A sampling device for engineering geological surveying

Abstract

This invention discloses a sampling device for engineering geological exploration, relating to the field of geological exploration technology. It includes a frame on which a core drilling tool and a first driving component are mounted. An inner cylinder is detachably connected to the core drilling tool. A transmission ring is located within the inner cylinder, and a support is located within the transmission ring. Several driven wheels are rotatably connected to the support. The first driving component is connected to the driving wheels. The support is used to limit the shape and position of the transmission ring via the driven wheels. Several driving wheels are located on the outer circumferential wall of the transmission ring, and the driving wheels are used to rotate the transmission ring. A second driving component is also located within the inner cylinder, which drives the driving wheels to rotate. The transmission wheels are used to clamp the core sample. A storage component is located above the transmission ring, used to store the core sample and reduce collision damage between the core sample and the inner cylinder caused by core sample displacement.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a sampling device for engineering geological exploration. Background Technology

[0002] In engineering geological exploration, obtaining intact core samples is the most direct means of acquiring crucial information such as lithology, structure, mechanical parameters, and hydrogeological conditions of the formation. The quality of these core samples directly affects the accuracy of engineering geological assessments and the reliability of engineering designs. Core sampling is essentially a complex process of dynamic interaction between the rock mass and the drilling tool system. Its success depends not only on the performance of the drilling tool itself but also on the optimized matching of drilling parameters and the complexity of the formation conditions. In this process, the entire trajectory and state of the core sample from its formation at the bottom of the drill bit, through its entry into the drill string, until its safe capture constitutes the core element of the core sampling operation.

[0003] Core drilling tools have evolved to form a diverse system designed to adapt to different geological conditions. Single-layer core drilling tools have the simplest structure, but their inherent drawback lies in the lack of basic protection for the core. During core formation, the core is continuously subjected to direct erosion by drilling fluid and mechanical wear caused by the rotation of the drill string, resulting in severe degradation of its quality. It is almost impossible to obtain representative undisturbed rock samples, and the core extraction efficiency is extremely low.

[0004] To overcome this defect, conventional techniques often use double-tube coring tools, which separate the core from the drilling fluid and the rotating outer tube by adding an inner tube, significantly improving the core quality. However, ideally, the core should remain intact and slide straight into the inner tube. However, in reality, the core's posture is extremely prone to instability. When its length-to-diameter ratio is too large, it may buckle longitudinally under axial thrust, leading to point contact with the pipe wall and causing huge local friction. This is the direct cause of blockage. Especially in hard rock or fractured strata, core columns with uneven size or cracks are very likely to get stuck in each other when entering the inner tube, forming a "self-locking" blockage. Once this happens, the core stops entering, and its bottom will be blocked and eroded by subsequent drilling, resulting in a sharp drop in the core recovery rate and seriously affecting the quality of the final core obtained. At the same time, the core chuck device, which mainly relies on material clamping or spring clamping to restrict the movement of the core, is affected by multiple factors. Improper timing can easily lead to premature breakage or the risk of "core dropping" when lifting the drill, which greatly reduces the success rate of core extraction. Summary of the Invention

[0005] The purpose of this invention is to provide a sampling device for engineering geological exploration to solve the above-mentioned problems.

[0006] This invention is achieved through the following technical solution:

[0007] A sampling device for engineering geological exploration includes a frame, on which a core drilling tool and a first driving component are mounted. The core drilling tool is used to drill rock cores, and the first driving component is used to drive the core drilling tool to work. An inner cylinder is detachably connected inside the core drilling tool. A transmission ring is provided inside the inner cylinder and is coaxially arranged with the core drilling tool. A bracket is provided inside the transmission ring, and several driven wheels are rotatably connected to the bracket. The bracket is used to limit the shape and position of the transmission ring through the driven wheels. Several driving wheels are provided on the outer circumferential wall of the transmission ring, and the driving wheels are used to drive the transmission ring to rotate. A second driving component is also provided inside the inner cylinder, and the second driving component is used to drive the driving wheels to rotate. The transmission ring is used to clamp the rock core. A storage component is also provided above the transmission ring for storing the rock core.

[0008] The system also includes a control system. This control system is used to acquire the drilling depth and speed of the core drilling tool, as well as the speed of the drive wheel. It also receives user-inputted fault and fracture locations at the acquisition point. After the first drive unit operates, it controls the second drive unit to make the rotation speed of the transmission ring equal to the drilling speed of the core drilling tool. Only when the difference between the drilling depth and either the fault or fracture location is less than a set threshold is it determined that a fracture or fault has appeared on the acquired core. The system then controls the output power of the drive wheel on either side corresponding to the second drive unit to change, and simultaneously controls the storage component to operate, completing the core acquisition and fixation. In this solution, the transmission ring is designed to guide and restrict the direction of core movement, reducing the risk of core collision and damage caused by deviation during core formation.

[0009] Furthermore, the transmission ring includes an elastic ring, and the outer wall of the elastic ring is provided with a plurality of fixed teeth, which are used to increase the contact area between the transmission ring and the drive wheel.

[0010] Furthermore, the storage component includes several limiting clamps and several heat-sealing films. The limiting clamps are arranged along the axis of the inner cylinder. Several rotating rods are also provided on both sides of the limiting clamps. The rotating rods are used to change the movement direction of the heat-sealing films. The limiting clamps are made of elastic material, and a magnetic strip is provided on the side wall of the limiting clamps near the rock core. The magnetic strip is used to close the limiting clamps. A heating component is also provided on the limiting clamps. The heating component is used to heat the heat-sealing films to the melting temperature. After the heat-sealing films melt, they become a sleeve. The sleeve is used to wrap the rock core. The second driving component is also used to drive the heat-sealing films to move upward. The heat-sealing films are used to drive the rock core to move upward. The control system is also used to control the operation of the heating component and the second driving component according to the fault location or fracture location.

