Drainage type electric power pipe production process

Abstract

The invention relates to the technical field of electric power pipes, in particular to a drainage type electric power pipe production process which comprises the following specific steps: S1, mixing and melting raw materials of an inner pipe 3, extruding into a pipe making machine through an extruder, and shaping and cooling to obtain the inner pipe 3; s2, a drainage hole 301 is machined in the pipe wall of the inner pipe 3; s3, mixing and melting the raw materials of the outer pipe 1, extruding into a pipe making machine through an extruder, and shaping and cooling to obtain the outer pipe 1; s4, the inner pipe 3 and the outer pipe 1 are cut to the same length and fixed in a mold; and S5, filling a buffer layer 2 between the inner pipe 3 and the outer pipe 1 to obtain the drainage type electric power pipe. The power pipe comprises an inner pipe 3 and an outer pipe 1 which are both MPP pipes, and the manufactured power pipe is an MPP composite pipe, is good in cable protection effect and impact resistance, has the drainage capacity and can drain water in the power pipe.

Description

Technical Field

[0001] The invention relates to the technical field of electric power pipes, and in particular to a production process for drainage-type electric power pipes. Background Art

[0002] The power pipe is a protective pipe that is installed outside the cable when the cable is laid. It is usually laid in an underground foundation pit. It has excellent corrosion resistance and good electrical insulation. It will not produce electrical corrosion and is a safety protection pipe that blocks all harsh external environments from harming the cables. However, it generally does not have drainage capabilities. If water seeps into the interior, it is easy to corrode the power cable, which may affect the use of the power cable.

[0003] Therefore, it is necessary to design an electric pipe with drainage function. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a drainage type power pipe production process, which has a drainage function, while improving the impact resistance and reducing the situation of pipe rupture and water ingress.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A drainage type power pipe production process, the specific steps are as follows: Step S1, mixing and melting the raw materials of the inner tube, and extruding the raw materials into a tube making machine through an extruder for shaping and cooling to obtain the inner tube; Step S2, processing a drainage hole on the wall of the inner tube; Step S3, mixing and melting the raw materials of the outer tube, and extruding them into a tube making machine through an extruder for shaping and cooling to obtain the outer tube; Step S4, cutting the inner tube and the outer tube to the same length and fixing them in the mold; Step S5, filling a buffer layer between the inner tube and the outer tube to obtain a drainage type power tube.

[0006] Optionally, in one embodiment of the present invention, the raw materials of the outer tube in step S3 include polypropylene powder, stabilizer, lubricant, antioxidant, impact modifier, solubilizer and plasticizer, and the weight ratio of the polypropylene powder to the impact modifier is 9-10:0.5-1.

[0007] Optionally, in one embodiment of the present invention, the raw materials of the inner tube in step S1 include polypropylene powder, stabilizer, lubricant, antioxidant, EPDM rubber, solubilizer and plasticizer, and the weight ratio of the polypropylene powder to the EPDM rubber is 7-8:1-1.5.

[0008] Optionally, in one embodiment of the present invention, the buffer layer in step S4 is made of foamed polypropylene material.

[0009] Optionally, in one embodiment of the present invention, the impact modifier is POE pellets.

[0010] Optionally, in one embodiment of the present invention, the drainage hole is opened around the tube wall of the inner tube, and the hole diameter of the drainage hole is 5 mm.

[0011] Optionally, in one embodiment of the present invention, a plurality of cavities are provided between the inner wall of the buffer layer and the outer wall of the inner tube, the cavities are arranged around the outer wall of the inner tube, the inner wall of the buffer layer is provided with a plurality of connecting parts connected to the outer wall of the inner tube, the connecting parts are arranged between two of the cavities, and the connecting parts are non-continuous structures.

[0012] Optionally, in one embodiment of the present invention, a water-absorbing material is contained in the cavity.

[0013] Optionally, in an embodiment of the present invention, after the step S2 is completed, the following steps are required: A hydrophobic coating is applied to the inner wall of the inner tube.

[0014] Optionally, in an embodiment of the present invention, after the step S5 is completed, the following steps are further included: A polyetheretherketone coating is applied to the outer wall of the outer tube.

