A test device and test method for arresting hook repeatability testing

Abstract

The application discloses a test device and a test method for repeated tests of arresting hooks, and relates to the field of tests of shipboard arresting hooks. The loading conditions of the shipboard arresting hooks during landing are simulated through free fall, rotary motion and other methods, so that the impact dynamic durability of the designed arresting hook is verified, and effective ground test parameters are provided for the design and manufacture of the arresting hook. The test device comprises a test bench, a lifting system, an unhooking device, a hanging basket and a buffer. A system comprising a rotating disc collision subsystem and a rotating cable arresting subsystem is arranged beside the test bench, and the system is capable of rapidly switching, so that the arresting hook is subjected to collision tests and cable hanging tests. The application achieves the purpose of repeated tests as a whole, and the long waiting time in the repeated test process is not needed, so that the test efficiency is greatly improved, the energy consumption cost of the test is reduced, and the operation convenience is improved.

Description

Technical Field

[0001] This invention relates to the field of arresting hook testing for carrier-based aircraft, and more particularly to a device and method for testing the durability of arresting hooks for carrier-based aircraft. Background Technology

[0002] An arresting hook is a device installed at the tail of a carrier-based aircraft to facilitate a smooth landing of the aircraft on the ship's deck. To ensure a controllable service life and effective operation, the arresting hook typically undergoes various load tests. Existing testing equipment mainly focuses on three aspects: One example is the Chinese invention patent application CN110243564A, entitled "Test Device and Test Method for Impact Load Testing of Arresting Hook Cables." This patent discloses a test device that can solve the problem of difficulty in obtaining the dynamic impact response of arresting hook cables during carrier landings in the prior art. When using this device, the arresting hook needs to be raised first, and then the arresting hook is lowered while the steel cable is kept rotating, so that the arresting hook engages with the steel cable, and finally the multi-directional impact load on the arresting hook is obtained. However, although such devices can solve the technical problems described, because the steel cable clamp is directly hinged to the end of the steel cable, and the hinge axis is perpendicular to the center of rotation, it is very easy to break at the hinge position, which leads to an increase in test costs and test preparation time in multiple tests.

[0003] Secondly, there is the Chinese invention patent application CN105181287A, entitled "Experimental Device and Method for Simulating Arresting Hook Impact on Deck," which discloses an experimental device that can effectively solve the problem of difficulty in obtaining the dynamic response of arresting hook impact on deck during carrier-based aircraft landing. When using this device, the arresting hook also needs to be raised first, and then the arresting hook is lowered while keeping the collision disk rotating, so that the arresting hook impacts the collision disk, ultimately simulating the process of the arresting hook impacting the deck. However, although such devices can solve the technical problems described, when repeating the test, the collision disk with a huge moment of inertia needs to be stopped, and then the collision disk needs to be restarted after raising the arresting hook. This process not only consumes a lot of energy, but also requires a very long preparation time.

[0004] Third, tensile fatigue tests are conducted on the arresting hook in different directions. Traditional testing equipment usually requires repeated disassembly and assembly of the arresting hook to achieve the purpose of changing the direction of the arresting hook, which also has the disadvantages of inconvenient operation and long preparation time. Summary of the Invention

[0005] To address the above problems, this invention proposes a convenient and easy-to-use test device for repeated arresting hook tests. By simulating the load conditions of the arresting hook during carrier landing through methods such as free fall and rotational motion, the device can perform repeated tests according to the design load spectrum of the arresting hook, thereby verifying the dynamic durability of the designed arresting hook and providing effective ground test parameters for the design and manufacture of arresting hooks.

