Toggle no-landing-edge stamping structure

Abstract

The invention discloses a toggle no-landing-edge punching structure, and relates to the technical field of punching machine mechanical equipment, the toggle no-landing-edge punching structure comprises an ejection module, a constraint buckle frame is arranged outside the ejection module, and a vertical buffer piece for limiting and buffering the axial movement of the ejection module is coaxially assembled in the constraint buckle frame; horizontal buffering pieces for limiting and buffering radial movement of the material ejecting module are further symmetrically assembled in the restraining buckle frame, the vertical buffering pieces can synchronously and axially move slightly along with vertical movement of the long connecting rod, the long connecting rod is divided into an upper independent movement section, a middle independent movement section and a lower independent movement section, stress of different parts is buffered in a segmented mode, and the buffering effect is good. Sudden change of force during axial movement of the long connecting rod is counteracted; and the horizontal buffer piece limits the radial deviation amplitude of the long connecting rod when the long connecting rod shakes in the radial direction due to unbalanced stress, so that the stability of the motion trail of the long connecting rod is ensured, the service life of parts is prolonged, and the transmission stability and precision of the material jacking device are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of punch press mechanical equipment, in particular to a toggle without flange stamping structure. BACKGROUND

[0002] The toggle without flange stamping structure in the prior art is applied to a BLKP cold forging toggle press, mainly used for efficient cold forging forming operation of metal workpieces such as steam engine parts, hand tools and gears, and its core structure adopts a collaborative design of "toggle transmission + no-flange material discharge die", which is adapted to material cold extrusion deformation through the low-speed high-pressure characteristics of the toggle mechanism near the lower dead point, and realizes no-flange stamping by matching the material discharge layout with the workpiece profile, and is suitable for high-batch cold forging, precision metal forming and other scenes.

[0003] However, the prior art still has the following defects in specific use: For the lower material ejecting device in the existing toggle press, the cam and the long connecting rod in the structure are in rigid sliding contact, and the length of the upper cam driving connecting rod is much longer than the connecting structure of the lower cam and the long connecting rod.

[0004] When the cam rotates with the crankshaft and other power components, the profile curvature of the cam has a sudden change point, and the pushing direction of the long connecting rod will change sharply with the rotation angle of the cam during pushing the long connecting rod, lacking smooth transition characteristics. At the same time, the long connecting rod is simply limited and constrained by the upper and lower cams, and under the driving of the curve force, the motion state is poor in stability, and the acceleration and speed frequently change suddenly. In addition, the friction force at the contact area between the cam and the long connecting rod will fluctuate greatly with the change of the pushing direction, especially at the position of the sudden change of the cam profile curvature, the friction force will increase instantaneously, resulting in uneven wear degree of the contact part, and the local area bears much more friction load than other areas, significantly accelerating the uneven wear process of the contact surface between the cam and the long connecting rod.

[0005] In the existing lower material ejecting device, the length of the upper cam driving connecting rod is much longer than the connecting structure of the lower cam and the long connecting rod, and both of them adopt rigid transmission design. When the cam rotates to drive the long connecting rod to move, the upper long connecting rod is prone to elastic deformation and movement delay during power transmission due to the longer force arm, forming a "time difference of force" compared with the relatively direct transmission of the lower part. At the same time, the cam profile is a conventional curve, and the pushing direction of the long connecting rod changes sharply with the sudden change of the profile curvature, while the long connecting rod lacks a buffering and adapting structure for the curve force, so that the upper and lower stress points of the long connecting rod produce additional torque due to the difference in force arm, and the stress direction is always unstable.

[0006] The two defects can jointly cause serious problems of the ejection device: on the one hand, the long connecting rod can be twisted and shaken in the movement due to unstable movement and unbalanced force, and the wear of the long connecting rod and surrounding components such as the cam and the limiting assembly can be significantly aggravated in long-term operation, and the stability and precision of the transmission can be seriously damaged; on the other hand, the ejection action of the ejection rod can be unable to accurately and smoothly eject the product from the tray due to the deviation, jamming and deviation of the movement track of the long connecting rod, which can cause product deformation and ejection position deviation, affect the ejection efficiency and quality, and even cause mechanical failures such as jamming of the long connecting rod, excessive wear and fracture of the cam or the long connecting rod, and force the equipment to stop for maintenance, which can not only greatly reduce the production efficiency, but also significantly increase the time cost and economic cost of equipment maintenance, and seriously interfere with the high-batch and continuous operation required by metal cold forging production.

