A preparation process for a glass fiber reinforced pipe

Abstract

This patent application discloses a preparation process for a glass fiber reinforced pipe, which comprises the following steps: (1) extruding at least two inner pipe layers and outer pipe layers respectively with two extruders; (2) unwinding a preformed glass fiber tape and heating it to serve as a preformed glass fiber tape reinforcement layer, with the heating temperature being 150 - 220 °C; (3) compounding and extruding the inner pipe layer, the preformed glass fiber tape reinforcement layer, and the outer pipe layer to form a multi-layer composite material; (4) winding the multi-layer composite material into a spiral shape along the axial direction, and during the winding process, adjacent spiral parts are welded to each other, and then cooling and shaping are carried out. The pipes prepared by this preparation process have good integrity in the combination of multiple layers, higher pipe strength; and they save materials, are more energy-saving and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of production of engineering components or parts, and particularly relates to a preparation process for a glass fiber reinforced pipe. Background Art

[0002] A cable protection sleeve is a new type of sleeve material widely used in power engineering, and is required to have characteristics such as flame retardancy, high strength, corrosion resistance, heat resistance, insulation, long service life, smooth inner and outer walls, non-toxic and environmentally friendly, etc. It is widely used in engineering construction such as domestic and foreign power grid construction and renovation, municipal roads, traffic road bridges and civil aviation airports.

[0003] At present, plastic pipes such as cable protection sleeves and other similar applications are mainly formed by the extrusion molding method. Extrusion molding is a main molding method for plastic products. When preparing a pipe by the extrusion molding method, the raw material in a molten state is formed into a pipe blank under the action of an extruder, and the pipe blank is cooled to be shaped. However, when preparing a multi-layer pipe by the above existing method, the integrity of the combination between the multi-layers of the pipe formed by directly extruding to form the pipe blank is not good, and the strength is not high. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a preparation process for a glass fiber reinforced pipe. The pipes prepared by this preparation process have good integrity in the combination between the multi-layers, higher pipe strength; and save materials, and are more energy-saving and environmentally friendly.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A preparation process for a glass fiber reinforced pipe, comprising the following steps:

[0007] (1) At least two extruders are used to extrude the inner layer and the outer layer of the pipe respectively;

[0008] (2) Unroll a preformed glass fiber tape and heat it as a preformed glass fiber tape reinforcement layer, and the heating temperature is 150 - 220 °C;

[0009] (3) The inner layer of the pipe, the preformed glass fiber tape reinforcement layer, and the outer layer of the pipe are compounded and extruded to form a multi-layer composite material;

[0010] (4) The multi-layer composite material is wound and formed in a spiral shape along the axial direction. During the winding process, adjacent parts of the spiral shape are welded to each other, and then cooled and shaped.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. In the solution of the present invention, the inner layer of the pipe, the preformed glass fiber tape reinforced layer, and the outer layer of the pipe are first compounded and extruded to form a multi-layer composite material, and then wound and formed. The inner layer of the pipe, the preformed glass fiber tape reinforced layer, and the outer layer of the pipe can be completely compounded together, with higher overall strength. When the pipe reaches the same strength, more than 20% of the materials can be reduced, which is more energy-saving and environmentally friendly.

[0013] 2. The inventor of the present invention found that when using the preformed glass fiber tape as the reinforcing layer material of the pipe, the strength of the produced pipe is significantly increased. By heating the preformed glass fiber tape to 150-220 °C and using it as the preformed glass fiber tape reinforced layer, the preformed glass fiber tape reinforced layer is welded and compounded with the inner layer of the pipe and the outer layer of the pipe respectively, which can make the preformed glass fiber tape reinforced layer more evenly distributed between the inner layer of the pipe and the outer layer of the pipe, and further make the overall strength of the prepared pipe stronger.

[0014] As a preferred embodiment of the present invention, in step (4), the pitch of the spiral formed by winding and forming is less than or equal to 10 cm. With this setting, the force is more dispersed between adjacent parts of the spiral, and the strength of the formed pipe is higher.

