CN114683456A - Production method and device of integrated inner epoxy and outer polyethylene anticorrosive layer - Google Patents
Production method and device of integrated inner epoxy and outer polyethylene anticorrosive layer Download PDFInfo
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- CN114683456A CN114683456A CN202210282543.1A CN202210282543A CN114683456A CN 114683456 A CN114683456 A CN 114683456A CN 202210282543 A CN202210282543 A CN 202210282543A CN 114683456 A CN114683456 A CN 114683456A
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- steel pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/38—Moulds, cores or other substrates
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Abstract
The invention relates to a production method and a device of an integrated inner epoxy and outer polyethylene anticorrosive layer. The method comprises the following steps: conveying the steel pipe to a position of a medium-frequency heating coil, and meanwhile, placing molding powder on the inner wall of the steel pipe; the steel pipe put into the plastic powder rotates to pass through the medium-frequency heating coil, the outer wall of the heated steel pipe is sprayed with the epoxy anticorrosive coating after passing through the medium-frequency heating coil, and then the adhesive layer and the polyethylene layer are wound. The problems of performance reduction and corrosion prevention effect reduction caused by the fact that the inner wall epoxy coating is affected by high temperature secondarily due to secondary heating are avoided. The problem that the performance of the inner epoxy coating is damaged by secondary heating is solved; half of the power consumption is reduced, and the labor cost of one process is reduced.
Description
Technical Field
The invention belongs to the technical field of anticorrosive steel pipes, and particularly relates to a production method and a device of an integrated inner epoxy and outer polyethylene anticorrosive layer.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The pipe with the inner epoxy and the outer polyethylene anticorrosive layer has the advantages of strong corrosion resistance, long service life, low friction coefficient and the like. The production method of the anticorrosive coating of the pipe generally comprises the step of separately producing the inner epoxy anticorrosive coating and the outer polyethylene anticorrosive coating, wherein the steel pipe needs to be heated twice to cause higher overall energy consumption, and the epoxy coating on the inner wall is influenced by high temperature twice to cause performance reduction and anticorrosive effect reduction.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method and a device for producing an integrated inner epoxy and outer polyethylene anticorrosive layer.
In order to solve the technical problems, the technical scheme of the invention is as follows:
in a first aspect, a method for producing an integrated inner epoxy outer polyethylene anticorrosive layer comprises the following steps:
conveying the steel pipe to a position of a medium-frequency heating coil, and meanwhile, placing molding powder on the inner wall of the steel pipe;
the steel pipe put into the plastic powder rotates to pass through the medium-frequency heating coil, the outer wall of the heated steel pipe is sprayed with the epoxy anticorrosive coating after passing through the medium-frequency heating coil, and then the adhesive layer and the polyethylene layer are wound.
The invention provides a method for preparing an inner anticorrosive layer by using the condition that the temperature of the anticorrosive layer production process of the inner wall and the outer wall of a steel pipe is similar in the process of rotating the steel pipe through a medium-frequency heating coil, and the inner anticorrosive layer is prepared in the process of heating the steel pipe, and the outer anticorrosive layer is immediately produced after passing through the medium-frequency heating coil, so that the anticorrosive layer on the inner wall and the anticorrosive layer on the outer wall of the steel pipe can be simultaneously finished by one-time heating, the plastic powder on the inner wall is prepared into the anticorrosive layer by adopting a roll coating method, and the outer wall is prepared by adopting a spraying and winding method. The problem of energy consumption of twice heating and the problem that twice heating reduces the performance of the inner epoxy anticorrosive coating processed in advance are solved.
The inner epoxy outer polyethylene anticorrosive layer is also called as an inner epoxy outer 3PE anticorrosive layer.
