Plastic pipe forming die
By installing internal and external heating pipes and a cold water circulation chamber in the plastic pipe molding die, and combining the optimized design of the molding cavity and connecting bridge, the problem of insufficient strength of plastic pipes is solved, and high strength and uniform molding of plastic pipes are achieved.
Patent Information
- Application Number
- CN202520796366.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-25
AI Technical Summary
The existing plastic pipe molding molds lack heat insulation design, resulting in poor sturdiness of the produced plastic pipes, which cannot meet certain usage requirements.
Inner and outer heating pipes are installed inside the molding cavity of the plastic pipe molding die, and the plastic liquid is heated through the heating pipes. At the same time, a cold water circulation cavity is set on the left side of the die to control the solidification process of the plastic pipe. The cross-sectional design of the molding cavity and the structural optimization of the connecting bridge are combined.
It improves the strength and robustness of plastic pipes, ensures temperature uniformity and extrusion effect during the molding process, and reduces crack formation.
Smart Images
Figure CN223934110U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic pipe production technology, specifically to molds used for plastic pipe forming. Background Technology
[0002] Plastic pipes are commonly used components, and they are produced using plastic pipe molding molds.
[0003] The plastic pipe molding die includes an outer mold and an inner mold. The inner mold has spaced connecting bridges on its outer side, with gaps between adjacent connecting bridges. The outer ends of the connecting bridges have external threads, which are first external threads. The outer mold has internal threads in the middle, which are first internal threads. The first external threads and the first internal threads are connected. The rear side of the outer mold has an internal thread, which is a second internal thread. The second internal thread is a component installed at the plastic liquid outlet of the plastic molding machine. There is a molding cavity on the left side between the outer mold and the inner mold. The plastic liquid enters from the right end of the outer mold and the inner mold, passes through the gaps between adjacent connecting bridges, and then passes through the molding cavity to form a plastic pipe.
[0004] In the existing technology, the plastic pipe forming mold does not have heat insulation components, which results in plastic pipes with poor sturdiness and cannot meet some usage requirements. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a plastic pipe molding die that produces high-strength plastic pipes.
[0006] The technical solution of this utility model is implemented as follows: a plastic pipe forming mold includes an outer mold and an inner mold. The inner mold has connecting bridges spaced apart on its outer side, with gaps between adjacent connecting bridges. The outer ends of the connecting bridges have external threads, which are first external threads. The outer mold has internal threads in the middle, which are first internal threads. The first external threads and the first internal threads are connected in a mating manner. The right side of the outer mold has an internal thread, which is a second internal thread. The second internal thread is a component installed at the plastic liquid outlet of the plastic molding machine. A forming cavity is located on the left side between the outer mold and the inner mold. The feature is that a heating tube connected to a power source is installed inside the inner mold on the side of the forming cavity; this heating tube is an internal heating tube. A heating tube connected to a power source is installed on the outer mold on the side of the forming cavity; this heating tube is an external heating tube.
[0007] Furthermore, the heating tube has a structure with high density or high power near the right side of the molding cavity and low density or low power away from the right side.
[0008] Furthermore, the molding cavity also has a structure in which the cross-sectional area near the right side is larger than the cross-sectional area away from the right side.
[0009] Furthermore, the left and right ends of the cross-section of the connecting bridge are pointed olive-shaped structures.
[0010] Furthermore, there is a cold water circulation chamber on the outer mold on the left side of the molding cavity, which has an inlet pipe and an outlet pipe.
[0011] The beneficial effect of this utility model is that such a plastic pipe forming mold has the advantage of producing plastic pipes with high strength. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the longitudinal section structure of this utility model.
[0013] Figure 2 yes Figure 1 A schematic diagram of the cross-section along the AA direction.
[0014] Figure 3 yes Figure 1 A schematic diagram of the cross-section along the BB direction.
[0015] Among them: 1. Outer mold 11. First internal thread 12. Second internal thread 2. Inner mold 21. Connecting bridge 22. Connecting bridge gap 23. First external thread 3. Molding cavity 41. Inner heating pipe 42. Outer heating pipe 13. Cold water circulation cavity 131. Water inlet pipe 132. Water outlet pipe. Detailed Implementation
[0016] The present invention will be further described below with reference to the accompanying drawings.
