Automatic punching machine for inner container of pressure cooker

Abstract

The invention discloses an automatic punching machine for a pressure cooker inner container, and relates to the field of cooker inner container machining, the automatic punching machine comprises an upper punching die and a lower punching die which play a role in punching and forming a metal sheet, the position of the lower punching die is fixed, and the upper punching die is located right above the lower punching die; at least three straight notches which are circumferentially distributed at equal intervals are formed in the outer surface of the top of the lower stamping die, and an alignment unit is arranged on the side, away from the center of the lower stamping die, of each straight notch. Under the action of the alignment unit, it can be guaranteed that the circular metal sheet is located at the dead center position of the stamping lower die, and therefore the situation that due to placement deviation of the metal sheet, the edge of a stamped pot inner container is missing or incomplete is avoided; and the pot inner container formed through stamping can be automatically moved away from the upper end face of the stamping lower die through the discharging unit.

Description

Technical Field

[0001] The invention relates to the field of pot liner processing, in particular to an automatic punching machine for a pressure cooker liner. Background Art

[0002] The inner pot of an electric rice cooker or a pressure cooker is stamped and formed by a stamping machine. The stamping process is to place a round metal sheet at the die port in the stamping machine. Under the drive of the stamping machine, the upper die and the lower die extrude the metal sheet to obtain a blank product of the inner pot of an electric rice cooker or a pressure cooker.

[0003] During the stamping process of the pot liner, the metal sheet is transferred to the mold port by a robotic arm. Since the mold port is also circular, the metal sheet and the mold port need to be placed concentrically to ensure that the stamped pot liner blank is complete. If the metal sheet and the mold port are not placed concentrically, the side edge of the product will be missing after stamping, resulting in defective products. Although the accuracy of metal sheet transfer by the robotic arm is very high, its accuracy will decrease after long-term operation, resulting in errors in the placement of the metal sheets. In addition, there is no centering auxiliary function between the mold port and the metal sheet. Therefore, during the batch stamping process of the pot inner liner, defective products that are not stamped correctly will be produced from time to time. Summary of the invention

[0004] The object of the present invention is to provide an automatic punching machine for a pressure cooker liner to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic stamping machine for a pressure cooker inner pot, comprising: a stamping upper die and a stamping lower die for stamping and forming a metal sheet, the stamping lower die is fixed in position, and the stamping upper die is located directly above the stamping lower die, at least three straight notches equidistantly distributed in a circle are provided on the top outer surface of the stamping lower die, and a positioning unit is provided on a side of each straight notch away from the center of the stamping lower die, 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, the stamping upper die can move up and down under the action of the stamping machine, and when closed with the stamping lower die, the metal sheet can be stamped and formed; It also includes: a driving unit, used to drive at least three of the alignment units to adjust the position of the metal sheet, and the driving unit is arranged on the outer wall of the stamping upper die and the stamping lower die; The material unloading unit is used to push the pot liner workpiece that has been stamped away from the upper end surface of the stamping lower die, and the material unloading unit is located outside the stamping upper die.

[0006] Preferably, the alignment unit includes a U-shaped frame fixedly mounted on the outer wall of the stamping lower die, and the internal notch of the U-shaped frame coincides with the notch of the straight notch, a slider is slidably mounted on the inner bottom of the U-shaped frame, and at least two first sliding rods are axially slidably inserted inside 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 the two ends of the first spring are respectively fixed to the push block and the slider, a through groove is opened at the bottom of the U-shaped frame, and the bottom of the first sliding rod is placed inside the through groove, and when the first spring is in an uncompressed state, 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.

[0007] Preferably, the driving unit includes a turntable rotatably mounted on the outer surface of the stamping lower die, and the turntable is located below the U-shaped frame. An inclined groove is provided inside the turntable, and the number of the inclined grooves is consistent with the number of the U-shaped frames. A second slide bar is fixedly provided at the bottom of each slider, and the second slide bar slides through the through groove and the inclined groove at the same time. A transmission component is provided on the outside of the turntable. When the turntable is deflected, the through groove and the inclined groove limit the second slide bar at the same time, so that the second slide bar can move with the slider toward the center of the stamping lower die.

