CN111482346A - Pipeline inner wall spraying method based on reinforced primer coating - Google Patents
Pipeline inner wall spraying method based on reinforced primer coating Download PDFInfo
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- CN111482346A CN111482346A CN202010242145.8A CN202010242145A CN111482346A CN 111482346 A CN111482346 A CN 111482346A CN 202010242145 A CN202010242145 A CN 202010242145A CN 111482346 A CN111482346 A CN 111482346A
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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
- 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
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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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
- B05D3/02—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 baking
- B05D3/0254—After-treatment
- B05D3/0263—After-treatment with IR heaters
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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
- B05D3/04—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 exposure to gases
- B05D3/0406—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 exposure to gases the gas being air
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a pipeline inner wall spraying method based on a reinforced primer, and relates to the technical field of pipeline spraying. After primary coating spraying is carried out on the inner wall of a pipe to be sprayed, the coating sprayed with the primary coating is sprayed and blown again, heating is carried out after spraying, and secondary coating spraying is carried out after heating; in the spraying process, a first sprayer firstly sprays paint at the position; then the blower blows the part to remove the coating which is not tightly combined with the outer surface of the primary coating sprayed coating; heating and strengthening the primary coating sprayed coating by a heater, and finally spraying the secondary coating by a second sprayer; the invention can greatly improve the bonding strength of the coating on the inner wall of the pipe to be sprayed by the process.
Description
Technical Field
The invention relates to the technical field of pipeline spraying, in particular to a pipeline inner wall spraying method based on a reinforced primer.
Background
The pipeline is an important component of industrial production and civil facilities and is also a main facility in pipeline transportation. With the rapid development of the industry in China and the improvement of the construction speed of urban public facilities, the pipeline construction is also rapidly developed; transport pipelines are used in severe environments in some cases, and the corrosion and protection problems of the transport pipelines are always key factors related to the reliability and the service life of the pipelines.
At present, to the protection of metal pipeline inner wall, the method of taking usually is exactly at pipeline inner wall coating anticorrosion, non-stick coating, it is anticorrosive at pipeline inner wall coating anticorrosion, non-stick coating has with low costs, realize easily and advantage such as adhesion is good, however, the spraying equipment of current metal pipeline inner wall is mostly the stock spray gun, operating personnel is in the spraying process, must hand the stock spray gun and carry out the spraying to the metal pipeline inner wall, but the coating spraying is uneven very easily in the spraying process, the coating thickness that leads to firing is undulant great, and the stability of spraying material combination on pipeline inner wall is relatively poor.
The automatic spraying system is also produced by taking advantage of the automatic control of electric appliances or mechanical principles (manipulators or robots), the automatic spraying is controlled and monitored by adopting an industrial control computer P L C program, the automatic spraying production line is generally arranged in a closed space and comprises a conveying unit, a dust removal unit, a spraying unit, an exhaust unit and a drying unit, the dust removal unit, the spraying unit and the drying unit are arranged in partitions, an exhaust unit is arranged in each partition, a conveying mechanism penetrates through the whole automatic spraying production line, a workpiece or a product enters a spraying chamber or a spraying chamber of the spraying unit through the conveying mechanism after being dedusted by the dust removal unit for spraying, enters a baking unit for drying after being sprayed, and is output through a conveying mechanism finished product, and industrial waste gas containing dust and mist paint waste gas is exhausted from the exhaust unit after being diffused in each partition.
Through retrieval, the patent with the patent publication number of CN110314792A discloses a spraying method of an automatic spraying unit for a workpiece with a long and thin structure, the automatic spraying unit for the workpiece with the long and thin structure is characterized in that a box-shaped cover with a closed inner cavity is spanned and installed at the butt joint position of two adjacent conveying sections of a conveying line which are in butt joint end to end, the length dimension of the box-shaped cover along the front-back direction is smaller than that of the workpiece with the long and thin structure, and a spraying input port and a spraying output port are arranged at the position of the box-shaped cover corresponding to the conveying line; the butt joint position of two adjacent sections of conveying sections of the conveying line is also provided with a transition carrying wheel matched with the size of the bottom of the accompanying carrying frame; although the technical scheme of this patent can improve the even degree to pipeline inner wall coating spraying to a certain extent, only through the mode of once only spraying with coating spraying to pipeline inner wall on be difficult to guarantee the combination degree of coating on the inner wall, influence the extension effect of the life of spraying back pipeline to a certain extent.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to provide a pipeline inner wall spraying method based on a reinforced primer coating, aiming at the technical problem of low bonding degree of the sprayed coating and the pipeline when the pipeline inner wall is sprayed in the prior art.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a pipeline inner wall spraying method based on a reinforced bottom coating.
