Coil winding device for mutual inductor production

Abstract

The invention relates to the technical field of mutual inductor production, in particular to a coil winding device for mutual inductor production. The coil winding device comprises a rack and a winding wheel, the winding wheel is rotationally supported on the rack through a plurality of supporting wheels, the winding wheel is provided with a C-shaped notch used for containing an iron core, and the winding wheel comprises a middle ring and side rings located on the two sides of the middle ring; the side rings and the middle ring are coaxial and are arranged in a mutually rotating mode, the circumferential wall of the middle ring is used for winding a copper wire, and one side ring is provided with a wire penetrating ring used for penetrating the end of the copper wire. The tensioning assembly is used for clamping the copper wire between the iron core and the threading ring; the magnetic powder brake is connected to the supporting wheel and provides resistance for the middle ring through the supporting wheel so as to tension the copper wire; and the driving assembly is used for driving the side ring to rotate and winding the copper wire on the iron core. Resistance is provided by the magnetic powder brake through the middle ring of the reel, so that tensioning of a copper wire can be controlled, and the winding quality of the copper wire on an iron core is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformer production, and particularly relates to a coil winding device for current transformer production. Background Art

[0002] A current transformer is an electrical instrument based on the principle of electromagnetic induction, mainly composed of a closed iron core and windings, and is used to measure current. When the current transformer is working, its secondary side circuit is always closed, and the working state is close to a short circuit to ensure the safe operation of measuring instruments and protection circuits. In the production process of current transformers, the winding of coils is a crucial link. Since current transformers have high requirements for accuracy and stability, various parameters need to be strictly controlled during the coil winding process, such as the number of winding turns, winding tension, and winding speed.

[0003] The Chinese patent document with the authorization announcement number CN118609991B discloses a current transformer coil winding device, including a base and a fixing plate. The outer wall of the fixing plate and the base are an integral body. A motor is installed on one outer wall of the fixing plate, and a first grooved shaft and a second grooved shaft are respectively installed on the inner wall of the fixing plate. A transmission belt is installed on the inner walls of the first grooved shaft and the second grooved shaft. An installation frame is fixedly connected to the upper end of the fixing plate. A rotating shaft is fixedly connected to one outer wall of the installation frame, and a roller is provided on the outer wall of the rotating shaft. Two half-ring plates are installed between the transmission belt and the roller. The two half-ring plates are connected and fixed by bolts and fixing pieces. The two half-ring plates are located inside the installation frame. A clamping arm is installed at one end of the installation frame. The two half-ring plates are rotatably arranged on the clamping arm to limit the movement position of the half-ring plates. A notch is opened on the inner wall of one of the half-ring plates, and slots are opened on the inner walls of the two sides of the half-ring plate close to the notch. Plug pins are provided on the inner walls of the slots, and a wire reel is installed between the two plug pins.

[0004] The wire reel has been pre-wound with copper wire. Then, the two half-ring plates are combined and passed through from both sides of the iron core to the middle of the iron core. Next, one end of the copper wire is wound around the iron core, and then the half-ring plate is rotated. As the half-ring plate rotates, the wire reel installed on it will also rotate accordingly, driving the copper wire to wind around the iron core. However, when the copper wire is being wound, it will be loose or tight due to different pulling forces. Especially, the wire reel cannot rotate evenly around the iron core, so the rotation speed of the wire reel will be sometimes fast and sometimes slow, further reducing the winding quality of the copper wire. Summary of the Invention

[0005] The present invention provides a coil winding device for current transformer production, aiming to solve the problem of poor winding quality caused by the difficulty in controlling the pulling force of copper wire during the winding process in related technologies.

[0006] A coil winding device for the production of transformers according to the present invention includes a frame, and further includes: a winding wheel, which is rotatably supported on the frame by a plurality of support wheels, and the winding wheel has a C-shaped notch for placing an iron core. The winding wheel includes a middle ring and side rings located on both sides of the middle ring. The side rings are coaxial with the middle ring and are rotatably arranged relative to each other. The circumferential wall of the middle ring is used for winding copper wires, and a wire threading ring for threading the end of the copper wire is arranged on one side ring; a tensioning assembly, which is used to clamp the copper wire between the iron core and the wire threading ring; a magnetic powder brake, which is connected to the support wheel and provides resistance to the middle ring through the support wheel to tension the copper wire; a driving assembly, which is used to drive the side ring to rotate and wind the copper wire around the iron core.

