Dynamic deformation modulus tester

Abstract

The invention relates to the technical field of mechanical property detection of civil engineering materials, and discloses a dynamic deformation modulus tester, which comprises a mechanical supporting component, the active vibration isolation component is used for inhibiting external vibration interference; the load generating component comprises a guide rod, the bottom end of the guide rod is fixed with the damping piece, and the top end of the guide rod is fixed on the mechanical supporting component; the impact hammer sleeves the outer side of the guide rod in a sliding manner; the automatic lifting mechanism comprises a flexible connecting piece, a pulling assembly and a rotary driving assembly. According to the automatic lifting mechanism, the swing arm is driven to swing through the rotary driving assembly, and the full-process automatic action of lifting and releasing of the impact hammer is achieved by combining the synergistic effect of the pulling assembly and the flexible connecting piece. According to the automatic lifting mechanism, the swing arm is controlled to move through the rotary driving assembly, the flexible connecting piece is accurately pulled to complete lifting of the impact hammer, the unlocking part is triggered at the preset height to release the impact hammer, and the problems that manual operation is low in efficiency and large in labor intensity are thoroughly solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical property testing of civil engineering materials, and more specifically, it relates to a dynamic deformation modulus tester. Background Art

[0002] The dynamic deformation modulus tester (also known as the falling weight deflectometer) is a core device for evaluating the dynamic bearing performance of materials such as soil and subgrade. It calculates the dynamic deformation modulus (Evd) by simulating the stress-strain response of materials under impact loads, providing key data for civil engineering quality inspection, rail transit subgrade evaluation, etc. Traditional falling weight deflectometers usually adopt a manual operation mode, that is, the impact hammer is manually lifted and released to apply dynamic loads, and sensors are used to collect deformation data. Although such devices show strong environmental adaptability in the application of field engineering sites, there are significant contradictions between their design characteristics and laboratory test requirements.

[0003] In the laboratory scenario, to study the dynamic mechanical properties of materials, it is necessary to conduct high-frequency and repetitive impact tests on the same specimen to obtain reliable parameters in a statistical sense. However, the existing manual devices have the following limitations: low operation efficiency, as each test requires manual completion of the processes of lifting, fixing, and releasing the impact hammer, resulting in high labor intensity for experimental personnel and difficulty in achieving continuous testing. Introduction of human errors, manual operation is prone to small deviations in the release height and attitude of the impact hammer, affecting the consistency of load application and reducing the comparability of test results. Insufficient automation level, lacking programmed control of test frequency and impact energy, and being difficult to meet the simulation requirements of complex working conditions (such as multi-level loads and variable-rate impacts). Although there have been some attempts at automation improvement in the existing technology, such as using a chain lifting mechanism driven by a motor, its structure is complex, the failure rate is high, and it is difficult to solve the vibration interference problem at the moment of impact hammer release. Therefore, there is an urgent need to develop a dynamic deformation modulus tester suitable for the laboratory scenario, which can achieve full-process automation of the impact hammer lifting and release while ensuring measurement accuracy, reducing human intervention to meet the requirements of high-frequency and high-consistency tests. Summary of the Invention

[0004] The purpose of the present invention is to provide a dynamic deformation modulus tester to solve the above-mentioned technical problems.

[0005] The present invention solves the above-mentioned existing technical problems through the following technical solutions:

[0006] The present invention provides a dynamic deformation modulus tester, comprising:

[0007] A mechanical support component;

[0008] An active vibration isolation component for suppressing external vibration interference;

[0009] A load generating component, comprising:

[0010] A guide rod, whose bottom end is fixed to a damping component and whose top end is fixed to a mechanical support component;

[0011] An impact hammer, which is slidably sleeved outside the guide rod;

[0012] An automatic lifting mechanism, including: a flexible connecting member, a pulling component, and a rotary driving component. The flexible connecting member connects the impact hammer and the mechanical support component. The driving end of the rotary driving component is connected with a swing arm. The pulling component includes a retractable pulling contact part arranged at the end of the swing arm and an unlocking part for triggering the contraction of the pulling contact part. When the rotary driving component drives the swing arm to swing to a preset position, the unlocking part triggers the contraction of the pulling contact part to release the flexible connecting member, so that the impact hammer freely falls along the guide rod;

[0013] A measuring component, which is used to monitor in real time the dynamic deformation parameters of the material to be measured under impact load.