[0011] Furthermore, a limiting film is wrapped around the heat-sealing film at a position away from the axis of the inner cylinder. The melting point of the limiting film is higher than that of the heat-sealing film, and the limiting film is used to restrict the movement direction of the heat-sealing film.

[0012] Furthermore, the limiting clamp is also provided with a strain gauge, which is used to obtain the deformation information of the limiting clamp. The control system is also used to determine whether the rock core is fractured based on the deformation information, and to control the second driving component to work only after determining that the rock core is fractured.

[0013] Furthermore, the bracket is made of a rigid material, and the inner sidewall of the elastic ring is provided with several transmission teeth. The driven wheel is connected to the elastic ring through the transmission teeth, and the driving wheel is connected to the elastic ring through the fixed teeth. The outer sidewalls of both the driven wheel and the driving wheel are provided with elastic material pads. Several first permanent magnets are provided on the pads of the driven wheel and the driving wheel, and second permanent magnets are provided on all tooth surfaces of the transmission teeth and the fixed teeth. The magnetic fields of adjacent second permanent magnets are arranged alternately. The driving wheel drives the transmission ring to rotate through the first permanent magnets and the second permanent magnets.

[0014] Furthermore, the limiting clamp includes two elastic strips symmetrically arranged along the axis of the inner cylinder, and the heating assembly includes several welding strips. One of the elastic strips is located near the axis of the inner cylinder, and the other elastic strip is equipped with several AC coils. The AC coils and the welding strips closest to them constitute a heating unit. The AC coils are used to generate an alternating electric field, which induces eddy currents only within the welding strips of the same heating unit. The welding strips are used to heat and melt the heat-sealing film through the eddy currents. Compared to existing technologies, this solution can adjust the heating position in real time according to the deformation state of the limiting clamp, thus achieving plastic sealing of the core.

[0015] Furthermore, the control system is also used to acquire changes in the magnetic field environment of the area where the elastic strip is located, and to determine whether eddies are generated inside the welding strip based on the changes in the magnetic field environment. The system also acquires the cross-sectional dimensions of the core based on the position of the welding strip where the eddies are generated, and determines whether the core has been displaced based on the changes in the cross-sectional dimensions. The system only sends the order of the cores to the user after the cores have been displaced.

[0016] Furthermore, the control system is also used to obtain the actual size of the core input by the user, and after obtaining the cross-sectional size, calculate the difference between the cross-sectional size and the actual size. Only when the difference is greater than a set threshold is the core sampling abnormality determined and a prompt message sent to the user.

[0017] Furthermore, all the welding rods are made of materials that are good conductors of electricity.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. In this invention, the design of the transmission ring guides and fixes the core entering the drill pipe. Compared with the existing technology that uses drilling pressure to guide and collect the core into the drill pipe, this solution can avoid blockage inside the drill pipe caused by core fracture or tilting, which would hinder the entry of subsequent cores. This avoids the situation where the core is crushed and loses its representativeness. At the same time, the design of the transmission ring also enables this solution to actively guide the core to fracture at the location where there may be cracks or faults, and then encapsulate it. Compared with the existing technology, this solution can further avoid the problem of core fracture inside the drill pipe that may hinder the entry of subsequent cores in the traditional solution. At the same time, since the core is initially cut, it can also reduce the overall workload of the operators during the coring process to a certain extent.

[0020] 2. Compared with existing technologies, the limiting clamp and heat sealing film set in this solution can simultaneously seal the rock core during the coring process. Compared with existing technologies, this solution can significantly reduce the volatilization and oxidation of easily volatile and easily oxidized components in the rock strata during the coring process, which would otherwise lead to a decrease in the representativeness of the rock core. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a front cross-sectional view of the drill pipe portion in this invention;

[0023] Figure 2 This is a top cross-sectional view of the drill pipe portion in this invention;

[0024] Figure 3 This is a schematic diagram of the transmission ring portion in Embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the bracket in Embodiment 1 of the present invention;

[0026] Figure 5 This is a front view of the transmission ring in Embodiment 2 of the present invention;

[0027] Figure 6 for Figure 5 A schematic diagram of the AA direction.

[0028] The reference numerals in the attached drawings represent: 1. Drill pipe; 2. Inner cylinder; 3. Core; 4. Drive ring; 41. Fixed tooth; 42. Drive tooth; 5. Drive wheel; 6. Support; 61. Driven wheel; 7. Storage assembly; 71. Limiting clamp; 72. Heat sealing film; 73. Rotating rod; 8. Reel. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.

[0030] Example 1

[0031] like Figures 1 to 4 As shown, this embodiment includes a frame and a first drive unit. The frame is equipped with a core drilling tool, which is used to drill rock core 3. The core drilling tool includes a drill rod 1, and a core drill bit is provided below the drill rod 1.

[0032] The first driving component is used to drive the core drilling tool to work. The first driving component includes a rotary head and a winch. Both the rotary head and the winch are mounted on the frame. The output end of the rotary head is connected to the drill rod 1 through a coupling. The winch is equipped with a wire rope, and the wire rope is detachably connected to the drill rod 1 through a lifting device.

