Electromagnetic driving device and change-over switch

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an electromagnetic driving device and a change-over switch, which comprises a housing, a movable iron core assembly, an excitation assembly and a driving wheel, a first cavity used for containing the driving wheel and a second cavity used for allowing the movable iron core assembly to move are formed in the housing. A first rotary connecting part is arranged in the first cavity, and a driving wheel is arranged on the first rotary connecting part; the movable iron core assembly is at least partially arranged in the second cavity in a penetrating mode, and the movable iron core assembly is driven by the excitation assembly to move in the extending direction of the second cavity and drives the driving wheel to rotate around the first rotating connecting part. The extending direction of the second cavity is perpendicular to the rotating axis of the driving wheel. The mounting cavity is formed in the housing, so that the movable iron core assembly and the driving wheel are mounted and matched, the number of parts is effectively reduced, the mounting and matching precision is improved, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to an electromagnetic drive device and a changeover switch. Background Technology

[0002] Changeover switches typically utilize a moving iron core assembly to control the opening and closing of moving contacts, thereby changing the circuit connection state and switching between different power sources, loads, or signal sources. They are widely used in power systems, industrial control, and automation equipment, especially in applications requiring high reliability and fast response. In existing technologies, sheet metal structural components are typically used as supports, and other parts are then bolted onto these components. Firstly, existing technologies require integrating a large number of parts into the sheet metal structure, resulting in a high number of components and higher manufacturing costs. Secondly, the poor precision of the mounting structure formed by bending the sheet metal component leads to significant play and clearance in the push-pull rod driven by the moving iron core during linear movement, reducing the fit accuracy of the structural components. Utility Model Content

[0003] The purpose of this application is to provide an electromagnetic drive device and a changeover switch, which forms an installation chamber on the housing to realize the installation and mating of the moving iron core assembly and the drive wheel, effectively reducing the number of parts, improving the installation and mating accuracy, and reducing costs.

[0004] The embodiments of this application are implemented as follows:

[0005] In a first aspect, embodiments of this application provide an electromagnetic drive device, including a housing, a moving iron core assembly, an excitation assembly, and a drive wheel; the housing has a first chamber for accommodating the drive wheel and a second chamber for moving the moving iron core assembly; the first chamber has a first rotating connection portion, and the drive wheel is disposed on the first rotating connection portion; the moving iron core assembly is at least partially disposed within the second chamber, the second chamber is located on both sides of the first chamber, and a clearance channel is provided between the first chamber and the second chamber for connecting the two; the moving iron core assembly moves along the extension direction of the second chamber under the drive of the excitation assembly, and drives the drive wheel to rotate around the first rotating connection portion; wherein, the extension direction of the second chamber is perpendicular to the rotation axis of the drive wheel.

[0006] As an optional implementation, the inner wall of the second chamber has a guide groove; the moving iron core assembly includes a moving iron core and a push-pull rod; the first end of the push-pull rod is connected to the moving iron core, and the second end passes through the guide groove and can abut against the drive wheel.

[0007] As an optional implementation, at least one side of the guide groove extending in the direction of extension has a U-shaped groove with an opening facing the push-pull rod, and the push-pull rod is provided with a protrusion that engages with the U-shaped groove.

[0008] As an optional implementation, the second end of the push-pull rod is provided with a pivotable lever, which can pass through the clearance channel and be linked with the drive wheel; it also includes a frame plate for mounting the excitation assembly, the cover having an intersecting first contact surface and a second contact surface; the first contact surface abuts against the surface of the frame plate; the second contact surface abuts against the excitation assembly.

[0009] As an optional implementation, the excitation assembly further includes an electromagnetic coil; the moving iron core is inserted into the electromagnetic coil along the extension direction of the guide groove, and the electromagnetic coil generates a force that causes the push-pull rod to move closer to the electromagnetic coil when energized; it also includes a spring element, one end of which is connected to the cover or frame plate and the other end is connected to the moving iron core assembly, for generating a force that causes the push-pull rod to move away from the electromagnetic coil.

[0010] As an optional implementation, the housing is provided with a second rotating connection part, and the second rotating connection part is provided with a linkage wheel that meshes with the drive wheel. The linkage wheel is used to drive the moving contact to move.