[0006] The technical solution of the present invention is as follows: the test device includes a test bench 2, a lifting system 1, a release device 3, a basket 4, and a buffer 6. The test bench 2 has a vertical guide rail. The lifting system 1 is located above the vertical guide rail. The basket 4 is slidably connected to the vertical guide rail. The release device 3 is connected to the output end of the lifting system 1. The blocking hook 5 is installed on the basket 4 and is detachably connected to the release device 3. The blocking hook 5 includes a hook head 31 and a pair of hook arms 32. The root of the hook arms is installed on the basket 4 through a hook arm mounting clamp. The buffer 6 is vertically arranged below the basket 4 and is fixedly connected to the test bench 2. A system for quickly switching between the turntable collision subsystem and the cable blocking subsystem is set up on one side of the test bench 2. The two subsystems are located on the same conversion platform 30 and can be quickly switched, so that the collision test and cable hanging test can be performed on the blocking hook 5 respectively. The turntable collision subsystem includes a collision system 7 and an anti-wear system. The collision system 7 includes a turntable motor 8, a turntable 12, and a base 10. In use, the base 10 is switched to the position below the blocking hook 5. The turntable 12 is rotatably mounted on the base 10. The housing of the turntable motor 8 is fixedly connected to the base 10, and the output shaft of the turntable motor 8 is connected to the turntable 12. The turntable 12 is driven to rotate by the turntable motor 8. The wear-resistant system includes a hook bouncing platform 15, an aluminum contact head 14, a hydraulic cylinder 16, and a support base 17. The hook bouncing platform 15 and the support base 17 are fixedly arranged on the front and rear sides of the base 10, respectively. The hydraulic cylinder 16 is arranged at an angle, with its bottom end fixedly connected to the support base 17, and its top end connected to the aluminum contact head 14. Thus, when the arresting hook and basket leave the release device, they will fall and impact the continuously rotating turntable, simulating the process of the arresting hook impacting the deck. After the impact... As the arresting hook and the basket continue to descend, the hook head will bounce and land on the hook head bounce platform 15, awaiting the next test. Notably, in this case, the turntable does not need to be stopped for the next test. Instead, the hydraulic cylinder is controlled to extend upward, so that the aluminum contact head 14 extends obliquely upward above the turntable. After that, the release device is combined with the basket and the release device is raised. In this way, the arresting hook will no longer interfere with the turntable during the upward movement, achieving the goal of repeated testing without stopping the machine and effectively reducing the test preparation time during the collision test.

[0007] The cable-operated arresting subsystem includes a cable-operated platform 19, a rotating shaft 23, a motor 27, and a cable 24. In use, the cable-operated platform 19 is switched to the position below the arresting hook 5. The two ends of the rotating shaft 23 are rotatably mounted on the cable-operated platform 19. The housing of the motor 27 is fixedly connected to one side of the cable-operated platform 19, and the output shaft of the motor 27 is connected to the rotating shaft 23, thereby driving the rotating shaft 23 to rotate. The cable 24 has cable sleeves 22 fixedly connected to both ends, and a cable support 21 is fixedly connected to the rotating shaft 23. The cable support 21 has a receiving groove adapted to the cable sleeve 22, and a positioning pin is provided in the receiving groove. After the cable sleeve 22 is inserted into the receiving groove, it is locked by the positioning pin. In this way, compared with the connection method of the prior art, the cable sleeve 22 is inserted into the cable support 21 first and then locked and positioned, thereby avoiding the problems of poor stability, short service life and easy breakage caused by a single hinge relationship. In use, the rotating shaft 23 is driven by the rotating motor 27 to keep the cable rotating, so that the cable hanging test can be carried out after the arresting hook falls. Since the service life of the cable arresting subsystem in this case is much longer than that of the prior art, this case has the advantages of low use cost and short test preparation time compared with the prior art. While ensuring the efficiency of rope use, the time for steel cable replacement is reduced; and the strength of the steel cable is utilized to the maximum extent, with the steel cable running hundreds of times, which greatly saves the time and material costs of cable hanging durability.

[0008] Furthermore, the switching platform 30 includes a pit slide rail and a switching actuation cylinder. The base 10 in the turntable collision subsystem and the cable-turning platform 19 in the cable-turning barrier subsystem are fixedly connected, and both are slidably connected to the pit slide rail. The cylinder body of the switching actuation cylinder is fixedly arranged at one end of the switching guide rail, and the output end of the switching actuation cylinder is fixedly connected to the base 10.

[0009] Furthermore, a turntable bearing 11 is fixedly mounted on the base 10, and the center of the turntable 12 is mounted on the turntable bearing 11. Additionally, multiple universal ball bearings 13 are also mounted on the base 10, with the top ends of the universal ball bearings 13 contacting the bottom surface of the turntable 12. This ensures the smooth operation of the turntable and provides stable support to the turntable during simulated impacts, thereby reducing experimental errors caused by turntable deflection.

[0010] The turntable motor 8 is vertically mounted on one side of the turntable 12, and the output shaft of the turntable motor 8 is connected to the turntable 12 via a belt 9.

