A variable frequency electric drive top drive core drill for geological coring exploration

Abstract

The present invention discloses a variable frequency electric drive top drive core drill for geological coring exploration, which relates to the field of drilling tool technology. The drill comprises: a fixed support, on which a mud tank is mounted, the liquid outlet of the mud tank being connected to a hollow flow channel in a drill pipe via a delivery hose; a lifting support frame, on which a variable frequency drive motor is connected, which can move up and down along the lifting support frame, the output shaft of the variable frequency drive motor being connected to a rotating rod, the end of the rotating rod away from the variable frequency drive motor being connected to the drill pipe; a pressing device, which is fixed to the lifting support frame, and the telescopic end of the pressing device can push the rotating rod downward; a mud processing device, wherein the mixture inlet of the mud processing device is connected to the borehole via an overflow pipe, a conveyor is provided below the solid outlet of the mud processing device, and the liquid outlet of the mud processing device is connected to the liquid inlet of the mud tank via a return pipe. The present invention optimizes the injection and recovery system of drilling fluid.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a variable frequency electric drive top drive core drilling rig used for geological coring exploration. Background Art

[0002] The variable frequency electric drive top drive core drill rig is an advanced geological exploration device specifically designed for coring deep strata. This rig integrates modern power electronics, mechanical manufacturing, hydraulic control, electronic information technology, and modular design concepts. Its core feature is the use of AC variable frequency electric drive technology to control each of the rig's key operating components.

[0003] The variable frequency electric drive can achieve precise speed and torque control, allowing the drill rig to maintain an efficient drilling speed under different geological conditions, while adapting to the different process requirements of high-speed top drive coring and high-torque rotary table drilling.

[0004] Compared to traditional diesel-powered drilling rigs, electric drive systems utilize energy more efficiently, reducing energy consumption and operating costs while also reducing noise and environmental pollution. They are suitable for deep-hole core drilling up to 4,500 meters, and are particularly well-suited for mineral resource exploration, geothermal well drilling, coalbed methane, and shale gas exploration.

[0005] Chinese patent application number 201310732037.9 discloses a variable-frequency electric-driven top-drive core drilling rig for geological coring exploration. The rig comprises a platform and a vertical derrick mounted on the platform. The platform is equipped with an electric-driven winch and a fishing winch for retracting and releasing the rope. An electric-driven turntable is also located on the platform below the derrick. The derrick is equipped with guide rails parallel to the derrick, which are connected to the top drive via a bracket pulley. The top drive utilizes a top-drive variable-frequency motor directly connected to the drill pipe via a connecting shaft. The motors for the top drive, electric-driven winch, fishing winch, and electric-driven turntable are driven by a frequency converter in the electrical control room, controlled by the driller's cabin. The rig also features an engineer's cabin for monitoring drilling operations. A rope tension and speed detection device is located at the top of the derrick. The rig is driven by an AC variable-frequency motor for slewing, hoisting, feeding, and fishing operations. It features long-travel guide rails and rope speed and tension detection. Controlled by a frequency converter, the rig achieves efficient and energy-efficient drilling.

[0006] Existing core drilling rigs have difficulty in effectively injecting and recovering drilling fluid during use, which may have the following adverse effects:

[0007] Reduced drilling efficiency: Insufficient injection of drilling fluid will lead to poor cooling of the drill bit, making it difficult to effectively remove drill cuttings, thereby increasing drilling resistance and reducing drilling speed.

[0008] Increased wear of drill tools: Lack of sufficient drilling fluid circulation will reduce the lubrication of the drill tools, increase the friction between the drill tools and the well wall, cause premature wear of the drill bit and other drill tool components, and shorten their service life.

[0009] Wellbore stability is affected: Drilling fluid plays a crucial role in stabilizing the wellbore and preventing collapse. If drilling fluid injection is poor, an effective pressure balance cannot be achieved on the wellbore, potentially leading to wellbore collapse or an increase in wellbore diameter, compromising drilling quality and safety.

