CN107290192B - A device and working method for preparing through-cracks of rock samples - Google Patents

Abstract

The invention discloses a device and a working method for preparing a rock sample through crack, wherein the device comprises a base, a support structure, a workbench, a drilling device, a cutting device, a sample fixing device, a dust removing device and a power source, wherein the support structure is fixed on the base, the support structure comprises upright posts, cross beams, connecting beams, supporting rods, sliding rails, a front glass plate, a side glass plate, a rear glass plate and a glass cover plate, the four upright posts are vertically fixed on the base, the two cross beams and the two connecting beams are fixedly connected to form a rectangular frame, the rectangular frame is fixed at the upper ends of the upright posts, the supporting rods are horizontally fixed at the middle parts of the two upright posts, and the two supporting rods are symmetrically arranged and are positioned on the same horizontal plane. The invention can effectively improve the precision and efficiency of the permeable cracks of the prepared rock sample, thereby being convenient for the subsequent experiments on the rock sample, and in addition, the invention has the dry dust removal function in the manufacturing process, and can not change the original mechanical properties of the rock, but also can not influence the surrounding environment and the human health.

Description

A device and working method for preparing through-cracks of rock samples

technical field

The invention relates to a device and a working method for preparing a rock sample, in particular to a device and a working method for preparing a rock sample through a crack.

Background technique

When studying the mechanical properties of rock, it is often necessary to make various rock specimens, and the surrounding rock mass of underground engineering mostly contains weak surfaces such as cracks, joints, faults, and weak interlayers, which have a negative impact on the stability of underground engineering surrounding rock, so , the study of the mechanical properties of fractured rock specimens is of great significance to the mechanical properties of fractured rock mass and the stability of underground engineering. At present, there are mainly defects in the following aspects in the preparation method of the fractured rock test piece: the one is that a large amount of dust is produced in the drilling and cutting process of the rock fracture, which is not only harmful to the health of the operating personnel, but also pollutes the indoor environment. If water spraying is used to reduce dust, It will change the original mechanical properties of the rock; second, it is difficult to accurately control the spatial position, size, and concentricity of both ends of the crack, which cannot meet the pre-designed crack requirements; third, there are many ways to make rock cracks. It is a manual or semi-automatic operation (such as a mold combined with a diamond wire manual saw), therefore, the production efficiency of the crack is low. It can be seen that the existing techniques and methods for producing through-cracks in rock specimens need to be further improved and enhanced.

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a device and a working method for preparing rock sample through-cracks, which can effectively improve the accuracy and efficiency of preparing rock sample through-cracks, thereby facilitating subsequent analysis. In the experiment of rock samples, in addition, it has the function of dry dust removal during the production process, which will neither change the original mechanical properties of the rock, nor affect the surrounding environment and human health.

In order to achieve the above object, the technical solution adopted by the present invention is: a device for preparing a rock sample through a crack, including a base, a support structure, a work platform, a drilling device, a cutting device, and a sample fixing device , dust removal device and power source, the bracket structure is fixed on the base, the bracket mechanism includes columns, beams, connecting beams, support rods, slide rails, front glass panels, side glass panels, rear glass panels and glass cover panels, four The column is vertically fixed on the base, and two beams and two connecting beams are fixedly connected to form a rectangular frame. The rectangular frame is fixed on the upper end of the column. , the two brackets are arranged symmetrically and on the same horizontal plane, the glass cover plate is fixed on the two brackets, the front glass plate, side glass plate and rear glass plate are respectively fixed on the side of the column by bolts, the glass cover plate, front glass Plate, side glass plate, rear glass plate and the upper surface of the base enclose an accommodating cavity, a working window is set on the glass cover plate, two parallel sliding rails are fixed on the rectangular frame, and the working platform is slidably arranged on On a slide rail, the drilling device and the cutting device are fixed at the lower end of the working platform;

