A heated tube expander and method of use

Abstract

This invention provides a heated tube expander and its usage method, comprising a heating device, a tube expander cooling device, and an air-blowing heating tube. The heating device includes a heating box with a heating shaft and a support plate, on which a hanging basket is rotatably mounted. The tube expander cooling device includes an inclined limiting tube and water spray pipes distributed above it, with a water collection tank below. The air-blowing heating tube includes a main tube, an outer expansion sleeve, and an air outlet at the end. The expansion sleeve can be a double-layer structure with an inner and outer sleeve, cooperating with a piston and spring to achieve staged expansion. The device also includes a tube removal device, comprising a removal tube and a support frame. In use, the air-blowing heating tube with the protective sleeve is heated and placed into the limiting tube, inflated, and cooled and shaped by water spraying. The expansion sleeve and the finished tube are then separated through the removal tube. This invention can improve the dimensional accuracy, wall thickness uniformity, and yield of the expanded tube.

Description

Technical Field

[0001] This invention relates to the field of power fittings technology, and in particular to a heating tube expander and its usage method. Background Technology

[0002] Cables are used to transmit electricity. Since cables have a limited length, it is inevitable to connect two cables. The metal joints of the two cables are directly connected by metal wires. Therefore, it is necessary to seal the metal joints to prevent rainwater from entering. In existing technology, the metal joints of the two cables are usually wrapped with an outer sheath. Furthermore, to further improve the sealing of the cable joints, an EVA material sheath is often installed on the outer sheath.

[0003] The sheath is fitted over the metal joints of the two cables and is bonded to the plastic sheath and metal joints of the cables by heating. After curing, it forms a seamless and reliable waterproof seal that effectively isolates external moisture and humidity.

[0004] However, during the production of the sheath, a thinner sheath needs to be expanded into a larger diameter sheath to facilitate its installation on the outside of the cable. Existing sheath expansion devices struggle to control the expansion diameter, resulting in inconsistent expansion sizes and varying sheath wall thicknesses. Consequently, when wrapped around the metal joint of the cable, the thinner sections of the sheath are more prone to breakage, leading to poor insulation performance. Summary of the Invention

[0005] This invention provides a heating tube expansion device and its usage method, aiming to solve the problem in the prior art that the diameter of the expanded sheath tube is difficult to control, resulting in different sizes of the expanded sheath tube, making the sheath tube in the thinner wall position easy to break and the insulation protection effect poor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a heating-type tube expander, comprising: Heating device, the heating device including a heating chamber; A pipe expansion cooling device, comprising a limiting pipe and a plurality of water spray pipes arranged along the length direction of the limiting pipe; An air-blowing heating tube includes a main tube, an expansion sleeve disposed around the main tube, and an air-blowing port disposed at the end of the main tube and communicating with the expansion sleeve. The process involves placing the sheath to be expanded around the expansion sleeve and then placing it inside the heating box for heating. After heating, the air-blowing heating pipe with the sheath to be expanded is inserted into the limiting tube. Then, air is blown from the air outlet onto the expansion sleeve, causing the expansion sleeve to inflate and push the sheath to be expanded to expand. Afterward, water is sprayed onto the limiting tube to cool it down. The air-blowing heating pipe is then pulled out of the limiting tube, and the expanded sheath is removed from the outer wall of the air-blowing heating pipe.

[0007] In one embodiment, the heating device includes a heating shaft disposed in the heating box and support plates fixedly disposed at both ends of the heating shaft along its length. Several baskets are rotatably disposed on the opposite surfaces of the two support plates, and the baskets maintain an upward opening under their own weight.

[0008] In one embodiment, the baskets on the two support plates are respectively arranged; The two ends of the air-blowing heating tube are placed on the baskets of the two support plates respectively.

[0009] In one embodiment, the suspended platform includes a suspended plate, on which a horizontal plate and vertical plates are vertically disposed at both ends; The hanging plate is provided with a rotating shaft that is rotatably connected to the support plate.

[0010] In one embodiment, the expansion tube cooling device includes a water collection tank, the top of which has an opening, and the limiting tube is inclinedly disposed at the opening, with the inlet end of the limiting tube being the top end.

[0011] In one embodiment, a water pump is installed in the water collection tank, the outlet of the water pump is connected to the main return water pipe, and the main return water pipe is connected to several sprinkler pipes.

[0012] In one embodiment, a support wheel is provided below the inlet end of the limiting tube.

