Novel 3PE steel pipe anti-corrosion equipment

Abstract

The utility model provides novel 3PE steel pipe anti-corrosion equipment, and relates to the technical field of anti-corrosion. The novel 3PE steel pipe anti-corrosion equipment comprises a winding chamber, a double-layer co-extrusion die, a first extrusion device, a second extrusion device and a pressing wheel, the double-layer co-extrusion die is connected with the winding chamber, and the double-layer co-extrusion die is provided with a convergence channel communicating with an inner cavity of the winding chamber; the first extrusion device and the second extrusion device are both connected with the double-layer co-extrusion die, and materials extruded by the first extrusion device and materials extruded by the second extrusion device can be bonded in the convergence channel and then enter the winding chamber; the pressing wheel is installed in the inner cavity and used for being driven by the steel pipe to rotate. The equipment is compact in structure, the overall size is reduced, and the space required for assembly is reduced; procedures can be saved, time is shortened, machining efficiency is improved, and cost is reduced; meanwhile, an adhesive layer is not prone to adhering to the pressing wheel, the pressing wheel cleaning difficulty is lowered, time and labor are saved, and the winding quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-corrosion, and in particular to a novel 3PE steel pipe anti-corrosion device. Background Art

[0002] At present, anti-corrosion steel pipes are mostly used in more important occasions, especially in petroleum, chemical industry, natural gas, thermal energy, water conservancy, roads, bridges and water conservancy. By coating the outer surface of the steel pipe with an anti-corrosion layer of a three-layer composite structure of epoxy powder, adhesive and polyethylene, it can effectively improve the chemical corrosion resistance, cathode stripping resistance and mechanical damage resistance, and has a very wide range of applications. In the prior art, epoxy powder is first sprayed on the outer surface of the steel pipe in a spraying room by a powder spraying mechanism, and then the adhesive is extruded by an extruder and adhered to the outside of the steel pipe, and finally the polyethylene is extruded by an extruder and adhered to the outside of the adhesive layer. In the anti-corrosion process, the steel pipe relies on the rotation of the transmission wheel to provide the power for advancement and rotation.

[0003] The inventors have found that the existing steel pipe anti-corrosion equipment has at least the following disadvantages:

[0004] Two sets of extruders are arranged in sequence on the production line. The two sets of extruders extrude corresponding materials onto the outer surface of the steel pipe respectively. A pressure wheel is configured at the corresponding position of each extruder. The two sets of extruders occupy a large space, and the two extruders need to perform extrusion operations one after another. The process is cumbersome and time-consuming. Since the adhesive is easily adhered to the pressure wheel, the pressure wheel needs to be cleaned regularly, which is time-consuming and labor-intensive, and easily affects the winding quality. Utility Model Content

[0005] The purpose of the utility model is to provide a new type of 3PE steel pipe anti-corrosion equipment, which can improve the compactness of the structure, reduce the overall volume, and reduce the space required for assembly; it can also save working procedures, shorten time, improve processing efficiency, and reduce costs; at the same time, the pressure wheel is not easy to adhere to the sticky adhesive layer, reducing the difficulty of cleaning the pressure wheel, saving time and effort, and improving the winding quality.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In the first aspect, the utility model provides a new type of 3PE steel pipe anti-corrosion equipment, including:

[0008] A winding chamber, a double-layer co-extrusion die, a first extrusion device, a second extrusion device and a pressure wheel, wherein the double-layer co-extrusion die is connected to the winding chamber, and the double-layer co-extrusion die is provided with a converging channel communicating with the inner cavity of the winding chamber; the first extrusion device and the second extrusion device are both connected to the double-layer co-extrusion die, and the material extruded by the first extrusion device and the sheet material extruded by the second extrusion device can be bonded in the converging channel and then enter the winding chamber; the pressure wheel is installed in the inner cavity, and the pressure wheel is used to rotate driven by the steel pipe.

[0009] In an optional embodiment, the first extrusion device and the second extrusion device are respectively arranged on both sides of the double-layer co-extrusion die in the moving direction of the steel pipe.

