Portable medium strain rate impact device and application thereof

Abstract

The invention discloses a portable medium strain rate impact device, which comprises a supporting mechanism, an impact mechanism and a test system, and is characterized in that the supporting mechanism comprises a human-shaped bracket, a human-shaped guide rail arranged on the human-shaped bracket, and a first electric slide block and a second electric slide block arranged at two ends of the human-shaped guide rail; the impact mechanism comprises a hydraulic telescopic device arranged on the first electric sliding block, a launching cylinder frame arranged on the second electric sliding block, a plurality of clamping grooves formed in the two sides of the launching cylinder frame, an elastic piece fixedly connected to the inner end of the launching cylinder frame, a connecting column fixedly connected to the elastic piece and a baffle ring rotationally connected to the connecting column. The lifting assembly is arranged at the side end of the launching cylinder frame and used for detaching bullets installed in the launching cylinder frame. The invention provides the impact loading device which has the functions of energy storage and release, is convenient to mount and dismount and adapts to multi-scene application, and the test efficiency, the operation convenience and the field applicability are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the field of geotechnical dynamics tests, and particularly relates to a portable medium strain rate impact device and its application. Background Art

[0002] Research shows that the strain rate of rocks varies significantly under different impact loads, and the strain rate is a key factor affecting the mechanical properties of rocks. To study the mechanical response of rocks under different strain rates, it is urgent to develop a test device that can simulate multi-strain rate loading conditions. Currently, most research focuses on low strain rates and high strain rates, using devices such as universal testing machines and Hopkinson pressure bars respectively, while the research on the medium strain rate range is relatively scarce. This strain rate range is precisely the critical stage for materials to transition from strain rate insensitivity to sensitivity, with important scientific research value and application prospects.

[0004] To fill this research gap, it is crucial to develop a rock mechanics test device suitable for medium strain rate conditions. Some existing medium strain rate test devices, such as pendulum devices, cam loading mechanisms, and servo hydraulic testing machines, although they can be used for impact loading tests, generally have many deficiencies. For example, they rely on manual operation, have a large volume, heavy mass, poor portability, complex structures, and often require special processing of specimens or devices before use, which limits their application and promotion in multiple scenarios.

[0005] Therefore, the present invention provides a portable medium strain rate impact device and its application. Summary of the Invention

[0006] The present invention designs a portable medium strain rate impact device to solve the problems existing in the above background art.

[0007] To achieve the above technical effects, the present invention is realized through the following technical solutions: A portable medium strain rate impact device includes a support mechanism, an impact mechanism, and a test system.

[0008] Further, the support mechanism includes a humanoid support frame, a humanoid guide rail arranged on the humanoid support frame, a first electric slider and a second electric slider arranged at both ends of the humanoid guide rail; the impact mechanism includes a hydraulic telescopic device arranged on the first electric slider, a launch tube frame arranged on the second electric slider, a plurality of card slots arranged on both sides of the launch tube frame, an elastic member fixedly connected to the inner end of the launch tube frame, a connecting column fixedly connected to the elastic member, a retaining ring rotatably connected to the connecting column, a lifting assembly arranged at the side end of the launch tube frame, and a bullet detachably installed in the launch tube frame.

[0009] Further, locking components are arranged on both sides of the hydraulic telescopic device, and the telescopic rod of the hydraulic telescopic device cooperates with the launch tube frame.

[0010] Furthermore, sliding grooves are provided on both sides of the launcher rack, and a plurality of fixing rods are provided on both sides of the port of the launcher rack. The locking component is detachably connected to the fixing rods.

[0011] Furthermore, the card slots include a plurality of upper card slots provided at the upper end of one side sliding groove and a plurality of lower card slots provided at the lower end of the other side sliding groove. Roller members are provided on the side walls of the upper card slots and the lower card slots.

[0012] Furthermore, limiting rods are provided on both sides of the retaining ring, and the limiting rods are detachably connected to the card slots.

