Device and method for testing dynamic strength of rock sample

Abstract

The invention discloses a device and method for testing the dynamic strength of a rock sample, and relates to the technical field of material testing.The device for testing the dynamic strength of the rock sample comprises a bottom frame, an experiment rod structure and an excitation structure, and the experiment rod structure comprises an incident rod and a transmission rod; the incident rod and the transmission rod are both installed on the bottom frame along the axis in the first direction, the incident rod is movably arranged in the first direction, a test area is formed between the corresponding ends of the incident rod and the transmission rod, the excitation structure comprises an impact piece and a reset piece, and the impact piece is installed on the bottom frame corresponding to the end, away from the test area, of the incident rod. The impact structure is movably arranged in the first direction; according to the scheme, the reset piece is adopted to replace traditional manual automatic bullet filling action, operation convenience and testing efficiency are greatly improved, and the problem that when traditional filling is not in place, the output torque of the incident rod is unstable, and the accuracy of a testing result is affected can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of material testing, and in particular to a rock sample dynamic strength testing device and a testing method. Background Art

[0002] The tensile strength of rock is less than its own compressive strength, and tensile failure is a major factor causing the failure of rock or rock mass. Therefore, understanding the tensile properties of rock materials under tensile loads is of great significance for the design and construction of rock structures.

[0003] At present, the test method for measuring the tensile strength of rock is mainly determined by the splitting method. The traditional test devices are mostly simple in structure, and generally use vertical impact to crush the sample. This uniaxial test method has problems such as load eccentricity, specimen asymmetry, and stress concentration, which will affect the accuracy of the test results. This scheme proposes a rock sample dynamic strength test device and test method, which adopts a horizontal test structure. During the test, the "bullet" structure used for impact is manually reset and loaded, which can effectively improve the test efficiency while ensuring the test accuracy. Summary of the invention

[0004] The main purpose of the present invention is to provide a rock sample dynamic strength testing device and a testing method, aiming to solve the problem that the traditional testing device has low testing efficiency and the accuracy of the test results is easily affected.

[0005] To achieve the above-mentioned purpose, the rock sample dynamic strength testing device proposed by the present invention comprises:

[0006] chassis;

[0007] An experimental rod structure, comprising an incident rod and a transmission rod, wherein the incident rod and the transmission rod are both mounted on the base frame along an axis in a first direction, and the incident rod is movably arranged along the first direction, and a test area is formed between corresponding ends of the incident rod and the transmission rod; and

[0008] an exciting structure, comprising an impact member and a reset member, wherein the impact member is mounted on the base frame corresponding to an end of the incident rod away from the test area, the impact structure is movably arranged in the first direction, and its movable stroke includes an initial position and an exciting position, and the reset member is arranged on the base frame and connected to the impact member, and is used to drive the impact member to move from the exciting position to the initial position;

[0009] The first direction is a horizontal direction.

[0010] In one embodiment, the excitation structure further includes a shell, and the shell is arranged on the base frame along the first direction;

[0011] The impact member has a contact end corresponding to the incident rod, the impact member is slidably installed in the shell, and the contact end is arranged outside the shell;

[0012] The impact member forms a first cavity in the inner cavity of the shell corresponding to one end of the incident rod, and the reset member is connected to the first cavity.

[0013] In one embodiment, the reset element comprises:

[0014] A protective shell, arranged on the base frame;

[0015] A buffer cylinder is disposed in the protective shell, wherein the flexible portion of the buffer cylinder and the first cavity are connected via a conducting pipe; and

[0016] An air supply device, the output end of which is connected to the inner cavity of the protective shell.

[0017] In one embodiment, a second cavity is formed in the inner cavity of the shell at one end of the impact member away from the incident rod;

[0018] The excitation structure further includes a pneumatic output member, and the pneumatic output member includes:

[0019] a high-pressure gas source, disposed on the base frame; and

[0020] An output pipe, one end of which is arranged at the output end of the high-pressure gas source, and the other end of which is connected to the second cavity, and an electric control valve is arranged on the output end;

[0021] The impact member is also provided with an airway structure, one end of which is connected to the second cavity for exhausting the second cavity.

