CN110625064A - Method for manufacturing and spraying liquid-state solvent-free epoxy resin lining nodular cast iron pipe fitting - Google Patents
Method for manufacturing and spraying liquid-state solvent-free epoxy resin lining nodular cast iron pipe fitting Download PDFInfo
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- CN110625064A CN110625064A CN201910909132.9A CN201910909132A CN110625064A CN 110625064 A CN110625064 A CN 110625064A CN 201910909132 A CN201910909132 A CN 201910909132A CN 110625064 A CN110625064 A CN 110625064A
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- pipe fitting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/30—Metallic substrate based on refractory metals (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W)
- B05D2202/35—Metallic substrate based on refractory metals (Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W) based on Ti
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
- B05D2254/04—Applying the material on the interior of the tube
- B05D2254/06—Applying the material on the interior and exterior of the tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2507/00—Polyolefins
- B05D2507/01—Polyethylene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A manufacturing and spraying method of a nodular cast iron pipe fitting lined with liquid solventless epoxy resin comprises the following steps: the method comprises the steps of manufacturing a pipe fitting mold, a pouring gate and a pouring cup mold, preparing a mold by using a foam forming machine, placing the mold into a white mold drying chamber, cutting and reasonably bonding the mold, coating self-made refractory paint outside the mold, covering a thick plastic film for sealing, vacuumizing and compacting molding sand, performing shot blasting and sand cleaning on a casting, machining the inner surface of a bell mouth and a flange by using a machine tool, performing water pressure test on the pipe fitting, performing secondary shot blasting and surface cleaning, preheating and stirring special paint for a solvent-free epoxy drinking water tank, performing airless spraying on a pipe fitting lining, and brushing zinc-rich primer and chlorinated high-polyethylene finish paint on the outer surface of the pipe fitting. The invention adopts lost foam casting technology to produce the nodular cast iron pipe fitting lined with the liquid solventless epoxy resin, develops the airless spraying technology of the liquid solventless epoxy resin, lines the pipe fitting, and is applied to the technical field of spraying of the liquid solventless epoxy resin.
Description
Technical Field
The invention relates to a method for manufacturing and spraying a liquid solventless epoxy resin lining nodular cast iron pipe fitting in the technical field of hydraulic engineering, in particular to a method for manufacturing and spraying a lengthened liquid solventless epoxy resin lining nodular cast iron pipe fitting.
Background
At present, ductile cast iron pipelines with flexible joints are increasingly used in urban water supply pipelines due to obvious use performance of the ductile cast iron pipelines. In water conservancy projects, ductile iron pipelines are also gradually adopted. In 2017, in the water supply project in north of Liaoning province, which is implemented by the water conservancy bureau of Liaoning province, a nodular cast iron pipeline is adopted for water supply. The requirements for the nodular cast iron pipe fittings are different due to the difference of the hydraulic engineering construction conditions, the water quality conditions, the use environment and the town water supply. The first, the existing nodular cast iron pipe fittings for water supply in cities and towns are organized and produced according to GB/T13295 nodular cast iron pipe fittings for water and gas and fittings, which can completely meet the requirements of water supply construction and use in cities and towns. However, the construction conditions of hydraulic engineering and the requirements of use environments are different, and the effective length of the pipe fitting must be lengthened in design, so that great difficulty is brought to pipe fitting production. Secondly, the existing urban water supply mainly conveys tap water, and the pipe fittings are mainly protected from corrosion by adopting a cement mortar lining. Can basically meet the use requirements. And the water quality is unstable in hydraulic engineering, and the cement mortar lining is difficult to reach the service life of one hundred years. Therefore, the design requires the adoption of an airless spraying liquid solventless epoxy resin lining so as to improve the corrosion resistance quality and prolong the service life of the pipe fitting. Therefore, it is an urgent need to develop a new method for manufacturing and spraying liquid solvent-free epoxy resin lined nodular cast iron pipe fittings.
Disclosure of Invention
The invention aims to provide a method for manufacturing and spraying a liquid solvent-free epoxy resin lining nodular cast iron pipe fitting.