[0014] As a further optimized solution of the present invention, the pulling contact part includes a pulling rod, a sleeve, a return spring, and a contraction driving part. The sleeve is slidably sleeved outside the pulling rod, and its outside is fixed to the end of the swing arm; the return spring connects the pulling rod and the sleeve, and the contraction driving part drives the pulling rod to retract into the sleeve by cooperating with the unlocking part.

[0015] As a further optimized solution of the present invention, the contraction driving part is a gear transmission structure, including a transmission gear, a matching convex shaft, and a spiral groove. The transmission gear is rotatably installed at the end of the sleeve, the matching convex shaft is fixed inside the transmission gear, the spiral groove is arranged outside the pulling rod and slidably cooperates with the matching convex shaft, and the unlocking part is an arc-shaped rack whose center of the circle coincides with the rotation center of the swing arm.

[0016] As a further optimized solution of the present invention, the contraction driving part is an arc surface extrusion structure, including an extrusion inclined block slidably installed at the end of the sleeve and a compression inclined groove arranged on the pulling rod. The extrusion inclined block is connected with the sleeve through a support spring, the unlocking part is a contact plate with an arc surface, and the arc surface of the contact plate pushes the extrusion inclined block into the compression inclined groove to drive the pulling rod to contract.

[0017] As a further optimized solution of the present invention, the contraction driving part is an electromagnetic driving structure, including an electromagnet arranged in the sleeve, a magnetic sheet arranged at the end of the pulling rod, a conductive switch arranged on the sleeve, and an infrared sensor for triggering the electromagnet to be energized; when the swing arm rotates to the detection position of the infrared sensor, the electromagnet adsorbs the magnetic sheet to make the pulling rod contract.

[0018] As a further optimization scheme of the present invention, the rotating drive assembly includes a driving motor and a large and small gear set that mesh with each other. The driving end of the driving motor is connected to the large and small gear set. The diameter of the large gear is at least twice that of the small gear to reduce the swing speed of the swing arm.

[0019] As a further optimization solution of the present invention, the active vibration isolation component includes a concrete foundation to be measured, a rigid base and an active noise reduction unit, and the active noise reduction unit offsets the noise transmitted by the foundation by generating reverse vibration.

[0020] As a further optimization solution of the present invention, the mechanical support component includes a sliding seat with adjustable height and a retractable support frame, and the top end of the guide rod is threadedly connected to the support frame.

[0021] As a further optimization scheme of the present invention, the measuring component includes: a foldable and retractable mounting frame, a dynamic deformation modulus sensor, a force sensor installed on the impact hammer, a strain network component arranged at the four corners of the impact platform, and three equidistantly distributed displacement sensors.

[0022] As a further optimization solution of the present invention, the sliding seat is provided with a winding wheel for winding the flexible connecting member to adapt to different impact heights.

[0023] The beneficial effects of the present invention are:

[0024] The automatic lifting mechanism of the present invention drives the swing arm to swing through the rotary drive component, and combines the pulling component with the flexible connector to achieve the full process automation of lifting and releasing the impact hammer. The automatic lifting mechanism controls the movement of the swing arm through the rotary drive component, accurately pulls the flexible connector to complete the lifting of the impact hammer, and triggers the unlocking part to release the impact hammer at a preset height, which completely solves the problems of low manual operation efficiency and high labor intensity; secondly, through the guide rod limit and wire rope margin design, it ensures that the impact hammer falls freely along a fixed trajectory, eliminates the height deviation caused by manual release, and ensures the uniformity of load application; in addition, the rotary drive component supports 360° circular operation, and with the adjustable speed gear set, the impact frequency can be programmatically controlled to meet the laboratory's high-frequency repeated testing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a dynamic deformation modulus tester provided by the present invention;

