A cooling device for hot-rolled strip steel production line

Abstract

The present invention relates to the technical field of strip steel production equipment, and specifically to a cooling device for a hot-rolled strip steel production line, comprising a hot rolling mill, and further comprising: a cooling box, the cooling box is located at the discharge end of the hot rolling mill, and a support plate for conveying the strip steel is provided in the cooling box, and a strip drainage hole is provided on the support plate; a spray assembly, the spray assembly comprises an infusion pipe and an adjustment plate arranged in the cooling box, the infusion pipe is provided with an active nozzle with a spraying direction toward the strip steel, the adjustment plate is slidably arranged on the cooling box and connected to the active nozzle; an auxiliary assembly, the auxiliary assembly comprises a water storage tank arranged on the support plate and connected to the strip drainage hole, and a gate plate slidably arranged on the support plate for sealing the strip drainage hole, a floating plate is installed in the water storage tank, and a lifting column for toggling the adjusting plate is provided on the floating plate. The present invention drives the adjusting plate to move by the floating plate rising due to buoyancy, and drives the active nozzle to swing, so as to achieve uniform cooling of the strip steel and improve the cooling efficiency of the strip steel.

Description

Technical Field

[0001] The invention relates to the technical field of strip steel production equipment, and in particular to a cooling device for a hot-rolled strip steel production line. Background Art

[0002] At present, strip steel is usually rolled. After the rolling operation is completed, the temperature of the strip steel is relatively high. After the finishing roll rolling operation is completed, the temperature of the strip steel is about 850-900℃. Improving the performance of the rolled piece by controlled cooling after rolling is an effective way to develop hot-rolled products. The cooling process of hot-rolled steel strip is an important link in the hot rolling production process. Its main purpose is to quickly cool the high-temperature steel strip to a temperature suitable for coiling so that the coiler can coil the strip steel.

[0003] At present, natural cooling, forced air cooling and water cooling are mainly used to cool the strip. However, since the surface temperature of the strip is high after the strip rolling operation is completed, when the hot-rolled steel strip is cooled by water spray or water curtain, a steam film will be generated between the liquid and the strip surface, thereby affecting the cooling efficiency of the strip.

[0004] When the strip is cooled by cooling liquid, a steam film will appear, which will affect the cooling efficiency of the strip. In the market, fixed nozzles are installed on both sides of the strip to achieve side spraying, breaking the steam film on the surface of the strip to improve the cooling speed and efficiency of the strip. However, due to the fixed setting of the nozzle, the contact point of the cooling liquid remains unchanged, resulting in uneven cooling of the strip, which in turn affects the cooling efficiency. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a cooling device for a hot-rolled strip production line, which can effectively solve the problems in the prior art that the nozzle is fixed when the strip is cooled, and the position of the cooling liquid is fixed when breaking through the steam film on the surface of the strip, resulting in uneven cooling and low efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a cooling device for a hot-rolled strip steel production line, comprising a hot rolling mill and further comprising:

[0008] A cooling box, the cooling box is located at the discharge end of the hot rolling mill, and a support plate for conveying the belt steel is provided in the cooling box, and strip-shaped drainage holes are provided on the support plate;

[0009] A spray assembly, the spray assembly comprising a liquid delivery pipe and an adjustment plate arranged in the cooling box, the liquid delivery pipe is provided with a movable spray head with a spraying direction toward the strip steel, the adjustment plate is slidably arranged on the cooling box and connected to the movable spray head;

[0010] The auxiliary component includes a water storage tank arranged on a support plate and connected to the strip drainage hole, and a gate plate slidably installed on the support plate for sealing the strip drainage hole. A floating plate is installed in the water storage tank, and a lifting column for moving the adjusting plate is provided on the floating plate.

[0011] Furthermore, the support plates are provided in two groups and are symmetrically distributed in the cooling box, and a conveyor belt is provided on the side of the support plates close to each other, the conveyor belt is used to convey the strip steel, the support plates are provided with guide plates located below the strip steel, and the support plates are provided with drainage grooves.

[0012] Furthermore, the infusion tubes are provided in multiple groups and are evenly distributed in the cooling box, and the regulating plate in the middle is provided with an inclined guide groove.

[0013] Furthermore, an inclined guide column is provided on the top of the lifting column, and the inclined guide column is slidably connected to the adjustment plate and extends into the inclined guide groove. When the lifting column is lifted or lowered, the adjustment plate is guided to swing toward the support plate through the inclined guide column.

