Displacement generating device for hydraulic direct-push drilling machine

Abstract

The displacement generating device comprises a tetragonal machine body, a motor device, a hydraulic valve and an electric cabinet, and an oil outlet of a hydraulic pump is connected with a port P of the hydraulic valve; a cylindrical bulge, a central blind hole and a radial blind hole are respectively arranged on the lower surface of the machine body, radial, vertical and circumferential oil ducts are arranged in the machine body, a horizontal oil duct is connected with an air filter and a liquid level meter, and a communicating oil duct is arranged in the concave structure; the top cylinder body is connected with the cavity III; the bottom cylinder body is connected with the central blind hole to form a cavity II; the radial oil duct is communicated with the upper and lower blind holes to form a sealing cavity I filled with incompressible fluid; the radial blind holes in the bottom and the circumferential oil duct form a cavity IV which is communicated with a port B of the hydraulic valve; the hydraulic valve A port drives the cavity III to push the top piston rod, fluid is transferred to the bottom piston rod through the cavity I, and hydraulic oil in the cavity IV flows back to the cavity II through the T port. High-precision displacement synchronization is achieved through the incompressible fluid medium, and the positioning and sampling performance of the drilling machine is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic direct-push drilling rigs, and in particular relates to a displacement generating device for a hydraulic direct-push drilling rig. Background Art

[0002] As specialized equipment integrating drilling, pressurizing, and traveling functions, hydraulic direct-push drills play a key role in numerous fields, including soil sampling, geological exploration, and environmental monitoring. Relying on the powerful downward force generated by the hydraulic system, they drive the drill tool deep into the ground with zero or low rotation, achieving efficient and low-disturbance drilling and sampling operations.

[0003] The drilling process of a hydraulic direct-push drilling rig relies on the thrust generated by the hydraulic cylinder, which propels the drill tool downward along the mast guide rail, achieving zero-rotation or low-rotation drilling. The hydraulic systems used in these rigs are all common open-type systems, such as standard open-center fixed-position systems or load-sensing systems. However, due to the inherent low response and high hysteresis characteristics of these hydraulic systems, the positioning accuracy of the drill tool when the hydraulic cylinder propels it is limited to millimeter levels, making it difficult to meet the high-precision positioning requirements required under specific operating conditions.

[0004] The present invention has successfully developed an integrated and modular precision displacement generating device. This device can significantly improve the millimeter-level positioning accuracy of the drilling tool to the micron level without changing the system principle and structure of the existing drilling rig. It also has the advantages of being ready for installation and quick, providing a practical solution for precision drilling and sampling operations. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a displacement generating device for a hydraulic direct-push drilling rig.

[0006] The present invention is achieved as follows: a displacement generating device for a hydraulic direct-push drilling rig comprises: a body of a cubic structure, the upper surface of which is provided with a motor device, a hydraulic valve and an electric control box; the motor device includes a motor and a hydraulic pump, the oil outlet of the hydraulic pump is connected to the P port of the hydraulic valve through a pipeline; a cylindrical protrusion and a blind hole are provided at the center of the upper surface of the body, a central blind hole and radial blind holes are provided at the lower surface, radial oil passages, vertical oil passages, circumferential oil passages and horizontal oil passages are provided inside, wherein the horizontal oil passage located at the upper part is connected to the air filter; the middle and lower horizontal oil passages are connected to the liquid level gauge; a left side horizontal oil passage is arranged along the left side concave structure of the central blind hole of the lower surface, and an upper surface vertical oil passage is provided perpendicular to the direction of the left side horizontal oil passage and connected to the upper surface of the body; the top cylinder body is connected to the cylindrical protrusion by bolts, and the top piston rod and the top cylinder cover are coaxially arranged inside to form a cavity III;

[0007] The outer circle of the piston of the top piston rod is provided with a sealing ring assembly, and the end of the top piston rod is connected to the sensor plate, and the displacement sensor is installed on the sensor plate;