Preferably, the method comprises the following specific steps:
(1) the spraying unit is arranged inside the pipe to be sprayed, so that the pipe to be sprayed and the spraying unit rotate axially relatively, and the pipe to be sprayed and the spraying unit translate relatively along the axial direction;
(2) enabling the inner wall of the pipe to be sprayed to pass through a first sprayer of the spraying unit, and spraying the coating to the inner wall of the pipe to be sprayed by the first sprayer to form a primary coating;
(3) enabling the inner wall of the pipe to be sprayed, which forms the primary coating sprayed coating, to pass through a sprayer of the spraying unit, and spraying the primary coating sprayed coating on the inner wall of the pipe to be sprayed by the sprayer together with the gas and the coating;
(4) enabling the inner wall of the pipe to be sprayed after being sprayed by the sprayer to pass through a heater of the spraying unit, and heating the sprayed primary coating spraying coating by the heater;
(5) and enabling the inner wall of the pipe to be sprayed, which is heated by the heater, to pass through a second sprayer of the spraying unit, and spraying the coating onto the heated primary coating sprayed coating by the second sprayer.
Preferably, the rotating speed of the pipe to be sprayed and the spraying unit which rotate axially relative to each other in the step (1) is 10-100 r/min; the relative translation speed of the pipe to be sprayed and the spraying unit along the axial direction is 80-800 mm/min.
Preferably, the thickness of the primary coating sprayed on the inner wall of the pipe to be sprayed by the first sprayer in the step (2) is mm.
Preferably, the blower in step (3) is an inclined blower.
Preferably, the blowing nozzle of the blowing device comprises a Raoult nozzle, the Raoult nozzle comprises a contraction section and an expansion section, the contraction starting end of the contraction section is connected with the gas tank through an air duct, and the side part of the expansion section is connected with the coating tank through a coating duct.
Preferably, the heating temperature of the heater in the step (4) is 45-80 ℃.
Preferably, the heater is an infrared heating pipe, the length of the heater along the axial direction of the supporting rod is L, wherein 9.5m is equal to or less than L m is equal to or less than 10m, the distance from a blowing nozzle on the sprayer to the heater is d2, wherein 0.3m is equal to or less than d2 is equal to or less than 0.35m, the distance from a second nozzle on the second sprayer to the heater is d3, wherein 0.3m is equal to or less than d3 is equal to or less than 0.35 m.
Preferably, the thickness of the coating after the second sprayer sprays the coating to the heated primary coating spray coating in the step (5) is mm.
Preferably, the inclination angle of the inclined blowing is α, the distance from the blowing nozzle of the blowing to the inner wall of the pipe to be sprayed is h, and the inclination angle α satisfies tan α ═ k · h, where 0 < k ≦ 1.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention relates to a pipeline inner wall spraying method based on a reinforced bottom coating, which comprises the steps of spraying the coating sprayed by the primary coating after the primary coating is sprayed on the inner wall of a pipe to be sprayed, spraying, heating, and spraying the secondary coating after heating; in the spraying process, a first sprayer firstly sprays paint at the position; then the blower blows the part to remove the coating which is not tightly combined with the outer surface of the primary coating sprayed coating; heating the primary coating sprayed coating by a heater to realize the strengthening of the primer coating, and finally spraying the secondary coating by a second sprayer; the bonding strength of the coating on the inner wall of the pipe to be sprayed can be greatly improved through the process.
