Mould for manufacturing PVC (polyvinyl chloride) hollow pipe

Abstract

The utility model provides a mold for manufacturing a polyvinyl chloride (PVC) hollow pipe, and belongs to the technical field of injection molds. The problems that in the prior art, PVC hollow pipes are difficult to form, and the yield is low are solved. The mold for manufacturing the PVC hollow pipe comprises a core rod and a mold shell arranged on the outer side of the core rod in a sleeving mode, a mold cavity is formed between the mold shell and the core rod, a plurality of forming blocks arranged in the circumferential direction of the core rod at intervals are arranged on the inner side wall of the mold shell, and the forming blocks are in a long strip shape and are arranged in the axial direction of the core rod; the core rod is made of a heat conduction material, and an electric heating tube is inserted into the core rod. The injection molding machine has the advantage that the injection molding yield of the PVC hollow pipeline can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection mold technical field relates to a mold for manufacturing PVC hollow pipe. BACKGROUND

[0002] PVC hollow pipe is the pipeline commonly used in building industry, and its production is that the material melted by heating is injected into the mold cavity by high pressure, and the molded product is obtained after cooling and solidification. For example, the hollow wall sound-absorbing spiral pipe inner wall thickness adjustable mold (application number: 202122976118.6) disclosed in Chinese patent literature comprises an inner cylinder, the inner cylinder comprises a plurality of baffles, the plurality of baffles are distributed in a ring shape, a plurality of adjusting units are arranged on the inner cylinder in the circumferential direction, the adjusting unit comprises a pressing plate and an adjusting rod, the pressing plate is arc-shaped and the pressing plate is pressed on the baffle, and the adjusting rod is used for pushing the pressing plate along the radial direction of the inner cylinder.

[0003] The hollow wall sound-absorbing spiral pipe inner wall thickness adjustable mold has the following disadvantages in the use process: because the plurality of baffles are distributed in the mold cavity in a ring shape, the flow resistance of the material melted by heating in the mold cavity is large, and the solidification speed of the material melted by heating is fast, so that the material melted by heating is difficult to fill the mold, and therefore the molding of the existing PVC hollow pipe is difficult, and the yield is low. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in prior art, and provides a mold for manufacturing PVC hollow pipe. The technical problem to be solved by the utility model is how to improve the injection molding yield of PVC hollow pipe.

[0005] The purpose of the utility model can be realized through the following technical schemes:

[0006] A mold for manufacturing PVC hollow pipe, comprising a core rod and a mold shell sleeved outside the core rod, a mold cavity is formed between the mold shell and the core rod, characterized in that the inner side wall of the mold shell is provided with a plurality of forming blocks arranged in intervals along the circumferential direction of the core rod, the forming blocks are in strip shape and arranged in the axial direction of the core rod, the core rod is made of heat-conducting material, and an electric heating pipe is inserted into the inside of the core rod.

[0007] The mold for manufacturing PVC hollow pipe is provided with a plurality of forming blocks arranged in intervals along the circumferential direction of the core rod on the inner side wall of the mold shell, so that the mold shell and the core rod can directly form the structure of the hollow pipe after cooperation, the use is more convenient, and the assembly error can be avoided, meanwhile, the electric heating pipe is inserted into the inside of the core rod made of heat-conducting material, the flow in the mold cavity can be ensured to have sufficient flow rate when flowing through the inner wall by heating the core rod, the wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding is improved, and the injection molding yield of the PVC hollow pipe is improved.

[0008] In the mold for manufacturing PVC hollow pipe, the middle part of the mandrel is provided with an installation groove in the axial direction, and the electric heating pipe is inserted into the installation groove and connected with the temperature controller. The installation groove facilitates the disassembly and maintenance of the electric heating pipe, and ensures the stability of the installation of the electric heating pipe. The temperature of the mandrel is maintained within a reasonable range by the temperature controller, and the wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding is ensured, thereby improving the injection molding yield of the PVC hollow pipe.

[0009] In the mold for manufacturing PVC hollow pipe, the forming blocks are in the shape of triangular prisms and arranged along the axial direction of the mandrel. The edges of the forming blocks are alternately arranged to face the mold shell and the mandrel, and the outer side of the forming block is integrally connected to the inner side wall of the mold shell. The PVC hollow pipe manufactured by the mold can more efficiently absorb energy during impact, improve impact performance, and reduce deformation and bending problems, thereby ensuring the wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding and improving the injection molding yield of the PVC hollow pipe.

[0010] In the mold for manufacturing PVC hollow pipe, the adjacent two forming blocks are in the shape of a regular triangular prism and an isosceles triangular prism, respectively. On the one hand, the processing and manufacturing of the mold shell are facilitated, and on the other hand, the wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding is ensured, thereby improving the injection molding yield of the PVC hollow pipe.

[0011] In the mold for manufacturing PVC hollow pipe, the inner side of each forming block is consistent with the spacing of the mandrel. The wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding is ensured, thereby improving the injection molding yield of the PVC hollow pipe.

[0012] In the mold for manufacturing PVC hollow pipe, the outer side of each forming block is consistent with the spacing of the mold shell. The wall thickness uniformity of the inner and outer walls of the PVC hollow pipe after molding is ensured, thereby improving the injection molding yield of the PVC hollow pipe.