[0007] The effect is as follows: The winding wheel rotates and is supported on the frame by a plurality of support wheels. First, several turns of copper wire are wound on the winding wheel so as to be transferred to the iron core later. The winding wheel has a C-shaped notch, which enables the iron core to be conveniently placed at a position convenient for winding without opening the main structure of the winding wheel. The winding wheel includes a middle ring and side rings, and the copper wire is wound on the circumferential wall of the middle ring. A wire threading ring is installed on the side ring. When the side ring rotates under the action of the driving assembly, the copper wire will also be driven by the wire threading ring. At this time, the copper wire will pull the middle ring to rotate. Since the magnetic powder brake provides resistance to the middle ring, the copper wire has a certain tension under the action of the magnetic powder brake. In this way, during the rotation of the winding wheel, the copper wire will gradually be wound around the iron core. At the same time, the middle ring also rotates relative to the side ring, so that the copper wire on the middle ring is gradually released. The resistance provided by the magnetic powder brake keeps the copper wire taut and controls the tension, thereby improving the winding quality.

[0008] Preferably, a sliding groove is formed on the surface of the side ring close to the middle ring. The cross-section of the sliding groove is T-shaped and the sliding groove is arranged along the arc direction of the side ring. A guiding ring is arranged in the sliding groove. The guiding ring is fixed to the middle ring by bolts. The guiding ring is formed by splicing a plurality of arc-shaped structures, and the length of each arc-shaped structure is less than the C-shaped opening length of the side ring.

[0009] The effect is as follows: A sliding groove is formed on the side ring, and a guiding ring formed by splicing a plurality of arc-shaped structures is arranged inside the sliding groove. During installation, each arc-shaped structure can be gradually fixed to the middle ring by bolts, and while connecting each arc-shaped structure, the side ring is also connected to the guiding ring, thereby facilitating the installation of the side ring to the middle ring.

[0010] Preferably, ribs are arranged on the inner circumferential wall of the middle ring, and an annular groove is formed on the circumferential wall of the support wheel. The ribs are supported in the annular groove.

[0011] Preferably, a through hole is formed at the position of the edge of the winding wheel corresponding to the wire threading ring. A detachable guiding block is arranged in the through hole. One end of the guiding block close to the wire threading ring is set to be V-shaped. The guiding block is inserted into the through hole and pushes the copper wire into the wire threading ring.

[0012] Its effect is that when it is necessary to wind the copper wire around the winding wheel, the detachable guiding block can be removed. Then, when the winding length reaches the appropriate value, the guiding block is inserted through the through hole, and the guiding block can guide the end of the copper wire into the wire threading ring, thus facilitating the arrangement of the copper wire so as to wind the copper wire around the iron core subsequently.

[0013] Preferably, the driving assembly includes two gear sets for driving the side rings to rotate, a synchronization assembly is arranged between the two gear sets, the synchronization assembly is used to make the two gear sets rotate synchronously, and the distance between the two gear sets is greater than the width of the C-shaped opening of the winding wheel.

[0014] Its effect is that a synchronization assembly is arranged between the two gear sets, and both of these two gear sets are connected to the winding wheel, so as to ensure that any one of the gear sets in the driving assembly can drive the winding wheel. This design ensures that the winding wheel with a C-shaped opening can rotate circumferentially, and the two gear sets always remain in a synchronous state, so as to be more accurate when one of the two gear sets initially meshes with the winding wheel.

[0015] Preferably, another synchronization assembly is arranged between at least two of the supporting wheels, and a transmission assembly is arranged between a supporting wheel connected to the synchronization assembly and the gear set; when the copper wire is wound around the winding wheel, the driving assembly drives the middle ring and the side rings to rotate simultaneously through the transmission assembly.

[0016] Preferably, the transmission assembly includes a first transmission gear, a second transmission gear, a transmission belt and a one-way bearing. The first transmission gear is coaxially fixed on the gear set, the second transmission gear is coaxially arranged on the supporting wheel through the one-way bearing, the transmission belt is in transmission connection between the first transmission gear and the second transmission gear, and the transmission ratio of the first transmission gear and the second transmission gear is used to make the middle ring and the side rings rotate at the same speed when winding the copper wire.

