A dual power supply automatic transfer switch with zero line overlap

Abstract

The utility model provides a zero line overlapping dual power automatic conversion switch, which belongs to the technical field of conversion switches, and comprises a main live line input terminal, a main zero line input terminal, a secondary live line input terminal, a secondary zero line input terminal, a live line load terminal and a zero line load terminal, a first switch is arranged between the main live line input terminal and the live line load terminal, a second switch is arranged between the main zero line input terminal and the zero line load terminal, a third switch is arranged between the secondary live line input terminal and the live line load terminal, a fourth switch is arranged between the secondary zero line input terminal and the zero line load terminal, when one of the first switch and the third switch is connected, the other is disconnected after a certain interval, and the second switch and the fourth switch have overlapping closing time; in the utility model, in the process of realizing the conversion of two circuits, the zero lines of the two circuits overlap in closing time for a certain time, so that the zero line at the load end is not disconnected.

Description

Technical Field

[0001] The utility model relates to the technical field of transfer switches, in particular to an automatic transfer switch for dual power supplies with overlapping zero lines. Background Art

[0002] The dual power automatic transfer switch, also known as the dual power switch, is mainly used to connect or disconnect the load end with the first circuit or the second circuit through motor control (motor control is the automatic mode of the dual power automatic transfer switch) or manual control (manual control is the manual mode of the dual power automatic transfer switch), that is, when the first circuit is connected, the load end is disconnected from the second circuit, and when the second circuit is connected, the load end is disconnected from the first circuit.

[0003] The patent application of the applicant with publication number CN212725042U discloses a driving device for an isolated dual power conversion switch, wherein the input ends of the main power supply and the backup power supply are three live wire access ends and one neutral wire access end, and the output ends of the main power supply and the backup power supply are combined into three live wire load ends and one neutral wire load end, which is suitable for the traditional three-phase four-wire power supply system. In this switch, the three live wire access ends and one neutral wire access end of the main power supply are connected or disconnected at the same time, and the three live wire access ends and one neutral wire access end of the auxiliary power supply are also connected or disconnected at the same time. In this way, during the switching process of the two power supplies, the neutral wire at the load end is disconnected, causing the voltage at the load end to become unstable, especially in the case of unbalanced load, which can easily cause electrical equipment to suffer damage from unstable voltage, such as overvoltage or undervoltage, which may damage the electrical equipment or shorten its service life in severe cases. Secondly, there may also be problems such as electrical casing being energized, high-precision equipment malfunctioning, and power supply quality degradation. Utility Model Content

[0004] The utility model aims to overcome the shortcomings and deficiencies of the prior art and to provide a zero line overlapping dual power automatic transfer switch.

[0005] The technical solution adopted by the utility model is as follows: a zero-line overlapping dual-power automatic conversion switch, including a main live line input terminal, a main zero line input terminal, a secondary live line input terminal, a secondary zero line input terminal, a live line load terminal and a zero line load terminal, a first switch is arranged between the main live line input terminal and the live line load terminal, a second switch is arranged between the main zero line input terminal and the zero line load terminal, a third switch is arranged between the secondary live line input terminal and the live line load terminal, a fourth switch is arranged between the secondary zero line input terminal and the zero line load terminal, when one of the first switch and the third switch is connected, the other is disconnected after a certain interval, and the second switch and the fourth switch have overlapping closing time.

[0006] Preferably, the main live wire input terminal is composed of an A-phase input terminal, a B-phase input terminal and a C-phase input terminal, the auxiliary live wire input terminal is composed of an a-phase input terminal, a b-phase input terminal and a c-phase input terminal, the live wire load terminal is composed of an A-phase output terminal, a B-phase output terminal and a C-phase output terminal, the A-phase input terminal, the B-phase input terminal and the C-phase input terminal are corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and a first switch is provided, and each of the first switches is connected or disconnected synchronously, and the a-phase input terminal, the b-phase input terminal and the c-phase input terminal are corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and a third switch is provided, and each of the third switches is connected or disconnected synchronously.

