Coal mine sampling device

Abstract

The utility model discloses a coal mine sampling device, which relates to the technical field of sampling devices, and comprises a sampling barrel, a sampling pipe, a sampling pipe and a sampling pipe, the spiral shaft is rotationally mounted in the sampling barrel, and a gap is reserved between the spiral shaft and the inner wall of the sampling barrel; the discharge hole is formed in one end, far away from the sampling hole, of the sampling barrel; the power source is mounted at one end of the sampling barrel and is in transmission connection with the spiral shaft; the at least one reinforcing rib is fixed to the edge position of the spiral shaft in the axial direction, and the reinforcing rib extends into the gap in the rotating direction of the spiral shaft; by means of the reinforcing ribs fixed to the edge of the spiral shaft in the axial direction, the overall rigidity and torsional strength of the spiral shaft are improved, the spiral shaft is effectively prevented from deforming or being subjected to torsional fatigue due to the action of torque and bending moment in the long-distance conveying process, and therefore the service life of the spiral shaft is remarkably prolonged.

Description

Technical Field

[0001] This utility model relates to the field of sampling device technology, specifically a coal mine sampling device. Background Technology

[0002] In the coal mining process, coal seam sampling is a crucial step in assessing coal quality and guiding mining operations. Traditional coal mine sampling devices typically employ a screw conveyor structure, where a rotating screw shaft transports the coal sample entering the sampling cylinder from the sampling port to the discharge port, thus achieving the collection and discharge of the coal sample.

[0003] However, existing sampling devices suffer from the following technical problems in practical applications: the auger shaft is subjected to significant torque and bending moment during long-distance transport, especially when drilling deep into coal seams with high resistance. This can easily lead to torsional fatigue or bending deformation, affecting transport accuracy and service life. Furthermore, existing structures lack effective measures to strengthen the axial strength of the auger shaft. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a coal mine sampling device.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A coal mine sampling device, comprising:

[0007] The sampling tube has a sampling port on the circumference of one end;

[0008] The spiral shaft is rotatably installed inside the sampling tube, with a gap between it and the inner wall of the sampling tube;

[0009] The discharge port is located at the end of the sampling cylinder furthest from the sampling port;

[0010] A power source is installed at one end of the sampling cylinder and is connected to the spiral shaft for transmission.

[0011] At least one reinforcing rib is fixed axially at the edge of the helical shaft, and the reinforcing rib extends into the gap along the rotation direction of the helical shaft;

[0012] The reinforcing rib has an arc-shaped portion located within the gap, and the thickness of the arc-shaped portion gradually decreases along the rotation direction of the spiral shaft.

[0013] The two ends of the spiral shaft extend beyond the axial range of the sampling port and the discharge port, respectively, so that the spiral shaft can transport the material from the sampling port to the discharge port;

[0014] The rotation path of the reinforcing rib as it rotates with the spiral shaft is located inside the sampling cylinder.

[0015] Preferably, the end of the arc-shaped portion has a plurality of radially arranged slots along the axial direction of the spiral shaft.

[0016] Preferably, the reinforcing ribs are provided in multiple ways, and the slots opened on the arc-shaped portions of the multiple reinforcing ribs are staggered in the axial direction.

[0017] Preferably, the plurality of reinforcing ribs are distributed circumferentially at intervals along the helical axis.

[0018] Preferably, the output end of the power source is directly connected to one end of the screw shaft via a coupling.

[0019] Preferably, the sampling tube is further provided with a conical head or drill bit for penetrating the coal seam at the end away from the power source.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. By fixing the reinforcing ribs along the axial direction to the edge of the screw shaft, the overall rigidity and torsional strength of the screw shaft are increased, effectively preventing the screw shaft from deforming or torsional fatigue due to torque and bending moment during long-distance transportation, thereby significantly extending the service life of the screw shaft.

[0022] 2. The arc-shaped part at the end of the reinforcing rib is adapted to the shape of the inner wall of the sampling cylinder and extends into the annular gap between the spiral shaft and the inner wall of the sampling cylinder. When the spiral shaft rotates, it continuously sweeps across the gap area, scraping away or squeezing out any coal powder or particulate material that may enter the gap, effectively preventing the increase in rotational resistance caused by material accumulation. Attached Figure Description

[0023] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0024] Figure 1 This is a three-dimensional structural diagram of the coal mine sampling device of this utility model;

[0025] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the sampling cylinder of the coal mine sampling device of this utility model;

[0026] Figure 3 This is a front view of the coal mine sampling device of this utility model;

[0027] Figure 4 This is a cross-sectional view (AA) of the coal mine sampling device of this utility model;

[0028] Figure 5This utility model relates to a coal mine sampling device. Figure 4 A magnified structural diagram of A in the middle;

[0029] Figure 6 This is a CC cross-sectional view of the coal mine sampling device of this utility model;

[0030] Figure 7 A schematic diagram of the slot opening structure of the coal mine sampling device of this utility model.