One or more technical schemes of the invention have the following beneficial effects:
the invention discloses a production method of an integrated inner epoxy and outer polyethylene anticorrosive layer, and provides a method for simultaneously preparing inner epoxy anticorrosion and outer polyethylene anticorrosion, so that the problems of performance reduction and anticorrosion effect reduction caused by secondary high temperature influence on an inner wall epoxy coating due to secondary heating are solved. The problem that the performance of the inner epoxy coating is damaged by secondary heating is solved; reduces half of the power consumption and the labor cost of one process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a diagram of a production apparatus for an integrated inner epoxy and outer polyethylene anticorrosive layer;
FIG. 2 is a schematic view of a steel pipe on a plate link chain;
the device comprises a pipe plate feeding chain 1, a pipe plate feeding chain 2, a steel pipe 3, a spiral feeding machine 4, a spiral conveying line 5, a medium-frequency heating coil 6, an epoxy spraying device 7, an adhesive extruding machine 8, a polyethylene extruding machine 9, a cooling water spraying room 10, a pipe plate feeding chain 11 and a port beveling device.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The production process flow of the epoxy outer polyethylene anticorrosive coating in the existing steel pipe is as follows: steel pipe-external rust removal-internal rust removal-intermediate frequency heating (or heating by a combustion furnace), internal epoxy corrosion prevention-intermediate frequency heating-external epoxy bottom spraying-adhesive winding-PE layer winding-cooling-two-end coating groove-packaging, printing-inspecting and warehousing; the biggest problem that exists when interior epoxy outer 3PE anticorrosive tubular product is produced lies in that whole product divides two steps production, needs to heat the steel pipe twice and causes the overall energy consumption higher and inner wall epoxy coating secondary receives high temperature to influence and causes performance reduction, anticorrosive effect to reduce. Therefore, the problems which plague the industry for producing the inner epoxy and the outer 3PE are fundamentally that: 1. the internal epoxy and the 3PE are separately produced to cause secondary heating, so that the overall energy consumption is overhigh; 2. the inner epoxy and the 3PE are separately produced to cause secondary heating, so that the inner epoxy coating is heated at a high temperature for the second time, the corrosion resistance is influenced, and the corrosion resistance life is shortened. 3. The production efficiency of the internal epoxy is low, and the production efficiency of 3PE is restricted.
The conventional process of the existing anticorrosion method of the inner epoxy anticorrosion layer comprises the following steps: a is the spraying process of the heating inner wall of intermediate frequency, the mode (spray after the rifle bar stretches into the steel pipe inner wall) that the one end enters the rifle while producing of this process, the mode of spraying of the course of going back, the inner epoxy pipe that this process produces, the inner wall epoxy coating is comparatively rough, the epoxy powder floats and causes the coating of secondary pollution more seriously in the course of spraying, and the floating powder quantity is great and the collection difficulty is great; in addition, the process can cause uneven temperature of the steel pipe, the temperature is low during middle spraying, the temperature is high during spraying at two ends, the overall appearance is poor (the two ends slightly change color, and the middle is normal color), the mode is used for producing the pipe in an intermittent mode, and the failure rate is high due to frequent starting of intermediate frequency equipment. The other is a roller coating process for the heating inner wall of the bread oven: the production process has high efficiency and good appearance quality, but the process uses natural gas for heating, has high production cost and high environmental protection requirement on a burner (the environmental protection requirement is an ultra-low nitrogen burner).
In a first aspect, a method for producing an integrated inner epoxy outer polyethylene anticorrosive layer comprises the following steps:
conveying the steel pipe to a position of a medium-frequency heating coil, and meanwhile, placing molding powder on the inner wall of the steel pipe;
the steel pipe put into the plastic powder rotates to pass through the medium-frequency heating coil, the outer wall of the heated steel pipe is sprayed with the epoxy anticorrosive coating after passing through the medium-frequency heating coil, and then the adhesive layer and the polyethylene layer are wound.
According to the invention, by combining the principle of an inner epoxy anticorrosion process and the characteristics of intermediate frequency heating and combining the inner epoxy production process and the 3PE production process, the inner epoxy and the outer 3PE are heated once to complete the effect of simultaneous anticorrosion of the inner wall and the outer wall.
