Rock Strength Detection Distance Measuring Device, Rock Strength Detector and Usage Method

Abstract

The present invention discloses a rock strength detection distance-setting device, a rock strength detector, and a usage method. The rock strength detection distance-setting device includes a fixing ring, adjusting nuts, and threaded columns; the fixing ring is fixed on the outer shell of the strength detector; a plurality of adjusting nuts are arranged on the fixing ring, and the threaded columns are in threaded connection with the adjusting nuts. The height of the threaded columns is adjusted by rotating the threaded columns. At least two threaded columns are provided, and the plurality of threaded columns are evenly distributed in the circumferential direction of the fixing ring; the number of the adjusting nuts is greater than or equal to the number of the threaded columns. According to the characteristic of the uneven rock surface, the present invention uses a plurality of threaded columns to define the acceleration path length of the impact shell, and adjusts the height of the threaded columns by rotating the threaded columns, which can ensure that the ends of the threaded columns are all in contact with the rock surface and has good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and particularly to a device for determining the distance of rock strength detection, a rock strength detector, and a using method. Background Art

[0002] In the field of geotechnical engineering, rock strength detection is an important task for evaluating whether a rock is suitable as a building structure or for evaluating its long-term stability as a bearing. The existing rock strength detections mainly adopt two methods: rock mechanics tests and rebound hammer detections. Rock mechanics tests are to make rock specimens and determine the rock strength through indoor uniaxial / triaxial strength tests and point load tests. The rebound hammer detection is a non-destructive detection carried out in situ on the rock. The principle of the rebound hammer detection is that after the heavy hammer of the rebound hammer impacts the impact rod in contact with the rock surface with a certain kinetic energy, the heavy hammer rebounds and drives the pointer inside the rebound hammer to move at the same time, obtaining a rebound value, and then using this value to calculate the rock strength.

[0003] The problems existing in the existing rock mechanics tests are: (1) Rock samples require a series of processes such as sampling, transportation, handling, specimen preparation, and testing, with relatively high test costs and relatively complex test operations; (2) Considering the test costs, only representative rocks can be selected for testing, and universal tests cannot be carried out.

[0004] The problems existing in the existing rebound hammer detections are: (1) When the heavy hammer rebounds, the spring connected to the heavy hammer will continuously compress and stretch, causing errors in the pointer reading; (2) The rebound hammer drives the heavy hammer to fire by applying force to the impact rod, and can only be used for hard rocks and cannot be applied to the strength detection of some soft rock zones; (3) The rock will absorb a part of the impact energy generated by the heavy hammer, and the absorbed impact energy is different when applied to different types of rocks, resulting in certain errors in the obtained strength detection results.

[0005] Converting / calculating the strength value through the impact sound decibel value has been studied in various fields. The principle of calculating the strength value through the impact sound decibel value is that the impact sounds generated by components with different strengths (such as concrete) are different. The impact sound is collected by the sound level meter probe, and the strength value is converted according to the formula based on the size of the measured impact sound. During the process of collecting the measured impact sound, it is necessary to determine the distance of the impact path of the sound level meter probe to measure accurately. The existing research is mainly based on planar strength value detection, and the distance determining mechanism usually used is a cylinder. When in use, one end of the cylinder is placed on the surface of the object to be measured, and when impacting, the sound level meter probe pops out and passes through the cylinder to impact the surface of the object to be measured.

[0006] However, since the surface of the rock is not a flat surface and has large and small pits, therefore, the existing cylinder distance determination is not applicable to the strength detection of rocks. So, there is an urgent need to design a distance determination device that can be applied to the strength detection of rocks. Summary of the Invention

[0007] The object of the present invention is to provide a distance - setting device for rock strength detection, which can be applied to geotechnical strength detection and the distance - setting length is adjustable.

[0008] In addition, the present invention also provides a rock strength detector including the above - mentioned distance - setting device for rock strength detection and its using method.

