Rock strength testing device for drilling engineering

Abstract

The invention relates to the technical field of rock testing, and discloses a rock strength testing device for drilling engineering, the rock strength testing device comprises a drill rod connecting piece, a main shell, a rebound mechanism, a reset mechanism, a controller and a rebound sensor, the drill rod connecting piece is used for being axially connected with a drill rod, and the main shell is arranged in the drill rod connecting piece along the radial direction; the springback mechanism comprises a guide rod, a springback hammer, a springback rod and a tension spring, and the tension spring is connected with the springback hammer and the springback rod; the reset mechanism comprises a moving seat, a telescopic driver, an electromagnet, a locking piece and a clamping rod, the telescopic driver is connected with the moving seat and the main shell, and the electromagnet is arranged on the moving seat to attract or release the elastic hammer; the locking piece is installed on the moving seat, the clamping rod is fixedly connected with the elastic striking rod, and the clamping rod is matched with the locking piece in a locking mode; the controller is electrically connected with the telescopic driver, the electromagnet, the locking piece and the springback sensor, the clamping rod is locked through the locking piece and the springback rod is recycled during drilling, the clamping rod is unlocked to eject the springback rod during testing, and the electromagnet is controlled to be powered off to release the springback hammer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock testing, in particular to a rock strength testing device for drilling engineering. BACKGROUND

[0002] In-situ rock strength testing is a key technology in tunnel engineering and geological exploration. Traditional rock strength testing methods include drilling sampling test, in-situ point load test and acoustic logging. Existing testing methods all rely on manual operation, and sampling leads to the destruction of the original state of the rock mass, so the test results cannot truly reflect the in-situ mechanical characteristics.

[0003] At present, a rebound hammer is commonly used in building engineering for structure quality detection, mainly for quickly testing the hardness or compressive strength of the surface layer of building materials such as concrete, masonry and stone. The working principle of the rebound hammer is: a spring drives a weight to hit a hitting rod with constant kinetic energy, causing the material surface layer to deform slightly and absorb part of the energy, and the other part of the energy is converted into the rebounding kinetic energy of the weight upward, when the rebounding kinetic energy is all converted into elastic potential energy, the weight reaches the maximum rebounding distance, at this time the rebound hammer converts the maximum rebounding distance of the weight into a rebound value output result.

[0004] However, the existing rebound hammer cannot be effectively connected with the drill rod system, and the rebounding reset of the rebound hammer relies on manual operation, which cannot meet the requirements of automatic testing of the rock strength of the hole wall during the horizontal drilling process. SUMMARY

[0005] The technical problem to be solved by the present application is that the existing rebound hammer cannot be effectively connected with the drill rod system, and the rebounding reset of the rebound hammer relies on manual operation, which cannot meet the requirements of automatic testing of the rock strength of the hole wall during the horizontal drilling process.

[0006] To solve the above technical problems, the present application provides a rock strength testing device for drilling engineering: The rock strength testing device for drilling engineering comprises a drill rod connecting piece, a main shell, a rebounding mechanism, a reset mechanism, a controller and a rebounding sensor arranged in the main shell, the drill rod connecting piece is used for axial connection with a drill rod, and the main shell is arranged in the drill rod connecting piece in a radial direction; One end of the main shell is provided with a through hole, the rebounding mechanism comprises a guide rod, a hitting hammer, a hitting rod and a tension spring, the guide rod is fixed in the main shell and arranged coaxially with the through hole, the hitting hammer and the hitting rod are both slidingly installed on the guide rod, the tension spring is connected between the hitting hammer and the hitting rod, and the hitting rod is movably matched with the through hole; The reset mechanism comprises a moving seat, a telescopic driver, an electromagnet, a locking piece and a clamping rod, the moving seat is movably arranged on the guide rod and away from the through hole, the telescopic driver connects the moving seat and the main shell, and the electromagnet is arranged on the moving seat to attract or release the rebound hammer; The locking piece is arranged on the moving seat, the clamping rod is fixedly connected with the rebound rod, and the clamping rod is locked with the locking piece. The controller is electrically connected with the telescopic driver, the electromagnet, the locking piece and the rebound sensor, the clamping rod is locked by the locking piece during drilling to recover the rebound rod, the clamping rod is unlocked to eject the rebound rod during testing, and the electromagnet is powered off to release the rebound hammer.

