KR100928819B1 - Descaling device of mini mill process - Google Patents

Abstract

The present invention relates to a descaling device for removing the scale generated on the slab manufactured in the mini-mill process, the scale of the mini-mill process to obtain the collision pressure required to remove the scale by adjusting the injection distance of the high pressure water according to the pump pressure It relates to a removal device.

The present invention includes an upper and lower conveying means having lower cylinders fixed and installed on both sides of the slab, a pinion driven by a motor on the side of the lower cylinder, and an upper cylinder on which a rack engaged with the pinion is fixed; A high pressure water header fixed to an upper portion of the upper cylinder to supply high pressure water, a high pressure water injection nozzle fixed to the high pressure water header, a high pressure water discharge pipe located in front of the high pressure water header, and a slope formed at a lower portion of the high pressure water discharge pipe A guide plate is formed integrally therein; And a pinch roll elastically installed in front and rear of the body.

Therefore, according to the present invention, it is possible to adjust the injection distance to obtain the collision pressure required to remove the scale, to prevent the surface defect by preventing the inflow of the scale into the rolling mill, and to reduce the surface temperature deviation of the slab To provide.

Description

Descaler of mini mill process {AN APPARATUS FOR REMOVING SCALE ON SLABS IN MINI-MILL PROCESS}

1 is a schematic view of a conventional descaling device;

2 is a perspective view of a descaling device of the mini mill process according to the present invention;

Figure 3 is a cross-sectional view of the upper, lower transfer means of the descaling device of the mini-mill process according to the present invention;

Figure 4 is a cross-sectional view showing the structure of the pinch roll of the descaling apparatus of the mini-mill process according to the present invention;

5 is a view showing the operating state of the descaling apparatus of the mini-mill process according to the present invention

(a) is a cross-sectional view when removing the scale,

(b) is sectional drawing at the time of rise.

Explanation of symbols on the main parts of the drawings

10 ..... Up and down transfer means 12 ..... Lower cylinder

14 ..... pinion 16 ..... rack

18 ..... upper cylinder 20 ..... motor                 

30 ..... Body 32 ..... High Pressure Header

34 ..... High pressure water discharge pipe 36 ..... Signage

38 ..... high pressure jet nozzle 50 ..... pinch roll

52 ..... Spring 54 ..... Guide Body

56 ..... support bar 64 ..... bearing

62 ..... Bearing Block 66 ..... Nut

The present invention relates to a descaling device for removing the scale generated in the slab manufactured in the mini-mill process, and more specifically, by adjusting the injection distance of the high pressure water in accordance with the pump pressure having a high-pressure water injection head capable of shangdongdong The present invention relates to a descaling device of a mini mill process that can obtain a collision pressure required for descaling.

In general, a primary scale is formed on the surface of the slab, which is a reheated rolling material in a heating furnace of a hot rolling process, and a secondary scale is formed on the surface of the slab as time passes. In the case of rolling without the scale, the scale is pressed into the surface of the slab and causes the surface defect of the product. Therefore, in order to produce a product without scale defect in the hot rolling process, a scale removing device is installed at the inlet and outlet of the roughing mill and at the inlet of the finishing mill. Doing.

On the other hand, there are various methods of removing the scale, but the high pressure water of 100-200 kgf / cm2 is sprayed on the surface of the hot rolled sheet through the high pressure water jet header of about 165 (mm) diameter to apply thermal stress between the scale and the slab matrix structure. The most common method is to cause the vertical crack in the scale by using the quenching effect to be generated and then remove the scale by high pressure water.

The high pressure water injection header is equipped with an injection nozzle, and overlaps the injection pattern of the high pressure water injected by the injection nozzle at a predetermined interval so that a uniform high pressure water collision pressure is obtained over the entire width of the hot rolled sheet. Japanese Patent Laid-Open No. 52-142047, Japanese Patent Laid-Open No. 62-47086, and Japanese Patent Laid-Open No. 1-278907 are disclosed.

In addition, as shown in FIG. 1, the movable height descaler 100 developed by the conventional ThyssenKrupp Stahl is a high-pressure water pipe connected to the high-pressure water injection header 102. (104) By connecting itself to a ball point type (joint) 104a of the ball point type (ball point type) is configured to move both the high-pressure water pipe 104 and the high-pressure water injection header 102 itself at once, but the connection portion Since it is constantly moving and moving the weight itself up and down repeatedly, there is a high risk of breakage of the connecting portion and difficult control of the injection height was difficult.