[0011] The turntable collision subsystem also includes a hydraulic brake 18 arranged between the base 10 and the turntable 12. The hydraulic brake 18 includes a hydraulic push rod, a transmission cable, a brake push rod, and brake pads. The hydraulic push rod is fixedly connected to the base 10, is vertically arranged, and its middle portion is hinged to the base 10. The top end of the brake push rod is fixedly connected to the brake pads, and the brake pads are at the same height as the turntable 12. The two ends of the transmission cable are respectively fixedly connected to the piston rod of the hydraulic push rod and the bottom end of the brake push rod. Thus, by pulling the bottom end of the brake push rod away from the turntable, the brake pads can be pressed against the turntable, thereby stopping the turntable. Specifically, since the turntable simulates a carrier-based aircraft deck, it has a certain weight. After the motor stops, the high-speed turntable continues to rotate at high speed due to inertia, requiring a specific braking device to stop the turntable's operation. The motor emergency stop is included in the control system. The braking device is a brake pad customized for the turntable and installed on the lever mechanism. The brake pad is pressed onto the turntable by a hydraulic cylinder pulling the connecting steel cable, thereby stopping the turntable.

[0012] Furthermore, the axis of the rotating motor 27 is parallel to the axis of the rotating shaft 23, and the end of the rotating shaft 23 is connected to a clutch 25. The output shaft of the rotating motor 27 and the clutch 25 are linked together by a rotating cable belt 26.

[0013] The method for repeated arresting hook tests is as follows: Arresting hook landing parameters, including heading speed and sinking speed, are randomly distributed. A large number of parameters are divided into equal-sized random small blocks, ensuring uniform distribution under extreme conditions. In MATLAB, the N working conditions are evenly divided into n random small blocks. Each working condition contains a heading speed value and a sinking speed value, and each random small block contains N / n times. First, determine the magnitudes of the limit number of working conditions M and the even division n. If 2n > M > n, first subtract M working conditions from the N working conditions, then subtract (2n - M) working conditions, and randomly distribute the remaining (N - 2n) working conditions into n small blocks. Then, sequentially add the previously selected M working conditions and M - n working conditions to the n small blocks. If M < n, first subtract n working conditions from the N working conditions, and randomly distribute the remaining (N - n) working conditions into n small blocks. Then, sequentially add the previously selected n working conditions to the n small blocks. The parameters in the small blocks are randomized again, and finally, n parameter small blocks with equal randomness are obtained. Then, according to the n parameter small blocks, alternately conduct the arresting hook ship contact collision test N / n times and the cable hanging impact test N / n times; both systems are controlled by a computer, and the parameters in the random small blocks are tested sequentially to complete multiple random cycles.

[0014] The arresting hook ship contact collision test includes the following steps: A1. After the hanging basket is clamped and lifted by the unhooking device to reach the predetermined height, it stops; A2. The turntable starts to rotate to reach the specified speed; A3. The unhooking device releases, and the arresting hook touches the turntable and bounces; A4. The hydraulic cylinder in the anti-wear system extends to support the arresting hook; A5. The lifting system lowers the unhooking device and closes the unhooking device after contacting the hanging basket; A6. The lifting system lifts the arresting hook to a preset height away from the turntable, and the hydraulic cylinder in the anti-wear system contracts to the shortest position; A7. The lifting system lifts the hanging basket to the next specified height.

[0015] The arresting hook cable hanging impact test includes the following steps: B1. After the hanging basket is clamped and lifted by the unhooking device to reach the predetermined height, it stops; B2. The cable reel starts to rotate and reaches the specified speed through the feedback of the speed sensor; B3. The unhooking device releases, the clutch of the cable reel system disengages, and the arresting hook system impacts the hanging cable; B4. The lifting system lowers the unhooking device and closes the unhooking device after contacting the hanging basket; B5. The lifting system lifts the hanging basket to the next specified height.

[0016] When switching between the arresting hook ship contact collision test and the cable hanging impact test, the following steps are included: C1. Stop the operation of all motors of the turntable system and the cable hanging system; C2. When the suspended platform is raised to a safe height, the turntable collision subsystem and the cable restraint subsystem on the pit slide rail are switched by switching the actuating cylinder, thereby realizing the rapid switching between the turntable collision subsystem and the cable restraint subsystem.

[0017] This invention proposes a turntable collision subsystem and a cable-operated restraint subsystem, which can be quickly switched when collision tests and cable-operated tests are required. It has the following advantages: First, in this case, because an anti-wear system was added to the turntable collision subsystem, the turntable can be re-tested after an impact without stopping the turntable. Instead, the hydraulic cylinder is controlled to extend upwards, causing the aluminum contact head to extend obliquely upwards above the turntable. After that, the release device is combined with the basket and the release device is lifted. In this way, the arresting hook will no longer interfere with the turntable during the upward movement, achieving the goal of repeated testing without stopping the machine and effectively reducing the test preparation time during the collision test.

