Drilling sampling device for coal exploration

Abstract

The invention discloses a drilling sampling device for coal exploration, and relates to the technical field of coal exploration. The device comprises a bottom plate, a vertical frame is fixedly connected to the surface of the bottom plate, an auxiliary frame is slidably connected to the vertical frame, a drilling main barrel is rotationally connected into the auxiliary frame, a drill bit is fixedly connected to the bottom face of the drilling main barrel, and the two ends of the drilling main barrel and the two ends of the drill bit are open; in the process of drilling a coal seam, an arc-shaped clamping plate is hydraulically pushed to clamp a coal core, so that a drilling auxiliary barrel keeps unchanged relative to the position of the coal core, a drilling main barrel continuously moves downwards, an arc-shaped curved rail is driven to move downwards, the arc-shaped curved rail pulls an arc-shaped cutter to change the angle, and the coal seam is drilled. The coal core in the drilling auxiliary barrel is cut off, after the arc-shaped clamping plate is loosened, the drilling auxiliary barrel is reset, the sampling coal core can be cut off for multiple times under the condition that the drilling main barrel does not stop after the process is continued, and the working efficiency of coal drilling sampling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal exploration, and in particular to a borehole sampling device for coal exploration. Background Art

[0002] The main purpose of coal exploration is to understand the material composition, properties, technological performance, and industrial utilization value of coal seams by collecting samples in the coal seams. During the process of coal exploration, the drilling method is usually used for sampling, that is, by rotating the drill barrel and drilling it into the coal seam. The bottom surface of the drill barrel is an open ring. After drilling into the coal seam, the sampled material is cylindrical. In the prior art, in order to facilitate the extraction of the cylindrical coal core, it is necessary to stop the drilling of the drill barrel, and then cut the coal core through a cutting device. After completing the above work, finally, the coal core is clamped out for detection. The coal core sampling process requires collecting multiple coal core samples. Each time a new coal core is cut, it is necessary to stop the drilling of the drill barrel and then cut it, resulting in a lack of continuity in the sampling process and a low efficiency of borehole sampling. Summary of the Invention

[0003] The purpose of the present invention is to solve the disadvantages in the prior art that each time the target coal core is cut, it is necessary to stop the drill barrel before cutting, resulting in low continuity and slow working efficiency when sampling the coal core, and to propose a borehole sampling device for coal exploration.

[0004] In order to achieve the above purpose, the present invention adopts the following technical scheme: Design a borehole sampling device for coal exploration, including a bottom plate. A vertical frame is fixedly connected to the surface of the bottom plate. An auxiliary frame is slidably connected to the vertical frame. A main drilling barrel is rotatably connected inside the auxiliary frame. A drill bit is fixedly connected to the bottom surface of the main drilling barrel. Both ends of the main drilling barrel and the drill bit are open. A continuous cutting assembly is slidably connected to the inner wall of the main drilling barrel. The continuous cutting assembly includes a secondary drilling barrel. The secondary drilling barrel is slidably connected to the main drilling barrel. A plurality of return springs are fixedly connected between the secondary drilling barrel and the main drilling barrel. Two arc-shaped grooves are symmetrically opened on the inner wall of the secondary drilling barrel. Arc-shaped plates are slidably arranged in the arc-shaped grooves. Two cutting members are rotatably connected to the secondary drilling barrel. A circular rail is fixedly connected to the surface of the secondary drilling barrel. A plurality of sliders are slidably connected to the secondary drilling barrel. A hydraulic pressing member is fixedly connected between each slider.

[0005] Preferably, the cutting member includes two rotating shafts which are rotatably connected to the drilling auxiliary barrel. The cutting member includes two rotating shafts which are rotatably connected to the drilling auxiliary barrel. A mating gear is fixedly connected to the end of the rotating shaft. An arc-shaped cutter is fixedly connected to the circumferential side of the rotating shaft. The cutting edges of the two arc-shaped cutters face in opposite directions, and the movement paths of the two arc-shaped cutters both pass through the axis of the drilling main barrel. An arc-shaped rack is fixedly connected to the side of the arc-shaped plate close to the axis of the drilling auxiliary barrel. The mating gear meshes with the arc-shaped rack. A connecting sleeve is fixedly connected to the bottom surface of the arc-shaped plate, and a control sub-component is fixedly connected to the connecting sleeve.

