CN116603862A - A Method for Preventing the Edge Running of the Strip - Google Patents

Abstract

The invention relates to a method for preventing strip steel from edge running, which is used for checking raw materials before the strip steel is on machine and preventing edge running accidents caused by edge defects of the raw materials; by arranging the grating detection device, the edge defect of the raw material strip steel before edge cutting is detected, so that the speed reduction and early warning measures are found and adopted in advance, the edge running accidents are ensured to be found and treated in time, the downtime caused by the edge running accidents is shortened, and the production efficiency is improved; the running state before strip steel trimming is ensured to be stable by arranging the press roller, and the edge running accident caused by strip steel jumping during trimming is avoided.

Description

A Method for Preventing the Edge Running of the Strip

technical field

The invention relates to the technical field of cold-rolled steel strip production, in particular to a method for preventing strip steel from running sideways.

Background technique

Cold-rolled steel strip is an important steel, which is widely used in automobile, shipbuilding, aerospace, machinery and other industries. Cold-rolled steel strip uses hot-rolled sheets as raw materials. The production process includes pickling and continuous rolling, continuous annealing, hot-dip galvanizing, coating, leveling, cross-cutting, slitting and recoiling, among which pickling and continuous rolling, continuous annealing , cross-cutting and rewinding processes are equipped with trimming process.

The purpose of strip trimming is to make the cold-rolled intermediate product have a set size to facilitate subsequent production, and to make the cold-rolled product accurate in size, neat and beautiful. As shown in Figure 1 and Figure 2, under normal circumstances, the waste edge cut off by the strip steel 1 through the edge trimmer 2 is introduced into the edge shear 4 by the waste edge chute 3 provided on both sides of the strip steel production line, and the edge shear 4 will Waste edge is cut into length and is collected in the waste edge hopper 5 that length is about 20cm. In the actual production process, due to defects such as edge gaps and sickle bends in raw materials, and vibration when cutting edges, etc., the cut waste edges cannot be smoothly introduced into the waste edge chute, resulting in edge running accidents. After a side-running accident occurs, it needs to be shut down and manually handled by the operator. The long shutdown processing time will affect the production of strip steel and pose potential safety hazards.

Contents of the invention

The invention provides a method for preventing edge running of strip steel. By taking measures such as raw material inspection, grating detection and early warning, and setting pressure rollers, the occurrence of edge running accidents of strip steel can be effectively prevented, the cold rolling production line can be guaranteed to run smoothly, and production efficiency can be improved.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

1, a kind of method that prevents strip steel from running edge, comprises following process:

1) Manually inspect the two sides of the steel coil before the steel coil is put on the machine, and the raw steel coils with cracked edges or edge gaps are not put on the machine;

2) Manually check whether the outer ring of the steel coil and the coil core are deflected before the steel coil is put on the machine. If there is a deflection, it means that there is a sickle bend at the head and tail of the strip; Increase the number of knives at the head to remove the camber at the head; for the raw steel coil with the core deflected, increase the number of knives at the end before welding with the next coil to remove the camber at the tail;

3) After the steel coil is cut at the preparation station, measure the width of the strip steel to ensure that the width of the raw strip steel is greater than the width of the strip steel after trimming by 20-30mm;

4) Along the moving direction of the strip steel, a grating detection device is installed at a position 4-6m upstream of the trimming shear. The grating detection device is respectively equipped with grating probes above the two sides of the corresponding strip steel to detect whether there are gaps and gaps on both sides of the strip steel. Sickle defect; the distance between the two grating probes can be automatically adjusted according to the strip width; when a defect is detected, the grating detection device sends a signal to the computer control system in the main control room, and an audible and visual alarm is given while the main control interface is displayed At the same time, the computer control system sends a signal to the strip steel transmission system to automatically reduce the running speed of the strip steel when it passes the trimming shear; the operator closely monitors the strip trimming status after receiving the alarm prompt, and immediately stops the strip steel if there is a phenomenon of edge running operation; after the defective part of the strip passes through the trimming shear, the strip is switched to run at the normal production speed again;

5) Along the moving direction of the strip steel, set a pressure roller device at a position 0.8-1.2m downstream of the trimming shears. The pressure roller device is composed of a pressure roller and a cylinder. The roller shafts at both ends of the pressure roller are respectively connected to the corresponding cylinders; The cylinder drives the pressure roller to move down to compress the strip steel, preventing the edge running accident caused by the strip steel jumping due to the vibration of the cutting edge shear; the pressure roller does not contact the strip steel when the edge is not trimmed;

6) Automatic control is carried out through the weld seam tracking system of the cold rolling mill. When the weld seam between the previous steel coil and the next steel coil runs to a position 4-6m upstream of the trimming shear, the strip will automatically slow down to avoid A side-running accident occurred when the weld seam passed the trimming shear at high speed.