[0013] Furthermore, the lifting component includes a slide rail rack fixedly connected to the side end of the launcher rack, a limiting slider fitted and connected to the slide rail rack, an electric lifting rod fixedly connected to the limiting slider, and a push block fixedly connected to the telescopic end of the electric lifting rod.

[0014] Furthermore, the test system includes a test piece, an incident rod and a transmission rod respectively provided on both sides of the test piece, and an absorption rod provided at the side end of the transmission rod. The incident rod, the transmission rod and the absorption rod are arranged on a fatigue testing machine.

[0015] Furthermore, the first electric slider, the second electric slider, the hydraulic telescopic device, the electric lifting rod, and the test system are electrically connected to an external signal control component.

[0016] The beneficial effects of the present invention are as follows:

[0017] In the present invention, the hydraulic telescopic device can automatically move to the position of the launcher rack and compress the elastic member in the launcher rack to a predetermined energy. At the same time, by inserting the limiting rods of the retaining ring into the upper and lower card slots, the storage and position locking of energy are realized, so as to realize the precise control of the impact energy storage and release process. Subsequently, the launcher rack can automatically move to the position of the incident rod of the test system. The push block is driven by the electric lifting rod to press down the limiting rod in the upper card slot, and the limiting structure is released. The matching structure of the card slot, the roller member and the limiting rod uses the roller member to reduce the frictional resistance of the limiting rod in the sliding groove, so that the connecting column can drive the bullet to fly more quickly and smoothly under the drive of the elastic member, impact the incident rod, and complete the impact loading. This series of automated operations effectively reduce manual intervention and significantly improve the operation efficiency and use convenience of the test. In addition, the support mechanism and the impact mechanism of the present invention are convenient for quick disassembly and flexible combination, can adapt to various use environments such as laboratories and engineering sites, are particularly suitable for scenarios with limited experimental conditions such as mountains and underground, significantly improve the operability and applicability of the experiment, and have good mobility and on-site deployment capabilities. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a top view of the present invention;

[0021] Figure 3 is the present invention Figure 2 a schematic cross-sectional structure diagram at A-A in;

[0022] Figure 4 is the present invention Figure 2 a schematic cross-sectional structure diagram at B-B in;

[0023] Figure 5 is a schematic diagram of the structure when the hydraulic telescopic device of the present invention moves to the launcher frame;

[0024] Figure 6 is a schematic diagram of the internal structure when the hydraulic telescopic device of the present invention compresses the bullet;

[0025] Figure 7 is a schematic diagram of the connection structure between the limiting rod and the card slot of the retaining ring of the present invention;

[0026] Figure 8 is a schematic diagram of the structure when the launcher frame of the present invention moves to the test system;

[0027] Figure 9 is a schematic diagram of the internal structure when the launcher frame of the present invention moves to the test system;

[0028] Figure 10 is a schematic diagram of the structure on both sides of the launcher frame of the present invention;

[0029] Figure 11 is a Hertz contact theory model diagram of the present invention;

[0030] Figure 12 is a schematic diagram of heat loss during the process of the bullet hitting the incident rod of the present invention;

[0031] In the drawings, the list of components represented by each label is as follows:

[0032] 1. Support mechanism; 11. Humanoid support; 12. Humanoid guide rail; 13. First electric slider; 14. Second electric slider; 2. Impact mechanism; 21. Hydraulic telescopic device; 211. Locking component; 23. Card slot; 22. Launch tube rack; 222. Fixed rod; 221. Slide groove; 23. Card slot; 231. Upper card slot; 232. Lower card slot; 234. Roller part; 24. Elastic part; 25. Connecting column; 26. Retaining ring; 261. Limit rod; 27. Lifting component; 272. Limit slider; 271. Slide rail rack; 273. Electric lifting rod; 374. Pusher block; 28. Bullet; 3. Test system; 31. Specimen; 32. Incident rod; 33. Transmission rod; 34. Absorbing rod. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] A portable medium strain rate impact device includes a support mechanism 1, an impact mechanism 2 and a test system 3, and is characterized in that: the support mechanism 1 includes: a humanoid support 11, a humanoid guide rail 12 arranged on the humanoid support 11, a first electric slider 13 and a second electric slider 14 arranged at both ends of the humanoid guide rail 12; the impact mechanism 2 includes a hydraulic telescopic device 21 arranged on the first electric slider 13, a launch tube rack 22 arranged on the second electric slider 14, a plurality of card slots 23 arranged on both sides of the launch tube rack 22, an elastic part 24 fixedly connected to the inner end of the launch tube rack 22, a connecting column 25 fixedly connected to the elastic part 24, a retaining ring 26 rotatably connected to the connecting column 25 through a bearing sleeve, a lifting component 27 arranged at the side end of the launch tube rack 22, and a bullet 28 detachably installed in the launch tube rack 22.

[0036] The structures of the humanoid support 11 and the humanoid guide rail 12 are convenient for disassembly, facilitating assembly and transportation. Each component is convenient for quick assembly and disassembly, suitable for flexible deployment and handling in laboratories or engineering sites, and has good mobility, on-site adaptability and portability and practicality.

[0037] The telescopic rod of the hydraulic telescopic device 21 cooperates with the launch tube rack 22. Connect the hydraulic telescopic device 21 and the manual hydraulic pump through a hose, and then slowly pressurize through the manual hydraulic pump to make the telescopic rod of the hydraulic telescopic device 21 move forward.

[0038] The elastic part 24 adopts a telescopic rod with a built-in spring.

[0039] On both sides of the hydraulic telescopic device 21, there are locking components 211, and the telescopic rod of the hydraulic telescopic device 21 is matched with the launcher frame 22.

[0040] On both sides of the launcher frame 22, there are sliding grooves 221. On both sides of the port of the launcher frame 22, there are a plurality of fixing rods 222, and the fixing rods 222 are bolts. The locking component 211 is detachably connected to the fixing rods 222.

[0041] The clamping groove 23 includes a plurality of upper clamping grooves 231 provided at the upper end of one side of the sliding groove 221 and a plurality of lower clamping grooves 232 provided at the lower end of the other side of the sliding groove 221. The side walls of the upper clamping grooves 231 and the lower clamping grooves 232 are both provided with roller members 234. The roller members 234 enable the limit rod 261 to slide and turn into rolling when moving out of the clamping groove 23, reducing sliding friction and quickly moving out. On one side of the upper clamping grooves 231 and the lower clamping grooves 232, there are numerical marks. The numerical marks are used to intuitively indicate the position of the retaining ring limit rod, thereby reflecting the compression amount of the elastic member, facilitating the unified setting of the impact energy, improving the test repeatability, and can be used as experimental parameters for the calculation of spring energy storage.

[0042] On both sides of the retaining ring 26, there are limit rods 261, and the limit rods 261 are detachably connected to the clamping groove 23.

[0043] The lifting component 27 includes a slide rail frame 271 fixedly connected to the side end of the launcher frame 22, a limit slider 272 connected to the slide rail frame 271 in a matching manner, an electric lifting rod 273 fixedly connected to the limit slider 272, and a push block 274 fixedly connected to the telescopic end of the electric lifting rod 273.

[0044] The test system 3 includes a test piece 31, an incident rod 32 and a transmission rod 33 respectively arranged on both sides of the test piece 31, and an absorption rod 34 arranged at the side end of the transmission rod 33. The incident rod 32, the transmission rod 33 and the absorption rod are arranged on a fatigue test machine.

[0045] The first electric slider 13, the second electric slider 14, the hydraulic telescopic device 21, the electric lifting rod 273, and the test system 3 are electrically connected to an external signal control component.

