A sectional quality inspection sampling device for coal mining

Abstract

The present invention relates to the technical field of coal sampling, and discloses 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 drive motor fixed above the outer sleeve, a main shaft connected to the output shaft of the drive motor, a spiral plate 1 connected to the outer wall of the main shaft, an inner sleeve sleeved on the main shaft, the inner wall of the inner sleeve abutting against the spiral plate 1, a spiral plate 2 connected to the outer wall of the inner sleeve, 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, and a one-way locking assembly provided between the inner sleeve and the main shaft. Through the design of the double-layer sleeve, when non-stratified sampling is required, the main shaft rotates forward, and the spiral plate 2 lifts the sample to the sample outlet tube for discharge. When sampling at a specific depth is required, the spiral plate 1 is reversed, and the spiral plate 1 lifts the sample to the sample outlet hole, thereby meeting the requirements of non-stratified sampling and specific depth sampling at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of coal sampling, and in particular to a segmented quality detection sampling device used in coal mining. Background Art

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

[0003] The patent publication number CN215178715U discloses a coal sampler for mining, which relates to the field of coal sampling technology, specifically a coal sampler for mining, including a sampler body, the bottom of the sampler body is fixedly connected to a threaded sleeve, the surface of the threaded sleeve is threadedly sleeved with an inner cylinder, the surface of the inner cylinder is provided with a limiting slide groove, the side of the bottom of the inner cylinder is fixedly connected to a limiting ring, the surface of the inner cylinder is movably sleeved with an extension cylinder, one end of the inner cavity of the extension cylinder is fixedly sleeved with a retaining ring, the inner cavity of the retaining ring is fixedly connected to a slider, and one end of the slider is slidably connected to the inner cavity of the limiting slide groove. The coal sampler for mining, through the use of a threaded sleeve, uses the threaded sleeve to thread the inner cylinder, and then installs the inner cylinder. After sampling, the inner cylinder is removed by rotating the inner cylinder, which is convenient for cleaning the surface of the spiral feed rod and the inner wall of the inner cylinder.

[0004] The existing technology has the following defects:

[0005] Although existing coal spiral samplers have significant advantages in obtaining representative samples at all depths, their core design makes it impossible to selectively sample coal seams at specific depths. This is a key limitation of their current technical architecture. This limitation stems from their inherent working method:

[0006] Forced continuous cutting and lifting mechanism: The spiral sampler relies on a continuously rotating auger shaft to penetrate the entire depth of the pile or carriage. The spiral blades contact the material at the top and continuously cut, crush, and transport it upward until the drill bit reaches the bottom. This process is an uninterrupted, continuous physical flow. Once started, material at all depths along the drill bit's path is cut, mixed, and lifted to the top. The equipment itself lacks a mechanism to start or stop cutting and lifting at specific depths (e.g., sampling only a 1-meter-thick coal seam in the middle).

[0007] 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.

[0008] 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

[0009] In view of the above problems in the prior art, a segmented quality inspection sampling device for coal mining is proposed.

[0010] 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.

[0011] 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;

[0012] 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.

[0013] 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.

[0014] Furthermore, the one-way locking assembly includes a circular table fixedly mounted on the upper end of the main shaft, the inner sleeve is mounted on the circular table, the upper end face of the circular table is provided with a ratchet surface 1, the top of the inner cavity of the inner sleeve is provided with a ratchet surface 2, the ratchet surface 1 is meshed with the ratchet surface 2, and a spring is provided on the top of the inner sleeve, which respectively resists the inner sleeve and the outer sleeve.

[0015] By adopting the above scheme, through the one-way locking assembly, when the main shaft rotates forward, the ratchet surface 1 and the ratchet surface 2 are engaged, and the spiral plate 1 and the spiral plate 2 rotate forward synchronously. When the main shaft rotates reversely, the ratchet surface 1 and the ratchet surface 2 are disengaged, the spiral plate 1 reverses, and the spiral plate 2 stops.

[0016] Furthermore, both the sample outlet and the sample inlet are provided with opening and closing components;

[0017] The opening and closing assembly includes sliding grooves respectively arranged at the sample outlet and the sample inlet and embedded in the wall of the inner sleeve, an arc-shaped plate is slidably arranged in the sliding groove, an obstruction plate is vertically arranged on the outer side of the arc-shaped plate, and a friction strip is arranged on the inner side of the arc-shaped plate, and the friction strip contacts the edge of the spiral plate;

[0018] When the main shaft rotates forward, the sample outlet and the sample inlet are both in a closed state through the arc plate. When the main shaft rotates reversely, the sample outlet and the sample inlet are both in an open state.

