A method and system for magnetic lifting of a steel sheet conveyor plate

Abstract

This invention discloses a method and system for magnetically lifting steel plates in a steel plate conveyor. The method includes the following steps: magnetically lifting the upper steel plate directly above stacked steel plates; using a pre-set magnetic force on a single plate base to attract the upper steel plate until it detaches from the lower steel plate; detecting the overall fit value of the edge distance between the two plates; determining whether it exceeds a preset threshold; if it does not exceed the threshold, the upper steel plate is lifted into the furnace; if it does exceed the threshold, the magnetic force coefficient for double-plate adsorption is matched; the upper steel plate is lowered and stacked with the lower steel plate, and the magnetic force is output according to the coefficient to complete the double-plate adsorption; then the double plates are lifted into the furnace. This invention achieves double-plate lifting, improving furnace utilization and processing efficiency, reducing energy consumption, eliminating interference from false double-plate fit, avoiding the risk of falling during lifting, matching magnetic force as needed to avoid excessive energy consumption, and balancing lifting safety and efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel plate processing technology, and in particular, to a method and system for magnetic lifting plates of a steel plate conveyor. Background Technology

[0002] In the field of high-strength steel heat treatment production, the tempering process is the core link to eliminate rolling stress in steel plates and ensure mechanical properties. Among them, the market demand for 3mm to 10mm thin-gauge high-strength steel is showing a continuous growth trend due to the increasing market demand for lightweight automobiles and lightweight construction machinery.

[0003] Currently, most high-strength steel heat treatment production lines in China adopt the traditional operation mode of single-plate hoisting and single-plate furnace loading. That is, the magnetic hoist can only pick up one thin steel plate at a time to complete the hoisting operation from the loading platform outside the furnace to the heating furnace. Due to the limitations of the tempering furnace length and the tempering time of thin steel plates, the tempering rhythm of thin steel plates is much faster than its hoisting rhythm, resulting in low production efficiency and energy waste for thin plates.

[0004] However, if double-plate hoisting is attempted, the two plates may become falsely attached due to gravity, causing the lower plate to fall when both plates are simultaneously adsorbed, posing a safety hazard. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a magnetic lifting plate method and system for a steel plate conveyor.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for magnetically lifting steel plates using a steel plate conveyor includes the following steps: S1, moving the magnetic lifter to directly above the stacked steel plates on the loading platform; S2, the magnetic lifter uses a pre-set magnetic force to attract the first steel plate and lifts it vertically by a first pre-set displacement, causing the lifted first steel plate to disengage from the second steel plate below; S3, detecting the distance between the lower edge of the first steel plate and the upper edge of the second steel plate to obtain the overall fit value of the first and second steel plates; S4, determining whether the overall fit value is greater than a preset threshold: if yes, proceed to step S5; if no, the magnetic lifter uses the pre-set magnetic force to attract the first steel plate and moves it from outside the furnace along a preset trajectory, lifting the first steel plate to the heating stage. S5. According to the preset matching strategy, obtain the magnetic force coefficient of the magnetic hanger that matches the overall fit value; S6. The magnetic hanger lowers the first steel plate so that it is stacked on the second steel plate, and determines the magnetic force output by the magnetic hanger according to the matched magnetic force coefficient of the double plate adsorption to complete the synchronous adsorption of the first and second steel plates; S7. The steel plate conveyor drives the magnetic hanger to move the stacked first and second steel plates from outside the furnace along a preset trajectory, and transports the first and second steel plates to the designated placement position of the steel plates in the heating furnace; S8. The magnetic hanger removes the magnetic force and returns to step S1 until the number of steel plates in the heating furnace reaches the preset number.

[0007] Further, step S7 specifically includes: S71, the magnetic crane moves the first steel plate and the second steel plate along the external track to the designated placement position of the steel plate in the heating furnace; S72, the magnetic crane lowers the first steel plate and the second steel plate until the distance between the second steel plate and the bearing surface below is less than a first preset distance, then the descent speed of the magnetic crane is reduced, and the lifting force of the magnetic crane is detected in real time. When the decrease in the lifting force is detected to reach a first preset value, the magnetic crane stops descending, and the magnetic force of the magnetic crane decreases to the preset magnetic force of the single plate foundation; S73, the magnetic crane attracts the first steel plate and lifts it to a second preset displacement in the vertical direction; S74, the magnetic crane attracts the first steel plate and descends, and the lifting force of the magnetic crane is detected in real time. When the decrease in the lifting force is detected to reach a first preset value, the magnetic crane stops descending, and the magnetic force of the magnetic crane decreases to zero.

