A novel surface co-extrusion device for oxygen barrier heating pipe

Abstract

This utility model discloses a novel surface co-extrusion device for heating pipes with an oxygen barrier layer, relating to the field of heating pipe manufacturing technology. The utility model includes a conveying chamber, a cooling jacket, and a discharging sleeve. A forming sleeve is fixed to one end of the conveying chamber, a cooling jacket is fixed to the end of the forming sleeve away from the conveying chamber, a heat insulation plate is fixed to the end of the cooling jacket away from the forming sleeve, and a discharging sleeve is fixed to the end of the heat insulation plate away from the cooling jacket. A homogenizing plate is fixed in the middle of the conveying chamber, and a central shaft is fixed through the center of the homogenizing plate along its central axis. The central shaft is fixed inside the conveying chamber. Homogenizing holes are uniformly opened throughout the homogenizing plate. An inner filter sleeve is fixed inside the discharging sleeve. This utility model, by setting up the conveying chamber, cooling jacket, and discharging sleeve, solves the problem that during the surface co-extrusion of heating pipes with an oxygen barrier layer, the high surface temperature of the pipe base material and the high fluidity after bonding with the oxygen barrier layer cause uneven thickness of the oxygen barrier layer, and the insufficient uniform forming pressure of the heating pipe.

Description

Technical Field

[0001] This utility model belongs to the field of heating pipe production technology, and in particular relates to a new type of surface co-extrusion device for heating pipes with oxygen barrier layer. Background Technology

[0002] The surface co-extrusion unit for heating pipes is a core auxiliary equipment on the high-performance underfloor heating pipe production line. It is specifically designed to simultaneously co-extrude a permanent color marking line onto the outer surface of pipes such as PEX-a, PEX-b, or PE-RT. This unit melts and feeds the color masterbatch through a micro co-extrusion extruder, and with the help of a precisely designed co-extrusion die, accurately attaches the color strip to the surface of the pipe blank before the main pipe is extruded and shaped. The surface co-extrusion unit for heating pipes with an oxygen barrier layer is a high-tech system integrated into the extrusion production line. Its core function is to precisely co-extrude a layer of ethylene-vinyl alcohol copolymer (EVOH) oxygen barrier layer on the surface of the plastic pipe to prevent oxygen penetration and corrosion of the metal components of the heating system. However, the surface co-extrusion unit for heating pipes with an oxygen barrier layer still has the following drawbacks in actual use: In the process of extruding pipe material, the surface co-extrusion device of heating pipe with oxygen barrier layer outputs the pipe material and extrudes the oxygen barrier layer material through the co-extrusion device to coat the periphery of the heating pipe, thus completing the co-extrusion operation. However, when the pipe material is directly co-extruded, the surface temperature of the heating pipe is high, and the fluidity is high after bonding with the oxygen barrier layer, resulting in uneven thickness of the oxygen barrier layer. Secondly, when the co-extrusion unit extrudes the heating pipe material and the oxygen barrier layer material, the pressure is uneven during the extrusion process, which affects the uniformity of the heating pipe after it is output due to the different forming pressures at different positions. Utility Model Content

