Safety coupling safety pin

Abstract

The utility model discloses a kind of safety coupling safety pins, it is related to coupling technical field, including coupling, first telescopic safety pin axle, second telescopic safety pin axle are connected together using limit spring, it is realized when the torque of coupling occurs to the use of coupling and plays limit protection, first trapezoidal clamping block, second trapezoidal clamping block when stretching first telescopic safety pin axle, second telescopic safety pin axle, multiple elastic buffer pads contact with limit inclined plate one side, realize first trapezoidal clamping block, second trapezoidal clamping block are fixedly clamped in first through slot, second through slot one side, when coupling occurs torsion, the multiple elastic buffer pads of first positioning inclined plate, second positioning inclined plate outer wall are sequentially separated from limit inclined plate according to the torque of coupling when thus so that first trapezoidal clamping block, second trapezoidal clamping block are separated from first clamping hoop, second clamping hoop, can quickly stop coupling work while providing sufficient buffering effect for coupling.

Description

Technical Field

[0001] This utility model relates to the field of coupling technology, and in particular to a safety pin for a safety coupling. Background Technology

[0002] Couplings, as key components in mechanical transmission systems that connect two shafts (driving shaft and driven shaft) and transmit motion and torque, are widely used in various industrial equipment, such as motors, pumps, compressors, and conveyors. Their performance directly affects the stability, efficiency, and safety of the entire transmission system. In traditional coupling applications, a common and serious challenge is overload protection. When equipment experiences jamming, sudden load changes, starting shocks, or misoperation, the torque transmitted to the coupling can drastically exceed its rated design value.

[0003] A safety pin flexible coupling is proposed in patent CN202108895U. This patent includes a nut, a pin, an elastic sleeve, a sliding bearing, a half-coupling, and a safety pin. The safety pin connects the half-coupling II to the working end mechanical equipment. When the drive motor is running, if the load on the working end mechanical equipment exceeds the set value of the safety pin, the safety pin breaks due to overload shearing, separating the drive end and the working end, thereby protecting the drive motor and the working end equipment (such as a reducer). This effectively solves the problem that flexible couplings cannot achieve mechanical torque overload protection. Upon restarting, the equipment can continue to work after replacing the safety pin. However, the following problems still exist in this patent:

[0004] The above-mentioned protection of couplings requires the machine to be stopped every time an overload occurs, and professional personnel must disassemble the coupling cover, find and replace the sheared safety pin. This results in high maintenance costs and long downtime. In addition, the impact at the moment of disengagement is large, there is no buffering mechanism, the protection accuracy is unstable, and there are safety hazards.

[0005] To address the above issues, a safety pin for the safety coupling needs to be designed to overcome them. Utility Model Content

[0006] The main objective of this invention is to provide a safety pin for a safety coupling, which can effectively solve the problems in the background art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A safety pin for a safety coupling includes a coupling. A first clamp and a second clamp are respectively connected to both ends of the outer wall of the coupling. A first through groove is formed on the top of the first clamp. A limiting inclined plate is connected to the end of the first clamp near the first through groove. A connecting plate is connected to the end of the first clamp near the limiting inclined plate. A first telescopic safety pin is connected to the end of the connecting plate near the limiting inclined plate. A first connecting spring is connected to the outer wall of the first telescopic safety pin. A first trapezoidal locking block is connected to the end of the first telescopic safety pin away from the connecting plate. A first positioning inclined plate is connected to the top of the first trapezoidal locking block. Multiple elastic buffer pads are connected to one side of both the first trapezoidal locking block and the first positioning inclined plate. A limiting spring is connected to the end of the connecting plate away from the first telescopic safety pin.