[0008] A bottom piston rod is provided in the bottom cylinder body, and the end of the bottom piston rod is connected to a top block assembly through a bolt; the top block assembly is connected in series with the drilling mechanism of the drilling rig;

[0009] The bottom cylinder body is connected to the central blind hole by bolts to form cavity II. The side of the bottom cylinder body is provided with a flat notch and a side threaded through hole. The side threaded through hole is connected to the hydraulic pump through a pipeline; the radial oil passage connects the blind holes and the radial blind holes, the vertical oil passage is sealed by a plug, and the circumferential oil passage forms a loop through a pipeline; the top cylinder body, the top piston rod, the body and the bottom piston rod form a sealed cavity I through an incompressible fluid medium; the radial blind hole, the bottom piston rod and the bottom cylinder cover form a cavity IV through hydraulic oil; the A port of the hydraulic valve is connected to the cavity III through a pipeline, the B port is connected to the cavity IV through a pipeline, the T port is connected to the cavity II through a filter, and the oil suction port of the hydraulic pump is connected to the cavity II.

[0010] Further preferably, bosses are provided on the left and right sides of the upper surface of the body, the bosses are connected to the hydraulic valve and the electric control box through threaded holes, the bosses are connected to the base of the motor device through threaded holes, and the base is fixed to the bosses by bolts.

[0011] Further preferably, the top cylinder body is a cylindrical hollow structure, the upper flange of which is connected to the top cylinder cover by bolts, and a plurality of annular grooves are provided on the outer circular surface and the hollow surface of the top cylinder cover, and the annular grooves are used to install the sealing ring assembly; the lower flange is provided with an O-ring groove and is sealed with the body through the O-ring, and the side of the top cylinder body is provided with a threaded through hole and a boss, and the boss is connected to the sensor plate through a threaded blind hole.

[0012] Further preferably, the bottom cylinder body is a cylindrical structure, an O-ring groove is opened on its upper surface and is sealed with the body through the O-ring, and the threaded through hole on the bottom surface is blocked by a screw plug.

[0013] Further preferably, the recessed structures on the front and rear sides of the machine body are connected to the induction plate through blind holes, the horizontal oil channel on the left side is connected to the T-port of the hydraulic valve through a vertical oil channel, and a hydraulic oil filter is installed.

[0014] Further preferably, the bottom piston rod is provided with 4 groups, which are coaxially installed in the radial blind holes respectively, the bottom cylinder cover is connected to the threaded blind holes around the blind holes by bolts, and the outer circle surface and hollow surface of the bottom cylinder cover are provided with a plurality of annular grooves, which are used to install the sealing ring assembly; the piston rod is provided with a plurality of annular grooves in the circumferential direction of the piston outer circle, which are used to install the sealing ring assembly.

[0015] Further preferably, the top block assembly includes a base plate, a top plate and a guide sleeve, the base plate is bolted to the bottom piston rod through a through hole, a copper sleeve is provided in the guide sleeve and slides in conjunction with the guide rod; the threaded blind hole on the side of the base plate is connected to the displacement sensor.

[0016] Further preferably, the guide rod is installed in the through hole of the body and is fixed to the body by bolts, the guide through hole of the top block assembly is coaxially matched with the guide rod, and the copper sleeve is fixed to the guide sleeve by bolts.

[0017] Further preferably, the displacement generating device for the hydraulic direct-push drilling rig is characterized in that the cavity II is connected to the T port of the hydraulic valve through the horizontal oil channel and the vertical oil channel on the left side, the cavity III is connected to the A port of the hydraulic valve through the threaded through hole on the side of the top cylinder body, and the cavity IV is connected to the B port of the hydraulic valve through the circumferential oil channel.

[0018] Further preferably, the motor speed is set by an electric control box, the planar notch of the top piston rod is connected to the induction plate through a threaded blind hole, and the induction plate, the induction plate and the displacement sensor are connected to the electric control box through a signal line.

[0019] Advantages and technical effects of the present invention: The displacement generating device for the hydraulic direct-push drilling rig of the present invention has excellent overall technical effects, which are mainly reflected in highly integrated design, convenient installation, utilization of the incompressible characteristics of the fluid, and high-precision displacement control, which together promote a significant improvement in the positioning and sampling functions of the drilling rig system.

