Camless rear pop-up mechanism

Abstract

The application relates to a cam-free rear through ejection mechanism. A driving shaft cooperates with a connecting rod and a main swing arm to form a four-bar mechanism to provide basic driving, so that a compact connecting rod system is formed, the traditional large disc cam and transmission chain are abandoned, the overall structure of the mechanism is effectively simplified, the manufacturing cost and assembly difficulty are reduced, the power transmission path is shortened, and movement errors caused by gap accumulation are reduced. Meanwhile, compared with the hard impact of the main slider direct driving type, the transmission mode of the four-bar mechanism is smoother, vibration and wear are reduced, and the stability under high-speed working conditions is improved. In addition, the front reset device cooperates with the driving mechanism to ensure that the main swing arm can quickly and reliably return to the initial position after completing the ejection action, thereby providing guarantee for high-frequency continuous production.

Description

Technical Field

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

[0002] In the cold heading process, after the metal wire is forged, it will be tightly bound in the cavity of the main mold due to plastic deformation. In order to achieve automated continuous production, the formed workpiece must be reliably ejected from the main mold after each step is completed so that the conveying mechanism can clamp it and send it to the next station. The device that completes this key action is the back ejection mechanism.

[0003] A typical rear-entry ejector mechanism usually includes an ejector camshaft driven by the main drive system and rotating synchronously with the main machine motion. A disc cam with a specific profile is mounted on this camshaft. When the cam rotates, the rotational motion is converted into the linear reciprocating motion of the ejector rod through a transmission system consisting of one or more levers, thereby ejecting the workpiece. However, this cam-driven mechanism requires the machining of large, high-precision disc cams, as well as matching camshafts, bearing housings, and transmission gears. The entire transmission chain is relatively long, resulting in high manufacturing costs and assembly difficulties. Utility Model Content

[0004] To address the aforementioned issues, this application provides a camless rear-through ejection mechanism that simplifies the structure and reduces costs.

[0005] To achieve the above objectives, this application designs a camless rear-through ejector mechanism for a cold heading machine, comprising: A drive shaft is mounted on the body of the cold heading machine, and the drive shaft can reciprocate around a first fixed axis. A drive swing arm, which is fixed to the drive shaft to swing synchronously with it; The main swing arm is mounted on the body of the cold heading machine. The main swing arm can swing around a second fixed axis parallel to the axis of the drive shaft. The upper part of the main swing arm is used to drive a push rod assembly, and the lower part is used to receive the driving force. A connecting rod, one end of which is pivotally connected to the drive swing arm and the other end of which is pivotally connected to the lower part of the main swing arm, is used to transmit the swing of the drive swing arm to the main swing arm to drive it to perform the ejection action.

[0006] Preferably, the drive swing arm includes a first arm and a second arm set at an angle to the first arm. The first arm and the second arm are provided with a plurality of screw holes spaced apart along the axial direction of the drive shaft, and each of the plurality of screw holes is provided with a fastener that is fixedly connected to the drive shaft.

[0007] Preferably, the top of the second arm is integrally formed with a plurality of seats arranged axially spaced along the drive shaft, a synchronous shaft is provided between each of the seats, and a connecting rod is pivotally connected to the synchronous shaft between two adjacent seats.

[0008] Preferably, the main swing arm includes a main shaft fixed to the body of the cold heading machine, and an ejector rocker arm and a trimming rocker arm pivotally connected to the main shaft; a threaded telescopic rod is pivotally connected to the lower part of the trimming rocker arm; a support for fixing the other end of the threaded telescopic rod and a roller are provided at the lower part of the ejector rocker arm; wherein, a cam bar with a preset contour surface is provided on the drive swing arm, and the wheel surface of the roller at the lower part of the ejector rocker arm contacts the contour surface of the cam bar.