[0009] The present invention is realized by the following technical solutions:

[0010] The distance - setting device for rock strength detection includes a fixed ring, adjusting nuts and threaded columns;

[0011] The fixed ring is fixed on the outer shell of the strength detector;

[0012] A plurality of adjusting nuts are arranged on the fixed ring, and the threaded columns are threadedly connected with the adjusting nuts. By rotating the threaded columns, the height of the threaded columns can be adjusted. At least two threaded columns are provided, and the plurality of threaded columns are evenly distributed in the circumferential direction of the fixed ring; the number of adjusting nuts is greater than or equal to the number of threaded columns.

[0013] One end of the threaded column of the present invention that cooperates with the adjusting nut is provided with an external thread, and the adjusting nut is provided with an internal thread. By rotating the threaded column, the height of the threaded column can be adjusted. The height of the threaded column specifically refers to the distance from the end of the threaded column far from the adjusting nut to the adjusting nut. When the threaded column rotates clockwise, the threaded column retracts inward and the height of the threaded column decreases. When the threaded column rotates counter - clockwise, the threaded column moves outward and the height of the threaded column increases.

[0014] Since the surface of the rock is uneven, if the existing sleeve limits the acceleration path length of the impact shell, it will cause the end of the sleeve not to be in full contact with the rock surface, resulting in instability when placing the sleeve on the rock surface.

[0015] According to the characteristics of the uneven rock surface, the present invention uses a plurality of threaded columns to limit the acceleration path length (the reciprocating distance of the impact spring). By rotating the threaded columns to adjust the height of the threaded columns, it can ensure that the ends of the threaded columns are in contact with the rock surface, having good stability.

[0016] That is, the distance - setting device of the present invention can not only be applied to geotechnical strength detection, but also the distance - setting length (acceleration path length) is adjustable.

[0017] Further, the end of the threaded column far from the adjusting nut is provided with a positioning end, and the positioning end is a conical surface structure, and the end is the small end of the conical surface structure.

[0018] On one hand, the conical structure end of the present invention can better adapt to the pits on the rock surface. Even for relatively small pits (with dimensions smaller than the threaded post), the end of the threaded post can be in extrusion contact with the rock surface. Moreover, the conical structure end has a relatively small contact area with the rock surface. Since the rock surface is a non-smooth (rough) surface, there is a large frictional force between the conical structure end and the rock surface, which can improve the stability of the extrusion contact between the threaded post and the rock surface.

[0019] Furthermore, the position of the adjusting nut in the circumferential direction of the fixed ring is adjustable.

[0020] That is, according to the specific pit conditions on the rock surface, the relative position relationship between multiple threaded posts can be appropriately adjusted, so that the rock strength detection distance measuring device of the present invention can be more suitable for distance measurement on the rock surface.

[0021] Furthermore, an annular groove is provided on the outer side surface of the fixed ring, and a protrusion matching with the annular groove is provided on the outer wall of the adjusting nut. The protrusion can slide along the circumferential direction of the fixed ring in the annular groove, and the protrusion and the annular groove are fixed by a plug rod or a threaded rod.

[0022] After sliding the adjusting nut to a suitable position, the adjusting nut is locked by a plug rod or a threaded rod.

[0023] Furthermore, a plurality of radial through holes are provided on the fixed ring, and the radial through holes are used for detachably connecting with the housing of the strength detector.

[0024] A rock strength detector, comprising a housing, an impact shell, a sound level meter, a sliding block, a shock spring, a limiting mechanism and a data processing module; and the above-mentioned distance measuring device;

[0025] The sliding block is slidably arranged in the housing. The impact shell and the shock spring are respectively arranged at both ends of the sliding block. One end of the impact shell away from the sliding block is a closed end, and both ends of the shock spring are respectively connected with the sliding block and the end of the housing;

[0026] The sound level meter is fixed in the impact shell and is used for collecting the decibel value of the impact sound generated when the impact shell impacts the rock;

[0027] The data processing module is used for extracting and processing the decibel value of the impact sound collected by the sound level meter;

[0028] The limiting mechanism is used for limiting and blocking the sliding block;

[0029] The distance measuring device is used for limiting the acceleration path length of the impact shell; the fixed ring is installed on the outer wall of the housing, and the end of the threaded post contacts the rock.