(2) According to the pipeline inner wall spraying method based on the reinforced bottom coating, the spraying direction is obliquely arranged, the oblique direction of the spraying direction faces the direction of the first sprayer close to the first sprayer, the first spraying nozzle can better achieve the effect of blowing off the coating which is not tightly combined with the outer surface of the primary coating spraying coating through oblique spraying, in addition, the damage to the primary coating spraying coating which is better combined in the process can be reduced, and the combination effect of the subsequent coating on the inner wall of the pipe to be sprayed is favorably improved.
Drawings
FIG. 1 is a schematic structural diagram of a spraying system used in a pipeline inner wall spraying method based on a reinforced primer;
FIG. 2 is a schematic diagram of the arrangement of the spraying units in the spraying system used in the method for spraying the inner wall of the pipeline based on the reinforced primer;
FIG. 3 is a schematic structural view of a first blowing nozzle of the present invention;
FIG. 4 is a flow chart of a method for spraying the inner wall of a pipeline based on the reinforced primer.
The reference numerals in the schematic drawings illustrate:
110. a support table; 120. a support frame; 130. a support bar; 140. a mobile station; 141. a support bearing; 142. a driver; 150. spraying a pipe to be sprayed;
210. a first sprayer; 211. a first nozzle; 220. a first blower; 221. an air extraction opening; 222. a first blowing nozzle; 223. an expansion section; 224. a contraction section; 225. an air duct; 226. coating a pipeline; 230. a heater; 240. a second sprayer; 241. a second nozzle; 250. a second blower; 251. a second blowing nozzle;
310. a paint tank; 311. a stirrer; 312. a spray pump; 320. a gas tank; 321. an air pump; 330. and (7) an exhaust port.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. Meanwhile, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description only, and are not used to limit the implementable scope, and the relative relationship changes or adjustments may be considered to be within the implementable scope of the present invention without substantial technical changes; in addition, the embodiments of the present invention are not independent of each other, but may be combined.
Example 1
In the method for spraying the inner wall of the pipeline based on the reinforced primer, after the primary coating is sprayed on the inner wall of the pipeline to be sprayed, the coating sprayed with the primary coating is sprayed again, and then the heating is carried out, and then the secondary coating spraying is carried out after the heating. Preferably, as shown in fig. 4, the specific steps are as follows:
(1) installing the spraying unit inside the pipe 150 to be sprayed, so that the pipe 150 to be sprayed and the spraying unit axially rotate relatively, and meanwhile, the pipe 150 to be sprayed and the spraying unit axially translate relatively; the rotating speed of the pipe 150 to be sprayed and the spraying unit which rotate axially relative to each other is 10-100 r/min; the relative translation speed of the pipe 150 to be sprayed and the spraying unit along the axial direction is 80-800 mm/min.
(2) The inner wall of the pipe 150 to be sprayed firstly passes through the first sprayer 210 of the spraying unit, and the first sprayer 210 sprays the coating on the inner wall of the pipe 150 to be sprayed to form a primary coating sprayed coating; the thickness of the primary coating sprayed layer formed on the inner wall of the pipe 150 to be sprayed by the first sprayer 210 is 0.4-0.6 mm.
(3) The inner wall of the pipe 150 to be sprayed, which forms the primary coating sprayed coating, passes through a sprayer of the spraying unit, the sprayer sprays the primary coating sprayed coating on the inner wall of the pipe 150 to be sprayed together with gas, a used spraying nozzle on the sprayer comprises a Raoult nozzle, the Raoult nozzle comprises a contraction section 224 and an expansion section 223, the contraction starting end of the contraction section 224 is connected with a gas tank 320 through an air duct 225, the side part of the expansion section 223 is connected with a coating tank 310 through a coating duct 226, the sprayer is inclined for spraying, the inclination angle of the inclined spraying is α, the distance from the spraying nozzle to the inner wall of the pipe 150 to be sprayed is h, and the inclination angle α meets the requirement that tan α is k.h, wherein k is more than 0 and less than or equal to 1.