[0008] Further, step S3 specifically includes: S31, with the first steel plate suspended and the second steel plate stationary, arranging along the edges of the first and second steel plates. S32: At each detection position, the actual separation distance between the lower edge of the first steel plate and the upper edge of the second steel plate at each detection position is obtained; S33: Based on the difference between the actual separation distance at each detection position and the first preset displacement, the overall fit value of the first steel plate and the second steel plate is calculated.

[0009] Further, step S31 specifically includes: S311, after the first steel plate has been suspended and stabilized for a predetermined period of time, acquiring side images of the edges of the first and second steel plates; S312, extracting the contour curve of the lower edge of the first steel plate and the contour curve of the upper edge of the second steel plate based on the side images; S313, selecting on the contour curve of the lower edge of the first steel plate... Detect location, obtain Lower detection point; S314, obtain the corresponding contour curve of the lower edge of the first steel plate. Detection location Upper detection point; S315, obtained The distance between the lower detection point and the corresponding upper detection point is used as the actual separation distance.

[0010] Furthermore, the overall fit value It is obtained by calculation using the following formula: ; ; For the first The difference between the actual separation distance at each detection position and the first preset displacement; For the first The actual separation distance at each detection location This is the first preset displacement; This is the maximum permissible deviation value.

[0011] Furthermore, in step S6, the magnetic force output by the magnetic sling... Confirmed using the following formula: ; Pre-set magnetism for the single-board foundation; The number of steel plates to be hoisted; is the magnetic force coefficient of the double-plate adsorption.

[0012] Further, in step S6, the magnetic gantry pulls the first steel plate down, so that the first steel plate is stacked on the second steel plate. Specifically, this includes: the magnetic gantry pulls the first steel plate down and the magnetic gantry pull force is detected in real time. When the detected decrease in the pull force reaches a first preset value, the magnetic gantry pull stops descending.

[0013] The present invention also provides a magnetic lifting plate system for a steel plate conveyor, for performing the magnetic lifting plate method for the steel plate conveyor described above.

[0014] The present invention has the following beneficial effects: By providing a double-plate hoisting operation path, the pace of feeding thin-gauge steel plates into the furnace can be accelerated, improving the mismatch between the tempering and hoisting rhythms in the traditional single-plate hoisting mode. This enhances the effective utilization rate of the heating furnace, increases processing efficiency, and reduces energy consumption caused by furnace idleness. By first hoisting the first steel plate to de-contact it with the second, the interference of false adhesion caused by gravity during natural stacking of the two plates can be eliminated. Then, by using adhesion detection to accurately determine the adhesion state of the two plates, the safety risk of the lower steel plate falling during double-plate hoisting due to false adhesion is fundamentally avoided. By matching the adhesion value with the corresponding magnetic force coefficient of the double plates, excessive energy consumption caused by blindly increasing the magnetic force in existing double-plate hoisting schemes is avoided. Furthermore, selecting the double-plate or single-plate hoisting mode based on the adhesion state ensures hoisting safety while maximizing hoisting efficiency under suitable conditions.

[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall process of the method of the present invention; Figure 2 This is a detailed flowchart of step S7 of the method of the present invention; Figure 3 This is a detailed flowchart of step S31 of the method of the present invention; Figure 4 This is a schematic diagram of a magnetic lifting structure. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0021] Please refer to Figure 1 The present invention provides a preferred embodiment of a magnetic lifting method for a steel plate conveyor, comprising steps S1, S2, S3, S4, S5, S6, S7 and S8.

[0022] S1. Move the magnetic crane directly above the stacked steel plates on the loading platform. Using the magnetic crane's sensors, position detection is achieved, ensuring the magnetic crane is precisely positioned directly above the stacked steel plates on the loading platform. This aligns the magnetic crane's adsorption area with the center of the steel plates, providing a positioning basis for subsequent adsorption operations.

