KR100807671B1 - apparatus for automatically discharging fume and bubble forming from an alkali solution storage tank - Google Patents

Abstract

The present invention relates to a gas and foam automatic discharge device in an alkaline liquid storage tank for effectively and automatically discharging gases and bubbles generated in an alkaline liquid storage tank used for removing various contaminants adhering to the surface of a cold-rolled strip.

The automatic gas and foam automatic discharge device in the alkaline liquid storage tank of the present invention includes a rotational aberration 31 provided inside the drain pipe 17 for recovering the alkaline solution used from the degreasing and washing machine 3, An eccentric cam 35 mounted on the rotary shaft 33 of the rotational aberration 31 provided in the outer case 2 of the outer case 2 and a gas duct 23 for discharging gas generated in the alkaline liquid storage tank 1, A pumping cylinder 39 connected to the outer circumferential surface of a gas pipe 37 connected to the pumping cylinder 39 and a pumping spring 39 for pumping the pumping cylinder 39 in the pumping cylinder 39, And a hollow piston rod (41) for discharging gas and foam in the gas pipe (1) to the outside through the gas pipe (37).

Therefore, according to the present invention, it is possible to stably discharge the gas and bubbles generated in the alkaline liquid storage tank by a predetermined amount, thereby wasting alkaline liquid or heat source and preventing contamination of the working environment .

Cold rolling, strip, rolling oil, alkaline liquid, storage tank, foam, gas, electrolytic clean, discharge

Description

[0001] The present invention relates to an apparatus for automatically discharging gases and bubbles in an alkaline liquid storage tank,

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional electrolytic clean line used in a steel cold rolling mill facility or the like. Fig.

2 is a schematic view of an electrolytic clean line showing a state where an automatic gas and foam automatic discharge device according to the present invention is installed in an alkaline liquid storage tank;

3 is a cross-sectional view of the rotational aberration shown in Fig.

FIG. 4 is a partially cutaway perspective view showing the pumping cylinder and the piston rod shown in FIG. 2 in detail; FIG.

Fig. 5 is a longitudinal sectional view of Fig. 4; Fig.

            Description of the Related Art [0002]

1: alkaline liquid storage tank 2: outer case

3: degreasing washing machine 5: circulation pump

17: drain pipe 19: filter

21: Foam 23: Gas duct

31: rotational aberration 33: rotational axis

35: eccentric cam 37: gas piping                 

39: Pumping cylinder 41: Piston rod

43: gas inlet port 45: gas outlet port

47: adjusting screw 51: pumping part

53, 54, 57: upper, lower, auxiliary piston 55:

59: pumping chamber 61, 63: intake and exhaust pipe

65: Check valve 74: Gas suction pipe

75: push rod

The present invention relates to an apparatus for automatically discharging gas and bubbles in an alkaline liquid storage tank, and more particularly, to an apparatus and method for automatically discharging alkaline and alkaline water in an electrolytic clean line for removing foreign substances such as rolling oil, To an apparatus for automatically discharging gas and foam in an alkaline liquid storage tank capable of effectively discharging gas or foam generated from an alkaline liquid in a liquid tank.

Generally, according to a rolling strip manufacturing process of a steel mill, a steel strip is manufactured by hot rolling a slab manufactured in a casting process to produce a steel plate, removing scale of the steel plate, and performing cold rolling, A plurality of passes of cold rolling are carried out in order to make the strip have a predetermined thickness so that annealing is carried out after cold rolling so as to eliminate the stress applied to the strip by rolling, And the workability in the rolling process is enhanced.

However, in the cold rolling process, since the strip adheres to the surface of the steel sheet with a rolling oil, a machine-operating oil, iron powder, dust, or other persistent contaminants, the strip is immediately put into the annealing process without removing it. The contaminants remain on the surface of the strip in the form of a carbide, causing corrosion on the surface of the strip, lowering the strength, damaging the aesthetics of the strip, and causing fatal defects such as discoloration of the surface. Therefore, the cold-rolled strip removes various contaminants adhering to the surface through the electrolytic clean line as shown in FIG. 1 before being put into the annealing process.

