Sectional type quality detection sampling equipment applied to coal mining

Abstract

The invention relates to the technical field of coal sampling, and discloses sectional type quality detection sampling equipment applied to coal mining, which comprises an outer sleeve, a sample outlet pipe is connected to the outer wall, close to the upper end, of the outer sleeve, a driving motor is fixed above the outer sleeve, a main shaft is connected to an output shaft of the driving motor, and a spiral plate I is connected to the outer wall of the main shaft; the main shaft is sleeved with an inner sleeve, the inner wall of the inner sleeve is attached to the first spiral plate, the outer wall of the inner sleeve is connected with a second spiral plate, the second spiral plate is attached to the inner wall of the outer sleeve, a sample outlet hole is formed in the upper end of the sleeve wall of the inner sleeve, a sample inlet hole is formed in the lower end of the sleeve wall of the inner sleeve, and a one-way locking assembly is arranged between the inner sleeve and the main shaft. Through the design of the double-layer sleeve, when non-stratified sampling is needed, the main shaft rotates forwards, the second spiral plate lifts a sample to the sample outlet pipe to be discharged, when specific-depth sampling is needed, the first spiral plate rotates backwards, the first spiral plate lifts the sample to the sample outlet hole, and the requirements of non-stratified sampling and specific-depth sampling are met at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of coal sampling, and particularly to a sampling device for sectional quality inspection applied to coal mining. Background Art

[0002] A coal spiral sampler is a mechanized and automated device for sampling bulk materials such as coal and ore, mainly used to obtain representative samples for quality inspection. Its core working component is a high-speed rotating spiral drill bit. The drill bit is driven by a hydraulic or electric system and can vertically penetrate the entire depth of the material pile (or carriage) to achieve sampling of the entire cross-section and full depth.

[0003] In the patent with the publication number CN215178715U, a coal sampler for mining is disclosed, which relates to the technical field of coal sampling. Specifically, it is a coal sampler for mining, including a sampler body. The bottom of the sampler body is fixedly connected with a threaded sleeve, and the surface of the threaded sleeve is threadedly sleeved with an inner cylinder. A limiting chute is opened on the surface of the inner cylinder, a limiting ring is fixedly connected to the side of the bottom of the inner cylinder, an extension cylinder is movably sleeved on the surface of the inner cylinder, a retaining ring is fixedly sleeved at one end of the inner cavity of the extension cylinder, and a slider is fixedly connected to the inner cavity of the retaining ring. One end of the slider slides into the inner cavity of the limiting chute. For this coal sampler for mining, through the use of the threaded sleeve, the inner cylinder is threadedly sleeved by the threaded sleeve, and then the inner cylinder is installed. After sampling, the inner cylinder is rotated to remove the inner cylinder, which is convenient for cleaning the surface of the spiral conveyor rod and the inner wall of the inner cylinder.

[0004] The existing technology has the following defects: Although the existing coal spiral samplers have significant advantages in obtaining representative samples of the full depth, their core design determines that they cannot achieve selective sampling of specific depth coal seams, which is a key limitation of their current technical architecture. This limitation stems from their inherent working mode: Forced continuous cutting and lifting mechanism: The spiral sampler relies on a continuously rotating spiral drill rod to penetrate the entire depth of the material pile or carriage. The spiral blades start contacting the material from the top and continuously cut, break, and convey the material upward until the drill bit reaches the bottom. This process is an uninterrupted continuous physical conveying flow. Once started, all materials at all depths along the drill bit path will be cut, mixed, and lifted to the top. The device itself lacks a mechanism to start or stop cutting and lifting at a specific depth (such as only taking a 1-meter-thick coal seam in the middle).

