High-density polyethylene pipe extrusion molding equipment for nuclear power station

Abstract

The utility model relates to high-density polyethylene pipe extrusion molding equipment for a nuclear power station, which is characterized in that the outlet end of a feeding cylinder is fixedly communicated with the inlet end of an extrusion cylinder, the inner cavity of the extrusion cylinder is divided into an extrusion area and a molding area, the inner wall of the extrusion area is coaxially and fixedly connected with an extrusion disc, and the molding area is fixedly connected with a feeding cylinder. A plurality of extrusion holes evenly distributed around the axis of the extrusion disc are formed in the extrusion disc, the left end of the extrusion disc is coaxially and rotationally connected with the right end of an extrusion screw, the left end of the extrusion screw is rotationally connected with the left end of the extrusion area, and the left end of the extrusion barrel is fixedly connected with a motor used for driving the extrusion screw. The right end of the extrusion cylinder is coaxially connected with a copper cooling head through a flange, the copper cooling head is coaxially provided with a cooling cavity, the inner wall of the cooling cavity is fixedly connected with a plurality of heat conduction copper sheets which are uniformly distributed around the axis of the cooling cavity, each heat conduction copper sheet is provided with a flow guide hole, and a water inlet pipe is integrally arranged at the upper end of the copper cooling head; and a water outlet pipe is integrally arranged at the lower end of the copper cooling head.

Description

Technical Field

[0001] This utility model relates to the technical field of polyethylene pipe forming devices, and in particular to an extrusion forming equipment for high-density polyethylene pipes used in nuclear power plants. Background Technology

[0002] Compared to conventional municipal pipelines for water and gas, polyethylene pipes used in nuclear power plants require higher safety performance, necessitating consideration of various factors and their coupling effects. These include pipe weight, temperature, seismic loads, and the coupling effects between them. High-density polyethylene (HDPE) is a polymer material with a relatively dense molecular structure, resulting in high density and strength. It also exhibits excellent resistance to chemical corrosion, abrasion, and temperature adaptability. Therefore, HDPE pipes are an effective and economical solution to corrosion and scaling problems in nuclear power plant pipelines. Furthermore, for the same size, HDPE pipes are lighter than metal pipes, making transportation and installation more convenient.

[0003] High-density polyethylene pipes are generally formed and processed by extrusion molding equipment during the production process. However, the cooling effect of the extrusion head of the existing basic molding equipment is generally poor. For example, in the patent document with publication number CN107718504A, the extrusion head is simply equipped with a cooling chamber and relies on cold air for cooling and shaping. After the extrusion equipment has been used for a long time, the continuous high temperature of the equipment will affect its cooling effect, and its cooling and shaping effect still needs to be improved. In this regard, this application proposes an extrusion molding equipment for high-density polyethylene pipes for nuclear power plants. Utility Model Content

[0004] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides an extrusion molding equipment for high-density polyethylene pipes used in nuclear power plants. The technical solution includes a feeding cylinder, characterized in that the outlet end of the feeding cylinder is fixedly connected to the inlet end of an extrusion cylinder. The inner cavity of the extrusion cylinder is divided into an extrusion zone and a molding zone. An extrusion disc is coaxially fixedly connected to the inner wall of the extrusion zone. The extrusion disc has multiple extrusion holes evenly distributed around its axis. The left end of the extrusion disc is coaxially rotatably connected to the right end of an extrusion screw. The left end of the extrusion screw is rotatably connected to the left end of the extrusion zone. The left end of the extrusion cylinder is fixedly connected to... The motor is used to drive the extrusion screw. A copper cooling head is coaxially connected to the right end of the extrusion barrel via a flange. The copper cooling head has a cooling chamber coaxially formed. Several heat-conducting copper plates are fixedly connected to the inner wall of the cooling chamber and are evenly distributed around its axis. Each heat-conducting copper plate has a guide hole. A water inlet pipe communicating with the cooling chamber is integrally arranged at the upper end of the copper cooling head. A water outlet pipe communicating with the cooling chamber is integrally arranged at the lower end of the copper cooling head. A sealing ring is integrally coaxially arranged at the left end of the copper cooling head. A sealing groove is coaxially formed at the right end of the extrusion barrel and is inserted into the sealing ring. A sealing ring that abuts against the sealing ring is coaxially arranged in the sealing groove.

[0005] Preferably, the extrusion screw is integrally provided with an extrusion spiral.

[0006] Preferably, a first jacket is coaxially arranged at the bottom of the feeding cylinder, and a first electric heating coil is embedded in the first jacket.

