CN210484952U

CN210484952U - Externally-coated steel-plastic composite wear-resistant elbow

Info

Publication number: CN210484952U
Application number: CN201921510185.5U
Authority: CN
Inventors: 杨明昆; 邹剑
Original assignee: Gongqing Chengrui Titanium Pipeline Technology Co Ltd
Current assignee: Gongqing Chengrui Titanium Pipeline Technology Co Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-08
Anticipated expiration: 2029-09-11

Abstract

The utility model relates to a pipeline connecting piece, in particular to an outer cladding steel-plastic composite wear-resistant elbow. The externally-coated steel-plastic composite wear-resistant elbow is formed by welding multiple sections of pipes which are arranged at a certain included angle, wherein each section of pipe comprises a plastic pipe, a heat insulation layer and a steel pipe, the heat insulation layer is wrapped outside the plastic pipe, and the steel pipe is tightly pressed outside the heat insulation layer through a crimping machine. The utility model discloses guaranteed that the inner wall internal diameter on inside plastic pipe material layer is completely unanimous with the pipeline internal diameter that its both ends are connected, and slurry or lotion are through the time, can not produce because of the whirl that leads to of inducing the menstrual flow mutation, greatly reduced the wearing and tearing of elbow.

Description

Externally-coated steel-plastic composite wear-resistant elbow

Technical Field

The utility model relates to a pipeline connecting piece, in particular to an outer cladding steel-plastic composite wear-resistant elbow.

Background

The steel-plastic composite pipe is made up by using general carbon steel pipe as base body and lining with thermoplastic plastic pipe with excellent chemical stability through cold-drawing compounding or rotational moulding, and features not only the mechanical properties of steel pipe, but also the corrosion resistance, slow scaling and uneasy growth of microbe. The existing process for manufacturing the connecting elbow of the steel-plastic composite pipe usually comprises the steps of firstly bending a steel pipe, then heating the bent pipe and simultaneously coating plastic on the inner wall of the bent pipe. The inner diameter of the elbow manufactured by the process can not reach the same as that of the steel-plastic composite pipe, the sudden change of the drift diameter can generate rotational flow, when slurry or paste is conveyed, the inner wall of the elbow is greatly abraded, and because the wall thickness of a plastic coating layer can only reach about 1mm, and wear-resistant materials (such as polyolefin elastomers) can not be processed by the plastic coating process, the inner wall of the elbow can not have the wear-resistant function at all, the elbow is only suitable for use scenes with low wear rate, and the service life of the pipeline can be greatly shortened when the abrasion is serious.

Disclosure of Invention

In order to solve the technical problem, the utility model provides an elbow with high wear resistance and corrosion resistance and a manufacturing process thereof.

The externally-coated steel-plastic composite wear-resistant elbow is formed by welding multiple sections of pipes which are arranged at a certain included angle, wherein each section of pipe comprises a plastic pipe, a heat insulation layer and a steel pipe, the heat insulation layer is wrapped outside the plastic pipe, and the steel pipe is tightly pressed outside the heat insulation layer through a crimping machine.

As a further technical scheme of the utility model, still fixed mounting has the flange on the steel pipe lateral wall tip.

As a further technical proposal of the utility model, the heat insulation layer is made of asbestos material.

As a further technical scheme of the utility model, two adjacent plastic tubular product inner wall seam crossing are convex excessive.

As a further technical scheme of the utility model, steel pipe outer wall cladding one deck heat shrink area or spraying paint layer carry out anticorrosive treatment.

As a further technical scheme of the utility model, the relative outer steel pipe's of plastic tubular product terminal surface on inlayer terminal surface indentation 1-3mm, the relative flange terminal surface indentation 1-3mm of terminal surface of steel pipe.

The manufacturing process of the externally coated steel-plastic composite wear-resistant elbow of the utility model comprises the following steps.

(1) The plastic pipe is coated with a layer of heat insulation layer.

(2) The plastic pipe coated with the heat insulation layer is sleeved in the steel pipe.

(3) And applying radial pressure to the steel pipe to press the steel pipe tightly on the heat insulation layer on the outer wall of the plastic pipe.

(4) And (4) cutting the pipe manufactured in the step (3) into a plurality of sections of pipes, then cutting and processing the end faces of the pipes at a certain angle relative to the radial section according to the turning angle required by the elbow, and respectively processing chamfers at the end heads of the steel pipes and the plastic pipes on the end faces of the pipes.

(5) And (4) connecting the outer walls of the two sections of pipes processed in the step (4) end to end, forming a steel pipe welding seam and an inner layer plastic pipe welding seam by chamfering at the connecting part, welding the outer layer steel pipe firstly, and then welding the inner layer plastic pipe.

(6) And (5) sequentially welding the residual pipes processed in the step (4) according to the method in the step (5), and finishing the manufacturing process of the whole elbow.