[0026] Figure 2 It is a structural schematic diagram of a load generating component in a dynamic deformation modulus tester provided by the present invention;

[0027] Figure 3 It is a structural schematic diagram of an impact hammer, a flexible connector and an automatic lifting mechanism in a dynamic deformation modulus tester provided by the present invention;

[0028] Figure 4 is the partial enlarged schematic view of part A in the present invention Figure 3 in the figure;

[0029] Figure 5 is the sectional view of the pulling contact part in a dynamic deformation modulus tester provided by the present invention;

[0030] Figure 6 is the structural schematic view of the automatic lifting mechanism in a dynamic deformation modulus tester provided by the present invention;

[0031] Figure 7 is the structural schematic view of the rotary drive assembly in a dynamic deformation modulus tester provided by the present invention;

[0032] Figure 8 is the structural schematic view of the active vibration isolation component in a dynamic deformation modulus tester provided by the present invention;

[0033] Figure 9 is the sectional view of the active vibration isolation component in a dynamic deformation modulus tester provided by the present invention;

[0034] Figure 10 is the structural schematic view of the mechanical support component in a dynamic deformation modulus tester provided by the present invention;

[0035] Figure 11 is the structural schematic view of the second embodiment in a dynamic deformation modulus tester provided by the present invention;

[0036] Figure 12 is the sectional view of the partial position of the sleeve in the second embodiment of the present invention;

[0037] Figure 13 is the structural schematic view of the third embodiment in a dynamic deformation modulus tester provided by the present invention;

[0038] Figure 14 is the sectional view of the partial position of the sleeve in the third embodiment of the present invention.

[0039] In the figure:

[0040] 1. Mechanical support component;

[0041] 11. Main frame body; 12. Sliding seat; 13. Support frame; 14. Locking rotating rod;

[0042] 2. Active vibration isolation component;

[0043] 21. Tested foundation; 22. Rigid base; 23. Active noise reduction unit; 24. Impact platform; 25. Vibration isolation groove;

[0044] 3. Load generating component;

[0045] 31. Waveform generator; 32. Damping member; 33. Guide rod; 34. Impact hammer; 35. Automatic lifting mechanism;

[0046] 351. Flexible connecting member;

[0047] 352. Pulling component; 3521. Pulling rod; 3522. Sleeve; 3523. Return spring; 3524. Driving gear; 3525. Matching convex shaft; 3526. Spiral groove; 3527. Arc-shaped rack; 3528. Extrusion inclined block; 3529. Support spring; 35210. Compressed inclined groove; 35211. Contact plate; 35212. Electromagnet; 35213. Conductive switch; 35214. Magnetic sheet;

[0048] 353. Rotating drive component; 3531. Driving motor; 3532. Matching gear; 354. Swing arm; 355. Winding wheel;

[0049] 4. Measuring component;

[0050] 41. Mounting frame; 42. Dynamic deformation modulus sensor; 43. Force sensor; 44. Strain network component; 45. Displacement sensor. Detailed implementation manners

[0051] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0052] Embodiment 1

[0053] Please refer to Figure 1 and Figure 2, A dynamic deformation modulus tester, comprising: a mechanical support member 1, an active vibration isolation member 2, and a load generating member 3. Among them, the active vibration isolation member 2 is used to suppress external vibration interference and provide a stable installation foundation for the dynamic deformation modulus sensor 42. The measuring member 4 is used to monitor the dynamic deformation parameters of the material under test under impact load in real time. The load generating member 3 includes: a waveform generator 31, a damping member 32, a guide rod 33, a hammer 34, and an automatic lifting mechanism 35. The waveform generator 31 can be a circular rubber soft pad with a certain thickness, mainly used to offset the strong noise during the collision process of the hammer 34. The damping member 32 is fixed to the top of the waveform generator 31 and sleeved on the bottom end of the guide rod 33, mainly used to absorb the vibration and residual energy after the collision impact and shorten the rebound height of the hammer 34. The top end of the guide rod 33 is fixed to the mechanical support member 1, and the hammer 34 is slidably sleeved outside the guide rod 33, and the sliding of the hammer 34 is limited by the guide rod 33.

