Multi-channel high-speed production line stamping device for easy-open lids

Abstract

The invention relates to the technical field of easy-to-pull lid production equipment, and discloses an easy-to-pull lid multi-channel high-speed production line stamping device which is built on a production line of a conveying device and comprises a machining table, a stamping unit is installed on the machining table in a lifting mode, and an auxiliary guide assembly is installed on one side of the top face of the machining table in a suspended mode. A position correcting assembly used for correcting metal sheets is installed under the auxiliary guiding assembly, a feeding assembly is fixedly installed on the top face, between the auxiliary guiding assembly and the stamping unit, of the machining table, and through cooperative movement of the position correcting assembly and the auxiliary guiding assembly, the problems of conveying deviation, poor adaptability and material damage in the prior art are solved; the two ends of the two-way lead screw are driven by the second driving motor to drive the two position correcting tables to be synchronously close to or away from each other along the guide rails, and compared with an existing fixed-interval or manual-adjustment structure, the metal sheet adjusting device can be rapidly matched with metal sheets with different widths, and the defects of low efficiency and large deviation caused by manual adjustment are thoroughly eradicated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of easy-open lid production equipment, and particularly relates to a multi-channel high-speed production line stamping device for easy-open lids. BACKGROUND

[0002] The core use of the multi-channel high-speed production line stamping device for easy-open lids is to realize continuous and high-precision processing of the coiled metal sheet (raw material of the easy-open lid) in the production line of the conveying device, correct the conveying deviation of the metal sheet through the position correcting assembly, complete stable clamping and conveying through the cooperation of the auxiliary guide assembly and the feeding assembly, and finally cut the continuous metal sheet into a segmented metal sheet meeting the subsequent easy-open lid forming requirements through the stamping unit composed of the upper and lower dies with offset teeth and grooves, and convey the segmented metal sheet to the next process through the conveying device.

[0003] However, the existing device lacks a precise and self-adaptive position correcting structure, and the coiled metal sheet is prone to horizontal deviation due to the curling stress of the coiled material itself and uneven conveying traction when the coiled metal sheet is uncoiled. At the same time, the existing position correcting mechanism is designed with fixed spacing or manually adjustable spacing, which cannot quickly adapt to metal sheets of different widths, has low adjustment efficiency and is prone to adjustment deviation.

[0004] In addition, there is no stable lateral constraint during the conveying of the metal sheet, and the deviation problem is aggravated during high-speed conveying, which causes the metal sheet to fail to accurately enter the stamping unit, thereby causing subsequent cutting position deviation.

[0005] Moreover, the feeding mechanism and the guide mechanism of the existing device are rigidly connected and lack buffering and adjusting ability. Since the coiled metal sheet has slight thickness fluctuations, the rigid clamping structure either injures the thin metal sheet due to excessive pressure or causes the metal sheet to slip due to insufficient pressure, which cannot achieve uniform conveying. At the same time, the guide and feeding assemblies of some devices have no linkage cooperation and rely only on single driving conveying, which further aggravates the shaking and deviation during conveying and affects the subsequent stamping precision.

[0006] Therefore, it is necessary to provide a multi-channel high-speed production line stamping device for easy-open lids to solve the above problems. SUMMARY

[0007] The present application aims to provide a technical solution to solve the problems in the background art.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A kind of easy-open lid multi-channel high-speed production line stamping device, including stamping device, the stamping device is built on the production line of transport device, the stamping device includes processing table, stamping unit is installed on the processing table and is lifted and lowered, the top surface of the processing table one side is suspended and is installed with auxiliary guide component, the bottom of the auxiliary guide component is installed with the rectification position component for metal sheet correction, the top surface of the processing table between the auxiliary guide component and stamping unit is fixedly installed with feeding assembly; Wherein, the rectification position component includes second mounting bracket, second drive motor, bidirectional screw rod, nut seat, rectification table and linear limiting mechanism, the second mounting bracket is fixedly installed on the top surface of processing table, the second drive motor is fixedly installed on the side wall of second mounting bracket, one end of the bidirectional screw rod is connected with the output shaft of second drive motor, the other end of the bidirectional screw rod is rotatably installed on the processing table by bearing seat, the side wall of the rectification table is fixedly installed with nut seat, the inner portion of the nut seat is respectively threadedly installed with both ends of bidirectional screw rod, and the rectification table is slidably installed on the processing table by linear limiting mechanism.

