An automatic stamping machine for the inner pot of a pressure cooker

Abstract

The present invention discloses an automatic stamping machine for the inner pot of a pressure cooker, which relates to the field of inner pot processing and includes a stamping upper die and a stamping lower die that play a role in stamping and forming a metal sheet. The position of the stamping lower die is fixed, and the stamping upper die is located directly above the stamping lower die. At least three straight notches are provided on the outer surface of the top of the stamping lower die and are evenly distributed at equal intervals in a circular pattern. A positioning unit is provided on one side of each straight notch away from the center of the stamping lower die. Through the action of the driving unit, the present invention can trigger the positioning unit when the stamping upper die moves downward and closes with the stamping lower die. Under the action of the positioning unit, it can ensure that the circular metal sheet is in the exact center position of the stamping lower die, thereby avoiding the situation where the edge of the stamped inner pot of the pressure cooker is missing or incomplete due to the deviation of the placement of the metal sheet. Moreover, when the stamping upper die returns to its original position, the formed inner pot of the pressure cooker can be automatically removed from the upper end surface of the stamping lower die through the blanking unit.

Description

Technical Field

[0001] The present invention relates to the field of inner pot processing, and specifically to an automatic stamping machine for the inner pot of a pressure cooker. Background Art

[0002] The inner pots of rice cookers or pressure cookers are all formed by stamping with a stamping machine. The stamping process is as follows: a circular metal sheet is placed at the port of the mold inside the stamping machine. Driven by the stamping machine, the upper die and the lower die squeeze the metal sheet to form a blank product of the inner pot of a rice cooker or a pressure cooker.

[0003] During the stamping process of the inner pot, the metal sheet is transferred to the port of the mold by a robotic arm. Since the port of the mold is also circular, the metal sheet needs to be placed concentrically with the port of the mold to ensure that the blank of the inner pot stamped out is complete. If the metal sheet is not placed concentrically with the port of the mold, the side edges of the product after stamping will be missing, resulting in defective products.

[0004] Although the accuracy of transferring the metal sheet by the robotic arm is very high, after long-term operation, its accuracy will decrease, resulting in errors in the position placement of the metal sheet. Coupled with the lack of centering assistance function between the port of the mold and the metal sheet, defective products that are not stamped correctly will be produced irregularly during the batch stamping process of the inner pot. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic stamping machine for the inner pot of a pressure cooker to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: an automatic stamping machine for the inner pot of a pressure cooker, including: a stamping upper die and a stamping lower die that play a role in stamping and forming the metal sheet. The position of the stamping lower die is fixed, and the stamping upper die is located directly above the stamping lower die. At least three straight notches are provided on the outer surface of the top of the stamping lower die and are evenly distributed at equal intervals in a circumferential manner. A centering unit is provided on one side of each straight notch away from the center of the stamping lower die. The centering unit is used to adjust the position of the metal sheet placed on the upper end surface of the stamping lower die. The stamping upper die can move up and down under the action of the stamping machine, and when it closes with the stamping lower die, it can stamp and form the metal sheet.

[0007] It further includes: a driving unit for driving at least three centering units to adjust the position of the metal sheet. The driving unit is arranged on the outer walls of the stamping upper die and the stamping lower die.

[0008] A blanking unit for pushing the stamped inner pot workpiece away from the upper end surface of the stamping lower die. The blanking unit is located outside the stamping upper die.

[0009] Preferably, the alignment unit includes a U-shaped frame fixedly installed on the outer wall of the lower stamping die, and the inner notch of the U-shaped frame coincides with the notch of the straight notch. A slider is slidably assembled at the inner bottom of the U-shaped frame, and at least two first sliding rods are axially slidably inserted into the slider. A push block is fixedly arranged between the tops of the two first sliding rods, and the push block is slidably assembled with the straight notch and the U-shaped frame. A first spring is sleeved on the outer surface of the first sliding rod, and both ends of the first spring are fixed to the push block and the slider respectively. A through groove is formed at the bottom of the U-shaped frame, and the bottom of the first sliding rod is placed inside the through groove. When the first spring is not compressed, a part of the push block is inside the U-shaped frame, and a part of it extends out of the top of the U-shaped frame.

