 52; A closing cam 53 is provided on the storage shaft 5. The energy stored in the closing energy storage spring 4 can drive the storage shaft 5 and the closing cam 53 to rotate in the second direction and push the closing energy storage output arm 21 to rotate in the first direction through the rotation of the closing cam 53, thereby driving the main shaft 2 to rotate in the first direction;

[0042] Closing switch 6, which is used to limit the rotation of the storage shaft 5 through the closing cam 53. When the closing switch 6 is not opened, the rotation of the closing cam 53 in the second direction is blocked. When the closing switch 6 is opened, the closing cam 53 and the storage shaft 5 can rotate in the second direction under the drive of the stored energy;

[0043] Opening energy storage spring 7. One end of the opening energy storage spring 7 is fixed on the mounting frame 1, and the other end is connected to the link mechanism 3. When the closing operation is completed, the opening energy storage spring 7 is stretched, and the opening energy storage spring 7 is in an energy storage state. The energy stored in the opening spring can drive the control end 31 of the link mechanism 3 to move downward and the main shaft 2 to rotate in the second direction;

[0044] Closing holding component 8, which is used to limit the rotation of the main shaft 2 in the second direction in the closing state;

[0045] Opening switch 9, which is used to release the restriction of the closing holding component 8 on the rotation of the main shaft 2 in the second direction.

[0046] When the closing energy storage spring 4 is not energized, the driving member 52 is powered on, driving the storage shaft 5 to rotate in the second direction (counterclockwise in the left view), synchronously driving the storage crank arm 51 to rotate, and stretching the closing energy storage spring 4 to make the closing energy storage spring 4 reach the energy storage state; And synchronously drive the closing cam 53 to rotate a certain angle in the second direction until its continuous rotation in the second direction is blocked;

[0047] When closing is required, operate the closing switch 6. The blocking of the closing cam 53 is released. The closing cam 53 and the energy storage shaft 5 rotate in the second direction driven by the energy stored in the closing energy storage spring 4. The closing cam 53 pushes the closing energy storage output arm 21 to rotate in the first direction, and then drives the main shaft 2 to rotate in the first direction. The control end 31 of the link mechanism 3 is lifted by the rotation of the main shaft 2 in the first direction to complete the closing.

[0048] During the closing process, since the control end 31 of the link mechanism 3 is lifted, the opening spring is stretched, putting the opening energy storage spring 7 in an energy storage state. The energy stored in the opening energy storage spring 7 can drive the main shaft 2 to rotate in the second direction. However, since the opening switch 9 is not opened at this time, the rotation of the main shaft 2 in the second direction is blocked by the closing holding assembly 8, and it remains in the closed state.

[0049] Operate the opening switch 9 to release the restriction on the rotation of the main shaft 2 in the second direction by the closing holding assembly 8. Under the action of the energy stored in the opening energy storage spring 7, the main shaft 2 rotates in the second direction, and the control end 31 of the link mechanism 3 moves downward to complete the opening.

[0050] Embodiment 2

[0051] The difference between this embodiment and Embodiment 1 is that the driving member 52 includes a driving gear 54 provided on the energy storage shaft 5, and a motor is provided on the mounting frame 1. The motor drives the driving gear 54 to rotate through a transmission member.

[0052] The closing switch 6 includes a first holding half shaft 61 rotatably connected to the mounting frame 1, a closing pawl 62 rotatably connected to the mounting frame 1, a closing crank arm 611, and a closing driving portion 612 for driving the closing crank arm 611 to rotate. The closing crank arm 611 is connected to the first holding half shaft 61, and a first limiting groove 613 is provided on the first holding half shaft 61. The first limiting groove 613 is used to limit the closing pawl 62. When the closing driving portion 612 is not started, the first limiting groove 613 blocks the closing pawl 62 from rotating in the second direction, and the closing pawl 62 blocks the closing cam 53 from rotating in the second direction. When the closing driving portion 612 is started, the first limiting groove 613 releases the limitation on the closing cam 53 by limiting the closing pawl 62 through contact.

[0053] The closing driving portion 612 includes a closing button slidably connected to the mounting plate, and the sliding of the closing button can push the closing crank arm 611 to rotate.

