Automatic feeding and positioning device for large panels

Abstract

This invention discloses an automatic feeding and positioning device for large sheet metal, comprising a material rack mechanism, a driving mechanism, a clamping mechanism, and a positioning mechanism. The driving mechanism includes a first mounting bracket, a second mounting bracket, and a driving device mounted on the second mounting bracket. The first mounting bracket has a guide post mounting plate, and the second mounting bracket has guide posts. One end of each guide post passes through the guide post mounting plate and is positioned within the first mounting bracket. A stop plate is provided at the end of the guide post passing through the guide post mounting plate. A first elastic element is provided between the second mounting bracket and the guide post mounting plate, and a second elastic element is provided on the guide post between the stop plate and the guide post mounting plate. Through its structural design, this invention solves the problems of low processing positioning efficiency and unstable quality, thereby improving production efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the field of large-scale sheet metal processing, and in particular to an automatic feeding and positioning device for large-scale sheet metal. Background Technology

[0002] Currently, special tank containers use a variety of sheet metal sizes and bevel dimensions. The traditional method of loading and positioning involves manually hoisting the sheet metal onto a workbench using an overhead crane. This workbench is typically a fixed roller frame. The sheet metal is then manually pushed to its approximate position, and then positioned precisely using positioning fixtures to ensure the edge to be processed is relatively parallel to the vertical edge of the equipment platform. The other three edges of the sheet metal are loaded and positioned using the same method. This loading and positioning method is inefficient, labor-intensive, and the parallelism of the sheet metal edges relies entirely on the preceding sheet metal cutting process, leading to unstable diagonal dimensions and affecting subsequent welding processes. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an automatic feeding and positioning device for large sheet materials that offers high processing and positioning efficiency and stable quality.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic feeding and positioning device for large plates, including a material rack mechanism, a push-pull mechanism installed on one side of the material rack mechanism, and a positioning mechanism installed on the other side of the material rack mechanism. The push-pull mechanism includes a driving mechanism and a clamping mechanism. The driving mechanism is installed on the material rack mechanism and can move along the material rack mechanism. The clamping mechanism is installed on the driving mechanism. The driving mechanism includes a first mounting bracket, a second mounting bracket, and a driving device installed on the second mounting bracket. The first mounting bracket is provided with a guide post mounting plate, and the second mounting bracket is provided with a guide post. One end of the guide post passes through the guide post mounting plate and is disposed in the first mounting bracket. The end of the guide post passing through the guide post mounting plate is provided with a stop plate. A first elastic element is provided between the second mounting bracket and the guide post mounting plate, and a second elastic element is provided on the guide post between the stop plate and the guide post mounting plate. A first slider is provided on both the first mounting bracket and the second mounting bracket, and a first guide rail is provided on the material rack mechanism. The first slider cooperates with the first guide rail.

[0005] As a further improvement of the present invention, the clamping mechanism includes a clamping mounting bracket, a first pressure block, a second pressure block, and a first hydraulic cylinder. The first pressure block is mounted on the clamping mounting bracket, the first hydraulic cylinder is mounted on the clamping mounting bracket and is opposite to the first pressure block, and the second pressure block is mounted on the extended end of the first hydraulic cylinder and cooperates with the first pressure block to clamp the plate.

[0006] As a further improvement of the present invention, the clamping mounting bracket is provided with a second guide rail, the first mounting bracket is provided with a second slider, and the second guide rail and the second slider are connected in cooperation; a nitrogen spring is provided between the first mounting bracket and the clamping mounting bracket along the second guide rail, and the two ends of the nitrogen spring are respectively mounted on the first mounting bracket and the clamping mounting bracket.

[0007] As a further improvement of the present invention, the first mounting bracket is provided with a first proximity switch and a second proximity switch, the second mounting bracket is provided with a first positioning device, and the stop plate is provided with a second positioning device. The first proximity switch cooperates with the first positioning device, and the second proximity switch cooperates with the second positioning device.

[0008] As a further improvement of the present invention, the material rack mechanism includes a column, a material rack with an opening on the column, a roller frame that can be adjusted up and down inside the material rack, and a lifting mechanism for adjusting the roller frame.

