Trolley switch

Abstract

The utility model discloses a dolly switch, which comprises a dolly main body, one or more duplex vacuum arc-extinguishing chambers are arranged on the dolly main body, a static contact is arranged in each duplex vacuum arc-extinguishing chamber, two sides of the static contact are respectively provided with a moving contact, and the static contact and the moving contacts are respectively connected with a wiring terminal. A driving mechanism and an opening and closing mechanism are further installed on the trolley body, the driving mechanism drives the opening and closing mechanism to act, and the opening and closing mechanism selectively drives the moving contact and the static contact on one side in the duplex vacuum arc-extinguishing chamber to be separated or closed. The switch is specially designed for the uninterruptible power system and is provided with a static contact and two moving contacts, a load can be led out from the static contact, and the two moving contacts and the static contact can be controlled to be separated or closed respectively.

Description

Technical Field

[0001] This utility model relates to the field of power system protection technology, specifically to a trolley switch. Background Technology

[0002] High-voltage trolley switches, typically referring to circuit breaker trolley switches in trolley-type high-voltage switchgear, are devices used to connect or disconnect high-voltage loads in power systems. Widely used in power systems, they mainly consist of a vacuum interrupter, an operating mechanism, and a trolley section. During operation, the moving and stationary contacts are opened and closed by the action of the operating mechanism, thus achieving circuit connection and disconnection. When a phase-to-phase short circuit or single-phase ground fault occurs in a three-phase power supply system, tripping is necessary to eliminate the fault. However, in existing three-phase power supply systems, tripping often results in a large area of ​​load being de-energized. To reduce the area affected by power outages (i.e., reduce the number of loads affected by power outages), a three-phase power supply system that ensures uninterrupted power supply to loads after a line fault is disclosed in invention patent application number 2024118476853. This system includes multiple controlled units on the power supply line, with a first power source and a second power source connected to the left and right sides of each unit respectively. Each controlled unit is powered by the two power sources. Each controlled unit includes a protective casing and a first switch and a second switch connected in series on the power supply line within the casing. A load is drawn between the first and second switches, achieving uninterrupted power supply after a line fault. However, there is currently no controlled unit specifically designed for this system. Utility Model Content

[0003] The purpose of this utility model is to provide a trolley switch, which is specifically designed for the aforementioned uninterruptible power supply system. It has one stationary contact and two moving contacts, and the load can be led out from the stationary contact. The two moving contacts can be controlled to separate or close from the stationary contact.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A trolley switch includes a trolley body, on which one or more double vacuum interrupters are mounted. A stationary contact is provided within each double vacuum interrupter, and moving contacts are provided on both sides of the stationary contact. The stationary and moving contacts are respectively connected to terminals. A drive mechanism and an opening / closing mechanism are also mounted on the trolley body. The drive mechanism drives the opening / closing mechanism to operate, and the opening / closing mechanism can selectively cause the moving contact on one side of the double vacuum interrupter to separate or close from the stationary contact.

[0006] Preferably, three of the double vacuum interrupters are installed on the main body of the trolley.

[0007] Preferably, the terminal connected to the moving contact is used for connection to a power source, and the terminal connected to the stationary contact is used for connection to a load or branch line.

[0008] Preferably, the opening and closing mechanism includes a first support arm, a switch spindle, a closing arm, and multiple opening and closing components fixedly installed inside the trolley body. The switch spindle is rotatably mounted on the first support arm, and one end of the closing arm is fixedly connected to the switch spindle. One end of the opening and closing component is connected to the moving contact of the double vacuum interrupter. The driving mechanism drives the closing arm to swing, and the opening and closing component is activated by the switch spindle, thereby realizing the control of the closing or opening of the moving contact and the stationary contact in the double vacuum interrupter.

[0009] Preferably, the opening and closing assembly includes a switch arm fixedly mounted on the switch spindle at one end, a connecting rod hinged to one end of the switch arm, a second support arm fixedly mounted inside the trolley body, a swing rod hinged to the second support arm, a third support arm fixedly mounted inside the trolley body, and a closing spring disposed between the third support arm and the swing rod. One end of the swing rod is hinged to the connecting rod, and the other end of the swing rod is connected to the moving contact of the double vacuum interrupter.

