An electromagnetic coil frame with an expandable and contractible diameter

Abstract

This application relates to an electromagnetic coil frame with an expandable and contractible diameter, belonging to the field of electromagnetic coil technology. It includes a central assembly, an expansion and contraction assembly, a pushing assembly, and a nut. The central assembly includes a central shaft and a connecting member. The first end of the central shaft is connected to the center of the connecting member, which is connected to a winding machine. The expansion and contraction assembly includes multiple expansion and contraction blocks and an annular elastic member. The expansion and contraction blocks are distributed around the central shaft and slidably connected to the connecting member. The annular elastic member surrounds the multiple expansion and contraction blocks, and the electromagnetic coil is wound around the outer periphery of the expansion and contraction blocks. The pushing assembly includes a conical member, the diameter of the first end of which is smaller than the diameter of the second end. The conical member slides through the central shaft, and its outer periphery engages with the multiple expansion and contraction blocks. The nut is screwed to the second end of the central shaft and is located on the side of the conical member away from the connecting member. This application satisfies the needs of winding electromagnetic coils and placing them spaced apart within a U-shaped housing groove.

Description

Technical Field

[0001] This application relates to the field of electromagnetic coil technology, and in particular to an electromagnetic coil frame with an expandable and contractible diameter. Background Technology

[0002] In the field of electromagnetic coil technology, with the continuous development of related technologies, electromagnetic coils are playing an increasingly important role in many fields. Small electromagnetic coils are widely used in electronic equipment and automation control, and their manufacturing technology is relatively mature. In recent years, some new applications have placed higher demands on electromagnetic coils, such as requiring electromagnetic coils with large electromagnetic force and large diameter. These types of coils have unique application value in specific industrial equipment, large instruments, and other fields, driving electromagnetic coil manufacturing technology towards more complex and efficient directions.

[0003] Currently, the manufacturing of small electromagnetic coils mostly involves using molds or machined frames of a fixed diameter, followed by winding wire onto the frame using manual or automatic winding machines. This method is common and mature in the production of small-sized, fixed-specification electromagnetic coils.

[0004] However, when faced with electromagnetic coils that require large electromagnetic force and large diameter, since these large-diameter electromagnetic coils need to be placed inside a U-shaped outer casing and maintain a gap with the inner wall of the U-shaped outer casing, it is impossible to use a traditional fixed-diameter frame, nor can the wire be wound directly on the U-shaped outer casing.

[0005] Among the aforementioned related technologies, there are limitations in the use of fixed-diameter bobbin winding for small electromagnetic coils, which cannot meet the manufacturing requirements of large-diameter electromagnetic coils with large electromagnetic force that need to be placed at intervals in the U-shaped outer casing groove. These limitations make it difficult to adapt to the requirements of new application scenarios. Utility Model Content

[0006] In order to meet the needs of winding electromagnetic coils and placing electromagnetic coils at intervals in the U-shaped housing groove, this application provides an electromagnetic coil frame with an expandable and contractible diameter.

[0007] The electromagnetic coil frame with expandable and contractible diameter provided in this application adopts the following technical solution: An expandable and contractible electromagnetic coil frame includes: a central assembly comprising a central shaft and a connector, the first end of the central shaft being connected to the center of the connector, the axis of the central shaft being collinear with the axis of the connector, and the connector being used to connect to a winding machine; an expansion and contraction assembly comprising a plurality of expansion and contraction blocks and an annular elastic element, the expansion and contraction blocks being distributed around the circumference of the central shaft, the expansion and contraction blocks being slidably connected to the connector, the annular elastic element surrounding the plurality of expansion and contraction blocks, the annular elastic element being used to drive the plurality of expansion and contraction blocks to move closer to each other, and an electromagnetic coil being used to wind around the outer periphery of the expansion and contraction blocks; and a pushing assembly comprising a conical member, the first end of the conical member being... The diameter of the first end is smaller than the diameter of the second end of the conical member. The conical member slides along the central shaft, and the first end of the conical member is located on the side of the second end of the conical member close to the connector. The outer periphery of the conical member cooperates with a plurality of expansion and contraction blocks. The movement of the conical member along the axial direction of the central shaft is used to separate or bring the plurality of expansion and contraction blocks relative to each other, so as to selectively support and be used for winding an electromagnetic coil or unwinding a wound electromagnetic coil. A nut is screwed to the second end of the central shaft. The nut is located on the side of the conical member away from the connector. The nut is used to push the second end of the conical member, so that the conical member can move towards the connector.