[0046] The signal control component includes a strain gauge, an amplifier, a controller, a data acquisition system, etc. Specifically, the strain gauges are pasted on the incident bar 31 and the transmission bar 32, responsible for converting stress waves into electrical signals. These strain gauges are welded to the cassette bridge to ensure accurate signal transmission. The weak signals output by the strain gauges are transmitted to the strain gauge amplifier through the circuit interface. The amplifier amplifies and conditions the signals for subsequent processing. The user needs to set parameters such as the amplification factor and the bridge voltage value to adapt to different test conditions. The amplified signals are transmitted to the data acquisition system. This system is responsible for collecting and storing signals, and the user needs to set parameters such as the sampling frequency and the triggering mode. The data acquisition system transmits the stored signals to the computer for processing and analysis. The stress, strain, and strain rate are calculated according to the one-dimensional stress wave theory, and the stress-strain curve is plotted. Through the above connection relationship and signal transmission path, the mechanical properties of materials at high strain rates can be accurately measured.

[0047] The first electric slider 13, the second electric slider 14, the hydraulic telescopic device 21, the electric lifting rod 273, and the computer are all electrically connected to the controller, and the controller transmits relevant signals to the computer for processing and analysis.

[0048] All the electrical components in the present invention are externally connected to the 220V mains.

[0049] The application of a portable medium strain rate impact device includes the following steps:

[0050] (1) Complete the alignment between the hydraulic telescopic device 21 and the launch tube rack 22, install the specimen 31, and connect the external signal control component; then use the hydraulic telescopic device 21 to compress the elastic member 24 to a predetermined energy, and fix the position through the retaining ring 26;

[0051] (2) Then move the hydraulic telescopic device 21 away, fill the bullet 28 into the launch tube rack 22, and adjust the device; then move the launch tube rack 22 to align with the incident bar 32, release the elastic member 24 to push the bullet 28 to impact the incident bar 32, generating a stress wave to load the specimen 31;

[0052] (3) During the test, the external signal control component records the data of the incident wave, reflected wave, and transmitted wave in real time; finally, calculate the dynamic stress-strain characteristics of the material based on the waveform data, and the test can be repeated after adjusting the parameters according to the experimental needs.

[0053] Embodiment 2

[0054] I. The main technical parameters in the present invention:

[0055] The size of the launch tube rack: 54×60×600mm (inner diameter × outer diameter × length);

[0056] Specification of the inner spring of the elastic component: stiffness coefficient is 3000 N / m, and length is 480 mm;

[0057] Dimensions of the bullet: radius of curvature is 25 mm, and cross-sectional diameter is 50 mm;

[0058] Specification of the bolt (fixed rod): select M2 bolt;

[0059] Bearing specification: 50×35×10 mm (inner diameter × outer diameter × thickness);

[0060] Specification of the latch assembly: designed bearing capacity is 3.20 kN;

[0061] Specification of the hydraulic telescopic device: outer diameter is 60 mm, and maximum elongation of the telescopic rod is 480 mm;

[0062] Dimensions of the baffle: 50×52×5 mm (inner diameter × outer diameter × thickness);

[0063] Dimensions of the connecting column: diameter is 35 mm, and thickness is 3 mm;

[0064] Specification of the manual hydraulic pump: pressure range is 300 - 1000 kPa;

[0065] II. Design of the bullet:

[0066] When using this device for impact tests, in order to obtain the ideal loading waveform and design the bullet based on the loading waveform, the design of the bullet mainly depends on the following factors:

[0067] 1. Parameter analysis of the bullet

[0068] 1 Geometric parameters

[0069] According to the basic principle of one-dimensional wave analysis, the radius of curvature of the bullet will change the steepness of the rising edge of the stress wave, its cross-sectional area will affect the wave impedance in the elastic rod, and the length of the bullet will affect the propagation time of the stress wave in it, which further determines the characteristics of the stress wave generated by the bullet.