[0015] As a preferred embodiment of the present invention, in step (2), multiple unwinding rollers are used to unwind the preformed glass fiber tape, and one or more unwinding rollers are selected to unwind together according to the thickness requirement of the preformed glass fiber tape layer. During the production process, for pipes with different application requirements, the thickness of the preformed glass fiber tape reinforced layer needs to be adjusted. In this solution, one or more unwinding rollers can be selected to unwind the preformed glass fiber tape simultaneously according to the thickness requirement of the preformed glass fiber tape reinforced layer, and the operation of adjusting the thickness of the preformed glass fiber tape reinforced layer is very convenient and fast.

[0016] As a preferred embodiment of the present invention, in step (2), spare unwinding rollers corresponding to the multiple unwinding rollers are also configured, and the spare unwinding rollers are enabled when the unwinding roller has unwound the preformed glass fiber tape and needs to be switched or when a failure occurs during unwinding. Configuring spare unwinding rollers can quickly enable the preformed glass fiber tape material on the spare unwinding rollers when needed, without affecting the production progress and improving the production efficiency.

[0017] As a preferred embodiment of the present invention, a multi-layer coated winding pipe production device is used for preparation, including:

[0018] A forming part, the forming part includes a machine base and at least two extruders, a heating source, an extrusion unit, and a winding and forming roller located on the machine base;

[0019] An unwinding part, the unwinding part includes a frame and multiple unwinding rollers located on the frame, which are used for unwinding one or more layers of preformed glass fiber tape of the winding pipe;

[0020] The heating source is used to heat the preformed glass fiber tape released by the unwinding roller;

[0021] The extrusion unit includes at least two relatively arranged extrusion rollers. The extrusion rollers are used to extrude the pipe layer extruded by the extruder and the preformed glass fiber tape released and heated by the unwinding roller. The winding and forming roller is used to wind and form the extruded multi-layer material.

[0022] The beneficial effects of the multi-layer coated and wound pipe production equipment adopting this solution are as follows:

[0023] 1. In this solution, at least two extruders are used to extrude the inner pipe layer and the outer pipe layer. The preformed glass fiber tape is unwound by the unwinding roller. After the preformed glass fiber tape is heated by the heating source, it is extruded and fused with the inner pipe layer and the outer pipe layer extruded by the extruder by the extrusion rollers of the extrusion unit, and finally wound and formed on the winding and forming roller. The equipment with this structure in this solution can fully fuse the inner pipe layer, the preformed glass fiber tape reinforcement layer, and the outer pipe layer, and the integrity of the combination between the multiple layers of the pipeline is better, and the strength of the manufactured pipeline is higher.

[0024] 2. The unwinding part is provided with multiple unwinding rollers. During the production process, according to the thickness requirement of the preformed glass fiber tape reinforcement layer, one or more unwinding rollers can be selected to unwind the preformed glass fiber tape material at the same time, and the adjustment operation of the thickness of the preformed glass fiber tape reinforcement layer is very convenient and fast.

[0025] A roller pressing mechanism for roller pressing the surface of the winding part is provided on one side of the machine base where the winding and forming roller is located. Through the roller pressing mechanism, the surface of the winding part can be roller pressed, so that the inner pipe layer, the preformed glass fiber tape reinforcement layer, and the outer pipe layer and the adjacent winding parts are better welded, and the integrity of the pipeline is better.

[0026] As a preferred embodiment of the present invention, the roller pressing mechanism includes a mounting seat, an adjusting rod, and a pressing roller. The adjusting rod is slidably connected to the mounting seat, and the mounting seat is provided with an adjusting rod locking structure. The pressing roller is rotatably connected to one end of the adjusting rod. According to the different wall thicknesses of the pipeline, the position of the adjusting rod can be adjusted so that the pressing roller applies appropriate pressure to the part where the pipeline is wound and formed.

[0027] As a preferred embodiment of the present invention, an arc-shaped cover plate covering the outside of the pressure roller is further provided on the roller pressing mechanism, and the length of the arc-shaped cover plate along the axial direction of the pressure roller is the same as the length of the pressure roller. A first cavity is provided inside the arc-shaped cover plate, and the first cavity is communicated with the coolant through a pipeline. A strip-shaped water outlet slit communicated with the cooling cavity is opened on one side of the arc-shaped cover plate along the axial direction of the pressure roller, and the water outlet direction of the strip-shaped water outlet slit is tangent to the surface of the pressure roller. During the manufacturing process of the pipeline, multiple layers of materials are wound around the forming roller, and the pressure roller applies pressure outside the pipeline. Before the pipeline is completely formed, adhesion will occur between the pipeline and the surface of the pressure roller. By introducing cooling water into the first cavity and flowing out through the strip-shaped water outlet slit, and the water outlet direction of the strip-shaped water outlet slit is tangent to the surface of the pressure roller, so a layer of cooling water is formed on the surface of the pressure roller. During the process of the pressure roller rolling the surface of the pipeline, the problem of adhesion can be effectively alleviated.

