A dust-free sampling device for raw coal and pulverized coal.

Abstract

This utility model discloses a dust-free sampling device for raw coal and coal powder, relating to the field of coal sampling technology. The device includes a tank with an open top, a sampling pipe connected to a coal powder pipeline on one side of the tank, and an exhaust pipe equipped with a fan and filter screen on the opposite side. The upper end of the tank is covered with a cover plate with a handle, and the lower end is connected to a sampling funnel equipped with a sampling valve. Its innovation lies in the fact that two sets of filter components are suspended from the lower end of the cover plate via hooks. The mesh sizes of the two filter components are different; the mesh on the side closer to the sampling pipe has larger mesh sizes to buffer and filter raw coal, while the mesh on the other side has smaller mesh sizes to filter coal powder. A diamond-shaped counterweight is suspended below the mesh to maintain its vertical deployment. This utility model effectively buffers the impact of large pieces of raw coal through a double-suspended filter screen, significantly reducing dust generation during sampling. Combined with a guide plate and sealing structure, it achieves safe, accurate, and dust-free sampling in high-pressure, high-dust environments.

Description

Technical Field

[0001] This utility model relates to the field of coal sampling technology, specifically a dust-free sampling device for raw coal and coal powder. Background Technology

[0002] Accurate sampling of raw coal and pulverized coal is a crucial step in the production, processing, and utilization of coal. Sampling devices, through accurate sampling and analysis, can determine key indicators of coal such as calorific value, ash content, sulfur content, and moisture content, thus providing a basis for reasonable coal pricing and the design and operational adjustment of combustion equipment.

[0003] A utility model patent with publication number CN219104470U discloses a coal powder sampling device, including a hollow sampling tank with a sampling tube extending through the top of the tank; a sampling hopper connected to the bottom of the tank, with a coal powder discharge valve at the bottom of the hopper; an exhaust port on one side of the tank, with an exhaust pipe on the exhaust port and a filter screen at the outlet end of the exhaust pipe; and a settling ring protruding from the inner wall of the tank, located below the exhaust port, with the inner diameter of the settling ring gradually decreasing downwards.

[0004] While existing technologies transport gas mixed with pulverized coal through a sampling pipe to a sampling container, and filter out the pulverized coal in the gas using a filter screen, collecting the remaining pulverized coal in the sampling container for sampling, in most coal production and transportation scenarios, the pulverized coal pipeline often contains not only pulverized coal but also a certain proportion of raw coal. Raw coal is large and hard, and the impact force with the equipment during sampling easily generates dust. Furthermore, the equipment needs to be extremely wear-resistant and robust to withstand the impact of large pieces of coal, making sampling unsafe and generating a large amount of dust in the sampling container. This cannot meet the requirements for safe and accurate sampling of raw coal and pulverized coal in actual production. Therefore, a dust-free sampling device for raw coal and pulverized coal is proposed. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a dust-free sampling device for raw coal and coal powder. It has the advantages of effectively filtering raw coal and coal powder and reducing dust generation. It solves the problem that existing coal powder sampling devices are unsafe when sampling from coal powder pipelines containing raw coal due to the large size, high hardness, and high impact force of the raw coal, resulting in a large amount of dust generated in the sampling tank. This makes it impossible to meet the actual production requirements for safe and accurate sampling of raw coal and coal powder.

[0006] (II) Technical Solution To achieve the above-mentioned objectives of effectively filtering raw coal and coal dust and reducing dust generation, this utility model provides the following technical solution: A dust-free sampling device for raw coal and pulverized coal includes a tank with an open top. A sampling pipe for communication with a pulverized coal pipeline is connected to one side of the tank, and an exhaust pipe is connected to the opposite side. A fan is installed on the exhaust pipe. A cover plate is provided at the upper end of the tank opening, and a sampling funnel is connected to the lower end of the cover plate. A sampling outlet is provided at the lower end of the sampling funnel, and a sampling valve is provided at the sampling outlet. The lower end of the cover plate is provided with two sets of hooks arranged in a straight line, and a filter assembly is hung on each set of hooks; both filter assemblies include a mesh screen, and the mesh size of the mesh screen of the two filter assemblies is different, wherein the mesh size of the mesh screen of the filter assembly closer to the sampling tube is larger than that of the filter assembly farther away from the sampling tube, so as to filter coal lumps and coal powder respectively; the mesh screen is vertically unfolded and arranged in the tank body.

[0007] The filter assembly further includes a mounting part fixedly disposed at the upper end of the mesh and a counterweight block suspended at the lower end of the mesh; the mounting part is provided with mounting holes for cooperating with the set of hooks, and the counterweight block has a rhomboid cross-section.

