Rare Earth Element Detection System for Downhole Coal Samples Based on X-ray Fluorescence Spectroscopy

Abstract

This invention relates to an underground coal sample rare earth element detection system based on X-ray fluorescence spectroscopy. From top to bottom, it includes a connecting rod, a sampling support layer, and a detection support layer. The sampling support layer is equipped with a drilling rig and two telescopic positioners, with the telescopic positioning rods of the two positioners facing opposite directions. The drilling rig is positioned close to one of the telescopic positioners. The central column of the detection support layer is connected to a rotatable screen and a receiving mesh, used for screening the coal sample dropped by the drill bit and for receiving the coal sample to be tested. The detection support layer is equipped with an X-ray fluorescence spectrometer detector. The top cover of the detector can be opened and closed, and the receiving mesh can rotate to be above the detector, allowing the coal sample to be poured onto the detection position on the upper surface of the detector. The detector is connected to a control device on the ground for controlling the detector's power-on, power-off, and detection process. During detection, the top cover is closed, and the X-rays emitted from the detection position irradiate the coal sample for detection. The detection results are transmitted to the control device on the ground.

Description

Technical Field

[0001] This invention belongs to the field of underground coal sample technology, specifically relating to a rare earth element detection system for underground coal samples based on X-ray fluorescence spectroscopy. Background Technology

[0002] In coal exploration and mining, accurately detecting the rare earth element content in coal-bearing strata traditionally involves drilling into the ground using drilling equipment, then using specialized core sampling equipment to collect core samples, and finally bringing the samples to a laboratory for analysis using specialized instruments. This process is time-consuming and cannot achieve real-time monitoring. Therefore, there is an urgent need for equipment capable of real-time underground sampling and detection to improve detection efficiency and obtain more accurate stratigraphic information. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides an underground coal sample rare earth element detection system based on X-ray fluorescence spectroscopy. From top to bottom, it includes a connecting rod, a sampling support layer, and a detection support layer. The sampling support layer is equipped with a drilling rig and two telescopic positioners. The telescopic positioning rods of the two telescopic positioners face opposite directions. The drilling rig is positioned close to one of the telescopic positioners, which are used to stably position the sampling support layer and the detection support layer, as well as to drill coal samples.

[0004] The central column of the detection support layer is connected to a rotatable screen and a receiving net, which are used to screen the coal samples dropped by the drill bit and to receive the coal samples for testing. An X-ray fluorescence spectrometer is installed on the detection support layer. The top cover of the detector can be opened and closed, and the receiving net can be rotated to be above the detector. The coal sample is poured onto the detection position on the upper surface of the detector. The detector is connected to the control device on the ground, which is used to control the start-up, shutdown and detection process of the detector. During detection, the top cover is closed, and the X-rays emitted from the detection position irradiate the coal sample for detection. The detection results are transmitted to the control device on the ground.

[0005] Optionally, both the sampling support layer and the detection support layer are disc-shaped and concentrically arranged. The outer diameter of the sampling support layer is larger than the outer diameter of the detection support layer and smaller than the inner diameter of the well, so that the sampling support layer and the detection support layer can enter and exit the downhole space.

[0006] A central column is provided at the center of the detection support layer. The top of the central column is connected to the lower surface of the sampling support layer, and the bottom of the central column is connected to the upper surface of the detection support layer. A first motor and a second motor are connected to the same side of the central column. The first motor is connected to the screen through a first telescopic device, and the second motor is connected to the receiving net through a second telescopic device to control the rotation and telescopic movement of the screen and the receiving net.

[0007] Optionally, a first motor, a first telescopic device, a second telescopic device, and a second motor are arranged sequentially from top to bottom. The first shaft of the first motor faces downward and is connected to the first telescopic device, while the second shaft of the second motor faces upward and is connected to the second telescopic device. The first shaft and the second shaft are on the same vertical line.

[0008] Alternatively, the telescopic rods of both telescopic devices can extend or retract radially along the sampling support layer to control the extension or retraction of the screen and receiving net;

[0009] The heads of the two telescopic rods (i.e., the ends furthest from the central column) are equipped with angle rotators to control the screen and the receiving net to rotate around the corresponding telescopic rod so as to pour out the coal samples they have received.

[0010] Alternatively, the receiving mesh may have an outwardly protruding, elongated discharge port on the side facing the detector to facilitate pouring coal samples into the detector.

