Split type elastic pin tooth type coupler

Abstract

The utility model discloses a split type elastic pin tooth type coupler which comprises a half coupling seat A. One side of the half coupling seat A is connected with a half coupling seat B through an elastic pin, and the half coupling seat B and the half coupling seat A are the same in structure. And an outer groove for mounting the elastic pin between the half coupling seat A and the half coupling seat B is formed in the corresponding surface side between the half coupling seat A and the half coupling seat B. The elastic pin is effectively mounted between the half coupling seat A and the half coupling seat B through the unique structural design. The split connecting shaft and the semi-coupling seat are in tooth type limiting connection through the combined tooth block and the combined tooth groove, and the split connecting shaft is firmly fixed on an outer boss of the semi-coupling seat in cooperation with double locking of the arc combined lock plate with the inner face and the outer face provided with threads, the outer fixing lock ring and the inner fixing lock ring. When the coupling rotates at a high speed and bears large torque, loosening and meshing dislocation of the connecting shaft can be effectively prevented, smooth torque transmission is ensured, energy loss and equipment faults are avoided, and the connecting stability and reliability of the coupling are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coupling, specifically relates to a split type elastic pin tooth coupling. BACKGROUND

[0002] The national standard GB / T 5015-2017 discloses the main content of the structure type and basic size of the elastic pin tooth coupling, the coupling can compensate the relative offset of two shafts, has poor damping function, low transmission accuracy, large torque transmission, simple structure, light weight, convenient manufacturing and maintenance compared with the tooth coupling, does not need lubrication, partially replaces the tooth coupling, has large noise, is suitable for large and medium torque shaft transmission, the blank of the series coupling must be checked according to the standard stipulated in GB / T 699, and the material utilization rate is low during the blank organization; meanwhile, the main wear part of the elastic pin tooth coupling is the tooth part, especially the large-specification elastic pin tooth coupling model, when the tooth part is worn only, the complete set must be replaced, and the replacement cost and difficulty are very large.

[0003] Therefore, the split type elastic pin tooth coupling with the publication number "CN216111821U" is disclosed. It comprises a left coupling assembly, a right coupling assembly and a mounting sleeve, the left coupling assembly comprises a left shaft body with a flange and a left connecting shaft installed in cooperation with the left shaft body through the end face teeth engaged with each other, the right coupling assembly comprises a right shaft body with a flange and a right connecting shaft matched with the right shaft body through the end face teeth engaged with each other, the mounting sleeve is installed on the outer circumferential surface of the flange of the left shaft body and the right shaft body, and the elastic pins are arranged between the outer circumferential surface of the flange of the left shaft body and the mounting sleeve and between the outer circumferential surface of the flange of the right shaft body and the mounting sleeve respectively. The advantages are that the radial runout can meet the 7th level stipulated in GB / T1184, the split type structure can improve the material utilization rate to more than 80%, greatly reduces the manufacturing cost, the standardized accessories can be replaced at any time according to the needs, and the installation and replacement convenience is improved.

[0004] However, for the above-mentioned split type elastic pin tooth coupling, although the coupling assembly is composed of the shaft body with the flange and the connecting shaft matched with the shaft body through the end face teeth engaged with each other, the reliable integration is formed by utilizing the centering feature of the end face teeth engagement, and the following relatively obvious defects still exist in the use process: the connecting shaft of the above-mentioned coupling is composed of the end face teeth engaged with each other and the shaft body, and the end face teeth on the connecting shaft and the connecting assembly are triangular inclined teeth, since the coupling will generate a large torque force on the connecting shaft in the high-speed rotating shaft, the end face teeth engaged with each other will be misaligned due to the large torque of the inclined teeth, leading to the problem of loose connecting shaft. UTILITY MODEL CONTENTS

[0005] The utility model discloses a split type elastic pin tooth type coupling to solve the problems in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical scheme: a split type elastic pin tooth type coupling, comprising:

[0007] Half coupling seat A one side is connected with half coupling seat B that same structure is with half coupling seat A through elastic pin, half coupling seat A and half coupling seat B's outside surface is equipped with the coupling limit gland that carries out the disassembly locking of split type elastic pin tooth type coupling, and half coupling seat A and half coupling seat B between the corresponding face side is equipped with the outer groove of making elastic pin install between half coupling seat A and half coupling seat B;

[0008] Half coupling seat A and half coupling seat B outer surface all combination connection has split type connecting shaft, and the inner ring on one side of split type connecting shaft is evenly equipped with the combination tooth block that is limited with half coupling seat A and half coupling seat B one side boss tooth type connection, combination tooth block corresponds half coupling seat A and half coupling seat B outside boss one side is equipped with the combination tooth groove that is inserted with combination tooth block tooth type combination.

