600kn heavy load ejector pin for torque limiter

Abstract

This invention relates to the field of torque limiter pin technology, and discloses a 600KN heavy-duty pin for a torque limiter, comprising: a pin body disposed on the limiter, the pin body including a ball seat, a steel ball, a pin shaft, a disc spring assembly, a damping adjusting screw, a threaded pressure block, a threaded buffer sleeve, a cover, an anti-loosening screw assembly, a pin housing, a retaining ring, a wedge block assembly, and a spacer; the inner ring of the limiter has a ball groove, and the outer ring of the limiter has a through groove; the ball seat is fixedly installed in the ball groove by bolts, and the outer wall of the ball seat has a conical surface. This invention has a simple structure, reliable anti-loosening, good lubrication effect, low contact stress, and long service life; it can prevent screw loosening at any angle, and the load capacity is increased from the international maximum of approximately 330KN to over 600KN.

Description

Technical Field

[0001] This invention relates to the field of torque limiter pin technology, and more particularly to a 600KN heavy-duty pin for a torque limiter. Background Technology

[0002] Currently, pin-type torque limiters, as indispensable safety protection devices in mechanical transmission systems, are becoming increasingly important as industrial equipment develops towards larger scale, higher speed, and greater precision. At present, the global high-end torque limiter market is dominated by European and American companies such as Mayr (Germany), Ringfeder (Italy), and Formsprag-Clutch (USA), who, with their deep technological accumulation, precise manufacturing processes, and long-term engineering application data, monopolize the vast majority of the high-torque, high-reliability application market. Their pin unit products are characterized by high thrust accuracy (around ±5%), fast response speed (millisecond level), long service life, and stable performance. However, their technological barriers also lead to exceptionally high product prices, long delivery cycles, and slow response to customized services, becoming one of the factors restricting the independent development of high-end equipment in my country. To address this situation, a 600KN heavy-duty pin for torque limiters is designed. Summary of the Invention

[0003] To address the technical problems raised in the background art, the present invention provides a 600KN heavy-duty ejector pin for a torque limiter.

[0004] The present invention is achieved by the following technical solution: a 600KN heavy-duty ejector pin for a torque limiter, comprising: an ejector pin body disposed on the limiter, the ejector pin body comprising a ball seat, a steel ball, a pin shaft, a disc spring assembly, a damping adjustment screw, a threaded pressure block, a threaded buffer sleeve, a cover, an anti-loosening screw assembly, an ejector pin housing, a retaining ring, a wedge block assembly, and a spacer. The inner ring of the limiter has a ball groove, the outer ring of the limiter has a through groove, the ball seat is fixedly installed in the ball groove by bolts, and the outer wall of the ball seat has a conical surface.

[0005] As a further improvement to the above solution, the bottom end of the ejector housing is inserted into the through groove, and the ejector housing is connected to the outer ring of the limiter by bolts. The connection is firm and stable, providing reliable installation support for each component of the ejector and ensuring structural stability under heavy load conditions.

[0006] As a further improvement to the above solution, a retaining ring, a wedge block assembly, and a spacer are installed in the lower half of the ejector housing. The retaining ring, the wedge block assembly, and the spacer are stacked in a top-middle-bottom sequence. The wedge block assembly is adapted to the spacer and the retaining ring, and the wedge block assembly can slide relative to the conical surfaces of the spacer and the retaining ring.

[0007] As a further improvement to the above solution, a pin is provided inside the ejector housing. The bottom end of the pin passes through the retaining ring, the wedge block assembly, and the spacer and is adapted to the retaining ring, the wedge block assembly, and the spacer. The pin can slide relative to the spacer, the threaded pressure block, and the wedge block assembly. The retaining ring can slide relative to the inner hole of the ejector housing. A damping adjustment screw is provided at the upper end of the pin. Both the upper and lower parts of the pin are provided with through transverse oil passages, and a through intermediate oil passage is provided in the middle. This optimizes the lubrication path, realizes direct lubrication of each sliding contact surface, reduces friction loss, reduces contact stress, and further extends the service life of the ejector.

