Steel-plastic composite pipe hot melting flanging sealing device and sealing method

Abstract

The invention discloses a steel-plastic composite pipe hot melting flanging sealing device and a sealing method, and relates to the technical field of steel-plastic composite pipe machining technology.The steel-plastic composite pipe hot melting flanging sealing device comprises a base and a heating plate fixedly arranged on the base, and a flanging heating mold is fixedly arranged on the heating plate; the flanging heating die is provided with an annular sealing groove matched with the steel-plastic composite pipe, and the groove face of the annular sealing groove is in an arc shape. The problem that the steel belt on the end face of the steel-plastic composite pipe is exposed can be effectively solved, and the overall sealing performance and durability of the steel-plastic composite pipe are improved.

Description

Technical Field

[0001] The present application relates to the technical field of steel-plastic composite pipe processing technology, and in particular to a steel-plastic composite pipe hot-melt flanging sealing device and a sealing method. Background Art

[0002] Steel-plastic composite pipe is a composite pipe with steel pipe as the skeleton and thermoplastic plastic (such as polyethylene) as the external composite pipe. This pipe combines the high strength of metal pipes and the corrosion resistance of plastic pipes, so it is widely used in many fields such as water supply, gas, mining, chemical industry, agricultural irrigation and chemical water transportation. Due to its good comprehensive performance, steel-plastic composite pipe can not only be laid directly buried, but also suitable for overhead laying, which effectively improves the safety and reliability of the project.

[0003] At present, in order to ensure the end sealing performance of steel-plastic composite pipes, existing technologies usually adopt various means to prevent the debonding between the steel belt and the plastic. For example, some methods are to apply adhesive on the end face of the steel-plastic composite pipe, or to cover the end face with a heat shrink sleeve, and some methods are to add an additional plastic layer or metal ring at the end face to enhance the sealing of the end face. Although these methods can solve the problem to a certain extent, they still have some shortcomings in practical applications.

[0004] Specifically, the adhesive coating method may result in poor long-term reliability and durability due to the unstable performance of the adhesive; the heat shrink tubing method may cause local poor sealing due to uneven heat shrinkage; in addition, adding additional plastic layers or metal rings will also increase production costs and operational complexity, and may not achieve the ideal sealing effect in certain special environments. These problems limit the application scope of steel-plastic composite pipes in certain key areas. Summary of the invention

[0005] In view of the problems existing in the prior art, the present application provides a hot-melt flanging sealing device and a sealing method for a steel-plastic composite pipe.

[0006] In the first aspect, the present application provides a hot-melt flanging sealing device for a steel-plastic composite pipe, which adopts the following technical solution: A hot-melt flanging sealing device for a steel-plastic composite pipe comprises a base and a heating plate fixedly arranged on the base, a flanging heating mold fixedly arranged on the heating plate, an annular sealing groove adapted to the steel-plastic composite pipe is arranged on the flanging heating mold, and the groove surface of the annular sealing groove is arc-shaped.

[0007] Optionally, the flanged heating mold includes a substrate fixed on the heating plate and a heat-conducting ring embedded in the substrate, the substrate is made of heat-insulating material, the annular sealing groove is opened on the heat-conducting ring along the circumference of the heat-conducting ring, and the heat-conducting ring abuts against the end face of the heating plate.

[0008] Optionally, a heat exchange tube is inserted into the substrate, the heat exchange tube is in contact with the heat conductive ring, and the heat exchange tube is connected to a water inlet pipe and a water outlet pipe.

[0009] Optionally, the flanging heating mold is detachably arranged on the heating plate.

[0010] Optionally, a mounting hole is provided on the base plate, a bolt is passed through the mounting hole, a clamp is threadedly connected to the bolt, the base plate and the clamp are respectively arranged at two ends of the heating plate, and a through hole for the bolt to pass through is provided on the heating plate.

[0011] Optionally, a positioning block is fixedly provided on the substrate, the positioning block is adapted to the through hole, and the mounting hole passes through the positioning block, and the substrate and the heating plate are spaced apart.

[0012] Optionally, a positioning frame is provided on the base for sliding in a direction approaching or moving away from the flanging heating mold, a driving member for driving the positioning frame to slide is provided on the base, and a fixing component for fixing the steel-plastic composite pipe is provided on the positioning frame.

[0013] Optionally, a sliding plate is provided on the base for sliding in a direction close to or away from the flanging heating mold, the driving member is used to drive the sliding plate to slide, the positioning frame is slidably provided on the sliding plate, and an elastic member is provided on the sliding plate for driving the positioning frame to slide in a direction close to the flanging heating mold.

