A welding die suitable for multi-specification polyolefin pipes

Abstract

This utility model discloses a welding die head suitable for polyolefin pipes of various specifications, including a punch and a die that cooperate with each other. The punch includes a support base and a hot-melt boss. The support base is disc-shaped, and the hot-melt boss is a stepped cylindrical shape with its diameter gradually changing along its axial direction. The end face of the hot-melt boss with the largest diameter is fixedly attached to one end face of the support base, and the hot-melt boss and the support base are coaxial. A first threaded hole is opened on the other end face of the support base. The die includes a die body with a hot-melt groove. The hot-melt groove is a stepped circular groove with its diameter gradually changing along its axial direction, and its diameter is largest at the opening. A second threaded hole is also opened on the die body. This welding die head has a simple structure and ingenious design, and can be used for hot-melt welding of polyolefin pipes of different specifications, effectively improving the construction efficiency of polyolefin pipe installation and extending the service life of the die head.

Description

Technical Field

[0001] This utility model relates to the field of polyolefin pipe installation technology, specifically to a welding die head suitable for polyolefin pipes of various specifications. Background Technology

[0002] Polyolefin pipes mainly include plastic pipes made from polyolefin materials such as PP-R, PE-RT, and PB through melt extrusion. Under the guidance of the national policy of replacing steel with plastics, polyolefin pipes have been widely used in home decoration, municipal engineering, and other fields. Due to their lightweight, corrosion resistance, good flexibility, and long service life, polyolefin pipes have replaced ordinary galvanized steel pipes, cast iron pipes, and other pipe materials in many fields, and have broad market prospects.

[0003] In the home improvement industry, polyolefin pipes are typically available in various specifications, with DN20, DN25, and DN32 being the three most common sizes. Since polyolefin pipes are not installed in a straight line, they often require cutting and welding to achieve bends based on the actual water pipe layout. Therefore, it's generally necessary to prepare appropriate welding dies based on the pipe's specifications. Typically, a specific die can only weld pipes of that size; for example, a DN20 die is only suitable for welding DN20 pipes. When welding pipes of different sizes, such as DN25 or DN32, the corresponding die must be replaced, and reheating is required. This process is cumbersome, impacting construction efficiency, and frequent die disassembly and assembly also shortens the die's lifespan. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a welding die head suitable for polyolefin pipes of various specifications. The welding die head has a simple structure and ingenious design, and can be used for hot melt welding of polyolefin pipes of different specifications, effectively improving the construction efficiency of polyolefin pipe installation and extending the service life of the die head.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0006] A welding die head suitable for multi-specification polyolefin pipes includes a punch and a die that cooperate with each other. The punch includes a support base and a hot-melt boss. The support base is disc-shaped, and the hot-melt boss is a stepped cylindrical shape. The diameter of the hot-melt boss gradually changes along its axial direction. The end face of the hot-melt boss with the largest diameter is fixedly attached to one end face of the support base, and the hot-melt boss and the support base are coaxial. A first threaded hole is opened on the other end face of the support base. The die includes a die body. A hot-melt groove is opened on the die body. The hot-melt groove is a stepped circular groove. The diameter of the hot-melt groove gradually changes along its axial direction. The diameter of the hot-melt groove is the largest at the opening. A second threaded hole is also opened on the die body.

[0007] The punch is an integrally formed structure, with the first threaded hole penetrating the support base and the bottom of the first threaded hole located in the hot-melt boss.

[0008] The first threaded hole is coaxial with the hot-melt boss or support.

[0009] The outer contour of the die body is cylindrical, the hot melt groove is coaxial with the die body, and the opening of the hot melt groove is located on one end face of the die body.

[0010] The second threaded hole is coaxial with the hot melt groove, and the opening of the second threaded hole is located on the other end face of the die body.

[0011] The second threaded hole is connected to the hot melt groove.

[0012] The dimensions of the hot melt boss match the dimensions of the hot melt groove, and the hot melt boss can be accommodated in the hot melt groove.

[0013] Compared with the prior art, the beneficial effects and advantages of this utility model are as follows:

[0014] 1. The die head has a simple structure. By designing a variable-diameter hot-melt boss and hot-melt concave, it can achieve hot-melt welding of pipes with different outer diameters and pipe fittings with different inner diameters through one installation and one heating. This effectively improves the construction efficiency of pipes and avoids the need to frequently change dies of different sizes, thus effectively extending the service life of the die head.

[0015] 2. The dimensions of the hot melt boss and hot melt concave of the die head are changed in the axial direction. Compared with the radial change method, the size of the heater can be effectively reduced, making it easier to carry. At the same time, it can save energy and reduce the cost of hot melt welding.

[0016] 3. The hot-melt boss of the punch on the die head can be accommodated in the cavity of the die, which facilitates one-to-one storage of the punch and die, avoids confusion during use, and further improves construction efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the punch.

[0018] Figure 2 This is a schematic diagram of the internal structure of the punch.

[0019] Figure 3 This is a schematic diagram of the external structure of the die.

[0020] Figure 4 This is a schematic diagram of the internal structure of the die.

