Full-automatic winding equipment for miniature transformer

Abstract

The invention relates to the technical field of transformer winding, and discloses full-automatic winding equipment for a miniature transformer, which comprises a rotating shaft, one side of the rotating shaft is provided with a pay-off roller, one side of the pay-off roller is provided with a first distance sensor, one side of the rotating shaft is also provided with a wire pressing cylinder, and the other side of the rotating shaft is provided with a second distance sensor. Supporting rods are arranged at the two ends of the wire pressing cylinder, the wire pressing cylinder is rotationally connected with the supporting rods, a plurality of movable holes are formed in the wire pressing cylinder and divided into two sets, one set of movable holes are arranged in a positive spiral shape, and the other set of movable holes are arranged in a negative spiral shape. Movable blocks are movably arranged in the movable holes, and a control mechanism used for controlling the movable blocks in the two movable holes to alternately stretch out is arranged in the wire pressing cylinder. According to the invention, through switching of the two spiral bulge structures in different directions, the winding of wires in different directions is adapted, and the winding of the wires on the iron core is more compact.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer winding, and particularly to a fully automatic winding device for micro transformers. Background Art

[0002] A transformer is a device for transforming AC voltage, current, and impedance, and is widely used in fields such as power systems and electronic equipment. The main components of a transformer include an iron core, coils, and insulating materials. The coils have two or more windings, where the winding connected to the power supply is called the primary coil, and the remaining windings are called secondary coils. The basic working principle of a transformer is that when an alternating current passes through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil.

[0003] The winding is a key component of a transformer, and its performance directly affects the efficiency, loss, and reliability of the transformer. A transformer winding machine is a special device for winding transformer coils. It can wind a wire around an iron core according to specific turns and shapes, and through precise control, achieve efficient winding, ensure the quality and performance of the coils, and play a key role in transformer production, improving production efficiency and product quality. When the wire is wound around the iron core by the transformer winding machine, due to the centrifugal force generated by the continuous rotation of the iron core and the fluctuating change of the wire winding tension, the wire will become loose to a certain extent, the fit between the wire and the iron core will become worse, and the distance between the wires will not be compact enough, directly affecting the performance of the transformer.

[0004] In the prior art, in order to solve the problem that the wire is prone to looseness after winding, the method of increasing the wire tension is usually adopted to ensure that the wire is wound tightly. However, since the wire diameter of the wire used in micro transformers is very small, increasing the wire tension will thin the wire and reduce the wire diameter, thus affecting the performance of the transformer. The smaller the wire diameter, the easier it is to become thinner and the greater the impact. The invention patent with the publication number CN117976407B discloses a wire pressing auxiliary device and method for a transformer winding machine, which presses the winding part of the copper wire through a wire pressing roller for regular winding, and presses and regularizes from two points, thereby ensuring the density between layers of the wire. However, using this structure of the wire pressing roller can only ensure the density between layers, cannot ensure the density between adjacent two turns of the coil, and cannot solve the problem that the distance between the wires is not compact enough. Summary of the Invention

[0005] The purpose of the present invention is to provide a fully automatic winding device for micro transformers, aiming to solve the problems of uneven and non-dense winding when the winding machine in the prior art winds coils.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: Fully automatic wire winding equipment for a micro-transformer, characterized in that: it includes a rotating shaft, on one side of the rotating shaft, there is a wire pay-off roller, on one side of the wire pay-off roller, there is a first distance sensor, on one side of the rotating shaft, there is also a wire pressing cylinder, at both ends of the wire pressing cylinder, there are support rods, the wire pressing cylinder is rotationally connected to the support rods, on the wire pressing cylinder, there are a plurality of movable holes, the plurality of movable holes are divided into two groups, one group of the movable holes is arranged in a positive spiral shape, the other group of the movable holes is arranged in a reverse spiral shape, in the movable holes, there are movable blocks movably arranged, and in the wire pressing cylinder, there is a control mechanism for controlling the movable blocks in the two groups of movable holes to alternately protrude.

