Annular corrugated single-wall heat shrink tube, continuous forming process and continuous forming equipment

Abstract

The invention belongs to the field of heat shrink tube forming, and discloses an annular corrugated single-wall heat shrink tube, a continuous forming process and continuous forming device.The continuous forming process comprises the steps that a to-be-expanded tube in a cross-linked state is formed through a cross-linkable high polymer material, and a plurality of open grooves are formed in the inner wall of the to-be-expanded tube in the circumferential direction at intervals; the open groove penetrates through the axial direction of the pipe to be expanded; performing positive pressure expansion on the pipe to be expanded; and carrying out corrugation forming and corrugation shaping on the pipe subjected to positive pressure expansion to form the annular corrugated single-wall heat shrink tube. The annular corrugations are formed on the side wall of the heat shrink tube, so that the annular corrugation single-wall heat shrink tube has the performance of small bending radius and excellent overall flexibility, the open grooves are formed in the inner wall of the heat shrink tube, the exhaust performance of the heat shrink tube can be improved, the annular corrugation single-wall heat shrink tube can be applied to special-shaped rows, and the service life of the heat shrink tube is prolonged. The problems that when a conventional heat shrink tube is applied to the special-shaped bar, tube penetrating is difficult, wrinkles, bumps, bridging and the like occur are solved, and the electrical performance of the copper and aluminum special-shaped bar is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat shrink tube molding, in particular to an annular corrugated single-wall heat shrink tube, a continuous molding process and a continuous molding device. Background Art

[0002] At present, the development momentum of the new energy vehicle industry is strong, which has driven the overall upgrade of the relevant industrial chain. Due to the large-scale use of batteries and the highly integrated intelligent management of battery modules, the frequency of use of copper and aluminum bars in new energy vehicles has increased. At the same time, in order to meet the body space design layout, many special-shaped copper and aluminum bars have been derived. Regular-shaped copper and aluminum bars can be directly shrunk by heat shrink tubing for electrical protection on the surface. However, when encountering special-shaped bars with plane right angles and normal right angles, conventional heat shrink tubing will cause difficulties in pipe threading, wrinkles, bulging and bridging when used on them, affecting the electrical performance of copper and aluminum special-shaped bars. Therefore, it is urgent to design a heat shrink tubing with a small bending radius, excellent overall flexibility and excellent exhaust performance. Summary of the invention

[0003] The purpose of the present invention is to provide an annular corrugated single-wall heat shrinkable tube, a continuous forming process and a continuous forming device, which can form a heat shrinkable tube with a small bending radius, excellent overall flexibility and excellent exhaust performance.

[0004] The technical solution provided by the present invention is as follows:

[0005] On the one hand, a continuous molding process of an annular corrugated single-wall heat shrink tube is provided, comprising:

[0006] A cross-linked tube to be expanded is formed by a cross-linkable polymer material, wherein the inner wall of the tube to be expanded is provided with a plurality of grooves at intervals along the circumferential direction, and the grooves penetrate the axial direction of the tube to be expanded;

[0007] Performing positive pressure expansion on the tubular material to be expanded;

[0008] The tube after positive pressure expansion is subjected to corrugation forming and corrugation shaping to form an annular corrugated single-wall heat shrink tube.

[0009] In some embodiments, the tubular material to be expanded in a cross-linked state formed by the cross-linkable polymer material specifically comprises:

[0010] Select a cross-linkable polymer material and extrude it into a pipe to be expanded with grooves on the inner wall through an extruder;

[0011] The tube to be expanded is cross-linked to allow the tube to be expanded to have a size memory function.

[0012] In some embodiments, the positive pressure expansion of the tubular material to be expanded specifically includes:

[0013] The pipe to be expanded is transported to a hot pressurized tank and heated to a highly elastic state;

[0014] gradually expanding the highly elastic tubular material to be expanded; and / or:

[0015] After the corrugation forming and corrugation shaping of the tube after positive pressure expansion to form an annular corrugated single-wall heat shrink tube, the following steps are further included:

[0016] The annular corrugated single-wall heat shrink tube is subjected to a decontamination treatment.

[0017] In some embodiments, the cross-linked polymer material includes polyolefins, PFA, FEP or PVDF;

[0018] The heat extension value of the cross-linked tube to be expanded ranges from 100% to 240%.

