Prefabricated directly-buried thermal insulation pipe hot melting sleeve welding joint coating connecting device

Abstract

The invention discloses a prefabricated directly-buried thermal insulation pipe hot melting sleeve welding joint coating connecting device which comprises a first pipeline, a second pipeline and a hot melting sleeve, the first pipeline and the second pipeline are connected through the hot melting sleeve, the first pipeline and the second pipeline each comprise a pipeline body, second teeth are arranged on the outer side of the end of each pipeline body, and the second teeth are arranged on the outer side of the end of each pipeline body. First teeth and third teeth are arranged at the two ends, located at the second teeth, of the pipeline main body; the hot melting sleeve comprises a hot melting sleeve body, the two ends of the hot melting sleeve body are provided with inserting grooves allowing the pipeline to be inserted therein, fifth teeth matched with the second teeth are formed in the positions, located in the inserting grooves, of the hot melting sleeve body, and sixth teeth matched with the third teeth are arranged in the positions, located in the inserting grooves, of the hot melting sleeve body. And fourth teeth matched with the second teeth are arranged at one end, located at the second teeth, of the hot melting sleeve main body. According to the invention, through double fixation of mechanical interlocking of multiple groups of teeth and fusion of hot-melt molecules, the joint bonding strength is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of hot melt sleeve welding technology, specifically a hot melt sleeve welding joint connection device for prefabricated direct-buried insulated pipes. Background Technology

[0002] The method for patching the outer polyethylene protective layer of directly buried pipelines often adopts the electrofusion tape method. This involves placing a metal mesh around the outside of the two pipelines to be connected, and then placing an electrofusion tape around the outside of the connection point. By energizing the metal mesh, the electrofusion tape is heated from the inside, and a heat-shrinkable tape is added on the outside, thus achieving a double-layer protective structure of heat-shrinkable tape and electrofusion tape on the outer layer of the pipeline.

[0003] The existing announcement number CN218582583U discloses a seamless heat-shrinkable electrofusion welding structure for pipe repair sleeves, including: a working mother pipe, an insulation layer on the outside of the working mother pipe, a PE layer on the outside of the insulation layer, and a pipe repair sleeve connected to adjacent working mother pipes by welding. The pipe repair sleeve is located on the outside of the PE layer of the two adjacent mother pipes, covering the electrofusion welding wires at both ends. A filling space is provided between the pipe repair sleeve and the ends of the two working mother pipes, and a polyurethane foam layer is provided in the filling space. Thus, the pipe repair sleeve is produced as a whole without seams, and the material is similar to that of the working mother pipe. After the pipe repair sleeve is tightened and tightly bonded to the outside of the PE layer of the mother pipe by flame heating, the pipe repair sleeve and the PE layer of the mother pipe are then electrofused and welded by electric heating, resulting in a perfect joint between the interfaces.

[0004] The existing electrofusion method relies on the fusion of single hot-melt molecules and lacks a mechanical positioning structure. After welding, the joint is only connected by the molten layer, which has limited shear and peel resistance. It is prone to loosening and falling off due to long-term soil settlement and pipeline thermal expansion and contraction stress. Summary of the Invention

[0005] The purpose of this invention is to provide a welding joint connection device for hot melt sleeve of prefabricated direct-buried insulated pipes, so as to solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A prefabricated direct-buried insulated pipe hot-melt sleeve welding joint connection device includes a first pipe, a second pipe, and a hot-melt sleeve. The first pipe and the second pipe are connected by the hot-melt sleeve. Both the first pipe and the second pipe include a pipe body. A second tooth is provided on the outer side of the end of the pipe body. A first tooth and a third tooth are provided at both ends of the pipe body located at the second tooth. The hot-melt sleeve includes a hot-melt sleeve body. Slots for pipe insertion are provided at both ends of the hot-melt sleeve body. A fifth tooth that mates with the second tooth is provided at the slot of the hot-melt sleeve body. A sixth tooth that mates with the third tooth is provided inside the slot of the hot-melt sleeve body. A fourth tooth that mates with the second tooth is provided at one end of the hot-melt sleeve body. An electrofusion wire is pre-embedded in the hot-melt sleeve body.