[0007] Further, the rebound sensor is a speed sensor, the speed sensor is fixedly connected with the rebound rod, the detection height of the speed sensor is equal to the height of the impact surface of the rebound rod, and the speed sensor is used for detecting the instantaneous rebound speed after the rebound hammer is impacted.

[0008] Further, the rock strength testing device further comprises a data storage, the data storage is electrically connected with the controller, the controller is used for receiving the instantaneous rebound speed signal detected by the speed sensor and processing the rebound data, and the data storage is used for receiving and storing the rebound data processed by the controller.

[0009] Further, the inside of the main shell is further provided with a fixed plate and a compression spring, the fixed plate is provided with an avoiding hole for the rebound rod and the clamping rod to pass through, the compression spring is arranged on one side of the fixed plate close to the through hole, and the compression spring is in top pressing cooperation with the rebound rod.

[0010] Further, the reset mechanism further comprises a flange plate, the flange plate is sleeved on the outside of the rebound rod and fixed with the rebound rod, the clamping rod is fixedly arranged on one side of the flange plate away from the through hole, and the compression spring is connected between the fixed plate and the flange plate.

[0011] Further, the main shell comprises a cylindrical barrel, a top cover and an annular bottom cover, the annular bottom cover is fixedly arranged on one end of the cylindrical barrel, the top cover is fixedly arranged on the other end of the cylindrical barrel, and the outer profiles of the top cover and the annular bottom cover are respectively matched with the outer wall profile of the drill rod connector.

[0012] Further, the telescopic driver is provided with at least two, at least two telescopic drivers are arranged on the outside of the reset mechanism, and the telescopic drivers are arranged at intervals with the flange plate; the telescopic drivers are respectively hingedly connected with the moving seat and the annular bottom cover, and the telescopic drivers are electric screw rods.

[0013] Further, waterproof rubber rings are arranged between the elastic striking rod and the flange plate and between the flange plate and the through hole.

[0014] Further, the locking member is rotationally installed on the moving seat, and the rotation axis of the locking member extends in parallel to the length direction of the guide rod; the locking member is provided with a clamping groove; and the clamping rod is inserted into the clamping groove.

[0015] Further, the end of the clamping rod close to the moving seat is provided with a clamping opening, and the clamping groove is provided with a flange; and the clamping opening is hung with the flange of the clamping groove.

[0016] Compared with the prior art, the rock strength testing device for drilling engineering has the beneficial effects that: the rock strength testing device for drilling engineering adopts the design form of a drill rod connecting piece, a main shell, a rebound mechanism, a reset mechanism, a controller and a rebound sensor; the drill rod connecting piece is used for axial connection with a drill rod; and the main shell extends in the radial direction and is arranged in the drill rod connecting piece. The device is integrated in the axial interior of the drill rod through the drill rod connecting piece, so that the measuring point can directly contact the hole wall rock; when drilling to the set depth, the drill rod does not need to be taken out, and the rock strength testing can be automatically performed; the device can more truly reflect the change of the formation structure, and avoids the problems of hysteresis, destructiveness and dispersed sampling point data of the traditional method.

[0017] The rebound mechanism is designed based on the rebound method principle, and includes a guide rod, an elastic striking hammer, an elastic striking rod and a tension spring; the elastic striking hammer impacts the elastic striking rod; the elastic striking rod impacts the rock surface; and the rebound sensor can accurately measure the rebound displacement or speed of the elastic striking hammer; the testing method is more mature and fast. The reset mechanism includes a moving seat, a telescopic drive, an electromagnet, a locking member and a clamping rod; the telescopic drive is used for driving the elastic striking rod to extend and retract; the locking member and the clamping rod are used for reliably locking the elastic striking rod in the drilling state to prevent damage caused by accidental extension; and the elastic striking rod can be flexibly unlocked during testing, so that the purpose of automatically completing the testing operation is achieved, manual operation or on-site sampling is not needed, the testing efficiency is improved, and the dependence on manual operation is avoided.

