Multi-functional testing machine group

Abstract

The utility model belongs to the field of rolling technology relates to a kind of multifunctional testing unit, including left coiler, left side platform device, multifunctional rolling mill, right side platform device, right coiler, left side single piece feeding device and right side single piece feeding device, and the multifunctional rolling mill can switch between four-roll system and six-roll system;When the multifunctional rolling mill is six-roll system, the left coiler, left side platform device, multifunctional rolling mill, right side platform device and right coiler are sequentially arranged along the rolling direction to form coiled rolling mill group;When the multifunctional rolling mill is four-roll system, the left side single piece feeding device, multifunctional rolling mill and right side single piece feeding device are sequentially arranged along the rolling direction to form single piece rolling mill group.The utility model integrates single piece rolling / flat and coiled rolling / flat function, not only improves equipment utilization, also reduces construction and use cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of steel rolling technology and relates to a multifunctional test unit. BACKGROUND

[0002] In the steel industry, strip steel cold rolling and strip steel flattening are key links in the production of high-quality steel. In order to research and verify new processes and methods in this field, pilot tests are particularly important. Pilot tests can comprehensively evaluate and optimize new materials and new processes under conditions close to actual production environments, thereby providing reliable technical basis for large-scale production. However, test units in reality often face many challenges. Because there are many types of pilot tests, the parameters such as raw steel grade, incoming material thickness, and finished product thickness are different, therefore, the test unit needs to have high adaptability and flexibility. However, traditional test units are usually designed to be highly targeted and can only meet the test requirements of specific types. When different types or specifications of tests need to be performed, the unit often needs to be adjusted significantly or the equipment needs to be replaced, which not only consumes time and effort, but also greatly increases the test cost.

[0003] In addition, in order to cope with the increasingly diversified test requirements, an ideal test unit should have multifunctionality. However, traditional steel rolling test equipment is usually designed to have a single function, such as being able to perform only coiled rolling or single-piece flattening. This design limits the scope of application of the equipment and cannot meet the demand of quickly switching between rolling and flattening modes on the same equipment. In actual operation, when it is necessary to switch from one mode of operation to another, a lot of time and manpower are often consumed for equipment adjustment or replacement, which seriously affects the test efficiency and flexibility.

[0004] On the other hand, existing equipment also has many problems when processing single-piece materials. In particular, the stability and accuracy of the feeding device are often insufficient. During the rolling or flattening process, accurate feeding of single-piece materials is the key to ensuring the reliability of test results. However, due to design defects or insufficient control accuracy of the feeding device, problems such as material deviation or poor conveying may occur. These problems not only affect the smooth progress of the test, but also may cause deviation of the test results, thereby reducing the reliability and accuracy of the test.

[0005] Therefore, it is particularly important to develop a multifunctional test unit that can quickly switch between modes of operation and adapt to various process requirements. Such a unit should have high flexibility and multifunctionality and be able to easily cope with test requirements of different raw steel grades, incoming material thicknesses, and finished product thicknesses. At the same time, its feeding device should have good stability and accuracy to ensure accurate feeding and smooth conveying of single-piece materials. Such a multifunctional test unit not only can improve test efficiency and accuracy, but also can greatly reduce test cost, providing strong technical support for new material development, new process verification, and product quality control. Utility model content

[0006] Therefore, the utility model discloses a kind of multifunctional test unit, by modular design and quick switching mechanism, realize the rolling of roll, the flattening of roll, single piece rolling and single piece flattening etc.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A kind of multifunctional test unit, including left coiler, left side platform device, multifunctional rolling mill, right side platform device, right coiler, left side single piece feeding device and right side single piece feeding device, and the multifunctional rolling mill can be switched between four-roll system and six-roll system;

[0009] When the multifunctional rolling mill is six-roll system, the left coiler, left side platform device, multifunctional rolling mill, right side platform device and right coiler are sequentially arranged along the rolling direction, to form the rolling of roll unit;

[0010] When the multifunctional rolling mill is four-roll system, the left side single piece feeding device, multifunctional rolling mill and right side single piece feeding device are sequentially arranged along the rolling direction, to form single piece rolling unit.

[0011] Further, the multifunctional rolling mill includes:

[0012] frame;

[0013] four-roll system, consisting of a pair of flattening roller and a pair of shared support roller;

[0014] six-roll system, consisting of a pair of work roller, a pair of intermediate roller and a pair of shared support roller;

[0015] roll changing device, configured at one side of the bottom of frame, for supporting the free switching of four-roll system and six-roll system in the frame;

[0016] Wherein, the sum of the diameter of intermediate roller and work roller in six-roll system is equal to the diameter of flattening roller in four-roll system, and the bearing seat of intermediate roller, the bearing seat of work roller and the bearing seat of flattening roller adopt equal width design, to realize the free switching of four-roll system and six-roll system in frame.

[0017] Further, the multifunctional rolling mill further includes:

[0018] work roller positive bending roller arranged in frame;

[0019] Intermediate roller / flatting roller positive bending roller shared by intermediate roller and flattening roller, and the opening width of intermediate roller / flatting roller positive bending roller and work roller positive bending roller is same.

[0020] Further, the multi-functional rolling mill further comprises:

[0021] Four sets of intermediate roller axial transverse moving and pulling devices are fixedly installed on one side of the frame to correspond to the upper and lower intermediate rollers in the intermediate rollers respectively, thereby realizing the axial moving and pulling of the intermediate rollers;

[0022] The intermediate roller / planishing roller positive bending roller is fixedly installed in the frame to keep the intermediate roller / planishing roller positive bending roller stationary when the intermediate roller is transversely moved and pulled, thereby reducing the width design size of the intermediate roller / planishing roller positive bending roller.

[0023] Further, the intermediate roller axial transverse moving and pulling device comprises an oil cylinder, a frame, a sliding block and a locking pin, the frame is fixedly installed on the frame, the oil cylinder adopts an inverted structure and is internally provided with a displacement sensor, the sliding block is slidingly installed in the frame and is connected with the piston of the oil cylinder to drive the sliding transverse movement;

[0024] Both sides of the bearing seat of the intermediate roller are provided with a connecting block to connect the two intermediate roller axial transverse moving and pulling devices respectively, a first pin hole is arranged on the connecting block, a second pin hole corresponding to the first pin hole is arranged in the sliding block, and the locking pin penetrates through the first pin hole and the second pin hole to lock the bearing seat of the intermediate roller and the sliding block, thereby driving the axial transverse movement of the intermediate roller by the oil cylinder.

[0025] Further, the left and right platform devices are the same in structure and each comprises a mounting base, a platform sliding frame body slidingly arranged on the mounting base and a hydraulic oil cylinder for driving the platform sliding frame body to slide transversely to push the left and right platform devices to switch between the working position and the standby position;

[0026] A single-piece feeding device mounting hole is arranged on the mounting base to mount the left and right single-piece feeding devices on the mounting base when the multi-functional rolling mill is a four-roller system.

