Rotary cutting type rock strength testing device and continuous rock strength testing method

Abstract

According to the technical scheme, the rotary cutting type rock strength testing device is characterized in that the rotary cutting type rock strength testing device comprises a plurality of guide sliding sleeves, a pushing mechanism and a testing scraper, and the guide sliding sleeves are coaxially arranged and used for supporting and guiding a columnar rock sample; the pushing mechanism is used for pushing the rock sample to axially slide along the guide sleeve; the end part of the test scraper abuts against the periphery of the rock sample and is used for a peripheral material cutting test of the rock sample; the device further comprises a rotation driving mechanism, the rotation driving mechanism is used for driving the rock sample to axially rotate, and the rock sample is subjected to axial movement and axial rotation at the same time in the moving process to form spiral movement. According to the invention, the strength of the rock within the full length range in the drilling direction can be tested, so that the strength information of the deep rock can be better judged.

Description

Technical Field

[0001] The present invention relates to rock test equipment, and more specifically, to a rotary scraping rock strength test device, and also to a continuous rock strength test method. Background Art

[0002] The distribution of internal structural planes in rock masses and the strength of deep rocks play a decisive role in the construction of the entire rock mass project. Before construction, it is usually necessary to use a drill rig to drill rocks at different depths and test the strength of rocks at different depths.

[0003] During the detection and test process, since the drill pipe has a fixed length, the depth of the borehole can be reflected by the position of the drill pipe. By intercepting the core at the corresponding position, processing it into a standard-size specimen, and then testing the strength of the specimen at that position, the strength parameters of the rock at that position can be obtained. By testing rock specimens at different depths, the strength of the rock in the entire borehole depth direction can be obtained. However, since the positions where the rock samples are obtained are not continuous, the final obtained rock strength parameters are also discontinuous and cannot continuously reflect the strength of the rock in the entire borehole depth range.

[0004] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a rotary scraping rock strength test device that can test the strength of rocks in the entire length range of the borehole direction, so as to better judge the strength information of deep rocks.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: A rotary scraping rock strength test device includes a plurality of guide sleeves, a pushing mechanism, and a test scraper. The guide sleeves are coaxially arranged and are used to support and guide the columnar rock sample; the pushing mechanism is used to push the rock sample to slide axially along the guide sleeve; the end of the test scraper abuts against the outer periphery of the rock sample and is used for scraping material test on the outer periphery of the rock sample.

[0007] The present invention is further provided that it further includes a rotary drive mechanism, and the rotary drive mechanism is used to drive the rock sample to rotate axially. During the movement of the rock sample, it is simultaneously subjected to axial movement and axial rotation, forming a spiral movement.

[0008] The present invention is further provided that the test scraper scrapes the surface of the passing rock sample for testing, forming spiral test marks on the surface of the rock sample. It further includes a plurality of support wheels, and each support wheel is arranged below the rock sample and is used to support and guide the rotation of the rock sample; the axis of the guide sleeve is inclined, and the rock sample moves obliquely upward in the guide sleeve.

[0009] The present invention is further configured such that the rotary drive mechanism is driven to rotate by a drive motor, and a torque sensor is provided between the output end of the drive motor and the rotary drive mechanism. The torque sensor is used to detect the torque information when the test scraper is inserted to the same depth, and the strength of the rock sample at this position is represented by the torque information.

[0010] The present invention is further configured such that the rotary drive mechanism includes a housing, and three sets of rotary drive wheels are arranged inside the housing. The three sets of rotary drive wheels are respectively abutted against the outer periphery of the rock sample. The wheel shaft of the first set of rotary drive wheels is in transmission connection with the output end of the drive motor, and the rock sample is rotationally driven by active rotation.

