阅读说明：本技术 管道保温层连续喷涂后缠绕塑料保护层成型系统及工艺 (System and process for forming plastic protective layer by winding after continuous spraying of pipeline heat-insulating layer ) 是由 乔军平 屈磊 牟国栋 韩勇 西春生 陈华栋 王涵 蒋鸿 罗维多 龙强 蒲旭亮 于 2020-06-02 设计创作，主要内容包括：本发明涉及一种管道保温层连续喷涂后缠绕塑料保护层成型系统及工艺,包括依次包括第一动力传输轮区、第一喷涂工位区、报警线敷设区、第二喷涂工位区、柔性带式动力滚轮区、泡沫熟化区、第二动力传输轮区、聚乙烯外护层缠绕区和水冷区,工艺过程为聚氨酯泡沫层一次喷涂、报警线布线、聚氨酯泡沫层二次喷涂、熟化、聚乙烯防护层热缠绕、碾压、冷却。本发明泡沫喷涂层成型连续,报警线在线放置,机械化自动化程度高、适用于重载管和超厚绝热保温连续成型,工效高、节省原材料、无偏心、环境污染小,保温层密度以及厚度均匀度高。(The invention relates to a system and a process for forming a plastic protection layer wound after a pipeline heat-insulating layer is continuously sprayed, wherein the system comprises a first power transmission wheel area, a first spraying station area, an alarm line laying area, a second spraying station area, a flexible belt type power roller area, a foam curing area, a second power transmission wheel area, a polyethylene outer protection layer winding area and a water cooling area in sequence, and the process comprises the steps of primary spraying of a polyurethane foam layer, wiring of an alarm line, secondary spraying of the polyurethane foam layer, curing, hot winding, rolling and cooling of the polyethylene protection layer. The foam spraying layer is continuously formed, the alarm line is placed on line, the mechanical automation degree is high, the foam spraying layer is suitable for continuously forming heavy-duty pipes and ultra-thick heat insulation and heat preservation, the work efficiency is high, raw materials are saved, the eccentricity is avoided, the environmental pollution is small, and the density and the thickness uniformity of the heat preservation layer are high.)

1. The plastic protection layer winding system after the continuous spraying of the pipeline heat-insulating layer is characterized by sequentially comprising a first power transmission wheel area, a first spraying station area, an alarm line laying area, a second spraying station area, a flexible belt type power roller area, a foam curing area, a second power transmission wheel area, a polyethylene outer protective layer winding area and a water cooling area, wherein the first power transmission wheel area and the second power transmission wheel area are provided with a plurality of power transmission rollers (9), the first spraying station area is provided with a first polyurethane foam spraying gun (7), the alarm line laying area is provided with an alarm line online wiring device (6), the second spraying station area is provided with a second polyurethane foam spraying gun (4), and the first spraying station area, the alarm line laying area and the second spraying station area are all provided with a plurality of flexible belt type power rollers (3), the utility model discloses a flexible belt power gyro wheel is provided with flexible belt power gyro wheel district and flexible belt power gyro wheel district is provided with a plurality of flexible belt power gyro wheels (3), flexible belt power gyro wheel district is provided with first fortune pipe dolly (2), second power transmission takes turns the district below to be provided with second fortune pipe dolly (11), polyethylene outer jacket winding district is provided with extruding machine (13) and rubber and rolls roller (15), the water-cooling district is provided with water cooling system (16).

2. The system for forming the plastic protective layer wound on the insulating layer of the pipeline after being continuously sprayed according to claim 1, wherein the flexible belt power roller (3) and the power transmission roller (9) are both driven by a drive reducer (19), and the contact area between the flexible belt power roller (3) and the foam layer is larger than the contact area between the power transmission roller (9) and the steel pipe.