[0006] Preferably, the control sub-component includes an electromagnet which is fixedly connected to the connecting sleeve. A sliding shaft is slidably connected to the connecting sleeve. A guiding ball is fixedly connected to one end of the sliding shaft, and an iron block is fixedly connected to the other end of the sliding shaft. A pressing spring is fixedly connected between the iron block and the connecting sleeve. Two curved panels are fixedly connected to the drilling main barrel. An arc-shaped curved rail is fixedly connected to the curved panel. The arc-shaped curved rail and the guiding ball are slidably matched. The arc-shaped curved rail is symmetrically divided into a cutting part and a reset part, and the initial positions of the guiding balls are both at the bottom end of the cutting part.

[0007] Preferably, the oil pressing member includes an oil pressing box which is fixedly connected to the slider. A number of piston barrels are uniformly communicated with the oil pressing box. A piston plate is slidably connected in the piston barrel. A piston rod is fixedly connected to the side of the piston plate, and each piston rod is perpendicular to the axis of the drilling main barrel.

[0008] Preferably, a push oil pipe is communicated with the surface of the oil pressing box. A fixing frame is fixedly connected to the surface of the oil pressing box. An electric telescopic rod is fixedly connected to the bottom surface of the fixing frame. A plug is fixedly connected to the output end of the electric telescopic rod, and the plug is slidably matched with the push oil pipe.

[0009] Preferably, an arc-shaped clamping plate is fixedly connected to the end of the piston rod. The arc of the arc-shaped clamping plate is the same as the inner hole arc of the drill bit. A number of locking bars are fixedly connected to the arc-shaped clamping plate.

[0010] Preferably, a hydraulic cylinder is fixedly connected to the surface of the bottom plate. The output end of the hydraulic cylinder is fixedly connected to an annular sleeve plate. The annular sleeve plate is fixedly connected to the auxiliary frame. A motor is fixedly connected to the bottom surface of the annular sleeve plate. An output shaft is rotatably connected through the annular sleeve plate. The output end of the motor is fixedly connected to the output shaft. A driving gear is fixedly connected to the end of the output shaft. A toothed ring is fixedly connected to the circumferential side of the drilling main barrel. The driving gear meshes with the toothed ring. A ring plate is fixedly connected to the circumferential side of the drilling main barrel. The ring plate and the annular sleeve plate are rotatably matched.

[0011] Preferably, two limiting grooves are evenly formed in the inner wall of the main drilling barrel, and two limiting blocks are fixedly connected to the outer peripheral side of the auxiliary drilling barrel. The limiting blocks are slidably matched with the limiting grooves.

[0012] The beneficial effects of a coal exploration drilling sampling device proposed by the present invention are as follows: In the present invention, the electric telescopic rod pushes the plug head to move. The movement of the plug head increases the hydraulic pressure in the oil pressing box, thereby driving each arc-shaped clamping plate to clamp the coal core. During the drilling and sampling process, the main drilling barrel always rotates continuously and moves downward. At this time, after the arc-shaped clamping plate clamps the target coal core, the auxiliary drilling barrel still rotates synchronously with the main drilling barrel, but the horizontal height remains unchanged. The horizontal position of the main drilling barrel gradually decreases relative to the auxiliary drilling barrel. The downward movement of the main drilling barrel drives the arc-shaped curved rail to descend. The arc-shaped curved rail guides the guide ball, causing it to rotate. The guide ball drives the arc-shaped plate to move in the arc-shaped groove. Since the arc-shaped rack and the mating gear are meshed with each other, as the arc-shaped plate moves, the arc-shaped cutter rotates around the rotating shaft to complete a cutting of the target coal core. That is, after the hydraulic pressure drives the arc-shaped clamping plate to clamp the target coal core, the annular cutter can automatically complete the cutting of the target coal core without stopping the main drilling barrel, which is convenient for the user to take out the sampled object. In the present invention, after completing one cutting, the arc-shaped clamping plate is loosened, and the electromagnet is energized. The electromagnet pulls the iron block to move. The iron block stretches the abutting spring and drags the guide ball to move. At this time, the guide ball disengages from the arc-shaped curved rail. After losing the clamping force of the arc-shaped clamping plate, the reset spring resets the auxiliary drilling barrel. After resetting, the electromagnet is powered off, and the guide ball re-enters the arc-shaped curved rail. After cutting the coal core once, the clamping jaw is loosened and the electromagnet is controlled to be powered on and off, so that the auxiliary drilling barrel and the arc-shaped cutter fall back to their original positions. When it is necessary to cut the target coal core again, after clamping the core with the arc-shaped clamping jaw again, the coal core can be automatically cut. Without stopping the main drilling barrel, the target coal core can be continuously cut multiple times, improving the continuity of coal exploration drilling and sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a coal exploration drilling sampling device.