Further, the grating detection device is composed of a grating frame, a grating probe and a probe moving mechanism; the grating frame is arranged above the moving path of the strip steel, the grating probe is installed at the bottom of the grating frame, and the probe moving mechanism is a screw drive mechanism for The grating probe is driven to move relative or opposite to each other longitudinally along the grating frame; the control end of the probe moving mechanism is connected with the computer control system in the main control room.

Further, the bottom surface of the grating probe is 200-240 mm higher than the upper surface of the steel strip.

Further, a rubber liner is provided on the outside of the pressure roller; the control end of the air cylinder is connected with the computer control system in the main control room.

Compared with prior art, the beneficial effect of the present invention is:

1) Check the raw materials before going on the machine to prevent side-running accidents caused by edge defects of raw materials;

2) Set up a grating detection device to detect the edge defects of the raw material strip before trimming, so as to detect in advance and adopt speed reduction and early warning measures to ensure timely detection and treatment of edge-running accidents, and shorten downtime caused by edge-running accidents time, improve production efficiency;

3) Set the pressure roller to ensure the stable running state of the strip before edge trimming, and avoid edge running accidents caused by strip jumping during edge trimming.

Description of drawings

Fig. 1 is a top view of strip trimming according to the present invention.

FIG. 2 is a front view of FIG. 1 .

Fig. 3 is a schematic diagram of the setting state of the grating detection device according to the present invention.

FIG. 4 is a side view of FIG. 3 .

Fig. 5 is a schematic diagram of the setting state of the pressing rollers of the present invention.

Fig. 6 is a schematic structural view of the pressing roller of the present invention.

In the figure: 1. Strip steel 2. Cutting edge shear 3. Waste edge chute 4. Cutting edge shear 5. Waste edge hopper 6. Grating frame 7. Grating probe 8. Strip steel conveying roller 9. Pressure roller 10. Air cylinder

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

A kind of method for preventing strip steel from running edge described in the present invention comprises following process:

1) Manually inspect the two sides of the steel coil before the steel coil is put on the machine, and the raw steel coils with cracked edges or edge gaps are not put on the machine;

2) Manually check whether the outer ring of the steel coil and the coil core are deflected before the steel coil is put on the machine. If there is a deflection, it means that there is a sickle bend at the head and tail of the strip; Increase the number of knives at the head to remove the camber at the head; for the raw steel coil with the core deflected, increase the number of knives at the end before welding with the next coil to remove the camber at the tail;

3) After the steel coil is cut at the preparation station, measure the width of the strip steel to ensure that the width of the raw strip steel is greater than the width of the strip steel after trimming by 20-30mm;

4) Along the moving direction of the strip steel, install a grating detection device at a position 4 to 6 m upstream of the edge trimmer, as shown in Figure 3 and Figure 4, the grating detection device is respectively equipped with a grating probe 7 above the two sides of the corresponding strip steel 1 , used to detect whether there are gaps and sickle defects on both sides of the strip 1; the distance between the two grating probes 7 can be automatically adjusted according to the width of the strip 1; when a defect is detected, the grating detection device sends a signal to the computer control system in the main control room In the main control interface, sound and light alarm prompts are given at the same time, and the computer control system sends a signal to the strip steel transmission system to automatically reduce the running speed of the strip steel when it passes the trimming shear; the operator closely monitors the belt after receiving the alarm prompt. In the edge trimming state of the steel, if there is an edge running phenomenon, the strip steel operation will be stopped immediately; after the defective parts of the strip steel are cut through the edge trimming, the strip steel will be switched to run at the normal production speed again;

5) Along the moving direction of the strip steel, install a pressure roller device at a position 0.8-1.2m downstream of the trimming shear, as shown in Figure 5 and Figure 6, the pressure roller device is composed of a pressure roller 9 and a cylinder 10, and the two ends of the pressure roller 9 The roller shafts are respectively connected to the corresponding cylinders 10; when trimming, the cylinder 10 drives the pressure roller 9 to move down to compress the strip 1, preventing the edge-running accident caused by the strip steel jumping due to the vibration of the cutting edge; when the edge is not trimmed, the pressure roller not in contact with the strip;

6) Automatic control is carried out through the weld seam tracking system of the cold rolling mill. When the weld seam between the previous steel coil and the next steel coil runs to a position 4-6m upstream of the trimming shear, the strip will automatically slow down to avoid A side-running accident occurred when the weld seam passed the trimming shear at high speed.

