KR100544655B1 - Apparatus for controlling the input of chemicals to control the ph of nickel plating solution - Google Patents

Abstract

The present invention relates to an automatic chemical injection device for adjusting the pH of the nickel plating solution for precisely adjusting the nickel carbonate (NiCO ₃ ) to be adjusted to adjust the pH of the nickel plating solution to the pH target value (pH = 5.5). To this end, the present invention is the driving device 101 and the drive unit 100 consisting of a main shaft 307 connected to the drive and the mixing skirt 313 is rotatably fastened to the upper portion of the main shaft 307. And a stepped massing rotor 312, a chemical control supply unit 200 formed of scrapers 319 and 321 fixed to left and right inner surfaces of the massing chamber 316 for accommodating them, and an upper portion of the massing chamber 316. Chemical dosage amount automatic for adjusting the pH of the nickel plating solution, characterized in that consisting of the chemical mixing supply unit 300 consisting of a mixing bar 401 fixed to the upper end of the main shaft 307 in the storage hopper 106 is fixed Provide a regulator. As such, the present invention prevents the problem of lowering the plating efficiency due to the decrease in nickel plating adhesion caused by the effect of the pH of the nickel plating solution and the reduction of the electrodeposition of nickel. Improved matching has the effect of improving plating quality.

Nickel Plating, Cold Rolled Steel, pH, Massing Rotor, Scraper, Mixing Skirt

Description

FIELD OF CONTROLLING THE INPUT OF CHEMICALS TO CONTROL THE PH OF NICKEL PLATING SOLUTION}

1 is a schematic diagram schematically showing a conventional medicine injection device;

Figure 2 is a perspective view of the drug dosage automatic adjustment device for pH adjustment of the nickel plating solution according to the present invention;

Figure 3 is a cross-sectional view showing the configuration of the chemical injection amount automatic control device for adjusting the pH of the nickel plating solution according to the present invention;

Figure 4 is a detailed configuration of the chemical injection amount automatic control device for adjusting the pH of the nickel plating solution according to the present invention;

Figure 5 is an exploded perspective view of the drug dosage automatic control device for pH adjustment of the nickel plating solution according to the present invention;

Figure 6 is an operating state diagram of the chemical dosing automatic control device for pH adjustment of the nickel plating solution according to the present invention;

Figure 7 is a process flow chart of the chemical injection amount automatic control device for adjusting the pH of the nickel plating solution according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

301: drive case, 101: drive motor, 304: motor sprocket, 305: drive chain

306: shaft sprocket, 308a: upper ball bearing, 308b: lower ball bearing
307: main shaft, 100: drive unit, 307: main shaft, 313: mixing skirt

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312: mashing rotor, 316: mashing chamber, 319,321: scraper, 107: chute
200: chemical control unit, 106: storage hopper, 401: mixing bar

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300: chemical mixing supply unit

The present invention relates to a chemical injection amount automatic control device for adjusting the pH of the nickel plating solution, and more particularly, to adjust the pH of the nickel plating solution to uniformly plate the nickel in the length and width direction of the cold-rolled steel sheet It relates to a chemical dosage automatic control device for adjusting the pH of the nickel plating solution to accurately adjust the nickel carbonate (NiCO ₃ ) to the pH target value (pH = 5.5).

In particular, when the pH drops, nickel carbonate is automatically added to maintain a constant pH at all times to prevent nickel plating adhesion caused by the effect of pH and to prevent the plating efficiency from falling due to nickel electrodeposition. It is a chemical input amount automatic control device for adjusting pH of nickel plating solution for manufacturing plated steel sheet.

In general, in the production of cold rolled steel sheet, the strip is heated to a high temperature (780 to 850 ° C.) to perform annealing, and the strip is cooled with water (water cooling). During the water cooling operation, an oxide film is formed on the surface of the strip to make the color black. And dark blue.

Therefore, in order to remove the oxide film generated by the water cooling operation, the oxide film generated on the surface of the strip is pickled by hydrochloric acid or sulfuric acid solution in the post-treatment process installed at the exit of the annealing furnace to remove the surface oxide film. If the strip is pickled after continuous annealing, the phosphorus (P) or manganese (Mn), which have a good effect on the phosphate salts present on the surface of the strip, are removed by pickling, The problem of coarsening phosphate crystals arises.

Therefore, after pickling the strip, a small amount of nickel plating is applied to the surface of the strip for the purpose of improving the phosphate treatability and paintability of the strip.

Nickel flash plating on the surface of the steel sheet forms a thin nickel layer on the surface of the cold rolled steel sheet. In the subsequent phosphate treatment process, the nickel plating layer acts as a phosphate nucleation site (Site) to promote nucleation, resulting in fine phosphate crystals. The finer the phosphate crystal, the better the coating adhesion during the post-process coating.

