336 results about "Load distribution" patented technology

The invention relates to a stress analysis method and system based on a small and medium span bridge steel-concrete composite structure, and belongs to the technical field of stress analysis, and the method comprises the following steps: S1, building a finite element parameterized model of a steel-concrete composite bridge; s2, constructing a slippage effect model of a steel-concrete interface based on the constitutive relationship of the steel-concrete composite bridge; s3, applying a moving load working condition, and dividing a load position of the steel-concrete composite bridge through a dynamic grid; s4, solving and correcting the structural stress of the steel-concrete composite bridge; s5, key section stress distribution of the steel-concrete composite bridge is output so as to identify the maximum tension and compression stress area; the method has the beneficial effects that the dynamic change of the load action can be accurately reflected in the model so as to reflect the stress state of the bridge under the actual traffic load; and an accurate structural stress solution is gradually approximated, and a reliable stress analysis result is obtained by comprehensively considering material characteristics, structural geometrical shapes and load distribution factors.

According to the method for designing the reasonable arch axis of the large-span arch bridge based on the hybrid calculation algorithm and the self-adaptive load distribution, an analytic equation method, a curve fitting method and an intelligent optimization algorithm are combined, and by selecting the initial arch axis, introducing a dynamic load distribution model and applying a genetic algorithm and a particle swarm optimization algorithm, the reasonable arch axis of the large-span arch bridge is designed. Global and local optimization is carried out, and the optimal shape and load distribution of the arch axis are ensured. And finally outputting design parameters, such as a control point, a bending moment, thrust and the like. According to the method, the design precision, flexibility and safety can be effectively improved, the material utilization rate is optimized, the cost is reduced, and the method is particularly suitable for design of large-span bridges and has high practical value.

The invention discloses an arc-shaped curved surface ribbed beam spherical roof construction optimization method based on spatial data, and relates to the technical field of building construction. According to the method, a multi-dimensional data acquisition and preprocessing system covering coordinates, loads and temperatures is constructed, a support, template and steel bar three-dimensional model is constructed based on a standardized data set, and dynamic regulation and control of template curved surface precision are realized in combination with curved surface modeling and a CPDI deviation index algorithm, so that the method is adaptive to the hyperboloid form of the cross arc ribbed beam, and the construction efficiency is improved. The load distribution uniformity of a supporting system is analyzed in real time, real-time linkage of data and a three-dimensional model is achieved by means of a digital twin platform, the construction parameter adjustment response time is effectively shortened, the formwork reworking and frame body reinforcing cost is reduced, and the node load standard deviation is greatly reduced through dynamic optimization of the vertical rod density and the inclined strut angle; in cooperation with temperature data closed-loop regulation and control, concrete inside and outside temperature difference over-limit cracking is avoided, early warning and management and control of risks in the whole construction process are achieved, and it is guaranteed that the geometric shape of the roof meets the design requirement.

A grill grate device is provided. The device is comprised of a base, at least one fastener for removably attaching the base to a bottom grill grate, and at least one vertical attachment post extending upward from the base. The vertical post may be fixed or telescopic and includes at least one rotation point with a locking mechanism, allowing for angular and height adjustments. The lower end of the post may include a curved or angled bottom edge to provide a cantilever effect that enhances load distribution across the base. The upper grill grate attaches to the vertical post via reciprocal attachment points enabling secure yet detachable installation. The upper grill grate is suspended above the main grate and may be rotated laterally around the attachment point for repositioning.

The invention discloses a building construction monitoring method and system based on FEA and BIM, and relates to the technical field of building construction monitoring, and the method comprises the steps: building a construction disturbance behavior model, achieving the time sequence modeling of a construction process and the generation of a dynamic excitation function, inputting the time sequence modeling and dynamic excitation function into a finite element simulation model, and obtaining the structural response index of each stage; a risk distribution diagram is generated in combination with the BIM, monitoring points are divided, an intelligent sensor network is further arranged to collect structural data, control suggestions are output through trend recognition and a feedback function and are visualized in the BIM, and dynamic closed-loop control of construction monitoring is achieved. The construction disturbance tolerance difference is combined, and the system can output feedback suggestion strength, guide the construction rhythm and load distribution adjustment, so that construction closed-loop control based on risk perception is realized, and the intelligent level and the risk pre-judgment capability of the construction monitoring system are improved.