[0019] By adopting the above scheme and setting an opening and closing component, when the main shaft rotates forward, the sample on the spiral plate 2 pushes the obstruction plate, causing the arc plate to slide in the sliding groove until the sample outlet and the sample inlet are closed. When the main shaft is reversed, the spiral plate 1 drives the arc plate to slide in the sliding groove in the opposite direction through the friction between the spiral plate and the friction strip, until the sample outlet and the sample inlet are opened; in this way, the sample outlet and the sample inlet are only opened when it is necessary to take samples of a specific depth, thereby preventing samples of different depths from mixing into the inner sleeve, resulting in inaccurate sampling.

[0020] Furthermore, a drill bit is connected to the lower end of the main shaft.

[0021] By adopting the above solution and arranging a drill bit, the spiral plate 2 can be drilled into the coal seam more easily.

[0022] Furthermore, the drive motor is connected to an armrest.

[0023] With the above solution, an armrest is provided to apply downward pressing force.

[0024] Furthermore, the sample outlet tube is arranged to be tilted downward.

[0025] By adopting the above solution, the sample outlet tube is tilted downward, so that the sample can be discharged more easily.

[0026] Furthermore, a pair of mutually hinged isolation plates are provided in the outer sleeve, the direction of the isolation plates is parallel to the axial direction of the sample outlet tube, the isolation plate close to the sample outlet tube side can be flipped upward, and the isolation plate close to the sample outlet tube side is tangent to the lower side of the inner wall of the sample outlet tube.

[0027] By adopting the above solution, by setting an upwardly flippable isolation plate, when non-stratified sampling is required, the spiral plate 2 lifts the sample to the isolation plate, opens the isolation plate upward, and the sample is discharged from the sample outlet tube.

[0028] Furthermore, the sample outlet is arranged above the isolation plate.

[0029] With the above solution, when sampling at a specific depth is required, the spiral plate lifts the sample to the sample outlet hole, and then slides it into the sample outlet tube from above the closed isolation plate to be discharged, thus avoiding mixing of samples at different depths.

[0030] Beneficial effects of the present invention:

[0031] The double-sleeve design allows for unstratified sampling when the main shaft rotates forward, while spiral plates one and two rotate synchronously. Screw plate two lifts the sample to the sample outlet tube for discharge. To sample at a specific depth, the main shaft rotates forward to advance the outer sleeve to the desired depth. The main shaft is then reversed, and a one-way locking assembly rotates spiral plate one, leaving spiral plate two stationary. The sample at the target depth enters the inner sleeve through the inlet, where it is lifted to the sample outlet by spiral plate one and discharged from the sample outlet tube. This allows for both unstratified sampling and sampling at a specific depth.

[0032] By setting up an opening and closing component, when the main shaft rotates forward, the sample on the spiral plate 2 pushes the obstruction plate, causing the arc plate to slide in the sliding groove until the sample outlet and the sample injection hole are closed. When the main shaft is reversed, the spiral plate 1 drives the arc plate to slide in the sliding groove in the opposite direction through the friction between the spiral plate and the friction strip, until the sample outlet and the sample injection hole are opened. In this way, the sample outlet and the sample injection hole are only opened when it is necessary to take samples of a specific depth, thereby preventing samples of different depths from mixing into the inner sleeve, resulting in inaccurate sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A perspective view of a segmented quality inspection sampling device for coal mining according to the present invention;

[0034] Figure 2 A top view of a segmented quality inspection sampling device for coal mining according to the present invention;

[0035] Figure 3 For the present invention Figure 2 Cross-sectional view at AA in the middle;

[0036] Figure 4It is a front view of the sectional quality inspection sampling device used in coal mining according to the present invention;

[0037] Figure 5 For the present invention Figure 4 Cross-sectional view at the middle BB;

[0038] Figure 6 For the present invention Figure 5 A partial enlarged view of

[0039] Figure 7 A three-dimensional diagram of an inner sleeve and attachments in a segmented quality inspection sampling device for coal mining according to the present invention;

[0040] Figure 8 A half-section perspective view of a one-way locking assembly in a segmented quality inspection sampling device for coal mining according to the present invention;

[0041] Figure 9 This is a three-dimensional diagram of the curved plate in the segmented quality inspection sampling equipment used in coal mining according to the present invention.

