Three-position dual-power change-over switch

Abstract

According to the three-position dual-power-supply change-over switch, on one hand, a matched locking structure of a connecting rod set and a lock catch frame is designed, the locking state of the connecting rod set and the lock catch frame can be changed through power-on and power-off of a set of coils, then adjustment of the stop position of the connecting rod set is achieved, and therefore switching of the switching-on state and the switching-off state is achieved; on the other hand, the debugging shaft runs in the debugging groove and is matched with the guide block to change the running track, so that the closing switching of the common switch and the standby switch is realized; compared with a traditional mode that two sets of mechanical structures are matched with two sets of coils for operation, the cost of parts and the size occupied by the mechanical structures can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of electrical switches, in particular to a three-position dual-power transfer switch. Background Art

[0002] Traditional dual-power transfer switches feature two switches, one for normal and one for standby. These switches are connected to an operating mechanism via an input shaft. Two sets of electromagnetic coils in the operating mechanism drive a rotating shaft to close and open the two switches, or they can be switched manually via a handle. These rotating shafts are connected to output shafts on the normal and standby sides via opening and closing assemblies. These output shafts connect to specific moving contacts for opening and closing with the static contacts. The electromagnetic coils are a major cost component of a dual-power transfer switch. Having two sets of electromagnetic coils not only increases the cost but also makes the overall structure larger. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a three-position dual power transfer switch, which realizes the transmission of opening and closing by a coil through structural design, reduces equipment cost and reduces the size of the equipment.

[0004] The present invention adopts the following technical scheme: a three-position dual power transfer switch, comprising a bracket, a coil installed in the bracket and a connecting rod group, the connecting rod group is movably arranged, the iron core of the coil is linked with the connecting rod group, and when the coil is energized, the iron core is driven to expand and contract, thereby driving the movement of the connecting rod group; the connecting rod group comprises a first swing frame and a second swing frame, the first swing frame and the second swing frame are both rotatably arranged on the bracket through an axis structure, a driving shaft is horizontally arranged on the iron core, and the first swing frame and the second swing frame are both sleeved on the driving shaft through a first waist-shaped hole to form a structural linkage; the second swing frame is U-shaped as a whole, and the bracket is further provided with two sides corresponding to the second swing frame. The locking frame is externally connected to a tension spring, and the locking frame includes a second waist-shaped hole, a limiting hole, a clamping wall and a contact wall. The second waist-shaped hole is sleeved on the first fixed axis on the bracket, thereby allowing the locking frame to have a first degree of freedom to move forward and backward along the second waist-shaped hole based on the radial direction of the first fixed axis, and a second degree of freedom to move axially along the first fixed axis based on the axial direction of the first fixed axis. The limiting hole is sleeved on the second fixed axis on the bracket, and the limiting hole has a space for the second fixed axis to move on the first degree of freedom, the space including a short space with a shorter size and a long space with a longer size. The front and rear positions of the second swing frame are respectively provided with a lock hook and a push plate that cooperate with the clamping wall and the contact wall;

[0005] When the second swing frame moves to the first stop position, the push plate abuts against the abutment wall and pushes the lock frame to move to the first stop position in the first degree of freedom. At this time, the second fixed axis moves from the long space to the short space and is stuck at the end of the short space to form a stop limit of the lock frame. The tension spring is stretched and stored. The first stop position is the closed position of the dual power transfer switch.

[0006] When the coil is energized to drive the iron core to move, the second swing frame moves to the second stop position. During the process, the lock hook abuts against the inner wall of the lock frame from the inside and pushes the lock frame to move in the second degree of freedom. When the lock hook passes the lock frame and the coil is de-energized to reset the second swing frame, the lock hook hooks at the wall and abuts against the second fixed axis to enter the long space. The lock frame and the second swing frame stay in the second stop position, which is the opening position of the dual power conversion switch.

[0007] When the coil is energized again to drive the iron core to move, the second swing frame moves to make the lock hook separate from the wall, and the lock frame is reset by the elastic force of the tension spring. When the coil is de-energized, the second swing frame is reset and drives the lock frame to move to the first stop position;

[0008] The first swing frame is externally connected to a debugging shaft, and a debugging slot is provided on the bracket. The debugging shaft is accommodated in the debugging slot for movement. The debugging slot includes an opening position in the middle and a main closing position and a secondary closing position on both sides; it also includes a movable guide block provided corresponding to the debugging shaft and the debugging slot. The guide block is adjusted to the main closing position or the secondary closing position of the debugging slot through movement, blocking the debugging shaft from entering one side and guiding it to the other side.

