CN111304570A

CN111304570A - Hot galvanizing production process with high automation degree

Info

Publication number: CN111304570A
Application number: CN202010337843.6A
Authority: CN
Inventors: 戴海峰; 陈雷
Original assignee: Xuzhou Remarkable Metal Products Co ltd
Current assignee: Xuzhou Remarkable Metal Products Co ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-06-19

Abstract

The invention discloses a hot galvanizing production process with high automation degree, relating to the technical field of hot galvanizing processes; the problems of high energy consumption and poor quality of the process are solved; the method specifically comprises the following steps: confirming supplied materials, including processing capacity confirmation, processing information confirmation and the condition of a piece to be plated; unloading, receiving incoming materials, placing in a standard way, and filing and storing; confirming a piece to be plated; the hanging part is used for fastening and hanging the part to be plated, the workpiece is hung at a certain angle, no adhesion and no air dead angle exist between the parts, and the structural part is required to be provided with a galvanizing fabrication hole. The invention has the advantages of low cost, durability, high efficiency and the like, and can pertinently and detailedly reduce or delay the occurrence time of white rust and keep a coating with good appearance for the re-plating pieces with different treatment requirements, such as the re-plating pieces needing to be subjected to zinc stripping, the re-plating pieces without zinc stripping, the pieces to be plated with grease on the surface, the pieces to be plated without grease and the re-plating pieces of evaporative cold air cooling products.

Description

Hot galvanizing production process with high automation degree

Technical Field

The invention relates to the technical field of hot galvanizing processes, in particular to a hot galvanizing production process with high automation degree.

Background

Along with the rapid development of cold-rolled strip steel, the hot galvanizing industry is developed in a large scale, the hot galvanizing is also called hot dip galvanizing and hot dip galvanizing, and is an effective metal corrosion prevention mode, the hot dip galvanizing is mainly used for metal structure facilities of various industries, a steel piece after rust removal is immersed into zinc liquid melted at about 500 ℃, so that a zinc layer is attached to the surface of the steel piece, and the purpose of corrosion prevention is achieved; the temperature is too high, the fluidity of the zinc liquid is good, the zinc liquid is easy to separate from a workpiece, the iron loss of the workpiece and a zinc pot is serious, a large amount of zinc slag is generated, the quality of a zinc dipping layer is influenced, color difference is easy to cause, and the zinc consumption is high.

Through search, the Chinese patent with the application number of CN201910756313.2 discloses a silvery white hot galvanizing plating solution and a preparation method and application thereof, and the preparation method comprises the following steps: controlling the temperature of the color hot-dip galvanizing plating solution to be 520-560 ℃, adding an Al element and an Mg element into the plating solution, and uniformly mixing to obtain a silvery white hot-dip galvanizing plating solution; wherein, the addition amount of Al element is 0.01-0.03 percent of the mass of the color hot galvanizing plating solution, and the addition amount of Mg element is 0.02-0.035 percent of the mass of the color hot galvanizing plating solution. The silvery white hot galvanizing plating solution in the patent and the preparation method and the application thereof have the following defects: the hot galvanizing process has high energy consumption, and the zinc coating has the defects of poor thickness uniformity, corrosion resistance, surface hardness and the like.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a hot galvanizing production process with high automation degree.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hot galvanizing production process with high automation degree comprises the following steps:

s1: confirming supplied materials, including processing capacity confirmation, processing information confirmation and the condition of a piece to be plated;

s2: unloading, receiving incoming materials, placing in a standard way, and filing and storing;

s3: confirming a piece to be plated;

s4: the hanging part is used for hanging a part to be plated, the workpiece is hung at a certain angle, no adhesion and no air dead angle exist between the parts, a galvanized fabrication hole needs to be formed in a structural part, the number of the parts is maximized under the condition that the zinc consumption cost is acceptable in a single hanging process, the size of the hung workpiece needs to be less than or equal to 13.2m in length, the total width is less than or equal to 2.35m, the width of a single side is less than 1.18m, the width outside the hanging plate is 0.36m, the vertical height is less than or equal to 2.7m, the distance from the lower bottom surface of the hanging frame to the bottom of the workpiece is less than or equal to 3.7m, the highest point of the workpiece is not less than 0.9m away from;

