Gradient thermal conductivity mold for hot melt socket plastic pipe and fitting
By designing a gradient thermal conductivity mold and utilizing high and low thermal conductivity materials and a limiting structure, the problem of simultaneous melting of thick-walled and thin-walled pipes and fittings in hot-melt connection was solved, achieving an efficient and stable connection effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI WEIXING NOVEL BUILDING MATERIAL
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing technology, it is difficult to unify the heating time and temperature parameters of thick-walled and thin-walled plastic pipes and fittings during the hot-melt connection process, which leads to insufficient connection strength or overheating and deformation, increases production complexity and cost, and makes it difficult to avoid melt overflow.
A gradient thermal conductivity mold is used, which utilizes a punch made of high thermal conductivity material and a die made of low thermal conductivity material, combined with a limiting ring and an annular groove, to control the hot melting rate of thick-walled and thin-walled pipes, ensure synchronous melting, and prevent the thin-walled pipes from shrinking in diameter and accommodate molten overflow through the limiting ring.
It enables simultaneous melting of thick-walled and thin-walled pipes and fittings, improves connection strength, prevents deformation of thin-walled pipes, reduces production complexity and cost, and ensures connection quality.
Smart Images
Figure CN224296610U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hot-melt splicing technology for pipes, specifically relating to a gradient thermal conductivity mold for hot-melt splicing plastic pipes and fittings. Background Technology
[0002] Hot-melt joining, as an efficient and reliable connection method, involves heating the contact surfaces of pipes and fittings until they reach a molten state before butt welding, thus achieving a strong connection. Currently, uniform heating time and temperature parameters are typically used for heating pipes and fittings. For thin-walled pipes, the heat conduction path is short, and heat is easily and quickly transferred to a molten state; however, for thick-walled fittings, due to their greater wall thickness, heat conduction takes longer to reach the appropriate melting temperature internally. If the heating time and temperature are followed according to thin-walled pipes, thick-walled fittings cannot be fully melted, resulting in insufficient connection strength; if the heating requirements of thick-walled fittings are used as the standard, thin-walled pipes may deform or carbonize due to overheating, seriously affecting product quality and connection effectiveness. To address this, manufacturers often use methods such as segmented heating or heating with different temperature gradients. However, these methods not only increase the complexity and cost of the production process but also make it difficult to avoid excessive overflow of molten material from the pipe end faces, affecting pipe quality. Summary of the Invention
[0003] The purpose of this invention is to address the above-mentioned problems by providing a gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings includes a punch body that mates with thick-walled pipe fittings and a die body that mates with thin-walled pipe fittings. The punch body is made of a high thermal conductivity metal material and the die body is made of a low thermal conductivity metal material. The inner side of the die body has a limiting ring, and an annular groove for inserting the thin-walled pipe is formed between the outer circumferential side of the limiting ring and the inner circumferential side of the die body. The limiting ring can effectively prevent the thin-walled pipe from over-melting and causing the problem of diameter reduction and collapse, ensuring the hot-melt effect of the thin-walled pipe. The annular groove facilitates the positioning and insertion of the thin-walled pipe in the die body and ensures the hot-melt stability of the thin-walled pipe in the die body, thus ensuring the hot-melt range of the pipe.
[0005] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the thermal conductivity of the punch is more than 2.5 times that of the die. The thick-walled pipes are thicker, and the punch can improve the hot-melt efficiency of the thick-walled pipes. It can also control the hot-melt time of the thick-walled pipes to be consistent with that of the thin-walled pipes, thus ensuring the hot-melt connection effect between the thick-walled pipes and the thin-walled pipes.
[0006] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the thermal conductivity of the punch is 2.5 to 5 times that of the die.
[0007] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the thermal conductivity of the punch is four times that of the die.
[0008] In the aforementioned gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings, the concave mold body is made of iron or alloy steel, and the convex mold body is made of aluminum or copper alloy. The use of iron and alloy steel materials ensures a lower thermal conductivity of the concave mold body, while the use of aluminum or copper alloy materials ensures a higher thermal conductivity of the convex mold body.
[0009] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the thermal conductivity of the concave mold body is 50-80 W / m·K, which can slow down the hot-melt rate of thin-walled pipes.