[0023] S2, the magnetic lift uses the pre-set magnetic force of the single-plate foundation to attract the first steel plate and lifts it vertically by a first pre-set displacement, causing the lifted first steel plate to detach from the second steel plate below. First, the magnetic lift descends to bring it into contact with the first steel plate, then uses the pre-set magnetic force of the single-plate foundation to attract the first steel plate, causing it to move. The pre-set magnetic force of the single-plate foundation refers to the magnetic force value capable of stably attracting a single steel plate of the target thickness. The first pre-set displacement is a vertical distance sufficient to completely separate the first steel plate from the second steel plate, thereby eliminating the false adhesion caused by the weight of the two plates when they are naturally stacked. False bonding refers to a situation where, when steel plates are naturally stacked, the upper plate appears to be tightly bonded due to its own weight, and the lower plate is also affected by its own weight and the pressure from the upper plate. However, due to warping deformation caused by production or storage, there are still tiny gaps between the plates that have not been completely eliminated, and elastic stress generated by deformation exists. This condition can interfere with the bonding test of the double plates, easily leading to a misjudgment of a good bonding result. This can result in a safety hazard of the lower plate falling during the lifting of the double plates. Step S2 restores the double plates to their natural warped state, eliminating the interference of false bonding on subsequent bonding tests and avoiding the safety hazard of the lower plate falling during the lifting of the double plates due to false bonding.

[0024] S3, detect the distance between the lower edge of the first steel plate and the upper edge of the second steel plate to obtain the overall fit value of the first and second steel plates. By capturing side images of the edges of the two plates using industrial area array cameras positioned on the sides of the steel plates, extracting the edge contours, and then uniformly selecting multiple detection positions along the steel plate edges, the actual separation distance at each position is calculated, and the overall fit value is calculated using a formula. This quantifies the true fit state of the two plates, providing objective data support for the selection of subsequent lifting modes, replacing the traditional experience-based judgment method, and improving the accuracy of the judgment. It can be understood that the first steel plate is the topmost steel plate stacked on the loading platform, and the second steel plate is the adjacent steel plate below the topmost steel plate. When the steel plates enter the heating furnace, the first and second steel plates are updated, becoming the top two steel plates among the remaining stacked steel plates on the loading platform.

[0025] S4, determine if the overall fit value is greater than a preset threshold: if yes, proceed to step S5; if no, the magnetic hoist uses the preset magnetic force of the single-plate foundation to attract the first steel plate and move it from outside the furnace along a preset trajectory, transporting the first steel plate to the designated placement position inside the heating furnace. A fit value higher than the threshold indicates good double-plate fit, suitable for double-plate hoisting; a value lower than the threshold indicates severe double-plate warping, posing a risk of falling during double-plate hoisting, and the system switches to single-plate hoisting mode. This achieves intelligent switching of hoisting modes, maximizing production efficiency while ensuring hoisting safety, and avoiding the safety hazards caused by forced double-plate hoisting.

[0026] S5. Based on a preset matching strategy, obtain the magnetic force coefficient of the double-plate adsorption of the magnetic hanger, which matches the overall fit value. The matching strategy is that the higher the fit, the lower the magnetic force coefficient of the double-plate adsorption, reducing magnetic waste while ensuring adsorption safety. Dynamically matching magnetic parameters avoids energy waste caused by blindly increasing the magnetic force, while ensuring the stability of double-plate adsorption and balancing energy efficiency and lifting safety.

[0027] S6, the magnetic crane lowers the first steel plate so that it is stacked on the second steel plate. The magnetic force output by the magnetic crane is determined according to the matching magnetic force coefficient of the two plates to complete the synchronous adsorption of the first and second steel plates.

[0028] S7, the steel plate conveyor drives the magnetic crane to move the stacked first and second steel plates from outside the furnace along a preset track, transporting the first and second steel plates to the designated placement positions inside the heating furnace. The magnetic crane then deactivates its magnetic force, placing the two plates in the designated positions inside the furnace, and then returns to the loading platform to repeat the lifting process until the number of steel plates in the heating furnace reaches a preset value (e.g., the heating furnace can hold 20 steel plates).

[0029] S8, the magnetic force is removed from the crane, returning to step S1, until the number of steel plates in the heating furnace reaches the preset quantity. This achieves automated cyclic hoisting, improves the automation level of the production line, reduces manual intervention, and continuously improves the production efficiency of thin-gauge steel plates.