s5: feeding, namely inputting the manually hung materials and processing information into a system, and entering automatic pretreatment processing after confirmation;

s6: dezincification, which is used for intensively removing a zinc layer attached to the hanger and the plating back piece, hydrochloric acid and zinc are subjected to chemical reaction, the zinc is dissolved and removed, the initial acidity is 10%, the process is controlled to be 2% -10%, and finally the acidity, the content of zinc chloride and the content of ferrous chloride are detected;

s7: washing with water;

s8: plating assistance, namely forming a salt film on the surface of a piece to be plated;

s9: hot galvanizing, wherein the zinc content in a zinc bath is not lower than 98.5%, heating by a natural gas high-speed pulse furnace, collecting zinc fume by adopting a mode of air suction at the top of a fixed cover, processing by a pulse type dust remover after collection, and concentrating and placing and managing dust at fixed points after processing; a zinc pot: length 13.3m, width 2.38m, and depth 3.3 m;

s10: cooling, namely cooling the galvanized part by two modes of natural cooling in air and water bath cooling;

s11: passivating, a chromate passivating agent and zinc form a passivation film layer, trivalent chromium is used as a framework, hexavalent chromium is used as filling, the content range of the hexavalent chromium is 1.0-1.5 g/L, the pH value is controlled to be 2-5, the temperature of a plated part is ensured to be not higher than 60 degrees before passivation, the passivation time is generally not less than 30s, and process parameters are adjusted according to products;

s12: discharging, namely discharging by manually operating a travelling crane after discharging by the automatic conveyor;

s13: and (4) post-processing, namely finishing the appearance quality of the plated part, performing exception processing, packaging and counting according to the quality requirement of the hot-dip galvanized product of the customer product.

Preferably: the incoming material confirmation mode in the S1 is manual visual inspection, and the processing capacity confirms the matching of the size, weight, material and processing mode of the piece to be plated and the equipment configuration of the galvanizing trolley; the processing information confirms the quantity, quality and processing requirement of incoming materials; the conditions of the workpiece to be plated are such as the structure, fabrication holes, surface corrosion, adhesion and straightness of the workpiece to be plated.

Preferably: the mode of confirming the workpiece to be plated in the S3 is manual visual inspection, and comprises the following aspects:

s21: the surface condition of the part to be plated is as follows: the surface of the piece to be plated is rusted, adhered and flattened;

s22: the surface is rusted seriously, whether the substrate of the plated part is damaged or not after rust removal is confirmed, and if the substrate is damaged, the processing is stopped;

s23: adhesive substance: the method comprises the following steps that foreign matters such as labels, glue, paint, grease and the like are attached to the surface of a plated part, so that the covered surface of the plated part to be plated cannot be effectively subjected to processes such as acid washing, assistant soaking and the like, the plating leakage of the zinc plating is caused, zinc ash is generated in a zinc pot, the cost is increased, the coated surface needs to be removed in time after inspection, if large-area paint and the like cannot be effectively removed, the coated surface is communicated with a client in time, and the client is advised to carry;

s24: and checking the structural condition of the piece to be plated, including the aspects of fabrication holes, welding and deformation.

Preferably: the water washing in the step S7 comprises the following steps:

s31: taking the pH value of rinsing water of 2-5 and the ferrous salt content of 10g/L as control standards;

s32: respectively carrying out deacidification and deironing treatment on the water by adding alkali to neutralize and precipitate;

s33: the washing water is treated by the waste water treatment integrated equipment, and the workpiece is soaked in the water tank and then is taken out by adopting one-step soaking type washing.