[0014] Figure 2 It is a schematic structural diagram of the main drilling barrel of the present invention.

[0015] Figure 3 It is a schematic sectional structural diagram of the main drilling barrel of the present invention.

[0016] Figure 4 It is Figure 3 The enlarged view of part A in

[0017] Figure 5 This is the assembly drawing of the main drilling barrel and the auxiliary drilling barrel of the present invention.

[0018] Figure 6 This is the schematic sectional structure diagram of the auxiliary drilling barrel of the present invention.

[0019] Figure 7 This is the assembly drawing of the arc rack and the mating gear of the present invention.

[0020] Figure 8 This is the assembly drawing of the main drilling barrel and the curved panel of the present invention.

[0021] Figure 9 This is the assembly drawing of the auxiliary drilling barrel and the annular rail of the present invention.

[0022] Figure 10 This is the schematic sectional structure diagram of the oil pressing box of the present invention.

[0023] Figure 11 is Figure 10 the enlarged view of part B in

[0024] Figure 12 This is the schematic sectional structure diagram of the connecting sleeve of the present invention.

[0025] In the attached drawings, the list of components represented by each reference numeral is as follows: 1. Bottom plate; 2. Vertical frame; 3. Auxiliary frame; 4. Main drilling barrel; 5. Drill bit; 6. Limit groove; 7. Limit block; 8. Auxiliary drilling barrel; 9. Return spring; 10. Arc groove; 11. Arc plate; 12. Arc rack; 13. Connecting sleeve; 14. Guide ball; 15. Rotating shaft; 16. Mating gear; 17. Arc cutter; 18. Curved panel; 19. Arc curved rail; 20. Annular rail; 21. Slide block; 22. Oil pressing box; 23. Piston barrel; 24. Piston plate; 25. Piston rod; 26. Arc clamping plate; 27. Locking strip; 28. Push oil pipe; 29. Fixed frame; 30. Electric telescopic rod; 31. Plug; 32. Hydraulic cylinder; 33. Annular sleeve plate; 34. Motor; 35. Driving gear; 36. Tooth ring; 37. Ring plate; 38. Slide shaft; 39. Iron block; 40. Resisting spring; 41. Electromagnet. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Embodiment 1 Refer to Figure 1-11, the present invention is a drilling sampling device for coal exploration, including a bottom plate 1. A vertical frame 2 is fixedly connected to the surface of the bottom plate 1. An auxiliary frame 3 is slidably connected to the vertical frame 2. A main drilling barrel 4 is rotatably connected inside the auxiliary frame 3. A drill bit 5 is fixedly connected to the bottom surface of the main drilling barrel 4. Both ends of the main drilling barrel 4 and the drill bit 5 are open. A continuous cutting assembly is slidably connected to the inner wall of the main drilling barrel 4. The continuous cutting assembly includes an auxiliary drilling barrel 8. The auxiliary drilling barrel 8 is slidably connected to the main drilling barrel 4. A plurality of return springs 9 are fixedly connected between the auxiliary drilling barrel 8 and the main drilling barrel 4. Two arc-shaped grooves 10 are symmetrically formed in the inner wall of the auxiliary drilling barrel 8. Arc-shaped plates 11 are slidably arranged in the arc-shaped grooves 10. Two cutting members are rotatably connected to the auxiliary drilling barrel 8. The cutting members are used to cut the coal core entering the main drilling barrel 4. A circular rail 20 is fixedly connected to the surface of the auxiliary drilling barrel 8. A plurality of sliders 21 are slidably connected to the auxiliary drilling barrel 8. A pressure oil member is fixedly connected between each slider 21; The cutting members include two rotating shafts 15. The rotating shafts 15 are rotatably connected to the auxiliary drilling barrel 8. A mating gear 16 is fixedly connected to the end of the rotating shaft 15. An arc-shaped cutting knife 17 is fixedly connected to the circumferential side of the rotating shaft 15. The cutting edges of the two arc-shaped cutting knives 17 face in opposite directions, and the movement paths of the two arc-shaped cutting knives 17 both pass through the axis of the main drilling barrel 4. An arc-shaped rack 12 is fixedly connected to the side of the arc-shaped plate 11 close to the axis of the auxiliary drilling barrel 8. The mating gear 16 meshes with the arc-shaped rack 12. A connecting sleeve 13 is fixedly connected to the bottom surface of the arc-shaped plate 11. A control sub-component is fixedly connected to the connecting sleeve 13; Two curved panels 18 are fixedly connected to the main drilling barrel 4. An arc-shaped curved rail 19 is fixedly connected to the curved panel 18. The arc-shaped curved rail 19 is slidably matched with a guide ball 14. The arc-shaped curved rail 19 is symmetrically divided into a cutting part and a reset part. The initial positions of the guide balls 14 are both located at the bottom end of the cutting part. Two limiting grooves 6 are evenly formed in the inner wall of the main drilling barrel 4. Two limiting blocks 7 are fixedly connected to the outer peripheral side of the auxiliary drilling barrel 8. The limiting blocks 7 are slidably matched with the limiting grooves 6.

