Novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line and production process

A prefabricated direct burial, production process technology, applied in the direction of tubular objects, other household appliances, household appliances, etc., can solve the problems of difficult detection, uneven density inside the polyurethane layer, many voids, etc., to avoid high manufacturing costs and improve products. quality, the effect of improving the cladding strength

Inactive Publication Date: 2019-05-10

BC P INC CHINA NAT PETROLEUM CORP +2

2 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The present invention solves the deficiencies of the prior art and provides a novel prefabricated direct-buried polyurethane spray-coated thermal insula...

Method used

Coating cooling: the polyurethane layer of pipe body is carried out water cooling by the mode of online spraying through the welded pipe that polyethylene layer is wound through coating cooling system 8, by coating cooling step, improved polyethylene layer and polyurethane The cladding strength between the layers and between the polyurethane layer and the pipe body;

Coating cooling: the polyurethane layer of pipe body is carried out water cooling through the welded pipe of polyethylene layer winding through coating cooling system 8 adopting the mode of online spraying, by coating cooling step, improved polyethylene layer and polyurethane The cladding strength between the layers and between the polyurethane layer and the pipe body;

Coating cooling: the polyurethane layer of pipe body is carried out water-cooling by the mode of on-line spraying through coating cooling system 8 through the welded pipe of polyethylene layer winding, by coating cooling step, improved polyethylene layer and polyurethane The cladding strength between the layers and between the polyurethane layer and the pipe body;

Preheating: welded pipe is preheated to temperature 20 ℃ by flame preheating furnace 1, makes shot blasting derusting effect better by flame preheating furnace preheating, makes rust energy come off more easily, adopts flame combustion to remove welded pipe surface combustible pollutants;

Preheating: welded pipe is preheated to temperature 30 ℃ by flame preheating furnace 1, makes shot blasting derusting effect better by flame preheating furnace preheating, makes rust energy come off more easily, adopts flame combustion to remove welded pipe surface combustible pollutants;

Preheating: welded pipe is preheated to temperature 40 ℃ by flame preheating furnace 1, makes shot blasting derusting effect better by flame preheating furnace preh...

Abstract

The invention discloses a novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line. The production line is composed of a flame preheating furnace, a shot blastingderusting machine, a pipe-inside blowing sweeping device, a polyurethane spraying system, a polyurethane layer rounding device, a polyurethane curing platform, a polyethylene winding system, a coating cooling system and a pipe end treating device which are arranged in proper sequence. The invention further discloses a novel prefabricated direct-buried polyurethane spraying heat-preservation pipeproduction process which comprises the steps of preheating, shot blasting, blowing sweeping, polyurethane spraying, rounding, curing, polyethylene layer winding, coating cooling and pipe end treating.By means of the novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line and the production process, the problems of uneven internal density, more cavities and detection difficulty of a polyurethane layer in existing heat-preservation pipe fabrication utilizing a pipe-in-pipe process are solved.

Application Domain

Tubular articles

Technology Topic

Manufacturing engineeringConductor Coil +7

Image

Examples

Experimental program(3)

Example Embodiment

[0034] Example one

[0035] A new type of prefabricated direct-buried polyurethane spray insulation pipe production line, see figure 1 , figure 2 The production line consists of a flame preheating furnace 1, shot blasting derusting machine 2, in-pipe purging device 3, polyurethane spraying system 4, polyurethane layer rounding device 5, polyurethane curing platform 6, polyethylene winding system 7 arranged in sequence , The coating cooling system 8 and the pipe end processing device 9 are composed of a new type of prefabricated direct-buried polyurethane spray insulation pipe production line of the present invention to realize the industrial automated production of polyurethane insulation pipes, which not only reduces labor intensity, but also improves production efficiency. .

[0036] A new type of production process for prefabricated direct-buried polyurethane sprayed thermal insulation pipe, the process includes the following steps:

[0037] Preheating: Preheat the welded pipe through the flame preheating furnace 1 to a temperature of 20℃. Preheating through the flame preheating furnace makes the shot blasting effect better and makes the rust easier to fall off. Flame combustion is used to remove combustible pollutants on the surface of the welded pipe. ;

[0038] Shot blasting: The preheated welded pipe is derusted on the outer surface of the pipe through the shot blasting machine 2, and the weld slag and burrs on the outer surface of the welded pipe are removed through the shot blasting step to ensure the cleanliness and dust of the welded pipe surface Control the cleanliness of the welded pipe surface to reach the level Sa2 specified in GB/T 8923 and the depth of the anchor pattern to reach 60μm;

