KR20030030708A - An apparatus of removing bubbles generated in the storage tank for alkalic solution - Google Patents

Abstract

PURPOSE: An apparatus for removing bubbles in alkali solution storage tank is provided to effectively remove in the storage tank bubbles generated when storing a solution such as an alkali solution for removing rolling mill lubricant on a cold rolled strip into the storage tank. CONSTITUTION: In an alkali solution storage tank(3) in which an alkali solution(10) in an external case is agitated by an impeller(9) mounted on an agitation shaft(13) rotationally driven by a motor(15), the apparatus for removing bubbles in the alkali solution storage tank comprises a debubbling vane(21) for removing bubbles(30) formed on liquid surface of the alkali solution(10) as it is being rotated together with the agitation shaft(13); electric powered gear rows(33 to 36) installed between the motor(15) and debubbling vane(21) by a gear box(31) to transmit rotary power of the agitation shaft(13) to a driving shaft(22) of the debubbling vane(21); a vane case(41) divided into a plural debubbling casings so that the debubbling casings partially encircle the debubbling vane(21) with the vane case(41) being coaxially bolt locked to the driving shaft(22) on the bottom of the gear box(31); and a buoy(51) floated on the liquid surface of the alkali solution(10) with the buoy being integrally connected to the lower side of the vane case(41) so that the buoy is vertically moved along the gear box(31) guided by a guiding can(17) penetratingly installed on the upper surface of the external case.

Description

An apparatus of removing bubbles generated in the storage tank for alkalic solution}

The present invention relates to a device for removing bubbles generated from a solution in a storage tank, and more particularly, in the cold rolling equipment of a steel mill, a rolling oil applied on a strip for rust prevention is added to a subsequent process when producing a cold rolled product such as a strip. It relates to a defoaming device of an alkaline liquid storage tank for removing the bubbles generated from the alkaline liquid in the storage tank for storing the alkaline liquid used for degreasing before.

In general, according to the manufacturing process of the rolling strip of steel mills, the slab manufactured in the playing process is hot rolled to manufacture a thick plate, and then a strip of thin plate is manufactured by descaling the cold plate and performing cold rolling. In the manufacturing process, since the cold rolling of several passes is performed to have a predetermined thickness of the strip, by performing annealing after cold rolling, the stress applied to the strip due to the rolling is eliminated, and the next cold rolling is continued. Will improve the processability.

However, in the cold rolling process, since oil-containing contaminants, such as rolling oil or other foreign substances, adhere to the surface and are immediately put into an annealing process without removing them, an atmosphere by a harmful gas is formed around the strip due to thermal decomposition of the contaminants. Corrosion may occur or strength is reduced. Therefore, the cold rolled strip is to remove the contaminants attached to the surface through the degreasing equipment as shown in Figure 1 before being subjected to the annealing process.

That is, the degreasing apparatus shown in FIG. 1 removes contaminants mainly composed of iron compounds or oil-soluble organic substances attached to the strip 101 from the surface of the strip 101 by alkaline solution and brushing operation, and as shown in FIG. Degreasing tank 102 and the alkaline liquid storage tank 103 and the alkali liquid supply pipe connecting them. Therefore, when degreasing of the strip 101 starts, the alkaline liquid 100 is first pumped by the pump 104 from the storage tank 103 to the degreasing tank 102 through the supply pipe 106. The pumped alkaline liquid 100 is sprayed onto the surface of the strip 101 through the spray nozzle 105 to remove contaminants, and some or all of the alkaline liquid 100 used for degreasing is passed through the circulation pipe 107. Recovered to the storage tank 103 and reused.

However, the degreasing equipment as described above strips the alkaline liquid 100 mixed with the alkaline stock solution and the pure water of the alkaline stock solution 108 connected to the alkaline liquid storage tank 103 at a predetermined ratio through the spray nozzle 105. 101, the alkaline liquid 100 recovered into the storage tank 103 through the circulation pipe 107 has the bubbles 110 generated during the injection. In addition, since the alkaline liquid 100 is stirred by the stirring blade 109 in order to maintain the components even in the process of mixing the alkaline stock solution and the pure water to form the alkaline liquid 100, bubbles from the alkaline liquid 100 It is inevitable that 110 is generated.

Therefore, the phenomenon in which the foam 110 overflows from the alkali storage tank 103 occurs, which causes a problem that the work efficiency is significantly lowered, such as slowing the traveling speed of the strip 101.