[0022] In one embodiment, an oblong air hole extending along the first direction is formed on the arc-shaped outer wall of the shell, and the oblong air hole includes a first end and a second end;

[0023] The airway structure comprises an airway body and a valve unit, the air inlet end of the airway body is connected to the second cavity, and the valve unit is arranged at the air inlet end of the airway body, and the exhaust end of the airway structure is arranged corresponding to the oblong air hole;

[0024] The exhaust end of the airway body corresponds to the second end as the initial position, and the excitation position is set between the first end and the second end.

[0025] In one embodiment, the end of the impact member corresponding to the second cavity is provided with a groove structure recessed into the interior thereof, the groove structure includes an annular groove portion and a trapezoidal groove portion, the annular groove portion is provided at the end of the impact member corresponding to the second cavity, the trapezoidal groove portion is connected to the annular groove portion, and the cross-sectional area of ​​the trapezoidal groove gradually decreases from the annular groove portion toward the interior of the impact member;

[0026] The valve unit is arranged inside the annular groove.

[0027] In one embodiment, a second cavity is formed in the inner cavity of the shell at one end of the impact member away from the incident rod;

[0028] A stop ring is provided on the inner wall of one end of the shell corresponding to the second cavity, and the stop ring is used to stop the end of the impact member corresponding to the second cavity;

[0029] A plurality of springs are arranged between one end of the impact member and the inner wall of the shell.

[0030] In one embodiment, the rock sample dynamic strength testing device further includes a temperature control structure, and the temperature control structure includes:

[0031] a furnace body, mounted on the base frame corresponding to the test area, for providing a high temperature or low temperature environment, the furnace body being provided with a furnace door; and,

[0032] The blowing member is used for blowing hot air, and the output end of the blowing member is arranged corresponding to the furnace door.

[0033] The present invention also provides a rock sample dynamic strength testing method, the rock sample dynamic strength testing method is applied to a rock sample dynamic strength testing device, the rock sample dynamic strength testing device comprises:

[0034] chassis;

[0035] An experimental rod structure, comprising an incident rod and a transmission rod, wherein the incident rod and the transmission rod are both mounted on the base frame along an axis in a first direction, and the incident rod is movably arranged along the first direction, and a test area is formed between corresponding ends of the incident rod and the transmission rod; and

[0036] an exciting structure, comprising an impact member and a reset member, wherein the impact member is mounted on the base frame corresponding to an end of the incident rod away from the test area, the impact structure is movably arranged in the first direction, and its movable stroke includes an initial position and an exciting position, and the reset member is arranged on the base frame and connected to the impact member, and is used to drive the impact member to move from the exciting position to the initial position;

[0037] The first direction is a horizontal direction;

[0038] The rock sample dynamic strength testing method comprises the following steps:

[0039] Preset the furnace experimental temperature, turn on the furnace, and create a low-temperature environment;

[0040] When the temperature in the furnace reaches the preset temperature, put the rock sample to be tested into the furnace, close the furnace door, and perform low temperature treatment on the rock sample;

[0041] Place the rock sample in the test area, control the high-pressure gas source and the electric control valve to make the impact piece hit the incident rod;

[0042] The rock samples in the test area are crushed by the incident rod and the relevant test data are stored.

[0043] In one embodiment, placing a rock sample in a test area includes:

[0044] Adjusting the posture of the rock sample in the test area so that the axis of the rock sample coincides with the axis in the first direction;

[0045] Place one end surface of the rock sample against one end surface of the transmission rod.

[0046] The technical solution of the present invention is that the impact member generates instantaneous high-speed motion in the first direction and impacts one end of the incident rod at the excitation position, thereby crushing the rock sample in the test area. After the rock sample is crushed, the reset member can drive the impact member to automatically reset relatively slowly in the first direction, so that the impact member can stably and accurately return to the initial position and prepare for the next test. The reset member used in this solution can replace the traditional manual automatic filling of "bullets", which not only greatly improves the convenience of operation and test efficiency, but also solves the problem that when the traditional filling is not in place, the output torque of the incident rod is unstable and affects the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0048] Figure 1 A schematic structural diagram of an embodiment of a rock sample dynamic strength testing device provided by the present invention;

[0049] Figure 2 for Figure 1 Schematic diagram of part of the structure of the excited structure;

[0050] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0051] Figure 4 For application Figure 1 Flow chart of the test method of the dynamic strength test device for rock specimens;

[0052] Figure 5 for Figure 4 Flowchart of specific methods for some process steps.

