CN114522986B - Roll gap adjusting structure and method for pinch rolls of hot rolling box - Google Patents
Roll gap adjusting structure and method for pinch rolls of hot rolling box Download PDFInfo
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- CN114522986B CN114522986B CN202210304398.2A CN202210304398A CN114522986B CN 114522986 B CN114522986 B CN 114522986B CN 202210304398 A CN202210304398 A CN 202210304398A CN 114522986 B CN114522986 B CN 114522986B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a hot rolling box pinch roll gap adjusting structure and an adjusting method, wherein the adjusting structure comprises a hot rolling box frame, a pinch roll swing arm is arranged on the upper side of the hot rolling box frame, a stop roll, an upper pinch roll and an upper straightening roll are arranged at the bottom of the pinch roll swing arm, a lower pinch roll and a lower straightening roll are arranged on the hot rolling box frame, a composite hydraulic servo cylinder is arranged on two sides of the pinch roll swing arm, each composite hydraulic servo cylinder comprises a hydraulic servo cylinder and a hydraulic buffer cylinder, a hydraulic servo cylinder displacement sensor is arranged at the hydraulic servo cylinder, one side of a rodless cavity of the hydraulic servo cylinder is movably connected with the hot rolling box frame, a piston rod on one side of a rod cavity is connected with a piston rod on one side of a rod cavity of the hydraulic buffer cylinder, one side of the rodless cavity of the hydraulic buffer cylinder is hinged with the pinch roll swing arm, the hydraulic buffer cylinder is connected with an energy accumulator, and the hydraulic servo cylinder, the buffer cylinder and the energy accumulator are respectively connected with a hydraulic system. The invention overcomes the defects of the existing hot coil box through small changes, and realizes normal uncoiling, straightening and conveying of intermediate blanks.
Description
Technical Field
The invention belongs to the technical field of hot rolled plate machinery, and particularly relates to a roll gap adjusting structure and a roll gap adjusting method of a pinch roll of a hot rolling box.
Background
In the hot rolled plate production line, a hot coil box is used as equipment for coiling and uncoiling intermediate billets, is positioned at the upstream of a secondary descaling box and a crop flying shear after a roughing mill, and is important process equipment for reducing the load of a finishing mill group, breaking secondary oxidized iron scales on the surface of strip steel, balancing the temperature difference between the head and the tail of the intermediate billets and being beneficial to the production of limit specifications. The qualified intermediate billets rolled by the roughing mill are conveyed to an inlet side guide plate of the hot rolling box by a roller way, enter the hot rolling box after being centered by the side guide plate, are rolled into intermediate billets by the hot rolling box, and are subjected to heat preservation and soaking at the hot rolling box in a steel coil form so as to reduce the temperature drop of strip steel and reduce the temperature difference between the head and the tail of a slab; and then the hot rolling box opens the intermediate blank roll, and the head of the strip steel is led out and then is conveyed to a head-cutting flying shear, the irregular head is sheared off, and then the strip steel is subjected to secondary oxide scale removal by high-pressure water and enters a finishing mill group for rolling. When coiling, the intermediate blank forms a coreless coil through an inlet roller, a bending roller unit, a coil supporting roller unit, a forming roller and the like of the hot coil box; during uncoiling, the coreless coil is uncoiled by pressing down the head part (the tail part of the intermediate blank) by an uncoiling arm, then passes through a coil supporting roller, is straightened by a pinch roller, and then is conveyed to a flying shear and a finish rolling direction.