[0014] Furthermore, the gate plates are provided with two groups and are respectively located on both sides of the lifting column, and a baffle extending to the water tank is provided on the top of the gate plates. In the initial state, the gate plates drop due to gravity and block the strip drainage holes. After the guide plate guides the spray water into the water tank, the float plate rises through buoyancy, thereby driving the lifting column to rise and drive the adjusting plate to move. As the float plate continues to rise, it moves the gate plates, thereby opening the strip drainage holes to discharge the liquid. The float plate drops due to gravity and drives the lifting column to drive the adjusting plate to reset.

[0015] Furthermore, the auxiliary component also includes an elastic limiter arranged on the support plate, the elastic limiter is slidably arranged on the support plate, and an elastic member is provided between the elastic limiter and the support plate, the elastic member is used to always push the elastic limiter toward the floating plate, and a guide slope is provided at one end of the elastic limiter close to the floating plate.

[0016] Furthermore, it also includes a vacuum pump, which is arranged on the support plate and connected to the cavity between the two groups of support plates, and is provided with a leakage hole connected to the water tank. A fan is rotatably installed on the vacuum pump, and the fan is coaxially connected to the driving roller on the conveyor belt.

[0017] Furthermore, an exhaust pipe is provided on one side of the vacuum pump away from the support plate, and the exhaust pipe is in a horizontal J-shape, and an end of the exhaust pipe away from the vacuum pump is higher than an end of the exhaust pipe in contact with the vacuum pump.

[0018] Furthermore, a movable frame is rotatably installed between adjacent adjustment plates, and a connecting plate is rotatably installed on one side of the adjustment plate close to the movable frame, and the connecting plate is slidably connected to the movable frame and extends into the movable frame.

[0019] Beneficial Effects

[0020] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0021] 1. The coolant is sprayed onto the steel strip through multiple sets of liquid infusion pipes through the movable nozzles for cooling. The cooling liquid falling on the steel strip will enter the water storage tank under the guidance of the guide plate. In the initial state, the gate plate drops due to gravity and blocks the strip drainage hole. The floating plate rises due to buoyancy, which in turn drives the lifting column to drive the adjustment plate to move, thereby driving the movable nozzle to swing. As the floating plate continues to rise, the gate plate is moved, thereby opening the strip drainage hole to discharge the liquid. The floating plate drops due to gravity and drives the lifting column to drive the adjustment plate to reset, thereby achieving uniform cooling of the steel strip and preventing the problem of local steam film that cannot be cooled well due to fixed spraying;

[0022] 2. When the strip steel is conveyed by the conveyor belt, the fan is driven to rotate rapidly at the same time. On the one hand, the high-temperature steam in the cooling box is discharged, and on the other hand, the cooling liquid on the upper end surface of the strip steel can be extracted to make it flow into the water tank better. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a partial cross-sectional view of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the spray assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the connection between the adjustment plate and the lifting column of the present invention;

[0028] Figure 5 It is a schematic diagram of the connection between the auxiliary component and the cooling box of the present invention;

[0029] Figure 6 For the present invention Figure 5 The enlarged view of point A in the middle;

[0030] Figure 7 It is a schematic diagram of the connection of adjacent adjustment plates of the present invention.

[0031] Figure numerals: 1. hot rolling mill; 2. cooling box; 21. support plate; 211. conveyor belt; 212. strip drainage hole; 213. vacuum cylinder; 2131. leakage hole; 214. fan; 215. guide plate; 216. drain trough; 3. spray assembly; 31. infusion pipe; 32. movable nozzle; 33. adjustment plate; 331. inclined guide groove; 35. connecting plate; 36. movable frame; 4. auxiliary assembly; 41. water storage tank; 42. floating plate; 421. lifting column; 422. inclined guide column; 43. gate; 44. elastic limiter. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention will be further described below in conjunction with the embodiments.

[0034] See attached Figure 1-7 , a cooling device for a hot-rolled strip steel production line, comprising a hot rolling mill 1, and further comprising:

[0035] A cooling box 2, the cooling box 2 is located at the discharge end of the hot rolling mill 1, and a support plate 21 for conveying the steel strip is provided in the cooling box 2. Two groups of support plates 21 are provided and symmetrically distributed in the cooling box 2, and a conveyor belt 211 is provided on the side of the support plates 21 close to each other, and the conveyor belt 211 is used to convey the steel strip. There is a gap between the upper end surface of the steel strip and the support plate 21, and an auxiliary roller is installed in the gap to prevent the steel strip from being too tightly attached to the support plate 21, so that the cooling liquid cannot fall into the guide plate 215. The support plate 21 is provided with a guide plate 215 located below the steel strip, and the support plate 21 is provided with a drainage groove 216. The guide plate 215 and the drainage groove 216 cooperate to guide the cooling water sprayed on the steel strip to the side of the support plates 21 away from each other. The support plate 21 is provided with a strip drainage hole 212, and the strip drainage hole 212 is used to re-introduce the liquid located on the side of the support plate 21 away from each other between the two groups of support plates 21, and then circulate it through the circulation equipment;