[0010] Preferably, the drive mechanism includes a motor fixedly installed inside the vehicle body, a reducer poweredly connected to the output shaft of the motor, a first gear disposed on the output end of the reducer, two fourth support arms fixedly installed inside the vehicle body, a cam assembly disposed on the fourth support arms, and a ratchet drive assembly disposed between the two cam assemblies. The first gear can drive the ratchet drive assembly to rotate, and the ratchet drive assembly can drive the cam assembly to rotate.

[0011] Preferably, the cam assembly includes an energy storage shaft rotatably mounted on the fourth support arm, an energy storage crank arm fixedly mounted on one end of the energy storage shaft, an energy storage spring disposed between the energy storage crank arm and the fourth support arm, a cam fixedly mounted on the other end of the energy storage shaft, a support plate fixedly mounted on one side of the cam, a pawl hingedly mounted on the support plate, and a return spring mounted on the support plate. One end of the return spring abuts against the pawl, connecting the pawl to the ratchet drive assembly. An energy storage stop is disposed on one side of the pawl, which can separate the pawl from the ratchet drive assembly when it contacts the pawl.

[0012] Preferably, the ratchet drive assembly includes a drive shaft rotatably mounted on the two energy storage shafts, a second gear fixedly mounted on the drive shaft, and two ratchet wheels fixedly mounted on the drive shaft. The two ratchet wheels are located on both sides of the second gear, and the second gear is meshed with the first gear. When the ratchet wheel is engaged with the pawl, the drive shaft drives the energy storage shaft to rotate synchronously. When the ratchet wheel is disengaged from the pawl, the drive shaft rotates independently relative to the energy storage shaft.

[0013] Preferably, the two energy storage cranks are arranged symmetrically at 180°.

[0014] In this invention, the double-unit vacuum interrupter has two moving contacts, each connected to a stationary contact to establish circuit continuity. Compared to using two vacuum interrupters connected in series, this reduces the number of stationary contacts, decreases the wiring complexity, and improves system safety. The opening and closing mechanism enables the moving contacts on the same side of all three double-unit vacuum interrupters to operate synchronously.

[0015] The drive mechanism allows two sets of opening and closing mechanisms to operate simultaneously, making the overall structure more compact. The two energy storage cranks are arranged symmetrically at 180°. When storing energy in the energy storage springs, the two energy storage springs alternately store energy, reducing the driving power of the motor. The ratchet drive assembly can be connected or disconnected from the cam assembly, facilitating closing and opening operations.

[0016] When the circuit is closed, the switch arm and the connecting rod are in a straight line, and their hinge point is in a dead point state. Without the intervention of external forces, the two will not rotate relative to each other, thus making the closed state more stable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the double vacuum interrupter of this utility model;

[0020] Figure 4 This is a schematic diagram showing the left-side opening and closing mechanism of this utility model in the open state and the right-side opening and closing mechanism in the closed state.

[0021] Figure 5 This is a partial structural diagram of the drive mechanism of this utility model;

[0022] Figure 6 This is a schematic diagram of the energy storage spring of the right cam assembly structure of this utility model after releasing energy;

[0023] Figure 7 This is a schematic diagram of the state of the left-side opening and closing mechanism of this utility model after the gate is closed and the energy storage spring releases energy.

[0024] Figure 8 This is a schematic diagram of the right-side opening and closing mechanism of this utility model after the circuit breaker is open and the energy storage spring has completed energy storage.

[0025] In the diagram: 1. Car body; 2. Double vacuum interrupter; 3. Wheels; 4. Drive mechanism; 5. Opening and closing mechanism; 6. Trigger switch; 7. High-voltage inlet; 8. High-voltage outlet; 20. Stationary contact; 21. Ceramic tube; 22. End cap; 23. Sliding sleeve; 24. Moving contact; 25. Outlet terminal; 26. Inlet terminal; 27. Insulating sleeve; 40. Motor; 41. Reducer; 42. First gear; 43. Fourth support arm; 44. Cam assembly; 45. Ratchet drive assembly; 50. First support arm ; 51. Switch spindle; 52. Closing arm; 53. Opening / closing assembly; 440. Energy storage shaft; 441. Energy storage crank arm; 442. Energy storage spring; 443. Cam; 444. Support plate; 445. Pawl; 446. Return spring; 447. Energy storage stop; 448. Closing stop; 450. Drive shaft; 451. Second gear; 452. Ratchet; 530. Switch arm; 531. Connecting rod; 532. Second support arm; 533. Swing rod; 534. Third support arm; 535. Opening spring. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] like Figures 1 to 8 The illustrated trolley switch includes a trolley body 1 and multiple casters 3 located at the bottom of the trolley body 1. The switch can be moved by the casters 3. Alternatively, a handle can be provided on the trolley body 1 for pushing the trolley. The casters 3 are preferably omnidirectional wheels, and brakes are provided on the casters 3 to facilitate fixing the position. The trolley body 1 is formed by splicing multiple panels to form a sealed rectangular box.

