Holding device for reducing closing impact and dual-power change-over switch

Abstract

The embodiment of the utility model provides a holding device for reducing closing impact and a dual-power change-over switch. The holding device comprises at least one driving piece which is suitable for being driven by an action mechanism to rotate between a closing position and an opening position, and the driving piece comprises a body which comprises a rotating part and is rotatably coupled to a support of the dual-power change-over switch through the rotating part; the hasp bulges protrude out of the body along different radial directions of the rotating part respectively; the tripping rods are arranged on one side of the driving part in the radial direction side by side and are suitable for rotating between a blocking position and an avoiding position; and the push rod is coupled to the pair of tripping rods and is suitable for driving the pair of tripping rods to rotate. Therefore, the swinging distance of the driving piece to the switching-on position can be shortened, and the impact force between the moving contact and the static contact during the switching-on period of the dual-power change-over switch is reduced.

Description

Technical Field

[0001] The exemplary embodiments disclosed herein generally relate to the field of electrical equipment, and particularly to holding devices and dual power transfer switches for reducing closing shocks. Background Technology

[0002] A dual power transfer switch is an electrical device used for automatic or manual switching between different power sources. It is mainly used in applications where high power supply reliability is required. When one power source fails or experiences a power outage, it can quickly switch the load to another normal power source, ensuring continuous power supply to the load and effectively preventing equipment downtime and production interruptions caused by power outages. Utility Model Content

[0003] In a first aspect of this disclosure, a holding device for reducing closing impact is provided. The holding device includes: at least one drive member disposed between the actuating mechanism and the moving contact assembly of a dual-power transfer switch, and adapted to be driven by the actuating mechanism to rotate between a closed position and an open position to actuate the moving contact assembly; the drive member includes: a body including a rotating portion, and the body being rotatably coupled to a bracket of the dual-power transfer switch via the rotating portion; and a pair of latching protrusions protruding from the body in different radial directions along the rotating portion; a pair of trip levers disposed side-by-side on one radial side of the drive member, each trip lever coupled to the bracket and adapted to rotate between a blocking position and a yielding position; in the blocking position, the trip levers prevent the drive member from swinging between the closed and open positions, and the trip levers include yielding portions arranged to yield to the pair of latching protrusions while the trip levers are in the yielding position; and a push rod coupled to the pair of trip levers and adapted to drive the pair of trip levers to rotate.

[0004] In some embodiments, the trip lever further includes: a rotating shaft rotatably coupled to the bracket and adapted to rotate between a blocking position and a clearance position, and the clearance portion includes at least one half-shaft groove formed on the circumferential surface of the rotating shaft and aligned in the radial direction with at least one drive member.

[0005] In some embodiments, the trip lever further includes: a drive protrusion disposed on the circumferential surface of the rotating shaft and protruding radially from the rotating shaft, wherein the push rod is coupled to an electromagnet of a dual power transfer switch and is adapted to push the drive protrusion under the drive of the electromagnet to rotate the rotating shaft about its own axis.

[0006] In some embodiments, the retaining device further includes: a reset assembly disposed at one end of the trip lever in an axial direction, and including: a reset lever coupled to the trip lever and adapted to extend in a radial direction along the trip lever; and a reset spring disposed between the bracket and the reset lever.

[0007] In some embodiments, the retaining device further includes a transmission member disposed between the drive member and the moving contact assembly, and includes: a connecting shaft passing through the rotating portion and extending toward the moving contact assembly, the connecting shaft and the rotating portion being aligned axially; a crank arm surrounding the outside of the connecting shaft and extending radially along the connecting shaft, the crank arm being coupled to the moving contact assembly to drive the moving contact assembly to rotate about the axis of the connecting shaft; and a drive shaft disposed between the drive member and the crank arm and spaced a predetermined distance from the connecting shaft to drive the crank arm to rotate about the connecting shaft during rotation of the drive member between the closed position and the open position.

