Punching knife module

Abstract

A stamping knife module comprises a mounting seat, a linear stamping assembly and a stamping needle assembly. The straight punching assembly and the punching needle assembly are mounted on the mounting seat; the linear punching assembly comprises a first driving device, a first punching rod and a linear punching knife, one end of the first punching rod is connected with the first driving device, the other end of the first punching rod is connected with the linear punching knife, and the first driving device is used for driving the first punching rod and the linear punching knife to reciprocate up and down; the punching needle assembly comprises a second driving device, a second punching rod and a punching needle, one end of the second punching rod is connected with the second driving device, the other end of the second punching rod is connected with the punching needle, and the second driving device is used for driving the second punching rod and the punching needle to reciprocate up and down. The stamping knife module is composed of the installation base, the linear stamping assembly and the stamping needle assembly, and key components such as a driving device, a stamping rod and a stamping knife in each assembly are detachable, so that the stamping knife module is more convenient to maintain, replace or adjust, and maintainability and flexibility of the module are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of punching, in particular to a punching knife module. Background Art

[0002] Leather punching machine is a machine that punches out various required holes on leather, paper, cut pieces, and thin metal sheets. It is widely used in the processing of leather products and has the advantages of high production efficiency and high punching accuracy. The leather punching machine currently used has the following shortcomings when used: one mold of the leather punching machine can only produce one corresponding hole. When producing different holes, different punching molds need to be replaced. Therefore, a large number of molds need to be purchased to meet production needs, which increases the cost of the punching machine. In addition, the mold will occupy a lot of space when not in use; frequent replacement of punching molds also limits production efficiency. Utility Model Content

[0003] In view of the problems raised by the background technology, the purpose of the utility model is to provide a punching knife module to solve the problem that the punching knife of the existing punching machine needs to be replaced according to different production needs, resulting in low production efficiency.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A punching die assembly comprises a mounting seat, a slotted punch assembly and a punching needle assembly;

[0006] The straight punch assembly and the punch needle assembly are installed on the mounting seat, and the mounting seat is provided with two vertically penetrating mounting holes;

[0007] The straight punch assembly includes a first driving device, a first punch rod and a straight punch knife, one end of the first punch rod is placed above the mounting seat and is detachably connected to the driving end of the first driving device, the other end of the first punch rod passes through a mounting hole and extends downward from the mounting seat, the other end of the first punch rod is detachably mounted with the straight punch knife, and the first driving device is used to drive the first punch rod and the straight punch knife to reciprocate up and down;

[0008] The punch needle assembly includes a second driving device, a second punch rod and a punch needle. One end of the second punch rod is placed above the mounting seat and is detachably connected to the driving end of the second driving device. The other end of the second punch rod passes through another mounting hole and extends downward from the mounting seat. The punch needle is detachably mounted on the other end of the second punch rod. The second driving device is used to drive the second punch rod and the punch needle to reciprocate up and down.

[0009] Preferably, it also includes a third driving device, a driving wheel, a first wheel sleeve, a second wheel sleeve and a synchronous belt;

[0010] The third driving device is installed on the mounting seat, and the synchronous belt is wound around the outer sides of the driving wheel, the first wheel sleeve and the second wheel sleeve;

[0011] The first wheel sleeve is sleeved outside the first punch rod, and the second wheel sleeve is sleeved outside the second punch rod;

[0012] The driving end of the third driving device is connected to the driving wheel, and is used to drive the first punch rod and the second punch rod to rotate synchronously.

[0013] Preferably, the first driving device comprises a first cylinder barrel, a first piston rod, a first piston and two first air nozzles;

[0014] The two first gas nozzles are respectively arranged at the upper and lower ends of the first cylinder barrel, the first piston rod is passed through the first cylinder barrel, the first piston is installed on the first piston rod and is located in the first cylinder barrel, and the first punch rod is detachably installed at the lower part of the first piston rod;

[0015] The second driving device comprises a second cylinder barrel, a second piston rod, a second piston and two second air nozzles;

[0016] The two second air nozzles are respectively arranged at the upper and lower ends of the second cylinder barrel, the second piston rod is passed through the second cylinder barrel, the second piston is installed on the second piston rod and is located inside the barrel of the second cylinder barrel, and the second punch is detachably installed on the lower part of the second piston rod.