[0010] Damaged core quality: Poor drilling fluid circulation will prevent cuttings from being carried out of the well in a timely manner, which may cause core blockage or contamination, affecting subsequent core analysis and geological judgment.

[0011] Increased safety hazards: Poor circulation of drilling fluid may cause pressure imbalance in the well, increase the risk of well kick and blowout, and in severe cases even threaten the safety of operators.

[0012] Environmental issues: Failure to effectively recover drilling fluid may cause ground environmental pollution, especially leakage of drilling fluid containing harmful chemicals, which poses a threat to the surrounding environment and ecosystem.

[0013] Increased costs: Frequent replacement of drill tools damaged by accelerated wear, handling of ground contamination, and possible accident response and aftermath will lead to significant increase in operating costs.

[0014] From the above shortcomings, it can be seen that optimizing the injection and recovery system of drilling fluid and ensuring its smooth and efficient operation are crucial to ensuring the smooth progress of core drilling work, improving drilling efficiency, protecting the environment and reducing costs.

[0015] Therefore, there is an urgent need in the art for a new type of variable frequency electric drive top drive core drill for geological coring exploration to solve the above problems. Summary of the Invention

[0016] The purpose of the present invention is to provide a variable frequency electric drive top drive core drilling rig for geological coring exploration, so as to solve the problems existing in the above-mentioned prior art, optimize the injection and recovery system of drilling fluid, and its operation is smooth and efficient, with the advantages of ensuring the smooth progress of core drilling work, improving drilling efficiency, protecting the environment and reducing costs.

[0017] To achieve the above object, the present invention provides the following solutions:

[0018] The present invention discloses a variable frequency electric drive top drive core drilling rig for geological coring exploration, comprising:

[0019] A fixed bracket, on which a mud tank is mounted, wherein a liquid outlet of the mud tank is connectable to a hollow flow channel in the drill pipe via a delivery hose;

[0020] A lifting support frame, wherein the lifting support frame is connected to a variable frequency drive motor, the variable frequency drive motor can move up and down along the lifting support frame, the output shaft of the variable frequency drive motor is connected to a rotating rod, and the end of the rotating rod away from the variable frequency drive motor is used to connect to the drill rod;

[0021] A downward pressing device, the downward pressing device is fixed to the lifting support frame, and the telescopic end of the downward pressing device can push the rotating rod downward;

[0022] Mud processing equipment, the mixture inlet of the mud processing equipment is connected to the borehole through an overflow pipe, a conveyor is provided below the solid outlet of the mud processing equipment, and the liquid outlet of the mud processing equipment is connected to the liquid inlet of the mud tank through a return pipe.

[0023] Preferably, a winch is further included, and one end of the wire rope of the winch away from the winch is connected to the variable frequency drive motor.

[0024] Preferably, the steel wire rope of the hoist is connected to a motor sliding bracket, the motor sliding bracket is slidably connected to the lifting support frame, and the variable frequency drive motor is fixed on the motor sliding bracket.

[0025] Preferably, a plurality of guide wheels are provided at the upper end of the lifting support frame, and the wire rope of the winch passes around each of the guide wheels in sequence.

[0026] Preferably, the pressing device comprises a pressing hydraulic cylinder, the fixed end of the pressing hydraulic cylinder is fixed to the lifting support frame, and the telescopic end of the pressing hydraulic cylinder is fixed with a sliding pressing seat;

[0027] The outer side of the rotating rod is provided with a clamping sleeve, the outer side wall of the clamping sleeve is provided with an annular clamping groove, and the end of the sliding pressing seat away from the pressing hydraulic cylinder is clamped in the clamping groove.