[0028] One or more double vacuum interrupters 2 are fixedly installed on the main body 1 of the trolley. In this embodiment, three double vacuum interrupters 2 are fixedly installed on the back of the main body 1 of the trolley. Specifically, each double vacuum interrupter 2 includes a stationary contact 20, ceramic tubes 21 fixedly disposed on the outer sides of both ends of the stationary contact, an end cap 22 fixedly disposed on the end of the ceramic tube 21, a sliding sleeve 23 fixedly disposed on the end cap 22, and a moving contact 24 slidably disposed within the sliding sleeve 23. When the moving contact 24 slides horizontally along the sliding sleeve 23, it can make contact with or separate from the stationary contact 20. The two moving contacts 24 are disposed on both sides of the stationary contact 20.

[0029] The stationary contact 20 and the moving contact 24 are respectively connected to terminals. The terminal connected to the moving contact 24 is used to connect to the power supply, and the terminal connected to the stationary contact 20 is used to connect to the load or branch line. In this embodiment, the terminal electrically connected to the stationary contact 20 is defined as the output terminal 25, and the terminal electrically connected to the moving contact 24 is defined as the input terminal 26. When the stationary contact 20 and the moving contact 24 are in contact, the corresponding input terminal 26 and output terminal 25 are electrically connected. When the stationary contact 20 and the moving contact 24 are separated, the corresponding input terminal 26 and output terminal 25 are electrically disconnected. By connecting the two input terminals 26 to the output terminals 25 respectively, the two power supplies can independently supply power to the load or branch line. An insulating sleeve 27 is provided on the outside of the ceramic tube 21, and the end of the insulating sleeve 27 is fixedly installed on the back of the trolley body 1.

[0030] A drive mechanism 4 and opening / closing mechanisms 5 are installed inside the main body 1 of the trolley. The drive mechanism 4 drives the two opening / closing mechanisms 5 to operate. The opening / closing mechanisms 5 can selectively cause the moving contact 24 and the stationary contact 20 on one side of the double vacuum interrupter 2 to separate or close. Of course, the drive mechanism 4 and the opening / closing mechanisms 5 can also adopt other arrangements, as long as one set of drive mechanism 4 drives two sets of opening / closing mechanisms 5 to operate, and the specific positional relationship is not limited.

[0031] The opening and closing mechanism 5 includes a first support arm 50, a switch spindle 51, a closing arm 52, and multiple opening and closing components 53, all fixedly installed within the trolley body 1. Two first support arms 50 are provided, and the switch spindle 51 is rotatably mounted on the two first support arms 50. One end of the closing arm 52 is fixedly connected to the switch spindle 51. The position and number of the opening and closing components 53 are adapted to the position and number of the double vacuum interrupter 2. One end of the opening and closing component 53 is connected to the moving contact 24 of the double vacuum interrupter 2. The drive mechanism 4 drives the closing arm 52 to swing, and then the switch spindle 51 causes the opening and closing components 53 to move, thus controlling the closing or opening of the moving contact 24 and the stationary contact 20 in the double vacuum interrupter 2.

