Hot melting device for end part of RTP (Resin Transfer Polymer) pipe

Abstract

The utility model discloses an end hot melting device for RTP pipes, and belongs to the technical field of pipe machining. The heating device comprises a heating outer sleeve used for being arranged outside a pipe in a sleeving mode, a heating inner core used for being inserted into the pipe and a gas spraying assembly, the heating outer sleeve comprises a sleeve body and a first heating unit arranged on the inner wall of the sleeve body in a surrounding mode, and the first heating unit can heat the outer wall of the pipe; the heating inner core comprises a plugging cover connected with the end of the sleeve body and a second heating unit arranged on the plugging cover, and the second heating unit can heat the inner wall of the pipe body. The gas spraying assembly comprises a gas conveying barrel connected with the plugging cover and a first gas conveying unit, the first gas conveying unit is arranged on the gas conveying barrel, the first gas conveying unit can spray gas relative to the top of the pipe, hot melting collapse of the pipe is hindered, and uniform distribution of heat is promoted. The top of the pipe can be prevented from collapsing, and heat diffusion and gas circulation in a pipeline are promoted.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing technology, and in particular to an end heat fusion device for RTP pipes. Background Technology

[0002] Reinforced thermoplastic pipe (RTP) was developed in the early 1990s. It mainly consists of a three-layer structure: the inner and outer layers are made of PE80 or higher grade materials, and the middle layer is a reinforcing strip made of composite reinforcing materials. Compared with ordinary plastic composite pipes, RTP has advantages such as high pressure resistance, good toughness, ease of installation and laying, and low overall cost. It enables the transportation and construction of medium and large diameter high-pressure pipes in roll packaging. Each roll has a long continuous length, greatly reducing the number of joints between pipes. Compared with fixed-length pipes, construction speed is greatly improved, and transportation and construction costs are significantly reduced.

[0003] Typically, the ends of RTP pipes need to be flared outwards to facilitate subsequent processes. Existing hot-melt devices mainly use an outer ring electric heating method inserted into the encased furnace body to heat the ends of the pipes, enhancing their thermoplasticity so that the ends can be flared outwards.

[0004] Existing hot melt equipment has the following problems:

[0005] First, the existing hot-melt equipment has low and uneven heating efficiency, which affects the quality and efficiency of turning the ends of RTP pipes outward.

[0006] Second, the ends of existing RTP pipes are prone to denting downwards under gravity, which is not conducive to subsequent outward turning. Utility Model Content

[0007] In view of this, it is necessary to provide an end heat fusion device for RTP pipes to solve the problem that existing heat fusion devices heat slowly and unevenly, which easily leads to the collapse of the top of the pipe.

[0008] This utility model provides an end heat fusion device for RTP pipes, comprising:

[0009] A heating jacket is used to cover the outside of a pipe. The heating jacket includes a sleeve body and a first heating unit disposed around the inner wall of the sleeve body. The first heating unit is capable of heating the outer wall of the pipe.

[0010] A heating inner core is used to be inserted into the inside of a pipe. The heating inner core includes a sealing cap connected to the end of the sleeve and a second heating unit disposed on the sealing cap. The second heating unit can heat the inner wall of the pipe.

[0011] The air jet assembly includes an air delivery cylinder connected to the sealing cap and a first air delivery unit. The first air delivery unit is disposed on the air delivery cylinder and can spray air relative to the top of the pipe to prevent the pipe from melting and collapsing and to promote uniform heat distribution.

[0012] Furthermore, the first gas delivery unit includes a plurality of first jet holes, which are equidistantly arranged along the axial direction of the gas delivery cylinder. The gas ejected from the first jet holes contacts the inner wall of the pipe via the second heating unit.

[0013] Furthermore, the gas delivery cylinder is provided with a second gas delivery unit, and multiple sets of the second gas delivery units are arranged around the axis of the gas delivery cylinder; the second gas delivery unit includes multiple second gas delivery holes, which are equidistantly arranged along the axial direction of the gas delivery cylinder, and the gas ejected from the second gas delivery holes contacts the inner wall of the pipe through the second heating unit.

[0014] Furthermore, the gas delivery cylinder body is provided with an exhaust port at the end away from the sealing cover, which can guide the gas located in the pipe body to diffuse outward.