[0010] Based on the above scheme, the space of the double-layer extrusion die in the length direction of the steel pipe is reasonably utilized, which is conducive to arrangement, and is conducive to the adhesive layer and polyethylene entering the converging channel and combining together in the converging channel, which is conducive to entering the winding chamber together and being wound around the outside of the steel pipe.

[0011] In an optional embodiment, the first extrusion device includes a first extruder, a first conveying pipe and a first connecting plate, the first extruder is connected to one end of the first conveying pipe, and the other end of the first conveying pipe is connected to the double-layer co-extrusion die through the first connecting plate.

[0012] Based on the above scheme, the first extruder is powered by a motor and a reducer, a first extrusion screw is arranged in the first conveying pipe, the motor is connected to the reducer, and the reducer is connected to the first extrusion screw, driving the first extrusion screw to rotate, thereby realizing the extrusion and conveying of the material. In addition, a heating mechanism can be arranged outside the first conveying pipe and on the runner mold to heat the material to a set temperature, which is conducive to the melting flow and extrusion molding of the material.

[0013] In an optional embodiment, the second extrusion device includes a second extruder, a second delivery pipe and a second connecting plate, the second extruder is connected to one end of the second delivery pipe, and the other end of the second delivery pipe is connected to the double-layer co-extrusion die through the second connecting plate.

[0014] Based on the above scheme, the second extruder is powered by a motor and a reducer, a second extrusion screw is arranged in the second conveying pipe, the motor is connected to the reducer, and the reducer is connected to the second extrusion screw, driving the second extrusion screw to rotate, thereby realizing the extrusion and conveying of the material. In addition, a heating mechanism can be arranged outside the second conveying pipe and on the flow channel mold to heat the material to a set temperature, which is conducive to the flow of the material and extrusion molding.

[0015] In an optional embodiment, the cross-sectional shape of the converging channel of the double-layer co-extrusion die is set to a rectangular opening, the length direction of the rectangular opening is consistent with the movement direction of the steel pipe, and the cross-section is a plane perpendicular to the extension direction of the converging channel.

[0016] Based on the above scheme, the adhesive layer and the polyethylene layer are combined in the confluence channel to form a sheet structure. The adhesive layer is located on the side of the polyethylene layer close to the outer surface of the steel pipe. The adhesive layer is in contact with the surface of the steel pipe, and the polyethylene layer is in contact with the pressing wheel body. The viscosity of the polyethylene layer is less than that of the adhesive layer. The polyethylene layer is not easy to adhere to the pressing wheel body, which reduces the labor intensity of cleaning the pressing wheel body and saves time and effort.

[0017] In an optional embodiment, a water passage for cooling liquid to flow is provided inside the pressure wheel.

[0018] Based on the above solution, the coolant can generate heat exchange with the pressing wheel during the flow of the coolant, thereby reducing the temperature of the pressing wheel and further reducing the probability of adhesion between the pressing wheel and the polyethylene adhesive layer.

[0019] In an optional embodiment, the new 3PE steel pipe anti-corrosion equipment also includes a heating component and an epoxy powder spraying chamber, the epoxy powder spraying chamber is located on the inlet side of the double-layer co-extrusion mold, and the heating component is located on the side of the epoxy powder spraying chamber away from the double-layer co-extrusion mold.

[0020] Based on the above method, the steel pipe is first heated to the required temperature by the heating component and then enters the epoxy powder spraying room, where the steel pipe can be powder sprayed. After the spraying is completed, the steel pipe can run to the winding room for the winding process, thereby realizing automated production and improving processing efficiency.

[0021] In an optional embodiment, a conveying wheel set is provided between the epoxy powder spraying chamber and the heating assembly.

[0022] Based on the above scheme, by setting up a conveying wheel group, the conveying wheel group can not only provide a certain power to drive the movement of the steel pipe, but also play a role in supporting the steel pipe, so that longer steel pipes can be processed and production efficiency can be improved.