[0019] On the other hand, a continuous forming device for annular corrugated single-wall heat shrinkable tube is provided, which is applied to the continuous forming process for annular corrugated single-wall heat shrinkable tube described in any of the above embodiments, comprising:

[0020] A pipe forming mechanism, used for forming a pipe to be expanded with grooves on the inner wall;

[0021] A feeding mechanism, used for conveying the pipe to be expanded;

[0022] An expansion mechanism, connected to the feeding mechanism, for gradually expanding the tubular material to be expanded;

[0023] A corrugation forming mechanism, connected to the expansion mechanism, for corrugating the gradually expanded pipe;

[0024] The corrugation shaping mechanism is connected to the corrugation forming mechanism and is used for corrugating the corrugated pipe.

[0025] In some embodiments, the expansion mechanism includes a heat pressurized tank body, a guide plate, a sealing plate and an expansion mold, the heat pressurized tank body is connected to the feeding mechanism, and the heat pressurized tank body is provided with a pipe inlet and a pipe outlet;

[0026] The guide plate, the sealing plate and the expansion die are sequentially arranged at the pipe outlet from the inside to the outside, the guide plate is provided with a trumpet-shaped guide hole, the sealing plate is provided with a through hole, and the expansion die is provided with a stepped hole, the stepped hole includes a first stepped hole and a second stepped hole, the guide hole, the through hole, the first stepped hole and the second stepped hole are sequentially coaxially connected and arranged along the axial direction of the hot pressurized tank body, and the apertures of the through hole, the first stepped hole and the second stepped hole are sequentially increased.

[0027] In some embodiments, the corrugation forming mechanism includes two first annular mold blocks that can move in a circumferential direction, the two first annular mold blocks are arranged side by side, and the outer surfaces of the two first annular mold blocks are respectively provided with corrugation forming teeth in the circumferential direction, and a gap is provided between the corrugation forming teeth of the two first annular mold blocks to form a first through hole for passing a pipe, and the first through hole is coaxially arranged with the second stepped hole;

[0028] The corrugation shaping mechanism includes two second annular mold blocks that can move in the circumferential direction. The two second annular mold blocks are arranged side by side. There is a gap between the two second annular mold blocks to form a second through hole for passing the pipe. The second through hole is coaxially arranged with the first through hole.

[0029] In some embodiments, the movement rate of the first annular die block is adjusted to adjust the stretching degree of the tube;

[0030] The second annular mold block moves at the same rate as the first annular mold block.

[0031] In some embodiments, a dirt removal mechanism is further included, and the dirt removal mechanism is connected to the corrugation shaping mechanism;

[0032] The dirt removal mechanism includes a shell, and a dirt removal medium chamber, a vacuum suction chamber and a dirt removal cavity are arranged inside the shell. The dirt removal medium chamber is arranged above the dirt removal cavity, and the vacuum suction chamber is arranged below the dirt removal cavity. One end of the dirt removal cavity is provided with a pipe inlet, and the other end is provided with a pipe outlet. The side wall of the dirt removal cavity is provided with a medium hole connected to the dirt removal medium chamber, and the side wall of the dirt removal cavity is provided with a through slot connected to the vacuum suction chamber.

[0033] On the other hand, an annular corrugated single-wall heat shrinkable tube is also provided, which is prepared by the annular corrugated single-wall heat shrinkable tube continuous molding process described in any of the above embodiments.

[0034] The technical effect of the present invention is that: the present invention forms annular corrugations on the side walls of the heat shrink tube, so that the annular corrugated single-wall heat shrink tube has a small bending radius and excellent overall flexibility. The inner wall of the heat shrink tube is provided with grooves, which can improve the exhaust performance of the heat shrink tube, so that the annular corrugated single-wall heat shrink tube can be applied to special-shaped bars to solve the problems of difficulty in threading, wrinkles, bulging and bridging when conventional heat shrink tubes are applied to special-shaped bars, and the electrical properties of copper and aluminum special-shaped bars are improved. In addition, the present invention is a continuous molding process with high molding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0036] Figure 1It is a schematic diagram of a process for continuous molding of an annular corrugated single-wall heat shrinkable tube provided in a specific embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of a continuous forming device for annular corrugated single-wall heat shrink tube provided in a specific embodiment of the present application;

[0038] Figure 3 It is a cross-sectional view of a continuous forming device for an annular corrugated single-wall heat shrink tube provided in a specific embodiment of the present application;

[0039] Figure 4 is a cross-sectional view of an expansion mechanism provided in a specific embodiment of the present application;

[0040] Figure 5 is a longitudinal cross-sectional view of a dirt removal mechanism provided in a specific embodiment of the present application;

[0041] Figure 6 is a transverse cross-sectional view of a dirt removal mechanism provided in a specific embodiment of the present application;

[0042] Figure 7 It is a structural schematic diagram of an annular corrugated single-wall heat shrink tube provided in a specific embodiment of the present application;

[0043] Figure 8 It is a structural schematic diagram of the annular corrugated single-wall heat shrinkable tube provided in a specific embodiment of the present application before heat shrinkage on the special-shaped row;

[0044] Fig. 9 It is a schematic structural diagram of the annular corrugated single-wall heat shrinkable tube provided in a specific embodiment of the present application after heat shrinkage on a special-shaped row.