[0007] Preferably, the inner wall of one end of the pipe body is provided with a diameter-changing section, and the hot melt sleeve body is provided with an inclined part that cooperates with the diameter-changing section at the slot.

[0008] Preferably, it also includes a frame and a sliding frame, wherein at least two fixing components are installed on one side of the top of the frame, and two guide rods are installed on the other side of the top of the frame, the sliding frame is slidably mounted on the two guide rods, the sliding frame is equipped with at least two fixing components, and the frame is equipped with a driving component for driving the sliding frame to reciprocate.

[0009] Preferably, the fixing component includes an upper clamping plate, a lower clamping plate, and a locking component. The upper and lower clamping plates are both semi-circular structures. One end of the upper and lower clamping plates after docking is connected by a hinge, and the other end of the upper and lower clamping plates after docking is locked by the locking component.

[0010] Preferably, the fixing component includes an upper clamping plate, a lower clamping plate, and a locking component. The upper and lower clamping plates are both semi-circular structures. Both ends of the upper and lower clamping plates after docking are locked by the locking component. Multiple fixing rods are installed at equal intervals on the upper and lower clamping plates, and each fixing rod is equipped with at least one limiting clamping bolt.

[0011] The outer side of the hot melt sleeve body is integrally formed with a polyurethane foam insulation layer. The two ends of the polyurethane foam insulation layer are provided with stepped overlapping surfaces. The outer side of the first tooth of the pipe body is provided with an insulation layer overlapping groove that is compatible with the polyurethane foam insulation layer. The outer side of the polyurethane foam insulation layer is covered with a high-density polyethylene anti-corrosion outer protective layer.

[0012] The locking assembly includes a locking bolt and a locking nut, and the mating ends of the upper and lower clamps are provided with connecting lugs that are adapted to the locking bolt.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The connection strength far surpasses traditional methods, offering superior resilience: Traditional hot-melt repair relies solely on molecular fusion, resulting in limited shear and peel resistance. This device, through a dual fixation mechanism of "multiple sets of interlocking teeth and molecular fusion," significantly enhances joint strength, effectively resisting stresses caused by soil subsidence and pipeline thermal expansion and contraction. It is less prone to loosening or detachment with long-term use. The interlocking tooth structure forms a "physical barrier," ensuring that even if the hot-melt layer suffers localized damage under extreme conditions, the teeth still provide auxiliary fixation, reducing the risk of repair failure.

[0014] With extremely reliable sealing performance and excellent corrosion protection, the precise meshing of the teeth fills radial gaps, and the adaptation of the variable diameter section and inclined section eliminates axial gaps. Combined with the uniform coverage of the molten layer after heat fusion, a "no dead angle seal" is formed, which can effectively prevent moisture and soil impurities from penetrating the outer protective layer of the pipeline, solving the problem of corrosion failure caused by poor adhesion in traditional joints. The heat fusion sleeve and the pipeline are made of the same material (both are polyethylene), which has good compatibility after melting, with no risk of delamination or cracking, and stronger sealing durability.

[0015] The auxiliary fixing mechanism achieves "mechanized positioning": the alignment of the pipe is adjusted by the drive component to avoid errors caused by manual alignment; the standardized clamping design of the fixing components eliminates the need to rely on the experience of construction personnel to judge the tightness of the fit, resulting in high consistency of welding quality and reducing false welds and missed welds caused by improper human operation.

[0016] Two fixing component solutions are available for flexible adaptation: the hinge-type solution is suitable for rapid construction and small to medium diameter pipes; the bolt-limiting solution is suitable for large diameter pipes and high-requirement working conditions. The strong adaptability reduces the construction difficulty in different scenarios.

