An ultrasonic mud cleaning device for rotary drilling rigs and its usage method

Abstract

This invention provides an ultrasonic cleaning device and method for use in rotary drilling rigs. The ultrasonic cleaning device includes a fixed cylinder mounted on the power head of a rotary drilling rig. The fixed cylinder has a cavity in the middle and a central hole at the top that matches the outer diameter of the drill rod. The cylinder wall consists of an inner shell, an inner cavity, a sound-absorbing material layer, and an outer shell, arranged from the inside out. Multiple sets of ultrasonic transducers at different heights are respectively installed in the inner cavities on both sides of the fixed cylinder. The ultrasonic transducers are connected to an ultrasonic power supply installed on the rotary drilling rig via control circuitry. A water supply pipe is connected to the central cavity of the fixed cylinder, and multiple sets of nozzles are symmetrically and evenly hung on the water supply pipe. The end of the water supply pipe away from the nozzles is connected to the outlet of a water pump installed on the rotary drilling rig, and the inlet of the water pump is connected to a water tank. This invention utilizes the "ultrasonic cavitation effect" generated by ultrasound in water to powerfully and thoroughly remove sticky mud or high-moisture-content slag adhering to the inside of the rotary drilling rig.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering, specifically to an ultrasonic cleaning device for rotary drilling rigs and its usage method. Background Technology

[0002] Rotary drilling rigs are widely used in pile foundation construction in geotechnical engineering fields such as municipal engineering, building construction, and road and bridge construction. Rotary drilling rigs require cyclic soil removal and unloading to complete the pile hole construction. In order to remove as much soil as possible from the drill bit, especially for soil with high water content or strong cohesion, the commonly used method is to shake the drill rod of the rotary drilling rig up and down and vibrate it left and right. This method is difficult to completely remove the soil from the drill bit, which not only consumes energy, wears down the machine, and is time-consuming and inefficient, but also generates a lot of noise, which adversely affects the surrounding environment of the construction site and the lives of residents.

[0003] Existing cleaning devices for rotary drilling rigs can only clean the mud on the surface of the drill rod and auger bit, but cannot clean the inside of the rotary drilling barrel. In addition, conventional cleaning devices also have the problem of incomplete cleaning and inability to thoroughly clean. Moreover, some cleaning devices can damage the original drilling rig structure and are inconvenient to install. In actual operation, the installed cleaning devices can affect the normal operation of the rotary drilling rig, affect the original structural function, and cause inconvenience in use. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides an ultrasonic cleaning device and method for use in rotary drilling rigs. Based on the structural characteristics of the rotary drilling rig and the rig itself, this device can be installed without damaging or affecting the original structure and function of the drilling rig. It can thoroughly clean the inside of the rotary drilling rig, is easy to use, and improves work efficiency.

[0005] The technical solution provided by this invention is as follows: An ultrasonic mud cleaning device for a rotary drilling rig includes a fixed cylinder installed on the power head of the rotary drilling rig. The bottom of the fixed cylinder is open, the middle is a cavity, and the top has a central hole matching the outer diameter of the drill rod. The cylinder wall of the fixed cylinder consists of an inner shell, an inner cavity, a sound-absorbing material layer, and an outer shell from the inside to the outside. Multiple sets of ultrasonic transducers of different heights are respectively installed in the inner cavities on both sides of the fixed cylinder. The ultrasonic transducers are connected to an ultrasonic power supply installed on the rotary drilling rig through control circuits. A water supply pipe is connected to the middle cavity of the fixed cylinder. Multiple sets of nozzles are symmetrically and evenly hung on the water supply pipe. The end of the water supply pipe away from the nozzles is connected to the outlet of a water pump installed on the rotary drilling rig, and the inlet of the water pump is connected to a water tank.

[0006] Furthermore, the top of the fixed cylinder is provided with four symmetrically and evenly distributed connecting plates. The upper part of the connecting plates is fully welded to the side wall of the rotary drilling rig's power head, and the lower part of the connecting plates is fully welded to the top of the fixed cylinder.

[0007] Furthermore, the sound-absorbing material layer is sound-absorbing cotton or other damping sound-absorbing material, and the sound-absorbing material layer is densely filled and wrapped between the inner cavity and the outer shell of the device. The inner shell is a thin layer of high-strength and elastic metal material.