[0009] Preferably, it further includes a reset device, which is installed between the front side of the trimming rocker arm and the cold heading machine body, for providing a continuous reset force opposite to the ejection direction, so that the trimming rocker arm returns to the initial position after completing the ejection action.

[0010] Preferably, the reset device is a cylinder, a hydraulic cylinder, a nitrogen spring, or a mechanical spring assembly.

[0011] 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 trimming rocker 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 trimming rocker arm through the pin.

[0012] The camless rear-through ejection mechanism designed in this application utilizes a four-bar linkage consisting of a drive shaft, connecting rods, and main swing arm to provide basic drive, forming a compact linkage system. This eliminates the need for traditional large disc cams and transmission chains, effectively simplifying the overall structure, reducing manufacturing costs and assembly difficulty, and shortening the power transmission path, thus reducing motion errors caused by accumulated backlash. Furthermore, compared to the direct-drive, hard impact of the main slide block, this four-bar linkage operates more smoothly, reducing vibration and wear, and improving stability under high-speed conditions. In addition, the front-mounted reset device works in conjunction with the drive mechanism to ensure that the main swing arm can quickly and reliably return to its initial position after completing the ejection action, providing a guarantee for high-frequency continuous production. Attached Figure Description

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

[0014] Figure 2 This is a three-dimensional structural schematic diagram of the camless rear-through ejection mechanism provided in the embodiments of this application from another perspective.

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

[0016] Figure 4 This is an assembly diagram of the camless rear-through ejection mechanism provided in the embodiments of this application.

[0017] The components include: body 100, push rod assembly 200, drive shaft 10, drive swing arm 20, first arm 21, second arm 22, screw hole 23, base 24, synchronous shaft 25, main swing arm 30, main shaft 31, push-out rocker arm 32, trimming rocker arm 33, threaded telescopic rod 34, support 35, roller 36, cam strip 37, connecting rod 40, reset device 50, spring core rod 51, spring seat 52, pin 53, and recess 54. 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 Figure 4 As shown, the camless rear-through ejection mechanism described in this embodiment is used to be installed on a cold heading machine to achieve workpiece ejection. Figures 1 to 4 As shown, the mechanism mainly includes a drive shaft 10, a drive swing arm 20, a main swing arm 30, and a connecting rod 40.

[0020] Specifically, the drive shaft 10 is horizontally mounted on the body 100 of the cold heading machine and can reciprocate around its own central axis, i.e., the first fixed axis. The drive shaft 10 is usually driven by the main drive system of the cold heading machine (not shown in the figure) through an eccentric wheel or other linkage mechanism. Its oscillation is synchronized with the reciprocating motion of the main slide of the cold heading machine, serving as the power source for the entire ejection mechanism.

[0021] The drive swing arm 20 is sleeved and fixed on the drive shaft 10 to ensure that it can swing synchronously with the reciprocating swing of the drive shaft 10. In this embodiment, the drive swing arm 20 can be firmly circumferentially fixed to the drive shaft 10 by means of clamping or key connection.

[0022] The main swing arm 30 is also mounted on the body 100 of the cold heading machine. It can swing about a second fixed axis via a main shaft, which is parallel to the first fixed axis of the drive shaft 10. The overall structure of the main swing arm 30 extends the entire width of the cold heading machine body 100. Its upper part faces and drives a push rod assembly 200, while its lower part receives the driving force from the connecting rod 40. This lever-type structure design can effectively transmit and amplify the input motion and force.

[0023] like Figure 3 As shown, one end of the connecting rod 40 is pivotally connected to the drive swing arm 20, and the other end is pivotally connected to the lower part of the main swing arm 30, for transmitting the swing of the drive swing arm 20 to the main swing arm 30 to drive it to perform the ejection action. With this arrangement, the drive swing arm 20, the connecting rod 40, the main swing arm 30, and the body 100 between them together constitute a four-bar linkage.