The existing hot rolling box pinch roll structure is shown in fig. 1, and is a double-servo hydraulic cylinder swing arm type mechanism, the main structure of the mechanism is that a lower pinch roll 5 and a lower straightening roll 8 are fixedly arranged on a hot rolling box frame 7, a stop roll 2, an upper pinch roll 4 and an upper straightening roll 9 are arranged on a pinch roll swing arm 1, the pinch roll swing arm 1 is hinged to the upper side of the hot rolling box frame 7, two servo cylinders 6 are respectively arranged on two sides of the pinch roll swing arm 1, a servo cylinder displacement sensor is arranged beside each servo cylinder 6, one end of each servo cylinder 6 is respectively fixed on the hot rolling box frame 7, the other end of each servo cylinder is hinged to the middle of the pinch roll swing arm 1, and the hot rolling box frame 7, the pinch roll swing arm 1 and the two servo cylinders 6 form a four-bar crank mechanism. The front stop roller 2 is used to prevent false entry of the second roll when the previous roll has not yet ended. After the head of the uncoiled intermediate billet 3 enters the upper pinch roll 4 and the lower pinch roll 5, a rod cavity of the servo oil cylinder 6 is filled with oil, and the upper pinch roll 4 is pressed against the lower pinch roll 5 by the action of the four-rod crank mechanism through the pinch roll swing arm 1, so that the intermediate billet 3 is ensured to be positioned accurately and guided smoothly; simultaneously, the rear upper straightening roller 9 also falls down together with the frame of the pinch roller swing arm 1 to play a role in straightening heads with the lower pinch roller 5 and the lower straightening roller 8; when the rodless cavity of the servo oil cylinder 6 is communicated, the four-bar crank mechanism acts to enable the upper pinch roll 4 to be in a lifting state away from the lower pinch roll 5 through the pinch roll swinging arm 1. Fig. 2 shows a control diagram of a conventional hot rolling box pinch roll hydraulic system, each servo cylinder 6 is matched with 1 servo valve 13, 1 three-position four-way reversing valve 15 and 1 two-position four-way reversing valve 16 to form a hydraulic control unit, a system pressure source or a control pressure source is respectively connected with the servo valve 13 of each hydraulic control unit and the oil inlet of the three-position four-way reversing valve 15, two working ports of the servo valve 13 and the three-position four-way reversing valve 15 of the hydraulic control unit are respectively connected with a rod cavity and a rodless cavity of the servo cylinder 6, hydraulic control check valves 14 are respectively arranged on connected pipelines, meanwhile, the hydraulic control check valves 3 are connected into the two-position four-way reversing valves 16 through pipelines, the two-position four-way reversing valves 16 are connected with the control pressure source, and meanwhile, overflow valves 12 are also arranged on the pipelines connected with rod cavities of the servo cylinders 6.
The pinch roll unit in the hot rolling box plays an important role, so that on one hand, the intermediate blank after being unrolled is clamped, the intermediate blank is ensured to be unrolled successfully and is accurately centered and guided into the head cutting flying shear and the finishing mill, and on the other hand, the head of the intermediate blank is straightened, and the intermediate blank is ensured to be smoothly guided into the head cutting shear and the descaling machine. However, during the use process of the hot rolling box, uncoiling and deviation often occur, so that the cutting head is continuously sheared, the finish rolling machine is in an off-centered rolling state before biting steel, and the middle blank is in a warping and curling state during the straightening process of an outlet of the hot rolling box, so that the condition that the middle blank subsequently and smoothly enters secondary descaling is affected. The specific reasons are as follows:
1. during uncoiling, the head of the intermediate blank is subjected to downward pressure straightening through the pinch rolls, and during straightening, if roll gaps at two sides are inclined, transverse acting force can be generated on the head of the intermediate blank, and side shifting influence can be generated on the running of the head of the strip steel. FIG. 3 is a diagram showing the pressure and the elongation of the hydraulic cylinders at two sides when the strip steel head is straightened by the pinch rolls in the uncoiling process, which can intuitively reflect the fluctuation of the roll gaps at two sides along with the fluctuation of the pressure and indirectly reflect whether the two sides are pressed against and inclined.
2. The upper pinch roll and the upper straightening roll are simultaneously arranged on the same swing arm, and as the temperature difference of the head of the intermediate blank after uncoiling can generate the phenomenon of head warping, in order to ensure that the shape of the head can be smoothly led into a head cutting shear, the roll gap of the straightening roll is required to be reduced to enlarge the straightening capability, so that the clamping force in the clamping and conveying process can be greatly increased, when the clamping force is larger than the set value of the overflow valve 12 in FIG. 2, the overflow valve can be automatically and rapidly opened to form transition overflow, the roll gap value is instantaneously larger than the thickness of the intermediate blank, the pressure closed loop is not regulated at the moment, the phenomenon of sideslip of the intermediate blank which is not clamped is formed, and the strip steel is deviated; meanwhile, the set values of the pinch roll and the straightening roll are required to be high, so that frequent adjustment of the servo system is formed.
3. Because the shape of the intermediate billet is not very flat after being uncoiled, local buckling and side waves often occur, which requires that the roll gap value be greater in the clamping and straightening processes. At this time, the instantaneous overflow amount of the overflow valve 12 in fig. 2 is many times that of the normal condition, the pressure generated by the rapidly increased flow is far greater than the set value, the clamping force is suddenly increased, the rapidly increased clamping force can damage the swing arm of the pinch roll, and the overflow valve can excessively overflow under the working condition, so that the difficulty of leading in the pinch roll and the failure of uncoiling occur.
4. If the preset roll gap of the straightening roll feeding device is too small, the original roll gap cannot be recovered no matter how the servo system is used for adjusting, the overflow valve of the system frequently acts, the temperature of the hot rolling box hydraulic system is kept to be close to 50 ℃ for a long time to operate, the internal temperature of the control valve is higher than 65 ℃ for a long time due to the high temperature of the system, the oil liquid of the hydraulic system is blackened and deteriorated after being used for a period of time, the lubricating performance is rapidly reduced, and the hydraulic elements of the system frequently have blocking.
