A pulverized coal sampling device for detecting pulverized coal fineness

Abstract

The utility model relates to the technical field of coal powder sampling, and specifically discloses a coal powder sampling device for coal powder fineness detection, which comprises a horizontal plate, a sampling cylinder with open structures on both upper and lower sides is fixedly connected to the upper end of the horizontal plate, a sample inlet groove is formed through the left side of the outer wall of the sampling cylinder, a fixed frame is fixedly connected to the upper end of the horizontal plate, a fixed plate is fixedly connected inside the fixed frame, and a stepping motor is installed at the upper end of the fixed plate; when the positioning plate abuts against the upper surface of the coal powder layer, the center of the sample inlet groove reaches the target position, the length of insertion is estimated without relying on manual experience, the reliability of the sampling process is significantly improved, the sample inlet groove is closed by the reset semicircular blocking plate after sampling, the device is taken out and the blocking block is removed to obtain the coal powder sample, so that the coal powder layer with the target depth can be sampled according to the detection requirement, and the sampling deviation caused by gravity stratification is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of coal powder sampling technology, and specifically discloses a coal powder sampling device for detecting the fineness of coal powder. Background Technology

[0002] In heavy industrial applications involving pulverized coal, such as thermal power generation, steel smelting, chemical industry, and building materials, quality control during pulverized coal storage is crucial. Sampling and testing of stationary pulverized coal (such as pulverized coal accumulated in pulverized coal silos or storage tanks) is a core method for accurately assessing key quality indicators such as fineness, moisture content, and volatile matter. These indicators directly affect combustion efficiency, equipment operational stability, and pollutant emission control.

[0003] Traditional sampling of static coal powder mostly involves manual sampling with a sampling spoon or sampling through a sampling hole at the bottom of the coal powder silo. A significant drawback of both methods is that they can only obtain samples from the upper or lower layers of the coal powder. Because static coal powder inevitably undergoes particle size stratification under gravity (coarse particles sink, fine particles float), it is impossible to sample the coal powder layer at a specific depth, resulting in a large discrepancy between the sample particle size detection results and the actual situation.

[0004] Some sampling devices that can be inserted into the coal seam, such as hand-cranked spiral samplers, can penetrate deep into the coal dust pile, but the sampling depth cannot be directly controlled. The insertion length can only be estimated by human experience, resulting in poor reliability of the sampling process.

[0005] Therefore, a coal powder sampling device for detecting coal powder fineness is needed to solve the above problems. Utility Model Content

[0006] This invention proposes a coal powder sampling device for detecting the fineness of coal powder. It can sample coal powder layers at a target depth according to the detection requirements, effectively reducing sampling deviation caused by gravity stratification. At the same time, the device can intuitively display and control the sampling depth, avoiding reliance on manual experience to estimate the insertion length, and significantly improving the reliability of the sampling process.

[0007] This utility model is implemented as follows: a coal powder sampling device for detecting the fineness of coal powder includes a horizontal plate. A sampling cylinder with openings on both the upper and lower sides is fixedly connected to the upper end of the horizontal plate. A sample inlet groove is opened through the left side of the outer wall of the sampling cylinder. A fixing frame is fixedly connected to the upper end of the horizontal plate. A fixing plate is fixedly connected inside the fixing frame. A stepper motor is installed on the upper end of the fixing plate. The output end of the stepper motor passes through the fixing plate and is fixedly connected to a rotating shaft located inside the sampling cylinder. A connecting plate that fits against the inner wall of the sampling cylinder is fixedly connected to the lower end of the rotating shaft. A semi-circular sealing plate that fits against the inner wall of the sampling cylinder is fixedly connected to the lower end of the connecting plate.

[0008] A scale groove is provided on the right side of the outer wall of the sampling cylinder, and scale lines are provided inside the scale groove. A positioning plate is provided below the horizontal plate, and a locking mechanism is provided between the positioning plate and the sampling cylinder.

[0009] A sealing block is provided at the lower end of the sampling tube.

[0010] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, the locking mechanism includes a U-shaped groove that extends through the upper end of the positioning plate. Inside the U-shaped groove, a pressing block is slidably connected via two sliding grooves and two sliding blocks. The right end of the pressing block is rotatably connected to a screw rod that extends through the positioning plate and is threadedly connected to the positioning plate. The right end of the screw rod is fixedly connected to a torsion block. The arc-shaped surface of the inner wall of the U-shaped groove and the arc-shaped surface of the left end of the pressing block are both covered with an anti-slip layer.