[0017] Preferably, a first limiting portion is provided at the top of the first piston rod, and the first limiting portion can be adjusted up and down along the first piston rod;

[0018] A second limiting portion is disposed on the top of the second piston rod, and the second limiting portion can be adjusted up and down along the second piston rod.

[0019] Preferably, it further comprises a first spring, a first nut, a second spring and a second nut;

[0020] The first nut is mounted on the top of the first punch rod, the first spring is sleeved on the rod body of the first punch rod, one end of the first spring abuts against the first nut, and the other end of the first spring abuts against the top of the first wheel sleeve;

[0021] The second nut is installed on the top of the second punch rod, the second spring is sleeved on the rod body of the second punch rod, one end of the second spring abuts against the second nut, and the other end of the second spring abuts against the top of the second wheel sleeve.

[0022] Preferably, the first punch rod is provided with a first flat key, the first wheel sleeve is provided with a vertical first key slot inside, the first flat key cooperates with the first key slot, and the first flat key moves up and down along the first key slot;

[0023] The shaft of the second punch rod is provided with a second flat key, the interior of the second wheel sleeve is provided with a vertical second key slot, the second flat key cooperates with the second key slot, and the second flat key can move up and down along the second key slot.

[0024] Preferably, it also includes a pressing cylinder, which can be movably installed and connected with the straight punching knife up and down, and a through hole is provided at the bottom of the pressing cylinder, and the through hole is directly opposite to the punching end of the straight punching knife.

[0025] Preferably, a third spring is provided in the barrel of the pressing barrel, one end of the third spring abuts against the straight punch, and the other end of the third spring abuts against the bottom of the inner wall of the barrel of the pressing barrel.

[0026] Preferably, the outer peripheral sleeves of the first wheel sleeve and the second wheel sleeve are provided with rolling bearings, and the rolling bearings are arranged in the mounting hole.

[0027] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0028] The punching knife module of the utility model is composed of a mounting base, a flat punch assembly and a punch needle assembly. The key components inside each assembly, such as a driving device, a punch rod and a punch, are all detachable, making the punching knife module more convenient to repair, replace parts or adjust, thereby improving the maintainability and flexibility of the module; it can be installed in conjunction with existing production equipment to further enhance the functionality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;

[0031] Figure 3 yes Figure 2 A schematic diagram of the structure after the mounting base, the first cylinder barrel and the second cylinder barrel are hidden;

[0032] Figure 4 yes Figure 1 sectional view of

[0033] Figure 5 It is an exploded schematic diagram of the first wheel sleeve, the first punch and the first flat key;

[0034] Figure 6 yes Figure 5 Cross-sectional view of .

[0035] Wherein: mounting seat 1, straight punch assembly 2, first driving device 21, first cylinder barrel 211, first piston rod 212, first piston 213, first air nozzle 214, first limiting portion 215, first punch rod 22, straight punch cutter 23, first spring 24, first nut 25, pressing cylinder 26, through hole 261, third spring 27, punch needle assembly 3, second driving device 31, second cylinder barrel 311, second piston rod 312, second piston 313, second air nozzle 314, second limiting portion 315, second punch rod 32, punch needle 33, second spring 34, second nut 35, first wheel sleeve 41, second wheel sleeve 42, third driving device 43, driving wheel 44, synchronous belt 45, first flat key 51, first keyway 52, second flat key 53, second keyway 54 and rolling bearing 5. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features.

[0039] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] The following is combined with Figures 1 to 6 The technical solution of the utility model is further illustrated by specific implementation methods.

[0041] A punching die assembly comprises a mounting seat 1, a straight punch assembly 2 and a punching needle assembly 3;

[0042] The straight punch assembly 2 and the punch needle assembly 3 are installed on the mounting seat 1, and the mounting seat 1 is provided with two vertically penetrating mounting holes;

[0043] The straight punch assembly 2 includes a first driving device 21, a first punch rod 22 and a straight punch knife 23, one end of the first punch rod 22 is placed above the mounting seat 1 and is detachably connected to the driving end of the first driving device 21, the other end of the first punch rod 22 passes through a mounting hole and extends downward from the mounting seat 1, the other end of the first punch rod 22 is detachably mounted with the straight punch knife 23, and the first driving device 21 is used to drive the first punch rod 22 and the straight punch knife 23 to reciprocate up and down;

[0044] The punch needle assembly 3 includes a second driving device 31, a second punch rod 32 and a punch needle 33. One end of the second punch rod 32 is placed above the mounting seat 1 and is detachably connected to the driving end of the second driving device 31. The other end of the second punch rod 32 passes through another mounting hole and extends downward from the mounting seat 1. The punch needle 33 is detachably mounted on the other end of the second punch rod 32. The second driving device 31 is used to drive the second punch rod 32 and the punch needle 33 to move reciprocatingly up and down.

