Self-locking safety turnover mechanism for heavy workpieces

Abstract

The application relates to a self-locking safety turnover 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 body comprises a fixed plate arranged at the edge of the bearing surface in the width direction, the fixed plate being provided with a lateral support surface at one end in the length direction of the bearing surface; a bearing groove surface is concavely arranged on the bearing surface; a turnover arm assembly is pivotally arranged on the bearing groove surface, the turnover arm assembly being capable of being turned around a horizontally arranged rotary shaft, and the rotary shaft axis extends along the width direction of the bearing surface. The self-locking safety turnover mechanism for heavy workpieces is designed to be driven by a worm and gear speed reduction mechanism, and the safety hidden danger that the turnover arm falls due to power interruption is fundamentally eliminated by using the self-locking characteristics of one-way transmission. In addition, the slip unloading function when the movement is blocked is realized by integrating an overload protection coupling, and the driving motor is effectively prevented from being damaged due to locking.

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. The machine body includes: a fixed plate, which is located at the edge of the bearing surface in the width direction, and a lateral support surface at one end of the fixed plate in the length direction of the bearing surface; a bearing groove surface, recessed on the bearing surface; a tilting arm assembly, pivotally mounted on the bearing groove surface, which can tilt around a horizontally arranged rotation shaft, the axis of which extends along the width direction of the bearing surface; a drive unit for driving the rotation shaft to rotate around its axis; a gearbox having a horizontal bottom mounting plate and a vertical lateral abutment plate, the bottom mounting plate being fixedly connected to the bearing surface by fasteners, and the lateral abutment plate being fixedly connected to the lateral support surface by fasteners; and a worm gear reduction mechanism located inside the gearbox. The drive unit is connected to the rotary shaft via the worm gear reduction mechanism.

[0007] Preferably, the gearbox includes a base plate constituting the bottom mounting plate, and a first plate, a second plate, a third plate, and a fourth plate vertically disposed on the base plate. The first plate, the second plate, the third plate, and the fourth plate enclose an internal space for accommodating the worm gear reduction mechanism. Specifically: a motor mount is disposed on the first plate; two first mounting holes are disposed on the base plate; the edge of the motor mount protrudes from the first plate in the width direction of the bearing surface; threaded holes are disposed at each of the four corners of the motor mount; and a first stepped positioning hole is provided on the motor mount. A first worm gear support frustum coaxial with the rotating shaft protrudes from the second plate; a second stepped positioning hole is coaxially disposed on the first worm gear support frustum; a lateral abutment plate protrudes from the second plate; and two second mounting holes are disposed on the lateral abutment plate. The third plate partially contacts the lateral support surface, and the surface of the third plate in contact with the lateral support surface is flush with the surface of the lateral abutment plate. The third plate is provided with a third step positioning hole coaxial with the first step positioning hole; the third plate is provided with six first end cap through holes located circumferentially to the third step positioning hole; the fourth plate is provided with a second worm gear support frustum protruding from it, and a worm gear support through hole is coaxially provided on the second worm gear support frustum; the fourth plate is provided with six second end cap through holes located circumferentially to the second worm gear support frustum.

[0008] Preferably, the first plate, the second plate, the third plate, the fourth plate, and the side abutment plate are integral castings.

[0009] Preferably, the drive unit is a geared motor detachably mounted on the motor base, and the output shaft of the geared motor is perpendicular to the rotary shaft; the worm gear reduction mechanism includes a worm and a worm wheel meshing with the worm, the output shaft of the geared motor is drivenly connected to the worm, the worm wheel is fixedly connected to a worm wheel shaft, and the worm wheel shaft passes through a second step positioning hole and is drivenly connected to the rotary shaft through an overload protection coupling.

[0010] Preferably, the fourth plate is at a lower vertical height than the first, second, and third plates, to form a notch that exposes the worm gear.

[0011] Preferably, the worm gear shaft is pivotally connected to the second step positioning hole and the worm gear support through hole via a pair of tapered roller bearings, and the two ends of the worm are pivotally connected to the first step positioning hole and the third step positioning hole via a deep groove ball bearing, respectively. Furthermore, a thrust ball bearing is provided at the end of the worm away from the geared motor.

