A bicycle frame impact testing machine

Abstract

This invention discloses a bicycle frame impact testing machine, relating to the technical field of frame testing devices, including a test frame and a platform; characterized in that it further includes: a traction component, disposed on the top of the test frame, the traction component having a retractable sling for lifting or releasing the load; and a lifting frame, movably connected to the inner side of the test frame and capable of moving up and down along it, with a first iron block fixedly connected to the top of the lifting frame. This invention integrates two test modes—drop load and frame drop—into a single device, utilizing the same test frame, platform, traction component, and clamping and tilting system. By simply switching the sling connection and adjusting the device's operating state, two impact tests specified by national standards can be performed separately. This fundamentally solves the systemic defects of existing technologies, such as large space occupation, redundant operation procedures, and inconsistent test standards caused by two independent devices, achieving a high degree of resource efficiency and reducing the space occupied by the device.

Description

Technical Field

[0001] This invention relates to the field of frame testing equipment technology, specifically to a bicycle frame impact testing machine. Background Technology

[0002] The bicycle frame impact test simulates extreme conditions that may be encountered during riding, such as bumps, falls, or collisions. It is a core testing item that scientifically quantifies the impact resistance of the frame and evaluates its structural safety and reliability. This test is directly related to the personal safety of riders and the service life of the product, and is a key link in bicycle quality certification.

[0003] According to GB / T3565.6-2022 Bicycle Safety Requirements Part 6: Test Methods for Frames and Forks, the impact strength test for bicycle frames and forks mainly includes two core tests: the first is the drop test (hammer impact), which involves lifting and releasing a hammer of a specified mass, allowing it to fall freely and strike the fixed frame / fork assembly to simulate the condition of the front wheel hitting an obstacle; the second is the frame drop test, which involves lifting and releasing one end of the entire frame / fork assembly, allowing it to fall freely and strike a rigid anvil to simulate the extreme condition of the rider and bicycle tilting forward and tipping over during riding. These two tests assess the dynamic impact strength and structural integrity of the frame from different mechanical perspectives and are mandatory testing items for evaluating bicycle safety.

[0004] Currently, for the two independent testing standards mentioned above, the industry generally adopts separate, single-function dedicated testing equipment; that is, the drop weight tester and the frame drop tester are two completely independent devices. This separate equipment configuration has significant drawbacks: First, it requires testing institutions or manufacturers to repeatedly invest in two large sets of equipment, resulting in high purchase costs, floor space requirements, and subsequent maintenance costs. Second, during testing, operators need to transfer and re-clamp test samples between the two devices, a cumbersome process with low testing efficiency. Furthermore, multiple clamping inevitably introduces positioning errors, affecting the consistency and comparability of test data. Finally, the management, operation training, and data archiving of the separate equipment all need to be conducted independently, increasing the complexity of quality system management. In addition, the difficulty in integrating the two lies not only in overcoming their respective technical barriers but also in ensuring that the single test can be adapted to different frame models to improve its practicality. Summary of the Invention

[0005] The purpose of this invention is to provide a bicycle frame impact testing machine that integrates two testing modes, drop weight and frame drop, into one device. This solves the problems of high cost, low efficiency, and inconsistent testing standards that exist with separate devices, and significantly improves testing efficiency and result accuracy.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A bicycle frame impact testing machine includes a test frame and a platform; it also includes: a traction assembly disposed on the top of the test frame, the traction assembly having a retractable sling for lifting or releasing a load; a lifting frame movably connected to the inner side of the test frame and capable of moving up and down thereal, a first iron block fixedly connected to the top of the lifting frame, a first electromagnet fixedly connected to the bottom of the sling, the first electromagnet cooperating with the first iron block, and a counterweight fixedly connected to the bottom of the lifting frame; a support block fixedly connected to the top of the platform; a clamping assembly rotatably connected to the inner side of the platform for clamping the rear axle of the bicycle frame; a positioning assembly disposed on the platform for cooperating with the clamping assembly to fix the bicycle frame; a tilting motor, the output end of which is disengaged from the clamping assembly via a clutch assembly for driving the clamped frame to tilt to a predetermined angle; the clutch assembly controlling the connection and disconnection of power between the tilting motor and the clamping assembly; and an anvil disposed on the top of the platform and located below the tilting trajectory of the clamping assembly.

[0008] By adopting the above technical solution, the two test modes of drop weight and frame drop are integrated into one device. Using the same test frame, platform, traction component and clamping and tilting system, the two impact tests specified by national standards can be performed separately by simply switching the connection object of the sling and adjusting the working state of the device. This fundamentally solves the systemic defects of the existing technology, such as large space occupation, high capital investment, redundant operation process and inconsistent test standards caused by two independent devices, and achieves a high degree of intensive use of equipment resources.

[0009] A further improvement of the technical solution of the present invention is as follows: the clutch assembly includes a control box fixedly connected to the top of the platform, a slide rod fixedly connected inside the control box, a slide plate slidably connected outside the slide rod, a rotating rod rotatably connected on the slide plate, a through hole opened on the control box, one end of the rotating rod extending through the through hole to the outside of the control box, and the other end fixedly connected to a first spline shaft; a drive shaft rotatably connected to the side of the control box away from the through hole, one end of the drive shaft being fixedly connected to the rotating shaft of the clamping assembly, and the other end having a first spline groove, a first spring sleeved on the outside of the slide rod, a second iron block fixedly connected to one side of the slide plate, and a second electromagnet fixedly connected to the side of the control box near the through hole, the second electromagnet cooperating with the second iron block; a worm gear fixedly connected to the outside of the rotating rod, a worm rotatably connected between the inner walls of the control box, the worm meshing with the worm gear, a tilting motor fixedly connected to the outside of the control box, the output end of the tilting motor extending to the inside of the control box and fixedly connected to one end of the worm.

[0010] By adopting the above technical solution, a clutch assembly is set up to achieve a fast and reliable connection and disconnection between the power output end of the tilting motor and the rotating shaft of the clamping assembly. When the frame needs to be tilted at an angle (such as being lifted to a height h2), the clutch assembly reliably engages and transmits torque. When the frame needs to fall freely, the clutch assembly can instantly and completely disengage, completely eliminating any resistance on the motor side that interferes with the free rotation of the frame. This ensures that the frame falls completely freely, strictly conforming to the physical definition of free fall in the national standard, thereby fundamentally guaranteeing the accuracy of the impact energy and the high precision of the test results in the frame drop test.

