KR102236849B1 - Apparatus for shearing crop - Google Patents

Abstract

The present invention provides a device for shearing a crop, which measures transfer speed of a material according to images of front and rear end parts of the material and tracks length of the material to shear a crop. According to one embodiment of the present invention, the device for shearing a crop comprises: an image obtaining unit obtaining a plurality of side images of the material transferred from a rolling machine; and a calculation unit calculating the transfer speed of the material based on the side images from the image obtaining unit and controlling a shearing device shearing the crop of the material according to the calculated transfer speed of the material.

Description

Crop shearing device {APPARATUS FOR SHEARING CROP}

The present invention relates to a crop shearing device for shearing a crop of a material in a hot process.

In the process of hot rolling a steel material, cropping occurring at the front and rear ends of the material causes product quality defects, so it is necessary to cut it. At this time, in order to cut the length of the crop to a high degree, the blade of the crop shear must rotate and cut at the location to be cut in consideration of the moving speed of the material.

However, in general, cutting is performed by considering the material speed as the rotational speed of the rolling roll without directly detecting the speed of the material. At this time, in the relationship between the rotational speed of the rolling roll and the material speed, if an error occurs due to wear and slip of the rolling roll, it is difficult to accurately cut the crop length. In order to overcome this point, a laser speedometer is sometimes applied to measure the speed of a material, but the laser measurement method has a problem that is difficult to apply because there are many factors to be considered, such as water and the angle of the material surface.

Republic of Korea Patent Publication No. 10-1424462 Japanese Patent Publication No. 6365510

According to an embodiment of the present invention, there is provided a crop shearing device for shearing a crop by measuring a feed rate of a material according to an image of the front and rear ends of the material and tracking the length of the material.

In order to solve the above-described problem of the present invention, the crop shearing apparatus according to an embodiment of the present invention includes an image acquisition unit for acquiring a plurality of side images of a material conveyed from a rolling mill, and the plurality of side surfaces from the image acquisition unit. It may include a calculation unit that calculates the feed rate of the material based on the image and controls a shearing machine that shears the crop of the material according to the calculated feed rate of the material.

According to an embodiment of the present invention, there is an effect of shearing the crop according to the measured moving speed of the material to remove an error factor and shearing to a target length to be accurately sheared.

1 is a schematic configuration diagram of a crop shearing device according to an embodiment of the present invention.
FIG. 2 is a diagram of shearing a crop by calculating a moving speed of a material according to an acquired material image by a crop shearing device according to an embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention.

1 is a schematic configuration diagram of a crop shearing device according to an embodiment of the present invention.

Referring to FIG. 1, a crop shearing apparatus 100 according to an embodiment of the present invention may include an image acquisition unit 110 and an operation unit 120.

The image acquisition unit 110 may be a camera, and may continuously acquire a side image of a material.

For example, the material may be a billet.

The material (a) from the rolling mill (R) is transferred from left to right and transferred to the shearing machine (C), and the image acquisition unit 110 continuously acquires side images of the material to determine the starting position of the material tracking ( 120) can be provided.

The operation unit 120 receives side images of a plurality of consecutive materials from the image acquisition unit 110, and determines the time interval between each image and the distance between the starting position of tracking of the material and the position of the tip of the material in each image. By calculating the feed rate of the material by using, it is possible to control the crop shear of the shearing machine (C).

Here, the crop shear start point of the shear (C) is the distance (Ltrk) from the tracking start position of the material to the tip position of the material, and the shearing machine operates to shear the target shear length (Lcrop) from the image acquisition unit (110). It may be a viewpoint greater than the distance to the starting position (Laim).

The distance (Laim) from the target shear length (Lcrop) to the shear operation start position for shearing may be equal to Equation 1 below.

Equation 1)

Laim = Drts-(Lnc + 2 * Lc) + Lcrop

Here, Lnc is the distance the material moves from the start of the shearing machine to the contact position of the material, and may be equal to Equation 2) below.