[0030] This invention provides a magnetic lifting method for a steel plate conveyor. By offering a double-plate lifting operation path, it accelerates the furnace loading of thin-gauge steel plates, improves the mismatch between the tempering and lifting rhythms in the traditional single-plate lifting mode, enhances the effective utilization rate of the heating furnace, increases processing efficiency, and reduces energy consumption caused by furnace idleness. By first lifting the first steel plate to de-contact it with the second plate, the interference of false adhesion caused by gravity when the two plates are naturally stacked is eliminated. Then, the adhesion degree is detected to accurately determine the adhesion state of the two plates, fundamentally avoiding the safety risk of the lower steel plate falling during double-plate lifting due to false adhesion. By matching the adhesion degree value with the corresponding magnetic force coefficient of the two plates, excessive energy consumption caused by blindly increasing the magnetic force in existing double-plate lifting schemes is avoided. Furthermore, selecting the double-plate or single-plate lifting mode based on the adhesion degree ensures lifting safety while maximizing lifting efficiency under suitable conditions.

[0031] like Figure 4 As shown, the magnetic hoist includes a lifting plate 100 and multiple magnetic lifting platforms 110 installed below the lifting plate 100. Tension sensors can be installed on the connection structure (such as connecting steel cables) between the lifting plate 100 and the lifting platforms 110. The sum of the values ​​detected by the tension sensors on all the platforms 110 reflects the lifting force of the entire magnetic hoist. The track system includes a transverse track 200, on which a transverse trolley 300 is mounted for transverse movement. The transverse trolley 300 moves via a driving mechanism, such as a motor driving rollers on the trolley to rotate, or a winch pulling the trolley via steel cables. A vertical track 400 is installed on the transverse trolley 300 for lifting the lifting plate 100. Lifting the lifting plate can be achieved by a winch, hydraulic cylinder, or other mechanisms that drive the lifting of the lifting plate 100.

[0032] Reference Figure 2 In some embodiments of the present invention, step S7 specifically includes steps S71, S72, S73, and S74.

[0033] S71, the magnetic hoist pulls the first and second steel plates along the external track to their designated placement positions within the heating furnace. The magnetic hoist, via the transport machine's track system, moves along the pre-planned external track, precisely positioning itself directly above the designated placement positions within the heating furnace, ensuring that the placement of the two plates conforms to the furnace's heating layout requirements.

[0034] S72, the magnetic crane lowers the first and second steel plates until the distance between the second steel plate and the supporting surface below is less than a first preset value. Then, the descent speed of the magnetic crane is reduced, and the lifting force of the magnetic crane is monitored in real time. When the decrease in lifting force reaches the first preset value, the magnetic crane stops descending, and the magnetic force decreases to the preset magnetic force of the single plate foundation. Initially, it descends at a normal speed. When the second steel plate approaches the supporting surface inside the furnace, it slows down. The change in lifting force is used to determine whether the second steel plate is in contact with the supporting surface. When the decrease in lifting force reaches the first preset value, it indicates that sufficient contact has been made, and the descent stops. The magnetic force is then adjusted to only be able to attract a single steel plate, ensuring that only the upper steel plate is attracted. This avoids damage caused by the steel plate colliding with the supporting surface during rapid descent and prepares for subsequent separation of the two plates, preventing them from being unable to separate due to excessive magnetic force. If a steel plate is already placed at the designated location, the bearing surface is the upper surface of the topmost steel plate already placed at the designated location. If no steel plate has been placed at the designated location, the bearing surface is the steel plate support surface of the corresponding steel plate placement structure (such as a placement rack) at the designated location. For example, the magnetic crane initially descends at a speed of 50 mm / s. When the distance between the second steel plate and the bearing surface inside the furnace is 15 mm (the first preset distance), the descent speed is reduced to 2 mm / s. Simultaneously, the tension sensor monitors the lifting force in real time. When the cumulative decrease in lifting force reaches the first preset value, it indicates that the second steel plate has contacted the bearing surface, and the descent stops. Typically, the first preset value is less than the weight of a single steel plate. For example, if the weight of the steel plate is 800 N, the first preset value is set to 700 N. When the lifting force decreases by 700 N, it indicates that the second steel plate has contacted the bearing surface, and most of the weight has been borne by the bearing surface. At this point, the descent stops, and the magnetic force is adjusted to the preset magnetic force for a single plate (e.g., 900 N). Releasing the second steel plate at this point will not cause a significant descent and collision. It can be understood that during the lifting force detection, the weight of the relevant structure of the magnetic crane is first subtracted, using this as a zero baseline. That is, when there is no steel plate on the magnetic crane, the lifting force is 0.