[0008] Furthermore, the inner diameter of the fixed cylinder is larger than the outer diameter of the rotary drilling rig to be cleaned, with a total difference of no more than 2mm, and the inner shell of the fixed cylinder is coated with lubricating oil.

[0009] Furthermore, the dimensions and positions of the water supply pipe and multiple sets of nozzles correspond to the dimensions and positions of the drainage and venting ports on the top of the rotary drilling rig to be cleaned. During the drilling rod lifting process, the nozzles enter the interior of the rotary drilling rig through the drainage and venting ports.

[0010] Furthermore, the nozzle includes an upper nozzle and a lower nozzle. The outer surface of each nozzle has water outlet holes evenly distributed in a hemispherical shape. The water jet from the upper nozzle is arranged in a hemispherical radial pattern, circling the central axis of the nozzle and facing the top of the rotary drilling barrel. The water jet from the lower nozzles on both sides is arranged in a hemispherical radial pattern, symmetrically facing the inner wall of the rotary drilling barrel to the left and right, respectively, circling the central axis of the nozzle.

[0011] Another technical solution provided by the present invention: a method for using an ultrasonic mud cleaning device for rotary drilling barrels, comprising the following steps:

[0012] (1) Based on the shape and size of the rotary drilling barrel, rotary drilling rig power head, shock absorber ring, drill rod and related components to be cleaned, design the size of the fixed cylinder of the ultrasonic cleaning device and the internal ultrasonic transducer and internal control circuit. Based on the size and position of the drainage and exhaust port of the rotary drilling barrel, design the size and position of the water supply pipe and multiple sets of nozzles.

[0013] (2) Make a fixed cylinder according to the design parameters, and weld it to the power head of the rotary drilling rig through the connecting plate. Install a water tank, water pump and ultrasonic power supply on the base of the rotary drilling rig. Connect the water tank, water pump and water supply pipe in sequence. Connect the ultrasonic power supply to the ultrasonic transducer through the control line.

[0014] (3) After the rotary drilling rig completes each drilling cycle, the rotary drilling rig lifts the entire rotary drilling rig into the fixed cylinder. The nozzle enters the interior of the rotary drilling rig through the drainage and exhaust port. Due to gravity, the residual mud or slag after normal soil falling still needs to be removed.

[0015] (4) Turn on the water pump and ultrasonic power supply, and the fixed cylinder enters the normal working state. The water flows through multiple sets of nozzles and sprays onto the top and side walls of the rotary drilling cylinder to wet the mud or slag, forming a water film between the mud or slag and the rotary drilling cylinder.

[0016] (5) Multiple ultrasonic transducers start working and emit ultrasonic waves. Through the rotary drilling barrel, the ultrasonic waves generate "ultrasonic cavitation effect" in the water, which drives the sludge or slag to produce cavitation effect between the water film and the rotary drilling barrel, dispersing and peeling off the sludge or slag, so that it is removed from the rotary drilling barrel to achieve the purpose of cleaning.

[0017] (6) During normal sludge removal work, the height of the rotary drilling rig inside the fixed cylinder and its rotation relative to the fixed cylinder around the central axis are repeatedly adjusted to allow ultrasonic energy and nozzle water flow to fully cover the rotary drilling rig and achieve thorough cleaning.

[0018] (7) After cleaning is completed, proceed to the next drilling operation, and then repeat steps (3)-(7) until the rotary drilling project is completed.

[0019] Furthermore, in step (5), the ultrasonic transducer is set with different working durations and power according to the actual needs of use.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The rotary drilling barrel to be cleaned enters the ultrasonic cleaning device. Utilizing the "ultrasonic cavitation effect" generated by ultrasonic waves in water, the ultrasonic transducer is set with appropriate working time and power to powerfully and thoroughly clean and remove the sticky mud or high water content slag adhering to the inside of the rotary drilling barrel.

[0022] (2) Compared with the traditional "soil-throwing" method of rotary drilling rigs, it is more efficient in construction. Moreover, the outer side of the ultrasonic transducer of this invention is completely wrapped with sound-absorbing material, which absorbs and reduces cavitation noise and jet water noise, and the generated noise is greatly reduced.

