A free fall test system and method

Abstract

The present invention relates to the field of fall test, and discloses a free fall test system and method, including a column, a first frame fixedly connected to the lower part of the column, a first railing welded to the upper end of the first frame, a second frame fixedly connected to the middle part of the column, a second railing fixedly connected to the upper end of the second frame, and a drive assembly fixedly connected to the upper end of the second frame. The high-pressure oil pipe pressure plug has the advantages of adjustable height and diversified scene simulation. The column, the first frame, the second frame, etc. constitute a stable structural foundation, wherein the drive assembly and the moving rod cooperate, and the control center can drive the first motor to drive the screw rod, so that the moving seat moves along the slide rail, thereby flexibly adjusting the position of the blocking rod, and can simulate different falling scene obstacles or protective structures, so that the test is more realistic. In addition, the limit card seat and its limit groove can be used for rope limit, which reduces the shaking of the dummy assembly during the lifting process and significantly improves the test accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of drop testing, and in particular to a free drop testing system and method. Background Art

[0002] In many fields of modern society, the study and testing of free fall phenomena are of vital importance. In the construction industry, falling objects from heights are extremely dangerous. Whether it is the accidental fall of construction materials or tools, it may cause serious damage to people and facilities on the ground. Therefore, it is necessary to have a deep understanding of the characteristics of free fall objects to formulate effective protective measures. In high-altitude operations and amusement facility scenarios, the risk of accidental fall of personnel or equipment components cannot be ignored. For example, the safety of staff cleaning the exterior walls of high-rise buildings and the safe design of Ferris wheel cabins all rely on accurate analysis of free fall-related situations.

[0003] At present, there are obvious deficiencies in the technologies related to free fall testing. In terms of simulating fall scenarios, most existing test systems have poor flexibility and can only perform simple, single-mode fall tests. They are unable to effectively simulate complex and changeable actual environments. For example, it is difficult to accurately simulate obstacles of different shapes and positions, as well as the impact of diverse protective structures on falling objects. This causes a large deviation between the test results and the fall conditions in real scenarios, and cannot provide a comprehensive and accurate reference for safety protection design.

[0004] Previous test systems also had problems with operational convenience and safety. Operators often faced many difficulties when preparing for testing and debugging equipment, and it was difficult to easily reach key locations for operation. Moreover, during the test process, due to the lack of complete protective measures and a stable equipment structure, safety accidents were prone to occur, posing a potential threat to personnel and the surrounding environment. Therefore, a free fall test system and method were proposed to meet the requirements of convenient operation, safety and reliability.

[0005] Chinese patent publication number CN215115662U discloses a comprehensive testing system for fall protection equipment. This comprehensive testing system for fall protection equipment, through reasonable planning of limited space, rationally integrates various test equipment for fall protection equipment into a frame structure, and can perform various performance tests on various fall protection equipment, thereby simplifying and facilitating test operations, reducing the complexity of the test system, and reducing the footprint of the test equipment. However, this comprehensive testing system for fall protection equipment has poor safety, and workers cannot climb onto the frame to perform test deployment. It has low accuracy and cannot realize a variety of different mounting and release combinations according to different test requirements. The flexibility and versatility of the test system are relatively low. Summary of the Invention

[0006] In view of the problems existing in the measurement accuracy and safety of existing free fall test schemes, the purpose of the present invention is to provide a free fall test system and method, thereby improving the accuracy and safety of free fall tests.

[0007] In order to achieve the above objectives, the present invention provides a free fall test system and method, including a column, a first frame fixedly connected to the lower portion of the column, a first railing welded to the upper end of the first frame, a second frame fixedly connected to the middle portion of the column, a second railing fixedly connected to the upper end of the second frame, a drive assembly fixedly connected to the upper end of the second frame, a moving rod provided at the upper end of the drive assembly, a top seat fixedly connected to the upper end of the column, a first operating platform provided between the first and second frames, a notch provided on the side of the first operating platform close to the center of the column, a second operating platform provided above the second frame, a first release assembly fixedly connected to the upper end of the second operating platform, an outer ladder welded to the right side of the column, a first hoisting assembly and a second hoisting assembly fixedly connected to the lower end of the top seat, a second release assembly provided at the lower end of each of the first and second hoisting assemblies, a dummy assembly mounted at the lower end of the first hoisting assembly, a control center provided on the left side of the column, a pressure sensor fixedly connected to the bottom end of the inner portion of the column, and a protective pad provided at the upper end of the pressure sensor.

