Device for purging residual cooling water after quenching and cooling of steel plate

Abstract

The utility model relates to a residual cooling water purging device after quenching and cooling of a steel plate, and belongs to the technical field of quenching and cooling of steel plates in metallurgical industry. According to the technical scheme, a plurality of nozzles (7) are respectively arranged above and below a steel plate conveying roller way (3) behind a quenching machine (2), the plurality of nozzles (7) are respectively connected with a flue gas conveying pipeline (6), and the flue gas conveying pipeline (6) is connected with a high-temperature flue gas outlet of a heat treatment furnace (1); the spraying direction of the nozzles (7) above the steel plate conveying roller way (3) faces the upper surface of the steel plate, and the spraying direction of the nozzles (7) below the steel plate conveying roller way (3) faces the lower surface of the steel plate. The device has the beneficial effects that residual cooling water on the surface of the quenched steel plate is quickly purged by high-temperature flue gas in the heat treatment furnace, so that the steel plate is prevented from being rusted, and the surface quality of the steel plate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of residual cooling water blowing devices after steel plate quenching and cooling, belong to metallurgical industry steel plate quenching and cooling technical field. BACKGROUND

[0002] Steel quenching is the heat treatment process that steel is heated to critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel) above temperature, keeps warm for a period of time, makes it all or part austenitizing, then with the cooling rate greater than critical cooling rate fast cooling to Ms below (or Ms near isothermal) and carries out martensite (or bainite) transformation. But there is much cooling water on the surface of steel plate after quenching and cooling, and a layer of rust will be generated on the surface of steel plate after 5-10 minutes of cooling water, which seriously affects the surface quality of steel plate. Therefore, how to solve the problem of rust on the surface of steel plate after quenching is a technical problem to be solved in the field. SUMMARY

[0003] The utility model aims at providing a kind of residual cooling water blowing devices after steel plate quenching and cooling, utilize high-temperature flue gas in heat treatment furnace to blow residual cooling water on the surface of steel plate, make the surface of steel plate dry quickly, prevent corrosion, solve the problems in the background art.

[0004] The technical scheme of the utility model is:

[0005] A kind of residual cooling water blowing device after steel plate quenching and cooling, comprising heat treatment furnace, quenching machine and roller way, the upper and lower of steel plate conveying roller way behind quenching machine are respectively provided with several nozzles, several nozzles are respectively connected with flue gas conveying pipeline, flue gas conveying pipeline is connected with the high-temperature flue gas outlet of heat treatment furnace.

[0006] The blowing direction of the nozzle above the steel plate conveying roller way is towards the upper surface of steel plate, and the blowing direction of the nozzle below the steel plate conveying roller way is towards the lower surface of steel plate.

[0007] The nozzles above and below the steel plate conveying roller way are arranged in a box.

[0008] The two sides of the box are respectively provided with inlet and outlet matched with steel plate.

[0009] The bottom of the box is provided with drain.

[0010] The flue gas conveying pipeline is provided with valve.

[0011] The utility model has the beneficial effects that high-temperature flue gas in heat treatment furnace is used to quickly blow residual cooling water on the surface of steel plate after quenching, prevent steel plate from rusting, and improve the surface quality of steel plate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1The front view of the utility model;

[0013] In the figure: heat treatment furnace 1, quenching machine 2, roller way 3, box 4, valve 5, flue gas conveying pipeline 6, nozzle 7, steel plate 8. DETAILED DESCRIPTION

[0014] The utility model will be further explained by examples in connection with the drawings.

[0015] Refer to the drawings Figure 1 A kind of steel plate quenching cooling residual cooling water blowing device, containing heat treatment furnace 1, quenching machine 2 and roller way 3, the upper and lower of steel plate conveying roller way 3 behind quenching machine 2 are respectively equipped with several nozzles 7, several nozzles 7 are respectively connected with flue gas conveying pipeline 6, flue gas conveying pipeline 6 is connected with the high-temperature flue gas outlet of heat treatment furnace 1.

[0016] In the embodiment, refer to the drawings Figure 1 The blowing direction of nozzle 7 above steel plate conveying roller way 3 is towards the upper surface of steel plate, and the blowing direction of nozzle 7 below steel plate conveying roller way 3 is towards the lower surface of steel plate.Nozzle 7 above and below steel plate conveying roller way 3 is arranged in a box 4, and the box 4 is a common rectangular box, and the box 4 is provided with inlet and outlet matched with steel plate on two sides respectively, and the bottom of the box 4 is provided with drain hole.Valve 5 is installed on flue gas conveying pipeline 6 to control flue gas conveying.

[0017] Steel plate 3 is heated in heat treatment furnace 1 first, and the heating temperature is 870-920 DEG C, so that it is fully austenitized, then is conveyed to quenching machine 2 through roller way to quench, and is cooled to normal temperature, then is conveyed to box 4 through roller way, valve 5 is opened, and the pressure difference between heat treatment furnace 1 and box 4 is utilized, high-temperature flue gas in heat treatment furnace 1 is blown to the surface of steel plate through flue gas conveying pipeline 6 and nozzle 7 to blow residual cooling water on the surface of steel plate, so that the surface of steel plate is rapidly dried, and rust is prevented.

Claims

1. A residual cooling water blowing device after quenching cooling of a steel plate, comprising a heat treatment furnace (1), a quenching machine (2) and a roller table (3), characterized in that: A plurality of nozzles (7) are arranged above and below the steel plate conveying roller (3) behind the quenching machine (2), the nozzles (7) are connected with flue gas conveying pipes (6), and the flue gas conveying pipes (6) are connected with the high-temperature flue gas outlet of the heat treatment furnace (1).

2. The residual quench water purging device for a steel plate after quenching and cooling according to claim 1, characterized in that: The blowing direction of the nozzles (7) above the steel plate conveying roller (3) is towards the upper surface of the steel plate, and the blowing direction of the nozzles (7) below the steel plate conveying roller (3) is towards the lower surface of the steel plate.

3. The residual quench water purging device for a steel plate after quenching and cooling according to claim 2, characterized in that: The nozzles (7) above and below the steel plate conveying roller (3) are arranged in a box (4).

4. The quenching cooling residual water purging device for a steel plate according to claim 3, characterized by: The two sides of the box (4) are respectively provided with an inlet and an outlet matched with the steel plate.

5. The quenching cooling residual water purging device for a steel plate according to claim 4, characterized by: The bottom of the box (4) is provided with a drain port.

6. The residual quench water purging device for a steel plate after quenching and cooling according to claim 1, characterized in that: The flue gas conveying pipes (6) are provided with valves (5).

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