CN213803943U - Pickling and galvanizing switchable unit - Google Patents
Pickling and galvanizing switchable unit Download PDFInfo
- Publication number
- CN213803943U CN213803943U CN202022817680.XU CN202022817680U CN213803943U CN 213803943 U CN213803943 U CN 213803943U CN 202022817680 U CN202022817680 U CN 202022817680U CN 213803943 U CN213803943 U CN 213803943U
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- Prior art keywords
- roller
- pickling
- machine
- furnace
- galvanizing
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- 238000005554 pickling Methods 0.000 title claims abstract description 43
- 238000005246 galvanizing Methods 0.000 title claims abstract description 41
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000011701 zinc Substances 0.000 claims abstract description 57
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 57
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 11
- 238000002161 passivation Methods 0.000 claims description 10
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 66
- 239000010959 steel Substances 0.000 abstract description 66
- 238000004519 manufacturing process Methods 0.000 abstract description 28
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 238000000034 method Methods 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 235000008373 pickled product Nutrition 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 235000013861 fat-free Nutrition 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Abstract
The utility model discloses a switchable unit for pickling and galvanizing, which belongs to the field of steel production and comprises a pickling section, a galvanizing furnace, a zinc pot and a bypass roller; the galvanizing furnace comprises a furnace nose and a furnace nose tail section which are detachably connected, and bypass roller mounting bases are arranged on two sides of the zinc pot and used for mounting bypass rollers during pure pickling operation; the zinc pot is provided with a cover plate; the zinc pot is internally provided with a detachable sink roller, a correction roller, a stabilizing roller and two side roller arms of the sink roller, the correction roller and the stabilizing roller. The utility model discloses can realize realizing pickling product and hot-galvanize product conversion production at same pickling galvanization combined unit production line.
Description
Technical Field
The utility model relates to a steel production process, in particular to a machine set suitable for the conversion production of pickling products and hot galvanizing products on a pickling and galvanizing combined production line.
Background
With the rapid development of the steel industry and the reduction of the production cost, the abundant varieties and structures become main means for enhancing the competitiveness of the steel industry, the technology of replacing cold by heat becomes one of the main means for reducing the production cost of the steel industry, and the products which replace cold by heat in the market are mainly pickled products and hot galvanized products at present.
At present, domestic pickling products and galvanized products are respectively produced in an independent continuous unit: the pickling products are produced on a continuous pickling production line, and the galvanized products are produced on a continuous galvanizing production line, so that huge waste of places, equipment and personnel is caused. How to realize the mutual conversion and centralized production of acid washing and galvanization, equipment purchase is saved, production efficiency is improved, and the method becomes an important direction of competitive power of enterprises.
SUMMERY OF THE UTILITY MODEL
The technical task of the utility model is to the not enough of above prior art, through process optimization, equipment transformation, realize realizing pickling product and hot-galvanize product conversion production at same pickling galvanization combined unit production line.
The technical proposal of the utility model for solving the technical problem is that: the acid cleaning galvanizing switchable unit is characterized in that: comprises an acid washing section, a galvanizing furnace, a zinc pot and a bypass roller; the galvanizing furnace comprises a furnace nose and a furnace nose tail section which are detachably connected, and bypass roller mounting bases are arranged on two sides of the zinc pot and used for mounting bypass rollers during pure pickling operation; the zinc pot is provided with a cover plate; the zinc pot is internally provided with a detachable sink roller, a correction roller, a stabilizing roller and two side roller arms of the sink roller, the correction roller and the stabilizing roller.
In addition, the device also comprises an uncoiler, an inlet shear, a welding machine, a pickling inlet loop, a phosphorus breaking machine, a rinsing section, a pickling outlet loop, a leveling machine, a water washing device, an intermediate loop, an air knife, a cooling water quenching section, a polishing machine, a withdrawal and straightening machine, a passivation device, a dryer, a galvanized outlet loop, an inspection table, an oiling machine, an outlet shear and a coiling machine; the device comprises an uncoiler, an inlet shearing machine, a welding machine, a pickling inlet loop, a phosphorus breaking machine, a pickling section, a rinsing section, a pickling outlet loop, a leveling machine, a washing device, a middle loop, a galvanizing furnace, a zinc pot, an air knife, a cooling water quenching section, a finishing machine, a tension leveler, a passivation device, a dryer, a galvanizing outlet loop, an inspection table, an oiling machine, an outlet shearing machine and a coiling machine which are sequentially connected.