The purpose of the invention is realized as follows: a method for manufacturing a liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) designing a product drawing according to project requirements, and manufacturing corresponding pipe fitting molds, pouring channels and pouring cup molds, wherein the pipe fitting molds, the pouring channels and the pouring cup molds can be matched at will according to process requirements;
(2) preparing a model by using a foam forming machine, and placing the pressed lost foam into a white mold drying chamber after the qualified molded lost foam is inspected by a molding quality inspector, and drying for later use;
(3) cutting and reasonably bonding the prepared model, bonding corresponding information such as a letter manufacturer mark and the like according to the requirement of a client, and transferring to the next procedure after the bonding quality inspector inspects the qualified information;
(4) coating a layer of self-made refractory coating with a certain thickness on the exterior of the assembled model, and sending the coated model into a drying chamber for drying after the coated model is inspected to be qualified by a coating quality inspector;
(5) putting the dried model into a negative pressure sand box according to the process requirements, and bonding a pouring gate and a pouring cup; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(6) filling dry sand and compacting, laminating, vacuumizing, filling the dry sand while compacting, covering a thick plastic film on the upper surface of a sand box after filling, and vacuumizing to compact the molding sand;
(7) the melted molten iron is injected into the model under negative pressure and is poured under the pressure of-0 bar and 7bar, so that the alloy structure is more compact and the molten iron is more environment-friendly;
(8) closing the negative pressure 6 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(9) performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting the appearance and the size by a quality inspector;
(10) machining the inner surface of the bell mouth and the flange by using a machine tool according to the drawing requirements, and detecting the machined appearance and size by using a machining quality inspector;
(11) carrying out water pressure test on the pipe fitting;
the spraying method of the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) after the hydraulic pressure test is qualified, sending the shot to a secondary shot blasting position for secondary shot blasting to clean the surface;
(2) the qualified pipe fittings after shot blasting treatment are transferred to a repair site to be repaired by atomic ash according to the inspection requirements of the surface defects of the sprayed parts;
(3) preheating and stirring the special solvent-free epoxy drinking water tank paint of the Zondon 412;
(4) installing a spraying gun on the high-pressure airless spraying machine QPT6528K in Yangtze river and debugging;
(5) after all the work is ready, an operator wears protective equipment and carries out airless spraying on the pipe fitting lining;
(6) after the lining epoxy coating is sprayed, a spraying quality inspector detects the thickness and the surface smoothness;
(7) coating repairing operation is carried out on dead corners which are not easy to spray in place;
(8) brushing zinc-rich primer and high chlorinated polyethylene finish on the outer surface of the pipe fitting;
(9) and after the finished product is qualified by a final quality inspector, spraying the mark, packaging, and warehousing for shipment.
The key point of the invention lies in its manufacturing and spraying method.
Compared with the prior art, the method for manufacturing and spraying the nodular cast iron pipe fitting lined with the liquid solventless epoxy resin has the advantages that the nodular cast iron pipe fitting lined with the liquid solventless epoxy resin is produced by adopting a lost foam casting technology, a liquid solventless epoxy resin airless spraying process is developed, the pipe fitting is lined, the requirements of water supply engineering in northwest Liaoning are met, and the like, and the method can be widely applied to the technical field of spraying the liquid solventless epoxy resin.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings and examples.
FIG. 1 is a schematic structural view of a socket elbow in the nodular cast iron pipe fitting of the invention;
FIG. 2 is a table I showing the dimensions of the bell and spigot bend in the nodular cast iron pipe fitting of the invention;
FIG. 3 is a second dimension table of the bell and spigot bend pipe in the nodular cast iron pipe fitting of the invention;
FIG. 4 is a flow chart of the manufacturing process of the ductile iron pipe fitting of the present invention;
FIG. 5 is a flow chart of the process for the airless spraying of the nodular cast iron pipe lined with liquid solventless epoxy resin according to the present invention.
