Coalfield geological drilling coring device

Abstract

The present invention is applicable to the technical field of geological drilling equipment, and provides a coalfield geological drilling coring device, comprising a frame, a mounting plate, a coring barrel, a first stepping motor, a lifting mechanism and a stabilizing mechanism, wherein the stabilizing mechanism comprises a stabilizing plate, an elastic telescopic rod, a guide sleeve and a scissor mechanism; the coalfield geological drilling coring device also comprises an auxiliary component, wherein the auxiliary component comprises an arc plate, a connecting ring, a connecting rod and a switching mechanism, wherein the switching mechanism comprises a side plate, a winding wheel, a winding rope and a volute spring. The coalfield geological drilling coring device provided by the present invention is provided with a frame, a mounting plate, a coring barrel, a first stepping motor, a lifting mechanism and a stabilizing mechanism. As the coring barrel gradually goes deeper, the elastic telescopic rod gradually increases the force of the stabilizing plate on the coring barrel, thereby improving the stability of the coring barrel during the drilling process, and avoiding that as the coring barrel gradually goes deeper, the vibration intensifies, which may cause the core body to be damaged, thereby affecting the coring quality.

Description

Technical Field

[0001] The invention belongs to the technical field of geological drilling equipment, and in particular relates to a coalfield geological drilling coring device. Background Art

[0002] In the process of geological history, the distribution area of ​​coal-bearing rock systems formed and developed roughly continuously in the same geological period is called a coalfield. Coalfields are mostly in the form of basins, so they are also called coal basins.

[0003] In the process of coal mining, geological drilling is a very important technical means. Through geological drilling equipment, rock cores, ore samples and soil samples are obtained for analysis and research, which are used to measure the physical, mechanical properties and indicators of rocks and soil layers, so as to facilitate subsequent more accurate surveys.

[0004] After searching, Chinese patent CN219241838U discloses a device for improving coalfield geological drilling and coring, which includes a mounting plate and a coring drill, a side wall of the mounting plate is provided with a fixing frame, a drilling rig is provided on the top of the fixing frame, a drill rod is provided on the output shaft of the drilling rig, a connecting seat is provided at one end of the coring drill, and one end of the drill rod is embedded and installed in the connecting seat.

[0005] Although the above-mentioned prior art can protect the coring drill, as the coring drill drills deeper and deeper, the resistance encountered by the coring drill becomes greater and greater, and the vibration of the coring drill gradually intensifies, causing the coring drill to become gradually unstable during the gradual descent, making it easy for the core material to be damaged during coring, thereby affecting the coring quality. Summary of the invention

[0006] The present invention provides a coalfield geological drilling coring device, aiming to solve the above-mentioned problems.

[0007] The present invention is achieved in that a coalfield geological drilling coring device comprises:

[0008] frame;

[0009] A mounting plate vertically slidably mounted on the rack;

[0010] A coring barrel is rotatably mounted on a mounting plate, wherein a first stepper motor is fixed on the mounting plate for driving the coring barrel to rotate, wherein an output shaft of the first stepper motor is coaxially arranged with the coring barrel and fixedly connected to the top end of the coring barrel;

[0011] A lifting mechanism for driving the mounting plate to move in a vertical direction;

[0012] A stabilizing mechanism for stabilizing a coring barrel during drilling, the stabilizing mechanism comprising:

[0013] Two stabilizing plates are oppositely arranged on both sides of the core barrel and below the mounting plate;

[0014] An elastic telescopic rod fixed on the outer side wall of each stabilizing plate;

[0015] A guide sleeve fixed to the lower surface of the mounting plate and located outside the stabilizing plate, wherein the guide sleeve is sleeved on the elastic telescopic rod;

[0016] A scissor mechanism connected between the top of the frame, the guide sleeve and the elastic telescopic rod;

[0017] The rod end of the top of the scissor mechanism close to the core barrel side is hinged to the top of the frame, the rod end of the top of the scissor mechanism away from the core barrel side is hinged with a slider, the slider is slidably connected to the top of the frame, the rod end of the bottom of the scissor mechanism close to the core barrel side is hinged to the guide sleeve, and the rod end of the bottom of the scissor mechanism away from the core barrel side is hinged to the elastic telescopic rod.