[0010] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the thermal conductivity of the punch is 200-250 W / m·K, which can improve the hot-melt rate of thick-walled pipes and fittings, making it easier for the hot-melt rates of thin-walled pipes and thick-walled pipes to reach a synchronous melting state, thus ensuring the insertion effect.
[0011] In the aforementioned gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, the die body includes a die base. One end of the die base has a die annular portion coaxially connected to the die base. A limiting ring is coaxially disposed on the upper end of the die base, and the annular groove is formed between the outer circumferential side of the limiting ring and the inner circumferential side of the die annular portion. The die base facilitates the fixing of the die body on the hot melt machine, and the die annular portion can limit the outer circumferential side of the thin-walled pipe, ensuring the stability of the thin-walled pipe within the die body and improving the hot-melt effect of the thin-walled pipe.
[0012] In the gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings described above, the width of the annular groove is not less than the wall thickness of the thin-walled pipe, which facilitates the placement of the thin-walled pipe and can accommodate molten overflow.
[0013] In the aforementioned gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings, the height of the limiting ring is 1.2-1.5 times the wall thickness of the thin-walled pipe, which can ensure the limiting effect of the limiting ring on the thin-walled pipe and effectively prevent problems such as diameter reduction and collapse of the thin-walled pipe.
[0014] Compared with existing technologies, the advantages of this utility model are:
[0015] 1. The use of a punch made of high thermal conductivity material and a die made of low thermal conductivity material makes it easy to control the melting rate of thick-walled and thin-walled pipes, ensuring that the thick-walled and thin-walled pipes are in a synchronous melting state.
[0016] 2. The limiting ring can limit and support the thin-walled pipe, effectively preventing the thin-walled pipe from shrinking and effectively reducing the shrinkage rate.
[0017] 3. The annular groove can accommodate the molten overflow of the thin-walled pipe, ensuring the heat-melting effect of the thin-walled pipe. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] Figure 2 This is a schematic diagram of the structure of this utility model.
[0020] In the figure: punch body 1, die body 2, limiting ring 21, annular groove 22, die seat 23, die annular part 24. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0022] like Figure 1 , Figure 2 As shown, this is a gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, including a punch 1 that mates with thick-walled pipe fittings and a die 2 that mates with thin-walled pipe fittings. The punch 1 is made of a high thermal conductivity metal material and the die 2 is made of a low thermal conductivity metal material. The inner side of the die 2 has a limiting ring 21, and an annular groove 22 for inserting thin-walled pipe fittings is formed between the outer side of the limiting ring 21 and the inner side of the die 2. The limiting ring 21 can effectively prevent the thin-walled pipe fittings from over-melting and causing the problem of diameter reduction and collapse, thus ensuring the hot-melt effect of the thin-walled pipe fittings. The annular groove 22 facilitates the positioning and insertion of the thin-walled pipe fittings into the die 2, and ensures the hot-melt stability of the thin-walled pipe fittings in the die 2, thus ensuring the hot-melt range of the pipe fittings.
[0023] Specifically, the thermal conductivity of the punch 1 is more than 2.5 times that of the die 2. The thickness of the thick-walled pipe is relatively large. The punch 1 can improve the heat fusion efficiency of the thick-walled pipe and control the heat fusion time of the thick-walled pipe to be consistent with that of the thin-walled pipe, so as to ensure the heat fusion splicing effect between the thick-walled pipe and the thin-walled pipe.
[0024] like Figure 1 , Figure 2 As shown, the thermal conductivity of the punch 1 is 4 times that of the die 2.
[0025] Furthermore, the die body 2 is made of iron or alloy steel, and the punch body 1 is made of aluminum or copper alloy. The use of iron and alloy steel ensures that the die body 2 has a low thermal conductivity, while the use of aluminum or copper alloy ensures that the punch body 1 has a high thermal conductivity.
[0026] When the die body 2 is made of alloy steel, the thermal conductivity of the die body 2 is 50-80 W / m·K, which can slow down the hot melting rate of thin-walled pipes.
[0027] Combination Figure 1 , Figure 2 As shown, when the punch 1 is made of copper alloy, the thermal conductivity of the punch 1 is 200-250 W / m·K, which can improve the hot melting rate of thick-walled pipes and facilitate the synchronous melting of thin-walled pipes and thick-walled pipes, thus ensuring the insertion effect.