[0031] The diagram shows the following labels: 1. Sampling cylinder; 2. Sampling port; 3. Spiral shaft; 4. Discharge port; 5. Power source; 6. Reinforcing rib; 61. Arc-shaped part; 611. Groove. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0033] Example 1

[0034] like Figure 1-7 As shown, a coal mine sampling device includes a sampling cylinder 1, a spiral shaft 3, a power source 5, and at least one reinforcing rib 6.

[0035] The sampling cylinder 1 is a hollow cylindrical structure with a sampling port 2 on one side for sampling after the sampling cylinder 1 is drilled into the coal seam. The sampling cylinder 1 has a discharge port 4 at the end away from the sampling port 2 for discharging the collected coal sample.

[0036] The spiral shaft 3 is rotatably installed inside the sampling cylinder 1 and extends beyond the sampling port 2 of the sampling cylinder 1. Its shaft diameter is smaller than the inner diameter of the sampling cylinder 1, thus forming an annular gap between the outer edge of the spiral shaft 3 and the inner wall of the sampling cylinder 1. The two axial ends of the spiral shaft 3 extend beyond the axial range of the sampling port 2 and the discharge port 4, respectively, thereby ensuring that the blades of the spiral shaft 3 can cover the entire conveying path from the sampling port 2 to the discharge port 4, effectively conveying the coal sample entering the sampling port 2 to the discharge port 4.

[0037] Power source 5 is installed at one end of sampling cylinder 1, and its output end is connected to the end of screw shaft 3 for driving screw shaft 3 to rotate. Preferably, the output end of power source 5 is directly connected to one end of screw shaft 3 through a coupling to reduce transmission loss and improve structural compactness.

[0038] The reinforcing rib 6 is fixed axially at the edge of the spiral shaft 3. Specifically, the reinforcing rib 6 extends into the aforementioned gap along the rotation direction of the spiral shaft 3 (for example, along its tangential direction when viewed radially outward from the spiral shaft 3). The portion of the reinforcing rib 6 located within the gap has an arc-shaped portion 61. The outer surface of the arc-shaped portion 61 is adapted to the shape of the inner wall of the sampling cylinder 1, and the thickness of the arc-shaped portion 61 gradually decreases along the rotation direction of the spiral shaft 3, forming a clearance fit with the inner wall of the sampling cylinder 1, thus creating a wedge-like or knife-edge-like structure.

[0039] When the power source 5 drives the spiral shaft 3 to rotate, the reinforcing rib 6 rotates along with it. Since the arc-shaped portion 61 of the reinforcing rib 6 is located within the gap, it will sweep across the gap of the inner wall of the sampling cylinder 1 during rotation, scraping away or extruding any coal powder or particulate material that may have entered the gap. The tapered design of the arc-shaped portion 61 allows it to cut into the material with less resistance, achieving flexible cleaning.

[0040] In this embodiment, the end of the sampling cylinder 1 away from the power source 5 is also provided with a conical head or drill bit (not shown in the figure) that is fixedly connected to the spiral shaft 3 for breaking into the coal seam, so as to facilitate the entire device to advance into the depth of the coal seam.

[0041] Example 2

[0042] Based on the above embodiment 1, please refer to the following carefully. Figure 4 , Figure 5 and Figure 6 In this embodiment, the structure of the reinforcing rib 6 is further optimized. The end of the arc-shaped portion 61 (i.e., its free end edge) has several radially arranged slots 611 along the axial direction of the helical shaft 3. "Radially arranged" means that each slot 611 extends inward by a predetermined length from the end edge of the arc-shaped portion 61 along the radial direction of the helical shaft 3 (i.e., towards the central axis of the helical shaft 3). This radial slot structure results in multiple independent tooth-like structures at the end of the arc-shaped portion 61.

[0043] When the arc-shaped part 61 rotates with the spiral shaft 3, on the one hand, the edges of each slot 611 form shearing blades, which can radially shear and crush the coal sample (especially the compacted or large-particle part) in the gap, tearing or dividing the material in the radial direction, effectively preventing the material from forming a solid blockage layer in the gap; on the other hand, the radial slots reduce the interaction area between the arc-shaped part 61 and the inner wall of the sampling cylinder 1, changing the action from continuous line action to intermittent point action or short line action, significantly reducing the frictional resistance during rotation.