[0028] As a preferred embodiment of the present invention, the middle parts of both sides of the arc-shaped cover plate perpendicular to the axial direction of the pressure roller are rotatably connected to the adjusting rods;

[0029] A second cavity is further provided inside the arc-shaped cover plate. The second cavity is communicated with a heat source through a pipeline. The other side of the arc-shaped cover plate along the axial direction of the pressure roller is provided with a scraper that can be attached to the surface of the pressure roller, and a row of heating holes is opened on this side;

[0030] An adjusting structure is further provided, including a tension spring and a locking member. One end of the tension spring is connected to the outer surface of the arc-shaped cover plate away from the pressure roller, and the other end is connected to the mounting seat. The tension spring can pull the arc-shaped cover plate to rotate so that the scraper fits the surface of the pressure roller; the locking member can lock the arc-shaped cover plate at a position close to the surface of the pressure roller where the strip-shaped water outlet slit is located.

[0031] After being used for a long time, it is inevitable that pipeline materials will adhere to the surface of the pressure roller. In this solution, the locking member is loosened, and the arc-shaped cover plate is pulled by the tension spring to rotate so that the scraper fits the surface of the pressure roller. At the same time, a heat source such as hot water or hot steam is introduced into the second cavity and discharged through a row of heating holes to heat the adhered substances on the surface of the pressure roller. The scraper on one side of the arc-shaped cover plate can remove the adhered substances on the surface of the pressure roller, and cleaning can be carried out during the production process. It can be seen that adopting this solution does not require cleaning after removing the components, and the treatment is convenient and fast.

[0032] As a preferred embodiment of the present invention, the locking member is a locking hook, and the locking hook is connected to the adjusting rod through a torsion spring. A hook groove for the locking hook to be inserted into is provided on the outer surface of the arc-shaped cover plate away from the pressure roller. The locking member with the above structure is simple in structure and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a pipeline prepared by an embodiment of a preparation process of a glass fiber reinforced pipe of the present invention;

[0034] Figure 2It is another structural schematic diagram of the pipeline in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention;

[0035] Figure 3 is Figure 2 a sectional view along the A-A direction;

[0036] Figure 4 It is a structural schematic diagram of the production equipment in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the roller pressing mechanism in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the roller pressing mechanism in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention

[0039] Figure 7 It is a structural schematic diagram of the roller pressing mechanism in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention

[0040] Figure 8 It is a structural schematic diagram of the roller pressing mechanism in the embodiment of the preparation process of the glass fiber reinforced pipe of the present invention.

[0041] The reference numerals include: inner layer of the pipe 1, preformed glass fiber tape reinforced layer 2, outer layer of the pipe 3, machine base 4, extruder 5, heat source 6, extrusion roller 7, frame 8, winding forming roller 9, unwinding roller 10, spare unwinding roller 11, mounting seat 12, adjusting rod 13, lead screw structure 131, nut 132, sliding groove 133, pressing roller 14, arc-shaped cover plate 15, first cavity 151, strip-shaped water outlet slit 152, second cavity 153, heating hole 154, scraper 155, pipeline 156, adjusting structure 16, tension spring 161, locking hook 162, hook groove 163. Detailed implementation manners

[0042] The typical implementation manners reflecting the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various changes in different implementation manners, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0043] In the following embodiments, the preformed glass fiber tape is a glass fiber tape formed by pre-weaving glass fibers, and the single-layer thickness is preferably between 0.2 - 0.5 mm, and there are also some with thicknesses outside the above range.