[0030] The principle of the rock strength detector of the present invention for detecting rock strength is as follows:

[0031] The impact sound produced when the impact shell hits rocks of different strengths is different. Since the impact shell is closed, the sound level meter probe inside the impact shell can measure the size of the impact sound, and the intensity value can be converted / calculated through the decibel value of the impact sound.

[0032] The rock strength detector of the present invention belongs to in-situ non-destructive testing, does not require operations such as sampling and sample preparation, and will not cause any damage to the rock and soil.

[0033] The sound level meter and data processing module described in the present invention are both existing electronic devices.

[0034] Further, the limiting mechanism includes a fixed guide rod, a bolt, a firing button, a limiting nut, a key spring and a hook;

[0035] One end of the fixed guide rod is fixed on the sliding block, and the other end is close to the tail end of the housing. The bolt is fixed at the tail end of the housing. The key spring, the limiting nut and the firing button are sequentially sleeved on the bolt, and the firing button protrudes from the tail end of the housing;

[0036] One end of the hook is connected to the bolt, and the other end is used to limit the fixed guide rod. When the firing button is pressed and released, the hook can rotate. When the hook rotates to a position where it cooperates with the fixed guide rod, the displacement of the fixed guide rod in the length direction of the housing is limited.

[0037] Further, a brim is provided at one end of the fixed guide rod that cooperates with the hook, and the hook can hook the end face of the brim away from the tail end of the housing.

[0038] Further, the hook is connected to the tail end of the housing through a rotating shaft, and when the firing button is pressed and released, the hook can rotate around the rotating shaft.

[0039] The usage method of the rock strength detector includes the following steps:

[0040] S1. Push the impact shell into the housing until the fixed guide rod is hooked by the hook;

[0041] S2. Select the measurement mode of the detector and reset and clear the data;

[0042] S3. Place the end of the threaded column on the rock and adjust the height of each threaded column according to the pits on the rock surface at the placement position so that the ends of each threaded column are in contact with the rock surface;

[0043] S4. Slowly press the firing button, the impact shell pops out and hits the rock surface, and slowly release the firing button after hearing the impact sound;

[0044] S5. The impact sound decibel value is collected by a sound level meter and transmitted to the data processing module, which calculates the strength value of the rock based on the maximum decibel value within the time period of pressing and releasing the firing button.

[0045] Specifically: A conversion formula between the decibel value and the strength value is stored in the data processing module, and this formula is prior art. Therefore, when the data processing module obtains the decibel value, it can directly calculate the strength value of the rock according to the formula.

[0046] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0047] 1. According to the characteristic of the uneven rock surface, the present invention uses multiple threaded posts to limit the acceleration path length of the impact shell, and adjusts the height of the threaded posts by rotating them, which can ensure that the ends of the threaded posts are in contact with the rock surface. That is, the fixed distance length of the present invention can be adjusted to adapt to the fixed distance of the uneven rock surface.

[0048] 2. By designing the end of the threaded post as a conical surface structure and designing the adjusting nut to be adjustable at the position of the fixed ring, the rock strength detection fixed-distance device of the present invention can be more suitable for the fixed distance of the rock surface.

[0049] 3. The limiting mechanism of the present invention uses a hook and a fixed guide rod to cooperate to limit the sliding block in the sliding direction of the sliding block (the length direction of the outer shell), and has a good limiting effect. Moreover, the present invention uses a firing button to trigger the impact spring to generate a huge resilience force, which has the advantage of instantaneous response.

[0050] 4. The rock strength detector of the present invention obtains the rock strength by measuring the impact sound generated during the impact, and has high accuracy and reliability, and can realize in-situ non-destructive detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0052] Figure 1 is the overall structural schematic diagram of the rock strength detection fixed-distance device of the present invention;

[0053] Figure 2 is the partial structural schematic diagram of the rock strength detection fixed-distance device of the present invention;

[0054] Figure 3 is the top view of the adjusting nut of the present invention;

[0055] Figure 4 is the structural schematic diagram of the rock strength detector of the present invention in the retracted state;

[0056] Figure 5 This is a schematic structural diagram of the rock strength detector of the present invention in the extended state.

