Spraying deslagging system for hot-rolled strip steel side guide device

Abstract

The utility model discloses a spray deslagging system for a hot-rolled strip steel side guide device, which is characterized in that a plurality of layer cooling roller ways are arranged below the side guide device, a slag sluice is arranged below the layer cooling roller ways, and the spray deslagging system is arranged between the slag sluice and the layer cooling roller ways; the spraying slag removal system comprises a spraying header arranged on the inner wall of the slag flushing trough, and a plurality of spraying nozzles and slag guide nozzles are arranged on the spraying header at equal intervals; the spray header is sequentially communicated with a water collector and a pressure water tank, and a control butterfly valve is arranged on a pipeline between the spray header and the water collector. The spraying deslagging system is controlled to work in real time through steel biting and steel throwing signals sent by the hot rolling strip steel rolling system, iron chips accumulated below the side guide device are effectively cleaned, caking is avoided, the hidden danger that the layer cooling roller bed is stuck and stops rotating is eliminated, the quality problem that the lower surface of hot rolling strip steel is scratched due to the fact that the layer cooling roller bed is stuck is avoided, and the production efficiency is improved. Normal operation of a production line is guaranteed, and the frequency, operation risk and labor intensity of workers for cleaning cakes are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, and particularly relates to a spray slag removal system for a side guide device of hot rolled strip steel. Background Art

[0002] The hot rolling production line of carbon steel thin plates is to preheat the thin slab produced by the previous continuous casting process through a heating furnace, roll it through a continuous rolling mill, perform laminar cooling heat treatment, convey it through a laminar cooling roller table, guide and clamp it by a side guide device, and wind it into a coil by an underground coiler. Then, it becomes a finished coil after being packed by a coil transportation system and processed by a marking machine.

[0003] Among them, the side guide device is located in front of the coiler and is used to clamp and center the hot rolled strip steel onto the rolling center line to ensure that the hot rolled strip steel has a good coiling shape after entering the coiler. During the clamping process of the side guide device and the conveying process of the laminar cooling roller table, the hot rolled strip steel will rub against the side guide device, generating a large amount of iron filings. These iron filings fall into the slag flushing groove under the laminar cooling roller table and will eventually form lumps after being roasted at high temperature. When a large amount of these lumps accumulate, they will gradually fill the gap between the bottom plate of the laminar cooling roller table and the roller, forming a great resistance to the roller or even jamming the roller and stopping it. Since the production rhythm of the hot rolling production line is relatively fast and the side guide device is the only way for the hot rolled strip steel to enter the coiler, the jamming of the roller will cause the quality problem of scratches on the lower surface of the hot rolled strip steel in batches. If the production is stopped to thoroughly clean the lumps in the gap between the roller table bottom plate and the roller, it will affect the normal production.

[0004] The existing slag removal device is to set several laminar cooling roller tables under the side guide device, and a slag flushing groove is arranged under the laminar cooling roller tables to wash away the iron filings, waste water and a small amount of oil stains generated during the operation of the laminar cooling roller tables brought by production. However, during the production process, since the output of iron filings is much greater than that of waste water, a large amount of iron filings accumulate and cannot be washed away. Eventually, the iron filings get damp and form lumps after being roasted at high temperature. The lumps accumulate more and more, and at the highest, they will accumulate to the middle position between the rollers of the laminar cooling roller table, seriously affecting the normal operation of the laminar cooling roller table.