[0028] The operation process of this embodiment is as follows: Fix the bottom plate 1 on the surface of the coal layer where drilling sampling is required. The main drilling barrel 4 rotates continuously and moves downward at a uniform speed. The drill bit 5 moves synchronously with the main drilling barrel 4, cutting the coal at the bottom into a cylindrical shape. The diameter of the coal core is the same as the inner diameter of the drill bit 5, and the height of the coal core is the same as the drilling depth of the drill bit 5. By rotating the annular drill bit 5 and continuously pushing it into the coal layer, the coal seam to be sampled can be cut into a cylindrical shape, facilitating subsequent sampling of the coal core; Since the limit block 7 on the drilling auxiliary barrel 8 is in sliding fit with the limit groove 6 of the drilling main barrel 4, the drilling auxiliary barrel 8 always remains synchronized with the drilling main barrel 4 in rotation during the drilling process. After the core enters the drilling main barrel 4, the horizontal height of the drilling auxiliary barrel 8 is kept unchanged at this time. Since the drilling main barrel 4 always keeps rotating continuously and moving downward at a constant speed, the relative height between the drilling auxiliary barrel 8 and the drilled coal core remains the same, and the position of the drilling main barrel 4 gradually moves downward relative to the drilling auxiliary barrel 8. The initial position of the guide ball 14 is at the lowermost end of the cutting part of the arc-shaped curved rail 19, as Figure 7 shown. At this time, since the horizontal height of the drilling auxiliary barrel 8 remains unchanged, as the drilling main barrel 4 continues to move downward, the drilling main barrel 4 drives the curved panel 18 to move downward, and the curved panel 18 drives the arc-shaped curved rail 19 to move downward. Because of the sliding fit between the guide ball 14 and the arc-shaped curved rail 19, and the sliding fit between the arc-shaped plate 11 and the arc-shaped groove 10, that is, the process in which the guide ball 14 moves from the bottom end of the cutting part of the arc-shaped curved rail 19 to the top end of the reset part of the arc-shaped curved rail 19; The arc-shaped plate 11 makes an arc reciprocating movement in the arc-shaped groove 10. When the guide ball 14 moves from the bottom end to the top end in the cutting part of the arc-shaped curved rail 19, it drives the arc-shaped rack 12 to rotate around the drilling auxiliary barrel 8, and the arc-shaped rack 12 drives the annular cutter to move inward to cut the coal core. When the guide ball 14 moves from the bottom end to the top end in the reset part of the arc-shaped curved rail 19, the arc-shaped cutter 17 is retracted in the same way. It can make the two annular cutters in the drilling auxiliary barrel 8 make a reciprocating movement during the downward movement of the drilling main barrel 4; Although the horizontal height between the drilling auxiliary barrel 8 and the coal core remains unchanged, it is still affected by the drilling main barrel 4 and keeps rotating. The arc-shaped cutter 17 is rotationally connected to the drilling auxiliary barrel 8 through the rotating shaft 15 and also rotates following the drilling auxiliary barrel 8. That is, while the annular cutters in the drilling auxiliary barrel 8 keep rotating, they make a reciprocating movement inward. When the two annular cutters make a reciprocating movement, they cut the cylindrical coal core. In the prior art, when cutting the coal core, it is necessary to stop the continuous penetration of the drill barrel, and then the core can be cut through the cutting device. In this device, by fixing the horizontal height of the drilling auxiliary barrel 8, when the drilling main barrel 4 moves downward, the arc-shaped curved rail 19 drives the annular cutter to make a reciprocating movement, which can realize cutting the target sampling coal core without stopping the operation of the drilling device, thereby improving the efficiency of the coal exploration drilling sampling work.