[0017] Its effect is that when it is necessary to wind the copper wire around the middle ring, the driving assembly drives the supporting wheel to rotate through the first transmission gear, the second transmission gear, the transmission belt and the one-way bearing, and the supporting wheel then drives the middle ring to rotate. At this time, the driving assembly also drives the side rings to rotate synchronously, so that the middle ring and the side rings can rotate simultaneously at the same speed. Such a design can reduce the friction between the copper wire and the winding wheel during the winding process, thereby reducing the risk of damage to the copper wire. When the driving motor rotates in the reverse direction, due to the setting of the one-way bearing, the driving assembly will not drive the middle ring to rotate through the transmission assembly. At this time, the middle ring can provide resistance under the action of the magnetic powder brake to tension the copper wire.

[0018] Preferably, the gear set includes two coaxially fixed driving gears, and a tooth ring is coaxially fixed on the side ring, and the tooth rings on the two side rings are respectively meshed with the two driving gears in one-to-one correspondence.

[0019] The effect is that the gear set includes two driving gears, which respectively correspond to the toothed rings on the two side rings, so that the two completely separated side rings can achieve synchronous rotation.

[0020] Preferably, the tensioning assembly includes two opposite clamping plates. The surfaces of the clamping plates close to each other are arc-shaped surfaces. The plane between the two clamping plates is aligned with the side of the winding wheel where the wire threading ring is provided. An installation plate is provided at a position corresponding to one of the clamping plates, and a plurality of springs are provided between the installation plate and the clamping plate.

[0021] The effect is that the sides of the clamping plates close to each other are arc-shaped surfaces. In this way, the copper wire can more easily enter between the two clamping plates during the winding process. At the same time, the copper wire is clamped by the springs provided between the installation plate and the clamping plate, and the tension provided by the magnetic powder brake for the copper wire is combined to ensure the winding quality of the copper wire.

[0022] Preferably, an installation assembly is provided on the frame. The installation assembly includes a moving seat and three rubber wheels installed on the moving seat. The distance between the three rubber wheels is adjusted to place iron cores of different sizes. The moving seat is slidably connected to the frame, and the position of the moving seat is adjusted so that the winding wheel passes through the middle of the iron core.

[0023] The effect is that the distance between the three rubber wheels can be adjusted, so as to facilitate the installation of iron cores of different sizes on the installation assembly to meet the production requirements of different coils.

[0024] With the above technical solutions, the beneficial effects of the present invention are: In the present invention, a wire threading ring is installed on the side ring. When the side ring rotates under the action of the driving assembly, the copper wire will also be driven by the wire threading ring. The magnetic powder brake provides resistance to the middle ring, and the copper wire has a certain tension under the action of the magnetic powder brake. In this way, during the rotation of the winding wheel, the copper wire will gradually be wound around the iron core. At the same time, the middle ring also rotates relative to the side ring, causing the copper wire on the middle ring to be gradually released. The resistance provided by the magnetic powder brake keeps the copper wire taut, thereby improving the winding quality. Both gear sets are connected to the winding wheel, ensuring that any gear set in the driving assembly can drive the winding wheel, guaranteeing that the winding wheel with a C-shaped opening can rotate circumferentially. The driving assembly also drives the side ring to rotate synchronously, enabling the middle ring and the side ring to rotate simultaneously at the same speed, which can reduce the friction between the copper wire and the winding wheel during the winding process, thereby reducing the risk of damage to the copper wire. When the driving motor rotates in the reverse direction, due to the setting of the one-way bearing, the driving assembly will not drive the middle ring to rotate through the transmission assembly. At this time, the middle ring can provide resistance under the action of the magnetic powder brake to tension the copper wire. By using the forward and reverse rotations of the driving motor, the copper wire can be wound on the winding wheel or transferred to the iron core. The distance between the three rubber wheels can be adjusted, facilitating the installation of iron cores of different sizes on the installation assembly to meet the production requirements of different coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall structural schematic diagram of a coil winding device for producing mutual inductors according to the present invention; Figure 2 is the schematic diagram of the arrangement position of the supporting wheels in the embodiment of the present invention; Figure 3 is the structural schematic diagram of the winding wheel in the embodiment of the present invention; Figure 4 is Figure 1 the partial enlarged view of part A in Figure 5 is the schematic diagram of the assembly process of the winding wheel in the embodiment of the present invention; Figure 6 is the schematic diagram of the installation position of the driving motor in the embodiment of the present invention; Figure 7 is the structural schematic diagram of the driving assembly in the embodiment of the present invention; Figure 8 is the structural schematic diagram of the tensioning assembly in the embodiment of the present invention.