[0017] The toothed and slotted guide design eliminates the need for complex calibration when inserting pipes into the heat fusion sleeve, resulting in high assembly efficiency. The semi-circular structure of the fixing component facilitates easy opening and closing, enabling quick on-site installation and disassembly. The heat fusion sleeve is an integrated prefabricated structure with evenly distributed pre-embedded heating wires, eliminating the need for additional on-site heating elements and reducing construction steps. For subsequent maintenance, the pipe can be quickly separated by loosening the fixing component, resulting in low maintenance costs.

[0018] It can be adapted to prefabricated direct-buried insulated pipes of different diameters. Whether it is a small-to-medium diameter municipal pipeline network or a large-diameter long-distance oil and gas pipeline, the joint connection can be achieved by replacing the corresponding specification of heat fusion sleeve and fixing components. The sealing and strength design meets the corrosion protection and insulation requirements of direct-buried pipelines. It is suitable for various scenarios such as urban heating, water supply and drainage, and oil and gas transportation, and is especially suitable for pipeline construction under complex geological conditions. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Fig. 1 This is a schematic diagram of the structure of the present invention; Fig. 2 This is a schematic diagram of the pipe structure of the present invention; Fig. 3 This is a schematic diagram of the structure of the heat-fusion sleeve of the present invention; Fig. 4 This is a structural schematic diagram of the framework of this invention; Fig. 5 This is a schematic diagram of the structure of the first fixing component of the present invention; Fig. 6 This is a schematic diagram of the structure of the second type of fixing component of the present invention.

[0020] In the diagram: 1. Frame; 2. Guide rod; 3. Sliding frame; 4. Drive component; 5. First pipe; 6. Fixing assembly; 7. Second pipe; 8. Heat fusion sleeve; 51. Pipe body; 52. First tooth; 53. Second tooth; 54. Third tooth; 55. Variable diameter section; 61. Upper clamp; 62. Lower clamp; 63. Locking assembly; 64. Fixing rod; 65. Limiting clamping bolt; 81. Heat fusion sleeve body; 82. Slot; 83. Fourth tooth; 84. Fifth tooth. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 a part of the embodiments of the present invention, not all of them. 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. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. Example

[0022] Please see Figs. 1-6In this embodiment of the invention, a prefabricated direct-buried insulation pipe hot-melt sleeve welding repair connection device includes a first pipe 5, a second pipe 7, and a hot-melt sleeve 8. The first pipe 5 and the second pipe 7 are connected by the hot-melt sleeve 8. Both the first pipe 5 and the second pipe 7 include a pipe body 51. A second tooth 53 is provided on the outer side of the end of the pipe body 51. A first tooth 52 and a third tooth 54 are provided at both ends of the pipe body 51 located at the second tooth 53. The hot-melt sleeve 8 includes a hot-melt sleeve body 81. Slots 82 for pipe insertion are provided at both ends of the hot-melt sleeve body 81. A fifth tooth 84 that mates with the second tooth 53 is provided at the slot 82 of the hot-melt sleeve body 81. A sixth tooth that mates with the third tooth 54 is provided inside the slot 82 of the hot-melt sleeve body 81. A fourth tooth 83 that mates with the second tooth 53 is provided at one end of the hot-melt sleeve body 81 located at the second tooth 53. An electrofusion wire is pre-embedded in the hot-melt sleeve body 81. The inner wall of one end of the pipe body 51 is provided with a variable diameter section 55, and the hot melt sleeve body 81 is provided with an inclined part that cooperates with the variable diameter section 55 at the slot 82.

[0023] Multiple sets of teeth precisely engage for positioning: A second tooth 53 is provided on the outer side of the end of the pipe body 51, with a first tooth 52 and a third tooth 54 respectively at its two ends; slots 82 for pipe insertion are provided at both ends of the heat fusion sleeve body 81, with a fifth tooth 84 at the slot 82, a sixth tooth inside, and a fourth tooth 83 corresponding to one end of the second tooth 53. During assembly, after the pipe is inserted into the slot 82, the first tooth 52, the second tooth 53, and the third tooth 54 precisely engage with the fourth tooth 83, the fifth tooth 84, and the sixth tooth respectively, restricting the relative displacement between the pipe and the heat fusion sleeve 8 in the radial and axial directions, and preventing welding misalignment.

