Cooling system for heat treatment of metal continuous strip

Abstract

A cooling system for heat treatment of continuous metal strip includes a closed steel structure shell, an air supply unit, and an exhaust unit. The air supply unit and the exhaust unit form a unidirectional exhaust structure, which allows cold air to be introduced into the steel structure shell as the continuous metal strip travels, and the heat-exchanged hot air to be discharged from the steel structure shell and away from the working area where the steel structure shell is located. This invention allows the continuous metal strip to exchange heat with the air within a relatively closed steel structure shell. The heat-exchanged hot air is then led out of the working area by a fan, preventing direct discharge of hot air into the vicinity of the heat treatment equipment and thus avoiding environmental impact on the working area. Furthermore, the operating heat load generated by the exhaust fan is also directly discharged out of the working area along with the hot air, significantly improving the heat exchange effect and the cooling effect of the continuous metal strip.

Description

Technical Field

[0001] This invention belongs to the technical field of heat treatment equipment for continuous metal strips, and in particular relates to a cooling system for heat treatment of continuous metal strips. Background Technology

[0002] In the continuous heat treatment process of continuous metal strip, the continuous metal strip is coated by a coating machine and then dried in a drying furnace, and then heated and cured in a sintering furnace. After that, the continuous metal strip needs to be cooled down.

[0003] In existing technologies, continuous metal strips are often cooled using direct spraying. This means the cooling system mainly consists of three parts: an open steel structure, an air duct, and a blower unit. Specifically, the continuous metal strip travels on conveyor rollers of a steel structure connected to the atmosphere. During cooling, the blower directly forces air from the surrounding environment into the air duct. The air is then sprayed along the air duct through spray slots or nozzles onto the surface of the continuous metal strip for cooling. The heated air is then discharged directly into the workshop from the open parts of the steel structure. This rapid airflow quickly spreads within the workshop, causing a rapid increase in the working environment temperature, which directly leads to the following problems:

[0004] (1) Low cooling efficiency of continuous metal strip. In existing cooling methods, only the air duct is sealed. Due to its open steel structure, the continuous metal strip is directly exposed to the workshop environment, and the hot air after heat exchange is also directly discharged into the workshop environment, causing the workshop environment temperature to rise continuously. The air used for cooling in this method is also directly drawn from the workshop environment, so the convective heat transfer temperature difference during the air jet process becomes smaller and smaller, resulting in low heat transfer efficiency. In addition, as the power source for forced convection heat transfer air, the heat load generated by the fan during operation will also enter the cooling device through the air duct, increasing the overall cooling load and reducing the cooling efficiency.

[0005] (2) The working environment for workers is harsh. The hot air after heat exchange is directly discharged into the working area of ​​the factory workshop, which raises the air temperature around the cooling device. The noise generated by the continuous disturbance of the large air volume is also very high, which greatly reduces the comfort level of workers. Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a cooling system for heat treatment of continuous metal strip, which solves the technical problem in the prior art that the cooling efficiency of continuous metal strip is low and the working environment temperature is high due to unreasonable cooling system design.

[0007] To solve at least one of the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A cooling system for heat treatment of continuous metal strip includes a closed steel structure shell, an air supply unit and an exhaust unit. The air supply unit and the exhaust unit form a unidirectional exhaust structure, which can introduce cold air into the steel structure shell when the continuous metal strip is moving in the steel structure shell, and then exhaust the heat-exchanged hot air from the steel structure shell away from the working area where the steel structure shell is located.

[0009] Furthermore, the air supply unit and the air exhaust unit are driven by the same induced draft fan, which is located outside the working area where the steel structure shell is located.

[0010] Furthermore, the air supply unit is placed on the steel structure shell and includes several nozzles, which are connected to the induced draft fan through pipes to spray cold air onto the continuous metal strip.

[0011] Furthermore, the nozzle is located at the top of the steel structure housing and below the conveying roller located inside the steel structure housing.

[0012] Furthermore, the nozzles are arranged side by side along the transport direction of the continuous metal strip.

[0013] Furthermore, the nozzles in adjacent rows are staggered.

[0014] Furthermore, the exhaust unit also includes an air box, wherein the air box is disposed below the steel structure shell and is interconnected with the steel structure shell;

[0015] The air box is connected to the induced draft fan.

[0016] Furthermore, several return air ducts are provided on the bottom surface of the steel structure shell. One end of the return air duct is connected to the steel structure shell, and the other end is connected to the air box. The return air ducts are located on both sides of the width of the continuous metal strip.

