A dynamic deformation modulus tester

Abstract

The present invention relates to the technical field of mechanical property testing of civil engineering materials, and discloses a dynamic deformation modulus tester, comprising: a mechanical support component; an active vibration isolation component for suppressing external vibration interference; a load generating component, which comprises: a guide rod, the bottom end of which is fixed to a damping component, and the top end is fixed to the mechanical support component; an impact hammer, which is slidably sleeved on the outside of the guide rod; and an automatic lifting mechanism, comprising: a flexible connector, a pulling assembly, and a rotary drive assembly. The automatic lifting mechanism of the present invention drives the swing arm to swing through the rotary drive assembly, and combines the pulling assembly with the flexible connector to achieve a full-process automated action of lifting and releasing the impact hammer. The automatic lifting mechanism controls the movement of the swing arm through the rotary drive assembly, accurately pulls the flexible connector to complete the lifting of the impact hammer, and triggers the unlocking part at a preset height to release the impact hammer, completely solving the problems of low efficiency and high labor intensity of manual operation.

Description

Technical Field

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

[0002] The dynamic deformation modulus tester (also known as the drop-weight deflectometer) is a core device for evaluating the dynamic bearing capacity of materials such as soil and roadbed. It simulates the stress-strain response of the material under impact loads and calculates the dynamic deformation modulus (Evd), providing critical data for civil engineering quality inspections and rail transit roadbed assessments. Traditional drop-weight deflectometers typically operate manually, applying dynamic loads by manually lifting and releasing the impact hammer, while sensors collect deformation data. While this type of equipment demonstrates strong environmental adaptability in field engineering applications, its design characteristics significantly conflict with laboratory testing requirements.

[0003] In laboratory settings, studying the dynamic mechanical properties of materials requires frequent, repetitive impact testing of the same specimen to obtain statistically reliable parameters. However, existing manual equipment has the following limitations: low operational efficiency. Each test requires manual lifting, securing, and releasing of the hammer, which places heavy workload on the experimenter and makes continuous testing difficult. Manual operation can introduce human error, leading to slight deviations in the hammer's release height and posture, affecting the consistency of load application and comparability of test results. Inadequate automation and a lack of programmable control over test frequency and impact energy make it difficult to simulate complex working conditions (such as multi-stage loads and variable-rate impacts). While some attempts at automation have been made in the prior art, such as the use of a motor-driven chain lift mechanism, these mechanisms are complex, have high failure rates, and struggle to address vibration interference at the moment of hammer release. Therefore, there is an urgent need for a dynamic deformation modulus tester suitable for laboratory settings that can automate the entire hammer lifting and release process while ensuring measurement accuracy, reducing manual intervention and meeting the requirements for high-frequency, high-consistency testing. 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 technical problems through the following technical solutions:

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

[0007] Mechanical support components;

[0008] Active vibration isolation components to suppress external vibration interference;

[0009] A load generating component comprising:

[0010] A guide rod, the bottom end of which is fixed to the damping member, and the top end of which is fixed to the mechanical support member;

[0011] An impact hammer is slidably sleeved on the outside of the guide rod;

[0012] An automatic lifting mechanism includes: a flexible connector, a pulling assembly, and a rotary drive assembly. The flexible connector connects the impact hammer and the mechanical support component. The driving end of the rotary drive assembly is connected to a swing arm. The pulling assembly includes a retractable pulling contact portion provided at the end of the swing arm and an unlocking portion that triggers the retraction of the pulling contact portion. When the rotary drive assembly drives the swing arm to swing to a preset position, the unlocking portion triggers the retraction of the pulling contact portion to release the flexible connector, allowing the impact hammer to fall freely along the guide rod.

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

[0014] As a further optimization scheme of the present invention, the pulling contact part includes a pulling rod, a sleeve, a reset spring and a retraction drive part. The sleeve is slidably mounted on the outside of the pulling rod, and its outer side is fixed to the end of the swing arm; the reset spring connects the pulling rod and the sleeve, and the retraction drive part cooperates with the unlocking part to drive the pulling rod to retract into the sleeve.

[0015] As a further optimization scheme of the present invention, the retraction drive member is a gear transmission structure, including a transmission gear, a mating cam and a spiral groove. The transmission gear is rotatably installed on the end of the sleeve, the mating cam is fixed on the inner side of the transmission gear, the spiral groove is arranged on the outer side of the pulling rod and slidingly cooperates with the mating cam, and the unlocking part is an arc-shaped rack whose center of circle coincides with the rotation center of the swing arm.