[0014] Optionally, the fixing assembly includes a first clamping frame, a second clamping frame and a bidirectional cylinder, the bidirectional cylinder is fixedly arranged on a positioning frame, the first clamping frame and the second clamping frame are respectively fixedly arranged on two piston rods of the bidirectional cylinder, and a clamping interval for clamping the steel-plastic composite pipe is formed between the first clamping frame and the second clamping frame.

[0015] In a second aspect, the present application provides a sealing method for a hot-melt flanging sealing device for a steel-plastic composite pipe, which adopts the following technical solution: A sealing method for a steel-plastic composite pipe hot-melt flanging sealing device comprises the following steps: S1. Open an arc-shaped notch on the sealing end face of the steel-plastic composite pipe, and expose the steel belt inside the steel-plastic composite pipe; S2, placing the sealed end face of the steel-plastic composite pipe into the annular sealing groove of the flanging heating mold; S3. The flanging heating mold is heated by a heating plate. At the same time, a certain pressure is applied to the steel-plastic composite pipe so that the steel-plastic composite pipe is pressed against the flanging heating mold. During this process, the plastic at the sealing end face of the steel-plastic composite pipe is hot-melted and squeezed and deformed toward the middle along the groove face of the annular sealing groove, thereby wrapping the exposed steel strip.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The hot-melt flanging sealing device for steel-plastic composite pipes of the present application can effectively solve the problem of exposed steel strips at the end faces of steel-plastic composite pipes. Specifically, by arranging a flanging heating mold with an annular sealing groove on the heating plate, the end face of the steel-plastic composite pipe can be tightly fitted in the annular sealing groove. When heated, the plastic at the end face of the steel-plastic composite pipe is melted by the heat and squeezed toward the middle along the arc groove surface of the annular sealing groove, thereby completely covering and sealing the exposed steel strips, thereby improving the overall sealing and durability of the steel-plastic composite pipe.

[0017] 2. The present application comprises a flanged heating mold consisting of a substrate and a heat-conducting ring. The substrate is made of heat-insulating material, which can effectively reduce heat transfer to the outside of the substrate, avoid burns to operators, and improve energy utilization efficiency.

[0018] 3. The present application arranges a heat exchange tube in the substrate. When the end face of the steel-plastic composite tube is sealed by hot melt, a coolant is introduced into the heat exchange tube through a water inlet pipe. The coolant quickly cools the heat-conducting ring, so that the plastic on the end face of the steel-plastic composite tube is quickly cooled and solidified, thereby ensuring the sealing quality of the end face of the steel-plastic composite tube.

[0019] 4. The present application makes the flanging heating mold detachable on the heating plate so that the flanging heating mold can be easily and quickly replaced when damaged, thereby improving the convenience of equipment maintenance; at the same time, it can be adapted to the installation of flanging heating molds of different specifications to accommodate the sealing processing of steel-plastic composite pipes of different sizes, thereby improving the flexibility of use.

[0020] 5. The present application can realize precise positioning and stable fixation of the steel-plastic composite pipe through the design of the positioning frame, ensure the position accuracy and stability during the sealing process, and effectively avoid the problem of poor sealing caused by position deviation.

[0021] 6. This application slides a sliding plate on the base and slides a positioning frame on the sliding plate. When the steel-plastic composite pipe is sealed, the steel-plastic composite pipe is always pressed against the flanging heating mold by the elastic member, so that the plastic at the sealing end face of the steel-plastic composite pipe can be squeezed and deformed toward the middle along the groove surface of the annular sealing groove after being hot-melted, thereby wrapping the exposed steel strip. Automated sealing operation is achieved, production efficiency and automation are improved, and the consistency and reliability of sealing quality are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a structural cross-sectional view of an embodiment of the present application; Figure 3It is a cross-sectional view of the structure of the flanging heating mold used to express the embodiment of the present application; Figure 4 It is a schematic diagram of the structure of the sliding plate used to express the embodiment of the present application.

