CN218308783U - Epoxy powder surface coating homogeneity device in steel pipe - Google Patents
Epoxy powder surface coating homogeneity device in steel pipe Download PDFInfo
- Publication number
- CN218308783U CN218308783U CN202222362880.XU CN202222362880U CN218308783U CN 218308783 U CN218308783 U CN 218308783U CN 202222362880 U CN202222362880 U CN 202222362880U CN 218308783 U CN218308783 U CN 218308783U
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- powder
- recovery
- steel pipe
- pipeline
- pipe
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- 239000000843 powder Substances 0.000 title claims abstract description 100
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 239000004593 Epoxy Substances 0.000 title claims abstract description 22
- 239000011248 coating agent Substances 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 title claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 37
- 238000005507 spraying Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 29
- 238000004064 recycling Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 231100000241 scar Toxicity 0.000 abstract description 3
- 238000005243 fluidization Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Electrostatic Spraying Apparatus (AREA)
- Nozzles (AREA)
Abstract
The utility model relates to a device for coating the surface of epoxy powder in a steel pipe, which comprises an adjustable bracket, a target rod horizontally arranged on the adjustable bracket, a spraying mechanism arranged in the target rod and a recovery device arranged on the target rod and used for recovering the spraying powder; the recovery unit include with the recovery pipeline of target pole intercommunication and with the recovery mouth that spraying mechanism set up together, the recovery pipeline is the integral type, and the recovery mouth is connected with pipeline one, and the recovery mouth all adopts the glass steel material with pipeline one, a pipeline other end is located the target pole, and the recovery pipeline other end is connected with the recovery tower, and the recovery pipeline inhales the powder that spraying mechanism department was waved to the recovery tower in through the draught fan. The utility model discloses an add on the target bar and established integral type powder recovery pipeline, can effectively absorb floated powder totally, avoid unnecessary powder high temperature to melt and drip the steel pipe internal surface and form the massive powder and melt the scar and influence the quality of product to improve the life of product.
Description
Technical Field
The utility model belongs to the technical field of the spraying technique in the steel pipe and specifically relates to an interior epoxy powder surface coating homogeneity device of coating of steel pipe.
Background
In the pipeline engineering, steel pipes with various diameters are applied to water, gas and oil transportation, an anti-corrosion layer is usually brushed on the outer wall of the steel pipe at an engineering site, the inner wall of the steel pipe can not carry out anti-corrosion treatment on the steel pipe, the steel pipe is exposed outside or buried underground for a long time, the steel pipe is easy to rust and corrode, the steel pipe buried underground is easy to corrode, and the service life is greatly shortened. It is through setting up first electric putter, make it drive the shower nozzle and carry out the spraying in the steel pipe like the chinese utility model patent of publication No. CN210449645U, the anticorrosive problem of steel pipe inner wall has been solved, nevertheless when coating epoxy powder in the steel pipe, the floated epoxy powder of mouth of pipe is retrieved unclearly, high temperature melts the powder that will float and drips on the steel pipe surface, cause the big piece powder to melt the scar, lead to steel pipe internal surface unqualified quality, thereby influence the life of steel pipe.
Therefore, the spraying device can effectively absorb floating epoxy powder completely, avoids powder slag, enables the floating epoxy powder to be sprayed on the inner wall of the steel pipe uniformly, and prolongs the service life of the steel pipe.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a spraying device is provided which can effectively absorb floating epoxy powder completely, avoid powder slag, make it even in the spraying of steel pipe inner wall, improve steel pipe life.
In order to solve the above problems, the utility model adopts the following technical proposal:
a steel pipe internal epoxy powder coating surface coating uniformity device comprises an adjustable support, a target rod horizontally arranged on the adjustable support, a spraying mechanism arranged in the target rod and a recovery device arranged on the target rod and used for recovering spraying powder;
the recovery unit include with the recovery pipeline of target pole intercommunication and with the recovery mouth that spraying mechanism set up together, the recovery pipeline is the integral type, it is connected with pipeline one to retrieve the mouth, it all adopts the glass steel material to retrieve mouth and pipeline one, a pipeline other end is located the target pole, the recovery pipeline other end is connected with the recovery tower, the powder that recovery pipeline will spray mechanism department through the draught fan is waved inhales to the recovery tower in.
