Release lock for ground impact test

Abstract

The invention discloses a release lock for a ground impact test. The release lock comprises a clamping plate, a lock bolt mechanism (1), a three-stage lever assembly, a connecting ring body and an unlocking device. According to the invention, connection of the release lock and release of large-tonnage air-drop equipment are realized mainly through a three-level lever principle and limiting and releasing of the lock bolt, and equipment support is provided for connection and rapid separation of the air-drop equipment and a hoisting device in a test process.

Description

Technical Field

[0001] The invention belongs to the application field of ground impact test of airdrop equipment, and specifically, is a release lock used for ground impact test. Background Art

[0002] At present, most of the airdrop equipment has the requirement of "ground test first, then air test". According to the operating process of the ground impact test, it is required that the airdrop equipment and the lifting device remain connected during lifting. When the airdrop equipment reaches the predetermined position, it can be quickly separated from the lifting device. At the same time, it is necessary to ensure that the airdrop equipment maintains a horizontal posture during the free fall process.

[0003] The breakaway lock used in the current domestic airdrop system can realize the connection and separation between ten-ton airdrop systems. The breakaway lock mainly includes a main parachute connector and a lock body. The main parachute connector is connected to the main parachute system, and the lock body is connected to the cargo platform system. When the limit device in the lock body is released and the relative position of the main parachute connector and the lock body is deflected, the main parachute connector and the lock body can be separated, releasing the connection between the main parachute system and the cargo platform system.

[0004] The ground impact test of large-tonnage airdrop systems requires a disengagement lock that can be easily and reliably remotely manually disengaged on the ground. The existing disengagement locks cannot meet the requirements in terms of both strength and working mode. The lifting of a 20-ton airdrop system must reach a rated load of 80 tons, taking into account imbalance and safety factors. For existing disengagement locks that meet this strength, two steps are required to achieve the separation action. One is to release the limit device in the lock body, and the other is to cause the relative position of the main parachute connector and the lock body to deflect. Both of these steps are triggered at the moment the cargo platform lands during the actual airdrop process and cannot be triggered manually on the ground. In addition, for disengagement locks that can be manually triggered on the ground, their rated strength is far less than the requirements for large-tonnage cargo platforms and cannot meet usage needs.

[0005] For the disengagement lock, "large tonnage" and "reliable manual remote release on the ground" are contradictory, and the existing disengagement lock cannot take into account both aspects at the same time. Summary of the invention

[0006] The purpose of the present invention is to provide a release lock for ground impact test, which is mainly used in ground impact test of airdrop equipment to realize the connection and separation of the airdrop equipment with the lifting device during the test.

[0007] The technical solution to achieve the purpose of the present invention is: a release lock for ground impact test, comprising five parts: a clamping plate, a locking bolt mechanism, a three-stage lever assembly, a connecting ring body and an unlocking device;

[0008] The clamping plate serves as a mounting base and load-bearing component for other components of the release lock; the locking bolt mechanism is assembled between the clamping plates and is located on the upper edge of the long side of the clamping plates;

[0009] The three-stage lever assembly is assembled between the clamping plates and is located in the middle and lower part of the clamping plates. The side lever in the three-stage lever assembly contacts the locking bolt in the locking bolt mechanism and is limited by the locking bolt.

[0010] The connecting ring body is divided into an upper connecting ring body and a lower connecting ring body. The upper connecting ring body is assembled on the top of the clamping plate, and the lower connecting ring body is located at the bottom of the clamping plate and connected to the hook head of the main lever in the three-stage lever assembly. The upper connecting ring body connects the clamping plate with the lifting device, and the lower connecting ring body connects the hook head of the main lever with the test object.

[0011] The unlocking device includes a steering pulley and an unlocking steel rope. The steering pulley is separately connected to the lifting device and is located above the splint. The unlocking steel rope is connected to the lock bolt. The direction of the unlocking force is adjusted by the steering pulley. When unlocking and releasing is required, the unlocking steel rope is pulled to open the lock bolt. After the side lever limit is released, the hook head of the main lever releases the lower connecting ring through the linkage relationship of the three-stage lever assembly.