[0013] In one embodiment, the device further includes a tube removal device, which includes an operating table and a tube removal device disposed on the operating table. The diameter of the sheathing tube is D1, and the inner diameter of the expanded sheathing tube is D2, wherein D1 is smaller than D2.

[0014] In one embodiment, a support tube is provided on the operating table; One end of the unsleeving tube is inserted into the support tube, and a support frame is provided on the bottom periphery of the other end of the unsleeving tube. A unsleeving wheel is rotatably mounted on the support frame; the unsleeving wheel is located below the unsleeving tube.

[0015] In a second aspect, a method of using a heating-type tube expander, performed by the aforementioned heating-type tube expander, further includes the following steps: The sheath tube to be expanded is placed around the expansion sleeve, and the air-blowing heating tube with the sheath tube to be expanded is placed into the heating box for heating. After heating is complete, the air-blowing heating tube, which is fitted with the sheath to be expanded, is inserted into the limiting tube. Then, air is blown into the expansion sleeve through the air inlet, causing the expansion sleeve to inflate and push the expansion sheath tube to expand. After the expansion sheath tube expands, it abuts against the inner wall of the limiting tube. Afterwards, the sprinkler pipe sprays water onto the limiting pipe to cool it down; Pull the air-blowing heating tube out of the limiting tube, release the gas in the expansion sleeve through the air-blowing port, align the air-blowing heating tube with the release tube, insert the release tube into the air-blowing heating tube, and when the release tube moves in the air-blowing heating tube, the release tube acts on the outer wall of the expansion sleeve to separate the expansion sleeve from the expanded protective sleeve tube.

[0016] The beneficial effects of this invention compared to the prior art are as follows: In this application, the air-blowing heating tube is manually operated. The sheath to be expanded is placed around the air-blowing heating tube. At this time, the expansion sleeve is not inflated and is in a retracted state, making it easy to place the sheath to be expanded over the expansion sleeve. Then, the expansion sleeve is placed in the heating box for heating. After heating is complete, the air-blowing heating tube is removed from the heating device, and then the heated air-blowing heating tube is inserted into the limiting tube. Air is then blown through the air-blowing device from the air-blowing port, and the gas enters the expansion sleeve from the air-blowing port, causing the expansion sleeve to expand. During the expansion process, the expansion sleeve pushes the heated sheath to be expanded to expand, and the outer wall of the sheath to be expanded expands and abuts against the limiting tube. The limiting tube has both the function of shaping the expansion sheath and the function of abutting and limiting the expansion sheath to be expanded. It can control the size of the expansion sheath to be expanded, so that the diameter of the expanded sheath to be expanded is the same as the inner wall diameter of the limiting tube, ensuring that the wall thickness of the expanded sheath is uniform throughout, thus improving the overall quality of the product.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of a heating tube expander provided in an embodiment of the present invention; Figure 2This is a three-dimensional structural view of a heating tube expander device provided in an embodiment of the present invention from another angle. Figure 3 This is a three-dimensional structural diagram of a heating device for a heating tube expansion apparatus provided in an embodiment of the present invention, after removing the heating box; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 This is a front view of the air-blowing heating tube of a heating tube expander provided in an embodiment of the present invention; Figure 6 A partial cross-sectional view of the air-blowing heating tube of a heating tube expander device provided in an embodiment of the present invention; Figure 7 This is a partial cross-sectional view of another embodiment of the air-blowing heating tube of a heating tube expander provided in this invention.

