An upper guide system of a roughing mill

Abstract

The utility model discloses a roughing mill's upper guide system, including the guide body that sets gradually along the billet operation direction, cut water board and roll, and the guide body's guide board front end is equipped with the guide hook head, and the guide hook head is a right -hand L shape groove, and the guide body side of cut water board is equipped with the inverted L shape groove in the bottom, the inverted L shape groove with right -hand L shape groove is each mirror image, and the closed section is formed to each other buckles, and the bottom surface edge of inverted L shape groove is rounded corner setting, the bottom surface of cut water board is a continuous curved surface that first is down after in the billet operation direction, and the section height of cut water board bottom surface lowest position to inverted L shape groove's inner top surface is 110mm 2mm. The utility model not only has raised the height of the billet operation passageway below the guide body, provides enough height space for the billet head, and moreover, under the guidance of cut water board bottom surface, the billet head can be smoothly transitioned from the guide side to the roll side, and the impact of the billet head on cut water board is reduced.

Description

Technical Field

[0001] This utility model relates to the field of roughing mills, and more particularly to an upper guide system for roughing mills. Background Technology

[0002] At the R1 inlet of the hot strip roughing mill, a slab running channel is formed between the upper and lower guide systems, working together to center the slab and smoothly feed it into the rolls. The existing upper guide system has long suffered from the following structural defects, leading to decreased operating rates and increased maintenance costs: (1) Interference between guide hook and water-cutting plate: The guide body, water-cutting plate, and rolls of the upper guide system are sequentially connected along the slab running direction. The guide plate at the bottom of the guide body has a guide hook at its front end. The front end of the guide hook extends out of the guide body and inserts into the groove on the inlet side of the water-cutting plate, achieving vertical and horizontal positioning. The water-cutting plate is fixed to the roll bearing seat, closely adhering to the roll surface, to prevent cooling water overflow. The existing guide system's "throat" height is fixed: the bottom surface of the guide hook is a continuous curved surface that flattens outwards, and the bottom surface of the water-cutting plate is flush with the front bottom surface of the guide hook, forming a 75 mm fixed channel. If the slab tilts upwards beyond 75 mm, it directly impacts the root of the water-cutting plate, with the impact load instantly reaching 3 to 5 times the normal rolling force, causing the water-cutting plate to break and the guide frame to undergo plastic deformation.

[0003] (2) Loss of positioning accuracy: The guide body relies on a single guide key for positioning in conjunction with the frame. R1 adopts a "3+3" rolling mode, with the guide lifting more than 100,000 times per year. The wear of the guide key reaches 3-5 mm / year, which leads to an increase in the mating clearance, affecting the centering accuracy of the guide. The slab head is prone to warping and deviation, causing steel stacking accidents on the rolling line.

[0004] (3) High maintenance frequency and high cost: After the guide key wears out, it needs to be replaced as a whole (the guide assembly must be hoisted and removed first, then the hydraulic cylinder, refractory materials and piping must be disassembled, and finally the keyway of the guide key must be planed, welded and machined). The annual maintenance cost is high and the downtime is long. Utility Model Content

[0005] The purpose of this invention is to provide an upper guide system for a roughing mill.

[0006] The technical solution to achieve the purpose of this utility model is: an upper guide system for a roughing mill, comprising a guide body, a water-cutting plate, and a roll arranged sequentially along the slab running direction; a guide key is provided at the top of the guide body, which cooperates with a lifting drive mechanism to achieve lifting guidance; a guide plate is provided at the bottom of the guide body, and a guide hook is provided at the front end of the guide plate, the guide hook being an upright L-shaped groove; the water-cutting plate is fixed on the roll bearing seat, and its front end is in close contact with the roll surface of the roll; an inverted L-shaped groove is provided at the bottom of the guide body side of the water-cutting plate; the inverted L-shaped groove and the upright L-shaped groove are mirror images of each other, and they interlock to form a closed section; The bottom edge of the inverted L-shaped groove is rounded. The bottom surface of the water-cutting plate is a continuous curved surface that goes from bottom to top along the running direction of the slab, and the cross-sectional height from the lowest position of the bottom surface of the water-cutting plate to the inner top surface of the inverted L-shaped groove is (110±2) mm.

[0007] This invention rounds the bottom edge of the inverted L-shaped groove and designs the bottom surface of the cutting plate as a continuous curved surface that moves from bottom to top along the slab running direction. The height of the section from the lowest point of the cutting plate's bottom surface to the inner top surface of the inverted L-shaped groove is controlled to be (110±2) mm. Compared to the prior art where the bottom surface of the cutting plate is flat and the height from the bottom surface to the inner top surface of the inverted L-shaped groove is 75 mm, this invention not only raises the height of the slab running channel below the guide body, providing sufficient height space for the slab to tilt, but also allows the tilted slab to smoothly transition from the guide hook side to the roll side under the guidance of the continuous curved surface of the cutting plate. This reduces the impact of the tilted slab on the cutting plate and guide body, avoiding problems such as cutting plate breakage and plastic deformation of the guide frame.