[0012] Furthermore, the splint comprises an upper splint and a lower splint, the upper splint and the lower splint are two rectangular plates with a certain thickness, the upper splint and the lower splint are placed opposite to each other with a certain distance in between, a concave open square groove is formed on the short side of one side of the upper splint and the lower splint, and a square hole is formed after the square groove cooperates with the hook head of the main lever, which can cooperate with the ring body bolt of the lower connecting ring body; a circular through hole is formed at the other short side of the upper splint, the lower splint and the concave open square groove, and the size of the circular through hole matches the diameter of the ring body bolt of the upper connecting ring body for assembling the upper connecting ring body; the upper splint and the lower splint are opened at the opening Three groups of through holes are opened on the side, top and bottom of the square groove, which are used to assemble the three-stage lever assembly. The size of the hole matches the outer diameter of the corresponding lever bolt; the upper splint and the lower splint have a group of small through holes at the same position for assembly with the locating pin, and the position arrangement between the bolt holes of the three-stage lever assembly and the small through holes is approximately in a "Z" shape; there is also a long square and circular groove hole on the other side opposite to the small through hole, which matches the bosses on both sides of the lock bolt in the lock bolt mechanism, and the lock bolt bosses can slide back and forth in the groove; the upper splint has a threaded hole on the upper side of the square and circular groove hole for assembling the limiting screw sleeve in the lock bolt mechanism.

[0013] Furthermore, the locking bolt mechanism comprises a connecting bolt, a limiting screw sleeve, a limiting pin, a limiting spring, a guide column, a locking bolt spring and a locking bolt; one end of the locking bolt has two ear pieces, one ear piece is provided with a through hole, and the other ear piece is provided with a threaded hole, and the connecting bolt passes through the through hole and the unlocking steel rope and is fastened through the threaded hole; the middle part of the locking bolt has a long square slot hole structure, the guide column can slide freely in the square slot, and the inner plane at the lower end of the square slot is provided with a raised step to guide and limit the locking bolt spring; two bosses extend from the side of the other end of the locking bolt, and the bosses can slide in the square and round slot holes of the upper clamping plate and the lower clamping plate, and when in the locked position, the end of the locking bolt has a limiting effect on the end of the side lever;

[0014] The limiting screw sleeve is a shell structure, with a threaded structure on the outside of the open end, which is threadedly connected to the corresponding hole of the upper clamping plate. A small hole is opened at the bottom of the shell to mount the limiting pin; a circle of steps is provided on the outside of the bottom of the limiting screw sleeve to play an axial limiting role.

[0015] Furthermore, the limit pin is a three-section stepped rod-shaped part, which can slide freely in the limit screw sleeve; the limit spring is a compression spring, which is installed between the limit screw sleeve and the limit pin to play a role in resetting the limit pin.

[0016] Furthermore, the guide column is a square rod with cylindrical rods at both ends connected to the upper clamping plate and the lower clamping plate; a square boss is provided on one side surface of the square rod to guide and limit the lock bolt spring; the lock bolt spring is a compression spring located between the guide column and the bottom of the lock bolt square groove.

[0017] Further, the three-stage lever assembly includes a side lever, a middle lever, a main lever, a side bolt shaft, a middle bolt shaft and a main bolt shaft; the side lever is a bean sprout-shaped lever with a through hole at its head; the middle lever is a teardrop-shaped lever with a through hole at the large end; the main lever is a hook-shaped lever with a 90-degree flat hook at the head and a through hole in the middle of the hook handle; the side bolt shaft is a three-section stepped rod-shaped part with threads at both ends; the middle bolt shaft is a five-section stepped rod-shaped part with threads at both ends; the main bolt shaft is a five-section stepped rod-shaped part with threads at both ends;

[0018] The upper and lower plates are positioned by the shoulders on both sides of the side bolt axis, the middle bolt axis and the main bolt axis to form a cavity. The side bolt axis is located on one side of the bottom of the upper and lower plates, the middle bolt axis is located in the middle and upper part of the upper and lower plates, and the main bolt axis is located on the other side of the bottom of the upper and lower plates; the side bolt axis, the middle bolt axis and the main bolt axis pass through the through holes of the side lever, the middle lever and the main lever, and the three-stage lever is installed in a vertical "Z" shape at a fixed position in the cavity; the inner side of the end of the side lever contacts the end of the locking bolt, the end of the middle lever contacts the outer side of the head of the side lever, the end of the hook handle of the main lever contacts one side of the large end of the middle lever, and the hook head is connected to the lower connecting ring body to form a three-stage lever force transmission structure, and the three-stage lever can flexibly rotate around its own bolt axis according to a fixed trajectory in the cavity.

