A three-position dual power transfer switch

Abstract

The utility model discloses a three position double power conversion switch, design connecting rod group and the cooperation locking structure of lock catch frame, and the locking state transformation of connecting rod group and lock catch frame can be carried out through the power on and power off of a group of coils, and then realize the adjustment of the stay position of connecting rod group, thereby realize the state switching of closing and opening, compared with the mode that two groups of mechanical structures cooperate two groups of coils to operate, can greatly reduce the cost of parts and the volume occupied by mechanical structure.

Description

Technical Field

[0001] This utility model relates to the field of electrical switches, and in particular to a three-position dual-power transfer switch. Background Technology

[0002] Traditional dual-power transfer switches have two circuits: a primary circuit and a secondary circuit. An operating mechanism is connected to the input shaft. The operating mechanism uses two sets of electromagnetic coils (primary and secondary) to drive a rotating shaft, which closes and opens the two circuits. Alternatively, manual switching can be performed using a handle. The rotating shaft is connected to the output shafts of the primary and secondary circuits via a switching assembly. The output shafts connect to specific moving contacts to open and close the circuits with the stationary contacts. The electromagnetic coils are the main cost component of the dual-power transfer switch; two sets of coils not only increase the cost but also make the overall structure larger. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-position dual-power transfer switch. Through structural design, the opening and closing of the switch is achieved by a single coil, thereby reducing equipment cost and size.

[0004] This utility model adopts the following technical solution: a three-position dual-power transfer switch, including a bracket, a coil installed in the bracket, and a linkage assembly. The linkage assembly is movably configured, and the iron core of the coil is linked with the linkage assembly. When the coil is energized, it drives the extension and retraction of the iron core, thereby driving the movement of the linkage assembly. The linkage assembly includes a first swing frame and a second swing frame. Both the first and second swing frames are rotatably mounted on the bracket via a shaft structure. A drive shaft is horizontally arranged on the iron core. Both the first and second swing frames are sleeved on the drive shaft through a first oblong hole, thus forming a structural linkage. A locking bracket is also provided on the side of the bracket corresponding to the second swing frame. The locking frame is externally connected to a tension spring. The locking frame includes a second waist-shaped hole, a limiting hole, a locking wall, and an abutting wall. The second waist-shaped hole is fitted onto the first fixed axis of the bracket, thereby giving the locking frame a first degree of freedom to move back and forth along the second waist-shaped hole with the first fixed axis as the reference radial direction, and a second degree of freedom to move along the first fixed axis as the reference axial direction. The limiting hole is fitted onto the second fixed axis of the bracket, and the limiting hole has space for the second fixed axis to move in the first degree of freedom. The space includes 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 locking hooks and push plates that cooperate with the locking wall and the abutting wall.

[0005] When the second swing frame moves to the first stopping position, the push plate abuts against the contact wall and pushes the locking frame to move to the first stopping 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 locked at the end of the short space to form the stopping limit of the locking frame. The tension spring is stretched and stored. The first stopping position is the closing position of the dual power supply conversion switch.

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

[0007] When the coil is energized again to drive the iron core to move, the movement of the second swing frame causes the locking hook to disengage from the jamb. The locking frame is reset by the release of the tension spring, and when the coil is de-energized, the second swing frame resets and drives the locking frame to move to the first stopping position.

[0008] As an improvement, the second swing frame is U-shaped, with the locking hook and push plate symmetrically arranged on both sides of the second swing frame, and a set of locking frames arranged on each side of the second swing frame for cooperation.

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

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

[0011] As an improvement, the first swing frame is externally connected to an adjustment shaft. The support is provided with an adjustment slot, and the adjustment shaft is accommodated in the adjustment slot for movement. The adjustment slot includes a middle open position and main closing and auxiliary closing positions on both sides. It also includes movable guide blocks corresponding to the adjustment shaft and the adjustment slot. The guide blocks are adjusted to the main closing or auxiliary closing position of the adjustment slot to block the adjustment shaft from entering the blocking side and guide it to the other side.