[0008] Preferably, the driving assembly includes a first motor, a screw rod and a slide rail, the output end of the first motor is fixedly connected to the screw rod, and the upper end of the second frame is fixedly connected to the screw rod.

[0009] Through the above technical solution, a driving assembly is provided to cooperate with the moving rod to reduce shaking during the lifting and lowering process of the dummy assembly.

[0010] Preferably, the moving rod includes a blocking rod, a moving seat and a limiting card seat, the two ends of the blocking rod are fixedly connected to the moving seat, the end of the moving seat close to the column is fixedly connected to the limiting card seat, and a limiting groove is provided on the inner side of the limiting card seat.

[0011] Through the above technical solution, a moving rod is set up, and the barrier rod can be flexibly adjusted in position by moving the moving seat, effectively simulating obstacles that may be encountered during a fall. The limit card seat and the limit groove inside it can limit the relevant ropes or structures, reducing the shaking during the lifting and lowering of the dummy assembly, improving the accuracy and safety of the test, and at the same time, it can be used as a simulation element of the protective structure in special test scenarios.

[0012] Preferably, the driving components are provided with two identical ones, the movable seat is connected to the screw rod by threads, and the movable seat is connected to the slide rail by sliding.

[0013] Through the above technical solution, the drive assembly can achieve precise and stable linear motion control by utilizing the threaded connection between the lead screw and the movable seat and the sliding connection between the movable seat and the slide rail.

[0014] Preferably, the first hoisting assembly includes a winch, a fixed pulley, a tension sensor and a safety hook. The winch is fixedly installed at the lower end of the top seat, the lower end of the top seat is fixedly connected to the fixed pulley, the rope of the winch is fixedly connected to the top of the tension sensor, and the bottom end of the tension sensor is fixedly connected to the safety hook.

[0015] Through the above technical solution, the winch serves as the lifting power and changes the direction of the rope through the fixed pulley, which can stably lift the dummy assembly. The setting of the tension sensor can accurately measure the rope tension in real time, so that the process of lifting and releasing the dummy assembly can be precisely controlled and monitored, ensuring the safety of the test process and the accuracy of data collection, and helping to analyze the force exerted by the dummy assembly on the lifting system at different stages.

[0016] Preferably, the second release assembly includes a box body, a groove, a second motor, a first gear, a second gear, a screw, a placement groove, a square groove, a release tube and a half groove. A groove is provided inside the box body, the bottom end of the inner wall of the groove is fixedly connected to the second motor, the output end of the second motor is fixedly connected to the first gear, the second gear is rotatably connected inside the groove, a placement groove is provided at the lower end of the box body, the end of the second gear close to the placement groove is fixedly connected to the screw, a square groove is provided on the inner wall of the placement groove close to the second gear, a release tube is provided inside the square groove, and a half groove is provided at the upper end of the release tube.

[0017] This technical solution incorporates a second release assembly. A second motor drives the first gear, which in turn drives the meshing second gear and the screw. The threaded connection between the screw and the release tube, the tube's sliding motion within the square slot, and the tube's half-slot design enable precise control of the release of the mounted object. This design accurately controls the release timing and method of the dummy assembly based on test requirements, ensuring consistent starting conditions for each test and improving the reliability and repeatability of test results.

[0018] Preferably, the first hoisting assembly and the second hoisting assembly have the same structure, the first release assembly and the second release assembly have the same structure, the first gear and the second gear are meshingly connected, the screw and the release tube are threadedly connected, and the release tube and the square groove are slidingly connected.

[0019] Through the above technical solution, the first release component and the second release component have the same structure, and a variety of different mounting and release combinations can be achieved during the test process, which increases the flexibility and versatility of the test system and can meet the needs of more complex free fall test scenarios.

[0020] Preferably, the height of the column is 12m~12.5mm, the outer ladder is connected to the first operating platform and the second operating platform, the control center is electrically connected to the drive component, the first release component, the first hoisting component, the second hoisting component, the second release component, and the pressure sensor, and the control center includes a control host and a display screen.

