Pulverized coal fineness online screening and measuring device

Abstract

The invention discloses a pulverized coal fineness on-line screening and measuring device which is characterized in that a fixing plate is fixedly connected to the top end of a bottom plate, the upper end of the fixing plate is fixedly connected with a screening box and a cyclone separator, the bottom end of the cyclone separator is fixedly connected with a powder falling pipe, a screen is arranged in the screening box, and the bottom end of the screen is fixedly connected with the cyclone separator. The top end of the screening box is fixedly connected with a sampling pipe, the bottom end of the screening box is fixedly connected with an air inlet pipe, an upper guide pipe is fixedly connected between the cyclone separator and the screening box, and the bottom end of the upper guide pipe is communicated with the bottom end of the screening box through a lower guide pipe; the negative pressure air extractor is fixedly connected to the top end of the bottom plate, the negative pressure air extractor is communicated with the top end of the cyclone separator, and the top end of the negative pressure air extractor is communicated with the powder falling pipe through a recycling pipe and a powder discharging pipe; the sealing assembly is assembled on the powder falling pipe, the sealing assembly is used for achieving clamping sealing of the powder falling pipe and the inner wall of the electronic balance, and the device is excellent in sealing performance and easy to replace.

Description

Technical Field

[0001] This invention belongs to the field of coal powder fineness measurement technology, and relates to an online coal powder fineness screening and measurement device. Background Technology

[0002] In industrial production processes that use pulverized coal as fuel or raw material, such as coal-fired power generation, metallurgical sintering, and cement calcination, the fineness of pulverized coal is a key parameter affecting combustion efficiency, pollutant emissions, and safe operation of equipment. Therefore, corresponding online screening and measurement devices are needed to achieve automated screening production.

[0003] Chinese patent discloses an online coal powder fineness sieving and measuring device, publication number CN214374101U, comprising a negative pressure air extractor, a sieving mechanism, a cyclone separator, an electronic balance, a sample cup, a lifting mechanism, and a controller. The negative pressure air extractor's intake port is connected to the cyclone separator's air inlet, and its outlet port is connected to the coal powder pipeline via a return valve. The control port of the negative pressure air extractor is connected to the compressed air end via an air extraction solenoid valve. The sieving mechanism includes an upper cover, a sample sieve, a base, a powder discharge mechanism, and a powder blowing mechanism. The upper cover and base are sealed together, the sample sieve is sealed between the upper cover and the base, the powder discharge mechanism is mounted on the upper cover, and the powder blowing mechanism is mounted on the base, with the powder blowing mechanism connected to the air inlet. The upper cover has a through-type feed pipe connected to the coal powder pipeline via a sampling valve. The base has a through-type feed pipe... The system includes a lower powder discharge pipe, which is connected to the first port of a tee via a lower valve. The powder discharge mechanism is connected to the second port of the tee, and the third port of the tee is connected to the separator inlet of a cyclone separator via a pipe. The discharge port at the bottom of the cyclone separator is connected to the powder discharge pipe. A vibrator is installed on the outside of the powder discharge pipe, and the control end of the vibrator is connected to the compressed air end via a vibration solenoid valve. A sample cup is located below the powder discharge pipe and is placed on a cup holder. The inner diameter of the cup holder is larger than the outer diameter of the sample cup body but smaller than the outer diameter of the sample cup rim. The cup holder is fixed on a lifting mechanism and moves vertically up and down with the lifting mechanism. An electronic balance is located directly below the sample cup. The controller is connected to the electronic balance, the powder return valve, the air extraction solenoid valve, the sampling valve, the lower valve, and the vibration solenoid valve. The controller is a programmable electronic measurement and control system. The online coal powder fineness measurement device of this invention can obtain the coal powder fineness value online in a timely manner, providing effective feedback information for the closed-loop optimization control of the coal mill pulverizing system. Moreover, the measurement accuracy is not affected by factors such as coal type, particle roundness, and transmittance. The measurement does not require calibration, has high accuracy and good repeatability, and can also be applied to the online measurement of powder particle fineness in other industrial production processes, with a wide range of applications.