[0008] As a further improvement to the above solution, a ball socket is provided at the bottom end of the pin, and the upper half of the steel ball is wrapped in the ball socket at the bottom end of the pin. The steel ball can rotate freely, and the lower half of the steel ball is in close contact with the conical surface of the ball seat. The steel ball can slide along the conical surface.

[0009] As a further improvement to the above solution, the threaded pressure block is installed in the upper half of the ejector housing. The threaded pressure block and the ejector housing are threadedly connected as one unit. A cover is provided above the threaded pressure block. The cover and the threaded pressure block are bolted together as one unit. A set of anti-loosening screws is provided on the cover. The threaded buffer sleeve is sealed and installed on the inner hole of the threaded pressure block. The threaded buffer sleeve can slide up and down relative to the threaded pressure block. The threaded buffer sleeve, the threaded pressure block, and the pin form a sealed cavity, constituting an air chamber buffer structure, which can buffer the impact load during the ejector reset process, reduce the reset impact, and improve the structural stability.

[0010] As a further improvement to the above solution, the top end of the pin passes through the threaded pressure block and is inserted into the threaded buffer sleeve. The pin and the threaded buffer sleeve are threadedly connected as one unit, which is reliable and can realize the up and down sliding and buffering effect of the pin simultaneously, ensuring the coordination and stability of the pin's movement.

[0011] As a further improvement to the above solution, a compressible disc spring assembly is provided between the retaining ring and the threaded pressure block. The disc spring assembly is sleeved on the pin shaft, and the ejector housing is fixed to the outer ring of the limiter by bolts. The disc spring assembly can provide a stable clamping force to ensure the clamping effect of the wedge block assembly on the pin shaft, while also buffering vibrations under heavy load conditions and improving the impact resistance of the ejector.

[0012] As a further improvement to the above solution, the upper and lower parts of the pin are provided with through transverse oil passages, and the middle part is provided with through intermediate oil passages, which can realize the smooth flow of lubricating oil, fully lubricate the contact surfaces between the pin and each mating component, reduce friction and wear, reduce contact stress, and provide lubrication guarantee for the realization of 600KN heavy-load thrust.

[0013] As a further improvement to the above solution, the upper end of the ejector housing is provided with 19 evenly distributed anti-loosening inclined surfaces. Below the anti-loosening inclined surfaces are threads that cooperate with the threaded pressure block. The lower end face of the anti-loosening screw group is pressed against the anti-loosening inclined surface. The conical surface and the upper end face of the ball seat are transitioned through a special curved surface with continuous second derivative at the transition point. The number of anti-loosening screw groups (6 groups) and the number of anti-loosening inclined surfaces (19) are coprime, which can achieve stepless anti-loosening at any angle, ensure the stable pressure of the ejector disc spring group, improve the reliability of anti-loosening, avoid loosening of the threaded connection under heavy load conditions, and ensure the overall performance stability of the ejector. The transition of the conical surface and the upper end face of the ball seat through a special curved surface with continuous second derivative at the transition point can eliminate the soft impact during the steel ball sliding process, reduce the wear at the transition point, and improve the service life of the ejector.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention improves upon traditional ball joints by using a special curve where the second derivative is continuous at the transition point to eliminate soft impacts during ball slippage. Furthermore, it adds an air chamber buffer structure to buffer impact loads during the reset process. Additionally, it incorporates a beveled tooth anti-loosening structure, utilizing the coprime relationship between the screw and the bevel to provide stepless anti-loosening and ensure stable pressure on the ejector pin disc spring. Finally, the special wedge shape allows key contact pairs to self-adjust their contact surface size during slippage, combined with optimized direct lubrication channels, achieving a significant increase in thrust to 600KN. This invention features a simple structure, reliable anti-loosening, excellent lubrication, low contact stress, long service life, and screw anti-loosening at any angle, increasing the load capacity from the international maximum of approximately 330KN to over 600KN. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the ejector pin structure and installation of the present invention; Figure 2 This is a schematic diagram of the ball seat transition surface of the present invention; Figure 3 This is a schematic diagram of the anti-loosening inclined surface of the present invention.