(4) The inner wall of the pipe 150 to be sprayed after being sprayed by the sprayer passes through the heater 230 of the spraying unit, the heater 230 heats the sprayed primary paint spraying coating, the heating temperature of the heater 230 is 45-80 ℃, the heater 230 is an infrared heating pipe, the length of the heater 230 along the axial direction of the supporting rod 130 is L, wherein L is more than or equal to 9.5m and less than or equal to 10m, the distance from a spraying nozzle on the sprayer to the heater 230 is d2, wherein d2 is more than or equal to 0.3m and less than or equal to 0.35m, the distance from a second nozzle 241 on the second sprayer 240 to the heater 230 is d3, and wherein d3 is more than or equal to 0.3m and less than or equal to 0.35 m.
(5) The inner wall of the pipe 150 to be sprayed, heated by the heater 230, passes through the second sprayer 240 of the spraying unit, and the second sprayer 240 sprays the coating onto the heated primary coating sprayed coating. The second sprayer 240 sprays the paint to the thickness of the heated first paint sprayed layer, which is mm.
Example 1
As shown in fig. 1, the system for spraying a coating on the inner wall of a pipeline of the present embodiment includes a supporting unit, a spraying unit, and a supplying unit; the supporting unit comprises a supporting table 110, 2 supporting frames 120, a supporting rod 130 and a mobile station 140, wherein the supporting rod 130 is horizontally arranged above the supporting table 110, and two ends of the supporting rod 130 are respectively supported by the supporting frames 120; and at least one of the two ends of the supporting rod 130 is separated from the supporting frame 120, so that the pipe 150 to be sprayed can be sleeved outside the supporting rod 130 when in use.
The support table 110 is provided with a moving table 140, the moving table 140 is rotatably disposed with a tube 150 to be sprayed, specifically, the moving table 140 is provided with support bearings 141, the support bearings 141 are used for mounting the tube 150 to be sprayed, in this embodiment, at least 2 support bearings 141 are provided, and when in use, the support bearings 141 are mounted at two ends of the tube 150 to be sprayed, so that the tube 150 to be sprayed can axially rotate; in addition, a driver 142 is disposed on the moving stage 140 for driving the tube 150 to be sprayed to rotate axially. In this embodiment, the driver 142 includes a motor and a rotating wheel driven by the motor, the surface of the rotating wheel may be made of a material with large friction and flexibility, such as a rubber material, the surface of the rotating wheel contacts with the outer surface of the pipe 150 to be sprayed, the rotating wheel rotates to drive the pipe 150 to be sprayed to rotate, and the rotating speed of the pipe 150 to be sprayed and the spraying unit rotating axially relative to each other is 10 to 100 r/min; in this embodiment, the rotation speed of the pipe 150 to be sprayed is 75 r/min.
In addition, the moving stage 140 is disposed on the supporting table 110 in a translatable manner, in this embodiment, the moving stage 140 translates on the supporting table 110 in a worm transmission manner, the supporting rod 130 is provided with a spraying unit, the supporting rod 130 is located in the pipe 150 to be sprayed, the moving stage 140 drives the pipe 150 to be sprayed thereon to move, and the spraying unit sprays the inner wall of the pipe 150 to be sprayed in the pipe 150 to be sprayed.
The spraying unit comprises a first sprayer 210, a blower, a heater 230 and a second sprayer 240, and the first sprayer 210, the blower, the heater 230 and the second sprayer 240 are sequentially arranged on the supporting rod 130; as shown in fig. 2, before the inner wall of the pipe 150 to be sprayed starts to be sprayed, the leftmost end of the pipe 150 to be sprayed in fig. 2 is positioned at the first sprayer 210 under the driving of the moving stage 140, and when spraying starts, the moving stage 140 drives the pipe 150 to be sprayed to move, and the pipe 150 to be sprayed moves to the right in fig. 2, that is, the pipe 150 to be sprayed moves in the direction opposite to the direction in which the first sprayer 210, the sprayer, the heater 230 and the second sprayer 240 are arranged on the support rod 130; the relative translation speed of the pipe 150 to be sprayed and the spraying unit along the axial direction is 80-800 mm/min, and the movement speed in this embodiment is 370 mm/min.
