A screening device for coal testing in a thermal power plant

Abstract

The utility model relates to the technical field of screening equipment discloses a kind of screening equipment for coal test of thermal power plant, including bottom plate and the screening box of its top surface fixed installation by support rod, the top front end of screening box is fixedly provided with feed hopper, and the lower portion of feed hopper is provided with screen frame, the inside of screening box is movably arranged to screen frame, and the bottom of screen frame is evenly provided with multiple screen holes, the bottom center of screening box is fixedly provided with first discharge channel, and the bottom rear end of screening box is fixedly provided with second discharge channel, the top of screen frame is evenly provided with multiple pipes from front to right, the screening equipment for coal test of thermal power plant can realize the collaborative operation of coal sample screening and drying function, the hot air stream of injection can not only carry out quick drying to humid coal sample, avoid coal particle adhesion, while auxiliary coal particle dispersion, further improve screening efficiency and screening effect, and practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment technology, specifically a screening device for coal testing in thermal power plants. Background Technology

[0002] In the production and operation of thermal power plants, coal is the core energy source, and its quality directly determines boiler combustion efficiency, power generation costs, and pollutant emission levels. Coal testing, as a key link in controlling coal quality, provides accurate data support for coal procurement, blending, and boiler operating parameter optimization in thermal power plants. Coal sample screening is an indispensable preliminary step in the coal testing process. By separating coal samples according to different particle size grades through screening equipment, impurities can be effectively removed, ensuring the representativeness and uniformity of coal samples used in subsequent tests, thereby ensuring the accuracy of test results. This is of great significance for the safe, efficient, and economical operation of thermal power plants. However, existing screening equipment still has certain shortcomings, such as: The "Coal Powder Screening Device for Thermal Power Plants" with application number CN201920662138.6 does not have the function of heating and drying. Because coal easily absorbs moisture from the air during storage and transportation, wet coal samples are prone to particle agglomeration during screening. Agglomerated coal samples not only block the screen holes, resulting in a significant decrease in screening efficiency, but also cause coal samples of different particle sizes to stick together, making it impossible to achieve effective separation, ultimately affecting the accuracy of subsequent test data. In view of this, and in response to the above problems, we conducted in-depth research and proposed a screening device for coal testing in thermal power plants to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a screening device for coal testing in thermal power plants, in order to solve the problem mentioned in the background art that existing screening devices cannot dry coal samples, which easily causes agglomeration and makes effective screening difficult.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a screening device for coal testing in thermal power plants, comprising a bottom plate and a screening box fixedly installed on its top surface by a support rod; The top front end of the screening box is fixedly provided with a feed hopper, and a screen frame is provided below the feed hopper. The screen frame is movably provided inside the screening box, and multiple screen holes are evenly provided at the bottom of the screen frame. A first discharge channel is provided through the center of the bottom of the screening box, and a second discharge channel is fixedly provided through the rear end of the bottom of the screening box. Multiple through pipes are evenly provided above the screen frame from front to right, and multiple air jets are evenly provided at the bottom of the through pipes. The front side wall of the screening box is provided with a drive mechanism for the reciprocating movement of the screen frame, and the front end of the drive mechanism is provided with a power mechanism. The right side of the screening box is provided with an air supply mechanism, and the air supply mechanism is connected to the drive mechanism through a transmission mechanism.

[0005] The above technical solution facilitates heating and drying during the coal sample screening process, thus solving the problem of caking in damp coal samples.

[0006] As a preferred technical solution of this utility model, the front and rear ends of the left and right side walls of the screen frame are fixedly installed with sliding plates, and the sliding plates slide through the side walls of the screening box.

[0007] The above technical solution facilitates stable guidance for the reciprocating movement of the screen frame.

[0008] As a preferred technical solution of this utility model, the driving mechanism includes a driving rod that passes through the front side wall of the screening box via a bearing, and a turntable is coaxially fixedly installed at the rear end of the driving rod. A driving pin is fixedly installed at an eccentric position on the rear side of the turntable, and a fixed seat is provided on the rear side of the turntable. A strip groove is opened on the front side of the fixed seat, and the driving pin extends into the strip groove. The diameter of the driving pin matches the width of the strip groove.

[0009] By adopting the above technical solution, when the drive rod rotates, the turntable rotates synchronously with the drive rod, and the eccentrically set drive pin slides in the strip groove, which can push the fixed seat to move back and forth in the horizontal direction, thereby driving the screen frame to move back and forth synchronously, improving the screening effect.

[0010] As a preferred embodiment of this utility model, the power mechanism includes a motor, the shaft end of the motor is keyed to the front end of the drive rod, and the motor is fixedly installed on the inner wall of the front side of the housing. The housing is fixedly installed on the front side of the screening box, and the drive rod passes through the rear side wall of the housing through a bearing.