[0011] The present invention is further configured such that the first set of rotary drive wheels is located directly below the rock sample, and the other two sets of rotary drive wheels are arranged on both sides above the rock sample and are rotationally supported by an adjustment frame; the adjustment frame can be adjusted up and down. The upper part of the adjustment frame is fixedly connected with a guide slide bar, and the guide slide bar extends vertically; a guide cylinder is provided on the upper part of the housing, and the guide slide bar passes through the guide cylinder and is slidably matched with each other.

[0012] The present invention is further configured such that the rotary drive wheel includes a wheel shaft and two wheel bodies. The two wheel bodies are coaxially installed outside the wheel shaft. A plurality of linkage wheels are arranged on the outer periphery of the wheel body, and the linkage wheels are distributed in an annular array. The axis of the linkage wheel is perpendicular to both the axial and radial directions of the wheel body; the linkage wheel can rotate around the axis and is used for the axial movement of the rock sample during the axial rotation of the rock sample.

[0013] The present invention is further configured such that the linkage wheel has a waist-shaped structure that is large in the middle and small at both ends, and the generatrices on the outer periphery of each linkage wheel are arranged in a common circle; the linkage wheels on the outer peripheries of the two wheel bodies are arranged in a staggered manner to compensate for the gap between adjacent linkage wheels.

[0014] The present invention is further configured such that a linkage frame is provided between the linkage wheels, and the linkage frame is provided with a linkage shaft for rotationally supporting the linkage wheels.

[0015] The present invention is further configured such that the pushing mechanism is a telescopic push rod with a telescopic pushing end that abuts against the axial end face of the rock sample for pushing the rock sample to move axially.

[0016] The present invention is further configured such that the pushing mechanism is a track and a sliding seat. The track is arranged parallel to the axis of the rock sample, and the sliding block is slidably connected to the track and is driven to slide by a driver; a push rod is arranged on the sliding block, and the pushing end of the push rod abuts against the axial end face of the rock sample for pushing the rock sample to move axially.

[0017] The present invention also provides a method for continuously testing the strength of rocks, which uses the above test device for testing; the test device is used to perform spiral driving on a cylindrical rock sample, and a test scraper scrapes the surface of the passing rock sample for testing, forming spiral test marks on the surface of the rock sample; the torque sensor is used to detect the torque information when the test scraper has the same scraping depth, and the strength of the rock sample at this position is represented by the torque information.

[0018] In summary, the present invention has the following beneficial effects:

[0019] A test scraper is used to scrape the rock sample for testing, and the scraping depth of the test scraper on the surface of the rock sample is maintained. Rocks with different strengths require different forces under the same scraping depth; at the same time, a torque sensor is used to detect the magnitude of the force required during the scraping process, and thus the strength parameters of the rock corresponding to this position can be obtained. At the same time, by continuously pushing the drilled rock and combining the scraping of the test scraper on the surface of the rock sample, the strength test of the rock within the full length range of the drilling direction can be carried out, so as to better judge the strength information of the deep rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of a rotary scraping type rock strength test device of the present invention Figure 1 ;

[0021] Figure 2 is a schematic structural view of a rotary scraping type rock strength test device of the present invention Figure 2 ;

[0022] Figure 3 is a schematic structural view of a rotary scraping type rock strength test device of the present invention Figure 3 ;

[0023] Figure 4 is a schematic internal structural view of the rotary driving mechanism of the present invention;

[0024] Figure 5 is a schematic structural view of one wheel body and a linkage wheel of the rotary driving wheel of the present invention;

[0025] Figure 6 is a schematic structural view of another wheel body and a linkage wheel of the rotary driving wheel of the present invention.