[0008] In some embodiments, the drive member further includes a coupling portion formed on the body and arranged near the first of a pair of latching protrusions, the coupling portion being coupled to the drive shaft.

[0009] In some embodiments, the drive further includes a pair of drive portions, respectively arranged on opposite sides of the body and adapted to couple with an actuation mechanism.

[0010] In some embodiments, the first of a pair of latch protrusions contacts at least partially the half-shaft groove of the first trip lever of a pair of trip levers during the open position of the drive member, thereby limiting the rotation of the first trip lever toward the blocking position.

[0011] In some embodiments, the second of a pair of latching protrusions contacts the first trip lever during the period when the drive member is in a standby energy storage position between the open and closed positions, and is restricted by the first trip lever to rotate toward the closed position.

[0012] In some embodiments, the first of a pair of latching protrusions contacts the second trip lever of a pair of trip levers during the period when the drive is in the open position and the closed position, in the standby open energy storage position, and is restricted by the second trip lever to rotate toward the open position.

[0013] According to the holding device provided in the embodiments of this disclosure, during the swing of the drive member from the open position to the closed position, the first latch protrusion of a pair of latch protrusions can pass through the first trip rod via the avoidance portion of the first trip rod of a pair of trip rods, and the second latch protrusion can make holding contact with the first trip rod. Thus, the drive member can be limited to a standby closing energy storage position between the closed and open positions, and upon tripping, the trip rod releases the limitation on the drive member, allowing the drive member to quickly rotate to the closed position. In this way, the swing distance of the drive member to the closed position can be shortened, thereby reducing the energy released by the main spring inside the actuating mechanism, and consequently reducing the kinetic energy obtained by the drive member and the moving contact. This helps to reduce the impact force between the moving contact and the stationary contact during the closing of the dual power supply transfer switch, protecting the moving and stationary contacts and extending the service life of the dual power supply transfer switch.

[0014] In a second aspect of this disclosure, a dual-power transfer switch is provided. The dual-power transfer switch includes: a bracket; at least one actuating mechanism; at least one electromagnet adapted to operate based on a closing signal or a opening signal; a moving contact assembly; and at least one holding device according to a first aspect of this disclosure, disposed between the at least one actuating mechanism and the moving contact assembly.

[0015] It should be understood that the content described in this content section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0017] Figure 1 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown;

[0018] Figure 2 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown from another perspective.

[0019] Figure 3 and Figure 4 Schematic diagrams of the holding device according to some embodiments of the present disclosure with the drive member in the open position are shown from different perspectives.

[0020] Figure 5 A schematic diagram of the overall structure of the trip lever according to some embodiments of the present disclosure is shown;

[0021] Figure 6 and Figure 7 Schematic diagrams of the holding device according to some embodiments of the present disclosure with the drive member in the standby closing energy storage position are shown from different perspectives.

[0022] Figure 8 and Figure 9 Schematic diagrams of the holding device according to some embodiments of the present disclosure with the drive member in the closed position are shown from different perspectives; and

[0023] Figure 10 and Figure 11 Schematic diagrams of the holding device according to some embodiments of the present disclosure with the drive member in the standby opening and energy storage position are shown from different perspectives. Detailed Implementation

[0024] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0025] It should be noted that the headings of any section / subsection provided herein are not limiting. Various embodiments are described throughout this document, and embodiments of any type may be included under any section / subsection. Furthermore, embodiments described in any section / subsection may be combined in any way with any other embodiments described in the same section / subsection and / or different sections / subsections.

[0026] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The term "some embodiments" should be understood as "at least some embodiments". Other explicit and implicit definitions may also be included below. The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0027] As briefly mentioned earlier, to enable the dual-power transfer switch to quickly switch between power sources, the switch mechanism stores energy beforehand, allowing the internal spring to rotate past its dead point (i.e., the critical point where the spring pushes the mechanism to rotate in opposite closing and opening directions). Thus, the spring stores elastic potential energy to propel the mechanism to the opposite operating state. When a switch is needed, the mechanism is released and can move quickly under the elastic force of the spring. For example, when a switch is required, the spring can drive the mechanism to move quickly from the closed state to the open state.

