A mine rock mass borehole visualized penetration strength testing device

Abstract

This invention relates to the field of mining equipment and discloses a visual penetration strength testing device for borehole drilling in mines. The device includes: a data acquisition unit for simultaneously acquiring, processing, and storing three types of test data: pressure, displacement, and depth; a manual hydraulic pump to provide driving force for the probe assembly to compress the rock mass; an oil outlet pipe connected to the output end of the manual hydraulic pump; and a return oil pipe connected to the input end of the manual hydraulic pump. A pressure sensor is fixedly installed on the top of the manual hydraulic pump and electrically connected to the data acquisition unit via a pressure connection line. This invention allows for direct in-situ penetration testing deep into mine boreholes without the need to drill complete rock cores for standard sample preparation. It preserves the original geostress environment and structural features of the rock mass, and the test results more closely reflect the actual mechanical state of the underground rock mass. It is particularly suitable for weak, fractured, and low-strength rock masses with interlayers, providing reliable strength data support for surrounding rock stability evaluation.

Description

Technical Field

[0001] This invention relates to the field of mining equipment, and more particularly to a visual penetration strength testing device for drilling in rock mass mines. Background Technology

[0002] Rock mass strength is a core mechanical parameter for evaluating the stability of surrounding rock in mines and for intelligent assessment of safe production. Conducting in-situ penetration tests on rock mass underground can accurately reflect the impact of the geostress environment and structural plane distribution on the mechanical properties of the rock mass, obtain the dynamic characteristics of rock mass failure under mining operations, and provide reliable data support for roadway support design and disaster prevention and control.

[0003] Currently, rock mass strength testing is mainly divided into two categories: laboratory testing and in-situ testing. Laboratory testing requires drilling complete rock cores from boreholes, processing them into standard specimens, and then measuring their uniaxial compressive strength using a pressure testing machine. In-situ testing often employs methods such as large-size direct shear, sonic detection, and borehole drilling, with equipment operated manually and test data recorded.

[0004] However, existing technologies cannot meet the testing needs of small-diameter boreholes in mines. For weak, fractured rock masses with structural interlayers that are difficult to cor, the results of indoor tests are significantly biased. Traditional in-situ testing also suffers from drawbacks such as limited testing points, high costs, and cumbersome operation, making it difficult to meet the demand for efficient and continuous in-situ testing of rock mass strength in mines. Therefore, a visual penetration strength testing device for mine rock boreholes is proposed to solve the above problems. Summary of the Invention

[0005] To overcome the above shortcomings, the present invention provides a visual penetration strength testing device for drilling in mine rock masses, which aims to solve the problems of limited testing points, high cost, and cumbersome operation in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a visual penetration strength testing device for drilling in rock mass mines, comprising: The data acquisition instrument is used to simultaneously acquire, process, and store three types of test data: pressure, displacement, and depth. A manual hydraulic pump provides driving force for the probe assembly to compress the rock mass. The output end of the manual hydraulic pump is connected to an oil outlet pipe, and the input end of the manual hydraulic pump is connected to a return oil pipe. The pressure sensor is fixedly installed on the top of the manual hydraulic pump and is electrically connected to the data acquisition instrument through a pressure connection line. It is used to convert the physical quantity of hydraulic oil pressure into an electrical signal in real time and transmit it to the data acquisition instrument to realize continuous automatic acquisition of test pressure. Pipeline reel, used to simultaneously wind and store oil supply and return pipes, adaptable to wiring needs of drilling at different depths; The probe assembly is fixedly installed at the end of the oil outlet and return pipe away from the manual hydraulic pump. It converts the hydraulic pressure into the mechanical extrusion force of the probe, which acts directly on the borehole wall to complete the rock mass penetration loading, while simultaneously collecting piston displacement data.

[0007] As a further description of the above technical solution: the probe assembly includes a piston cylinder, a piston rod, a seal, and a displacement sensor. The rodless chamber of the piston cylinder is connected to the oil outlet pipe, and the rod chamber of the piston cylinder is connected to the oil return pipe. The piston rod is slidably connected to the inner wall of the piston cylinder, and a probe is provided at the outer end of the piston rod. The seal is provided at the mating gap between the piston cylinder and the piston rod, and the displacement sensor is fixedly installed on the piston cylinder.

[0008] As a further description of the above technical solution: the displacement sensor is electrically connected to the data acquisition instrument through a displacement connecting line, and the displacement connecting line is wound around the pipeline reel.