[0011] As an optional implementation, the housing is provided with a third rotating connection part, and the third rotating connection part is provided with a handle operation wheel that meshes with the linkage wheel for manual operation of the product.

[0012] As an optional implementation, the housing is provided with a first mounting portion, which is used to mount a reset structure for resetting the drive wheel.

[0013] As an optional implementation, a second mounting portion is provided on the outer side of the cover, and the second mounting portion is provided with a lever operating component, which is used to control the movement of the lever.

[0014] As an optional implementation, there are two guide grooves that are parallel to each other, and the two guide grooves are respectively arranged on both sides of the drive wheel; there are two moving iron core assemblies, and the push-pull rods of the two moving iron core assemblies are respectively connected to the two guide grooves.

[0015] Secondly, embodiments of this application provide a changeover switch, including the aforementioned electromagnetic drive device and a moving contact; the drive wheel of the electromagnetic drive device is linked with the moving contact to control the opening and closing of the moving contact.

[0016] The beneficial effects of the embodiments of this application include:

[0017] Firstly, compared with the prior art, the electromagnetic drive device provided in this application embodiment forms an installation chamber on the housing, which enables precise installation and matching of the moving iron core assembly, drive wheel and other structures, integrating them into a modular part, effectively eliminating the shaking of the moving iron core assembly during movement and reducing the mechanical failure rate of the electromagnetic drive device; the embodiment of this application can also effectively reduce the number of parts, reduce assembly difficulty and reduce production costs.

[0018] Secondly, embodiments of this application provide a changeover switch, including the aforementioned electromagnetic drive device and a moving contact; the drive wheel of the electromagnetic drive device is linked with the moving contact to control the opening and closing of the moving contact. Compared to the prior art, the changeover switch of this application embodiment forms a guide groove and a first rotating connection part on the housing, which not only enables precise cooperation with the push-pull rod, effectively eliminating the shaking of the push-pull rod during movement and reducing the mechanical failure rate of the drive device; this application embodiment also effectively reduces the number of parts and lowers the assembly difficulty. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of the electromagnetic drive device according to an embodiment of this application;

[0021] Figure 2 This is a second schematic diagram of the structure of the electromagnetic drive device according to an embodiment of this application;

[0022] Figure 3 This is the third schematic diagram of the electromagnetic drive device according to an embodiment of this application;

[0023] Figure 4 This is the fourth schematic diagram of the electromagnetic drive device according to an embodiment of this application;

[0024] Figure 5 This is the fifth schematic diagram of the electromagnetic drive device according to an embodiment of this application;

[0025] Figure 6 This is the sixth schematic diagram of the electromagnetic drive device according to an embodiment of this application;

[0026] Figure 7 This is the seventh schematic diagram of the electromagnetic drive device according to an embodiment of this application.

[0027] icon:

[0028] 100-Cover; 101-Moving iron core assembly; 102-First rotating connection part; 103-Drive wheel; 104-Guide groove; 105-Moving iron core; 106-Push-pull rod; 107-U-shaped groove; 108-Protrusion; 109-First chamber; 110-Second chamber; 111-Lever; 112-Frame plate; 113-Excitation assembly; 114-First contact surface; 115-Second contact surface; 116-Spring element; 117-Second rotating connection part; 118-Linkage wheel; 119-Third rotating connection part; 120-Handle operating wheel; 121-Second mounting part. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Changeover switches typically utilize a moving iron core assembly to control the opening and closing of the moving contacts, thereby changing the circuit connection state and switching between different power sources, loads, or signal sources. They are widely used in power systems, industrial control, and automation equipment, especially in applications requiring high reliability and rapid response. In existing technologies, sheet metal structures are typically used as supports. However, due to the complexity of sheet metal manufacturing and the inability to directly integrally mold multiple components onto a sheet metal structure, bolts and other connectors are needed to install a large number of parts. This not only results in a large number of parts but also complicates the assembly process. Over prolonged use, components on the sheet metal structure are prone to loosening, reducing the overall structural stability and causing mechanical failures in the electromagnetic drive device. Furthermore, the poor precision of the guide grooves formed by bending the sheet metal structure leads to significant wobbling and clearance in the linear motion of the push-pull rod driven by the moving iron core, hindering precise guidance and reducing the control accuracy of the moving contacts.