[0057] Markings in the drawings and corresponding component names:

[0058] 1 - Outer shell, 2 - Front cover, 3 - Rear cover, 4 - Battery, 5 - Data processing module, 6 - Display, 7 - Distance setting device, 8 - Impact shell, 9 - Sound level meter, 10 - Slide block, 11 - Impact spring, 12 - Fixed guide rod, 13 - Bolt, 14 - Firing button, 15 - Limit nut, 16 - Button spring, 17 - Hook, 18 - Electric wire, 71 - Fixed ring, 72 - Adjusting nut, 73 - Threaded column, 74 - Positioning end, 75 - Protrusion, 76 - Insert rod. Specific embodiments

[0059] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0060] Embodiment 1:

[0061] As Figures 1-3 shown, the distance setting device for rock strength detection includes a fixed ring 71, an adjusting nut 72 and a threaded column 73; the fixed ring 71 is fixed on the outer shell 1 of the strength detector. The fixed ring 71 can be directly fixed on the outer wall of the outer shell 1 by welding, and the fixed ring 71 can be detachably connected to the outer shell 1. The specific implementation method can be: multiple radial through holes are provided on the fixed ring 71, and threaded holes corresponding to the radial through holes are provided on the outer wall of the outer shell 1. A radial bolt passes through the radial through hole and is fixed in the threaded hole to realize the detachable connection between the fixed ring 71 and the outer shell 1.

[0062] A plurality of adjusting nuts 72 are provided on the fixing ring 71, and the plurality of adjusting nuts 72 are evenly distributed in the circumferential direction of the fixing ring 71. The adjusting nuts 72 have the same axis as the fixing ring 71. One end of the threaded post 73 is threadedly connected to the adjusting nut 72, and the height of the threaded post 73 is adjusted by rotating the threaded post 73. The other end is used to contact the rock. At least two threaded posts 73 are provided, and three or four can be provided. The plurality of threaded posts 73 are evenly distributed in the circumferential direction of the fixing ring 71; the number of adjusting nuts 72 is greater than or equal to the number of threaded posts 73, that is, the adjusting nuts 72 and the threaded posts 73 do not have to correspond one by one, and an appropriate number of threaded posts 73 can be installed according to needs. For example: six adjusting nuts 72 are evenly arranged, and the threaded posts 73 can be connected in three adjusting nuts 72. The three threaded posts 73 and the adjusting nuts 72 without installed threaded posts 73 are arranged at intervals. When actually used, when the end of the threaded post 73 is in extrusion contact with the rock, if the three threaded posts 73 cannot well realize the positioning of the extrusion contact with the rock, add threaded posts 73 at appropriate positions according to the actual situation.

[0063] In a preferred case, in order to further improve the stability of the contact between the end of the threaded post 73 and the rock surface, a positioning end 74 is provided at the end of the threaded post 73 away from the adjusting nut 72. The positioning end 74 is a conical surface structure. The conical surface structure can not only be applicable to the concave pits on the rock surfaces of different sizes, but also, because the rock surface is a non-smooth surface, it can improve the friction between the two, and further improve the stability of the contact between the end of the threaded post 73 and the rock surface.

[0064] In a preferred case, in order to further improve the stability of the contact between the end of the threaded post 73 and the rock surface, the position of the adjusting nut 72 in the circumferential direction of the fixing ring 71 is adjustable. The specific way to realize the adjustable position of the adjusting nut 72 is as follows:

[0065] As Figure 2 、 Figure 3 shown, an annular groove is provided on the outer side surface of the fixing ring 71, and a protrusion 75 matching the annular groove is provided on the outer wall of the adjusting nut 72. The protrusion 75 can slide along the circumferential direction of the fixing ring 71 in the annular groove, and the protrusion 75 and the annular groove are fixed by a plug rod 76 or a threaded rod.