[0023] Explanation of the accompanying drawings: 1. base; 11. bracket; 12. shell; 13. guide rail; 14. driving member; 2. heating plate; 21. through hole; 3. flanging heating mold; 31. annular sealing groove; 32. base plate; 321. mounting hole; 322. bolt; 323. positioning block; 324. heat exchange tube; 325. water inlet pipe; 326. water outlet pipe; 33. heat conductive ring; 34. splint; 4. sliding plate; 41. elastic member; 5. positioning frame; 51. guide rod; 511. end plate; 52. first clamping frame; 53. second clamping frame; 54. two-way cylinder; 55. rubber pad. DETAILED DESCRIPTION

[0024] The following will be combined with the attached Figure 1 -Attached Figure 4 , the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0025] The inventor of the present application has found that the steel strip at the end face of the existing steel-plastic composite pipe is exposed, which makes it easy for the steel strip to come apart from the plastic. To this end, the present application discloses a hot-melt flanging sealing device and sealing method for a steel-plastic composite pipe, which mainly adopts the following scheme: The present application embodiment discloses a hot-melt flanging sealing device for a steel-plastic composite pipe. Figure 1 , 2 , including a base 1, a bracket 11 is fixedly arranged on the base 1, a shell 12 is fixedly arranged on the bracket 11, a heating plate 2 is fixedly arranged in the shell 12, a flanging heating mold 3 is fixedly arranged on the heating plate 2, and an annular sealing groove 31 adapted to the steel-plastic composite pipe is arranged on the flanging heating mold 3.

[0026] Reference Figure 1 , 2 The base 1, as the basic support part of the whole device, can be made of cast iron or steel plate material to ensure sufficient strength and stability. The heating plate 2 is mainly used to provide heat to increase its surface temperature, thereby heating the flanging heating mold 3. The heating plate 2 can be an electric heating plate 2, which generates heat through a resistance wire, or an electromagnetic induction heating plate 2, which generates heat using the electromagnetic induction effect. Both heating methods can effectively improve the heating efficiency and temperature control accuracy.

[0027] Reference Figure 2 The flanging heating mold 3 includes a substrate 32 and a heat-conducting ring 33. The substrate 32 is made of heat-insulating materials, such as ceramic fiberboard or asbestos board, to reduce heat loss and improve energy utilization. The heat-conducting ring 33 is embedded in the substrate 32. The material can be copper or aluminum. These two materials have good thermal conductivity and can quickly transfer heat to the annular sealing groove 31. The annular sealing groove 31 is opened on the heat-conducting ring 33 along the circumference of the heat-conducting ring 33, and the end face of the heat-conducting ring 33 away from the annular sealing groove 31 abuts against the end face of the heating plate 2, so as to ensure that the heat of the heating plate 2 can be efficiently transferred to the heat-conducting ring 33.

[0028] Reference Figure 2 In the embodiment of the present application, the groove surface of the annular sealing groove 31 is set in an arc shape, which helps the plastic on the end face of the steel-plastic composite pipe to flow better and wrap the exposed steel belt after being heated, thereby achieving a better sealing effect. The arc design can also reduce the resistance generated by the plastic during the flow process and improve the sealing speed and quality. In other application embodiments, the groove surface of the annular sealing groove 31 is set in other shapes, such as trapezoidal, V-shaped, etc.

[0029] Reference Figure 2 , the flanging heating mold 3 is detachably arranged on the heating plate 2, which is convenient for replacement and maintenance. Specifically, a mounting hole 321 is provided on the base plate 32, a bolt 322 is passed through the mounting hole 321, and the bolt 322 is threadedly connected with a clamping plate 34. When the flanging heating mold 3 is installed, the base plate 32 and the clamping plate 34 are respectively arranged at the two ends of the heating plate 2, and the heating plate 2 is provided with a through hole 21 for the bolt 322 to pass through. In this way, the flanging heating mold 3 can be conveniently fixed on the heating plate 2, and it is also convenient for disassembly and replacement.

[0030] Reference Figure 2 A positioning block 323 is fixedly arranged on the substrate 32, the positioning block 323 is adapted to the through hole 21, and the mounting hole 321 passes through the positioning block 323, and the substrate 32 and the heating plate 2 are spaced apart. The positioning block 323 is used to ensure the accurate position of the substrate 32 during installation to avoid deviation affecting the sealing effect. At the same time, the addition of the positioning block 323 enables the substrate 32 and the heating plate 2 to be spaced apart from each other at the end faces close to each other, thereby effectively reducing the direct conduction of heat.

[0031] Reference Figure 2 , 3The substrate 32 is provided with a heat exchange tube 324, which can be made of copper tube or stainless steel tube. These two materials have good corrosion resistance and thermal conductivity. The heat exchange tube 324 abuts against the heat-conducting ring 33, and the heat exchange tube 324 is connected with a water inlet pipe 325 and a water outlet pipe 326. When in use, the water inlet pipe 325 and the water outlet pipe 326 can be connected to the cooling water system. When the end face of the steel-plastic composite pipe is sealed after hot melt, coolant is introduced into the heat exchange tube 324 through the water inlet pipe 325, and the heat-conducting ring 33 is quickly cooled and cooled by the coolant, so that the plastic on the end face of the steel-plastic composite pipe is quickly cooled and solidified, thereby ensuring the sealing quality of the end face of the steel-plastic composite pipe. Furthermore, the temperature of the heat-conducting ring 33 can be adjusted by setting the heat exchange tube 324, and the excess heat is taken away by the circulating water flow, so that the temperature of the heat-conducting ring 33 is kept within an appropriate range, and the heat-conducting ring 33 is prevented from being overheated and causing the plastic to burn or deform.

