A tracked reverse circulation drilling rig

Abstract

This invention discloses a tracked reverse circulation drilling rig, relating to the field of drilling equipment technology. Specifically, it includes a tracked vehicle body with a support frame on one side. A lifting structure is located at the top of the support frame, and a drilling structure is connected to the output shaft of the lifting structure. The drilling structure includes a one-way valve connected to the output shaft of the lifting structure and a slag discharge pipe connected to the outlet of the one-way valve. This application utilizes a discharge assembly to promptly discharge residual drilling slurry from the one-way valve, preventing slurry accumulation and reducing the risk of slurry blockage in the one-way valve's flow channel, thus extending the valve's service life. Furthermore, after the slurry is discharged from the one-way valve, a rotating cleaning scraper cleans the inner wall of the valve body and the bottom of the plunger, preventing the plunger from adhering to the inner wall of the valve body, ensuring the plunger's flexibility, and preventing impurities from adhering to the bottom of the plunger, which would narrow the slag discharge channel within the valve body.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, specifically to a tracked reverse circulation drilling rig. Background Technology

[0002] Tracked reverse circulation drilling rigs are core equipment in fields such as pile foundation engineering, water conservancy well construction, and mining exploration. They are mainly used for drilling operations under complex geological conditions (such as gravel layers, weathered rock, and loose sand layers). With the rapid development of national infrastructure construction (such as high-speed railway bridges and cross-sea projects) and agricultural irrigation facilities, the market has placed higher demands on drilling rigs' adaptability to geological formations (the need to penetrate hard strata such as gravel and bedrock), construction efficiency (single-hole drilling speed), positioning accuracy (ensuring the verticality of pile foundations), and environmental friendliness (reducing mud pollution).

[0003] Currently, the mud circulation direction of tracked reverse circulation drilling rigs involves injecting mud into the wellbore through the wellhead to the bottom of the borehole. After mixing with rock cuttings, a high-pressure circulating flow is formed inside the drill pipe. Due to gravity and pressure difference, the mud carries drilling debris upwards along the drill pipe cavity back to the wellhead. This method of drilling and cuttings removal is highly efficient. However, this cuttings removal method necessitates the installation of a one-way valve at the top of the drill pipe to prevent backflow of the circulating medium and ensure the stable operation of the reverse circulation system. But when the one-way valve begins to close, the flow cross-section of the cuttings removal pipeline... The sudden decrease in volume leads to a sharp drop in slurry flow rate, causing slurry to accumulate in the check valve. The accumulated residue may solidify, clogging the check valve's discharge channel and affecting its operation. Furthermore, in existing tracked reverse circulation drilling rigs, the drilling area is usually concentrated on one side of the vehicle body, causing a lateral shift in the equipment's center of gravity. This shift is exacerbated by the increased drilling depth, where the weight of the drill rod and the pressure of the reverse circulation medium further aggravate the center of gravity shift, resulting in uneven stress on the tracks and increasing the risk of tilting. Based on these considerations, this application proposes a tracked reverse circulation drilling rig. Summary of the Invention

[0004] This invention provides a tracked reverse circulation drilling rig, which solves the problems mentioned in the background art, such as the sudden reduction in the flow cross-sectional area of ​​the slag discharge pipeline when the one-way valve begins to close, leading to a sharp drop in slag flow rate and easy accumulation of slag in the one-way valve. The accumulated residue may solidify, blocking the slag discharge channel of the one-way valve and affecting its use; and the drilling part of the tracked reverse circulation drilling rig is located on one side of the vehicle body, which easily causes uneven stress on the tracks and is prone to tilting risk.

[0005] This invention provides the following technical solution: a tracked reverse circulation drilling rig, comprising a tracked vehicle body, a support frame provided on one side of the tracked vehicle body, a lifting structure provided at the top of the support frame, a drilling structure connected to the output shaft end of the lifting structure, the drilling structure comprising a one-way valve connected to the output shaft end of the lifting structure, a slag discharge pipe connected to the liquid outlet end of the one-way valve, a rotating pipe movably connected to the liquid inlet end of the one-way valve, a drill rod detachably connected to the bottom of the rotating pipe, and a drill bit connected to the bottom of the drill rod;