[0027] A swing guide plate for connecting the coiler and the multi-functional rolling mill and a speed measuring roller, a tension meter and a thickness gauge for detecting the parameters of the steel coil are arranged on the platform sliding frame body.

[0028] Further, the left and right single-piece feeding devices are the same in structure and each comprises:

[0029] A fixed sliding rail is detachably installed on the mounting base on both sides of the multi-functional rolling mill;

[0030] A sliding frame body is slidingly arranged on the fixed sliding rail;

[0031] A conveying belt is arranged on the sliding frame body to convey the strip to the entrance of the rolling mill;

[0032] A pressing pattern roller device is arranged above the conveying belt and is arranged at one end of the conveying belt close to the rolling mill;

[0033] An elastic sliding plate is arranged below the pressing pattern roller device and is arranged inside the sliding frame body and forms a clamping space with the pressing pattern roller device to clamp the conveying belt;

[0034] A fixed sliding seat is arranged on the frame of the multifunctional rolling mill and is in sliding connection with the sliding frame body;

[0035] A push-pull oil cylinder is connected to the fixed sliding seat and the sliding frame body at two ends to drive the sliding frame body to move along the fixed sliding rail to approach or move away from the rolling mill.

[0036] Further, the pressing pattern roller device comprises roller seats arranged on the sliding frame body and located on both sides of the conveying belt and a plurality of pattern rollers rotatably connected between the roller seats to press the strip on the conveying belt.

[0037] Further, the elastic sliding plate comprises a sliding plate and a fixed seat arranged at the bottom of the sliding plate and fixedly connected with the sliding frame body, the fixed seat is connected with the sliding plate through an extension sleeve, and a spring is arranged in the extension sleeve to adapt to strips of different thicknesses.

[0038] Further, a belt tensioning device is arranged, the belt tensioning device comprises a tensioning seat fixedly arranged in the sliding frame body and two fixed rollers and an adjustable roller rotatably arranged between the tensioning seat, the adjustable roller is located between the two fixed rollers, and the conveying belt arranged on the lower side of the sliding frame body is sequentially wound around the two fixed rollers and the adjustable roller, and the height of the adjustable roller is adjusted to adjust the tensioning force of the conveying belt.

[0039] The adjustable roller is vertically arranged in the tensioning seat and is in threaded connection with an adjusting screw vertically clamped in the tensioning seat, and the height of the adjustable roller is adjusted by rotating the adjusting screw.

[0040] The beneficial effects of the utility model lie in:

[0041] 1. The technical scheme provides a multifunctional test unit and a test method, which is equipped with four / six-roll double set of rolls, and can flexibly cope with the cold rolling and skin pass test requirements of small size and small batch of various metal materials such as plain carbon steel, stainless steel, high-strength steel, automobile plate, silicon steel and aluminum alloy. Compared with the limitation of single function of traditional test equipment, the unit innovatively integrates single sheet rolling and coiled rolling functions, not only improves the utilization rate of the equipment, but also reduces the construction and use cost. The double set of roll design can quickly adapt to different test modes, providing an integrated solution for various process research, showing excellent practicality and economic benefit, and is especially suitable for scientific research institutions and enterprises to carry out diversified tests.

[0042] 2. In the six-roll state, the unit is a typical UC rolling mill, which uses smaller work rolls and has the ability to roll extremely thin strips, meeting the test requirements of high-precision thin strip production. The unit is equipped with various shape adjusting means (such as intermediate roll transverse movement and bending roll device), which significantly enhances the shape control ability, ensuring the high precision and stability of the rolling process. In the four-roll state, the unit is converted into a typical skin pass mill, which uses large-diameter skin pass rolls designed for studying skin pass process, skin pass roll roughening technology and the influence of the surface morphology of the roughened roll on the surface of the steel plate and the subsequent process. This innovative design of dual-mode switching makes the unit perform well in thin strip rolling and skin pass process verification, providing a reliable experimental platform for process optimization.

[0043] 3. The multifunctional rolling mill in the test unit realizes the free switching of four-roll and six-roll modes through its unique double-roll design and efficient component sharing concept. The equipment can flexibly cope with various process requirements such as cold rolling and skin pass, greatly improving the versatility, especially suitable for pilot test and other diversified scenarios. The shared design of backup rolls and bending roll devices reduces redundant components, not only reducing manufacturing and maintenance costs, but also optimizing the equipment structure through fixed bending roll cylinders and compact roll changing devices, reducing the floor space. This compact design not only meets the high requirements of modern production for space, but also reflects the foresight and originality of technology, bringing a new breakthrough to traditional rolling equipment;

[0044] The single sheet feeding device firmly presses the single sheet strip on the conveying belt through the pressing flower roll device, thereby significantly increasing the friction between the strip and the belt. This design not only enhances the conveying force and ensures the stability of the strip during transportation, but also forms a certain tension between the strip and the belt when the strip enters the roll, effectively improving the flatness of rolling, reducing the wave or warping phenomenon. This innovative pressing method optimizes the conveying effect, directly improves the precision and surface quality of the rolling products, and reflects the practical value of the technical scheme in improving production quality.

[0045] The other advantages, objects, and features of the present application will be understood and appreciated by those skilled in the art upon consideration of the following detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings. The following detailed description of the preferred embodiment is made with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to make the objectives, technical solutions, and advantages of the present application clearer, the following will make a preferred detailed description of the present application with reference to the accompanying drawings, in which:

[0047] Figure 1 is a planar layout schematic view of a multifunctional test machine group in a coil rolling mill group state in the embodiment;

[0048] Figure 2 is a front view of the multifunctional test machine group in the coil rolling mill group state in the embodiment;

[0049] Figure 3 is a planar layout schematic view of a multifunctional test machine group in a single-plate rolling mill group state in the embodiment;

[0050] Figure 4 is a front view of the multifunctional test machine group in the single-plate rolling mill group state in the embodiment;

[0051] Figure 5 is a planar schematic view of a left platform device in the embodiment;

[0052] Figure 6 is a planar schematic view of a left platform device in the embodiment;

[0053] Figure 7 is a structural schematic view of a multifunctional rolling mill in the embodiment;

[0054] Figure 8 is a state view of the multifunctional rolling mill in the embodiment in a six-roller rolling state and a four-roller flattening state respectively;

[0055] Figure 9 is a structural schematic view of the multifunctional rolling mill in the embodiment in a six-roller rolling state and a four-roller flattening state respectively;

[0056] Figure 10 is a structural schematic view of a positive bending roller in the multifunctional rolling mill in the embodiment;

