A semi-rigid wear-resistant flame-retardant PVDF heat shrink tubing

Abstract

The present invention discloses a semi-rigid wear-resistant and flame-retardant PVDF heat shrinkable tube, which relates to the technical field of heat shrinkable tubes. During heat shrinkage, a large heat shrinkable ring and a small heat shrinkable ring shrink integrally with the heat shrinkable tube body, and the reinforced heat shrinkable strip is a double-walled material with glue, and its deformation amount is greater than the deformation amount of the heat shrinkable tube body during heat shrinkage. Therefore, the three reinforced heat shrinkable strips with larger deformation amounts will exert a pulling force toward the middle on the large heat shrinkable ring and the small heat shrinkable ring to counteract the shrinkage force at both ends of the heat shrinkable tube body, so that the heat shrinkable tube body, which would shrink to both sides, no longer shrinks but moves toward the middle, thereby pulling the inclined surface formed by heat shrinkage into a vertical shape matching the interface of the wire body, so that the heat shrinkable tube body can fit as closely as possible to the outer wall of the wire body, so that it approaches the right-angle docking shape of the wire body, and has a high degree of integration. In addition, it should be emphasized that, like the prior art, the present solution also adopts a relatively simple single-layer design, and does not design a multi-layer structure, which is convenient for production.

Description

Technical Field

[0001] The invention relates to the technical field of heat shrinkable tubes, in particular to a semi-rigid wear-resistant and flame-retardant PVDF heat shrinkable tube. Background Art

[0002] In the actual application of heat shrink tubing, there is another situation where it is wrapped around the wire interface to strengthen the connection and high-efficiency insulation protection. The wire interface often has a drop between the large-diameter wire and the small-diameter wire. After the existing heat shrink tubing shrinks in the wire diameter drop area, the drop end will be tightened into an inclined surface due to the heat shrinkage at both ends (see the attached analysis for a specific analysis). Figure 1 ), resulting in the formation of a hollow area inside, while the inclined surface is in a taut state and has a limited amount of deformation. Therefore, when the heat shrink tube is bent along with the wire body, the inclined surface of the heat shrink tube is very likely to undergo irreversible deformation or damage.

[0003] In view of the above problems, it is urgent to carry out innovative design based on the original heat shrink tube. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a semi-rigid wear-resistant and flame-retardant PVDF heat shrinkable tube to solve the problem proposed in the above background technology that after the existing heat shrinkable tube is heat-shrunk in the diameter drop area of ​​the wire body, the heat shrinkage at both ends will tighten the drop end into an inclined surface, resulting in the formation of a hollow area inside, and the inclined surface is in a taut state and has a limited amount of deformability. Therefore, when the heat shrinkable tube is bent along with the wire body, the inclined surface of the heat shrinkable tube is very likely to undergo irreversible deformation or breakage.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a semi-rigid wear-resistant and flame-retardant PVDF heat shrink tube, comprising a heat shrink tube body, the inner wall of the heat shrink tube body is provided with a large heat shrink ring, and a reinforced heat shrink strip is connected to one side of the large heat shrink ring at an equal angle, and a small heat shrink ring is connected to the end of the reinforced heat shrink strip.

[0006] Preferably, the large heat shrink ring, the reinforced heat shrink strip and the small heat shrink ring are all embedded in the inner wall of the heat shrink tube body.

[0007] Preferably, the small heat shrink ring and the large heat shrink ring are made of the same material as the heat shrink tube body, and the large heat shrink ring, the reinforced heat shrink strip and the small heat shrink ring are all made of heat shrink material.

[0008] Preferably, the number of the small heat shrink rings corresponding to the reinforced heat shrink strips is designed to be equally divided.

[0009] Preferably, a corrugated tactile mark is provided on the outer wall of the heat shrink tube body at a position corresponding to the internal large heat shrink ring.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In this solution, a large heat shrink ring, a reinforced heat shrink strip and a small heat shrink ring are respectively arranged inside the heat shrink tube body, wherein the large heat shrink ring, the reinforced heat shrink strip and the small heat shrink ring are all embedded in the inner wall of the heat shrink tube body, and the large heat shrink ring is fixedly connected to the three separate small heat shrink ring parts through three reinforced heat shrink strips distributed at equal angles, and the heat shrink tube body is sleeved on the interface of the wire body, and a tactile mark is arranged on the outer wall of the heat shrink tube body corresponding to the large heat shrink ring, so that the position of the large heat shrink ring can be judged, and the heat shrink tube body as a whole has a certain flexibility, and the positions of the large heat shrink ring, the reinforced heat shrink strip and the small heat shrink ring can also be distinguished by pressing, so that the three parts of the small heat shrink ring are sleeved on the outer wall of the small-diameter wire body, and the large heat shrink ring is sleeved on the outer wall of the large-diameter wire body.