[0053] Description of Figure Numbers:

[0054] 100. Rock sample dynamic strength test device; 1. Base frame; 2. Experimental rod structure; 21. Incident rod; 22. Transmission rod; 3. Impact member; 31. Impact rod; 32. Groove structure; 321. Annular groove; 322. Trapezoidal groove; 4. Pneumatic output member; 41. High-pressure gas source; 42. Output pipe; 421. Electric control valve; 43. Airway structure; 431. Airway body; 432. Valve unit; 5. Shell; 51. First cavity; 52. Second cavity; 53. Oblong air hole; 54. Stop ring; 541. First ring; 542. Second ring; 55. Spring; 6. Temperature control structure; 61. Furnace body; 611. Furnace door; 62. Blowing member; 7. Reset member; 71. Protective shell; 72. Buffer cylinder; 721. Flexible part; 73. Air supply device.

[0055] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] The tensile strength of rock is less than its own compressive strength, and tensile failure is a major factor causing the failure of rock or rock mass. Therefore, understanding the tensile properties of rock materials under tensile loads is of great significance for the design and construction of rock structures.

[0060] At present, the test method for measuring the tensile strength of rock is mainly determined by the splitting method. The traditional test devices are mostly simple in structure, and generally use vertical impact to crush the sample. This uniaxial test method has problems such as load eccentricity, specimen asymmetry, and stress concentration, which will affect the accuracy of the test results. This scheme proposes a rock sample dynamic strength test device and test method, which adopts a horizontal test structure. During the test, the "bullet" structure used for impact is manually reset and loaded, which can effectively improve the test efficiency while ensuring the test accuracy.

[0061] The present invention provides a rock sample dynamic strength testing device 100.

[0062] See also Figures 1 to 3In one embodiment of the present invention, the testing device is mainly used for dynamic strength testing of rock samples in civil engineering. The rock sample tested in this solution is a cylindrical sample, and its overall diameter and height are both about 16 mm. During the test, the rock sample needs to be treated with high temperature or low temperature in advance. During the test, the transmission rod 22 and the incident rod 21 in the experimental rod structure 2 work together to crush the rock sample, and obtain its dynamic strength value when the rock sample is broken. Among them, the transmission rod 22 and the incident rod 21 are both arranged on the base frame 1, and in order to ensure the accuracy of the test results, the transmission rod 22 and the incident rod 21 are coaxially arranged on the base frame 1 along the first direction on the horizontal plane. A test area is formed between the corresponding ends of the two. During the test, the rock sample needs to be placed in the test area, so that the axis of the rock sample coincides with the common axis of the two rods, and one end of the transmission rod 22 is placed close to the rock sample, so as to support one end of the rock sample. A sensing device is provided on one end of the transmission rod 22 and the incident rod 21, which can receive real-time stress data information. The excitation structure is used to drive the incident rod 21 to move in the first direction. Specifically, the excitation structure is provided at one end of the incident rod 21 away from the transmission rod 22. The impact member 3 in the excitation structure is a structural member that directly contacts the incident rod 21. During the actual test, the impact member 3 generates instantaneous high-speed movement in the first direction and hits one end of the incident rod 21 at the excitation position, so as to crush the rock sample in the test area. After the rock sample is crushed, the reset member 7 can drive the impact member 3 to automatically reset relatively slowly in the first direction, so that the impact member 3 can return to the initial position stably and accurately, and prepare for the next test. The reset member 7 used in this solution can replace the traditional manual automatic filling of the "bullet", which not only greatly improves the convenience of operation, but also solves the problem of unstable output torque of the incident rod 21 when the traditional filling is not in place.