[0026] Reference Signs: 1. Frame; 2. Wire winding wheel; 21. Middle ring; 22. Side ring; 221. Threading ring; 222. Through hole; 23. U-shaped wire groove; 24. Slide groove; 25. Guide ring; 26. Inner convex strip; 27. Rib; 28. Guide block; 29. Through groove; 3. Mounting assembly; 31. Moving seat; 32. Rubber wheel; 33. Connecting rod; 34. Vertical rod; 35. Hand wheel; 36. Slide rail; 41. Gear set; 411. Driving gear; 42. Synchronization assembly; 43. Driving motor; 44. Magnetic powder brake; 45. Transmission assembly; 451. First transmission gear; 452. Second transmission gear; 453. Transmission belt; 454. One-way bearing; 46. Bearing sleeve; 47. Wheel cover; 48. Tooth ring; 5. Tensioning assembly; 51. Clamping plate; 52. Mounting plate; 53. Spring; 6. Support wheel; 61. Annular groove; 7. Iron core; 8. Driving part. Detailed implementation manners

[0027] The following combines Figures 1 to 8 to describe the embodiments of the present invention in detail. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0028] This embodiment discloses a coil winding device for the production of mutual inductors. As Figure 1 and Figure 2 shown, the device includes a frame 1, a wire winding wheel 2, a mounting assembly 3, a driving assembly, and a tensioning assembly 5. The wire winding wheel 2 is rotationally supported on the frame 1 by a plurality of support wheels 6, and the rotation axis of the wire winding wheel 2 is horizontally arranged. The plurality of support wheels 6 are connected to the frame 1 on one side of the wire winding wheel 2, and the other side is suspended so as to wind the copper wire at one end of the wire winding wheel 2 away from the frame 1. The mounting assembly 3 is arranged at the horizontal position of the frame 1 for mounting the iron core 7. The driving assembly is used to drive the wire winding wheel 2 to rotate so as to wind the copper wire on the wire winding wheel 2 or wind the copper wire on the wire winding wheel 2 onto the iron core 7.

[0029] Refer to Figure 3 and Figure 4, the winding wheel 2 is composed of a middle ring 21 and two side rings 22. Both the middle ring 21 and the side rings 22 are in a C shape. The two side faces of the middle ring 21 are used to install the side rings 22. The outer diameter of the side rings 22 is larger than that of the middle ring 21, so that when the two side rings 22 are respectively installed on both sides of the middle ring 21, they will extend beyond the outer periphery of the middle ring 21, thus forming a U-shaped wire groove 23 on the winding wheel 2 for winding copper wires. A chute 24 is opened on the side wall of the side ring 22 close to the middle ring 21, and the cross-section of the chute 24 is T-shaped. A guiding ring 25 is installed in the chute 24. The guiding ring 25 is also annular and is fixed on the side wall of the middle ring 21 by bolts. The function of the guiding ring 25 is to connect the side ring 22 and the middle ring 21, ensure that the centers of the side ring 22 and the middle ring 21 coincide, and at the same time allow relative rotation between the side ring 22 and the middle ring 21.

[0030] When the copper wire is wound onto the winding wheel 2, the side ring 22 and the middle ring 21 will rotate simultaneously, which can reduce the friction between the copper wire and the side ring 22. When the copper wire needs to be transferred from the winding wheel 2 to the iron core 7, the middle ring 21 will rotate relative to the side ring 22 to release the copper wire wound on the middle ring 21 before. In order to ensure that the copper wire can be in the middle position of the side wall of the middle ring 21 when it is wound onto the winding wheel 2, thereby reducing the situation where the copper wire is close to the opposite side walls of the two side rings 22, inner convex strips 26 are fixedly arranged on the opposite side walls of the two side rings 22. The inner convex strips 26 are arranged along the edge of the side ring 22, and their cross-section is triangular and extends towards the middle of the two side rings 22. The copper wire will be restricted by the inner convex strips 26 during the winding process and thus be guided to the middle position of the middle ring 21. Ribs 27 are also provided on the annular inner wall of the middle ring 21, and the supporting wheel 6 supports the winding wheel 2 through the ribs 27.

