A control method of a double-sided guide plate in front of a hot-rolled thin strip coiling machine

Abstract

The application discloses a control method of double-side guide plates in front of a hot-rolled thin strip line coiling machine. The first guide plate, the first pinch roll, the flying shear, the second pinch roll, the second guide plate and the third pinch roll are sequentially arranged in front of the hot-rolled thin strip line coiling machine. The first hot metal detector is arranged in front of the first guide plate. The second hot metal detector is arranged between the first guide plate and the first pinch roll. The third hot metal detector is arranged between the second pinch roll and the second guide plate. The fourth hot metal detector is arranged between the second guide plate and the third pinch roll. The control method can successfully center the strip head in advance through the first guide plate, so that the flying shear can be successfully sheared. The control method can also reduce the generation of problems such as the tower shape, the folded edge and the deviation of the strip steel through the control of the double guide plates. In actual production, the coiling quality of the offline steel coil is improved, and the yield of the strip steel product is also improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automatic control of steel rolling, and relates to a control method for double-sided guide plates in front of a hot rolling thin strip coiler. BACKGROUND

[0002] In a hot rolling thin strip production line, the head of the strip may be stuck, deviated or stacked due to improper control of the guide plates after passing through a plurality of devices, being cut by a flying shear and being thrown by a finishing mill, resulting in tower-shaped and misaligned problems of the final steel coil product. Generally, only one guide plate is provided in front of the coiler of a conventional hot rolling production line, and the single guide plate cannot achieve a good deviation prevention effect. Therefore, a control method for double-sided guide plates in front of a hot rolling thin strip coiler is urgently needed to reduce the problems of tower shape, edge folding and deviation of the strip, and to improve the coiling quality of the steel coil product. SUMMARY

[0003] To solve the above technical problems, the purpose of the present application is to provide a control method for double-sided guide plates in front of a hot rolling thin strip coiler. The head of the strip is successfully centered in advance by controlling the first guide plate, so that the flying shear can cut smoothly. The problems of tower shape, edge folding and deviation of the strip are reduced by controlling the double guide plates. In actual production, the coiling quality of the offline steel coil is improved, and the yield of the strip product is also improved.

[0004] The present application provides a control method for double-sided guide plates in front of a hot rolling thin strip coiler. The first guide plate, the first pinch roll, the flying shear, the second pinch roll, the second guide plate and the third pinch roll are sequentially arranged in front of the coiler. A first hot metal detector is arranged in front of the first guide plate. A second hot metal detector is arranged between the first guide plate and the first pinch roll. A third hot metal detector is arranged between the second pinch roll and the second guide plate. A fourth hot metal detector is arranged between the second guide plate and the third pinch roll. The control method comprises the following steps:

[0005] Step 1: After the control system is ready, when the predetermined position button is pressed or the first hot metal detector detects the steel plate, the opening degree of the first guide plate and the second guide plate is set to the initial opening degree.

[0006] Step 2: When the head of the strip passes through the first hot metal detector and reaches the 1 / 3 position of the first guide plate, the first guide plate performs a short stroke action.

[0007] Step 3: After the head of the strip passes through the first pinch roll and reaches the set position, the first pinch roll is pressed down. When the first pinch roll contacts the strip and reaches the set pressure, the first guide plate performs a second short stroke action.

[0008] Step 4: Recalculate the strip head position according to the flying shear cutting signal, after the strip head passes through the second pinch roll, the second pinch roll is pressed down, when the second pinch roll contacts the strip and reaches the set pressure, the opening of the first guide plate is set to the strip width, and the drive side pressure ring control of the first guide plate is started at the same time;

[0009] Step 5: According to the recalculated strip head position in step 4, after the strip head reaches 1 / 3 of the position of the second guide plate, the second guide plate performs a short stroke action;

[0010] Step 6: According to the recalculated strip head position in step 4, after the strip head passes through the third pinch roll position, the second guide plate performs a second short stroke action;

[0011] Step 7: After the second guide plate reaches the set opening and the coiler reel is wound 2 turns, the opening of the second guide plate is set to the strip width, and the drive side pressure ring control of the second guide plate is put into at the same time;

[0012] Step 8: The rolling mill has no rolling force and the first hot metal detector fails to detect heat, the opening of the first guide plate is set to the one-time short stroke opening setting value;

[0013] Step 9: The rolling mill has no rolling force and the second hot metal detector fails to detect heat, the opening of the first guide plate returns to the initial opening setting value;

[0014] Step 10: The rolling mill has no rolling force and the third hot metal detector fails to detect heat, the opening of the second guide plate is set to the one-time short stroke opening setting value;

[0015] Step 11: The rolling mill has no rolling force and the fourth hot metal detector fails to detect heat, the opening of the second guide plate returns to the initial opening setting value.

