Handheld rock compressive strength testing device and testing method thereof

Abstract

The invention discloses a handheld rock compressive strength testing device and a testing method thereof, and belongs to the technical field of rock testing. An acquisition module is arranged in a cavity formed in a handle and an end cover, a stepping motor is arranged in a second shell, a lithium battery is arranged in a first shell, and a fixing seat is arranged on an output shaft of the stepping motor; a displacement sensor and a pull pressure sensor are arranged on the fixing seat, a contact cushion block is arranged at the bottom of the second shell, and a pressing head is arranged in a middle through hole of the contact cushion block. The pressure head is vertically pressed into the surface of the outcrop of the rock, the pull pressure sensor receives measured pressure value information, the displacement sensor receives press-in depth information of the measured pressure head 16, the data receiving unit sends the measured pressure value and the press-in depth information of the measured pressure head 16 to the controller, and the compressive strength value of the rock is calculated. The compressive strength of the rock mass can be measured on site and a test result can be obtained on the outcrop rock collection site, and the method has extremely low requirements on types and shapes of rock samples, and has relatively high test efficiency and relatively wide adaptability.

Description

Technical Field

[0001] The present invention belongs to the technical field of geotechnical testing, and particularly relates to a handheld rock compressive strength testing device and a testing method thereof. Background Art

[0002] The uniaxial compressive strength of rock refers to the load that can be borne per unit area when a rock specimen is unidirectionally compressed until failure, which is abbreviated as compressive strength. It is measured according to the crushing standard specimen based on its water content state, including dry compressive strength, natural compressive strength, and saturated compressive strength. In the laboratory, the rock compressive strength is generally measured by special and large experimental equipment, but standard specimens need to be prepared in advance according to the standard requirements, such as standard cylindrical rock samples with a diameter of 25 mm and a length of 50 mm. When conducting geological exploration in the field, if it is necessary to test the strength of rock outcrops in a certain area, most of them adopt on-site sampling, transport them back to the laboratory for processing, and then conduct tests. In this way, the data acquisition cycle is long, the workload is large, and the cost is relatively high.

[0003] The selection of outcrop cores must meet the requirement of being consistent with the rock compressive strength of the target formation. Therefore, when collecting outcrop rocks, it is necessary to conduct a compressive strength analysis on the outcrop rocks. The conventional methods and steps are as follows: The first step is to select the outcrop rock collection area; the second step is to collect outcrop rock samples in the collection area; the third step is to bring the collected rock samples back to the laboratory for compressive test analysis; the fourth step is to drill cores in the outcrop collection area if the compressive strength of the outcrop rock is consistent with the rock compressive strength of the target formation. Therefore, the conventional rock compressive strength testing method has problems such as cumbersome operation steps, long time consumption, and low efficiency.

[0004] In the prior art, the Chinese invention patent with the application number CN202011165427.9 discloses a method for on-site measurement of rock compressive strength, which is mainly used in the construction industry. The usage method is as follows: Fix the instrument on a flat and hard ground or other flat rocks and level it. Carefully clean and lubricate the two guide rods. Place the rock sample in the middle position of the lower pressing plate, cover the upper pressing plate. The rock sample is a core, and its height does not exceed 10 cm. Tighten the fixing nut of the lower pressing plate to fix the rock sample. Use a depth gauge to measure the initial depth of the rock sample. Adjust the nail so that it just touches the surface of the rock sample. Place the cushion block on the nail. Lift the weight to a predetermined height and release the pull rope. The weight vertically hits the nail bearing plate along the guide rod. Read the compressive strength through the acquisition device. The testing device and testing method described by this method have many problems, such as complex equipment composition, cumbersome operation, and the accuracy of the results is easily affected by the environment, etc.

[0005] The Chinese utility model patent application number CN202120221049.5 discloses a rock compressive strength test device, the working principle of which is: through the drive motor under the working platform, a lead screw with left-handed or right-handed threads is driven to make synchronous forward or reverse movements, and then the rock is clamped by the pressure plates on the left and right columns to carry out the compressive strength test. The device is large and requires an external power supply, which is not suitable for field operation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a handheld rock compressive strength test device and a test method thereof which has gradual operation, compact structure, is easy to carry, does not require an external power supply, has high test efficiency and wide applicability.