[0032] The opening / closing assembly 53 includes a switch arm 530 fixedly mounted on the switch spindle 51 at one end, a connecting rod 531 hinged to one end of the switch arm 530, a second support arm 532 fixedly mounted inside the trolley body 1, a swing rod 533 hingedly mounted on the second support arm 532, a third support arm 534 fixedly mounted inside the trolley body 1, and a tripping spring 535 disposed between the third support arm 534 and the swing rod 533. One end of the swing rod 533 is hingedly connected to the connecting rod 531. The other end of the swing rod 533 is connected to the moving contact 24 of the double vacuum interrupter 2. The hinge hole of the swing rod 533 is an oblong hole. When the switch spindle 51 drives the switch arm 530 to swing upward, the connecting rod 531 drives the swing rod 533 to swing around the hinge point with the second support arm 532. When the switch arm 530 swings upward to its limit position, the swing rod 533 drives the moving contact 24 to close with the stationary contact 20. At this time, in the closed state, the switch arm 530 and the connecting rod 531 are collinear, the opening spring 535 is in an energy storage state, and the hinge point between the switch arm 530 and the connecting rod 531 is the dead point in the linkage mechanism, ensuring the stability of the closing. In a preferred embodiment, a pressure spring is installed between the swing rod 533 and the moving contact 24. The error generated during installation can be offset by the elastic deformation of the pressure spring, ensuring the reliability of the closing of the moving contact 24 and the stationary contact 20 in the closed state. In use, a trigger switch 6 is installed above or below the hinge point of the switch arm 530, the connecting rod 531, and / or both. When it is necessary to open the circuit, the operator controls the trigger switch 6 to apply a downward or upward force to the switch arm 530 or the connecting rod 531, causing the dead point to disengage. Under the tension of the opening spring 535, the swing rod 533 swings in the opposite direction instantaneously, realizing the separation of the moving contact 24 from the stationary contact 20. The trigger switch 6 is installed on the trolley body 1. The trigger switch 6 is a commonly used manual switch or an electromagnetic electric switch. The specific structure of the trigger switch 6 will not be described in detail in this manual.

[0033] The drive mechanism 4 includes a motor 40 fixedly installed inside the trolley body 1, a reducer 41 poweredly connected to the output shaft of the motor 40, a first gear 42 powered on the output end of the reducer 41, two fourth support arms 43 fixedly installed inside the trolley body 1, cam assemblies 44 mounted on the fourth support arms 43, and a ratchet drive assembly 45 mounted between the two cam assemblies 44. The first gear 42 can drive the ratchet drive assembly 45 to rotate, and the ratchet drive assembly 45 can drive the cam assemblies 44 to rotate. The two cam assemblies 44 drive the two opening and closing mechanisms 5 to operate respectively.

[0034] The cam assembly 44 includes an energy storage shaft 440 rotatably mounted on the fourth support arm 43, an energy storage crank arm 441 fixedly mounted on one end of the energy storage shaft 440, an energy storage spring 442 disposed between the energy storage crank arm 441 and the fourth support arm 43, a cam 443 fixedly mounted on the other end of the energy storage shaft 440, a support plate 444 fixedly mounted on one side of the cam 443, a pawl 445 hingedly mounted on the support plate 444, and a return spring 446 mounted on the support plate 444. One end of the return spring 446 abuts against the pawl 445, so that the pawl 445 is connected to the ratchet drive assembly 45. An energy storage stop 447 is disposed on one side of the pawl 445. When the energy storage stop 447 contacts the pawl 445, the pawl 445 can be connected to the ratchet drive assembly 45. The support plate 444 can also be fixedly mounted on the energy storage shaft 440.

[0035] When the energy storage spring 442 has finished storing energy, the cam 443 drives the pawl 445 to the position corresponding to the energy storage lever 447. The energy storage lever 447 presses down on one end of the pawl 445, causing the pawl 445 to disengage from the ratchet 452. In other positions, the pawl 445 and the ratchet 452 are in a meshing state.

[0036] The energy storage stop 447 can move linearly or oscillate. An energy storage switch is installed on the trolley body 1. This energy storage switch is a commercially available manual switch or electromagnetic electric switch. The energy storage switch is used to control the action of the energy storage stop 447 and to control the engagement or disengagement of the pawl 445 and ratchet 452. The specific structure of the energy storage switch and the energy storage stop 447 is not described in detail in this manual. A closing stop 448 is installed on the trolley body 1. The closing stop 448 is used to control the rotation of the cam 443 or the energy storage crank arm 441. When closing is required, the operator controls the closing stop 448 to disengage from the cam 443 or the energy storage crank arm 441, and the closing is achieved under the action of the energy storage spring 442. The closing stop 448 adopts a commercially available structure, and this structure is not described in detail in this manual.