[0034] To address the aforementioned technical problems, embodiments of this application provide an electromagnetic drive device and a changeover switch.

[0035] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the electromagnetic drive device provided in this application embodiment includes a housing 100, a moving iron core assembly 101, an excitation assembly 113, and a drive wheel 103. The housing 100 has a first chamber 109 for accommodating the drive wheel 103 and a second chamber 110 for moving the moving iron core assembly 101. The first chamber 109 has a first rotating connection portion 102, and the drive wheel 103 is mounted on the first rotating connection portion 102. The moving iron core assembly 101 is at least partially inserted into the second chamber 110. The second chamber 110 is located on both sides of the first chamber 109, and a clearance channel is provided between the first chamber 109 and the second chamber 110 to connect the two. The moving iron core assembly 101 moves along the extension direction of the second chamber 110 under the drive of the excitation assembly 113, and drives the drive wheel 103 to rotate around the first rotating connection portion 102. The extension direction of the second chamber 110 is perpendicular to the rotation axis of the drive wheel 103.

[0036] Specifically, such as Figure 3 as well as Figure 4As shown, the inner wall of the second chamber 110 has a guide groove 104; the moving iron core assembly 101 includes a moving iron core 105 and a push-pull rod 106; the first end of the push-pull rod 106 is connected to the moving iron core 105, and the second end passes through the guide groove 104 and can abut against the drive wheel 103; the moving iron core 105 is driven to move the push-pull rod 106 along the extension direction of the guide groove 104, and the push-pull rod 106 drives the drive wheel 103 to rotate around the first rotating connection part 102; wherein, the extension direction of the guide groove 104 is perpendicular to the rotation axis of the drive wheel 103.

[0037] It should be noted that the housing 100 in this embodiment is integrally molded using injection molding. The housing 100 is formed by injection molding of components including the guide groove 104 and the first rotating connection part 102, avoiding the use of bolts to install a large number of additional components, thus effectively reducing the number of components. Compared with traditional sheet metal materials, plastic materials have better formability and dimensional stability, making them suitable for the manufacture of precision guiding and connecting components.

[0038] In this embodiment, the first rotating connection portion 102 is formed directly within the housing 100, eliminating the need for additional bolts or other fasteners and simplifying the assembly process. Furthermore, because it is integrally molded, it avoids the cumulative errors that may occur when assembling multiple parts, thus improving the overall structural accuracy.

[0039] The guide groove 104 of this application embodiment is formed directly on the cover 100, which can achieve precise cooperation with the push-pull rod 106, reduce the swaying gap of the push-pull rod 106 during the movement process, and improve the control accuracy of the moving contact.

[0040] In this embodiment, the moving iron core 105 is driven by electromagnetic force, which drives the push-pull rod 106 to move along the guide groove 104. One end of the push-pull rod 106 is connected to the moving iron core 105, and the other end passes through the guide groove 104 and can abut against the drive wheel 103, which is responsible for converting the linear motion of the moving iron core 105 into the rotational motion of the drive wheel 103.

[0041] In this embodiment, the drive wheel 103 is fixed by the first rotating connection 102 and rotates around its rotation axis, which is perpendicular to the extension direction of the guide groove 104. The movement of the push-pull rod 106 directly drives the drive wheel 103 to rotate, thereby driving other mechanical components to complete the circuit switching action.

[0042] It should be noted that at least two moving iron core assemblies 101 may be provided in this embodiment of the application, and those skilled in the art can make such arrangements as needed.

[0043] For example, such as Figure 4 , Figure 5As shown, there are two guide grooves 104 that are parallel to each other, and the two guide grooves 104 are respectively arranged on both sides of the drive wheel 103; there are two moving iron core assemblies 101, and the push-pull rods 106 of the two moving iron core assemblies 101 are respectively set to correspond to the two guide grooves 104.

[0044] The beneficial effects that the embodiments of this application can produce are:

[0045] Firstly, the housing 100 in this embodiment is integrally formed by injection molding, integrating multiple key components such as the guide groove 104 and the first rotating connection part 102. This avoids the need for a large number of bolts and other connecting parts required by traditional sheet metal structures, significantly reducing the number of parts. Compared with traditional sheet metal structures, the housing 100 can not only meet complex structural design requirements, but also has the advantage of being lightweight.

