Rock sample collecting device for geotechnical engineering investigation

Abstract

The invention relates to the field of geotechnical engineering equipment, and discloses a geotechnical engineering investigation rock sample collecting device which comprises two bases, the top ends of the bases are fixedly installed on the two sides of the bottom end of a supporting plate correspondingly, and vertical rods are fixedly installed on the two sides of the top end of the supporting plate correspondingly; a threaded rod is movably mounted in the middle of the bottom end of the transverse frame, the bottom end of the threaded rod is movably mounted in the middle of the top end of the supporting plate, the outer diameter of the threaded rod is in threaded connection to the middle of the rear end of the box body, an outer cylinder is movably mounted at the inner bottom of the box body, a middle cylinder is movably mounted in the inner middle of the box body, and the bottom end of the middle cylinder penetrates through the outer cylinder and extends to the position below the outer cylinder; and an inner cylinder is mounted in the middle cylinder through a positioning bearing. Core completeness is guaranteed through fracture prevention and buffer clamping design, pollution is reduced through an efficient cooling chip removal system, reliable operation of equipment is achieved in combination with overload protection and a stable structure, and sampling efficiency and sample quality are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical engineering equipment, in particular to a rock sample collection device for geotechnical engineering survey. Background Art

[0002] In geotechnical engineering, rock sample collection is a critical step in geological analysis and engineering design. With the continuous advancement of infrastructure construction, and the increase in large-scale projects such as bridges, tunnels, and high-rise buildings, higher requirements are being placed on the accuracy and efficiency of geotechnical engineering surveys. As the core equipment for obtaining raw data, the performance of rock sample collection devices directly affects sample quality and the reliability of engineering safety assessments. At present, traditional rock sample collection devices generally have the following technical bottlenecks. First, it is difficult to ensure the integrity of the core during the core collection process. Most devices use a rigid clamping method to extract the core. During the drilling and removal process, the core is easily broken or disintegrated due to rotational shear force or excessive clamping force. Especially when dealing with rocks with large hardness differences or developed stratification, the sample is severely damaged and cannot truly reflect the mechanical properties of the rock, affecting the accurate measurement of subsequent geological parameters. Second, the cooling and chip removal system is inefficient. Existing devices mostly rely on external high-pressure water flushing for cooling and chip removal. The water flow rate is difficult to accurately control, which often leads to excessive mud volume, which not only contaminates the core sample, but may also clog the drill hole and affect the drilling progress; some devices lack an effective chip removal mechanism, and the accumulation of debris can easily cause increased wear of the drill bit, reduce the service life of the equipment, and increase construction costs. Third, the equipment safety and adaptability are insufficient. When faced with high-hardness rocks, the power system of traditional devices is easily damaged by overload and lacks reliable protection measures; at the same time, the device's structural design is single and difficult to adapt to complex and changeable geological environments. It is inconvenient to operate in narrow spaces or areas with large terrain undulations, which limits its scope of application. Furthermore, existing collection devices have a low level of functional integration, with cooling, chip removal, and core collection processes operating independently and unable to work collaboratively. This results in cumbersome operational processes, frequent manual intervention, and reduced survey efficiency. Therefore, developing a rock sample collection device that can effectively protect core integrity, improve cooling and chip removal efficiency, provide overload protection, and adapt to various operating conditions has become a pressing technical challenge in geotechnical engineering surveys. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a rock sample collection device for geotechnical engineering surveys, which solves the problems of traditional rock sample collection devices such as easy core breakage, poor cooling and chip removal, easy equipment overload damage, and insufficient adaptability. Through innovative structural design, it achieves complete core collection, efficient cooling and chip removal, and equipment protection, thereby improving the efficiency and reliability of geotechnical engineering surveys.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A rock sample collection device for geotechnical engineering survey, comprising two bases, the top ends of the bases are respectively fixedly mounted on both sides of the bottom end of the support plate, and vertical rods are fixedly mounted on both sides of the top end of the support plate, and the top ends of the vertical rods are respectively fixedly mounted on both sides of the bottom end of the cross frame, a threaded rod is movably mounted in the middle of the bottom end of the cross frame, and the bottom end of the threaded rod is movably mounted in the middle of the top end of the support plate, the outer diameter of the threaded rod is threadedly connected to the middle of the rear end of the box body, an outer cylinder is movably mounted on the inner bottom of the box body, a middle cylinder is movably mounted in the inner middle of the box body, and the bottom end of the middle cylinder passes through the interior of the outer cylinder and extends below it, an inner cylinder is mounted inside the middle cylinder through a positioning bearing, a coring drill bit is fixedly mounted on the bottom end of the outer cylinder, a plurality of magnetic rings are evenly fixedly mounted on the outer diameter of the middle cylinder, aluminum rings are movably mounted at positions corresponding to each magnetic ring on the outer diameter of the outer cylinder, and spiral guide plates are fixedly mounted on the outer diameter of the aluminum rings.