[0008] By adopting the above technical solution, the central axis of the central component is connected to the connecting piece, which is used to connect to the winding machine, providing a connection basis for the entire skeleton to the winding machine and ensuring the smooth operation of the winding. Multiple expansion and contraction blocks of the expansion and contraction assembly are distributed circumferentially around the central axis and slidably connected to the connecting piece. An annular elastic element surrounds the multiple expansion and contraction blocks, enabling them to move closer together. The electromagnetic coil is wound around the outer circumference of the expansion and contraction blocks, allowing the skeleton to support the winding of the electromagnetic coil. The tapered component of the pushing assembly slides through the central axis, its outer circumference cooperating with multiple expansion and contraction blocks. Moving along the central axis allows the multiple expansion and contraction blocks to separate or move closer together, realizing the ability to change the outer diameter formed by the expansion and contraction blocks as needed. This allows for selective support and winding of the electromagnetic coil, and the removal of the wound electromagnetic coil by reducing the outer diameter, facilitating the placement of the wound electromagnetic coil at intervals into the U-shaped outer casing groove. The nut is screwed to the second end of the central axis, pushing the tapered component towards the connecting piece, providing power for the movement of the tapered component. This frame enables the winding of electromagnetic coils and allows for the smooth removal of the wound electromagnetic coils, meeting usage requirements. It can also accommodate electromagnetic coils with a certain diameter range, increasing product diversity, improving applicability, and reducing product development costs.

[0009] Optionally, the tapered member includes a tapered portion and a pushing plane portion. The diameter of the first end of the tapered portion is smaller than the diameter of the second end of the tapered portion. The second end of the tapered portion is connected to the pushing plane portion. The outer periphery of the tapered portion engages with the side of the plurality of expansion and contraction blocks near the central axis. The first end of the tapered portion is used to extend between the plurality of expansion and contraction blocks.

[0010] By adopting the above technical solution, the diameter of the first end of the tapered part is smaller than the diameter of the second end. The first end is used to extend between multiple expansion and contraction blocks, and its outer periphery cooperates with the side of the multiple expansion and contraction blocks near the central axis. When the tapered part moves along the central axis, the tapered part can be used to separate or move closer to each other by changing the taper of the tapered part, so as to selectively support and wind the electromagnetic coil or unwind the completed electromagnetic coil. The pushing flat part is connected to the second end of the tapered part and can be used to cooperate with the nut or other components to receive the thrust of the nut and push the tapered part as a whole towards the connecting part, thereby realizing the pushing effect on the expansion and contraction blocks, or when it is necessary to reduce the outer diameter of the expansion and contraction blocks, the pushing effect on the tapered part can be released, thereby changing the outer diameter formed by the expansion and contraction blocks to meet the winding requirements of electromagnetic coils of different diameters.

[0011] Optionally, the pushing assembly includes a pressing member and a plurality of tightening members. The pressing member has a through hole in its center and slides through the central shaft. The tapered portion passes through the through hole of the pressing member. The pushing plane portion is located on the side of the pressing member away from the expansion and contraction block. The plurality of tightening members are distributed on the pushing plane portion and are screwed to the pushing plane portion. The tightening members are used to tighten the pressing member so that the pressing member fits against the side of the expansion and contraction block away from the connecting member.

[0012] By adopting the above technical solution, the through hole in the center of the pressing member allows the pressing member to slide on the central shaft, and the tapered part can pass through the through hole. The pushing plane is located on the side of the pressing member away from the expansion and contraction block. Multiple clamping members distributed on the pushing plane are screwed to the pushing plane. By clamping the pressing member with the clamping members, the pressing member can be made to fit against the side of the expansion and contraction block away from the connecting member. The pressing member and the expansion and contraction block ensure the required width for winding, making the winding process of the electromagnetic coil more stable.