[0028] Preferably, the outer side of the drill pipe is provided with a liquid outlet ring, the end of the delivery hose away from the mud tank is connected to the liquid outlet ring, the side wall of the drill pipe is provided with a mud injection hole, an annular chamber is provided in the liquid outlet casing, a movable piston is slidably connected in the annular chamber, a nozzle is provided on the movable piston, a return spring is connected between the movable piston and the outer side wall of the annular chamber, a one-way structure is provided on the inner side of the mud injection hole, and the one-way structure is located in the hollow flow channel.

[0029] Preferably, the one-way structure includes a one-way ring body, a one-way petal is provided in the one-way ring body, and the one-way ring body and the one-way petal are connected by an elastic sheet.

[0030] Preferably, the one-way flap is made of rubber.

[0031] Preferably, the return pipe is provided with a first mud pump, the overflow pipe is provided with a second mud pump, and the delivery hose is provided with a third mud pump.

[0032] Preferably, the mud processing equipment includes a vibrating screen, a desilter and a centrifugal separator arranged in sequence, the liquid inlet end of the vibrating screen is connected to the liquid outlet end of the overflow pipe, the liquid outlet end of the vibrating screen is connected to the liquid inlet end of the desilter, the liquid outlet end of the desilter is connected to the liquid inlet end of the centrifugal separator, and the solid impurities separated from the vibrating screen, the desilter and the centrifugal separator all flow out from the solid outlet.

[0033] Compared with the prior art, the present invention has achieved the following technical effects:

[0034] During use, the present invention can transport drilling fluid from the mud tank into the drill pipe, and the mud overflowing from the overflow port at the upper end of the borehole can flow back to the mud treatment equipment through the overflow pipe. After being processed by the mud treatment equipment, the separated liquid is transported back to the mud tank as drilling fluid, while the solid waste is transported by a conveyor to a solid waste collection site. This forms a circulation system for effectively injecting and recycling drilling fluid, which will bring many benefits, as follows:

[0035] Improve drilling efficiency: Good drilling fluid circulation can ensure that the drill bit is effectively cooled, reduce heat accumulation, carry and discharge drill cuttings, keep the borehole clean, and thus improve drilling speed and efficiency;

[0036] Extend the life of drilling tools: The lubricating effect of drilling fluid can significantly reduce the friction between drilling tools and rocks, reduce wear, extend the service life of drilling tools such as drill bits and drill pipes, reduce replacement frequency, and save costs;

[0037] Enhance wellbore stability: Continuously injected drilling fluid can form liquid column pressure to support the wellbore wall and prevent collapse, which is particularly important when drilling in soft or unstable formations;

[0038] Improve core quality: The rational use of drilling fluid can prevent core contamination by drilling fluid, reduce core breakage and blockage, ensure the integrity and purity of the extracted core, and improve the accuracy of geological analysis;

[0039] Environmentally friendly: By recycling drilling fluid, the preparation of new drilling fluid and the discharge of waste drilling fluid are reduced, which reduces the impact on the environment and conforms to the concept of green drilling;

[0040] Cost control: The recycling of drilling fluid reduces drilling fluid consumption and treatment costs, while also reducing maintenance costs caused by equipment wear and failure, which is generally beneficial to improving the economic efficiency of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a schematic structural diagram of a variable frequency electric drive top drive core drill for geological coring exploration according to an embodiment of the present invention;

[0043] Figure 2 This is a diagram showing the internal structure of a fluid outlet collar in a variable frequency electric drive top drive core drill for geological coring exploration according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic structural diagram of a unidirectional structure in a variable frequency electric drive top drive core drill for geological coring exploration according to an embodiment of the present invention;

[0045] Figure 4 This is a front view of a fluid outlet collar in a variable frequency electric drive top drive core drill for geological coring exploration according to an embodiment of the present invention;

[0046] Figure 5 Schematic diagram of the internal structure of a mud processing device in a variable frequency electric drive top drive core drilling rig for geological coring exploration according to an embodiment of the present invention;