[0005] Preferably, connecting arms are fixedly installed at both ends of the box body and the ends of the connecting arms are movably installed on the outer diameter of the vertical poles on the corresponding sides, and diagonal support rods are fixedly installed on both sides of the rear end of the horizontal frame and the bottom ends of the diagonal support rods are fixedly installed on the rear side of the top end of the base on the corresponding sides.

[0006] Preferably, the rear end of the base is fixedly mounted on both sides of the armrest, universal wheels are fixedly mounted on both sides of the bottom end of the base, and the top end of the threaded rod extends to the top of the cross frame and is fixedly mounted with a handwheel.

[0007] Preferably, an inner groove is formed at the inner bottom of the inner cylinder, a core claw is movably provided inside the inner groove, and a polyurethane buffer ring is fixedly installed at the inner end of the core claw.

[0008] Preferably, a three-phase asynchronous motor is fixedly mounted on one side of the top end of the box body, the driving end of the three-phase asynchronous motor extends to the interior of the box body and is fixedly mounted on a transmission shaft, a driving bevel gear is fixedly mounted on the upper outer diameter of the transmission shaft, a driven bevel gear is provided on the upper outer diameter of the middle cylinder, a compression spring is fixedly mounted on the outer diameter of the middle cylinder near the upper position of the driven bevel gear and the bottom end of the compression spring abuts against the top end of the driven bevel gear.

[0009] Preferably, a clamping plate is fixedly installed at a position below the outer diameter of the middle cylinder near the driven bevel gear, and a plurality of round head grooves are opened on the outer side of the top end of the clamping plate. A plurality of round head bayonet pins are evenly fixedly installed on the bottom end of the driven bevel gear and the ends of the round head bayonet pins extend to the inside of the round head groove on the corresponding side.

[0010] Preferably, a cylinder body is fixedly mounted on the lower outer diameter of the transmission shaft, an inclined ball groove is opened on the outer diameter of the cylinder body and an inclined bearing seat is movably mounted in the ball groove, a rocker arm is fixedly mounted on one end of the rocker arm and the end of the rocker arm is movably mounted on one side of the outer cylinder.

[0011] Preferably, a chamber is provided at the inner top of the inner cylinder, a cooling water inlet pipe is fixedly installed at the top of the chamber and the end of the cooling water inlet pipe extends to the outside of the box, water seepage holes are provided at both ends of the inner wall side of the chamber, a water trough is provided between the middle cylinder and the inner cylinder, outflow channels are provided on both sides of the interior of the core drill bit, the top of the outflow channel is connected to the interior of the water trough and the bottom end of the outflow channel is connected to the outside world.

[0012] The present invention provides a rock sample collection device for geotechnical engineering investigation. It has the following beneficial effects: 1. The present invention adopts a three-layer sleeve design of outer tube, middle tube and inner tube. The inner tube is connected to the middle tube by a positioning bearing. When the middle tube rotates, the inner tube remains stationary, avoiding the core from breaking due to the rotational shear force and effectively protecting the integrity of the core. A polyurethane buffer ring is set on the inner side of the core claw in the inner groove. When the core claw is automatically tightened after sampling is completed, the core is elastically squeezed by the buffer ring instead of rigidly clamped, preventing the end core from collapsing and improving the core integrity rate.

[0013] 2. The present invention introduces cooling water into the chamber through a cooling water inlet pipe, flows into the water tank through the seepage hole, and is then transported to the bottom of the drill bit through the outflow channel inside the core drill bit, thereby achieving real-time cooling of the drill bit, reducing high-temperature wear during the drilling process, and extending the service life of the drill bit. The cooling system can accurately control the water flow rate, reduce mud generation, avoid mud contamination of the sampled core, and ensure the cleanliness of the core sample and the accuracy of detection.