[0015] Furthermore, the second heating unit includes multiple heating elements arranged around the gas delivery cylinder, each heating element capable of emitting heat, and the first gas delivery unit and the second gas delivery unit are respectively disposed between the two heating elements.

[0016] Furthermore, the first heating unit includes heat-conducting fins and a heating tube. A plurality of heat-conducting fins are equidistantly arranged around the central axis of the cylinder, and the heating tube is spirally inserted into the heat-conducting fins. The heat-conducting fins can uniformly conduct heat from the heating tube.

[0017] Furthermore, the inner side of the sleeve is provided with a heat insulation layer.

[0018] Furthermore, the sealing cap is connected to the sleeve via a hinge, and the sealing cap can move relative to one side of the sleeve to separate the heating outer jacket from the heating inner core.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The present invention provides an end heat-melting device for RTP pipe, comprising a heating jacket, which is fitted over the outside of the pipe for heating the outer wall. The heating jacket includes a sleeve body and a first heating unit. The end of the pipe is inserted into the sleeve body. The first heating unit is located in the gap between the pipe and the sleeve body. The first heating unit is arranged around the inner wall of the sleeve body to form a ring structure, which can uniformly heat various areas of the outer wall of the pipe and melt the pipe.

[0021] (2) The present invention provides an end heat-melting device for RTP pipes, which includes a heating inner core inserted inside the pipe for heating the inner wall. The heating inner core includes a sealing cap and a second heating unit. The sealing cap is connected to the end of the sleeve to form a relatively closed space, which can limit the end of the pipe to ensure the length of the pipe being heated and also prevent heat loss, thereby improving heating efficiency. The second heating unit is located on the sealing cap and is inserted inside the pipe to heat the inner wall of the pipe and melt the pipe.

[0022] (3) The present invention provides an end heat-fusion device for RTP pipe, which is equipped with an air-jet assembly. The air-jet assembly includes an air-transmitting cylinder and a first air-transmitting unit. The air-transmitting cylinder is connected to a sealing cap, and the first air-transmitting unit is disposed on the air-transmitting cylinder. The first air-transmitting unit can spray air relative to the top of the pipe, using gas pressure to support the relatively soft pipe after heat fusion. The airflow pressure counteracts the sag of the softened material due to its own weight, while accelerating the heat convection exchange in the top area and eliminating local overheating areas. The first air-transmitting unit can also promote the heat diffusion and uniform distribution of the second heating unit, promoting uniform heating of the pipe. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 is a three-dimensional structural schematic diagram of this utility model;

[0025] Figure 2 This is a side view of the structure of this utility model;

[0026] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 4 This is an exploded view of the entire utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the gas injection assembly in this utility model;

[0029] Figure 6 This is a schematic diagram of the heating core structure in this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the heating jacket in this utility model.

[0031] In the diagram, 100 is the heating jacket; 110 is the jacket body; 111 is the insulation layer; 120 is the first heating unit; 121 is the heat-conducting fins; and 122 is the heating tube.

[0032] 200. Heating core; 210. Sealing cap; 220. Second heating unit; 221. Heating element;

[0033] 300, Air injection assembly; 310, Air delivery cylinder; 311, Exhaust port; 320, First air delivery unit; 321, First air jet port; 330, Second air delivery unit; 331, Second air delivery port. Detailed Implementation

[0034] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0035] This embodiment describes an end-heat fusion device for RTP pipes, relating to the field of pipe processing technology. By simultaneously heating the interior of the pipe, heating efficiency can be improved. Utilizing airflow to impact the top of the pipe can prevent top collapse, promoting heat diffusion and gas circulation within the pipe.

[0036] Please see Figures 1 to 7 The end heat-fusion device for an RTP pipe in this embodiment includes a heating jacket 100, a heating inner core 200, and a gas spray assembly 300. The heating jacket 100 can heat the outer wall of the pipe, the heating inner core 200 can heat the inner wall of the pipe, and the gas spray assembly 300 can use high-pressure gas to prevent the top of the pipe from collapsing, thereby promoting heat diffusion and gas circulation inside the pipe.