[0028] However, the rapid movement of the mechanism can generate significant impact forces between the contacts, potentially damaging them or affecting their lifespan. To reduce these impact forces, a buffer device is typically incorporated into the dual-power transfer switch. Traditional buffer devices are complex in structure and have limited buffering effectiveness.

[0029] The buffer device and dual-power transfer switch for dual-power transfer switches provided in this disclosure solve, or at least partially solve, the aforementioned problems and other potential problems existing in conventional solutions. The holding device and dual-power transfer switch for reducing closing impact provided in the embodiments of this disclosure allow the drive member to swing between the open and closed positions through the interaction of a pair of latching protrusions protruding from the drive member body and a pair of tripping levers.

[0030] During the swing of the drive member from the open position to the closed position, the first latch protrusion of a pair of latch protrusions can pass through the first trip lever via the avoidance portion of the first trip lever of a pair of trip levers, and the second latch protrusion can maintain contact with the first trip lever. This limits the drive member to a standby closing energy storage position between the closed and open positions, and upon tripping, the trip lever releases the limitation on the drive member, allowing it to quickly rotate to the closed position. This shortens the swing distance of the drive member to the closed position, thereby reducing the energy released by the main spring inside the actuating mechanism. Consequently, the kinetic energy gained by the drive member and the moving contact is also reduced. This helps to reduce the impact force between the moving and stationary contacts during the closing of the dual-power transfer switch, protecting both the moving and stationary contacts and extending the service life of the dual-power transfer switch.

[0031] Figure 1 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown. Figure 2 A schematic diagram of the internal structure of a dual-power transfer switch according to some embodiments of the present disclosure is shown from another viewpoint. For example... Figure 1 As shown, the dual power transfer switch generally includes a bracket, a stationary contact 7 fixedly coupled to the bracket, a moving contact assembly 6 movably coupled to the bracket, an actuating mechanism 8 rotatably coupled to the bracket, and a retaining device arranged between the actuating mechanism 8 and the moving contact assembly 6. The retaining device can drive the moving contact assembly 6 to rotate under the drive of the actuating mechanism 8, so that the moving contact assembly 6 can contact or separate from the stationary contact 7. Thus, the dual power transfer switch can perform opening and closing operations on the coupled lines. The dual power transfer switch also includes an electromagnet 31. The electromagnet 31 is coupled to the retaining device, and the electromagnet 31 can actuate upon receiving a trip signal, causing the retaining device to actuate rapidly under the drive of the actuating mechanism 8.

[0032] Figure 3 A schematic diagram of a holding device according to some embodiments of the present disclosure is shown. Figure 4 A schematic diagram of a holding device according to some embodiments of the present disclosure is shown from another viewpoint. For example... Figure 3 and Figure 4As shown, the retaining device generally includes at least one drive member 1, a pair of trip levers (201, 202) arranged on one side of the at least one drive member 1, and a push rod 3 arranged between the pair of trip levers (201, 202). The drive member 1 is arranged between the actuating mechanism 8 and the moving contact assembly 6, and the drive member 1 is rotatably coupled to the bracket. The drive member 1 can be driven by the actuating mechanism 8 relative to the bracket, and causes the moving contact assembly 6 to move relative to the stationary contact 7. In some embodiments, the retaining device may include two drive members 1 arranged along the axis of the trip levers.

[0033] The drive element 1 includes a body. The body includes a rotating portion 11. The body is rotatably coupled to a bracket via the rotating portion 11, and the rotation axis of the rotating portion 11 coincides with the rotation axis of the actuating mechanism 8. In some embodiments, the rotating portion 11 further includes a pair of drive portions 15, each coupled to the body and protruding from the body in a radial direction perpendicular to the rotation axis of the rotating portion 11. The actuating mechanism 8 can contact the drive portions 15, thereby causing the drive element 1 to rotate around the rotating portion 11 between an open and closed position by pushing the drive portions 15. In some embodiments, the holding device may include two drive elements 1, with the rotating portions 11 of the drive elements 1 coinciding. The actuating mechanism 8 can simultaneously drive both drive elements 1 to rotate, thereby improving the stability of the dual power supply transfer switch switching.