[0045] The utility model provides a punching tool module, which includes a straight punch component 2 for punching out long strip holes or cutouts and a punching needle component 3 for punching out holes, and the two components have different punching functions. The straight punch 23 is controlled by a first drive device 21 and a first punch rod 22, and the punching needle 33 is controlled by a second drive device 31 and a second punch rod 32. The two punching tool molds are independently controlled, and the two components can work simultaneously or independently, thereby improving production efficiency and expanding the application range of the equipment; in addition, the independent drive devices drive different punching tool molds respectively, which can play a role of precise control, ensuring the accuracy and stability of the straight punch 23 and the punching needle 33 during the punching process, thereby improving the quality of the product.

[0046] Since the first punch rod 22 and the straight punch blade 23 as well as the second punch rod 32 and the punch needle 33 are all detachable, punch rods and punch blades of different specifications and types can be replaced according to actual needs to adapt to different blanking requirements. This design improves the versatility and interchangeability of the equipment and reduces production costs. Specifically, the straight punch blade 23 and the first punch rod 22 (or the punch needle 33 and the second punch rod 32) can be installed and connected by snap-fit ​​or screw-connection. These installation and connection methods are quick and convenient, which is conducive to the daily maintenance and replacement of the punch blade.

[0047] It is further explained that the modular punching knife module can be connected to the existing production equipment through circuit and / or gas connection, so that the cutting function of the existing equipment can be further expanded. Moreover, through reasonable structural design, by installing the mounting base 1 on the existing equipment, the structure is compact and occupies little space. The two punching knife molds cooperate with the specific functions of the existing equipment to improve the production efficiency of the equipment.

[0048] The punching knife module of the utility model is composed of a mounting base 1, a flat punch assembly 2 and a punch needle assembly 3. The key components inside each assembly, such as a driving device, a punch rod and a punch, are all detachable, making the punching knife module more convenient to repair, replace parts or adjust, thereby improving the maintainability and flexibility of the module; it can be installed in existing production equipment to further enhance the functionality of the equipment.

[0049] Furthermore, it also includes a third driving device 43, a driving wheel 44, a first wheel sleeve 41, a second wheel sleeve 42 and a synchronous belt 45;

[0050] The third driving device 43 is installed on the mounting seat 1, and the synchronous belt 45 is wound around the outer sides of the driving wheel 44, the first wheel sleeve 41 and the second wheel sleeve 42;

[0051] The first wheel sleeve 41 is sleeved on the first punch rod 22, and the second wheel sleeve 42 is sleeved on the second punch rod 32;

[0052] The driving end of the third driving device 43 is connected to the driving wheel 44 to drive the first punch rod 22 and the second punch rod 32 to rotate synchronously.

[0053] In a preferred embodiment of the present invention, a rotation drive assembly is further included to drive the first punch rod 22 and the second punch rod 32 to rotate synchronously.

[0054] For the straight punch assembly 2, the third driving device 43 drives the first punch rod 22 to rotate a certain angle, so as to change the inclination direction of the long strip hole cut on the material by the straight punch knife 23. Specifically, by driving the first punch rod 22 and the straight punch knife 23 to punch the material on the workbench twice in cooperation with the first driving device 21, and adjusting the deflection of the straight punch knife 23 during the two punchings by the third driving device 43, a V-shaped opening mark can be punched on the material, which is convenient for the subsequent alignment or positioning of the material.

[0055] For the punch needle assembly 3, the third driving device 43 drives the second punch rod 32 to rotate, which can cooperate with the punch needle 33 in the process of punching the material, and make the holes on the surface of the material more obvious.

[0056] The driving wheel 44 is driven to rotate by the third driving device 43, and the first wheel sleeve 41 and the second wheel sleeve 42 sleeved outside the first punch rod 22 and the second punch rod 32 are synchronously driven by the synchronous belt 45 to rotate, so that the straight punching knife 23 and the punching needle 33 punch the material below from top to bottom, and then the two cutters are driven by the third driving device 43.