[0007] Preferably, a driving mechanism is also included, and the driving mechanism is linked with each switch, and is used to make the first switch and the fourth switch act synchronously, and the third switch and the second switch act synchronously, and the first switch and the fourth switch, one of them is disconnected and the other is closed; the third switch and the second switch, one of them is disconnected and the other is closed; the driving mechanism has a manual operation end and / or an electric operation end.

[0008] Preferably, the driving mechanism includes a main slider, a sub-slider, a driving shaft, an operating handle and a driving motor. The first switch and the fourth switch are active contacts arranged on the main slider, and the third switch and the second switch are auxiliary active contacts arranged on the sub-slider. Transmission components are arranged between the driving shaft and the main slider and the sub-slider. When the operating handle or the driving motor drives the driving shaft to rotate, the main slider and the sub-slider move in opposite directions under the transmission of the two transmission components.

[0009] Preferably, the active contact piece and the auxiliary contact piece each include two contact pieces, the two contact pieces are arranged on the corresponding slider, and the two contact pieces are arranged at intervals to form an electrical connection port, and the electrical connection port is arranged along the moving direction of the corresponding slider.

[0010] Preferably, each input terminal and each load terminal adopts a static contact piece, and the static contact piece is provided with a guide portion on one side facing the electrical connection port when the static contact piece is separated from the electrical connection port, and the guide portion is gradually contracted toward the electrical connection port. In this embodiment, the live static contact pieces and the neutral static contact pieces of each phase are arranged at equal intervals, but the electrical connection point of the neutral static contact piece is adaptively offset relative to the electrical connection point of the live static contact piece.

[0011] Preferably, a shell is further included, in which two installation cavities are arranged at intervals along the height direction, and the main slider and the auxiliary slider are respectively slidably arranged in the two installation cavities, and the installation cavities are provided with sliding limit parts in the upper and lower directions of the sliding directions of the corresponding sliders, and the two sliding limit parts are provided with ribs toward the corresponding sliders, and the ribs are arranged along the sliding direction of the corresponding sliders.

[0012] Preferably, when one of the first switch and the third switch is connected, the other is disconnected after a certain interval, and the interval time is no more than 3s.

[0013] Preferably, it also includes a shell, the transmission assembly includes a swing arm, a pull rod, a first connecting rod, a second connecting rod and a linkage shaft, the main slider and the auxiliary slider are both provided with linkage grooves, the swing arm is provided on the driving shaft and rotates synchronously with the driving shaft, one end of the pull rod is provided with a first linkage hole, and the other end is connected to the linkage shaft, the swing arm is provided with a first transmission shaft and is inserted into the first linkage hole for sliding cooperation therewith, one end of the first connecting rod is hinged to the shell, and the other end is hinged to the linkage shaft, one end of the second connecting rod is hinged to the shell, and the other end is hinged to the linkage shaft, the second connecting rod is hinged to the shell, and the other end is provided with a second linkage hole, a spring is sleeved on the second connecting rod, the linkage shaft is inserted into the second linkage hole for sliding cooperation therewith, and one end of the linkage shaft extends into the linkage groove for sliding cooperation therewith.

[0014] Preferably, the operating handle is directly connected to the drive shaft, and the drive motor is connected to the drive shaft via a transmission gear set.

[0015] The beneficial effects of the utility model are as follows: in the utility model, during the conversion process of the two circuits, the neutral lines of the two circuits overlap for a certain period of time in the closing time, so that the neutral line at the load end is not disconnected, thereby making the voltage at the load end stable, avoiding damage to electrical equipment caused by unstable voltage, and secondly, it can also reduce the problems of electrical casing being charged, high-precision equipment malfunctioning, and power supply quality degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 It is a schematic diagram of the main circuit and the auxiliary circuit in the utility model;

[0018] Figure 2 It is a partial structure diagram of the utility model Figure 1 ;

[0019] Figure 3 It is a partial schematic diagram of the utility model Figure 1 ;

[0020] Figure 4 It is a schematic diagram of the utility model;

[0021] Figure 5Schematic diagram of part of the housing of the utility model Figure 1 ;

[0022] Figure 6 Schematic diagram of part of the housing of the utility model Figure 2 ;

[0023] Figure 7 It is a cross-sectional view of the utility model;