Preferably: the plating assisting step in the S8 comprises the following steps:

s41: the temperature is 50-80 ℃, zinc chloride and ammonium chloride are adopted for preparation, wherein the zinc chloride accounts for 90-120g/L, the ammonium chloride accounts for 150-200g/L, and the total concentration range of the zinc chloride and the ammonium chloride is between 250g/L and 350 g/L; controlling the ratio of ammonium to zinc to be 1: about 6; concentration of ferrous chloride: the concentration of the ferrous salt is not higher than 1 g/L; the PH value is 4-5;

s42: covering the mixed aqueous solution of ammonium chloride and zinc chloride on the surface of a workpiece at 50-70 ℃, cleaning the surface of steel and liquid zinc, removing iron salt, oxides and other dirt on the surface of the steel, reducing the surface tension of the steel, and enabling the surface of the steel to have an active effect and wetting capacity;

s43: the time for soaking the plating assistant agent is prolonged, so that the plating assistant is comprehensive, the temperature of a plated part is convenient to increase, the zinc soaking time is further reduced, and the time for soaking the assistant agent is determined according to the condition of the part to be plated in the production process and is not less than half a minute in principle.

Preferably: the operation mode of the hot galvanizing in the S9 comprises the following steps:

s51: confirming before plating to judge whether the galvanizing conditions are met;

s52: the galvanizing temperature is in the temperature range of 430-445 ℃, the working temperature is 435-440 ℃, and proper galvanizing temperature is selected for different plated pieces;

s53: the zinc dipping speed is determined according to the structure and the fastening and hanging mode for the light workpiece;

s54: after the workpiece is immersed in the zinc pot, the workpiece is lifted out when the boiling phenomenon is stopped;

s55: the zinc ash on the surface must be scraped off in time to obtain a bright coating;

s56: extracting a plated part: the lifting speed is 1-1.5m/min, the lifting angle is enlarged as much as possible, and the lifting speed can be adjusted through a main control system;

s57: after the plated part is taken out of the pot, zinc nodules and zinc spurs are timely removed.

Preferably: the cooling in the S10 is preferably low-hardness and low-chroma water, such as rainwater, river water and softened water, the temperature of the cooling water is 30-60 ℃, the liquid level of the cooling water is ensured to be kept constant, and the sudden increase and the sudden decrease are avoided.

Preferably: in the step S11, passivation is performed, and the plated part needs secondary paint spraying and plastic spraying treatment and does not need passivation; after cooling, the air-cooled part is passivated; for the plated part which is not easy to generate white rust, the plated part can be washed by water after being passivated; for the plated parts such as iron towers, high-speed guardrails and the like, white rust is easy to breed in the packaged parts, and water washing is not needed for passivation.

Preferably: the steps S6-S8 are integrated in the pretreatment closed room for automatic treatment, and the closed room adopts a micro negative pressure control technology.

Preferably: the steps S9-S12 are automated control operations.

The invention has the beneficial effects that: the invention has specific and detailed process flow for the re-plating parts with different treatment requirements, such as the re-plating parts needing to be subjected to zinc stripping, the re-plating parts without being subjected to zinc stripping, the parts to be plated with grease on the surface, the parts to be plated without grease and the re-plating parts of evaporative cold air cooling products, oil and foreign matters on the surface of the workpiece are cleaned, a rack and a zinc layer attached to the re-plating parts are intensively removed, acid liquor and iron salt adhered to the surface of the workpiece are purified, a salt film is formed on the surface of the part to be plated, the re-rusting before the plating is prevented, the part to be plated is subjected to hot galvanizing, a zinc-iron alloy layer or a pure zinc layer is formed through the complicated physical and chemical processes of infiltration of zinc liquid on the steel surface, iron dissolution, chemical reaction between iron atoms and zinc atoms, mutual diffusion and the like between the zinc liquid and steel, the material reaction which is easy to appear in color difference is avoided, the atmospheric corrosion resistance of the surface of the workpiece, the quality stability of the pickling production process is ensured, and the pickling production process is used for reducing the production amount of solid waste of the production line, reducing or delaying the occurrence time of white rust, keeping the coating to have good appearance, and has the advantages of low cost, durability, high efficiency and the like.