[0024] The working process of this embodiment is as follows: When the cold heading machine begins an ejection cycle, the drive shaft 10, driven by its drive source, begins to swing in one direction. The drive swing arm 20 swings synchronously, pulling the lower part of the main swing arm 30 through the connecting rod 40. The main swing arm 30 then swings around its own second fixed axis, while its upper part moves forward, pushing the ejector assembly 200 to eject the workpiece from the mold. After the ejection action is completed, the drive shaft 10 begins to swing in the opposite direction, driving the connecting rod 40, drive swing arm 20, and other components back to the initial position at the beginning of the cycle, preparing for the next working cycle.

[0025] In this way, the transmission design of the four-bar linkage replaces the traditional large disc cam and complex transmission chain, greatly simplifying the structure of the entire ejection mechanism and reducing manufacturing costs and maintenance difficulty. At the same time, the linkage transmission method ensures smooth operation, avoids impact and severe wear, improves the reliability and lifespan of the mechanism under high-speed conditions, and ensures the continuity of automated production.

[0026] In some embodiments, such as Figure 2 As shown, the drive swing arm 20 can be designed as an integral L-shaped or other angled structure, comprising a first arm 21 and a second arm 22 set at a specific angle to the first arm 21. The first arm 21 is mainly used for mounting and fixing to the drive shaft 10, while the second arm 22 is mainly used for connecting the connecting rod 40. To achieve a firm and reliable fixation between the drive swing arm 20 and the drive shaft 10, multiple screw holes 23 are spaced apart along the axial direction of the drive shaft 10 on the first arm 21 and the second arm 22. By inserting and tightening multiple fasteners, such as bolts, into these screw holes 23, a clamping force can be generated on the open arm body, thereby tightly clamping and locking the drive swing arm 20 to the drive shaft 10 to prevent relative slippage when transmitting huge torque. This structure is not only reliable in fixing, but also facilitates assembly and phase adjustment.

[0027] In some embodiments, such as Figure 2As shown, the top of the second arm 22 is integrally formed with multiple seats 24 spaced apart along the axial direction of the drive shaft 10. These seats 24 provide a stable and parallel support reference. A synchronous shaft 25 is installed and passes through these seats 24, with both ends supported on the seats 24 by bearings or other means. This embodiment includes multiple connecting rods 40, one end of which is pivotally connected to the synchronous shaft 25 via an independent bearing or bushing. Using this structural design, the single swing generated by the drive arm 20 can be evenly and synchronously distributed to the multiple connecting rods 40 via the synchronous shaft 25, thereby driving the subsequent main arm 30 and ensuring the consistency of the movement.

[0028] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, the main swing arm 30 includes a main shaft 31 fixed to the cold heading machine body 100, and an ejector rocker arm 32 and a trimming rocker arm 33 pivotally connected to the main shaft 31. A threaded telescopic rod 34 is pivotally connected to the lower part of the trimming rocker arm 33. A support 35 for fixing the other end of the threaded telescopic rod 34 and a roller 36 are provided at the lower part of the ejector rocker arm 32. A cam strip 37 with a preset contour surface is provided on the drive swing arm 20, and the wheel surface of the roller 36 at the lower part of the ejector rocker arm 32 contacts the contour surface of the cam strip 37. Thus, by adjusting the effective length of the threaded telescopic rod 34, the starting and ending times of the trimming action of the trimming rocker arm 33 relative to the ejection action can be precisely adjusted without disassembling the cam strip 37, effectively improving ease of use.

[0029] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, a reset device 50 is also included. The reset device 50 is installed between the front side of the trimming rocker arm 33 and the cold heading machine body 100. It is used to provide a continuous reset force opposite to the ejection direction so that the trimming rocker arm 33 returns to its initial position after completing the ejection action. In specific implementations, the reset device 50 can be a cylinder, a hydraulic cylinder, a nitrogen spring, or a mechanical spring assembly.

