Electromagnetic hot melt pipe joint and manufacturing method thereof

Abstract

The invention belongs to the technical field of hot melting pipes, and particularly relates to an electromagnetic hot melting pipe joint and a manufacturing method thereof. The pipe joint comprises a pipe joint body which is provided with at least one connecting pipe and is made of a hot melting material, and the connecting pipe is provided with a connecting pipe opening. The embedded hot melting sleeve is placed in a mold in advance in the connecting pipe and pipe joint body injection molding process, in the connecting pipe forming process, the embedded hot melting sleeve is embedded in the inner wall of the adapting pipe opening, the hollow hole is filled with the hole filling body formed by molten materials, the outer end face of the hole filling body is flush with the inner wall of the embedded hot melting sleeve, it is guaranteed that the surface of the inner wall of the adapting pipe opening is smooth, and the service life of the connecting pipe is prolonged. When a pipeline is connected, the connecting pipe is inserted into the adapting pipe opening, the connecting pipe is clamped through heating equipment, alternating current is provided for heating the embedded hot melting sleeve, the internally-inserted connecting pipe and the connecting pipe are combined in a hot melting mode, and it can be guaranteed that when the connecting pipe and the internally-inserted connecting pipe are combined in a hot melting mode through the hollowed-out holes, the hot melting combination position is large in area and wide in range, the hot melting interface is even and stable, and sealing performance is good.

Description

Technical Field

[0001] The invention belongs to the technical field of hot-melt pipes and relates to an electromagnetic hot-melt pipe joint and a manufacturing method thereof. Background Art

[0002] The composite pipe is formed by compounding a metal layer in the middle of a plastic pipe and connected by joints. Since the metal layer in the middle layer of the pipe is airtight and has a good oxygen barrier effect, it can be directly used in direct drinking water projects, and its inner and outer layers are made of plastic material and have very good corrosion resistance. Therefore, the composite pipe has a wide range of uses and can be used in various fields such as oil and natural gas transportation, industrial and mining pipes, drinking water pipes, drainage pipes, etc. At present, the connection between the joint and the composite pipe of the composite pipe generally utilizes the metal properties of the metal layer through electromagnetic welding. When the existing electromagnetic hot-melt pipe welding structure welds the inner pipe, the area and range of the hot-melt joint are small, the uniformity and stability of the hot-melt interface are poor, and uneven height differences are prone to occur, affecting the sealing. Therefore, it is urgent to design an electromagnetic hot-melt pipe joint and a manufacturing method thereof that can overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a steel-plastic pipe electromagnetic induction double heat welding method [application number: 202111087958.5], which uses a steel-plastic composite pipe intelligent welding device for welding. The steel-plastic composite pipe intelligent welding device includes a main unit and a clamp, and specifically includes the following steps: Step 1, turn on the machine, connect the clamp and the main unit, and turn on the main unit; Step 2, installation, place the two steel-plastic composite pipes to be heat-welded on the clamp after socket connection, and clamp the steel-plastic pipe to be heat-welded. The part to be heat-welded is clamped by the clamp; Step 3, hot welding, hold the clamp, run the program on the main unit, perform intelligent hot welding on the steel-plastic pipe, and the clamp automatically cuts off the power after the hot welding is completed; Step 4: Cooling, keep the steel-plastic composite pipe still after the hot welding is completed, and remove the steel-plastic composite pipe from the clamp after the steel-plastic composite pipe is cooled. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic hot-melt pipe joint and a manufacturing method thereof in view of the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electromagnetic hot-melt pipe joint comprises a pipe joint body having at least one connecting pipe and made of hot-melt material, the connecting pipe having a receiving pipe port, an embedded hot-melt sleeve made of electromagnetic induction heating material being embedded in the inner wall of the receiving pipe port, a plurality of hollow holes penetrating the inner and outer walls of the embedded hot-melt sleeve being distributed on the embedded hot-melt sleeve, a hole-filling body integrally made with the connecting pipe being passed through the hollow holes, and an outer end surface of the hole-filling body being flush with the inner wall of the embedded hot-melt sleeve.

[0007] In the above-mentioned electromagnetic hot-melt pipe joint, the embedded hot-melt sleeve is made of sheet-like profiles bent and spliced ​​together, the punching inlet of the hollow hole is located on the inner wall side of the embedded hot-melt sleeve, and the punching outlet of the hollow hole is located on the outer wall side of the embedded hot-melt sleeve.