[0010] Preferably, the driving unit includes a turntable rotatably sleeved on the outer surface of the lower stamping die, and the turntable is located below the U-shaped frame. An inclined groove is formed inside the turntable, and the number of the inclined grooves is the same as that of the U-shaped frames. A second sliding rod is fixedly arranged at the bottom of each slider, and the second sliding rod simultaneously slides through the through groove and the inclined groove. A transmission component is arranged outside the turntable. When the turntable deflects, due to the simultaneous limitation of the through groove and the inclined groove on the second sliding rod, the second sliding rod can drive the slider to move towards the center of the lower stamping die.

[0011] Preferably, the transmission component includes a mounting plate fixedly installed on the side wall of the lower stamping die, and a sleeve is rotatably sleeved inside the mounting plate. A toothed disc is sleeved on the outer surface of the sleeve. A plurality of tooth grooves are formed on the outer surface of the turntable, and the toothed disc is movably engaged with the tooth grooves. A smooth shaft is slidably inserted into the sleeve, and a spiral groove is formed on the outer surface of the smooth shaft. A sliding column fixedly arranged on the inner wall of the sleeve is movably fitted with the spiral groove. The top of the smooth shaft is fixed to the outer wall of the upper stamping die. A clamping component is also arranged between the sleeve and the toothed disc. When the smooth shaft moves downward, due to the engagement of the sliding column and the spiral groove, the sleeve can rotate inside the mounting plate.

[0012] Preferably, the toothed disc is rotatably sleeved on the outer wall of the sleeve. A plurality of positioning arc grooves are formed on the outer surface of the sleeve at equal circumferential intervals. At least two sliding discs are radially distributed and slidably fitted inside the toothed disc. A second spring is arranged between the end face of the sliding disc away from the sleeve and the toothed disc. A round head pin slidably penetrating through the toothed disc is fixedly arranged on the end face of the sliding disc close to the sleeve, and the round head end of the round head pin is movably fitted with the positioning arc groove. When a large rotational force is generated between the sleeve and the toothed disc, the round head end of the round head pin will disengage from the inside of the positioning arc groove.

[0013] Preferably, one end of the chute is close to the center of the stamping lower die, and the other end is far from the center of the stamping lower die, that is, the chute can push the second slide bar to move.

[0014] Preferably, the volume of the dome pin embedded inside the positioning arc groove is less than the total volume of the dome port of the dome pin, so as to facilitate the positioning arc groove to apply a thrust force to the dome pin.

[0015] Preferably, the blanking unit includes columns distributed on the side of the optical axis away from the stamping lower die, and the tops of the columns are fixed to the top of the optical axis. An activity frame is placed around the optical axis and the columns. A fixed frame is also fixedly arranged on the outer surface of the stamping lower die, and the columns are axially slidably inserted between the fixed frames. At least one holding rod is fixedly arranged on the end face of the fixed frame away from the optical axis, and the end of the holding rod away from the optical axis axially slides through the activity frame. A third spring is sleeved outside the holding rod, and both ends of the third spring are fixed to the activity frame and the fixed frame respectively. A moving component is also arranged between the column and the activity frame. Each time the stamping upper die and the stamping lower die are separated and move upward, the activity frame can be moved between the stamping upper die and the stamping lower die.

[0016] Preferably, the moving component includes a rotating shaft rotatably assembled inside the fixed frame, and the rotating shaft is vertically distributed with the column. An activity ratchet gear is fixedly sleeved on the outer surface of the rotating shaft, and a transmission gear is also fixedly sleeved on the outer surface of the rotating shaft. A rack meshing with the transmission gear is fixedly arranged on the inner wall of the activity frame. When the transmission gear rotates, the activity frame can be moved through meshing with the rack;

[0017] One end face of the column close to the optical axis includes a first smooth part, a second smooth part and a toothed part. The toothed part is located between the first smooth part and the second smooth part. The toothed part is several ratchet blocks arranged in a straight line at equal intervals, and the ratchet blocks are fixed to the column. The ratchet blocks are movably meshed with the activity ratchet gear. When the stamping upper die and the stamping lower die are in a closed state and move upward for resetting, the first smooth part will not touch the activity ratchet gear until the formed inner pot is completely exposed, and then the toothed part will contact the activity ratchet gear to touch the activity frame. When the activity frame pushes out the inner pot, the continuous upward movement of the column can make the second smooth part contact the activity ratchet gear.

