Self-sensing tension regulating slip magnetic floating air inflation mechanism

Abstract

The present application relates to a kind of self-induction tension adjustment slip magnetic floating air inflation mechanism, including inner rotating ring and outer rotating ring, the outer rotating ring is sleeved in the outer rotating ring, there is air gap between the outer rotating ring and the inner rotating ring, relative free rotation between them;The outer rotating ring includes magnetic tension adjustment unit;The inner rotating ring includes conductor ring and magnetic floating air inflation form air inflation unit, the conductor ring and the air inflation unit are axially arranged side by side;When slip rotation occurs, magnetic tension adjustment unit can realize the adjustment of tension by adjusting speed difference, and the air inflation unit of magnetic floating air inflation form realizes the air inflation work of non-contact, magnetic tension adjustment unit combines magnetic floating air inflation and realizes the non-friction between inner and outer rotating ring, with long life, high stability, maintenance-free effect.

Description

Technical Field

[0001] This invention relates to a slip shaft for a membrane material slitting device, and more particularly to a self-sensing tension-adjustable slip magnetic levitation air expansion mechanism. Background Technology

[0002] A slitting machine is used to slit single rolls of thin material (such as polymer film, paper, fabric, etc.) into multiple strips, and then winds each strip onto an independent core with precisely controlled tension. Due to differences in material thickness or uniformity, variations in winding tension occur among the rolls during the winding and stacking process. This results in differences in the diameter of each roll after winding, leading to uneven internal stress, inconsistent roll tightness, and irregular cross-sections. After a period of environmental aging, the wound material will exhibit geometric and dimensional defects such as looseness and bending during the application process, thus reducing material utilization and the yield of downstream products. To solve this problem, industrial applications often use mechanical slip-ring winding devices for film winding. The principle involves installing multiple slip rings on the winding shaft. Each slip ring independently compensates for tension differences by slipping, ideally maintaining constant tension during winding of multiple rolls on the shaft.

[0003] The existing industrial solutions mostly employ mechanical slip devices. These devices use multiple pistons to apply mechanical friction through air pressure to the outer ring mechanism or control the tension of a motor-driven magnetic powder device. This friction dampens the winding of the outer ring mechanism, thus altering and controlling the winding tension. Clearly, the negative friction generated by this mechanical slip is limited by the piston's wear resistance (hardness, heat resistance, environmental corrosion resistance), the surface finish of the piston contact surface, the rigidity, heat resistance, and wear resistance of the piston seal, the geometric and surface finish of the piston cylinder, and the accuracy and responsiveness of the air pressure control.

[0004] To address the aforementioned shortcomings, another type of damping adjustable electromagnetic slip ring device achieves slip ring control by generating control force electromagnetically instead of through compressed air, electromagnetic force, or magnetic powder, thus improving control accuracy. However, each slip ring requires an independent current for control. In actual production, multiple slip rings are usually connected in series, but an excessive number of slip rings results in a bulky slip ring brush structure and a large number of wires. In addition to the complex power supply structure, controlling the slip ring through current consumes too much of the programmable logic controller (PLC) interface, increasing PLC resource costs.

[0005] Regarding the air expansion function, air pressure is generally used to push the piston, causing the expansion key to extend out of the shaft and support the inner wall of the core, thus fixing the rolled material on the slitting equipment. Currently, the slip differential air expansion device is limited by the structure of the existing electromagnetic slip differential device, making it impossible to achieve a good integration. Therefore, only the more common mechanical slip differential device can be used. Compared with electromagnetic control, mechanical slip differential has more drawbacks.

[0006] Therefore, this application requires a slip air expansion mechanism that can combine electromagnetic slip control with a magnetic air expansion device. Summary of the Invention

[0007] In view of the above situation, it is necessary to provide a self-sensing tension-adjusting slip magnetic levitation air expansion mechanism that solves at least one of the above problems.