[0031] Reference Figure 5 , when assembling the winding wheel 2, the guiding ring 25 is in a C shape formed by splicing multiple arc-shaped structures. The arc-shaped structures of the guiding ring 25 should be fixed on the middle ring 21 one by one through bolts, and the side ring 22 should be rotated along the guiding ring 25 each time an arc-shaped structure is installed until the installation of the guiding ring 25 is completed. The length of each arc-shaped structure of the guiding ring 25 is less than the C-shaped opening length of the side ring 22.

[0032] Reference Figure 3 and Figure 4, a threading ring 221 is fixedly installed on the edge of the winding wheel 2. The threading ring 221 is located on the side of the winding wheel 2 away from the frame 1 and is used to pass one end of the copper wire through the threading ring 221. The threading ring 221 is made of a magnetic material and can be a magnet. Through holes 222 are formed in the edges of the two side rings 22 of the winding wheel 2. One end of the through hole 222 is blocked by the threading ring 221, and the other end is provided in a through manner. A guiding block 28 is arranged in the through hole 222. The guiding block 28 is made of an iron-containing material. One end of the guiding block 28 close to the threading ring 221 is arranged in a V-shaped structure. When the length of the copper wire wound on the winding wheel 2 is sufficient for winding one coil, the guiding block 28 is inserted into the through hole 222, and the V-shaped end of the guiding block 28 pushes the copper wire to the threading ring 221. There is a notch at the connection position of the threading ring 221 and the through hole 222, which allows the guiding block 28 to enter the threading ring 221 and be held in the through hole 222 due to magnetic attraction. In order to enable the copper wire to enter the threading ring 221 under the push of the guiding block 28 without being cut off, the edge of the through hole 222 is opened to form a through groove 29 on the side ring 22 where the threading ring 221 is installed. The copper wire can reach one side of the winding wheel 2 from the middle of the winding wheel 2 at the position of the through groove 29, so as to wind the copper wire around the iron core 7 subsequently. After the copper wire is guided to the threading ring 221, the copper wire is cut off so that the free end of the copper wire can be wound around the iron core 7. Then, when the winding wheel 2 is rotated, the threading ring 221 rotates with the winding wheel 2 at the same time, and the copper wire can be continuously wound around the iron core 7 to form a coil.

[0033] A driving member 8 for taking out the guiding block 28 is fixedly arranged on the frame 1. The driving member 8 can use an electromagnet and an electric cylinder in cooperation. The suction force generated after the electromagnet is energized is greater than the magnetic force of the threading ring 221 on the guiding block 28. The electric cylinder moves the electromagnet closer to or away from the guiding block 28 so that the suction force generated after the electromagnet is energized can suck the guiding block 28, enabling the guiding block 28 to be removed from the through hole 222. In this way, the copper wire can be wound around the winding wheel 2 again, facilitating the winding of the next coil. To facilitate the attraction of the electromagnet to the guiding block 28, a sensor for detecting the position of the winding wheel 2 is fixedly arranged on the frame 1 so that when the winding wheel 2 stops rotating, the position of the driving member 8 corresponds to the guiding block 28.

[0034] Reference Figure 6 and Figure 7The driving assembly includes two gear sets 41 for driving the side ring 22 to rotate, and a synchronization assembly 42 is arranged between the two gear sets 41, and the synchronization assembly 42 is used to make the two gear sets 41 rotate synchronously. The two gear sets 41 are respectively connected to two different parts of the winding wheel 2, and the spacing between the two gear sets 41 is greater than the width of the C-shaped opening of the winding wheel 2. In this way, when the winding wheel 2 rotates, at least one gear set 41 can drive the side ring 22. When the two gear sets 41 drive the side ring 22 at the same time, the normal rotation of the side ring 22 can be guaranteed due to the synchronization effect of the synchronization assembly 42. A driving motor 43 is connected to one of the gear sets 41, and the driving motor 43 can be a servo motor. The driving motor 43 can drive the winding wheel 2 to rotate by forward or reverse rotation, so as to wind the copper wire on the winding wheel 2 or transfer the copper wire to the iron core 7.

[0035] Another synchronization component 42 is arranged between at least two support wheels 6, and the synchronization component 42 adopts the structure of synchronization gear and synchronization belt. The support wheel 6 connected with the synchronization component 42 is used to drive the middle ring 21, and the gear set 41 is used to drive the side ring 22. When the middle ring 21 and the side ring 22 need to rotate simultaneously, the driving component will simultaneously drive the two support wheels 6 connected with the synchronization component 42 and the two gear sets 41. A magnetic powder brake 44 is installed on one of the support wheels 6 connected with the synchronization component 42, and the magnetic powder brake 44 is used to provide resistance to the rotation of the middle ring 21 when the copper wire is transferred to the iron core 7, so as to keep the copper wire in tension. When the power is not turned on, the magnetic powder brake 44 will not produce resistance to the operation of the middle ring 21.