[0042] In the picture:

[0043] 1. Outer sleeve; 2. Sample outlet tube; 3. Drive motor; 4. Spindle; 5. Spiral plate 1; 6. Inner sleeve; 7. Spiral plate 2; 8. Sample outlet hole; 9. Sample inlet hole; 10. One-way locking assembly; 11. Cone; 12. Ratchet surface 1; 13. Ratchet surface 2; 14. Spring; 15. Opening and closing assembly; 16. Sliding groove; 17. Arc plate; 18. Obstruction plate; 19. Friction strip; 20. Drill bit; 21. Handrail; 22. Isolation plate. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] Example, see Figure 1-9 , an embodiment of the present invention provides a segmented quality inspection sampling device for coal mining, including an outer sleeve 1, a sample outlet tube 2 is connected to the outer wall of the outer sleeve 1 near the upper end, a drive motor 3 is fixed above the outer sleeve 1, the output shaft of the drive motor 3 is connected to the main shaft 4, the outer wall of the main shaft 4 is connected to a spiral plate 1 5, an inner sleeve 6 is sleeved on the main shaft 4, the inner wall of the inner sleeve 6 is in contact with the spiral plate 1 5, the outer wall of the inner sleeve 6 is connected to a spiral plate 2 7, the spiral plate 2 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 wall of the inner sleeve 6, a sample inlet hole 9 is provided at the lower end of the wall of the inner sleeve 6, and a one-way locking component 10 is provided between the inner sleeve 6 and the main shaft 4.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Reference Figure 3-Figure 6The opening and closing component 15 includes a sliding groove 16 respectively arranged at the sample outlet 8 and the sample inlet 9 and embedded in the wall of the inner sleeve 6. An arc plate 17 is slidably arranged in the sliding groove 16. An obstruction plate 18 is vertically arranged on the outside of the arc plate 17. A friction strip 19 is arranged on the inside of the arc plate 17. The friction strip 19 contacts the edge of the spiral plate 5.

[0052] Specifically, the sliding groove 16 is radially embedded along the wall of the inner sleeve 6, and its inner wall is precisely ground to form a smooth guide surface to ensure that the arc plate 17 has uniform resistance when sliding in the sliding groove 16; the arc plate 17 is cast with wear-resistant high manganese steel, and the outer obstruction plate 18 is a right-angled trapezoidal structure. The plate surface perpendicular to the axis of the inner sleeve 6 can effectively bear the lateral thrust generated by the spiral plate 2 7 when transporting the sample, and the inner friction strip 19 is made of silicon carbide particles and rubber composite pressed, and the surface is densely covered with micron-level ridges, which maintains a moderate compression state with the outer edge of the spiral plate 1 5, which can not only drive the arc plate 17 to slide through friction when the main shaft 4 is reversed, but also avoid excessive wear during forward rotation. When spindle 4 rotates forward, driving spiral plate 2 (7) to lift the sample, the coal flow impacts the inclined surface of obstruction plate 18, generating a radial force component along sliding groove 16 that pushes curved plate 17 along the central axis of inner sleeve 6 until the sample outlet 8 and sample inlet 9 are tightly sealed. At this point, the top of obstruction plate 18 is free from contact with the inner wall of outer sleeve 1, preventing interference during high-speed rotation. When spindle 4 rotates counterclockwise, the counter-rotating edge of spiral plate 1 (5) generates tangential friction with friction strip 19. This friction is converted into a sliding driving force by the radial extension of curved plate 17, causing curved plate 17 to retreat outward along sliding groove 16 to its limit position. At this point, the sample outlet 8 and sample inlet 9 are fully exposed, allowing the sample at the target depth to enter inner sleeve 6 smoothly. Copper-based wear-resistant pads are installed at both ends of sliding groove 16 to cushion the impact of curved plate 17 when it is in place and to drain coal particles that have infiltrated sliding groove 16 along with the sample flow through the guide grooves on the pads, ensuring long-term stable operation of the opening and closing mechanism. This purely mechanical opening and closing design, which does not require any electronic control components, eliminates the problem of mixing of samples at different depths during the sampling process from a structural level through the clever coupling of the spiral plate's rotation direction and friction, significantly improving the accuracy of sampling at a specific depth.