[0046] Secondly, the reduced number of parts in this application means that the assembly process is simpler and faster, reducing production costs and time.

[0047] Thirdly, the precise fit between the guide groove 104 and the push-pull rod 106 in this embodiment eliminates any wobbling or gaps that may occur during the movement of the push-pull rod 106, making the movement of the moving iron core assembly 101 more accurate. The higher control precision of this embodiment helps improve the overall performance of the changeover switch, especially in applications requiring rapid response and high-precision operation.

[0048] Reference Figure 5 as well as Figure 6 As shown, in one optional embodiment, at least one side of the guide groove 104 extending in the direction of extension has a U-shaped groove 107 with an opening facing the push-pull rod 106, and the push-pull rod 106 is provided with a protrusion 108, which is connected to the U-shaped groove 107.

[0049] It should be noted that, in this embodiment of the application, the guide groove 104 is provided with a U-shaped groove 107 with an opening facing the push-pull rod 106 on one or both sides. In this embodiment of the application, the U-shaped groove 107 is arranged along the extension direction of the guide groove 104, and its opening faces the push-pull rod 106, so that the protrusion 108 on the push-pull rod 106 can smoothly enter and slide along the U-shaped groove 107.

[0050] The U-shaped groove 107 in this embodiment provides additional support and guidance, ensuring that the push-pull rod 106 maintains the correct path during its movement. The protrusion 108 in this embodiment increases the contact area between the push-pull rod 106 and the guide groove 104, thereby improving the stability of the push-pull rod 106 during movement and reducing swaying and deviation.

[0051] It should be noted that those skilled in the art can provide U-shaped grooves 107 on one or both sides of the guide groove 104 as needed. For example, U-shaped grooves 107 are provided on opposite sides of the guide groove 104.

[0052] This embodiment of the application significantly reduces the swaying gap of the push-pull rod 106 during linear motion through the design of the U-shaped groove 107 and the protrusion 108, making the movement of the moving iron core assembly 101 more precise and improving the control accuracy of the changeover switch. In addition, due to the addition of extra support points, the push-pull rod 106 can maintain a stable movement trajectory throughout its entire stroke, avoiding mechanical failures caused by deviation.

[0053] Reference Figure 3 , Figure 4 As shown, in one optional implementation, the housing 100 forms a first chamber 109, a second chamber 110, and a clearance channel for connecting the first chamber 109 and the second chamber 110; the drive wheel 103 is installed in the first chamber 109, and at least a portion of the push-pull rod 106 and the moving iron core 105 are installed in the second chamber 110; the second end of the push-pull rod 106 is provided with a pivotable lever 111, which passes through the clearance channel and is linked with the drive wheel 103.

[0054] The first chamber 109 in this embodiment is an independent space inside the housing 100, mainly used for installing the drive wheel 103 and the first rotating connection part 102. This chamber provides sufficient operating space for the drive wheel 103, ensuring that it can rotate freely. The first chamber 109 is integrally formed on the housing 100, reducing assembly complexity and improving the stability and precision of the overall structure.

[0055] The second chamber 110 in this embodiment is another independent space, mainly used to install at least part of the structure of the push-pull rod 106 and the moving iron core 105. This chamber provides movement space for the moving iron core assembly 101, ensuring that it can move smoothly under the action of electromagnetic force. The second chamber 110 is connected to the first chamber 109 through a clearance channel, but the two remain relatively independent to avoid unnecessary mechanical interference and electrical interference. The clearance channel allows the lever 111 of the push-pull rod 106 to pass through, thereby realizing the linkage between the push-pull rod 106 and the drive wheel 103.

[0056] This embodiment of the application achieves a reasonable division of functional areas by installing the drive wheel 103 and the push-pull rod 106 in different chambers. The relative independence between the first chamber 109 and the second chamber 110 helps reduce mutual interference between mechanical components, avoids direct contact and mechanical interference between them, and reduces the risk of failure due to friction or collision. Especially for applications requiring high precision, it can significantly improve the stability of the system.

[0057] Reference Figure 1 , Figure 4 as well as Figure 6 As shown, as an optional embodiment, it also includes a frame plate 112 for mounting the excitation assembly 113. The cover 100 has an intersecting first contact surface 114 and a second contact surface 115. The first contact surface 114 abuts against the surface of the frame plate 112. The second contact surface 115 abuts against the excitation assembly 113, thereby modularizing the electromagnetic drive device for convenient assembly.