[0020] First, a major highlight of this device is its highly integrated design. By integrating all core components—the motor, hydraulic pump, hydraulic valve, cylinder block, cylinder head, and piston rod—into a single body, the device achieves a compact layout, significantly reducing its footprint. This not only makes the device easier to install and use within limited space, but also reduces the number of connection points and interfaces in the system, lowering the likelihood of failure and significantly improving its overall reliability.

[0021] Another key advantage of this device is its ease of installation. Mounting points are located on the front, back, left, and right sides of the unit, allowing it to be quickly and easily installed into existing drilling systems. This design greatly simplifies the installation process, improves efficiency, and enhances the device's versatility and adaptability, making it suitable for installation on a variety of drilling systems.

[0022] Furthermore, this device cleverly utilizes the incompressible nature of fluids to precisely translate millimeter-level displacement of the top piston into micrometer-level displacement of the bottom piston. This conversion process not only significantly improves positioning accuracy but also enables more precise sampling operations. Precise control of the hydraulic valves allows high-pressure hydraulic oil to efficiently circulate between the chambers, driving precise movement of the piston rod and further ensuring accurate and reliable sampling.

[0023] Finally, this device excels in precision control. By leveraging the proportional relationship between the effective working area of ​​the bottom piston rod and the top piston rod, the device achieves micron-level displacement control of the bottom piston rod. This high-precision displacement control enables the drill to precisely control feed rate during sampling, improving sampling accuracy and precision. For example, when the top piston rod's displacement accuracy is 0.5 mm, the bottom piston rod's positioning accuracy can reach 30 μm, achieving a leap from millimeter-level to micron-level precision control.

[0024] In summary, the displacement generator for hydraulic direct-push drilling rigs of this invention significantly enhances the positioning and sampling capabilities of drilling systems through its highly integrated design, convenient installation, utilization of the incompressible properties of fluids, and high-precision displacement control. Its superior technical performance not only improves the device's reliability and installation efficiency but also provides strong support for precise sampling during drilling operations, promising broad application prospects and market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1a-Figure 1c It is a schematic isometric view of the present invention;

[0026] Figure 2 It is an exploded view of the present invention;

[0027] Figure 3 yes Figure 5 DD cross-section diagram in;

[0028] Figure 4 yes Figure 6 Schematic diagram of CC cross section in ;

[0029] Figure 5 yes Figure 3 AA cross-sectional diagram in;

[0030] Figure 6 yes Figure 3 BB cross-section diagram in;

[0031] Figure 7a and Figure 7b It is a schematic diagram of the axonometric view of the body 1;

[0032] Figure 8a and Figure 8bIt is a schematic diagram of the axonometric view of the motor device;

[0033] Figure 9a and Figure 9b It is a schematic diagram of the axonometric view of the top cylinder;

[0034] Figure 10a and Figure 10b It is a schematic diagram of the axonometric view of the bottom cylinder;

[0035] Figure 11a and Figure 11b is a schematic diagram of the axonometric view of the top block assembly;

[0036] Figure 12a and Figure 12b It is a schematic diagram of the axonometric view of a hydraulic valve.