[0054] Specifically, please refer to Figure 2 and Figure 3 , The automatic lifting mechanism 35 includes: a flexible connecting member 351, a pulling assembly 352, and a rotary driving assembly 353. The hammer 34 is fixed to the mechanical support member 1 through the flexible connecting member 351. The flexible connecting member 351 can be a steel wire rope, and the length of the steel wire rope should not be completely straightened after the hammer 34 is in the lowest position, and a certain margin should be ensured to avoid affecting the free fall movement of the hammer 34. Using a steel wire rope can also avoid excessive free movement during the pulling process and reduce the situation of detachment from the pulling assembly 352. The driving end of the rotary driving assembly 353 is connected with a swing arm 354. The pulling assembly 352 includes a pulling contact part for applying an upward pulling force to the hanging flexible connecting member 351 and an unlocking part for triggering the contraction of the pulling contact part. The pulling contact part is arranged at the end of the swing arm 354, and the unlocking part is arranged at a preset swinging position of the swing arm 354. After the rotary driving assembly 353 drives the swing arm 354 to swing to the preset position, the unlocking part drives the pulling contact part to contract and releases the flexible connecting member 351.

[0055] Please refer to Figures 1 to 3, It should be noted that when the above dynamic deformation modulus tester is in use, the impact hammer 34 is initially located at the bottom end of the guide rod 33, the flexible connecting member 351 is in a natural hanging state, the swing arm 354 is flush with the flexible connecting member 351, and the pulling contact portion is in contact with the outer side of the flexible connecting member 351. By starting the rotation drive assembly 353, the swing arm 354 can be driven to start rotating upward, and the pulling contact portion will move together with the swing arm 354 and generate an upward pulling force on the flexible connecting member 351. The impact hammer 34 is subjected to the pulling force of the flexible connecting member 351 and starts to slowly move upward along the guide rod 33. When the impact hammer 34 moves up to the preset height, the pulling contact portion just moves into contact with the unlocking portion. At this time, the rotation drive assembly 353 continues to drive the swing arm 354 to rotate downward, so that the unlocking portion drives the pulling contact portion to perform a contraction action, separating it from the flexible connecting member 351, thereby releasing the flexible connecting member 351. At this time, the impact hammer 34 loses the pulling force of the flexible connecting member 351 and starts to move downward along the guide rod 33 under its own gravity. It moves downward and contacts the damping member 32 below and collides with the active vibration isolation component 2. The acting force generated by the damping member 32 on the impact hammer 34 is reduced, so that it will not bounce up too high. During the falling process of the impact hammer 34, the measuring component 4 records various required dynamic deformation modulus parameters in real time. After that, the rotation drive assembly 353 drives the swing arm 354 to rotate 360 degrees and then stops rotating. After the impact hammer 34 is stationary after falling, the flexible connecting member 351 returns to the natural hanging state and contacts the pulling contact portion, completing a test operation. In this way, the automatic lifting mechanism 35 realizes the automatic lifting and releasing functions of the impact hammer 34, replacing the traditional manual operation. For laboratories that need to perform a large number of repeated tests, the workload of experimental personnel is greatly reduced. In addition, by controlling the rotation speed and frequency of the rotation drive assembly 353, continuous multiple test operations can be realized, and the test mode is more flexible, which can meet various different test requirements.

[0056] Please refer to Figure 3 and Figure 4 , the pulling contact portion includes a pulling rod 3521, a sleeve 3522, a return spring 3523 and a contraction driving member. The sleeve 3522 is slidably sleeved on the outer side of the pulling rod 3521. The pulling rod 3521 can be made of high-hardness stainless steel. An arc-shaped limiting groove is provided on the contact side of the pulling rod 3521 with the flexible connecting member 351, which plays a certain limiting role for the flexible connecting member 351 during the pulling process. The sleeve 3522 is fixed to the end of the swing arm 354. The return spring 3523 is fixed between the ends of the pulling rod 3521 and the sleeve 3522. The contraction driving member is used to cooperate with the unlocking portion to make the pulling rod 3521 slide and contract inwardly into the sleeve 3522.