[0011] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, a plurality of bearings distributed vertically are fixedly connected between the outer wall of the rotating shaft and the inner wall of the sampling cylinder.

[0012] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, the upper end of the sealing block is fixedly connected to an internal threaded cylinder that is threadedly connected to the outer wall of the sampling cylinder.

[0013] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, a partition is fixedly connected inside the fixed frame, a battery electrically connected to the stepper motor is installed at the upper end of the partition, and a manual controller electrically connected to the stepper motor is installed at the right end of the fixed frame.

[0014] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, the sealing block has a conical structure.

[0015] As a preferred embodiment of the coal powder sampling device for detecting the fineness of coal powder according to this utility model, handles are fixedly connected to both the left and right ends of the horizontal plate.

[0016] The beneficial effects of this utility model are:

[0017] 1. By moving the positioning plate up and down to align its bottom plane with the target scale line and fix it, the sampling depth can be displayed and controlled intuitively. When the positioning plate comes into contact with the upper surface of the coal powder layer, the center of the sampling groove reaches the target position, avoiding reliance on manual experience to estimate the insertion length and significantly improving the reliability of the sampling process.

[0018] 2. The operator inserts the sampling tube vertically into the coal powder layer until the bottom of the positioning plate touches the coal powder surface. The semi-circular sealing plate is rotated to expose the inlet groove, allowing coal powder at the target depth to enter the sampling tube. After sampling, the semi-circular sealing plate is reset to close the inlet groove. The device is then removed and the sealing block is unloaded to obtain the coal powder sample. This allows for sampling of the coal powder layer at the target depth according to the testing requirements, effectively reducing sampling deviation caused by gravity stratification. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a front cross-sectional view of the coal powder sampling device for detecting the fineness of coal powder according to the present invention.

[0021] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a partial top sectional view of the present invention;

[0023] Figure 4 This is a diagram showing the external structure of the connecting disc and the semi-circular sealing plate of this utility model.

[0024] Figure 5 This is a diagram showing the external structure of the sealing block and the internally threaded cylinder of this utility model.

[0025] The markings in the diagram are: 1. Horizontal plate; 2. Sampling cylinder; 3. Sample inlet groove; 4. Sealing block; 5. Internal threaded cylinder; 6. Rotating shaft; 7. Connecting plate; 8. Semi-circular sealing plate; 9. Bearing; 10. Fixing frame; 11. Fixing plate; 12. Stepper motor; 13. Battery; 14. Manual controller; 15. Scale groove; 16. Scale line; 17. Positioning plate; 18. U-shaped groove; 19. Clamping block; 20. Screw. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0027] Please see Figure 1-5A coal powder sampling device for detecting the fineness of coal powder includes a horizontal plate 1. A sampling cylinder 2 with openings on both the upper and lower sides is fixedly connected to the upper end of the horizontal plate 1. A sample inlet groove 3 is opened through the left side of the outer wall of the sampling cylinder 2. A fixing frame 10 is fixedly connected to the upper end of the horizontal plate 1. A fixing plate 11 is fixedly connected inside the fixing frame 10. A stepper motor 12 is installed on the upper end of the fixing plate 11. The output end of the stepper motor 12 passes through the fixing plate 11 and is fixedly connected to a rotating shaft 6 located inside the sampling cylinder 2. A connecting plate 7 that fits against the inner wall of the sampling cylinder 2 is fixedly connected to the lower end of the rotating shaft 6. A semi-circular sealing plate 8 that fits against the inner wall of the sampling cylinder 2 is fixedly connected to the lower end of the connecting plate 7.

[0028] A scale groove 15 is provided on the right side of the outer wall of the sampling cylinder 2. The scale groove 15 is provided with scale lines 16 inside. A positioning plate 17 is provided below the horizontal plate 1. A locking mechanism is provided between the positioning plate 17 and the sampling cylinder 2.

[0029] A sealing block 4 is provided at the lower end of the sampling tube 2.

[0030] In this embodiment: when the sampling device is not in use, the arc surface of the semi-circular sealing plate 8 is completely in contact with the inner wall of the sampling cylinder 2, completely sealing the sampling groove 3 to prevent external coal powder or debris from entering the sampling cylinder 2. At this time, a closed sampling space is formed between the sealing block 4 and the connecting plate 7.