[0006] The one-way valve includes a valve body connected to the end of the output shaft of the lifting structure. A liquid outlet port adapted to a slag discharge pipe is provided on one side of the middle of the valve body's internal cavity. A liquid inlet port is provided at the bottom of the valve body's internal cavity. A plunger is movably connected to the internal cavity of the valve body. The plunger is connected to the top of the valve body's internal cavity via a spring. A rotating cleaning scraper is movably connected to the bottom of the plunger. The tip of the rotating cleaning scraper fits against the inner wall of the valve body to clean the deposits on the inner wall of the valve body. A discharge port is provided on one side of the bottom of the valve body's internal cavity. A discharge assembly is provided on the outer side of the discharge port. The discharge assembly includes a sealing tube connected to the valve body. A spiral feeding shaft adapted to the discharge port is movably connected to the inner cavity of the sealing tube. The spiral feeding shaft is connected to the sealing tube via a telescopic rotating structure. A discharge pipe is provided at the bottom of the sealing tube away from the discharge port. An electric ball valve is provided on one side of the discharge pipe.

[0007] Preferably, the tracked vehicle body is provided with an auxiliary support structure, the auxiliary support structure including a movable frame, the movable frame being connected to the tracked vehicle body through a translation structure, a first positioning structure being provided at the bottom of the movable frame near the support frame, a connecting rod being movably connected to the top of the movable frame near the support frame, and a second positioning structure being provided at the bottom of the connecting rod away from the movable frame.

[0008] Preferably, both the first positioning structure and the second positioning structure include a first hydraulic telescopic rod and a positioning insert connected to the end of the output shaft of the first hydraulic telescopic rod.

[0009] Preferably, a displacement sensor is provided on the top of the plunger, a second hydraulic telescopic rod is provided on the top of the valve body cavity, an electromagnet is connected to the output shaft end of the second hydraulic telescopic rod, when the electromagnet is energized, the electromagnet and the top of the plunger are magnetically attracted, and a pressure sensor is provided on the bottom of the plunger.

[0010] Preferably, the outer surface of the plunger is covered with a sealing airbag, and an inflation / deflation pump is provided on the top of the plunger. The sealing airbag is connected to the inflation / deflation pump to realize inflation / deflation.

[0011] Preferably, a scraper ring is fixedly connected to the top of the valve body cavity, the scraper ring is located above the liquid outlet port, and the plunger is movably connected to the inner cavity of the scraper ring.

[0012] Preferably, the telescopic rotation structure includes a third hydraulic telescopic rod connected to the sealing pipe. A first servo motor is connected to the output shaft end of the third hydraulic telescopic rod. A baffle is connected to the output shaft end of the first servo motor. The baffle is connected to the power input end of the screw feed shaft and is located on the side of the discharge pipe away from the one-way valve.

[0013] Preferably, the drilling structure further includes a drive assembly, which is connected to the bottom end of the valve body, and the rotating tube is driven by the drive assembly to achieve rotational movement.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This tracked reverse circulation drilling rig uses a discharge assembly to promptly discharge residual drilling slurry from the check valve, preventing slurry accumulation and reducing the risk of blockage in the check valve's flow channel. This extends the check valve's service life. After the check valve residue is discharged, a rotating cleaning scraper cleans the inner wall of the valve body and the bottom of the plunger, preventing the plunger from adhering to the inner wall of the valve body, ensuring the plunger's flexibility, and preventing impurities from adhering to the bottom of the plunger, which would narrow the slurry discharge channel inside the valve body.

[0016] 2. This tracked reverse circulation drilling rig, through the setting of auxiliary support structure, increases the contact area between the tracked vehicle body and the ground, adjusts the center of gravity distribution of the tracked vehicle body, improves the stability of the tracked vehicle body, and the position of the second positioning structure can be adjusted according to needs, improving the adaptability of the auxiliary support structure. Attached Figure Description

[0017] Figure 1 This is a front view of a tracked reverse circulation drilling rig proposed in this invention;

[0018] Figure 2 The structure of this invention Figure 1 Rear view illustration;

[0019] Figure 3 The structure of this invention Figure 1 Diagram showing the view from below;

[0020] Figure 4 This is a schematic diagram of the one-way valve structure of the present invention;

[0021] Figure 5 This is a schematic cross-sectional view of the one-way valve structure of the present invention;

[0022] Figure 6 This is a bottom view of the plunger structure of the present invention;

[0023] Figure 7 This is a schematic cross-sectional view of the sealing tube structure of the present invention.