The mode of the roll coating process adopted by the internal epoxy anticorrosion is as follows: after the plastic powder is poured into the inner wall of the rotating steel pipe, the plastic powder is instantly contacted with the steel pipe, the steel pipe is in a rapidly selected condition, the plastic powder is in a molten state and is uniformly distributed along with the steel pipe selection under the condition of the temperature of the internal epoxy production process, and a coating after corrosion prevention is uniform and has a smooth appearance.
The steel pipe rotates and advances on the spiral conveying line, the steel pipe rotates to pass through the medium-frequency heating coil, the spray gun stretches into the inner wall of the steel pipe to achieve the process temperature to spray, the steel pipe is in a rotating state, and an anticorrosive coating is formed after the pipe is cooled.
After the inner corrosion-resistant steel pipe is conveyed to a spiral conveying line, the inner corrosion-resistant steel pipe is subjected to intermediate frequency heating, outer epoxy spraying, adhesive winding and PE layer winding along with the conveying line.
The principle of the production method of the integrated inner epoxy outer polyethylene anticorrosive layer is as follows:
1) the roller coating principle is utilized: the steel pipe rotates rapidly, and the powder is in instant contact with the heated steel pipe; the steel tube is heated instantaneously just when passing through the intermediate frequency on the spiral conveying line, and the powder rotates rapidly on the inner wall of the steel tube all the time. 2) The characteristic that the process temperature of the inner epoxy is consistent with that of the outer 3PE is utilized: the production process temperature of the internal epoxy and the 3PE are both about 200 ℃; 3) the bottom layer of the outer wall of the 3PE also adopts epoxy powder: the inner wall and the outer wall are both provided with epoxy powder; the distance from spraying epoxy to water spraying room; the powder can completely meet the requirements of the curing process in terms of performance. The process has also been validated through practical experimentation. The process is relatively simple.
In some embodiments of the invention, the heating temperature of the medium frequency heating coil on the steel pipe is 180-220 ℃; preferably 200 deg.c. The production process of the inner epoxy and the production process of the outer epoxy both have the temperature of about 200 ℃.
In some embodiments of the invention, the plastic powder is placed on the inner wall of the steel pipe by using a spiral feeder, and the spiral feeder is provided with a feeding rod which extends into the inner side of the steel pipe during feeding and feeds the plastic powder at a position opposite to the medium-frequency heating coil. Further, the length of the feeding rod is more than or equal to that of the steel pipe. Further, the feeding rod is of a rod body structure with one open end.
In some embodiments of the invention, the steel tube is conveyed and the feeding of the inner wall of the steel tube is started at a position where the conveying line is at a distance from the medium frequency heating coil which is greater than the length of the steel tube. Furthermore, the distance between the steel pipe and the medium-frequency heating coil is 0.5-1.5 m.
In a further embodiment of the invention, the feeding rod of the screw feeder extends out of the steel pipe when the tail end of the steel pipe is 0.8-1.2m away from the medium frequency heating coil during the rotation of the steel pipe through the medium frequency heating coil, and stops feeding when the pipe wall of the steel pipe is extended out.
When the left 1 m length of the first pipe does not pass through the intermediate frequency, the 1 m length adopts a feeding machine backward feeding mode (the blanking amount is increased according to the total speed increasing proportion), at the moment, the second pipe is conveyed to a conveying line to be subjected to pipe chasing, an inner wall feeding device quickly extends to the intermediate frequency position, and feeding is started when the port of the second pipe passes through the intermediate frequency; the whole rhythm is carried out in sequence, so that the 3PE is continuously produced.
In a further embodiment of the present invention, when the distance between the tail end of the steel pipe and the medium frequency heating coil is 0.8 to 1.2m, the feeding amount of the screw feeder is the raw material amount × (steel pipe advancing speed + feed bar retreating speed)/(steel pipe advancing speed)).