[0012] As an improvement, the debugging slot is in the shape of an inverted "Y". The open position is located in the upper middle part, and the main closing position and the auxiliary closing position are located on the lower sides. The guide block moves to the side of the main closing position or the auxiliary closing position at the intersection of the "Y" shape to block it.

[0013] As an improvement, the guide block is rotatably mounted on the bracket via a pivot.

[0014] As an improvement, one 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.

[0015] As an improvement, the guide block is moved and its position is adjusted by a small coil.

[0016] As an improvement, a small iron core of a small coil is connected to a test piece, and the guide block is provided with a toggle arm. The test piece and the toggle arm are engaged and linked together.

[0017] The beneficial effects of this utility model are as follows: relying on the innovative design of the linkage group and the locking frame structure, the state switching between closing and opening can be realized when the overall structure is in motion. In this way, the movement of the structure can be driven by a set of coils. Compared with the traditional method of two sets of mechanical structures working together with two sets of coils, the cost of components and the volume occupied by the mechanical structure can be greatly reduced. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention during circuit breaker tripping. Figure 1 .

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention during circuit breaker tripping. Figure 2 .

[0020] Figure 3 This is a three-dimensional structural diagram of the hidden support when the circuit breaker is tripped.

[0021] Figure 4 This is a three-dimensional structural diagram of the present invention when the switch is closed on one side.

[0022] Figure 5 This is a three-dimensional structural diagram of the present invention after the support is hidden when the circuit is closed on one side.

[0023] Figure 6 This is a three-dimensional structural diagram of the present invention when the circuit is closed on the other side.

[0024] Figure 7 This is a three-dimensional structural diagram of the present invention after the bracket is hidden when the circuit is closed on the other side. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 , 2Figures 3, 4, 5, 6, and 7 show specific embodiments of the three-position dual-power transfer switch of this utility model. This embodiment includes a bracket 1, a coil 2 installed in the bracket 1, and a connecting rod assembly 3. The connecting rod assembly 3 is movably configured. The iron core 21 of the coil 2 is linked with the connecting rod assembly 3. When the coil 2 is energized, it drives the extension and retraction of the iron core 21, thereby driving the movement of the connecting rod assembly 3. The connecting rod assembly 3 includes a first swing frame 31 and a second swing frame 32. Both the first swing frame 31 and the second swing frame 32 are rotatably mounted on the bracket 1 via a shaft structure. A drive shaft 22 is horizontally mounted on the iron core 21. Both the first swing frame 31 and the second swing frame 32 are sleeved onto the drive shaft 22 through a first oblong hole 33, thus forming a structural linkage. A locking frame 4 is also provided on the side 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 encloses... The bracket 4 includes a second waist-shaped hole 41, a limiting hole 42, a locking wall 43, and a contact wall 44. The second waist-shaped hole 41 is fitted onto the first fixed axis 11 on the bracket 1, thereby giving the locking frame 4 a first degree of freedom to move back and forth along the second waist-shaped hole 41 with the first fixed axis 11 as the radial reference, and a second degree of freedom to move along the first fixed axis 11 as the axial reference. The limiting hole 42 is fitted onto the second fixed axis 12 on the bracket 1, and the limiting hole 42 has 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 locking hook 321 and a push plate 322 that cooperate with the locking wall 43 and the contact wall 44.

[0027] When the second swing frame 32 moves to the first stopping position, the push plate 322 abuts against the contact wall 44 and pushes the locking frame 4 to move to the first stopping 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 locked at the end of the short space 421 to form the stopping limit of the locking frame 4. The tension spring is stretched and stored. The first stopping position is the closed position of the dual power supply conversion switch.