[0023] (3) Compared with the soil removal methods that use mechanical bulldozing or pressurized water flow soil removal devices installed inside the rotary drilling barrel, the present invention does not occupy the internal space of the rotary drilling barrel. The addition can be done without damaging or affecting the original structure and function of the drilling machine, thus saving mechanical maintenance costs.

[0024] (4) Currently available auxiliary soil cleaning methods using external mechanical scraping devices are prone to wear and tear on the inner wall of the drill bit. After long-term operation, the end of the mechanical scraping device is prone to wear and tear, resulting in incomplete soil scraping and reduced efficiency. However, the present invention causes almost no wear and tear on the drill bit and the device itself with long-term use, and the mud cleaning is more efficient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the drill bit in the tunneling working state of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention in the mud-cleaning state after the drill bit has completed one excavation cycle;

[0027] Figure 3 This is a schematic diagram of the structure of the fixing cylinder of the present invention;

[0028] Figure 4 This is a schematic diagram showing the side wall details of the fixing cylinder of the present invention;

[0029] Figure 5 This is a magnified schematic diagram showing a partial detail of the drill bit's working state during excavation.

[0030] Figure 6 This is a magnified schematic diagram showing the mud-cleaning process after the drill bit of this invention has completed one excavation cycle;

[0031] Figure 7 This is a magnified schematic diagram showing the local details of repeatedly adjusting the height of the drill barrel and rotating it around the central axis during the mud-cleaning process of this invention;

[0032] Figure 8 This is a top view of the connection between the fixed cylinder and the rotary drilling rig power head of the present invention;

[0033] Figure 9 This is a top view schematic diagram of the fixed cylinder and the rotary drilling cylinder of the present invention;

[0034] Figure 10 This is a schematic diagram of the nozzle structure of the present invention.

[0035] In the diagram: 1—Rotary drilling rig, 2—Rotary drilling rig power head, 2-1—Shock-absorbing ring, 3—Rotary drilling rod, 3-1—Rotary drilling barrel, 3-2—Bottom of the drilling barrel, 3-3—Drainage and exhaust port, 3-4—Connection port between the rotary drilling barrel and the drilling rod, 4—Fixed cylinder, 4-1—Connecting plate, 4-2—Inner cavity, 4-3—Ultrasonic transducer, 4-4—Sound-absorbing material layer, 4-5—Control circuit, 4-6—Water supply pipe, 4-7—Nozzle, 4-8—Inner shell, 4-9—Outer shell, 4-10—Nozzle outlet, 5—Ground, 6—Water tank, 7—Water pump, 8—Ultrasonic power supply, 9—Central axis of the rotary drilling rod (drill barrel). Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "front," "rear," "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1

[0040] An ultrasonic cleaning device for a rotary drilling rig includes a fixed cylinder 4 mounted on the power head 2 of the rotary drilling rig. The bottom of the fixed cylinder 4 is open, the middle is a cavity, and the top has a central hole that matches the outer diameter of the rotary drilling rod 3 and the shock-absorbing ring 2-1. The cylinder wall of the fixed cylinder 4 consists of an inner shell 4-8, an inner cavity 4-2, a sound-absorbing material layer 4-4, and an outer shell 4-9 from the inside to the outside. Multiple sets of ultrasonic transducers 4-3 at different heights are respectively installed in the inner cavities 4-2 on both sides of the fixed cylinder 4. The ultrasonic transducers 4-3 are connected to an ultrasonic power supply 8 installed on the rotary drilling rig 1 through a control line 4-5. A water supply pipe 4-6 is connected to the middle cavity of the fixed cylinder 4. Multiple sets of nozzles 4-7 are symmetrically and evenly hung on the water supply pipe 4-6. The end of the water supply pipe 4-6 away from the nozzles 4-7 is connected to the outlet of a water pump 7 installed on the rotary drilling rig 1. The inlet of the water pump 7 is connected to a water tank 6.

[0041] The top of the fixed cylinder 4 is provided with four symmetrically and evenly distributed connecting plates 4-1. The upper part of the connecting plates 4-1 is fully welded to the side wall of the rotary drilling rig power head 2, and the lower part of the connecting plates 4-1 is fully welded to the top of the fixed cylinder 4.

