CN110901116A - Production process of prefabricated directly-buried heat-insulating pipe - Google Patents
Production process of prefabricated directly-buried heat-insulating pipe Download PDFInfo
- Publication number
- CN110901116A CN110901116A CN201911277422.2A CN201911277422A CN110901116A CN 110901116 A CN110901116 A CN 110901116A CN 201911277422 A CN201911277422 A CN 201911277422A CN 110901116 A CN110901116 A CN 110901116A
- Authority
- CN
- China
- Prior art keywords
- pipe
- polyurethane
- polyethylene
- production process
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a production process of a prefabricated direct-buried heat-insulating pipe, which comprises the following steps of derusting, degreasing, cleaning, dry spraying, polyurethane spraying, polyethylene winding and cooling extrusion: the production process includes cooling the heat insulating pipe with wound polyethylene belt, treating the end, detecting and storing, injecting rigid polyurethane foam liquid into the cavity between the steel pipe and the outer protecting layer with high pressure foaming machine to form the heat insulating polyurethane layer, and prefabricating the high density polyethylene layer into black or yellow plastic pipe with certain wall thickness. The method has simple process and short production period, can conveniently adjust the thickness of the polyurethane foaming layer and the thickness of the polyethylene winding pipe, is easy to meet the market demand, and has obvious economic benefit.
Description
Technical Field
The invention relates to the technical field of prefabricated directly-buried insulating pipe production, in particular to a production process of a prefabricated directly-buried insulating pipe.
Background
The traditional production method of the hard polyurethane heat-insulating pipe is a pipe-in-pipe production method, firstly, a standard polyethylene outer sleeve is processed by an extruder, then a steel pipe after rust removal is matched with a support frame to penetrate into the polyethylene outer sleeve, pipe plugs are adopted to seal two ends of the pipe, polyurethane raw materials are injected into an annular space, the whole space is filled with the polyurethane after foaming, then material injection holes are blocked, the pipe plugs are disassembled, and the manufacture of the heat-insulating pipe is completed. The production method has the problem of excessive quality, firstly, the outer polyethylene protective pipe is used for restraining the expansion force generated by polyurethane foaming in the polyurethane injection molding process, the design thickness of the outer polyethylene protective pipe needs to be increased in order to protect the safety of the pipe, and the quality of the forming process is excessive; secondly, the density distribution of the pipe is not uniform whether the polyurethane injection material is in a horizontal form or an inclined form, 40-50% more polyurethane raw material needs to be injected in order to ensure that the density index of each part of the pipe is not lower than the standard requirement, and the quality of the forming process is excessive.
Disclosure of Invention
The invention aims to provide a production process of a prefabricated directly-buried heat-insulating pipe, and aims to solve the problems in the prior art.
The invention is realized by the following steps:
a production process of a prefabricated direct-buried heat-insulating pipe comprises the following steps of derusting, degreasing, cleaning, drying and spraying, polyurethane spraying, polyethylene winding and cooling extrusion: the production process includes cooling the heat insulating pipe with wound polyethylene belt, treating the end, detecting and storing, injecting rigid polyurethane foam liquid into the cavity between the steel pipe and the outer protecting layer with high pressure foaming machine to form the heat insulating polyurethane layer, and prefabricating the high density polyethylene layer into black or yellow plastic pipe with certain wall thickness.
Furthermore, in the operation process, the high-density polyethylene pipe shell is sleeved on the steel pipe fixed with the support, then, flanges are used for plugging two ends of the high-density polyethylene pipe shell, and a filling hole is formed in the middle of the pipe shell.
Further, the spraying foaming medium-high density polyethylene pipe shell is 300mm shorter than the steel pipe.
Compared with the prior art, the invention has the beneficial effects that: the polyurethane is not bound when being foamed, and the outer polyethylene winding pipe is wound on the polyurethane foaming layer after being foamed, so that the problem of excessive quality in the production process is avoided.
The method has simple process and short production period, can conveniently adjust the thickness of the polyurethane foaming layer and the thickness of the polyethylene winding pipe, is easy to meet the market demand, and has obvious economic benefit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described clearly and completely in conjunction with the description of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention provided in the description is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Embodiment 1, a production process of a prefabricated direct-burried thermal insulation pipe, the production process comprising the following steps of rust removal, degreasing, cleaning, dry spraying, polyurethane spraying, polyethylene winding, cooling extrusion: the production process includes cooling the heat insulating pipe with wound polyethylene belt, treating the end, detecting and storing, injecting polyurethane heat insulating layer with high pressure foaming machine into the cavity between the outer protecting layer and the steel pipe, forming high density polyethylene protecting layer, prefabricating black or yellow plastic pipe with certain wall thickness, setting high density polyethylene pipe casing onto the steel pipe with fixed rack, sealing the two ends of the high density polyethylene pipe casing with flange, opening pouring hole in the middle of the casing, and spraying foamed medium density polyethylene pipe casing 300mm shorter than the steel pipe.
The concrete process in the scheme comprises
S1, derusting: the inner wall and the outer wall of the steel pipe are subjected to rust removal, the angle grinder is used for driving the steel wire brush to polish and remove rust, a dust suction device is required to be arranged during rust removal, the dust suction device is used for removing dust generated during polishing of rust outside the steel pipe, and damage to the body of a worker can be reduced.
S2, degreasing: and spraying or soaking the steel pipe with a degreasing agent, and cleaning to remove oil.