[0037] The heating jacket 100 is fitted over the outside of the pipe to heat the outer wall. The heating jacket 100 includes a sleeve body 110 and a first heating unit 120. The end of the pipe is inserted into the sleeve body 110. The first heating unit 120 is located in the gap between the pipe and the sleeve body 110. The first heating unit 120 is arranged around the inner wall of the sleeve body 110 to form a ring structure, which can uniformly heat all areas of the outer wall of the pipe and melt the pipe.

[0038] A heating core 200 is inserted into the inside of the pipe to heat the inner wall. The heating core 200 includes a sealing cap 210 and a second heating unit 220. The sealing cap 210 is connected to the end of the sleeve 110 to form a relatively closed space, which can limit the end of the pipe to ensure the length of the pipe to be heated; it can also prevent heat loss and improve heating efficiency. The second heating unit 220 is disposed on the sealing cap 210 and is inserted into the inside of the pipe to heat the inner wall of the pipe and melt the pipe.

[0039] The air jet assembly 300 includes an air delivery cylinder 310 and a first air delivery unit 320. The air delivery cylinder 310 is connected to the sealing cap 210. The first air delivery unit 320 is disposed on the air delivery cylinder 310. The first air delivery unit 320 can spray air relative to the top of the pipe, using gas pressure to support the relatively soft and molten pipe. The airflow pressure counteracts the sag of the softened material due to its own weight, while accelerating heat convection exchange in the top area and eliminating localized overheating areas. The first air delivery unit 320 can also promote the heat diffusion and uniform distribution of the second heating unit 220, promoting uniform heating of the pipe.

[0040] In some embodiments, please refer to Figures 3 to 5 The first gas delivery unit 320 includes multiple first jet holes 321, which are equidistantly arranged along the axial direction of the gas delivery cylinder 310. Each first jet hole 321 can eject gas relative to the top of the gas delivery cylinder 310, using the gas impact to suppress the relatively soft and melted pipe material from sinking and maintain the roundness of the pipe end. The gas ejected from the first jet holes 321 comes into contact with the inner wall of the pipe through the second heating unit 220, where it is heated to form a hot, high-pressure airflow. This airflow provides support to the top of the pipe wall.

[0041] In practical implementation, the gas delivery cylinder 310 is a metal or ceramic tubular body. Multiple first jet holes 321 are equidistantly arranged along the axial direction of the gas delivery cylinder 310. Each first jet hole 321 refers to a perforated structure on the surface of the gas delivery cylinder 310, specifically a circular or flat hole with a diameter ranging from 0.5 to 2 mm, used to deliver airflow to the inner wall of the pipe. The equidistant arrangement means that the multiple first jet holes 321 are arranged at a fixed interval along the axial direction of the gas delivery cylinder 310, which can be achieved through machining or laser drilling to ensure uniform airflow distribution.

[0042] It should be noted that the end of the gas cylinder 310 near the sealing cover 210 is connected to the air pump through a pipe. The air pump can blow high-pressure gas into the gas cylinder 310 to ensure the gas supply of the gas cylinder 310.

[0043] Specifically, during the heating process, gas is continuously ejected through the first jet holes 321, with the airflow direction towards the top region of the pipe. Upon contact with the second heating unit 220, the gas temperature rises, and then it comes into contact with the inner wall of the pipe, forming a dynamic heat exchange. Through the equidistantly distributed first jet holes 321, the airflow can cover the axial length of the inner wall of the pipe, preventing uneven softening of the material due to concentrated heat in localized areas. Simultaneously, the upward force generated by the airflow can counteract the tendency of the pipe to collapse due to gravity.

[0044] Compared to existing technologies, traditional hot-melt devices typically rely solely on external heating and lack active heat conduction control over the inner wall of the pipe, resulting in uneven heat distribution and an inability to suppress collapse. This solution achieves simultaneous heating of the inner and outer walls of the pipe through axially equidistant air jets, combined with the heat conduction effect of the heated inner core 200, while dynamically adjusting the temperature field distribution using airflow.