[0018] Second, the cable-switching arresting subsystem in this case inserts the cable sleeve into the cable-switching support before locking it in place. This avoids the problems of poor stability, short lifespan, and easy breakage caused by a single hinged connection. The service life of the cable-switching arresting subsystem in this case is much longer than that of existing technologies. Therefore, compared with existing technologies, this case has the advantages of low operating cost and short test preparation time. While ensuring the efficiency of rope use, it reduces the time for steel cable replacement; and it maximizes the utilization of the steel cable's strength, with the steel cable operating hundreds of times, greatly saving time and material costs for cable durability.

[0019] In summary, this invention achieves the goal of enabling repeated testing without requiring long waiting times, thus significantly improving testing efficiency, reducing energy consumption costs, and enhancing operational convenience. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the case during the crash test. Figure 2 yes Figure 1 3D image, Figure 3 This is a structural diagram of the turntable collision subsystem in this case. Figure 4 This is a schematic diagram of the turntable in this case. Figure 5 This is a structural diagram of the cable-stayed arresting subsystem in this case. Figure 6 This is a schematic diagram of the switching base for the two systems in this case. Figure 7 This is a flowchart of the turntable collision subsystem. Figure 8This is a flowchart of the cable-stayed arresting subsystem. In the diagram: 1-Lifting system, 2-Test bench, 3-Unhooking device, 4-Suspended basket, 5-Barrier hook, 6-Buffer, 7-Collision system, 8-Turntable motor, 9-Belt, 10-Base, 11-Turntable bearing, 12-Turntable, 13-Universal ball bearing, 14-Aluminum contact head, 15-Hook head bounce platform, 16-Hydraulic cylinder, 17-Support base, 18-Hydraulic brake, 19-Rope swing platform, 20-Rope swing bearing, 21-Rope swing support, 22-Rope sleeve, 23-Rotating shaft, 24-Rope, 25-Clutch, 26-Rope swing belt, 27-Rotating motor, 28-Switching actuation cylinder, 29-Pit slide rail, 30-Converter. Detailed Implementation

[0021] To clearly illustrate the technical features of this patent, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0022] The present invention is as follows Figure 1-6 As shown, a repeatable test procedure was designed to simulate all the dynamic states of the arresting hook of a carrier-based aircraft from the initial contact with the aircraft carrier until the aircraft is stopped on the deck by the arresting system. During the successful landing of the carrier-based aircraft, the arresting hook first impacts the ship's deck and bounces; during the bounce or after being pressed down by the arresting hook buffer and making contact with the ship's deck, the arresting hook impacts the arresting cable, thus engaging the arresting cable; after the arresting hook successfully engages the arresting cable, the arresting system stops the carrier-based aircraft from advancing, bringing it to a stop on the ship. The force and movement of the arresting hook during the entire process can be divided into three stages: arresting hook impact with the ship, arresting hook impact with the arresting cable, and arresting hook force transmission to stop the carrier-based aircraft. The arresting hook collision test bench simulates the sinking speed of the arresting hook before impact rebound by using a free fall basket on the test bench. The tangential velocity of the turntable in the collision turntable system simulates the heading speed of the arresting hook before impact rebound. In the repeated durability tests, parameters such as sinking speed and heading speed can be changed each time. Similarly, the arresting hook cable impact test bench simulates the sinking speed of the arresting hook before cable impact by using a free fall basket. The cable turntable system simulates the heading speed of the arresting hook before cable impact. In the repeated durability tests, parameters such as sinking speed and heading speed can be changed each time.

[0023] Specifically: The test apparatus includes a test bench 2, a lifting system 1, a release device 3, a basket 4, and a buffer 6. The test bench 2 has a vertical guide rail. The lifting system 1 is located above the vertical guide rail. The basket 4 is slidably connected to the vertical guide rail. The release device 3 is connected to the output end of the lifting system 1. An arresting hook 5 is installed on the basket 4 and is detachably connected to the release device 3. The arresting hook 5 includes a hook head 31 and a pair of hook arms 32. The root of the hook arms is installed on the basket 4 through a hook arm mounting clamp. The buffer 6 is vertically arranged below the basket 4 and is fixedly connected to the test bench 2. The test bench 2 includes a system for rapid switching between a turntable collision subsystem and a cable blocking subsystem. The two subsystems are located on the same switching platform 30 and can be quickly switched, thereby conducting collision tests and cable hanging tests on the blocking hook 5 respectively. The two systems are located in the pit in front of the test bench and are installed on the switching platform 30. A pit slide rail 29 is arranged under the switching platform, and the switching between the two systems can be achieved by extending and retracting the switching actuation cylinder 28.