[0007] The technical solution adopted to solve the above technical problems is: a handheld rock compressive strength testing device includes a handle, a first shell, and a second shell. The first shell is arranged on one side of the handle, and the second shell is arranged on the other side of the handle. An end cover is arranged on the upper end of the handle, and a collection module is arranged inside the cavity formed by the handle and the end cover. The collection module is electrically connected to the controller. A stepper motor is arranged inside the second shell. A lithium battery for powering the stepper motor and the collection module is arranged inside the first shell. A power button for controlling the lithium battery switch is arranged on the first shell. A fixed seat is arranged on the output shaft of the stepper motor. The output shaft of the stepper motor drives the fixed seat to move in a vertical direction inside the second shell. A displacement sensor and a tension and pressure sensor are arranged on the fixed seat. The displacement sensor and the tension and pressure sensor are electrically connected to the collection module. A contact pad that contacts the surface of the rock outcrop is arranged at the bottom of the second shell. A pressure head for entering the rock is arranged in the middle through hole of the contact pad, and the pressure head is connected to the tension and pressure sensor.

[0008] Furthermore, the bottom surface of the handle is a wavy curved surface.

[0009] Furthermore, the output shaft of the stepper motor is fixedly connected to the lead screw, the lead screw is threadedly connected to the nut, and the nut is fixedly connected to the fixing seat.

[0010] Furthermore, the indenter is a diamond indenter.

[0011] Further, the acquisition module includes a data receiving unit and a Bluetooth wireless communication unit; the data receiving unit is electrically connected to the tensile and compressive force sensor, and the tensile and compressive force sensor converts the received measurement pressure value information into an electrical signal and sends it to the data receiving unit; the data receiving unit is electrically connected to the displacement sensor, and the displacement sensor converts the received depth information of the measurement indenter 16 being pressed into the object into an electrical signal and sends it to the data receiving unit; the data receiving unit is electrically connected to the controller through the Bluetooth wireless communication unit, and the data receiving unit sends the measurement pressure value and the depth information of the measurement indenter 16 being pressed into the object to the controller, and the model of the controller is TB6600HG 1409GA / JAPAN.

[0012] Further, a bottom cover is provided at the bottom of the first housing.

[0013] Further, a waterproof cover is provided at the upper end of the second housing.

[0014] A test method using a handheld rock compressive strength testing device includes the following steps:

[0015] S1, Select a test point of the rock to be tested and expose the surface of the rock to be tested.

[0016] S2, Hold the handle, fit the contact pad to the surface of the rock outcrop, turn on the power button, and make the lithium battery inside the first housing supply power to the acquisition module and the stepping motor.

[0017] S3, The output shaft of the stepping motor drives the lead screw to rotate, the nut moves vertically downward on the lead screw, the nut drives the fixed seat, the displacement sensor, the tensile and compressive force sensor, and the indenter to move downward, and the indenter can vertically press into the surface of the rock outcrop, and the depth of the indenter entering the rock is 0 - 1.5 mm, and the working time is 2 - 3 min.

[0018] S4, The tensile and compressive force sensor converts the received measurement pressure value information into an electrical signal and sends it to the data receiving unit, the displacement sensor converts the received depth information of the measurement indenter 16 being pressed into the object into an electrical signal and sends it to the data receiving unit, and the data receiving unit sends the measurement pressure value and the depth information of the measurement indenter 16 being pressed into the object to the controller through the Bluetooth wireless communication unit, and the controller generates a production stress-strain curve and calculates the compressive strength value of the rock.

[0019] The beneficial effects of the present invention are as follows: (1) In the present invention, the contact cushion block is attached to the surface of the rock outcrop. The output shaft of the stepping motor drives the lead screw, nut, fixed seat, displacement sensor, tension and compression sensor, and the indenter to move downward. The indenter vertically presses into the surface of the rock outcrop. The tension and compression sensor receives the measured pressure value information, and the displacement sensor receives the information on the penetration depth of the indenter 16. The data receiving unit sends the measured pressure value and the information on the penetration depth of the indenter 16 to the controller through the Bluetooth wireless communication unit, calculates the compressive strength value of the rock, and can measure the compressive strength of the rock mass on-site at the rock outcrop collection site and obtain the test results. The present invention has extremely low requirements for the type and shape of rock samples, and has high test efficiency and wide adaptability.

[0020] (2) The present invention uses a lithium battery to supply power to the stepping motor and the acquisition module, without the need for an external power supply. An operator can operate it with one hand. At the same time, the present invention has the advantages of a compact structure, being easy to carry, and being suitable for indoor and outdoor use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 is a schematic structural diagram of an embodiment of the handheld rock compressive strength testing device of the present invention.