[0008] A self-sensing tension-adjustable slip differential magnetic levitation air expansion mechanism includes an inner rotating ring and an outer rotating ring, wherein the outer rotating ring is sleeved outside the inner rotating ring, and there is an air gap between the outer rotating ring and the inner rotating ring, allowing them to rotate freely relative to each other.

[0009] The outer rotating ring includes a tension adjustment unit;

[0010] The inner rotating ring includes a conductor ring and an air expansion unit, wherein the conductor ring and the air expansion unit are arranged side by side axially.

[0011] The tension adjustment unit is a magnetic tension adjustment unit. The magnetic field lines of the tension adjustment unit are orthogonal to the conductor ring. When the inner rotating ring and the outer rotating ring rotate relative to each other, the conductor ring of the inner rotating ring cuts the magnetic field lines, and a Foucault current is generated inside the conductor ring.

[0012] The air expansion unit is a magnetic levitation air expansion type, including an air guide ring, whose air passage is connected to the air supply passage of the main shaft. A piston is installed in the air passage, a first magnet is installed on the end of the piston facing the expansion key, and a second magnet is installed on the end of the expansion key facing the piston. The magnetic poles of the first magnet and the second magnet are opposite, and the first magnet and the second magnet are spatially opposite to each other.

[0013] As a further aspect of the present invention: the tension adjusting unit includes a magnet ring and a plurality of magnets disposed on the magnet ring;

[0014] The magnets are distributed circumferentially on the magnet ring.

[0015] As a further aspect of the present invention: the number of magnets is a positive integer multiple of three, four, or six;

[0016] The magnetic poles of the magnet are arranged according to the Heilbeck array principle.

[0017] As a further solution of the present invention: It further includes a main shaft, and the inner rotating ring is fixedly arranged on the main shaft;

[0018] The outer rotating ring is arranged on the main shaft through two bearings;

[0019] The cross-section of the outer rotating ring is in the shape of a "冂" character, and the inner rotating ring is wrapped therein, and the two bearings are arranged at the supporting feet of the outer rotating ring.

[0020] As a further solution of the present invention: A circular spring is further arranged on the outer side of the outer rotating ring, and the circular spring is sleeved on the expansion key to provide a retracting force for the expansion key.

[0021] As a further solution of the present invention: All the expansion keys at the same circumferential position on the outer rotating ring are held by one circular spring;

[0022] On the outer rotating ring and the expansion keys in this circumferential direction, grooves are arranged in a circumferential distribution, and the circular spring is stuck in the grooves.

[0023] As a further solution of the present invention: There are several pistons in the air expansion unit, which are evenly distributed on the air guide ring in an annular array. The number of pistons is a positive integer multiple of the number of expansion keys, and the number of pistons corresponding to each expansion key is the same.

[0024] As a further solution of the present invention: On the circumference of the end of the piston far from the first magnet, a rubber ring mounting part is arranged. The rubber ring mounting part protrudes to form a stepped structure with a groove, and a rubber ring is arranged in the groove. The rubber ring is closely attached to the inner wall of the air passage to achieve sealing;

[0025] A spring is arranged between the rubber ring mounting part and the air guide ring. Under the elastic force of the spring, the piston is at the lower dead center position when the air expansion unit does not introduce compressed gas.

[0026] As a further solution of the present invention: When all the expansion keys are at the lower dead center, all the fan-shaped ring parts can form a complete ring;

[0027] The number of the second magnets is at least one, and the second magnets cover the inner edge of the fan-shaped ring part.

[0028] The above self-inductive tension-adjusting slip magnetic levitation air expansion mechanism adopts a magnetic tension-adjusting method, combines a magnetic levitation air expansion unit, realizes the frictionless rotation of the inner and outer rotating rings when generating slip, and has the advantages of no need for lubrication and maintenance, high integration of the mechanism, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the first structural schematic diagram of an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the second structure according to an embodiment of the present invention;

[0031] Figure 3 This is a comparison diagram of the locking direction of magnet 212 in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] This invention provides a self-sensing tension-adjustable slip-gauge magnetic levitation air expansion mechanism, referenced. Figures 1-3 As shown, it includes an inner rotating ring 100 and an outer rotating ring 200. The outer rotating ring 200 is fitted over the inner rotating ring 100. There is an air gap between the outer rotating ring 200 and the inner rotating ring 100, allowing them to rotate freely relative to each other. Because of the air gap, there is no relative sliding friction between them. Compared with traditional mechanical slip control, there is no mechanical wear, the overall stability is better, and it can even achieve maintenance-free operation. Furthermore, by utilizing the principle of magnetic slip control, tension self-compensation is achieved, resulting in a more agile response.

