SU1080892A1 - Apparatus for joint cooling of rolled stock,reinforcing bars and rolls - Google Patents

Abstract

A DEVICE FOR JOINT COOLING OF RENT, PREFERRED STEEL AND ROLLED ROLLS, including a series of high pressure water supply units, an annular chamber with a slit hole, a counterflow cooling chamber, an inlet funnel, an arcuate marrow, a comb. from the case, connected to the annular chamber with an additional tube, and the discharge wiring itself with a passageway, characterized in that In terms of braking rolling and saving Yoda, the output wiring itself is provided with a funnel, an extended part directed towards the countercurrent cooling chamber, forming an annular gap with the wall of the output wiring body, and the cross-sectional areas of the flow channel and annular gap are in a 1: 1-1 ratio: 1.5. e yr x 1 N9

Description

The invention relates to rolling production, and specifically to the production of heat-treated rolled products in a rolling mill stream.

Nowadays, in a number of countries, the accelerated cooling of reinforcing steel is widely used for thermal strengthening in the flow. In order to obtain a favorable combination of mechanical properties of heat-treated rolled products, accelerated cooling is performed directly behind the finishing stand. Cooling takes place in conductive-type chambers, where water is pumped through nozzles under pressure from Yania to 60 MPa. The flow of water may move against and with the rolling movement. . Contrast cooling is more efficient than two or three times of flow. However, the countercurrent is slowed down by rolling, especially at the moment of rolling out of the rolls, when rolling is not forced through the cooling chambers. In this case, the rental may stop in the cooling chamber, which is unacceptable during continuous rolling, as the incoming rental piece will overtake the previous one and brooming is possible. The greatest interest is represented by. It uses countercurrent cooling directly behind the finishing stand to cool and calibrate the rolls with water used to cool the car. However, in order to compensate for the inhibitory effect of the countercurrent, it is necessary to install several linear devices along the rolling movement line, which lengthens the installation for cooling the rolled product, increases water consumption and complicates its operation.

A device for cooling rolled products is known, consisting of countercurrent and direct cooling chambers with slot nozzles, which are connected between each other by a conduit pipe provided with a nozzle with means for adjusting its flow cross section l.

A disadvantage of this device is that the direct-flow device is unable to compensate for the fully retarding effect of countercurrent, especially when cooling reinforcing steel having a corrugated surface. This is due to the fact that with counterflow, the rates of water and rolled products are added together, and during flow, they are subtracted. And the resistance is proportional to the sum of the speeds, the higher the amount, the greater the resistance. And, besides, the resistance depends on the density of the Coolant Flow. If water is cooled with water without air leaks in the nozzles (in the known device, this is possible when the hole in the nozzle is completely closed), the resistance to rolling in the counter-current nozzle is greatest, and the transporting effect in the nozzle is higher. 5 But still, the flow injector cannot significantly reduce the braking effect. You can increase the flow of water in the flow device in three to four times more than

0 in countercurrent, but the economic performance of the device deteriorates sharply. In addition, it is possible to install several additional cooling directors, but

5 the effect will be the same: unjustified water consumption, complication of the device operation. If you completely open the hole in the pipe wiring pipe, then with significant

Q air suction due to the injection effect, the rental will be cooled by a water-air mixture. The resistance to rolling in the off-current nozzle is significantly reduced, but at the same time

5, the cooling efficiency of the rolled stock will decrease, and cooling the device in this mode is uneconomical. It is possible with the help of automation to completely open the hole in the conduit pipe nozzle at the moment of rolling out of the pipe in order to reduce the resistance to rolling through the countercurrent cooling chamber, but this will require an additional automation system, which will significantly complicate the operation of the device.

The closest to the invention to the technical essence is a device comprising a consistently and coaxially arranged high pressure water supply unit, an annular chamber with a slot, a countercurrent cooling chamber, an inlet funnel coupled by a converging part with a countercurrent cooling chamber, and the lead wiring consisting of housing, connected to the annular chamber with an additional tube, and the actual wiring with

0 through channel. The device also includes a pre-cut-off chamber and cut-offs 2.