Therefore, the present invention has been proposed to solve the problems of the conventional alkali storage tank, it is used to remove the contaminants of the strip, the foam in the alkaline liquid which is recovered to the alkaline storage tank or newly mixed stirring by the alkaline stock solution and pure water The purpose of the present invention is to maximize the space efficiency of the alkali storage tank and to further improve strip degreasing work by removing the by compression.

1 is a perspective view schematically showing a degreasing apparatus generally used in a cold rolling facility.

Figure 2 is a longitudinal sectional view of the alkaline liquid storage tank to which the bubble removing device according to the present invention is applied.

3 is a perspective view of FIG. 2

4 is a cross-sectional view of the wing case shown in FIG.

5 is a partially exploded perspective view of the wing case shown in FIG.

6 is a partial perspective view of the defoaming blade shown in FIG.

7 is a perspective view of the impeller shown in FIG. 2.

* Explanation of Signs of Major Parts of Drawings *

3: alkaline liquid storage tank 9: stirring blade

10: alkaline liquid 11: outer case

13: stirring shaft 15: drive motor

17: guide tube 20: number of levels

21: parcel wing 22: drive shaft

23: enlarged diameter portion 24: rotating plate

25: bubble removing needle 26: through hole

27: Impeller 30: Bubble

31: gearbox 33,34,35,36: electric gear train

41: wing case 43: parcel casing

45: base plate 51: knitting

53 level injection pipe 63: pinion gear

The present invention, in order to achieve the above object, in the alkaline liquid storage tank which is configured to agitate the alkali liquid in the outer case with a stirring blade mounted on the stirring shaft which is rotationally driven by a motor, the alkaline liquid while rotating together with the stirring shaft A defoaming blade for removing bubbles formed on the liquid surface of the motor, an electric gear train installed by the gearbox between the motor and the defoaming blade to transmit the rotational force of the stirring shaft to the drive shaft of the defoaming blade, and bolted coaxially with the drive shaft on the bottom of the gearbox. The wing case is divided into a plurality of parcel casings to partially surround the wing, and is integrally joined to the bottom of the wing case to move up and down along a gearbox guided by a guide tube installed through an upper surface of the outer case. Foaming agent in alkaline liquid storage tank consisting of floats floating on the surface It provides an apparatus.

Hereinafter, with reference to the accompanying drawings, the bubble removing device of the alkaline liquid storage tank according to an embodiment of the present invention will be described in detail as follows.

Defoaming device of the present invention is installed in a tank for storing a relatively high viscosity solution to remove the bubbles generated from the solution, as shown in Figure 1 in the alkaline liquid storage tank used in cold rolled strip rolling oil removal equipment as shown in FIG. Adopted to remove the bubbles generated in the alkaline liquid, the alkaline liquid storage tank used at this time to remove the rolling oil and the like as the conventional alkaline liquid storage tank as shown in Figure 2 and 3 in Figure 3 The supply pipe 6 for supplying the alkaline liquid 10 stored for use to a degreasing tank, the circulation pipe 7 for recovering the alkaline liquid 10 after use, and the stock solution injection tube 8 for supplying the alkaline stock solution are provided. It is connected to the outer case 11, respectively.

In addition to the conventional storage tank, the alkaline liquid storage tank 3 is also rotatably provided with a stirring blade 9 for stirring the recovered alkaline liquid and the newly added alkaline stock solution as shown in the middle of the stirring shaft 13. The stirring shaft 13 is rotationally driven by the drive motor 15 installed at the upper end of the case 11, and the spline 16 machined at the lower end and the boss shaft 18 coupled to the processing unit of the spline 16. The thrust bearing 19 rotatably supporting the boss shaft 18 is mounted on the axis of the outer case 11 in a state of vertical movement and rotation.

The defoamer according to the present invention, as shown in FIGS. 2 and 3, is mounted on the stirring shaft 13 installed in the storage tank 3 so that the up and down movement and rotation are possible. The defoaming blade 21, the drive gear train 33, 34, 35, 36 which transmits the driving force of a drive source to the defoaming blade 21, the wing case 41 surrounding the defoaming blade 21, and The upper defoaming wing and gear train and the case consists of a float 51 floating on the liquid surface of the alkaline solution (10), the support plate 45 as shown in Figure 5 may be additionally installed to increase the foam removal efficiency , Knit 51 may be added to the level water flow in and out devices 53, 55, 57 for up and down adjustment.