[0036] The inner rotating ring 100 includes a conductor ring 110 and an air expansion unit 120; the outer rotating ring 200 includes a tension adjustment unit 210. The air expansion unit 120 adopts a magnetic levitation air expansion, that is, the piston 122 and the expansion key 220 are connected by a magnet to achieve the transmission of thrust, so that there is no contact between the piston 122 and the expansion key 220. Combined with magnetically controlled slip, the inner and outer rotating rings achieve no contact and no friction, which has the technical effects of long life, high stability and no maintenance.

[0037] The tension adjustment unit 210 is a magnetic tension adjustment unit. The magnetic field lines of the tension adjustment unit 210 are orthogonal to the conductor ring 110. When the inner rotating ring 100 and the outer rotating ring 200 rotate relative to each other, the conductor ring 110 cuts the magnetic field lines, generating a Foucault current inside the conductor ring 110. This magnetic induction generates a driving force, causing the outer rotating ring 200 to rotate following the inner rotating ring 100. The magnitude of this driving force depends on the magnetic flux of the tension adjustment unit 210. Of course, the magnetic flux of the tension adjustment unit can be adjusted by adjusting the magnet, allowing for customized design based on the required tension. During operation, when the tension of the wound material exceeds this fixed driving force, slippage will occur between the outer rotating ring and the inner rotating ring, i.e., slippage.

[0038] The air expansion unit 120 includes an air guide ring 121, whose air passage is connected to the air supply passage of the main shaft. A piston 122 is installed in the air passage. When air is supplied, the piston 122 is pushed out, indirectly controlling the expansion key 220 on the outer rotating ring 200, causing it to be pushed out.

[0039] Furthermore, the tension adjustment unit 210 includes a magnet ring 211 and a plurality of magnets 212 disposed on the magnet ring 211; considering volume constraints, a circumferentially indexed magnetization method is adopted, which can reduce the space occupied in the axial direction; in this embodiment, the magnets 212 are evenly distributed in a circular array on the magnet ring 211.

[0040] Furthermore, the number of magnets 212 is a positive integer multiple of three, four, or six. The aforementioned number of magnets 212 and the distribution of magnetic poles are implemented based on the Hellbeck array principle, which can enhance the magnetic field strength in a certain direction, so that a limited number of magnets can provide a greater magnetic field strength in the effective magnetic direction within a fixed space. For example, in this application, it is necessary to enhance the magnetic field strength in the direction of the conductor ring 110 with magnets 212. The magnets 212 arranged according to the Hellbeck array principle can increase the magnetic field strength in a specified direction with the same number of magnets 212. The most intuitive manifestation of this in the tension adjustment unit 210 is that it can effectively reduce the volume occupied by the magnets 212, which helps to optimize the overall structural design.

[0041] In this application, the magnet 212 has two arrangement forms, such as Figure 3As shown, the magnets 212 in both configurations are rotated 90°. Viewed from the axial cross-section, the first configuration is longitudinally mounted, while the second is horizontally mounted. Correspondingly, these two configurations have a certain impact on the diameter and length of the slip-ring magnetic levitation air-expansion mechanism. The dashed lines in the figure indicate the direction of the screw holes on the magnet 212.

[0042] Furthermore, a first magnet 123 is provided at the end of the piston 122 facing the expansion key 220, and correspondingly, a second magnet 221 is provided at the end of the expansion key 220 facing the piston 122. The magnetic poles of the first magnet 123 and the second magnet 221 are opposite, that is, the same magnetic poles are opposite each other, and the first magnet 123 and the second magnet 221 are spatially aligned, so that there is a repulsive force between the piston 122 and the expansion key 220.