[0057] Figure 11 is an axonometric view of an intermediate roller axial transverse shifting and pulling device in the multifunctional rolling mill in the embodiment;

[0058] Figure 12 is a sectional view of the intermediate roller axial transverse shifting and pulling device in the multifunctional rolling mill in the embodiment;

[0059] Figure 13 Structure diagram of the middle intermediate roll in the multifunctional rolling mill in the embodiment;

[0060] Figure 14 Structure diagram of the rolling line adjusting device in the multifunctional rolling mill in the embodiment;

[0061] Figure 15 Structure diagram of the roll changing device in the multifunctional rolling mill in the embodiment;

[0062] Figure 16 Structure diagram of the left single sheet feeding device in the embodiment;

[0063] Figure 17 Axonometric view of the left single sheet feeding device in the embodiment;

[0064] Figure 18 Structure diagram of the belt tensioning device in the embodiment;

[0065] Figure 19 Side sectional view of the belt tensioning device in the embodiment;

[0066] Figure 20 Axonometric view of the centering device in the embodiment;

[0067] Figure 21 Axonometric view of the pressure flower roll device in the embodiment;

[0068] Figure 22 Structure diagram of the elastic slide plate in the embodiment.

[0069] Reference numerals: left coiler 1, left platform device 2, multifunctional rolling mill 3, right platform device 4, right coiler 5, left single sheet feeding device 6, right single sheet feeding device 7;

[0070] Left platform device 2: swing guide plate 21, platform turning roll 22, speed measuring roll 23, tension meter 24, thickness gauge 25, platform centering device 26, mounting base 27, platform sliding frame body 28, single sheet feeding device mounting hole 29, hydraulic oil cylinder 210, slide rail 211;

[0071] Multifunctional rolling mill 3: motor 31, gear box 32, transmission shaft 33, roll shaft axial transverse shifting and pulling device 35, press-down oil cylinder 36, roll 37, roll changing device 38, rolling line adjusting device 39;

[0072] Roll shaft axial transverse shifting and pulling device 35: oil cylinder 351, frame 352, sliding block 353, locking pin 354, sliding sleeve 355, connecting block 356, first pin hole 357;

[0073] Roller 37: upper common support roller 371, lower common support roller 372, upper intermediate roller 373, lower intermediate roller 374, upper working roller 375, lower working roller 376, upper smoothing roller 377, lower smoothing roller 378, upper intermediate roller / smoothing roller positive bending cylinder block 379, lower intermediate roller / smoothing roller positive bending cylinder block 3710, upper working roller positive bending cylinder block 3711, lower working roller positive bending cylinder block 3712;

[0074] Roll changing device 38: high roll changing rack 381, low roll changing rack 382, transmission motor 383;

[0075] Rolling line adjusting device 39: encoder 391, lead screw 392, lifting platform 393, moving wedge 394, fixed wedge 395, copper nut 396, hydraulic motor 397;

[0076] Left single-piece feeding device 6: fixed slide rail 61, motor and transmission roller 62, conveying belt 63, belt tensioning device 64, centering device 65, compression pattern roller device 66, push-pull oil cylinder 67, fixed sliding seat 68, sliding frame body 69, roller 610, elastic sliding plate 611;

[0077] Motor and transmission roller 62: motor 621, transmission roller 622;

[0078] Belt tensioning device 64: tensioning seat 641, fixed roller 642, adjusting roller 643, adjusting bolt 644;

[0079] Centering device 65: centering hydraulic motor 651, centering lead screw 652, centering nut 653, right push plate 654, left push plate 655, guide rod 656, fixed seat 657;

[0080] Compression pattern roller device 66: roller seat 661, pattern roller 662, centering adjustment cross bar 663, centering adjustment baffle 664, outlet pressing plate 665;

[0081] Elastic sliding plate 611: sliding plate 6111, fixed seat 6112, telescopic sleeve 6113, spring 6114. DETAILED DESCRIPTION

[0082] The embodiments of the present application will be described in detail with specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the features in the following examples and embodiments can be combined with each other without conflict.

[0083] Wherein, the drawings are only for example illustration, the representation is only schematic diagram, and cannot be understood as the limitation to the utility model; in order to better illustrate the embodiment of the utility model, some components of the drawings can be omitted, enlarged or reduced, and do not represent the size of actual product; for the person skilled in the art, it is understandable that some well-known structures in the drawings and its description can be omitted.

[0084] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and therefore the terms describing the position relationship in the drawings are only for example illustration, and cannot be understood as the limitation to the utility model, for the person skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0085] Please refer to Figures 1-22 It is a kind of multifunctional testing unit, including left coiler 1, left platform device 2, multifunctional rolling mill 3, right platform device 4, right coiler 5, left single piece feeding device 6 and right single piece feeding device 7, and the multifunctional rolling mill 3 can be switched between four-roll system and six-roll system;

[0086] When the multifunctional rolling mill 3 is six-roll system, the left coiler 1, left platform device 2, multifunctional rolling mill 3, right platform device 4 and right coiler 5 are sequentially arranged along the rolling direction to form a coiled rolling mill unit;

[0087] When the multifunctional rolling mill 3 is four-roll system, the left single piece feeding device 6, multifunctional rolling mill 3 and right single piece feeding device 7 are sequentially arranged along the rolling direction to form a single piece rolling mill unit.

[0088] The multifunctional rolling mill includes

[0089] Rack 34;

[0090] Four-roll system, which is composed of a pair of smoothing rollers and a pair of shared support rollers;

[0091] Six-roll system, which is composed of a pair of work rollers, a pair of intermediate rollers and a pair of shared support rollers;

[0092] Roll changing device 38 is arranged on one side of the bottom of the rack, which is used to support the free switching of four-roll system and six-roll system in the rack;

[0093] In the six-roll system, the sum of the diameters of the intermediate roll and the working roll is equal to the diameter of the leveling roll in the four-roll system. Furthermore, the bearing seats of the intermediate roll, the working roll, and the leveling roll are designed with equal width to enable free switching between the four-roll system and the six-roll system in the frame.

[0094] The left coiler 1 and the right coiler 5 have the same structure, mainly consisting of a motor, reducer, drum, pressure roller, etc., and are equipped with a special loading and unloading lifting trolley. Their function is to apply tension to the strip steel and play an auxiliary role in rolling. This application adopts the coiler commonly used in the prior art, so it will not be described in detail.

[0095] The left platform device 2 and the right platform device 4 have the same structure and are transitional devices connecting the coiler to the multi-functional rolling mill. This application adopts the platform device commonly used in the prior art, so it will not be described in detail. It mainly includes a swing guide plate 21, a platform turning roller 22 and a platform centering device 26 for connecting the coiler and the multi-functional rolling mill, and a speed measuring roller 23, a tension meter 24 and a thickness gauge 25 for detecting the parameters of the steel coil.

