High current load switch

Abstract

The application discloses a high-current load switch, which is provided with a switch assembly and a crank arm connecting assembly on a mechanism frame, a movable contact of an isolating knife assembly is electrically connected with a connecting part of a static contact in a closed position and is separated from the connecting part of the static contact in an open position, a conductive arm is installed on a cam mounting shaft, the conductive arm is provided with a bidirectional swing reset mechanism, the bidirectional swing reset mechanism causes the conductive arm to be subjected to elastic restoring force in clockwise and counterclockwise swing directions around the cam mounting shaft, the movable contact has a conductive poking end, the conductive arm is poked by the conductive poking end in the bidirectional swing process of the movable contact, the conductive arm is reversely elastically restored after being bidirectionally poked and swung through a contact vertex, and the width of the conductive poking end at the upper end of the movable contact is less than two-thirds of the width of the main body of the movable contact. In the high-current connection state of the high-current load switch, the contact time of the movable contact with the conductive arm is shorter when the movable contact is swung outward to break, the burden of a vacuum tube is reduced, and more rapid and safe breaking is realized.

Description

[0001] This application claims priority to Chinese invention patent application filed on December 31, 2025, with application number 202512047638.1 and invention title "A High Current Load Switch". Technical Field

[0002] This invention relates to the field of load switch technology capable of carrying large currents, and particularly to a high-current load switch. Background Technology

[0003] As a key piece of equipment in the power distribution network, the performance of high-current load switches directly affects the reliability of power supply and operational safety. Traditional high-current load switches often adopt single-sided drive and lever transmission structures, which have problems such as uneven force on the transmission chain and off-center wear, resulting in insufficient consistency in opening and closing and limited long-term operational stability. At the same time, the main circuit connection often uses rigid connectors to directly transmit operating stress, which can easily lead to poor contact and abnormal temperature rise under frequent operation, affecting current carrying capacity and electrical life. In terms of isolation break, conventional knife switch structures have poor protection, and the insulation distance and visibility of the break are limited by the structure, posing safety hazards and making maintenance inconvenient. In addition, the mechanism reset and state maintenance often rely on a single spring, lacking effective mechanical positioning and locking, which can easily cause maloperation or state drift under vibration or impact. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a high-current load switch, wherein the moving contact of the high-current load switch has a shorter contact time with the conductive arm and a faster breaking time when it swings outward to break.

[0005] To achieve the above objectives, the present invention provides a high-current load switch, including a frame on which a switch assembly and a crank arm connecting assembly are mounted. The switch assembly includes a vacuum interrupter, a cam drive mechanism for driving the vacuum interrupter, and a stationary contact electrically connected to the vacuum interrupter. The stationary contact is fixedly mounted on the frame and has a connecting portion extending towards the cam drive mechanism. The crank arm connecting assembly includes a crank arm connecting sleeve and an isolating blade assembly. The moving contact of the isolating blade assembly is electrically connected to the connecting portion of the stationary contact in the closed position and disconnected from the connecting portion of the stationary contact in the open position. The cam drive mechanism includes... The device includes a mounting bracket and a transmission assembly and a drive assembly mounted on the mounting bracket. The transmission assembly includes a cam mounting shaft mounted between the mounting brackets. A conductive arm is mounted on the cam mounting shaft. The conductive arm is equipped with a bidirectional swing reset mechanism. The bidirectional swing reset mechanism causes the conductive arm to be subjected to elastic restoring force in both clockwise and counterclockwise swing directions around the cam mounting shaft. The upper end of the moving contact has a conductive actuating end. During the bidirectional swing of the moving contact, the conductive arm is actuated by the conductive actuating end. After the conductive arm swings past the contact vertex in both directions, it elastically returns in the opposite direction. The width of the conductive actuating end at the upper end of the moving contact is less than two-thirds of the width of the moving contact body.

[0006] Preferably, the conductive arm includes a first conductive arm and a second conductive arm located on both sides of the top end of the stationary contact connection portion, the first conductive arm and the second conductive arm are connected by a linkage shaft, and the cam is located between the first conductive arm and the second conductive arm.

[0007] Preferably, the width of the conductive actuating end at the upper end of the moving contact is half the width of the moving contact body.

[0008] Preferably, the moving contact has a dividing groove at the upper part and a circular mounting groove below the dividing groove. The conductive actuating end is the outer end formed by the dividing groove on the moving contact, and the front and rear contact angles of the conductive actuating end are both significantly chamfered.