The first sprayer 210, the blower, and the second sprayer 240 communicate with the supply unit; the supply unit is used to supply the first sprayer 210, the blower, and the second sprayer 240 with spray paint or gas. The supply unit includes a paint tank 310 and an air tank 320, the paint tank 310 being connected to the first 210, the blower, and the second 240 sprayers through pipes, and the air tank 320 being connected to the blower through pipes. And the paint can 310 is connected to the first sprayer 210, the blower and the second sprayer 240 by a spray pump 312, the spray pump 312 functions to pump the paint in the paint can 310 into the first sprayer 210 and/or the blower and/or the second sprayer 240; the gas tank 320 is connected to the blower by a gas pump 321, and the gas pump 321 is used for pumping the gas in the gas tank 320 into the blower.
In the moving process of the pipe 150 to be sprayed, for a certain spraying position on the inner wall of the pipe 150 to be sprayed, the first sprayer 210 firstly sprays the first paint on the certain spraying position, the first nozzle 211 of the first sprayer 210 sprays the first paint on the spraying position to form a first paint spraying coating, the thickness of the first paint spraying coating is 0.4-0.6mm, and the thickness of the first paint spraying coating in the embodiment is 0.5 mm. The rotating pipe 150 to be sprayed is beneficial to the uniformity of the coating of the primary coating sprayed on the one hand, and the bonding effect of the primary coating sprayed on the inner wall of the pipe 150 to be sprayed under the centrifugal force is further improved because the pipe 150 to be sprayed rotates because the primary coating sprayed on the inner wall of the pipe 150 to be sprayed is attached to the inner wall of the pipe 150 to be sprayed. However, one of the problems that occurs after the primary coating is applied is that the surface of the primary coating applied layer still has a coating with poor bonding strength, and the presence of the coating with low bonding strength still causes the deterioration of the coating quality.
After carrying out a spraying, the spraying department moves to the corresponding position of the sprayer, the sprayer includes first sprayer 220, be provided with first blowing nozzle 222 on the first sprayer 220, the slope of the jetting direction of first blowing nozzle 222 sets up, its slope orientation is close to the direction of first sprayer 210 towards first sprayer 220, first blowing nozzle 222 can realize better not closely combining the blowdown effect of coating to a coating spraying coating surface through slope jetting.
In addition, as shown in fig. 3, the first blowing nozzle 222 is a raoult nozzle which comprises a contraction section 224 and an expansion section 223, the contraction starting end of the contraction section 224 is connected with the gas tank 320 through the air duct 225, the side part of the expansion section 223 is connected with the coating tank 310 through the coating duct 226, the gas blows the primary coating sprayed coating at a high speed under the action of the raoult nozzle, meanwhile, the coating entering from the side part of the expansion section 223 is impacted by the high-speed gas in the expansion section 223 to form droplets, the droplets are blown to the inner wall of the pipe 150 to be sprayed along with the high-speed gas flow, so that the primary coating sprayed coating is bonded with better strength, in addition, the inclination angle of the first blowing nozzle 222 is α, the distance from the first blowing nozzle 222 to the inner wall of the pipe 150 to be sprayed is h, the inclination angle α meets the condition that tan α is k · h, wherein 0 < k is less than or equal to 1, and k is 0.45 in the embodiment, and on the premise of ensuring the blowing effect, the damage to the secondary coating in the process can be reduced, and the improvement of the subsequent sprayed coating on the inner wall of the pipe 150 to be sprayed.
It should be noted that, in the process of blowing the primary paint sprayed coating, the first blowing nozzle 222 may also atomize and splash paint with weak bonding force on the original surface layer of the primary paint sprayed coating, so that the blowing apparatus in this embodiment further includes a second blowing apparatus 250, and the second blowing apparatus 250 is disposed on a side of the first blowing apparatus 220 close to the first blowing apparatus 210; the second blowing device 250 is provided with a second blowing nozzle 251, and the second blowing nozzle 251 is connected with the gas tank 320 through a pipeline; the blowing of the second blowing nozzle 251 can enable the paint which is blown by the first blowing nozzle 222 and generates atomized splashing to be bonded to the surface of the primary paint spraying coating again, and at the moment, the paint can be fully bonded with the primary paint spraying coating to play a role in strengthening the coating.