[0003] The purpose of this utility model is to provide a new type of surface co-extrusion device for heating pipes with oxygen barrier layer. By setting up a conveying chamber, a cooling jacket and a discharge jacket, it solves the problems of uneven thickness of oxygen barrier layer and insufficient uniform forming pressure of heating pipes caused by the high surface temperature of the pipe base material and the high fluidity after bonding with the oxygen barrier layer during the extrusion of the surface co-extrusion device for heating pipes with oxygen barrier layer.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a novel surface co-extrusion device for heating pipes with an oxygen barrier layer, comprising a conveying chamber, a cooling jacket, and a discharging jacket. A forming sleeve is fixed to one end of the conveying chamber; a cooling jacket is fixed to the end of the forming sleeve away from the conveying chamber; a heat insulation plate is fixed to the end of the cooling jacket away from the forming sleeve; and a discharging jacket is fixed to the end of the heat insulation plate away from the cooling jacket. A homogenizing plate is fixed in the middle of the conveying chamber, and a central shaft is fixed through the center of the homogenizing plate along its central axis. The central shaft is fixed inside the conveying chamber. The homogenizing disc has homogenizing holes evenly distributed throughout. An inner filter sleeve is fixed inside the discharge sleeve. The conveying chamber, cooling sleeve, and discharge sleeve are connected in sequence. A forming sleeve is installed at one end of the conveying chamber for preliminary material forming. The cooling sleeve cools and shapes the pipe. The heat insulation disc insulates the cooling section from the discharge section. The discharge sleeve is used to coat the oxygen barrier layer. The conveying chamber contains a homogenizing disc and a central shaft. The homogenizing disc distributes the material evenly through the homogenizing holes. The central shaft passes through the equipment and is used for internal pipe forming. An inner filter sleeve is installed inside the discharge sleeve to ensure uniform coating of the oxygen barrier layer material.

[0005] Furthermore, a mounting plate is fixed to the end of the conveying chamber away from the forming sleeve, and a conveying port is opened in the center of the end of the conveying chamber near the forming sleeve. Both the cooling sleeve and the forming sleeve have conveying ports extending along their central axes. A mounting plate is provided at one end of the conveying chamber for fixing the entire machine, and a conveying port is provided at the other end. Coaxial conveying ports are also provided inside the cooling sleeve and the forming sleeve for continuous material conveying and initial forming.

[0006] Furthermore, the central shaft passes through the conveying port 1 within the conveying chamber, cooling jacket, and forming sleeve. A material conveying pipe 1 is fixedly connected to the periphery of the conveying chamber. This material conveying pipe 1 is positioned between the homogenizing disc and the mounting disc. The central shaft, passing through the conveying port 1 of the conveying chamber, cooling jacket, and forming sleeve, serves as a support and internal forming mechanism. The side wall of the conveying chamber is connected to the material conveying pipe 1, located between the homogenizing disc and the mounting disc, for inputting pipe material.

[0007] Furthermore, the cooling jacket is hollow inside, and spiral blades are fixed inside. A drain pipe is fixedly connected to the edge of the cooling jacket near the edge of the molded sleeve, and a cooling water pipe is fixedly connected to the edge of the cooling jacket away from the molded sleeve. The hollow structure of the cooling jacket with spiral blades inside guides the cooling water to flow spirally, thereby improving heat exchange efficiency. A cooling water inlet is connected to one side of the cooling jacket, and a drain pipe is provided on the other side to achieve circulating cooling.

[0008] Furthermore, both the discharge sleeve and the heat insulation plate have a second conveying port extending along their central axis. The central axis passes through the second conveying port on both the discharge sleeve and the heat insulation plate, and the second conveying port is located at the center of the discharge sleeve and the heat insulation plate for the passage of the formed pipe. The central axis also passes through this channel to maintain structural continuity and the inner wall forming function.

[0009] Furthermore, the inner diameter of the second conveying port is larger than that of the first conveying port, and the inner diameter of the inner filter sleeve is larger than that of the second conveying port. The inner filter sleeve is disposed inside the discharge sleeve outside the conveying port. The discharge sleeve is fixedly connected to the second conveying pipe on its periphery. The inner diameter of the second conveying port is larger than that of the first conveying port to facilitate the passage of the composite pipe. The inner filter sleeve has an even larger inner diameter and is located outside the second conveying port inside the discharge sleeve, used to homogenize the oxygen barrier layer material. The discharge sleeve is connected to the second conveying pipe for inputting the oxygen barrier layer raw material.