[0009] As an improvement, the inner side of the lock frame is provided with an arc-shaped inner wall that contacts and cooperates with the lock hook.

[0010] As an improvement, the second swing frame is externally connected to a tension spring, and when the second swing frame moves from the first rest position to the second rest position, the tension spring is stretched to store force.

[0011] As an improvement, the debugging slot is in an inverted "Y" shape, with the opening position located in the upper middle part, the main closing position and the auxiliary closing position located in the lower parts on both sides, and the guide block moves at the intersection of the "Y" shape to one side of the main closing position or the auxiliary closing position for blocking.

[0012] As an improvement, the guide block is rotatably arranged on the bracket via a rotating shaft.

[0013] As an improvement, the end of the guide block extending into the intersection of the debugging slot is set as a "V"-shaped guide wall. When the guide block blocks the debugging shaft from entering the main closing position or the auxiliary closing position on one side, the "V"-shaped guide wall guides the debugging shaft to move to the other side.

[0014] As an improvement, the guide block is driven by a small coil to movably adjust its position.

[0015] As an improvement, the small iron core of the small coil is connected to a debugging piece, the guide block is provided with a toggle arm, and the debugging piece and the toggle arm are engaged and coordinated.

[0016] The beneficial effects of the present invention are as follows: on the one hand, by relying on the innovative design of the connecting rod group and the lock frame structure, the state switching of closing and opening is realized when the overall structure moves, and the movement of the structure can be driven by a set of coils; on the other hand, the debugging shaft runs in the debugging slot and cooperates with the guide block to change the running trajectory, thereby realizing the closing and switching of the common and standby two-way switches; compared with the traditional method of two sets of mechanical structures cooperating with two sets of coils, the component cost and the volume occupied by the mechanical structure can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention when the switch is open. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when the switch is open. Figure 2 .

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention after the bracket is hidden when the switch is opened.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention when one side is closed.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention after the bracket is hidden when one side is closed.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention when the switch is closed on the other side.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the present invention after the bracket is hidden when the switch is closed on the other side. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 、 2, 3, 4, 5, 6, 7 are specific embodiments of the three-position dual power switch of the present invention. This embodiment includes a bracket 1, a coil 2 installed in the bracket 1 and a connecting rod group 3. The connecting rod group 3 is movably arranged. The iron core 21 of the coil 2 is linked with the connecting rod group 3. When the coil 2 is energized, the iron core 21 is driven to expand and contract, thereby driving the movement of the connecting rod group 3. The connecting rod group 3 includes a first swing frame 31 and a second swing frame 32. The first swing frame 31 and the second swing frame 32 are both rotatably arranged on the bracket 1 through an axis structure. A driving shaft 22 is horizontally arranged on the iron core 21. The first swing frame 31 and the second swing frame 32 are both sleeved on the driving shaft 22 through a first waist-shaped hole 33 to form a structural linkage. The second swing frame 32 is U-shaped as a whole. A locking frame 4 is also arranged on both sides of the bracket 1 corresponding to the second swing frame 32. The locking frame 4 is externally connected to a tension spring. The locking frame 4 includes a second waist-shaped hole 41, a limiting hole 42, a card wall 43 and a contact wall 44. The second waist-shaped hole 41 is sleeved on the first fixed axis 11 on the bracket 1, thereby allowing the locking frame 4 to have a first degree of freedom to move forward and backward along the second waist-shaped hole 41 based on the radial direction of the first fixed axis 11, and a second degree of freedom to move axially along the first fixed axis 11 based on the axial direction of the first fixed axis 11. The limiting hole 42 is sleeved on the second fixed axis 12 on the bracket 1, and the limiting hole 42 has a space for the second fixed axis 12 to move in the first degree of freedom. The space includes a short space 421 with a shorter size and a long space 422 with a longer size. The front and rear positions of the second swing frame 32 are respectively provided with a lock hook 321 and a push plate 322 that cooperate with the card wall 43 and the contact wall 44;

[0026] When the second swing frame 32 moves to the first stop position, the push plate 322 abuts against the abutting wall 44 and pushes the lock frame 4 to move in the first degree of freedom to the first stop position. At this time, the second fixed shaft 12 moves from the long space 422 to the short space 421 and is stuck at the end of the short space 421 to form a stop limit for the lock frame 4. The tension spring is stretched and stored. The first stop position is the closed position of the dual power transfer switch.

