Full hydraulic constant gap straightener

Abstract

The present application is a kind of full hydraulic constant roll gap straightener, comprising, high stiffness frame, be integrally closed force frame structure arrangement;Roller system device, including upper roller system and lower roller system;Upper movable crossbeam, the straightening force of upper roller system is transmitted to high stiffness frame;Self-adapting roll gap adjustment mechanism, including multiple independent and self-adapting adjustment hydraulic cylinders, the top of each hydraulic cylinder is connected to high stiffness frame, the bottom of each hydraulic cylinder is abutted to the top of upper movable crossbeam;Multi-point bending roll compensation mechanism, fixedly connected to upper movable crossbeam and upper roller system, including multiple rows of bending roll compensation units, for dynamic compensation when straightening the elastic deformation of upper roller system and dynamic adjustment the crown of upper roller system;Main transmission system;Roll changing system.The present application realizes the presetting and dynamic compensation of roll gap through self-adapting roll gap adjustment mechanism and multi-point bending roll compensation mechanism, can realize the dynamic maintenance of roll gap constant, the straightening process is stable, the degree of automation is high, the roll changing rhythm is fast, and the safety protection is reliable.

Description

Technical Field

[0001] This invention relates to the field of heavy plate production technology, and in particular to a fully hydraulic constant roll gap straightening machine. Background Technology

[0002] A straightening machine is one of the main finishing equipment in a heavy plate production line. It is primarily used to eliminate residual internal stress and shape defects in steel plates to obtain straight steel plates. Since steel plates may bend and deform during rolling, cooling, transportation, and shearing, heavy plate production lines typically have multiple straightening machines installed at different locations based on their process characteristics. According to their location and straightening temperature, they can be further classified into pre-straightening machines, hot straightening machines, warm straightening machines, and cold straightening machines. In recent years, with the continuous advancement of rolling and online heat treatment technologies, steel enterprises are producing steel plates with increasingly higher strength properties. The internal stress generated during rolling and heat treatment is also increasing, and the bending deformation of steel plates is becoming more complex. In addition to longitudinal bending, transverse warping, edge waviness, and center waviness are frequently observed. Conventional straightening machines are no longer sufficient to eliminate these waviness defects and cannot guarantee the straightening quality of the steel plates.

[0003] The main technical feature of conventional straightening machines is that the bending roll mechanism adopts a single hydraulic cylinder split beam structure. The bending roll effect is achieved by changing the angle of the split beam through the bending roll hydraulic cylinder driving a multi-link eccentric mechanism. However, the bending roll curve formed by this bending roll mechanism is a broken line, which deviates significantly from the actual deformation of the roll system under load. It is difficult to compensate for the deformation of the roll system and maintain the original set roll gap constant. The bending roll curves required by the theoretical calculation based on the characteristics of steel plate wavy shape are all arcs, but the bending roll curve of this machine is a broken line. The bending roll accuracy is very low, and it is impossible to flexibly set the corresponding bending roll gap for various wavy shapes of steel plates. In addition, the broken line roll gap after bending rolls can easily cause uneven load on the support roll bearings and overload, and the straightening roll is subjected to fatigue load from repeated bending of the broken line, which will greatly reduce the service life of the roll system. The split beam bending roll is a non-integral frame, which has a series of problems such as low rigidity and long-term wear of rotating force-bearing parts, which reduces the accuracy of the equipment. Therefore, this type of bending roller mechanism cannot meet the straightening requirements of high-strength steel plates. The straightening effect of steel plates with a yield strength greater than 400MPa on this model is very unsatisfactory.

[0004] In addition, the frame is the main load-bearing component of the straightening machine, bearing all the straightening force, resisting equipment deformation, and maintaining a constant roll gap. Conventional straightening machine frames generally adopt a prestressed composite structure. Although this structure has advantages such as light equipment weight, short manufacturing period, and convenient disassembly and transportation, it has low rigidity and the overall accuracy cannot be guaranteed after pre-tightening. In particular, all the straightening force and equipment pre-tightening force rely on the threads of four high-strength tie rods. Under the long-term action of alternating loads, the tie rod threads are prone to plastic deformation, resulting in the problem that the tie rods are severely deformed and the threads fail within ten years of the equipment being put into operation, making it unusable.

[0005] To improve sheet shape, product quality, and production efficiency, the use of new materials, processes, and technologies to significantly enhance the performance of straightening machines is urgently needed. One existing technology is a 9 / 5-roll straightening machine, primarily used for cold straightening of thin steel plates, with the aim of also straightening some thicker steel plates. The most prominent feature of the 9 / 5-roll straightening machine is its ability to flexibly switch the number of straightening rolls online. Depending on the thickness of the steel plate to be straightened, either 9 rolls or 5 rolls can be used on the same straightening machine to complete the straightening work. When all 9 straightening rolls are in use, the roll spacing is relatively small, suitable for straightening thin steel plates. If only 5 rolls are used, the roll spacing is doubled, suitable for straightening thicker steel plates. However, thin steel plates do not actually require high straightening force, while the straightening force requirement for thick steel plates increases quadratically with the plate thickness. Since thick steel plates are straightened using 5-roll straighteners, the available straightening force is only half that of 9-roll straighteners, which contradicts the design and practice. Moreover, 5 rolls are too few for a straightener, requiring multiple passes for straightening, which seriously affects the production rhythm. Therefore, the 5-roll straightener of the 9 / 5-roll straightener is difficult to meet the straightening requirements of wide and thick plates in actual use. Furthermore, the frequent switching between 9 and 5 rolls leads to uneven wear on each straightening roll, affecting straightening accuracy, and many functions on the production floor cannot be used normally. Existing technologies have strengthened the structure of traditional straightening machines, such as increasing the cross-section of the prestressed frame and high-strength tie rods, which increases the overall rigidity of the straightening machine to some extent. However, this does not fundamentally solve the problem of tie rod thread deformation and failure after long-term use of the prestressed frame. In addition, the HAGC of the roll gap adjustment mechanism is a traditional structure with a booster cylinder. Although this structure has the advantages of compact structure, easy layout, and low pressure and oil volume requirements of the hydraulic system, it has a series of disadvantages such as complex structure of the HAGC cylinder, frequent switching between the working modes of the main cylinder and the booster cylinder, cumbersome control of the hydraulic and electrical systems, slow response speed, and high failure rate.

[0006] Regarding the compensation of the bending rolls in a straightening machine, the existing patent "A Method for Straightening Based on Dynamic Side Rolls and Bending Rolls" proposes a calculation method for the bending roll model (application number 202010405767.8). However, this patent does not propose a measure for implementing the bending roll compensation device, nor does it propose how to achieve constant roll gap straightening.