[0026] Reference numerals: 1, guide sliding sleeve; 2, support wheel; 21, bracket; 3, pushing mechanism; 31, pushing end; 32, track; 33, sliding seat; 4, test scraper; 41, test stand; 5, rotary drive mechanism; 51, housing; 52, guide sliding cylinder; 6, drive motor; 7, torque sensor; 8, rock sample; 9, rotary drive wheel; 91, wheel axle; 92, wheel body; 93, linkage wheel; 94, generatrix; 95, linkage frame; 96, linkage shaft; 10, adjusting frame; 101, guide sliding rod; 102, counterweight. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] This embodiment discloses a rotary scraping type rock strength test device, as Figure 1 、 2 shown, including a plurality of guide sliding sleeves 1, a pushing mechanism 3 and a test scraper 4. Each guide sliding sleeve 1 is coaxially arranged and supported by a frame, and the columnar rock sample 8 can be supported and guided through the guide sliding sleeve 1; the rock sample 8 can be pushed to slide axially along the guide sleeve through the pushing mechanism 3.

[0029] The bottom of the test scraper 4 is supported and fixed by a test stand 41, and the end of the test scraper 4 abuts against the outer periphery of the rock sample 8. The outer periphery of the rock sample 8 can be subjected to a scraping test through the test scraper 4.

[0030] A rotary drive mechanism 5 is installed between two guide sleeves. The rock sample 8 can be driven to rotate axially through the rotary drive mechanism 5. The rotary drive mechanism 5 is driven to rotate by a drive motor 6, and a torque sensor 7 is installed between the output end of the drive motor 6 and the rotary drive mechanism 5. The information of the torque is detected by the torque sensor 7 when the test scraper 4 scrapes to the same depth, and the strength of the rock sample 8 at this position is represented by the information of the torque.

[0031] During the movement of the rock sample 8, it is simultaneously subjected to axial movement and axial rotation, forming a spiral movement. The test scraper 4 performs a scraping test on the surface of the passing rock sample 8, forming spiral test marks on the surface of the rock sample 8. During the conveying process of the rock sample 8, both the axial movement and axial rotation of the rock sample 8 are kept in a uniform and stable state. The test scraper 4 scrapes off the outer wall of the rock sample 8. Since the position of the test scraper 4 is fixed, the scraping depth of the test scraper 4 on the passing rock sample 8 is also the same. By detecting the torque condition received by the output end of the drive motor 6, the strength information of the surface of the rock sample 8 can be reflected.

[0032] The rotary drive mechanism 5 is provided with a rotary drive wheel 9. The axle 91 of the rotary drive wheel 9 is in transmission connection with the output end of the drive motor 6, and the rock sample 8 is rotationally driven by active rotation. The axle 91 of the rotary drive wheel 9 is in transmission connection with the output end of the drive motor 6 through a transmission mechanism. The drive motor 6 can drive the rotary drive wheel 9 to rotate, and thus can drive the rock sample 8 to rotate. The torque sensor 7 is installed on the output shaft of the drive motor 6, and thus can detect the torque information during the driving process.

[0033] As Figure 1 shown, the test equipment further has a plurality of support wheels 2. Each support wheel 2 is arranged below the rock sample 8 and is rotationally supported by a bracket 21 to ensure that the support wheel 2 can rotate smoothly. Moreover, the axis of the guide sleeve is inclined. The rock sample 8 moves upward obliquely in the guide sleeve. The pushing end 31 of the pushing mechanism 3 abuts against the lower end of the rock sample 8 and is used to stably push the rock sample 8 upward. In addition, since the rock sample 8 is in an inclined state, the end of the rock sample 8 can stably abut against the pushing mechanism 3, avoiding instability during the pushing process and maintaining the stability of the axial movement of the rock sample 8.

[0034] The pushing mechanism 3 can adopt a telescopic push rod, which has a telescopic pushing end 31. The pushing end 31 abuts against the axial end face of the rock sample 8, and the rock sample 8 can be axially moved through the telescopic action. As Figure 1 shown.

[0035] Alternatively, the pushing mechanism 3 can also adopt a structure combining a track 32 and a sliding seat 33. As Figure 3 shown. The track 32 is arranged parallel to the axis of the rock sample 8. The slider is slidably connected to the track 32 and is driven to slide by a driver. A push rod is installed on the slider. The pushing end 31 of the push rod abuts against the axial end face of the rock sample 8. The slider sliding action can drive the push rod, and thus can push the rock sample 8 axially.