[0045] Description of Figure Numbers:

[0046] 10. Feeding mechanism; 20. Expansion mechanism; 21. Hot pressurized tank; 22. Guide plate; 221. Guide hole; 23. Sealing plate; 231. Through hole; 24. Expansion mold; 241. First step hole; 242. Second step hole; 25. Fixed pressing plate; 30. Corrugated forming mechanism; 31. First annular mold block; 311. First heating area; 312. Second heating area; 313. Third heating area; 40. Corrugated shaping mechanism; 41. Second annular mold block; 50. Decontamination mechanism; 51. Shell; 52. Decontamination medium chamber; 53. Vacuum suction chamber; 54. Decontamination chamber; 55. Medium hole; 56. Through notch; 57. Medium inlet; 58. Drainage outlet;

[0047] 100. Annular corrugated single-wall heat shrink tubing; 110. Slotted. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0050] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0051] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0053] The present invention provides an embodiment of a continuous forming process for an annular corrugated single-wall heat shrinkable tube, such as Figure 1 As shown, including:

[0054] S100: forming a cross-linked tube to be expanded by cross-linking polymer material, wherein the inner wall of the tube to be expanded is provided with a plurality of grooves at intervals along the circumferential direction, and the grooves penetrate the axial direction of the tube to be expanded;

[0055] S200 performs positive pressure expansion on the tubular material to be expanded;

[0056] S300 performs corrugation forming and corrugation shaping on the tube after positive pressure expansion to form an annular corrugated single-wall heat shrink tube.

[0057] Specifically, the cross-linkable polymer material includes but is not limited to polyolefins, PFA, FEP or PVDF and other materials. The cross-linkable polymer material is extruded by an extruder to form a pipe to be expanded with a groove on the inner wall. The pipe to be expanded is a pipe with a ring-shaped cross section, and the outer diameter of the pipe to be expanded along the axial direction is consistent. The mold used by the extruder is a slotted mold, so that the inner wall of the pipe to be expanded is formed with multiple grooves at intervals along the circumferential direction. The grooves extend to both ends of the pipe to be expanded along the length direction of the pipe to be expanded. When the heat shrink tube shrinks, the exhaust can be carried out through the grooves set on the inner wall, thereby improving the exhaust performance of the heat shrink tube and avoiding the occurrence of bulging and bridging.

[0058] If the pipe to be expanded formed by the extruder can be cross-linked during extrusion, the extruded pipe to be expanded can be directly expanded under positive pressure. If the cross-linking cannot be achieved during extrusion, the extruded pipe to be expanded is cross-linked to make the pipe to be expanded have a size memory function. The degree of cross-linking of the pipe to be expanded is determined by the thermal extension value, and the thermal extension value range is 100% to 240%. The cross-linking treatment can be selected by electron beam irradiation cross-linking, ultraviolet irradiation cross-linking or dry cross-linking according to the characteristics of the raw materials used for extrusion.

[0059] The pipe to be expanded with a size memory function is expanded under positive pressure, and then the pipe after positive pressure expansion is corrugated and corrugated to form an annular corrugated single-wall heat shrink tube. The corrugated tube has the performance of small bending radius and excellent overall flexibility. Therefore, the outer wall of the heat shrink tube is formed into an annular corrugation, so that the annular corrugated single-wall heat shrink tube has the performance of small bending radius and excellent overall flexibility, so that the annular corrugated single-wall heat shrink tube can be applied to special-shaped bars to solve the problems of difficulty in pipe penetration, wrinkles, bulging and bridging when conventional heat shrink tubes are applied to special-shaped bars, thereby improving the electrical properties of copper and aluminum special-shaped bars.

[0060] In some embodiments, S200 performs positive pressure expansion on the tubular material to be expanded, specifically comprising:

[0061] S210: conveying the pipe to be expanded to a hot pressurized tank and heating it to a highly elastic state;

[0062] S220 gradually expands the highly elastic tube to be expanded.