[0016] Further, the initial opening of the first guide plate and the second guide plate is expressed by the following formula:

[0017] S1 = S0 + 2S11 + 2S12 + S13

[0018] S2 = S0 + 2S21 + 2S22 + S23

[0019] Wherein, S1 and S2 are the initial opening setting values of the first guide plate and the second guide plate respectively; S0 is the strip width; S11 is the set one-time short stroke distance of the single side guide plate of the first guide plate; S12 is the set two-time short stroke distance of the single side guide plate of the first guide plate; S13 is the adjustment amount of the guide plate gap of the first guide plate; S21 is the set one-time short stroke distance of the single side guide plate of the second guide plate; S22 is the set two-time short stroke distance of the single side guide plate of the second guide plate; S23 is the adjustment amount of the guide plate gap of the second guide plate.

[0020] Further, the first guide plate in step 2 performs a first short stroke action, and the opening degree of the first guide plate is adjusted to SW11:

[0021] SW11=S0+2S12+S13

[0022] Wherein, SW11 is the first guide plate of a first short stroke opening degree set value.

[0023] Further, the first guide plate in step 3 performs a second short stroke action, and the opening degree of the first guide plate is adjusted to SW12:

[0024] SW12=S0+S13

[0025] Wherein, SW12 is the first guide plate of a second short stroke opening degree set value.

[0026] Further, the second guide plate in step 5 performs a first short stroke action, and the opening degree of the second guide plate is adjusted to SW21:

[0027] SW21=S0+2S22+S23

[0028] Wherein, SW21 is the second guide plate of a first short stroke opening degree set value.

[0029] Further, the second guide plate in step 6 performs a second short stroke action, and the opening degree of the second guide plate is adjusted to SW22:

[0030] SW22=S0+S23

[0031] Wherein, SW22 is the second guide plate of a second short stroke opening degree set value.

[0032] Further, the value range of S11 and S21 is 10-25mm; the value range of S12 and S22 is 5-15mm; the value range of S13 and S23 is 1-10mm.

[0033] The control method of the double-sided guide plate in front of the hot rolling thin strip coiling machine has at least the following beneficial effects:

[0034] In the control method of the present application, the first guide plate can guide the strip head to approach the center line position of the guide plate, avoiding the phenomenon of strip head clamping in the flying shear position, and through the simultaneous control of the two guide plates, the deviation of the strip head can be better controlled. After the secondary short stroke of the two guide plates, the gap amount is removed, which can make the strip more close to the center line of the roller, and ensure the better center line consistency of the rolling mill, strip and coiling equipment. The control method of the present application does not completely depend on the heat detection tracking, but tracks through the flying shear cutting completion signal, avoids the false signal of the influence of water vapor on the heat detection, improves the stability of the strip head entering the coiling machine, thereby reducing the occurrence of head tower shape, folded edge and staggered layer, and improving the stability and yield of the production process. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A flow chart of a control method of a double-sided guide plate in front of a hot-rolled thin strip coiling machine in the present application;

[0036] Figure 2 A partial schematic diagram of a hot-rolled thin strip production line in the present application. DETAILED DESCRIPTION

[0037] As shown in Figure 1 , the present application provides a control method of a double-sided guide plate in front of a hot-rolled thin strip coiling machine, the hot-rolled thin strip coiling machine is provided with a first guide plate SG1, a first pinch roll PR1, a flying shear, a second pinch roll PR2, a second guide plate SG2 and a third pinch roll PR3 in front in order; a first hot metal detector HMD1 is arranged in front of the first guide plate SG1, a second hot metal detector HMD2 is arranged between the first guide plate SG1 and the first pinch roll PR1, a third hot metal detector HMD3 is arranged between the second pinch roll PR2 and the second guide plate SG2, and a fourth hot metal detector HMD4 is arranged between the second guide plate SG2 and the third pinch roll PR3, as shown in Figure 2 . The control method comprises the following steps:

[0038] Step 1: After the control system is ready, when the predetermined position button is pressed or the first hot metal detector HMD1 detects the steel plate, the opening degree of the first guide plate SG1 and the second guide plate SG2 is set to the initial opening degree;