[0013] Optionally, the pushing plane is provided with a plurality of first clearance portions, and the pressing member is provided with a plurality of second clearance portions. The first clearance portions and the second clearance portions correspond one-to-one. The first clearance portions are correspondingly provided with the fitting gap between the first clearance portions and the two adjacent expansion and contraction blocks. The first clearance portions, the second clearance portions and the fitting gap are used to pass through the fastening member, and the fastening member is used to fasten the electromagnetic coil.

[0014] By adopting the above technical solution, the first clearance part opened in the push flat part and the second clearance part opened in the pressing part correspond to the matching gap between the two adjacent expansion and contraction blocks, so that the fastening part can pass through smoothly. The fastening part can fasten the electromagnetic coil wound on the outer periphery of the expansion and contraction block, which makes it easier to remove the wound electromagnetic coil from the skeleton later.

[0015] Optionally, the pushing assembly includes two positioning members, the pushing plane portion is provided with two first strip holes, the pressing member is provided with two second strip holes, the positioning members, the first strip holes and the second strip holes are all correspondingly arranged, at least two of the expansion blocks are provided with positioning holes, the positioning holes correspond to the positioning members, one end of the positioning member is connected to the positioning hole, and the other end of the positioning member passes through the corresponding second strip hole and the first strip hole, so that the first clearance portion, the second clearance portion and the mating gap are aligned in pairs.

[0016] By adopting the above technical solution, the positioning component, the first strip hole, and the second strip hole are correspondingly set and cooperate with the positioning hole on the expansion block. One end of the positioning component is connected to the positioning hole, and the other end passes through the second strip hole and the first strip hole. This can accurately position the relative position of the pushing plane, the pressing component, and the expansion block, restrict relative rotation, and ensure that the first clearance part, the second clearance part, and the mating gap are aligned in pairs. This facilitates the installation of the fastening component to tighten the electromagnetic coil and improves the convenience and efficiency of removing the electromagnetic coil after winding.

[0017] Optionally, the expansion block has a conical surface on the side near the central axis, and the conical surface is used to slide with the outer periphery of the conical part.

[0018] By adopting the above technical solution, the conical surface of the expansion and contraction block near the central axis slides in conjunction with the outer periphery of the conical part. When the conical part moves along the central axis, the special shape of the conical surface converts the axial movement of the conical part into the radial movement of the expansion and contraction block. Specifically, when the conical part moves towards the connecting member, its outer periphery generates an outward thrust on the conical surface, causing multiple expansion and contraction blocks to separate relative to each other, thereby increasing the outer diameter formed by the expansion and contraction blocks to support and wind the electromagnetic coil. When the conical part moves away from the connecting member, the expansion and contraction blocks move closer to each other under the action of the annular elastic element, reducing the outer diameter formed by the expansion and contraction blocks, thus enabling the wound electromagnetic coil to be easily removed, realizing the winding and removal operations of the electromagnetic coil under different diameter conditions.

[0019] Optionally, the expansion block is fan-shaped.

[0020] By adopting the above technical solution, the fan-shaped design of the expansion and contraction blocks allows multiple blocks, when distributed circumferentially around the central axis, to fit tightly together to form an approximately circular outer circumference, providing a good foundation for winding the electromagnetic coil. This fan-shaped structure enables the electromagnetic coil to be wound evenly around the outer circumference of the expansion and contraction blocks, ensuring the stability and uniformity of the winding, thereby improving the performance of the electromagnetic coil. During the expansion and contraction process, the fan-shaped expansion and contraction blocks can better achieve relative separation or mutual approach, facilitating the adjustment of the winding diameter of the electromagnetic coil according to actual needs. When it is necessary to wind electromagnetic coils with different inner diameters, the fan-shaped expansion and contraction blocks can increase the outer diameter by relative separation to meet the winding requirements of large inner diameter electromagnetic coils; by moving closer together to reduce the outer diameter, they can achieve the winding of small inner diameter electromagnetic coils, thus meeting the winding requirements of electromagnetic coils within a certain diameter range, increasing product diversity and reducing product development costs. At the same time, when removing the wound electromagnetic coil, the fan-shaped expansion and contraction blocks move closer together to reduce the outer diameter, allowing them to be smoothly removed from the electromagnetic coil, realizing winding and wire removal operations in the case of a frameless system.

[0021] Optionally, the expansion block is provided with a mounting groove, the mounting groove has an arc, and the annular elastic element is disposed in the mounting groove of the plurality of expansion blocks.

