Iron sheet feeding machine

Abstract

The application relates to a sheet iron feeding machine, and belongs to the technical field of can-making auxiliary equipment. The sheet iron feeding machine comprises a frame body and a conveying belt installed on the frame body. One side of the frame body close to a feeding end of the conveying belt is provided with a workbench for placing stacked sheet iron. The workbench is provided with a lifting assembly for driving the sheet iron to move along the height direction of the frame body. A plurality of first hydraulic cylinders are hingedly connected to the frame body and sequentially arranged along the width direction of the frame body and towards the workbench. The extension rods of the first hydraulic cylinders are downwardly provided with suction cups. The frame body is provided with a swing assembly for driving the first hydraulic cylinders to swing. The application has the effects of facilitating the adsorption of sheet iron and reducing the adverse influence on work efficiency.

Description

Technical Field

[0001] This application relates to the technical field of can-making auxiliary equipment, and in particular to a sheet metal feeding machine. Background Technology

[0002] When making cans from sheet metal, a sheet metal feeding machine is usually needed to move the vertically stacked sheet metal sheets sequentially onto the conveyor belt of the can-making production line.

[0003] Chinese Patent Publication No. CN214827201U discloses a sheet metal adsorption and feeding mechanism, which includes a lifting component for lifting sheet metal from one side of a conveyor belt and a swing component for moving sheet metal to the edge of the conveyor belt. The swing component is located between the conveyor belt and the lifting component. The lifting component includes a vertically arranged adsorption cylinder, and the swing component includes an inclined adjustment cylinder and a horizontally arranged connecting rod. The length direction of the connecting rod is perpendicular to the conveying direction of the conveyor belt. A swing rod is sleeved on the connecting rod. The swing rod is hinged to the piston rod of the adjustment cylinder. Suction cups are provided at the ends of the piston rod of the adsorption cylinder and the swing rod near the sheet metal. Suction cups are provided with suction pipes connected to a vacuum generator. This mechanism has the advantage of facilitating sheet metal feeding.

[0004] Because sheet metal is large and easily bent, the sheet metal adsorption and feeding equipment in related technologies moves and lifts the sheet metal by moving the adsorption cylinder located at one end of the sheet metal. Then, the adjusting cylinder drives the swing rod to swing through the connecting rod. At this time, the suction cup on the swing rod adsorbs the end of the sheet metal away from the adsorption cylinder, thereby lifting and moving the sheet metal. This may cause the suction cup on the swing rod to be difficult to adsorb onto the sheet metal, which will have an adverse effect on the work efficiency. Utility Model Content

[0005] In order to facilitate the adsorption of iron sheets and reduce the adverse impact on work efficiency, this application provides an iron sheet feeding machine.

[0006] The sheet metal feeding machine provided in this application adopts the following technical solution: A sheet metal feeding machine includes a frame and a conveyor belt mounted on the frame. A worktable for placing stacked sheet metal is provided on one side of the frame near the feeding end of the conveyor belt. A lifting assembly for driving the sheet metal to move along the height direction of the frame is provided on the worktable. A plurality of first hydraulic cylinders are hinged to the frame and arranged sequentially towards the worktable along the width direction of the frame. The telescopic rods of the first hydraulic cylinders point downward and are equipped with suction cups. A swing assembly for driving the first hydraulic cylinders to swing is provided on the frame.

[0007] By adopting the above technical solution, stacked iron sheets are placed on the workbench. The lifting component drives the iron sheets to move close to the suction cup. At this time, the swing component drives the first hydraulic cylinder to swing towards the iron sheets, and the extension rod of the first hydraulic cylinder drives the suction cup to approach and adhere to the iron sheets. The swing component drives the first hydraulic cylinder to swing towards the conveyor belt and moves the end of the iron sheets onto the conveyor belt. At this time, the suction cup detaches from the iron sheets, making it easier for the conveyor belt to move the iron sheets to the next process, thereby facilitating the adsorption of iron sheets and reducing the adverse impact on work efficiency.

