Automatic stamping device for sheet metal

Abstract

The application discloses an automatic stamping device for hardware plates, and belongs to the field of stamping equipment.The automatic stamping device comprises an upper conveying unit and a lower conveying unit with the same conveying direction, the upper conveying unit is arranged above the lower conveying unit, a feeding unit is arranged on one side of the feeding end of the lower conveying unit, and a feeding unit is arranged on one side of the discharging end; the upper conveying unit and the lower conveying unit are both provided with a conveying part and at least one oiling roller, the lower conveying unit comprises a lower mounting part, an oil tank is arranged on the lower mounting part, the oil in the oil tank can be driven by the feeding unit in linkage, and is sprayed to the oiling roller of the lower conveying unit through a lower nozzle; the upper conveying unit comprises an upper oil tank, the oil in the upper oil tank can be driven by the feeding unit in linkage, and is sprayed to the oiling roller of the upper conveying unit through an upper nozzle. The automatic stamping device for hardware plates can realize automatic and uniform oiling of the upper and lower surfaces of the hardware plates, and reduces the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of stamping equipment, specifically to an automatic stamping device for metal sheets. Background Technology

[0002] In the automated stamping process of metal sheets, insufficient lubrication can easily lead to defects such as scratches on the sheet surface, while also aggravating mold wear, reducing mold life, and affecting product processing quality. Therefore, it is necessary to pre-apply lubricating oil evenly to the upper and lower surfaces of the sheet to reduce the frictional resistance between the sheet and the stamping mold, avoid scratches on the sheet surface, and improve the forming quality of the workpiece and the service life of the mold.

[0003] The existing methods of painting boards are mostly done manually by brushing or spraying, which has problems such as high labor intensity, uneven painting, and serious waste of oil. Summary of the Invention

[0004] The purpose of this invention is to address the above problems by providing an automatic stamping device for metal sheets, which can automatically and uniformly apply oil to the upper and lower surfaces of the metal sheets, thereby reducing labor intensity.

[0005] To achieve the above objectives, the technical solution adopted in this application is: an automatic stamping device for metal sheets, comprising an upper conveying unit and a lower conveying unit with the same conveying direction, wherein the upper conveying unit is disposed above the lower conveying unit; a feeding unit is disposed on the feeding end side of the lower conveying unit, and a feeding unit is disposed on the discharging end side; both the upper and lower conveying units are provided with a conveying part and at least one oiling roller; the lower conveying unit includes a lower mounting part, on which a lower oil tank is disposed, and the oiling roller and the conveying part on the lower conveying unit are both located above the lower oil tank; the oil in the lower oil tank can be driven by the feeding unit and sprayed onto the oiling roller of the lower conveying unit through a lower nozzle; the upper conveying unit includes an upper oil tank, and the oil in the upper oil tank can be driven by the feeding unit and sprayed onto the oiling roller of the upper conveying unit through an upper nozzle. The feeding unit pushes the sheet metal to the feed end of the lower conveyor unit, simultaneously driving the oil in the lower oil tank to spray oil onto the coating roller of the lower conveyor unit through the lower nozzle, keeping the coating roller constantly wet. After the sheet metal enters between the upper and lower conveyor units, the upper and lower coating rollers evenly coat the lower and upper surfaces of the sheet metal, respectively. The sheet metal is then conveyed by the conveyor section to the discharge end of the upper and lower conveyor units. The feeding unit then delivers the oiled sheet metal to the stamping station. During this process, the feeding unit simultaneously drives the oil in the upper oil tank to spray oil onto the coating roller of the upper conveyor unit through the upper nozzle, ensuring a continuous supply of oil to the upper coating roller. The entire oiling process is driven by the movement of the feeding and feeding units themselves, eliminating the need for an additional oil pump or motor.

[0006] Furthermore, the lower oil tank is connected to the oil storage tank via a lower connecting channel. The oil storage tank contains a lower piston with an inner diameter adapted to its own. The lower piston is fixedly connected to a lower pull rod, which extends out of the oil storage tank and forms a transmission connection with the feeding unit. The inlet of the lower nozzle is connected to the inside of the oil storage tank. Both the lower connecting channel and the lower nozzle are equipped with directional control devices. When the feeding unit operates, it drives the lower pull rod to reciprocate, thereby driving the lower piston in the oil storage tank to reciprocate. During the suction stroke of the lower piston, a negative pressure is generated in the oil storage tank. At this time, the directional control device on the lower connecting channel is activated, and the directional control device on the lower nozzle is deactivated, allowing oil in the lower oil tank to be drawn into the oil storage tank through the lower connecting channel. During the depressurization stroke of the lower piston, the pressure in the oil storage tank increases. At this time, the directional control device on the lower connecting channel is deactivated, and the directional control device on the lower nozzle is activated, allowing oil in the oil storage tank to be sprayed onto the oiling roller of the lower conveying unit under pressure, thus completing the oil supply and lubrication of the oiling roller of the lower conveying unit. In this way, each time the feeding unit completes a feeding action, it simultaneously performs a quantitative oil spraying to the coating roller of the lower conveyor unit, achieving structural integration and linkage between the feeding action and the oil supply action of the coating roller of the lower conveyor unit. This process eliminates the need for power and control components such as oil pumps, motors, or solenoid valves, effectively reducing equipment manufacturing and subsequent maintenance costs. The directional control device installed at the lower connecting channel and the lower nozzle can constrain the direction of oil flow, effectively preventing oil backflow and pressure leakage, ensuring stable oil supply, and ensuring that oil spraying and replenishment can be stably completed in each feeding process, keeping the coating roller continuously moist.

