Automatic plate blanking system and blanking method

Abstract

The invention relates to an automatic plate discharging system and method, and belongs to the technical field of plate machining. The system comprises a raw material area, a feeding area, a code printing area, a cutting area, a cache area and a sorting area, plate transfer is achieved through a conveying roller way, an intelligent travelling crane and a connection trolley, a shot blasting machine, a cutting machine, a sanding machine and a sorting robot with a visual recognition function are arranged, and pretreatment, cutting, sanding and sorting of plates are achieved. The method comprises the steps of incoming material storage, shot blasting treatment, transferring and coding, cutting, sorting and sanding, leveling and storage and tray returning. The small-piece concentrated sorting area is independently arranged on a traditional sorting area production line, batches with more small-piece plates are transported to small-piece concentrated sorting, the production takt is increased, the production efficiency is improved, the system is further provided with a central control system to achieve total scheduling, cutting and sanding equipment is distributed according to the thickness and size of the plates, and the production efficiency is improved. And less manpower, continuity and automation of plate blanking are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of plate processing, and relates to an automatic plate unloading system and a unloading method. Background Art

[0002] In the modern industrial production system, sheet metal processing is undoubtedly a core link. The efficiency and accuracy of its cutting process are crucial to ensure the smooth operation of the entire production line and improve the quality of the final product. However, for a long time, the traditional sheet metal cutting method, especially those single-machine cutting modes that rely on manual operation, not only requires workers to bear high-intensity labor, but also has low efficiency, which is difficult to meet the urgent needs of modern industrial production for large-scale, high-quality output. The defect of this model is that it occupies a large area and the transfer distance of the sheet metal between various links is long, which seriously restricts the improvement of production efficiency. At the same time, due to the low material utilization rate, it also leads to unnecessary waste of resources.

[0003] With the continuous advancement of science and technology and the popularization of the concept of intelligent manufacturing, sheet metal cutting technology has also begun to undergo a profound change. A variety of new sheet metal cutting methods have emerged on the market, which have improved the cutting efficiency to a certain extent. However, they still have many limitations. For example, the lack of automation is a prominent problem, which makes it difficult to fundamentally improve production efficiency, and the labor intensity of workers is still high. In addition, low equipment utilization is also a major problem, which also causes a waste of resources. What's more tricky is that after the sheet metal is cut, the proportion of small sheets in the entire batch of sheets is often high, and sorting and sanding these small sheets takes a lot of time, which seriously drags down the rhythm of the entire production line and affects production efficiency.

[0004] Therefore, it has become a top priority to develop a highly automated and intelligent sheet metal cutting system. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an automatic material unloading system and method, so as to realize the unloading of plates of different thicknesses in a less-manned, continuous and automated manner, classify and process plates of different thicknesses and sizes, and improve the production rhythm of the production line.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A plate automatic unloading system comprises a raw material area, a loading area, a coding area, a cutting area, a buffer area and a sorting area which are arranged in sequence; the raw material area is connected with the loading area through a conveying roller, and an intelligent driving vehicle for transfer is arranged above the loading area, the coding area, the cutting area and the buffer area; a shot blasting machine is arranged on the conveying roller to perform shot blasting pretreatment on the plate, the conveying roller cooperates with the intelligent driving vehicle, and the plate pretreated on the conveying roller is transferred to the loading area by the intelligent driving vehicle; a first shuttle vehicle is also arranged between the loading area and the coding area, and a second shuttle vehicle is arranged between the buffer area and the sorting area; the sorting area comprises a small piece sorting area and a large piece sorting area which are arranged in sequence, and also comprises a small piece concentrated sorting area which is arranged side by side with the small piece sorting area and is connected with the large piece sorting area through a belt conveyor line.

[0008] Optionally, a cutting machine is provided in the cutting area, and a slag plate chain is provided directly below the cutting machine. The slag plate chain wraps around two driving sprockets in a ring shape. The rotation of the driving sprockets drives the slag plate chain to perform belt drive movement. A slag cleaning trolley for slag collection is provided at the lower front end of the slag plate chain in the running direction.

[0009] Optionally, a small piece material frame is provided between the small piece sorting area and the small piece centralized sorting area for storing small pieces of plate materials; the large piece sorting area includes a large piece sorting station, a waste material processing station, a pallet lifting station, and a second stacking area which are arranged in sequence; a large piece material frame for storing large pieces of plate materials is provided in the second stacking area.