[0037] The ratchet drive assembly 45 includes a drive shaft 450 rotatably mounted on two energy storage shafts 440, a second gear 451 fixedly mounted on the drive shaft 450, and two ratchet wheels 452 fixedly mounted on the drive shaft 450. The two ratchet wheels 452 are located on both sides of the second gear 451. The second gear 451 is meshed with the first gear 42. When the ratchet wheel 452 is engaged with the pawl 445, the drive shaft 450 drives the energy storage shaft 440 to rotate synchronously. When the ratchet wheel 452 is disengaged from the pawl 445, the drive shaft 450 rotates independently relative to the energy storage shaft 440. In this embodiment, the two energy storage cranks 441 are arranged symmetrically at 180°. When storing energy in the energy storage springs 442, the two energy storage springs 442 alternately store energy, reducing the drive power of the motor 40 and lowering the overall cost.

[0038] Before the closing operation, the energy storage spring 442 is first energized. Specifically, under the action of the return spring 446, the pawl 445 engages with the ratchet 452. The controller controls the motor 40 to rotate, and the second gear 451 meshes with the first gear 42, causing the drive shaft 450 to rotate. The ratchet 452 engages with the pawl 445, causing the energy storage shaft 440 to rotate synchronously. When the energy storage crank arm 441 rotates to its lowest position, the energy storage spring 442 completes its energy storage. At this point, the cam 443 or the energy storage crank arm 441 is stopped by the closing stop 448.

[0039] When the energy storage spring 442 in the first cam assembly 44 has completed energy storage, and it is necessary to store energy for another energy storage spring 442, the energy storage stop 447 in the first cam assembly 44 is activated, so that the energy storage stop 447 contacts the pawl 445, and the pawl 445 is separated from the ratchet 452. The ratchet drive assembly 45 drives the energy storage spring 442 in the other cam assembly 44 to store energy separately. After the energy storage is completed, the energy storage stop 447 returns to the initial position.

[0040] Of course, the energy storage lever 447 can also be a fixed part, that is, the energy storage lever 447 is fixed on the housing 1. When the pawl 445 rotates to the position of the energy storage lever 447, the energy storage lever 447 presses down on one end of the pawl 445, so that the pawl 445 disengages from the ratchet 452. At this time, the energy storage spring 442 completes energy storage. In this state, even if the motor 40 continues to drive the ratchet 452 to rotate, the first cam assembly 44 on the side where energy storage is completed will not continue to rotate.

[0041] Closing operation, with Figure 4 The opening and closing mechanism 5 on the left is used as an example for illustration. Figure 4 The opening / closing mechanism 5 on the left is in the open state. When closing is required, the operator controls the closing lever 448 to separate from the cam 443 or the energy storage crank arm 441. Under the action of the energy storage spring 442, the energy storage crank arm 441 drives the cam 443 to rotate counterclockwise quickly, and the pawl 445 rotates independently relative to the ratchet 452. The cantilevered end of the closing arm 52 is squeezed by the cam 443 and swings clockwise, which in turn drives the switch main shaft 51 and the switch arm 530 to swing clockwise. Then, through the connecting rod 531, the swing rod 533 swings clockwise around the hinge point with the second support arm 532. The cantilevered end of the switch arm 530 swings upward to the limit position, and the swing rod 533 drives the moving contact 24 to quickly approach the stationary contact 20 and close tightly with it, completing the closing operation, forming a closed state. Figure 7 The state of the opening and closing mechanism 5 is shown. In the closed state, the switch arm 530 and the connecting rod 531 are collinear, the opening spring 535 is in the energy storage state, and the hinge point between the switch arm 530 and the connecting rod 531 is the dead point in the linkage mechanism, which ensures the stability of the closing.

[0042] The circuit breaker tripping operation, with Figure 4 The opening and closing mechanism 5 on the right side will be used as an example for illustration. Figure 4 The opening and closing mechanism 5 on the right is in the closed state. When a tripping operation is required, the operator controls the trigger switch 6 to apply an upward force to the switch arm 530 or the connecting rod 531, causing the dead point formed by the switch arm 530 and the connecting rod 531 to disengage. That is, the hinge point of the switch arm 530 and the connecting rod 531 moves upward. Under the tension of the tripping spring 535, the swing rod 533 swings clockwise instantaneously around the hinge point with the second support arm 532. The upper end of the swing rod 533 pulls the moving contact 24 away from the stationary contact 20 and separates it from it, thus completing the tripping operation and forming a closed circuit. Figure 8 The state of the opening and closing mechanism 5 shown.