[0007] In view of the aforementioned problems of existing straightening machines, the inventors, in light of the practical applications of straightening machines, aim to overcome the shortcomings of existing technologies in terms of structure and provide a fully hydraulic constant roll gap straightening machine that can achieve dynamic and constant roll gap, smooth straightening process, high degree of automation, fast roll changing rhythm, reliable safety protection, and can be used for wide and thick plates. Summary of the Invention

[0008] The purpose of this invention is to provide a fully hydraulic constant roll gap straightening machine, which achieves the pre-setting and dynamic compensation of roll gap through an adaptive roll gap adjustment mechanism and a multi-point bending roll compensation mechanism. This enables the roll gap to be dynamically maintained at a constant value, resulting in a smooth straightening process, a high degree of automation, fast roll changing rhythm, and reliable safety protection.

[0009] The objective of this invention is achieved by providing a fully hydraulic constant roll gap straightening machine, comprising:

[0010] The high-rigidity frame is designed as an integral, enclosed load-bearing frame structure.

[0011] The roller system is installed on the high-rigidity frame and includes an upper roller system and a lower roller system. The straightening force is transmitted to the high-rigidity frame through the upper roller system and the lower roller system.

[0012] An upper movable crossbeam is located above the upper roller system and is vertically movable and connected to the high-rigidity frame. The upper movable crossbeam can transmit the straightening force of the upper roller system to the high-rigidity frame.

[0013] An adaptive roll gap adjustment mechanism is used to provide straightening force and adaptively adjust the roll gap between the upper and lower roll systems. It includes multiple independent and adaptively adjustable hydraulic cylinders, which are symmetrically arranged on the transmission and operation sides of a high-rigidity frame. The top end of each hydraulic cylinder is connected to the high-rigidity frame, and the bottom end of each hydraulic cylinder abuts against the top end of the upper movable crossbeam.

[0014] The multi-point bending roller compensation mechanism has its top and bottom ends fixedly connected to the upper movable crossbeam and the upper roller system, respectively. It includes multiple rows of parallel bending roller compensation units, each of which is independently set up. It is used to dynamically compensate for the elastic deformation of the upper roller system during straightening and to dynamically adjust the convexity of the upper roller system.

[0015] The main drive system is located on the drive side of the fully hydraulic constant roll gap straightener and is connected to the roller system to drive the steel plate forward and straighten it under bending conditions.

[0016] A roller changing system is used to replace the roller system.

[0017] In a preferred embodiment of the present invention, the plurality of hydraulic cylinders are individually or synchronously controlled by a hydraulic servo system, and the plurality of hydraulic cylinders drive the upper movable crossbeam, the multi-point bending roller compensation mechanism and the upper roller system to move up and down to adjust the position of the upper roller system relative to the lower roller system.

[0018] In a preferred embodiment of the present invention, the hydraulic cylinder includes a cylinder body, a piston rod is slidably and sealed through the cylinder body from the bottom end, a pressure-bearing rod is inserted inward from the bottom end of the piston rod, an adaptive pad is provided on the top of the inner wall of the cylinder body, a spherical groove is provided inward from the bottom surface of the adaptive pad, a spherical structure is provided on the top end of the pressure-bearing rod that can abut against the spherical groove, and the bottom end of the pressure-bearing rod abuts against the upper movable crossbeam.

[0019] In a preferred embodiment of the present invention, a displacement sensor and a pressure sensor are disposed inside the cylinder.

[0020] In a preferred embodiment of the present invention, the high-rigidity frame further includes a frame base, and a transmission-side archway and an operating-side archway are provided on both sides of the frame base; an archway connecting beam connects the transmission-side archway and the operating-side archway; a balancing lifting mechanism is provided on the side of the transmission-side archway near the operating-side archway and on the side of the operating-side archway near the transmission-side archway; the top end of the upper movable beam is suspended from the bottom end of the balancing lifting mechanism; and the hydraulic cylinders of the adaptive roll gap adjustment mechanism and the balancing lifting mechanism jointly adjust the position of the upper movable beam in the vertical direction.

[0021] In a preferred embodiment of the present invention, windows are symmetrically arranged on the transmission-side archway and the operation-side archway. The top of the window of the transmission-side archway is a first upper crossbeam, the bottom of the window of the transmission-side archway is a first lower crossbeam, and the two sides of the window of the transmission-side archway are first columns. The top of the window of the operation-side archway is a second upper crossbeam, the top of the window of the operation-side archway is a second lower crossbeam, and the two sides of the window of the operation-side archway are second columns. The adaptive roll gap adjustment mechanism is disposed inside the windows of the transmission-side archway and the operation-side archway. The top of each hydraulic cylinder abuts against the first upper crossbeam or the second upper crossbeam. The upper movable crossbeam, the multi-point bending roll compensation mechanism, and the upper roll system move up and down within the window. The two sides of the frame base are supported on the first lower crossbeam and the second lower crossbeam, and the lower roll system is disposed on the frame base.

[0022] In a preferred embodiment of the present invention, a first row of wear-resistant liners, a second row of wear-resistant liners, and a third row of wear-resistant liners are arranged at intervals from top to bottom on the inner sidewalls of the windows of the transmission side archway and the operation side archway; the first row of wear-resistant liners is arranged in a stepped structure with a smooth transition at an angle to the sidewall facing the window, and the thickness of the first row of wear-resistant liners increases from bottom to top; the second row of wear-resistant liners and the third row of wear-resistant liners are arranged in a planar manner on the sidewall facing the window; the first row of wear-resistant liners and the second row of wear-resistant liners are used for positioning and guiding the upper movable crossbeam, the multi-point bending roller compensation mechanism, and the upper roller system; the third row of wear-resistant liners can be used for positioning the lower roller system.

[0023] In a preferred embodiment of the present invention, the upper movable crossbeam includes an upper movable frame, a self-weight balancing connecting frame is provided at the top of the upper movable frame, the self-weight balancing connecting frame is connected to the balancing lifting mechanism, pressing support surfaces are provided on both sides of the top of the upper movable frame, and the bottom end of the hydraulic cylinder abuts against the pressing support surface; a flexible locking device is provided at the bottom of the upper movable frame, and the multi-point bending roller compensation mechanism is connected to the flexible locking device; guide wear-resistant sliding plates are provided on both sides of the bottom of the upper movable frame; a connecting rod locking mechanism is provided on both sides of the upper movable frame, and the upper roller system is fixedly connected to the multi-point bending roller compensation mechanism through the connecting rod locking mechanism.

[0024] In a preferred embodiment of the present invention, the multi-point bending roller compensation mechanism includes a bending roller compensation frame, and each of the bending roller compensation units is arranged in multiple rows along the axial direction of the roller system within the bending roller compensation frame; the bending roller compensation frame is connected to the flexible locking device, and the top of each of the bending roller compensation units abuts against the bottom surface of the upper movable frame.

[0025] In a preferred embodiment of the present invention, each of the bending roll compensation units is provided with a position detection element, which provides real-time feedback on the actual compensation amount of the bending roll compensation unit; each of the bending roll compensation units adopts a separate control loop to adjust the compensation value of the bending roll compensation unit individually or in groups.