[0063] Specifically, the pipe to be expanded is first conveyed into the hot pressurized tank body by conveying rollers, the pipe to be expanded is heated and pressurized to a high elastic state in the hot pressurized tank body, and then enters the expansion mold for gradual expansion, the expansion mold is provided with a first step hole and a second step hole, the aperture of the first step hole is smaller than the aperture of the second step hole, the pipe to be expanded in the high elastic state is first expanded in the first step hole, and then enters the second step hole for further expansion. In this embodiment, the pipe to be expanded is gradually expanded by two step holes with different apertures, which can avoid the pipe to be expanded suddenly expanding to a larger size, the pipe wall is too thin, the pipe diameter is too large, and the friction between the pipe wall and the mold causes the pipe to be expanded to be elongated, thereby causing the pipe to be expanded to be stretched unevenly.

[0064] The expanded tube is corrugated by a corrugation forming mechanism and shaped by a corrugation shaping mechanism to form an annular corrugated single-wall heat shrink tube.

[0065] Furthermore, the corrugation forming and corrugation shaping of the tube after positive pressure expansion to form an annular corrugated single-wall heat shrink tube also includes:

[0066] S400 performs a decontamination treatment on the annular corrugated single-wall heat shrink tube.

[0067] The expanded annular corrugated single-wall heat shrink tube is passed through a decontamination mechanism to remove stains and impurities on its surface, thereby obtaining a clean annular corrugated single-wall heat shrink tube. The decontamination mechanism can use water or gas as a decontamination medium.

[0068] The present invention also provides an example of a continuous molding process for an annular corrugated single-wall heat shrinkable tube, comprising:

[0069] (1) Extrusion: 60 parts of EVA, 40 parts of PE, 4 parts of masterbatch, 30 parts of flame retardant, and 4 parts of additives are selected, mixed and granulated, and a slotted extrusion mandrel with a slot depth of 0.1 and a slot spacing of 0.6 is selected and installed on the extruder head. The blended pellets are extruded through the extruder at a molding temperature of 130-170°C to form a pipe to be expanded with a slotted inner wall;

[0070] (2) Cross-linking treatment: The extruded tube to be expanded is placed under an electron acceleration window beam for electron beam irradiation cross-linking, with an irradiation dose of 200KGY, a thermal elongation of 150%±20%, and a beam current intensity of 22mA, so that the material has a dimensional memory function;

[0071] (3) Positive pressure expansion: The cross-linked pipe to be expanded enters the hot pressurized tank through the conveying roller, and the conveying speed is 2m / min. The inside of the pipe is connected to air, and the air pressure inside the pipe can be adjusted. The internal pressure of the hot pressurized tank, that is, the pressure outside the tube, is greater than the pressure inside the tube. The blended material softens at 120-180°C, and the pipe to be expanded is heated in the hot pressurized tank until it softens and enters a highly elastic state. Under the action of the internal pressure of the tank, the softened hot pressurized tank maintains its original shape or expands to a limited low degree, and then passes through the guide plate and the sealing plate. The aperture of the sealing plate is 1-3mm larger than the outer diameter of the pipe to be expanded to ensure the stability of the pressure setting in the tank and reduce leakage pressure; after passing through the sealing plate, it enters the expansion mold. There are two conical step holes inside the expansion mold, and both have a taper of 3°-10°. Pre-expansion is performed inside the expansion mold. Since the air pressure of the tube will partially leak from the sealing plate, a gas isolation layer is formed between the inner wall of the expansion mold and the outer wall of the expansion tube to reduce the occurrence of stretching.

[0072] The pre-expanded tube enters the corrugated forming mechanism with heating function from the expansion die to be fully formed. In the module of the corrugated forming mechanism, the pre-expanded tube is first expanded and filled to the trough of the module, and further expanded and filled to the crest of the module under the action of the inflation pressure inside the tube to complete the expansion forming, and then moves with the forward movement of the corrugated die block. On the one hand, the corrugated forming mechanism forms the outside of the corrugated tube, and on the other hand, it performs the traction function and cooperates with the conveying roller to adjust the stretching degree of the corrugated tube; the tube is fully formed by the corrugated forming mechanism and further enters the corrugated shaping mechanism. The temperature of the corrugated shaping mechanism is 15℃-25℃, and the corrugated tube is fully cooled and shaped; the cooling of the corrugated shaping mechanism uses spray water cooling.

[0073] Adjust the relative position and distance between the corrugation forming mechanism and the corrugation shaping mechanism to ensure that the formed corrugated pipe can be accurately engaged when it is shaped by the corrugation shaping mechanism to ensure the shaping quality.