[0057] Since the operation of the straight punch 23 and the punch needle 33 is independently controllable, the third drive device 43 and the synchronous belt 45 synchronously drive the first wheel sleeve 41 and the second wheel sleeve 42 without affecting the independent operation of the two punches. Instead, it reduces the setting of the drive device, reduces the coordination time between multiple drive devices, and optimizes energy consumption; improves the structural compactness of the punch module and improves the overall work efficiency.

[0058] Furthermore, the first driving device 21 includes a first cylinder 211, a first piston rod 212, a first piston 213 and two first air nozzles 214;

[0059] The two first air nozzles 214 are respectively arranged at the upper and lower ends of the first cylinder barrel 211, the first piston rod 212 is penetrated through the first cylinder barrel 211, the first piston 213 is installed on the first piston rod 212 and is located inside the first cylinder barrel 211, and the first punch rod 22 is detachably installed at the lower part of the first piston rod 212;

[0060] The second driving device 31 includes a second cylinder 311, a second piston rod 312, a second piston 313 and two second air nozzles 314;

[0061] The two second air nozzles 314 are respectively arranged at the upper and lower ends of the second cylinder barrel 311, the second piston rod 312 is passed through the second cylinder barrel 311, the second piston 313 is installed on the second piston rod 312 and is located inside the barrel of the second cylinder barrel 311, and the second punch rod 32 is detachably installed at the lower part of the second piston rod 312.

[0062] The first piston rod 212 of the first driving device 21 is arranged inside the first cylinder barrel 211, and the first piston 213 is located inside the first cylinder barrel 211. By controlling the air intake and exhaust of the two first air nozzles 214 respectively, the first piston 213 can move up and down inside the first cylinder barrel 211, thereby driving the first piston rod 212 to move up and down. By using the two first air nozzles 214 to control the upper and lower ends of the first cylinder barrel 211 respectively, the reciprocating motion of the first piston 213 and the first piston rod 212 can be controlled more flexibly to achieve faster action response. The cylinder drive method is usually more stable and reliable than other drive methods (such as electric or hydraulic) because the internal structure of the cylinder is simple and is not easily affected by external environmental factors such as temperature and humidity. In addition, since the reciprocating motion of the cylinder is achieved by gas pressure, its motion process is relatively smooth, reducing the damage to the equipment caused by impact or vibration.

[0063] Similarly, the working principle of the second driving device 31 is the same as that of the first driving device 21 , and will not be described in detail herein.

[0064] Furthermore, a first limiting portion 215 is provided at the top of the first piston rod 212, and the first limiting portion 215 can be adjusted up and down along the first piston rod 212;

[0065] A second position limiting portion 315 is disposed at the top of the second piston rod 312 , and the second position limiting portion 315 can be adjusted up and down along the second piston rod 312 .

[0066] The adjustable design of the first limit portion 215 and the second limit portion 315 makes the stroke of the first punch rod 22 and the second punch rod 32 adjustable. This design can conveniently adjust the stroke of the punch rod according to different blanking requirements, thereby increasing the flexibility and adaptability of the device.

[0067] By adjusting the position of the first limiter 215 on the upper part of the first punch rod 22 and the position of the second limiter 315 on the upper part of the second punch rod 32, the stroke of the punch rod can be conveniently controlled without complicated adjustment or replacement of the entire drive device. This convenience can significantly improve work efficiency and reduce downtime in production.

[0068] Specifically, the first limiting portion 215 and the second limiting portion 315 can cooperate with the threads on the punch rod through a nut to achieve upward and downward adjustment.

[0069] Furthermore, it also includes a first spring 24, a first nut 25, a second spring 34 and a second nut 35;

[0070] The first nut 25 is installed on the top of the first punch rod 22, the first spring 24 is sleeved on the rod body of the first punch rod 22, one end of the first spring 24 abuts against the first nut 25, and the other end of the first spring 24 abuts against the top of the first wheel sleeve 41;

[0071] The second nut 35 is installed on the top of the second punch rod 32 , the second spring 34 is sleeved on the rod body of the second punch rod 32 , one end of the second spring 34 abuts against the second nut 35 , and the other end of the second spring 34 abuts against the top of the second wheel sleeve 42 .

