Crawler-type reverse circulation drilling machine

Abstract

The invention discloses a crawler-type reverse circulation drilling machine, and relates to the technical field of drilling equipment, the crawler-type reverse circulation drilling machine specifically comprises a crawler-type vehicle body, one side of the crawler-type vehicle body is provided with a supporting frame, the top end of the supporting frame is provided with a lifting structure, and the tail end of an output shaft of the lifting structure is connected with a well drilling structure; the well drilling structure comprises a one-way valve connected with the tail end of the output shaft of the lifting structure and a slag discharging pipe connected with the liquid outlet end of the one-way valve. Residual drilling slurry in the one-way valve is discharged in time through the discharging assembly, accumulation of the slurry in the one-way valve is avoided, the risk that a flow channel of the one-way valve is blocked by the slurry is reduced, the service life of the one-way valve is prolonged, and after the residues in the one-way valve are discharged, the inner wall of the valve body and the bottom of the plunger are cleaned through the rotary cleaning scraper; bonding of the plunger and the inner wall of the valve body is avoided, movement flexibility of the plunger is guaranteed, and the situation that impurities adhere to the bottom of the plunger, and consequently a deslagging channel in the valve body is shrunk is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a crawler type reverse circulation drilling rig. Background Art

[0002] Crawler reverse circulation drilling rigs are core equipment in pile foundation engineering, water well construction, and mine exploration, primarily used for drilling operations in 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 for their adaptability to formations (penetrating hard formations such as gravel and bedrock), construction efficiency (single-hole drilling speed), positioning accuracy (ensuring pile foundation verticality), and environmental friendliness (reducing mud pollution).

[0003] At present, the mud circulation direction of the crawler reverse circulation drilling rig is to inject the mud pool into the bottom of the borehole through the wellhead, and after mixing with the cuttings, a high-pressure circulation flow is formed in the inner cavity of the drill pipe. Due to the effects of gravity and pressure difference, the mud carries the drilling debris and returns to the wellhead along the inner cavity of the well pipe. Its drilling and slag discharge efficiency is relatively high. This slag discharge method of the reverse circulation drilling rig requires a one-way valve device to be installed on the top of the drill pipe when it is used to prevent the circulating medium from flowing back and ensure the stable operation of the reverse circulation system. However, when the one-way valve begins to close, the flow cross-section of the slag discharge pipeline is The accumulation suddenly decreases, resulting in a sharp drop in the slurry flow rate, and the slurry is prone to accumulation in the one-way valve. The accumulated residue may solidify and block the slag discharge flow channel of the one-way valve, affecting the use of the one-way valve; and when the existing crawler-type reverse circulation drilling rig is in use, the drilling part is usually concentrated on one side of the vehicle body, resulting in a lateral shift of the center of gravity of the equipment. Especially when the drilling depth increases, the weight of the drill pipe and the pressure of the reverse circulation medium further aggravate the center of gravity shift, causing uneven force on the crawler, which is easy to cause the risk of rollover; based on this, the present application proposes a crawler-type reverse circulation drilling rig. Summary of the Invention

[0004] The present invention provides a crawler-type reverse circulation drilling rig, which solves the problem raised in the above-mentioned background technology that when the one-way valve begins to close, the flow cross-sectional area of ​​the slag discharge pipeline suddenly decreases, resulting in a sharp drop in the slurry flow rate, and the slurry is prone to accumulation in the one-way valve. The accumulated residue may solidify and block the slag discharge flow channel of the one-way valve, affecting the use of the one-way valve; the drilling part of the crawler-type reverse circulation drilling rig is arranged on one side of the vehicle body, which may easily cause uneven force on the crawler track and easily cause the risk of rollover.

[0005] The present invention provides the following technical solution: a crawler-type reverse circulation drilling rig, comprising a crawler-type vehicle body, a support frame provided on one side of the crawler-type vehicle body, a lifting structure provided on the top of the support frame, a drilling structure connected to the end of the output shaft of the lifting structure, the drilling structure comprising a one-way valve connected to the end of the output shaft 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] When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior edge of valve gap and sealing load chamber, and burble goes out control valve thereby control is shaved.