5. The existing pinch roll swing arm is of an integral structure, two sides of the swing arm are respectively provided with a plurality of hinge points, no matter what type of hinge structure is adopted, gaps are necessarily reserved between friction pairs, the gaps are required to swing, and the size of the gaps determines the size of the swing amplitude.
Disclosure of Invention
Aiming at the technical problems in the background art, the invention provides a hot rolling box pinch roll gap adjusting structure and an adjusting method, which effectively solve the problems that the roll gap of an uncoiled intermediate blank is changed greatly due to buckling, side waves and the like, so that the hydraulic servo frequency response is too fast, the flow is not matched, an overflow valve frequently acts, and the different change trends of the pinch roll gap and the straightening roll gap are considered, meanwhile, the constant clamping force of a remote and rapid preset roll gap and a hydraulic system is realized, the single side of a hydraulic cylinder is adjustable (preset roll gap), and the maintenance of the pinch roll (millimeter level) under the asymmetric abrasion condition is reduced; in addition, the invention has small change when applied to the existing system, and is suitable for the situation that the pressure adjustment frequently fluctuates due to the change of the roll gap value caused by the existence of gaps among friction pairs of all hinge points of the pinch roll.
The technical scheme for solving the technical problems is as follows:
the invention discloses a hot rolling box pinch roll gap adjusting structure, which comprises a hot rolling box frame, wherein a pinch roll swing arm is movably arranged on the upper side of the hot rolling box frame, a stop roll, an upper pinch roll and an upper straightening roll are respectively arranged at the bottom of the pinch roll swing arm, a lower pinch roll and a lower straightening roll are respectively arranged at positions corresponding to the upper pinch roll and the upper straightening roll on the hot rolling box frame, the hot rolling box pinch roll gap adjusting structure further comprises compound hydraulic servo cylinders respectively arranged at two sides of the pinch roll swing arm, each compound hydraulic servo cylinder comprises a hydraulic servo cylinder and a hydraulic buffer cylinder, a hydraulic servo cylinder displacement sensor is arranged at the hydraulic servo cylinder, one side of a rodless cavity of the hydraulic servo cylinder is movably connected with the hot rolling box frame, a piston rod at one side of a rod cavity of the hydraulic servo cylinder is fixedly connected with a piston rod at one side of the rod cavity of the hydraulic buffer cylinder, one side of the rodless cavity of the hydraulic buffer cylinder is hinged with the middle position of the pinch roll, the rod cavity of the hydraulic buffer cylinder is connected with an energy accumulator, and the rod cavity of the hydraulic buffer cylinder and the energy accumulator is respectively connected with a hydraulic system.
Further, the stroke of the hydraulic buffer cylinder is 10mm.
Further, the rod cavities of the two hydraulic buffer cylinders are commonly connected with an energy accumulator.
The invention discloses a hot rolling box pinch roll gap adjusting method, which is carried out by utilizing the hot rolling box pinch roll gap adjusting structure in the technical scheme, and comprises the following steps:
s1, setting a pinch roll gap value according to the technological requirement of a hot rolling box for clamping an intermediate blank, determining the maximum value and the minimum value of feedback values of hydraulic servo cylinder displacement sensors according to the travel range of a hydraulic servo cylinder in a hot rolling box pinch roll gap adjusting structure, feeding oil to rod cavities of two hydraulic servo cylinders through a hydraulic system, driving an upper pinch roll to move downwards by a pinch roll swing arm under the action of the hydraulic servo cylinders, enabling the upper pinch roll and a lower pinch roll to press against and rotate at a set speed, taking the position as a starting point of feedback values of the hydraulic servo cylinder displacement sensors when the feedback values of the hydraulic servo cylinder displacement sensors reach the predetermined minimum value, feeding oil to rodless cavities of the hydraulic servo cylinders through the hydraulic system at the same time, stopping feeding oil to the hydraulic servo cylinders when the feedback values of the hydraulic servo cylinder displacement sensors reach the set roll gap value, and locking a hydraulic loop of the hydraulic servo cylinders;
s2, after the roll gap of the pinch roll is adjusted, verifying the roll gap of the straightening roll by using the same pressing force as the pinch roll through the thickness of the calibration plate, and adjusting in a manner of adding and subtracting gaskets if the roll gap of the straightening roll is inconsistent with the roll gap of the pinch roll;
s3, after the intermediate blank is uncoiled, clamped and separated from the upper pinch roll and the lower pinch roll, oil is fed to rodless cavities of the two hydraulic servo cylinders through a hydraulic system, the upper pinch roll is driven to move upwards by the swing arm of the pinch roll under the action of the hydraulic servo cylinders, when the feedback value of the displacement sensor of the hydraulic servo cylinders reaches a determined maximum value, the upper pinch roll is completely lifted, and at the moment, the hydraulic system stops feeding oil to the hydraulic servo cylinders;
and S4, simultaneously pumping oil to rod cavities of the two hydraulic servo cylinders again through a hydraulic system, driving the upper pinch roll to move downwards by the pinch roll swing arm under the action of the hydraulic servo cylinders, indicating that the upper pinch roll is pressed down in place again when the feedback value of the displacement sensor of the hydraulic servo cylinders reaches a set roll gap value, stopping pumping oil to the hydraulic servo cylinders through the hydraulic system, locking a hydraulic loop of the hydraulic servo cylinders, and then, recycling the steps.