In order to achieve the above effect, it is important to manage the pH of the nickel plating solution, and the management of the pH during nickel plating is usually maintained at 5.2.

When the pH is lower than 5.2, hydrogen, which is a relatively negative reactant, is generated, and the voltage decreases. Therefore, the hydrogen reduction reaction is increased rather than nickel plating, resulting in poor plating adhesion. When the pH is high, nickel hydroxide is formed on the surface of the strip. Interfering with electrodeposition causes a problem of low plating efficiency.

Therefore, since pH control plays an important factor in the surface quality control of the product, the pH management is to manage the pH by adding a certain amount of nickel carbonate into the tank of the reservoir tank. The factor of quality deterioration has led to the invention.

Looking at the known drug injection technology, the "agglomeration pharmaceutical input device" disclosed in the Republic of Korea Utility Model Publication No. 22567 in 1996 is a device for injecting agglomerated pharmaceutical products in the form of powder floating in the dissolution tank using compressed air, 1997 "Drug injection device equipped with floating valve" disclosed in Korean Utility Model Publication No. 10651 and "Measurement container type automatic chemical injection device" disclosed in Utility Model Application No. 21069 in 1997, but the pH (acidity) It is not possible to control the amount of nickel carbonate input.

That is, as shown in Figure 1, the conventional powder chemical input device to rotate the screw (2) by the driving force by the air motor (1) in order to inject the powdered chemicals 3 into the tank (4) As a device to take the medicine 3 takes a long time to be diluted in the tank 4, there is a problem that the precise control of the chemical input amount is impossible.

In order to solve the above problems, the present invention is a nickel carbonate (NiCO ₃ ) to be added to adjust the pH of the nickel plating solution to uniformly plate the nickel in the length and width direction of the cold rolled steel sheet pH target value (pH It is an object of the present invention to provide an automatic dose adjustment device for adjusting the pH of the nickel plating solution to precisely control the surface of the coating plate.

In order to achieve the above object, the present invention is a motor sprocket 304 and the shaft sprocket axially coupled with the drive motor 101 is fixed to the upper surface of the drive case 301, and the drive chain 305 An apparatus drive unit (100) comprising a main shaft (307) into which upper and lower ball bearings (308a, 308b) are inserted to axially rotate to 306; The mixing skirt 313 is rotatably fastened to the upper portion of the main shaft 307 constituting the device driving unit 100, and is coupled to the lower surface thereof to rotate, the outer diameter (D ₁ ) and the outer diameter ( D ₁₎ has an inner diameter (D ₂₎ smaller than the outer diameter (D ₁₎ and the inner diameter (D ₂₎ and the rotation drug supply is maesing rotor 312 of the step-like, which is determined by the mixing skirt 313 and a chemical control supply unit for supplying medicine to the medicine supply chute 107 installed at one side consisting of scrapers 319 and 321 fixed to the left and right inner surfaces of the massing chamber 316 accommodating the massing rotor 312 ( 200); And a storage hopper 106 fixed to an upper portion of the massing chamber 316 constituting the chemical control supply unit 200 and rotatably fixed to an upper end of the main shaft 307 of the device driving unit 100. It provides a chemical input amount automatic control device for adjusting the pH of the nickel plating solution, characterized in that consisting of the chemical mixing supply unit 300 consisting of a mixing bar 401.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view of the chemical dosage automatic adjustment device for adjusting the pH of the nickel plating solution according to the present invention, Figure 3 is a cross-sectional view showing the configuration of the automatic chemical dosage input device for adjusting the pH of the nickel plating solution according to the present invention 4 is a detailed configuration diagram of a chemical dosage automatic adjustment device for adjusting the pH of the nickel plating solution according to the present invention, Figure 5 is a decomposition of the automatic chemical dosage input device for adjusting the pH of the nickel plating solution according to the present invention Perspective view.

Apparatus driving unit 100 of the automatic chemical dosing device for adjusting the pH of the nickel plating solution according to the present invention is the main base 102 is bolted to the floor of the workplace and the drive case 301 and the main base 102 above The main body support 302 is bolted to the main base 102 and seated, and the drive motor 101 is seated on the motor base 103 to the drive case 301 to be bolted to fix the movement of the motor base 103. The moving bolt 303 is mounted to the driving case 301, and the shaft of the driving motor 101 is inserted into the driving bolt 303 so that the motor sprocket 304 is connected thereto.

The drive sprocket 305 is connected to the motor sprocket 304 so that the shaft sprocket 306 of the facility body is connected to transmit the rotational force, and the shaft sprocket 306 is fixed to the lower part of the main shaft 307 by bolts. An upper ball bearing 308a and a lower ball bearing 308b are inserted in the middle of the main shaft 307, and a sealing packing material 309 is mounted on upper and lower portions thereof.