[0036] A spray assembly 3 for spraying cooling liquid on the strip steel, the spray assembly 3 comprises a liquid delivery pipe 31 and an adjusting plate 33 arranged in the cooling box 2, the liquid delivery pipe 31 is provided with an active nozzle 32 with a spraying direction toward the strip steel, the adjusting plate 33 is slidably arranged on the cooling box 2 and connected with the active nozzle 32, the liquid delivery pipe 31 is provided with a plurality of groups and is evenly distributed in the cooling box 2, the number of the adjusting plates 33 corresponds to the number of the liquid delivery pipes 31, and an inclined guide groove 331 is provided on the adjusting plate 33 located in the middle, when the adjusting plate 33 moves, the active nozzle 32 on the liquid delivery pipe 31 is moved to change the spraying direction of the active nozzle 32, so that the cooling liquid is cooled when the strip steel is cooled , can fully contact with the surface of the strip, prevent the occurrence of uneven cooling caused by fixed scouring, and improve the cooling effect. A movable frame 36 is rotatably installed between adjacent adjustment plates 33, and a connecting plate 35 is rotatably installed on the side of the adjustment plate 33 close to the movable frame 36, and the connecting plate 35 is slidably connected with the movable frame 36 and extends into the movable frame 36. When the middle adjustment plate 33 moves, the connecting plate 35 will be toggled. At this time, under the restriction of the movable frame 36, the connecting plate 35 slides in the movable frame 36 and rotates around the movable frame 36, and cooperates with the connecting plate 35 on the opposite side adjustment plate 33 to realize the dislocation movement of adjacent adjustment plates 33, thereby improving the cooling effect;

[0037] The auxiliary component 4 includes a water tank 41 arranged on the support plate 21 and connected to the strip drainage hole 212, and a gate plate 43 slidably installed on the support plate 21 for sealing the strip drainage hole 212. A floating plate 42 is installed in the water tank 41. The floating plate 42 is provided with a lifting column 421 for moving the adjustment plate 33. An inclined guide column 422 is provided on the top of the lifting column 421. The inclined guide column 422 is slidably connected to the adjustment plate 33 and extends into the inclined guide groove 331. When the lifting column 421 is raised or lowered, the adjustment plate 33 is guided to swing toward the support plate 21 through the inclined guide column 422.

[0038] Specifically, two groups of gate plates 43 are provided and are respectively located on both sides of the lifting column 421, and a baffle extending to the water tank 41 is provided on the top of the gate plate 43. In the initial state, the gate plate 43 drops due to gravity and blocks the strip drainage hole 212. After the guide plate 215 guides the spray water into the water tank 41, the float plate 42 rises due to buoyancy, thereby driving the lifting column 421 to rise to drive the adjustment plate 33 to move. As the float plate 42 continues to rise, it moves the gate plate 43, thereby opening the strip drainage hole 212 to discharge the liquid. The float plate 42 drops due to gravity and drives the lifting column 421 to drive the adjustment plate 33 to reset.

[0039] Furthermore, the auxiliary component 4 also includes an elastic limiter 44 arranged on the support plate 21, the elastic limiter 44 is slidably arranged on the support plate 21, and an elastic member is arranged between the elastic limiter 44 and the support plate 21, the elastic member is used to always push the elastic limiter 44 toward the floating plate 42, and the elastic limiter 44 is provided with a guide slope at one end close to the floating plate 42. After the water storage tank 41 collects the cooling liquid, the floating plate 42 floats and rises, thereby pushing the lifting column 421 and the inclined guide column 422 to rise, so as to drive the adjustment plate 33 to swing. When the floating plate 42 rises to the elastic limiter 44, it will be squeezed. At this time, the floating plate 42 will temporarily stop rising. When the water storage tank 41 continues to store liquid The floating plate 42 is pushed down by the buoyancy to drop the elastic limit member 44 and press the support plate 21. At this time, the floating plate 42 rises quickly and drives the gate plate 43 to open the strip drainage hole 212 to discharge the liquid in the water tank 41. When the liquid in the water tank 41 is discharged and the buoyancy cannot support the floating plate 42, the floating plate 42 drops and squeezes the elastic limit member 44 into the support plate 21 again. The gate plate 43 drops due to gravity and blocks the strip drainage hole 212 again. The above steps are repeated to realize the reciprocating lifting of the lifting column 421. At the same time, the reciprocating swing of the adjusting plate 33 drives the movable nozzle 32 to continuously change the position of the cooling liquid spray pipe strip, so that the cooling is more uniform and the cooling efficiency is improved.