[0008] In the above electromagnetic hot-melt pipe joint, a rough burr structure is formed between the punching outlet of the hollow hole and the outer wall of the embedded hot-melt sleeve, and a bonding gap is formed between the rough burr structure and the outer wall of the embedded hot-melt sleeve.

[0009] In the above electromagnetic hot-melt pipe joint, the shape of the hollow hole is a combination of one or more of a honeycomb shape, an ellipse, a rectangle, a triangle, and a polygon.

[0010] In the above-mentioned electromagnetic hot-melt pipe joint, the ratio of the total area of ​​the solid filling area of ​​the embedded hot-melt sleeve to the total area of ​​the hollow holes is in the range of 1:2-1:3.

[0011] In the above-mentioned electromagnetic hot-melt pipe joint, the embedded hot-melt sleeve is bent and enclosed to form a splicing joint surface, the inner wall of the splicing joint surface is smoothly abutted, the outer wall of the splicing joint surface of the embedded hot-melt sleeve is connected by welding, and the smoothness of the inner wall surface of the embedded hot-melt sleeve is higher than the smoothness of the outer wall surface of the embedded hot-melt sleeve.

[0012] In the above-mentioned electromagnetic hot-melt pipe joint, a joint gap is formed between the outer wall welding part of the splicing joint surface of the embedded hot-melt sleeve and the outer part of the embedded hot-melt sleeve.

[0013] In the above electromagnetic hot-melt pipe joint, the pipe connection has a hot-melt sleeve step abutting against the embedded hot-melt sleeve, and the pipe joint body has at least one pipe mouth inner ring body, and a hot-melt interface is formed between the pipe mouth inner ring body and the hot-melt sleeve step.

[0014] A method for manufacturing an electromagnetic hot-melt pipe joint according to any one of claims 1 to 5, the method comprising the following steps:

[0015] S1: Heating, selecting a thermoplastic material, heating the material to a liquid state, and melting it;

[0016] S2: Assembly, providing the processed and formed embedded hot melt sleeve, inserting the embedded hot melt sleeve into the pipe mold, and making the inner wall of the embedded hot melt sleeve close to the core-pulling structure of the pipe mold;

[0017] S3: Injection molding: injecting the molten material into the pipe mold after mold closing for injection molding;

[0018] S4: Cooling and demoulding. After the injection molded plastic part is cooled and solidified, the core is pulled out and demoulding is performed to take out the molded plastic part.

[0019] In the manufacturing method of the electromagnetic hot-melt pipe joint described above, in step S, before assembling the embedded hot-melt sleeve, a sheet-shaped profile made of an electromagnetic induction heating material is selected. The profile is punched by a punching device to form a hollow hole, the protrusion at the punching outlet of the hollow hole is polished, and one side of the punching inlet of the hollow hole is polished by a polishing device. After the sheet-shaped profile is pre-bent, the polished side of the sheet-shaped profile contacts the upper roller of the plate rolling machine, and the punched and polished sheet-shaped profile is bent and enclosed by the plate rolling machine. The splicing joint surface of the sheet-shaped profile is welded by a welding machine with a straight seam.

[0020] Compared with the existing technology, the advantages of the present invention are as follows:

[0021] 1. In the present invention, the embedded hot-melt sleeve is pre-placed in the mold during the injection molding process of the connecting pipe and the pipe joint body. During the forming process of the connecting pipe, the embedded hot-melt sleeve is embedded in the inner wall of the receiving pipe orifice. The molten material forms a filling body that fills the hollow hole, and the outer end surface of the filling body is flush with the inner wall of the embedded hot-melt sleeve, ensuring that the inner wall surface of the receiving pipe orifice is smooth. When connecting the pipeline, the connecting pipe is inserted into the receiving pipe orifice, the connecting pipe is clamped by a heating device, and an alternating current is provided to heat the embedded hot-melt sleeve, so that the inserted connecting pipe and the connecting pipe are hot-melt combined. Through the hollow hole, it can be ensured that when the connecting pipe and the inserted connecting pipe are hot-melt combined, the hot-melt combined area is large, the range is wide, the hot-melt interface is uniform and stable, and the sealing performance is good.

