CN202224453U - Complete device of after-rolling ultra-fast cooling system for hot-rolled strip steel production line - Google Patents

Abstract

A post-rolling ultra-fast cooling system for hot-rolled strip production lines, a cooling device with cooling manifolds of different structures arranged in sequence along the rolling direction of the steel plate on the rolling line, a total of 2 groups, each group is provided with 8 to 10 rows of paired cooling manifolds, characterized in that flat jet flow manifolds and high-density jet flow manifolds are arranged in a row, wherein the high-density jet flow manifolds are divided into forward inclined type, vertical type, reverse inclined type and edge combined vertical inclined type, each type is used independently or combined; each manifold is perpendicular to the length direction of the rolling line and is correspondingly arranged at the upper and lower sides of the roller, the upper and lower cooling manifolds are directly connected to the high-pressure water supply pipe through the control valve group and pipeline, the control valve group can individually adjust and read the water flow of each cooling manifold water outlet, and the upper and lower cooling manifold water outlets are at various angles to the cooled strip. The setting of the utility model system is conducive to uniform cooling and water sealing of steel plates and reasonable cooling speed control and temperature accuracy control of strip steel.

Description

Complete set of post-rolling ultra-rapid cooling system for hot-rolled strip steel production line

technical field

The utility model relates to the technical field of post-rolling cooling of hot-rolled strip steel in metal processing, in particular to an ultra-fast cooling system for a hot-rolled strip steel production line. the

Background technique

The post-rolling cooling equipment for hot-rolled strip steel adopts different equipment arrangements on the output roller table to meet the different cooling speed, coiling temperature and other temperature control requirements of the strip steel, so as to cooperate with the hot rolling process to effectively control the mechanical properties of the strip steel . The post-rolling cooling process has become one of the key links in the production of hot-rolled strip steel. The capacity of the cooling device, cooling intensity, cooling speed, coiling temperature and its control accuracy all have a very important and direct impact on the quality and performance of the final product. the

At present, according to the production process of special hot-strip steel products, the hot-rolled strip is required to be rapidly cooled from 800-1000°C to a temperature of 550-750°C after rolling, and then cooled to the coiling temperature range by adopting an appropriate cooling rate. , while the current conventional process and short process production line generally adopt laminar flow cooling device for cooling after rolling. Due to its low cooling capacity, it can no longer meet the production needs of this special cooling requirement for hot-rolled strip steel. The ultra-rapid cooling technology of hot-rolled strip steel with higher cooling intensity came into being. the

Contents of the invention

The purpose of this utility model is to provide a complete set of ultra-fast cooling system after rolling for a hot-rolled strip steel production line. According to the difference between the produced product and the parameters of the rolling mill, it can meet the requirements for rapid cooling of the strip steel from 800-1000 °C to 550-550 °C after rolling. The temperature range of 750°C is required. the

A complete set of post-rolling ultra-rapid cooling system for a hot-rolled strip steel production line. The cooling nozzles are arranged in sequence along the rolling direction of the steel plate on the rolling line. It is characterized in that flat jet nozzles and high-density jet nozzles are used separately or in combination. Arrangement, there are 2 groups in total, each group has a total of 8 to 10 pairs, the upper and lower cooling nozzles are respectively arranged on the upper and lower sides of each output roller table, and are arranged in parallel. The upper and lower cooling nozzles of the ultra-fast cooling system are directly connected to the The high-pressure water supply pipes are connected, and the cooling rate can reach 300°C/s for strip steel with a thickness of 3-4mm after rolling; there are blowing devices before and after each set of cooling nozzles in this system, and there are also blowing devices on both sides of the roller table. Set up a side blowing device to remove residual water on the surface of the steel plate in time. the

The utility model has the advantages of:

1. The complete set of device of the present utility model adopts the flat jet flow nozzle and the high-density jet flow nozzle respectively or in combination, which is conducive to the realization of reasonable cooling speed control and temperature precision control of the strip steel, and is more efficient for hot-rolled strip steel after rolling. Use of cooling path control provides means. the

2. The complete set of equipment of the utility model cools the hot-rolled steel strip by using cooling water with a pressure of 0.2MPa to 1MPa, and can realize cooling within the range of 5 to 300°C/s (depending on the thickness and temperature of the steel strip). The speed is conducive to the realization of high-intensity cooling of the strip, and the control of the internal structure transformation process of the strip after rolling. the

3. When the complete device of the utility model cools the steel strip, the water jet with a certain pressure at the outlet of the cooling nozzle forms a certain angle with the steel strip to be cooled, and the water film formed during the heat exchange process on the surface of the steel plate is purged, and more Realize jet impact and nucleate boiling heat exchange, so as to realize high-strength and uniform cooling of strip steel. the

4. The upper and lower cooling nozzles of the utility model are uniformly cooled along the width of the strip, and the water flow at the outlet of each cooling nozzle can be individually adjusted through the control valve group to ensure the water volume ratio of the upper and lower cooling nozzles during the cooling process of the hot-rolled strip. Accurate control, so as to ensure the straightness of the cooled strip along the length direction. the

5. During the working process of the cooling device, through the front air blowing device, side water spraying device and rear air blowing device, the residual water remaining on the surface of the steel plate can be swept away along the width of the steel plate, thereby improving the cooling efficiency of the steel plate surface and reducing the residual water on the steel plate due to retained water. The uneven cooling produced by the boiling process on the surface. The front air blowing device, side water spraying device, and rear air blowing device sweep away residual water on the surface of the steel plate and are also conducive to the parameter measurement of the steel plate surface by the detection instrument installed in the front and rear of the cooling device or in the cooling device. the