[0036] A transmission assembly 45 is arranged between a gear set 41 and a support wheel 6 connected to a synchronization assembly 42, and the transmission assembly 45 includes a transmission gear 1 451, a transmission gear 2 452, a transmission belt 453 and a one-way bearing 454. The transmission gear 1 451 is coaxially fixed on the gear set 41, the transmission gear 2 452 is coaxially arranged on the support wheel 6 through the one-way bearing 454, and the transmission belt 453 is transmission-connected between the transmission gear 1 451 and the transmission gear 2 452. When the middle ring 21 and the side ring 22 need to rotate at the same time, the transmission gear 2 452 can drive the support wheel 6 to rotate through the one-way bearing 454, and the copper wire begins to be wound on the winding wheel 2; when the copper wire needs to be transferred to the iron core 7, the driving motor 43 rotates in the opposite direction, and the transmission gear 2 452 cannot drive the support wheel 6 due to the action of the one-way bearing 454, and the copper wire will drive the middle ring 21 to rotate during the transfer process, and the middle ring 21 is also subject to the resistance provided by the magnetic powder brake 44, so that the copper wire is kept in a tensioned state.

[0037] Continue to refer Figure 6 and Figure 7, both the gear set 41 and the support wheel 6 are mounted on the frame 1 through bearing sleeves 46. A wheel cover 47 is also fixedly arranged on the frame 1. The wheel cover 47 is used to cover the transmission assembly 45 and the synchronization assembly 42, playing a protective role, and the drive motor 43 and the magnetic powder brake 44 can be fixed on the wheel cover 47. The gear set 41 includes two coaxially fixed drive gears 411. Referring to Figure 5 , a toothed ring 48 is coaxially and fixedly arranged on the side ring 22. The toothed ring 48 is in a C shape. The toothed rings 48 on the two side rings 22 are respectively engaged with the two drive gears 411 in a one-to-one correspondence, so that the gear set 41 can drive the two side rings 22 to rotate simultaneously. An annular groove 61 is formed in the side wall of the support wheel 6. The rib 27 is supported in the annular groove 61. The support wheel 6 is made of rubber material. The support wheel 6 has greater friction with the rib 27 to ensure the drive of the support wheel 6 on the middle ring 21.

[0038] Reference Figure 8 , the tensioning assembly 5 includes two opposite clamping plates 51. The surfaces of the clamping plates 51 facing each other are arc-shaped and fixedly cover the fabric. The fabric can be selected as flexible cotton cloth to reduce damage to the copper wire and provide friction for the copper wire at the same time. The positions of the two clamping plates 51 opposite to each other are aligned with the side of the winding wheel 2 away from the frame 1. When the copper wire is transferred to the iron core 7, the copper wire will pass between the two clamping plates 51, and the tension is maintained by the friction of the clamping plates 51 on the copper wire. During use, the copper wire is wound around the iron core 7 for one circle, and the copper wire is tensioned at least once through the magnetic powder brake 44 to keep the copper wire in a tensioned state. In this embodiment, the position of each tensioning of the copper wire can be on the side of the winding wheel 2 away from the installation position of the iron core 7. An installation plate 52 is fixedly arranged on the frame 1. The installation plate 52 is arranged parallel to the clamping plate 51 away from the frame 1, and a plurality of springs 53 are arranged between the installation plate 52 and the clamping plate 51 away from the frame 1. The plurality of springs 53 are arranged at intervals. A stud is inserted through each spring 53. One end of the stud is fixed on the clamping plate 51, and the other end passes through the installation plate 52 and is threadedly connected with a nut. The elastic force of the spring 53 on the clamping plate 51 can be adjusted through the nut.

