AC / DC dual power supply switching device

Abstract

The present application relates to AC-DC current switching field, it discloses a kind of AC-DC dual power switching device, including AC power supply and DC power supply, AC power supply includes motor and generator, it is connected between the connection module, the output shaft of generator is provided with energy storage flywheel, brake is provided on mounting bracket, when normal use, motor drives generator to operate by connection module, AC power generated by generator is powered to subway equipment, when AC power supply normal interruption power supply, brake simultaneously stops energy storage flywheel, DC power supply includes battery, AC power supply and DC power supply are in parallel relationship, switch module includes switch one and switch two respectively in series in two parallel branches, when AC power supply abnormal power failure, brake is not started, connection module is driven by the speed difference between motor and generator, cooperate with switch module, realize the automatic live switching between AC power supply and DC power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of AC / DC power supply switching, in particular to an AC / DC dual power supply switching device. BACKGROUND

[0002] In a subway power supply system, an AC / DC power supply device is an important device for ensuring the normal operation of a substation equipment, and is of great significance to the normal operation of a subway system. The AC / DC power supply device includes an AC power supply and a DC operating power supply. The former directly provides AC power to the equipment, and the latter uses a storage battery as a backup power supply. The existing technology converts DC power into AC power through an inverter to supply power to the equipment. When the AC power supply is interrupted, the DC power supply can supply power and ensure the work after the interruption. In the prior art, the switching between the AC power supply and the DC power supply is generally power-off switching. When the AC power supply is interrupted, the staff manually or the control system automatically drives the switch to switch to the DC power supply. During this period, the equipment will be temporarily stopped. The stop and start of the equipment have a distinct feature, which can be easily perceived by passengers on the subway and can easily cause panic among the passengers. Therefore, as a public transportation device, it is necessary to improve the AC / DC power supply device to realize automatic triggering and live switching. The switching process is smooth and not easy to be perceived by passengers. Based on this, the present application provides an AC / DC dual power supply switching device. SUMMARY

[0003] To solve the problems mentioned in the background, the present application provides an AC / DC dual power supply switching device.

[0004] To achieve the above technical purposes, the technical scheme adopted by the present application is as follows.

[0005] An AC / DC dual power supply switching device includes an AC power supply, a DC power supply, and a mounting rack. A connection module and a switch module are installed on the mounting rack.

[0006] The AC power supply includes a motor and a generator connected through the connection module. An energy storage flywheel is arranged on the output shaft of the generator. A brake is arranged on the mounting rack. In normal use, the motor drives the generator to operate through the connection module. The AC power generated by the generator supplies power to the subway equipment. When the AC power supply is normally interrupted, the brake simultaneously stops the energy storage flywheel.

[0007] The DC power supply includes a storage battery. The AC power supply and the DC power supply are in parallel relationship. The switch module includes switch one and switch two arranged in series on two parallel branches, respectively. When the AC power supply is abnormally interrupted, the brake is not started. The connection module is driven by the speed difference between the motor and the generator, and cooperates with the switch module to realize automatic live switching between the AC power supply and the DC power supply.

[0008] As a further improvement and optimization of the present application, the switch module comprises side contact rods slidingly installed on the mounting frame, the outer part of the side contact rods is provided with external steps, the side contact rods are provided with two and are respectively side contact rod one and side contact rod two, the outer part of the side contact rod one is sleeved with spring one between the external steps and the mounting frame, the outer part of the side contact rod two is sleeved with spring two between the external steps and the mounting frame, the spring one and the spring two are insulated and the elastic force of both is used to drive the corresponding side contact rod to approach the other side contact rod.

[0009] The middle support is provided between the two side contact rods, the left contact rod and the right contact rod are respectively provided on the two sides of the middle support, the left contact rod can be in contact with the side contact rod one and both constitute switch one corresponding to the alternating current power supply, the right contact rod can be in contact with the side contact rod two and both constitute switch two corresponding to the direct current power supply.

[0010] As a further improvement and optimization of the present application, when the middle support is at the middle position between the two side contact rods, the switch one and the switch two are both closed.

[0011] As a further improvement and optimization of the present application, the connection module comprises connecting shaft one and connecting shaft two installed on the mounting frame through bearings and parallel to the sliding direction of the side contact rods, and both are coaxial;

[0012] The input end of the connecting shaft one is connected with the motor, the output end is coaxially installed with a cover, the input end of the connecting shaft two coaxially extends into the cover and is installed with a rotating disc, and the output end is connected with the generator.