[0008] The cover plate has a handle at its upper end, and a sealing ring is provided at the contact surface between the cover plate and the opening of the tank.

[0009] The cover plate is connected to the tank body by a detachable fixing structure, which includes a bolt installed on the top of the tank body and a nut that cooperates with the bolt to tighten and fix the cover plate.

[0010] Inside the tank, below the sampling pipe and the exhaust pipe, there is a guide plate. The guide plate is annular, and the inner ring has a through-hole structure that is larger at the top and smaller at the bottom.

[0011] The exhaust pipe is positioned with its side connected to the tank body at an upward angle, and a filter screen is provided at the upward-extending end of the exhaust pipe.

[0012] The exhaust pipe is equipped with a gas flow meter on one side of the exhaust port to detect the flow rate of the discharged gas.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a dust-free sampling device for raw coal and coal powder, which has the following beneficial effects: This dust-free raw coal and coal powder sampling device uses two sets of suspended filter screens with different mesh sizes. Large pieces of raw coal first impact and are buffered by the first layer of large-pore screen, effectively reducing the impact force and dust. At the same time, the second layer of fine-pore screen further blocks coal powder, allowing the raw coal and coal powder to fall onto the guide plate. The guide plate then guides the raw coal and coal powder to the bottom of the sampling funnel, reducing the dust content in the tank and further ensuring the sampling accuracy of the device in high-pressure, high-dust environments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the appearance and structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the structure of a single filter component in this utility model.

[0015] In the diagram: 1. Tank; 2. Sampling pipe; 3. Exhaust pipe; 4. Sampling funnel; 5. Sampling valve; 6. Exhaust port; 7. Fan; 8. Gas flow meter; 9. Filter screen; 10. Pulverized coal pipeline; 11. Cover plate; 1101. Hook; 12. Handle; 13. Fixing structure; 1301. Bolt; 1302. Nut; 14. Guide plate; 15. Filter assembly; 1501. Mounting part; 1502. Mesh screen; 1503. Counterweight; 16. Sealing ring. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Please see Figure 1 - 4, a dust-free sampling device for raw coal and pulverized coal, comprising a tank 1 with an open top, a sampling pipe 2 connected to one side of the tank 1 for communicating with a pulverized coal pipeline 10, an exhaust pipe 3 connected to the opposite side, and a fan 7 installed on the exhaust pipe 3; a cover plate 11 is provided on the upper end of the opening of the tank 1, and a sampling funnel 4 is connected to the lower end of the funnel 4, and a sampling outlet is provided at the lower end of the sampling outlet, and a sampling valve 5 is provided at the sampling outlet. Tank 1, as the main structure of the entire sampling device, provides space for the sampling of raw coal and pulverized coal. Sampling pipe 2 connects to pulverized coal pipeline 10, serving as the key channel for raw coal and pulverized coal to enter tank 1. Exhaust pipe 3, in conjunction with fan 7, is used to expel gas from tank 1, maintaining a suitable gas pressure environment within tank 1 and ensuring smooth sampling. The design of sampling funnel 4 and sampling valve 5 facilitates the removal of collected raw coal and pulverized coal for analysis after sampling.

[0018] The lower end of the cover plate 11 is provided with two sets of hooks 1101 arranged in a straight line. Each set of hooks 1101 is equipped with a filter assembly 15. Both filter assemblies 15 include a mesh 1502, and the mesh size of the mesh 1502 of the two filter assemblies 15 is different. The mesh size of the mesh 1502 of the filter assembly 15 closer to the sampling tube 2 is larger than that of the filter assembly 15 further away from the sampling tube 2, so as to filter coal lumps and coal powder respectively. The mesh 1502 is vertically unfolded and installed inside the tank 1.

[0019] It should be noted that the two sets of hooks 1101 arranged in a straight line provide a stable suspension position for the filter assembly 15, ensuring that the filter assembly 15 can be accurately installed inside the tank 1. The different mesh sizes of the two filter assemblies 15 mesh 1502 are a targeted design based on the differences in particle size between raw coal and coal powder. The large-pore mesh 1502 is closer to the sampling tube 2, which can initially intercept and buffer large pieces of raw coal to prevent them from directly impacting the inside of the tank 1 and causing equipment damage and a large amount of dust; the fine-pore mesh 1502 further filters coal powder, improving the purity of the sample. The vertically unfolded mesh 1502 can maximize the filtration area and enhance the filtration effect. At the same time, the suspended filter assembly 15 can also effectively buffer and collect raw coal, reducing the generation of coal dust.