An air suction port 221 is arranged between the first sprayer 220 and the first sprayer 210, and the air suction direction of the air suction port 221 faces the first sprayer 220; the pumping port 221 is communicated to the exhaust port 330 through a pipeline; the suction opening 221 functions to discharge the residual atomized splashed coating material from the inside of the pipe 150 to be sprayed.
In addition, the distance from the first blowing nozzle 222 on the first sprayer 220 to the first nozzle 211 on the first sprayer 210 is d1, where 0.2 m. ltoreq. d 1. ltoreq.0.3 m.
After the primary paint spraying coating is subjected to blowing treatment, the primary paint spraying coating is heated and strengthened through a heater 230, the heater 230 is an infrared heating pipe, the length of the heater 230 along the axial direction of the supporting rod 130 is L, 9.5m is smaller than or equal to L m and smaller than or equal to 10m, the heating temperature of the heater 230 is 45-80 ℃, in the embodiment, the heating temperature is 65 ℃, the primary paint spraying coating is heated, so that the primary paint spraying coating can be strengthened primarily, the strengthened primary paint spraying coating is heated, then secondary paint spraying is carried out on the secondary sprayer 240, a secondary paint spraying coating is formed, the overall thickness of the coating is 0.8-1.2 mm, namely the overall thickness of the primary paint spraying coating and the secondary paint spraying coating is 0.8-1.2 mm, in the embodiment, the coating formed by combining the primary paint spraying coating and the secondary paint spraying coating is good in corrosion resistance, the distance from a blowing nozzle on a blower to the heater 230 is d2, wherein d 2m is smaller than or equal to d 2m, and the distance from a second sprayer 241 to the heater 230 is smaller than or equal to 3.82 m, and the distance from 3635 m is equal to 360.82.
Taking a pipeline inner wall sample, and carrying out the following performance tests:
and (3) testing impact strength: drop hammer test (small area punch) according to ISO 6272-2e 2002;
and (3) wear resistance test: testing the abrasion resistance rating method of the organic coating according to astm d 968-93(2001) shakeout method;
and (3) weather resistance test: according to GB/T1865-1997;
the results of the performance tests are shown in table 1.
Comparative example 1
The present embodiment is basically the same as embodiment 1, except that the spraying unit in the present embodiment only includes the first sprayer 210, the heater 230 and the second sprayer 240, and is not provided with a blower, and other device parameters are the same as those of embodiment 1, the first sprayer 210 sprays and forms a primary paint spraying coating on the inner wall of the pipeline, and the thickness of the coating is 0.5 mm; heating by a heater 230 until a secondary coating spraying coating is formed at the position of a second sprayer 240 by spraying, wherein the total thickness of the secondary coating spraying coating and the primary coating spraying coating is 1.0 mm; there is no blowing process in the middle.
Taking a pipeline inner wall sample, and carrying out the following performance tests:
and (3) testing impact strength: drop hammer test (small area punch) according to ISO 6272-2e 2002;
and (3) wear resistance test: testing the abrasion resistance rating method of the organic coating according to astm d 968-93(2001) shakeout method;
and (3) weather resistance test: according to GB/T1865-1997;
the results of the performance tests are shown in table 1.
Comparative example 2
The present embodiment is basically the same as embodiment 1, except that the spraying unit in the present embodiment only includes the first sprayer 210, the blower, and the second sprayer 240, and the heater 230 is not provided, and other device parameters are the same as embodiment 1, the first sprayer 210 sprays and forms a primary paint spraying coating on the inner wall of the pipeline, and the thickness of the coating is 0.5 mm; then, the mixture is blown by a blowing device, the blowing parameters are the same as those of the embodiment 1, and a secondary coating spraying coating is formed at the position of the second spraying device 240 by spraying, wherein the total thickness of the secondary coating spraying coating and the primary coating spraying coating is 1.0 mm; there is no heating process in between. Taking a pipeline inner wall sample, and carrying out the following performance tests:
and (3) testing impact strength: drop hammer test (small area punch) according to ISO 6272-2e 2002;
and (3) wear resistance test: testing the abrasion resistance rating method of the organic coating according to astm d 968-93(2001) shakeout method;
and (3) weather resistance test: according to GB/T1865-1997;
the results of the performance tests are shown in table 1.
