Operating mechanism and switching device

Abstract

The utility model provides an operating mechanism which is characterized by comprising a shell. The operating handle can be pivotally mounted to the shell so as to move between an open position and a closed position, and the operating handle comprises operating teeth and a shifting part; the driving assembly comprises a driving toothed part, and the driving toothed part is configured to be meshed with the operating teeth, so that the driving assembly is driven to be in an open state when the operating handle is located at the open position, and the driving assembly is driven to be in a closed state when the operating handle is located at the closed position; the blocking piece can be pivotally mounted to the shell so as to move between a blocking position and an avoiding position, the blocking piece is provided with a biasing piece to bias the blocking piece at the blocking position so as to block the movement of the shifting part, and the blocking piece is arranged in a manner that when the operating handle moves from the closing position to the opening position, the blocking piece is blocked by the biasing piece; and under the condition that the shifting part applies force larger than or equal to the first force to the blocking piece, the blocking piece moves to the avoiding position so as to allow the operation handle to move from the closing position to the opening position.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of electrical engineering, in particular to an operating mechanism and a switching device comprising the same. BACKGROUND

[0002] A pre-charge switch controls the on-off of a pre-charge resistor, so that when the high voltage is powered on, the current rises slowly through the pre-charge resistor, avoiding the instantaneous large current generated when the switch is directly closed, which can cause damage to the system. The use of pre-charge switch can effectively prolong the service life of, for example, motor controllers and battery systems. By limiting the pre-charge resistor, the risk of damage to the capacitor and the relay is reduced, thereby improving the stability and safety of the entire system.

[0003] In order to save costs and provide more comprehensive protection functions, the applicant proposes to integrate the functions of the pre-charge switch group and the main switch group into the same product, such as a fusion switch. In order 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, in the design of the fusion switch, in addition to the secto design of the main switch group, the secto design of the pre-charge switch group must also be considered, that is, when the pre-charge switch group is welded, it must be able to withstand 3 times or more breaking operation force, while ensuring the correctness of the indication to prevent false indications from causing safety accidents.

[0004] Therefore, there is a need for an operating mechanism that can solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present disclosure is to at least solve the shortcomings in the prior art. The present disclosure provides an operating mechanism, characterized in that it comprises a housing; an operating handle pivotally mounted to the housing to move between an open position and a closed position, the operating handle comprising an operating tooth and a pushing portion; a drive assembly comprising a drive belt tooth portion configured to engage with the operating tooth such that the drive assembly is driven to an open state when the operating handle is in the open position and the drive assembly is driven to a closed state when the operating handle is in the closed position; a blocking piece pivotally mounted to the housing to move between a blocking position and a avoiding position, the blocking piece being biased to the blocking position by a biasing member to hinder the movement of the pushing portion, the blocking piece being configured such that, when the operating handle moves from the closed position to the open position, the blocking piece moves to the avoiding position to allow the operating handle to move from the closed position to the open position under the condition that the pushing portion applies a force greater than or equal to a first force to the blocking piece.

[0006] For example, according to some embodiments of the present disclosure, the drive assembly is configured such that, when the drive assembly is held in the closed state due to the fusion welding, the operating teeth are disengaged from the drive belt teeth under the condition that the operating teeth apply a force to the drive belt teeth that is greater than or equal to a second force, the torque generated on the operating handle by the second force being at least twice the torque generated on the operating handle by the first force.

[0007] For example, according to some embodiments of the present disclosure, the operating handle requires an opening operation force to move from the closed position to the open position when the drive assembly is capable of switching between the open state and the closed state. When the drive assembly is held in the closed state due to the fusion welding, the blocking member and the drive belt teeth are capable of resisting at least three times the opening operation force applied to the operating handle to hinder the movement of the operating handle from the closed position to the open position.

[0008] For example, according to some embodiments of the present disclosure, the blocking member and the poking portion of the operating handle are configured such that the torque applied by the poking portion to the blocking member is opposite to the torque applied by the biasing member.

[0009] For example, according to some embodiments of the present disclosure, the resistance of the blocking member to the movement of the operating handle from the closed position to the open position is greater than the resistance of the blocking member to the movement of the operating handle from the open position to the closed position.

[0010] For example, according to some embodiments of the present disclosure, the blocking member comprises a first surface and a second surface, the poking portion abutting against the second surface to move the blocking member to the avoiding position when the operating handle moves from the closed position to the open position, and the poking portion abutting against the first surface to move the blocking member to the avoiding position when the operating handle moves from the open position to the closed position.