[0024] In the above, the sinking speed of the arresting hook during landing is simulated by the falling of the arresting hook; the directional speed of the arresting hook when it touches the ship is simulated by the turntable; the directional speed of the arresting hook when it engages the cable is simulated by the tangential speed at the highest point of the cable rotation; and a high-speed linear velocity is provided by the high-speed rotation of the shaft, so that the arresting hook and the steel cable reach a landing simulation test speed when they engage.

[0025] like Figure 1-4 As shown, during the arresting hook landing and collision process, the vertical descent of the arresting hook simulates the sinking speed of the arresting hook before the landing collision. By observing the collision between the arresting hook and the deck, and the mechanical properties and motion state of the movable arresting hook after the collision, a turntable platform simulating the deck is crucial. Ordinary turntables, due to issues such as the clearance of the central bearing, the bending stiffness of the turntable, and the weight of the turntable, find it difficult to simulate the real stiffness of a ship's deck. Specifically, this design uses eight universal ball bearings at the bottom of the turntable. During turntable rotation, there is a slight gap between the ball bearings and the bottom of the turntable, which does not affect the rotation. If the gap disappears, the ball bearings can rotate simultaneously with the turntable, resulting in minimal friction. During the arresting hook's descent and impact, the ball bearings can withstand a vertical impact of 3.5 tons, ensuring the vertical stiffness of the turntable and simulating the real process of the arresting hook impacting the ship's deck.

[0026] The turntable collision subsystem includes a collision system 7 and an anti-wear system. The collision system 7 includes a turntable motor 8, a turntable 12, and a base 10. In use, the base 10 is fixedly arranged below the blocking hook 5. The turntable 12 is rotatably mounted on the base 10. The housing of the turntable motor 8 is fixedly connected to the base 10, and the output shaft of the turntable motor 8 is connected to the turntable 12, driving the turntable 12 to rotate. The wear-resistant system includes a hook bouncing platform 15, an aluminum contact head 14, a hydraulic cylinder 16, and a support base 17. The hook bouncing platform 15 and the support base 17 are respectively fixedly arranged on the front and rear sides of the base 10. The hydraulic cylinder 16 is arranged at an angle. The bottom end of the hydraulic cylinder 16 is fixedly connected to the support base 17, and the top end of the hydraulic cylinder 16 is connected to the aluminum contact head 14. During the test, after the arresting hook falls and impacts the turntable, it bounces off the turntable and onto the hook head bounce platform. The arresting hook remains stationary while the turntable continues to rotate at high speed. If the arresting hook is raised at this point, it will experience severe friction with the turntable, affecting the lifespan of both the arresting hook and the test bench. Therefore, an angled brace was designed to slightly lift the arresting hook. When the arresting hook is then raised further, it will slide on the smooth contact device. After the arresting hook is raised to a certain height away from the turntable, the brace retracts to prevent the hook head from catching on the contact device. In this way, when the arresting hook and the basket leave the release device, they will fall and impact the continuously rotating turntable, simulating the process of the arresting hook hitting the deck. After the impact, as the arresting hook and the basket continue to descend, the hook head will bounce and land on the hook head bounce platform 15, waiting for the next test. Notably, in this design, the turntable does not need to be stopped for the next test. Instead, the hydraulic cylinder needs to be controlled to extend upward, so that the aluminum contact head 14 extends obliquely upward above the turntable. After that, the release device is combined with the basket and the release device is lifted. In this way, the arresting hook will no longer interfere with the turntable during the upward movement, achieving the goal of repeated testing without stopping the machine, effectively reducing the test preparation time during the collision test.

[0027] like Figure 5 As shown, the arresting hook and cable impact test bench simulates the impact of the arresting hook against the arresting cable, studying the dynamics of the arresting hook and cable. However, due to the special manufacturing process and materials of the wire rope and its sheath, the wire rope sheath is extremely prone to breakage upon impact, generally only lasting 5-10 tests before breaking. This causes significant economic losses and safety hazards. This design incorporates a special cable-spinning support, installing the wire rope sheath connection within it to reinforce the sheath strength, increasing the lifespan of the wire rope used in the cable impact test to approximately 150 tests. This significantly reduces the economic and time costs of the test and minimizes safety hazards.