[0044] Example 3

[0045] This embodiment is a further optimization based on Embodiment 2 described above. Please refer to... Figure 3Multiple reinforcing ribs 6 are provided, and these ribs 6 are distributed at circumferential intervals along the spiral shaft 3 (e.g., uniformly spaced at 90-degree or 120-degree intervals). Radial slots 611 on the arcuate portions 61 of the multiple reinforcing ribs 6 are staggered axially. That is, when viewed along the axial direction of the spiral shaft 3, the radial slots 611 on different reinforcing ribs 6 are located at different axial positions. This arrangement ensures that during one revolution of the spiral shaft 3, the material within the gap is cleaned from different reinforcing ribs 6 at different circumferential positions and subjected to radial shearing action at different axial positions, achieving comprehensive and multi-layered dynamic maintenance of the gap space, greatly improving the anti-jamming and drag-reduction effects.

[0046] In summary, the coal mine sampling device provided by this utility model effectively solves the problems of easy clogging and high rotational resistance of traditional sampling devices by setting reinforcing ribs with a tapered arc section and radially arranged slots on the edge of the spiral shaft and making them intersect with the sampling port. It has the advantages of compact structure, stable operation, high sampling efficiency and long service life, and is suitable for various coal mine sampling operations.

[0047] Drilling and Sampling: Under external thrust, the device penetrates the coal seam through the conical head or drill bit at the front end. As the drilling process progresses, the sampling tube 1 enters the interior of the sampling tube 1 through the sampling port 2.

[0048] Screw conveyor: Power source 5 drives screw shaft 3 to rotate. Since the blades of screw shaft 3 cover the entire path from sampling port 2 to discharge port 4, and there is an annular gap between screw shaft 3 and the inner wall of sampling cylinder 1, the rotating screw blades continuously push the coal sample entering sampling port 2 axially to discharge port 4, completing the discharge and collection of coal sample.

[0049] The reinforcing ribs enhance the structure of the spiral shaft. The reinforcing ribs 6 are fixed axially at the edge of the spiral shaft 3 and rotate with it. On one hand, the reinforcing ribs 6 act as axial reinforcement of the spiral shaft 3, increasing its overall rigidity and torsional strength, effectively preventing deformation or torsional fatigue due to torque and bending moment during long-distance transport, thus extending its service life. On the other hand, the arc-shaped portion 61 of the reinforcing ribs 6 extends into the annular gap between the spiral shaft 3 and the inner wall of the sampling cylinder 1, providing a structural basis for subsequent gap cleaning.

[0050] Dynamic gap cleaning function: For the annular gap between the spiral shaft 3 and the inner wall of the sampling cylinder 1, the reinforcing rib 6, which rotates with the spiral shaft 3, plays a key cleaning role.

[0051] Scraping function: The arc-shaped part 61 at the end of the reinforcing rib 6 is adapted to the shape of the inner wall of the sampling cylinder 1. During the rotation, it continuously sweeps across the gap area, scraping away or squeezing out any coal powder or particulate material that may enter the gap, preventing material accumulation from increasing the rotation resistance.

[0052] Shearing and crushing: The radially arranged slots 611 on the arc-shaped part 61 form multiple independent tooth-like structures. When the reinforcing rib 6 rotates, these tooth-like edges radially shear and crush the material in the gaps, effectively destroying any potential blockage layers.

[0053] Resistance reduction design: The arc-shaped part 61 gradually narrows in thickness along the rotation direction, forming a wedge-shaped structure that can cut into the material with less resistance; at the same time, the groove 611 changes the continuous line contact into intermittent point contact, which significantly reduces the frictional resistance during rotation.

[0054] Multi-dimensional synergistic effect: When multiple circumferentially spaced and axially staggered reinforcing ribs 6 are installed, during one rotation of the spiral shaft 3, the material within the gaps is cleaned by different reinforcing ribs 6 at different circumferential positions and subjected to shearing action at different axial positions. Simultaneously, multiple reinforcing ribs 6 jointly bear the load distribution of the spiral shaft 3, further enhancing its structural stability. This comprehensive, multi-layered dynamic maintenance ensures that the device maintains a stable operating state with low resistance and high flow during long-term operation.