[0034] like Figure 2 and Figure 3 As shown, in some embodiments, a transmission member 5 is further provided on the side of the drive member 1 facing the moving contact assembly 6. The transmission member 5 includes a connecting shaft 51 and a drive shaft 53 respectively coupled to the drive member 1, and a crank arm 52 coupled to the moving contact assembly 6. The crank arm 52 surrounds the connecting shaft 51, and one end of the crank arm 52 extends radially along the connecting shaft 51. The connecting shaft 51 is coupled to the rotating part 11 of the drive member 1, and the axis of the connecting shaft 51 coincides with the rotation axis of the rotating part 11.

[0035] The drive shaft 53 is arranged parallel to the rotating shaft 21, and a predetermined distance is spaced between the drive shaft 53 and the rotating shaft 21. One end of the drive shaft 53 is coupled to the radially protruding end of the crank arm 52, and the other end is coupled to the coupling part 14 of the drive member 1. In this way, if the drive member 1 swings between the closed and open positions under the drive of the actuating mechanism 8, the moving contact assembly 6 can rotate around the connecting shaft 51 through the transmission action of the transmission member 5. In this way, the moving contact arranged on the moving contact assembly 6 in the radial direction along the connecting shaft 51 can contact or separate from the stationary contact 7. That is, the closing and opening operations of the dual power supply transfer switch are realized.

[0036] A pair of trip levers 201 and 202 of the retaining device are arranged side by side on one side of the drive member 1 and are rotatably coupled to the bracket. The pair of trip levers 201 and 202 can rotate between a blocking position and a yielding position. During the blocking position, the trip levers can contact the drive member 1, thereby limiting the swing of the drive member 1.

[0037] For example, if the trip lever rotates to the blocking position, the rotation range of the trip lever and the drive member 1 at least partially overlaps. During the rotation of the drive member 1 from the open position to the closed position under the drive of the actuating mechanism 8, the drive member 1 can contact the trip lever and be restricted by the trip lever to the ready-to-close energy storage position. In this state, the actuating mechanism 8 can continuously compress the drive member 1 under the elastic force of the internal spring. That is, the drive member 1 is in an energy storage state. Once the trip lever rotates to the avoidance position, the drive member 1 can quickly rotate to the closed position, thereby realizing the rapid closing of the dual power supply transfer switch.

[0038] If the dual-power transfer switch is currently in the closed state (drive element 1 is in the closed position), the actuating mechanism 8 applies a force to drive element 1 to rotate towards the open position. At this time, drive element 1 can remain in the standby open energy storage position under the obstruction of the trip lever. In the standby open energy storage position, the moving contact assembly 6 and the stationary contact 7 can still maintain contact, and drive element 1 remains in the energy storage state under the elastic force of the spring inside the actuating mechanism 8 and the limiting action of the trip lever. Once the trip lever rotates to the avoidance position, drive element 1 can quickly rotate to the open position under the drive of the actuating mechanism 8, thereby realizing the rapid opening of the dual-power transfer switch.

[0039] Specifically, the drive member 1 further includes a pair of latching protrusions, which are respectively coupled to the body and protrude from the body in different radial directions. The pair of latching protrusions includes a first latching protrusion 12 and a second latching protrusion 13. The first latching protrusion 12 and the second latching protrusion 13 are respectively coupled to the body, and the first latching protrusion 12 protrudes from the rotating part 11 in a first radial direction, and the second latching protrusion 13 protrudes from the rotating part 11 in a second radial direction. There may be a predetermined angle between the first radial direction and the second radial direction. When the drive member 1 rotates between the closed position and the open position, the first latching protrusion 12 and / or the second latching protrusion 13 may contact the circumferential surface of the trip lever and be limited by the trip lever.