[0039] In specific implementation, the initial opening degree of the first guide plate SG1 and the second guide plate SG2 is expressed by the following formula:

[0040] S1=S0+2S11+2S12+S13

[0041] S2=S0+2S21+2S22+S23

[0042] Wherein, S1 and S2 are the initial opening degree setting values of the first guide plate SG1 and the second guide plate SG2 respectively; S0 is the strip width; S11 is the set first guide plate SG1 single side guide plate first short stroke distance; S12 is the set first guide plate SG1 single side guide plate second short stroke distance; S13 is the adjustment amount of the guide plate gap of the first guide plate SG1; S21 is the set second guide plate SG2 single side guide plate first short stroke distance; S22 is the set second guide plate SG2 single side guide plate second short stroke distance; S23 is the adjustment amount of the guide plate gap of the second guide plate SG2.

[0043] Wherein, the value range of S11 and S21 is 10-25mm; the value range of S12 and S22 is 5-15mm; the value range of S13 and S23 is 1-10mm.

[0044] Step 2: When the strip head passes through the first hot metal detector HMD1 and reaches the first guide plate 1 / 3 position, the first guide plate SG1 performs a first short stroke action;

[0045] In specific implementation, the first guide plate SG1 performs a first short stroke action, and the opening degree of the first guide plate SG1 is adjusted to SW11:

[0046] SW11=S0+2S12+S13

[0047] Wherein, SW11 is the first short stroke opening degree setting value of the first guide plate SG1.

[0048] Step 3: After the strip head passes through the first pinch roll PR1 to reach the set position, the first pinch roll PR1 is pressed down, and when the first pinch roll PR1 contacts the strip and reaches the set pressure, the first guide plate SG1 performs a second short stroke action;

[0049] In specific implementation, the first guide plate SG1 performs a second short stroke action, and the opening degree of the first guide plate SG1 is adjusted to SW12:

[0050] SW12=S0+S13

[0051] Wherein, SW12 is the second short stroke opening degree setting value of the first guide plate SG1.

[0052] Step 4: Recalculate the strip head position according to the flying shear cutting completion signal, after the strip head passes through the second pinch roll PR2, the second pinch roll PR2 is pressed down, and when the second pinch roll PR2 contacts the strip and reaches the set pressure, the opening degree of the first guide plate SG1 is set to the strip width, and at the same time the drive side pressure ring control of the first guide plate SG1 is started;

[0053] Step 5: According to the re-calculated strip head position of step 4, after the strip head reaches 1 / 3 of the position of the second guide plate SG2, the second guide plate SG2 performs a short stroke action;

[0054] In specific implementation, the second guide plate SG2 performs a short stroke action, and the opening degree of the second guide plate SG2 is adjusted to SW21:

[0055] SW21=S0+2S22+S23

[0056] wherein SW21 is the set value of the opening degree of the second guide plate SG2 in the short stroke.

[0057] Step 6: According to the re-calculated strip head position of step 4, after the strip head passes through the position of the third pinch roll PR3, the second guide plate SG2 performs a second short stroke action;

[0058] In specific implementation, the second guide plate SG2 performs a second short stroke action, and the opening degree of the second guide plate SG2 is adjusted to SW22:

[0059] SW22=S0+S23

[0060] wherein SW22 is the set value of the opening degree of the second guide plate SG2 in the second short stroke.

[0061] Step 7: After the second guide plate SG2 reaches the set opening degree and the coiler reel is wound with 2 turns, the opening degree of the second guide plate SG2 is set to the strip width, and the drive side pressure ring control of the second guide plate SG2 is controlled to be put into operation.

[0062] Step 8: When the rolling mill has no rolling force and the first hot metal detector HMD1 fails to detect, the opening degree of the first guide plate SG1 is set to the set value of the first short stroke opening degree.

[0063] Step 9: When the rolling mill has no rolling force and the second hot metal detector HMD2 fails to detect, the opening degree of the first guide plate SG1 is restored to the initial opening degree set value.

[0064] Step 10: When the rolling mill has no rolling force and the third hot metal detector HMD3 fails to detect, the opening degree of the second guide plate SG2 is set to the set value of the first short stroke opening degree.

[0065] Step 11: When the rolling mill has no rolling force and the fourth hot metal detector HMD4 fails to detect, the opening degree of the second guide plate SG2 is restored to the initial opening degree set value.

