Alkali washing and degreasing device for hot-rolled ribbed steel bars

Abstract

The utility model provides an alkali washing and degreasing device for hot-rolled ribbed steel bars. The alkali washing and degreasing device comprises an alkali washing unit and a water washing unit which are arranged in sequence, the alkali washing unit comprises an alkali liquor spray washer, an alkali scrubbing mechanism and an alkali liquor header pipe, the alkali liquor spray washer is arranged on the upstream of the alkali scrubbing mechanism, a liquor inlet in the top of the alkali liquor spray washer is communicated with the alkali liquor header pipe through an alkali liquor branch pipe, and an alkali liquor spraying pipe communicated with the alkali liquor header pipe is arranged above the alkali scrubbing mechanism; the water washing unit comprises a water scrubbing mechanism, a circulating water spray washer and a primary water spray washer which are arranged in sequence, a liquid inlet in the top of the circulating water spray washer is communicated with a circulating water main pipe, a liquid inlet in the top of the primary water spray washer is communicated with a primary water pipe, and a circulating water spraying pipe communicated with the circulating water main pipe is further arranged above the water scrubbing mechanism. According to the steel bar surface cleaning device, oil films and impurities on the surface of a steel bar are thoroughly removed in a mode of combining chemical decomposition and mechanical scrubbing, and a foundation is provided for subsequent galvanization.

Description

Technical Field

[0001] The utility model relates to the technical field of ribbed steel bars, in particular to an alkali washing and degreasing device for hot-rolled ribbed steel bars. Background Art

[0002] Hot-rolled ribbed steel bars, commonly known as threaded steel bars, have high strength, high toughness, and good seismic resistance. They are ideal products for high-rise buildings and are widely used in the field of building concrete. In order to increase the corrosion resistance of steel bars and improve the strength and life of reinforced concrete, hot-dip galvanizing is usually performed on the outside of hot-rolled ribbed steel bars. After hot-dip galvanizing, the surface of the steel bar is covered with a pure zinc layer in the form of complete physical protection. A Zn-Fe alloy layer is also formed between the pure zinc layer and the steel bar matrix, which isolates the steel bar matrix from the atmosphere, thereby protecting the steel bar matrix from corrosion.

[0003] The temperature of the ribbed steel bars after hot rolling is as high as about 890℃, and they are cooled to room temperature on the cooling bed. During the rolling process, the lubricating oil on the surface of the roller adheres to the surface of the steel bar, and some grease is often enriched in the cooling water, so that an oil film is formed on the outer surface of the ribbed steel bar. The existence of this oil film will seriously affect the subsequent zinc liquid plating and the firmness of the zinc coating, so it needs to be cleaned and removed. However, after the slitting and rolling, multiple ribbed steel bars are transported forward side by side, and the longitudinal ribs and transverse ribs on the surface of the ribbed steel bars are staggered, which easily leads to the appearance of cleaning dead corners, thus affecting the performance of the galvanized ribbed steel bars. Utility Model Content

[0004] In order to overcome the disadvantages of the prior art, the utility model provides an alkali washing and degreasing device for hot-rolled ribbed steel bars, so as to fully remove the oil film on the outer surface of the ribbed steel bars.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An alkali washing and degreasing device for hot-rolled ribbed steel bars comprises an alkali washing unit and a water washing unit arranged in sequence; the alkali washing unit comprises an alkali liquid sprayer, an alkali scrubbing mechanism and an alkali liquid main pipe, the alkali liquid sprayer is arranged upstream of the alkali scrubbing mechanism, a liquid inlet at the top of the alkali liquid sprayer is connected to the alkali liquid main pipe through an alkali liquid branch pipe, and an alkali liquid spray pipe connected to the alkali liquid main pipe is arranged above the alkali scrubbing mechanism;

[0007] The water washing unit includes a water scrubbing mechanism, a circulating water sprayer, and a primary water sprayer which are arranged in sequence. The top liquid inlet of the circulating water sprayer is connected to the circulating water main pipe, and the top liquid inlet of the primary water sprayer is connected to the primary water pipe. A circulating water spray pipe which is connected to the circulating water main pipe is also arranged above the water scrubbing mechanism.