[0009] Preferably, the split type connecting shaft and the half coupling seat A and half coupling seat B connecting one side of the edge are uniformly provided with an inner and outer surface threaded arc combination lock plate. The inner and outer surface threaded arc combination lock plate, on the one hand, utilizes its special arc shape to better fit the outer surface of the half coupling seat and disperse stress; on the other hand, the inner and outer threads provide double fastening protection, greatly enhancing the stability of the connection.

[0010] Preferably, the half coupling seat A and half coupling seat B outside boss surface corresponding to the position of the arc combination lock plate is provided with an arc limiting through slot that allows the arc combination lock plate to pass through to the other side of the half coupling seat A and half coupling seat B, ensuring that the lock plate can accurately and accurately pass through the half coupling seat to the predetermined position. At the same time, the limiting through slot also plays a certain positioning role, so that the lock plate does not deviate during installation, ensuring the precision and stability of the entire connection structure.

[0011] Preferably, the half coupling seat A and half coupling seat B corresponding face inner ring is provided with a combination lock cavity of a circular ring type, and the arc combination lock plate passes through the arc limiting through slot to the combination lock cavity, which can match the shape of the arc combination lock plate, better disperse the force borne by the lock plate, and further enhance the reliability of the connection.

[0012] Preferably, the circular arc combination lock plate is locked by the outer fixed lock ring after passing through the circular arc limiting through groove, and the circular arc combination lock plate is locked by the inner fixed lock ring, so that the lock plate will not be deformed or displaced when being stressed. The double locking mode of the inner and outer fixed lock rings is like double insurance for the connecting structure, and even under extreme working conditions, the tight connection of the split connecting shaft and the half shaft seat can be ensured.

[0013] Preferably, the split connecting shaft connected to the half shaft seat A and the half shaft seat B is locked in the combination lock cavity by the circular arc combination lock plate through the inner and outer fixed lock rings, so that the split connecting shaft is fixed on the boss outside the half shaft seat A and the half shaft seat B, and the torque transmission between the split connecting shaft and the half shaft seat is smoother, and energy loss and equipment failure caused by loose connection are effectively avoided.

[0014] Preferably, the half shaft seat A and the half shaft seat B are uniformly provided with through grooves on the outer surfaces, and the through grooves are provided with threaded pin rods penetrating through the elastic column pins, and the threaded pin rods are combined and locked by penetrating out of the shaft coupling limiting gland, so that the elastic column pins are firmly fixed on the half shaft seat, and the half shaft seat A and the half shaft seat B are further locked.

[0015] Preferably, the elastic column pins are equidistantly fixed in the outer grooves of the corresponding surfaces of the half shaft seat A and the half shaft seat B, and the shaft coupling limiting gland is pressed on the outside of the boss outside the half shaft seat A and the half shaft seat B through the threaded pin rods, so as to ensure the balance and stability of the shaft coupling when transmitting torque. The function of the shaft coupling limiting gland is to limit and protect the entire shaft coupling, so as to prevent axial displacement or other abnormal conditions during work.

[0016] Compared with the prior art, the technical effects and advantages of the split type elastic column pin tooth type shaft coupling are that,

[0017] The split connecting shaft and the half shaft seat are connected and limited by the combined tooth block and the combined tooth groove, and the double locking of the circular arc combination lock plate with threads on the inner and outer surfaces and the outer fixed lock ring and the inner fixed lock ring is matched, so that the split connecting shaft is firmly fixed on the boss outside the half shaft seat. When rotating at high speed and bearing large torque, the connecting shaft can be effectively prevented from loosening and engaging misplacement, the torque transmission is smooth, energy loss and equipment failure are avoided, and the connection stability and reliability of the shaft coupling are greatly improved.