[0007] Through the above technical solution, the transformer iron core is fixed on the rotating shaft, the wire on the wire pay-off roller is drawn to the iron core, then the wire end is fixed on the lead of the iron core, the wire is pressed on the surface of the iron core by the wire pressing cylinder, then the rotating shaft starts to rotate, driving the iron core to rotate self, at this time, the wire pay-off roller starts to move horizontally, the wire passes through the gap between the wire pressing cylinder and the iron core and winds around the surface of the iron core, forming a spiral coil. According to the moving direction of the wire pay-off roller, through the control mechanism, one group of the movable blocks is controlled to protrude from the movable holes, forming a spiral convex structure on the surface of the wire pressing cylinder. The movable blocks generate a radial pressure to press the wire on the surface of the iron core. At the same time, the iron core rotates, generating friction with the wire pressing cylinder, driving the wire pressing cylinder to rotate. The outer diameters of the wire pressing cylinder and the iron core are inconsistent, resulting in inconsistent linear speeds at the contact place between the two. The movable blocks will not only generate a radial pressure to press the wire on the iron core, but also generate an axial thrust to press the adjacent two turns of the wire tightly. When the wire pay-off roller moves to the set position, it means that one layer of wire winding on the iron core is completed. The first distance sensor generates an electrical signal to control the wire pay-off roller to move horizontally in the reverse direction for the second layer of wire winding on the iron core. At this time, the control structure controls the group of the movable blocks that have protruded to retract into the movable holes, and controls the other group of the movable blocks to protrude from the movable holes, forming a reverse spiral convex structure on the surface of the wire pressing cylinder, cooperating with the wire pay-off roller to wind the second layer of wire on the iron core, and so on. Through the switching of the two spiral convex structures in different directions, it adapts to the wire winding in different directions, the wire winds more tightly on the iron core, and at the same time, the wire pressing cylinder applies pressure and thrust on the surface of the copper wire, without affecting the wire winding at both ends of the iron core.

[0008] It should be understood that the structures and principles for realizing functions such as driving the rotating shaft to rotate, fixing the wire on the rotating shaft, driving the wire pay-off roller to move horizontally, and drawing the wire to the lead of the iron core for fixing are all common technologies in this field and will not be elaborated here too much.

[0009] A further setting of the present invention is that: the control mechanism includes two inflatable hoses arranged inside the wire pressing cylinder. Two spiral grooves are formed on the inner wall of the wire pressing cylinder, and the two spiral grooves are arranged in a cross double helix. The two inflatable hoses are respectively located in the two spiral grooves. A plurality of rigid fixing pieces are also arranged inside the wire pressing cylinder. The plurality of rigid fixing pieces cover the spiral grooves. One side of the rigid fixing piece is fixedly connected to the outer wall of the inflatable hose, and both ends of the rigid fixing piece are fixedly connected to the inner wall of the wire pressing cylinder. The movable block is fixedly connected to the outer wall of the inflatable hose. Two two-way air pumps are arranged on the two inflatable hoses respectively, and both of the two two-way air pumps are electrically connected to the first distance sensor.

[0010] Through the above technical solution, when the core starts to wind the first layer of wire, one of the two two-way air pumps inflates, and the corresponding inflatable hose expands. Since the rigid fixing piece presses the inflatable hose in the spiral groove, after the air pressure inside the inflatable hose increases, it can only expand in the direction of the movable hole, extruding the movable block out of the movable hole, and the other two-way air pump pumps air, and the inflatable hose shrinks and becomes flat, pulling the movable block into the wire pressing cylinder; when the wire feeding roller moves to the set position, it means that one layer of wire has been wound on the core, and the first distance sensor generates an electrical signal, and the wire feeding roller moves in the reverse direction. When winding the second layer of copper wire, the working states of the two two-way air pumps also switch. The inflating two-way air pump becomes the air pumping one, and the air pumping two-way air pump switches to inflating, and the corresponding inflatable hoses also complete the switching of expansion and contraction, and the corresponding two groups of movable blocks complete the switching of the extending and contracting states, and the spiral convex structure on the surface of the wire pressing cylinder completes the commutation. In order to prevent working interference at the intersection of the two inflatable hoses, no movable holes and movable blocks are provided at the position of the wire pressing cylinder corresponding to the intersection of the two inflatable hoses, and at the same time, the rigid fixing piece corresponding to this position is set to be arc-shaped to prevent the two inflatable hoses from protruding out of the spiral groove after being superimposed. By pumping air and inflating with the two-way air pump, the structure is simple, and the state switching of the movable block can be completed in a short time.

[0011] A further setting of the present invention is that: the outer diameter of the movable block is larger than the radius of the wire. When the movable block extends out of the movable hole, the distance between the top of the movable block and the wire pressing cylinder is less than the diameter of the wire. When the inflatable hose is in a compressed state, the end of the movable block is located inside the movable hole. When the inflatable hose is in an expanded state, the end of the movable block is located outside the movable hole.