[0009] Preferably, the bidirectional swing reset mechanism includes a reset torsion spring, a limiting torsion spring, and a synchronizing crank arm. The reset torsion spring is mounted on the cam mounting shaft, with one end connected to the mounting bracket and the other end pressing against the outside of the conductive arm. The reset torsion spring applies an inward swinging restoring force to the conductive arm. The synchronizing crank arm is fixed to the outer end of the cam mounting shaft and swings synchronously thereafter. One end of the limiting torsion spring is connected to the mounting bracket and is located outside the mounting bracket, while the other end has a toggle part. The toggle part presses down on the pressure groove of the synchronizing crank arm from top to bottom. A blocking shaft for blocking the toggle part is provided on the mounting bracket in the transverse direction corresponding to the limiting torsion spring.

[0010] Preferably, the drive assembly includes a crank arm drive shaft mounted between mounting brackets. A left drive crank arm and a right drive crank arm capable of synchronous rotation are rotatably mounted on the crank arm drive shaft. The free ends of the left drive crank arm and the right drive crank arm are connected by a connecting shaft to form a linkage crank arm assembly. The linkage crank arm assembly is provided with a drive connecting shaft. A connecting rod located between the left drive crank arm and the right drive crank arm is connected to the drive connecting shaft. The connecting rod is drivenly connected to the vacuum interrupter.

[0011] Preferably, a first braided flexible connection is connected to the connecting rod, and a second braided flexible connection is connected to the cam mounting shaft, wherein the first braided flexible connection and the second braided flexible connection are electrically connected.

[0012] Preferably, the crank arm connecting sleeve is a cylindrical structure with an internal isolation blade cavity. The isolation blade assembly is rotatably mounted on the mechanism frame and fixedly connected to the crank arm connecting sleeve. The isolation blade assembly includes a moving contact bracket and moving contacts fixed on both sides of the moving contact bracket. The moving contacts pass through the isolation blade cavity and extend to the outside of the crank arm connecting sleeve through vertical distribution.

[0013] The technical effects of this invention are as follows: I. The high-current load switch provided in this application is particularly suitable for carrying high currents, as described above. Figure 12 As shown, in traditional moving contacts, the body and conductive contact end are of equal width, resulting in continuous contact between the conductive arm and the moving contact during relative swinging, especially towards the end of the contact period, making direct disengagement impossible and leading to excessively long conductive contact time; conversely, referring to... Figure 13 As shown, the main body portion below the upper end of the moving contact in this application can be widened to accommodate the need for carrying large currents. A conductive actuating end is provided at the upper end of the moving contact. The width of the conductive actuating end is less than two-thirds of the width of the main body of the moving contact, so that the conductive actuating end and the main body are distributed in a stepped manner. This allows the conductive arm that is actuated by the moving contact to break the circuit not to completely touch the entire width of the moving contact when the moving contact swings outward. The conductive arm only needs to continuously touch the narrower conductive actuating end, which shortens the contact time between the moving contact and the conductive arm, reducing the burden on the vacuum tube (too long a continuous contact discharge time will cause the vacuum tube to burn out), and achieving faster and safer breaking. Furthermore, in the technical solution defined in the sovereign claim, the conductive arm is equipped with a bidirectional swing reset mechanism. The bidirectional swing reset mechanism causes the conductive arm to be subjected to elastic restoring forces from two different torsion springs in the clockwise and counterclockwise swing directions around the cam mounting shaft, respectively. Compared with the traditional structure that only a single torsion spring provides elastic restoring forces in both directions, the bidirectional swing reset mechanism in this application can maintain the position of the conductive arm more stably, provide a stronger restoring force, further shorten the time for the moving contact to touch the conductive arm, further improve the speed of the disconnection operation, and enhance safety.

[0014] II. The bidirectional swing reset mechanism of the conductive arm of this application includes a reset torsion spring, a limiting torsion spring, and a synchronous crank arm. The actuating part of the limiting torsion spring presses down on the pressure groove of the synchronous crank arm. A blocking shaft for blocking the actuating part is provided on the mounting bracket in the lateral direction corresponding to the limiting torsion spring. The above structure allows the limiting torsion spring to apply greater force, so that the synchronous crank arm can be tightly pressed on the pressure groove of the synchronous crank arm. Because the limiting torsion spring is rigidly blocked by the blocking shaft, under the premise of rationality, no matter how much force the limiting torsion spring applies, it can be borne by the blocking shaft without pressure, thereby increasing the upper limit of the force of the limiting torsion spring, that is, increasing the force of elastic locking of the conductive arm, further improving the stability of the conductive arm in the setting position when it is not subjected to external force, and further preventing the conductive arm from shaking.