The electrolytic clean line is composed of an alkaline liquid storage tank 101, a scrubber 103, a circulation pump 105, a pump motor 107 and various piping as shown in FIG. 1, The strip 109 is pumped into the degreasing washer 103 and the alkaline solution 111 in the storage tank 101 is pumped by the pump 105 to be supplied to the degreasing washer 103 through the supply pipe 113. [ . The supplied alkali solution is sprayed from the nozzle 115 of the supply pipe 113 to the surface of the strip 109 in the degreasing and washing machine 103 to remove various contaminants attached to the surface, The liquid 111 is recovered to the storage tank 101 through the drain pipe 117, purified by the filter 119, and reused.

At this time, the amount of the alkaline solution 111 injected from the nozzle 115 is adjusted to a certain amount by a valve (not shown) of the supply pipe 113. However, if the degreasing operation speed is increased, The amount of gas and bubbles 121 generated in the alkaline solution 111 increases. The amount of gas and foam generated in the alkaline solution increases when the concentration or temperature of the alkaline solution increases, or when the amount of the gas injected increases. Especially, when the gas is saturated, the amount of generated gas increases sharply.

Therefore, the gas and foam discharged through the gas duct 123 are filled with an alkaline solution having a temperature of about 80 to 90 degrees and a controlled concentration (3%), which is sprayed in the degreasing washer 103 The amount of use of the alkaline solution is increased to increase the cost, and it becomes difficult to control the temperature and the usage of the alkaline solution. As a result, defective degreasing occurs, Causing a defect.

In addition, since the level gauge 125 can not accurately measure the level of the liquid level of the alkaline solution due to the gas and bubbles generated during the process of recovering the alkaline solution used for strip degreasing through the drain pipe 117, the concentration of the alkaline solution It is difficult to keep the concentration of the concentration control constant. Therefore, there is a problem that defatting failure occurs due to deviation of the concentration control.

In addition, due to the alkaline liquid mixed in the gas discharged into the atmosphere through the gas duct 123 and the alkaline liquid flowing in the degreasing washer 103 due to the backwashing of the alkaline liquid mixed in the foam or gas and foam in the storage tank 101, There was a problem that pollution was caused.

Therefore, the present invention has been proposed in order to solve the problem of the conventional alkaline liquid storage tank of the coil strip electrolytic clean line, and it is applied to the cold rolling process of the steelworks and the like to remove various foreign substances adhering to the surface of the cold- The alkaline liquid which acts as a degreasing agent in the electrolytic clean line used for the electrolytic cleaner is supplied to the degreasing cleaner and the alkaline liquid storage tank through the supply piping and the drain piping, The present invention has been made in view of the above problems.

In order to achieve the above object, the present invention provides an alkaline liquid storage tank constituting an electrolytic clean line of a cold rolling facility, comprising: rotation aberration provided inside a drain pipe for recovering an alkali solution used from a degreasing cleaner; An eccentric cam mounted on the rotational axis of the rotational aberration provided in the outer case of the pumping cylinder, a pumping cylinder connected to the outer circumferential surface of the gas pipe connected to the gas duct that emits gas generated in the alkaline liquid storage tank, And a hollow piston rod for discharging gas and foam in the storage tank to the outside through the gas piping while repeating the upward and downward movement by the recoil spring. The present invention also provides an apparatus for automatically discharging gas and foam in an alkaline liquid storage tank.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for automatically discharging gas and foam in an alkaline liquid storage tank according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The apparatus for automatically discharging gas and foam in the alkaline liquid storage tank of the present invention is installed in a storage tank for storing a solution having a relatively high viscosity such as an alkaline solution and is used for discharging gas or foam generated in a solution to the outside, As shown in FIG. 2, it is applied to an alkaline liquid storage tank (1) for removing rolling oil of an electrolytic clean line, which is often found in cold rolling facilities of steel mills, The gas or bubbles 21 generated in the alkaline liquid recovered to the alkaline liquid storage tank 1 through the rear drain pipe 17 used to remove the material are discharged through the gas duct 23 to the outside.

2, the apparatus for automatically discharging gas and bubbles in the alkaline liquid storage tank of the present invention includes a rotational aberration 31 installed in the drain pipe 17 and a rotational axis 33 of the rotational aberration 31, A pumping cylinder 39 provided through the upper end of the outer case 2 and a piston rod 39 reciprocating in the pumping cylinder 39 to extract gas and foam in the storage tank 1, (41).