[0009] As a preferred embodiment of this utility model, a second through groove is provided at one end of the top of the second clamp, and a limiting inclined plate is connected to the end of the second clamp near the second through groove. A second telescopic safety pin is connected to the end of the second clamp near the limiting inclined plate. A second connecting spring is connected to the outer wall of the second telescopic safety pin. A second trapezoidal locking block is connected to the end of the second telescopic safety pin away from the limiting spring. A second positioning inclined plate is connected to the top of the second trapezoidal locking block. Multiple elastic buffer pads are connected to one side of the second trapezoidal locking block and the second positioning inclined plate. A limiting sleeve is sleeved on the outer wall of the first telescopic safety pin and the second telescopic safety pin near the first clamp and the second clamp, respectively.

[0010] As a preferred embodiment of this utility model, one end of the first clamp and the second clamp are both threadedly fixedly connected to a locking rod, and the top of the locking rod is threadedly connected to a limit block. The first clamp and the second clamp are both sleeved on both ends of the outer wall of the coupling.

[0011] As a preferred embodiment of this utility model, the first clamp and the second clamp are both fixedly connected to the limiting inclined plate, the first clamp and the second clamp are both fixedly connected to the connecting plate, and the connecting plate is fixedly connected to the limiting spring.

[0012] As a preferred embodiment of this utility model, the connecting plate is rotatably connected to the first telescopic safety pin, the first telescopic safety pin is fixedly connected to the first connecting spring, and the first telescopic safety pin is rotatably connected to the first trapezoidal snap-fit ​​block.

[0013] As a preferred embodiment of this utility model, the first trapezoidal snap-fit ​​block is fixedly connected to the first positioning inclined plate, and both the first trapezoidal snap-fit ​​block and the first positioning inclined plate are fixedly connected to the plurality of elastic buffer pads, with the elastic buffer pads contacting one end of the limiting inclined plate.

[0014] As a preferred embodiment of this utility model, the second telescopic safety pin is rotatably connected to the second trapezoidal snap-fit ​​block, the second telescopic safety pin is fixedly connected to the second connecting spring, the second trapezoidal snap-fit ​​block is fixedly connected to the second positioning inclined plate, and the limiting cylinder is fixedly sleeved on one end of the outer wall of the first telescopic safety pin and the second telescopic safety pin.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The safety pins of this safety coupling are fixed to both ends of the outer wall of the coupling via a locking rod using a first clamp and a second clamp, thus limiting the coupling's movement. The first and second telescopic safety pins are connected by a limit spring, providing protection by limiting the coupling's movement when torque is applied. When the first and second trapezoidal locking blocks are stretched, the first and second positioning inclined plates follow the first telescopic safety pin. When the second telescopic safety pin moves to one end, multiple elastic buffer pads come into contact with one side of the limiting inclined plate, thus fixing the first trapezoidal snap-fit ​​block and the second trapezoidal snap-fit ​​block into one side of the first through groove and the second through groove. When the coupling is twisted, the multiple elastic buffer pads on the outer wall of the first positioning inclined plate and the second positioning inclined plate disengage from the limiting inclined plate in sequence according to the torque of the coupling, thereby causing the first trapezoidal snap-fit ​​block and the second trapezoidal snap-fit ​​block to disengage from the first clamp and the second clamp. This can quickly stop the operation of the coupling while providing sufficient buffering effect for the coupling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of the first clamp and the second clamp of this utility model;

[0020] Figure 3 This is a schematic diagram of structure A of this utility model;

[0021] Figure 4 This is a schematic diagram of the installation structure of the first trapezoidal snap-fit ​​block and the second trapezoidal snap-fit ​​block of this utility model.