[0007] Furthermore, the feeding unit includes a storage shell and a pusher plate. The boards are stacked inside the storage shell. A discharge port is provided on the side wall of the storage shell facing the lower conveying unit. The pusher plate is positioned opposite the discharge port and can reciprocate along the line connecting it to the discharge port. The pusher plate is connected to a pusher frame, and the lower pull rod is detachably connected to the pusher frame. During operation, multiple boards are stacked inside the storage shell, with the board closest to the discharge port (i.e., the bottommost board) corresponding to the discharge port position. Driven by the pusher frame, the pusher plate moves towards the discharge port, pushing the bottommost board out of the discharge port and into the feed end of the lower conveying unit, completing one feeding action. After the pusher plate resets, the remaining boards in the storage shell automatically fall under gravity, ready for the next push. Through the cooperation of the storage shell, pusher plate, and discharge port, the stacked boards can be automatically pushed to the lower conveying unit piece by piece, replacing manual handling, reducing labor intensity, and improving feeding efficiency. During the aforementioned feeding process, as the push plate moves forward, it drives the detachably connected lower pull rod to move synchronously via the push frame, thereby driving the lower piston to work and complete the oil spraying and replenishment of the lower oiling roller. The lower pull rod and the push frame are detachably connected, which facilitates disassembly and replacement according to the specifications of the sheet material or equipment maintenance needs. At the same time, it is possible to decide whether to drive the lower piston to move as needed.

[0008] Furthermore, a baffle plate is provided on the side wall of the storage shell at the discharge port. The installation height of the baffle plate can be adjusted along the height direction of the discharge port. The baffle plate acts as a barrier to prevent multiple plates from being pushed out simultaneously, thereby reducing the production accident rate. At the same time, the installation height of the baffle plate can be adjusted along the height direction of the discharge port through elongated holes, fasteners, screw adjustment mechanisms, etc., thereby changing the gap between the lower edge of the baffle plate and the lower edge of the discharge port to accommodate plates of different thicknesses.

[0009] Furthermore, the upper surface of the lower oil tank is provided with an oil return port communicating with its interior, and the upper surface of the lower oil tank is configured as a guide surface that slopes downward toward the oil return port. During operation, the oil on the roller surface and the plate drips onto the upper surface of the lower oil tank under the action of gravity, and then automatically flows along the inclined guide surface to the oil return port, and flows back into the lower oil tank through the oil return port, realizing the gravity-flow recovery of oil, thereby effectively improving the utilization rate of lubricating oil and reducing oil consumption.

[0010] Furthermore, the upper oil tank is connected to the oil storage chamber within the support via an upper connecting channel. An upper piston with a diameter matching the oil storage chamber is installed inside the oil storage chamber. The upper piston is connected to an upper pull rod, which extends out of the oil storage chamber and is connected to the feeding unit via a transmission connection. The inlet of the upper nozzle is connected to the inside of the oil storage chamber. Both the upper connecting channel and the upper nozzle are equipped with directional control devices. When the feeding unit operates, it drives the upper pull rod to reciprocate, thereby driving the upper piston in the oil storage chamber to reciprocate. During the suction stroke of the upper piston, a negative pressure is generated in the oil storage chamber. At this time, the directional control device on the upper connecting channel is activated, and the directional control device on the upper nozzle is deactivated, allowing oil from the upper oil tank to be drawn into the oil storage chamber via the upper connecting channel. During the depressurization stroke of the upper piston, the pressure in the oil storage chamber increases. At this time, the directional control device on the upper connecting channel is deactivated, and the directional control device on the upper nozzle is activated, allowing oil from the oil storage chamber to be sprayed onto the oiling roller of the upper conveying unit under pressure, thus completing the oil supply and lubrication of the oiling roller of the upper conveying unit. In this way, each feeding unit completes a feeding action, simultaneously spraying a fixed amount of oil onto the coating roller of the upper conveyor unit, achieving a structurally integrated linkage between the feeding action and the oil supply action of the coating roller. This process eliminates the need for power and control components such as oil pumps, motors, or solenoid valves, effectively reducing equipment manufacturing and subsequent maintenance costs. The directional control device located at the upper connecting channel and the upper nozzle constrains the direction of oil flow, effectively preventing backflow and pressure leakage, ensuring stable oil supply, and guaranteeing stable oil spraying and replenishment during each feeding process, keeping the coating roller continuously moist.

