CN217315153U

CN217315153U - Be used for CSP hot rolling laminar flow water-saving cooling device

Info

Publication number: CN217315153U
Application number: CN202122831930.XU
Authority: CN
Inventors: 张昭; 梁国栋
Original assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Current assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-08-30
Anticipated expiration: 2031-11-18

Abstract

The utility model provides a be used for CSP hot rolling laminar flow water-saving cooling device, including the layer cold roll table, the top of layer cold roll table is equipped with the storage water tank, the sub-unit connection of storage water tank has a plurality of cooling tubes, the cooling tube sets up along layer cold roll table length direction, be equipped with a plurality of spray pipes along its length direction on the cooling tube, the storage water tank connection has the raceway, be connected with first water delivery branch pipe and second water delivery branch pipe on the raceway, be equipped with first constant speed pump on the first water delivery branch pipe, be equipped with the inverter pump on the second water delivery branch pipe. The variable frequency pump is arranged, so that the water delivery quantity into the water storage tank is reduced during the period of waiting for the steel strip by the layer cooling roller way, and the water source waste caused by a large amount of overflow in the water storage tank is effectively prevented; the water overflowing from the water storage tank is collected in the water storage tank and is input into the water storage tank when being cooled, so that the water is recycled in time, the water circulation transmission distance is reduced, the structure is simple, and the use mode is convenient.

Description

Be used for CSP hot rolling laminar flow water-saving cooling device

Technical Field

The utility model belongs to the technical field of rolling mill equipment, a be used for CSP hot rolling laminar flow water-saving cooling device is related to.

Background

The continuous casting and rolling unit (CSP line) of the sheet billet, after rolling by the continuous rolling unit in the production process, the strip steel is cooled by a laminar cooling line from an output roller way, and then reaches a coiling machine to finish the production of the steel coil. The slab entering speed of a continuous casting machine is slow, the rolling speed of a rolling mill is high, and the situation that the rolling mill waits for the slab often occurs.

Laminar cooling water is by 4 constant speed water pumps (three pump work, a pump is reserve) of power plant, the biggest output 4800m year/h, pass through the pipeline with the circulating water in advance and carry the laminar cooling water tank at header rear, the water tank is 7.8 meters apart from ground height, water in the water tank leans on gravitational potential energy to form the pressure of laminar flow water, when needs cooling belted steel, header electromagnetic pneumatic valve is automatic to be opened, laminar flow rivers accomplish the cooling process to the slab band surface, water after the cooling flows back to power plant through the sluiceway. During the non-rolling period or when no cooling water is needed, the electromagnetic pneumatic valve of the collecting pipe is closed, redundant cooling water overflows from an overflow pipe at the upper half part of the laminar cooling water tank and returns to a power plant, because a thin slab continuous casting and rolling hot rolling unit (CSP line) is a continuous rolling unit with 2 continuous casting machines, the rolling speed of a rolling mill is usually higher than the charging speed of a slab, the rolling time of a rolling gap (waiting for rolling) is longer, and the waiting time of the rolling mill accounts for 30% during normal double-line continuous production. When a single continuous casting machine is used for production, the rolling clearance time is doubled, the waiting time of the rolling mill accounts for 60%, the water is continuously supplied by the laminar cooling water pump during the waiting of the rolling mill for steel rolling, and all water overflows from an overflow port at the middle upper part of the water tank, so that the waste of circulating water is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a be used for CSP hot rolling laminar flow water-saving cooling device to the problem that prior art exists.

Therefore, the utility model adopts the following technical scheme:

the utility model provides a be used for CSP hot rolling laminar flow water-saving cooling device, includes the cold roll table in layer, the top of the cold roll table in layer is equipped with the storage water tank, the sub-unit connection of storage water tank has a plurality of cooling tubes, the cooling tube sets up along cold roll table length direction in layer, be equipped with a plurality of spray pipes along its length direction on the cooling tube, the storage water tank connection has the raceway, be connected with first water delivery branch pipe and second water delivery branch pipe on the raceway, be equipped with first constant speed pump on the first water delivery branch pipe, be equipped with the inverter pump on the second water delivery branch pipe.

Furthermore, the upper portion of storage water tank is connected with the overflow pipe, the overflow pipe is connected with the water storage box, the water storage box is connected with the wet return, the wet return is connected with the storage water tank, be equipped with the second constant speed pump on the wet return.

Furthermore, a water level sensor is arranged in the water storage tank and connected with a controller, and the controller is connected with the variable frequency pump.

Further, the controller is a PLC controller.

Furthermore, an electromagnetic valve is arranged on the cooling pipe.

Furthermore, a water collecting tank is arranged below the layer cooling roller way.

The beneficial effects of the utility model reside in that: the variable frequency pump is arranged, so that the water delivery quantity into the water storage tank is reduced during the period of waiting for the steel strip by the layer cooling roller way, and the water source waste caused by a large amount of overflow in the water storage tank is effectively prevented; the water overflowing from the water storage tank is collected in the water storage tank and is input into the water storage tank when being cooled, so that the water is recycled in time, the water circulation transmission distance is reduced, the structure is simple, and the use mode is convenient.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a control schematic diagram of the present invention;

in the figure, 1-layer cold roller bed, 2-water storage tank, 3-cooling pipe, 4-electromagnetic valve 5-water spray pipe, 6-water delivery pipe, 7-first water delivery branch pipe, 8-second water delivery branch pipe, 9-first constant speed pump, 10 variable frequency pump, 11-overflow pipe, 12-water storage tank, 13-water return pipe, 14-second constant speed pump, 15-water level sensor, 16-controller, 17-water collecting tank.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