[0022] In the diagram: 1. Coupling; 2. First clamp; 3. Second clamp; 4. Locking rod; 5. Limiting block; 6. First through slot; 7. Second through slot; 8. Limiting inclined plate; 9. First trapezoidal snap-fit ​​block; 10. Connecting plate; 11. Limiting spring; 12. First positioning inclined plate; 13. Elastic buffer pad; 14. First telescopic safety pin; 15. First connecting spring; 16. Limiting cylinder; 17. Second telescopic safety pin; 18. Second connecting spring; 19. Second trapezoidal snap-fit ​​block; 20. Second positioning inclined plate. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figures 1-4 As shown, a safety pin for a safety coupling includes a coupling 1. A first clamp 2 and a second clamp 3 are respectively connected to both ends of the outer wall of the coupling 1. A first through groove 6 is provided on the top of the first clamp 2. A limiting inclined plate 8 is connected to one end of the first clamp 2 near the first through groove 6. A connecting plate 10 is connected to one end of the first clamp 2 near the limiting inclined plate 8. A first telescopic safety pin 14 is connected to one end of the connecting plate 10 near the limiting inclined plate 8. A first connecting spring 15 is connected to the outer wall of the first telescopic safety pin 14. A first trapezoidal locking block 9 is connected to one end of the first telescopic safety pin 14 away from the connecting plate 10. A first positioning inclined plate 12 is connected to the top of the first trapezoidal locking block 9. Multiple elastic buffer pads 13 are connected to one side of both the first trapezoidal locking block 9 and the first positioning inclined plate 12. A limiting spring 11 is connected to one end of the connecting plate 10 away from the first telescopic safety pin 14.

[0025] Both the first clamp 2 and the second clamp 3 have a locking rod 4 threadedly connected to one end. The top of the locking rod 4 is threadedly connected to a limit block 5. Both the first clamp 2 and the second clamp 3 are sleeved on both ends of the outer wall of the coupling 1. Both the first clamp 2 and the second clamp 3 are fixedly connected to the limiting inclined plate 8. Both the first clamp 2 and the second clamp 3 are fixedly connected to the connecting plate 10. The connecting plate 10 is fixedly connected to the limiting spring 11. The connecting plate 10 is rotatably connected to the first telescopic safety pin 14. The first telescopic safety pin 14 is fixedly connected to the first connecting spring 15. The first telescopic safety pin 14 is rotatably connected to the first trapezoidal snap-fit ​​block 9. The first trapezoidal snap-fit ​​block 9 is fixedly connected to the first positioning inclined plate 12. Both the first trapezoidal snap-fit ​​block 9 and the first positioning inclined plate 12 are fixedly connected to multiple elastic buffer pads 13. The elastic buffer pads 13 are in contact with one end of the limiting inclined plate 8.

[0026] The second clamp 3 has a second through groove 7 at one end of its top. The end of the second clamp 3 near the second through groove 7 is connected to a limiting inclined plate 8. The end of the second clamp 3 near the limiting inclined plate 8 is connected to a second telescopic safety pin 17. The outer wall of the second telescopic safety pin 17 is connected to a second connecting spring 18. The end of the second telescopic safety pin 17 away from the limiting spring 11 is connected to a second trapezoidal locking block 19. The top of the second trapezoidal locking block 19 is connected to a second positioning inclined plate 20. One side of the second trapezoidal locking block 19 and the second positioning inclined plate 20 are each connected to a plurality of elastic buffer pads 13. The outer walls of the first telescopic safety pin 14 and the second telescopic safety pin 17 near the first clamp 2 and the second clamp 3 are each fitted with a limiting sleeve 16.

[0027] The second telescopic safety pin 17 is rotatably connected to the second trapezoidal snap-fit ​​block 19, the second telescopic safety pin 17 is fixedly connected to the second connecting spring 18, the second trapezoidal snap-fit ​​block 19 is fixedly connected to the second positioning inclined plate 20, and the limiting cylinder 16 is fixedly sleeved on one end of the outer wall of the first telescopic safety pin 14 and the second telescopic safety pin 17.