[0066] Specifically, a first through hole is provided on the upper side wall of the annular groove, and a second through hole is provided on the protrusion 75. The second through hole corresponds to the first through hole. The plug rod 76 or the threaded rod can pass through the first through hole and be fixed in the second through hole. The plug rod 76 has a clearance fit with the first through hole and the second through hole. When the first through hole, the second through hole and the threaded hole are aligned, the threaded rod is threadedly connected to the first through hole and the second through hole.

[0067] Embodiment 2:

[0068] As shown Figures 1-5 in FIG., a rock strength detector includes a housing 1, an impact housing 8, a sound level meter 9, a sliding block 10, an impact spring 11, a limiting mechanism, and a data processing module 5; and a distance setting device 7 of Embodiment 1;

[0069] The sliding block 10 is slidably disposed within the housing 1, i.e., the outer wall of the sliding block 10 contacts the inner wall of the housing 1. The housing 1 has a limiting and guiding effect on the sliding block 10. Preferably, a lubricant is coated on the inner wall of the housing 1 to reduce the frictional force between the sliding block 10 and the inner wall of the housing 1 when the sliding block 10 slides.

[0070] In this embodiment, both ends of the housing 1 are open ends. A front cover 2 and a rear cover 3 are respectively disposed at both ends of the housing 1. The front cover 2 and the rear cover 3 are respectively disposed at the front end and the rear end of the housing 1. A through hole for passing through the impact housing 8 is provided on the front cover 2, and a wire groove for passing through the wire 18 is further provided on the rear cover 3.

[0071] The impact housing 8 and the impact spring 11 are respectively disposed at both ends of the sliding block 10. The end of the impact housing 8 away from the sliding block 10 is a closed end. Both ends of the impact spring 11 are respectively connected to the sliding block 10 and the rear cover 3; the impact housing 8 can rush out of the housing 1 under the restoring force of the impact spring 11 and move along the threaded column 73 to impact the rock surface.

[0072] The sound level meter 9 is fixed within the impact housing 8. The end of the impact housing 8 connected to the sliding block 10 is an open end. One end of the sound level meter 9 is connected to the sliding block 10. The sound level meter 9 is used to collect the decibel value of the impact sound generated when the impact housing 8 impacts the rock; preferably, sealing rings are provided at the connections of the sound level meter 9, the impact housing 8, and the sliding block 10 to ensure that the sound level meter 9 is placed in a sealed cavity.

[0073] The data processing module 5 is used to extract and process the decibel value of the impact sound collected by the sound level meter 9. The data processing module 5 is electrically connected to the sound level meter 9 through a wire 18. Preferably, the wire 18 is a spiral cable to adapt to the displacement of the sound level meter 9. A through hole for passing through the wire 18 is provided on the sliding block 10. The data processing module 5 includes a controller, a memory, a communication module, etc. An exchange formula between the decibel value of the impact sound and the strength is stored therein, and the strength of the rock can be directly calculated according to the obtained decibel value of the impact sound.

[0074] The limiting mechanism is used to limit and block the sliding block 10 and can realize the instantaneous excitation of the impact housing 8; a specific implementation structure of the limiting mechanism is:

[0075] The limiting mechanism includes a fixed guide rod 12, a bolt 13, a firing button 14, a limiting nut 15, a key spring 16, and a hook 17;

[0076] One end of the fixed guide rod 12 is fixed on the sliding block 10, and the other end is close to the tail end of the housing 1. A brim is provided at the other end, which cooperates with the hook 17. The bolt 13 is fixed on the rear cover 3, and the key spring 16, the limit nut 15, and the firing button 14 are sequentially sleeved on the bolt 13, and the firing button 14 protrudes from the rear cover 3.

