A segment of a slab caster on-line quenching device

Abstract

The application discloses a slab continuous casting machine sector segment on-line quenching device and relates to the technical field of steelmaking continuous casting. The device efficiently utilizes the cooling efficiency of cooling water by forming forced convection physical phenomenon between the quenching cooling water and the slab surface, effectively reduces the slab surface temperature, and solves the technical problem of the adverse effect of slab hot charging cracks on hot charging temperature, hot charging proportion and hot charging efficiency in the related art. The device comprises at least one group of groove plates, each group of groove plates comprises two groove plates arranged oppositely, the two groove plates of each group are clamped to form a channel, the channel is used for passing the slab through the last sector segment of the slab continuous casting machine, each groove plate is provided with a cooling water groove, the length direction of the cooling water groove is arranged along the width direction of the slab, the circumferential side opening of the cooling water groove is arranged towards the other groove plate, and the length side opening of the cooling water groove is configured to be connected with cooling water, so that the cooling water flows through the surface of the slab.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steelmaking continuous casting, and particularly relates to a slab continuous casting machine sector on-line quenching device. BACKGROUND

[0002] Slab hot charging refers to the behavior of sending the slab into the heating furnace when the temperature is not lower than 200 DEG C. However, the biggest problem limiting the hot charging ratio and the hot charging efficiency is the red sending crack, also known as the hot charging crack. In the production practice, it is found that when the slab surface temperature is higher than 600 DEG C and the hot charging is carried out into the heating furnace, the surface claw crack defect is prone to occur after rolling. Therefore, it is urgent to improve the hot charging crack. SUMMARY

[0003] The present application provides a slab continuous casting machine sector on-line quenching device, which efficiently utilizes the cooling efficiency of the quenching cooling water and the surface of the slab to form a forced convection physical phenomenon, effectively reduces the surface temperature of the slab, and solves the technical problem of the adverse effect of the hot charging crack of the slab hot charging in the related art on the hot charging temperature, the hot charging ratio and the hot charging efficiency.

[0004] The present application provides a slab continuous casting machine sector on-line quenching device, which includes at least one set of groove plates, each set of groove plates includes two groove plates arranged oppositely, the two groove plates of each set are clamped to form a channel, the channel is used for passing the slab after the last sector of the slab continuous casting machine, each groove plate is provided with a cooling water groove, the length direction of the cooling water groove is arranged along the width direction of the slab, the opening of the circumferential side of the cooling water groove is arranged towards the other groove plate, and the opening of one side of the length of the cooling water groove is configured to pass the cooling water so that the cooling water flows through the surface of the slab.

[0005] Optionally, the slab continuous casting machine sector on-line quenching device further includes at least two supports, the two supports are respectively connected with the two groove plates of the same set, one end of the support is connected to the side of the groove plate away from the other groove plate, and the other end of the support is fixedly arranged relative to the slab continuous casting machine.

[0006] Optionally, the support arranged in the vertical direction is configured to be adjustable in length so that the distance between the slab and the groove plate is within a preset gap when the slab passes through the channel.

[0007] Optionally, the slab continuous casting machine sector on-line quenching device further includes at least two distribution water tanks, the two distribution water tanks are respectively installed on one side of the length of the two groove plates of the same set, the distribution water tank is in communication with the opening of one side of the length of the cooling water groove, and the distribution water tank is configured to pass the cooling water so that the opening of one side of the length of the cooling water groove is configured to pass the cooling water.

[0008] Optionally, the groove plate is further provided with two water blocking grooves, the distribution direction of the water blocking groove is the same as that of the cooling water groove, and the two water blocking grooves are respectively located on the opposite sides of the cooling water groove of the groove plate.

[0009] The water blocking groove is provided with a water blocking plate, the water blocking plate is arranged vertically, vertical sides of the water blocking plate are arranged apart from groove walls of the water blocking groove in the groove plate, a side of the water blocking plate away from the channel is fixedly connected with the groove plate, and the water blocking plate is provided with a water passing opening.

[0010] Optionally, the groove plate further comprises a vertical baffle arranged at an opposite side opening to a side opening through which cooling water enters.

[0011] Optionally, the slab continuous casting machine sector segment on-line quenching device further comprises a cooling water source, the cooling water source is injected into the distribution water tank through a water pump, and the water pump is configured to control and adjust the pressure and flow of the cooling water flowing in the cooling water groove according to the actual surface temperature reduction rate of the cast slab, so that the surface temperature reduction rate of the cast slab reaches a preset rate.