[0018] Before the test state, the locking member is controlled to unlock the clamping rod, the impact rod is ejected from the through hole and contacts the hole wall rock, the telescopic drive is retracted to drive the moving seat and the electromagnet to approach the impact hammer, the electromagnet is controlled to generate magnetic attraction to attract the impact hammer, then the telescopic drive is elongated to drive the moving seat, the electromagnet and the impact hammer to move away from the impact rod and stretch the tension spring, when the elongation reaches the set stroke, the electromagnet is powered off to release the impact hammer, the impact hammer impacts the impact rod to impact the hole wall rock, part of the energy is converted into the rebound kinetic energy of the impact hammer, the rebound sensor transmits the detected rebound kinetic energy to the controller, the controller receives and processes the rebound data. Repeat the above process to test the rebound at the same position multiple times, and finally control the locking member to lock the clamping rod to keep the impact rod in the recovery position.

[0019] In addition, the rebound mechanism, the reset mechanism, the controller and the rebound sensor are integrated in the main shell, which fully utilizes the internal space of the drill rod and is easy to integrate into the existing drill rod system with little interference to the drill rod operation. Moreover, the telescopic drive, the electromagnet and the locking member constitute a highly automated reset mechanism, which, in combination with the intelligent control of the controller and the rebound sensor, meets a series of requirements for the extension and recovery of the impact rod, the attraction and release control of the impact hammer, the detection of the rebound kinetic energy and the data transmission, thereby facilitating accurate and comprehensive acquisition of the strength profile of the formation rock. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a perspective view of a rock strength testing device for drilling engineering according to an embodiment of the present application; Fig. 2 is a sectional view of a rock strength testing device for drilling engineering according to an embodiment of the present application (when the impact rod is in the recovery state); Fig. 3 is an axonometric sectional view of a rock strength testing device for drilling engineering according to an embodiment of the present application (when the impact rod is in the recovery state); Fig. 4 is a sectional view of a rock strength testing device for drilling engineering according to an embodiment of the present application (when the impact hammer is in the pulled-up state); In the figure: 1, drill rod connecting piece; 2, main shell; 20, through hole; 21, fixed plate; 210, avoiding hole; 22, compression spring; 23, cylindrical barrel; 24, top cover; 25, annular bottom cover; 3, rebound mechanism; 30, guide rod; 31, impact hammer; 32, impact rod; 33, tension spring; 4, reset mechanism; 40, moving seat; 41, telescopic drive; 42, electromagnet; 43, locking member; 430, clamping groove; 44, clamping rod; 440, clamping port; 45, flange plate; 46, waterproof rubber ring; 5, controller; 6, rebound sensor; 7, data storage. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] like Figs. 1 to 4 As shown in the figure, an embodiment of the present invention provides a rock strength testing device for drilling projects, including a drill pipe connector 1, a main housing 2, and a rebound mechanism 3, a reset mechanism 4, a controller 5, and a rebound sensor 6 disposed within the main housing 2. The drill pipe connector 1 is used for axial connection with the drill pipe, and the main housing 2 extends radially within the drill pipe connector 1. One end of the main housing 2 has a through hole 20. The rebound mechanism 3 includes a guide rod 30, a striking hammer 31, a striking rod 32, and a tension spring 33. The guide rod 30 is fixed within the main housing 2 and coaxially arranged with the through hole 20. The striking hammer 31 and the striking rod 32 are both slidably mounted on the guide rod 30. The tension spring 33 is connected between the striking hammer 31 and the striking rod 32, and the striking rod 32 is movablely engaged with the through hole 20.