[0028] The die body 2 includes a die base 23. One end of the die base 23 has a die annular portion 24 coaxially connected to the die base 23. A limiting ring 21 is coaxially disposed on the upper end of the die base 23, and an annular groove 22 is formed between the outer circumferential side of the limiting ring 21 and the inner circumferential side of the die annular portion 24. The die base 23 facilitates the fixed placement of the die body 2 on the hot melt machine, and the die annular portion 24 can limit the outer circumferential side of the thin-walled tube, ensuring the stability of the thin-walled tube in the die body 2 and improving the hot melt effect of the thin-walled tube.
[0029] Specifically, the width of the annular groove 22 is not less than the wall thickness of the thin-walled tube, which facilitates the placement of the thin-walled tube and can accommodate molten overflow.
[0030] Combination Figure 2 As shown, the height of the limiting ring 21 is 1.2-1.5 times the wall thickness of the thin-walled pipe, which can ensure the limiting effect of the limiting ring 21 on the thin-walled pipe and effectively prevent the thin-walled pipe from shrinking and collapsing.
[0031] The principle of this embodiment is that the high thermal conductivity punch 1 and the low thermal conductivity die 2 can easily control the hot melting rate of thick-walled pipes and thin-walled pipes, so that the thick-walled pipes and thin-walled pipes can reach a synchronous melting state; the limiting ring 21 can limit the thin-walled pipes, prevent the thin-walled pipes from shrinking in diameter, and the annular groove 22 can accommodate the molten overflow, ensuring the hot melting effect of the thin-walled pipes.
[0032] Example 2
[0033] This embodiment is basically the same as embodiment one in structure and working principle, except that, as follows: Figure 1 , Figure 2As shown, when the thermal conductivity of the punch 1 is 5 times that of the die 2, the punch 1 is made of beryllium copper alloy with a thermal conductivity of 210 W / m·K, and the die 2 is made of 40Cr steel with a thermal conductivity of 42 W / m·K. The thermal conductivity of the punch 1 is 5 times that of the die 2. When the wall thickness of the DN20 thin-walled tube is 2.3 mm, the height of the limiting ring 21 is 3 mm, and the height of the limiting ring 21 is 1.3 times the wall thickness of the thin-walled tube, which can effectively reduce the diameter reduction rate of the thin-walled tube. When the wall thickness of the DN32 thin-walled tube is 2.9 mm, the corresponding height range of the limiting ring 21 is 3.5-4.2 mm.
[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
[0035] Although this document frequently uses terms such as punch body 1, die body 2, limiting ring 21, annular groove 22, die base 23, and die annular portion 24, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.
Claims
1. A gradient thermal conductivity mold for hot-melt socketed plastic pipes and fittings, comprising a punch (1) for mating with thick-walled pipe fittings and a die (2) for mating with thin-walled pipe fittings, characterized in that, The punch (1) is made of a high thermal conductivity metal material and the die (2) is made of a low thermal conductivity metal material. The die (2) has a limiting ring (21) on its inner side, and an annular groove (22) for inserting a thin-walled tube is formed between the outer side of the limiting ring (21) and the inner side of the die (2).
2. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The thermal conductivity of the punch (1) is more than 2.5 times that of the die (2).
3. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The thermal conductivity of the punch (1) is 2.5 to 5 times that of the die (2).
4. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The thermal conductivity of the punch (1) is 4 times that of the die (2).
5. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The concave mold (2) is made of iron or alloy steel, and the convex mold (1) is made of aluminum or copper alloy.
6. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The thermal conductivity of the cavity body (2) is 50-80 W / (m·K).
7. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The thermal conductivity of the punch body (1) is 200-250 W / (m·K).
8. The gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The die body (2) includes a die seat (23), one end of which has a die annular portion (24) coaxially connected to the die seat (23). The limiting ring (21) is coaxially disposed on the upper end of the die seat (23), and the annular groove (22) is formed between the outer circumferential side of the limiting ring (21) and the inner circumferential side of the die annular portion (24).
9. A gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The width of the annular groove (22) is not less than the wall thickness of the thin-walled pipe.
10. A gradient thermal conductivity mold for hot-melt socket plastic pipes and fittings according to claim 1, characterized in that, The height of the limiting ring (21) is 1.2-1.5 times the wall thickness of the thin-walled pipe.