[0028] The cable-operated arresting subsystem includes a cable-operated platform 19, a rotating shaft 23, a motor 27, and a cable 24. In use, the cable-operated platform 19 is fixedly arranged below the arresting hook 5. The two ends of the rotating shaft 23 are rotatably mounted on the cable-operated platform 19. The housing of the motor 27 is fixedly connected to one side of the cable-operated platform 19, and the output shaft of the motor 27 is connected to the rotating shaft 23, driving the rotating shaft 23 to rotate. The cable 24 has cable sleeves 22 fixedly connected to both ends, and a cable support 21 is fixedly connected to the rotating shaft 23. The cable support 21 has a receiving groove adapted to the cable sleeve 22, and a positioning pin is provided in the receiving groove. After the cable sleeve 22 is inserted into the receiving groove, it is locked by the positioning pin. In this way, compared with the connection method of the prior art, the cable sleeve 22 is inserted into the cable support 21 first and then locked and positioned, thereby avoiding the problems of poor stability, short service life and easy breakage caused by a single hinge relationship. In use, the rotating shaft 23 is driven by the rotating motor 27 to keep the cable rotating, so that the cable hanging test can be carried out after the arresting hook falls. Since the service life of the cable arresting subsystem in this case is much longer than that of the prior art, this case has the advantages of low use cost and short test preparation time compared with the prior art. While ensuring the efficiency of rope use, the time for steel cable replacement is reduced; and the strength of the steel cable is utilized to the maximum extent, with the steel cable running hundreds of times, which greatly saves the time and material costs of cable hanging durability.

[0029] Furthermore, a turntable bearing 11 is fixedly installed on the base 10, and the center of the turntable 12 is mounted on the turntable bearing 11. In addition, multiple universal ball bearings 13 are also installed on the base 10, with the top of the universal ball bearings 13 contacting the bottom surface of the turntable 12. This ensures the smooth operation of the turntable and provides stable support for the turntable when a simulated impact occurs.

[0030] The turntable motor 8 is vertically mounted on one side of the turntable 12, and the output shaft of the turntable motor 8 is connected to the turntable 12 via a belt 9.

[0031] The turntable collision subsystem further includes a hydraulic brake 18 arranged between the base 10 and the turntable 12. The hydraulic brake 18 includes a hydraulic push rod, a transmission cable, a brake push rod and a brake pad. The hydraulic push rod is fixedly connected to the base 10. The brake push rod is vertically arranged and hinged to the base 10 at its middle part. The top end of the brake push rod is fixedly connected to the brake pad, and the brake pad is at the same height as the turntable 12. Both ends of the transmission cable are respectively fixedly connected to the piston rod of the hydraulic push rod and the bottom end of the brake push rod. In this way, by pulling the bottom end of the brake push rod away from the position of the turntable by the hydraulic push rod, the brake pad can be driven to press on the turntable, thereby stopping the turntable. Specifically, since the turntable simulates the carrier-based aircraft deck, it has a certain weight. After the motor stops rotating, the high-speed turntable still runs at a high speed due to inertia, and a specific braking device is required to stop the turntable. The sudden stop of the motor is included in the control system. The braking device is a brake pad customized for the turntable and installed on the lever mechanism. By pulling the connecting steel wire rope by the hydraulic cylinder, the brake pad is pressed tightly on the turntable to stop the turntable from rotating.

[0032] Further, the axis of the belt-driven motor 27 is arranged parallel to the axis of the rotating shaft 23. The end of the rotating shaft 23 is connected with a clutch 25. The output shaft of the belt-driven motor 27 and the clutch 25 are kept in linkage through a transfer cable belt 26.

[0033] The durability test requires repeated experiments to verify the durability of the arrester hook. During the service process of the arrester hook, the processes of the arrester hook touching the ship and hitting the cable are continuously repeated, and the parameters will change randomly. In order to ensure the real service situation of the arrester hook, the landing parameters of the arrester hook are randomly distributed. The landing parameters include the course speed and the sinking speed. A large number of parameters are cut into equal random small pieces, and the extreme working conditions are evenly distributed: In MATLAB, N working conditions are evenly divided into n random small pieces. Each working condition includes a course speed value and a sinking speed value. Each random small piece contains N / n times. First, judge the size of the number of extreme working conditions M and the even division n. If 2n > M > n, first subtract M working conditions from N working conditions, and then subtract (2n - M) working conditions, and randomly distribute the remaining (N - 2n) working conditions to n small pieces. Then, add the previously selected M working conditions and M - n working conditions to the n small pieces in turn. If M < n, first subtract n working conditions from N working conditions, and randomly distribute the remaining (N - n) working conditions to n small pieces. Then, add the previously selected n working conditions to the n small pieces in turn. The parameters in the small pieces are randomized again. Finally, n parameter small pieces with equal randomness are obtained. Then, according to the n parameter small pieces, the arrester hook ship-touching collision test and the cable-hanging impact test are alternately carried out N / n times; both systems are controlled by a computer, and the parameters in the random small pieces are tested in turn to complete multiple random cycles.