[0035] S73, the magnetic lift attracts the first steel plate and lifts it vertically by a second preset displacement; this causes the upper steel plate to rise, completely separating the two plates and preventing them from being in a bonded state. This prevents oxidation and adhesion caused by the plates being pressed together during heating, improves the surface quality of the steel plates after heat treatment, and reduces peeling damage during subsequent unloading. For example, the magnetic lift vertically lifts the first steel plate at a speed of 2mm / s, with a lifting distance of 20mm (the second preset displacement), completely separating the first and second steel plates and preventing them from sticking together during heating.

[0036] S74: The magnetic crane attracts and lowers the first steel plate, while continuously monitoring the lifting force. When the decrease in lifting force reaches a preset value, the magnetic crane stops descending, and its magnetic force drops to zero. The upper steel plate is then lowered, and changes in lifting force are used to determine if the upper and lower steel plates are in sufficient contact. Once sufficient contact is achieved, descent stops, and the magnetic force is deactivated, completing the placement of the upper steel plate. For example, if the magnetic crane lowers the first steel plate at a speed of 2 mm / s, and the lifting force is monitored in real time, when the lifting force decreases from 800 N to 100 N, it indicates that the first steel plate has contacted the bearing surface. Descending then stops, and the magnetic force is deactivated, preventing significant descent and collision of the first steel plate, and avoiding further descent by the magnetic crane that could crush the steel plate.

[0037] In some embodiments of the present invention, step S3 specifically includes steps S31 and S32.

[0038] S31, with the first steel plate suspended and the second steel plate stationary, arranged along the edges of the first and second steel plates. Multiple detection points are set along the edges of the steel plates to obtain the actual separation distance between the lower edge of the first steel plate and the upper edge of the second steel plate at each detection location. With one plate suspended and the other stationary, multiple detection points are set to obtain the edge distance of the two plates at each location, covering multiple areas of the steel plate edges. This comprehensive detection of the bonding state of the two plates avoids errors caused by local detection and improves the comprehensiveness and accuracy of bonding judgment.

[0039] S32, based on the difference between the actual separation distance at each detection position and the first preset displacement, the overall fit value of the first and second steel plates is calculated. The difference between the actual distance at each detection point and the preset separation displacement is calculated, and these differences are integrated into a value representing the overall fit state of the two plates using a unified algorithm. The fit state of the two plates is quantified into a unified numerical index, providing an objective quantitative basis for the subsequent selection of the hoisting mode.

[0040] Reference Figure 3 In a further embodiment of the present invention, step S31 specifically includes steps S311, S312, S313, S314 and S315.

[0041] S311: After the first steel plate has been suspended and stabilized for a predetermined time, acquire side images of the edges of the first and second steel plates. After the suspended steel plates have fully stabilized, capture side images of the edges of both plates to avoid image blurring caused by plate swaying. This improves the clarity of the captured images, providing accurate basic data for subsequent contour extraction and spacing detection. Multiple image sensors can typically be placed around the steel plate to acquire images and data from multiple edges. For example, after the first steel plate is suspended, wait 3 seconds (a predetermined time) for it to stabilize, then continuously capture 3 frames of side images using an industrial camera positioned on the side of the steel plate, selecting the clearest frame as the detection image. The image sensors (cameras) can be fixed around the loading platform or around the magnetic crane, both enabling image acquisition of the steel plates being attracted to the loading platform.

[0042] S312, based on the side image, extract the contour curves of the lower edge of the first steel plate and the upper edge of the second steel plate. Image processing algorithms are used to eliminate noise and reflection interference in the image, extracting clear contour curves of the double plate edges. Accurately obtaining the edge position information of the double plates provides a reliable foundation for subsequent spacing detection. After grayscale conversion and Gaussian noise reduction processing of the detection image, the Canny edge detection algorithm is used to extract the contour curves of the lower edge of the first steel plate and the upper edge of the second steel plate, eliminating the interference of image noise on contour extraction.