Detailed Description
Referring to fig. 4, the method for manufacturing the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) product drawing design is carried out according to project requirements (see attached figures 1, 2 and 3), and corresponding pipe fitting molds, pouring channels and pouring cup molds are manufactured and can be matched at will according to process requirements;
(2) preparing a model by using a foam forming machine, and placing the pressed lost foam into a white mold drying chamber after the qualified molded lost foam is inspected by a molding quality inspector, and drying for later use;
(3) cutting and reasonably bonding the prepared model, bonding corresponding information such as a letter manufacturer mark and the like according to the requirement of a client, and transferring to the next procedure after the bonding quality inspector inspects the qualified information;
(4) coating a layer of self-made refractory coating with a certain thickness on the exterior of the assembled model, and sending the coated model into a drying chamber for drying after the coated model is inspected to be qualified by a coating quality inspector;
(5) putting the dried model into a negative pressure sand box according to the process requirements, and bonding a pouring gate and a pouring cup; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(6) filling dry sand and compacting, laminating, vacuumizing, filling the dry sand while compacting, covering a thick plastic film on the upper surface of a sand box after filling, and vacuumizing to compact the molding sand;
(7) the melted molten iron is injected into the model under negative pressure and is poured under the pressure of-0 bar and 7bar, so that the alloy structure is more compact and the molten iron is more environment-friendly;
(8) closing the negative pressure 6 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(9) performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting the appearance and the size by a quality inspector;
(10) machining the socket and the flange by using a machine tool according to the drawing requirements, and detecting the appearance and the size of the machined socket and flange by using a machining quality inspector;
(11) and carrying out water pressure test on the pipe fitting.
Referring to fig. 5, the spraying method of the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) after the hydraulic pressure test is qualified, sending the shot to a secondary shot blasting position for secondary shot blasting to clean the surface;
(2) the qualified pipe fittings after shot blasting treatment are transferred to a repair site to be repaired by atomic ash according to the inspection requirements of the surface defects of the sprayed parts;
(3) preheating and stirring the special solvent-free epoxy drinking water tank paint of the Zondon 412;
(4) installing a spraying gun on the high-pressure airless spraying machine QPT6528K in Yangtze river and debugging;
(5) after all the work is ready, an operator wears protective equipment and carries out airless spraying on the pipe fitting lining;
(6) after the lining epoxy coating is sprayed, a spraying quality inspector detects the thickness and the surface smoothness;
(7) coating repairing operation is carried out on dead corners which are not easy to spray in place;
(8) brushing zinc-rich primer and high chlorinated polyethylene finish on the outer surface of the pipe fitting;
(9) and after the finished product is qualified by a final quality inspector, spraying the mark, packaging, and warehousing for shipment.
Example one
The manufacturing method of the DN1200 socket elbow used for the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) product drawing design is carried out according to project requirements (see attached figures 1, 2 and 3), and corresponding pipe fitting molds, pouring channels and pouring cup molds are manufactured and can be matched at will according to process requirements;
(2) preparing a model by using a foam forming machine, and placing the pressed lost foam into a white mold drying chamber after the qualified molded lost foam is inspected by a molding quality inspector, and drying for later use;
(3) cutting and reasonably bonding the prepared model, bonding corresponding information such as a letter manufacturer mark and the like according to the requirement of a client, and transferring to the next procedure after the bonding quality inspector inspects the qualified information;
(4) coating a layer of self-made refractory coating with a certain thickness on the exterior of the assembled model, and sending the coated model into a drying chamber for drying after the coated model is inspected to be qualified by a coating quality inspector;
(5) putting the dried model into a negative pressure sand box according to the process requirements, and bonding a pouring gate and a pouring cup; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(6) filling dry sand and compacting, laminating, vacuumizing, filling the dry sand while compacting, covering a thick plastic film on the upper surface of a sand box after filling, and vacuumizing to compact the molding sand;
(7) the melted molten iron is injected into the model under negative pressure and is poured under the pressure of-0 bar and 7bar, so that the alloy structure is more compact and the molten iron is more environment-friendly;
(8) closing the negative pressure 6 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(9) performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting the appearance and the size by a quality inspector;
(10) machining the socket and the flange by using a machine tool according to the drawing requirements, and detecting the appearance and the size of the machined socket and flange by using a machining quality inspector;
(11) and carrying out water pressure test on the pipe fitting.