[0023] In an optional embodiment, the new 3PE steel pipe anti-corrosion equipment also includes a conveying wheel group, which is arranged on the side of the heating component away from the epoxy powder spraying chamber, and the conveying wheel group is used to transport the steel pipe into the epoxy powder spraying chamber.

[0024] Based on the above solution, the steel pipe is transported to the heating component and the epoxy powder spraying room through a conveying wheel group to achieve automated transportation.

[0025] In an optional embodiment, the conveying wheel group includes a bracket and multiple pairs of conveying wheel bodies rotatably mounted on the bracket, the multiple pairs of conveying wheel bodies are arranged at intervals on the bracket along the transport direction of the steel pipe, and the axis of each conveying wheel body has an angle with the transport direction so that the steel pipe can rotate while moving forward.

[0026] Based on the above solution, the transmission wheel assembly has a simple structure and can adjust the inclination angle and rotation speed of each transmission wheel body as needed, thereby adjusting the forward speed and rotation speed of the steel pipe. It is easy to operate and flexible to use, and can adapt to different scene requirements.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the new 3PE steel pipe anti-corrosion equipment provided by this embodiment combines the first extrusion device and the second extrusion device with a double-layer co-extrusion die. The material extruded by the first extrusion device and the material extruded by the second extrusion device can be bonded in the confluence channel of the double-layer co-extrusion die before entering the winding chamber from the confluence channel together. In this way, compared with the traditional structure that two sets of independent extrusion mechanisms need to be configured with two sets of extrusion dies, this embodiment saves a set of discharge dies and reduces the station occupied by an extrusion die, which not only reduces the overall volume, but also reduces the processing steps, shortens the processing time while ensuring the processing quality, and improves the processing efficiency. At the same time, the materials extruded by the first extrusion device and the second extrusion device can be stacked and combined in the confluence channel, so that the adhesive layer is directly attached to the outer surface of the steel pipe, and the polyethylene adhesive layer is located outside the adhesive layer, the polyethylene adhesive layer is in contact with the pressure wheel, and the adhesive layer is not in direct contact with the pressure wheel, which improves the defect that the adhesive layer is in contact with the pressure wheel and is attached to the pressure wheel in large quantities, and the cleaning difficulty of the pressure wheel is low, and the cleaning is time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of a new 3PE steel pipe anti-corrosion equipment according to an embodiment of the utility model.

[0031] icon:

[0032] 001-steel pipe; 002-set direction; 100-winding chamber; 200-double-layer co-extrusion mold; 300-first extrusion device; 310-first extruder; 320-first conveying pipe; 330-first connecting plate; 400-second extrusion device; 410-second extruder; 420-second conveying pipe; 430-second connecting plate; 500-pressing wheel; 600-heating assembly; 700-epoxy powder spraying chamber; 800-conveying wheel group; 900-transmission wheel group; 910-bracket; 920-transmission wheel body; 1000-unloading transmission wheel group. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the prior art, when the adhesive layer and the polyethylene layer are wrapped around the outer surface of the steel pipe 001, they are completed at two stations respectively, that is, on the production line, a powder spraying station, an adhesive layer station and a polyethylene layer station are arranged in sequence, and the steel pipe 001, driven by the transmission wheel group 900, passes through the powder spraying station, the adhesive layer station and the polyethylene layer station in sequence to complete the processes of powder spraying, adhesive layer bonding and polyethylene layer bonding respectively. There are many stations, and the space occupied is large, and the adhesive layer and the polyethylene layer are bonded to the outside of the steel pipe 001 respectively, the process is cumbersome, time-consuming, low processing efficiency and high cost. When the adhesive layer is attached to the steel pipe 001, the pressing wheel 500 contacts the adhesive layer, and the adhesive layer is attached to the pressing wheel 500, which makes it inconvenient to clean the pressing wheel 500.

[0040] In view of this, the designer provides a new type of 3PE steel pipe anti-corrosion equipment with a compact overall structure, small size, small space occupied, fewer processes, and high processing efficiency. The adhesive layer does not directly contact the pressing wheel 500 and is not easy to adhere to the pressing wheel 500. The pressing wheel 500 is easy to clean, saving time and effort.