[0024] The variable diameter section and the inclined part are adapted to fit together: a variable diameter section 55 is provided on the inner wall of one end of the pipe body 51, and an inclined part is provided at the slot 82 of the hot melt sleeve body 81. The two form a "wedge fit", which not only guides the pipe to be quickly inserted into place, but also fills the small gaps, ensuring that the pipe fits tightly with the inner wall of the hot melt sleeve 8, and eliminating the hidden danger of gaps in hot melt welding.

[0025] An electrofusion wire is pre-embedded in the hot melt sleeve body 81. After the pipe and the hot melt sleeve 8 are positioned by interlocking teeth, the electrofusion wire is energized. The heat generated by the electrofusion wire is evenly transferred to the contact surface between the hot melt sleeve body 81 and the pipe body 51, causing the polyethylene material in the contact area to melt and form a molecular layer. After the power is turned off and the material cools down, the molten molecules diffuse and intertwine with each other, solidifying to form a strong welded joint, irreversibly combining the first pipe 5, the second pipe 7 and the hot melt sleeve 8, providing both strength and sealing.

[0026] The outer side of the hot melt sleeve body 81 is integrally formed with a polyurethane foam insulation layer. The two ends of the polyurethane foam insulation layer are provided with stepped overlapping surfaces. The outer side of the first tooth 52 of the pipe body 51 is provided with an insulation layer overlapping groove that is compatible with the polyurethane foam insulation layer. The outer side of the polyurethane foam insulation layer is covered with a high-density polyethylene anti-corrosion outer protective layer.

[0027] It also includes a frame 1 and a sliding frame 3. At least two fixing components 6 are installed on one side of the top of the frame 1, and two guide rods 2 are installed on the other side of the top of the frame 1. The sliding frame 3 is slidably mounted on the two guide rods 2. The sliding frame 3 is equipped with at least two fixing components 6, and the frame 1 is equipped with a driving component 4 for driving the sliding frame 3 to reciprocate.

[0028] The fixing assembly 6 includes an upper clamping plate 61, a lower clamping plate 62, and a locking assembly 63. Both the upper and lower clamping plates 61 and 62 are semi-circular structures. Both ends of the upper and lower clamping plates 61 and 62 are locked by the locking assembly 63. Multiple fixing rods 64 are evenly spaced on both the upper and lower clamping plates 61 and 62, and each fixing rod 64 is equipped with at least one limiting clamping bolt 65. The upper and lower clamping plates 61 and 62 are locked by the locking assembly 63 after docking. The fixing rods 64 are evenly installed on the clamping plates, and each fixing rod 64 is equipped with at least one limiting clamping bolt 65. Adjusting the bolts can further tighten the pipe, achieving omnidirectional limiting and ensuring no relative displacement between the pipe and the hot melt sleeve 8 during welding. The locking assembly 63 includes locking bolts and locking nuts. The docking ends of the upper and lower clamping plates 61 and 62 are provided with connecting ears adapted to the locking bolts.

[0029] The working principle of this invention is: Multiple sets of teeth precisely engage for positioning: A second tooth 53 is provided on the outer side of the end of the pipe body 51, with a first tooth 52 and a third tooth 54 respectively at its two ends; slots 82 for pipe insertion are provided at both ends of the heat fusion sleeve body 81, with a fifth tooth 84 at the slot 82, a sixth tooth inside, and a fourth tooth 83 corresponding to one end of the second tooth 53. During assembly, after the pipe is inserted into the slot 82, the first tooth 52, the second tooth 53, and the third tooth 54 precisely engage with the fourth tooth 83, the fifth tooth 84, and the sixth tooth respectively, restricting the relative displacement between the pipe and the heat fusion sleeve 8 in the radial and axial directions, and preventing welding misalignment.