[0008] Furthermore, the bottom front edge of the guide hook head is chamfered (preferably beveled), which helps to smoothly guide the billet tip to the water-cutting plate.

[0009] Furthermore, wear-resistant liners are fixed on both sides of the guide key, and these liners are then positioned in conjunction with the frame. By installing wear-resistant liners on the wear surface of the guide key, the guide key does not directly contact the frame, thus improving the overall wear resistance of the guide key and the wear-resistant liners.

[0010] Furthermore, an inlet water collection hood is installed behind the slab running direction of the guide body, and the inlet water collection hood and the guide body are arranged close to each other. A first guide plate and a second guide plate are also installed in the first gap between the inlet water collection hood and the guide body. The first guide plate is vertically installed on the inlet water collection hood, and the second guide plate is vertically installed on the guide body. The first guide plate and the second guide plate are arranged opposite to each other, and the second gap between them is controlled at (1.0±0.05) mm. This utility model, by adding a first guide plate and a second guide plate, and ensuring that the gap between the first guide plate and the second guide plate is smaller than the gap between the inlet water collection hood and the guide body, shortens the gap between the inlet water collection hood and the guide body to (1.0±0.05) mm, achieving a precise fit, thereby reducing the guide's sway amplitude and improving positioning accuracy. In specific implementation, there are two first guide plates, symmetrically arranged left and right; there are two second guide plates, corresponding one-to-one with the first guide plates. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the upper guide system of the roughing mill described in this embodiment of the utility model; Figure 2 This is a schematic diagram of the water-cutting plate described in an embodiment of the present utility model; Figure 3 This is a three-dimensional structural diagram of the guide key described in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the guide hook head described in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the guide body described in an embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the inlet water collection cover described in an embodiment of this utility model. Detailed Implementation

[0012] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0013] Combination Figure 1 , Figure 2 As shown, an upper guide system for a roughing mill includes a guide body 10, a water-cutting plate 20, and a roll 30 arranged sequentially along the slab running direction. The top of the guide body 10 is provided with a guide key 40, which cooperates with a lifting drive mechanism (existing conventional structure, not shown) to achieve lifting guidance. The bottom of the guide body 10 is provided with a guide plate 11, and the front end of the guide plate 11 is provided with a guide hook 111, which is an upright L-shaped groove (e.g., ...). Figure 4(as shown); the water-cutting plate 20 is fixed on the roll bearing seat (conventional structure, not shown), and its front end is in close contact with the roll surface of the roll 30; the bottom of the guide body side of the water-cutting plate 20 is provided with an inverted L-shaped groove 201; the inverted L-shaped groove 201 and the upright L-shaped groove 111 are mirror images of each other and are interlocked to form a closed section; The bottom edge 202 of the inverted L-shaped groove 201 is rounded. The bottom surface 200 of the cutting plate 20 is a continuous curved surface that moves from bottom to top along the running direction of the slab (e.g., ...). Figure 2 As shown), the cross-sectional height H from the lowest position of the bottom surface of the water-cutting plate 20 to the inner top surface of the inverted L-shaped groove 201 is (110±2) mm.

[0014] During operation, the slab runs below the guide body 10. With the guidance of the bottom surface of the guide plate 11, it is smoothly fed into the roll 30 after being guided by the water cutting plate 20.

[0015] This invention rounds the bottom edge 202 of the inverted L-shaped groove 201 and designs the bottom surface of the water-cutting plate 20 as a continuous curved surface that moves from bottom to top along the slab running direction. The cross-sectional height H from the lowest point of the bottom surface of the water-cutting plate 20 to the inner top surface of the inverted L-shaped groove 20 is controlled to be (110±2) mm. Compared with the prior art where the bottom surface of the water-cutting plate 20 is flat and the cross-sectional height H from the bottom surface of the water-cutting plate to the inner top surface of the inverted L-shaped groove 201 is 75 mm, this invention not only raises the height of the slab running channel below the guide body, providing sufficient height space for the slab to tilt, but also allows the slab tilt to smoothly transition from the guide hook side to the roll side under the guidance of the continuous curved surface of the water-cutting plate 20, reducing the impact of the slab tilt on the water-cutting plate 20 and the guide body 10, and avoiding problems such as breakage of the water-cutting plate 20 and plastic deformation of the guide frame.

[0016] Furthermore, such as Figure 1 , Figure 4 As shown, the front edge 112 of the bottom surface of the guide hook head 111 is chamfered (preferably beveled). Of course, the front edge of the bottom surface of the guide hook head 111 may not be chamfered.

[0017] Furthermore, combined Figure 1 , Figure 3 As shown, wear-resistant liners 60 are fixed on both sides of the guide key 40. The wear-resistant liners 60 are then positioned in conjunction with the frame 50 to reduce wear. In specific implementation, the wear-resistant liners 60 are fixed with M12 high-strength bolts with a preload ≥50 N·m. Of course, the wear-resistant liners 60 may not be provided on both sides of the guide key 40.