[0009] As a further improvement of the present invention, the lifting mechanism includes a second hydraulic cylinder, an active arm and a driven arm. The active arm is rotatably mounted at the bottom of the material rack in the middle and its two ends are respectively connected to the hydraulic cylinder and the roller frame. The driven arm is rotatably mounted at the bottom of the material rack and is connected to the roller frame.

[0010] As a further improvement of the present invention, the positioning mechanism includes a positioning mounting plate disposed on the material rack, a rotating shaft and a cylinder disposed on the positioning mounting plate, and a rotatable positioning rod disposed on the rotating shaft, wherein the extended end of the cylinder is connected to the positioning rod.

[0011] As a further improvement of the present invention, the positioning mounting plate is provided with a third slider, and the material rack is provided with a third guide rail, the third slider cooperating with the third guide rail.

[0012] As a further improvement of the present invention, the driving device includes a drive motor, a reducer connected to the drive motor, and a drive gear disposed on the reducer. The material rack is provided with a drive rack, and the drive gear cooperates with the drive rack.

[0013] The processing steps of an automatic feeding and positioning device for large sheet metal as described above are as follows:

[0014] S1: The sheet is placed on the material rack mechanism, the positioning mechanism is in the retracted state, and the push-pull-back mechanism is located at the starting end of the material rack mechanism;

[0015] S2: Push the pull-back mechanism to start and push the plate towards the processing equipment until the plate contacts the limit plate on the processing equipment, and compress the first elastic element for initial positioning. After positioning, push the pull-back mechanism to stop moving.

[0016] S3: Fix the sheet metal onto the processing equipment, retract the limiting plate, push the pull-back mechanism to reset, and the processing equipment completes the processing of the sheet metal edge;

[0017] S4: Manually press the processed edge of the sheet metal against the clamping mechanism;

[0018] S5: The clamping mechanism starts and clamps the plate. The drive mechanism drives the clamping mechanism to move towards the positioning mechanism until the plate contacts the positioning mechanism and compresses the second elastic element for repositioning. After repositioning, the drive mechanism stops moving.

[0019] S6: The drive mechanism moves toward the processing equipment until the second elastic element is reset, and at the same time the clamping mechanism opens;

[0020] S7: The push-pull mechanism pushes the sheet material into the processing area, delivers it to the appropriate position to fix the sheet material, and completes the edge processing.

[0021] Through the above technical solution, the present invention has the following technical effects:

[0022] (1) By providing a first elastic element and a second elastic element on both sides of the guide post mounting plate, the plate will be continuously subjected to the thrust of the first elastic element when processing the first edge of the plate, so as to maintain the positioning size of the plate.

[0023] (2) The first edge is positioned by the positioning mechanism, and then the edge is processed by the pull-back mechanism to ensure the parallelism of the two edges being processed and to achieve semi-automatic processing, thereby improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is the front view of the present invention;

[0026] Figure 3 This is a side view of the present invention;

[0027] Figure 4 This is a schematic diagram of the propulsion and pull-back mechanism.

[0028] Figure 5 This is a schematic diagram of the positioning mechanism;

[0029] Figure 6 This is a schematic diagram of the overall structure of the present invention with an extended length;

[0030] Figure 7 This is a schematic diagram of the overall structure of the present invention;

[0031] The components in the attached diagram are labeled as follows:

[0032] 1. Material rack mechanism; 11. Column; 12. Material rack; 121. First guide rail; 122. Third guide rail; 123. Drive rack; 13. Roller frame; 14. Lifting mechanism; 141. Second hydraulic cylinder; 142. Driving arm; 143. Driven arm; 2. Push-pull-back mechanism; 21. Drive mechanism; 211. First mounting bracket; 2111. Second slider; 2112. First proximity switch; 2113. Second proximity switch; 212. Second mounting bracket; 2121. First positioning device; 213. Drive device; 2131. Drive motor; 2132. Reducer 2133. Drive gear; 214. Guide post; 215. Guide post mounting plate; 216. Stop plate; 2161. Second positioning device; 217. First elastic element; 218. Second elastic element; 219. First slider; 22. Clamping mechanism; 221. Clamping mounting bracket; 222. First pressure block; 223. Second pressure block; 224. First hydraulic cylinder; 225. Second guide rail; 23. Nitrogen spring; 3. Positioning mechanism; 31. Positioning mounting plate; 32. Rotary shaft; 33. Cylinder; 34. Positioning rod; 35. Third slider; 36. Positioning block; 4. Auxiliary roller. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The above descriptions are merely preferred embodiments of the invention and are not intended to limit the invention. For those skilled in the art, the invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