[0057] It should be noted that when the above-mentioned pulling contact part contacts the unlocking part, the contraction driving part starts to generate a horizontal pulling force on the pulling rod 3521, causing the pulling rod 3521 to start sliding and contracting inwardly into the sleeve 3522, and the return spring 3523 is synchronously compressed and contracted. Since both ends of the flexible connecting piece 351 are fixed, it is in a tensioned state and will not be overly driven by the pulling rod 3521. As the pulling rod 3521 gradually contracts and finally separates from the pulling rod 3521, the flexible connecting piece 351 is released at this time. Under the action of the gravity of the impact hammer 34, the flexible connecting piece 351 can be driven to stretch out. Since the flexible connecting piece 351 is in a relaxed state, it will not obstruct the impact hammer 34, allowing the impact hammer 34 to slide freely. When the pulling contact part separates from the unlocking part, the pulling rod 3521 loses the pulling force of the contraction driving part and automatically slides out and resets under the elastic force of the return spring 3523.

[0058] Please refer to Figures 4 to 6 , the contraction driving part is a transmission gear 3524, a mating convex shaft 3525, and a spiral groove 3526 that slides in cooperation with the mating convex shaft 3525. The transmission gear 3524 is rotatably installed at the end of the sleeve 3522. The mating convex shaft 3525 is fixed inside the transmission gear 3524. The spiral groove 3526 is arranged on the outer side of the pulling rod 3521. The unlocking part is an arc-shaped rack 3527 whose center of the circle coincides with the rotation center of the swing arm 354.

[0059] It should be noted that when the above-mentioned contraction driving part and the unlocking part cooperate and move, the transmission gear 3524 starts to mesh with the arc-shaped rack 3527. As the swing arm 354 continues to swing upward, the transmission gear 3524 can be made to rotate along the arc-shaped rack 3527, and the mating convex shaft 3525 rotates synchronously with the transmission gear 3524 and generates a horizontal acting force on the spiral groove 3526. Since the pulling rod 3521 can only slide horizontally, as the mating convex shaft 3525 slides in the spiral groove 3526, the pulling rod 3521 can be driven to contract into the sleeve 3522. In this way, the contraction action of the pulling rod 3521 is achieved. After the transmission gear 3524 separates from the arc-shaped rack 3527, under the elastic force of the return spring 3523, the pulling rod 3521 slides back to its original position, and the transmission gear 3524 rotates back to its original position under the action of the mating convex shaft 3525 sliding in cooperation with the spiral groove 3526.

[0060] Please refer to Figure 3 and Figure 7, the contraction driving member is an arc surface extrusion structure, including a driving motor 3531 and two mating gears 3532. The driving motor 3531 is fixed on the mechanical support member 1. One of the mating gears 3532 is fixed to the rotating end of the driving motor 3531, and the other mating gear 3532 is fixed to the rotating end of the swing arm 354. The two mating gears 3532 are meshed with each other. The diameter of the mating gear 3532 connected to the driving motor 3531 is at least twice the diameter of the other mating gear 3532, so that a rotational speed difference is formed between the two. When the rotary driving assembly 353 drives the swing arm 354 to swing, by rotating the driving motor 3531, the two mating gears 3532 can rotate synchronously, and the swing arm 354 will rotate slowly synchronously with the mating gear 3532.

[0061] In this embodiment, the contraction driving member uses a transmission gear 3524, a mating convex shaft 3525, and a spiral groove 3526, combined with an arc-shaped rack 3527 as the unlocking part. This mechanical transmission method may have the advantage of a stable structure, providing precise control through the meshing of gears and racks, and is suitable for occasions requiring high reliability and repeatability. At the same time, the cooperation between the spiral groove 3526 and the convex shaft can convert the rotational motion into a linear motion to realize the contraction of the pulling rod 3521. This mechanical structure may have advantages in terms of durability and maintenance. Without electronic components, it is suitable for harsh environments.