[0037] In the figure, 1, body; 1-1, boss; 1-2, boss; 1-3, threaded hole; 1-4, threaded hole; 1-5, cylindrical protrusion; 1-6, blind hole; 1-7, through hole; 1-8, recessed structure; 1-10, central blind hole; 1-11, radial blind hole; 1-12, radial oil passage; 1-13, vertical oil passage; 1-14, circumferential oil passage; 1-15, horizontal oil passage; 1-16, horizontal oil passage; 1-17, horizontal oil passage on the left side; 1-18, vertical oil passage on the upper surface Straight oil passage; 1-19, blind hole; 2, plug; 3, plug; 4, guide rod; 5, bolt; 6, motor assembly; 6-1, motor; 6-2, hydraulic pump; 6-3, oil suction port; 6-4, oil outlet; 6-5, base; 6-6, bolt; 7, electric control box; 8, first sealing ring assembly; 9, bottom piston rod; 10, second sealing ring assembly; 11, bottom cylinder cover; 12, bolt; 13, bolt; 14, top cylinder cover; 15, third sealing ring assembly; 16, top piston rod; 16-1, flat notch; 16-2, threaded blind hole; 17, sealing ring assembly; 18, filter; 19, induction plate; 20, sensor plate; 21, displacement sensor; 22, top cylinder; 22-1, upper flange; 22-2, lower flange; 22-3, O-ring groove; 22-4, threaded through hole; 22-5, boss; 22-6, threaded blind hole; 23, hydraulic valve; 24, induction plate; 25, O-ring; 26, bottom cylinder; 26-2, O-ring groove; 26- 3. Bottom threaded through hole; 26-4. Plane notch; 26-5. Side threaded through hole; 28. Displacement sensor; 29. ​​Copper sleeve; 31. Bolt; 32. Top block assembly; 32-1. Bottom plate; 32-2. Top plate; 32-5. Guide sleeve; 32-6. Side threaded blind hole; 32-7. Guide through hole; 32-8. Through hole; 33. Pipeline; 34. Pipeline; 35. Air filter; 36. Liquid level gauge; 37. O-ring; 38. Screw plug; 39. Incompressible fluid medium. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Please refer to Figures 1 to Figure 6 A displacement generating device for a hydraulic direct-push drilling rig comprises: a body 1 of a cubic structure, on the upper surface of which a motor device 6, a hydraulic valve 23 and an electric control box 7 are provided;

[0040] See also Figure 8a and Figure 8b The motor device 6 includes a motor 6-1 and a hydraulic pump 6-2. The oil outlet 6-4 of the hydraulic pump 6-2 is connected to the P port of the hydraulic valve 23 through a pipeline. Figure 12a and Figure 12b The upper surface of the engine body 1 is provided with a cylindrical protrusion 1-5 and a blind hole 1-6 in the center, and the lower surface is provided with a central blind hole 1-10 and radial blind holes 1-11. The interior is provided with radial oil passages 1-12, vertical oil passages 1-13, circumferential oil passages 1-14 and horizontal oil passages (1-15, 1-16). The upper horizontal oil passage (1-15) is connected to the air filter 35; the middle and lower horizontal oil passages 1-16 are connected to the liquid level gauge 36; a left side horizontal oil passage 1-17 is arranged along the left side recessed structure of the central blind hole 1-10 on the lower surface, and an upper surface vertical oil passage 1-18 is provided perpendicular to the left side horizontal oil passage 1-17 and communicates with the upper surface of the engine body 1;

[0041] The top cylinder body 22 is connected to the cylindrical protrusion 1-5 by bolts, and the top piston rod 16 and the top cylinder cover 14 are coaxially arranged inside to form the cavity III;

[0042] The piston outer circumference of the top piston rod 16 is provided with a sealing ring assembly 17. The end of the top piston rod 16 is connected to a sensor plate 20, on which a displacement sensor 21 is mounted. The bottom cylinder body 26 is connected to the central blind hole 1-10 by bolts to form chamber II. The side of the bottom cylinder body 26 is provided with a flat notch 26-4 and a side threaded through hole 26-5. The radial oil passage 1-12 connects the blind hole 1-6 with the radial blind hole 1-11. The vertical oil passage 1-13 is sealed by plugs 2 and 3. The circumferential oil passage 1-14 forms a circuit through pipes 33 and 34. The top cylinder body 22, the top piston rod 16, the body 1, and the bottom piston rod 9 form a sealed chamber I through an incompressible fluid medium 39. The radial blind holes 1-11, the bottom piston rod 9, and the bottom cylinder head 11 form a chamber IV through hydraulic oil. Port A of the hydraulic valve 23 is connected to chamber III through a pipe, port B is connected to chamber IV through a pipe, and port T is connected to chamber II through a filter 18.