Further, the pinch roll gap value is determined according to the ideal value of the pinch roll gap of the upper pinch roll and the lower pinch roll when the intermediate blank is to be clamped in the hot rolling box under ideal conditions, and the pinch roll gap value is smaller than or equal to the ideal value.
Further, the degree of synchronization of the actions of the two hydraulic servo cylinders cannot exceed 1-2 mm.
Compared with the prior art, the roll gap adjusting structure and the roll gap adjusting method for the pinch roll of the hot rolling box have the following beneficial effects:
1. the problem of asymmetric clamping of the eccentric-wear rollers is solved, the service lives of the pinch rollers and the straightening rollers are prolonged, the maintenance cost is reduced, and the maintenance period of each roller is improved to more than six months from three months;
2. the conditions of thickness change, pinch roll clamping failure and middle blank deviation are avoided, and the conditions of inaccurate shearing and positioning of the head-cutting flying shears are greatly improved;
3. by the arrangement of the compound hydraulic servo cylinder (especially the hydraulic buffer cylinder), the roll gaps of the pinch rolls and the straightening rolls at the two sides are subjected to micro self-adaptive adjustment, frequent response occurrence of a servo system is reduced, the output pressure of an overflow valve is stable, and the occurrence rate of unsuccessful uncoiling is reduced;
4. the thickness of the preset roll gap smaller than the change of the intermediate blank of the strip steel is eliminated, so that the original roll gap cannot be recovered no matter how the servo system adjusts, and the intermediate blank impacts the pinch roll swing arm to damage the frame.
Drawings
FIG. 1 is a simplified schematic diagram of a pinch roll of a conventional hot coil box;
FIG. 2 is a schematic diagram of a prior art hot box pinch roll hydraulic system control;
FIG. 3 is a schematic diagram of the pinch roll gap and press relationship of a conventional hot box pinch roll;
FIG. 4 is a schematic view of the pinch rolls of the hot coil box in the present invention;
FIG. 5 is a schematic diagram of the control of the hot box pinch roll hydraulic system of the present invention;
FIG. 6 is a diagram showing the control relationship between the control system and each of the hydraulic servo cylinder displacement sensors, and each of the valve elements in the present invention;
in the figure: 1. swing arms of pinch rolls; 2. a stopper roller; 3. an intermediate blank; 4. an upper pinch roll; 5, feeding pinch rolls; 6. a servo cylinder; 7. a hot roll box frame; 8. a lower straightening roller; 9. an upper straightening roller; 10. a hydraulic buffer cylinder; 11. an accumulator; 12. an overflow valve; 13. a servo valve; 14. a hydraulically controlled one-way valve; 15. a three-position four-way reversing valve; 16. a two-position four-way reversing valve; 17. a one-way valve; 18. a hydraulic servo cylinder displacement sensor; 19. and a controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in the specification and claims of the present published patent application, "upper", "lower", "left", "right", "front", "rear", etc. are used only to indicate relative positional relationships, which change when the absolute position of the object to be described changes; the terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Example 1:
as shown in fig. 4-6, the roll gap adjusting structure of the pinch roll of the hot rolling box comprises a hot rolling box frame 7, wherein a pinch roll swing arm 1 is movably arranged on the upper side of the hot rolling box frame 7, a stop roll 2, an upper pinch roll 4 and an upper straightening roll 9 are respectively arranged at the bottom of the pinch roll swing arm 1, and a lower pinch roll 5 and a lower straightening roll 8 are respectively arranged on the hot rolling box frame 7 at positions corresponding to the upper pinch roll 4 and the upper straightening roll 9; the hot rolling box pinch roll gap adjusting structure further comprises compound hydraulic servo cylinders respectively arranged on two sides of the pinch roll swing arm 1, each compound hydraulic servo cylinder comprises a hydraulic servo cylinder 6 and a hydraulic buffer cylinder 10, a hydraulic servo cylinder displacement sensor 18 (the stroke of a measuring cylinder through the displacement sensor is of conventional design, the hydraulic servo cylinder displacement sensor 18 is not shown in fig. 4) for measuring the stroke of the hydraulic servo cylinder 6 is arranged at the position of the hydraulic servo cylinder 6, one side of a rodless cavity of the hydraulic servo cylinder 6 is movably connected with the hot rolling box frame 7, a piston