[0043] Furthermore, the number of pistons 122 should be greater than the number of expansion keys 220. This is because during slippage, the positions of the expansion keys 220 and pistons 122 will shift relative to each other. It is necessary to ensure that the thrust of the pistons 122 on the expansion keys 220 is stable, meaning that at different rotation angles, the same number of pistons 122 correspond to each expansion key 220, ensuring uniform tension on the cylinder core by each expansion key 220. When one expansion key 220 corresponds to multiple pistons 122, the end of the expansion key 220 facing the piston 122, i.e., the bottom end, is fan-shaped. The second magnet 221 is located in the fan-shaped portion, and the fan-shaped arrangement matches the structure of the outer rotating ring. Its function is to increase the area for accommodating multiple pistons 122. When the expansion key 220 is at the bottom dead center position, the fan-shaped portions of multiple expansion keys 220 together form a complete ring.

[0044] Furthermore, based on the quantity and distribution relationship between the piston 122 and the expansion key 220, there are two ways to arrange the first magnet 123 and the second magnet 221, the main difference being the number of the second magnet 221. Firstly, the number of the second magnet 221 is the same as the number of expansion keys 220, with only one second magnet 221 on each expansion key 220, completely covering the inner edge of the fan ring of the expansion key 220. Secondly, the number of the second magnet is at least one, and the second magnet covers the inner edge of the fan ring portion. Both forms are similar in that they need to completely cover the inner edge of the fan ring, forming a complete magnetic ring when the expansion key 220 reaches its bottom dead center position.

[0045] Further, a rubber ring is provided at the bottom of the piston 122. The part where the rubber ring is provided protrudes from the piston 122, forming a small stepped structure on the piston 122 for sealing the air passage of the air expansion unit 120. When the air expansion unit 120 is ventilated, compressed gas enters from the main shaft, enters the air passage, and pushes up the piston 122. The piston spring is provided on the piston 122. One end of the piston spring abuts against the step where the rubber ring is installed, and the other end abuts against the cover plate on one side of the piston top. When the piston 122 extends, the piston spring is compressed. When the air expansion unit 120 is not ventilated, the piston spring resets. Under the elastic force of the piston spring, the piston 122 will move to the bottom dead center.

[0046] Since the first magnet and the second magnet are used to realize the ejection of the expansion key 220, the ejection force depends on the number (magnetic field strength) of the first magnet and the second magnet set and the pressure of the compressed gas. It is easy to know that when the same magnetic poles of the two magnets are close to each other, the smaller the distance, the greater the interaction force. Therefore, before the expansion key 220 reaches the top dead center, the pressure of the expansion key 220 on the core depends on the magnitude of the pressure of the compressed gas introduced. After the expansion key 220 reaches the top dead center, the pressure of the expansion key 220 on the core will no longer increase, but the interaction force between the piston 122 and the expansion key 220 can still increase, that is, the stability of the expansion key 220 in the tightening operation can be regarded as increased.

[0047] Further, the air expansion mechanism further includes a main shaft, and the inner rotating ring 100 is fixedly arranged on the main shaft;

[0048] The outer rotating ring 200 is arranged on the main shaft through two bearings 250;

[0049] The cross-section of the outer rotating ring 200 is in the shape of a "冂", and the inner rotating ring 100 is wrapped therein. The two bearings 250 are arranged at the feet of the outer rotating ring 200.

[0050] Further, a ring spring 260 is further provided on the outer side of the outer rotating ring 200. The ring spring 260 is hoop-shaped on the expansion key 220 to provide a retracting force for the expansion key 220.