[0010] This utility model has the following beneficial effects: This invention solves the problem of uneven oxygen barrier layer thickness caused by the high surface temperature of the pipe base material during extrusion in a surface co-extrusion device, which results in high fluidity after bonding with the oxygen barrier layer. The heating pipe material is conveyed through a conveying chamber and a cooling jacket. From there, it is conveyed to a cooling jacket via another conveying port within the forming chamber, and then output to an insulation plate via the same port. Simultaneously, cooling water is conveyed to the cooling jacket via a cooling water pipe, spirally conveyed by spiral blades, and then output through a drain pipe. This process cools and shapes the heating pipe material after it passes through the cooling jacket, allowing the pipe base material to be initially cooled during extrusion in the surface co-extrusion device, resulting in poorer fluidity after bonding and preventing uneven oxygen barrier layer thickness.

[0011] This invention solves the problem of uneven forming pressure of heating pipes with oxygen barrier layers in the surface co-extrusion device by setting up a conveying chamber and a discharge sleeve. The heating pipe material is conveyed to the conveying chamber through the first conveying pipe, and then to the homogenization plate in the conveying chamber. After being homogenized through the homogenization holes, it is conveyed to the first conveying port. When the pipe enters the discharge sleeve, the second conveying pipe conveys the oxygen barrier layer raw material to the discharge sleeve. After being homogenized by the inner filter sleeve in the discharge sleeve, it is coated on the periphery of the pipe that has passed through the discharge sleeve, and then output through the second conveying port in the discharge sleeve. This makes the forming pressure of the heating pipe more uniform in the surface co-extrusion device of the heating pipe with oxygen barrier layer. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional view of the surface co-extrusion device of a novel heating pipe with an oxygen barrier layer, after partial cross-section. Figure 2 This is a three-dimensional view of the conveyor compartment after it has been partially cut open. Figure 3This is a three-dimensional view of the structure of the cooling jacket after it has been partially cut open. Figure 4 This is a three-dimensional view of the structure of the material discharge sleeve after it has been cut open. Figure 5 This is a three-dimensional view of the surface co-extrusion assembly structure of a novel heating pipe with an oxygen barrier layer.

[0014] Figure label: 1. Conveying chamber; 101. Conveying port one; 102. Mounting plate; 103. Conveying pipe one; 104. Homogenizing plate; 105. Homogenizing hole; 106. Central shaft; 2. Cooling jacket; 201. Forming sleeve; 202. Drain pipe; 203. Cooling water pipe; 204. Spiral blade; 3. Discharge sleeve; 301. Conveying port two; 302. Inner filter sleeve; 303. Conveying pipe two; 304. Insulation plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0016] Please see Figure 1-3 This utility model relates to a novel surface co-extrusion device for heating pipes with an oxygen barrier layer, comprising a conveying chamber 1, a cooling jacket 2, and a discharging sleeve 3. A forming sleeve 201 is fixed to one end of the conveying chamber 1. The conveying chamber 1 conveys the pipe material to be initially formed. The forming sleeve 201 initially forms the material input into the conveying chamber 1 into a heating pipe. A cooling jacket 2 is fixed to the end of the forming sleeve 201 away from the conveying chamber 1. The cooling jacket 2 cools the pipe material initially formed in the forming sleeve 201. A heat insulation plate 304 is fixed to the end of the cooling jacket 2 away from the forming sleeve 201. The heat insulation plate 304 provides heat insulation between the cooling jacket 2 and the discharging sleeve 3. The discharging sleeve 3 is fixed to the end of the heat insulation plate 304 away from the cooling jacket 2, discharging the material... The sleeve 3 conveys the oxygen barrier layer material to the periphery of the pre-formed heating pipe. A homogenizing disc 104 is fixed in the center of the conveying chamber 1. A central shaft 106 is fixed in the center of the homogenizing disc 104 along the central axis 106. The central shaft 106 is used for the internal forming of the heating pipe. The central shaft 106 is fixed in the conveying chamber 1. Homogenizing holes 105 are evenly opened in the homogenizing disc 104. The homogenizing disc 104 homogenizes the pipe material entering the conveying chamber 1 through the homogenizing holes 105 and then conveys it to the conveying port 101. An inner filter sleeve 302 is fixed in the discharge sleeve 3. The material entering the discharge sleeve 3 is homogenized through the inner filter sleeve 302 and then conveyed to the pre-formed heating pipe that has passed through the discharge sleeve 3.