[0035] An automatic feeding and positioning device for large sheet metal, such as Figure 1-7As shown, the device includes a material rack mechanism 1, a push-pull-back mechanism 2 installed on one side of the material rack mechanism 1, and a positioning mechanism 3 installed on the other side of the material rack mechanism 1. The push-pull-back mechanism 2 includes a drive mechanism 21 and a clamping mechanism 22. The drive mechanism 21 is installed on the material rack mechanism 1 and can move along the material rack mechanism 1. The clamping mechanism 22 is installed on the drive mechanism 21. In this embodiment, the material racks 12 are arranged in pairs. The push-pull-back mechanism pushes the plate on the material rack mechanism 1 towards the processing equipment. When the plate contacts the limiting plate on the processing equipment, the push-pull-back mechanism 2 stops working. After the processing equipment fixes the plate, it processes the first edge. The processed edge is manually positioned and placed on the material rack 12. After the clamping mechanism 22 starts clamping the plate, the drive mechanism 21 pulls back towards the positioning mechanism 3 until the plate contacts the positioning mechanism 3. The drive mechanism 21 completes the positioning, stops working, and resets. The positioned plate is then pushed towards the processing equipment to complete the edge processing.

[0036] The driving mechanism 21 includes a hollow first mounting bracket 211 with an opening, a second mounting bracket 212 composed of two plates vertically connected, and a driving device 213 mounted on the second mounting bracket 212. The first mounting bracket 211 has a guide post mounting plate 215 welded to the side near the second mounting plate. The second mounting bracket 212 has two guide posts 214 on the side near the first mounting bracket 211. One end of each guide post 214 passes through the guide post mounting plate 215 and is disposed within the first mounting bracket 211. A stop plate is provided at the end of each guide post 214 passing through the guide post mounting plate 215. 216. A first elastic element 217 is provided between the second mounting bracket 212 and the guide post mounting plate 215. A second elastic element 218 is provided on the guide post 214 between the stop plate 216 and the guide post mounting plate 215. Both the first elastic element 217 and the second elastic element 218 are rectangular springs. Two first sliders 219 are provided on the side of the first mounting bracket 211 and the second mounting bracket 212 near the material rack mechanism 1. Two first guide rails 121 are provided on the side of the material rack mechanism 1 near the push-pull-back mechanism 2. The first sliders 219 cooperate with the first guide rails 121 to make the push-pull-back mechanism 2 move along the material rack mechanism 1. In this embodiment, to further ensure the positioning dimensions, when the edge of the sheet material to be processed contacts the positioning device on the processing equipment to complete the positioning, the first elastic element 217 in the drive mechanism 21 will be compressed, and the sheet material will be continuously subjected to the thrust of the first elastic element 217 to maintain the positioning dimensions of the sheet material during processing. After the processing equipment fixes the sheet material, the drive mechanism 21 pulls back. When the sheet material contacts the positioning mechanism 3, the second elastic element 218 will also be compressed to maintain the continuous thrust. At this time, the drive mechanism 21 stops pulling back to prevent the drive mechanism 21 from moving too far and damaging the positioning mechanism 3.