[0018] Preferably, the elastic telescopic rod comprises:

[0019] A mounting sleeve, one end of which is fixedly connected to the stabilizing plate;

[0020] A movable rod is movably inserted from the other end of the installation sleeve, and a first compression spring is arranged in the installation sleeve. Two ends of the first compression spring are respectively fixedly connected to the installation sleeve and the movable rod.

[0021] Preferably, a ball bearing is embedded on the inner side surface of the stabilizing plate, and the ball bearing is used to contact the outer side wall of the core barrel.

[0022] Preferably, the lifting mechanism comprises:

[0023] The lifting screw rods are rotatably mounted on both sides of the frame, and the lifting screw rods penetrate the mounting plate and are threadedly connected thereto;

[0024] A synchronous wheel fixed to the top of the two lifting screw rods, and a synchronous belt is connected between the synchronous wheels of the two lifting screw rods;

[0025] The second stepper motor fixed on the top of the frame is used to drive any lifting screw to rotate.

[0026] Preferably, it also includes auxiliary components, the auxiliary components including:

[0027] A plurality of arc-shaped plates are arranged at intervals in the annular direction and constitute the side wall of the core barrel, one end of the arc-shaped plate is hinged to the core barrel, and the other end of the arc-shaped plate abuts against the core barrel through an inclined surface;

[0028] Rotate the connecting ring installed on the upper part of the core barrel;

[0029] A connecting rod is connected between each arc-shaped plate and the connecting ring, and two ends of the connecting rod are respectively hinged to the arc-shaped plate and the connecting ring.

[0030] Preferably, the auxiliary component further comprises a switching mechanism for automatically switching the connection state between the arc plate and the coring barrel.

[0031] Preferably, the switching mechanism comprises:

[0032] Side plates are arranged on both sides of the connecting ring, and the side plates are fixedly connected to the adjacent guide sleeves;

[0033] Rotating a winding wheel mounted on the outer side wall of the side plate;

[0034] A rope is wound around the winding wheel, one end of which passes through a through hole on the side plate and is connected to a side wall of the core barrel between two arc-shaped plates. A volute spring is installed between the winding wheel and the side plate, and the force of the volute spring on the winding wheel keeps it in the tendency to reel in the rope.

[0035] Preferably, a movable plate is provided in the core-drilling barrel, and a second compression spring is fixedly connected between the upper surface of the movable plate and the top of the inner cavity of the core-drilling barrel.

[0036] Preferably, a leakage protection structure is installed in the coring barrel, and the leakage protection structure comprises:

[0037] An arc-shaped elastic sheet installed at the bottom of each arc-shaped plate, the arc top of the arc-shaped elastic sheet is close to the inner cavity of the core barrel, spikes are arranged on the inner side wall of the arc-shaped elastic sheet, and the bottom end of the arc-shaped elastic sheet is hinged to the arc-shaped plate;

[0038] A transmission rod is hinged at the top of the arc-shaped elastic sheet, and the transmission rod is vertically movable in the arc-shaped plate;

[0039] A driving rod is hinged on the top of the transmission rod. One end of the driving rod away from the transmission rod extends obliquely downward to above the movable plate. A through slot is provided on the driving rod. A pin is passed through the through slot. The pin is fixedly connected to the arc plate.

[0040] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0041] The coalfield geological drilling coring device provided by the present invention is provided with a frame, a mounting plate, a coring barrel, a first stepper motor, a lifting mechanism and a stabilizing mechanism, wherein the stabilizing mechanism includes a stabilizing plate, an elastic telescopic rod, a guide sleeve and a scissor mechanism; the coring barrel gradually enters the underground for coring, and as the mounting plate descends, the mounting plate drives the guide sleeve and the elastic telescopic rod to descend, and at the same time the scissor mechanism is extended, and the rod end of the bottom of the scissor mechanism away from one side of the coring barrel approaches the coring barrel, and as the coring barrel gradually goes deeper, the elastic telescopic rod causes the stabilizing plate to gradually increase the force of the coring barrel on the coring barrel, thereby improving the stability of the coring barrel during the drilling process, and avoiding the possibility that the core body may be damaged due to the intensified vibration as the coring barrel gradually goes deeper, thereby affecting the coring quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a schematic structural diagram of a coalfield geological drilling coring device provided by the present invention.

[0043] Figure 2 yes Figure 1 Enlarged view of point A in .

[0044] Figure 3 The present invention provides a schematic diagram of the positions of a coring barrel and a stabilizing plate in a coalfield geological drilling coring device.