[0063] Specifically, the reset member 7 in this embodiment is configured as a pneumatic structure, which drives the impact member 3 to perform a reset movement by means of pressurization. In order to form a relatively closed pressurized environment, a corresponding shell 5 is arranged in the excitation structure, and the shell 5 structure is relatively sealed. The main part of the impact member 3 is slidably installed in the inner cavity of the shell 5 along the first direction. The impact member 3 also includes a contact end, which is formed by the distal end of the impact rod 31 arranged on one horizontal end thereof. The impact rod 31 slides out of the shell 5. When the impact is completed, the air supply device 73 in the reset member 7 starts to work and introduces gas into the protective shell 71 to pressurize its inner cavity, thereby causing the flexible portion 721 to deform, thereby introducing the gas in the buffer cylinder 72 into the first cavity 51. After the air pressure in the first cavity 51 increases, it will drive the impact member 3 to perform a reset movement in the shell 5. In the actual operation process, the air supply device 73 can be used to control the air intake, thereby slowly increasing the gas pressure in the first cavity 51, so that the impact member 3 can move to the initial position at a relatively slow speed, thereby avoiding hard contact interference between the impact member 3 and the inner wall of the shell 5, thereby affecting the stability of the entire device during use.

[0064] As for the impact output process of the impact member 3, the impact member 3 moves toward the test area in the first cavity 51, the space inside the first cavity 51 is reduced, and the gas inside the first cavity 51 is introduced into the buffer cylinder 72 through the conducting tube. Since a certain instantaneous impact force is required when the rock sample is crushed, the air pressure change in the first cavity 51 has the characteristics of instantaneous change. Through the setting of the flexible part 721, the instantaneous pressure change can be buffered by the deformation of the flexible part 721, and the resistance encountered by the impact member 3 during the impact process can be minimized. The protective shell 71 can not only provide a relatively sealed space for applying pressure to the flexible part 721, but also form a protective shell structure on the outside of the flexible part 721, avoiding the influence of the flexible part 721 on the outside when it is damaged, and visually isolate the deformation of the flexible part 721, which is conducive to improving the sense of safety of the operators.

[0065] It can be imagined that there are many specific options for the reset member 7. The reset movement of the impact member 3 inside the shell 5 can be achieved through conventional mechanical structures, such as a push rod or a cylinder structure, but the relevant structure needs to extend its mechanical output end into the inner cavity of the shell 5 and form a direct contact connection with the impact member 3. Then, the reciprocating motion of the impact member 3 will also directly affect the movement of its specific output end, which requires the two connecting structures to cooperate with each other. Considering that the instantaneous movement of the impact member 3 may affect the structure of the traditional push rod and the cylinder element itself, resulting in frequent maintenance in the later stage, the above-mentioned structure is preferably used as the reset member 7 in this embodiment.

[0066] In this embodiment, the driving member of the impact member 3 is also set as a pneumatic structure, specifically, it is set as a pneumatic output member 4. It is connected to the second cavity 52 through a high-pressure gas source 41, and an electric control valve 421 is provided on the output pipe 42 to control the discharge of high-pressure gas, so as to control the instantaneous change rate of the impact member 3. Specifically, when the electric control valve 421 is opened, the high-pressure gas in the high-pressure gas source 41 can be instantly discharged into the second cavity 52. ​​At this time, the air pressure in the second cavity 52 increases instantaneously, which will drive the impact member 3 to accelerate instantaneously and impact the incident rod 21 through its outward contact end. The opening of the electric control valve 421 is instantaneous, and the amount of high-pressure gas output is regulated by its specific opening. When the electric control valve 421 is opened and the impact member 3 forms an instantaneous action, the electric control valve 421 is switched to a closed state. When the impact member 3 performs the reset movement, the volume of the second cavity 52 decreases. In order to ensure the smooth movement of the impact member 3, the second cavity 52 also needs to be pressure-relieved during the movement of the impact member 3. Therefore, an airway structure 43 is provided on the impact member 3. During the reset movement of the impact member 3, the air inside the second cavity 52 is discharged synchronously through the airway structure 43.