[0037] The clamping mechanism 22 includes a clamping mounting bracket 221, a first pressure block 222, a second pressure block 223, and a first hydraulic cylinder 224. The clamping mounting bracket 221 consists of a vertical plate and horizontal plates extending to the same side from both ends of the vertical plate. The first pressure block 222 is fixedly installed on the inner side of the horizontal plate at the top of the clamping mounting bracket 221. The first hydraulic cylinder 224 is installed on the outer side of the bottom end of the clamping mounting bracket 221 and its extended end passes through the bottom horizontal plate and is opposite to the first pressure block 222. The second pressure block 223 is installed on the extended end of the first hydraulic cylinder 224 and cooperates with the first pressure block 222 to clamp the plate. In this embodiment, during the pushing and pulling of the plate, the plate is positioned between the first pressure block 222 and the second pressure block 223. The driving mechanism 21 pushes the clamping mechanism 22 to move. To prevent the plate from directly contacting the clamping mounting bracket 221 and causing damage, an anti-collision block is provided on the inner side of the vertical plate between the two horizontal plates of the clamping mounting bracket 221. Since the first elastic element 217 and the second elastic element 218 provide a buffering effect, the anti-collision block can be made of flexible or rigid material. The second pressure block 223 is driven by the first hydraulic cylinder 224 to clamp the first pressure block 222, which can directly pull the plate back to the appropriate position and ensure accurate positioning. In addition, in order to keep the force uniform during clamping and prevent damage to the frame of the clamping mechanism 22 from long-term use, the first pressure block 222 and the second pressure block 223 are both universal structures. The interior of the first pressure block 222 and the second pressure block 223 is spherical (not shown in the figure). The first pressure block 222 and the second pressure block 223 are rotated by the limiting screw.

[0038] To ensure that the sheet metal moves horizontally on the material rack mechanism 1, a second guide rail 225 is provided on the side of the vertical plate of the clamping mounting bracket 221 near the first mounting bracket 211, and a second slider 2111 is provided on the side of the first mounting bracket 211 near the clamping mounting bracket 221. The second guide rail 225 and the second slider 2111 cooperate to allow the clamping mounting bracket 221 to move vertically on the first mounting bracket 211. A nitrogen spring 23 is provided between the first mounting bracket 211 and the clamping mounting bracket 221 along the second guide rail 225. The nitrogen spring 23 is arranged along the guide rail direction, with its bottom end mounted on the first mounting bracket 211 and its top end mounted on the clamping mounting bracket 221. In this embodiment, when the first hydraulic cylinder 224 drives the second pressure block 223 to approach the first pressure block 222 to clamp the plate, when the height of the second pressure block 223 is higher than the height of the material rack 12, the clamping mechanism 22 will be driven by the gravity of the plate to cause the nitrogen spring 23 to contract until the plate is pressed on the material rack 12 and the nitrogen spring 23 stops contracting. At this time, the upper surface of the second pressure block 223 is flush with the upper surface of the material rack 12. At the same time, the positions of the second guide rail 225 and the second slider 2111 on the first mounting bracket 211 and the clamping mounting bracket 221 can be arbitrarily interchanged, as long as the clamping mounting bracket 221 can be kept to move vertically on the first mounting bracket 211. This will not be described in detail here.

[0039] In another embodiment, the installation positions of the first hydraulic cylinder 224 and the first pressure block 222 can be interchanged. The second pressure block 223 is installed at the extended end of the first hydraulic cylinder 224, and the upper surface of the first pressure block 222 is flush with the upper surface of the material rack 12. At this time, the clamping mounting bracket 221 can be directly fixedly connected to the first mounting bracket 211, and clamping can be completed by driving the first hydraulic cylinder 224.

[0040] The first mounting bracket 211 has a first proximity switch 2112 and a second proximity switch 2113 located at one end near the second mounting bracket 212. The second mounting bracket 212 has a first positioning device 2121, and the stop plate 216 has a second positioning device 2161. The first proximity switch 2112 cooperates with the first positioning device 2121, and the second proximity switch 2113 cooperates with the second positioning device 2161. In this embodiment, when the push-pull mechanism 2 pushes the plate towards the processing equipment for positioning, the first elastic element 217 is compressed, causing the first proximity switch 2112 to move closer to the first positioning device 2121 until contact is made. After contact, the drive device 213 stops running. At this time, the plate is fixed by the push-pull mechanism 2 cooperating with the processing equipment. When the push-pull mechanism 2 clamps the plate and pulls it back for the second positioning, when the plate contacts the positioning mechanism 3, the second elastic element 218 is compressed, causing the second positioning device 2161 to move closer to the second proximity switch 2113 until contact is made. After contact, the drive device 213 stops running, completing the second positioning of the plate.