[0004] In the above scheme, the sample cup is sealed to the powder discharge tube by a sealing gasket during the up and down movement. However, long-term use will reduce the sealing ability of the sealing gasket. The above scheme is cumbersome and inconvenient to disassemble and assemble the sealing gasket, which is not conducive to timely replacement by the staff, resulting in inconvenience in use. Therefore, it is necessary to design an online coal powder fineness screening and measuring device. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an online coal powder fineness screening and measuring device with excellent sealing performance and easy replacement.

[0006] To achieve the above objectives, the present invention discloses an online sieving and measuring device for coal powder fineness, characterized in that it comprises:

[0007] Base plate;

[0008] A controller and an electronic balance are fixedly connected to the top of the base plate, and a sample cup is provided at the top of the electronic balance;

[0009] A lifting assembly is mounted on the top of the base plate, which is used to enable the sample cup to slide up and down;

[0010] A fixed plate is fixedly connected to the top of the base plate. A screening box and a cyclone separator are fixedly connected to the upper end of the fixed plate. A powder drop pipe is fixedly connected to the bottom end of the cyclone separator. A screen is installed inside the screening box. A sampling pipe is fixedly connected to the top end of the screening box. An air inlet pipe is fixedly connected to the bottom end of the screening box. An upper guide pipe is fixedly connected between the cyclone separator and the screening box. The bottom end of the upper guide pipe is connected to the bottom end of the screening box through a lower guide pipe.

[0011] A negative pressure air extractor is fixedly connected to the top of the base plate. The negative pressure air extractor is connected to the top of the cyclone separator. The top of the negative pressure air extractor is connected to the powder discharge pipe through a recovery pipe and a powder discharge pipe.

[0012] A sealing assembly is fitted onto the powder discharge tube, the sealing assembly being used to achieve a locking seal between the powder discharge tube and the inner wall of the electronic balance.

[0013] A further improvement of the online coal powder fineness screening and measuring device of the present invention is as follows:

[0014] Furthermore, the sealing assembly includes:

[0015] A sealing sleeve is fitted onto the lower end of the powder discharge tube, and a sealing ring is fixedly connected to the lower end of the sealing sleeve.

[0016] A fixing block is symmetrically fixedly connected to both sides of the top of the sealing sleeve, and a fixing bolt that penetrates the fixing block is movably connected to one side of the fixing block;

[0017] Bolt holes are symmetrically opened on both sides of the lower end of the powder discharge pipe, and the bolt holes and the fixing bolts form a threaded fit structure.

[0018] Furthermore, the lower end of the surface of the sealing ring is beveled.

[0019] Furthermore, the cross-sectional area of ​​the top of the sealing sleeve is larger than the cross-sectional area of ​​the sample cup.

[0020] Furthermore, a locking block is fixedly connected to the lower end of the inner wall of the sealing sleeve, and locking grooves that engage with the inside of the locking block are opened on both sides of the bottom end of the powder discharge tube.

[0021] Furthermore, the inner wall of the fixing block is in contact with the surface of the powder discharge tube.

[0022] Furthermore, the lifting assembly includes:

[0023] A lifting seat is fixedly connected to one side of the top of the base plate. The side wall of the lifting seat is provided with a fixing groove. A threaded rod is rotatably connected to the inner wall of the fixing groove. A threaded plate is threadedly connected to the surface of the threaded rod. A sliding switch is fixedly connected to the end of the threaded plate.

[0024] A servo motor is fixedly connected to the top of the lifting seat, and the output end of the servo motor is fixedly connected to the top of the threaded rod through a coupling;

[0025] A sliding groove is formed at equal intervals along the circumference on the surface of the sample cup. A sliding rod is fixedly connected to the inner wall of the sliding groove, and a slider is movably connected to the surface of the sliding rod. The slider is fixedly connected to the inner wall of the sliding groove.