Comparative example 3
The present embodiment is basically the same as embodiment 1, except that the spraying unit in the present embodiment only includes the first sprayer 210, the blower and the heater 230, and the second sprayer 240 is not provided, and other device parameters are the same as embodiment 1, the first sprayer 210 sprays and forms a primary paint spraying coating on the inner wall of the pipeline, and the thickness of the coating is 1.0 mm; then blowing through a blower, and heating and curing after blowing; the blowing preheating parameters are the same as those in the embodiment 1; there was no secondary spraying. Taking a pipeline inner wall sample, and carrying out the following performance tests:
and (3) testing impact strength: drop hammer test (small area punch) according to ISO 6272-2e 2002;
and (3) wear resistance test: testing the abrasion resistance rating method of the organic coating according to astm d 968-93(2001) shakeout method;
and (3) weather resistance test: according to GB/T1865-1997;
the results of the performance tests are shown in table 1.
Table 1 comparative plot of properties for each example
| Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Impact Strength (J) | 103 | 76 | 81 | 38 |
| Abrasion resistance (L/pm) | 4.3 | 3.2 | 3.5 | 2.1 |
| Weather resistance (h) | 6000 | 2700 | 3400 | 1300 |
As can be seen from Table 1, the impact strength, abrasion resistance and weather resistance of the coating formed in example 1 are significantly improved as compared with those of the coatings in comparative examples 1 to 3.
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (10)
1. A pipeline inner wall spraying method based on a reinforced bottom layer coating is characterized in that after a primary coating is sprayed on the inner wall of a pipe (150) to be sprayed, the coating sprayed by the primary coating is sprayed again, and then the coating is heated and then secondary coating spraying is carried out after heating.
2. The method for spraying the inner wall of the pipeline based on the reinforced primer is characterized in that,
the method comprises the following specific steps:
(1) the spraying unit is arranged inside a pipe (150) to be sprayed, so that the pipe (150) to be sprayed and the spraying unit rotate axially relatively, and the pipe (150) to be sprayed and the spraying unit translate relatively along the axial direction;
(2) enabling the inner wall of the pipe (150) to be sprayed to pass through a first sprayer (210) of a spraying unit, and spraying the coating to the inner wall of the pipe (150) to be sprayed by the first sprayer (210) to form a primary coating;
(3) enabling the inner wall of the pipe (150) to be sprayed, which forms the primary coating sprayed coating, to pass through a sprayer of the spraying unit, and spraying the primary coating sprayed coating on the inner wall of the pipe (150) to be sprayed by the sprayer together with the gas and the coating;
(4) enabling the inner wall of the pipe (150) to be sprayed after being sprayed by the sprayer to pass through a heater (230) of the spraying unit, and heating the sprayed primary coating sprayed coating by the heater (230);
(5) the inner wall of the pipe (150) to be sprayed, which is heated by the heater (230), passes through a second sprayer (240) of the spraying unit, and the second sprayer (240) sprays the coating on the heated primary coating sprayed coating.
3. The method for spraying the inner wall of the pipeline based on the reinforced primer is characterized in that in the step (1), the rotating speed of the pipe (150) to be sprayed and the spraying unit which rotate axially relative to each other is 10-100 r/min; the relative translation speed of the pipe (150) to be sprayed and the spraying unit along the axial direction is 80-800 mm/min.
4. The method for spraying the inner wall of the pipeline based on the reinforced primer is characterized in that in the step (2), the thickness of the primary coating sprayed layer formed on the inner wall of the pipe (150) to be sprayed by the first sprayer (210) is 0.4-0.6 mm.
5. The method for spraying the inner wall of the pipeline based on the reinforced primer is characterized in that the blower in the step (3) is obliquely blown.