[0042] The sound-absorbing material layer 4-4 is sound-absorbing cotton or other damping sound-absorbing material. The sound-absorbing material layer 4-4 is densely filled and wrapped between the inner cavity 4-2 and the outer shell 4-9 of the device. The inner shell 4-8 is a thin layer of high-strength and elastic metal material.

[0043] To ensure that the ultrasonic transducer 4-3 is in close contact with the side wall of the rotary drilling rig 3-1 to be cleaned when it is working, and that the energy transmission efficiency is high and there is no loss, the inner diameter of the fixed cylinder 4 is slightly larger than the outer diameter of the rotary drilling rig 3-1 to be cleaned, with a total difference of no more than 2mm. The inner shell 4-8 of the fixed cylinder 4 is coated with lubricating oil to facilitate the smooth entry of the rotary drilling rig 3-1 to be cleaned.

[0044] The dimensions and positions of the water supply pipe 4-6 and the multiple sets of nozzles 4-7 correspond to the dimensions and positions of the drainage and venting ports 3-3 on the top of the rotary drilling barrel 3-1 to be cleaned. During the lifting process of the rotary drilling rod 3, the nozzles 4-7 enter the interior of the rotary drilling barrel 3-1 through the drainage and venting ports 3-3.

[0045] The nozzle 4-7 includes an upper nozzle and a lower nozzle. The outer surface of each nozzle 4-7 is uniformly distributed with nozzle outlet holes 4-10 in a hemispherical shape. The water jet from the upper nozzle 4-7 is arranged in a hemispherical radial pattern around the central axis of the nozzle and facing the top of the rotary drilling barrel 3-1. The water jet from the lower nozzles 4-7 on both sides is arranged in a hemispherical radial pattern symmetrically to the left and right, respectively, around the central axis of the nozzle and facing the inner wall of the rotary drilling barrel 3-1.

[0046] Example 2

[0047] A method of using an ultrasonic mud-cleaning device for a rotary drilling rig includes the following steps:

[0048] (1) Based on the shape and size of the rotary drilling barrel 3-1 to be cleaned, the rotary drilling rig power head 2, the shock absorption ring 2-1, the rotary drilling rod 3 and related components, design the size of the fixed cylinder 4 of the ultrasonic cleaning device and the internal ultrasonic transducer 4-3 and control circuit 4-5. Based on the size and position of the drainage and exhaust port 3-3 of the rotary drilling barrel, design the size and position of the water supply pipe 4-6 and the multiple sets of nozzles 4-7.

[0049] (2) Make a fixed cylinder 4 according to the design parameters, and weld it to the rotary drilling rig power head 2 through the connecting plate 4-1. Install a water tank 6, a water pump 7 and an ultrasonic power supply 8 on the base of the rotary drilling rig 1. Connect the water tank 6, the water pump 7 and the water supply pipe 4-6 in sequence. Connect the ultrasonic power supply 8 to the ultrasonic transducer 4-3 through the control line 4-5.

[0050] (3) After each drilling cycle is completed, the rotary drilling rig 1 lifts the rotary drilling rig 3-1 completely into the fixed cylinder 4. The nozzle 4-7 enters the interior of the rotary drilling rig 3-1 through the drainage and exhaust port 3-3. Due to gravity, the residual mud or slag after normal soil falling still needs to be removed.

[0051] (4) Turn on the water pump 7 and ultrasonic power supply 8, and the fixed cylinder 4 enters the normal working state. The water flows through the multiple sets of nozzles 4-7 and sprays onto the top and surrounding side walls of the rotary drilling barrel 3-1 to wet the mud or slag, forming a water film between the mud or slag and the rotary drilling barrel 3-1.

[0052] (5) Multiple ultrasonic transducers 4-3 start working and emit ultrasonic waves. Through the rotary drilling barrel 3-1, the ultrasonic waves generate "ultrasonic cavitation effect" in the water, which drives the sludge or slag to produce cavitation between the water film between the rotary drilling barrel 3-1, disperses and peels off the sludge or slag, and removes it from the rotary drilling barrel 3-1 to achieve the purpose of cleaning.

