CN212494559U

CN212494559U - Aerial fog cooling ring for hot rolling high-strength bar

Info

Publication number: CN212494559U
Application number: CN202021418968.3U
Authority: CN
Inventors: 王卫卫; 肖金福; 白宇
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 2020-07-18
Filing date: 2020-07-18
Publication date: 2021-02-09
Anticipated expiration: 2030-07-18

Abstract

An aerosol cooling ring for hot rolling of high-strength bars belongs to the technical field of steel rolling. The device comprises an installation base, an air inlet, a water inlet, an annular air distribution box, an annular water distribution box, a mixing cavity, a first aerosol outlet, a second aerosol outlet, an access hole, a T-shaped bolt hole, a fixing bolt, an O-shaped sealing gasket and a protection plate. The nozzle of the aerial fog cooling ring is installed and applied to the aerial fog cooling device of the hot-rolled high-strength bar machine set in a grouping and segmenting mode, the heat exchange efficiency of the hot-rolled bar is effectively improved, the cooling speed of the hot-rolled bar is effectively controlled, the strength of the hot-rolled bar is remarkably improved, the formation of a martensite ring on the inner surface layer of the section of the bar and the generation of red rust on the surface of the martensite ring are avoided, and the precipitation of high-carbon steel carbide can be inhibited.

Description

Aerial fog cooling ring for hot rolling high-strength bar

Technical Field

The utility model belongs to the technical field of the steel rolling, in particular to an aerial fog cooling ring for hot rolling high strength rod is applicable to the cyclic annular aerial fog cooling nozzle of hot rolling rod.

Background

The hot rolled bar in China has been cooled by water through cooling and a water tank cooling method in the last 20 years, so that the strength is improved, and the problems of martensite ring, easy red rust generation on the surface, incapability of accurately controlling carbide precipitation and the like are inevitably brought to the hot rolled bar. In order to improve the cooling efficiency of the hot rolled bar, improve the strength of the bar, improve the precipitation of net-shaped and strip-shaped carbides, and effectively control the cooling speed and the quenching martensite phase transformation, a method and a device which have enough cooling capacity and cooling speed and are convenient for accurately controlling the cooling length under the condition of the finish rolling temperature (800-. The water mist cooling method is characterized in that water and gas (air or nitrogen) are mixed, the water quantity is large, the independent or grouped and segmented flexible arrangement and assembly are facilitated, the cooling speed range is wide, however, the water amount of the water mist nozzle is large in the aspect of improving the cooling efficiency, the air-water flow ratio (or the air-water ratio for short) is controlled to be 30-5, most of designed water mist cooling nozzles are single nozzles, and the atomization is realized by adopting an internal mixing cavity. Therefore, the pipeline is complicated, the design of the mixing cavity is difficult, and the actual requirement cannot be met.

The gas spray cooling nozzle is different from a water spray cooling nozzle, mainly has the advantages that the gas flow is larger than the water amount, the control range of the gas-water flow ratio (or simply the gas-water ratio) is wide, the gas-water flow ratio can be adjusted at will within 100-10, the cooling speed of the hot-rolled bar can be effectively and accurately controlled according to the CCT continuous cooling transformation curve characteristics of the bar and the requirements of controlling cooling process parameters, and the required microstructure and mechanical properties are obtained.

Disclosure of Invention

An object of the utility model is to provide an aerial fog cooling ring for hot rolling high strength rod has solved the problem that current all kinds of water smoke nozzles can not satisfy hot rolling high strength rod to high efficiency cooling function requirement. On this basis, the utility model discloses a nozzle is installed and is applied to the aerial fog cooling device of hot rolling high strength rod unit with grouping segmentation's mode in, has effectively improved the heat exchange efficiency of hot rolling rod to the cooling rate of hot rolling rod has effectively been controlled, when showing and has improved hot rolling rod intensity, has not only avoided the formation of rod cross-section inner surface layer martensite ring and the generation of surperficial red rust, also can restrain appearing of high carbon steel carbide.

The utility model comprises an installation base 1, an air inlet 2, a water inlet 3, an annular gas distribution box 4, an annular water distribution box 5, a mixing cavity 6, a first gas fog outlet 7, a second gas fog outlet 8, an access hole 9, a T-shaped bolt hole 10, a fixing bolt 11, an O-shaped sealing gasket 12 and a protection plate 13; the upper part of the mounting base 1 is provided with an air inlet 2, the air inlet 2 is connected with the annular air distribution box 4 and then enters the mixing cavity 6 through an air inlet in the mixing cavity 6, the upper part of the mounting base 1 is provided with a water inlet 3, the air inlet 3 is connected with the annular water distribution box 5 and then enters the mixing cavity 6 through a water inlet in the mixing cavity 6, and after uniform mixing, the air inlet is connected with the annular water distribution box through a first aerosol outlet 7 and a second aerosol outlet 8 which are arranged at the lower part of the mounting base; spraying at an angle of 90-30 degrees and a pressure of 0.01-0.7 MPa; the mixing chamber 6 is provided with an access hole 9, a protection plate 13 is arranged outside the mixing chamber, and the mounting base 1 is fixed on an equipment air passage and a water passage pipeline through a T-shaped bolt hole 10 by a fixing bolt 11 and an O-shaped sealing gasket 12.

