Roll gap calibration and operation method of hot straightening machine

Abstract

The invention discloses a roll gap calibration and operation method of a hot straightening machine, and belongs to the technical field of high-temperature metallurgy. An inlet roll and an outlet roll are adjusted to be lower than a plurality of middle working rolls, and a calibration plate is conveyed between the plurality of middle working rolls and an upper working roll; the height of the upper working roller is adjusted through the oil cylinder adjusting assembly until the upper working roller makes contact with the upper surface of the calibration plate, the thickness of the current middle working roller and the thickness of the upper working roller are the thickness of the calibration plate, the inlet roller is adjusted to make contact with the calibration plate through the height adjusting device, and the outlet roller is adjusted to make contact with the calibration plate through the height adjusting device. According to the method, the phenomenon that the calibration time is influenced by manual adjustment under the condition that the roller diameters of the roller boxes are different can be avoided, calibration can be rapidly completed regardless of the roller diameters of the roller boxes, it is ensured that calibration succeeds after the roller boxes are replaced, the manual adjustment time is shortened, and the calibration efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of high temperature metallurgy, and in particular relates to a roller gap calibration of a hot straightening machine and an operation method thereof. Background Art

[0002] Hot straightening machine is an important equipment for steel straightening. It shapes and corrects the material through the extrusion and straightening force between the upper and lower rollers. In the straightening process, the width of the roller gap directly determines the straightening accuracy, so the roller gap needs to be calibrated to ensure that it is consistent with the set process parameters in actual operation. The calibration process mainly adjusts the roller gap of the upper and lower rollers of the straightening machine to match the calibration plate by setting a calibration plate of standard thickness, and calibrates the height of the inlet and outlet rollers and the point of action of the straightening force. Accurate roller gap calibration is an important prerequisite for ensuring the normal operation of the straightening machine, improving the straightening quality and avoiding material processing defects.

[0003] However, the calibration process of the hot straightening machine in the prior art still has many shortcomings. The traditional calibration method usually requires manual participation, and the roll gap is adjusted by manually adjusting the position of the upper roll box or the lower roll box. However, this method is complicated to operate, inefficient, and easily affected by human errors. The existing calibration method lacks automated adaptability, and repeated calibration is required after frequent replacement of the roll group, further reducing production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a roller gap calibration of a hot straightening machine and an operation method thereof, so as to solve the problem in the prior art that it takes too long to process the coke cake and it is difficult to determine the cause of the coke cake after processing.

[0005] A first aspect of the present invention provides a roll gap calibration of a hot straightening machine and an operating method thereof, a roll gap calibration of a hot straightening machine and an operating method thereof, characterized in that it comprises the following steps:

[0006] S1, adjusting the inlet roll and the outlet roll to be lower than several intermediate working rolls, and sending the calibration plate between several intermediate working rolls and the upper working roll;

[0007] S2. Adjust the height of the upper working roll by the oil cylinder adjustment assembly until it contacts the upper surface of the calibration plate, so that the thickness of the current middle working roll and the upper working roll is the thickness of the calibration plate;

[0008] S3, adjusting the inlet roller to contact the calibration plate through the height adjustment device, and adjusting the outlet roller to contact the calibration plate through the height adjustment device;

[0009] S4. The upper working roll is adjusted again by the oil cylinder adjustment assembly until the height of the upper working roll, the middle working roll, the inlet roll and the outlet roll reaches the hot straightening roll gap position.

[0010] As a further solution of the present invention: in the step S1, the height of the inlet roll and the outlet roll is 4 to 8 mm lower than the height of several intermediate working rolls, specifically 5 mm in this embodiment, and the starting height is dynamically adjusted by the stroke calculation of the height adjustment component to adapt to different equipment states and roll diameters, thereby ensuring that the calibration force is determined by the contact force between the intermediate working roll and the upper working roll, thereby improving the calibration accuracy and avoiding abnormal straightening force.