[0027] When the coil 2 is energized to drive the iron core 21 to move, the second swing frame 32 moves to the second stop position. During this process, the lock hook 321 abuts against the inner wall of the lock frame 4 from the inside and pushes the lock frame 4 to move in the second degree of freedom. When the lock hook 321 passes the lock frame 4 and the coil 2 is de-energized to reset the second swing frame 32, the lock hook 321 hooks on the locking wall 43 and abuts against the second fixed axis 12 to enter the long space 422. The lock frame 4 and the second swing frame 32 stay in the second stop position, which is the open position of the dual power conversion switch.

[0028] When the coil 2 is energized again to drive the iron core 21 to move, the second swing frame 32 moves to disengage the lock hook 321 from the locking wall 43, and the lock frame 4 is reset by the elastic force of the tension spring. When the coil 2 is de-energized, the second swing frame 32 is reset, thereby driving the lock frame 4 to move to the first rest position.

[0029] The first swing frame 31 is externally connected to a debugging shaft 5, and a debugging slot 6 is provided on the bracket 1. The debugging shaft 5 is accommodated in the debugging slot 6 for movement. The debugging slot 6 includes an opening position 61 in the middle and a main closing position 62 and an auxiliary closing position 63 on both sides; it also includes a movable guide block 7 arranged corresponding to the debugging shaft 5 and the debugging slot 6. The guide block 7 is adjusted to the main closing position 62 or the auxiliary closing position 63 of the debugging slot 6 by movement, blocking the debugging shaft 5 from entering the blocking side and guiding it to the other side.

[0030] When the present invention is used, Figure 1 、 2 3 is the opening position of the dual power conversion switch. The opening position corresponds to the locking frame 4 and the second swing frame 32 staying in the second stop position as shown in the figure, the lock hook 321 is stuck in the card wall 43, the second fixed axis 12 is located in the long space 422, and the tension spring is stretched so that the locking frame 4 tends to reset to the left.

[0031] When closing the circuit breaker, Figure 4 、 5 As shown in Figures 6 and 7, the coil 2 is energized, causing the iron core 21 to descend, and the driving shaft 22 descends to drive the second swing frame 32 to swing. After the lock hook 321 descends, the limit on the card wall 43 is released, thereby releasing the lock frame 4, and the lock frame 4 moves to the left through the restoring force of the tension spring until the second fixed axis 12 is against the end of the long space 422 for limitation; thereafter, the coil 2 is de-energized, and the iron core 21 can be reset upward by the elastic member sleeved thereon, thereby driving the second swing frame 32 and the first swing frame 31 to move to the first stop position, which is the closing position. During this movement, the first swing frame 31 drives the debugging shaft 5 to move from the opening position 61 of the debugging slot 6 to the main closing position. When the second swing frame 32 is in the process of swinging, the push plate 322 on the other side contacts the contact wall 44 of the lock frame 4 and pushes the lock frame 4 to the right again, thereby making the second fixed shaft 12 move relatively to the left along the long space 422 until it reaches the right end of the short space 421. The lock frame 4 will rotate to make the second fixed shaft 12 fall into the short space 421 and press against the right end to form a structural limit of the lock frame 4. During this process, the tension spring is stretched and stored, and the lock frame 4 and the second swing frame 32 stay in the first stop position.

[0032] When the switch is opened, the coil 2 is energized, and the iron core 21 is lowered, the locking hook 321 swings downward with the second swing frame 32, and the locking hook 321 pushes the locking bracket 4 outward, until the locking hook 321 passes through the locking bracket 4, the coil 2 is de-energized, the iron core 21 is reset upward, the second swing frame 32 is reset upward and abuts against the locking bracket 4, the locking bracket 4 after moving upward makes the second fixed shaft 12 disengage from the short space 421 and enters the long space 422, and the locking bracket 4 is limited by the locking hook 321 hooked at the clamping wall 43 to prevent it from moving to the left. The first swing frame 31 moves to the second rest position, and the adjusting shaft 5 moves to the open position 61.