[0012] During heat shrinkage, the large heat shrink ring and the small heat shrink ring are made of the same material as the heat shrink tube body, so they will shrink in an integrated manner. The reinforced heat shrink strip is made of double-walled material with glue, so the deformation of the reinforced heat shrink strip during heat shrinkage will be greater than the deformation of the heat shrink tube body. Comparative analysis Figure 1 When the middle heat shrink tube body shrinks and retracts to both sides, the three reinforced heat shrink strips with larger deformation will exert a pulling force on the large heat shrink ring and the small heat shrink ring toward the middle to counteract the shrinkage force at both ends of the heat shrink tube body, so that the heat shrink tube body that would shrink to both sides will no longer shrink but move closer to the middle, thereby pulling the inclined surface formed by the heat shrinkage into a vertical shape that matches the interface of the wire body, so that the heat shrink tube body can fit as closely as possible to the outer wall of the wire body, making it close to the right-angle docking shape of the wire body, with a high degree of integration. At the same time, the structural strength of the heat shrink tube body at the interface of the wire body is enhanced to avoid damage to the heat shrink tube body caused by the bending of the wire body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stress analysis of the hollow area formed by stretching at both ends of the heat shrinkable tube in the application field and a schematic diagram of the appearance after heat shrinkage;

[0014] Figure 2 It is a front view structural schematic diagram of the small heat shrink ring of the present invention in an un-heat-shrunk state;

[0015] Figure 3 It is a front view structural schematic diagram of the small heat shrinkable ring after heat shrinkage and merging of the present invention;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the small heat shrinkable rings after heat shrinkage and merging of the present invention;

[0017] Figure 5 It is a schematic diagram of the front cross-sectional structure of the present invention before heat shrinkage;

[0018] Figure 6 It is a schematic diagram of the front cross-sectional structure after heat shrinkage of the present invention;

[0019] Figure 7 It is a schematic diagram of the three-dimensional structure after heat shrinkage of the present invention.

[0020] In the figure: 1. Heat shrink tube body; 2. Large heat shrink ring; 3. Reinforced heat shrink strip; 4. Small heat shrink ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-7 The present invention provides a technical solution: a semi-rigid wear-resistant and flame-retardant PVDF heat shrinkable tube, comprising a heat shrinkable tube body 1, the inner wall of the heat shrinkable tube body 1 is provided with a large heat shrinkable ring 2, and one side of the large heat shrinkable ring 2 is connected with a reinforced heat shrinkable strip 3 at an equal angle, and the end of the reinforced heat shrinkable strip 3 is connected with a small heat shrinkable ring 4.

[0023] The large heat shrink ring 2 , the reinforced heat shrink strip 3 and the small heat shrink ring 4 are all embedded in the inner wall of the heat shrink tube body 1 .

[0024] The small heat shrink ring 4 and the large heat shrink ring 2 are made of the same material as the heat shrink tube body 1 , and the large heat shrink ring 2 , the reinforced heat shrink strip 3 and the small heat shrink ring 4 are all made of heat shrink material.

[0025] The small heat shrink ring 4 corresponds to the number of reinforced heat shrink strips 3 and is designed to be equally divided.

[0026] A corrugated tactile mark is provided on the outer wall of the heat shrink tube body 1 at a position corresponding to the internal large heat shrink ring 2 .

[0027] Embodiment: When using the semi-rigid wear-resistant flame-retardant PVDF heat shrink tube, firstly, the stress analysis of the technical problem of this solution is carried out, such as Figure 1 As shown, there is a wire body with a diameter drop area in the center. When a traditional heat shrink tube is sleeved on the diameter drop area and is fully heated by a hot air blower, the heat shrink tube sleeved on the small diameter wire body will shrink in both directions with its own center point. Similarly, the heat shrink tube sleeved on the large diameter wire body will shrink in both directions with its own center point. For the heat shrink tube at the drop point, its two ends are respectively subjected to reverse stretching. Therefore, the heat shrink tube at the drop point will gradually stretch and tighten to form an inclined surface under the stretching action at both ends, resulting in the formation of a hollow area between the heat shrink tube and the wire body. In addition, the tight inclined heat shrink tube has low strength and small deformability. Once it is bent along with the wire body, the heat shrink tube in the inclined surface area will cause irreversible deformation.