[0045] In some embodiments, please refer to Figure 4 The gas delivery cylinder 310 is provided with a second gas delivery unit 330. Multiple sets of second gas delivery units 330 are arranged around the axis of the gas delivery cylinder 310. Each set of second gas delivery units 330 includes multiple second gas delivery holes 331. The multiple second gas delivery holes 331 are equidistantly arranged along the axial direction of the gas delivery cylinder 310. The gas ejected from the second gas delivery holes 331 passes through the second heating unit 220. The high-pressure gas heated by the second heating unit 220 can contact the inner wall of the pipe, promote the transfer and diffusion of heat, and achieve uniform heating of the inner wall of the pipe.

[0046] In practical implementation, the second gas delivery unit 330 includes multiple gas injection structures circumferentially distributed around the gas delivery cylinder 310. These can be implemented using a ring-shaped array of holes, forming an airflow layer surrounding the inner wall of the pipe through multiple injection units. The second gas delivery holes 331 refer to jet holes spaced apart along the axial direction of the gas delivery cylinder 310. Specifically, they can be circular holes with a diameter between 1 mm and 3 mm, forming a continuous airflow coverage area through axially equidistant arrangement. The arrangement around the axis of the gas delivery cylinder 310 means that multiple sets of second gas delivery units 330 are distributed in a ring array around the outer periphery of the gas delivery cylinder 310. Specifically, this can be achieved by setting one set at intervals of 30 degrees to 90 degrees, ensuring the uniformity of the circumferential airflow distribution.

[0047] Specifically, when the gas delivery cylinder 310 delivers gas into the pipe, multiple sets of second gas delivery holes 331 in the second gas delivery unit 330 simultaneously eject gas along the axial and circumferential directions. The gas is heated as it passes through the second heating unit 220, and then contacts the inner wall of the pipe, forming a layer of hot airflow surrounding the inner wall. The circumferentially distributed multiple second gas delivery units 330 prevent excessively strong or weak airflow in localized areas, while the axially equidistant second gas delivery holes 331 ensure uniform airflow distribution along the length of the pipe. The heat transfer rate in all areas of the inner wall of the pipe tends to be consistent, and the upward-ejected airflow counteracts the downward collapse tendency of the pipe due to gravity.

[0048] Compared to existing technologies, conventional hot-melt devices rely solely on unidirectional airflow for heat conduction, which can easily lead to uneven heating of the pipe's circumference. This solution, however, utilizes multiple sets of second air delivery units 330 distributed around the axis, ensuring uniform airflow distribution in both the circumferential and axial dimensions. Compared to solutions with only top air jets, the circumferential airflow can simultaneously compensate for heat loss in the pipe's sidewall area, preventing localized overheating or underheating.

[0049] In some embodiments, please continue reading Figure 4 The gas cylinder body 310 has an exhaust port 311 at the end away from the sealing cover 210. The exhaust port 311 can release gas from the end away from the sealing cover 210, thereby generating negative pressure, guiding the gas in the pipe body to diffuse outward, and preventing heat from accumulating at the end of the pipe and causing the pipe to overheat. At the same time, it can also discharge and collect harmful gases generated during the melting process of the pipe.

[0050] In practical implementation, the exhaust port 311 refers to the gas channel located at the end of the gas delivery cylinder 310. It can be implemented using an array of circular holes with a diameter of 1-3 mm, whose axis forms a 30-60 degree angle with the extending direction of the gas delivery cylinder 310. The exhaust port 311 creates a negative pressure area during gas ejection, accelerating gas flow inside the pipe. Harmful gases refer to volatile organic compounds or decomposition gases produced during the thermal melting process, specifically including flammable gases such as methane and ethylene produced by the thermal decomposition of polyethylene materials. The gas velocity ejected from the exhaust port 311 can be controlled at 0.5-2 m / s, ensuring effective removal of harmful gases while avoiding excessive cooling of the pipe material.

[0051] Specifically, when the gas delivery cylinder 310 is inserted into the pipe, the exhaust port 311 is located outside the open end of the pipe. During the heat fusion process, the heat generated by the second heating unit 220 softens the inner wall material of the pipe. At this time, the gas produced by the decomposition of the material forms a pressure gradient inside the gas delivery cylinder 310. The exhaust port 311 continuously ejects compressed air to form a directional airflow, which guides the gas molecules accumulated at the end of the pipe along the outer surface of the gas delivery cylinder 310. During this process, the jet direction of the exhaust port 311 forms an angle with the axis of the pipe, so that harmful gases are guided to a safe area away from the heating zone.