[0018] This invention excels in installation and maintenance. Standardized accessories can be readily replaced as needed without requiring repeated calibration, significantly improving ease of installation and replacement. Half-coupling A and half-coupling B are connected by elastic pins. Through grooves and threaded pins on the outer surface facilitate the installation and fixation of the elastic pins. The threaded pins cooperate with the coupling's limiting gland, not only securing the elastic pins but also further tightening the half-couplings. The overall structure is rationally designed, facilitating daily installation, disassembly, and maintenance.

[0019] This invention features an outer groove on the corresponding surfaces of half-coupling A and half-coupling B, with an elastic pin installed inside the outer groove via a threaded pin. The elastic pin is positioned at the center of the outer groove surface. This design prevents the elastic pin from contacting half-coupling A and half-coupling B during high-speed rotation, thus avoiding friction and high-temperature deformation. Simultaneously, the elastic pin self-cools during operation, thereby extending its service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the split-type combined structure of the coupling of this utility model;

[0021] Figure 2 This is a side view of the split connecting shaft structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the left side of the structure of the half-coupling seat A of this utility model;

[0023] Figure 4 This is a schematic diagram of the right side of the structure of the half-coupling seat A of this utility model;

[0024] Figure 5 This is a side view of the combined structure of the half-coupling seat A and the arc-shaped combination locking plate of this utility model;

[0025] Figure 6 This is a schematic diagram of the combined locking structure of the arc-shaped combination locking plate, the arc-shaped limiting through groove, and the external fixing locking ring of this utility model.

[0026] In the diagram: 1. Half-coupling seat A; 2. Elastic pin; 3. Half-coupling seat B; 4. Coupling limiting cover; 5. Outer groove; 6. Combined gear block; 7. Combined gear groove; 8. Arc-shaped combined locking plate; 9. Arc-shaped limiting through groove; 10. Combined locking cavity; 11. Outer fixed locking ring; 12. Inner fixed locking ring; 13. Through groove; 14. Threaded pin; 15. Split connecting shaft. Detailed Implementation

[0027] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of the utility model protection.

[0028] Please refer to Figures 1-6 The utility model provides a technical scheme: a split type elastic pin gear coupling, comprising:

[0029] Half coupling seat A1 one side is connected with half coupling seat B3 same structure with half coupling seat A1 through elastic pin 2, half coupling seat A1 and half coupling seat B3 are connected with the shaft on both sides respectively, play the key role of transmission torque and rotary motion. Same structure, connect through elastic pin 2, constitute the main framework of coupling, provide the support platform for the installation and collaborative work of other components. Meanwhile, the corresponding face side outside groove 5 of them provides the accurate position for the installation of elastic pin 2, guarantees the stability of elastic pin when transmitting torque. Elastic pin 2 is installed in the outside groove 5 of the corresponding face of half coupling seat A1 and half coupling seat B3, play the role of buffering and damping. In the process of transmission torque of coupling, because there can be certain relative deviation and vibration between two shafts, elastic pin 2 can absorb and alleviate these impacts through the elastic deformation of itself, reduce the vibration and noise of equipment, thereby protect other components of equipment, prolong the service life of equipment.

[0030] The outside of half coupling seat A1 and half coupling seat B3 is equipped with coupling limiting gland 4 that disassembles and locks split type elastic pin gear coupling, and it is connected with half coupling seat A1 and half coupling seat B3 through threaded pin rod 14. When installing, by tightening threaded pin rod 14, coupling limiting gland 4 is tightly pressed on the outside of the external boss of half coupling seat A1 and half coupling seat B3, thereby fastening the overall structure of coupling, preventing the loosening of each component during operation. When disassembling, loosen threaded pin rod 14, coupling limiting gland 4 can be conveniently removed, and then the internal components can be repaired or replaced.