[0022] 2. A rough burr structure is formed between the punching outlet of the hollow hole and the outer wall surface of the embedded hot-melt sleeve in the present invention. During injection molding, it can better contact the molten material tightly. A bonding gap is formed between the rough burr structure and the outer wall surface of the embedded hot-melt sleeve. When the inner inserted pipe and the connecting pipe are hot-melt connected, the biting area between the outer wall of the embedded hot-melt sleeve and the inner wall of the receiving pipe orifice can be increased, ensuring that the embedded hot-melt sleeve will not separate from the connecting pipe, and improving the stability and accuracy of the hot-melt connection.

[0023] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention.

[0025] Figure 2 is a schematic structural diagram of the present invention in another direction.

[0026] Figure 3 is a schematic structural diagram of the embedded hot-melt sleeve.

[0027] In the figure: adapter 1, pipe joint body 2, receiving pipe orifice 3, embedded hot melt sleeve 4, hollow hole 5, hole filling body 6, hot melt sleeve step 7, inner ring body of the pipe orifice 8, hot melt joint 9. Specific embodiments

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] As Figures 1-3 shown, an electromagnetic hot melt pipe joint includes a pipe joint body 2 having at least one adapter 1 and made of a hot melt material. The adapter 1 has a receiving pipe orifice 3. An embedded hot melt sleeve 4 made of an electromagnetic induction heating material is embedded in the inner wall of the receiving pipe orifice 3. A number of hollow holes 5 penetrating the inner and outer walls of the embedded hot melt sleeve 4 are distributed on the embedded hot melt sleeve 4. A hole filling body 6 integrally formed with the adapter 1 is inserted into the hollow holes 5, and the outer end surface of the hole filling body 6 is flush with the inner wall of the embedded hot melt sleeve 4.

[0030] In this embodiment, the embedded hot melt sleeve 4 is pre-placed in the mold during the injection molding process of the adapter 1 and the pipe joint body 2. During the molding process of the adapter 1, the embedded hot melt sleeve 4 is embedded in the inner wall of the receiving pipe orifice 3, and the molten material forms a hole filling body 6 to fill the hollow holes 5. The outer end surface of the hole filling body 6 is flush with the inner wall of the embedded hot melt sleeve 4, ensuring that the inner wall surface of the receiving pipe orifice 3 is smooth. When connecting the pipeline, the connecting pipe is inserted into the receiving pipe orifice 3, and the adapter 1 is clamped by a heating device to provide alternating current to heat the embedded hot melt sleeve 4, so that the inserted connecting pipe and the adapter 1 are hot melt combined. Through the hollow holes 5, it can be ensured that when the adapter 1 and the inserted connecting pipe are hot melt combined, the hot melt combined area is large, the range is wide, the hot melt interface is uniform and stable, and the sealing performance is good.

[0031] The hollow holes 5 are composed of a number of side hollow holes, middle hollow holes, middle-side hollow holes, and side hollow fine holes. The middle hollow holes and the middle-side hollow holes are located between two adjacent rows of side hollow holes. The side hollow fine holes are arranged staggered with the side hollow holes. The aperture of the side hollow fine holes is smaller than that of the middle-side hollow holes, the aperture of the middle-side hollow holes is smaller than that of the middle hollow holes, the aperture of the middle hollow holes is smaller than that of the side hollow holes, and a uniform distribution layout is adopted to ensure the hot melt area and reduce the hot melt dead angle.

[0032] Combined Figures 1-3 shown, the embedded hot melt sleeve 4 is made by bending and enclosing and splicing a sheet-shaped profile. The punching inlet of the hollow hole 5 is located on the inner wall side of the embedded hot melt sleeve 4, and the punching outlet of the hollow hole 5 is located on the outer wall side of the embedded hot melt sleeve 4.

[0033] Specifically, the embedded hot-melt sleeve 4 is made of sheet profiles that are bent and spliced ​​together. The required sheet profiles can be selected according to the different specifications of the connecting pipes 1, so that the embedded hot-melt sleeve 4 is close to the core-pulling structure of the mold. The punching entrance of the hollow hole 5 is located on the inner wall side of the embedded hot-melt sleeve 4, and the punching outlet of the hollow hole 5 is located on the outer wall side of the embedded hot-melt sleeve 4. The burr surface generated by the punching outlet of the hollow hole 5 is located on the outer wall side of the embedded hot-melt sleeve 4, which can better contact with the molten material during injection molding.