[0016] As a further optimization scheme of the present invention, the contraction drive member is an arc-surface extrusion structure, including an extrusion bevel block slidably installed on the end of the sleeve and a pressure bevel groove provided on the pulling rod. The extrusion bevel block is connected to the sleeve through a support spring, and the unlocking part is a contact plate with an arc-surface. The arc-surface of the contact plate pushes the extrusion bevel block to slide into the pressure bevel groove, driving the pulling rod to contract.

[0017] As a further optimization scheme of the present invention, the contraction drive component is an electromagnetic drive structure, including an electromagnet arranged in the sleeve, a magnetic sheet arranged at the end of the pull rod, a conductive switch arranged on the sleeve, and an infrared sensor that triggers the electromagnet to be energized; when the swing arm rotates to the infrared sensor detection position, the electromagnet attracts the magnetic sheet to cause the pull rod to contract.

[0018] As a further optimization scheme of the present invention, the rotation drive assembly includes a drive motor and a large and small gear set that mesh with each other. The driving end of the drive 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. 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 solution 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 a rotary drive assembly, and combines the pulling assembly with the flexible connector to achieve a fully automated process of lifting and releasing the impact hammer. The automatic lifting mechanism controls the movement of the swing arm through the rotary drive assembly, 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, completely solving the problems of low manual operation efficiency and high labor intensity. Secondly, the guide rod limit and wire rope margin design ensure that the impact hammer falls freely along a fixed trajectory, eliminating the height deviation caused by manual release and ensuring uniform load application. In addition, the rotary drive assembly supports 360° circular operation, and with the adjustable speed gear set, the impact frequency can be programmably controlled to meet the laboratory's high-frequency repeated testing requirements. 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 This 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 This invention Figure 3 A partial enlarged schematic diagram of point A in the middle;

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

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

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

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

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

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

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

[0036] Figure 12 is a cross-sectional view of a local position of the sleeve in the second embodiment of the present invention;

[0037] Figure 13 1 is a structural diagram of a third embodiment of a dynamic deformation modulus tester provided by the present invention;

[0038] Figure 14 It is a cross-sectional view of a local position of the sleeve in the third embodiment of the present invention.

[0039] In the picture:

[0040] 1. Mechanical support components;

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

[0042] 2. Active vibration isolation components;

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

[0044] 3. Load generating components;

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

[0046] 351. Flexible connector;

[0047] 352, pulling assembly; 3521, pulling rod; 3522, sleeve; 3523, return spring; 3524, transmission gear; 3525, mating cam; 3526, spiral groove; 3527, arc-shaped rack; 3528, extrusion bevel; 3529, support spring; 35210, pressure bevel; 35211, contact plate; 35212, electromagnet; 35213, conductive switch; 35214, magnetic sheet;

[0048] 353, rotary drive assembly; 3531, drive motor; 3532, mating gear; 354, swing arm; 355, winding wheel;

[0049] 4. Measuring components;

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

[0051] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0052] Example 1

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

[0054] For more details, please refer to Figure 2 and Figure 3 The automatic lifting mechanism 35 includes: a flexible connector 351, a pulling assembly 352 and a rotation drive assembly 353. The impact hammer 34 is fixed to the mechanical support component 1 through the flexible connector 351. The flexible connector 351 can be a steel wire rope, and the length of the steel wire rope must not be completely straightened after the impact hammer 34 is in the lowest position. A certain margin must be ensured to avoid affecting the free fall movement of the impact hammer 34. The use of a steel wire rope can also prevent it from having excessive free movement during the pulling process, reducing the possibility of it falling off from the pulling assembly 352. The driving end of the rotation drive assembly 353 is connected to the swing arm 354, and the pulling assembly 352 includes a pulling contact portion for applying an upward pulling force to the hanging flexible connector 351 and an unlocking portion for triggering the contraction of the pulling contact portion. The pulling contact portion is arranged at the end of the swing arm 354, and the unlocking portion is arranged at a preset swing position of the swing arm 354. After the rotation drive assembly 353 drives the swing arm 354 to swing to the preset position, the unlocking portion drives the pulling contact portion to contract, thereby releasing the flexible connector 351.

