A rolling line slab descaling system

Abstract

The utility model discloses a kind of rolling line slab descaling systems, including descaling machine body, descaling machine body includes upper box and transmission assembly composition, slab passage space is formed between upper box and transmission assembly, the descaling machine body includes two groups of phosphorus removal device arranged at intervals, the phosphorus removal device includes first phosphorus removal device and second phosphorus removal device, the first phosphorus removal device includes first upper water collector and first lower water collector, the first upper water collector and first lower water collector are misaligned arrangement, the second phosphorus removal device includes second upper water collector and second lower water collector, the second upper water collector and second lower water collector are misaligned arrangement, still including set in integrated phosphorus removal structure, the integrated phosphorus removal structure is set before descaling machine body.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical continuous casting and rolling technology, specifically relating to a descaling system for slabs in a rolling mill. Background Technology

[0002] In hot strip mill production lines, the descaling process removes iron oxide scale from the slab surface using high-pressure water. Existing technology suffers from the following drawbacks: Cooling structure defects: Only a single-sided upper water spray beam is installed before the descaling machine, resulting in the upper surface of the slab cooling 3-5 times faster than the lower surface. When the slab runs at a speed of 1.2-1.8 m / s, the lower surface temperature is 150-250°C higher than the upper surface, creating a thermal stress difference; Frequent production accidents: Uneven temperature causes the slab head to tilt upwards by 150-300 mm when exiting the mill; High modification costs: Traditional solutions require replacing the entire water spray beam, resulting in high modification costs and long downtime.

[0003] In view of the above factors, a descaling system for slabs in a rolling mill is provided, which solves the problem of hot-rolled slab warping by optimizing the cooling method. Utility Model Content

[0004] The purpose of this invention is to provide a descaling system for slabs in a rolling mill to solve the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved through the following technical solution: a descaling system for slabs on a rolling line, comprising a descaling machine body, the descaling machine body comprising an upper housing and a transmission assembly, a slab channel space being formed between the upper housing and the transmission assembly, the descaling machine body comprising two sets of descaling devices arranged at intervals, the descaling devices comprising a first descaling device and a second descaling device.

[0006] The first phosphorus removal device includes a first upper water collection pipe and a first lower water collection pipe, which are offset from each other.

[0007] The second phosphorus removal device includes a second upper water collection pipe and a second lower water collection pipe, which are offset from each other.

[0008] It also includes an integrated descaling structure, which is located before the descaling machine body.

[0009] Furthermore, the first upper water collection pipe of the first phosphorus removal device is connected to the output end of the hydraulic cylinder, and the hydraulic cylinder is fixed in the fixed grooves spaced apart in the upper box body;

[0010] The hydraulic cylinder is provided with multiple fixed connections to the first upper water collection pipe, and the first upper water collection pipe is provided with a number of water spray nozzles at intervals, the water spray nozzles being arranged perpendicular to the slab.

[0011] Furthermore, the second upper water collection pipe of the second phosphorus removal device is connected to the output end of the hydraulic cylinder, and the hydraulic cylinder is fixed in the fixed grooves spaced apart inside the upper box;

[0012] The hydraulic cylinder is provided with multiple fixed connections to the second upper water collection pipe, and the second upper water collection pipe is provided with a number of water spray nozzles at intervals, and the water spray nozzles are inclined to the slab.

[0013] Furthermore, the first lower water collection pipe of the first phosphorus removal device is connected to a narrow spray main pipe A and a wide spray main pipe B respectively. The narrow spray main pipe A includes an inlet pipe A and a high-pressure hose A connected to the inlet pipe A. The other end of the high-pressure hose A is connected to the first lower water collection pipe. The wide spray main pipe B includes an inlet pipe B and a high-pressure hose B connected to the inlet pipe B. The other end of the high-pressure hose B is connected to the first lower water collection pipe.

[0014] Furthermore, at least six high-pressure hoses A and at least four high-pressure hoses B are spaced apart.