[0034] The arresting hook-and-ship collision test includes the following steps: A1. The suspended platform is lifted by the unhooking device to the predetermined height fed back by the displacement sensor and then stops. A2. The turntable starts rotating and reaches the specified speed through feedback from the speed sensor; A3. The uncoupling device is released, and the arresting hook system bounces upon contact with the ship. A4. The photoelectric sensor of the strut detects the barrier hook, and the strut extends forward a fixed distance to raise the barrier hook. A5. When the lifting system lowers the unhooking device and detects the suspended platform through the photoelectric sensor, the lowering stops and the unhooking device automatically closes after 5 seconds. A6. The lifting system raises the arresting hook to a preset height away from the turntable, and the support rod retracts to its shortest position (this does not affect the arresting hook's descent to impact the turntable, or the arresting hook's ascent). A7. The lifting system raises the suspended platform to the next designated height.

[0035] The arresting hook and cable impact test includes the following steps: B1. The suspended platform is lifted by the unhooking device to the predetermined height fed back by the displacement sensor and then stops. B2. The rotating cable begins to rotate and reaches the specified speed through feedback from the speed sensor; B3. The unhooking device is released, the cable-spinning system clutch is disengaged, and the arresting hook system is caught on the cable and impacts. B4. When the lifting system lowers the unhooking device and the photoelectric sensor detects the suspended platform, the lowering stops and the unhooking device automatically closes after 5 seconds. B5. The lifting system raises the suspended platform to the next designated height.

[0036] The switching process between arresting hook-contact collision tests and cable-operated impact tests includes the following steps: C1. Stop the operation of all motors in the turntable system and cable system; C2. When the suspended platform is raised to a safe height, the load-bearing test bench on the pit slide rail is stretched by switching the actuation cylinder, thereby activating the collision system and the cable system for rapid switching.

[0037] There are many specific ways to implement this invention. The above description is only a preferred embodiment of this invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this invention, and these improvements should also be considered within the scope of protection of this invention.

Claims

1. A test apparatus for repeated testing of a blocking hook, the test apparatus comprising a test bench (2), a lifting system (1), a hook releaser (3), a basket (4), and a buffer (6), wherein the test bench (2) has a vertical guide rail, the lifting system (1) is located above the vertical guide rail, the basket (4) is slidably connected to the vertical guide rail, the hook releaser (3) is connected to the output end of the lifting system (1), the blocking hook (5) is installed on the basket (4), the hook releaser (3) can be connected to and disconnected from the basket by opening and closing, and the buffer (6) is vertically arranged below the basket (4) and fixedly connected to the test bench (2); A turntable collision subsystem and a cable blocking subsystem are set up on one side of the test bench (2). The two subsystems are located on the same conversion table (30) and can be quickly switched so that the blocking hook (5) can be subjected to collision test and cable hanging test respectively. The turntable collision subsystem includes a collision system (7) and an anti-wear system. The collision system (7) includes a turntable motor (8), a turntable (12), and a base (10). When in use, the base (10) is switched to the bottom of the blocking hook (5). The turntable (12) is rotatably mounted on the base (10). The housing of the turntable motor (8) is fixedly connected to the base (10), and the output shaft of the turntable motor (8) is connected to the turntable (12). The turntable (12) is driven to rotate by the turntable motor (8). The wear-resistant system includes a hook spring platform (15), an aluminum contact head (14), a hydraulic cylinder (16), and a support base (17). The hook spring platform (15) and the support base (17) are fixedly arranged on the front and rear sides of the base (10), respectively. The hydraulic cylinder (16) is arranged at an angle. The bottom end of the hydraulic cylinder (16) is fixedly connected to the support base (17), and the top end of the hydraulic cylinder (16) is connected to the aluminum contact head (14). The cable-operated arresting subsystem includes a cable-operated platform (19), a rotating shaft (23), a motor (27), and a cable (24). In use, the cable-operated platform (19) is switched to the lower part of the arresting hook (5). The two ends of the rotating shaft (23) are rotatably mounted on the cable-operated platform (19). The housing of the motor (27) is fixedly connected to one side of the cable-operated platform (19), and the output shaft of the motor (27) is connected to the rotating shaft (23). The rotating shaft (23) is driven to rotate by the motor (27). The two ends of the cable (24) are fixedly connected to cable sleeves (22), and a rotating cable support (21) is fixedly connected to the rotating shaft (23). The rotating cable support (21) has a receiving groove adapted to the cable sleeve (22), and a positioning pin is provided in the receiving groove. After the cable sleeve (22) is inserted into the receiving groove, it is locked by the positioning pin.