[0074] (4) Decontamination: After expansion, the annular corrugated multiple single-wall heat shrinkable tube passes through a decontamination mechanism and is sprayed with water to remove stains and impurities on its surface, thereby obtaining a slotted annular corrugated multiple single-wall heat shrinkable tube with excellent shrinkage performance, small bending radius, excellent overall flexibility, and excellent exhaust, which is suitable for shrinking special-shaped components.

[0075] The present invention also provides an embodiment of an annular corrugated single-wall heat shrink tube continuous forming device, such as Figure 2 and Figure 3As shown, it includes a tube forming mechanism, a feeding mechanism 10, an expansion mechanism 20, a corrugation forming mechanism 30 and a corrugation shaping mechanism 40. The tube forming mechanism is used to form a tube to be expanded whose inner wall is provided with grooves; the feeding mechanism 10 is used to transport the tube to be expanded; the expansion mechanism 20 is connected to the feeding mechanism 10 and is used to gradually expand the tube to be expanded; the corrugation forming mechanism 30 is connected to the expansion mechanism 20 and is used to corrugate the tube after gradual expansion; the corrugation shaping mechanism 40 is connected to the corrugation forming mechanism 30 and is used to corrugate the tube after corrugation shaping.

[0076] Specifically, the pipe forming mechanism is used to form pipes, and the pipe extruder uses a slotted mold to form a pipe to be expanded with slots on the inner wall, and the pipe to be expanded is a hollow cylindrical pipe. The feeding mechanism 10 is a conveying roller, and the formed pipe to be expanded is input to the expansion mechanism 20 through the conveying roller, and the pipe to be expanded is gradually expanded by the expansion mechanism 20. The gradual expansion means that a small-size expansion is performed first, and then a large-size expansion is performed to avoid a sudden expansion to a larger diameter, when the pipe wall is too thin, the pipe diameter is too large, and the friction between the pipe wall and the mold causes the pipe to be expanded to be elongated, which in turn causes the pipe to be expanded to be stretched unevenly.

[0077] After the expansion tube is expanded, it is sent to the corrugation forming mechanism 30 for corrugation forming. Corrugation forming refers to forming a corrugated shape on the wall of the tube to form a corrugated heat shrink tube. The corrugated heat shrink tube is a single-wall heat shrink tube. The formed corrugated heat shrink tube is sent to the corrugation shaping mechanism 40 for corrugation shaping, and finally forms an annular corrugated single-wall heat shrink tube 100. The structure of the annular corrugated single-wall heat shrink tube 100 is as shown in FIG. Figure 7 As shown, the inner wall of the annular corrugated single-wall heat shrinkable tube 100 is provided with a groove 110; the annular corrugated single-wall heat shrinkable tube 100 of this embodiment is an annular corrugated multiple single-wall heat shrinkable tube, where multiple refers to the expansion multiple, that is, the heat shrinkage ratio.

[0078] The present embodiment forms a corrugated single-wall heat shrink tube through an expansion mechanism 20, a corrugation forming mechanism 30 and a corrugation shaping mechanism 40. The heat shrink tube has the characteristics of a small bending radius and excellent overall flexibility. In addition, the inner wall of the heat shrink tube is provided with a groove 110, which can improve the exhaust performance of the heat shrink tube, so that the annular corrugated multiple single-wall heat shrink tube 100 can be applied to special-shaped bars to solve the problems of difficulty in pipe threading, wrinkles, bulging and bridging when conventional heat shrink tubes are applied to special-shaped bars, and improve the electrical properties of copper and aluminum special-shaped bars. The annular corrugated single-wall heat shrink tube continuous forming equipment of the present embodiment can continuously produce annular corrugated multiple single-wall heat shrink tubes with a heat shrink ratio of more than twice, excellent shrinkage performance, a small bending radius, excellent overall flexibility, excellent exhaust, and applied to the shrinkage of special-shaped components, and has high production efficiency.

[0079] In some embodiments, Figure 4As shown, the expansion mechanism 20 includes a hot pressurized tank body 21, a guide plate 22, a sealing plate 23 and an expansion mold 24. The hot pressurized tank body 21 is connected to the feeding mechanism 10, and the hot pressurized tank body 21 is provided with a pipe inlet and a pipe outlet; the guide plate 22, the sealing plate 23 and the expansion mold 24 are arranged at the pipe outlet in sequence from the inside to the outside, the guide plate 22 is provided with a trumpet-shaped guide hole 221, the sealing plate 23 is provided with a through hole 231, and the expansion mold 24 is provided with a stepped hole, the stepped hole includes a first stepped hole 241 and a second stepped hole 242, the guide hole 221, the through hole 231, the first stepped hole 241 and the second stepped hole 242 are coaxially connected and arranged in sequence along the axial direction of the hot pressurized tank body 21, and the apertures of the through hole 231, the first stepped hole 241 and the second stepped hole 242 increase in sequence.