[0033] The drill rod 1 is detachably connected to an inner cylinder 2, which can rotate synchronously with the drill rod 1. The inner cylinder 2 contains a transmission ring 4, which includes an elastic ring. The diameter of the inner circumference of the elastic ring is slightly smaller than the diameter of the core 3 that the core drill bit can obtain. The elastic ring is coaxially arranged with the drill rod 1. Several fixed teeth 41 are integrally formed on the outer wall of the elastic ring. The transmission ring 4 is coaxially arranged with the drill rod 1. A bracket 6 is provided inside the transmission ring 4. In this embodiment, the bracket 6 is welded and fixed to the inner wall of the inner cylinder 2, and several driven wheels 61 are rotatably connected to the bracket 6. Several drive wheels 5 are provided on the outer circumferential wall of the transmission ring 4. A second driving component is also provided inside the inner cylinder 2. The second driving component is used to drive the driving wheel 5 to rotate. The second driving component is connected to the driving wheel 5 through a transmission shaft. In this embodiment, the transmission shaft is a flexible shaft. In this embodiment, the second driving component includes several transmission motors, and all transmission motors are fixedly connected to the inner sidewall of the inner cylinder 2 by bolts. Any one transmission motor is connected to the storage component 7, and the remaining transmission motors are connected to the driving wheel 5 through a flexible shaft. The driven wheel 61 is used to limit the shape and position of the transmission ring 4. The driving wheel 5 is used to drive the transmission ring 4 to rotate. The transmission ring 4 is used to clamp the rock core 3. A storage component 7 is also provided above the transmission ring 4. The storage component 7 is used to store the rock core 3.

[0034] The storage assembly 7 includes several limiting clamps 71 and several heat-sealing films 72. The limiting clamps 71 are arranged vertically along the axis of the inner cylinder 2. Several rotating rods 73 are also provided on both sides of the limiting clamps 71. The rotating rods 73 are used to change the movement direction of the heat-sealing films 72. The limiting clamps 71 are made of elastic material, and several magnetic strips are provided on the side wall of the limiting clamps 71 near the core 3. The magnetic strips are embedded in the side wall of the limiting clamps 71 and are used to close the limiting clamps 71. The limiting clamps 71 are also provided with a heating assembly, which is used to heat the heat-sealing films 72 to a melting point. The heating component consists of several heating wires, with at least one set of heating wires positioned at the end of the limiting clamp 71. This set of heating wires continuously heats the edge of the heat-sealing film 72, causing it to melt and become a sleeve. The sleeve is used to wrap the core 3. The second driving component is also used to drive the heat-sealing film 72 upward via a roller 8. The heat-sealing film 72 drives the core 3 upward. One end of the roller 8 is rotatably connected to the inner cylinder 2, and the other end of the roller 8 is connected to the output end of any drive motor that is not driven by a flexible shaft.

[0035] The limiting clamp 71 is also provided with a strain gauge, which is used to obtain the deformation information of the limiting clamp 71.

[0036] The heat-sealing film 72 is wrapped with a limiting film at a position away from the axis of the inner cylinder 2. The melting point of the limiting film is greater than that of the heat-sealing film 72. The limiting film is used to restrict the movement direction of the heat-sealing film 72.

[0037] It also includes a control system, which is used to acquire the drilling depth of the coring drill and the speed of the drive wheel 5. The control system includes a linear displacement sensor, a torque sensor and a controller. The strain gauge, rotary head, winch, drive motor, displacement sensor, heating wire and torque sensor are all electrically connected to the controller. The linear displacement sensor is mounted on the frame and is used to acquire the length of the drill rod 1 at the bottom surface. The torque sensor is mounted inside the inner cylinder 2 and is used to acquire the rotation speed of the drive wheel 5.

[0038] The controller is used to obtain the drilling depth based on the length of the drill rod 1 remaining on the ground and the length of the drill rod 1 obtained by the linear displacement sensor, and to obtain the surface speed of the drive wheel 5 based on the rotation speed and size of the drive wheel 5. The controller is also used to receive the fault position and fracture position of the acquisition location input by the user, and after the rotary head is working, it continuously calculates the drilling speed based on the drilling depth, and controls the transmission motor to make the surface speed of the drive wheel 5 and the upward movement speed of the heat sealing film 72 equal to the downward drilling speed of the drill rod 1. It continuously calculates the difference between the drilling depth and the fault position, and the difference between the drilling depth and the fracture position. Only when any of the above differences is less than the set minimum value, it is determined that a fracture or fault has appeared on the rock core 3 at this time. Then, it controls the corresponding transmission motor of the drive wheel 5 on either side to change the output power and controls the storage module to work. In this embodiment, the controller controls the heating wire and the transmission motor to work to complete the acquisition and fixation of the rock core 3.

[0039] The specific implementation method is as follows: When using this scheme, the device is set up according to the core sampling scheme. Based on the possible locations of rock strata cracks and faults obtained by the geophysical exploration technology in the early stage, the heat sealing film 72 and the limiting film are rolled up and clamped into the inner cylinder 2 to ensure that the heat sealing film 72 and the limiting film can rotate but cannot undergo large linear displacement. After the heat sealing film 72 and the limiting film pass through the limiting clamp 71, they are fixed to the reel 8. The device is started, and the drill rod 1 and the core drill bit are driven to work through the rotary device and the winch. During the drilling process, the rock core 3 is gradually formed, and the rock core 3 moves upward relative to the core drill bit, that is, the rock core 3 moves upward relative to the inner cylinder 2.

[0040] At this time, the transmission motor drives the drive wheel 5 to rotate through the flexible shaft. The drive wheel 5 drives the outer circumferential wall of the elastic ring to move downward. When the outer circumferential wall of the elastic ring moves to the bottom, it is squeezed inward by the bracket 6 and shrinks to form the inner circumferential wall. The inner circumferential wall moves upward and, after reaching the top of the elastic ring, it returns to the outer circumferential wall. During the above process, the elastic ring drives the driven wheel 61 installed inside it to rotate.

[0041] As core 3 is formed, it gradually approaches the elastic ring. After contacting the elastic ring at its end, the outer circumference of the elastic ring contracts, clamping the end of core 3. With the rotation of the elastic ring, core 3 gradually enters the inner circumference, thus guiding and protecting it and reducing potential damage caused by collisions between core 3 and the drill pipe 1 or the inner wall of the inner cylinder 2 during core formation. Furthermore, the design of the fixing teeth 41 in this scheme significantly increases the contact area between the elastic ring and core 3 through deformation, reducing the probability of core 3 sliding relative to the elastic ring during movement. This further reduces the probability of core 3 causing blockage inside the inner cylinder 2 due to sliding, thus affecting the subsequent entry of core 3.