[0045] Figure 4 It is a schematic diagram of an auxiliary structure in a coalfield geological drilling coring device provided by the present invention.

[0046] Figure 5 It is a schematic diagram of another state of an auxiliary structure in a coalfield geological drilling coring device provided by the present invention.

[0047] Figure 6 The present invention is a schematic diagram of a core barrel and a leakage protection structure in a coalfield geological drilling coring device provided by the present invention.

[0048] Figure 7 yes Figure 6 Enlarged view of point B in .

[0049] Notes on the accompanying drawings: 1. Frame; 2. Lifting screw; 3. Core barrel; 4. Rope winding; 5. Winding wheel; 6. Guide sleeve; 7. Mounting sleeve; 8. Movable rod; 9. Mounting plate; 10. Scissors mechanism; 11. Synchronous wheel; 12. Slider; 13. First stepper motor; 14. Synchronous belt; 15. Second stepper motor; 16. First compression spring; 17. Stabilizing plate; 18. Connecting ring; 19. Connecting rod; 20. Arc plate; 21. Ball; 22. Second compression spring; 23. Movable plate; 24. Drive rod; 25. Transmission rod; 26. Arc elastic sheet. DETAILED DESCRIPTION

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] The embodiment of the present invention provides a coalfield geological drilling coring device, such as Figure 1-Figure 7 As shown, it includes: a frame 1; a mounting plate 9 vertically slidably mounted on the frame 1; a coring barrel 3 rotatably mounted on the mounting plate 9, a first stepper motor 13 for driving the coring barrel 3 to rotate is fixed on the mounting plate 9, and can be fixed by bolts, the output shaft of the first stepper motor 13 is coaxially arranged with the coring barrel 3 and fixedly connected to the top of the coring barrel 3, and can be fixed by bolts; a lifting mechanism for driving the mounting plate 9 to move in the vertical direction; a stabilizing mechanism for stabilizing the coring barrel 3 during drilling, the stabilizing mechanism comprising: two stabilizing plates 17 relatively arranged on both sides of the coring barrel 3 and located below the mounting plate 9; the outer wall of each of the stabilizing plates 17 An elastic telescopic rod fixed on the top; a guide sleeve 6 fixed to the lower surface of the mounting plate 9 and located outside the stabilizing plate 17, the guide sleeve 6 being sleeved on the elastic telescopic rod; a scissor mechanism 10 connected to the top of the frame 1, between the guide sleeve 6 and the elastic telescopic rod; the rod end of the top of the scissor mechanism 10 close to the side of the core barrel 3 is hinged to the top of the frame 1, and the rod end of the top of the scissor mechanism 10 away from the side of the core barrel 3 is hinged with a slider 12, and the slider 12 is slidably connected to the top of the frame 1, the rod end of the bottom of the scissor mechanism 10 close to the side of the core barrel 3 is hinged to the guide sleeve 6, and the rod end of the bottom of the scissor mechanism 10 away from the side of the core barrel 3 is hinged to the elastic telescopic rod.

[0053] During operation, the mounting plate 9 is driven downward by the lifting mechanism, and the mounting plate 9 drives the coring barrel 3 to move downward. At the same time, the first stepper motor 13 drives the coring barrel 3 to rotate, and the coring barrel 3 gradually enters the underground for coring. As the mounting plate 9 descends, the mounting plate 9 drives the guide sleeve 6 and the elastic telescopic rod to descend, and at the same time, the scissor mechanism 10 is extended, and the rod end of the bottom of the scissor mechanism 10 away from the side of the coring barrel 3 approaches the coring barrel 3, driving the compressed elastic telescopic rod to gradually shorten. As the coring barrel 3 gradually goes deeper, the elastic telescopic rod causes the stabilizing plate 17 to gradually increase the force on the coring barrel 3, thereby improving the stability of the coring barrel 3 during drilling, and avoiding the core body being damaged due to the increased vibration as the coring barrel 3 gradually goes deeper, thereby affecting the coring quality.

[0054] Wherein, the elastic telescopic rod comprises:

[0055] An installation sleeve 7, one end of which is fixedly connected to the stabilizing plate 17 and can be fixed by welding;

[0056] A movable rod 8 is movably inserted from the other end of the installation sleeve 7. A first compression spring 16 is arranged in the installation sleeve 7. Two ends of the first compression spring 16 are fixedly connected to the installation sleeve 7 and the movable rod 8 respectively.