[0040] Figure 5 A schematic diagram of the overall structure of the trip lever according to some embodiments of the present disclosure is shown. Figure 5 As shown, the trip lever also includes a clearance portion formed on the circumferential surface of the trip lever. After the trip lever can rotate around its own axis from the blocking position to the clearance position, the clearance portion can clear the first latch protrusion 12 and the second latch protrusion 13 of the drive member 1, so that the drive member 1 can smoothly complete the rotation.

[0041] In some embodiments, the release lever includes a rotating shaft 21 rotatably coupled to a bracket. The circumferential surface of the rotating shaft 21 may overlap with the rotation range of the first latch protrusion 12 and the second latch protrusion 13. Thus, the rotating shaft 21 can restrict the rotation of the drive member 1. In some embodiments, the clearance portion may be a semi-shaft groove 22 formed on the circumferential surface of the rotating shaft 21, the semi-shaft groove 22 being recessed into the rotating shaft 21 in the radial direction. When the release lever rotates a predetermined angle from the blocking position to the clearance position, the semi-shaft groove 22 faces the drive member 1. The semi-shaft groove 22 can clearance the first latch protrusion 12 and the second latch protrusion 13.

[0042] In some embodiments, the trip lever further includes a drive protrusion 23 disposed on the circumferential surface of the rotating shaft 21 and protruding from the circumferential surface of the rotating shaft 21 in the radial direction. The retaining device further includes a push rod 3 disposed between a pair of trip levers, with the axis of the push rod 3 perpendicular to the axis of the trip levers. The push rod 3 is coupled to an electromagnet 31 of a dual-power transfer switch and is adapted to push against the protrusion under the drive of the electromagnet 31, causing the rotating shaft 21 to rotate about its own axis. Thus, the half-shaft groove 22 of the trip lever is aligned with the drive member 1, thereby releasing the restriction on the drive member 1.

[0043] In some embodiments, the bidirectional holding device further includes a reset assembly 4, which is disposed at one end of the trip lever and includes a reset lever 41 and a reset spring 42. The reset lever 41 is coupled to the end of the rotating shaft 21 and is adapted to extend in the radial direction. The reset spring 42 is disposed between the bracket and the reset lever 41 and is adapted to be compressed during the rotation of the rotating shaft 21 by the push rod 3, and then pushes the reset lever 41 after the push rod 3 retracts, thereby causing the reset lever 41 to reset the trip lever. After the trip lever is reset, the half-shaft groove 22 is offset from the drive member 1 by a predetermined angle, so that the trip lever can again prevent the drive member 1 from swinging. In some embodiments, the reset spring 42 may be a torsion spring. In some other embodiments, the reset spring 42 may also be a compression spring, a spring sheet, etc.

[0044] Return to reference Figure 3 and Figure 4 ,exist Figure 3 and Figure 4 In the middle, the drive unit 1 is in the open position, and the first latch protrusion 12 of the drive unit 1 abuts against the bottom surface of the half shaft groove 22 of the first trip rod 201 of the pair of trip rods, so that the first trip rod 201 cannot rotate to the blocking position under the action of the reset assembly 4.

[0045] Figure 6 and Figure 7 Schematic diagrams from different perspectives are shown for the holding device according to some embodiments of the present disclosure with the drive member in the standby closing energy storage position. For example... Figure 6 and Figure 7 As shown, when the drive unit 1 is in the open position, the actuating mechanism 8 can rotate under the drive of the internal motor (e.g., in...). Figure 6 (Rotating counterclockwise from a downward perspective). During this period, the spring of the actuating mechanism 8 is compressed, and the angle of the spring changes. If the actuating mechanism 8 rotates past its dead point, the spring can abut against the drive part 15 of the drive member 1 and push the drive member 1 to rotate toward the closed position.