[0067] Specifically, an oblong air hole 53 extending along the first direction is provided on the arc-shaped outer wall of the shell 5. When the impact member 3 moves inside the shell 5, the outlet end of the airway body 431 moves between the first end and the second end of the oblong air hole 53. It should be noted that when the exhaust end of the airway body 431 corresponds to the second end, the impact member 3 is at the initial position, and the excitation position is set between the first end and the second end. Specifically, during the reset movement of the impact member 3, the volume of the second cavity 52 decreases. At this time, the exhaust end of the airway body 431 moves from the first end to the second end, and the gas in the second cavity 52 is discharged to the outside of the shell 5 through the airway body 431. In this process, the arc-shaped side wall of the impact member 3 located on the left side of the exhaust end of the airway body 431 simultaneously shields the oblong air hole 53. When the exhaust end of the airway body 431 moves to the second end and is shielded by the second end, the gas inside the second cavity 52 cannot be discharged. At this time, the impact member 3 is at the initial position. Correspondingly, when the high-pressure gas source 41 and the electric control valve 421 are actuated simultaneously, the gas pressure in the second cavity 52 increases instantaneously. At this time, the impact member 3 moves toward the test area, and the exhaust end of the airway body 431 moves from the second end to the first end. During this process, the contact end of the impact member 3 located outside the shell 5 collides with the incident rod 21, thereby driving the incident rod 21 to crush the rock sample. At this time, the excitation position should be located between the first end and the second end.

[0068] It should be noted that, in order to avoid as much as possible that when the air pressure in the second cavity 52 increases, a large amount of gas in the second cavity 52 is discharged from the airway structure 43, thereby affecting the driving effect of the high-pressure gas source 41. In actual implementation, the aperture of the airway body 431 is relatively small, and a valve unit 432 is provided at its end to control the ventilation volume in the airway body 431, and the valve unit 432 is arranged as much as possible inside the annular groove of the groove structure 32, thereby avoiding the valve unit 432 directly corresponding to the high-pressure airflow, thereby better realizing the uniform exhaust of the airway structure 43, and avoiding as much as possible the impact on the instantaneous response of the impact member 3. In order to further ensure the response effect of the impact member 3, a section of trapezoidal groove portion 322 is connected to one end of the annular groove portion 321 to the inner side of the impact member 3, and the cross-sectional area of ​​the trapezoidal groove gradually decreases from the annular groove portion 321 to the inner direction of the impact member 3. When the high-pressure airflow is introduced, the high-pressure airflow can be gathered at the middle position of the impact member 3 through the trapezoidal groove 322 , thereby increasing the instantaneous response speed of the impact member 3 in the housing 5 .

[0069] When the impact member 3 is in the initial position, in order to further ensure the stability of the position of the impact member 3, a stop ring 54 is provided on the inner wall of one end of the shell 5 corresponding to the second cavity 52, and the inner hole of the stop ring 54 is set to be stepped, which includes a first ring portion 541 with a larger aperture, this end is arranged toward the middle position of the shell 5, and the second ring portion 542 with a smaller aperture is connected to the inner wall of the shell 5. When the impact member 3 moves on the inner wall of the shell 5, one end thereof moves synchronously on the inner wall of the first ring portion 541, thereby ensuring the sealing of the second cavity 52. ​​When the impact member 3 is in the initial position, one end of the impact member 3 contacts the step surface at the connecting position of the first ring portion 541 and the second ring portion 542, thereby limiting the impact member 3, and in order to ensure the stability of the impact member 3 during the movement, a plurality of springs 55 are provided between one end of the impact member 3 and the inner wall of the shell 5. During the impact or reset movement of the impact member 3 , the spring 55 can output torque evenly, thereby ensuring the stability of the impact member 3 during the movement as much as possible.

[0070] The rock sample dynamic strength test device 100 disclosed in this scheme needs to test the dynamic strength of the rock sample under low temperature conditions. Therefore, a temperature control structure 6 is provided on the base frame 1, and the temperature control structure 6 includes a furnace body 61 and a blowing member 62. Specifically, the furnace body 61 can provide a body temperature environment to perform low temperature treatment on the rock sample. This process needs to last for a period of time, so the furnace door 611 needs to be in a closed state. In order to avoid the furnace door 611 being in a closed state for a long time in an extremely low environment, which causes the furnace door 611 to be unable to open smoothly, generally, warm air is blown to the furnace door 611 through the blowing member 62, so as to ensure the smooth opening of the furnace door 611. The blowing member 62 can be set as a combination of a heating member and an air supply structure, and hot air can be delivered through a hose. The specific closing and opening of the furnace door 611 can be manually operated, or the furnace door 611 can be driven to rotate by a cylinder or a push rod, so as to realize the automatic opening and closing of the furnace door 611, which can be selected according to the actual production materials. In addition, during the actual implementation process, a corresponding discharge structure can be set up to automatically take and place the rock samples.