[0007] Preferably, an auxiliary support structure is provided on the crawler vehicle body, and the auxiliary support structure includes a mobile frame, and the mobile frame is connected to the crawler vehicle body through a translation structure, and a first positioning structure is provided at the bottom of the mobile frame near one end of the support frame, and a connecting rod is movably connected to the top of the mobile frame near one end of the support frame, and a second positioning structure is provided at the bottom of the connecting rod away from one end of the mobile frame.

[0008] Preferably, the first positioning structure and the second positioning structure both include a first hydraulic telescopic rod and a positioning plug rod 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 inner cavity of the valve body, and an electromagnet is connected to the end of the output shaft of the second hydraulic telescopic rod. When the electromagnet is in an energized state, the electromagnet and the top of the plunger are in a state of magnetic attraction, and a pressure sensor is provided at the bottom of the plunger.

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

[0011] Preferably, a scraper ring is fixedly connected to the top end of the inner cavity of the valve body, 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 rotating structure includes a third hydraulic telescopic rod connected to the sealing tube, the output shaft end of the third hydraulic telescopic rod is connected to the first servo motor, the output shaft end of the first servo motor is connected to a baffle, the baffle is connected to the power input end of the spiral feeding shaft, and the baffle is located on the side of the discharge pipe away from the one-way valve.

[0013] Preferably, the drilling structure further comprises a driving assembly, the driving assembly is connected to the bottom end of the valve body, and the rotating tube is driven by the driving assembly to achieve rotational motion.

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

[0015] 1. The crawler-type reverse circulation drilling rig uses a discharge assembly to promptly discharge the residual drilling slurry in the one-way valve to avoid slurry accumulation in the one-way valve, reduce the risk of slurry clogging the one-way valve flow channel, and extend the service life of the one-way valve. After the one-way valve residue is discharged, a rotating cleaning scraper is used to clean the inner wall of the valve body and the bottom of the plunger to avoid adhesion between the plunger and the inner wall of the valve body, ensure the flexibility of the plunger movement, and prevent impurities from adhering to the bottom of the plunger, which would cause the slag discharge channel in the valve body to shrink.

[0016] 2. The crawler-type reverse circulation drilling rig increases the contact area between the crawler body and the ground through the setting of the auxiliary support structure, adjusts the center of gravity distribution of the crawler body, and improves the stability of the crawler body. In addition, the position of the second positioning structure can be adjusted according to needs, thereby improving the adaptability of the auxiliary support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front schematic diagram of a crawler-type reverse circulation drilling rig proposed by the present invention;

[0018] Figure 2 The structure of the present invention Figure 1 Schematic diagram on the back;

[0019] Figure 3 The structure of the present invention Figure 1 Schematic diagram looking up;

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

[0021] Figure 5 This is a cross-sectional schematic diagram 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 It is a cross-sectional schematic diagram of the structural sealing tube of the present invention.

[0024] In the figure: 1. crawler 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 transmission structure; 13. drill rod; 14. rotating tube; 15. second servo motor; 16. fixed shell; 17. slag discharge pipe; 18. sealing tube; 19. third hydraulic telescopic rod; 20. second hydraulic telescopic rod; 21. spring; 22. charging and discharging 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 DESCRIPTION

[0025] 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.

[0026] The present invention provides an embodiment: please refer to Figure 1-Figure 7 A crawler reverse circulation drilling rig includes a crawler body 1, a support frame 2 is provided on one side of the crawler body 1, a lifting structure 3 is provided on the top of the support frame 2, and the end of the output shaft of the lifting structure 3 is connected to the drilling structure. 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 is convenient for 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 in a state of active connection with the support frame 2. The support frame 2 is used to limit the valve body 11 to ensure the vertical movement accuracy of the valve body 11. A liquid outlet port is provided on one side of the central part of the inner cavity of the valve body 11, and a slag discharge pipe 17 is provided on the outer side 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 tube 14 is provided at the bottom of the liquid inlet port. The rotating tube 14 is in a state of active connection with the one-way valve. The drilling structure also includes a drive assembly connected to the bottom end of the valve body 11. The rotating tube 14 is driven by the drive assembly to achieve rotational motion. In Example 2, the drive assembly includes a fixed shell 16 connected to the bottom end of the valve body 11, the rotating tube 14 and the fixed shell 16 are in an movably connected state, and a second servo motor 15 is provided on the side of the fixed shell 16 away from the rotating tube 14. The second servo motor 15 and the rotating tube 14 are connected through a chain transmission structure 12 and a coupling. The second servo motor 15 serves as the power source of the drive structure, and transmits the rotational power to the rotating tube 14 through the chain transmission structure 12, thereby realizing stable rotation and precise positioning of the rotating tube 14, thereby 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, and 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, and the middle of the drill rod 13 and the drill bit are provided with slag discharge channels. When the present application is in use, the slag generated during the drilling process is discharged through the slag discharge channel, the inner cavity of the rotating tube 14, the inner cavity of the one-way valve and the slag discharge pipe 17.