[0009] As a further description of the above technical solution: the data acquisition device is internally equipped with a signal processing module, a data storage module and a rechargeable battery. The front of the data acquisition device is equipped with a touch screen display, which integrates a charging interface, a USB interface and a power switch, supporting independent power supply on site and offline data storage.

[0010] As a further description of the above technical solution: the data acquisition instrument is equipped with embedded acquisition software, which supports the creation of new test projects, engineering information input, meter zeroing, parameter calibration, real-time data display and test start / stop control functions, and synchronously records the time sequence data of depth, oil pressure and displacement.

[0011] As a further description of the above technical solution: the piston rod in the probe assembly has a diameter of 24mm, the probe diameter is 2mm, and the pressure at the end of the probe is amplified by 144 times the oil pressure of the manual hydraulic pump.

[0012] A testing method for a visual penetration strength testing device for borehole drilling in mining rock masses includes the following steps: S1. Test preparation: Connect the oil and signal lines of the manual hydraulic pump, pipeline coil and probe assembly, turn on the data acquisition instrument and complete parameter calibration, and enter project information such as project name, acquisition location, detection hole number, hole diameter, and rock mass material; S2. Probe lowering: Insert the probe assembly into the borehole to be tested, control the lowering depth through the pipeline reel, stop lowering after reaching the target test layer, and complete the zeroing and calibration of the depth gauge. S3. Pressure loading: Operate the manual hydraulic pump to gradually increase the pressure. The high-pressure oil enters the probe piston cylinder through the oil outlet pipe, pushing the piston rod to drive the penetration probe to extend and continuously squeeze the rock mass on the borehole wall. S4. Synchronous acquisition: During the pressurization process, the pressure sensor collects the circuit oil pressure in real time, and the displacement sensor collects the probe displacement in real time. The two types of data are synchronously transmitted to the data acquisition instrument for storage and visualization display. S5; Failure determination: Continue to increase the pressure until the rock mass of the borehole wall reaches critical failure, the oil pressure drops sharply, the data acquisition instrument automatically locks and records the critical failure oil pressure peak value of the measuring point; S6. Strength conversion: Based on the preset pressure-strength conversion model, the uniaxial compressive strength of the rock mass at the measuring point is calculated according to the critical failure oil pressure. S7. Multi-point testing and results output: Adjust the probe to different depth layers and repeat steps S3-S6 to complete multi-point testing; after the test is completed, import the data into the host computer analysis software, draw the rock mass strength distribution curve and generate a formal test report.

[0013] As a further description of the above technical solution: The pressure-strength conversion model described in S6 is obtained by on-site core drilling, laboratory standard uniaxial compressive strength test, and regression calibration of the critical pressure at the corresponding measuring point; for sandstone rock masses, the default conversion factor can be used for direct calculation, and users can modify the conversion factor according to the target rock mass type.

[0014] The present invention has the following beneficial effects: 1. In this invention, in-situ penetration tests can be carried out directly in the mine borehole without drilling complete rock cores to prepare standard samples. It can preserve the original geostress environment and structural features of the rock mass, and the test results are more consistent with the real mechanical state of the rock mass underground. It is especially suitable for weak, broken, and low-strength rock masses with interlayers, and can provide reliable strength data support for the evaluation of surrounding rock stability.

[0015] 2. In this invention, a split structure design is adopted. The small-sized probe can be adapted to boreholes with a diameter of 60mm and above. The manual hydraulic pump does not require an external power source. With the integrated hydraulic and electrical pipeline reel and quick-connect connector, the on-site deployment and relocation operation are simple. Multi-level continuous testing can be completed in the same borehole, effectively reducing the manpower and cost input for testing.

[0016] 3. In this invention, the data acquisition instrument can simultaneously acquire three types of time-series data: pressure, displacement, and depth. The test parameters are displayed in real time through the touch screen to visualize the test process. The test data can be exported to the host computer analysis software to automatically generate strength curves and test reports. With the help of a calibrable strength conversion model, both test efficiency and result accuracy are taken into account. Attached Figure Description

[0017] Figure 1 This is a front view of a visual penetration strength testing device for drilling in rock mass mines, as proposed in this invention. Figure 2This invention proposes a visual penetration strength testing device for borehole drilling in mining rock masses. Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram of the data acquisition instrument of a mine rock mass drilling visualization penetration strength testing device proposed in this invention.