The technical difficulty solved by the invention is as follows:
1) the inner wall powder can not be poured into the inner wall of the pipe in advance, because the pipe with the inner wall added with the epoxy powder rotates and moves forwards on the spiral conveying line, the inner wall powder of the pipe is dispersed and distributed from the two ends of the middle item through a plurality of tests in the motion state, if the epoxy powder in the conventional feeding mode runs on the conveying line to the middle frequency and the powder at the two ends gradually overflows before heating, the coating thickness can not meet the requirement; 2) the production process must ensure continuous production and uninterrupted mode; 3) the inner wall coating of the pipe needs to be ensured to be uniform, smooth and consistent, and if spraying is adopted, the appearance quality of the inner wall cannot be ensured.
The process can be realized by solving the problems through experiments; aiming at the difficulty of item 1), an online feeding mode is adopted, and the characteristic of stable feeding of a spiral feeder is utilized to process a feeding rod into a feeding rod with the length of 12 meters; when the steel pipe conveys the intermediate frequency, this feeding rod stretches into the steel pipe inner wall and feeds in raw material, and this feeding mode is stable even. Aiming at the difficulties in the items 2) and 3), when the remaining 1 m of the pipe passes through the intermediate frequency, performing retreating feeding, wherein the feeding amount during retreating is equal to the original feeding amount x (the advancing speed of the steel pipe plus the retreating speed of the feeding rod)/(the advancing speed of the steel pipe); withdraw from the rifle in advance, after second tubular product fortune arrives the transmission line and pursues the pipe, the feeding rod is stretching into to the intermediate frequency position and is carried out the unloading in order to guarantee whole continuous production and guarantee that the reinforced volume is even, and the coating is even.
In some embodiments of the invention, after the preparation of the outer anticorrosive layer of the steel pipe, the steel pipe is subjected to a cooling treatment; further, the steel pipe is cooled by a water spraying cooling method.
The invention relates to a method for producing an anticorrosive coating of an anticorrosive steel pipe, wherein the material of the steel pipe is not particularly limited.
The second aspect, an apparatus for producing of outer ethylene anticorrosive coating of epoxy in integral type, including spiral feeder, the auger delivery line, intermediate frequency heating coil, epoxy spraying device, the adhesive extruder, the polyethylene extruder, spiral feeder includes feeder and feeding pole, the feeding pole can be for the flexible setting of feeder, spiral feeder sets up in one side of auger delivery line, the auger delivery line passes intermediate frequency heating coil setting, intermediate frequency heating coil, epoxy spraying device, the adhesive extruder, the polyethylene extruder sets gradually along the direction of advance of steel pipe, the auger delivery line is arranged along the direction of advance of steel pipe.
In some embodiments of the invention, the conveyor line further comprises an upper tube sheet chain, and the upper tube sheet chain is arranged in a direction perpendicular to the front end of the spiral conveying line.
In some embodiments of the invention, the cooling water shower is provided at a position downstream of the polyethylene extruder.
In some embodiments of the invention, the conveyor line further comprises a lower tube sheet chain arranged in a direction perpendicular to the tail end of the spiral conveying line.
A chain conveying mechanism for an upper pipe plate chain and a lower pipe plate chain comprises two parallel chains and a rotating structure, a shifting fork is used for shifting a steel pipe into the plate chain during operation (a V-shaped block is arranged on the plate chain), the chains are driven by a motor to move in parallel, so that the steel pipe is driven to move forwards, and when a specific position is reached, the pipe is shifted into a spiral conveying line by the shifting fork to be normally conveyed. Fig. 2 is a schematic diagram of a steel pipe on a plate link chain.
The spiral conveying line passes through the intermediate frequency heating coil, and the steel pipe is heated in the process of passing through the intermediate frequency heating coil.
The epoxy spraying coating is to spray epoxy powder on the tank body.
The adhesive extruder can extrude the adhesive layer, and the adhesive layer is wound on the steel pipe in the rotating process of the steel pipe.
The polyethylene extruder extrudes the polyethylene layer, and the polyethylene layer is wound on the steel pipe in the rotating process of the steel pipe.