[0011] The shapes of the first surface and the second surface and the distances from the pivoting point of the blocking member are configured such that the force arm of the force applied by the poking portion to the first surface is greater than the force arm of the force applied by the poking portion to the second surface.

[0012] The present disclosure also proposes a switching device comprising the operating mechanism of any of the embodiments of the present disclosure; a main switch group capable of switching between closed and open; a pre-charge circuit connected in parallel to the main switch group, the pre-charge circuit comprising a pre-charge switch group and a pre-charge resistor connected in series. When the drive assembly is in the closed state, the pre-charge switch group is closed, and when the drive assembly is in the open state, the pre-charge switch group is open.

[0013] For example, according to some embodiments of the present disclosure, the main switch group is operable by the operating handle to switch between closed and open, the operating handle is capable of indicating the state of the switch assembly, when both the main switch group and the pre-charging switch group are open, the operating handle is in the open position; when at least one of the main switch group and the pre-charging switch group is closed, the operating handle is in the closed position.

[0014] For example, according to some embodiments of the present disclosure, when the pre-charging switch group is welded, the drive assembly remains in the closed state, the blocking piece and the drive belt tooth portion hinder the movement of the operating handle from the closed position to the open position.

[0015] For example, according to some embodiments of the present disclosure, the switch device is a fused circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic circuit diagram showing the connection relationship of the main switch group and the pre-charging circuit of the switch device according to an embodiment of the present disclosure;

[0017] Figure 2 A perspective schematic diagram of the operating mechanism according to an embodiment of the present disclosure;

[0018] Figures 3a-3c A plan view showing the movement process of the operating handle of the operating mechanism according to the present disclosure from the open position to the closed position, wherein, Figure 3a The toggle portion has not yet caused the blocking piece to deflect and avoid, the drive assembly is in the open state, Figure 3b The toggle portion has caused the blocking piece to deflect and avoid, the drive assembly is in a state between the open state and the closed state, Figure 3c The operating tooth and the drive belt tooth portion have been separated, and the drive assembly is in the closed state;

[0019] Figure 4a A plan view showing the interaction between the toggle portion and the blocking piece during the movement process of the operating handle of the operating mechanism according to the present disclosure from the closed position to the open position, Figure 4b is Figure 4a a partial enlarged view.

[0020] REFERENCE NUMERALS

[0021] 1 housing,

[0022] 2 operating handle, 21 operating tooth, 22 toggle portion,

[0023] 31 first rod, 32 second rod, 33 third rod, 34 drive belt tooth portion,

[0024] 4 blocking piece, 41 first surface, 42 second surface, 43 biasing member,

[0025] 51 main switch group, 52 pre-charge resistor, 53 pre-charge switch group, 531 pre-charge movable contact, 532 pre-charge fixed contact DETAILED DESCRIPTION

[0026] In order to make the purpose, scheme and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified and limited, the terms used herein have the meanings commonly used in the art. The same reference signs in the drawings represent the same components.

[0027] In the description of the present disclosure, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “linking” should be understood broadly, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, can be electrical connection; can be directly connected, can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0028] The present disclosure proposes an operating mechanism and a switch device comprising the operating mechanism, which can comprise a main switch group 51 and a pre-charge switch group 53, in particular as shown in Figure 1 The main switch group 51 and the pre-charge switch group 53 are connected in parallel. The operating mechanism can be used to operate both the main switch group 51 and the pre-charge switch group 53. In particular, the operating mechanism comprises an operating handle 2, as shown in Figure 2 The operating handle 2 is pivotally mounted to the housing 1, and by making the pivoting movement of the operating handle 2, the closing and opening of the main switch group and the pre-charge switch group can be caused. In particular, the operating handle 2 can not only be operated manually (pivoting movement), but also be automatically operated by an electric device (not shown).

[0029] 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 switch device is open, i.e. both the main switch group 51 and the pre-charge switch group 53 are open; when the operating handle 2 is in the closed position, the entire switch device is on, i.e. at least one of the main switch group 51 and the pre-charge switch group 53 is closed. Thus, the on-off state of the switch device comprising the operating handle 2 can be indicated by the position of the operating handle 2.