[0041] The material rack mechanism 1 includes a height-adjustable column 11, a material rack 12 with an opening on the column 11, a roller frame 13 that can be adjusted up and down inside the material rack 12, and a lifting mechanism 14 for adjusting the roller frame 13; the lifting mechanism 14 includes a second hydraulic cylinder 141, an active arm 142, and a driven arm 143. The active arm 142 is rotatably mounted at the bottom of the material rack 12 in the middle and its two ends are respectively connected to the hydraulic cylinder and the roller frame 13. The driven arm 143 is rotatably mounted at the bottom of the material rack 12 and connected to the roller frame 13. In this embodiment, the bottom of the material rack 12 is provided with a hydraulic cylinder mounting base, a drive arm 142 mounting base, and a driven arm 143 mounting base. The second hydraulic cylinder 141 is mounted on the hydraulic cylinder mounting base. The middle part of the drive arm 142 is rotatably mounted on the drive arm 142 mounting base. The driven arm 143 is mounted on the driven arm 143 mounting base. The drive arm 142, the driven arm 143, and the roller frame 13 form a four-bar linkage system. The roller frame 13 can be raised or lowered by the lifting mechanism 14. The roller frame 13 is raised during pushing and pulling. 3. The roller frame 13 is made higher than the upper surface of the material rack 12, so that the sheet material only contacts the rollers, reducing the friction force during pushing and pulling. When processing the sheet material, the roller frame 13 is retracted so that the height of the roller frame 13 is lower than the upper surface of the material rack 12, so that the pressure of the sheet material is applied to the material rack 12, thereby increasing the service life of the roller frame 13. In order to perform preliminary and rapid positioning of the two unprocessed edges in one direction, an auxiliary roller 4 is also provided on one side of the outermost material rack 12. Rapid positioning is achieved by cooperating the processed edge of the sheet material with the auxiliary roller 4.

[0042] The positioning mechanism 3 includes a positioning mounting plate 31 on the material rack 12, a rotating shaft 32 and a cylinder 33 on the side of the positioning mounting plate 31 away from the material rack 12, and a rotatable positioning rod 34 on the rotating shaft 32. The extended end of the cylinder 33 is connected to the positioning rod 34. In this embodiment, the positioning rod 34 is L-shaped. One end of the positioning rod 34 is connected to the rotating shaft 32. A connecting end extends from the side of the positioning rod 34 away from the rotating shaft 32 and away from the material rack 12. The extended end of the cylinder 33 is connected to the connecting end. Through the extension and retraction of the cylinder 33, the positioning rod 34 can be rotated along the rotating shaft 32 to adjust its height, facilitating the loading and unloading of the sheet metal. At the same time, a rigid positioning block 36 is also provided at the end of the positioning rod 34 away from the rotating shaft 32. The positioning block 36 is C-shaped and has protruding ribs inside. The positioning rod 34 has grooves that can cooperate with the ribs. The positioning block 36 can be quickly replaced and the positioning size can be finely adjusted through the ribs and grooves. The positioning blocks 36 are available in three different thicknesses and are placed next to the positioning mechanism 3. The positioning blocks 36 can prevent damage when the sheet metal comes into contact with the positioning mechanism 3.

[0043] The positioning mounting plate 31 has a third slider 35 on the side near the material rack 12, and a third guide rail 122 is provided on the side of the material rack 12 near the positioning mechanism 3. The third slider 35 and the third guide rail 122 cooperate to move the positioning mechanism 3 along the material rack 12. In this embodiment, the third guide rail 122 and the third slider 35 are provided to accommodate sheet metal of different sizes.

[0044] The drive device 213 includes a drive motor 2131, a reducer 2132 connected to the drive motor 2131, and a drive gear 2133 disposed on the reducer 2132. The material rack 12 is provided with a drive rack 123, which is disposed along the first slide rail. The drive gear 2133 cooperates with the drive rack 123 to move the drive mechanism 21 on the material rack 12.