[0057] The elastic telescopic rod can be telescopic and can provide elastic deformation through the first compression spring 16 .

[0058] In this embodiment, a ball 21 is embedded on the inner side of the stabilizing plate 17. The ball 21 is used to contact the outer wall of the coring barrel 3, which can reduce the friction between the stabilizing plate 17 and the coring barrel 3 and reduce the rotational obstruction of the stabilizing plate 17 to the coring barrel 3.

[0059] In a specific implementation, the lifting mechanism includes: a lifting screw 2 rotatably installed on both sides of the frame 1, which can be rotatably installed through bearings and bearing seats, and the lifting screw 2 passes through the mounting plate 9 and is threadedly connected thereto; a synchronous wheel 11 fixed to the top of the two lifting screws 2, and a synchronous belt 14 is connected between the synchronous wheels 11 of the two lifting screws 2; a second stepper motor 15 fixed to the top of the frame 1, which can be fixed by bolts and is used to drive any one of the lifting screws 2 to rotate, and the output shaft of the second stepper motor 15 can be rotatably connected to the top of the lifting screw 2 through a coupling.

[0060] The second stepping motor 15 drives one lifting screw rod 2 to rotate, and the synchronous wheel 11 and the synchronous belt 14 make the two lifting screw rods 2 rotate synchronously, and the lifting screw rod 2 drives the mounting plate 9 to move up and down.

[0061] Furthermore, it also includes an auxiliary component, which includes: a plurality of arc plates 20 arranged at intervals in the annular direction and constituting the side wall of the core barrel 3, one end of the arc plate 20 is hinged to the core barrel 3, and the other end of the arc plate 20 is in contact with the core barrel 3 through an inclined surface, thereby limiting the rotation of the arc plate 20 toward the inside of the core barrel 3; a connecting ring 18 rotatably installed on the upper part of the core barrel 3, which can be rotatably installed through a bearing; a connecting rod 19 connected between each arc plate 20 and the connecting ring 18, and the two ends of the connecting rod 19 are respectively hinged to the arc plate 20 and the connecting ring 18.

[0062] After coring is completed, when the core material needs to be removed, the connecting ring 18 can be rotated, and the connecting ring 18 drives all the arc plates 20 to rotate synchronously through all the connecting rods 19, and the inner wall of the arc plate 20 is separated from the core material, thereby reducing the squeezing force on the core material and the friction between the core material, so as to facilitate the removal of the core material from the coring barrel 3, avoid the core material being damaged due to the squeezing force and friction during removal, maintain the integrity of the core material, and thus facilitate the subsequent detection of the core material.

[0063] Furthermore, the auxiliary component also includes a switching mechanism for automatically switching the connection state between the arc plate 20 and the coring barrel 3.

[0064] In this embodiment, the switching mechanism includes: side plates arranged on both sides of the connecting ring 18, the side plates are fixedly connected to the adjacent guide sleeves 6 and can be fixed by screws; a winding wheel 5 rotatably installed on the outer wall of the side plate; a rope 4 wound on the winding wheel 5, one end of the rope 4 passes through the through hole on the side plate and is connected to the side wall of the coring barrel 3 located between the two arc plates 20, and a vortex spring is installed between the winding wheel 5 and the side plate, and the force of the vortex spring on the winding wheel 5 keeps it from winding up the rope 4; when drilling and coring, the coring barrel 3 rotates, so that the rope 4 is continuously wound around the coring barrel 3, the arc plate 20 is tied together with the core barrel 3 to form an integral core component. After the core is taken out, the core barrel 3 is lifted out of the ground. When the core material is taken out, the core barrel 3 is reversed so that the rope 4 is gradually loosened, and the core barrel 3 returns to the initial state. The rope 4 loosens the core barrel 3 and the arc plate 20, so that the arc plate 20 can rotate relative to the core barrel 3, and the arc plate 20 and the core barrel 3 are automatically switched to different connection states required during and after the core. The rotatable connecting ring 18 drives all the arc plates 20 to rotate outward, reducing the contact surface with the core material, thereby reducing the resistance to the core material when the core material is taken out. Of course, other manual switching methods can also be used, such as tightening and loosening the bolts to achieve the fixation and rotation of the connecting ring 18 without too many restrictions.

[0065] Preferably, a movable plate 23 is provided in the core-taking barrel 3, and a second compression spring 22 is fixedly connected between the upper surface of the movable plate 23 and the top of the inner cavity of the core-taking barrel 3, and can be fixed by welding.