[0022] By adopting the above technical solution, the expansion and contraction block is provided with an arc-shaped mounting groove, which can be used to install an annular elastic element. The annular elastic element surrounds the mounting groove of multiple expansion and contraction blocks, which can drive multiple expansion and contraction blocks to move closer to each other, so that the expansion and contraction blocks can be stably attached together, which facilitates the electromagnetic coil to be wound on the outer circumference of the expansion and contraction block. At the same time, when the wound electromagnetic coil is removed, the annular elastic element can reduce the outer diameter of the expansion and contraction block after the conical part moves away from the connecting part, so as to smoothly remove the electromagnetic coil.

[0023] Optionally, the connector is provided with multiple sliding grooves, which are radially distributed around the central axis. The expansion block is provided with a slider, which is configured to correspond one-to-one with the sliding groove, and the slider is slidably connected to the sliding groove.

[0024] By adopting the above technical solution, multiple sliding grooves radially distributed on the connector with the central axis as the center correspond one-to-one with the sliders on the expansion and contraction blocks. This correspondence allows the expansion and contraction blocks to slide along the sliding grooves. The sliding of the sliders within the sliding grooves provides a stable sliding path for the expansion and contraction blocks, ensuring the sliding connection of the expansion and contraction blocks on the connector. This allows the expansion and contraction blocks to move smoothly on the connector, thereby enabling the relative separation or mutual approach of multiple expansion and contraction blocks. This allows for the selective support and winding of electromagnetic coils or the unwinding of completed electromagnetic coils.

[0025] Optionally, both the groove and the slider have T-shaped cross-sections.

[0026] By adopting the above technical solution, and setting the cross-section of both the slide groove and the slider to T-shape, it is possible to ensure that the expansion block slides stably along the slide groove of the connector. The T-shaped structure prevents the expansion block from detaching from the connector during the sliding process, ensuring the stability and reliability of the expansion assembly structure. This, in turn, allows the electromagnetic coil to be wound more stably around the outer circumference of the expansion block, improving the stability of the winding process and facilitating the smooth completion of the electromagnetic coil winding work.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. In cases where the electromagnetic coil to be wound has no frame, the winding machine is connected through the central component, and the component is pushed to expand and contract the diameter of the expansion and contraction component, so that the electromagnetic coil can be wound and taken out smoothly; 2. Multiple expansion blocks can be separated or brought closer together by pushing the conical part with the nut part, so as to meet the requirements of electromagnetic coil winding within a certain diameter range; 3. It can meet the manufacturing requirements of electromagnetic coils with large electromagnetic force and large diameter that need to be placed at intervals in the U-shaped outer casing slot, increasing product diversification and reducing product development costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an electromagnetic coil frame with an expandable and contractible diameter according to an embodiment of this application.

[0029] Figure 2 This is an exploded view of the electromagnetic coil frame with an expandable and contractible diameter according to an embodiment of this application.

[0030] Figure 3 This is a cross-sectional view of the electromagnetic coil frame with expandable and contractible diameter according to an embodiment of this application, in the state of median winding diameter.

[0031] Figure 4 This is a cross-sectional view of the electromagnetic coil frame with expandable and contractible diameter according to an embodiment of this application at its maximum winding diameter.

[0032] Figure 5 This is a cross-sectional view of the electromagnetic coil frame with expandable and contractible diameter according to an embodiment of this application in the minimum winding diameter state.

[0033] Explanation of reference numerals in the attached figures: 1. Central assembly; 11. Central shaft; 12. Connecting piece; 121. Slide groove; 2. Expansion / contraction components; 21. Expansion block; 211. Positioning hole; 212. Conical surface; 213. Mounting groove; 214. Slider; 22. Annular elastic element; 23. Fit clearance; 3. Drive the components; 31. Conical component; 311. Conical portion; 312. Pushing plane portion; 3121. First clearance portion; 3122. First strip hole; 32. Pressing part; 321. Through hole; 322. Second clearance part; 323. Second strip hole; 33. Tightening components; 34. Positioning components; 4. Nuts. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be further described in detail below. In this embodiment, unless otherwise specified, "connection", "linking", and "fixing" are interpreted broadly, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection, and interaction between two components, etc., and can be understood according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, in the description of this embodiment, terms such as "above," "below," "left," and "right," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are used only for ease of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise stated, directional terms such as "inner" and "outer" used in this application refer to the outline of the corresponding component itself.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown in the figure, this application discloses an electromagnetic coil frame (hereinafter referred to as "frame") capable of expanding and contracting diameter. The frame includes a central component 1, an expansion and contraction component 2, a push component 3, and a nut component 4. The nut drives the tapered component 31 of the push component 3 to expand and contract the expansion and contraction block 21 of the expansion and contraction component 2, thereby achieving the effect of adapting to electromagnetic coil windings of different diameters and smoothly removing them.