[0028] In view of the above situation, the solution of this plan is: Figure 2 and Figure 5 As shown, a large heat shrink ring 2, a reinforced heat shrink strip 3 and a small heat shrink ring 4 are respectively arranged inside the heat shrink tube body 1. The large heat shrink ring 2, the reinforced heat shrink strip 3 and the small heat shrink ring 4 are all embedded in the inner wall of the heat shrink tube body 1, and the large heat shrink ring 2 is fixedly connected with the three separated small heat shrink ring 4 parts through three reinforced heat shrink strips 3 distributed at equal angles. The heat shrink tube body 1 is sleeved on the interface of the wire body, and the outer wall of the heat shrink tube body 1 corresponding to the large heat shrink ring 2 is provided with a tactile mark, so the position of the large heat shrink ring 2 can be judged, and the heat shrink tube body 1 as a whole has a certain flexibility, and the positions of the large heat shrink ring 2, the reinforced heat shrink strip 3 and the small heat shrink ring 4 can also be distinguished by pressing, so that the three parts of the small heat shrink ring 4 are sleeved on the outer wall of the small diameter wire body, and the large heat shrink ring 2 is sleeved on the outer wall of the large diameter wire body.

[0029] Then, the heat shrink tube body 1 is evenly heated by a hot air blower. During heat shrinkage, the large heat shrink ring 2 itself will shrink integrally with the heat shrink tube body 1, and the three parts of the small heat shrink ring 4 will also shrink integrally with the heat shrink tube body 1. However, the difference is that since the three parts of the small heat shrink ring 4 are sleeved on the small diameter wire body, the corresponding heat shrink tube body 1 shrinks more, and the three parts of the small heat shrink ring 4 can be made of Figure 2 The open form changes to Figure 3 , Figure 4 and Figure 6 The combined form shown in the figure, at the same time, the large heat shrink ring 2 and the small heat shrink ring 4 are made of the same material as the heat shrink tube body 1, so they can achieve integrated shrinkage, and the reinforced heat shrink strip 3 is a double-walled material with glue (the outer layer of the double-walled material with glue is made of high-quality cross-linked polyolefin material, and the inner layer is made of hot melt adhesive composite processing. Compared with ordinary heat shrinkable materials, the heat shrinkage rate is higher. Ordinary heat shrinkable materials generally have only 2:1, while the double-walled heat shrinkable material with glue has 3:1 and 4:1, and can even be as high as 6:1, and its heat shrinkage coefficient is higher). Therefore, during heat shrinkage, the deformation of the reinforced heat shrink strip 3 will be greater than the deformation of the heat shrink tube body 1. Comparative analysis Figure 1 When the middle heat shrink tube body 1 shrinks, it retracts to both sides. The three reinforced heat shrink strips 3 with larger deformation will exert a pulling force on the large heat shrink ring 2 and the small heat shrink ring 4 toward the middle to counteract the shrinkage force at both ends of the heat shrink tube body 1, so that the heat shrink tube body 1 that would shrink to both sides will no longer shrink but move closer to the middle, thereby pulling the inclined surface formed by heat shrinkage into a vertical shape that matches the interface of the wire body (compared with the improvement before Figure 1 and the improved Figure 7), so that the heat shrink tube body 1 can fit as closely as possible to the outer wall of the wire body, making it close to the right-angle docking shape of the wire body, with a high degree of integration. At the same time, the structural strength of the heat shrink tube body 1 at the wire body interface is enhanced to avoid damage to the heat shrink tube body 1 caused by the bending of the wire body.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A semi-rigid wear-resistant flame-retardant PVDF heat shrinkable tube, comprising a heat shrinkable tube body (1), characterized in that: The inner wall of the heat shrinkable tube body (1) is provided with a large heat shrinkable ring (2), and a reinforced heat shrinkable strip (3) is connected to one side of the large heat shrinkable ring (2) at an equal angle, and a small heat shrinkable ring (4) is connected to the end of the reinforced heat shrinkable strip (3); The large heat shrink ring (2), the reinforced heat shrink strip (3) and the small heat shrink ring (4) are all embedded in the inner wall of the heat shrink tube body (1); The small heat shrink ring (4) and the large heat shrink ring (2) are made of the same material as the heat shrink tube body (1), and the large heat shrink ring (2), the reinforced heat shrink strip (3) and the small heat shrink ring (4) are all made of heat shrink material; The number of the small heat shrink rings (4) corresponding to the reinforced heat shrink strips (3) is designed in equal parts; The reinforced heat shrink strip is made of double-walled material with glue. During heat shrinkage, the deformation of the reinforced heat shrink strip will be greater than the deformation of the heat shrink tube body.

2. The semi-rigid wear-resistant flame-retardant PVDF heat shrinkable tube according to claim 1, characterized in that: A corrugated tactile mark is provided on the outer wall of the heat shrink tube body (1) at a position corresponding to the internal large heat shrink ring (2).

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