[0040] In the above technical scheme, the conveyor belt 211 on the support plate 21 drives the steel strip into the cooling box 2, and multiple groups of infusion pipes 31 spray the coolant to the steel strip through the movable nozzle 32 for cooling. The cooling liquid falling on the steel strip will enter the water storage tank 41 under the guidance of the guide plate 215. In the initial state, the gate plate 43 drops due to gravity and blocks the strip drainage hole 212. The float plate 42 rises due to buoyancy, thereby driving the lifting column 421 to rise to drive the adjustment plate 33 to move, thereby driving the movable nozzle 32 to swing. As the float plate 42 continues to rise, it moves the gate plate 43, thereby opening the strip drainage hole 212 to discharge the liquid. The float plate 42 drops due to gravity and drives the lifting column 421 to drive the adjustment plate 33 to reset, thereby achieving uniform cooling of the steel strip and preventing the problem of local steam film that cannot be cooled well due to fixed spraying.

[0041] In addition, it also includes a vacuum pump 213, which is arranged on the support plate 21 and connected to the cavity between the two groups of support plates 21, and the vacuum pump 213 is provided with a leakage hole 2131 connected to the water storage tank 41, and a fan 214 is rotatably installed on the vacuum pump 213, and the fan 214 is coaxially connected to the driving roller on the conveyor belt 211, and an exhaust pipe is provided on the side of the vacuum pump 213 away from the support plate 21, and the exhaust pipe is in a horizontal J shape, and the end of the exhaust pipe away from the vacuum pump 213 is higher than the end of the exhaust pipe that contacts the vacuum pump 213.

[0042] In the above technical solution, when the steel strip is conveyed by the conveyor belt 211, the fan 214 is driven to rotate rapidly at the same time, which can discharge the high-temperature steam in the cooling box 2 on the one hand, and assist in extracting the cooling liquid on the upper end surface of the steel strip so that it can flow better into the water tank 41 on the other hand.

[0043] Working principle: the steel strip is driven into the cooling box 2 by the conveyor belt 211 on the support plate 21, and multiple groups of liquid infusion pipes 31 spray the coolant to the steel strip through the movable nozzle 32 for cooling. The cooling liquid falling on the steel strip will enter the water storage tank 41 under the guidance of the guide plate 215. In the initial state, the gate plate 43 drops due to gravity and blocks the strip drainage hole 212. The floating plate 42 rises due to buoyancy, thereby driving the lifting column 421 to rise to cooperate with the inclined guide groove 331 to drive the adjustment plate 33 to move, thereby driving the movable nozzle 32 to swing, so that the cooling liquid can better contact with the surface of the steel strip, reducing the poor cooling due to the appearance of the steam film. As the floating plate 42 continues to rise to the elastic limiter 44, it will be squeezed. At this time, the floating plate 42 will temporarily suspend its rise. When the water storage tank 41 continues to store liquid until the floating plate 42 drops under the push of buoyancy, the elastic limiter 44 presses into the support plate 21. At this time, the floating plate 42 quickly rises The lifting column 421 is lifted and drives the gate plate 43 to open the strip drainage hole 212, and the liquid in the water tank 41 is discharged at the same time. When the liquid in the water tank 41 is discharged and the buoyancy cannot support the floating plate 42, the floating plate 42 descends and squeezes the elastic limit member 44 into the support plate 21 again. The gate plate 43 drops due to gravity and blocks the strip drainage hole 212 again. The above steps are repeated to realize the reciprocating lifting of the lifting column 421. When the middle adjusting plate 33 moves, the connecting plate 35 will be moved. At this time, under the restriction of the movable frame 36, the connecting plate 35 slides in the movable frame 36 and rotates around the movable frame 36, and cooperates with the connecting plate 35 on the opposite side adjusting plate 33 to realize the misaligned movement of the adjacent adjusting plates 33. When the conveyor belt 211 conveys the strip steel, the fan 214 will rotate rapidly at the same time. On the one hand, the high-temperature steam in the cooling box 2 is discharged, and on the other hand, it can assist in extracting the cooling liquid on the upper end surface of the strip steel, so that it can flow into the water tank 41 better.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling device for a hot-rolled strip production line, comprising a hot rolling mill (1), characterized in that: Also includes: A cooling box (2), the cooling box (2) being located at the discharge end of the hot rolling mill (1), and a support plate (21) for conveying the strip steel is provided in the cooling box (2), and strip-shaped drainage holes (212) are provided on the support plate (21); A spray assembly (3), the spray assembly (3) comprising a liquid delivery pipe (31) and an adjustment plate (33) arranged in a cooling box (2), the liquid delivery pipe (31) being provided with a movable spray head (32) with a spraying direction toward the steel strip, the liquid delivery pipe (31) being provided with a plurality of groups and being evenly distributed in the cooling box (2), the adjustment plate (33) located in the middle being provided with an inclined guide groove (331), the adjustment plate (33) being slidably arranged on the cooling box (2) and connected to the movable spray head (32); An auxiliary component (4), the auxiliary component (4) comprising a water storage tank (41) arranged on a support plate (21) and connected to the strip-shaped drainage hole (212), and a gate plate (43) slidably mounted on the support plate (21) for sealing the strip-shaped drainage hole (212); a floating plate (42) is mounted in the water storage tank (41); a lifting column (421) for moving the adjustment plate (33) is provided on the floating plate (42); an inclined guide column (422) is provided on the top of the lifting column (421); the inclined guide column (422) is slidably connected to the adjustment plate (33) and extends into the inclined guide groove (331); when the lifting column (421) is lifted or lowered, the inclined guide column (422) guides the adjustment plate (33) to swing toward the support plate (21).