This disclosure provides a configurable pallet or load-bearing platform, such as a pallet, for supporting goods. The load-bearing platform may include one or more plastic bases having two or more protrusions connected by one or more bridge pieces. The two or more protrusions are spaced apart one or more distances. The load-bearing platform further includes a cardboard base having openings spaced apart an amount wherein the openings are configured to receive the two or more protrusions of the plastic base. A load distribution member may be included and configured to contact at least a portion of the plastic base. The load distribution member may support at least a portion of the goods and distributes at least a portion of the weight of the goods to at least a portion of the plastic base. The size of the cardboard base, as well as other components of the load-bearing platform, in certain implementations, may be customized on demand.

The invention relates to the technical field of bridge construction, in particular to a hybrid beam cable-stayed bridge side span concrete main beam cast-in-place support and a dismantling construction method thereof, and the cast-in-place support comprises a side main beam supporting frame, a top plate supporting frame and a distribution structure; the distribution structure comprises a plurality of bearing main beams and a plurality of distribution beams; the plurality of sand cylinders are used for supporting the bearing main beam; the bailey beams are arranged between the bearing main beams and the distribution beams at intervals; the distribution beams support the side girder pouring formwork and the top plate supporting frame, and the top plate supporting frame supports the top plate pouring formwork. Through a multi-stage load distribution structure of the bearing main beam, the distribution beams and the sand cylinders, load distribution of supporting points is optimized, the overall stability of the support is improved, the bailey beams effectively disperse loads through a stress mechanism of trusses of the bailey beams, a rigid connection system is formed by the bailey beams and the bearing main beam, and the overall section flexural rigidity of a bearing component is improved; the method can ensure that the supporting system keeps a stable geometrical shape in the construction process.

The invention provides a surrounding rock pressure calculation method for a multi-arch tunnel without a middle pilot tunnel, belongs to the technical field of highway tunnel engineering, solves the problem that an existing calculation method cannot express actual stress characteristics of the multi-arch tunnel without a middle wall, and comprises the following steps: establishing a surrounding rock pressure load distribution model of the multi-arch tunnel without the middle pilot tunnel; respectively calculating basic loose pressures qf and qr according to the established distribution model; adding loose pressure qz; adding loose pressure qa, qaf, qar and qz; and the lateral horizontal pressure ef, er, ewf and ewr. According to the method, the distribution and the size of the surrounding rock pressure acting on the lining structure of the buried-depth multi-arch tunnel without the middle pilot tunnel are determined, the stress of the lining structure is analyzed, structural checking calculation is carried out, and necessary theoretical support is provided for evaluating and optimizing the structure.

The invention belongs to the technical field of cranes, and discloses a stable feeding device for building construction, the stable feeding device comprises a crane body, the bottom end of the crane body is provided with a vehicle bottom groove, the two sides of the top end of the vehicle bottom groove are both provided with first supporting parts, and the first supporting parts are each provided with a second supporting part; deep anchor points are formed through the conical head and the ground pressure plate, first-level anchoring is formed, deflection-free downward moving positioning can be carried out for different stratums, high-strength supporting operation is achieved, the multiple sets of supporting shaft columns are adaptive to concave-convex ground through the abutting plate, multiple supporting points are expanded, second-level assistance is achieved, the number of the supporting points is increased, and the supporting area is expanded. A more stable mechanical structure is formed, lateral torque and sudden load impact can be effectively resisted, the probability of occurrence of overturning accidents is reduced, the stable state of the crane body during hoisting and feeding of building materials is guaranteed, the supporting shaft column is in linkage with the hollow ring through the supporting shaft rod, the field angle is automatically adjusted along with the anchoring depth, and load distribution is optimized.

The invention relates to the technical field of coal mining, and discloses an overlying strata multi-key layer composite pressure relief method and device, electronic equipment and a storage medium. Comprising the following steps: acquiring multi-mode rock stratum information of each overlying rock stratum of a target mining area; key strata in all the overlying strata are judged through the multi-mode strata information of all the overlying strata; based on the lithology and the mechanical property of each key layer, determining a pressure relief mode of each key layer; and determining pressure relief parameters of each key layer based on the pressure relief mode of each key layer. According to the method, the load distribution of each rock stratum is quantitatively calculated to judge the bearing capacity of each overlying rock stratum so as to preliminarily screen the key layer candidate layer, the fracture distance of the key layer candidate layer is further calculated to judge the fracture critical condition of each key layer candidate layer, and finally the key layer is screened out, so that the reliability of a key layer judgment result can be improved, and the judgment accuracy of the key layer is improved. It is ensured that the determined key layer is the optimal pressure relief layer position, and the economic benefit and efficiency of pressure relief construction can be improved.