[0026] In a preferred embodiment of the present invention, the upper roller system includes an upper roller box with an opening facing downwards, the top surface of the upper roller box abutting against the bottom surface of the multi-point bending roller compensation mechanism, and a plurality of upper support rollers are disposed inside the upper roller box, the plurality of upper support rollers supporting and connecting the upper straightening roller; the lower roller system includes a lower roller box with an opening facing upwards, the bottom surface of the lower roller box abutting against the top surface of the frame base, and a plurality of lower support rollers are disposed inside the lower roller box, the plurality of lower support rollers supporting and connecting the lower straightening roller; the adaptive roller gap adjustment mechanism adjusts the roller gap between the upper straightening roller and the lower straightening roller in real time to keep it constant.

[0027] In a preferred embodiment of the present invention, the roller system further includes an inlet side roller and an outlet side roller.

[0028] In a preferred embodiment of the present invention, the main drive system includes a frequency converter, a safety coupling, a gear reducer and a plurality of drive shafts connected in series, and the first end of each drive shaft is connected to the upper straightening roller or the lower straightening roller.

[0029] In a preferred embodiment of the present invention, the roller changing system 7 includes a drive mechanism, a shaft positioning mechanism, and a lower roller lifting device.

[0030] As described above, the fully hydraulic constant roll gap straightening machine of the present invention has the following beneficial effects:

[0031] The fully hydraulic constant roll gap straightener of this invention achieves pre-setting and dynamic compensation of the roll gap through an adaptive roll gap adjustment mechanism and a multi-point bending roll compensation mechanism, ensuring a constant roll gap. The hydraulic cylinders that make up the adaptive roll gap adjustment mechanism can be controlled individually or synchronously. The upper roll system is pre-set to have a certain amount of tilting horizontally or along the rolling direction and the axis of the straightening roll. Combined with the individual adjustment of the inlet / outlet side rolls, the roll gap types that can be set are very rich. In actual production, the roll gap type and reduction amount can be set in a targeted manner according to the different wavy shapes of the steel plate. Furthermore, the elastic deformation of the straightener frame can be calculated online based on the straightening force predicted by the control model. The elastic deformation is compensated by the roll gap adjustment mechanism to maintain the constant roll gap set during the straightening process.

[0032] The bending roll compensation device of the present invention can realize multi-point online bending roll compensation. The device is installed between the upper pressure frame and the upper roll system. Multiple short-stroke servo hydraulic cylinders are arranged in several rows in the bending roll frame. All servo hydraulic cylinders are equipped with displacement sensors and can be controlled individually or in groups. By setting different extension and retraction amounts of each servo hydraulic cylinder, different bending amounts are applied along the width direction of the plate. The bending roll compensation mechanism can dynamically compensate for equipment deformation according to the model calculation value, maintain the constant roll gap, or dynamically adjust the positive and negative bending rolls of the upper roll system for different plate types to improve the straightening quality.

[0033] The roll gap adjustment mechanism of this invention has a micro-adaptive adjustment function. According to the requirements of the straightening process, the upper roll system of a thick plate is set to have a certain amount of forward and backward tilting and left and right tilting during straightening. Conventional designs would cause the HAGC hydraulic cylinder of the roll gap adjustment mechanism to tilt under stress, and the pressure rod inside the hydraulic cylinder would generate a bending moment on the piston rod of the HAGC hydraulic cylinder, aggravating the wear of the HAGC hydraulic cylinder seals and reducing the service life of the HAGC hydraulic cylinder. This invention designs the top of the pressure rod as a spherical adaptive structure. This structure ensures that the pressure rod only bears axial pressure during the tilting straightening of the upper roll system, avoiding the pressure rod generating an additional bending moment on the piston rod.

[0034] The high-rigidity frame of this invention adopts an integral cast steel closed structure. The straightening force generated during the straightening of the steel plate is transmitted to the two arches of the high-rigidity frame through two paths, the upper roller system and the lower roller system, respectively. The straightening force forms a stress closed loop along the arch window and reaches equilibrium. When not straightening, the entire frame is in a "zero stress" state. In contrast, conventional prestressed frames have very large pre-tension internal stress when not straightening, and are in a state of superposition of straightening force and pre-tension force stress during straightening. The high-rigidity frame of this invention is always in a low stress or zero stress state, which is a great improvement compared with the stress state of traditional frames, and avoids permanent deformation of the equipment after long-term use. Attached Figure Description

[0035] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0036] in:

[0037] Figure 1 : This is an isometric drawing of the fully hydraulic constant roller seam straightening machine of the present invention.

[0038] Figure 2 : This is a front view of the fully hydraulic constant roll gap straightening machine of the present invention.

[0039] Figure 3 : This is a side view of the fully hydraulic constant roll gap straightening machine of the present invention.

[0040] Figure 4 : This is an isometric drawing of the high-rigidity frame of the present invention.

[0041] Figure 5 : This is a cross-sectional view of the hydraulic cylinder of the adaptive roll gap adjustment mechanism of the present invention in two states.

[0042] Figure 6 : This is a schematic diagram of the axial structure of the upper movable crossbeam of the present invention.

[0043] Figure 7 : This is an isometric view of the multi-point bending roller compensation mechanism of the present invention.

[0044] Figure 8 : This is a cross-sectional view of the multi-point bending roller compensation mechanism of the present invention.

[0045] Figure 9 : This is an isometric view of the roller system device of the present invention.

[0046] Figure 10 : This is a cross-sectional view of the roller system device of the present invention.

[0047] Figure 11 This is an isometric schematic diagram of the working process of the fully hydraulic constant roll gap straightening machine of the present invention.

[0048] Figure 12 This is a schematic diagram of the operating side structure of the fully hydraulic constant roll gap straightener of the present invention during its working process.

[0049] Figure 13 This is a schematic diagram of the working flat roller gap straightening machine of the present invention.

[0050] Figure 14 This is a schematic diagram of the working positive bending roller gap straightening machine of the present invention.

[0051] Figure 15 This is a schematic diagram of the negative bending roller gap straightening process of the fully hydraulic constant roller gap straightening machine of the present invention.