[0041] Please combine Figure 1 In this embodiment, the new 3PE steel pipe anti-corrosion equipment includes a winding chamber 100, a double-layer co-extrusion mold 200, a first extrusion device 300, a second extrusion device 400 and a pressing wheel 500. The double-layer co-extrusion mold 200 is connected to the winding chamber 100, and the double-layer co-extrusion mold 200 is provided with a converging channel connected to the inner cavity of the winding chamber 100; the first extrusion device 300 and the second extrusion device 400 are both connected to the double-layer co-extrusion mold 200, and the material extruded by the first extrusion device 300 and the material extruded by the second extrusion device 400 can be bonded in the converging channel and then enter the winding chamber 100; the pressing wheel 500 is installed in the inner cavity, and the pressing wheel 500 is used to rotate driven by the steel pipe 001.

[0042] Based on the above scheme, the workflow of the 3PE steel pipe 001 anti-corrosion equipment provided in this embodiment includes, for example:

[0043] The steel pipe 001 is transported along the set direction 002, and the steel pipe 001 can pass through the position of the double-layer co-extrusion die 200. The double-layer co-extrusion die 200 can transport the adhesive layer and the polyethylene layer combined in the converging channel together and wrap them around the outer surface of the steel pipe 001, reducing the process, shortening the time, and improving the processing efficiency. At the same time, the first extrusion device 300 and the second extrusion device 400 are combined by the double-layer co-extrusion die 200, and the sheet material extruded by the first extrusion device 300 and the sheet material extruded by the second extrusion device 400 can first be bonded in the converging channel of the double-layer co-extrusion die 200 and then enter the winding chamber 100 from the converging channel together. In this way, compared with the traditional structure that two sets of independent extrusion mechanisms need to be configured with two sets of extrusion dies, this embodiment saves a set of discharge dies, reduces the station occupied by one extrusion die, not only reduces the overall volume, but also reduces the processing steps, shortens the processing time and improves the processing efficiency under the premise of ensuring the processing quality. At the same time, the materials extruded by the first extrusion device 300 and the second extrusion device 400 can be stacked and combined in the converging channel, so that the adhesive layer is directly attached to the outer surface of the steel pipe 001, and the polyethylene layer is located outside the adhesive layer. The polyethylene layer is in contact with the pressing wheel 500, while the adhesive layer is not in direct contact with the pressing wheel 500, thereby improving the defect that the adhesive layer is in contact with the pressing wheel 500 and is attached to the pressing wheel 500 in large quantities. The pressing wheel 500 is easy to clean, and cleaning saves time and effort.

[0044] The following examples illustrate the details of the new 3PE steel pipe anti-corrosion equipment provided in this application by way of examples.

[0045] In this embodiment, optionally, the first extrusion device 300 and the second extrusion device 400 are respectively arranged on both sides of the double-layer co-extrusion die 200 in the direction of movement of the steel pipe 001. That is, during the processing of the steel pipe 001, the steel pipe 001 can move forward along the set direction 002 under the power drive, and at the same time perform a self-rotation action. The double-layer co-extrusion die 200 has two opposite sides in the set direction 002, wherein the first extrusion device 300 is located on the right side of the double-layer co-extrusion die 200, and the second extrusion device 400 is located on the left side of the double-layer co-extrusion die 200. The first extrusion device 300 is used to extrude the adhesive layer, and the second extrusion device 400 is used to extrude the polyethylene layer. Such a design makes reasonable use of the space of the double-layer extrusion die in the length direction of the steel pipe 001, which is conducive to arrangement, and is conducive to the adhesive layer and polyethylene entering the confluence channel and combining together in the confluence channel, which is conducive to entering the winding chamber 100 together and winding outside the steel pipe 001.