[0030] However, in some special cases, the indication of the operation handle 2 can be inaccurate, for example, the operation handle 2 is in the open position, while the switch device is actually in the on state, which can cause a safety accident. The dynamic contact and the static contact are fused together, which belongs to the above-mentioned special case, in this case, the dynamic contact and the static contact are fixed due to fusion, at this time, if the operation handle 2 is forced to move from the closed position to the open position, although the dynamic contact cannot move, the intermediate transmission mechanism connecting the operation handle and the dynamic contact can allow the operation handle to move to the open position due to deformation and other reasons, which can cause a safety accident.

[0031] Therefore, secto design is required, that is, when the switch group of the switch device is fused, it must be able to withstand 3 times or more of the normal breaking operation force required, that is, when the operation handle is applied with less than 3 times of the breaking operation force, the operation handle cannot move to the open position. The switch device according to the present disclosure includes a main switch group and a pre-charging switch group, which not only requires secto design for the main switch group, but also requires secto design for the pre-charging switch group, which is realized by the operating mechanism according to the present disclosure.

[0032] Specifically, the operation handle 2 of the operating mechanism according to the present disclosure can drive the driving assembly of the operating mechanism, and the driving assembly can be connected with the pre-charging dynamic contact 531, for example, the pre-charging dynamic contact 531 can be driven by the third rod 33 of the driving assembly, as shown in Figure 2 By driving the driving assembly, the pre-charging dynamic contact 531 and the pre-charging static contact 532 can be contacted or separated. In particular, the driving assembly can be switched between the open state and the closed state, in the open state, the driving assembly causes the pre-charging dynamic contact 531 and the pre-charging static contact 532 to separate, and in the closed state, the driving assembly causes the pre-charging dynamic contact 531 and the pre-charging static contact 532 to contact.

[0033] The operation handle 2 can drive the driving assembly through the operation teeth 21 provided on the operation handle 2 and the driving belt teeth 34 provided on the driving assembly. Specifically, as shown in Figure 2 and Figure 3c The operation teeth 21 and the driving belt teeth 34 can be engaged and separated, when the operation teeth 21 and the driving belt teeth 34 are separated, the movement of the operation handle 2 is independent of the movement of the driving assembly, and when the operation teeth 21 and the driving belt teeth 34 are engaged, the movement of the operation handle 2 and the movement of the driving assembly can be conducted and converted.

[0034] Therefore, the operation teeth 21 and the driving belt teeth 34 can each include one or more teeth, for example, as shown in Figure 3c The operation teeth 21 can be a single tooth, and the driving belt teeth 34 can include two teeth to conduct movement in two opposite directions, for example, Figures 3a to 3c the transmission of the movement process and vice versaFigures 3c to 3a conduction of the movement of the operating handle.

[0035] In particular, the drive gear 34 is configured to engage with the operating tooth 21 such that when the operating handle 2 is moved to the open position (not shown in the figures, an upstream position in the counterclockwise direction of the positions of the operating handle 2 shown in the figures), the operating handle 2 drives the drive assembly to the open state (as shown in the figures), and when the operating handle is moved to the closed position (as shown in the figures), the operating handle 2 drives the drive assembly to the closed state (as shown in the figures). Figure 3a Figure 3a Figure 3c Figure 3c

[0036] The drive assembly may, for example, be a four-bar linkage structure, as shown by the dashed lines in the figures. The drive assembly may, for example, include a first rod 31, a second rod 32, and a third rod 33, the first rod 31 and the third rod 33 being non-adjacent. The drive gear 34 may be fixed to the first rod 31 to rotate synchronously with the first rod 31. Figure 3a

[0037] Figures 3a to 3c A plan view showing the movement of the operating handle of the operating mechanism according to the present disclosure from the open position to the closed position is shown in the figures, wherein, Figure 3a An intermediate position in the movement of the operating handle from the open position to the closed position is shown, in which position the operating tooth 21 may, for example, just come into contact with the drive gear 34 or not yet be in contact (obstructed), and the drive assembly is still in the open state; Figure 3b Another intermediate position in the movement of the operating handle from the open position to the closed position is shown, which position is closer to the closed position, in which position the operating tooth 21 and the drive gear 34 are in engagement and drive the drive gear 34 to rotate by a certain angle, causing the drive assembly to be in a state between the open state and the closed state; Figure 3c The operating handle 2 is shown moved to the closed position, the operating tooth 21 and the drive gear 34 are separated, the drive assembly is in the closed state, and the pre-charge movable contact 531 and the pre-charge stationary contact 532 are in contact.