The ball bearings 308a and 308b are mounted to the bearing case 310, and the lower cylindrical support 311 of the lower ball bearing 308b is installed to support the bearing case 310, and the ball bearings 308a and 308b are provided. The main shaft 307 is inserted into the center, and the lower protective cover 104 of the cylindrical main shaft 307 is seated on the upper surface of the main base 102 and bolted thereto.

The drug control supply unit 200 according to the present invention driven by the apparatus driving unit 100 configured as described above is seated by connecting the intermediate protective cover 105 to the upper portion of the lower protective cover 104, the main shaft A mashing rotor 312 is connected to the main shaft 307 with bolts, and a plate-shaped mixing skirt 313 is provided on the mashing rotor 312. It is connected to the upper surface of the bolt, it is configured to vary the number of revolutions by increasing the diameter of the cylinder to an appropriate size than the main shaft 307.

An upper cylindrical support 314 is connected to an upper portion of the upper ball bearing 308a to connect and weld a support plate 315 of a disk-shaped massing rotor 312 to the upper portion, and an upper mass support rotor to the upper cylindrical support 314. 312 is seated, bolted to the upper surface of the main shaft 307, and bolted to connect the massing chamber 316 to the upper surface of the intermediate protective cover 105, the upper portion of the massing chamber 316 The chemical storage hopper 106 is bolted to the surface and fixed.

The upper surface of the chemical control supply unit 200 is configured as described above, the chemical mixing supply unit 300 is configured, the central portion of the chemical storage hopper 106 constituting the hole is processed, the mixing shaft 317 in the hole ) Is inserted into the upper portion of the chemical storage hopper 106, the upper plate 318 is bolted to be seated, the central portion of the storage hopper 106 is a hole is processed so that the mixing shaft 317 can pass through, The cone-shaped cone 320 is mounted on the upper surface of the mixing shaft 317.

When the drug is discharged from the chemical storage hopper 106 of the chemical mixing supply unit 300 configured as described above, a scraper 319 fixed inside one side of the massing chamber 316 constituting the chemical control supply unit 200 is a massing rotor. By rotating the 312, the chemical is scraped off so that the chemical is in a certain amount of level in the massing chamber 316.

In addition, another scraper 321 is provided on one surface of the massing chamber 316, and the massing rotor 312 rotates to transport the chemicals transported to the chute 107.

The operation of the present invention configured as described above will be described in detail.

Figure 6 is an operating state diagram of the chemical dosing amount automatic adjustment device for adjusting the pH of the nickel plating solution according to the present invention, Figure 7 is a process flow diagram of the automatic chemical dosing amount adjustment device for adjusting the pH of the nickel plating solution according to the invention.

As shown in FIGS. 6 to 7, the pH is detected by the pH detector 601 and controlled through the medicine input device so that the pH is always maintained at a constant pH value.

In other words, the operation of the device structure of the chemical injection device according to the present invention will be described at the pH lower limit (5.0 or less) in the pH detector 601 installed in the plating liquid reservoir 603, by the pH control start signal The drive motor 101 of the drug injection device according to the present invention is operated and the power is transmitted to the motor sprocket 304 connected to the shaft is transmitted to the shaft sprocket 306 connected to the main body of the drug injection device by the drive chain 305. do.

The transmitted power rotates the main shaft 307, and the mixing bar 401 rotates and stores the medicine stored in the storage hopper 106 by simultaneously rotating the mixing shaft 317 connected to the main shaft 307. The medicine is supplied to the lower massing rotor 312 through a circular hole 402 installed below the hopper 106.

The supplied medicine is held in a fixed amount in the scraper 319 and the massing rotor 312 provided on the side of the mixing shaft 317 and the massing chamber 316.

The chemicals supplied to the massing rotor 312 by being adjusted to a predetermined level are supplied to the chute 107 by the rotation of the massing rotor 312, and the chemicals transferred to the chute 107 by the scraper 321. The medicine is supplied, the medicine (nickel carbonate) supplied to the chute 107 is put into the storage tank to control the pH to a certain value.

Looking at the determination of the massing rotor 312 and the chemical supply amount in more detail, in order to control the pH to a desired value it is necessary to constantly maintain the amount supplied to the massing rotor 312 diameter of the massing rotor 312 Determination of the supply amount of the chemical by the determination of the rotation of the drive motor 101 should be preceded.

That is, the present invention is a facility for forming a nickel plated layer on the strip by managing the pH from 5.0 to 5.5 due to the characteristics of the equipment, the determination of the diameter of the mashing rotor 312 is 0.5m chemical per rotation of the mashing rotor 312 (nickel carbonate) ³ was determined by the following calculation, and this decision process was determined by the following equation.