The spraying method of the DN1200 socket elbow used for the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) after the hydraulic pressure test is qualified, sending the shot to a secondary shot blasting position for secondary shot blasting to clean the surface;
(2) the qualified pipe fittings after shot blasting treatment are transferred to a repair site to be repaired by atomic ash according to the inspection requirements of the surface defects of the sprayed parts;
(3) preheating and stirring the special solvent-free epoxy drinking water tank paint of the Zondon 412;
(4) installing a spraying gun on the high-pressure airless spraying machine QPT6528K in Yangtze river and debugging;
(5) after all the work is ready, an operator wears protective equipment and carries out airless spraying on the pipe fitting lining;
(6) after the lining epoxy coating is sprayed, a spraying quality inspector detects the thickness and the surface smoothness;
(7) coating repairing operation is carried out on dead corners which are not easy to spray in place;
(8) brushing zinc-rich primer and high chlorinated polyethylene finish on the outer surface of the pipe fitting;
(9) and after the finished product is qualified by a final quality inspector, spraying the mark, packaging, and warehousing for shipment.
Example two
The manufacturing method of the DN900 socket elbow used for the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) product drawing design is carried out according to project requirements (see attached figures 1, 2 and 3), and corresponding pipe fitting molds, pouring channels and pouring cup molds are manufactured and can be matched at will according to process requirements;
(2) preparing a model by using a foam forming machine, and placing the pressed lost foam into a white mold drying chamber after the qualified molded lost foam is inspected by a molding quality inspector, and drying for later use;
(3) cutting and reasonably bonding the prepared model, bonding corresponding information such as a letter manufacturer mark and the like according to the requirement of a client, and transferring to the next procedure after the bonding quality inspector inspects the qualified information;
(4) coating a layer of self-made refractory coating with a certain thickness on the exterior of the assembled model, and sending the coated model into a drying chamber for drying after the coated model is inspected to be qualified by a coating quality inspector;
(5) putting the dried model into a negative pressure sand box according to the process requirements, and bonding a pouring gate and a pouring cup; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(6) filling dry sand and compacting, laminating, vacuumizing, filling the dry sand while compacting, covering a thick plastic film on the upper surface of a sand box after filling, and vacuumizing to compact the molding sand;
(7) the melted molten iron is injected into the model under negative pressure and is poured under the pressure of-0 bar and 7bar, so that the alloy structure is more compact and the molten iron is more environment-friendly;
(8) closing the negative pressure 6 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(9) performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting the appearance and the size by a quality inspector;
(10) machining the socket and the flange by using a machine tool according to the drawing requirements, and detecting the appearance and the size of the machined socket and flange by using a machining quality inspector;
(11) and carrying out water pressure test on the pipe fitting.
The spraying method of the DN900 socket elbow used for the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) after the hydraulic pressure test is qualified, sending the shot to a secondary shot blasting position for secondary shot blasting to clean the surface;
(2) the qualified pipe fittings after shot blasting treatment are transferred to a repair site to be repaired by atomic ash according to the inspection requirements of the surface defects of the sprayed parts;
(3) preheating and stirring the special solvent-free epoxy drinking water tank paint of the Zondon 412;
(4) installing a spraying gun on the high-pressure airless spraying machine QPT6528K in Yangtze river and debugging;
(5) after all the work is ready, an operator wears protective equipment and carries out airless spraying on the pipe fitting lining;
(6) after the lining epoxy coating is sprayed, a spraying quality inspector detects the thickness and the surface smoothness;
(7) coating repairing operation is carried out on dead corners which are not easy to spray in place;
(8) brushing zinc-rich primer and high chlorinated polyethylene finish on the outer surface of the pipe fitting;
(9) and after the finished product is qualified by a final quality inspector, spraying the mark, packaging, and warehousing for shipment.