[0011] A mounting base is provided below the support. The conveying part of the upper conveying unit and the oiling roller are mounted on the mounting base. The height of the mounting base can be adjusted vertically. By adjusting the vertical height of the mounting base, the vertical distance between the upper and lower conveying units can be changed, ensuring that the upper and lower oiling rollers maintain appropriate contact pressure with the surface of the plate, ensuring the oiling effect, and expanding the applicability of the device.

[0012] Furthermore, the feeding unit includes a support that moves laterally and a carrying unit. The support is positioned above the carrying unit. The carrying unit includes conveying rollers spaced apart along the conveying direction of the lower conveying unit. A carrying plate that can move vertically is arranged between the conveying rollers. The carrying plate has a low position below the upper surface of the conveying rollers and a high position above the upper surface of the conveying rollers during its lifting stroke. The support is provided with a lifting part that can move vertically. A plate picking unit is provided on the lower surface of the lifting part. The upper pull rod is detachably connected to the support for disassembly, maintenance, and component replacement. It can also flexibly select whether to link with oil supply according to production conditions, making it more flexible.

[0013] During operation, the oiled sheet material is conveyed from the lower conveyor unit to the feeding unit, where it rests on the conveyor rollers. Then, both the upper and lower conveyor units stop working. Initially, the carrying plate is in a low position, its height below the upper surface of the conveyor rollers, thus not obstructing the sheet material's movement along the rollers. Once the sheet material reaches the predetermined position, the carrying plate moves upward to a high position, lifting the sheet material from the conveyor rollers. Subsequently, the support moves directly above the sheet material, and the lifting unit moves downward, causing the sheet material picking unit (e.g., a vacuum suction cup or electromagnet) to contact and grasp the sheet material. The lifting unit returns to its original position, lifting the sheet material, and the support continues to move laterally, transporting the sheet material to the stamping station. The automatic grasping and transfer of the sheet material is achieved through the lifting unit and the sheet material picking unit, increasing the automation level of the equipment, reducing manual intervention, and lowering labor intensity.

[0014] Furthermore, the upper pull rod is magnetically connected to the bracket. When the bracket moves laterally, the magnetic attraction drives the upper pull rod to move synchronously, thereby driving the upper piston to move and complete the fuel injection and replenishment action. When it is necessary to disconnect the linkage, if the upper piston contacts the end face of the oil storage chamber, the upper pull rod can be separated from the bracket, cutting off the power transmission.

[0015] Furthermore, the support is provided with horizontal frames at intervals, and each horizontal frame is equipped with a clamping and limiting plate that can automatically return to an inclined state. The upper surface of the clamping and limiting plate is higher than the upper surface of the horizontal frames, and the clamping and limiting plate is located on the path of the lifting part moving downward. When the lifting part moves downward and contacts the clamping and limiting plate, it pushes the clamping and limiting plate to rotate around its hinge axis towards the plate side, so that its lower end turns to a vertical state. During the rotation, the clamping and limiting plate pushes the plate on the carrier plate to move, thereby ensuring that the position of the plate on the carrier plate remains consistent. At the same time, multiple clamping and limiting plates distributed around the plate together form a limiting frame, which restricts the range of motion of the plate in the horizontal direction and downward movement from the periphery of the plate, guiding the plate to fall accurately into the predetermined position of the mold cavity, ensuring that the plate can be stably placed in the correct position of the mold each time, improving the positioning accuracy and product consistency of the automated stamping production line. When the lifting part returns to its upward position, the clamping and limiting plate automatically returns to its initial inclined state under the action of a return spring or torsion spring, waiting for the next action.

[0016] Furthermore, the transverse frame can be adjusted laterally. The operator can move the transverse frame to a suitable position according to the actual outer diameter of the sheet material, and then lock it in place, thus matching the spacing between the paired clamping and limiting plates to the outer diameter of the sheet material. The clamping and limiting plate includes an adjusting plate. The installation height of the adjusting plate can be adjusted to change the contact point height between the clamping and limiting plate and the edge of the sheet material, adapting to the limiting requirements of sheets of different thicknesses. Simultaneously, by adjusting the height of the adjusting plate, the lower end face of the adjusting plate is moved as low as possible to be closer to the mold surface while avoiding collision with the mold. This ensures that when switching between different molds, the lower end face of the adjusting plate will not impact the mold, and the guiding distance of the sheet material from release to falling into the mold is minimized, thereby improving the positioning effect.

