A coal mine underground drilling coal sample collecting device

Abstract

The utility model discloses a kind of underground coal mine borehole coal sample collecting devices, including hole-fixing pipe, expansion positioning mechanism, chip guide pipe, hopper, support, annular brush, drill bit and drill rod, hole-fixing pipe and chip guide pipe center line coincide, expansion positioning mechanism is arranged in hole-fixing pipe, the front end of chip guide pipe is detachably connected with the rear end of hole-fixing pipe, the bottom of chip guide pipe is provided with chip leakage hole, the upper end of hopper is connected with chip leakage hole, the top end of support supports and connects the rear end lower surface of chip guide pipe, annular brush is installed on the inner wall of chip guide pipe and closely contacts chip leakage hole by buckle, drill bit is installed at the front end of drill rod, drill bit and drill rod pass through chip guide pipe and expansion positioning mechanism from back to front in order to enter coal body, the brush chip end of annular brush is perpendicular to drill rod axial center line. The present application solves the technical problems that the existing measuring device is not complete, the key data measurement error is large, time-consuming and labor-intensive, and there are safety hazards.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine safety production technology, specifically, it relates to a coal sample collection device for underground boreholes in coal mines. Background Technology

[0002] Coalbed methane is a gaseous geological body that originates in and exists within coal seams and strata. It is not only the culprit behind disasters such as coal and gas outbursts and a major greenhouse gas in air pollution, but also a new type of clean energy.

[0003] To effectively address gas disasters and improve coal seam gas utilization, it is essential to accurately collect borehole coal samples and precisely measure key parameters such as coal seam gas content. In the process of preventing coal and gas outbursts, it is necessary to effectively collect borehole coal samples and precisely measure key parameters such as drill cuttings volume and drill cuttings gas desorption index.

[0004] However, factors such as variable coal seam occurrence conditions, defects in sampling equipment, complex sampling environments, and non-standard operating procedures by personnel have led to problems such as low success rates, large measurement errors, and poor safety in borehole coal sampling. These problems result in significantly underestimating the gas content of the coal seam, hindering efficient gas disaster management and large-scale utilization of coal seam gas. They also cause large measurement errors in key parameters such as drill cuttings volume and drill cuttings gas desorption, leading to misjudgments in gas outburst risk prediction and inspection results, thus causing gas outburst accidents and posing a significant threat to the personal safety of coal miners and safe mine production. Furthermore, existing borehole sampling equipment also has the following problems:

[0005] (1) Existing borehole sampling equipment is difficult to operate, resulting in incomplete drilling cuttings sampling. During the sampling process at the coal mine site, workers often use simple equipment such as woven bags to directly lay below the borehole opening to collect drilling cuttings. However, due to the influence of roadway airflow disturbance and drill rod swing, problems such as coal cuttings flying at the borehole opening and incomplete drilling cuttings collection are caused. In addition, coal chunks that fall off the coal wall near the borehole opening due to the influence of drill rod swing are also included in the drilling cuttings collection range, which exacerbates the problem of large measurement errors in indicators such as the amount of drilling cuttings.

[0006] (2) Existing borehole coal sample collection devices have structural design defects when dealing with boreholes at different inclination angles. They lack a design to effectively fix the sampling equipment. The drill cuttings collection device is prone to displacement due to drilling machine vibration, resulting in the loss of drill cuttings and failure to completely collect drill cuttings, which leads to large instrument errors and affects the accuracy of the measurement of indicators such as the amount of drill cuttings.

[0007] To solve the above problems, there is a need for a coal sample collection device for underground boreholes in coal mines that can collect coal samples completely, with high safety, high efficiency, strong environmental adaptability, and simple operation. Utility Model Content