[0023] Reference numerals: 1, bottom cover; 2, first housing; 3, lithium battery; 4, power button; 5, end cover; 6, handle; 7, cavity; 8, acquisition module; 9, waterproof cover; 10, stepping motor; 11, second housing; 12, lead screw; 13, nut; 14, fixed seat; 15, tension and compression sensor; 16, indenter; 17, contact cushion block.. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0025] As Figure 1As shown, the handheld rock compressive strength testing device of this embodiment is composed of a bottom cover 1, a first shell 2, a lithium battery 3, a power button 4, an end cover 5, a handle 6, a cavity 7, a collection module 8, a waterproof cover 9, a stepper motor 10, a second shell 11, a screw 12, a nut 13, a fixing seat 14, a tension and pressure sensor 15, a pressure head 16, a contact pad 17, and a displacement sensor connection.

[0026] A first shell 2 is provided on one side of the handle 6, and a second shell 11 is provided on the other side of the handle 6. The bottom surface of the handle 6 is a wavy curved surface, which fits the curved surface of the bent finger, making it easy for people to hold the handle 6. An end cover 5 is provided on the upper end of the handle 6. A collection module 8 is provided inside the cavity 7 formed inside the handle 6 and the end cover 5. The collection module 8 is electrically connected to the controller. A stepper motor 10 is provided inside the second shell 11, and a waterproof cover 9 is provided on the upper end of the second shell 11. A lithium battery 3 for powering the stepper motor 10 and the collection module 8 is provided inside the first shell 2, and a bottom cover 1 is provided at the bottom of the first shell 2. The first shell 2 is provided with a power button 4 for controlling the switch of the lithium battery 3, the output shaft of the stepper motor 10 is provided with a fixed seat 14, the output shaft of the stepper motor 10 is fixedly connected to the screw rod 12, the screw rod 12 is threadedly connected to the nut 13, the nut 13 is fixedly connected to the fixed seat 14, the output shaft of the stepper motor 10 drives the fixed seat 14 to move in the vertical direction inside the second shell 11, the fixed seat 14 is provided with a displacement sensor and a tension and pressure sensor 15, the displacement sensor and the tension and pressure sensor 15 are electrically connected to the acquisition module 8, the bottom of the second shell 11 is provided with a contact pad 17 that contacts the surface of the rock outcrop, the middle through hole of the contact pad 17 is provided with a pressure head 16 for entering the rock, the pressure head 16 is a diamond pressure head, the depth of the pressure head 16 entering the rock is 0-1.5mm, the pressure head 16 is connected to the tension and pressure sensor 15, in the initial state, the lower bottom surface of the pressure head 16 and the lower bottom surface of the contact pad 17 are in the same horizontal plane,

[0027] The acquisition module 8 includes a data receiving unit and a Bluetooth wireless communication unit. The data receiving unit is electrically connected to the tension and pressure sensor 15. The tension and pressure sensor 15 converts the received measured pressure value information into an electrical signal and sends it to the data receiving unit. The data receiving unit is electrically connected to the displacement sensor. The displacement sensor converts the received measured pressure head 16 penetration depth information into an electrical signal and sends it to the data receiving unit. The data receiving unit is electrically connected to the controller via the Bluetooth wireless communication unit. The data receiving unit sends the measured pressure value and the measured pressure head 16 penetration depth information to the controller. The model of the controller is TB6600HG 1409GA / JAPAN.

[0028] The test method of this embodiment using a handheld rock compressive strength test device includes the following steps:

[0029] S1. Select a test point on the rock to be measured and expose the surface of the rock to be tested;

[0030] S2. Hold the handle 6, fit the contact pad 17 to the surface of the rock outcrop, and turn on the power button 4 to supply power to the acquisition module 8 and the stepping motor 10 by the lithium battery 3 inside the first housing 2;

[0031] S3. The output shaft of the stepping motor 10 drives the lead screw 12 to rotate, and the nut 13 moves vertically downward on the lead screw 12. The nut 13 drives the fixed seat 14, the displacement sensor, the tensile and compressive force sensor 15, and the indenter 16 to move downward. The indenter 16 can vertically press into the surface of the rock outcrop, and the depth that the indenter 16 enters the rock is 0 - 1.5 mm, and the working time is 2 - 3 min;

[0032] S4. The tensile and compressive force sensor 15 converts the received measured pressure value information into an electrical signal and sends it to the data receiving unit. The displacement sensor converts the received measured indenter 16 pressing depth information into an electrical signal and sends it to the data receiving unit. The data receiving unit sends the measured pressure value and the measured indenter 16 pressing depth information to the controller through the Bluetooth wireless communication unit. The controller generates a production stress - strain curve and calculates the compressive strength value of the rock.