[0018] Preferably, when the column moves downward, the ratchet block cannot be meshed with the activity ratchet gear; when the column moves upward, the ratchet block is meshed with the activity ratchet gear, that is, it is ensured that only when the column moves upward, the ratchet block can be meshed with the activity ratchet gear and make it rotate.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] Through the action of the driving unit, when the upper stamping die moves downward and closes with the lower stamping die, the alignment unit can be triggered. Under the action of the alignment unit, it can ensure that the circular metal sheet is located at the exact center position of the lower stamping die, thus avoiding the situation where the edge of the inner pot body stamped out is missing or incomplete due to the deviation in the placement of the metal sheet. Moreover, when the upper stamping die resets, the formed inner pot body can be automatically removed from the upper end surface of the lower stamping die through the blanking unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a side view of the present invention;

[0023] Figure 3 is a schematic diagram of the turntable structure of the present invention;

[0024] Figure 4 is the present invention Figure 3 magnified view of part A in;

[0025] Figure 5 is a schematic diagram of the tooth groove structure of the present invention;

[0026] Figure 6 is the present invention Figure 5 magnified view of part B in;

[0027] Figure 7 is the present invention Figure 5 magnified view of part C in;

[0028] Figure 8 is a schematic diagram of the structure of the movable ratchet gear and ratchet block of the present invention.

[0029] In the figure: 1. Upper stamping die; 2. Lower stamping die; 3. Straight notch; 4. U-shaped frame; 5. Slide block; 6. First slide bar; 7. First spring; 8. Push block; 9. Through groove; 10. Second slide bar; 11. Turntable; 12. Inclined groove; 13. Mounting plate; 14. Sleeve; 15. Optical axis; 16. Spiral groove; 17. Slide post; 18. Tooth disc; 19. Positioning arc groove; 20. Dome pin; 21. Slide disc; 22. Second spring; 23. Fixed frame; 24. Rotating shaft; 25. Movable ratchet gear; 26. Transmission gear; 27. Movable frame body; 28. Holding rod; 29. Third spring; 30. Column; 31. Ratchet block; 32. Rack; 33. Tooth groove. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1: Please refer to Figures 1-7 , an automatic stamping machine for the inner pot of a pressure cooker shown in the figure, comprising: a stamping upper die 1 and a stamping lower die 2 that play a role in stamping and forming a metal sheet. The stamping lower die 2 is fixed in position, and the stamping upper die 1 is located directly above the stamping lower die 2. At least three straight notches 3 are provided on the outer surface of the top of the stamping lower die 2 and are evenly distributed in a circumferential manner. A positioning unit is provided on one side of each straight notch 3 away from the center of the stamping lower die 2. The positioning unit is used to adjust the position of the metal sheet placed on the upper end surface of the stamping lower die 2. The stamping upper die 1 can move up and down under the action of a stamping machine, and when it closes with the stamping lower die 2, it can stamp and form the metal sheet;

[0032] It further comprises: a driving unit for driving at least three positioning units to adjust the position of the metal sheet. The driving unit is arranged on the outer walls of the stamping upper die 1 and the stamping lower die 2;

[0033] A blanking unit for pushing the stamped inner pot workpiece away from the upper end surface of the stamping lower die 2. The blanking unit is located outside the stamping upper die 1.