The invention provides a pile foundation load transfer simulation method and system combined with machine learning, and the method comprises the steps: firstly constructing an interaction scene model which comprises a pile foundation construction element, a soil body layer element and an external load element, and generating a load transfer process fragment set under different load conditions; then, a pre-trained load transmission dynamic evolution model is called to conduct inversion learning on the fragment set, a load transmission path and a pile-soil interface state evolution characteristic sequence are generated, dynamic deduction is conducted according to the load transmission path and the pile-soil interface state evolution characteristic sequence, and dynamic characteristics of pile foundation load distribution and pile body displacement are obtained; and finally, a simulation analysis report containing a load transfer dynamic process curve is generated based on the dynamic characteristics, so that the accuracy and reliability of pile foundation load transfer simulation are improved.

The invention discloses a complex soft foundation waterscape miniature steel pipe pile reinforcing method which comprises the following steps: accurately predicting a deformation value of a potential settlement area by fusing thickness distribution parameters, soil compression modulus and numerical simulation, and comparing the deformation value with an engineering safety threshold. When deformation exceeds the standard, an optimization algorithm is adopted to adjust pile foundation arrangement, optimized pile foundation position parameters are generated, then connection node coordinates are extracted from the bottom plate structure model, and stress transmission efficiency and load distribution uniformity are calculated. And if the uniformity is lower than a threshold value, a reinforcement configuration scheme is finally generated by iteratively updating a connection node stiffness matrix, optimizing connection mechanism parameters, extracting mechanical transmission path data, simulating long-term stability and evaluating the durability improvement degree. According to the method, multi-level parameter optimization and numerical simulation are combined, so that the foundation stability and the load distribution uniformity are ensured, and the engineering durability and safety are remarkably improved.

The invention relates to a high-rise building roof cantilever structure formwork supporting system and a construction method thereof, and belongs to the technical field of building construction. In order to solve the problems that a traditional overhanging formwork needs to penetrate through a wall to retain a hole, leakage is prone to occurring, and dismantling is tedious, root high-strength bolt-end plate connection is adopted, an 18 # I-shaped steel main beam is not arranged on an overhanging section, and the 18 # I-shaped steel main beam and a 12 # I-shaped steel inclined strut form a self-balancing triangular stress unit; a disc buckle type cantilever outer frame is installed at the outer end of the same main beam, a steel pipe formwork is erected at the inner end of the same main beam, load distribution is optimized through finite elements, and the maximum hogging moment is reduced by more than or equal to 20% compared with a traditional scheme. Continuous concrete pouring of the cantilever structure can be achieved through one-time building of the system, holes do not need to be reserved in an outer wall, the whole cantilever structure can be hoisted away only by loosening bolts and cutting off inclined strut weld joints during dismantling, and materials can be turned over by 100%. The method obviously eliminates the hidden danger of leakage, shortens the construction period, reduces the cost, and is suitable for construction of various cantilever structures such as cantilever slabs, cantilever beams and aerial corridors.

The invention provides a construction method for load decomposition and transmission of a special-shaped beam curved template, and belongs to the technical field of building construction.The load change of each node of the curved template is monitored in real time by establishing a load jump identification matrix, and a supporting system abutting stability matrix is constructed to evaluate the bearing capacity of each abutting point; a graph theory shortest path algorithm is utilized to optimize a load transmission path and form a fluctuation evaluation vector, a prestressed reinforcement tension stability control matrix is constructed to realize symmetrical batch tension, and support system parameters and a tension program are adjusted in real time through a load transmission dynamic balance equation set. And a load transmission effect evaluation vector is established to perform continuity and controllability evaluation on an overall transmission path, and when the transmission efficiency is lower than a set value, the load distribution and path optimization program is executed again, so that the technical problem of instability of a support system caused by uncontrollability of the load transmission path in the construction process of the special-shaped beam curved template is solved.