[0015] Furthermore, the second lower water collection pipe of the second phosphorus removal device is connected to the wide spray main fitting C, the wide spray main fitting C includes a water inlet pipe C and a high-pressure hose C connected to the water inlet pipe C, and the other end of the high-pressure hose C is connected to the first lower water collection pipe.

[0016] Furthermore, the integrated gradient cooling structure includes dephosphorization nozzles spaced apart and intermediate cooling compensation nozzles disposed between the dephosphorization nozzles;

[0017] The outer side of the integrated gradient cooling structure is fixedly equipped with a 55-degree tilted splash guard.

[0018] The integrated gradient cooling structure is disposed between adjacent guide roller assemblies, the guide roller assembly including spaced guide rollers, which are driven to rotate by a motor.

[0019] A control method for a slab descaling system on a rolling mill includes the following steps:

[0020] An integrated gradient cooling structure is installed as a monitoring pretreatment in the area in front of the descaling machine. The descaling nozzle of the integrated gradient cooling structure serves as the basic cooling layer. The upper descaling nozzle provides a constant flow rate of 80 cubic meters per hour. The middle cooling compensation nozzle serves as a dynamic compensation layer. When the infrared thermometer in the middle layer detects that the temperature of the lower surface is 80 degrees Celsius higher than that of the upper surface, the compensation flow rate is adjusted by opening the valve by 10% for every 10 degrees Celsius increase in temperature difference. When the temperature difference drops below 30 degrees Celsius, the compensation nozzle is closed.

[0021] The upper layer is equipped with descaling nozzles with a diameter of 5 mm and a working pressure of 25 MPa, while the middle layer is equipped with cooling compensation nozzles with a diameter of 3 mm and a working pressure of 15 MPa.

[0022] The slab, after being processed by the integrated gradient cooling structure, enters the dephosphorization device. A first dephosphorization device and a second dephosphorization device are installed inside the dephosphorization device, and dephosphorization is performed on the slab above and below by the first and second dephosphorization devices.

[0023] An application of a control method for a slab descaling system in a rolling mill: This method is applied to the field of metallurgical continuous casting and rolling to solve the problem of hot-rolled slab curling.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] The integrated gradient cooling structure of this utility model ensures that when the slab exits the first rolling mill, the head height is reduced from 220 mm to 18 mm, and the rolling force fluctuation range is reduced from ±120 kN to ±28 kN, completely solving the steel piling accident caused by head height.

[0026] The descaling machine of this utility model includes two sets of descaling devices arranged at intervals. The descaling device 2 includes a first descaling device and a second descaling device. The descaling operation is carried out efficiently and stably through the first descaling device and the second descaling device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the descaling machine body and transmission components of this utility model;

[0028] Figure 2 This is a schematic diagram of the installation of the phosphorus removal device of this utility model;

[0029] Figure 3 This is a partially enlarged schematic diagram of the first phosphorus removal device of this utility model;

[0030] Figure 4 This is a partially enlarged schematic diagram of the second phosphorus removal device of this utility model;

[0031] Figure 5 This is a schematic diagram of the first upper water collection pipe of this utility model;

[0032] Figure 6 This is a schematic diagram of the second upper water collection pipe of this utility model;

[0033] Figure 7 These are schematic diagrams of the narrow spray main pipe and the wide spray main pipe of this utility model;

[0034] Figure 8 This is a schematic diagram of the wide spray pipe component of this utility model;

[0035] Figure 9 This is a schematic diagram of the integrated gradient cooling structure of this utility model. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] like Figure 1-9 As shown, a slab descaling system for a rolling line includes a descaling machine body 1. The descaling machine body 1 consists of an upper housing (with an inlet and an outlet arranged along the slab movement direction) and a transmission assembly (including several guide rollers driven by a motor). A slab channel space is formed between the upper housing and the transmission assembly. The descaling machine body 1 includes two sets of descaling devices 2 arranged at intervals. The descaling devices 2 include a first descaling device 3 and a second descaling device 4.