[0034] The positioning unit comprises a U-shaped frame 4 fixedly installed on the outer wall of the stamping lower die 2. The inner notch of the U-shaped frame 4 coincides with the notch of the straight notch 3. A slider 5 is slidably assembled at the inner bottom of the U-shaped frame 4. At least two first sliding rods 6 are axially slidably inserted into the slider 5. A push block 8 is fixedly arranged between the tops of the two first sliding rods 6. The push block 8 is slidably assembled with the straight notch 3 and the U-shaped frame 4. A first spring 7 is sleeved on the outer surface of the first sliding rod 6. The two ends of the first spring 7 are respectively fixed to the push block 8 and the slider 5. A through slot 9 is provided at the bottom of the U-shaped frame 4. The bottom of the first sliding rod 6 is placed inside the through slot 9. When the first spring 7 is in an uncompressed state, a part of the push block 8 is inside the U-shaped frame 4, and a part of it extends out of the top of the U-shaped frame 4.

[0035] The driving unit includes a turntable 11 rotatably sleeved on the outer surface of the stamping lower die 2, and the turntable 11 is located below the U-shaped frame 4. An inclined groove 12 is formed inside the turntable 11, and the number of inclined grooves 12 is the same as that of the U-shaped frames 4. A second slide bar 10 is fixedly arranged at the bottom of each slider 5, and the second slide bar 10 simultaneously slides through the through groove 9 and the inclined groove 12. A transmission component is arranged outside the turntable 11. When the turntable 11 deflects, due to the simultaneous limitation of the through groove 9 and the inclined groove 12 on the second slide bar 10, the second slide bar 10 can drive the slider 5 to move towards the center of the stamping lower die 2.

[0036] The transmission component includes a mounting plate 13 fixedly arranged on the side wall of the stamping lower die 2. A sleeve 14 is rotatably sleeved inside the mounting plate 13. A toothed disc 18 is sleeved on the outer surface of the sleeve 14. A number of tooth grooves 33 are formed on the outer surface of the turntable 11, and the toothed disc 18 is movably engaged with the tooth grooves 33. A smooth shaft 15 is slidably inserted inside the sleeve 14, and a spiral groove 16 is formed on the outer surface of the smooth shaft 15. A sliding column 17 fixedly engaged with the spiral groove 16 is arranged on the inner wall of the sleeve 14. The top of the smooth shaft 15 is fixed to the outer wall of the stamping upper die 1. A clamping component is also arranged between the sleeve 14 and the toothed disc 18. When the smooth shaft 15 moves downward, due to the engagement of the sliding column 17 and the spiral groove 16, the sleeve 14 can rotate inside the mounting plate 13.

[0037] The toothed disc 18 is rotatably sleeved on the outer wall of the sleeve 14. A number of positioning arc grooves 19 are formed on the outer surface of the sleeve 14 at equal circumferential intervals. At least two sliding discs 21 distributed radially are slidably installed inside the toothed disc 18. A second spring 22 is arranged between the end face of the sliding disc 21 far from the sleeve 14 and the toothed disc 18. A dome-shaped pin 20 slidably penetrating the toothed disc 18 is fixedly arranged on the end face of the sliding disc 21 close to the sleeve 14, and the dome-shaped end of the dome-shaped pin 20 is movably engaged with the positioning arc groove 19. When a relatively large rotational force is generated between the sleeve 14 and the toothed disc 18, the dome-shaped end of the dome-shaped pin 20 will disengage from the inside of the positioning arc groove 19.

[0038] One end of the inclined groove 12 is close to the center of the stamping lower die 2, and the other end is far from the center of the stamping lower die 2, that is, the inclined groove 12 can push the second slide bar 10 to move.

[0039] The volume of the dome-shaped pin 20 embedded inside the positioning arc groove 19 is smaller than the total volume of the dome-shaped port of the dome-shaped pin 20, so as to facilitate the positioning arc groove 19 to exert a thrust on the dome-shaped pin 20.

[0040] Working principle: When a metal sheet is placed on the upper end surface of the stamping lower die 2 by a manipulator and the stamping upper die 1 moves downward, due to the sliding fit between the sliding column 17 and the spiral groove 16, the downward movement of the optical axis 15 can make the sleeve 14 drive the gear disk 18 to rotate. Since the gear disk 18 is meshed and assembled with the turntable 11 through the tooth grooves 33, the turntable 11 can also deflect at this time. Refer to the appendix Figure 4 When the optical axis 15 moves downward, the turntable 11 deflects clockwise. Since the second sliding rod 10 cooperates with the through groove 9 and the inclined groove 12 at the same time, the second sliding rod 10 can drive the slider 5 to slide towards the straight groove opening 3, and push and squeeze the metal sheet through the push block 8 to perform centering processing on the metal sheet, so as to ensure that the metal sheet can be in the center position of the stamping lower die 2 when being stamped.