[0029] The inner cavity of the valve body 11 is movably connected with a plunger 27, and the top of the plunger 27 is connected to a spring 21. The top of the spring 21 is connected to the top of the inner cavity of the valve body 11, and 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 end of the plunger 27 is located below the discharge port. Using the plunger, when the present application is in use, when the squeezing force of the fluid entering the one-way valve on the plunger 27 is greater than the squeezing force of the spring 21 on the plunger 27, the plunger 27 can be moved upward under the action of the fluid squeezing force. When the bottom of the plunger 27 is in a staggered state with the discharge port, the drilling residue can be discharged through the discharge pipe 17. When the restriction on the plunger 27 is released, the plunger 27 can be reset under the action of the rebound force of the spring 21, thereby sealing the discharge port of the one-way valve.

[0030] In addition, a displacement sensor 24 is provided on the top of the plunger 27. The displacement of the plunger 27 can be monitored in real time using the displacement sensor 24. The controller of the present application can determine whether the spring 21 needs to be replaced based on the displacement, thereby 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 the present application can determine the opening state of the one-way valve based on the pressure on the plunger 27, and then control the operation of the devices on the one-way 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 the present application controls the operation of the displacement sensor 24.

[0032] A second hydraulic telescopic rod 20 is provided at the top of the inner cavity of the valve body 11. The end of the output shaft of the second hydraulic telescopic rod 20 is connected to an electromagnet 23. When the electromagnet 23 is energized, the electromagnet 23 and the top of the plunger 27 are in a state of magnetic attraction. Through the configuration of the second hydraulic telescopic rod 20, when the controller of the present application determines based on the data collected by the displacement sensor 24 that the plunger 27 has not moved into place under the corresponding pressure, the controller controls the second hydraulic telescopic rod 20 to operate, and the second hydraulic telescopic rod 20 drives the electromagnet 23 to move until the electromagnet 23 and the top of the plunger 27 are tightly fitted. When the electromagnet 23 is energized, the electromagnet 23 and the plunger 27 are in a state of magnetic attraction. Under the action of this suction, the extension and retraction of the second hydraulic telescopic rod 20 can accurately control the movement of the plunger 27 until the plunger 27 is in place, ensuring the reliability of the present application. In addition, the controller of the present application uses the second hydraulic telescopic rod 20 and the electromagnet 23 to adjust the opening or closing speed of the one-way valve according to demand, thereby improving the adaptability of the one-way 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 impurities adhering to the plunger 27. A sealing gasket is also provided at the top of the inner cavity of the valve body 11 to enhance the sealing between the plunger 27 and the valve body 11, preventing liquid from entering the top of the inner cavity of the valve body 11 during the use of the one-way valve during the slag discharge process.

[0034] The outer surface of the plunger 27 is wrapped with a sealing airbag 34, and an inflation and deflation air pump 22 is provided on the top of the plunger 27. The sealing airbag 34 is connected to the inflation and deflation air pump 22 to realize inflation and deflation. The sealing airbag 34 is used to increase the sealing between the plunger 27 and the liquid inlet end of the valve body 11, thereby improving the reliability of the one-way valve. When the thickness of the sealing airbag 34 is reduced, the dynamic adjustment of its inflation volume can compensate for the decline in sealing performance caused by wear to a certain extent, thereby ensuring the reliability of the one-way valve.