[0014] 3. This invention uses the magnetic ring to rotate as the inner cylinder rotates. Based on the principle of electromagnetic induction, the aluminum ring rotates with it under the Ampere force. A spiral guide plate on its outer diameter transports drill core waste upward. When the drive shaft rotates the cylinder, the inclined ball groove causes the inclined bearing seat to swing the outer cylinder up and down via a rocker, further pushing waste chips upward. This dual chip removal mechanism ensures smooth and immediate discharge of waste chips during sampling, preventing debris accumulation that could impact drilling efficiency.

[0015] 4. In the present invention, when the hardness of the drilled core is high and the middle cylinder stops rotating, the driven bevel gear will compress the compression spring, causing the round head pin and the round head groove to frequently disengage and engage, cutting off power transmission, avoiding damage to the three-phase asynchronous motor and the coring drill bit due to overload, and improving equipment reliability. Through the layered design of the outer cylinder, middle cylinder, inner cylinder and coring drill bit, combined with the coordinated work of components such as the magnetic ring, aluminum ring, spiral guide plate, transmission shaft, and cylinder body, the integrated integration of drilling, cooling, chip removal, core protection and other functions is realized, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention; Figure 2 Schematic diagram of the internal structure of the box in the present invention; Figure 3 Schematic diagram of the internal structure of the coring drill bit of the present invention; Figure 4 for Figure 2 Enlarged view of point A in the middle; Figure 5 for Figure 2 Enlarged view of point B in the middle; Figure 6 Schematic diagram of the internal structure of the chamber in the present invention.

[0017] Among them, 1. base; 2. support plate; 3. vertical pole; 4. cross frame; 5. threaded rod; 6. box body; 7. connecting arm; 8. diagonal support rod; 9. handrail; 10. universal wheel; 11. handwheel; 12. outer cylinder; 13. middle cylinder; 14. inner cylinder; 15. coring drill bit; 16. inner groove; 17. core claw; 18. polyurethane buffer ring; 19. magnetic ring; 20. aluminum ring; 21. spiral guide plate; 22. three-phase asynchronous motor; 23. transmission shaft; 24. driving bevel gear; 25. compression spring; 26. driven bevel gear; 27. clamping plate; 28. round head groove; 29. ​​round head bayonet; 30. cylinder body; 31. oblique bearing seat; 32. rocker arm; 33. chamber; 34. cooling water inlet pipe; 35. seepage hole; 36. water tank; 37. outflow channel. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. 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.

[0019] Example: Please see the attached Figure 1 -Attached Figure 6 The present invention provides a rock sample collection device for geotechnical engineering investigation, such as Figure 1As shown, the device comprises two bases 1, the tops of which are fixedly mounted on either side of the bottom of a support plate 2. The bases 1 are rectangular plates and are bolted to the bottom surfaces of the support plates 2, forming the bottom support structure of the device. Vertical poles 3 are fixedly mounted on either side of the top of the support plates 2. The support plates 2 are horizontally arranged steel plates, and the vertical poles 3 are vertically welded to either side of the top to form vertical support columns. The tops of the vertical poles 3 are fixedly mounted on either side of the bottom of a cross frame 4. The tops of the vertical poles 3 are connected to the cross frame 4 via flanges. The cross frame 4 spans the tops of the two vertical poles 3, forming a portal-shaped frame. A threaded rod 5 is movably installed in the middle of the bottom end of the cross frame 4, and the bottom end of the threaded rod 5 is movably installed in the middle of the top end of the support plate 2. The threaded rod 5 passes through the bearing seat in the middle of the cross frame 4, and the bottom end is connected to the support plate 2 through a rotating seat, and can rotate around its own axis. The outer diameter of the threaded rod 5 is threadedly connected to the middle of the rear end of the box body 6. A threaded hole is provided at the rear end of the box body 6 to cooperate with the threaded rod 5. When the threaded rod 5 rotates, it can drive the box body 6 to rise and fall. An outer cylinder 12 is movably installed on the inner bottom of the box body 6. The outer cylinder 12 is installed on the inner bottom of the box body 6 through a bearing and can rotate around the vertical axis. The middle part of the box body 6 is movably installed with a middle cylinder 13 and the bottom end of the middle cylinder 13 passes through the interior of the outer cylinder 12 and extends below it. The middle cylinder 13 is located inside the outer cylinder 12, and the bottom end extends out of the bottom of the outer cylinder 12 to form a nested rotating structure. The inner cylinder 14 is installed inside the middle cylinder 13 through a positioning bearing. The inner cylinder 14 is connected to the inner wall of the middle cylinder 13 through a positioning bearing and can remain stationary. The bottom end of the outer cylinder 12 is fixedly installed with a core drill bit 15. The core drill bit 15 is a cylindrical drilling component that is fixed to the bottom of the outer cylinder 12 by bolts. The end is used for drilling cores. Several magnetic rings 19 are evenly fixedly installed on the outer diameter of the middle cylinder 13. The magnetic rings 19 are equidistantly distributed on the outer periphery of the middle cylinder 13 and rotate synchronously with the middle cylinder 13. Aluminum rings 20 are movably installed at the position corresponding to each magnetic ring 19 on the outer diameter of the outer cylinder 12. The aluminum rings 20 are sleeved on the outside of the outer cylinder 12, corresponding to the position of the magnetic rings 19, and can rotate freely. A spiral guide plate 21 is fixedly installed on the outer diameter of the aluminum ring 20. The spiral guide plate 21 is spirally fixed to the outer periphery of the aluminum ring 20 for transporting drilling waste.