Compared with the prior art, the utility model discloses can realize carrying out pickling product and galvanized product conversion production on same unit according to the order condition, the profit condition of galvanized product and pickling product on the market to reduction in production cost increases enterprise competitiveness.
Drawings
FIG. 1 is a schematic view of the pickling line according to the present invention.
FIG. 2 is a schematic view of the local structure of the galvanizing furnace and the zinc pot during the galvanizing operation.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The utility model discloses a hardware relies on current basic sour flat line and galvanized wire technical equipment to redesign, and the line is jointly produced in improvement pickling galvanization, makes it realize pickling product and galvanized product conversion production. The technical process comprises the following steps: feeding → uncoiling → shearing → welding → crushing scale → acid washing → rinsing → leveling → water washing → galvanizing/non-galvanizing → finishing → straightening → passivating → drying → oiling/non-oiling → shearing → coiling.
As shown in fig. 1 and 2, the utility model relates to a changeable unit of pickling galvanization, including decoiler 1, entry shearing 2, welding machine 3, pickling entry loop 4, broken phosphorus machine 5, pickling section 6, rinsing section 7, pickling export loop 8, levelling machine 9, rinsing device 10, middle loop 11, galvanizing furnace 12, zinc pot 13, air knife 14, cooling water quenching section 15, finishing machine 16, tension leveler 17, passivating device 18, drying-machine 19, galvanizing export loop 20, inspection desk 21, oiling machine 22, export are cut 23, coiling machine 24 that connect gradually. The utility model discloses can reform transform through current basic acid flat line and galvanized wire, the concrete inner structure of the concrete part of unit is prior art, and is different and different according to the production line, and not limited, does not describe here again tiredly.
An uncoiler 1: and opening the raw material steel coil by using an uncoiler for loading the raw material steel coil.
Entrance shear 2: the head and tail defects of the strip steel are removed, and the strip steel section is ensured to be parallel and level when the strip steel is welded by a welding machine.
And (3) welding machine: the front steel belt and the rear steel belt are connected to keep the continuity of the raw materials entering the next working procedure.
Acid washing inlet loop 4: the steel belt is stored, and the continuous operation of the production line is ensured.
And (3) a phosphorus breaking machine 5: and (3) damaging a compact ferric oxide skin layer on the surface of the hot-rolled strip steel by a scale breaker, and greatly improving the strip shape.
And the pickling section 6 is used for further removing the residual iron oxide scales on the surface of the strip steel.
And a rinsing section 7: and cleaning acid liquor and impurities remained on the surface of the strip steel.
Acid washing outlet loop 8: the steel belt is stored, and the continuous operation of the production line is ensured.
A leveling machine 9: by the flattening process, the strip shape of the strip steel is further improved, and the surface roughness of the strip steel required by the subsequent process is met and improved.
The water washing device 10: and residual iron powder and foreign matters on the surface of the strip steel after being cleaned and leveled ensure the surface of the strip steel to be clean.
Intermediate loop 11: the steel belt is stored, and the continuous operation of the production line is ensured.
And (3) galvanizing furnace 12: the furnace temperature is 500-800 ℃, and H is utilized in the process of passing the steel plate through a galvanizing furnace2Reducing the iron oxide on the surface of the steel plate. Wherein the furnace nose 121 and the furnace nose end section 122 are detachably connected, preferablyThe furnace nose end section in the chemical scheme is a telescopic socket, the telescopic mode is a worm and gear structure, and the furnace nose end section is driven to lift and lock by a motor. When the galvanized product is produced, the galvanized product and the galvanized product are connected, the strip steel heated in the galvanizing furnace enters the zinc pot for galvanizing through the furnace nose 121 and the furnace nose end section 122, and the furnace nose end section 122 is detached from the installation tail end of the furnace nose 121 before the pickled product is prepared to be produced.