[0066] It is understandable that in the later stage of the coring operation, the top of the core material collides with the movable plate 23. As the core material continues to enter, under the action of the second compression spring 22, the movable plate 23 squeezes the core material, making the core material tight and of better quality, reducing the generation of gaps.

[0067] In a specific implementation, a leakage protection structure is installed in the core barrel 3, and the leakage protection structure includes: an arc-shaped elastic sheet 26 installed at the lower part of each arc plate 20, the arc top of the arc-shaped elastic sheet 26 is close to the inner cavity of the core barrel 3, and the inner wall of the arc-shaped elastic sheet 26 is provided with spikes. The bottom end of the arc-shaped elastic sheet 26 is hinged to the arc plate 20, and a groove for installing the arc-shaped elastic sheet 26 can be provided on the inner wall of the arc plate 20; a transmission rod 25 is hinged at the top end of the arc-shaped elastic sheet 26, and the transmission rod 25 is vertically movably arranged in the arc plate 20; a driving rod 24 is hinged at the top end of the transmission rod 25, and one end of the driving rod 24 away from the transmission rod 25 extends obliquely downward to above the movable plate 23, and a through groove is provided on the driving rod 24, and a pin is passed through the through groove, and the pin is fixedly connected to the arc plate 20.

[0068] In the later stage of the coring operation, the top of the core material pushes the movable plate 23 upward, and the movable plate 23 moves upward until it pushes the driving rod 24, and the driving rod 24 rotates around the pin shaft, so that the driving rod 24 drives the transmission rod 25 to move downward, and the transmission rod 25 presses down the arc-shaped elastic sheet 26, so that the arc-shaped elastic sheet 26 is deformed and partially enters the coring barrel 3. The spikes enter the outer wall of the core material and fix the bottom of the core material to prevent the core material in the coring barrel 3 from being missed or being partially pulled out by the underground connection when the coring barrel 3 is lifted upward, resulting in reduced coring efficiency and affecting subsequent detection work.

[0069] In summary, the present invention provides a coalfield geological drilling coring device, and its working principle is as follows: during operation, the mounting plate 9 is driven to move downward by the lifting mechanism, and the mounting plate 9 drives the coring barrel 3 to move downward, and at the same time, the first stepper motor 13 drives the coring barrel 3 to rotate, so that the winding rope 4 is continuously wound around the coring barrel 3, and the arc plate 20 is bundled with the coring barrel 3, and the coring barrel 3 gradually enters the underground for coring, and as the mounting plate 9 descends, the mounting plate 9 drives the guide sleeve 6 and the elastic telescopic rod to descend, and at the same time, the scissor mechanism 10 is extended, and the rod end of the bottom of the scissor mechanism 10 away from the side of the coring barrel 3 approaches the coring barrel 3, driving the compressed elastic telescopic rod to gradually shorten, and as the coring barrel 3 gradually goes deeper, The elastic telescopic rod gradually increases the force of the stabilizing plate 17 on the coring barrel 3. In the later stage of the coring operation, the top of the core material pushes the movable plate 23 upward, and the movable plate 23 moves upward until it pushes the driving rod 24. The driving rod 24 rotates around the pin shaft, so that the driving rod 24 drives the transmission rod 25 to move downward. The transmission rod 25 presses down the arc-shaped elastic sheet 26, causing the arc-shaped elastic sheet 26 to deform and partially enter the coring barrel 3. The spikes enter the outer wall of the core material and fix the bottom of the core material. After the coring is completed, the coring barrel 3 is lifted out of the ground. When taking out the core material, the coring barrel 3 is reversed so that the rope 4 is gradually loosened, and the coring barrel 3 returns to the initial state. The rotating connecting ring 18 drives all the arc plates 20 to rotate outward to take out the core material.