[0024] In the diagram: 1. Tracked vehicle body; 2. Support frame; 3. Lifting structure; 4. Moving frame; 5. Ball screw pair; 6. Fourth servo motor; 7. First hydraulic telescopic rod; 8. Positioning rod; 9. Fifth servo motor; 10. Connecting rod; 11. Valve body; 12. Chain drive structure; 13. Drill rod; 14. Rotating tube; 15. Second servo motor; 16. Fixed housing; 17. Slag discharge pipe; 18. Sealing pipe; 19. Third hydraulic telescopic rod; 20. Second hydraulic telescopic rod; 21. Spring; 22. Air pump; 23. Electromagnet; 24. Displacement sensor; 25. Spiral feed shaft; 26. Baffle; 27. Plunger; 28. Discharge port; 29. ​​First servo motor; 30. Discharge pipe; 31. Pressure sensor; 32. Third servo motor; 33. Rotary cleaning scraper; 34. Sealing airbag; 35. Scraper ring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides one embodiment: Please refer to Figures 1-7 A tracked reverse circulation drilling rig includes a tracked vehicle body 1, a support frame 2 is provided on one side of the tracked vehicle body 1, a lifting structure 3 is provided at the top of the support frame 2, and a drilling structure is connected to the end of the output shaft of the lifting structure 3. In embodiment 1, the lifting structure 3 is a hydraulic telescopic rod. Under the action of the lifting structure 3, the height of the drilling structure can be changed, which facilitates drilling operations using this application.

[0027] The drilling structure includes a one-way valve connected to the end of the output shaft of the lifting structure 3. The one-way valve includes a valve body 11 connected to the end of the output shaft of the lifting structure 3. The valve body 11 is movably connected to the support frame 2, which limits the movement of the valve body 11 and ensures the vertical movement accuracy of the valve body 11. A liquid outlet port is provided on one side of the middle of the inner cavity of the valve body 11, and a slag discharge pipe 17 is provided on the outside of the liquid outlet port. A liquid inlet port is provided at the bottom of the inner cavity of the valve body 11, and a rotating pipe 14 is provided at the bottom of the liquid inlet port. The rotating pipe 14 is movably connected to the one-way valve. The drilling structure also includes a drive assembly connected to the bottom end of the valve body 11. The rotating pipe 14 is driven by the drive assembly to achieve rotational movement. In Embodiment 2, the drive assembly includes a fixed housing 16 connected to the bottom end of the valve body 11. The rotating tube 14 is movably connected to the fixed housing 16. A second servo motor 15 is provided on the side of the fixed housing 16 away from the rotating tube 14. The second servo motor 15 is connected to the rotating tube 14 through a chain drive structure 12 and a coupling. The second servo motor 15 serves as the power source of the drive structure and transmits rotational power to the rotating tube 14 through the chain drive structure 12, thereby achieving stable rotation and precise positioning of the rotating tube 14 and meeting the drill bit rotation requirements during the drilling process of this application.

[0028] The bottom of the rotating tube 14 is detachably connected to the drill rod 13. The drill rod 13 and the rotating tube 14 can be connected by bolts. The bottom of the drill rod 13 is connected to the drill bit. Both the drill rod 13 and the drill bit are provided with slag discharge channels in the middle. When this application is used, the slag generated during the drilling process is discharged through the slag discharge channels, the inner cavity of the rotating tube 14, the inner cavity of the one-way valve, and the slag discharge pipe 17.

[0029] A plunger 27 is movably connected to the inner cavity of the valve body 11. A spring 21 is connected to the top of the plunger 27, and the top of the spring 21 is connected to the top of the inner cavity of the valve body 11. The plunger 27 is connected to the valve body 11 through the spring 21. The top of the plunger 27 is located above the discharge port. When the one-way valve is not in use, the bottom of the plunger 27 is located below the discharge port. When the fluid entering the one-way valve exerts a greater pressure on the plunger 27 than the spring 21 exerts on the plunger 27, the plunger 27 can move upward under the action of the fluid pressure. When the bottom of the plunger 27 is misaligned with the discharge port, the drilling residue can be discharged through the slag discharge pipe 17. When the restriction on the plunger 27 is released, the plunger 27 can be reset under the action of the spring 21's rebound force, thereby sealing the discharge port of the one-way valve.

[0030] Furthermore, a displacement sensor 24 is provided on the top of the plunger 27. The displacement sensor 24 can be used to monitor the displacement of the plunger 27 in real time. Based on the displacement, the controller of this application can determine whether the spring 21 needs to be replaced, thus ensuring the reliability of the one-way valve.