[0026] The reset mechanism 4 comprises a moving seat 40, a telescopic driver 41, an electromagnet 42, a locking piece 43 and a clamping rod 44, the moving seat 40 is movably arranged on the guide rod 30 and is arranged away from the through hole 20, the telescopic driver 41 is connected between the moving seat 40 and the main shell 2, the electromagnet 42 is arranged on the moving seat 40 and is used for attracting or releasing the impact hammer 31, the locking piece 43 is arranged on the moving seat 40, the clamping rod 44 is fixedly connected with the impact rod 32, the clamping rod 44 is locked with the locking piece 43, the controller 5 is electrically connected with the telescopic driver 41, the electromagnet 42, the locking piece 43 and the rebound sensor 6, the clamping rod 44 is locked by the locking piece 43 and the impact rod 32 is recovered during drilling, the impact rod 32 is pushed out when the clamping rod 44 is unlocked during testing, and the electromagnet 42 is controlled to be powered off to release the impact hammer 31.

[0027] The rock strength testing device for drilling engineering adopts the design form of the drill rod connecting piece 1, the main shell 2, the rebound mechanism 3, the reset mechanism 4, the controller 5 and the rebound sensor 6, the drill rod connecting piece 1 is used for axial connection with a drill rod, and the main shell 2 extends in the radial direction and is arranged in the drill rod connecting piece 1. The device is integrated in the axial interior of the drill rod through the drill rod connecting piece 1, so that the measuring point can directly contact the hole wall rock, the rock strength test can be automatically performed without taking out the drill rod when drilling to the set depth, the change of the formation structure can be more truly reflected, and the problems of hysteresis, destructiveness and dispersed sampling point data of the traditional method are avoided.

[0028] The rebound mechanism 3 is designed based on the rebound method principle, and comprises a guide rod 30, an impact hammer 31, an impact rod 32 and a tension spring 33, the impact hammer 31 impacts the impact rod 32, the impact rod 32 impacts the rock surface, the rebound sensor 6 can accurately measure the rebound displacement or speed of the impact hammer 31, and the testing method is more mature and rapid. The reset mechanism 4 comprises a moving seat 40, a telescopic driver 41, an electromagnet 42, a locking piece 43 and a clamping rod 44, the telescopic driver 41 is used for driving the impact rod 32 to extend and retract, the impact rod 32 is reliably locked by the locking piece 43 and the clamping rod 44 in the drilling state, so that the damage caused by accidental extension is prevented, the impact rod 32 can be flexibly unlocked during testing, the purpose of automatically completing the testing operation is achieved, manual operation or on-site sampling is not needed, the testing efficiency is improved, and the dependence on manual operation is avoided.

[0029] Before the test state, the locking piece 43 is controlled to unlock the clamping rod 44, the impact rod 32 is ejected from the through hole 20 and contacts the hole wall rock, the movable seat 40 and the electromagnet 42 are driven to move close to the impact hammer 31 by the retraction action of the telescopic driver 41, the electromagnet 42 is controlled to generate a magnetic attraction force to attract the impact hammer 31, then the movable seat 40, the electromagnet 42 and the impact hammer 31 are driven to move away from the impact rod 32 by the extension action of the telescopic driver 41 and stretch the tension spring 33, when the extension reaches the set stroke, the electromagnet 42 is powered off to release the impact hammer 31, the impact hammer 31 impacts the impact rod 32 to impact the hole wall rock, part of the energy is converted into the rebound kinetic energy of the impact hammer 31, the rebound sensor 6 transmits the detected rebound kinetic energy to the controller 5, the rebound data is obtained by the controller 5 receiving and processing the rebound kinetic energy, the above process is repeated to perform multiple rebound tests on the same position, and finally the locking piece 43 is controlled to lock the clamping rod 44 again to keep the impact rod 32 in the recovery position.

[0030] In addition, the rebound mechanism 3, the reset mechanism 4, the controller 5 and the rebound sensor 6 are integrated in the main shell 2, the internal space of the drill rod is fully utilized, and the rebound mechanism 3, the reset mechanism 4, the controller 5 and the rebound sensor 6 are easily integrated into the existing drill rod system, and the interference with the drill rod operation is small. Moreover, the telescopic driver 41, the electromagnet 42 and the locking piece 43 constitute a highly automated reset mechanism 4, and the controller 5 and the rebound sensor 6 are intelligently controlled, thereby meeting a series of requirements of the extension and recovery actions of the impact rod 32, the attraction and release control of the impact hammer 31, the detection and data transmission of the rebound kinetic energy, and facilitating accurate and comprehensive acquisition of the strength profile of the formation rock.

