CN116130198A - Coil and winding method thereof, coil winding equipment, handle and electromagnetic generating device - Google Patents

Abstract

The invention provides a coil and a manufacturing method thereof, coil winding equipment, a handle and an electromagnetic generating device. When the coil is electrified and generates a magnetic field, the center distance between the inner side spiral coils is large, and the center distance between the outer side spiral coils is small, so that the superposition degree of the sub-magnetic fields generated by the inner side spiral coils is reduced, the superposition degree of the sub-magnetic fields generated by the outer side spiral coils is increased, the intensity distribution uniformity of the magnetic field of the coil is improved, and the coil is applied to a handle of an electromagnetic generating device and is used for improving the treatment safety and the use comfort when being used for treating a target area of a target object.

Description

Coil and winding method thereof, coil winding equipment, handle and electromagnetic generating device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a coil and a winding method thereof, coil winding equipment, a handle and an electromagnetic generating device.

Background

With the development of medical industry and beauty industry, an electromagnetic muscle-molding device for realizing fat-reducing exercise and muscle-shaping by using high-intensity focused electromagnetic (HIAEM) technology is in the field of vision of people. The principle of the electromagnetic muscle-shaping device is as follows: the handle comprising the coil is fixed on the skin surface, the coil is powered by the host computer and generates periodic current pulses, so that a periodic focusing strong magnetic field is manufactured, the magnetic field acts on muscles, the nerves of the muscles generate action potentials, and the muscles are stimulated to contract and relax at high frequency, so that the aim of exercise is fulfilled. At present, the pulse frequency of the electromagnetic muscle-shaping device is usually 0 Hz-50 Hz, and the working frequency is mainly 5 Hz-38 Hz.

The handles of the prior art have problems such as uneven magnetic field distribution, which results in excessive magnetic field in one part of the coil and insufficient magnetic field in the other part of the coil, which affects the safety and comfort of the treatment. The coil has a problem of poor heat dissipation, which may affect the service life of the handle.

Disclosure of Invention

The invention aims to provide a coil, a manufacturing method thereof, coil winding equipment, a handle and an electromagnetic generating device, and aims to improve uniformity of a magnetic field generated by the coil and use safety and comfort.

In order to achieve the above object, the present invention provides a coil, including a coil body, wherein the coil body is a spiral structure formed by winding a wire, and includes a plurality of spiral coils connected in sequence;

the center distance between two adjacent spiral coils gradually decreases along the radial outward direction of the coil body.

Optionally, the widths of all the spiral turns decrease gradually in a radially outward direction of the coil body.

Alternatively, the width of the gap between adjacent two of the spiral turns is constant, or the width of the gap between adjacent two of the spiral turns gradually decreases in a radially outward direction of the coil body.

Optionally, the wire is woven from a plurality of sub-wires.

Optionally, the coil body has axially opposite first and second ends;

the height of the coil body increases and decreases along the radial outward direction of the coil body, and the innermost spiral ring of the coil body and the outermost spiral ring of the coil body are aligned at the first end.

Optionally, the axial dimension of the spiral turn located at the innermost side of the coil body is equal to the axial dimension of the spiral turn located at the outermost side of the coil body.

Optionally, the maximum height of the coil body is 4/3 to 8/5 of the height of the wire in a natural state.

Optionally, the coil body includes N spiral turns, and the spiral turn located at the innermost side of the coil body is the 1 st spiral turn; the highest point of the coil body is positioned on the nth coil, the ratio of N to N is 0.2-0.4, and N and N are integers greater than 1.

Optionally, two adjacent spiral turns of the coil body are at least partially overlapped in the axial direction, and the coil body has a gap; the coil further includes an encapsulation structure filling the void and wrapping the coil body.

To achieve the above object, the present invention also provides a handle comprising a housing and a coil as set forth in any one of the preceding claims, the coil being disposed inside the housing.

