Operating mechanism and switch device

Abstract

This disclosure discloses an operating mechanism, including an operating handle that moves between a disengaged position and a closed position. The operating handle includes operating teeth and a locking portion. A drive assembly includes a drive toothed portion configured to engage with the operating teeth such that when the operating handle moves to the disengaged position, the operating handle drives the drive assembly to the disengaged state, and when the operating handle moves to the closed position, the operating handle drives the drive assembly to the closed state. The drive assembly also includes a positioning lever. A locking member moves between a locked position and an unlocked position. In the locked position, the locking member locks the locking portion to prevent the operating handle from moving from the closed position to the disengaged position. In the unlocked position, the locking member disengages from the locking portion to allow the operating handle to move. The locking member and the positioning lever cooperate such that when the drive assembly is in the closed state, the positioning lever positions the locking member in the locked position, and when the drive assembly is in the disengaged state, the locking member is in the unlocked position.

Description

Technical Field

[0001] This disclosure relates to the electrical field, and more particularly to an operating mechanism and a switching device including the operating mechanism. Background Technology

[0002] The precharge switch controls the opening and closing of the precharge resistor, allowing the current to rise slowly through the resistor when high voltage is applied. This prevents damage to the system from the instantaneous high current generated when the switch is closed directly. The use of a precharge switch can effectively extend the lifespan of components such as motor controllers and battery systems. By limiting the current surge at the moment of power-on, the precharge resistor avoids the risk of damage to capacitors and relays, thereby improving the stability and safety of the entire system.

[0003] To save costs and provide more comprehensive protection, the applicant proposed integrating the functions of the pre-charge switch group and the main switch group into a single product, such as forming a fused switch. However, to achieve the required protection functions, the main switch group and the pre-charge switch group may need to operate in a specific sequence. Therefore, when designing the fused switch, in addition to the main switch group's securitization (secto), the securitization design of the pre-charge switch group must also be considered. That is, when the pre-charge switch group undergoes fusion welding, it must be able to withstand three times or more of the opening operating force while ensuring the accuracy of the indication to prevent safety accidents caused by erroneous indications.

[0004] Therefore, an operating mechanism is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this disclosure is to at least address the shortcomings of existing technologies. This disclosure proposes an operating mechanism including a housing; an operating handle pivotally mounted to the housing for movement between an open position and a closed position, the operating handle including operating teeth and a locking portion; a drive assembly including a drive toothed portion configured to engage with the operating teeth such that, when the operating handle moves to the open position, the operating handle drives the drive assembly to the open state, and when the operating handle moves to the closed position, the operating handle drives the drive assembly to the closed state, the drive assembly further comprising a positioning lever; and a locking member mounted to the housing for movement between a locked position and an unlocked position, wherein, in the locked position, the locking member locks the locking portion to prevent the operating handle from moving from the closed position to the open position, and in the unlocked position, the locking member disengages from the locking portion to allow movement of the operating handle. The locking element and the positioning rod cooperate to position the locking element in the locking position when the driving component is in the closed state, and to position the locking element in the unlocked position when the driving component is in the open state.

[0006] For example, according to some embodiments of this disclosure, when the drive assembly is capable of switching between the open and closed states, the operation handle requires a tripping force to move from the closed position to the open position; when the drive assembly is held in the closed state due to welding, the locking element is capable of resisting at least three times the tripping force to prevent the operation handle from moving from the closed position to the open position.

[0007] For example, according to some embodiments of this disclosure, the locking member is pivotally mounted to the housing and is provided with a biasing member to bias the locking member in the unlocked position.

[0008] For example, according to some embodiments of this disclosure, the locking member includes a first arm and a second arm, the first arm being rotatable by the positioning rod, such that a locking protrusion provided on the second arm extends into the movement path of the locking part, thereby preventing the operating handle from moving from the closed position to the open position.

[0009] For example, according to some embodiments of this disclosure, the included angle between the first arm and the second arm is configured such that, during the movement of the operating handle from the open position to the closed position, after the locking part passes the locking protrusion, the locking protrusion extends into the movement path of the locking part.