[0017] Furthermore, the exhaust unit also includes a connecting pipe, one end of which is connected to the output port of the air box, and the other end of which is connected to the input port of the induced draft fan.

[0018] Furthermore, an exhaust pipe is provided at the output end of the induced draft fan, and the outlet of the exhaust pipe is vertically inclined upward.

[0019] Compared with existing technologies, this invention includes a steel structure shell, an air supply unit, and an exhaust unit. The air supply unit and exhaust unit form a unidirectional exhaust structure. When the continuous metal strip travels within the steel structure shell, cold air is drawn into the shell through nozzles, allowing the continuous metal strip to exchange heat with the air within the relatively enclosed shell. The heated air is then drawn out by a fan and discharged outside the working area, preventing direct discharge of hot air into the vicinity of the heat treatment equipment and thus avoiding environmental impact on the working area. Furthermore, the operating heat load generated by the exhaust fan is also directly discharged outside the workshop along with the hot air, significantly improving the heat exchange effect and the cooling effect of the continuous metal strip. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a cooling system for heat treatment of continuous metal strip according to an embodiment of the present invention;

[0021] Figure 2 This is a top view of a cooling system for heat treatment of a continuous metal strip according to an embodiment of the present invention.

[0022] In the picture:

[0023] 10. Steel structure shell; 11. Conveyor rollers; 20. Continuous metal strip.

[0024] 30. Air supply unit; 31. Nozzle; 40. Exhaust unit

[0025] 41. Air box; 42. Exhaust fan; 43. Return air duct

[0026] 44. Connecting pipe; 45. Exhaust pipe; 50. Working area Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] This embodiment proposes a cooling system for heat treatment of continuous metal strips, such as... Figure 1As shown, the structure includes a closed steel structure shell 10, an air supply unit 30, and an exhaust unit 40. The continuous metal strip 20 is laid out horizontally on conveyor rollers 11 inside the steel structure shell 10. Several conveyor rollers 11 arranged side by side are set along the width direction of the steel structure shell 10. The conveyor rollers 11 are driven to rotate, thereby driving the continuous metal strip 20 to move horizontally. In this embodiment, the steel structure shell 10 is a closed structure and forms a one-way exhaust structure with the air supply unit 30 and the exhaust unit 40. This allows cold air to be introduced into the steel structure shell 10 when the continuous metal strip 20 moves inside the steel structure shell 10, and the heat exchanged hot air is discharged from the steel structure shell 10 and away from the working area 50 where the steel structure shell 10 is located, i.e., discharged outside the workshop. The cooling system does not directly discharge hot air around the heat treatment equipment, thus not affecting the environment of the working area 50. Moreover, the operating heat load generated by the exhaust fan 42 in the exhaust unit 40 is also directly discharged outside the workshop along with the hot airflow, which greatly improves the heat exchange effect and the cooling effect of the continuous metal strip.

[0029] Specifically, the air supply unit 30 and the exhaust unit 40 are driven by the same induced draft fan 42, which is located outside the working area 50 where the steel structure shell 10 is located, that is, outside the workshop where the heat treatment equipment is located.

[0030] Furthermore, the air supply unit 30 is placed on the steel structure housing 10 and includes several nozzles 31. The nozzles 31 are connected to the induced draft fan 42 via pipes to spray cold air onto the continuous metal strip 20. The nozzles 31 are located at the top of the steel structure housing 10 and below the conveying rollers 11 located inside the steel structure housing 10. The conveying rollers 11 have a structure in which they are spaced apart and arranged side by side. The nozzles 31 located below the conveying rollers 11 can spray cold air onto the continuous metal strip 20 through the gaps, thereby completing the cooling of the stepping continuous metal strip 20.

[0031] from Figure 2 It is known that the nozzles 31 are arranged side by side along the conveying direction of the continuous metal strip 20. Preferably, the nozzles 31 in two adjacent rows are staggered, and all the nozzles 31 are arranged closely on the cavity of the steel structure shell 10. The staggered structure can completely cover the width area of ​​the continuous metal strip 20 to ensure that the continuous metal strip 20 can be cooled by uniform airflow, so as to ensure the consistency of the heat treatment of the continuous metal strip 20.

[0032] Furthermore, the exhaust unit 40 also includes an air box 41, which is disposed below the steel structure shell 10 and interconnected with it. The air box 41 and the steel structure shell 10 are installed together on the same heat treatment equipment. The induced draft fan 42 is located outside the working area 50 where the steel structure shell 10 is located, and both the air box 41 and the induced draft fan 42 are connected to the induced draft fan 42.