The drilling device includes an outer shell, an inner shell, a fixed sleeve, a first motor, a speed changer, a limit ring, a ball screw, a drive nut, a second motor and a drill bit, the fixed sleeve and the outer shell are fixed on the lower end of the work platform and the fixed sleeve Located in the outer shell, the inner shell is between the fixed sleeve and the outer shell, the first motor is arranged in the fixed sleeve and fixedly connected with the fixed sleeve, the transmission is connected to the lower end of the first motor, and the output end of the transmission is coaxially connected with the ball screw , the limit ring is fixed inside the fixed sleeve, the limit ring is provided with a central through hole, the diameter of the central through hole is larger than the ball screw, the ball screw passes through the central through hole, and the side wall of the fixed sleeve is symmetrically provided with two long The drive nut is set on the ball screw and is threadedly connected with the ball screw. Two push rods are fixed on the drive nut, and the two push rods pass through the two long holes and are fixedly connected with the inner shell respectively. The second motor is fixed in the inner shell, and the drill bit is arranged at the lower end of the inner shell and passes through the inner shell to be coaxially connected with the output shaft of the second motor;

The cutting device includes a cylinder, a third motor, a driving wheel, a transmission gear, a drive rod, a transmission rod, a piston and a cutting head, the top of the cylinder is fixedly connected to the lower end of the work platform, and the third motor is fixed on the inner wall of the cylinder. The driving wheel is fixed on the output shaft of the third motor, and the transmission gear is arranged on the inner wall of the cylinder on the side of the third motor, and the transmission gear meshes with the driving wheel; the piston is slidably arranged in the cylinder, and the bottom of the cylinder is provided with a round hole , the cutting head is arranged under the cylinder and one end thereof is fixedly connected to the piston through a round hole; one end of the driving rod is fixedly connected to the transmission gear, the other end of the driving rod is hinged to one end of the transmission rod, and the other end of the transmission rod is connected to the cutting One end of the head is hinged;

The power source is electrically connected to the first motor, the second motor and the third motor through connecting wires, and the sample fixing device is arranged in the containing chamber, and the sample fixing device consists of two supports, two clamps and two stoppers. The two supports are arranged oppositely in the accommodation chamber, the two clamps are respectively fixed on the upper ends of the two supports, and the two baffles are respectively arranged on the sides of the two supports; the upper ends of the two baffles are respectively set There is a plumb rod; the dust removal device communicates with the containing cavity through a pipeline.

Further, it also includes a plurality of diagonal supports, and the plurality of diagonal supports are respectively fixedly connected between the column and the beam and between the column and the connecting beam.

Further, it also includes a second motor start and stop button, a second motor speed adjustment button and a first motor forward and reverse button, and the second motor start and stop button, the second motor speed adjustment button and the first motor forward and reverse button are all arranged on the On the shell surface, the start-stop button of the second motor and the speed adjustment button of the second motor are connected to the second motor, and the forward and reverse button of the first motor is connected to the first motor.

Further, it also includes a third motor start-stop button and a third motor speed adjustment button, the third motor start-stop button and the third motor speed adjustment button are all arranged on the cylinder surface, the third motor start-stop button and the third motor speed adjustment button The buttons are respectively connected with the third motors.

Further, it also includes a handle and a positioning bolt, the handle is fixed on the upper end of the working platform, and the positioning bolt is arranged on the side of the working platform.

A working method for a device for preparing rock samples through cracks, the specific steps are:

A. Making rock samples and positioning line marks: After selecting the nature of the rock mass, make the rock mass into a cylindrical rock sample, and then mark the radial positioning line passing through the center of the end face and the side of the cylinder on the end face of the rock sample and Axial location line in the same plane as the radial location line;

B. Mark the position of the prefabricated through-crack: according to the position of the through-crack of the rock sample required for the experiment, mark the position of the first positioning hole and the second positioning hole on the axial positioning line of the rock sample, and mark A prefabricated crack path between the first positioning hole and the second positioning hole;

C. Fix the position of the rock sample and the positioning of the working platform: open the glass cover, place the rock sample in the sample fixing device, rotate the rock sample so that the radial positioning line coincides with the plumb rod, and then pass The clamp locks and fixes the rock sample, and after the glass cover is covered, the drill bit of the drilling device is aligned with the first positioning hole marked on the rock sample by moving the work platform through the handle;

D. Drilling the first positioning hole and the second positioning hole for the rock sample: start the power source and the dust removal device, and then use the forward and reverse button of the first motor to start the first motor to rotate, and drive the inner shell down through the drive nut until the drill bit When the vertical distance from the first positioning hole is less than 3mm, the second motor drives the drill bit to rotate through the second motor start-stop button and the second motor speed adjustment button, and then the drill bit starts to drill the first positioning hole. After the drilling of the positioning hole is completed, the drill bit is controlled to stop rotating through the start-stop button of the second motor, and the inner shell is raised through the forward and reverse button of the first motor at the same time; then the drilling process of the first positioning hole is repeated to complete the drilling of the second positioning hole drill;

E. Make transparent cracks: Loosen the positioning bolts, move the working platform by the handle so that the cutting head of the cutting device is aligned with the first positioning hole, and then control the cutting head to start through the third motor start-stop button and the third motor speed adjustment button. For cutting, slowly move the working platform along the path of the prefabricated fracture to the direction of the second positioning hole until the penetration fracture is completed, and then take out the rock sample.