[0053] (6) During the normal sludge removal process, the height of the rotary drilling barrel 3-1 inside the fixed barrel 4 and its rotation around the central axis relative to the fixed barrel 4 are repeatedly adjusted to allow ultrasonic energy and nozzle water flow to fully cover the rotary drilling barrel 3-1 for thorough cleaning. This avoids the problems of large-diameter or deep and long drilling barrels being prone to mud caking, large removal volume, many removal points, and easy to miss dead corners, and achieves comprehensive, powerful, and thorough removal of mud and slag from the inner wall of the rotary drilling barrel.

[0054] (7) After cleaning is completed, proceed to the next drilling operation, and then repeat steps (3)-(7) until the rotary drilling project is completed.

[0055] In step (5), the appropriate working time and power of the ultrasonic transducer (4-3) are set according to the actual needs of use.

[0056] This invention employs an ultrasonic cleaning device that uses ultrasonic waves to generate micro-vortices and micro-bubbles, peeling away dirt from the surface of the object being cleaned, thus achieving the cleaning purpose. The "ultrasonic cavitation effect" generated by ultrasound in water, based on the pressure difference created by sound waves, gathers gases in the liquid together to form small bubbles, separating dirt from the surface of the object being cleaned, thereby achieving the cleaning effect. Based on the "ultrasonic cavitation effect" generated by ultrasound in water, it powerfully and thoroughly cleans and removes the sticky mud or high-moisture-content slag adhering to the inside of the rotary drilling rig. Furthermore, the ultrasonic mud-cleaning device is entirely wrapped with sound-absorbing material, absorbing and reducing cavitation noise and water spray noise. Compared to the traditional method of rotary drilling rigs relying entirely on mechanical shaking to "throw away" soil, this method is more efficient, does not alter the internal structure of the drilling rig, does not damage the drill bit or other components, significantly reduces noise, and has a relatively simple manufacturing process, greatly improving project progress. This invention has a wide range of applications, particularly suitable for removing sticky mud with high moisture content and for rotary drilling pile foundation projects with long drilling rigs, large drilling volumes, and large and difficult-to-remove sticky mud.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic mud-cleaning device for rotary drilling barrels, characterized in that, The device includes a fixed cylinder (4) mounted on the power head (2) of a rotary drilling rig. The bottom of the fixed cylinder (4) is open, the middle is a cavity, and the top has a central hole that matches the outer diameter of the rotary drilling rod (3). The cylinder wall of the fixed cylinder (4) consists of an inner shell (4-8), an inner cavity (4-2), a sound-absorbing material layer (4-4), and an outer shell (4-9) from the inside to the outside. Multiple sets of ultrasonic transducers (4-3) at different heights are respectively installed in the inner cavities (4-2) on both sides of the fixed cylinder (4). The ultrasonic transducer (4-3) is connected to the ultrasonic power supply (8) set on the rotary drilling rig (1) through the control line (4-5). A water supply pipe (4-6) is connected in the middle cavity of the fixed cylinder (4). Multiple sets of nozzles (4-7) are symmetrically and evenly hung on the water supply pipe (4-6). The end of the water supply pipe (4-6) away from the nozzle (4-7) is connected to the outlet of the water pump (7) set on the rotary drilling rig (1). The inlet of the water pump (7) is connected to the water tank (6). The dimensions and positions of the water supply pipe (4-6) and multiple sets of nozzles (4-7) correspond to the dimensions and positions of the drainage and venting ports (3-3) on the top of the rotary drilling barrel (3-1) to be cleaned. During the lifting process of the rotary drilling rod (3), the nozzles (4-7) enter the interior of the rotary drilling barrel (3-1) through the drainage and venting ports (3-3). The nozzle (4-7) includes an upper nozzle and a lower nozzle. The outer surface of each nozzle (4-7) is uniformly distributed with nozzle outlet holes (4-10) in a hemispherical shape. The water jet from the upper nozzle (4-7) is arranged in a hemispherical radial pattern around the central axis of the nozzle and facing the top of the rotary drilling barrel (3-1). The water jet from the lower nozzles (4-7) on both sides is arranged in a hemispherical radial pattern symmetrically to the left and right, respectively, around the central axis of the nozzle and facing the inner wall of the rotary drilling barrel (3-1).