The invention relates to the technical field of steel pile engineering simulation analysis, and discloses a steel pile oil cylinder stress and steel pile gravity center change model simulation analysis method, which comprises the following steps: acquiring oil cylinder pressure, steel pile displacement track data and geological parameters, and cleaning; extracting multi-dimensional features to generate dynamic load distribution parameters, and constructing a coupling relation model; the oil cylinder pressure and the steel pile displacement dynamic state are jointly verified, the space correspondence between the pressure gradient change and the gravity center shift is recognized, and the abnormal correlation is quantified; generating a system stability index, and judging whether to trigger control parameter correction; if correction is needed, a pressure compensation scheme is automatically generated. According to the method, through multi-dimensional data processing, coupling modeling and dynamic verification, precise analysis and intelligent control over oil cylinder stress and gravity center change in steel pile operation are achieved, the system stability and construction safety are improved, and the method is suitable for steel pile construction scenes such as ocean engineering.

The invention relates to the technical field of tunnel engineering construction, in particular to a stress verification method for a tunnel secondary lining trolley portal and a related product, and the method comprises the following steps: determining a vertical load; determining a lateral load; independent load values borne by each vertical supporting device and each lateral supporting device are calculated; the calculated independent load values are compared with the respective rated bearing capacity of the supporting devices, and whether the structural strength of the portal meets the safety requirement or not is judged; according to the method, a load distribution model closer to engineering practice and a more comprehensive double-strength checking mechanism are provided, so that the accuracy of structural strength evaluation can be improved, safety accidents caused by insufficient local bearing capacity are effectively prevented, and technical guarantee is provided for tunnel construction safety.

The invention discloses a cylindrical roller modification method based on a non-uniform rational B-spline curve, and relates to the technical field of bearing design. According to the method, a bearing contact mechanical model considering the roller modification effect is constructed, a modification contour is constructed based on a non-uniform rational B-spline curve (NURBS curve), an optimization model with the basic reference rated life of a bearing as a target function is established on the basis of meeting geometric constraint conditions, and an optimization algorithm is adopted for solving to obtain a final modification curve. The established contact mechanical model comprises a bearing static balance model and a roller-raceway contact mechanical model and is used for calculating load distribution and contact stress under the unbalance loading working condition. Compared with a traditional symmetrical logarithmic modification method, the problem that the axial stress of the roller is not uniform under unbalance loading can be effectively solved, the uniformity of contact stress distribution is improved, and the fatigue life of the bearing is prolonged.

The application discloses a kind of vehicle load management and control method and system for bridge group cascade deduction application, method includes: completing bridge section division and arranging data acquisition equipment;The correlation of different bridge sections is calculated, and the bridge sections with correlation exceeding the set threshold are automatically classified into the same linkage section;According to the chain length of vehicle load data traceable, different bridge sections are divided into grades;And based on the correlation of bridge section, load matching is completed for the bridge section without direct load monitoring data by adjacent bridge load migration method;Based on the physical cascade order of bridge section and the correlation of bridge section, short-time traffic volume prediction is completed;Then deduce the load distribution change of downstream bridge;Further complete the normalization of bridge load and extract the worst load distribution in deduction prediction period;Bridge load state grade evaluation is completed and the corresponding management and control scheme is triggered.To provide guarantee for safe and efficient operation of bridge group.

The invention relates to the technical field of mechanical supporting structures, in particular to a high-rigidity double-guide-rod follow-up supporting structure which comprises a guide rod body, a double-shaft linkage mechanism, a self-adaptive elastic supporting assembly, a sensor network and a central processing unit. The rigidity is enhanced through a composite material core body and high-frequency quenching, synchronous displacement is achieved through double-shaft linkage, load distribution is optimized through elastic supporting, the manufacturing process is simplified through modular design, and the running state is monitored in real time through a sensor network. The rigidity, the bearing capacity and the synchronization precision of the guide rod can be remarkably improved, meanwhile, intelligent monitoring and alarming are achieved, and the guide rod is suitable for the field of high-precision mechanical equipment.

The invention provides a test device and a test method for whole-process fixed-proportion multi-axis loading, and belongs to the technical field of structural engineering tests, and the test device comprises a counter-force frame, an actuator and a load distribution mechanism; the load distribution mechanism adopts a rigid distribution body with a first stage and a second stage connected in series, and each distribution body is provided with a load input point and two load output points; the actuator is hinged with an input point of the primary rigid distribution body, and the output of the actuator is respectively transmitted to the secondary rigid distribution body and a plurality of loading points of a test piece to be tested through the first to fourth connecting rod groups, so that the load input by the single actuator is distributed to different positions of the test piece according to a set proportion. According to the invention, the load proportion of the multi-axis rod system node test piece in the whole process of elasticity, plasticity and damage can be stably maintained, so that a load-deformation whole-process curve and a failure mode under the action of a fixed-proportion multi-axis load can be completely obtained, and a reliable test means is provided for researching the bearing performance of the multi-axis rod system node.