[0011] Preferably, the outlet is provided with a vertical screening screen at the location where it connects to the receiving mesh, for further screening of coal samples of more suitable size according to particle size.

[0012] Optionally, two telescopic locators are symmetrically arranged with the connecting rod on the sampling support layer as the center. Each telescopic locator includes a hydraulic unit and a telescopic locating rod connected to the hydraulic unit. Both telescopic locating rods are horizontally arranged and point to opposite sides of the well wall. The drill bit is connected to the side of the drilling rig facing the well wall. The drill bit is horizontally arranged and points to the well wall.

[0013] Optionally, a shock-absorbing base is provided below the detector. The shock-absorbing base includes, from top to bottom, a soft pad, several springs, and a base. The central axis of the spring is vertically arranged, and the two ends of the spring are respectively connected to the soft pad and the base. Several springs are evenly arranged on the surface of the base. The springs are rigid springs.

[0014] Optionally, a lifter is provided on the lower surface of the sampling support layer corresponding to the position of the detector. The lifting head of the lifter is connected to the center of the detector top cover and is used to drive the top cover to move up and down, thereby opening and closing the top cover.

[0015] Optionally, the detector is equipped with a detachable sample holder at the detection position. The sample holder is vertically arranged and is an inverted frustum shape that is larger at the top and smaller at the bottom. Both the top and bottom ends of the sample holder are open. The bottom opening of the sample holder allows X-rays from the detection position to enter the sample holder. The outlet is tilted to correspond to the top opening of the sample holder, making it easy to pour the coal sample into the sample holder and receive X-ray irradiation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a rare earth element detection system for underground coal samples based on X-ray fluorescence spectroscopy.

[0017] Figure 2 This is a top view of the upper surface of the sampling support layer;

[0018] Figure 3 This is a schematic diagram of a screen and a receiving mesh.

[0019] Figure 4 A schematic diagram of the detector;

[0020] Figure 5 This is a schematic diagram of the material unloader;

[0021] Figure 6 This is a bottom view of the lower surface of the sampling support layer.

[0022] In the attached diagram, 1-connecting rod, 2-sampling support layer, 3-detection support layer, 4-drilling rig, 5-telescopic positioning device, 6-telescopic positioning rod, 7-drill bit, 8-screen, 9-receiving mesh, 10-discharge port, 11-detector, 12-top cover, 13-sample holder, 14-central column, 15-first motor, 16-second motor, 17-first telescopic device, 18-second telescopic device, 19-disassembly device, 20-circular track, 21-soft pad, 22-spring, 23-base, 24-lifter. Detailed Implementation

[0023] This embodiment provides a rare earth element detection system for underground coal samples based on X-ray fluorescence spectroscopy, such as... Figures 1-6 As shown, from top to bottom, it includes a connecting rod 1, a sampling support layer 2, and a detection support layer 3. The sampling support layer 2 is equipped with a drilling rig 4 and two telescopic positioning devices 5. The telescopic positioning rods of the two telescopic positioning devices face opposite directions. The drilling rig is set close to one of the telescopic positioning devices, which are used to stably position the sampling support layer 2 and the detection support layer 3 and to drill coal samples.

[0024] The central column 14 of the detection support layer 3 is connected to a rotatable screen 8 and a receiving net 9, which are used to screen the coal sample drilled by the drill bit 7 and to receive the coal sample to be tested. An X-ray fluorescence spectrometer 11 is provided on the detection support layer 3. The top cover 12 of the detector 11 can be opened and closed. The receiving net 9 can rotate to be above the detector 11. The coal sample is poured onto the detection position on the upper surface of the detector 11. The detector 11 is connected to the control device on the ground, which is used to control the start-up, shutdown and detection process of the detector 11. During detection, the top cover 12 is closed, and the X-rays emitted from the detection position irradiate the coal sample for detection. The detection results are transmitted to the control device on the ground.

[0025] The connecting rod 1 is existing in the field. The connecting rod 1 is segmented, and each segment is connected by threads. It extends from the ground along the well space to the location where sampling is required downhole. The top of the connecting rod 1 is connected to the support equipment (existing equipment) on the ground, and the bottom of the connecting rod 1 is connected to the sampling support layer 2. It can lead the sampling support layer 2 and the detection support layer 3 down to different depths downhole for sampling and detection.