[0015] Third, a stable force transmission chain is formed through the cam transmission mechanism. By utilizing the cooperation of the cam, conductive arm, and linkage shaft, as well as the drive assembly consisting of synchronously rotating left and right transmission crank arms, connecting shafts, and connecting rods, the operating force is ensured to be smoothly and accurately transmitted to the vacuum interrupter, guaranteeing the consistency and reliability of the opening and closing actions. The vacuum interrupter is used as the arc-extinguishing unit, inheriting its inherent advantages of strong arc-extinguishing capability and long service life. At the same time, the stationary contact is fixed to the mechanism frame and extends out to connect with the moving contact of the isolating knife assembly, forming a stable and reliable main circuit connection path. The reset torsion spring provides automatic reset torque for the first conductive arm, the second conductive arm, and the linkage shaft in the cam transmission mechanism, which is conducive to rapid opening.

[0016] Fourth, the cam transmission mechanism in this application adopts a mounting bracket to integrate the transmission component and the drive component. This not only greatly facilitates production assembly and maintenance, but also ensures the long-term stability of the mechanism through the clear separation and high-precision integration of functional components.

[0017] Furthermore, the transmission assembly adopts a double-sided conductive arm structure rigidly connected by a linkage shaft, achieving symmetrical and balanced driving of the stationary contact, ensuring uniform and stable contact pressure in the main circuit, and improving current-carrying performance. The drive assembly, through synchronously rotating left and right transmission crank arms and linkage crank arm groups, creates a double-sided balanced and highly rigid power input structure, eliminating unilateral drive bias and providing a central and pure driving force for the vacuum interrupter. Attached Figure Description

[0018] The present invention includes the following figures: Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the switch assembly according to Embodiment 1 of the present invention.

[0020] Figure 3This is an exploded view of the switch assembly in Embodiment 1 of the present invention.

[0021] Figure 4 This is a schematic diagram of the transmission component structure of Embodiment 1 of the present invention.

[0022] Figure 5 This is a schematic diagram of the driving component structure of Embodiment 1 of the present invention.

[0023] Figure 6 This is a schematic diagram of the limiting torsion spring structure of the mounting bracket in Embodiment 1 of the present invention.

[0024] Figure 7 This is a schematic diagram of the isolation blade assembly structure of Embodiment 1 of the present invention.

[0025] Figure 8 This is a schematic diagram of the closed state structure of Embodiment 1 of the present invention.

[0026] Figure 9 This is a schematic diagram of the circuit breaker opening process in Embodiment 1 of the present invention.

[0027] Figure 10 This is a schematic diagram of the state structure after the circuit breaker is tripped according to Embodiment 1 of the present invention.

[0028] Figure 11 yes Figure 6 The diagram shows the structural relationship between the mounting bracket, the synchronizing crank arm, the blocking shaft, and the limiting torsion spring, with a focus on showing one end of the limiting torsion spring pressing on the synchronizing crank arm and the blocking shaft.

[0029] Figure 12 This is a schematic diagram of the contact state between the conductive toggle end, which is the same width as the main body, and the conductive arm, where the conductive toggle end also maintains contact with the conductive arm at the rear end.