[0012] Through the above technical solution, the outer diameter of the movable block is larger than the radius of the wire, preventing a gap from being generated when the movable block is inserted between two turns of the wire. At the same time, the distance between the top of the movable block and the wire pressing cylinder is less than the diameter of the wire, which can prevent the wire from moving above the adjacent turn of the wire under the action of the thrust in the axial direction. At the same time, the height of the movable block is limited to prevent the movable block from completely disengaging from the movable hole.

[0013] A further setting of the present invention is that: the end of the movable block is spherical, and both the surface of the wire pressing cylinder and the end of the movable block are covered with polyurethane rubber.

[0014] Through the above technical solution, the movable block generates pressure and friction on the surface of the wire. The end of the movable block is spherical and is covered with polyurethane rubber at the same time, preventing the protruding block and the wire pressing cylinder from scratching the wire. At the same time, the polyurethane rubber is elastic. When the protruding block presses on the surface of the copper wire, the protruding block deforms and its height becomes lower, further preventing the wire from moving above the adjacent turn of the wire under the action of the thrust in the axial direction.

[0015] A further setting of the present invention is that: a guiding cylinder is arranged on one side of the wire pressing cylinder. Both end faces of the guiding cylinder are provided with guiding holes. The inner diameter of the guiding hole is equal to the outer diameter of the support rod. The support rod sequentially passes through the two guiding holes. A limiting plate is arranged on the support rod. A spring is sleeved on the support rod. Both the limiting plate and the spring are located inside the guiding cylinder. One end of the spring is connected to the limiting plate, and the other end is connected to the inner bottom of the guiding cylinder.

[0016] Through the above technical solution, when the wire on the iron core is wound for one layer, the outer diameter becomes larger, and the wire layer pushes the position of the wire pressing cylinder outwards. At this time, the spring is compressed, and the wire pressing cylinder retracts an appropriate distance, which can prevent the excessive pressure and friction between the guiding cylinder and the wire layer from affecting the winding.

[0017] A further setting of the present invention is that: a second distance sensor is arranged at one end of the support rod away from the wire pressing cylinder.

[0018] Through the above technical solution, the second distance sensor senses the position of the support rod, and can judge whether the position of the wire pressing cylinder is stable. When the position of the wire pressing cylinder changes repeatedly, it means that the axis of rotation of the iron core and the axis of the rotating shaft are not on the same straight line, and the wire winding needs to be stopped for adjustment.

[0019] A further setting of the present invention is that: a servo electric cylinder is arranged on one side of the guiding cylinder. The moving end of the servo electric cylinder is connected to the guiding cylinder. The servo electric cylinder is electrically connected to the second distance sensor.

[0020] Through the above technical solution, after the wire on the iron core is wound for one layer, the outer diameter becomes larger, and the wire layer pushes the position of the wire pressing cylinder outwards. At this time, the spring is compressed, the wire pressing cylinder retracts an appropriate distance, and the position of the support rod also retracts. The second distance sensor transmits an electrical signal, and the servo electric cylinder controls the movable cylinder to also retract an appropriate distance, keeping the degree of spring compression unchanged and the pressure of the wire pressing cylinder on the wire layer unchanged.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting a wire pressing cylinder in the present invention, movable holes arranged in a cross double helix structure are provided on the surface of the wire pressing cylinder, and movable blocks that can extend and retract are arranged in the movable holes. The control mechanism controls the extension and retraction of the movable holes, forming a positive spiral convex structure and a reverse spiral convex structure on the surface of the wire pressing cylinder respectively. The movable blocks generate a radial pressure to press the wire against the surface of the iron core, and at the same time generate an axial thrust to press adjacent two turns of the wire tightly. By switching between two spiral convex structures in different directions, it adapts to wire winding in different directions, and the wire is wound more tightly on the iron core. At the same time, the wire pressing cylinder applies pressure and thrust on the surface of the copper wire, and will not affect the wire winding at both ends of the iron core.

[0022] 2. By setting a two-way air pump in the present invention, the first distance sensor judges the wire winding direction and sends an electrical signal, and the two-way air pump receives the electrical signal for switching. The two-way air pump in the inflation state becomes a suction pump, and the two-way air pump in the suction state switches to inflation. The spiral convex structure on the surface of the wire pressing cylinder is reversed, which is simple in structure and convenient in operation for adapting to different winding layers of wires.