[0028] Specifically, in this embodiment, firstly, the first clamp 2 and the second clamp 3 are respectively fitted onto the outer walls of both ends of the coupling 1, and their positions are adjusted so that they fit against the flange or designated mounting surface of the coupling 1. Then, one or more locking rods 4 are passed through the preset mounting holes on the first clamp 2 and the second clamp 3, and locked with fasteners such as nuts, thereby firmly fixing the entire device onto the coupling 1. This step ensures that the protection mechanism and the coupling body become an integral part and rotate synchronously. The first telescopic safety pin 14 and the second telescopic safety pin 17 fix the two ends of the limit spring 11 to their inner ends respectively. The limit spring 11 is preferably a high-strength tension spring, and its elastic force determines the disengagement torque threshold of this device. On the outer wall of the first telescopic safety pin 14 and the second telescopic safety pin 17, near the end connected to the clamp, a limit sleeve 16 is fixedly fitted. The inner diameter of the limit sleeve 16 is precisely matched with the outer diameter of the pin, and its main function is... The first telescopic safety pin 14 provides guidance during its extension and retraction to prevent radial swaying or bending and ensure smooth movement. At the other end of the first telescopic safety pin 14, the first connecting spring 15 is fixedly connected, and the first trapezoidal snap-fit ​​block 9 is rotatably connected to this end. This rotatable connection allows the first trapezoidal snap-fit ​​block 9 to make slight angle adaptive adjustments when it is engaged or disengaged from the through slot, ensuring smooth movement. Similarly, at the other end of the second telescopic safety pin 17, the second connecting spring 18 is fixedly connected, and the second trapezoidal snap-fit ​​block 19 is rotatably connected to this end.

[0029] A first positioning inclined plate 12 is fixedly installed on the top of the first trapezoidal snap-fit ​​block 9. A second positioning inclined plate 20 is fixedly installed on the top of the second trapezoidal snap-fit ​​block 19. Multiple elastic buffer pads 13 are evenly bonded or fixed by screws on the outer walls of the first positioning inclined plate 12 and the second positioning inclined plate 20, i.e. the side facing the limiting inclined plate. The elastic buffer pads 13 can be made of materials with excellent elasticity and wear resistance such as polyurethane and high elasticity rubber. The assembled first telescopic safety pin 14 assembly is installed on the corresponding mounting seat of the first clamp 2 through its limiting cylinder 16 to ensure that the first trapezoidal snap-fit ​​block 9 can be aligned with the first through groove 6. The assembled second telescopic safety pin 17 assembly is installed on the second clamp 3 in the same way so that the second trapezoidal snap-fit ​​block 19 is aligned with the second through groove 7. At this time, under the pre-tightening force of the limiting spring 11, the first trapezoidal snap-fit ​​block 9 and the second trapezoidal snap-fit ​​block 19 are pulled towards each other and respectively snap into the first through groove 6 and the second through groove 7, completing the final assembly of the entire device.

[0030] Upon startup, coupling 1 begins to rotate and transmit torque. Since the torque does not exceed the set value, the first trapezoidal locking block 9 and the second trapezoidal locking block 19 are firmly locked in the first through groove 6 and the second through groove 7 under the tension of the limiting spring 11. At this time, the first clamp 2 and the second clamp 3 are rigidly connected through these two trapezoidal blocks, and power is smoothly transmitted from the driving end to the driven end. The elastic buffer pads 13 on the first positioning inclined plate 12 and the second positioning inclined plate 20 are in close contact with the inclined surface of the limiting inclined plate 8, but since the force does not reach the point of deformation, the system remains stable. When a fault such as stalling or jamming occurs at the working end, causing the torque to rise sharply and exceed the safety threshold, the overload torque is transmitted to the first clamp 2 and the second clamp 3 through coupling 1. Due to the inclined surface effect between the first trapezoidal locking block 9, the second trapezoidal locking block 19 and the first through groove 6 and the second through groove 7, the excessive torque will generate an axial component force, attempting to push the first trapezoidal locking block 9 out of the first through groove 6 and the second trapezoidal locking block 19 out of the second through groove 7. 9 is pushed out from the second through slot 7. This thrust overcomes the tension of the limiting spring 11, causing the first telescopic safety pin 14 and the second telescopic safety pin 17 to be stretched against each other and begin to move outward. Due to manufacturing tolerances or uneven force, the multiple elastic buffer pads 13 on the first positioning ramp 12 and the second positioning ramp 20 will not simultaneously detach from the ramp surface of the limiting ramp 8. Usually, the outermost or most stressed elastic buffer pad 13 will be compressed first and begin to slide out of the constraint range of the limiting ramp 8. Each elastic buffer pad 13 will undergo elastic deformation during the process of detaching from the limiting ramp 8, thereby absorbing a portion of the impact energy. This process is continuous and gradual. After one pad detaches, the next pad continues to bear the buffering task until all elastic buffer pads 13 have detached.