[0070] 2 Material properties

[0071] In the design process of the bullet, the density, elastic modulus and Poisson's ratio of the material are all key factors, which jointly affect the propagation characteristics of the stress wave in the elastic rod. However, in actual operation tests, in order to facilitate the acquisition of materials, reduce costs and ensure the repeatability of test results, alloy steel is usually selected as the bullet material.

[0072] 3 Bullet speed

[0073] When the bullet remains unchanged, different impact velocities will result in different peak values of the stress wave generated by the bullet. According to the one-dimensional wave theory, the velocity difference at the contact point between the bullet and the incident bar will affect the steepness of the stress wave rise. Therefore, when designing the bullet, the impact velocity of the bullet must be considered. On the premise of assuming consistent material properties, once the mass of the bullet is determined, the volume of the bullet is indirectly determined. Any two of the three parameters, namely the cross-sectional area, the radius of curvature, and the length of the bullet, can determine the volume of the bullet. In this article, for the convenience of calculation, the cross-sectional area and the radius of curvature of the bullet are selected.

[0074] 2. Stress Wave Characteristic Analysis

[0075] (1) The rise time is a key parameter in dynamic tests, which determines whether the stress can be evenly distributed in the specimen during the stress wave rise stage. To obtain the dynamic mechanical properties of rocks at medium strain rates, when the peak value remains unchanged, the rise time must be controlled within an appropriate range to ensure that the required strain rate conditions are met.

[0076] (2) The magnitude of the peak value has a significant impact on the strain generated inside the specimen and its change rate. This means that the height of the peak value is directly related to the strain response and strain rate level of the specimen during dynamic loading.

[0077] (3) The curvature of the rising edge has a direct impact on the stress rate during the loading process, and different curvature shapes will result in different stress rate changes. This means that by adjusting the curvature of the rising edge, the stress change rate experienced by the specimen during dynamic loading can be controlled.

[0078] (4) The duration of the stress wave is another key factor affecting the failure of rocks under dynamic loads. In the SHPB test, it also determines the choice of data acquisition method. The duration of the stress wave will affect the dynamic response characteristics of rocks, and thus affect the acquisition and analysis methods of test data. Therefore, when designing and analyzing the SHPB test, the duration of the stress wave is a factor that cannot be ignored.

[0079] Taking into account the above influencing factors and existing literature, the bullet of this experimental device is designed as follows: the radius of curvature is 25 mm, the cross-sectional diameter is 50 mm, the mass is 3 kg, and the material is alloy steel.

[0080] III. When the bullet impacts the incident bar or is used in other working conditions, energy loss will occur during the impact process. In order to obtain the energy required to generate medium strain rates, the energy losses generated during the impact process can be calculated, and then the total initial energy can be calculated from these two parts of energy. The initial energy in this device can adjust the compression amount of the spring to control the total output energy, so as to make the energy transmitted to the incident bar meet the requirements.

[0081] IV. Description of Test Equipment and Test Methods:

[0082] The impacts of earthquakes, blasting, etc. on rock masses or rock blocks are mainly caused by the stress waves generated by explosions propagating in the rock masses or rock blocks, which result in the instability of the rock masses or rock blocks due to the dynamic strain generated by the rock masses driven by the stress waves.

[0083] The present invention can be mainly applied to experimental research: replacing the air gun or pendulum in the traditional Split Hopkinson Pressure Bar device to become a new medium strain rate loading device. In actual application, this device can be combined with devices such as the incident bar and transmission bar of the Split Hopkinson Pressure Bar, and the mechanical property changes of rocks at medium strain rates can be studied under the conditions of medium strain rates generated by this device, which has certain guiding significance for preventing the hazards caused by earthquakes and blasting; it can also be used as an active vibration source with a fixed frequency and fixed energy at the engineering site. When it is necessary to monitor the changes in the structural plane due to vibration at the site, it can act as a vibration source.