[0005] Especially when rolling high-temperature steel grades, affected by thermal expansion, the rollers and the accumulated lumps are mutually extruded, and adjacent laminar cooling roller tables may be jammed one after another. At that time, production can only be temporarily interrupted to clean the lumps between the laminar cooling roller tables. However, since the distance between adjacent laminar cooling roller tables is about 35 mm and the slag flushing groove is in a filled state, the time for each production interruption can only be used to clean the lumps in the gap between the laminar cooling roller tables, and the lumps between the roller and the roller table bottom plate cannot be thoroughly cleaned. Later, the situation of the laminar cooling roller table being jammed will occur repeatedly, which not only affects the production rhythm of the hot rolling production line, but also causes defects such as scratches on the lower surface of a large number of hot rolled strip steels, and the product quality is low. Content of the Utility Model

[0006] The utility model provides a spray slag removal system for a side guide device of hot-rolled strip steel, aiming to solve the problems that the iron filings generated by the friction between the hot-rolled strip steel and the side guide device cannot be cleaned in time, resulting in the accumulation of iron filings to form lumps, causing the layer cooling roller table to be stuck and stopped, and scratches appearing on the lower surface of the hot-rolled strip steel.

[0007] To achieve its purpose, the utility model adopts the following technical solutions:

[0008] A spray slag removal system for a side guide device of hot-rolled strip steel, wherein a plurality of layer cooling roller tables are arranged below the side guide device, a slag flushing ditch is arranged below the layer cooling roller tables, and a spray slag removal system is arranged between the slag flushing ditch and the layer cooling roller tables; the spray slag removal system includes a spray header arranged on the inner wall of the slag flushing ditch, and a plurality of spray nozzles and slag guiding nozzles are equidistantly arranged on the spray header; a water collector and a pressure water tank are sequentially communicated with the spray header, and a control butterfly valve is arranged on the pipeline between the spray header and the water collector;

[0009] The spray slag removal system includes a PLC programmable controller, the signal input end of the PLC programmable controller is electrically connected with the signal output end of the hot-rolled strip steel rolling control system, the signal output end of the PLC programmable controller is electrically connected with the signal input end of the distribution box, and the signal output end of the distribution box is electrically connected with the control butterfly valve.

[0010] Further, the spray header is rectangular.

[0011] Further, the spray header includes a plurality of transverse spray pipes and longitudinal spray pipes.

[0012] Further, the longitudinal spray pipes are equidistantly arranged, and the distance between adjacent longitudinal spray pipes is 250 - 300 mm.

[0013] Further, the spray nozzles face the bottom of the layer cooling roller table and are inclined at 15 - 20°.

[0014] Further, the sprayed water of the spray nozzles is in a fan shape of 30 - 60°.

[0015] Further, the slag guiding nozzles face the low position of the slag flushing ditch and are inclined at 30 - 45°.

[0016] Further, the slag guiding nozzles are in a duckbill shape.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. Install the spray slag removal system provided by the present utility model between the slag flushing channel and the laminar cooling roller table. The operation of the spray slag removal system is controlled in real time by the steel biting and steel throwing signals sent by the hot-rolled strip rolling system, effectively cleaning the iron filings accumulated under the side guide device, avoiding caking, eliminating the hidden danger of the laminar cooling roller table being stuck and stopped, avoiding the quality problem of scratching the lower surface of the hot-rolled strip caused by the laminar cooling roller table being stuck, ensuring the normal operation of the production line, effectively reducing the frequency of manual cleaning of caking, operation risks and labor intensity, and being safe and efficient. Through signal detection and transmission, cooperating with the on-site control butterfly valve to open and close in time, it is intelligent and convenient, has good energy-saving and consumption-reducing effects, and high slag removal efficiency.

[0019] 2. The spray slag removal system provided by the present utility model includes a water collector and a pressure water tank. Since the spray nozzles on the spray header have a self-boosting function and the slag guiding nozzles are in a duckbill shape and can further boost pressure, the overall spray system can achieve pressurized and constant-pressure water supply, ensuring that the iron filings are washed away in time, achieving the purpose of comprehensively removing the iron filings and caking on the bottom plate of the slag flushing channel and the laminar cooling roller table. Brief Description of the Drawings

[0020] Figure 1 Schematic diagram of the caking accumulation position before installing the spray slag removal system of the present utility model;

[0021] Figure 2 Schematic diagram of the structure of the spray slag removal system of the present utility model;