여기서, t=스크레퍼의 두께,
D₁=매싱 로터의 외측직경
D₂=매싱 로터의 내측직경
또한, 구동모터(101)의 결정은 모터의 감속비, 회전수, 모터측 스프라켓의 기어수 및 메인 샤프트측의 스프라켓의 기어수에 의해서 결정되며, 본 발명에 따라 결정된 구동모터(101) 및 스프라켓의 조건은 표 1과 같다.

Where t = scraper thickness,
D ₁ = outside diameter of mass rotor
D ₂ = inside diameter of mass rotor
In addition, the determination of the drive motor 101 is determined by the reduction ratio of the motor, the number of revolutions, the number of gears of the sprocket on the motor side and the number of gears of the sprocket on the main shaft side, and the determination of the drive motor 101 and the sprocket determined according to the present invention. The conditions are shown in Table 1.

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When the chemical supply amount is determined according to the conditions of the driving motor 101 and the sprocket as shown in Table 1, Equation 2 below.

Since the specification of the motor and the amount of supply are determined by the above calculation, the nickel carbonate is controlled by the following floor.

That is, the control of the nickel carbonate in the nickel reservoir receives the detection value of the pH detector 601 installed in the mixing tank to control the amount of nickel carbonate in accordance with the level of the nickel reservoir, and the nickel concentration of the nickel reservoir is the most. Since it is managed by appropriate 5.0-5.5, it is managed by 5.0 or less which is a pH lower limit.

When the pH detector 601 detects a pH lower limit value of 5.0 or less, the level in the reservoir 603 is detected by the level detector 602, and the nickel input amount is determined, and the nickel input amount is determined by the proportional integrator (instrument computer). tank level management of nickel mixing reservoir is managed by 13~20m ^3, and pH is the amount of nickel carbonate, based on the level of the water storage tank of the mixing point away from a lower limit of the dose is determined by the proportional integrator is nickel carbonate added, regardless of the level pH value is controlled.

As the amount of nickel carbonate is determined by the above calculation, the amount of nickel carbonate added per minute is 2.5 kg and the amount of nickel carbonate added per minute is 0.5 m ³ , and the amount of nickel carbonate injected per minute is rotated by the massing rotor 312. The feeding amount is controlled by motor control by a timer at 2.0 kg.

For example, in order to increase the pH value of 1 m ³ by 0.5, it is necessary to add 1 kg of nickel carbonate, and thus, when the driving motor 101 is rotated for 30 seconds, 1 kg of nickel carbonate is added to control the pH value.

In addition, the drive motor 101 rotates for 30 seconds, and after stopping, compares and detects the detected value detected by the pH detector 601 to perform control again.

This series of actions produces the best quality through optimal pH control.

As described above, the chemical input amount automatic control device for adjusting the pH of the nickel plating solution according to the present invention is automatically added to the nickel carbonate when the pH of the nickel plating solution drops to maintain a constant pH at all times by the effect of pH It prevents the problem of lowering the plating efficiency due to nickel plating adhesion degradation and nickel electrodeposition disturbance that is generated, thereby producing a nickel flash plated steel sheet having excellent surface quality, thereby improving plating quality by automating nickel carbonate input and improving consistency.

Claims (2)

The upper and lower parts of the drive case 301 are axially coupled to the motor sprocket 304 and the shaft sprocket 306 connected to the drive chain 305 and axially coupled to the drive motor 101 fixed downward. An apparatus driving unit (100) comprising a main shaft (307) into which ball bearings (308a, 308b) are inserted; The mixing skirt 313 is rotatably fastened to the upper portion of the main shaft 307 constituting the device driving unit 100, and is coupled to the lower surface thereof to rotate, the outer diameter (D ₁ ) and the outer diameter ( D ₁₎ has an inner diameter (D ₂₎ smaller than the outer diameter (D ₁₎ and the inner diameter (D ₂₎ and the rotation drug supply is maesing rotor 312 of the step-like, which is determined by the mixing skirt 313 and a chemical control supply unit for supplying medicine to the medicine supply chute 107 installed at one side consisting of scrapers 319 and 321 fixed to the left and right inner surfaces of the massing chamber 316 accommodating the massing rotor 312 ( 200); A mixing hopper rotatably fixed to an upper end of the main hopper 307 of the device driving unit 100 and a storage hopper 106 fixed to an upper portion of the massing chamber 316 constituting the chemical control supply unit 200. Chemical input amount automatic adjustment device for adjusting the pH of the nickel plating solution, characterized in that consisting of the drug mixture supply unit 300 consisting of a bar (401). The method of claim 1, The drug mixture supply unit 300 includes a solid cone 320 for dispersing the drug supplied to the left and right fixed to the center portion of the mixing bar 401 is rotatably fixed to the upper end of the main shaft 307 Chemical dosage automatic control device for pH adjustment of the nickel plating solution, characterized in that the configuration.

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