[0018] Legend: 1. Data acquisition instrument; 2. Manual hydraulic pump; 3. Pressure sensor; 4. Pressure connection cable; 5. Oil outlet pipe; 6. Oil return pipe; 7. Pipeline reel; 8. Probe assembly; 81. Piston cylinder; 82. Piston rod; 83. Seal; 84. Displacement sensor; 9. Displacement connection cable. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figure 1 - Figure 3This invention provides an embodiment of a visual penetration strength testing device for boreholes in mines. It is suitable for in-situ rock mass strength testing in boreholes with a borehole diameter ≥60mm in mines, especially for weak, fractured rock masses containing structural interlayers and where core sampling for standard sample preparation is impossible. This device overcomes the shortcomings of laboratory rock samples being detached from the original rock stress environment and resulting in test results that are too high for the actual rock mass strength. The entire device adopts a split design, with the above-ground operating end and the in-hole testing end connected by a long-distance composite pipeline, enabling continuous testing at different depths. It includes a data acquisition unit 1, used to simultaneously acquire, process, and store pressure, displacement, and depth test data. The data acquisition unit 1 internally includes a signal processing module, a data storage module, and a rechargeable battery with a rated voltage of 24.2V. The device has 7.4G of usable storage space, supporting independent operation without external mains power and long-term offline data storage. The signal processing module can amplify the analog signals input from the sensors. The large-scale filtering and analog-to-digital conversion ensures the accuracy of data acquisition in complex downhole environments. The front of the data acquisition unit 1 features a touchscreen display with integrated charging, USB, and power switches, supporting independent on-site power supply and offline data storage. The unit is equipped with embedded acquisition software that supports creating new test projects, entering engineering information, zeroing the meter, parameter calibration, real-time data display, and test start / stop control. It simultaneously records time-series data of depth, oil pressure, and displacement. The main software interface includes three main modules: New Project, File Management, and System Settings. The New Project module allows entry of complete project information such as project name, acquisition location, borehole number, borehole diameter, rock material, testing unit, and testing personnel. The interface displays the current pressure, displacement, and meter readings in real time and includes touch buttons for zeroing the meter and starting acquisition. The File Management module allows browsing of historical test project lists and supports exporting all raw test data via USB connection to a computer.The system settings module provides functions such as time setting, meter calibration, pressure calibration, displacement calibration, and factory reset. It can complete sensor zero-point calibration before testing, eliminating system errors caused by ambient temperature and equipment assembly. During testing, the software synchronously records time-series data of depth, oil pressure, and displacement, ensuring continuous and uninterrupted sampling and complete preservation of data throughout the entire process of rock mass compression and failure. The manual hydraulic pump 2 provides driving force for the probe assembly 8 to compress the rock mass. It uses a manual pressurization method, requiring no external power source, making it suitable for testing scenarios in mines without power supply. The output end of the manual hydraulic pump 2 is connected to an oil outlet pipe 5 for outputting high-pressure hydraulic oil, and the input end is connected to a return oil pipe 6 for recovering low-pressure return oil, forming a complete closed-loop hydraulic circuit. The pump body has a built-in mechanical pressure gauge, which can be used as an auxiliary pressure gauge on site. As an auxiliary observation method, pressure sensor 3 is fixedly installed on the top of manual hydraulic pump 2, and pressure sensor 3 is electrically connected to data acquisition instrument 1 through pressure connection line 4. It is used to convert the physical quantity of hydraulic oil pressure into electrical signal in real time and transmit it to data acquisition instrument to realize continuous automatic acquisition of test pressure, replacing the traditional manual reading method, eliminating the lag of manual reading and visual error, and completely retaining the pressure change data of the entire process from rock mass to failure. The pipeline coil 7 is used to simultaneously wind and store oil outlet pipe 5 and oil return pipe 6. It adopts hydraulic and electrical integrated design, synchronously storing various signal connection lines to adapt to the wiring requirements of boreholes at different depths. The pipeline is equipped with a customized high-pressure composite oil pipe with a rated pressure resistance of 70MPa. Quick plug-in connectors are configured at both ends of the pipeline, which can quickly complete equipment docking and disassembly on the ground, improving the efficiency of transfer testing.The pipeline reel integrates a depth gauge mechanism, which can read the probe's descent depth in real time as the pipeline is extended and retracted, providing depth data support for stratification testing. The probe assembly 8 is fixedly installed at the end of the oil outlet pipe 5 and return pipe 6 away from the manual hydraulic pump 2, serving as the test execution end that extends into the borehole. With a maximum outer diameter of 60mm, it can smoothly enter conventional surrounding rock boreholes in mines, converting hydraulic pressure into the mechanical extrusion force of the probe, directly acting on the borehole wall to complete rock mass penetration loading. Simultaneously, it collects piston displacement data to reflect the rock mass's compressive deformation process. The probe assembly 8 includes a piston cylinder 81... The probe assembly includes a piston rod 82, a seal 83, and a displacement sensor 84. The piston cylinder 81, the pressure-bearing body of the probe, is made of high-strength alloy steel. The rodless chamber of the piston cylinder 81 is connected to the oil outlet pipe 5, serving as the inlet chamber for high-pressure oil. The rod-side chamber of the piston cylinder 81 is connected to the oil return pipe 6, serving as the low-pressure oil return chamber. The piston rod 82 is slidably connected to the inner wall of the piston cylinder 81, and a probe is mounted on the outer end of the piston rod 82. The probe tip is made of hard alloy material, offering excellent wear resistance. The piston rod 82 within the probe assembly 8 has a diameter of 24mm. With a diameter of 2mm, the pressure at the probe tip is amplified 144 times by the oil pressure of the manual hydraulic pump 2. This allows for extremely high contact pressure at the probe tip using relatively low manual pump oil pressure, meeting the requirements for destructive testing of hard rock masses. The seal 83 is located at the mating clearance between the piston cylinder 81 and the piston rod 82, employing a combined high-pressure dynamic seal structure. This effectively prevents hydraulic oil leakage under high-pressure conditions, maintains stable piston chamber pressure, ensures the accuracy of the conversion between oil pressure and probe pressure, and avoids test data deviations caused by internal leakage. The displacement sensor 84 is fixedly installed... On piston cylinder 81, the detection end corresponds to the tail of the piston rod, enabling real-time acquisition of the axial extension displacement of the piston rod. This indirectly obtains the deformation depth of the probe pressed into the rock mass, providing displacement dimension data support for distinguishing the elastic deformation stage, plastic deformation stage, and critical failure stage of the rock mass. Displacement sensor 84 is electrically connected to data acquisition instrument 1 via displacement connection line 9. Displacement connection line 9 is wound around pipeline disc 7, integrating with pressure connection line and hydraulic pipeline into a single composite pipeline. This avoids the tangling and messiness of multiple cables during downhole operations, improving operational convenience and on-site safety.