[0043] The technical effect of the displacement generating device for hydraulic direct-push drilling rigs is remarkable, which is specifically reflected in the following aspects:

[0044] First, the device's cubical body design allows for compact integration of the motor unit, hydraulic valves, and electrical control box, reducing overall size while facilitating installation and maintenance. The cylindrical protrusions and blind holes on the upper surface of the body provide a secure foundation for the installation of the top and bottom cylinders, ensuring stable operation.

[0045] Secondly, the unit's internal oil passages are rationally arranged, with radial, vertical, circumferential, and horizontal passages forming an efficient hydraulic oil circulation system. This design not only ensures smooth flow of hydraulic oil but also enables real-time monitoring of hydraulic oil quality and level through the installation of air filters and liquid level gauges, improving the unit's reliability and safety.

[0046] Furthermore, the ingenious design of the top and bottom cylinders creates a sealed chamber with an incompressible fluid medium, enabling the top and bottom piston rods to move in unison. When high-pressure hydraulic oil enters Chamber III and pushes the top piston rod, the incompressibility of the fluid causes the bottom piston rod to move precisely in tandem, thus achieving precise displacement control of the drilling rig. This conversion of displacement accuracy from millimeters to micrometers significantly improves the drilling rig's sampling accuracy and operational efficiency.

[0047] Finally, the hydraulic valve allows the device to flexibly adjust the flow and pressure of the hydraulic oil according to actual needs, further enhancing the device's adaptability and control accuracy. The interconnected design between the filter and the cavity ensures the cleanliness of the hydraulic oil and extends the service life of the device.

[0048] In summary, the displacement generating device for the hydraulic direct-push drilling rig realizes precise displacement control of the drilling rig through reasonable structural design and efficient hydraulic oil circulation system, improves operation accuracy and efficiency, and has significant technical advantages and application value.

[0049] For further optimization, please refer to Figure 7a and Figure 7b; Bosses 1-1 and 1-2 are provided on the left and right sides of the upper surface of the body 1, which realize the modular integrated installation of the hydraulic valve, electric control box and motor device; the boss structure effectively utilizes the body space, making the overall layout more compact and reasonable; the boss 1-1 is connected to the hydraulic valve 23 and the electric control box 7 through the threaded hole 1-3, and the precise connection through the threaded holes not only ensures the stable installation of each component, but also facilitates subsequent disassembly and maintenance; the boss 1-2 is connected to the base 6-5 of the motor device 6 through the threaded hole 1-4, and the base 6-5 is fixed to the boss 1-2 by bolts 6-6; it ensures the stability and precision of the motor during operation and improves the overall performance of the device.

[0050] For further optimization, please refer to Figure 9a and Figure 9b The top cylinder body 22 is a cylindrical hollow structure with a rational and compact design, making it easy to assemble and maintain. Its upper flange 22-1 is connected to the top cylinder head 14 via bolts 13. The outer circumferential surface and hollow surface of the top cylinder head 14 are provided with several annular grooves for mounting the third sealing ring assembly 15, ensuring good sealing performance and preventing hydraulic oil leakage. The lower flange 22-2 is provided with an O-ring groove 22-3 and is sealed to the body 1 via an O-ring 37, further enhancing sealing reliability. The side of the top cylinder body 22 is provided with a threaded through-hole 22-4 and a boss 22-5. The boss 22-5 is connected to the sensor plate 20 via a threaded blind hole 22-6. The side threaded through-hole and boss design facilitate connection with components such as the sensor plate, enabling precise monitoring and control, and improving the overall performance and stability of the device.

[0051] For further optimization, please refer to Figure 10a and Figure 10b The bottom cylinder 26 is a cylindrical structure with an O-ring groove 26-2 on its upper surface, sealed to the machine body 1 via an O-ring 25. The bottom threaded through-hole 26-3 is sealed with a screw plug 38, and the side threaded through-hole 26-5 is connected to the circumferential oil passage 1-14 via a pipe. The O-ring sealing design ensures a good seal between the bottom cylinder and the machine body, preventing hydraulic oil leakage and improving device reliability. The screw plug seals the bottom threaded through-hole, facilitating maintenance and subsequent modification. The side threaded through-hole is connected to the circumferential oil passage, ensuring smooth hydraulic oil flow, stable operation of the power assist system, and reducing the risk of failure.