[0042] Furthermore, the heating wire installed at the end of the limiting clamp 71 continues to work, causing the heat-sealing film 72 to form a sleeve. When the end of the core 3 reaches the limiting clamp 71, it pushes the limiting clamp 71 to deform to both sides away from its axis and gradually passes through the limiting clamp 71. During the above process, under the action of the magnetic strip, the inner side of the limiting clamp 71 deforms along the side wall of the core 3, thereby expelling the air inside the sleeve around the core 3.

[0043] During the above process, the controller obtains the drilling depth of the core drill bit simultaneously based on the fault and fracture locations input by the user. When drilling reaches the fault or fracture location, the controller changes the drive wheel 5 on the same plane, causing the drive wheel 5 in any direction to stop rotating or accelerate. However, there is a drilling speed difference between the drive wheel 5 in that direction and the other drive wheels 5. Affected by the speed difference of the drive wheel 5, the movement speed of different positions of the transmission ring 4 varies. At this time, under the action of the transmission ring 4, the axis of the core 3 located above the transmission ring 4 is offset. That is, at this time, the side of the core 3 facing the axis offset is under pressure, while the other side is under tension. As stress concentration occurs at the fracture or fault location of the core 3, the crack at that location intensifies. As the crack intensifies, the stress concentration becomes more intense until the core 3 fractures.

[0044] As core 3 fractures, the supporting force of core 3 below the crack on core 3 above the crack is offset by the gravity of core 3 above the crack. The force exerted by core 3 above the crack on the limiting clamp 71 increases, causing the deformation of the limiting clamp 71 to intensify. Since this section of core 3 has fractured, the force it exerts on the limiting clamp 71 will only fluctuate within a certain range after increasing to a certain value.

[0045] During the above process, the strain gauge works continuously to acquire the deformation information of the limit clamp 71 in real time. When the deformation information continues to increase, at a certain moment, the acceleration of the increase in deformation information decreases and fluctuates within the set range. At this time, the controller determines that the core 3 is fractured.

[0046] When the fracture occurs between the limiting clamp 71 and the elastic ring, the core 3 above the fracture location separates from the core 3 below the fracture location. However, due to the limiting effect of the limiting clamp 71 and the elastic ring, their axes cannot deviate significantly. This allows the core 3 below the fracture location to provide a certain supporting force to the core 3 above the fracture location, thereby pushing it to continue moving upward. During this process, the friction between the heat-sealing film 72 and the core 3 further restricts the deviation of the core 3, further improving the stability of the movement of the core 3 above the fracture location. As the heat-sealing film 72 moves, the friction between it and the core 3 can further guide the core 3 to move upward.

[0047] When the fracture occurs below the elastic ring, the core 3 can be pushed upward as the elastic ring flips until the fracture position moves between the limiting clamp 71 and the elastic ring.

[0048] As the fracture location gradually moves to the limiting clamp 71, the core 3 above the fracture location essentially enters the heat-sealing membrane 72. Due to the action of the magnetic strip, most of the gas inside the heat-sealing membrane 72 surrounding the core 3 is expelled (in the initial state, the limiting clamp 71 is closed, meaning the stress information is zero; at this time, the heating wire heats the heat-sealing membrane 72, causing the sleeve formed by the heat-sealing membrane at the top of the first core 3 to be in a closed state). At this point, the controller controls the drive motor to operate, causing the surface speed of the drive wheel 5 to be greater than the drilling speed, thus causing the speed of the upper core 3 to be greater than its... The core 3 below causes the limiting membrane and heat-sealing membrane 72 to roll upward at an increased speed. During the upward movement of the limiting membrane and heat-sealing membrane 72, the limiting membrane drives the heat-sealing membrane 72 to move upward through friction. The heat-sealing membrane 72 drives the core 3 to move upward through friction and negative pressure. When this section of the core is completely separated from the elastic strip, the stress information returns to zero. At this time, the magnetic strip causes the limiting clamp 71 to gradually enter the fracture point of the core 3. The controller controls all the heating wires to work and heat the heat-sealing membrane 72, causing the heat-sealing membrane 72 to close and form a separate storage chamber, thus completing the collection of this section of the core 3.

[0049] Furthermore, during the aforementioned process, since the lower core 3 will continue to enter the sleeve formed by the heat-sealing film 72, it is only necessary to slightly exceed the height of the limiting clamp 71 in the process of the upper core 3 and the lower core 3 of the crack, or the gap on one side. That is, it is only necessary to make the axis of the upper core 3 and the lower core 3 of the crack have a certain angle. The magnetic strip can make the distance between the inner walls of the limiting clamp 71 less than the diameter of the core 3 through its own magnetism. With the subsequent movement of the heat-sealing film 72, the separation of the upper core 3 and the lower core 3 of the crack can be achieved. By changing the speed of the drive wheel 5 to drive the upper core 3 of the crack away from the lower core 3, even if it is not achieved due to malfunction, it has little impact on the formation of heat sealing of the broken core 3, and only reduces the heat sealing effect to a certain extent.

[0050] During subsequent coring, the above steps are repeated until all coring work is completed. After coring is completed, the operator lifts the drill rod using a winch. At this time, one end of the core 3 is located below the last fracture position, but this section of core 3 is not within the sampling range. It is held by the elastic ring but does not enter the heat-sealing membrane 72. As the drill is lifted, this section of core 3 separates from the device. That is, after the implementation of this scheme, the last sampled core 3 is still in a separate storage chamber. Then, the heat-sealing membrane 72 and the limiting membrane are removed. By cutting the heat-sealing membrane 72, the sampled core 3 can be taken out, thus achieving the sampling of core 3.