[0013] As a further improvement and optimization of the present application, the cover is a cylindrical shell shape with one end open and provided with a cover, and one end closed, the cover is connected with the connecting shaft one.

[0014] As a further improvement and optimization of the present application, the outer circular surface of the cover is radially provided with a sliding hole, a sliding rod is slidingly installed in the sliding hole, the outer circular surface of the rotating disc is provided with a convex and a groove and an arc surface between them, the rotational direction of the cover when the motor operates is rotational direction one, the convex is in front of the groove along the rotational direction one, initially, the sliding rod is between the convex and the groove, and the sliding rod is in contact with the convex.

[0015] As a further improvement and optimization of the present application, the end of the sliding rod towards the axis of the cover is installed with a roller, the roller is in contact with the arc surface.

[0016] As a further improvement and optimization of the present application, the closed end of the cover extends a guide rod, a push frame is slidingly connected on the guide rod, a limiting ring is provided at the end of the guide rod, a spring three is sleeved on the outer part of the guide rod between the limiting ring and the push frame.

[0017] The push frame is provided with an inclined surface one, and the end of the slide bar away from the axis of the cover is provided with an inclined surface two, the inclined surface one and the inclined surface two are attached, when the slide bar moves away from the axis of the cover, the movement of the push frame away from the connecting shaft one is driven by the cooperation of the inclined surface one and the inclined surface two, the push frame is connected with the middle support, and the switch one is located on the side of the middle support facing the connecting shaft one.

[0018] As a further improvement and optimization of the application, the connecting part between the groove and the curved surface is chamfered.

[0019] The working process of the application:

[0020] During normal use, the switch one corresponding to the alternating current source is closed, and the switch two corresponding to the direct current is opened, therefore, the alternating current provided by the alternating current source can be sent to the subway equipment, and the power supply process of the alternating current source: at the beginning, the motor is driven to rotate the connecting shaft one, the connecting shaft one rotates with the cover, and the rotation of the cover is clockwise, therefore, when the cover rotates, the slide bar pushes the convex to rotate the rotating disc, and the rotating disc rotates with the connecting shaft two, thereby driving the generator to generate electricity, and the generated electricity is sent to the subway equipment. Figure 7

[0021] When the subway equipment is normally suspended and needs to be temporarily interrupted, the motor is suspended, and at the same time, the energy storage flywheel is stopped by the brake, that is, the motor and the generator are simultaneously suspended, and the power supply is suspended.

[0022] When the alternating current appears a problem, the motor stops rotating, and the output shaft of the generator continues to rotate under the driving of the energy storage flywheel, therefore, a speed difference exists between the connecting shaft one and the connecting shaft two, for example, the rotating disc rotates clockwise, and the cover is stationary, at this time, the curved surface of the rotating disc can drive the slide bar to move away from the axis of the cover, when the slide bar moves, the push frame moves by the inclined surface one and the inclined surface two, the push frame moves with the middle support, thereby making the switch module experience stages one, two and three in turn. Figure 7

[0023] Stage one, the switch one is closed, and the switch two is opened, due to the existence of the energy storage flywheel, the generator can still generate electricity, and provide power to the subway equipment;

[0024] Stage two, the movement of the middle support makes the switch one and the switch two both closed, at this time, the generator and the battery of the direct current together supply power to the subway equipment;

[0025] ​​Phase three, the movement of the middle support makes switch one open and switch two close, at this time, the generator stops rotating and stops power supply, and changes to battery power supply, by then, the AC power supply and the DC power supply complete switching, and it is automatic live switching, when the switching is completed, the roller on the slide rod is located in the groove, forming a plug-in, so it will limit the rotating disc to continue rotating, that is, limit the generator to run, at the same time, due to the elastic force of spring three, the slide rod will finally have a movement trend of approaching the axis of the shell along the radial direction, so spring three is compressed at this time and cannot release the elastic force;

[0026] When the problem of the AC power supply is solved, the motor starts, the shell rotates with the slide rod first, the fillet between the groove and the curved surface can make the slide rod leave the groove and re-contact the protrusion, in this process, spring three releases the elastic force, so that the switch module has the reverse action of the above-mentioned phases one, two and three, thereby realizing the switching of the linear power supply to the AC power supply, and the generator operation to provide power to the subway equipment.