[0034] Combination Figure 1 , Figure 3 As shown, a rough burr structure is formed between the punching outlet of the hollow hole 5 and the outer wall surface of the embedded hot melt sleeve 4, and a bonding gap is formed between the rough burr structure and the outer wall surface of the embedded hot melt sleeve 4.

[0035] In this embodiment, a rough burr structure is formed between the punching outlet of the hollow hole 5 and the outer wall surface of the embedded hot-melt sleeve 4, which can better contact with the molten material during injection molding, and a bonding gap is formed between the rough burr structure and the outer wall surface of the embedded hot-melt sleeve 4. When the inner tube is hot-melt connected to the connecting pipe 1, the bite area between the outer wall of the embedded hot-melt sleeve 4 and the inner wall of the receiving pipe port 3 can be increased, ensuring that the embedded hot-melt sleeve 4 will not be separated from the connecting pipe 1, thereby improving the stability and accuracy of the hot-melt connection.

[0036] The hollow holes 5 are in the shape of a honeycomb, an ellipse, a rectangle, a triangle, a polygon or a combination of one or more thereof.

[0037] In this embodiment, the shape of the hollow hole 5 is a combination of one or more of a honeycomb shape, an ellipse, a rectangle, a triangle, and a polygon, which serves to ensure the hot-melt area and reduce the hot-melt dead angle.

[0038] Combination Figure 3 As shown, the ratio of the total area of ​​the solid filling area of ​​the embedded hot melt sleeve 4 to the total area of ​​the hollow holes 5 is between 1:2 and 1:3.

[0039] In this embodiment, the ratio of the total area of ​​the solid filling area of ​​the embedded hot melt sleeve 4 to the total area of ​​the hollow hole 5 is between 1:2-1:3, and the total area of ​​the hollow part is larger than the total area of ​​the solid filling area of ​​the embedded hot melt sleeve 4, so as to ensure the amount of hot melt connection molten material and the hot melt connection is stable.

[0040] The embedded hot melt sleeve 4 is bent and surrounded to form a splicing joint surface, the outer wall of the splicing joint surface of the embedded hot melt sleeve 4 is connected by welding, the inner wall of the splicing joint surface is smoothly abutted, and a joint gap is formed between the outer wall welding of the splicing joint surface of the embedded hot melt sleeve 4 and the outer side of the embedded hot melt sleeve 4.

[0041] In this embodiment, a bonding gap is formed between the outer wall welding part of the splicing joint surface of the embedded hot-melt sleeve 4 and the outer wall surface of the embedded hot-melt sleeve 4. When injection molding, the molten material fills the voids of the splicing joint surface of the embedded hot-melt sleeve 4. At the same time, the biting area between the outer wall of the embedded hot-melt sleeve 4 and the inner wall of the receiving pipe orifice 3 can be further increased. The height difference generated can fill more molten material, ensuring that the embedded hot-melt sleeve 4 will not separate from the connecting pipe 1, and improving the stability and accuracy of the hot-melt connection.

[0042] The smoothness of the inner wall surface of the described embedded hot-melt sleeve 4 is higher than that of the outer wall surface of the embedded hot-melt sleeve 4.

[0043] In this embodiment, the smoothness of the inner wall surface of the embedded hot-melt sleeve 4 is higher than that of the outer wall surface of the embedded hot-melt sleeve 4. The inner wall surface of the embedded hot-melt sleeve 4 is polished, and its smoothness is higher than that of the outer wall surface of the embedded hot-melt sleeve 4. During the injection molding demolding process, the embedded hot-melt sleeve 4 can be better separated from the mold core-pulling structure, and there will be no demolding jamming.

[0044] Combined Figure 2 As shown, there is a hot-melt sleeve step 7 in the connecting pipe 1 that abuts against the embedded hot-melt sleeve 4. There is at least one orifice inner ring body 8 in the pipe joint body 2. A hot-melt interface 9 is formed between the orifice inner ring body 8 and the hot-melt sleeve step 7.