[0052] Furthermore, the front and rear recessed structures 1-8 of the housing 1 are connected to a sensing plate 24 via blind holes 1-19. The left-side horizontal oil passage 1-17 is connected to the T-port of a hydraulic valve 23 via a vertical oil passage 1-18, and is also equipped with a hydraulic oil filter 18. The connection of the front and rear recessed structures to the sensing plate provides a foundation for device displacement monitoring, enhancing operational status awareness. The left-side horizontal oil passage connects to the T-port of the hydraulic valve and is equipped with a filter, effectively filtering impurities from the hydraulic oil, ensuring hydraulic oil cleanliness, extending the device's service life, and improving system stability.

[0053] Further preferably, the bottom piston rod is provided with four groups 9, each coaxially mounted in the radial blind holes 1-11. Alternatively, more groups of piston rod assemblies or fewer piston rod assemblies and a bottom piston rod assembly with a larger effective working area may be used, which can further improve control accuracy. The bottom cylinder head 11 is connected to the threaded blind holes surrounding the blind holes 1-11 by bolts 12. The outer circumferential surface and hollow surface of the bottom cylinder head are provided with several annular grooves for mounting the second sealing ring assembly 10. The piston rod 9 is provided with several annular grooves circumferentially of the piston outer circle for mounting the first sealing ring assembly 8. The coaxial mounting of the bottom piston rod ensures smooth movement and precise positioning. The bolted connection between the bottom cylinder head and the blind hole facilitates installation and disassembly. The installation of the first sealing ring assembly 8 effectively prevents hydraulic oil leakage, ensures stable pressure in each cavity, improves the sealing and reliability of the device, and ensures precise displacement control of the drilling rig.

[0054] For further optimization, please refer to Figure 11a and Figure 11b The top block assembly 32 comprises a base plate 32-1, a top plate 32-2, and a guide sleeve 32-5. The base plate 32-1 is bolted to the bottom piston rod 9 via a through hole 32-8. The guide sleeve 32-5 includes a copper sleeve 29 that slides with the guide rod 4. The threaded blind hole 32-6 on the side of the base plate 32-1 is connected to the displacement sensor 28. This design structure of the top block assembly is reasonable. The base plate and the bottom piston rod are firmly connected to ensure stable power transmission. The guide sleeve cooperates with the guide rod to ensure the accurate movement direction of the top block assembly and reduce offset. The connection of the displacement sensor facilitates real-time monitoring of displacement, providing data support for precise control.

[0055] Further preferably, the guide rod 4 is inserted into the through hole 1-7 of the drill body 1 and secured to the drill body 1 via bolts 5. The guide hole 32-7 of the top block assembly 32 is coaxially aligned with the guide rod 4, and the copper sleeve 29 is secured to the guide sleeve 32-5 via bolts. The installation of the guide rod provides precise motion guidance for the top block assembly, ensuring its accurate motion trajectory and improving the accuracy of the drilling rig's displacement. The bolted connection ensures a secure connection between the guide rod and the drill body. The secure connection between the copper sleeve and the guide sleeve reduces friction, reduces wear, and extends the service life of the device.

[0056] Further preferably, chamber II is connected to port T of hydraulic valve 23 via lower horizontal oil passage 1-17 and vertical oil passage 1-18, chamber III is connected to port A of hydraulic valve 23 via threaded through-hole 22-4 on the side of top cylinder 22, and chamber IV is connected to port B of hydraulic valve 23 via circumferential oil passage 1-14. The rational connection between each chamber and hydraulic valve establishes an efficient hydraulic oil circulation system, ensuring accurate and rapid flow of hydraulic oil between chambers and achieving precise control of the top and bottom piston rods, thereby ensuring the accuracy of drilling rig displacement and improving the efficiency and quality of drilling operations.