[0031] According to the particle size detection requirements of a certain depth stratification in the coal powder silo, the operator releases the locking state of the positioning plate 17 through the locking mechanism, and then moves the positioning plate 17 up and down so that the bottom plane of the positioning plate 17 is aligned with the target scale line 16 in the scale groove 15. The value of the scale line 16 directly corresponds to the vertical distance from the center of the sample inlet 3 to the bottom of the positioning plate 17. The locking mechanism is then used to ensure that the position of the positioning plate 17 is fixed to avoid depth deviation during the sampling process.

[0032] The operator then vertically inserts the sampling cylinder 2 into the static coal powder layer. When the bottom end of the positioning plate 17 is in complete contact with the upper surface of the coal powder layer, the insertion is stopped. At this time, the center position of the sampling groove 3 corresponds exactly to the target depth marked on the scale line 16, ensuring accurate sampling position. In this way, the sampling depth can be displayed and controlled intuitively, avoiding reliance on manual experience to estimate the insertion length, and significantly improving the reliability of the sampling process.

[0033] Subsequently, the output shaft of the stepper motor 12 drives the rotating shaft 6 to rotate 180 degrees clockwise. The connecting plate 7 and the semi-circular sealing plate 8 rotate synchronously, so that the sample inlet 3 is fully exposed. At this time, the semi-circular sealing plate 8 rotates to the right side of the sampling cylinder 2 and no longer blocks the sample inlet 3. Then, the operator slightly rotates the horizontal plate 1 back and forth, using the shaking of the sampling cylinder 2 to disturb the coal powder, so that the coal powder at the target depth falls into the sampling cylinder 2 through the sample inlet 3 and accumulates in the space below the connecting plate 7. The bottom surface of the connecting plate 7 is in contact with the inner wall of the sampling cylinder 2, which can prevent the coal powder from leaking upward to the area of ​​the rotating shaft 6.

[0034] After sampling is completed, the semi-circular sealing plate 8 is reset to its initial position by the stepper motor 12, and the sample inlet 3 is completely blocked again. This step ensures that a closed space is formed inside the sampling cylinder 2 to prevent coal powder from leaking out of the sample inlet 3 during the extraction process. Then the device is vertically removed from the coal powder layer. The stepper motor 12 is driven by a worm gear, and the self-locking characteristic of the worm gear drive is used to prevent the semi-circular sealing plate 8 from shifting position.

[0035] Then the sealing block 4 is removed, the lower opening of the sampling cylinder 2 is opened, and the coal powder falls directly into the detection container under the action of gravity. Combined with the above working method, the coal powder layer at the target depth can be sampled according to the detection requirements, effectively reducing the sampling deviation caused by gravity stratification.

[0036] As a technical optimization of this utility model, the locking mechanism includes a U-shaped groove 18 that passes through the upper end of the positioning plate 17. Inside the U-shaped groove 18, a pressing block 19 is slidably connected via two sliding grooves and two sliding blocks. The right end of the pressing block 19 is rotatably connected to a screw 20 that passes through the positioning plate 17 and is threadedly connected to the positioning plate 17. The right end of the screw 20 is fixedly connected to a torsion block. The arc-shaped surface of the inner wall of the U-shaped groove 18 and the arc-shaped surface of the left end of the pressing block 19 are both covered with an anti-slip layer.

[0037] In this embodiment: When unlocking, the operator needs to rotate the torsion block at the right end of the screw 20 to make the screw 20 rotate, which will drive the clamping block 19 to move to the right and release the clamping state between the arc-shaped surface at the left end of the clamping block 19 and the outer wall of the sampling cylinder 2.

[0038] When the positioning plate 17 needs to be fixed, rotate the screw 20 in the opposite direction to push the clamping block 19 to the left. The sampling cylinder 2 is clamped by the anti-slip layer of the arc surface of the inner wall of the U-shaped groove 18 and the arc surface of the left end of the clamping block 19, so as to ensure that the positioning plate 17 is fixed and avoid depth deviation during the sampling process.

[0039] As a technical optimization of this utility model, multiple bearings 9 distributed vertically are fixedly connected between the outer wall of the rotating shaft 6 and the inner wall of the sampling cylinder 2.

[0040] In this embodiment, multiple bearings 9 provide multi-point support for the position of the rotating shaft 6, thereby improving the stability of the rotation of the rotating shaft 6.

