Self-locking safety turnover mechanism for heavy workpieces

Abstract

The application relates to a self-locking safety overturning mechanism for heavy workpieces, which is applied to a cold header. The top of the body of the cold header is provided with a bearing surface, the bearing surface is provided with an overturning arm assembly and a mounting seat, one end of an overturning shaft of the overturning arm assembly penetrates through the mounting seat to form an exposed part, a worm wheel is coaxially fixedly installed on the exposed part, and a mounting frame is fixedly arranged on the mounting seat. A worm is pivotally connected to the mounting frame and engaged with the worm wheel, and a motor is detachably installed on the mounting frame. The output shaft of the motor is in transmission connection with the worm through a shaft coupling. The self-locking safety overturning mechanism for heavy workpieces is designed, the worm and the worm gear are adopted, the self-locking characteristic of one-way transmission is utilized, the major safety hazard that overturning components fall due to accidental failure of a transmission chain is fundamentally eliminated, and the safety of equipment and personnel is ensured.

Description

Technical Field

[0001] This application relates to the field of cold heading machine technology, and in particular to a self-locking safety tilting mechanism for heavy-duty workpieces. Background Technology

[0002] In heavy industrial equipment such as cold heading machines, it is often necessary to rotate certain heavier components, such as robotic arms, protective covers, or operating tables used for conveying or positioning workpieces, from one position to another to facilitate equipment debugging, mold changing, or routine maintenance. To drive these heavy-duty components, existing technical solutions typically use motors in conjunction with reducers.

[0003] Currently, the common driving method involves a motor driving a reducer, with a sprocket mounted on the reducer's output end. This sprocket is connected to another sprocket mounted on the rotating shaft of the component to be rotated via a chain, thus transmitting power and causing the component to rotate. However, in practice, chain-sprocket transmission schemes place extremely high demands on the strength of the transmission chain. Under long-term high-load operation, the chain is prone to fatigue, wear, or even sudden breakage. Once the chain breaks, the entire transmission chain fails. Because this transmission method lacks a self-locking function, the heavily loaded component in a high position will fall rapidly under its own weight, easily causing equipment damage. More seriously, it may pose a significant threat to the lives of on-site operators.

[0004] Furthermore, during the flipping process, if the motor fails to stop in time when the component reaches the end of its stroke or gets stuck due to an accident, it will continue to drive forcibly, causing the entire transmission system to bear huge impact loads. This impact force may not only directly damage the chain or sprocket, but may also cause the motor to stall, leading to overheating or even burnout, thereby shortening the overall service life of the equipment and increasing maintenance costs. Utility Model Content

[0005] To address the aforementioned issues, this application provides a self-locking safety tilting mechanism for heavy-duty workpieces that avoids the safety hazard of falling objects.

[0006] To achieve the above objectives, this application designs a self-locking safety tilting mechanism for heavy-duty workpieces, applied to a cold heading machine. The top of the cold heading machine body has a bearing surface, on which a tilting arm assembly and a mounting base are provided. One end of the tilting shaft of the tilting arm assembly passes through the mounting base to form an exposed portion. A worm gear is coaxially fixedly mounted on the exposed portion. A mounting bracket is fixedly mounted on the mounting base. A worm gear meshing with the worm gear and a motor detachably mounted on the mounting bracket are pivotally connected to the mounting bracket. The output shaft of the motor is connected to the worm gear via a coupling. The mounting base is integrally formed with the body of the cold heading machine and protrudes from the bearing surface.

[0007] Preferably, the mounting bracket includes two opposing and vertically extending first plates, and an L-shaped side plate connecting the two first plates. A second plate and a third plate perpendicular to the second plate and extending horizontally are disposed on the L-shaped side plate. A fourth plate extending horizontally is disposed on the first plate. The second plate connects the first plate, the L-shaped side plate, the third plate, and the fourth plate. The worm gear is located between the two first plates, and both ends of the worm gear are pivotally mounted on the corresponding first plates via bearings. The motor is detachably mounted on the fourth plate. The third plate is fixed to the top of the mounting base by fasteners, and the surfaces of the L-shaped side plate and the second plate, as well as the side edge of the fourth plate, abut against the side wall of the mounting base.

[0008] Preferably, the top side of the worm gear extends at least partially between the two first plates, and the bottom of each of the two first plates is provided with an arc-shaped clearance notch that matches the wheel surface of the worm gear.

[0009] Preferably, an arc-shaped transition plate is integrally formed between the first plate and the fourth plate, and the surface of the arc-shaped transition plate smoothly transitions with the wall surface of the corresponding arc-shaped clearance notch on the first plate.