In order to achieve the above object, the present invention further provides an electromagnetic generating device, which includes a main unit and the handle as described above, wherein the main unit is electrically connected to the coil and is used for making the coil generate a magnetic field.

In order to achieve the above object, the present invention also provides a coil manufacturing method for winding a coil as described above, the coil manufacturing method comprising the steps of:

providing a wire, wherein the wire is formed by braiding a plurality of strands of sub-wires;

spirally winding the wire onto a mandrel, and applying a pulling force to the wire to straighten the wire and controlling the pulling force to increase from a first predetermined value to a second predetermined value during the winding process so that the wire forms the coil body; the method comprises the steps of,

the coil body is separated from the mandrel.

Optionally, the first predetermined value is 60N to 120N, and the second predetermined value is 100N to 200N.

Optionally, during winding, one end of the wire away from the mandrel is kept at a predetermined position, the mandrel is controlled to rotate, the mandrel is further controlled to move a predetermined distance along a first direction, and then the mandrel is controlled to move the predetermined distance along a second direction opposite to the first direction, and the first direction and the second direction are parallel to each other in the axial direction of the mandrel.

Optionally, the mandrel moves in the first direction at a first rate and moves in the second direction at a second rate, the first rate being greater than the second rate.

Optionally, two adjacent spiral turns of the coil body are at least partially overlapped in the axial direction, and the coil body has a gap;

the coil manufacturing method further includes filling the gap of the coil body with an encapsulation material, and causing the encapsulation material to encapsulate the coil body.

In order to achieve the above object, the present invention also provides a coil winding apparatus for preparing a coil as described above, the coil winding apparatus including a mandrel, a first driving mechanism, and a wire pulling mechanism; wherein,,

the mandrel is provided with a positioning groove, the positioning groove is used for fixing one end of a wire, and the wire is formed by braiding a plurality of strands of sub-wires;

the first driving mechanism is connected with the mandrel and used for driving the mandrel to rotate so as to spirally wind the wire on the mandrel;

the wire pulling mechanism is used for being connected with the wire and is configured to apply a pulling force to the wire in the winding process so as to straighten the wire, and the pulling force is gradually increased from a first preset value to a second preset value.

Optionally, the coil winding device further comprises a second driving mechanism, and the second driving mechanism is connected with the mandrel;

the second driving mechanism is used for driving the mandrel to move a preset distance along a first direction at a first speed in the winding process, and then moving the mandrel along a second direction at a second speed for the preset distance; the first direction and the second direction are parallel to the axial direction of the mandrel, and the first direction is opposite to the second direction, and the first speed is greater than the second speed.

Compared with the prior art, the coil and the manufacturing method thereof, the coil winding equipment, the handle and the electromagnetic generating device have the following advantages:

the coil comprises a coil body, wherein the coil body is of a spiral structure formed by winding wires, the coil body comprises a plurality of spiral coils which are sequentially connected, the center distances of two adjacent spiral coils are gradually reduced along the radial outward direction of the coil, and the center distances of two adjacent spiral coils are gradually reduced along the radial outward direction. By adopting the structure, when the coil is electrified and generates a magnetic field, the superposition degree of the magnetic field formed by the adjacent spiral coils is reduced due to the fact that the center distance between the adjacent spiral coils close to the inner side is larger, and the superposition degree of the magnetic field formed by the adjacent spiral coils is increased due to the fact that the center distance between the adjacent spiral coils close to the outer side is smaller, so that the distribution uniformity of the magnetic field generated by the whole coil can be improved. When the coil is applied to the handle of the electromagnetic generating device, when a magnetic field with relatively uniform distribution acts on a target area of a patient, nerves of muscles in the range of the target area are stimulated relatively uniformly, so that the treatment effect is improved, and the safety and the use comfort are improved.