[0011] As a further solution of the present invention: in the step S2, the cylinder adjustment assembly includes four correction cylinders, the telescopic ends of the four correction cylinders are fixedly connected to the upper roll box, a plurality of intermediate working rolls are arranged below the upper roll box, the four correction cylinders are provided with a first pressure sensor and a first displacement sensor, and the four correction cylinders are provided with a pressure sensor and a displacement sensor; the pressure sensor (used to detect the oil pressure on the piston side and the rod side of the cylinder, and calculate the force of the correction cylinder acting on the upper roll box through the physical formula: F=PS, so as to obtain the straightening force of the several upper working rolls below this position acting on the steel plate, and the pressure sensor is installed on the piston side cylinder wall of the upper roll box and the valve platform of the oil on the piston side and the rod side of the control cylinder.

[0012] The displacement sensor is used to detect the extension length of the cylinder rod side. The correction cylinder is installed inverted (piston side facing up, rod side facing down). When the rod side extends (the displacement sensor detects the extension amount of the rod side), the upper roller box moves downward, so that the change in the straightening roller gap is obtained through the change in the displacement sensor.

[0013] As a further solution of the present invention: in the step S2, the four correction cylinders descend rapidly at a speed of 9 to 10 mm / s until they reach the deceleration position, and then the four correction cylinders descend slowly at a speed of 0.10 to 0.20 mm / s until the upper working roll contacts the upper surface of the calibration plate and enters the force control mode.

[0014] As a further solution of the present invention: in step S2, in the force control mode, the four straightening cylinders are adjusted so that the straightening force they detect reaches 500 kN, so that the thickness of the current middle working roll and the upper working roll is the thickness of the calibration plate.

[0015] As a further solution of the present invention: in the step S2, the thickness of the calibration plate is 99 mm. By adjusting the correction cylinder, the roller gap thickness is made equal to the calibration plate thickness (99 mm). The unified thickness standard avoids the roller gap calibration error caused by the difference in calibration plate thickness.

[0016] As a further solution of the present invention: in the step S3, the height adjustment device includes two adjusting cylinders, the two adjusting cylinders are respectively arranged below the inlet roller and the outlet roller, the telescopic ends of the adjusting cylinders are both provided with a first wedge block, the first wedge block is slidably connected above the second wedge block, the second wedge block is arranged below the lower roller box, the lower roller box is provided with an inlet roller, an outlet roller and a plurality of intermediate working rollers, and the two adjusting cylinders are respectively located below the inlet roller and the outlet roller, and are used to independently adjust the height of the inlet roller and the outlet roller. It is arranged at the telescopic end of the adjusting cylinder and moves up and down with the action of the adjusting cylinder. The second wedge block is slidably connected above the first wedge block and can slide along the inclined surface of the first wedge block to achieve fine-tuning of the height. Ensure that the height of the adjusting cylinder matches the calibration plate and achieves contact with the calibration plate. During the calibration process, ensure that the height of the adjusting cylinder is lower than the intermediate working roller to avoid affecting the force distribution of the calibration plate.

[0017] As a further solution of the present invention: in step S3, the adjusting cylinder under the entrance roller of the adjusting cylinder is adjusted to be telescopic so that the entrance roller is gradually raised to contact the calibration plate, so that the height between the current entrance roller and the middle working roller is 0, and the gap between the entrance roller and the middle working roller is equal to the thickness of the calibration plate (99mm). When the entrance roller gradually approaches the calibration plate, the system monitors the change of the contact force in real time. When the contact force reaches the preset value and causes a change of 0.1mm in the roller gap, the adjustment is stopped and the calibration is completed.

[0018] As a further solution of the present invention: in the step S3, the adjustment cylinder under the outlet roller is adjusted to be telescopic so that the outlet roller is gradually raised to contact the calibration plate, so that the height of the current outlet roller and the middle working roller is 0, indicating that the two are on the same horizontal plane, and the first wedge is driven forward or backward by the telescopic action to adjust the height of the outlet roller. The first wedge moves forward under the drive of the adjustment cylinder, and pushes the second wedge to slide through its inclined surface, indirectly raising or lowering the height of the outlet roller. When the outlet roller gradually approaches the calibration plate, the system monitors the change of the contact force in real time. When the contact force reaches the preset value and causes a change of 0.1mm in the roller gap, the adjustment is stopped and the calibration is completed.