[0052] In the picture:

[0053] 1. High-rigidity frame;

[0054] 11. Transmission side archway; 111. First upper crossbeam; 112. First lower crossbeam; 113. First column;

[0055] 12. Operating side archway; 121. Second upper crossbeam; 122. Second lower crossbeam; 123. Second column;

[0056] 13. Frame base; 14. Archway connecting beam; 15. Balance lifting mechanism; 16. First row of wear-resistant liners; 17. Second row of wear-resistant liners; 18. Third row of wear-resistant liners;

[0057] 2. Adaptive roll gap adjustment mechanism;

[0058] 21. Hydraulic cylinder; 22. Cylinder top surface; 23. Pressure rod; 24. Spherical structure; 25. Adaptive pad; 26. Piston rod; 27. Displacement sensor; 28. Pressure sensor;

[0059] 3. Install the upper movable crossbeam;

[0060] 31. Upper movable frame; 32. Flexible locking device; 33. Linkage locking mechanism; 34. Guide wear-resistant sliding plate; 35. Self-weight balancing connecting frame; 36. Press-down support surface;

[0061] 4. Multi-point bending roller compensation mechanism;

[0062] 41. Bending roll compensation frame; 42. Bending roll compensation unit; 43. Position detection element;

[0063] 5. Roller system;

[0064] 51. Upper roller system; 511. Upper roller box; 52. Lower roller system; 521. Lower roller box; 531. Upper straightening roller; 532. Lower straightening roller; 541. Upper support roller; 542. Lower support roller; 55. Inlet side roller; 56. Outlet side roller;

[0065] 6. Main drive system; 61. Variable frequency motor; 62. Safety coupling; 63. Gear reducer; 64. Transmission shaft; 65. Spline pair; 66. Gear reducer output shaft;

[0066] 7. Roll changing system; 71. Drive mechanism; 72. Shaft positioning mechanism; 73. Lower roller lifting device;

[0067] 8. Steel plate. Detailed Implementation

[0068] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0069] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0071] like Figures 1 to 12 As shown, the present invention provides a fully hydraulic constant roll gap straightening machine, including a high rigidity frame 1, an adaptive roll gap adjustment mechanism 2, an upper movable crossbeam 3, a multi-point bending roll compensation mechanism 4, a roll system device 5, a main drive system 6, and a roll changing system 7.

[0072] The high-rigidity frame 1 is an integrally enclosed load-bearing frame structure. The high-rigidity frame 1 is the main load-bearing component of the fully hydraulic constant roll gap straightener. It bears all the straightening force, resists equipment deformation, and ensures high-precision straightening of steel plates. At the same time, it also provides positioning and installation connection for some auxiliary mechanisms of the fully hydraulic constant roll gap straightener.

[0073] The roller system 5 is installed on the high-rigidity frame 1 and includes an upper roller system 51 and a lower roller system 52. The straightening force is transmitted to the high-rigidity frame 1 through the upper roller system 51 and the lower roller system 52. By reasonably setting the roller gap value between the upper roller system 51 and the lower roller system 52, including the roller opening degree, longitudinal tilting amount, transverse tilting amount, bending amount, and the position of the inlet side roller / outlet side roller, the residual curvature and residual stress of the steel plate after continuous straightening by the straightening rollers are controlled within the allowable range.

[0074] The upper movable crossbeam 3 is located above the upper roller system 51 and is vertically movable and connected to the high-rigidity frame 1. The upper movable crossbeam 3 can transfer the straightening force of the upper roller system 51 to the high-rigidity frame 1. The straightening force generated by the upper roller system 51 when straightening the steel plate is transferred to the adaptive roll gap adjustment mechanism 2 and the high-rigidity frame 1. The upper movable crossbeam 3 is an integral welded frame structure with characteristics such as high rigidity and strong load-bearing capacity.

[0075] The adaptive roll gap adjustment mechanism 2 is used to provide straightening force and adaptively adjust the roll gap between the upper roll system 51 and the lower roll system 52. It includes multiple independent and adaptively adjustable hydraulic cylinders 21 (HAGC hydraulic cylinders). The multiple hydraulic cylinders 21 are symmetrically arranged on the transmission side and the operating side of the high-rigidity frame 1. The top end of each hydraulic cylinder 21 is connected to the high-rigidity frame 1, and the bottom end of each hydraulic cylinder 21 abuts against the top end of the upper movable crossbeam 3. The adaptive roll gap adjustment mechanism 2 provides the full straightening force and precisely adjusts the roll gap size between the upper roll system 51 and the lower roll system 52, so that the steel plate undergoes repeated bending deformation between the upper roll system 51 and the lower roll system 52, reducing the residual curvature and residual stress of the steel plate. The adaptive roll gap adjustment mechanism 2 can achieve dual protection of position and pressure.

[0076] The multi-point bending roller compensation mechanism 4 is fixedly connected to the upper movable crossbeam 3 and the upper roller system 51 at its top and bottom ends, respectively. It includes multiple rows of parallel bending roller compensation units 42, each bending roller compensation unit 42 is set independently. By setting different compensation amounts for each bending roller compensation unit 42, the elastic deformation of the upper roller system 51 during straightening is dynamically compensated, and the convexity of the upper roller system 51 is dynamically adjusted according to the model calculation value.

[0077] The main drive system 6 is located on the drive side of the fully hydraulic constant roll gap straightener and is the main power source of the fully hydraulic constant roll gap straightener. The main drive system 6 is connected to the roll system device 5 to drive the steel plate forward and straighten it under the bending state.

[0078] The roller changing system 7 is used to replace the roller system device 5. Its main function is to ensure the rapid replacement of the roller system device 5.

[0079] The fully hydraulic constant roll gap straightener of this invention achieves pre-setting and dynamic compensation of the roll gap through an adaptive roll gap adjustment mechanism and a multi-point bending roll compensation mechanism, ensuring a constant roll gap. The hydraulic cylinders that make up the adaptive roll gap adjustment mechanism can be controlled individually or synchronously. The upper roll system is pre-set to have a certain amount of tilting horizontally or along the rolling direction and the axis of the straightening roll. Combined with the individual adjustment of the inlet / outlet side rolls, the roll gap types that can be set are very rich. In actual production, the roll gap type and reduction amount can be set in a targeted manner according to the different wavy shapes of the steel plate. Furthermore, the elastic deformation of the straightener frame can be calculated online based on the straightening force predicted by the control model. This elastic deformation is compensated by the adaptive roll gap adjustment mechanism to maintain the constant roll gap set during the straightening process.

[0080] The bending roll compensation device of the present invention can realize multi-point online bending roll compensation. The device is installed between the upper pressure frame and the upper roll system. Multiple short-stroke servo hydraulic cylinders are arranged in several rows in the bending roll frame. All servo hydraulic cylinders are equipped with displacement sensors and can be controlled individually or in groups. By setting different extension and retraction amounts of each servo hydraulic cylinder, different bending amounts are applied along the width direction of the plate. The bending roll compensation mechanism can dynamically compensate for equipment deformation according to the model calculation value, maintain the constant roll gap, or dynamically adjust the positive and negative bending rolls of the upper roll system for different plate shapes to improve the straightening quality.

[0081] Furthermore, such as Figure 2 As shown, multiple hydraulic cylinders 21 are individually or synchronously controlled by a hydraulic servo system. Multiple hydraulic cylinders 21 drive the upper movable crossbeam 3, the multi-point bending roll compensation mechanism 4 and the upper roll system 51 to move up and down, and precisely adjust the position of the upper roll system 51 relative to the lower roll system 52. The upper roll system can be preset to be horizontal or tilted to a certain extent along the rolling direction and the axis of the straightening roll.