3. The system for forming the plastic protective layer wound on the insulating layer of the pipeline after being continuously sprayed according to claim 1, wherein the power transmission rollers (9) in the first power transmission wheel area comprise ten groups, six groups of flexible belt power rollers (3) are arranged between the first spraying station area and the second spraying station area, and the second power transmission wheel area comprises ten groups of power transmission rollers (9).

4. The system for forming the plastic protective layer wound on the insulating layer of the pipeline after continuous spraying according to claim 1, wherein the distance between the alarm line online wiring device (6) and the first polyurethane foam spraying gun (7) is 1500mm, and the distance between the alarm line online wiring device (6) and the second polyurethane foam spraying gun (4) is 6000 mm.

5. A plastic protection layer winding forming process after continuous spraying of a pipeline heat-insulating layer is characterized in that a steel pipe (8) passes through a first polyurethane foam spraying gun (7) on a power transmission roller (9) in a spiral advancing mode, the first polyurethane foam spraying gun (7) sprays a coating to the surface of the steel pipe (8) to form a middle foam layer spraying pipeline (5), the middle foam layer spraying pipeline (5) is driven by a flexible belt power roller (3) to be conveyed to an alarm line online wiring device (6) in a spiral advancing mode, the alarm line online wiring device (6) lays alarm lines on the surface of the middle foam layer spraying pipeline (5), then the middle foam layer spraying pipeline (5) continuously transmits to a second polyurethane foam spraying gun (4), the second polyurethane foam spraying gun (4) sprays foam materials to the surface of the middle foam layer spraying pipeline (5), and covers the alarm lines to form a final foam layer pipeline (1), and finally, the foam layer pipeline (1) is continuously conveyed to a first pipe conveying trolley (2) under the action of a flexible power roller (3), the first pipe conveying trolley (2) conveys the final foam layer pipeline (1) to a foam curing station (10) to cure the foam layer, the cured final foam layer pipeline (1) is conveyed into a power transmission roller (9) through a second pipe conveying trolley (11) and conveyed to an extruding machine (13) in a spiral advancing mode, the extruding machine (13) extrudes hot belts to be wound to fully coat the final foam layer pipeline (1), the hot belts continue to advance to a water cooling area under the action of the power transmission roller (9) to be cooled, and a polyethylene protective layer is formed on the surface of the final foam layer pipeline (1).

6. The forming process of the plastic protective layer wound after the continuous spraying of the pipe insulation layer according to claim 5, wherein the polyethylene protective layer and the foam layer are cut and separated together by a special cutting tool after water cooling to form a single insulation pipe, and the finished pipe is formed after trimming at a trimming station.

7. The forming process of the plastic protective layer wound on the pipeline insulating layer after continuous spraying according to claim 5, wherein the foam layer on the pipeline (5) with the middle foam layer sprayed is 10cm, the foam layer on the pipeline (1) with the final foam layer is 40-100 mm, and the curing time of the foam curing station (10) is 30 minutes.

8. The forming process of winding plastic protective layer after continuous spray coating of pipe insulation layer according to claim 5, characterized in that the diameter of the steel pipe (8) is 1000-1620 mm, or the weight per meter is more than 1 ton.

Technical Field

The invention belongs to the technical field of forming of composite structures of pipeline anticorrosion and heat insulation layers, and particularly relates to a winding forming system and process for a steel pipeline insulation layer after continuous spraying.

