Constant tension winding device for heat shrink sleeve production

Abstract

The present application belongs to the technical field of heat shrink sleeve production equipment, and particularly relates to a constant tension winding device for heat shrink sleeve production, which comprises a base, three supporting plates integrally formed above the base, a winding wheel rotatably connected between one of the supporting plates, a heat shrink tube wound on the winding wheel, and a tension wheel fixedly connected between the other two supporting plates. Through the cooperation of the structure, the axial reciprocating wire arrangement, regular dynamic alternating tension, and differential tension control with large intermediate tension and small tension on both sides are realized in sequence, and the winding state of sparse winding in the middle and tight winding on both sides is formed. The taper of the taper plate can be adjusted by rotating the supporting disc to adapt to the winding requirements of heat shrink sleeves of different specifications. The technical problems of single wire arrangement, constant and unadjustable tension, easy wrinkling and warping of the winding material, poor roundness, low quality of finished products, and poor versatility of the equipment are effectively solved.

Description

Technical Field

[0001] This invention belongs to the technical field of heat shrinkable sleeve production equipment, specifically relating to a constant tension winding device for heat shrinkable sleeve production. Background Technology

[0002] Heat shrink tubing (heat shrink sleeve) is widely used in power, electronics, and pipeline corrosion protection fields due to its excellent insulation, sealing, and corrosion protection properties. After extrusion and cooling, the heat shrink tubing needs to be continuously wound by a winding device; the uniformity and tension stability of the winding directly determine the product appearance, storage stability, and subsequent unwinding quality.

[0003] Existing heat shrink sleeve winding equipment has significant shortcomings: Prior art document 1 (CN206857876U) discloses a heat shrink tubing take-up device, which mainly consists of a base, support frame, lifting frame, and take-up reel, and its position is adjusted by a cylinder and a hydraulic cylinder. This device lacks an automatic axial reciprocating cable laying mechanism, and the heat shrink tubing tends to stack in the same axial position, resulting in localized accumulation, uneven interlayer pressure, loose outer layers and tight inner layers, or localized deformation. At the same time, it lacks dynamic tension adjustment capability, with fixed tension throughout the process, poor guide limit, and is prone to deviation, warping, wrinkling, bulging, and low yield.

[0004] Prior art document 2 (CN218809624U) discloses a pipe winding machine with a tension adjustment device, which is equipped with a swing arm assembly and a buffer cylinder to fine-tune the overall tension. However, this device can only provide an approximately constant tension and cannot achieve periodic dynamic tension variation. The inner layer is prone to overstretching, while the outer layer is loose, resulting in poor consistency in tension throughout the roll. Furthermore, it lacks lateral zone tension control and cannot achieve an adaptation mode of "high tension in the middle and low tension at the front and back (both sides)". For thin-walled heat shrink sleeves, the middle is prone to loosening and wrinkling, while the edges are prone to stretching and cracking.

[0005] In addition, conventional equipment cannot simultaneously achieve automatic axial reciprocating winding, regular and fluctuating tension, lateral tension distribution with a large tension in the middle and a small tension on both sides, adaptive density (sparse in the middle and dense on both sides), and convenient tension adjustment. This results in insufficient roundness of the roll material, easy flattening during storage, and loose interlayer misalignment, making it difficult to meet the requirements of large-scale production of high-precision, high-quality heat shrink sleeves.

[0006] Therefore, there is an urgent need to develop a constant tension winding device for the production of heat shrink sleeves that has a reasonable structure, stable operation, and adaptive tension adjustment. Summary of the Invention

[0007] The purpose of this invention is to provide a constant tension winding device for heat shrink tubing production, so as to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a constant tension winding device for heat shrink tubing production, comprising a base, three support plates integrally formed on the upper part of the base, a winding wheel rotatably connected between one of the support plates, and a rolled heat shrink tubing sleeved on the winding wheel; a tension wheel fixedly connected between the other two support plates, the winding wheel being fixedly connected to the output end of an external drive motor, two opposing spiral grooves being formed on the outer side of the tension wheel and interconnected between the two spiral grooves, a roller sleeved on the outer side of the tension wheel, and ball bearings rollingly connected to the inner wall of the roller, the ball bearings rollingly connected within the spiral grooves, the heat shrink tubing being wound around the rolled heat shrink tubing via the roller; two conical plates are inserted inside the roller.

[0009] The present invention further describes that the roller includes a left wheel and a right wheel, and both the left wheel and the right wheel have countersunk holes on their inner sides. A limiting shaft is slidably connected in the countersunk hole and is limited by the limiting shaft; both the left wheel and the right wheel are magnetic and have the same magnetic poles.