[0008] The purpose of this invention is to provide a coal sample collection device for underground boreholes in coal mines that is highly efficient, safe, adaptable to various environments, and easy to operate, ensuring complete coal sample collection.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A coal sample collection device for underground drilling in a coal mine includes a fixed-hole pipe, an expansion positioning mechanism, a cuttings guide pipe, a funnel, a support, an annular brush, a drill bit, and a drill rod. The center lines of the fixed-hole pipe and the cuttings guide pipe coincide and the length of the center line is along the left-right direction. The expansion positioning mechanism is installed inside the fixed-hole pipe. The front end of the cuttings guide pipe is detachably connected to the rear end of the fixed-hole pipe. A cuttings leakage hole is opened at the bottom of the cuttings guide pipe. The upper end of the funnel is connected to the cuttings leakage hole. The top end of the support supports and connects to the lower surface of the rear end of the cuttings guide pipe. The annular brush is installed on the inner wall of the cuttings guide pipe by a snap fastener and is located at the rear end of the cuttings leakage hole. The drill bit is installed at the front end of the drill rod. The drill bit and the drill rod pass through the cuttings guide pipe and the expansion positioning mechanism from back to front to enter the coal body. The cuttings brush end of the annular brush is perpendicular to the axial center line of the drill rod.

[0011] The expansion positioning mechanism includes an inner sleeve coaxially arranged with the fixed hole tube. A rotating wheel is installed on the inner sleeve. Several pressing blocks are evenly arranged along the circumference of the rotating wheel. The inner surface of the pressing block is an arc-shaped surface and the arc-shaped surface is fixedly connected to the outer circle of the rotating wheel. The outer surface of the pressing block is a slope, one end of which is connected to and tangent to the outer circle of the rotating wheel. A sliding groove with an outward opening is opened along the length direction on the pressing block. A through hole corresponding to the pressing block is arranged along the circumference of the fixed hole tube. A fixed hole rivet is installed in the through hole. The outer end of the fixed hole rivet is set in the through hole, and the inner end of the fixed hole rivet is set at one end of the sliding groove.

[0012] A guide tube extends inward from the inner end of the through hole of the fixed hole tube, and the fixed hole rivet is installed along the guide tube.

[0013] At least three fixed-axis rods are provided between the outer surface of the inner sleeve and the inner wall of the fixed-hole tube. The fixed-axis rods are evenly arranged along the circumference of the inner sleeve and the inner end of the fixed-axis rods is fixedly connected to the outer surface of the inner sleeve.

[0014] The rear end of the inner sleeve has a through-hole that runs radially through it.

[0015] The fixed-hole rivet includes a pointed part, a rivet section, a connecting section, and a sliding part. The pointed part is located at the outer end of the rivet section, and the sliding part is located at the inner end of the rivet section through the connecting section. The opening width of the sliding groove corresponds to the diameter of the connecting section, and the groove width of the sliding groove corresponds to the diameter of the sliding part. The pointed part is installed in the through hole, a part of the rivet section is installed in the guide tube, and the sliding part is installed in the sliding groove.

[0016] The support includes a left support leg assembly and a right support leg assembly. The left support leg assembly and the right support leg assembly have the same structure, both including a support, a lower support leg outer tube, an upper support leg inner tube, and a ball joint. The upper support leg inner tube is inserted into the lower support leg outer tube. The upper support leg inner tube has a first mounting hole along its length, and the lower support leg outer tube has a second mounting hole corresponding to the first mounting hole along its length. The upper support leg inner tube and the lower support leg outer tube are connected by adjusting bolts and adjusting nuts.

[0017] The top end of the inner tube of the upper outrigger is connected to the chip guide tube through a ball joint. The support includes a base plate, a first ear plate and a second ear plate. The first ear plate and the second ear plate are arranged opposite to each other on the base plate. The lower end of the outer tube of the lower outrigger is installed between the first ear plate and the second ear plate.

[0018] A collection bag is connected to the lower end of the funnel via a connecting buckle.

[0019] This application uses a corresponding expansion positioning mechanism to fix the fixed hole tube, making the fixing effect of the fixed hole tube more stable, thereby effectively improving the working stability of the device.

[0020] This application reduces the coal dust loss rate, improves coal sample collection efficiency, reduces data errors caused by coal dust loss, and significantly improves the reliability of measurements by using a dynamic sealing ring brush and funnel flow guiding design.

[0021] This application uses fixed-hole rivets for multi-point anchoring, combined with threaded connections, to ensure that the overall device remains fixed during high-frequency vibration of the drilling rig, thus solving the problem of displacement caused by drilling rig vibration in traditional collection methods.

[0022] The height of the device in this application can be adjusted by adjusting the length of the upper and lower support legs with adjusting nuts, so that the coal sample collection device of this application can adapt to complex conditions such as different coal seam thicknesses and different borehole inclination angles, thus broadening the application scenarios of the device and improving its applicability.

