NL2033614B1 - Device for testing mechanical property of drill rod and test method thereof - Google Patents
Device for testing mechanical property of drill rod and test method thereof Download PDFInfo
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- NL2033614B1 NL2033614B1 NL2033614A NL2033614A NL2033614B1 NL 2033614 B1 NL2033614 B1 NL 2033614B1 NL 2033614 A NL2033614 A NL 2033614A NL 2033614 A NL2033614 A NL 2033614A NL 2033614 B1 NL2033614 B1 NL 2033614B1
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- drill rod
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- mechanical properties
- propulsion device
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 64
- 238000005553 drilling Methods 0.000 claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 21
- 239000011435 rock Substances 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims 2
- 238000000034 method Methods 0.000 description 13
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/12—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring axial thrust in a rotary shaft, e.g. of propulsion plants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Aviation & Aerospace Engineering (AREA)
- Combustion & Propulsion (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a device and a test method for testing mechanical properties of a drill rod, relating to the technical field of drill rods, which comprises: an environmental model for simulating the drilling environment of the drill rod; a rotary impact propulsion device for connecting the drill rod and drilling the drill rod to the environmental model; a plurality of radial loading devices respectively arranged around the environmental model and applying loads to the interior of the environmental model; a test device connected to the rotary impact propulsion device and the radial loading device, and for acquiring and processing the obtained data.
Description
DEVICE FOR TESTING MECHANICAL PROPERTY OF DRILL ROD AND
TEST METHOD THEREOF
[01] The present invention relates to the technical field of drill rods and in particular to a device and a test method for testing the mechanical properties of the drill rods.
[02] In the field of mine roadway excavation support and geotechnical engineering, the use of rock drill is more common, and a drill rod is the necessary supporting equipment of rock drill, the quality of the drill rod directly affects the quality and efficiency of rock drilling, and then affects the roadway excavation and support progress. In order to ensure the quality of the drill rod, it is necessary to sample and test the mechanical properties of a drill rod in the laboratory. In the test of the dnill rod in the prior art (for example, Chinese patent CN 202111062447.8-a device and method for testing the anti-torque property of a coal drill rod), only axial thrust and torsional force are applied to the drill rod, but it is ignored that the drill rod is still subjected to the squeezing force of the rock formation after drilling the rock formation, resulting in the lack of environmental elements in the test, and the test results are naturally inaccurate.
[03] Itis an object of the present invention to provide a device and a test method for testing mechanical properties of a drill rod, which can completely simulate the whole process of drilling work of a drill rod in a laboratory and provide accurate data and basis for safe driving and efficient support;
[04] The present invention provides a device for testing mechanical properties of a drill rod, which comprises: an environmental model for simulating the drilling environment of the drill rod; a rotary impact propulsion device for connecting the drill rod and drilling the drill rod to the environmental model; a plurality of radial loading devices respectively arranged around the environmental model and applying loads to the interior of the environmental model; a test device connected to the rotary impact propulsion device and the radial loading device, and for acquiring and processing the obtained data.
[05] Further, the environmental model is rock or simulated rock.
[06] Further, the rotary impact propulsion device includes a rotary propulsion device and an impact propulsion device.
[07] Further, the rotary propulsion device comprises a slideway, a propulsion platform and a driving motor, the slideway is located at one side of the environmental model, the propulsion platform is slidably arranged on the slideway, the driving motor is fixedly arranged on the propulsion platform, and the driving motor is connected to the drill rod.
[08] Further, the impact propulsion device comprises an axial hydraulic thruster fixedly arranged between the environmental model and the rotary impact propulsion device, the drill rod is rotatably connected to the axial hydraulic thruster in a radial direction of the drill rod, and the drill rod and the axial hydraulic thruster move in synchronism in an axial direction of the drill rod.
[09] Further, the radial loading device includes a radial hydraulic loader, the radial loading device comprises radial hydraulic loaders, the environmental model is cylindrical, and a plurality of the radial hydraulic loaders are arranged around the outer cylindrical surface of the environmental model and are arranged along the axial direction of the environmental model.
[10] Further, the testing device comprises a plurality of sensors, a data acquisition system and a data processing system, the sensors are respectively connected to the rotary propulsion device, the impact propulsion device and the radial loading device, the data acquisition system is connected to the sensors, the data processing system is connected to the data acquisition system and visually outputs data processing results.
[11] Further, the sensors comprise a pressure sensor and a dynamic torque sensor, the impact propulsion device and the radial loading device are connected to the drill rod by the pressure sensor and the rotary propulsion device is connected to the drill rod by the dynamic torque sensor.
[12] Further, a fixing truss is included, the environmental model 1s fixedly disposed within the fixing truss, the fixing end of the radial loading device is fixedly connected to the fixing truss, and the movable end of the radial loading device is fixedly connected to the environmental model.