[0051] Further, all the expansion keys 220 at the same circumferential position on the outer rotating ring 200 are hoop-shaped by a ring spring 260;

[0052] On the outer rotating ring 200 and the expansion key 220 in this circumferential direction, grooves are provided along the circumferential direction, and the ring spring 260 is stuck in the grooves. When the air expansion unit 120 releases the control of the expansion key 220, under the elastic force of the ring spring 260, the protruding expansion key 220 is pressed back into the outer rotating ring 200.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism, characterized in that: It includes an inner rotating ring and an outer rotating ring. The outer rotating ring is sleeved outside the inner rotating ring. There is an air gap between the outer rotating ring and the inner rotating ring, and they can rotate freely relative to each other. The outer rotating ring includes a tension adjusting unit. The inner rotating ring includes a conductor ring and a pneumatic expansion unit. The conductor ring and the pneumatic expansion unit are arranged side by side axially. The tension adjusting unit is a magnetic tension adjusting unit. The magnetic induction lines of the tension adjusting unit are orthogonal to the conductor ring. When the inner rotating ring and the outer rotating ring rotate relatively, the conductor ring of the inner rotating ring cuts the magnetic induction lines, and Foucault currents are generated inside the conductor ring. The pneumatic expansion unit is in the form of magnetic levitation pneumatic expansion, including a gas guiding ring. Its air duct is connected to the air supply air duct of the main shaft. A piston is arranged in the air duct. A first magnet is arranged at the end of the piston facing the expansion key. A second magnet is arranged at the end of the expansion key facing the piston. The magnetic pole directions of the first magnet and the second magnet are opposite, and the first magnet and the second magnet are directly opposite in space.

2. The self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism as described in claim 1, characterized in that: The tension adjusting unit includes a magnet ring and a number of magnets arranged on the magnet ring. The magnets are circumferentially distributed on the magnet ring.

3. The self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism as described in claim 2, characterized in that: The number of the magnets is a positive integer multiple of three, four or six. The distribution direction of the magnetic poles of the magnets is arranged according to the principle of Halbach array.

4. The self-sensing tension-adjustable slip-gauge magnetic levitation air expansion mechanism as described in claim 1, characterized in that: It further includes a main shaft. The inner rotating ring is fixedly arranged on the main shaft. The outer rotating ring is arranged on the main shaft through two bearings. The cross section of the outer rotating ring is in the shape of "冂", covering the inner rotating ring therein. The two bearings are arranged at the feet of the outer rotating ring.

5. The self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism as described in claim 4, characterized in that: A circular spring is further arranged on the outside of the outer rotating ring. The circular spring is hoop-shaped on the expansion key, providing a retracting force for the expansion key.

6. The self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism as described in claim 5, characterized in that: All the expansion keys at the same circumferential position on the outer rotating ring are hoop-shaped by one circular spring. On the outer rotating ring and the expansion keys in this circumferential direction, grooves are arranged circumferentially. The circular spring is stuck in the grooves.

7. The self-sensing tension-adjustable slip-gauge magnetic levitation air expansion mechanism as described in claim 1, characterized in that: There are several pistons in the pneumatic expansion unit, which are evenly distributed in an annular array on the gas guiding ring. The number of the pistons is greater than the number of the expansion keys.

8. The self-sensing tension-adjustable slip-gauge magnetic levitation air expansion mechanism as described in claim 7, characterized in that: A rubber ring mounting part is arranged on the circumference at the end of the piston far from the first magnet. The rubber ring mounting part protrudes, forming a stepped structure with a groove. A rubber ring is arranged in the groove, and the rubber ring is close to the inner wall of the air duct to achieve sealing. A spring is arranged between the rubber ring mounting part and the gas guiding ring. Under the elastic force of the spring, the piston is at the lower dead point position when no compressed gas is introduced into the pneumatic expansion unit.

9. The self-sensing tension-adjustable slip-gauge magnetic levitation air-expansion mechanism as described in claim 7, characterized in that: One end of the expansion key close to the piston is in a fan-shaped ring shape, and the second magnet is arranged at the fan-shaped ring part. When all the expansion keys are at the lower dead point, all the fan-shaped ring parts can form a complete ring. The number of the second magnets is at least one, and the second magnets cover the inner edge of the fan-shaped ring part.

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