[0032] Reference Figure 1 , 4 A sliding plate 4 is slidably arranged on the base 1 along a direction perpendicular to the heating plate 2. Guide rails 13 are fixedly arranged on the base 1 and on both sides of the sliding plate 4. The sliding plate 4 is slidably arranged on the two guide rails 13 for positioning the sliding direction of the sliding plate 4. A driving member 14 for driving the sliding plate 4 to slide is arranged on the base 1. The driving member 14 includes a rodless cylinder, which is fixedly arranged on the base 1, and a piston of the rodless cylinder is fixedly connected to the sliding plate 4 for driving the sliding plate 4 to slide.

[0033] Reference Figure 4 A positioning frame 5 is provided on the sliding plate 4 for sliding along a direction perpendicular to the heating plate 2. Two guide rods 51 are fixedly provided on the positioning frame 5. The two guide rods 51 are both slidably penetrated on the sliding plate 4, and end plates 511 are fixedly provided on the end surfaces of the two guide rods 51 away from the positioning frame 5. An elastic member 41 for driving the positioning frame 5 to slide toward the flanging heating mold 3 is provided on the sliding plate 4. The elastic member 41 includes a compression spring. Compression springs are sleeved on the two guide rods 51, and the two ends of the compression springs are respectively in contact with the positioning frame 5 and the sliding plate 4.

[0034] Reference Figure 4, the positioning frame 5 is provided with a fixing assembly for fixing the steel-plastic composite pipe, the fixing assembly includes a first clamping frame 52, a second clamping frame 53 and a bidirectional cylinder 54, the bidirectional cylinder 54 is fixedly arranged on the positioning frame 5, the first clamping frame 52 and the second clamping frame 53 are respectively fixedly arranged on the two piston rods of the bidirectional cylinder 54, and a clamping interval for clamping the steel-plastic composite pipe is formed between the first clamping frame 52 and the second clamping frame 53, and a rubber pad 55 is arranged at one end of the first clamping frame 52 and the second clamping frame 53 close to each other. The design of the sliding plate 4 and the positioning frame 5 can realize the accurate positioning and stable fixing of the steel-plastic composite pipe, ensure the position accuracy and stability during the sealing process, and effectively avoid the sealing problem caused by position offset. And when the steel-plastic composite pipe is sealed, the steel-plastic composite pipe is always pressed against the flanging heating mold 3 by the compression spring, so that the plastic at the sealing end face of the steel-plastic composite pipe can be squeezed and deformed toward the middle along the groove surface of the annular sealing groove 31 after being hot-melted, and then wrap the exposed steel belt. Realize automated sealing operations, improve production efficiency and automation, and ensure the consistency and reliability of sealing quality.

[0035] The implementation principle of the hot-melt flanging sealing device for a steel-plastic composite pipe in the embodiment of the present application is as follows: when sealing the end face of the steel-plastic composite pipe, an arc-shaped notch is firstly opened on the sealing end face of the steel-plastic composite pipe, and the steel strip inside the steel-plastic composite pipe is exposed, and the steel-plastic composite pipe is fixed on the positioning frame 5, and the rodless cylinder drives the positioning frame 5 to slide, so that the sealing end face of the steel-plastic composite pipe is placed in the annular sealing groove 31 of the flanging heating mold 3, and the steel-plastic composite pipe is pressed against the side wall of the annular sealing groove 31 under the elastic force of the compression spring. The heat-conducting ring 33 of the flanging heating mold 3 is heated by the heating plate 2. In this process, the plastic at the sealing end face of the steel-plastic composite pipe is hot-melted, and under the action of the elastic force of the compression spring, the melted plastic is squeezed and deformed along the groove surface of the annular sealing groove 31 to the middle part, completely covering and sealing the exposed steel strip, thereby effectively solving the problem of exposed steel strip at the end face of the steel-plastic composite pipe and improving the overall sealing and durability of the steel-plastic composite pipe.