[0038] When the pre-charge movable contact 531 and the pre-charge stationary contact 532 are welded, although the drive assembly is locked due to the four-bar linkage structure, the tooth engagement of the operating tooth 21 and the drive gear 34 may not be able to withstand a large external force and may be disengaged, and the four-bar linkage structure may also be elastically deformed, and a large force (for example, 2.5 times the opening operation force) is applied to the operating handle 2 to forcibly operate the operating handle 2, which may cause the operating handle 2 to be moved to the open position. The opening operation 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 be switched between the open state and the closed state (i.e., the pre-charge movable contact 531 and the pre-charge stationary contact 532 can normally be in contact and separated). ​​​​​

[0039] Therefore, the operating handle 2 may also be provided with a toggle part 22, which may be, for example, a part of the operating handle 2 that protrudes radially outward relative to the pivot axis, so as to move together with the operating handle 2.

[0040] Correspondingly, the operating mechanism also includes a blocking member 4, which is mounted to the housing 1, for example, pivotally mounted to the housing 1, so as to be in the blocking position ( Figure 3a and 3c (as shown) and avoidance position ( Figure 3b The movement between (as shown). Specifically, as... Figure 3b As shown, in the blocking position, at least a portion of the blocking member 4 is located in the movement path of the actuating part 22. Therefore, regardless of whether the operating handle 2 moves from the open position to the closed position (i.e., from...), Figure 3a Position moved to Figure 3c The position), or when the operating handle 2 moves from the closed position to the open position (i.e., from the position of the closed position to the open position). Figure 3c Position moved to Figure 4a The position is then moved to Figure 3a In the closed position, the blocking member 4 obstructs the movement of the operating handle 2. In the open position, the blocking member 4 is completely removed from the movement path of the toggle part 22, allowing the operating handle to move between the closed and open positions.

[0041] This disclosure utilizes the obstruction of the blocking member 4 in the blocking position to achieve the seto design. The shape of the blocking member 4 and its position relative to the toggle part 22 can be set so that the blocking member 4 can be pivoted by the toggle part 22, switching between the blocking position and the avoidance position, as shown below. Figures 3a-3c As shown. The blocking member 4 may be provided with a biasing member 43 to bias the blocking member 4 into a blocking position, such as... Figure 3c As shown, the blocking member 4 automatically returns to the blocking position without being subjected to the force of the actuating part. Therefore, switching the blocking member 4 from the blocking position to the yielding position requires overcoming the biasing force of the biasing member 4. In particular, when the operating handle 2 moves from the closed position to the open position, the blocking member 4 obstructs the movement of the actuating part 22. If the actuating part 22 is to continue moving, this biasing force must be overcome to pivot the blocking member 4 from the blocking position to the yielding position. Figure 4a The state shown becomes Figure 3a The state shown.

[0042] The shape of the blocking member 4 and its position relative to the actuating part 22 can be further configured so that when the operating handle 2 moves from the closed position to the open position, if the actuating part 22 applies a force greater than or equal to the first force to the blocking member 4, the blocking member 4 can move to an avoidance position. For example, Figure 4bAs shown, the blocking member 4 comprises a first surface 41 and a second surface 42. When the operating handle 2 moves from the closed position to the open position, the knob 22 abuts against the second surface 42, and the state when the knob 22 just contacts the second surface 42 is as shown in Figure 4b As shown. Figure 4b The dashed line in the figure represents the line connecting the pivot center of the blocking member 4 and the contact point of the two, and the black arrow represents the first force, so it can be seen that the second surface 42 is arranged so that the torque direction of the first force on the blocking member 4 is such that the blocking member 4 moves towards the avoidance position, in particular, opposite to the torque direction exerted by the biasing member 43.

[0043] The second surface 42 can also be further arranged to set the size of the first force, since the biasing torque of the biasing member 43 is constant, the size of the force arm of the first force can be adjusted by the shape of the second surface and the distance from the pivot point of the blocking member, thereby setting the size of the first force. The first force will generate a resistance torque on the operating handle 2, thereby the first force is actually set by setting the resistance torque of the first force on the operating handle 2.