Here, the rotational aberration 31 is a kind of Pelton aberration as shown in Figs. 2 and 3, and is connected to a pair of bearings 66 on the upper surface of the wall of the outer case 2 of the alkaline liquid storage tank 1 A rotary shaft 33 rotatably mounted on the rotary shaft 33 is installed in a portion passing through the drain pipe 17 which collects the alkaline solution used from the degreasing washer 3 and is protruded around the rotary shaft 33 As shown in FIG. 3, the portion where the rotation aberration 31 of the drain pipe 17 is provided is protruded in a semicircular shape in section so as to form an aberration casing 68 have.

An eccentric cam 35 having a rotating shaft 33 as a cam shaft is mounted on the rotating shaft 33 of the rotational aberration 31. The eccentric cam 35 is mounted on the pumping cylinder 39 and the piston rod 41 assembly A plurality of pumping cylinders 39 and piston rod 41 assemblies may be sequentially operated by varying the projecting angles of the eccentric cams 35. As shown in FIG. You may.

As the eccentric cam 35 rotates eccentrically about the rotational axis 33 by the rotational force of the rotational aberration 31 as described above, the gas in the alkaline liquid storage tank 1, together with the piston rod 41, As shown in FIGS. 4 and 5, the pumping cylinder 39 for puffing out the foam has a cylindrical upper body, an upper cap 69 in the form of a cap at the upper opening and a lower cap 70 in the form of a ring at the lower end And screwed. A mounting protrusion 71 protrudes in the middle of the outer circumferential surface and is screwed and fixed onto the support base 72 rising from the upper surface of the outer case 2 of the storage tank 1 with bolts 73, 71 and a gas pipe 37 connected to a gas duct 23 for discharging gas and foam generated inside the alkaline liquid storage tank 1 to the outside.

While the pumping cylinder 39 is repeatedly reciprocated up and down in the pumping cylinder 39 mounted on the outer case 2 of the alkaline liquid storage tank 1 as described above, The piston rod 41 to be discharged is the first to introduce gas and foam into the storage tank 1 through the gas outlet 45 connected to the upper side as shown in FIGS. 4 and 5 so as to discharge gas and foam inside the storage tank 1 To the upper piston (53) at the upper end, from the gas suction pipe (74) at the lower end.

The piston rod 41 is composed of two upper and lower rods 41-1 and 41-2 as shown in FIG. As shown in the drawing, the female screw 48, which is formed at the lower end of the inner circumference of the hollow portion of the upper rod 41-1, and the male screw 49, which is machined at the upper end of the outer circumference of the lower rod 41-2, And the lower rod 41-2 is relatively rotated with respect to the upper rod 41-1 so that the length of the entire rod 41 can be changed. (47) protrudes from the base.

The gas suction pipe 74 at the lower side of the lower rod 41-2 is formed with a plurality of gas suction ports 43 through which gas and bubbles are introduced into the alkaline liquid storage tank 1, In particular, the diameter of the lower rod 41-2 is wider than the diameter of the lower rod 41-2 to smooth the inflow of bubbles. A push rod 75 which is in contact with the eccentric cam 35 and causes the piston rod 41 to move up and down is downwardly protruded on the bottom surface of the gas suction pipe 74. The push rod 75 is connected to the piston rod 41 The shaft support 76 is vertically slid and guided along a guide bushing 77 mounted at the center of the shaft support 76 so that the movement axis of the shaft support 76 is not disturbed by the up- 2) It is attached and fixed at the top of the inner circumference.

The upper rod 41-1, which is elastically coupled to the lower rod 41-2 in a stretchable manner, has a truncated lower sheet 79 attached to the outer peripheral surface of the lower end processed with the female thread 48, And a piston ring 56 closely fitted to the inner peripheral surface of the cylinder 39 is fitted on the outer circumferential surface of each of the upper and lower pistons 53 and 54. The pistons 54 are attached to the upper surface of the piston 53, The gas discharge port 45 protruded between the upper piston 53 and the lower piston 54 is positioned so as to coincide with the inlet of the gas pipe 37 at the top dead center of the upward and downward movement by the eccentric cam 35.