[0039] Blowing: Pass the shot blasted welded pipe through the pipe cleaning device 3 to blow the rust, residual steel shot and steel grit on the inner wall of the welded pipe into the dust collecting box, so that the inner wall of the pipe is free of debris, and the outer surface of the welded pipe is not dusty. Lower than the level 1 specified in GB/T18570.3;

[0040] Polyurethane spraying: The purged welded pipe is lifted by the spraying trolley and then rotated into the polyurethane spraying system 4 to spray polyurethane foam. When the polyurethane spraying system 4 detects the head of the welded pipe, it starts to spray polyurethane foam. The spraying volume is 80g/s and the spraying pressure is 110kg/m, control the polyurethane coating density to reach 60kg/m3 or more, control the compressive strength to 0.35MPa, spray protection on the surface of 150mm at both ends of the welded pipe head, the polyurethane layer foam thickness of the polyurethane insulation pipe of the present invention can be selected according to needs , Without being restricted by the size of the polyethylene layer;

[0041] Rounding: Use the polyurethane rounding device 5 to trim the polyurethane layer of the welded pipe after polyurethane spraying. The rounding step ensures that the polyurethane layer has a uniform thickness in the circumferential direction of the steel pipe;

[0042] Maturation: Place the rounded welded pipe on the polyurethane curing platform 6 by using a tube trolley for maturing. The curing time is 600s, and the lifting height of the tube trolley is 500mm. The polyurethane foam on the surface of the tube should not be significantly deformed during transportation;

[0043] Polyethylene layer winding: the cured welded pipe is wound with polyethylene layer through the polyethylene winding system 7, using a high-power SJ220 extruder, using a narrow die to extrude and then rotating and winding to control the total thickness of the polyethylene layer to 3.5mm, The width of the bottom polyethylene layer is 100mm, and the polyethylene layer is superimposed, and the width of the superimposed layer is 30mm;

[0044] Coating cooling: the welded pipe wrapped by the polyethylene layer is passed through the coating cooling system 8 to water-cool the polyurethane layer of the pipe body by means of online spraying. The coating cooling step improves the gap between the polyethylene layer and the polyurethane layer. And the coating strength between the polyurethane layer and the pipe body;

[0045] Pipe end treatment: The welded pipe after coating cooling is cut off the polyethylene layer within 100mm of the pipe end through the pipe end treatment device 9, and the polyurethane layer cannot leak outside.

[0046] The prefabricated direct-buried polyurethane sprayed thermal insulation pipe produced by the present invention first sprays polyurethane foam to form a polyurethane layer, and then winds the polyethylene layer to form a polyethylene layer, which solves the problem that the internal density of the polyurethane layer is different when the thermal insulation pipe is manufactured by the existing pipe-in-pipe process. The problems of uniformity, many cavities, and difficult to detect, while avoiding the problems of high product manufacturing cost, large engineering investment, long production and construction periods in the traditional pipe-in-pipe production process, thereby improving the product quality and reliability of prefabricated insulation pipes Performance and service life.

Example Embodiment

[0047] Example two

[0048] A new type of prefabricated direct-buried polyurethane spray insulation pipe production line, see figure 1 , figure 2 The production line consists of a flame preheating furnace 1, shot blasting derusting machine 2, in-pipe purging device 3, polyurethane spraying system 4, polyurethane layer rounding device 5, polyurethane curing platform 6, polyethylene winding system 7 arranged in sequence , The coating cooling system 8 and the pipe end processing device 9 are composed of a new type of prefabricated direct-buried polyurethane spray insulation pipe production line of the present invention to realize the industrial automated production of polyurethane insulation pipes, which not only reduces labor intensity, but also improves production efficiency. .

[0049] A new type of production process for prefabricated direct-buried polyurethane sprayed thermal insulation pipe, the process includes the following steps:

[0050] Preheating: Preheat the welded pipe through the flame preheating furnace 1 to a temperature of 30℃. Preheating through the flame preheating furnace makes the shot blasting effect better and makes the rust easier to fall off. Flame combustion is used to remove combustible contaminants on the surface of the welded pipe. ;

[0051] Shot blasting: The preheated welded pipe is derusted on the outer surface of the pipe through the shot blasting machine 2, and the weld slag and burrs on the outer surface of the welded pipe are removed through the shot blasting step to ensure the cleanliness and dust of the welded pipe surface Control the cleanliness of the welded pipe surface to reach the Sa2 level or more specified in GB/T 8923, and control the depth of the anchor pattern to 80μm;