The coil preparation method comprises the following steps: providing a wire, wherein the wire is formed by braiding a plurality of strands of sub-wires; spirally winding the wire onto a mandrel, and applying a pulling force to the wire to straighten the wire and controlling the pulling force to increase from a first predetermined value to a second predetermined value during the winding process so that the wire forms the coil body; and, separating the coil body from the mandrel; in the winding process, the width of the braided wire is gradually reduced by increasing the pulling force applied to the wire, and when the wire is wound on a mandrel and a spiral coil body is formed, the center distance between two adjacent spiral coils is gradually reduced along the radial outward direction of the coil. The method has the advantages of simplicity, convenience and easiness in implementation.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic diagram of a coil body of a prior art electromagnetic generating device;

FIG. 2 is a schematic view of an archimedes spiral;

FIG. 3 is a schematic diagram of the relationship between the strength of a magnetic field generated by a coil body of a prior art electromagnetic generating device and the radius of the coil body;

fig. 4 is a schematic structural view of a coil provided according to a first embodiment of the present invention;

fig. 5 is a cross-sectional view of a coil provided according to a second embodiment of the present invention;

fig. 6 is a schematic structural view of a coil manufacturing apparatus according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a change relation between a distance and time when a mandrel moves along an axial direction of the mandrel when the coil is prepared by using the coil preparation device according to the embodiment of the invention.

Reference numerals are described as follows:

10 100-coil body, 11, 110-coil, 101-first end, 102-second end; 1-dabber, 2-act as go-between mechanism, 3-first actuating mechanism, 4-second actuating mechanism.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

In addition, each embodiment of the following description has one or more features, respectively, which does not mean that the inventor must implement all features of any embodiment at the same time, or that only some or all of the features of different embodiments can be implemented separately. In other words, those skilled in the art can implement some or all of the features of any one embodiment or a combination of some or all of the features of multiple embodiments selectively, depending on the design specifications or implementation requirements, thereby increasing the flexibility of the implementation of the invention where implemented as possible.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, as for example, they may be fixed, they may be removable, or they may be integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention will be further described in detail with reference to the accompanying drawings, in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. The same or similar reference numbers in the drawings refer to the same or similar parts.

Fig. 1 is a schematic view showing a structure of a coil body 10 of a handle of a related art electromagnetic generating device. As shown in fig. 1, in the prior art, the widths of all the coils 11 of the coil body 10 are equal, and the widths d of the gaps between all the coils 11 are also equal. That is, the center distances p between any adjacent two of the spiral turns 11 in the coil body 10 in the related art are equal, so that the coil body 10 can be regarded as an archimedes spiral as shown in fig. 2.

When the coil body 10 is energized, current flows through each of the coils 11 to generate a sub-magnetic field, and the sub-magnetic fields generated by all of the coils 11 are superimposed to form a magnetic field. The current density in each of the coils 11 is gradually reduced in the radially outward direction of the coil body 10, so that the strength of the sub-magnetic field generated by each of the coils 11 is also gradually reduced in the radially outward direction of the coil body 10, which results in that the strength of the superimposed magnetic field is gradually reduced in the radially outward direction from the innermost one of the coils 11 on the same plane (as shown in fig. 3). In this way, when the electromagnetic generating device is an electromagnetic muscle molding device, when the handle is used for treating the target area of the target object, if the intensity of the inner part of the magnetic field is proper, the intensity of the magnetic field of the outer part is insufficient, the treatment area is reduced, and if the intensity of the outer part of the magnetic field is proper, the intensity of the inner part is too high, and the use is uncomfortable and unsafe.