Compared with the prior art, the present invention adopts a base, a support structure, a work platform, a drilling device, a cutting device, a sample fixing device, a dust removal device and a power source in combination, and has the following advantages:

(1) The accommodation chamber composed of the front glass plate, side glass plate, rear glass plate and glass cover plate is used to prevent dust, and then the dust is removed by the dust removal device, which eliminates the dust generated during the process of making the rock sample through the crack. The influence of personnel and indoor environment. In addition, compared with spraying water to reduce dust, this method has the advantage of not changing the original mechanical properties of the rock;

(2) By marking the radial positioning line, the axial positioning line, the first positioning hole, the second positioning hole and the plumb rod calibration on the rock sample, and adding the rock sample fixing device, it is ensured that the crack can be obtained through the crack. There is no displacement or deviation during the process, which makes the rock sample penetration fracture more accurate and meets the experimental design requirements;

(3) Compared with the conventional manual or semi-automatic production of penetrating fractures of rock samples, the device adopts cutting devices and drilling devices, which greatly improves the production efficiency of penetrating fractures of rock specimens and reduces the labor intensity of staff ;

(4) There is no need to make a mold with a fixed size in advance, and the position and size of the crack can be adjusted arbitrarily, which saves the cost of the experiment;

(5) The overall structure of the present invention is reasonable, and the operation is simple and practical when used.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention;

Fig. 2 is the front view of the present invention;

Fig. 3 is the structural sectional view of drilling device among the present invention;

Fig. 4 is the structural sectional view of cutting device among the present invention;

Fig. 5 is the structural representation of sample fixing device in the present invention;

Fig. 6 is a schematic diagram of the location of through-cracks on a rock sample in the present invention.

In the figure: 1. Base; 2. Bracket structure; 21. Upright column; 22. Beam; 23. Connecting beam; 24. Diagonal support; Side glass plate; 29, rear glass plate; 30, glass cover plate; 30-1, work window; 3, work platform; 31, handle; 32, positioning bolt; 4, drilling device; 41, shell; 42, Inner shell; 43, fixed sleeve; 44, first motor; 45, transmission; 46, limit ring; 47, ball screw; 48, transmission nut; 49, second motor; 50, drill bit; 4-1, the first Two motor start-stop buttons; 4-2, second motor speed adjustment button; 4-3, first motor forward and reverse button; 5, cutting device; 51, cylinder barrel; 52, third motor; 53, driving wheel; 54. Transmission gear; 55. Transmission rod; 56. Piston; 57. Cutting head; 58. The third motor start-stop button; 59. The third motor speed adjustment button; 6. Sample fixing device; 61. Support; 62 , clamp; 63, baffle; 64, plumb rod; 7, dust removal device; 8, power source; 9, connection line; 10, bolt; 11, rock sample; 11-1, radial positioning line; 11 -2. Axial positioning line; 11-3. First positioning hole; 11-4. Second positioning hole; 11-5. Prefabricated crack path.

Detailed ways

The present invention will be further described below.

As shown in Figures 1 to 6, a device for preparing rock samples through cracks, including a base 1, a support structure 2, a work platform 3, a drilling device 4, a cutting device 5, and a sample fixing device Device 6, dust removal device 7 and power source 8, bracket structure 2 is fixed on the base 1, bracket mechanism 2 includes column 21, crossbeam 22, connecting beam 23, support bar 25, slide rail 26, front glass plate 27, side Glass plate 28, rear glass plate 29 and glass cover plate 30, four columns 21 are vertically fixed on the base 1, two beams 22 and two connecting beams 23 are fixedly connected to form a rectangular frame, and the rectangular frame is fixed on At the upper end of the column 21, the support rod 25 is horizontally fixed in the middle of the two support rods 21. There are two support rods 25. The two support rods 25 are arranged symmetrically and on the same horizontal plane. The glass cover plate 30 is fixed on the two support rods 25. Front glass plate 27, side glass plate 28 and rear glass plate 29 are respectively fixed on column 21 side by bolt 10, on described glass cover plate 30, front glass plate 27, side glass plate 28, rear glass plate 29 and base 1 The surface is surrounded by an accommodating cavity, and a working window 30-1 is set on the glass cover plate 30. Two parallel sliding rails 26 are fixed on the rectangular frame, and the working stage 3 is slidably arranged on the two sliding rails 26. The hole device 4 and the cutting device 5 are fixed on the lower end of the working platform 3;