[0008] Preferably, the transmission component includes a mounting plate fixedly mounted on the side wall of the stamping lower die, and a sleeve is rotatably sleeved inside the mounting plate, a toothed disk is sleeved on the outer surface of the sleeve, a plurality of tooth grooves are provided on the outer surface of the rotating disk, and the toothed disk is movably engaged with the tooth grooves, an optical axis is slidably inserted into the interior of the sleeve, and a spiral groove is provided on the outer surface of the optical axis, a sliding column movably engaged with the spiral groove is fixedly provided on the inner wall of the sleeve, the top of the optical axis is fixed to the outer wall of the stamping upper die, and a locking piece is also provided between the sleeve and the toothed disk, and when the optical axis moves downward, the sleeve can rotate inside the mounting plate due to the engagement of the sliding column with the spiral groove.

[0009] Preferably, the toothed disc is rotatably sleeved on the outer wall of the sleeve, and the outer surface of the sleeve is provided with a plurality of circumferentially equidistantly distributed positioning arc grooves, and at least two radially distributed sliding discs are slidably mounted inside the toothed disc, and a second spring is arranged between an end surface of the sliding disc away from the sleeve and the toothed disc, and an end surface of the sliding disc close to the sleeve is fixedly provided with a dome pin that slides through the toothed disc, and the dome top head of the dome pin is movably engaged with the positioning arc groove, and when a large rotational force is generated between the sleeve and the toothed disc, the dome top head of the dome pin will disengage from the inside of the positioning arc groove.

[0010] Preferably, one end of the inclined groove is close to the center of the stamping lower die, and the other end is far away from the center of the stamping lower die, that is, the inclined groove can push the second sliding rod to move.

[0011] Preferably, the volume of the dome latch embedded in the positioning arc groove is smaller than the entire volume of the dome port of the dome latch, so that the positioning arc groove can apply thrust to the dome latch.

[0012] Preferably, the blanking unit includes a column distributed on the side of the optical axis away from the stamping lower die, and the top of the column is fixed to the top of the optical axis, a movable frame is placed around the optical axis and the column, a fixing frame is also fixedly provided on the outer surface of the stamping lower die, and the column is axially slidably inserted between the fixing frames, at least one retaining rod is fixedly provided on an end surface of the fixing frame away from the optical axis, and the end of the retaining rod away from the optical axis axially slides through the movable frame, a third spring is sleeved on the outside of the retaining rod, and the two ends of the third spring are respectively fixed to the movable frame and the fixing frame, a movable part is also provided between the column and the movable frame, and each time the stamping upper die separates from the stamping lower die and moves upward, the movable frame can be moved between the stamping upper die and the stamping lower die.

[0013] Preferably, the moving component comprises a rotating shaft rotatably mounted inside the fixed frame, and the rotating shaft is vertically distributed with the column, a movable ratchet gear is fixedly mounted on the outer surface of the rotating shaft, a transmission gear is also fixedly mounted on the outer surface of the rotating shaft, and a rack meshing with the transmission gear is fixedly arranged on the inner wall of the movable frame, and when the transmission gear rotates, the movable frame can be moved by meshing with the rack; An end face of the column close to the optical axis includes a first smooth portion, a second smooth portion and a gearing portion, wherein the gearing portion is located between the first smooth portion and the second smooth portion, and is a plurality of ratchet blocks equidistantly distributed in a straight line, and the ratchet blocks are fixed to the column, and the ratchet blocks are movably engaged with the movable ratchet gear. When the stamping upper die and the stamping lower die are in a closed state and move upward to reset, the first smooth portion will not touch the movable ratchet gear, and the gearing portion will not contact the movable ratchet gear to touch the movable frame until the formed pot inner pot is completely exposed. When the movable frame pushes the pot inner pot out, the column continues to move upward to allow the second smooth portion to contact the movable ratchet gear.