[0026] Optionally, the bottom end of the connecting rod 1 is connected to the sampling support layer 2 via a sliding adjustment part. The sliding adjustment part includes a track part and several pulleys. The top surface of the track part is connected to the bottom end of the connecting rod. The track part has upper and lower tracks. The pulleys are located between the two tracks and are slidably connected to the two tracks. The pulleys are supported by the lower track. The moving direction of the pulleys is parallel to the telescopic positioning rod. The middle part of the pulleys is connected to the sampling support layer via a rod, which can drive the sampling support layer and the detection support layer to move.

[0027] Both ends of the pulley are vertical wheels. The center of the vertical wheel is rotatably connected to the central shaft in the middle of the pulley. The bottom surface of the central shaft is fixedly connected to the top of the rod. The vertical wheel is slidably connected to the track groove of the two layers of track.

[0028] Optionally, both the sampling support layer 2 and the detection support layer 3 are disc-shaped and concentrically arranged. The outer diameter of the sampling support layer 2 is larger than the outer diameter of the detection support layer 3 and smaller than the inner diameter of the well, so that the sampling support layer 2 and the detection support layer 3 can enter and exit the downhole space.

[0029] A central column 14 is provided at the center of the detection support layer 3. The top of the central column 14 is connected to the lower surface of the sampling support layer 2, and the bottom of the central column 14 is connected to the upper surface of the detection support layer 3. A first motor 15 and a second motor 16 are connected to the same side of the central column 14. The first motor 15 is connected to the screen 8 through the first telescopic device 17, and the second motor 16 is connected to the receiving net 9 through the second telescopic device 18, so as to control the rotation and telescopic movement of the screen 8 and the receiving net 9.

[0030] Optionally, a first motor 15, a first telescopic device 17, a second telescopic device 18, and a second motor 16 are arranged sequentially from top to bottom. The first shaft of the first motor 15 faces downward and is connected to the first telescopic device 17, while the second shaft of the second motor 16 faces upward and is connected to the second telescopic device 18. The first shaft and the second shaft are on the same vertical line.

[0031] In one specific implementation, the side of the central column 14 has two hollow mounting positions, one above the other, for detachably mounting the first motor 15 and the second motor 16, respectively, improving the stability of the two motors and thus the stability of the two telescopic devices. When the two telescopic devices rotate, their ends facing the central column 14 will not touch it. The side of the central column 14 has a connecting rod and a rotating seat. The rotating seat is located between the first telescopic device 17 and the second telescopic device 18, connected to the central column 14. The first telescopic device 17 is rotatably connected to the upper surface of the rotating seat, and the second telescopic device 18 is rotatably connected to the lower surface of the rotating seat. The upper and lower surfaces of the rotating seat each have a rotatable turntable corresponding to the two telescopic devices, making the rotation of the two telescopic devices more stable. The telescopic device can be a small hydraulic cylinder.

[0032] Alternatively, the telescopic rods of both telescopic devices can extend or shorten radially along the sampling support layer 2 to control the extension or retraction of the screen 8 and the receiving screen 9;

[0033] Both telescopic rods have angle rotators at their heads (i.e., the ends furthest from the central column 14) to control the rotation of the screen 8 and the receiving screen 9 around the corresponding telescopic rod, so as to pour out the coal samples they have received. The angle rotators are existing components that can control the rotation angle of the connected components.

[0034] Further optionally, both the screen 8 and the receiving screen 9 are fan-shaped, which makes it easier for the head side of the screen frame (i.e. the end away from the central column 14) to adapt to the arc shape of the well wall and to abut against the well wall, so as to receive more coal samples drilled down by the drill bit 7.

[0035] The receiving net 9 has an outwardly protruding, slender discharge port 10 on the side facing the detector 11, which facilitates pouring coal samples into the detector 11.

[0036] Preferably, the outlet 10 is provided with a vertical screening screen at the position where it connects to the receiving mesh 9, for further screening of coal samples of more suitable size according to particle size.

[0037] Optionally, two telescopic positioning devices 5 are symmetrically arranged with the connecting rod 1 on the sampling support layer 2 as the center. The telescopic positioning device includes a hydraulic device and a telescopic positioning rod 6 connected to the hydraulic device. Both telescopic positioning rods 6 are horizontally arranged and point to opposite sides of the well wall. The drill bit 7 is connected to the side of the drilling rig 4 facing the well wall. The drill bit 7 is horizontally arranged and points to the well wall.