[0021] Through the above technical solution, the column height meets the height requirements of most free-fall test scenarios. The external ladder is connected to the first and second operating platforms, making it easy for operators to reach the corresponding positions for inspection, debugging, and operation. The control center is electrically connected to each key component, centrally controlling the operation of the drive assembly, release assembly, and hoist assembly, and receiving data from pressure sensors and tension sensors. This enables automated control and data acquisition and analysis, improving test efficiency and data processing accuracy. The control center's display screen can intuitively display test data, allowing operators to monitor test status in real time.

[0022] In order to achieve the above object, the present invention provides a testing method for a free fall test system, comprising the following steps:

[0023] S1: Before the test, the control center activates the first and second hoisting assemblies to raise the dummy assembly to the appropriate height. At the same time, check that all components are functioning properly, including the drive assembly, first release assembly, second release assembly, and pressure sensor, and ensure that the electrical connections in the control center are stable.

[0024] S2: The operator reaches the first or second operating platform via an external ladder and uses the gap in the first operating platform to further inspect and debug the components inside the column, such as the moving rod and the drive assembly. Based on the test requirements, the operator controls the second release assembly through the control center, and the second motor starts, driving the first gear to rotate. The second gear meshing with the first gear also rotates, so that the screw fixed to the second gear is threadedly connected to the release tube during the rotation process. The release tube slides in the square groove. Through the half-groove design, the object mounted on the first hoist assembly or the second hoist assembly can be controlled and released.

[0025] S3: The first motor in the drive assembly is started in the control center. The first motor drives the screw to rotate, causing the movable seat, which is threadedly connected to the screw and slidably connected to the slide rail, to move. This in turn drives the stop bar to adjust to the appropriate position to simulate different fall scenarios, obstacles, or protective structures, and other related test conditions. The stop bar also serves as a limit structure during the lifting process. The limit clamp is used to limit the rope of the hoisting dummy assembly to reduce shaking.

[0026] S4: When everything is ready, the control center controls the second release assembly to release the dummy assembly, causing it to fall freely. During the fall, the dummy assembly passes through areas such as the second operating platform and the first operating platform;

[0027] S5: When the dummy assembly falls onto the pressure sensor at the bottom of the column, the pressure sensor measures the impact pressure data in real time and transmits the data back to the control center;

[0028] S6: Throughout the entire process, the tension sensor monitors the rope tension data in real time and transmits the data to the control center. The control center records and analyzes various data throughout the fall process, including the height of the dummy component falling, the speed change can be obtained through relevant calculations, and the data of the tension sensor and pressure sensor;

[0029] S7: After completing a test, lift the dummy assembly again using the first hoist assembly or the second hoist assembly. Adjust test parameters as needed, such as the position of the moving rod and the release conditions of the release assembly. Repeat the above steps for multiple tests to obtain more comprehensive and accurate free fall test data.

[0030] S8: According to the test requirements, the staff can mount the dummy components on the first release components of the first operating platform and the second operating platform to achieve a free fall test at a fixed height.

[0031] Compared with the existing technology, the free fall test solution provided by the present invention has the following beneficial effects:

[0032] 1. The present invention offers the advantages of height adjustability and diverse scenario simulations. The columns, first frame, and second frame form a stable structural foundation. The drive assembly and the movable rod cooperate, enabling the control center to drive the first motor to drive the screw, causing the movable seat to move along the slide rail, thereby flexibly adjusting the position of the barrier rod. This allows for simulation of various fall scenarios, obstacles, or protective structures, making the test more realistic. Furthermore, the limit card holder and its limit slot can be used for rope limit, reducing the shaking of the dummy assembly during the lifting process and significantly improving test accuracy.

[0033] 2. The present invention possesses a precise release control mechanism. The first and second release assemblies have identical structures. The housing, groove, second motor, first gear, second gear, screw, placement slot, square slot, release tube, and half-slot in the second release assembly work in tandem. The second motor is activated, driving the first gear, which in turn drives the second gear and screw. The threaded connection between the screw and the release tube, and the sliding movement of the release tube within the square slot, combined with the half-slot design, enables precise and controlled release of the dummy assembly, ensuring consistent starting conditions for each test while increasing test flexibility and repeatability.