The piston rod 41 of the cylinder 39 is returned to its original position by the restoring force of the reaction spring 36 as soon as the pushing force of the push rod 75 by the eccentric cam 35 is released, The pressing shaft 55 inserted in the upper portion is inserted into the recessed hole 58 formed at the center of the upper surface of the upper piston 53 to press the piston rod 41 through the upper piston 53, An auxiliary piston 57 which forms a pumping chamber 59 together with an upper piston 53 is attached to the upper portion of the piston 57. A piston ring 56 for sealing is also mounted on the outer peripheral surface of the piston 57. [ The upper seat 80 protecting the pistons 53, 54 and 57 from the flow and pressure inside the cylinder 39 together with the lower seat 79 is in the form of a truncated cone like the lower seat 79, ) Of the upper cap 69. The upper cap 69 is inserted in the lower portion. The recoil spring (36) inserted between the upper seat (80) and the auxiliary piston (57) is repeatedly compressed and restored by the pressure shaft (55).

The pumping portion 51 sucking the outside air by the pumping chamber 59 formed between the upper piston 53 and the auxiliary piston 57 and discharging the outside air to the gas pipe 37 has the piston 53, An intake pipe 61 for sucking the outside air into the pumping chamber 59 at the time of descent and an exhaust pipe 63 for discharging the air in the pumping chamber 59 to the outside when the pistons 53, Respectively. At this time, the exhaust pipe 63 is installed so that the discharge port 62 is inserted into the gas pipe 37 and directed toward the outlet side of the gas pipe 37 as shown in the figure. And check valves 65-1 and 65-2 for opening and closing the pipes 61 and 63 themselves are provided at the portions of the intake pipe 61 and the exhaust pipe 63 that are in contact with the inlet and the outlet of the cylinder 39 .

The operation of the apparatus for automatically discharging gas and foam in the alkaline liquid storage tank according to the embodiment of the present invention will be described as follows.

As described above, when the automatic gas and foam automatic drainage device according to the present invention is installed in the alkaline liquid storage tank 1 used in the electrolytic clean line of the steel cold rolling mill, the degreasing and washing machine 3, as shown in FIG. 2, The alkaline liquid used to remove contaminants adhering to the surface of the strip is recovered into the alkali storage tank 1 through the drain pipe 17 with a drop of a predetermined height or more from the degreasing washer 3, The rotating aberration 31 provided inside the storage tank 1 inserted portion of the tank 17 is impacted by the falling alkaline liquid and rotated at a high speed.

In this case, the rotational speed of the rotational aberration 31 is automatically adjusted according to the amount of the alkaline solution and the amount of generated gas and bubbles. In other words, if the amount of the recovered alkaline solution is increased, Since the amount of rotation and the number of revolutions of the rotation aberration 31 are increased together with the increase of the amount of bubbles and gas, the amount of discharge by the apparatus is also increased, so that the pressure in the tank 1 can be always maintained at a constant value Whereby the alkaline solution filtered by the filter 19 by the circulating pump 5 driven by the motor 7 is pumped back to the degreasing washer 3 and reused for degreasing the cold rolled strip Can be performed stably.

More specifically, when the liquid receiver wing 67 is impacted by the alkali liquid falling through the drain pipe 17 and the rotation aberration 31 is rotated, the liquid receiver wing 67 is attached to the aberration rotation shaft 33 at regular intervals The plurality of eccentric cams 35 also rotate together. The piston rod 41 which is in contact with the eccentric cam 35 by the push rod 75 is pushed up in the pumping cylinder 39 and the piston rod 41 of the upper rod 41-1 The gas and bubbles which have flowed into the lower rod 41-2 through the gas suction port 43 of the gas suction pipe 74 reach the storage tank 1 And is discharged to the outside through the gas ducts 23 through the gas discharge port 45 and the gas piping 37. [ At this time, if a deviation occurs in which the gas discharge port 45 and the gas pipeline 37 can not be located on the same line even though the piston rod 41 reaches the top dead center, the adjustment screw 47 is rotated in the forward and reverse directions, -1, the entire length of the piston rod 41 is adjusted by relatively moving the lower rod 41-1 up and down to eliminate the deviation.