Drawings

FIG. 1 is a schematic view of a flow structure of an embodiment 1 of a highly automated hot dip galvanizing production process according to the present invention;

FIG. 2 is a schematic view of a flow structure of an embodiment 2 of a highly automated hot dip galvanizing production process according to the present invention;

FIG. 3 is a schematic view of a flow structure of an embodiment 3 of a highly automated hot dip galvanizing production process according to the present invention;

FIG. 4 is a schematic view of a flow structure of an embodiment 4 of a highly automated hot dip galvanizing production process according to the present invention;

fig. 5 is a schematic view of a flow structure of an embodiment 5 of a high-automation hot galvanizing production process provided by the invention.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1:

a high-automation hot galvanizing production process is shown in figure 1 and comprises the following steps:

s3: confirming a piece to be plated;

s4: the hanging part is used for hanging a part to be plated, the workpiece is hung at a certain angle, no adhesion and no air dead angle exist between the parts, a galvanized fabrication hole needs to be formed in a structural part, the quantity is maximized under the condition that the zinc consumption cost is acceptable in a single hanging process, the size of the hung workpiece needs to be less than or equal to 13.2m in length, the total width is less than or equal to 2.35m, the width of a single side is less than 1.18m, the width outside the hanging plate is 0.36m, the vertical height is less than or equal to 2.7m, the distance from the lower bottom surface of the hanging frame to the bottom of the workpiece is less than or equal to 3.7m, the highest point of the workpiece is not less than 0.9m away from the lower bottom surface of the hanging frame, pressure testing needs to be carried out before processing hollow special-shaped parts such as evaporative coolers and the like, no air leakage is ensured, acid liquid, zinc liquid and the;

s7: washing with water, wherein a large amount of ferric salt, acid liquor and other residual dirt are attached to the surface of a workpiece to be plated, and the acid liquor and the ferric salt adhered to the surface of the workpiece need to be purified for better plating assisting and zinc plating;

s8: plating assisting, wherein a salt film is formed on the surface of the piece to be plated to prevent rusting again before plating, and meanwhile, the salt film covered on the surface of the piece to be plated can increase the iron-zinc reaction activity in the hot galvanizing process;

s10: cooling, namely cooling the galvanized part by two modes of natural cooling in air and water bath cooling, wherein the galvanized part is cooled by water after being taken out of a pot generally, and the galvanized part is cooled by air in a suitable way for special products such as evaporative cooling and the galvanized part with a special structure, and the selection of water cooling or air cooling is determined by the actual condition of the galvanized part by natural cooling or fan cooling;

s12: discharging, namely discharging the workpiece after passivation treatment by manually operating a travelling crane after the automatic conveyor discharges, so as to facilitate the trimming and packaging after plating;

s13: and (4) post-processing, namely performing the operations of appearance quality finishing, exception handling, packaging, quantity counting and the like of the plated part of the customer product according to the quality requirement of the hot galvanizing product.

The incoming material confirmation mode in the S1 is manual visual inspection, and the processing capacity confirms the matching performance of the size, weight, material and processing mode of the piece to be plated and the equipment configuration of the galvanizing trolley; the processing information confirms the quantity, quality, processing requirements and the like of incoming materials; the conditions of the workpiece to be plated, such as the structure, the process hole, the surface corrosion, the adhesion, the straightness and the like of the workpiece to be plated are confirmed on the aspects of the incoming material condition, the processing capacity, the processing technology conformity and the like.

The mode of confirming the workpiece to be plated in the S3 is manual visual inspection, and comprises the following aspects:

s24: and checking the structural condition of the piece to be plated, including the aspects of process holes, welding, deformation and the like.

The water washing in the step S7 comprises the following steps:

The plating assisting step in the S8 comprises the following steps:

The operation mode of the hot galvanizing in the S9 comprises the following steps:

The cooling in the S10 is preferably low-hardness and low-chroma water, such as rainwater, river water and softened water, the temperature of the cooling water is 30-60 ℃, the liquid level of the cooling water is ensured to be kept constant, and the sudden increase and the sudden decrease are avoided.