[0036] This embodiment also discloses another rotary rock strength test device. On the basis of the above embodiment, with further reference to Figures 4 - 6 for detailed description, the rotary drive mechanism 5 is further designed.

[0037] As Figure 4 shown, the rotary drive mechanism 5 includes a housing 51. Three groups of rotary drive wheels 9 are arranged in the housing 51. The three groups of rotary drive wheels 9 respectively abut against the outer periphery of the rock sample 8. The axle 91 of the first group of rotary drive wheels 9 is in transmission connection with the output end of the drive motor 6, and the rock sample 8 is rotationally driven by active rotation. The torque sensor 7 is installed between the output end of the drive motor 6 and the axle 91 of the first group of rotary drive wheels 9, and thus can realize torque detection to obtain the strength information of the rock sample 8.

[0038] As Figure 4 shown, the first set of rotary drive wheels 9 are located directly below the rock sample 8, and the other two sets of rotary drive wheels 9 are arranged on both sides above the rock sample 8 and are rotatably supported by the adjusting frame 10. The two rotary drive wheels 9 above can press against the rock sample 8, thereby maintaining the pressure between the rotary drive wheels 9 and the surface of the rock sample 8, and further maintaining the stability during the driving process to prevent slipping between the rotary drive wheels 9 and the rock sample 8.

[0039] The adjusting frame 10 can be adjusted up and down. A guide slide rod 101 is fixedly connected to the upper part of the adjusting frame 10, and the guide slide rod 101 runs vertically. A guide cylinder is provided in the upper part of the housing 51, and the guide cylinder also runs vertically and is slidably adapted to the guide rod. The guide slide rod 101 passes through the guide cylinder, enabling the stable lifting of the adjusting frame 10 and the two sets of rotary drive wheels 9 on the adjusting frame 10. Through the lifting action of the adjusting frame 10, it can thus adapt to rock samples 8 of different diameters.

[0040] As Figures 4 - 6 shown, each set of rotary drive wheels 9 includes a wheel shaft 91 and two wheel bodies 92. The two wheel bodies 92 are coaxially installed outside the wheel shaft 91, and a number of linkage wheels 93 are provided on the outer periphery of the wheel body 92, and the linkage wheels 93 are distributed in an annular array. The axis of the linkage wheel 93 is perpendicular to both the axial and radial directions of the wheel body 92; moreover, the linkage wheel 93 can rotate around the axial direction, enabling the rotary drive wheel 9 to allow the rock sample 8 to axially move during the axial rotation of the rock sample 8. Through the rotation of the linkage wheel 93, sliding guidance can be provided for the rock sample 8 to maintain the axial stability of the sliding of the rock sample 8.

[0041] As Figure 5 、 6 shown, the linkage wheel 93 has a waist drum-shaped structure that is larger in the middle and smaller at both ends. The linkage wheel 93 is a rotating body structure, and the contour shape of the linkage wheel 93 is obtained by rotating the bus bar 94 on the outer periphery around the axis for one week. Observed from the axial direction of the wheel shaft 91, the bus bars 94 on the outer periphery of each linkage wheel 93 are arranged in a common circle, that is, during the rotation of the rotary drive wheel 9, the outer peripheral end faces of the linkage wheels 93 are pressed against the rock sample 8. During the pressing rotation process, the position where the outer periphery of the linkage wheel 93 contacts the rock sample 8 always remains at a circular contour with the wheel shaft 91 as the center, thereby being able to maintain the transmission stability between the rotary drive wheel 9 and the rock sample 8.

[0042] On the outer periphery of the wheel body 92, a linkage frame 95 is fixed corresponding to the linkage wheel 93. Linkage shafts 96 are fixed on both sides of the linkage frame 95. Through the linkage shafts 96, the linkage wheel 93 can be rotatably supported, enabling the linkage wheel 93 to perform a stable axial rotation linkage action relative to the wheel body 92.