[0019] Furthermore, the positioning pin is a three-section stepped shaft, which is located between the upper clamping plate and the lower clamping plate and is close to the end of the hook handle of the main lever.

[0020] Furthermore, the connecting ring body includes a ring body, a ring body bolt and a nut; the ring body is a U-shaped ring, and a through hole is opened at the U-shaped opening for assembling the ring body bolt and the nut; the upper connecting ring body is connected to the upper clamping plate and the lower clamping plate through the ring body bolt, and the lower connecting ring body is placed in the flat hook of the main lever; the U-shaped part of the upper connecting ring body is connected to the upper sling, and the U-shaped part of the lower connecting ring body is connected to the lower sling.

[0021] Furthermore, the steering pulley comprises a pulley, a pulley bracket, and a pin shaft; the pulley is a disk with a groove on the outer circumference and a through hole at the center of the circle; the pulley bracket is a cylindrical metal rod with hemispheres at both ends, a groove is opened at one end of the metal rod, and a large and a small circular hole are opened on one side of the groove. When assembling, the pulley is placed in the groove of the pulley bracket, and the pin shaft passes through the pulley bracket and the pulley hole at the same time from one end of the large hole, and then has an interference fit with the small hole of the pulley bracket. A hole is opened at the other end of the pulley bracket for passing a rope ring to hang the steering pulley in a suitable position; the unlocking steel rope is a thin steel rope, one end of which is tied to the locking bolt mechanism; after the unlocking steel rope passes through the groove of the steering pulley disk, it can be reversed; the other end of the unlocking steel rope is a pulling end.

[0022] Compared with the prior art, the present invention has the following significant advantages: (1) By designing a steering pulley assembly, a method of unlocking at any angle is realized. (2) By designing a lock bolt with a square groove, an assembly method of a spring built inside the lock bolt is realized. (3) By designing an assembly method of a built-in spring, the function of automatic resetting of the lock bolt is realized. (4) By designing an open shell structure with a hole at the bottom and an assembly method of a limit pin and a limit spring, the function of the limit pin automatically restoring the working position is realized. (5) By designing the matching relationship between the limit pin, the limit spring, the limit screw sleeve and the lock bolt, the function of the lock bolt mechanism maintaining the unlocked state after the lock bolt is unlocked is realized. (6) A three-stage lever assembly is designed, and the force is reduced by the lever principle, thereby reducing the pressure on the lock bolt, and realizing that the unlocking action can be completed with a small unlocking pulling force. (7) When in the locked state, the axial direction of the lever of the three-stage lever assembly is designed to be close to the direction of external force, thereby achieving the purpose of compact structure and reasonable force. (8) The arrangement of the lever rotation axis position and the positioning pin position of the three-stage lever group is designed to be "Z" shaped, thereby achieving the purpose of compact structure. (9) Through the lever principle, the motion trajectory of each lever is designed, so that the release lock can be used as a connecting device when in the locked state and as a releasing device when in the unlocked state. (10) Positioning holes are designed on the rectangular square plate, and the lever assembly is built-in through the assembly method of clamping the upper and lower clamping plates with the stepped shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the release lock.

[0024] Figure 2 It is a schematic diagram of the structure of the locking bolt mechanism.

[0025] Figure 3 is a schematic diagram of a diverter pulley assembly. DETAILED DESCRIPTION

[0026] The present invention designs a release mechanism suitable for large-tonnage ground impact tests, which can realize reliable manual remote release on the ground and provide equipment support for the connection and rapid separation of airdrop equipment from the lifting device during the test.

[0027] The present invention mainly realizes the release of the lock connection and the release of large-tonnage airdrop equipment through the three-stage lever principle and the limit and release of the lock bolt. The present invention can be used for the connection and release of two objects in different scenarios, such as the connection and separation of parachutes and objects in airdrop systems; and the connection, fixation and release in the cabin of an aircraft during air transportation of airdrop systems.

[0028] The present invention comprises five parts, namely, a clamping plate, a locking bolt mechanism 1, a three-stage lever assembly, a connecting ring body and an unlocking device.