[0005] Material mixing is inevitable: As the auger drill penetrates downward and ascends upward, materials at different depths inevitably mix within the spiral groove. Even if sampling begins only after the drill reaches the target depth, material from the upper layers it passes through during its ascent will be entrained in the sample flow. Similarly, if the drill attempts to stop at the target depth and sample only that depth, the spiral blade structure cannot effectively isolate material above and below that depth, and stopping rotation could cause the drill bit to become stuck or clogged.

[0006] Lack of deep, precise isolation technology: Existing equipment uses a top-mounted sampling and collection system, processing a stream of material mixed and transported from the entire depth of the borehole. The equipment lacks the technical means to isolate the material at a specific depth within the borehole, collect that layer, and independently transport it to the surface (e.g., an openable, deep isolation chamber, a segmented spiral, or independent channels). Summary of the Invention

[0007] In view of the above problems in the prior art, a segmented quality inspection sampling device for coal mining is proposed.

[0008] The present application provides a segmented quality inspection sampling device for coal mining, the purpose of which is to solve the problem that the existing spiral sampler cannot sample coal seams at a specific depth.

[0009] The technical solution of the present invention is: a sectional quality inspection sampling device for coal mining, comprising an outer sleeve, a sample outlet tube connected to the outer wall of the outer sleeve near the upper end, a driving motor fixed above the outer sleeve, an output shaft of the driving motor connected to a main shaft, an outer wall of the main shaft connected to a spiral plate 1, an inner sleeve sleeved on the main shaft, an inner wall of the inner sleeve abutting against the spiral plate 1, an outer wall of the inner sleeve connected to a spiral plate 2, the spiral plate 2 abutting against the inner wall of the outer sleeve, a sample outlet hole provided at the upper end of the barrel wall of the inner sleeve, a sample inlet hole provided at the lower end of the barrel wall of the inner sleeve, a one-way locking assembly provided between the inner sleeve and the main shaft, and the spiral directions of the spiral plate 1 and the spiral plate 2 are opposite; When the main shaft rotates forward, spiral plate 1 and spiral plate 2 rotate forward synchronously; when the main shaft rotates reversely, spiral plate 1 rotates reversely and spiral plate 2 stops.

[0010] With this solution and the dual-sleeve design, when unstratified sampling is required, the main shaft rotates forward, and spiral plates one and two rotate synchronously forward. Spiral plate two lifts the sample to the sample outlet tube for discharge. When sampling at a specific depth is required, the main shaft rotates forward first, advancing the outer sleeve to the required depth. The main shaft is then reversed, and a one-way locking assembly rotates spiral plate one, while spiral plate two remains stationary. The sample at the target depth then enters the inner sleeve through the sample inlet, is lifted to the sample outlet by spiral plate one, and then discharged from the sample outlet tube. This simultaneously meets the needs of both unstratified sampling and sampling at a specific depth.

[0011] Further, the one-way locking assembly includes a frustum fixedly sleeved on the upper end of the main shaft. The inner sleeve is mounted on the frustum. The upper end face of the frustum is provided with a first ratchet surface, and the top of the inner cavity of the inner sleeve is provided with a second ratchet surface. The first ratchet surface is engaged with the second ratchet surface. A spring is arranged at the top of the inner sleeve, and the spring abuts against the inner sleeve and the outer sleeve respectively.

[0012] With the above solution, through the one-way locking assembly, when the main shaft rotates forward, the first ratchet surface is engaged with the second ratchet surface, and the first spiral plate and the second spiral plate rotate forward synchronously. When the main shaft rotates reversely, the first ratchet surface is disengaged from the second ratchet surface, the first spiral plate rotates reversely, and the second spiral plate remains stationary.

[0013] Further, opening and closing assemblies are arranged at both the sample outlet hole and the sample inlet hole; The opening and closing assembly includes sliding grooves respectively arranged at the sample outlet hole and the sample inlet hole and embedded in the inner sleeve wall. An arc plate is slidably arranged in the sliding groove. A blocking plate is vertically arranged on the outer side of the arc plate, and a friction strip is arranged on the inner side of the arc plate. The friction strip is in contact with the edge of the first spiral plate; When the main shaft rotates forward, both the sample outlet hole and the sample inlet hole are in a closed state through the arc plate. When the main shaft rotates reversely, both the sample outlet hole and the sample inlet hole are in an open state.