[0017] Specifically, an installation plate 102 is fixed at the end of the conveying chamber 1 away from the forming sleeve 201, and a conveying port 101 is opened in the center of the end of the conveying chamber 1 near the forming sleeve 201. Both the cooling sleeve 2 and the forming sleeve 201 have conveying ports 101 running through them along the central axis 106. The conveying chamber 1 is installed on the external support through the installation plate 102. The conveying port 101 on the conveying chamber 1 outputs the heating pipe material entering the conveying chamber 1 to the conveying port 101 in the forming sleeve 201, and then conveys it to the conveying port 101 in the cooling sleeve 2 for the initial forming of the heating pipe.

[0018] Furthermore, the central shaft 106 passes through the conveying port 101 inside the conveying chamber 1, cooling sleeve 2 and forming sleeve 201. The periphery of the conveying chamber 1 is fixedly connected to the conveying pipe 103. The conveying pipe 103 is set between the homogenizing plate 104 and the mounting plate 102. The end of the conveying pipe 103 away from the conveying chamber 1 is fixedly connected to the feeding equipment. The raw materials for forming the heating pipe are conveyed to the conveying chamber 1 through the conveying pipe 103.

[0019] Furthermore, the cooling jacket 2 is hollow inside, and a spiral blade 204 is fixed inside the cooling jacket 2. A drain pipe 202 is fixedly connected to the edge of the cooling jacket 2 near the edge of the molding sleeve 201, and a cooling water pipe 203 is fixedly connected to the edge of the cooling jacket 2 away from the edge of the molding sleeve 201. The cooling jacket 2 uses the spiral blade 204 inside to spirally transport the cooling water entering it. The end of the cooling water pipe 203 away from the cooling jacket 2 is connected to the equipment for transporting cooling water, and the end of the drain pipe 202 away from the cooling jacket 2 is connected to the pipeline for discharging cooling water. This allows cooling water to enter the cooling jacket 2 through the cooling water pipe 203, and after being spirally transported by the spiral blade 204 inside the cooling jacket 2 to cool the heating pipe material passing through it, it is discharged through the drain pipe 202.

[0020] The operation process of this embodiment is as follows: During operation, the heating pipe material output from the conveying port 101 of the conveying chamber 1 is conveyed to the forming sleeve 201, and then conveyed to the cooling sleeve 2 through the conveying port 101 inside the forming sleeve 201. The material is then output to the heat insulation plate 304 through the conveying port 101 inside the cooling sleeve 2. At the same time, cooling water is conveyed to the cooling sleeve 2 through the cooling water pipe 203. After being conveyed by the spiral blade 204, the material is then output through the drain pipe 202, thus cooling and forming the heating pipe material that has passed through the cooling sleeve 2. Specific Implementation Example 2

[0021] Please see Figure 1-5Based on the first specific embodiment, both the discharge sleeve 3 and the heat insulation plate 304 have a second conveying port 301 that runs through the central axis 106. The central axis 106 runs through the second conveying port 301 on the discharge sleeve 3 and the heat insulation plate 304, and the oxygen barrier layer of the heating pipe is extruded and conveyed through the second conveying port 301.

[0022] Specifically, the inner diameter of the second conveying port 301 is larger than the inner diameter of the first conveying port 101, and the inner diameter of the inner filter sleeve 302 is larger than the inner diameter of the second conveying port 301. The inner filter sleeve 302 is set inside the discharge sleeve 3 outside the conveying port. The circumference of the discharge sleeve 3 is fixedly connected to the second conveying pipe 303. The end of the second conveying pipe 303 away from the discharge sleeve 3 is fixedly connected to the oxygen barrier material of the heating pipe. When the formed heating pipe is conveyed into the discharge sleeve 3, the oxygen barrier material that has been filtered and homogenized in the inner filter sleeve 302 is evenly conveyed to the circumference of the heating pipe to form the overall heating pipe.