[0011] A further improvement of the technical solution of the present invention is that: the positioning component includes a first fixing plate fixedly connected to the inner side of the support block, a first screw threadedly connected to the middle of the first fixing plate, the end of the first screw away from its screw head passing through the first fixing plate and rotatably connected to a first clamping rod; a rotating plate is connected to the inner side of the support block through an angle adjustment structure, the angle adjustment structure can adjust the angle of the rotating plate and keep it fixed, a second screw threadedly connected to the rotating plate, the end of the second screw away from its screw head passing through the rotating plate and rotatably connected to a second clamping rod.

[0012] By adopting the above technical solution, an independent positioning component is set up to provide a direct, reliable, and adjustable mechanical locking for the frame when subjected to drop impact. This component replaces the fixing function of the tilting drive system in the drop test, so that the impact force is completely directed to the sturdy platform and test frame, thereby completely isolating the impact load from the risk of damage to the precision drive structure (tilting motor, clutch assembly), protecting the core power unit of the equipment. At the same time, its two-way (vertical and adjustable angle) clamping design ensures that the frame will not undergo any displacement or deflection under huge impact, ensuring the accuracy of the impact force and the repeatability of the test results. It should be noted that by setting up an adjustable angle second clamp, not only is the adaptability of the equipment to frames with different geometries enhanced, but the second clamp can also be retracted during the frame drop test, thereby avoiding any impact on the frame drop test.

[0013] A further improvement of the technical solution of the present invention is as follows: an adjustment groove is provided inside the platform, an adjustment screw is rotatably connected inside the adjustment groove, a slider is threadedly connected to the outside of the adjustment screw, the slider is slidably connected to the adjustment groove, an adjustment motor is fixedly connected to one side of the platform, the output end of the adjustment motor is fixedly connected to the adjustment screw, L-shaped blocks are symmetrically fixedly connected to both sides of the slider, a side plate is fixedly connected between the tops of the two L-shaped blocks, a guide rod is slidably connected to the side plate, a limit block is fixedly connected to one end of the guide rod, the end of the guide rod away from the limit block extends to the other side of the side plate and is fixedly connected to a feedback plate, a third spring is sleeved on the outside of the guide rod and located between the feedback plate and the side plate, and a pressure sensor is installed between the feedback plate and the side plate.

[0014] By adopting the above technical solution and integrating the wheelbase measurement system, the wheelbase measurement before and after the test can be completed automatically and accurately on the testing machine body without disassembling or moving the frame. The system drives the measuring mechanism to move along the frame axis by a motor, uses a high-sensitivity pressure sensor to detect the instantaneous state of contact with the axle, and records the position coordinates by the control system, thereby realizing automatic measurement.

[0015] A further improvement of the technical solution of the present invention is that: the traction assembly includes a traction motor fixedly connected to the top of the test frame, an unwinding frame fixedly connected to the top of the test frame, a wire feeding reel rotatably connected to the inner side of the unwinding frame, the output end of the traction motor fixedly connected to the central axis of the wire feeding reel, a guide wheel rotatably connected to the top of the test frame, and a sling including an upper section and a lower section. The upper section of the sling is wound on the wire feeding reel, the lower section is connected to the first electromagnet, and the upper and lower sections of the sling are connected by an S-shaped weighing sensor.

[0016] By adopting the above technical solution and integrating the traction component with the S-type weighing sensor, two important auxiliary functions are derived while realizing the basic traction function. This significantly improves the equipment's self-calibration, self-measurement capabilities, and test integration. Before the test, the suspended weight can be quickly weighed to ensure that its quality meets national standards, thus guaranteeing the accuracy of the test conditions from the source. After the drop test, the traction system itself can be innovatively used as a high-precision distance measuring tool to automatically detect the position of the front axle of the frame. By comparing it with the reference position recorded before the test, the permanent deformation Δx can be directly calculated, providing an efficient measurement solution and reducing the dependence on external or additional measuring mechanisms.

[0017] A further improvement of the technical solution of the present invention is that: the lifting frame includes four H-shaped frames arranged symmetrically, each H-shaped frame includes two long rods and a short rod fixedly connected between the two long rods, and two rollers are symmetrically rotatably connected between the two long rods. The rollers are all rotatably connected to the uprights of the test frame, and a lifting plate is fixedly connected between the four H-shaped frames.

[0018] By adopting the above technical solution, the combination design of H-shaped frames and rollers transforms sliding friction into rolling friction, greatly reducing the resistance of the lifting frame's vertical movement. This makes the falling process of the hammer closer to the ideal free fall state, ensuring the accuracy of the impact energy from a mechanical perspective. Secondly, the close cooperation between the rollers and the columns ensures that the lifting frame operates smoothly and stably without jamming or shaking, improving the reliability of the equipment. Finally, the four symmetrically distributed H-shaped frames and rollers form a stable four-sided constraint and guiding system, effectively preventing the lifting frame from twisting or tilting during movement, ensuring that the hammer always falls accurately along the vertical track, further improving the repeatability and accuracy of the test.

[0019] A further improvement of the technical solution of the present invention is that: the clamping assembly includes a bidirectional screw rotatably connected to the inner side of the support block, the external thread of the bidirectional screw is connected to an internal thread sleeve, the internal thread sleeve includes a bearing part, an end plate disposed at one end of the bearing part, and an external thread part disposed on the side of the bearing part away from the end plate, the outer wall of the external thread part is threaded, a clamping nut is threadedly connected to the external thread part, and a pressure seat is rotatably connected to one end of the clamping nut.

[0020] By employing the above technical solution, the synergistic effect of outer positioning and inner clamping ensures that the rear axle of the frame will not slip or loosen under impact. During clamping, firstly, based on the width of the rear fork of the frame, the internal threaded sleeve is rotated, causing it to move on the double-ended screw. This drives the two end plates to approach and press against both sides of the rear axle of the frame from the outside, completing the initial centering and outer positioning (since horizontal offset has little impact on the test, only manual judgment of the centering degree is required). Subsequently, the clamping nut is tightened. The nut moves along the outer thread of the internal threaded sleeve, pushing the pressure seat rotatably connected to it towards the axle, firmly pressing against the axle from the inside. This ensures that the axle is ultimately stably constrained within the rigid clamp formed by the end plate (outer side) and the pressure seat (inner side). This clamping force is maintained solely by the clamping nut.

[0021] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0022] 1. This invention integrates two test modes, drop weight and frame drop, into one device. Using the same test frame, platform, traction components, and clamping and tilting system, two impact tests specified by national standards can be performed separately simply by switching the connection objects of the slings and adjusting the working state of the device. This fundamentally solves the systemic defects of existing technologies, such as large space occupation, redundant operation procedures, and inconsistent test standards caused by two independent devices. It achieves a high degree of resource integration and reduces the space occupation of the device.