[0082] Furthermore, such as Figure 3 , Figure 6 , Figure 11 , Figure 12 As shown, the hydraulic cylinder 21 includes a cylinder body, a piston rod 26 that slides through the cylinder body from the bottom end, a pressure rod 23 that passes inward from the bottom end of the piston rod 26, and the bottom end of the pressure rod 23 abuts against the upper movable crossbeam 3. An adaptive pad 25 is provided on the top of the inner wall of the cylinder body, and a spherical groove is provided on the bottom surface of the adaptive pad 25. A spherical structure 24 that can abut against the spherical groove is provided on the top end of the pressure rod 23. This spherical fit structure ensures that the pressure rod 23 only bears axial pressure when the upper roller system 51 tilts and straightens, avoiding the pressure rod 23 from generating a bending moment on the piston rod 26 and damaging the hydraulic cylinder.

[0083] Furthermore, such as Figure 6As shown, a displacement sensor 27 (high-precision displacement sensor) and a pressure sensor 28 are installed inside the cylinder, which can form a closed-loop control of the roll gap size and straightening force during operation, and can also compensate for the bounce deformation of the high-rigidity frame 1 and other structures during operation; the high-precision displacement sensor 27 ensures the adjustment accuracy of the roll gap size, and can also realize the limit protection of the position of the upper roller system 51 through the displacement sensor 27.

[0084] The roll gap adjustment mechanism of this invention has a micro-adaptive adjustment function. According to the requirements of the straightening process, the upper roll system of a thick plate is set to have a certain amount of forward and backward tilting and left and right tilting during straightening. Conventional designs would cause the HAGC hydraulic cylinder of the roll gap adjustment mechanism to be tilted and subjected to force. The pressure rod inside the hydraulic cylinder would generate a bending moment on the piston rod of the HAGC hydraulic cylinder, increasing the wear of the HAGC hydraulic cylinder seals and reducing the service life of the HAGC hydraulic cylinder. This invention designs the top of the pressure rod as a spherical adaptive structure. This structure ensures that the pressure rod only bears axial pressure during the tilting straightening of the upper roll system, avoiding the pressure rod generating an additional bending moment on the piston rod.

[0085] Furthermore, such as Figure 2 , Figure 3 , Figure 4 As shown, the high-rigidity frame 1 also includes a frame base 13, with a transmission-side archway 11 and an operation-side archway 12 on both sides of the frame base 13 (the common features of the two archways will be described using the archway designation in this invention); an archway connecting beam 14 connects the transmission-side archway 11 and the operation-side archway 12. The frame base 13, the transmission-side archway 11, the operation-side archway 12, and the archway connecting beam 14 are assembled and connected to form an integral closed force-bearing frame. The adaptive roll gap adjustment mechanism 2, the upper movable beam 3, the multi-point bending roll compensation mechanism 4, and the roll system device 5 are installed inside the closed force-bearing frame.

[0086] A balancing lifting mechanism 15 is installed on the inner side of the transmission side gate 11 near the operation side gate 12 and on the inner side of the operation side gate 12 near the transmission side gate 11. The function of the balancing lifting mechanism 15 is to balance the weight of the upper movable crossbeam 3, the multi-point bending roller compensation mechanism 4, and the upper roller system 51. The number of these mechanisms is generally even and they are symmetrically arranged on the inner sides of the transmission side gate 11 and the operation side gate 12. The top of the upper movable crossbeam 3 is suspended from the bottom of the balancing lifting mechanism 15. The hydraulic cylinders 21 of the adaptive roller gap adjustment mechanism 2 and the balancing lifting mechanism 15 work together to adjust the position of the upper movable crossbeam 3 in the vertical direction.

[0087] Furthermore, such as Figure 4As shown, windows are symmetrically arranged on the transmission side archway 11 and the operation side archway 12. The top of the window of the transmission side archway 11 is the first upper crossbeam 111, the bottom of the window of the transmission side archway 11 is the first lower crossbeam 112, and the two sides of the window of the transmission side archway 11 are the first columns 113. The top of the window of the operation side archway 12 is the second upper crossbeam 121, the top of the window of the operation side archway 12 is the second lower crossbeam 122, and the two sides of the window of the operation side archway 12 are the second columns 123. The adaptive roll gap adjustment mechanism 2 is set inside the windows of the transmission side archway 11 and the operation side archway 12. The top of each hydraulic cylinder 21 abuts against the first upper crossbeam 111 or the second upper crossbeam 121. The upper movable crossbeam 3, the multi-point bending roll compensation mechanism 4, and the upper roll system 51 move up and down inside the window. The two sides of the frame base 13 are supported on the first lower crossbeam 112 and the second lower crossbeam 122, and the lower roll system 52 is set on the frame base 13.

[0088] The transmission-side archway 11 and the operating-side archway 12 adopt a high-rigidity integral cast steel closed structure. The straightening force F generated during steel plate straightening is transmitted through two paths, the upper roller system 51 and the lower roller system 52, to the first upper crossbeam 111 and the first lower crossbeam 112 of the transmission-side archway 11, and the second upper crossbeam 121 and the second lower crossbeam 122 of the operating-side archway 12. The straightening force F forms a closed loop on the first column 113 of the transmission-side archway 11 and the second column 123 of the operating-side archway 12, transforming into internal force and reaching equilibrium. Multiple curved transitions are used at the corners of the transmission-side archway 11 and the operating-side archway 12 to eliminate stress concentration.

[0089] Furthermore, such as Figure 3 As shown, multiple rows of wear-resistant liners are provided inside the windows of the transmission side archway 11 and the operation side archway 12. These liners are used for positioning the upper movable crossbeam 3, the multi-point bending roller compensation mechanism 4, the roller system device 5, and for precisely guiding each moving part of the upper roller system 51 when it moves in the vertical direction.

[0090] On the inner side walls of the windows of the transmission-side archway 11 and the operating-side archway 12, a first row of wear-resistant liners 16, a second row of wear-resistant liners 17, and a third row of wear-resistant liners 18 are arranged from top to bottom. The first row of wear-resistant liners 16 has a stepped structure with a smooth transition at an angle towards the window, and the thickness of the first row of wear-resistant liners 16 increases from bottom to top. The second row of wear-resistant liners 17 and the third row of wear-resistant liners 18 have a flat surface towards the window. The first row of wear-resistant liners 16 and the second row of wear-resistant liners 17 are used for the upper movable crossbeam 3 and multi-point... The bending roller compensation mechanism 4 and the upper roller system 51 are positioned and guided; the first row of wear-resistant liners 16 are used to position and guide the upper movable crossbeam 3, the multi-point bending roller compensation mechanism 4, and the upper roller system 51 during equipment maintenance and adjustment of the large opening of the roller gap; the second row of wear-resistant liners 17 positions and guides the upper roller system 51 in the straightening state to prevent the upper roller system 51 from swaying back and forth under the action of the straightening force and to keep the position of each straightening roller relatively fixed; the third row of wear-resistant liners 18 can be used for positioning the lower roller system 52, adjusting the equipment gap, and eliminating equipment vibration.