[0062] Please refer to Figure 1 , Figure 8 and Figure 9 , the active vibration isolation component 2 includes: a rigid base 22, an active noise reduction unit 23, and an impact platform 24. The measured ground foundation 21 is embedded in the laboratory working ground. The rigid base 22 can be made of steel, which is fixed to the measured ground foundation 21, and there is a vibration isolation groove 25 between the two; the active noise reduction unit 23 is arranged between the rigid base 22 and the measured ground foundation 21. The active noise reduction unit 23 measures the vibration noise from one side of the measured ground foundation 21 through an acoustic monitoring device. After amplifying the noise through a negative feedback amplifier, it generates a reverse and equal-amplitude vibration according to the vibration frequency with the same vibration amplitude and a 90-degree phase deviation to cancel the vibration interference from one side of the ground measured ground foundation 21. The active noise reduction unit 23 is fixed between the rigid base 22 and the measured ground foundation 21, and the impact platform 24 is fixed on the top of the rigid base 22.

[0063] Please refer to Figure 10, the mechanical support component 1 includes: a main frame body 11, a sliding seat 12, and a support frame 13. The sliding support frame 13 is slidably mounted on the main frame body 11. Both sides of the sliding seat 12 are fixed to the main frame body 11 through locking rotating rods 14. The support frame 13 is slidably mounted on the sliding seat 12 and is fixed to the sliding seat 12 through the locking rotating rod 14. By respectively rotating the locking rotating rods 14 on the sliding seat 12 and the support frame 13, their locking functions can be released, and then the height of the sliding seat 12 and the horizontal length of the support frame 13 can be adjusted to meet different usage requirements. The top end of the guide rod 33 is threadedly mounted on the support frame 13.

[0064] Please refer to Figure 1 , Figure 8 and Figure 10 , the measuring component 4 includes: a foldable and retractable mounting frame 41, a dynamic deformation modulus sensor 42, a force sensor 43, a strain network component 44, and three displacement sensors 45. The mounting frame 41 is fixed to the bottom of the main frame body 11. The dynamic deformation modulus sensor 42 is detachably mounted on the top of the stamping platform. The top of the dynamic deformation modulus sensor 42 is in contact with the bottom of the waveform generator 31. The force sensor 43 is mounted at one end of the impact hammer 34. The strain network component 44 is composed of four strain gauges, and the four strain gauges are evenly arranged at the four vertex positions on the same plane of the impact platform 24. The strain network component 44 is used to dynamically measure the distribution of the strain generated by the measured dynamic deformation modulus sensor 42 acting on the impact platform 24 in real time; the three displacement sensors 45 are evenly and equidistantly arranged on the mounting frame 41, and they are used to dynamically measure the deformation amounts generated at three positions on the surface of the measured dynamic deformation modulus sensor 42.

[0065] Please refer to Figure 7 and Figure 10 , a winding wheel 355 is fixed to one side of the sliding frame. The top end of the flexible connecting member 351 is wound around the winding wheel 355. After the height of the sliding seat 12 changes, the upper end of the flexible connecting member 351 can be wound around the winding wheel 355 to achieve synchronous adjustment of the flexible connecting member 351.

[0066] Embodiment 2

[0067] Please refer to Figure 11 and Figure 12, as another implementation of the contraction driving member, the difference from the first embodiment is that: the contraction driving member is an arc surface extrusion structure, including an extrusion inclined block 3528, a support spring 3529, and a compression inclined groove 35210 that cooperates with the extrusion inclined block 3528 to slide. The support spring 3529 is fixed between the extrusion inclined block 3528 and the sleeve 3522. The extrusion inclined block 3528 is slidably installed at the end of the sleeve 3522. The compression inclined groove 35210 is arranged on the pulling rod 3521. The end of the extrusion inclined block 3528 away from the sleeve 3522 is arc-shaped, and the unlocking part is a contact plate 35211 with an arc surface.