[0023] 3. By setting a second distance sensor in the present invention, after the wire on the iron core is wound for one layer, the outer diameter becomes larger. The second distance sensor detects that the position of the support rod retracts, and the servo electric cylinder controls the movable cylinder to also retract an appropriate distance, keeping the degree of spring compression unchanged and the pressure of the wire pressing cylinder on the wire layer unchanged and constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic diagram of the overall structure of an embodiment of the full-automatic wire winding device for a micro-transformer of the present invention; Figure 2 is a schematic diagram of the structure of the wire pressing cylinder in an embodiment of the full-automatic wire winding device for a micro-transformer of the present invention; Figure 3 It is a schematic structural diagram of a control mechanism in an embodiment of the fully automatic wire winding device for a micro-transformer of the present invention; Figure 4 It is a schematic structural diagram of a guide cylinder and a support rod in an embodiment of the fully automatic wire winding device for a micro-transformer of the present invention.

[0026] Reference numerals: 1, rotating shaft; 2, iron core; 3, wire pay-off roller; 4, first distance sensor; 5, wire pressing cylinder; 5a, movable hole; 5b, spiral groove; 6, support rod; 6a, limiting plate; 7, movable block; 8, control mechanism; 8a, inflatable hose; 8b, rigid fixing piece; 9, two-way air pump; 10, guide cylinder; 10a, guide hole; 11, spring; 12, second distance sensor; 13, servo electric cylinder. Detailed implementation manners

[0027] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] The fully automatic wire winding device for a micro-transformer provided by the present invention, as Figure 1 and Figure 2 shown, includes a rotating shaft 1. On one side of the rotating shaft 1, there is a wire pay-off roller 3. On one side of the wire pay-off roller 3, there is a first distance sensor 4. On one side of the rotating shaft 1, there is also a wire pressing cylinder 5. At both ends of the wire pressing cylinder 5, there are support rods 6. The wire pressing cylinder 5 is rotatably connected to the support rods 6. A plurality of movable holes 5a are formed in the wire pressing cylinder 5. The plurality of movable holes 5a are divided into two groups. One group of movable holes 5a is arranged in a positive spiral shape, and the other group of movable holes 5a is arranged in a reverse spiral shape. A movable block 7 is movably arranged in the movable hole 5a. The outer diameter of the movable block 7 is greater than the radius of the wire. When the movable block 7 extends out of the movable hole 5a, the distance between the top of the movable block 7 and the wire pressing cylinder 5 is less than the diameter of the wire. When the inflatable hose 8a is in a compressed state, the end of the movable block 7 is located in the movable hole 5a. When the inflatable hose 8a is in an expanded state, the end of the movable block 7 is located outside the movable hole 5a. The end of the movable block 7 is spherical. Both the surface of the wire pressing cylinder 5 and the end of the movable block 7 are covered with polyurethane rubber. A control mechanism 8 for controlling the movable blocks 7 in the two groups of movable holes 5a to alternately extend is arranged in the wire pressing cylinder 5.

[0029] As Figure 2As shown in the figure, the control mechanism 8 includes two inflatable hoses 8a arranged inside the wire pressing cylinder 5. Two spiral grooves 5b are formed on the inner wall of the wire pressing cylinder 5. The two spiral grooves 5b are arranged in a cross double helix. The two inflatable hoses 8a are respectively located in the two spiral grooves 5b. The movable block 7 is fixedly connected to the outer wall of the inflatable hose 8a. Two two-way air pumps 9 are arranged on the two inflatable hoses 8a. The two two-way air pumps 9 are both electrically connected to the first distance sensor 4.

[0030] As Figure 3 shown in the figure, a plurality of rigid fixing pieces 8b are further arranged inside the wire pressing cylinder 5 on the two inflatable hoses 8a. The plurality of rigid fixing pieces 8b cover the spiral grooves 5b. One side of the rigid fixing piece 8b is fixedly connected to the outer wall of the inflatable hose 8a. The two ends of the rigid fixing piece 8b are fixedly connected to the inner wall of the wire pressing cylinder 5.

[0031] As Figure 2 and Figure 4 shown in the figure, a guide cylinder 10 is arranged on one side of the wire pressing cylinder 5. Guide holes 10a are formed on both end faces of the guide cylinder 10. The inner diameter of the guide hole 10a is equal to the outer diameter of the support rod 6. The support rod 6 passes through the two guide holes 10a in sequence. A limit plate 6a is arranged on the support rod 6. A spring 11 is sleeved on the support rod 6. The limit plate 6a and the spring 11 are both located inside the guide cylinder 10. One end of the spring 11 is connected to the limit plate 6a, and the other end is connected to the inner bottom of the guide cylinder 10. A second distance sensor 12 is arranged at the end of the support rod 6 far from the wire pressing cylinder 5.