[0013] In the mold for manufacturing PVC hollow pipe, the end faces of the same side of each forming block are located on the same plane. The flatness of the end of the PVC hollow pipe after molding is ensured, thereby improving the injection molding yield of the PVC hollow pipe.

[0014] In the mold for manufacturing PVC hollow pipe, the edges of the forming blocks are in the shape of an arc. The edges of the forming blocks are designed with rounded corners, which reduces the stress concentration and shear heat of the material flow at this point, improves the processability, and thereby improves the injection molding yield of the PVC hollow pipe.

[0015] Compared with the prior art, the mold for manufacturing PVC hollow pipe has the advantages that: the mold for manufacturing PVC hollow pipe is provided with a plurality of forming blocks arranged on the inner side wall of the mold shell in a circumferential direction of the core rod, so that the mold shell and the core rod can directly form the structure of the hollow pipe after cooperation, the use is more convenient and assembly errors can be avoided, and meanwhile, an electric heating pipe is inserted into the inside of the core rod made of heat-conducting material, the flow in the mold cavity can be ensured to have sufficient flow rate when flowing through the inner wall by heating the core rod, the uniformity of the wall thickness of the PVC hollow pipe after molding is improved, and the injection molding yield of the PVC hollow pipe is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of the three-dimensional structure of the mold for manufacturing PVC hollow pipe.

[0017] Figure 2 is a schematic view of the structure of the mold for manufacturing PVC hollow pipe from the front view after removing the electric heating pipe and the temperature controller.

[0018] Figure 3 is Figure 2 is a partial enlarged view of A in the middle.

[0019] In the figure, 1 is a core rod, 1a is a mounting groove, 2 is a mold shell, 3 is a mold cavity, 4 is a forming block, 5 is an electric heating pipe, and 6 is a temperature controller. DETAILED DESCRIPTION

[0020] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0021] A mold for manufacturing PVC hollow pipe, referring to Figures 1-3 , comprises a core rod 1 and a mold shell 2 sleeved outside the core rod 1, a mold cavity 3 is formed between the mold shell 2 and the core rod 1, the inner side wall of the mold shell 2 is provided with a plurality of forming blocks 4 arranged in a circumferential direction of the core rod 1 in a spaced manner, the forming blocks 4 are in the shape of a long strip and are arranged in the axial direction of the core rod 1, more specifically, the forming blocks 4 are in the shape of a triangular prism and are arranged in the axial direction of the core rod 1, the edges of the plurality of forming blocks 4 are alternately arranged to face the mold shell 2 and the core rod 1, and the outer side of the forming blocks 4 is integrally connected to the inner side wall of the mold shell 2; the core rod 1 is made of a heat-conducting material, and an electric heating pipe 5 is inserted into the inside of the core rod 1, specifically, a mounting groove 1a is axially formed in the middle of the core rod 1, the electric heating pipe 5 is inserted into the mounting groove 1a, and the electric heating pipe 5 is connected with a temperature controller 6. In this embodiment, the edges of the forming blocks 4 are arc-shaped.

[0022] Preferably, two adjacent forming blocks 4 are respectively in the shape of a regular triangular prism and an isosceles triangular prism; preferably, the inner side of each forming block 4 is consistent with the spacing of the mandrel 1, the outer side of each forming block 4 is consistent with the spacing of the mold shell 2, and the end faces on the same side of each forming block 4 are respectively located on the same plane.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A mold for manufacturing PVC hollow pipes, comprising a mandrel (1) and a mold shell (2) sleeved on the outside of the mandrel (1), wherein a mold cavity (3) is formed between the mold shell (2) and the mandrel (1), characterized in that, The inner wall of the mold shell (2) has a plurality of molding blocks (4) spaced apart along the circumference of the core rod (1). The molding blocks (4) are elongated and arranged along the axial direction of the core rod (1). The core rod (1) is made of thermally conductive material and an electric heating tube (5) is inserted inside the core rod (1).

2. The mold for manufacturing PVC hollow pipes according to claim 1, characterized in that, The core rod (1) has an axially formed mounting groove (1a) in the middle, and the heating tube (5) is inserted into the mounting groove (1a). The heating tube (5) is connected to the temperature controller (6).

3. A mold for manufacturing PVC hollow pipes according to claim 1, characterized in that, The molding block (4) is triangular prism-shaped and arranged along the axial direction of the core rod (1). The edges of several molding blocks (4) are alternately arranged facing the mold shell (2) and the core rod (1), and the outer side of the molding block (4) is integrally connected to the inner sidewall of the mold shell (2).

4. A mold for manufacturing PVC hollow pipes according to claim 3, characterized in that, The two adjacent forming blocks (4) are respectively in the shape of a regular triangular prism and an isosceles triangular prism.

5. A mold for manufacturing PVC hollow pipes according to claim 1, 2, 3, or 4, characterized in that, The inner side of each of the molding blocks (4) is aligned with the spacing between the mandrel (1).

6. A mold for manufacturing PVC hollow pipes according to claim 5, characterized in that, The distance between the outer side of each of the molding blocks (4) and the mold shell (2) is consistent.

7. A mold for manufacturing PVC hollow pipes according to claim 6, characterized in that, The end faces of each of the molding blocks (4) on the same side are located on the same plane.

8. A mold for manufacturing PVC hollow pipes according to claim 3 or 4, characterized in that, The edges of the molding block (4) have an arc-shaped transition.

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