[0008] Optionally, the swing assembly includes a swing rod that is fixedly connected to the upper side of the first hydraulic cylinder. The swing rod is arranged along the width direction of the frame and rotatably connected to the frame. One end of the swing rod is sleeved and fixedly connected to a connecting rod arranged along the length direction of the frame. The end of the connecting rod away from the swing rod is provided with a rotating component that drives the swing rod to rotate around its own rotation axis.

[0009] By adopting the above technical solution, the end of the rotating component driving the connecting rod away from the swing rod rotates along the rotation axis of the swing rod, which facilitates driving the swing rod to rotate the first hydraulic cylinder towards or away from the iron sheet, thereby facilitating the driving of the first hydraulic cylinder and the suction cup to adsorb the iron sheet and reducing the adverse impact on work efficiency.

[0010] Optionally, the rotating component includes a drive rod hinged to the end of the connecting rod away from the swing rod, the drive rod being inclined downwards and away from the swing rod, and a second hydraulic cylinder being hinged to the end of the drive rod away from the connecting rod and fixedly connected to the side wall of the frame.

[0011] By adopting the above technical solution, the telescopic rod of the second hydraulic cylinder extends and causes the drive rod to move closer to the connecting rod, thereby driving the connecting rod to rotate the swing rod. At this time, the first hydraulic cylinder swings with the swing rod, which facilitates the driving of the first hydraulic cylinder and the suction cup to adsorb the iron sheet, reducing the adverse impact on work efficiency.

[0012] Optionally, the upper side of the workbench is provided with a support plate for supporting stacked iron sheets. The lifting assembly includes hinge rods that correspond one-to-one with the support plate and the workbench and are hinged to the same end on the same side of the support plate and the workbench. The hinge rods are arranged crosswise and hinged in the middle. A third hydraulic cylinder is installed at the end of each hinge rod that is hinged to the support plate away from its own hinge end to drive the end of the hinge rod to slide. The support plate and the other side of the workbench have the same structure.

[0013] By adopting the above technical solution, the extension or retraction of the telescopic rod of the third hydraulic cylinder drives the end of the hinge rod connected to the third hydraulic cylinder to slide on the support plate and the worktable respectively. At this time, the other end of the hinge rod rotates and drives the support plate to rise or fall, which makes it easier to move the iron sheet placed on the support plate closer to the suction cup and improves work efficiency.

[0014] Optionally, the lower side of the frame near the workbench is provided with a plurality of air knives arranged circumferentially along the stacked iron sheets and parallel to the height direction of the frame. The air knives are all facing the iron sheets and can spray air onto the stacked iron sheets.

[0015] By adopting the above technical solution, air is sprayed between the iron sheets located on the upper side through the air knife, which facilitates the separation of the iron sheets that are electrostatically attracted by the air, reduces the adverse effects on subsequent processing caused by the suction cup moving multiple iron sheets at the same time, and thus reduces the adverse effects on work efficiency.

[0016] Optionally, the workbench includes a workbench body and a sliding plate slidably connected to the upper side of the workbench body. The sliding direction of the sliding plate is perpendicular to the length direction of the frame. The support plate and the hinge rod are both mounted on the sliding plate. A lead screw that is threadedly connected to the sliding plate is rotatably connected to the workbench body.

[0017] By adopting the above technical solution, when the stacked iron sheets are placed on the support plate, the support plate is driven to descend, the lead screw is rotated and the sliding plate is driven to move the support plate away from the table body. At this time, the support plate is located on the outside of the frame, which is convenient for placing the stacked iron sheets. After the iron sheets are placed, the sliding plate is driven to reset the support plate, thereby improving work efficiency.

