Adjustable back pass trim ejection mechanism

Abstract

The application relates to an adjustable back-through trimming and ejecting mechanism. By integrating the ejecting and trimming functions in a mechanism composed of a driving rocker arm and a trimming rocker arm, the overall structure is simplified, and the equipment space occupation and manufacturing cost are effectively reduced. Meanwhile, the mechanism directly changes the geometric angle of the trimming rocker arm through a telescopic rod, so that the adjustment of the trimming action timing is more intuitive, convenient and has a larger range. The mechanism is free from the restriction that the actions are coupled with each other and difficult to adjust in the traditional compound lever mechanism, and the response speed and process adaptability during production change are improved.

Description

Technical Field

[0001] This application relates to the field of forging machinery technology, and in particular to an adjustable rear through-cutting ejection mechanism. Background Technology

[0002] In the cold heading process of fasteners such as flange nuts and irregularly shaped parts, in addition to the ejection action that pushes the workpiece out of the main mold, a separate trimming or secondary ejection action is often required to remove burrs or complete more complex internal hole forming. Typically, these two ejection actions need to be precisely coordinated in terms of timing and stroke.

[0003] The common approach is to set up two independent ejection systems side by side at the rear of the machine. One system is responsible for the main ejection, and the other is responsible for the edge ejection. Each system has its own independent drive cam, lever, and transmission chain. Although this approach has a clear function, the coexistence of two complete mechanisms makes the structure at the rear of the machine extremely complex and large, increasing the size and weight of the entire machine and doubling the number of parts, resulting in high manufacturing and assembly costs. At the same time, both systems require independent maintenance, resulting in many points of failure and a large workload for maintenance. Utility Model Content

[0004] To address the aforementioned issues, this application provides an adjustable rear-through cutting edge ejection mechanism with a simplified structure, enabling intuitive and convenient adjustment of the cutting edge timing.

[0005] To achieve the above objectives, the adjustable rear through-cut edge ejection mechanism designed in this application, applied to a cold heading machine, includes: The main shaft is horizontally mounted on the body of the cold heading machine; An ejector rocker arm is provided, the middle part of which is pivotally connected to the main shaft, and the upper part of the ejector rocker arm is used to drive a push rod assembly. A drive swing arm, which acts on the lower part of the drive swing arm, to drive the drive swing arm to swing back and forth around the axis of the main shaft; A cutting-edge rocker arm, the middle part of which is pivotally connected to the main shaft; A cam bar, which is mounted on the drive rocker arm and acts on the lower part of the cutting rocker arm, is used to drive the cutting rocker arm to reciprocate around the axis of the main shaft. The ejection timing of the cutting edge rocker arm is different from that of the driving rocker arm; the cutting edge rocker arm includes a first arm, a second arm and a telescopic rod arranged at an angle, the distal end of the first arm is used to drive a push rod assembly, and the distal end of the second arm is in contact with the contour surface of the cam bar; the two ends of the telescopic rod are respectively pivotally connected to the first arm and the second arm, and the angle between the first arm and the second arm can be changed by adjusting the length of the telescopic rod.

[0006] Preferably, the first arm is provided with a first bracket, and the second arm is provided with a second bracket at a position corresponding to the first bracket. The telescopic rod is a threaded telescopic rod with both ends pivotally connected to the first bracket and the second bracket, respectively.

[0007] Preferably, a roller is pivotally connected to the distal end of the second arm, and the cam bar has a profile surface that provides a preset guide path, with the wheel surface of the roller contacting the profile surface of the cam bar.

[0008] Preferably, a reset device is provided between the front side of the first arm and the body of the cold heading machine. The reset device acts on the first arm to provide a continuous reset force opposite to the ejection direction, so that the edge-cutting rocker arm returns to the initial position after completing the ejection action.

[0009] Preferably, the reset device includes a spring core rod, a spring seat, and a pin. One end of the spring core rod is fixed to the cold heading machine body through the spring seat. A recess is provided on the front side of the first arm that is opposite to the spring seat. The other end of the spring core rod extends into the recess and is fixed to the front side of the first arm through the pin.

[0010] Preferably, the drive arm has a groove adapted to the cam bar, and the cam bar is detachably installed in the groove by fasteners.