[0024] Figure 8 It is a partial structure diagram of the utility model Figure 2 ;

[0025] Fig. 9 It is a partial schematic diagram of the utility model Figure 2 ;

[0026] Fig.10 It is a partial schematic diagram of the utility model Figure 3 . DETAILED DESCRIPTION

[0027] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0028] In the description of the present application, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "plurality" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the description of this application, it should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0031] Embodiment 1:

[0032] like Figures 1 to 10 As shown, a zero line overlapping dual power automatic transfer switch includes a main circuit and a sub-circuit. The switch can realize the conversion of two circuits. The main circuit includes a main live line input terminal 1, a main zero line input terminal 2, a main live line output terminal and a main zero line output terminal. The sub-circuit includes a sub-live line input terminal 3, a sub-zero line input terminal 4, a sub-live line output terminal and a sub-zero line output terminal. The main live line output terminal and the sub-live line output terminal are electrically connected to form a live line load terminal 5. The main zero line output terminal and the sub-zero line output terminal are electrically connected to form a zero line load terminal 6. The main live line input terminal 1 is connected to the live line load terminal 5. A first switch 7 is arranged between the load terminal 5, a second switch 8 is arranged between the main neutral line input terminal 2 and the neutral line load terminal 6, a third switch 9 is arranged between the auxiliary live line input terminal 3 and the live line load terminal 5, and a fourth switch 10 is arranged between the auxiliary neutral line input terminal 4 and the neutral line load terminal 6. When one of the first switch 7 and the third switch 9 is connected, it is closed, and the other is disconnected after a certain period of time, wherein the interval time is not greater than 3S, so that the second switch 8 and the fourth switch 10 have overlapping closing time, and the interval time is also the overlapping closing time.

[0033] In this embodiment, the first switch 7 and the fourth switch 10 act synchronously, and the third switch 9 and the second switch 8 act synchronously. The first switch 7 and the fourth switch 10, one of which is disconnected and the other is closed, and they are generally closed at the same time; the third switch 9 and the second switch 8, one of which is disconnected and the other is closed, and they are generally closed at the same time; specifically, when the first switch 7 is disconnected, the second switch 8 is not disconnected, and the fourth switch 10 will be closed at the same time, then the third switch 9 is closed and the second switch 8 is disconnected at the same time, and finally, the third switch 9 and the fourth switch 10 are both closed (and the first switch 7 and the second switch 8 are both disconnected) to form a secondary circuit path; conversely, when the third switch 9 is disconnected, the fourth switch 10 is not disconnected, and the second switch 8 is closed at the same time, then the first switch 7 is closed and the fourth switch 10 is disconnected at the same time, and finally, the first switch 7 and the second switch 8 are both closed (and the third switch 9 and the fourth switch 10 are both disconnected) to form an electrical main path.

[0034] Through the above arrangement, in the process of realizing the conversion of the two circuits, the zero lines of the two circuits overlap for a certain period of time in the closing time, so that the zero line at the load end is not disconnected, and there is charging time, so that the voltage at the load end becomes stable, avoiding the damage of electrical equipment by unstable voltage, and secondly, it can also reduce the problems of electrical casing being charged, high-precision equipment malfunctioning and power supply quality degradation.

[0035] Furthermore, the main live wire input terminal 1 is composed of an A-phase input terminal, a B-phase input terminal and a C-phase input terminal, the auxiliary live wire input terminal 3 is composed of an a-phase input terminal, a b-phase input terminal and a c-phase input terminal, the live wire load terminal 5 is composed of an A-phase output terminal, a B-phase output terminal and a C-phase output terminal, the A-phase input terminal, the B-phase input terminal and the C-phase input terminal are corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and a first switch 7 is provided, and each of the first switches 7 is connected or disconnected synchronously, and the a-phase input terminal, the b-phase input terminal and the c-phase input terminal are corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and a third switch 9 is provided, and each of the third switches 9 is connected or disconnected synchronously, which is suitable for a three-phase four-wire power supply system.