[0021] Working principle: During the test preparation stage, connect the hydraulic quick connectors and signal connectors at both ends of the pipeline disc 7 to the manual hydraulic pump 2 and the probe assembly 8 respectively, check the oil circuit connection seal and purge the air in the circuit; turn on the data acquisition instrument 1, enter the system setting interface to complete the zero-point calibration of the pressure sensor, displacement sensor and depth gauge, eliminate system errors, enter the new project interface, and fully enter the project information such as the project name, collection location, detection hole number, detection hole diameter, rock mass material, detection unit, and detection personnel for this test, execute the meter zeroing operation, and after confirming that all parameters are zero, the equipment enters the test state, slowly extend the probe assembly 8 into the borehole to be tested, rotate the pipeline disc 7 at a uniform speed to release the composite pipeline, and observe the probe's descent depth in real time through the metering mechanism of the pipeline disc; when the probe reaches the preset target test layer, stop releasing the pipeline and lock the disc, completing the depth calibration of the measuring point. This method allows for continuous testing at different depths within the same borehole, eliminating the need for repeated equipment retrieval and significantly improving the efficiency of multi-point testing within the borehole. The manual hydraulic pump 2 is operated at a constant speed to gradually increase pressure. High-pressure hydraulic oil is delivered to the rodless chamber of the probe piston cylinder 81 via the outlet pipe 5. The oil pressure acts on the piston end face, pushing the piston rod 82 forward and causing the end probe to press against the borehole wall rock mass. As the oil pressure continues to rise, the contact pressure of the probe against the rock mass increases synchronously, continuously applying a radial load to the borehole wall rock mass. The low-pressure oil in the rod chamber of the piston cylinder flows back to the manual hydraulic pump tank via the return pipe 6, maintaining smooth hydraulic circuit circulation. Throughout the pressurization process, the pressure sensor 3 collects the oil pressure value of the hydraulic circuit in real time, and the displacement sensor 84 collects the piston pressure value in real time. The extension displacement of the probe driven by the rod, along with the depth data, is synchronously transmitted to data acquisition instrument 1. The data acquisition instrument processes the signals and stores the original time-series data in real time. It also dynamically refreshes and displays the current values ​​of pressure, displacement, and depth on the touchscreen, enabling on-site visual monitoring of the testing process. Test personnel can intuitively grasp the real-time state of rock mass deformation under pressure. With continuous and stable pressure increases, when the contact pressure applied by the probe reaches the critical bearing limit of the rock mass at the borehole wall, local crushing failure occurs. The probe instantly advances forward, the hydraulic circuit load is suddenly unloaded, and the circuit oil pressure drops sharply. Data acquisition instrument 1 automatically identifies the oil pressure drop characteristic through its built-in algorithm, automatically locks and records the highest oil pressure value before the drop, and uses this as the critical failure oil pressure peak value δ of the rock mass at that measuring point. Therefore, the pressure δi at the probe tip is:

[0022] In the formula: d1 -- Piston rod diameter; d2 -- Diameter of the probe; The borehole penetration probe has a diameter of 2 mm, and the piston rod has a diameter of 24 mm. Therefore:

[0023] Regarding the relationship between critical pressure and uniaxial compressive strength of coal and rock mass, research and experiments in the United States have shown that the uniaxial compressive strength of coal and rock mass can be expressed by the following formula:

[0024] In the formula: δc -- Uniaxial compressive strength of coal and rock mass; δf -- Critical pressure; Ksf -- Strength conversion factor.

[0025] Based on a pre-defined pressure-strength conversion model, core samples were taken from boreholes used in the field test. Traditional uniaxial compressive strength tests of rock samples were conducted in the laboratory. The strength conversion factor was obtained by regression analysis of the relationship between the critical pressure at the field testing point and the uniaxial compressive strength of the core sample at the same location. In the United States, the average strength conversion factor for a 76 mm diameter borehole is 1.25, while for smaller diameter boreholes, the conversion factor is 2.69. The conversion factor for the 2 mm diameter penetration probe in this application is:

[0026] δc -- Uniaxial compressive strength of rock mass; δp -- Critical pressure readings from manual pumps, data obtained from concrete models and sandstone tests.

[0027] After completing the single-point test, the manual hydraulic pump is depressurized, the probe is retracted, and the probe is adjusted to the next depth layer. The above test procedure is repeated to complete the rock mass strength test at multiple depths and layers in the same borehole. After all the tests are completed, the test data stored in the data acquisition instrument is exported via USB interface and imported into the matching RH70 rock mass compressive strength data analysis software. The software can automatically generate pressure-time curves and displacement-time curves for each measuring point, statistically analyze the rock mass strength distribution data at different depths, support editing project attributes, and output standardized test reports with one click, intuitively presenting the strength distribution pattern of the surrounding rock in the mine, and providing data support for mine safety production assessment.

[0028] It is worth noting that in this embodiment, the electrical equipment is a common device in the prior art, and the model used can be customized according to actual usage needs. The power supply interface of the electrical equipment in this invention is connected to the power supply system through a switch (not shown in the figure) and a wire (not shown in the figure) to realize its control. The circuits and controls involved are all prior art and are known in the current field, so they will not be described in detail here.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A visual penetration testing device for rock mass boreholes in mines, characterized in that, include: The data acquisition instrument (1) is used to simultaneously acquire, process and store three types of test data: pressure, displacement and depth. The manual hydraulic pump (2) provides driving force for the probe assembly (8) to squeeze the rock mass. The output end of the manual hydraulic pump (2) is connected to an oil outlet pipe (5), and the input end of the manual hydraulic pump (2) is connected to a return oil pipe (6). The pressure sensor (3) is fixedly installed on the top of the manual hydraulic pump (2), and the pressure sensor (3) is electrically connected to the data acquisition instrument (1) through the pressure connection line (4) to convert the physical quantity of hydraulic oil pressure into an electrical signal in real time and transmit it to the data acquisition instrument to realize the continuous automatic acquisition of test pressure. The pipeline reel (7) is used to simultaneously wind and store the oil outlet pipe (5) and the oil return pipe (6), adapting to the wiring requirements of drilling at different depths; The probe assembly (8) is fixedly installed at the end of the oil outlet pipe (5) and the oil return pipe (6) away from the manual hydraulic pump (2), converting the hydraulic pressure into the mechanical extrusion force of the probe, which directly acts on the borehole wall to complete the rock mass penetration loading, while collecting piston displacement data.