[0046] Because the first latching protrusion 12 abuts against the half-shaft groove 22 of the first tripping lever 201 in the open state, the driving member 1 can rotate towards the closing position. When the first latching protrusion 12 leaves the half-shaft groove 22 of the first tripping lever 201, the first tripping lever 201 is reset to the blocking position under the action of the reset assembly 4. Thus, the first tripping lever 201 can contact the second latching protrusion 13, thereby restricting the driving member 1 to the ready-to-close energy storage position.

[0047] Figure 8 and Figure 9 Schematic diagrams from different perspectives are shown for the holding device according to some embodiments of the present disclosure with the drive member in the closed position. For example... Figure 8 and Figure 9 As shown, when the drive unit 1 is in the standby closing and energy storage position, the electromagnet 31 drives the push rod 3 to push the drive protrusion 23 of the trip lever. A pair of trip levers (201, 202) rotate to the avoidance position respectively, and the first trip lever 201 releases its obstruction to the second latch protrusion 13.

[0048] Thus, the drive element 1 can rotate to the closed position under the push of the actuating mechanism 8, thereby bringing the moving contact into contact with the stationary contact 7. In this way, the rotation angle of the drive element 1 from the open position to the closed position can be shortened, thereby reducing the impact of the moving contact assembly 6 on the stationary contact 7. Furthermore, the reduction in the rotation angle of the drive element 1 also improves the switching speed of the dual power supply transfer switch.

[0049] In some embodiments, the coupling portion 14 of the drive member 1 for coupling the drive shaft 53 can be arranged close to the first latch protrusion 12, thereby further shortening the swing distance from the standby energy storage position to the closed position, thereby further improving the switching speed of the dual power supply transfer switch.

[0050] Figure 10 and Figure 11 Schematic diagrams from different perspectives are shown for the holding device according to some embodiments of the present disclosure with the drive member in the standby opening and energy storage position. For example... Figure 10 and Figure 11 As shown, when the drive unit 1 is in the closed position, the actuating mechanism 8 rotates due to the action of the internal drive motor (e.g., in...). Figure 10(rotating clockwise from the lower edge of the viewpoint), the spring of the action mechanism 8 is compressed.

[0051] As the actuating mechanism 8 rotates past its dead center, it provides the driving member 1 with an elastic force to rotate towards the open position. However, at this time, due to the obstruction of the first latching protrusion 12 by the second tripping lever 202, the driving member 1 can remain in the standby open energy storage position. In the standby open energy storage position, the moving contact assembly 6 can still maintain stable contact with the stationary contact 7, so that the dual power supply transfer switch is in the closed state. If the electromagnet 31 drives the push rod 3, the push rod 3 pushes the driving protrusion 23 to rotate the first tripping lever 201 and the second tripping lever 202 to the avoidance position, the driving member 1 can rotate downwards from the actuating mechanism 8 to the open position. Figure 3 and Figure 4 The circuit breaker is in the open position shown. At this time, the moving contact assembly 6 is separated from the stationary contact 7, and the dual power supply transfer switch is open.

[0052] Various implementations of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed implementations. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described implementations. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to technology in the market, or to enable others skilled in the art to understand the various implementations disclosed herein.

Claims

1. A holding device for reducing the closing impact, characterized in that Comprising: at least one driving member (1) disposed between an operating mechanism (8) of a double power transfer switch and a movable contact assembly (6), and adapted to be driven by the operating mechanism (8) to rotate between a closed position and an open position to drive the movable contact assembly (6) to operate, the driving member (1) comprising: a body comprising a rotating portion (11), and the body is rotatably coupled to a bracket of the double power transfer switch through the rotating portion; and a pair of snap projections protruding from the body along different radial directions of the rotating portion (11) respectively; a pair of trip levers disposed side by side on one side of the driving member (1) in a radial direction, each trip lever being coupled to the bracket and adapted to rotate between a blocking position and a avoiding position, in the blocking position, the trip lever blocks the swing of the driving member (1) between the closed position and the open position, and the trip lever comprises an avoiding portion arranged to avoid the pair of snap projections during the trip lever is in the avoiding position; and a push rod (3) coupled to the pair of trip levers and adapted to drive the pair of trip levers to rotate.