[0008] A further improvement of the utility model is that the alkali washing unit includes a first alkali liquid sprayer, a first alkali brushing mechanism, a second alkali liquid sprayer, and a second alkali brushing mechanism arranged in sequence; the water washing unit includes a first water brushing mechanism, a first circulating water sprayer, a second water brushing mechanism, a second circulating water sprayer, and a primary water sprayer arranged in sequence.

[0009] A further improvement of the utility model is that an air knife blowing mechanism is also provided between the alkali washing unit and the water washing unit.

[0010] A further improvement of the utility model is that: the alkali brushing mechanism includes a group of alkali washing brushes symmetrically clamped on the upper and lower sides of the ribbed steel bars, and an alkali washing motor for driving the alkali washing brushes to rotate; the water brushing mechanism includes a group of water washing brushes symmetrically clamped on the upper and lower sides of the ribbed steel bars, and a water washing motor for driving the water washing brushes to rotate; the rotation directions of the alkali washing brushes and the water washing brushes are opposite to the running direction of the ribbed steel bars.

[0011] A further improvement of the utility model is that the alkali-washing brush and the water-washing brush are both steel wire brushes.

[0012] A further improvement of the utility model is that the alkali washing unit also includes an alkali solution recovery tank for receiving the sprayed alkali solution, and the alkali solution recovery tank is connected to the circulating alkali solution storage tank; the water washing unit also includes a circulating water recovery tank for receiving circulating water and primary water, and the circulating water recovery tank is connected to the circulating water storage tank.

[0013] A further improvement of the utility model is that a serpentine heat exchange tube is provided in the circulating alkali solution storage tank, the inlet end of the serpentine heat exchange tube is connected to the waste heat steam from the heating furnace, and the outlet end of the serpentine heat exchange tube is connected to the condensed water tank.

[0014] A further improvement of the utility model is that the exteriors of the alkali solution branch pipe and the alkali solution spray pipe are both covered with electric heating sleeves.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides an alkali washing and degreasing device for hot-rolled ribbed steel bars. Aiming at the difficulty of degreasing caused by the parallel operation of multiple ribbed steel bars and the staggered horizontal and vertical ribs on the surface of the ribbed steel bars, the oil film on the surface of the steel bars is completely removed by combining chemical decomposition and mechanical brushing, and the impurities on the surface of the steel bars are also removed, providing a basis for subsequent galvanizing, with fast degreasing speed and high efficiency. After alkali washing, the utility model uses circulating water to rinse the surface of the steel bars for multiple times, and finally rinses it with water once, ensuring that the surface of the ribbed steel bars entering the galvanizing stage is neutral. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] In the figure: 1-1, the first alkali solution sprayer, 1-2, the first alkali brushing mechanism, 1-3, the second alkali solution sprayer, 1-4, the second alkali brushing mechanism, 1-5, the alkali solution main pipe, 1-6, the alkali solution branch pipe, 1-7, the alkali solution spray pipe, 1-8, the alkali solution recovery tank, 1-9, the circulating alkali solution storage tank, 1-10, the serpentine heat exchange tube, 2-1, the first water brushing mechanism, 2-2, the first circulating water sprayer, 2-3, the second water brushing mechanism, 2-4, the second circulating water sprayer, 2-5, the primary water sprayer, 2-6, the circulating water main pipe, 2-7, the circulating water branch pipe, 2-8, the circulating water spray pipe, 2-9, the primary water pipe, 2-10, the circulating water recovery tank, 2-11, the circulating water storage tank, 3, the wind knife blowing mechanism, 4, the ribbed steel bar. DETAILED DESCRIPTION

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] An alkali washing and degreasing device for hot-rolled ribbed steel bars comprises an alkali washing unit and a water washing unit arranged in sequence. The alkali washing unit is used to remove the oil film on the outer surface of the ribbed steel bars 4, and then the water washing unit is used to rinse the alkali solution on the surface of the ribbed steel bars 4.