The utility model discloses an aerial fog cooling ring reaches required water pressure, water yield, atmospheric pressure, tolerance within range at water supply and air feed condition, instantaneously takes place the vaporization in the high temperature region of hot rolling rod finish rolling temperature (1050 ~ 700 ℃) to take away a large amount of vaporization phase transition latent heats, make the hot rolling rod obtain efficient aerial fog cooling.

The nozzle of the aerial fog cooling ring adopts a double-superposed nozzle section of a direct-injection fan type and an oblique-injection fan type (with an angle of 90-30 degrees), so that the jet flow forms a fixed flat shape, on one hand, the vertical direct-injection fan type uniformly covers the section of the whole bar, on the other hand, the oblique-injection fan type improves the coverage length of the fan-shaped water fog along the rolling direction of the thermal state bar, not only can the attenuation and escape of the jet flow in the air caused by air-water mixed atomization be reduced, the jet flow is concentrated on the arc surface of the thermal state bar, the air-water atomized jet flow is utilized to the maximum extent, and the cooling effect is more. Thereby obtaining a good and stable rapid cooling curve of the hot rolled bar.

The access hole 9 of the aerial fog cooling ring is a spiral access hole, and the adopted spiral access hole is convenient for quick maintenance and overhaul.

The gas pressure of the gas fog cooling ring can be 0.1-0.8 MPa and the gas pressure can be 50-1000 Nm³Within the flow range, the range of the particle size distribution of the aerosol and the size of the aerosol can be flexibly adjusted to be 30 to500 mu m, so that the proportion of evaporative cooling in mixed cooling (including contact cooling, film boiling cooling and evaporative cooling) is increased to different degrees under the initial condition of the same finish rolling temperature of the hot rolled bar, thereby obtaining different heat exchange efficiencies and cooling speeds.

The nozzle of the gas spray cooling ring has a striking force of 0.8-10 kg/mm²The generation of red rust on the surface of the bar and the damage of iron scales can be well avoided, and the rusting is delayed.

Drawings

Fig. 1 is an overall outline structural view of the aerosol ring of the present invention.

Fig. 2 is a front view internal structure view of the aerosol ring of the present invention.

Fig. 3 is a left side view internal structure of the aerosol ring of the present invention.

FIG. 4 is a typical water mist particle size distribution plot for an aerosol cooling ring for hot rolled high strength rods.

Figure 5 is a graph of typical aerosol shape and size test data for the aerosol cooling ring of the present invention.

Figure 6 is the hitting power test chart of the utility model discloses a gas mist cooling ring.

In the figure, a mounting base 1, an air inlet 2, a water inlet 3, an annular air distribution box 4, an annular water distribution box 5, a mixing cavity 6, a first gas fog outlet 7, a second gas fog outlet 8, an access hole 9, a T-shaped bolt hole 10, a fixing bolt 11, an O-shaped sealing gasket 12 and a protection plate 13 are arranged.

Detailed Description

The utility model discloses an installation base 1, air inlet 2, water inlet 3, annular gas distributor box 4, annular water distributor box 5, hybrid chamber 6, aerial fog export 7, aerial fog export two 8, access hole 9, T type bolt hole 10, fixing bolt 11, O type seal gasket 12, guard plate 13. To illustrate an embodiment of the present invention of an aerosol cooling ring for hot rolling high strength rods, reference is made to fig. 1-6.

As shown in figures 1 and 2, the aerosol cooling ring for hot rolling of the high-strength rod is mainly characterized in that an air inlet 2 is formed in the upper portion of a mounting base 1 of the aerosol cooling ring, the air inlet 2 and an annular gas distribution box 4 are arranged on the upper portion of the mounting base and are connected, then the air inlet 2 and the annular gas distribution box 4 enter a mixing cavity 6 through an air inlet in the mixing cavity 6, a water inlet 3 and an annular water distribution box 5 which are arranged on the upper portion of the mounting base are connected, then the water inlet 3 and the annular water distribution box 5 enter the mixing cavity 6 through an water inlet in the mixing cavity 6. There is access hole 9 on the hybrid chamber 6, and in order to protect the access hole, the outside sets up guard plate 13, and fixing bolt 11 and O type seal gasket 12 are fixed installation base 1 to equipment gas circuit and water route pipeline through T type bolt hole 10.