[0033] The above action process is realized by a set of coil 2 and iron core 21, compared with the traditional two groups of mechanical structure cooperating with two groups of coils to complete the switching of two-circuit closing, which can greatly reduce the cost of components and the volume occupied by mechanical structure. The second swing frame 32 with U-shaped structure cooperates with the locking bracket 4 on both sides to realize the locking of the structure on both sides, which can ensure that the force of the components is uniform and stable, and avoid the failure caused by local or unilateral wear of the transmission structure after long-term use.

[0034] On the other hand, for the switching of the commonly used and standby two-way switch, the following innovative design is realized, when the switch is opened, the adjusting shaft 5 moves from the main closing position 62 or the auxiliary closing position 63 of the adjusting groove 6 to the open position 61, when the switch is closed, the adjusting shaft 5 moves from the open position 61 of the adjusting groove 6 to the main closing position 62 or the auxiliary closing position 63; The guide block 7 is arranged to block the main closing position 62 or the auxiliary closing position 63, so that the adjusting shaft 5 moves to the other side of the auxiliary closing position 63 or the main closing position 62; When the commonly used and standby two-way switch needs to be switched, the position of the guide block 7 is adjusted, and after the adjustment is completed, the guide block 7 can move to the unblocked side. Figures 1-5 For example, the guide block 7 blocks the auxiliary closing position 63, if the switch is closed at this time, the adjusting shaft 5 will move to the main closing position 62, and then the commonly used circuit will be closed as shown in Figure 4 、 5 If the guide block 7 blocks the main closing position 62, then the adjusting shaft 5 will move to the auxiliary closing position 63, and then the standby circuit will be closed as shown in Figure 6 、 7As shown, the standby circuit is closed. The power output mechanism corresponding to the debugging shaft 5 is connected to an externally connected swing arm 9. When the debugging shaft 5 is closed in the main closing position 62 or the auxiliary closing position 63, the swing arm 9 swings left or right, thereby driving the output shaft 91 to complete the left or right rotation. The output shaft 91 is externally connected to the moving contact. The left or right rotation causes the moving contact to contact and close with the corresponding normal side static contact or standby side static contact. The motion trajectory of the debugging shaft 5 is adjusted by the guide block 7 to achieve switching between the two circuits, thereby greatly simplifying the power input and output mechanism, greatly simplifying the component structure, and reducing the volume occupied by the mechanism while controlling costs.

[0035] As an improved specific implementation manner, an arc-shaped inner wall 45 is provided on the inner side of the lock frame 4 to contact and cooperate with the lock hook 321 .

[0036] like Figure 3 、 5 As shown in Figures 7 and 8, the arc-shaped inner wall 45 corresponds to the position where the lock hook 321 is in contact during operation, which provides a gentler contact arc surface. The corresponding contact surface of the lock hook 321 is also set to an arc surface, which reduces hard collision wear when the lock hook 321 moves downward to push open the lock frame 4, thereby extending the service life of the component.

[0037] As an improved specific implementation manner, the second swing frame 32 is externally connected to a tension spring, and when the second swing frame 32 moves from the first rest position to the second rest position, the tension spring is stretched to store force.

[0038] like Figure 1 、 4 As shown in Figure 6, a tension spring is provided to provide a restoring force for the second swing frame 32. When the second swing frame 32 is driven by the coil 2 to swing, the tension spring is stretched. After the coil 2 is powered off, the second swing frame 32 can be quickly reset to the first stop position by relying on the restoring force of the tension spring, thereby ensuring the stability of the closing position and driving the lock frame 4 to move to the first stop position.

[0039] As an improved specific implementation method, the debugging slot 6 is in an inverted "Y" shape, the opening position 61 is located in the middle upper part, the main closing position 62 and the auxiliary closing position 63 are located in the lower parts on both sides, and the guide block 7 moves at the intersection of the "Y" shape to the main closing position 62 or the auxiliary closing position 63 to block.

[0040] like Figure 1 、 2As shown in Figures 4 and 6, the specific debugging slot 6 forms an opening position 61 in the middle upper part, and a main closing position 62 and an auxiliary closing position 63 in the lower part on both sides. The main closing position 62 and the auxiliary closing position 63 are symmetrically arranged. When the debugging shaft 5 falls and is guided to the closing position on one side by the guide block 7, the position of the debugging shaft 5 can be kept stable; when the debugging shaft 5 moves to the opening position 61, the left and right positions of the guide block 7 can be adjusted. The guide block 7 blocks the debugging shaft 5 on one side at the intersection of the "Y" shape and guides it to the other side, which can ensure the smooth movement trajectory of the debugging shaft 5.