[0044] In order to meet the resistance to three times the opening operation force, the operating tooth 21 and the driving belt tooth portion 34 can also be forcibly disengaged to receive the elastic resistance. Specifically, the pre-charging male contact 531 and the pre-charging female contact 532 are fixed together due to fusion welding, and the driving assembly is locked due to the four-bar linkage structure, Figure 4a The operating tooth and the driving belt tooth portion are shown in engagement, and in order to further move the operating handle 2 towards the open position, it is necessary to forcibly apply force to the operating handle so that the operating tooth 21 and the driving belt tooth portion 34 are at least partially disengaged due to the elastic deformation of the operating mechanism. According to the operating mechanism of the present disclosure, when the operating handle moves from the closed position to the open position, the operating tooth 21 is disengaged from the driving belt tooth portion 34 in the case where the operating tooth 21 exerts a force greater than or equal to the second force on the driving belt tooth portion 34.

[0045] Therefore, in the fusion welded state, if it is desired to forcibly apply force to the operating handle 2 to move it from the closed position to the open position, it is necessary to overcome the resistance of both the blocking member 4 and the driving belt tooth portion 34. Further, the torque generated by the second force on the operating handle 2 can be at least twice the torque generated by the first force on the operating handle 2. The torque generated by the first force on the operating handle 2 plus the torque generated by the second force on the operating handle 2 is at least three times the opening operation force to resist the movement of the operating handle from the closed position to the open position, to meet the design requirements of secto.

[0046] Further, since the blocking member 4 is biased in the blocking position, when the operating handle 2 moves from the open position to the closed position, as shown in Figure 3a to the position shown in Figure 3cThe position of the blocking member 4 is also subject to the resistance of the toggle 22, and therefore the resistance of the toggle 22 during the process should be set as small as possible. Specifically, the blocking member 4 can further comprise a first surface 41, which the toggle 22 abuts against when the operating handle 2 moves from the open position to the closed position, to toggle the blocking member 4 to the avoiding position.

[0047] Specifically, the torque of the toggle 22 of the operating handle 2 on the blocking member 4 when the operating handle 2 moves from the open position to the closed position is also opposite to the torque of the biasing member, otherwise the same, the deformation of the biasing member during the process will be larger, and the resistance torque during the process will be larger.

[0048] Further, the resistance of the operating handle 2 to the blocking member 4 when the operating handle 2 moves from the open position to the closed position can be set by setting the shape of the first surface 41 and the position relative to the toggle 22, so that the resistance of the operating handle 2 to the blocking member 4 during the process is smaller than the resistance (reaction force of the first force) when moving from the closed position to the open position. Specifically, the biasing torque of the biasing member 43 is constant, and the resistance can be reduced by increasing the force arm, and in particular, the force arm of the force of the toggle 22 acting on the first surface 41 is greater than the force arm of the force of the toggle 22 acting on the second surface 42.

[0049] In addition, the disclosure also proposes a switch device, which can be a fuse breaker, comprising an operating mechanism according to the disclosure, capable of switching the main switch group 51 between closed and open, and a pre-charge circuit. The pre-charge circuit is connected in parallel with the main switch group 51, and the pre-charge circuit comprises a pre-charge switch group 53 and a pre-charge resistor 52 connected in series, as shown in Figure 1 Thus, the manual isolation switch can be omitted, and the pre-charge switch group and the main switch group are in parallel relationship, so that the pre-charge switch group and the main switch group jointly undertake the function of loop isolation, and the pre-charge circuit protection function is fully utilized.

[0050] Specifically, the pre-charge switch group 53 is operated by the operating mechanism, for example as described above, the pre-charge movable contact 531 of the pre-charge switch group 53 can be driven by the third rod 33 of the drive assembly, so that when the drive assembly is in the closed state, the pre-charge switch group is closed, and when the drive assembly is in the open state, the pre-charge switch group is open. Further, the main switch group 51 can also be operated by the operating handle 2 to switch between closed and open, which can be realized by another existing transmission mechanism, which is not described in detail here.

[0051] Further, the switch device according to the present disclosure can operate the pre-charge switch group 53 and the main switch group 51 according to a specific sequence due to the pre-charge circuit. When the operating handle 2 is moved from the open position to the closed position, the pre-charge switch group 53 is closed first, the pre-charge circuit is turned on, and the pre-charge resistor 52 is used for load current limiting closing, and then the main switch group 51 is closed and the pre-charge circuit is short-circuited, and then the pre-charge switch group 53 is opened, and the pre-charge circuit is opened without load. If the pre-charge switch group 53 fails to pre-charge through the pre-charge circuit after being closed, the operating handle 2 can be used for opening operation, i.e., the operating handle 2 is moved from the closed position to the open position, so that the pre-charge switch group 53 is opened and load opening is performed.