[0021] like Figure 1 As shown, the alkali washing unit includes an alkali liquid sprayer, an alkali scrubbing mechanism, an alkali liquid main pipe 1-5, an alkali liquid recovery tank 1-8 and a circulating alkali liquid storage tank 1-9. The alkali liquid sprayer is a rectangular box-type structure, and a ribbed steel bar 4 conveying channel is provided inside the alkali liquid sprayer; a liquid inlet is provided at the top of the alkali liquid sprayer, and the liquid inlet is connected to the alkali liquid main pipe 1-5 through an alkali liquid branch pipe 1-6, and the alkali liquid sprays downward through the liquid inlet. The alkali scrubbing mechanism includes a group of alkali washing brushes symmetrically clamped on the upper and lower sides of the ribbed steel bar 4, and an alkali washing motor for driving the alkali washing brushes to rotate; the rotation direction of the output power of the alkali washing motor is opposite to the running direction of the ribbed steel bar 4, and an alkali liquid spray pipe 1-7 connected to the alkali liquid main pipe 1-5 is also provided above the alkali washing brush. When the ribbed steel bar 4 passes through the alkali washing brush, the brush quickly scrubs the steel bar surface in the presence of alkali liquid, and the oil film on the steel bar surface is quickly removed through mechanical and chemical actions.

[0022] A lye recovery tank 1-8 for receiving the sprayed lye is also provided below the lye sprayer and the lye scrubbing mechanism, and the lye recovery tank 1-8 is connected to a circulating lye storage tank 1-9. The outlet of the circulating lye storage tank 1-9 is connected to the lye main pipe 1-5 through an lye circulation pump to achieve the recycling of the lye.

[0023] In order to improve the degreasing effect of alkali solution, a serpentine heat exchange tube 1-10 is arranged in the circulating alkali solution storage tank 1-9, the inlet end of the serpentine heat exchange tube 1-10 is connected to the waste heat steam from the heating furnace, and the outlet end of the serpentine heat exchange tube 1-10 is connected to the condensate tank; in the vehicle production stage, the waste heat steam is used to heat the alkali solution in the storage tank to provide high-temperature alkali solution for the alkali washing unit. At the same time, the exterior of the alkali solution branch pipe 1-6 and the alkali solution spray pipe 1-7 are coated with electric heating sleeves to ensure that the alkali solution in contact with the ribbed steel bar 4 maintains a high temperature. Generally speaking, the temperature of the alkali solution sprayed from the alkali solution branch pipe 1-6 and the alkali solution spray pipe 1-7 is controlled at 40℃~70℃, and the degreasing effect is best.

[0024] The number of the alkali solution sprayers and alkali scrubbing mechanisms can be adjusted according to actual requirements, such as Figure 1 As shown, in the utility model, the alkali washing unit includes a first alkali liquid sprayer 1-1, a first alkali brushing mechanism 1-2, a second alkali liquid sprayer 1-3, and a second alkali brushing mechanism 1-4 which are arranged in sequence; by alternating rinsing and brushing, the oil film on the surface of the steel bar can be fully removed, and other debris attached to the surface of the steel bar can also be removed.

[0025] Based on the consideration of oil removal effect and cost, the alkali solution usually used for oil removal is sodium hydroxide solution, and the concentration of sodium hydroxide solution is 2%~5% to ensure the oil decomposition effect. In actual operation, the pH of the circulating alkali solution needs to be monitored regularly, and solid sodium hydroxide (commonly known as flake alkali) is added to the circulating alkali solution storage tank. Since the dissolution process of sodium hydroxide is an exothermic reaction, when adding solid sodium hydroxide, the input of waste heat steam should be stopped, and small amounts of material should be added multiple times to dissolve.

[0026] The water washing unit comprises a water scrubbing mechanism, a circulating water sprayer, a primary water sprayer 2-5, a circulating water main pipe 2-6, a primary water pipe 2-9, a circulating water recovery tank 2-10 and a circulating water storage tank 2-11. The water scrubbing mechanism, the circulating water sprayer and the primary water sprayer 2-5 are arranged in sequence, and the alkali solution on the surface of the steel bar is first scrubbed by the water scrubbing mechanism, then sprayed with circulating water, and finally rinsed with primary water.