[0080] The heat pressurized tank body 21 is a heat pressurized tank body, which can heat and pressurize the pipe to be expanded, so that the pipe to be expanded is heated to a high elastic state. The heating medium used by the heat pressurized tank body 21 can be gas or liquid, including but not limited to air medium or glycerin. One end of the heat pressurized tank body 21 is provided with a pipe inlet, and the other end is provided with a pipe outlet. The guide plate 22, the sealing plate 23 and the expansion mold 24 are sequentially arranged at the pipe outlet. The guide plate 22 is provided with a guide hole 221, and the guide hole 221 is trumpet-shaped, which can guide the pipe to be expanded in the heat pressurized tank body 21 into the through hole 231 on the sealing plate 23. When the pipe to be expanded is in the guide hole 221 and the through hole 231, the pressure outside the pipe is greater than the pressure inside the pipe, and the pipe to be expanded is not expanded. The aperture of the through hole 231 is slightly larger than the outer diameter of the pipe to be expanded, so that the pipe to be expanded can pass smoothly, and the stability of the pressure setting in the tank is ensured to reduce leakage pressure.

[0081] After the pipe to be expanded enters the expansion die 24 from the through hole 231, the internal and external pressures are not equal. Under the action of the internal inflation pressure of the pipe to be expanded, the pipe to be expanded begins to be pre-expanded; the expansion die 24 is provided with a first step hole 241 and a second step hole 242 along the axial direction of the hot pressurized tank 21. The pipe to be expanded is pre-expanded in the first step hole 241 and expanded again in the second step hole 242 to achieve the gradual expansion of the pipe to be expanded. It should be noted that in this embodiment, the expansion die 24 is provided with a first step hole 241 and a second step hole 242 with different apertures, which can achieve the secondary gradual expansion of the pipe to be expanded. In other embodiments, the expansion die 24 can also be provided with more step holes with different apertures as needed to meet different gradual expansion requirements.

[0082] Furthermore, if Figure 4 As shown, a fixed pressing plate 25 is also provided outside the sealing plate 23, and the fixed pressing plate 25 fixes the sealing plate 23 to the pipe outlet of the hot press tank 21. One end of the expansion mold 24 is connected to the sealing plate 23, and the other end passes through the fixed pressing plate 25 and is connected to the corrugated forming mechanism 30.

[0083] The corrugation forming mechanism 30 includes two first annular mold blocks 31 that can move in the circumferential direction. The two first annular mold blocks 31 are arranged side by side. The outer surfaces of the two first annular mold blocks 31 are respectively provided with corrugation forming teeth in the circumferential direction. There is a gap between the corrugation forming teeth of the two first annular mold blocks 31 to form a first through hole for passing the pipe. The first through hole is coaxially arranged with the second stepped hole 242.

[0084] After the expansion of the pipe to be expanded is completed in the second stepped hole 242 of the expansion die 24, it enters the first through hole between the two first annular mold blocks 31. The outer wall of the first annular mold block 31 is provided with corrugated forming teeth, and the corrugated forming teeth have wave crests and wave troughs. When the two first annular mold blocks 31 move in the circumferential direction, the pipe is first expanded and filled to the wave crests of the corrugated forming teeth to form wave troughs on the side wall of the pipe, and then further expanded and filled to the wave troughs of the corrugated forming teeth under the action of the inflation pressure inside the pipe to form wave crests on the side wall of the pipe, completing the expansion and molding of the pipe. Then the pipe moves with the forward movement of the first annular mold block 31. By adjusting the movement rate of the first annular mold block 31, the first annular mold block 31 can also play a role in pulling and adjusting the stretching degree of the corrugated pipe. For example, when the movement rate of the first annular mold block 31 is greater than the movement rate of the pipe to be expanded in the expansion die 24, the first annular mold block 31 will stretch the pipe to be expanded to play a role in adjusting the stretching degree of the corrugated pipe.

[0085] like Figure 2 As shown, the first annular mold block 31 is provided with a plurality of heating areas in sequence along the forward direction of the tube, such as a first heating area 311, a second heating area 312 and a third heating area 313. The heating temperatures of the first heating area 311, the second heating area 312 and the third heating area 313 are arranged in sequence from high to low along the forward direction of the tube, which can facilitate the cooling and shaping of the tube after corrugation forming.