[0014] With the above solution, by arranging the opening and closing assembly, when the main shaft rotates forward, the sample on the second spiral plate pushes the blocking plate, causing the arc plate to slide in the sliding groove until the sample outlet hole and the sample inlet hole are closed. When the main shaft rotates reversely, the first spiral plate drives the arc plate to slide reversely in the sliding groove through the frictional force between the first spiral plate and the friction strip until the sample outlet hole and the sample inlet hole are opened; in this way, the sample outlet hole and the sample inlet hole are only opened when it is necessary to take samples at a specific depth, avoiding the mixing of samples at different depths into the inner sleeve and causing inaccurate sampling.

[0015] Further, a drill bit is connected to the lower end of the main shaft.

[0016] With the above solution, by arranging the drill bit, it is easier for the second spiral plate to drill into the coal seam.

[0017] Further, a handrail is connected to the driving motor.

[0018] With the above solution, by arranging the handrail, it is used to apply a pressing force downward.

[0019] Further, the sample outlet pipe is arranged to incline downward.

[0020] With the above solution, by arranging the sample outlet pipe to incline downward, it is easier for the sample to be discharged.

[0021] Further, a pair of mutually hinged partition plates are arranged inside the outer sleeve. The direction of the partition plates is parallel to the axial direction of the sampling tube. The partition plate close to the sampling tube can be turned upwards, and the partition plate close to the sampling tube is tangent to the lower side of the inner wall of the sampling tube.

[0022] With the above scheme, by setting the partition plate that can be turned upwards, when non-stratified sampling is required, the second spiral plate lifts the sample to the partition plate, causing the partition plate to open upwards, and the sample is discharged from the sampling tube.

[0023] Further, the sampling hole is arranged above the partition plate.

[0024] With the above scheme, when sampling at a specific depth is required, the first spiral plate lifts the sample to the sampling hole, and then slides into the sampling tube from above the closed partition plate for discharge, avoiding the mixing of samples at different depths.

[0025] The beneficial effects of the present invention: Through the design of the double-layer sleeve, when non-stratified sampling is required, the main shaft rotates forward, and the first spiral plate and the second spiral plate rotate forward synchronously. The second spiral plate lifts the sample to the sampling tube for discharge. When sampling at a specific depth is required, first make the main shaft rotate forward to make the outer sleeve drive to the required depth, and then reverse the main shaft. Through the one-way locking component, make the first spiral plate reverse and the second spiral plate stand still. In this way, the sample at the target depth enters the inner sleeve through the sampling hole, and the first spiral plate lifts the sample to the sampling hole and then discharges it through the sampling tube. The requirements of both non-stratified sampling and sampling at a specific depth are met at the same time.

[0026] By setting the opening and closing component, when the main shaft rotates forward, the sample on the second spiral plate pushes the blocking plate, causing the arc-shaped plate to slide in the sliding groove until the sampling hole and the sampling hole are closed. When the main shaft rotates reversely, the first spiral plate drives the arc-shaped plate to slide reversely in the sliding groove through the friction force with the friction strip until the sampling hole and the sampling hole are opened; in this way, the sampling hole and the sampling hole are only opened when samples at a specific depth need to be taken, avoiding the mixing of samples at different depths into the inner sleeve and causing inaccurate sampling. Description of the drawings