2. The holding device according to claim 1, characterized in that The trip lever further comprises: a rotating shaft (21) rotatably coupled to the bracket and adapted to rotate between the blocking position and the avoiding position, and the avoiding portion comprises at least one half shaft slot (22) formed on the circumferential surface of the rotating shaft (21) and aligned with the at least one driving member (1) in a radial direction.

3. The holding device according to claim 2, characterized in that The trip lever further comprises: a driving projection (23) arranged on the circumferential surface of the rotating shaft (21) and protruding from the rotating shaft (21) in a radial direction, and wherein the push rod (3) is coupled to an electromagnet (31) of the double power transfer switch and adapted to push the driving projection (23) under the drive of the electromagnet (31) to rotate the rotating shaft (21) around its own axis.

4. The holding device of claim 1, wherein Further comprising: a reset assembly (4) arranged at one end of the trip lever in an axial direction, and comprising: a reset lever (41) coupled to the trip lever and adapted to extend along the radial direction of the trip lever; and a reset spring (42) arranged between the bracket and the reset lever (41). Further comprising a transmission member (5) disposed between the driving member (1) and the movable contact assembly (6), and comprising:

5. The holding device of claim 1, wherein a connecting shaft (51) passing through the rotating portion (11) and extending towards the movable contact assembly (6), the connecting shaft (51) being aligned with the rotating portion (11) in an axis direction; a crank arm (52) wrapped around the outside of the connecting shaft (51) and extending along the radial direction of the connecting shaft (51), the crank arm (52) being coupled to the movable contact assembly (6) to drive the movable contact assembly (6) to rotate around the axis of the connecting shaft (51); and ​ A driving shaft (53) is arranged between the driving member (1) and the toggle arm (52) and is spaced apart from the connecting shaft (51) by a predetermined distance to drive the toggle arm (52) to rotate around the connecting shaft (51) during rotation of the driving member (1) between the closed position and the open position.

6. The holding device according to claim 5, characterized in that The driving member (1) further comprises: A coupling portion (14) is formed on the body and is arranged close to the first buckle protrusion (12) of the pair of buckle protrusions, and the coupling portion (14) is coupled with the driving shaft (53).

7. The holding device of claim 1, wherein The driving member (1) further comprises a pair of driving portions (15) arranged on opposite sides of the body respectively and adapted to be coupled with the action mechanism (8).

8. The holding device according to any one of claims 1-7, characterized in that The first buckle protrusion (12) of the pair of buckle protrusions is at least partially in contact with the half shaft slot (22) of the first trip bar (201) of the pair of trip bars during the driving member (1) being in the open position, so as to limit the first trip bar (201) to rotate to the blocking position.

9. The holding device of claim 8, wherein The second buckle protrusion (13) of the pair of buckle protrusions is in contact with the first trip bar (201) during the driving member (1) being in the standby closed energy storage position between the open position and the closed position, and is limited by the first trip bar (201) to rotate to the closed position.

10. The holding device according to any one of claims 1-7, characterized in that The first buckle protrusion (12) of the pair of buckle protrusions is in contact with the second trip bar (202) of the pair of trip bars during the driving member (1) being in the standby open energy storage position between the open position and the closed position, and is limited by the second trip bar (202) to rotate to the open position.

11. A dual power transfer switch, characterized by Comprise: A bracket; At least one action mechanism (8); At least one electromagnet (31) adapted to act based on a closing signal or an opening signal; A moving contact assembly (6); and At least one retaining device according to any one of claims 1-10 of the present disclosure is arranged between the at least one action mechanism (8) and the moving contact assembly (6).

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