Polyolefin pipe marking line co-extrusion die with improved runner

Abstract

The utility model provides a polyolefin pipe marking line co-extrusion die with an improved runner, which comprises a marking line co-extrusion head, a fixed chuck, a high-sensitivity melt pressure sensor and a temperature sensor, the marking line co-extrusion head is fixed at a mouth die of a machine head of a single-screw extruder through the fixed chuck, and the marking line co-extrusion head is aligned with a marking line embedding port of the mouth die. A marking line feeding pipe of the marking line co-extrusion head is connected with a cavity of the mouth mold, a cavity is formed between the mouth mold and the core mold, a cavity outlet is formed in a mold discharging port, the fixed chuck is fixed to a groove of the mouth mold, a chuck bending fixing plate is arranged on the fixed chuck, a sleeve is fixed to the position, at the bending fixing plate, of the outer portion of the marking line feeding pipe, and a plurality of temperature sensors are fixed to the sleeve. And the high-sensitivity melt pressure sensor is arranged on the marking line feeding pipe. According to the polyolefin pipe marking line co-extrusion die with the improved runner, accurate control of technological parameters can be ensured, the extrusion process is optimized, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipe processing equipment, and in particular relates to a co-extrusion die for marking lines on polyolefin pipes with improved flow channels. Background Technology

[0002] Random copolymer polypropylene (PP-R) pipes for both hot and cold water are manufactured using a single-screw extruder. They possess excellent temperature resistance, superior long-term creep resistance, strong chemical corrosion resistance, and good impact resistance. According to relevant technical specifications, pipes used for cold water transport should have blue markings on the outer wall, while those used for hot water transport should have red markings. Clear markings during on-site construction help classify pipes for different applications and avoid misuse.

[0003] Currently, in the production process of PP-R pipes, the marking line extruder and the PP-R pipe raw material meet and are formed in the extruder die area. The melt pressure and material flow properties inside the extruder affect the appearance and shape of the marking line, making debugging during production very difficult. Utility Model Content

[0004] In view of this, the present invention aims to propose a co-extrusion die for marking lines of polyolefin pipes with improved flow channels, in order to solve the problem that during the production of PP-R pipes, the marking line extruder and the PP-R pipe raw material meet and are formed in the extruder die area, and the melt pressure and material flow properties in the extruder affect the appearance and shape of the marking line, making it very difficult to adjust during the production process.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] This utility model provides a co-extrusion die for marking lines on polyolefin pipes with improved flow channels, including a marking line co-extrusion head, a fixed chuck, a high-sensitivity melt pressure sensor, and a temperature sensor. The marking line co-extrusion head is fixed to the die head of a single-screw extruder by the fixed chuck. The marking line co-extrusion head is aligned with the marking line insertion port of the die, and the marking line feed pipe of the marking line co-extrusion head is connected to the cavity of the die. A cavity is formed between the die and the core die, and the die outlet is the cavity outlet. The fixed chuck is fixed to the groove of the die and is provided with a chuck bending fixing plate. A sleeve is fixed outside the marking line feed pipe at the bending fixing plate, and several temperature sensors are fixed on the sleeve. The high-sensitivity melt pressure sensor is provided on the marking line feed pipe.

[0007] Furthermore, the lower part of the marking line co-extrusion head is connected to the marking line feed pipe, the top of the marking line feed pipe is equipped with a feed pipe valve, the feed pipe valve is equipped with a high-sensitivity melt pressure sensor, and the feed pipe valve is connected to the motor of the single screw extruder.

[0008] Furthermore, temperature sensors are located at the contact point between the sleeve and the fixed chuck, in the middle of the sleeve, and at the connection point between the sleeve and the mandrel.

[0009] Furthermore, the motor of the single-screw extruder is connected to a high-sensitivity melt pressure sensor and a temperature sensor.

[0010] Furthermore, the marking line co-extrusion head is connected to a second heater and a feed pump, which are connected to a first heater and a temperature sensor outside the die. The feed pump is connected to a high-sensitivity melt pressure sensor, a temperature sensor, and the motor of a single-screw extruder.