[0091] The high-rigidity frame of this invention adopts an integral cast steel closed structure. The straightening force generated during the straightening of the steel plate is transmitted to the two arches of the high-rigidity frame through two paths, the upper roller system and the lower roller system, respectively. The straightening force forms a stress closed loop along the arch window and reaches equilibrium. When not straightening, the entire frame is in a "zero stress" state. In contrast, conventional prestressed frames have very large pre-tension internal stress when not straightening, and are in a state of superposition of straightening force and pre-tension force stress during straightening. The high-rigidity frame of this invention is always in a low stress or zero stress state, which is a great improvement compared with the stress state of traditional frames, and avoids permanent deformation of the equipment after long-term use.

[0092] Furthermore, such as Figure 6 As shown, the upper movable crossbeam 3 includes an upper movable frame 31. A self-weight balancing connecting frame 35 is provided at the top of the upper movable frame 31. The self-weight balancing connecting frame 35 is connected to the balancing lifting mechanism 15 and is lifted vertically upward by the balancing lifting mechanism 15 to balance its own weight. Pressing support surfaces 36 are provided on both sides of the top of the upper movable frame 31, and the bottom end of the hydraulic cylinder 21 abuts against the pressing support surface 36. A flexible locking device 32 is provided at the bottom of the upper movable frame 31, and the multi-point bending roller compensation mechanism 4 is connected to the flexible locking device 32. Guide wear-resistant sliding plates 34 are provided on both sides of the bottom of the upper movable frame 31. A connecting rod locking mechanism 33 is provided on both sides of the upper movable frame 31, and the upper roller system 51 is fixedly connected to the multi-point bending roller compensation mechanism 4 through the connecting rod locking mechanism 33.

[0093] like Figure 3 , Figure 11As shown, in a specific embodiment of the present invention, the adaptive roll gap adjustment mechanism 2 includes four independent hydraulic cylinders 21 (HAGC hydraulic cylinders), which are symmetrically arranged below the first upper crossbeam 111 and the second upper crossbeam 121 of the windows of the transmission side archway 11 and the operation side archway 12. The top surface 22 of the cylinder barrel of the hydraulic cylinder 21 abuts against the support surface of the first upper crossbeam 111 and the second upper crossbeam 121, and the end of the pressure rod 23 of the hydraulic cylinder 21 abuts against the pressing support surface 36 of the upper movable crossbeam 3.

[0094] The main function of the upper movable crossbeam 3 is to fix and support the multi-point bending roller compensation mechanism 4 and the upper roller system 51, and to transmit the straightening force generated by the upper roller system 51 when straightening the steel plate to the adaptive roll gap adjustment mechanism 2 and the transmission side archway 11 and the operation side archway 12. At the same time, the straightening force generated by the lower roller system 52 when straightening the steel plate is also transmitted to the transmission side archway 11 and the operation side archway 12. The two form internal forces and balance each other.

[0095] Furthermore, such as Figure 7 , Figure 8 As shown, the multi-point bending roll compensation mechanism 4 includes a bending roll compensation frame 41, and each bending roll compensation unit 42 is arranged in multiple rows along the axial direction of the roller system (along the width direction of the steel plate) within the bending roll compensation frame 41; the bending roll compensation frame 41 is connected to the flexible locking device 32, and the top of each bending roll compensation unit 42 abuts against the bottom surface of the upper movable frame 31.

[0096] Each bending roll compensation unit 42 can apply different amounts of compensation along the width direction of the steel plate. This can not only counteract the bending deformation of the upper roll system 51 under load and maintain a constant roll gap, but also allow the longitudinal fibers of the steel plate to withstand different degrees of tension and compression during straightening, thereby eliminating the plate shape difference in the width direction of the steel plate and ultimately achieving uniform longitudinal fiber extension. The present invention does not limit the number of bending roll compensation units.

[0097] The multi-point bending roller compensation mechanism 4 is located between the upper movable crossbeam 3 and the upper roller system 51. It is connected to the upper movable crossbeam 3 as a whole through a flexible locking device 32. The top of the bending roller compensation unit 42 abuts against the bottom of the upper movable frame 31, and the bottom of the bending roller compensation frame 41 abuts against the top of the upper roller box 511 of the upper roller system 51. By setting different compensation values ​​for each bending roller compensation unit 42, the elastic deformation of the upper roller system 51 during straightening can be dynamically compensated, and the convexity of the upper roller system 51 can be dynamically adjusted according to the model calculation value. This invention does not limit the structural form of the bending roller compensation unit 42, as long as it can realize the function of multi-point independent compensation. For example, a short-stroke plunger hydraulic cylinder or a wedge pair can be used. This specification uses a short-stroke plunger hydraulic cylinder as an example for illustration. This invention also does not limit the structural form of the flexible locking device.

[0098] Furthermore, such as Figure 8As shown, each bending roll compensation unit 42 is equipped with a position detection element 43, which provides real-time feedback on the actual compensation amount of the bending roll compensation unit 42. Each bending roll compensation unit 42 uses an independent control loop to adjust the compensation value of the bending roll compensation unit individually or in groups, forming a variety of bending roll compensation curves and roll gap patterns.

[0099] Furthermore, such as Figure 9 , Figure 10 As shown, the upper roller system 51 includes an upper roller box 511 with its opening facing downwards. The top surface of the upper roller box 511 abuts against the bottom surface of the multi-point bending roller compensation mechanism 4. Multiple upper support rollers 541 are arranged inside the upper roller box 511, and these rollers support and connect to the upper straightening roller 531. The lower roller system 52 includes a lower roller box 521 with its opening facing upwards. The bottom surface of the lower roller box 521 abuts against the top surface of the frame base 13. Multiple lower support rollers 542 are arranged inside the lower roller box 521, and these rollers support and connect to the lower straightening roller 532. The adaptive roll gap adjustment mechanism 2 adjusts the roll gap between the upper straightening roller 531 and the lower straightening roller 532 in real time to keep it constant. After continuous and repeated bending by the upper straightening roller 531 and the lower straightening roller 532, the residual curvature and residual stress of the steel plate gradually decrease.

[0100] Furthermore, such as Figure 9 As shown, the roller system device 5 also includes an inlet side roller 55 and an outlet side roller 56.

[0101] The lower roller system 52 is located on the frame base 13, and the bottom surface of the lower roller box 521 abuts against the top surface of the frame base 13, transmitting the straightening force of the lower straightening roller 532 to the drive side archway 11 and the operating side archway 12. The upper roller system 51 is fixed to the bending roller compensation frame 41 of the multi-point bending roller compensation mechanism 4 through the connecting rod locking mechanism 33, and the top surface of the upper roller box 511 abuts against the bottom surface of the bending roller compensation frame 41, transmitting the straightening force of the upper straightening roller 531 to the drive side archway 11 and the operating side archway 12.

[0102] Furthermore, such as Figure 1 , Figure 2 As shown, the main drive system 6 includes a frequency converter motor 61, a safety coupling 62, a gear reducer 63 and multiple drive shafts 64 connected in series. The first end of each drive shaft 64 is connected to the upper straightening roller 531 or the lower straightening roller 532 through a spline pair 65 or other means, and the second end of each drive shaft 64 is connected to the output shaft 66 of the gear reducer.