[0032] As Figure 2 shown in the figure, a servo electric cylinder 13 is further arranged on one side of the guide cylinder 10. The moving end of the servo electric cylinder 13 is connected to the guide cylinder 10. The servo electric cylinder 13 is electrically connected to the second distance sensor 12.

[0033] The working process and principle of this technical solution are as follows: Fix the transformer core 2 on the rotating shaft 1. Traverse the wire on the wire pay-off reel 3 to the core 2, then fix the wire end on the pin of the core 2. Press the wire against the surface of the core 2 with the pressing cylinder 5. At this time, one two-way air pump 9 inflates and the other pumps air. The movable block 7 extends from the movable hole 5a to form a spiral convex structure. Then the rotating shaft 1 starts to rotate, driving the core 2 to rotate. At this time, the wire pay-off reel 3 starts to move horizontally. The wire passes through the gap between the pressing cylinder 5 and the core 2 and winds around the surface of the core 2 to form a spiral coil. The spirally arranged movable blocks 7 exert a radial pressure on the coil, pressing the wire against the surface of the core 2. At the same time, as the core 2 rotates, friction is generated with the pressing cylinder 5, driving the pressing cylinder 5 to rotate. Since the outer diameters of the pressing cylinder 5 and the core 2 are different, the linear velocities at the contact points are different. The movable block 7 will not only generate a radial pressure but also an axial thrust, pushing the wire in the opposite direction of the movement of the wire pay-off reel 3 and pressing the adjacent two turns of the wire tightly. When the wire pay-off reel 3 moves to the set position, it means that one layer of wire has been wound on the core 2. The first distance sensor 4 generates an electrical signal to control the wire pay-off reel 3 to move horizontally in the reverse direction to wind the second layer of wire on the core 2. At this time, the two-way air pump 9 in the inflated state starts to pump air, and the two-way air pump 9 in the air-pumping state starts to inflate, controlling the extended set of movable blocks 7 to retract into the movable hole 5a, and the other set of movable blocks 7 extends from the movable hole 5a to form a spiral convex structure in the opposite direction on the surface of the pressing cylinder 5 to cooperate with the wire pay-off reel 3 to wind the second layer of wire on the core 2. And so on. By switching between two spiral convex structures in different directions, it adapts to the wire winding in different directions, making the wire wind more tightly on the core 2. At the same time, the pressing cylinder 5 exerts pressure and thrust on the surface of the copper wire, without affecting the wire winding at both ends of the core 2. At the same time, when the first layer of copper wire is wound on the core 2, the outer diameter becomes larger, and the wire layer pushes the position of the pressing cylinder 5 outwards. At this time, the spring 11 is compressed, and the pressing cylinder 5 retracts an appropriate distance. The second distance sensor 12 detects the retraction of the distance of the support rod 6 and transmits an electrical signal to the servo electric cylinder 13 to control the retraction distance of the movable cylinder, offsetting the retraction distance of the support rod 6 and keeping the pressure of the pressing cylinder 5 on the wire layer unchanged.

[0034] In the technical solution, the multiple copper wire layers on the core 2 are formed by alternately stacking the forward winding layers and the reverse winding layers, and a self-locking force is formed between the layers. After the winding is completed, the coil is not easy to loosen.

[0035] At the same time, the technical solution adopts the method of pulling the copper wire winding by rotating the core 2. By moving the wire pay-off reel back and forth, the forward winding layer and the reverse winding layer can be formed. If the method of alternately winding the core 2 forward and backward is adopted, two different wire pay-off reels must be used to switch the winding back and forth, and the efficiency will be greatly reduced, unable to meet the high-speed winding requirements in actual production.

[0036] To prevent interference with the wire when the two sets of movable blocks 7 switch states, the inflatable hose 8a in the inflated state first deflates, pulls the movable block 7 into the movable hole 5a, and then the other inflatable hose 8a starts to deflate to push the other set of movable blocks 7 out of the movable hole 5a.

[0037] This technical solution is applicable to the cylindrical iron core 2. When winding the cylindrical iron core 2, if the second distance sensor 12 detects that the position of the wire pressing cylinder 5 changes repeatedly, it indicates that the axis of rotation of the iron core 2 and the axis of the rotating shaft 1 are not on the same straight line, and the winding needs to be stopped for adjustment.

