Application method of strip steel uncoiling unit

Abstract

The invention relates to the field of strip steel quality inspection. The invention discloses an application method of a strip steel uncoiling unit. The strip steel uncoiling unit comprises a feeding trolley, an uncoiling machine, a material guiding and clamping flattening machine, a transverse shearing machine, a slitter edge coiling machine, a tensioning mechanism, a coiling machine, a circle shear, a material distributing pressing arm, a discharging trolley, a movable supporting arm and a discharging rack. After strip steel production is completed, if any one of the following conditions is met, the strip steel uncoiling unit is used for conducting quality inspection: the first condition is that a finishing mill starts to produce a second coil of strip steel after a new roller (a working roller of the finishing mill is replaced) is replaced every time in each roller replacement period (120 km roller replacement is set); the second condition is that in each roller changing period, if an accident occurs midway in the finishing mill, a first coil of strip steel produced after the accident is recovered; and (3) a roll of strip steel is randomly drawn in the normal production process in the roll changing period.

Description

Technical Field

[0001] The invention relates to the field of strip steel inspection. Background Art

[0002] Width less than 600mm is generally called strip steel, width between 600mm-900mm is generally called medium-wide band, and width greater than 900mm is generally called coil. Coil steel online is equipped with thickness gauge (to measure thickness), width gauge (to measure width), convexity gauge (to measure plate convexity), flatness gauge (to measure plate shape) and surface detector (to identify surface quality) to comprehensively monitor and detect quality, and even conduct feedback control. Some medium-wide bands are also equipped with thickness gauges, width gauges, convexity gauges, flatness gauges and surface detectors to comprehensively monitor and detect quality. Strip steel online is only equipped with thickness gauges and width gauges, without any other automated testing equipment.

[0003] The strip steel production process is generally as follows: slab heating - rough rolling - intermediate roller - finishing rolling - three-way diversion - plate transport chain - tension straightening machine - transport roller - packaging - number spraying - unloading - warehousing - sales to customers.

[0004] The current status of strip quality inspection is that after the steel coil is rolled, the two strips at the tail are manually opened to inspect the tail. Generally, the quality of the sickle bend, surface, width, thickness, plate shape, etc. is inspected. The current inspection method cannot inspect the quality of other positions along the entire length of the steel coil. The current drawbacks of strip quality inspection are: it is impossible to conduct a comprehensive quality inspection of the strip along the entire length, and quality problems cannot be discovered in time, resulting in batch quality objections, and a lag in equipment improvement and quality rectification.

[0005] During the strip production process, the final product is delivered to the warehouse in coils. Except for the thickness and width detection by measuring instruments online, there are no other means to detect surface, plate shape, edge quality items. Therefore, the sickle bend, plate shape, convexity, surface scratches, surface iron oxide scale, head and tail width deformation zone length and other quality problems of the strip cannot be detected after being coiled. Since the production, many quality objections have arisen due to various quality problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is: how to conduct a comprehensive inspection of the quality of the entire length of the strip at the lowest cost to avoid batch quality disputes, make timely adjustments to production through the quality defects detected, and play a guiding role in the hidden dangers of the equipment.

[0007] The technical solution adopted by the present invention is: an application method of a strip steel uncoiling unit, the strip steel uncoiling unit includes a loading car, an uncoiling machine, a material feeding clamping and leveling machine, a transverse shearing machine, a scrap edge coiling machine, a tensioning mechanism, a coiling machine, a disc shear, a material dividing and pressing arm, a discharge car, a movable support arm, and a discharge platform; after the strip steel production is completed, the strip steel uncoiling unit is used to perform quality inspection if any of the following conditions are met: Condition 1: The strip steel is the second strip steel rolled after each roll change during the strip steel finishing rolling process; Condition 2: If an accident occurs during production, the strip steel shall be the first strip steel after the accident is recovered; Condition 3: The strip steel is a roll of strip steel randomly selected from the normal production process.

[0008] During the quality inspection, check the thickness, width, camber, plate shape, convexity, surface scratches, and surface iron oxide scale of the strip. The thickness includes the thickness of the head, middle, and tail of the strip, and the width includes the width of the head, middle, and tail of the strip. When checking the thickness, use a micrometer to check the thickness of the strip at 5 meters from the head, a random position in the middle, and 5 meters from the tail. When checking the width, use a caliper or tape measure to check the width of the strip at 1, 3, 5, and 10 meters from the head, a random position in the middle, and 1, 3, 5, and 10 meters from the tail. When checking the camber, use a caliper or tape measure to check the width of the strip at 5 meters from the head, 2 random positions in the middle, and 1, 3, 5, and 10 meters from the tail. At random positions, sickle bend inspection is carried out at 5 meters from the tail. For each position, a 4-meter-long steel wire is used close to the edge of the strip, and a steel ruler or tape measure is used to measure the position where the distance between the steel wire and the edge is the largest. When checking the plate shape, a 1-meter steel ruler is used to measure the height of the maximum wave position close to the upper surface of the strip edge. When checking the convexity, a micrometer is used to check the irregularities of the head and tail of the strip cut by the cross-cutting unit. When checking the surface scratches, the upper and lower surfaces of the strip are inspected with the naked eye. When checking the surface iron oxide scale, the upper and lower surfaces of the strip are inspected with the naked eye.