[0043] Since there is a certain gap between the linkage wheels 93 on the outer periphery of the same wheel body 92, two wheel bodies 92 need to be arranged simultaneously in the same rotary drive wheel 9. The linkage wheels 93 on the outer peripheries of the two wheel bodies 92 are arranged in a staggered manner. The gap of the linkage wheel 93 on the outer periphery of one wheel body 92 is compensated by the linkage wheel 93 on the outer periphery of the other wheel body 92. Through mutual compensation, it can be ensured that, viewed from the axial direction, the outer circumferential bus 94 of the linkage wheels 93 on the outer periphery of the rotary drive wheel 9 can enclose a complete circle, thereby enhancing the stability of the rotary drive wheel 9 during the axial rotation of the rock sample 8.

[0044] During the process of the rotary drive wheel 9 driving the rock sample 8, the axial rotation of the rotary drive wheel 9 drives the rock sample 8 to generate an axial rotation motion. Combined with the axial rotation of the linkage wheel 93, it can adapt to the axial movement of the rock sample 8 simultaneously generated. In the axial movement direction of the rock sample 8, between the rock sample 8 and the linkage wheel 93, through the self-rotation of the linkage wheel 93 around the linkage shaft 96, the stability between the rock sample 8 and the linkage shaft 96 is maintained. There is relative rolling between the two, and no relative frictional slip occurs; in the axial rotation direction of the rock sample 8, a relative rolling motion also occurs between the outer periphery of the rock sample 8 and the linkage wheel 93. The rotation of the rock sample 8 is driven by friction, and no relative frictional slip occurs between the rock sample 8 and the linkage shaft 96 either. Thus, the stable helical motion of the rock sample 8 can be maintained, preventing the generation of additional frictional resistance between the rock sample 8 and the rotary drive wheel 9 during the helical movement process, which may have an additional impact on the torque parameter, and thus facilitating the maintenance of the accuracy of the strength test of the rock sample 8.

[0045] This embodiment discloses a method for continuous rock strength test, which uses the test device in the above-mentioned embodiment for the test.

[0046] Before the test, first use this test device to test standard rock samples 8 with the same diameter. The standard rock samples 8 can be artificially prepared standard rock samples 8, and their external strength parameters are already known. Through the test of the standard rock samples 8, by keeping the depth of scraping the material by the scraper consistent during the test process, the torque value during the test of the rock sample 8 under this strength parameter can be obtained; by testing multiple groups of standard rock samples 8 with different strengths, the torque values under different strength parameters can be obtained, and then the approximate graph or curve trajectory of different torques corresponding to the tests of the rock sample 8 under different strength parameters can be obtained.

[0047] During the test process, place the rock sample 8 to be tested in the test device. The rock sample 8 is conveyed through the guide sleeve 1. The test device performs spiral drive on the cylindrical rock sample 8, and the test scraper 4 scrapes the surface of the passing rock sample 8 for the test, forming spiral test marks on the surface of the rock sample 8.

[0048] The information of the torque of the test scraping knife 4 is detected by the torque sensor 7 when the scraping depth is the same. Then, by comparing the torque information at the corresponding position with the test of the previous standard rock sample 8, the approximate strength parameters of the rock sample 8 at the corresponding position can be obtained through the torque information. This test process realizes the strength test of the rock within the full length of the drilling direction by continuously jacking the rock sample 8, and can more efficiently test the strength information of the rock sample 8 so as to better judge the strength information of the deep rock.

[0049] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A rotary scraping type rock strength test device, characterized in that, It includes several guide sleeves (1), a pushing mechanism (3) and a test scraper (4). Each guide sleeve (1) is coaxially arranged and is used to support and guide a columnar rock sample (8); the pushing mechanism (3) is used to push the rock sample (8) to slide axially along the guide sleeve; the end of the test scraper (4) abuts against the outer periphery of the rock sample (8) and is used for scraping material on the outer periphery of the rock sample (8).