[0045] The specific working steps of this invention are as follows:

[0046] S1: Place the board horizontally on the material rack 12. At this time, the roller rack 13 and the positioning mechanism 3 are both in the retracted state. The push-pull mechanism 2 is at the starting end of the material rack 12 to facilitate the hoisting of the board. At this time, the height of the second pressure block 223 is slightly lower than the upper surface of the material rack 12.

[0047] S2: The roller frame 13 is lifted by the lifting mechanism 14, and the plate is above the material rack 12, so that the plate only contacts the rollers, reducing the frictional resistance during movement; a positioning plate is provided on the connected processing equipment for the initial positioning of the plate. At this time, the first pressure block 222 and the second pressure block 223 do not contact the plate. The push-pull mechanism pushes the plate on the roller frame 13 to move towards the processing equipment until the plate contacts the limit plate on the processing equipment. The first elastic element 217 inside the push-pull mechanism 2 will be compressed until the first proximity switch 2112 is triggered, and the push-pull mechanism 2 stops working. At this time, the plate will be subjected to continuous thrust to ensure the positioning size of the plate.

[0048] S3: Fix the sheet metal on the processing equipment and retract the limiting plate. Push the pull-back mechanism 2 to reset. The processing equipment completes the processing of the sheet metal edge. During processing, the roller frame 13 is in the retracted state.

[0049] S4: The first edge of the processed sheet is manually positioned against the anti-collision block on the clamping mechanism 22 to ensure the parallelism of the two sides after processing;

[0050] S5: The clamping mechanism 22 starts and clamps the plate, the lifting roller frame 13 is higher than the material rack 12, and the driving mechanism 21 drives the clamping mechanism 22 to move towards the positioning mechanism 3 until the plate contacts the positioning mechanism 3 and compresses the second elastic element 218. The driving motor 2131 stops moving and completes repositioning after the second proximity switch 2113 is triggered.

[0051] S6: Drive motor 2131 slowly moves toward the processing equipment until the second elastic element 218 is reset, and the clamping mechanism is also opened at the same time.

[0052] S7: The push-pull mechanism 2 pushes the plate into the processing area of ​​the processing equipment again until it is delivered to the appropriate position to complete the processing. At this time, the positioning plate of the equipment is not started, and the travel distance is controlled by the push-pull mechanism 2.

[0053] The processing of the other two sides of the board can repeat the above steps. When the length-to-width ratio of the board is large, two of the material racks 12 can be lengthened to achieve the processing of larger board sizes.

[0054] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An automatic feeding and positioning device for large sheet metal, characterized in that, The device includes a material rack mechanism (1), a push-pull mechanism (2) mounted on one side of the material rack mechanism (1), and a positioning mechanism (3) mounted on the other side of the material rack mechanism (1). The push-pull mechanism (2) includes a drive mechanism (21) and a clamping mechanism (22). The drive mechanism (21) is mounted on the material rack mechanism (1) and can move along the material rack mechanism (1). The clamping mechanism (22) is mounted on the drive mechanism (21). The drive mechanism (21) includes a first mounting bracket (211), a second mounting bracket (212), and a drive device (213) mounted on the second mounting bracket (212). The first mounting bracket (211) is provided with a guide post mounting plate (215), and the second mounting bracket (212) is provided with a guide post mounting plate (215). A column (214) is provided, with one end of the guide column (214) passing through the guide column mounting plate (215) and set inside the first mounting bracket (211). A stop plate (216) is provided at the end of the guide column (214) passing through the guide column mounting plate (215). A first elastic element (217) is provided between the second mounting bracket (212) and the guide column mounting plate (215). A second elastic element (218) is provided on the guide column (214) between the stop plate (216) and the guide column mounting plate (215). A first slider (219) is provided on both the first mounting bracket (211) and the second mounting bracket (212). A first guide rail (121) is provided on the material rack mechanism (1). The first slider (219) cooperates with the first guide rail (121). The first mounting bracket (211) is provided with a first proximity switch (2112) and a second proximity switch (2113). The second mounting bracket (212) is provided with a first positioning device (2121). The stop plate (216) is provided with a second positioning device (2161). The first proximity switch (2112) cooperates with the first positioning device (2121), and the second proximity switch (2113) cooperates with the second positioning device (2161). The material rack mechanism (1) includes a column (11), a material rack (12) with an opening on the column (11), a roller frame (13) that can be adjusted up and down inside the material rack (12), and a lifting mechanism (14) for adjusting the roller frame (13).