[0038] The drilling rig 4, hydraulic unit, two motors and two telescopic devices are all connected to the control system on the ground via communication or through lines, which facilitates the control of the operation of each piece of equipment.

[0039] Connecting rod 1 lowers the sampling support layer 2 and the detection support layer 3 along the well. Both telescopic positioning rods extend a certain length, but the drill bit's extension length is less than that of the telescopic positioning rods. This protects the drill bit from being hit by protruding rock blocks on the well wall during descent. When the sampling support layer and the detection support layer reach the preset sampling depth, descent is paused. The telescopic positioning rod closest to the drilling rig shortens to a length shorter than the drill bit, while the other telescopic positioning rod extends and abuts against the well wall. This causes the sampling support layer 2 and the detection support layer 3 to move in the direction indicated by the telescopic positioning rod closest to the drilling rig. This movement is achieved through a sliding adjustment mechanism, ensuring that the drill bit 7 head abuts against the corresponding well wall. Then, two motors control the corresponding telescopic devices to rotate, and the telescopic devices control the corresponding telescopic rods to extend, causing the sides of the screen 8 and the receiving mesh 9 facing the well wall to abut against the well wall. At this point, the screen 8 and the receiving mesh 9 are positioned one above the other, directly below the drill bit 7, with most of their surfaces overlapping.

[0040] The control system on the ground starts the drilling rig 4, which drills into the well wall, and the coal chunks that are drilled fall onto the screen 8. Due to the vibration of the drilling rig 4, the vibration is transmitted through the central column 14 and two telescopic rods to the screen 8 and the receiving mesh 9. The vibration of the screen 8 and the receiving mesh 9 helps to screen the coal sample. The screen 8 filters out larger coal chunks, while appropriately sized coal samples are retained on the receiving mesh 9. Coal samples with too small a particle size pass through the receiving mesh 9 and fall into the well. Then the drilling rig 4 stops working.

[0041] The second telescopic device 18 and the receiving net 9 are rotated by the second motor 16. When the second telescopic device 18 rotates to the side above the detector 11, the top cover 12 of the detector 11 has been removed in advance. The second telescopic device 18 adjusts the position of the receiving net 9 again. Then the angle rotator controls the receiving net 9 to rotate in the vertical direction, so that the discharge port 10 tilts towards the detection position of the detector 11. The coal sample on the receiving net 9 is screened again by the screening screen. The coal sample with a suitable particle size can be poured into the detection position through the discharge port 10.

[0042] After the receiving mesh 9 leaves below the screen 8, the angle rotator of the screen 8 controls the screen 8 to rotate, emptying the material inside, and then the screen 8 returns to its original position. Similarly, the receiving mesh 9 also empties the material inside and then returns to its original position.

[0043] Optionally, the position of the detector 11 corresponds vertically to the position of the telescopic locator away from the drilling rig, so as to avoid affecting the operation of the screen 8 and the receiving screen 9, and at the same time minimize the impact of the vibration of the drilling rig 4 on the detector 11.

[0044] The detector 11 is provided with a shock-absorbing seat below it. The shock-absorbing seat includes a soft pad 21, several springs 22 and a base 23 from top to bottom. The soft pad 21 and the base 23 are the same size. The central axis of the spring 22 is set vertically. The two ends of the spring 22 are connected to the soft pad 21 and the base 23 respectively. Several springs 22 are evenly arranged on the surface of the base 23.

[0045] The soft pad 21 is made of rubber, which is both elastic and has a certain strength to keep the soft pad 21 in a flat shape. Combined with the support of the spring 22, the soft pad 21 is kept stable, thus providing effective support for the detector 11 while also shielding the vibration from the drilling rig 4 as much as possible.

[0046] This invention utilizes a shock-absorbing base design. A rigid spring 22 provides support, and a certain gap exists between the soft pad 21 and the base 23. The spring 22 and the soft pad 21 work together to absorb shock and protect the detector 11. Furthermore, the detector 11 is positioned relatively far from the drilling rig 4 (below the telescopic positioner 5), resulting in effective vibration damping. When testing is required, the evenly distributed rigid springs 22 also provide stable support for the detector 11.