In view of this, as shown in fig. 4, a first embodiment of the present invention provides a coil that can be used for a handle of an electromagnetic generating device and for generating a magnetic field to treat a target area of a target object. The coil includes a coil body 100, and the coil body 100 is a spiral structure wound with a wire such that the coil body 100 includes a plurality of spiral turns 110. The center distance p between two adjacent spiral turns 110 gradually decreases in the radially outward direction of the coil body 100Is small. In other words, the embodiment of the present invention reduces the degree of superposition between the sub-magnetic fields generated by the inner coil 110 and enhances the degree of superposition of the sub-magnetic fields generated by the outer coil 110 by controlling the center distance p between the adjacent two coils 110 of the coil body 100 to decrease in the inside-to-outside direction. This reduces the intensity of the inner part of the magnetic field generated by the coil body 100 (i.e., the magnetic field obtained by superimposing the sub-magnetic fields generated by the respective coils 110) and increases the intensity of the outer part of the magnetic field, thereby improving the uniformity of the distribution of the intensity of the magnetic field, so that the handle is stimulated by a more uniform magnetic field over the entire area of the target area when the handle is used for treating the target area of the target subject. The center distance p is the distance between the midpoints of two adjacent spiral turns 110, as seen in the radial direction of the coil body 100, and in fig. 4, the two midpoints are denoted by O ₁ And O ₂ 。

Those skilled in the art know that there is inevitably a gap between two adjacent turns during the winding of the wire into a helical structure. In the case where the parameters such as the width m of the wire and the winding speed are not changed, the width d of the gap (as shown in fig. 1 and 4) is always unchanged (as shown in fig. 1), and when the parameters are changed, the width d of the gap may be changed accordingly, for example, when the width m of the wire is reduced in the radially outward direction of the coil body 100, the width d of the gap may be unchanged or may be reduced in the radially outward direction (as shown in fig. 4). Here, the width m of the wire means a dimension of the wire in a radial direction of the coil body when the wire is wound into the coil body of a spiral structure.

In this embodiment, the width m of the wire is gradually reduced along the radial outward direction of the coil body 100, so that the width of the coil 110 is gradually reduced along the radial outward direction of the coil body 100, thereby achieving the purpose that the center distance p between two adjacent coils 110 is reduced along the radial outward direction of the coil body 100. Moreover, the width m of the wire decreases from inside to outside, so that the resistance per unit length of the inner spiral coil 110 is smaller, and less heat is generated, which is beneficial to heat dissipation of the coil body 100. And, when the width d of the gap between two adjacent spiral coils 110 is correspondingly reduced along the radial outward direction, the contact area between the inner spiral coil 110 and the air is further increased, and the heat dissipation effect is improved.

Alternatively, the wire may be litz wire braided from a plurality of sub-wires. The reason for using litz wire as the wire is that the litz wire is stretched under different pulling forces, the width thereof is changed correspondingly, in particular the width and the height thereof are reduced correspondingly when the litz wire is stretched, and the greater the pulling force, the greater the degree of reduction of the width and the height. The width m of the wire can be adjusted by changing the tension in the process of winding the coil body 100, which is simple and convenient and easy to implement. In addition, the use of litz wire also reduces the skin effect, and the litz wire has good flexibility and a non-smooth outer surface, facilitating the winding of the coil body 100 on a mandrel 1 (shown in fig. 6).

Alternatively, the cross section of the wire may be a rectangle, the length of the short side of the rectangle being defined as the width m of the wire, and the length of the long side of the rectangle being defined as the height of the wire. In one specific implementation, the conductor is braided from 10 to 20 strands of the subconductors, each strand comprising 5 to 10 copper strands (including pure copper or red copper strands). The wire diameter of each strand of sub-wire is 0.1-0.2 mm, the width of the rectangle is 1-4 mm, and the height is 15-20 mm.

The embodiment of the invention has no special limitation on the weaving mode of the wire. For example, in some implementations, a plurality of sub-wires are woven directly into the wire with a rectangular cross section, or in other implementations, a plurality of sub-wires are woven into a tubular mesh structure with a diameter of 10mm to 15mm, and then the tubular mesh structure is flattened to obtain the wire with a rectangular cross section.

Of course, the cross section of the wire may be circular, and the width m and the height of the wire are both the diameters of the circular shape.

