CN101463932B - A polyethylene hollow winding structural wall composite steel pipe and its processing technology - Google Patents

Abstract

The invention relates to a polyethylene hollow wound structure wall composite steel pipe. A polyethylene anticorrosive coating is arranged on the outer wall of the steel pipe body, and resin glue bonding layer is coated between the polyethylene anticorrosive coating and the outer wall of the steel pipe body. The innovation point of the composite steel pipe is as follows: the outer part of the polyethylene anticorrosive coating is wound with a tubular hollow structure polyethylene spiral rib. The composite steel pipe has the outstanding advantages of scientific and reasonable structure design, high loop stiffness, material saving, easy mounting, reasonable price and the like. A polyethylene thermal state winding forming process is adopted in the machining process of the polyethylene hollow wound structure wall composite steel pipe, a sheet tape and a tubular hollow tape are extruded and prepared by a plastic extruding machine, and the sheet tape and the hollow tape are wound in parallel, thus the polyethylene anticorrosive coating and the tubular hollow structure polyethylene spiral rib are prepared by thermal state integrated forming. The composite steel pipe has the advantages of high quality of welded joints, simple process, low equipment investment, low cost and the like; meanwhile, the machining process can help save much polyethylene raw materials.

Description

A polyethylene hollow winding structural wall composite steel pipe and its processing technology

technical field

The invention belongs to the technical field of steel pipe processing, in particular to a polyethylene hollow winding structural wall composite steel pipe and its processing technology.

Background technique

For a long time, most of the urban water supply and gas supply networks have used steel pipes as the pipes for the transmission medium, but the traditional steel pipes are single-layer steel pipe structures, which have many disadvantages in engineering applications, mainly reflected in low strength, rough walls, Easy to corrode, short service life, etc. Therefore, in order to overcome the shortcomings of the above-mentioned single-layer steel pipes, the improved steel pipes are made of composite steel pipes with plastic anti-corrosion layers, which have the advantages of high strength, smooth wall surface, corrosion resistance, etc., so they are widely used in engineering, but this This kind of structural composite steel pipe has the disadvantages of large pipe wall thickness and heavy pipe, which makes the composite steel pipe prone to instability and increases the difficulty of construction. In the field of existing high-density polyethylene plastic pipe processing, the thermal winding method has been used to produce polyethylene spiral reinforcement ribs on the outer peripheral surface of the pipe wall, thereby improving the rigidity of the pipe ring and solving the problem of instability, but The above-mentioned plastic pipes made of polyethylene convex spiral reinforcement ribs on the pipe wall are all solid ribs. If they are used in the field of steel pipes, they will further increase the thickness and weight of the pipe wall, thereby increasing the construction cost and difficulty, and are not suitable for steel pipes. At the same time, there are also shortcomings such as large polyethylene consumption and high production costs, which are not conducive to the improvement of the economic benefits of enterprises.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a polyethylene hollow winding structural wall composite steel pipe with hollow structural spiral ribs on the outer wall of the steel pipe, which has high strength, small wall thickness, light weight, and is convenient for construction. Low cost and other outstanding advantages; at the same time, it also provides a processing technology for polyethylene hollow winding structure wall composite steel pipe, which adopts polyethylene thermal winding forming production technology to integrally process polyethylene spiral ribs with tubular hollow structure on the outer wall of the pipe, with The process is simple, raw materials are saved, and the quality of the weld seam is high.

A polyethylene hollow winding structure wall composite steel pipe, in which a polyethylene anti-corrosion layer is formed on the outer wall of the steel pipe body, and a resin glue bonding layer is coated between the polyethylene anti-corrosion layer and the outer wall of the steel pipe body, and the feature is that: the polyethylene anti-corrosion layer The exterior is wound with tubular hollow structural polyethylene spiral ribs.

Moreover, an inner plastic layer is evenly sprayed on the inner wall of the steel pipe body.

Moreover, the cross-sectional shapes of the polyethylene spiral ribs of the tubular hollow structure are circular tubes, square tubes, trapezoidal tubes, and triangular tubes.

A processing technology for polyethylene hollow winding structural wall composite steel pipe, including sand blasting treatment on the outer wall of the pipe and resin glue coating on the outer wall of the pipe, characterized in that the process also includes the following steps: while the resin glue is being applied, the plastic machine will Extruded flat strips and tubular hollow strips are evenly wound side by side on the outer wall of the pipe coated with resin glue according to the predetermined position, and the polyethylene anti-corrosion layer and the tubular hollow structure spiral ribs are thermally formed at one time.

Moreover, after the polyethylene anticorrosion layer and the tubular hollow structure spiral ribs are hot-formed once, a step of spraying the inner plastic layer on the inner wall of the pipe is also included.

Moreover, the cross-sectional shapes of the tubular hollow strips extruded by the extruder are circular tubes, square tubes, trapezoidal tubes, and triangular tubes.

Advantage and positive effect of the present invention are:

1. The polyethylene hollow winding structure wall composite steel pipe adopts the polyethylene spiral rib with tubular hollow structure as the reinforcement of the composite steel pipe. Compared with the solid spiral rib, the wall thickness of the steel pipe can be reduced by about 30%, and the steel pipe can be lightened. The weight is about 20%, thus greatly reducing the labor intensity of construction.

2. The polyethylene hollow winding structure wall composite steel pipe adopts the spiral rib with hollow structure as the reinforcing rib of the composite steel pipe. On the basis of meeting the minimum wall thickness required by the pressure of the conveying medium, the rigidity of the pipe ring is guaranteed to avoid pipe failure. It is stable and has root resistance at the same time, which solves the problem of longitudinal displacement of the pipeline.