Equation 2)

Lnc = (Td + Ta + Tc) * Vs

Here, Td may be a delay time, Ta may be an acceleration time, Tc may be a constant velocity time, and Vs may be a feed speed of the material.

The Lc is the distance traveled by the material from the contact with the material to the shear completion position, and may be equal to Equation 3 below.

Equation 3)

Lc = Ds / 2 * sinθ

Here, θ may be the contact angle and Ds may be the diameter of the shear.

2 is a diagram illustrating a crop shearing by calculating a moving speed of a material according to an acquired material image of a crop shearing device according to an embodiment of the present invention.

In conjunction with FIG. 1 and referring to FIG. 2, it may be assumed that the material proceeds from left to right, and for example, the image acquisition unit 110 acquires four images of the tip of the material (a).

For example, from the left, the material is the first image, the second image, the third image, and the fourth image.

The operation unit 120 may obtain a distance Ltrk0 from the start position of the material tracking to the position of the tip end of the material in the first image.

In the second image, the operation unit 120 may obtain a distance (Ltrk1) and a material speed (Vs1 = (Ltrk1-Ltrk0) / Ts) from the starting position of the material tracking to the position of the tip of the material. At this time, Ts is the time interval of each image.

In the third image, the operation unit 120 may obtain a distance (Ltrk2) and a material speed (Vs2 = (Ltrk2-Ltrk1) / Ts) from the starting position of the material tracking to the position of the tip of the material.

In the fourth image, the operation unit 120 may obtain a distance (Ltrk3) and a material speed (Vs3 = (Ltrk3-Ltrk2) / Ts) from the starting position of the material tracking to the position of the tip of the material.

Since the image of the tip of the material cannot be secured from then on, the material speed is calculated using the secured Vs1, Vs2, and Vs3.

First, if the material moves at a constant speed,

Obtain the material speed as in Equation 4 below,

Equation 4)

Vs = (Vs1 + Vs2 + Vs3) / 3

As shown in Equation 5 below, the tracking length (Ltrk) of the material can be obtained.

Equation 5)

Ltrk = Ltrk3 + Σ (Vs * Ts)

If the material moves with acceleration, the acceleration is as Equation 6 below.

Equation 6)

Av1 = Vs2-Vs1

Av2 = Vs3-Vs2

The average acceleration Av is equal to Equation 7 below,

Equation 7)

Av = (Av1 + Av2) / 2

The average speed Vs of the material is as shown in Equation 8 below,

Equation 8)

Vs = Vs3 + (Av * Ts)

The tracking length (Ltrk) of the material may be equal to Equation 9 below.

Equation 9)

Ltrk = Ltrk3 + Σ (Vs * Ts)

The operation unit 120 may control the crop shear of the shear machine C according to the tracking length Ltrk of the material calculated as described above.

As described above, according to the present invention, the effect of rolling roll wear, which may occur while calculating the moving speed of the material from the conventional rolling roll rotation speed by shearing the crop by measuring the moving speed of the material, affects the slip. It was possible to shear to the target length to be sheared accurately by removing error factors such as the effect of the shear.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, but is limited by the claims to be described later, and the configuration of the present invention is varied within the scope not departing from the technical spirit of the present invention. It can be easily understood by those of ordinary skill in the art that the present invention can be changed and modified.

100: crop shearing device
110: image acquisition unit
120: operation unit

Claims (4)

An image acquisition unit that acquires a plurality of consecutive side images of the material transferred from the rolling mill; And
Using the time interval between each image including the tip of the material among the plurality of consecutive side images from the image acquisition unit, and the distance between the starting position of tracking of the material and the position of the tip of the material in each image, the Comprising a calculation unit that calculates the feed rate of the material and controls a shearing machine that shears the crop of the material according to the calculated feed rate of the material,
If the image including the tip of the material cannot be obtained, the calculation unit calculates one of the average speed or the average acceleration of the material that cannot obtain the image including the tip based on the calculated feed speed of the material. Crop shearing device.
delete delete The method of claim 1,
The material is a billet (Billet) crop shearing device.

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