[0096] The main difference from other existing technologies is that it also includes a mounting base 27, a platform sliding frame 28 slidably arranged on the mounting base 27, and a hydraulic cylinder 210 for driving the platform sliding frame 28 to slide laterally. The mounting base 27 and the platform sliding frame 28 are laterally slidably connected by a slide rail 211. The swing guide plate 21, platform steering roller 22, speed measuring roller 23, tension meter 24, thickness gauge 25, and platform centering device 26 are all arranged on the platform sliding frame 28. The platform device is driven by the hydraulic cylinder 210 to switch between the working position and the standby position. Bolt fastening positions are provided in both the working position and the standby position to fix the platform sliding frame 28.

[0097] Furthermore, the mounting base 27 is provided with a single-piece feeding device mounting hole 29, so that when the multi-functional rolling mill is a four-roll system, the left single-piece feeding device 6 and the right single-piece feeding device 7 are respectively installed on the corresponding mounting base.

[0098] The left-side single-piece feeding device 6 and the right-side single-piece feeding device 7 have the same structure, both including:

[0099] The fixed slide rail 61 is detachably mounted on the mounting base 27 on both sides of the multi-functional rolling mill;

[0100] The sliding frame 69 is slidably mounted on the fixed slide rail 61;

[0101] A conveyor belt 63 is arranged around the sliding frame 69 to transport the strip to the entrance of the multi-functional rolling mill;

[0102] A pressing roller device 66 is installed above the conveyor belt and arranged at one end of the conveyor belt near the mill;

[0103] The elastic slide plate 611 is arranged below the pressing roller device 66 and installed inside the sliding frame 69, forming a clamping space with the pressing roller device 66 to clamp the conveyor belt.

[0104] Fixed slide 68 is installed on the stand of the rolling mill;

[0105] The push-pull cylinder 67 is connected to a fixed slide block 68 and a sliding frame 69 at both ends, respectively, to drive the sliding frame 69 to move closer to or away from the rolling mill along the fixed slide rail 61.

[0106] Example 1

[0107] This embodiment demonstrates a specific application of a multi-functional rolling mill with a six-roll system, which is particularly suitable for high-precision rolling and shape control of strip steel in cold rolling processes.

[0108] 1. The equipment configuration is as follows:

[0109] 1.1 Configuration of the six-roll system

[0110] The multi-functional rolling mill of this embodiment includes a stand 34 and a six-roll system. The six-roll system consists of the following components:

[0111] Work rolls: Upper work roll 375 and lower work roll 376, with specifications of Φ100×500mm, material of 9Cr2Mo, hardness of HS95±2, surface roughness of Ra0.4-0.8, bearing housing material of 35CrMo forged steel, and bearings using needle roller + thrust ball bearings.

[0112] Intermediate rollers: Upper intermediate roller 373 and lower intermediate roller 374, with specifications of Φ320×500mm, material of 9Cr2Mo, hardness of HS85±2, surface roughness of Ra0.4-0.8, bearing housing material of 35CrMo forged steel, and bearings using tapered roller bearings.

[0113] Common support rollers: Upper common support roller 371 and lower common support roller 372, with specifications of Φ630×450mm, material of 70Cr3Mo, hardness of HS75±2, surface roughness of Ra0.8-1.6, bearing housing material of ZG35, and bearings using cylindrical roller bearings.

[0114] Transmission system: The upper intermediate roller 373 and the lower intermediate roller 374 serve as transmission rollers, and are connected in sequence to the gearbox 32 and the motor 31 (power 400KW) through the transmission shaft 33 to realize power transmission.

[0115] The bending roller device includes a working roller bending roller (with an upper working roller bending cylinder block 3711 and a lower working roller bending cylinder block 3712, cylinder diameter Φ50mm, stroke 31mm), an upper intermediate roller / leveling roller bending roller (with an upper intermediate roller / leveling roller bending cylinder block 379, cylinder diameter Φ65mm, stroke 54mm), and a lower intermediate roller / leveling roller bending roller (with a lower intermediate roller / leveling roller bending cylinder block 3710, cylinder diameter Φ65mm, stroke 54mm).

[0116] Pressing cylinder: The hydraulic automatic thickness control pressing cylinder is one of the most important core actuators in the automatic sheet and strip thickness control system. It controls the displacement and pressure of the hydraulic cylinder through an electro-hydraulic servo valve, causing the rolls to move up and down, thereby achieving precise control of the roll gap and ultimately precise control of the sheet thickness. Its characteristics include high response frequency, low friction, and high control accuracy. The pressing cylinder uses a built-in high-precision displacement sensor to detect the piston displacement, and is also equipped with a pressure sensor. The cylinder type is a piston cylinder, and the piston size (cylinder diameter)... Stroke: Φ450×50mm, Working oil pressure: 20MPa.

[0117] 1.2 Configuration of Platform Device and Winding Machine

[0118] The left platform device 2 and the right platform device 4 have the same structure. Taking the left platform device 2 as an example, the length of the platform steering roller 22 is... Diameter 500 φ230mm; Length of speed measuring roller 23 Diameter 500 φ200mm; the alignment range of the platform alignment device 26 is 120-400mm, and the drive device is an oil motor; the hydraulic cylinder 210 has a stroke of 2000m and a piston diameter of φ100mm;

[0119] The left winder 1 and the right winder 5 have the same structure. Taking the left winder 1 as an example, the winder motor power is 75KW, the maximum tension of the winder is 20KN, the winder drum diameter is φ508mm, the maximum drum speed is 100rpm, and the effective drum length is 530mm.

[0120] 1.3 Configuration of Single-piece Feeding Device

[0121] The left-side single-piece feeding device 6 and the right-side single-piece feeding device 7 have the same structure and are used to feed single pieces of strip into the rolling mill for rolling or leveling. Taking the left-side single-piece feeding device 6 as an example, it includes the following components: fixed slide rail 61, sliding frame 69, conveyor belt 63, pressing roller device 66, elastic slide plate 611, fixed slide block 68, push-pull cylinder 67, and other auxiliary components.

[0122] Fixed slide rail 61 and sliding frame 69: The fixed slide rail 61 is made of high-strength steel, is long and narrow, and is fixedly installed on the inlet side of the mill stand as the supporting foundation for the entire device. The sliding frame 69 is a rectangular frame structure, which can be slidably connected to the fixed slide rail 61 by a slider or roller 610 to ensure that it can move smoothly on the fixed slide rail 61.