[0023] 2. This invention achieves rapid and reliable connection and disconnection between the power output end of the flipping motor and the rotating shaft of the clamping assembly by setting a clutch assembly. When performing angular positioning that requires driving the frame to flip (such as lifting to height h2), the clutch assembly reliably engages and transmits torque; when the frame needs to fall freely, the clutch assembly can instantly and completely disengage, completely eliminating any resistance on the motor side that interferes with the free rotation of the frame, ensuring that the frame falls completely freely, strictly conforming to the physical definition of free fall in the national standard, thereby fundamentally guaranteeing the accuracy of the impact energy and the high precision of the test results in the frame drop test.

[0024] 3. This invention provides a direct, reliable, and adjustable mechanical locking for the chassis when subjected to drop impacts by setting up an independent positioning component. This component replaces the fixing function of the tilting drive system in the drop test, ensuring that the impact force is completely directed to the robust platform and test frame. This completely isolates the impact load from the risk of damage to the precision drive structure (tilting motor, clutch assembly), protecting the core power unit of the equipment. At the same time, its two-way (vertical and adjustable angle) clamping design ensures that the chassis will not undergo any displacement or deflection under huge impacts, guaranteeing the accuracy of the impact force and the repeatability of the test results. It should be noted that by setting up an adjustable angle second clamp, not only is the adaptability of the equipment to chassis with different geometries enhanced, but the second clamp can also be retracted during the chassis drop test, thereby avoiding any impact on the chassis drop test.

[0025] 4. This invention adopts the above-mentioned technical solution. By integrating an S-shaped weighing sensor into the traction component, it not only achieves the basic traction function but also derives two important auxiliary functions, significantly improving the equipment's self-calibration, self-measurement capabilities, and test integration. It can quickly weigh the suspended weight before the test to ensure that its quality meets national standards, thus guaranteeing the accuracy of the test conditions from the source. After the drop test, it can innovatively use the traction system itself as a high-precision distance measuring tool to automatically detect the position of the front axle of the frame. By comparing it with the reference position recorded before the test, the permanent deformation can be directly calculated, providing an efficient measurement solution and reducing dependence on external or additional measuring mechanisms.

[0026] 5. This invention, through the combined design of H-shaped frames and rollers, transforms sliding friction into rolling friction, greatly reducing the resistance of the lifting frame's vertical movement. This makes the falling process of the hammer closer to the ideal free fall state, ensuring the accuracy of the impact energy from a mechanical perspective. Secondly, the close cooperation between the rollers and the columns ensures that the lifting frame operates smoothly and stably without jamming or shaking, improving equipment reliability. Finally, the symmetrically distributed four H-shaped frames and rollers form a stable four-sided constraint and guiding system, effectively preventing the lifting frame from twisting or tilting during movement, ensuring that the hammer always falls accurately along the vertical track, further improving the repeatability and accuracy of the test. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0029] Figure 2 This is a schematic diagram of the front view structure during the drop test of this invention;

[0030] Figure 3This is a front view schematic diagram of the frame drop test during the present invention.

[0031] Figure 4 This is a schematic diagram of the positioning component and clutch component of the present invention;

[0032] Figure 5 This is a schematic diagram of the clutch assembly of the present invention;

[0033] Figure 6 This is one of the cross-sectional structural schematic diagrams of the angle adjustment structure of the present invention;

[0034] Figure 7 This is a second cross-sectional schematic diagram of the angle adjustment structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the lifting frame of the present invention;

[0036] Figure 9 This is a schematic diagram of the installation structure of the feedback board of the present invention;

[0037] Figure 10 This is a schematic diagram showing the change in wheelbase during the drop test of this invention;

[0038] Figure 11 This is a schematic diagram showing the wheelbase change during the frame drop test of the present invention;

[0039] Figure 12 For the present invention Figure 4 Enlarged view of point A in the middle.

[0040] In the diagram: 1. Test frame; 2. Platform; 3. Traction assembly; 301. Unwinding frame; 302. Unwinding reel; 303. Traction motor; 304. Guide wheel; 305. Sling; 306. First electromagnet; 307. First iron block; 4. Positioning assembly; 401. First fixing plate; 402. First screw; 403. First clamping rod; 404. Rotating plate; 405. Second screw; 406. Second clamping rod; 41. Angle adjustment structure; 411. Fixing cylinder; 412. First transmission groove; 413. Core column; 414. Second transmission groove; 415. Control lever; 416. Control panel; 417. Transmission column; 418. Second spring; 5. Clutch assembly; 501. Worm gear; 502. Slide rod; 503. Transmission shaft; 504. First spline groove; 505. Rotating rod; 506. 507. First splined shaft; 508. Slide plate; 509. Worm gear; 510. Second electromagnet; 511. Second iron block; 512. First spring; 6. Clamping assembly; 601. Double-acting screw; 602. Compression nut; 603. Pressure seat; 611. Bearing part; 612. End plate; 613. External thread part; 701. Adjusting screw; 702. Adjusting motor; 703. Slider; 704. L-shaped block; 705. Side plate; 706. Guide rod; 707. Limiting block; 708. Third spring; 709. Pressure sensor; 710. Feedback plate; 711. Adjustment groove; 8. Lifting frame; 801. H-shaped frame; 802. Roller; 803. Lifting plate; 9. Counterweight; 10. Support block; 11. Control box; 12. Tilting motor; 13. S-type load cell; 14. Anvil. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the embodiments.

[0042] Example 1

[0043] like Figures 1-12As shown, the present invention provides a bicycle frame impact testing machine, including a test frame 1 and a platform 2; it also includes: a traction assembly 3, disposed on the top of the test frame 1, the traction assembly 3 having a retractable sling 305 for lifting or releasing the load; a lifting frame 8, movably connected to the inner side of the test frame 1 and capable of moving up and down along it, the top of the lifting frame 8 being fixedly connected to a first iron block 307, the bottom of the sling 305 being fixedly connected to a first electromagnet 306, the first electromagnet 306 cooperating with the first iron block 307, the bottom of the lifting frame 8 being fixedly connected to a counterweight 9; and a support block 10, fixedly connected to the platform. The top of platform 2; clamping assembly 6, rotatably connected to the inner side of platform 2, for clamping the rear axle of bicycle frame; positioning assembly 4, set on platform 2, for cooperating with clamping assembly 6 to fix the front fork of bicycle frame, fixed position is the installation position of rear wheel axle of frame; flipping motor 12, the output end of which is disengaged from clamping assembly 6 through clutch assembly 5, for driving the clamped frame to flip to a predetermined angle; clutch assembly 5 is used to control the connection and disconnection of power between flipping motor 12 and clamping assembly 6; anvil block 14, set on top of platform 2 and located below the flipping trajectory of clamping assembly 6.