[0040] The first phosphorus removal device 3 includes a first upper water collection pipe 31 and a first lower water collection pipe 32, wherein the first upper water collection pipe 31 and the first lower water collection pipe 32 are staggered.

[0041] The second phosphorus removal device 4 includes a second upper water collection pipe 41 and a second lower water collection pipe 42, wherein the second upper water collection pipe 41 and the second lower water collection pipe 42 are staggered.

[0042] It also includes an integrated gradient cooling structure 5, which is disposed in front of the descaling machine body 1.

[0043] The first upper water collection pipe 31 and the first lower water collection pipe 32, the second upper water collection pipe 41 and the second lower water collection pipe 42 are respectively connected to the water inlet pipe. An electrically controlled valve is installed on the water inlet pipe. The electrically controlled valve is electrically connected to the PLC controller. At the same time, the PLC controller is electrically connected to the high-pressure pump installed on the water inlet pipe.

[0044] To facilitate the adjustment of the distance between the water spray nozzle 8 and the slab by the hydraulic cylinder during use, the first upper water collection pipe 31 of the first dephosphorization device 3 is connected to the output end of the hydraulic cylinder 6, and the hydraulic cylinder 6 is fixed in the fixed grooves 7 spaced apart in the upper box body.

[0045] The hydraulic cylinder 6 is provided with multiple fixed connections to the first upper water collection pipe 31. The first upper water collection pipe 31 is provided with a number of water spray nozzles 8 at intervals. The water spray nozzles 8 are arranged perpendicular to the slab.

[0046] To facilitate the adjustment of the distance between the water spray nozzle 8 and the slab by the hydraulic cylinder during use, the second upper water collection pipe 41 of the second dephosphorization device 4 is connected to the output end of the hydraulic cylinder 6, and the hydraulic cylinder 6 is fixed in the fixed grooves 7 spaced apart in the upper box body.

[0047] The hydraulic cylinder 6 is provided with multiple fixed connections to the second upper water collection pipe 41. The second upper water collection pipe 41 is provided with a number of water spray nozzles 8 at intervals. The water spray nozzles 8 are inclined to the slab. The number of water spray nozzles 8 provided on the second upper water collection pipe 4 at intervals are inclined towards the outlet direction.

[0048] The aforementioned hydraulic cylinder 6 is electrically connected to a PLC controller. The PLC controller controls the hydraulic proportional system of the hydraulic cylinder 6 to adjust the distance between the water nozzle 8 and the upper surface of the plate. The hydraulic cylinder 6 is directly connected to the upper manifold, and the actual stroke of the hydraulic cylinder is detected by the displacement sensor built into the hydraulic cylinder.

[0049] To facilitate operation and reduce the impact of water collection pipe vibration, the first lower water collection pipe 32 of the first phosphorus removal device 3 is connected to a narrow spray main pipe fitting A33 and a wide spray main pipe fitting B34. The narrow spray main pipe fitting A33 includes an inlet pipe A35 and a high-pressure hose A36 connected to the inlet pipe A35. The other end of the high-pressure hose A36 is connected to the first lower water collection pipe 32. The wide spray main pipe fitting B34 includes an inlet pipe B37 and a high-pressure hose B38 connected to the inlet pipe B37. The other end of the high-pressure hose B38 is connected to the first lower water collection pipe 32.

[0050] At least six high-pressure hoses A36 are spaced apart, and at least four high-pressure hoses B38 are spaced apart.

[0051] The above-mentioned system effectively counteracts the impact of the impact force by setting up two forms: narrow spray main pipe fitting A33 and wide spray main pipe fitting B34, and connecting them to the first lower water collection pipe 32 through high-pressure hoses A36 and B38.

[0052] To facilitate operation and reduce the impact of water collection pipe vibration, the second lower water collection pipe 42 of the second phosphorus removal device 4 is connected to the wide spray main fitting C43. The wide spray main fitting C43 includes an inlet pipe C44 and a high-pressure hose C45 connected to the inlet pipe C44. The other end of the high-pressure hose C45 is connected to the first lower water collection pipe 42.