[0019] As a further solution of the present invention: in the step S4, the height of the upper working roll is adjusted by the oil cylinder until the height of the upper working roll is 140 mm with the height of the middle working roll, the inlet roll and the outlet roll, and the upper working roll is raised and lowered by the oil cylinder adjustment assembly to ensure that its height is adjusted to the target position of 140 mm, and the upper working roll is adjusted by 41 mm on the basis of the thickness of the calibration plate to ensure that the adjustment accuracy meets the production requirements, and the height of the upper working roll is adjusted to 41 mm on the basis of the thickness of the calibration plate by the oil cylinder adjustment assembly to ensure that the roller gap of the hot straightening machine reaches the standard height of 140 mm required for production operation, and the height of each working roll is consistent after adjustment to ensure stable operation of the roller gap and avoid equipment problems or process deviations caused by height differences. The automatic adjustment process reduces manual intervention, improves calibration efficiency, simplifies the operation process, and protects the integrity of the equipment and the calibration plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] After the hot straightening calibration begins, the relevant devices reach the starting position, where the starting positions of the inlet and outlet rollers are no longer lowered by a fixed height from the current zero position, but when the height adjustment cylinder is fully retracted, the inlet and outlet rollers are ensured to be lower than the height of the middle working roller, so that no force is generated on the calibration plate during the roll gap calibration process, thereby ensuring the accuracy of the roll gap and the accuracy of the zero position of the inlet and outlet roller heights;

[0022] In addition, the oil cylinder adjustment component adjusts the height of the upper working roll. The oil cylinder adjustment component moves quickly from the initial position to the deceleration position until it contacts the upper surface of the calibration plate. The initial position is adjusted quickly to avoid excessive impact caused by the change in the height of the roller box. After detecting the contact force, it gradually switches to the force control mode to avoid excessive force when switching at the same time. The height of the inlet roller and the outlet roller are adjusted to gradually contact the calibration plate to ensure stability during the calibration process. It can avoid the phenomenon of manual adjustment affecting the calibration time under different roller box diameters. Regardless of the roller box diameter, the calibration can be completed quickly to ensure successful calibration after the roller box is replaced. Reduce the time for manual adjustment and improve calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a front view structural schematic diagram of a roll gap calibration of a hot straightening machine and an operation method thereof;

[0025] Figure 2 A schematic diagram of the overall side structure provided by the present invention;

[0026] Figure 3The present invention provides a flow chart of the steps of roller gap calibration and operation method of a hot straightening machine.

[0027] Markings in the figure: 1. Upper roller box; 11. Upper working roller; 2. Lower roller box; 21. Lower working roller assembly; 211. Inlet roller; 212. Middle working roller; 213. Exit roller; 3. Cylinder adjustment assembly; 31. Correction cylinder; 4. Height adjustment device; 41. First wedge block; 42. Second wedge block; 43. Adjustment cylinder; 5. Calibration plate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-3 As shown, in an embodiment of the present invention, a roll gap calibration of a hot straightening machine and an operation method thereof include the following steps:

[0031] S1, adjust the entrance roller 211 and the exit roller 213 to be lower than the plurality of intermediate working rollers 212, and send the calibration plate 5 between the plurality of intermediate working rollers 212 and the upper working roller 111;

[0032] In this step, the calibration plate 5 is placed between the middle working roll 212 and the upper working roll 211 to ensure that the inlet roll 211 and the outlet roll 213 do not apply force to the calibration plate 5 to reduce interference during the calibration process.