[0044] In this embodiment, by integrating the two test modes of drop weight and frame drop into one device, and using the same set of test frame 1, platform 2, traction component 3 and clamping and tilting system, the two impact tests specified by national standards can be performed separately by simply switching the connection object of the sling 305 and adjusting the working state of the device. This fundamentally solves the systemic defects of the existing technology, such as large space occupation, high capital investment, redundant operation process and inconsistent test standards caused by two independent devices. It achieves a high degree of intensive use of equipment resources, a significant improvement in testing efficiency and consistency of test data standards.

[0045] The scheme has two test modes: the first impact test mode (drop test) which uses the traction component 3 to pull the weight 9 and release it, and the second impact test mode (frame drop test) which uses the flipping motor 12 to flip the frame to a certain angle and release it.

[0046] like Figure 1 , Figure 2 and Figure 10 As shown, the working principle of the first impact test mode (drop weight test) is as follows:

[0047] Clamping and securing: First, install the frame / fork assembly (with a standard lightweight roller or simulated fork installed at the front end) onto the clamping assembly 6. Start the tilting motor 12, which drives the clamping assembly 6 and the frame together to tilt backward precisely through its output shaft until the frame is adjusted to a vertical state (i.e., the center line of the fork roller is vertically upward). Then, manipulate the positioning assembly 4 to press against the frame, so that it is completely fixed relative to the platform 2 and can no longer rotate around the rear axle.

[0048] Lifting and Measurement of the Weight: The traction assembly 3 releases the sling 305, causing the first electromagnet 306 at the bottom of the sling 305 to descend and connect with the first iron block 307 at the top of the lifting frame 8. The weight 9 is placed on the lifting frame 8 (the total mass of the two is m, which is 22.5 kg according to national standards). The traction motor 303 is then activated, and the lifting frame 8 and the weight 9 are vertically lifted to the specified height h1 according to national standards by winding up the sling 305. During this process, the initial wheelbase x1 can be measured.

[0049] Release and impact: When the hammer 9 is raised to the position, the release mechanism in the traction assembly 3 (such as the corresponding electromagnet being de-energized) causes the first electromagnet 306 to disengage from the first iron block 307. The lifting frame 8 and the hammer 9 fall freely under gravity. The hammer 9 accurately hits the roller on the front fork of the frame to complete the impact. After it stops bouncing, the wheelbase x2 after the impact can be measured and the permanent deformation Δx can be calculated.

[0050] The drop height h1 for different frame models was limited in the test as shown in the table below:

[0051] Table 1 Drop height (in millimeters)

[0052]

[0053] like Figure 1 , Figure 3 and Figure 11 As shown, the working principle of the second impact test mode (chassis drop test) is as follows:

[0054] Clamping and counterweighting: Install the frame / fork assembly onto the clamping assembly 6, and fasten the corresponding standard counterweights (M1, M2, M3) at the seat tube, front tube and bottom bracket according to national standards. At this time, the positioning assembly 4 does not apply locking force to ensure that the frame can rotate freely around the rear axle. Place the frame and fork on the anvil block 14 to put the frame in a normal use posture, and measure the initial wheelbase x1.

[0055] Angle Calculation and Lifting: Based on the required drop height h2 according to national standards and the measured wheelbase x1, the control system automatically calculates the required flip angle α using the formula h2 = x1 × sinα. The flip motor 12 is then started. With the clutch assembly 5 engaged, the clamping assembly 6, along with the counterweighted frame, is driven to flip precisely backward by the angle α, thereby lifting the roller at the front end of the frame to the precise height h2. (It should be noted that, considering the different frame models and their varying shapes and structures, traditional techniques make it difficult to control the height when pulling the frame to different heights. Therefore, this is converted into a flip angle. The wheelbase can be considered as the radius, and the height of the front axle relative to the anvil block 14 is the side directly opposite the flip angle, with the wheelbase as the hypotenuse.)

[0056] Free Release and Impact: After the frame is lifted into position, the clutch assembly 5 is activated to disconnect the power connection between the output shaft of the tilting motor 12 and the rotating shaft of the clamping assembly 6. At this time, the frame assembly is in a state where it is only subject to gravity and can rotate freely around the rear axle. The equipment then releases the frame, and the frame assembly tilts forward and falls freely under the action of gravity. The roller or fork at its front end impacts the anvil block 14 to complete the impact test. After the test, the wheelbase x2 can be measured again.

[0057] The drop height h2 and weight mass limits for different frame models in the test are shown in the table below:

[0058] Table 2 Drop Height and Weight Mass at Seatpost, Front Tube, and Bottom Axle (in millimeters)

[0059]

[0060] Preferably, the flipping motor 12 is a servo motor, which is the key to achieving high-precision and multi-functional testing. Its effect and principle are reflected in the following: when the frame is dropped, the high-precision angle control capability of the servo motor can ensure that the frame is accurately flipped to the calculated angle α, thereby strictly meeting the requirements of the national standard for different heights h2 of different models (such as 200mm for city cars and 200mm for racing cars). It can also accurately control the frame to flip to a vertical state during the drop test.

[0061] Example 2

[0062] like Figure 4 , Figure 5 and Figure 12As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the clutch assembly 5 includes a control box 11 fixedly connected to the top of the platform 2. A slide rod 502 is fixedly connected inside the control box 11, and a slide plate 507 is slidably connected to the outside of the slide rod 502. A rotating rod 505 is rotatably connected to the slide plate 507. A through hole is provided on the control box 11, and one end of the rotating rod 505 extends through the through hole to the outside of the control box 11, while the other end is fixedly connected to a first spline shaft 506. A drive shaft 503 is rotatably connected to the side of the control box 11 away from the through hole. One end of the drive shaft 503 is fixedly connected to the rotating shaft of the clamping assembly 6, and the other end... The control box 11 has a first spline groove 504 at one end, a first spring 511 is sleeved on the outside of the slide rod 502, a second iron block 510 is fixedly connected to one side of the slide plate 507, a second electromagnet 509 is fixedly connected to the side of the control box 11 near the through hole, and the second electromagnet 509 works in conjunction with the second iron block 510; a worm gear 508 is fixedly connected to the outside of the rotating rod 505, a worm 501 is rotatably connected between the inner walls of the control box 11, the worm 501 meshes with the worm gear 508, and a flip motor 12 is fixedly connected to the outside of the control box 11, the output end of the flip motor 12 extends into the inside of the control box 11 and is fixedly connected to one end of the worm 501.

[0063] In the above scheme, when the frame is dropped, the frame needs to rotate freely around the rear axle and fall. If the output shaft of the flipping motor 12 and the rotation shaft of the clamping assembly 6 are always in a rigid connection state, the magnetic resistance inside the motor rotor, the bearing friction and the damping of the reduction mechanism will form a non-negligible resistance torque. This resistance torque will seriously interfere with the free fall motion of the frame assembly, causing its initial velocity and acceleration to deviate from the theoretical value under pure gravity, thus causing the impact energy to deviate from the conditions specified by the national standard, ultimately significantly reducing the test accuracy and making it impossible to obtain true and effective test results.