[0055] Please refer to Figures 1 to 3It should be noted that when the above-mentioned 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 connection member 351 is in a naturally hanging state, and the swing arm 354 is kept flush with the flexible connection member 351, and the pulling contact portion is in contact with the outer side of the flexible connection member 351. By starting the rotation drive component 353, the swing arm 354 can be driven to start rotating upward, and the pulling contact portion moves with the swing arm 354 and generates an upward pulling force on the flexible connection member 351. The impact hammer 34 is subjected to the pulling force of the flexible connection member 351 and begins to move slowly upward along the guide rod 33. When the impact hammer 34 moves up to a preset height, the pulling contact portion just moves and contacts with the unlocking portion. At this time, the rotation drive component 353 continues to drive the swing arm 354 to rotate downward, so that the unlocking portion drives the pulling contact portion The contact portion contracts, separating it from the flexible connector 351 and releasing the flexible connector 351. At this point, the hammer 34 loses the pulling force of the flexible connector 351 and, under its own weight, begins to move downward along the guide rod 33. It contacts the damping member 32 below and collides with the active vibration isolation component 2. The damping member 32 dampens the force exerted by the hammer 34, preventing it from bouncing upward too high. During the hammer's descent, the measuring component 4 records the required dynamic deformation modulus parameters in real time. The rotary drive assembly 353 then rotates the swing arm 354 360 degrees before stopping. After falling, the hammer 34 comes to rest, allowing the flexible connector 351 to return to its naturally drooped state and contact the pulling contact portion, completing a test. In this way, the automatic lifting mechanism 35 automatically lifts and releases the hammer 34, replacing traditional manual operation. This significantly reduces the workload for labs that require frequent repetitive testing. In addition, the rotation speed and frequency of the rotary drive assembly 353 can be controlled to achieve multiple consecutive test operations. The test mode is more flexible and can meet a variety of different test requirements.

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

[0057] When the pull contact portion is in contact with the unlocking portion, the contraction drive member begins to generate a horizontal pulling force on the pulling rod 3521, causing the pulling rod 3521 to begin to slide and contract toward the inside of the sleeve 3522, and the return spring 3523 is squeezed and contracted synchronously. Since both ends of the flexible connection member 351 are fixed, it is in a tensioned state and will not be excessively driven by the pulling rod 3521. As the pulling rod 3521 gradually contracts and eventually separates from the pulling rod 3521, the flexible connection member 351 is released at this time, and under the action of the gravity of the impact hammer 34, the flexible connection member 351 can be driven to stretch out. Since the flexible connection member 351 is in a relaxed state, it will not cause any obstruction to the impact hammer 34, and the impact hammer 34 can slide down freely. When the pulling contact portion is separated from the unlocking portion, the pulling rod 3521 loses the pulling force of the contraction drive member 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 parts are a transmission gear 3524, a mating cam 3525 and a spiral groove 3526 that slides with the mating cam 3525. The transmission gear 3524 is rotatably installed on the end of the sleeve 3522, the mating cam 3525 is fixed on the inner side of the transmission gear 3524, the spiral groove 3526 is arranged on the outer side of the pulling rod 3521, and the unlocking part is an arc-shaped rack 3527 whose center coincides with the rotation center of the swing arm 354.

[0059] When the gear 3524 is in the locked state, the cam 3525 is in the locked state and the gear 3526 is in the locked state.

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

[0061] In this embodiment, the retraction drive utilizes a transmission gear 3524, a mating cam 3525, and a helical groove 3526, with an arcuate rack 3527 serving as the unlocking mechanism. This mechanical transmission method may offer advantages in its robust structure, providing precise control through the meshing of the gear and rack, making it suitable for applications requiring high reliability and repeatability. Furthermore, the coordination between the helical groove 3526 and the cam converts rotational motion into linear motion, achieving retraction of the pull rod 3521. This mechanical structure may also offer advantages in durability and maintenance, lacking electronic components and being 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 foundation 21 is embedded in the laboratory work floor. The rigid base 22 can be made of steel, which is fixed to the measured foundation 21, and a vibration isolation groove 25 is provided between the two; the active noise reduction unit 23 is arranged between the rigid base 22 and the measured foundation 21. The active noise reduction unit 23 measures the vibration noise from one side of the measured foundation 21 through an acoustic monitoring device, and amplifies the noise through a negative feedback amplifier. It generates reverse and equal-amplitude vibration at a vibration frequency with the same vibration amplitude and a 90-degree phase deviation to offset the vibration interference from the side of the measured foundation 21 on the ground. The active noise reduction unit 23 is fixed between the rigid base 22 and the measured foundation 21, and the impact platform 24 is fixed on the top of the rigid base 22.