[0029] The clamping plate serves as a mounting base and a load-bearing component for releasing other components of the lock; the locking bolt mechanism 1 is assembled between the clamping plates and is located at the upper edge of the long side of the clamping plate; the three-stage lever assembly is assembled between the clamping plates and is located in the middle and lower part of the clamping plate; the side lever 2 in the three-stage lever assembly contacts the locking bolt 15 in the locking bolt mechanism 1 and is limited by the locking bolt 15; the connecting ring body is divided into an upper connecting ring body 12 and a lower connecting ring body 7, the upper connecting ring body 12 is assembled on the top of the clamping plate, the lower connecting ring body 7 is located at the bottom of the clamping plate, and is connected to the hook head of the main lever 9 in the three-stage lever assembly, and the upper connecting ring body 12 is assembled on the top of the clamping plate, and the lower connecting ring body 7 is located at the bottom of the clamping plate and is connected to the hook head of the main lever 9 in the three-stage lever assembly. The ring body 12 connects the clamp plate with the lifting device, and the lower connecting ring body 7 connects the hook head of the main lever 9 with the test object; the unlocking device includes a steering pulley 13 and an unlocking steel rope 14, the steering pulley 13 is separately connected to the lifting device, and its height is above the clamp plate, the unlocking steel rope 14 is connected to the lock bolt 15, and the direction of the unlocking force is adjusted by the steering pulley 13. When unlocking and releasing is required, the unlocking steel rope 14 is pulled to open the lock bolt 15. After the limit of the side lever 2 is released, the hook head of the main lever 9 releases the lower connecting ring body 7 through the linkage relationship of the three-stage lever assembly.

[0030] The release lock mainly implements the following functions:

[0031] 1) The lock is in a locked state when the lock bolt is not pulled out and will not be unlocked.

[0032] 2) The lock is unlocked by pulling the unlocking steel rope, releasing the locking bolt and releasing the lower connecting ring.

[0033] 3) The lock plays a connecting role in the locked state and can withstand a large load.

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] 1) The structure of this lock is as follows Figure 1 As shown, in order to show the internal structure, a part of the upper surface of No. 6 is hidden, mainly as follows:

[0036] The lock fixing assembly includes: an upper clamping plate 6, a lower clamping plate 4, an upper connecting ring body 12, a positioning pin 10, a side bolt shaft 5, a main bolt shaft 8, and a middle bolt shaft 11. The lever assembly includes: a side lever 2, a middle lever 3, and a main lever 9. The detachable assembly is a lower connecting ring body 7. The locking mechanism is a locking bolt mechanism 1. The unlocking device includes a steering pulley assembly 13 and an unlocking steel rope 14.

[0037] 2) The steering pulley assembly 13 includes a pulley 24, a pulley bracket 23, and a pin 22. The pulley 24 is a disk with a groove on the outer circumference and a through hole at the center. The pin 22 is a bare rod, and the pulley bracket 23 is a cylindrical metal rod with hemispherical ends. A groove is opened at one end of the metal rod, and a large and a small circular hole are opened on one side of the groove. When assembling, the pulley 24 is placed in the groove of the pulley bracket 23. After the pin 22 passes through the pulley bracket 23 and the hole of the pulley 24 from the end with the large hole, it is interference-fitted with the small hole of the pulley bracket 23. The other end of the pulley bracket 23 has a hole for passing a rope ring to hang the steering pulley assembly in a suitable position.

[0038] 3) The unlocking steel rope 14 is a thin steel rope, one end of which is tied to the locking bolt mechanism 1. After the unlocking steel rope 14 passes through the groove of the disc of the diverting pulley 13, it can be reversed. The other end of the unlocking steel rope 14 is a pulling end.

[0039] 4) The locking bolt mechanism includes a connecting bolt 16, a limiting screw sleeve 17, a limiting pin 18, a limiting spring 19, a guide column 20, a locking bolt spring 21 and a locking bolt 15, and its structure is as follows: Figure 2 shown.

[0040] One end of the lock bolt 15 has two ears, one ear is provided with a through hole, and the other ear is provided with a threaded hole. After the connecting bolt 16 passes through the through hole and the unlocking steel rope 14, it is fastened through the threaded hole; there is a long square slot structure in the middle of the lock bolt 15, and the guide column 20 can slide freely in the square slot. The inner plane at the lower end of the square slot is provided with a raised step to guide and limit the lock bolt spring 21; two bosses extend from the side of the other end of the lock bolt 15, and the bosses can slide in the square and round slots of the upper clamping plate 6 and the lower clamping plate 4. When in the locked position, the end of the lock bolt 15 has a limiting effect on the end of the side lever 2.