[0041] After the position of the metal sheet is adjusted, the push block 8 can no longer move, but the optical axis 15 is still moving downward continuously. At this time, a large torsional force will be generated between the sleeve 14 and the gear disk 18, which will cause the positioning arc groove 19 to push out the dome pin 20, and the two will separate, allowing the sleeve 14 to rotate idly inside the gear disk 18;

[0042] When the stamping upper die 1 is about to close with the stamping lower die 2, the stamping upper die 1 will push the push block 8 downward, so that the push block 8 retracts into the straight groove opening 3 and the U-shaped frame 4, and compresses the first spring 7, that is, to ensure that the push block 8 will not affect the stamping operation of the stamping upper die 1 and the stamping lower die 2.

[0043] Embodiment 2: Please refer to Figure 8 , this embodiment is a further description of Embodiment 1. The blanking unit includes columns 30 distributed on the side of the optical axis 15 away from the stamping lower die 2, and the top of the column 30 is fixed to the top of the optical axis 15. An activity frame 27 is placed around the optical axis 15 and the column 30. A fixed frame 23 is also fixedly arranged on the outer surface of the stamping lower die 2, and the column 30 is axially slidably inserted between the fixed frames 23. At least one holding rod 28 is fixedly arranged on the end surface of the fixed frame 23 away from the optical axis 15, and the end of the holding rod 28 away from the optical axis 15 axially slides through the activity frame 27. A third spring 29 is sleeved outside the holding rod 28, and both ends of the third spring 29 are fixed to the activity frame 27 and the fixed frame 23 respectively. A moving component is also arranged between the column 30 and the activity frame 27. Each time the stamping upper die 1 and the stamping lower die 2 separate and move upward, the activity frame 27 can be moved between the stamping upper die 1 and the stamping lower die 2.

[0044] The moving part includes a rotating shaft 24 rotatably assembled inside a fixed frame 23, and the rotating shaft 24 is vertically distributed with respect to the column 30. A movable ratchet gear 25 is fixedly sleeved on the outer surface of the rotating shaft 24, and a transmission gear 26 is also fixedly sleeved on the outer surface of the rotating shaft 24. A rack 32 meshing with the transmission gear 26 is fixedly arranged on the inner wall of the movable frame 27. When the transmission gear 26 rotates, the movable frame 27 can be moved by meshing with the rack 32.

[0045] One end face of the column 30 close to the optical axis 15 includes a first smooth part, a second smooth part and a toothed part. The toothed part is located between the first smooth part and the second smooth part. The toothed part is a plurality of ratchet blocks 31 arranged at equal intervals in a straight line, and the ratchet blocks 31 are fixed to the column 30. The ratchet blocks 31 are movably meshed with the movable ratchet gear 25. When the stamping upper die 1 and the stamping lower die 2 are in the closed state and move upward for resetting, the first smooth part will not touch the movable ratchet gear 25 until the formed inner pot is completely exposed, and then the toothed part will contact the movable ratchet gear 25 to touch the movable frame 27. When the movable frame 27 pushes out the inner pot, the continuous upward movement of the column 30 can make the second smooth part contact the movable ratchet gear 25.

[0046] When the column 30 moves downward, the ratchet blocks 31 cannot be meshed with the movable ratchet gear 25; when the column 30 moves upward, the ratchet blocks 31 are meshed with the movable ratchet gear 25, that is, it is ensured that only when the column 30 moves upward, the ratchet blocks 31 can be meshed with the movable ratchet gear 25 and make it rotate.