[0053] Reference Figure 3 The lower end of the main shaft 4 is connected with a drill bit 20. By arranging the drill bit 20, the spiral plate 2 7 is more easily drilled into the coal seam.

[0054] Reference Figure 1 The driving motor 3 is connected to an armrest 21 .

[0055] The armrest 21 is provided to apply a downward pressing force.

[0056] Reference Figure 1 , the sample outlet tube 2 is set to be tilted downward.

[0057] The sample outlet tube 2 is tilted downward to facilitate sample discharge.

[0058] 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.

[0059] 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 .

[0060] Reference Figure 3 and Figure 7 The sample outlet 8 is arranged above the isolation plate 22 .

[0061] 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.

[0062] Working principle of the present invention:

[0063] 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.

[0064] 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 segmented quality inspection used in coal mining, comprising an outer sleeve (1), a sample outlet tube (2) connected to the outer wall of the outer sleeve (1) near the upper end, and a drive motor (3) fixed above the outer sleeve (1), characterized in that: The output shaft of the driving motor (3) is connected to the main shaft (4), the outer wall of the main shaft (4) is connected to the spiral plate 1 (5), the main shaft (4) is sleeved with an inner sleeve (6), the inner wall of the inner sleeve (6) is in contact with the spiral plate 1 (5), the outer wall of the inner sleeve (6) is connected to the spiral plate 2 (7), the spiral plate 2 (7) is in contact with the inner wall of the outer sleeve (1), the upper end of the wall of the inner sleeve (6) is provided with a sample outlet hole (8), the lower end of the wall of the inner sleeve (6) is provided with a sample inlet hole (9), a one-way locking component (10) is provided between the inner sleeve (6) and the main shaft (4), and the spiral directions of the spiral plate 1 (5) and the spiral plate 2 (7) are opposite; When the main shaft (4) rotates forward, the spiral plate 1 (5) and the spiral plate 2 (7) rotate forward synchronously; when the main shaft (4) rotates reversely, the spiral plate 1 (5) rotates reversely and the spiral plate 2 (7) stops; The one-way locking assembly (10) includes a truncated cone (11) fixedly mounted on the upper end of the main shaft (4), an inner sleeve (6) mounted on the truncated cone (11), a ratchet surface 1 (12) provided on the upper end surface of the truncated cone (11), a ratchet surface 2 (13) provided on the top of the inner cavity of the inner sleeve (6), the ratchet surface 1 (12) meshing with the ratchet surface 2 (13), a spring (14) provided on the top of the inner sleeve (6), the spring (14) respectively abutting against the inner sleeve (6) and the outer sleeve (1); The sample outlet (8) and the sample inlet (9) are both provided with an opening and closing assembly (15); The opening and closing assembly (15) includes a sliding groove (16) respectively arranged at the sample outlet (8) and the sample inlet (9) and embedded in the wall of the inner sleeve (6), an arc plate (17) is slidably arranged in the sliding groove (16), an obstruction 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), and the friction strip (19) contacts the edge of the spiral plate (5); When the main shaft (4) rotates forward, the sample outlet hole (8) and the sample inlet hole (9) are both in a closed state through the arc plate (17); when the main shaft (4) rotates reversely, the sample outlet hole (8) and the sample inlet hole (9) are both in an open state.

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

3. The segmented quality inspection sampling device for coal mining according to claim 1 is characterized in that: The drive motor (3) is connected to an armrest (21).

4. The segmented quality inspection sampling device for coal mining according to claim 1 is characterized in that: The sample outlet pipe (2) is arranged to be tilted downward.

5. The segmented quality inspection sampling device for coal mining according to claim 1 is characterized in that: 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 plates (22) on the side close to the sample outlet tube (2) can be flipped upwards. The isolation plates (22) on the side close to the sample outlet tube (2) are tangent to the lower side of the inner wall of the sample outlet tube (2).

6. The segmented quality inspection sampling device for coal mining according to claim 5, characterized in that: The sample outlet hole (8) is arranged above the isolation plate (22).

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