[0045] In this embodiment, the hot-melt sleeve step 7 can abut against the inner side of the embedded hot-melt sleeve 4 after injection molding and cooling, avoiding the inward sliding of the embedded hot-melt sleeve 4 during hot-melt connection. The structure is compact and reasonable. During hot-melting, the inner inserted pipe abuts against the hot-melt interface 9, performing abutting positioning on the inner inserted pipe with precise positioning.

[0046] A manufacturing method of an electromagnetic hot-melt pipe joint according to any one of claims 1-8, this method includes the following steps:

[0047] S1: Heating, select a thermoplastic material, heat the material to a liquid state for melting;

[0048] S2: Assembly, provide a processed and formed embedded hot-melt sleeve 4, insert the embedded hot-melt sleeve 4 into the pipe mold, and make the inner wall of the embedded hot-melt sleeve 4 closely adhere to the core-pulling structure of the pipe mold;

[0049] S3: Injection molding and shaping, inject the melted material into the closed pipe mold for injection molding;

[0050] S4: Cooling and demolding, cool and solidify the injection-molded plastic part, then perform core-pulling demolding, and take out the formed plastic part.

[0051] In this embodiment, in S2, the embedded hot-melt sleeve 4 is inserted into the pipe mold, the release agent is evenly applied to the inner wall of the embedded hot-melt sleeve 4 and the core-pulling structure of the pipe mold, and the inner wall of the embedded hot-melt sleeve 4 is closely attached to the core-pulling structure of the pipe mold.

[0052] Combined Figure 2 As shown, in S2, before assembling the embedded hot-melt sleeve 4, a sheet-shaped profile made of an electromagnetic induction heating material is selected, the profile is punched by a punching device to form a hollow hole 5, the protrusion at the punching outlet of the hollow hole 5 is polished, and one side of the punching inlet of the hollow hole 5 is polished by a polishing device. After the sheet-shaped profile is pre-bent, the polished side of the sheet-shaped profile contacts the upper roller of the plate rolling machine, and the punched and polished sheet-shaped profile is bent and surrounded by the plate rolling machine. The splicing joint surface of the sheet-shaped profile is butt-welded by a welding machine.

[0053] In this embodiment, the plate rolling machine can be a three-roll plate rolling machine or a four-roll plate rolling machine. The polished side of the sheet-shaped profile contacts the upper roller of the plate rolling machine to ensure that the rough burr structure of the embedded hot-melt sleeve 4 is located on the outer wall surface of the embedded hot-melt sleeve 4. The splicing joint surface of the sheet-shaped profile is butt-welded by a welding machine, and a joint gap is formed on the outer wall of the splicing joint surface. When injecting plastic, the molten material fills the gap of the splicing joint surface of the embedded hot-melt sleeve 4. At the same time, the biting area between the outer wall of the embedded hot-melt sleeve 4 and the inner wall of the receiving pipe orifice 3 can be further increased, and the height difference generated can fill more molten material, ensuring that the embedded hot-melt sleeve 4 will not be separated from the connecting pipe 1, and improving the stability and accuracy of the hot-melt connection.

[0054] The working principle of the present invention is:

[0055] The embedded hot-melt sleeve 4 is pre-placed in the mold during the injection molding process of the connecting pipe 1 and the pipe joint body 2. During the forming process of the connecting pipe 1, the embedded hot-melt sleeve 4 is embedded in the inner wall of the receiving pipe orifice 3, and the molten material forms a filling body 6 to fill the hollow hole 5. The outer end surface of the filling body 6 is flush with the inner wall of the embedded hot-melt sleeve 4 to ensure that the inner wall surface of the receiving pipe orifice 3 is smooth. When connecting the pipeline, the connecting pipe is inserted into the receiving pipe orifice 3, the connecting pipe 1 is clamped by a heating device, and an alternating current is provided to heat the embedded hot-melt sleeve 4, so that the inserted connecting pipe and the connecting pipe 1 are hot-melt combined. Through the hollow hole 5, it can be ensured that when the connecting pipe 1 and the inserted connecting pipe are hot-melt combined, the hot-melt combined area is large, the range is wide, the hot-melt interface is uniform and stable, and the sealing performance is good;

[0056] The hollow holes 5 are composed of a plurality of side hollow holes, a middle hollow hole, a middle side hollow hole, and a side hollow fine hole. The middle hollow hole and the middle side hollow hole are located between two adjacent rows of side hollow holes. The side hollow fine holes are arranged alternately with the side hollow holes. The aperture of the side hollow fine hole is smaller than the aperture of the middle side hollow hole. The aperture of the middle side hollow hole is smaller than the aperture of the middle hollow hole. The aperture of the middle hollow hole is smaller than the aperture of the side hollow hole. A uniformly distributed layout is adopted to ensure the hot melt area and reduce the hot melt dead angle.