2. The ultrasonic mud-cleaning device for rotary drilling barrels according to claim 1, characterized in that, The top of the fixed cylinder (4) is provided with four symmetrically and evenly distributed connecting plates (4-1). The upper part of the connecting plate (4-1) is fully welded to the side wall of the rotary drilling rig power head (2), and the lower part of the connecting plate (4-1) is fully welded to the top of the fixed cylinder (4).

3. The ultrasonic mud-cleaning device for rotary drilling barrels according to claim 1, characterized in that, The sound-absorbing material layer (4-4) is sound-absorbing cotton or other damping sound-absorbing material. The sound-absorbing material layer (4-4) is densely filled and wrapped between the inner cavity (4-2) and the outer shell (4-9) of the device. The inner shell (4-8) is a thin layer of high-strength and elastic metal material.

4. An ultrasonic mud-cleaning device for rotary drilling barrels according to claim 1, characterized in that, The inner diameter of the fixed cylinder (4) is larger than the outer diameter of the rotary drilling cylinder (3-1) to be cleaned, and the total difference is not greater than 2mm. The inner shell (4-8) of the fixed cylinder (4) is coated with lubricating oil.

5. A method of using an ultrasonic mud-cleaning device for a rotary drilling rig, implemented based on the ultrasonic mud-cleaning device according to claim 2, characterized in that, Includes the following steps: (1) Based on the shape and size of the rotary drilling rig barrel (3-1), the rotary drilling rig power head (2), the shock absorption ring (2-1), and the rotary drilling rod (3), design the size of the fixed cylinder (4) of the ultrasonic cleaning device and the internal ultrasonic transducer (4-3) and control circuit (4-5). Based on the size and position of the drainage and exhaust port (3-3) of the rotary drilling rig barrel, design the size and position of the water supply pipe (4-6) and the multiple sets of nozzles (4-7). (2) Make a fixed cylinder (4) according to the design parameters, and weld it to the rotary drilling rig power head (2) through the connecting plate (4-1). Install a water tank (6), a water pump (7) and an ultrasonic power supply (8) on the base of the rotary drilling rig (1). Connect the water tank (6), the water pump (7) and the water supply pipe (4-6) in sequence. Connect the ultrasonic power supply (8) to the ultrasonic transducer (4-3) through the control line (4-5). (3) After each drilling cycle is completed by the rotary drilling rig (1), the rotary drilling rig (3-1) is lifted and fully inserted into the fixed cylinder (4). The nozzle (4-7) enters the interior of the rotary drilling rig (3-1) through the drainage and exhaust port (3-3). Due to gravity, the residual mud or slag after normal soil falling still needs to be removed. (4) Turn on the water pump (7) and ultrasonic power supply (8), and the fixed cylinder (4) enters normal working state. Water flows through multiple sets of nozzles (4-7) and sprays onto the top and surrounding side walls of the rotary drilling barrel (3-1) to wet the mud or slag, forming a water film between the mud or slag and the rotary drilling barrel (3-1). (5) Multiple sets of ultrasonic transducers (4-3) start to work and emit ultrasonic waves. Through the rotary drilling barrel (3-1), the ultrasonic waves generate "ultrasonic cavitation effect" in the water, which drives the sludge or slag to produce cavitation effect between the water film between the rotary drilling barrel (3-1), disperses and peels off the sludge or slag, and removes it from the rotary drilling barrel (3-1) to achieve the purpose of cleaning. (6) During normal sludge removal work, the height of the rotary drilling rig (3-1) inside the fixed cylinder (4) and its rotation around the central axis relative to the fixed cylinder (4) are adjusted repeatedly to allow ultrasonic energy and nozzle water flow to fully cover the rotary drilling rig (3-1) for thorough cleaning. (7) After cleaning is completed, proceed to the next drilling operation, and then repeat the cycle of steps (3)-(7) until the rotary drilling project is completed.

6. The method of using the ultrasonic mud-cleaning device for rotary drilling rigs according to claim 5, characterized in that, In step (5), the ultrasonic transducer (4-3) is set with different working time and power according to the actual needs of use.

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