[0033] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above - disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. Handheld rock compressive strength testing device, Characterized in that: It includes a handle (6), a first housing (2), and a second housing (11). One side of the handle (6) is provided with the first housing (2), the other side of the handle (6) is provided with the second housing (11), the upper end of the handle (6) is provided with an end cap (5), and a cavity (7) formed inside the handle (6) and the end cap (5) is internally provided with a collection module (8). The collection module (8) is electrically connected to a controller. A stepping motor (10) is arranged inside the second housing (11), and a lithium battery (3) for supplying power to the stepping motor (10) and the collection module (8) is arranged inside the first housing (2). A power button (4) for controlling the switch of the lithium battery (3) is arranged on the first housing (2). The output shaft of the stepping motor (10) is provided with a fixing seat (14), and the output shaft of the stepping motor (10) drives the fixing seat (14) to move vertically inside the second housing (11). A displacement sensor and a tension and compression sensor (15) are arranged on the fixing seat (14). The displacement sensor and the tension and compression sensor (15) are electrically connected to the collection module (8). A contact pad (17) that abuts against the surface of the rock outcrop is arranged at the bottom of the second housing (11). A pressure head (16) for entering the interior of the rock is arranged in the middle through hole of the contact pad (17), and the pressure head (16) is connected to the tension and compression sensor (15).

2. The handheld rock compressive strength testing device according to claim 1, Characterized in that: The bottom surface of the handle (6) is a wavy curved surface.

3. The handheld rock compressive strength testing device according to claim 1, Characterized in that: The output shaft of the stepping motor (10) is fixedly connected to a lead screw (12), the lead screw (12) is threadedly connected to a nut (13), and the nut (13) is fixedly connected to the fixing seat (14).

4. The handheld rock compressive strength testing device according to claim 1, Characterized in that: The pressure head (16) is a diamond pressure head.

5. The handheld rock compressive strength testing device according to claim 1, Characterized in that: The collection module (8) includes a data receiving unit and a Bluetooth wireless communication unit; The data receiving unit is electrically connected to the tension and compression sensor (15), and the tension and compression sensor (15) converts the received measurement pressure value information into an electrical signal and sends it to the data receiving unit; The data receiving unit is electrically connected to the displacement sensor, and the displacement sensor converts the received measurement depth information of the pressure head 16 being pressed into the rock into an electrical signal and sends it to the data receiving unit; The data receiving unit is electrically connected to the controller through the Bluetooth wireless communication unit. The data receiving unit sends the measurement pressure value and the measurement depth information of the pressure head 16 being pressed into the rock to the controller, and the model of the controller is TB6600HG 1409GA / JAPAN.

6. The handheld rock compressive strength testing device according to claim 1, Characterized in that: A bottom cover (1) is arranged at the bottom of the first housing (2).

7. The handheld rock compressive strength testing device according to claim 1, Characterized in that: A waterproof cover (9) is provided at the upper end of the second housing (11).

8. A test method for using the handheld rock compressive strength testing device according to claim 1, characterized in that it includes the following steps: S1. Select a test point of the rock to be measured and expose the surface of the rock to be tested; S2. Hold the handle (6), fit the contact pad (17) to the surface of the rock outcrop, turn on the power button (4), and supply power to the acquisition module (8) and the stepping motor (10) by the lithium battery (3) inside the first housing (2); S3. The output shaft of the stepping motor (10) drives the lead screw (12) to rotate, and the nut (13) moves vertically downward on the lead screw (12). The nut (13) drives the fixed seat (14), the displacement sensor, the tensile and compressive force sensor (15), and the indenter (16) to move downward. The indenter (16) can vertically press into the surface of the rock outcrop, and the depth of the indenter (16) entering the rock is 0 - 1.5 mm, and the working time is 2 - 3 min; S4. The tensile and compressive force sensor (15) converts the received measurement pressure value information into an electrical signal and sends it to the data receiving unit. The displacement sensor converts the received measurement indenter 16 pressing depth information into an electrical signal and sends it to the data receiving unit. The data receiving unit sends the measurement pressure value and the measurement indenter 16 pressing depth information to the controller through the Bluetooth wireless communication unit, and the controller generates a production stress-strain curve and calculates the compressive strength value of the rock.

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