[0009] Preferably, the rectification table includes sliding table, through slot and guide column, the side wall of the sliding table is provided with through slot, the bidirectional screw rod passes through the through slot, the bottom surface of the sliding table is slidably installed on the processing table by linear limiting mechanism, the top of the sliding table is provided with a missing slot, and a plurality of guide columns are rotatably installed in the missing slot.

[0010] Preferably, the top of the sliding table is in transverse strip structure, and the missing slot is a rectangular slot.

[0011] Preferably, the linear limiting mechanism includes guide rail and sliding seat, the guide rail is fixedly installed on the top surface of the processing table, and the sliding seat is fixedly installed on the bottom surface of the sliding table.

[0012] Preferably, the auxiliary guide component includes suspension, fixed frame, buffer mechanism, rotating frame, support and auxiliary roller, the suspension is suspendedly installed on one side of the top surface of the processing table, the fixed frame is fixedly installed at the center of the top surface of the suspension, the buffer mechanism is fixedly installed in the fixed frame, the bottom surface center of the suspension is fixedly installed with the support, the two ends of the rotating frame are rotatably installed on the support through fixed shaft, the auxiliary roller is rotatably installed on the bottom of the rotating frame through bearing, and the top of the rotating frame is insertedly installed with the buffer mechanism.

[0013] Preferably, the top of the rotating frame is integrally formed with a rotating plate, the side wall of the rotating plate is provided with a sliding groove, and the buffer mechanism is movably installed in the sliding groove.

[0014] Preferably, the buffering mechanism comprises an air spring and a gasket, the air spring is fixedly installed in the fixed frame, the movable end of the air spring is inserted into the sliding groove, and the gasket is sleeved on the movable end of the air spring and is threadedly installed through the nut.

[0015] Preferably, the feeding assembly comprises a first driving motor, a first mounting frame, a rotating rod and a driving roller, the first driving motor is fixedly installed on the side wall of the machining table through the first mounting frame, one end of the rotating rod is key-connected with the output shaft of the first driving motor, the other end of the rotating rod is rotatably installed on the top surface of the machining table through a bearing seat, and the driving roller is fixedly installed on the side wall of the rotating rod.

[0016] Preferably, the driving roller is mirror-imaged with the auxiliary roller, and the metal sheet is transported into the stamping unit from between the driving roller and the auxiliary roller under the rotation of the driving roller.

[0017] Preferably, the stamping unit comprises a lifting table, a telescopic motion device, a shaft sleeve and a slide column, the four corners of the lifting table are fixedly installed with the top ends of the slide columns respectively, the shaft sleeves are fixedly installed on the top surface of the machining table respectively, the slide columns are slidingly installed in the shaft sleeves, the bottom surface of the lifting table is fixedly installed with the driving ends of the telescopic motion devices respectively, and the telescopic motion device is installed in the inside of the machining table. The top surface of the machining table is fixedly installed with a stamping mounting plate, the stamping mounting plate is fixedly installed with a lower die through screws, the bottom surface of the lifting table is fixedly installed with an upper die through screws, the opposite surfaces of the upper die and the lower die are provided with staggered tooth grooves, and the tooth groove of the upper die is slidingly inserted with the tooth groove of the lower die under the piston motion of the lifting table.