As an embodiment of the present invention, the spraying mechanism includes a spray gun disposed in the target rod and a powder supply mechanism connected to the spray gun through a connection hose, the spray gun is fixed together with the recycling port and is parallel and level.
As an embodiment of the present invention, the length of the spray gun is set to 4m.
As an embodiment of the present invention, the spraying mechanism is further provided with a recycling mechanism for recycling the recovered powder.
As an embodiment of the utility model, circulation mechanism includes the powder falling pipe, falls powder recovery tube, fluidization case and goes out the powder pipe, the powder falling pipe upper end is connected with the recovery tower lower extreme, the powder falling pipe lower extreme is connected with the powder falling recovery tube, the powder falling recovery tube is connected with the fluidization case, the fluidization case is connected with a powder pipe, it is connected with the spray gun to go out the powder pipe.
As an embodiment of the present invention, the adjustable support is further provided with a counterweight roller for stabilizing the target rod, the counterweight roller is set to be tubular, and the counterweight block can be placed in the tube for increasing or reducing the counterweight thereof.
As an embodiment of the utility model, counterweight roller front end is provided with limit baffle, limit baffle is used for making the steel pipe target in place, prevents that the steel pipe from continuing to advance, limit baffle sets up on the fixing base.
As an embodiment of the utility model, adjustable bracket includes two risers of base, vertical setting on the base and sets up the fixed plate on two riser tops, be provided with the positioning mechanism who is used for making target bar and steel pipe aim at the location on the riser.
As an implementation mode of the present invention, the positioning mechanism includes a connecting shaft, a fixed block is disposed in the middle of the connecting shaft, the fixed block is fixedly connected to the target rod, sliders are fixedly disposed at both ends of the connecting shaft, two vertical plates are provided with slides in sliding fit with the sliders, a second lead screw is vertically disposed on the sliders, the upper portion of the second lead screw penetrates through the fixed plate, a second nut is disposed on the upper portion of the second lead screw, and the target rod is raised or lowered by adjusting the second nut;
the lower end of the target rod is fixedly connected with the counterweight roller through the connecting frame to form a whole, a first lead screw is horizontally arranged at the lower part between the two vertical plates, the counterweight roller is positioned on the first lead screw, a first nut is further arranged on the two vertical plates, the first lead screw is matched with the first nut, and the target rod is moved left and right by rotating the first lead screw.
As an embodiment of the present invention, the number of the adjustable brackets is 2.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model discloses an add on the target bar and establish integral type powder recovery pipeline, epoxy production specification improves phi 325 from phi 377 in the steel pipe, has increased the product specification, can effectively absorb floated powder totally, and recovery mouth adopts the glass steel material, utilizes glass steel pipe high temperature resistance and utilizes draught fan suction will float in the unnecessary powder of shower nozzle department inhales the recovery tower through the target bar inside, avoids unnecessary powder high temperature melting to drip to the steel pipe internal surface and forms the quality that the large piece powder melts the scar and influences the product to improve the life of product;
the utility model is simple in operation, guaranteed the safe and reliable of spraying in-process, retrieved the powder simultaneously through the powder falling pipe and circulated the use in fluidization case, saved the material, on spraying the steel pipe inner wall again with the material of retrieving, reduced manufacturing cost.
Drawings
Fig. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a side view of an embodiment of the invention.
Wherein: the device comprises an adjustable support 1, a base 1-1, a vertical plate 1-2, a first screw rod 1-3, a connecting shaft 1-4, a fixed block 1-5, a second screw rod 1-6, a limit baffle 2, a counterweight roller 3, a target rod 4, a spray gun 5, a recovery port 6, a first pipeline 7, a fluidization box 8, a powder falling recovery pipe 9, a recovery tower 10, a recovery pipeline 11, a powder falling pipe 12, a sliding block 13, a slideway 14, a powder outlet pipe 16, a fixed plate 17, a first nut 18, a second nut 19, a connecting frame 20 and a fixed seat 21.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the following description of the present invention with reference to specific embodiments is given for clear and complete description.
