Pre-cooling extrusion mold in PVC-U (unplasticized polyvinyl chloride) pipe

Abstract

The utility model discloses a pre-cooling extrusion mold in a PVC-U pipe, a PVC pipe forming mold is arranged at the front end of a PVC flow dividing mold, a pipe mold ring cavity communicated with a flow dividing channel on the PVC flow dividing mold is arranged on the PVC pipe forming mold, a PVC pipe pre-cooling machine forms a cylindrical structure and is arranged at the front end of the PVC pipe forming mold, and a pipe mold ring cavity communicated with a flow dividing channel on the PVC flow dividing mold is arranged on the PVC pipe forming mold. The outer circle face of the PVC pipe pre-cooling mechanism and the inner ring face of the pipe die ring cavity are arranged on the same cylindrical face. An annular groove is formed in the PVC pipe pre-cooling mechanism, a cooling spiral core block is arranged in the annular groove, a spiral surrounding circulation cooling water channel is formed in the annular groove through the cooling spiral core block, a cooling water inlet pipe communicated with the outer side of the spiral surrounding circulation cooling water channel is arranged on one side of an outer opening of the annular groove, and the outer end of the cooling water inlet pipe penetrates through the PVC extrusion mold. A cooling water discharge pipe is arranged on the other side of the outer opening of the annular groove, the outer end of the cooling water discharge pipe also penetrates through the PVC extrusion mold, and a discharge opening of the cooling water discharge pipe is connected with the bottom of the spiral surrounding circulation cooling water channel through a U-shaped pipeline.

Description

Technical Field

[0001] The utility model relates to the field of cooling equipment for an extrusion die used in the production and processing of PVC pipes, in particular to a pre-cooling extrusion die inside a PVC-U pipe. Background Art

[0002] PVC pipe processing molds are important tools for producing PVC pipes. Their design and manufacturing are based on the shape and size requirements of PVC pipes. The molding of PVC pipes is achieved through the structure and principle of the mold. The mold plays a vital role in the production process of PVC pipes. Its principle is mainly to achieve the molding and cooling of PVC pipes through the structure of the mold. Through reasonable design and manufacturing, the quality and performance of the mold are ensured, so as to produce high-quality PVC pipe products.

[0003] During the extrusion molding of PVC-U pipes, due to fluctuations in the raw materials and the relatively soft tube embryo during extrusion, there will be a surge problem before entering the water tank for finalization, which can easily lead to uneven inner wall of the product and wavy lines, seriously affecting the surface quality of the inner wall of the product. Moreover, the faster the production speed, the more obvious this problem is, which also seriously reduces production efficiency. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a PVC-U pipe internal pre-cooling extrusion die to solve the problem that the PVC-U pipe will surge before entering the water tank for finalization due to fluctuations in raw materials and soft tube embryos during extrusion of the die.

[0005] The utility model is realized by the following technical solutions:

[0006] A PVC-U pipe internal pre-cooling extrusion die, comprising a PVC extrusion die and a PVC pipe pre-cooling mechanism, wherein the PVC extrusion die comprises a PVC diverter die and a PVC pipe forming die, wherein the PVC pipe forming die is arranged at the front end of the PVC diverter die, wherein the PVC pipe forming die is provided with a pipe die ring cavity connected with a diverter channel on the PVC diverter die, wherein the PVC pipe pre-cooling mechanism is provided in a cylindrical structure at the front end of the PVC pipe forming die, wherein the outer cylindrical surface of the PVC pipe pre-cooling mechanism and the inner cylindrical surface of the pipe die ring cavity are arranged on the same cylindrical surface;

[0007] An annular groove is provided in the PVC pipe pre-cooling mechanism, and a cooling spiral core block is provided in the annular groove. The cooling spiral core block forms a spiral circulating cooling water channel in the annular groove. A cooling water inlet pipe connected to the outside of the spiral circulating cooling water channel is provided on one side of the outer opening of the annular groove, and the outer end of the cooling water inlet pipe passes through the PVC extrusion mold; a cooling water discharge pipe is provided on the other side of the outer opening of the annular groove, and the outer end of the cooling water discharge pipe also passes through the PVC extrusion mold, and the discharge port of the cooling water discharge pipe is connected to the bottom of the spiral circulating cooling water channel through a U-shaped pipe.

