JPH0372406B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a shear line for steel strip, and more specifically, the present invention relates to a shear line for steel strip. It concerns overlapping shear lines.

[Prior Art] Generally, the shearing line is the final process line in a steelworks, where the steel is finished to a predetermined size,
A predetermined number of stacked cutting boards are packed and shipped to the user. Therefore, the drawbacks of this line directly affect the quality and yield of the product, and also pose a problem in terms of quality assurance.

[Problems to be Solved by the Invention] However, the conventional shearing line has a free loop on the upstream side of the shearing machine, and is also what is called a free tension line. For this,
The conventional shear line described above has the following problems to be solved.

(1) Based on the detection results from the inspection device, the electromagnetic roll is controlled to separate good products from defective products, but since this line is a free tension line, tension is not applied to the steel strip. Because of this, the steel strip may move up and down during inspection, resulting in erroneous detection, resulting in defective products being mixed in with non-defective products, or non-defective products being mixed in with defective products. As a result, in the former case, there remains a problem with product guarantee, and in the latter case, the yield decreases.

(2) The shearing machine is integrally equipped with a leveler (shear leveler) on its entry side, and this leveler has two functions: conveying the steel strip and correcting the shape of the steel strip. , As mentioned above, due to the free tension, the shape correction effect is low and the shape of the cut plate becomes irregular. For this reason, some of the good products are of poor shape, which causes inconvenience when the cut plate is threaded, hindering the line processing, or restricting and hindering the line speed.

(3) The shear leveler is rotatably driven to transport the steel strip, but if there is a discrepancy (slip) between the running speed of the steel strip and the circumferential speed of the leveler roll, scratches will occur on the surface of the steel strip. However, this will be mixed into non-defective products (after the inspection process).

(4) When the above-mentioned slip occurs, the shearing length by the shearing machine is insufficient, and a cut plate of the predetermined size cannot be obtained.

Despite having these problems, the reason why conventional shear lines were free tension lines was that the main problem was to ensure the consistency of each piece of equipment in the shear line. Ta.
In other words, by creating a free loop, the speed imbalance of each device is absorbed in the line, and fluctuations in the shearing length of the shearing machine are prevented (although in this case there is a considerable tolerance). It is possible.

However, as product quality assurance has become stricter and dimensional accuracy has come to be required to be extremely high, the points at which problems should be solved have changed.

[Objective of the Invention] The object of the present invention is to improve the shape of cut plates taken out from a shearing machine and to prevent the occurrence of defective products under conditions where product quality assurance is strict and dimensional accuracy is also required to be extremely high. The objective is to obtain a shear line for steel strips that not only reduces the amount of stress, but also allows the cut plates being conveyed to be smoothly fed to the piler and stacked without causing collisions or poor centering, thereby improving operational efficiency.

[Means for Solving the Problems] According to the present invention, inspection devices 7 and 8 that inspect surface flaws, pinholes, etc., and a shearing machine 9' that cuts a steel strip into a predetermined length to form a cut plate. A bridle roll 20 is provided between the upstream of the shearing machine 9' and the inspection devices 7 and 8, and a bridle roll 20 is provided between the coil unwinding machine 2 and the shearing machine 9'. The passage of the steel strip is made into a consistent tight line, and the above-mentioned inspection devices 7 and 8
A non-driven leveler 19 is disposed between the bridle roll 20 and the bridle roll 20.

[Example] Now, an example of the apparatus of the present invention will be described below based on the accompanying drawings.

Referring to FIG. 1, a typical conventional steel strip shear line is shown. A rewinding machine 2 carrying a coil 1 is installed at the left end, and a side trimmer 4 and a pinch roll 5 are arranged on the right side at a predetermined distance from the unwinding machine 2. The steel strip is pulled out from the unwinder 2 to form a free loop 3, and then passed through a side trimmer 4 and a pinch roll 5 to form a free loop 6 again. The side trimmer 4 cuts off the ears from the steel strip, and the pinch roll 5 sends the steel strip to the right side. An automatic surface flaw inspection device 7 and a pinhole detector or thickness gauge 8 are arranged in this order on the downstream side of the right free loop 6, and a shearing machine 9 is installed further downstream. Belt conveyor 12 downstream of shearing machine 9
There are several pairs of electromagnetic rolls (10, 1
1), (10', 11,'), (10'', 11'') are installed, and the inspection devices 7 and 8 are used to inspect acceptable and rejected products.
Based on the signal, the material is guided to the upper or lower conveyor direction for sorting. Rejected products are electromagnetic rolls 10, 11, 1
0' and 11', and are sent to pilers 13 and 14 by a belt conveyor 12, respectively, and stacked. Acceptable products are sorted into shipping order by electromagnetic rolls 10'' and 11'', and conveyed by conveyor 12 to pilers 15 and 16, respectively, where they are stacked.