[0037] The central component 1 is connected to the winding machine to facilitate winding. The expansion and contraction component 2 is used to wind the electromagnetic coil. The nut 4 pushes the push component 3 to move. The position of the push component 3 can be controlled by the rotation of the nut 4. The push component 3 cooperates with the expansion and contraction component 2 to expand and contract, thereby changing the outer diameter of the expansion and contraction component 2. This achieves the effect of selectively supporting and winding the electromagnetic coil or unwinding the completed electromagnetic coil, realizing the winding and removal of the electromagnetic coil.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, specifically, the central component 1 includes a central shaft 11 and a connector 12. The central shaft 11 is typically a cylindrical rod-shaped structure, and its material can be metal, such as stainless steel, which has good strength and rigidity. The connector 12 can be disc-shaped, with the first end of the central shaft 11 connected to the center of the connector 12 by welding or integral molding, ensuring that the axis of the central shaft 11 is collinear with the axis of the connector 12. The connecting post on the side of the connector 12 away from the central shaft 11 is used to connect to the winding machine. The connection method is not limited; existing technologies can be selected as needed. For example, multiple bolt holes can be provided on the connector 12, and bolts can be used to fix the connecting post of the connector 12 to the connection part of the winding machine.

[0039] like Figure 1 , Figure 2 and Figure 3 As shown, the expansion and contraction assembly 2 includes multiple expansion and contraction blocks 21 and annular elastic elements 22. The expansion and contraction blocks 21 are fan-shaped and can be made of plastic or aluminum alloy, possessing a certain degree of hardness and wear resistance. The angular radius and number of fan-shaped blocks can be determined as needed; in this embodiment, four expansion and contraction blocks 21 are provided. The multiple expansion and contraction blocks 21 are distributed around the central axis 11 and are slidably connected to the connector 12. Specifically, the connector 12 is provided with multiple sliding grooves 121, which are radially distributed around the central axis 11 and extend through the outer periphery of the connector 12. The cross-sections of the sliding grooves 121 and the sliders 214 are both T-shaped. The expansion and contraction blocks 21 are provided with sliders 214 that correspond to and are slidably connected to the sliding grooves 121. This T-shaped structure design ensures that the expansion and contraction blocks 21 will not detach from the connector 12 during sliding and also makes the sliding of the expansion and contraction blocks 21 more stable.

[0040] An annular elastic element 22 surrounds multiple expansion and contraction blocks 21. The annular elastic element 22 can be a ring spring, made of spring steel, and has good elasticity, ensuring close contact between the expansion and contraction blocks 21 and the conical portion 311. The annular elastic element 22 is used to drive the multiple expansion and contraction blocks 21 closer together, reducing the winding diameter of the outer circumference of the expansion and contraction blocks 21. The electromagnetic coil is wound around the outer circumference of the expansion and contraction blocks 21. The expansion and contraction blocks 21 are provided with mounting grooves 213, which have an arc shape. The annular elastic element 22 is disposed within the mounting grooves 213 of the multiple expansion and contraction blocks 21, thus ensuring that the annular elastic element 22 will not fall off during the expansion and contraction of the expansion and contraction blocks 21.