Referring back to fig. 1, all the spiral coils 11 of the coil body 10 in the prior art have equal heights, when radiating heat by air convection (natural convection or forced convection by a fan), wind blows from the side of the coil body 10, and the windward side of the coil body 10 is small, so that the radiating effect is still insufficient.

In this regard, the present invention also provides a second embodiment that designs the coil body 100 to be of a heightened structure on the basis of the first embodiment. Referring to fig. 5, the coil body 100 has a first end 101 and a second end 102 which are axially opposite, and the first end 101 is closer to a target area of a target object than the second end 102 when the coil body 100 is used for an electromagnetic generating device and treats the target area. The height of the coil body 100 increases and decreases in a radially outward direction of the coil body 100, and the spiral turn 110 (not labeled in fig. 5) located at the innermost side of the coil body 100 is aligned with the spiral turn 110 located at the outermost side of the coil body 100 at the first end. With this structure, on the one hand, the windward side of the coil body 100 can be increased, the heat dissipation effect of the coil body 100 can be improved, on the other hand, when the coil body 100 is mounted on a housing and forms a handle (not shown in the figure), the first end 101 abuts against the housing, and in this embodiment, the innermost one of the coils 110 and the outermost one of the coils 110 are aligned on the first end 101, so that the two coils 110 can abut against the housing at the same time, the contact area can be increased, and the assembly stability can be further improved. Optionally, in some specific implementations, the axial dimension of the innermost one of the spiral turns 110 of the coil body 100 is also equal to the axial dimension of the outermost one of the spiral turns 110 of the coil body 100.

Preferably, the highest point of the coil body 100 should be as close as possible to the axis of the coil body 100. Specifically, when the coil body 100 includes N spiral turns 110, and the spiral turns 110 are numbered 1 st spiral turn 110, 2 nd spiral turn 110 … … N-1 st spiral turn 110, and N-th spiral turn 110 in order in a radially outward direction of the coil body 100. The highest point of the coil body 100 is located on the nth spiral turn 110, and preferably the ratio of N to N is 0.2 to 0.4, and N are integers greater than 1. For example, when the coil body 100 includes 100 coils 110, the highest point of the coil body 100 may be located on any one of the 20 th to 40 th coils 110. According to practical situations, the maximum height of the coil body 100 is 4/3 to 8/5 of the height of the wire in a natural state, wherein the wire in a natural state refers to a state in which the wire is not stretched. With such a configuration, when the magnetic field generated by the coil body 100 acts on the target area, the distance from the nth coil 110 and the coils 110 on both sides thereof, which are close to the axis, to the target area is larger, thereby further improving the uniformity of the intensity of the magnetic field acting on the target area by the coil body 100. On the other hand, the wind flowing through the coil body 100 forms a rotational flow, so that the air is converted into a turbulent flow from a laminar flow, the contact area between the coil body 100 and the air flow is increased, the heat exchange effect is improved, and the heat dissipation is enhanced. When natural convection heat dissipation is performed, the temperature of the surface of the coil body 100 of the present embodiment is reduced by 2 to 3 ℃ compared with the original 10 of the coil in the prior art.

The present invention also provides a third embodiment in which the coil body is provided in a tapered configuration (not shown) with an innermost one of the turns being located at the second end and an outermost one of the turns being located at the first end. That is, when the coil body is fitted to the handle, and the more the coil is located inside the handle when the handle is in operation, the more the coil is located away from the target area, which can achieve the purpose of improving the uniformity of the intensity of the magnetic field acting on the target area. However, when the coil body of the present embodiment is mounted to the housing, only the outermost coil is abutted against the housing, and the assembly stability is slightly poor.

Adjacent two spiral turns 110 of the coil body 100 are at least partially overlapped in the axial direction of the coil body 100 (for the second and third embodiments, adjacent two spiral turns 110 are partially overlapped in the axial direction), and the coil body 100 has a gap. The coil further includes a package structure (not shown) for filling the gap and wrapping the coil body 100 to maintain the structure of the coil body 100 from being scattered.