[0071] The present invention also includes a rock sample dynamic strength test method, see Figures 1 to 5The rock sample dynamic strength test method is applied to a rock sample dynamic strength test device 100. The specific structure of the rock sample dynamic strength test device 100 is as described above. Since the rock sample dynamic strength test method adopts all the technical solutions in the above embodiments, it has at least all the beneficial effects brought by the technical solutions in the above embodiments, which will not be described one by one here. The rock sample dynamic strength test method includes the following steps:

[0072] Preset the experimental temperature of the furnace body 61, turn on the furnace body 61, and create a low temperature environment;

[0073] This scheme involves a dynamic strength test of a rock sample under low temperature conditions. Before the test, the furnace body 61 needs to be opened to allow the temperature inside the furnace body 61 to reach the temperature required for the low temperature experiment. The rock sample of this scheme is in a cylindrical shape with a diameter and height of about 16 mm. The experimental temperature of the furnace body 61 is maintained between minus 25°C and minus 120°C.

[0074] When the temperature in the furnace body 61 reaches a preset temperature, the rock sample to be tested is placed in the furnace body 61, and the furnace door 611 is closed to perform low temperature treatment on the rock sample;

[0075] According to the size and type of the sample, the corresponding low temperature condition is found within the above temperature range, and the temperature of the furnace body 61 is adjusted to within the temperature range. Then, the rock sample is placed in the furnace body 61 and cooled for at least 20 minutes.

[0076] Place the rock sample in the test area, control the high pressure gas source 41 and the electric control valve 421 to work, so that the impact member 3 impacts the incident rod 21;

[0077] The rock sample that has been cooled is taken out and placed in the test area. The position of the rock sample is adjusted, and the high-pressure gas source 41 and the electric control valve 421 are controlled to work so that the impact piece 3 impacts the incident rod 21. During this process, the output pressure of the high-pressure gas source 41 needs to be adjusted within a certain range. Generally, the gas pressure is controlled between 0.45 bar and 2 bar. If the gas source pressure is less than the above range, the impact output force is insufficient. If it is greater than the above range, there is excess output force, which is not conducive to the stable output of the impact piece 3.

[0078] The rock sample in the test area is crushed by the incident rod 21, and the relevant test data is stored;

[0079] The rock sample in the test area is crushed by the injection rod. Corresponding pressure sensors are provided at the ends of the injection rod 21 and the transmission rod 22, which can output the stress when the rock sample is crushed. The relevant test data are stored through the corresponding storage element to provide a basis for subsequent analysis.

[0080] Place the rock specimens in the test area, including:

[0081] Adjusting the posture of the rock sample in the test area so that the axis of the rock sample coincides with the axis in the first direction;

[0082] When testing the rock sample in this scheme, the dynamic tensile stress in the axial direction of the rock sample is tested. Therefore, in order to ensure the accuracy of the test data, the axis of the rock sample needs to be set on the same axis as the axis of the incident rod 21 and the transmission rod 22, so as to obtain more accurate test results.

[0083] Place one end surface of the rock sample against one end surface of the transmission rod 22;

[0084] During the test, one end face of the rock sample needs to be placed against one end face of the transmission rod 22 corresponding to the test area, and one end of the rock sample is supported by the transmission rod 22 to prevent the rock sample from suddenly contacting the transmission rod 22 during the impact process, which may affect the accuracy of the test data.

[0085] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rock sample dynamic strength testing device, characterized in that: include: chassis; An experimental rod structure, comprising an incident rod and a transmission rod, wherein the incident rod and the transmission rod are both mounted on the base frame along an axis in a first direction, and the incident rod is movably arranged along the first direction, and a test area is formed between corresponding ends of the incident rod and the transmission rod; and an exciting structure, comprising an impact member and a reset member, wherein the impact member is mounted on the base frame corresponding to an end of the incident rod away from the test area, the impact structure is movably arranged in the first direction, and its movable stroke includes an initial position and an exciting position, and the reset member is arranged on the base frame and connected to the impact member, and is used to drive the impact member to move from the exciting position to the initial position; The first direction is a horizontal direction.