[0053] Spray nozzles are arranged at intervals on the first lower water collection pipe 32 and the second lower water collection pipe 42.

[0054] In order to achieve dynamic compensation during use, the integrated gradient cooling structure 5 includes dephosphorization nozzles 51 arranged at intervals and intermediate cooling compensation nozzles 52 arranged between the dephosphorization nozzles 51. The dephosphorization nozzles 51 are located on the lower surface of the slab.

[0055] Among them, the phosphorus removal nozzle 51 and the middle layer cooling compensation nozzle 52 are connected to the water collection pipeline, and multiple phosphorus removal nozzles 51 and middle layer cooling compensation nozzles 52 are arranged.

[0056] The integrated gradient cooling structure 5 has a splash guard 53 with a 55-degree tilt angle fixedly installed on its outer side;

[0057] The integrated gradient cooling structure 5 is disposed between adjacent guide roller assemblies. The guide roller assembly includes guide rollers arranged at intervals, and the guide rollers are driven to rotate by a motor.

[0058] The aforementioned descaling nozzle 51 serves as the basic cooling layer, while the upper descaling nozzle provides a constant flow rate of 80 cubic meters per hour.

[0059] The middle cooling compensation nozzle 52 serves as a dynamic compensation layer. When the infrared temperature measurement of the middle layer detects that the temperature of the lower surface is 80 degrees Celsius higher than that of the upper surface, the compensation flow rate is adjusted by opening the valve by 10% for every 10 degrees Celsius increase in temperature difference. When the temperature difference drops below 30 degrees Celsius, the compensation nozzle is closed.

[0060] Among them, the middle layer cooling compensation nozzle 52 and the phosphorus removal nozzle 51 are respectively connected to the water collection pipeline, which is connected to the water inlet pipeline and transports water through a high-pressure pump.

[0061] Among them, an electrically controlled valve is installed on the water inlet pipe connected to the water collection pipeline, and the electrically controlled valve is electrically connected to the PLC controller (not shown in the figure), and the high-pressure pump is electrically connected to the PLC controller.

[0062] Temperature measurement points were set up 15 meters away from the F1 mill, and infrared thermometers (not shown in the figure) were installed. The temperature thresholds of the PLC controller were set as follows: target temperature of the upper surface: 1050 degrees Celsius, target temperature of the lower surface: 1020 degrees Celsius.

[0063] PLC controller logic: When the infrared thermometer detects that the temperature of the lower surface is 80 degrees Celsius higher than that of the upper surface, the PLC controller adjusts the compensation valve according to a ratio of 10% opening for every 10 degrees Celsius of temperature difference. When the temperature difference is less than 30 degrees Celsius, the compensation branch is automatically closed.

[0064] A control method for a slab descaling system on a rolling mill includes the following steps:

[0065] An integrated gradient cooling structure is installed as a monitoring pretreatment in the area in front of the descaling machine. The descaling nozzle of the integrated gradient cooling structure serves as the basic cooling layer. The upper descaling nozzle provides a constant flow rate of 80 cubic meters per hour. The middle cooling compensation nozzle serves as a dynamic compensation layer. When the infrared thermometer in the middle layer detects that the temperature of the lower surface is 80 degrees Celsius higher than that of the upper surface, the compensation flow rate is adjusted by opening the valve by 10% for every 10 degrees Celsius increase in temperature difference. When the temperature difference drops below 30 degrees Celsius, the compensation nozzle is closed.

[0066] The upper layer is equipped with descaling nozzles with a diameter of 5 mm and a working pressure of 25 MPa, while the middle layer is equipped with cooling compensation nozzles with a diameter of 3 mm and a working pressure of 15 MPa.

[0067] The slab, after being processed by the integrated gradient cooling structure, enters the dephosphorization device. A first dephosphorization device and a second dephosphorization device are installed inside the dephosphorization device, and dephosphorization is performed on the slab above and below by the first and second dephosphorization devices.