[0033] S2, adjusting the height of the upper working roll 11 by the oil cylinder adjustment assembly 3 until it contacts the upper surface of the calibration plate 5, so that the thickness of the current intermediate working roll 212 and the upper working roll 11 is the thickness of the calibration plate 5;

[0034] In this step, the height of the upper working roll 11 is adjusted by using the cylinder adjustment assembly 3. The cylinder adjustment assembly 3 moves quickly from the initial position to the deceleration position until it contacts the upper surface of the calibration plate 5. The initial position is adjusted quickly to avoid excessive impact force caused by changes in the height of the roll box. After the contact force is detected, it is gradually switched to the force control mode to avoid excessive force during simultaneous switching.

[0035] S3, adjusting the inlet roller 211 to contact the calibration plate 5 through the height adjustment device 4, and adjusting the outlet roller 4 to contact the calibration plate 5 through the height adjustment device 4;

[0036] In this step, the heights of the inlet roller 211 and the outlet roller 213 are adjusted so that they gradually contact the calibration plate 5 to ensure stability during the calibration process.

[0037] S4, adjust the upper working roll 11 again through the oil cylinder adjustment component 3 until the height of the upper working roll 11 and the middle working roll 212, the inlet roll 211 and the outlet roll 213 reaches the hot straightening roll gap position, realize the roll gap adjustment, and complete the calibration. The above steps realize full automatic calibration, avoid manual adjustment, improve efficiency and success rate, and avoid the phenomenon that manual adjustment affects the calibration time under different roll box diameters. Regardless of the roll box diameter, the calibration can be completed quickly to ensure the successful calibration after the roll box is replaced. Reduce the time of manual adjustment and improve the calibration efficiency.

[0038] Furthermore, in step S2, the height of the entrance roller 211 and the exit roller 213 is 4 to 8 mm lower than the height of several intermediate working rollers 212, specifically 5 mm in this embodiment. The height of the entrance roller 211 and the exit roller 213 must be accurately lower than all the intermediate working rollers 212 to avoid interference with the calibration force. The starting height is dynamically adjusted through the stroke calculation of the height adjustment component 4 to adapt to different equipment states and roller diameters, ensuring that the calibration force is determined by the contact force between the intermediate working roller 212 and the upper working roller 11, thereby improving the calibration accuracy and avoiding abnormal straightening force.

[0039] Further, in step S2, the cylinder adjustment assembly 3 includes four correction cylinders 31, and the telescopic ends of the four correction cylinders 31 are fixedly connected to the four corners of the upper roll box 1. The four correction cylinders 31 are provided with pressure sensors and displacement sensors; the pressure sensor (used to detect the oil pressure on the piston side and the rod side of the cylinder, and calculate the force of the correction cylinder 31 acting on the upper roll box 1 through the physical formula: F=PS, so as to obtain the straightening force of several upper working rolls 11 below this position on the steel plate. The specific model of the pressure sensor is (HDA3840A-350-Y24) installed on the piston side cylinder wall of the upper roll box 1 and the valve platform of the oil on the piston side and rod side of the control cylinder.

[0040] The displacement sensor is used to detect the extension length of the cylinder rod side. The specific model is (MTS, RHS0260MD701S1G6100). It is installed on the piston side of the cylinder. The correction cylinder is installed inverted (piston side facing up, rod side facing down). When the rod side extends (the displacement sensor detects the extension amount of the rod side), the upper roller box moves downward, so that the change in the straightening roller gap is obtained through the change in the size of the displacement sensor.

[0041] Further, in step S2, the four correction cylinders 31 descend rapidly at a speed of 9 to 10 mm / s, specifically 9.5 mm / s in this embodiment, until they reach the deceleration position, and then the four correction cylinders 31 slowly descend at a speed of 0.10 to 0.20 mm / s, specifically 0.15 mm / s in this embodiment, until the upper working roll contacts the upper surface of the calibration plate and enters the force control mode. The rapid descent stage is used to quickly move the upper working roll 11 to a position close to the calibration plate 5. Through high-speed action, the invalid travel time is greatly reduced, thereby improving the calibration efficiency.

