A cooling bed and method for improving the flatness of hot rolled metal round bar

Abstract

The present application relates to a kind of cold bed and method for improving the flatness of hot-rolled metal round bar, belong to metallurgical industry metallurgical machinery and material processing technical field.The technical scheme is: including cold bed rack (1) and rack (7), the cold bed rack (1) is inclined structure, the higher end of cold bed rack (1) is feeding end, the lower end of cold bed rack (1) is discharging end, cold bed rack (1) is equipped with several parallelly arranged long strip-shaped gaps (6), each long strip-shaped gap (6) is equipped with a rack (7), the lower surface of each rack (7) is equipped with cam mechanism, the maximum inclination angle of each rack (7) is identical with the inclination angle of cold bed rack (1);The rack (7) tooth spacing L is 1.5 π times or 2.5 π times or 3.5 π times or 4.5 π times of metal round bar (11) radius.The beneficial effects of the present application are: can guarantee that metal round bar is uniformly cooled on cold bed, to improve the flatness of hot-rolled metal round bar.

Description

TECHNICAL FIELD

[0001] The application relates to a cooling bed and method for improving flatness of hot-rolled metal round bars, and belongs to the technical field of metallurgical machinery and material processing in the metallurgical industry. BACKGROUND

[0002] Flatness is an important technical index of hot-rolled metal round bars, and improving the flatness is of great significance to reducing the subsequent straightening workload and improving the material utilization rate. After hot rolling, the metal round bars are mostly cooled on a cooling bed. However, due to different heat dissipation conditions, the cooling speeds of the upper half circumferential surface and the lower half circumferential surface of the metal round bar are different. In particular, in the early stage of a batch of rolling, the cooling bed just starts to work, the temperature of the cooling bed body is lower, heat dissipation is faster, and the cooling of the metal round bar is more uneven. The thermal stress and phase change stress caused by different cooling speeds easily make the flatness of the metal bar worse. At present, the commonly used cooling bed in the industry cannot improve the above problems. In addition, the commonly used step-by-step cooling bed of the metal round bar needs to repeatedly lift and put down the bar on the cooling bed during work, and other types of cooling beds also need additional power to displace the metal round bar, which has very high energy consumption. SUMMARY

[0003] The purpose of the application is to provide a cooling bed and method for improving the flatness of hot-rolled metal round bars, which can ensure uniform cooling of the metal round bar on the cooling bed, thereby improving the flatness of the hot-rolled metal round bar and solving the problems in the background art.

[0004] The technical scheme of the application is as follows:

[0005] A cooling bed for improving the flatness of hot-rolled metal round bars, comprising a cooling bed rack and a rack, the cooling bed rack is an inclined structure, one end of the cooling bed rack which is higher is an upper feeding end, and one end of the cooling bed rack which is lower is a lower discharging end, a plurality of long-strip-shaped gaps are arranged in parallel on the cooling bed rack, one rack is arranged in each long-strip-shaped gap, a cam mechanism is arranged below each rack, and the maximum inclination angle of each rack is the same as the inclination angle of the cooling bed rack.

[0006] The tooth spacing L of the rack is 1.5pi times, 2.5pi times, 3.5pi times or 4.5pi times of the radius of the metal round bar.

[0007] The tooth height H of the rack is 1-2 times of the radius of the metal round bar.

[0008] The inclination angle of the cooling bed rack is 2-6°.

[0009] The lower discharging end of the cooling bed rack is rotationally connected to a support column through a rotating shaft, and the upper feeding end of the cooling bed rack is drivingly connected to a hydraulic cylinder.

[0010] The cam mechanism below the rack is two, and the two cam mechanisms are arranged at the two ends of the rack.

[0011] The cam mechanism under each rack comprises a spring connected to the rack, a push rod and a cam matched with the push rod, and the cam is driven by a motor.

[0012] A method for improving the straightness of hot-rolled metal round bars, using a cooling bed for improving the straightness of hot-rolled metal round bars as defined above, wherein the metal round bar enters the cooling bed frame from the feeding end thereof and is blocked by the first tooth of the rack. After cooling for a certain period of time, the cam rotates 180° so that the tooth top of the rack is lower than the upper surface of the cooling bed frame. At this time, the metal round bar begins to roll under the action of gravity. When the metal round bar passes the position of the first tooth of the rack, the cam rotates 180° again so that the tooth top of the rack is higher than the upper surface of the cooling bed frame. The metal round bar is blocked by the second tooth of the rack and is cooled for a certain period of time. This process is repeated until the metal round bar reaches the unloading end of the cooling bed frame.