6. The method for spraying the inner wall of the pipeline based on the intensified primer according to the claim 1 is characterized in that a blowing nozzle on a blower is used, the blowing nozzle comprises a Raoult nozzle, the Raoult nozzle comprises a contraction section (224) and an expansion section (223), the contraction starting end of the contraction section (224) is connected with a gas tank (320) through a vent pipeline (225), and the side part of the expansion section (223) is connected with a paint tank (310) through a paint pipeline (226).
7. The method for spraying the inner wall of the pipeline based on the reinforced primer as claimed in claim 1, wherein the heating temperature of the heater (230) in the step (4) is 45-80 ℃.
8. The method for spraying the inner wall of the pipeline based on the strengthened primer is characterized in that the heater (230) is an infrared heating pipe, the length of the heater (230) along the axial direction of the supporting rod (130) is L, wherein 9.5m is less than or equal to L is less than or equal to 10m, the distance from a blowing nozzle on a blowing device to the heater (230) is d2, wherein 0.3m is less than or equal to d2 is less than or equal to 0.35m, and the distance from a second nozzle (241) on a second spraying device (240) to the heater (230) is d3, wherein 0.3m is less than or equal to d3 is less than or equal to 0.35 m.
9. The method for spraying the inner wall of the pipeline based on the reinforced primer, according to the claim 1, is characterized in that in the step (5), after the second sprayer (240) sprays the paint to the heated primary paint spraying coating, the whole thickness of the coating is 0.8-1.2 mm.
10. The method for spraying the inner wall of the pipeline based on the reinforced primer is characterized in that the inclined angle of the inclined spraying is α, the distance between the spraying nozzle of the spraying and the inner wall of the pipe (150) to be sprayed is h, and the inclined angle α satisfies the condition that tan α is k.h, wherein k is more than 0 and less than or equal to 1.
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| CN202010242145.8A CN111482346A (en) | 2020-03-31 | 2020-03-31 | Pipeline inner wall spraying method based on reinforced primer coating |
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| CN202010242145.8A CN111482346A (en) | 2020-03-31 | 2020-03-31 | Pipeline inner wall spraying method based on reinforced primer coating |
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| CN112024242A (en) * | 2020-09-01 | 2020-12-04 | 长沙理工大学 | Preparation device and process of graphene heat transfer enhanced organic silicon resin composite tube |
| CN112024243A (en) * | 2020-09-01 | 2020-12-04 | 长沙理工大学 | Graphene/organic silicon resin multilayer composite pipe preparation device and technology |
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| CN112024242A (en) * | 2020-09-01 | 2020-12-04 | 长沙理工大学 | Preparation device and process of graphene heat transfer enhanced organic silicon resin composite tube |
| CN112024243A (en) * | 2020-09-01 | 2020-12-04 | 长沙理工大学 | Graphene/organic silicon resin multilayer composite pipe preparation device and technology |
| CN112044646A (en) * | 2020-09-01 | 2020-12-08 | 长沙理工大学 | Preparation device and process of graphene heat transfer enhanced epoxy resin composite tube |
| CN112138914A (en) * | 2020-09-01 | 2020-12-29 | 长沙理工大学 | Production equipment and method for graphene heat transfer enhanced multilayer composite pipe |
| CN112427198A (en) * | 2020-11-03 | 2021-03-02 | 长沙理工大学 | Compound pipe apparatus for producing of graphite alkene/organic silicon resin multilayer |
| CN112474143A (en) * | 2020-11-03 | 2021-03-12 | 长沙理工大学 | Production device and method for graphene heat transfer enhanced multilayer composite pipe |
| CN112547373A (en) * | 2020-11-03 | 2021-03-26 | 长沙理工大学 | Heat transfer enhanced multilayer composite pipe production equipment and process |
| CN112705390A (en) * | 2021-01-24 | 2021-04-27 | 裴海云 | Automatic spraying device for steel-plastic composite pipe |
| CN113262967A (en) * | 2021-05-28 | 2021-08-17 | 江苏润旺机械制造有限公司 | Spraying process of nickel-based alloy coating on inner wall of small-caliber steel pipe |
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Application publication date: 20200804 |