[0052] Compared to existing technologies, traditional hot-melt devices lack a dedicated structure for venting harmful gases, leading to the accumulation of decomposition gases at the pipe ends, which may cause material oxidation and degradation or the formation of bubble defects. This solution actively vents harmful substances through directional airflow, while avoiding the structural complexity caused by adding additional exhaust equipment.

[0053] In some embodiments, please refer to Figure 6 The second heating unit 220 includes multiple heating elements 221 arranged around the gas delivery cylinder 310. Each heating element 221 emits heat and can heat a section of the inner wall of the pipe. The combined effect of the multiple heating elements 221 achieves sufficient heating of the inner wall of the pipe. The first gas delivery unit 320 and the second gas delivery unit 330 are respectively disposed between the two heating elements 221. The gas ejected from the first gas delivery unit 320 and the second gas delivery unit 330 is fully heated as it passes between the two heating elements 221. The gas heats the inner wall of the pipe through convection, promoting uniform heat distribution.

[0054] In practical implementation, heating element 221 refers to an independent heating element distributed circumferentially around the heating core 200. It can be implemented using resistance wire or ceramic heating rod, forming a uniform heat field through a ring arrangement. Multiple heating elements 221 are arranged in a ring, each capable of independently heating a section of the inner wall of the pipe; the cumulative effect of the number increases heating efficiency. Several independent heating elements 221 are evenly distributed circumferentially on the surface of the heating core 200, for example, six heating elements 221 arranged in a ring at 60-degree intervals. Installation space is reserved between adjacent heating elements 221, and the jet holes of the first air supply unit 320 and the second air supply unit 330 are respectively embedded in these gaps. The heating elements 221 can heat the air passing through their gaps, achieving convective heating of the inner wall of the pipe.

[0055] Specifically, when the heating element 221 radiates heat to the inner wall of the pipe, the airflow from the gas delivery unit is ejected from the gaps between the heating elements 221. This avoids the airflow being directly blocked by the heating elements 221 and allows the gas to flow tangentially along the pipe wall. This arrangement ensures that heat is evenly transferred to the pipe wall through the annularly distributed heating elements 221, while the gas injection path and the heating area form a complementary distribution, which promotes heat diffusion and suppresses softening and deformation of the pipe through airflow pressure.

[0056] Compared with existing technologies, conventional hot-melt devices typically employ a single annular heating coil or a continuous spiral heating wire, resulting in uneven circumferential heating of the pipe and restricted airflow path. This solution, through the alternating arrangement of discrete heating elements 221 and gas delivery units, simultaneously achieves uniform heat field distribution and directional airflow control within a limited space, overcoming the shortcomings of traditional structures such as low heat conduction efficiency and large airflow interference.

[0057] In some embodiments, please refer to Figure 7 The first heating unit 120 includes heat-conducting fins 121 and heating tube 122. Multiple heat-conducting fins 121 are equidistantly arranged around the central axis of the cylinder. The heating tube 122 is spirally inserted into the heat-conducting fins 121. The heat-conducting fins 121 can uniformly conduct heat from the heating tube 122, so that the outer wall of the tube is uniformly heated.

[0058] In practical implementation, the heat-conducting fins 121 refer to the metal heat dissipation structure distributed circumferentially along the inner wall of the sleeve 110. They can be made of aluminum alloy or copper alloy and arranged at equal intervals to form a ring-shaped heat dissipation array. The heat-conducting fins 121 increase the contact area with the outer wall of the tube, achieving uniform heat conduction. The heating tube 122 refers to a metal tube with a built-in heating wire. Specifically, it can be a nickel-chromium alloy tube spirally wound within the gaps of the heat-conducting fins 121. The spiral path extends the distribution range of the heat source within the sleeve 110, allowing heat to be transferred synchronously along the axial and radial directions.