[0010] Preferably, the first plate, the L-shaped side plate, the second plate, the third plate, the fourth plate, and the arc-shaped transition plate are integral castings.

[0011] Preferably, in the horizontal direction, the rotation axis of the worm coincides with the orthographic projection of the third plate onto the L-shaped side plate.

[0012] Preferably, the tilting arm assembly includes an arm body and two oppositely arranged bearing seats. Two oppositely arranged first connecting members and second connecting members are provided at both ends of the arm body. One end of the first connecting member is fixedly connected to the arm body, and the other end is rotatably mounted on one of the bearing seats through the tilting shaft. One end of the second connecting member is fixedly connected to the arm body, and the other end is rotatably connected to the other bearing seat through a pin. The first connecting member and the tilting shaft are fixed together by a flat key.

[0013] Preferably, the first connector and the second connector are each provided with a first arm and a second arm perpendicular to the first arm at one end connected to the arm body. The first arm and the second arm are respectively fixed to two adjacent side walls of the arm body by fasteners.

[0014] Preferably, the coupling is a coupling with a friction slippage function.

[0015] The self-locking safety tilting mechanism for heavy-duty workpieces designed in this application utilizes a worm gear transmission method and its unidirectional transmission self-locking characteristic to fundamentally eliminate the major safety hazard of tilting parts falling due to accidental failure of the transmission chain, ensuring the safety of equipment and personnel. At the same time, a coupling with friction slippage function is set between the motor and the worm gear, realizing effective overload protection. When the load is too large or the movement of the mechanism is obstructed, the coupling cuts off the power by slippage, avoiding impact damage to the motor and mechanical structure, and effectively improving the operational reliability and service life of the entire mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the self-locking safety flipping mechanism for heavy-duty workpieces provided in the embodiments of this application.

[0017] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 This is a schematic diagram of the worm gear assembly provided in the embodiments of this application.

[0019] Figure 4 This is a schematic diagram of the mounting bracket provided in an embodiment of this application.

[0020] The components include: body 10, bearing surface 11, mounting base 12, tilting arm assembly 20, arm body 21, shaft seat 22, first connecting piece 23, second connecting piece 24, first arm 25, second arm 26, tilting shaft 30, exposed part 31, worm gear 40, mounting bracket 50, first plate 51, arc-shaped clearance notch 511, L-shaped side plate 52, second plate 53, third plate 54, fourth plate 55, arc-shaped transition plate 56, worm gear 60, motor 70, and coupling 80. Detailed Implementation

[0021] 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.

[0022] like Figure 1 As shown, this embodiment describes a self-locking safety tilting mechanism for heavy-duty workpieces. In this embodiment, the mechanism is applied to a cold heading machine, but this is only an example; the mechanism is also applicable to other industrial equipment that requires the safe tilting of heavy-duty components.

[0023] like Figure 1As shown, the foundation of this mechanism is the body 10 of a cold heading machine. A bearing surface 11 is provided on the top of the body 10, and a mounting base 12 is provided on this bearing surface. In this embodiment, to obtain higher structural strength and stability, the mounting base 12 is preferably integrally formed with the body 10 and protrudes upward from the bearing surface 11. Of course, in other embodiments, the mounting base 12 can also be manufactured separately and fixed to the body 10 by bolts or other means.

[0024] like Figure 1 , Figure 2 As shown, a tilting arm assembly 20 is rotatably mounted on a mounting base 12 via its tilting shaft 30. Specifically, one end of the tilting shaft 30 passes through the mounting base 12 to form an exposed portion 31, which is used to connect to a subsequent drive system. In this embodiment, the drive system is mainly mounted on a mounting bracket 50, which is firmly fixed to the mounting base 12. A worm gear 40 is coaxially fixed on the exposed portion 31 of the tilting shaft 30, and a worm 60 meshes with the worm gear 40. The worm 60 is pivotally mounted on the mounting bracket 50. The power source is a motor 70, which is detachably mounted on the mounting bracket 50. The output shaft of the motor 70 is connected to the worm 60 via a coupling 80.

[0025] Thus, the entire power transmission path is established: the motor 70 outputs power, which is transmitted to the worm 60 via the coupling 80. The worm 60 drives the worm wheel 40 to rotate. Since the worm wheel 40 is fixedly connected to the tilting shaft 30, it ultimately drives the entire tilting arm assembly 20 to tilt.