S3, cleaning: the method comprises the steps of cleaning the residual degreasing agent on the steel pipe by using pure water, firstly carrying out soaking cleaning, and then carrying out spraying cleaning, wherein the temperature of the pure water in the soaking cleaning is 80 ℃, the soaking cleaning time is 20 minutes, the spraying cleaning is to place the steel pipe in an inclined mode, the pure water at 50 ℃ is used for spraying the pure water from the upper end of the steel pipe, and the washing time is 6 minutes.
S4, drying: and (3) rapidly drying the cleaned steel pipe by using hot air, wherein the hot air drying method is adopted for drying by blowing, the temperature of the hot air is 50 ℃, and the hot air is blown to the inner wall and the outer wall of the steel pipe.
S5, polyurethane spraying: polyurethane is uniformly sprayed on the steel pipe which advances spirally, the steel pipe keeps a spiral advancing state, and a spray head of the spraying machine keeps static and uniform in discharging, so that uniform spraying of the polyurethane can be realized. The thickness of polyurethane spraying can be conveniently adjusted by adjusting the spiral advancing speed of the steel pipe and adjusting the discharging speed of a sprayer nozzle so as to meet the requirements of different customers and different use environments.
S6, winding polyethylene: extruding a molten polyethylene belt by using a plastic extruder and winding the polyethylene belt on the outer wall of the polyurethane layer outside the steel pipe, wherein the plastic extruder is a screw extruder, the number of temperature control areas of the screw extruder is three, namely a material extrusion temperature control area, a material melting temperature control area and an extrusion die head temperature control area, and the control temperatures of the three temperature control areas are 40 ℃, 65 ℃ and 85 ℃; the width of polyethylene area is 2 centimetres, and thickness is 3 millimeters, and the width and the thickness accessible of polyethylene area are adjusted by the aircraft nose bush of changing screw extruder, and the width and the thickness in polyethylene area are decided by the bore of screw extruder aircraft nose bush, so the accessible is changed the convenient width and the thickness adjustment that carries out the polyethylene area of aircraft nose bush to adapt to different customers and different service environment's demand.
S7, cooling: and cooling the heat preservation pipe wound with the polyethylene belt, wherein cold water is adopted for spraying a cold area, and the temperature of the cold water is 10 ℃.
S8, finished product inspection: and (5) carrying out quality inspection on the cooled heat preservation pipe.
S9, warehousing: and warehousing and storing the heat-insulating pipes qualified by inspection, and manufacturing the heat-insulating pipes again after removing the polyurethane layer and the polyethylene layer from the unqualified heat-insulating pipes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A production process of a prefabricated directly-buried insulating pipe is characterized by comprising the following steps: the production process comprises the following steps of rust removal, degreasing, cleaning, drying and spraying, polyurethane spraying, polyethylene winding and cooling extrusion: the production process includes cooling the heat insulating pipe with wound polyethylene belt, treating the end, detecting and storing, injecting rigid polyurethane foam liquid into the cavity between the steel pipe and the outer protecting layer with high pressure foaming machine to form the heat insulating polyurethane layer, and prefabricating the high density polyethylene layer into black or yellow plastic pipe with certain wall thickness.
2. The process for producing the prefabricated direct-burried thermal insulation pipe as claimed in claim 1, wherein the high-density polyethylene pipe casing is sleeved on the steel pipe with the fixed support during the operation, then flanges are used for sealing the two ends of the high-density polyethylene pipe casing, and a filling hole is formed in the middle of the pipe casing.
3. The process for producing a prefabricated direct-burried thermal insulation pipe as claimed in claim 1, wherein the spray-foamed medium-high density polyethylene pipe shell is 300mm shorter than the steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911277422.2A CN110901116A (en) | 2019-12-11 | 2019-12-11 | Production process of prefabricated directly-buried heat-insulating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911277422.2A CN110901116A (en) | 2019-12-11 | 2019-12-11 | Production process of prefabricated directly-buried heat-insulating pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110901116A true CN110901116A (en) | 2020-03-24 |
Family
ID=69825550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911277422.2A Pending CN110901116A (en) | 2019-12-11 | 2019-12-11 | Production process of prefabricated directly-buried heat-insulating pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110901116A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112538325A (en) * | 2020-12-08 | 2021-03-23 | 山东东宏管业股份有限公司 | Hot melt adhesive powder for polyethylene/polyurethane foam bonding, preparation method and application |
| CN112728229A (en) * | 2020-10-27 | 2021-04-30 | 中投(天津)智能管道股份有限公司 | Production method of 3PE steel outer protective type early warning direct-buried heat insulation pipe |
-
2019
- 2019-12-11 CN CN201911277422.2A patent/CN110901116A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728229A (en) * | 2020-10-27 | 2021-04-30 | 中投(天津)智能管道股份有限公司 | Production method of 3PE steel outer protective type early warning direct-buried heat insulation pipe |
| CN112538325A (en) * | 2020-12-08 | 2021-03-23 | 山东东宏管业股份有限公司 | Hot melt adhesive powder for polyethylene/polyurethane foam bonding, preparation method and application |
| CN112538325B (en) * | 2020-12-08 | 2022-07-26 | 山东东宏管业股份有限公司 | Hot melt adhesive powder for polyethylene/polyurethane foam adhesion, preparation method and application |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200324 |
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| WD01 | Invention patent application deemed withdrawn after publication |