[0059] Specifically, when the heating tube 122 is energized and generates heat, the heat is first transferred to each heat-conducting fin 121 through a spiral path. Since the heat-conducting fins 121 are equidistantly distributed along the central axis of the sleeve 110, the heat is evenly distributed to the annular area of ​​the inner wall of the sleeve 110. The outer wall of the tube is in direct contact with the heat-conducting fins 121, and the heat is transferred from the fins to the surface of the tube through thermal conduction. The spiral structure of the heating tube 122 forms a continuous heat source in the gaps between the heat-conducting fins 121, avoiding excessive local temperature that could lead to carbonization of the tube surface. The heat insulation layer 111 on the inner side of the sleeve 110 effectively reduces heat diffusion to the external environment, ensuring that the heat energy is concentrated for heating the ends of the tube.

[0060] Compared with existing technologies, the current hot-melt device uses a single annular heating element, resulting in uneven heat distribution. In contrast, this solution uses a combination of heat-conducting fins 121 and spiral heating tubes to form a synchronous axial and radial heat transfer path, eliminating local temperature differences. Traditional devices lack insulation structures, leading to heat loss. This solution uses an insulation layer 111 inside the sleeve 110 to confine heat to the heating area, improving heat utilization efficiency.

[0061] It should be noted that the inner side of the sleeve 110 is provided with a heat insulation layer 111. The heat insulation layer 111 can prevent heat from the heating tube 122 from being conducted to the sleeve 110, which can not only prevent heat loss and save energy, but also prevent staff from being burned.

[0062] In the specific implementation process, the heat insulation layer 111 refers to the heat insulation material layer attached to the inside of the sleeve 110. Specifically, it can be a ceramic fiber or aerogel composite material. By blocking the heat exchange between the sleeve 110 and the external environment, it reduces heat loss and maintains the temperature stability of the inner cavity of the sleeve 110.

[0063] Specifically, the insulation layer 111 is configured to cover the entire inner surface of the cylinder, maintaining a distance from the heat-conducting fins 121 and the heating tube 122. During heating, the heat generated by the heating tube 122 is transferred to the outer wall of the tube through the heat-conducting fins 121, while the insulation layer 111, with its low thermal conductivity, restricts heat diffusion to the outside of the cylinder, concentrating heat in the heating area of ​​the tube. Thus, the heat distribution inside the cylinder is confined between the heating unit and the tube, preventing energy loss due to heat absorption from the external environment, and simultaneously reducing the surface temperature of the cylinder to improve operational safety.

[0064] Compared to existing technologies, current hot-melt devices lack insulation, causing heat to dissipate rapidly into the external environment through the cylinder during heating. This not only reduces heating efficiency but also easily leads to excessively high cylinder surface temperatures, posing safety hazards. This solution, by adding an insulation layer 111, effectively prevents heat leakage, allowing heating energy to be more concentrated on the pipe material and significantly improving heat transfer efficiency.

[0065] In some embodiments, the sealing cap 210 is connected to the sleeve 110 via a hinge. The sealing cap 210 can move relative to one side of the sleeve 110 to separate the heating outer sleeve 100 from the heating inner core 200. With the help of the hinge, the sealing cap 210 can rotate relative to the sleeve 110, thereby opening and closing the inner cavity of the sleeve 110. The heating element 221 and the air delivery cylinder 310 are both connected to the sealing cap 210. The sealing cap 210 can move outwards to expose the heating element 221 and the air delivery cylinder 310, thereby facilitating maintenance personnel to maintain and care for the heating element 221 and the air delivery cylinder 310, and extending the service life of the heating inner core 200 and the air jet assembly 300.

[0066] In practical implementation, the hinge refers to the rotatable mechanical structure connecting the sealing cover 210 and the sleeve 110. Specifically, it can be implemented using a hinge structure with a pivot pin. The opening and closing action of the sealing cover 210 and the sleeve 110 is achieved through the rotational movement of the hinge. The hinge makes the separation operation of the heating inner core 200 and the heating outer sleeve 100 controllable, avoiding component deformation caused by forced disassembly.

[0067] Specifically, when it is necessary to remove the heating inner core 200 from the inside of the pipe, the operator can manually push the sealing cap 210 to rotate around the hinge, so that an opening gap is formed between the sealing cap 210 and the sleeve 110. At this time, the heating inner core 200 moves synchronously with the sealing cap 210 and completely separates from the heating outer sleeve 100 inside the sleeve 110, thereby avoiding the jamming phenomenon between the heating outer sleeve 100 and the heating inner core 200 due to thermal expansion.