[0009] The quality inspection process is to lift the strip to be inspected onto the loading car, which is then sent to the uncoiler reel. The reel diameter is tightened, and the head of the strip is sent to the feeding clamp and leveling roller with manual assistance. During this process, the machine can be stopped at any time and anywhere to facilitate the inspection of various quality items. The strip head is fed into the coiler through the tensioning mechanism. After the coil is formed, the main train is removed by the unloading car, and the finished product is hoisted to the storage site by an overhead crane.

[0010] If problems are found during the quality inspection, the unit producing the strip will be adjusted and rectified, and the quality of the subsequent roll of strip with problems will be inspected.

[0011] The beneficial effects of the present invention are as follows: the strip steel unwinding unit used in the present invention is the equipment that the strip steel production enterprise already has, and there is no need to purchase additional equipment, so the inspection cost is low. The present invention establishes a perfect strip steel detection means, which can improve the quality of the strip steel, can truly detect the quality information of various aspects of the strip steel, and can also play a guiding role in the production site in real time. It avoids quality objections caused by various quality problems. DETAILED DESCRIPTION

[0012] Due to the fact that the final product is delivered in coils during the strip production process, there are no other means of detecting surface, plate shape, and edge quality items except for the thickness and width measuring instruments online. Therefore, the sickle bend, plate shape, convexity, surface scratches, surface iron oxide scale, head and tail width deformation zone length and other quality problems of the strip cannot be detected after being rolled. Since the production, many quality objections have arisen due to various quality problems. According to statistics, Shanxi Jianlong has 7 quality objections in 2021, of which 3 have quality objections to the sickle bend of the guardrail plate, as shown in the following table:

[0013] Therefore, it is necessary to study the comprehensive detection methods of strip steel quality and establish perfect strip steel detection means to improve the quality of strip steel. It is necessary to detect the quality information of all aspects of strip steel truly and provide guidance to the production site in real time.

[0014] To this end, a new unwinding and rewinding unit was built to conduct comprehensive quality inspection and diagnosis of the steel coil unwinding.

[0015] First: Current status of strip steel quality inspection: 1. After the steel coil is rolled, the two strips at the tail are manually opened to inspect the tail. Generally, the quality of the camber, surface, width, thickness, plate shape, etc. is inspected. The current inspection methods cannot inspect the quality of other positions along the entire length of the steel coil; 2. Description: The width of steel strip less than 600mm is generally called strip steel, the width of steel strip between 600mm and 900mm is generally called medium-wide strip, and the width of steel strip greater than 900mm is generally called coil. The coiling line is equipped with thickness gauge (for measuring thickness), width gauge (for measuring width), convexity gauge (for measuring plate convexity), flatness gauge (for measuring plate shape) and surface detector (for identifying surface quality) to comprehensively monitor and detect the quality, and even to conduct feedback control. Some medium-wide strips are also equipped with thickness gauge, width gauge, convexity gauge, flatness gauge and surface detector to comprehensively monitor and detect the quality. The strip line is only equipped with thickness gauge and width gauge, without any other automation equipment.

[0016] Second: The drawbacks of current strip quality inspection: It is impossible to conduct comprehensive quality inspection on the strip steel throughout its entire length. When quality problems occur, they cannot be discovered in time, resulting in batch quality objections and a lag in equipment improvement and quality rectification.

[0017] Third: Problems to be solved by the present invention: It is necessary to conduct a comprehensive inspection of the quality of the entire length of the strip to avoid quality disputes in batches. Through the quality defects detected, timely adjustments can be made to production, which will play a guiding role in the hidden dangers of the equipment.

[0018] Fourth: Added large-scale tools for comprehensive quality inspection of strip steel (unwinding and rewinding unit: can realize the functions of unwinding, leveling and rewinding of cold and hot strip steel): 1. The strip steel uncoiling unit (large tool) includes a loading car, an uncoiling machine, a material feeding clamping and leveling machine, a transverse shearing machine, a scrap edge coiling machine, a tensioning mechanism, a coiling machine, a disc shear, a material dividing and pressing arm, a discharge car, a movable supporting arm, and a discharge platform.