[0014] Preferably, when the column moves downward, the ratchet block cannot engage with the movable ratchet gear; when the column moves upward, the ratchet block engages with the movable ratchet gear, that is, the ratchet block can engage with the movable ratchet gear and rotate it only when the column moves upward.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention can trigger the alignment unit when the stamping upper die moves downward and the stamping lower die is closed through the action of the driving unit, and the circular metal sheet can be ensured to be in the exact center position of the stamping lower die under the action of the alignment unit, thereby avoiding the situation that the edge of the stamped pot liner is missing or incomplete due to the deviation of the placement of the metal sheet, and when the stamping upper die is reset, the stamping formed pot liner can be automatically removed from the upper end surface of the stamping lower die through the unloading unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side view of the present invention; Figure 3 It is a schematic diagram of the structure of the turntable of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the tooth groove structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 For the present invention Figure 5 Enlarged view of point C in the middle; Figure 8 It is a schematic diagram of the structure of the movable ratchet gear and the ratchet block of the present invention.

[0017] In the figure: 1, stamping upper die; 2, stamping lower die; 3, straight notch; 4, U-shaped frame; 5, slider; 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 column; 18, toothed disc; 19, positioning arc groove; 20, dome latch; 21, slide disc; 22, second spring; 23, fixed frame; 24, rotating shaft; 25, movable ratchet gear; 26, transmission gear; 27, movable frame; 28, retaining rod; 29, third spring; 30, column; 31, ratchet block; 32, rack; 33, tooth groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1-Figure 7 , an automatic stamping machine for a pressure cooker inner liner shown in the figure, comprising: a stamping upper die 1 and a stamping lower die 2 for 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 equidistantly distributed in a circumference are opened on the top outer surface of the stamping lower die 2, and each straight notch 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, the stamping upper die 1 can move up and down under the action of the stamping machine, and when it is closed with the stamping lower die 2, it can stamp and form the metal sheet; It also includes: a driving unit, which is used to drive at least three alignment units to adjust the position of the metal sheet, and the driving unit is arranged on the outer wall of the stamping upper die 1 and the stamping lower die 2; The unloading unit is used to push the stamped pot liner workpiece away from the upper end surface of the stamping lower die 2, and the unloading unit is located outside the stamping upper die 1.

[0020] The alignment unit includes a U-shaped frame 4 fixedly mounted on the outer wall of the stamping lower die 2, and the internal notch of the U-shaped frame 4 coincides with the notch of the straight notch 3, a slider 5 is slidably mounted on the inner bottom of the U-shaped frame 4, and at least two first slide bars 6 are axially slidably inserted inside the slider 5, a push block 8 is fixedly arranged between the tops of the two first slide bars 6, and 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 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, and when the first spring 7 is not compressed, a part of the push block 8 is inside the U-shaped frame 4, and another part extends out of the top of the U-shaped frame 4.

[0021] The driving unit includes a turntable 11 rotatably mounted 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 opened inside the turntable 11, and the number of the inclined grooves 12 is consistent with the number 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 slides through the through groove 9 and the inclined groove 12 at the same time. A transmission component is arranged on the outside of the turntable 11. When the turntable 11 is deflected, 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 move with the slider 5 toward the center of the stamping lower die 2.

[0022] The transmission component includes 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 turntable 11, and the toothed disc 18 is movably engaged with the toothed 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 piece is also provided between the sleeve 14 and the toothed disc 18, when the optical axis 15 moves downward, the engagement of the sliding column 17 with the spiral groove 16 allows the sleeve 14 to rotate inside the mounting plate 13.

[0023] The toothed disc 18 is rotatably sleeved on the outer wall of the sleeve 14, and the outer surface of the sleeve 14 is provided with a plurality of positioning arc grooves 19 equidistantly distributed around the circumference. At least two radially distributed sliding discs 21 are slidably mounted inside the toothed disc 18, and 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 slidingly penetrating the toothed disc 18 is fixedly arranged on an end surface of the sliding disc 21 close to the sleeve 14, and the dome top head of the dome pin 20 is movably engaged with the positioning arc groove 19. When a large rotational force is generated between the sleeve 14 and the toothed disc 18, the dome top head of the dome pin 20 will be disengaged from the inside of the positioning arc groove 19.