[0033] Furthermore, several return air ducts 43 are provided on the bottom surface of the steel structure shell 10. One end of the return air duct 43 is connected to the steel structure shell 10, and the other end is connected to the air box 41. The return air ducts 43 are located on both sides of the width direction of the continuous metal strip 20. They are not only staggered with the nozzle 31, but also fully absorb the hot airflow after heat exchange. At the same time, the diameter of the return air duct 43 is larger than the diameter of the nozzle 31.

[0034] Furthermore, the exhaust unit 40 also includes a connecting pipe 44, one end of which is connected to the output port of the air box 41, and the other end of which is connected to the input port of the induced draft fan 42.

[0035] Furthermore, in order to prevent the exhaust hot airflow from causing heat radiation to the working area 50 where the heat treatment equipment is located, an exhaust pipe 45 is provided at the output end of the exhaust fan 42. The outlet of the exhaust pipe 45 is set vertically and obliquely upward, and is far away from the working area 50 where the heat treatment equipment is located.

[0036] The continuous metal strip 20 mentioned in this invention includes, but is not limited to, steel strip components.

[0037] During operation, the induced draft fan 42 drives the continuous metal strip 20, which is placed on the conveyor roller 11 inside the steel structure shell 10, to spray cold air through the nozzle 31. The cold air exchanges heat with the surface of the continuous metal strip 20 and the high temperature of the continuous metal strip 20 to form a hot airflow. The hot airflow enters the air box 41 through the return air pipe 43, and then enters the induced draft fan 42 through the connecting pipe 44. The induced draft fan 42 then discharges the hot airflow outside the working area 50 where the steel structure shell 10 is located through the exhaust pipe 45.

[0038] This invention includes a steel structure shell, an air supply unit, and an exhaust unit. The air supply and exhaust units form a unidirectional exhaust structure. When the continuous metal strip travels within the steel structure shell, cool air is drawn in through nozzles, allowing the continuous metal strip to exchange heat with the air within the relatively enclosed shell. The heated air is then drawn out by a fan and discharged outside the working area, preventing direct discharge of hot air into the surrounding environment and thus avoiding any impact on the working area. Furthermore, the operating heat load generated by the exhaust fan is also directly discharged outside the workshop along with the heated air, significantly improving the heat exchange effect and the cooling effect of the continuous metal strip. Moreover, the cooling device in this structure uses negative pressure heat exchange, which does not affect the surrounding environment and improves the comfort of the working environment.

[0039] The embodiments of the present invention have been described in detail above. These descriptions are merely preferred embodiments and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A cooling system for heat treatment of continuous metal strip, characterized in that, It includes a closed steel structure shell, as well as an air supply unit and an exhaust unit. The air supply unit and the exhaust unit form a one-way exhaust structure, which can introduce cold air into the steel structure shell when the continuous metal strip is moving in the steel structure shell, and then exhaust the heat exchanged hot air from the steel structure shell and away from the working area where the steel structure shell is located. The air supply unit and the air exhaust unit are driven by the same induced draft fan, which is located outside the working area where the steel structure shell is located. The air supply unit is placed on the steel structure shell and includes several nozzles. The nozzles are connected to the induced draft fan through pipes to spray cold air onto the continuous metal strip. The nozzle is located at the top of the steel structure housing and below the conveying roller located inside the steel structure housing; The nozzles are arranged side by side along the transport direction of the continuous metal strip; The exhaust unit also includes a wind box, wherein the wind box is disposed below the steel structure shell and interconnected with the steel structure shell, and the wind box is connected to the induced draft fan; The bottom surface of the steel structure shell is also provided with several return air pipes. One end of the return air pipe is connected to the steel structure shell, and the other end is connected to the air box. The return air pipes are located on both sides of the width of the continuous metal strip.

2. The cooling system for heat treatment of continuous metal strip according to claim 1, characterized in that, The nozzles in the two adjacent rows are staggered.

3. The cooling system for heat treatment of continuous metal strip according to claim 1, characterized in that, The exhaust unit also includes a connecting pipe, one end of which is connected to the output port of the air box, and the other end of which is connected to the input port of the induced draft fan.

4. A cooling system for heat treatment of continuous metal strip according to claim 3, characterized in that, An exhaust pipe is provided at the output end of the induced draft fan, and the outlet of the exhaust pipe is set vertically and obliquely upward.

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