[0077] One end of the hook 17 is connected to the bolt 13, and the other end is used to limit the fixed guide rod 12. The specific limiting method is that the hook 17 hooks the end face of the brim away from the rear cover 3. When the firing button 14 is pressed and released, the hook 17 can rotate around the rotating shaft. When the hook 17 rotates to the position where it cooperates with the fixed guide rod 12, the displacement of the fixed guide rod 12 in the length direction of the housing 1 is limited.

[0078] The bolt 13, the firing button 14, the limit nut 15, the key spring 16, and the hook 17 constitute the instrument firing system. The assembly method of the firing system is as follows:

[0079] The bolt 13 passes through the rear cover 3 and penetrates into the key spring 16, compressing the key spring 16. Then, the limit nut 15 is sleeved on the bolt 13 to fix the key spring 16 through the limit nut 15. Then, the key spring 16 is further compressed to push the firing button 14 out of the rear cover 3 from the inside of the rear cover 3. Then, the key spring 16 is continuously compressed through the limit nut 15, so that the bolt 13 passes through the through hole at the end of the hook 17 (there is a round hole on the connection side of the hook 17 and the bolt 13, and they are connected through the hole and the bolt 13). Finally, the limit on the key spring 16 is released, and the bolt 13 passes through the hook 17 and then penetrates into the firing button 14. Finally, the limit nut 15 is adjusted to an appropriate limiting position to complete the assembly of the firing system.

[0080] The hook 17 is provided with a rotating shaft and is connected to the inner wall of the rear cover 3 through the rotating shaft, and can rotate around the rotating shaft when the firing button 14 is pressed and released. Its function is to fix the fixed guide rod 12. The function of the key spring 16 is to be compressed when the firing button 14 is pressed, so that the hook 17 can rotate and release the restraint on the fixed guide rod 12. After the firing button 14 is released, the key spring 16 drives the hook 17 to rotate under the action of the restoring force, realizing the fixation of the fixed guide rod 12.

[0081] When the hook 17 hooks the fixed guide rod 12, the impact spring 11 is in a compressed state, and the end of the impact shell 8 slightly protrudes outside the front cover 2. When the firing button 14 is pressed, the hook 17 loses the fixation of the fixed guide rod 12. Under the huge restoring force of the impact spring 11, the sliding block 10 drives the impact shell 8 to move forward along the axis of the housing 1 to the maximum position, and the end of the impact shell 8 impacts the rock surface.

[0082] The distance - limiting device 7 is used to limit the acceleration path length of the impact shell 8; the fixed ring 71 is installed on the outer wall of the housing 1, and the end of the threaded column 73 contacts the rock.

[0083] In a preferred embodiment, the rock strength detector further includes a battery 4 and a display 6, which are electrically connected to the data processing module 5. The battery 4 is used to supply power to the electronic devices of the rock strength detector, and the display 6 is used to display the processing results of the data processing module 5 and the decibel value of the impact sound collected by the sound level meter 9.

[0084] Exemplarily: the housing 1, the front cover 2, the rear cover 3, the sliding block 10, and the impact housing 8 are all circular; the front cover 2 and the rear cover 3 are bolted to the housing 1, and the sound level meter 9, the impact housing 8 and the sliding block 10 are bolted together, and the display 6, the data processing module 5, and the battery 4 are bolted to the housing 1.

[0085] The usage method of the rock strength detector according to this embodiment includes the following steps:

[0086] S1. Push the impact housing 8 into the interior of the housing 1 until the fixed guide rod 12 is hooked by the hook 17;

[0087] S2. Turn on the battery 4 switch, select the measurement mode, reset and clear the data, and check whether the data on the display 6 is normal;

[0088] S3. Place the end of the threaded post 73 on the rock, and adjust the height of each threaded post 73 according to the pits on the rock surface at the placement position, so that the ends of each threaded post 73 are in contact with the rock surface. The number of threaded posts 73 and the position of the adjusting nut 72 can also be adjusted according to the situation, so that the ends of each threaded post 73 are in contact with the rock surface and have better stability;

[0089] S4. Slowly press the firing button 14, the impact housing 8 pops out and impacts the rock surface, and slowly release the firing button 14 after hearing the impact sound;

[0090] S5. The sound level meter 9 collects the decibel value of the impact sound and transmits it to the data processing module 5, and the data processing module 5 calculates the strength value of the rock based on the maximum decibel value during the period when the firing button 14 is pressed and released.