Background

The long-distance conveying pipelines in town central heating, central cooling and crude oil industry all adopt a composite structure that steel pipelines are coated with hard foamed plastics as a heat preservation layer and a protective layer, the best forming mode is a spraying winding method, and the existing modes are as follows: the method has the advantages that the method completely meets the requirements of heat preservation layer forming of heavy load (the weight per meter reaches 1 ton), large-diameter pipelines (the diameter reaches phi 1620 mm) and thick foam layers (100 mm), has the disadvantages that material guns are required to be opened and closed in advance at the distance from the head end and the tail end of a steel pipe in the process of spraying polyurethane materials, the phenomenon of spray gun empty spraying is formed, material waste and environmental pollution are caused, and the installation of an alarm line requires a secondary foam layer to be carried out on a discontinuous line spraying line after a special station is laid. Secondly, winding and forming after continuous spraying (Chinese patents CN 208392700U and CN 209920572U), connecting the tail ends of the pipe heads of the steel pipes to be sprayed, continuously transmitting the tail ends of the pipe heads to pass through a foam spraying station, and continuously completing the foam layer spraying and forming of a single pipeline, and has the advantages of reducing material waste and reducing environmental pollution, and the defects that the spraying station adopts an inflatable roller or a soft rubber roller with certain hardness, the strength and the curing degree of the foam layer formed after spraying are low, the initial contact surface with the roller is linear, even if deformation occurs, the pressure of the contact position coating is strong because of the hardness and the lower contact area of the contact roller, when the unit weight of the steel pipe is too large or the thickness of the foam layer is too thick, the foam layer can be damaged under the extrusion of the roller, so the mode can only be applied to the pipeline with light unit load (the diameter of the pipeline is not more than phi 820 mm) and, and the laying mode of the alarm line is not determined in the patent, so that the process defect is caused.

Disclosure of Invention

The invention aims to provide a spraying and winding forming system and a spraying and winding forming process after continuous spraying of a steel pipeline heat-insulating layer, which can meet the technical requirements of forming heavy-load steel pipes or ultra-thick foam layers and can reduce the waste of spraying materials and environmental pollution.

In order to realize the purpose, the invention adopts the technical scheme that: the system for continuously spraying and winding the heat-insulating layer for the anticorrosion of the pipeline sequentially comprises a first power transmission wheel area, a first spraying station area, an alarm line laying area, a second spraying station area, a flexible belt type power roller area, a foam curing area, a second power transmission wheel area, a polyethylene outer protective layer winding area and a water cooling area, wherein the first power transmission wheel area and the second power transmission wheel area are provided with a plurality of power transmission rollers, the first spraying station area is provided with a first polyurethane foam spraying gun, the alarm line laying area is provided with an alarm line online wiring device, the second spraying station area is provided with a second polyurethane foam spraying gun, the first spraying station area, the alarm line laying area and the second spraying station area are provided with a plurality of flexible belt type power rollers, and the flexible belt type power roller area is provided with a plurality of flexible belt type power rollers, the flexible belt type power roller area is provided with a first pipe conveying trolley, a second pipe conveying trolley is arranged below the second power transmission wheel area, the polyethylene outer protective layer winding area is provided with a plastic extruding machine and a rubber rolling roller, and the water cooling area is provided with a water cooling system.

In the above scheme, the flexible belt power roller and the power transmission roller are both driven by the drive reducer, and the contact area between the flexible belt power roller and the foam layer is larger than that between the power transmission roller and the steel pipe.

In the scheme, the power transmission roller wheels of the first power transmission roller wheel area are ten groups in total, six groups of flexible belt power roller wheels are arranged between the first spraying station area and the second spraying station area, and the second power transmission roller wheel area is ten groups in total.

In the above scheme, the online wiring device of alarm line is 1500mm apart from first polyurethane foam spray gun, the online wiring device of alarm line is 6000mm apart from second polyurethane foam spray gun.