[0010] The present invention further illustrates that the inner wall of the support plate rotatably connected to the tension wheel is rotatably connected to a turntable, the inner side of the turntable is threadedly connected to a support plate, the inner side of the support plate is provided with a limiting hole, and the front and rear ends of the conical plate are respectively inserted into the limiting holes of the two support plates.

[0011] The present invention further illustrates that the middle of the conical plate is planar, and the front and rear sides are conical.

[0012] The present invention further illustrates that both the left and right wheels have internal grooves, and sliders are slidably connected to the inner walls of the grooves, with the ball bearings rotatably connected to the sliders.

[0013] The present invention further illustrates that one end of the slider is in contact with the conical plate.

[0014] The present invention further explains that the support plate rotatably connected to the tension wheel is provided with grooves on both the left and right sides, and the turntable is provided with several slots evenly distributed around its perimeter, forming an open structure through the grooves.

[0015] The present invention further illustrates that the slot is used to limit the turntable, and the conical plate is elastic.

[0016] The present invention further illustrates that a slot is provided in the middle of both the left wheel and the right wheel, and a conical plate is inserted into the slot.

[0017] The present invention further illustrates that the slot and the slide are interconnected.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: By setting up a roller winding structure with spiral grooves and ball bearings, the balls roll back and forth along the spiral grooves during the winding process, driving the heat shrink tubing to automatically reciprocate axially. This avoids the heat shrink tubing from being stacked in the same position for a long time, ensuring uniform pressure between the layers of the roll material and eliminating problems such as loose outer layers, tight inner layers, and localized deformation. At the same time, the reciprocating winding can automatically correct material deviation, reduce the probability of heat shrink tubing misalignment and breakage, distribute material evenly layer by layer, and quickly expel air between layers, effectively preventing bulging, air bubbles, and wrinkles in the roll material, and significantly improving the flatness of the heat shrink tubing winding and the yield of finished products. By utilizing the magnetic structure of the left and right wheels repelling each other, combined with the linkage structure of the conical plate, turntable, and support plate, the equipment generates a regular, gradually varying tension during winding. This dynamic alternating tension adapts to the entire winding process, reducing tension in the inner layer to prevent the tube from stretching and breaking, while increasing tension in the outer layer to ensure tight winding. Simultaneously, the fluctuating tension squeezes out residual air between layers, ensuring a tight fit between each heat-shrink sleeve layer. This eliminates problems such as misalignment, shifting, and loosening of the roll material, greatly improving the structural stability of the heat-shrink sleeve after winding and ensuring that the roll material does not loosen or deform during storage and transportation. Through a special conical plate structure with a flat center and tapered ends, a differentiated tension distribution is achieved during the winding process, with high tension in the middle and low tension on the front and back sides. This effectively solves the industry problem of existing equipment being unable to control tension in sections, leading to wavy edges, curling, edge cracks, and loosening and wrinkling in the middle of the heat shrink sleeve. The low tension on both sides prevents the edges of the heat shrink sleeve from being excessively stretched and contracted, protecting the integrity of the side structure of the thin-walled tube; the high tension in the middle tightens the middle area of ​​the tube, eliminating transverse wrinkles, material pockets, and wavy patterns, ensuring that the entire roll of heat shrink sleeve is evenly stressed and formed flat and tight. By utilizing the combination of sliders, ball bearings, and spiral grooves, the rollers rotate faster in the center and slower on the sides, achieving a winding effect where the heat shrink sleeve is sparser in the center and denser on the sides. This overcomes the shortcomings of traditional winding methods, such as poor roundness, easy flattening, edge slippage, and unwinding jams. The tight wrapping on both sides reinforces the overall structure of the roll, improves its roundness and compression resistance, prevents flattening and deformation during storage and transportation, and ensures smooth and stable unwinding without jamming or decoupling issues. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the tension wheel portion of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a schematic diagram of the fit between the conical plate and the roller of the present invention; Figure 5 This is a plan view of the roller of the present invention; Figure 6 This is a plan view of the tension wheel of the present invention; In the diagram: 1. Base; 2. Support plate; 3. Rewinding wheel; 4. Tension wheel; 41. Spiral groove; 42. Ball bearing; 43. Conical plate; 44. Left wheel; 45. Right wheel; 46. Limiting shaft; 47. Slider; 5. Turntable; 51. Slot; 6. Support plate. Detailed Implementation