As shown in fig. 1 to 2, a device for coating epoxy powder on the surface of a steel pipe internally comprises an adjustable bracket 1, a target rod 4 horizontally arranged on the adjustable bracket 1, a spraying mechanism arranged in the target rod 4 and a recovery device arranged on the target rod 4 and used for recovering the spraying powder;
recovery unit include with the recovery pipeline 11 of 4 intercommunications of target pole and set up recovery mouth 6 together with spraying mechanism, recovery pipeline 11 is the integral type, recovery mouth 6 is connected with a pipeline 7, recovery mouth 6 all adopts the glass steel material with a pipeline 7, a pipeline 7 other end is located target pole 4, the 11 other ends of recovery pipeline are connected with recovery tower 10, recovery pipeline 11 inhales the powder that spraying mechanism department was wandered to in recovery tower 10 through the draught fan.
Through the technical scheme, the integrated powder recovery pipeline 11 is additionally arranged on the target rod 4, welding is preferred, the epoxy production specification in the steel pipe is improved from phi 377 to phi 325, the product specification is increased, floating powder can be effectively absorbed completely, the recovery port 6 is made of glass fiber reinforced plastic, redundant powder floating at the nozzle is sucked into the recovery tower 10 through the high-temperature resistance of the glass fiber reinforced plastic pipe and the suction force of a draught fan, the phenomenon that the redundant powder is melted at high temperature and drips on the inner surface of the steel pipe to form large powder scabs to affect the product quality is avoided, and therefore the service life of the product is prolonged;
as shown in fig. 1, the spraying mechanism includes a spray gun 5 disposed in the target rod 4 and a powder supply mechanism (the connection hose and the powder supply mechanism are not shown) connected with the spray gun 5 through a connection hose, the powder supply mechanism is disposed on one side of the end of the target rod 4, the connection hose enters from the end of the target rod 4 and is connected with the spray gun 5, the spray gun 5 and the recovery port 6 are fixed together and flush, in this embodiment, the spray gun 5 is disposed at 8, the recovery port 6 is flush with the right end of the spray gun 5, of course, the recovery pipe 6 and the spray gun 5 penetrate out of a part of the target rod 4, and through such an arrangement, the recovery pipe 6 is convenient for recovering the surplus powder sprayed from the spray gun 5, and the distance between the two is shortened, so that the surplus powder can be recovered completely.
Further, the length of the lance 5 is set to 4m, and in this embodiment, the length of the lance 5 is increased from 1.2m to 4m. When the spray gun 5 is set to be 1.2m, epoxy powder is coated in the steel pipe, and the powder is easy to over-burn when the steel pipe is sprayed by the medium-frequency heating ring with the length of about 0-10 cm and the temperature is too high (about 200 ℃); the temperature of the steel pipe passing through the front end of the intermediate frequency heating ring is too low (about 130 ℃) at about 10 cm-30 cm, so that powder spraying is not carried out or the thickness of the coating is uneven; and the length of the spray gun 5 is prolonged to 4m, the steel pipe has 2s idle time after passing through the intermediate frequency heating ring, the temperature of the high-temperature area near the spray head is transmitted to the low-temperature area near the intermediate frequency heating ring, so that the surface temperature of the steel pipe is uniform, the temperature of the powder spraying part meets the requirement, and the uniform thickness of the coating of the powder spraying firmness is ensured.
As shown in fig. 1 and 2, the spraying mechanism is further provided with a circulating mechanism for recycling the recovered powder. In this embodiment, the circulating mechanism includes a powder dropping pipe 12, a powder dropping recovery pipe 9, a fluidization box 8 and a powder outlet pipe 16, the upper end of the powder dropping pipe 12 is connected with the lower end of the recovery tower 10, the lower end of the powder dropping pipe 12 is connected with the powder dropping recovery pipe 9, the powder dropping recovery pipe 9 is connected with the fluidization box 8, the fluidization box 8 is connected with the powder outlet pipe 16, and the powder outlet pipe 16 is connected with the spray gun 5. The operation is simple on the whole, realizes automaticly, has guaranteed the safe and reliable of spraying in-process, recycles the powder into fluidization case 8 through the powder falling pipe 12 simultaneously and recycles, has saved the material, and the material that will retrieve is sprayed on the steel pipe inner wall again, has reduced manufacturing cost.
As shown in fig. 1, the adjustable bracket 1 is further provided with a counterweight roller 3 for stabilizing a target rod 4, the counterweight roller 3 is tubular, a counterweight block can be placed in the pipe for increasing or reducing the counterweight, the counterweight roller 3 is arranged to stabilize the stability of the whole device, and the counterweight block is increased or reduced in the counterweight roller 3, so that the counterweight roller 3 is matched with the weights of the target rod 4 and the spray gun 5.