[0036] Specifically, action process one: when the main circuit disconnects phases A, B, and C, the N pole (neutral line) of the main circuit is not disconnected, and the N pole (neutral line) of the auxiliary circuit is closed; then, the a, b, and c phases of the auxiliary circuit are closed, and the N pole (neutral line) of the main circuit is disconnected; a conversion of the two circuits is realized (switching to the auxiliary circuit path). During this conversion process, the neutral lines N (neutral lines) of the two circuits overlap for a certain period of time in the closing time, and the neutral line at the load end is not disconnected.

[0037] Action process two: When the auxiliary circuit disconnects phases a, b, and c, the N pole (neutral line) of the auxiliary circuit is not disconnected, and the N pole (neutral line) of the main circuit is closed at the same time; then, the A, B, and C phases of the main circuit are closed, and the N pole (neutral line) of the auxiliary circuit is disconnected at the same time; a conversion of the two circuits is realized (switching to the main circuit path). During the conversion process, the neutral lines N (neutral lines) of the two circuits overlap for a certain period of time in the closing time, and the neutral line at the load end is not disconnected.

[0038] Furthermore, a driving mechanism is included, which is linked with each switch, and the driving mechanism has a manual operation end and / or an electric operation end. In this embodiment, it is preferred that the driving mechanism has both a manual operation end and an electric operation end, so that the operation of the driving mechanism is more flexible. In the event of failure of the automatic control system or power failure, the switch can be controlled manually, ensuring the reliability and continuity of the switch.

[0039] In order to realize the operation of the above circuit, chip control or mechanical structure can be adopted. In the present embodiment, the driving mechanism mainly realizes the switching of the two circuits through the mechanical structure, and has the function of zero line overlap. Specifically, the driving mechanism includes a main slider 11, a sub-slider 12, a driving shaft 13, an operating handle 14 and a driving motor 15. The first switch 7 and the fourth switch 10 are active contacts arranged on the main slider 11, and the third switch 9 and the second switch 8 are auxiliary contacts arranged on the sub-slider 12. In the present embodiment, the active contacts and the auxiliary contacts have the same structure. A transmission assembly is arranged between the driving shaft 13 and the main slider 11 and the sub-slider 12. When the operating handle 14 or the driving motor 15 drives the driving shaft 13 to rotate, the main slider 11 and the sub-slider 12 move in opposite directions under the transmission of the two transmission assemblies, so that the first switch 7, the second switch 8, the third switch 9 and the fourth switch 10 are synchronously operated, that is, when the driving shaft 13 rotates, the two transmission assemblies will act simultaneously.

[0040] Specifically, it also includes a shell 19, the transmission assembly includes a swing arm 24, a pull rod 25, a first connecting rod 26, a second connecting rod 27 and a linkage shaft 28, the main slider 11 and the auxiliary slider 12 are both provided with a linkage groove 29, the swing arm 24 is arranged on the drive shaft 13 and rotates synchronously with the drive shaft 13, one end of the pull rod 25 is provided with a first linkage hole 30, and the other end is connected to the linkage shaft 28, the swing arm 24 is provided with a first transmission shaft 31 and is inserted into the first linkage hole 30 to slide and cooperate with it, one end of the first connecting rod 26 is hinged to the shell 19, and the other end is hinged to the linkage shaft 28, one end of the second connecting rod 27 is hinged to the shell 19, and the other end is provided with a second linkage hole 32, the second connecting rod 27 is sleeved with a spring 271, the linkage shaft 28 is inserted into the second linkage hole 32 to slide and cooperate with it, and one end of the linkage shaft 28 extends into the linkage groove 29 to slide and cooperate with it. The first linkage hole 30 and the second linkage hole 32 are long waist-shaped holes. Regarding the driving mechanism, reference may be made to the patent application No. CN212725042U previously applied by the applicant, which discloses a driving device for an isolated dual power conversion switch.

[0041] Furthermore, the active contact piece and the auxiliary contact piece each include two contact pieces 16, the two contact pieces 16 are arranged on the corresponding slider, and the two contact pieces 16 are arranged at intervals to form an electrical connection port 17, and the electrical connection port 17 is arranged along the moving direction of the corresponding slider. Compared with one contact piece, a more stable electrical connection can be formed, and the structure is simple and the cost is low. Of course, a clip contact structure can also be adopted.