[0023] In summary, this application has a simple structure, a scientific principle, and is easy to operate. It not only solves the problems of incomplete coal sample collection, poor stability, and limited functionality of traditional coal sample collection devices, but also significantly improves data accuracy, safety, and applicability. Furthermore, it effectively solves the technical problems of incomplete drill cuttings collection, large errors in key data, time-consuming and labor-intensive processes, and safety hazards in existing measuring devices. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the working state of this utility model.

[0025] Figure 2 This is a structural schematic diagram of the solidified hole state of the solidified hole tube of this utility model.

[0026] Figure 3This is a schematic diagram of the structure of the inner sleeve and rotating wheel of this utility model.

[0027] Figure 4 This is a structural schematic diagram of the initial state of the fixed hole rivet of this utility model.

[0028] Figure 5 This is a structural schematic diagram of the fixed hole state of the fixed hole rivet of this utility model.

[0029] Figure 6 This is a structural schematic diagram of the rotating wheel and the top pressure block of this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the guide tube of this utility model.

[0031] Figure 8 This is a schematic diagram of the fixed-axis rod of this utility model.

[0032] Figure 9 This is a structural schematic diagram of the fixed hole rivet of this utility model. Detailed Implementation

[0033] like Figures 1-9 As shown, a coal sample collection device for underground boreholes in a coal mine includes a fixed borehole tube 1, an expansion positioning mechanism, a chip guide tube 3, a funnel 4, a support 5, an annular brush 6, a drill bit 7, and a drill rod 8. The center lines of the fixed borehole tube 1 and the chip guide tube 3 coincide. The expansion positioning mechanism is installed inside the fixed borehole tube 1. The front end of the chip guide tube 3 is detachably connected to the rear end of the fixed borehole tube 1. The chip guide tube 3 is made of flame-retardant reinforced nylon. The chip guide tube 3 is 600mm long, and its outer diameter is adapted to that of the fixed borehole tube 1. The wall thickness of the chip guide tube 3 is 5mm. The chip guide tube 3 and the fixed borehole tube 1 are connected by threads, and a compression fluororubber sealing ring is used at the connection to prevent leakage. The chip guide tube 3 has a downward-facing chip leakage hole. The upper end of the funnel 4 is connected to the chip leakage hole. The top of the bracket 5 supports and connects to the lower rear surface of the chip guide tube 3. The annular brush 6 is installed on the inner wall of the chip guide tube 3 by a snap fastener, closely attached to the chip leakage hole. The expansion positioning mechanism includes an inner sleeve 2, which is coaxially arranged inside the fixed hole tube 1, and the length of the inner sleeve 2 is greater than the length of the fixed hole tube 1. A rotating wheel 9 is installed on the inner sleeve 2. Figures 1 to 3As shown, two rotating wheels 9 are provided on the inner sleeve 2. In actual production, more rotating wheels 9 can be provided on the inner sleeve 2 as needed. Several pressing blocks 10 are evenly arranged on the circumference of the rotating wheels 9. The inner surface of the pressing block 10 is an arc-shaped surface, and the arc-shaped surface is fixedly connected to the outer circle of the circumference of the rotating wheel 10. The outer surface of the pressing block 10 is a slope, and one end of the slope is connected to and tangent to the outer circle of the circumference of the rotating wheel 10. A sliding groove 11 with an outward opening is opened on the pressing block 10 along the length direction. The fixed hole tube 1 is provided with corresponding pressing blocks 1 along the circumference. A through hole 22 is provided, and a fixing rivet 12 is installed inside the through hole 22. The outer end of the fixing rivet 12 is located inside the through hole 22, and the inner end of the fixing rivet 12 is located at one end of the sliding groove 11. The chip guide tube 3 and the funnel 4 serve to guide the coal sample. The fixing tube 1 is cylindrical. Considering the small diameter of the drill hole, after measuring the S value of the coal chips collected in the first meter of the drill hole, the first meter of the drill hole is enlarged (enlarged to 63mm). Then, the fixing tube 1 is inserted into the coal wall from the hole opening along the drill hole. The rotating gear causes the rivet to be inserted into the coal body 21 to fix the device. The fixing tube 1 has a wall thickness of 3mm, an outer diameter of 60mm (to match the 63mm hole diameter after enlargement, with a 3mm gap for easy insertion), an inner diameter of 57mm (with an embedded rubber ring for anti-slip), and a length of 1.2m (covering the first meter of the drill hole and extending 0.2m outside the hole opening).