[0011] The above technical solution facilitates the rotation of the drive rod by the motor, thereby improving stable power output.

[0012] As a preferred embodiment of this utility model, the gas conveying mechanism includes a rotating shaft that passes through the rear side wall of the casing via a bearing and is located at the rear of the screening box. A wind duct is fixedly installed on the right side wall of the screening box, and the rear end of the rotating shaft extends into the wind duct. A fan blade is coaxially fixedly installed at the rear end of the rotating shaft. Multiple electric heating wires are provided on the rear side of the fan blades and are fixedly installed on the inner wall of the wind duct. A gas conveying pipe is fixedly connected to the rear end of the wind duct, and the right end of the gas conveying pipe is fixedly connected to the through pipe.

[0013] By adopting the above technical solution, when the rotating shaft drives the fan blades to rotate, airflow is generated inside the air duct. The airflow is heated by the electric heating wire to form a hot airflow, which is then sprayed from the air nozzle onto the coal sample through the air delivery pipe and the through pipe, thus avoiding the sticking of the wet coal sample and resulting in poor screening.

[0014] As a preferred embodiment of the present invention, the transmission mechanism includes a drive pulley, which is fixedly mounted on the surface of the drive rod and located inside the housing. The drive pulley is connected to the driven pulley via a belt, and the driven pulley is coaxially fixedly mounted on the front end of the rotating shaft.

[0015] By adopting the above technical solution, it is convenient for the drive rod to rotate and drive the active pulley to rotate, and the active pulley drives the driven pulley and the shaft to rotate through the belt.

[0016] As a preferred embodiment of the present invention, the transmission mechanism includes a first bevel gear set, which is mounted on the surface of the drive rod and located inside the housing. The right inner wall of the housing is connected to the right end bearing of the transmission rod, and the front end of the transmission rod is fixedly connected to the first bevel gear set. A second bevel gear set is mounted on the surface of the transmission rod and is fixedly connected to the front end of the rotating shaft.

[0017] By adopting the above technical solution, it is convenient for the drive rod to drive the transmission rod to rotate through the first bevel gear set, and the transmission rod to drive the rotating shaft to rotate through the second bevel gear set.

[0018] Compared with the prior art, the beneficial effects of this utility model are: the screening equipment for coal testing in thermal power plants can realize the coordinated operation of coal sample screening and drying functions. The hot air jet can not only quickly dry the wet coal sample and prevent coal particles from sticking together, but also help disperse the coal particles, further improving screening efficiency and screening effect, and is highly practical. 1. The motor can make the drive rod rotate, which makes the turntable drive the drive pin to rotate in a circle. With the cooperation of the drive pin and the strip groove, the fixed seat drives the screen frame to move back and forth in a straight line, so as to achieve efficient screening of coal samples. 2. While the drive rod rotates, it drives the rotating shaft and fan blades to rotate through the transmission mechanism, thereby generating airflow. The airflow is heated by the electric heating wire, and the hot airflow is transported through the air supply pipe and then sprayed onto the coal sample through the air jet nozzle to heat and dry the coal sample. This can effectively reduce coal particle adhesion and improve the screening effect. 3. The electric heating wire, together with the temperature sensor and controller, realizes closed-loop control of hot air temperature to avoid overheating and deterioration of coal samples. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front side view of the present invention; Figure 2This is a schematic diagram of the rear side view of the present invention; Figure 3 This is a schematic diagram of the screening box structure of this utility model; Figure 4 This is a schematic diagram of the connection structure between the drive pin and the slot in this utility model; Figure 5 This is a schematic diagram of the connection structure between the belt and the driving pulley and the driven pulley of this utility model; Figure 6 This is a schematic diagram of the connection structure between the transmission rod and the first and second bevel gear sets in Embodiment 2 of this utility model.