[0007] Therefore, in view of the above, the present application provides an elbow no hemming stamping structure to make up for and improve the shortcomings of the prior art. SUMMARY

[0008] The present application provides an elbow no hemming stamping structure to solve the technical problems in the background art.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an elbow no hemming stamping structure, comprising an ejection module, an external constraint buckle frame is arranged on the ejection module, a vertical buffer is coaxially assembled inside the constraint buckle frame to limit and buffer the axial movement of the ejection module; a horizontal buffer is also symmetrically assembled inside the constraint buckle frame to limit and buffer the radial movement of the ejection module; through the synergistic effect of the vertical buffer and the horizontal buffer, the ejection module can adaptively buffer the sudden change of the driving force direction when working, and ensure the smoothness of the movement of the ejection module.

[0010] Further, a punch body is assembled on the side of the ejection module, the ejection module comprises a driving connecting rod, a long connecting rod and a cam piece; one end of the driving connecting rod is movably connected to the outer wall of the punch body by a hinged manner, and the other end is movably connected to the top end of the long connecting rod; the bottom end of the long connecting rod is connected to the cam piece by a sliding fit manner, and the driving connecting rod can drive the long connecting rod to make up-and-down reciprocating movement when operating, so as to ensure the cyclic execution of the ejection action.

[0011] Further, the vertical buffer comprises an upper sleeve, an elastic rubber column and a lower sleeve from top to bottom along the axial direction, and the three are coaxially assembled and located inside the constraint buckle frame.

[0012] Further, the long connecting rod penetrates through the vertical buffer, and the vertical buffer divides the long connecting rod inside the constraint buckle frame into three independent movement segments, i.e. upper, middle and lower segments, so as to ensure the segmented buffering of different parts of the long connecting rod.

[0013] Further, the upper and lower ends of the elastic rubber column are equipped with elastic bushings; the elastic bushing above the elastic rubber column is fixedly connected with the lower surface of the upper sleeve at the top end; the elastic bushing below the elastic rubber column is fixedly connected with the upper surface of the lower sleeve at the bottom end; and the inner diameter and the outer diameter of the upper elastic bushing are both larger than the corresponding diameters of the lower elastic bushing, so as to adapt to the working condition requirement that the upper part of the long connecting rod bears more force.

[0014] Further, the horizontal buffer includes at least two groups of bearing bases which are uniformly distributed along the four corners of the inner wall of the constraint buckle frame and are fixedly connected with the inner wall of the constraint buckle frame to form a stable mounting base.

[0015] Further, a spring pull ring is installed inside each bearing base; the spring pull ring in the upper region of the constraint buckle frame is fixedly connected with the outer wall of the upper sleeve at the end away from the bearing base; the spring pull ring in the lower region of the constraint buckle frame is fixedly connected with the outer wall of the lower sleeve at the end away from the bearing base, and the elastic tension of the spring pull ring limits the radial displacement of the vertical buffer and controls the radial shaking of the long connecting rod during movement.

[0016] Further, the outer part of the vertical buffer is symmetrically equipped with a centering adjusting member, which includes an external sleeve ring fixedly connected with the inner wall of the constraint buckle frame and coaxially arranged with the vertical buffer.

[0017] Further, the inner wall of the external sleeve ring is uniformly fixedly connected with annular magnets in the circumferential direction, and the outer wall of the vertical buffer is fixedly connected with rectangular magnetic strips at positions corresponding to the annular magnets.

[0018] Further, the same magnetic poles of the annular magnets and the rectangular magnetic strips on the side close to each other are the same, and the magnetic force of repulsion of the same poles is used to real-time correct the coaxiality of the vertical buffer and control the long connecting rod to always move in the axial direction.