[0041] The limiting screw sleeve 17 is a shell structure, with a threaded structure on the outside of the open end, which is threadedly connected to the corresponding hole of the upper clamping plate 6. A small hole is opened at the bottom of the shell to mount the limiting pin 18; a circle of steps is provided on the outside of the bottom of the limiting screw sleeve 17 to play an axial limiting role.

[0042] The limit pin 18 is a three-section stepped rod-shaped part, which can slide freely in the limit screw sleeve 17; the limit spring 19 is a compression spring, which is installed between the limit screw sleeve 17 and the limit pin 18 to reset the limit pin 18.

[0043] The guide post 20 is a square rod, and cylindrical rods are provided at both ends of the guide post 20, which are connected to the upper clamping plate 6 and the lower clamping plate 4; a square boss is provided on one side of the square rod to guide and limit the locking bolt spring 21.

[0044] The lock bolt spring 21 is a compression spring and is located between the guide column 20 and the bottom of the square groove of the lock bolt 15 .

[0045] When the limit pin 18 is in the pulled-out state, the lock bolt 15 is in the locked state. Pull the lock bolt 15, the limit pin 18 slides into the square groove of the lock bolt 15, the lock bolt 15 is unlocked and remains unlocked, and the release lock remains released.

[0046] 5) The side lever 2, the middle lever 3, the main lever 9, the side bolt shaft 5, the middle bolt shaft 11 and the main bolt shaft 8 form a three-stage lever assembly. The side lever 2 is a bean sprout-shaped lever with a through hole at its head; the middle lever 3 is a teardrop-shaped lever with a through hole at the large end; the main lever 9 is a hook-shaped lever with a 90-degree flat hook at the head and a through hole in the middle of the hook handle; the side bolt shaft 5 is a three-section stepped rod-shaped part with threads at both ends; the middle bolt shaft 11 is a five-section stepped rod-shaped part with threads at both ends; and the main bolt shaft 8 is also a five-section stepped rod-shaped part with threads at both ends. The upper clamping plate 6 and the lower clamping plate 4 are positioned by the side shoulders of the side bolt axis 5, the middle bolt axis 11 and the main bolt axis 8 to form a cavity. The side bolt axis 5 is located on one side of the bottom of the upper clamping plate 6 and the lower clamping plate 4, the middle bolt axis 11 is located in the upper and middle parts of the upper clamping plate 6 and the lower clamping plate 4, and the main bolt axis 8 is located on the other side of the bottom of the upper clamping plate 6 and the lower clamping plate 4; the side bolt axis 5, the middle bolt axis 11 and the main bolt axis 8 pass through the through holes of the side lever 2, the middle lever 3 and the main lever 9, and the three-stage lever is installed in a fixed position in the cavity in a vertical "Z" shape; the inner side of the end of the side lever 2 contacts the end of the locking bolt 15, the end of the middle lever 3 contacts the outer side of the head of the side lever 2, the end of the hook handle of the main lever 9 contacts one side of the large end of the middle lever 3, and the hook head is connected to the lower connecting ring body 7 to form a three-stage lever force transmission structure, and the three-stage lever can be flexibly rotated around their respective bolt axes according to a fixed trajectory in the cavity.

[0047] 6) The positioning pin 10 is a three-section stepped shaft, which is located between the upper clamping plate 6 and the lower clamping plate 4, limiting the movement range of the main lever 9, thereby forming a three-stage lever fixing working procedure.