[0039] Reference Figure 1, the installation component 3 includes a moving seat 31 and three rubber wheels 32. The axes of the three rubber wheels 32 are vertically arranged, and one of the rubber wheels 32 is connected to a power source for driving its rotation. The power source can be a servo motor, which is installed inside the moving seat 31 and fixedly connected to the moving seat 31. The other two rubber wheels 32 are both connected by a connecting rod 33. One end of the connecting rod 33 is used for rotatably installing the rubber wheel 32, and the other end is fixedly provided with a vertical rod 34. The vertical rod 34 is rotatably arranged on the moving seat 31 and is driven by a worm and gear structure inside the moving seat 31, so that the distance between the two rubber wheels 32 can be adjusted to adapt to iron cores 7 of different sizes. When the iron core 7 is placed between the three rubber wheels 32, the power source can drive the rubber wheels 32 to drive the iron core 7 to rotate, so as to evenly wind the copper wire around the iron core 7. A horizontal slide rail 36 is fixedly arranged on the frame 1, and the moving seat 31 is slidably connected to the slide rail 36. In addition, a handwheel 35 is rotatably arranged on the moving seat 31. By rotating the handwheel 35, the screw rod installed inside the moving seat 31 can be driven to rotate. The screw rod is connected to the frame 1, so the rotation of the screw rod can drive the moving seat 31 to move along the slide rail 36, thereby adjusting the central position of the iron core 7 to ensure that the position of the iron core 7 is convenient for the threading of the winding wheel 2.

[0040] The working process of this embodiment is as follows: The process of winding the copper wire on the winding wheel 2: First, place the iron core 7 on the installation component 3 and ensure that the center of the iron core 7 is directly opposite to the winding wheel 2 by adjusting the positions of the three rubber wheels 32. The iron core 7 can be directly placed in the C-shaped notch of the winding wheel 2. Subsequently, fix one end of the copper wire on the outer peripheral wall of the middle ring 21, and the fixing method can be pasting with tape or using a hook for fixing. After starting the driving motor 43, the driving motor 43 drives the two support wheels 6 to rotate through the transmission component 45. The transmission ratio of the transmission component 45 is designed so that the rotation speeds of the middle ring 21 and the side ring 22 are kept consistent. At the same time, the two gear sets 41 also rotate under the action of the driving motor 43 to drive the side ring 22 to rotate. In this way, the copper wire will be wound along the outer peripheral wall of the middle ring 21 until it stops after reaching the length required for one coil. At this time, manually insert the guiding block 28 into the through hole 222. Under the action of the guiding block 28, guide the end of the copper wire into the wire threading ring 221, and the end of the copper wire can be cut at the wire threading ring 221 for subsequent winding onto the iron core 7.

[0041] Process of transferring the copper wire from the wire reel 2 to the iron core 7: Start winding the copper wire on the iron core 7 from the end that passes through the wire threading loop 221. At this time, the driving motor 43 rotates in the opposite direction. Since the one-way bearing 454 is provided in the transmission assembly 45, the driving motor 43 only drives the side ring 22 to rotate. When the side ring 22 rotates, the end of the copper wire moves with the rotation of the wire threading loop 221, and thus the copper wire pulls the middle ring 21 to rotate. The magnetic powder brake 44 provides the necessary tension for the copper wire. When the copper wire passes between the two clamping plates 51, it is clamped by the clamping plates 51, and the clamping plates 51 provide the tension. When the copper wire winds around the iron core 7 for one circle, the magnetic powder brake 44 provides resistance to ensure the tension state of the copper wire, so that it can be wound tightly and evenly on the iron core 7.

[0042] In other embodiments, the mounting assembly 3 may not be provided, and the iron core can be held by hand for winding. In other embodiments, each of the two clamping plates 51 in the tensioning assembly 5 is correspondingly provided with a mounting plate 52, and the two clamping plates 51 are respectively connected to the corresponding mounting plates 52 by springs 53, so that both of the two clamping plates 51 can provide clamping force. In other embodiments, the driving member 8 can also use a manipulator to clamp and guide the guide block 28, so that the guide block 28 enters or is taken out of the through hole 222.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A coil winding device for the production of mutual inductors, comprising a frame (1), characterized in that, It further includes: A winding wheel (2), which is rotatably supported on a frame (1) by a plurality of support wheels (6). The winding wheel (2) has a C-shaped notch for placing an iron core (7). The winding wheel (2) includes a middle ring (21) and side rings (22) located on both sides of the middle ring (21). The side rings (22) are coaxial with the middle ring (21) and are rotatably arranged relative to each other. The peripheral wall of the middle ring (21) is used for winding copper wires, and a wire threading ring (221) for threading the end of the copper wire is provided on one side ring (22). A tensioning assembly (5), which is used to clamp the copper wire between the iron core (7) and the wire threading ring (221). A magnetic powder brake (44), which is connected to the support wheel (6) and provides resistance to the middle ring (21) through the support wheel (6) to tension the copper wire. A driving assembly, which is used to drive the side ring (22) to rotate and wind the copper wire around the iron core (7).