[0027] Figure 1 is a perspective view of the sampling device for sectional quality inspection applied to coal mining according to the present invention; Figure 2 is a top view of the sampling device for sectional quality inspection applied to coal mining according to the present invention; Figure 3 is of the present invention Figure 2 Cross-sectional view at A-A in Figure 4 is a front view of the sampling device for sectional quality inspection applied to coal mining according to the present invention; Figure 5 is of the present invention Figure 4Cross-sectional view taken along line B-B; Figure 6 of the present invention Figure 5 partial enlarged view; Figure 7 is a three-dimensional view of the inner sleeve and the attachment member in the sectionalized quality inspection sampling device for coal mining applied to the present invention; Figure 8 is a half-sectional three-dimensional view of the one-way locking assembly in the sectionalized quality inspection sampling device for coal mining applied to the present invention; Figure 9 is a three-dimensional view of the arc plate in the sectionalized quality inspection sampling device for coal mining applied to the present invention.

[0028] In the figure: 1. Outer sleeve; 2. Sampling tube; 3. Driving motor; 4. Main shaft; 5. First spiral plate; 6. Inner sleeve; 7. Second spiral plate; 8. Sampling hole; 9. Sampling inlet hole; 10. One-way locking assembly; 11. Frustum; 12. First ratchet surface; 13. Second ratchet surface; 14. Spring; 15. Opening and closing assembly; 16. Sliding groove; 17. Arc plate; 18. Obstructing plate; 19. Friction strip; 20. Drill bit; 21. Armrest; 22. Partition plate. Specific embodiments

[0029] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0030] Example, referring to Figures 1-9 , which is an embodiment of the present invention, provides a sectionalized quality inspection sampling device for coal mining, including an outer sleeve 1, a sampling tube 2 is connected to the outer wall of the outer sleeve 1 near the upper end, a driving motor 3 is fixed above the outer sleeve 1, a main shaft 4 is connected to the output shaft of the driving motor 3, a first spiral plate 5 is connected to the outer wall of the main shaft 4, an inner sleeve 6 is sleeved on the main shaft 4, the inner wall of the inner sleeve 6 is in contact with the first spiral plate 5, a second spiral plate 7 is connected to the outer wall of the inner sleeve 6, the second spiral plate 7 is in contact with the inner wall of the outer sleeve 1, a sampling hole 8 is provided at the upper end of the barrel wall of the inner sleeve 6, a sampling inlet hole 9 is provided at the lower end of the barrel wall of the inner sleeve 6, and a one-way locking assembly 10 is provided between the inner sleeve 6 and the main shaft 4.

[0031] Specifically, the overall device uses the outer sleeve 1 as the main frame, and a sample outlet tube 2 is connected to the outer wall near the upper end. The sample outlet tube 2 forms a diversion channel with the inner part of the outer sleeve 1, and a detachable filter screen can be configured at the outlet end of the sample outlet 2 for preliminary separation of large impurities in the sample. The top of the outer sleeve 1 is fixed with a drive motor 3 through a flange structure, and the motor output shaft and the main shaft 4 are spline-connected to ensure effective torque transmission while facilitating disassembly and maintenance. The spiral plate 5 provided on the outer wall of the main shaft 4 can adopt a variable pitch design, and its pitch gradually decreases from bottom to top to enhance the lifting efficiency of the sample.

[0032] The inner sleeve 6 is mounted externally to the main shaft 4, maintaining a slight gap between its inner wall and spiral plate 1 5, ensuring smooth relative rotation and preventing sample leakage. Spiral plate 2 7 on the outer wall of the inner sleeve 6 forms a sliding seal with the inner wall of the outer sleeve 1. The spiral direction of spiral plate 2 7 is opposite to that of spiral plate 1 5. This counter-spiral design enables differentiated material transport in different rotation directions. The sample outlet 8 and sample inlet 9 on the inner sleeve 6 wall both utilize a waist-shaped hole structure.