[13] The present invention also provides a test method for testing mechanical properties of a drill rod, which comprises the steps of:
[14] SI. driving, by the rotary impact propulsion device, the drilling environmental model of the drill rod to simulate the drilling state of the drill rod;
[15] S2, applying, by a radial loading device, a load to the rock-environmental model to simulate the radial compression state of the drill rod in the rock formation;
[16] S3, collecting, by the test device, load data of the rotary impact propulsion device and the radial loading device and carrying out data processing to obtain mechanical property data of the drill rod.
[17] By using an environmental model and a radial loading device, the technical solution of the present invention can simulate the squeezing force/bending load of the rock strata to which the drill rod is subjected during the drilling process, and simulate the axial load and impact load of the driving system to which the drill rod is subjected during the drilling process in combination with the rotary impact propulsion device, and can completely simulate all the force conditions of the drill rod during the drilling process. The experimental results obtained by the test device can more accurately approach the real working data, and are simple and practical, so as to provide accurate data and basis for safe driving and efficient support.
[18] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by a person skilled in the art without creative efforts.
[19] Fig. 1 is a schematic view showing the overall structure of the present invention;
[20] Fig. 2 is a front view of Fig. 1 of the present invention;
[21] Fig. 3 is a cross-sectional view A-A of Fig. 2 of the present invention;
[22] Description of Reference Numerals:
[23] l-environmental model, 2-rotary propulsion device, 201-slideway, 202-propulsion platform, 203-driving motor, 3-impact propulsion device, 4-radial loading device, 5-test device, 501-dynamic torque sensor, 6-fixing truss, 601-ground fixing device, 7-drill rod;
[24] The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without inventive effort fall within the scope of the present invention.
[25] In the description of the present invention, it is to be understood that the terms “center”, "longitudinal", "lateral", "length", "width" "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
[26] Furthermore, the terms “first” and “second” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or 5 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly comprise one or more of the stated features. In the description of the present invention, “a plurality of” refers to two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in detail by a person skilled in the art.
[27] Embodiment 1
[28] As shown in Figs. 1-3, the present invention provides a device for testing mechanical properties of a drill rod, which comprises: an environmental model 1 for simulating a drilling environment of a drill rod 7; a rotary impact propulsion device 3 tor connecting the drill rod 7 and drilling the drill rod 7 towards the environmental model 1; a plurality of radial loading devices 4 respectively arranged around the environmental model 1 and applying a load to the interior of the environmental model 1; a test device 5 connected to the rotary impact propulsion device 3 and the radial loading device 4, and acquiring and processing the obtained data.
[29] Specifically, when the drill rod 7 is drilled into the rock formation or after the process of drilling into the rock formation, the internal pressure of the rock formation itself is also one of the important factors affecting the performance of the drill rod 7, and the environmental model 1 is used for simulating a drilling environment with different degrees of tightness/internal pressure, and the environmental model 1 may specifically be a high-hardness material similar to a target area of a drilling position prepared by various methods, such as chemically prepared concrete, high-temperature tired masonry, etc. or directly excavating the rock formation itself; the rotary impact propulsion device 3 is mainly used for simulating a driving device of the drill rod 7, so that the drill rod 7 rotates and impacts to drill into the environmental model 1, thereby simulating the drilling process of the drill rod 7, wherein the rotation of the drill rod 7 can be realized by an electric motor, and the impact propulsion of the drill rod 7 can be realized by other linear driving methods such as hydraulic propulsion and screw propulsion; the radial loading device 4 is fixedly arranged on the outer surface of the environmental model 1 around the axis of the drill rod 7, and pressurizes the environmental model 1, so that the environmental model 1 maintains an internal force state similar to that of the drill rod 7 after drilling into the rock formation, thereby simulating the force state of the drill rod 7 in the rock formation; the radial loading device 4 can be a hydraulic hammer handle, and the pressurizing direction thereof faces the inside of the environmental model 1; the test device 5 is used for collecting data and processing the data through a preprocessing formula, so as to obtain the mechanical property analysis result of the drill rod 7.
[30] Embodiment 2
[31] The environmental model 1 is further described in this embodiment 2:
[32] the environmental model 1 is rock or simulated rock. Specifically, in the embodiment 2, the environmental model 1 is directly used as rock, for example, before the experiment, a rock can be excavated at the target driving point and transported to the laboratory, and then the rock can be used as the environmental model 1, i.e. whether a certain type of drill rod 7 is able to perform drilling operation in the engineering project can be specifically tested; or after acquiring formation data of the target site, using a chemical or physical method (as in embodiment 1) to make a simulated rock with an intensity close to the target drilling area for use as the environmental model 1; the performance of the drill rod 7 can be effectively tested before the start of the project.