[0031] A pressure sensor 31 is provided at the bottom of the plunger 27. The pressure sensor 31 can be used to monitor the pressure on the plunger 27 in real time. The controller of this application can determine the opening state of the check valve based on the pressure on the plunger 27, and then control the operation of the devices on the check valve. For example, when the pressure on the plunger 27 exceeds or is less than the pressure of the spring 21 on the plunger 27, the plunger 27 will move, and the controller of this application controls the displacement sensor 24 to work.

[0032] A second hydraulic telescopic rod 20 is provided at the top of the inner cavity of the valve body 11. An electromagnet 23 is connected to the end of the output shaft of the second hydraulic telescopic rod 20. When the electromagnet 23 is energized, it is magnetically attracted to the top of the plunger 27. Through the second hydraulic telescopic rod 20, when the controller of this application determines, based on data collected by the displacement sensor 24, that the plunger 27 has not moved to its designated position under the corresponding pressure, the controller controls the second hydraulic telescopic rod 20 to operate. The second hydraulic telescopic rod 20 drives the electromagnet 23 to move until the electromagnet 23 is tightly fitted to the top of the plunger 27. With the electromagnet 23 energized, it is magnetically attracted to the plunger 27. Under this attraction, the extension and retraction of the second hydraulic telescopic rod 20 can precisely control the movement of the plunger 27 until it reaches its designated position, ensuring the reliability of this application. Furthermore, the controller of this application can adjust the opening or closing speed of the check valve according to requirements using the second hydraulic telescopic rod 20 and the electromagnet 23, improving the adaptability of the check valve.

[0033] A scraper ring 35 is fixedly connected to the top of the inner cavity of the valve body 11. The scraper ring 35 is located above the liquid outlet port, and the plunger 27 is movably connected to the inner cavity of the scraper ring 35. When the plunger 27 moves upward, the scraper ring 35 can scrape off the impurities adhering to the plunger 27. In addition, a sealing gasket is provided at the top of the inner cavity of the valve body 11 to increase the sealing between the plunger 27 and the valve body 11, and to prevent liquid from entering the top of the inner cavity of the valve body 11 during the slag discharge process of the one-way valve.

[0034] The outer surface of the plunger 27 is covered with a sealing air bag 34. An air pump 22 is provided on the top of the plunger 27. The sealing air bag 34 is connected to the air pump 22 to realize air filling and emptying. The sealing air bag 34 increases the sealing between the plunger 27 and the liquid inlet end of the valve body 11, improves the reliability of the check valve. Furthermore, when the thickness of the sealing air bag 34 is reduced, the amount of air filling can be dynamically adjusted to compensate for the decrease in sealing performance caused by wear to a certain extent, thus ensuring the reliability of the check valve.

[0035] A rotary cleaning scraper 33 is movably connected to the bottom of the plunger 27. The tip of the rotary cleaning scraper 33 is in contact with the inner wall of the valve body 11 to clean the deposits on the inner wall of the valve body 11. A third servo motor 32 is provided at the top of the plunger 27. The output shaft of the third servo motor 32 is connected to the rotary cleaning scraper 33 through a coupling and a reducer. When the plunger 27 moves down, the controller of this application controls the third servo motor 32 to rotate. The third servo motor 32 drives the rotary cleaning scraper 33 to rotate, cleaning the inner wall of the valve body 11 and the bottom of the plunger 27. This prevents the plunger 27 from sticking to the inner wall of the valve body 11, ensures the flexibility of the plunger 27's movement, and prevents impurities from adhering to the bottom of the plunger 27, which would reduce the size of the slag discharge channel inside the valve body 11.

[0036] A discharge port 28 is provided on one side of the bottom end of the inner cavity of the valve body 11. A discharge assembly is provided on the outer side of the discharge port 28. The discharge assembly includes a sealing tube 18 connected to the valve body 11. A spiral feeding shaft 25 adapted to the discharge port 28 is movably connected to the inner cavity of the sealing tube 18. The spiral feeding shaft 25 is connected to the sealing tube 18 through a telescopic rotation structure. A discharge pipe 30 is provided at the bottom of the end of the sealing tube 18 away from the discharge port 28. An electric ball valve is provided on one side of the discharge pipe 30. The telescopic rotation structure includes a third hydraulic telescopic rod 19 connected to the sealing tube 18. A first servo motor 29 is connected to the end of the output shaft of the third hydraulic telescopic rod 19. A baffle 26 is connected to the end of the output shaft of the first servo motor 29. The baffle 26 is connected to the power input end of the spiral feeding shaft 25. The baffle 26 is located on the side of the discharge pipe 30 away from the check valve.