[0013] The beneficial effects of the present invention are:

[0014] (1) It can improve the straightness of hot-rolled metal round bars, and the equipment has a simple structure and low cost.

[0015] (2) The metal round bar rolls on the cooling bed by its own gravity, without the need for additional power to lift or move it horizontally, which has a good energy-saving effect.

[0016] (3) The metal round bar is cooled evenly on the cooling bed.

[0017] (4) By replacing racks with different tooth heights, tooth widths, and tooth spacings, a wide range of rod diameters can be processed, and the cooling method is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a top view of the cooling bed stand;

[0019] Figure 2 This is a schematic diagram of the cooling bed rack;

[0020] Figure 3 This is a schematic diagram of a metal rod being blocked by the first tooth;

[0021] Figure 4 It is a schematic diagram of the rolling state of a metal round bar;

[0022] Figure 5 This is a schematic diagram of the metal rod being blocked by the second tooth;

[0023] In the figure: 1. Cooling bed frame; 2. Locking block; 3. Rotating shaft; 4. Hydraulic cylinder; 5. Support; 6. Long strip gap; 7. Rack; 8. Spring; 9. Push rod; 10. Cam; 11. Metal round rod; 12. Horizontal plane. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0025] Refer to the attached Figure 1-5 A cooling bed for improving the straightness of hot-rolled metal round bars comprises a cooling bed frame 1 and a rack 7. The cooling bed frame 1 is an inclined structure, the higher end of the cooling bed frame 1 is the loading end, and the lower end of the cooling bed frame 1 is the unloading end. The cooling bed frame 1 is provided with a plurality of parallel long strip gaps 6, each of which is provided with a rack 7, and a cam mechanism is provided under each rack 7. The maximum inclination angle of each rack 7 is the same as the inclination angle of the cooling bed frame 1.

[0026] In this embodiment, refer to the attached Figure 1-5 The cooling bed for improving the straightness of hot-rolled metal round bars comprises a cooling bed frame 1, a locking block 2, a rotating shaft 3, a hydraulic cylinder 4, a support 5, a long strip gap 6, a rack 7 and a cam mechanism, wherein:

[0027] The cooling bed frame 1 is rectangular, with a flat top surface and several elongated gaps 6 distributed throughout. The loading end of the cooling bed frame 1 is connected to the piston rod of a hydraulic cylinder 4 via a rotating shaft 3. A locking block 2 is secured to the rotating shaft 3, and a pin is provided on the locking block 2 that engages the cooling bed frame 1. The hydraulic cylinder 4 can raise the loading end of the cooling bed frame 1 so that its top surface forms an angle of 2 to 6 degrees with the horizontal plane 12, and can lock the cooling bed frame 1 using the locking block 2 and pin. The unloading end of the cooling bed frame 1 is connected to a support 5 via a rotating shaft 3.

[0028] The elongated gap 6 of the cooling bed frame 1 can accommodate the rack 7. There are two cam mechanisms below the rack 7, and the two cam mechanisms are arranged at both ends of the rack 7. The cam mechanism is a well-known technical content in the art. It mainly includes a spring 8, a push rod 9 and a cam 10. The rack 7 is connected to the push rod 9 via the spring 8. The push rod 9 is connected to the cam 10, and the cam 10 is driven by an electric motor. The cam mechanism can make the tooth top of the rack 7 lower or higher than the upper surface of the cooling bed frame 1.

[0029] The tooth height H of the rack 7 is 1 to 2 times the radius of the metal round rod, and the tooth spacing L of the rack 7 is 1.5π times, 2.5π times, 3.5π times, or 4.5π times the radius of the metal round rod 11. The corresponding rotation angle of the metal round rod 11 in each tooth spacing of the rack 7 is 270°, 450°, 630°, and 810°. In this way, the four centrally symmetrical positions on the circumference of the metal round rod 11 can be alternately facing upward, left, downward, and right, or alternately facing upward, right, downward, and left, so that the cooling is more uniform.