[0033] During operation, when non-stratified sampling is required, the main shaft 4 rotates forward to drive the spiral plate 1 5 and the spiral plate 2 7 to rotate synchronously. The spiral plate 2 7 lifts the coal sample along the inner wall of the outer sleeve 1 and discharges it through the sample outlet tube 2. If sampling at a specific depth is required, the main shaft 4 is first rotated forward to drive the outer sleeve 1 to the target depth, and then the main shaft 4 is reversed. At this time, the spiral plate 2 7 remains stationary under the action of the one-way locking assembly 10. The sample at the target depth enters the inner sleeve 6 from the sampling hole 9. The reversed spiral plate 1 5 lifts the sample through the sample outlet hole 8 and discharges it from the sample outlet tube 2. This design, through the cooperation of the double-layer sleeve and the one-way transmission mechanism, can achieve both rapid sampling of the entire layer and accurate acquisition of samples at a specific depth, effectively improving the sampling flexibility and accuracy of coal quality testing, avoiding the mixing of samples from different coal seams, and meeting diverse sampling needs.

[0034] Reference Figure 3 and Figure 8 The one-way locking assembly 10 includes a truncated cone 11 fixedly mounted on the upper end of the main shaft 4, the inner sleeve 6 is mounted on the truncated cone 11, the upper end surface of the truncated cone 11 is provided with a ratchet surface 12, and the top of the inner cavity of the inner sleeve 6 is provided with a ratchet surface 2 13, the ratchet surface 12 is meshed with the ratchet surface 2 13, and a spring 14 is provided on the top of the inner sleeve 6, which respectively resists the inner sleeve 6 and the outer sleeve 1.

[0035] Through the one-way locking assembly 10, when the main shaft 4 rotates forward, the ratchet surface 12 and the ratchet surface 2 13 are engaged, and the spiral plate 1 5 and the spiral plate 2 7 rotate forward synchronously. When the main shaft 4 rotates reversely, the ratchet surface 12 and the ratchet surface 2 13 are disengaged, the spiral plate 1 5 rotates reversely, and the spiral plate 2 7 stops.

[0036] Reference Figures 3-6, the opening and closing assembly 15 includes sliding grooves 16 respectively arranged at the sample outlet hole 8 and the sample inlet hole 9 and embedded in the wall of the inner sleeve 6. An arc plate 17 is slidably arranged in the sliding groove 16. A blocking plate 18 is vertically arranged on the outer side of the arc plate 17, and a friction strip 19 is arranged on the inner side of the arc plate 17. The friction strip 19 is in contact with the edge of the first spiral plate 5.

[0037] Specifically, the sliding groove 16 is embedded radially along the wall of the inner sleeve 6, and its inner wall is formed into a smooth guiding surface through precision grinding to ensure uniform resistance when the arc plate 17 slides in the sliding groove 16; the arc plate 17 is cast from wear-resistant high manganese steel. The outer blocking plate 18 has a right trapezoidal structure, and its plate surface perpendicular to the axis of the inner sleeve 6 can effectively receive the lateral thrust generated when the second spiral plate 7 conveys the sample. The inner friction strip 19 is compound-pressed by silicon carbide particles and rubber, and the surface is densely covered with micron-level convex ridges, maintaining a proper pressing state with the outer edge of the first spiral plate 5. It can drive the arc plate 17 to slide through the frictional force when the main shaft 4 rotates reversely, and avoid excessive wear when rotating forward. When the main shaft 4 rotates forward to drive the second spiral plate 7 to lift the sample, the coal flow impacts the inclined surface of the blocking plate 18, generating a component force along the radial direction of the sliding groove 16 to push the arc plate 17 to rotate along the central axis of the inner sleeve 6 until the sample outlet hole 8 and the sample inlet hole 9 are tightly closed. At this time, the top of the blocking plate 18 does not contact the inner wall of the outer sleeve 1 to prevent interference during high-speed rotation; when the main shaft 4 rotates reversely, the edge of the first spiral plate 5 rotating in the reverse direction generates a tangential frictional force with the friction strip 19, and this frictional force is converted into a sliding driving force through the radial extension structure of the arc plate 17, so that the arc plate 17 retreats outward along the sliding groove 16 to the limit position. At this time, the sample outlet hole 8 and the sample inlet hole 9 are completely exposed, and the sample at the target depth can smoothly enter the inner sleeve 6. Copper-based wear-resistant pads are arranged at both ends of the sliding groove 16, which can not only buffer the impact when the arc plate 17 arrives, but also discharge the coal powder particles infiltrated into the sliding groove 16 along with the sample flow through the diversion grooves on the pads to ensure the long-term stable operation of the opening and closing mechanism. This pure mechanical opening and closing design without electronic control components, through the ingenious coupling of the rotation direction of the spiral plate and the frictional force, eliminates the problem of sample mixing at different depths during the sampling process from the structural level, and significantly improves the accuracy of sampling at a specific depth.