[0042] Furthermore, each input terminal and each load terminal (ie, each output terminal) adopts a static contact piece, and the static contact piece is provided with a guide portion 18 on one side facing the electrical connection port 17 when the static contact piece is separated from the electrical connection port 17, such as Figure 3 As shown, the guide portion 18 is gradually contracted toward the electrical connection port 17 , for example, the two inclined surfaces gradually contract toward the electrical connection port 17 , so as to facilitate electrical connection between the moving contact piece and the stationary contact piece.

[0043] like Figure 1 As shown, in the main circuit and the auxiliary circuit, compared with the static contact piece on the live line, the static contact piece on the neutral line is adjusted to realize the neutral line overlapping function. Specifically, the break position of the static contact piece on the neutral line is offset by a certain distance toward the live line direction.

[0044] Furthermore, two installation cavities 20 are spaced apart in the height direction in the shell 19, and the main slider 11 and the auxiliary slider 12 are respectively slidably set in the two installation cavities 20. In this embodiment, the shell 19 is assembled from a plurality of sub-shells, and a cavity is also set below the installation cavity 20 for setting the transmission component.

[0045] like Figure 5 and Figure 6 As shown, the mounting cavity 20 is provided with sliding limit portions 21 in the upper and lower parts along the sliding direction of the corresponding slider, and a protrusion is extended through the shell 19 to form a path for the corresponding slider to move. The two sliding limit portions 21 are provided with ribs 22 toward the corresponding slider, and the ribs 22 are arranged along the sliding direction of the corresponding slider to reduce the contact area between the slider and the shell 19 and improve the smoothness of the movement of the slider.

[0046] Furthermore, the outer wall of the housing 19 is provided with arc isolation grooves 23 corresponding to each input terminal and load terminal. Figure 4 As shown, a protrusion with an L-shaped cross section can be used, and an arc isolation sheet is installed in the arc isolation groove 23.

[0047] Furthermore, the operating handle 14 is directly connected to the drive shaft 13, and the drive motor 15 is connected to the drive shaft 13 through a transmission gear set 33. The transmission gear set 33 includes a meshing driving gear and a half gear. The driving gear is connected to the drive motor 15, and the half gear is connected to the drive shaft 13.

[0048] Furthermore, it also includes a plurality of micro switches, for example, those arranged corresponding to the drive shaft 13, which can provide feedback on the rotation position of the drive shaft 13; those arranged on the moving path of the main slider 11 and / or the auxiliary slider 12, which can provide feedback on the moving position of the corresponding slider, thereby improving the intelligence of the switch.

[0049] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A dual power automatic transfer switch with overlapping neutral lines, characterized in that: The invention comprises a main live line input terminal (1), a main neutral line input terminal (2), a secondary live line input terminal (3), a secondary neutral line input terminal (4), a live line load terminal (5) and a neutral line load terminal (6); a first switch (7) is arranged between the main live line input terminal (1) and the live line load terminal (5); a second switch (8) is arranged between the main neutral line input terminal (2) and the neutral line load terminal (6); a third switch (9) is arranged between the secondary live line input terminal (3) and the live line load terminal (5); a fourth switch (10) is arranged between the secondary neutral line input terminal (4) and the neutral line load terminal (6); when one of the first switch (7) and the third switch (9) is connected, the other is disconnected after a certain interval; and the second switch (8) and the fourth switch (10) have overlapping closing times.

2. The zero line overlapping dual power automatic transfer switch according to claim 1 is characterized in that: The main live line input terminal (1) is composed of an A-phase input terminal, a B-phase input terminal and a C-phase input terminal, the auxiliary live line input terminal (3) is composed of an a-phase input terminal, a b-phase input terminal and a c-phase input terminal, the live line load terminal (5) is composed of an A-phase output terminal, a B-phase output terminal and a C-phase output terminal, the A-phase input terminal, the B-phase input terminal and the C-phase input terminal are respectively provided with a first switch (7) corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and each of the first switches (7) is connected or disconnected synchronously, the a-phase input terminal, the b-phase input terminal and the c-phase input terminal are respectively provided with a third switch (9) corresponding to the A-phase output terminal, the B-phase output terminal and the C-phase output terminal, and each of the third switches (9) is respectively connected or disconnected synchronously.