2. The rock sample dynamic strength testing device according to claim 1, characterized in that: The excitation structure further comprises a shell, and the shell is arranged on the base frame along the first direction; The impact member has a contact end corresponding to the incident rod, the impact member is slidably installed in the shell, and the contact end is arranged outside the shell; The impact member forms a first cavity in the inner cavity of the shell corresponding to one end of the incident rod, and the reset member is connected to the first cavity.

3. The rock sample dynamic strength testing device according to claim 2, characterized in that: The reset element comprises: A protective shell, arranged on the base frame; A buffer cylinder is disposed in the protective shell, wherein the flexible portion of the buffer cylinder and the first cavity are connected via a conducting pipe; and An air supply device, the output end of which is connected to the inner cavity of the protective shell.

4. The rock sample dynamic strength testing device according to claim 2, characterized in that: A second cavity is formed in the inner cavity of the shell at one end of the impact member away from the incident rod; The excitation structure further includes a pneumatic output member, and the pneumatic output member includes: a high pressure gas source, disposed on the base frame; and An output pipe, one end of which is arranged at the output end of the high-pressure gas source, and the other end of which is connected to the second cavity, and an electric control valve is arranged on the output end; The impact member is also provided with an airway structure, one end of which is connected to the second cavity for exhausting the second cavity.

5. The rock sample dynamic strength testing device according to claim 4, characterized in that: An oblong air hole extending along the first direction is formed on the arc-shaped outer wall of the shell, and the oblong air hole includes a first end and a second end; The airway structure comprises an airway body and a valve unit, the air inlet end of the airway body is connected to the second cavity, and the valve unit is arranged at the air inlet end of the airway body, and the exhaust end of the airway structure is arranged corresponding to the oblong air hole; The exhaust end of the airway body corresponds to the second end as the initial position, and the excitation position is set between the first end and the second end.

6. The rock sample dynamic strength testing device according to claim 5, characterized in that: The end of the striking member corresponding to the second cavity is provided with a groove structure recessed into the interior thereof, the groove structure comprising an annular groove portion and a trapezoidal groove portion, the annular groove portion is provided at the end of the striking member corresponding to the second cavity, the trapezoidal groove portion is connected to the annular groove portion, and the cross-sectional area of ​​the trapezoidal groove gradually decreases from the annular groove portion to the interior of the striking member; The valve unit is arranged inside the annular groove.

7. The rock sample dynamic strength testing device according to claim 2, characterized in that: A second cavity is formed in the inner cavity of the shell at one end of the impact member away from the incident rod; A stop ring is provided on the inner wall of one end of the shell corresponding to the second cavity, and the stop ring is used to stop the end of the impact member corresponding to the second cavity; A plurality of springs are arranged between one end of the impact member and the inner wall of the shell.

8. The rock sample dynamic strength testing device according to claim 1, characterized in that: The rock sample dynamic strength testing device also includes a temperature control structure, which includes: a furnace body, mounted on the base frame corresponding to the test area, for providing a high temperature or low temperature environment, the furnace body being provided with a furnace door; and, The blowing member is used for blowing hot air, and the output end of the blowing member is arranged corresponding to the furnace door.

9. A method for testing the dynamic strength of a rock sample, applied to a rock sample dynamic strength testing device as claimed in any one of claims 1 to 8, characterized in that: The rock sample dynamic strength testing method comprises the following steps: Preset the furnace experimental temperature, turn on the furnace, and create a low-temperature environment; When the temperature in the furnace reaches the preset temperature, put the rock sample to be tested into the furnace, close the furnace door, and perform low temperature treatment on the rock sample; Place the rock sample in the test area, control the high-pressure gas source and the electric control valve to make the impact piece hit the incident rod; The rock samples in the test area are crushed by the incident rod and the relevant test data are stored.

10. The rock sample dynamic strength testing method according to claim 9, characterized in that: Place the rock specimens in the test area, including: Adjusting the posture of the rock sample in the test area so that the axis of the rock sample coincides with the axis in the first direction; Place one end surface of the rock sample against one end surface of the transmission rod.

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