[0019] Figure label: 1. Heating device; 11. Heating shaft; 12. Support plate; 13. Suspended basket; 131. Suspended plate; 132. Horizontal plate; 133. Vertical plate; 14. Heating box; 141. Loading / unloading port; 15. Motor. 2. Expansion pipe cooling device; 21. Limiting pipe; 22. Sprinkler pipe; 23. Water collection tank; 231. Tank opening; 24. Crossbar; 25. Support wheel; 3. Air heating tube; 31. Main tube; 32. Expansion sleeve; 321. Inner expansion sleeve; 322. Outer expansion sleeve; 33. Air inlet; 331. First air inlet; 332. Second air inlet; 333. Abutting protrusion ring; 334. Vent hole; 34. Piston; 35. Spring; 36. Gas quick connector. 4. Tube removal device; 41. Operating table; 42. Tube removal tube; 43. Support tube; 44. Support frame; 45. Tube removal wheel; 5. Sheath tube. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] Please see Figure 1-7 This invention provides a heating tube expander device, comprising: Heating device 1, the heating device 1 including heating box 14; The expansion pipe cooling device 2 includes a limiting pipe 21 and a plurality of water spray pipes 22 arranged along the length direction of the limiting pipe 21. The air-blowing heating tube 3 includes a main tube 31, an expansion sleeve 32 disposed around the main tube 31, and an air-blowing port 33 disposed at the end of the main tube 31 and communicating with the expansion sleeve 32. The expansion sleeve 5 is placed around the expansion sleeve 32 and then placed in the heating box 14 for heating. After heating, the air-blowing heating pipe 3 with the expansion sleeve 5 is inserted into the limiting pipe 21. Then, air is blown from the air outlet 33 into the expansion sleeve 32, causing the expansion sleeve 32 to inflate and push the expansion sleeve 5 to expand. After the water spray pipe 22 sprays water onto the limiting pipe 21 to cool it down, the air-blowing heating pipe 3 is pulled out from the limiting pipe 21, and the expanded sleeve 5 is removed from the outer wall of the air-blowing heating pipe 3.

[0025] In this embodiment, an electric heating wire is installed inside the heating box 14 to heat the sheath 5 to be expanded placed inside, softening the sheath 5 and preparing it for subsequent expansion. The air-blowing heating tube 3 is manually operated to place the sheath 5 around the air-blowing heating tube 3. At this time, the expansion sleeve 32 is not inflated and is in a retracted state, allowing the sheath 5 to be easily placed over it. The expansion sleeve 32 is then placed inside the heating box 14 for heating. After heating is complete, the air-blowing heating tube 3 is removed from the heating device 1. Then, the heated air-blowing heating tube 3 is inserted into the limiting tube 21. Then, air is blown from the air-blowing port 33 through the air-blowing device. The gas enters the expansion sleeve 32 from the air-blowing port 33, causing the expansion sleeve 32 to expand. During the expansion process, the expansion sleeve 32 will push the heated sheath tube 5 to expand, and cause the outer wall of the sheath tube 5 to expand to expand and abut against the limiting tube 21. The limiting tube 21 has the function of shaping the expansion sheath tube 5, and at the same time, it can also play the role of abutting and limiting the expansion sheath tube 5. It can control the size of the expansion sheath tube 5 after expansion, so that the diameter of the expansion sheath tube 5 after expansion is the same as the inner wall diameter of the limiting tube 21, ensuring that the wall thickness of the expanded sheath tube 5 is uniform throughout, and improving the overall quality of the product.

[0026] In this embodiment, the sheath tube 5 is made of EVA material.

[0027] In this embodiment, as Figure 2 and Figure 3 As shown, the heating device 1 includes a heating shaft 11 disposed in the heating box 14 and support plates 12 fixedly disposed at both ends of the heating shaft 11 along its length. Several baskets 13 are rotatably disposed on the opposite surfaces of the two support plates 12, and the baskets 13 maintain an upward opening under their own weight.

[0028] The baskets 13 on the two support plates 12 are respectively arranged; The two ends of the air-blowing heating tube 3 are placed on the basket 13 of the two support plates 12 respectively.

[0029] In this embodiment, a horizontally oriented pick-and-place port 141 is provided on the side wall of the heating box 14, through which the air-blowing heating tube 3 can be placed into the heating box 14. The heating shaft 11 inside the heating box 14 is also placed horizontally. A motor 15 is provided at the end of the heating shaft 11 to drive its rotation. Two support plates 12 are provided on the heating shaft 11, and a hanging basket 13 is provided on the opposite surface of the two support plates 12. The two hanging baskets 13 of the same height on the two support plates 12 form a structure for placing the air-blowing heating tube 3, so that the two hanging baskets 13 can support both ends of the air-blowing heating tube 3 respectively and fix it between the two support plates 12.

[0030] The support plate 12 can rotate along with the heating shaft 11. During the rotation of the support plate 12, it can drive the air-blowing heating tube 3 to rotate, so that the air-blowing heating tube 3 can be heated evenly in the heating box 14. In addition, the basket 13 can maintain an upward opening under its own gravity, which not only makes it easy to put the air-blowing heating tube 3 on the basket 13, but also prevents the air-blowing heating tube 3 from falling off the basket 13 during the rotation of the support plate 12.