[0031] And the corresponding face side between half coupling seat A1 and half coupling seat B3 is equipped with the outside groove 5 that makes elastic pin install between half coupling seat A1 and half coupling seat B3, and the outside groove 5 is arranged on the corresponding face side between half coupling seat A1 and half coupling seat B3, and its accurate position and shape design are to adapt the installation of elastic pin 2. It provides reliable positioning for elastic pin, ensures that elastic pin does not displace during operation, and ensures the stability and accuracy of coupling torque transmission;

[0032] The outer surface of the half shaft seat A1 and the half shaft seat B3 are combined with the split connecting shaft 15, and the split connecting shaft 15 is combined with the outer surface of the half shaft seat A1 and the half shaft seat B3, which is a key component for transmitting torque from the half shaft seat to the external shaft. The combination tooth block 6 evenly arranged on one side of the inner circle of the split connecting shaft 15 is connected with the combination tooth groove 7 of the one side protrusion of the half shaft seat A1 and the half shaft seat B3, which not only increases the reliability of the connection, but also ensures that the torque can be transmitted stably and efficiently when rotating at high speed and bearing large torque, effectively avoiding energy loss and equipment failure caused by loose connection.

[0033] The inner circle of one side of the split connecting shaft 15 is evenly provided with a combination tooth block 6 for tooth type limiting connection with the one side protrusion of the half shaft seat A1 and the half shaft seat B3, and the combination tooth block 6 is provided with a combination tooth groove 7 corresponding to the one side protrusion of the half shaft seat A1 and the half shaft seat B3, which is tooth type plug-in combination with the combination tooth block 6. The combination tooth block 6 and the combination tooth groove 7 cooperate with each other to form a tooth type plug-in combination. This design takes advantage of the high bearing capacity and precise positioning characteristics of the tooth shape structure, which can tightly connect the split connecting shaft 15 with the half shaft seat A1 and the half shaft seat B3 when transmitting torque, and realize reliable torque transmission. At the same time, the tooth type limiting connection can effectively prevent the relative rotation of the split connecting shaft in the circumferential direction, ensuring the accuracy and stability of the transmission.

[0034] The side of the split connecting shaft 15 connected with the half shaft seat A1 and the half shaft seat B3 is evenly provided with an arc combination lock plate 8 with threads on the inner and outer surfaces, which is installed on the side of the split connecting shaft 15 connected with the half shaft seat A1 and the half shaft seat B3. The unique design of the threads on the inner and outer surfaces provides a basis for subsequent locking operation. Through the cooperation of the outer fixed lock ring 11 and the inner fixed lock ring 12, the arc combination lock plate 8 can fasten the split connecting shaft 15 from multiple angles, so that it can still be tightly combined with the half shaft seat when rotating at high speed and bearing large torque, effectively preventing the problem of loose connection caused by excessive torque.

[0035] The outer protrusion surface of the half shaft seat A1 and the half shaft seat B3 corresponding to the position of the arc combination lock plate 8 is provided with an arc limiting through slot 9, through which the arc combination lock plate 8 passes to the other side of the half shaft seat A1 and the half shaft seat B3. The arc limiting through slot 9 is provided on the outer protrusion surface of the half shaft seat A1 and the half shaft seat B3 corresponding to the position of the arc combination lock plate 8, which provides a precise installation path for the arc combination lock plate 8. During installation, it is ensured that the arc combination lock plate 8 can accurately pass through the half shaft seat and reach the predetermined combination lock cavity 10. At the same time, the arc limiting through slot 9 also plays a positioning role, so that the lock plate will not deviate during installation and operation.

[0036] The inner ring of the corresponding surface of the half-coupling seat A1 and the half-coupling seat B3 is provided with a combined lock cavity 10 in the form of a circular ring, and the circular arc combined lock plate 8 passes through the circular arc limiting through slot 9 into the combined lock cavity 10. The combined lock cavity 10 is located in the inner ring of the corresponding surface of the half-coupling seat A1 and the half-coupling seat B3, and is in the form of a circular ring. The design purpose is to accommodate the circular arc combined lock plate 8 passing through the circular arc limiting through slot 9 to form a complete locking space. The circular ring structure matches the shape of the circular arc combined lock plate 8, can better disperse the force borne by the lock plate, further enhances the reliability of the connection between the split connecting shaft 15 and the half-coupling seat, and can effectively avoid structural damage caused by excessive local stress in actual application.