The void ratio of the coil body 100 is 0.6 to 0.8, and the void ratio refers to the ratio of the volume of the copper wire in the wire to the volume of the coil body 100. The stiffness coefficient of the packaging structure is 200N/m-5000N/m, the damping ratio is 0.3-0.5, and the mass of the coil after packaging is 1.2 Kg-2.5 Kg. The coil can vibrate during operation, and the package structure has a certain elasticity and is nonlinear, and can absorb energy during vibration, that is, the package structure can be regarded as a structure of a spring and a damper, which fills a gap in the coil body 100, so that the amplitude of the coil can be reduced, resonance is avoided, and noise is reduced. Furthermore, the arrangement of the packaging structure also enables the coil to have a certain compressibility, and when the coil is assembled with the housing, the coil can be tightly matched with the housing. For example, in preparing the coil, the coil may be formed in a size of 15cm to 16cm in outer diameter and 18mm to 25mm in height, and when the coil is mounted in the housing, the coil may be compressed to 15cm to 15.5cm in outer diameter and 15mm to 18mm in height. In addition, the package structure includes, but is not limited to, silicone gel, and the thermal conductivity of the silicone gel can reach 20 W.m/k, so that the package structure has better thermal conductivity, and after the coil body 100 is wrapped, the heat dissipation area of the coil is enlarged, and the heat dissipation is enhanced.

Further, the embodiment of the invention also provides a handle which can be used for the electromagnetic generating device. The handle comprises a shell and the coil, wherein the shell comprises a cover body and a bottom plate which are connected with each other, the cover body and the bottom plate enclose a containing cavity, the coil is arranged in the containing cavity, and the first end of the coil body is abutted to the bottom plate. When the electromagnetic generating device is the electromagnetic muscle molding device, the bottom plate can be directly contacted with the skin of the target area of the target object in the treatment process, or a separator (the separator can be an object such as cloth) is arranged between the bottom plate and the skin of the target area.

Further, the embodiment of the invention also provides an electromagnetic generating device, which comprises the handle and a host, wherein the host is electrically connected with the coil and is used for enabling the coil to generate a magnetic field. The electromagnetic generating device can be an electromagnetic muscle molding device.

Further, the embodiment of the invention also provides a coil winding method for winding the coil. The coil preparation method comprises the following steps:

step S1: a wire is provided which is litz wire woven from a plurality of sub-wires.

Step S2: the wire is spirally wound onto a mandrel 1 (shown in fig. 6), and during the winding process, a pulling force is applied to the wire to straighten the wire, and the pulling force is controlled to gradually increase from a first predetermined value to a second predetermined value to form the coil body 100. The method comprises the steps of,

step S3: the coil body 100 is separated from the mandrel 1.

When the coil further includes the package structure, the coil preparation method further includes step S4: the gap of the coil body 100 is filled with the encapsulation structure, and the encapsulation structure wraps the coil body.

In step S2, one end of the wire is fixed on the mandrel 1, and the other end is wound around a wire pulling mechanism 2 (as shown in fig. 6). During the winding process, the mandrel 1 rotates at a constant rate, and the wire pulling mechanism 2 gradually releases the wire so that the wire is wound on the mandrel 1. The wire pulling mechanism 2 applies the pulling force to the wire so that the wire is always in a straightened state, and the pulling force is gradually increased from the first preset value to the second preset value, so that the width m of the wire is gradually reduced, the width of the coiled coil 110 is gradually reduced along the direction away from the mandrel 1, and finally the center distance p between two adjacent coils 110 is gradually reduced along the radial outward direction of the coil body 100. Here, the tension may be continuously increased, or the tension may be stepwise increased, which is not limited in the embodiment of the present invention, as long as the tension can be increased from an initial first predetermined value to a final second tension value. Optionally, the first predetermined value is 60N to 120N, and the second predetermined value is 100N to 200N.