[0016] Explanation of key symbols: 1. Ball seat; 1-1. Special curved surface; 2. Steel ball; 3. Pin; 4. Disc spring assembly; 5. Damping adjustment bolt; 6. Threaded pressure block; 7. Threaded buffer sleeve; 8. Cover; 9. Anti-loosening screw assembly; 10. Ejector pin housing; 10-1. Anti-loosening inclined surface; 11. Retaining ring; 12. Wedge block assembly; 13. Spacer. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0020] Please combine Figure 1 The torque limiter of this embodiment uses a 600KN heavy-duty ejector pin, which includes: an ejector pin body disposed on the limiter, the ejector pin body including a ball seat 1, a steel ball 2, a pin shaft 3, a disc spring assembly 4, a damping adjustment screw 5, a threaded pressure block 6, a threaded buffer sleeve 7, a cover 8, an anti-loosening screw assembly 9, an ejector pin housing 10, a retaining ring 11, a wedge block assembly 12, and a spacer 13; The inner ring of the limiter has a ball groove, the outer ring of the limiter has a through groove, the ball seat 1 is fixedly installed in the ball groove by bolts, and the outer wall of the ball seat 1 has a conical surface.

[0021] The bottom end of the ejector housing 10 is inserted into the through groove. The ejector housing 10 is connected to the outer ring of the limiter by bolts. The connection is firm and stable, providing reliable installation support for each component of the ejector and ensuring structural stability under heavy load conditions.

[0022] The lower half of the ejector housing 10 is equipped with a retaining ring 11, a wedge block assembly 12, and a spacer 13. The retaining ring 11, the wedge block assembly 12, and the spacer 13 are stacked in a top-middle-bottom order. The wedge block assembly 12 is adapted to the spacer 13 and the retaining ring 11. The wedge block assembly 12 can slide relative to the conical surfaces of the spacer 13 and the retaining ring 11.

[0023] The ejector housing 10 is provided with a pin 3. The bottom end of the pin 3 passes through the retaining ring 11, the wedge block group 12 and the spacer 13 and is adapted to the retaining ring 11, the wedge block group 12 and the spacer 13. The pin 3 can slide relative to the spacer 13, the threaded pressure block 6 and the wedge block group 12. The retaining ring 11 can slide relative to the inner hole of the ejector housing 10. The upper end of the pin 3 is provided with a damping adjustment screw 5. The upper and lower parts of the pin 3 are provided with through transverse oil passages, and the middle part is provided with through intermediate oil passages to optimize the lubrication path, realize direct lubrication of each sliding contact surface, reduce friction loss, reduce contact stress and further extend the service life of the ejector.

[0024] The bottom end of the pin 3 is provided with a ball socket, and the upper half of the steel ball 2 is wrapped in the ball socket at the bottom end of the pin 3. The steel ball 2 can rotate freely, and the lower half of the steel ball 2 is in close contact with the conical surface of the ball seat 1. The steel ball 2 can slide along the conical surface.

[0025] The threaded pressure block 6 is installed in the upper half of the ejector housing 10. The threaded pressure block 6 and the ejector housing 10 are threadedly connected as one unit. A cover 8 is provided above the threaded pressure block 6. The cover 8 and the threaded pressure block 6 are bolted together as one unit. The cover 8 is provided with 6 sets of anti-loosening screws 9. The threaded buffer sleeve 7 is sealed and installed on the inner hole of the threaded pressure block 6. The threaded buffer sleeve 7 can slide up and down relative to the threaded pressure block 6. The threaded buffer sleeve 7, the threaded pressure block 6, and the pin 3 form a sealed cavity, constituting an air chamber buffer structure, which can buffer the impact load during the ejector reset process, reduce the reset impact, and improve the structural stability.

[0026] The top end of the pin 3 passes through the threaded pressure block 6 and is inserted into the threaded buffer sleeve 7. The pin 3 and the threaded buffer sleeve 7 are threadedly connected as one unit, which is reliable and can realize the up and down sliding and buffering effect of the pin 3 simultaneously, ensuring the coordination and stability of the pin movement.

[0027] A compressible disc spring assembly 4 is provided between the retaining ring 11 and the threaded pressure block 6. The disc spring assembly 4 is sleeved on the pin 3. The ejector housing 11 is fixed to the outer ring of the limiter by bolts. The disc spring assembly 4 can provide a stable clamping force to ensure the clamping effect of the wedge block assembly 12 on the pin 3. At the same time, it can buffer the vibration under heavy load conditions and improve the impact resistance of the ejector.