[0103] The main drive system 6 amplifies the output torque of the variable frequency motor 61 through the gear reducer 63 and transmits it to the upper straightening roller 531 and the lower straightening roller 532, driving the steel plate forward for straightening under bending conditions. The safety coupling 62 is set with a protection threshold according to the equipment's load-bearing capacity. If the threshold is exceeded, the safety coupling 62 automatically disengages, cutting off the power source and protecting the equipment. This invention does not limit the structural type or arrangement of the safety coupling 62.

[0104] Furthermore, such as Figure 1 , Figure 2 As shown, the roller changing system 7 includes a drive mechanism 71, a shaft positioning mechanism 72, and a lower roller lifting device 73.

[0105] The working process of the fully hydraulic constant roll gap straightening machine of the present invention is as follows:

[0106] Please refer to Figures 11 to 15 This is a schematic diagram of the working process of the fully hydraulic constant roll gap straightener of the present invention; Figure 13 This is a schematic diagram of the working flat roller gap straightening process of the fully hydraulic constant roller gap straightening machine of the present invention; Figure 14 This is a schematic diagram of the working positive bending roller gap straightening machine of the fully hydraulic constant roller gap straightening machine of the present invention; Figure 15 This is a schematic diagram of the negative bending roller gap straightening process of the fully hydraulic constant roller gap straightening machine of the present invention.

[0107] Since the steel plate 8 may be bent and deformed during rolling, cooling, transportation and shearing, the fully hydraulic constant roll gap straightener of the present invention pre-sets the pressing amount of the adaptive roll gap adjustment mechanism 2 according to the material characteristics, thickness specifications and waviness characteristics of the steel plate 8, and precisely adjusts the position between the upper roll system 51 and the lower roll system 52, so that the upper roll system is horizontal or tilted to a certain extent along the rolling direction and the axis of the straightening roll. When the steel plate 8 passes through the pre-set roll gap, it is bent multiple times, the residual stress is released and the waviness is straightened.

[0108] The straightening force generated during the straightening process is ultimately borne by the high-rigidity frame 1. Under the action of the straightening force, the high-rigidity frame 1 will produce a certain amount of elastic deformation. The amount of deformation is compensated by the fully hydraulic adaptive roll gap adjustment mechanism 2 during straightening to keep the original initial roll gap unchanged.

[0109] Since the steel plate 8 not only has longitudinal bending, but also often exhibits transverse warping, edge waviness, and center waviness, the roll gap set by the adaptive roll gap adjustment mechanism 2 alone is insufficient to eliminate these defects and cannot guarantee the straightening quality of the steel plate. Moreover, the elastic bending deformation of the upper movable crossbeam 3 and the upper roll system 51 under the action of straightening force cannot be compensated by the adaptive roll gap adjustment mechanism 2. The multi-row bending roll compensation unit 42 of the multi-point bending roll compensation mechanism 4 can be adjusted individually or in groups, applying different bending amounts along the width direction of the steel plate to form a variety of bending roll compensation curves and roll gap patterns. This can achieve both flat roll gap straightening and positive or negative bending roll gap straightening, so that the longitudinal fibers of the steel plate are subjected to different degrees of tension and compression during straightening, thereby eliminating the plate shape difference in the width direction of the steel plate and ultimately achieving consistent longitudinal fiber extension, effectively improving straightening accuracy and efficiency.

[0110] As described above, the fully hydraulic constant roll gap straightening machine of the present invention has the following beneficial effects:

[0111] The fully hydraulic constant roll gap straightener of this invention achieves pre-setting and dynamic compensation of the roll gap through an adaptive roll gap adjustment mechanism and a multi-point bending roll compensation mechanism, ensuring a constant roll gap. The hydraulic cylinders that make up the adaptive roll gap adjustment mechanism can be controlled individually or synchronously. The upper roll system is pre-set to have a certain amount of tilting horizontally or along the rolling direction and the axis of the straightening roll. Combined with the individual adjustment of the inlet / outlet side rolls, the roll gap types that can be set are very rich. In actual production, the roll gap type and reduction amount can be set in a targeted manner according to the different wavy shapes of the steel plate. Furthermore, the elastic deformation of the straightener frame can be calculated online based on the straightening force predicted by the control model. This elastic deformation is compensated by the adaptive roll gap adjustment mechanism to maintain the constant roll gap set during the straightening process.

[0112] The bending roll compensation device of the present invention can realize multi-point online bending roll compensation. The device is installed between the upper pressure frame and the upper roll system. Multiple short-stroke servo hydraulic cylinders are arranged in several rows in the bending roll frame. All servo hydraulic cylinders are equipped with displacement sensors and can be controlled individually or in groups. By setting different extension and retraction amounts of each servo hydraulic cylinder, different bending amounts are applied along the width direction of the plate. The bending roll compensation mechanism can dynamically compensate for equipment deformation according to the model calculation value, maintain the constant roll gap, or dynamically adjust the positive and negative bending rolls of the upper roll system for different plate types to improve the straightening quality.

[0113] The roll gap adjustment mechanism of this invention has a micro-adaptive adjustment function. According to the requirements of the straightening process, the upper roll system of a thick plate is set to have a certain amount of forward and backward tilting and left and right tilting during straightening. Conventional designs would cause the HAGC hydraulic cylinder of the roll gap adjustment mechanism to tilt under stress, and the pressure rod inside the hydraulic cylinder would generate a bending moment on the piston rod of the HAGC hydraulic cylinder, aggravating the wear of the HAGC hydraulic cylinder seals and reducing the service life of the HAGC hydraulic cylinder. This invention designs the top of the pressure rod as a spherical adaptive structure. This structure ensures that the pressure rod only bears axial pressure during the tilting straightening of the upper roll system, avoiding the pressure rod generating an additional bending moment on the piston rod.

[0114] The high-rigidity frame of this invention adopts an integral cast steel closed structure. The straightening force generated during the straightening of the steel plate is transmitted to the two arches of the high-rigidity frame through two paths, the upper roller system and the lower roller system, respectively. The straightening force forms a stress closed loop along the arch window and reaches equilibrium. When not straightening, the entire frame is in a "zero stress" state. In contrast, conventional prestressed frames have very large pre-tension internal stress when not straightening, and are in a state of superposition of straightening force and pre-tension force stress during straightening. The high-rigidity frame of this invention is always in a low stress or zero stress state, which is a great improvement compared with the stress state of traditional frames, and avoids permanent deformation of the equipment after long-term use.