[0123] Conveyor belt 63: The conveyor belt 63 is made of wear-resistant rubber material and is wrapped around the sliding frame 69. Its width is 500mm, and its length is approximately 3000mm, designed according to the dimensions of the sliding frame 69. The conveyor belt 63 is driven by a drive roller 622 and a guide roller. The drive roller 622 is installed at the end of the sliding frame 69 furthest from the rolling mill, and the guide roller is installed at the end closest to the rolling mill. The drive roller 622 has a knurled surface, a diameter of Ø100mm, and a length of 380mm to increase friction with the conveyor belt 63. The guide roller has a diameter of Ø80mm and a length of 380mm. The drive roller 622 is connected to a motor 621 mounted on the sliding frame 69 via a roller chain. The motor 621 has a power of 1.1kW, a speed of 1400 rpm, and controls the belt conveying speed from 0-45m / min.

[0124] The pressing roller device 66 is installed above the conveyor belt 63, near one end of the mill, to press the strip onto the conveyor belt 63. This device includes roller seats 661 and patterned rollers 662. Two roller seats 661 are fixed to the sliding frame 69 on either side of the conveyor belt 63. Two patterned rollers 662 are rotatably connected between the roller seats 661 via bearings. Each patterned roller 662 has a roller shaft diameter of Ø40mm, a roller wheel diameter of Ø80mm, and a length of 450mm. The roller wheel surface is patterned to enhance grip. Each patterned roller has three roller wheels. Furthermore, a centering adjustment crossbar 663 is provided between the roller seats 661. The centering adjustment crossbar 663 has a slotted hole, and a centering adjustment baffle 664 is slidably connected to it via bolts. The centering adjustment baffle 664 can be adjusted left and right along the slotted hole, with a centering range of 100-380mm, preventing the strip from deviating during conveying.

[0125] Furthermore, an outlet pressure plate 665 is provided at the outlet of the pressing roller device 66 to prevent the conveyor belt from warping and further ensure the reliability of the conveyor belt.

[0126] Elastic slide plate 611: The elastic slide plate 611 is arranged below the pressing roller device 66 and installed inside the sliding frame 69, forming a clamping space with the pressing roller 662 to clamp the conveyor belt 63. The elastic slide plate 611 includes a slide plate 6111 and a fixing seat 6112. The slide plate 6111 is a flat steel plate, 450mm long and 500mm wide; the fixing seat 6112 is welded to the sliding frame 69 and connected to the slide plate 6111 through a telescopic sleeve 6113. A spring 6114 is provided inside the telescopic sleeve 6113. The elastic coefficient of the spring 6114 is 50N / mm, allowing the slide plate 6111 to float up and down by about 20mm to accommodate different belt thicknesses between 2mm and 10mm.

[0127] Fixed slide 68 and push-pull cylinder 67: The fixed slide 68 is a steel component, fixed to the mill stand and slidably connected to the sliding frame, also serving to support the sliding frame. The push-pull cylinder 67 is a hydraulic drive device with a cylinder diameter of Ø80mm and a stroke of 1000mm. One end is hinged to the fixed slide 68, and the other end is hinged to the sliding frame 69, used to drive the sliding frame 69 to move closer to or away from the mill along the fixed slide rail 61.

[0128] Centering device 65: Centering device 65 is located on the side of the pressing roll device 66 away from the mill, and is used to adjust the strip to the center position of the conveyor belt 63. This device includes a centering hydraulic motor 651, a centering screw 652, a centering nut 653, a right push plate 644, a left push plate 655, a guide rod 656, and fixed seats 657. The two fixed seats 657 are fixed to the sliding frame 69, located on both sides of the conveyor belt 63. The centering screw 652 is 1000mm long, with left-hand and right-hand threads at both ends, and is connected to the centering hydraulic motor 651 (3kW power). The guide rod 656 is parallel to the centering screw 652 and assists in the movement of the right push plate 644 and the left push plate 655. The right push plate 644 and the left push plate 655 are threadedly connected to the centering screw 652 via the centering nut 653. When the centering screw 652 rotates, the two push plates move inward or outward synchronously to adjust the position of the strip.

[0129] Belt tensioning device 64: The belt tensioning device 64 is installed on the lower side of the sliding frame 69 and is used to adjust the tension of the conveyor belt 63. This device includes a tensioning seat 641, two fixed rollers 642, and an adjusting roller 643. The tensioning seat 641 is a steel frame. The fixed rollers 642, with a diameter of Ø80mm, are rotatably mounted at both ends of the tensioning seat 641. The adjusting roller 643, with a diameter of Ø80mm, is located between the two fixed rollers 642 and is slidably connected to the tensioning seat 641 via a vertical groove. The adjusting roller 643 is threadedly connected to an adjusting bolt 644, which has a diameter of Ø20mm. Rotating the adjusting bolt 644 allows the adjusting roller 643 to move up and down approximately 50mm, thereby adjusting the tension of the conveyor belt 63.

[0130] The specific parameters of the unit in this mode are as follows:

[0131] Maximum rolling pressure: 5000KN

[0132] Rolling speed: 0~150m / min

[0133] Pressing method: Fully hydraulic pressing

[0134] Hydraulic cylinder diameter: φ420mm

[0135] Maximum opening: 20mm

[0136] Raw material thickness: 1-4mm

[0137] Finished product thickness: 0.1-2.0mm

[0138] Axial lateral movement distance of intermediate roller: 160mm

[0139] Cross-section of the frame archway: 420mm × 390mm

[0140] Main drive motor: 400KW

[0141] Rolling torque: 20 kN m.

[0142] 2. The operation procedure is as follows:

[0143] Roll changing preparation: A roll changing device 38 is used. The roll changing device 38 adopts a simple frame structure (a conventional structure, not described in detail), including a high roll changing frame 381 and a low roll changing frame 382, ​​and is equipped with a drive motor 383 (power 3KW, which, together with the screw device arranged in the roll changing frame, is used for pushing or pulling the roll). The upper intermediate roll 373 and lower intermediate roll 374, and the upper work roll 375 and lower work roll 376 are installed in pairs in the frame 34. During roll changing, the lower intermediate roll 374 and lower work roll 376, with pads supporting the upper work roll 375 and upper intermediate roll 373 respectively, are pushed out or pushed into the frame along the roll changing track. The upper intermediate roll 373 and lower intermediate roll 374 are installed first, followed by the upper work roll 375 and lower work roll 376.

[0144] When changing the intermediate roll, the high roll changing stand 381 is used alone, and the track on the stand is flush with the track of the lower intermediate roll inside the frame. When changing the work roll, the high roll changing stand 381 and the low roll changing stand 382 are combined and connected together, and the track on the stand is flush with the track of the lower work roll inside the frame.