[0026] Utilizing this structural design, the drive system employs a meshing transmission between a worm gear 40 and a worm 60, effectively leveraging the unidirectional self-locking characteristic of worm gear transmission. This means that only the worm 60 can drive the worm gear 40, and the worm gear 40 cannot drive the worm 60 in the reverse direction. Therefore, regardless of whether the motor 70 is operating, or even in the event of an extreme failure in the transmission system, the tilting arm assembly 20 can be reliably locked in any position, thus completely preventing accidental falls due to gravity and ensuring extremely high safety.

[0027] Furthermore, in this embodiment, the coupling 80 preferably employs a coupling with a friction slippage function; a torque transmission threshold can be set through internal friction plates and a pressure adjustment device. During normal operation, the coupling reliably transmits power; however, when the tilting arm assembly 20 moves to the limit position or is accidentally jammed, the load torque will increase sharply. Once it exceeds the preset threshold, the coupling 80 will begin to slip, thereby cutting off the rigid connection between the motor 70 and the worm gear 60, thus providing overload protection and effectively preventing the motor 70 from burning out due to stalling, while also protecting the mechanical structure from impact damage.

[0028] In some embodiments, such as Figure 3 , Figure 4 As shown, the mounting bracket 50 includes two opposing and vertically extending first plates 51, and an L-shaped side plate 52 connecting the two first plates 51. A second plate 53 and a third plate 54 perpendicular to the second plate 53 and extending horizontally are provided on the L-shaped side plate 52. A fourth plate 55 extending horizontally is provided on the first plate 51. The second plate 53 is connected to the first plate 51, the L-shaped side plate 52, the third plate 54 and the fourth plate 55. The worm gear 60 is located between the two first plates 51, and the two ends of the worm gear 60 are pivotally mounted on the corresponding first plate 51 through bearings. The motor 70 is detachably mounted on the fourth plate 55. In practice, the first plate 51, L-shaped side plate 52, second plate 53, third plate 54, and fourth plate 55 are integrally cast parts. Compared to simple flat plates or angle steel brackets, this type of three-dimensional structure has excellent bending and torsional resistance, providing a stable and deformation-free mounting base for the motor 70 and the worm gear 60, which bears huge meshing forces, thus ensuring transmission accuracy. Furthermore, the third plate 54 is fixed to the top of the mounting base 12 with fasteners, and the surfaces of the L-shaped side plate 52 and the second plate 53, as well as the side edge of the fourth plate 55, abut against the side wall of the mounting base 12. This multi-faceted fit to the mounting base 12 utilizes surface contact instead of point or line contact, ensuring that the mounting bracket itself will not experience any displacement or vibration during operation, and making installation and calibration simpler.

[0029] In some embodiments, such as Figure 3 As shown, the top side of the worm gear 40 extends at least partially between the two first plates 51, and the bottom of each of the two first plates 51 is provided with an arc-shaped clearance notch 511 that matches the wheel surface of the worm gear 40. This allows the axis of the worm 60 to be as close as possible to the worm gear 40, greatly reducing the vertical height of the entire drive system. Correspondingly, the arc-shaped clearance notch 511 provides the necessary movement space for the normal rotation of the worm gear 40, ensuring that the worm 60 and the worm gear 40 can mesh correctly and without interference.

[0030] In some embodiments, such as Figure 3 As shown, an arc-shaped transition plate 56 is integrally formed between the first plate 51 and the fourth plate 55. The surface of the arc-shaped transition plate 56 smoothly transitions with the wall surface of the corresponding arc-shaped clearance notch 511 on the first plate 51. The use of an arc-shaped smooth transition makes the force transmission path in the structure more gradual, disperses stress, and thus effectively improves the structural strength and fatigue resistance of the mounting bracket 50, extending its service life.

[0031] In some embodiments, the first plate 51, the L-shaped side plate 52, the second plate 53, the third plate 54, the fourth plate 55, and the arc-shaped transition plate 56 are integral castings with good structural strength.

[0032] In some embodiments, in the horizontal direction, the rotation axis of the worm gear 60 coincides with the orthographic projection of the third plate 54 onto the L-shaped side plate 52. This structural design allows the center of gravity of the main weight components, including the motor 70 and the worm gear 60, to be as close as possible to the support base formed by the third plate 54 and the mounting base 12. Therefore, the overturning moment generated by the weight of the mounting bracket 50 itself is reduced. This not only prevents the mounting bracket 50 from tilting downwards but also reduces the tensile stress on the fasteners, thereby ensuring that the entire drive unit can be securely fixed to the mounting base 12 for a long period, maintaining stability even under the impact load of equipment start-up and shutdown.