Claims (2)
1. A method for manufacturing a liquid solventless epoxy resin lining nodular cast iron pipe fitting is characterized by comprising the following steps: the manufacturing method of the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) designing a product drawing according to project requirements, and manufacturing corresponding pipe fitting molds, pouring channels and pouring cup molds, wherein the pipe fitting molds, the pouring channels and the pouring cup molds can be matched at will according to process requirements;
(2) preparing a model by using a foam forming machine, and placing the pressed lost foam into a white mold drying chamber after the qualified molded lost foam is inspected by a molding quality inspector, and drying for later use;
(3) cutting and reasonably bonding the prepared model, bonding corresponding information such as a letter manufacturer mark and the like according to the requirement of a client, and transferring to the next procedure after the bonding quality inspector inspects the qualified information;
(4) coating a layer of self-made refractory coating with a certain thickness on the exterior of the assembled model, and sending the coated model into a drying chamber for drying after the coated model is inspected to be qualified by a coating quality inspector;
(5) putting the dried model into a negative pressure sand box according to the process requirements, and bonding a pouring gate and a pouring cup; the negative pressure sand box is provided with a vacuumizing tube, and a control valve is adjusted when the vacuum pump works to control the negative pressure;
(6) filling dry sand and compacting, laminating, vacuumizing, filling the dry sand while compacting, covering a thick plastic film on the upper surface of a sand box after filling, and vacuumizing to compact the molding sand;
(7) the melted molten iron is injected into the model under negative pressure and is poured under the pressure of-0 bar and 7bar, so that the alloy structure is more compact and the molten iron is more environment-friendly;
(8) closing the negative pressure 6 minutes after pouring, naturally cooling for 2 hours, and taking out the casting from the sand box;
(9) performing shot blasting and sand cleaning on the casting, grinding burrs, and detecting the appearance and the size by a quality inspector;
(10) machining the inner surface of the bell mouth and the flange by using a machine tool according to the drawing requirements, and detecting the machined appearance and size by using a machining quality inspector;
(11) and carrying out water pressure test on the pipe fitting.
2. A spraying method of a liquid solventless epoxy resin lining nodular cast iron pipe fitting is characterized by comprising the following steps: the spraying method of the liquid solventless epoxy resin lining nodular cast iron pipe fitting comprises the following steps:
(1) after the hydraulic pressure test is qualified, sending the shot to a secondary shot blasting position for secondary shot blasting to clean the surface;
(2) the qualified pipe fittings after shot blasting treatment are transferred to a repair site to be repaired by atomic ash according to the inspection requirements of the surface defects of the sprayed parts;
(3) preheating and stirring the special solvent-free epoxy drinking water tank paint of the Zondon 412;
(4) installing a spraying gun on the high-pressure airless spraying machine QPT6528K in Yangtze river and debugging;
(5) after all the work is ready, an operator wears protective equipment and carries out airless spraying on the pipe fitting lining;
(6) after the lining epoxy coating is sprayed, a spraying quality inspector detects the thickness and the surface smoothness;
(7) coating repairing operation is carried out on dead corners which are not easy to spray in place;
(8) brushing zinc-rich primer and high chlorinated polyethylene finish on the outer surface of the pipe fitting;
(9) and after the finished product is qualified by a final quality inspector, spraying the mark, packaging, and warehousing for shipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910909132.9A CN110625064A (en) | 2019-09-25 | 2019-09-25 | Method for manufacturing and spraying liquid-state solvent-free epoxy resin lining nodular cast iron pipe fitting |
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| CN201910909132.9A CN110625064A (en) | 2019-09-25 | 2019-09-25 | Method for manufacturing and spraying liquid-state solvent-free epoxy resin lining nodular cast iron pipe fitting |
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| CN110625064A true CN110625064A (en) | 2019-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520541A (en) * | 2020-04-30 | 2020-08-11 | 辽宁爱维尔金属成型科技股份有限公司 | Large-caliber three-section clamping type nodular cast iron pipeline buttress for pipe gallery |
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