[0007] Preferably, the extrusion cylinder is integrally and coaxially arranged with a second jacket located on the left side of the forming cavity, and a second electric heating coil is embedded in the second jacket.

[0008] The beneficial effects of this utility model are:

[0009] 1. In use, the molten high-density polyethylene raw material enters the extrusion cylinder from the feeding cylinder to facilitate the molding operation. The molten raw material first enters the extrusion zone of the extrusion cylinder from the feeding cylinder, and then passes to the right through the extrusion hole on the extrusion disc under the action of the extrusion screw and the extrusion spiral. The material then enters the molding zone through the extrusion hole. The molding zone has a core arranged coaxially to facilitate the formation of a pipe here.

[0010] 2. Furthermore, a copper cooling head is arranged at the right end of the extrusion cylinder, and a cooling chamber is arranged inside the copper cooling head. Cold water is continuously introduced into the cooling chamber from the water inlet pipe, and several heat-conducting copper fins are arranged in the cooling chamber. On the one hand, the heat-conducting copper fins greatly increase the interaction area between the cold water and the cooling chamber, thereby increasing the heat exchange and cooling effect on the pipe. On the other hand, the heat-conducting copper fins can increase the residence time of the cold water in the cooling chamber, and under the resistance of the copper heat-conducting fins, it is easier for the cold water to fill the copper cooling head, thereby improving the heat exchange and cooling effect on the formed pipe.

[0011] 3. Furthermore, both the copper cooling head and the heat-conducting copper fins are made of copper, which gives them high heat transfer efficiency. As a result, the tube formed in the forming zone can quickly transfer its temperature to the heat-conducting copper fins through the copper cooling head. The cold water in the cooling chamber can then be cooled by exchanging heat with the heat-conducting copper fins, thereby reducing the temperature of the tube and facilitating its rapid forming. Attached Figure Description

[0012] Figure 1 This is a full sectional front view of the present invention.

[0013] Figure 2 This is a partial three-dimensional sectional view from the first perspective of this utility model.

[0014] Figure 3 This is a partial stereoscopic view of the present invention from a second perspective.

[0015] Figure Labels

[0016] 1. Feeding cylinder, 2. Extrusion cylinder, 3. Extrusion zone, 4. Forming zone, 5. Extrusion disc, 6. Extrusion orifice, 7. Extrusion screw, 8. Motor, 9. Copper cooling head, 10. Cooling chamber, 11. Thermally conductive copper sheet, 12. Guide hole, 13. Water inlet pipe, 14. Water outlet pipe, 15. Sealing ring, 16. Sealing groove, 17. Sealing ring, 18. Core, 19. Extrusion screw, 20. First jacket, 21. First electric heating coil, 22. Second jacket, 23. Second electric heating coil. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-3 The specific embodiments of this utility model will be described in further detail.

[0018] In the first embodiment, the technical solution is that, when this application is used, the molten high-density polyethylene raw material enters the extrusion cylinder 2 from the feeding cylinder 1 to facilitate the molding operation. The molten raw material first enters the extrusion zone 3 of the extrusion cylinder 2 from the feeding cylinder 1, and then, under the action of the extrusion screw 7 and the extrusion spiral 19, it passes to the right through the extrusion hole 6 on the extrusion disc 5. The material then enters the molding zone 4 through the extrusion hole 6. The molding zone 4 is coaxially arranged with a core 18 to facilitate the formation of a pipe here.

[0019] Furthermore, a copper cooling head 9 is arranged at the right end of the extrusion cylinder 2, and a cooling chamber 10 is arranged inside the copper cooling head 9. Cold water is continuously introduced into the cooling chamber 10 from the water inlet pipe 13, and several heat-conducting copper plates 11 are arranged in the cooling chamber 10. On the one hand, the heat-conducting copper plates 11 greatly increase the interaction area between the cold water and the cooling chamber 10, thereby increasing the heat exchange and cooling effect on the pipe. On the other hand, the heat-conducting copper plates 11 can increase the residence time of the cold water in the cooling chamber 10, and under the resistance of the copper heat-conducting plates, it is easy for the cold water to fill the copper cooling head 9, thereby improving the heat exchange and cooling effect on the formed pipe. Moreover, both the copper cooling head 9 and the heat-conducting copper plates 11 are made of copper, thus having the characteristic of high heat transfer efficiency. Therefore, the pipe formed in the forming zone 4 can quickly transfer its temperature to the heat-conducting copper plates 11 through the copper cooling head 9, and the cold water in the cooling chamber 10 can be cooled by exchanging heat with the heat-conducting copper plates 11, thereby reducing the temperature of the pipe and facilitating its rapid forming. The heat-conducting copper sheet 11 is provided with flow guide holes 12 to facilitate the flow of cold water in the cooling chamber 10.