[0029] Embodiment 2 By fixing the horizontal height of the drilling auxiliary barrel 8, although it can complete one cut of the coal core, it cannot cut the same coal core multiple times, reducing the practicality of the borehole sampling device. Therefore, please refer to Figure 9-11, on the basis of the first specific embodiment, the control sub-component includes an electromagnet 41. The electromagnet 41 is fixedly connected to the connecting sleeve 13. A sliding shaft 38 is slidably connected to the connecting sleeve 13. One end of the sliding shaft 38 is fixedly connected to a guiding ball 14, and the other end of the sliding shaft 38 is fixedly connected to an iron block 39. A pressing spring 40 is fixedly connected between the iron block 39 and the connecting sleeve 13; The oil pressing component includes an oil pressing box 22. The oil pressing box 22 is fixedly connected to the slider 21. A number of piston barrels 23 are uniformly communicated with the oil pressing box 22. A piston plate 24 is slidably connected in the piston barrel 23. A piston rod 25 is fixedly connected to the side surface of the piston plate 24. Each piston rod 25 is perpendicular to the axis of the drilling main barrel 4; A push oil pipe 28 is communicated with the surface of the oil pressing box 22. A fixing frame 29 is fixedly connected to the surface of the oil pressing box 22. An electric telescopic rod 30 is fixedly connected to the bottom surface of the fixing frame 29. A plug 31 is fixedly connected to the output end of the electric telescopic rod 30. The plug 31 is slidably matched with the push oil pipe 28. An arc-shaped clamping plate 26 is fixedly connected to the end of the piston rod 25. The bending arc of the arc-shaped clamping plate is the same as the inner hole arc of the drill bit 5. A number of locking strips 27 are fixedly connected to the arc-shaped clamping plate 26.

[0030] The operation process of this embodiment is as follows: After filling the oil pressing box 22 with oil and sealing it, each time it is necessary to cut the coal core of this section, the electric telescopic rod 30 is used to push the plug 31 to move in the push oil pipe 28, and the hydraulic pressure in the oil pressing box 22 increases, thereby pushing each piston rod 25 to move towards the core position. The arc-shaped clamping plate 26 and the locking strip 27 at the end of the piston rod 25 clamp the core. At this time, the oil pressing box 22 is at the same horizontal height as the core and does not rotate. Since the slider 21 at the bottom of the oil pressing box 22 is slidably connected to the annular rail 20, and the annular rail 20 is fixedly connected to the drilling auxiliary barrel 8, by clamping the core with each arc-shaped clamping plate 26, the horizontal height of the drilling auxiliary barrel 8 and the core can be kept unchanged, and it can still rotate synchronously with the drilling main barrel 4. That is, when the arc-shaped clamping plate 26 clamps the core during use, the annular cutter starts to cut the coal core of this section; After the section of coal core is cut, the plug 31 is moved upward, the hydraulic pressure in the oil pressing box 22 is restored, and each arc-shaped clamping plate 26 returns to its original position. And through the electromagnet 41, the iron block 39 is attracted. The iron block 39 pulls the sliding shaft 38 to move. The sliding shaft 38 moves the guiding ball 14 out of the arc-shaped curved rail 19. Affected by the pulling force of the return spring 9, the drilling auxiliary barrel 8 moves to the bottom in the drilling main barrel 4. The electromagnet 41 is powered off, and the pressing spring 40 pushes the guiding ball 14 into the arc-shaped curved rail 19 again. When it is necessary to cut the coal core again, similarly, the plug 31 can be pushed by the electric telescopic rod 30 to perform a new cutting operation. After the arc-shaped clamping plate 26 is loosened, the drilling auxiliary barrel 8 is pulled by the return spring 9 to the initial position. Whether the guiding ball 14 is connected to the arc-shaped curved rail 19 is controlled by the energization and power-off of the electromagnet 41. So that when the drilling auxiliary barrel 8 drops, the annular cutting tool is always located at the initial position of cutting. After the coal core is clamped again by the arc-shaped clamping plate 26, a new cutting process can be carried out. It can reset the drilling auxiliary barrel 8 after the cutting is completed. Without stopping the drilling main barrel 4, the annular cutting tool 17 can cut the coal core entering the drilling main barrel 4 multiple times, improving the continuity of work.