A disadvantage of the known device is that it is installed in relation to the cooled car and will not supply water used for cooling the car to the shaft, but will cut it off in the separator and drain it into the sump, part of it will be fed into the additional ring

0 camera and cooling chamber. This eliminates air leakage, and the rolled products are cooled most efficiently. But therein lies another drawback. When leaving rolled out

5 rolls, due to the maximum resistance, it can stop in the device, slow down. In addition, the use of this device, even with a counter-current cooling chamber, is difficult to cool the rolls. As is known, on the output side of the rolled stock rolls there is a lead-through wiring installed on the roll bar. By installing a counter-flow chamber coaxially with it, it is impossible to cool the rolls efficiently, since the wiring has a small hole, only 1.2-1.4 times larger than the rolling passing through it, and its walls prevent water from entering the rolls from the counter-flow chamber cooling, but only dissipate the flow of the cooler. When cooling the reinforcing steel, rolling its ribbed surface in the narrow lead wire completely prevents water from entering the yalki, and it is thrown out of the lead wiring as a pump. Therefore, to cool the rolls of the finishing stand, it is necessary to additionally install a device for cooling the rolls with an additional supply of high-pressure water, which is impractical.

The aim of the invention is to reduce the braking of the rolled stock and save the coolant.

This goal is achieved by the fact that in the device including a high-pressure water supply unit, an annular chamber, a slot-hole chamber, a counter-flow cooling chamber, an inlet funnel coupled by a tapered portion with a counter-flow cooling chamber, the output wiring consisting of a housing connected with an annular chamber with an additional tube, and the actual lead wiring with a through-passage, the lead wiring is equipped with a funnel, an extended part directed to the counterflow chambers cooling the D to form with the wall of the lead-out wiring annular body, the gap, and the area of the flow channel cross sections and the annular gap are in a ratio Isl - 1: 1.5.

The drawing shows the proposed device, the cut ..

The device comprises a water supply unit 1, which is an injection nozzle, having a body 2, a wiring 3 with an annular nozzle 4 and two openings 5 and 6: one for connecting to the bh-cooling chamber and the other for the output of the car. It is connected coaxially with the annular chamber 7 to the g. Hole 8, which encloses the counterflow cooling chamber 9 in a small area adjacent to the high pressure water supply unit 1. The cooling chamber is provided with an inlet funnel 10 to facilitate the entry of the rental into it. The funnel 10 is connected to the output wiring housing 11, in which the lead wiring 12 is installed with the receiving funnel 13 to facilitate the entry of high pressure water into the through passage 14 of the lead wiring. Polbst formed by the body 11 of the lead wiring and actually

The lead wire 12 is connected by a tube 15 to an annular chamber 7. A valve 16 is installed on the tube 15 to regulate the amount of water entering the annular chamber 7.

five

The device works as follows.

High-pressure water is supplied to the water supply unit 1, from Kofoporo it enters the cooling chamber 9. Coolant flow moves through the chamber.

0 9 cooling at high speed, while the static pressure drops below atmospheric (the total flow pressure is the sum of the dynamic pressure and the static pressure.

5 Moving with. The high flow rate has a high dynamic pressure, which appears when the obstacles are bending around, etc., therefore, due to the dynamic pressure, the total pressure of the flow is much greater than the static pressure, and a vacuum is created in the annular chamber 7. Next, the flow of the cooler enters the cavity, which is called the receiving funnel 13 and

5 by a funnel 10. From this cavity, the flow of the cooler can flow either through the receiving funnel 13 into the lead channel 14 and onto the rolls, or through an annular opening formed by the housing 11 of the outlet pro- vodka and the receiving funnel 13, into the cavity formed by the housing 11 and lead wiring 12. From this cavity, water enters the rolls through the annular opening 17, and a part of the water

5 under the action of pressure. Flow of water in the cavity, and also due to the vacuum in the annular chamber 7 enters this chamber T and through the slit holes 8 enters again into chamber 9

0 cooling. In that case, if through the cooling device passes rolling, pushed by rolling rolls, the flow of the cooler from the cavity formed by the funnels 13 and 10,

5 enters the cavity formed by the housing 11 and the lead wiring 12, and cools the rolls through the opening 17, a part of it through the tube 15 enters the annular chamber 7 and through bore 8 into the cooling chamber 9.