[0057] The embedded hot-melt sleeve 4 is made of sheet-shaped profiles bent and spliced ​​together. The required sheet-shaped profiles can be selected according to the different specifications of the pipe 1, so that the embedded hot-melt sleeve 4 and the core-pulling structure of the mold can be closely attached. The punching entrance of the hollow hole 5 is located on the inner wall side of the embedded hot-melt sleeve 4, and the punching outlet of the hollow hole 5 is located on the outer wall side of the embedded hot-melt sleeve 4. The burr surface generated by the punching outlet of the hollow hole 5 is located on the outer wall side of the embedded hot-melt sleeve 4, which can better contact closely with the molten material during injection molding.

[0058] A rough burr structure is formed between the punching outlet of the hollow hole 5 and the outer wall of the embedded hot-melt sleeve 4, which can better contact with the molten material during injection molding. A bonding gap is formed between the rough burr structure and the outer wall of the embedded hot-melt sleeve 4. When the inner insert pipe is hot-melted to the connecting pipe 1, the bite area between the outer wall of the embedded hot-melt sleeve 4 and the inner wall of the receiving pipe port 3 can be increased to ensure that the embedded hot-melt sleeve 4 will not be separated from the connecting pipe 1, thereby improving the stability and accuracy of the hot-melt connection.

[0059] The shape of the hollow hole 5 is a combination of one or more of honeycomb, ellipse, rectangle, triangle, polygon, etc., which ensures the hot melt area and reduces the hot melt dead corner. The ratio of the total area of ​​the solid filling area of ​​the embedded hot melt sleeve 4 to the total area of ​​the hollow hole 5 is between 1:2-1:3, and the total area of ​​the hollow part is larger than the total area of ​​the solid filling area of ​​the embedded hot melt sleeve 4, so as to ensure the amount of hot melt connection molten material, and the hot melt connection is stable.

[0060] A bonding gap is formed between the outer wall welding part of the splicing joint surface of the embedded hot melt sleeve 4 and the outer wall surface of the embedded hot melt sleeve 4. During injection molding, the molten material fills the gap of the splicing joint surface of the embedded hot melt sleeve 4, and at the same time, the bite area between the outer wall of the embedded hot melt sleeve 4 and the inner wall of the receiving pipe port 3 can be further increased. The height difference generated can be filled with more molten material, ensuring that the embedded hot melt sleeve 4 will not be separated from the receiving pipe 1, thereby improving the stability and accuracy of the hot melt connection.

[0061] The smoothness of the inner wall surface of the embedded hot melt sleeve 4 is higher than that of the outer wall surface of the embedded hot melt sleeve 4. The inner wall surface of the embedded hot melt sleeve 4 is polished, and the smoothness is higher than that of the outer wall surface of the embedded hot melt sleeve 4. In the process of injection molding and demolding, the embedded hot melt sleeve 4 can be better separated from the core pulling structure of the mold, and there will be no demolding jam.

[0062] The hot-melt sleeve step 7 can be abutted against the inner side of the embedded hot-melt sleeve 4 after the injection molding and cooling, avoiding the inward sliding of the embedded hot-melt sleeve 4 during the hot-melt connection. The structure is compact and reasonable. During the hot-melting, the inner inserting pipe is abutted against the hot-melt interface 9 for abutting and positioning the inner inserting pipe, and the positioning is accurate.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute them, but will not deviate from the spirit of the present invention.