And (3) a zinc pot 13: the zinc ingot is melted at 480-500 ℃. The heat-treated steel sheet is passed through a zinc pot and then coated with a zinc layer. The zinc pot 13 is provided with an openable cover plate. The zinc pot 13 is internally provided with six detachable three rollers (a sink roller 132, a correction roller 133 and a stabilizing roller 134) (two side roller arms of the sink roller, the correction roller and the stabilizing roller). The two sides of the zinc pot 13 are provided with a mounting base of the bypass roller 131, and the bypass roller 131 is mounted during the pure pickling operation. When acid-washing products are produced, the cover plate closes the zinc pot 13, zinc liquid in the zinc pot 13 is heated and insulated, meanwhile, a bypass roller 131 is installed, and strip steel is conveyed through the bypass roller 131. When the galvanized product is produced, the bypass roller is detached, and the strip steel passes through the zinc pot 13.
Air knife 14: excess zinc coated on the surface of the steel plate is removed by air cutting. The air knife 14 is closed-loop controlled by a zinc layer thickness gauge, and the thickness of the zinc layer can be adjusted.
Cooling water quenching section 15: the steel plate is cooled by circulating water, and the temperature of the cooled strip steel is less than or equal to 50 ℃ so as to meet the requirements of subsequent processes.
A finisher 16: the method is used for improving the thickness precision and the surface appearance of the strip steel.
A withdrawal and straightening machine 17: and straightening the steel plate by using a straightening, bending and straightening machine, improving the tensile property and perfecting the product appearance.
Passivation device 18: passivation solution passivation is carried out on the surface of the galvanized product to generate a passivation layer, so that the galvanized product is prevented from being corroded.
The dryer 19: and drying the surface passivation layer of the galvanized product to ensure that the temperature of the strip steel is over 70 ℃.
Galvanized outlet loop 20: the steel belt is stored, and the continuous operation of the production line is ensured.
The inspection stage 21: and (5) checking the position of the surface quality of the strip steel by staff.
An oiling machine 22: the surface of the strip steel is coated with oil to prevent the strip steel from being rusted.
The outlet scissors 23: and (4) performing band steel bundling to ensure that each band steel coil meets the contract weight.
The coiler 24: and (5) coiling the strip steel.
The utility model selects to produce the pickling products or the galvanized products on the pickling and galvanized product line according to the order condition and the profit condition of the pickling products and the galvanized products. In order to realize the mutual switching production in the production process of the two products, the requirements of the mutual switching production of the two products are formulated.
The utility model relates to a switching method core lies in galvanizing furnace 12 and zinc pot 13 region, and foretell other equipment can carry out corresponding deletion and increase according to the demand, for example produces non-fat liquoring product and can not need oiling machine 22, examines surface quality to non-artifical production and can not need the inspection desk. The utility model discloses only describe in order to produce the line better, just will optimize the whole lists of scheme.
When acid-washing products are produced, the strip steel passes through a galvanizing furnace 12 which does not heat. Meanwhile, the strip steel does not pass through the zinc pot 13, the upper cover plate of the zinc pot is covered, and the strip steel passes through the bypass roller 131 above the zinc pot and is directly connected with the tower top roller. The zinc liquid in the zinc pot is always kept in a heating state, and the heat preservation temperature of the zinc liquid is set to be 450 ℃ because: if the zinc liquid in the zinc pot is pumped out and is melted when the galvanized product is produced, the recovery takes 3 months, and the heat preservation mode of the zinc liquid can ensure that the recovery can be realized after the acid pickling conversion galvanizing time is 3 days, so that the heat preservation conversion efficiency of the zinc liquid is higher in consideration of time and cost. When the galvanized product is produced, the strip steel passes through a galvanizing furnace, and the galvanizing furnace adopts an induction coil for heating. After being heated by a heating galvanizing furnace, the strip steel enters a zinc pot through a furnace nose 121 and is plated with a zinc layer through a three-roller six-arm device and an air knife device in the zinc pot. The galvanized steel strip is directly connected with the tower top roller.