[0017] The beneficial effects of this application are as follows: By cooperating with the upper and lower oiling rollers and the nozzle, continuous and uniform oiling of the upper and lower surfaces of the board can be achieved, effectively avoiding problems such as uneven oiling and high labor intensity caused by manual brushing or spraying; at the same time, by spraying oil quantitatively onto the oiling rollers through the nozzle, oil waste can be significantly reduced, and the oiling action is driven by the linkage of the feeding unit and the material feeding unit, eliminating the need for a separate oil pump, motor or solenoid valve, effectively reducing equipment manufacturing costs and energy consumption. Attached Figure Description

[0018] Figure 1 This is a side view of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the front view structure of the upper transmission unit.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the support.

[0021] The text labels in the diagram represent: 1. Upper conveying unit; 2. Lower conveying unit; 3. Conveying section; 4. Oiling roller; 5. Lower mounting section; 6. Lower oil tank; 7. Lower nozzle; 8. Upper oil tank; 9. Upper nozzle; 10. Lower connecting channel; 11. Oil storage tank; 12. Lower piston; 13. Lower pull rod; 14. Storage shell; 141. Discharge port; 15. Push plate; 16. Plate; 17. Push frame; 18. Baffle plate; 19. Oil return port; 20. Connecting channel; 21. Support; 22. Oil storage chamber; 23. Upper piston; 24. Upper pull rod; 25. Mounting seat; 26. Bracket; 27. Conveying roller; 28. Carrying plate; 29. ​​Lifting section; 30. Plate picking unit; 31. Horizontal frame; 32. Clamping and limiting plate; 33. Adjusting plate; 34. Horizontal plate. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this application, the application will be described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory, and should not be used to limit the scope of protection of this application.

[0023] Example 1, as Figures 1-3 As shown, the specific structure of this embodiment is an automatic stamping device for metal sheets, including an upper conveying unit 1 and a lower conveying unit 2 with the same conveying direction. The upper conveying unit 1 is disposed above the lower conveying unit 2. The lower conveying unit 2 has a feeding unit on its inlet side and a feeding unit on its outlet side.

[0024] Both the upper conveying unit 1 and the lower conveying unit 2 are equipped with a conveying section 3 and at least one oiling roller 4. In this embodiment, the conveying section 3 is preferably a conveyor belt or spaced rollers, and the conveying section 3 operates actively to move the sheet material along the conveying direction. The oiling roller 4 is a rotatable cylindrical roller body, and its surface is covered with an oil-absorbing material (such as felt or oil-absorbing cotton) to evenly coat the lubricating oil onto the surface of the sheet material.

[0025] The lower conveying unit 2 includes a lower mounting part 5, which is a shell structure with an open upper end but closed side walls. A lower oil tank 6 is provided on the lower mounting part 5, and the upper surface of the lower oil tank 6 is lower than the upper surface of the lower mounting part 5. The oiling roller 4 and the conveying part 3 on the lower conveying unit 2 are both located above the lower oil tank 6, and the upper surfaces of the oiling roller 4 and the conveying part 3 on the lower conveying unit 2 are higher than the upper surface of the lower mounting part 5. The lower oil tank 6 is connected to the oil storage tank 11 through a lower connecting channel 10. A lower piston 12 adapted to its inner diameter is provided inside the oil storage tank 11. The lower piston 12 is fixedly connected to a lower pull rod 13, and the lower piston 12 can slide back and forth along the axis of the oil storage tank 11 in a sealed manner. For this purpose, the lower pull rod 13 extends out of the oil storage tank 11 to form a transmission connection with the feeding unit. A shaft seal is provided at the connection between the lower pull rod 13 and the side wall of the oil storage tank 11 to ensure the sealing of the oil storage tank 11. The inlet of the lower nozzle 7 is connected to the inside of the oil storage tank 11. The number of oiling rollers 4 on the lower conveying unit 2, the oil storage tank 11, and the lower nozzle 7 are matched, that is, one oiling roller 4 on the lower conveying unit 2 corresponds to one oil storage tank 11 and one lower nozzle 7. The lower nozzle 7 and the lower connecting channel 10 are located on the same side of the length direction of the oil storage tank 11, that is, the side away from the feeding unit. The lower connecting channel 10 and the lower nozzle 7 are each equipped with an independent directional control device. The directional control device can be a one-way valve or other device that can control the direction of the fluid. In this embodiment, the directional control device in the lower connecting channel 10 can be a one-way valve, and the directional control device on the lower nozzle 7 can be a duckbill valve installed at its outlet. The one-way valve on the lower connecting channel 10 only allows oil to flow from the lower oil tank 6 to the oil storage tank 11, and the directional control device on the lower nozzle 7 only allows oil to flow from the oil storage tank 11 to the outlet of the lower nozzle 7. The upper surface of the lower oil tank 6 is provided with an oil return port 19 communicating with its interior, and the upper surface of the lower oil tank 6 is configured as a guide surface that is lowered toward the oil return port 19.