[0047] Optionally, a lifter 24 is provided on the lower surface of the sampling support layer 2 corresponding to the position of the detector 11. The lifting head of the lifter 24 is connected to the center of the top cover 12 of the detector 11, and is used to drive the top cover 12 to move up and down, thereby opening and closing the top cover 12. After the top cover 12 is pulled up and opened, it is convenient for the discharge port 10 of the receiving mesh 9 to pour coal samples to the detection position; after the top cover 12 is lowered to cover the detector 11, it provides a dark background environment around the detection position, provides a reference background for detection, and allows X-rays to irradiate and detect the coal sample, thus improving detection accuracy.

[0048] The detector 11 can be a portable rare earth element detector 11, such as the Cynesys portable desktop XRF rare earth element detector 11, which can detect various heavy and light rare earth elements, such as Gd, Tb, Dy, Lu, Er, Yb, Ho, La, Ce, Pr, Nd, Sm, and Eu. The detector 11 is battery powered, can record multiple sets of data, and has Wi-Fi, Bluetooth, and GPS sharing functions. It can remotely control the detection process and then transmit the detection data to a ground-based data processing terminal for data analysis and processing to obtain the precise content of various rare earth elements in the coal sample. This invention improves the original detector 11's openable top cover 12 to the aforementioned liftable top cover 12, facilitating the pouring of coal samples from the discharge port 10 of the receiving mesh 9.

[0049] Optionally, the detector 11 is equipped with a detachable sample holder 13 at the detection position. The sample holder 13 is vertically arranged and is an inverted frustum shape, wider at the top and narrower at the bottom. Both the top and bottom ends of the sample holder 13 are open. The bottom opening of the sample holder 13 allows X-rays from the detection position to enter the sample holder 13. The outlet 10 is tilted to correspond to the top opening of the sample holder 13, facilitating the pouring of coal samples into the sample holder 13 for X-ray irradiation. The sample holder 13 is made of hard rubber, which avoids scratching the detection position and facilitates the internal loading of coal samples.

[0050] By reasonably setting the internal dimensions of the sample holder 13, the coal sample block that enters the sample holder 13 first can be stuck at the bottom of the sample holder 13, avoiding the bottom coal sample from hitting the transparent sheet on the surface of the detection position. The bottom coal sample can also cover most of the cross-sectional area of ​​the sample holder 13, so that the X-rays emitted by the light source below the detection position can irradiate the bottom coal sample, thereby performing the detection.

[0051] Due to the triple screening effect of the screen 8, the receiving screen 9, and the screening mesh, the particle size of the coal sample entering the discharge port 10 is already quite similar. The width of the discharge port 10 is slightly larger than the particle size of the screened coal sample, so that the internal passage of the discharge port 10 can only accommodate one coal sample of suitable size at a time, thus controlling the discharge quantity of the discharge port 10. The discharge port 10 is tilted, and under the action of gravity, several coal samples of similar size will generally be poured out in sequence, and then the discharge port 10 returns to horizontal. Several coal samples enter the sample holder 13 in sequence. The first coal sample to enter is stuck at the bottom, receiving the subsequent coal samples. The downward impact force and gravity of the subsequent coal samples further compact the bottom coal sample, causing the bottom coal sample to cover the cross-section of the sample holder 13 at its height. The subsequent coal samples are loaded in the upper part of the sample holder 13 and will not fall into the detector 11. The top cover 12 has a certain height. After the lifter 24 closes the top cover 12, the sample holder 13 can be accommodated inside the detector 11.

[0052] The underground coal sample rare earth element detection system provided by this invention is time-consuming to operate each time it extends into the well. The deeper the sampling, the longer it takes to lower the connecting rod 1 to the target depth. The aforementioned screen 8 and receiving screen 9 can be flipped to pour the internal coal sample into the well, and after being repositioned, they can be used for sampling again. The drilling rig 4 and drill bit 7 can also drill and sample at different depths in the well along with the connecting rod 1. This invention provides the following solution, enabling the detector 11 to detect multiple samples underground.

[0053] Optionally, the detection support layer 3 is provided with a dismantler 19 and a waste bin. The waste bin is located between the detector 11 and the dismantler 19. The dismantler 19 is a hydraulic device with a horizontal telescopic rod. A bracket is provided below the hydraulic device so that the height of the telescopic rod corresponds to the height of the bottom of the sample holder 13 inside the detector 11. The head of the telescopic rod is provided with an openable gripper for holding the sample holder 13, and then the sample holder 13 and the coal sample inside it are thrown into the waste bin.