[0047] In this embodiment: After the inner pot is stamped and formed by the stamping upper die 1 and the stamping lower die 2, the inner pot will remain on the upper end face of the stamping lower die 2. It is necessary to manually take away the inner pot, and then place the next metal sheet for stamping. Because when the stamping upper die 1 and the stamping lower die 2 are performing stamping operations, in order to ensure safety, the staff needs to stay away appropriately and will approach to take away the inner pot after stamping is completed. This results in the staff having to walk back and forth to pick up materials. Therefore, in this solution:

[0048] When the stamping upper die 1 moves upward for resetting after stamping is completed, the optical axis 15 and the column 30 will move upward at the same time. Among them, the first smooth part, the toothed part and the second smooth part are distributed from top to bottom in sequence. Therefore, when the column 30 moves upward, the first smooth part will not touch the movable ratchet gear 25, and the length of the first smooth part is greater than the height of the inner pot, that is, it can be ensured that when the toothed part contacts the movable ratchet gear 25, the inner pot is in a completely exposed state. At this time, with the continuous upward movement of the column 30, the ratchet blocks 31 can be meshed with the movable ratchet gear 25, making the movable ratchet gear 25 drive the rotating shaft 24 and the transmission gear 26 to rotate. Refer to the appendix Figure 8In [the above], when the transmission gear 26 rotates clockwise, through the meshing of the transmission gear 26 and the rack 32, the movable frame 27 can be horizontally moved towards the upper end surface of the stamping lower die 2, and the inner pot can be pushed forward, so that the inner pot leaves the upper end surface of the stamping lower die 2. That is, the staff only needs to use a receiving tool in the prior art to directly receive the inner pot without manual picking.

[0049] When the ratchet part is separated from the movable ratchet gear 25 and the second smooth part is separated from the movable ratchet gear 25, at this time, the movable ratchet gear 25 is no longer restricted, and under the action of the compressed third spring 29, the movable frame 27 can quickly elastically return to its original position, thus not affecting the subsequent placement of the metal sheet.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic punching machine for a pressure cooker liner, characterized in that: include: A stamping upper die (1) and a stamping lower die (2) for stamping and forming a metal sheet, wherein the stamping lower die (2) is fixed in position and the stamping upper die (1) is located directly above the stamping lower die (2), and the top outer surface of the stamping lower die (2) is provided with at least three straight slots (3) equidistantly distributed in a circumference, and each straight slot (3) is provided with a positioning unit on a side away from the center of the stamping lower die (2), and the positioning unit is used to adjust the position of the metal sheet placed on the upper end surface of the stamping lower die (2); Also includes: A driving unit, used for driving at least three of the alignment units to adjust the position of the metal sheet, the driving unit being arranged on the outer walls of the stamping upper die (1) and the stamping lower die (2); A material discharge unit, used for pushing the pot liner workpiece that has been stamped away from the upper end surface of the stamping lower die (2), the material discharge unit being located outside the stamping upper die (1); A U-shaped frame (4) is fixedly mounted on the outer wall of the stamping lower die (2); a rotating disk (11) is fixedly sleeved on the outer surface of the stamping lower die (2) and is arranged below the U-shaped frame (4); an inclined groove (12) is provided inside the rotating disk (11); and a transmission component is arranged outside the rotating disk (11); The transmission component comprises a mounting plate (13) fixedly mounted on the side wall of the stamping lower die (2), and a sleeve (14) is rotatably sleeved inside the mounting plate (13), a toothed disc (18) is sleeved on the outer surface of the sleeve (14), a plurality of tooth grooves (33) are provided on the outer surface of the rotating disc (11), and the toothed disc (18) is movably engaged with the tooth grooves (33), an optical axis (15) is slidably inserted inside the sleeve (14), and a spiral groove (16) is provided on the outer surface of the optical axis (15), a sliding column (17) movably engaged with the spiral groove (16) is fixedly provided on the inner wall of the sleeve (14), the top of the optical axis (15) is fixed to the outer wall of the stamping upper die (1), and a clamping member is further provided between the sleeve (14) and the toothed disc (18).