[0026] Furthermore, a sliding groove is provided on one side of the lifting seat at both ends of the fixed groove, and a sliding plate that slides and engages with the inside of the sliding groove is fixedly connected to the sliding side.

[0027] Furthermore, a sliding structure is formed between the surfaces of the slider and the slide rod.

[0028] Furthermore, the top of the sealing ring has an O-shaped structure;

[0029] The shape of the card block and the card slot is convex;

[0030] The inner wall of the fixing block has an arc-shaped structure.

[0031] The present invention has the following beneficial effects:

[0032] In specific operation, the online coal powder fineness sieving and measuring device of the present invention includes a sealing component mounted on the powder discharge tube. This sealing component is used to achieve a locking seal between the powder discharge tube and the inner wall of the electronic balance. The sealing component can completely block and seal the top of the powder discharge tube. The sealing ring further improves the sealing performance between the powder discharge tube and the sample cup, achieving a double seal and ensuring its sealing effect. At the same time, the locking block engages with the inside of the locking groove, and the fixing bolt engages with the threaded part inside the bolt hole, enabling the sliding assembly and disassembly of the sealing ring and sealing sleeve with the surface of the powder discharge tube. This facilitates the disassembly and assembly of the severely worn sealing ring, ensuring the tightness of the seal after it is locked with the inside of the sample cup. Attached Figure Description

[0033] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a front view structural diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0036] Figure 3 This is a schematic diagram of the overall partial cross-sectional structure of the present invention;

[0037] Figure 4 This is a partial exploded view of the lifting assembly of the present invention;

[0038] Figure 5 This is an exploded magnified structural diagram of the sealing component of the present invention.

[0039] Among them, 1 is the lower guide tube, 2 is the upper guide tube, 3 is the lifting assembly, 301 is the lifting seat, 302 is the servo motor, 303 is the sliding switch, 304 is the fixed groove, 305 is the sliding groove, 306 is the sliding rod, 307 is the slider, 308 is the sliding groove, 309 is the sliding plate, 310 is the threaded rod, 311 is the threaded plate, 4 is the electronic balance, 5 is the sample cup, 6 is the sealing assembly, 601 is the sealing ring, 602 is the sealing sleeve, 603 is the locking block, 604 is the fixing block, 605 is the fixing bolt, 606 is the locking groove, 607 is the bolt hole, 7 is the powder discharge pipe, 8 is the powder drop pipe, 9 is the cyclone separator, 10 is the recovery pipe, 11 is the negative pressure air extractor, 12 is the sampling pipe, 13 is the screening box, 14 is the air inlet pipe, 15 is the fixing plate, 16 is the controller, and 17 is the base plate. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0044] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0045] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0048] Example 1

[0049] like Figures 1 to 5 As shown, this embodiment discloses an online coal powder fineness sieving and measuring device, including a base plate 17; a controller 16 fixedly connected to one side of the top of the base plate 17, and an electronic balance 4 fixedly connected to the other side of the top of the base plate 17, with a sample cup 5 disposed at the top of the electronic balance 4; a lifting assembly 3 assembled on one side of the top of the base plate 17, the lifting assembly 3 being used to realize the up and down sliding of the sample cup 5; a fixing plate 15 fixedly connected to the top of the base plate 17, with a screening box 13 and a cyclone separator 9 fixedly connected to the upper end of one end of the fixing plate 15, and a powder drop pipe 8 fixedly connected to the bottom end of the cyclone separator 9; a screen is disposed inside the screening box 13, and a sampling device is fixedly connected to one side of the top of the screening box 13. An air inlet pipe 14 is fixedly connected to the bottom of the tube 12 and the screening box 13. An upper guide pipe 2 is fixedly connected between the cyclone separator 9 and the screening box 13. A lower guide pipe 1 is fixedly connected to one side of the bottom of the upper guide pipe 2. One end of the lower guide pipe 1 is connected to one side of the bottom of the screening box 13. A negative pressure air extractor 11 is fixedly connected to one side of the top of the base plate 17. One end of the negative pressure air extractor 11 is connected to the top of the cyclone separator 9 through a guide pipe. A recovery pipe 10 is fixedly connected to one side of the top of the negative pressure air extractor 11. A powder discharge pipe 7 connected to the powder drop pipe 8 is fixedly connected to one end of the recovery pipe 10. A sealing component 6 is assembled on the powder drop pipe 8. The sealing component 6 is used to achieve the locking and sealing between the powder drop pipe 8 and the inner wall of the electronic balance 4.