[0022] Figure 3 Schematic diagram of the spray header structure in the slag flushing channel of the present utility model;

[0023] Figure 4 Schematic diagram of the spray header structure of the present utility model;

[0024] Figure 5 Front view of the spray nozzle of the present utility model;

[0025] Figure 6 For Figure 5 right view;

[0026] Figure 7 Schematic diagram of the working state of the spray nozzle of the present utility model;

[0027] In the figure: 1 - side guide device; 2 - laminar cooling roller table; 3 - slag flushing channel; 4 - hot-rolled strip; 5 - spray header; 6 - spray nozzle; 7 - transverse spray pipe; 8 - longitudinal spray pipe; 9 - slag guiding nozzle; 10 - water collector; 11 - pressure water tank; 12 - control butterfly valve; 13 - distribution box; 14 - PLC programmable controller; 15 - caking. Detailed Embodiment

[0028] The present utility model will be further described below with reference to the accompanying drawings:

[0029] like Figure 1-7 As shown, the utility model is a spray slag removal system for a hot-rolled strip side guide device, 45 layer cold rollers 2 are arranged below the side guide device 1, a slag flushing groove 3 is arranged below the layer cold roller 2, and a spray slag removal system is arranged between the slag flushing groove 3 and the layer cold roller 2. The spray slag removal system includes a rectangular spray header 5 arranged on the inner wall of the slag flushing groove 3, and the spray header 5 includes two transverse spray pipes 7 and three longitudinal spray pipes 8, and the spacing between adjacent longitudinal spray pipes 8 is 250mm.

[0030] The spray header 5 is provided with spray nozzles 6 and slag guide nozzles 9 at equal intervals. Among them, there are a total of sixteen spray nozzles 6 with a self-pressurizing function on the horizontal spray pipe 7, and the spray nozzles 6 are all set at an angle of 15° toward the bottom of the layer cooling roller 2; there are a total of eight spray nozzles 6 with a self-pressurizing function on the longitudinal spray pipe 8, the front spray nozzle 6 is set at an angle of 15° backward toward the bottom of the layer cooling roller 2, and the rear spray nozzle 6 is set at an angle of 15° forward toward the bottom of the layer cooling roller 2; the spray water of all spray nozzles 6 is in a 35° fan shape. The spray nozzle 6 is set at an angle of 15° toward the bottom of the layer cooling roller 2, which can spray the spray water onto the bottom plate of the layer cooling roller 2, avoiding the generated iron filings from being directly brought to the bottom plate of the layer cooling roller 2 through the rotation of the layer cooling roller 2, and preventing the accumulation of iron filings from forming resistance to the layer cooling roller 2.

[0031] The longitudinal spray pipe 8 is respectively provided with three slag guide nozzles 9 which are arranged at a 35° inclination toward the lower position of the slag flushing ditch 3. The slag guide nozzle 9 is welded by a 500mm long vertically downwardly installed pipeline and a duckbill type injection port. The duckbill type design can further increase the pressure, and cooperate with the inclined design of the slag flushing ditch 3 chute to flush away all the iron filings deposited in the slag flushing ditch 3 chute.

[0032] The spray header 5 is connected to a water collector 10 and a pressure water tank 11 in sequence through pipelines, which is used to ensure that the spray water pressure supplied to the spray header 5 is always stable. A control butterfly valve 12 is provided on the pipeline between the spray header 5 and the water collector 10, which is used to control the real-time opening and closing of the spray slag removal system to save energy and increase efficiency.

[0033] The spray slag removal system includes a PLC programmable controller 14, the signal input end of the PLC programmable controller 14 is electrically connected to the signal output end of the hot strip rolling control system, the signal output end of the PLC programmable controller 14 is electrically connected to the signal input end of the distribution box 13, and the signal output end of the distribution box 13 is electrically connected to the control butterfly valve 12.