[0064] Although terms such as the connecting pipe 1, the pipe joint body 2, the receiving pipe orifice 3, the embedded hot-melt sleeve 4, the hollow hole 5, the hole filling body 6, the hot-melt sleeve step 7, the inner ring body of the pipe orifice 8, and the hot-melt interface 9 are used more frequently herein, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. An electromagnetic hot-melt pipe joint, comprising a pipe joint body (2) having at least one pipe joint (1) and made of hot-melt material, wherein the pipe joint (1) has a receiving pipe opening (3), and an embedded hot-melt sleeve (4) made of electromagnetic induction heating material is embedded in the inner wall of the receiving pipe opening (3). It is characterized in that The embedded hot melt sleeve (4) is provided with a plurality of hollow holes (5) penetrating the inner and outer walls of the embedded hot melt sleeve (4), and a hole-filling body (6) integrally made with the connecting pipe (1) is passed through the hollow holes (5), and the outer end surface of the hole-filling body (6) is flush with the inner wall of the embedded hot melt sleeve (4).

2. The electromagnetic hot-melt pipe joint according to claim 1, It is characterized in that The embedded hot melt sleeve (4) is made of sheet-like profiles that are bent, enclosed and spliced ​​together. The punching entrance of the hollow hole (5) is located on the inner wall side of the embedded hot melt sleeve (4), and the punching exit of the hollow hole (5) is located on the outer wall side of the embedded hot melt sleeve (4).

3. The electromagnetic hot-melt pipe joint according to claim 2, It is characterized in that A rough burr structure is formed between the punching outlet of the hollow hole (5) and the outer wall surface of the embedded hot melt sleeve (4), and a bonding gap is formed between the rough burr structure and the outer wall surface of the embedded hot melt sleeve (4).

4. The electromagnetic hot-melt pipe joint according to claim 3, It is characterized in that The hollow hole (5) is in the shape of a honeycomb, an ellipse, a rectangle, a triangle, a polygon, or a combination of one or more thereof.

5. The electromagnetic hot-melt pipe joint according to any one of claims 1 to 4, It is characterized in that The ratio of the total area of ​​the solid filling area of ​​the embedded hot melt sleeve (4) to the total area of ​​the hollow holes (5) is between 1:2 and 1:

3.

6. The electromagnetic hot-melt pipe joint according to any one of claims 1 to 4, It is characterized in that The embedded hot melt sleeve (4) is bent and enclosed to form a splicing joint surface, the inner wall of the splicing joint surface is smoothly abutted, the outer wall of the splicing joint surface of the embedded hot melt sleeve (4) is connected by welding, and the smoothness of the inner wall surface of the embedded hot melt sleeve (4) is higher than the smoothness of the outer wall surface of the embedded hot melt sleeve (4).

7. The electromagnetic hot-melt pipe joint according to claim 6, It is characterized in that A joining gap is avoided between the outer wall welding part of the splicing joint surface of the embedded hot melt sleeve (4) and the outside of the embedded hot melt sleeve (4).

8. The electromagnetic hot-melt pipe joint according to claim 1, It is characterized in that The connecting pipe (1) has a hot melt sleeve step (7) abutting against the embedded hot melt sleeve (4), and the pipe joint body (2) has at least one pipe mouth inner ring body (8), and a hot melt interface (9) is formed between the pipe mouth inner ring body (8) and the hot melt sleeve step (7).

9. A method for manufacturing an electromagnetic hot-melt pipe joint according to any one of claims 1 to 8, It is characterized in that The method comprises the following steps: S1: Heating, selecting a thermoplastic material, heating the material to a liquid state, and melting it; S2: Assembly. Provide a processed and formed embedded hot-melt sleeve (4), insert the embedded hot-melt sleeve (4) into the pipe mold, and make the inner wall of the embedded hot-melt sleeve (4) closely adhere to the core-pulling structure of the pipe mold; S3: Injection molding. Inject the melted material into the closed pipe mold for injection molding; S4: Cooling and demolding. Cool and solidify the plastic part after injection molding, then perform core-pulling demolding to take out the formed plastic part.

10. The manufacturing method of the electromagnetic hot-melt pipe joint according to claim 9, characterized in that in S2, before assembling the embedded hot-melt sleeve (4), select a sheet-shaped profile made of electromagnetic induction heating material, punch the profile with a punching device to form a hollow hole (5), polish the protrusion at the punching outlet of the hollow hole (5), polish one side of the punching inlet of the hollow hole (5) with a polishing device, after pre-bending the sheet-shaped profile, make the polished side of the sheet-shaped profile contact with the upper roller of the plate rolling machine, bend and enclose the punched and polished sheet-shaped profile by the plate rolling machine, and perform straight-seam welding on the splicing joint surface of the sheet-shaped profile by a welding machine.

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