[0011] Preferably, the cam bar has an exposed portion located outside the groove, and a through hole is formed in the exposed portion. The fastener is a pressure plate that passes through the through hole, and the two ends of the pressure plate extending out of the through hole are respectively fixed to the drive swing arm by screws.

[0012] The adjustable rear-through trimming ejection mechanism designed in this application integrates the trimming and ejection functions into a single mechanism consisting of a drive rocker arm and a trimming rocker arm, simplifying the overall structure and effectively reducing equipment space occupation and manufacturing costs. Simultaneously, this mechanism directly changes the geometric angle of the trimming rocker arm itself via a telescopic rod, making the adjustment of the trimming action sequence more intuitive, convenient, and with a wider range. This overcomes the limitations of traditional composite lever mechanisms where various actions are coupled and adjustments are difficult, improving response speed and process adaptability during production changeovers. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the adjustable rear through-cut edge ejection mechanism provided in the embodiments of this application.

[0014] Figure 2 yes Figure 1 A three-dimensional exploded view.

[0015] Figure 3This is a schematic diagram of the planar structure of the adjustable rear through-cut edge ejection mechanism provided in the embodiments of this application.

[0016] Figure 4 This is a three-dimensional structural schematic diagram of the adjustable rear through-cut edge ejection mechanism provided in the embodiments of this application from another perspective.

[0017] Figure 5 This is an assembly diagram of the adjustable rear through-cut edge ejection mechanism provided in the embodiments of this application. The components include: body 100, push rod assembly 200, main shaft 10, push-out rocker arm 20, drive swing arm 30, groove 31, fastener 32, drive shaft 33, trimming rocker arm 40, first arm 41, first bracket 411, recess 412, second arm 42, second bracket 421, telescopic rod 43, roller 44, cam strip 50, through hole 51, reset device 60, spring core rod 61, spring seat 62, pin 63, and connecting rod 70. Detailed Implementation

[0018] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0019] like Figures 1 to 5 As shown, the adjustable rear-end trimming ejection mechanism described in this embodiment is used to mount on a cold heading machine to collaboratively complete the ejection and trimming actions. Figures 1 to 5 As shown, the mechanism mainly includes a main shaft 10, an ejector rocker arm 20, a drive rocker arm 30, a trimming rocker arm 40, and a cam bar 50.

[0020] Specifically, the main shaft 10 is horizontally and fixedly mounted on the body 100 of the cold heading machine to provide a stable reference rotation center for ejecting the rocker arm 20 and driving the movement of the swing arm 30.

[0021] like Figure 1 , Figure 4As shown, the drive chain for the main ejection action is powered by an independent drive shaft 33, which is also horizontally mounted on the machine body 100. This drive shaft 33 is driven by the main drive system (not shown) of the cold heading machine to reciprocate synchronously. The drive arm 30 is securely fixed to the drive shaft 33 via clamping or keying. The middle part of the ejection arm 20 is rotatably pivotally connected to the main shaft 10. A connecting rod 70 connects the two, with one end pivotally connected to the drive arm 30 and the other end pivotally connected to the lower part of the ejection arm 20. Through this arrangement, the drive arm 30, connecting rod 70, ejection arm 20, and the machine body 100 components together constitute a highly efficient four-bar linkage. When the drive shaft 33 swings, power is smoothly transmitted through this four-bar linkage, driving the ejection arm 20 to reciprocate around the main shaft 10. The upper part of the ejection arm 20 then drives a push rod assembly 200, completing the main ejection action. This design replaces the traditional large disc cam with a compact connecting rod, simplifying the structure and reducing costs.

[0022] like Figure 1 , Figure 3 , Figure 4 As shown, a cam strip 50 is fixedly installed on the side or lower part of the ejector rocker arm 20. The cam strip 50 has a preset specific contour surface. At the corresponding position on the lower part of the trimming rocker arm 40, a roller 44 is installed. When the drive rocker arm 30 swings, the cam strip 50 on it pushes the roller on the trimming rocker arm 40, thereby causing the trimming rocker arm 40 to swing around the main shaft 10 in a specific pattern. Its upper part drives another push rod assembly to complete the trimming action. Since the contour of the cam strip 50 is non-linear, the timing of the trimming action and the timing of the main ejection action can be preset to differ.