[0028] When the coil 2 is energized and drives the iron core 21 to move, the second swing frame 32 moves to the second stopping position. During this process, the locking hook 321 abuts against the inner wall of the locking frame 4 from the inside and pushes the locking frame 4 to move in the second degree of freedom. When the locking hook 321 passes the locking frame 4 and the coil 2 is de-energized to reset the second swing frame 32, the locking hook 321 hooks onto the wall 43 and abuts against the second fixed shaft 12 to enter the long space 422. The locking frame 4 and the second swing frame 32 stop at the second stopping position. The second stopping position is the open position of the dual power supply conversion switch.

[0029] When the coil 2 is energized again to drive the iron core 21 to move, the second swing frame 32 moves to cause the locking hook 321 to disengage from the retaining wall 43. The locking frame 4 is reset by the release of the tension spring, and is reset by the second swing frame 32 when the coil 2 is de-energized, thereby driving the locking frame 4 to move to the first stopping position.

[0030] When this utility model is used, Figure 1 , 2 As shown in Figure 3, the open position of the dual power supply transfer switch is the position where the locking frame 4 and the second swing frame 32 stop at the second stopping position shown in the figure. The locking hook 321 is locked at the wall 43, the second fixed shaft 12 is located at the long space 422, and the tension spring is stretched, causing the locking frame 4 to tend to reset to the left.

[0031] When closing the circuit breaker, Figure 4 , 5 As shown in Figures 6 and 7, when coil 2 is energized, the iron core 21 descends. The drive shaft 22 descends, causing the second swing frame 32 to swing. After the locking hook 321 descends, it releases the limit on the jamming wall 43, thereby releasing the locking frame 4. The locking frame 4 moves to the left by the restoring force of the tension spring until the second fixed shaft 12 abuts against the end of the long space 422 for limitation. Afterwards, when coil 2 is de-energized, the iron core 21 can be reset upward by the elastic element sleeved on it, thereby causing the second swing frame 32 and the first swing frame 31 to move to the first stopping position, which is the closing position. During this movement, the first swing frame 31 drives the debugging shaft 5 from the opening position 61 of the debugging slot 6 to the main closing position. Position 62 or secondary closing position 63, thus completing the action; the second swing frame 32 swings back, and since the locking frame 4 has moved to the left, it will not interfere with the locking hook 321. During the continuous swinging of the second swing frame 32, the push plate 322 on the other side pushes the locking frame 4 to the right again after contacting the abutting wall 44 of the locking frame 4, thereby causing the second fixed shaft 12 to move to the left along the long space 422 until it reaches the right end of the short space 421. The locking frame 4 will rotate, causing the second fixed shaft 12 to fall into the short space 421 and abut against the right end to form the structural limit of the locking frame 4. During this process, the tension spring is stretched and stored, and the locking frame 4 and the second swing frame 32 stop at the first stopping position.

[0032] When the circuit breaker is tripped, coil 2 is energized, causing iron core 21 to descend. Lock hook 321 swings downwards with the second swing frame 32, pushing outwards to open locking bracket 4. After lock hook 321 passes locking bracket 4, coil 2 is de-energized, iron core 21 returns to its upward position, and the second swing frame 32, upon returning to its upward position, contacts locking bracket 4. The upward movement of locking bracket 4 causes the second fixed shaft 12 to disengage from short space 421 and enter long space 422. Lock hook 321 hooks onto the retaining wall 43, thus limiting locking bracket 4 and preventing it from moving to the left. The first swing frame 31 moves to the second stopping position, and the adjusting shaft 5 returns to the tripped position 61.

[0033] The above actions are achieved by a set of coils 2 and iron core 21. Compared with the traditional method of using two sets of mechanical structures in conjunction with two sets of coils to complete the switching of two circuits, this method can greatly reduce component costs and the volume occupied by the mechanical structure.

[0034] As an improved specific implementation, the second swing frame 32 is U-shaped in general, with the locking hook 321 and the push plate 322 symmetrically arranged on both sides of the second swing frame 32, and a set of locking frames 4 are respectively arranged on both sides of the second swing frame 32 for cooperation.