[0054] The hydraulic device is connected to the ground control system and can control the extension and retraction of the telescopic rod and the opening and closing of the gripper. After the test, the top cover 12 is opened, and the gripper grabs the sample holder 13 and grabs the coal sample inside it. Since the bottom coal sample blocks the bottom opening of the sample holder 13, the gripper grabs the bottom of the sample holder 13, which is equivalent to clamping the bottom coal sample. Therefore, no coal sample will fall during the transfer (removal) of the sample holder 13.

[0055] Optionally, the lower surface of the sampling support layer 2 is provided with a circular track 20, and several lifters 24 are slidably connected to the circular track 20. The circular track 20 is concentrically arranged with the sampling support layer 2. Each lifter 24 is connected to a top cover 12, and a sample holder 13 is detachably connected inside each top cover 12. Each time a coal sample is tested, one top cover 12 and one sample holder 13 are used.

[0056] In one specific implementation, since the height of the second telescopic device 18 and the receiving net 9 is between the top of the first telescopic device 17 and the top of the sample holder 13 installed on the detector 11, the top cover 12 connected to the circular track 20 may touch the first telescopic device 17 when moving along the circular track 20. However, after the height is designed, it can avoid touching the second telescopic device 18. In this way, each top cover 12 can rotate along the circular track 20 with one side of the first telescopic device 17 and its telescopic rod as the starting point and the other side as the ending point. For example, all the top covers 12 (e.g., 3-5) are arranged in sequence at the starting point of the circular track 20, and then rotate one by one along the same direction of the circular track 20 to the ending point. Each time a top cover 12 is rotated, a coal sample is tested. Taking a top cover 12 as an example, the top cover 12, holding the sample holder 13, moves above the detector 11. The lifting head controls the top cover 12 to descend, so that the sample holder 13 connects to the detection position and disengages from the top cover 12. The top cover 12 then rises again, and after the coal sample is poured in, the top cover 12 descends again for detection. After the detection is completed, the top cover 12 rises and moves to the end point of the circular track 20. The unloader 19 and the waste box are located below the top cover 12 during movement, so as not to affect the movement of the top cover 12. The unloader 19 and the waste box are preferably located in the area between the detector 11 and the end point of the circular track, and the rotation range of the receiving net 9 is preferably in the area between the detector 11 and the starting point of the circular track, so that the feeding and unloading do not affect each other.

[0057] Further optionally, a first snap-fit ​​groove protruding upward is provided around the perimeter of the detection position for snap-fitting the sample holder 13, and a second snap-fit ​​groove protruding downward is provided on the lower surface of the top surface of the top cover 12 corresponding to the position of the detection position for temporarily snap-fitting the sample holder 13.

[0058] The upper surface of the first slot has an upper notch, and the lower surface of the second slot has a lower notch. The opening of the upper notch is smaller than the opening of the lower notch, making it more difficult for the bottom of the sample holder 13 to enter and exit the upper notch, while it is easier for the top of the sample holder 13 to enter and exit the lower notch.

[0059] When on the ground, a sample holder 13 is pre-installed inside each top cover 12. The top of the sample holder 13 is pressed into the lower notch of the second snap-fit ​​groove, allowing it to be held in place. When the lifter 24 descends and fastens the top cover 12 onto the detector 11, the downward pressure presses the bottom of the sample holder 13 into the upper notch of the first snap-fit ​​groove. The sample holder 13 is made of hard rubber and has a certain degree of elasticity, preventing it from being damaged. Then, the lifter 24 rises, the upper notch holding the sample holder 13 in place, and the top of the sample holder 13 relatively easily detaches from the lower notch, thus separating it from the top cover 12, completing the installation of the sample holder 13.

[0060] After testing, the sample holder 13 is pulled laterally using the disassembly tool 19, which is equivalent to a tangential pulling force, making it relatively easy to pull the sample holder 13 out of the upper notch. The first and second locking slots are also made of hard rubber.