[0068] Compared with existing technologies, the sealing cover 210 and the sleeve 110 of the traditional hot-melt device are fixedly connected. Disassembly requires the complete separation of the heating outer jacket 100 and the heating inner core 200, which limits the operating space and easily causes heat loss. In contrast, this solution uses the one-sided rotation characteristic of the hinge to separate the heating components with only partial movement. The operation does not require complete disassembly of the heating outer jacket 100, effectively reducing heat loss and shortening maintenance time.

[0069] Workflow: First, the end of the pipe is inserted into the heat fusion device. The heating jacket 100 mates with the outer wall of the pipe, and the heating inner core 200 mates with the inner wall of the pipe. Then, the heating element 221, the heating tube body 122, and the air pump are activated. The heating element 221 heats the inner wall of the pipe, and the heat-conducting fins 121 assist the heating tube body 122 in heating the outer wall of the pipe. High-pressure gas in the air delivery cylinder 310 is ejected from the first jet hole 321, the second air delivery hole 331, and the exhaust hole 311. The airflow pressure counteracts the downward sag of the softened material due to its own weight, accelerates heat convection exchange in the heating area, and promotes heat dispersion. Finally, the heat fusion device is detached from the heated and softened end of the pipe, and the end of the pipe is processed into a flared structure using spinning or die forming.

[0070] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. An end heat fusion device for RTP pipes, characterized in that, include: A heating jacket is used to cover the outside of a pipe. The heating jacket includes a sleeve body and a first heating unit disposed around the inner wall of the sleeve body. The first heating unit is capable of heating the outer wall of the pipe. A heating inner core is used to be inserted into the inside of a pipe. The heating inner core includes a sealing cap connected to the end of the sleeve and a second heating unit disposed on the sealing cap. The second heating unit can heat the inner wall of the pipe. The air jet assembly includes an air delivery cylinder connected to the sealing cap and a first air delivery unit. The first air delivery unit is disposed on the air delivery cylinder and can spray air relative to the top of the pipe to prevent the pipe from melting and collapsing and to promote uniform heat distribution.

2. The end heat fusion device for RTP pipe according to claim 1, characterized in that, The first gas delivery unit includes a plurality of first jet holes, which are equidistantly arranged along the axial direction of the gas delivery cylinder. The gas ejected from the first jet holes contacts the inner wall of the pipe via the second heating unit.

3. An end heat fusion device for RTP pipe according to claim 1 or 2, characterized in that, The gas delivery cylinder is provided with a second gas delivery unit, and multiple sets of the second gas delivery units are arranged around the axis of the gas delivery cylinder; the second gas delivery unit includes multiple second gas delivery holes, which are equidistantly arranged along the axial direction of the gas delivery cylinder, and the gas ejected from the second gas delivery holes contacts the inner wall of the pipe through the second heating unit.

4. The end heat fusion device for RTP pipe according to claim 3, characterized in that, The gas delivery cylinder has an exhaust port at one end away from the sealing cover, which can guide the gas in the cylinder to diffuse outward.

5. The end heat fusion device for RTP pipe according to claim 4, characterized in that, The second heating unit includes multiple heating elements arranged around the gas delivery cylinder. The heating elements are capable of emitting heat. The first gas delivery unit and the second gas delivery unit are respectively disposed between the two heating elements.

6. The end heat fusion device for RTP pipe according to claim 1, characterized in that, The first heating unit includes heat-conducting fins and a heating tube. A plurality of heat-conducting fins are equidistantly spaced around the central axis of the cylinder. The heating tube is spirally inserted into the heat-conducting fins. The heat-conducting fins can uniformly conduct heat from the heating tube.

7. The end heat fusion device for RTP pipe according to claim 6, characterized in that, The inner side of the sleeve is provided with a heat insulation layer.

8. The end heat fusion device for RTP pipe according to claim 1, characterized in that, The sealing cap is connected to the sleeve via a hinge, and the sealing cap can move relative to one side of the sleeve to separate the heating outer jacket from the heating inner core.

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