[0018] Optionally, the support plate has a mounting platform for placing stacked iron sheets in the middle of its upper side. The support plate has multiple limiting plates arranged around the circumference of the mounting platform. Each limiting plate has a sliding rod fixedly connected to its lower side, which is inserted into the limiting plate and slidably connected to it. A spring is installed between the lower end of the sliding rod and the support plate. The limiting plates move simultaneously toward or away from the mounting platform. The support plate has a driving component for driving the limiting plates to move.

[0019] By adopting the above technical solution, stacked iron sheets are placed on the mounting platform. At this time, the driving component makes the sliding rod and the limiting plate located on the upper edge of the support plate, and the spring is stretched. After the iron sheet is placed, the driving component resets. At this time, the spring pulls the corresponding sliding rod and the limiting plate to move closer to the iron sheet and adjust the position of the iron sheet on the mounting platform until the center of the iron sheet coincides with the center of the mounting platform. This facilitates the air jet to be driven to the air knife, reduces the possibility of the iron sheet tilting in the vertical direction, and reduces the adverse impact on work efficiency.

[0020] Optionally, the driving component includes a disk located on the upper side of the support plate and rotatably connected to the support plate. The rotation axis of the disk coincides with the center line of the support plate. Each disk is fixedly connected with a driving block corresponding to a sliding rod. The width of the driving block gradually decreases towards the side away from the center of the disk. The sliding rod abuts against the side wall of the corresponding driving block. The support plate is provided with a first motor that drives the disk to rotate.

[0021] By adopting the above technical solution, when the iron sheet is placed on the mounting platform, the first motor drives the disc to rotate the drive block and pushes the sliding rod through the inclined surface of the drive block to move the limiting plate away from the mounting platform until the limiting plate moves to the edge of the support plate. At this time, the spring is stretched, which makes it easier to place the stacked iron sheets on the mounting platform. After placement, the disc is rotated in the opposite direction. At this time, the drive block rotates and resets, and the spring recovers its deformation and pulls the sliding rod to move the limiting plate closer to the mounting platform and adjust the position of the iron sheet, reducing the possibility of the iron sheet tilting in the vertical direction and reducing the adverse impact on work efficiency.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Drive the sheet metal to move close to the suction cup. At this time, the swing assembly drives the first hydraulic cylinder to swing towards the sheet metal and the extension rod of the first hydraulic cylinder drives the suction cup to approach and adhere to the sheet metal. The swing assembly drives the first hydraulic cylinder to swing towards the conveyor belt and moves the end of the sheet metal onto the conveyor belt. At this time, the suction cup detaches from the sheet metal, making it easier for the conveyor belt to move the sheet metal to the next process. 2. By extending or shortening the telescopic rod of the third hydraulic cylinder, the end of the hinge rod connected to the third hydraulic cylinder slides on the support plate and the worktable respectively. At this time, the other end of the hinge rod rotates and drives the support plate to rise or fall, which makes it easier to move the iron sheet placed on the support plate closer to the suction cup and improve work efficiency. 3. Drive the support plate to descend, rotate the lead screw and drive the sliding plate to move the support plate away from the platform body. At this time, the support plate is located on the outside of the frame, which is convenient for placing the stacked iron sheets. After the iron sheets are placed, drive the sliding plate to reset the support plate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the sheet metal feeding machine in Embodiment 1 of this application.

[0024] Figure 2 This is a structural schematic diagram illustrating the positional relationship between the swing component and the frame in Embodiment 1 of this application.

[0025] Figure 3 This is a structural schematic diagram illustrating the positional relationship between the platform body and the sliding plate in Embodiment 2 of this application.

[0026] Figure 4 This is a structural diagram illustrating the positional relationship between the support plate and the limiting plate in Embodiment 2 of this application.