The invention also provides a process for continuously spraying, winding and forming the insulating layer of the anti-corrosion heat-insulating layer of the pipeline, which comprises the following steps: the steel pipe passes through a first polyurethane foam spraying gun in a spiral advancing mode on a power transmission roller, the first polyurethane foam spraying gun sprays the coating on the surface of the steel pipe to form a middle foam layer spraying pipeline, the middle foam layer spraying pipeline is conveyed to an alarm line online wiring device in a spiral advancing mode under the driving of a flexible belt power roller, the alarm line online wiring device lays an alarm line on the surface of the middle foam layer spraying pipeline, the middle foam layer spraying pipeline continuously transmits to a second polyurethane foam spraying gun, the second polyurethane foam spraying gun sprays foam materials on the surface of the middle foam layer spraying pipeline to cover the alarm line to form a final foam layer pipeline, the final foam layer pipeline is continuously conveyed to a first pipe conveying trolley under the action of the flexible belt power roller, and the first pipe conveying trolley conveys the final foam layer pipeline to a foam curing station to cure the foam layer, and the corona treatment belt is wound on the surface of the foam, the cured final foam layer pipeline is sent into the power transmission roller wheel through the second pipe conveying vehicle and is conveyed to the plastic extruding machine in a spiral advancing mode, the extrusion heat belt of the plastic extruding machine is wound to completely coat the final foam layer pipeline, the final foam layer pipeline continuously advances to a water cooling area in a spiral mode under the action of the power transmission roller wheel for water cooling, and a polyethylene protective layer is formed on the surface of the final foam layer pipeline 1.

In the scheme, the polyethylene protective layer and the foam layer are cut and separated together by the water-cooled special cutting tool to form a single heat-insulating pipe, and a finished pipe is formed after trimming at the trimming station.

In the scheme, the foam layer on the middle foam layer spraying pipeline 5 is 10cm, the foam layer on the final foam layer pipeline 1 is 40-100 mm, and the curing time of the foam curing station 10 is 30 minutes.

In the scheme, the diameter of the steel pipe 8 is 1000-1620 mm, or the weight per meter is more than 1 ton.

The advantages and the beneficial effects of the invention are as follows: 1. the invention meets the requirements of large, medium and small-caliber steel pipes, is suitable for coating and forming the foam heat-insulating layer of the steel pipe with the diameter of less than 1420mm and the steel pipe with the diameter of 1620mm heavy load. 2. The invention has the advantages of reducing foam splashing and material waste of air spraying and greatly reducing environmental pollution of the continuous foam spraying winding process, has the spraying forming advantages of satisfying the pipe diameter of more than 1420mm and thickening foam layer in the discontinuous spraying winding method, and can completely satisfy the pipe diameter requirement of discontinuous production and the energy-saving and environment-friendly requirements in the original continuous production for small, medium and large-caliber and heavy-duty steel pipes by one set of device. 3. The flexible belt power roller is in surface contact with the middle foam layer spraying pipeline and the final foam layer pipeline, so that the contact area between the formed foam layer and the flexible belt power roller is increased, the pressure intensity borne by the foam layer is reduced, the bearing capacity of the foam layer is improved, the foam layer can adapt to heavier pipeline weight and larger pipeline diameter, the rubbing and rolling of the foam layer and the extrusion damage are reduced, and the yield is improved. 4. And the alarm line is arranged on line, so that the production line efficiency of the heat preservation pipe is improved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

FIG. 2 is an elevational view of the flexible powered roller transmission pipeline of FIG. 1.

Fig. 3 is a front view of fig. 2.

In the figure: 1 final foam layer pipeline, 2 first fortune pipe dolly, 3 flexible band power gyro wheels, 4 second polyurethane foam spraying guns, 5 middle foam layer pipeline that spouts, 6 alarm line on-line wiring device, 7 first polyurethane foam spraying guns, 8 steel pipes, 9 power transmission gyro wheels, 10 foam curing stations, 11 second fortune pipe dolly, 13 extruding machines, 14 polyethylene film, 15 rubber rolls the roller, 16 water cooling system, 17 winding polyethylene pipeline, 19 transmission speed reducers.

Detailed Description

The technical solution of the present invention will be described in more detail with reference to the accompanying drawings.