[0046] In this embodiment, optionally, the first extrusion device 300 includes a first extruder 310, a first delivery pipe 320 and a first connection disk 330, the first extruder 310 is connected to one end of the first delivery pipe 320, and the other end of the first delivery pipe 320 is connected to the double-layer co-extrusion die 200 through the first connection disk 330. Optionally, the second extrusion device 400 includes a second extruder 410, a second delivery pipe 420 and a second connection disk 430, the second extruder 410 is connected to one end of the second delivery pipe 420, and the other end of the second delivery pipe 420 is connected to the double-layer co-extrusion die 200 through the second connection disk 430. It should be understood that the shapes of the first delivery pipe 320 and the second delivery pipe 420 are set as required, so that the adhesive layer and the polyethylene adhesive layer bonded in the converging channel are mutually laminated sheet structures.

[0047] It should be noted that the first extruder 310 and the second extruder 410 can both be powered by a motor and a reducer. A first extrusion screw is provided in the first conveying pipe 320, and the reducer of the first extruder 310 is connected to the first extrusion screw. A second extrusion screw is provided in the second conveying pipe 420, and the reducer of the second extruder 410 is connected to the second extrusion screw. The discharge speed is adjusted by adjusting the rotation speed of the extrusion screw.

[0048] In addition, the first connection plate 330 and the second connection plate 430 may both be configured as flange structures.

[0049] In this embodiment, the cross-sectional shape of the converging channel of the double-layer co-extrusion die 200 is optionally set to a rectangular opening, the length direction of the rectangular opening is consistent with the movement direction of the steel pipe 001, and the cross-sectional shape is a plane perpendicular to the extension direction of the converging channel. The adhesive layer and the polyethylene layer are combined in the converging channel to form a sheet structure, the adhesive layer is located on the side of the polyethylene layer close to the outer surface of the steel pipe 001, the adhesive layer is in contact with the surface of the steel pipe 001, and the polyethylene layer is in contact with the main body of the pressing wheel 500. The viscosity of the polyethylene layer is less than that of the adhesive layer, and the polyethylene layer is not easy to adhere to the main body of the pressing wheel 500, which reduces the labor intensity of cleaning the main body of the pressing wheel 500, saving time and effort.

[0050] It should be understood that the end of the double-layer co-extrusion die 200 can be inserted into the winding chamber, and the connection structure is stable and reliable.

[0051] In this embodiment, optionally, a water passage for coolant to flow is provided inside the pressing wheel 500. During the flow of the coolant, heat exchange can be generated with the pressing wheel 500, thereby reducing the temperature of the pressing wheel 500, further reducing the probability of adhesion between the pressing wheel 500 and the polyethylene adhesive layer, and reducing the difficulty of cleaning the pressing wheel 500.

[0052] In this embodiment, optionally, the novel 3PE steel pipe anticorrosion equipment further includes a heating assembly 600, an epoxy powder spraying chamber 700, a conveying wheel set 800 and a transmission wheel set 900. The epoxy powder spraying chamber 700 is located at the inlet side of the double-layer co-extrusion die 200, and the heating assembly 600 is located at the side of the epoxy powder spraying chamber 700 away from the double-layer co-extrusion die 200. The conveying wheel set 800 is located between the epoxy powder spraying chamber 700 and the heating assembly 600. The transmission wheel set 900 is arranged at the side of the heating assembly 600 away from the epoxy powder spraying chamber 700, and the transmission wheel set 900 is used to transport the steel pipe 001 into the epoxy powder spraying chamber 700.

[0053] It should be noted that the steel pipe 001 is first heated by the heating assembly 600 and then enters the epoxy powder spraying chamber 700. The steel pipe 001 can be powder sprayed in the epoxy powder spraying chamber 700. After the spraying is completed, the steel pipe 001 can be moved to the winding chamber 100 for the winding process, thereby realizing automated production and improving processing efficiency. By setting the conveying wheel group 800, the conveying wheel group 800 can not only provide a certain amount of power to drive the steel pipe 001 to move, but also play a role in supporting the steel pipe 001, so that longer steel pipes 001 can be processed, thereby improving production efficiency. The steel pipe 001 is transported to the heating assembly 600 and the epoxy powder spraying chamber 700 by the conveying wheel group 900, thereby realizing automated transportation.