[0012] Preferably, the tilting arm assembly includes an arm body assembly, a first bearing seat and a second bearing seat, and a first arm seat and a second arm seat respectively fixed at both ends of the arm body assembly. The first bearing seat is fixedly connected to the bearing groove surface, and the first bearing seat has an active through hole for pivotally connecting the rotary shaft. The second bearing seat is fixedly connected to the bearing groove surface and spaced apart from the first bearing seat, and the second bearing seat has a driven through hole for pivotally connecting the tilting arm assembly. The first arm seat has a clamping connection structure for sleeved on the rotary shaft, and a keyway is opened on the peripheral wall of the rotary shaft. The clamping connection structure includes an open slot that extends radially along the rotary shaft and an arm seat protrusion that mates with the keyway on the rotary shaft, as well as a locking through hole and a locking member for tightening the open slot. The second arm seat is pivotally connected to the second bearing seat through a pin passing through the driven through hole.

[0013] Preferably, the body has a fixed platform protruding outward in the width direction of the bearing surface, and the fixed platform protrudes from the bearing surface in the height direction of the fixed plate to form a step, and part of the third plate abuts against the step of the fixed platform.

[0014] Preferably, the first arm seat and the second arm seat are each provided with a first extension and a second extension perpendicular to the first extension at one end connected to the arm assembly, and the first extension and the second extension are respectively fixed to two adjacent side walls of the arm assembly by fasteners.

[0015] The self-locking safety tilting mechanism for heavy-duty workpieces designed in this application utilizes a worm gear reducer for transmission. Leveraging its unidirectional transmission and self-locking characteristics, it fundamentally eliminates the safety hazard of the tilting arm falling due to power interruption. Furthermore, by integrating an overload protection coupling, it achieves a slippage unloading function when movement is obstructed, effectively preventing damage to the drive motor due to stalling and protecting the transmission system. This comprehensively improves the mechanism's operational safety, reliability, and service life. 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 This is a schematic diagram of the structure of the organism provided in the embodiments of this application.

[0018] Figure 3 This is an installation diagram of the gearbox provided in an embodiment of this application.

[0019] Figure 4 yes Figure 1 Enlarged diagram of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the gearbox provided in the embodiment of this application.

[0021] Figure 6 This is a structural schematic diagram of the gearbox provided in an embodiment of this application from another perspective.

[0022] Figure 7 This is a schematic diagram of the assembly structure of the worm gear provided in the embodiments of this application.

[0023] Figure 8 This is a schematic diagram of the tilting arm assembly provided in the embodiments of this application.

[0024] The components include: 1. Body; 2. Fixing plate; 3. Bearing groove surface; 4. Rotary shaft; 5. Gearbox; 6. Bottom mounting plate; 7. Side abutment plate; 8. Gear motor; 9. Overload protection coupling; 10. First arm seat; 11. Second arm seat; 12. Opening slot; 13. Fixing platform; 14. Arm seat protrusion; 15. Bearing surface; 16. Side support surface; 17. Worm gear; 18. Worm gear shaft; 19. Worm; 20. Base plate; 21. First plate; 22. Second plate; 23. Third plate; 24. Fourth plate; 25. Motor seat; 26. First step positioning hole; 27. First worm gear support frustum; 28. Second step positioning hole; 29. ​​Third step positioning hole; 30. Second worm gear support frustum; 31. Worm gear support through hole; 32. First extension; 33. Second extension; 40. Tilting arm assembly; 41. Arm body assembly; 42. First shaft seat; 43. Second shaft seat. Detailed Implementation

[0025] 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.

[0026] like Figures 1 to 8 As shown, the self-locking safety tilting mechanism for heavy-duty workpieces designed in this application is mainly used in heavy equipment such as cold heading machines to achieve safe and stable tilting of heavy-duty workpieces or molds. The tilting mechanism mainly includes a body 1, a tilting arm assembly 40, a drive unit, a gearbox 5, and a worm gear reduction mechanism.