[0034] Drill bit 7 is installed at the left end of drill rod 8. Drill bit 7 and drill rod 8 pass through chip guide tube 3 and inner sleeve 2 from right to left to enter coal body 21. The chip-brushing end of annular brush 6 is perpendicular to the axial centerline of drill rod 8. Coal sample is transported out of the hole through spiral blades. Annular brush 6 is set behind and close to chip leakage hole. When coal sample passes through annular brush 6, it is blocked and falls into funnel 4. Annular brush 6 is made of flame-retardant and antistatic silicone rubber; brush length is 100mm, bristle diameter is 0.05mm, and density is 30 bristles / cm2.

[0035] A guide tube 13 extends inward from the inner end of the through hole 22 of the fixed hole tube 1. The fixed hole rivet 12 is installed along the guide tube 13. The guide hole guides the fixed hole rivet 12 and prevents the fixed hole rivet 12 from deviating when the rotating wheel 9 rotates.

[0036] At least three fixed-axis rods 14 are provided between the outer surface of the inner sleeve 2 and the inner wall of the fixed-hole tube 1. The fixed-axis rods 14 are evenly arranged along the circumference of the inner sleeve 2, and the inner end of the fixed-axis rod 14 is fixedly connected to the outer surface of the inner sleeve 2. The fixed-axis rods 14 can prevent radial displacement when the inner sleeve 2 rotates. The outer end of the fixed-axis rod 14 only contacts the inner wall of the fixed-hole tube 1, and there is no connection between the fixed-axis rod 14 and the fixed-hole tube 1, so that the fixed-hole tube 1 will not affect the rotation of the inner sleeve 2.

[0037] The inner sleeve 2 has a through-hole 15 radially provided at its rear end. If the inner sleeve 2 is rotated directly from the front end, it may not be able to rotate. However, a rotating rod that is easy to rotate can be installed through the rotating through-hole 15. Rotating the inner sleeve 2 by rotating the rod will be more effortless and convenient. This method can be used to solve the problem of not being able to rotate the inner sleeve 2 directly.

[0038] The fixed-hole rivet 12 includes a pointed portion 16, a rivet section 17, a connecting section 18, and a sliding portion 19. The pointed portion 16 is located at the outer end of the rivet section 17, and the sliding portion 19 is located at the inner end of the rivet section 17 via the connecting section 18. The opening width of the sliding groove 11 corresponds to the diameter of the connecting section 18, and the groove width of the sliding groove 11 corresponds to the diameter of the sliding portion 19. The pointed portion 16 is installed in the through hole 22, a portion of the rivet section 17 is installed in the guide tube 13, and the sliding portion 19 is installed in the sliding groove 11. The fixed-hole rivet 12 has a diameter of 8mm (with a tapered tip design to reduce resistance when inserted into the coal body 21) and a length of 20mm, and is evenly distributed around the fixed-hole tube 1.

[0039] The bracket 5 includes a left support leg assembly and a right support leg assembly. During construction, the left support leg assembly and the right support leg assembly are fixed side by side. The left support leg assembly and the right support leg assembly have the same structure, both including a support, a lower support leg outer tube, an upper support leg inner tube and a ball joint. The upper support leg inner tube is inserted into the lower support leg outer tube. The upper support leg inner tube is provided with a first mounting hole along the length direction. The lower support leg outer tube is provided with a second mounting hole corresponding to the first mounting hole along the length direction. The upper support leg inner tube and the lower support leg outer tube are connected by adjusting bolts and adjusting nuts.

[0040] The top of the inner tube of the upper outrigger is connected to the chip guide tube 3 through a ball joint. By rotating the ball joint, it can adapt to different coal seam dip angles (-30°~30°).

[0041] The support includes a base plate, a first ear plate, and a second ear plate. The first and second ear plates are positioned opposite each other on the base plate, and the lower end of the outer tube of the lower support leg is installed between the first and second ear plates. The bracket 5 is made of aluminum alloy; it features a telescopic design with a length of 300-500mm (width 30mm, wall thickness 2mm). The top edge of the base plate is 100mm long and 5mm thick, and the lower surface of the base plate has anti-slip texture.