[0030] Figure 13 This is a schematic diagram of the contact state between the conductive toggle end and the conductive arm in this patent, wherein the conductive toggle end has detached from the contact with the conductive arm at the rear. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] Reference Figure 1-13As shown, Embodiment 1 of the present invention provides a high-current load switch, characterized in that: it includes a frame 1, on which a switch assembly 2 and a crank arm connecting assembly 3 are disposed. The switch assembly 2 includes a vacuum interrupter 21, a cam transmission mechanism 22 for driving the vacuum interrupter 21, and a stationary contact 23 electrically connected to the vacuum interrupter 21. The stationary contact 23 is fixedly mounted on the frame 1 and has a connecting portion 231 extending toward the cam transmission mechanism 22. The crank arm connecting assembly 3 is provided with a crank arm connecting sleeve 31 and an isolating blade assembly 32. The moving contact 321 of the isolating blade assembly is connected to the stationary contact 23 in the closed position. 231 is electrically connected and disconnected from the connection part of the stationary contact 23 in the open position. The cam transmission mechanism 22 includes a mounting bracket 221 and a transmission component 4 and a drive component 5 mounted on the mounting bracket 221. The transmission component 4 includes a cam mounting shaft 41 mounted between the mounting brackets 221. A conductive arm is mounted on the cam mounting shaft 41. The conductive arm includes a first conductive arm 42 and a second conductive arm 43 located on both sides of the top end of the stationary contact connection part. The first conductive arm 42 and the second conductive arm 43 are connected by a linkage shaft 45. The cam 44 is located between the first conductive arm 42 and the second conductive arm 43. The cam 44 is actually a pusher with a protrusion. The conductive arm is equipped with a bidirectional swing reset mechanism, which causes the conductive arm to be subjected to elastic restoring force in both the clockwise and counterclockwise swing directions around the cam mounting shaft 41. The upper end of the moving contact has a conductive actuating end 3211. During the bidirectional swing of the moving contact, the conductive arm is actuated by the conductive actuating end 3211. After the conductive arm swings past the contact apex in both directions, it elastically returns in the opposite direction. The width of the conductive actuating end 3211 at the upper end of the moving contact 321 is less than two-thirds of the width of the main body of the moving contact 321. Within this range, the contact time between the moving contact and the conductive arm during breakage can be significantly shortened. In practical applications, the width of the conductive actuating end 3211 at the upper end of the moving contact 321 is half the width of the main body of the moving contact 321. The moving contact 321 has a partition groove 3212 on the upper part and a circular mounting groove 3213 below the partition groove. The conductive actuating end 3211 is the outer end formed by the partition groove 3212 on the moving contact 321 (the outer side is the direction of the moving contact separating from the stationary contact). The front and rear contact angles of the conductive actuating end 3211 are both significantly chamfered.

[0033] Reference Figure 2-4As shown in Figures 6 and 8-11, the bidirectional swing reset mechanism includes a reset torsion spring 6, a limiting torsion spring 721, and a synchronous crank arm 7. The limiting torsion spring 721 is mounted on the limiting torsion spring mounting shaft 72. The reset torsion spring 6 is mounted on the cam mounting shaft 41. One end of the reset torsion spring 6 is connected to the mounting bracket 221, and the other end presses against the outside of the conductive arm. The reset torsion spring 6 applies an inward swinging restoring force to the conductive arm. The synchronous crank arm 7 is fixed to the outer end of the cam mounting shaft 41 and swings synchronously with it. One end of the limiting torsion spring 721 is connected to the mounting bracket 221 and is located outside the mounting bracket 221. The other end has a toggle part, which presses down on the pressure groove 71 of the synchronous crank arm 7 from top to bottom. The mounting bracket 221 is provided with a blocking shaft 73 in the lateral direction corresponding to the limiting torsion spring 721 to block the toggle part.

[0034] Reference Figure 1-4 As shown, the drive assembly 5 includes a crank arm drive shaft mounted between the mounting brackets 221. A left drive crank arm 52 and a right drive crank arm 53, which are capable of synchronous rotation, are rotatably mounted on the crank arm drive shaft. The free ends of the left drive crank arm 52 and the right drive crank arm 53 are connected by a connecting shaft 54 ​​to form a linkage crank arm group. The linkage crank arm group is provided with a drive connecting shaft 55. A connecting rod 56 located between the left drive crank arm 52 and the right drive crank arm 53 is connected to the drive connecting shaft 55. The connecting rod 56 is drivenly connected to the vacuum interrupter 21.

[0035] Reference Figure 1-5 As shown, a first braided flexible connection 8 is connected to the connecting rod 56, and a second braided flexible connection 9 is connected to the cam mounting shaft 41. The first braided flexible connection 8 and the second braided flexible connection 9 are electrically connected. The crank arm connecting sleeve 31 is a cylindrical structure with an internal isolation blade cavity. The isolation blade assembly 32 is rotatably mounted on the mechanism frame 1 and fixedly connected to the crank arm connecting sleeve 31. The isolation blade assembly 32 includes a moving contact bracket 322 and moving contacts 321 fixed on both sides of the moving contact bracket 322. The moving contacts 321 pass through the isolation blade cavity and extend to the outside of the crank arm connecting sleeve 31 through vertical distribution. Through the flexible connection of the first braided flexible connection 8 and the second braided flexible connection 9, the mechanical motion stress and electrical connection are decoupled, significantly improving the current carrying stability and contact reliability of the main circuit under frequent operation. Moreover, the moving contact 321 of the isolating knife assembly 32 is housed in the cylindrical crank arm connecting sleeve 31, which provides good protection and guidance. Its design of being fixed on both sides and extending up and down forms a double-break isolation, which greatly improves the insulation safety and reliability after the switch is opened.