Here, the defoaming blade 21 means a wing for removing bubbles 30 generated in the alkaline liquid 10, the stirring blade 9 so as to be positioned on the liquid level of the alkaline liquid 10 stored in the storage tank 3. Is installed in the middle of the stirring shaft 13 is mounted, as shown in more detail in Figure 6 drive shaft 22, which rotates in conjunction with the stirring shaft 13, while rotating along the drive shaft 22 to foam It consists of the rotating plate 24 to remove, the bubble removing needle 25 which blows up the bubble which hits the rotating plate 24, and the impeller 27 which draws in the bubble between the rotating plate 24. As shown in FIG.

At this time, the driving shaft 22 that rotates together with the stirring shaft 13 by the rotation driving force of the stirring shaft 13, the drive motor 15 transmitted through the transmission gear train 33, 34, 35, 36 is shown in FIG. As shown in the hollow shaft shape is formed so as to surround the upper half of the stirring shaft 13, it is supported so as to rotate relative to the stirring shaft 13 by a bearing 29 mounted on the upper and lower ends, respectively, The relative rotational speed is determined by the gear ratio of 33, 34, 35, 36. The drive shaft 22 also has an enlarged diameter as the enlarged portion 23 so that the lower portion receives the impeller 27, and on the outer circumferential surface of the enlarged portion 23, as shown in FIGS. 26 is formed to penetrate so that the foam 30 on the liquid surface can be drawn into the defoaming casing 43 of the wing case 41 by the rotation of the impeller 27, and the bottom surface of the enlarged diameter portion 23 is shown in FIG. And as shown in Figure 6 a plurality of discharge holes 30 are formed to discharge the alkaline liquid introduced into the enlarged diameter portion 23, the rack of the same position and number as the rotating plate 24 in the bottom peripheral portion 28 protrudes downward.

The plurality of rotating plates 24 radially attached around the enlarged diameter portion 23 of the driving shaft 22 are surrounded by the wing case 41 as shown in FIGS. As shown in FIG. 6, a plurality of defoaming needles 25 protrude, wherein each of the rotating plates 24 is parallel to the axis on the outer circumferential surface of the enlarged diameter portion 23 as shown in FIGS. 3 and 6. Alternatively, it may be attached to the enlarged diameter portion 23 in a state inclined at an angle with respect to the axis, that is, slightly inclined in the rotation direction.

The impeller 27 mounted around the stirring shaft 13 to be located inside the enlarged diameter portion 23 is composed of a plurality of flatly curved wings gently curved as shown in more detail in FIG. 7. ) Into the parcel casing 43.

As shown in FIGS. 2 and 3, the electric gear train provided between the drive motor 15 and the defoaming blade 21 is surrounded by a gear box 31 which is a cylindrical body, and is generated by the motor 15. Stirring shaft 13 Engages with the drive gear 33 and the drive gear 33 attached to the top of the stirring shaft 13 so as to transmit the rotational driving force to the drive shaft 22, the first electric gear 34, the first transmission It consists of a second electric gear 35 mounted on the lower end of the rotary shaft 37 such as the gear 34 and a driven gear 36 meshed with the second electric gear 35 and attached to the upper edge portion of the drive shaft 22. However, by setting the gear ratio of each gear differently, the driving force reduction ratio by the motor 15 can be adjusted as needed. In addition, the gear box 31 is inserted into the guide cylinder 17 penetrated in the upper center of the outer case 11 to repeat the vertical movement, the guide cylinder 17 is a locking jaw 28 in the upper and lower corners of the inner circumferential surface This protrudes to limit the movement of the gearbox 31. At this time, the storage box 31 is guided up and down in a state in which the spline is processed on the outer circumferential surface and the relative rotation is suppressed with respect to the guide cylinder 17, and the driving motor 15 is installed through the support frame 38 attached to the upper surface. do.

As shown in FIGS. 2 to 4 and 5, the wing case 41 partially enclosing the defoaming blade 21 becomes a cylinder having two upper and lower stages as shown in the drawing, and the driving shaft 22 is moved by the upper shaft diameter portion. A driven gear 36 is attached to the upper end of the drive shaft 22 by the thrust bearing 48 on the upper flange portion 47 which is enclosed and penetrated to the bottom surface of the gearbox 31 by bolts 46. It is rotatably supported. The lower enlarged portion of the wing case 41 is cut out so that the outer circumferential surface is partially formed to individually form the same number of parcel casings 43 as the rotating plate 24, and the inlet portion of the parcel casing 43 is (44) On the opposite side edge portion, a foam guide vane 65 is opened, which extends in the rotational direction of the drive shaft 22.