[0034] 3. In this solution, the winch, fixed pulley, tension sensor, and safety hook in the first hoisting assembly work together. The tension sensor can monitor rope tension data in real time. Simultaneously, the pressure sensor at the bottom of the column can accurately measure the impact pressure data when the dummy assembly falls. The control center is electrically connected to each component and can receive, record, and analyze various data, including the dummy assembly's falling height and speed changes. This provides rich and accurate data support for comprehensive free fall assessments.

[0035] 4. The solution of the present invention has good convenience and safety. The outer ladder is connected to the first operating platform and the second operating platform, which makes it convenient for operators to reach the first operating platform or the second operating platform through the outer ladder. The gap in the first operating platform can be used to perform test operations on the second operating platform. The structural design of the system ensures the safety of the dummy components during lifting, releasing and falling. For example, the protective structures such as the first railing and the second railing and the stable connection of each component prevent accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the first-person perspective structure of the free fall test system provided by the present invention;

[0037] Figure 2 A schematic diagram of the second perspective stereoscopic structure of the free fall test system provided by the present invention;

[0038] Figure 3 A schematic diagram of the third-perspective three-dimensional structure of the free fall test system provided by the present invention;

[0039] Figure 4 A schematic diagram of the fourth perspective structure of the free fall test system provided by the present invention;

[0040] Figure 5 A schematic diagram of the fifth perspective structure of the free fall test system provided by the present invention;

[0041] Figure 6 A schematic diagram of the sixth perspective structure of the free fall test system provided by the present invention;

[0042] Figure 7 This is a schematic diagram of the disassembled structure of the drive assembly and the moving rod in the free fall test system provided by the present invention;

[0043] Figure 8 This is a schematic diagram of the enlarged structure of the first hoisting component in the free fall test system provided by the present invention;

[0044] Figure 9 This is a schematic diagram of the disassembled structure of the second release component in the free fall test system provided by the present invention.

[0045] Wherein: 1. Column; 2. First frame; 3. First railing; 4. Second frame; 5. Second railing; 6. Drive assembly; 601. First motor; 602. Screw; 603. Slide rail; 7. Moving rod; 701. Stop rod; 702. Moving seat; 703. Positioning bracket; 8. Top seat; 9. First operating platform; 10. Notch; 11. Second operating platform; 12. First release assembly; 13. External ladder; 14. First hoist assembly; 1401. Winch; 1402 , fixed pulley; 1403, tension sensor; 1404, safety hook; 15, second hoisting assembly; 16, second release assembly; 1601, box body; 1602, groove; 1603, second motor; 1604, first gear; 1605, second gear; 1606, screw; 1607, placement slot; 1608, square slot; 1609, release tube; 1610, half slot; 17, dummy assembly; 18, control center; 19, pressure sensor; 20, protective pad. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Example 1:

[0048] like Figure 1-6 As shown, the free fall test system provided by the present invention includes a column 1, a first frame 2 is fixedly connected to the lower part of the column 1, a first railing 3 is welded to the upper end of the first frame 2, a second frame 4 is fixedly connected to the middle part of the column 1, a second railing 5 is fixedly connected to the upper end of the second frame 4, a driving assembly 6 is fixedly connected to the upper end of the second frame 4, a moving rod 7 is provided at the upper end of the driving assembly 6, a top seat 8 is fixedly connected to the upper end of the column 1, a first operating platform 9 is provided between the first frame 2 and the second frame 4, and a notch 10 is opened on the side of the first operating platform 9 close to the center of the column 1. A second operating platform 11 is provided above the second frame 4, and a first releasing assembly 12 is fixedly connected to the upper end of the second operating platform 11. An outer ladder 13 is welded to the right side of the column 1, and a first hoisting assembly 14 and a second hoisting assembly 15 are fixedly connected to the lower end of the top seat 8. The lower ends of the first hoisting assembly 14 and the second hoisting assembly 15 are both provided with a second releasing assembly 16. A dummy assembly 17 is mounted on the lower end of the first hoisting assembly 14, and a control center 18 is provided on the left side of the column 1. A pressure sensor 19 is fixedly connected to the bottom end of the column 1, and a protective pad 20 is provided on the upper end of the pressure sensor 19.