[0041] As an improved specific implementation manner, the guide block 7 is rotatably provided on the bracket 1 via a rotating shaft.

[0042] like Figures 1-7 As shown, the rotating shaft is arranged at the lower center axis position of the debugging slot 6, so that the guide block 7 can be swung left and right to adjust its position during rotation, and the switching operation is completed at the intersection position of the debugging slot 6.

[0043] As an improved specific implementation method, one end of the guide block 7 extending into the intersection position of the debugging slot 6 is set as a "V"-shaped guide wall 71. When the guide block 7 blocks the debugging shaft 5 from entering the main closing position 62 or the auxiliary closing position 63 on one side, the "V"-shaped guide wall 71 guides the debugging shaft 5 to move to the other side.

[0044] like Figures 1-5 As shown, when the "V"-shaped guide wall 31 is located at the mouth of the main closing position 62 or the auxiliary closing position 63, it can rely on the inclined surface on one side to effectively block the entry of the debugging shaft 5, and the inclined surface and the groove wall on the other side form a continuous guiding surface, which can guide the debugging shaft 5 to move smoothly to the other side to complete the closing.

[0045] As an improved specific implementation manner, the guide block 7 is driven by a small coil 8 to adjust its position.

[0046] like Figure 3 、 5 As shown in , 7, as a preference, the position of the guide block 7 can be adjusted by setting a small coil 8, and then the circuits of the common side and the standby side can be automatically switched through the circuit of the dual power conversion switch; the size of the small coil 8 is for the coil 2 that controls the opening and closing of the switch, because there are many integral parts to be driven by the input components such as the connecting rod group 3, the debugging shaft 5, and the output components such as the swing arm 9, the output shaft 91, the moving contact, etc., a larger coil 2 is used for electromagnetic drive to close and open the switch; the guide block 7 itself has no redundant linkage components, so a small coil 8 with lower cost and smaller volume can be used to achieve this; compared with the traditional structure, it also has better cost and volume advantages.

[0047] As an improved specific implementation method, the small iron core 81 of the small coil 8 is connected to a debugging piece 82, and the guide block 7 is provided with a toggle arm 72. The debugging piece 82 and the toggle arm 72 are engaged and coordinated.

[0048] like Figures 1-7 As shown, the debugging piece 82 and the toggle arm 72 cooperate with each other to cause the small core 81 to move up or down when the small coil 8 is energized or de-energized, thereby driving the debugging piece 82 to adjust the up and down movement of the toggle arm 72, thereby achieving left and right position adjustment of the guide block 7. Preferably, the debugging piece 82 or the toggle arm 72 can also be extended outside the bracket 1 to facilitate the operator to use a tool to toggle the debugging piece 82 or the toggle arm 72 to manually switch the main and auxiliary circuits.