[0031] In this embodiment, as Figure 4 As shown, the suspended platform 13 includes a suspended plate 131, on which a horizontal plate 132 and vertical plates 133 are vertically arranged at both ends of the horizontal plate 132 are provided. The hanging plate 131 is provided with a rotating shaft that is rotatably connected to the support plate 12.

[0032] The two vertical plates 133 work together to form an upward-opening basket structure, and the horizontal plate 132 is used to support the air-blowing heating tube 3.

[0033] In this embodiment, the distance between the opposite faces of the hanging plates 131 of the two suspended baskets 13 at the same horizontal height is L1, the length of the horizontal plate 132 along the horizontal direction is S, and the length of the air-blowing heating tube 3 is L1-2S<L2<L1. This allows the air-blowing heating tube 3 to be conveniently and quickly placed between the two horizontal plates 132.

[0034] In this embodiment, as Figure 2 As shown, the expansion tube cooling device 2 includes a water collection tank 23, the top of which is provided with a tank opening 231, and the limiting tube 21 is inclinedly arranged at the tank opening 231, with the inlet end of the limiting tube 21 being the top end.

[0035] In this embodiment, several horizontal supports 24 are provided on both sides of the opening 231 of the box body. The horizontal supports 24 are inclined so that the air blowing heating pipe 3 can be placed at an angle on the horizontal supports 24. Thus, when the water spray pipe 22 sprays water on the periphery of the limiting pipe 21, the water flow can flow downward along the limiting pipe 21. During the water flow, the limiting pipe 21 can be cooled, increasing the contact time between the water flow and the limiting pipe 21. At the same time, after the water flows downward along the limiting pipe 21, it falls into the water collection tank 23, which can reduce the height difference of the water flow falling into the water collection tank 23.

[0036] In another embodiment, a water pump is provided in the water collection tank 23, the outlet of the water pump is connected to the main return water pipe, and the main return water pipe is connected to a plurality of the sprinkler pipes 22.

[0037] The water pump installed in the water collection tank 23 in this embodiment can recycle the water in the water collection tank 23, thus saving water resources.

[0038] In a further embodiment, a support wheel 25 is provided below the inlet end of the limiting tube 21.

[0039] The support wheel 25 is designed to protect the expansion sleeve 5, which is fitted over the outside of the air-heating tube 3, when the air-blowing heating tube 3 is inserted into the limiting tube 21, thus reducing friction on the outer wall of the expansion sleeve 5 and preventing damage or wear to the outer wall of the expansion sleeve 5.

[0040] In a further embodiment, such as Figure 2 As shown, it also includes a tube removal device 4, which includes an operating table 41 and a tube removal device 42 disposed on the operating table 41; The diameter of the sheathing tube 42 is D1, and the inner diameter of the expanded sheathing tube 5 is D2, wherein D1 is smaller than D2.

[0041] The function of the release tube 42 is to prevent the outer wall of the expansion sleeve 32 from sticking to the inner wall of the expanded protective sleeve 5 after the air heating tube 3 is pulled out from the limiting tube 21, making it difficult to separate the expansion sleeve 32 from the inside of the protective sleeve 5. Therefore, the release tube 42 is provided. When in use, the release tube 42 is inserted into the air heating tube 3. As the release tube 42 moves within the air heating tube 3, it acts on the outer wall of the expansion sleeve 32, separating the expansion sleeve 32 from the expanded protective sleeve 5.

[0042] In a further embodiment, a support tube 43 is provided on the operating table 41; One end of the unsleeving tube 42 is inserted into the support tube 43, and a support frame 44 is provided on the bottom periphery of the other end of the unsleeving tube 42. A unsleeving wheel 45 is rotatably mounted on the support frame 44. The unsleeving wheel 45 is located below the unsleeving tube 42.

[0043] The end of the release tube 42 is inserted into the end of the support tube 43. The support tube 43 can support the release tube 42, so that the end of the release tube 42 away from the support tube 43 can be suspended, which makes it easy to align the air-blowing heating tube 3 from the end of the release tube 42 and to insert the release tube 42 into the air-blowing heating tube 3.

[0044] In one embodiment, the expansion sleeve 32 is made of fabric (e.g., umbrella fabric), which has good airtightness and can be arbitrarily shaped and deformed, so that when the expansion sleeve 32 contracts, the expansion sheath tube 5 can be smoothly inserted into the expansion sleeve 32.