rod on one side of a rod cavity of the hydraulic servo cylinder is fixedly connected with a piston rod on one side of the rod cavity of the hydraulic buffer cylinder 10, one side of the rodless cavity of the hydraulic buffer cylinder 10 is hinged with the middle position of the pinch roll swing arm 1, the rod cavity of the hydraulic buffer cylinder 10 is connected with an energy accumulator 11, and the rod cavity of the hydraulic servo cylinder 6, the rod cavity of the hydraulic buffer cylinder 10 and the energy accumulator 11 are respectively connected with a hydraulic system of the hot rolling box. According to the invention, the hydraulic servo cylinders 6 in the original system are replaced by the compound hydraulic servo cylinders, the two hydraulic servo cylinders 6 are controlled by the hydraulic system without rod cavities, and the accurate preset roll gap can be realized by remote control by means of the hydraulic servo cylinder displacement sensor 18; fig. 5 shows a control schematic diagram of an improved hot rolling box pinch roll hydraulic system, the hot rolling box hydraulic system comprises a system pressure source and a control pressure source, the system pressure source and the control pressure source are external hydraulic sources, hydraulic stations and the like, a hydraulic servo cylinder 6 and a hydraulic buffer cylinder 10 in each side of a composite hydraulic servo cylinder of a pinch roll swing arm 1 are matched with 1 servo valve 13, 1 three-position four-way reversing valve 15 and 1 two-position four-way reversing valve 16 to form a hydraulic control unit, the system pressure source or the control pressure source is respectively connected with the servo valve 13 of each hydraulic control unit and the oil inlet of the three-position four-way reversing valve 15, the two working ports of the servo valve 13 and the three-position four-way reversing valve 15 of the hydraulic control unit are respectively connected with a rod cavity and a rodless cavity of the hydraulic servo cylinder 6, hydraulic control one-way valves 14 are respectively arranged on connected pipelines, meanwhile, the hydraulic control check valve 3 is connected with the two-position four-way reversing valve 16 through a pipeline, the two-position four-way reversing valve 16 is connected with a control pressure source, the connection or the disconnection of hydraulic oil with a rod cavity and a rodless cavity of the hydraulic servo cylinder 6 is controlled through the servo valve 13, the rod cavity of the buffer hydraulic cylinder 10 and the energy accumulator 11 are simultaneously connected with a system pressure source, the pressure source of the hydraulic system can be adjusted to a set value according to the technological requirements of the intermediate blank 3 to be clamped, hydraulic oil is sent into the rod cavity of the buffer hydraulic cylinder 10 and the energy accumulator 11, each servo valve 13, the three-position four-way reversing valve 15 and the two-position four-way reversing valve 16 are respectively connected with a controller 19 of a hot rolling box hydraulic system and controlled by the controller 19 according to requirements, the hydraulic system of the hot rolling box is the existing control system of the hot rolling box, and the replacement device according to the invention makes an adaptive modification of the corresponding program or parameters in the controller 19.
Further, in this embodiment, the rod chambers of the two hydraulic buffer cylinders 10 are connected together to one accumulator 11, so that the fluctuation of pressure can be made smaller.
In this embodiment, the setting of the buffer hydraulic cylinder 10 realizes the constant clamping force of the hydraulic system, the hydraulic buffer cylinder 10 is a micro cylinder, the stroke is smaller, the general stroke is about 10mm, the rod cavity of the hydraulic buffer cylinder 10 is provided with an independent energy accumulator 11, and the rod-free cavity is communicated with the atmosphere, so that in the working process of the pinch roll, no matter whether the preset roll gap is too small or the clamping force is higher than (or lower than) the preset pressure value due to the deformation of the intermediate billet, the piston rod of the hydraulic buffer cylinder can be retracted under the cooperation of the energy accumulator 11. Since the hydraulic buffer cylinder 10 has a small stroke and the volume of the discharged oil is small, the pressure in the accumulator 11 is only slightly changed, and a substantially constant clamping force can be ensured. In addition, the dead weight of the pinch roll with the rod cavity pressure superposition can always keep a gapless state because the rodless cavity of the hydraulic buffer cylinder 10 is connected with the atmosphere.