[0020] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-6 The present invention provides a technical solution: a constant tension winding device for heat shrink tubing production, including a base 1, three support plates 2 integrally formed on the upper part of the base 1, a winding wheel 3 rotatably connected between the support plates 2, and a rolled heat shrink tubing is sleeved on the winding wheel 3. Tension wheel 4 is fixedly connected between the other two support plates 2. The winding wheel 3 is fixedly connected to the output end of the external drive motor. Two opposing spiral grooves 41 are opened on the outer side of the tension wheel 4, and the two spiral grooves 41 are connected to each other. A roller is sleeved on the outer side of the tension wheel 4, and a ball bearing 42 is rolled on the inner wall of the roller. The ball bearing 42 is rolled in the spiral groove 41. The heat shrink tubing is wound around the rolled heat shrink tubing through the roller. Two conical plates 43 are inserted inside the roller; The finished heat shrink tubing is wound up by first stretching one end of the heat shrink tubing to the bottom of the roller, then winding it around the tension wheel 4. An external drive motor is then activated, causing the tension wheel 4 to rotate and pull the heat shrink tubing. Simultaneously, the traction force of the heat shrink tubing pulls the roller to rotate. As the roller rotates, it drives the balls 42 to roll within the spiral grooves 41, generating axial force, thus initiating back-and-forth movement. The balls 42 roll back and forth within the two spiral grooves 41, driving the heat shrink tubing to move back and forth through the roller, ensuring even winding and axial reciprocating winding. This prevents long-term accumulation in the same position, maintains consistent interlayer pressure, reduces "loose outside, tight inside" or "tight outside, loose inside" imbalances, results in uniform roll density, reduces deformation, and ensures consistent edge stress, preventing wrinkles and curling. The even layering allows air to escape easily, reducing bulges and bubbles. Automatic guidance correction significantly reduces the risk of deviation and material breakage.

[0022] The roller includes a left wheel 44 and a right wheel 45, and both the left wheel 44 and the right wheel 45 have countersunk holes on their inner sides. A limit shaft 46 is slidably connected in the countersunk hole and is limited by the limit shaft 46. Both the left wheel 44 and the right wheel 45 are magnetic, and they have the same magnetic poles.

[0023] The tension wheel 4 is rotatably connected to the inner wall of the support plate 2, and the turntable 5 is rotatably connected to the inner side of the turntable 5. The support plate 6 is threadedly connected to the inner side of the support plate 6. Limiting holes are opened on the inner side of the support plate 6. The front and rear ends of the tapered plate 43 are respectively inserted into the limiting holes of the two support plates 6. As the rollers move back and forth, the magnetic repulsion between the left wheel 44 and the right wheel 45 causes them to move away from each other to their extreme positions. Then, as the left wheel 44 and the right wheel 45 move, the turntable 5 and the support plate 6 rotate synchronously through the conical plate 43. At the same time, the left wheel 44 and the right wheel 45 are squeezed by the conical part of the conical plate 43, thus moving inward under force. The left wheel 44 and the right wheel 45 move closer to each other through the limiting shaft 46, and the tension decreases, resulting in a regular and gradual tension that fluctuates between large and small. The tension is appropriately reduced in the inner layer and increased in the outer layer, so that the tightness of the roll is consistent inside and out. The phased fluctuation of tension allows each layer of material to adhere more tightly, squeezing out the air between the layers. The uniform alternating tension makes each layer adhere better, so that the heat shrink tubing is not easy to misalign or move between layers during storage and transportation.

[0024] The middle of the conical plate 43 is flat, while the front and rear sides are conical. Because the middle of the conical plate 43 is flat and the front and rear sides are conical, the tension is high when the left wheel 44 and the right wheel 45 move to the middle position, and when they move to the front and rear sides, they are squeezed by the conical part of the conical plate 43, thus moving inward and reducing the tension. This results in a winding method with high tension in the middle and low tension at the front and rear, which eliminates frilly edges and curling edges. The low tension and weak pull on both sides prevent the heat shrink tubing from being forcibly stretched and contracted on both sides, effectively preventing curling edges, frilly edges, and edge cracks, as well as wrinkling and loosening in the middle. The high tension in the middle keeps the heat shrink tubing taut in the middle, avoiding looseness in the middle, lateral wrinkles, material pocketing, and wavy lines. The middle is tightened and the two sides are relaxed, so the whole roll is evenly stressed, and there will be no bulging in the middle or collapse on both sides. The roll is well-formed and tight.

[0025] Both the left wheel 44 and the right wheel 45 have internal grooves, and the inner walls of the grooves are slidably connected to sliders 47, with ball bearings 42 slidably connected to sliders 47.

[0026] One end of the slider 47 is in contact with the conical plate 43; When the left wheel 44 and right wheel 45 move to the front and rear sides, they are squeezed by the conical part and move inward. At the same time, the slider 47 is squeezed by the conical plate 43, which increases the tightness between the ball 42 and the spiral groove 41. The resistance when the rollers move increases relatively, resulting in the phenomenon that the middle rotates slowly while the front and rear sides rotate slowly. At this time, when the output power of the external drive motor is constant, the gap of the heat shrink tube is large when winding in the middle, and the heat shrink tubes are more tightly bonded when winding on the front and rear sides. The heat shrink tube is rolled up in a state of being sparse in the middle and dense on the sides to maintain roundness, prevent flattening, prevent edge slippage, and facilitate unwinding.