[0015] Beneficial effects of the present invention The drainage type electric power pipe production process of the present invention has the following advantages over the prior art: the pipe itself is a composite pipe with higher structural strength; the pipe includes an outer pipe and an inner pipe, both of which are toughened and modified MPP pipes with higher impact resistance; a foamed polypropylene is provided between the outer pipe and the inner pipe as a buffer layer, which can reduce the impact force on the inner pipe and reduce the occurrence of rupture; a cavity is provided between the inner pipe and the buffer layer for accommodating water-absorbing material, and a drainage hole is opened on the wall of the inner pipe to connect to the cavity, so as to discharge water that has penetrated into the inner pipe, thereby reducing the possibility of corrosion failure of the power cable and maintaining the stable use of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the production process of the drainage type power pipe according to Example 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a drainage type power pipe according to Embodiment 1 of the present invention; Reference numerals: outer tube 1 , buffer layer 2 , connection portion 201 , inner tube 3 , drainage hole 301 , polyurethane sponge 4 . Implementation

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. Example

[0025] Existing power pipes generally do not have drainage capabilities. In order to reduce the occurrence of water seepage, it is necessary to improve the impact resistance of the pipe. A drainage power pipe production process is designed for the production of such pipes. The specific plan is as follows: A drainage type power pipe production process, the specific steps are as follows: Step S1, mixing and melting the raw materials of the inner tube 3, extruding the raw materials into a tube making machine through an extruder for shaping and cooling, and obtaining the inner tube 3; The raw materials of the inner tube 3 in step S1 include polypropylene powder, stabilizer, lubricant, antioxidant, EPDM rubber, solubilizer and plasticizer. The weight ratio of polypropylene powder to EPDM rubber is 7-8:1-1.5. The proportions of the various materials in the raw materials of the inner tube 3 are: 70% polypropylene powder, 10% EPDM rubber, 5% stabilizer, 3% lubricant, 3% antioxidant, 5% solubilizer and 4% plasticizer.

[0026] The raw materials of the inner tube 3 are melted and then fully mixed and stirred, and then the mixed materials are put into a twin-screw extruder for extrusion, and are shaped and cooled in a tube making machine, and the cooling is carried out by spraying water cooling.

[0027] By modifying polypropylene through EPDM rubber, the material's low-temperature resistance can reach -40°C, and the material's toughness can be increased, making it more impact-resistant. The low-temperature performance makes the pipe more applicable in a wider range of regions.

[0028] Step S2, processing a drainage hole 301 on the wall of the inner tube 3; The drainage holes 301 are arranged around the tube wall of the inner tube 3. In the present embodiment, the diameter of the drainage holes 301 is 5 mm, and the front-to-back distance between the two drainage holes 301 is set to 30 cm.

[0029] After step S2 is completed, the following steps are required: A hydrophobic coating is applied to the inner wall of the inner tube 3 so that water that penetrates into the inner tube 3 can quickly flow to the drainage hole 301 to speed up drainage. The hydrophobic coating can be applied by spraying with a sprayer, and the inner wall of the drainage hole 301 is also coated.

[0030] Step S3, mixing and melting the raw materials of the outer tube 1, and extruding the raw materials into a tube making machine through an extruder for shaping and cooling to obtain the outer tube 1; The raw materials of the outer tube 1 in step S3 include polypropylene powder, stabilizer, lubricant, antioxidant, impact modifier, solubilizer and plasticizer. The weight ratio of polypropylene powder to impact modifier is 9-10:0.5-1. In this embodiment, the proportion of each material in the raw materials of the outer tube 1 is 80%, the impact modifier is 8%, the stabilizer is 3%, the lubricant is 2%, the antioxidant is 2%, the solubilizer is 3%, and the plasticizer is 2%.

[0031] Step S4, cutting the inner tube 3 and the outer tube 1 to the same length and fixing them in the mold; The mold is designed according to the structure of the power pipe, and the protruding structure is designed to ensure that when the buffer layer 2 is filled, the designed position of the cavity is avoided. Step S5, filling the buffer layer 2 between the inner tube 3 and the outer tube 1 to obtain a drainage type power tube.

[0032] The buffer layer 2 in step S4 is made of foamed polypropylene material.

[0033] The impact modifier is POE granules, which are used to modify the material of the outer tube 1 and can also improve the cold resistance and impact resistance of the material.

[0034] There are multiple cavities between the inner wall of the buffer layer 2 and the outer wall of the inner tube 3. The cavities are arranged around the outer wall of the inner tube 3. The inner wall of the buffer layer 2 is provided with multiple connecting parts 201 connected to the outer wall of the inner tube 3. The connecting part 201 is arranged between two cavities, and the connecting part 201 is a discontinuous structure.