[0027] The water washing mechanism includes a group of water washing brushes symmetrically clamped on the upper and lower sides of the ribbed steel bar 4, and a water washing motor for driving the water washing brushes to rotate; the rotation direction of the water washing brushes is opposite to the running direction of the ribbed steel bar 4, and a circulating water spray pipe 2-8 connected to the circulating water main pipe 2-6 is also arranged above the water washing brush. When the ribbed steel bar 4 passes through the water washing brush, the brush quickly brushes the surface of the steel bar in the presence of circulating water.

[0028] Similar to the structure of the alkali solution sprayer, the circulating water sprayer and the primary water sprayer 2-5 are both rectangular box-type structures, and a transversely penetrating ribbed steel bar 4 conveying channel is provided inside. The liquid inlet at the top of the circulating water sprayer is connected to the circulating water main pipe 2-6 through the circulating water branch pipe 2-7, and the liquid inlet at the top of the primary water sprayer 2-5 is connected to the primary water pipe 2-9.

[0029] The number of the water scrubbing mechanism and circulating water sprayer can be adjusted according to actual requirements, such as Figure 1 As shown, in the utility model, the alkaline washing unit includes a first water scrubbing mechanism 2-1, a first circulating water sprayer 2-2, a second water scrubbing mechanism 2-3, a second circulating water sprayer 2-4 and a primary water sprayer 2-5 which are arranged in sequence, and is fully cleaned by alternating rinsing and scrubbing.

[0030] A circulating water recovery tank 2-10 for receiving circulating spray water is also provided below the water scrubbing mechanism, the circulating water sprayer and the primary water sprayer 2-5. The circulating water recovery tank 2-10 is connected to the circulating water storage tank 2-11. The outlet of the circulating water storage tank 2-11 is connected to the circulating water main pipe 2-6 through a circulating water pump for recycling.

[0031] The alkali-washing brush and the water-washing brush are both steel wire brushes, which have sufficient strength and high-temperature resistance and can effectively clean the surface of high-temperature steel bars.

[0032] The alkali solution spray pipes 1-7 and the circulating water spray pipes 2-8 are all inclined pipes facing the incoming direction of the ribbed steel bars 4, ensuring that the alkali solution and the circulating water can fully contact the brushes.

[0033] In order to ensure the cleaning effect of the water washing unit, an air knife blowing mechanism 3 is further provided between the alkali washing unit and the water washing unit. The air knife blowing mechanism 3 is also a rectangular box-type structure, and a row of air knives are symmetrically provided at the top and bottom of the air knife blowing mechanism 3. The blowing direction of the air knife is opposite to the running direction of the ribbed steel bar 4. The alkali solution on the surface of the ribbed steel bar 4 is blown away as much as possible by the opposite blowing of the air knife, ensuring the cleaning of the subsequent water washing unit.

[0034] One side of the inlet end of the wind knife blowing mechanism 3 is located above the alkali solution recovery tank 1-8, and the alkali solution on the surface of the steel bar is blown into the alkali solution recovery tank 1-8 by high-pressure wind.

[0035] Since the ribbed steel bars 4 after the hot rolling are cut are arranged side by side in multiple pieces and conveyed forward synchronously, in order to restrain the ribbed steel bars 4 laterally and make them smooth so that they can be conveyed smoothly and continuously and avoid steel pile-up, the inlet ends of the alkali liquid sprayer, the air knife blowing mechanism 3, the circulating water sprayer and the primary water sprayer 2-5 are all connected to the trumpet mouth with a large front and a small rear, which is used to restrain the multiple ribbed steel bars 4 laterally and convey them continuously into the box.

[0036] The working process of the utility model is:

[0037] The high-temperature ribbed steel bars are placed side by side in the first alkali cleaning sprayer, where they are sprayed with hot alkali solution. Then, the surface of the steel bars is quickly scrubbed with an alkali brush while the hot alkali solution is continuously sprayed. The oil film on the surface of the steel bars is removed by the combined action of chemical decomposition and mechanical scrubbing. Then, they enter the second alkali cleaning sprayer and the second alkali scrubbing mechanism for secondary decomposition and scrubbing to ensure that the oil stains are completely cleaned. Then, the ribbed steel bars enter the air knife blowing mechanism to blow away the alkali solution adhering to the outer wall, and enter the water washing unit.