[0084] The specific operation of the present invention includes the following steps:

[0085] Connected in parallel with the impact test system:

[0086] 1. The operator first sets strain gauges on both the incident bar 32 and the transmission bar 33, and completes the assembly of relevant test components, and then completes the installation of the specimen 31. The operator sends a start command for the hydraulic telescopic device 21 to the controller through the computer. After receiving the start command, the first electric slider 13 drives the hydraulic telescopic device 21 to automatically move along the human-shaped guide rail 12 to the port of the launch cylinder rack 22, and then fixes the two by fixing between the locking components 211 on both sides of the hydraulic telescopic device 21 and the fixing rod 222 on the launch cylinder rack 22, aligning and fixing them. Subsequently, the telescopic end of the hydraulic telescopic device 21 is used to press the connecting column 25 to compress the elastic member 24 to a predetermined energy, and the retaining ring 26 is rotated so that the two end limit rods 261 respectively enter the upper card slot 231 and the lower card slot 232 to complete the position fixing. At this time, under the action of the elastic rebound of the elastic member 24, the two end limit rods 261 are respectively in close contact with the roller members 234 on the side ends of the upper card slot 231 and the lower card slot 232.

[0087] Calculate the compression amount of the spring required when generating a medium strain rate through formulas, and record the data after the calculation is completed. The calculation process is as follows:

[0088] First, it is necessary to determine the required energy, and then calculate the energy loss:

[0089] The strain energy is calculated according to the following formula:

[0090]

[0091] In Equation (1), U is the strain energy, E is the elastic modulus of the material, ΔL is the amount of tension or compression of the material (the bullet in this device), and L is the length of the material (the bullet in this device).

[0092] As can be seen from the above equation, when the bullet is designed, the elastic modulus, length, cross-sectional area, etc. can be obtained. It is necessary to calculate the compression amount during the bullet impact process. After consulting the data, it can be calculated through the Hertz contact theory that when the spherical surface contacts the plane, the compression amount of the spherical surface can be obtained.

[0093] As shown in the attachment Figure 11 The bullet compression amount is calculated through the Hertz contact theory as follows:

[0094]

[0095] Among them, δ is the compression amount of the ball during the contact process, and the parameters in the equation are all known quantities. The compression amount can be calculated, and then the numerical value is substituted into Equation (1) to obtain the strain energy during the impact process.

[0096] For heat loss, it is necessary to analyze from the perspective of molecular energy conversion, and the approximate law can be fitted by experimental statistical data. As shown in (a), (b), (c), and (d) of Table 1 Figure 12 After calculation, it can be known that the heat loss is about 2-5 times the strain energy (note that this value is obtained through experiments in this experimental device and the laboratory of this unit, and this value is not applicable to different experimental conditions and needs to be re-tested and calculated).

[0097]

[0098] Table 1 Laboratory test data and energy calculation

[0099] From the above calculations, the energy loss of this device during the test can be obtained. Then, combined with the actual energy required during the impact experiment, the initial total energy of the impact can be obtained. The compression amount of the spring can be obtained from the following equation:

[0100]

[0101] Assume that the required energy is 33 J, the spring stiffness coefficient is 3000 N / m, and the heat loss is 2 times the strain energy. According to the law of conservation of energy, the following equation can be obtained:

[0102]

[0103] P = Kx (7)

[0104] The compression amount of the spring can be calculated from the equation, where \(x\) is the compression amount of the spring and \(A\) is the cross-sectional area of the bullet. Then the number of scale divisions to be compressed can be obtained. Substitute the known parameters: \(R_0 = 0.025m\), assume \(\mu_1=\mu_2 = 0.25\), \(E_1 = E_2=E = 200000MPa\), \(L = 0.16m\) into the formula, and the compression amount of the spring is about \(0.2m\).