[0041] As a technical optimization of this utility model, the upper end of the sealing block 4 is fixedly connected to an internally threaded cylinder 5 that is threaded to the outer wall of the sampling cylinder 2.

[0042] In this embodiment: by setting an internal threaded cylinder 5 and threading it to the outer wall of the sampling cylinder 2, the sealing block 4 can be easily disassembled and assembled.

[0043] As a technical optimization of this utility model, a partition is fixedly connected inside the fixed frame 10, and a battery 13 electrically connected to the stepper motor 12 is installed at the upper end of the partition. A manual controller 14 electrically connected to the stepper motor 12 is installed at the right end of the fixed frame 10.

[0044] In this embodiment: the battery 13 inside the fixed frame 10 supplies power to the stepper motor 12 through wires. The manual controller 14 integrates start, stop and turn buttons. When the "start" button of the manual controller 14 is pressed, the battery 13 outputs DC power to the stepper motor 12, driving the rotating shaft 6 to rotate forward or reverse. The rotation direction of the stepper motor 12 is controlled by the "forward, reverse" button, so as to accurately realize the 180-degree opening and closing action of the semi-circular sealing plate 8.

[0045] As a technical optimization of this utility model, the sealing block 4 has a conical structure.

[0046] In this embodiment, the sealing block 4 has a conical structure, which reduces the insertion resistance.

[0047] As a technical optimization of this utility model, handles are fixedly connected to both the left and right ends of the horizontal plate 1.

[0048] In this embodiment: the operator holds the handles with both hands to apply downward pressure to insert into the coal powder layer and pull upward to pull out the device.

[0049] The working principle and usage process of this utility model: When the sampling device is not in use, the arc surface of the semi-circular sealing plate 8 is completely in contact with the inner wall of the sampling cylinder 2, completely sealing the inlet groove 3 to prevent external coal powder or debris from entering the sampling cylinder 2. At this time, the sealing block 4 is threadedly connected to the lower outer wall of the sampling cylinder 2 through the internal threaded cylinder 5, and a closed sampling space is formed between the sealing block 4 and the connecting plate 7.

[0050] According to the particle size detection requirements of a certain depth stratification in the coal powder silo, the operator needs to rotate the torsion block at the right end of the screw 20 to make the screw 20 rotate, which will drive the clamping block 19 to move to the right, release the clamping state between the left end arc surface of the clamping block 19 and the outer wall of the sampling cylinder 2, and then move the positioning plate 17 up and down so that the bottom plane of the positioning plate 17 is aligned with the target scale line 16 in the scale groove 15. The value of the scale line 16 directly corresponds to the vertical distance from the center of the sample inlet groove 3 to the bottom of the positioning plate 17. Then rotate the screw 20 in the opposite direction to push the clamping block 19 to move to the left, and use the anti-slip layer of the arc surface of the inner wall of the U-shaped groove 18 and the left end arc surface of the clamping block 19 to clamp the sampling cylinder 2, ensuring that the position of the positioning plate 17 is fixed and avoiding depth deviation during the sampling process.

[0051] The operator then holds the handles at both ends of the horizontal plate 1 and inserts the sampling cylinder 2 vertically into the static coal powder layer. The conical structure design of the sealing block 4 reduces the insertion resistance. When the bottom end of the positioning plate 17 is in complete contact with the upper surface of the coal powder layer, the insertion is stopped. At this time, the center position of the sampling groove 3 corresponds exactly to the target depth marked on the scale line 16, ensuring accurate sampling position. In this way, the sampling depth can be displayed and controlled intuitively, avoiding reliance on manual experience to estimate the insertion length and significantly improving the reliability of the sampling process.

[0052] Then, a signal is sent to the stepper motor 12 via the manual controller 14. The output shaft of the stepper motor 12 drives the rotating shaft 6 to rotate 180 degrees clockwise. The connecting plate 7 and the semi-circular sealing plate 8 rotate synchronously, so that the sample inlet 3 is fully exposed. At this time, the semi-circular sealing plate 8 rotates to the right side of the sampling cylinder 2 and no longer blocks the sample inlet 3. Then, the operator slightly rotates the horizontal plate 1 back and forth, using the shaking of the sampling cylinder 2 to disturb the coal powder, so that the coal powder at the target depth falls into the sampling cylinder 2 through the sample inlet 3 and accumulates in the space below the connecting plate 7. The bottom surface of the connecting plate 7 is in contact with the inner wall of the sampling cylinder 2, which can prevent the coal powder from leaking upward to the area of ​​the rotating shaft 6.