[0036] The working principle of the technical solution shown in Embodiment 1 of the present invention is described in detail below: During the closing operation, the external operating force drives the crank arm connecting sleeve 31 to rotate, which in turn drives the isolating knife assembly 32 and its moving contact 321 to move toward the closing position. The movement trajectory of the moving contact 321 first contacts and pushes the first conductive arm 42 and the second conductive arm 43, which are in the open position, forcing the rigid assembly composed of the first conductive arm 42, the second conductive arm 43 and the linkage shaft 45 to overcome the resistance of the reset torsion spring 6 and deflect around the cam mounting shaft 41 in the closing direction. During this process, the synchronous crank arm 7 swings synchronously with the first conductive arm 42 and the second conductive arm 43. The synchronous crank arm 7 lifts the actuating part of the limit torsion spring 721. The limit torsion spring 721 moves upward away from the blocking shaft 73 and is tightened synchronously. When the moving contact 321 continues to swing inward past the contact vertex with the outer side of the conductive arm, the conductive arm disengages from the contact with the moving contact 321. Under the action of the limit torsion spring 721, it swings outward quickly away from the moving contact and is on its outer side, and returns to the initial position. At this time, the moving contact 321 and the stationary contact 23 complete the closing. When tripping is required, the moving contact 321 is driven to swing outward, during which it touches the conductive arm, causing the conductive arm to swing outward. During the outward swing of the conductive arm, the reset torsion spring 6 tightens and stores energy. When the moving contact 321 continues to swing outward past the contact apex with the inner side of the conductive arm, the conductive arm disengages from the contact with the moving contact. Under the reset action of the reset torsion spring 6, it quickly swings inward to disengage from the moving contact and is located inside it. This process completes the tripping. During the tripping process, the vacuum interrupter 21 is triggered when the moving contact 321 is in conductive contact with the conductive arm. Because this application uses a smaller conductive toggle end 3211 to push and contact the moving contact 321, the contact distance is shortened, and the arc extinguishing can be completed more safely and quickly. In the above-mentioned opening operation, the moving contact pushes the conductive arm, and the conductive arm indirectly drives the vacuum interrupter 21 to quickly separate. In the vacuum environment, the load current is extinguished first and the arc is extinguished. Since the vacuum interrupter 21 has undertaken the task of arc extinguishing, this isolation break is separated under arc-free conditions, forming an electrical isolation break.

[0037] Reference Figure 1-4 As shown, Embodiment 2 of the present invention is basically the same as Embodiment 1, except that the bidirectional swing reset mechanism in Embodiment 2 does not have a blocking shaft 73. The conductive arm stops at a position where the reset torsion spring 6 and the limiting torsion spring 721 work together to reach a force balance point. Due to the bidirectional action of the reset torsion spring 6 and the limiting torsion spring 721, the position of the conductive arm is more stable and will not easily shake. However, its effect is weaker than the technical solution of Embodiment 1.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. The above preferred embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-current load switch, characterized in that: The device includes a frame (1), on which a switch assembly (2) and a crank arm connecting assembly (3) are mounted. The switch assembly (2) includes a vacuum interrupter (21), a cam drive mechanism (22) for driving the vacuum interrupter (21), and a stationary contact (23) electrically connected to the vacuum interrupter (21). The stationary contact (23) is fixedly mounted on the frame (1) and has a connecting portion (231) extending toward the cam drive mechanism (22). The crank arm connecting assembly (3) contains a crank arm connecting sleeve (31) and an isolating knife assembly (32). The moving contact (321) of the isolating knife assembly is electrically connected to the connecting portion (231) of the stationary contact (23) in the closed position and separated from the connecting portion of the stationary contact (23) in the open position. The cam drive mechanism (22) includes... The device includes a mounting bracket (221) and a transmission assembly (4) and a drive assembly (5) mounted on the mounting bracket (221). The transmission assembly (4) includes a cam mounting shaft (41) mounted between the mounting brackets (221). A conductive arm is mounted on the cam mounting shaft (41). The conductive arm is equipped with a bidirectional swing reset mechanism. The bidirectional swing reset mechanism causes the conductive arm to be subjected to elastic restoring force in both clockwise and counterclockwise swing directions around the cam mounting shaft (41). The upper end of the moving contact has a conductive actuating end (3211). During the bidirectional swing of the moving contact, the conductive arm is actuated by the conductive actuating end (3211). After the conductive arm swings past the contact vertex in both directions, it elastically returns in the opposite direction. The width of the conductive actuating end (3211) at the upper end of the moving contact (321) is less than two-thirds of the width of the main body of the moving contact (321).