[0058] The frame plate 112 in this embodiment is a rigid support structure used to fix and support the excitation component 113 in the moving iron core assembly 101. The frame plate 112 helps to ensure the mechanical stability of the excitation component 113. The main function of the excitation component 113 is to guide the magnetic field so that the electromagnetic force can effectively act on the moving iron core 105, thereby pushing the push-pull rod 106 to move linearly.

[0059] It should be noted that the housing 100 in this embodiment has a first contact surface 114, which abuts tightly against the surface of the frame plate 112. This design ensures good contact between the housing 100 and the frame plate 112, improving the mechanical stability of the entire device. The housing 100 also has a second contact surface 115, which abuts tightly against the excitation assembly 113. This design not only provides additional support but also ensures accurate positioning of the housing 100 during assembly. Through the clearly defined contact surface design, this embodiment allows assembly workers to complete the assembly of various components more quickly and accurately, reducing the time and cost of debugging and calibration.

[0060] Furthermore, refer to Figure 6 As shown, the excitation assembly 113 in this embodiment includes an electromagnetic coil; a moving iron core 105 is inserted into the electromagnetic coil along the extension direction of the guide groove 104, and the electromagnetic coil generates a force that causes the push-pull rod 106 to move closer to the electromagnetic coil when energized. In addition, one end of the spring element 116 is connected to the cover 100 and the other end is connected to the moving iron core assembly 101, and is used to generate a force that causes the push-pull rod 106 to move away from the electromagnetic coil.

[0061] It should be noted that the housing 100 is provided with a mounting groove for accommodating the spring element 116, and the extension direction of the mounting groove is consistent with the extension direction of the guide groove 104.

[0062] Reference Figure 4 as well as Figure 7 As shown, as an optional implementation, the housing 100 is provided with a second rotating connection part 117, and the second rotating connection part 117 is provided with a linkage wheel 118 that meshes with the drive wheel 103. The linkage wheel 118 is used to drive the moving contact to move.

[0063] Furthermore, the housing is provided with a first mounting part, which is used to mount a reset structure for resetting the drive wheel.

[0064] It should be noted that the reset structure can be a reset spring; one end of the reset spring is connected to the drive wheel 103, and the other end is connected to the first mounting part on the cover 100. Depending on the needs, the first mounting part can also be provided on the frame plate 112. For example, a hole is provided on the frame plate 112, one end of the reset spring is connected to the drive wheel 103, and the other end is hooked to the hole on the frame plate 112. The reset spring can generate an elastic force that causes the drive wheel 103 to rotate towards the center position.

[0065] Reference Figure 1 As shown, in one optional embodiment, a second mounting portion 121 is provided on the outer side of the cover 100, and the second mounting portion 121 is provided with a lever operating member, which is used to control the movement of the lever 111.

[0066] It should be noted that the lever operating component can control the rotation of the lever 111, so that the lever 111 can avoid interference with the drive wheel 103 during the rotation of the drive wheel 103.

[0067] The cover 100 is provided with a third rotating connection part 119, and the third rotating connection part 119 is provided with a handle operation wheel 120 that meshes with the linkage wheel 118 for manual operation of the changeover switch.

[0068] It should be noted that, in this embodiment of the application, a second rotating connection portion 117 and a third rotating connection portion 119 are integrally formed on the cover 100.

[0069] The housing 100 of this embodiment is integrally formed by injection molding, integrating multiple key components such as the guide groove 104, the first rotating connection part 102, the second rotating connection part 117, and the third rotating connection part 119. This avoids the need for a large number of bolts and other connecting parts required by traditional sheet metal structures, significantly reducing the number of parts. In addition, the reduced number of parts in this embodiment means that the assembly process is simpler and faster, reducing production costs and time.

[0070] The first rotating connection part 102, the second rotating connection part 117 and the third rotating connection part 119 can be a rotating hole or a rotating shaft. Those skilled in the art can choose according to their needs, and no special limitation is made here.

[0071] This application provides a changeover switch, including the aforementioned electromagnetic drive device and a moving contact; the drive wheel 103 of the electromagnetic drive device is linked with the moving contact to control the opening and closing of the moving contact.