[0035] like Figure 1 , 2 As shown in Figure 3, the U-shaped second swing frame 32, in conjunction with the locking frames 4 on both sides, locks the components on both sides, ensuring that the force on the components is uniform and stable, and preventing failures caused by local or unilateral wear of the transmission structure during long-term use.

[0036] As an improved specific implementation, the inner side of the locking frame 4 is provided with an arc-shaped inner wall 45 that contacts and cooperates with the locking hook 321.

[0037] like Figure 3 , 5 As shown in Figure 7, the arc-shaped inner wall 45 corresponds to the position where the locking hook 321 abuts, providing a gentler abutting arc surface. The corresponding abutting surface of the locking hook 321 is also set as an arc surface, reducing hard collision wear when the locking hook 321 moves downward to open the locking bracket 4, thus extending the service life of the component.

[0038] As an improved specific implementation, the second swing frame 32 is externally connected to a tension spring, which is stretched to store force when the second swing frame 32 moves from the first stopping position to the second stopping position.

[0039] like Figure 1 As shown, a tension spring is used to provide restoring force to the second swing frame 32. When the second swing frame 32 is driven to swing by the coil 2, the tension spring is stretched. After the coil 2 is de-energized, the restoring force of the tension spring can be used to quickly reset the second swing frame 32 to the first stopping position, thereby ensuring the stability of the closing position and driving the locking frame 4 to move to the first stopping position.

[0040] As an improved specific implementation, the first swing frame 31 is externally connected to the adjustment shaft 5, and the support 1 is provided with an adjustment slot 6. The adjustment shaft 5 is accommodated in the adjustment slot 6 and moves within it. The adjustment slot 6 includes a middle open position 61 and a main closing position 62 and an auxiliary closing position 63 on both sides. It also includes a movable guide block 7 corresponding to the adjustment shaft 5 and the adjustment slot 6. The guide block 7 can be moved to the main closing position 62 or the auxiliary closing position 63 of the adjustment slot 6 to block the adjustment shaft 5 from entering the blocking side and guide it to the other side.

[0041] like Figure 1-7 As shown, during opening, the test shaft 5 moves from the main closing position 62 or the auxiliary closing position 63 of the test slot 6 to the opening position 61. During closing, the test shaft 5 moves from the opening position 61 of the test slot 6 to the main closing position 62 or the auxiliary closing position 63. The guide block 7 blocks the test shaft 5 at the main closing position 62 or the auxiliary closing position 63, thus allowing the test shaft 5 to move to the other side, either the auxiliary closing position 63 or the main closing position 62. When switching between the normal and standby switches is required, the position of the guide block 7 is adjusted. After adjustment, the guide block 7 can move to the unblocked side. Figure 1-5 For example, guide block 7 blocks the auxiliary closing position 63. If closing is performed at this time, the debugging shaft 5 will move towards the main closing position 62, and then... Figure 4 , 5 The circuit is closed as shown; if guide block 7 blocks the main closing position 62, then the adjustment shaft 5 will move to the auxiliary closing position 63, and so on. Figure 6 , 7 The diagram shows the backup circuit being closed. The power output mechanism corresponding to the test shaft 5 is connected to an external swing arm 9. When the test shaft 5 is 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 connected to an external moving contact. The left or right rotation causes the moving contact to make contact with the corresponding normal side stationary contact or the backup side stationary contact to complete the closing. By adjusting the movement trajectory of the test shaft 5 through the guide block 7, the switching between the two circuits can be realized, which can greatly simplify the power input and output mechanism, greatly simplify the component structure, and reduce the volume occupied by the mechanism while controlling costs.