[0086] The corrugation shaping mechanism 40 includes two second annular mold blocks 41 that can move in the circumferential direction. The two second annular mold blocks 41 are arranged side by side. There is a gap between the two second annular mold blocks 41 to form a second through hole for passing the pipe. The second through hole is coaxially arranged with the first through hole. The movement rate of the second annular mold block 41 is the same as the movement rate of the first annular mold block 31.

[0087] After the corrugation forming is completed, the tube enters between the two second annular mold blocks 41 for cooling and shaping. The corrugation shaping mechanism 40 can be cooled by cooling water or air. The outer wall of the second annular mold block 41 is also provided with corrugation shaping teeth. The relative position and distance between the corrugation shaping mechanism 30 and the corrugation shaping mechanism 40 and the movement rate of the second annular mold block 41 are adjusted to ensure that the formed corrugated heat shrink tube can be accurately meshed with the corrugation shaping teeth on the second annular mold block 41 when it is shaped by the corrugation shaping mechanism 40, thereby ensuring the shaping quality.

[0088] Furthermore, if Figure 2 and Figure 3 As shown, it also includes a dirt removal mechanism 50, which is connected to the corrugation shaping mechanism 40; Figure 5 and Figure 6 As shown, the dirt removal mechanism 50 includes a shell 51, and a dirt removal medium chamber 52, a vacuum suction chamber 53 and a dirt removal cavity 54 are arranged inside the shell 51. The dirt removal medium chamber 52 is arranged above the dirt removal cavity 54, and the vacuum suction chamber 53 is arranged below the dirt removal cavity 54. A pipe inlet is arranged at one end of the dirt removal cavity 54, and a pipe outlet is arranged at the other end. A medium hole 55 connected to the dirt removal medium chamber 52 is arranged on the side wall of the dirt removal cavity 54, and a through slot 56 connected to the vacuum suction chamber 53 is arranged on the side wall of the dirt removal cavity 54.

[0089] A decontamination chamber 54 is provided in the middle of the housing 51, and the outer annular area of ​​the decontamination chamber 54 is divided into a decontamination medium chamber 52 and a vacuum suction chamber 53. A plurality of medium holes 55 communicating with the decontamination medium chamber 52 are provided on the side wall of the decontamination chamber 54 corresponding to the decontamination medium chamber 52, and the decontamination medium in the decontamination medium chamber 52 enters the decontamination chamber 54 through the medium holes 55 to decontaminate the annular corrugated multiple single-wall heat shrink tube in the decontamination chamber 54. A through notch 56 is provided on the side wall of the decontamination chamber 54 corresponding to the vacuum suction chamber 53, and the decontamination medium (such as water) in the decontamination chamber 54 enters the vacuum suction chamber 53 through the through notch 56 to be discharged. In the longitudinal cross-sectional direction, the decontamination medium chamber 52 occupies an angle of 320°-340° of the entire housing 51, and the vacuum suction chamber 53 occupies an angle of 20°-40° of the entire housing 51. A medium inlet 57 is also provided at the top of the decontamination medium chamber 52 ; a sewage outlet 58 is also provided at the bottom of the vacuum suction chamber 53 .

[0090] The present invention also provides an embodiment of an annular corrugated single-wall heat shrinkable tube. The structure of the annular corrugated single-wall heat shrinkable tube 100 is as follows: Figure 7 As shown, it is prepared by the continuous molding process of the annular corrugated single-wall heat shrinkable tube of the above embodiment. The annular corrugated single-wall heat shrinkable tube has excellent shrinkage performance, small bending radius, excellent overall flexibility, and excellent exhaust, and can be used for shrinking special-shaped components. The structure of the annular corrugated single-wall heat shrinkable tube 100 before heat shrinking is as shown in FIG. Figure 8 As shown, the structure after heat shrinkage is as follows Fig. 9 shown.

[0091] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A continuous forming process for annular corrugated single-wall heat shrinkable tube, characterized in that: include: A cross-linked tube to be expanded is formed by a cross-linkable polymer material, wherein the inner wall of the tube to be expanded is provided with a plurality of grooves at intervals along the circumferential direction, and the grooves penetrate the axial direction of the tube to be expanded; Performing positive pressure expansion on the tubular material to be expanded; The tube after positive pressure expansion is subjected to corrugation forming and corrugation shaping to form an annular corrugated single-wall heat shrink tube.