[0044] The embodiment is basically as shown in Figure 1 , Figure 4 and Figure 5 shown: A preparation process of a glass fiber reinforced pipe includes the following steps:

[0045] (1) Two extruders 5 are respectively used to extrude the inner layer 1 of the pipe and the outer layer 3 of the pipe;

[0046] (2) Unroll the preformed fiberglass tape and heat it as the preformed fiberglass tape reinforcing layer 2, and the heating temperature is 150 - 220 °C;

[0047] (3) Compound and extrude the inner layer 1 of the pipe, the preformed fiberglass tape reinforcing layer 2, and the outer layer 3 of the pipe to form a multi-layer composite material;

[0048] (4) Wind and form the multi-layer composite material in a spiral shape along the axial direction. During the winding process, adjacent parts of the spiral shape are welded to each other, as shown in Figure 2 and 3 shown. The pitch of the spiral shape formed by the winding and forming is D, and D is less than or equal to 10 cm. Then, it is cooled and shaped.

[0049] In step (2), multiple unwinding rollers 10 are used to unwind the preformed fiberglass tape. According to the thickness requirement of the preformed fiberglass tape reinforcing layer, one or more unwinding rollers 10 are selected to unwind together to quickly adjust the thickness of the preformed fiberglass tape reinforcing layer. In addition, spare unwinding rollers 11 corresponding to the multiple unwinding rollers 10 are also configured. When the unwinding roller 10 finishes unwinding the preformed fiberglass tape and needs to be switched or a fault occurs during unwinding, the spare unwinding roller 11 is enabled to quickly connect.

[0050] As shown in Figure 4 and Figure 5 shown, the above preparation process is carried out by using a multi-layer coated and wound pipe production device, including:

[0051] A forming part, the forming part includes a machine base 4 and two extruders 5, a heating source 6, an extrusion unit, and a winding and forming roller 9 located on the machine base 4.

[0052] An unwinding part, the unwinding part includes a frame 8 and multiple unwinding rollers 10 located on the frame 8, which are used for unwinding one or more layers of preformed fiberglass tape for winding the pipe. The multiple unwinding rollers 10 are arranged in rows vertically. In the figure, the situation of arranging two rows of unwinding rollers 10, with 5 unwinding rollers 10 in each row, is shown. The number of rows of the unwinding rollers 10 and the number in each row can be increased or decreased according to the usage situation.

[0053] In some embodiments, the frame 8 is also rotatably connected with spare unwinding rollers 11 arranged in rows vertically, and the spare unwinding rollers 11 are arranged on one side of the unwinding rollers 10.

[0054] The heating source 6 is used to heat the preformed fiberglass tape unwound by the unwinding roller 10. The heating source 6 can use existing industrial hot air blowers, continuous heating boxes (such as electric heating, heat transfer oil heating, fuel heating, etc. are set in the heating box).

[0055] The extrusion unit includes at least two extrusion rollers 7 arranged oppositely. The extrusion rollers 7 are used to extrude the inner layer 1 of the pipe extruded by the extruder 5, the preformed fiberglass tape that is unwound and heated by the unwinding roller 10, and the outer layer 3 of the pipe. The distance between the two extrusion rollers 7 is adjustable to suit the production of pipes with different wall thicknesses. The structure of such adjustment can adopt common existing technologies. In some embodiments, multiple pairs of oppositely arranged extrusion rollers 7 can also be provided. The winding and forming roller 9 is used to wind and form the multilayer material after extrusion.

[0056] On one side of the winding and forming roller 9, the machine base 4 is provided with a rolling mechanism for rolling the surface of the winding part, such as Figure 5 As shown, the rolling mechanism includes a mounting seat 12, an adjusting rod 13, and a pressing roller 14. The adjusting rod 13 is slidably connected to the mounting seat 12 through a chute 133 and a slide rail. The mounting seat 12 is provided with an adjusting rod locking structure. The pressing roller 14 is rotatably connected to one end of the adjusting rod 13. In this embodiment, the locking structure is a nut 132 and a lead screw structure 131. One end of the adjusting rod 13 is a lead screw structure 131, and a nut 132 that is threadedly engaged with the adjusting rod 13 is rotatably connected to the mounting seat 12.

[0057] The usage process of the above equipment:

[0058] Use the two extruders 5 in the forming part to extrude the inner layer 1 of the pipe and the outer layer 3 of the pipe respectively;

[0059] According to the thickness of the preformed fiberglass tape reinforcement layer 2 required for pipes with different wall thicknesses, determine the number of unwinding rollers 10 in the unwinding part to be enabled. Use the unwinding rollers 10 to unwind the preformed fiberglass tape, and heat it through the heating source 6 as the preformed fiberglass tape reinforcement layer 2. The heating temperature is 150 - 220 °C;

[0060] Extrude and weld the inner layer 1 of the pipe, the preformed fiberglass tape reinforcement layer 2, and the outer layer 3 of the pipe through the extrusion rollers 7 of the extrusion unit to form a multilayer composite material;

[0061] Wind and form the multilayer composite material on the winding and forming roller 9.

