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Ultrahigh molecular weight polyethylene lining composite pipe production method and device

A technology of ultra-high molecular weight polyethylene pipes, which is applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., which can solve problems affecting product quality and efficiency, waste of manpower and financial resources, and short service life of oil pipes, etc., to improve Production quality and production efficiency, high work efficiency, and the effect of shortening the process

Active Publication Date: 2015-04-22
大庆高新区法尔文得新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing oil pipes are generally made of steel materials. Due to friction and corrosion during use, the service life of the oil pipes is short and the replacement cycle is short
Generally, after a period of use, oil pipes made of steel materials often accumulate wax on the inner wall, and scaling will occur over time, resulting in narrowing of the inner diameter of the oil pipe, requiring regular parking and cleaning, which reduces production efficiency
In order to solve the above problems, the existing method is to apply a coating on the inner wall of the oil pipe. However, it is difficult to clean the inner wall of the oil pipe, so the adhesion of the coating is very low and it is easy to fall off.
The ultra-high molecular weight polyethylene-lined composite pipe is developing rapidly at present, but due to many processing links, the current production equipment and methods have poor production continuity, resulting in serious disconnection in the production process, and waste due to the disconnection of various links. A lot of manpower and financial resources make the production cost higher
In addition, the existing preparation process is relatively primitive, that is, the injection molding process, which makes the inner liner easy to peel off and fall off, seriously affecting the quality and efficiency of the product

Method used

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  • Ultrahigh molecular weight polyethylene lining composite pipe production method and device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production method of the ultra-high molecular weight polyethylene lined composite pipe of the present invention is realized through the following steps:

[0019] a. Pretreatment: dust and clean the composite steel pipe, and remove the protective buckles at both ends;

[0020] b. Material selection: select an ultra-high molecular weight polyethylene pipe with a diameter of 3-9mm larger than the inner diameter of the steel pipe in step a, and shrink the diameter to 1 to 2mm less than the inner diameter of the steel pipe;

[0021] c. Compound: Put the ultra-high molecular weight polyethylene pipe obtained in step b into the steel pipe of step a immediately;

[0022] d. Stress relief: Put the composite pipe obtained in step c for 22 to 26 hours to recover the stress, the polyethylene pipe rebounds and closely adheres to the inner wall of the steel pipe, and the temperature is 70°C to 90°C for 1.5 to 3 hours to remove the stress and form the composite. complete;

[0023] e. Cut-t...

Embodiment 2

[0026] The production method of the ultra-high molecular weight polyethylene lined composite pipe of the present invention is realized through the following steps:

[0027] a. Pretreatment: Dust and clean the composite steel pipe with a diameter of 60mm, and remove the protective buckles at both ends;

[0028] b. Material selection: select an ultra-high molecular weight polyethylene pipe with a diameter of 64mm, shrink the diameter to 58mm with a diameter reducing machine; then clean the reduced diameter ultra-high molecular weight polyethylene pipe; For: 64mm, 63mm, 62mm, 60mm, 59mm, 58mm;

[0029] c. Compound: Put the ultra-high molecular weight polyethylene pipe obtained in step b into the steel pipe of step a immediately;

[0030] d. Stress relief: Place the composite pipe obtained in step c for 23 hours to recover the stress, make the polyethylene pipe rebound and closely adhere to the inner wall of the steel pipe, and hold it at a temperature of 70°C to 90°C for 2 hours to remov...

Embodiment 3

[0034] The production method of the ultra-high molecular weight polyethylene lined composite pipe of the present invention is realized through the following steps:

[0035] a. Pretreatment: The 73mm diameter composite steel pipe to be compounded is cleaned with a washing machine, and the protective buckles at both ends are removed;

[0036] b. Material selection: select an ultra-high molecular weight polyethylene pipe with a diameter of 81mm, shrink the diameter to 72mm with a diameter reducing machine; then clean the reduced diameter ultra-high molecular weight polyethylene pipe; the roller size of the diameter reducing machine is in turn For: 81mm, 80mm, 78mm, 76mm, 74mm, 72mm;

[0037] c. Compounding: Put the ultra-high molecular weight polyethylene pipe obtained in step b into the steel pipe obtained in step a immediately and put it into the compound mold machine for compounding;

[0038] d. Stress relief: Put the composite pipe obtained in step c for 24 hours to recover the stres...

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Abstract

The invention discloses an ultrahigh molecular weight polyethylene lining composite pipe production method and device, and relates to the field of composite pipe production method and device equipment. The ultrahigh molecular weight polyethylene lining composite pipe production method comprises the steps of pretreatment, material selection, composition, destressing, constant length cut and flanging. The ultrahigh molecular weight polyethylene lining composite pipe production device is characterized in that an outlet of a size reducing machine is provided with a lining pipe conveying device to be connected with one inlet of a cleaning machine, the other inlet of the cleaning machine is provided with a steel pipe conveying device, the cleaning machine is provided with a lining pipe outlet and a steel pipe outlet which are connected with corresponding inlets of a composite mold machine, the composite mold machine, a placement table, a heating box, a constant length cutting machine, a flanging machine and a coupling screw-on machine are connected in sequence, and a composite pipe conveying device is arranged between every two adjacent devices. The ultrahigh molecular weight polyethylene lining composite pipe production method is simple, the lining composition effect is good, the phenomenon that an outer pipe is stripped or disengaged from an inner pipe is avoided, the technological difficulty degree is low, working efficiency is high, the product percent of pass is high, the product quality is improved, the product has the ultrahigh wear resistance, and manufactured composite pipes are long in using period.

Description

Technical field [0001] The invention relates to the field of production methods and production equipment of composite pipes, in particular to a production method and equipment of ultra-high molecular weight polyethylene lined composite pipes. Background technique [0002] As a consumable in oil and natural gas exploration and development fields, tubing plays a pivotal role. The existing oil pipes are generally made of steel materials. Due to friction and corrosion during use, the oil pipes have a shorter service life and shorter replacement periods. Generally, steel tubing will often be waxed on the inner wall after a period of use, and scaling will occur over time, resulting in a narrowing of the tubing inner diameter, which requires regular shutdown and cleaning, which reduces production efficiency. In order to solve the above problems, the existing method is to coat the inner wall of the oil pipe with a coating. However, the inner wall of the oil pipe is difficult to clean, s...

Claims

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Application Information

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IPC IPC(8): F16L9/147
CPCF16L9/147
Inventor 王宗祥朱晓云杨寒冬金荣芳王丽红
Owner 大庆高新区法尔文得新材料有限公司
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