[0030] The variable diameter section and the inclined part are adapted to fit together: a variable diameter section 55 is provided on the inner wall of one end of the pipe body 51, and an inclined part is provided at the slot 82 of the hot melt sleeve body 81. The two form a "wedge fit", which not only guides the pipe to be quickly inserted into place, but also fills the small gaps, ensuring that the pipe fits tightly with the inner wall of the hot melt sleeve 8, and eliminating the hidden danger of gaps in hot melt welding.

[0031] An electrofusion wire is pre-embedded in the hot melt sleeve body 81. After the pipe and the hot melt sleeve 8 are positioned by interlocking teeth, the electrofusion wire is energized. The heat generated by the electrofusion wire is evenly transferred to the contact surface between the hot melt sleeve body 81 and the pipe body 51, causing the polyethylene material in the contact area to melt and form a molecular layer. After the power is turned off and the material cools down, the molten molecules diffuse and intertwine with each other, solidifying to form a strong welded joint, irreversibly combining the first pipe 5, the second pipe 7 and the hot melt sleeve 8, providing both strength and sealing.

[0032] The outer side of the hot melt sleeve body 81 is integrally formed with a polyurethane foam insulation layer. The two ends of the polyurethane foam insulation layer are provided with stepped overlapping surfaces. The outer side of the first tooth 52 of the pipe body 51 is provided with an insulation layer overlapping groove that is compatible with the polyurethane foam insulation layer. The outer side of the polyurethane foam insulation layer is covered with a high-density polyethylene anti-corrosion outer protective layer.

[0033] Pipe alignment adjustment: The device is equipped with a frame 1, a guide rod 2, a sliding frame 3, and a drive component 4. The sliding frame 3 can move back and forth along the guide rod 2. The first pipe 5 and the second pipe 7 are fixed on the frame 1 and the fixing component 6 of the sliding frame 3, respectively. The position of the sliding frame 3 is adjusted by the drive component 4 to precisely control the distance and coaxiality of the two pipes, avoiding uneven welding gaps caused by misalignment. Example

[0034] Please see Figs. 1-6 In this embodiment of the invention, a prefabricated direct-buried insulation pipe hot-melt sleeve welding repair connection device includes a first pipe 5, a second pipe 7, and a hot-melt sleeve 8. The first pipe 5 and the second pipe 7 are connected by the hot-melt sleeve 8. Both the first pipe 5 and the second pipe 7 include a pipe body 51. A second tooth 53 is provided on the outer side of the end of the pipe body 51. A first tooth 52 and a third tooth 54 are provided at both ends of the pipe body 51 located at the second tooth 53. The hot-melt sleeve 8 includes a hot-melt sleeve body 81. Slots 82 for pipe insertion are provided at both ends of the hot-melt sleeve body 81. A fifth tooth 84 that mates with the second tooth 53 is provided at the slot 82 of the hot-melt sleeve body 81. A sixth tooth that mates with the third tooth 54 is provided inside the slot 82 of the hot-melt sleeve body 81. A fourth tooth 83 that mates with the second tooth 53 is provided at one end of the hot-melt sleeve body 81 located at the second tooth 53. An electrofusion wire is pre-embedded in the hot-melt sleeve body 81. The inner wall of one end of the pipe body 51 is provided with a variable diameter section 55, and the hot melt sleeve body 81 is provided with an inclined part that cooperates with the variable diameter section 55 at the slot 82.

[0035] Multiple sets of teeth precisely engage for positioning: A second tooth 53 is provided on the outer side of the end of the pipe body 51, with a first tooth 52 and a third tooth 54 respectively at its two ends; slots 82 for pipe insertion are provided at both ends of the heat fusion sleeve body 81, with a fifth tooth 84 at the slot 82, a sixth tooth inside, and a fourth tooth 83 corresponding to one end of the second tooth 53. During assembly, after the pipe is inserted into the slot 82, the first tooth 52, the second tooth 53, and the third tooth 54 precisely engage with the fourth tooth 83, the fifth tooth 84, and the sixth tooth respectively, restricting the relative displacement between the pipe and the heat fusion sleeve 8 in the radial and axial directions, and preventing welding misalignment.