[0045] In another embodiment, such as Figure 7As shown, the expansion sleeve 32 in this embodiment includes an inner expansion sleeve 321 and an outer expansion sleeve 322. The inner expansion sleeve 321 is disposed around the main pipe 31, and the outer expansion sleeve 322 is sleeved around the inner expansion sleeve 321. An air inlet 33 is provided at one end of the main pipe 31, and the air inlet 33 is arranged along the axis of the main pipe 31; a second air hole 332 and a first air hole 331 are arranged sequentially on the inner side wall of the air inlet 33 towards the position close to its opening; the first air hole 331 communicates with the inner expansion sleeve 321, and the second air hole 332 communicates with the outer expansion sleeve 322; An abutting protrusion 333 is provided circumferentially on the inner sidewall of the air inlet 33. The abutting protrusion 333 is located between the first air inlet 331 and the second air inlet 332. A piston 34 and a spring 35 are also provided inside the air inlet 33. The piston 34 is sealed to the inner sidewall of the air inlet 33. One end of the spring 35 abuts against the bottom of the air inlet 33, and the other end of the spring 35 pushes the piston 34 to abut against the abutting protrusion 333. The piston 34 abuts against the abutting protrusion 333 at a position close to the second air inlet 332.

[0046] The inner expansion sleeve 321 cooperates with the outer wall of the main pipe 31 to form a first sealing cavity, and the outer expansion sleeve 322 cooperates with the inner expansion sleeve 321 to form a second sealing cavity.

[0047] In this embodiment, when the heated heating tube 3, fitted with the expansion sleeve 5, is placed inside the limiting tube 21, air is blown into the air outlet 33 by the air blowing device. At this time, with the cooperation of the piston 34 and the spring 35, the second air outlet 332 is blocked, and the gas can only enter the inner expansion sleeve 321 (in the first sealed cavity) through the first air outlet 331, causing the inner expansion sleeve 321 to begin to expand. After the inner expansion sleeve 321 has completed its expansion, the pressure at the air outlet 33 increases, which not only enables... As the pressure in the inner expansion sleeve 321 increases, it first pushes the sheath tube 5 outward to expand, and simultaneously pushes the piston 34 towards the air inlet 33. With increasing pressure, the piston 34 gradually moves into the air inlet 33. When the piston 34 exposes the second air inlet 332, gas enters the outer expansion sleeve 322 (in the second sealing cavity) through the second air inlet 332, causing the outer expansion sleeve 322 to expand until it is fully expanded. Then, the next step is performed.

[0048] Therefore, through the above structure in this embodiment, the inner expansion sleeve 321 and the outer expansion sleeve 322 can gradually expand, thereby enabling the sheath tube 5 to expand gradually, further improving the uniformity of the sidewall of the sheath tube 5 after expansion, and avoiding uneven expansion of the sheath tube 5 due to one-time expansion.

[0049] It should be noted that in this embodiment, the second air inlet 332 needs to be connected to the outer expansion sleeve 322 via a tube passing through the side wall of the inner expansion sleeve 321. The tube needs to be sealed not only to the second air inlet 332, but also to the side wall of the inner expansion sleeve 321.

[0050] Additionally, a vent hole 334 is provided at the bottom of the air inlet 33. The vent hole 334 directly passes through the other end of the main pipe 31 along the axis and connects to the outside, facilitating the smooth movement of the piston 34 towards the bottom of the air inlet 33, connecting the second air inlet 332 with the air inlet 33. When the inner expansion sleeve 321 and the outer expansion sleeve 322 are vented later, the gas in the inner expansion sleeve 321 directly enters the air inlet 33 through the first air inlet 331 and is then released. The gas in the outer expansion sleeve 322 is released through the second air inlet 332 and then through the vent hole 334.

[0051] In order to improve the efficiency of the connection between the air inlet 33 and the air blowing device, a quick gas connector 36 is provided at the opening of the air inlet 33.