[33] Embodiment 3
[34] This third embodiment further describes the rotary impact propulsion device 3:
[35] As shown in Figs. 1 to 3, the rotary impact propulsion device 3 includes a rotary propulsion device 2 and an impact propulsion device 3. Specifically, since the drill rod 7 1s not only rotated but also axially displaced during drilling, the rotary propulsion device 2 drives the drill rod 7 to rotate rod 7 while driving the drill rod 7 to rotate; the impact propulsion device 3 provides propulsion for the drill rod 7.
[36] The rotary propulsion device 2 comprises a slideway 201, a propulsion platform 202 and a driving motor 203, wherein the slideway 201 is located at one side of the environmental model 1, the propulsion platform 202 is slidably arranged on the slideway 201, the driving motor 203 is fixedly arranged on the propulsion platform 202, and the driving motor 203 is connected to the drill rod 7. Specifically, in the embodiment 3, a specific rotary propulsion device 2 is provided: the length direction of the slideway 201 is parallel to the axis of the drill rod 7, and the bottom of the propulsion platform 202 moves on the slideway 201 via a roller; when the drill rod 7 is axially moved, the driving motor 203 can indirectly move along the slideway 201 due to the presence of the propulsion platform 202, so that rotary propulsion can be achieved; the driving motor 203 is specifically a servo motor, and it is sufficient that the driving motor 203 is connected to the end of the drill rod 7 via a chuck or a coupling.
[37] The impact propulsion device 3 comprises an axial hydraulic thruster, wherein the axial hydraulic thruster is fixedly arranged between the environmental model 1 and the rotary impact propulsion device 3, the drill rod 7 and the axial hydraulic thruster are rotatably connected along the radial direction of the drill rod 7, and the drill rod 7 and the axial hydraulic thruster move in synchronization along the axial direction of the drill rod 7. Specifically, in embodiment 3, a specific impact propulsion device 3 is provided: the fixing end of the axial hydraulic thruster is fixed relative to the environmental model 1, the movable end is connected to the body of the drill rod 7, and drives the drill rod 7 to perform an impact in the axial direction through the action of the movable end, so as to simulate the impact effect of the drill rod 7 during drilling,
and indirectly drives the driving motor 203 to move along the slideway 201; in addition, since the drill rod 7 needs to be rotationally drilled, the drill rod 7 and the axial hydraulic thruster should be rotationally connected, and since the drill rod 7 needs to be axially impacted, the drill rod 7 and the movable end of the axial hydraulic thruster should be axially synchronized, and this structure can be achieved by means of a thrust bearing, which will not be described in detail.
[38] Embodiment 4
[39] The radial loading device 4 is described in embodiment 4:
[40] as shown in Figs. 1-3, the radial loading device 4 comprises radial hydraulic loaders, the environmental model 1 is cylindrical, and a plurality of radial hydraulic loaders are arranged around the outer cylindrical surface of the environmental model 1 and are arranged along the axial direction of the environmental model 1. Specifically, after the drill rod 7 enters the rock formation, the extrusion pressures to which the drill rod 7 is subjected in various directions should be the same and uniform; in order to create such a uniform stressed environment, the environmental model 1 is designed to be cylindrical, and then several radial hydraulic loaders surrounding the outside thereof are uniformly arranged; after the loads applied by the several radial hydraulic loaders are transmitted to the drill rod 7, they should also be uniform to simulate real drilling conditions; certainly, if it is necessary to make the pressures of the environmental model 1 different (for example, the pressure at the top is high, and the pressure at the bottom is low), it is sufficient to adjust the pressures of the radial hydraulic loaders in the corresponding regions; by increasing the load of the radial hydraulic loader, the ultimate compression performance of the drill rod 7 can be measured.
[41] Embodiment 5
[42] The test device 5 is further described in embodiment 5:
[43] as shown in Figs. 1 to 3, the test device 5 comprises a plurality of sensors, a data acquisition system and a data processing system, wherein the sensors are respectively connected to the rotary propulsion device 2, the impact propulsion device 3 and the radial loading device 4, the data acquisition system is connected to the sensors, and the data processing system is connected to the data acquisition system and visually outputs the data processing result. Specifically, in the present invention, the data acquisition system mainly obtains the torsional resistance value of the drill rod 7 by rotating the sensor in the propulsion device 2, obtains the axial force value by impacting the sensor in the impact propulsion device 3, and obtains the radial force value of the drill rod 7 in the environmental model 1 by the sensor in each radial hydraulic loader. The mechanical properties of the drill rod 7 can be analyzed through a combination of these data and can be output in the form of an image through the processing of a data processing system, and the specific formulas and steps for data
IO processing are common methods in experiments and will not be described in detail.