[0020] In the diagram: 1. Base plate; 2. Screening box; 3. Feed hopper; 4. Screen frame; 5. First feeding channel; 6. Second feeding channel; 7. Through pipe; 8. Air nozzle; 9. Slide plate; 10. Drive rod; 11. Turntable; 12. Drive pin; 13. Fixed base; 14. Strip groove; 15. Motor; 16. Chassis; 17. Rotating shaft; 18. Air duct; 19. Fan blade; 20. Electric heating wire; 21. Air supply pipe; 22. Drive pulley; 23. Belt; 24. Driven pulley; 25. First bevel gear set; 26. Transmission rod; 27. Second bevel gear set. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 - Figure 5 The present invention provides a screening device for coal testing in a thermal power plant, comprising a base plate 1 and a screening box 2 fixedly installed on its top surface by a support rod. The screening box 2 is equipped with a controller for controlling various electrical devices. A temperature sensor is installed inside the screening box 2. A feed hopper 3 is fixedly and continuously provided at the front end of the top of the screening box 2, and a screen frame 4 is provided below the feed hopper 3. The screen frame 4 is movably provided inside the screening box 2, and multiple screen holes are evenly and continuously provided at the bottom of the screen frame 4. A first discharge channel 5 is provided through the center of the bottom of the screening box 2, and a second discharge channel 6 is fixedly and continuously provided at the rear end of the bottom of the screening box 2. Discharge valves are provided at the bottom of the first discharge channel 5 and the second discharge channel 6. Multiple through pipes 7 are evenly provided from front to right above the screen frame 4, and multiple air jets 8 are evenly provided at the bottom of the through pipes 7. The front side wall of the screening box 2 is provided with a drive mechanism for the reciprocating movement of the screen frame 4, and the front end of the drive mechanism is provided with a power mechanism. The right side of the screening box 2 is provided with an air supply mechanism, and the air supply mechanism is connected to the drive mechanism through a transmission mechanism.

[0023] Slide plates 9 are fixedly installed at both ends of the left and right side walls of the screen frame 4, and slide plates 9 slide through the side walls of the screening box 2.

[0024] The driving mechanism includes a driving rod 10, which passes through the front side wall of the screening box 2 via a bearing. A turntable 11 is coaxially fixedly mounted on the rear end of the driving rod 10. A driving pin 12 is fixedly mounted on the rear side of the turntable 11 at an eccentric position. A fixed seat 13 is provided on the rear side of the turntable 11. A strip groove 14 is opened on the front side of the fixed seat 13. The driving pin 12 extends into the strip groove 14, and the diameter of the driving pin 12 matches the width of the strip groove 14.

[0025] The power mechanism includes a motor 15, the shaft end of the motor 15 is keyed to the front end of the drive rod 10, and the motor 15 is fixedly installed on the front inner wall of the housing 16. The housing 16 is fixedly installed on the front side of the screening box 2, and the drive rod 10 passes through the rear side wall of the housing 16 through a bearing. Multiple heat dissipation holes are evenly opened on the top of the housing 16.

[0026] The gas delivery mechanism includes a rotating shaft 17, which passes through the rear side wall of the housing 16 via a bearing and is located at the rear of the screening box 2. A duct 18 is fixedly installed on the right side wall of the screening box 2, and the rear end of the rotating shaft 17 extends into the duct 18. A fan blade 19 is coaxially fixedly installed at the rear end of the rotating shaft 17. Multiple electric heating wires 20 are provided on the rear side of the fan blade 19, and the electric heating wires 20 are fixedly installed on the inner wall of the duct 18. A gas delivery pipe 21 is fixedly connected to the rear end of the duct 18, and the gas delivery pipe 21 is fixedly connected to the right end of the connecting pipe 7.

[0027] The transmission mechanism includes a drive pulley 22, which is fixedly mounted on the surface of the drive rod 10 and located inside the housing 16. The drive pulley 22 is connected to the driven pulley 24 via a belt 23, and the driven pulley 24 is coaxially fixedly mounted on the front end of the rotating shaft 17.

[0028] Working principle: When in use, the coal sample to be screened is poured from the feed hopper 3 into the screen frame 4, and the motor 15 and the electric heating wire 20 are started by the controller; Motor 15 drives drive rod 10 to rotate, drive rod 10 drives turntable 11 to rotate, drive pin 12 on turntable 11 slides in the strip groove 14 of fixed seat 13, pushes fixed seat 13 to drive screen frame 4 to reciprocate through slide plate 9, coal sample vibrates and screens in screen frame 4, fine coal sample falls into the bottom of screening box 2 through screen hole and is discharged from first discharge channel 5, coarse coal sample remaining in screen frame 4 is discharged from second discharge channel 6; The drive rod 10 simultaneously drives the active pulley 22 to rotate. The active pulley 22 drives the driven pulley 24 to rotate via the belt 23. The driven pulley 24 drives the rotating shaft 17 and the fan blade 19 to rotate. The fan blade 19 draws outside air into the air duct 18. The air is heated by the electric heating wire 20 to form a hot airflow. The hot airflow enters the through pipe 7 through the air delivery pipe 21 and is sprayed from the air jet 8 onto the coal sample in the screen frame 4 to dry and disperse the wet coal sample and prevent coal particles from sticking together. Example

[0029] Specifically, such as Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the transmission mechanism includes a first bevel gear set 25, which is mounted on the surface of the drive rod 10 and located inside the housing 16. The right inner wall of the housing 16 is connected to the right end bearing of the transmission rod 26, and the front end of the transmission rod 26 is fixedly connected to the first bevel gear set 25. A second bevel gear set 27 is mounted on the surface of the transmission rod 26, and the second bevel gear set 27 is fixedly connected to the front end of the rotating shaft 17.