2. The high-current load switch according to claim 1, characterized in that: The conductive arm includes a first conductive arm (42) and a second conductive arm (43) located on both sides of the top of the stationary contact connection portion. The first conductive arm (42) and the second conductive arm (43) are connected by a linkage shaft (45), and the cam (44) is located between the first conductive arm (42) and the second conductive arm (43).

3. The high-current load switch according to claim 1 or 2, characterized in that: The width of the conductive actuating end (3211) at the upper end of the moving contact (321) is half the width of the main body of the moving contact (321).

4. The high-current load switch according to claim 3, characterized in that: The moving contact (321) has a partition groove (3212) on its upper part and a circular mounting groove (3213) below the partition groove (3212). The conductive toggle end (3211) is the outer end formed by the partition groove (3212) on the moving contact. The front and rear contact angles of the conductive toggle end (3211) are both significantly chamfered.

5. The high-current load switch according to claim 1 or 2, characterized in that: The bidirectional swing reset mechanism includes a reset torsion spring (6), a limiting torsion spring (721), and a synchronous crank arm (7). The reset torsion spring (6) is mounted on the cam mounting shaft (41). One end of the reset torsion spring (6) is connected to the mounting bracket (221), and the other end is pressed against the outside of the conductive arm. The reset torsion spring (6) applies an inward swing restoring force to the conductive arm. The synchronous crank arm (7) is fixed to the outer end of the cam mounting shaft (41) and swings synchronously. One end of the limiting torsion spring (721) is connected to the mounting bracket (221) and is located outside the mounting bracket (221). The other end has a toggle part. The toggle part presses down on the pressure groove (71) of the synchronous crank arm (7) from top to bottom. The mounting bracket (221) is provided with a blocking shaft (73) in the transverse direction corresponding to the limiting torsion spring (721) to block the toggle part.

6. The high-current load switch according to claim 4, characterized in that: The bidirectional swing reset mechanism includes a reset torsion spring (6), a limiting torsion spring (721), and a synchronous crank arm (7). The reset torsion spring (6) is mounted on the cam mounting shaft (41). One end of the reset torsion spring (6) is connected to the mounting bracket (221), and the other end is pressed against the outside of the conductive arm. The reset torsion spring (6) applies an inward swing restoring force to the conductive arm. The synchronous crank arm (7) is fixed to the outer end of the cam mounting shaft (41) and swings synchronously. One end of the limiting torsion spring (721) is connected to the mounting bracket (221) and is located outside the mounting bracket (221). The other end has a toggle part. The toggle part presses down on the pressure groove (71) of the synchronous crank arm (7) from top to bottom. The mounting bracket (221) is provided with a blocking shaft (73) in the transverse direction corresponding to the limiting torsion spring (721) to block the toggle part.

7. The high-current load switch according to claim 1 or 2, characterized in that: The drive assembly (5) includes a crank arm drive shaft mounted between mounting brackets (221). A left drive crank arm (52) and a right drive crank arm (53) capable of synchronous rotation are rotatably mounted on the crank arm drive shaft. The free ends of the left drive crank arm (52) and the right drive crank arm (53) are connected by a connecting shaft (54) to form a linkage crank arm group. The linkage crank arm group is provided with a drive connecting shaft (55). A connecting rod (56) located between the left drive crank arm (52) and the right drive crank arm (53) is connected to the drive connecting shaft (55). The connecting rod (56) is drivenly connected to the vacuum interrupter (21).

8. The high-current load switch according to claim 7, characterized in that: The connecting rod (56) is connected to a first braided flexible connection (8), and the cam mounting shaft (41) is connected to a second braided flexible connection (9). The first braided flexible connection (8) and the second braided flexible connection (9) are electrically connected.

9. The high-current load switch according to claim 1 or 2, characterized in that: The crank arm connecting sleeve (31) is a cylindrical structure with an internal isolation blade cavity. The isolation blade assembly (32) is rotatably mounted on the mechanism frame (1) and fixedly connected to the crank arm connecting sleeve (31). The isolation blade assembly (32) includes a moving contact bracket (322) and moving contacts (321) fixed on both sides of the moving contact bracket (322). The moving contacts (321) pass through the isolation blade cavity and extend out to the outside of the crank arm connecting sleeve (31) through vertical distribution.

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