2. A cooling device for a hot-rolled strip production line according to claim 1, characterized in that: The support plates (21) are provided in two groups and are symmetrically distributed in the cooling box (2), and a conveyor belt (211) is provided on the side of the support plates (21) close to each other, and the conveyor belt (211) is used to convey the strip steel, and the support plates (21) are provided with guide plates (215) located below the strip steel, and the support plates (21) are provided with drainage grooves (216).

3. The cooling device for hot-rolled strip production line according to claim 1, characterized in that: The gate plates (43) are provided with two groups and are respectively located on both sides of the lifting column (421), and a blocking strip extending toward the water storage tank (41) is provided on the top of the gate plates (43). In the initial state, the gate plates (43) descend due to gravity and block the strip-shaped drainage holes (212). After the guide plate (215) guides the spray water into the water storage tank (41), the floating plate (42) rises due to buoyancy, thereby driving the lifting column (421) to rise to drive the adjustment plate (33) to move. As the floating plate (42) continues to rise, it moves the gate plates (43), thereby opening the strip-shaped drainage holes (212) to discharge the liquid. The floating plate (42) descends due to gravity and drives the lifting column (421) to drive the adjustment plate (33) to reset.

4. A cooling device for a hot strip rolling production line according to claim 3, characterized in that: The auxiliary component (4) further comprises an elastic stopper (44) arranged on the support plate (21), the elastic stopper (44) being slidably arranged on the support plate (21), and an elastic member being arranged between the elastic stopper (44) and the support plate (21), the elastic member being used to always push the elastic stopper (44) towards the floating plate (42), and a guide slope being arranged at one end of the elastic stopper (44) close to the floating plate (42).

5. The cooling device for hot-rolled strip production line according to claim 1, characterized in that: It also comprises an air pump (213), the air pump (213) being arranged on the support plate (21) and being in communication with the cavity between the two groups of support plates (21), and the air pump (213) being provided with a liquid leakage hole (2131) in communication with the water storage tank (41), and a fan (214) being rotatably mounted on the air pump (213), and the fan (214) being coaxially connected to a driving roller on the conveyor belt (211).

6. A cooling device for a hot strip rolling production line according to claim 5, characterized in that: An exhaust pipe is provided on a side of the exhaust cylinder (213) away from the support plate (21), and the exhaust pipe is in a horizontal J-shape, and an end of the exhaust pipe away from the exhaust cylinder (213) is higher than an end of the exhaust pipe in contact with the exhaust cylinder (213).

7. The cooling device for hot-rolled strip production line according to claim 1, characterized in that: A movable frame (36) is rotatably mounted between adjacent adjustment plates (33), and a connecting plate (35) is rotatably mounted on one side of the adjustment plate (33) close to the movable frame (36), and the connecting plate (35) is slidably connected to the movable frame (36) and extends into the movable frame (36).

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