[0023] The operation process of this embodiment is as follows: During operation, the heating pipe material is transported to the conveying chamber 1 through the conveying pipe 103, and then to the homogenization plate 104 in the conveying chamber 1. After homogenization through the homogenization hole 105, it is transported to the conveying port 101 and then to the forming sleeve 201 in the conveying port 101 in the conveying chamber 1. After preliminary forming and cooling in the conveying port 101 in the forming sleeve 201, it enters the conveying port 101 in the cooling sleeve 2 for further forming. After passing through the heat insulation plate 304, it is transported to the second conveying port 301 in the discharge sleeve 3. At the same time, the second conveying pipe 303 transports the oxygen barrier layer raw material to the discharge sleeve 3. After homogenization through the inner filter sleeve 302 in the discharge sleeve 3, it is coated on the periphery of the pipe passing through the discharge sleeve 3 and output through the second conveying port 301 in the discharge sleeve 3.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A novel surface co-extrusion device for heating pipes with oxygen barrier layer, comprising a conveying chamber (1), a cooling jacket (2), and a discharge jacket (3), characterized in that: A forming sleeve (201) is fixed at one end of the conveying chamber (1). A cooling sleeve (2) is fixed at the end of the forming sleeve (201) away from the conveying chamber (1). A heat insulation plate (304) is fixed at the end of the cooling sleeve (2) away from the forming sleeve (201). A discharge sleeve (3) is fixed at the end of the heat insulation plate (304) away from the cooling sleeve (2). A homogenizing plate (104) is fixed in the middle of the conveying chamber (1). A central axis (106) is fixed through the center of the homogenizing plate (104) along the central axis (106). The central axis (106) is fixed inside the conveying chamber (1). Homogenizing holes (105) are uniformly opened through the homogenizing plate (104). An inner filter sleeve (302) is fixed inside the discharge sleeve (3).

2. The surface co-extrusion device for a novel heating pipe with an oxygen barrier layer according to claim 1, characterized in that: The conveying chamber (1) is fixed with an installation plate (102) at one end away from the molding sleeve (201). The conveying chamber (1) is provided with a conveying port (101) at the center of one end near the molding sleeve (201). The cooling sleeve (2) and the molding sleeve (201) are both provided with a conveying port (101) along the central axis (106).

3. The surface co-extrusion device for a novel heating pipe with an oxygen barrier layer according to claim 2, characterized in that: The central shaft (106) passes through the conveying port (101) inside the conveying chamber (1), cooling sleeve (2) and forming sleeve (201). The conveying chamber (1) is fixedly connected to the periphery of the conveying pipe (103), which is located between the homogenizing plate (104) and the mounting plate (102).

4. The surface co-extrusion device for a novel heating pipe with an oxygen barrier layer according to claim 1, characterized in that: The cooling sleeve (2) is hollow inside, and a spiral blade (204) is fixed inside the cooling sleeve (2). A drain pipe (202) is fixedly connected to the edge of the cooling sleeve (2) near the molding sleeve (201), and a cooling water pipe (203) is fixedly connected to the edge of the cooling sleeve (2) away from the molding sleeve (201).

5. The surface co-extrusion device for a novel heating pipe with an oxygen barrier layer according to claim 3, characterized in that: Both the discharge sleeve (3) and the heat insulation plate (304) have a conveying port two (301) that runs through the central axis (106). The central axis (106) passes through the conveying port two (301) on the discharge sleeve (3) and the heat insulation plate (304).

6. The surface co-extrusion device for a novel heating pipe with an oxygen barrier layer according to claim 5, characterized in that: The inner diameter of the second conveying port (301) is larger than the inner diameter of the first conveying port (101), and the inner diameter of the inner filter sleeve (302) is larger than the inner diameter of the second conveying port (301). The inner filter sleeve (302) is set inside the discharge sleeve (3) outside the conveying port, and the discharge sleeve (3) is fixedly connected to the second conveying pipe (303) on its periphery.

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