[0063] Please refer to Figure 10The mechanical support component 1 includes: a main frame 11, a sliding seat 12 and a support frame 13. The sliding support frame 13 is slidably installed on the main frame 11. Both sides of the sliding seat 12 are fixed to the main frame 11 by locking rods 14. The support frame 13 is slidably installed on the sliding seat 12. The support frame 13 is fixed to the sliding seat 12 by the locking rod 14. The locking rod 14 on the sliding seat 12 and the support frame 13 can be rotated respectively to release the locking effect, 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 of the guide rod 33 is threadedly installed with 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 11, and 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 on one end of the impact hammer 34. The strain network component 44 is composed of four strain gauges, which are evenly arranged at the four vertex positions of the same plane of the impact platform 24. The strain network component 44 is used to dynamically measure the distribution of the strain of the 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, which are used to dynamically measure the deformation generated at three positions on the surface of the dynamic deformation modulus sensor 42 being measured.

[0065] Please refer to Figure 7 and Figure 10 A winding wheel 355 is fixed to one side of the sliding frame, and the top end of the flexible connecting member 351 is wound around the winding wheel 355. When 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] Example 2

[0067] Please refer to Figure 11 and Figure 12, as another embodiment of the contraction drive member, the difference from Example 1 is that: the contraction drive member is an arc-surface extrusion structure, including an extrusion bevel block 3528, a support spring 3529 and a pressure bevel groove 35210 that slides with the extrusion bevel block 3528, the support spring 3529 is fixed between the extrusion bevel block 3528 and the sleeve 3522, the extrusion bevel block 3528 is slidably installed on the end of the sleeve 3522, the pressure bevel groove 35210 is set on the pulling rod 3521, the end of the extrusion bevel 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 drive component is in use, the extrusion bevel 3528 begins 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 bevel 3528, thereby pushing the extrusion bevel 3528 to slide on the sleeve 3522. The support spring 3529 is squeezed and contracted by the extrusion bevel 3528. The extrusion bevel 3528 can generate a thrust on the pull rod 3521 by sliding in cooperation with the pressure bevel groove 35210, causing the pull rod 3521 to begin to contract into the sleeve 3522. When the extrusion bevel 3528 separates from the arc surface of the contact plate 35211, the extrusion bevel 3528 is no longer squeezed and is reset under the elastic force of the support spring 3529, and the pull rod 3521 is also reset under the elastic force of the reset spring 3523. In this way, the automatic contraction and reset action of the pull rod 3521 is also achieved.

[0069] In this embodiment, the retraction driver is replaced with an extrusion bevel block 3528, a support spring 3529, and a pressure-bearing bevel slot 35210, and the unlocking element is a contact plate 35211 with a curved surface. This purely mechanical structure may be simpler, with fewer parts and lower cost. The curved surface design can directly trigger retraction through physical contact, resulting in a fast response and a compact structure. The addition of the support spring 3529 automates the resetting process, reducing complexity while maintaining reliability, potentially facilitating faster release and high-frequency operation.

[0070] Example 3

[0071] Please refer to Figure 13 and Figure 14 As another embodiment of the retraction drive member, the difference from Example 1 is that the retraction drive 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 to the end of the sleeve 3522, and the magnetic sheet 35214 is fixed to the end of the pull rod 3521 close to the electromagnet 35212. The conductive switch 35213 is used to control the power on and off of the electromagnet 35212. The unlocking part is an infrared sensor connected to the signal of the conductive switch 35213.

[0072] When the above-mentioned retraction drive component is in use, after the pulling rod 3521 follows the swing arm 354 to move to the infrared sensor position, 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, so that the electromagnet 35212 starts to be energized and generates magnetic force, which produces an attraction force on the magnetic sheet 35214, thereby driving the pulling rod 3521 to retract into the sleeve 3522.

[0073] In this embodiment, an electromagnet 35212, a conductive switch 35213, and a magnetic sheet 35214 are used, with an infrared sensor as the unlocking element. This solution utilizes electromagnetic force to achieve contraction and is an electronically controlled method. Its advantages lie in precise control, automated triggering via sensors without the need for physical contact, reducing mechanical wear and extending service life. Furthermore, the electromagnet 35212 offers a fast response speed, making it suitable for applications requiring highly precise timed release. It is also easily integrated into modern automated systems and may be more suitable for laboratory environments requiring remote control or programmed operation.