The method for converting the pickled product into the galvanized product comprises the following steps:
(1) breaking the belt:
after the machine set is shut down, slowly sleeving the strip steel above the zinc pot (the straightened strip steel is subjected to tension release to keep the strip steel in a loose state), keeping about 10 meters of strip steel, and pulling the strip steel to the ground in front of the bypass roller 131 to break the strip steel;
(2) threading and welding:
the strip steel strip heads are connected by 20 m strip penetrating ropes at the strip breakage part of the bypass roller 131, which is close to one side of the furnace nose 121; moving the strip steel head to the front of the furnace, and pulling the strip steel into the installation position of the furnace nose end section 122; after a lacing rope penetrates through the inner part of the furnace nose end section 122, the furnace nose 121 is loaded back to the furnace nose end section 122 part, and the furnace nose 121 and the furnace nose end section 122 part are fixedly inserted by a safety pin and are fastened by a bolt; the strip steel passes through the furnace nose tail section 122 from the furnace, the strip steel in the furnace is inching, and the strip tail and the strip head are welded together;
(3) immersing:
removing the bypass roller 131 and the cover plate above the zinc pot; slowly dropping the furnace nose end section 122;
(4) and (3) checking the air tightness in the furnace:
in the production of the acid pickling product converted galvanized product, because a galvanizing furnace is heated and hydrogen is filled in the galvanizing furnace, the airtightness in the furnace is checked to ensure the safety of the furnace. The specific steps for checking the air tightness in the furnace are as follows: firstly, closing a nitrogen and hydrogen pipeline valve in front of a nitrogen and hydrogen mixing station; connecting the hydrogen main pipe with the nitrogen main pipe by using a hose; opening a nitrogen main pipe valve, opening a diffusion pipeline after the pressure in the nitrogen pipeline is balanced, and purging for 20 minutes; opening a hose valve connected with a hydrogen pipeline, opening a diffusion pipeline after the pressure is balanced, and purging for 20 minutes; after confirming that the nitrogen and hydrogen pipelines and the valves are in working states, arranging a specially-assigned person to open the valves on site, and arranging the specially-assigned person to change the surfaces in an operation room to monitor the pressure and the gas flow in the furnace; sixthly, slowly opening a nitrogen valve in front of the nitrogen-hydrogen mixing station, and completely opening the nitrogen valve after confirming no error in the operating room; controlling the pressure in the furnace to be 30-100pa (less than or equal to 60pa in normal operation); seventhly, after the zinc-plating furnace is purged by nitrogen for 2 hours, confirming the oxygen content in the furnace, if the oxygen content is less than 2000ppm (0.2%), introducing hydrogen, and opening a valve under the bench in a matching way, and completely opening the valve after the correctness is confirmed; and controlling the hydrogen content in the furnace to be 5-10% in normal operation. Galvanizing furnaces are prior art and therefore only the steps are described and the specific structure and connections are not described here in a comprehensive manner.
(5) Oven drying operation:
after receiving a production line start command, preparing the furnace drying operation 8 hours in advance; starting all radiant tubes of the galvanizing furnace 12, and maintaining the power at 90%; when the oxygen content in the furnace is reduced to be below 100ppm and the temperature in the furnace is higher than 200 ℃, the starting condition can be met;
(6) and (3) repacking:
after the purging in the furnace and the baking of the galvanizing furnace are finished, the three-roller six-arm is installed back to the zinc pot 13, and the air knife equipment is adjusted; the above installation methods and equipment adjustment methods are well known in the art and will not be discussed here in detail.
(7) Debugging equipment:
and after checking and confirming that the equipment of the cooling water quenching section 15, the finishing machine 16 and the passivation device 18 meet the use conditions, starting the whole line organization to produce galvanized products.