[0051] Compared to existing technologies that use core tubes to store and protect core 3 during drilling, the design of the transmission ring 4 in this solution uses the operation of the drive wheel 5 to rotate the transmission ring 4, thereby clamping the core 3 and guiding it. This effectively avoids the traditional solution of using core tubes. When the core 3 tilts or breaks and obstructs the entry of subsequent core 3, it can reduce the occurrence of the core 3 in the core tube being squeezed and crushed and losing its representativeness.

[0052] Furthermore, this solution can also offset the axis of the upper and lower core 3 of the transmission ring 4 by asynchronously moving the drive wheel 5, thereby causing stress concentration at the gaps or faults of the core 3 and causing it to break due to stress concentration. Compared with the existing technology of performing preliminary cutting after the core 3 is taken out, this solution reduces the overall workload of the operator by simultaneously performing preliminary cutting of the core 3 during the core extraction process. At the same time, since this solution performs preliminary cutting and sealing of the core 3, it further avoids the core 3 breaking or tilting and causing obstruction to the subsequent entry of the core 3. Compared with the solution of cutting the core 3 by hammering or chopping, this solution can effectively avoid the large local pressure and shock wave generated by hammering in narrow spaces such as inner tubes, which could cause the core 3 to break and break at other locations, thus affecting its representativeness. At the same time, in this solution, the core 3 is cut along its original crack position, which effectively reduces the huge damage to the information fidelity and sampling representativeness of the core 3 that may be caused by the solution of cutting the core 3 into equal lengths.

[0053] Furthermore, in this scheme, the position of the core 3 is restricted to a certain extent by the combined use of the transmission ring 4 and the fixed ring, thereby reducing the probability of collision damage between the core 3 and the inner wall of the inner cylinder 2 at various positions.

[0054] Meanwhile, the design of the heat-sealing membrane 72 used in this solution, compared with existing technologies, achieves preliminary fixation and sealing of the core 3, reducing damage to the core 3 during drilling and the loss of easily volatile and oxidized components inside the core 3, thus reducing the original state of the core 3. At the same time, the design of the heat-sealing membrane 72 can also guide the direction of movement of the core 3, further reducing the probability that the cut core 3 will obstruct the entry of subsequent core 3.

[0055] This solution also utilizes strain gauges to monitor the deformation of the elastic strip, thereby applying force to the core 3 above the transmission ring 4 and determining the connection status between this portion of the core 3 and the core 3 below the transmission ring 4. This allows for the determination of whether this portion of the core 3 has been completely separated. Compared to solutions without strain gauges, this solution can accurately determine the timing of the sealing heat-sealing film 72, preventing the heating wire from directly acting on the core 3, which could damage the pore structure of the core 3 and cause dehydration, phase change, oxidation, or reduction reactions, severely compromising the original state of the core 3.

[0056] Meanwhile, the design of the fixed tooth 41 in this scheme also greatly increases the contact area between the transmission ring 4 and the drive wheel 5, thereby increasing the friction between the transmission ring 4 and the drive wheel 5, and thus reducing the relative sliding between the drive wheel 5 and the transmission ring 4 during the transmission process, which affects the guiding effect of the transmission ring 4 on the rock core 3 or the intensification of cracks.

[0057] Furthermore, the design of the limiting membrane in this scheme ensures that the temperature required for the limiting membrane to melt is higher than that of the heat-sealing membrane 72. This prevents the limiting membrane from changing with the heat-sealing membrane 72 during the operation of the heating wire, effectively avoiding the accumulation of heat generated by the heating wire on the limiting clamp 71, which could cause the heat-sealing membrane 72 to melt and break, thereby affecting the subsequent movement of the heat-sealing membrane 72 and consequently affecting the guiding and sealing effect of the heat-sealing membrane 72 on the core 3.

[0058] Example 2

[0059] As attached Figure 5 and attached Figure 6 As shown, the difference from the above embodiment is that: the bracket 6 is made of rigid material, the inner wall of the elastic ring is integrally formed with a plurality of transmission teeth 42, the driven wheel 61 is connected to the elastic ring through the transmission teeth 42, and the driving wheel 5 is connected to the elastic ring through the fixed teeth 41. The driven wheel 61 on the side away from the axis of the elastic ring is positioned corresponding to the position of the driving wheel 5. Both the outer walls of the driven wheel 61 and the driving wheel 5 are provided with elastic material pads, and both the driven wheel 61 and the driving wheel 5 are provided with a plurality of first... The transmission gear 42 and the fixed gear 41 are equipped with second permanent magnets on all tooth surfaces. The magnetic fields of adjacent second permanent magnets are arranged alternately, and the magnetic field of the first permanent magnet is set opposite to that of the second permanent magnet. The distance between adjacent first permanent magnets varies according to the size of the tooth surface and tooth tip of the transmission gear 42 or the fixed gear 41. This ensures that during operation, the first permanent magnets at the contact positions between the driven wheel 61 and the drive wheel 5 and the transmission ring 4 can attract each other with the adjacent second permanent magnets. The drive wheel 5 drives the driven wheel 61 to rotate through the permanent magnets.

[0060] The specific implementation method is as follows: When the motor drives the drive wheel 5 through the flexible shaft, the drive wheel 5 drives the elastic ring to move through the fixed tooth 41. At the same time, the first permanent magnet on the side wall of the drive wheel 5 attracts the second permanent magnet on the fixed tooth 41, causing the tooth surface of the fixed tooth 41 to approach the drive wheel 5. Since the first permanent magnet and the second permanent magnet are in a corresponding relationship, as the drive wheel 5 rotates, there is always a part of the tooth surface of the fixed tooth 41 and a part of the first permanent magnet on the drive ring that are in a mutual attraction relationship. Since the position of the drive wheel 5 is fixed, the position of the fixed tooth 41 that contacts the pad of the drive wheel 5 continuously changes, thereby realizing the flipping of the elastic ring.