[0010] Optionally, the loading area includes a pallet area and a first palletizing area which are arranged in sequence.

[0011] Optionally, the sorting area is provided with several sanding machines, including a first sanding machine arranged on the belt conveyor, and a second sanding machine arranged on one side of the large-piece sorting area; the sorting area is also provided with a sorting robot with a 3D visual recognition system and a sorting manipulator to identify the thickness of the plate and sort the plate according to the thickness of the plate to the corresponding first sanding machine or second sanding machine.

[0012] A method for automatically unloading plates, using the above-mentioned automatic unloading system for plates, comprises the following steps:

[0013] S1, after the incoming materials, the plates are unloaded and stored in the raw material area;

[0014] S2, transporting the plates in the raw material area to the shot blasting machine on the conveyor roller for shot blasting;

[0015] S3, the intelligent crane transports the plate to the loading area, and then transports it to the coding area for coding by the first shuttle vehicle;

[0016] S4, transporting the printed board to the cutting area for cutting;

[0017] S5, the cut plates are transported to the sorting area by the second shuttle vehicle, and sorted and sanded according to size;

[0018] S6, the plates after sanding are leveled and transported to the small parts frame or the second stacking area according to their sizes; the remaining waste frames in the pallet are transported out;

[0019] S7, the empty pallet is transported from the pallet lifting station to the second shuttle vehicle, and then returned to the pallet area of ​​the loading area by the second shuttle vehicle;

[0020] In step S5, when the plates with a single side length of less than 900 mm account for more than 90% of the total number of plates in the batch, they are transported to the small piece centralized sorting area for centralized sorting; when the plates with a single side length of less than 900 mm account for 90% or less than 90% of the total number of plates in the batch, they are first transported to the small piece sorting area to sort out the small pieces, and then transported to the large piece sorting area to sort out the large pieces.

[0021] Optionally, in step S4, the cutting machine includes a plasma cutting machine and a laser cutting machine; when the thickness of the plate is greater than 16 mm, the plate is assigned to the plasma cutting machine for cutting; when the thickness of the plate is less than or equal to 16 mm, the plate is assigned to the laser cutting machine for cutting; the slag generated during the cutting process falls onto the slag receiving plate chain, and the slag is transmitted to the edge along the slag receiving plate chain and then falls into the slag cleaning trolley, and the slag cleaning trolley is transported out after being fully loaded.

[0022] Optionally, the above-mentioned automatic plate unloading system also includes a central control system electrically connected to each area to realize overall scheduling of each link of the unloading system; in step S5, the sorting robot is arranged at the belt conveyor line, and after identifying the thickness of the plate, the data is transmitted to the central control system, and the central control system selectively issues an instruction to turn on or off the sanding machine according to the received plate thickness information, and the truss manipulator of the sorting robot simultaneously transfers the cut plate to the sanding machine; when it is identified that the plate thickness is greater than 16mm, the sanding machine is turned on to grind the cutting slag of the plate, and if the plate thickness is ≤16mm, the sanding machine is turned off to allow the plate to pass through the sanding machine empty.

[0023] Optionally, in step S3, the plates transferred to the loading area by the intelligent driving are preferentially transferred to the empty pallets in the pallet area. When there are no empty pallets in the pallet area, the transferred plates are placed in the first stacking area for temporary storage. After the plates in the pallet area are transported to the coding area, the plates temporarily stored in the first stacking area are transferred to the pallet area. The shuttle vehicle transports the pallets carrying the plates from the pallet area to the coding area for coding.

[0024] Optionally, in steps S6 to S7, the sorting robot walks in the small-piece material frame and the second palletizing area, and visually identifies the size of the plates. The sorting robot grabs plates of the same size and places them in the same pallet to achieve plate classification. Plates that cannot be palletized in time are transported to the outside of the second palletizing area via a conveyor chain for manual processing.

[0025] The beneficial effects of the present invention are:

[0026] The unloading system and method of the present invention can realize the unloading of plates of different thicknesses in a less-manned, continuous and automated manner, and can realize automatic shot blasting pretreatment, loading, coding, cutting and transportation of plates. Moreover, through a sorting robot with 3D visual effects, the thickness of the plates can be automatically identified, and sanding and cutting slag treatment, automatic leveling, sorting and classified stacking can be performed, thereby reducing labor costs and improving production efficiency and equipment utilization.