[0049] See also Figure 7In some embodiments of this example, the drive assembly 6 in the system includes a first motor 601, a screw 602, and a slide rail 603. The output end of the first motor 601 is fixedly connected to the screw 602, and the upper end of the second frame 4 is fixedly connected to the screw 602.

[0050] In this system, the driving assembly 6 based on the above structure cooperates with the moving rod 7 to reduce the shaking of the dummy assembly 17 during the lifting and lowering process.

[0051] See also Figure 7 In some embodiments of this example, the movable rod 7 in the system includes a stopper 701, a movable seat 702, and a position limiting seat 703. The stopper 701 is fixedly connected to the movable seat 702 at both ends, and the end of the movable seat 702 close to the column 1 is fixedly connected to the position limiting seat 703. The position limiting seat 703 has a position limiting groove defined inside.

[0052] In this system, the movable rod 7 based on the above structure and the blocking rod 701 can flexibly adjust their positions by moving the movable seat 702, effectively simulating obstacles that may be encountered during a fall. The limiting seat 703 and the limiting groove inside it can limit the relevant ropes or structures, reduce the shaking during the lifting and lowering of the dummy assembly 17, improve the accuracy and safety of the test, and at the same time, can be used as a simulation element of the protective structure in special test scenarios.

[0053] Furthermore, in a specific implementation of the system, the drive assembly 6 is provided with two identical components: the movable base 702 is threadedly connected to the screw rod 602, and the movable base 702 is slidably connected to the slide rail 603. Advantageously, the drive assembly 6 can achieve precise and stable linear motion control by utilizing the threaded connection between the screw rod 602 and the movable base 702, and the slidable connection between the movable base 702 and the slide rail 603.

[0054] Example 2:

[0055] This example further provides a specific optimization solution based on the solution in embodiment 1.

[0056] Further integration Figure 8 As shown, the specific structure of the first hoisting component 14 is given in this example.

[0057] As shown in the figure, the first hoisting assembly 14 specifically includes a winch 1401, a fixed pulley 1402, a tension sensor 1403, and a safety hook 1404. The winch 1401 is fixedly mounted on the lower end of the top base 8, which is fixedly connected to the fixed pulley 1402. The rope of the winch 1401 is fixedly connected to the top of the tension sensor 1403, and the bottom of the tension sensor 1403 is fixedly connected to the safety hook 1404.

[0058] In the first hoisting assembly 14 configured in this way, the winch 1401 serves as the lifting power, and changes the direction of the rope through the fixed pulley 1402, so as to stably lift the dummy assembly 17. The setting of the tension sensor 1403 can accurately measure the rope tension in real time, so that the process of lifting and releasing the dummy assembly 17 can be accurately controlled and monitored, ensuring the safety of the test process and the accuracy of data collection, and helping to analyze the force exerted by the dummy assembly 17 on the lifting system at different stages.

[0059] Further integration Figure 8 As shown, the specific structure of the second release component 16 is also given in this example.

[0060] As shown in the figure, the second release assembly 16 specifically includes a box body 1601, a groove 1602, a second motor 1603, a first gear 1604, a second gear 1605, a screw 1606, a placement groove 1607, a square groove 1608, a release tube 1609 and a half groove 1610.

[0061] Among them, a groove 1602 is opened inside the box body 1601, and the bottom end of the inner wall of the groove 1602 is fixedly connected to the second motor 1603, and the output end of the second motor 1603 is fixedly connected to the first gear 1604. The second gear 1605 is rotatably connected inside the groove 1602, and a placement groove 1607 is opened at the lower end of the box body 1601. The end of the second gear 1605 close to the placement groove 1607 is fixedly connected to the screw 1606, and a square groove 1608 is opened on the side of the inner wall of the placement groove 1607 close to the second gear 1605. A release tube 1609 is arranged inside the square groove 1608, and a half groove 1610 is opened at the upper end of the release tube 1609.