It will be appreciated that the wire pulling mechanism is always in a predetermined position during the winding process. In the step S2, if the mandrel 1 is controlled to move along a first direction by a predetermined distance and then move along a second direction opposite to the first direction by the predetermined distance, the first direction and the axial direction of the mandrel 1 are parallel to each other, the coil body 100 with the height increasing and decreasing along the radial direction and the outward direction (that is, the coil body 100 provided in the foregoing second embodiment) may be obtained.

Wherein the mandrel 1 moves in the first direction at a first rate and moves in the second direction at a second rate, the first rate being greater than the second rate, such that the distance of movement of the mandrel 1 is related to the winding time as shown in fig. 7. In doing so, the highest point of the coil body 100 may be located on the nth coil 110 (the innermost coil 110 is the 1 st coil 110), the ratio of N to N is 0.2 to 0.4, N is the total number of coils 110, and N are integers greater than 1.

In the step S2, if the mandrel 1 is controlled to move along the first direction all the time, the coil body 100 having a tapered shape (i.e., the coil body 100 provided in the foregoing third embodiment) may be obtained.

In addition, the embodiment of the invention also provides coil winding equipment which is used for executing the steps S1 to S3 in the coil winding method. As shown in fig. 6, the coil winding apparatus at least includes a mandrel 1, a wire pulling mechanism 2 and a first driving mechanism 3, a positioning groove (not shown in the drawing) is disposed on the mandrel 1, the size of the positioning groove is determined according to actual needs, for example, the width is 2 mm-3 mm, and the positioning groove is used for fixing the one end of the wire. The wire pulling mechanism 2 is used for being connected with the wire and providing the pulling force for the wire. The first driving mechanism 3 is connected with the mandrel 1 and is used for driving the mandrel 1 to rotate so as to wind the wire onto the mandrel 1.

Further, the coil winding apparatus further comprises a second driving mechanism 4, the second driving mechanism 4 being connected to the mandrel 1 and being adapted to drive the mandrel to move in the first direction or the second direction. Here, the second driving mechanism 4 may be indirectly connected to the mandrel 1, specifically, the coil winding apparatus may include a first base (not shown in the drawing), where the mandrel 1 and the first driving mechanism 3 are disposed on the first base, and the second driving mechanism 4 is connected to the first base, that is, the second driving mechanism 4 is connected to the mandrel 1 through the first base, and the second driving mechanism 4 is configured to drive the first base to move in the first direction or the second direction, so as to drive the mandrel 1 to move in the first direction or the second direction.

Further, a pattern may be formed on the outer surface of the mandrel 1, so as to increase the friction between the mandrel 1 and the wire, and avoid slipping during winding. Further, the outer diameter of the mandrel 1 may be changed along the axial direction of the mandrel 1, so that one mandrel 1 may be used for winding the coil body 100 of different specifications. The outer diameter of the mandrel 1 may be continuously variable in the axial direction or may be stepwise variable.

According to the technical scheme provided by the invention, the magnetic field generated by the coil body is more uniform, and when the coil body is applied to the handle of an electromagnetic generating device such as an electromagnetic muscle molding device, and the electromagnetic muscle molding device is utilized to treat the target area of a target object, the whole range of the target area can be stimulated by the more uniform magnetic field, so that the treatment safety and the use comfort are improved. And, the radiating effect of coil body is better, improves the life of coil.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (18)

1. The coil is characterized by comprising a coil body, wherein the coil body is of a spiral structure formed by winding a wire and comprises a plurality of spiral coils which are sequentially connected;

the center distance between two adjacent spiral coils gradually decreases along the radial outward direction of the coil body.

2. The coil of claim 1 wherein the widths of all of the helical turns taper in a radially outward direction of the coil body.

3. A coil according to claim 2, wherein the width of the gap between adjacent two of the coils is constant or the width of the gap between adjacent two of the coils gradually decreases in a radially outward direction of the coil body.