[0012] Optionally, the groove plate is provided with at least two cooling water grooves parallel to each other.

[0013] Optionally, the water flow directions of the cooling water grooves in the two groove plates belonging to the same group are opposite.

[0014] Optionally, the slab continuous casting machine sector segment on-line quenching device is provided with at least two groups of groove plates, the cast slab sequentially passes through the channels formed by each group of groove plates, and the water flow directions of the cooling water grooves of the adjacent two groove plates located on the same side of the channel are opposite.

[0015] The present application has the following advantages: the present application provides a slab continuous casting machine sector segment on-line quenching device, a group of groove plates are formed by arranging one groove plate on the lower surface of the cast slab and another groove plate on the upper surface of the cast slab, the groove plates are installed behind the last sector segment of the slab continuous casting machine, and the two groove plates of each group form a channel for the cast slab to pass through; the groove plate is provided with a cooling water groove, the length direction of the cooling water groove is arranged along the width direction of the cast slab, the circumferential side opening of the cooling water groove is arranged towards the other groove plate, and the length side opening of the cooling water groove is configured to enter cooling water, so that the cooling water flows through the surface of the cast slab; the present application forms flat surface cooling by making the quenching cooling water slide on the surface of the cast slab in the width direction of the cast slab, directly cools and quenches the surface of the quenched cast slab, increases the contact time of the cooling water and the surface of the cast slab, forms forced convection physical phenomenon between the quenching cooling water and the surface of the cast slab, efficiently utilizes the cooling capacity of the cooling water, effectively reduces the surface temperature of the cast slab, saves power energy, improves the low cooling water use efficiency during the quenching of the sector segment, solves the low cooling rate of the surface of the cast slab, and further controls the cooling time due to the forced convection cooling of the surface of the cast slab, so that the temperature change of the core of the cast slab is small, which is beneficial to the subsequent processing process of the cast slab. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments.

[0017] Figure 1 A slab continuous casting machine sector segment on-line quenching device provided by the present application is shown in a cross-sectional view in the drawing speed direction.

[0018] Figure 2 A slab continuous casting machine sector segment on-line quenching device provided by the present application is shown in a cross-sectional view in the slab width direction.

[0019] Figure 3 A specific implementation diagram of a slab continuous casting machine sector segment on-line quenching device provided by the present application is shown.

[0020] The drawing shows: 1-cooling water source, 2-distribution water tank, 3-slot plate, 31-cooling water channel, 32-water blocking channel, 33-vertical baffle, 4-bracket, 5-water blocking plate, 6-cast slab, 61-drawing speed direction. DETAILED DESCRIPTION

[0021] The embodiment of the present application provides a slab continuous casting machine sector segment on-line quenching device, which forms a forced convection physical phenomenon between quenching cooling water and a cast slab surface to efficiently utilize the cooling efficiency of the cooling water, effectively reduces the cast slab surface temperature, and solves the technical problem of the adverse effect of hot charging cracks in hot charging of a slab on hot charging temperature, hot charging proportion and hot charging efficiency in the related art.

[0022] The technical solution in the embodiment of the present application is as follows to solve the above technical problem:

[0023] A slab continuous casting machine sector segment on-line quenching device comprises at least one set of slot plates, each set of slot plates comprises two slot plates arranged oppositely, the two slot plates in each set are clamped to form a channel, the channel is used for passing a cast slab after passing through the last sector segment of a slab continuous casting machine, each slot plate is provided with a cooling water channel, the length direction of the cooling water channel is arranged along the width direction of the cast slab, the opening of the peripheral side of the cooling water channel is arranged to face the other slot plate, and the opening of one side of the length of the cooling water channel is configured to be connected to cooling water, so that the cooling water flows through the surface of the cast slab.

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail in combination with the drawings in the specification and specific embodiments.

[0025] Please refer to Figures 1 to 3The embodiment discloses a slab continuous casting machine sector segment on-line quenching device, which comprises at least one set of groove plates 3, each set of groove plates 3 comprises two groove plates 3 arranged oppositely, the two groove plates 3 of each set are clamped to form a channel, the channel is passed through by the cast slab 6 after passing through the last sector segment of the slab continuous casting machine, and each groove plate 3 is provided with a cooling water groove 31. The length direction of the cooling water groove 31 is arranged along the width direction of the slab, the circumferential side opening of the cooling water groove 31 is arranged towards the other groove plate 3, and the length side opening of the cooling water groove 31 is configured to be connected to cooling water, so that the cooling water flows through the surface of the cast slab 6.