[0027] Compared with the prior art, the present application has the beneficial effects that:

[0028] The present application can realize smooth live switching between the AC power supply and the DC power supply, on this basis: on the one hand, the power supply and power off of the AC power supply corresponding to the start and stop of the subway equipment are not affected, that is, the normal use of AC power is not affected, on the other hand, when the AC power supply has a problem, the automatic live switching of the AC power supply to the standby DC power supply can be realized, and the subway equipment still operates normally during the switching transition, so the subway equipment has no obvious corresponding features and is not easy to be perceived by passengers, as a public transportation equipment, it is not easy to cause passenger panic;

[0029] When the problem of the AC power supply is solved, the AC power supply directly supplies power, that is, the DC power supply automatically switches to the AC power supply for power supply. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present application;

[0031] Figure 2 It is a schematic diagram of the mounting frame, the connection module and the switch module;

[0032] Figure 3 It is a top view of the connection module and the switch module at phase one;

[0033] Figure 4 It is a top view of the connection module and the switch module at phase two;

[0034] Figure 5 It is a top view of the connection module and the switch module at phase three;

[0035] Figure 6Fig. 2 is a schematic view of the connection module and the switch module;

[0036] Figure 7 Fig. 3 is a partial schematic view of the connection module Figure 1 ;

[0037] Figure 8 Fig. 4 is a partial schematic view of the connection module Figure 2 ;

[0038] Figure 9 Fig. 5 is a partial schematic view of the connection module Figure 3 ;

[0039] Figure 10 Fig. 6 is a side view of the rotating disc, the slide rod and the push frame.

[0040] Reference signs in the drawings are as follows:

[0041] 100, motor; 101, generator; 102, energy storage flywheel; 103, brake; 104, battery; 105, voltage stabilizer; 106, inverter; 107, control system; 200, connection module; 201, connecting shaft I; 202, connecting shaft II; 203, cover; 204, cover cap; 205, rotating disc; 2051, protrusion; 2052, groove; 206, slide rod; 207, push frame; 208, spring III; 300, switch module; 301, middle support; 302, left touch rod; 303, right touch rod; 304, side touch rod I; 305, spring I; 306, side touch rod II; 307, spring II. DETAILED DESCRIPTION

[0042] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0043] Referring to Figures 1-10 The AC-DC dual power switching device comprises an AC power source and a DC power source.

[0044] The AC power source comprises a motor 100 and a generator 101, which are connected through a connection module 200. In addition, an energy storage flywheel 102 is arranged on the output shaft of the generator 101. In normal use, the motor 100 drives the generator 101 to operate through the connection module 200. The power generated by the generator 101 is used as the AC power source to supply power to the subway equipment. Further, the power output by the generator 101 is stabilized by a voltage stabilizer 105 and then sent to the subway equipment through a control system 107. The voltage stabilizer 105 and the control system 107 are both prior art and will not be described in detail.

[0045] The direct current power supply includes a battery 104, and the direct current power provided by the battery 104 can be converted by an inverter 106 and then sent to the subway equipment through a control system 107.

[0046] The alternating current power supply and the direct current power supply are in parallel connection, a switch module 300 for switching between the two includes a switch one and a switch two arranged in series on the two parallel branches respectively, in addition, the inverter 106 is arranged on the parallel branch where the direct current power supply is located, the voltage stabilizer 105 is arranged on the parallel branch where the alternating current power supply is located, and the control system 107 is arranged on the parallel main line.

[0047] The switch module 300 includes:

[0048] With reference to Figures 2-5 The scheme also includes a mounting rack for mounting the connection module 200 and the switch module 300.

[0049] The switch module 300 includes side contact rods slidingly mounted on the mounting rack, the side contact rods are externally provided with external steps, the side contact rods are externally sleeved with springs located between the external steps and the mounting rack, the side contact rods are provided with two and are respectively a side contact rod one 304 and a side contact rod two 306, the side contact rod one 304 is provided with a spring one 305, and the side contact rod two 306 is provided with a spring two 307, the elastic force of the springs is used to drive the two side contact rods to move close to each other, in addition, the springs are made of insulating material or externally provided with an insulating layer.