The technological process of the embodiment comprises the steps of primary spraying of the polyurethane foam layer, alarm line wiring, secondary spraying of the polyurethane foam layer, curing, hot winding of the polyethylene protective layer, rolling and cooling. And (3) product forming process: the steel pipe is connected at the head position and continuously transmitted through a power transmission roller to finish the primary polyurethane foam spraying, the polyurethane foam is continuously transmitted on a flexible belt pulley after a primary foam layer is formed, an alarm line is installed at the position of an alarm line tool, and the polyurethane secondary spraying covers the alarm line to form a pipeline continuous foam layer with the final thickness; and (3) the pipelines cured in the curing area are in end-to-end connection transmission on a winding transmission wheel to finish the extrusion hot winding of the polyethylene outer protective layer plastic extruding machine, and the hot belt layer is rolled by a rubber roller and cooled to finish the continuous winding molding.

The rollers required by the process and formed by the pipeline conveying roller way are divided into common power transmission rollers 9 (inner stamping or soft rubber) and flexible belt power rollers 3, so that multiple groups of power transmission rollers 9 and flexible belt power rollers 3 borne by a single pipeline provide uniform power through a transmission speed reducer 19 respectively to drive the borne pipeline to rotate, the angle of the single group of rollers can be deflected and adjusted, the deflected rollers and the pipeline form a tangential angle in the pipeline conveying process, and the pipeline is driven to rotate automatically and move forwards. The alarm line wiring device of online installation adjusts according to the pipe diameter size, can install 2 groups or 4 groups of alarm line wheels, and the alarm line wheel is rotatory at the pipeline circumferencial direction according to the rotation speed of pipeline to the line wheel is static for the line ball position when alarm line lays on the pipeline, ensures that the alarm line is parallel with the pipeline axis, and the unwrapping wire is put while rotatory.

The technical scheme of the invention is further explained by combining the accompanying drawings as follows: as shown in fig. 1-3, a continuous spraying and winding process for an anticorrosion and heat-insulating layer of a steel pipeline, which initially works: the opening degree and the deflection angle of the power transmission roller 9 and the flexible belt power roller 3 are adjusted to adapt to the consistency of the center heights of the steel pipe 8, the middle spray foam layer pipeline 5 and the final foam layer pipeline 1 which pass through respectively and the consistency of the angular speeds during rotation, and the opening degree and the angle of the power transmission roller 9 are adjusted to adapt to the transmission of the final foam layer pipeline 1 and the wound polyethylene pipeline 17. The process route is that a power transmission roller 9 with a steel pipe 8 is started to continuously convey the steel pipe 8 through a first foam spraying gun 7, spraying foam forms an intermediate foam layer spraying pipeline 5 on the steel pipe 8, the intermediate foam layer spraying pipeline 5 is conveyed on a flexible powered roller 3, an alarm line is laid and pressed through an alarm line online wiring device 6, the intermediate foam layer spraying pipeline 5 is conveyed to a second foam spraying gun 4 on the flexible powered roller 3 to spray foam to form a final foam layer pipeline 1, the final foam layer pipeline 1 is conveyed to a first pipe conveying trolley 2 through the flexible powered roller 3, the first pipe conveying trolley 2 conveys the final foam layer pipeline 1 to a foam curing station 10, the cured final foam layer pipeline 1 is conveyed to the power transmission roller 9 through a second pipe conveying trolley 11, the power transmission roller 9 spirally drives the final foam layer pipeline 1 to be conveyed to an extrusion station of an extruding machine 13, and winding a polyethylene film 14 on the surface of the foam layer, performing water cooling shaping through a rubber rolling roller 15 and a water cooling area 16 to form a polyethylene winding pipeline 17, cutting off the lower line to a lower pipe area, and trimming to obtain a finished product pipeline.

The examples of the present invention have been described in detail, but the description is only an example of the present invention for steel pipe sprayed with polyurethane and polyethylene protective layer winding, and should not be construed as limiting the scope of the present invention. The equivalent changes and improvements of the process and method according to the scope of the present invention and the selected pipes, other types of foam layer spray coating, other types of protective layers, etc. made by using the process are all within the scope of the present invention.