[0049] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. A three-position dual power switch, comprising a bracket (1), a coil (2) mounted in the bracket (1), and a connecting rod group (3), wherein the connecting rod group (3) is movably arranged, and an iron core (21) of the coil (2) is linked to the connecting rod group (3), and when the coil (2) is energized, the iron core (21) is driven to expand and contract, thereby driving the movement of the connecting rod group (3); characterized in that: The connecting rod group (3) includes a first swing frame (31) and a second swing frame (32), the first swing frame (31) and the second swing frame (32) are both rotatably arranged on the bracket (1) through an axis structure, the iron core (21) is horizontally provided with a driving shaft (22), the first swing frame (31) and the second swing frame (32) are both sleeved on the driving shaft (22) through a first waist-shaped hole (33) to form a structural linkage; the second swing frame (32) is U-shaped as a whole, and locking frames (4) are further provided on both sides of the bracket (1) corresponding to the second swing frame (32), the locking frames (4) are externally connected to a tension spring, the locking frames (4) include a second waist-shaped hole (41), a limiting hole (42), a card wall (43) and a contact wall (44), the second waist-shaped hole (41) and the limiting hole (42) are provided. The shaped hole (41) is sleeved on the first fixed axis (11) on the bracket (1), thereby allowing the lock frame (4) to have a first degree of freedom of moving forward and backward along the second waist-shaped hole (41) based on the radial direction of the first fixed axis (11), and a second degree of freedom of moving axially along the first fixed axis (11) based on the axial direction of the first fixed axis (11). The limiting hole (42) is sleeved on the second fixed axis (12) on the bracket (1), and the limiting hole (42) has a space for the second fixed axis (12) to move on the first degree of freedom, and the space includes a short space (421) with a shorter size and a long space (422) with a longer size. The front and rear positions of the second swing frame (32) are respectively provided with a lock hook (321) and a push plate (322) that cooperate with the card wall (43) and the contact wall (44); When the second swing frame (32) moves to the first stop position, the push plate (322) abuts against the abutting wall (44) and pushes the lock frame (4) to move to the first stop position in the first degree of freedom. At this time, the second fixed axis (12) moves from the long space (422) to the short space (421) and is stuck at the end of the short space (421) to form a stop limit of the lock frame (4). The tension spring is stretched and stored. The first stop position is the closing position of the dual power conversion switch. When the coil (2) is energized to drive the iron core (21) to move, the second swing frame (32) moves to the second stop position. During the process, the lock hook (321) contacts the inner wall of the lock buckle frame (4) from the inside and pushes the lock buckle frame (4) to move in the second degree of freedom. When the lock hook (321) passes the lock buckle frame (4) and the coil (2) is de-energized to reset the second swing frame (32), the lock hook (321) is hooked at the card wall (43) and contacts the second fixed axis (12) to enter the long space (422). The lock buckle frame (4) and the second swing frame (32) stay at the second stop position, which is the opening position of the dual power conversion switch. When the coil (2) is energized again to drive the iron core (21) to move, the second swing frame (32) moves to cause the lock hook (321) to separate from the clamping wall (43), and the lock frame (4) is reset by the elastic force released by the tension spring. When the coil (2) is de-energized, the second swing frame (32) is reset and drives the lock frame (4) to move to the first stop position. The first swing frame (31) is externally connected to a debugging shaft (5); a debugging slot (6) is provided on the bracket (1); the debugging shaft (5) is accommodated in the debugging slot (6) for movement; the debugging slot (6) includes an opening position (61) located in the middle and a main closing position (62) and a secondary closing position (63) located on both sides; and further includes a movable guide block (7) provided corresponding to the debugging shaft (5) and the debugging slot (6); the guide block (7) is adjusted to the main closing position (62) or the secondary closing position (63) of the debugging slot (6) by movement, thereby blocking the debugging shaft (5) from entering one side and guiding it to the other side.

2. The three-position dual power transfer switch according to claim 1, characterized in that: The inner side of the lock frame (4) is provided with an arc-shaped inner wall (45) that contacts and cooperates with the lock hook (321).

3. The three-position dual power transfer switch according to claim 1, characterized in that: The second swing frame (32) is externally connected to a tension spring, and when the second swing frame (32) moves from the first stop position to the second stop position, the tension spring is stretched to store force.

4. A three-position dual power transfer switch according to claim 1, 2 or 3, characterized in that: The debugging slot (6) is in an inverted "Y" shape, with the opening position (61) located in the middle upper part, the main closing position (62) and the auxiliary closing position (63) located in the lower parts on both sides, and the guide block (7) moves to one side of the main closing position (62) or the auxiliary closing position (63) at the intersection of the "Y" shape to block.

5. The three-position dual power transfer switch according to claim 4, characterized in that: The guide block (7) is rotatably arranged on the bracket (1) via a rotating shaft.

6. The three-position dual power transfer switch according to claim 5, characterized in that: One end of the guide block (7) extending into the intersection of the debugging slot (6) is provided with a V-shaped guide wall (71). When the guide block (7) blocks the debugging shaft (5) from entering the main closing position (62) or the auxiliary closing position (63) on one side, the V-shaped guide wall (71) guides the debugging shaft (5) to move toward the other side.

7. The three-position dual power transfer switch according to claim 4, characterized in that: The guide block (7) is driven by a small coil (8) to movably adjust its position.

8. The three-position dual power transfer switch according to claim 7, characterized in that: The small iron core (81) of the small coil (8) is connected to a debugging piece (82), and the guide block (7) is provided with a toggle arm (72). The debugging piece (82) and the toggle arm (72) are engaged and linked.

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