[0047] In the figure: 1-fixed bracket; 2-lifting support frame; 3-frequency drive motor; 4-mud processing equipment; 5-conveyor; 6-first mud pump; 7-second mud pump; 8-third mud pump; 9-rotating rod; 10-drill pipe; 11-down-pressure hydraulic cylinder; 12-sliding down-pressure seat; 13-clamping sleeve; 14-winch; 15-guide wheel; 16-medicament adding tank; 17-delivery hose; 18-liquid outlet collar; 19-moving piston; 20-return spring; 21-mud injection hole; 22-hollow flow channel; 23-one-way structure; 24-one-way ring body; 25-one-way flap; 26-elastic sheet; 27-vibrating screen; 28-desilter; 29-centrifuge; 30-mud tank; 31-nozzle. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] The purpose of the present invention is to provide a variable frequency electric drive top drive core drilling rig for geological coring exploration, so as to solve the problems existing in the above-mentioned prior art, optimize the injection and recovery system of drilling fluid, and its operation is smooth and efficient, with the advantages of ensuring the smooth progress of core drilling work, improving drilling efficiency, protecting the environment and reducing costs.

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figure 1-Figure 5 As shown, this embodiment provides a variable frequency electric drive top drive core drilling rig for geological coring exploration, including the following structure:

[0052] The fixed bracket 1 is a vertical frame structure. A mud tank 30 is installed on the fixed bracket 1. The liquid outlet of the mud tank 30 can be connected to the hollow flow channel 22 in the drill pipe 10 through the delivery hose 17, so that the drilling fluid in the mud tank 30 can be delivered to the hollow flow channel 22 located in the center of the drill pipe 10.

[0053] The lifting support frame 2 is a vertical rod-shaped structure. A variable frequency drive motor 3 is connected to the lifting support frame 2. The variable frequency drive motor 3 can move up and down along the vertical direction of the lifting support frame 2. The output shaft of the variable frequency drive motor 3 is connected to a rotating rod 9. Since the output shaft of the variable frequency drive motor 3 is arranged vertically downward, the output shaft of the variable frequency drive motor 3 is connected to the upper end of the rotating rod 9 via a connecting flange. The end of the rotating rod 9 away from the variable frequency drive motor 3 (i.e., the lower end of the rotating rod 9) is used to connect to the upper end of the drill rod 10. The rotating rod 9 and the drill rod 10 are also flange-connected. The flange connection means that the adjacent ends of the two are provided with corresponding flanges, and the two adjacent flanges are connected by bolts. The lower end of the drill rod 10 is used to connect to a drill bit, and different drill bits can be selected according to different needs.

[0054] The downward pressing device is fixed on the lifting support frame 2. The telescopic end of the downward pressing device can push the rotating rod 9 downward, so that the drill rod 10 can also move downward during the rotation process, thereby achieving the technical purpose of downward drilling.

[0055] The mud treatment equipment 4 has a mixture inlet connected to the overflow port (i.e., orifice) of the borehole through an overflow pipe, so that the overflowed mud can flow back to the mud treatment equipment 4 through the overflow pipe, and then the mud treatment equipment 4 performs solid-liquid separation on the mud. A conveyor 5 is provided below the solid outlet of the mud treatment equipment 4, wherein the conveyor 5 includes but is not limited to the existing belt conveyor 5, and can also be other conveying devices that can be used to transport solid waste. The solid waste after solid-liquid separation will be transported to a predetermined location by the conveyor 5, and the liquid outlet of the mud treatment equipment 4 is connected to the liquid inlet of the mud tank 30 through a return pipe. The liquid after solid-liquid separation is drilling fluid, and the liquid after solid-liquid separation flows back to the mud tank 30 through the return pipe as drilling fluid for standby use.

[0056] In actual use, the drilling fluid in the mud tank 30 is transported to the drill pipe 10, and the mud overflowing from the overflow port at the upper end of the borehole can flow back to the mud treatment equipment 4 through the overflow pipe. After being processed by the mud treatment equipment 4, the separated liquid is the drilling fluid and is transported to the mud tank 30 again, while the solid waste will be transported to the solid waste collection site by the conveyor 5, thereby forming a circulation system for effective injection and recycling of the drilling fluid.