[0054] When the closing energy storage spring 4 is not energized, the motor is energized, the output end of the motor rotates, drives the driving gear 54 to rotate, thereby driving the energy storage shaft 5 to rotate in the second direction (counterclockwise in the left view), synchronously drives the energy storage crank arm 51 to rotate, and the closing energy storage spring 4 is stretched, so that the closing energy storage spring 4 reaches the energy storage state; and synchronously drives the closing cam 53 to rotate a certain angle in the second direction until the closing cam 53 abuts against the closing pawl 62, and the closing pawl 62 is blocked by the first retaining half shaft 61. At this time, the rotation of the closing cam 53 in the second direction is blocked;

[0055] When closing is required, press the closing button. The closing button slides along the mounting plate to push the closing crank arm 611 to rotate. The first retaining half shaft 61 rotates until the closing pawl 62 is opposite to the first limiting groove 613 thereon. The rotation of the closing pawl 62 in the second direction is released. The closing pawl 62 rotates a certain angle (the angle is small and is still limited by the first limiting groove 613, and the half shaft can be pushed back to its original position by rotation). The blocking of the closing cam 53 is released. The closing cam 53 and the energy storage shaft 5 rotate in the second direction under the drive of the energy stored in the closing energy storage spring 4. The closing cam 53 pushes the closing energy storage output arm 21 to rotate in the first direction, and then drives the main shaft 2 to rotate in the first direction; the control end 31 of the link mechanism 3 is lifted by the rotation of the main shaft 2 in the first direction to complete the closing.

[0056] During the closing process, since the control end 31 of the link mechanism 3 is lifted, the opening spring is stretched, so that the opening energy storage spring 7 is in the energy storage state. The energy stored in the opening energy storage spring 7 can drive the main shaft 2 to rotate in the second direction; however, since the opening switch 9 is not opened at this time, under the action of the closing holding assembly 8, the rotation of the main shaft 2 in the second direction is blocked and still remains in the closed state.

[0057] The closing holding assembly 8 includes a tripping catch plate 81, a locking catch plate 82, a torsion spring 83 and a closing holding half shaft 84 rotatably connected to the mounting frame 1. The middle of the tripping catch plate 81 is rotatably connected to the mounting frame 1 through a rotating shaft 811. A tripping transmission arm 22 is arranged on the main shaft 2, and a sliding groove is arranged on the tripping transmission arm 22. One end of the locking catch plate 82 is hinged to the end of the tripping catch plate 81 away from the closing holding half shaft 84, and the other end is slidably connected to the sliding groove of the tripping transmission arm 22; the spring coil of the torsion spring 83 is sleeved on the rotating shaft 811. One end of the torsion spring 83 is pressed against the side wall of the tripping catch plate 81 facing the closing holding half shaft 84, and the other end of the torsion spring 83 is pressed against the side wall of the locking catch plate 82 facing the main shaft 2; a limiting rod 85 is arranged on the mounting frame 1. The tripping catch plate 81 is arranged between the limiting rod 85 and the closing holding half shaft 84, and the limiting rod 85 is used to limit the rotation of the tripping catch plate 81 in the first direction;

[0058] A second limiting groove 841 is provided on the closing holding half shaft 84, and the limiting groove is used to limit the opening plate 81 to rotate in the second direction. The opening switch 9 is used to drive the opening holding half shaft to rotate so that the second limiting groove 841 releases the limit on the opening plate 81.

[0059] The opening switch 9 includes an opening button 91 slidably connected to the mounting plate, and an opening crank arm 86 is connected to the closing holding semi-shaft 84. The sliding movement of the opening button 91 can push the opening crank arm 86 to rotate.

[0060] Operate the opening switch 9, contact the closing holding assembly 8 to limit the rotation of the main shaft 2 in the second direction. Under the action of the energy stored in the opening energy storage spring 7, the main shaft 2 rotates in the second direction, and the control end 31 of the connecting rod mechanism 3 moves downward to complete the opening.

[0061] During the closing process, the main shaft 2 rotates in the first direction, driving the opening transmission arm 22 to rotate in the first direction. At this time, under the pressing action of the torsion spring 83 on the locking plate 82, the locking plate 82 slides to the end of the sliding groove away from the main shaft 2. Driven by the locking plate 82, the opening plate 81 rotates in the second direction by a certain angle until the opening plate 81 contacts the closing holding half shaft 84, and then its rotation in the second direction is blocked. This is the state when the closing is completed.