[0008] Furthermore, a heat insulating ring is provided between the PVC pipe pre-cooling mechanism and the PVC pipe forming die.

[0009] Furthermore, the thermal insulation ring is made of polytetrafluoroethylene.

[0010] Furthermore, the cooling water inlet pipe is in an L-shaped structure, and the cooling water inlet pipe passes through a side of the PVC extrusion mold.

[0011] Furthermore, the cooling water discharge pipe is in an L-shaped structure, and the cooling water discharge pipe passes through the other side of the PVC extrusion die.

[0012] Furthermore, the inner annular surface of the cooling spiral core block is sealingly connected to the inner annular groove surface of the annular groove.

[0013] Furthermore, the outer annular surface of the cooling spiral core block is sealingly connected to the outer annular groove surface of the annular groove.

[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0015] 1. The utility model discloses a PVC-U pipe internal pre-cooling extrusion die. The PVC-U pipe internal pre-cooling extrusion die can effectively solve the problem of surging of the pipe embryo when entering the cooling water tank for sizing by pre-cooling the pipe during extrusion molding in the die, thereby greatly improving the production efficiency and the surface quality of the inner wall of the PVC-U pipe.

[0016] 2. The utility model provides a PVC-U pipe internal pre-cooling extrusion die, which is provided with a cooling spiral core block 8. The cooling spiral core block 8 forms a spiral surrounding circulation cooling water path 9 in the annular groove 7. Compared with the traditional surrounding circulating water cavity, the spiral surrounding circulation cooling water path 9 is cooled evenly and has a high cooling efficiency.

[0017] 3. The utility model provides a PVC-U pipe internal pre-cooling extrusion mold, which adopts a PVC pipe pre-cooling mechanism 2 cooling device, and is isolated from the PVC extrusion mold 1 by a heat insulation ring 13, which can prevent the PVC extrusion mold 1 from affecting the heat conduction of the PVC pipe pre-cooling mechanism 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0019] Figure 1 The utility model is a structural schematic diagram of a PVC-U pipe internal pre-cooling extrusion die.

[0020] Figure 2 It is a structural schematic diagram of the PVC pipe pre-cooling mechanism of the utility model.

[0021] Marks and corresponding parts names in the attached drawings:

[0022] 1-PVC extrusion mold, 2-PVC pipe pre-cooling mechanism, 3-PVC diverter mold, 4-PVC pipe forming mold, 5-diverter channel, 6-tube mold ring cavity, 7-ring groove, 8-cooling spiral core block, 9-spiral surrounding cooling water channel, 10-cooling water inlet pipe, 11-cooling water outlet pipe, 12-U-shaped pipe, 13-insulation ring. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example

[0028] like Figure 1 As shown, the utility model is a PVC-U pipe internal pre-cooling extrusion mold, including a PVC extrusion mold 1 and a PVC pipe pre-cooling mechanism 2, the PVC extrusion mold 1 includes a PVC diverter mold 3 and a PVC pipe forming mold 4, the PVC pipe forming mold 4 is arranged at the front end of the PVC diverter mold 3, and the PVC pipe forming mold 4 is provided with a pipe mold ring cavity 6 connected with the diverter channel 5 on the PVC diverter mold 3. The PVC production material enters the PVC diverter mold 3 by heating and extrusion, and then is shaped and extruded through the PVC pipe forming mold 4. The high-temperature PVC-U pipe material just extruded is unstable and easy to deform. The PVC pipe pre-cooling mechanism 2 is arranged in a cylindrical structure at the front end of the PVC pipe forming mold 4, and the outer cylindrical surface of the PVC pipe pre-cooling mechanism 2 is arranged with the inner annular surface of the pipe mold ring cavity 6; by arranging a cooling device for the PVC pipe pre-cooling mechanism 2 and isolating it from the PVC extrusion mold 1 with a heat insulation ring 13, the heat conduction effect of the PVC extrusion mold 1 on the PVC pipe pre-cooling mechanism 2 can be blocked.