[44] The sensors comprise a pressure sensor and a dynamic torque sensor 501, and the impact propulsion device 3 and the radial loading device 4 are connected to the drill rod 7 via the pressure sensor, and the rotary propulsion device 2 is connected to the drill rod 7 via the dynamic torque sensor 501. Specifically, in the present invention, the pressure value is mainly measured by a pressure sensor between each hydraulic device and the drill rod 7, which need not be described in detail. It should be noted that, since the drill rod 7 is a rotating member in the present invention, it is necessary to use a dynamic torque sensor 501 (working in a manner similar to a coupling) for measuring the torque of the drill rod 7, and such a sensor belongs to the mature products on the market and can be found in both on-line and off-line channels, and the principle thereof will not be described again; the values measured by the pressure sensor and the dynamic torque sensor 501 are transmitted to the data processing system via the data acquisition system.
[45] Embodiment 6
[46] This example 6 also discloses the fixing device of the environmental model 1:
[47] as shown in Figs. 1-3, further included is a fixing truss 6, the environmental model 1 is fixedly arranged in the fixing truss 6, a fixing end of the radial loading device 4 is fixedly connected to the fixing truss 6, and a movable end of the radial loading device 4 is fixedly connected to the environmental model 1. Specifically, since the environmental model 1 is impacted by the drill rod 7, in order to simulate drilling conditions, it is necessary to ensure the stability of the environmental model 1 during drilling, which is realized by the fixing truss 6 in the embodiment 6; the environmental model 1 is fixed in the middle of the fixing truss 6, several fixed square steels are provided on the fixing truss 6 around the environmental model 1, the fixing ends of the radial hydraulic loaders are fixed on these fixed square steels, and the movable end hammer handles of these radial hydraulic loaders are pressed towards the environmental model 1; the bottom of the fixing truss 6 is provided with a ground fixing device 601 for fixedly fixing with a laboratory ground or a laboratory table; the pushing table 202 and the slideway 201 are provided at one side of the fixing truss 6 and directly connected to the fixing truss 6, so that the position of the slideway 201 is indirectly fixed.
[48] Embodiment 7
[49] This Example 7 also discloses a test method using the device of the present invention:
[50] the present invention also provides a test method for testing mechanical properties of a drill rod, which comprises the steps of: S1. driving, by the rotary impact propulsion device 3, the drilling environmental model 1 of the drill rod 7 to simulate the drilling state of the drill rod 7; [S1] S2, applying, by a radial loading device 4, a load to the rock-environmental model 1 to simulate the radial compression state of the drill rod 7 in the rock formation;
[52] S3, collecting, by the test device 5, load data of the rotary impact propulsion device 3 and the radial loading device 4 and carrying out data processing to obtain mechanical property data of the drill rod 7.
[53] Specifically, during the test, the test device 5 replaces the torque and axial force experienced during the drilling of the drill rod 7 with the data of the rotary impact propulsion device 3, and replaces the formation squeezing force experienced during the drilling of the drill rod 7 with the data of the radial loading device 4, so as to test the mechanical properties of the drill rod 7; the specific method of use of these data and the significance characterized by the changes thereof are common experimental wisdom, for example, when the data abruptly changes, indicates that it may reach the yield strength, when the data stops changing, it indicates that it may break, etc. and will not be described in detail. The present invention can not only make various loading devices work at the same time, and measure the data of mechanical properties of the drill rod 7 under real working conditions, but also separately measure the data of various mechanical properties of the drill rod 7 (when subjected to axial force, radial force and torsional force alone) by means of fixed variable method, etc.
[54] Principles of operation of the invention:
[55] the formation is simulated by the environmental model 1, the squeezing force of the formation on the drill rod 7 is simulated by the radial hydraulic loader, the axial impact propulsion of the drill rod 7 is simulated by the axial hydraulic thruster, and the rotation of the drill rod 7 is simulated by the driving motor 203; when the axial hydraulic thruster drives the drill rod 7, the driving motor 203 drives the propulsion platform 202 to move cooperatively on the slideway 201, and acquires, processes data and outputs a test result through the test device 5.
[56] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by a person skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210179478 | 2022-02-25 |
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| Publication Number | Publication Date |
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| NL2033614A NL2033614A (en) | 2023-09-05 |
| NL2033614B1 true NL2033614B1 (en) | 2024-04-16 |
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| NL2033614A NL2033614B1 (en) | 2022-02-25 | 2022-11-25 | Device for testing mechanical property of drill rod and test method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991113B (en) * | 2017-11-13 | 2019-06-11 | 中国矿业大学 | It is a kind of drill, be split up, cutting integration experiment platform and test method |
| CN113216938B (en) * | 2021-06-23 | 2022-05-13 | 中煤科工集团重庆研究院有限公司 | Dynamic comprehensive performance testing device for coal mine drill rod |
| CN113216937B (en) * | 2021-06-23 | 2022-05-20 | 中煤科工集团重庆研究院有限公司 | Dynamic comprehensive performance test method and device for coal mine drill rod |
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