[0062] In some other embodiments, such as Figure 6 , Figure 7 As shown, the rolling mechanism further includes an arc-shaped cover plate 15 covering the pressing roller 14, and the length of the arc-shaped cover plate 15 along the axial direction of the pressing roller 14 is the same as the length of the pressing roller 14. A first cavity 151 is provided inside the arc-shaped cover plate 15. The first cavity 151 is connected to the coolant through a pipe 156. A strip-shaped water outlet slot 152 communicating with the cooling cavity is opened on one side of the arc-shaped cover plate 15 along the axial direction of the pressing roller 14, and the water outlet direction of the strip-shaped water outlet slot 152 is tangent to the surface of the pressing roller 14.

[0063] During the pipeline manufacturing process, multiple layers of materials are wound around the winding forming roller 9, and the pressure roller 14 applies pressure outside the pipeline. Since the pipeline is not fully formed yet, adhesion will occur between it and the surface of the pressure roller 14. Cooling water is introduced into the first cavity 151 through the pipeline 156 by an external water pump and flows out through the strip-shaped water outlet slit 152. The water outlet direction of the strip-shaped water outlet slit 152 is tangent to the surface of the pressure roller 14. Therefore, a layer of cooling water is formed on the surface of the pressure roller 14, which can effectively alleviate the adhesion problem during the process of the pressure roller 14 rolling the pipeline surface.

[0064] In some other embodiments, such as Figure 6 , Figure 7 and Figure 8 shown, the two middle parts of the arc-shaped cover plate 15 perpendicular to the axial direction of the pressure roller 14 are rotatably connected to the adjusting rod 13; a second cavity 153 is also provided inside the arc-shaped cover plate 15, and the second cavity 153 is communicated with a heat source through the pipeline 156. The other side of the arc-shaped cover plate 15 along the axial direction of the pressure roller 14 is provided with a scraper 155 that can fit the surface of the pressure roller 14, and a row of heating holes 154 are opened on this side;

[0065] An adjusting structure 16 is also provided, including a tension spring 161 and a locking member. One end of the tension spring 161 is connected to the outer surface of the arc-shaped cover plate 15 away from the pressure roller 14, and the other end is connected to the mounting seat 12. The tension spring 161 can pull the arc-shaped cover plate 15 to rotate so that the scraper 155 fits the surface of the pressure roller 14; the locking member is a locking hook 162, and the locking hook 162 is connected to the adjusting rod 13 through a torsion spring. A hook groove 163 for the locking hook 162 to engage is provided on the outer surface of the arc-shaped cover plate 15 away from the pressure roller 14, and the locking member can lock the arc-shaped cover plate 15 at a position close to the surface of the strip-shaped water outlet slit 152 and the pressure roller 14.

[0066] After being used for a long time, it is inevitable that pipeline materials will adhere to the surface of the pressure roller 14. In this solution, the locking member is loosened. Specifically, a force is applied to the arc-shaped cover plate 15 on the side towards the strip-shaped water outlet slit 152, and at the same time, the locking hook 162 is pulled so that the locking hook 162 disengages from the hook groove 163 of the arc-shaped cover plate 15. Then, the force applied to the arc-shaped cover plate 15 is released, and the tension spring 161 will pull the arc-shaped cover plate 15 to rotate so that the scraper 155 fits the surface of the pressure roller 14. At the same time, a heat source such as hot water or hot steam is introduced into the second cavity 153 and discharged through a row of heating holes 154 on one side of the arc-shaped cover plate 15 to heat the adhered substances on the surface of the pressure roller 14. The scraper 155 on one side of the arc-shaped cover plate 15 can then remove the adhered substances on the surface of the pressure roller 14, and cleaning can be carried out during the production process. With this solution, there is no need to disassemble the components for cleaning, and the treatment is convenient and fast.