[0064] In this embodiment, the clutch assembly 5 enables a quick and reliable connection and disconnection between the power output end of the flipping motor 12 and the rotating shaft of the clamping assembly 6. When the frame needs to be flipped at an angle (such as being lifted to a height h2), the clutch assembly 5 reliably engages and transmits torque. When the frame needs to fall freely, the clutch assembly 5 can instantly and completely disengage, completely eliminating any resistance from the motor side that interferes with the free rotation of the frame. This ensures that the frame falls completely freely, strictly conforming to the physical definition of free fall in the national standard, thereby fundamentally guaranteeing the accuracy of the impact energy and the high precision of the test results in the frame drop test.

[0065] Its specific working principle is as follows: When it is necessary to disconnect the power connection, the second electromagnet 509 is energized, generating a magnetic force to attract the second iron block 510. This attraction force drives the slide plate 507 to slide on the slide rod 502 towards the second electromagnet 509 and compress the first spring 511. The movement of the slide plate 507 pushes the first spline shaft 506 away from the transmission shaft 503 through the rotating rod 505, so that the first spline shaft 506 completely exits from the first spline groove 504 at the end of the transmission shaft 503, realizing the complete separation of power transmission.

[0066] When a power connection is required, the second electromagnet 509 is de-energized and the magnetic force disappears. At this time, the compressed first spring 511 releases its stored elastic potential energy, pushing the slide plate 507 to slide back away from the second electromagnet 509 on the slide rod 502. The reset movement of the slide plate 507 drives the first spline shaft 506 to move towards the transmission shaft 503 through the rotating rod 505 until the first spline shaft 506 is fully inserted into the first spline groove 504 of the transmission shaft 503, realizing the transmission connection between the two, so that the torque of the flipping motor 12 can be transmitted to the rotating shaft of the clamping assembly 6.

[0067] Furthermore, when the clutch needs to engage but the spline teeth are not aligned, the tilting motor 12 can be activated. The tilting motor 12 drives the worm 501 to rotate, which in turn drives the worm wheel 508 meshing with it to rotate. Since the worm wheel 508 is fixedly connected to the rotating rod 505, it drives the rotating rod 505 and the first spline shaft 506 to produce a slight circumferential rotation to adjust the phase of the spline teeth, ensuring that the first spline shaft 506 can smoothly insert into the first spline groove 504 and complete a reliable engagement.

[0068] Example 3

[0069] like Figure 1 , Figure 4 and Figure 5 As shown, based on Embodiment 2, the present invention provides a technical solution: Preferably, the positioning component 4 includes a first fixing plate 401 fixedly connected to the inner side of the support block 10, a first screw 402 threadedly connected to the middle of the first fixing plate 401, and the end of the first screw 402 away from its screw head passing through the first fixing plate 401 and rotatably connected to a first clamping rod 403; the inner side of the support block 10 is connected to a rotating plate 404 through an angle adjustment structure 41, the angle adjustment structure 41 can adjust the angle of the rotating plate 404 and keep it fixed, and a second screw 405 threadedly connected to the rotating plate 404, the end of the second screw 405 away from its screw head passing through the rotating plate 404 and rotatably connected to a second clamping rod 406.

[0070] When the drop test is carried out, the hammer 9 will impact the front fork of the frame vertically with a large kinetic energy. If the frame only holds the rear axle by the clamping assembly 6 and relies on the tilt motor 12 and the clutch assembly 5 in the engaged state to maintain its vertical fixed angle, the huge impact force and vibration will be directly transmitted to the entire tilt drive system through the frame. This can easily cause damage to the internal gears, bearings of the tilt motor 12 and the precision splines in the clutch assembly 5 due to overload impact, seriously affecting the core drive function and long service life of the equipment.

[0071] In this embodiment, by setting an independent positioning component 4, a direct, reliable, and adjustable mechanical locking is provided for the frame when subjected to drop impact. This component replaces the fixing function of the tilting drive system in the drop test, so that the impact force is completely directed to the sturdy platform 2 and test frame 1, thereby completely isolating the impact load from the risk of damage to the precision drive structure (tilting motor 12, clutch assembly 5) and protecting the core power unit of the equipment. At the same time, its two-way (vertical and adjustable angle) clamping design ensures that the frame will not undergo any displacement or deflection under huge impact, ensuring the accuracy of the impact force and the repeatability of the test results. It should be noted that by setting an adjustable angle second clamp 406, not only is the adaptability of the equipment to frames with different geometries enhanced, but the second clamp 406 can also be stored away when the frame is dropped, thereby avoiding the influence on the frame drop test.

[0072] Before conducting the drop test, after the frame is clamped by the clamping assembly 6 and driven to a vertical position by the tilting motor 12, the positioning assembly 4 is operated to lock it: vertical fixation: rotate the first screw 402 to push the first clamping rod 403 rotatably connected to it to rise in the vertical direction (means must be taken to keep the first clamping rod 403 from rotating) until it is firmly pressed against the front fork tube or designated part of the frame, eliminating the vertical degree of freedom;

[0073] Angle and direction fixation: First, adjust the tilt angle of the rotating plate 404 by adjusting the angle adjustment structure 41 so that the predetermined movement direction of the second clamp 406 on it can be accurately aligned with another point to be fixed on the frame (such as the lower tube or rear upper fork). Then, rotate the second screw 405 to push the second clamp 406 forward in the direction set by the rotating plate 404 (means must be used to keep the second clamp 406 from rotating) until it is firmly pressed against the frame from the side or at an angle.

[0074] With the first clamping rod 403 and the second clamping rod 406 clamping from two different directions, the frame is rigidly fixed on the platform 2, forming a stable triangular constraint. At this time, even if the clutch assembly 5 is disengaged, the frame will not rotate due to the impact of the hammer 9. All the impact energy is borne by the rigid structure composed of the positioning assembly 4, the platform 2 and the test frame 1, thereby protecting the rollover drive system.

[0075] During the frame drop test, the first screw 402 is rotated to move the first clamping rod 403 downward so that it does not obstruct the frame's flipping path. The angle of the rotating plate 404 is adjusted to a horizontal state by the angle adjustment structure 41. Then, the second screw 405 is rotated to move the second clamping rod 406 downward so that it does not obstruct the frame's drop path.