2. The automatic feeding and positioning device for large-scale plates according to claim 1, characterized in that, The clamping mechanism (22) includes a clamping mounting bracket (221), a first pressure block (222), a second pressure block (223), and a first hydraulic cylinder (224). The first pressure block (222) is mounted on the clamping mounting bracket (221), the first hydraulic cylinder (224) is mounted on the clamping mounting bracket (221) and is opposite to the first pressure block (222), and the second pressure block (223) is mounted on the extended end of the first hydraulic cylinder (224) and cooperates with the first pressure block (222) to clamp the plate.

3. The automatic feeding and positioning device for large-scale plates according to claim 2, characterized in that, The clamping mounting bracket (221) is provided with a second guide rail (225), and the first mounting bracket (211) is provided with a second slider (2111). The second guide rail (225) and the second slider (2111) are connected in cooperation. A nitrogen spring (23) is provided between the first mounting bracket (211) and the clamping mounting bracket (221) along the second guide rail (225). The two ends of the nitrogen spring (23) are respectively mounted on the first mounting bracket (211) and the clamping mounting bracket (221).

4. The automatic feeding and positioning device for large-scale plates according to claim 1, characterized in that, The lifting mechanism (14) includes a second hydraulic cylinder (141), an active arm (142), and a driven arm (143). The active arm (142) is rotatably mounted at the bottom of the material rack (12) and its two ends are connected to the hydraulic cylinder and the roller frame (13) respectively. The driven arm (143) is rotatably mounted at the bottom of the material rack (12) and connected to the roller frame (13).

5. The automatic feeding and positioning device for large-scale plates according to claim 1, characterized in that, The positioning mechanism (3) includes a positioning mounting plate (31) on the material rack mechanism (1), a rotating shaft (32) and a cylinder (33) on the positioning mounting plate (31), and a rotatable positioning rod (34) on the rotating shaft (32). The extended end of the cylinder (33) is connected to the positioning rod (34).

6. The automatic feeding and positioning device for large-scale plates according to claim 5, characterized in that, The positioning mounting plate (31) is provided with a third slider (35), and the material rack mechanism (1) is provided with a third guide rail (122). The third slider (35) cooperates with the third guide rail (122).

7. The automatic feeding and positioning device for large-scale plates according to claim 1, characterized in that, The drive device (213) includes a drive motor (2131), a reducer (2132) connected to the drive motor (2131), and a drive gear (2133) provided on the reducer (2132). The material rack mechanism (1) is provided with a drive rack (123), and the drive gear (2133) cooperates with the drive rack (123).

8. A processing step of an automatic feeding and positioning device for large plates according to any one of claims 1-7, characterized in that, The steps are as follows: S1: The plate is placed on the material rack mechanism (1), the positioning mechanism (3) is in the retraction state, and the push-pull mechanism (2) is located at the starting end of the material rack mechanism (1); S2: Push the pull-back mechanism to start and push the plate towards the processing equipment until the plate contacts the limit plate on the processing equipment, and compress the first elastic element (217) for initial positioning. After positioning, push the pull-back mechanism to stop moving. S3: Fix the plate on the processing equipment, retract the limiting plate, push the pull-back mechanism (2) to reset, and the processing equipment completes the processing of the plate edge; S4: The processed edge of the sheet metal is manually pressed against the clamping mechanism (22); S5: The clamping mechanism (22) starts and clamps the plate. The driving mechanism (21) drives the clamping mechanism (22) to move towards the positioning mechanism (3) until the plate contacts the positioning mechanism (3) and compresses the second elastic element (218) for repositioning. After repositioning, the driving mechanism (21) stops moving. S6: The drive mechanism (21) moves toward the processing equipment until the second elastic element (218) is reset, and the clamping mechanism opens at the same time; S7: The push-pull mechanism (2) pushes the plate into the processing area, delivers it to the appropriate position to fix the plate, and completes the edge processing.

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