Plastic-lined steel pipe production mold
By introducing a preheating cavity, a plasticizing cavity, and a shaping cavity into the mold for producing plastic-lined steel pipes, and by using hydraulic cylinders and ultrasonic transducers, the problems of uneven plastic thickness and air bubbles were solved, achieving efficient plastic molding and reducing material costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-03
AI Technical Summary
Existing plastic-lined steel pipe production molds are prone to uneven plastic thickness, bubbles, or delamination during use, leading to the need for secondary processing, reduced work efficiency, and increased material costs.
A mold structure including a preheating chamber, a plasticizing chamber, and a shaping chamber was designed. Combined with a hydraulic cylinder, a pressing head, and an ultrasonic transducer, air bubbles are eliminated through the preheating, plasticizing, and shaping processes, achieving uniform melting and compaction of the plastic.
It improves the molding quality of plastics, reduces the need for secondary processing, increases work efficiency, and reduces material costs.
Smart Images
Figure CN223961613U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of composite metal pipe processing technology, specifically relating to a production mold for plastic-lined steel pipes. Background Technology
[0002] Plastic-lined steel pipe is a new type of composite pipe, mainly composed of a steel pipe and a plastic lining. The outer layer is a steel pipe, typically made of carbon steel or stainless steel, which has good strength and pressure resistance. The inner layer is plastic, commonly made of materials such as polyethylene (PE) and polyvinyl chloride (PVC), which has good corrosion resistance and insulation. During manufacturing, the steel pipe is processed using corresponding steel plates. In the process, appropriate molds are used to limit and extrude the moving steel plates, rolling them into steel pipes of the appropriate size, thus achieving the processing and shaping of the steel pipe.
[0003] Existing plastic-lined steel pipe production molds still have some defects. During use, most plastic-lined steel pipe production molds are prone to uneven plastic thickness, and may produce bubbles or delamination, requiring secondary processing. This not only reduces work efficiency but also increases material costs. Therefore, we propose a new type of plastic-lined steel pipe production mold. Utility Model Content
[0004] The purpose of this utility model is to provide a mold for producing plastic-lined steel pipes to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a plastic-lined steel pipe production mold, comprising a metal pipe, the top of which is connected to a feed inlet, one end of which is provided with a first flange, the inner side of which is provided with a steel core mold, one end of which is provided with a second flange, the surface of which is provided with fixing bolts, one end of which is provided with a hydraulic cylinder, one side of which is provided with a connecting shaft, one end of which is provided with a pressing head, the inner side of which is provided with a preheating chamber, a plasticizing chamber and a shaping chamber, the outer side of which is provided with a first heating element and a second heating element, and the inner side of which is provided with an ultrasonic transducer.
[0006] Preferably, the metal tube and the steel core mold are fixedly connected by a first flange, a second flange, and fixing bolts.
[0007] Preferably, a connecting shaft is fixedly installed at the output end of the hydraulic cylinder, and a pressing head is fixedly connected to one end of the connecting shaft. The pressing head is slidably disposed in the gap between the steel core mold and the metal tube.
[0008] Preferably, a preheating cavity is provided on the inner side of the metal tube near the pressing head, and a shaping cavity is provided on the inner side of the metal tube away from the pressing head.
[0009] Preferably, a plasticizing cavity is provided between the preheating cavity and the shaping cavity.
[0010] Preferably, the first heating element is installed on the outside of the metal tube at the position corresponding to the preheating chamber, and the second heating element is installed on the outside of the metal tube at the position corresponding to the plasticizing chamber.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] The preheating chamber, plasticizing chamber, and shaping chamber allow for rapid and uniform melting of plastic granules. The hydraulic cylinder drives the pressing head to compact the molten plastic liquid. In conjunction with the ultrasonic transducer, the surface of the steel core mold vibrates, thereby eliminating air bubbles in the molten plastic and further improving the molding effect of the device. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the connection structure between the metal tube and the steel core mold of this utility model;
[0015] Figure 3 This is a schematic diagram of the overall internal cross-sectional structure of this utility model.
[0016] In the diagram: 1. Metal pipe; 2. Feed inlet; 3. First flange; 4. Steel core mold; 5. Second flange; 6. Fixing bolt; 7. Hydraulic cylinder; 8. Connecting shaft; 9. Pressing head; 10. Preheating chamber; 11. Plasticizing chamber; 12. Compacting chamber; 13. Shaping chamber; 14. First heating element; 15. Second heating element; 16. Ultrasonic transducer. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] Please see Figure 1-3This utility model provides a technical solution: a plastic-lined steel pipe production mold, including a metal pipe 1, a feed port 2 connected to the top of the metal pipe 1, a first flange 3 at one end of the metal pipe 1, a steel core mold 4 on the inner side of the metal pipe 1, a second flange 5 at one end of the steel core mold 4, fixing bolts 6 on the surface of the second flange 5, a hydraulic cylinder 7 at one end of the metal pipe 1, a connecting shaft 8 on one side of the hydraulic cylinder 7, a pressing head 9 at one end of the connecting shaft 8, a preheating chamber 10, a plasticizing chamber 11 and a shaping chamber 12 on the inner side of the metal pipe 1, a first heating plate 13 and a second heating plate 14 on the outer side of the metal pipe 1, and an ultrasonic transducer 15 installed on the inner side of the steel core mold 4.