[0062] In this configuration of the second release assembly 16, the second motor 1603 drives the first gear 1604 to rotate, which in turn drives the meshed second gear 1605 and screw 1606. The threaded connection between screw 1606 and release tube 1609, the sliding movement of release tube 1609 within square groove 1608, and the design of half-slot 1610 in release tube 1609 enable precise control of the release of the mounted object. This design accurately controls the release timing and method of the dummy assembly 17 according to test requirements, ensuring consistent starting conditions for each test and improving the reliability and repeatability of test results.

[0063] Furthermore, in this example, the first hoist assembly 14 and the second hoist assembly 15 have the same structure, and the first release assembly 12 and the second release assembly 16 have the same structure. The first gear 1604 and the second gear 1605 are meshed, the screw 1606 and the release tube 1609 are threaded, and the release tube 1609 and the square groove 1608 are slidably connected. The same structure of the first release assembly 12 and the second release assembly 16 allows for a variety of different mounting and release combinations during testing, increasing the flexibility and versatility of the test system and meeting the requirements of more complex free fall test scenarios.

[0064] Example 3:

[0065] This example further improves upon the solutions in Example 1 and Example 2 to create a specific optimization solution.

[0066] Combine Figure 7-9 As shown, for the solutions of Example 1 and Example 2, in this example, the height of the column 1 is set to 12m~12.5mm, and the outer ladder 13 is connected to the first operating platform 9 and the second operating platform 11. The control center 18 is electrically connected to the drive component 6, the first release component 12, the first hoisting component 14, the second hoisting component 15, the second release component 16, and the pressure sensor 19. The control center 18 includes a control host and a display screen.

[0067] With this arrangement, the height of the column 1 meets the height requirements of most free-fall test scenarios. The outer ladder 13 is connected to the first operating platform 9 and the second operating platform 11, making it convenient for operators to reach the corresponding positions for inspection, debugging, and operation. The control center 18 is electrically connected to each key component and can centrally control the operation of the drive component 6, release component, hoisting component, etc., and receive data from the pressure sensor 19 and tension sensor 1403, realizing automated control and data acquisition and analysis functions, improving test efficiency and data processing accuracy, while controlling.

[0068] For the free fall test system formed by the above example solution, the specific test process is further given:

[0069] Combine Figures 1 to 9 , the testing process based on this free fall test system is as follows:

[0070] Before the test, the first hoisting assembly 14 and the second hoisting assembly 15 are started through the control center 18 to lift the dummy assembly 17 to an appropriate height. At the same time, each component is checked for normal operation, including the drive assembly 6, the first release assembly 12, the second release assembly 16, the pressure sensor 19, etc., to ensure that the electrical connection of the control center 18 is stable; the operator reaches the first operating platform 9 or the second operating platform 11 through the external ladder 13, and uses the notch 10 of the first operating platform 9 to further inspect and debug the moving rod 7, the drive assembly 6 and other components located inside the column 1.

[0071] Then, according to the test requirements, the second release component 16 is controlled by the control center 18, and the second motor 1603 is started, driving the first gear 1604 to rotate, and the second gear 1605 engaged with the first gear 1604 rotates accordingly, so that the screw 1606 fixedly connected to the second gear 1605 is threadedly connected to the release tube 1609 during the rotation process, and the release tube 1609 slides in the square groove 1608. Through the design of the half groove 1610, the controllable release of the object mounted on the first hoisting component 14 or the second hoisting component 15 is achieved.

[0072] In the control center 18, the first motor 601 in the drive assembly 6 is started, and the first motor 601 drives the screw rod 602 to rotate, so that the movable seat 702 threadedly connected to the screw rod 602 and slidingly connected to the slide rail 603 moves, and then drives the baffle 701 to adjust to a suitable position, which is used to simulate different falling scenarios, obstacles or protective structures and other related test conditions. The baffle 701 can also be used as a limiting structure during the lifting process, and the limiting bracket 703 is used to limit the rope of the hoisting dummy assembly 17 to reduce shaking.