Described drilling device 4 comprises shell 41, inner shell 42, fixed cover 43, first motor 44, speed changer 45, limit ring 46, ball screw 47, drive nut 48, second motor 49 and drill bit 50, fixed cover 43 and the outer shell 41 are fixed on the lower end of the work platform 3 and the fixed sleeve 43 is in the outer shell 41, the inner shell 42 is between the fixed sleeve 43 and the outer shell 41, and the first motor 44 is arranged in the fixed sleeve 43 and connected with the fixed sleeve 43 Fixedly connected, the speed changer 45 is connected to the lower end of the first motor 44, the output end of the speed changer 45 is coaxially connected with the ball screw 47, the limit ring 46 is fixed inside the fixed sleeve 43, and the limit ring 46 is provided with a central through hole, The diameter of the center through hole is larger than the ball screw 47, and the ball screw 47 passes through the center through hole, and the side wall of the fixed sleeve 43 is symmetrically provided with two long holes, and the drive nut 48 is sleeved on the ball screw 47 and connected with the ball screw. 47 threaded connection, two push rods are fixed on the transmission nut 48, and the two push rods pass through two elongated holes and are fixedly connected with the inner shell 42 respectively, the second motor 49 is fixed in the inner shell 42, and the drill bit 50 Set at the lower end of the inner shell 42 and pass through the inner shell 42 to be coaxially connected with the output shaft of the second motor 49;

The cutting device 5 includes a cylinder 51, a third motor 52, a driving wheel 53, a transmission gear 54, a drive rod, a transmission rod 55, a piston 56 and a cutting head 57, and the top of the cylinder 51 is fixedly connected to the lower end of the work platform 3 , the third motor 52 is fixed on the inner wall of the cylinder 51, the driving wheel 53 is fixed on the output shaft of the third motor 52, the transmission gear 54 is arranged on the inner wall of the cylinder 51 on one side of the third motor 52, the transmission gear 54 and the driving wheel 53 engagement; the piston 56 is slidably arranged in the cylinder 51, the bottom end of the cylinder 51 is provided with a circular hole, the cutting head 57 is arranged below the cylinder 51 and one end thereof is fixedly connected with the piston 56 through the circular hole; one end of the driving rod Fixedly connected with the transmission gear 54, the other end of the driving rod is hinged with one end of the transmission rod 55, and the other end of the transmission rod 55 is hinged with one end of the cutting head 57;

The power source 8 is electrically connected to the first motor 44, the second motor 49 and the third motor 52 through the connecting wire 9, the sample fixing device 6 is arranged in the accommodating cavity, and the sample fixing device 6 consists of two supports 61, Two hoops 62 and two baffles 63 are composed, two supports 61 are arranged in the accommodation cavity oppositely, two hoops 62 are respectively fixed on the upper ends of the two supports 61, and two baffles 63 are respectively arranged on two the side of the bearing 61; the upper ends of the two baffle plates 63 are provided with a plumb rod 64; the baffle plate 63 is set to prevent the axial displacement of the rock sample 11 during the slit process, and the plumb rod 64 is set in addition to Ensure that the set radial positioning line is vertical, and the dust removal device 7 communicates with the accommodating cavity through a pipeline.

As an improvement of the present invention, a plurality of diagonal supports 24 are also included, and the plurality of diagonal supports 24 are respectively fixedly connected between the column 21 and the beam 22 and between the column 21 and the connecting beam 23 . Adding the inclined support 24 can strengthen the load-bearing structure composed of the column 21, the cross beam 22 and the connecting beam 23, thereby making the load-bearing structure more stable.