[0042] As an improved specific implementation, the debugging slot 6 is in the shape of an inverted "Y". The open position 61 is located in the middle upper part, and the main closing position 62 and the auxiliary closing position 63 are located on both sides of the lower part. The guide block 7 moves to the side of the main closing position 62 or the auxiliary closing position 63 at the intersection of the "Y" shape to block.

[0043] like Figure 1 , 2 As shown in Figures 4 and 6, the specific debugging slot 6 forms a middle upper part with a tripped position 61, and two lower parts with main closing positions 62 and auxiliary closing positions 63. The main closing positions 62 and auxiliary closing positions 63 are symmetrically arranged. When the debugging shaft 5 falls and is guided by the guide block 7 to a closing position on one side, the position of the debugging shaft 5 can be kept stable. When the debugging shaft 5 moves to the tripped 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.

[0044] As an improved specific implementation, the guide block 7 is rotatably mounted on the bracket 1 via a pivot.

[0045] like Figure 1-7 As shown, the rotating shaft is positioned slightly below the central axis of the debugging slot 6, allowing the guide block 7 to swing left and right to adjust its position during rotation, thus completing the switching operation at the intersection of the debugging slot 6.

[0046] As an improved specific implementation, one end of the guide block 7 that extends into the intersection 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.

[0047] like Figure 1-5 As shown, when the "V"-shaped guide wall 31 is located at the main closing position 62 or the auxiliary closing position 63, it can effectively block the entry of the debugging shaft 5 by relying on one side of the inclined surface, and the inclined surface and the groove wall on the other side form a continuous guide surface, which can guide the debugging shaft 5 to move smoothly to the other side to complete the closing.

[0048] As an improved specific implementation, the guide block 7 is driven by a small coil 8 to adjust its position.

[0049] like Figure 3 , 5 As shown in Figure 7, preferably, the position of the guide block 7 can be adjusted by setting a small coil 8, and then the circuit of the dual power supply transfer switch can be used to automatically switch the normal side and the standby side circuit. The size of the small coil 8 is relative to the coil 2 that controls the opening and closing of the circuit breaker. Since there are many components to be driven, such as the input components, such as the linkage group 3, the adjustment shaft 5, and the output components, such as the swing arm 9, the output shaft 91, and the moving contact, a larger coil 2 is used for electromagnetic drive to open and close the circuit breaker. The guide block 7 itself does not have any extra linkage components, so the smaller and more cost-effective small coil 8 can be used. Compared with the traditional structure, it also has better cost and volume advantages.

[0050] As an improved specific implementation, the small iron core 81 of the small coil 8 is connected to a test piece 82, and the guide block 7 is provided with a toggle arm 72. The test piece 82 and the toggle arm 72 are engaged and linked together.

[0051] like Figure 1-7As shown, the adjustment piece 82 and the toggle arm 72, through their structural cooperation, cause the small iron core 81 to move up or down when the small coil 8 is energized or de-energized. This, in turn, drives the adjustment piece 82 to adjust the up-down movement of the toggle arm 72, thereby achieving the left-right position adjustment of the guide block 7. Preferably, the adjustment piece 82 or the toggle arm 72 can also be extended beyond the bracket 1, making it convenient for operators to use tools to move the adjustment piece 82 or the toggle arm 72, thereby performing manual switching of the main and auxiliary circuits.