In the conventional mini mill rough rolling process, the descaling device uses the pump at a pressure lower than the minimum pressure of the high pressure pump, so it is possible to change the proper spraying conditions such as the pump pressure and the spraying height according to the spraying nozzle at any time. However, the correct operating conditions are not set.

Due to the lack of a dedicated measuring equipment for the vertical height from the injection nozzle, which is a direct influence on the high-pressure water injection pattern, to the pass line of the equipment, the lead angle of the header and the parallelism with the table roller, etc. It was difficult to set working conditions.

In addition, when an excessive amount of high pressure water is used, the surface temperature is unevenly generated, resulting in surface scale removal rate variation, surface stripe defect of hot rolled sheet, uneven material and uneven wear of the work roll for rolling and prolonging the work time. There was a problem.

In addition, the edge heater is also damaged due to the inflow of the scale or high pressure water.

The present invention is to solve the conventional problems as described above, the object is to provide a high-pressure water injection header capable of shangdongdong by adjusting the injection distance of the high pressure water in accordance with the pump pressure to obtain the collision pressure required to remove the scale The present invention provides a descaling device of the mini-mill process that can uniformly reduce slab surface temperature deviation and reduce slab surface temperature deviation and prevent damage of the slab. .

In order to achieve the above object, the present invention is a device for removing the scale generated in the slab manufactured in the mini-mill process, the lower cylinder fixed to, installed on both sides of the lower slab, the pinion is motor-driven in the side of the lower cylinder, Up and down conveying means having an upper cylinder is fixed on the outer circumference and vertically guided by a lower cylinder is engaged with the pinion; A high pressure water header fixed to an upper portion of the upper cylinder to supply high pressure water, a high pressure water injection nozzle fixed to the high pressure water header, a high pressure water discharge pipe having a portion of an outer circumferential surface opened in the upper front of the high pressure water header, and the high pressure water discharge pipe A body formed integrally therein with a guide plate guiding the injected high pressure water into the high pressure water discharge pipe and formed to be inclined at a lower portion thereof; And a pinch roll elastically installed in front and rear of the body to be in close contact with the slab.

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

2 is a perspective view of a scale removing device of the mini mill process according to the invention, Figure 3 is a cross-sectional view of the upper and lower transfer means of the scale removal device of the mini mill process according to the present invention, Figure 4 is a mini mill process of the present invention Figure 5 is a cross-sectional view showing the structure of the pinch roll of the descaling apparatus, Figure 5 shows the operating state of the descaling apparatus of the mini-mill process according to the present invention (a) is a cross-sectional view when removing the scale, (b) is a rise It is a cross section of.

2 and 4 show a descaling apparatus 1 of the mini mill process according to the present invention, the components of which are described in detail as follows.

The scale removal apparatus 1 of the mini-mill process according to the present invention includes the upper and lower conveying means 10, the body 30, and the pinch roll 50. First, the upper and lower conveying means 10 The following description is made.

As shown in Figures 2 and 3, the upper and lower conveying means 10 is fixed to the lower cylinder 12 on both sides of the lower portion of the slab to be transferred in the mini mill process, the inner peripheral surface of the lower cylinder 12 The cylindrical guide member 12a having a portion of the outer circumferential surface is inserted and fixed thereto.

In addition, a motor 20 fixed by a motor bracket 21 is positioned on a side of the lower cylinder 12 in which a part of an outer circumferential surface thereof is opened, and the motor 20 has a pinion 14 on its shaft 20a. ) Is fixed.

At this time, the pinion 14 has a portion of the outer circumferential surface where the tooth is formed is introduced into the lower cylinder 12 through the open portion of the lower cylinder 12, wherein the inner circumferential surface of the lower cylinder 12 The upper cylinder 18 is inserted into the guide member 12a which is inserted into and fixed to the guide member 12a.

A rack 16 is fixed to an outer circumferential surface of the upper cylinder 18, and a hose 19 is connected to a lower portion of the upper cylinder 18 so that the high pressure water is supplied into the upper cylinder 18 to form an opening formed on the outer circumference of the lower cylinder 12. Is connected to the high pressure water supply (not shown) through.