[0010] This disclosure also proposes a switching device, including the operating mechanism described in any of the foregoing embodiments; a main switch group capable of switching between closed and open states; and a pre-charging circuit connected in parallel with the main switch group, the pre-charging circuit including a pre-charging switch group and a pre-charging resistor connected in series. The pre-charging switch group is operated by the operating mechanism such that when the driving component is in the closed state, the pre-charging switch group is closed, and when the driving component is in the open state, the pre-charging switch group is open.

[0011] For example, according to some embodiments of this disclosure, the main switch group can be operated by the operating handle to switch between closed and open, the operating handle being able to indicate the state of the switching device, the operating handle being in the open position when both the main switch group and the precharge switch group are open; and the operating handle being in the closed position when at least one of the main switch group and the precharge switch group is closed.

[0012] For example, according to some embodiments of this disclosure, when the precharge switch assembly is welded, the drive assembly remains in the closed state, and the locking element prevents the operating handle from moving from the closed position to the open position.

[0013] For example, according to some embodiments of this disclosure, the precharge moving contact of the precharge switch assembly is fixed on the positioning rod.

[0014] For example, according to some embodiments of this disclosure, the switching device is a fusion circuit breaker. Attached Figure Description

[0015] Figure 1 A schematic circuit diagram showing the connection relationship between the main switch group and the pre-charging circuit of a switching device according to an embodiment of the present disclosure;

[0016] Figure 2 A perspective view of the operating mechanism according to an embodiment of the present disclosure is shown;

[0017] Figure 3 Another perspective view of the operating mechanism according to an embodiment of the present disclosure is shown, wherein the operating handle is hidden to expose the complete locking element;

[0018] Figures 4a-4c A plan view showing the movement of the operating handle of the operating mechanism according to this disclosure from the open position to the closed position, wherein, Figure 4a The diagram shows the operating tooth and the toothed part of the drive belt in contact, with the drive assembly in the disconnected state. Figure 4b The diagram shows the operating teeth and the toothed part of the drive belt engaged, with the drive assembly in a state between open and closed. Figure 4c The operating teeth and the drive belt teeth are separated, and the drive assembly is in the closed state;

[0019] Figures 5a-5c A partial enlarged cross-sectional view showing the mating relationship between the locking element and the locking part of the operating mechanism according to this disclosure is shown, wherein, Figure 5a This shows the position of the operating handle between the open and closed positions. Figure 5b The operating handle is shown in the closed position. Figure 5c This shows the state of the precharge switch assembly during welding.

[0020] Figure 6a and Figure 6b This diagram shows a plan view of the operating mechanism in a welded state according to an embodiment of the present disclosure. Figure 6a The meshing of the operating teeth and the drive belt teeth is shown. Figure 6b The diagram shows the dislodging of the operating teeth and drive belt teeth due to the elastic deformation of the operating mechanism.

[0021] Figure Labels

[0022] 1. Shell,

[0023] 2. Operating handle, 21. Operating teeth, 22. Locking part.

[0024] 31 First lever, 32 Second lever, 33 Third lever, 34 Drive toothed part, 35 Positioning lever, 4 Locking element, 41 First arm, 42 Second arm, 43 Third arm, 44 Locking protrusion, 45 Offset element, 51 Main switch assembly, 52 Pre-charge resistor, 53 Pre-charge switch assembly, 531 Pre-charge moving contact, 532 Pre-charge stationary contact Detailed Implementation

[0025] To make the objectives, solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0026] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0027] This disclosure discloses an operating mechanism and a switching device including the operating mechanism, the switching device including a main switch group 51 and a precharge switch group 53, particularly as follows: Figure 1 As shown, the main switch group 51 and the precharge switch group 53 are connected in parallel. This operating mechanism can be used to operate both the main switch group 51 and the precharge switch group 53. Specifically, the operating mechanism includes an operating handle 2, such as... Figure 2 As shown, the operating handle 2 is pivotally mounted to the housing 1, and the pivoting movement of the operating handle 2 causes the main switch group and the precharge switch group to close and open. In particular, the operating handle 2 can be operated not only manually (pivoting movement) but also automatically by an electric device (not shown).

[0028] The operating handle 2 can also be configured to move between an open position and a closed position. When the operating handle 2 is in the open position, the entire switching device is open, that is, both the main switch group 51 and the precharge switch group 53 are open; when the operating handle 2 is in the closed position, the entire switching device is closed, that is, at least one of the main switch group 51 and the precharge switch group 53 is closed. Thus, the on / off state of the switching device can be indicated by the position of the operating handle 2.