[0048] 7) The upper splint 6 and the lower splint 4 are two rectangular plates with a certain thickness. The upper splint 6 and the lower splint 4 are placed opposite to each other with a certain distance between them. A concave opening square groove is formed on one side of the upper splint 6 and the lower splint 4. After the square groove cooperates with the hook head of the main lever 9, a square hole is formed, which can cooperate with the ring body bolt of the lower connecting ring body 7; a circular through hole is formed at the other short side of the upper splint 6 and the lower splint 4 that is colinear with the concave opening square groove, and its size matches the diameter of the ring body bolt of the upper connecting ring body (12) for assembling the upper connecting ring body 12; the upper splint 6 and the lower splint 4 are provided with a circular through hole on the side of the opening square groove, the upper Three groups of through holes are opened below the square and circular through holes for assembling the three-stage lever assembly, and the size of the holes matches the outer diameter of the corresponding lever bolts; a group of small through holes are opened at the same position of the upper clamping plate 6 and the lower clamping plate 4 for assembling with the positioning pin (10), and the position arrangement between the bolt holes of the three-stage lever assembly and the small through holes is approximately in a "Z" shape; a long square and circular groove hole is also opened on the other side opposite to the small through hole, which matches with the bosses on both sides of the lock bolt 15 in the lock bolt mechanism 1, and the lock bolt 15 boss can slide back and forth in the groove; a threaded hole is opened on the upper side of the square and circular groove hole of the upper clamping plate 6 for assembling the limiting screw sleeve 17 in the lock bolt mechanism 1.

[0049] 8) The upper connecting ring body 12 and the lower connecting ring body 7 mainly include a ring body, a ring body bolt and a nut; the ring body is a U-shaped ring, and a through hole is opened at the U-shaped opening to assemble the ring body bolt and the nut; the upper connecting ring body 12 is connected to the upper clamping plate 6 and the lower clamping plate 4 through the ring body bolt, and the lower connecting ring body 7 is placed in the flat hook of the main lever 9; the U-shaped part of the upper connecting ring body 12 is connected to the upper sling, and the U-shaped part of the lower connecting ring body 7 is connected to the lower sling.

[0050] Description of work process

[0051] The structure of this lock is as follows Figure 1 As shown, in order to show the internal structure, a part of the upper surface of No. 6 is hidden. The main working process is as follows:

[0052] 1) Pull the limit pin and check whether the lock bolt is locked. Connect the lifting strap of the test piece to the lower connecting ring and the lifting strap to the upper connecting ring.

[0053] 2) Cut the protective rope ring as required, tie it to the upper connecting ring body and the lower connecting ring body, and tie the steering pulley to the appropriate position.

[0054] 3) Tie the unlocking rope to the connecting bolt of the lock bolt and pass it through the steering pulley.

[0055] 4) After lifting the test piece to the required height, pull the unlocking rope, pull the locking bolt upwards to release the limit of the opposite side lever.

[0056] 5) After the side lever moves, the limits of the middle lever and the main lever are released in turn. Under the action of the gravity of the test piece, the lower connecting ring body separates from the structure of the main lever to complete the release action.

[0057] 6) Turn the three-stage lever assembly back into the cavities of the upper and lower clamping plates in turn, pull out the limit pin, and the lock bolt is reset and locked under the action of the lock bolt spring, and the side lever is limited again.

[0058] After many tests, the present invention can realize the ground impact test of large-tonnage test pieces. In the locked state, the release lock can realize the connection effect. When the unlocking steel rope is pulled to release the lock bolt, the main lever hook releases the lower connecting ring body, and the test piece falls in a free fall state. When unlocking and releasing, the test personnel can use the unlocking device to stay away from the test piece and operate the unlocking on the ground to ensure safety. After the lever assembly reduces the force, the test personnel can unlock the release lock by manpower. The protective rope ring can effectively prevent the lower connecting ring body from falling onto the test piece and damaging the test piece. Therefore, the design purpose is achieved.

Claims

1. A release lock for ground impact test, characterized in that: It comprises five parts: a clamping plate, a locking bolt mechanism (1), a three-stage lever assembly, a connecting ring body and an unlocking device; The clamping plates serve as a mounting base and a load-bearing component for releasing other components of the lock; the locking bolt mechanism (1) is assembled between the clamping plates and is located at the upper edge of the long sides of the clamping plates; The three-stage lever assembly is assembled between the clamping plates and is located at the middle and lower part of the clamping plates. The side lever (2) in the three-stage lever assembly contacts the locking bolt (15) in the locking bolt mechanism (1) and is limited by the locking bolt (15). The connecting ring body is divided into an upper connecting ring body (12) and a lower connecting ring body (7). The upper connecting ring body (12) is assembled on the top of the clamping plate, and the lower connecting ring body (7) is located at the bottom of the clamping plate and is connected to the hook head of the main lever (9) in the three-stage lever assembly. The upper connecting ring body (12) connects the clamping plate with the lifting device, and the lower connecting ring body (7) connects the hook head of the main lever (9) with the test object. The unlocking device comprises a steering pulley (13) and an unlocking steel rope (14). The steering pulley (13) is connected to the lifting device alone and is located above the clamping plate. The unlocking steel rope (14) is connected to the lock bolt (15). The direction of the unlocking force is adjusted by the steering pulley (13). When unlocking and releasing is required, the unlocking steel rope (14) is pulled to open the lock bolt (15). After the limit of the side lever (2) is released, the hook head of the main lever (9) releases the lower connecting ring body (7) through the linkage relationship of the three-stage lever assembly.