[0031] Embodiment 3 During the downward drilling process of the drilling main barrel 4, the stability is relatively low. The drilling main barrel 4 is prone to deviation, which will reduce the quality of the sampled coal core and thus affect the sampling and detection results. For this reason, please refer to Figure 1-2 , on the basis of the specific Embodiment 1, a hydraulic cylinder 32 is fixedly connected to the surface of the bottom plate 1. The output end of the hydraulic cylinder 32 is fixedly connected with an annular sleeve plate 33. The annular sleeve plate 33 is fixedly connected with the auxiliary frame 3. The bottom surface of the annular sleeve plate 33 is fixedly connected with a motor 34. An output shaft is rotatably connected through the annular sleeve plate 33. The output end of the motor 34 is fixedly connected with the output shaft. A driving gear 35 is fixedly connected to the end of the output shaft. A toothed ring 36 is fixedly connected to the circumferential side of the drilling main barrel 4. The driving gear 35 meshes with the toothed ring 36. A ring plate 37 is fixedly connected to the circumferential side of the drilling main barrel 4. The ring plate 37 is rotationally matched with the annular sleeve plate 33.

[0032] The operation process of this embodiment is as follows: The driving gear 35 is driven to rotate by the motor 34. The driving gear 35 drives the toothed ring 36 to rotate. The toothed ring 36 drives the drilling main barrel 4 to rotate to control the rotation of the drilling main barrel 4. Through the expansion and contraction of the hydraulic cylinder 32, the drilling main barrel 4 is controlled to drill downward. The drilling main barrel 4 is inserted and matched with the vertical frame 2. The vertical frame 2 prevents the drilling main barrel 4 from deviating outward during the rotational downward movement, improving the stability of the drilling main barrel 4 for cutting the target coal core. The auxiliary frame 3 is inserted and matched with the vertical frame 2, and the auxiliary frame 3 is fixedly connected with the annular sleeve plate 33, which can improve the stability of the drilling main barrel 4 during the rotational descent process and prevent it from deviating and affecting the sampling quality of the coal core.

[0033] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A drilling sampling device for coal exploration, comprising a bottom plate (1), characterized in that: The surface of the bottom plate (1) is fixedly connected to a stand frame (2), the stand frame (2) is slidably connected to an auxiliary frame (3), a drilling main barrel (4) is rotatably connected inside the auxiliary frame (3), a drill bit (5) is fixedly connected to the bottom surface of the drilling main barrel (4), both ends of the drilling main barrel (4) and the drill bit (5) are open, a continuous cutting assembly is slidably connected to the inner wall of the drilling main barrel (4), and the continuous cutting assembly includes a drilling auxiliary barrel (8), the drilling auxiliary barrel (8) is slidably connected to the drilling main barrel (4), and the A plurality of return springs (9) are fixedly connected between the drilling auxiliary barrel (8) and the drilling main barrel (4); two arc grooves (10) are symmetrically provided on the inner wall of the drilling auxiliary barrel (8); an arc plate (11) is slidably arranged in the arc groove (10); two cutting pieces are rotatably connected to the drilling auxiliary barrel (8); a ring rail (20) is fixedly connected to the surface of the drilling auxiliary barrel (8); a plurality of sliding blocks (21) are slidably connected to the drilling auxiliary barrel (8); and an oil pressing piece is fixedly connected between each of the sliding blocks (21).