[0052] In another embodiment, the present invention also provides a method for using a heating tube expander, performed by the aforementioned heating tube expander, and further includes the following steps: The expansion sleeve 5 is placed around the expansion sleeve 32, and the air-blowing heating tube 3 with the expansion sleeve 5 is placed into the heating box 14 for heating. After heating is completed, the air-blowing heating tube 3, which is fitted with the sheath tube 5 to be expanded, is inserted into the limiting tube 21; Then, air is blown from the air inlet 33 to the expansion sleeve 32, causing the expansion sleeve 32 to inflate and push the expansion sleeve tube 5 to expand. After the expansion sleeve tube 5 expands, it abuts against the inner wall of the limiting tube 21. Afterwards, the water spray pipe 22 sprays water onto the limiting pipe 21 to cool it down; Pull the air-blowing heating tube 3 out of the limiting tube 21, release the gas in the expansion sleeve 32 through the air-blowing port 33, then align the air-blowing heating tube 3 with the release tube 42, insert the release tube 42 into the air-blowing heating tube 3, and when the release tube 42 moves in the air-blowing heating tube 3, the release tube 42 acts on the outer wall of the expansion sleeve 32 to separate the expansion sleeve 32 from the expanded protective sleeve tube 5.

[0053] The working principle of this application is as follows, mainly consisting of the following stages: (1) Heating and softening stage: The EVA sheath tube 5 to be expanded is placed around the uninflated shrinkable expansion sleeve 32, and then the whole thing is placed into the heating box 14. The electric heating wire in the heating box 14 provides heat, while the motor 15 drives the support plate 12 to rotate, which drives the air blowing heating tube 3 on the basket 13 to rotate at a constant speed, ensuring that the sheath tube 5 is heated evenly and softened fully.

[0054] (2) Air expansion stage: After heating is completed, the air-blowing heating tube 3 with the sheath tube 5 is inserted into the limiting tube 21. Air is injected into the expansion sleeve 32 through the air blowing port 33. The expansion sleeve 32 gradually expands and radially pushes the softened sheath tube 5 until the outer wall of the sheath tube 5 is tightly abutted against the inner wall of the limiting tube 21. In this process, the limiting tube 21 serves as both a molding mold and a size limiting function.

[0055] (3) Cooling and shaping stage: The water spray pipe 22 continuously sprays water to the outside of the limiting pipe 21. The water flows from top to bottom along the inclined wall of the limiting pipe 21, and carries away heat through heat exchange, so that the sheath pipe 5 that is close to the inner wall of the limiting pipe 21 is quickly cooled and shaped, and the pipe diameter and wall thickness are kept uniform after expansion.

[0056] (4) Tube separation stage: After cooling, release the gas in the expansion sleeve 32 and pull the blowing heating tube 3 out from the limiting tube 21. Then align it with the tube 42 and insert the tube 42 into the blowing heating tube 3. Use the mechanical action of the tube 42 to separate the expansion sleeve 32 from the side wall of the expanded sheath tube 5 to avoid adhesion.

[0057] Compared with the prior art, this application has the following advantages: (1) Improve product dimensional accuracy and wall thickness uniformity: The expansion process is rigidly constrained by the limiting tube 21 to ensure that the outer diameter of the sheath tube 5 after expansion is consistent with the inner diameter of the limiting tube 21, and the wall thickness of each part is uniform, thereby improving product quality and consistency.

[0058] (2) Uniform heating to avoid local deformation: The support plate 12 inside the heating box 14 drives the air-blowing heating tube 3 to rotate. Combined with the basket 13, the opening is always facing upward under the action of gravity, which not only ensures convenient loading and unloading, but also makes the sheath tube 5 continuously flip during the heating process to avoid material deformation or performance degradation caused by local overheating.

[0059] (3) Optimize cooling efficiency and save water resources: The limiting pipe 21 is set at an angle, and after the water spray pipe 22 sprays water, the water flows slowly down the pipe wall, which prolongs the contact heat exchange time between the water and the limiting pipe 21; at the same time, the water collection tank 23 works with the water pump to realize the recycling of cooling water, reducing energy consumption and water cost.

[0060] (4) Achieving graded expansion and further improving expansion quality: The double-layer sheath structure of inner expansion sleeve 321 and outer expansion sleeve 322 is adopted, and the linkage design of piston 34 and spring 35 is combined to achieve graded expansion with the inner layer expanding first and the outer layer expanding later. This allows the sheath tube 5 to be subjected to a gradual thrust, avoiding the risk of uneven wall thickness or rupture caused by one-time violent expansion.

[0061] (5) Protect the surface quality of the product: The inlet end of the limiting tube 21 is equipped with a support wheel 25, which reduces the friction between the outer wall of the sheath tube 5 and the tube opening when the blowing heating tube 3 is inserted, effectively preventing surface wear or scratches.