[0027] Figure 5 This is a structural schematic diagram illustrating the positional relationship between the support plate and the driving component in Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Conveyor belt; 12. Air knife; 121. Stabilizing bar; 13. First hydraulic cylinder; 131. Suction cup; 132. Fixing rod; 2. Worktable; 21. Table body; 22. Sliding plate; 221. Roller; 23. Lead screw; 231. Second motor; 3. Support plate; 31. Mounting platform; 32. Sliding groove; 4. Lifting assembly; 41. Hinge rod; 42. Third hydraulic cylinder; 5. Swing assembly; 51. Swing rod; 52. Connecting rod; 53. Rotating component; 531. Drive rod; 532. Mounting shell; 5321. Waist-shaped hole; 533. Second hydraulic cylinder; 6. Limiting plate; 61. Sliding rod; 62. Spring; 7. Drive component; 71. Disc; 72. First motor; 73. Drive block; 731. Insertion hole. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This application discloses a sheet metal feeding machine. Example 1

[0031] Reference Figure 1 and Figure 2 A sheet metal feeding machine includes a frame 1 and a conveyor belt 11 installed on the lower side of the frame 1 and arranged along the length of the frame 1. A workbench 2 is provided on the lower side of the frame 1 near the feeding end of the conveyor belt 11. The conveyor belt 11 conveys sheet metal away from the workbench 2. A horizontal support plate 3 is provided on the upper side of the workbench 2. A horizontal mounting platform 31 for placing sheet metal is installed at the center of the upper side of the support plate 3. A lifting assembly 4 for driving the support plate 3 to move vertically is provided on the workbench 2.

[0032] The frame 1 has multiple vertical air blades 12 arranged around the mounting platform 31 on its lower side near the support plate 3. Each air blade 12 faces the mounting platform 31, and a vertical stabilizing rod 121 with its upper end fixedly connected to the frame 1 is located on the side of the air blade 12 away from the mounting platform 31. When stacked iron sheets are placed on the mounting platform 31, the upper iron sheets are directly opposite the air blades 12.

[0033] Multiple first hydraulic cylinders 13 are arranged sequentially along the width direction of the frame 1 and located at the end of the support plate 3 near the conveyor belt 11. In this embodiment, three cylinders are used. The telescopic rods of the first hydraulic cylinders 13 all point downwards and toward the sheet metal, and each telescopic rod of the first hydraulic cylinder 13 is equipped with a suction cup 131. The upper end of each first hydraulic cylinder 13 is fixedly connected to a fixing rod 132 facing one side of the frame 1. The frame 1 is provided with a swing assembly 5 that drives the lower end of the fixing rod 132 to swing simultaneously toward or away from the conveyor belt 11 and to attract the sheet metal.

[0034] The stacked sheet metal is placed on the workbench 2. The lifting assembly 4 drives the sheet metal to move close to the suction cup 131. At this time, the swing assembly 5 drives the first hydraulic cylinder 13 to swing towards the sheet metal, and the extension rod of the first hydraulic cylinder 13 drives the suction cup 131 to approach and adhere to the sheet metal. The swing assembly 5 drives the first hydraulic cylinder 13 to swing towards the conveyor belt 11 and moves the end of the sheet metal onto the conveyor belt 11. At this time, the suction cup 131 detaches from the sheet metal, making it easier for the conveyor belt 11 to move the sheet metal to the next process.

[0035] By spraying air through the air knife 12 between the iron sheets located on the upper side, it is easier to separate the iron sheets that have generated electrostatic adsorption by air, and reduce the adverse effects on subsequent processing caused by the suction cup 131 moving multiple iron sheets at the same time.

[0036] Reference Figure 1 and Figure 2 The lifting assembly 4 includes two hinge rods 41 located between the support plate 3 and the worktable 2 and corresponding to each other. The hinge rods 41 are arranged crosswise and hinged to each other in the middle. The hinge rods 41 are located on the same side of the support plate 3 and the worktable 2. The end of the hinge rod 41 corresponding to the support plate 3 away from the conveyor belt 11 is hinged to the lower side of the support plate 3, and the end of the hinge rod 41 corresponding to the worktable 2 away from the conveyor belt 11 is hinged to the upper side of the worktable 2.