[0068] When the above-mentioned contraction driving member is in use, the extrusion inclined block 3528 starts to contact the arc surface of the contact plate 35211. As the swing arm 354 continues to rotate, the contact plate 35211 can generate an extrusion force on the extrusion inclined block 3528, thereby pushing the extrusion inclined block 3528 to slide on the sleeve 3522. The support spring 3529 is compressed by the extrusion inclined block 3528 and contracts. The extrusion inclined block 3528 can generate a thrust on the pulling rod 3521 by cooperating with the compression inclined groove 35210 to slide, causing the pulling rod 3521 to start to contract into the sleeve 3522. When the extrusion inclined block 3528 is separated from the arc surface of the contact plate 35211, the extrusion inclined block 3528 is no longer subjected to the extrusion force and is reset under the elastic force of the support spring 3529, and the pulling rod 3521 is also reset under the elastic force of the reset spring 3523. In this way, the automatic contraction and reset actions of the pulling rod 3521 are also realized.

[0069] In this embodiment, the contraction driving member is changed to an extrusion inclined block 3528, a support spring 3529, and a compression inclined groove 35210, and the unlocking part is a contact plate 35211 with an arc surface. This purely mechanical structure may be simpler, with fewer parts and lower costs. The design of the arc surface can directly trigger contraction through physical contact, with a fast response speed and a compact structure. The addition of the support spring 3529 enables the reset process to be completed automatically, reducing complexity while maintaining reliability, and may perform better in scenarios that require rapid release and high-frequency operations.

[0070] Embodiment Three

[0071] Please refer to Figure 13 and Figure 14 , as another implementation of the contraction driving member, the difference from the first embodiment is that: the contraction driving member is an arc surface extrusion structure, including an electromagnet 35212, a conductive switch 35213, and a magnetic sheet 35214. The electromagnet 35212 is fixed at the end of the sleeve 3522. The magnetic sheet 35214 is fixed at one end of the pulling rod 3521 close to the electromagnet 35212. The conductive switch 35213 is used to control the on-off of the electromagnet 35212, and the unlocking part is an infrared sensor that is signal-connected to the conductive switch 35213.

[0072] When the above-mentioned contraction driving member is in use, after the pulling rod 3521 follows the swing arm 354 to move to the position of the infrared sensor, the infrared sensor detects the position of the pulling rod 3521 and sends a signal to the control system. The control system sends a power-on signal to the conductive switch 35213, causing the electromagnet 35212 to start being powered on and generate a magnetic force, which generates an attractive force on the magnetic sheet 35214, thereby driving the pulling rod 3521 to contract into the sleeve 3522.

[0073] In this embodiment, an electromagnet 35212, a conductive switch 35213 and a magnetic sheet 35214 are adopted, and the unlocking part is an infrared sensor. This solution uses electromagnetic force to achieve contraction, which belongs to the electronic control method. The advantages are precise control, automatic triggering can be achieved through sensors, physical contact is not required, mechanical wear is reduced, and service life is extended. In addition, the reaction speed of the electromagnet 35212 is fast, which is suitable for applications that require high-precision timing release, and is easy to integrate into modern automation systems, and may be more suitable for laboratory environments that require remote control or programmed operation.

[0074] As can be seen from the above, Embodiment 1 takes the reliability of mechanical transmission as the core, and through the force transmission of gear-rack meshing and spiral grooves, ensures that the contraction action of the pulling rod is accurately controllable, especially suitable for long-term high-intensity tests; Embodiment 2 optimizes the economy and response speed of the arc surface structure, realizes millisecond-level release while reducing costs, and meets the cost performance requirements of conventional laboratories; Embodiment 3 relies on the intelligence and precision of electromagnetic drive, breaks through the mechanical contact limit, and realizes micron-level trigger synchronization, providing data consistency guarantee for the research of material dynamic performance. The three solutions disclosed in the present invention respectively cover the application requirements of heavy-duty durability, economic efficiency and intelligent precision, forming a multi-level technical coverage.