[0018] Furthermore, such as Figure 1 As shown, an inlet water collection hood 80 is installed behind the guide body 10 in the direction of slab running, and the inlet water collection hood 80 and the guide body 10 are arranged close to each other. A first guide plate 100 and a second guide plate 110 are also installed within a first gap 90 between the inlet water collection hood 80 and the guide body 10. The first guide plate 100 is vertically installed on the inlet water collection hood 80, and the second guide plate 110 is vertically installed on the guide body 10. The first guide plate 100 and the second guide plate 110 are arranged opposite to each other, and the second gap 120 between them is controlled at (1.0±0.05) mm. This invention, by adding the first guide plate 100 and the second guide plate 110, shortens the gap between the inlet water collection hood 80 and the guide body 10 to (1.0±0.05) mm, achieving a precise fit, thereby reducing the guide's sway amplitude and improving positioning accuracy. Of course, this invention can also omit the first guide plate 100 and the second guide plate 110. In the specific implementation process, combined with Figure 1 , Figure 5 and Figure 6 There may be two first guide plates 100, arranged symmetrically on the left and right; there are two second guide plates 110, arranged one-to-one with the first guide plates 100.

[0019] After implementing all the above modifications on the R1 roughing mill of the applicant's (Baosteel Desheng Stainless Steel Co., Ltd.) hot rolling mill, the following significant improvements were achieved: (1) When the wear-resistant liner 60 is made of cemented carbide plate (model: WC-12Co), after the roughing mill has been running for 6 months, the wear of the wear-resistant liner is only 0.8mm (the wear of the guide key is 3.2mm when the wear-resistant liner is not installed).

[0020] (2) Zero-cut water plate breakage fault.

[0021] (3) Reduce downtime due to malfunctions: It is estimated that unplanned downtime can be reduced by about 18 hours per year. Economic benefits = Reduced downtime × Hourly output × Per ton of steel × Effective operating rate = 18 hours × 600 tons / hour × 300 yuan / ton ≈ 3.24 million yuan / year.

[0022] (4) Reduce roll consumption: Reduce roll consumption due to impact by approximately 15 rolls per year. Economic benefits from reduced roll consumption: 4 rolls × 50,000 yuan / roll = 200,000 yuan / year.

[0023] (5) Savings in spare parts and maintenance costs: The annual cost of replacing guide keys and repairing damaged guides is reduced by approximately RMB 100,000 per year. Therefore, the total economic benefit is: RMB 3.24 million + RMB 200,000 + RMB 100,000 = RMB 3.54 million per year.

[0024] (6) Other benefits: Improve equipment reliability and ensure smooth production rhythm; save scrap steel loss; reduce the workload and difficulty of maintenance personnel.

[0025] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent process transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An upper guide system for a roughing mill, comprising a guide body, a water-cutting plate, and a roll arranged sequentially along the slab running direction; a guide key is provided at the top of the guide body, cooperating with a lifting drive mechanism to achieve lifting guidance; a guide plate is provided at the bottom of the guide body, and a guide hook is provided at the front end of the guide plate, the guide hook being an upright L-shaped groove; the water-cutting plate is fixed on the roll bearing seat, and its front end is in close contact with the roll surface of the roll; an inverted L-shaped groove is provided at the bottom of the guide body side of the water-cutting plate; the inverted L-shaped groove and the upright L-shaped groove are mirror images of each other, interlocking to form a closed section; characterized in that: The bottom edge of the inverted L-shaped groove is rounded. The bottom surface of the cutting plate is a continuous curved surface that goes from bottom to top along the running direction of the slab, and the cross-sectional height from the lowest position of the bottom surface of the cutting plate to the inner top surface of the inverted L-shaped groove is 110mm ± 2mm.

2. The upper guide system for a roughing mill according to claim 1, characterized in that: The bottom front edge of the guide hook is chamfered.

3. The upper guide system for a roughing mill according to claim 2, characterized in that: The bottom front edge of the guide hook head is beveled.

4. The upper guide system for a roughing mill according to claim 1, characterized in that: Wear-resistant liners are fixed on both sides of the guide key, and the wear-resistant liners are then positioned in conjunction with the frame.

5. The upper guide system for a roughing mill according to claim 1, characterized in that: An inlet water collection hood is installed behind the slab running direction of the guide body, and the inlet water collection hood and the guide body are arranged close to each other; a first guide plate and a second guide plate are also installed in the first gap between the inlet water collection hood and the guide body. The first guide plate is vertically installed on the inlet water collection hood, and the second guide plate is vertically installed on the guide body. The first guide plate and the second guide plate are arranged opposite to each other, and the second gap between them is controlled at 1.0mm±0.05mm.

6. The upper guide system for a roughing mill according to claim 5, characterized in that: There are two first guide plates, arranged symmetrically on the left and right; there are two second guide plates, each corresponding to one of the first guide plates.

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