[0031] In the embodiment, the rebound sensor 6 is a speed sensor, the speed sensor is fixedly connected with the impact rod 32, the detection height of the speed sensor is equal to the impact surface height of the impact rod 32, and the speed sensor is used to detect the instantaneous rebound speed after the impact hammer 31 is impacted. Moreover, the rock strength testing device further comprises a data storage 7, the data storage 7 is electrically connected with the controller 5, the controller 5 is used to receive the instantaneous rebound speed signal detected by the speed sensor and process the instantaneous rebound speed signal into rebound data, and the data storage 7 is used to receive and store the rebound data processed by the controller 5.

[0032] As a further preferred scheme, the inside of the main shell 2 is further provided with a fixed plate 21 and a compression spring 22, the fixed plate 21 is provided with an avoiding hole 210 for the impact rod 32 and the clamping rod 44 to pass through, the compression spring 22 is arranged on one side of the fixed plate 21 close to the through hole 20, and the compression spring 22 is in abutting pressure cooperation with the impact rod 32. The outward abutting pressure action of the compression spring 22 on the impact rod 32 enables the impact rod 32 to be automatically ejected from the through hole 20 when the locking piece 43 unlocks the clamping rod 44, thereby ensuring that the impact rod 32 can effectively contact the hole wall rock.

[0033] The reset mechanism 4 further comprises a flange 45 sleeved on the outside of the ejector rod 32 and fixed with the ejector rod 32, the clamping rod 44 is fixed on the side of the flange 45 away from the through hole 20, and the compression spring 22 is connected between the fixed plate 21 and the flange 45. The flange 45 provides a mounting base for the compression spring 22 and the clamping rod 44, ensuring the automatic ejection and reliable locking of the ejector rod 32. The waterproof rubber ring 46 is arranged between the ejector rod 32 and the flange 45 and between the flange 45 and the through hole 20.

[0034] In the embodiment, the main shell 2 comprises a cylindrical barrel 23, a top cover 24 and an annular bottom cover 25. The annular bottom cover 25 is fixedly installed at one end of the cylindrical barrel 23, and the top cover 24 is fixedly installed at the other end of the cylindrical barrel 23. The outer profiles of the top cover 24 and the annular bottom cover 25 are matched with the outer wall profile of the drill rod connector 1. The top cover 24 and the annular bottom cover 25 of the main shell 2 have high consistency with the outer wall profile of the drill rod connector 1, preventing the main shell 2 from protruding relative to the drill rod connector 1 and affecting the smooth drilling work.

[0035] The telescopic drives 41 are arranged on the outside of the reset mechanism 4 and are spaced apart from the flange 45. The telescopic drives 41 are hingedly connected with the moving seat 40 and the annular bottom cover 25, and are electric screw rods. The telescopic drives 41 can drive the moving seat 40 to move up and down in the main shell 2. When moving downward, the clamping rod 44 can form a locking relationship with the locking piece 43, and the electromagnetic iron 42 can attract the ejector hammer 31. When moving upward, the ejector rod 32 can be moved to the recovery position, and the ejector hammer 31 can be driven to move to the set firing position.

[0036] The locking piece 43 is rotationally installed on the moving seat 40, and the rotation axis of the locking piece 43 extends in parallel with the length direction of the guide rod 30. The locking piece 43 is provided with a clamping groove 430, and the clamping rod 44 is insertedly matched with the clamping groove 430. The end of the clamping rod 44 close to the moving seat 40 is provided with a clamping opening 440, and the clamping groove 430 is provided with a flange. The clamping opening 440 is hungly matched with the flange of the clamping groove 430. The locking piece 43 is a rotary disc, and the controller 5 controls the locking piece 43 to rotate to a set angle, so that the flange of the clamping groove 430 can hang and lock the clamping opening 440 of the clamping rod 44. Correspondingly, the locking piece 43 is controlled to rotate in the opposite direction, so that the clamping rod 44 can be unlocked.