[0050] A middle support 301 is arranged between the two side contact rods, the middle support 301 is provided with a left contact rod 302 and a right contact rod 303 on the two sides respectively, the left contact rod 302 can be in contact with the side contact rod one 304, and the two constitute a switch one corresponding to the alternating current power supply, and the right contact rod 303 can be in contact with the side contact rod two 306, and the two constitute a switch two corresponding to the direct current power supply.

[0051] In addition, it should be noted that when the middle support 301 is at the middle position between the two side contact rods, the switch one and the switch two are both closed, that is, the left contact rod 302 is in contact with the side contact rod one 304, and the right contact rod 303 is in contact with the side contact rod two 306, then the middle support 301 continues to move towards which side, the switch on which side remains closed, and the corresponding spring is compressed, and the switch on the other side is opened.

[0052] With reference to Figure 1 A brake 103 is arranged on the mounting rack, which is used to brake the energy storage flywheel 102 to stop rotating, which is a prior art brake technology, and the automobile brake technology can be used, and details are not described herein.

[0053] In normal use, the middle support 301 is closer to the side touch rod 1 304, the switch 1 corresponding to the alternating current power supply is closed, and the switch 2 corresponding to the direct current is opened, so that the alternating current provided by the alternating current power supply can be supplied to the subway equipment. When the subway equipment is normally suspended and needs to be temporarily interrupted, the motor 100 is suspended, at the same time, the energy storage flywheel 102 is stopped by the brake 103, that is, the motor 100 and the generator 101 are suspended at the same time, and the power supply is suspended;

[0054] When the alternating current appears a problem, the motor 100 stops rotating, the output shaft of the generator 101 continues to rotate under the driving of the energy storage flywheel 102, that is, there is a speed difference between the motor 100 and the generator 101, the state switching of the connection module 200 is driven by the speed difference, and the middle support 301 is driven to move by the connection module 200. The movement is divided into three stages:

[0055] In the first stage, the switch 1 is closed and the switch 2 is opened. Because of the existence of the energy storage flywheel 102, the generator 101 can still generate electricity and provide power to the subway equipment;

[0056] In the second stage, the movement of the middle support 301 makes the switches 1 and 2 closed. At this time, the generator 101 supplies power to the subway equipment together with the direct current battery 104;

[0057] In the third stage, the movement of the middle support 301 makes the switch 1 open and the switch 2 closed. At this time, the generator 101 stops rotating and stops supplying power, and the battery 104 supplies power instead. Thus, the alternating current power supply and the direct current power supply complete the switching, and the switching is charged and smooth.

[0058] Connection module 200:

[0059] Referring to Figures 6-10 , the connection module 200 includes a connecting shaft 1 201 and a connecting shaft 2 202 installed on the mounting frame through bearings and parallel to the sliding direction of the side touch rod, and coaxial.

[0060] The input end of the connecting shaft 1 201 is connected with the motor 100, and the output end is coaxially installed with a cover 203. Further, the cover 203 is in the shape of a cylindrical shell with one end open and the other end closed. The open end is provided with a cover 204, and the cover 204 is connected with the connecting shaft 1 201.

[0061] The input end of the connecting shaft 2 202 coaxially extends into the cover 203 and is installed with a rotating disc 205, and the output end is connected with the generator 101.

[0062] The outer circumferential surface of the cover 203 is radially provided with a sliding hole, a sliding rod 206 is slidingly installed in the sliding hole, the outer circumferential surface of the rotating disc 205 is provided with a protrusion 2051, a recess 2052 and an arc surface between the protrusion 2051 and the recess 2052, the rotation direction of the cover 203 driven by the operation of the motor 100 is rotation direction one, the protrusion 2051 is located in front of the recess 2052 along the rotation direction one, initially, the sliding rod 206 is located between the protrusion 2051 and the recess 2052, and the sliding rod 206 is in contact with the protrusion 2051; at the beginning, taking the viewing angle in the formula as an example, the motor 100 drives the rotation of the connecting shaft one 201, the connecting shaft one 201 rotates with the cover 203, the rotation of the cover 203 is clockwise, that is, the rotation direction one is clockwise, therefore, when the cover 203 rotates, the rotating disc 205 is rotated together by the sliding rod 206 pushing the protrusion 2051, the rotating disc 205 rotates with the connecting shaft two 202, thereby driving the generator 101 to generate electricity. Figure 7