[0036] The variable diameter section and the inclined part are adapted to fit together: a variable diameter section 55 is provided on the inner wall of one end of the pipe body 51, and an inclined part is provided at the slot 82 of the hot melt sleeve body 81. The two form a "wedge fit", which not only guides the pipe to be quickly inserted into place, but also fills the small gaps, ensuring that the pipe fits tightly with the inner wall of the hot melt sleeve 8, and eliminating the hidden danger of gaps in hot melt welding.

[0037] An electrofusion wire is pre-embedded in the hot melt sleeve body 81. After the pipe and the hot melt sleeve 8 are positioned by interlocking teeth, the electrofusion wire is energized. The heat generated by the electrofusion wire is evenly transferred to the contact surface between the hot melt sleeve body 81 and the pipe body 51, causing the polyethylene material in the contact area to melt and form a molecular layer. After the power is turned off and the material cools down, the molten molecules diffuse and intertwine with each other, solidifying to form a strong welded joint, irreversibly combining the first pipe 5, the second pipe 7 and the hot melt sleeve 8, providing both strength and sealing.

[0038] It also includes a frame 1 and a sliding frame 3. At least two fixing components 6 are installed on one side of the top of the frame 1, and two guide rods 2 are installed on the other side of the top of the frame 1. The sliding frame 3 is slidably mounted on the two guide rods 2. The sliding frame 3 is equipped with at least two fixing components 6, and the frame 1 is equipped with a driving component 4 for driving the sliding frame 3 to reciprocate.

[0039] The fixing component 6 includes an upper clamping plate 61, a lower clamping plate 62, and a locking component 63. Both the upper clamping plate 61 and the lower clamping plate 62 are semi-circular structures. One end of the upper clamping plate 61 and the lower clamping plate 62 are connected by a hinge after mating, and the other end is locked by the locking component 63. The locking component 63 includes a locking bolt and a locking nut. The mating ends of both the upper clamping plate 61 and the lower clamping plate 62 are provided with connecting lugs adapted to the locking bolts.

[0040] The working principle of this invention is: Multiple sets of teeth precisely engage for positioning: A second tooth 53 is provided on the outer side of the end of the pipe body 51, with a first tooth 52 and a third tooth 54 respectively at its two ends; slots 82 for pipe insertion are provided at both ends of the heat fusion sleeve body 81, with a fifth tooth 84 at the slot 82, a sixth tooth inside, and a fourth tooth 83 corresponding to one end of the second tooth 53. During assembly, after the pipe is inserted into the slot 82, the first tooth 52, the second tooth 53, and the third tooth 54 precisely engage with the fourth tooth 83, the fifth tooth 84, and the sixth tooth respectively, restricting the relative displacement between the pipe and the heat fusion sleeve 8 in the radial and axial directions, and preventing welding misalignment.

[0041] The variable diameter section and the inclined part are adapted to fit together: a variable diameter section 55 is provided on the inner wall of one end of the pipe body 51, and an inclined part is provided at the slot 82 of the hot melt sleeve body 81. The two form a "wedge fit", which not only guides the pipe to be quickly inserted into place, but also fills the small gaps, ensuring that the pipe fits tightly with the inner wall of the hot melt sleeve 8, and eliminating the hidden danger of gaps in hot melt welding.

[0042] An electrofusion wire is pre-embedded in the hot melt sleeve body 81. After the pipe and the hot melt sleeve 8 are positioned by interlocking teeth, the electrofusion wire is energized. The heat generated by the electrofusion wire is evenly transferred to the contact surface between the hot melt sleeve body 81 and the pipe body 51, causing the polyethylene material in the contact area to melt and form a molecular layer. After the power is turned off and the material cools down, the molten molecules diffuse and intertwine with each other, solidifying to form a strong welded joint, irreversibly combining the first pipe 5, the second pipe 7 and the hot melt sleeve 8, providing both strength and sealing.