Because the hydraulic buffer cylinder 10 and the energy accumulator 11 are matched, the hydraulic servo cylinder 6 is used with the same rigid tensile body in the working process, the thickness of intermediate blanks with different specifications is only required to be set once, namely, the requirement on the preset roll gap value is not high, the intermediate blanks are buckled to cause larger roll gap change and do not need to be adjusted any more, and various conditions are adapted by the follow-up.
The hydraulic buffer cylinder 10 is added to realize single-side micro adjustment of the pinch roll swing arm 1, the pinch roll swing arm is of an integral structure, two sides of the pinch roll swing arm are respectively provided with a plurality of hinge points, no matter what type of hinge structure is adopted, gaps are necessarily reserved between friction pairs, the gaps are required to swing, the size of the swing amplitude is determined by the size of the gaps, the gaps between sliding bearings in the friction pairs can realize millimeter-level swing of the swing arm by virtue of the amplification effect of the longer pinch roll swing arm, therefore, the single-side micro adjustment of the hydraulic servo cylinder 6 can be realized through the cooperation of the hydraulic buffer cylinder 10 and the energy accumulator 11, and the advantage of micro adjustment of the hydraulic buffer cylinder is realized when the defects existing in the conventional pinch roll swing arm are changed into the implementation of the invention.
The composite hydraulic servo cylinder is under the same oil source, and the pressure of the rod cavity of the hydraulic buffer cylinder and the pressure of the rod cavity of the hydraulic servo cylinder are not equal due to the area difference. The force of the rod cavity of the hydraulic buffer cylinder is always larger than that of the rod cavity of the hydraulic servo cylinder, so that the hydraulic buffer cylinder is always in a completely retracted state in the processes of presetting a roll gap, lifting an upper roll and the like, that is, the hydraulic buffer cylinder 10 has larger influence on the hydraulic servo cylinder 6.
Example 2:
the invention relates to a hot rolling box pinch roll gap adjusting method, which is carried out by utilizing the hot rolling box pinch roll gap adjusting structure described in the embodiment 1, and comprises the following steps:
s1, setting a pinch roll gap value according to the technological requirement of a hot rolling box for clamping an intermediate blank 3, and determining the maximum value and the minimum value of a feedback value of a hydraulic servo cylinder displacement sensor according to the travel range of a hydraulic servo cylinder 6 in a hot rolling box pinch roll gap value adjusting structure, wherein the maximum value of the feedback value of the hydraulic servo cylinder displacement sensor is the value of the pinch roll swing arm 1 in a complete travel state, and the minimum value is the state of the upper pinch roll 4 and the lower pinch roll 5 in a close fit state; in the preparation process of the hot coil box before coiling and uncoiling the intermediate blank 3, the pressure of a hydraulic system is adjusted to the pressure required by the process, and meanwhile, the hydraulic buffer cylinder 10 and the energy accumulator 11 are filled with hydraulic oil through a system hydraulic source according to the process requirement; the controller 19 of the hydraulic system is used for feeding oil to rod cavities of two hydraulic servo cylinders 6 through the servo valves 13, the pinch roll swing arm 1 drives the upper pinch roll 4 to move downwards under the action of the hydraulic servo cylinders 6, so that the upper pinch roll 4 and the lower pinch roll 5 are pressed against and rotate at a set speed, when the feedback value of the hydraulic servo cylinder displacement sensor 18 reaches a predetermined minimum value, the position is used as the starting point of the feedback value of the hydraulic servo cylinder displacement sensor, the controller 19 of the hydraulic system is used for feeding oil to the rodless cavity of the hydraulic servo cylinder 6 through the servo valves 13 at the same time, and when the feedback value of the hydraulic servo cylinder displacement sensor 18 reaches a set roll gap value, the controller 19 is used for closing the servo valves 13 to stop feeding oil to the hydraulic servo cylinders 6, and a hydraulic loop of the hydraulic servo cylinder 6 is closed; it should be noted that the pinch roll gap value is determined according to the ideal value of the pinch roll gap between the upper pinch roll 4 and the lower pinch roll 5 when the intermediate blank 3 is to be pinched in the hot coil box in an ideal state, and the pinch roll gap value may be less than or equal to the ideal value but not greater than the ideal value; meanwhile, the action synchronization degree of the two hydraulic servo cylinders 6 cannot exceed 1-2 mm under any condition, so that hidden danger in production is avoided.