[0074] As can be seen from the above, the first embodiment takes the reliability of mechanical transmission as the core, and ensures the precise and controllable contraction of the pull rod through the meshing of the gear rack and the force transmission of the spiral groove, which is particularly suitable for long-term high-intensity testing; the second embodiment optimizes the economy and response speed of the arc surface structure, while reducing costs and achieving millisecond-level release, meeting the cost-effectiveness requirements of conventional laboratories; the third embodiment relies on the intelligence and precision of electromagnetic drive to break through the limitations of mechanical contact and achieve micron-level trigger synchronization, providing data consistency guarantee for the study of dynamic properties of materials. The three solutions disclosed in the present invention respectively cover the application requirements of heavy-duty durability, economic efficiency and intelligence and precision, forming a multi-level technical coverage.

[0075] The above describes an embodiment of this specific implementation method, but this embodiment is not limited to the above specific implementation method. The above specific implementation method is merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. A dynamic deformation modulus tester, characterized in that: include: Mechanical support components; Active vibration isolation components to suppress external vibration interference; A load generating component comprising: A guide rod, the bottom end of which is fixed to the damping member, and the top end of which is fixed to the mechanical support member; An impact hammer is slidably sleeved on the outside of the guide rod; An automatic lifting mechanism includes: a flexible connector, a pulling assembly, and a rotary drive assembly. The flexible connector connects the impact hammer and the mechanical support component. The driving end of the rotary drive assembly is connected to a swing arm. The pulling assembly includes a retractable pulling contact portion provided at the end of the swing arm and an unlocking portion that triggers the retraction of the pulling contact portion. When the rotary drive assembly drives the swing arm to swing to a preset position, the unlocking portion triggers the retraction of the pulling contact portion to release the flexible connector, allowing the impact hammer to fall freely along the guide rod. The measuring component is used to monitor the dynamic deformation parameters of the measured material under impact load in real time.

2. A dynamic deformation modulus tester according to claim 1, characterized in that: The pulling contact part includes a pulling rod, a sleeve, a return spring and a retraction drive member. The sleeve is slidably mounted on the outside of the pulling rod, and its outer side is fixed to the end of the swing arm; the return spring connects the pulling rod and the sleeve, and the retraction drive member drives the pulling rod to retract into the sleeve by cooperating with the unlocking part.

3. A dynamic deformation modulus tester according to claim 2, characterized in that: The retraction drive member is a gear transmission structure, including a transmission gear, a mating cam and a spiral groove. The transmission gear is rotatably installed on the end of the sleeve, the mating cam is fixed on the inner side of the transmission gear, the spiral groove is arranged on the outer side of the pulling rod and slidingly cooperates with the mating cam, and the unlocking part is an arc-shaped rack whose center of circle coincides with the rotation center of the swing arm.

4. A dynamic deformation modulus tester according to claim 2, characterized in that: The contraction drive member is an arc-surface extrusion structure, comprising an extrusion bevel block slidably mounted on the end of the sleeve and a pressure-bearing bevel groove provided on the pulling rod. The extrusion bevel block is connected to the sleeve through a supporting spring. The unlocking part is a contact plate with an arc-surface. The arc-surface of the contact plate pushes the extrusion bevel block to slide into the pressure-bearing bevel groove, driving the pulling rod to contract.

5. A dynamic deformation modulus tester according to claim 2, characterized in that: The retraction drive component is an electromagnetic drive structure, including an electromagnet arranged in a sleeve, a magnetic sheet arranged at the end of the pull rod, a conductive switch arranged on the sleeve, and an infrared sensor that triggers the electromagnet to energize; when the swing arm rotates to the infrared sensor detection position, the electromagnet attracts the magnetic sheet to cause the pull rod to retract.

6. A dynamic deformation modulus tester according to claim 1, characterized in that: The rotary drive assembly includes a drive motor and a large and small gear set that mesh with each other. The drive end of the drive 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.

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. The active noise reduction unit generates reverse vibration to offset the noise transmitted by the foundation.

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

9. A dynamic deformation modulus tester according to claim 1, characterized in that: The measuring components include: a foldable and retractable mounting frame, a dynamic deformation modulus sensor, a force sensor installed on the impact hammer, strain network components arranged at the four corners of the impact platform, and three equidistantly distributed displacement sensors.

10. A dynamic deformation modulus tester according to claim 8, 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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