[0061] For example, on a certain drive wheel 5, four first permanent magnets A, B, C and D are arranged clockwise, with their magnetic poles facing the elastic ring being positive, negative, positive and negative respectively. At the same time, two adjacent fixed teeth 41 are Jia and Yi. In the counterclockwise direction, the magnetic poles of the second permanent magnets on each tooth surface facing the drive wheel 5 are: Jia a surface - negative, Jia b surface - positive, Yi a surface - negative, and Yi b surface - positive. During the transmission process, in the initial state, the contact area between the tooth groove formed by surface A and the adjacent fixed tooth 41 and the drive wheel 5 is the largest. At this time, A and surface A attract each other. As the drive wheel 5 rotates, the contact area between the tooth groove formed by surface B and surface A and the drive wheel 5 is the largest. At this time, under the action of the drive wheel 5 and gravity, the elastic ring tends to fall, causing the contact area between the tooth groove formed by surface B and surface A and the drive wheel 5 to be smaller than the previous tooth groove. However, since surface B and B attract each other and surface A and C attract each other, the fixed tooth 41 is driven to move towards the drive wheel 5, so that the tooth groove formed by surface B and surface A returns to the position of the previous tooth groove.

[0062] As the elastic ring flips, it pushes the driven wheel 61 closest to the axis of the transmission ring 4 downwards via the transmission teeth 42, and pushes the driven wheel 61 furthest from the axis of the transmission shaft upwards. Since the support 6 is a rigid structure, it restricts the relative movement between the driven wheels 61. Because the driven wheels 61 are evenly distributed around the axis of the transmission shaft, the force transmitted from the elastic ring to the support 6 through the driven wheels 61 is evenly distributed along its axis. Simultaneously, the outer and inner circumferential walls of the elastic ring move synchronously, meaning the resultant force of the thrust from the elastic ring on the driven wheels 61 closest to the outer and inner circumferential walls is approximately the same. Therefore, under the action of these forces, the support 6 can remain stationary relative to the inner cylinder 2, thus restricting the position of the support 6. Furthermore, the mutual attraction between the first and second permanent magnets effectively reduces the torque generated in the support 6 during transmission due to the influence of the core 3, which could cause the support 6 to twist around its axis and affect subsequent transmission.

[0063] Simultaneously, the drive wheels 5 on the same plane move asynchronously, thereby widening the gap in the core 3 to cut off the core 3. During this process, although there is a difference in speed on both sides of the elastic ring, the force exerted on the driven wheel 61 by the outer circumferential wall of the elastic ring and the force exerted on its inner circumferential wall are still in balance. Moreover, the vertical forces are not on the same axis, and the downward force is closer to the side of the drive wheel 5 with a greater speed than the other drive wheels 5, thus forming an effective lever arm and generating torque. Under the action of this torque, the support 6 tends to twist, but at this time the twist generated by the support 6 is no longer around its axis. Since the drive wheels 5 and the driven wheels 61 are arranged in a corresponding manner, the drive wheels 5 restrict the twist of the support 6 and maintain the balance of the support 6.

[0064] Compared to the above solutions, this solution, through the design of the first permanent magnet, the second permanent magnet, and the transmission gear 42, eliminates the need for the support 6 to be fixed to the inner cylinder 2. This allows the transmission ring 4 to remain closed during application, preventing core 3 debris from entering the transmission ring 4 during core 3 movement, thus affecting the original shape of the core 3 and causing wear on the driven wheel 61, which would affect the service life of the device. Furthermore, the closed transmission ring 4 design significantly simplifies the installation, maintenance, and replacement of the transmission ring 4 and the driven wheel 61, reducing the processing and maintenance costs of this solution.

[0065] Furthermore, when the drilling speed of the drive wheel 5 is inconsistent, the degree of stretching at different positions of the elastic ring is different. If, during the stretching process, a certain local area of ​​the elastic ring may approach its elastic limit first, the elastic ring can distribute the load of that local area to other low-stress positions through its own elastic deformation, thereby achieving stress redistribution inside the elastic ring and reducing the probability of local damage. However, in the previous scheme, the support 6 and the inner cylinder 2 need to be fixed, making the elastic ring an open ring shape. The force transmission path is relatively simple, which makes the stress redistribution capability of the previous scheme much lower than that of this scheme.

[0066] Example 3

[0067] The difference from the above embodiment is that: the limiting clamp 71 includes two elastic strips symmetrically arranged along the axis of the inner cylinder 2. In this embodiment, the heating component includes several welding strips, and the welding strips are bonded and fixed to one of the elastic strips on the side close to the axis of the inner cylinder 2. The welding strips are all made of a good conductor of electricity. In this embodiment, the material of the welding strips is copper, and the welding strips are evenly arranged. The other elastic strip is provided with several high-frequency AC coils. The AC coils and the welding strips with the shortest distance to them constitute a heating unit. The AC coils are used to generate an alternating electric field. The alternating electric field only causes eddy currents to be generated in the welding strips within the same heating unit. That is, the maximum distance between the two that can generate eddy currents is less than the distance between any two adjacent welding strips, and the minimum distance between the two that can generate eddy currents is less than twice the sum of the thicknesses of the limiting film and the heat-sealing film 72. The eddy currents cause the welding strips to generate heat, and the welding strips are used to heat and melt the heat-sealing film 72.

[0068] The control system also includes a magnetoresistive sensor and a communication module. The magnetoresistive sensor is used to acquire changes in the magnetic field environment in the area where the elastic strip is located. Both the magnetoresistive sensor and the communication module are electrically connected to the controller. The controller determines whether eddy currents are generated inside the welding strips based on changes in the magnetic field environment. The controller acquires the cross-sectional dimensions of the core sample 3 based on whether eddy currents are generated inside each welding strip, and determines whether the core sample 3 has displaced based on changes in the cross-sectional dimensions. Only after the core sample 3 has displaced does the controller control the communication module to send the sequence of core samples 3 to the user.