[0018] The technical effects and advantages of the present application are as follows: 1. The present application solves the problems of conveying deviation, poor adaptability and material damage in the prior art through the cooperative motion of the position correcting assembly and the auxiliary guide assembly. The forward and reverse threads at the two ends of the bidirectional screw rod can drive the two position correcting tables to synchronously approach or move away along the guide rail under the driving of the second driving motor. Compared with the existing fixed spacing or manual adjustment structure, the present application can not only quickly adapt to metal sheets of different widths, but also completely eliminates the disadvantages of low efficiency and large deviation caused by manual adjustment. The linear limiting mechanism, through the cooperation of the guide rail and the slide, ensures that the correction table always slides parallel, further improving the accuracy of the spacing adjustment. At the same time, the tapered guide column, which is wider at the top and narrower at the bottom, can generate a continuous lateral guiding force by using the inclined surface, effectively offsetting the curling stress of the rolled metal sheet and the uneven conveying traction force. Even under high-speed conveying conditions, it can quickly correct the deviated metal sheet to the center conveying channel, forming a stable lateral constraint, preventing the metal sheet from failing to accurately enter the stamping unit due to deviation, and reducing the shearing position deviation. 2. This technical solution solves the problems of insufficient buffering, conveying vibration, and material damage caused by the rigid connection of existing devices by using a mirror linkage structure of an air spring buffer auxiliary guide component and a feeding component. The air spring in the auxiliary guide component uses the gas compression characteristics to achieve flexible buffering, which can adaptively expand and contract according to the thickness fluctuation of the metal sheet. With the help of the gasket, the initial preload can be adjusted by the nut. This provides sufficient clamping force to prevent the metal sheet from slipping, and avoids the damage to the thin metal sheet caused by rigid clamping. At the same time, the auxiliary roller and the drive roller of the feeding component are mirrored to form a linkage clamping and conveying structure, which replaces the existing single drive mode. The rotational friction of the drive roller provides continuous and stable conveying power, effectively suppressing vibration and deviation during the conveying process, ensuring that the metal sheet enters the stamping unit at a uniform speed and accurately. This provides a pre-guarantee for the precise shearing of the misaligned grooves of the upper and lower dies, and improves the dimensional consistency and edge accuracy of the segmented metal sheet after stamping. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the stamping device for the multi-channel high-speed production line of the easy-open lid of the present invention; Figure 2 This is a schematic diagram of the stamping device of the present invention; Figure 3 This is a schematic diagram of the assembly of the auxiliary guiding component, the positioning component, and the feeding component of the present invention; Figure 4 This is a schematic diagram of the auxiliary guiding component and the feeding component of the present invention; Figure 5 This is a schematic diagram of the structure of the orthopedic assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the orthopedic platform of the present invention; Figure 7 This is a schematic diagram of the upper and lower molds of the present invention.

[0020] In the picture: 1. Stamping device; 11. Machining table; 12. Lifting table; 13. Bushing; 14. Sliding column; 15. Telescopic motion device; 2, auxiliary guide assembly; 21, suspension; 22, fixed frame; 23, air spring; 24, rotating plate; 25, sliding groove; 26, gasket; 27, rotating frame; 28, support; 29, auxiliary roller; 3, feeding assembly; 31, first driving motor; 32, first mounting frame; 33, rotating rod; 34, driving roller; 4, straightening assembly; 41, second mounting frame; 42, second driving motor; 43, straightening table; 431, sliding table; 432, through slot; 433, missing slot; 434, guide column; 44, guide rail; 45, sliding seat; 46, nut seat; 47, bidirectional screw rod; 5, stamping mounting plate; 6, lower die; 7, upper die; 8, tooth groove; 9, conveying device. DETAILED DESCRIPTION

[0021] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is merely meant to provide a better understanding of the subject matter described herein and can be changed in function and arrangement without departing from the scope of the present description. Various processes or components can be omitted, substituted, or added according to desired implementations. Additionally, features described with respect to some examples can be combined in other examples.

[0022] Referring to Figures 1 to 7 , the present application provides the following examples: As Figure 1 and Figure 7 shown, a multi-channel high-speed production line stamping device for a pop-up cover includes a stamping device 1, which is built on a production line of a conveying device 9. The stamping device 1 includes a machining table 11, on which a stamping unit is installed up and down. The stamping unit includes a lifting table 12, an extension motion device 15, a shaft sleeve 13, and a sliding column 14. The four corners of the lifting table 12 are respectively fixedly installed with the top ends of the sliding columns 14. The shaft sleeves 13 are respectively fixedly installed on the top surface of the machining table 11. The sliding column 14 is slidingly installed in the shaft sleeve 13. The bottom surface of the lifting table 12 is respectively fixedly installed with the driving ends of the extension motion device 15. The extension motion device 15 is installed inside the machining table 11. The top surface of the machining table 11 is fixedly installed with a stamping mounting plate 5. The stamping mounting plate 5 is fixedly installed with a lower die 6 through screws. The bottom surface of the lifting table 12 is fixedly installed with an upper die 7 through screws. The opposite sides of the upper die 7 and the lower die 6 are provided with staggered tooth grooves 8. The tooth groove 8 of the upper die 7 is slidingly inserted with the tooth groove 8 of the lower die 6 under the piston motion of the lifting table 12.