[0041] like Figure 1 , Figure 2 and Figure 3As shown, the pushing assembly 3 includes a conical member 31, which may be conical in shape. The conical member 31 slides through the outer periphery of the central shaft 11, and the first end of the conical member 31 is closer to the connecting member 12 than the second end. The movement of the conical member 31 along the axial direction of the central shaft 11 is used to separate or bring the multiple expansion and contraction blocks 21 relative to each other. The conical member 31 includes a conical portion 311 and a pushing plane portion 312. The diameter of the first end of the conical portion 311 is smaller than the diameter of the second end of the conical portion 311. The second end of the conical portion 311 is connected to the pushing plane portion 312. The outer periphery of the conical portion 311 engages with the side of the multiple expansion and contraction blocks 21 near the central shaft 11. The expansion block 21 has a conical surface 212 on one side near the central axis 11. The conical surface 212 is used to slide and engage with the outer circumference of the conical part 311. This engagement between the conical surface 212 and the conical part 311 allows the conical part 31 to push the expansion block 21 to expand and contract more smoothly during movement. The dimensions and placement of the conical surface 212 can be determined according to actual needs. The conical outer circumference between the first and second ends of the conical part 311 is used to extend between multiple expansion blocks 21. This allows the expansion blocks 21 to be relatively dispersed when the conical part 311 moves axially toward the connecting member 12, increasing the winding diameter of the electromagnetic coil. When the conical part 311 moves axially away from the connecting member 12, the expansion blocks 21 are relatively gathered together under the elastic action of the annular elastic member 22, reducing the winding diameter of the electromagnetic coil.

[0042] like Figure 1 , Figure 2 and Figure 3As shown, the pushing assembly 3 also includes a pressing member 32 and multiple clamping members 33. The pressing member 32 has a through hole 321 at its center, and it slides along the central shaft 11. A tapered portion 311 passes through the through hole 321 of the pressing member 32, allowing the pressing member 32 and the tapered portion 31 to be positioned by the passage through the central shaft 11. The pushing plane portion 312 is located on the side of the pressing member 32 away from the expansion block 21. Multiple clamping members 33 are distributed on the pushing plane portion 312. The clamping members 33 can be hexagonal socket screws, and the material can be stainless steel. The clamping members 33 are screwed to the pushing plane portion 312, and they are used to clamp the pressing member 32, causing the pressing member 32 to fit against the side of the expansion block 21 away from the connecting member 12. The end of the expansion and contraction block 21 away from the connector 12 is used to wind the electromagnetic coil. The end of the expansion and contraction block 21 near the connector 12 has a protrusion. Through the end of the pressing member 32 near the connector 12 and the protrusion at the end of the expansion and contraction block 21 away from the pressing member 32, the winding width of the electromagnetic coil can be limited to ensure that the required winding width meets the usage requirements. It should be noted that the outer diameter formed by the expansion and contraction block 21 in this embodiment, i.e., the winding diameter, refers to the diameter formed by the end of the expansion and contraction block 21 used to wind the electromagnetic coil. The winding diameter is smaller than the limiting diameter formed by the protrusion. The pressing member 32 has a surrounding plate on its outer periphery, which can limit the outer periphery of the conical member 31, allowing the pushing plane part 312 to move axially within the inner periphery of the surrounding plate, improving the positioning effect.

[0043] The pushing plane 312 has multiple first clearance portions 3121 circumferentially arranged, and the pressing member 32 has multiple second clearance portions 322 circumferentially arranged. The first clearance portions 3121 and the second clearance portions 322 correspond one-to-one and are both through-slot structures. The first clearance portion 3121 is correspondingly provided with a fitting gap 23 between it and two adjacent expansion blocks 21, and is used to pass through a fastening member (not shown in the figure). The fastening member can be insulating electrical tape, used to fasten the electromagnetic coil. The pushing assembly 3 also includes two positioning members 34, which can be positioning pins, and the material can be copper. The pushing flat part 312 is provided with two first strip holes 3122, the pressing part 32 is provided with two second strip holes 323, and the positioning part 34, the first strip holes 3122 and the second strip holes 323 are all correspondingly arranged. At least two expansion blocks 21 are provided with positioning holes 211. In this embodiment, the two expansion blocks 21 are provided with positioning holes 211, and the positioning holes 211 correspond to the positioning part 34. One end of the positioning part 34 is connected to the positioning hole 211, and the other end of the positioning part 34 passes through the corresponding second strip hole 323 and the first strip hole 3122 and can move in the strip hole to restrict the relative rotation between the conical part 31, the pressing part 32 and the expansion block 21, while not affecting the adjustment of the winding diameter, so that the first clearance part 3121, the second clearance part 322 and the mating gap 23 are aligned in pairs. This can ensure that the tightening part can accurately pass through the corresponding part to tighten the electromagnetic coil. Furthermore, the diameter of the connector 12 can be set as needed to reduce the risk of interference when the fastening element is inserted, while ensuring the supporting effect on the expansion and contraction block 21.