[0073] When everything is ready, the control center 18 controls the second release assembly 16 to release the dummy assembly 17, allowing it to fall freely. During the falling process, the dummy assembly 17 passes through the second operating platform 11, the first operating platform 9 and other areas; when the dummy assembly 17 falls onto the pressure sensor 19 at the bottom of the column 1, the pressure sensor 19 measures the impact pressure data in real time and transmits the data back to the control center 18; during the whole process, the tension sensor 1403 monitors the rope tension data in real time and transmits the data to the control center 18. The control center 18 records and analyzes various data during the entire falling process, including the falling height of the dummy assembly 17, the speed change can be obtained through relevant calculations, and the data of the tension sensor 1403 and the pressure sensor 19.

[0074] Then, after completing a test, the dummy assembly 17 is lifted again by the first hoisting assembly 14 or the second hoisting assembly 15, and the test parameters are adjusted as needed, such as the position of the moving rod 7, the release conditions of the release assembly, etc., and the above steps are repeated to perform multiple tests to obtain more comprehensive and accurate free fall test data; according to the test requirements, the staff can mount the dummy assembly 17 on the first release assembly 12 of the first operating platform 9 and the second operating platform 11 to realize the free fall test at a fixed height.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A free fall test system, comprising a column (1), characterized in that: The lower part of the column (1) is fixedly connected to a first frame (2), the upper end of the first frame (2) is welded to a first railing (3), the middle part of the column (1) is fixedly connected to a second frame (4), the upper end of the second frame (4) is fixedly connected to a second railing (5), the upper end of the second frame (4) is fixedly connected to a driving assembly (6), the upper end of the driving assembly (6) is provided with a moving rod (7), the upper end of the column (1) is fixedly connected to a top seat (8), a first operating platform (9) is provided between the first frame (2) and the second frame (4), a notch (10) is provided on one side of the first operating platform (9) close to the center of the column (1), and a A second operating platform (11), wherein the upper end of the second operating platform (11) is fixedly connected to a first release component (12), an outer ladder (13) is welded to the right side of the column (1), a first hoisting component (14) and a second hoisting component (15) are fixedly connected to the lower end of the top seat (8), a second release component (16) is arranged at the lower end of each of the first hoisting component (14) and the second hoisting component (15), a dummy component (17) is mounted at the lower end of the first hoisting component (14), a control center (18) is arranged on the left side of the column (1), a pressure sensor (19) is fixedly connected to the bottom end of the column (1), and a protective pad (20) is arranged at the upper end of the pressure sensor (19).

2. A free fall test system according to claim 1, characterized in that: The driving assembly (6) comprises a first motor (601), a screw rod (602) and a slide rail (603); the output end of the first motor (601) is fixedly connected to the screw rod (602); and the upper end of the second frame (4) is fixedly connected to the screw rod (602).

3. A free fall test system according to claim 2, characterized in that: The moving rod (7) comprises a stop rod (701), a moving seat (702) and a limit clamping seat (703); both ends of the stop rod (701) are fixedly connected to the moving seat (702); one end of the moving seat (702) close to the column (1) is fixedly connected to the limit clamping seat (703); and a limit groove is provided on the inner side of the limit clamping seat (703).

4. A free fall test system according to claim 3, characterized in that: The driving assembly (6) is provided with two identical ones, the moving seat (702) is threadedly connected to the screw rod (602), and the moving seat (702) is slidably connected to the slide rail (603).

5. A free fall test system according to claim 4, characterized in that: The first hoisting assembly (14) comprises a winch (1401), a fixed pulley (1402), a tension sensor (1403) and a safety hook (1404); the winch (1401) is fixedly mounted on the lower end of the top seat (8); the lower end of the top seat (8) is fixedly connected to the fixed pulley (1402); the rope of the winch (1401) is fixedly connected to the top end of the tension sensor (1403); and the bottom end of the tension sensor (1403) is fixedly connected to the safety hook (1404).

6. A free fall test system according to claim 1, characterized in that: The second release assembly (16) comprises a box body (1601), a groove (1602), a second motor (1603), a first gear (1604), a second gear (1605), a screw (1606), a placement groove (1607), a square groove (1608), a release tube (1609) and a half groove (1610). The box body (1601) is provided with a groove (1602) inside, the bottom end of the inner wall of the groove (1602) is fixedly connected to the second motor (1603), and the output end of the second motor (1603) is fixedly connected to the first gear. (1604), a second gear (1605) is rotatably connected inside the groove (1602), a placement groove (1607) is provided at the lower end of the box body (1601), a screw (1606) is fixedly connected to one end of the second gear (1605) close to the placement groove (1607), a square groove (1608) is provided on the inner wall of the placement groove (1607) close to the second gear (1605), a release tube (1609) is provided inside the square groove (1608), and a half groove (1610) is provided at the upper end of the release tube (1609).