In addition, the wing case 41 has a plurality of support plates 45 rotatably mounted on the lower edges of the inlet portion 44 of the plurality of parcel casings 43 formed at the lower portion through the bearing block 49. As shown in FIG. 5, a plurality of defoaming needles 25 protrude from the upper surface of the bearing block through bearing 61 fitted to both ends of the hinge shaft 50 and the hinge shaft 50 of one side. It is attached to 49 in a rotatable manner.

At this time, the pinion gear 63 engaged with the rack 28 of the wing case 41 is mounted at the inner end of the hinge shaft 50 so that the enlarged portion 23 of the driving shaft 22 is mounted. In accordance with the rotation of the support plate 45 is to be lifted upward, at this time the rotation angle of the support plate 45 can be set in accordance with the number of teeth of the rack 28 and the pinion gear (63) drive shaft (22) The support plate 45 can be rotated to an angle that is suitable for the inclination angle of the rotating plate 24, that is, the right angle. In addition, a torsion spring 64 is inserted into and attached to the inner end circumference portion of the hinge shaft 50 so as to return the support plate 45 lifted by the rack 28 to its original position.

Finally, the knitting 51 shown in Figs. 2 and 3 is a cylindrical structure for floating the parts of the above-described parts on the liquid level of the alkaline liquid stored in the storage tank 3, and the wing case 41 as shown. It is integrally bonded to the bottom of the) and has a container shape that can accommodate the level water 20 close to the air or the pure water therein. The entire bubble removing device can be moved up and down.

On the other hand, the knitting 51 can be configured to move up and down on the liquid surface even if the level of the alkaline liquid does not change, for this purpose, it is possible to adjust the amount of the number of levels 20 inside the knitting 51 as shown. The level water injection pipe 53, the drain port 55 and the drain port 55 opening and closing valve 57 may be additionally installed so as to move the float 51 above and below the liquid level. Considering the difference in specific gravity between the level water 20 and the alkaline liquid 10, the cross-sectional area and height of the knitting 51 are made sufficiently large, and the initial state of the knitting 51 is the surface of the level water 20 as shown in FIG. It is set to be above the liquid level of the alkaline liquid.

Here, the level water injection pipe 53 is connected to the upper edge portion of the knitting 51 as shown, extends upwardly so as to be exposed to the outside through the upper surface of the outer case 11 and level water from the external water supply source. To be supplied. Directly below the point where the level water injection pipe 53 is connected, a drain port 55 is formed through the drain port 51 for discharging the level water inside the knit 51. A valve 57 for opening and closing is provided at the drain port 55. The on-off valve 57 is a truncated cone-shaped stopper as shown in more detail in FIG. 3, and a packing 58 for sealing the level water 20 is wrapped on the outer circumferential surface thereof, A valve operating table 56 is attached and extends upward through the level water injection pipe 53 to be exposed to the outside.

Now, the action of the bubble removing device of the alkaline liquid storage tank according to the embodiment of the present invention configured as described above are as follows.

Once the bubble removing device of the present invention is installed in the alkaline liquid storage tank (3) is floated on the alkaline liquid 10 by the knitting 51 as shown in FIG. Therefore, the entire apparatus moves up and down inside the storage tank 3 according to the change in the amount of the alkaline liquid 10. At this time, by adjusting the amount of level inside the knitting 51, the device can be moved up and down the liquid level even when the amount of alkaline liquid does not change. That is, in the state of FIG. 2, the level water injection pipe 53 is removed from an external source. When the level water 20 is supplied into the knitting 51 through, the weight of the knitting 51 increases, so that the whole device including the knitting 51 naturally sinks below the liquid level, and on the contrary, in the state of FIG. Opening the opening and closing valve 57 through 56, the level number 20, which was filled in the knitting 51 is discharged to the storage tank 3 through the drain port 55, the entire device including the knitting 51 Since the weight of the device is naturally floated above the liquid level, such a vertical position change of the knitting 51 is stably guided up and down by the gear box 31 and the guide cylinder 17 of the top of the device.

As described above, in the bubble removing device floating on the liquid surface by the knitting 51, the stirring blade 9 and the impeller 27 rotate as the driving motor 15 operates, and at the same time the driving gear 33 of the electric gear train. By rotating the driven gear (36), the rotational force of the motor (15) is appropriately reduced according to the gear ratio of each gear (33, 34, 35, 36) constituting the electric gear train.