The heat insulation layer in the step (1) is made of asbestos materials. And (4) applying radial pressure to the steel pipe by using a withholding machine in the step (3). The welding step of the outer layer steel pipe in the step (5) is as follows: the inside of the welding seam is prewelded, and then the whole welding seam is fully welded. The welding step of the inner layer plastic pipe in the step (5) is as follows: firstly, carrying out surface heating treatment on a welding seam at the chamfer of the plastic pipe by using a hot air gun, then extruding the same plastic material in a molten state by using a plastic extrusion welding machine to fill the welding seam at the chamfer, and flattening to finish the welding of the inner-layer plastic pipe. And after all the welding is finished, welding a connecting flange at the end part of the elbow, and coating a layer of heat shrinkable tape or spraying paint on the outer wall of the outer layer steel pipe for corrosion prevention treatment. And grinding the inner plastic pipe at two ends of the elbow to enable the end face of the inner plastic pipe to retract 1-3mm relative to the outer steel pipe.

The utility model has the advantages as follows: the utility model discloses an innovation technology, directly with steel mould compound pipe cutting processing back according to certain angle welding forming again, the elbow of arbitrary angle can be made according to needs to this kind of technology, and the setting of insulating layer leads to plastic pipe to produce to warp because of the high temperature when can preventing to weld outside steel pipe, carries out the circular arc at plastic pipe seam crossing and handles, makes its smooth transition. The process and the structure ensure that the inner diameter of the inner wall of the inner plastic pipe layer is completely consistent with the inner diameter of the pipeline connected with the two ends of the inner plastic pipe layer, and when slurry or paste flows through, rotational flow caused by sudden change of the menstrual flow is avoided, so that the abrasion of the elbow is greatly reduced.

Drawings

Fig. 1 is a schematic structural view of the elbow of the present invention.

In the figure, a plastic pipe material a, a heat insulation layer b, a steel pipe c and a flange d.

Detailed Description

The technical solution of the present invention is explained in detail below with reference to the accompanying drawings and specific embodiments.

The first embodiment.

The utility model provides an outer cladding steel is moulded compound wear-resisting elbow, is arranged into the tubular product welding of certain contained angle by the multistage and forms, and every section tubular product includes plastic pipe a, insulating layer b, steel pipe c, the cladding of insulating layer b is outside plastic pipe a, steel pipe c cladding is outside insulating layer b, insulating layer b is the asbestos material, the relative outer steel pipe c's of plastic pipe a terminal surface indentation 1mm of inlayer.

Example two.

The externally-coated steel-plastic composite wear-resistant elbow is formed by welding a plurality of sections of pipes which are arranged at a certain included angle, wherein each section of pipe comprises a plastic pipe a, a heat insulation layer b and a steel pipe c, the heat insulation layer b is coated outside the plastic pipe a, and the steel pipe c is coated outside the heat insulation layer b. And a flange d is fixedly arranged on the outer side wall of the end part of the steel pipe c. The heat insulation layer b is made of asbestos materials, and the joint of the inner walls of the two adjacent plastic pipes a is in arc transition. The end face of the plastic pipe material a on the inner layer retracts 2mm relative to the end face of the outer layer steel pipe c, and the end face of the steel pipe c retracts 1mm relative to the end face of the flange d.

Example three.

The externally-coated steel-plastic composite wear-resistant elbow is formed by welding a plurality of sections of pipes which are arranged at a certain included angle, wherein each section of pipe comprises a plastic pipe a, a heat insulation layer b and a steel pipe c, the heat insulation layer b is coated outside the plastic pipe a, and the steel pipe c is coated outside the heat insulation layer b. And a flange d is fixedly arranged on the outer side wall of the end part of the steel pipe c. The heat insulation layer b is made of asbestos materials, the joint of the inner walls of the two adjacent plastic pipes a is in arc transition, the outer wall of the steel pipe c is coated with a heat shrinkable tape or a paint spraying layer for corrosion prevention treatment, the end face of the plastic pipe a on the inner layer is retracted 3mm relative to the end face of the steel pipe c on the outer layer, and the end face of the steel pipe c is retracted 2mm relative to the end face of the flange d.

Example four.

The end face of the steel pipe c retracts 3mm relative to the end face of the flange d, and other structures are the same as those of the embodiment.

Claims

1. The utility model provides an outer cladding steel is moulded compound wear-resisting elbow, is formed by the tubular product welding that certain contained angle was arranged into to the multistage, its characterized in that: each section of pipe comprises a plastic pipe (a), a heat insulation layer (b) and a steel pipe (c), wherein the heat insulation layer (b) wraps the plastic pipe (a), and the steel pipe (c) is pressed outside the heat insulation layer (b) through a pressing machine.

2. The externally-coated steel-plastic composite wear-resistant elbow according to claim 1, characterized in that: and a flange (d) is fixedly arranged on the end part of the outer side wall of the steel pipe (c).

3. The externally-coated steel-plastic composite wear-resistant elbow according to claim 1, characterized in that: the heat insulation layer (b) is made of asbestos materials.

4. The externally-coated steel-plastic composite wear-resistant elbow according to claim 1, characterized in that: the joint of the inner walls of the two adjacent plastic pipes (a) is in arc transition.

5. The externally-coated steel-plastic composite wear-resistant elbow according to claim 1, characterized in that: and (c) coating a layer of heat shrinkable tape or spraying a paint layer on the outer wall of the steel pipe for anticorrosion treatment.

6. The externally-coated steel-plastic composite wear-resistant elbow according to claim 2, characterized in that: the end face of the plastic pipe (a) on the inner layer retracts 1-3mm relative to the end face of the steel pipe (c) on the outer layer, and the end face of the steel pipe (c) retracts 1-3mm relative to the end face of the flange (d).