[0030] With the above structure, when the drive rod 10 rotates, it drives the first bevel gear set 25 to rotate. The first bevel gear set 25 drives the transmission rod 26 to rotate. The transmission rod 26 drives the rotating shaft 17 to rotate through the second bevel gear set 27, which in turn drives the fan blade 19 to rotate, thereby realizing the hot airflow delivery. In this embodiment, the use of gear transmission can improve the stability and reliability of the transmission. At the same time, by controlling the transmission ratio of the first bevel gear set 25 and the second bevel gear set 27, the rotating shaft 17 can be rotated at high speed, thereby increasing the airflow velocity.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screening device for coal testing in thermal power plants, comprising a base plate (1) and a screening box (2) fixedly mounted on its top surface by a support rod, characterized in that: The top front end of the screening box (2) is fixedly provided with a feed hopper (3), and a screen frame (4) is provided below the feed hopper (3). The screen frame (4) is movably provided inside the screening box (2), and multiple screen holes are evenly provided at the bottom of the screen frame (4). A first discharge channel (5) is provided through the center of the bottom of the screening box (2), and a second discharge channel (6) is fixedly provided through the rear end of the bottom of the screening box (2). Multiple through pipes (7) are evenly provided above the screen frame (4) from front to right, and multiple air jets (8) are evenly provided at the bottom of the through pipes (7). The front side wall of the screening box (2) is provided with a drive mechanism for the reciprocating movement of the screen frame (4), and the front end of the drive mechanism is provided with a power mechanism. The right side of the screening box (2) is provided with a gas supply mechanism, and the gas supply mechanism is connected to the drive mechanism through a transmission mechanism.

2. The screening equipment for coal testing in thermal power plants according to claim 1, characterized in that, The left and right side walls of the screen frame (4) are fixedly equipped with sliding plates (9) at both ends, and the sliding plates (9) slide through the side wall of the screening box (2).

3. A screening device for coal testing in thermal power plants according to claim 1, characterized in that, The driving mechanism includes a driving rod (10), which passes through the front side wall of the screening box (2) through a bearing. A turntable (11) is coaxially fixedly installed at the rear end of the driving rod (10). A driving pin (12) is fixedly installed at an eccentric position on the rear side of the turntable (11). A fixed seat (13) is provided on the rear side of the turntable (11). A strip groove (14) is opened on the front side of the fixed seat (13). The driving pin (12) extends into the strip groove (14), and the diameter of the driving pin (12) matches the width of the strip groove (14).

4. A screening device for coal testing in thermal power plants according to claim 3, characterized in that, The power mechanism includes a motor (15), the shaft end of the motor (15) is keyed to the front end of the drive rod (10), and the motor (15) is fixedly installed on the front inner wall of the housing (16). The housing (16) is fixedly installed on the front side of the screening box (2), and the drive rod (10) passes through the rear side wall of the housing (16) through a bearing.

5. A screening device for coal testing in thermal power plants according to claim 4, characterized in that, The gas delivery mechanism includes a rotating shaft (17), which passes through the rear side wall of the housing (16) through a bearing and is located on the rear side of the screening box (2). A wind duct (18) is fixedly installed on the right side wall of the screening box (2), and the rear end of the rotating shaft (17) extends into the wind duct (18). A fan blade (19) is coaxially fixedly installed on the rear end of the rotating shaft (17). Multiple electric heating wires (20) are provided on the rear side of the fan blade (19), and the electric heating wires (20) are fixedly installed on the inner wall of the wind duct (18). A gas delivery pipe (21) is fixedly connected to the rear end of the wind duct (18), and the gas delivery pipe (21) is fixedly connected to the right end of the connecting pipe (7).

6. A screening device for coal testing in thermal power plants according to claim 5, characterized in that, The transmission mechanism includes a drive pulley (22), which is fixedly installed on the surface of the drive rod (10) and located inside the housing (16). The drive pulley (22) is connected to the driven pulley (24) via a belt (23), and the driven pulley (24) is coaxially fixedly installed at the front end of the rotating shaft (17).

7. A screening device for coal testing in thermal power plants according to claim 5, characterized in that, The transmission mechanism includes a first bevel gear set (25), which is mounted on the surface of the drive rod (10) and located inside the housing (16). The right inner wall of the housing (16) is connected to the right end bearing of the transmission rod (26), and the front end of the transmission rod (26) is fixedly connected to the first bevel gear set (25). A second bevel gear set (27) is mounted on the surface of the transmission rod (26), and the second bevel gear set (27) is fixedly connected to the front end of the rotating shaft (17).

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