[0042] A collection bag 20 is connected to the lower end of the funnel 4 via a connecting clip. The outlet diameter of the coal sample collection bag 20 is adapted to the inlet of the coal sample container to reduce gas exposure time. Both the funnel 4 and the collection bag 20 are made of flame-retardant and antistatic high-molecular-weight polyethylene; the funnel 4 has an inlet diameter of 300mm, an outlet diameter of 100mm, an inclination angle of 45°, and a wall thickness of 2mm. The coal sample collection bag 20 has a capacity of 10L and a thickness of 1mm.

[0043] In practical use, the device is first tested to ensure its integrity and normal operation. Specifically, the borehole tube 1 and chip guide tube 3 are checked for damage, the gear-controlled ring rivets are checked for normal extension and retraction, and the connections of each part of the device are checked for firmness. Next, the borehole for which the parameters to be measured is drilled. A 42mm twist drill rod 8 is used to drill the first meter in the target coal seam at a uniform speed. The drill cuttings of the first meter are collected, weighed, and the measured values ​​of the drill cuttings are recorded. Then, a 63mm reaming drill bit 7 is replaced to enlarge the first meter of borehole to 63mm and clean the coal cuttings inside the hole. Subsequently, a 60mm outer diameter stainless steel borehole tube 1 is inserted. The enlarged section provides a stable anchoring space for the device. The borehole tube 1 is exposed for 0.2m to connect to the chip guide tube 3, laying the structural foundation for the subsequent fully enclosed collection of coal cuttings. Next, a rotating rod is inserted into the rotating through hole 15 at the rear end of the inner sleeve 2. Rotating the rotating rod drives the rotating wheel 9 on the inner sleeve 2 to rotate. The rotation of the rotating wheel 9 causes the top pressure block 10 to rotate, which in turn causes the sliding groove 11 to rotate. When the sliding groove 11 rotates, the fixed-hole rivet 12 is pushed upwards by the top pressure block 10 along the guide tube 13 and through hole 22, thereby driving the fixed-hole rivet 12 to insert into the coal body 21, forming multi-point anchoring. After the anchoring work is completed, the chip guide tube 3 and the fixed-hole tube 1 are locked together with threads. A compressed fluororubber sealing ring is used at the connection to prevent leakage. The extension and retraction length of the support 5 is adjusted and the device is fixed to ensure the device is vibration-resistant and anti-deviation, thus achieving a rigid connection and seal to prevent coal sample loss. Drilling continues, and the coal sample, after being blocked by the annular soft brush, is introduced into the coal sample collection bag 20 through the funnel 4, ensuring the integrity and purity of the collected coal sample. Finally, close the gate of funnel 4, disassemble the collection bag 20 and weigh the coal sample, and record the drilling depth and S value; when it is necessary to perform gas content determination, the coal sample in the coal sample collection bag 20 can be poured into the coal sample container for gas desorption determination; after resetting the collection bag 20, check the fixed and sealed status of the device.

[0044] This application utilizes a dynamic sealing design with an annular brush 6 and a flow-guiding design with a funnel 4 to reduce coal dust loss, improve coal sample collection efficiency, reduce data errors caused by coal dust loss, and significantly improve measurement reliability. This application employs multi-point anchoring with fixed-hole rivets 12, combined with threaded connections, to maintain the overall device's stability during high-frequency drilling vibrations, solving the displacement problem caused by drilling vibrations in traditional collection methods. The device height can be adjusted by adjusting the lengths of the inner tube of the upper support leg and the outer tube of the lower support leg with adjusting nuts, allowing this coal sample collection device to adapt to complex conditions such as different coal seam thicknesses and different borehole inclination angles, broadening the device's application scenarios and improving its applicability. This application features a simple structure, scientific principle, and convenient operation. It not only solves the problems of incomplete coal sample collection, poor stability, and limited functionality in traditional coal sample collection devices, significantly improving data accuracy, safety, and applicability, but also effectively addresses the technical problems of incomplete drill cuttings collection, large errors in key data measurements, time-consuming and labor-intensive processes, and potential safety hazards in existing measuring devices.