2. The release lock for bottom impact test according to claim 1, characterized in that: The clamping plate comprises an upper clamping plate (6) and a lower clamping plate (4), wherein the upper clamping plate (6) and the lower clamping plate (4) are two rectangular plates with a certain thickness, and the upper clamping plate (6) and the lower clamping plate (4) are placed opposite to each other with a certain distance between them. A concave opening square groove is formed on one short side of the upper clamping plate (6) and the lower clamping plate (4), and the square groove cooperates with the hook head of the main lever (9) to form a square hole that can cooperate with the ring body bolt of the lower connecting ring body (7); a circular through hole is formed at the other short side of the upper clamping plate (6) and the lower clamping plate (4) that are colinear with the concave opening square groove, and the size of the circular through hole matches the diameter of the ring body bolt of the upper connecting ring body (12) for assembling the upper connecting ring body (12); the upper clamping plate (6) and the lower clamping plate (4) are colinear with the concave opening square groove, and the circular through hole is matched with the diameter of the ring body bolt of the upper connecting ring body (12) for assembling the upper connecting ring body (12); The clamping plate (4) has three groups of through holes on the side, top and bottom of the open square groove for assembling the three-stage lever assembly, and the size of the holes matches the outer diameter of the corresponding lever bolts; the upper clamping plate (6) and the lower clamping plate (4) have a group of small through holes at the same position for assembling with the positioning pin (10), and the position arrangement between the three-stage lever assembly bolt holes and the small through holes is approximately in a "Z" shape; the other side opposite to the small through hole is also provided with a long square and round slot hole, which matches with the bosses on both sides of the lock bolt (15) in the lock bolt mechanism (1), and the lock bolt (15) boss can slide back and forth in the slot; the upper clamping plate (6) has a threaded hole on the upper side of the square and round slot hole for assembling the limit screw sleeve (17) in the lock bolt mechanism (1).

3. The release lock for bottom impact test according to claim 1, characterized in that: The locking bolt mechanism (1) comprises a connecting bolt (16), a limiting screw sleeve (17), a limiting pin (18), a limiting spring (19), a guide column (20), a locking bolt spring (21) and a locking bolt (15); one end of the locking bolt (15) has two ear pieces, one ear piece is provided with a through hole, and the other ear piece is provided with a threaded hole, and the connecting bolt (16) passes through the through hole and the unlocking steel rope (14) and is fastened through the threaded hole; a long square slot hole structure is provided in the middle of the locking bolt (15), and the guide column (20) can slide freely in the square slot, and a raised step is provided on the inner plane of the lower end of the square slot to guide and limit the locking bolt spring (21); two bosses extend from the side of the other end of the locking bolt (15), and the bosses can slide in the square and round slots of the upper clamping plate (6) and the lower clamping plate (4), and when in the locked position, the end of the locking bolt (15) has a limiting effect on the end of the side lever (2); The limiting screw sleeve (17) is a shell structure, and a threaded structure is arranged on the outside of the open end, which is threadedly connected with the corresponding hole of the upper clamping plate (6). A small hole is opened at the bottom of the shell to mount the limiting pin (18); a circle of steps is arranged on the outside of the bottom of the limiting screw sleeve (17) to play an axial limiting role.

4. The release lock for bottom impact test according to claim 3, characterized in that: The limit pin (18) is a three-section stepped rod-shaped part, which can slide freely in the limit screw sleeve (17); the limit spring (19) is a compression spring, which is installed between the limit screw sleeve (17) and the limit pin (18) to play a role in resetting the limit pin (18).