[0026] The upper conveying unit 1 comprises, from top to bottom, an upper oil tank 8, a support 21, and a mounting base 25. The upper oil tank 8 is connected to the oil storage chamber 22 within the support 21 via an upper connecting channel 20. An upper piston 23, matching the inner diameter of the oil storage chamber 22, is installed within the oil storage chamber 22. The upper piston 23 is fixedly connected to an upper pull rod 24 and can reciprocate along the sealed oil storage chamber 22. For this purpose, the upper pull rod 24 extends out of the oil storage chamber 22 and is connected to the feeding unit via a transmission mechanism. A shaft seal is provided at the connection between the upper pull rod 24 and the side wall of the oil storage chamber 22 to ensure the sealing of the oil storage chamber 22. The inlet of the upper nozzle 9 is connected to the inside of the oil storage chamber 22. The number of oiling rollers 4 on the upper conveying unit 1, the oil storage chamber 22, and the upper nozzles 9 are matched, that is, one oiling roller 4 on the upper conveying unit 1 corresponds to one oil storage chamber 22 and one upper nozzle 9. The upper nozzle 9 and the upper connecting channel 20 are located on the same side of the length direction of the oil storage chamber 22, that is, the side away from the feeding unit. Both the upper connecting channel 20 and the upper nozzle 9 are equipped with directional control devices. In this embodiment, the directional control device in the upper connecting channel 20 can be a one-way valve, and the directional control device on the upper nozzle 9 can be a duckbill valve installed at its outlet. The one-way valve on the upper connecting channel 20 only allows oil to flow from the upper oil tank 8 to the oil storage chamber 22, and the directional control device on the upper nozzle 9 only allows oil to flow from the oil storage chamber 22 to the outlet of the upper nozzle 9. The conveying part 3 and the oiling roller 4 on the upper conveying unit 1 are mounted on the mounting base 25, and the lower surfaces of the conveying part 3 and the oiling roller 4 on the upper conveying unit 1 protrude from the lower surface of the mounting base 25. The height of the mounting base 25 can be adjusted vertically. For this purpose, the cylinder of a linear drive mechanism such as a linear module can be mounted on the fixed support 21. The piston rod of the linear drive mechanism is fixedly connected to the mounting base 25. Alternatively, a motor can be mounted on the support 21, and a lead screw can be mounted on the output shaft of the motor. The lead screw is threadedly connected to the mounting base 25. Other mechanisms that can drive components to lift can also be used.

[0027] The feeding unit includes a storage shell 14 and a pusher plate 15. Plates 16 are stacked inside the storage shell 14. The storage shell 14 is open at the top or has an openable door on its side wall for easy replenishment. In this embodiment, the plate 16 to be processed is rectangular. A through-type discharge port 141 is provided on the side wall of the storage shell 14 facing the lower conveying unit 2. A baffle plate 18 is provided on the side wall of the storage shell 14 at the discharge port 141. The installation height of the baffle plate 18 can be adjusted along the height direction of the discharge port 141. For this purpose, multiple threaded holes can be arranged vertically at intervals on the outer side wall of the storage shell 14, and through holes can be provided on the baffle plate 18. The height is fixed by aligning the through holes with different threaded holes and then locking the baffle plate 18 with bolts through the through holes; alternatively, elongated holes can be provided on the baffle plate 18, and the height can be fixed by adjusting the position of the baffle plate 18 and then locking it. The push plate 15 is horizontally opposite to the discharge port 141. Initially, the push plate 15 is located at the far end of the lower conveying unit 2, and it can reciprocate along the line connecting it to the discharge port 141. To drive the push plate 15, it is connected to the push frame 17, which moves under the drive of a cylinder, linear module, etc. The lower pull rod 13 is detachably connected to the push frame 17 via bolts or snap-fit ​​connections.