Further, the grating detection device is composed of a grating frame, a grating probe and a probe moving mechanism; the grating frame is arranged above the moving path of the strip steel, the grating probe is installed at the bottom of the grating frame, and the probe moving mechanism is a screw drive mechanism for The grating probe is driven to move relative or opposite to each other longitudinally along the grating frame; the control end of the probe moving mechanism is connected with the computer control system in the main control room.

Further, the bottom surface of the grating probe is 200-240 mm higher than the upper surface of the steel strip.

Further, a rubber liner is provided on the outside of the pressure roller; the control end of the air cylinder is connected with the computer control system in the main control room.

The following examples are carried out on the premise of the technical solutions of the present invention, and detailed implementation methods and specific operation processes are provided, but the protection scope of the present invention is not limited to the following examples.

【Example】

In this embodiment, the following technical measures have been taken to prevent the strip from running:

1. The cold rolling unit strictly controls the raw materials.

1. Carefully check the two sides of the steel coil before the steel coil is put on the machine, and the raw materials with cracked edges or edge gaps cannot be put on the machine.

2. Before the steel coil is put on the machine, check whether the outer ring and core of the steel coil are deflected. If there is a deflection, it means that there is a sickle bend at the head and tail of the strip. For the raw steel coil with the deviation of the outer ring, increase the number of knives when cutting the head at the preparation station to ensure that the camber of the strip head is removed; Tail knives ensure removal of strip tail camber.

3. After the steel coil is cut at the preparation station, measure the width of the strip steel with a tape measure to ensure that the width of the incoming material is 20mm greater than the width of the trimming edge. In this embodiment, the production plan requires that the width of the steel plate after trimming is 1254mm, so the width of the incoming material cannot be less than 1274mm.

2. Raster detection.

In the cold rolling mill, the steel strip is conveyed by the steel strip conveying roller 8; in this embodiment, a grating detection device is installed at a position 6m upstream of the edge trimmer to detect notches and camber defects on both sides of the steel strip. In this embodiment, the bottom surfaces of the two grating probes are 220 mm higher than the upper surface of the steel strip, and the two grating probes are respectively arranged directly above the two sides of the steel strip.

2 grating probes can automatically adjust the spacing according to the set trimming width. In this embodiment, the width of the raw material is 1274 mm; the width of the strip after trimming is set to 1254 mm, and the distance between the two grating probes is automatically adjusted to 1252 mm.

In this embodiment, there is a notch greater than 2 mm on the left side of the steel strip, and when the notched steel strip section runs below the grating probe, it is detected by the grating probe on the left, and the signal is sent to the computer control in the main control room In the system, sound and light alarm prompts are given while the operation interface is displayed; at the same time, the computer control system sends a signal to the strip steel transmission system, and the transmission system automatically reduces the running speed of the strip steel when it passes through the trimming shears.

After receiving the alarm prompt, the operator closely monitors the edge trimming status of the strip steel. If the edge running is found, the operation of the strip steel can be stopped immediately and dealt with in time. In this way, the edge running accident caused by the edge defect can be avoided under the high-speed running state of the strip steel. And greatly shorten the time to process the running edge. In this embodiment, the strip steel passes through the trimming shear at reduced speed, and there is no side-running accident.

After the notched strip section passes through the edge trimmer, the operator switches the strip running speed back to the original high-speed running state.

3. Use the pressure roller device to stabilize the strip steel.

In this embodiment, a pressing roller device is arranged at a position 1 m downstream of the trimming shears. The length of the pressing roller is 800mm, the outer diameter is 170mm, and the outer side of the pressing roller is provided with a rubber liner with a thickness of 20mm.

When the edge of the strip is cut, the cylinder drives the pressure roller to move down to press the upper surface of the strip, thus avoiding the edge-running accident caused by the jump of the strip due to the vibration of the cutting edge shear.