[0052] Blowing: Pass the shot blasted welded pipe through the pipe cleaning device 3 to blow the rust, residual steel shot and steel grit on the inner wall of the welded pipe into the dust collecting box, so that the inner wall of the pipe is free of debris, and the outer surface of the welded pipe is not dusty. Lower than the level 1 specified in GB/T18570.3;

[0053] Polyurethane spraying: the purged welded pipe is lifted by the spraying trolley and then rotated into the polyurethane spraying system 4 to spray polyurethane foam. When the polyurethane spraying system 4 detects the pipe head of the welded pipe, it starts to spray polyurethane foam. The spraying volume is 90g/s and the spraying pressure is 125kg/m, control the polyurethane coating density to reach 60kg/m3 or more, control the compressive strength to 0.45MPa, spray protection on the surface of the two ends of the welded pipe head of 200mm, the polyurethane layer foam thickness of the polyurethane insulation pipe of the present invention can be selected according to needs , Without being restricted by the size of the polyethylene layer;

[0054] Rounding: Use the polyurethane rounding device 5 to trim the polyurethane layer of the welded pipe after polyurethane spraying. The rounding step ensures that the polyurethane layer has a uniform thickness in the circumferential direction of the steel pipe;

[0055] Maturation: Place the rounded welded pipe on the polyurethane curing platform 6 using a tube trolley for maturation. The curing time is 900s, and the lifting height of the tube trolley is 600mm. The polyurethane foam on the surface of the tube should not be significantly deformed during transportation;

[0056] Polyethylene layer winding: the cured welded pipe is wound with polyethylene layer through the polyethylene winding system 7. The high-power SJ220 extruder is used, and the narrow die is used for extrusion and then the rotation is wound. The total thickness of the polyethylene layer is controlled to be 9.5mm. The width of the bottom polyethylene layer is 125mm, and the polyethylene layer is superimposed, and the width of the superimposed layer is 35mm;

[0057] Coating cooling: the welded pipe wrapped by the polyethylene layer is passed through the coating cooling system 8 to water-cool the polyurethane layer of the pipe body by means of online spraying. The coating cooling step improves the gap between the polyethylene layer and the polyurethane layer. And the coating strength between the polyurethane layer and the pipe body;

[0058] Pipe end treatment: Use the pipe end treatment device 9 to remove the polyethylene layer within 110mm of the pipe end, and the polyurethane layer cannot leak outside.

[0059] The prefabricated direct-buried polyurethane sprayed thermal insulation pipe produced by the present invention first sprays polyurethane foam to form a polyurethane layer, and then winds the polyethylene layer to form a polyethylene layer, which solves the problem that the internal density of the polyurethane layer is different when the thermal insulation pipe is manufactured by the existing pipe-in-pipe process. The problems of uniformity, many cavities, and difficult to detect, while avoiding the problems of high product manufacturing cost, large engineering investment, long production and construction periods in the traditional pipe-in-pipe production process, thereby improving the product quality and reliability of prefabricated insulation pipes Performance and service life.

Example Embodiment

[0060] Example three

[0061] A new type of prefabricated direct-buried polyurethane spray insulation pipe production line, see figure 1 , figure 2 The production line consists of a flame preheating furnace 1, shot blasting derusting machine 2, in-pipe purging device 3, polyurethane spraying system 4, polyurethane layer rounding device 5, polyurethane curing platform 6, polyethylene winding system 7 arranged in sequence , The coating cooling system 8 and the pipe end processing device 9 are composed of a new type of prefabricated direct-buried polyurethane spray insulation pipe production line of the present invention to realize the industrial automated production of polyurethane insulation pipes, which not only reduces labor intensity, but also improves production efficiency. .

[0062] A new type of production process for prefabricated direct-buried polyurethane sprayed thermal insulation pipe, the process includes the following steps:

[0063] Preheating: Preheat the welded pipe through the flame preheating furnace 1 to a temperature of 40°C. Preheating through the flame preheating furnace makes the shot blasting effect better and makes the rust easier to fall off. Flame combustion is used to remove combustible contaminants on the surface of the welded pipe. ;

[0064] Shot blasting: The preheated welded pipe is derusted on the outer surface of the pipe through the shot blasting machine 2, and the weld slag and burrs on the outer surface of the welded pipe are removed through the shot blasting step to ensure the cleanliness and dust of the welded pipe surface Control the cleanliness of the welded pipe surface to reach the Sa2 level specified in GB/T 8923 and the anchor depth to 100μm;