[0145] Axial lateral movement adjustment of intermediate rolls: Axial adjustment of the intermediate rolls is achieved through four sets of axial lateral movement actuators 35 (corresponding to the upper intermediate roll 373 and the lower intermediate roll 374 respectively). Each device includes a hydraulic cylinder 351 (cylinder diameter Φ100mm, stroke 160mm, with built-in displacement sensor), a frame 352, a slider 353, and a locking pin 354. The slider 353 is locked to the connecting block 356 on the intermediate roll bearing seat by the locking pin 354. The hydraulic cylinder 351 drives the slider 353 to move laterally, with an adjustment range of 0-160mm, ensuring adaptability to strips of different widths.

[0146] In this embodiment, an intermediate roller is used as the drive roller. Therefore, the intermediate roller axial lateral movement pulling device 35 needs to avoid the drive shaft. By using four sets of intermediate roller axial lateral movement pulling devices 35, arranged in pairs on both sides of the bearing seats of the upper intermediate roller 373 and the lower intermediate roller 374, the drive shaft is avoided, and the lateral movement of the upper intermediate roller 373 and the lower intermediate roller 374 is realized. A displacement sensor is installed in the hydraulic cylinder 351, which can accurately control the distance of the intermediate roller axial lateral movement pulling. Furthermore, the hydraulic cylinder 351 adopts an inverted structure, which makes the maintenance of the hydraulic cylinder 351 simpler.

[0147] Specifically, a first pin hole 357 is provided on the connecting block 356, and a second pin hole corresponding to the first pin hole 357 is provided in the slider 353. The locking pin 354 passes through the first pin hole and the second pin hole to lock the bearing seat of the intermediate roller to the slider, thereby driving the axial lateral movement of the intermediate roller through the oil cylinder; and a sliding sleeve 355 is provided in the second pin hole to facilitate the insertion and removal of the locking pin 354.

[0148] Rolling line height adjustment: The rolling line height is adjusted using a rolling line adjustment device 39, which includes an encoder 391, a lead screw 392, a lifting platform 393, moving wedges 394, fixed wedges 395, a copper nut 396, and a hydraulic motor 397. The lifting platform is vertically slidably arranged in the frame and is used to house the bearing seat of the lower common support roller. The rolling line height is adjusted by adjusting the height of the lifting platform. The hydraulic motor 97 (working oil pressure 10MPa) drives the lead screw 392 to rotate, causing the two moving wedges 394 to move relative to or towards each other (wedge angle 11°, horizontal stroke 300mm), adjusting the height of the lifting platform 393, thereby precisely controlling the rolling line height.

[0149] Its working principle is as follows: Two fixed wedges are fixed to the bottom surface of the frame window, while two movable wedges each contain a copper nut, which is fixed to the movable wedge. The two copper nuts have left-hand and right-hand threads respectively. The lead screw has two thread sections, one left-hand and one right-hand, matching the corresponding copper nuts. The lead screw connects the two copper nuts and the two movable wedges together. The lead screw is driven by a hydraulic motor. When the lead screw rotates, the two movable wedges move relative to or towards each other along the lead screw axis. Under the action of the inclined plane of the movable wedges and fixed wedges, the height of the movable wedges and the lifting platform changes.

[0150] The relationship between the target height change and the number of screw rotations is calculated by adjusting the screw pitch and the angle of the inclined plane. The start and stop of the hydraulic motor are controlled by the encoder counting, thereby achieving closed-loop control of the rolling line height adjustment.

[0151] In another embodiment, the lifting platform 393 can be driven by other drive devices instead of the drive mechanism consisting of an encoder, lead screw, two moving wedges, two fixed wedges, two copper nuts and a hydraulic motor.

[0152] Pressing control: The pressing cylinder 36 (piston size Φ450×50mm, working hydraulic pressure 20MPa) is located on the top of the frame, and shares a common support roller 371 for pressing down and pressing up. The cylinder has built-in high-precision displacement sensor and pressure detection sensor, and controls the roll gap through an electro-hydraulic servo valve to ensure uniform strip thickness.

[0153] Specifically, it includes the following two test modes:

[0154] 2.1 Coil rolling mode:

[0155] The left platform device 2 and the right platform device 4 are positioned in their working positions using their respective hydraulic cylinders 210;

[0156] The steel coil is loaded onto the left coiler 1 using a trolley, and the coil head passes through the left platform device 2, the multi-functional rolling mill 3, and the right platform device 4 to enter the right coiler 5.

[0157] Set the roll gap according to the process requirements, press the strip steel, and use the left and right coilers to tighten the strip steel to establish tension;

[0158] Start the multi-functional rolling mill 3 to complete the reversible rolling process according to the procedure.

[0159] 2.2 Single-slab rolling mode:

[0160] The left platform device 2 and the right platform device 4 are moved away from their working positions and into standby positions by their respective hydraulic cylinders 210; and the left single-piece feeding device 6 and the right single-piece feeding device 7 are installed on the left and right sides of the multi-functional rolling mill.

[0161] Place a single steel plate on the conveyor belt 63 of the single-piece feeding device 6 on the left side;

[0162] Set the roll gap according to the process requirements, adjust the roll gap, start the unit, and the conveyor belt 63 feeds the steel plate into the roll gap for rolling.

[0163] After rolling, the steel plate enters the single-piece feeding device 7 on the right side and is then rolled back and forth according to the process.

[0164] Furthermore, the unit is also equipped with displacement sensors for detecting roll gap, pressure sensors for measuring rolling force, tension gauges for measuring tension, speed measuring instruments, etc., and has roll gap control mode, AGC control mode, and second flow rate control mode, and can measure and record data during the rolling process.

[0165] The working process of the single-piece feeding device is as follows:

[0166] The push-pull cylinder 67 extends and retracts, driving the sliding frame 69 to move along the fixed slide rail 61 to a working position close to the rolling mill.

[0167] The electric motor 621 drives the transmission roller 622 via a roller chain, which in turn starts the conveyor belt 63.

[0168] The operator places the strip on the conveyor belt 63, and the strip moves toward the mill inlet with the conveyor belt 63.

[0169] The centering device 65 is activated, and the centering hydraulic motor 651 drives the centering screw 652 to rotate. The right push plate 644 and the left push plate 655 move inward synchronously, adjusting the belt to the center of the conveyor belt 63.

[0170] When the strip reaches the pressing roller device 66, the roller 662 presses it onto the conveyor belt 63, and the centering baffle 664 prevents the strip from running off-center.

[0171] The elastic slide plate 611 supports the conveyor belt 63 and adapts to the thickness of the belt through the elastic action of the spring 6114, ensuring that the belt fits tightly with the conveyor belt 63.

[0172] The strip is then smoothly fed into the mill inlet for further processing.

[0173] 3. Technological Advantages

[0174] High-precision plate shape control: Multi-dimensional plate shape control is achieved through the synergistic action of the working roll and the intermediate roll, as well as the axial lateral movement adjustment of the intermediate roll.