[0075] The above describes the embodiments of the specific implementation manner, but this embodiment is not limited to the above specific implementation manner. The above specific implementation manner is only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A dynamic deformation modulus tester, characterized in that, Comprising: Mechanical support component; Active vibration isolation component for suppressing external vibration interference; Load generating component, which includes: Guide rod, the bottom end of which is fixed to the damping component and the top end is fixed to the mechanical support component; Impact hammer, which is slidably sleeved outside the guide rod; Automatic lifting mechanism, including: flexible connecting piece, pulling component and rotary driving component, the flexible connecting piece connects the impact hammer and the mechanical support component, the driving end of the rotary driving component is connected with a swing arm, the pulling component includes a retractable pulling contact part arranged at the end of the swing arm and an unlocking part for triggering the contraction of the pulling contact part, when the rotary driving component drives the swing arm to swing to a preset position, the unlocking part triggers the pulling contact part to contract to release the flexible connecting piece, so that the impact hammer freely falls along the guide rod; Measuring component for real-time monitoring of the dynamic deformation parameters of the material under test under impact load.

2. The dynamic deformation modulus tester according to claim 1, wherein The pulling contact part includes a pulling rod, a sleeve, a return spring and a contraction driving part, the sleeve is slidably sleeved outside the pulling rod, and its outside is fixed to the end of the swing arm; the return spring connects the pulling rod and the sleeve, and the contraction driving part drives the pulling rod to retract into the sleeve by cooperating with the unlocking part.

3. The dynamic deformation modulus tester according to claim 2, characterized in that, The contraction driving part is a gear transmission structure, including a transmission gear, a matching convex shaft and a spiral groove, the transmission gear is rotatably installed at the end of the sleeve, the matching convex shaft is fixed inside the transmission gear, the spiral groove is arranged outside the pulling rod and slidably cooperates with the matching convex shaft, and the unlocking part is an arc-shaped rack with the center of the circle coinciding with the rotation center of the swing arm.

4. The dynamic deformation modulus tester according to claim 2, characterized in that, The contraction driving part is an arc surface extrusion structure, including an extrusion inclined block slidably installed at the end of the sleeve and a compression inclined groove arranged on the pulling rod, the extrusion inclined block is connected with the sleeve through a support spring, the unlocking part is a contact plate with an arc surface, and the arc surface of the contact plate pushes the extrusion inclined block into the compression inclined groove to drive the pulling rod to contract.

5. The dynamic deformation modulus tester according to claim 2, characterized in that, The contraction driving part is an electromagnetic driving structure, including an electromagnet arranged in the sleeve, a magnetic sheet arranged at the end of the pulling rod, a conductive switch arranged on the sleeve and an infrared sensor for triggering the electromagnet to be energized; when the swing arm rotates to the detection position of the infrared sensor, the electromagnet adsorbs the magnetic sheet to make the pulling rod contract.

6. The dynamic deformation modulus tester according to claim 1, characterized in that, The rotary driving component includes a driving motor and a large and small gear set that mesh with each other, the driving end of the driving motor is connected with the large and small gear set, and the diameter of the large gear is at least twice that of the small gear to reduce the swing speed of the swing arm.

7. A dynamic deformation modulus tester according to claim 1, characterized in that, The active vibration isolation component includes a rigid base and an active noise reduction unit, and the active noise reduction unit generates reverse vibration to cancel the noise transmitted by the foundation.

8. The dynamic deformation modulus tester according to claim 1, wherein, The mechanical support component includes an adjustable-height sliding seat and a telescopic support frame, and the top end of the guide rod is threadedly connected with the support frame.

9. The dynamic deformation modulus tester according to claim 1, wherein The measuring component includes: a foldable and retractable mounting rack, a dynamic deformation modulus sensor, a force sensor installed on the impact hammer, a strain network component arranged at the four corners of the impact platform, and three equally spaced displacement sensors.

10. The dynamic deformation modulus tester according to claim 1, characterized in that, The sliding seat is provided with a winding wheel for winding the flexible connecting piece to adapt to different impact heights.

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