[0031] Once all the elastic buffer pads 13 have disengaged from the limiting inclined plate 8, the first trapezoidal locking block 9 and the second trapezoidal locking block 19 have completely slid out of the first through groove 6 and the second through groove 7. At this point, the power transmission path between the first clamp 2 and the second clamp 3 is completely cut off. The driven end of the coupling 1 loses power and quickly stops rotating, thus protecting the motor and the load equipment. After troubleshooting the fault at the working end, no parts need to be replaced. The operator only needs to manually push the first telescopic safety pin 14 and the second telescopic safety pin 17 towards the center to overcome the tension of the limiting spring 11, so that the first trapezoidal locking block 9 and the second trapezoidal locking block 19 are realigned and locked into the first through groove 6 and the second through groove 7. After hearing or feeling the "click" sound of the trapezoidal blocks locking into place, the equipment has returned to standby mode and can be restarted immediately. The whole process is simple and quick, greatly shortening maintenance time.

[0032] It should be noted that this utility model is a safety pin for a safety coupling. In use, the first clamp 2 and the second clamp 3 are firmly fixed to both ends of the outer wall of the coupling 1 by the locking rod 4, providing a stable installation base for the entire protection mechanism. The first telescopic safety pin 14 and the second telescopic safety pin 17 are pulled together by the limiting spring 11, keeping them in their initial balanced position. At this time, the first trapezoidal locking block 9 and the second trapezoidal locking block 19 installed at the ends of the pins are precisely pushed into the first through groove 6 of the first clamp 2 and the second through groove 7 of the second clamp 3, respectively. The trapezoidal shape of the trapezoidal snap-fit ​​block creates a self-locking structure within the through slot, effectively resisting tangential forces under normal operation. Simultaneously, multiple elastic buffer pads 13 fixed to the first trapezoidal snap-fit ​​block 9 and the first positioning inclined plate 12, as well as multiple elastic buffer pads 13 fixed to the second trapezoidal snap-fit ​​block 19 and the second positioning inclined plate 20, are tightly pressed against the surface of the corresponding limiting inclined plate 8 under the tension of the limiting spring 11. At this time, the torque of the drive shaft is transmitted to the first clamp 2 and the second clamp 3 through the coupling 1. Then, through the locking of the first trapezoidal snap-fit ​​block 9 and the second trapezoidal snap-fit ​​block 19 with the first through slot 6 and the second through slot 7, the power is reliably transmitted to the driven shaft, enabling normal operation of the equipment. The first connecting spring 15 and the second connecting spring 18 are in a pre-compressed state, working together with the limiting spring 11 to ensure the system is stable and free from shaking.

[0033] The overload torque is converted into a huge tangential force acting on the first trapezoidal locking block 9 and the second trapezoidal locking block 19. This force begins to overcome the combined force of the limiting spring 11, the first connecting spring 15, and the second connecting spring 18, attempting to stretch the first telescopic safety pin 14 and the second telescopic safety pin 17 in opposite directions. Since the elastic buffer pads 13 are arranged side by side and have a certain degree of elasticity, they do not all instantly detach from the limiting inclined plate 8 in the initial stage of the pin being stretched. Instead, according to the magnitude of the torque, they detach from the surface of the limiting inclined plate 8 one by one, starting from the elastic buffer pad closest to the torque input end, i.e., the point of maximum force. The detachment process of each elastic buffer pad 13 is a small energy absorption and release process. This sequential detachment mechanism decomposes the one-time, violent impact force into a series of continuous, slight detachment actions. This not only greatly buffers the impact caused by overload and avoids damage to the equipment from rigid impact, but also produces a gradual and perceptible "slippage" or "stagnation" phenomenon, playing a mechanical warning role.