[0044] like Figure 1 , Figure 2 and Figure 3 As shown, the second end of the central shaft 11 has an external thread (not shown in the figure). The nut 4 is screwed onto the second end of the central shaft 11. The nut 4 is located on the side of the tapered member 31 away from the connecting member 12. The nut 4 can be a common hexagonal nut, and the material can be carbon steel. The nut 4 is used to push the second end of the tapered member 31 and the pushing plane 312, so that the tapered member 31 can move towards the connecting member 12. By setting the direction of rotation, when the nut 4 is rotated clockwise, the nut 4 moves towards the connecting member 12 along the axis of the central shaft 11, pushing the tapered member 31 to also move towards the connecting member 12. Since the tapered part 311 cooperates with the conical surface 212 of the expansion and contraction block 21, the expansion and contraction block 21 will relatively separate, and the diameter around it will increase. Figure 4 The diagram shows the state with the largest winding diameter. When the nut 4 is rotated counterclockwise, the nut 4 moves away from the connector 12, and the tapered member 31 also moves away from the connector 12 under the action of the annular elastic member 22. The expansion and contraction blocks 21 move closer to each other, and the winding diameter decreases, as shown in the diagram. Figure 5 The diagram shows the minimum diameter of the winding.

[0045] Understandably, the frame also includes necessary structures for connection, support, drive, positioning, limiting and control functions to enable the frame to operate normally; the shape, size, material and number of each part of the frame can be determined as needed to achieve the corresponding functions.

[0046] The implementation principle of this embodiment is as follows: The electromagnetic coil frame with expandable and contractible diameter is connected to the winding machine through the central component 1. According to the actual required diameter, the tapered component 31 is moved axially by rotating the nut component 4, thereby changing the outer diameter formed by multiple expansion and contraction blocks 21. When it is necessary to wind the electromagnetic coil, the nut component 4 is rotated clockwise to increase the outer diameter of the expansion and contraction blocks 21. After reaching the required diameter, the coil is wound according to the required number of turns. After winding, the positioning component 34 positions the clearance part of the pushing plane part 312 and the pressing part 32. The clearance part and the fitting gap 23 pass through the inner diameter of the coil and the clamping part to tighten the coil. Then, the nut component 4 is rotated counterclockwise until the tapered component 31 and the pressing part 32 are disengaged from the central shaft 11 and removed. At the same time, the outer diameter formed by the expansion and contraction blocks 21 is reduced, thereby allowing the coil to be easily removed. This design can adapt to the winding of electromagnetic coils of different diameters, increasing product diversity, reducing product development costs, and solving the problem that traditional frames cannot meet the manufacturing requirements of electromagnetic coils with large electromagnetic force and large diameter that need to be placed in a U-shaped outer casing groove.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electromagnetic coil frame with an expandable and contractible diameter, characterized in that, include: A central assembly (1) includes a central shaft (11) and a connector (12). The first end of the central shaft (11) is connected to the center of the connector (12). The axis of the central shaft (11) is collinear with the axis of the connector (12). The connector (12) is used to connect to a winding machine. The expansion and contraction assembly (2) includes multiple expansion and contraction blocks (21) and an annular elastic element (22). The expansion and contraction blocks (21) are distributed around the central axis (11) in the circumferential direction. The expansion and contraction blocks (21) are slidably connected to the connector (12). The annular elastic element (22) surrounds the multiple expansion and contraction blocks (21) and is used to drive the multiple expansion and contraction blocks (21) to move closer to each other. An electromagnetic coil is used to be wound around the outer periphery of the expansion and contraction blocks (21). A pushing component (3) includes a conical component (31). The diameter of the first end of the conical component (31) is smaller than the diameter of the second end of the conical component (31). The conical component (31) slides through the central shaft (11), and the first end of the conical component (31) is located on the side of the second end of the conical component (31) close to the connector (12). The outer periphery of the conical component (31) cooperates with a plurality of expansion and contraction blocks (21). The movement of the conical component (31) along the axial direction of the central shaft (11) is used to separate or bring the plurality of expansion and contraction blocks (21) relative to each other, so as to selectively support and be used for winding an electromagnetic coil or unwinding a wound electromagnetic coil. Nut (4) is screwed to the second end of the central shaft (11). The nut (4) is located on the side of the tapered member (31) away from the connector (12). The nut (4) is used to push the second end of the tapered member (31) so that the tapered member (31) can move closer to the connector (12).