[0037] The hinge rod 41 that is hinged to the support plate 3 is connected to a horizontal third hydraulic cylinder 42 at one end near the conveyor belt 11. The third hydraulic cylinder 42 on the hinge rod 41 corresponding to the support plate 3 is fixedly connected to the worktable 2. The support plate 3 and the worktable 2 are equipped with hinge rods 41 with the same structure on the side away from the hinge rod 41.

[0038] The extension or retraction of the telescopic rod of the third hydraulic cylinder 42 drives the end of the hinge rod 41 connected to the third hydraulic cylinder 42 to slide. At this time, the other end of the hinge rod 41 rotates and drives the support plate 3 to rise or fall.

[0039] Reference Figure 1 and Figure 2The swing assembly 5 includes a horizontal swing rod 51 disposed on the upper side of the fixed rod 132 and arranged along the width direction of the frame 1. The upper ends of the fixed rod 132 are all sleeved on the swing rod 51 and fixedly connected to the swing rod 51. The ends of the swing rod 51 all pass through the frame 1 and are rotatably connected to the frame 1. A connecting rod 52 is provided on one side of the frame 1, with its end sleeved on one end of the swing rod 51 passing through the frame 1 and fixedly connected to the swing rod 51. The connecting rod 52 is arranged along the length direction of the frame 1, and a rotating component 53 is provided at the end of the connecting rod 52 away from the swing rod 51 to drive the swing rod 51 to rotate along its own rotation axis.

[0040] The rotating component 53 includes a drive rod 531, one end of which is hinged to the end of the connecting rod 52 away from the swing rod 51. The drive rod 531 is inclined downwards and away from the swing rod 51. A mounting shell 532 is fixedly connected to the side of the frame 1 near the drive rod 531. The upper side of the mounting shell 532 has an oblong hole 5321 adapted to the movement trajectory of the drive rod 531. The lower end of the drive rod 531 is inserted into the mounting shell 532 through the oblong hole 5321. A second hydraulic cylinder 533 is provided in the mounting shell 532 facing the drive rod 531. The lower end of the second hydraulic cylinder 533 is hinged to the inner wall of the mounting shell 532. The extension rod of the second hydraulic cylinder 533 is upward and fixedly connected to the lower end of the drive rod 531.

[0041] The extension rod of the second hydraulic cylinder 533 extends, causing the drive rod 531 to move closer to the connecting rod 52, thereby driving the connecting rod 52 to rotate the swing rod 51. At this time, the fixed rod 132 drives the first hydraulic cylinder 13 to swing with the swing rod 51, which facilitates the driving of the first hydraulic cylinder 13 and the suction cup 131 to adsorb the iron sheet.

[0042] The implementation principle of Example 1 is as follows: The stacked iron sheets are placed on the workbench 2, and the iron sheets are driven to move close to the suction cup 131. At this time, the first hydraulic cylinder 13 is driven to swing towards the iron sheets, and the extension rod of the first hydraulic cylinder 13 drives the suction cup 131 to approach and adhere to the iron sheets. The first hydraulic cylinder 13 is driven to swing towards the conveyor belt 11 and drive the end of the iron sheets to move onto the conveyor belt 11. At this time, the suction cup 131 is detached from the iron sheets, so that the conveyor belt 11 can move the iron sheets to the next process. Example 2

[0043] Reference Figure 3The difference between this embodiment and Embodiment 1 is that the workbench 2 includes a table body 21 and a horizontal sliding plate 22 that is inserted into and slidably connected to the upper side of the table body 21. The hinge rod 41 and the support plate 3 are both mounted on the sliding plate 22. Two horizontal lead screws 23, which are arranged along the width direction of the frame 1, are passed through and rotatably connected to the table body 21. The ends of the lead screws 23 are inserted into the sliding plate 22 and threadedly connected to the sliding plate 22. A second motor 231, which is fixedly connected to the table body 21, is installed at the end of the lead screw 23 away from the sliding plate 22. A roller 221 is rotatably connected to the lower side of the sliding plate 22 away from the second motor 231. The roller 221 is always located outside the table body 21.