[0055] By fixing the reinforcing ribs 6 axially to the edge of the spiral shaft 3, the overall rigidity and torsional strength of the spiral shaft 3 are increased, effectively preventing the spiral shaft 3 from deforming or torsional fatigue due to torque and bending moment during long-distance transportation, thereby significantly extending the service life of the spiral shaft 3.

[0056] The arc-shaped portion 61 provided at the end of the reinforcing rib 6 is adapted to the shape of the inner wall of the sampling cylinder 1 and extends into the annular gap between the spiral shaft 3 and the inner wall of the sampling cylinder 1. When the spiral shaft 3 rotates, it continuously sweeps across the gap area, scraping away or squeezing out any coal powder or particulate material that may enter the gap, effectively preventing the increase in rotational resistance caused by material accumulation.

[0057] The arc-shaped portion 61 has a gradually decreasing thickness along the rotation direction of the spiral shaft 3, forming a wedge-shaped or knife-edge-like structure. This allows it to cut into the material in the gap with less resistance, achieving flexible cleaning and reducing the cutting resistance during the rotation of the spiral shaft 3.

[0058] By having several radially arranged slots 611 opened at the end of the arc-shaped part 61 along the axial direction of the spiral shaft 3, the end of the arc-shaped part 61 forms multiple independent tooth-like structures. When rotating with the spiral shaft 3, the edges of each slot 611 form shearing blades, which can radially shear and crush the coal sample in the gap, effectively preventing the material from forming a solid blockage layer in the gap.

[0059] The radially arranged slots 611 at the end of the arc-shaped part 61 reduce the contact area between the arc-shaped part 61 and the inner wall of the sampling cylinder 1, changing the contact between the two from continuous line action to intermittent point action or short line action, which significantly reduces the frictional resistance during the rotation of the spiral shaft 3.

[0060] By having multiple reinforcing ribs 6 spaced apart along the circumference of the spiral shaft 3, and radial slots 611 on the arc-shaped portions 61 of the multiple reinforcing ribs 6 staggered in the axial direction, the material in the gap is cleaned from different reinforcing ribs 6 at different circumferential positions and subjected to radial shearing action at different axial positions during one rotation of the spiral shaft 3. This achieves all-round, multi-level dynamic maintenance of the gap space, greatly improving the anti-jamming and resistance reduction effects.

[0061] By directly connecting the output end of the power source 5 to one end of the screw shaft 3 through a coupling, energy loss during transmission is reduced, while the compactness of the power transmission structure is improved, making the overall structure of the device more streamlined and reliable.

[0062] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A coal mine sampling device, characterized in that, include: The sampling tube (1) has a sampling port (2) on the periphery of one end. The spiral shaft (3) is rotatably installed inside the sampling tube (1) and has a gap between it and the inner wall of the sampling tube (1); The discharge port (4) is located at the end of the sampling cylinder (1) away from the sampling port (2); The power source (5) is installed at one end of the sampling cylinder (1) and is connected to the spiral shaft (3) for transmission. At least one reinforcing rib (6) is fixed axially at the edge of the helical shaft (3), and the reinforcing rib (6) extends into the gap along the rotation direction of the helical shaft (3); The reinforcing rib (6) is provided with an arc-shaped part (61) in the gap, and the thickness of the arc-shaped part (61) gradually decreases along the rotation direction of the spiral shaft (3). The two ends of the spiral shaft (3) extend beyond the axial range of the sampling port (2) and the discharge port (4) respectively, so that the spiral shaft (3) can transport the material from the sampling port (2) to the discharge port (4). The rotation path of the reinforcing rib (6) when it rotates with the spiral shaft (3) is located inside the sampling cylinder (1).

2. The coal mine sampling device according to claim 1, characterized in that: The end of the arc-shaped part (61) has a plurality of radially arranged slots (611) along the axial direction of the spiral shaft (3).

3. A coal mine sampling device according to claim 2, characterized in that: The reinforcing ribs (6) are provided in multiple ways, and the slots (611) opened on the arc-shaped portions (61) of the multiple reinforcing ribs (6) are staggered in the axial direction.

4. A coal mine sampling device according to claim 3, characterized in that: The multiple reinforcing ribs (6) are distributed circumferentially along the helical axis (3).

5. A coal mine sampling device according to claim 4, characterized in that: The output end of the power source (5) is directly connected to one end of the spiral shaft (3) via a coupling.

6. A coal mine sampling device according to claim 5, characterized in that: The sampling tube (1) is also provided with a conical head or drill bit for breaking into the coal seam at one end away from the power source (5).

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