[0020] In this embodiment, connecting arms 7 are fixedly installed at both ends of the box body 6 and the ends of the connecting arms 7 are movably installed on the outer diameter of the corresponding side uprights 3. The connecting arms 7 are L-shaped structures, one end is welded to both sides of the box body 6, and the other end is slidably connected to the uprights 3 through a shaft sleeve to limit the radial displacement of the box body 6 during lifting and lowering. Diagonal support rods 8 are fixedly installed on both sides of the rear end of the cross frame 4 and the bottom ends of the diagonal support rods 8 are fixedly installed on the rear side of the top end of the corresponding side base 1. The diagonal support rods 8 are tilted and the two ends are welded to the cross frame 4 and the base 1 respectively to enhance the stability of the frame structure.

[0021] The rear end of the base 1 is fixedly mounted on both sides of the handrail 9. The handrail 9 is a U-shaped steel pipe, and both ends are welded to the rear end of the base 1 to facilitate the staff to push the device to move. Universal wheels 10 are fixedly mounted on both sides of the bottom end of the base 1. The universal wheels 10 are fixed to the bottom end of the base 1 by bolts and can rotate 360° to achieve flexible movement of the device. The top end of the threaded rod 5 extends to the top of the cross frame 4 and is fixedly mounted with a handwheel 11. The handwheel 11 is fixed to the top of the threaded rod 5. The staff rotates the handwheel 11 to drive the threaded rod 5 to rotate.

[0022] An inner groove 16 is provided at the inner bottom of the inner cylinder 14. The inner groove 16 is located at the center of the bottom of the inner cylinder 14 and is used to accommodate a core claw 17. A core claw 17 is movably provided inside the inner groove 16. The core claw 17 is composed of a plurality of arc-shaped steel sheets, which are hinged to the inner wall of the inner groove 16 and can be retracted inward to clamp the core. A polyurethane buffer ring 18 is fixedly installed at the inner end of the core claw 17. The polyurethane buffer ring 18 is adhered to the inner side of the core claw 17 to prevent the core from being rigidly damaged by elastic extrusion.

[0023] A three-phase asynchronous motor 22 is fixedly installed on one side of the top of the box body 6. The three-phase asynchronous motor 22 is fixed to the top of the box body 6 through a bracket to provide power for the device. The driving end of the three-phase asynchronous motor 22 extends to the interior of the box body 6 and is fixedly installed with a transmission shaft 23. The transmission shaft 23 is connected to the output shaft of the motor and passes through the top of the box body 6 to transmit rotational power. A driving bevel gear 24 is fixedly installed on the outer diameter of the upper side of the transmission shaft 23. The driving bevel gear 24 is fixed on the upper part of the transmission shaft 23 and is connected to the driven bevel gear 24. The gear 26 is engaged for transmission. A driven bevel gear 26 is provided on the outer diameter of the upper side of the middle cylinder 13. The driven bevel gear 26 is sleeved on the upper part of the middle cylinder 13 and meshes with the driving bevel gear 24 to drive the middle cylinder 13 to rotate. A compression spring 25 is fixedly installed on the outer diameter of the middle cylinder 13 near the upper position of the driven bevel gear 26, and the bottom end of the compression spring 25 abuts against the top end of the driven bevel gear 26. One end of the compression spring 25 is fixed to the middle cylinder 13, and the other end presses the driven bevel gear 26 to ensure that the bevel gears are tightly engaged.