[0027] The present invention adopts a rolling slag receiving plate chain to directly receive and transport the slag dropped during the cutting process, and cooperates with the RGV slag receiving trolley to realize automatic cleaning and automatic transportation of the slag, thus solving the problem of slag cleaning. By separately setting up a small piece centralized sorting area in the sorting area, the problem of too many small pieces of the cut plates affecting the production rhythm of the entire production line is solved, thus improving the sorting efficiency of the production line. Two different cutting machines are set up for centralized mixed arrangement, and the plates are assigned to different cutting machines for cutting according to their different sizes, thus improving production flexibility and saving floor space.

[0028] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 It is a schematic plan view of the automatic plate unloading system of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the AA section;

[0032] Figure 3 for Figure 1 Schematic diagram of the middle BB section;

[0033] Figure 4 for Figure 1 Schematic diagram of the middle CC section;

[0034] Figure 5 for Figure 2 A-direction view of the center slag plate chain;

[0035] Figure 6 for Figure 5 Schematic cross-section of the center slag plate chain.

[0036] Reference numerals:

[0037] 1 Raw material area, 2 Loading area, 21 Pallet area, 22 First palletizing area, 3 Coding area, 4 Cutting area, 41 Cutting machine, 42 Slag receiving plate chain, 43 Driving sprocket, 44 Slag cleaning trolley, 5 Buffer area, 6 Sorting area, 61 Small piece sorting area, 62 Small piece centralized sorting area, 621 Small piece material frame, 622 Belt conveyor line, 623 First sanding machine, 63 Large piece sorting area, 631 Large piece sorting station, 6311 Mechanical sorting station, 6312 Manual sorting station, 632 Waste handling station, 633 Pallet lifting station, 634 Second palletizing area, 635 Large piece material frame, 636 Second sanding machine, 64 Sorting robot, 65 Transverse conveyor chain, 7 Conveyor roller, 71 Shot blasting machine, 8 Intelligent driving, 9 First shuttle bus, 10 Second shuttle bus. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0039] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0040] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] See also Figure 1 to Figure 6 , which is an automatic unloading system for plates, comprising a raw material area 1, a loading area 2, a coding area 3, a cutting area 4, a buffer area 5, and a sorting area 6 which are arranged in sequence; the raw material area 1 is connected with the loading area 2 through a conveying roller 7, and an intelligent driving vehicle 8 for transfer is arranged above the loading area 2, the coding area 3, the cutting area 4, and the buffer area 5; a shot blasting machine 71 is arranged on the conveying roller 7 to pre-treat the plates by shot blasting, and the conveying roller 7 cooperates with the intelligent driving vehicle 8, and the plates pre-treated on the conveying roller 7 are transported to the loading area 2 by the intelligent driving vehicle 8; a first shuttle vehicle 9 is also arranged between the loading area 2 and the coding area 3, and a second shuttle vehicle 10 is arranged between the buffer area 5 and the sorting area 6; the sorting area 6 comprises a small piece sorting area 61 and a large piece sorting area 63 which are arranged in sequence, and also comprises a small piece concentrated sorting area 62 which is arranged side by side with the small piece sorting area 61 and is connected with the large piece sorting area 63 through a belt conveyor line 622. Among them, small pieces of plate are plates with a single side length of less than 900mm, and large pieces of plate are plates with a single side length of 900mm.

[0042] The loading area 2 includes a pallet area 21 and a first palletizing area 22 which are arranged in sequence.

[0043] The cutting area 4 is provided with a cutting machine 41, and a slag plate chain 42 is provided directly below the cutting machine 41. The slag plate chain 42 wraps around two driving sprockets 43 in a ring shape. The rotation of the driving sprockets 43 drives the slag plate chain 42 to perform belt transmission movement. A slag cleaning trolley 44 for slag collection is provided at the lower front end of the slag plate chain 42 in the running direction.

[0044] A small piece material frame 621 is provided between the small piece sorting area 61 and the small piece centralized sorting area 62 for storing small pieces of plate materials; the large piece sorting area 63 includes a large piece sorting station 631, a waste material processing station 632, a tray lifting station 633, and a second stacking area 634 arranged in sequence; a large piece material frame 635 for storing large pieces of plate materials is provided in the second stacking area 634. The large piece sorting station 631 includes a mechanical sorting station 6311 and a manual sorting station 6312. When there are too many large pieces of plate materials and there is no time for mechanical sorting, manual sorting can be used to improve sorting efficiency.