[0026] Specifically, one groove plate 3 is arranged on the lower surface of the cast slab 6, and the other groove plate 3 is arranged on the upper surface, so that the set of groove plates 3 is installed behind the last sector segment of the slab continuous casting machine, and the two groove plates 3 of each set form a channel for the cast slab 6 to pass through. In detail, the application is applied behind the last sector segment of the slab continuous casting machine, at this time, the surface temperature of the cast slab 6 is reduced to between 800 DEG C and 900 DEG C, and the quenching cooling of the surface of the cast slab 6 is facilitated.

[0027] Each groove plate 3 is provided with a cooling water groove 31, as shown in the drawings, the length direction of the cooling water groove 31 is arranged along the width direction of the slab, as shown in the drawings, the circumferential side opening of the cooling water groove 31 is arranged towards the other groove plate 3, that is, the circumferential side openings of the cooling water grooves 31 of the two groove plates 3 belonging to the same set are arranged oppositely, so that the cooling water flowing in the grooves respectively flows through the upper and lower surfaces of the cast slab 6, as shown in the drawings, the length side opening of the cooling water groove 31 is configured to be connected to cooling water, so that the cooling water flows through the surface of the cast slab 6. Figure 2 Figure 1 Figure 2 Figure 3

[0028] In detail, the quenching cooling water is slid on the surface of the cast slab 6 in the width direction by the above-mentioned device, a flat surface cooling is formed, the surface of the quenched cast slab 6 is directly cooled and quenched by the flat surface, the contact time of the cooling water and the surface of the cast slab 6 is increased, the time and space of heat exchange are increased, a forced convection physical phenomenon is formed between the quenching cooling water and the surface of the cast slab 6, the cooling capacity of the cooling water is efficiently utilized, the surface temperature of the cast slab 6 is effectively reduced, power energy is saved, the problem of low cooling water use efficiency during quenching of the sector segment is solved, and the problem of low cooling rate of the slab surface is solved.

[0029] In addition, since the cast slab 6 is forcedly cooled, the cooling time is controlled, the temperature change of the core of the cast slab 6 is small, and the subsequent processing process of the cast slab 6 is facilitated.

[0030] Optionally, please refer to Figure 1 and Figure 3 ​​​​Each groove plate 3 is provided with at least two cooling water channels 31 which are parallel to each other. It can be understood that the number of cooling water channels 31 can be one, two, or more, such as Figure 1 and Figure 3 The groove plate 3 is shown in the form of three cooling water channels 31.

[0031] When the groove plate 3 has three cooling water channels 31, it is beneficial for the processing of the groove plate 3, and the roughness and flatness of the surface of the groove plate 3 corresponding to the casting blank 6 can be specifically controlled, which better forms a convection heat exchange channel with the surface of the quenched casting blank 6, and also leaves a space distance for the online quenching device of the slab continuous casting machine segment.

[0032] Alternatively, the water flow directions of the cooling water channels 31 of the two groove plates 3 belonging to the same group are opposite, as shown in Figure 1 The water flow direction of the cooling water channel 31 in the upper half of the groove plate 3 is perpendicular to the paper and inward, and the water flow direction of the cooling water channel 31 in the lower half is perpendicular to the paper and outward. By setting the water flow directions of the cooling water channels 31 in the opposite directions, the cooling uniformity of the upper and lower surfaces of the casting blank 6 can be improved.

[0033] Alternatively, as shown in Figure 3 The online quenching device of the slab continuous casting machine segment is provided with at least two groups of groove plates 3, the casting blank 6 passes through the passages formed by each group of groove plates 3 in sequence, and the water flow directions of the cooling water channels 31 of the adjacent two groove plates 3 located on the same side of the passage are opposite, thereby further effectively compensating for the uneven cooling and quenching of the surface of the casting blank 6.

[0034] Here, the beneficial effects of the groove plate 3 having three cooling water channels 31 are supplemented: when the number of cooling water channels 31 of the groove plate 3 is too large, the width of the groove plate 3 is limited to be large, and since the water flow directions in different cooling water channels 31 of the same groove plate 3 are generally set to be the same, the unevenness of the cooling of the surface of the casting blank 6 is adversely affected; on the other hand, when the number of cooling water channels 31 of the groove plate 3 is set to be too small, there is still a large space for improvement in the overall structure, cooling efficiency, and cooling effect.