[0067] The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. A preparation process of a glass fiber reinforced pipe, characterized in that, It includes the following steps: (1) Extrude the inner layer and outer layer of the pipe respectively with at least two extruders; (2) Unwind the preformed fiberglass tape and heat it as the preformed fiberglass tape reinforcement layer, and the heating temperature is 150 - 220 °C; (3) Compound and extrude the inner layer of the pipe, the preformed fiberglass tape reinforcement layer, and the outer layer of the pipe to form a multi-layer composite material; (4) Wind and form the multi-layer composite material in a spiral shape along the axial direction. During the winding process, adjacent parts of the spiral shape are welded to each other, and then cooled and shaped; It is prepared by using a multi-layer coated and wound pipe production device. The multi-layer coated and wound pipe production device includes a forming part. The forming part includes a machine base and at least two extruders, a heating source, an extrusion unit, and a winding and forming roller located on the machine base; The machine base is provided with a rolling mechanism for rolling the surface of the winding part on one side of the winding and forming roller. The rolling mechanism includes a mounting seat, an adjusting rod, and a pressing roller. The adjusting rod is slidably connected to the mounting seat. The mounting seat is provided with an adjusting rod locking structure. The pressing roller is rotatably connected to one end of the adjusting rod. The rolling mechanism is also provided with an arc-shaped cover plate covering the pressing roller, and the length of the arc-shaped cover plate along the axial direction of the pressing roller is the same as the length of the pressing roller. A first cavity is arranged inside the arc-shaped cover plate. The first cavity is connected to the coolant through a pipeline. A strip-shaped water outlet slit communicating with the cooling cavity is arranged on one side of the arc-shaped cover plate along the axial direction of the pressing roller, and the water outlet direction of the strip-shaped water outlet slit is tangent to the surface of the pressing roller.

2. The preparation process of a glass fiber reinforced pipe according to claim 1, characterized in that: In step (4), the pitch of the spiral shape formed by winding and forming is less than or equal to 10 cm.

3. The preparation process of a glass fiber reinforced tube according to claim 1, characterized in that: In step (2), multiple unwinding rollers are used to unwind the preformed fiberglass tape, and one or more unwinding rollers are selected to unwind together according to the thickness requirement of the preformed fiberglass tape layer.

4. A preparation process of a glass fiber reinforced tube according to claim 3, characterized in that: In step (2), spare unwinding rollers corresponding to the multiple unwinding rollers are also configured, and the spare unwinding rollers are enabled when the unwinding roller finishes unwinding the preformed fiberglass tape and needs to be switched or when a fault occurs during unwinding.

5. The preparation process of a glass fiber reinforced tube according to claim 3, characterized in that, The multi-layer coated and wound pipe production device further includes: An unwinding part, which includes a frame and multiple unwinding rollers located on the frame, and is used for unwinding one or more layers of preformed fiberglass tape for the winding pipe; The heating source is used to heat the preformed fiberglass tape unwound by the unwinding roller; The extrusion unit includes at least two extrusion rollers arranged oppositely. The extrusion rollers are used to extrude the pipe layer extruded by the extruder and the preformed fiberglass tape unwound by the unwinding roller and heated. The winding and forming roller is used to wind and form the extruded multi-layer material.

6. A preparation process of a glass fiber reinforced tube according to claim 5, characterized in that: The two middle parts of the arc-shaped cover plate perpendicular to the axial direction of the pressing roller are rotatably connected to the adjusting rod; A second cavity is also arranged inside the arc-shaped cover plate. The second cavity is connected to a heat source through a pipeline. The other side of the arc-shaped cover plate along the axial direction of the pressing roller is set as a scraper that can be attached to the surface of the pressing roller, and a row of heating holes is arranged on this side; An adjusting structure is also provided, including a tension spring and a locking part. One end of the tension spring is connected to the outer surface of the arc-shaped cover plate far from the pressing roller, and the other end is connected to the mounting seat. The tension spring can pull the arc-shaped cover plate to rotate so that the scraper is attached to the surface of the pressing roller; the locking part can lock the arc-shaped cover plate at the position close to the surface of the pressing roller and the strip-shaped water outlet slit.

7. A preparation process of a glass fiber reinforced tube according to claim 6, characterized in that: The locking member is a locking hook, and the locking hook is connected to the adjusting rod through a torsion spring. A hook groove for the locking hook to snap into is provided on the outer surface of the arc-shaped cover plate on the side away from the pressure roller.

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