2. The test apparatus for repeated testing of a stopping hook according to claim 1, characterized in that, The conversion table (30) includes a pit slide rail and a switching actuator cylinder. The base (10) in the turntable collision subsystem and the cable reel support frame (19) in the cable reel arresting subsystem are fixedly connected, and both are slidably connected to the pit slide rail. The cylinder body of the switching actuator cylinder is fixedly arranged at one end of the switching guide rail, and the output end of the switching actuator cylinder is fixedly connected to the base (10).

3. The test apparatus for repeated testing of a stopping hook according to claim 1, characterized in that, A turntable bearing (11) is fixedly installed on the base (10). The center of the turntable (12) is installed on the turntable bearing (11). In addition, a plurality of universal ball bearings (13) are also installed on the base (10). The top of the universal ball bearings (13) contacts the bottom surface of the turntable (12). The universal ball bearings (13) are centrally arranged below the turntable collision point, so as to reduce the error caused by the turntable deflection to the collision.

4. The test apparatus for repeated testing of a stopping hook according to claim 1, characterized in that, The axis of the motor with a belt (27) is arranged parallel to the axis of the rotating shaft (23). A clutch (25) is connected to the end of the rotating shaft (23). The output shaft of the motor with a belt (27) and the clutch (25) are kept in linkage through a cable reel belt (26).

5. A method for repeated testing of a blocking hook based on the testing apparatus of claim 1, characterized in that, Randomly distribute the arresting hook landing parameters. The landing parameters include the course speed and the sinking speed. Cut a large number of parameters into equal random small pieces and ensure that the extreme working conditions are evenly distributed: In MATLAB, divide N working conditions into n random small pieces evenly. Each working condition contains a course speed value and a sinking speed value. Each random small piece contains N / n times. First, judge the sizes of the number of extreme working conditions M and the even division n. If 2n>M>n, first subtract M working conditions from N working conditions, and then subtract (2n - M) working conditions, and randomly distribute the remaining (N - 2n) working conditions to n small pieces. Then, add the previously selected M working conditions and M - n working conditions to the n small pieces in turn. If M < n, first subtract n working conditions from N working conditions, and randomly distribute the remaining (N - n) working conditions to n small pieces. Then, add the previously selected n working conditions to the n small pieces in turn. Randomize the parameters in the small pieces again. Finally, obtain n parameter small pieces with equal randomness. Then, according to the n parameter small pieces, alternately conduct N / n times of arresting hook ship contact collision tests and N / n times of cable hanging impact tests. Both systems are controlled by a computer, and the parameters in the random small pieces are tested in turn to complete multiple random cycles.

6. The method for repeated testing of the arresting hook according to claim 5, characterized in that, The arresting hook ship contact collision test includes the following steps: A1. The hanging basket is clamped and lifted by the unhooking device and stops after reaching the predetermined height; A2. The turntable starts to rotate and reaches the specified speed; A3. The unhooking device releases, and the arresting hook touches the turntable and bounces; A4. The hydraulic cylinder in the anti-wear system extends to support the arresting hook; A5. The lifting system lowers the unhooking device and closes the unhooking device after contacting the hanging basket; A6. The lifting system lifts the arresting hook to a preset height away from the turntable, and the hydraulic cylinder in the anti-wear system contracts to the shortest position; A7. The lifting system lifts the hanging basket to the next specified height.

7. The method for repeated testing of the arresting hook according to claim 5, characterized in that, The arresting hook cable hanging impact test includes the following steps: B1. The hanging basket is clamped and lifted by the unhooking device and stops after reaching the predetermined height; B2. The cable reel starts to rotate and reaches the specified speed through the feedback of the speed sensor; B3. The unhooking device is released, the cable-spinning system clutch is disengaged, and the arresting hook system is caught on the cable and impacts. B4. The lifting system lowers the unhooking device and closes it after contacting the suspended platform; B5. The lifting system raises the suspended platform to the next designated height.

8. The method for repeated testing of the arresting hook according to claim 5, characterized in that, The switching process between arresting hook-contact collision tests and cable-operated impact tests includes the following steps: C1. Stop the operation of all motors in the turntable system and cable system; C2. When the suspended platform is raised to a safe height, the turntable collision subsystem and the cable restraint subsystem on the pit slide rail are switched by switching the actuating cylinder, thereby realizing the rapid switching between the turntable collision subsystem and the cable restraint subsystem.

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