[0027] The tension wheel 4 is rotatably connected to the support plate 2, and both sides are provided with grooves. The turntable 5 is evenly provided with several slots 51 around its perimeter, and is open through the grooves.

[0028] The slot 51 is used to limit the turntable 5, and the tapered plate 43 is elastic; When tension adjustment is required, the operator only needs to use a wrench to insert into the slot 51 through the groove to limit the turntable 5, and then rotate the support plate 6 so that it rotates and moves through the threaded drive, thereby squeezing the conical plate 43. The two support plates 6 squeeze the conical plate 43, causing it to elastically deform, thereby causing the conical plate 43 to deform inward and increase the taper. At this time, when the left wheel 44 and the right wheel 45 move back and forth, the inner conical part moves inward after being squeezed, and the tension decreases more. The adjustment is convenient and quick, and it can be applied to different tension requirements and winding requirements, with a wide range of applications. Meanwhile, when the left wheel 44 and the right wheel 45 move back and forth, the resistance applied by the conical plate 43 is relatively increased, so that while the tension is reduced, the winding density is relatively increased, thereby greatly improving the winding quality, avoiding loosening during subsequent heat shrink tubing transportation, and improving its stability after winding.

[0029] Both the left wheel 44 and the right wheel 45 have slots in the middle, and the tapered plate 43 is inserted into the slots.

[0030] The slots and slides are interconnected; At the same time, when the conical plate 43 deforms inward, its force squeezes the slider 47, which increases the tightness between the ball 42 and the spiral groove 41, and the speed of the roller moving back and forth is greatly reduced, thereby further improving the tightness of winding and further improving the winding quality. The overall structure is simple, easy to disassemble and maintain, and the tapered plate 43 can be quickly replaced to avoid its fatigue reducing its performance.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", 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 this invention, 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 this invention.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A constant tension winding device for heat shrink tubing production, comprising a base (1), characterized in that: The base (1) has three support plates (2) integrally formed on its upper part. One of the support plates (2) is rotatably connected to a winding wheel (3), and a rolled heat shrink tube is sleeved on the winding wheel (3). Tension wheels (4) are fixedly connected between the other two support plates (2). The winding wheel (3) is fixedly connected to the output end of the external drive motor. Two opposing spiral grooves (41) are opened on the outer side of the tension wheel (4), and the two spiral grooves (41) are connected to each other. A roller is sleeved on the outer side of the tension wheel (4), and a ball (42) is rolled on the inner wall of the roller. The ball (42) is rolled in the spiral groove (41). The heat shrink tube is wound around the rolled heat shrink tube by the roller. The roller has two conical plates (43) inserted inside. The roller includes a left wheel (44) and a right wheel (45). The inner sides of the left wheel (44) and the right wheel (45) are provided with countersunk holes. A limit shaft (46) is slidably connected in the countersunk hole and is limited by the limit shaft (46). The left wheel (44) and the right wheel (45) are both magnetic and have the same magnetic poles. The inner wall of the support plate (2) rotatably connected to the tension wheel (4) is connected to a turntable (5). The inner side of the turntable (5) is threaded with a support plate (6). The inner side of the support plate (6) has a limiting hole. The front and rear ends of the conical plate (43) are respectively inserted into the limiting holes of the two support plates (6). The middle of the conical plate (43) is flat, and the front and rear sides are conical. The interior of the left wheel (44) and the right wheel (45) are both provided with a sliding groove, and the inner wall of the sliding groove is slidably connected to a slider (47). The ball (42) is slidably connected to the slider (47).

2. The constant tension winding device for heat shrink sleeve production according to claim 1, characterized in that: One end of the slider (47) is in contact with the conical plate (43).

3. The constant tension winding device for heat shrink sleeve production according to claim 2, characterized in that: The tension wheel (4) is rotatably connected to the support plate (2) with grooves on both sides. The turntable (5) is evenly provided with several slots (51) around its perimeter, and is open through the grooves.

4. The constant tension winding device for heat shrink sleeve production according to claim 3, characterized in that: The slot (51) is used to limit the turntable (5), and the tapered plate (43) is elastic.

5. A constant tension winding device for heat shrink sleeve production according to claim 4, characterized in that: The left wheel (44) and the right wheel (45) are both provided with slots in the middle, and the conical plate (43) is inserted into the slots.

6. A constant tension winding device for heat shrink sleeve production according to claim 5, characterized in that: The slot and the slide are interconnected.

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