[0019] Compared with the prior art, the beneficial effects of the present application are: (1) The device effectively solves the problems of unstable movement and unbalanced stress of the long connecting rod in the existing technology through the synergistic effect of the vertical buffer and the horizontal buffer. The vertical buffer can move axially with the up-down movement of the long connecting rod, which divides the long connecting rod into three independent movement sections, i.e., upper, middle and lower sections, and buffers the stress of different parts, avoiding local stress concentration and sudden force change during the axial movement of the long connecting rod, preventing movement jamming. When the long connecting rod moves radially due to unbalanced stress, the horizontal buffer uses the elastic tension of the spring ring to pull the vertical buffer back to the initial coaxial position, limiting the radial deviation and ensuring the stability of the long connecting rod movement trajectory, reducing the friction and wear between the long connecting rod and other components, prolonging the service life of the components, and significantly improving the transmission stability and precision of the ejection device.

[0020] During actual operation, the elastic rubber column as the intermediate connecting section of the vertical buffer, when the long connecting rod moves upward, the upper elastic bushing of the elastic rubber column is slightly compressed, and the elastic rubber column deforms axially to absorb the impact force of the upper part of the long connecting rod. When the long connecting rod moves downward, the lower elastic bushing of the elastic rubber column is compressed, and the elastic rubber column deforms reversely to buffer the force of the lower part of the long connecting rod. This bidirectional elastic deformation capability allows the elastic rubber column to respond to the stress in different directions during the upward and downward movement of the long connecting rod, further enhancing the buffering effect and making the movement of the long connecting rod more stable and smooth, while effectively relieving the impact between the long connecting rod and other components and protecting the device structure.

[0021] (2) During the movement of the ejection module, when moving from top to bottom, the power of the long connecting rod comes from the downward action of the driving connecting rod, its own gravity and inertia, and the reaction force of the cam at the bottom end. The lower part of the long connecting rod moves first, driving the lower sleeve to move slightly downward. At this time, the lower elastic bushing is compressed, and the elastic rubber column deforms reversely to buffer the force of the lower part of the long connecting rod, avoiding excessive impact on the lower part of the long connecting rod due to sudden stress and ensuring the stability of the downward movement of the long connecting rod.

[0022] When moving from bottom to top, the power input of the long connecting rod comes from the driving connecting rod at the top end. The upper part of the long connecting rod moves first, driving the upper sleeve to move slightly upward. The upper elastic bushing is slightly compressed, and the elastic rubber column deforms axially to absorb the impact force of the upper part of the long connecting rod, preventing the upper part of the long connecting rod from moving suddenly or causing severe impact on other components. When stressed in different directions, the elastic bushing can adapt to the stress direction and size through its compression or expansion, further optimizing the buffering effect and ensuring the stability and smoothness of the long connecting rod during the entire movement cycle, ensuring the efficient execution of the ejection action.

[0023] (3) The vertical buffer is assisted by magnetic force to realize real-time correction of the coaxiality of the vertical buffer, the annular magnet in the inner wall of the outer sleeve generates a stable magnetic field, when the vertical buffer moves with the long connecting rod and a slight coaxiality deviation occurs, the rectangular magnetic strip on the outer wall of the vertical buffer will approach the annular magnet on the corresponding side, since the magnetic poles of the annular magnet and the rectangular magnetic strip on the side close to each other are the same, a magnetic force of repulsion is generated, which pushes the vertical buffer to deviate away from the annular magnet until the coaxial state is restored; this magnetic correction method without mechanical contact has fast response speed, can correct slight coaxiality deviation in time, ensures that the long connecting rod always moves in the axial direction, improves the precision of the ejection action, avoids the deviation of the product ejection position caused by the deviation of the long connecting rod, well adapts to the high requirement of cold forging on product precision, and also avoids the additional friction and wear caused by mechanical contact correction, further ensures the stable operation and service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view plane structure schematic diagram of the application; Figure 2 It is a side view plane structure schematic diagram of the application; Figure 3 It is a driving assembly plane structure schematic diagram of the application; Figure 4 It is a driving assembly three-dimensional structure schematic diagram of the application; Figure 5 It is a ejection module plane structure schematic diagram of the application; Figure 6 It is a constraint buckle frame internal plane structure schematic diagram of the application; Figure 7 It is a constraint buckle frame internal three-dimensional structure schematic diagram of the application; Figure 8 It is a centering adjusting part internal three-dimensional structure schematic diagram of the application; Figure 9 It is an explosion diagram of the vertical buffer and the like structure of the application; Figure 10 It is an explosion diagram of the horizontal buffer and the like structure of the application.