[0024] A clamping plate 27 is fixedly installed at a position below the driven bevel gear 26 on the outer diameter of the middle cylinder 13. The clamping plate 27 is an annular plate fixed to the outer periphery of the middle cylinder 13 and located below the driven bevel gear 26. A plurality of round head grooves 28 are opened on the outer side of the top of the clamping plate 27. The round head grooves 28 are evenly distributed on the top of the clamping plate 27 and are used to cooperate with round head bayonet pins 29. A plurality of round head bayonet pins 29 are evenly fixedly installed on the bottom end of the driven bevel gear 26, and the ends of the round head bayonet pins 29 extend into the inside of the round head grooves 28 on the corresponding side. The round head bayonet pins 29 are fixed to the bottom end of the driven bevel gear 26 and inserted into the round head grooves 28 to form a clamping structure to transmit torque. When the hardness of the drilled core is high, the middle cylinder 13 stops rotating. At this time, the three-phase asynchronous motor 22 drives the transmission shaft 23 and the active bevel gear 24 to rotate. At this time, the rotating driven bevel gear 26 compresses the compression spring 25, causing the round head groove 28 and the round head bayonet 29 to continuously disengage and engage. At this time, the driven bevel gear 26 no longer applies a rotational force to the middle cylinder 13, which can protect the three-phase asynchronous motor 22 and the coring drill bit 15.

[0025] A cylinder body 30 is fixedly mounted on the outer diameter of the lower side of the transmission shaft 23. The cylinder body 30 is fixed to the lower part of the transmission shaft 23 and rotates synchronously with the transmission shaft 23. An inclined ball groove is provided on the outer diameter of the cylinder body 30 and an oblique bearing seat 31 is movably mounted in the ball groove. The ball groove is obliquely opened on the outer periphery of the cylinder body 30. The oblique bearing seat 31 contacts the ball groove through the balls and can slide along the groove. A rocker arm 32 is fixedly mounted on one end of the oblique bearing seat 31 and the end of the rocker arm 32 is movably mounted on one side of the outer cylinder 12. The two ends of the rocker arm 32 are respectively hinged to the oblique bearing seat 31 and the outer cylinder 12, thereby converting the sliding of the oblique bearing seat 31 into the up and down swinging of the outer cylinder 12.

[0026] Specifically, the rotating middle cylinder 13 will drive all the magnetic rings 19 on the outer diameter to rotate. When the magnetic ring 19 rotates, the magnetic flux of the aluminum ring 20 will change. According to the principle of electromagnetic induction, the aluminum ring 20 will be affected by the Ampere force at this time, and the magnetic ring 19 will rotate along with the direction of movement of the magnetic field. When the aluminum ring 20 rotates, it will drive the spiral guide plate 21 on the outer diameter to rotate, thereby transporting the waste chips generated during the core drilling process upward, and when the transmission shaft 23 rotates, it will also drive the cylinder body 30 to rotate. Since there is a certain angle between the ball groove on the outer diameter of the cylinder body 30 and the central axis of the cylinder body 30, when the cylinder body 30 rotates, it will drive the inclined bearing seat 31 outside the ball groove to swing the axis, and then through the action of the rocker arm 32, it will drive the outer cylinder 12 to swing up and down, and transport the waste chips upward again, thereby realizing real-time and smooth chip removal during the sampling process.

[0027] Furthermore, a chamber 33 is provided at the inner top of the inner cylinder 14. The chamber 33 is located at the top of the inner cylinder 14 and is used to store cooling water. A cooling water inlet pipe 34 is fixedly installed at the top of the chamber 33 and the end of the cooling water inlet pipe 34 extends to the outside of the box body 6. The cooling water inlet pipe 34 is connected to an external water source to introduce cooling water into the chamber 33. Water seepage holes 35 are provided at both ends of the inner wall side of the chamber 33. The water seepage holes 35 are located on the side walls of the chamber 33, so that the cooling water flows into the water trough 36. A water trough 36 is provided between the middle cylinder 13 and the inner cylinder 14. The water trough 36 is an annular space located between the middle cylinder 13 and the inner cylinder 14 to store cooling water. Outflow channels 37 are provided on both sides of the interior of the core drill bit 15. The top of the outflow channel 37 is connected to the interior of the water trough 36 and the bottom end of the outflow channel 37 is connected to the outside world. The outflow channel 37 runs through the core drill bit 15 and guides the cooling water in the water trough 36 to the bottom of the drill bit to achieve a cooling function.