[0042] When it descends to the roll gap distance of 110mm (at this time, the distance between the upper working roll 11 and several intermediate working rolls 212 is 110mm and the roll gap distance at this time), it enters the slow descending stage, and its speed is 0.15mm / s, ensuring that the upper working roll 11 stably contacts the calibration plate 5. During the slow descending contact process, the contact force is gradually detected and switched to force control to ensure the stability of the force value during the calibration process. When the contact force is detected, the correction cylinder 31 switches from the position control mode to the force control mode, and gradually adjusts the contact force to the calibration force, which can avoid the excessive impact force that may be generated by direct contact with the calibration plate 5 after rapid descent, and avoid the upper roll box 1 from moving quickly during positioning so that some positions are pressed against the calibration plate 5 in advance to generate excessive straightening impact force and cause damage to some support roller bearings.

[0043] Further, in step S2, in the force control mode, the four straightening cylinders 31 are adjusted so that the straightening force they detect reaches 500kN, so that the thickness of the current intermediate working roll 212 and the upper working roll 11 is the thickness of the calibration plate 5; at this time, the four straightening cylinders 31 act synchronously at the same speed and position. The straightening cylinder 31 that detects the contact force first switches to the force control mode and maintains the contact force, and the remaining straightening cylinders 31 continue position control, gradually detect the contact force and switch to the force control mode. After all the straightening cylinders 31 enter the force control mode, the straightening force is uniformly adjusted to 500kN to ensure that the thickness of the intermediate working roll 212 and the upper working roll 11 is equal to the thickness of the calibration plate 5. In the position control mode, the four straightening cylinders 31 act at the same speed and position. Once a certain straightening cylinder 31 detects the contact force, it immediately switches from the position control mode to the force control mode and maintains the contact force. The other straightening cylinders 31 continue to act in the position control mode until the contact force is detected one by one and switched to the force control mode. The independent switching mode allows the straightening cylinders 31 to gradually switch to force control, avoiding the situation where the force value of a certain straightening cylinder 31 is too large (close to or exceeds 1500kN) while other straightening cylinders 31 have not detected the contact force, reducing manual intervention and adjustment of position offset values, and making the calibration process more automated. In the force control mode, the straightening cylinders 31 are synchronously adjusted to the target straightening force (500kN) to ensure the accuracy and consistency of the calibrated thickness.

[0044] Furthermore, in step S2, the thickness of the calibration plate 5 is 99 mm, and the calibration plate 5 is placed between the middle working roll 212 and the upper working roll 11. By adjusting the correction cylinder 31, the roll gap thickness is made equal to the thickness of the calibration plate 5 (99 mm). The unified thickness standard avoids the roll gap calibration error caused by the thickness difference of the calibration plate 5.

[0045] In one embodiment, in step S3, the height adjustment device includes two adjustment cylinders 43, which are respectively arranged below the inlet roller 211 and the outlet roller 213. The telescopic ends of the adjustment cylinders 43 are both provided with first wedges 41, and the first wedges 41 are slidably connected with the second wedges 42 above. The second wedges 42 are arranged below the lower roller box 2, and the inlet roller 211, the outlet roller 213 and a plurality of intermediate working rollers 212 are arranged above the lower roller box 2. The two adjustment cylinders 43 are respectively located below the inlet roller 211 and the outlet roller 213, and are used to independently adjust the height of the inlet roller 211 and the outlet roller 213. The second wedge 42 is arranged at the telescopic end of the adjustment cylinder 43 to adjust the movement of the first wedge 4, and is slidably connected above the first wedge 41, and can slide along the inclined surface of the first wedge 41 to achieve fine-tuning of the height, so as to ensure that the height of the adjustment cylinder 43 matches the calibration plate 5 and achieves contact with the calibration plate 5. During the calibration process, ensure that the height of the adjustment cylinder 43 is lower than the middle working roller 11 to avoid affecting the force distribution of the calibration plate 5.