In such conventional shearing lines, not only do the sheared cut plates have poor shapes, resulting in defective products, but also the transfer from the electromagnetic roll to the conveyor 12 is not smooth, and the shearing line has to be stopped, causing defects in the cut plates. This causes the need to modify the shear line speed.

FIG. 2 shows the shearing line of the present invention, which has the same configuration as described above, but further includes a bridle roll 20 installed on the upstream side adjacent to the shearing machine 9'; A non-driven leveler 19 is installed on the side. In addition, the conventional free loop 3 provided before and after the side trimmer 4,
6 (FIG. 1), and tension is applied to the steel strip between the unwinder 2 and the bridle roll 20. Note that the straightening effect applied to the steel strip by the leveler 19 is further promoted by increasing the tension of the steel strip. The leveler 1 includes a bridle roll 20 that can adjust the tension of the steel strip.
9, it becomes possible to employ a tension leveler type leveler that can obtain highly accurate flatness based on the well-known tension leveling theory of bending and tension straightening, and the flatness of the steel strip before shearing is improved. Therefore, the shape of the cut plate after shearing is also improved.

Therefore, when the cut plate taken out from the shearing machine reaches the electromagnetic roll, there is no difficulty in transferring it to the belt conveyor 12, and the shearing line can be operated smoothly and without interruption, improving production efficiency. The above leveler can transmit the driving power of the bridle through the steel strip, so it can be non-driven.
The running speed of the steel strip and the circumferential speed of the rolls match well,
It is possible to prevent slips and scratches on the steel strip due to mismatch between the running speed of the steel strip and the circumferential speed of the roll. Furthermore, since the steel strip does not swing up and down by applying tension to the steel strip, the measurement accuracy of the inspection instruments 7 and 8 can be improved. Also free loop 3,
6 has been abolished, the total length of the shearing line has been shortened, making it possible to reduce basic costs and improve the efficiency of factory layout.

[Effects of the Invention] The present invention has been described in detail above, and can bring about the following effects.

(1) The tight line prevents the steel strip from moving up and down, thus eliminating false detection by the inspection device.

(2) When installing a bridle roll on the entry side of the shearing machine to make the shear line a tight line, a non-driven leveler can be installed to provide the function of a tension leveler, reducing the possibility of shape defects. The problems caused can be resolved.

(3) Since the leveler is non-driven and the steel strip is conveyed wrapped around a bridle roll, there is no risk of slipping like with conventional shear levelers or pinch rolls. A stable board can be obtained, and scratches can also be avoided.

(4) There is no risk of defects occurring between the inspection device and the shearing machine, and the inspection results are correctly reflected in the sorting of the electromagnetic rolls, eliminating the need for auxiliary inspections such as visual inspection after shearing.

[Brief explanation of drawings]

Figure 1 is a layout diagram showing the conventional steel strip shear line;
FIG. 2 is a layout diagram showing the steel strip shear line of the present invention. 1...Coil, 2...Rewinder, 3...Free loop,
4... Side trimmer, 5... Pinch roll, 6... Free loop, 7... Automatic surface flaw inspection device, 8... Pinhole detector, thickness gauge, 9, 9'... Shearing machine, 10
...Upstream electromagnetic roll, 11...Lower electromagnetic roll, 12
... Belt conveyor, 13 ... Defective product piler, 14
...Defective piler, 15...Good piler, 16...
Good quality piler, 17...support roll, 18...spot welder, 19...leveler, 20...bridle roll.

Claims (1)

[Claims] 1 In a steel strip shearing line equipped with inspection devices 7 and 8 for inspecting surface flaws, pinholes, etc., and a shearing machine 9' for cutting the steel strip into predetermined lengths and cutting plates, the above-mentioned shearing machine 9 ′ upstream and the above inspection device 7,
A bridle roll 20 is provided between the coil unwinding machine 2 and the shearing machine 9' to provide a consistent and tight line for the steel strip, and between the inspection devices 7 and 8 and the bridle. A steel strip shearing line characterized in that a non-driven leveler 19 is disposed between a roll 20.