[0044] When the stacked iron sheets are placed on the support plate 3, the support plate 3 is driven to descend. The second motor 231 drives the lead screw 23 to rotate and drives the sliding plate 22 to move the support plate 3 away from the platform body 21. At this time, the roller 221 contacts the ground and rotates, thereby supporting the sliding plate 22, until the support plate 3 moves to the outside of the frame 1, which is convenient for placing the stacked iron sheets. After the iron sheets are placed, the sliding plate 22 drives the support plate 3 to reset, completing the iron sheet placement.

[0045] Reference Figure 3 and Figure 4 The support plate 3 has three vertical limiting plates 6 evenly distributed along the three sides of the mounting platform 31, except for the side closest to the conveyor belt 11. A vertical sliding rod 61 is fixedly connected to the center of the lower side of each limiting plate 6. The support plate 3 has sliding grooves 32 corresponding to the sliding rods 61 and facing the mounting platform 31. The lower ends of the sliding rods 61 are inserted into their respective sliding grooves 32 and slidably connected to the support plate 3. Each sliding groove 32 has a spring 62, one end of which is fixedly connected to the sliding rod 61, and the other end is fixedly connected to the support plate 3. When the spring 62 is at its original length, the sliding rod 61 is located at the end of the sliding groove 32 closest to the mounting platform 31. The support plate 3 has a driving component 7 that drives the limiting plates 6 to move away from the mounting platform 31.

[0046] Reference Figure 3 , Figure 4 and Figure 5 The driving component 7 includes a disk 71 located on the upper side of the support plate 3 with its rotation axis coinciding with the center line of the support plate 3. A first motor 72, located in the support plate 3 and fixedly connected to the support plate 3, is mounted on the lower side of the disk 71. A driving block 73, corresponding to a sliding rod 61, is fixedly connected to the disk 71 circumferentially. The driving block 73 and the disk 71 are integrally formed. The width of the driving block 73 gradually decreases towards the side away from the axis of the disk 71, allowing each sliding rod 61 to abut against the inclined side of its corresponding driving block 73. Each driving block 73 has an insertion hole 731 at its end away from the disk 71. When the sliding rod 61 is located at the end of the sliding groove 32 away from the mounting platform 31, the sliding rod 61 is inserted into the corresponding insertion hole 731.

[0047] When the iron sheet is placed on the mounting platform 31, the first motor 72 drives the disc 71 to rotate the drive block 73 and pushes the sliding rod 61 through the inclined surface of the drive block 73 to move the limiting plate 6 away from the mounting platform 31 until the limiting plate 6 moves to the edge of the support plate 3. At this time, the sliding rod 61 is inserted into the corresponding insertion hole 731, and the spring 62 is stretched, which makes it easier to place the stacked iron sheets on the mounting platform 31.

[0048] After placement, rotate the disc 71 in the opposite direction. At this time, the drive block 73 rotates and resets, and the spring 62 recovers its deformation and pulls the sliding rod 61 to move the limit plate 6 towards the mounting platform 31 and adjust the position of the iron piece, reducing the possibility of the iron piece tilting in the vertical direction.

[0049] The implementation principle of Example 2 is as follows: When the stacked iron sheets are placed on the support plate 3, the support plate 3 is driven to descend, and the sliding plate 22 is driven to move the support plate 3 away from the platform body 21 until the support plate 3 is moved to the outside of the frame 1, which is convenient for placing the stacked iron sheets. After the iron sheets are placed, the sliding plate 22 is driven to reset the support plate 3, thus completing the placement of the iron sheets.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sheet metal feeding machine, characterized in that: The device includes a frame (1) and a conveyor belt (11) mounted on the frame (1). A workbench (2) for stacking iron sheets is provided on the side of the frame (1) near the loading end of the conveyor belt (11). A lifting assembly (4) for driving the iron sheets to move along the height direction of the frame (1) is provided on the workbench (2). Multiple first hydraulic cylinders (13) are hinged on the frame (1) and arranged sequentially towards the workbench (2) along the width direction of the frame (1). The telescopic rod of the first hydraulic cylinder (13) is downward and equipped with a suction cup (131). A swing assembly (5) for driving the first hydraulic cylinder (13) to swing is provided on the frame (1).