2. The continuous forming process of annular corrugated single-wall heat shrink tube according to claim 1, characterized in that: The tubular material to be expanded in a cross-linked state formed by a cross-linkable polymer material specifically comprises: Select a cross-linkable polymer material and extrude it into a pipe to be expanded with grooves on the inner wall through an extruder; The tube to be expanded is cross-linked to allow the tube to be expanded to have a size memory function.

3. The continuous forming process of annular corrugated single-wall heat shrink tube according to claim 1, characterized in that: The positive pressure expansion of the tubular material to be expanded specifically includes: The pipe to be expanded is transported to a hot pressurized tank and heated to a highly elastic state; gradually expanding the highly elastic tubular material to be expanded; and / or: After the corrugation forming and corrugation shaping of the tube after positive pressure expansion to form an annular corrugated single-wall heat shrink tube, the following steps are further included: The annular corrugated single-wall heat shrink tube is subjected to a decontamination treatment.

4. A continuous forming process for an annular corrugated single-wall heat shrink tube according to any one of claims 1 to 3, characterized in that: The cross-linked polymer material includes polyolefins, PFA, FEP or PVDF; The heat extension value of the cross-linked tube to be expanded ranges from 100% to 240%.

5. A continuous forming device for annular corrugated single-wall heat shrink tube, characterized in that: The continuous forming process of the annular corrugated single-wall heat shrinkable tube according to any one of claims 1 to 4 comprises: A pipe forming mechanism, used for forming a pipe to be expanded with grooves on the inner wall; A feeding mechanism, used for conveying the tubular material to be expanded; An expansion mechanism, connected to the feeding mechanism, for gradually expanding the tubular material to be expanded; A corrugation forming mechanism, connected to the expansion mechanism, for corrugating the gradually expanded pipe; The corrugation shaping mechanism is connected to the corrugation forming mechanism and is used for corrugating the corrugated pipe.

6. The annular corrugated single-wall heat shrink tube continuous forming equipment according to claim 5, characterized in that: The expansion mechanism comprises a heat pressurized tank body, a guide plate, a sealing plate and an expansion die, the heat pressurized tank body is connected to the feeding mechanism, and the heat pressurized tank body is provided with a pipe inlet and a pipe outlet; The guide plate, the sealing plate and the expansion die are sequentially arranged at the pipe outlet from the inside to the outside, the guide plate is provided with a trumpet-shaped guide hole, the sealing plate is provided with a through hole, and the expansion die is provided with a stepped hole, the stepped hole includes a first stepped hole and a second stepped hole, the guide hole, the through hole, the first stepped hole and the second stepped hole are sequentially coaxially connected and arranged along the axial direction of the hot pressurized tank body, and the apertures of the through hole, the first stepped hole and the second stepped hole are sequentially increased.

7. The annular corrugated single-wall heat shrink tube continuous forming equipment according to claim 6, characterized in that: The corrugation forming mechanism comprises two first annular mold blocks that can move in the circumferential direction, the two first annular mold blocks are arranged side by side, the outer surfaces of the two first annular mold blocks are respectively provided with corrugation forming teeth in the circumferential direction, a gap is provided between the corrugation forming teeth of the two first annular mold blocks to form a first through hole for passing the pipe, and the first through hole is coaxially arranged with the second stepped hole; The corrugation shaping mechanism includes two second annular mold blocks that can move in the circumferential direction. The two second annular mold blocks are arranged side by side. There is a gap between the two second annular mold blocks to form a second through hole for passing the pipe. The second through hole is coaxially arranged with the first through hole.

8. The annular corrugated single-wall heat shrink tube continuous forming equipment according to claim 7, characterized in that: Adjusting the movement rate of the first annular die block to adjust the stretching degree of the pipe; The second annular mold block moves at the same rate as the first annular mold block.

9. The annular corrugated single-wall heat shrink tube continuous molding equipment according to claim 5, characterized in that: It also includes a dirt removal mechanism, which is connected to the corrugation shaping mechanism; The dirt removal mechanism includes a shell, and a dirt removal medium chamber, a vacuum suction chamber and a dirt removal cavity are arranged inside the shell. The dirt removal medium chamber is arranged above the dirt removal cavity, and the vacuum suction chamber is arranged below the dirt removal cavity. One end of the dirt removal cavity is provided with a pipe inlet, and the other end is provided with a pipe outlet. The side wall of the dirt removal cavity is provided with a medium hole connected to the dirt removal medium chamber, and the side wall of the dirt removal cavity is provided with a through slot connected to the vacuum suction chamber.

10. An annular corrugated single-wall heat shrink tube, characterized in that: The annular corrugated single-wall heat shrinkable tube is prepared by the continuous molding process of any one of claims 1 to 4.

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