[0029] However, in some special circumstances, the indication of the operating handle 2 may be inaccurate. For example, the operating handle 2 may be in the open position, but the switch device is actually closed, which could lead to a safety accident. The situation where the moving and stationary contacts are welded together falls under this category. In this case, because the moving and stationary contacts are solidified by welding, if the operating handle 2 is forcibly moved from the closed position to the open position, although the moving contact cannot move, the intermediate transmission mechanism connecting the operating handle and the moving contact may, due to deformation or other reasons, allow the operating handle to move to the open position, which could potentially lead to a safety accident.

[0030] To address this, a secreto design is required. This means that when the switch assembly of the switching device undergoes welding, it must be able to withstand three times or more of the normal operating force required for tripping. In other words, when a tripping force of less than three times is applied to the operating handle, the operating handle cannot move to the open position. The switching device according to this disclosure includes a main switch assembly and a precharge switch assembly. Therefore, a secreto design is required not only for the main switch assembly but also for the precharge switch assembly. This secreto design is achieved through the operating mechanism according to this disclosure.

[0031] Specifically, the operating handle 2 of the operating mechanism according to this disclosure can drive the driving component of the operating mechanism. The driving component can be connected to the pre-charge contact 531. For example, the pre-charge contact 531 can be driven by the third rod 33 of the driving component. Figure 2 As shown, the pre-charge moving contact 531 and the pre-charge stationary contact 532 can be brought into contact or separated by driving the drive assembly. In particular, when the drive assembly can switch between an open state and a closed state, in the open state, the drive assembly causes the pre-charge moving contact 531 and the pre-charge stationary contact 532 to separate, and in the closed state, the drive assembly causes the pre-charge moving contact 531 and the pre-charge stationary contact 532 to make contact.

[0032] The operating handle 2 can drive the drive assembly via the operating teeth 21 on the operating handle 2 and the drive teeth 34 on the drive assembly. Specifically, as shown... Figure 2 and Figures 4a-4c As shown, the operating teeth 21 and the drive belt teeth 34 can mesh and separate from each other. When the operating teeth 21 and the drive belt teeth 34 are separated, the movement of the operating handle 2 is independent of the movement of the drive assembly. When the operating teeth 21 and the drive belt teeth 34 are meshed, the movement of the operating handle 2 and the movement of the drive assembly can be mutually transmitted and converted.

[0033] Therefore, the operating tooth 21 and the drive belt toothed portion 34 may each include one or more teeth, for example, such as Figure 3 As shown, the operating tooth 21 can be a single tooth, while the drive belt toothed portion 34 can include two teeth to enable motion transmission in two opposite directions, for example... Figures 4a to 4c The transmission and converse of the motion process Figures 4c to 4a The transmission of motion.

[0034] Specifically, the drive toothed portion 34 is configured to engage with the operating tooth 21 so that the operating handle 2 moves to the disengaged position (not shown in the figure). Figure 4a When the position of the operating handle 2 is upstream in the counterclockwise direction (as shown), the operating handle 2 drives the drive assembly to the disconnected state (e.g., Figure 4a As shown), this causes the operating handle to move to the closed position (as shown). Figure 4c When (as shown), the operating handle 2 drives the drive assembly to the closed state (as shown). Figure 4c (As shown).

[0035] The drive component can be, for example, a four-bar linkage structure, such as... Figure 4a As shown by the dashed line. The drive assembly includes, for example, a first rod 31, a second rod 32, and a third rod 33, wherein the first rod 31 and the third rod 33 are not adjacent. The drive toothed portion 34 can be fixed to the first rod 31 to rotate synchronously with the first rod 31.

[0036] Figures 4a to 4c A plan view showing the movement of the operating handle of the operating mechanism according to this disclosure from the open position to the closed position, wherein, Figure 4a The diagram shows an intermediate position during the movement of the operating handle from the open position to the closed position. In this position, the operating tooth 21 just contacts the drive belt tooth 34, and the drive assembly is still in the open state. Figure 4b The diagram shows another intermediate position during the movement of the operating handle from the open position to the closed position, which is closer to the closed position. In this position, the operating tooth 21 and the drive belt tooth 34 mesh and drive the drive belt tooth 34 to rotate a certain angle, causing the drive assembly to be in a state between the open and closed states. Figure 4c The operating handle 2 is shown to be moved to the closed position, the operating teeth 21 and the drive belt teeth 34 are separated, the drive assembly is in the closed state, and the pre-charge moving contact 531 and the pre-charge stationary contact 532 are in contact.