7. A free fall test system according to claim 6, characterized in that: The first hoisting component (14) and the second hoisting component (15) have the same structure, the first releasing component (12) and the second releasing component (16) have the same structure, the first gear (1604) and the second gear (1605) are meshingly connected, the screw rod (1606) and the release tube (1609) are threadedly connected, and the release tube (1609) and the square groove (1608) are slidingly connected.

8. A free fall test system according to claim 1, characterized in that: The height of the column (1) is 12m-12.5mm, the outer ladder (13) is connected to the first operating platform (9) and the second operating platform (11), the control center (18) is electrically connected to the driving component (6), the first releasing component (12), the first hoisting component (14), the second hoisting component (15), the second releasing component (16), and the pressure sensor (19), and the control center (18) includes a control host and a display screen.

9. A free fall test system according to any one of claims 1 to 8, characterized in that: The test method is as follows: The following steps are involved: S1: Before the test, the control center (18) starts the first hoisting assembly (14) and the second hoisting assembly (15) to lift the dummy assembly (17) to a suitable height, and at the same time checks whether all components are operating normally, including the drive assembly (6), the first release assembly (12), the second release assembly (16), the pressure sensor (19), etc., to ensure that the electrical connection of the control center (18) is stable; S2: The operator reaches the first operating platform (9) or the second operating platform (11) through the outer ladder (13), and uses the notch (10) of the first operating platform (9) to further inspect and debug the components located inside the column (1), such as the moving rod (7) and the driving assembly (6). According to the test requirements, the second release assembly (16) is controlled by the control center (18), and the second motor (1603) is started, driving the first gear (1604) to rotate, and the second gear (1605) meshing with the first gear (1604) rotates accordingly, so that the screw rod (1606) fixedly connected to the second gear (1605) is threadedly connected to the release tube (1609) during the rotation process, and the release tube (1609) slides in the square groove (1608). Through the design of the half groove (1610), the controllable release of the object mounted on the first hoisting assembly (14) or the second hoisting assembly (15) is achieved; S3: The first motor (601) in the operating drive assembly (6) is started at the control center (18), and the first motor (601) drives the screw rod (602) to rotate, so that the moving seat (702) threadedly connected to the screw rod (602) and slidably connected to the slide rail (603) moves, thereby driving the blocking rod (701) to adjust to a suitable position, so as to simulate different falling scenes, obstacles or protective structures and other related test conditions. The blocking rod (701) can also be used as a limiting structure during the lifting process, and the limiting clamping seat (703) is used to limit the rope of the hoisting dummy assembly (17) to reduce shaking; S4: When everything is ready, the control center (18) controls the second release assembly (16) to release the dummy assembly (17) so that it falls freely. During the falling process, the dummy assembly (17) passes through the second operating platform (11), the first operating platform (9) and other areas; S5: When the dummy assembly (17) falls onto the pressure sensor (19) at the bottom of the column (1), the pressure sensor (19) measures the impact pressure data in real time and transmits the data back to the control center (18); S6: During the whole process, the tension sensor (1403) monitors the rope tension data in real time and transmits the data to the control center (18). The control center (18) records and analyzes various data during the whole falling process, including the falling height of the dummy assembly (17), the speed change (which can be obtained through relevant calculations), the data of the tension sensor (1403) and the pressure sensor (19), etc.; S7: After completing a test, the dummy assembly (17) is lifted again by the first hoisting assembly (14) or the second hoisting assembly (15), and the test parameters such as the position of the moving rod (7) and the release conditions of the release assembly are adjusted as needed. The above steps are repeated to perform multiple tests to obtain more comprehensive and accurate free fall test data; S8: According to the test requirements, the staff can mount the dummy assembly (17) on the first release assembly (12) of the first operating platform (9) and the second operating platform (11) to achieve a free fall test at a fixed height.

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