[0023] The cutting rocker arm 40 is not a single rigid component, but rather comprises a first arm 41, a second arm 42, and a telescopic rod 43 arranged at an angle. The distal end of the first arm 41 drives a push rod assembly 200, and the distal end of the second arm 42 contacts the contour surface of the cam strip 50. The two ends of the telescopic rod 43 are pivotally connected to the first arm 41 and the second arm 42, respectively. By adjusting the length of the telescopic rod 43, the angle between the first arm 41 and the second arm 42 can be changed. In this embodiment, the telescopic rod 43 is a threaded telescopic rod.

[0024] During production changes or process adjustments, operators can change the effective length of the telescopic rod 43 by rotating the adjusting nut. When the telescopic rod 43 extends or retracts, it forces the first arm 41 and the second arm 42 to rotate around their common pivot, the main shaft 10, thereby changing the angle between them. This change in angle directly affects the relative positional relationship between the upper part of the trimming rocker arm 40 and the top rod assembly 200, and between the lower part of the trimming rocker arm 40 and the drive rocker arm 30. This allows for convenient and intuitive changes to the starting timing, stroke, or lifting height of the trimming action simply by adjusting the telescopic rod 43, while keeping the motion patterns of the drive rocker arm 20 and the cam bar 50 constant. This enables independent adjustment of the trimming sequence. During operation, the drive arm 30 drives the rocker arm 20 to swing, and its upper part completes the main ejection action; at the same time, the cam bar 50 on the drive arm 30 drives the trimming rocker arm 40 to swing, and the upper part of the trimming rocker arm 40 completes the precise trimming action according to the angle that has been adjusted by the first arm 41 and the second arm 42.

[0025] In some embodiments, such as Figure 1 , Figure 3 As shown, a first bracket 411 is integrally protruding from the side of the first arm 41, and correspondingly, a second bracket 421 is integrally protruding from the side of the second arm 42 at the position corresponding to the first bracket 411. Thus, the first bracket 411 and the second bracket 421 provide a connecting base with a certain lever arm for the telescopic rod 43. Both ends of the telescopic rod 43 are rotatably pivotally connected to the first bracket 411 and the second bracket 421 via pins or ball joints, respectively. In this way, the pushing and pulling force of the telescopic rod 43 can be effectively applied to the two arms, achieving precise adjustment of the angle between them. At the same time, the brackets avoid interference with the main structure of the arms, making the overall structure more rational and robust.

[0026] In some embodiments, such as Figure 2 As shown, roller 44 is pivotally connected to the distal end of the second arm 42. The cam bar 50 has a profile surface that provides a preset guide path. The wheel surface of roller 44 contacts the profile surface of cam bar 50 to provide a preset guide path for the movement of the trimming rocker arm 40. Compared with sliding friction, rolling contact has advantages such as low friction, low wear, and high transmission efficiency. It can ensure smooth and precise motion transmission even in long-term, high-speed reciprocating motion, and effectively extend the service life of the contact components.

[0027] In some embodiments, such as Figure 1 , Figure 3 , Figure 4As shown, a reset device 60 is provided between the front side of the first arm 41 and the cold heading machine body 100. The reset device 60 acts on the first arm 41 to provide a continuous reset force opposite to the ejection direction, so that the trimming rocker arm 40 returns to its initial position after completing the ejection action. The reset device 60 continuously applies a reset force opposite to the ejection direction to the first arm 41. This force not only ensures that the trimming rocker arm 40 can accurately return to its initial position after the driving force is removed, but also provides a preload force to the roller 44 at the lower part of the trimming rocker arm against the profile surface of the cam strip 50 during the movement, ensuring that the two fit tightly and avoiding jumping due to high-speed movement.

[0028] Specifically, such as Figure 4 As shown, the reset device 60 includes a spring core rod 61, a spring seat 62, and a pin 63. During installation, the spring seat 62 is firmly fixed to the body 100, serving as the fixed base for the entire reset device. Correspondingly, a recess 412 is machined on the front side of the first arm 41. One end of the spring core rod 61 is connected to the spring seat 62, and the other end extends into the recess 412. A pin 63 passes through a pre-set pin hole on the first arm 41 and a rod end hole of the spring core rod 61, reliably connecting the two together. This design makes the application of the reset force direct and effective, and the structure is simple and easy to maintain.

[0029] In some embodiments, such as Figure 2 As shown, the drive rocker arm 30 has a groove 31 that matches the cam bar 50, and the cam bar 50 is detachably installed in the groove 31 by fasteners 32. This allows for easy replacement of cam bars with different profiles according to different product process requirements, further improving the adjustable range.