[0057] In this embodiment, to achieve vertical movement of the variable frequency drive motor 3, a hoist 14 is also included. Hoist 14 can be mounted on one side of the lifting support frame 2. A wire rope extending from hoist 14 is connected to the variable frequency drive motor 3 at the end distal from hoist 14. In actual use, the vertical movement of the variable frequency drive motor 3 is controlled by controlling the retraction and extension of the wire rope. Specifically, when the wire rope extends, the variable frequency drive motor 3 moves downward; when the wire rope retracts, the variable frequency drive motor 3 moves upward.

[0058] In this embodiment, the wire rope of the hoist 14 is connected to a motor sliding bracket, which is slidably connected to the lifting support frame 2. To reduce the sliding friction between the motor sliding bracket and the lifting support frame 2, a pulley can be provided on the motor sliding bracket, and a corresponding slide groove can be provided on the lifting support frame 2, so that the pulley rolls up and down within the slide groove. This can not only reduce the friction between the motor sliding bracket and the lifting support frame 2, but also limit the position of the motor sliding bracket so that it can only move vertically up and down. The variable frequency drive motor 3 is fixed to the motor sliding bracket by screws, and ultimately the variable frequency drive motor 3 is driven by the wire rope of the hoist 14 and moves vertically up and down along the lifting support frame 2.

[0059] In this embodiment, a plurality of guide wheels 15 are provided at the upper end of the lifting support frame 2, specifically two guide wheels 15. The wire rope of the winch 14 passes around each guide wheel 15 in turn, thereby guiding the wire rope.

[0060] In this embodiment, the pressing device includes a pressing hydraulic cylinder 11, which is vertically arranged. The fixed end located above the pressing hydraulic cylinder 11 is fixed to the lifting support frame 2, and the telescopic end located below the pressing hydraulic cylinder 11 is fixedly connected to a sliding pressing seat 12, which is also slidably connected to the lifting support frame 2. Furthermore, in order to avoid excessive friction between the sliding pressing seat 12 and the lifting support frame 2, a pulley can be provided on the sliding pressing seat 12, and a corresponding slide groove can be provided on the lifting support frame 2, so that the friction between the two is converted into rolling friction.

[0061] A clamping sleeve 13 is provided on the outer side of the rotating rod 9, and the clamping sleeve 13 and the rotating rod 9 are connected by a bearing to achieve relative rotation between the two. An annular clamping groove is provided in the middle of the outer wall of the clamping sleeve 13. The end of the sliding lower pressing seat 12 away from the pressing hydraulic cylinder 11 can be an arc-shaped clamping portion, and two clamping portions can be provided, and the two clamping portions are respectively clamped on both sides of the clamping groove, so that the end of the sliding lower pressing seat 12 away from the pressing hydraulic cylinder 11 can be clamped into the clamping groove.

[0062] When the downward hydraulic cylinder 11 is extended, the telescopic end of the downward hydraulic cylinder 11 will drive the clamping sleeve 13 and the rotating rod 9 to move downward through the sliding downward pressing seat 12; when the downward hydraulic cylinder 11 is shortened, the telescopic end of the downward hydraulic cylinder 11 will drive the clamping sleeve 13 and the rotating rod 9 to move upward through the sliding downward pressing seat 12.