[0033] In some embodiments, such as Figure 1 , Figure 2 As shown, the tilting arm assembly 20 includes an arm body 21 and two opposing bearing seats 22. Two opposing first connecting members 23 and second connecting members 24 are provided at both ends of the arm body 21. One end of the first connecting member 23 is fixedly connected to the arm body 21, and the other end is rotatably mounted on one of the bearing seats 22 via the tilting shaft 30. One end of the second connecting member 24 is fixedly connected to the arm body 21, and the other end is rotatably connected to the other bearing seat 22 via a pin. The first connecting member 23 and the tilting shaft 30 are fixed together by a flat key. This modular design greatly simplifies the process and reduces costs.

[0034] In some embodiments, such as Figure 2 As shown, both the first connector 23 and the second connector 24 are provided with a first arm 25 and a second arm 26 perpendicular to the first arm 25 at one end connected to the arm body 21. The first arm 25 and the second arm 26 are respectively fixed to two adjacent side walls of the arm body 21 by fasteners. In this way, the fixing of the first arm 25 and the second arm 26 forms a stable triangular support, which effectively enhances the torsional rigidity of the connection and ensures the stability of the arm body 21 during the flipping process, without swaying or tilting.

[0035] The self-locking safety tilting mechanism for heavy-duty workpieces provided in this application embodiment, by adopting a worm gear transmission method and utilizing its unidirectional transmission self-locking characteristics, fundamentally eliminates the major safety hazard of tilting components falling due to accidental failure of the transmission chain, ensuring the safety of equipment and personnel. At the same time, a coupling with friction slippage function is set between the motor and the worm gear, realizing effective overload protection. When the load is too large or the movement of the mechanism is obstructed, the coupling cuts off the power by slippage, avoiding impact damage to the motor and mechanical structure, and effectively improving the operational reliability and service life of the entire mechanism.

[0036] 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.

[0037] 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.

[0038] 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 self-locking safety tilting mechanism for heavy-duty workpieces, applied to a cold heading machine, characterized in that, The cold heading machine has a bearing surface on its top. A tilting arm assembly and a mounting base are provided on the bearing surface. One end of the tilting shaft of the tilting arm assembly passes through the mounting base to form an exposed portion. A worm gear is coaxially fixedly mounted on the exposed portion. A mounting bracket is fixedly mounted on the mounting base. A worm gear meshing with the worm gear and a motor detachably mounted on the mounting bracket are pivotally connected to the mounting bracket. The output shaft of the motor is connected to the worm gear via a coupling. The mounting base is integrally formed with the body of the cold heading machine and protrudes from the bearing surface.

2. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 1, characterized in that, The mounting bracket includes two opposing and vertically extending first plates, and an L-shaped side plate connecting the two first plates. A second plate and a third plate perpendicular to the second plate and extending horizontally are provided on the L-shaped side plate. A fourth plate extending horizontally is provided on the first plate. The second plate is connected to the first plate, the L-shaped side plate, the third plate, and the fourth plate. The worm gear is located between the two first plates, and its two ends are pivotally mounted on the corresponding first plates via bearings. The motor is detachably mounted on the fourth plate. The third plate is fixed to the top of the mounting base by fasteners, and the surfaces of the L-shaped side plate and the second plate, as well as the side edge of the fourth plate, abut against the side wall of the mounting base.

3. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 2, characterized in that, The top side of the worm gear extends at least partially between the two first plates, and the bottom of each of the two first plates is provided with an arc-shaped clearance notch that matches the wheel surface of the worm gear.

4. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 3, characterized in that, An arc-shaped transition plate is integrally formed between the first plate and the fourth plate, and the surface of the arc-shaped transition plate smoothly transitions with the wall surface of the corresponding arc-shaped clearance notch on the first plate.

5. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 4, characterized in that, The first plate, L-shaped side plate, second plate, third plate, fourth plate and arc-shaped transition plate are integral castings.

6. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 2, characterized in that, In the horizontal direction, the rotation axis of the worm coincides with the orthographic projection of the third plate onto the L-shaped side plate.

7. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 1, characterized in that, The tilting arm assembly includes an arm body and two oppositely arranged bearing seats. Two oppositely arranged first connecting members and second connecting members are provided at both ends of the arm body. One end of the first connecting member is fixedly connected to the arm body, and the other end is rotatably mounted on one of the bearing seats through the tilting shaft. One end of the second connecting member is fixedly connected to the arm body, and the other end is rotatably connected to the other bearing seat through a pin. The first connecting member and the tilting shaft are fixed together by a flat key.

8. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 7, characterized in that, Both the first connector and the second connector are provided with a first arm and a second arm perpendicular to the first arm at one end connected to the arm body. The first arm and the second arm are respectively fixed to two adjacent side walls of the arm body by fasteners.

9. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 1, characterized in that, The coupling is a coupling with friction slippage function.

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