[0020] It should be further explained that the two sides of the mesh 1502 do not contact the inner wall of the tank 1 and a certain gap is maintained. Since the flow rates of air and particles are different, the raw coal and coal powder buffered by the filter component 15 are always the majority. Compared with the existing technology, it can effectively reduce the flow rate of coal powder and raw coal in the tank 1, speed up the collection and falling speed, and thus reduce the dust content.

[0021] In this embodiment, the filter assembly 15 further includes a mounting part 1501 fixedly disposed on the upper end of the mesh 1502, and a counterweight 1503 suspended on the lower end of the mesh 1502; the mounting part 1501 is provided with mounting holes for cooperating with a set of hooks 1101, and the counterweight 1503 has a rhomboid cross-section.

[0022] It should be noted that the mounting part 1501, through the mounting hole and the hook 1101, realizes the suspension connection between the filter assembly 15 and the cover plate 11, which facilitates the installation and disassembly of the filter assembly 15 and makes subsequent cleaning and maintenance easier. The counterweight 1503 is suspended at the lower end of the mesh 1502, which allows the mesh 1502 to remain vertically unfolded in the tank 1, preventing the mesh 1502 from shaking or twisting under the impact of airflow or raw coal, thus affecting the filtration effect. The diamond-shaped cross-section design makes it easy for raw coal and coal powder on the counterweight 1503 to fall off.

[0023] In this embodiment, a handle 12 is provided at the upper end of the cover plate 11, and a sealing ring 16 is provided at the closing contact surface between the cover plate 11 and the opening of the tank body 1.

[0024] It should be noted that the handle 12 provided at the upper end of the cover plate 11 provides operators with a convenient way to open and close the cover plate 11, and to install, disassemble, and clean the inside of the tank 1. The sealing ring 16 is located at the contact surface between the cover plate 11 and the opening of the tank 1, which can effectively prevent gas leakage from the tank 1 and external dust from entering the tank 1, ensuring the airtightness of the tank 1, maintaining a stable air pressure environment inside the tank 1, and avoiding interference from external impurities with the sampling results, thereby improving the accuracy and reliability of the sampling.

[0025] In this embodiment, the cover plate 11 is connected to the tank body 1 by a detachable fixing structure 13. The fixing structure 13 includes a bolt 1301 installed on the top of the tank body 1 and a nut 1302 that cooperates with the bolt 1301 to press and fix the cover plate 11.

[0026] It should be noted that the detachable fixing structure 13, composed of bolts 1301 and nuts 1302, ensures a firm connection between the cover plate 11 and the tank body 1. This prevents loosening during sampling due to pressure changes within the tank body 1 or impact from raw coal, thus guaranteeing the sealing and stability of the tank body 1. Furthermore, this detachable design allows for easy opening of the cover plate 11 when needed, facilitating inspection, cleaning, and maintenance of the tank body 1, thereby improving the maintainability and service life of the device.

[0027] In this embodiment, a guide plate 14 is also provided inside the tank body 1 below the sampling pipe 2 and the exhaust pipe 3. The guide plate 14 is annular, and the inner ring is a through hole structure with a larger upper part and a smaller lower part.

[0028] It should be noted that the guide plate 14 is located below the sampling pipe 2 and the exhaust pipe 3. Its annular structure guides the raw coal and coal powder entering the tank 1 from the sampling pipe 2, as well as the gas discharged from the exhaust pipe 3, to flow reasonably within the tank 1. The through-hole structure, which is larger at the top and smaller at the bottom, allows the raw coal and coal powder to pass smoothly through the guide plate 14 under gravity and slide down the inclined surface of the guide plate 14 to the bottom of the sampling funnel 4. This prevents the raw coal and coal powder from accumulating or scattering within the tank 1, further reducing the dust content within the tank 1 and improving sampling efficiency.

[0029] In this embodiment, the side of the exhaust pipe 3 connected to the tank 1 is set to be inclined upward, and a filter screen 9 is also provided at the end of the exhaust pipe 3 that extends inclined upward.

[0030] It should be noted that the side of the exhaust pipe 3 connected to the tank 1 is designed to be inclined upwards. This prevents the raw coal and coal dust inside the tank 1 from directly entering the exhaust pipe 3 under the influence of gravity, thus avoiding blockage of the exhaust pipe 3 and affecting the normal operation of the blower 7. The filter screen 9, installed at the inclined upward extension end, can further filter the coal dust in the exhaust gas, preventing coal dust from being discharged into the external environment with the gas, causing environmental pollution and resource waste, while ensuring the cleanliness of the exhaust gas.

[0031] In this embodiment, a gas flow meter 8 is also provided on the side of the exhaust port 6 on the exhaust pipe 3 to detect the flow rate of the discharged gas.