[0038] Refer to Figure 3 , a drill bit 20 is connected to the lower end of the main shaft 4. By setting the drill bit 20, it is easier for the second spiral plate 7 to drill into the coal seam.

[0039] Refer to Figure 1 , a handrail 21 is connected to the driving motor 3.

[0040] By setting the handrail 21, it is used to apply a pressing force downward.

[0041] Refer to Figure 1 , the sample outlet pipe 2 is arranged to incline downward.

[0042] The sample outlet tube 2 is tilted downward to facilitate sample discharge.

[0043] Reference Figure 3 A pair of mutually hinged isolation plates 22 are provided in the outer sleeve 1. The direction of the isolation plates 22 is parallel to the axial direction of the sample outlet tube 2. The isolation plate 22 close to the side of the sample outlet tube 2 can be flipped upward, and the isolation plate 22 close to the side of the sample outlet tube 2 is tangent to the lower side of the inner wall of the sample outlet tube 2.

[0044] By providing the upwardly flippable isolation plate 22 , when non-stratified sampling is required, the spiral plate 2 7 lifts the sample to the isolation plate 22 , causing the isolation plate 22 to open upward, and the sample is discharged from the sample outlet tube 2 .

[0045] Reference Figure 3 and Figure 7 The sample outlet 8 is arranged above the isolation plate 22 .

[0046] When sampling at a specific depth is required, the sample is lifted to the sample outlet 8 by the spiral plate 15, and then slides into the sample outlet tube 2 from above the closed isolation plate 22 to be discharged, thereby avoiding mixing of samples at different depths.

[0047] Working principle of the present invention: When non-stratified sampling is required, the drive motor 3 is started to rotate the main shaft 4 forward. At the same time, the handrail 21 is held and pressed down. The outer sleeve 1 gradually penetrates into the coal seam. The ratchet surface 12 is engaged with the ratchet surface 2 13. The spiral plate 1 5 and the spiral plate 2 7 rotate forward synchronously. At the same time, the sample on the spiral plate 2 7 pushes the obstruction plate 18 to make the arc plate 17 slide in the sliding groove 16 until the sample outlet 8 and the sample inlet 9 are closed. The spiral plate 2 7 lifts the sample to the sample outlet tube 2 for discharge. When sampling at a specific depth is required, the main shaft 4 is first rotated forward to make the outer sleeve 1 dig forward. When the sample reaches the required depth, the main shaft 4 is reversed, and the ratchet surface 12 and the ratchet surface 2 13 are disengaged, so that the spiral plate 15 is reversed and the spiral plate 2 7 is stationary. At the same time, the spiral plate 15 drives the arc plate 17 to slide in the opposite direction in the sliding groove 16 through the friction between the spiral plate 15 and the friction strip 19 until the sample outlet 8 and the sample injection hole 9 are opened. In this way, the sample at the target depth enters the inner sleeve 6 through the sample injection hole 9, and is lifted to the sample outlet 8 by the spiral plate 15, and then discharged from the sample outlet tube 2, thereby meeting the needs of non-stratified sampling and sampling at a specific depth.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sampling device for sectional quality inspection applied to coal mining, comprising an outer sleeve (1), a sample outlet pipe (2) connected to the outer wall of the outer sleeve (1) near the upper end, and a driving motor (3) fixed above the outer sleeve (1), characterized in that: A main shaft (4) is connected to the output shaft of the drive motor (3). A first spiral plate (5) is connected to the outer wall of the main shaft (4). An inner sleeve (6) is sleeved on the main shaft (4). The inner wall of the inner sleeve (6) is in contact with the first spiral plate (5). A second spiral plate (7) is connected to the outer wall of the inner sleeve (6). The second spiral plate (7) is in contact with the inner wall of the outer sleeve (1). A sample outlet hole (8) is provided at the upper end of the barrel wall of the inner sleeve (6), and a sample inlet hole (9) is provided at the lower end of the barrel wall of the inner sleeve (6). A one-way locking assembly (10) is provided between the inner sleeve (6) and the main shaft (4). The spiral directions of the first spiral plate (5) and the second spiral plate (7) are opposite; When the main shaft (4) rotates forward, the first spiral plate (5) and the second spiral plate (7) rotate forward synchronously; when the main shaft (4) rotates reversely, the first spiral plate (5) rotates reversely and the second spiral plate (7) remains stationary.