5. The release lock for bottom impact test according to claim 3, characterized in that: The guide column (20) is a square rod, and cylindrical rods are provided at both ends of the guide column (20) and connected to the upper clamping plate (6) and the lower clamping plate (4); a square boss is provided on one side surface of the square rod to guide and limit the locking bolt spring (21); the locking bolt spring (21) is a compression spring, and is located between the guide column (20) and the bottom of the square groove of the locking bolt (15).

6. The release lock for bottom impact test according to claim 1, characterized in that: The three-stage lever assembly comprises a side lever (2), a middle lever (3), a main lever (9), a side bolt shaft (5), a middle bolt shaft (11) and a main bolt shaft (8); the side lever (2) is a bean sprout-shaped lever with a through hole at its head; the middle lever (3) is a teardrop-shaped lever with a through hole at its large end; the main lever (9) is a hook-shaped lever with a 90-degree flat hook at its head and a through hole at the middle of the hook handle; the side bolt shaft (5) is a three-section stepped rod-shaped part with threads at both ends; the middle bolt shaft (11) is a five-section stepped rod-shaped part with threads at both ends; and the main bolt shaft (8) is a five-section stepped rod-shaped part with threads at both ends. The upper clamping plate (6) and the lower clamping plate (4) are positioned by the side shoulders of the side bolt shaft (5), the middle bolt shaft (11) and the main bolt shaft (8) to form a cavity. The side bolt shaft (5) is located on one side of the bottom of the upper clamping plate (6) and the lower clamping plate (4). The middle bolt shaft (11) is located in the upper middle part of the upper clamping plate (6) and the lower clamping plate (4). The main bolt shaft (8) is located on the other side of the bottom of the upper clamping plate (6) and the lower clamping plate (4). The side bolt shaft (5), the middle bolt shaft (11) and the main bolt shaft (8) pass through the side lever (2), The through holes of the middle lever (3) and the main lever (9) are used to install the three-stage lever in a vertical "Z" shape at a fixed position in the cavity; the inner side of the end of the side lever (2) contacts the end of the lock bolt (15), the end of the middle lever (3) contacts the outer side of the head of the side lever (2), the end of the hook handle of the main lever (9) contacts one side of the large end of the middle lever (3), and the hook head is connected to the lower connecting ring body (7), forming a three-stage lever force transmission structure, and the three-stage lever can flexibly rotate around the respective bolt axes in the cavity according to a fixed trajectory.

7. The release lock for bottom impact test according to claim 1, characterized in that: The positioning pin (10) is a three-section stepped shaft, which is located between the upper clamping plate (6) and the lower clamping plate (4) and close to the end of the hook handle of the main lever (9).

8. The release lock for bottom impact test according to claim 1, characterized in that: The connecting ring body comprises a ring body, a ring body bolt and a nut; the ring body is a U-shaped ring, and a through hole is opened at the U-shaped opening for assembling the ring body bolt and the nut; the upper connecting ring body (12) is connected to the upper clamping plate (6) and the lower clamping plate (4) through the ring body bolt, and the lower connecting ring body (7) is placed in the flat hook of the main lever (9); the U-shaped part of the upper connecting ring body (12) is connected to the upper sling, and the U-shaped part of the lower connecting ring body (7) is connected to the lower sling.

9. The release lock for bottom impact test according to claim 1, characterized in that: The deflection pulley (13) comprises a pulley (24), a pulley bracket (23), and a pin (22); the pulley (24) is a disk with a groove on the outer circumference and a through hole at the center of the circle; the pulley bracket (23) is a cylindrical metal rod with hemispherical ends, one end of the metal rod is provided with a groove, and one side of the groove is provided with a large and a small circular hole. When assembling, the pulley (24) is placed in the groove of the pulley bracket (23), and the pin (22) is simultaneously passed through the large hole at one end and the small hole at the other end. After passing through the holes of the pulley bracket (23) and the pulley (24), the pulley bracket (23) is interference-fitted with the small hole of the pulley bracket (23). The other end of the pulley bracket (23) is provided with a hole for passing a rope ring to hang the deflection pulley (13) at a suitable position. The unlocking steel rope (14) is a thin steel rope, one end of which is tied to the locking bolt mechanism (1). After the unlocking steel rope (14) passes through the groove of the deflection pulley (13) disc, it can be reversed. The other end of the unlocking steel rope (14) is a pulling end.

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