[0034] As the torque continues to increase, all the elastic buffer pads 13 will eventually completely detach from the limiting inclined plate 8. At this time, the first trapezoidal locking block 9 and the second trapezoidal locking block 19, which have lost the frictional resistance of the elastic buffer pads, will be quickly pushed outward along the inclined surfaces of the first through groove 6 and the second through groove 7 under the action of huge tangential force. Once the first trapezoidal locking block 9 completely detaches from the first through groove 6 and the second trapezoidal locking block 19 completely detaches from the second through groove 7, the mechanical connection between the first clamp 2 and the second clamp 3 will be completely cut off. The power of the drive shaft can no longer be transmitted to the driven shaft. The driven end working end of the coupling 1 will quickly stop rotating due to the loss of power, thereby effectively protecting the core equipment such as the motor and reducer from damage. After detachment, the first telescopic safety pin 14 and the second telescopic safety pin 17 will automatically retract and reset to the middle under the pulling force of the limiting spring 11. The limiting cylinder 16 plays a guiding and limiting role in this process to prevent the pin from moving excessively or deviating. At this time, the first trapezoidal locking block 9 and the second trapezoidal locking block 19 have returned to a position that makes it easy to realign the first through groove 6 and the second through groove 7.

[0035] Compared to the prior art and common existing technologies that use a safety pin with a preset shear strength to rigidly connect the driving and driven ends of the coupling, when the torque exceeds the set value, the huge shear force will directly cause the safety pin to break, thereby cutting off the power transmission. Once an overload occurs, the core component "safety pin" will be scrapped and must be replaced. This not only increases the cost of spare parts, but also causes the equipment to be shut down for too long due to replacement and re-alignment, which seriously affects the continuity of production. At the same time, the shear threshold of the safety pin is affected by a variety of factors such as materials, processing precision, and heat treatment, and the consistency and reliability of its protection accuracy are difficult to guarantee. The core protection mechanism adopted by this utility model is "mechanical disengagement and automatic reset". It uses the pre-tightening force of the limit spring 11 to firmly lock the first trapezoidal locking block 9 and the second trapezoidal locking block 19 in the first through groove 6 and the second through groove 7 to realize the power transmission. When the axial component of the overload torque exceeds the tension of the limit spring 11, the trapezoidal locking block will slide out along the inclined surface of the through groove, achieving power disengagement. This overload protection process is a purely mechanical motion process, without any parts being damaged or permanently deformed. After the fault is cleared, it is only necessary to manually push the telescopic safety pin back to its original position so that the trapezoidal locking block can re-engage into the through groove, thus achieving instantaneous reset. This greatly reduces maintenance costs, significantly shortens downtime, and improves equipment availability. The disengagement torque threshold is mainly determined by the elastic coefficient and preload of the limit spring 11. The spring has stable performance and is easy to control precisely through design and adjustment. Compared with safety pins that rely on material failure limits, its protection value has higher consistency and reliability. In contrast, the safety pin in the patent is a rigid connector, and at the moment of overload, the torque transmission is linear and unbuffered. When the safety pin reaches its shear limit and breaks, power transmission abruptly stops. This "hard cut-off" method generates a huge rigid impact and reverse torque on the driving end (such as the motor) and the driven end (such as gears and bearings). Over time, this may accelerate fatigue damage to related components. The utility model innovatively designs a "sequential disengagement elastic buffer" structure. Multiple elastic buffer pads 13 are set on the first positioning ramp 12 and the second positioning ramp 20. During the overload disengagement process, these elastic buffer pads 13 do not disengage from the limiting ramp 8 simultaneously. As the torque continues to increase, multiple elastic buffer pads 13 will disengage from the limiting ramp 8 sequentially, one by one, according to the magnitude of the force. The disengagement and compression process of each elastic buffer pad is a tiny energy absorption and release stage. This mechanism decomposes the one-time, violent impact energy into a series of continuous, gradual buffering processes, effectively absorbing and dissipating the overload impact.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A safety pin for a safety coupling, comprising a coupling (1), characterized in that: The coupling (1) has a first clamp (2) and a second clamp (3) connected to its outer walls at both ends. The first clamp (2) has a first through groove (6) at its top. A limiting inclined plate (8) is connected to one end of the first clamp (2) near the first through groove (6). A connecting plate (10) is connected to one end of the first clamp (2) near the limiting inclined plate (8). A first telescopic safety pin (14) is connected to one end of the connecting plate (10) near the limiting inclined plate (8). (14) has a first connecting spring (15) connected to its outer wall. The first telescopic safety pin (14) is connected to a first trapezoidal snap block (9) at one end away from the connecting plate (10). The top of the first trapezoidal snap block (9) is connected to a first positioning inclined plate (12). Both the first trapezoidal snap block (9) and the first positioning inclined plate (12) are connected to a plurality of elastic buffer pads (13). The end of the connecting plate (10) away from the first telescopic safety pin (14) is connected to a limit spring (11).