As shown in FIG. 2, the first gas fog outlet of the gas fog cooling ring adopts a direct spraying fan shape, and the second gas fog outlet adopts an inclined spraying fan shape, and the gas fog outlets are sprayed out at an angle of 60 degrees and a pressure of 0.7MPa, and are specifically adjusted according to the process requirements. The jet flow forms a fixed flat shape by adopting the nozzle cross section formed by double superposition of a direct-injection fan type and an inclined-injection fan type, on one hand, the vertical direct-injection fan type uniformly covers the section of the whole bar, on the other hand, the inclined-injection fan type improves the coverage length of the fan-shaped water mist along the rolling direction of the thermal state bar, not only can the attenuation and the escape of the jet flow in the air caused by air-water mixed atomization be reduced, the jet flow is concentrated on the arc surface of the thermal state bar, the air-water atomized jet flow is utilized to the maximum extent, and the cooling effect is more uniform. Thereby obtaining a good and stable rapid cooling curve of the hot rolled bar. The spiral manhole 9 that this aerial fog ring adopted can realize quick maintenance and maintenance through blowing the dirt device.

As shown in figure 3, the gas mist cooling ring flexibly adjusts the area of the gas mist particle size distribution and the size of the gas mist within the range of water pressure, water quantity, air pressure and air quantity required by the water supply and air supply conditions, instantly vaporizes in a high-temperature area (1050-700 ℃) of the finish rolling temperature of the hot rolled bar, takes away a large amount of latent heat of vaporization phase change, and enables the hot rolled bar to obtain high-efficiency gas mist cooling.

As shown in FIGS. 3 and 4, the gas mist cooling ring can be operated at an air pressure of 0.5 to 0.7MPa and 50 to 150Nm³In the flow range, the area of the aerosol particle size distribution and the size of the aerosol are flexibly adjusted to be 38-500 mu m, so that the evaporation cooling and the mixed cooling (including contact cooling and film boiling cooling) are improved to different degrees under the initial condition of the same finish rolling temperature of the hot rolled barVaporization cooling) to obtain different heat exchange efficiencies and cooling rates.

As shown in FIG. 5, the striking force of the gas mist cooling ring is 0.8 to 1.3kg/mm²The generation of red rust on the surface of the bar and the damage of iron scales can be well avoided, and the rusting is delayed.

To sum up, the utility model discloses an aerial fog cooling ring for hot rolling high strength rod provides an annular aerial fog cooling nozzle for hot rolling rod. On the basis, the aerosol cooling ring disclosed by the invention is installed and applied to an aerosol cooling device of a hot-rolled high-strength bar machine set in a grouping and segmenting mode, so that the heat exchange efficiency of a hot-rolled bar is effectively improved, the cooling speed of the hot-rolled bar is effectively controlled, the strength of the hot-rolled bar is obviously improved, the formation of a martensite ring on the inner surface layer of the section of the bar and the generation of red rust on the surface of the martensite ring are avoided, and the precipitation of high-carbon steel carbide can be inhibited. Simultaneously the utility model discloses not only be limited to the rod, shaped steel, slab band, tubular product cooling also can refer to the utility model discloses.

Claims

1. An aerosol cooling ring for hot rolling of high-strength bars is characterized by comprising a mounting base (1), an air inlet (2), a water inlet (3), an annular gas distribution box (4), an annular water distribution box (5), a mixing cavity (6), an aerosol outlet I (7), an aerosol outlet II (8), an access hole (9), a T-shaped bolt hole (10), a fixing bolt (11), an O-shaped sealing gasket (12) and a protection plate (13); the upper part of the mounting base (1) is provided with an air inlet (2) which is connected with an annular air distribution box (4), the upper part of the mounting base (1) is provided with a water inlet (3) which is connected with an annular water distribution box (5), and the lower part of the mounting base (1) is provided with a first aerial fog outlet (7) and a second aerial fog outlet (8); there is access hole (9) on hybrid chamber (6), and the outside sets up guard plate (13), and fixing bolt (11) and O type seal gasket (12) are fixed installation base (1) to equipment gas circuit and water route pipeline through T type bolt hole (10).

2. The aerosol cooling ring for hot rolled high strength steel bars of claim 1 wherein the spray nozzles of the aerosol cooling ring have nozzle cross sections with dual overlapping of direct spray sector and oblique spray sector, the angle being 90 ° to 30 °.

3. Aerosol cooling ring for hot-rolled high-strength bars according to claim 1, characterized in that the manhole (9) is a screw-type manhole.