[0063] In this embodiment, if Figure 2 As shown, the outer side of the drill pipe 10 is provided with a liquid outlet collar 18, and the end of the delivery hose 17 away from the mud tank 30 is connected to the liquid outlet collar 18. A plurality of mud injection holes 21 are provided on the side wall of the drill pipe 10, and an annular chamber is provided in the middle interlayer of the liquid outlet sleeve. A movable piston 19 is slidably connected in the annular chamber, and a nozzle 31 is provided on the movable piston 19. The movable piston 19 is in contact with the outer side wall of the annular chamber (the outer side wall here is the inner side wall of the annular chamber). Figure 2 Several return springs 20 are connected between the left side wall of the middle annular chamber. A one-way structure 23 is provided inside the mud injection hole 21. The one-way structure 23 is located within the hollow flow channel 22. The one-way structure 23 allows the drilling fluid in the annular chamber to flow only into the hollow flow channel 22, preventing the drilling fluid in the hollow flow channel 22 from flowing back.

[0064] In actual use, drilling fluid from delivery hose 17 first enters the annular chamber. As the drilling fluid in the annular chamber continues to increase, it pushes movable piston 19 inward until the nozzle of nozzle 31 coincides with mud injection hole 21. At this point, the drilling fluid in the annular chamber is injected into hollow flow channel 22 through nozzle 31, mud injection hole 21, and one-way structure 23, and ultimately flows into drill pipe 10 and the drill bit.

[0065] In this embodiment, for the specific structure of the one-way structure 23, those skilled in the art can fully adopt existing one-way valves and other structures. Figure 3 As shown, the one-way structure 23 includes a circular one-way ring body 24, in which a one-way petal 25 is provided. The one-way petal 25 is umbrella-shaped (can also be seen as conical), and the one-way ring body 24 and the one-way petal 25 are connected by an elastic sheet 26.

[0066] When drilling fluid is blown toward the one-way flap 25, the one-way flap 25 is blown open, the elastic sheet 26 is compressed, and the drilling fluid flows into the hollow flow channel 22 through the gap between the deformed one-way flap 25 and the one-way ring 24. When no drilling fluid passes through, the elastic sheet 26 returns to its original position and supports the one-way flap 25, preventing the liquid in the hollow flow channel 22 from flowing back.

[0067] In this embodiment, the one-way flap 25 is made of a deformable material, specifically rubber, while the elastic piece 26 can be made of an existing elastic metal, including but not limited to spring steel.

[0068] In this embodiment, a first mud pump 6 is provided on the return pipe, a second mud pump 7 is provided on the overflow pipe, and a third mud pump 8 is provided on the delivery hose 17. The first mud pump 6, the second mud pump 7 and the third mud pump 8 can provide delivery power for the return pipe, the overflow pipe and the delivery hose 17.

[0069] Furthermore, a controller can be added, and the controller can be an existing PLC controller or a single-chip microcomputer controller, etc. The above-mentioned electric winch 14 (electric model), variable frequency drive motor 3, first mud pump 6, second mud pump 7 and third mud pump 8 and other electronic control devices can be electrically connected to the controller to achieve remote control by staff.

[0070] In this embodiment, the mud processing equipment 4 includes a vibrating screen 27, a desilter 28, and a centrifuge 29, which are arranged in sequence. Specifically, the liquid inlet of the vibrating screen 27 is connected to the liquid outlet of the overflow pipe. The mixed mud flowing into the mud processing equipment 4 first passes through the vibrating screen 27, where large solid impurities are retained on the vibrating screen 27 and transported to the solids outlet, while the liquid passes through the vibrating screen 27 and flows to the desilter 28. The liquid outlet of the vibrating screen 27 is connected to the liquid inlet of the desilter 28. The desilter 28 can adopt an existing desilting cyclone to further separate the solids and liquids. Small solid particles are transported to the solids outlet, while the liquid is transported to the centrifuge 29. The liquid outlet of desilter 28 is connected to the liquid inlet of centrifuge 29. Centrifuge 29 can be any type of centrifuge capable of solid-liquid separation. The solids after centrifugal separation are ultimately conveyed to the solids outlet, and the liquid flows back into the mud tank 30 through a return pipe. The solid impurities separated by vibrating screen 27, desilter 28, and centrifuge 29 ultimately flow out of the solids outlet and fall onto conveyor 5. Of course, the mud processing equipment 4 can also utilize other existing types of solid-liquid separation equipment and is not limited to this type.