[0025] The figure mark is: 1, punch main body; 2, ejection module; 21, driving connecting rod; 22, long connecting rod; 23, cam part; 31, constraint buckle frame; 32, vertical buffer; 321, upper sleeve; 322, elastic rubber column; 323, lower sleeve; 324, elastic bushing; 33, horizontal buffer; 331, bearing base; 332, spring ring; 34. Centering adjustment member; 341. Outer collar; 342. Annular magnet; 343. Rectangular magnetic strip. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without any creative work fall within the protection scope of the present application. Embodiment 1 Please refer to Figure 1 - Figure 6 As shown in the figure, a toggle no-flange stamping structure includes a material ejecting module 2, the outside of the material ejecting module 2 is provided with a constraint buckle frame 31, the inside of the constraint buckle frame 31 is coaxially assembled with a vertical buffer 32 for limiting and buffering the axial movement of the material ejecting module 2; the inside of the constraint buckle frame 31 is also symmetrically assembled with a horizontal buffer 33 for limiting and buffering the radial movement of the material ejecting module 2; through the synergistic effect of the vertical buffer 32 and the horizontal buffer 33, the material ejecting module 2 can adaptively buffer the sudden change of the driving force direction when working, offset the sudden change of the force direction, and ensure the smoothness of the movement of the material ejecting module 2.

[0027] It should be noted that the side of the material ejecting module 2 is assembled with a punch body 1, the material ejecting module 2 includes a driving connecting rod 21, a long connecting rod 22 and a cam member 23; one end of the driving connecting rod 21 is movably connected to the outer wall of the punch body 1 in a hinged manner, the other end is movably connected to the top end of the long connecting rod 22; the bottom end of the long connecting rod 22 is connected to the cam member 23 in a sliding fit manner, the driving connecting rod 21 can drive the long connecting rod 22 to make up-and-down reciprocating movement when operating, and ensure the cyclic execution of the material ejecting action.

[0028] Specifically, the operation of the ejection module 2 is closely related to the power transmission of the punch body 1, and the core is achieved through the "linkage driving-cam linkage" mode to complete the cyclic execution of the ejection action. When the punch body 1 starts to operate, it will drive the driving link 21 to move. One end of the driving link 21 is fixed to the outer wall of the punch body 1 through a hinged manner. This hinge point becomes the fulcrum of the driving link 21 movement, so that the driving link 21 can swing around the hinge point. Since the other end of the driving link 21 is in a movable connection with the top end of the long link 22, when the driving link 21 swings around the hinge point, it will drive the long link 22 to produce reciprocating movement in the up-down direction through the movable connection. The bottom end of the long link 22 and the cam piece 23 are connected in a sliding fit manner. During the up-down reciprocating movement of the long link 22, the cam piece 23 is further driven to move synchronously. In the whole movement transmission process, the up-down reciprocating movement of the long link 22 is directly applied to the ejection-related execution components, and under the driving of the long link 22, the cyclic action of "ejecting the product-resetting and waiting" is ensured to be completed.

[0029] Please refer to Figure 6 - Figure 8 As shown in the figure, the vertical buffer 32 includes an upper sleeve 321, an elastic rubber column 322 and a lower sleeve 323 from top to bottom along the axial direction, and the three are coaxially assembled and located inside the constraint buckle frame 31.

[0030] It should be noted that the long link 22 penetrates the vertical buffer 32, and the vertical buffer 32 divides the long link 22 inside the constraint buckle frame 31 into three independent movement sections, upper, middle and lower, to ensure segmented buffering of different parts of the long link 22. The upper and lower end faces of the elastic rubber column 322 are both equipped with elastic bushings 324; the top end of the elastic bushing 324 above the elastic rubber column 322 is fixedly connected with the lower surface of the upper sleeve 321; the bottom end of the elastic bushing 324 below the elastic rubber column 322 is fixedly connected with the upper surface of the lower sleeve 323; and the inner diameter and outer diameter of the upper elastic bushing 324 are both larger than the corresponding diameters of the lower elastic bushing 324, to adapt to the working condition requirement that the upper part of the long link 22 bears more force.