[0035] Alternatively, as shown in Figure 2 The online quenching device of the slab continuous casting machine segment further includes at least two supports 4, the two supports 4 are respectively connected to the two groove plates 3 of the same group, and one groove plate 3 in each group is connected to one end of the support 4 away from the other groove plate 3, and the other end of the support 4 is fixedly arranged relative to the slab continuous casting machine or the ground. By arranging two supports 4, the two groove plates 3 are supported to fix the spatial position of the groove plate 3.

[0036] The vertically arranged support 4 is configured to be adjustable in length, so that the gap between the casting blank 6 and the groove plate 3 is within the preset range when the casting blank 6 passes through the passage. The support 4 can be in the form of a hydraulic cylinder, an air cylinder, etc., and the height position of the groove plate 3 is adjusted through the support 4, so that the gap between the casting blank 6 and the groove plate 3 is controlled to be within the preset range when the casting blank 6 passes through, as shown in Figure 1 and Figure 2 The gap h is controlled to be within the range of 5-10mm to ensure the smooth passing of the casting blank 6.

[0037] Optionally, as shown in Figure 2 The slab continuous casting machine segment online quenching device further comprises at least two distribution water tanks 2, which are respectively installed on one side of the length of the two groove plates 3 in the same group, and are in communication with the openings on one side of the length of the cooling water channel 31. The distribution water tanks 2 are configured to be filled with cooling water to realize that the openings on one side of the length of the cooling water channel 31 are configured to be filled with cooling water. Specifically, the cooling water is injected into the distribution water tanks 2 by power, and the distribution water tanks 2 distribute the high-pressure cooling water into the cooling water channel 31 of the groove plate 3. The high-pressure cooling water quickly flows in the cooling water channel 31 to form a forced convection physical image on the surface of the casting blank 6.

[0038] Optionally, the slab continuous casting machine segment online quenching device further comprises a cooling water source 1, which injects cooling water into the distribution water tanks 2 through a water pump to realize the purpose of power injection of cooling water.

[0039] Optionally, the water pump is configured to control and adjust the pressure and flow of the cooling water flowing in the cooling water channel 31 according to the actual reduction rate of the surface temperature of the casting blank 6, so that the surface temperature reduction rate of the casting blank 6 reaches the preset rate. Specifically, the pressure and flow of the cooling water are controlled and adjusted according to the reduction of the surface temperature of the casting blank 6 to meet the requirement of the surface temperature reduction rate of the casting blank 6, and the cooling rate is preferably 5℃ / S. Accordingly, the temperature reduction rate of the surface of the quenched casting blank 6 is effectively controlled by adjusting the pressure and flow of the cooling water, and the surface temperature of the casting blank 6 is set.

[0040] It should be further pointed out that, as shown in Figure 1 and Figure 2 When the device is running, there is inevitably a gap h between the casting blank 6 and the groove plate 3, and the phenomenon of outflow of cooling water from the gap h occurs; on the other hand, the outflow of cooling water from the gap h has a certain positive effect on the surface cooling of the casting blank 6.

[0041] Optionally, as shown in Figure 1As shown, the groove plate 3 is further provided with two water blocking channels 32, which are distributed in the same direction as the cooling water channels 31, and are located on both sides of the cooling water channels 31 of the groove plate 3; the water blocking channels 32 are provided with water blocking plates 5, which are vertically arranged, and are spaced apart from the groove walls of the water blocking channels 32 on both vertical sides of the water blocking plates 5, and are fixedly connected to the groove plate 3 on the side away from the passage, and are provided with water passing openings.

[0042] By installing the water blocking plates 5 in the water blocking channels 32, when the cooling water flowing out along the gap h flows into the water blocking channels 32, part of the cooling water is limited by the gap between the water blocking plates 5 and the casting blank 6, and flows along the water blocking plates 5 to pass through the water passing openings, forming a labyrinth water blocking space, as shown by the arrows in the water blocking channels 32, thereby slowing down the lateral outflow of the cooling water caused by the gap h as a whole, which is beneficial to ensuring the cooling efficiency and effect of the cooling water flowing in the cooling water channels 31 on the surface of the casting blank 6. Figure 1

[0043] Optionally, the inert gas can also be introduced into the water blocking channels 32 to prevent the outflow of the cooling water and improve or even solve the phenomenon of the outflow of the cooling water from the gap h.