[0076] like Figure 4 , Figure 6 and Figure 7 As shown, preferably, the angle adjustment structure 41 includes a fixed cylinder 411 fixedly connected to the inner wall of the support block 10. A core column 413 is rotatably connected to the opening of the fixed cylinder 411. A first transmission groove 412 is provided at the bottom of the fixed cylinder 411. A second transmission groove 414 is provided at one end of the core column 413 located inside the fixed cylinder 411. A transmission column 417 is slidably connected between the inner walls of the second transmission groove 414. A control lever 415 is fixedly connected to one end of the transmission column 417. The end of the control lever 415 away from the transmission column 417 extends through to the outside of the core column 413 and is fixedly connected to a control plate 416. The control lever 415 is slidably connected to the core column 413. A second spring 418 is sleeved on the outside of the control lever 415 and inside the second transmission groove 414. The first transmission groove 412, the second transmission groove 414, and the transmission column 417 are multi-faceted prism structures with matching shapes.

[0077] Since the positioning component 4 needs to withstand the impact of the weight 9 when fixing the frame, if only a structure that uses friction, such as a damping pivot, is used for angle adjustment, there will be a problem of unstable fixing.

[0078] In this embodiment, the angle adjustment structure 41 is implemented based on the engagement of polygonal cylindrical surfaces. Through simple pulling and rotating operations, the angle of the rotating plate 404 can be quickly and infinitely adjusted. When the adjustment is in place, the control lever 415 is released, and the mechanism automatically returns to the engagement state of the polygonal cylindrical surfaces under the action of the spring, realizing reliable mechanical rigidity self-locking. This locking method does not rely on friction, so it has extremely strong resistance to vibration and impact. It can ensure that the support angle of the second clamping rod 406 is absolutely stable under the harsh working conditions of the drop test, thereby ensuring the reliability of the overall fixation of the positioning component 4.

[0079] Adjustment state (unlocked): When it is necessary to adjust the angle of the rotating plate 404, pull the control plate 416 outward, which will drive the control lever 415 and the transmission column 417 to compress the second spring 418 and move it into the core column 413. At this time, the transmission column 417 completely exits from the first transmission groove 412 at the bottom of the fixed cylinder 411 and remains only in the second transmission groove 414 of the core column 413. Since the transmission column 417 and the second transmission groove 414 are polygonal, and the core column 413 is fixed to the rotating plate 404, the rotating plate 404, the core column 413 and the transmission column 417 can be rotated freely and continuously around the axis of the fixed cylinder 411 as a whole, thereby adjusting the angle of the rotating plate 404.

[0080] Locked state: When the rotating plate 404 is rotated to the required angle, the control plate 416 is released. Under the restoring force of the second spring 418, the transmission column 417 is pushed, so that one end of it is re-inserted into the first transmission groove 412 at the bottom of the fixed cylinder 411. Since the first transmission groove 412, the second transmission groove 414 and the transmission column 417 are all multi-faceted prisms with matching shapes (such as octagonal prisms and hexagonal prisms, the number of edges corresponds to the adjustment level. Increasing the number of edges can improve the adjustment flexibility, but will reduce the load-bearing capacity. Therefore, the preferred number of edges is eight). After they are aligned axially, they will form a strict tooth mesh in the circumferential direction. This meshing will rigidly lock the core column 413 (and the rotating plate 404 fixed thereto) and the fixed cylinder 411 in the circumferential direction, preventing relative rotation, thereby achieving absolute fixation of the angle.

[0081] Example 4

[0082] like Figure 2 , Figure 3 and Figure 9 As shown, based on Embodiment 3, the present invention provides a technical solution: Preferably, the platform 2 has an adjustment groove 711 inside, an adjustment screw 701 is rotatably connected inside the adjustment groove 711, a slider 703 is threadedly connected to the outside of the adjustment screw 701, the slider 703 is slidably connected to the adjustment groove 711, an adjustment motor 702 is fixedly connected to one side of the platform 2, the output end of the adjustment motor 702 is fixedly connected to the adjustment screw 701, and L-shaped blocks are symmetrically fixedly connected to both sides of the slider 703. 704. A side plate 705 is fixedly connected between the tops of the two L-shaped blocks 704. A guide rod 706 is slidably connected to the side plate 705. One end of the guide rod 706 is fixedly connected to a limit block 707. The end of the guide rod 706 away from the limit block 707 extends to the other side of the side plate 705 and is fixedly connected to a feedback plate 710. A third spring 708 is sleeved on the outside of the guide rod 706 and between the feedback plate 710 and the side plate 705. A pressure sensor 709 is installed between the feedback plate 710 and the side plate 705.

[0083] In this embodiment, by integrating a wheelbase measurement system, the wheelbase measurement before and after the test can be completed automatically and accurately on the testing machine body without disassembling or moving the frame. The system drives the distance measuring mechanism to move along the frame axis by a motor, uses a high-sensitivity pressure sensor 709 to detect the instantaneous state of contact with the axle, and records the position coordinates by the control system, thereby realizing automatic measurement.

[0084] The working principle of the measurement system is as follows: The coordinates of the slider 703 when it is in the initial position are known values. During measurement, the adjusting motor 702 is started, driving the adjusting screw 701 to rotate, thereby causing the slider 703 and the entire measuring unit on it to slide horizontally in the adjusting groove 711 and move axially towards the clamped frame. When the feedback plate 710 contacts the axle, it is blocked, while the slider 703 continues to move forward slightly under the drive of the motor, forcing the feedback plate 710 to compress the third spring 708. At the same time, the feedback plate 710 presses the pressure sensor 709. That is, when the pressure value detected by the pressure sensor 709 changes and exceeds the threshold (this threshold is set to eliminate the error caused by vibration due to inertia, etc.), the control system immediately determines that it has accurately contacted the axle and simultaneously records the displacement of the slider 703 at this time. The wheelbase x can be obtained by recording the difference between the initial value and the displacement. By executing this automatic measurement process once before and after the test, the permanent deformation Δx of the frame can be calculated accurately and efficiently.

[0085] Example 5

[0086] like Figure 1 , Figure 3 and Figure 8 As shown, based on Embodiment 4, the present invention provides a technical solution: Preferably, the traction assembly 3 includes a traction motor 303 fixedly connected to the top of the test frame 1, a winding frame 301 fixedly connected to the top of the test frame 1, a wire feeding reel 302 rotatably connected to the inner side of the winding frame 301, the output end of the traction motor 303 fixedly connected to the central axis of the wire feeding reel 302, a guide wheel 304 rotatably connected to the top of the test frame 1, and a sling 305 including an upper section and a lower section. The upper section of the sling 305 is wound on the wire feeding reel 302, and the lower section is connected to the first electromagnet 306. The upper section and the lower section of the sling 305 are connected by an S-type weighing sensor 13.