[0030] A method for improving the straightness of hot-rolled metal round bars is specifically performed according to the following steps:

[0031] (1) Raise the loading end of the cooling bed frame 1 by means of the hydraulic cylinder 4 so that the loading end is higher than the unloading end. The upper surface of the cooling bed frame 1 forms an angle of 2 to 6 degrees with the horizontal plane 12. After adjusting the angle of the cooling bed frame 1, lock the cooling bed frame 1 by means of the locking block 2;

[0032] (2) Adjust the length of the push rod 9 so that the inclination angle of the rack 7 is consistent with that of the cooling bed frame 1. At the same time, the cam 10 rotates so that the top of the rack 7 is higher than the upper surface of the cooling bed frame 1. The feeding end of the metal round bar 11 enters the cooling bed frame 1 and is blocked by the first tooth of the rack 7. Cool for a certain period of time. Figure 3 As shown;

[0033] (3) The cam 10 rotates 180° quickly, so that the top of the rack 7 is lower than the upper surface of the cooling bed frame 1. The metal round bar 11 begins to roll under the action of gravity, with an average displacement speed of 0.05~0.15m / s. Figure 4 As shown;

[0034] (4) When the metal round bar 11 passes the position of the first tooth of the rack 7, the cam 10 quickly rotates 180 degrees, so that the tooth top of the rack 7 is higher than the upper surface of the cooling bed frame 1 again, and the metal round bar 11 is blocked by the second tooth of the rack 7 and continues to cool for a certain period of time, as shown in the attached figure. Figure 5 As shown;

[0035] (5) This process is repeated so that the metal round bar 11 gradually moves on the cooling bed frame 1 and is stopped by each tooth in turn, so that the four symmetrical positions on the circumference of the metal round bar 11 alternately face upward, left, downward, and right, or alternately face upward, right, downward, and left, so that the cooling is more uniform.

Claims

1. A cooling bed for improving the straightness of hot-rolled metal round bars, characterized by: The cooling bed frame (1) comprises a cooling bed frame and a rack (7), wherein the cooling bed frame (1) is an inclined structure, the higher end of the cooling bed frame (1) is a loading end, and the lower end of the cooling bed frame (1) is a unloading end. The cooling bed frame (1) is provided with a plurality of parallel long strip gaps (6), each of which is provided with a rack (7), and each rack (7) is provided with a cam mechanism below. The maximum inclination angle of each rack (7) is the same as the inclination angle of the cooling bed frame (1); The tooth spacing L of the rack (7) is 1.5π times, 2.5π times, 3.5π times, or 4.5π times the radius of the metal round rod (11).

2. A cooling bed for improving the straightness of hot-rolled metal round bars according to claim 1, characterized in that: The tooth height H of the rack (7) is 1 to 2 times the radius of the metal round rod (11).

3. The cooling bed for improving the straightness of hot-rolled metal round bars according to claim 1, characterized in that: The inclination angle of the cooling bed frame (1) is 2-6°.

4. A cooling bed for improving the straightness of hot-rolled metal round bars according to claim 1 or 3, characterized in that: The unloading end of the cooling bed frame (1) is rotatably connected to the support (5) via a rotating shaft, and the loading end of the cooling bed frame (1) is drivingly connected to the hydraulic cylinder (4).

5. The cooling bed for improving the straightness of hot-rolled metal round bars according to claim 1, characterized in that: There are two cam mechanisms under the rack (7), and the two cam mechanisms are arranged at both ends of the rack (7).

6. A cooling bed for improving the straightness of hot-rolled metal round bars according to claim 5, characterized in that: The cam mechanism below each rack (7) comprises a spring (8) connected to the rack (7), a push rod (9) and a cam (10) matched with the push rod (9), and the cam (10) is driven by a motor.

7. A method for improving the straightness of hot-rolled metal round bars, characterized in that: A cooling bed for improving the straightness of hot-rolled metal round bars as defined in any one of claims 1 to 6 is used, wherein the metal round bar (11) enters the cooling bed frame (1) from the feeding end thereof and is stopped by the first tooth of the rack (7). After cooling for a certain period of time, the cam (10) rotates 180° so that the tooth top of the rack (7) is lower than the upper surface of the cooling bed frame (1). At this time, the metal round bar (11) begins to roll under the action of gravity. When the metal round bar (11) passes the position where the first tooth of the rack (7) is located, the cam (10) rotates 180° again so that the tooth top of the rack (7) is higher than the upper surface of the cooling bed frame (1). The metal round bar (11) is stopped by the second tooth of the rack (7) and is cooled for a certain period of time. This process is repeated until the metal round bar (11) reaches the unloading end of the cooling bed frame (1).

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