In the step S11, passivation is performed, and the plated part needs secondary paint spraying and plastic spraying treatment and does not need passivation; after cooling, the air-cooled part is passivated; for the plated part which is not easy to generate white rust, the plated part can be washed by water after being passivated; for the galvanized parts such as iron towers, high-speed guardrails and the like, white rust is easy to breed in the packaging part, and the galvanized parts are passivated without being washed by water, so that the galvanized parts are prevented from generating white rust in the transportation and storage processes to influence the appearance quality.

The steps S6-S8 are integrated in the pretreatment closed room for automatic treatment, and the closed room adopts a micro negative pressure control technology.

The steps S9-S12 are automated control operations.

When the method is used, the zinc layer attached to the hanger and the re-plating piece needing to be subjected to zinc stripping is intensively removed by the method, acid liquor and iron salt adhered to the surface of the workpiece are purified, a salt film is formed on the surface of the workpiece to be plated, the workpiece to be plated is prevented from rusting again before plating, a zinc-iron alloy layer or a pure zinc layer is formed by hot galvanizing, and a material reaction which is easy to generate color difference is avoided through complex physical and chemical processes such as infiltration, iron dissolution, chemical reaction between iron atoms and zinc atoms and mutual diffusion of the zinc liquor generated between the zinc liquor and steel on the surface of steel, so that the atmospheric corrosion resistance of the surface of the workpiece is improved, the occurrence time of white rust is reduced or delayed, and the coating is kept to have good appearance.

Example 2:

a hot galvanizing production process with high automation degree, as shown in figure 2, for treating a back plating part without zinc stripping; the present embodiment is modified from embodiment 1 as follows: the method comprises the following steps:

s3: confirming a piece to be plated;

s6: washing, namely, using air floatation equipment to ensure that washing water is neutral or slightly alkaline, automatically washing in a soaking mode, and removing grease and foreign matters on the surface of a workpiece;

Example 3:

a high-automation hot galvanizing production process is shown in figure 3 and is used for treating a part to be plated with grease on the surface; the present embodiment is modified from embodiment 1 as follows: the method comprises the following steps:

s3: confirming a piece to be plated;

s6: degreasing, namely degreasing by using an alkaline degreasing agent or an acidic solution containing a surfactant, and treating the degreasing solution in a heating mode; the heat source utilizes the waste heat of cooling water to remove slight soluble oil, lubricating grease and other surface dirt;

s7: washing, namely, using air floatation equipment to ensure that washing water is neutral or slightly alkaline, automatically washing in a soaking mode, and removing grease and foreign matters on the surface of a workpiece;

s8: acid cleaning, in which hydrochloric acid and rust or iron oxide are subjected to chemical reaction to remove the rust or iron oxide by dissolution, and the size of an acid tank is 14.5m in length, 2.6m in width and 3.3m in depth;

s9: reducing, namely performing intensified acid washing on the workpiece by adopting hydrochloric acid solutions with medium and high concentrations and low ferrous salt contents, wherein the acidity is over 12 percent and the ferrous content is lower than 50g/L in the production process, so that the stable quality of the acid washing production process is ensured, and the method is used for reducing the generation amount of solid wastes in the production line;

s10: washing with water, wherein a large amount of ferric salt, acid liquor and other residual dirt are attached to the surface of a workpiece to be plated, and the acid liquor and the ferric salt adhered to the surface of the workpiece need to be purified for better plating assisting and zinc plating;

s11: plating assisting, wherein a salt film is formed on the surface of the piece to be plated to prevent rusting again before plating, and meanwhile, the salt film covered on the surface of the piece to be plated can increase the iron-zinc reaction activity in the hot galvanizing process;