2. The visual penetration strength testing device for borehole drilling in mines according to claim 1, characterized in that: The probe assembly (8) includes a piston cylinder (81), a piston rod (82), a seal (83), and a displacement sensor (84). The rodless chamber of the piston cylinder (81) is connected to the oil outlet pipe (5), and the rod chamber of the piston cylinder (81) is connected to the oil return pipe (6). The piston rod (82) is slidably connected to the inner wall of the piston cylinder (81), and a probe is provided at the outer end of the piston rod (82). The seal (83) is provided at the mating gap between the piston cylinder (81) and the piston rod (82). The displacement sensor (84) is fixedly installed on the piston cylinder (81).

3. The visual penetration strength testing device for borehole drilling in mines according to claim 2, characterized in that: The displacement sensor (84) is electrically connected to the data acquisition instrument (1) via a displacement connecting line (9), and the displacement connecting line (9) is wound around the pipeline disc (7).

4. The visual penetration strength testing device for borehole drilling in mines according to claim 1, characterized in that: The data acquisition device (1) is equipped with a signal processing module, a data storage module and a rechargeable battery. The front of the data acquisition device (1) is equipped with a touch screen display, which integrates a charging interface, a USB interface and a power switch, and supports independent power supply on site and offline data storage.

5. The visual penetration strength testing device for borehole drilling in mines according to claim 4, characterized in that: The data acquisition instrument (1) is equipped with embedded acquisition software, which supports the creation of new test projects, engineering information input, meter zeroing, parameter calibration, real-time data display and test start and stop control functions, and synchronously records the time sequence data of depth, oil pressure and displacement.

6. The visual penetration strength testing device for drilling in mine rock mass according to claim 5, characterized in that: The piston rod (82) in the probe assembly (8) has a diameter of 24 mm, the probe has a diameter of 2 mm, and the pressure at the end of the probe is amplified by 144 times the oil pressure of the manual hydraulic pump (2).

7. A testing method for a mine rock mass borehole visualization penetration strength testing device, applied to the mine rock mass borehole visualization penetration strength testing device as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Test preparation: Connect the oil circuit and signal line of the manual hydraulic pump (2), pipeline plate (7) and probe assembly (8), turn on the data acquisition instrument (1) and complete parameter calibration, and enter the project name, collection location, detection hole number, hole diameter, rock mass material and other project information; S2, probe lowering: insert the probe assembly (8) into the borehole to be tested, control the lowering depth through the pipeline plate (7), stop lowering after reaching the target test layer, and complete the zeroing and calibration of the depth gauge. S3, pressurization: operate the manual hydraulic pump (2) to gradually increase the pressure, and the high pressure oil enters the probe piston cylinder (81) through the oil outlet pipe (5), pushing the piston rod (82) to drive the probe to extend and continuously squeeze the rock mass of the borehole wall; S4. Synchronous acquisition: During the pressurization process, the pressure sensor (3) collects the oil pressure of the circuit in real time, and the displacement sensor (84) collects the probe displacement in real time. The two types of data are synchronously transmitted to the data acquisition instrument (1) for storage and visualization display. S5; Damage judgment: Continue to increase the pressure until the rock mass of the borehole wall reaches critical failure, the oil pressure drops sharply, and the data acquisition instrument (1) automatically locks and records the critical failure oil pressure peak value of the measuring point; S6. Strength conversion: Based on the preset pressure-strength conversion model, the uniaxial compressive strength of the rock mass at the measuring point is calculated according to the critical failure oil pressure. S7. Multi-point testing and results output: Adjust the probe to different depth layers and repeat steps S3-S6 to complete multi-point testing; after the test is completed, import the data into the host computer analysis software, draw the rock mass strength distribution curve and generate a formal test report.

8. The testing method of the visual penetration strength testing device for drilling in mine rock mass according to claim 7, characterized in that: The pressure-strength conversion model described in S6 is obtained through field drilling and core sampling, laboratory standard uniaxial compressive strength test, and regression calibration of the critical pressure at the corresponding measuring point. For sandstone rock masses, the default conversion factor can be used for direct calculation, and users can modify the conversion factor according to the target rock mass type.

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