[0068] An application of a control method for a slab descaling system in a rolling mill: This method is applied to the field of metallurgical continuous casting and rolling to solve the problem of hot-rolled slab curling.

[0069] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A slab descaling system for a rolling mill, comprising a descaling machine body (1), the descaling machine body (1) comprising an upper housing and a transmission assembly, wherein a slab passage space is formed between the upper housing and the transmission assembly, characterized in that: The descaling machine body (1) includes two sets of descaling devices (2) arranged at intervals. The descaling devices (2) include a first descaling device (3) and a second descaling device (4). The first phosphorus removal device (3) includes a first upper water collection pipe (31) and a first lower water collection pipe (32), and the first upper water collection pipe (31) and the first lower water collection pipe (32) are offset from each other; The second phosphorus removal device (4) includes a second upper water collection pipe (41) and a second lower water collection pipe (42), which are offset from each other. It also includes an integrated gradient cooling structure (5), which is disposed before the descaling machine body (1).

2. The descaling system for slabs on a rolling mill according to claim 1, characterized in that: The first upper water collection pipe (31) of the first phosphorus removal device (3) is connected to the output end of the hydraulic cylinder (6), and the hydraulic cylinder (6) is fixed in the fixed groove (7) spaced apart in the upper box body; The hydraulic cylinder (6) is provided with multiple fixed connections to the first upper water collection pipe (31). The first upper water collection pipe (31) is provided with a number of water spray nozzles (8) at intervals. The water spray nozzles (8) are arranged perpendicular to the slab.

3. The descaling system for slabs on a rolling mill according to claim 2, characterized in that: The second upper water collection pipe (41) of the second phosphorus removal device (4) is connected to the output end of the hydraulic cylinder (6), and the hydraulic cylinder (6) is fixed in the fixed groove (7) arranged at intervals in the upper box body; The hydraulic cylinder (6) is provided with multiple fixed connections to the second upper water collection pipe (41). The second upper water collection pipe (4) is provided with a number of water spray nozzles (8) at intervals. The water spray nozzles (8) are inclined to the slab.

4. The descaling system for slabs on a rolling mill according to claim 3, characterized in that: The first lower water collection pipe (32) of the first phosphorus removal device (3) is connected to the narrow spray main pipe A (33) and the wide spray main pipe B (34) respectively. The narrow spray main pipe A (33) includes an inlet pipe A (35) and a high-pressure hose A (36) connected to the inlet pipe A (35). The other end of the high-pressure hose A (36) is connected to the first lower water collection pipe (32). The wide spray main pipe B (34) includes an inlet pipe B (37) and a high-pressure hose B (38) connected to the inlet pipe B (37). The other end of the high-pressure hose B (38) is connected to the first lower water collection pipe (32).

5. The descaling system for slabs on a rolling mill according to claim 4, characterized in that: The high-pressure hose A (36) is provided at least 6 times at intervals, and the high-pressure hose B (38) is provided at least 4 times at intervals.

6. The descaling system for slabs on a rolling mill according to claim 5, characterized in that: The second lower water collection pipe (42) of the second phosphorus removal device (4) is connected to the wide spray main fitting C (43). The wide spray main fitting C (43) includes an inlet pipe C (44) and a high-pressure hose C (45) connected to the inlet pipe C (44). The other end of the high-pressure hose C (45) is connected to the first lower water collection pipe (42).

7. The descaling system for slabs on a rolling mill according to claim 6, characterized in that: The integrated gradient cooling structure (5) includes dephosphorization nozzles (51) spaced apart and intermediate cooling compensation nozzles (52) disposed between the dephosphorization nozzles (51); The integrated gradient cooling structure (5) has a splash guard (53) with a 55-degree tilt angle fixedly installed on its outer side; The integrated gradient cooling structure (5) is disposed between adjacent guide roller assemblies, the guide roller assembly including spaced guide rollers, which are driven to rotate by a motor.

Images