This invention discloses a rail steel transport device, including a fixed ring and a transport vehicle. A connecting ring is movably installed at the top of the fixed ring, and the connecting ring is connected to the transport vehicle through a connector. A telescopic rod is provided on the fixed ring, which is used to achieve docking assembly between adjacent fixed rings. The telescopic rod is equipped with a first screw for locking the telescopic stroke. Movable arms are hinged to both sides of the fixed ring, and clamping arms are hinged to the lower ends of the movable arms. The clamping arms are hinged to each other in pairs, so that the hinge points of the movable arms and clamping arms form a rhomboid structure. The clamping arms are designed with an L-shaped structure. The fixed ring, movable arms, and clamping arms cooperate to form a single clamping structure. This invention uses a double-clamping structure at both ends of the rail steel, combined with a telescopic rod to form an integrated limiting frame. During lifting operations, both ends of the rail are simultaneously stressed, improving the problem of steel body tilting and dragging wear caused by uneven load distribution in traditional single-point fixing.

The application discloses a kind of multi-layer position underlying roadway surrounding rock zoning difference control methods under dynamic pressure influence, by constructing working face mining floor stress distribution mechanics model, the load distribution of mining stress concentration zone and stress recovery zone is calculated;The stress state of different positions of mining floor surrounding rock is calculated, and the floor surrounding rock is zoned accordingly, and according to the floor surrounding rock zoning result, the underlying roadway of different positions is correspondingly zoned and divided, to obtain high dynamic pressure roadway, medium dynamic pressure roadway and low dynamic pressure roadway;And different technical measures are used for high dynamic pressure roadway, medium dynamic pressure roadway and low dynamic pressure roadway respectively to control the stability of roadway surrounding rock;Finally, the surrounding rock condition of underlying roadway under different dynamic pressure influence is monitored in real time, and the surrounding rock control measures are dynamically optimized according to the monitoring result.The application is aimed at multi-layer position underlying large roadway under dynamic pressure influence, and through "deep-shallow-surface" multiple surrounding rock control measures, the stability of surrounding rock in each region is effectively controlled.

The utility model discloses an overhanging structure for a bay window of a building, which belongs to the technical field of bay window overhanging, comprises a bay window component, and is characterized in that an upper hanging component and a lower supporting component are arranged, so that the bay window component can be hung on the bay window; the mode that a traditional cantilever structure purely depends on a cantilever beam or plate to extend outwards from a building body to support a bay window is changed, bay window load distribution is more uniform, too large bending moment is prevented from being generated at the cantilever root, the large section size and the reinforcement quantity needed by the position for resisting the bending moment are reduced, the material cost and the structure self weight are reduced to a certain degree, and the construction efficiency is improved. Meanwhile, by means of the up-and-down cooperative supporting and hanging mode, better performance can be achieved in the aspect of resisting upsetting moment caused by lateral force generated by strong wind or earthquakes, the structural stability is enhanced, and compared with traditional cantilever structure construction, the structure does not need to be like a traditional cantilever structure.

The utility model relates to the technical field of gasket detection, especially gasket detection device, including control cabinet, still including the material receiving box, the right side of control cabinet is provided with the feeding assembly, the top of control cabinet is provided with conveying assembly, the top of control cabinet is fixed with mounting seat, the top of mounting seat is installed with visual inspection module, the outside of visual inspection module is provided with shading assembly, the left side of the top of control cabinet is provided with mounting frame, the inside rotation of mounting frame is connected with the lead screw, the front end of mounting frame is fixed with drive motor, the output of drive motor is connected with the lead screw, and drive motor is used for driving the rotation of lead screw, the utility model discloses a lead screw drive structure is used to drive the front and back buffering of material receiving box, can even spread out the gasket of internal accumulation, significantly improve the uniformity of load distribution, avoid the uneven stress problem caused by local accumulation, the design effectively reduces the overflow risk of gasket in the process of transportation or vibration.