[0028] The feeding unit includes a support 26 that can move laterally and a carrying unit. The support 26 is positioned above the carrying unit. The carrying unit includes multiple conveying rollers 27 spaced apart along the conveying direction of the lower conveying unit 2. The upper surface of the conveying rollers 27 is not higher than the upper surface of the conveying section 3 on the lower conveying unit 2. The conveying rollers 27 rotate under the drive of a motor or the like, and the conveying rollers 27 and the conveying section 3 are driven independently. A carrying plate 28 is provided between the conveying rollers 27. The outer diameter of the carrying plate 28 is smaller than the outer diameter of the material. The carrying plate 28 can move vertically under the drive of a cylinder or the like. The carrying plate 28 has a low position below the upper surface of the conveying rollers 27 and a high position above the upper surface of the conveying rollers 27 during its lifting stroke. The purpose of providing the carrying plate 28 is to prevent the conveying rollers 27 from interfering with the rotation of the clamping and limiting plate 32. The bracket 26 is equipped with a vertical pushing mechanism such as a cylinder. A pushing plate is fixedly mounted on the piston rod of the vertical pushing mechanism. The lower surface of the pushing plate is connected to the lifting part 29 via a telescopic mechanism such as a spring. The lower surface of the lifting part 29 is equipped with a plate picking unit 30, which can be a vacuum suction cup or an electromagnet. The upper pull rod 24 is detachably connected to the bracket 26, for example, by bolts. In this embodiment, the upper pull rod 24 and the bracket 26 are magnetically connected (for example, a permanent magnet is provided at the end of the upper pull rod 24, and a magnetic conductor or permanent magnet is provided at the corresponding position on the bracket 26).

[0029] The support 26 is provided with multiple horizontal frames 31 at intervals. In this embodiment, four horizontal frames 31 are provided, corresponding to the four sides of the plate 16. A clamping and limiting plate 32 is rotatably mounted on each horizontal frame 31. The clamping and limiting plate 32 can automatically return to an inclined state (e.g., through a torsion spring or spring hinge), and its lower end extends outward from the support 26. The upper surface of the clamping and limiting plate 32 is higher than the upper surface of the horizontal frame 31, and the clamping and limiting plate 32 is located on the downward movement path of the lifting part 29. To increase the contact area between the clamping and limiting plate 32 and the lifting part 29, a horizontal plate 34 is provided on the upper surface of the clamping and limiting plate 32. The angle between the horizontal plate 34 and the clamping and limiting plate 32 is ninety degrees. When the lower end of the clamping and limiting plate 32 rotates toward the side where the plate is located, it can become vertical. The transverse frame 31 can be adjusted laterally. For this purpose, a screw is threaded onto the bracket 26, with one end rotatably connected to the transverse frame 31 and the other end extending out of the bracket 26 and connected to a handle. The position of the transverse frame 31 is adjusted by rotating the screw. Alternatively, a linear module can be installed on the bracket 26 to drive the transverse frame 31 to move. The clamping and limiting plate 32 includes an adjusting plate 33. The installation height of the adjusting plate 33 can be adjusted. For example, the adjusting plate 33 can have elongated holes, and the clamping and limiting plate 32 can have threaded holes. By moving the position of the adjusting plate 33 and then fixing it with bolts, the contact point height between the clamping and limiting plate 32 and the edge of the material can be changed. This also ensures that the lower end face of the adjusting plate 33 is as close as possible to the mold surface while avoiding collision with the mold.

[0030] The specific working process is as follows: Sheets are pre-stacked in the storage shell 14, with the sheet closest to the discharge port 141 (i.e., the bottommost sheet) corresponding to the discharge port position. During stamping, the pusher plate 15, driven by the pusher frame 17, moves towards the discharge port 141, pushing the bottom sheet 16 out of the discharge port and into the feed end of the lower conveyor unit 2, completing one feeding action. After the pusher plate 15 returns to its original position with the pusher frame 17, the remaining sheet 16 in the storage shell 14 automatically falls under gravity, ready for the next push. A gap is formed between the lower edge of the baffle plate 18 and the lower edge of the discharge port 141, allowing only a single sheet to pass through. During the pushing process, the baffle plate 18 blocks the sheet above, preventing multiple sheets from being pushed out simultaneously.

[0031] As the push plate 15 moves forward (towards the lower conveyor unit 2), it drives the lower pull rod 13 to move synchronously via the push frame 17. The lower pull rod 13 pulls the lower piston 12 to reciprocate within the oil tank 11: when the lower piston 12 moves away from the lower connecting channel 10 (suction stroke), a negative pressure is generated in the oil tank 11, the one-way valve on the lower connecting channel 10 opens, and the one-way valve on the lower nozzle 7 closes, allowing oil in the lower oil tank 6 to be drawn into the oil tank 11 through the lower connecting channel 10; when the lower piston 12 moves closer to the lower connecting channel 10 (pressure stroke), the pressure in the oil tank 11 increases, the one-way valve on the lower connecting channel 10 closes, and the one-way valve on the lower nozzle 7 opens, allowing oil in the oil tank 11 to be sprayed onto the oiling roller 4 of the lower conveyor unit 2 under pressure, keeping it moist. When oil spraying is not needed, the connection between the lower pull rod 13 and the push frame 17 can be disconnected. Before starting the lower conveyor unit 2, the oil pump in the lower oil tank 6 can spray oil onto the oiling roller 4 of the lower conveyor unit 2 to wet it. Then, the oil pump is turned off, and the lower piston 12 keeps the oiling roller 4 of the lower conveyor unit 2 wet.