The front end of the counterweight roller 3 is provided with a limit baffle 2, the limit baffle 2 is used for enabling the steel pipe to be in place and preventing the steel pipe from continuing to advance, and the limit baffle 2 is arranged on the fixed seat 21. In this embodiment, the steel tube is placed on the feeding trolley, the trolley advances first, and stops advancing to the position of the limiting baffle 2, and the limiting baffle 2 plays a limiting role.
As shown in fig. 1, the adjustable bracket 1 includes a base 1-1, two vertical plates 1-2 vertically disposed on the base 1-1, and a fixing plate 17 disposed at the top ends of the two vertical plates 1-2, wherein a positioning mechanism for aligning and positioning the target rod 4 and the steel pipe is disposed on the vertical plates 1-2. In the present embodiment, the adjustable brackets 1 are provided in 2 numbers, respectively at the front and rear portions of the weight roller 3 (see fig. 1).
Further, as shown in fig. 1 and 2, the positioning mechanism includes a connecting shaft 1-4, a fixing block 1-5 is disposed in the middle of the connecting shaft 1-4, the fixing block 1-5 is fixedly connected with the target rod 4, sliding blocks 13 are fixedly disposed at two ends of the connecting shaft 1-4, a slideway 14 in sliding fit with the sliding blocks 13 is disposed on two vertical plates 1-2, a second lead screw 1-6 is vertically disposed on the sliding blocks 13, the upper portion of the second lead screw 1-6 penetrates through the fixing plate 17, a second nut 19 is disposed on the upper portion of the second lead screw 1-6, the target rod 4 is raised or lowered by adjusting the second nut 19, and specifically, the fixing plate 17 plays a role in limiting and supporting the second nut 19.
The lower end of the target rod 4 is fixedly connected with the counterweight roller 3 through a connecting frame 20 to form a whole, a first screw rod 1-3 is horizontally arranged at the lower part between the two vertical plates 1-2, the counterweight roller 3 is positioned on the first screw rod 1-3, a first nut 18 is further arranged on the two vertical plates 1-2, the first screw rod 1-3 is matched with the first nut 18, the target rod 4 is moved leftwards and rightwards by rotating the first screw rod 1-3, and specifically, the target rod 4 is finely adjusted leftwards and rightwards by rotating the first screw rod 1-3. Through setting up positioning mechanism, make target rod 4 and be located the mouth of pipe of the accurate alignment steel pipe of spray gun 5 in target rod 4, make it get into in the steel pipe smoothly.
The working process comprises the following steps: the steel pipe is placed on a feeding trolley through a crane, the feeding trolley is started to move forwards, the steel pipe is driven to move forwards, a target rod 4 and a spray gun 5 are enabled to enter the steel pipe and come out from the other end of the steel pipe, the steel pipe automatically stops at a limit position (namely the position of a limit baffle 2), the feeding trolley is started by a trolley button to move backwards, a rotary tug is started to rotate the steel pipe after the end part of the steel pipe reaches a medium frequency inductor, the steel pipe rotates and moves backwards uniformly, the steel pipe end reaches the powder spraying position of the spray gun 5, a spraying mechanism is started to spray powder, the steel pipe rotates and moves backwards, powder recovery equipment is started, the powder enters the target rod 4 through a recovery port 6, under the action of suction force of an induced draft fan, the powder in the target rod 4 is sucked to a recovery tower 10 through a recovery pipeline 11, the powder spraying is stopped after the steel pipe is sprayed, the recovery equipment is closed, and the trolley moves to the limit automatic stop.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art may still modify the technical solutions described in the foregoing embodiments, or may substitute some technical features of the foregoing embodiments; such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. The utility model provides a steel pipe internal coating epoxy powder surface coating homogeneity device which characterized in that: the device comprises an adjustable bracket, a target rod horizontally arranged on the adjustable bracket, a spraying mechanism arranged in the target rod and a recovery device arranged on the target rod and used for recovering spraying powder;
the recovery unit include with the recovery pipeline of target pole intercommunication and with the recovery mouth that spraying mechanism set up together, the recovery pipeline is the integral type, it is connected with pipeline one to retrieve the mouth, it all adopts the glass steel material to retrieve mouth and pipeline one, a pipeline other end is located the target pole, the recovery pipeline other end is connected with the recovery tower, the powder that recovery pipeline will spray mechanism department through the draught fan is waved inhales to the recovery tower in.