[0045] The sorting area 6 is provided with several sanding machines, including a first sanding machine 623 arranged on the belt conveyor, and a second sanding machine 636 arranged on one side of the large-piece sorting area 63; the sorting area 6 is also provided with a sorting robot 64 with a 3D visual recognition system and a sorting manipulator to identify the thickness of the plate and sort the plate to the corresponding first sanding machine 623 or the second sanding machine 636 according to the thickness of the plate.

[0046] A method for automatically unloading plates, using the above-mentioned automatic unloading system for plates, comprises the following steps:

[0047] S1, after the incoming materials, the plates are unloaded and stored in the raw material area 1;

[0048] S2, transporting the plates in the raw material area 1 to the shot blasting machine 71 on the conveyor roller 7 for shot blasting pretreatment;

[0049] S3, the intelligent driving vehicle 8 transfers the plate to the loading area 2, and then transports it to the coding area 3 for coding by the first shuttle vehicle 9;

[0050] The pre-treated plates on the conveyor roller 7 are transported to the intelligent crane 8, and then the plates are transferred to the pallet area 21 or the first stacking area 22 of the loading area 2 by lifting, lifting and translation by the intelligent crane 8; they are preferentially transferred to the empty pallets in the pallet area 21, and when there are no empty pallets in the pallet area 21, the transferred plates are placed in the first stacking area 22 for temporary storage; after the plates in the pallet area 21 are transported to the coding area 3, the plates temporarily stored in the first stacking area 22 are transported to the pallet area 21; the shuttle bus transports the pallets carrying the plates from the pallet area 21 to the coding area 3 for coding; the coding information includes the material, size, manufacturer and production date of the plates.

[0051] In some embodiments of the present invention, the transfer cycle of a single sheet is 3 minutes per sheet, and the total line cycle is 4 minutes per sheet (the average time interval between the unloading operations of two consecutive identical sheets is 4 minutes). The remaining time is concentrated on transferring the sheets to the first stacking area 22, which can realize unmanned night shifts on the production line. The coding area 3 is equipped with 3 coding stations, and the beam-type inkjet printer automatically sprays the sheets according to the layout information of the sheets.

[0052] S4, transporting the printed sheet to cutting area 4 for cutting;

[0053] The cutting machine 41 includes a plasma cutting machine 41 and a laser cutting machine 41; when the thickness of the plate is greater than 16 mm, the plate is assigned to the plasma cutting machine 41 for cutting; when the thickness of the plate is less than or equal to 16 mm, the plate is assigned to the laser cutting machine 41 for cutting; the slag generated during the cutting process falls to the slag plate chain 42, and the slag is transmitted to the edge along the slag plate chain 42 and then falls into the waste box of the slag cleaning trolley 44. When the waste box is full, the RGV slag cleaning trolley 44 transfers the slag to the waste treatment auxiliary room outside the factory building to realize the automation of cleaning the slag. The cut plates are transferred to the buffer area 5 by the pallet.

[0054] The buffer area 5 is a multi-layer storage grid, and a lifting mechanism is provided in the buffer area 5 , through which the cut plates together with the tray are stored in the buffer area 5 .

[0055] S5, the cut plates are transported to the sorting area 6 by the second shuttle vehicle 10, and are sorted and sanded according to size;

[0056] When the plates with a single side length of less than 900 mm account for more than 90% of the total number of plates in the batch, the plates are transported to the small-piece centralized sorting area 62 for centralized sorting via the roller conveyor line + transverse conveyor; when the plates with a single side length of less than 900 mm account for 90% or less of the total number of plates in the batch, they are first transported to the small-piece sorting area 61 to sort out the small plates, and then transported to the large-piece sorting area 63 to sort out the large plates.

[0057] The above-mentioned automatic plate unloading system also includes a central control system electrically connected to each area to realize overall scheduling of each link of the unloading system; in step S5, the sorting robot 64 is set at the belt conveyor line 622, and after identifying the thickness of the plate, the data is transmitted to the central control system. The central control system selectively issues an instruction to turn on or off the sanding machine according to the received plate thickness information. The truss manipulator of the sorting robot 64 simultaneously transfers the cut plate to the sanding machine; when it is identified that the plate thickness is greater than 16mm, the sanding machine is turned on to grind the cutting slag of the plate. If the plate thickness is ≤16mm, the sanding machine is turned off to allow the plate to pass through the sanding machine empty.