The amount of water entering chamber 7 during the adjustment process is controlled by valve 16. At the same time, the cooling capacity of the device is maximal, since the cooling is performed with a non-water-rich mixture with a high air content (up to 80 formed by suction kata from the device, and water flow with a minimum air content (up to 5%). This is due to the supply of additional water through the annular chamber 7 to the cooling chamber 9. Through the receiving hopper 13 the water enters the passage Output port 14, however, from there it is completely driven out of the rolled through channel 14. Armature steel with a ribbed surface, a passage through the canal of the outlet funnel, which, under the conditions of stable provision for rolling out of the rolls, is made only. 2-1.4 times the cross-section of the rolling stock, due to the forcing action as a pump, prevents the passage of water through the lead-through wiring 12, and water does not flow through the register (la rolls. As soon as the rolling leaves the rolls and its rear part, the end, passes under the action of inertial forces through the lead-through wiring 12, the coolant flows through the receiving funnel 13 through the internal channel 14 of the lead-through wiring 12 to the rolls. Passing through the inner channel 14 is preferable than through the annular gap formed by the funnel 13. and the lead wiring body, since the receiving funnel 13 is located coaxially with the cooling chamber 9, and the cross section of the passageway 14 is equal to or larger than the annular gap section. In this case water almost does not flow into the cavity formed by the lead wiring and lead wiring, but is fed into the annular chamber 7, and from there into the chamber 9. The saturation of the water / air mixture with air increases. Resistance to rolling decreases sharply, and rolling under the action of inertia and roller table forces freely leaves the device. At the same time, the part of the car that is cooled by an air-water mixture with a high content of air is cooled with even the same intensity as the previous part of the car. There is no paradox here. The length of the cooling chamber is 2.5-3 m; its rolling takes about 0.25-0.3 s at a rolling speed of 10 m / s. During the transitional 1; 1 processes associated with a decrease in the saturation of the water-air mixture with air from the minimum content to the maximum, the rolling slightly slows down the car, but not so much that the next part of the car will catch up with the previous one. The transit time is increased by 0.05 seconds, and the pause time between the pieces is 3-5 seconds. Thereby, a reduction in the intensity of cooling compensates for an increase in the cooling time in the cooling chamber. Studies have shown that the ratio between the cross-section of the passage passage 14 of the lead-through and the annular gap between the receiving funnel 13 and the lead-through housing 11 should not be less than 1: 1.5, since otherwise when the rolled stock leaves the rolls, water will still be drained the chamber 9 is not cooled and a reduction in braking effect is observed. The ratio of these sections should not be greater than 1: 1.5, since the effectiveness of the rolled stock is reduced, since most of the water would go through the passage channel 14 and much less through the annular cavity into the cooling chamber 9. The use of the proposed device allowed using countercurrent devices with flow emitters with maximum efficiency and thereby reducing the number of direct cooling devices and reducing the number of logs due to stalling of rolled products in countercurrent cooling chambers and reducing water consumption by 30%, which improved the working conditions shop and factory water supply. The economic effect of cooling 20,000 tons of steel number 16 and number 18 for the purpose of thermal strengthening will be 35,000 rubles. in year.

Claims (1)

DEVICE FOR JOINT COOLING COOLING, BASICALLY FOR REINFORCED STEEL, AND ROLLING ROLLS, including sequentially and coaxially arranged high-pressure water supply unit, an annular chamber with a slit hole, a counter-flow cooling chamber, an inlet funnel connected to the tapering part, an outlet flow countercurrent cooling chamber a housing connected to kol- ^J tsevoy chamber extension tube, and the lead-out wiring itself with the passageway, characterized in that, to reduce the rolling braking and water saving, the output wiring itself is equipped with a funnel expanded. partly directed to the counterflow cooling chamber, forming an annular gap with the wall g of the housing of the output wiring, and the cross-sectional areas Г of the passage channel and the annular gap are in the ratio 1: 1 - .1: 1,5, ζ