[0034] During production, the hot-rolled strip 4 is rolled by the continuous rolling mill. The hot-rolled strip rolling system transmits the steel biting and steel discharging signals to the PLC programmable controller 14 of the spray slag removal system. After receiving the signals, the PLC programmable controller 14 transmits them to the distribution box 13. The distribution box 13 receives the signals and controls the butterfly valve 12 to open to supply water to the spray slag removal system. After all the spray nozzles 6 discharge water, a fully covered water curtain is formed on the bottom plate of the laminar cooling roller table 2.

[0035] The hot-rolled strip 4 is conveyed through the laminar cooling roller table 2 and enters the side guide device 1. After clamping the hot-rolled strip 4, the side guide device 1 centers it on the rolling center line. At this time, the clamping force of the side guide device 1 on the hot-rolled strip 4 can reach a maximum of 80 kN. The iron filings generated by excessive friction fall into the gap between the edge of the hot-rolled strip 4 and the side guide device 1. Then, some of the iron filings directly fall into the chute of the slag flushing ditch 3, and the other part of the iron filings fall on the laminar cooling roller table 2 and are then brought to the bottom plate below the laminar cooling roller table 2. At this time, the water curtain sprayed by the spray nozzles 6 can promptly wash the iron filings scattered on the bottom plate of the laminar cooling roller table 2 into the chute of the slag flushing ditch 3. At the same time, because all the iron filings falling into the chute of the slag flushing ditch 3 are fully softened by the spray water and then washed away by the slag guiding nozzles 9 on the spray header 5, all of them are washed away, effectively avoiding the formation of lumps on the bottom plate of the laminar cooling roller table 2 and in the chute of the slag flushing ditch 3. When the tail of the hot-rolled strip 4 completely passes through the side guide device 1, the control butterfly valve 12 receives the closing signal from the distribution box 13 and immediately stops supplying water to the spray slag removal system.

Claims

1. A spray slag removal system for a hot-rolled strip side guide device, wherein a plurality of cold rollers (2) are arranged below the side guide device (1), and a slag flushing groove (3) is arranged below the cold rollers (2), characterized in that: A spray slag removal system is provided between the slag flushing groove (3) and the layer cooling roller (2); the spray slag removal system comprises a spray header (5) provided on the inner wall of the slag flushing groove (3), and a plurality of spray nozzles (6) and slag guide nozzles (9) are provided on the spray header (5) at equal intervals; the spray header (5) is connected to a water collector (10) and a pressure water tank (11) in sequence, and a control butterfly valve (12) is provided on the pipeline between the spray header (5) and the water collector (10); The spray slag removal system comprises a PLC programmable controller (14), a signal input end of the PLC programmable controller (14) being electrically connected to a signal output end of a hot strip rolling control system, a signal output end of the PLC programmable controller (14) being electrically connected to a signal input end of a distribution box (13), and a signal output end of the distribution box (13) being electrically connected to a control butterfly valve (12).

2. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 1, characterized in that: The spray header (5) is rectangular.

3. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 2, characterized in that: The spray header (5) comprises a plurality of transverse spray pipes (7) and longitudinal spray pipes (8).

4. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 3, characterized in that: The longitudinal spray pipes (8) are arranged at equal intervals, and the spacing between adjacent longitudinal spray pipes (8) is 250-300 mm.

5. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 4, characterized in that: The spray nozzle (6) is disposed toward the bottom of the layer cooling roller (2) and is inclined at 15-20 degrees.

6. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 5, characterized in that: The spray water of the spray nozzle (6) is in the shape of a fan with an angle of 30-60°.

7. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 6, characterized in that: The slag guiding nozzle (9) is disposed toward the lower part of the slag flushing groove (3) and is inclined at 30-45 degrees.

8. A spray slag removal system for a hot-rolled strip side guide device as claimed in claim 7, characterized in that: The slag guiding nozzle (9) is in a duckbill shape.

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