Claims

1. A rare earth element detection system for underground coal samples based on X-ray fluorescence spectroscopy, characterized in that, From top to bottom, it includes a connecting rod, a sampling support layer and a testing support layer. The sampling support layer is equipped with a drilling rig and two telescopic positioners. The telescopic positioning rods of the two telescopic positioners face opposite directions. The drilling rig is set close to one of the telescopic positioners, which are used to stabilize the sampling support layer and the testing support layer and to drill coal samples. The central column of the detection support layer is connected to a rotatable screen and a receiving mesh, used to screen the coal sample dropped by the drill bit and to receive the coal sample for testing. A first motor and a second motor are connected to the same side of the central column. The first motor is connected to the screen through a first telescopic device, and the second motor is connected to the receiving mesh through a second telescopic device to control the rotation and telescopic movement of the screen and the receiving mesh. An X-ray fluorescence spectrometer is installed on the detection support layer. The top cover of the detector can be opened and closed, and the receiving mesh can rotate to be above the detector. The coal sample is poured onto the detection position on the upper surface of the detector. The detector is connected to a control device on the ground to control the start-up, shutdown, and detection process of the detector. During detection, the top cover is closed, and the X-rays emitted from the detection position irradiate the coal sample for detection. The detection results are transmitted to the control device on the ground.

2. The underground coal sample rare earth element detection system according to claim 1, characterized in that, Both the sampling support layer and the detection support layer are disc-shaped and concentrically arranged. The outer diameter of the sampling support layer is larger than the outer diameter of the detection support layer and smaller than the inner diameter of the well, so that the sampling support layer and the detection support layer can enter and exit the downhole space. A central column is located at the center of the detection support layer. The top of the central column is connected to the lower surface of the sampling support layer, and the bottom of the central column is connected to the upper surface of the detection support layer.

3. The underground coal sample rare earth element detection system according to claim 2, characterized in that, The first motor, the first telescopic device, the second telescopic device, and the second motor are arranged sequentially from top to bottom. The first shaft of the first motor faces downward and is connected to the first telescopic device, while the second shaft of the second motor faces upward and is connected to the second telescopic device. The first shaft and the second shaft are on the same vertical line.

4. The underground coal sample rare earth element detection system according to claim 3, characterized in that, The telescopic rods of both telescopic devices extend or shorten radially along the sampling support layer to control the extension or retraction of the screen and receiving net; Both telescopic rods are equipped with angle rotators at their heads, which control the screen and receiving net to rotate around the corresponding telescopic rod so as to pour out the coal samples they have received.

5. The underground coal sample rare earth element detection system according to claim 2, characterized in that, The receiving mesh has an outwardly protruding, slender discharge port on the side facing the detector, which facilitates pouring coal samples into the detector; A vertical screening screen is installed at the location where the discharge port connects to the receiving mesh, which is used to further screen coal samples of more suitable size according to particle size.

6. The underground coal sample rare earth element detection system according to claim 1, characterized in that, Two telescopic locators are symmetrically arranged with the connecting rod on the sampling support layer as the center. Each telescopic locator includes a hydraulic unit and a telescopic locating rod connected to the hydraulic unit. Both telescopic locating rods are horizontally arranged and point to opposite sides of the well wall. The drill bit is connected to the side of the drilling rig facing the well wall. The drill bit is horizontally arranged and points to the well wall.

7. The underground coal sample rare earth element detection system according to claim 6, characterized in that, The detector is provided with a shock-absorbing seat below it. The shock-absorbing seat includes a soft pad, several springs and a base from top to bottom. The central axis of the spring is set vertically, and the two ends of the spring are connected to the soft pad and the base respectively. Several springs are evenly arranged on the surface of the base.

8. The underground coal sample rare earth element detection system according to claim 1, characterized in that, The lower surface of the sampling support layer is equipped with a lifter corresponding to the position of the detector. The lifting head of the lifter is connected to the center of the detector top cover and is used to drive the top cover to move up and down, thereby opening and closing the top cover.

9. The underground coal sample rare earth element detection system according to claim 8, characterized in that, The detector is equipped with a detachable sample holder at the detection position. The sample holder is vertically set and is an inverted frustum shape that is larger at the top and smaller at the bottom. Both the top and bottom ends of the sample holder are open. The bottom opening of the sample holder allows X-rays from the detection position to enter the sample holder. The outlet is tilted to correspond to the top opening of the sample holder, making it easy to pour the coal sample into the sample holder and receive X-ray irradiation.

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