2. The rotary scraping type rock strength test device according to claim 1, characterized in that, It further includes a rotary drive mechanism (5). The rotary drive mechanism (5) is used to drive the rock sample (8) to rotate axially. During the movement of the rock sample (8), it is simultaneously axially moved and axially rotated to form a helical motion.

3. The rotary scraping type rock strength test device according to claim 1, characterized in that, The test scraper (4) scrapes the surface of the passing rock sample (8) for a test, forming a helical test trace on the surface of the rock sample (8). It also includes several support wheels (2). Each support wheel (2) is arranged below the rock sample (8) and is used to rotate, support and guide the rock sample (8); the axis of the guide sleeve is inclined, and the rock sample (8) moves upward obliquely in the guide sleeve.

4. The rotary rock strength test device according to claim 2, wherein, The rotary drive mechanism (5) is driven to rotate by a drive motor (6), and a torque sensor (7) is arranged between the output end of the drive motor (6) and the rotary drive mechanism (5).

5. The rotary cutting rock strength test device according to claim 4, characterized in that, The rotary drive mechanism (5) includes a housing (51). Three rotary drive wheels (9) are arranged in the housing (51). The three rotary drive wheels (9) respectively abut against the outer periphery of the rock sample (8). The axle (91) of the first group of rotary drive wheels (9) is in transmission connection with the output end of the drive motor (6), and the rock sample (8) is rotationally driven by active rotation.

6. The rotary scraping type rock strength test device according to claim 5, characterized in that, The first group of rotary drive wheels (9) is located directly below the rock sample (8), and the other two groups of rotary drive wheels (9) are arranged on both sides above the rock sample (8) and are rotationally supported by an adjusting frame (10); the adjusting frame (10) can be adjusted up and down. The upper part of the adjusting frame (10) is fixedly connected with a guide slide bar (101), and the guide slide bar (101) extends up and down; a guide cylinder is provided in the upper part of the housing (51), and the guide slide bar (101) passes through the guide cylinder and is slidably adapted to each other.

7. The rotary scraping type rock strength test device according to claim 6, wherein, The rotary drive wheel (9) includes an axle (91) and two wheel bodies (92). The two wheel bodies (92) are coaxially installed outside the axle (91). A number of linkage wheels (93) are arranged on the outer periphery of the wheel body (92). Each linkage wheel (93) is distributed in an annular array. The axis of the linkage wheel (93) is perpendicular to both the axial direction and the radial direction of the wheel body (92); the linkage wheel (93) can rotate around the axial direction and is used to allow the rock sample (8) to move axially during the process of driving the rock sample (8) to rotate axially.

8. A rotary scraping type rock strength test device according to claim 7, characterized in that, The linkage wheel (93) has a waist drum-shaped structure with a large middle and small ends. The generatrices (94) on the outer periphery of each linkage wheel (93) are arranged on the same circle; the linkage wheels (93) on the outer peripheries of the two wheel bodies (92) are arranged in a staggered manner to compensate for the gap between adjacent linkage wheels (93).

9. The rotary scraping type rock strength test device according to claim 8, characterized in that, A linkage frame (95) is arranged between the linkage wheels (93). The linkage frame (95) is provided with a linkage shaft (96), and the linkage shaft (96) is used to rotationally support the linkage wheel (93).

10. A continuous test method for rock strength, characterized in that Conduct tests using the test device described in any one of claims 1-9; perform spiral driving on a cylindrical rock sample (8) through the test device, and the test scraper (4) performs scraping tests on the surface of the passing rock sample (8) to form spiral test marks on the surface of the rock sample (8); detect the torque information of the test scraper (4) when the scraping depth is the same through the torque sensor (7), and represent the strength of the rock sample (8) at this position through the torque information.

Images