[0019] 2. The technical parameters of this unit equipment and strip steel are as follows:

[0020] 3. Similar to the original functions of the equipment: Similar equipment is used in the pipe industry for production, to slit or trim the steel strips, and provide raw materials for the pipe making unit; in the cold-rolled strip industry, it is used for production, to slit or trim the steel strips, and then package them for direct external sales; 4. Our company has specially built a new set of such equipment with the function of using it as a quality inspection tool.

[0021] 5. Quality inspection process The strip that needs to be inspected is hoisted onto the loading car, and then sent to the uncoiler reel by the loading car. The reel diameter is tightened, and the head of the steel strip is sent to the feeding clamp and leveling roller with manual assistance. During this process, the machine can be stopped at any time and anywhere to facilitate the inspection of various quality items. The head is fed into the coiler through the tensioning mechanism. After the coil is formed, the main train is removed by the unloading trolley, and the finished product is hoisted to the storage site by an overhead crane.

[0022] Fifth: Objects of use and conditions of use.

[0023] 1. Quality inspection timing: Since the strip steel production line needs to change rolls regularly, there is production instability after roll change, so there are many quality problems. Therefore, the second roll of strip steel after each roll change is put on line for comprehensive quality inspection. If an accident occurs during production, the first roll after the accident is recovered will be inspected for quality.

[0024] 2. Quality inspection frequency: the second roll after rolling, the first roll after accident recovery, and one roll randomly selected during normal production. If any quality problem is found during inspection, one more roll will be tested after adjustment and rectification.

[0025] 3. Quality inspection items: thickness (head, middle and tail thickness), width (head, middle and tail width), sickle bend, plate shape, convexity, surface scratches and surface iron oxide.

Claims

1. An application method of a strip uncoiling unit, characterized in that: The strip steel uncoiling unit includes a loading car, an uncoiling machine, a material feeding clamping and leveling machine, a transverse shearing machine, a scrap edge coiling machine, a tensioning mechanism, a coiling machine, a disc shear, a material dividing and pressing arm, a discharge car, a movable support arm, and a discharge platform. After the strip steel production is completed, the strip steel uncoiling unit is used for quality inspection if any of the following conditions are met: Condition 1: The finishing mill starts producing the second roll of steel strip after each roll change in each roll change cycle; Condition 2: If an accident occurs during each roll-changing cycle of the finishing mill, the first roll of strip produced after the accident shall be resumed; Condition 3: During the roll changing cycle, a roll of strip steel is randomly selected during normal production.

2. The application method of the strip uncoiling unit according to claim 1, characterized in that: During the quality inspection, check the thickness, width, camber, plate shape, convexity, surface scratches, and surface iron oxide scale of the strip. The thickness includes the thickness of the head, middle, and tail of the strip, and the width includes the width of the head, middle, and tail of the strip. When checking the thickness, use a micrometer to check the thickness of the strip at 5 meters from the head, a random position in the middle, and 5 meters from the tail. When checking the width, use a caliper or tape measure to check the width of the strip at 1, 3, 5, and 10 meters from the head, a random position in the middle, and 1, 3, 5, and 10 meters from the tail. When checking the camber, use a caliper or tape measure to check the width of the strip at 5 meters from the head, 2 random positions in the middle, and 1, 3, 5, and 10 meters from the tail. At random positions, sickle bend inspection is carried out at 5 meters from the tail. For each position, a 4-meter-long steel wire is used close to the edge of the strip, and a steel ruler or tape measure is used to measure the position where the distance between the steel wire and the edge is the largest. When checking the plate shape, a 1-meter steel ruler is used to measure the height of the maximum wave position close to the upper surface of the strip edge. When checking the convexity, a micrometer is used to check the irregularities of the head and tail of the strip cut by the cross-cutting unit. When checking the surface scratches, the upper and lower surfaces of the strip are inspected with the naked eye. When checking the surface iron oxide scale, the upper and lower surfaces of the strip are inspected with the naked eye.

3. The application method of the strip uncoiling unit according to claim 1, characterized in that: The quality inspection process is to lift the strip to be inspected onto the loading car, which is then sent to the uncoiler reel. The reel diameter is tightened, and the head of the strip is sent to the feeding clamp and leveling roller with manual assistance. During this process, the machine can be stopped at any time and anywhere to facilitate the inspection of various quality items. The strip head is fed into the coiler through the tensioning mechanism. After the coil is formed, it is moved out of the main train using a unloading car, and the finished product is hoisted to the storage site using an overhead crane.

4. The application method of the strip uncoiling unit according to claim 1, characterized in that: If problems are found during the quality inspection, the unit producing the strip will be adjusted and rectified, and the quality of the subsequent roll of strip with problems will be inspected.

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