[0044] Optionally, as shown in the figure, the groove plate 3 further includes a vertical baffle 33 arranged at the opening on the side of the length through which the cooling water is introduced and the opening on the opposite side, which is spaced apart from the casting blank 6 during the operation of the device, and specifically, the cooling water flowing out of the cooling water channels 31 is redirected by the vertical baffle 33 to cool the side surface of the casting blank 6, thereby achieving overall cooling of the surface of the casting blank. Figure 2

[0045] Optionally, the width direction cross section of the cooling water channels 31 can be made into an arch shape, i.e. the shape of the distal end away from the passage is semicircular or semi-elliptical.

[0046] In summary, the slab continuous casting machine segment online quenching device of the embodiment also has the advantages of simple installation, simple maintenance and easy disassembly.

[0047] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they understand the basic creative concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0048] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.​​

Claims

1. A slab caster segment on-line quenching device, characterized in that, The slab continuous caster segment on-line quenching device comprises at least one set of groove plates, each set of groove plates comprises two groove plates arranged oppositely, the two groove plates of each set are clamped to form a channel, the channel is used for passing the cast slab through the back of the last segment of the slab continuous caster, each groove plate is provided with a cooling water channel, the length direction of the cooling water channel is arranged along the width direction of the slab, the side opening of the cooling water channel is arranged towards the other groove plate, and the length side opening of the cooling water channel is configured to be connected with the cooling water to make the cooling water flow through the surface of the cast slab. The slab continuous caster segment on-line quenching device further comprises at least two supports, the two supports are respectively connected with the two groove plates of the same set, one end of the support is connected to the side of the groove plate away from the other groove plate, and the other end of the support is fixedly arranged relative to the slab continuous caster. The vertically arranged support is configured to be adjustable in length to keep the distance between the cast slab and the groove plate within a preset gap when the cast slab passes through the channel. The slab continuous caster segment on-line quenching device further comprises at least two distribution water tanks, the two distribution water tanks are respectively installed on the length side of the two groove plates of the same set, the distribution water tank is in communication with the length side opening of the cooling water channel, and the distribution water tank is configured to be connected with the cooling water to realize that the length side opening of the cooling water channel is configured to be connected with the cooling water.

2. A slab caster segment on-line quenching device as claimed in claim 1, characterized in that, The groove plate is further provided with two water blocking channels, the distribution direction of the water blocking channel is the same as that of the cooling water channel, and the two water blocking channels are respectively located on the opposite sides of the cooling water channel of the groove plate.

3. A slab caster segment on-line quenching device as claimed in claim 2, characterized in that, The water blocking channel is installed with a water blocking plate, the water blocking plate is vertically arranged, the vertical sides of the water blocking plate are spaced apart from the groove walls of the water blocking channel in the groove plate, the side of the water blocking plate away from the channel is fixedly connected with the groove plate, and the water blocking plate is provided with a water passing opening.

4. The on-line quenching device for segments of a slab caster as claimed in claim 1, characterized in that, The groove plate further comprises a vertical baffle arranged at the opening opposite to the length side opening connected with the cooling water.

5. The on-line quenching device for segments of a slab caster as claimed in claim 1, characterized in that, The slab continuous caster segment on-line quenching device further comprises a cooling water source, the cooling water source is injected into the distribution water tank through a water pump, the water pump is configured to control and adjust the pressure and flow of the cooling water flowing in the cooling water channel according to the actual surface temperature reduction rate of the cast slab, so that the surface temperature reduction rate of the cast slab reaches a preset rate. Each groove plate is provided with at least two cooling water channels parallel to each other.

6. The on-line quenching device for segments of a slab caster as claimed in claim 1, characterized in that, The water flow directions of the cooling water channels in the two groove plates belonging to the same set are opposite.

7. The on-line quenching device for segments of a slab caster as claimed in claim 4, characterized in that, The slab continuous caster segment on-line quenching device is provided with at least two sets of groove plates, the cast slab sequentially passes through the channels formed by each set of groove plates, and the water flow directions of the cooling water channels of the adjacent two groove plates located on the same side of the channel are opposite.

8. A segmental on-line quenching device for a slab caster according to any one of claims 1-7, characterized in that, ​ 9. A segmental on-line quenching device for a slab caster according to any one of claims 1-7, characterized in that, ​ 10. A segmental on-line quenching device for a slab caster according to claim 9, characterized in that, ​

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