[0045] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A coal sample collection device for underground boreholes in coal mines, characterized in that: The system includes a solidification tube, an expansion positioning mechanism, a chip guide tube, a funnel, a support, an annular brush, a drill bit, and a drill rod. The centerlines of the solidification tube and the chip guide tube coincide, and the length of the centerline is along the left-right direction. The expansion positioning mechanism is located inside the solidification tube. The front end of the chip guide tube is detachably connected to the rear end of the solidification tube. A chip leakage hole is opened at the bottom of the chip guide tube. The upper end of the funnel is connected to the chip leakage hole. The top end of the support supports and connects to the lower surface of the rear end of the chip guide tube. The annular brush is installed on the inner wall of the chip guide tube by a snap-fit ​​and is located at the rear end of the chip leakage hole. The drill bit is installed at the front end of the drill rod. The drill bit and the drill rod pass through the chip guide tube and the expansion positioning mechanism from back to front to enter the coal body. The chip-brushing end of the annular brush is perpendicular to the axial centerline of the drill rod.

2. The coal sample collection device for underground boreholes in a coal mine according to claim 1, characterized in that: The expansion positioning mechanism includes an inner sleeve coaxially arranged with the fixed hole tube. A rotating wheel is installed on the inner sleeve. Several pressing blocks are evenly arranged along the circumference of the rotating wheel. The inner surface of the pressing block is an arc-shaped surface and the arc-shaped surface is fixedly connected to the outer circle of the rotating wheel. The outer surface of the pressing block is a slope, one end of which is connected to and tangent to the outer circle of the rotating wheel. A sliding groove with an outward opening is opened along the length direction on the pressing block. A through hole corresponding to the pressing block is arranged along the circumference of the fixed hole tube. A fixed hole rivet is installed in the through hole. The outer end of the fixed hole rivet is set in the through hole, and the inner end of the fixed hole rivet is set at one end of the sliding groove. A guide tube extends inward from the inner end of the through hole of the fixed hole tube, and the fixed hole rivet is installed along the guide tube.

3. The coal sample collection device for underground boreholes in a coal mine according to claim 2, characterized in that: At least three fixed-axis rods are provided between the outer surface of the inner sleeve and the inner wall of the fixed-hole tube. The fixed-axis rods are evenly arranged along the circumference of the inner sleeve and the inner end of the fixed-axis rods is fixedly connected to the outer surface of the inner sleeve.

4. A coal sample collection device for underground boreholes in a coal mine according to claim 3, characterized in that: The rear end of the inner sleeve has a through-hole that runs radially through it.

5. A coal sample collection device for underground boreholes in a coal mine according to claim 4, characterized in that: The fixed-hole rivet includes a pointed part, a rivet section, a connecting section, and a sliding part. The pointed part is located at the outer end of the rivet section, and the sliding part is located at the inner end of the rivet section through the connecting section. The opening width of the sliding groove corresponds to the diameter of the connecting section, and the groove width of the sliding groove corresponds to the diameter of the sliding part. The pointed part is installed in the through hole, a part of the rivet section is installed in the guide tube, and the sliding part is installed in the sliding groove.

6. A coal sample collection device for underground boreholes in a coal mine according to claim 5, characterized in that: The support includes a left support leg assembly and a right support leg assembly. The left support leg assembly and the right support leg assembly have the same structure, both including a support, a lower support leg outer tube, an upper support leg inner tube, and a ball joint. The upper support leg inner tube is inserted into the lower support leg outer tube. The upper support leg inner tube has a first mounting hole along its length, and the lower support leg outer tube has a second mounting hole corresponding to the first mounting hole along its length. The upper support leg inner tube and the lower support leg outer tube are connected by adjusting bolts and adjusting nuts. The top end of the inner tube of the upper outrigger is connected to the chip guide tube through a ball joint. The support includes a base plate, a first ear plate and a second ear plate. The first ear plate and the second ear plate are arranged opposite to each other on the base plate. The lower end of the outer tube of the lower outrigger is installed between the first ear plate and the second ear plate.

7. A coal sample collection device for underground boreholes in a coal mine according to claim 6, characterized in that: A collection bag is connected to the lower end of the funnel via a connecting buckle.

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