[0043] Pipe alignment adjustment: The device is equipped with a frame 1, a guide rod 2, a sliding frame 3, and a drive component 4. The sliding frame 3 can move back and forth along the guide rod 2. The first pipe 5 and the second pipe 7 are fixed on the frame 1 and the fixing component 6 of the sliding frame 3, respectively. The position of the sliding frame 3 is adjusted by the drive component 4 to precisely control the distance and coaxiality of the two pipes, avoiding uneven welding gaps caused by misalignment.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding joint connection device for hot-melt sleeve of prefabricated direct-buried insulated pipe, characterized in that: The system includes a first pipe (5), a second pipe (7), and a heat-fusion sleeve (8). The first pipe (5) and the second pipe (7) are connected by the heat-fusion sleeve (8). Both the first pipe (5) and the second pipe (7) include a pipe body (51). A second tooth (53) is provided on the outer side of the end of the pipe body (51). A first tooth (52) and a third tooth (54) are provided at both ends of the second tooth (53) on the pipe body (51). The heat-fusion sleeve (8) includes a heat-fusion sleeve body (81). The main body (81) has slots (82) for pipe insertion at both ends. The hot melt sleeve body (81) has a fifth tooth (84) that mates with the second tooth (53) at the slot (82). The hot melt sleeve body (81) has a sixth tooth that mates with the third tooth (54) inside the slot (82). The hot melt sleeve body (81) has a fourth tooth (83) that mates with the second tooth (53) at one end of the second tooth (53). The hot melt sleeve body (81) has a pre-embedded electrothermal fuse.

2. The prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 1, characterized in that: The inner wall of one end of the pipe body (51) is provided with a variable diameter section (55), and the hot melt sleeve body (81) is provided with an inclined part that cooperates with the variable diameter section (55) at the slot (82).

3. The prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 1, characterized in that: It also includes a frame (1) and a sliding frame (3). At least two fixing components (6) are installed on one side of the top of the frame (1), and two guide rods (2) are installed on the other side of the top of the frame (1). The sliding frame (3) is slidably mounted on the two guide rods (2). At least two fixing components (6) are installed on the sliding frame (3). The frame (1) is equipped with a driving component (4) for driving the sliding frame (3) to move back and forth.

4. The prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 3, characterized in that: The fixing component (6) includes an upper clamping plate (61), a lower clamping plate (62), and a locking component (63). The upper clamping plate (61) and the lower clamping plate (62) are both semi-circular structures. One end of the upper clamping plate (61) and the lower clamping plate (62) are connected by a hinge after they are joined together. The other end of the upper clamping plate (61) and the lower clamping plate (62) are locked by the locking component (63).

5. The prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 3, characterized in that: The fixing component (6) includes an upper clamping plate (61), a lower clamping plate (62), and a locking component (63). The upper clamping plate (61) and the lower clamping plate (62) are both semi-circular structures. The two ends of the upper clamping plate (61) and the lower clamping plate (62) after docking are locked by the locking component (63). The upper clamping plate (61) and the lower clamping plate (62) are each equipped with multiple fixing rods (64) at equal intervals. Each fixing rod (64) is equipped with at least one limiting clamping bolt (65).

6. The prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 1, characterized in that: The outer side of the hot melt sleeve body (81) is integrally formed with a polyurethane foam insulation layer. The two ends of the polyurethane foam insulation layer are provided with stepped overlapping surfaces. The outer side of the first tooth (52) of the pipe body (51) is provided with an insulation layer overlapping groove that is compatible with the polyurethane foam insulation layer. The outer side of the polyurethane foam insulation layer is covered with a high-density polyethylene anti-corrosion outer protective layer.

7. A prefabricated direct-buried insulated pipe hot-melt sleeve welding repair connection device according to claim 4 or 5, characterized in that: The locking assembly (63) includes a locking bolt and a locking nut, and the mating ends of the upper clamp (61) and the lower clamp (62) are provided with connecting ears that are compatible with the locking bolt.

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