[0063] The closed end of the cover 203 extends a guide rod, a push frame 207 is slidingly connected to the guide rod, the push frame 207 is provided with an inclined surface one, an end of the sliding rod 206 away from the axis of the cover 203 is provided with an inclined surface two, the inclined surface one and the inclined surface two are in contact, when the sliding rod 206 moves away from the axis of the cover 203, through the cooperation of the inclined surface one and the inclined surface two, the push frame 207 can be pushed to move away from the connecting shaft one 201, the push frame 207 is connected with the middle support 301 and can move with the middle support 301, in addition, the switch one is located on the side of the middle support 301 facing the connecting shaft one 201, in addition, the end of the guide rod is provided with a limiting ring, the outside of the guide rod is provided with a spring three 208 between the limiting ring and the push frame 207.

[0064] When the motor 100 stops running due to problems with alternating current, the generator 101 can still rotate for a period of time under the tendency of the energy storage flywheel 102, therefore, a speed difference between the connecting shaft one 201 and the connecting shaft two 202 will be caused, so that the switch one is separated from the connecting shaft one 201, and the switch one is connected with the connecting shaft two 202, thereby achieving the purpose of switching the power supply of the motor 100. Figure 7 ​The perspective of the rotating disc 205 is taken as an example, which is equivalent to the rotating disc 205 rotating clockwise, and the shell 203 is stationary. At this time, the arc surface of the rotating disc 205 can drive the slide rod 206 to move away from the axis of the shell 203. Preferably, in order to reduce the friction between the two, the end of the slide rod 206 towards the axis of the shell 203 is provided with a roller, which reduces the friction by contacting the arc surface. When the slide rod 206 moves, the inclined surface one and the inclined surface two drive the push frame 207 to move, and the push frame 207 moves together with the middle support 301, so that the switch module 300 sequentially experiences the stages one, two and three mentioned above, and realizes the smooth switching of the alternating current power supply to the direct current power supply. It should be noted that when the roller on the slide rod 206 is located in the groove 2052, the groove 2052 and the slide rod 206 form a plug connection, and the switching has been completed at this time, so the rotation of the rotating disc 205 is limited, that is, the operation of the generator 101 is limited. At the same time, due to the elastic force of the spring three 208, the slide rod 206 has a movement trend of approaching the axis of the shell 203 along the radial direction, so the spring three 208 is compressed at this time and cannot release the elastic force;

[0065] When the problem of the alternating current power supply is solved, the motor 100 starts, and the shell 203 rotates with the slide rod 206. The transition fillet between the groove 2052 and the arc surface can make the slide rod 206 leave the groove 2052 and re-contact the convex 2051. During this process, the spring three 208 releases the elastic force, so that the switch module 300 performs reverse actions of the stages one, two and three mentioned above, thereby realizing the switching of the direct current power supply to the alternating current power supply, and the generator 101 operates to provide power to the subway equipment.

[0066] From the above:

[0067] The scheme can realize smooth and smooth switching between the alternating current power supply and the direct current power supply. On this basis: on the one hand, when the subway equipment is normally used, the power supply and power-off of the alternating current power supply corresponding to the start and stop of the subway equipment are not affected, that is, the normal use of the alternating current is not affected. On the other hand, when the alternating current has a problem, the automatic switching of the alternating current to the standby direct current power supply can be realized, and the subway equipment still operates normally during the switching transition. Therefore, the subway equipment has no obvious corresponding features and is not easy to be perceived by passengers. As a public transportation equipment, it is not easy to cause panic of passengers;

[0068] When the problem of the alternating current is solved, the alternating current directly supplies power, that is, the direct current power supply is automatically switched to the alternating current power supply.