S2, after the roll gap of the pinch roll is adjusted, verifying the roll gap of the straightening roll by using the same pressing force as the pinch roll through the thickness of the calibration plate, and adjusting the roll gap of the straightening roll in a manner of adding and subtracting gaskets if the roll gap of the straightening roll is inconsistent with the roll gap of the pinch roll; the upper straightening roller 4 is arranged on the pinch roller swing arm part 1, the movement of the upper straightening roller is driven by the hydraulic servo cylinder 6, the pressing force of the upper straightening roller is generated by the hydraulic servo cylinder 6, the roller gap of the straightening roller is theoretically equal to the roller gap under the calibration pressure of the pinch roller, and the distance of the upper straightening roller and the lower straightening roller must be adjusted in a manner of adding and subtracting gaskets for ensuring the consistency of the roller gap due to the fixed hinge position;
s3, the head of the intermediate blank 3 bites into the upper pinch roll 4 and the lower pinch roll 5 after uncoiling, and the bite capability of the rolls to the strip is greatly improved due to the preset roll gap, and if the thickness of the strip changes when buckling occurs, the hydraulic buffer cylinder also has the capability of ensuring smooth clamping of the strip, and the set roll gap of the hydraulic servo cylinder at the moment is not changed; because the roll gap of the straightening roll is set according to the calibration value of the pinch roll, the position of the compound hydraulic servo cylinder is between the straightening roll and the pinch roll, and a part of deviation is indirectly balanced, so that the influence of the roll gap of the straightening roll on the intermediate blank is weakened a lot; after the intermediate billet 3 enters the head-cutting flying shears to be sheared through the pinch area and enters the finishing mill F1, the intermediate billet 3 falls off from the upper pinch roll 4 and the lower pinch roll 5, oil is simultaneously fed to rodless cavities of the two hydraulic servo cylinders 6 through the servo valves 13 by the controller 19 of the hydraulic system, the pinch roll swing arm 1 drives the upper pinch roll 4 to move upwards under the action of the hydraulic servo cylinders 6, when the feedback value of the hydraulic servo cylinder displacement sensor reaches a determined maximum value, the upper pinch roll 4 is completely lifted, and the controller 19 of the hydraulic system closes the servo valves 13 to stop feeding oil to the hydraulic servo cylinders 6;
s4, oil is fed into rod cavities of the two hydraulic servo cylinders 6 through the hydraulic system again, the pinch roll swing arm 1 drives the upper pinch roll 4 to move downwards under the action of the hydraulic servo cylinders 6, when the feedback value of the hydraulic servo cylinder displacement sensor reaches a set roll gap value, the upper pinch roll 4 is indicated to be pressed down in place again, the hydraulic system stops feeding oil to the hydraulic servo cylinders 6, a hydraulic loop of the hydraulic servo cylinders 6 is locked, the intermediate billet 3 can be clamped again, and then the steps are circulated.
Claims (3)
1. A roll gap adjusting method for a pinch roll of a hot rolling box is characterized by comprising the following steps of: the hot rolling box pinch roll gap adjusting structure is utilized, the hot rolling box pinch roll gap adjusting structure comprises a hot rolling box frame (7), pinch roll swing arms (1) are movably arranged on the upper sides of the hot rolling box frame (7), stop rolls (2), upper pinch rolls (4) and upper straightening rolls (9) are respectively arranged at the bottoms of the pinch roll swing arms (1), and lower pinch rolls (5) and lower straightening rolls (8) are respectively arranged at positions, corresponding to the upper pinch rolls (4) and the upper straightening rolls (9), on the hot rolling box frame (7); the automatic pinch roll comprises pinch roll swinging arms (1), and is characterized by further comprising compound hydraulic servo cylinders which are respectively arranged at two sides of the pinch roll swinging arms (1), wherein each compound hydraulic servo cylinder comprises a hydraulic servo cylinder (6) and a hydraulic buffer cylinder (10), a hydraulic servo cylinder displacement sensor (18) is arranged at the position of the hydraulic servo cylinder (6), one side of a rodless cavity of the hydraulic servo cylinder (6) is movably connected with a hot roll box rack (7), a piston rod at one side of the rod cavity is fixedly connected with a piston rod at one side of the hydraulic buffer cylinder (10), one side of the rodless cavity of the hydraulic buffer cylinder (10) is hinged with the middle position of the pinch roll swinging arms (1), an energy accumulator (11) is connected with the rod cavity and the rodless cavity of the hydraulic servo cylinder (6), and the rod cavity of the hydraulic buffer cylinder (10) and the energy accumulator (11) are respectively connected with a hydraulic system; the stroke of the hydraulic buffer cylinder (10) is 10mm; the rod cavities of the two hydraulic buffer cylinders (10) are commonly connected with an energy accumulator (11), and the steps are as follows:
s1, setting a pinch roll gap value according to the process requirement of a hot rolling box for clamping an intermediate blank (3), determining the maximum value and the minimum value of feedback values of hydraulic servo cylinder displacement sensors according to the travel range of the hydraulic servo cylinders (6) in a hot rolling box pinch roll gap adjusting structure, feeding oil to rod cavities of the two hydraulic servo cylinders (6) through a hydraulic system, driving an upper pinch roll (4) to move downwards by a pinch roll swing arm (1) under the action of the hydraulic servo cylinders (6), enabling the upper pinch roll (4) and a lower pinch roll (5) to press against and rotate at a set speed, taking the position as a starting point of the feedback values of the hydraulic servo cylinder displacement sensors when the feedback values of the hydraulic servo cylinder displacement sensors reach a preset minimum value, feeding oil to rodless cavities of the hydraulic servo cylinders (6) through the hydraulic system simultaneously, and stopping feeding oil to the hydraulic servo cylinders (6) when the feedback values of the hydraulic servo cylinder displacement sensors reach the set roll gap values, and locking a hydraulic loop of the hydraulic servo cylinders (6);
s2, after the roll gap of the pinch roll is adjusted, verifying the roll gap of the straightening roll by using the same pressing force as the pinch roll through the thickness of the calibration plate, and adjusting the roll gap of the straightening roll in a manner of adding and subtracting gaskets if the roll gap of the straightening roll is inconsistent with the roll gap of the pinch roll;
s3, after the intermediate billet (3) is uncoiled, clamped and falls off from the upper pinch roll (4) and the lower pinch roll (5), oil is fed to rodless cavities of the two hydraulic servo cylinders (6) through a hydraulic system, the pinch roll swing arm (1) drives the upper pinch roll (4) to move upwards under the action of the hydraulic servo cylinders (6), and when the feedback value of the hydraulic servo cylinder displacement sensor reaches a determined maximum value, the upper pinch roll (4) is completely lifted, and the hydraulic system stops feeding oil to the hydraulic servo cylinders (6) at the moment;
s4, oil is fed into rod cavities of two hydraulic servo cylinders (6) again through a hydraulic system, the pinch roll swing arm (1) drives the upper pinch roll (4) to move downwards under the action of the hydraulic servo cylinders (6), when the feedback value of a displacement sensor of each hydraulic servo cylinder reaches a set roll gap value, the upper pinch roll (4) is indicated to be pressed down in place again, the oil feeding to the hydraulic servo cylinders (6) is stopped through the hydraulic system, a hydraulic loop of the hydraulic servo cylinders (6) is locked, the intermediate blank (3) can be clamped again, and then the steps are circulated.
2. The hot box pinch roll gap adjustment method according to claim 1, wherein: the pinch roll gap value is determined according to the ideal value of the pinch roll gap of the upper pinch roll (4) and the lower pinch roll (5) when the intermediate blank (3) is clamped in the hot coil box in an ideal state, and the pinch roll gap value is smaller than or equal to the ideal value.
3. A hot box pinch roll gap adjustment method according to claim 1 or 2, characterized in that: the synchronization degree of the actions of the two hydraulic servo cylinders (6) cannot exceed 1-2 mm.
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| CN202210304398.2A CN114522986B (en) | 2022-03-25 | 2022-03-25 | Roll gap adjusting structure and method for pinch rolls of hot rolling box |
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| CN202210304398.2A CN114522986B (en) | 2022-03-25 | 2022-03-25 | Roll gap adjusting structure and method for pinch rolls of hot rolling box |
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| CN114522986B true CN114522986B (en) | 2023-08-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3559432A (en) * | 1968-05-29 | 1971-02-02 | Textron Inc | Roll gap gage control |
| CN2377023Y (en) * | 1999-02-14 | 2000-05-10 | 中国第二重型机械集团公司 | Heat coiling drum |
| CN102126006A (en) * | 2010-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | Roll gap control method for soft reduction technology for continuous casting |
| CN103769444A (en) * | 2014-02-25 | 2014-05-07 | 中冶赛迪工程技术股份有限公司 | Online treatment device for large bar rolled piece bend |
| CN105080978A (en) * | 2015-09-14 | 2015-11-25 | 太原科技大学 | Design of novel rolling mill hydraulic system |
-
2022
- 2022-03-25 CN CN202210304398.2A patent/CN114522986B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3559432A (en) * | 1968-05-29 | 1971-02-02 | Textron Inc | Roll gap gage control |
| CN2377023Y (en) * | 1999-02-14 | 2000-05-10 | 中国第二重型机械集团公司 | Heat coiling drum |
| CN102126006A (en) * | 2010-01-14 | 2011-07-20 | 宝山钢铁股份有限公司 | Roll gap control method for soft reduction technology for continuous casting |
| CN103769444A (en) * | 2014-02-25 | 2014-05-07 | 中冶赛迪工程技术股份有限公司 | Online treatment device for large bar rolled piece bend |
| CN105080978A (en) * | 2015-09-14 | 2015-11-25 | 太原科技大学 | Design of novel rolling mill hydraulic system |
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| CN114522986A (en) | 2022-05-24 |
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