[0115] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A full hydraulic constant gap straightener characterized by, include, The high-rigidity frame is designed as an integral, enclosed load-bearing frame structure. The roller system is installed on the high-rigidity frame and includes an upper roller system and a lower roller system. The straightening force is transmitted to the high-rigidity frame through the upper roller system and the lower roller system. An upper movable crossbeam is located above the upper roller system and is vertically movable and connected to the high-rigidity frame. The upper movable crossbeam can transmit the straightening force of the upper roller system to the high-rigidity frame. An adaptive roll gap adjustment mechanism is used to provide straightening force and adaptively adjust the roll gap between the upper and lower roll systems. It includes multiple independent and adaptively adjustable hydraulic cylinders symmetrically arranged on the transmission and operating sides of a high-rigidity frame. The top end of each hydraulic cylinder is connected to the high-rigidity frame, and the bottom end of each hydraulic cylinder abuts against the top end of the upper movable crossbeam. The adaptive roll gap adjustment mechanism enables the preset setting of the roll gap. The multi-point bending roller compensation mechanism has its top and bottom ends fixedly connected to the upper movable crossbeam and the upper roller system, respectively. It includes multiple rows of parallel bending roller compensation units, each of which is independently set up. It is used to dynamically compensate for the elastic deformation of the upper roller system during straightening and to dynamically adjust the convexity of the upper roller system. The main drive system is located on the drive side of the fully hydraulic constant roll gap straightener and is connected to the roller system to drive the steel plate forward and straighten it under bending conditions. A roller changing system for replacing the roller system; The hydraulic cylinders are individually or synchronously controlled by a hydraulic servo system. The hydraulic cylinders drive the upper movable crossbeam, the multi-point bending roller compensation mechanism and the upper roller system to move up and down to adjust the position of the upper roller system relative to the lower roller system. The hydraulic cylinder includes a cylinder body, a piston rod that is slidably and sealed from the bottom end of the cylinder body, a pressure rod that is inserted inward from the bottom end of the piston rod, an adaptive pad is provided on the top of the inner wall of the cylinder body, a spherical groove is provided inward from the bottom surface of the adaptive pad, a spherical structure that can abut against the spherical groove is provided on the top end of the pressure rod, and the bottom end of the pressure rod abuts against the upper movable crossbeam. Displacement sensors and pressure sensors are installed inside the cylinder.

2. The full hydraulic constant gap leveller according to claim 1, characterized in that, The high-rigidity frame also includes a frame base, on both sides of which are provided a transmission side archway and an operating side archway. A connecting beam connects the transmission side archway and the operating side archway. A balancing lifting mechanism is provided on the side of the transmission side archway near the operating side archway and on the side of the operating side archway near the transmission side archway. The top of the upper movable beam is suspended from the bottom of the balancing lifting mechanism. The hydraulic cylinders of the adaptive roll gap adjustment mechanism and the balancing lifting mechanism work together to adjust the position of the upper movable beam in the vertical direction.

3. The full hydraulic constant gap straightener according to claim 2, characterized in that The transmission side pailou and the operation side pailou are symmetrically provided with windows, the top end of the window of the transmission side pailou is a first upper crossbeam, the bottom end of the window of the transmission side pailou is a first lower crossbeam, and the two sides of the window of the transmission side pailou are first vertical columns; the top end of the window of the operation side pailou is a second upper crossbeam, the top end of the window of the operation side pailou is a second lower crossbeam, and the two sides of the window of the operation side pailou are second vertical columns; the self-adaptive roll gap adjusting mechanism is arranged in the window of the transmission side pailou and the operation side pailou, the top end of each hydraulic cylinder abuts against the first upper crossbeam or the second upper crossbeam, the upper movable crossbeam, the multi-point bending roll compensation mechanism and the upper roll system move up and down in the window; the two sides of the rack base are supported on the first lower crossbeam and the second lower crossbeam, and the lower roll system is arranged on the rack base.

4. The full hydraulic constant gap straightener according to claim 3, characterized in that First, second and third rows of wear-resistant lining plates are arranged on the two inner side walls of the window of the transmission side pailou and the operation side pailou in a spaced manner from top to bottom; the first row of wear-resistant lining plates is arranged in a stepped structure with a bevel smoothly transitioning to the side wall of the window, and the thickness of the first row of wear-resistant lining plates increases from bottom to top; the second and third rows of wear-resistant lining plates are arranged in a plane toward the side wall of the window; the first and second rows of wear-resistant lining plates are used for positioning and guiding the upper movable crossbeam, the multi-point bending roll compensation mechanism and the upper roll system; and the third row of wear-resistant lining plates can be used for positioning of the lower roll system.

5. The full hydraulic constant gap straightener according to claim 2, wherein The upper movable crossbeam comprises an upper movable frame, a self-weight balance connecting frame is arranged at the top end of the upper movable frame, the self-weight balance connecting frame is connected with the balance lifting mechanism, pressure-down supporting surfaces are arranged at the two sides of the top end of the upper movable frame, and the bottom end of the hydraulic cylinder abuts against the pressure-down supporting surfaces; a flexible locking device is arranged at the bottom end of the upper movable frame, the multi-point bending roll compensation mechanism is connected with the flexible locking device; guide wear-resistant sliding plates are arranged at the two sides of the bottom end of the upper movable frame; connecting rod locking mechanisms are arranged at the two sides of the upper movable frame, and the upper roll system is fixedly connected with the multi-point bending roll compensation mechanism through the connecting rod locking mechanisms.

6. The full hydraulic constant gap leveller according to claim 5, characterized in that The multi-point bending roll compensation mechanism comprises a bending roll compensation frame, and each bending roll compensation unit is arranged in multiple rows along the axial direction of the roll system device in the bending roll compensation frame; the bending roll compensation frame is connected with the flexible locking device, and the top of each bending roll compensation unit abuts against the bottom surface of the upper movable frame.

7. The full hydraulic constant gap straightener according to claim 5, wherein Each bending roll compensation unit is provided with a position detection element, which feeds back the actual compensation amount of the bending roll compensation unit in real time; each bending roll compensation unit adopts a separate control loop to adjust the compensation value of the bending roll compensation unit individually or in groups.

8. The full hydraulic constant gap straightener according to claim 2, wherein The upper roller system comprises an upper roller box opened downward, a top surface of the upper roller box abutting against a bottom surface of the multi-point bending roller compensation mechanism, a plurality of upper supporting rollers arranged in the upper roller box, and a plurality of upper straightening rollers supported by the upper supporting rollers; the lower roller system comprises a lower roller box opened upward, a bottom surface of the lower roller box abutting against a top surface of the frame base, a plurality of lower supporting rollers arranged in the lower roller box, and a plurality of lower straightening rollers supported by the lower supporting rollers; and the self-adaptive roller gap adjustment mechanism adjusts the roller gap between the upper straightening rollers and the lower straightening rollers in real time to keep the roller gap constant.

9. The full hydraulic constant gap straightener according to claim 8, characterized in that The roller system device further comprises an inlet side roller and an outlet side roller.

10. The full hydraulic constant gap straightener according to claim 8, characterized in that The main transmission system comprises a variable frequency motor, a safety coupling, a gear reducer and a plurality of transmission shafts connected in series, and a first end of each transmission shaft is connected with the upper straightening roller or the lower straightening roller.

11. The full hydraulic constant gap straightener according to claim 1, characterized in that The roller changing system comprises a driving mechanism, a shaft positioning mechanism and a lower roller system lifting device.

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