[0052] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A three-position dual-power transfer switch, comprising a bracket (1), a coil (2) mounted in the bracket (1), and a linkage group (3), wherein the linkage group (3) is movably configured, and the iron core (21) of the coil (2) is linked with the linkage group (3), driving the extension and retraction of the iron core (21) when the coil (2) is energized, thereby driving the movement of the linkage group (3); characterized in that: The linkage assembly (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 rotatably mounted on the bracket (1) via a shaft structure. The iron core (21) is horizontally mounted with a drive shaft (22). The first swing frame (31) and the second swing frame (32) are both sleeved on the drive shaft (22) through a first waist-shaped hole (33) to form a linkage structure. A locking frame (4) is also provided on the side 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 retaining wall (43), and an abutting wall (44). The second waist-shaped hole (41) is sleeved on the second swing frame (32). At the first fixed axis (11) on the bracket (1), the locking frame (4) is made to have a first degree of freedom to move back and forth along the second waist-shaped hole (41) with the first fixed axis (11) as the radial reference, and a second degree of freedom to move along the first fixed axis (11) as the axial reference. 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 locking hook (321) and a push plate (322) that cooperate with the card wall (43) and the abutment wall (44). When the second swing frame (32) moves to the first stopping position, the push plate (322) abuts against the contact wall (44) and pushes the locking frame (4) to move to the first stopping 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 locked at the end of the short space (421) to form the stopping limit of the locking frame (4). The tension spring is stretched and stored. The first stopping position is the closing position of the dual power supply conversion switch. When the coil (2) is energized and drives the iron core (21) to move, the second swing frame (32) moves to the second stopping position. During this process, the locking hook (321) abuts against the inner wall of the locking frame (4) from the inside and pushes the locking frame (4) to move on the second degree of freedom. When the locking hook (321) passes the locking frame (4) and the coil (2) is de-energized to reset the second swing frame (32), the locking hook (321) hooks onto the wall (43) and abuts against the second fixed shaft (12) to enter the long space (422). The locking frame (4) and the second swing frame (32) stop at the second stopping position. The second stopping position is the open position of the dual power supply conversion switch. When the coil (2) is energized again to drive the iron core (21) to move, the second swing frame (32) moves to make the locking hook (321) disengage from the wall (43), the locking frame (4) is reset by the release of the tension spring, and is reset by the second swing frame (32) when the coil (2) is de-energized, thereby driving the locking frame (4) to move to the first stop position.

2. A three-position dual-power transfer switch according to claim 1, characterized in that: The second swing frame (32) is U-shaped in general. The locking hook (321) and the push plate (322) are symmetrically arranged on both sides of the second swing frame (32). The locking frame (4) is arranged on both sides of the second swing frame (32) for cooperation.

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

4. A three-position dual-power transfer switch according to claim 1, 2, or 3, characterized in that: The second swing frame (32) is connected to a tension spring. 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.

5. A three-position dual-power transfer switch according to claim 1, characterized in that: The first swing frame (31) is connected to an external adjustment shaft (5). The support (1) is provided with an adjustment slot (6). The adjustment shaft (5) is accommodated in the adjustment slot (6) and moves within it. The adjustment slot (6) includes a middle open position (61) and a main closing position (62) and a secondary closing position (63) on both sides. It also includes movable guide blocks (7) corresponding to the adjustment shaft (5) and the adjustment slot (6). The guide blocks (7) are adjusted to the main closing position (62) or the secondary closing position (63) of the adjustment slot (6) to block the adjustment shaft (5) from entering one side and guide it to the other side.

6. A three-position dual-power transfer switch according to claim 5, characterized in that: The debugging slot (6) is in the shape of an inverted "Y". The opening position (61) is located in the upper middle part, and the main closing position (62) and the auxiliary closing position (63) are located on the lower sides. The guide block (7) moves to the side of the main closing position (62) or the auxiliary closing position (63) at the intersection of the "Y" shape to block.

7. A three-position dual-power transfer switch according to claim 6, characterized in that: The guide block (7) is rotatably mounted on the bracket (1) via a rotating shaft.

8. A three-position dual-power transfer switch according to claim 7, characterized in that: The end of the guide block (7) that extends into the intersection 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.

9. A three-position dual-power transfer switch according to any one of claims 5-8, characterized in that: The guide block (7) is driven by a small coil (8) to adjust its position.

10. A three-position dual-power transfer switch according to claim 9, characterized in that: The small iron core (81) of the small coil (8) is connected to a test piece (82), and the guide block (7) is provided with a toggle arm (72). The test piece (82) and the toggle arm (72) are engaged and linked together.

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