[0031] Please refer to Figure 6 - Figure 10As shown, the horizontal buffer 33 includes at least two sets of bearing bases 331. The bearing bases 331 are evenly distributed along the four corners of the inner wall of the constraint frame 31, and each bearing base 331 is fixedly connected to the inner wall of the constraint frame 31 to form a stable installation base. Each bearing base 331 has a spring pull ring 332 installed inside. The spring pull ring 332 located in the upper region of the constraint frame 31 has its end away from the bearing base 331 fixedly connected to the outer wall of the upper sleeve 321. The spring pull ring 332 located in the lower region of the constraint frame 31 has its end away from the bearing base 331 fixedly connected to the outer wall of the lower sleeve 323. The elastic tension of the spring pull ring 332 restricts the radial displacement of the vertical buffer 32 and controls the radial swaying when the long connecting rod 22 moves.

[0032] During the operation of the top material module 2, the vertical buffer 32 and the horizontal buffer 33 achieve buffering and limiting through coordinated movement. The specific process and state are as follows: It is worth noting that in the vertical buffer 32, the upper sleeve 321, the elastic rubber column 322, and the lower sleeve 323 move slightly axially in sync with the up and down movement of the long connecting rod 22. At the same time, the long connecting rod 22 passes through the vertical buffer 32 and is divided into three independent movement segments: upper, middle, and lower. The force on each movement segment is dispersed through the corresponding buffer structure to avoid local stress concentration.

[0033] It should be noted that in the top material module 2, the power input of the long connecting rod 22 comes from the drive connecting rod 21 at the top. When the drive connecting rod 21 drives the long connecting rod 22 to move upward, the power is first applied to the upper part of the long connecting rod 22, that is, the connection part between the long connecting rod 22 and the drive connecting rod 21. At this time, the upper part of the long connecting rod 22 first obtains the upward driving force, which in turn drives the upper sleeve 321 that cooperates with it to move upward slightly in sync. Since the transmission of force takes time and the long connecting rod 22 has a certain "elastic deformation and motion inertia", the lower part will lag behind the movement of the upper part for a short time. Therefore, the upper part is subjected to force first and begins to move, and then the force is gradually transmitted to the lower part. Therefore, when moving upward, the state of "the upper part is subjected to force first, which drives the upper sleeve 321 to move upward slightly" is presented.

[0034] The downward movement of the long connecting rod 22 is driven by two factors: first, the "downward pull" of the driving connecting rod 21, and second, the "gravity and inertia" of the long connecting rod 22 itself. More importantly, the bottom end of the long connecting rod 22 slides in conjunction with the cam component 23. The contour of the cam component 23 will generate a "supporting and pushing" reaction force on the bottom end of the long connecting rod 22. When the long connecting rod 22 moves downward, the lower region is first subjected to the reaction force of the cam component 23. This force will first drive the lower region and the matching lower sleeve 323 to move slightly downward. Subsequently, the force is gradually transmitted upward, driving the upper region to move. Therefore, the downward movement presents a state of "the lower region is subjected to force first, driving the lower sleeve 323 to move slightly downward".

[0035] In short: When moving upward, the upper part is the starting point of power input, so it is the first to be subjected to force; when moving downward, the lower part is the key part that interacts with the cam, so it is the first to be subjected to force. This sequence is not absolutely asynchronous, but rather the starting point and dominant area of ​​the force are different. Ultimately, this manifests as a slight difference in whether the upper part moves first (upward) or the lower part moves first (downward) when the sleeves at different positions move with the long connecting rod 22. This allows the elastic rubber column 322 to specifically buffer forces in different directions.