[0028] The upper and lower parts of the pin 3 are provided with through transverse oil passages, and the middle part is provided with through intermediate oil passages, which can realize the smooth flow of lubricating oil, fully lubricate the contact surfaces between the pin 3 and each mating component, reduce friction and wear, reduce contact stress, and provide lubrication guarantee for the realization of 600KN heavy-load thrust.

[0029] The upper end of the ejector housing 10 is provided with 19 evenly distributed anti-loosening inclined surfaces 10-1. Below the anti-loosening inclined surfaces 10-1, there are threads that cooperate with the threaded pressure block 6. The lower end face of the anti-loosening screw group 9 is pressed against the anti-loosening inclined surface 10-1. The conical surface and the upper end face of the ball seat 1 are transitioned through a special curved surface 1-1 with continuous second derivative at the transition point. The number of anti-loosening screw groups 9 (6 groups) and the number of anti-loosening inclined surfaces 10-1 (19) are coprime, which can realize stepless anti-loosening at any angle, ensure the stable pressure of the ejector disc spring group 4, improve the reliability of anti-loosening, avoid loosening of the threaded connection under heavy load conditions, and ensure the overall stability of the ejector. The transition of the conical surface and the upper end face of the ball seat 1 through the special curved surface 1-1 with continuous second derivative at the transition point can eliminate the soft impact of the steel ball 2 during the sliding process, reduce the wear at the transition point, and improve the service life of the ejector.

[0030] The implementation principle of a 600KN heavy-duty ejector pin for a torque limiter in this application embodiment is as follows: The present invention will describe the assembly, installation, use, and reset principles and functions in conjunction with the accompanying drawings.

[0031] Assembly description of this invention: First, place the ejector housing 10 on a specific tooling. After freezing, install the spacer 13 into the mating hole at the lower end of the ejector housing 10, with the end face flush. Apply grease to the upper end face of the spacer 13. Then, place the wedge block assembly 12 in sequence on the upper end face of the spacer 13. Next, install the steel ball 2 into the ball socket of the pin 3. Due to the special design, the steel ball 2 is stuck in the ball socket and will not fall out, while not affecting the free rotation of the steel ball 2. Then, slowly insert the assembled pin 3 and steel ball 2 from the upper end of the ejector housing 10 until the lower end of the pin 3 and the inner hole of the spacer 13 are properly mated.

[0032] Further, the retaining ring 11 is placed on the pin 3 with its conical surface facing down and slides down freely. Then, the disc spring assembly 4 is placed on the pin 3 and slides down freely as shown in the figure. Further, the cover 8 is placed on the threaded pressure block 6 and bolted to secure it. The assembled threaded pressure block 6 and cover 8 are screwed onto the thread at the upper end of the inner hole of the ejector housing 10 and tightened. In this way, the threaded pressure block 6 compresses the disc spring assembly 4, the disc spring assembly 4 then squeezes the retaining ring 11, and finally the wedge assembly 12 is squeezed towards the axis under the pressure of the retaining ring 11, and finally hugs the pin 3.

[0033] Next, install the threaded buffer sleeve 7 on the upper end of the pin 3, with its outer surface fitting into the inner hole of the threaded pressure block 6; finally, install the damping adjustment screw 5 and the anti-loosening screw group 9 into place respectively, thus completing the partial assembly of the ejector pin unit.

[0034] Installation instructions for this invention: First, install ball seat 1 into the mounting hole of the inner ring of the limiter and tighten it with bolts. Then apply grease. Next, install the assembled ejector pin into the mounting hole of the limiter outer ring and tighten it with bolts. At this time, the steel ball 2 and the conical surface of ball seat 1 are in close contact, and the installation is complete.