[0028] Working principle: First, move the device to the sampling area through the handrail 9 and the universal wheel 10, then start the three-phase asynchronous motor 22, and drive the transmission shaft 23 to rotate through the three-phase asynchronous motor 22, driving the active bevel gear 24 to rotate, and the rotating active bevel gear 24 drives the driven bevel gear 26 and the middle cylinder 13 to rotate, thereby driving the coring drill bit 15 at the bottom end of the middle cylinder 13 to rotate, and then the staff rotates the handwheel 11, and drives the threaded rod 5 to rotate through the handwheel 11, and utilizes the limiting effect of the connecting arm 7 and the vertical pole 3 to drive the box 6 to descend, thereby driving the rotating coring drill bit 15 to descend, and start the core sampling work. The drilled core will push the core claw 17 into the inner groove 16 and enter the interior of the inner cylinder 14, and the inner cylinder 14 passes The positioning bearing is connected to the middle cylinder 13, so it will not rotate along with the rotation of the middle cylinder 13, which can avoid the generation of rotational shear force that causes core fracture. At this time, cooling water is introduced through the cooling water inlet pipe 34, and the cooling water enters the chamber 33, and then flows into the water tank 36 through the seepage hole 35, and finally flows to the bottom of the coring drill bit 15 through the outflow channel 37, so as to realize real-time cooling of the coring drill bit 15. At the same time, it is easier to control the water flow to reduce the generation of mud, thereby avoiding mud contamination of the sampled core. In the process of drilling the core, the rotating middle cylinder 13 will drive all the magnetic rings 19 on the outer diameter to rotate. When the magnetic ring 19 rotates, it will cause the magnetic flux of the aluminum ring 20 to change. According to the principle of electromagnetic induction, the aluminum ring 20 will be affected by the Ampere force and follow the direction of magnetic field movement to rotate the magnetic ring 19. When the aluminum ring 20 rotates, it will drive the spiral guide plate 21 on the outer diameter to rotate, thereby transporting the waste chips generated in the core drilling process upward, and when the transmission shaft 23 rotates, it will also drive the cylinder body 30 to rotate. Since there is a certain angle between the ball groove on the outer diameter of the cylinder body 30 and the central axis of the cylinder body 30, when the cylinder body 30 rotates, it will drive the inclined bearing seat 31 outside the ball groove to swing the axis, and then through the action of the rocker 32, drive the outer cylinder 12 to swing up and down, and transport the waste chips upward again, thereby realizing real-time and smooth chip removal during the sampling process. After completing the core sampling work, the staff rotates the handwheel 11 in the opposite direction to drive the box body 6 and the middle cylinder 13 to move upward. When the core is lifted up, the core claw 17 slides out of the inner groove 16 and automatically tightens, driving the polyurethane buffer ring 18 to retract and clamp the core. The elastic squeezing of the polyurethane buffer ring 18 rather than the rigid clamping of the core can avoid the collapse of the terminal core and improve the core integrity rate. When the hardness of the drilled core is high, the middle cylinder 13 stops rotating. At this time, the three-phase asynchronous motor 22 drives the transmission shaft 23 and the active bevel gear 24 to rotate. At this time, the rotating driven bevel gear 26 will compress the compression spring 25, so that the round head groove 28 and the round head bayonet 29 will be continuously disengaged and engaged. At this time, the driven bevel gear 26 no longer applies a rotational force to the middle cylinder 13, which can protect the three-phase asynchronous motor 22 and the coring drill bit 15.