[0036] Specifically, when the long connecting rod 22 moves upward, its upper region is subjected to force first, causing the upper sleeve 321 to move slightly upward. The elastic bushing 324 (upper bushing) below the upper sleeve 321 is slightly compressed, and the elastic rubber column 322 undergoes axial deformation to absorb the impact force of the upper part of the long connecting rod 22. When the long connecting rod 22 moves downward, its lower region is subjected to force, causing the lower sleeve 323 to move slightly downward. The lower elastic bushing 324 is compressed, and the elastic rubber column 322 deforms in the opposite direction to buffer the force of the lower part of the long connecting rod 22.

[0037] In the horizontal buffer 33, the bearing base 331 is fixed to the inner wall of the constraint buckle frame 31 and remains stationary. When the long connecting rod 22 causes radial swaying due to force imbalance, it will drive the vertical buffer 32 to move radially in sync. At this time, the spring pull ring 332 connected to the upper sleeve 321 and the lower sleeve 323 is stretched or compressed. The elastic tension of the spring pull ring 332 will act in the opposite direction on the vertical buffer 32, pulling it back to the initial coaxial position and limiting the radial displacement amplitude.

[0038] The vertical buffer 32 offsets the sudden changes in force during the axial movement of the long connecting rod 22 through segmented buffering and elastic deformation, thus preventing movement jamming; the horizontal buffer 33 limits radial sway through spring tension, ensuring the stability of the long connecting rod 22's movement trajectory, reducing friction and wear between the long connecting rod 22 and the cam 23 and the constraint buckle frame 31, and extending the component's lifespan.

[0039] Please refer to Figure 6 - Figure 10 As shown, a centering adjustment component 34 is symmetrically assembled on the outside of the vertical buffer component 32. The centering adjustment component 34 includes an outer collar 341, which is fixedly connected to the inner wall of the constraint buckle frame 31. The outer collar 341 is coaxially arranged with the vertical buffer component 32. Annular magnets 342 are uniformly fixedly connected to the inner wall of the outer collar 341 along the circumferential direction. Rectangular magnetic strips 343 are fixedly connected to the outer wall of the vertical buffer component 32 at positions corresponding to the annular magnets 342.

[0040] It should be noted that the magnetic poles of the ring magnet 342 and the rectangular magnetic strip 343 are the same on the side that are close to each other. Through the magnetic force of like poles repelling each other, the coaxiality of the vertical buffer 32 is corrected in real time, and the long connecting rod 22 is controlled to always move along the axial direction.

[0041] When the top material module 2 is running, the centering adjustment component 34 corrects the coaxiality of the vertical buffer component 32 in real time through magnetic force. Its movement process and state are as follows: Specifically, the outer collar 341 is fixed to the inner wall of the constraint frame 31 and remains stationary, while the annular magnet 342 on its inner wall always generates a stable magnetic field. When the vertical buffer 32 moves with the long connecting rod 22, if there is a slight coaxiality deviation (such as bias to one side), the rectangular magnetic strip 343 on the outer wall of the vertical buffer 32 will approach the annular magnet 342 on the corresponding side. Since the magnetic poles of the annular magnet 342 and the rectangular magnetic strip 343 are the same on the side they approach, they will generate a magnetic force that repels each other. This repulsive force will push the vertical buffer 32 in the opposite direction, causing it to shift away from the annular magnet 342, until the vertical buffer 32 returns to the coaxial state with the outer collar 341. During the entire up-and-down reciprocating motion of the long connecting rod 22, this process of "offset-repulsive force correction-reset" continues to occur dynamically. The rectangular magnetic strip 343 moves synchronously with the slight movement of the vertical buffer 32, and the magnetic field of the annular magnet 342 remains stable.

[0042] Its auxiliary advantages are: coaxiality correction can be achieved without mechanical contact, avoiding additional friction and wear; the real-time dynamic magnetic correction has a fast response speed, which can correct small coaxiality deviations in time, ensuring that the long connecting rod 22 always moves along the axial direction, further improving the accuracy of the ejection action, avoiding product ejection position deviation caused by the offset of the long connecting rod 22, and adapting to the high requirements of cold forging for product precision.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A toggle-joint stamping structure without overlap, comprising an ejector module (2), characterized in that: The top material module (2) is provided with a constraint buckle frame (31) on the outside. The constraint buckle frame (31) is coaxially equipped with a vertical buffer (32) to limit and buffer the axial movement of the top material module (2). The constraint buckle frame (31) is also symmetrically equipped with a horizontal buffer (33) to limit and buffer the radial movement of the top material module (2). Through the synergistic effect of the vertical buffer (32) and the horizontal buffer (33), the top material module (2) adapts to the change in the direction of the driving force when working, buffers and cancels the sudden change in the direction of the force, and ensures the smoothness of the movement of the top material module (2).