[0037] After the circular arc combined lock plate 8 passes through the circular arc limiting through slot 9, the outer fixed lock ring 11 is threadedly locked outside the circular arc combined lock plate 8, and the inner fixed lock ring 12 is threadedly locked inside the circular arc combined lock plate 8 to support and lock the inner side of the circular arc combined lock plate 8. The outer fixed lock ring 11 fastens the circular arc combined lock plate 8 passing through the circular arc limiting through slot 9 from the outside to prevent it from loosening outwardly; the inner fixed lock ring 12 supports and locks the circular arc combined lock plate 8 from the inside to ensure that the lock plate will not deform or displace when stressed. The double locking design of the two lock rings greatly improves the connection strength between the split connecting shaft 15 and the half-coupling seat, like double insurance for the connection structure, which can ensure the close connection of the two even under extreme working conditions.

[0038] The split connecting shaft 15 connected outside the half-coupling seat A1 and the half-coupling seat B3 is locked in the combined lock cavity 10 by the circular arc combined lock plate 8 through the inner and outer fixed lock rings, so that the split connecting shaft 15 is fixed on the boss outside the half-coupling seat A1 and the half-coupling seat B3 in the form of a tooth.

[0039] The outer surface side of the half shaft seat A1 and the half shaft seat B3 is uniformly provided with a through groove 13, which is uniformly distributed on the outer surface side of the half shaft seat A1 and the half shaft seat B3, and its function is to provide installation space for the threaded pin rod 14. The design of the through groove facilitates the installation and removal of the threaded pin rod 14, making the fixing of the elastic pin 2 and the further locking operation of the half shaft seat A1 and the half shaft seat B3 more convenient, and the threaded pin rod 14 passing through the elastic pin 2 is provided in the through groove 13, and the threaded pin rod 14 passes out at both ends to the shaft coupling limiting gland 4 for combined locking and fixing, the elastic pin 2 is fixed equidistantly in the outer groove 5 on the corresponding surface of the half shaft seat A1 and the half shaft seat B3, and the shaft coupling limiting gland 4 is pressed on the outside of the external boss of the half shaft seat A1 and the half shaft seat B3 through the threaded pin rod 14. The threaded pin rod 14 passes through the through groove 13 and the elastic pin 2, and the two ends pass out to the shaft coupling limiting gland 4 for combined locking and fixing. The threaded pin rod 14 not only can firmly fix the elastic pin 2 on the half shaft seat, but also can realize the further locking of the half shaft seat A1 and the half shaft seat B3 by cooperating with the shaft coupling limiting gland 4, effectively prevent the loosening and falling of the elastic pin 2 during the operation of the equipment, and ensure the normal work of the shaft coupling.

[0040] Specifically, in use, the half shaft seat A1 and the half shaft seat B3 are connected with the shafts on both sides to form the main frame of the shaft coupling. The two are connected by the elastic pin 2, which plays a role of buffering and damping when transmitting torque, compensates for the possible relative deviation and vibration of the two shafts, and ensures stable transmission of torque. For example, in the connection scene of motor and speed reducer, when the motor shaft and the speed reducer shaft have slight deviation in speed or position, the elastic pin 2 can absorb the impact, reduce the vibration and noise of the equipment, protect the equipment parts, and the split connecting shaft 15 connected to the outer surface of the half shaft seat A1 and the half shaft seat B3 is the key to transmit torque to the external shaft. The combined tooth block 6 in the inner circle of the split connecting shaft 15 is connected with the combined tooth groove 7 of the half shaft seat boss in a tooth type limiting manner, which ensures stable and efficient transmission of torque when rotating at high speed and bearing large torque, avoids energy loss and equipment failure caused by loose connection, and ensures stable power transmission in large transmission equipment in industrial production line. At the same time, the split connecting shaft 15 is locked in the combined lock cavity 10 by the arc combined lock plate 8 with threads on the inner and outer surfaces, the outer fixed lock ring 11 and the inner fixed lock ring 12, realizing firm fixing in axial and radial directions and enhancing the reliability of connection;