[0035] In this embodiment, six cavities are provided between the inner wall of the buffer layer 2 and the outer wall of the inner tube 3. The six cavities are of the same size and divide the tube wall of the inner tube 3 into six arc sections. To ensure the best drainage effect, the drainage hole 301 is opened at the top of each arc section.

[0036] The cavity is lined with water-absorbing material.

[0037] Specifically, in this embodiment, the water-absorbing material is a polyurethane sponge 4 and is a high-density sponge, which can absorb the seepage of the inner tube 3 to minimize the accumulation of the seepage, and can speed up drying. Compared with ordinary sponges, it has higher elasticity, can provide a buffer for the cavity position, and provide a certain structural strength.

[0038] After step S5 is completed, the following steps are also included: In this embodiment, a polyetheretherketone coating is coated on the outer wall of the outer tube 1 to improve the wear resistance of the outer tube 1 and reduce the occurrence of damage to the outer tube 1. In addition, polyetheretherketone has high strength, high toughness and high heat resistance, so that the power pipe can be used in high temperature, corrosive and humid environments. Example

[0039] In this embodiment, the structure of the power tube is basically the same as the structure in Example 1, with the difference that a limiting structure is provided inside the inner tube 3, and the power cable is installed on the limiting structure. The limiting structure is mainly used to prevent the surface of the power cable from contacting the inner wall of the inner tube 3, thereby preventing the power cable from clogging the drainage hole 301 and hindering drainage. In this solution, the limiting structure and the inner tube 3 are an integrated structure, and the overall shape of the limiting structure is a star-shaped structure. A cable installation area is provided on the limiting structure, and each installation area corresponds to a cavity, and each installation area is connected to each other to facilitate drainage. Example

[0040] In this embodiment, the structure of the power pipe is basically the same as that in Embodiment 1, with the difference that, on the downward side of the power pipe, connected drainage holes 301 are provided in the buffer layer 2 and the outer pipe 1, and a block is provided at the position of the drainage hole 301 of the outer pipe 1, so that the water in the inner pipe 3 can be directly discharged into the ground.

[0041] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0042] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A drainage type power pipe production process, characterized in that: The specific steps are as follows: Step S1, mixing and melting the raw materials of the inner tube, and extruding the raw materials into a tube making machine through an extruder for shaping and cooling to obtain the inner tube; Step S2, processing a drainage hole on the wall of the inner tube; Step S3, mixing and melting the raw materials of the outer tube, and extruding them into a tube making machine through an extruder for shaping and cooling to obtain the outer tube; Step S4, cutting the inner tube and the outer tube to the same length and fixing them in the mold; Step S5, filling a buffer layer between the inner tube and the outer tube to obtain a drainage type power tube.

2. The drainage type power pipe production process according to claim 1, characterized in that: The raw materials of the outer tube in step S3 include polypropylene powder, stabilizer, lubricant, antioxidant, impact modifier, solubilizer and plasticizer, and the weight ratio of the polypropylene powder to the impact modifier is 9-10:0.5-1.

3. The drainage type power pipe production process according to claim 1, characterized in that: The raw materials of the inner tube in step S1 include polypropylene powder, stabilizer, lubricant, antioxidant, EPDM rubber, solubilizer and plasticizer, and the weight ratio of the polypropylene powder to the EPDM rubber is 7-8:1-1.

5.

4. The drainage type power pipe production process according to claim 1, characterized in that: The buffer layer in step S4 is made of foamed polypropylene material.

5. The drainage type power pipe production process according to claim 2, characterized in that: The impact modifier is POE pellets.

6. The drainage type power pipe production process according to claim 1, characterized in that: The drainage hole is arranged around the tube wall of the inner tube, and the hole diameter of the drainage hole is 5 mm.

7. The drainage type power pipe production process according to claim 1, characterized in that: A plurality of cavities are provided between the inner wall of the buffer layer and the outer wall of the inner tube, and the cavities are arranged around the outer wall of the inner tube. A plurality of connecting parts are provided on the inner wall of the buffer layer and connected to the outer wall of the inner tube, and the connecting part is arranged between two of the cavities, and the connecting part is a discontinuous structure.

8. The drainage type power pipe production process according to claim 7, characterized in that: The cavity is filled with water-absorbing material.

9. The drainage type power pipe production process according to claim 2, characterized in that: After step S2 is completed, the following steps are required: A hydrophobic coating is applied to the inner wall of the inner tube.

10. The drainage type power pipe production process according to claim 1, characterized in that: After the step S5 is completed, the following steps are also included: A polyetheretherketone coating is applied to the outer wall of the outer tube.

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