[0038] In the water washing unit, the steel bar surface is first mechanically brushed and then rinsed with circulating water to wash away the impurities washed out; after the secondary circulating water rinse, it is finally rinsed with water once more.

[0039] After being collected, the alkali solution and circulating water enter the circulating alkali solution storage tank and circulating water storage tank for storage respectively. After the impurities are settled, the supernatant is output by the alkali solution circulation pump / circulating water pump and reused for spraying.

[0040] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An alkali washing and degreasing device for hot-rolled ribbed steel bars, characterized in that: The invention comprises an alkali washing unit and a water washing unit which are arranged in sequence; the alkali washing unit comprises an alkali liquid sprayer, an alkali scrubbing mechanism and an alkali liquid main pipe (1-5); the alkali liquid sprayer is arranged upstream of the alkali scrubbing mechanism; the liquid inlet at the top of the alkali liquid sprayer is connected to the alkali liquid main pipe (1-5) through an alkali liquid branch pipe (1-6); an alkali liquid spray pipe (1-7) connected to the alkali liquid main pipe (1-5) is arranged above the alkali scrubbing mechanism; the water washing unit comprises a water scrubbing mechanism, a circulating water sprayer and a primary water sprayer (2-5) which are arranged in sequence; the liquid inlet at the top of the circulating water sprayer is connected to the circulating water main pipe (2-6); the liquid inlet at the top of the primary water sprayer (2-5) is connected to the primary water pipe (2-9); and a circulating water spray pipe (2-8) connected to the circulating water main pipe (2-6) is also arranged above the water scrubbing mechanism.

2. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 1, characterized in that: The alkali washing unit comprises a first alkali liquid sprayer (1-1), a first alkali scrubbing mechanism (1-2), a second alkali liquid sprayer (1-3), and a second alkali scrubbing mechanism (1-4) which are arranged in sequence; and the water washing unit comprises a first water scrubbing mechanism (2-1), a first circulating water sprayer (2-2), a second water scrubbing mechanism (2-3), a second circulating water sprayer (2-4), and a primary water sprayer (2-5) which are arranged in sequence.

3. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 1, characterized in that: An air knife blowing mechanism (3) is also provided between the alkali washing unit and the water washing unit.

4. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 1, characterized in that: The alkali brushing mechanism comprises a group of alkali brushes symmetrically clamped on the upper and lower sides of the ribbed steel bar (4), and an alkali washing motor for driving the alkali brushes to rotate; the water brushing mechanism comprises a group of water washing brushes symmetrically clamped on the upper and lower sides of the ribbed steel bar (4), and a water washing motor for driving the water washing brushes to rotate; the rotation direction of the alkali brushes and the water washing brushes is opposite to the running direction of the ribbed steel bar (4).

5. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 4, characterized in that: The alkali-washing brush and the water-washing brush are both steel wire brushes.

6. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 1, characterized in that: The alkali washing unit further comprises an alkali solution recovery tank (1-8) for receiving sprayed alkali solution, and the alkali solution recovery tank (1-8) is connected to the circulating alkali solution storage tank (1-9); the water washing unit further comprises a circulating water recovery tank (2-10) for receiving circulating water and primary water, and the circulating water recovery tank (2-10) is connected to the circulating water storage tank (2-11).

7. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 6, characterized in that: The circulating alkali liquid storage tank (1-9) is provided with a serpentine heat exchange tube (1-10), the inlet end of the serpentine heat exchange tube (1-10) is connected to the waste heat steam from the heating furnace, and the outlet end of the serpentine heat exchange tube (1-10) is connected to the condensed water tank.

8. The alkali washing and degreasing device for hot-rolled ribbed steel bars according to claim 1, characterized in that: The exteriors of the alkali solution branch pipe (1-6) and the alkali solution spray pipe (1-7) are both covered with electric heating jackets.

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