[0058] S6, the plate after sanding is leveled and transported to the small piece material frame 621 or the second stacking area 634 according to the size; the waste frame left in the pallet is transported to the waste processing area, and after manual cutting of the waste, it is transported to the waste frame, and then temporarily stored in the AGV waste temporary storage area;

[0059] Through the steel plate size information and data analysis issued by the central control system, the leveling machine automatically adjusts the gap between the upper and lower leveling rollers according to the plate thickness to meet the leveling of plates of different thicknesses and materials. The sorting robot 64 walks in the small piece material frame 621 and the second stacking area 634. The leveled plates are sorted by the sorting robot 64 to the small piece material frame 621 or the second stacking area 634. The plate size is visually identified, and the sorting robot grabs the plates of the same size and places them in the same pallet. One pallet can stack multiple plates at the same time to achieve plate classification; when the plates are too late to be stacked, they are stacked on the conveyor plate chain by the truss robot, and then transported to the outside of the automatic sorting line by the plate chain for manual processing. When the single-side size of the plate is 900mm~2500mm, a truss robot is used for sorting. When the single-side size of the plate is greater than 2500mm, two truss robots are synchronously grabbed to lift the large pieces to the large-piece leveling conveyor line.

[0060] After sorting, the pallet carrying the waste frame is transported to the waste treatment area via a roller conveyor. The waste is cut manually and transported to the waste frame by a crane, and then transported to the waste temporary storage area by an AGV automatic guided vehicle for temporary storage.

[0061] S7, the empty pallet is transported from the pallet lifting station 633 to the lower return conveying line of the sorting area 6 through the lifting mechanism, and then returned to the second shuttle vehicle 10, and returned to the pallet area 21 of the loading area 2 through the second shuttle vehicle 10.

[0062] By adopting the unloading system and method of the present invention, in some embodiments, a plate unloading cycle of 4 minutes per sheet can be achieved, and the lifting and sorting of a single plate can be completed within 4 minutes, and the number of workers is reduced by 80% compared with the traditional single-machine unloading method.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A plate automatic unloading system, characterized by: The invention comprises a raw material area (1), a loading area (2), a coding area (3), a cutting area (4), a buffer area (5), and a sorting area (6) which are arranged in sequence; the raw material area (1) and the loading area (2) are connected through a conveying roller (7); an intelligent driving vehicle (8) is arranged above the loading area (2), the coding area (3), the cutting area (4), and the buffer area (5); a shot blasting machine (71) is arranged on the conveying roller (7); the conveying roller (7) cooperates with the intelligent driving vehicle (8) to pre-treat the conveying roller (7); The finished plates are transported to the loading area (2) via an intelligent driving vehicle (8); a first shuttle vehicle (9) is provided between the loading area (2) and the coding area (3); a second shuttle vehicle (10) is provided between the buffer area (5) and the sorting area (6); the sorting area (6) includes a small piece sorting area (61) and a large piece sorting area (63) which are arranged in sequence, and also includes a small piece centralized sorting area (62) which is arranged side by side with the small piece sorting area (61) and is connected to the large piece sorting area (63) via a belt conveyor line (622).

2. The automatic sheet material unloading system according to claim 1 is characterized in that: The cutting area (4) is provided with a cutting machine (41), and a slag receiving plate chain (42) is provided directly below the cutting machine (41). The slag receiving plate chain (42) wraps around two driving sprockets (43) in a ring shape. The rotation of the driving sprockets (43) drives the slag receiving plate chain (42) to perform belt transmission movement. A slag cleaning trolley (44) for receiving slag is provided at the lower front end of the slag receiving plate chain (42) in the running direction.

3. The automatic sheet material unloading system according to claim 2 is characterized in that: A small piece material frame (621) is arranged between the small piece sorting area (61) and the small piece centralized sorting area (62) for storing small pieces of plate materials; the large piece sorting area (63) comprises a large piece sorting station (631), a waste material processing station (632), a tray lifting station (633), and a second stacking area (634) which are arranged in sequence; and a large piece material frame (635) for storing large pieces of plate materials is arranged in the second stacking area (634).