[0046] Further, in step S3, the adjusting cylinder 43 is adjusted to extend and retract so that the entrance roller 211 gradually rises and contacts the calibration plate 5, so that the current height of the entrance roller 211 and the intermediate working roller 212 is 0. The adjusting cylinder 43 drives the entrance roller 211 to rise through the second wedge block 42 through the telescopic action, and gradually contacts the calibration plate 5. The height of the entrance roller 211 and the intermediate working roller 212 is 0, indicating that the two are on the same horizontal plane, and the roller gap between the entrance roller 211 and the intermediate working roller 212 is equal to the thickness of the calibration plate (99mm). When the entrance roller 211 gradually approaches the calibration plate 5, the system monitors the change of the contact force in real time. When the contact force reaches the preset value and causes a change of 0.1mm in the roller gap, the adjustment is stopped and the calibration is completed.

[0047] In one embodiment, in step S3, the adjusting oil cylinder 43 below the outlet roller 213 is adjusted to extend and retract so that the outlet roller 213 is gradually raised to contact the calibration plate 5, so that the height between the current outlet roller 213 and the intermediate working roller 212 is 0. The adjusting oil cylinder 43 is located below the outlet roller 213, and drives the first wedge block 41 forward or backward through the telescopic action to adjust the height of the outlet roller 213. The first wedge block 41 moves forward under the drive of the adjusting oil cylinder 31, and pushes the second wedge block 42 to slide through its inclined surface, indirectly raising or lowering the height of the outlet roller 213. When the outlet roller 213 gradually approaches the calibration plate 5, the system monitors the change of the contact force in real time. When the contact force reaches the preset value and causes a change of 0.1mm in the roller gap, the adjustment is stopped to complete the calibration.

[0048] In one embodiment, in step S4, the height of the upper working roll 11, the middle working roll 212, the inlet roll 211 and the outlet roll 213 is 140 mm. The upper working roll 11 is raised and lowered by the oil cylinder adjustment component 3 to ensure that its height is adjusted to the target position of 140 mm. The upper working roll 11 is adjusted by 41 mm on the basis of the thickness of the calibration plate 5 to ensure that the adjustment accuracy meets the production requirements. The oil cylinder adjustment component 3 is used to adjust the height of the upper working roll 11 to 41 mm added on the basis of the thickness of the calibration plate 5 to ensure that the roller gap of the hot straightening machine reaches the standard height of 140 mm required for production operation. After adjustment, the heights of the working rolls are consistent to ensure stable operation of the roller gap and avoid equipment problems or process deviations caused by height differences. The automatic adjustment process reduces manual intervention, improves calibration efficiency, simplifies the operation process, and protects the integrity of the equipment and the calibration plate.

[0049] After the roller box is replaced or the roller diameter changes, the correction cylinder 31 is automatically canceled from the initial position to the deceleration position. The straightening force is reset to zero directly from the starting position and then starts to decelerate and approach the calibration plate to detect the contact force, thereby avoiding rapid movement during position control. Due to the change in the height of the upper roller box 1, excessive straightening impact force is generated to damage the supporting roller bearings of the roller box. Under any roller box diameter size, the upper roller box 1 can be prevented from moving rapidly during positioning, causing some positions to be pressed to the calibration plate in advance, resulting in excessive straightening impact force and damage to some supporting roller bearings.

[0050] The process of switching the action of the correction cylinder 31 from position control to force control mode is that after one of the correction cylinders 31 detects the contact force, the correction cylinder 31 switches to force control and maintains the contact force, and waits for other hydraulic cylinders to gradually detect the contact force before switching to force control mode accordingly. That is, in the process of switching from position to force control, the four correction cylinders 31 are controlled independently, and then maintain the contact force, and wait for all four correction cylinders 31 to switch to force control, and then the force is adjusted to the calibration force synchronously, so as to avoid the calibration failure caused by excessive force of some correction cylinders 31 when switching at the same time, and to avoid the difference before and after the roller box is replaced. When all are switched to force control at the same time, the deviation of the straightening force is large, which requires multiple manual interventions to ensure that the calibration is passed;

[0051] It can avoid the phenomenon that the straightening force is too large to damage the support roller bearing and the calibration time is affected by manual adjustment under different roller box diameters, thereby ensuring that the calibration process is fully automatic except for the confirmation of the calibration plate, and realizing the one-time successful calibration of the straightening machine roll gap after the roller box is replaced.