[0023] The telescopic motion device 15, such as a hydraulic or pneumatic cylinder, drives the lifting platform 12 to make vertical reciprocating motion, and the slide column 14 of the lifting platform 12 synchronously slides along the shaft sleeve 13 on the top surface of the machining table 11. When the lifting platform 12 goes down, the upper die 7 on the bottom surface of the lifting platform 12 moves down, and the tooth groove 8 of the upper die 7 is inserted and connected with the tooth groove 8 of the lower die 6 on the top surface of the machining table 11 in a staggered manner. When the metal sheet is between the upper die 7 and the lower die 6, the insertion and connection of the tooth groove 8 completes the shearing process of the metal sheet.

[0024] As shown in Figure 3 and Figure 4 , the top surface of the machining table 11 is provided with the auxiliary guide assembly 2 on one side, which includes a suspension 21, a fixed frame 22, a buffer mechanism, a rotating frame 27, a support 28 and an auxiliary roller 29. The suspension 21 is suspended on one side of the top surface of the machining table 11, the fixed frame 22 is fixedly installed on the center of the top surface of the suspension 21, the buffer mechanism is fixedly installed in the fixed frame 22, the bottom center of the suspension 21 is fixedly installed with the support 28, the rotating frame 27 is rotatably installed on the support 28 through a fixed shaft at both ends, the auxiliary roller 29 is rotatably installed on the bottom of the rotating frame 27 through a bearing, and the top of the rotating frame 27 is inserted and connected with the buffer mechanism. The top of the rotating frame 27 is integrally formed with a rotating plate 24, the side wall of the rotating plate 24 is provided with a sliding groove 25, the buffer mechanism is movably installed in the sliding groove 25, the buffer mechanism includes an air spring 23 and a gasket 26, the air spring 23 is fixedly installed in the fixed frame 22, the movable end of the air spring 23 is inserted into the sliding groove 25, and the gasket 26 is sleeved on the movable end of the air spring 23 and is threadedly installed through a nut. The auxiliary roller 29 is mirror-imaged with the driving roller 34 of the feeding assembly 3 below, and the metal sheet passes between the two. When the metal sheet passes, the auxiliary roller 29 is subjected to the upward force of the material, drives the rotating frame 27 to rotate around the fixed shaft of the support 28, the rotating plate 24 on the top of the rotating frame 27 synchronously rotates, the sliding groove 25 of the rotating plate 24 drives the movable end of the air spring 23 to compress or elongate, the air spring 23 provides a reverse buffer force through elastic deformation, the gasket 26 adjusts the initial pre-tightening force of the air spring 23 through the nut, restricts the conveying track of the metal sheet, and simultaneously adapts to the thickness fluctuation of the metal sheet to maintain stable clamping pressure.

[0025] A correcting assembly 4 for correcting the metal sheet is installed below the auxiliary guide assembly 2, and a feeding assembly 3 is fixedly installed on the top surface of the machining table 11 between the auxiliary guide assembly 2 and the stamping unit; the feeding assembly 3 includes a first driving motor 31, a first mounting frame 32, a rotating rod 33 and a driving roller 34. The first driving motor 31 is fixedly installed on the side wall of the machining table 11 through the first mounting frame 32, one end of the rotating rod 33 is key-connected with the output shaft of the first driving motor 31, the other end of the rotating rod 33 is rotatably installed on the top surface of the machining table 11 through a bearing seat, and the driving roller 34 is fixedly installed on the side wall of the rotating rod 33. It is worth mentioning that the driving roller 34 is mirror-imaged with the auxiliary roller 29, and the metal sheet is transported into the stamping unit under the rotation of the driving roller 34.

[0026] The first driving motor 31 drives the driving roller 34 to rotate through the rotating rod 33, and the driving roller 34 cooperates with the auxiliary roller 29 of the upper auxiliary guide assembly 2 to clamp the metal sheet and drive the metal sheet to be transported to the stamping unit by the friction of the driving roller 34, thereby providing continuous feeding power of the metal sheet, cooperating with the auxiliary guide assembly 2 to realize stable transportation and trajectory constraint, and ensuring that the metal sheet enters the stamping unit at a uniform speed and accurately.