[0037] With the discharge assembly in place, when the check valve is closed, under the action of the third hydraulic telescopic rod 19, the end of the screw feed shaft 25 away from the third hydraulic telescopic rod 19 extends into the inner cavity of the check valve. When the first servo motor 29 rotates, the first servo motor 29 can drive the screw feed shaft 25 to rotate. The screw feed shaft 25 can discharge the material remaining in the check valve, preventing residue from accumulating in the check valve, extending the service life of the check valve, and facilitating the use of the rotating cleaning scraper 33. At this time, the baffle 26 is still located on the side of the discharge pipe 30 away from the check valve. The baffle 26 is used to shield the drilling residue, preventing the drilling residue from affecting the operation of the first servo motor 29 and the third hydraulic telescopic rod 19.

[0038] An auxiliary support structure is provided on the tracked vehicle body 1. The auxiliary support structure includes a movable frame 4. The movable frame 4 is connected to the tracked vehicle body 1 through a translation structure. The translation structure can be a ball screw pair 5 in the prior art. The movable frame 4 is connected to the tracked vehicle body 1 through the ball screw pair 5. A fourth servo motor 6 is provided on the tracked vehicle body 1. The fourth servo motor 6 drives the ball screw pair 5 to achieve precise linear motion. The ball screw pair 5 drives the movable frame 4 to move linearly.

[0039] A first positioning structure is provided at the bottom of the movable frame 4 near the support frame 2. A connecting rod 10 is movably connected to the top of the movable frame 4 near the support frame 2. A second positioning structure is provided at the bottom of the connecting rod 10 away from the movable frame 4. A fifth servo motor 9 is provided at the end of the movable frame 4 near the support frame 2. The fifth servo motor 9 drives the connecting rod 10 to achieve rotational movement. Both the first and second positioning structures include a first hydraulic telescopic rod 7 and a positioning insert 8 connected to the end of the output shaft of the first hydraulic telescopic rod 7. Under the action of the first hydraulic telescopic rod 7, the positioning insert 8 can be inserted into the ground. By using the first and second positioning structures, the contact area between the tracked vehicle body 1 and the ground is increased, the center of gravity distribution of the tracked vehicle body 1 is adjusted, and the stability of the tracked vehicle body 1 is improved. Furthermore, the position of the second positioning structure can be adjusted according to needs, improving the adaptability of the auxiliary support structure.

[0040] In summary: When using this tracked reverse circulation drilling rig, the user can adjust the positions of the first and second positioning structures as needed, and use the auxiliary support structure to improve the center of gravity distribution of the tracked vehicle body 1, thereby improving the stability of the tracked reverse circulation drilling rig and facilitating drilling operations in this application. When the check valve is closed, the discharge assembly operates. Under the action of the third hydraulic telescopic rod 19, the end of the screw feed shaft 25 away from the third hydraulic telescopic rod 19 extends into the inner cavity of the check valve. When the first servo motor 29 rotates, the first servo motor 29 can drive the screw feed shaft 25 to rotate. Using the screw feed shaft 25, the material remaining in the check valve can be discharged, preventing residue from accumulating in the check valve and extending the service life of the check valve. At this time, the baffle 26 is still located on the side of the discharge pipe 30 away from the check valve. The baffle 26 is used to shield the drilling residue, preventing the drilling residue from affecting the operation of the first servo motor 29 and the third hydraulic telescopic rod 19. After the residue in the check valve is discharged, the third servo motor 32 drives the rotating cleaning scraper 33 to rotate, cleaning the inner wall of the valve body 11 and the bottom of the plunger 27, preventing the plunger 27 from sticking to the inner wall of the valve body 11, ensuring the flexibility of the plunger 27's movement, and preventing impurities from adhering to the bottom of the plunger 27, causing the slag discharge channel in the valve body 11 to shrink.