2. The sampling device for sectional quality inspection applied to coal mining according to claim 1, characterized in that: The one-way locking assembly (10) includes a frustum (11) fixedly sleeved on the upper end of the main shaft (4). The inner sleeve (6) is mounted on the frustum (11). A first ratchet surface (12) is provided on the upper end surface of the frustum (11). A second ratchet surface (13) is provided at the top of the inner cavity of the inner sleeve (6). The first ratchet surface (12) meshes with the second ratchet surface (13). A spring (14) is provided at the top of the inner sleeve (6). The spring (14) abuts against the inner sleeve (6) and the outer sleeve (1) respectively.

3. The sampling device for sectional quality inspection applied to coal mining according to claim 1, characterized in that: Opening and closing assemblies (15) are provided at both the sample outlet hole (8) and the sample inlet hole (9); The opening and closing assembly (15) includes sliding grooves (16) respectively provided at the sample outlet hole (8) and the sample inlet hole (9) and embedded in the wall of the inner sleeve (6). An arc-shaped plate (17) is slidably provided in the sliding groove (16). A blocking plate (18) is vertically provided on the outer side of the arc-shaped plate (17). A friction strip (19) is provided on the inner side of the arc-shaped plate (17). The friction strip (19) is in contact with the edge of the first spiral plate (5); When the main shaft (4) rotates forward, both the sample outlet hole (8) and the sample inlet hole (9) are in a closed state through the arc-shaped plate (17). When the main shaft (4) rotates reversely, both the sample outlet hole (8) and the sample inlet hole (9) are in an open state.

4. The sampling device for sectional quality inspection applied to coal mining according to claim 1, characterized in that: A drill bit (20) is connected to the lower end of the main shaft (4).

5. The sampling device for sectional quality inspection applied to coal mining according to claim 1, characterized in that: A handrail (21) is connected to the drive motor (3).

6. The sampling device for sectional quality inspection applied to coal mining according to claim 1, characterized in that: The sample outlet pipe (2) is arranged to incline downward.

7. The sampling device for sectional quality inspection applied to coal mining according to claim 1, wherein: A pair of mutually hinged partition plates (22) are arranged in the outer sleeve (1). The direction of the partition plates (22) is parallel to the axial direction of the sample outlet pipe (2). The partition plate (22) on the side close to the sample outlet pipe (2) can be turned upward. The partition plate (22) on the side close to the sample outlet pipe (2) is tangent to the lower side of the inner wall of the sample outlet pipe (2).

8. The sampling device for sectional quality inspection applied to coal mining according to claim 7, characterized in that: The sample outlet hole (8) is provided above the partition plate (22).

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