[0032] It should be noted that the gas flow meter 8 is configured to monitor the flow rate of gas discharged from the exhaust pipe 3 in real time. Operators can use the readings from the gas flow meter 8 to understand the pressure changes within the tank 1, thereby adjusting the operating parameters of the blower 7 to ensure a suitable pressure environment within the tank 1, guaranteeing the stability and accuracy of the sampling process. Simultaneously, the data from the gas flow meter 8 can also provide a reference for subsequent analysis of the airflow during the sampling process.

[0033] In summary, this dust-free raw coal and coal powder sampling device, by setting up two sets of suspended filter screens 1502 with different mesh sizes, allows large pieces of raw coal to first impact and be buffered by the first layer of large-pore screen 1502, effectively reducing the impact force and dust emission. At the same time, the second layer of fine-pore screen 1502 further blocks coal powder, allowing the raw coal and coal powder to fall onto the guide plate 14. The guide plate 14 guides the raw coal and coal powder to the bottom of the sampling funnel 4, reducing the dust content in the tank 1 and further ensuring the sampling accuracy of the device in high-pressure, high-dust environments.

[0034] Working Principle: During sampling, the blower 7 is activated, creating negative pressure inside the tank 1. The mixture of raw coal and pulverized coal enters the tank 1 through the sampling pipe 2. Large pieces of raw coal first impact the first layer of large-pore mesh 1502. The impact is reduced by the buffering effect of the mesh 1502, decreasing the degree of dust dispersion. Simultaneously, pulverized coal and small pieces of raw coal pass through the first layer of mesh 1502 and are further blocked by the second layer of fine-pore mesh 1502. Under gravity, the raw coal and pulverized coal slide down the guide plate 14 to the bottom of the sampling funnel 4. The exhaust pipe 3 discharges the gas from the tank 1, and the gas flow meter 8 monitors the discharge gas flow rate in real time. Operators can adjust the parameters of the blower 7 according to the flow rate. After sampling, the sampling valve 5 is opened, and the collected raw coal and pulverized coal are taken out for analysis. The entire sampling process is conducted in a sealed environment, reducing dust leakage and ensuring the accuracy and safety of the sampling.

[0035] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A dust-free sampling device for raw coal and pulverized coal, comprising a tank with an open top, characterized in that: A sampling pipe for connecting to a pulverized coal pipeline is connected to one side of the tank body, and an exhaust pipe is connected to the opposite side. A fan is installed on the exhaust pipe. A cover plate is provided at the upper end of the tank body opening, and a sampling funnel is connected to the lower end of the cover plate. A sampling outlet is provided at the lower end of the sampling funnel, and a sampling valve is provided at the sampling outlet. The lower end of the cover plate is provided with two sets of hooks arranged in a straight line, and a filter assembly is hung on each set of hooks; both filter assemblies include a mesh screen, and the mesh size of the mesh screen of the two filter assemblies is different, wherein the mesh size of the mesh screen of the filter assembly closer to the sampling tube is larger than that of the filter assembly farther away from the sampling tube, so as to filter coal lumps and coal powder respectively; the mesh screen is vertically unfolded and arranged in the tank body.

2. The dust-free raw coal and pulverized coal sampling device according to claim 1, characterized in that: The filter assembly further includes a mounting part fixedly disposed at the upper end of the mesh and a counterweight block suspended at the lower end of the mesh; the mounting part is provided with mounting holes for cooperating with the set of hooks, and the counterweight block has a rhomboid cross-section.

3. The dust-free raw coal and pulverized coal sampling device according to claim 1, characterized in that: The cover plate is provided with a handle at its upper end, and a sealing ring is provided at the contact surface between the cover plate and the opening of the tank.

4. The dust-free raw coal and pulverized coal sampling device according to claim 1, characterized in that: The cover plate is connected to the tank body by a detachable fixing structure, which includes a bolt installed on the top of the tank body and a nut that cooperates with the bolt to tighten and fix the cover plate.

5. The dust-free sampling device for raw coal and pulverized coal according to claim 1, characterized in that: Inside the tank, below the sampling pipe and the exhaust pipe, there is a guide plate. The guide plate is annular, and the inner ring has a through-hole structure that is larger at the top and smaller at the bottom.

6. The dust-free sampling device for raw coal and pulverized coal according to claim 1, characterized in that: The side of the exhaust pipe connected to the tank is set to an upward angle, and a filter screen is also provided at the end of the exhaust pipe extending upward.

7. The dust-free raw coal and pulverized coal sampling device according to claim 1, characterized in that: A gas flow meter is also installed on one side of the exhaust pipe near the exhaust port to detect the flow rate of the discharged gas.

Images