[0027] The entire mechanism is installed on top of the body 1 of the cold heading machine. For example... Figure 1 As shown, the upper surface of the body 1 has a horizontal bearing surface 15, and a bearing groove 3 is recessed on the bearing surface 15 to provide a stable mounting reference. A fixing plate 2 is integrally formed or fixedly connected to the edge of the bearing surface 15 in the width direction of the body 1. One end of the fixing plate 2 extends to form a lateral support surface 16 that is approximately perpendicular to the bearing surface 15. In specific implementations, to obtain higher structural strength and stability, the fixing plate 2 is preferably integrally formed with the body 1 and protrudes upward from the bearing surface 15. Of course, in other embodiments, the fixing plate 2 can also be manufactured independently and fixed to the body 1 by bolts or other means.

[0028] The tilting arm assembly 40 is pivotally mounted on the bearing groove surface 3 and can be tilted about a horizontally arranged rotary shaft 4, the axis of which extends along the width direction of the bearing surface 15. At the same time, in order to drive the tilting arm assembly 40 to move, the machine body 1 is also provided with a drive unit for driving the rotary shaft 4 to rotate about its axis.

[0029] Specifically, the gearbox 5 is equipped with a worm gear reduction mechanism. The gearbox 5 has a horizontal bottom mounting plate 6 and a vertical side abutment plate 7. During installation, the bottom mounting plate 6 is fixedly connected to the bearing surface 15 by fasteners, and the side abutment plate 7 is fixedly connected to the side support surface 16 by fasteners. This method of fixing using two reference planes, horizontal and vertical, ensures that the gearbox 5 has extremely high installation stability and torsional resistance when subjected to huge overturning moments.

[0030] The power of the drive unit, such as the geared motor, is ultimately transmitted to the rotary shaft 4 through a worm gear reduction mechanism located inside the gearbox 5. This indirect transmission via the worm gear mechanism provides the entire tilting mechanism with reliable self-locking capability in the event of power failure, thus ensuring operational safety. Simultaneously, when the drive unit outputs driving torque, it experiences an overturning reaction torque in the opposite direction. This overturning reaction torque drives the lateral abutment plate 7 of the gearbox 5, pressing it tightly against the lateral support surface 16 of the body 1. The fasteners on the lateral abutment plate 7 primarily bear shear stress rather than tensile stress, thereby utilizing the rigidity of the body 1 to counteract the overturning reaction torque and absorb vibrations during drive unit operation, achieving a stable heavy-load drive.

[0031] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 As shown, the gearbox 5 includes a base plate 20 constituting the bottom mounting plate 6, and a first plate 21, a second plate 22, a third plate 23, and a fourth plate 24 vertically disposed on the base plate 20. The first plate 21, the second plate 22, the third plate 23, and the fourth plate 24 enclose an internal space to accommodate the worm gear reduction mechanism. In this way, all the plates can be obtained from standard steel plates using efficient and low-cost methods such as laser cutting, eliminating the need for molds. Finally, all the separate plates are welded together, effectively reducing manufacturing costs. Of course, in other embodiments, the first plate 21, the second plate 22, the third plate 23, the fourth plate 24, and the side abutment plate 7 are integrally cast, which can reduce processing costs.

[0032] The first plate 21 is provided with a motor base 25, the base plate 20 is provided with two first mounting holes, the edge of the motor base 25 protrudes from the first plate 21 in the width direction of the bearing surface 15, and threaded holes are provided at all four corners of the motor base 25. The motor base 25 is provided with a first stepped positioning hole 26; the second plate 22 has a first worm gear support frustum 27 protruding from it and coaxial with the rotary shaft 4, and a second stepped positioning hole 28 is provided coaxially on the first worm gear support frustum 27; the lateral abutment plate 7 protrudes from the second plate 22 and is provided with two second mounting holes; the first... The third plate 23 is in partial contact with the lateral support surface 16, and the surface of the third plate 23 in contact with the lateral support surface 16 is flush with the surface of the lateral abutment plate 7; the third plate 23 is provided with a third step positioning hole 29 coaxial with the first step positioning hole 26; the third plate 23 is provided with six first end cap through holes located around the third step positioning hole 29; the fourth plate 24 is provided with a second worm gear support frustum 30 protruding from it, and a worm gear support through hole 31 is coaxially provided on the second worm gear support frustum 30; the fourth plate 24 is provided with six second end cap through holes located around the second worm gear support frustum 30.