[0072] The addition of the first spring 24 and the second spring 34 provides a buffering and shock absorbing effect for the first punch rod 22 and the second punch rod 32. Taking the straight punch assembly 2 as an example, during its working process, the first punch rod 22 punches the material placed below under the drive of the first driving device 21. During the downward movement of the first punch rod 22, the first nut 25 compresses the first spring 24; after completing a punching, when the first driving device 21 drives the first punch rod 22 and the straight punch cutter 23 to reset upward, the compressed first spring 24 releases the elastic force, cooperates with the reset drive of the first driving device 21, and pushes the first nut 25 upward to reset. In addition, the first spring 24 disposed outside the first punch rod 22 can also absorb part of the impact energy, reduce the wear between the first punch rod 22 and the mounting seat 1 or the first wheel sleeve 41, reduce the vibration and noise caused by the impact, and improve the overall stability and service life.

[0073] Similarly, the working principle of the second spring 34 and the second nut 35 at the punch needle assembly 3 is the same as that at the slotted punch assembly 2, and will not be repeated here.

[0074] Furthermore, the first punch rod 22 is provided with a first flat key 51, and the first wheel sleeve 41 is provided with a vertical first key groove 52 inside. The first flat key 51 cooperates with the first key groove 52, and the first flat key 51 moves up and down along the first key groove 52;

[0075] The shaft of the second punch rod 32 is provided with a second flat key 53 , and the interior of the second wheel sleeve 42 is provided with a vertical second key groove 54 . The second flat key 53 cooperates with the second key groove 54 , and the second flat key 53 can move up and down along the second key groove 54 .

[0076] The first flat key 51 on the first punch 22 cooperates with the first keyway 52 in the first wheel sleeve 41, and the connection between the first punch 22 and the first wheel sleeve 41 becomes more stable. This design can ensure that the first punch 22 will not fall off or shake from the first wheel sleeve 41 when punching materials up and down and rotating at high speed, thereby improving the stability and accuracy of punching.

[0077] Similarly, the working principle of the cooperation between the second punch 32, the second flat key 53 and the second keyway 54 of the second wheel sleeve 42 is consistent with the working principle of the first flat key 51 and the first keyway 52, which will not be repeated here.

[0078] Furthermore, it also includes a pressing barrel 26 , which can be installed and connected to the straight punch 23 in an upward and downward movable manner. A through hole 261 is provided at the bottom of the pressing barrel 26 , and the through hole 261 is directly opposite to the punching end of the straight punch 23 .

[0079] During the punching process of the straight punch assembly 2, the pressing cylinder 26 first reaches the material surface and plays a pre-pressing role to position and fix the material to be punched, which helps to reduce the punching defects such as burrs, cracks or dimensional deviations caused by the position offset or deformation of the material during the punching process of the straight punch blade 23, thereby improving the quality and qualified rate of the punching. In addition, the pressing cylinder 26 presses and flattens the material, which can prevent the accumulation or deformation of the material around the punching target position of the straight punch blade 23, thereby reducing the lateral force and impact on the straight punch blade 23 and extending the service life of the straight punch blade 23.

[0080] Furthermore, a third spring 27 is provided in the barrel of the pressing barrel 26 , one end of the third spring 27 abuts against the straight punch 23 , and the other end of the third spring 27 abuts against the bottom of the inner wall of the pressing barrel 26 .

[0081] When the straight punch 23 punches downward, the bottom of the press barrel 26 first hits the material. When the straight punch 23 continues to move downward and passes through the through hole 261, the straight punch 23 compresses the third spring 27. The third spring 27 plays a buffering role, which can absorb and reduce the impact force generated during the punching process, thereby reducing damage to the straight punch 23 and the punched material. Further, after the punching is completed, when the first drive device 21 drives the straight punch 23 to reset upward, the third spring 27 opens and rebounds, and drives the press barrel 26 to stretch downward to cover the straight punch 23 and be located inside the press barrel 26.

[0082] Furthermore, rolling bearings 5 ​​are provided on the outer circumferences of the first wheel sleeve 41 and the second wheel sleeve 42 , and the rolling bearings 5 ​​are provided in the mounting holes.

[0083] The provision of the rolling bearing 5 can greatly reduce the friction of the first wheel sleeve 41 and the second wheel sleeve 42 during the rotation process. Compared with the direct sliding contact between the wheel sleeve and the mounting hole, the rolling bearing 5 transmits force and motion through rolling motion, thereby significantly reducing the friction coefficient, friction heat and wear. This helps to increase the service life of the wheel sleeve and reduce the maintenance cost of the equipment.