4. The coil of claim 1 wherein the wire is braided from a plurality of sub-wires.

5. The coil of claim 1, wherein the coil body has axially opposite first and second ends;

the height of the coil body increases and decreases along the radial outward direction of the coil body, and the innermost spiral ring of the coil body and the outermost spiral ring of the coil body are aligned at the first end.

6. The coil of claim 5 wherein the axial dimension of the innermost turn of the coil body is equal to the axial dimension of the outermost turn of the coil body.

7. The coil of claim 5, wherein the maximum height of the coil body is 4/3 to 8/5 of the height of the wire in a natural state.

8. The coil of claim 5, wherein the coil body comprises N turns, and the turn located innermost of the coil body is the 1 st turn; the highest point of the coil body is positioned on the nth coil, the ratio of N to N is 0.2-0.4, and N and N are integers greater than 1.

9. The coil according to any one of claims 1 to 8, wherein adjacent two of the spiral turns of the coil body are at least partially coincident in the axial direction, and the coil body has a void; the coil further includes an encapsulation structure filling the void and wrapping the coil body.

10. A handle comprising a housing and a coil according to any one of claims 1-9, said coil being disposed inside said housing.

11. An electromagnetic generating device comprising a host and the handle of claim 10, wherein the host is electrically connected to the coil and is configured to cause the coil to generate a magnetic field.

12. A coil winding method for winding the coil according to claim 1, characterized in that the coil manufacturing method comprises the steps of:

providing a wire, wherein the wire is formed by braiding a plurality of strands of sub-wires;

spirally winding the wire onto a mandrel, and applying a pulling force to the wire to straighten the wire and controlling the pulling force to increase from a first predetermined value to a second predetermined value during the winding process so that the wire forms the coil body; the method comprises the steps of,

the coil body is separated from the mandrel.

13. The coil winding method according to claim 12, wherein the first predetermined value is 60N to 120N and the second predetermined value is 100N to 200N.

14. The method of winding a coil according to claim 12, wherein during the winding, an end of the wire away from the mandrel is held at a predetermined position and the mandrel is controlled to spin, and further wherein the mandrel is controlled to move a predetermined distance in a first direction and then to move the predetermined distance in a second direction opposite to the first direction, the first direction and the second direction being parallel to each other in an axial direction of the mandrel.

15. The coil winding method of claim 14, wherein the mandrel moves in the first direction at a first rate and moves in the second direction at a second rate, the first rate being greater than the second rate.

16. The coil winding method according to any one of claims 12 to 15, wherein adjacent two spiral turns of the coil body are at least partially overlapped in an axial direction, and the coil body has a gap;

the coil manufacturing method further includes filling the gap of the coil body with an encapsulation material, and causing the encapsulation material to encapsulate the coil body.

17. A coil winding apparatus for preparing the coil of claim 1, wherein the coil winding apparatus comprises a mandrel, a first drive mechanism, and a pull wire mechanism; wherein,,

the mandrel is provided with a positioning groove, the positioning groove is used for fixing one end of a wire, and the wire is formed by braiding a plurality of strands of sub-wires;

the first driving mechanism is connected with the mandrel and used for driving the mandrel to rotate so as to spirally wind the wire on the mandrel;

the wire pulling mechanism is used for being connected with the wire and is configured to apply a pulling force to the wire in the winding process so as to straighten the wire, and the pulling force is gradually increased from a first preset value to a second preset value.

18. The coil winding apparatus of claim 17, further comprising a second drive mechanism coupled to the mandrel;

the second driving mechanism is used for driving the mandrel to move a preset distance along a first direction at a first speed in the winding process, and then moving the mandrel along a second direction at a second speed for the preset distance; the first direction and the second direction are parallel to the axial direction of the mandrel, and the first direction is opposite to the second direction, and the first speed is greater than the second speed.

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