The method for converting the galvanized product into the pickled product comprises the following steps:
(1) stopping the machine and cooling:
closing a hydrogen valve of the galvanizing furnace 12 and all heating equipment in the furnace after stopping the machine, starting the nitrogen furnace to perform large purging for 2 hours, replacing the hydrogen residues, and naturally cooling the galvanizing furnace until the temperature is reduced to below 50 ℃;
(2) lifting:
raising the furnace nose endpiece 122 to a position above the zinc level;
(3) zinc pot treatment:
removing the 13 three-roller six arms of the zinc pot and then hanging out; installing a cover plate 13 of the zinc pot above the zinc pot, and carrying out long-term heat preservation on zinc liquid, wherein the heat preservation temperature is set to be 450 ℃; in an optimized scheme, the air knife tool is detached from the base of the air knife 14, and the air knife gap is calibrated.
(4) Broken belt
Slowly sleeving a strip steel above the zinc pot (the straightened strip steel is subjected to tension relief so as to keep the strip steel in a loose state), reserving the strip steel about 10 meters, and pulling the strip steel to the ground in front of the zinc pot to break the strip steel;
(5) threading and welding:
connecting the broken strip steel close to the end section 122 of the furnace nose by using a 20-meter strip threading rope, moving the strip steel in front of the furnace, and moving the broken strip steel to the connection position of the end section 122 of the furnace nose and the furnace nose 121; then the furnace nose end section 122 is detached from the lacing line; a bypass roller 131 is arranged above the zinc pot; leading the strip head of the strip steel to the bypass roller 131, and then welding the strip head and the strip tail together;
(5) debugging equipment:
and (3) emptying water in the water quenching tank, selecting a finishing machine without using, dismantling a passivating machine roller system, and starting the machine in a full-line organization manner to produce acid-washing products.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. The acid cleaning galvanizing switchable unit is characterized in that: comprises an acid washing section, a galvanizing furnace, a zinc pot and a bypass roller; the galvanizing furnace comprises a furnace nose and a furnace nose tail section which are detachably connected, and bypass roller mounting bases are arranged on two sides of the zinc pot and used for mounting bypass rollers during pure pickling operation; the zinc pot is provided with a cover plate; the zinc pot is internally provided with a detachable sink roller, a correction roller, a stabilizing roller and two side roller arms of the sink roller, the correction roller and the stabilizing roller.
2. The acid pickling zinc plating switchable unit of claim 1, wherein: the device also comprises an uncoiler, an inlet shear, a welding machine, a pickling inlet loop, a phosphorus breaking machine, a rinsing section, a pickling outlet loop, a leveling machine, a washing device, an intermediate loop, an air knife, a cooling water quenching section, a polishing machine, a withdrawal and straightening machine, a passivation device, a dryer, a galvanized outlet loop, an inspection table, an oiling machine, an outlet shear and a coiling machine; the device comprises an uncoiler, an inlet shearing machine, a welding machine, a pickling inlet loop, a phosphorus breaking machine, a pickling section, a rinsing section, a pickling outlet loop, a leveling machine, a washing device, a middle loop, a galvanizing furnace, a zinc pot, an air knife, a cooling water quenching section, a finishing machine, a tension leveler, a passivation device, a dryer, a galvanizing outlet loop, an inspection table, an oiling machine, an outlet shearing machine and a coiling machine which are sequentially connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022817680.XU CN213803943U (en) | 2020-11-30 | 2020-11-30 | Pickling and galvanizing switchable unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022817680.XU CN213803943U (en) | 2020-11-30 | 2020-11-30 | Pickling and galvanizing switchable unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213803943U true CN213803943U (en) | 2021-07-27 |
Family
ID=76940948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022817680.XU Expired - Fee Related CN213803943U (en) | 2020-11-30 | 2020-11-30 | Pickling and galvanizing switchable unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213803943U (en) |
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2020
- 2020-11-30 CN CN202022817680.XU patent/CN213803943U/en not_active Expired - Fee Related
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Granted publication date: 20210727 |