[0052] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A roll gap calibration of a hot straightening machine and an operation method thereof, characterized in that: The following steps are involved: S1, adjusting the inlet roll and the outlet roll to be lower than several intermediate working rolls, and sending the calibration plate between several intermediate working rolls and the upper working roll; S2. Adjust the height of the upper working roll by the oil cylinder adjustment assembly until it contacts the upper surface of the calibration plate, so that the thickness of the current middle working roll and the upper working roll is the thickness of the calibration plate; S3, adjusting the inlet roller to contact the calibration plate through the height adjustment device, and adjusting the outlet roller to contact the calibration plate through the height adjustment device; S4. The upper working roll is adjusted again by the oil cylinder adjustment assembly until the height of the upper working roll, the middle working roll, the inlet roll and the outlet roll reaches the hot straightening roll gap position.

2. A roll gap calibration and operation method of a hot straightening machine according to claim 1, characterized in that: In the step S1, the height of the inlet roll and the outlet roll is 4-8 mm lower than the height of several intermediate working rolls.

3. A roll gap calibration and operation method of a hot straightening machine according to claim 1, characterized in that: In step S2, the cylinder adjustment assembly includes four correction cylinders, the telescopic ends of the four correction cylinders are fixedly connected to an upper roller box, a plurality of intermediate working rollers are arranged below the upper roller box, and a first pressure sensor and a first displacement sensor are arranged on the four correction cylinders.

4. A roll gap calibration and operation method of a hot straightening machine according to claim 3, characterized in that: In step S2, the four correction cylinders descend rapidly at a speed of 9 to 10 mm / s until they reach the deceleration position, and then the four correction cylinders descend slowly at a speed of 0.10 to 0.20 mm / s until the upper working roller contacts the upper surface of the calibration plate and enters the force control mode.

5. A roll gap calibration and operation method of a hot straightening machine according to claim 4, characterized in that: In step S2, in the force control mode, the four straightening cylinders are adjusted so that the straightening force detected by them reaches 500 kN, so that the thickness of the current middle working roll and the upper working roll is the thickness of the calibration plate.

6. A roll gap calibration and operation method of a hot straightening machine according to claim 5, characterized in that: In the step S2, the thickness of the calibration plate is 99 mm.

7. A roll gap calibration and operation method of a hot straightening machine according to claim 1, characterized in that: In step S3, the height adjustment device includes two adjusting cylinders, which are respectively arranged below the inlet roller and the outlet roller, and the telescopic ends of the adjusting cylinders are each provided with a first wedge block, a second wedge block is slidably connected above the first wedge block, and the second wedge block is arranged below the lower roller box, and the inlet roller, the outlet roller and a plurality of intermediate working rollers are arranged above the lower roller box.

8. A roll gap calibration and operation method of a hot straightening machine according to claim 7, characterized in that: In step S3, the adjusting cylinder below the entrance roller of the adjusting cylinder is adjusted to extend and retract so that the entrance roller is gradually raised to contact the calibration plate, so that the height between the current entrance roller and the middle working roller is 0.

9. A roll gap calibration and operation method of a hot straightening machine according to claim 8, characterized in that: In step S3, the regulating cylinder below the outlet roller is adjusted to extend and retract so that the outlet roller is gradually raised to contact the calibration plate, so that the height between the current outlet roller and the middle working roller is 0.

10. According to the method for calibrating the roll gap of a hot straightening machine and the method for operating the same, in step S4, the height of the upper working roll of the assembly is adjusted by the oil cylinder until the height of the upper working roll and the height of the middle working roll, the inlet roll and the outlet roll are 140 mm.

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