s12: hot galvanizing, wherein the zinc content in a zinc bath is not lower than 98.5%, heating by a natural gas high-speed pulse furnace, collecting zinc fume by adopting a mode of air suction at the top of a fixed cover, processing by a pulse type dust remover after collection, and concentrating and placing and managing dust at fixed points after processing; a zinc pot: length 13.3m, width 2.38m, and depth 3.3 m;

s13: cooling, namely cooling the galvanized part by two modes of natural cooling in air and water bath cooling, wherein the galvanized part is cooled by water after being taken out of a pot generally, and the galvanized part is cooled by air in a suitable way for special products such as evaporative cooling and the galvanized part with a special structure, and the selection of water cooling or air cooling is determined by the actual condition of the galvanized part by natural cooling or fan cooling;

s14: passivating, a chromate passivating agent and zinc form a passivation film layer, trivalent chromium is used as a framework, hexavalent chromium is used as filling, the content range of the hexavalent chromium is 1.0-1.5 g/L, the pH value is controlled to be 2-5, the temperature of a plated part is ensured to be not higher than 60 degrees before passivation, the passivation time is generally not less than 30s, and process parameters are adjusted according to products;

s15: discharging, namely discharging the workpiece after passivation treatment by manually operating a travelling crane after the automatic conveyor discharges, so as to facilitate the trimming and packaging after plating;

s16: and (4) post-processing, namely performing the operations of appearance quality finishing, exception handling, packaging, quantity counting and the like of the plated part of the customer product according to the quality requirement of the hot galvanizing product.

The pickling in the step S8, wherein the preparation of the pickling solution comprises the following steps:

s61: cleaning soil and other dirt at the bottom of the acid tank without washing the acid tank with water;

s62: pumping water to each pickling tank through a new acid pump and a corresponding electric valve according to the water amount required by the ratio;

s63: adding a fog-inhibiting corrosion inhibitor into a water tank which is filled with water, wherein the proportion of the fog-inhibiting corrosion inhibitor is 0.6-1 percent of that of the pickling solution; preparing acidity: 14-16%, not more than 16%; preparing acidity in summer: 14% -15%; preparing acidity in winter: 15% -16%; the process control acidity is 4% -16%; FeCl2 is less than or equal to 250g/L and not more than 300g/L at most;

s64: and finally, supplementing 30% acid liquor to the acid pool to a required liquid level.

Example 4:

a hot galvanizing production process with high automation degree, as shown in figure 4, for treating a workpiece to be galvanized without grease; the present embodiment is modified from embodiment 1 as follows: the method comprises the following steps:

s3: confirming a piece to be plated;

s6: acid cleaning, in which hydrochloric acid and rust or iron oxide are subjected to chemical reaction to remove the rust or iron oxide by dissolution, and the size of an acid tank is 14.5m in length, 2.6m in width and 3.3m in depth;

s7: reducing, namely performing intensified acid washing on the workpiece by adopting hydrochloric acid solutions with medium and high concentrations and low ferrous salt contents, wherein the acidity is over 12 percent and the ferrous content is lower than 50g/L in the production process, so that the stable quality of the acid washing production process is ensured, and the method is used for reducing the generation amount of solid wastes in the production line;

s8: washing with water, wherein a large amount of ferric salt, acid liquor and other residual dirt are attached to the surface of a workpiece to be plated, and the acid liquor and the ferric salt adhered to the surface of the workpiece need to be purified for better plating assisting and zinc plating;

s9: plating assisting, wherein a salt film is formed on the surface of the piece to be plated to prevent rusting again before plating, and meanwhile, the salt film covered on the surface of the piece to be plated can increase the iron-zinc reaction activity in the hot galvanizing process;

s10: hot galvanizing, wherein the zinc content in a zinc bath is not lower than 98.5%, heating by a natural gas high-speed pulse furnace, collecting zinc fume by adopting a mode of air suction at the top of a fixed cover, processing by a pulse type dust remover after collection, and concentrating and placing and managing dust at fixed points after processing; a zinc pot: length 13.3m, width 2.38m, and depth 3.3 m;