[0037] When the pre-charge moving contact 531 and the pre-charge stationary contact 532 are fused together, although the drive assembly is locked due to the four-bar linkage structure, the teeth of the operating tooth 21 and the toothed part of the drive 34 may not be able to withstand large external forces and may disengage. Furthermore, the four-bar linkage structure can also elastically deform, applying a large force (e.g., twice the opening operating force) to the operating handle 2 to forcibly operate it, thus moving the operating handle 2 to the open position. The opening operating force refers to the operating force required to move the operating handle from the closed position to the open position when the drive assembly can switch between the open and closed states (i.e., the pre-charge moving contact 531 and the pre-charge stationary contact 532 can normally contact and separate).

[0038] Therefore, the drive assembly may also include a positioning lever 35, which may have an arm extending toward the locking member described later. During movement of the drive assembly, the positioning lever 35 is moved to position the locking member 4 described later. For example, the positioning lever 35 may be mounted to the third lever 33, for example, it may be fixedly connected to the third lever 33 as a single unit, or as... Figure 3 As shown, it pivots coaxially with the third rod 33 and can be pivoted by the third rod 33. Furthermore, the pre-charge contact 531 can be fixedly mounted to the positioning rod 35, for example, fixedly mounted to another arm of the positioning rod 35, such as... Figure 3 As shown. Since the positioning rod 35 is installed on the third rod 32 which is not adjacent to the first rod 31, the positioning rod 35 can have a large pivot angle, which is beneficial for the separation of the precharge moving contact 531 and the precharge stationary contact 532.

[0039] The operating mechanism also includes a locking element 4, which is mounted to the housing 1, for example, pivotally mounted to the housing 1, so as to be in the locking position ( Figure 5b and 5c (as shown) and unlock location ( Figure 5a The locking member 4 may be provided with a locking protrusion 44 to cooperate with the locking part 22 provided on the operating handle 2 to block the movement of the operating handle 2. Specifically, as shown... Figure 5b and 5c As shown, in the locking position, the locking protrusion 44 of the locking member 4 is located in the movement path of the locking part 22. When the operating handle 2 moves from the closed position to the open position, that is, from... Figure 5b Position moved to Figure 5c When the operating handle 2 is in the closed position, the locking protrusion 44 of the locking member 4 locks the locking part 22 to prevent the operating handle 2 from moving from the closed position to the open position; when the operating handle 2 is in the unlocked position, the locking protrusion 44 of the locking member 4 moves away from the movement path of the locking part 22, and the locking member 4 separates from the locking part 22 to allow the operating handle to move between the closed position and the open position.

[0040] The locking element 4 can be switched between the locked and unlocked positions via the aforementioned positioning lever 35, such as... Figure 4a and Figure 4c As shown, the locking element 4 and the positioning rod 35 cooperate to position the locking element 4 in the locking position when the drive assembly is in the closed state, as shown. Figure 4c As shown; when the drive component is in the disconnected state, the locking element 4 is in the unlocked position, as indicated. Figure 4a As shown.

[0041] Specifically, such as Figure 3 As shown, the locking element 4 may include a first arm 41 and a second arm 42. The extension length and angle of the first arm 41 are configured to be operable by the positioning rod 35, such as... Figures 4a to 4cThe process is shown below. The aforementioned latch protrusion 44 can be provided on the second arm 42, which can be angled relative to the first arm 41. For example, the second arm 42 extends toward the locking part 22, and the latch protrusion 44 protrudes laterally from the second arm 42. When the first arm 41 is turned to the latch position by the positioning lever 35, the latch protrusion 44 on the second arm 42 extends into the movement path of the locking part 22, thereby preventing the operating handle 2 from moving from the closed position to the open position.