[0033] In practice, these positioning holes can be completed by boring them in one clamping after the plate is welded and formed, thus achieving a much higher positional accuracy than separate machining and reassembly. The boss structures such as the motor base 25, the first worm gear support frustum 27, and the second worm gear support frustum 30 provide clear and accurate axial and radial positioning references for the motor, bearing housing, and end cover, simplifying the assembly process, avoiding cumulative errors, and ensuring the stable operation of the transmission system.

[0034] In some embodiments, such as Figure 1 , Figure 5 , Figure 6 As shown, the drive unit is a geared motor 8 detachably mounted on the motor base 25. The output shaft of the geared motor 8 is perpendicular to the rotary shaft 4, facilitating subsequent maintenance or replacement. The worm gear reduction mechanism includes a worm 19 and a worm wheel 17 meshing with it. The output power of the geared motor 8 is directly transmitted to the worm 19, driving it to rotate. The worm 19 then drives the worm wheel 17 to rotate. The worm wheel 17 is fixedly connected to a worm wheel shaft 18. The end of the worm wheel shaft 18 passes through the second stepped positioning hole 28. Finally, the worm wheel shaft 18 is connected to the rotary shaft 4 through an overload protection coupling 9. This overload protection coupling 9 acts as a torque limiter, providing a reliable mechanical overload safety guarantee for the entire transmission system, in addition to the motor's electronic control protection.

[0035] In some embodiments, to facilitate the observation and maintenance of key components inside the gearbox, such as...Figure 5 , Figure 7 As shown, the fourth plate 24 is vertically lower than the first plate 21, the second plate 22, and the third plate 23, forming a notch that exposes the worm gear 19. This height difference creates an opening on the side wall of the gearbox that exposes the worm gear 19. Through this opening, maintenance personnel can directly observe the lubrication and meshing status of the worm gear 19 without disassembling the gearbox top cover or end cover, greatly simplifying daily inspection and maintenance.

[0036] In some embodiments, the worm gear shaft 18 is pivotally connected to the second stepped positioning hole 28 and the worm gear support through hole 31 via a pair of tapered roller bearings. The tapered roller bearings can simultaneously withstand heavy radial and axial loads, providing extremely rigid support for the worm gear shaft 18 and effectively preventing it from tilting or displacing under load. The two ends of the worm 19 are pivotally connected to the first stepped positioning hole 26 and the third stepped positioning hole 29 via deep groove ball bearings, respectively. Furthermore, the end of the worm 19 furthest from the geared motor 8 is also provided with a thrust ball bearing to precisely limit the axial movement of the worm 19, ensuring a constant meshing clearance, effectively improving transmission efficiency, and extending the service life of the worm gear pair.

[0037] In some embodiments, such as Figure 1 , Figure 8 As shown, the tilting arm assembly 40 includes an arm body assembly 41, a first bearing seat 42 and a second bearing seat 43, and a first arm seat 10 and a second arm seat 11 respectively fixed at both ends of the arm body assembly 41. The first bearing seat 42 is fixedly connected to the bearing groove surface 3, and has an active through hole for pivoting the rotary shaft 4. The second bearing seat 43 is fixedly connected to the bearing groove surface 3 and spaced apart from the first bearing seat 42, and has a driven through hole for pivoting the tilting arm assembly 40. Thus, the first bearing seat 42 side is the active end, responsible for receiving and transmitting the large torque from the rotary shaft 4; while the second bearing seat 43 side is the driven end, providing only a rotation fulcrum and mainly bearing radial support force. This master-slave separation design effectively decouples the torque load and the support load, avoiding complex stress coupling and making the stress analysis and structural optimization of the entire system simpler and more reliable.