Description of drawings

Figure 1 is a schematic diagram of the layout of the complete set of devices of the present invention along the running direction of the rolling production line;

Figure 2 is a schematic diagram of water supply to the upper and lower cooling nozzles of the complete cooling device. the

Detailed ways

A complete set of post-rolling ultra-rapid cooling system for a hot-rolled strip steel production line. The cooling nozzles are arranged in sequence along the rolling direction of the steel plate on the rolling line. It is characterized in that flat jet nozzles and high-density jet nozzles are used separately or in combination. Layout, see Figure 1: There are 2 groups of cooling nozzles in this complete set of equipment, each group is equipped with 8 to 10 upper cooling nozzles and an equal number of lower cooling nozzles, and the first group adopts a combination of flat jet nozzles and high-density jet nozzles. , The second group adopts high-density jet stream nozzles to be arranged separately, and can be arranged in any combination of flat jet stream nozzles and high-density jet stream nozzles according to cooling needs. The upper and lower cooling nozzles of this complete set of ultra-fast cooling system are directly connected to the high-pressure water supply pipe, and the upper cooling nozzle and the lower cooling nozzle are respectively arranged above and below each roller table in parallel. The water spray angles α and β when the high-density jet nozzle cools the steel plate, α is the water spray angle of the upper high-density jet nozzle, and β is the water spray angle of the lower high-density jet nozzle: upper height The spraying angles of the density jet stream nozzle 1 and the lower high-density jet stream nozzle 7 are 90°<α<135°, 90°<β<135° respectively; the upper high-density jet stream nozzle 3 and the lower high-density jet stream nozzle 9. The water spray outlet angles are respectively α=90°, β=90°; the upper high-density jet stream nozzle 5 and the lower high-density jet stream nozzle 10 spray water outlet angle sides are α=90°, β=90° , the middle is 90°<α<135°, 90°<β<135°; the water spray angle of the lower high-density jet flow nozzle 11 is 45°<α<90°. the

The upper and lower cooling nozzles are directly connected to the high-pressure water supply pipe 12, as shown in Figure 2, the water flow at the outlet of each cooling nozzle can be adjusted individually through the control valve group 13, so as to ensure that the upper and lower cooling nozzles during the cooling process of the hot-rolled strip steel Accurate control of the water volume ratio ensures that the cooled strip is straight along the length. The front and rear of each set of ultra-rapid cooling complete equipment are equipped with a purge device 14, and side blowing devices 15 are also installed on both sides of the roller table to remove residual water on the surface of the steel plate in time; the purge and side blowing medium is 1.0-1.2 MPa water medium or 0.4 ~ 0.6Mpa compressed air medium. the

Claims (5)

1. a hot-rolled strip production line is with the complexes that roll the supper-fast cooling system in back; The steel plate rolling traffic direction is arranged in order cooling jet in the rolling line upper edge: flat injection flow nozzle and high density jet nozzle; It is characterized in that supper-fast cooling system adopts flat injection flow nozzle and high density jet nozzle difference or combined and arranged, establish 2 groups altogether, establish 8～10 pairs altogether for every group; The corresponding respectively upper and lower that is arranged in every runout table of upper and lower cooling jet; Laterally arrange, for the band steel that rolls back 3～4mm thickness, the cooling velocity of supper-fast cooling system can reach 300 ℃/s; Every group of cooling jet of native system is forward and backward all to be furnished with blow device, and the roller-way both sides also are provided with the side-blown device, in time removes the residual water of surface of steel plate.

2. the complexes that roll the supper-fast cooling system in back according to claim 1 is characterized in that the layout of cooling jet can adopt the flat injection flow nozzle separately, or adopt the high density jet nozzle separately, or the combination of 2 kinds of nozzles.

3. the complexes that roll the supper-fast cooling system in back according to claim 1; It is characterized in that water spray when the high density jet nozzle is cooled off steel plate effluent angle [alpha] and β; α is the last high density jet nozzle water spray angle of effluenting; β is the following high density jet nozzle water spray angle of effluenting: go up the spray water angle of effluenting of high density jet nozzle (1) and following high density jet nozzle (7) and be respectively 90 °＜α＜135 °, 90 °＜β＜135 °; Last high density jet nozzle (3) and following high density injection stream (9) the water spray angle of effluenting is respectively α=90 °, β=90 °; Last high density jet nozzle (5) and following high density jet nozzle (10) the water spray angle limit portion of effluenting is α=90 °, and β=90 °, centre are 90 °＜α＜135 °, 90 °＜β＜135 °; Following high density jet nozzle (11) the water spray angle of effluenting is 45 °＜α＜90 °.

4. the complexes that roll the supper-fast cooling system in back according to claim 1 is characterized in that upper and lower cooling jet links to each other with high-pressure water pipe, and cooling water pressure is 0.2～1.0MPa.

5. the complexes that roll the supper-fast cooling system in back according to claim 1; The forward and backward blow device (14) that all is furnished with of every group of collector that it is characterized in that native system; And the roller-way both sides also are provided with side-blown device (15), in time remove the residual water of surface of steel plate; The medium that purges, blows side is 1.0～1.2MPa aqueous medium or 0.4～0.6Mpa compressed air medium.

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