However, since there is a certain limit in discharging the gas and foam by the internal pressure of the storage tank 1 as described above, the pumping unit 51 is installed in the pumping cylinder 39 to make it smooth. The check valve 65-2 of the exhaust pipe 63 is closed while the piston rod 41 is moved downward toward the bottom dead point by the restoring force of the spring 36 and the check valve 65 -1 is opened to allow outside air to flow into the pumping chamber 59 which is sealed between the upper piston 53 and the auxiliary piston 57. The check valve 65-2 of the exhaust pipe 63 is opened while the piston rod 41 is lifted up toward the top dead center by the eccentric cam 35 and the check valve 65 -1 is closed, the outside air introduced into the pumping chamber 59 is extruded through the exhaust pipe 63 into the discharge port 62. Accordingly, the high-pressure outside air is discharged to the gas pipe 37. At this time, the portion of the gas pipe 37 through which the intake pipe 61 is inserted is remarkably reduced as compared with a portion having a different sectional area like a venturi pipe, Since the high-speed airflow passes through the discharge port 62 of the discharge port 63, the pressure in the vicinity of the discharge port 62 is remarkably reduced. Therefore, it is possible to increase the performance of suction of bubbles and gas sucked from the gas suction pipe 74 and discharged through the gas discharge port 45 through the piston rod 41.

As described above, according to the apparatus for automatically discharging gas and foam in the alkaline liquid storage tank according to the present invention, gas and foam or alkaline solution generated in the process of spraying the alkaline solution onto the cold-rolled strip in the degreasing cleaner are recovered into the storage tank The gas and foam generated in the circulation process pumped by the degreasing cleaner can be stably discharged automatically in proportion to the amount of generated gas, so that it is possible to prevent radical discharge of gas and bubbles. Therefore, there is no need to increase the amount of the heat source steam used to maintain the inside of the storage tank at a constant temperature, and it is possible to prevent the alkali concentration of the high concentration from being contained in the gas and foam, It is possible to prevent the cost from rising due to an increase in the amount of liquid used.

In addition, since the amount of gas and foam can be increased by increasing the amount of gas and foam generated in the storage tank, the amount of gas and foam remaining in the tank can always be kept below a certain level, It is possible to accurately measure the concentration of the alkaline solution, and thus to prevent deterioration of the quality of the cold-rolled strip due to the defective degreasing caused by the deviation of the alkaline solution concentration control.

In addition, it is possible to minimize the amount of gas and foam that is released into the atmosphere, and to prevent the alkaline liquid from flowing back to the degreasing cleaner and overflowing, thereby preventing contamination of the working environment and equipment. As a result, It is possible to improve the productivity of the cold rolling mill of the steel mill and the quality of the cold rolled strip.

Claims (3)

A rotary aberration 31 provided in the drain pipe 17 for recovering the alkali solution used from the degreasing and washing machine 3 and a rotary aberration 31 provided in the outer case 2 of the alkaline liquid storage tank 1, A gas piping 37 connected to a gas duct 23 for discharging gas generated in the alkaline liquid storage tank 1 is connected to the outer circumferential surface of the pumping cylinder 35, The gas and bubbles in the storage tank 1 are repeatedly moved upward and downward by the eccentric cam 35 and the recoil spring 36 in the pumping cylinder 39 to the gas pipe 37 And a hollow piston rod (41) for discharging the gas and the foam to the outside. The method according to claim 1, The piston rod 41 is exposed to the outside of the storage tank 1 and has an upper portion 41-1 in which a gas outlet 45 is connected to a position corresponding to the gas pipe 37 at a top dead center, The upper portion 41-1 and the lower portion 41-2 of the piston rod 41 are connected to each other by male and female screws 41-2, (48, 49) so that the total length can be adjusted by the adjusting screw (47). The method according to claim 1, An upper piston 53 attached to the upper end of the piston rod 41 so as to form a pumping chamber 59 together with the upper piston 53 within the cylinder 39; An auxiliary piston 57 mounted on a pressurizing shaft 55 for pressurizing the pumping chamber 53, an intake pipe 61 communicating with the wall surface of the cylinder 39 to supply outside air to the pumping chamber 59, (63) communicating with the gas pipe (37) from the wall surface of the cylinder (39) so as to allow the outside air flowing into the gas pipe (59) to flow out toward the outlet side of the gas pipe (37) And a pumping section (51) constituted by check valves (65-1, 65-2) for alternately opening and closing the exhaust pipe (61) and the exhaust pipe (63) Automatic discharge device.

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