Further, also include the second motor start-stop button 4-1, the second motor speed adjustment button 4-2 and the first motor forward and reverse button 4-3, the second motor start-stop button 4-1, the second motor speed adjustment button The button 4-2 and the first motor forward and reverse button 4-3 are all arranged on the surface of the shell 41, the second motor start-stop button 4-1 and the second motor speed adjustment button 4-2 are connected with the second motor 49, the first The motor forward and reverse button 4-3 is connected with the first motor 44. The rotation speed and lifting position of the drilling device 4 can be controlled conveniently by arranging the above-mentioned buttons, so as to improve the drilling accuracy of the positioning holes.

Further, it also includes a third motor start-stop button 58 and a third motor speed adjustment button 59, the third motor start-stop button 58 and the third motor speed adjustment button 59 are all arranged on the surface of the cylinder barrel 51, and the third motor start-stop button 58 and the third motor speed adjustment button 59 are connected with the third motor 52 respectively. The cutting speed of the cutting device 5 can be conveniently controlled by setting the above-mentioned button, and the precision of cutting through the fissure can be improved.

Further, it also includes a handle 31 and a positioning bolt 32 , the handle 31 is fixed on the upper end of the working platform 3 , and the positioning bolt 32 is arranged on the side of the working platform 3 . The handle 31 is provided to facilitate the movement of the work platform 3 by the staff, and the positioning bolt 32 is provided to facilitate the positioning of the work platform 3 on the slide rail 26, thereby improving the drilling stability when drilling.

A working method for a device for preparing rock samples through cracks, the specific steps are:

A. Make the rock sample 11 and mark the positioning line: after selecting the nature of the rock body, make the rock body into a cylindrical rock sample, and then mark the radial location passing through the center of the end face on the end face and the side of the cylinder of the rock sample 11 Line 11-1 and axial positioning line 11-2 in the same plane as radial positioning line 11-1;

B. Mark the position of the prefabricated penetrating crack: according to the position of the penetrating crack of the rock sample required for the experiment, mark the first positioning hole 11-3 and the second positioning hole 11-3 on the axial positioning line 11-2 of the rock sample 11 The position of the hole 11-4, and mark the prefabricated crack path 11-5 between the first positioning hole 11-3 and the second positioning hole 11-4; this can ensure that the through crack passes through the central axis of the rock sample 11;

C. The position of the rock sample 11 is fixed and the positioning of the working platform 3: open the glass cover plate 30, place the rock sample 11 in the sample fixing device 6, rotate the rock sample 11 to make the radial positioning line 11- 1 coincides with the plumb rod 64, and then the rock sample 11 is locked and fixed by the clamp 62. After the glass cover 30 is covered, the work platform 3 is moved by the handle 31 so that the drill bit 50 of the drilling device 4 and the rock sample 11 Align the marked first positioning holes 11-3;

D. Drill the first positioning hole 11-3 and the second positioning hole 11-4 on the rock sample 11: start the power source 8 and the dust removal device 7, and then make the first motor rotate through the forward and reverse button 4-3 of the first motor 44 starts to rotate, and the drive nut 48 drives the inner casing 42 to descend until the vertical distance between the drill bit 50 and the first positioning hole 11-3 is less than 3mm, and the second motor start-stop button 4-1 and the second motor speed adjustment button 4- 2. Make the second motor 49 drive the drill bit 50 to rotate, and then the drill bit 50 starts to drill the first positioning hole 11-3. After the drilling of the first positioning hole 11-3 is completed, press the second motor start-stop button 4- 1 Control the drill bit 50 to stop rotating, and at the same time, the inner shell 42 is raised through the forward and reverse button 4-3 of the first motor; then repeat the drilling process of the first 4 positioning holes 11-3 to complete the drilling of the second positioning hole 11-4 Pick;

E. Make a transparent crack: Loosen the positioning bolt 32, move the work platform 3 through the handle 31 so that the cutting head 57 of the cutting device 5 is aligned with the first positioning hole 11-3, and then use the third motor start-stop button 58 and the first The three-motor speed adjustment button 59 controls the cutting head 57 to start cutting, and slowly moves the working platform 3 along the prefabricated crack path 11-5 to the second positioning hole 11-4 until the transparent crack is made, and the rock sample 11 is taken out .