When the driving shaft 22 of the defoaming blade 21 rotates together with the driven gear 36 rotated by the rotational driving force of the driving motor 15 transmitted through the electric gear train, the enlarged diameter portion 23 of the driving shaft 22 is rotated. The rotating plate 24 attached thereto is also rotated in the wing case 41, and at the same time, the plurality of racks 28 protruding from the lower surface of the drive shaft 22 are also rotated. Accordingly, the support plate 45 lying on the bottom surface of the case 65 together with the hinge shaft 50 on which the pinion gear 63 is mounted while the pinion gear 63 intermittently engaged with the rack 28 is rotated. The inlet 44 of the casing 43 is rotated and lifted up.

Accordingly, the bubbles 30 attracted into the defoaming casing 43 by the impeller 27 rotating together with the stirring shaft 13 are compressed between the rotating plate 24 and the support plate 45, and the respective plates 24 and 45. Of the support plate 45 is released by the detonation needle 25 of the torsion spring 64 at the moment when the engagement between the rack 28 and the pinion gear 63 is released by the continuous rotation of the drive shaft 22. The restoring force returns to the original position parallel to the bottom surface of the wing case 41, and since the next rotating plate 24 does not cause interference with the supporting plate 45, the drive shaft 22 maintains rotation. At this time, the throughput of the bubbles removed while the rotating plate 24 and the supporting plate 45 are encountered can be appropriately adjusted by adjusting the rotational speed of the motor 15.

As described above, according to the defoaming apparatus of the alkaline liquid storage tank according to the present invention, even if the alkaline liquid used to remove various contaminants such as rolling oil applied to the surface of the cold rolled strip generates bubbles in the storage tank. Since it can be effectively removed, not only can the workability of the pollutant removal work by alkaline liquid be improved, but also the storage tank can be managed efficiently and the volume of the tank can be drastically reduced.

Claims (4)

In the alkaline liquid storage tank (3) configured to stir the alkali liquid (10) in the outer case (11) with the stirring blade (9) attached to the stirring shaft (13) which is rotationally driven by the motor (15). A defoaming blade 21 for removing bubbles 30 formed on the liquid surface of the alkaline liquid 10 while rotating together with the stirring shaft 13, and a driving force of the defoaming blade 21 for the rotational force of the agitating shaft 13. On the bottom surface of the gearbox 31, the gear trains 31, 34, 35, 36 installed by the gearbox 31 between the motor 15 and the defoaming blade 21 for transmission to the 22. It is bolted coaxially with the drive shaft 22 and penetrated to the wing case 41 divided into a plurality of parcel casings 43 so as to partially surround the parcel wing 21 and the upper surface of the outer case 11. It consists of a float 51 which is integrally bonded to the lower side of the wing case 41 to move up and down along the gearbox 31 guided by the guide cylinder 17 and floats on the liquid surface of the alkaline liquid 10. Bubble removing device of the alkaline liquid storage tank, characterized in that. According to claim 1, The defoaming blade 21 is installed to be relatively rotatable with respect to the stirring shaft 13 passing on the axis by the driving force of the motor 15 transmitted through the driven gear 36 of the electric gear train mounted on the upper end. One of the plurality of rotating plates 24 and the rotating plate 24 radially installed in the hollow drive shaft 22 and the enlarged diameter portion 23 at the lower end of the drive shaft 22 and surrounded by the wing case 41. A plurality of defoaming needles 25 protruding from the side, and foam 30 into the defoaming casing 43 mounted on the stirring shaft 13 in the enlarged diameter portion 23 and connected through the through hole 26 Bubble removing device of the alkaline liquid storage tank, characterized in that consisting of an impeller (27) for drawing a). The method of claim 2, The defoaming wing 21 has a rack 28 protruding one-to-one correspondence with the rotary plate 24 around the bottom surface of the enlarged diameter portion 23, and the wing case 41 has an inlet portion of each parcel casing 43. (44) A support plate 45 which is partially rotated by the rack 28 is installed at the lower edge, and the support plate 45 has a foam 30 together with the bubble removing needle 25 of the rotating plate 24. Defoamer device of the alkaline liquid storage tank, characterized in that a plurality of defoaming needle 25 to protrude. According to claim 1, The float 51 is connected to the level water injection pipe 53 which penetrates to the upper surface of the outer case 11 at the edge portion of the upper surface, and the drain hole 55 is formed on the bottom surface of the float 51 directly below. Is formed through, the drain port 55 of the alkaline liquid storage tank, characterized in that the opening and closing by the opening and closing valve 57 is connected to the valve operating table 56 extended to the outside along the injection pipe (53) Defoamer.