2. The coil winding device for current transformer production according to claim 1, characterized in that, A sliding groove (24) is formed on the surface of the side ring (22) close to the middle ring (21). The cross-section of the sliding groove (24) is T-shaped and the sliding groove (24) is arranged along the arc direction of the side ring (22). A guiding ring (25) is arranged in the sliding groove (24). The guiding ring (25) is fixed to the middle ring (21) by bolts. The guiding ring (25) is composed of a plurality of arc-shaped structures, and the length of each arc-shaped structure is less than the length of the C-shaped opening of the side ring (22).

3. A coil winding device for the production of mutual inductors according to claim 1, characterized in that, Ribs (27) are arranged on the inner peripheral wall of the middle ring (21), and an annular groove (61) is formed on the peripheral wall of the support wheel (6). The ribs (27) are supported in the annular groove (61).

4. A coil winding device for the production of instrument transformers according to claim 1, characterized in that, A through hole (222) is formed at the position of the edge of the winding wheel (2) corresponding to the wire threading ring (221). A detachable guiding block (28) is arranged in the through hole (222). One end of the guiding block (28) close to the wire threading ring (221) is formed into a V shape. The guiding block (28) is inserted into the through hole (222) and pushes the copper wire into the wire threading ring (221).

5. A coil winding device for the production of current transformers according to claim 1, characterized in that, The driving assembly includes two gear sets (41) for driving the side ring (22) to rotate. A synchronizing assembly (42) is arranged between the two gear sets (41), and the synchronizing assembly (42) is used to make the two gear sets (41) rotate synchronously. The distance between the two gear sets (41) is greater than the width of the C-shaped opening of the winding wheel (2).

6. The coil winding device for the production of current transformers according to claim 5, characterized in that, Another synchronizing assembly (42) is arranged between at least two of the support wheels (6). At the same time, a transmission assembly (45) is arranged between a support wheel (6) connected to the synchronizing assembly (42) and the gear set (41). When the copper wire is wound around the winding wheel (2), the driving assembly drives the middle ring (21) and the side ring (22) to rotate simultaneously through the transmission assembly (45).

7. A coil winding device for the production of mutual inductors according to claim 6, characterized in that, The transmission assembly (45) includes a first transmission gear (451), a second transmission gear (452), a transmission belt (453) and a one-way bearing (454). The first transmission gear (451) is coaxially fixed on the gear set (41). The second transmission gear (452) is coaxially arranged on the support wheel (6) through the one-way bearing (454). The transmission belt (453) is drivingly connected between the first transmission gear (451) and the second transmission gear (452). And the transmission ratio of the first transmission gear (451) and the second transmission gear (452) is used to make the middle ring (21) and the side ring (22) rotate at the same speed when winding the copper wire.

8. A coil winding device for the production of mutual inductors according to any one of claims 5-7, characterized in that, The gear set (41) includes two coaxially fixed driving gears (411). A toothed ring (48) is coaxially and fixedly arranged on the side ring (22). The toothed rings (48) on the two side rings (22) are respectively in one-to-one correspondence and meshed with the two driving gears (411).

9. The coil winding device for the production of mutual inductors according to claim 1, wherein, The tensioning assembly (5) includes two opposite clamping plates (51). The surfaces of the clamping plates (51) facing each other are arc-shaped surfaces. The plane between the two clamping plates (51) is aligned with the side of the winding wheel (2) where the wire passing ring (221) is provided. An installation plate (52) is arranged at a position corresponding to one of the clamping plates (51). A plurality of springs (53) are arranged between the installation plate (52) and the clamping plate (51).

10. A coil winding device for the production of current transformers according to claim 1, characterized in that, An installation assembly (3) is arranged on the frame (1). The installation assembly (3) includes a moving seat (31) and three rubber wheels (32) installed on the moving seat (31). By adjusting the distance between the three rubber wheels (32), iron cores (7) of different sizes can be placed. The moving seat (31) is slidably connected to the frame (1), and by adjusting the position of the moving seat (31), the winding wheel (2) can pass through the middle of the iron core (7).

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