2. A drilling sampling device for coal exploration according to claim 1, characterized in that: The cutting piece comprises two rotating shafts (15), the rotating shafts (15) are rotatably connected to the drilling auxiliary barrel (8), the ends of the rotating shafts (15) are fixedly connected to matching gears (16), the peripheral side surfaces of the rotating shafts (15) are fixedly connected to arc-shaped cutters (17), the cutting edges of the two arc-shaped cutters (17) face opposite directions, and the movement paths of the two arc-shaped cutters (17) pass through the axis of the drilling main barrel (4), the arc-shaped plate (11) is fixedly connected to an arc-shaped rack (12) on one side close to the axis of the drilling auxiliary barrel (8), the matching gear (16) and the arc-shaped rack (12) are meshed, the bottom surface of the arc-shaped plate (11) is fixedly connected to a connecting sleeve (13), and the connecting sleeve (13) is fixedly connected to a control sub-component.

3. A drilling sampling device for coal exploration according to claim 2, characterized in that: The control subcomponent comprises an electromagnet (41), the electromagnet (41) being fixedly connected to a connecting sleeve (13), a sliding shaft (38) being slidably connected to the connecting sleeve (13), one end of the sliding shaft (38) being fixedly connected to a guide ball (14), the other end of the sliding shaft (38) being fixedly connected to an iron block (39), a tightening spring (40) being fixedly connected between the iron block (39) and the connecting sleeve (13), two curved panels (18) being fixedly connected to the drilling main barrel (4), an arc-shaped curved track (19) being fixedly connected to the curved panel (18), the arc-shaped curved track (19) being slidably matched with the guide ball (14), the arc-shaped curved track (19) being symmetrically divided into a cutting portion and a reset portion, the initial position of the guide ball (14) being located at the bottom end of the cutting portion.

4. A drilling sampling device for coal exploration according to claim 1, characterized in that: The oil pressure member comprises an oil pressure box (22), the oil pressure box (22) is fixedly connected to the slider (21), a plurality of piston barrels (23) are evenly connected and arranged on the oil pressure box (22), a piston plate (24) is slidably connected inside the piston barrel (23), a piston rod (25) is fixedly connected to the side of the piston plate (24), and each piston rod (25) is perpendicular to the axis of the drilling main barrel (4).

5. A drilling sampling device for coal exploration according to claim 4, characterized in that: The surface of the oil pressure box (22) is connected to an oil pushing pipe (28), the surface of the oil pressure box (22) is fixedly connected to a fixing frame (29), the bottom surface of the fixing frame (29) is fixedly connected to an electric telescopic rod (30), the output end of the electric telescopic rod (30) is fixedly connected to a plug (31), and the plug (31) is slidably matched with the oil pushing pipe (28).

6. A drilling sampling device for coal exploration according to claim 4, characterized in that: The end of the piston rod (25) is fixedly connected to an arc-shaped clamping plate (26), the arc of the arc-shaped clamping plate (26) is the same as the arc of the inner hole of the drill bit (5), and a plurality of locking strips (27) are fixedly connected to the arc-shaped clamping plate (26).

7. A drilling sampling device for coal exploration according to claim 1, characterized in that: A hydraulic cylinder (32) is fixedly connected to the surface of the bottom plate (1); an annular sleeve plate (33) is fixedly connected to the output end of the hydraulic cylinder (32); the annular sleeve plate (33) is fixedly connected to the auxiliary frame (3); a motor (34) is fixedly connected to the bottom surface of the annular sleeve plate (33); an output shaft is rotatably connected to the annular sleeve plate (33); the output end of the motor (34) is fixedly connected to the output shaft; a driving gear (35) is fixedly connected to the end of the output shaft; a gear ring (36) is fixedly connected to the peripheral side of the drilling main barrel (4); the driving gear (35) and the gear ring (36) are meshed with each other; a ring plate (37) is fixedly connected to the peripheral side of the drilling main barrel (4); the ring plate (37) and the annular sleeve plate (33) are rotatably matched.

8. A drilling sampling device for coal exploration according to claim 1, characterized in that: The inner wall of the drilling main barrel (4) is evenly provided with two limit grooves (6), and the outer peripheral side of the drilling auxiliary barrel (8) is fixedly connected with two limit blocks (7), and the limit blocks (7) are slidably matched with the limit grooves (6).

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