2. The elbow-joint stamping structure according to claim 1, characterized in that: The side of the ejector module (2) is equipped with the punch body (1). The ejector module (2) includes a drive link (21), a long link (22) and a cam (23). One end of the drive link (21) is movably connected to the outer wall of the punch body (1) by a hinge, and the other end is movably connected to the top of the long link (22). The bottom end of the long link (22) is connected to the cam (23) by a sliding fit. When the drive link (21) is running, it can drive the long link (22) to move up and down reciprocally to ensure the cyclic execution of the ejector action.

3. The elbow-joint stamping structure according to claim 1, characterized in that: The vertical buffer (32) includes, from top to bottom, an upper sleeve (321), an elastic rubber column (322) and a lower sleeve (323) along the axial direction. The three are coaxially assembled and are all located inside the constraint buckle frame (31).

4. The elbow-joint stamping structure according to claim 2, characterized in that: The long connecting rod (22) passes through the vertical buffer (32), and the vertical buffer (32) divides the long connecting rod (22) inside the constraint buckle frame (31) into three independent movement segments: upper, middle and lower, to ensure segmented buffering of different parts of the long connecting rod (22).

5. The elbow-joint stamping structure according to claim 3, characterized in that: The upper and lower ends of the elastic rubber column (322) are equipped with elastic bushings (324); the top end of the elastic bushing (324) located above the elastic rubber column (322) is fixedly connected to the lower surface of the upper sleeve (321); the bottom end of the elastic bushing (324) located below the elastic rubber column (322) is fixedly connected to the upper surface of the lower sleeve (323); and the inner and outer diameters of the upper elastic bushing (324) are larger than the corresponding diameters of the lower elastic bushing (324) to adapt to the working conditions where the upper part of the long connecting rod (22) is subjected to greater force.

6. The elbow-joint stamping structure according to claim 1, characterized in that: The horizontal buffer (33) includes at least two sets of bearing bases (331), which are evenly distributed along the four corners of the inner wall of the constraint frame (31), and each bearing base (331) is fixedly connected to the inner wall of the constraint frame (31).

7. The elbow-joint stamping structure according to claim 6, characterized in that: Each of the bearing bases (331) is equipped with a spring pull ring (332). The spring pull ring (332) located in the upper region of the constraint buckle frame (31) has its end away from the bearing base (331) fixedly connected to the outer wall of the upper sleeve (321). The spring pull ring (332) located in the lower region of the constraint buckle frame (31) has its end away from the bearing base (331) fixedly connected to the outer wall of the lower sleeve (323). The elastic tension of the spring pull ring (332) restricts the radial displacement of the vertical buffer (32) and controls the radial swaying of the long connecting rod (22) when it moves.

8. The elbow-joint stamping structure according to claim 1, characterized in that: The vertical buffer (32) is symmetrically equipped with a centering adjustment component (34), which includes an outer collar (341). The outer collar (341) is fixedly connected to the inner wall of the constraint buckle frame (31), and the outer collar (341) is coaxially arranged with the vertical buffer (32).

9. The elbow-joint stamping structure according to claim 8, characterized in that: The inner wall of the outer collar (341) is uniformly fixedly connected with an annular magnet (342) along the circumferential direction, and the outer wall of the vertical buffer (32) is fixedly connected with a rectangular magnetic strip (343) at the position corresponding to the annular magnet (342).

10. The elbow-joint stamping structure according to claim 9, characterized in that: The annular magnet (342) and the rectangular magnetic strip (343) have the same magnetic poles on the side that are close to each other. Through the magnetic force of repulsion between like poles, the coaxiality of the vertical buffer (32) is corrected in real time, and the long connecting rod (22) is controlled to always move along the axial direction.

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