[0105] 2. Then slowly release the pressure, remove the hydraulic telescopic device 21, and fill the bullet 28 into the launch tube rack 22 to contact the connecting column 25. Then control the second electric slider 14 to move the launch tube rack 22 to the incident rod 32, and align the port of the launch tube rack 22 with the incident rod 32. Then move the limit slider 272 so that the electric lifting rod 273 moves to the upper card slot 231 where the limit rod 261 is installed, and align the push block 274 at the telescopic end of the electric lifting rod 273 with the limit rod 261 in the upper card slot 231 up and down. The operator issues a movement command for the electric lifting rod 273 through the computer, the controller transmits the signal to the electric lifting rod 273, and the telescopic end of the electric lifting rod 273 moves downward. The push block 274 pushes out the limit rod 261 in the upper card slot 231, releases the elastic member 24 to push the bullet 28 to impact the incident rod, generating a stress wave to be loaded onto the specimen 31;

[0106] 3. During the test, the external signal control component records the data of the incident wave, reflected wave and transmitted wave in real time.

[0107] After completing the above operations, each device needs to be restored to its original position, and the above test steps are repeated to continue the test until the test is completed.

Claims

1. A portable medium strain rate impact device, comprising a support mechanism (1), an impact mechanism (2) and a test system (3), characterized in that: The support mechanism (1) includes a humanoid support frame (11), a humanoid guide rail (12) arranged on the humanoid support frame (11), a first electric slider (13) and a second electric slider (14) arranged at both ends of the humanoid guide rail (12); the impact mechanism (2) includes a hydraulic telescopic device (21) arranged on the first electric slider (13), a launcher frame (22) arranged on the second electric slider (14), a plurality of card slots (23) arranged on both sides of the launcher frame (22), an elastic member (24) fixedly connected to the inner end of the launcher frame (22), a connecting column (25) fixedly connected to the elastic member (24), a retaining ring (26) rotatably connected to the connecting column (25), a lifting assembly (27) arranged at the side end of the launcher frame (22), and a bullet (28) detachably installed in the launcher frame (22).

2. The portable medium strain rate impact device according to the claim, wherein Locking components (211) are arranged on both sides of the hydraulic telescopic device (21), and the telescopic rod of the hydraulic telescopic device (21) cooperates with the launcher frame (22).

3. The portable medium strain rate impact device according to the claim is characterized in that, Chute grooves (221) are arranged on both sides of the launcher frame (22), and a plurality of fixing rods (222) are arranged on both sides of the port of the launcher frame (22), and the locking components (211) are detachably connected to the fixing rods (222).

4. The portable medium strain rate impact device according to the claim, characterized in that, The card slots (23) include a plurality of upper card slots (231) arranged at the upper end of one side chute groove (221) and a plurality of lower card slots (232) arranged at the lower end of the other side chute groove (221), and roller members (234) are arranged on the side walls of the upper card slots (231) and the lower card slots (232).

5. The portable medium strain rate impact device according to the claim, characterized in that, Limit rods (261) are arranged on both sides of the retaining ring (26), and the limit rods (261) are detachably connected to the card slots (23).

6. The portable medium strain rate impact device according to the claim, wherein, The lifting assembly (27) includes a slide rail frame (271) fixedly connected to the side end of the launcher frame (22), a limit slider (272) cooperatively connected to the slide rail frame (271), an electric lifting rod (273) fixedly connected to the limit slider (272), and a push block (274) fixedly connected to the telescopic end of the electric lifting rod (273).

7. The portable medium strain rate impact device according to the claim, wherein, The test system (3) includes a test piece (31), an incident rod (32) and a transmission rod (33) respectively arranged on both sides of the test piece (31), and an absorption rod (34) arranged at the side end of the transmission rod (33), and the incident rod (32), the transmission rod (33) and the absorption rod are arranged on a fatigue testing machine.

8. The portable medium strain rate impact device according to the claim, wherein, The first electric slider (13), the second electric slider (14), the hydraulic telescopic device (21), the electric lifting rod (273), and the test system (3) are electrically connected to an external signal control component.

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