Production method and device of ultra-high molecular weight polyethylene lined composite pipe

A technology of ultra-high molecular weight polyethylene pipes, which is applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., can solve problems that affect product quality and efficiency, short service life of oil pipes, waste of manpower and financial resources, etc., and achieve improvement Effects of production quality and productivity, shortened process, and high work efficiency

Active Publication Date: 2016-08-24
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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  • Production method and device of ultra-high molecular weight polyethylene lined composite pipe

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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: Clean the steel pipe to be clad with dust, and remove the buckles at both ends;

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

[0021] c, composite: put the ultra-high molecular weight polyethylene pipe obtained in step b into the steel pipe in step a immediately;

[0022] d. Stress relief: place the composite pipe obtained in step c for 22 to 26 hours to restore the stress, the rebound of the polyethylene pipe and the inner wall of the steel pipe are tightly bonded, and the temperature is kept at 70°C to 90°C for 1.5 to 3 hours to remove the stress and finaliz...

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: Clean the 60mm-diameter steel pipe to be composited, and remove the buckles at both ends;

[0028] b. Material selection: select ultra-high molecular weight polyethylene pipes with a diameter of 64mm, and shrink them to 58mm with a diameter reducing machine; then clean the ultra-high molecular weight polyethylene pipes after diameter reduction; the rollers of the diameter reducing machine are in order For: 64mm, 63mm, 62mm, 60mm, 59mm, 58mm;

[0029] c, composite: put the ultra-high molecular weight polyethylene pipe obtained through 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 restore the stress, so that the polyethylene pipe rebounds and closely adheres to the inner wall of the steel pipe, and the...

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: Use a cleaning machine to clean the steel pipe to be clad with a diameter of 73 mm, and remove the buckles at both ends;

[0036] b. Material selection: Select an ultra-high molecular weight polyethylene pipe with a diameter of 81mm, and shrink it to 72mm with a diameter reducing machine; then clean the ultra-high molecular weight polyethylene pipe after the diameter reduction; the size of the rollers of the diameter reducing machine is sequential 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 a compound mold machine for compounding;

[0038] d. Stress relief: place the composite pipe obtained in step c for 24 hours to restore the st...

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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 device of ultra-high molecular weight polyethylene-lined composite pipes. Background technique [0002] As a consumable in the development fields such as oil and natural gas exploration, oil pipe plays a pivotal role. Existing oil pipes are generally made of steel materials. Due to friction and corrosion during use, the service life of oil pipes is short and the replacement cycle is short. Generally, oil pipes made of steel materials often accumulate wax on the inner wall after being used for a period of time, and scaling will occur over time, resulting in narrowing of the inner diameter of the oil pipe. It needs to be stopped and cleaned regularly, 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, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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