2. The electromagnetic coil frame with expandable and contractible diameter according to claim 1, characterized in that, The conical member (31) includes a conical portion (311) and a pushing plane portion (312). The diameter of the first end of the conical portion (311) is smaller than the diameter of the second end of the conical portion (311). The second end of the conical portion (311) is connected to the pushing plane portion (312). The outer periphery of the conical portion (311) cooperates with the side of the plurality of expansion and contraction blocks (21) near the central axis (11). The first end of the conical portion (311) is used to extend between the plurality of expansion and contraction blocks (21).

3. The electromagnetic coil frame with expandable and contractible diameter according to claim 2, characterized in that, The pushing assembly (3) includes a pressing member (32) and a plurality of tightening members (33). The pressing member (32) has a through hole (321) in the center. The pressing member (32) slides through the central shaft (11). The tapered part (311) passes through the through hole (321) of the pressing member (32). The pushing plane part (312) is located on the side of the pressing member (32) away from the expansion block (21). The plurality of tightening members (33) are distributed on the pushing plane part (312). The tightening members (33) are screwed to the pushing plane part (312). The tightening members (33) are used to tighten the pressing member (32) so that the pressing member (32) fits against the side of the expansion block (21) away from the connector (12).

4. The electromagnetic coil frame with expandable and contractible diameter according to claim 3, characterized in that, The pushing plane (312) is provided with a plurality of first clearance portions (3121), and the pressing member (32) is provided with a plurality of second clearance portions (322). The first clearance portions (3121) and the second clearance portions (322) correspond one-to-one. The first clearance portion (3121) is provided with a corresponding fit gap (23) between the first clearance portion (3121) and the two adjacent expansion blocks (21). The first clearance portion (3121), the second clearance portion (322) and the fit gap (23) are used to pass through the fastening member, which is used to fasten the electromagnetic coil.

5. The electromagnetic coil frame with expandable and contractible diameter according to claim 4, characterized in that, The pushing component (3) includes two positioning members (34), the pushing plane (312) is provided with two first strip holes (3122), and the pressing member (32) is provided with two second strip holes (323). The positioning member (34), the first strip hole (3122) and the second strip hole (323) are all correspondingly arranged. At least two of the expansion and contraction blocks (21) are provided with positioning holes (211). The positioning holes (211) correspond to the positioning members (34). One end of the positioning member (34) is connected to the positioning hole (211), and the other end of the positioning member (34) passes through the corresponding second strip hole (323) and the first strip hole (3122), so that the first clearance part (3121), the second clearance part (322) and the mating gap (23) are aligned in pairs.

6. The electromagnetic coil frame with expandable and contractible diameter according to claim 1, characterized in that, The expansion block (21) has a conical surface (212) on the side near the central axis (11), and the conical surface (212) is used to slide with the outer periphery of the conical part (311).

7. The electromagnetic coil frame with expandable and contractible diameter according to claim 1, characterized in that, The expansion and contraction block (21) is fan-shaped.

8. The electromagnetic coil frame with expandable and contractible diameter according to claim 1, characterized in that, The expansion and contraction block (21) is provided with a mounting groove (213), the mounting groove (213) has an arc, and the annular elastic element (22) is provided in the mounting groove (213) of the plurality of expansion and contraction blocks (21).

9. The electromagnetic coil frame with expandable and contractible diameter according to claim 1, characterized in that, The connector (12) is provided with a plurality of sliding grooves (121), which are radially distributed around the central axis (11). The expansion block (21) is provided with a slider (214), which is provided in a one-to-one correspondence with the sliding groove (121) and is slidably connected to the sliding groove (121).

10. The electromagnetic coil frame with expandable and contractible diameter according to claim 9, characterized in that, Both the groove (121) and the slider (214) have T-shaped cross sections.

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