[0017] like Figure 1 , 2 As shown in Figure 3, a plastic pipe forming mold includes an outer mold 1 and an inner mold 2. The inner mold has connecting bridges 21 spaced apart on its outer side, with connecting bridge gaps 22 between adjacent connecting bridges. The outer ends of the connecting bridges have external threads, which are first external threads 23. The outer mold has an internal thread in the middle, which is a first internal thread 11. The first external thread and the first internal thread are connected in a mating manner. The right side of the outer mold has an internal thread, which is a second internal thread 12. The second internal thread is a component installed at the plastic liquid outlet of the plastic molding machine. A forming cavity 3 is located on the left side between the outer mold and the inner mold. The characteristic feature is that a heating tube connected to a power source is installed inside the inner mold on the side of the forming cavity, which is an inner heating tube 41. A heating tube connected to a power source is installed on the outer mold on the side of the forming cavity, which is an outer heating tube 42.
[0018] This invention is designed to keep the molten plastic heated in the molding cavity, allowing the molten plastic to be molded while maintaining a high temperature, thus reducing the occurrence of cracks and achieving the purpose of this invention.
[0019] The power cable for the internal heating element can be led out to the outside through the connecting bridge.
[0020] Furthermore, the heating tube has a structure with high density or high power near the right side of the molding cavity and low density or low power away from the right side.
[0021] This design allows the plastic tube to gradually decrease in temperature within the molding cavity as it moves from right to left.
[0022] Furthermore, the molding cavity also has a structure in which the cross-sectional area near the right side is larger than the cross-sectional area away from the right side.
[0023] That is, the cross-section of the molding cavity is an annular structure, and the area of the right annulus of the molding cavity is larger than the area of the left annulus of the molding cavity. This design allows the plastic liquid to be fully compressed in the molding cavity, resulting in a more solid plastic tube.
[0024] To elaborate further, such as Figure 1 , 3 As shown, the left and right ends of the cross-section of the connecting bridge are pointed olive-shaped structures.
[0025] This design reduces the impact of the connecting bridge on the product structure.
[0026] Furthermore, there is a cold water circulation chamber 13 on the outer mold on the left side of the molding cavity, which has an inlet pipe 131 and an outlet pipe 132.
[0027] This invention is designed such that, during use, the inlet pipe is connected to the input water pipe, and the outlet pipe carries out water flowing from the cold water circulation chamber, keeping the plastic tube on the left side of the molding chamber at a low temperature, thus ensuring that the plastic tube processed from the molding chamber is in a solidified, shaped state.
[0028] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.
Claims
1. A plastic pipe molding die, comprising an outer die and an inner die, wherein the inner die has spaced connecting bridges on its outer side, with a gap between adjacent connecting bridges; the outer end of each connecting bridge has an external thread, which is a first external thread; the outer die has an internal thread in its middle, which is a first internal thread; the first external thread and the first internal thread are mated together; the outer die has an internal thread on its right side, which is a second internal thread; the second internal thread is a component installed at the plastic liquid outlet of a plastic molding machine; and a molding cavity is located on the left side between the outer die and the inner die; characterized in that: A heating element connected to a power source is installed inside the inner mold on the side of the molding cavity; this heating element is called the inner heating element. A heating element connected to a power source is installed on the outer mold on the side of the molding cavity; this heating element is called the outer heating element.
2. The plastic pipe forming mold according to claim 1, characterized in that: The heating tube has a structure with high density or high power near the right side of the molding cavity and low density or low power away from the right side.
3. The plastic pipe forming mold according to claim 1 or 2, characterized in that: The molding cavity also has a structure in which the cross-sectional area near the right side is larger than the cross-sectional area away from the right side.
4. The plastic pipe forming mold according to claim 3, characterized in that: The cross-section of the connecting bridge has a pointed, olive-shaped structure at its left and right ends.
5. The plastic pipe forming mold according to claim 3, characterized in that: There is also a cold water circulation chamber on the outer mold on the left side of the molding cavity, which has an inlet pipe and an outlet pipe.