Claims (5)

1. The working method for preparing the rock sample penetrating slit device is characterized in that the adopted device comprises a base (1), a support structure (2), a working carrying table (3), a drilling device (4), a cutting device (5), a sample fixing device (6), a dust removing device (7) and a power source (8), wherein the support structure (2) is fixed on the base (1), the support structure (2) comprises upright posts (21), cross beams (22), connecting beams (23), supporting rods (25), sliding rails (26), a front glass plate (27), a side glass plate (28), a rear glass plate (29) and a glass cover plate (30), the four upright posts (21) are vertically fixed on the base (1), the two cross beams (22) and the two connecting beams (23) are fixedly connected to form a rectangular frame, the rectangular frame is fixed at the upper ends of the upright posts (21), the supporting rods (25) are horizontally fixed in the middle of the two upright posts (21), the two supporting rods (25) are symmetrically arranged and are positioned on the same horizontal plane, the glass cover plate (30) is fixed on the two supporting rods (25), the front glass plate (27) and the glass cover plate (30) are fixed on the side surfaces of the glass cover plate (10) through bolts (30), and the front glass plate (27) and the glass cover plate (30) are fixed on the side surfaces of the glass cover plate (10 respectively The upper surfaces of the front glass plate (27), the side glass plates (28), the rear glass plate (29) and the base (1) are enclosed to form a containing cavity, a working window (30-1) is formed in the glass cover plate (30), two parallel sliding rails (26) are fixed on the rectangular frame, the working carrier (3) is slidingly arranged on the two sliding rails (26), and the drilling device (4) and the cutting device (5) are fixed at the lower end of the working carrier (3);

the drilling device (4) comprises an outer shell (41), an inner shell (42), a fixing sleeve (43), a first motor (44), a speed changer (45), a limiting ring (46), a ball screw (47), a transmission nut (48), a second motor (49) and a drill bit (50), wherein the fixing sleeve (43) and the outer shell (41) are fixed at the lower end of a working carrier (3), the fixing sleeve (43) is positioned in the outer shell (41), the inner shell (42) is positioned between the fixing sleeve (43) and the outer shell (41), the inner shell (42) can move relative to the fixing sleeve (43) and the outer shell (41), the first motor (44) is arranged in the fixing sleeve (43) and fixedly connected with the fixing sleeve (43), the speed changer (45) is connected at the lower end of the first motor (44), the output end of the speed changer (45) is coaxially connected with the ball screw (47), the limiting ring (46) is fixed inside the fixing sleeve (43), the diameter of the central through hole is larger than that of the ball screw (47), the ball screw (47) penetrates through the central through hole, the fixing sleeve (47) and is symmetrically provided with two strip-shaped side walls (48) and is connected with the ball screw (47) through the transmission nut (48), the two push rods respectively penetrate through the two strip-shaped holes to be fixedly connected with the inner shell (42), the second motor (49) is fixed in the inner shell (42), and the drill bit (50) is arranged at the lower end of the inner shell (42) and penetrates through the inner shell (42) to be coaxially connected with an output shaft of the second motor (49);

the cutting device (5) comprises a cylinder barrel (51), a third motor (52), a driving wheel (53), a transmission gear (54), a driving rod, a transmission rod (55), a piston (56) and a cutting head (57), wherein the top end of the cylinder barrel (51) is fixedly connected with the lower end of the workbench (3), the third motor (52) is fixed on the inner wall of the cylinder barrel (51), the driving wheel (53) is fixed on the output shaft of the third motor (52), the transmission gear (54) is arranged on the inner wall of the cylinder barrel (51) at one side of the third motor (52), and the transmission gear (54) is meshed with the driving wheel (53); the piston (56) is arranged in the cylinder barrel (51) in a sliding manner, a round hole is formed in the bottom end of the cylinder barrel (51), the cutting head (57) is arranged below the cylinder barrel (51) and one end of the cutting head is fixedly connected with the piston (56) through the round hole; one end of the driving rod is fixedly connected with the transmission gear (54), the other end of the driving rod is hinged with one end of the transmission rod (55), and the other end of the transmission rod (55) is hinged with one end of the cutting head (57);

the power source (8) is electrically connected with the first motor (44), the second motor (49) and the third motor (52) through connecting wires (9), the sample fixing device (6) is arranged in the accommodating cavity, the sample fixing device (6) consists of two supports (61), two clamps (62) and two baffles (63), the two supports (61) are oppositely arranged in the accommodating cavity, the two clamps (62) are respectively fixed at the upper ends of the two supports (61), and the two baffles (63) are respectively arranged on the side surfaces of the two supports (61); the upper ends of the two baffles (63) are respectively provided with a plumb pole (64), and the dust removing device (7) is communicated with the accommodating cavity through a pipeline, and comprises the following concrete steps:

A. manufacturing a rock sample (11) and a positioning line mark: after selecting the property of the rock body, manufacturing the rock body into a cylindrical rock sample, and marking a radial positioning line (11-1) penetrating through the center of the end surface and an axial positioning line (11-2) which is in the same plane with the radial positioning line (11-1) on the end surface and the side surface of the cylinder of the rock sample (11) respectively;

B. marking the position of prefabricated through cracks: according to the rock sample penetrating slit position required by the experiment, calibrating the positions of a first positioning hole (11-3) and a second positioning hole (11-4) on an axial positioning line (11-2) of a rock sample (11), and marking a prefabricated slit path (11-5) between the first positioning hole (11-3) and the second positioning hole (11-4); thus, the through crack can be ensured to pass through the central axis of the rock sample (11);

C. positioning of the rock sample (11) and the work table (3): opening a glass cover plate (30), placing a rock sample (11) in a sample fixing device (6), rotating the rock sample (11) to enable a radial positioning line (11-1) of the rock sample to coincide with a plumb bob (64), locking and fixing the rock sample (11) through a clamp (62), covering the glass cover plate (30), and moving a workbench (3) through a handle (31) to enable a drill bit (50) of a drilling device (4) to be aligned with a first positioning hole (11-3) marked by the rock sample (11);

D. drilling a first positioning hole (11-3) and a second positioning hole (11-4) on a rock sample (11): starting a power source (8) and a dust removing device (7), then starting to rotate a first motor (44) through a first motor forward and backward rotation button (4-3), driving an inner shell (42) to descend through a transmission nut (48) until the vertical distance between a drill bit (50) and a first positioning hole (11-3) is smaller than 3mm, driving the drill bit (50) to rotate through a second motor start and stop button (4-1) and a second motor rotating speed regulating button (4-2), then starting to drill the first positioning hole (11-3) through the drill bit (50), controlling the drill bit (50) to stop rotating through the second motor start and stop button (4-1) after the drilling of the first positioning hole (11-3) is completed, and simultaneously enabling the inner shell (42) to ascend through the first motor forward and backward rotation button (4-3); then repeating the drilling process of the first (4) positioning hole (11-3) to finish the drilling of the second positioning hole (11-4);

E. manufacturing a transparent crack: loosening the positioning bolt (32), moving the workbench (3) through the handle (31) to enable the cutting head (57) of the cutting device (5) to be aligned with the first positioning hole (11-3), controlling the cutting head (57) to start cutting through the third motor start-stop button (58) and the third motor rotating speed adjusting button (59), slowly moving the workbench (3) along the prefabricated crack path (11-5) towards the second positioning hole (11-4) until the permeable crack is manufactured, and taking out the rock sample (11).

2. The working method for preparing a rock specimen through slit device according to claim 1, further comprising a plurality of inclined struts (24), wherein the plurality of inclined struts (24) are fixedly connected between the upright (21) and the cross beam (22) and between the upright (21) and the connecting beam (23), respectively.

3. The working method for preparing a rock sample through slit device according to claim 1, further comprising a second motor start-stop button (4-1), a second motor rotation speed adjusting button (4-2) and a first motor forward and reverse rotation button (4-3), wherein the second motor start-stop button (4-1), the second motor rotation speed adjusting button (4-2) and the first motor forward and reverse rotation button (4-3) are arranged on the surface of the shell (41), the second motor start-stop button (4-1) and the second motor rotation speed adjusting button (4-2) are connected with a second motor (49), and the first motor forward and reverse rotation button (4-3) is connected with a first motor (44).

4. The working method for preparing a rock sample through slit device according to claim 1, further comprising a third motor start-stop button (58) and a third motor rotation speed adjusting button (59), wherein the third motor start-stop button (58) and the third motor rotation speed adjusting button (59) are arranged on the surface of the cylinder barrel (51), and the third motor start-stop button (58) and the third motor rotation speed adjusting button (59) are respectively connected with the third motor (52).

5. The working method for preparing a rock specimen through slit device according to claim 1, further comprising a handle (31) and a positioning bolt (32), wherein the handle (31) is fixed at the upper end of the working platform (3), and the positioning bolt (32) is arranged at the side part of the working platform (3).

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