[0029] An annular groove 7 is provided in the PVC pipe pre-cooling mechanism 2, and a cooling spiral core block 8 is provided in the annular groove 7. The cooling spiral core block 8 forms a spiral circulating cooling water channel 9 in the annular groove 7. A cooling water inlet pipe 10 connected to the outside of the spiral circulating cooling water channel 9 is provided on one side of the outer opening of the annular groove 7. The outer end of the cooling water inlet pipe 10 passes through the PVC extrusion mold 1. On the joint of the cooling water inlet pipe 10 on the outside of the PVC extrusion mold 1, the cooling water inlet pipe 10 is externally connected to the cold water tank discharge pipe; a cooling water discharge pipe 11 is provided on the other side of the outer opening of the annular groove 7. The outer end of the cooling water discharge pipe 11 also passes through the PVC extrusion mold 1. The corresponding cooling water discharge pipe 11 is connected to the discharge pipe of the cold water tank. Generally, a cold water tank device that can circulate and cool itself is adopted. The discharge outlet of the cooling water discharge pipe 11 is connected to the bottom of the spiral circulating cooling water channel 9 through a U-shaped pipe 12. The structure of the U-shaped pipe 12 can be designed in a modular structure. Since it is difficult to set a bridge pipe between the discharge outlet of the cooling water discharge pipe 11 and the bottom of the spirally circulating cooling water channel 9 in actual processing and production design, a groove is directly milled on the inner side of the annular groove 7, and a water transfer block is set inside. The U-shaped pipe 12 is set in the water transfer block, so as to achieve the effect of connecting the discharge outlet of the cooling water discharge pipe 11 with the bottom of the spirally circulating cooling water channel 9.

[0030] The inlet and outlet water pipes are directly connected to the mold. The water is fed in and out from both sides of the extrusion mold to achieve pre-cooling inside the PVC pipe. The water flows in the cooling spiral core of the PVC pipe pre-cooling mechanism 2 to take away the heat. The polytetrafluoroethylene heat insulation ring on the PVC extrusion mold 1 is used to block the heat exchange between the mold and the PVC extrusion mold 1, to prevent the mold from hardening the material due to excessive cooling, and to prevent the pre-cooling mechanism from overheating and causing the pre-cooling effect to fail.

[0031] The utility model discloses a PVC-U pipe internal pre-cooling extrusion mold. Cooling water enters the front end of a spiral circulating cooling water channel 9 through a cooling water inlet pipe 10. The cooling water flows around to the bottom of the spiral circulating cooling water channel 9 and then enters the cooling water outlet pipe 11 through a U-shaped pipe 12 for discharge, thereby achieving the cooling effect of the PVC pipe pre-cooling mechanism 2.

[0032] A heat insulating ring 13 is provided between the PVC pipe pre-cooling mechanism 2 and the PVC pipe forming die 4. The heat insulating ring 13 is made of polytetrafluoroethylene. The heat insulating ring 13 can play a heat insulating effect.

[0033] The cooling water inlet pipe 10 is L-shaped and passes through one side of the PVC extrusion mold 1. The cooling water outlet pipe 11 is L-shaped and passes through the other side of the PVC extrusion mold 1. The L-shaped water pipe structure design facilitates waterway setting.

[0034] The inner annular surface of the cooling spiral core block 8 is sealed to the inner annular groove surface of the annular groove 7. The outer annular surface of the cooling spiral core block 8 is sealed to the outer annular groove surface of the annular groove 7. A spirally circulating cooling water path 9 is formed in the annular groove 7 by the cooling spiral core block 8.