[0087] In this embodiment, by integrating the S-type weighing sensor 13 into the traction component 3, while realizing the basic traction function, two important auxiliary functions are derived, which significantly improve the equipment's self-calibration, self-measurement capabilities and test integration. Effect 1: The suspended weight 9 can be quickly weighed before the test to ensure that its quality meets national standards, thus ensuring the accuracy of the test conditions from the source. Effect 2: After the drop test, the traction system itself can be innovatively used as a high-precision distance measuring tool to automatically and non-destructively detect the position of the front axle of the frame. By comparing it with the reference position recorded before the test, the permanent deformation Δx can be directly calculated, providing an efficient and embedded measurement scheme that reduces the dependence on external or additional measuring mechanisms.

[0088] Weight verification: Before the drop test, when the weight 9 is suspended by the sling 305 and stationary, the stable tension value F measured by the S-type load cell 13 can be directly converted into the actual mass of the weight 9 according to the formula m = F / g, given that the gravitational acceleration g is known. The system compares this value with the standard value (22.5kg). If the deviation exceeds the allowable range, an alarm will be triggered to ensure the accuracy of the test foundation.

[0089] Automatic measurement of front axle position (deformation Δx): After the drop impact, keep the sling 305 connected to the hammer 9, and control the traction motor 303 to lower the hammer 9 at a very slow speed. In the initial stage of lowering, the sensor signal remains stable. When the bottom of the hammer 9 is about to contact the roller or front fork on the frame, the tension of the sling 305 begins to change slightly (usually decreases). The control system monitors this tension change rate in real time through a high sampling rate or sets a small threshold change. At the moment the change is detected, the precise position coordinate H1 corresponding to the encoder or height sensor of the traction motor 303 is immediately recorded. This coordinate corresponds to the front axle height of the frame after the impact. Before the test, a front axle reference height coordinate H0 can be obtained in advance under the same clamping condition using the same method. The absolute value of the height coordinate difference between the two measurements, |H1-H0|, is equivalent to the vertical displacement of the front axle caused by the impact. After the geometric relationship between this displacement and the frame deformation is determined, the permanent deformation Δx of the wheelbase can be accurately calculated. Therefore, no special detection is required.

[0090] like Figure 1-5 As shown, preferably, the lifting frame 8 includes four symmetrically arranged H-shaped frames 801. Each H-shaped frame 801 includes two long rods and a short rod fixedly connected between the two long rods. Two rollers 802 are symmetrically rotatably connected between the two long rods. The rollers 802 are all rotatably connected to the uprights of the test frame 1. A lifting plate 803 is fixedly connected between the four H-shaped frames 801.

[0091] In the drop test, the lifting frame 8 (carrying the weight 9) needs to undergo a long-stroke, high-speed free fall along the column of the test frame 1. If a traditional sliding friction guiding method (such as direct contact between the slider and the guide rail) is used, significant and unstable frictional resistance will be generated. This resistance will consume the gravitational potential energy of the falling weight 9, causing its impact velocity and acceleration to be lower than the theoretical free fall value, thus distorting the impact energy and reducing the test accuracy. In addition, sliding friction is prone to wear and jamming. After long-term use, the gap will increase, which will also introduce mechanical reliability problems such as unstable operation and shaking of the lifting frame 8.

[0092] In this embodiment, the combination design of the H-shaped frame 801 and the roller 802 transforms sliding friction into rolling friction, greatly reducing the resistance of the lifting frame 8's vertical movement. This makes the falling process of the hammer 9 closer to the ideal free fall state, ensuring the accuracy of the impact energy from a mechanical perspective. Secondly, the close cooperation between the roller 802 and the column ensures that the lifting frame 8 runs smoothly and without jamming or shaking, improving the reliability of the equipment. Finally, the four symmetrically distributed H-shaped frames 801 and rollers 802 form a stable four-sided constraint guide system, effectively preventing the lifting frame 8 from twisting or tilting during movement, ensuring that the hammer 9 always falls accurately along the vertical track, further improving the repeatability and accuracy of the test.

[0093] like Figure 4 As shown, preferably, the clamping assembly 6 includes a bidirectional screw 601 rotatably connected to the inner side of the support block 10. The external thread of the bidirectional screw 601 is connected to an internal thread sleeve. The internal thread sleeve includes a bearing portion 611, an end plate 612 disposed at one end of the bearing portion 611, and an external thread portion 613 disposed on the side of the bearing portion 611 away from the end plate 612. The outer wall of the external thread portion 613 is threaded, and a clamping nut 602 is threadedly connected to the external thread portion 613. One end of the clamping nut 602 is rotatably connected to a pressure seat 603.

[0094] In this embodiment, the synergistic effect of outer positioning and inner clamping ensures that the rear axle of the frame will not slip or loosen when subjected to impact. During clamping, firstly, according to the width of the rear fork of the frame, the internal threaded sleeve is rotated to move on the double-ended screw 601, thereby driving the two end plates 612 to approach and press against both sides of the rear axle of the frame from the outside, completing the initial centering and outer positioning (since the horizontal offset has little impact on the test, only manual judgment of the centering degree is required); then, the clamping nut 602 is tightened, and the nut moves along the outer thread 613 of the internal threaded sleeve, pushing the pressure seat 603 rotatably connected to it to move towards the axle, pressing against the axle from the inside, so that the axle is finally stably constrained in the rigid clamp formed by the end plate 612 (outer side) and the pressure seat 603 (inner side), and this clamping force is maintained by the clamping nut 602 alone;

[0095] Subsequently, during the frame drop test, the double-acting screw 601 is driven to rotate. At this time, the double-acting screw 601 acts only as a drive shaft, causing the entire locked internal threaded sleeve, axle, and clamping assembly 6 to rotate around its axis. The rotation of the screw itself does not change the axial position of the internal threaded sleeve, so the established clamping state is completely undisturbed, thus ensuring the absolute reliability of clamping during the test. It should be noted that during the upward rotation of the frame, if the internal threaded sleeve is kept from rotating, the rotation of the double-acting screw 601 will cause the internal threaded sleeve to move towards the side closer to the frame. However, this side is blocked by the frame and the clamping nut 602 and cannot move, so it will not automatically loosen. Conversely, the double-acting screw 601 does not provide a large torque relative to the frame in the opposite direction to the above direction, so it will not cause the internal threaded sleeve to loosen.