s11: cooling, namely cooling the galvanized part by two modes of natural cooling in air and water bath cooling, wherein the galvanized part is cooled by water after being taken out of a pot generally, and the galvanized part is cooled by air in a suitable way for special products such as evaporative cooling and the galvanized part with a special structure, and the selection of water cooling or air cooling is determined by the actual condition of the galvanized part by natural cooling or fan cooling;

s12: passivating, a chromate passivating agent and zinc form a passivation film layer, trivalent chromium is used as a framework, hexavalent chromium is used as filling, the content range of the hexavalent chromium is 1.0-1.5 g/L, the pH value is controlled to be 2-5, the temperature of a plated part is ensured to be not higher than 60 degrees before passivation, the passivation time is generally not less than 30s, and process parameters are adjusted according to products;

s13: discharging, namely discharging the workpiece after passivation treatment by manually operating a travelling crane after the automatic conveyor discharges, so as to facilitate the trimming and packaging after plating;

s14: and (4) post-processing, namely performing the operations of appearance quality finishing, exception handling, packaging, quantity counting and the like of the plated part of the customer product according to the quality requirement of the hot galvanizing product.

Example 5:

a hot galvanizing production process with high automation degree, as shown in figure 5, is a plating return piece for treating an evaporative cooling air-cooling product; the present embodiment is modified from embodiment 1 as follows: the method comprises the following steps:

s3: confirming a piece to be plated;

s11: discharging, namely discharging the workpiece after passivation treatment by manually operating a travelling crane after the automatic conveyor discharges, so as to facilitate the trimming and packaging after plating;

s12: and (4) post-processing, namely performing the operations of appearance quality finishing, exception handling, packaging, quantity counting and the like of the plated part of the customer product according to the quality requirement of the hot galvanizing product.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A hot galvanizing production process with high automation degree is characterized by comprising the following steps:

s3: confirming a piece to be plated;

s7: washing with water;

2. The high-automation hot galvanizing production process according to claim 1, wherein the incoming material confirmation mode in the step S1 is manual visual inspection, and the processing capability confirms the matching of the size, weight, material, processing mode and the equipment configuration of the galvanizing car; the processing information confirms the quantity, quality and processing requirement of incoming materials; the conditions of the workpiece to be plated are such as the structure, fabrication holes, surface corrosion, adhesion and straightness of the workpiece to be plated.

3. The high-automation hot galvanizing production process according to claim 2, wherein the manner of the workpiece to be plated in the S3 is confirmed by manual visual inspection, and the method comprises the following steps:

4. The high-automation hot galvanizing production process according to claim 3, wherein the step of washing in S7 comprises the following steps:

5. The high-automation hot galvanizing production process according to claim 4, wherein the step of plating assisting in S8 comprises the following steps:

6. The high-automation hot galvanizing production process according to claim 1, wherein the hot galvanizing operation mode in the S9 comprises the following steps:

7. A highly automated hot dip galvanizing production process according to claim 6, characterized in that the cooling in S10 is preferably low hardness and low chroma water, such as rainwater, river water and softened water, and the cooling water temperature is 30-60 ℃, so as to ensure that the level of the cooling water is kept constant and avoid sudden high or low.

8. The high-automation hot dip galvanizing production process according to claim 7, wherein in the step S11, passivation is performed, and a plated part needs secondary painting and plastic spraying treatment without passivation; after cooling, the air-cooled part is passivated; for the plated part which is not easy to generate white rust, the plated part can be washed by water after being passivated; for the plated parts such as iron towers, high-speed guardrails and the like, white rust is easy to breed in the packaged parts, and water washing is not needed for passivation.

9. The automatic hot galvanizing production process according to claim 5, wherein the steps S6-S8 are integrated into a pre-treatment enclosure for automatic treatment, and a micro negative pressure control technology is adopted in the enclosure.

10. The automated hot dip galvanizing production process according to claim 8, wherein the steps S9-S12 are automated control operations.