[0175] Compact design: The intermediate roll / flattening roll and positive bending roll are fixedly installed, which reduces the width of the frame window and makes the equipment more compact.

[0176] Process flexibility: Small-diameter work rolls (Φ100mm) are suitable for high-precision cold rolling, meeting the production needs of thin strip steel.

[0177] Example 2

[0178] This embodiment demonstrates a specific application of a multi-functional rolling mill in a four-high rolling mill system, which is particularly suitable for strip leveling and surface quality improvement. The difference between this embodiment and Embodiment 1 is as follows:

[0179] 1. The equipment configuration is as follows:

[0180] 1.1. Configuration of Four-Roller Leveling Mode

[0181] The multi-functional rolling mill of this embodiment includes a stand 34 and a four-high rolling system. The four-high rolling system consists of the following components:

[0182] Leveling rolls: Upper leveling roll 377 and lower leveling roll 378, with specifications of Φ420×500mm, material of 9Cr2Mo, hardness of HS95±2, surface roughness of Ra0.4-0.8, bearing housing material of 35CrMo forged steel, and bearings using tapered roller bearings.

[0183] Shared support rollers: Upper shared support roller 371 and lower shared support roller 372, with specifications of Φ630×450mm, material of 70Cr3Mo, and hardness of HS75±2.

[0184] Transmission system: The upper leveling roller 377 and the lower leveling roller 378 serve as transmission rollers, and are connected to the gearbox 32 and the motor 31 via the transmission shaft 33.

[0185] Bending roller device: upper intermediate roller / flattening roller positive bending roller (with upper intermediate roller / flattening roller positive bending cylinder block 379, cylinder diameter Φ65mm, stroke 54mm) and lower intermediate roller / flattening roller positive bending roller (with lower intermediate roller / flattening roller positive bending cylinder block 3710, cylinder diameter Φ65mm, stroke 54mm), shared with the six-roller mode.

[0186] Pressing cylinder: The hydraulic automatic thickness control pressing cylinder is one of the most important core actuators in the automatic sheet and strip thickness control system. It controls the displacement and pressure of the hydraulic cylinder through an electro-hydraulic servo valve, causing the rolls to move up and down, thereby achieving precise control of the roll gap and ultimately precise control of the sheet thickness. Its characteristics include high response frequency, low friction, and high control accuracy. The pressing cylinder uses a built-in high-precision displacement sensor to detect the piston displacement, and is also equipped with a pressure sensor. The cylinder type is a piston cylinder, and the piston size (cylinder diameter)... Stroke): Φ450×50mm, Working hydraulic pressure: 20MPa;

[0187] 1.2 Configuration of Single-piece Feeding Device

[0188] The left-side single-piece feeding device 6 and the right-side single-piece feeding device 7 have the same structure and are used to feed single pieces of strip into the rolling mill for rolling or leveling. Taking the left-side single-piece feeding device 6 as an example, the structure of this embodiment is basically the same as that of Embodiment 1, with the difference being the following adjustments to details to adapt to different production needs.

[0189] Difference Description

[0190] The clamping roller device 66: In this embodiment, the clamping roller device 66 includes three or six rollers 662, each roller 662 having a diameter of Ø80mm and a length of 450mm, which increases the number of rollers compared to Embodiment 1. This design is suitable for conveying wider or heavier strips (e.g., wider than 600mm) to provide a more uniform clamping force.

[0191] Alignment device 65: The alignment hydraulic motor 651 is replaced with a more powerful model (5kW) to provide stronger driving force and adapt to the alignment requirements of strips with a width of up to 800mm or a greater weight.

[0192] Conveyor belt 63: The width of conveyor belt 63 is increased to 600mm to match the conveying requirements of wider plate belts, which requires an increase in the width of the sliding frame to 700mm.

[0193] The specific parameters of the unit in this mode are as follows:

[0194] Maximum rolling pressure: 5000KN

[0195] Rolling speed: 0~150m / min

[0196] Pressing method: Fully hydraulic pressing

[0197] Hydraulic cylinder diameter: φ420mm

[0198] Maximum opening: 20mm

[0199] Raw material thickness: 1-4mm

[0200] Finished product thickness: 0.1-2.0mm

[0201] Axial lateral movement distance of intermediate roller: 160mm

[0202] Cross-section of the frame archway: 420mm × 390mm

[0203] Main drive motor: 400KW

[0204] Rolling torque: 20 kN m.

[0205] 2. Operating Procedures

[0206] Roll changing preparation: Using the high roll changing platform 381 in the roll changing device 38, and in conjunction with the drive motor 383, the upper leveling roll 377 and the lower leveling roll 378 are installed in pairs into the frame 34. During roll changing, the lower leveling roll 378, with the upper leveling roll 377 supported by a pad, is pushed out or pushed into the frame along the roll changing track.

[0207] Rolling line height adjustment: Similar to Example 1, the height of the lifting platform 393 is adjusted using the rolling line adjustment device 39 to ensure that the leveling rolls are in correct contact with the strip.

[0208] Pressing control: The pressing cylinder 36 controls the pressure of the upper common support roller 371 through the electro-hydraulic servo valve, adjusts the roller gap, and ensures the flatness of the strip.

[0209] Bending roll adjustment: The bending degree of the leveling roll is adjusted by the intermediate roll / leveling roll positive bending roll device to optimize the strip shape and surface quality.

[0210] Specifically, it includes the following two test modes:

[0211] 2.1 Roll flattening mode:

[0212] The left and right platform devices are positioned in their respective working positions using their hydraulic cylinders 210.

[0213] The steel coil is loaded onto the left coiler 1 using a trolley, and the coil head passes through the left platform device 2, the multi-functional rolling mill 3, and the right platform device 4 to enter the right coiler 5.

[0214] Set the pressure according to the process requirements, tighten the strip steel, and use the left and right coilers to pull the strip steel to establish tension.

[0215] Start the multi-functional rolling mill 3 to perform single-pass leveling according to the process.

[0216] 2.2 Single-piece flattening mode:

[0217] The left platform device 2 and the right platform device 4 are moved away from their working positions and into standby positions by their respective hydraulic cylinders 210; and the left single-piece feeding device 6 and the right single-piece feeding device 7 are installed on the left and right sides of the multi-functional rolling mill.

[0218] Place a single steel plate on the conveyor belt 63 of the single-piece feeding device 6 on the left side;

[0219] After being leveled, the steel plate enters the single-piece feeding device 7 on the right side; leveling is generally done in only one pass. If secondary or multiple leveling is required, the above operation is repeated.

[0220] 3. Technological advantages

[0221] Excellent leveling effect: The large-diameter leveling roller (Φ420mm) enhances the leveling ability of the strip and improves the surface finish.