[0030] In one specific embodiment, such as Figure 2 , Figure 3As shown, the reset device 50 includes a spring core 51, a spring seat 52, and a pin 53. One end of the spring core 51 is fixed to the cold heading machine body 100 via the spring seat 52. A recess 54 is recessed on the front side of the trimming rocker arm 33, which is opposite to the spring seat 52. The other end of the spring core 51 extends into the recess 54 and is fixed to the front side of the trimming rocker arm 33 via the pin 53. With this structure, the compression spring inside the spring core 51 can continuously apply a backward, stable reset thrust to the trimming rocker arm 33. This connection method is simple in structure, accurate in positioning, and convenient to assemble and disassemble.

[0031] The camless rear-through ejection mechanism provided in this application embodiment uses a four-bar linkage consisting of a drive shaft, connecting rods, and main swing arm to provide basic drive, forming a compact linkage system. This eliminates the need for traditional large disc cams and transmission chains, effectively simplifying the overall structure, reducing manufacturing costs and assembly difficulty, and shortening the power transmission path, thus reducing motion errors caused by accumulated backlash. Furthermore, compared to the direct-drive, hard impact of the main slide block, this four-bar linkage operates more smoothly, reducing vibration and wear, and improving stability under high-speed conditions. In addition, the front-mounted reset device works in conjunction with the drive mechanism to ensure that the main swing arm can quickly and reliably return to its initial position after completing the ejection action, providing a guarantee for high-frequency continuous production.

[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. A camless post-ejection mechanism for a cold header, characterized by, include: A drive shaft is mounted on the body of the cold heading machine, and the drive shaft can reciprocate around a first fixed axis. A drive swing arm, which is fixed to the drive shaft to swing synchronously with it; The main swing arm is mounted on the body of the cold heading machine. The main swing arm can swing around a second fixed axis parallel to the axis of the drive shaft. The upper part of the main swing arm is used to drive a push rod assembly, and the lower part is used to receive the driving force. A connecting rod, one end of which is pivotally connected to the drive swing arm and the other end of which is pivotally connected to the lower part of the main swing arm, is used to transmit the swing of the drive swing arm to the main swing arm to drive it to perform the ejection action.

2. The camless post-ejection mechanism according to claim 1, wherein The drive arm includes a first arm and a second arm that is angled to the first arm. Multiple screw holes are spaced apart along the axial direction of the drive shaft on the first and second arms, and each screw hole contains a fastener that is fixedly connected to the drive shaft.

3. The camless rear-through ejection mechanism according to claim 2, characterized in that, The top of the second arm is integrally formed with multiple seats arranged axially spaced along the drive shaft, and a synchronous shaft passes through each of the seats. A connecting rod is pivotally connected to the synchronous shaft between two adjacent seats.

4. The camless rear-through ejection mechanism according to claim 1, characterized in that, The main swing arm includes a main shaft fixed to the cold heading machine body, and an ejector rocker arm and a trimming rocker arm pivotally connected to the main shaft; a threaded telescopic rod is pivotally connected to the lower part of the trimming rocker arm; a support for fixing the other end of the threaded telescopic rod and a roller are provided at the lower part of the ejector rocker arm; wherein, a cam bar with a preset contour surface is provided on the drive swing arm, and the wheel surface of the roller at the lower part of the ejector rocker arm contacts the contour surface of the cam bar.

5. The camless rear-through ejection mechanism according to claim 4, characterized in that, It also includes a reset device, which is installed between the front side of the trimming rocker arm and the cold heading machine body, to provide a continuous reset force opposite to the ejection direction, so that the trimming rocker arm returns to the initial position after completing the ejection action.

6. The camless rear-through ejection mechanism according to claim 5, characterized in that, The reset device is a cylinder, a hydraulic cylinder, a nitrogen spring, or a mechanical spring assembly.

7. The camless rear-through ejection mechanism according to claim 5, 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. The front side of the trimming rocker arm has a recess 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 trimming rocker arm through the pin.

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