[0011] Compared with existing technologies, the polyolefin pipe marking line co-extrusion die with improved flow channels described in this utility model has the following advantages:

[0012] (1) The temperature sensor located at the contact point between the sleeve and the fixed chuck in this utility model is used to ensure uniform temperature between the fixed chuck and the sleeve. The temperature sensor located in the middle of the sleeve is used to ensure uniform temperature in the middle of the sleeve. The temperature sensor located at the connection point between the sleeve and the mandrel ensures uniform temperature at the connection point. The combination of these three temperature sensors avoids changes in the material properties of the marking line material in the marking line feed tube due to uneven temperature, and ensures that the fusion temperature of the marking line material and the tube material is suitable. The high-sensitivity melt pressure sensor can measure the pressure change of the melt in real time and accurately during the extrusion process, ensuring accurate control of process parameters. By monitoring the melt pressure in real time, process parameters such as the screw speed controlled by the motor of the extruder, the feed temperature and feed speed at various points can be adjusted in a timely manner to optimize the extrusion process and improve production efficiency.

[0013] (2) In this utility model, the feed pump of the marking line co-extrusion head can control the flow rate of the marking line material entering the die by adjusting the feeding speed of the marking line material, thereby affecting the width of the marking line. During the marking line feeding process, the feed pump needs to be comprehensively controlled with the feeding parameters during the feeding process to improve the feeding efficiency of the marking line, ensure that the marking line can be combined with the operation of the single screw extruder, and improve the overall automation level of the die. Attached Figure Description

[0014] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0015] In the attached diagram:

[0016] Figure 1 This is an isometric view of the co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in this embodiment of the utility model.

[0017] Figure 2 This is a front view schematic diagram of the co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in this embodiment of the utility model;

[0018] Figure 3 This is a cross-sectional view at point AA in the main view of the co-extrusion die for the polyolefin pipe marking line with improved flow channel described in this embodiment of the utility model.

[0019] Figure 4 This is a cross-sectional view of section BB in the main view of the co-extrusion die for the improved flow channel marking line of the polyolefin pipe described in this embodiment of the utility model.

[0020] Figure 5 This is a schematic diagram of the installation of a high-sensitivity melt pressure sensor in the BB section view of the main view of the co-extrusion die for the improved flow channel marking line of polyolefin pipe described in this embodiment of the utility model.

[0021] Figure 6 This is a schematic diagram of the temperature sensor installation in the BB section view of the main view of the co-extrusion die for the improved flow channel marking line of the polyolefin pipe described in this embodiment of the utility model.

[0022] Figure 7 This is a side view of the co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in an embodiment of this utility model;

[0023] Figure 8 This is a side view of the co-extrusion die for the improved flow channel marking line of the polyolefin pipe described in this embodiment of the invention, with a cross-sectional view at point CC.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Mold outlet; 2. Chuck bending and fixing plate; 3. Die; 4. Adjusting screw; 5. Core mold; 6. Head body; 7. Diverter bracket; 8. Air inlet; 9. Fixed chuck; 10. Cavity; 11. Marker line feed pipe; 12. High-sensitivity melt pressure sensor; 13. Feed pipe valve; 14. Marker line co-extrusion head; 15. Fixed flange; 16. Cavity outlet; 17. Marker line embedding port; 18. Temperature sensor. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] See Figures 1-8 As shown, this embodiment provides a co-extrusion die for marking lines of polyolefin pipes with improved flow channels, including a marking line co-extrusion head 14, a fixed chuck 9, a high-sensitivity melt pressure sensor 12, and a temperature sensor 18. The marking line co-extrusion head 14 is fixed to the die 3 of a single-screw extruder head by the fixed chuck 9. The marking line co-extrusion head 14 is aligned with the marking line insertion port 17 of the die 3, and the marking line feed pipe 11 of the marking line co-extrusion head 14 is connected to the cavity 10 of the die 3. A cavity 10 is formed between the die 3 and the core mold 5. The die outlet 1 is the cavity outlet 16. The fixed chuck 9 is fixed in the groove of the die 3 and is provided with a chuck bending fixing plate 2. The marking line feed pipe 11 is fixed with a sleeve at the bending fixing plate 2, and several temperature sensors 18 are fixed on the sleeve. The high-sensitivity melt pressure sensor 12 is provided on the marking line feed pipe 11.

[0031] Specifically, in this embodiment, the lower part of the marking line co-extrusion head 14 is connected to the marking line feed pipe 11, the top of the marking line feed pipe 11 is provided with a feed pipe valve 13, a high-sensitivity melt pressure sensor 12 is provided on the feed pipe valve 13, and the feed pipe valve 13 is connected to the motor of the single screw extruder.

[0032] Specifically, in this embodiment, the temperature sensor 18 is located at the contact point between the sleeve and the fixed chuck 9, in the middle of the sleeve, and at the connection point between the sleeve and the core mold 5.