[0020] In Example 2, based on Example 1, specifically, when this application is used, a first electric heating coil 21 is arranged at the bottom of the feeding cylinder 1 through a first jacket 20, and a second electric heating coil 23 is arranged on the extrusion cylinder 2 through a second jacket 22, thereby maintaining the flow of materials and ensuring that materials can be transported smoothly. The motor 8 at the left end of the extrusion cylinder 2 is started. The motor 8 drives the extrusion screw 7 and the extrusion spiral 19 to rotate as a whole. The raw material that enters the extrusion cylinder 2 through the feeding cylinder 1 is then conveyed from the extrusion zone 3 to the forming zone 4 through the extrusion disc 5 under the action of the extrusion spiral 19. The extrusion disc 5 is provided with extrusion holes 6 to facilitate the passage of the raw material. When the raw material passes through the forming zone 4, it can form a tube shape with the action of the core 18. Furthermore, a copper cooling head 9 is arranged for tube forming. The copper cooling head 9 is detachably connected to the right end of the extrusion cylinder 2 through a flange. The left end of the copper cooling head 9 is provided with a sealing ring 15 that is inserted into the sealing groove 16. With the help of the sealing gasket, the sealing of the connection between the copper cooling head 9 and the extrusion cylinder 2 can be ensured, thereby ensuring the forming effect of the tube.

[0021] The upper and lower ends of the copper cooling head 9 are respectively equipped with an inlet pipe 13 and an outlet pipe 14 that are connected to the cooling chamber 10. Cold water is continuously sent into the cooling chamber 10 through the inlet pipe 13, while ensuring the unobstructed flow of the outlet pipe 14. This ensures the circulation of cold water in the cooling chamber 10, so that the cold water can exchange heat and cool down the pipe material initially formed in the forming area 4 through the heat-conducting copper sheet 11 and the copper cooling head 9, thereby ensuring the forming effect.

Claims

1. A high-density polyethylene pipe extrusion molding equipment for nuclear power plants, comprising a feeding cylinder (1), characterized in that, The outlet end of the feeding cylinder (1) is fixedly connected to the inlet end of the extrusion cylinder (2). The inner cavity of the extrusion cylinder (2) is divided into two parts: an extrusion zone (3) and a forming zone (4). An extrusion disc (5) is coaxially fixedly connected to the inner wall of the extrusion zone (3). The extrusion disc (5) has multiple extrusion holes (6) evenly distributed around its axis. The right end of the extrusion screw (7) is coaxially rotatably connected to the left end of the extrusion disc (5). The left end of the extrusion screw (7) is rotatably connected to the left end of the extrusion zone (3). A motor (8) for driving the extrusion screw (7) is fixedly connected to the left end of the extrusion cylinder (2). A copper cooling head (9) is coaxially flanged to the right end of the extrusion cylinder (2). A cooling chamber (10) is coaxially opened in the copper cooling head (9). A number of heat-conducting copper sheets (11) are fixedly connected to the inner wall of the cooling cavity (10) and are evenly distributed around its axis. Each heat-conducting copper sheet (11) is provided with a flow guide hole (12). The upper end of the copper cooling head (9) is integrally arranged with a water inlet pipe (13) communicating with the cooling cavity (10). The lower end of the copper cooling head (9) is integrally arranged with a water outlet pipe (14) communicating with the cooling cavity (10). The left end of the copper cooling head (9) is integrally and coaxially arranged with a sealing ring (15). The right end of the extrusion cylinder (2) is coaxially provided with a sealing groove (16) that is inserted into the sealing ring (15). The sealing groove (16) is coaxially arranged with a sealing ring (17) that abuts against the sealing ring (15). The right end of the extrusion disc (5) is coaxially and fixedly connected with a core (18).

2. The extrusion molding equipment for high-density polyethylene pipes used in nuclear power plants according to claim 1, characterized in that, An extrusion spiral (19) is integrally arranged on the extrusion screw (7).

3. The high-density polyethylene pipe extrusion molding equipment for nuclear power plants according to claim 1, characterized in that, The bottom of the feeding cylinder (1) is coaxially arranged with a first jacket (20), and a first electric heating coil (21) is embedded in the first jacket (20).

4. The high-density polyethylene pipe extrusion molding equipment for nuclear power plants according to claim 1, characterized in that, The extrusion cylinder (2) is integrally and coaxially arranged with a second jacket (22) located on the left side of the molding cavity, and a second electric heating coil (23) is embedded in the second jacket (22).

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