[0024] One end of the inclined groove 12 is close to the center of the stamping lower die 2 , and the other end is far away from the center of the stamping lower die 2 , that is, the inclined groove 12 can push the second sliding rod 10 to move.

[0025] The volume of the dome latch 20 embedded in the positioning arc groove 19 is smaller than the entire volume of the dome end of the dome latch 20 , so that the positioning arc groove 19 can easily apply thrust to the dome latch 20 .

[0026] Working principle: When the metal sheet is placed on the upper end surface of the stamping lower die 2 by the manipulator, when the stamping upper die 1 moves downward, due to the sliding cooperation between the slide post 17 and the spiral groove 16, the downward movement of the optical axis 15 can make the sleeve 14 rotate with the toothed disc 18. Since the toothed disc 18 is meshed and assembled with the rotating disc 11 through the tooth groove 33, the rotating disc 11 can also deflect at this time. Figure 4 When the optical axis 15 moves downward, the turntable 11 deflects clockwise. Since the second slide bar 10 cooperates with the through slot 9 and the inclined slot 12 at the same time, the second slide bar 10 can slide with the slider 5 toward the straight slot 3. The metal sheet is pushed by the push block 8 and centered, thereby ensuring that the metal sheet is in the center position of the stamping lower die 2 when being stamped.

[0027] When the position of the metal sheet is adjusted, the push block 8 can no longer move, but the optical axis 15 continues to move downward. At this time, a large torsional force is generated between the sleeve 14 and the toothed disc 18, causing the positioning arc groove 19 to push the dome pin 20 out, and the two are separated, allowing the sleeve 14 to idle inside the toothed disc 18; 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, allowing the push block 8 to retract into the straight slot 3 and the U-shaped frame 4, so that the first spring 7 is compressed, thereby ensuring that the push block 8 will not affect the stamping operation of the stamping upper die 1 and the stamping lower die 2. Example 2: Please refer to Figure 8 , this embodiment is a further explanation of the first embodiment, the blanking unit includes a column 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, and a movable frame 27 is placed on the periphery of the optical axis 15 and the column 30, and a fixing frame 23 is also fixedly provided on the outer surface of the stamping lower die 2, and the column 30 is axially slidably inserted between the fixing frames 23, and at least one retaining rod 28 is fixedly provided on one end surface of the fixing frame 23 away from the optical axis 15, and the end of the retaining rod 28 away from the optical axis 15 axially slides through the movable frame 27, and the outer sleeve of the retaining rod 28 is provided with a third spring 29, and the two ends of the third spring 29 are respectively fixed to the movable frame 27 and the fixing frame 23, and a moving part is also provided between the column 30 and the movable frame 27, and each time the stamping upper die 1 and the stamping lower die 2 separate and move upward, the movable frame 27 can be moved between the stamping upper die 1 and the stamping lower die 2.

[0028] The moving part includes a rotating shaft 24 rotatably assembled inside the fixed frame 23, and the rotating shaft 24 is vertically distributed with the column 30. The outer surface of the rotating shaft 24 is fixedly sleeved with a movable ratchet gear 25, and the outer surface of the rotating shaft 24 is also fixedly sleeved with a transmission gear 26, and the inner wall of the movable frame 27 is fixedly provided with a rack 32 meshing with the transmission gear 26. When the transmission gear 26 rotates, it can mesh with the rack 32 to allow the movable frame 27 to move; One end face of the column 30 close to the optical axis 15 includes a first smooth portion, a second smooth portion and a gearing portion, wherein the gearing portion is located between the first smooth portion and the second smooth portion, and is a plurality of ratchet blocks 31 equidistantly distributed in a straight line, and the ratchet blocks 31 are fixed to the column 30, and the ratchet blocks 31 are movably engaged with the movable ratchet gear 25. When the stamping upper die 1 and the stamping lower die 2 are in a closed state and move upward to reset, the first smooth portion will not touch the movable ratchet gear 25, and the gearing portion will not contact the movable ratchet gear 25 to touch the movable frame 27 until the formed pot inner pot is completely exposed. When the movable frame 27 pushes the pot inner pot out, the column 30 continues to move upward to allow the second smooth portion to contact the movable ratchet gear 25.