[0042] Figure 6a and Figure 6b This illustrates the different states of the operating mechanism when the pre-charge moving contact 531 and the pre-charge stationary contact 532 are welded together. For example... Figure 6a and Figure 6b As shown, the precharge moving contact 531 and the precharge stationary contact 532 are fixed together by welding, and the drive assembly is locked by a four-bar linkage structure. Figure 6a This shows that the operating teeth and the drive belt teeth are properly engaged. Figure 6b This illustrates how, in order to further move the operating handle toward the disengaged position, Figure 6a When force is forcibly applied to the operating handle, at least some of the operating teeth and drive belt teeth disengage due to the elastic deformation of the operating mechanism. Since the positioning lever 35 places the locking member 4 in the locked position, the locking member 4 locks the movement of the operating handle 2, preventing it from moving towards the open position. Therefore, even if the operating teeth 21 and drive belt teeth 531 disengage, the locking member 44 can resist at least three times the opening operating force to prevent the operating handle 2 from moving from the closed position to the open position.

[0043] Because the pre-charge contact 531 is fixedly installed to the positioning rod 35, the positioning rod 35 can be held more securely. Figure 6a The state shown in Figure b is such that the locking element 4 is securely held in the locked position, thereby more reliably locking the movement of the operating handle 2 and preventing it from moving toward the disengaged position.

[0044] Furthermore, combined Figures 4a-4c As shown, the included angle between the first arm and the second arm is set such that, during the movement of the operating handle 2 from the open position to the closed position, after the locking part passes the locking protrusion (from... Figure 4a Position moved to Figure 4b (Position), the latching protrusion 44 extends into the movement path of the locking part 22. This ensures that locking will not occur during normal operation of the operating mechanism.

[0045] Furthermore, the locking element 4 may also be provided with an offsetting element 45, which is provided, for example, on the third arm of the locking element 4, to offset the locking element 4 in the unlocked position. Thus, without being set or turned by the setting lever 35, the locking element 4 automatically returns to the unlocked position, without affecting the movement of the operating handle 2.

[0046] This disclosure also proposes a switching device, such as a fused circuit breaker, comprising an operating mechanism according to this disclosure, capable of switching a main switch group 51 between closing and opening, and a pre-charging circuit. The pre-charging circuit is connected in parallel with the main switch group 51 and includes a pre-charging switch group 53 and a pre-charging resistor 52 connected in series, such as... Figure 1 As shown, this eliminates the need for a manual disconnect switch, and since the precharge switch group and the main switch group are connected in parallel, the precharge switch group and the main switch group jointly undertake the function of circuit isolation, making full use of the precharge circuit protection function.

[0047] In particular, the precharge switch group 53 is operated by an operating mechanism. For example, as described above, the precharge moving contact 531 of the precharge switch group 53 is fixedly mounted on the positioning rod 35 of the drive assembly, so that the precharge switch group is closed when the drive assembly is in the closed state and open when the drive assembly is in the open state. Furthermore, the main switch group 51 can also be operated by the operating handle 2 to switch between closed and open states, which can be achieved through another existing transmission mechanism, which will not be elaborated here.

[0048] Furthermore, according to the switching device of this disclosure, due to the provision of a pre-charging circuit, the pre-charging switch group 53 and the main switch group 51 can also be operated in a specific sequence. When the operating handle 2 moves from the open position to the closed position, the pre-charging switch group 53 closes first, the pre-charging circuit is turned on, and the pre-charging resistor 52 performs load-limited current closing. Afterwards, the main switch group 51 closes and short-circuits the pre-charging circuit. Then, the pre-charging switch group 53 opens, and the pre-charging circuit is disconnected without load. If pre-charging fails after the pre-charging switch group 53 closes, the circuit can be opened by operating the operating handle 2, that is, by moving the operating handle 2 from the closed position to the open position, causing the pre-charging switch group 53 to open and perform load-opening.

[0049] According to the operating mechanism of this disclosure, the operating handle 2 can indicate the state of the switching device. When both the main switch group 51 and the precharge switch group 53 are open, the operating handle 2 is in the open position; when at least one of the main switch group 51 and the precharge switch group 53 is closed, the operating handle 2 is in the closed position.