[0054] It should be understood that the structures of the conveying wheel set 800 and the transmission wheel set 900 can be set to be the same. In this embodiment, the structure of the transmission wheel set 900 is used as an example for description. The transmission wheel set 900 includes a bracket 910 and multiple pairs of transmission wheel bodies 920 rotatably mounted on the bracket 910. The multiple pairs of transmission wheel bodies 920 are arranged at intervals on the bracket 910 along the transportation direction of the steel pipe 001. The axis of each transmission wheel body 920 has an angle with the transportation direction, so that the steel pipe 001 rotates while moving forward.

[0055] With such a design, the 900-piece transmission wheel assembly has a simple structure, and can adjust the inclination angle and rotation speed of each transmission wheel body 920 as needed, thereby adjusting the forward speed and rotation speed of the steel pipe 001. It is easy to operate and flexible to use, and can adapt to different scene requirements.

[0056] It should be noted that the pressing wheel 500 can be a high temperature resistant silicone wheel.

[0057] It should be understood that a discharge conveying wheel set 1000 can also be set on the rear side of the double-layer co-extrusion mold 200, which can transport the completed wound steel pipe 001 to the unloading area, and during the unloading process, the steel pipe 001 can be cooled by a cooling mechanism.

[0058] The new 3PE steel pipe anti-corrosion equipment provided in this embodiment has at least the following advantages:

[0059] 1. The first extrusion device 300 and the second extrusion device 400 are combined through a double-layer co-extrusion die 200, thereby reducing a winding process during production;

[0060] 2. The risk of the silicone wheel being adhered by adhesive is greatly reduced. Specifically, the traditional winding equipment first squeezes the adhesive resin into a sheet and wraps it on the surface of the steel pipe 001, and then uses the silicone wheel to press and fit. When the adhesive resin is just squeezed out of the mold, it is in a molten state and has a very strong viscosity. When it is just squeezed out and pressed by the bottom silicone wheel, the adhesive resin is very easy to be adhered to the silicone wheel. Therefore, the operator has to spray a release agent on the silicone wheel from time to time. In the embodiment of the present application, the two adhesives are first squeezed to the mold outlet, and then converged and fused without gap at the mold outlet, and then squeezed out of the mold outlet at the same time. The adhesive resin is on the side close to the steel pipe 001, and the polyethylene resin material is on the side close to the silicone wheel. The polyethylene resin has no adhesive effect on the silicone wheel, so there is basically no risk of adhesion of an adhesive layer on the silicone wheel when pressed;

[0061] 3. The bonding effect of adhesive resin is stronger than that of polyethylene resin, because the silicone wheel on the equipment is provided with a channel for the flow of coolant inside, and the silicone wheel is cooled by the coolant. Under the continuous and repeated clamping of the silicone wheel, the surface of the adhesive resin after contact with the silicone wheel gradually forms a crystallized state, and there is also a barrier of foreign matter (dust, mold release agent pollution), which affects the bonding effect with the outer polyethylene layer. In addition, due to the temperature loss caused by time, when the polyethylene layer is wrapped, the surface of the adhesive layer has begun to solidify, so the optimal temperature for bonding has been lost. It can be seen that the bonding effect of the polyethylene layer and the adhesive layer of the new double-layer co-extrusion mold 200 is greater than the bonding effect after extrusion by two sets of molds;

[0062] 4. At present, the length of the 3PE winding area and the powder spraying area of ​​the known equipment will exceed 3 meters. Since the winding area reduces a set of molds and an operating station, it can save half of the space. Therefore, the spraying area and the mold winding area can be completely controlled within 2.5 meters. Even if the 6-meter-long steel pipe 001 end is produced, it can cross the powder spraying and winding area to reach the opposite conveyor wheel, and there will be no stumbling due to the large span. Therefore, the new 3pe anti-corrosion production line is fully capable of directly producing all fixed-length (6 meters, 9 meters, 12 meters) 3pe anti-corrosion steel pipe 001 in the industry;

[0063] 5. It not only reduces the labor intensity of manual labor, but also saves time. At present, it is known that the production of 6-meter-long steel pipes depends on electric welding or assembly of lining connections. The solution of this embodiment does not need to connect in series to damage the anti-corrosion layer at both ends of the pipe. If the connection is not connected in series, there will be no extended joint length. Therefore, it not only saves time but also saves the cost of raw materials for the outer layer.