[0069] The controller is also used to obtain the actual size of the core 3 input by the user, and after obtaining the cross-sectional size based on whether eddy currents are generated inside each welding rod, calculate the difference between the cross-sectional size and the actual size. Only when the difference is greater than the set maximum value is the core sampling abnormality determined, and the control communication module sends a prompt message to the user.

[0070] The specific implementation method is as follows: When using this device, as the limiting membrane moves, there is no rock core 3 within the cross-section where the elastic strip is located. At this time, the distance between the AC coils in all heating units and the welding strip is within the distance that can generate eddy currents. At this time, as the eddy current electric field is generated, the welding strip generates heat. At this time, due to the action of the magnetic strip, the elastic strip presses the limiting membrane and the heat sealing membrane 72. Under the dual action of pressure and heat, the heat sealing membrane 72 melts and moves closer to each other, so that the compressed position of the heat sealing membrane 72 is sealed. As the heat sealing membrane 72 drives the rock core 3 to move upward, when the rock core 3 passes through the limiting clamp 71, it pushes the elastic strip open. At this time, the elastic strip is close to the rock core 3. The partial bending deformation at position 3 is located in the heating unit at the bending deformation position of the elastic strip. The distance between the AC coil and the corresponding welding strip gradually increases. After the distance between the two exceeds the distance that can generate eddy currents, the AC coil cannot generate eddy current electric fields in the welding strip within the same heating unit, or the total heat generated by the uneven distribution of the generated eddy current electric fields decreases. At this time, the temperature generated by the aforementioned welding strip is insufficient to melt the heat sealing film 72. Therefore, the heat sealing film 72 in this part remains in its initial state, while the welding strip at the undeformed position on the elastic strip is still in the state of heating the heat sealing film 72, causing the heat sealing film 72 in this part to melt and adhere.

[0071] Compared to the previous scheme, this scheme uses a heating unit to heat-seal the heat-sealing film 72 around the core 3, which significantly reduces the activity space of the core 3 after the heat sealing is completed. This effectively reduces the probability of the core 3 rotating during drilling and hoisting, and reduces the loss of occurrence information such as orientation and dip angle of the core 3 that may be caused by the rotation of the core 3.

[0072] Furthermore, in this embodiment, the contact position between the limiting clamp 71 and the core 3 does not heat the heat-sealing film 72, effectively avoiding the decomposition of the internal material of the core 3 due to the heating process, which would affect the representativeness of the core 3.

[0073] Simultaneously, during the aforementioned process, the magnetoresistive sensor continuously acquires magnetic field information in the area where the elastic strip is located. As the eddy current electric field is generated, the magnetic field environment in the area where the elastic strip is located changes. That is, the controller can determine the position of the welding strip where the eddy current electric field occurs based on the changes in the magnetic field information.

[0074] Since only the welding rods at the undeformed positions can generate eddy current electric fields, the relative distance between each welding rod and the elastic modulus of the elastic rod are known, and the two ends of the elastic rod are fixedly connected to the inner cylinder 2, the distance between adjacent welding rods is calculated based on the change of magnetic field information, and the distance with the largest value is selected as the cross-sectional size of the core 3.

[0075] Theoretically, since the axis of core 3 coincides with that of inner cylinder 2, and the cross-sectional area of ​​core 3 is equal at all positions, under ideal working conditions, the position and size of deformation on the elastic strip remain constant. This means that the cross-sectional dimensions and the positions of the welding strips used to calculate the cross-sectional dimensions should be consistent. When the cross-sectional dimensions change slightly, fluctuating only within a set range, but the position of the welding strips used to calculate the cross-sectional dimensions changes significantly, the angle of the core 3 axis changes. If the change in the position of the welding strips used to calculate the cross-sectional dimensions is too large, such as completely deviating from the axis of inner cylinder 2, the controller's communication module will send an alarm to the user, prompting them to lift the drill and inspect. If the change in cross-sectional dimensions exceeds the set range, it may indicate core 3 breakage. In this case, the control communication module will send the user the sequence of core 3 (i.e., the number of times the limit clamp 71 deforms when the abnormal core 3 occurs).

[0076] Meanwhile, due to the deformation state of the limiting clamp 71, the elastic strip cannot completely fit the outer wall of the core 3. That is, the cross-sectional dimension of the core 3 obtained at this time should be slightly larger than the actual size of the core 3 obtained. Therefore, the controller calculates the difference between the actual size and the cross-sectional dimension based on the actual size of the core 3 input by the user, and can determine whether the deformation state of the limiting clamp 71 is within the design range. When the difference between the two is greater than the set maximum value, that is, the deformation of the limiting clamp 71 exceeds the design range, the limiting clamp 71 may be damaged or the magnetic strip may fail. At this time, the controller controls the communication module to alarm the user.

[0077] Compared to existing technologies, this solution can monitor the position, status, and direction of travel of the core 3 while simultaneously heat-sealing it using the limiting clamp 71. It also alerts the user in case of abnormalities, enhancing the device's ability to perceive the borehole condition during drilling. This further reduces the risk of blockage in the inner cylinder 2 due to core 3 tilting and helps the user continuously monitor the working status of the limiting clamp 71, preventing heat-sealing failure of the core 3 due to malfunctions in the limiting clamp 71, which could cause displacement damage to the core 3 during drill rod 1 movement and affect its original shape. Furthermore, this solution can send the location of the broken core 3 to the user after it breaks, assisting in the management of the acquired core 3.