[0072] The changeover switch provided in this application uses the above-mentioned electromagnetic drive device. Compared with the prior art, the changeover switch in this application has a guide groove 104 and a first rotating connection part 102 formed on the housing 100. This not only enables precise cooperation with the push-pull rod 106 and effectively eliminates the shaking of the push-pull rod 106 during movement, but also reduces the mechanical failure rate of the drive device. Furthermore, this application can effectively reduce the number of parts and reduce the assembly difficulty.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electromagnetic drive device, characterized in that, The assembly includes a housing (100), a moving iron core assembly (101), an excitation assembly (113), and a drive wheel (103). The housing (100) has a first chamber (109) for accommodating the drive wheel (103) and a second chamber (110) for moving the moving iron core assembly (101). The first chamber (109) has a first rotating connection (102), and the drive wheel (103) is mounted on the first rotating connection (102). The moving iron core assembly (101) passes through at least part of the second chamber (103). Inside the chamber (110), the second chamber (110) is located on both sides of the first chamber (109), and a clearance passage for connecting the first chamber (109) and the second chamber (110) is provided; the moving iron core assembly (101) moves along the extension direction of the second chamber (110) under the drive of the excitation assembly (113), and drives the drive wheel (103) to rotate around the first rotating connection part (102); wherein, the extension direction of the second chamber (110) is perpendicular to the rotation axis of the drive wheel (103).

2. The electromagnetic drive device according to claim 1, characterized in that, The inner wall of the second chamber (110) has a guide groove (104); the moving iron core assembly (101) includes a moving iron core (105) and a push-pull rod (106); the first end of the push-pull rod (106) is connected to the moving iron core (105), and the second end passes through the guide groove (104) and can abut against the drive wheel (103).

3. The electromagnetic drive device according to claim 2, characterized in that, The guide groove (104) has a U-shaped groove (107) with an opening facing the push-pull rod (106) on at least one side of its extension direction. The push-pull rod (106) is provided with a protrusion (108), which is connected to the U-shaped groove (107).

4. The electromagnetic drive device according to claim 2, characterized in that, The second end of the push-pull rod (106) is provided with a pivotable lever (111), which can pass through the clearance channel and be linked with the drive wheel (103); it also includes a frame plate (112) for mounting the excitation assembly (113), and the cover (100) has an intersecting first contact surface (114) and a second contact surface (115); the first contact surface (114) abuts against the surface of the frame plate (112); the second contact surface (115) abuts against the excitation assembly (113).

5. The electromagnetic drive device according to claim 4, characterized in that, The excitation assembly (113) also includes an electromagnetic coil; the moving iron core (105) is inserted into the electromagnetic coil along the extension direction of the guide groove (104), and the electromagnetic coil generates a force that causes the push-pull rod (106) to move closer to the electromagnetic coil when energized; it also includes a spring element (116), one end of which is connected to the cover (100) or the frame plate (112) and the other end is connected to the moving iron core assembly (101), and is used to generate a force that causes the push-pull rod (106) to move away from the electromagnetic coil.

6. The electromagnetic drive device according to any one of claims 1-5, characterized in that, The cover (100) is provided with a second rotating connection part (117), and the second rotating connection part (117) is provided with a linkage wheel (118) that meshes with the drive wheel (103). The linkage wheel (118) is used to drive the moving contact to move.

7. The electromagnetic drive device according to claim 6, characterized in that, The cover (100) is provided with a third rotating connection part (119), and the third rotating connection part (119) is provided with a handle operation wheel (120) that meshes with the linkage wheel (118) for manual operation of the product.

8. The electromagnetic drive device according to claim 6, characterized in that, The housing (100) is provided with a first mounting part, which is used to install a reset structure for resetting the drive wheel (103).

9. The electromagnetic drive device according to claim 6, characterized in that, The outer side of the cover (100) is provided with a second mounting part (121), and the second mounting part (121) is provided with a lever operating component, which is used to control the movement of the lever (111).

10. A changeover switch, characterized in that, It includes the electromagnetic drive device and the moving contact as described in any one of claims 1-9; the drive wheel (103) of the electromagnetic drive device is linked with the moving contact to control the opening and closing of the moving contact.

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