[0019] Specifically, the metal tube 1 and the steel core mold 4 are fixedly connected by the first flange 3, the second flange 5 and the fixing bolts 6. The output end of the hydraulic cylinder 7 is fixedly installed with a connecting shaft 8. One end of the connecting shaft 8 is fixedly connected with a pressing head 9. The pressing head 9 is slidably disposed in the gap between the steel core mold 4 and the metal tube 1. A preheating chamber 10 is provided on the inner side of the metal tube 1 near the pressing head 9. A shaping chamber 12 is provided on the inner side of the metal tube 1 away from the pressing head 9. A plasticizing chamber 11 is provided between the preheating chamber 10 and the shaping chamber 12. A first heating element 13 is installed on the outer side of the metal tube 1 at the position corresponding to the preheating chamber 10. A second heating element 14 is installed on the outer side of the metal tube 1 at the position corresponding to the plasticizing chamber 11.
[0020] In this embodiment, the steel core mold 4 is first inserted into the inner side of the metal tube 1 from one end. The first flange 3 and the second flange 5 are connected and fixed by the fixing bolts 6. This not only achieves the effect of fixed connection between the steel core mold 4 and the metal tube 1, but also seals one end of the gap between the steel core mold 4 and the metal tube 1. The other end of the gap between the steel core mold 4 and the metal tube 1 can be sealed by the pressure head 9, so that the outer wall of the steel core mold 4 and the inner wall of the metal tube 1 form a closed space.
[0021] In practical use: By sealing the feed port 2 with the screw extruder injection port, plastic granules can be conveyed between the steel core mold 4 and the metal tube 1. The preheating chamber 10 and the first heating plate 13 can preheat the internal plastic granules. The plasticizing chamber 11 and the second heating plate 14 can melt the preheated plastic granules. Finally, the hydraulic cylinder 7 drives the pressing head 9 to move laterally in the cavity between the steel core mold 4 and the metal tube 1, thereby compacting the molten plastic liquid inside. The ultrasonic transducer 15 can drive the surface of the steel core mold 4 to vibrate, thereby eliminating the air bubbles in the molten plastic. Finally, wait for the plastic liquid to solidify.
[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A mould for the production of a plastic-lined steel pipe comprising a metal pipe (1), characterised in that: The top of the metal pipe (1) is connected with a feeding port (2), one end of the metal pipe (1) is provided with a first flange (3), the inner side of the metal pipe (1) is provided with a steel core mold (4), one end of the steel core mold (4) is provided with a second flange (5), the surface of the second flange (5) is provided with a fixing bolt (6), one end of the metal pipe (1) is provided with a hydraulic cylinder (7), one side of the hydraulic cylinder (7) is provided with a connecting shaft (8), one end of the connecting shaft (8) is provided with a pressing head (9), the inner side of the metal pipe (1) is provided with a preheating cavity (10), a plasticizing cavity (11) and a shaping cavity (12), the outer side of the metal pipe (1) is provided with a first heating fin (13) and a second heating fin (14), and the inner side of the steel core mold (4) is mounted with an ultrasonic vibrator (15).
2. A plastic-lined steel pipe production mold according to claim 1, characterized in that: The metal pipe (1) and the steel core mold (4) are fixedly connected through the first flange (3), the second flange (5) and the fixing bolt (6).
3. A plastic-lined steel pipe production mold according to claim 1, characterized in that: The output end of the hydraulic cylinder (7) is fixedly connected with the connecting shaft (8), one end of the connecting shaft (8) is fixedly connected with the pressing head (9), and the pressing head (9) is slidably arranged in the gap between the steel core mold (4) and the metal pipe (1).
4. A plastic-lined steel pipe production mold according to claim 1, characterized in that: The inner side of the metal pipe (1) is provided with the preheating cavity (10) near one end of the pressing head (9), and the inner side of the metal pipe (1) is provided with the shaping cavity (12) away from the pressing head (9).
5. A plastic-lined steel pipe production mold according to claim 1, characterized in that: The preheating cavity (10) and the shaping cavity (12) are provided with the plasticizing cavity (11) therebetween.
6. A plastic-lined steel pipe production mold according to claim 1, characterized in that: The first heating fin (13) is mounted on the outer side of the metal pipe (1) corresponding to the position of the preheating cavity (10), and the second heating fin (14) is mounted on the outer side of the metal pipe (1) corresponding to the position of the plasticizing cavity (11). The first heating fin (13) is mounted on the outer side of the metal pipe (1) corresponding to the position of the preheating cavity (10), and the second heating fin (14) is mounted on the outer side of the metal pipe (1) corresponding to the position of the plasticizing cavity (11).