[0222] Component commonality: It shares the support roller and positive bending roller device with the six-roller mode, which reduces equipment costs.

[0223] Easy to operate: The benchtop roller changing device simplifies the leveling roller replacement process and adapts to various process requirements.

[0224] Through the two embodiments described above, the application of the multi-functional rolling mill in six-roll rolling mode and four-roll leveling mode has been fully demonstrated. In Embodiment 1, the six-roll mode achieves high-precision cold rolling through small-diameter work rolls and multi-method strip shape control; in Embodiment 2, the four-roll mode optimizes the surface quality of the strip using large-diameter leveling rolls. The equipment, through its dual-roll system design, shared components, and compact structure, balances flexibility and economy, reflecting the practicality and innovation of this application.

[0225] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multifunctional testing unit, characterized in that, It includes a left coiler, a left platform device, a multi-functional rolling mill, a right platform device, a right coiler, a left single-piece feeding device, and a right single-piece feeding device, and the multi-functional rolling mill can switch between a four-roll system and a six-roll system; When the multi-functional rolling mill is a six-roll system, the left coiler, the left platform device, the multi-functional rolling mill, the right platform device, and the right coiler are arranged sequentially along the rolling direction to form a coil rolling mill unit. When the multi-functional rolling mill is a four-roll system, the left single-piece feeding device, the multi-functional rolling mill, and the right single-piece feeding device are arranged sequentially along the rolling direction to form a single-piece rolling mill unit.

2. The multifunctional testing unit according to claim 1, characterized in that, The multi-functional rolling mill includes: frame; A four-roll system consists of a pair of leveling rolls and a pair of common support rolls. A six-roll system consists of a pair of work rolls, a pair of intermediate rolls, and a pair of common support rolls. A roll changing device is located on one side of the bottom of the frame to support the free switching between a four-roll system and a six-roll system within the frame; In the six-roll system, the sum of the diameters of the intermediate roll and the working roll is equal to the diameter of the leveling roll in the four-roll system. Furthermore, the bearing seats of the intermediate roll, the working roll, and the leveling roll are designed with equal width to enable free switching between the four-roll system and the six-roll system in the frame.

3. The multifunctional testing unit according to claim 2, characterized in that, The multi-functional rolling mill also includes: The working roll, a positive bending roll, is installed in the frame; The intermediate roll / leveling roll is a shared intermediate roll / leveling roll positive bending roll, and the opening width of the intermediate roll / leveling roll positive bending roll and the work roll positive bending roll are the same.

4. The multifunctional testing unit according to claim 3, characterized in that, The multi-functional rolling mill also includes: Four sets of intermediate roller axial lateral movement pulling devices are fixedly installed on one side of the frame, corresponding to the upper and lower intermediate rollers in pairs, respectively, so as to realize the axial movement of the intermediate rollers. The intermediate roller / flattening roller is fixedly installed in the frame to keep the intermediate roller / flattening roller stationary when the intermediate roller moves laterally, thereby reducing the width design size of the intermediate roller / flattening roller.

5. The multifunctional testing unit according to claim 4, characterized in that, The intermediate roller axial lateral movement pulling device includes a hydraulic cylinder, a frame, a slider, and a locking pin. The frame is fixedly installed on the machine frame. The hydraulic cylinder adopts an inverted structure and has a built-in displacement sensor. The slider is slidably installed in the frame and connected to the piston of the hydraulic cylinder to drive the slider to move laterally. Connecting blocks are provided on both sides of the bearing seat of the intermediate roller to connect the two intermediate roller axial lateral movement pulling devices respectively. A first pin hole is provided on the connecting block, and a second pin hole corresponding to the first pin hole is provided in the slider. The locking pin passes through the first pin hole and the second pin hole to lock the bearing seat of the intermediate roller to the slider, and then the intermediate roller is driven to move axially laterally by the oil cylinder.

6. The multifunctional testing unit according to claim 1, characterized in that, The left and right platform devices have the same structure, both including a mounting base, a platform sliding frame slidably arranged on the mounting base, and a hydraulic cylinder for driving the platform sliding frame to slide laterally, so as to switch the left and right platform devices between the working position and the standby position. The mounting base is provided with mounting holes for single-piece feeding devices, so that when the multi-functional rolling mill is a four-roll system, the left single-piece feeding device and the right single-piece feeding device can be installed on the mounting base respectively; The platform sliding frame is equipped with a swing guide plate for connecting the coiler and the multi-functional rolling mill, as well as a speed measuring roller, tension meter, and thickness gauge for detecting steel coil parameters.

7. The multifunctional testing unit according to claim 6, characterized in that, The left and right single-piece feeding devices have the same structure, both including: Fixed slide rails, which can be detachably installed on the mounting bases on both sides of the multi-functional rolling mill; The sliding frame is slidably mounted on the fixed slide rail; A conveyor belt, which is mounted around the sliding frame, transports the strip to the mill inlet. A pressing roller device is installed above the conveyor belt and arranged at one end of the conveyor belt near the mill; An elastic sliding plate is arranged below the pressing roller device and installed inside the sliding frame, forming a clamping space with the pressing roller device to clamp the conveyor belt; A fixed slide block is installed on the frame of a multi-functional rolling mill and is slidably connected to the sliding frame. The push-pull cylinder is connected to a fixed slide block and a sliding frame at both ends, respectively, to drive the sliding frame to move closer to or away from the rolling mill along the fixed slide rail.

8. The multifunctional testing unit according to claim 7, characterized in that, The pressing roller device includes roller seats mounted on a sliding frame and located on both sides of the conveyor belt, and a number of rollers rotatably connected between the roller seats to press the strip onto the conveyor belt.

9. The multifunctional testing unit according to claim 7, characterized in that, The elastic slide includes a slide and a fixed base arranged at the bottom of the slide and fixedly connected to the sliding frame. The fixed base is connected to the slide via a telescopic sleeve, and a spring is provided in the telescopic sleeve to accommodate slides of different thicknesses.

10. The multifunctional testing unit according to claim 7, characterized in that, It also includes a belt tensioning device, which includes a tensioning seat fixedly installed in the sliding frame and two fixed rollers rotatably installed between the tensioning seat and an adjustable roller that can be adjusted up and down. The adjustable roller is located between the two fixed rollers, and the conveyor belt located on the lower side of the sliding frame passes around the two fixed rollers and the adjustable roller in sequence. The tension of the conveyor belt is adjusted by raising and lowering the adjustable roller. The adjusting roller is vertically slidably arranged on the tensioning seat and threadedly connected to the adjusting bolt that is vertically engaged in the tensioning seat, so that the height of the adjusting roller can be adjusted by rotating the adjusting bolt.

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