[0033] Specifically, in this embodiment, the motor of the single-screw extruder is connected to a high-sensitivity melt pressure sensor 12 and a temperature sensor 18.

[0034] Specifically, in this embodiment, the marking line co-extrusion head 14 is connected to the second heater and the feed pump, which is connected to the first heater and temperature sensor 18 outside the die 3. The feed pump is connected to the high-sensitivity melt pressure sensor 12, the temperature sensor 18, and the motor of the single screw extruder.

[0035] In this embodiment, a temperature sensor located at the contact point between the sleeve and the fixed chuck ensures uniform temperature between them. A temperature sensor located in the middle of the sleeve ensures uniform temperature within that area. A temperature sensor located at the connection point between the sleeve and the mandrel ensures uniform temperature at that connection. This combination of three temperature sensors comprehensively prevents changes in the material properties of the marking line material within the feed tube due to uneven temperature distribution, ensuring a suitable fusion temperature between the marking line material and the tube material. A high-sensitivity melt pressure sensor can measure the pressure changes of the melt during extrusion in real time and accurately, ensuring accurate control of process parameters. By monitoring the melt pressure in real time, process parameters such as the screw speed controlled by the extruder motor, the feed temperature at various points, and the feed rate can be adjusted promptly, optimizing the extrusion process and improving production efficiency.

[0036] The single-screw extruder head also includes an adjusting screw 4, a mandrel 5, a die head body 6, a distributor bracket 7, an air inlet 8, and a fixing flange 15. The adjusting screw 4 is used to fix the die head body 6 to the die 3. The mandrel 5 inside the die 3 is used to extrude the tube. The distributor bracket 7 is used to fix the distributor. The air inlet 8 allows air to enter. The fixing flange 15 is fixed to the die head body 6. The marking line co-extrusion head and the extruder die head combine to form a co-extrusion die. The marking line feed pipe is used to transport the marking line material. The marking line feed pipe is separate from the main material flow channel to ensure that the marking line material does not mix with the main material before entering the die, but can mix with the main material after entering the die to produce a finished tube with marking lines.

[0037] The feed pump of the marking line co-extrusion head can control the flow rate of the marking line material entering the die by adjusting the feed speed, thereby affecting the width of the marking line. During the marking line feeding process, the feed pump needs to be comprehensively controlled in conjunction with the feeding parameters to improve the feeding efficiency of the marking line and ensure that the marking line can be integrated with the operation of the single-screw extruder, thereby improving the overall automation level of the die.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A co-extrusion die for marking lines on polyolefin pipes with improved flow channels, characterized in that, The device includes a marking line co-extrusion head (14), a fixed chuck (9), a high-sensitivity melt pressure sensor (12), and a temperature sensor (18). The marking line co-extrusion head (14) is fixed to the die (3) of the single-screw extruder head by the fixed chuck (9). The marking line co-extrusion head (14) is aligned with the marking line insertion port (17) of the die (3), and the marking line feed pipe (11) of the marking line co-extrusion head (14) is aligned with the cavity (10) of the die (3). The die (3) and the core mold (5) are connected to form a cavity (10). The mold outlet (1) is the cavity outlet (16). The fixed chuck (9) is fixed in the groove of the die (3) and a chuck bending fixing plate (2) is provided on it. The marking line feed pipe (11) is fixed outside the bending fixing plate (2) and several temperature sensors (18) are fixed on the sleeve. The high-sensitivity melt pressure sensor (12) is provided on the marking line feed pipe (11).

2. The co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in claim 1, characterized in that, The lower part of the marking line co-extrusion head (14) is connected to the marking line feed pipe (11). The top of the marking line feed pipe (11) is provided with a feed pipe valve (13). A high-sensitivity melt pressure sensor (12) is provided on the feed pipe valve (13). The feed pipe valve (13) is connected to the motor of the single screw extruder.

3. The co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in claim 1, characterized in that, Temperature sensor (18) is located at the contact point between the sleeve and the fixed chuck (9), in the middle of the sleeve, and at the connection point between the sleeve and the core mold (5).

4. The co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in claim 1, characterized in that, The motor of the single screw extruder is connected to a high-sensitivity melt pressure sensor (12) and a temperature sensor (18).

5. The co-extrusion die for the polyolefin pipe marking line with improved flow channel as described in claim 4, characterized in that, The marking line co-extrusion head (14) is connected to the second heater and the feed pump, which is connected to the first heater and the temperature sensor (18) outside the die (3). The feed pump is connected to the high-sensitivity melt pressure sensor (12), the temperature sensor (18), and the motor of the single screw extruder.

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