[0036] The present application also discloses a sealing method of a hot-melt flanging sealing device for a steel-plastic composite pipe, comprising the following steps: S1. Open an arc-shaped notch on the sealing end face of the steel-plastic composite pipe, and expose the steel belt inside the steel-plastic composite pipe; S2, placing the sealed end surface of the steel-plastic composite pipe into the annular sealing groove 31 of the flanging heating mold 3; S3, the flanging heating mold 3 is heated by the heating plate 2, and at the same time, a certain pressure is applied to the steel-plastic composite pipe so that the steel-plastic composite pipe is pressed against the flanging heating mold 3. In this process, the plastic at the sealing end face of the steel-plastic composite pipe is hot-melted and squeezed and deformed toward the middle along the groove face of the annular sealing groove 31, thereby wrapping the exposed steel strip.

[0037] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hot-melt flanging sealing device for a steel-plastic composite pipe, characterized in that: The invention comprises a base (1), a heating plate (2) fixedly arranged on the base (1), a flanging heating mold (3) fixedly arranged on the heating plate (2), an annular sealing groove (31) adapted to the steel-plastic composite pipe being arranged on the flanging heating mold (3), and a groove surface of the annular sealing groove (31) being arc-shaped.

2. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 1, characterized in that: The flanging heating mold (3) comprises a base plate (32) fixedly arranged on the heating plate (2), and a heat-conducting ring (33) embedded in the base plate (32); the base plate (32) is made of a heat-insulating material; the annular sealing groove (31) is provided on the heat-conducting ring (33) along the circumference of the heat-conducting ring (33); and the heat-conducting ring (33) abuts against the end surface of the heating plate (2).

3. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 2 is characterized in that: A heat exchange tube (324) is inserted into the base plate (32), the heat exchange tube (324) is in contact with the heat conductive ring (33), and the heat exchange tube (324) is connected to a water inlet pipe (325) and a water outlet pipe (326).

4. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 2, characterized in that: The flanging heating mold (3) is detachably arranged on the heating plate (2).

5. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 4, characterized in that: The base plate (32) is provided with a mounting hole (321), a bolt (322) is inserted into the mounting hole (321), and the bolt (322) is threadedly connected to a clamping plate (34). The base plate (32) and the clamping plate (34) are respectively arranged at two ends of the heating plate (2), and the heating plate (2) is provided with a through hole (21) for the bolt (322) to pass through.

6. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 5, characterized in that: A positioning block (323) is fixedly arranged on the base plate (32), the positioning block (323) is matched with the through hole (21), and the mounting hole (321) passes through the positioning block (323), and the base plate (32) and the heating plate (2) are arranged at a distance.

7. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 1, characterized in that: A positioning frame (5) is provided on the base (1) for sliding in a direction approaching or moving away from the flanging heating mold (3), a driving member (14) is provided on the base (1) for driving the positioning frame (5) to slide, and a fixing component for fixing the steel-plastic composite pipe is provided on the positioning frame (5).

8. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 7, characterized in that: A sliding plate (4) is provided on the base (1) for sliding in a direction approaching or moving away from the flanging heating mold (3); the driving member (14) is used to drive the sliding plate (4) to slide; the positioning frame (5) is slidably provided on the sliding plate (4); and an elastic member (41) is provided on the sliding plate (4) for driving the positioning frame (5) to slide in a direction approaching the flanging heating mold (3).

9. The hot-melt flanging sealing device for a steel-plastic composite pipe according to claim 7, characterized in that: The fixing assembly comprises a first clamping frame (52), a second clamping frame (53) and a bidirectional cylinder (54); the bidirectional cylinder (54) is fixedly arranged on the positioning frame (5); the first clamping frame (52) and the second clamping frame (53) are respectively fixedly arranged on two piston rods of the bidirectional cylinder (54); and a clamping section for clamping the steel-plastic composite pipe is formed between the first clamping frame (52) and the second clamping frame (53).

10. A sealing method based on the hot-melt flanging sealing device for steel-plastic composite pipes according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Open an arc-shaped notch on the sealing end face of the steel-plastic composite pipe, and expose the steel belt inside the steel-plastic composite pipe; S2, placing the sealed end surface of the steel-plastic composite pipe into the annular sealing groove (31) of the flanging heating mold (3); S3, the flanging heating mold (3) is heated by the heating plate (2), and at the same time, a certain pressure is applied to the steel-plastic composite pipe so that the steel-plastic composite pipe is pressed against the flanging heating mold (3). During this process, the plastic at the sealing end surface of the steel-plastic composite pipe is hot-melted and squeezed and deformed toward the middle along the groove surface of the annular sealing groove (31), thereby wrapping the exposed steel strip.

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