[0050] It should be noted that some existing online coal powder fineness screening and measuring devices still have certain shortcomings in actual use. The sealing gaskets in the comparison documents are cumbersome to disassemble and install, which makes it difficult for staff to replace them in a timely manner, resulting in inconvenience in their use.

[0051] In a further preferred embodiment of the present invention, the sealing assembly 6 includes: a sealing sleeve 602 fitted onto the lower end of the surface of the powder discharge pipe 8, with a sealing ring 601 fixedly connected to the lower end of the surface of the sealing sleeve 602; fixing blocks 604 symmetrically fixedly connected to both sides of the top of the sealing sleeve 602, with a fixing bolt 605 movably connected to one side of the fixing block 604 and penetrating the fixing block 604; and bolt holes 607 symmetrically opened at the lower ends of both sides of the surface of the powder discharge pipe 8, with the bolt holes 607 and one end of the fixing bolt 605 forming a threaded engagement structure.

[0052] In this embodiment, when the sealing ring 601 is severely worn and affects the sealing performance, the fixing bolt 605 can be rotated with a screwdriver or other tools until it is completely disengaged from the bolt hole 607. Then, the sealing sleeve 602 can be pulled down to completely disengage the locking block 603 from the slot 606, thus disassembling the sealing ring 601 and the sealing sleeve 602. When installing a new one, the sealing sleeve 602 can be placed on the bottom of the powder discharge pipe 8, and the locking block 603 can be locked into the slot 606. Then, the fixing bolt 605 can be tightened into the bolt hole 607 to achieve a secure installation between the sealing sleeve 602 and the powder discharge pipe 8.

[0053] In a further preferred embodiment of the present invention, the lower end of the surface of the sealing ring 601 is inclined, and the top end of the sealing ring 601 is O-shaped.

[0054] In this embodiment, the inclined sealing ring 601 is used to make it easier to engage and seal with the inside of the sample cup 5.

[0055] In a further preferred embodiment of the present invention, the area of ​​the top cross-section of the sealing sleeve 602 is greater than the area of ​​the cross-section of the sample cup 5, and the height of the lower end of the sealing sleeve 602 is equal to the height of the sealing ring 601.

[0056] In this embodiment, a large-area sealing sleeve 602 is used so that after the powder discharge tube 8 is fully raised and locked in place, the top of the powder discharge tube 8 can be completely blocked and sealed by the sealing sleeve 602.

[0057] In a further preferred embodiment of the present invention, a locking block 603 is fixedly connected to the lower end of the inner wall of the sealing sleeve 602, and a locking groove 606 is provided on both sides of the bottom end of the powder discharge tube 8 to engage with the inside of the locking block 603. The locking block 603 and the locking groove 606 are convex in shape.

[0058] In this embodiment, the engagement between the convex locking block 603 and the slot 606 is used to ensure the accuracy and stability of the sealing sleeve 602 and the powder discharge pipe 8.

[0059] In a further preferred embodiment of the present invention, the inner wall of the fixing block 604 is arc-shaped, and the inner wall of the fixing block 604 is in contact with the surface of the powder discharge tube 8.