[0030] To achieve a secure and removable fixation, such as Figure 2 As shown, the cam bar 50 has an exposed portion outside the groove 31, and a through hole 51 is formed in the exposed portion. The fastener 32 is a pressure plate that passes through the through hole 51. The two ends of the pressure plate extending out of the through hole 51 are respectively fixed to the drive rocker arm 30 by screws. In this way, the pressure plate applies a strong clamping force to the exposed portion of the cam bar 50, firmly pressing it into the groove 31. When the cam bar needs to be replaced, simply loosen the screws at both ends, remove the pressure plate, and the old cam bar 50 can be easily removed and replaced with a new one. The whole process is quick and convenient.

[0031] The adjustable rear-through trimming ejection mechanism provided in this application integrates the trimming and ejection functions into a single mechanism consisting of a drive rocker arm and a trimming rocker arm, simplifying the overall structure and effectively reducing equipment space occupation and manufacturing costs. Simultaneously, this mechanism directly changes the geometric angle of the trimming rocker arm itself via a telescopic rod, making the adjustment of the trimming action sequence more intuitive, convenient, and with a wider range. This overcomes the limitations of traditional composite lever mechanisms where various actions are coupled and adjustments are difficult, improving response speed and process adaptability during production changeovers.

[0032] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adjustable rear through-cut edge ejection mechanism, applied to a cold heading machine, characterized in that, include: The main shaft is horizontally mounted on the body of the cold heading machine; An ejector rocker arm is provided, the middle part of which is pivotally connected to the main shaft, and the upper part of the ejector rocker arm is used to drive a push rod assembly. A drive swing arm, which acts on the lower part of the drive swing arm, to drive the drive swing arm to swing back and forth around the axis of the main shaft; A cutting-edge rocker arm, the middle part of which is pivotally connected to the main shaft; A cam bar, which is mounted on the drive rocker arm and acts on the lower part of the cutting rocker arm, is used to drive the cutting rocker arm to reciprocate around the axis of the main shaft. The ejection timing of the cutting edge rocker arm is different from that of the driving rocker arm; the cutting edge rocker arm includes a first arm, a second arm and a telescopic rod arranged at an angle, the distal end of the first arm is used to drive a push rod assembly, and the distal end of the second arm is in contact with the contour surface of the cam bar; the two ends of the telescopic rod are respectively pivotally connected to the first arm and the second arm, and the angle between the first arm and the second arm can be changed by adjusting the length of the telescopic rod.

2. The adjustable rear through-cut edge ejection mechanism according to claim 1, characterized in that, The first arm has a first bracket protruding from it, and the second arm has a second bracket protruding from it at the position corresponding to the first bracket. The telescopic rod is a threaded telescopic rod with its two ends pivotally connected to the first bracket and the second bracket, respectively.

3. The adjustable rear through-cut edge ejection mechanism according to claim 1, characterized in that, A roller is pivotally connected to the distal end of the second arm, and the cam bar has a profile surface that provides a preset guide path. The wheel surface of the roller contacts the profile surface of the cam bar.

4. The adjustable rear through-cut edge ejection mechanism according to claim 1, characterized in that, A reset device is provided between the front side of the first arm and the body of the cold heading machine. The reset device acts on the first arm to provide a continuous reset force opposite to the ejection direction, so that the cutting rocker arm returns to the initial position after completing the ejection action.

5. The adjustable rear through-cut edge ejection mechanism according to claim 4, characterized in that, The reset device includes a spring core rod, a spring seat, and a pin. One end of the spring core rod is fixed to the cold heading machine body through the spring seat. A recess is provided on the front side of the first arm that is opposite to the spring seat. The other end of the spring core rod extends into the recess and is fixed to the front side of the first arm through the pin.

6. The adjustable rear through-cut edge ejection mechanism according to claim 1, characterized in that, The drive arm has a groove adapted to the cam bar, and the cam bar is detachably installed in the groove by fasteners.

7. The adjustable rear through-cut edge ejection mechanism according to claim 6, characterized in that, The cam bar has an exposed portion outside the groove, and a through hole is formed on the exposed portion. The fastener is a pressure plate that passes through the through hole, and the two ends of the pressure plate that extend out of the through hole are respectively fixed to the drive swing arm by screws.

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