[0091] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0092] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

Claims

1. Rock strength detector, characterized in that, It includes a housing, an impact shell, a sound level meter, a sliding block, an impact spring, a limiting mechanism, a data processing module and a distance setting device; The sliding block is slidably arranged in the housing. The impact shell and the impact spring are respectively arranged at both ends of the sliding block. The end of the impact shell away from the sliding block is a closed end. Both ends of the impact spring are respectively connected to the sliding block and the end of the housing. The sound level meter is fixed in the impact shell and is used to collect the decibel value of the impact sound generated when the impact shell impacts the rock. The data processing module is used to extract and process the decibel value of the impact sound collected by the sound level meter; The distance setting device is used to limit the acceleration path length of the impact shell. The distance setting device includes a fixing ring, an adjusting nut and a threaded column. The fixing ring is installed on the outer wall of the housing. A plurality of adjusting nuts are arranged on the fixing ring. The threaded column is threadedly connected with the adjusting nut. The end of the threaded column contacts the rock. The height of the threaded column is adjusted by rotating the threaded column. At least two threaded columns are provided, and a plurality of threaded columns are evenly distributed in the circumferential direction of the fixing ring. The number of adjusting nuts is greater than or equal to the number of threaded columns; The limiting mechanism is used to limit and block the sliding block. The limiting mechanism includes a fixed guide rod, a bolt, a firing button, a limiting nut, a key spring and a hook; One end of the fixed guide rod is fixed on the sliding block, and the other end is close to the tail end of the housing. The bolt is fixed at the tail end of the housing. The key spring, the limiting nut and the firing button are sequentially sleeved on the bolt, and the firing button protrudes from the tail end of the housing; One end of the hook is connected to the bolt, and the other end is used to limit the fixed guide rod. When the firing button is pressed and released, the hook can rotate. When the hook rotates to a position where it cooperates with the fixed guide rod, the displacement of the fixed guide rod in the length direction of the housing is limited. A brim is provided at one end of the fixed guide rod that cooperates with the hook. The hook can hook the end face of the brim away from the tail end of the housing. The hook is connected to the tail end of the housing through a rotating shaft. When the firing button is pressed and released, the hook can rotate around the rotating shaft.

2. The rock strength detector according to claim 1, wherein A positioning end head is provided at the end of the threaded column away from the adjusting nut. The positioning end head is a conical surface structure.

3. The rock strength detector according to claim 1, characterized in that, The position of the adjusting nut in the circumferential direction of the fixing ring is adjustable.

4. The rock strength detector according to claim 3, wherein, An annular groove is provided on the outer side surface of the fixing ring. A protrusion that cooperates with the annular groove is provided on the outer wall of the adjusting nut. The protrusion can slide along the circumferential direction of the fixing ring in the annular groove. The protrusion and the annular groove are fixed by an insertion rod or a threaded rod.

5. The rock strength detector according to any one of claims 1-4, characterized in that, A plurality of radial through holes are provided on the fixing ring. The radial through holes are used for detachable connection with the housing of the strength detector.

6. The method of using the rock strength detector according to any one of claims 1-5, characterized in that, It includes the following steps: S1. Push the impact shell into the interior of the housing until the fixed guide rod is hooked by the hook; S2. Select the measurement mode of the detector and reset the data to zero; S3. Place the end of the threaded column on the rock and adjust the height of each threaded column according to the pits on the surface of the rock at the placement position so that the ends of each threaded column are in contact with the rock surface; S4. Slowly press the firing button. The impact shell pops out and impacts the rock surface. After hearing the impact sound, slowly release the firing button; S5. The impact sound decibel value is collected by a sound level meter and transmitted to the data processing module, and the data processing module calculates the strength value of the rock based on the maximum decibel value within the time period of pressing and releasing the firing button.

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