The present invention relates to a method for improving the wavy shape defects of the head of cold-rolled thin-gauge strip steel, comprising the steps of setting the roller shifting value according to the flatness, adjusting the frame load, and the like. The method for improving the wavy shape defects of the head of cold-rolled thin-gauge strip steel provided by the present invention is based on the existing plate shape control means of cold-rolled UCM equipment. By analyzing the influence of the intermediate roller shifting setting of the finished product frame on the plate shape control, a method for setting the intermediate roller shifting of the finished product frame for the wavy shape of the strip head is designed, as well as a method for resetting the load distribution if the plate shape control ability of the intermediate roller shifting is insufficient. Utilizing the method of the present invention, effective improvement measures can be implemented for the plate shape defects of the head of thin-gauge strip steel that plague production through manual intervention methods, which not only shortens the length of the thin-gauge strip steel with serious plate shape problems that needs to be sheared before entering the subsequent continuous annealing process, thereby improving the yield rate, but also improving the stability of rolling.

The invention discloses a combined structure of a height difference concrete beam and a steel pipe concrete column ring beam and a construction method.The combined structure comprises a circular steel pipe concrete column, an integrally-machined ring beam and a variable-height-difference concrete frame beam, the circular steel pipe concrete column comprises a circular steel pipe and self-compacting concrete, and the circular steel pipe is filled with the self-compacting concrete; two reinforcing outer ring plates which are vertically distributed at intervals are fixedly welded to the outer periphery of the circular steel pipe, the ring beam is fixedly connected with the reinforcing outer ring plates, and one end of the concrete frame beam is fixedly connected with the ring beam. According to the combined structure, the height or thickness of the component can be flexibly adjusted according to actual loads and topographic conditions, and the combined structure adapts to various complex working conditions; the stress state of the component can be optimized by changing the height or thickness, and the overall performance of the structure is improved; the component size can be reduced at the part with smaller stress, and the material and the construction cost are saved; complex load distribution and topographic conditions can be effectively adapted, and the bearing capacity and the anti-seismic property of the structure are improved.

The invention discloses foundation-free movable mixing station equipment with a horizontal tank bin, and relates to the field of foundation-free mixing stations, the foundation-free movable mixing station equipment comprises a base plate and a first horizontal tank arranged in the center of the top of the base plate, one end of the base plate is provided with an assistant supply device, and the other end of the base plate is provided with a stirring device; a plurality of storage devices are symmetrically arranged on the base plate with the first horizontal tank as the axis, a feeding conveying belt is arranged on one side of the top of the base plate, and a material uploading component is arranged on the other side of the top of the base plate. The system further comprises a load allocation device. According to the equipment, the problem of uneven load distribution of the base plate caused by material transfer in the production process of the movable mixing station is effectively solved, so that the weighing precision and the stirring stability of the equipment are remarkably improved.

The invention relates to a load distribution element (10) comprising a base plate (12) and fixing points (14) projecting from it, in particular at right angles, wherein the base plate (12) has a slot (22) between the fixing points (14) for guiding a fastening strap (28). The load distribution element (10) is designed to be attached to a transport container wall (26.1) at the level of a cut in a predetermined operating position by pressing the fixing points (14) into it, so that in the operating position the fastening strap (28) can be led out of the transport container (26) from an interior (32) of the transport container (26) through the cut in the transport container wall (26.1) and through the slot (22) in the base plate (12).

This invention discloses a process for producing 65Mn steel through continuous casting and rolling of thin slabs, belonging to the field of steel production. The method includes the following steps: steelmaking, casting and rolling, and slow cooling. The steel composition is controlled as follows: C: 0.62%-0.70%, Si: 0.17%-0.37%, Mn: 0.90%-1.20%, P≤0.035%, S≤0.030%, Cr≤0.20%, Ni≤0.30%, Cu≤0.25%, with the balance being Fe and impurities. In the continuous casting process, the slab thickness is 90mm-110mm, the casting speed is controlled at 4.0m / min-4.8m / min, and the temperature difference of the slab cross-section is controlled at 40℃-65℃. In the finishing rolling process, the F3 work roll uses high-speed steel rolls, and the F4 and F5 work rolls use high-nickel-chromium rolls. The crown of the F3 work roll is set to be 200µm larger than that of other steel grades, and the load distribution of each stand follows a decreasing principle. Compared with existing technologies, this method improves the yield rate of straight hair curls.