[0037] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make some improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A rock strength testing device for use in drilling engineering, characterised in that, The rock strength testing device comprises a drill rod connector, a main shell, a rebound mechanism, a reset mechanism, a controller and a rebound sensor, the drill rod connector is used for axial connection with a drill rod, and the main shell is arranged in the drill rod connector in a radial direction; One end of the main shell is provided with a through hole, the rebound mechanism comprises a guide rod, a rebound hammer, a rebound rod and a tension spring, the guide rod is fixed in the main shell and arranged coaxially with the through hole, the rebound hammer and the rebound rod are both slidingly installed on the guide rod, the tension spring is connected between the rebound hammer and the rebound rod, and the rebound rod is movably matched with the through hole; the reset mechanism comprises a moving seat, a telescopic driver, an electromagnet, a locking piece and a clamping rod, the moving seat is movably installed on the guide rod and arranged away from the through hole, the telescopic driver connects the moving seat and the main shell, and the electromagnet is arranged on the moving seat and used for attracting or releasing the rebound hammer; The locking piece is installed on the moving seat, the clamping rod is fixedly connected with the rebound rod, and the clamping rod is locked with the locking piece; The controller is electrically connected with the telescopic driver, the electromagnet, the locking piece and the rebound sensor, the clamping rod is locked by the locking piece and the rebound rod is recovered during drilling, the clamping rod is unlocked and the rebound rod is ejected during testing, and the electromagnet is powered off to release the rebound hammer.

2. The rock strength testing device for use in drilling engineering according to claim 1, characterized in that, The rebound sensor is a speed sensor, the speed sensor is fixedly connected with the rebound rod, the detection height of the speed sensor is equal to the height of the impact surface of the rebound rod, and the speed sensor is used for detecting the instantaneous rebound speed of the rebound hammer after impact.

3. The rock strength testing device for use in drilling engineering according to claim 2, characterized in that, The rock strength testing device further comprises a data storage, the data storage is electrically connected with the controller, the controller is used for receiving the instantaneous rebound speed signal detected by the speed sensor and processing the rebound data, and the data storage is used for receiving and storing the rebound data processed by the controller.

4. The rock strength testing device for use in drilling engineering according to claim 1, characterized in that, The inside of the main shell is further provided with a fixed plate and a compression spring, the fixed plate is provided with an avoiding hole for the rebound rod and the clamping rod to pass through, the compression spring is arranged on one side of the fixed plate close to the through hole, and the compression spring is in abutting engagement with the rebound rod.

5. The rock strength testing device for use in drilling engineering according to claim 4, characterized in that, The reset mechanism further comprises a flange, the flange is sleeved on the outside of the rebound rod and fixed with the rebound rod, the clamping rod is fixedly arranged on one side of the flange away from the through hole, and the compression spring is connected between the fixed plate and the flange.

6. The rock strength testing device for use in drilling engineering according to claim 5, characterized in that, The main shell comprises a cylindrical barrel, a top cover and an annular bottom cover, the annular bottom cover is fixedly installed on one end of the cylindrical barrel, the top cover is fixedly installed on the other end of the cylindrical barrel, and the outer profiles of the top cover and the annular bottom cover are respectively matched with the outer wall profile of the drill rod connector.

7. A rock strength testing device for use in drilling engineering according to claim 6, characterised in that, The telescopic driver is provided with at least two, the at least two telescopic drivers are arranged on the outside of the reset mechanism, and the telescopic drivers are arranged at intervals with the flange; the telescopic drivers are respectively hingedly connected with the moving seat and the annular bottom cover, and the telescopic driver is an electric screw rod.

8. Apparatus for testing the strength of rock for engineering drilling purposes according to any one of claims 5 to 7 characterised in that, Waterproof rubber rings are arranged between the elastic striking rod and the flange plate and between the flange plate and the through hole.

9. The rock strength testing device for use in drilling engineering according to claim 1, characterized in that, The locking member is rotationally installed on the moving seat, and the rotation axis of the locking member extends in parallel to the length direction of the guide rod.

10. A rock strength testing device for use in drilling engineering according to claim 9, characterised in that, The end of the clamping rod close to the moving seat is provided with a clamping opening, and the clamping slot is provided with a flange, and the clamping opening is hung in cooperation with the flange of the clamping slot.

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