[0041] The through slot 13 on the outer surface side of the half-coupling seat A1 and the half-coupling seat B3 facilitates the installation of the threaded pin 14, the threaded pin 14 passes through the elastic pin 2 and is locked in combination with the coupling limiting gland 4. When installing, the threaded pin 14 is tightened, the coupling limiting gland 4 is tightly pressed on the outside of the half-coupling seat external boss, the overall structure of the coupling is fastened, and the parts are prevented from loosening; when disassembling, the threaded pin 14 is loosened, the limiting gland 4 is easily removed, and the internal parts are maintained or replaced. In addition, the elastic pin 2 is fixed equidistantly in the outer groove 5 on the corresponding surface of the half-coupling seat, the balance and stability of the coupling when transmitting torque are ensured, the coupling limiting gland 4 also plays a limiting and protecting role, and the axial displacement or other abnormal conditions during work are prevented.

[0042] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.

Claims

1. A split elastic pin gear coupling, characterized by, Include: Half coupling seat A (1), one side of the half coupling seat A (1) is connected with the half coupling seat B (3) which has the same structure with the half coupling seat A (1) through elastic pin (2), the outer side of the half coupling seat A (1) and the half coupling seat B (3) is provided with coupling limiter cover (4) for disassembling and locking split type elastic pin tooth coupling, and the corresponding face side between the half coupling seat A (1) and the half coupling seat B (3) is provided with outer groove (5) for installing elastic pin between the half coupling seat A (1) and the half coupling seat B (3); The outer surface of the half coupling seat A (1) and the half coupling seat B (3) is combined with split connecting shaft (15), and the inner circle of one side of the split connecting shaft (15) is uniformly provided with combined tooth block (6) for limiting and connecting with the boss tooth type of one side of the half coupling seat A (1) and the half coupling seat B (3), the combined tooth block (6) is provided with combined tooth groove (7) combined with the combined tooth block (6) tooth type on one side of the external boss of the half coupling seat A (1) and the half coupling seat B (3).

2. The split resilient pin-and-tooth coupling as set forth in claim 1, wherein: The side of one side of the split connecting shaft (15) and the half coupling seat A (1) and the half coupling seat B (3) is uniformly provided with arc combined lock plate (8) with threads on the inner and outer surfaces.

3. The split resilient pin-and-tooth coupling as set forth in claim 2, wherein: The external boss surface of the half coupling seat A (1) and the half coupling seat B (3) is provided with arc limiting through groove (9) corresponding to the position of the arc combined lock plate (8), which is penetrated to the other side of the half coupling seat A (1) and the half coupling seat B (3).

4. The split resilient pin-and-tooth coupling as set forth in claim 3, wherein: The inner circle of the corresponding face of the half coupling seat A (1) and the half coupling seat B (3) is provided with combined lock cavity (10) of circular ring type, and the arc combined lock plate (8) passes through the arc limiting through groove (9) to the combined lock cavity (10).

5. The split resilient pin-and-tooth coupling as set forth in claim 4, wherein: The outer thread of the arc combined lock plate (8) is locked with the outer fixed lock ring (11) after passing through the arc limiting through groove (9), and the inner thread of the arc combined lock plate (8) is locked with the inner fixed lock ring (12) for supporting and locking the inner side of the arc combined lock plate (8).

6. The split resilient pin-and-tooth coupling as set forth in claim 5, wherein: The split connecting shaft (15) connected outside the half coupling seat A (1) and the half coupling seat B (3) is locked in the combined lock cavity (10) by the arc combined lock plate (8) and the inner and outer fixed lock rings, so that the split connecting shaft (15) is fixed on the boss outside the half coupling seat A (1) and the half coupling seat B (3).

7. The split resilient pin-and-tooth coupling as set forth in claim 5, wherein: The outer surface side of the half coupling seat A (1) and the half coupling seat B (3) is uniformly provided with through groove (13), and the through groove (13) is provided with threaded pin rod (14) passing through the elastic pin (2), and the threaded pin rod (14) passes out to the coupling limiter cover (4) for combined locking and fixing.

8. The split resilient pin-and-tooth coupling as set forth in claim 7, wherein: The elastic pin (2) is fixed equidistantly in the outer groove (5) of the corresponding face of the half coupling seat A (1) and the half coupling seat B (3), and the coupling limiter cover (4) is pressed to the outside of the external boss of the half coupling seat A (1) and the half coupling seat B (3) through the threaded pin rod (14).

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