[0062] (6) Effectively solves the problem of adhesion of the inner wall of the sleeve: The specially designed tube removal device 4 uses the mechanical action of inserting the tube removal tube 42 into the air heating tube 3 to separate the expansion sleeve 32 from the side wall of the protective tube 5, avoiding product scrap due to adhesion after thermal expansion, and improving the yield and ease of operation.

[0063] (7) Easy to operate and suitable for mass production: The overall structure is reasonably designed, and the processes of picking, placing, positioning, inflation, cooling and tube removal are easy to operate manually, which is suitable for continuous production needs.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heating-type tube expander, characterized in that, include: Heating device, the heating device including a heating chamber; A pipe expansion cooling device, comprising a limiting pipe and a plurality of water spray pipes arranged along the length direction of the limiting pipe; An air-blowing heating tube includes a main tube, an expansion sleeve disposed around the main tube, and an air-blowing port disposed at the end of the main tube and communicating with the expansion sleeve. The process involves placing the sheath to be expanded around the expansion sleeve and then placing it inside the heating box for heating. After heating, the air-blowing heating pipe with the sheath to be expanded is inserted into the limiting tube. Then, air is blown from the air outlet onto the expansion sleeve, causing the expansion sleeve to inflate and push the sheath to be expanded to expand. Afterward, water is sprayed onto the limiting tube to cool it down. The air-blowing heating pipe is then pulled out of the limiting tube, and the expanded sheath is removed from the outer wall of the air-blowing heating pipe.

2. The heating-type tube expander according to claim 1, characterized in that, The heating device includes a heating shaft disposed in the heating box and support plates fixedly disposed at both ends of the heating shaft along its length. Several baskets are rotatably disposed on the opposite surfaces of the two support plates, and the baskets maintain an upward opening under their own weight.

3. The heating-type tube expander according to claim 2, characterized in that, The baskets on the two support plates are respectively set; The two ends of the air-blowing heating tube are placed on the baskets of the two support plates respectively.

4. The heating-type tube expander according to claim 3, characterized in that, The suspended platform includes a suspended platform, on which a horizontal plate and vertical plates are vertically arranged at both ends; The hanging plate is provided with a rotating shaft that is rotatably connected to the support plate.

5. The heating-type tube expander according to claim 1, characterized in that, The expansion tube cooling device includes a water collection tank, the top of which has an opening, and the limiting tube is inclinedly disposed at the opening, with the inlet end of the limiting tube being the top end.

6. The heating-type tube expander according to claim 5, characterized in that, The water collection tank is equipped with a water pump, the outlet of which is connected to the main return water pipe, which is connected to several sprinkler pipes.

7. The heating-type tube expander according to claim 5, characterized in that, A support wheel is provided below the inlet end of the limiting tube.

8. The heating-type tube expander according to claim 1, characterized in that, It also includes a tube removal device, which includes an operating table and a tube removal device disposed on the operating table; The diameter of the sheathing tube is D1, and the inner diameter of the expanded sheathing tube is D2, wherein D1 is smaller than D2.

9. The heating-type tube expander according to claim 8, characterized in that, A support tube is provided on the operating table; One end of the unsleeving tube is inserted into the support tube, and a support frame is provided on the bottom periphery of the other end of the unsleeving tube. A unsleeving wheel is rotatably mounted on the support frame; the unsleeving wheel is located below the unsleeving tube.

10. A method of using a heating-type tube expander, characterized in that, Performed by the heating tube expander according to claim 8 or 9, the procedure further includes the following steps: The sheath tube to be expanded is placed around the expansion sleeve, and the air-blowing heating tube with the sheath tube to be expanded is placed into the heating box for heating. After heating is complete, the air-blowing heating tube, which is fitted with the sheath to be expanded, is inserted into the limiting tube. Then, air is blown into the expansion sleeve through the air inlet, causing the expansion sleeve to inflate and push the expansion sheath tube to expand. After the expansion sheath tube expands, it abuts against the inner wall of the limiting tube. Afterwards, the sprinkler pipe sprays water onto the limiting pipe to cool it down; Pull the air-blowing heating tube out of the limiting tube, release the gas in the expansion sleeve through the air-blowing port, align the air-blowing heating tube with the release tube, insert the release tube into the air-blowing heating tube, and when the release tube moves in the air-blowing heating tube, the release tube acts on the outer wall of the expansion sleeve to separate the expansion sleeve from the expanded protective sleeve tube.

Images