[0050] Specifically, as described above, during the welding of the precharge switch assembly 53, the drive assembly remains in the closed state, and the positioning lever 35 positions the locking member 4 in the locking position. The locking member 4 locks the movement of the operating handle 2, preventing it from moving towards the open position. Thus, even if the operating teeth 21 and the drive toothed portion 531 disengage, the locking member 44 can resist at least three times the opening operation force to prevent the operating handle 2 from moving from the closed position to the open position.

[0051] Because the pre-charge contact 531 is fixedly installed to the positioning rod 35, the positioning rod 35 can be held more securely. Figure 6a The state shown in Figure b is such that the locking element 4 is securely held in the locked position, thereby more reliably locking the movement of the operating handle 2 and preventing it from moving toward the disengaged position.

[0052] It should be understood that the above description is intended to be illustrative and not limiting. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. Furthermore, many modifications can be made to adapt a particular situation or material to the teachings of this disclosure without departing from the scope of this disclosure. The functions or performance of the various elements or modules described herein are for illustrative purposes only and are by no means limiting, but merely exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art after reading the above description. Therefore, the scope of this disclosure should be determined by reference to the appended claims and the full scope of their equivalents.

[0053] In the appended claims, the terms “comprising” and “wherein” are used as simple English equivalents to the corresponding terms “including” and “in which”. Furthermore, in the following claims, the terms “first,” “second,” and “third,” etc., are used merely as notations and are not intended to impose numerical requirements on their objects.

Claims

1. An operating mechanism, comprising case, An operating handle, pivotally mounted to the housing to move between an open and closed position, includes operating teeth and a locking portion. The drive assembly includes a toothed drive section configured to engage with the operating teeth such that when the operating handle is moved to the disengaged position, the operating handle drives the drive assembly to the disengaged state, and when the operating handle is moved to the closed position, the operating handle drives the drive assembly to the closed state. The drive assembly also includes a positioning lever. A locking element, mounted to the housing, is movable between a locked position and an unlocked position. In the locked position, the locking element locks the locking portion to prevent the operating handle from moving from a closed position to a open position. In the unlocked position, the locking element disengages from the locking portion to allow the operating handle to move. in, The locking element and the positioning rod cooperate to position the locking element in the locking position when the driving component is in the closed state, and to position the locking element in the unlocked position when the driving component is in the open state.

2. The operating mechanism according to claim 1, wherein, When the drive assembly is capable of switching between the open and closed states, the operation handle requires a tripping force to move from the closed position to the open position. When the drive assembly is held in the closed state due to welding, the locking element is able to resist at least three times the opening operation force to prevent the operating handle from moving from the closed position to the open position.

3. The operating mechanism according to claim 2, wherein, The locking element is pivotally mounted to the housing and is provided with a biasing element to bias the locking element in the unlocked position.

4. The operating mechanism according to claim 3, wherein, The locking component includes a first arm and a second arm. The first arm can be rotated by the positioning rod so that the locking protrusion on the second arm extends into the movement path of the locking part, thereby preventing the operating handle from moving from the closed position to the open position.

5. The operating mechanism according to claim 4, wherein, The included angle between the first arm and the second arm is configured such that, during the movement of the operating handle from the open position to the closed position, after the locking part passes the locking protrusion, the locking protrusion extends into the movement path of the locking part.

6. A switching device, comprising: The operating mechanism according to any one of claims 1-5, The main switch assembly can switch between closed and open states. A pre-charging circuit, connected in parallel with the main switch group, includes a pre-charging switch group and a pre-charging resistor connected in series. in, The precharge switch group is operated by the operating mechanism such that when the drive component is in the closed state, the precharge switch group is closed, and when the drive component is in the open state, the precharge switch group is open.

7. The switching device according to claim 6, wherein, The main switch assembly can be operated by the operating handle to switch between closed and open states. The operating handle can indicate the state of the switching device. When both the main switch group and the precharge switch group are open, the operating handle is in the open position; when at least one of the main switch group and the precharge switch group is closed, the operating handle is in the closed position.

8. The switching device according to claim 6, wherein, When the precharge switch assembly is welded, the drive component remains in the closed state, and the locking element prevents the operating handle from moving from the closed position to the open position.

9. The switching device according to claim 6, wherein, The pre-charge moving contact of the pre-charge switch assembly is fixed on the positioning rod.

10. The switching device according to any one of claims 6-9, wherein, The switching device is a fusion circuit breaker.

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