[0043] S313, select on the contour curve of the lower edge of the first steel plate Detect location, obtain Multiple detection points are evenly selected on the contour curve of the lower edge of the upper plate, covering different positions on the edge of the upper plate. This ensures the representativeness of the detection points and avoids the influence of local detection deviations on the overall judgment.

[0044] S314, obtain the contour curve corresponding to the lower edge of the first steel plate. Detection location There are two upper detection points; on the contour curve of the lower edge of the plate, find a point whose horizontal position matches that of the lower detection point, and use it as the corresponding upper detection point. Ensure that the horizontal positions of the upper and lower detection points correspond one-to-one to guarantee the accuracy of the spacing detection.

[0045] S315, obtained The distance between the lower detection point and the corresponding upper detection point is used as the actual separation distance. The coordinate spacing in the image is converted into the actual physical spacing to match the actual size requirements of the production scenario. This yields accurate data on the edge spacing of the two boards, providing precise parameters for fitting calculations.

[0046] In a specific embodiment of the present invention, the overall fit value It is obtained by calculation using the following formula: ; ; For the first The difference between the actual separation distance at each detection position and the first preset displacement; For the first The actual separation distance at each detection location Set the first preset displacement, for example, to 20mm; The maximum permissible deviation value can be set to 10mm. By considering the number of detection points and the maximum permissible deviation value, the spacing deviation of all detection points is integrated into a fit value between 0 and 1. The closer the value is to 1, the better the bonding between the two boards. For example, in another embodiment... , mm, , This indicates that the two boards fit together very well, making them suitable for double-board hoisting.

[0047] In a specific embodiment of the present invention, in step S6, the magnetic force output by the magnetic levitation device... Confirmed using the following formula: ; Pre-set magnetism for the single-board foundation; The number of steel plates to be hoisted; This refers to the magnetic force coefficient for dual-plate adsorption. Based on the matching magnetic force coefficient, the number of steel plates to be lifted, and the basic magnetic force of each plate, the appropriate dual-plate adsorption magnetic force is calculated. The magnetic force output is dynamically matched to reduce energy waste while ensuring lifting safety, avoiding energy loss caused by excessive magnetic force, and simultaneously avoiding lifting risks caused by insufficient magnetic force.

[0048] In some embodiments, It can be obtained according to the following preset matching strategy: , Take 1.3; , Take 1.5; , Set the value to 1.8. The preset threshold is 0.3; when it is less than 0.3, no setting is required. The value is switched to single-board hoisting mode.

[0049] In a specific embodiment of the present invention, step S6 involves a magnetic chuck lowering the first steel plate so that it is stacked on top of the second steel plate. Specifically, this includes: the magnetic chuck adsorbing and lowering the first steel plate, while simultaneously monitoring the lifting force of the magnetic chuck in real time. When the detected decrease in lifting force reaches a first preset value, the magnetic chuck stops lowering. The change in lifting force determines whether the first and second steel plates are in sufficient contact. Lowering stops once sufficient contact is achieved, precisely controlling the double-plate bonding process to prevent damage from collisions during descent and ensuring complete bonding of the two plates, thus providing a stable foundation for subsequent double-plate adsorption.

[0050] This invention also provides a magnetic lifting system for a steel plate conveyor, used to execute the magnetic lifting method for a steel plate conveyor. This system integrates a magnetic lift, a steel plate conveyor, a vision inspection module, a tension sensor, and a control system. The control system coordinates the automatic execution of the lifting method by each module. This achieves automated operation of thin-gauge steel plate lifting, reduces manual intervention, minimizes human error, and improves the automation level and overall production efficiency of the production line.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for magnetically lifting a steel plate conveyor, characterized in that, Includes the following steps: S1, move the magnetic crane to directly above the stacked steel plates on the loading platform; S2, the magnetic crane uses a single-plate foundation to magnetically attract the first steel plate and lifts it vertically by a first preset displacement, so that the lifted first steel plate is no longer in contact with the second steel plate below; S3, detect the distance between the lower edge of the first steel plate and the upper edge of the second steel plate to obtain the overall fit value of the first steel plate and the second steel plate; S4, Determine if the overall fit value is greater than the preset threshold: If so, proceed to step S5; If not, the magnetic crane uses the pre-set magnetic attraction of the single-plate foundation to move the first steel plate from outside the furnace along a pre-set track, and transports the first steel plate to the designated placement position of the steel plate inside the heating furnace; S5, according to the preset matching strategy, obtain the magnetic force coefficient of the double plate adsorption of the magnetic hanger that matches the overall fit value; S6, the magnetic crane lowers the first steel plate so that it is stacked on the second steel plate. The magnetic force output by the magnetic crane is determined according to the matching magnetic force coefficient of the two plates to complete the synchronous adsorption of the first and second steel plates. S7, the steel plate conveyor drives the magnetic hoist to move the stacked first and second steel plates from outside the furnace along a preset track, and transport the first and second steel plates to the designated placement position of the steel plates inside the heating furnace; S8, the magnetic force is eliminated by the magnetic hanger, and the process returns to step S1 until the number of steel plates in the heating furnace reaches the preset number.

2. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, Step S7 specifically includes: S71, the magnetic hoist drives the first steel plate and the second steel plate to move along the external track to the designated placement position of the steel plate in the heating furnace; S72, the magnetic crane lowers the first steel plate and the second steel plate until the distance between the second steel plate and the bearing surface below is less than the first preset distance. Then, the magnetic crane reduces its descent speed and monitors the lifting force of the magnetic crane in real time. When the detected decrease in lifting force reaches the first preset value, the magnetic crane stops descending and the magnetic force of the magnetic crane decreases to the preset magnetic force of the single plate foundation. S73, the magnetic crane attracts the first steel plate and lifts it to the second preset displacement in the vertical direction; S74, the magnetic crane attracts the first steel plate and descends, while the lifting force of the magnetic crane is detected in real time. When the detected decrease in lifting force reaches the first preset value, the magnetic crane stops descending and the magnetic force of the magnetic crane decreases to zero.

3. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, Step S3 specifically includes: S31, with the first steel plate suspended and the second steel plate stationary, arranged along the edges of the first and second steel plates. The actual separation distance between the lower edge of the first steel plate and the upper edge of the second steel plate at each detection position is obtained. S32, based on the difference between the actual separation distance at each detection position and the first preset displacement, calculate the overall fit value of the first steel plate and the second steel plate.

4. The magnetic lifting method for a steel plate conveyor according to claim 3, characterized in that, Step S31 specifically includes: S311, after the first steel plate has been suspended and stabilized for a predetermined period of time, acquire side images of the edges of the first steel plate and the second steel plate; S312, Based on the side image, extract the contour curve of the lower edge of the first steel plate and the contour curve of the upper edge of the second steel plate; S313, select on the contour curve of the lower edge of the first steel plate Detect location, obtain Next detection point; S314, obtain the contour curve corresponding to the lower edge of the first steel plate. Detection location Up to the testing point; S315, obtained The distance between the lower detection point and the corresponding upper detection point is used as the actual separation distance.

5. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, The overall fit value It is obtained by calculation using the following formula: ； ； For the first The difference between the actual separation distance at each detection position and the first preset displacement; For the first The actual separation distance at each detection location This is the first preset displacement; This is the maximum permissible deviation value.

6. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, In step S6, the magnetic force output by the magnetic sling... Confirmed using the following formula: ； Pre-set magnetism for the single-board foundation; The number of steel plates to be hoisted; is the magnetic force coefficient of the double-plate adsorption.

7. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, In step S6, the magnetic jack lowers the first steel plate, causing it to be stacked on top of the second steel plate. Specifically, this includes: The magnetic crane attracts the first steel plate and descends, while the lifting force of the magnetic crane is monitored in real time. When the detected decrease in lifting force reaches the first preset value, the magnetic crane stops descending.

8. The magnetic lifting method for a steel plate conveyor according to claim 7, characterized in that, The first preset value is less than the weight of a single steel plate.

9. The magnetic lifting method for a steel plate conveyor according to claim 1, characterized in that, It can be obtained according to the following preset matching strategy: , Take 1.3; , Take 1.5; , Take 1.

8.

10. A magnetic lifting system for a steel plate conveyor, characterized in that, Used to perform the magnetic lifting method for a steel plate conveyor as described in any one of claims 1 to 9.

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