[0053] After sampling is completed, the stepper motor 12 is rotated 180 degrees in the opposite direction by the manual controller 14, so that the semi-circular sealing plate 8 is reset to the initial position and completely covers the sample inlet 3 again. This step ensures that a closed space is formed inside the sampling cylinder 2 to prevent coal powder from leaking out of the sample inlet 3 during the extraction process. Then, the device is vertically removed from the coal powder layer by the handle of the horizontal plate 1. The stepper motor 12 is driven by a worm gear, and the self-locking characteristic of the worm gear drive is used to prevent the semi-circular sealing plate 8 from shifting position.

[0054] Then, rotate the sealing block 4 and the internal threaded cylinder 5. The sealing block 4 is removed through the threaded connection between the internal threaded cylinder 5 and the sampling cylinder 2. The lower opening of the sampling cylinder 2 is opened, and the coal powder falls directly into the detection container under the action of gravity. Combined with the above working method, the coal powder layer at the target depth can be sampled according to the detection requirements, effectively reducing the sampling deviation caused by gravity stratification.

[0055] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A coal powder sampling device for detecting the fineness of coal powder, comprising a horizontal plate (1), characterized in that: The upper end of the horizontal plate (1) is fixedly connected to a sampling cylinder (2) with openings on both the upper and lower sides. A sampling groove (3) is opened through the left side of the outer wall of the sampling cylinder (2). A fixed frame (10) is fixedly connected to the upper end of the horizontal plate (1). A fixed plate (11) is fixedly connected inside the fixed frame (10). A stepper motor (12) is installed on the upper end of the fixed plate (11). The output end of the stepper motor (12) passes through the fixed plate (11) and is fixedly connected to a rotating shaft (6) located inside the sampling cylinder (2). A connecting plate (7) that fits against the inner wall of the sampling cylinder (2) is fixedly connected to the lower end of the rotating shaft (6). A semi-circular sealing plate (8) that fits against the inner wall of the sampling cylinder (2) is fixedly connected to the lower end of the connecting plate (7). The sampling tube (2) has a scale groove (15) on the right side of its outer wall, and scale lines (16) are provided inside the scale groove (15). A positioning plate (17) is provided below the horizontal plate (1), and a locking mechanism is provided between the positioning plate (17) and the sampling tube (2). The lower end of the sampling tube (2) is provided with a sealing block (4).

2. The coal powder sampling device for detecting the fineness of coal powder according to claim 1, characterized in that: The locking mechanism includes a U-shaped groove (18) that runs through the upper end of the positioning plate (17). Inside the U-shaped groove (18), a pressing block (19) is slidably connected via two sliding grooves and two sliding blocks. The right end of the pressing block (19) is rotatably connected to a screw (20) that runs through the positioning plate (17) and is threadedly connected to the positioning plate (17). The right end of the screw (20) is fixedly connected to a torsion block. The arc-shaped surface of the inner wall of the U-shaped groove (18) and the arc-shaped surface of the left end of the pressing block (19) are both covered with an anti-slip layer.

3. A coal powder sampling device for detecting the fineness of coal powder according to claim 1, characterized in that: Multiple bearings (9) are fixedly connected between the outer wall of the rotating shaft (6) and the inner wall of the sampling cylinder (2).

4. A coal powder sampling device for detecting coal powder fineness according to claim 1, characterized in that: The upper end of the sealing block (4) is fixedly connected to an internally threaded cylinder (5) that is threaded to the outer wall of the sampling cylinder (2).

5. A coal powder sampling device for detecting the fineness of coal powder according to claim 1, characterized in that: The fixed frame (10) is internally fixedly connected to a partition, and a battery (13) electrically connected to the stepper motor (12) is installed at the upper end of the partition. A manual controller (14) electrically connected to the stepper motor (12) is installed at the right end of the fixed frame (10).

6. A coal powder sampling device for detecting the fineness of coal powder according to claim 1, characterized in that: The sealing block (4) has a conical structure.

7. A coal powder sampling device for detecting the fineness of coal powder according to claim 1, characterized in that: Handles are fixedly connected to both the left and right ends of the horizontal plate (1).

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