[0060] Example 2

[0061] Based on Embodiment 1, a preferred embodiment of the online coal powder fineness sieving and measuring device provided by the present invention is as follows: Figures 1 to 5 As shown: The lifting assembly 3 includes: a lifting seat 301 fixedly connected to one side of the top of the base plate 17, a fixing groove 304 is provided at the middle position of one side of the lifting seat 301, a threaded rod 310 is rotatably connected to the inner wall of the fixing groove 304, a threaded plate 311 is threadedly connected to the surface of the threaded rod 310, and a sliding switch 303 is fixedly connected to one end of the threaded plate 311; a servo motor 302 fixedly connected to the top of the lifting seat 301, and the output end of the servo motor 302 is fixedly connected to the top of the threaded rod 310 through a coupling; a sliding groove 308 is opened at equal angles on the surface of the sample cup 5, a sliding rod 306 is fixedly connected to the inner wall of the sliding groove 308, a slider 307 is movably connected to the surface of the sliding rod 306, and one end of the slider 307 is fixedly connected to the inner wall of the sliding switch 303.

[0062] In this embodiment, the empty weight of the sample cup 5 is detected by the electronic balance 4. Then, the servo motor 302 is started to drive the threaded rod 310 to rotate. The threaded engagement between the threaded rod 310 and the threaded plate 311 causes the threaded plate 311 to slide, which in turn causes the sliding switch 303 to slide. This causes the slider 307 to slide on the surface of the sliding rod 306 to the top wall of the groove 308. Consequently, the sample cup 5 rises and engages with the lower end of the powder drop tube 8. After fine or coarse coal powder has been inside the sample cup 5 for a period of time, the servo motor 302 can be used to rotate the threaded rod 310 in the opposite direction, causing the sliding switch 303 to descend to a predetermined height. At this time, the bottom of the sample cup 5 is in contact with the top of the electronic balance 4. The total weight of the sample cup 5 and the coal powder can then be detected and read by the electronic balance 4, thereby calculating the weight of the absorbed or coarse coal powder.

[0063] In a further preferred embodiment of the present invention, a sliding groove 305 is provided on one side of the lifting seat 301 at both ends of the fixed groove 304, and a sliding plate 309 that slides and cooperates with the inside of the sliding groove 305 is fixedly connected to one side of the sliding plate 303.

[0064] In this embodiment, the smoothness of the sliding of the sliding plate 309 and the sliding groove 305 is improved by utilizing the sliding between them.

[0065] In a further preferred embodiment of the present invention, a sliding structure is formed between the surfaces of the slider 307 and the slide bar 306, and four slide bars 306 and sliders 307 are distributed at equal angles.

[0066] In this embodiment, by utilizing the sliding of the slider 307 and the sliding rod 306, the sample cup 5 can slide down naturally under the weight of the inner wall of the sliding switch 303, thereby facilitating the electronic balance 4 to detect the weight of the sample cup 5 and the coal powder.

[0067] In summary, the screening box 13 facilitates the screening of coarse and fine coal powder in the powder tube. At the same time, the electronic balance 4, sample cup 5, and cyclone separator 9 facilitate the detection of the weight of fine or coarse coal powder within a certain period of time. The specific working principle can be found in the background technology of this application. Furthermore, the sealing component 6 can improve the sealing performance between the powder drop tube 8 and the sample cup 5, and can also be used to disassemble and replace the severely worn sealing ring 601.