[0029] 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, that is, the ratchet block 31 can mesh with the movable ratchet gear 25 and rotate it only when the column 30 moves upward.

[0030] In this embodiment: after the pot liner is stamped and formed by the stamping upper die 1 and the stamping lower die 2, the pot liner will remain on the upper end surface of the stamping lower die 2, and the pot liner needs to be taken away manually, and then the next metal sheet is placed for stamping. Because 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 only approach to take away the pot liner after the stamping is completed, which causes the staff to walk back and forth to take materials. For this reason, in this solution: When the stamping upper die 1 is reset upward after stamping is completed, the optical axis 15 and the column 30 will move upward at the same time, wherein the first smooth portion, the meshing portion and the second smooth portion are arranged in sequence from top to bottom, so when the column 30 moves upward, the first smooth portion will not touch the movable ratchet gear 25, and the length of the first smooth portion is greater than the height of the pot inner pot, that is, it can be ensured that when the meshing portion contacts the movable ratchet gear 25, the pot inner pot is in a completely exposed state. At this time, the column 30 continues to move upward, and the ratchet block 31 can mesh with the movable ratchet gear 25, allowing the movable ratchet gear 25 to rotate with the rotating shaft 24 and the transmission gear 26, refer to the attached Figure 8 When the transmission gear 26 rotates clockwise, the meshing of the transmission gear 26 and the rack 32 allows the movable frame 27 to move laterally toward the upper end surface of the stamping lower die 2, so that the pot inner pot can be pushed forward to allow the pot inner pot to leave the upper end surface of the stamping lower die 2. That is, the staff only needs to use a material receiving tool in the prior art to directly receive the pot inner pot without manual removal; When the meshing portion is separated from the movable ratchet gear 25 and the second smooth portion is separated from the movable ratchet gear 25, the movable ratchet gear 25 is no longer restricted. Under the action of the compressed third spring 29, the movable frame 27 can quickly elastically retreat and reset, thereby not affecting the subsequent placement of the metal sheet.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 is used to push the pot liner workpiece that has been stamped away from the upper end surface of the stamping lower die (2), and the material discharge unit is located outside the stamping upper die (1).

2. The automatic punching machine for a pressure cooker liner according to claim 1, characterized in that: The alignment unit comprises a U-shaped frame (4) fixedly mounted on the outer wall of the stamping lower die (2), and the internal notch of the U-shaped frame (4) coincides with the notch of the straight notch (3); a slider (5) is slidably mounted on the inner bottom of the U-shaped frame (4), and at least two first slide bars (6) are axially slidably inserted inside the slider (5); 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 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). The turntable (11) is provided with an inclined groove (12) inside, and the number of the inclined grooves (12) is consistent with the number of the U-shaped frames (4). A second sliding rod (10) is fixedly provided at the bottom of each of the sliders (5), and the second sliding rod (10) slides through the through groove (9) and the inclined groove (12) at the same time. A transmission component is provided outside the turntable (11).

4. The automatic punching machine for a pressure cooker liner according to claim 3, characterized in that: 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).

5. The automatic punching machine for a pressure cooker liner according to claim 4, 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).

6. 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).

7. The automatic punching machine for a pressure cooker liner according to claim 5, 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).

8. The automatic punching machine for a pressure cooker liner according to claim 4, 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).

9. The automatic punching machine for a pressure cooker liner according to claim 8, 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).

10. The automatic punching machine for a pressure cooker liner according to claim 9, 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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