[0057] Further preferably, the speed of motor 6-1 is set via electronic control box 7; the oil intake port 6-3 of hydraulic pump 6-2 is connected to the oil tank; the flat notch 16-1 of top piston rod 16 is connected to sensor plate 19 via threaded blind hole 16-2; and sensor plates 19, 24, and displacement sensor 28 are connected to electronic control box 7 via signal cables. The electronic control box sets the motor speed, allowing for flexible adjustment of the device's operating speed based on actual needs; the hydraulic pump's oil intake port is connected to the oil tank to ensure a supply of hydraulic oil; and the sensor plate and displacement sensor are connected to the electronic control box for signals, enabling real-time monitoring and precise control of the device's operating status, improving the device's automation and reliability.

[0058] In summary, the displacement generator for hydraulic direct-push drilling rigs of this invention significantly enhances the positioning and sampling capabilities of drilling systems through its highly integrated design, convenient installation, utilization of the incompressible properties of fluids, and high-precision displacement control. Its superior technical performance not only improves the device's reliability and installation efficiency but also provides strong support for precise sampling during drilling operations, promising broad application prospects and market value.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A displacement generating device for a hydraulic direct-push drilling rig, characterized in that: include: A machine body (1) of a quadrilateral structure is provided with a motor device (6), a hydraulic valve (23) and an electric control box (7) on its upper surface; The motor device (6) comprises a motor (6-1) and a hydraulic pump (6-2), wherein the oil outlet (6-4) of the hydraulic pump (6-2) is connected to the P port of the hydraulic valve (23) through a pipeline; a cylindrical protrusion (1-5) and a blind hole (1-6) are provided at the center of the upper surface of the body (1), a central blind hole (1-10) and radial blind holes (1-11) are provided at the lower surface, and radial oil passages (1-12), vertical oil passages (1-13), and circumferential oil passages (1-14) are provided inside. and horizontal oil passages (1-15, 1-16), wherein the upper horizontal oil passage (1-15) is connected to the air filter (35); the middle and lower horizontal oil passages (1-16) are connected to the liquid level gauge (36); a left side horizontal oil passage (1-17) is arranged along the lower surface central blind hole (1-10) toward the left side recessed structure, and an upper surface vertical oil passage (1-18) is arranged perpendicular to the left side horizontal oil passage (1-17) and communicated with the upper surface of the machine body (1); The top cylinder body (22) is connected to the cylindrical protrusion (1-5) by bolts, and the top piston rod (16) and the top cylinder cover (14) are coaxially arranged inside to form cavity III; The outer circle of the piston of the top piston rod (16) is provided with a sealing ring assembly (17), the end of the top piston rod (16) is connected to the sensor plate (20), and the sensor plate (20) is installed with a displacement sensor (21); The bottom cylinder (26) is connected to the central blind hole (1-10) by bolts to form a cavity II. A bottom piston rod (9) is provided in the bottom cylinder, and the end of the bottom piston rod is connected to a top block assembly (32) by a bolt (31); the top block assembly (32) is connected in series with the drilling mechanism of the drilling rig; A plane notch (26-4) and a side threaded through hole (26-5) are provided on the side of the bottom cylinder body. The side threaded through hole (26-5) is connected to a hydraulic pump (6-2) through a pipeline. The radial oil passage (1-12) is connected to the blind hole (1-6) and the radial blind hole (1-11). The vertical oil passage (1-13) is sealed by a plug (2, 3). The circumferential oil passage (1-14) forms a loop through pipelines (33, 34). The top cylinder body (22) and the top piston The rod (16), the body (1) and the bottom piston rod (9) form a sealed cavity I through an incompressible fluid medium (39); the radial blind hole (1-11), the bottom piston rod (9) and the bottom cylinder cover (11) form a cavity IV through hydraulic oil; the A port of the hydraulic valve (23) is connected to the cavity III through a pipeline, the B port is connected to the cavity IV through a pipeline, the T port is connected to the cavity II through a filter (18), and the oil suction port (6-3) of the hydraulic pump (6-2) is connected to the cavity II.

2. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: Bosses (1-1, 1-2) are provided on the left and right sides of the upper surface of the machine body (1); the boss (1-1) is connected to the hydraulic valve (23) and the electric control box (7) through a threaded hole (1-3); the boss (1-2) is connected to the base (6-5) of the motor device (6) through a threaded hole (1-4); and the base (6-5) is fixed to the boss (1-2) through bolts (6-6).

3. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: The top cylinder body (22) is a cylindrical hollow structure, and its upper flange (22-1) is connected to the top cylinder cover (14) by bolts (13). The outer surface and hollow surface of the top cylinder cover (14) are provided with a plurality of annular grooves, and the annular grooves are used to install the third sealing ring assembly (15); the lower flange (22-2) is provided with an O-ring groove (22-3) and is sealed with the body (1) by an O-ring (37); the side surface of the top cylinder body (22) is provided with a threaded through hole (22-4) and a boss (22-5); the boss (22-5) is connected to the sensor plate (20) through a threaded blind hole (22-6).

4. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: The bottom cylinder body (26) is a cylindrical structure, an O-ring groove (26-2) is provided on its upper surface and is sealed with the machine body (1) via an O-ring (25), and the bottom threaded through hole (26-3) is blocked by a screw plug (38).

5. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: The front and rear side recessed structures (1-8) of the machine body (1) are connected to the induction plate (24) through blind holes (1-19), the left side horizontal oil passage (1-17) is connected to the T-port of the hydraulic valve (23) through the vertical oil passage (1-18), and a hydraulic oil filter (18) is installed.

6. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: The bottom piston rod is provided with four groups (9) which are coaxially installed in the radial blind holes (1-11). The bottom cylinder cover (11) is connected to the threaded blind holes around the blind holes (1-11) through bolts (12). The outer surface and the hollow surface of the bottom cylinder cover are provided with a plurality of annular grooves, and the annular grooves are used to install the second sealing ring assembly (10); the outer circumferential direction of the piston of the piston rod (9) is provided with a plurality of annular grooves, and the annular grooves are used to install the first sealing ring assembly (8).

7. The displacement generating device for a hydraulic direct-push drilling rig according to claim 1, characterized in that: The top block assembly (32) comprises a bottom plate (32-1), a top plate (32-2) and a guide sleeve (32-5); the bottom plate (32-1) is bolted to the bottom piston rod (9) through a through hole (32-8); a copper sleeve (29) is provided inside the guide sleeve (32-5) and is slidably matched with the guide rod (4); a threaded blind hole (32-6) on the side of the bottom plate (32-1) is connected to a displacement sensor (28).

8. The displacement generating device for a hydraulic direct-push drilling rig according to claim 7, characterized in that: The guide rod (4) is installed in the through hole (1-7) of the machine body (1) and is fixed to the machine body (1) via a bolt (5); the guide hole (32-7) of the top block assembly (32) is coaxially matched with the guide rod (4); and the copper sleeve (29) is fixed to the guide sleeve (32-5) via a bolt.

9. The displacement generating device for a hydraulic direct-push drilling rig according to any one of claims 1 to 8, characterized in that: The cavity II is connected to the T port of the hydraulic valve (23) through the horizontal oil passage (1-17) and the vertical oil passage (1-18) on the left side, the cavity III is connected to the A port of the hydraulic valve (23) through the threaded through hole (22-4) on the side of the top cylinder (22), and the cavity IV is connected to the B port of the hydraulic valve (23) through the circumferential oil passage (1-14).

10. The displacement generating device for a hydraulic direct-push drilling rig according to claim 9, characterized in that: The rotation speed of the motor (6-1) is set via an electric control box (7); the plane notch (16-1) of the top piston rod (16) is connected to a sensing plate (19) via a threaded blind hole (16-2); and the sensing plate (19, 24) and the displacement sensor (21, 28) are connected to the electric control box (7) via signal lines.

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