Example 1
The production device of the integrated inner epoxy and outer ethylene anticorrosive layer comprises a spiral feeding system 3; a helical conveyor line 4; a medium-frequency heating coil 5; an epoxy spraying device 6; an adhesive extruder 7; a polyethylene extruder 8; a cooling water shower 9; a lower tube sheet chain 10; port beveling apparatus 11.
The production method of the integrated inner epoxy outer polyethylene anticorrosive coating comprises the following steps:
as shown in fig. 1: the steel pipe 2 needing corrosion prevention is conveyed to a spiral conveying line 4 through an upper pipe plate chain 1; the base pipe 2 needing corrosion prevention is close to the medium-frequency heating coil 5 under the rotary advancing conveying of the spiral conveying line 4; when the base pipe 2 needing corrosion prevention reaches the intermediate frequency heating coil 5, the spiral feeding system 3 rapidly moves forward, a feeding rod of the spiral feeding system extends into the inner wall of the base pipe 2 needing corrosion prevention to the intermediate frequency heating coil 5, and a feeding function is started (specific parameters are determined according to the plastic powder quantity required by each pipe, at the moment, the spiral feeding system 3 is not moved, and only the steel pipe moves forward); under the condition that the base pipe 2 needing corrosion prevention advances through the medium-frequency heating coil 5 in the high-speed rotation of the spiral conveying line 4 (the heating temperature is about 200 ℃), the epoxy plastic powder uniformly falling from the inner wall is uniformly distributed under the condition that the steel pipe rotates and forms a uniform epoxy coating after being heated; when the distance between the rear end of the steel pipe 2 to be protected from corrosion is about 1 m, the spiral feeding system 3 rapidly extends out (the feeding amount when the distance between the rear end of the steel pipe 2 to be protected from corrosion is about 1 m needs to be adjusted to be equal to the original feeding amount x (the advancing speed of the steel pipe + the retreating speed of the feeding rod)/(the advancing speed of the steel pipe)), the feeding is stopped when the spiral feeding system extends out of the pipe wall, and the spiral feeding system moves back to the initial position; at the moment, the next steel pipe is conveyed to the spiral conveying line 4 on the upper pipe plate chain 1; the operation is repeated in sequence, and the continuous production is ensured. The steel pipe 2 to be protected from corrosion is sprayed with an outer epoxy bottom layer when passing through a medium-frequency heating coil 5 to an outer epoxy spraying device 6, and is wound with an adhesive and polyethylene according to a 3PE production process when passing through an adhesive extruder 7 and a polyethylene extruder 8; cooling the wound coil by a cooling water spraying room 9; and (3) conveying the cooled pipe to a port beveling device 11 under the condition of conveying the lower pipe plate chain 10 to perform port coating groove reservation treatment. And the whole process flow is finished after the whole anticorrosion is finished and the packaging and printing are carried out. The internal and external walls of the internal epoxy and external 3PE are simultaneously antiseptic only by once intermediate frequency heating in the whole production process. The application of the process can promote the development and application of the inner epoxy and outer 3PE anti-corrosion pipe in the industry.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A production method of an integrated inner epoxy outer polyethylene anticorrosive layer is characterized by comprising the following steps: conveying the steel pipe to a position of a medium-frequency heating coil, and meanwhile, placing molding powder on the inner wall of the steel pipe;
the steel pipe put into the plastic powder rotates to pass through the medium-frequency heating coil, the outer wall of the heated steel pipe is sprayed with the epoxy anticorrosive coating after passing through the medium-frequency heating coil, and then the adhesive layer and the polyethylene layer are wound.
2. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: the heating temperature of the medium-frequency heating coil to the steel pipe is 180-220 ℃.
3. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: the plastic powder is placed on the inner wall of the steel pipe by adopting a spiral feeding machine, the spiral feeding machine is provided with a feeding rod, and the feeding rod extends into the inner side of the steel pipe in the feeding process to feed materials at the position opposite to the medium-frequency heating coil.
4. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: and conveying the steel pipe, and starting to feed the inner wall of the steel pipe at the position where the distance between the conveying line and the medium-frequency heating coil is greater than the length of the steel pipe. Further, the distance between the steel pipe and the intermediate frequency heating coil is 0.5-1.5 m.
5. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: in the process that the steel pipe rotates to pass through the medium-frequency heating coil, when the distance between the tail end of the steel pipe and the medium-frequency heating coil is 0.8-1.2m, the feeding rod of the spiral feeding machine extends out of the steel pipe, and feeding is stopped when the feeding rod extends out of the pipe wall of the steel pipe.
6. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: when the distance between the tail end of the steel pipe and the medium-frequency heating coil is 0.8-1.2m, the feeding amount of the screw feeder is the raw material amount x (steel pipe advancing speed + feed bar retreating speed)/(steel pipe advancing speed)).
7. The method for producing the integrated inner epoxy outer polyethylene anticorrosive layer according to claim 1, characterized in that: after the preparation of the outer anticorrosive layer of the steel pipe, cooling the steel pipe; and further, cooling the steel pipe by a water spraying cooling method.
8. Production device of outer ethylene anticorrosive coating of epoxy in the integral type, its characterized in that: including spiral feeder, the spiral delivery line, intermediate frequency heating coil, epoxy spraying device, the adhesive extruder, the polyethylene extruder, spiral feeder includes feeder and feeding pole, the feeding pole can be for the flexible setting of feeder, spiral feeder sets up in one side of spiral delivery line, the spiral delivery line passes intermediate frequency heating coil and sets up, intermediate frequency heating coil, epoxy spraying device, the adhesive extruder, the polyethylene extruder sets gradually along the direction of advance of steel pipe, the direction of advance of spiral delivery line along the steel pipe arranges.
9. The apparatus for producing an integral inner epoxy and outer ethylene anticorrosive coating according to claim 8, wherein: still include the last tube plate chain, go up the tube plate chain setting in the direction of perpendicular to spiral conveying line front end.
10. The apparatus for producing an integral inner epoxy and outer ethylene anticorrosive coating according to claim 8, wherein: the cooling water spraying room is arranged at the downstream position of the polyethylene extruder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210282543.1A CN114683456A (en) | 2022-03-22 | 2022-03-22 | Production method and device of integrated inner epoxy and outer polyethylene anticorrosive layer |
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| CN202210282543.1A CN114683456A (en) | 2022-03-22 | 2022-03-22 | Production method and device of integrated inner epoxy and outer polyethylene anticorrosive layer |
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| CN202210282543.1A Pending CN114683456A (en) | 2022-03-22 | 2022-03-22 | Production method and device of integrated inner epoxy and outer polyethylene anticorrosive layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115646774A (en) * | 2022-11-04 | 2023-01-31 | 山东东宏管业股份有限公司 | Intermediate-frequency heating control method and production system for internal epoxy external 3PE production line |
| CN116586273A (en) * | 2023-04-03 | 2023-08-15 | 山东东宏管业股份有限公司 | Internal epoxy roll coating front intermediate frequency heating production process and system |
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| CN113441959A (en) * | 2021-08-02 | 2021-09-28 | 山东福源管业有限公司 | Full-automatic spiral steel pipe anticorrosion integrated production line and production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109210282A (en) * | 2018-10-23 | 2019-01-15 | 山东禹王管业有限公司 | A kind of heavy caliber anti-corrosive steel tube and manufacture craft |
| CN210024960U (en) * | 2019-06-19 | 2020-02-07 | 华北理工大学 | Pipe wall anticorrosive coating device of electric heater heating through pipe |
| CN211937512U (en) * | 2019-12-09 | 2020-11-17 | 天津市亿利达钢管有限公司 | Anticorrosive processingequipment of steel pipe inside and outside wall |
| CN113441959A (en) * | 2021-08-02 | 2021-09-28 | 山东福源管业有限公司 | Full-automatic spiral steel pipe anticorrosion integrated production line and production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115646774A (en) * | 2022-11-04 | 2023-01-31 | 山东东宏管业股份有限公司 | Intermediate-frequency heating control method and production system for internal epoxy external 3PE production line |
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