[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rock sample collection device for geotechnical engineering investigation, comprising two bases (1), characterized in that: The top of the base (1) is fixedly mounted on both sides of the bottom of the support plate (2), and both sides of the top of the support plate (2) are fixedly mounted with vertical rods (3). The tops of the vertical rods (3) are fixedly mounted on both sides of the bottom of the cross frame (4). A threaded rod (5) is movably mounted in the middle of the bottom of the cross frame (4), and the bottom of the threaded rod (5) is movably mounted in the middle of the top of the support plate (2). The outer diameter of the threaded rod (5) is threadedly connected to the middle of the rear end of the box (6). The inner bottom of the box (6) is movably mounted with an outer cylinder (12). The inner bottom of the box (6) A middle cylinder (13) is movably mounted in the middle portion, and the bottom end of the middle cylinder (13) passes through the interior of the outer cylinder (12) and extends to the bottom thereof; an inner cylinder (14) is mounted inside the middle cylinder (13) via a positioning bearing; a core drill bit (15) is fixedly mounted at the bottom end of the outer cylinder (12); a plurality of magnetic rings (19) are evenly and fixedly mounted on the outer diameter of the middle cylinder (13); aluminum rings (20) are movably mounted at positions corresponding to each magnetic ring (19) on the outer diameter of the outer cylinder (12); and spiral guide plates (21) are fixedly mounted on the outer diameter of each aluminum ring (20).

2. The rock sample collection device for geotechnical engineering investigation according to claim 1, characterized in that: Connecting arms (7) are fixedly mounted on both ends of the box (6), and the ends of the connecting arms (7) are movably mounted on the outer diameters of the vertical poles (3) on the corresponding sides. Diagonal braces (8) are fixedly mounted on both sides of the rear end of the horizontal frame (4), and the bottom ends of the diagonal braces (8) are fixedly mounted on the rear side of the top end of the base (1) on the corresponding sides.

3. The rock sample collection device for geotechnical engineering investigation according to claim 1, characterized in that: The rear ends of the base (1) are fixedly mounted on both sides of the handrail (9), and universal wheels (10) are fixedly mounted on both sides of the bottom end of the base (1). The top end of the threaded rod (5) extends to the top of the cross frame (4) and is fixedly mounted with a hand wheel (11).

4. The rock sample collection device for geotechnical engineering investigation according to claim 1, characterized in that: An inner groove (16) is provided at the inner bottom of the inner cylinder (14), a core claw (17) is movably provided inside the inner groove (16), and a polyurethane buffer ring (18) is fixedly installed at the inner end of the core claw (17).

5. The rock sample collection device for geotechnical engineering investigation according to claim 1, characterized in that: A three-phase asynchronous motor (22) is fixedly mounted on one side of the top end of the housing (6), a driving end of the three-phase asynchronous motor (22) extends into the interior of the housing (6) and is fixedly mounted with a transmission shaft (23), a driving bevel gear (24) is fixedly mounted on the upper outer diameter of the transmission shaft (23), a driven bevel gear (26) is provided on the upper outer diameter of the middle cylinder (13), a compression spring (25) is fixedly mounted on the outer diameter of the middle cylinder (13) near the upper position of the driven bevel gear (26), and the bottom end of the compression spring (25) contacts the top end of the driven bevel gear (26).

6. The rock sample collection device for geotechnical engineering investigation according to claim 5, characterized in that: A clamping plate (27) is fixedly mounted on the outer diameter of the middle cylinder (13) at a position below the driven bevel gear (26), and a plurality of round head grooves (28) are provided on the outer side of the top end of the clamping plate (27). A plurality of round head bayonet pins (29) are evenly fixedly mounted on the bottom end of the driven bevel gear (26), and the ends of the round head bayonet pins (29) extend to the inside of the round head grooves (28) on the corresponding side.

7. The rock sample collection device for geotechnical engineering investigation according to claim 5, characterized in that: A cylinder body (30) is fixedly mounted on the outer diameter of the lower side of the transmission shaft (23), an inclined ball groove is provided on the outer diameter of the cylinder body (30), and an inclined bearing seat (31) is movably mounted in the ball groove, a rocker arm (32) is fixedly mounted on one end of the rocker arm (32), and a distal end of the rocker arm (32) is movably mounted on one side of the outer cylinder (12).

8. The rock sample collection device for geotechnical engineering investigation according to claim 1, characterized in that: A chamber (33) is provided at the inner top of the inner cylinder (14), a cooling water inlet pipe (34) is fixedly installed at the top of the chamber (33), and the end of the cooling water inlet pipe (34) extends to the outside of the box (6), water seepage holes (35) are provided at both ends of the inner wall side of the chamber (33), a water trough (36) is provided between the middle cylinder (13) and the inner cylinder (14), and outflow channels (37) are provided on both sides of the interior of the core drill bit (15), the top end of the outflow channel (37) is connected to the inside of the water trough (36), and the bottom end of the outflow channel (37) is connected to the outside.

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