[0035] The bottom of the plunger 27 is movably connected with a rotating cleaning scraper 33, and the tip of the rotating cleaning scraper 33 is in contact with the inner wall of the valve body 11 to clean the attachments on the inner wall of the valve body 11. A third servo motor 32 is provided on the top of the plunger 27, and the end of the output shaft of the third servo motor 32 is connected to the rotating cleaning scraper 33 through a coupling and a reducer. When the plunger 27 moves downward, the controller of the present application controls the third servo motor 32 to rotate, and the third servo motor 32 drives the rotating cleaning scraper 33 to rotate to clean the inner wall of the valve body 11 and the bottom of the plunger 27, so as to avoid the plunger 27 from sticking to the inner wall of the valve body 11, ensure the flexibility of the movement of the plunger 27, and avoid impurities adhering to the bottom of the plunger 27, causing the slag discharge channel in the valve body 11 to shrink.

[0036] A discharge port 28 is provided on one side of the bottom end 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. The inner cavity of the sealing tube 18 is movably connected to a spiral feed shaft 25 adapted to the discharge port 28. The spiral feed shaft 25 is connected to the sealing tube 18 via a telescopic rotating structure. A discharge pipe 30 is provided at the bottom of the end of the sealing tube 18 away from the discharge port 28, and an electric ball valve is provided on one side of the discharge pipe 30. The telescopic rotating structure includes a third hydraulic telescopic rod 19 connected to the sealing tube 18. The end of the output shaft of the third hydraulic telescopic rod 19 is connected to a first servo motor 29. The end of the output shaft of the first servo motor 29 is connected to a baffle 26. The baffle 26 is connected to the power input end of the spiral feed shaft 25. The baffle 26 is located on the side of the discharge pipe 30 away from the one-way valve.

[0037] Through the setting of the discharge assembly, when the one-way valve is closed, under the action of the third hydraulic telescopic rod 19, the spiral feeding shaft 25 extends away from one end of the third hydraulic telescopic rod 19 to the inner cavity of the one-way valve. When the first servo motor 29 rotates, the first servo motor 29 can drive the spiral feeding shaft 25 to rotate. The spiral feeding shaft 25 can be used to discharge the residual material in the one-way valve to avoid residue accumulation in the one-way valve, extend the service life of the one-way valve, and facilitate the use of the rotary cleaning scraper 33. At this time, the baffle 26 is still located on the side of the discharge pipe 30 away from the one-way valve, and the baffle 26 is used to block the drilling residue to prevent 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 crawler body 1, and the auxiliary support structure includes a mobile frame 4. The mobile frame 4 is connected to the crawler body 1 through a translation structure. The translation structure can be a ball screw pair 5 in the prior art. The mobile frame 4 is connected to the crawler body 1 through the ball screw pair 5, and a fourth servo motor 6 is provided on the crawler body 1. The fourth servo motor 6 is used to drive the ball screw pair 5 to achieve precise linear motion, and the ball screw pair 5 drives the mobile frame 4 to move linearly.

[0039] A first positioning structure is provided at the bottom of the mobile frame 4 near one end of the support frame 2, a connecting rod 10 is movably connected to the top of the mobile frame 4 near one end of the support frame 2, a second positioning structure is provided at the bottom of the connecting rod 10 away from one end of the mobile frame 4, and a fifth servo motor 9 is provided at one end of the mobile frame 4 near the support frame 2, and the fifth servo motor 9 drives the connecting rod 10 to realize rotational movement. The first positioning structure and the second positioning structure both include a first hydraulic telescopic rod 7 and a positioning plug rod 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 plug rod 8 can be inserted into the ground. The first positioning structure and the second positioning structure are used to increase the contact area between the crawler body 1 and the ground, adjust the center of gravity distribution of the crawler body 1, and improve the stability of the crawler body 1. In addition, the position of the second positioning structure can be adjusted according to demand to improve the adaptability of the auxiliary support structure.