[0096] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A bicycle frame impact testing machine, comprising a test frame (1) and a platform (2); characterized in that, Also includes: A traction assembly (3) is disposed on top of the test frame (1), the traction assembly (3) having a retractable sling (305) for lifting or releasing the load; The lifting frame (8) is movably connected to the inside of the test frame (1) and can move up and down along it. The top of the lifting frame (8) is fixedly connected to a first iron block (307), and the bottom of the sling (305) is fixedly connected to a first electromagnet (306). The first electromagnet (306) and the first iron block (307) are used together. The bottom of the lifting frame (8) is fixedly connected to a weight (9). Support block (10) is fixedly connected to the top of the platform (2); clamping assembly (6) is rotatably connected to the inside of the platform (2) for clamping the rear axle of the bicycle frame; A positioning component (4) is disposed on the platform (2) for cooperating with the clamping component (6) to fix the bicycle frame; The flip motor (12) has its output end connected to the clamping assembly (6) in a disengaged transmission manner via a clutch assembly (5) to drive the clamped frame to flip to a predetermined angle; the clutch assembly (5) is used to control the connection and disconnection of power between the flip motor (12) and the clamping assembly (6); Anvil (14) is positioned on top of the platform (2) and below the flipping trajectory of the clamping assembly (6); The clutch assembly (5) includes a control box (11) fixedly connected to the top of the platform (2). A slide rod (502) is fixedly connected inside the control box (11). A slide plate (507) is slidably connected to the outside of the slide rod (502). A rotating rod (505) is rotatably connected to the slide plate (507). A through hole is provided on the control box (11). One end of the rotating rod (505) extends to the outside of the control box (11) through the through hole, and the other end is fixedly connected to a first spline shaft (506). A drive shaft (503) is rotatably connected to the side of the control box (11) away from the through hole. One end of the drive shaft (503) is fixedly connected to the rotating shaft of the clamping assembly (6), and the other end is provided with a first spline groove (504). The slide rod... The outer side of (502) is fitted with a first spring (511), and a second iron block (510) is fixedly connected to one side of the slide plate (507). A second electromagnet (509) is fixedly connected to the side of the control box (11) near the through hole. The second electromagnet (509) and the second iron block (510) are used in conjunction. A worm gear (508) is fixedly connected to the outer side of the rotating rod (505). A worm (501) is rotatably connected between the inner walls of the control box (11). The worm (501) is meshed with the worm gear (508). The flip motor (12) is fixedly connected to the outside of the control box (11). The output end of the flip motor (12) extends into the inside of the control box (11) and is fixedly connected to one end of the worm (501).

2. The bicycle frame impact testing machine according to claim 1, characterized in that: The positioning component (4) includes a first fixing plate (401) fixedly connected to the inner side of the support block (10). A first screw (402) is threadedly connected to the middle of the first fixing plate (401). The end of the first screw (402) away from its screw head passes through the first fixing plate (401) and is rotatably connected to a first clamping rod (403). The inner side of the support block (10) is connected to a rotating plate (404) through an angle adjustment structure (41). The angle adjustment structure (41) can adjust the angle of the rotating plate (404) and keep it fixed. A second screw (405) is threadedly connected to the rotating plate (404). The end of the second screw (405) away from its screw head passes through the rotating plate (404) and is rotatably connected to a second clamping rod (406).

3. The bicycle frame impact testing machine according to claim 2, characterized in that: The angle adjustment structure (41) includes a fixed cylinder (411) fixedly connected to the inner wall of the support block (10). A core column (413) is rotatably connected to the opening of the fixed cylinder (411). A first transmission groove (412) is provided at the bottom of the fixed cylinder (411). A second transmission groove (414) is provided at one end of the core column (413) located inside the fixed cylinder (411). A transmission column (417) is slidably connected between the inner walls of the second transmission groove (414). One end of the transmission column (417) is fixed. A control lever (415) is fixedly connected to the core column (413). One end of the control lever (415) away from the transmission column (417) extends through to the outside of the core column (413) and is fixedly connected to a control plate (416). The control lever (415) is slidably connected to the core column (413). A second spring (418) is sleeved on the outside of the control lever (415) and inside the second transmission groove (414). The first transmission groove (412), the second transmission groove (414), and the transmission column (417) are multi-faceted prism structures with matching shapes.

4. The bicycle frame impact testing machine according to claim 3, characterized in that: The platform (2) has an adjustment groove (711) inside, and an adjustment screw (701) is rotatably connected inside the adjustment groove (711). A slider (703) is threadedly connected to the outside of the adjustment screw (701). The slider (703) is slidably connected to the adjustment groove (711). An adjustment motor (702) is fixedly connected to one side of the platform (2). The output end of the adjustment motor (702) is fixedly connected to the adjustment screw (701). L-shaped blocks (704) are symmetrically fixedly connected to both sides of the slider (703). The two L-shaped blocks (704) are... A side plate (705) is fixedly connected to the top. A guide rod (706) is slidably connected to the side plate (705). A limit block (707) is fixedly connected to one end of the guide rod (706). The end of the guide rod (706) away from the limit block (707) extends to the other side of the side plate (705) and is fixedly connected to a feedback plate (710). A third spring (708) is sleeved outside the guide rod (706) and between the feedback plate (710) and the side plate (705). A pressure sensor (709) is installed between the feedback plate (710) and the side plate (705).

5. The bicycle frame impact testing machine according to claim 1, characterized in that: The traction assembly (3) includes a traction motor (303) fixedly connected to the top of the test frame (1). The top of the test frame (1) is fixedly connected to a winding frame (301). The inner side of the winding frame (301) is rotatably connected to a wire reel (302). The output end of the traction motor (303) is fixedly connected to the central axis of the wire reel (302). The top of the test frame (1) is rotatably connected to a guide wheel (304). The sling (305) includes an upper section and a lower section. The upper section of the sling (305) is wound on the wire reel (302), and the lower section is connected to a first electromagnet (306). The upper and lower sections of the sling (305) are connected by an S-type weighing sensor (13).

6. The bicycle frame impact testing machine according to claim 1, characterized in that: The lifting frame (8) includes four symmetrically arranged H-shaped frames (801). Each H-shaped frame (801) includes two long rods and a short rod fixedly connected between the two long rods. Two rollers (802) are symmetrically rotatably connected between the two long rods. The rollers (802) are all rotatably connected to the column of the test frame (1). A lifting plate (803) is fixedly connected between the four H-shaped frames (801).

7. The bicycle frame impact testing machine according to claim 1, characterized in that: The clamping assembly (6) includes a bidirectional screw (601) rotatably connected to the inside of the support block (10). The external thread of the bidirectional screw (601) is connected to an internal thread sleeve. The internal thread sleeve includes a bearing part (611), an end plate (612) disposed at one end of the bearing part (611), and an external thread part (613) disposed on the side of the bearing part (611) away from the end plate (612). The outer wall of the external thread part (613) is threaded. The external thread part (613) is threadedly connected to a clamping nut (602). One end of the clamping nut (602) is rotatably connected to a pressure seat (603).

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