[0068] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0069] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0070] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An online sieving and measuring device for coal powder fineness, characterized in that, include: Base plate (17); A controller (16) and an electronic balance (4) are fixedly connected to the top of the base plate (17), and a sample cup (5) is provided at the top of the electronic balance (4); The lifting assembly (3) is mounted on the top of the base plate (17), and the lifting assembly (3) is used to realize the up and down sliding of the sample cup (5); A fixing plate (15) is fixedly connected to the top of the base plate (17). A screening box (13) and a cyclone separator (9) are fixedly connected to the upper end of the fixing plate (15). A powder drop pipe (8) is fixedly connected to the bottom end of the cyclone separator (9). A screen is provided inside the screening box (13). A sampling pipe (12) is fixedly connected to the top end of the screening box (13). An air inlet pipe (14) is fixedly connected to the bottom end of the screening box (13). An upper guide pipe (2) is fixedly connected between the cyclone separator (9) and the screening box (13). The bottom end of the upper guide pipe (2) is connected to the bottom end of the screening box (13) through a lower guide pipe (1). A negative pressure air extractor (11) is fixedly connected to the top of the base plate (17). The negative pressure air extractor (11) is connected to the top of the cyclone separator (9). The top of the negative pressure air extractor (11) is connected to the powder discharge pipe (8) through the recovery pipe (10) and the powder discharge pipe (7). A sealing assembly (6) is assembled on the powder discharge tube (8), the sealing assembly (6) being used to achieve a locking seal between the powder discharge tube (8) and the inner wall of the electronic balance (4).

2. The online coal powder fineness screening and measuring device according to claim 1, characterized in that, The sealing assembly (6) includes: A sealing sleeve (602) is fitted onto the lower end of the powder discharge tube (8), and a sealing ring (601) is fixedly connected to the lower end of the sealing sleeve (602); Fixing blocks (604) are symmetrically fixedly connected to both sides of the top end of the sealing sleeve (602), and fixing bolts (605) that penetrate the fixing blocks (604) are movably connected to one side of the fixing blocks (604); Bolt holes (607) are symmetrically opened on both sides of the lower end of the powder discharge pipe (8), and the bolt holes (607) and the fixing bolts (605) form a threaded fit structure.

3. The online coal powder fineness screening and measuring device according to claim 2, characterized in that, The lower end of the surface of the sealing ring (601) is inclined.

4. The online coal powder fineness screening and measuring device according to claim 2, characterized in that, The cross-sectional area of ​​the top of the sealing sleeve (602) is greater than the cross-sectional area of ​​the sample cup (5).

5. The online coal powder fineness screening and measuring device according to claim 2, characterized in that, The lower end of the inner wall of the sealing sleeve (602) is fixedly connected to a locking block (603), and the two sides of the bottom end of the powder discharge tube (8) are provided with locking grooves (606) that engage with the inside of the locking block (603).

6. The online coal powder fineness screening and measuring device according to claim 2, characterized in that, The inner wall of the fixing block (604) is in contact with the surface of the powder drop tube (8).

7. The online coal powder fineness screening and measuring device according to claim 1, characterized in that, The lifting assembly (3) includes: A lifting seat (301) is fixedly connected to one side of the top of the base plate (17). The side wall of the lifting seat (301) is provided with a fixing groove (304). The inner wall of the fixing groove (304) is rotatably connected with a threaded rod (310). The surface of the threaded rod (310) is threadedly connected with a threaded plate (311). The end of the threaded plate (311) is fixedly connected with a sliding switch (303). A servo motor (302) is fixedly connected to the top of the lifting seat (301), and the output end of the servo motor (302) is fixedly connected to the top of the threaded rod (310) through a coupling; A groove (308) is equally spaced along the circumference on the surface of the sample cup (5). A slide rod (306) is fixedly connected to the inner wall of the groove (308). A slider (307) is movably connected to the surface of the slide rod (306). The slider (307) is fixedly connected to the inner wall of the sliding switch (303).

8. The online coal powder fineness screening and measuring device according to claim 7, characterized in that, The lifting seats (301) at both ends of the fixed groove (304) are provided with sliding grooves (305) on one side, and a sliding plate (309) that slides and cooperates with the inside of the sliding groove (305) is fixedly connected to one side of the sliding switch (303).

9. The online coal powder fineness screening and measuring device according to claim 7, characterized in that, The surfaces of the slider (307) and the slide bar (306) form a sliding structure.

10. The online coal powder fineness screening and measuring device according to claim 2, characterized in that, The top of the sealing ring (601) has an O-shaped structure; The shape of the card block (603) and the card slot (606) is convex; The inner wall of the fixing block (604) has an arc-shaped structure.

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