[0064] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of 3PE steel pipe anti-corrosion equipment, characterized in that: include: A winding chamber (100), a double-layer co-extrusion die (200), a first extrusion device (300), a second extrusion device (400) and a pressing wheel (500), wherein the double-layer co-extrusion die (200) is connected to the winding chamber (100), and the double-layer co-extrusion die (200) is provided with a merging channel communicating with the inner cavity of the winding chamber (100); the first extrusion device (300) and the second extrusion device (400) are both connected to the double-layer co-extrusion die (200), and the material extruded by the first extrusion device (300) and the sheet material extruded by the second extrusion device (400) can be bonded in the merging channel and then enter the winding chamber (100); the pressing wheel (500) is installed in the inner cavity, and the pressing wheel (500) is used to rotate under the drive of the steel pipe (001).

2. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The first extrusion device (300) and the second extrusion device (400) are respectively arranged on both sides of the double-layer co-extrusion die (200) in the moving direction of the steel pipe (001).

3. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The first extrusion device (300) includes a first extruder (310), a first delivery pipe (320) and a first connecting plate (330), wherein the first extruder (310) is connected to one end of the first delivery pipe (320), and the other end of the first delivery pipe (320) is connected to the double-layer co-extrusion die (200) via the first connecting plate (330).

4. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The second extrusion device (400) includes a second extruder (410), a second delivery pipe (420) and a second connecting plate (430), wherein the second extruder (410) is connected to one end of the second delivery pipe (420), and the other end of the second delivery pipe (420) is connected to the double-layer co-extrusion die (200) via the second connecting plate (430).

5. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The cross-sectional shape of the converging channel of the double-layer co-extrusion die (200) is set to be a rectangular opening, the length direction of the rectangular opening is consistent with the moving direction of the steel pipe (001), and the cross-sectional shape is a plane perpendicular to the extension direction of the converging channel.

6. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The pressure wheel (500) is provided with a water passage inside for the circulation of cooling liquid.

7. The new 3PE steel pipe anti-corrosion equipment according to claim 1 is characterized in that: The novel 3PE steel pipe anti-corrosion equipment also includes a heating component (600) and an epoxy powder spraying room (700), wherein the epoxy powder spraying room (700) is located at the inlet side of the double-layer co-extrusion die (200), and the heating component (600) is located at a side of the epoxy powder spraying room (700) away from the double-layer co-extrusion die (200).

8. The new 3PE steel pipe anti-corrosion equipment according to claim 7 is characterized in that: A conveying wheel assembly (800) is provided between the epoxy powder spraying chamber (700) and the heating assembly (600).

9. The new 3PE steel pipe anti-corrosion equipment according to claim 7 is characterized in that: The novel 3PE steel pipe anti-corrosion equipment also includes a conveying wheel group (900), which is arranged on a side of the heating component (600) away from the epoxy powder spraying chamber (700), and the conveying wheel group (900) is used to convey the steel pipe (001) into the epoxy powder spraying chamber (700).

10. The new 3PE steel pipe anti-corrosion equipment according to claim 9 is characterized in that: The transmission wheel assembly (900) comprises a bracket (910) and a plurality of pairs of transmission wheel bodies (920) rotatably mounted on the bracket (910); the plurality of pairs of transmission wheel bodies (920) are arranged on the bracket (910) at intervals along the transport direction of the steel pipe (001); the axis of each transmission wheel body (920) has an angle with the transport direction, so that the steel pipe (001) rotates while moving forward.

Images