[0065] Blowing: Pass the shot blasted welded pipe through the pipe cleaning device 3 to blow the rust, residual steel shot and steel grit on the inner wall of the welded pipe into the dust collecting box, so that the inner wall of the pipe is free of debris, and the outer surface of the welded pipe is not dusty. Lower than the level 1 specified in GB/T18570.3;

[0066] Polyurethane spraying: The purged welded pipe is lifted by the spraying trolley and then rotated into the polyurethane spraying system 4 to spray polyurethane foam. When the polyurethane spraying system 4 detects the pipe head of the welded pipe, it starts to spray polyurethane foam. The spraying volume is 100g/s and the spraying pressure is 140kg/m, control the polyurethane coating density to reach 60kg/m3 or more, control the compressive strength to 0.5MPa, spray protection on the 250mm surface at both ends of the welded pipe head, the polyurethane layer foam thickness of the polyurethane insulation pipe of the present invention can be selected according to needs , Without being restricted by the size of the polyethylene layer;

[0067] Rounding: Use the polyurethane rounding device 5 to trim the polyurethane layer of the welded pipe after polyurethane spraying. The rounding step ensures that the polyurethane layer has a uniform thickness in the circumferential direction of the steel pipe;

[0068] Maturation: Place the rounded welded pipe on the polyurethane curing platform 6 using a tube trolley for maturation. The curing time is 1200s, and the lifting height of the tube trolley is 700mm. The polyurethane foam on the surface of the tube should not be significantly deformed during transportation;

[0069] Polyethylene layer winding: the cured welded pipe is wound with polyethylene layer through the polyethylene winding system 7. The high-power SJ220 extruder is used, and the narrow die is used for extrusion and then the rotation is wound. The total thickness of the polyethylene layer is controlled to 15mm, the bottom layer The width of the polyethylene layer is 150mm, the polyethylene layer is superimposed, and the width of the superimposed layer is 40mm;

[0070] Coating cooling: the welded pipe wrapped by the polyethylene layer is passed through the coating cooling system 8 to water-cool the polyurethane layer of the pipe body by means of online spraying. The coating cooling step improves the gap between the polyethylene layer and the polyurethane layer. And the coating strength between the polyurethane layer and the pipe body;

[0071] Pipe end treatment: Use the pipe end treatment device 9 to cut off the polyethylene layer within 120mm of the pipe end, and the polyurethane layer cannot leak outside.

[0072] Refer to figure 2 The new prefabricated direct-buried polyurethane spray insulation pipe produced by the present invention is composed of the polyurethane layer 11 on the surface of the welded steel pipe 10 and the outermost polyethylene layer 12. The prefabricated direct-buried polyurethane spray insulation pipe is first sprayed with polyurethane. The foam forms the polyurethane layer 11, and then the polyethylene layer is wound to form the polyethylene layer 12, which solves the problems of uneven internal density, many voids, and difficulty in detection of the polyurethane layer 11 when the existing pipe-in-pipe process is used to manufacture thermal insulation pipes.

PUM

Property	Measurement	Unit
Length	100.0 ~ 120.0	mm
Thickness	3.5 ~ 15.0	mm
Width	100.0 ~ 150.0	mm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Classification and recommendation of technical efficacy words

avoid high manufacturing costs
improve product quality

Dry method extra-fine glass wool vacuum insulated panel core material and preparation method thereof

InactiveCN103542234Aavoid high manufacturing costsAvoid thermal insulation performance degradation

Owner:SUZHOU V I P NEW MATERIAL

Novel prefabricated direct-buried polyurethane spraying heat-preservation pipe production line and production process

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Comprehensive utilization process for ageratina adenophora

Display panel, display device and display panel manufacturing method

Dry method extra-fine glass wool vacuum insulated panel core material and preparation method thereof

Groove grinding wheel profile automatic detection and regulation trimming device and method

Preparation method of porous carbon aerogel with super-high specific surface area

Intelligently controlled LED (light-emitting diode) desk lamp and control method thereof

Classification and recommendation of technical efficacy words

Dry method extra-fine glass wool vacuum insulated panel core material and preparation method thereof

Mura phenomenon compensation method

Seamless steel tube production process information tracking method

Automatic assembly equipment for LED (Light-Emitting Diode) bulb lamp

Method for producing silicate product by using molybdenum tailings and hydrothermal method

Method for producing 65Mn hot rolled steel plate