[0062] When opening the gate is required, the opening button 91 is pressed, and the opening button 91 drives the opening crank arm 86 to rotate, and the opening crank arm 86 drives the closing holding half shaft 84 to rotate, so that the closing holding half shaft 84 releases the rotation of the opening buckle plate 81 in the second direction; then the opening buckle plate 81 (and the torsion spring 83 in contact with it) rotates a certain angle in the second direction, and due to the restoring force of the torsion spring 83 itself, the torsion spring 83 at the contact end with the opening buckle plate 81 rotates in the first direction again. At this time, the energy stored in the opening energy storage spring 7 drives the main shaft 2 to rotate in the second direction, drives the control end 31 of the connecting rod mechanism 3 to move downward, and completes the opening of the gate; the main shaft 2 drives the opening transmission arm 22 to rotate in the second direction, drives the other end of the torsion spring 83 to rotate in the second direction, and the locking plate 82 slides to the end of the sliding groove close to the main shaft 2. This is the state when the opening of the gate is completed.

[0063] The connecting rod mechanism 3 includes a transmission arm 32, a first arm 33 and a second arm 34. The transmission arm 32 is fixed to the main shaft 2. One end of the first arm 33 is hinged to the end of the transmission arm 32 away from the main shaft 2, and the other end is hinged to the second arm 34. The middle part of the second arm 34 is a hinge part 36, and the hinge part 36 is hinged to the mounting frame 1 through a rotating shaft. The end of the second arm 34 away from the first arm 33 is the control end 31; the opening energy storage spring 7 is connected to the second arm 34 at a side of the rotating shaft away from the control end 31 (installed at the mounting hole 35 in this embodiment).

[0064] During the closing process, when the main shaft 2 rotates in the first direction, the transmission arm 32 also rotates in the first direction. One end of the second arm 34 close to the first arm 33 descends, and the middle part of the second part is fixed. Thus, the end of the second arm 34 far from the first arm 33, i.e., the control end 31, is lifted to complete the closing.

[0065] During the opening process, the energy stored in the opening energy storage spring 7 causes the end of the second arm 34 close to the first arm 33 to be lifted, and the control end 31 of the second arm 34 descends, thus completing the opening. At the same time, the main shaft 2 rotates in the second direction.

[0066] A buffer arm is fixedly connected to the main shaft 2. An oil buffer 10 is arranged on the mounting bracket 1. A collision head 101 is arranged at the top of the oil buffer 10. When the main shaft 2 rotates, the buffer arm can strike the collision head 101. By arranging the oil buffer 10, through the collision between the buffer arm and the collision head 101, effective buffering can be carried out to reduce vibration.

[0067] The first direction and the second direction are opposite directions.

[0068] There are two closing energy storage springs 4, and the two closing energy storage springs 4 are respectively arranged at both ends of the energy storage shaft 5, which is beneficial to the stability of the energy storage shaft 5.

[0069] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific situations.

[0070] The above are only the preferred embodiments of the present application. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present application, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present application.

Claims

1. A spring operating mechanism for a low-frequency circuit breaker, characterized in that, Comprising: Mounting bracket; Main shaft, rotatably connected to the mounting bracket. When the main shaft rotates in the first direction, it can drive the control end of the linkage mechanism to lift, completing closing. When the main shaft rotates in the second direction, it can drive the control end of the linkage mechanism to move down, completing opening. A closing energy storage output arm is provided on the main shaft; Closing energy storage spring. A storage shaft is rotatably connected to the mounting bracket. One end of the closing energy storage spring is fixed, and the other end is connected to the storage shaft through a storage crank arm. When the storage shaft rotates, it can stretch the closing energy storage spring for energy storage. The storage shaft is driven to rotate by a driving member; a closing cam is provided on the storage shaft. The energy stored in the closing energy storage spring can drive the storage shaft and the closing cam to rotate in the second direction and push the closing energy storage output arm to rotate in the first direction through the rotation of the closing cam, thereby driving the main shaft to rotate in the first direction; Closing switch, used to limit the rotation of the storage shaft through the closing cam. When the closing switch is not opened, the rotation of the closing cam in the second direction is blocked. When the closing switch is opened, the closing cam and the storage shaft can rotate in the second direction under the drive of the stored energy; Opening energy storage spring. One end of the opening energy storage spring is fixed on the mounting bracket, and the other end is connected to the linkage mechanism. When closing is completed, the opening energy storage spring is stretched and is in an energy storage state. The energy stored in the opening energy storage spring can drive the control end of the linkage mechanism to move down and the main shaft to rotate in the second direction; Closing holding component, used to limit the rotation of the main shaft in the second direction in the closed state; Opening switch, used to release the restriction of the closing holding component on the rotation of the main shaft in the second direction.

2. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, characterized in that The closing holding component includes a tripping catch plate, a locking catch plate, a torsion spring and a closing holding half shaft rotatably connected to the mounting bracket. The middle of the tripping catch plate is rotatably connected to the mounting bracket through a rotating shaft. A tripping transmission arm is provided on the main shaft, and a sliding groove is provided on the tripping transmission arm. One end of the locking catch plate is hinged to the end of the tripping catch plate away from the closing holding half shaft, and the other end is slidably connected to the sliding groove of the tripping transmission arm; the spring coil of the torsion spring is sleeved on the rotating shaft. One end of the torsion spring is pressed against the side wall of the tripping catch plate on the side facing the closing holding half shaft, and the other end of the torsion spring is pressed against the side wall of the locking catch plate on the side facing the main shaft; a limiting rod is provided on the mounting bracket. The tripping catch plate is arranged between the limiting rod and the closing holding half shaft, and the limiting rod is used to limit the rotation of the tripping catch plate in the first direction; A second limiting groove is provided on the closing holding half shaft. The limiting groove is used to limit the rotation of the tripping catch plate in the second direction. The opening switch is used to drive the closing holding half shaft to rotate so that the second limiting groove releases the limit on the tripping catch plate.

3. The spring operating mechanism of the low-frequency circuit breaker according to claim 2, characterized in that, The opening switch includes a tripping button slidably connected to the mounting plate. A tripping crank arm is connected to the closing holding half shaft, and the tripping button can slide to push the tripping crank arm to rotate.

4. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, characterized in that, The closing switch includes a first retaining half shaft rotatably connected to the mounting frame, a closing pawl rotatably connected to the mounting frame, a closing crank arm, and a closing driving portion for driving the closing crank arm to rotate. The closing crank arm is connected to the first retaining half shaft. A first limiting groove is provided on the first retaining half shaft, and the first limiting groove is used to limit the closing pawl. When the closing driving portion is not activated, the first limiting groove blocks the closing pawl from rotating in the second direction, and the closing pawl blocks the closing cam from rotating in the second direction. When the closing driving portion is activated, the first limiting groove releases the limit on the closing cam by limiting the closing pawl through contact.

5. The low-frequency circuit breaker spring operating mechanism according to claim 4, characterized in that, The closing driving portion includes a closing button slidably connected to the mounting plate, and the sliding of the closing button can push the closing crank arm to rotate.

6. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, characterized in that, The link mechanism includes a transmission arm, a first arm, and a second arm. The transmission arm is fixed to the main shaft. One end of the first arm is hinged to the end of the transmission arm away from the main shaft, and the other end is hinged to the second arm. The middle of the second arm is hinged to the mounting frame through a rotating shaft, and the end of the second arm away from the first arm is the control end.

7. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, characterized in that, The driving member includes a driving gear provided on the energy storage shaft, and a motor is provided on the mounting frame, and the motor is used to drive the gear to rotate.

8. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, characterized in that, A buffer arm is provided on the main shaft, and an oil buffer is provided on the mounting frame. A collision receiving head is provided at the top of the oil buffer. When the main shaft rotates, the buffer arm can strike the collision receiving head.

9. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, wherein, The first direction and the second reverse direction are opposite directions.

10. The spring operating mechanism of the low-frequency circuit breaker according to claim 1, wherein, There are two closing energy storage springs, and the two closing energy storage springs are respectively arranged at both ends of the energy storage shaft.

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