2. The sheet metal feeding machine according to claim 1, characterized in that: The swing assembly (5) includes a swing rod (51) fixedly connected to the upper side of the first hydraulic cylinder (13). The swing rod (51) is arranged along the width direction of the frame (1) and rotatably connected to the frame (1). One end of the swing rod (51) is sleeved and fixedly connected to a connecting rod (52) arranged along the length direction of the frame (1). The end of the connecting rod (52) away from the swing rod (51) is provided with a rotating component (53) that drives the swing rod (51) to rotate around its own rotation axis.

3. The sheet metal feeding machine according to claim 2, characterized in that: The rotating component (53) includes a drive rod (531) hinged to one end of the connecting rod (52) away from the swing rod (51). The drive rod (531) is inclined downwards and away from the swing rod (51). The end of the drive rod (531) away from the connecting rod (52) is hinged to a second hydraulic cylinder (533) fixedly connected to the side wall of the frame (1).

4. The sheet metal feeding machine according to claim 3, characterized in that: The workbench (2) is provided with a support plate (3) on the upper side to support the stacked iron sheets. The lifting assembly (4) includes a hinge rod (41) that corresponds one-to-one with the support plate (3) and the workbench (2) and is hinged to the same end on the same side of the support plate (3) and the workbench (2). The hinge rods (41) are arranged crosswise and hinged in the middle. The end of the hinge rod (41) that is hinged to the support plate (3) away from its own hinge end is equipped with a third hydraulic cylinder (42) to drive the end of the hinge rod (41) to slide. The support plate (3) and the workbench (2) have the same structure on the other side.

5. A sheet metal feeding machine according to claim 4, characterized in that: The frame (1) has multiple air knives (12) arranged circumferentially along the stacked iron sheets and parallel to the height direction of the frame (1) on the lower side near the workbench (2). The air knives (12) are all facing the iron sheets and can spray air onto the stacked iron sheets.

6. The sheet metal feeding machine according to claim 5, characterized in that: The workbench (2) includes a workbench body (21) and a sliding plate (22) slidably connected to the upper side of the workbench body (21). The sliding direction of the sliding plate (22) is perpendicular to the length direction of the frame (1). The support plate (3) and the hinge rod (41) are both installed on the sliding plate (22). A lead screw (23) that is threadedly connected to the sliding plate (22) is rotatably connected to the workbench body (21).

7. A sheet metal feeding machine according to claim 6, characterized in that: The support plate (3) has a mounting platform (31) for placing stacked iron sheets in the middle of its upper side. The support plate (3) has multiple limiting plates (6) arranged around the mounting platform (31). Each limiting plate (6) has a sliding rod (61) fixedly connected to its lower side, which is inserted into the limiting plate (6) and slidably connected to the limiting plate (6). A spring (62) is installed between the lower end of the sliding rod (61) and the support plate (3). The limiting plate (6) moves towards or away from the mounting platform (31) at the same time. The support plate (3) has a driving component (7) for driving the limiting plate (6) to move.

8. A sheet metal feeding machine according to claim 7, characterized in that: The driving component (7) includes a disk (71) located on the upper side of the support plate (3) and rotatably connected to the support plate (3). The rotation axis of the disk (71) coincides with the center line of the support plate (3). Each disk (71) is fixedly connected with a driving block (73) corresponding to the sliding rod (61). The width of the driving block (73) gradually decreases towards the side away from the center of the disk (71). The sliding rod (61) abuts against the side wall of the corresponding driving block (73). The support plate (3) is provided with a first motor (72) that drives the disk (71) to rotate.

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