[0041] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each structure adopt conventional techniques such as bolt connection, which are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The materials of each component can be selected according to requirements and are not limited here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tracked reverse circulation drilling rig, comprising a tracked vehicle body (1), characterized in that: A support frame (2) is provided on one side of the tracked vehicle body (1), and a lifting structure (3) is provided at the top of the support frame (2). A drilling structure is connected to the end of the output shaft of the lifting structure (3). The drilling structure includes a one-way valve connected to the end of the output shaft of the lifting structure (3), a slag discharge pipe (17) connected to the liquid outlet of the one-way valve, a rotating pipe (14) movably connected to the liquid inlet of the one-way valve, a drill rod (13) detachably connected to the bottom of the rotating pipe (14), and a drill bit connected to the bottom of the drill rod (13). The one-way valve includes a valve body (11) connected to the end of the output shaft of the lifting structure (3). A liquid outlet port adapted to the slag discharge pipe (17) is provided on one side of the middle of the inner cavity of the valve body (11). A liquid inlet port is provided at the bottom of the inner cavity of the valve body (11). A plunger (27) is movably connected to the inner cavity of the valve body (11). The plunger (27) is connected to the top of the inner cavity of the valve body (11) via a spring (21). A rotating cleaning scraper (33) is movably connected to the bottom of the plunger (27). The tip of the rotating cleaning scraper (33) fits against the inner wall of the valve body (11) to clean the inner wall of the valve body (11). Clean the wall deposits; a discharge port (28) is provided on one side of the bottom of the inner cavity of the valve body (11), and a discharge assembly is provided on the outside of the discharge port (28). The discharge assembly includes a sealing tube (18) connected to the valve body (11). A spiral feeding shaft (25) adapted to the discharge port (28) is movably connected to the inner cavity of the sealing tube (18). The spiral feeding shaft (25) is connected to the sealing tube (18) through a telescopic rotation structure. A discharge pipe (30) is provided at the bottom of the end of the sealing tube (18) away from the discharge port (28). An electric ball valve is provided on one side of the discharge pipe (30).

2. The tracked reverse circulation drilling rig according to claim 1, characterized in that: An auxiliary support structure is provided on the tracked vehicle body (1). The auxiliary support structure includes a movable frame (4). The movable frame (4) is connected to the tracked vehicle body (1) through a translation structure. A first positioning structure is provided at the bottom of the movable frame (4) near the support frame (2). A connecting rod (10) is movably connected to the top of the movable frame (4) near the support frame (2). A second positioning structure is provided at the bottom of the connecting rod (10) away from the movable frame (4).

3. A tracked reverse circulation drilling rig according to claim 2, characterized in that: Both the first positioning structure and the second positioning structure include a first hydraulic telescopic rod (7) and a positioning insert (8) connected to the end of the output shaft of the first hydraulic telescopic rod (7).

4. A tracked reverse circulation drilling rig according to claim 1, characterized in that: A displacement sensor (24) is provided on the top of the plunger (27), and a second hydraulic telescopic rod (20) is provided on the top of the inner cavity of the valve body (11). An electromagnet (23) is connected to the end of the output shaft of the second hydraulic telescopic rod (20). When the electromagnet (23) is energized, the electromagnet (23) and the top of the plunger (27) are magnetically attracted to each other. A pressure sensor (31) is provided on the bottom of the plunger (27).

5. A tracked reverse circulation drilling rig according to claim 1, characterized in that: The outer surface of the plunger (27) is covered with a sealing airbag (34), and an inflation / deflation pump (22) is provided on the top of the plunger (27). The sealing airbag (34) is connected to the inflation / deflation pump (22) to realize inflation and deflation.

6. A tracked reverse circulation drilling rig according to claim 1, characterized in that: A scraper ring (35) is fixedly connected to the top of the inner cavity of the valve body (11). The scraper ring (35) is located above the liquid outlet port. The plunger (27) is movably connected to the inner cavity of the scraper ring (35).

7. A tracked reverse circulation drilling rig according to claim 1, characterized in that: The telescopic rotation structure includes a third hydraulic telescopic rod (19) connected to the sealing tube (18). The output shaft end of the third hydraulic telescopic rod (19) is connected to a first servo motor (29). The output shaft end of the first servo motor (29) is connected to a baffle (26). The baffle (26) is connected to the power input end of the screw feed shaft (25). The baffle (26) is located on the side of the discharge pipe (30) away from the one-way valve.

8. A tracked reverse circulation drilling rig according to claim 1, characterized in that: The drilling structure also includes a drive assembly, which is connected to the bottom end of the valve body (11), and the rotating tube (14) is driven by the drive assembly to achieve rotational movement.

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