[0078] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sampling device for engineering geological exploration, comprising a frame, wherein a core drilling tool and a first driving component are mounted on the frame, the core drilling tool being used to drill rock cores (3), and the first driving component being used to drive the core drilling tool to work, characterized in that: The core drilling tool is detachably connected to an inner cylinder (2). The inner cylinder (2) is provided with a transmission ring (4), and the transmission ring (4) is coaxially arranged with the core drilling tool. The transmission ring (4) is provided with a bracket (6), and several driven wheels (61) are rotatably connected to the bracket (6). The bracket (6) is used to limit the shape and position of the transmission ring (4) through the driven wheels (61). Several drive wheels (5) are provided on the outer circumferential wall of the transmission ring (4). The drive wheels (5) are used to drive the transmission ring (4) to rotate. The inner cylinder (2) is also provided with a second drive member, which is used to drive the drive wheel (5) to rotate. The transmission ring (4) is used to hold the core (3). A storage component (7) is also provided above the transmission ring (4). The storage component (7) is used to store the core (3). It also includes a control system, which is used to collect the drilling depth, drilling speed and speed of the core drilling tool and the speed of the drive wheel (5). The control system is also used to receive the fault position and crack position of the collection position input by the user, and after the first drive component works, it controls the second drive component to make the surface speed of the transmission ring (4) equal to the drilling speed of the core drilling tool. Only when the difference between the drilling depth and the fault position or crack position is less than a set threshold, it is determined that a crack or fault has appeared on the core (3) at this time. The output power of the drive wheel (5) on either side corresponding to the second drive component is changed, and the storage component (7) is controlled to work synchronously to complete the collection and fixation of the core (3).

2. A sampling device for engineering geological exploration according to claim 1, characterized in that: The transmission ring (4) includes an elastic ring, and the outer wall of the elastic ring is provided with a plurality of fixed teeth (41). The fixed teeth (41) are used to increase the contact area between the transmission ring (4) and the drive wheel (5).

3. A sampling device for engineering geological exploration according to claim 1, characterized in that: The storage assembly (7) includes several limiting clamps (71) and several heat-sealing films (72). The limiting clamps (71) are arranged along the axis of the inner cylinder (2). Several rotating rods (73) are also provided on both sides of the limiting clamps (71). The rotating rods (73) are used to change the movement direction of the heat-sealing films (72). The limiting clamps (71) are made of elastic material, and a magnetic strip is provided on the side wall of the limiting clamps (71) near the core (3). The magnetic strip is used to close the limiting clamps (71). The limiting clamp (71) is also provided with a heating component, which is used to heat the heat sealing film (72) to the melting temperature. After the heat sealing film (72) melts, it becomes a sleeve, which is used to wrap the core (3). The second driving member is also used to drive the heat sealing film (72) to move upward. The heat sealing film (72) is used to drive the core (3) to move upward. The control system is also used to control the operation of the heating component and the second driving member according to the fault location or fracture location.

4. A sampling device for engineering geological exploration according to claim 3, characterized in that: The heat-sealing film (72) is wrapped with a limiting film at a position away from the axis of the inner cylinder (2). The melting point of the limiting film is greater than that of the heat-sealing film (72). The limiting film is used to restrict the movement direction of the heat-sealing film (72).

5. A sampling device for engineering geological exploration according to claim 3, characterized in that: The limiting clamp (71) is also provided with a strain gauge, which is used to obtain the deformation information of the limiting clamp (71). The control system is also used to determine whether the rock core (3) is fractured based on the deformation information, and only controls the second driving component to work after determining that the rock core (3) is fractured.

6. A sampling device for engineering geological exploration according to claim 2, characterized in that: The bracket (6) is made of rigid material. The inner sidewall of the elastic ring is provided with several transmission teeth (42). The driven wheel (61) is connected to the elastic ring through the transmission teeth (42). The driving wheel (5) is connected to the elastic ring through the fixed teeth (41). The outer sidewalls of the driven wheel (61) and the driving wheel (5) are provided with elastic material pads. Several first permanent magnets are provided on the pads of the driven wheel (61) and the driving wheel (5). Second permanent magnets are provided on all tooth surfaces of the transmission teeth (42) and the fixed teeth (41). The magnetic fields of adjacent second permanent magnets are arranged alternately. The driving wheel (5) drives the transmission ring (4) to rotate through the first permanent magnets and the second permanent magnets.

7. A sampling device for engineering geological exploration according to claim 3, characterized in that: The limiting clamp (71) includes two elastic strips symmetrically arranged along the axis of the inner cylinder (2). The heating component includes several welding strips, one of which is close to the axis of the inner cylinder (2), and the other elastic strip is provided with several AC coils. The AC coils and the welding strips with the shortest distance to them constitute a heating unit. The AC coils are used to generate an alternating electric field. The alternating electric field only generates eddy currents in the welding strips within the same heating unit. The welding strips are used to heat and melt the heat-sealing film (72) through the eddy currents.

8. A sampling device for engineering geological exploration according to claim 7, characterized in that: The control system is also used to acquire changes in the magnetic field environment of the area where the elastic strip is located, and to determine whether eddies are generated inside the welding strip based on the changes in the magnetic field environment. The cross-sectional dimensions of the core (3) are acquired based on the position of the welding strip where the eddies are generated, and the core (3) is determined to be displaced based on the changes in the cross-sectional dimensions. The system also sends the order of the core (3) to the user only after the core (3) has been displaced.

9. A sampling device for engineering geological exploration according to claim 8, characterized in that: The control system is also used to obtain the actual size of the core (3) input by the user, and after obtaining the cross-sectional size, calculate the difference between the cross-sectional size and the actual size. Only when the difference is greater than a set threshold is the core sampling abnormality determined and a prompt message is sent to the user.

10. A sampling device for engineering geological exploration according to claim 7, characterized in that: All welding rods are made of materials that are good conductors of electricity.

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