[0032] After the sheet material enters between the upper conveying unit 1 and the lower conveying unit 2, the upper and lower oiling rollers 4 apply oil evenly to the lower and upper surfaces of the sheet material, respectively. The conveying unit 3 moves the sheet material forward along the conveying direction. During the oiling process, excess oil on the oiling rollers 4 and the sheet material, as well as oil sprayed from the upper nozzle 9, drips onto the upper surface of the lower oil tank 6 under gravity. It then automatically flows along the inclined guide surface to the oil return port 19 and returns to the lower oil tank 6, thus achieving oil recycling.

[0033] After being coated with oil, the sheet material is conveyed via the conveyor section 3 of the lower conveyor unit 2 to the conveyor roller 27 of the feeding unit. When the sheet material 16 moves onto the conveyor roller 27, the upper conveyor unit 1 and the lower conveyor unit 2 stop working, causing the sheet material on the conveyor roller 27 to be separated from the sheet material on the lower conveyor unit 2. The position of the sheet material can be detected by proximity switches, photoelectric sensors, etc. Initially, the carrier plate 28 is in a low position, its height is lower than the upper surface of the conveyor roller 27, and it does not obstruct the movement of the sheet material along the conveyor roller 27. When the sheet material reaches the predetermined position, the carrier plate 28 moves upward to switch to a high position, lifting the sheet material off the conveyor roller 27. Subsequently, the bracket 26 moves laterally to directly above the sheet material, and then the lifting section 29 moves downward. As the lifting part 29 moves downward, its lower surface contacts and presses down on the clamping and limiting plate 32, forcing the clamping and limiting plate 32 to rotate around the hinge axis, making its lower end vertical. During this process, the side wall of the clamping and limiting plate 32 pushes the side wall of the plate 16, causing the plate 16 to move coaxially within the area enclosed by the clamping and limiting plate 32. The clamping and limiting plates 32 distributed around the plate together form a limiting frame, restricting the range of motion of the plate in the horizontal direction and downward movement from the periphery of the plate. As the lifting part 29 continues to descend, after the plate picking unit 30 picks up the plate, the bracket 26 moves laterally, transporting the plate above the stamping die. During this process, the upper pull rod 24, which is magnetically connected to the bracket 26, is driven to move synchronously, thereby driving the upper piston 23 to reciprocate within the oil storage chamber 22. During the suction stroke, the one-way valve on the upper connecting channel 20 opens, the directional control device on the upper nozzle 9 closes, and the oil in the upper oil tank 8 is drawn into the oil storage chamber 22 through the upper connecting channel 20. During the pressure stroke, the one-way valve on the upper connecting channel 20 closes, the directional control device on the upper nozzle 9 opens, and the oil in the oil storage chamber 22 is sprayed onto the oiling roller 4 of the upper conveying unit 1 through the upper nozzle 9, keeping it moist. When it is necessary to stop supplying oil to the oiling roller of the upper conveying unit 1, the upper pull rod 24 can be shortened, so that the bracket 26 cannot be connected to the upper pull rod 24. At this time, the movement of the bracket 26 no longer drives the upper pull rod 24, and the oil spraying action is paused. When it is necessary to resume, the two can be re-engaged. Before starting the upper conveyor unit 1, the oil pump in the upper oil tank 8 can spray oil onto the oiling roller 4 of the upper conveyor unit 1 to wet it. Then, the oil pump is turned off, and the upper piston 23 keeps the oiling roller 4 of the lower conveyor unit 2 wet. Through magnetic connection, the distance that the bracket 26 moves toward the mold can be longer than the distance that the upper piston moves, thus allowing for flexible arrangement of the production line.

[0034] After the support 26 transports the sheet metal to the top of the stamping die, the sheet metal picking unit 30 releases the sheet metal to place it into the die cavity. Since the lower end face of the adjusting plate 33 has been pre-adjusted to a position close to the die surface without collision, and the clamping limit plate 32 is in a vertical state, the sheet metal is precisely guided from release to placement, ensuring that the sheet metal moves accurately onto the die. After the sheet metal is placed and the lifting part 29 returns to its original position, the clamping limit plate 32 automatically rotates under the action of a torsion spring or return spring, restoring its initial tilt state, and waits for the next limit operation. Then the support 26 moves away from the die and returns to its original position for stamping.