3. A zero line overlapping dual power automatic transfer switch according to claim 1 or 2, characterized in that: The invention also comprises a driving mechanism, which is linked with each switch and is used to make the first switch (7) and the fourth switch (10) to operate synchronously, and the third switch (9) and the second switch (8) to operate synchronously. When the first switch (7) and the fourth switch (10) are disconnected, the other is closed; when the third switch (9) and the second switch (8) are disconnected, the other is closed. The driving mechanism has a manual operation end and / or an electric operation end.

4. The zero line overlapping dual power automatic transfer switch according to claim 3 is characterized in that: The driving mechanism comprises a main slider (11), a secondary slider (12), a driving shaft (13), an operating handle (14) and a driving motor (15); the first switch (7) and the fourth switch (10) are active contact pieces arranged on the main slider (11); the third switch (9) and the second switch (8) are secondary active contact pieces arranged on the secondary slider (12); a transmission assembly is arranged between the driving shaft (13) and the main slider (11) and the secondary slider (12); when the operating handle (14) or the driving motor (15) drives the driving shaft (13) to rotate, the main slider (11) and the secondary slider (12) move in opposite directions under the transmission of the two transmission assemblies.

5. The zero line overlapping dual power automatic transfer switch according to claim 4, characterized in that: The active contact piece and the auxiliary contact piece each include two contact pieces (16), the two contact pieces (16) are arranged on the corresponding slider, and the two contact pieces (16) are arranged at intervals to form an electrical connection port (17), and the electrical connection port (17) is arranged along the moving direction of the corresponding slider.

6. The zero line overlapping dual power automatic transfer switch according to claim 5, characterized in that: Each input terminal and each load terminal adopts a static contact piece, and when the static contact piece is separated from the electrical connection port (17), a guide portion (18) is provided on one side of the static contact piece facing the electrical connection port (17), and the guide portion (18) is gradually contracted in the direction of the electrical connection port (17).

7. The zero line overlapping dual power automatic transfer switch according to claim 4, characterized in that: The invention also comprises a shell (19), wherein two installation cavities (20) are arranged in the shell (19) at intervals along the height direction, wherein the main slider (11) and the auxiliary slider (12) are respectively slidably arranged in the two installation cavities (20), wherein the installation cavities (20) are provided with sliding limit portions (21) in the upper and lower parts along the sliding direction of the corresponding slider, wherein the two sliding limit portions (21) are provided with convex ribs (22) facing the corresponding slider, and wherein the convex ribs (22) are arranged along the sliding direction of the corresponding slider.

8. The zero line overlapping dual power automatic transfer switch according to claim 1, characterized in that: The interval time shall not exceed 3s.

9. The zero line overlapping dual power automatic transfer switch according to claim 4, characterized in that: The invention also comprises a housing (19), wherein the transmission assembly comprises a swing arm (24), a pull rod (25), a first connecting rod (26), a second connecting rod (27) and a linkage shaft (28), wherein the main slider (11) and the auxiliary slider (12) are both provided with a linkage groove (29), the swing arm (24) is provided on the drive shaft (13) and rotates synchronously with the drive shaft (13), one end of the pull rod (25) is provided with a first linkage hole (30), and the other end is connected to the linkage shaft (28), and the swing arm (24) is provided with a first The transmission shaft (31) is inserted into the first linkage hole (30) to slide and cooperate therewith; one end of the first connecting rod (26) is hinged to the housing (19) and the other end is hinged to the linkage shaft (28); one end of the second connecting rod (27) is hinged to the housing (19) and the other end is provided with a second linkage hole (32); a spring (271) is sleeved on the second connecting rod (27); the linkage shaft (28) is inserted into the second linkage hole (32) to slide and cooperate therewith; one end of the linkage shaft (28) extends into the linkage groove (29) to slide and cooperate therewith.

10. The zero line overlapping dual power automatic transfer switch according to claim 4, characterized in that: The operating handle (14) is directly connected to the drive shaft (13), and the drive motor (15) is connected to the drive shaft (13) via a transmission gear set (33).

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