[0052] Due to the operating mechanism according to the present disclosure, the operating handle 2 can indicate the state of the switch device, and when the main switch group 51 and the pre-charge switch group 53 are both opened, the operating handle 2 is in the open position; when at least one of the main switch group 51 and the pre-charge switch group 53 is closed, the operating handle 2 is in the closed position.

[0053] Specifically, as described above, when the pre-charge switch group 53 is welded, if a force is forcibly applied to the operating handle 2 to move it from the closed position to the open position, both the blocking piece 4 and the driving toothed portion 34 need to be overcome, and the blocking piece and the driving toothed portion can at least resist three times the opening operation force applied to the operating handle to resist the movement of the operating handle from the closed position to the open position.

[0054] It should be understood that the above description is intended to explain and not limit the application. For example, the above-described embodiments (and / or aspects thereof) can be used in combination with each other. In addition, many modifications can be made to adapt a particular situation or material to the teachings of the application without departing from its scope. The functions or the performances of various elements or modules described herein are for illustration only and are by no means limiting, and are merely exemplary embodiments. After reading the above description, many other embodiments and modifications will be apparent to those skilled in the art within the spirit and scope of the claims. Therefore, the scope of the present disclosure should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled.

[0055] In the appended claims, the terms "comprise" and "wherein" are used as simple English equivalents of the respective terms "include" and "comprising." Furthermore, in the following claims, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Claims

1. An operating mechanism, characterized in that, include case, An operating handle, pivotally mounted to the housing for movement between an open and closed position, includes operating teeth and a toggle mechanism. A drive assembly includes a drive toothed portion configured to engage with the operating teeth such that, when the operating handle is in the disengaged position, the drive assembly is driven to the disengaged state, and when the operating handle is in the closed position, the drive assembly is driven to the closed state. A blocking member, pivotally mounted to the housing to move between a blocking position and a yielding position, is provided with a biasing member to bias the blocking member in the blocking position to impede the movement of the actuating part. The blocking member is configured such that when the operating handle moves from the closed position to the open position, if the actuating part applies a force greater than or equal to a first force to the blocking member, the blocking member moves to the yielding position to allow the operating handle to move from the closed position to the open position.

2. The operating mechanism according to claim 1, characterized in that, The drive assembly is configured such that, when the drive assembly is held in the closed state due to welding, and the operating handle moves from the closed position to the open position, if the operating teeth apply a force greater than or equal to the second force to the drive belt teeth, the operating teeth disengage from the drive belt teeth, and the torque generated by the second force on the operating handle is at least twice the torque generated by the first force on the operating handle.

3. The operating mechanism according to claim 2, characterized in that, 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 remains in the closed state due to welding, the blocking member and the drive toothed portion are able to resist at least three times the opening operation force applied to the operating handle to prevent the operating handle from moving from the closed position to the open position.

4. The operating mechanism according to claim 1, characterized in that, The blocking member and the actuating part of the operating handle are configured such that the torque applied by the actuating part to the blocking member is opposite to the torque applied by the biasing member.

5. The operating mechanism according to claim 4, characterized in that, The resistance encountered by the blocking member when the operating handle moves from the closed position to the open position is greater than the resistance encountered when it moves from the open position to the closed position.

6. The operating mechanism according to claim 5, characterized in that, The blocking member includes a first surface and a second surface. When the operating handle moves from the closed position to the open position, the actuating part abuts against the second surface to move the blocking member to the avoidance position. When the handle moves from the open position to the closed position, the actuating part abuts against the first surface to move the blocking member to the avoidance position. The shapes of the first and second surfaces and the distance from the pivot point of the blocking member are set such that the lever arm of the force exerted by the actuating part on the first surface is greater than the lever arm of the force exerted by the actuating part on the second surface.

7. A switching device, characterized in that, include The operating mechanism according to any one of claims 1-6, 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. When the drive component is in the closed state, the precharge switch group is closed; when the drive component is in the open state, the precharge switch group is open.

8. The switching device according to claim 7, characterized in that, The main switch assembly, operable by the operating handle, can be switched between closed and open. The operating handle can indicate the state of the switching components. 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 open, the operating handle is in the closed position.

9. The switching device according to claim 8, characterized in that, During the welding of the precharge switch assembly, the drive assembly remains in the closed state, and the blocking member and the drive toothed part prevent the operating handle from moving from the closed position to the open position.

10. The switching device according to any one of claims 1-9, characterized in that, The switching device is a fusion circuit breaker.

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