as shown in fig. 1 and 2, a laminar flow water-saving type cooling device for CSP hot rolling comprises a layer-cooling roller table 1, a water storage tank 2 is arranged above the layer-cooling roller table 1, the water storage tank 2 is 7.8 m away from the layer-cooling roller table, the lower part of the water storage tank 2 is connected with a plurality of cooling pipes 3, the cooling pipes 3 are arranged along the length direction of the layer-cooling roller table 1, electromagnetic valves 4 are arranged on the cooling pipes 3, a plurality of water spraying pipes 5 are arranged on the cooling pipes 3 along the length direction, the water spraying pipes 5 are commonly used water spraying pipes of the existing laminar flow cooling device, the water spraying pipes 5 are used for spraying water to a steel strip on the layer-cooling roller table 1, the water spraying operation of the water spraying pipes 5 can be controlled by the electromagnetic valves 4 to cool the steel strip, the water storage tank 2 is connected with a water delivery pipe 6, the water delivery pipe 6 is used for delivering water into the water storage tank 2, the water delivery pipe 6 is connected with a first water delivery branch pipe 7 and a second water delivery pipe 8, the first constant speed pump 9 is arranged on the first water delivery pipe 7, the second water delivery branch pipe 7 is provided with a variable frequency pump 10, the first water delivery branch pipe 7 and the second water delivery branch pipe 8 are both connected with a water source of a power plant of a steel mill, water is input into the water storage tank 2 through the first constant speed pump 9 and the variable frequency pump 10, and the water delivery rate can be controlled through the variable frequency pump 10.

The upper portion of storage water tank 2 is connected with overflow pipe 11, and overflow pipe 11 is connected with water storage tank 12, and water storage tank 12 is connected with wet return 13, and accessible overflow pipe 11 overflows to storage tank 12 when the water in storage water tank 2 is too much and stores, and wet return 13 is connected with storage water tank 1, is equipped with second constant speed pump 14 on wet return 13, and accessible wet return 13 is defeated the water in the storage water tank 12 back to storage water tank 2 in order to use when cooling.

Be equipped with level sensor 15 in the storage water tank 2, level sensor 15 is connected with controller 16, and controller 16 is connected with inverter pump 10, and controller 16 adopts the PLC controller, and when the water level of storage water tank 2 reachd the high overflow that begins of overflow pipe 11, controller 16 control inverter pump 10 reduces the water output and prevents that a large amount of overflows of rivers from causing the waste.

In addition, a water collecting tank 17 for collecting cooling water is arranged below the layer cooling roller table 1, and the cooling water is collected in the water collecting tank 1 so as to be recycled.

The utility model discloses a use as follows:

when a steel strip enters a layer cooling roller way 1 through hot rolling, an electromagnetic valve 4 is opened, water in a water storage tank 2 is sprayed out from a water spray pipe 5 through a cooling pipe 3, the steel strip enters a rolling gap after laminar cooling of the steel strip is completed, the electromagnetic valve 4 is closed at the moment, the water spray pipe 5 stops spraying water, the water level in the water storage tank 2 rises, when the water level in the water storage tank 2 rises to the height of an overflow pipe 11 and begins to overflow, a water level sensor 15 sends a signal to a controller 16, the controller 16 controls a variable frequency pump 10 to reduce power, the water delivery quantity in the water storage tank 2 is reduced, water sources are saved, after a subsequent steel strip enters the layer cooling roller way 1, the water spray pipe 5 of the electromagnetic valve 4 is opened for water spray cooling, the water level in the water storage tank 2 drops, the water level sensor 15 sends a signal to the controller 16, the controller 16 controls the variable frequency pump 10 to increase power so as to meet cooling water requirements, and a second constant speed pump 14 is started at the same time, compared with the prior art, the water storage device has the advantages that the water in the water storage tank 12 is conveyed back to the water storage tank 2 through the water return pipe 13 for cooling, the water overflow in the water storage tank can be effectively reduced, the water source is avoided, the waste is caused, and meanwhile, the water pump and the electric quantity consumption are saved.

Claims

1. The utility model provides a be used for CSP hot rolling laminar flow water-saving cooling device, its characterized in that, includes layer cold roll table (1), the top of layer cold roll table (1) is equipped with storage water tank (2), the sub-unit connection of storage water tank (2) has a plurality of cooling tubes (3), cooling tube (3) are followed layer cold roll table (1) length direction and are set up, be equipped with a plurality of spray pipes (5) along its length direction on cooling tube (3), storage water tank (2) are connected with raceway (6), be connected with first water delivery branch pipe (7) and second water delivery branch pipe (8) on raceway (6), be equipped with first constant speed pump (9) on first water delivery branch pipe (7), be equipped with frequency conversion pump (10) on second water delivery branch pipe (8).

2. The water-saving cooling device for the CSP hot rolled laminar flow is characterized in that an overflow pipe (11) is connected to the upper part of the water storage tank (2), a water storage tank (12) is connected to the overflow pipe (11), a water return pipe (13) is connected to the water storage tank (12), the water return pipe (13) is connected with the water storage tank (2), and a second constant speed pump (14) is arranged on the water return pipe (13).

3. The water-saving cooling device for the CSP hot rolled laminar flow is characterized in that a water level sensor (15) is arranged in the water storage tank (2), the water level sensor (15) is connected with a controller (16), and the controller (16) is connected with a variable frequency pump (10).

4. A water-saving cooling apparatus for CSP hot rolled laminar flow according to claim 3, characterized in that said controller (16) is a PLC controller.

5. The water-saving cooling device for the CSP hot-rolled laminar flow is characterized in that the cooling pipe (3) is provided with an electromagnetic valve (4).

6. The water-saving cooling device for the CSP hot rolling laminar flow is characterized in that a water collecting tank (17) is arranged below the laminar cooling roller table (1).