2. The automatic punching machine for a pressure cooker liner according to claim 1, characterized in that: The alignment unit comprises a slider (5) slidably mounted on the bottom of the inner side of the U-shaped frame (4), and at least two first slide bars (6) are axially slidably inserted inside the slider (5), the internal notch of the U-shaped frame (4) coincides with the notch of the straight notch (3), a push block (8) is fixedly arranged between the tops of the two first slide bars (6), and the push block (8) is slidably mounted with the straight notch (3) and the U-shaped frame (4), a first spring (7) is sleeved on the outer surface of the first slide bar (6), and the two ends of the first spring (7) are respectively fixed to the push block (8) and the slider (5), a through groove (9) is opened at the bottom of the U-shaped frame (4), and the bottom of the first slide bar (6) is placed inside the through groove (9).

3. The automatic punching machine for a pressure cooker liner according to claim 2, characterized in that: The driving unit comprises a second sliding rod (10) fixed at the bottom of each sliding block (5), and the second sliding rod (10) slides through the through slot (9) and the inclined slot (12) at the same time, and the number of the inclined slots (12) is consistent with the number of the U-shaped frames (4).

4. The automatic punching machine for a pressure cooker liner according to claim 1, characterized in that: The toothed disc (18) is rotatably sleeved on the outer wall of the sleeve (14); the outer surface of the sleeve (14) is provided with a plurality of circumferentially equidistantly distributed positioning arc grooves (19); at least two radially distributed sliding discs (21) are slidably mounted inside the toothed disc (18); a second spring (22) is arranged between an end surface of the sliding disc (21) away from the sleeve (14) and the toothed disc (18); a dome pin (20) is fixedly arranged on an end surface of the sliding disc (21) close to the sleeve (14) and slidably penetrates the toothed disc (18); and a dome-shaped top end of the dome-shaped top pin (20) is movably engaged with the positioning arc groove (19).

5. The automatic punching machine for a pressure cooker liner according to claim 3, characterized in that: One end of the inclined groove (12) is close to the center of the stamping lower die (2), and the other end is far from the center of the stamping lower die (2).

6. The automatic punching machine for a pressure cooker liner according to claim 4, characterized in that: The volume of the dome latch (20) embedded in the positioning arc groove (19) is smaller than the entire volume of the dome port of the dome latch (20).

7. The automatic punching machine for a pressure cooker liner according to claim 3, characterized in that: The blanking unit comprises a column (30) distributed on a side of the optical axis (15) away from the stamping lower die (2), and the top of the column (30) is fixed to the top of the optical axis (15), a movable frame (27) is placed around the optical axis (15) and the column (30), a fixing frame (23) is fixedly arranged on the outer surface of the stamping lower die (2), and the column (30) is axially slidably inserted between the fixing frames (23), at least one retaining rod (28) is fixedly arranged on an end surface of the fixing frame (23) away from the optical axis (15), and an end of the retaining rod (28) away from the optical axis (15) axially slides through the movable frame (27), a third spring (29) is sleeved on the outside of the retaining rod (28), and two ends of the third spring (29) are respectively fixed to the movable frame (27) and the fixing frame (23), and a moving component is also arranged between the column (30) and the movable frame (27).

8. The automatic punching machine for a pressure cooker liner according to claim 7, characterized in that: The movable component comprises a rotating shaft (24) rotatably mounted inside the fixed frame (23), and the rotating shaft (24) and the column (30) are arranged vertically, a movable ratchet gear (25) is fixedly mounted on the outer surface of the rotating shaft (24), a transmission gear (26) is also fixedly mounted on the outer surface of the rotating shaft (24), and a rack (32) meshing with the transmission gear (26) is fixedly mounted on the inner wall of the movable frame (27); An end surface of the column (30) close to the optical axis (15) comprises a first smooth portion, a second smooth portion and a meshing portion, wherein the meshing portion is located between the first smooth portion and the second smooth portion, and the meshing portion is a plurality of ratchet blocks (31) distributed equidistantly in a straight line, and the ratchet blocks (31) are fixed to the column (30), and the ratchet blocks (31) are movably meshed with the movable ratchet gear (25).

9. The automatic punching machine for a pressure cooker liner according to claim 8, characterized in that: When the column (30) moves downward, the ratchet block (31) cannot mesh with the movable ratchet gear (25); when the column (30) moves upward, the ratchet block (31) meshes with the movable ratchet gear (25).

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