[0038] When this technical solution winds the wire around the square iron core 2, the thrust of the square iron core 2 on the wire pressing cylinder 5 is not uniform during rotation. It is necessary to control the rotation speed of the square iron core 2, and the rotation speed cannot be too high to keep the wire pressing cylinder 5 in contact with the surface of the iron core 2 all the time.

[0039] It should be noted that the various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to describe the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0040] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the protection scope of the claims.

Claims

1. An automatic winding device for a micro-transformer, characterized in that: It includes a rotating shaft (1). On one side of the rotating shaft (1), a wire pay-off roller (3) is provided. On one side of the wire pay-off roller (3), a first distance sensor (4) is provided. On one side of the rotating shaft (1), a wire pressing cylinder (5) is also provided. At both ends of the wire pressing cylinder (5), support rods (6) are provided. The wire pressing cylinder (5) is rotatably connected to the support rods (6). A plurality of movable holes (5a) are formed in the wire pressing cylinder (5). The plurality of movable holes (5a) are divided into two groups. One group of the movable holes (5a) is arranged in a positive spiral shape, and the other group of the movable holes (5a) is arranged in a reverse spiral shape. A movable block (7) is movably arranged in the movable hole (5a). A control mechanism (8) for controlling the alternate extension of the movable blocks (7) in the two groups of movable holes (5a) is arranged in the wire pressing cylinder (5).

2. The fully automatic wire winding device for a micro-transformer according to claim 1, characterized in that: The control mechanism (8) includes two inflatable hoses (8a) arranged in the wire pressing cylinder (5). Two spiral grooves (5b) are formed on the inner wall of the wire pressing cylinder (5). The two spiral grooves (5b) are arranged in a cross double spiral. The two inflatable hoses (8a) are respectively located in the two spiral grooves (5b). A plurality of rigid fixing pieces (8b) are also arranged in the wire pressing cylinder (5). The plurality of rigid fixing pieces (8b) cover the spiral grooves (5b). One side of the rigid fixing piece (8b) is fixedly connected to the outer wall of the inflatable hose (8a). Both ends of the rigid fixing piece (8b) are fixedly connected to the inner wall of the wire pressing cylinder (5). The movable block (7) is fixedly connected to the outer wall of the inflatable hose (8a). Two double-action air pumps (9) are arranged on the two inflatable hoses (8a). The two double-action air pumps (9) are both electrically connected to the first distance sensor (4).

3. The fully automatic wire winding device for a micro-transformer according to claim 2, wherein: The outer diameter of the movable block (7) is larger than the radius of the wire. When the movable block (7) extends out of the movable hole (5a), the distance between the top of the movable block (7) and the wire pressing cylinder (5) is less than the diameter of the wire. When the inflatable hose (8a) is in a compressed state, the end of the movable block (7) is located in the movable hole (5a). When the inflatable hose (8a) is in an expanded state, the end of the movable block (7) is located outside the movable hole (5a).

4. The fully automatic wire winding device for a micro-transformer according to claim 3, characterized in that: The end of the movable block (7) is spherical. The surface of the wire pressing cylinder (5) and the end of the movable block (7) are both covered with polyurethane rubber.

5. The fully automatic wire winding device for a micro-transformer according to claim 1, characterized in that: On one side of the wire pressing cylinder (5), a guiding cylinder (10) is provided. Both end faces of the guiding cylinder (10) are provided with guiding holes (10a). The inner diameter of the guiding holes (10a) is equal to the outer diameter of the support rod (6). The support rod (6) sequentially passes through the two guiding holes (10a). A limiting plate (6a) is arranged on the support rod (6). A spring (11) is sleeved on the support rod (6). Both the limiting plate (6a) and the spring (11) are located inside the guiding cylinder (10). One end of the spring (11) is connected to the limiting plate (6a), and the other end is connected to the inner bottom of the guiding cylinder (10).

6. The fully automatic wire winding device for a micro-transformer according to claim 5, characterized in that: A second distance sensor (12) is arranged at one end of the support rod (6) away from the wire pressing cylinder (5).

7. The fully automatic wire winding device for a micro-transformer according to claim 6, characterized in that: A servo electric cylinder (13) is arranged on one side of the guiding cylinder (10). The moving end of the servo electric cylinder (13) is connected to the guiding cylinder (10). The servo electric cylinder (13) is electrically connected to the second distance sensor (12).

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