[0069] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An AC / DC dual power switching device, comprising an AC power supply and a DC power supply, characterized in that: It also includes a mounting frame, on which a connection module (200) and a switch module (300) are mounted; The AC power supply includes an electric motor (100) and a generator (101), and the two are connected via a connecting module (200). An energy storage flywheel (102) is provided on the output shaft of the generator (101), and a brake (103) is provided on the mounting frame. During normal use, the electric motor (100) drives the generator (101) to operate via the connecting module (200), and the AC power generated by the generator (101) is used to power subway equipment. When the AC power supply is normally interrupted, the brake (103) simultaneously stops the energy storage flywheel (102). The DC power supply includes a battery (104), the AC power supply and the DC power supply are connected in parallel, and the switch module (300) includes a switch 1 and a switch 2 respectively connected in series on two parallel branches. When the AC power supply is abnormally cut off, the brake (103) is not activated, and the connection module (200) is driven by the speed difference between the motor (100) and the generator (101) to cooperate with the switch module (300) to realize automatic live switching between the AC power supply and the DC power supply. The switch module (300) includes two side contact rods, namely a first side contact rod (304) and a second side contact rod (306); A middle bracket (301) is provided between the two side contact rods, and a left contact rod (302) and a right contact rod (303) are provided on both sides of the middle bracket (301). The left contact rod (302) can come into contact with the first side contact rod (304), and the two constitute a switch 1 corresponding to the AC power supply. The right contact rod (303) can come into contact with the second side contact rod (306), and the two constitute a switch 2 corresponding to the DC power supply. When the middle bracket (301) is at a middle position between the two side contact rods, both switch 1 and switch 2 are closed; The connecting module (200) includes a first connecting shaft (201) and a second connecting shaft (202), and the two connecting shafts are coaxial; The input end of the first connecting shaft (201) is connected to the motor (100), and the output end is coaxially installed with a cover (203); the input end of the second connecting shaft (202) coaxially extends into the cover (203) and is installed with a rotating disk (205), and the output end is connected to the generator (101); The outer circumferential surface of the cover shell (203) is provided with a sliding hole in the radial direction, and a sliding rod (206) is slidably installed in the sliding hole. The outer circumferential surface of the rotating disk (205) is provided with a protrusion (2051) and a groove (2052) and an arc surface located therebetween. When the motor (100) is running to drive the cover shell (203) to rotate, the rotation direction is rotation direction one. The protrusion (2051) is located in front of the groove (2052) along rotation direction one. Initially, the sliding rod (206) is located between the protrusion (2051) and the groove (2052), and the sliding rod (206) is in contact with the protrusion (2051). A guide rod extends from the closed end of the cover (203), and a push rack (207) is slidably connected to the guide rod; The push frame (207) is provided with a first inclined plane, and the end of the slide rod (206) away from the axis of the cover shell (203) is provided with a second inclined plane, and the first inclined plane is in contact with the second inclined plane. The push frame (207) is connected to the middle bracket (301), and the switch 1 is located on the side of the middle bracket (301) facing the connecting shaft 1 (201).

2. The AC / DC dual power switching device according to claim 1, characterized in that: The side touch rod is slidably mounted on the mounting frame, and an external step is provided on the outside of the side touch rod. The outer sleeve of the side touch rod 1 (304) is provided with a spring 1 (305) located between the external step and the mounting frame, and the outer sleeve of the side touch rod 2 (306) is provided with a spring 2 (307) located between the external step and the mounting frame. The spring 1 (305) and the spring 2 (307) are insulated and the elastic force of both are used to drive the corresponding side touch rod to approach the other side touch rod.

3. The AC / DC dual power switching device according to claim 2, characterized in that: The first connecting shaft (201) and the second connecting shaft (202) are mounted on the mounting frame through bearings and are parallel to the sliding direction of the side contact rod.

4. The AC / DC dual power switching device according to claim 3, characterized in that: A limit ring is provided at the end of the guide rod, and a spring 3 (208) is provided on the outer sleeve of the guide rod and is located between the limit ring and the push frame (207); When the slide bar (206) moves away from the axis of the housing (203), the push frame (207) can be pushed to move away from the connecting shaft (201) through the cooperation between the inclined surface 1 and the inclined surface 2.

5. The AC / DC dual power switching device according to claim 1, characterized in that: The cover shell (203) is in the shape of a cylindrical shell with one end open and provided with a shell cover (204) and one end closed. The shell cover (204) is connected to the first connecting shaft (201).

6. The AC / DC dual power switching device according to claim 1, characterized in that: A roller is installed at the end of the slide bar (206) facing the axis of the cover shell (203), and the roller contacts the arc surface.

7. The AC / DC dual power switching device according to claim 1, characterized in that: The connection between the groove (2052) and the arc surface is rounded.

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