[0035] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An automatic stamping device for metal sheets, comprising an upper conveying unit (1) and a lower conveying unit (2) with the same conveying direction, wherein the upper conveying unit (1) is disposed above the lower conveying unit (2); characterized in that, The lower conveying unit (2) is provided with a feeding unit on one side of the feeding end and a feeding unit on one side of the discharging end; both the upper conveying unit (1) and the lower conveying unit (2) are provided with a conveying part (3) and at least one oiling roller (4); the lower conveying unit (2) includes a lower mounting part (5), and a lower oil tank (6) is provided on the lower mounting part (5); the oil in the lower oil tank (6) can be driven by the feeding unit and sprayed onto the oiling roller (4) of the lower conveying unit (2) through the lower nozzle (7); the upper conveying unit (1) includes an upper oil tank (8), and the oil in the upper oil tank (8) can be driven by the feeding unit and sprayed onto the oiling roller of the upper conveying unit (1) through the upper nozzle (9).

2. The automatic stamping device for metal sheets according to claim 1, characterized in that, The lower oil tank (6) is connected to the oil storage tank (11) through the lower connecting channel (10). The oil storage tank (11) is equipped with a lower piston (12) that matches its inner diameter. The lower piston (12) is fixedly connected to the lower pull rod (13). The lower pull rod (13) extends out of the oil storage tank (11) and forms a transmission connection with the feeding unit. The inlet of the lower nozzle (7) is connected to the inside of the oil storage tank (11). Both the lower connecting channel (10) and the lower nozzle (7) are equipped with directional control devices.

3. An automatic stamping device for metal sheets according to claim 2, characterized in that, The feeding unit includes a storage shell (14) and a pusher plate (15). The plates (16) are stacked in the storage shell (14). The storage shell (14) has a discharge port (141) on its side wall facing the lower conveying unit (2). The pusher plate (15) is arranged opposite to the discharge port (141) and the pusher plate (15) can reciprocate along the line connecting it and the discharge port (141). The pusher plate (15) is connected to the pusher frame (17). The lower pull rod (13) is detachably connected to the pusher frame (17).

4. An automatic stamping device for metal sheets according to claim 3, characterized in that, The storage shell (14) has a baffle plate (18) at the discharge port (141) on its side wall. The installation height of the baffle plate (18) can be adjusted along the height direction of the discharge port (141).

5. An automatic stamping device for metal sheets according to claim 1, characterized in that, The upper surface of the lower oil tank (6) is provided with an oil return port (19) communicating with its interior, and the upper surface of the lower oil tank (6) is configured as a guide surface that is lowered toward the oil return port (19).

6. An automatic stamping device for metal sheets according to claim 1, characterized in that, The upper oil tank (8) is connected to the oil storage chamber (22) in the support (21) through the upper connecting channel (20). The oil storage chamber (22) is provided with an upper piston (23) that matches its inner diameter. The upper piston (23) is connected to the upper pull rod (24). The upper pull rod (24) extends out of the oil storage chamber (22) and is connected to the feeding unit. The inlet of the upper nozzle (9) is connected to the inside of the oil storage chamber (22). Both the upper connecting channel (20) and the upper nozzle (9) are provided with directional control devices. A mounting base (25) is provided below the support (21). The conveying part (3) on the upper conveying unit (1) and the oiling roller (4) are provided on the mounting base (25). The height of the mounting base (25) can be adjusted vertically.

7. An automatic stamping device for metal sheets according to claim 6, characterized in that, The feeding unit includes a support (26) that moves laterally and a carrying unit. The support (26) is located above the carrying unit. The carrying unit includes conveying rollers (27) spaced apart along the conveying direction of the lower conveying unit (2). A carrying plate (28) that can move vertically is provided between the conveying rollers (27). The carrying plate (28) has a low position below the upper surface of the conveying rollers (27) and a high position above the upper surface of the conveying rollers (27) in the lifting stroke. A lifting part (29) that can move vertically is provided on the support (26). A plate picking unit (30) is provided on the lower surface of the lifting part (29). The upper pull rod (24) is detachably connected to the support (26).

8. An automatic stamping device for metal sheets according to claim 7, characterized in that, The upper pull rod (24) and the bracket (26) are magnetically connected.

9. An automatic stamping device for metal sheets according to claim 7, characterized in that, The bracket (26) is provided with a horizontal frame (31) at intervals. The horizontal frame (31) is provided with a clamping limit plate (32) that can automatically reset to an inclined state. The upper surface of the clamping limit plate (32) is higher than the upper surface of the horizontal frame (31), and the clamping limit plate (32) is located on the path of the lifting part (29) moving downward.

10. An automatic stamping device for metal sheets according to claim 9, characterized in that, The horizontal frame (31) can be adjusted in position laterally, and the clamping limiting plate (32) includes an adjustment plate (33), the installation height of which can be adjusted.

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