[0021] Wherein, 1-punch: 101-support base, 102-hot melt boss, 103-first threaded hole; 2-die: 201-die body, 202-hot melt groove, 203-second threaded hole. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] The welding die head provided in this embodiment, suitable for multi-specification polyolefin pipes, includes a punch 1 and a die 2 that cooperate with each other. The punch is used for hot-melting polyolefin pipe fittings, and the die is used for hot-melting polyolefin pipes.

[0024] like Figure 1 and Figure 2 As shown, the punch 1 is an integrally formed structure, including a support base 101 and a hot-melt boss 102. The support base 101 is disc-shaped, and the hot-melt boss 102 is a three-step cylindrical shape. The diameter of the hot-melt boss 102 gradually changes along its axial direction. The end face of the hot-melt boss 102 with the largest diameter is fixedly attached to one end face of the support base 101, and the hot-melt boss 102 is coaxial with the support base 101.

[0025] In this embodiment, the diameters of the three hot-melt boss segments of the hot-melt boss 102 with different diameters are respectively matched with the inner diameters of the three specifications of polyolefin pipe fittings, and the three hot-melt boss segments can respectively hot-melt the inner walls of the three specifications of polyolefin pipe fittings.

[0026] The other end face of the support base 101 has a first threaded hole 103, which is coaxial with the support base 101. The first threaded hole 103 passes through the support base 101, and the bottom of the first threaded hole 103 is located in the hot melt boss 102. Through the first threaded hole 103, the punch 1 can be fixed to the hot melt heater using a corresponding screw.

[0027] like Figure 3 and Figure 4 As shown, the die 2 includes a die body 203, the outer contour of which is cylindrical. A hot melt groove 202 is formed on one end face of the die body 203. The hot melt groove 202 is a three-step circular groove, and it is coaxial with the die body 201. The diameter of the hot melt groove 202 gradually changes along its axial direction, with the largest diameter at the opening of the hot melt groove 202.

[0028] In this embodiment, the diameters of the three hot melt groove sections of the hot melt groove 202 are respectively matched with the outer diameters of the polyolefin pipes of the three specifications of dn20, dn25 and dn32, and the three hot melt groove sections can respectively heat melt the outer walls of the polyolefin pipes of the three specifications of dn20, dn25 and dn32.

[0029] A second threaded hole 203 is provided on the other end face of the die body 201. The second threaded hole 203 is coaxial with the hot melt groove 202 and communicates with the hot melt groove 202. The die 2 can be fixed to the hot melt heater using a corresponding screw through the second threaded hole 203.

[0030] The dimensions of the hot melt boss 102 match the dimensions of the hot melt groove 202, and the hot melt boss 102 can be accommodated in the hot melt groove 202. When the die 2 and the punch 1 are not in use, the die 2 and the punch 1 can be stored one-to-one to avoid confusion during later use.

[0031] When two pipes need to be heat-fused together during pipe installation, the concave mold 2 and the convex mold 1 are installed on the heat fusion heater respectively. Then, the corresponding heat fusion groove section is selected according to the diameter of the pipe for heat fusion. Next, the corresponding pipe fittings are heat-fused with the corresponding heat fusion boss section. Finally, the heat-fused pipes and fittings are connected and cooled.

Claims

1. A welding die suitable for use with multi-gauge polyolefin tubing, characterized by: The device includes a punch and a die that cooperate with each other. The punch includes a support base and a hot-melt boss. The support base is disc-shaped, and the hot-melt boss is a stepped cylindrical shape. The diameter of the hot-melt boss gradually changes along its axial direction. The end face of the hot-melt boss with the largest diameter is fixedly attached to one end face of the support base, and the hot-melt boss and the support base are coaxial. The other end face of the support base has a first threaded hole. The die includes a die body. The die body has a hot-melt groove. The hot-melt groove is a stepped circular groove. The diameter of the hot-melt groove gradually changes along its axial direction. The diameter of the hot-melt groove is the largest at the opening. The die body also has a second threaded hole.

2. The welding die suitable for multi-specification polyolefin pipe according to claim 1, characterized in that: The punch is an integrally formed structure, with the first threaded hole penetrating the support base and the bottom of the first threaded hole located in the hot-melt boss.

3. The welding die suitable for multi-specification polyolefin pipe according to claim 2, characterized in that: The first threaded hole is coaxial with the hot-melt boss or support.

4. The welding die suitable for multi-specification polyolefin pipe according to claim 1, characterized in that: The outer contour of the die body is cylindrical, the hot melt groove is coaxial with the die body, and the opening of the hot melt groove is located on one end face of the die body.

5. The welding die head for multi-specification polyolefin pipes according to claim 4, characterized in that: The second threaded hole is coaxial with the hot melt groove, and the opening of the second threaded hole is located on the other end face of the die body.

6. The welding die head for multi-specification polyolefin pipes according to claim 5, characterized in that: The second threaded hole is connected to the hot melt groove.

7. The welding die head for multi-specification polyolefin pipes according to claim 1, characterized in that: The dimensions of the hot melt boss match the dimensions of the hot melt groove, and the hot melt boss can be accommodated in the hot melt groove.

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