[0027] As shown in Figure 5 and Figure 6 The straight-line limiting mechanism includes a guide rail 44 and a sliding rail 45, the guide rail 44 is fixedly installed on the top surface of the machining table 11, and the sliding rail 45 is slidably installed on the guide rail 44.

[0028] The straight-line limiting mechanism includes a guide rail 44 and a sliding rail 45, the guide rail 44 is fixedly installed on the top surface of the machining table 11, and the sliding rail 45 is slidably installed on the guide rail 44. The straight-line limiting mechanism includes a guide rail 44 and a sliding rail 45, the guide rail 44 is fixedly installed on the top surface of the machining table 11, and the sliding rail 45 is slidably installed on the guide rail 44. The second driving motor 42 drives the bidirectional screw rod 47 to rotate, the two ends of the bidirectional screw rod 47 are provided with positive and negative threads, and the two nut seats 46 are respectively meshed with the positive and negative thread segments of the bidirectional screw rod 47.

[0029] The plurality of guide columns 434 are all conical, and are conical structures with a wide top and a narrow bottom. The top of the sliding table 431 is a transverse strip structure. The missing slot 433 is a rectangular slot. When the metal sheet passes between the two straightening tables 43, the conical guide columns 434 in the missing slot 433 of the sliding table 431 are in contact with the edges of the material. If the material deviates during conveying, the inclined surface of the conical guide column 434 will generate a lateral guiding force on the material, pushing the material to the middle position between the two straightening tables 43. Thus, by using the guiding effect of the inclined surface, the conveying direction of the metal sheet is corrected, the deviation during unwinding of the coil is eliminated, and the material can accurately enter the feeding assembly 3 and the stamping unit.

[0030] The linear limiting mechanism includes a guide rail 44 and a sliding seat 45. The guide rail 44 is fixedly installed on the top surface of the machining table 11. The sliding seat 45 is fixedly installed on the bottom surface of the sliding table 431. The sliding seat 45 is slidingly installed on the guide rail 44. When the straightening tables 43 slide, the sliding seat 45 on the bottom surface of the sliding table 431 slides along the guide rail 44 on the top surface of the machining table 11 synchronously, so that the straightening tables 43 do not deviate laterally during spacing adjustment or material straightening, the parallelism of the two straightening tables 43 is ensured, and the consistency of material straightening is improved.

[0031] The above describes the embodiments of the present application, but the present application is not limited to the above specific embodiments. The above specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application, which all belong to the protection of the present application.

Claims

1. A press device for a multi-channel high-speed production line of pop-up caps, comprising a press device (1) built on a production line of a transport device (9), characterized in that, The punching device (1) comprises a machining table (11), a punching unit is installed on the machining table (11) in a lifting mode, an auxiliary guide assembly (2) is suspendedly installed on the top surface of the machining table (11), a correcting assembly (4) for metal sheet correction is installed below the auxiliary guide assembly (2), and a feeding assembly (3) is fixedly installed on the top surface of the machining table (11) between the auxiliary guide assembly (2) and the punching unit. The correcting assembly (4) comprises a second mounting frame (41), a second driving motor (42), a bidirectional screw rod (47), a nut seat (46), a correcting table (43) and a linear limiting mechanism, the second mounting frame (41) is fixedly installed on the top surface of the machining table (11), the second driving motor (42) is fixedly installed on the side wall of the second mounting frame (41), one end of the bidirectional screw rod (47) is in key connection with the output shaft of the second driving motor (42), the other end of the bidirectional screw rod (47) is rotatably installed on the machining table (11) through a bearing seat, the side wall of the correcting table (43) is fixedly installed with the nut seat (46), the inner part of the nut seat (46) is in threaded connection with the two ends of the bidirectional screw rod (47), and the correcting table (43) is slidingly installed on the machining table (11) through the linear limiting mechanism.

2. A punch device for a multi-lane high-speed production line of easy open lids according to claim 1, characterized in that, The correcting table (43) comprises a sliding table (431), a through groove (432) and a guide column (434), the side wall of the sliding table (431) is provided with the through groove (432), the bidirectional screw rod (47) passes through the through groove (432), the bottom surface of the sliding table (431) is slidingly installed on the machining table (11) through the linear limiting mechanism, the top of the sliding table (431) is provided with a missing groove (433), and a plurality of guide columns (434) are rotatably installed in the missing groove (433).