[0035] Instructions for use of this invention: During normal use, loosening the damping adjustment screw 5 allows the steel ball 2 and ball seat 1 to transmit torque through compression. When the torque is overloaded, the inner and outer rings will misalign, and the steel ball 2 will slide upward along the ball seat 1. Simultaneously, the wedge block assembly 12 slides towards the axis of rotation under the pressure of the pin 3, and the threaded buffer sleeve 7 slides upward relative to the threaded pressure block 6. When the wedge 12 slides to the point where it can just pass through the lower end of the pin 3, the overload disengagement action is completed, and finally the steel ball 2 completely slides out of the conical surface of the ball seat 1 to the end face. During this process, the steel ball 2 passes through two transition points of the transition curve between the conical surface and the end face. Compared with the rounded corner transition, the wear at the transition point of the special curve 1-1 is greatly improved. In addition, compared with the conventional ring direct cutting structure, the special surface of the wedge block assembly 12 causes the curvature of the wedge block assembly 12 and the pin 3 to gradually approach each other during the sliding process, and the actual contact surface gradually expands, thus resulting in better pressure bearing effect and achieving a breakthrough progress of 600KN for the ejector pin.

[0036] Introduction to the reset function of this invention: Before resetting, tighten the damping adjusting screw 5 to block the transverse oil passage at the upper end of the pin. Then, with the help of the tool, press down the threaded buffer sleeve 7 to drive the pin 3 to slide downward. When the pin 1 slides to just pass through the wedge block group 12, under the strong pressure of the disc spring group 4 and the action of the cone surface of the stop block 11 and the spacer 13, the wedge block group 12 quickly retracts inward, pushing the pin 3 to move downward quickly. Since the threaded buffer sleeve 7, the pin 3 and the threaded pressure block 6 form a closed cavity, this cavity is continuously compressed during the resetting process. The force of the high-pressure gas inside offsets part of the pin impact force, so the resetting impact is greatly reduced. If necessary, some grease can be injected in advance to fill the gap and increase the gas compression ratio to provide a better buffering effect.

[0037] Introduction to the anti-loosening principle of this invention: The anti-loosening screw assembly 9 and the upper end face of the ejector housing 10 form a structure similar to a super nut, which inherently has excellent anti-loosening effect. Adding an anti-loosening ramp 10-1 further enhances this effect. When the threaded pressure block 6 tends to loosen, the anti-loosening screw assembly 9 will tend to slide upwards along the anti-loosening ramp 10-1, thus tightening the anti-loosening screw assembly 9 even more, resulting in even better anti-loosening performance. Furthermore, the number of evenly distributed screw assemblies 9 is adjusted to be coprime with the number of anti-loosening ramps 10-1 (the principle is similar to the misalignment of vernier caliper scales), ensuring that at any angle during tightening force adjustment, at least one loosening screw assembly 9 is pressed against the anti-loosening ramp 10-1, achieving a stepless anti-loosening effect.

[0038] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A 600KN heavy-duty ejector pin for a torque limiter, characterized in that, include: The ejector body is provided on the limiter, and the ejector body includes a ball seat (1), a steel ball (2), a pin (3), a disc spring assembly (4), a damping adjustment screw (5), a threaded pressure block (6), a threaded buffer sleeve (7), a cover (8), an anti-loosening screw assembly (9), an ejector housing (10), a retaining ring (11), a wedge assembly (12), and a spacer (13). The inner ring of the limiter has a ball groove, the outer ring of the limiter has a through groove, the ball seat (1) is fixedly installed in the ball groove by bolts, and the outer wall of the ball seat (1) has a conical surface.

2. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 1, characterized in that, The bottom end of the ejector housing (10) is inserted into the through groove. The ejector housing (10) is connected to the outer ring of the limiter by bolts. The connection is firm and stable, providing reliable installation support for each component of the ejector and ensuring structural stability under heavy load conditions.

3. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 2, characterized in that, The lower half of the ejector housing (10) is equipped with a retaining ring (11), a wedge block group (12) and a spacer (13). The retaining ring (11), the wedge block group (12) and the spacer (13) are stacked in order of top, middle and bottom. The wedge block group (12) is adapted to the spacer (13) and the retaining ring (11). The wedge block group (12) can slide relative to the conical surface of the spacer (13) and the retaining block (11).

4. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 3, characterized in that, The ejector housing (10) is provided with a pin (3). The bottom end of the pin (3) passes through the retaining ring (11), the wedge block group (12) and the spacer (13) and is adapted to the retaining ring (11), the wedge block group (12) and the spacer (13). The pin (3) can slide relative to the spacer (13), the threaded pressure block (6) and the wedge block group (12). The retaining ring (11) can slide relative to the inner hole of the ejector housing (10). The upper end of the pin (3) is provided with a damping adjustment screw (5). The upper and lower parts of the pin (3) are provided with through transverse oil passages, and the middle part is provided with through intermediate oil passages to optimize the lubrication path, realize direct lubrication of each sliding contact surface, reduce friction loss, reduce contact stress, and further extend the service life of the ejector.

5. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 4, characterized in that, The bottom end of the pin (3) is provided with a ball socket. The upper half of the steel ball (2) is wrapped in the ball socket at the bottom end of the pin (3). The steel ball (2) can rotate freely. The lower half of the steel ball (2) is in close contact with the conical surface of the ball seat (1). The steel ball (2) can slide along the conical surface.

6. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 4, characterized in that, The threaded pressure block (6) is installed in the upper half of the ejector housing (10). The threaded pressure block (6) and the ejector housing (10) are threaded together. A cover (8) is provided above the threaded pressure block (6). The cover (8) and the threaded pressure block (6) are bolted together. The cover (8) is provided with 6 sets of anti-loosening screws (9). The threaded buffer sleeve (7) is sealed and installed on the inner hole of the threaded pressure block (6). The threaded buffer sleeve (7) can slide up and down relative to the threaded pressure block (6). The threaded buffer sleeve (7), the threaded pressure block (6), and the pin (3) form a sealed cavity, which constitutes an air chamber buffer structure. It can buffer the impact load during the ejector reset process, reduce the reset impact, and improve the structural stability.

7. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 6, characterized in that, The top end of the pin (3) passes through the threaded pressure block (6) and is inserted into the threaded buffer sleeve (7). The pin (3) and the threaded buffer sleeve (7) are threaded together as one unit, which is reliable and can realize the up and down sliding and buffering effect of the pin (3) simultaneously, ensuring the coordination and stability of the pin movement.

8. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 7, characterized in that, A compressible disc spring assembly (4) is provided between the retaining ring (11) and the threaded pressure block (6). The disc spring assembly (4) is sleeved on the pin (3). The ejector housing (11) is fixed to the outer ring of the limiter by bolts. The disc spring assembly (4) can provide a stable clamping force to ensure the clamping effect of the wedge block assembly (12) on the pin (3). At the same time, it can buffer the vibration under heavy load conditions and improve the impact resistance of the ejector.

9. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 1, characterized in that, The upper and lower parts of the pin (3) are provided with through transverse oil passages, and the middle part is provided with through intermediate oil passages, which can realize the smooth flow of lubricating oil, fully lubricate the contact surfaces of the pin (3) and each mating component, reduce friction and wear, reduce contact stress, and provide lubrication guarantee for the realization of 600KN heavy-load thrust.

10. The 600KN heavy-duty ejector pin for the torque limiter as described in claim 1, characterized in that, The upper end of the ejector housing (10) is provided with 19 evenly distributed anti-loosening inclined surfaces (10-1). The lower part of the anti-loosening inclined surface (10-1) is provided with a thread that cooperates with the threaded pressure block (6). The lower end face of the anti-loosening screw group (9) is pressed against the anti-loosening inclined surface (10-1). The conical surface and the upper end face of the ball seat (1) are transitioned through a special curved surface (1-1) where the second derivative of the transition point is continuous. The number of anti-loosening screw groups (9) (6 groups) and the number of anti-loosening inclined surfaces (10-1) (19) are coprime, which can realize stepless anti-loosening at any angle, ensure the stable pressure of the ejector disc spring group (4), improve the reliability of anti-loosening, avoid loosening of the threaded connection under heavy load conditions, and ensure the overall performance stability of the ejector. The conical surface and the upper end face of the ball seat (1) are transitioned through a special curved surface (1-1) where the second derivative of the transition point is continuous, which can eliminate the soft impact of the steel ball (2) during the sliding process, reduce the wear at the transition point, and improve the service life of the ejector.

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