[0071] In addition, the liquid outlet or return pipe of the centrifuge 29 is connected to a reagent adding tank 16 for adding reagents to the liquid to modify it into a suitable drilling fluid to meet the use requirements of different environments.

[0072] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A variable frequency electric drive top drive core drilling rig for geological coring exploration, characterized in that: include: A fixed bracket, on which a mud tank is mounted, wherein a liquid outlet of the mud tank is connectable to a hollow flow channel in the drill pipe via a delivery hose; A lifting support frame, wherein the lifting support frame is connected to a variable frequency drive motor, the variable frequency drive motor can move up and down along the lifting support frame, the output shaft of the variable frequency drive motor is connected to a rotating rod, and the end of the rotating rod away from the variable frequency drive motor is used to connect to the drill rod; A downward pressing device, the downward pressing device is fixed to the lifting support frame, and the telescopic end of the downward pressing device can push the rotating rod downward; A mud processing device, wherein the mixture inlet of the mud processing device is connected to the borehole through an overflow pipe, a conveyor is provided below the solid outlet of the mud processing device, and the liquid outlet of the mud processing device is connected to the liquid inlet of the mud tank through a return pipe; The outer side of the drill pipe is provided with a liquid outlet collar, and one end of the delivery hose away from the mud tank is connected to the liquid outlet collar, a mud injection hole is provided on the side wall of the drill pipe, an annular chamber is provided in the liquid outlet collar, a movable piston is slidably connected in the annular chamber, a nozzle is provided on the movable piston, a return spring is connected between the movable piston and the outer side wall of the annular chamber, a one-way structure is provided on the inner side of the mud injection hole, and the one-way structure is located in the hollow flow channel; the one-way structure includes a one-way ring body, a one-way valve is provided in the one-way ring body, and the one-way ring body and the one-way valve are connected by an elastic sheet; It also includes a hoist, wherein one end of the hoist's wire rope away from the hoist is connected to the variable frequency drive motor; the hoist's wire rope is connected to a motor sliding bracket, the motor sliding bracket is slidably connected to the lifting support frame, and the variable frequency drive motor is fixed to the motor sliding bracket; The downward pressing device includes a downward pressing hydraulic cylinder, the fixed end of the downward pressing hydraulic cylinder is fixed on the lifting support frame, and the telescopic end of the downward pressing hydraulic cylinder is fixed with a sliding downward pressing seat; the outer side of the rotating rod is connected to a clamping sleeve through a bearing, and an annular clamping groove is provided on the outer side wall of the clamping sleeve, and the end of the sliding downward pressing seat away from the downward pressing hydraulic cylinder is clamped in the clamping groove.

2. The variable frequency electric drive top drive core drilling rig for geological coring exploration according to claim 1, characterized in that: A plurality of guide wheels are provided at the upper end of the lifting support frame, and the steel wire rope of the hoist passes around each of the guide wheels in sequence.

3. The variable frequency electric drive top drive core drilling rig for geological coring exploration according to claim 1, characterized in that: The one-way flap is made of rubber.

4. The variable frequency electric drive top drive core drilling rig for geological coring exploration according to claim 1, characterized in that: The return pipe is provided with a first mud pump, the overflow pipe is provided with a second mud pump, and the delivery hose is provided with a third mud pump.

5. The variable frequency electric drive top drive core drilling rig for geological coring exploration according to claim 1, characterized in that: The mud processing equipment includes a vibrating screen, a desilter and a centrifugal separator arranged in sequence. The liquid inlet end of the vibrating screen is connected to the liquid outlet end of the overflow pipe, the liquid outlet end of the vibrating screen is connected to the liquid inlet end of the desilter, and the liquid outlet end of the desilter is connected to the liquid inlet end of the centrifugal separator. The solid impurities separated by the vibrating screen, the desilter and the centrifugal separator all flow out from the solid outlet.

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