When edge trimming is not needed, the cylinder drives the pressure roller to lift up, which does not hinder the normal operation of the strip.

4. Automatic speed reduction when the welding seam passes through the trimming shear.

During the production of cold-rolled strip steel, at the front of the cold-rolling unit, the tail of the previous coil and the head of the next coil are welded together by a large-scale high-speed welding machine to ensure the continuous operation of the cold-rolling unit, 2 There is therefore a weld between the coils. Because the head and tail of the raw steel coil generally have problems such as excessive width and camber defects, it is easy to cause edge running when the weld is cut through the edge trimmer.

In this embodiment, through the weld seam tracking system of the cold rolling mill, when the weld seam runs to 5m before the edge trimmer, the strip speed is automatically controlled to reduce the speed of the strip, so as to avoid edge running accidents when the weld seam passes through the edge trimmer at high speed.

After taking the above measures, the cold-rolled steel strip production line of this embodiment can reduce the downtime of units caused by side-running accidents by more than 150 hours every year.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (4)

1. A method for preventing strip steel from edge running, which is characterized by comprising the following steps:

1) Manually checking 2 side edges of the steel coil before the steel coil is put on the machine, and putting the raw steel coil with a split edge or a gap at the edge part on the machine;

2) Before the steel coil is put on the machine, manually checking whether the outer ring and the coil core of the steel coil deviate, and if so, indicating that the tail section of the strip steel head has a camber; the method comprises the steps that the number of times of cutting is increased when a raw steel coil with the outer ring deviated is ready for standing and cutting, so that head camber is removed; the cutting frequency of tail cutting is increased before the raw steel coil with the deviated winding core is welded with the next steel coil, so that the camber of the tail is removed;

3) After the steel coil is ready for standing and cutting, measuring the width of the strip steel, and ensuring that the width of the raw material strip steel is 20-30 mm larger than the width of the strip steel after trimming;

4) A grating detection device is arranged at the position 4-6 m upstream of the trimming shears along the strip steel moving direction, and grating probes are respectively arranged above the two sides of the corresponding strip steel by the grating detection device and are used for detecting whether gaps and camber defects exist on the two sides of the strip steel; the interval of the 2 grating probes can be automatically adjusted according to the width of the strip steel; when the defect is detected, the grating detection device sends a signal to a computer control system of a main control room, an audible and visual alarm prompt is carried out while a main control interface is displayed, and meanwhile, the computer control system sends a signal to a strip steel transmission system, so that the running speed of strip steel when passing through trimming shears is automatically reduced; the operator closely monitors the strip steel trimming state after receiving the alarm prompt, and immediately stops the strip steel operation when the edge running phenomenon is found; after the defective part of the strip steel is cut by trimming, the strip steel is switched to run at the normal production speed again;

5) A press roller device is arranged at a position 0.8-1.2 m downstream of the trimming shears along the moving direction of the strip steel, the press roller device consists of a press roller and an air cylinder, and roll shafts at two ends of the press roller are respectively connected with the corresponding air cylinders; when trimming, the cylinder drives the press roller to move downwards to compress the strip steel, so that the edge-running accident caused by strip steel jumping due to edge-breaking shearing vibration is prevented; the press roller is not contacted with the strip steel when the edge is not cut;

6) The automatic control is carried out through a seam tracking system of the cold rolling unit, when the seam between the previous steel coil and the next steel coil runs to the position 4-6 m above the trimming shears, the strip steel is automatically slowed down, and the edge running accident is avoided when the seam passes through the trimming shears at high speed.

2. The method for preventing strip steel edge running according to claim 1, wherein the grating detection device consists of a grating frame, a grating probe and a probe moving mechanism; the grating frame is arranged above the strip steel moving path, the grating probe is arranged at the bottom of the grating frame, and the probe moving mechanism is a screw transmission mechanism and is used for driving the grating probe to longitudinally move relatively or oppositely along the grating frame; the control end of the probe moving mechanism is connected with a computer control system of the main control room.

3. A method of preventing edge runaway of a steel strip according to claim 1 or 2, wherein the bottom surface of the grating probe is 200-240 mm higher than the upper surface of the steel strip.

4. The method for preventing edge runaway of strip steel according to claim 1, wherein a rubber lining layer is arranged on the outer side of the press roll; the control end of the air cylinder is connected with a computer control system of the master control room.