3. The structural design of the polyethylene hollow winding structural wall composite steel pipe is scientific and reasonable, combining the high strength and high elastic modulus of steel with polyethylene light weight, small resistance coefficient, corrosion resistance, strong water delivery capacity, good sealing performance, and easy to use The respective advantages of long life, convenient transportation and installation, and fast construction speed are integrated into one. It has outstanding advantages such as high ring rigidity, material saving, easy installation, and moderate price. Conducive to improving drinking water quality and people's health level.

4. The polyethylene hollow winding structure wall composite steel pipe processing technology adopts the polyethylene hot winding molding process, extrudes the flat material belt and the tubular hollow material belt through the extruder, and carries out the parallel winding of the flat material belt and the hollow material belt, by The polyethylene anti-corrosion layer and the tubular hollow structure polyethylene spiral ribs are integrally formed in this hot state, which has the advantages of high quality welded joints, simple process, small equipment investment, and low cost. At the same time, this processing technology can save a lot of polyethylene raw materials. Quantity, further reduce production costs, improve the economic efficiency and competitiveness of enterprises.

Description of drawings

Fig. 1 is the structural representation of polyethylene hollow winding structure wall composite steel pipe of the present invention (the cross section of spiral rib is circular);

Fig. 2 is the structural representation of polyethylene hollow winding structure wall composite steel pipe of the present invention (the cross section of spiral rib is square);

Fig. 3 is the structural representation of polyethylene hollow winding structural wall composite steel pipe of the present invention (the cross-section of the spiral rib is trapezoidal);

Fig. 4 is a structural schematic diagram of a polyethylene hollow wound structure wall composite steel pipe of the present invention (the cross section of the spiral rib is triangular).

Detailed ways

The present invention will be further described in detail through specific embodiments below in conjunction with the accompanying drawings. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

A polyethylene hollow winding structure wall composite steel pipe, in which a polyethylene anti-corrosion layer 2 is formed on the outer wall of the steel pipe body 4, and a resin glue bonding layer 3 is coated between the polyethylene anti-corrosion layer and the outer wall of the steel pipe body. The polyethylene anti-corrosion layer is wound with tubular hollow polyethylene spiral ribs 1. The cross-sectional shapes of the spiral ribs are circular tubes, square tubes, trapezoidal tubes, and triangular tubes, as shown in Figure 1-4. It is a tubular hollow structure of any other shape. An inner plastic coating layer 5 is formed on the inner wall of the steel pipe body, and the inner plastic coating layer is a polyurea layer, which can improve the smoothness of the inner wall of the steel pipe body and has an anti-corrosion function.

The production process of polyethylene hollow winding structural wall composite steel pipe of the present invention comprises the following steps:

(1).Sandblasting the wall surface of the pipe body;

(2).Using the polyethylene thermal winding molding process, the flat material belt and the tubular hollow material belt extruded from the die of the extruder are evenly wound side by side on the outer wall of the tube coated with resin glue according to the predetermined position, and the flat material The tape is wound before the tubular hollow material tape, and the tubular hollow material tape is wound on the melt seam formed after the flat material tape is wound, so that the outer layer of the composite steel pipe has a higher weld seam quality. The polyethylene anti-corrosion layer and the tubular hollow structure polyethylene spiral ribs are thermally formed at one time, and the pitch of the spiral rib tubes can be adjusted according to different engineering needs. The extruder adopts the double-channel extruder in the existing plastic pipe processing, and its flat die and tubular die extrude a flat strip and a tubular hollow strip respectively.

(3). Before the flat material tape is wound, the resin glue adhesive layer is applied on the outer wall of the pipe step by step, so as to realize the firm bonding between the polyethylene anti-corrosion layer and the outer wall of the pipe.

(4). Cool the pipe body after the polyethylene anti-corrosion layer and the tubular hollow polyethylene spiral rib are wound.

(5). After the polyethylene anti-corrosion layer and the tubular hollow structure spiral ribs are thermally formed, the inner wall of the pipe is sprayed with plastic to produce an inner plastic layer, which is a polyurea layer.

This processing technology adopts polyethylene thermal winding molding process, extrudes flat material belt and tubular hollow material belt through double-channel extruder, and winds them in parallel, so that polyethylene anti-corrosion layer and tubular hollow structure are integrally formed in thermal state Polyethylene spiral ribs have the advantages of small equipment investment, low cost, and simple process. At the same time, this processing technology can save a large amount of polyethylene raw materials, further reduce costs, and improve economic benefits and competitiveness of enterprises.

Claims (3)

1. polyethylene hollow winding structure composite steel tube processing technology, comprise tube wall sand blast, the coating of tube wall resin glue, it is characterized in that: this technology is further comprising the steps of: in the resin glue coating simultaneously, will by extruder make flat strip and cannulated strip by the precalculated position side by side uniform winding scribbling on the tube wall of resin glue polyethylene anticorrosive coating and the hot once-through of cannulated structure polyethylene helical rib.

2. polyethylene hollow winding structure composite steel tube processing technology according to claim 1, it is characterized in that: after polyethylene anticorrosive coating and the hot once-through of cannulated structure polyethylene helical rib, also comprise the internal plastic coating layer spraying step of inboard wall of tube body.

3. polyethylene hollow winding structure composite steel tube processing technology according to claim 1, it is characterized in that: the sectional shape of the cannulated strip that described extruder is extruded is circular pipe, square tubular, laddertron or triangle tube.

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