Meanwhile, as shown in FIG. 3, the rack 16 is fixed to the outer circumferential surface of the upper cylinder 12 so that the rack 16 is inserted into the guide member 12a inserted into the inner circumferential surface of the lower cylinder 12. Is engaged with the pinion 14, in which the rack 16 is part of the outer peripheral surface of the guide member 12a is open, so that the rack 16 and the guide member 12a do not interfere.

The upper and lower conveying means 10 configured as described above are disposed on both lower sides of the slab to be conveyed in the mini mill process.

As shown in Figure 2 and 3, the upper pipe 18 of the upper and lower conveying means 10 configured as described above is bent vertically and the connection pipe 15 having a flange is flange-coupled .

On the other hand, the inside of the body 30, the high-pressure water header 32, which is supplied with high-pressure water from both sides is integrally formed by a rib, the connection pipe 15 is flanged on both sides of the high-pressure water header 32 It is coupled by the high pressure water is supplied into the high pressure water header 32, the body 30 is raised and lowered as the motor 20 of the up and down conveying means 10 is driven.

The high pressure water injection nozzle 38 is fixed to the slab so as to be inclined to the slab, and the high pressure water injection nozzle 38 is in communication with the high pressure water header 32 to allow the high pressure water header to be inclined. The high pressure water supplied to 32 is sprayed to be inclined on the surface of the slab.

As shown in FIG. 5, the body 30 has a high pressure water discharge pipe 34 having a lower surface open and a portion of an outer circumferential surface thereof opened at an upper front thereof, and a lower portion of the high pressure water injection nozzle. An inclined guide plate 36 is integrally formed so that the high pressure water injected from the 38 is guided into the high pressure water discharge pipe 34 through the open outer circumferential surface of the high pressure water discharge pipe 34.

In addition, the front and rear of the body 30 is provided with a pinch roll 50 provided to be in close contact with the slab by the spring 52, the structure thereof will be described as follows.

As shown in Figure 2 and 4, the front and rear sides of the body 30, the guide body 54 of the vertically bent shape is flange-coupled, and the guide body 54 is bent vertically The support bar 56 to which the disc 56a is fixed is inserted with the spring 52.

That is, one side of the support bar 56 is inserted into the spring 52 and positioned in the guide body 54, wherein the spring 52 is between the disc 56a and the inner surface of the guide body 54. Located.

At this time, as shown in Figure 4, the guide body 54 is coupled to the departure prevention tool (54a), the disc 56a fixed to the support bar 56 to the departure prevention tool (54a) By being caught, the support bar 56 does not deviate from the guide body 54 and allows the elastic force of the spring 52 to be transmitted to the support bar 56.

At this time, the pinch roll 50 is fixed to the other side of the support bar 56 so as to be rotatable. The structure thereof will be described below.

As shown in FIG. 4, the bearing block 62 having the bearing 64 inserted therein is screwed to both sides of the pinch roll 50, and the support bar 56 is inserted into the inner ring of the bearing 64. At this time, the nut 66 is screwed to the male screw portion formed in the support bar 56.

As described above, the pinch rolls 50 are rotatably fixed by the support bars 56 rotatably coupled to both sides of the pinch rolls 50 and on the slab surface by the elastic force of the spring 52. Elastically close.                     

Referring to the operation of the descaling device 1 of the mini-mill process according to the present invention configured as described above are as follows.

The descaling apparatus 1 of the mini-mill process according to the present invention is a high-pressure water sprayed to the high-pressure water jet nozzle 38 is inclined to the cylindrical high-pressure water header (32) is fixed to the impact pressure required to remove the scale for each steel type Up and down the transport means 10 is operated to raise and lower the body 30 so as to obtain.

That is, as shown in Figure 5, as the pressure of the high-pressure water pump (not shown) can change the injection distance (h) and the same high-pressure water collision according to the thickness of the slab or hot-rolled bar (bar) is injected The pressure can be secured.

Thus, the scale from the slab or hot bar is removed, the operation of which is carried out as follows.

As the motor 20 of the up and down conveying means 10 is electrically connected to an operation panel (not shown), the motor 20 is driven by a set value set in the operation panel (not shown) to rotate the pinion 14. The rack 16 engaged with the pinion 14 is to be raised or lowered, which causes the body 30 to rise and fall vertically on the slab to increase the spray height according to the pressure of the high-pressure water pump (not shown). It is set correctly.