3. A punch device for a multi-lane high speed production line of easy open lids according to claim 2, characterized in that, The top of the sliding table (431) is in a transverse strip-shaped structure, and the missing groove (433) is a rectangular groove.

4. A punch device for a multi-lane high speed production line of easy open lids according to claim 2, characterized in that, The linear limiting mechanism comprises a guide rail (44) and a sliding seat (45), the guide rail (44) is fixedly installed on the top surface of the machining table (11), and the sliding seat (45) is fixedly installed on the bottom surface of the sliding table (431) and slidingly installed on the guide rail (44).

5. A multi-pass punch device for a high-speed production line of pop-up caps according to claim 1, characterized in that, The auxiliary guide assembly (2) comprises a suspension bracket (21), a fixed frame (22), a buffer mechanism, a rotating frame (27), a support (28) and an auxiliary roller (29), the suspension bracket (21) is suspendedly installed on one side of the top surface of the machining table (11), the fixed frame (22) is fixedly installed at the center of the top surface of the suspension bracket (21), the buffer mechanism is fixedly installed in the fixed frame (22), the bottom surface center of the suspension bracket (21) is fixedly installed with the support (28), the two ends of the rotating frame (27) are rotatably installed on the support (28) through fixed shafts, the auxiliary roller (29) is rotatably installed at the bottom of the rotating frame (27) through a bearing, and the top of the rotating frame (27) is in plug-in connection with the buffer mechanism.

6. A punch device for a multi-lane high speed production line of pop can lids according to claim 5, characterized in that, The top of the rotating frame (27) is integrally formed with a rotating plate (24), the side wall of the rotating plate (24) is provided with a sliding groove (25), and the buffer mechanism is movably installed in the sliding groove (25).

7. A punch device for a multi-lane high speed production line of pop can lids according to claim 6, characterized in that, The buffer mechanism comprises an air spring (23) and a gasket (26), the air spring (23) is fixedly installed in the fixed frame (22), the movable end of the air spring (23) is inserted into the sliding groove (25), and the gasket (26) is sleeved on the movable end of the air spring (23) and is screw-threadedly installed.

8. A punch device for a multi-lane high speed production line of easy open lids according to claim 5, characterized in that, The feeding assembly (3) comprises a first driving motor (31), a first mounting frame (32), a rotating rod (33) and a driving roller (34), the first driving motor (31) is fixedly installed on the side wall of the machining table (11) through the first mounting frame (32), one end of the rotating rod (33) is connected with the output shaft of the first driving motor (31) in a keyed manner, the other end of the rotating rod (33) is rotatably installed on the top surface of the machining table (11) through a bearing seat, and the driving roller (34) is fixedly installed on the side wall of the rotating rod (33).

9. A punch device for a multi-lane high speed production line of pop can lids according to claim 8, characterized in that, The driving roller (34) is mirror-imaged with the auxiliary roller (29), and the metal sheet is conveyed into the stamping unit from between the driving roller (34) and the auxiliary roller (29) under the rotation of the driving roller (34).

10. A punch device for a multi-lane high speed production line of pop can lids according to claim 1, characterized in that, The stamping unit comprises a lifting table (12), a telescopic movement device (15), a shaft sleeve (13) and a slide column (14), the four corners of the lifting table (12) are fixedly installed with the top ends of the slide columns (14) respectively, the shaft sleeves (13) are fixedly installed on the top surface of the machining table (11) respectively, the slide columns (14) are slidably installed in the shaft sleeves (13), the bottom surface of the lifting table (12) is fixedly installed with the driving ends of the telescopic movement devices (15) respectively, and the telescopic movement devices (15) are installed in the interior of the machining table (11). The top surface of the machining table (11) is fixedly installed with a stamping mounting plate (5), the stamping mounting plate (5) is fixedly installed with a lower die (6) through screws, the bottom surface of the lifting table (12) is fixedly installed with an upper die (7) through screws, the upper die (7) and the lower die (6) are provided with staggered tooth grooves (8) on opposite sides, and the tooth groove (8) of the upper die (7) is slidably inserted into the tooth groove (8) of the lower die (6) under the piston movement of the lifting table (12).

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