[0070] It should be noted that, for the above embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A coalfield geological drilling coring device, comprising: frame; A mounting plate vertically slidably mounted on the rack; A coring barrel is rotatably mounted on a mounting plate, wherein a first stepper motor is fixed on the mounting plate for driving the coring barrel to rotate, wherein an output shaft of the first stepper motor is coaxially arranged with the coring barrel and fixedly connected to the top end of the coring barrel; A lifting mechanism for driving the mounting plate to move in a vertical direction; It is characterized in that it also includes a stabilizing mechanism for stabilizing the coring barrel during the drilling process, and the stabilizing mechanism includes: Two stabilizing plates are oppositely arranged on both sides of the core barrel and below the mounting plate; An elastic telescopic rod fixed on the outer side wall of each stabilizing plate; A guide sleeve fixed to the lower surface of the mounting plate and located outside the stabilizing plate, wherein the guide sleeve is sleeved on the elastic telescopic rod; A scissor mechanism connected between the top of the frame, the guide sleeve and the elastic telescopic rod; The rod end of the top of the scissor mechanism close to the core barrel side is hinged to the top of the frame, the rod end of the top of the scissor mechanism away from the core barrel side is hinged with a slider, the slider is slidably connected to the top of the frame, the rod end of the bottom of the scissor mechanism close to the core barrel side is hinged to the guide sleeve, and the rod end of the bottom of the scissor mechanism away from the core barrel side is hinged to the elastic telescopic rod.

2. The coalfield geological drilling and coring device according to claim 1, characterized in that: The elastic telescopic rod comprises: A mounting sleeve, one end of which is fixedly connected to the stabilizing plate; A movable rod is movably inserted from the other end of the installation sleeve, and a first compression spring is arranged in the installation sleeve. Two ends of the first compression spring are respectively fixedly connected to the installation sleeve and the movable rod.

3. The coalfield geological drilling and coring device according to claim 1, characterized in that: A ball bearing is embedded on the inner side of the stabilizing plate, and the ball bearing is used to contact the outer side wall of the core taking barrel.

4. The coalfield geological drilling and coring device according to claim 1, characterized in that: The lifting mechanism comprises: The lifting screw rods are rotatably mounted on both sides of the frame, and the lifting screw rods penetrate the mounting plate and are threadedly connected thereto; A synchronous wheel fixed to the top of the two lifting screw rods, and a synchronous belt is connected between the synchronous wheels of the two lifting screw rods; The second stepper motor fixed on the top of the frame is used to drive any lifting screw to rotate.

5. The coalfield geological drilling and coring device according to claim 1, characterized in that: Also included are auxiliary components, the auxiliary components comprising: A plurality of arc-shaped plates are arranged at intervals in the annular direction and constitute the side wall of the core barrel, one end of the arc-shaped plate is hinged to the core barrel, and the other end of the arc-shaped plate abuts against the core barrel through an inclined surface; Rotate the connecting ring installed on the upper part of the coring barrel; A connecting rod is connected between each arc-shaped plate and the connecting ring, and two ends of the connecting rod are respectively hinged to the arc-shaped plate and the connecting ring.

6. The coalfield geological drilling and coring device according to claim 5, characterized in that: The auxiliary component also includes a switching mechanism for automatically switching the connection state between the arc plate and the coring barrel.

7. The coalfield geological drilling and coring device according to claim 6, characterized in that: The switching mechanism comprises: Side plates are arranged on both sides of the connecting ring, and the side plates are fixedly connected to the adjacent guide sleeves; Rotating a winding wheel mounted on the outer side wall of the side plate; A rope is wound around the winding wheel, one end of which passes through a through hole on the side plate and is connected to a side wall of the core barrel between two arc-shaped plates. A volute spring is installed between the winding wheel and the side plate, and the force of the volute spring on the winding wheel keeps it in the tendency to reel in the rope.

8. The coalfield geological drilling and coring device according to claim 5, characterized in that: A movable plate is arranged in the core-taking barrel, and a second compression spring is fixedly connected between the upper surface of the movable plate and the top of the inner cavity of the core-taking barrel.

9. The coalfield geological drilling and coring device according to claim 8, characterized in that: A leakage protection structure is installed in the coring barrel, and the leakage protection structure includes: An arc-shaped elastic sheet installed at the bottom of each arc-shaped plate, the arc top of the arc-shaped elastic sheet is close to the inner cavity of the core barrel, spikes are arranged on the inner side wall of the arc-shaped elastic sheet, and the bottom end of the arc-shaped elastic sheet is hinged to the arc-shaped plate; A transmission rod is hinged at the top of the arc-shaped elastic sheet, and the transmission rod is vertically movable in the arc-shaped plate; A driving rod is hinged on the top of the transmission rod. One end of the driving rod away from the transmission rod extends obliquely downward to above the movable plate. A through slot is provided on the driving rod. A pin is passed through the through slot. The pin is fixedly connected to the arc plate.

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