At this time, the high pressure water injection nozzle 38 determines the injection flow rate of the high pressure water, and in order to minimize the drop in the surface temperature of the slab during the high pressure water injection using a nozzle with a flow rate of 10 ~ 20 (l / min) do.

The high pressure water jet nozzle 38 is fixed to the high pressure water header 32 so as to be inclined at 15 ° in a direction opposite to the rolling direction with respect to the vertical line of the pass line in the rolling process, thereby causing a collision. Loss of pressure occurs, but prevents the occurrence of an intercalated scale surface defect caused by flowing out of the slab by the high pressure water into the rolling mill (not shown) together with the high pressure water.

The implantable scale defect of the scattering scale is injected from the high pressure water injection nozzle 38 and the high pressure water discharge pipe 34 along the guide plate 36 has the high pressure water repelled from the slab and the scale dropped from the slab along the guide plate 36. It is prevented by being guided to and discharged.

In addition, the high pressure water and the scale that are not discharged to the high pressure water discharge pipe 34 by the guide plate 36 is introduced into the rolling mill (not shown) by the pinch roll 50 installed in front and rear of the body 30. The pinch roll 50 is always in contact with the slab surface by the spring 52 even when the body 30 is raised and lowered, thereby preventing the inflow into the rolling mill of the scale dropped from the high pressure water and the slab. Will be.

As described above, the pinch roll 50 prevents the high pressure water and the scale dropped from the slab from flowing out of the front and rear of the body 30, wherein the guide plate 36 has an angle of 45 ° or more with the vertical direction of the slab. The high pressure water repulsion is easily guided to the high pressure water discharge pipe 34 by being formed to achieve the above.                     

Table 1

Table 1 shows a result of comparing the conventional scale removing apparatus with the scale apparatus according to the present invention, wherein the vertical distance (h) between the high pressure water injection nozzle and the hot rolled sheet surface is set to 80 to 180 (mm) Change the pump pressure to 50 ~ 150kgf / cm2 and change the impact pressure index, scale generation rate and edge heater operation rate according to the change of high pressure pump pressure and injection distance by using injection nozzle with injection flow rate of 14 (l / min). Table 1).

In addition, in the present invention, the high-pressure water injection nozzle 38 is mounted to be inclined, but the injection angle of the high-pressure water injection nozzle 38 is provided by providing the pinch roll 50 which is always in contact with the surface of the slab by the spring 52. Even if it is installed perpendicular to the rolling process pass line, the scale does not flow into the rolling mill, so it is possible to further increase the collision pressure of the high pressure water.

According to the present invention as described above, by providing a high-pressure water injection header 38 capable of shangdongdong, by adjusting the injection distance of the high-pressure water according to the pump pressure accurately, the collision pressure necessary to remove the scale can be obtained, the excessive amount of high-pressure water By not using, the slab surface temperature deviation can be reduced and the edge heater can be prevented from being damaged.

In addition, since the scale does not flow into the rolling mill (not shown), it is possible to prevent surface defects and to prevent uneven wear or damage of the rolling roll.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (2)

In the apparatus for removing the scale generated in the slab manufactured in the mini-mill process, The lower cylinder 12 fixed and installed at both sides of the lower side of the slab, the pinion 14 motor-driven at the side of the lower cylinder 12, and the rack 16 meshing with the pinion 14 is fixed on the outer circumference Up and down conveying means (10) having an upper cylinder (18) guided vertically by the lower cylinder (12); A high pressure water header 32 fixed to the upper portion of the upper cylinder 18 to supply high pressure water, a high pressure water injection nozzle 38 fixed to the high pressure water header 32, and an upper front of the high pressure water header 32; The high pressure water discharge pipe 34 in which part of the outer peripheral surface is opened, and the guide plate 36 which is formed to be inclined under the high pressure water discharge pipe 34 to guide the injected high pressure water into the high pressure water discharge pipe 34 are integrated therein. Body 30 formed of; And A pinch roll (50) disposed in front and rear of the body (30) and elastically installed to be in close contact with the slab. According to claim 1, The pinch roll 50 is a support bar 56 is fixed to the pinch roll 50 is rotatable in the cylindrical guide body 54 fixed to the front both sides of the body 30 is a spring 52 and the descaling device of the mini-mill process, characterized in that inserted.

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