[0035] The utility model discloses a PVC-U pipe internal pre-cooling extrusion mold. The PVC-U pipe internal pre-cooling extrusion mold can effectively solve the problem of surging of the pipe embryo when entering the cooling water tank for sizing by pre-cooling the pipe during extrusion molding in the mold, greatly improving the production efficiency while also improving the inner wall surface quality of the PVC-U pipe. By setting a cooling spiral core block 8, the cooling spiral core block 8 forms a spiral surrounding circulation cooling water path 9 in the annular groove 7. Compared with the traditional surrounding circulating water cavity, the spiral surrounding circulation cooling water path 9 is cooled evenly and has high cooling efficiency. The PVC pipe pre-cooling mechanism 2 cooling device is used, and the PVC extrusion mold 1 is isolated by a heat insulation ring 13, which can prevent the PVC extrusion mold 1 from affecting the heat conduction of the PVC pipe pre-cooling mechanism 2.

[0036] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A PVC-U pipe internal precooling extrusion die, comprising a PVC extrusion die (1) and a PVC pipe precooling mechanism (2), characterized in that: The PVC extrusion mold (1) comprises a PVC flow-dividing mold (3) and a PVC pipe forming mold (4); the PVC pipe forming mold (4) is arranged at the front end of the PVC flow-dividing mold (3); the PVC pipe forming mold (4) is provided with a pipe mold ring cavity (6) which is connected with the flow-dividing channel (5) on the PVC flow-dividing mold (3); the PVC pipe pre-cooling mechanism (2) is arranged in a cylindrical structure at the front end of the PVC pipe forming mold (4); the outer cylindrical surface of the PVC pipe pre-cooling mechanism (2) and the inner annular surface of the pipe mold ring cavity (6) are arranged on the same cylindrical surface; An annular groove (7) is provided in the PVC pipe pre-cooling mechanism (2), and a cooling spiral core block (8) is provided in the annular groove (7). The cooling spiral core block (8) forms a spirally circulating cooling water channel (9) in the annular groove (7). A cooling water inlet pipe (10) connected to the outside of the spirally circulating cooling water channel (9) is provided on one side of the outer opening of the annular groove (7), and the outer end of the cooling water inlet pipe (10) passes through the PVC extrusion mold (1); a cooling water outlet pipe (11) is provided on the other side of the outer opening of the annular groove (7), and the outer end of the cooling water outlet pipe (11) also passes through the PVC extrusion mold (1), and the outlet of the cooling water outlet pipe (11) is connected to the bottom of the spirally circulating cooling water channel (9) through a U-shaped pipe (12).

2. A PVC-U pipe internal pre-cooling extrusion die according to claim 1, characterized in that: A heat insulating ring (13) is provided between the PVC pipe pre-cooling mechanism (2) and the PVC pipe forming mould (4).

3. A PVC-U pipe internal pre-cooling extrusion die according to claim 2, characterized in that: The heat insulation ring (13) is made of polytetrafluoroethylene.

4. A PVC-U pipe internal pre-cooling extrusion die according to claim 1, characterized in that: The cooling water inlet pipe (10) is in an L-shaped structure, and the cooling water inlet pipe (10) passes through a side surface of the PVC extrusion mold (1).

5. A PVC-U pipe internal pre-cooling extrusion die according to claim 4, characterized in that: The cooling water discharge pipe (11) is in an L-shaped structure, and the cooling water discharge pipe (11) passes through the other side of the PVC extrusion die (1).

6. A PVC-U pipe internal pre-cooling extrusion die according to claim 1, characterized in that: The inner annular surface of the cooling spiral core block (8) is sealingly connected to the inner annular groove surface of the annular groove (7).

7. A PVC-U pipe internal pre-cooling extrusion die according to claim 6, characterized in that: The outer annular surface of the cooling spiral core block (8) is sealingly connected to the outer annular groove surface of the annular groove (7).

Images