4. The automatic sheet material unloading system according to claim 3 is characterized in that: The loading area (2) comprises a pallet area (21) and a first palletizing area (22) which are arranged in sequence.

5. The automatic sheet material unloading system according to claim 4 is characterized in that: The sorting area (6) is provided with a plurality of sanding machines, including a first sanding machine (623) arranged on a belt conveyor, and a second sanding machine (636) arranged on one side of the large-piece sorting area (63); the sorting area (6) is also provided with a sorting robot (64) having a 3D visual recognition system and a sorting manipulator to identify the thickness of the plate and sort the plate according to the thickness to the corresponding first sanding machine (623) or second sanding machine (636).

6. A method for automatic sheet material unloading, characterized in that: The automatic plate unloading system according to claim 5 comprises the following steps: S1, after receiving the materials, the plates are unloaded and stored in the raw material area (1); S2, transporting the plates in the raw material area (1) to the shot blasting machine (71) on the conveyor roller (7) for shot blasting; S3, the intelligent crane (8) transports the plate to the loading area (2), and then transports it to the coding area (3) for coding via the first shuttle vehicle (9); S4, transporting the printed sheet to the cutting area (4) for cutting; S5, the cut plates are transported to the sorting area (6) via the second shuttle vehicle (10), and sorted and sanded according to size; S6, the plate after sanding is leveled and transported to the small piece material frame (621) or the second stacking area (634) according to the size; the remaining waste frame in the pallet is transported out; S7, the empty pallet is transported from the pallet lifting station (633) to the second shuttle vehicle (10), and then returned to the pallet area (21) of the loading area (2) through the second shuttle vehicle (10); In step S5, when the plates with a single side length of less than 900 mm account for more than 90% of the total number of plates in the batch, they are transported to the small piece centralized sorting area (62) for centralized sorting; when the plates with a single side length of less than 900 mm account for 90% or less than 90% of the total number of plates in the batch, they are first transported to the small piece sorting area (61) to sort out the small pieces, and then transported to the large piece sorting area (63) to sort out the large pieces.

7. The automatic sheet material unloading method according to claim 6, characterized in that: In step S4, the cutting machine (41) includes a plasma cutting machine (41) and a laser cutting machine (41); when the thickness of the plate is greater than 16 mm, the plate is assigned to the plasma cutting machine (41) for cutting; when the thickness of the plate is less than or equal to 16 mm, the plate is assigned to the laser cutting machine (41) for cutting; the slag generated during the cutting process falls onto the slag receiving plate chain (42), the slag is transmitted to the edge along the slag receiving plate chain (42) and then falls into the slag cleaning trolley (44), and the slag cleaning trolley (44) is transported out after being fully loaded.

8. The automatic sheet material unloading method according to claim 6, characterized in that: The automatic plate unloading system according to claim 5 also includes a central control system electrically connected to each area to realize overall scheduling of each link of the unloading system; in step S5, the sorting robot (64) is set at the belt conveyor line (622), and after identifying the thickness of the plate, the data is transmitted to the central control system. The central control system selectively issues an instruction to turn on or off the sanding machine according to the received plate thickness information, and the truss manipulator of the sorting robot (64) simultaneously transfers the cut plate to the sanding machine; when it is identified that the plate thickness is greater than 16mm, the sanding machine is turned on to grind the cutting slag of the plate. If the plate thickness is ≤16mm, the sanding machine is turned off to allow the plate to pass through the sanding machine empty.

9. The automatic sheet material unloading method according to claim 6, characterized in that: In step S3, the plates transferred to the loading area (2) by the intelligent driving vehicle (8) are preferentially transferred to the empty pallets in the pallet area (21). When there are no empty pallets in the pallet area (21), the transferred plates are placed in the first stacking area (22) for temporary storage. After the plates in the pallet area (21) are transported to the coding area (3), the plates temporarily stored in the first stacking area (22) are transferred to the pallet area (21). The shuttle vehicle transports the pallets carrying the plates from the pallet area (21) to the coding area (3) for coding.

10. The automatic sheet material unloading method according to claim 6, characterized in that: In steps S6 to S7, the sorting robot (64) moves in the small-piece material frame (621) and the second stacking area (634), and visually identifies the size of the plates. The sorting robot grabs the plates of the same size and places them in the same tray to achieve plate classification. The plates that cannot be stacked in time are transported to the outside of the second stacking area (634) by the conveyor chain for manual processing.

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