[0084] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A punching die set, characterized in that: It includes a mounting base, a slotted punch assembly and a punch needle assembly; The straight punch assembly and the punch needle assembly are installed on the mounting seat, and the mounting seat is provided with two vertically penetrating mounting holes; The straight punch assembly includes a first driving device, a first punch rod and a straight punch knife, one end of the first punch rod is placed above the mounting seat and is detachably connected to the driving end of the first driving device, the other end of the first punch rod passes through a mounting hole and extends downward from the mounting seat, the other end of the first punch rod is detachably mounted with the straight punch knife, and the first driving device is used to drive the first punch rod and the straight punch knife to reciprocate up and down; The punch needle assembly includes a second driving device, a second punch rod and a punch needle. One end of the second punch rod is placed above the mounting seat and is detachably connected to the driving end of the second driving device. The other end of the second punch rod passes through another mounting hole and extends downward from the mounting seat. The punch needle is detachably mounted on the other end of the second punch rod. The second driving device is used to drive the second punch rod and the punch needle to reciprocate up and down.

2. A punching die assembly according to claim 1, characterized in that: It also includes a third driving device, a driving wheel, a first wheel sleeve, a second wheel sleeve and a synchronous belt; The third driving device is installed on the mounting seat, and the synchronous belt is wound around the outer sides of the driving wheel, the first wheel sleeve and the second wheel sleeve; The first wheel sleeve is sleeved on the outside of the first punch rod, and the second wheel sleeve is sleeved on the outside of the second punch rod; The driving end of the third driving device is connected to the driving wheel, and is used to drive the first punch rod and the second punch rod to rotate synchronously.

3. A punching die assembly according to claim 2, characterized in that: The first driving device comprises a first cylinder barrel, a first piston rod, a first piston and two first air nozzles; The two first gas nozzles are respectively arranged at the upper and lower ends of the first cylinder barrel, the first piston rod is passed through the first cylinder barrel, the first piston is installed on the first piston rod and is located in the first cylinder barrel, and the first punch rod is detachably installed at the lower part of the first piston rod; The second driving device comprises a second cylinder barrel, a second piston rod, a second piston and two second air nozzles; The two second air nozzles are respectively arranged at the upper and lower ends of the second cylinder barrel, the second piston rod is passed through the second cylinder barrel, the second piston is installed on the second piston rod and is located inside the barrel of the second cylinder barrel, and the second punch is detachably installed on the lower part of the second piston rod.

4. A punching die assembly according to claim 3, characterized in that: A first limiting portion is provided on the top of the first piston rod, and the first limiting portion can be adjusted up and down along the first piston rod; A second limiting portion is disposed on the top of the second piston rod, and the second limiting portion can be adjusted up and down along the second piston rod.

5. A punching die assembly according to claim 4, characterized in that: Also includes a first spring, a first nut, a second spring and a second nut; The first nut is mounted on the top of the first punch rod, the first spring is sleeved on the rod body of the first punch rod, one end of the first spring abuts against the first nut, and the other end of the first spring abuts against the top of the first wheel sleeve; The second nut is installed on the top of the second punch rod, the second spring is sleeved on the rod body of the second punch rod, one end of the second spring abuts against the second nut, and the other end of the second spring abuts against the top of the second wheel sleeve.

6. A punching die assembly according to claim 2, characterized in that: The first punch rod is provided with a first flat key, the first wheel sleeve is provided with a vertical first key slot inside, the first flat key cooperates with the first key slot, and the first flat key moves up and down along the first key slot; The shaft of the second punch rod is provided with a second flat key, the interior of the second wheel sleeve is provided with a vertical second key slot, the second flat key cooperates with the second key slot, and the second flat key can move up and down along the second key slot.

7. A punching die assembly according to claim 2, characterized in that: It also includes a pressing cylinder, which can be installed and connected with the straight punching knife in an upward and downward movable manner. A through hole is provided at the bottom of the pressing cylinder, and the through hole is directly opposite to the punching end of the straight punching knife.

8. The punching die assembly according to claim 7, characterized in that: A third spring is arranged in the barrel of the press barrel, one end of the third spring abuts against the straight punch, and the other end of the third spring abuts against the bottom of the inner wall of the press barrel.

9. A punching die assembly according to any one of claims 2 to 8, characterized in that: The outer peripheral sleeves of the first wheel sleeve and the second wheel sleeve are provided with rolling bearings, and the rolling bearings are arranged in the mounting holes.

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