[0066] Brief introduction of process equipment:

[0067] (1) Pre-cutting roller

[0068] It is installed before flying shear, used to transport the rolled strip to flying shear. All 8 rollers are driven by a deceleration motor through chain, realizing collective transmission, the line speed of the roller before flying shear keeps synchronization with the speed of the casting and rolling machine.

[0069] Roller diameter Φ180mm, deceleration motor (JC01-MKL) power 2.2kW, rated speed 1500r / min, deceleration ratio 2.54.

[0070] (2) The first guide plate before flying shear

[0071] It is installed in the roller before flying shear, used to first centering of the rolled strip. The first guide plate is driven by two hydraulic cylinders of operation side and transmission side respectively, moving along the plate width direction, realizing automatic centering. The hydraulic cylinders of both sides are equipped with linear displacement sensor and pressure sensor in the hydraulic valve table, having position control and pressure control functions. Before the opening degree of the first guide plate reaches the limit position, four proximity switches will send signals, protecting the safety of the equipment. In addition, the hydraulic cylinder locks the guide plate for quick replacement.

[0072] (3) The roller after flying shear

[0073] It is installed between flying shear and underground coiler, used to transport the strip. All 8 rollers are driven by a deceleration motor through chain, realizing collective transmission, the line speed of the roller after flying shear keeps synchronization with the speed of the underground coiler.

[0074] Roller diameter Φ180mm, deceleration motor (JG01-MKL) power 2.2kW, rated speed 1500r / min, deceleration ratio 2.54.

[0075] (4) The second guide plate after flying shear

[0076] It is installed in the roller after flying shear, used to second centering of the strip after flying shear and before coiling, that is, the last centering before the strip coiling into finished product coil. The second guide plate is driven by two hydraulic cylinders of operation side and transmission side respectively, moving along the plate width direction, realizing automatic centering. The hydraulic cylinders of both sides are equipped with linear displacement sensor, cooperating with pressure sensor in the hydraulic valve table, having position control and pressure control functions. Before the opening degree of the second guide plate reaches the limit position, four proximity switches will send signals, protecting the safety of the equipment. In addition, the hydraulic cylinder locks the guide plate for quick replacement.

[0077] (5) The first pinch roll before flying shear

[0078] It is installed before flying shear, used to transport the strip into flying shear for shearing. The upper and lower pinch rolls are driven by a deceleration motor separately, the center of the lower pinch roll is fixed, and the upper pinch roll is adjusted by a hydraulic cylinder. The entrance of the pinch roll before flying shear is equipped with double material detection.

[0079] The upper and lower pinch rollers have the same diameter of Φ280mm. Two reduction motors (JE01-MKL) and (JE03-MKL) have the power of 5.5kW, the rated rotating speed of 1000r / min and the reduction ratio of 2.92.

[0080] (6) Second pinch roller after shearing

[0081] The second pinch roller is installed after the flying shear and used for conveying the strip into the 2# guide plate. The upper and lower pinch rollers are driven by two reduction motors respectively. The lower pinch roller is fixed, and the upper pinch roller is adjusted by a hydraulic cylinder.

[0082] The upper and lower pinch rollers have the same diameter of Φ280mm. Two reduction motors have the power of 5.5kW, the rated rotating speed of 1000r / min and the reduction ratio of 2.92.

[0083] (7) Third pinch roller before coiler

[0084] The third pinch roller is installed before the underground coiler. The third pinch roller is used for conveying the strip into the underground coiler and establishing tension. The upper and lower pinch rollers are driven by a motor and a box joint reducer respectively. The lower pinch roller is fixed, and the upper pinch roller is adjusted by a hydraulic cylinder. The hydraulic cylinders on both sides are provided with linear displacement sensors, and the pressure sensors in the hydraulic valve station are used for position control and pressure control. When the upper pinch roller is adjusted to the highest limit position, an approaching switch sends a signal to protect the safety of the equipment.

[0085] The upper roller of the third pinch roller has the roller diameter of Φ600mm, and the lower roller has the roller diameter of Φ300mm. Two transmission motors have the same capacity and the power of 55KW, the rated rotating speed of 950r / min, the upper roller transmission reduction ratio of 5.9843 and the lower roller transmission reduction ratio of 3.037.