[0040] To sum up: when the crawler reverse circulation drilling rig is used, the user adjusts the position of the first positioning structure and the second positioning structure as needed, uses the auxiliary support structure to improve the center of gravity distribution of the crawler body 1, improves the stability of the crawler reverse circulation drilling rig, and facilitates the drilling operation of this application. When the one-way valve is closed, the discharge assembly works. Under the action of the third hydraulic telescopic rod 19, the spiral feed shaft 25 extends away from one end of the third hydraulic telescopic rod 19 to the inner cavity of the one-way valve. When the first servo motor 29 rotates, the first servo motor 29 can drive the spiral feed shaft 25 to rotate. The spiral feed shaft 25 can be used to discharge the residual material in the one-way valve to prevent residue from accumulating in the one-way valve and prolong the service life of the one-way valve. At this time, the baffle 26 is still located on the side of the discharge pipe 30 away from the one-way valve. The baffle 26 is used to block the drilling residue to prevent the drilling residue from affecting the work of the first servo motor 29 and the third hydraulic telescopic rod 19. After the residue in the one-way valve is discharged, the third servo motor 32 drives the rotary cleaning scraper 33 to rotate to clean the inner wall of the valve body 11 and the bottom of the plunger 27 to prevent the plunger 27 from sticking to the inner wall of the valve body 11, thereby ensuring the flexibility of the plunger 27 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] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each structure adopt conventional technical means such as mature bolt connections in the existing technology. Machinery, parts and equipment all adopt conventional models in the existing technology. The material of each component can be selected according to needs and is not limited here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and modifications 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 attached claims and their equivalents.

Claims

1. A crawler reverse circulation drilling rig, comprising a crawler vehicle body (1), characterized in that: A support frame (2) is provided on one side of the crawler vehicle body (1), a lifting structure (3) is provided on the top of the support frame (2), an output shaft end of the lifting structure (3) is connected to a drilling structure, and the drilling structure comprises a one-way valve connected to the output shaft end of the lifting structure (3), a slag discharge pipe (17) connected to the liquid outlet end of the one-way valve, a rotating pipe (14) movably connected to the liquid inlet end 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 comprises 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) through 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) is in contact with the inner wall of the valve body (11), and the inner cavity of the valve body (11) is movably connected to the bottom of the plunger (27); The wall attachments are cleaned; 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), and the discharge assembly includes a sealing tube (18) connected to the valve body (11), the inner cavity of the sealing tube (18) is movably connected to a spiral feeding shaft (25) adapted to the discharge port (28), and the spiral feeding shaft (25) is connected to the sealing tube (18) through a telescopic rotating structure, and a discharge pipe (30) is provided at the bottom of one end of the sealing tube (18) away from the discharge port (28), and an electric ball valve is provided on one side of the discharge pipe (30).

2. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: An auxiliary support structure is provided on the crawler vehicle body (1), and the auxiliary support structure includes a mobile frame (4). The mobile frame (4) is connected to the crawler vehicle body (1) via a translation structure. A first positioning structure is provided at the bottom of the mobile frame (4) close to one end of the support frame (2). A connecting rod (10) is movably connected to the top of the mobile frame (4) close to one end of the support frame (2). A second positioning structure is provided at the bottom of the connecting rod (10) away from one end of the mobile frame (4).

3. The crawler-type reverse circulation drilling rig according to claim 2, characterized in that: The first positioning structure and the second positioning structure both comprise a first hydraulic telescopic rod (7) and a positioning insertion rod (8) connected to the end of the output shaft of the first hydraulic telescopic rod (7).

4. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: A displacement sensor (24) is provided on the top of the plunger (27), 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), and when the electromagnet (23) is in an energized state, the electromagnet (23) and the top of the plunger (27) are in a state of magnetic attraction, and a pressure sensor (31) is provided on the bottom of the plunger (27).

5. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: The outer surface of the plunger (27) is wrapped with a sealing airbag (34), and the top of the plunger (27) is provided with an inflation and deflation air pump (22). The sealing airbag (34) is connected to the inflation and deflation air pump (22) to achieve inflation and deflation.

6. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: A scraper ring (35) is fixedly connected to the top end of the inner cavity of the valve body (11), and 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. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: The telescopic rotating structure comprises 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 spiral feeding shaft (25), and the baffle (26) is located on the side of the discharge pipe (30) away from the one-way valve.

8. The crawler-type reverse circulation drilling rig according to claim 1, characterized in that: The drilling structure further comprises a driving assembly, the driving assembly being connected to the bottom end of the valve body (11), and the rotating tube (14) is driven by the driving assembly to achieve rotational motion.

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