2. The device for coating the surface of the steel pipe with the epoxy powder as claimed in claim 1, wherein: the spraying mechanism comprises a spray gun arranged in the target rod and a powder supply mechanism connected with the spray gun through a connecting hose, and the spray gun is fixed together with the recovery port and is parallel and level.
3. The device for coating the surface of the steel pipe with the epoxy powder uniformly according to claim 2, wherein the device comprises: the lance length was set to 4m.
4. The device for coating the surface of the steel pipe with the epoxy powder as claimed in claim 1, wherein: and the spraying mechanism is also provided with a circulating mechanism for recycling and recovering the powder.
5. The device for coating the surface of the steel pipe with the epoxy powder uniformly according to claim 4, wherein the device comprises: the circulating mechanism comprises a powder dropping pipe, a powder dropping recovery pipe, a fluidizing tank and a powder outlet pipe, wherein the upper end of the powder dropping pipe is connected with the lower end of the recovery tower, the lower end of the powder dropping pipe is connected with the powder dropping recovery pipe, the powder dropping recovery pipe is connected with the fluidizing tank, the fluidizing tank is connected with the powder outlet pipe, and the powder outlet pipe is connected with the spray gun.
6. The device for coating the surface of the steel pipe with the epoxy powder as claimed in claim 1, wherein: the adjustable support is further provided with a balance weight roller for stabilizing the target rod, the balance weight roller is tubular, and a balance weight block can be placed in the pipe and used for increasing or reducing the balance weight of the balance weight roller.
7. The device for coating the surface of the steel pipe with the epoxy powder as claimed in claim 6, wherein: the front end of the counterweight roller is provided with a limit baffle which is used for enabling the steel pipe to be in place and preventing the steel pipe from continuing to advance, and the limit baffle is arranged on the fixed seat.
8. The device for coating the surface of the steel pipe with the epoxy powder as claimed in claim 1, wherein: the adjustable support comprises a base, two vertical plates vertically arranged on the base and a fixing plate arranged at the top ends of the two vertical plates, wherein a positioning mechanism used for aligning and positioning the target rod and the steel pipe is arranged on each vertical plate.
9. The apparatus of claim 8, wherein the apparatus comprises: the positioning mechanism comprises a connecting shaft, a fixed block is arranged in the middle of the connecting shaft and fixedly connected with the target rod, sliding blocks are fixedly arranged at two ends of the connecting shaft, sliding ways in sliding fit with the sliding blocks are arranged on the two vertical plates, a second lead screw is vertically arranged on the sliding blocks, the upper portion of the second lead screw penetrates through the fixed plate, a second nut is arranged on the upper portion of the second lead screw, and the target rod is lifted or lowered by adjusting the second nut;
the lower end of the target rod is fixedly connected with the counterweight roller through the connecting frame to form a whole, a first lead screw is horizontally arranged at the lower part between the two vertical plates, the counterweight roller is positioned on the first lead screw, a first nut is further arranged on the two vertical plates, the first lead screw is matched with the first nut, and the target rod is moved left and right by rotating the first lead screw.
10. The apparatus of claim 9, wherein the apparatus comprises: the number of the adjustable supports is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222362880.XU CN218308783U (en) | 2022-09-06 | 2022-09-06 | Epoxy powder surface coating homogeneity device in steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222362880.XU CN218308783U (en) | 2022-09-06 | 2022-09-06 | Epoxy powder surface coating homogeneity device in steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218308783U true CN218308783U (en) | 2023-01-17 |
Family
ID=84832214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222362880.XU Active CN218308783U (en) | 2022-09-06 | 2022-09-06 | Epoxy powder surface coating homogeneity device in steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218308783U (en) |
-
2022
- 2022-09-06 CN CN202222362880.XU patent/CN218308783U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A device for uniformity of surface coating of epoxy powder inside steel pipes Effective date of registration: 20231222 Granted publication date: 20230117 Pledgee: Cangzhou Bank Co.,Ltd. Tangshan high tech sub branch Pledgor: TANGSHAN JINGHUA STEEL PIPE CO.,LTD. Registration number: Y2023980073660 |