[0038] Furthermore, the first arm seat 10 is provided with a clamping connection structure for fitting the rotary shaft 4, and a keyway is provided on the peripheral wall of the rotary shaft 4. The clamping connection structure includes an open slot 12 extending radially along the rotary shaft 4, an arm seat protrusion 14 that mates with the keyway on the rotary shaft 4, and a locking through hole and locking element for tightening the open slot 12. The second arm seat 11 is pivotally connected to the second shaft seat 43 via a pin passing through the driven through hole. Compared to interference fits that require heating or strong pressing, this clamping connection only requires fitting the arm seat onto the rotary shaft and then tightening the locking element during installation. Disassembly is performed in reverse; after loosening the locking element, the arm seat can be easily removed, greatly facilitating on-site maintenance and repair.

[0039] In some embodiments, such as Figure 1 , Figure 8 As shown, the characteristic feature is that the ends of the first arm seat 10 and the second arm seat 11 that connect to the arm assembly 41 are both designed as L-shaped connection structures, that is, including a first extension 32 and a second extension 33 arranged perpendicularly to the first extension 32. These two extensions are respectively fixed to two adjacent side walls of the arm assembly 41 by fasteners. This method of fixing using two mutually perpendicular mounting surfaces effectively enhances the bending and torsional resistance of the connection.

[0040] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 As shown, the body 1 has a fixed platform 13 protruding outward in the width direction of the bearing surface 15, and the fixed platform 13 protrudes from the bearing surface 15 in the height direction of the fixed plate 2 to form a step. During installation, a portion of the third plate 23 of the gearbox 5 abuts against the step of the fixed platform 13, providing an additional rigid support point for the gearbox 5, which can more effectively resist the huge reaction torque generated during flipping and ensure the stability of the entire system.

[0041] The self-locking safety tilting mechanism for heavy-duty workpieces provided in this application uses a worm gear reducer for transmission. Utilizing its unidirectional self-locking characteristic, it fundamentally eliminates the safety hazard of the tilting arm falling due to power interruption. Furthermore, by integrating an overload protection coupling, it achieves a slippage unloading function when movement is obstructed, effectively preventing damage to the drive motor due to stalling and protecting the transmission system. This comprehensively improves the mechanism's operational safety, reliability, and service life.

[0042] 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.

[0043] 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.

[0044] 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 (15) on its top body (1). The body (1) includes: a fixing plate (2) located at the edge of the bearing surface (15) in the width direction, and a lateral support surface (16) at one end of the bearing surface (15) in the length direction; a bearing groove surface (3) recessed in the bearing surface (15); and a tilting arm assembly (40) pivotally mounted on the bearing groove surface (3). The tilting arm assembly (40) can rotate around a horizontally positioned... The rotating shaft (4) is flipped, and the axis of the rotating shaft (4) extends along the width direction of the bearing surface (15); a drive unit is used to drive the rotating shaft (4) to rotate around its axis; a gearbox (5) has a horizontal bottom mounting plate (6) and a vertical side abutment plate (7), the bottom mounting plate (6) is fixedly connected to the bearing surface (15) by fasteners, and the side abutment plate (7) is fixedly connected to the side support surface (16) by fasteners; a worm gear reduction mechanism is provided inside the gearbox (5); The drive unit is connected to the rotary shaft (4) via the worm gear reduction mechanism.

2. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 1, characterized in that, The gearbox (5) includes a base plate (20) constituting the bottom mounting plate (6), and a first plate (21), a second plate (22), a third plate (23), and a fourth plate (24) vertically arranged on the base plate (20). The first plate (21), the second plate (22), the third plate (23), and the fourth plate (24) enclose an internal space for accommodating the worm gear reduction mechanism. Specifically, a motor mount (25) is provided on the first plate (21), and two first mounting holes are provided on the base plate (20). The edge of the motor mount (25) protrudes from the first plate (21) in the width direction of the bearing surface (15). Threaded holes are provided at all four corners of the motor base (25), and a first step positioning hole (26) is provided on the motor base (25); a first worm gear support frustum (27) coaxial with the rotary shaft (4) protrudes from the second plate (22), and a second step positioning hole (28) is provided on the first worm gear support frustum (27) coaxially; the lateral abutment plate (7) protrudes from the second plate (22), and two second mounting holes are provided on the lateral abutment plate (7); the third plate (23) partially contacts the lateral support surface (16), and the surface of the third plate (23) in contact with the lateral support surface (16) is flush with the plate surface of the lateral abutment plate (7); The third plate (23) is provided with a third step positioning hole (29) coaxial with the first step positioning hole (26); the third plate (23) is provided with six first end cap through holes located circumferentially to the third step positioning hole (29); the fourth plate (24) is provided with a second worm gear support frustum (30), the second worm gear support frustum (30) is provided with a worm gear support through hole (31) coaxially to the second worm gear support frustum (30), and the fourth plate (24) is provided with six second end cap through holes located circumferentially to the second worm gear support frustum (30).

3. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 2, characterized in that, The first plate (21), the second plate (22), the third plate (23), the fourth plate (24) and the side abutment plate (7) are an integral casting.

4. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 2, characterized in that, The drive unit is a geared motor (8) detachably mounted on the motor base (25). The output shaft of the geared motor (8) is perpendicular to the rotary shaft (4). The worm gear reduction mechanism includes a worm (19) and a worm wheel (17) meshing with the worm (19). The output shaft of the geared motor (8) is connected to the worm (19) in a transmission connection. The worm wheel (17) is fixedly connected to a worm wheel shaft (18). The worm wheel shaft (18) passes through the second step positioning hole (28) and is connected to the rotary shaft (4) in a transmission connection through an overload protection coupling (9).

5. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 4, characterized in that, The fourth plate (24) is at a lower vertical height than the first plate (21), the second plate (22) and the third plate (23) to form a notch that exposes the worm (19).

6. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 4, characterized in that, The worm shaft (18) is pivotally connected to the second step positioning hole (28) and the worm support through hole (31) by a pair of tapered roller bearings. The two ends of the worm (19) are pivotally connected to the first step positioning hole (26) and the third step positioning hole (29) by a deep groove ball bearing, respectively. The end of the worm (19) away from the geared motor (8) is also provided with a thrust ball bearing.

7. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 2, characterized in that, The tilting arm assembly (40) includes an arm body assembly (41), a first bearing seat (42) and a second bearing seat (43), and a first arm seat (10) and a second arm seat (11) respectively fixed at both ends of the arm body assembly (41). The first bearing seat (42) is fixedly connected to the bearing groove surface (3), and the first bearing seat (42) is provided with an active through hole for pivotally connecting the rotating shaft (4). The second bearing seat (43) is fixedly connected to the bearing groove surface (3) and arranged at a distance from the first bearing seat (42), and the second bearing seat (43) is provided with... The driven through hole of the flip arm assembly (40) is pivotally connected; the first arm seat (10) is provided with a clamping connection structure for sleeved on the rotary shaft (4), and a keyway is opened on the peripheral wall of the rotary shaft (4); wherein, the clamping connection structure includes an opening groove (12) that runs radially through the rotary shaft (4) and an arm seat protrusion (14) that cooperates with the keyway on the rotary shaft (4), as well as a locking through hole and a locking member for tightening the opening groove (12); the second arm seat (11) is pivotally connected to the second shaft seat (43) through the driven through hole by a pin.

8. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 7, characterized in that, The body (1) has a fixed platform (13) protruding outward in the width direction of the bearing surface (15). The fixed platform (13) protrudes outward in the height direction of the fixed plate (2) to form a step. Part of the third plate (23) abuts against the step of the fixed platform (13).

9. The self-locking safety tilting mechanism for heavy-duty workpieces according to claim 8, characterized in that, The first arm seat (10) and the second arm seat (11) are each provided with a first extension (32) and a second extension (33) perpendicular to the first extension (32) at one end connected to the arm assembly (41). The first extension (32) and the second extension (33) are respectively fixed to two adjacent side walls of the arm assembly (41) by fasteners.

Images