[0043] The above embodiments are merely illustrative of the concept and implementation of this utility model, and are not intended to limit it. Under the concept of this utility model, the technical solutions without substantial changes are still within the scope of protection.

Claims

1. A trolley switch, comprising a trolley body, characterized in that: One or more double vacuum interrupters are installed on the main body of the trolley. A stationary contact is provided in the double vacuum interrupter, and a moving contact is provided on both sides of the stationary contact. The stationary contact and the moving contact are respectively connected to the terminal block. A drive mechanism and an opening and closing mechanism are also installed on the main body of the trolley. The drive mechanism drives the opening and closing mechanism to operate. The opening and closing mechanism can selectively drive the moving contact on one side of the double vacuum interrupter to separate or close from the stationary contact.

2. The trolley switch according to claim 1, characterized in that: Three of the aforementioned double-vacuum interrupters are installed on the main body of the trolley.

3. The trolley switch according to claim 1 or 2, characterized in that: The terminal block connected to the moving contact is used for connection to the power supply, and the terminal block connected to the stationary contact is used for connection to the load or branch line.

4. The trolley switch according to claim 3, characterized in that: The opening and closing mechanism includes a first support arm, a switch spindle, a closing arm, and multiple opening and closing components, all fixedly installed within the trolley body. The switch spindle is rotatably mounted on the first support arm, and one end of the closing arm is fixedly connected to the switch spindle. One end of each opening and closing component is connected to the moving contact of the double vacuum interrupter. The drive mechanism drives the closing arm to swing, and the opening and closing components are activated by the switch spindle, thereby controlling the closing or opening of the moving and stationary contacts in the double vacuum interrupter.

5. The trolley switch according to claim 4, characterized in that: The opening and closing assembly includes a switch arm fixedly mounted on the switch spindle at one end, a connecting rod hinged to one end of the switch arm, a second support arm fixedly mounted inside the trolley body, a swing rod hinged to the second support arm, a third support arm fixedly mounted inside the trolley body, and a opening spring disposed between the third support arm and the swing rod. One end of the swing rod is hinged to the connecting rod, and the other end of the swing rod is connected to the moving contact of the double vacuum interrupter.

6. The trolley switch according to claim 1 or 5, characterized in that: The drive mechanism includes a motor fixedly installed inside the vehicle body, a reducer poweredly connected to the output shaft of the motor, a first gear disposed on the output end of the reducer, two fourth support arms fixedly installed inside the vehicle body, a cam assembly disposed on the fourth support arms, and a ratchet drive assembly disposed between the two cam assemblies. The first gear can drive the ratchet drive assembly to rotate, and the ratchet drive assembly can drive the cam assembly to rotate.

7. The trolley switch according to claim 6, characterized in that: The cam assembly includes an energy storage shaft rotatably mounted on the fourth support arm, an energy storage crank arm fixedly mounted on one end of the energy storage shaft, an energy storage spring disposed between the energy storage crank arm and the fourth support arm, a cam fixedly mounted on the other end of the energy storage shaft, a support plate fixedly mounted on one side of the cam, a pawl hingedly mounted on the support plate, and a return spring mounted on the support plate. One end of the return spring abuts against the pawl, connecting the pawl to the ratchet drive assembly. An energy storage stop is disposed on one side of the pawl, which can separate the pawl from the ratchet drive assembly when it contacts the pawl.

8. The trolley switch according to claim 7, characterized in that: The ratchet drive assembly includes a drive shaft rotatably mounted on the two energy storage shafts, a second gear fixedly mounted on the drive shaft, and two ratchet wheels fixedly mounted on the drive shaft. The two ratchet wheels are located on both sides of the second gear, and the second gear is meshed with the first gear. When the ratchet wheel is engaged with the pawl, the drive shaft drives the energy storage shaft to rotate synchronously. When the ratchet wheel is disengaged from the pawl, the drive shaft rotates independently relative to the energy storage shaft.

9. The trolley switch according to claim 7 or 8, characterized in that: The two energy storage crank arms are arranged symmetrically at 180°.

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