[0086] The above description is only the preferred embodiment of the present application, and is not used to limit the idea of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for controlling the double-sided guide plates at the front of a hot-rolled thin strip coiler, characterized in that, A first guide plate, a first pinch roll, a flying shear, a second pinch roll, a second guide plate, and a third pinch roll are sequentially arranged in front of the hot-rolled thin strip coiler. A first hot metal detector is arranged in front of the first guide plate, a second hot metal detector is arranged between the first guide plate and the first pinch roll, a third hot metal detector is arranged between the second pinch roll and the second guide plate, and a fourth hot metal detector is arranged between the second guide plate and the third pinch roll. The control method includes the following steps: Step 1: After the control system is ready, when the pre-positioning button is pressed or the first hot metal detector detects the steel plate, the opening degree of the first guide plate and the second guide plate is set to the initial opening degree. Step 2: When the strip head passes the first hot metal detector and reaches 1 / 3 of the position of the first guide plate, control the first guide plate to perform a short stroke. Step 3: After the strip head passes the first pinch roll and reaches the set position, the first pinch roll presses down. When the first pinch roll contacts the strip and reaches the set pressure, the first guide plate performs a second short stroke action. Step 4: Recalculate the strip head position based on the flying shear shear completion signal. After the strip head passes the second pinch roll, the second pinch roll presses down. When the second pinch roll contacts the strip and reaches the set pressure, the opening of the first guide plate is set to the strip width, and the transmission side pressure ring of the first guide plate is started. Step 5: Based on the recalculated strip head position in Step 4, after the strip head reaches 1 / 3 of the position of the second guide plate, the second guide plate performs a short stroke. Step 6: Based on the recalculated strip head position in Step 4, after the strip head passes the position of the third pinch roll, the second guide plate performs a second short-stroke action. Step 7: After the second guide plate reaches the set opening degree and the coiler drum has wound 2 turns, set the opening degree of the second guide plate to the strip width, and at the same time engage the transmission side pressure ring control of the second guide plate. Step 8: The rolling mill has no biting force and the first hot metal detector fails to detect the steel. The opening degree of the first guide plate is set to its single short-stroke opening degree setting value. Step 9: The rolling mill has no biting force and the second hot metal detector fails to detect the steel. The opening of the first guide plate is restored to the initial opening setting value. Step 10: The mill has no biting force and the third hot metal detector fails to detect the steel. The opening of the second guide plate is set to its single short-stroke opening setting value. Step 11: The rolling mill has no biting force and the fourth hot metal detector fails to detect the steel. The opening of the second guide plate is restored to the initial opening setting value.

2. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 1, characterized in that, The initial opening degree of the first guide plate and the second guide plate is expressed by the following formula: S1 = S0 + 2S11 + 2S12 + S13 S2 = S0 + 2S21 + 2S22 + S23 Wherein, S1 and S2 are the initial opening settings of the first guide plate and the second guide plate, respectively; S0 is the strip width; S11 is the set short stroke distance of one side of the first guide plate; S12 is the set short stroke distance of one side of the first guide plate; S13 is the adjustment amount of the guide plate gap of the first guide plate; S21 is the set short stroke distance of one side of the second guide plate; S22 is the set short stroke distance of one side of the second guide plate; and S23 is the adjustment amount of the guide plate gap of the second guide plate.

3. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 2, characterized in that, In step 2, the first guide plate performs a short-stroke movement, and the opening of the first guide plate is adjusted to SW11: SW11 = S0 + 2S12 + S13 Among them, SW11 is the setting value of the opening degree of the first guide plate in a short stroke.

4. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 2, characterized in that, In step 3, the first guide plate performs a second short-stroke movement, and the opening of the first guide plate is adjusted to SW12: SW12 = S0 + S13 Among them, SW12 is the secondary short-stroke opening setting value of the first guide plate.

5. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 2, characterized in that, In step 5, the second guide plate performs a short-stroke movement, and the opening degree of the second guide plate is adjusted to SW21. SW21 = S0 + 2S22 + S23 Among them, SW21 is the setting value of the opening degree of the second guide plate in a single short stroke.

6. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 2, characterized in that, In step 6, the second guide plate performs a second short-stroke movement, and the opening of the second guide plate is adjusted to SW22. SW22=S0+S23 Among them, SW22 is the secondary short-stroke opening setting value of the second guide plate.

7. The control method for the double-sided guide plates at the front of the hot-rolled thin strip coiler as described in claim 2, characterized in that, The values ​​of S11 and S21 range from 10 to 25 mm; the values ​​of S12 and S22 range from 5 to 15 mm; and the values ​​of S13 and S23 range from 1 to 10 mm.

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