2. A safety pin for a safety coupling according to claim 1, characterized in that: The second clamp (3) has a second through groove (7) at one end of its top. The end of the second clamp (3) near the second through groove (7) is connected to a limiting inclined plate (8). The end of the second clamp (3) near the limiting inclined plate (8) is connected to a second telescopic safety pin (17). The outer wall of the second telescopic safety pin (17) is connected to a second connecting spring (18). The end of the second telescopic safety pin (17) away from the limiting spring (11) is connected to a second trapezoidal snap block (19). The top of the second trapezoidal snap block (19) is connected to a second positioning inclined plate (20). One side of the second trapezoidal snap block (19) and the second positioning inclined plate (20) is connected to multiple elastic buffer pads (13). The outer wall of the first telescopic safety pin (14) and the second telescopic safety pin (17) near the first clamp (2) and the second clamp (3) is fitted with a limiting sleeve (16).

3. A safety pin for a safety coupling according to claim 1, characterized in that: One end of the first clamp (2) and the second clamp (3) are threadedly fixed to a locking rod (4), and the top of the locking rod (4) is threadedly connected to a limit block (5). The first clamp (2) and the second clamp (3) are both sleeved on the two ends of the outer wall of the coupling (1).

4. A safety pin for a safety coupling according to claim 1, characterized in that: The first clamp (2) and the second clamp (3) are both fixedly connected to the limiting inclined plate (8), and the first clamp (2) and the second clamp (3) are both fixedly connected to the connecting plate (10). The connecting plate (10) is fixedly connected to the limiting spring (11).

5. A safety pin for a safety coupling according to claim 1, characterized in that: The connecting plate (10) is rotatably connected to the first telescopic safety pin (14), the first telescopic safety pin (14) is fixedly connected to the first connecting spring (15), and the first telescopic safety pin (14) is rotatably connected to the first trapezoidal snap-fit ​​block (9).

6. A safety pin for a safety coupling according to claim 1, characterized in that: The first trapezoidal snap-fit ​​block (9) is fixedly connected to the first positioning inclined plate (12). The first trapezoidal snap-fit ​​block (9) and the first positioning inclined plate (12) are both fixedly connected to the multiple elastic buffer pads (13). The elastic buffer pads (13) are in contact with one end of the limiting inclined plate (8).

7. A safety pin for a safety coupling according to claim 2, characterized in that: The second telescopic safety pin (17) is rotatably connected to the second trapezoidal snap-fit ​​block (19), the second telescopic safety pin (17) is fixedly connected to the second connecting spring (18), the second trapezoidal snap-fit ​​block (19) is fixedly connected to the second positioning inclined plate (20), and the limiting cylinder (16) is fixedly sleeved on one end of the outer wall of the first telescopic safety pin (14) and the second telescopic safety pin (17).

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