A discharge mechanism of a turbo-powder feeder

Abstract

The application discloses a discharging mechanism of a impeller powder feeder, which comprises a material-uniformizing grid plate assembly arranged in the discharging port of the main body of the impeller powder feeder, wherein the material-uniformizing grid plate assembly is composed of movable grid plates, and the grid plates are provided with grids; and a linkage assembly is fixedly connected to the outer wall of the main body of the impeller powder feeder. The application designs the main body of the impeller powder feeder with the material-uniformizing grid plate assembly, and cooperates with the arrangement of the linkage assembly, so that the grid plates can automatically reciprocate when the impeller rotates, the grid plate divides the discharging port into a plurality of regularly distributed discharging holes, the pulverized coal flow is forced to be divided into a plurality of small branches, and then the small branches are converged, the uniformity of the discharging cross section is greatly improved, and after reciprocating, it is ensured that each grid hole continuously and smoothly discharges, the pulverized coal flow is changed from "pulse type" to "continuous type", and stability and uniformity in the time dimension are realized.

Description

Technical Field

[0001] This application relates to the field of pulverized coal feeding technology for thermal power plant boilers, and in particular to a discharge mechanism for an impeller pulverized coal feeder. Background Technology

[0002] The impeller feeder is a key piece of equipment widely used in the combustion system of power plant boilers. Its main function is to continuously, stably, and controllably transport pulverized coal from the storage bin to the conveying pipeline or burner. The stability and uniformity of its feed rate are directly related to the combustion efficiency, system thermal stability, and pollutant emission levels.

[0003] In the existing technology, conventional impeller feeders are usually driven by a motor to rotate the impeller shaft and the impeller fixed on it. The rotation of the impeller chamber carries the coal powder from the feed port to the discharge port and discharges it. As a special type of bulk material, pulverized coal is easily affected by its own viscosity, adhesion, particle size distribution, and internal pressure. When passing through a simple discharge port, it is prone to "pulsating" or "intermittent" flow phenomena. This is mainly because unstable cavities or bridging can easily form inside the pulverized coal flow during the discharge process, resulting in an unstable mass flow or pulsed flow instead of a continuous and uniform laminar flow.

[0004] This instability in the flow directly leads to fluctuations in the pulverized coal feed rate, causing deviations between the actual feed rate and the theoretically calculated or set value. These fluctuations further cause fluctuations in boiler combustion conditions, resulting in decreased combustion efficiency, uneven temperature distribution within the furnace, and even combustion instability.

[0005] In other words, existing technologies have the following technical problems: the design of the discharge port of a conventional impeller feeder is insufficient to overcome the pulsation and intermittent discharge of pulverized coal. Therefore, a discharge mechanism for an impeller feeder is proposed to address the above problems. Utility Model Content

[0006] This embodiment provides a discharge mechanism for an impeller feeder to solve the problem of pulverized coal discharge pulverization and intermittent discharge that is difficult to overcome in the design of the discharge port of the impeller feeder in the prior art.

[0007] According to one aspect of this application, a discharge mechanism for an impeller feeder is provided, comprising an impeller feeder body, an impeller shaft rotatably connected inside the impeller feeder body, an impeller fixedly connected to the arc-shaped wall of the impeller shaft, a drive motor fixedly connected to one side of the impeller feeder body, and the output shaft end of the drive motor fixedly connected to one end of the impeller shaft. The mechanism also includes a material distribution grid assembly disposed inside the discharge port of the impeller feeder body, the material distribution grid assembly being composed of a movable grid plate, the grid plate having grids, and a fixed... The fixed support has a connecting guide rod whose end extends beyond the impeller feeder body and is slidably connected to a through hole on the side wall of the impeller feeder body. A linkage assembly is fixedly connected to the outer wall of the impeller feeder body. The linkage assembly consists of a gear transmission part and a vibration conversion part. The gear transmission part is linked to the impeller shaft of the impeller feeder body, and the vibration conversion part is connected to the connecting guide rod. When the impeller feeder body is in working condition, the impeller shaft drives the gear transmission part to rotate, which in turn drives the vibration conversion part to vibrate, and the grid plate automatically reciprocates through the connecting guide rod.

[0008] The discharge mechanism of the impeller powder feeder includes a fixed frame for the material distribution grid assembly. The fixed frame is fixedly installed in the inner cavity of the discharge port, and the grid is installed on the fixed frame and slides between the grid and the fixed frame.

[0009] The discharge mechanism of the impeller powder feeder has L-shaped protrusions extending from both sides of the fixed frame to form guide rails, and the two sides of the grid plate recessed inward to form guide grooves, with the guide rails and guide grooves slidingly engaged.

[0010] The discharge mechanism of the impeller feeder has an inclined surface on the inner side of the fixed frame.

[0011] The discharge mechanism of the impeller feeder comprises a gear transmission unit consisting of a first gear and a second gear. A connecting shaft is fixedly connected to the center of the first gear. The connecting shaft is located on the side wall of the other side of the impeller feeder body and is rotatably connected to the impeller feeder body. One end of the connecting shaft is connected to the impeller shaft of the impeller feeder body. A support shaft is provided on the outside of the other side of the impeller feeder body. The first bevel gear and the second gear are coaxially fixed and rotatably connected to the support shaft. A fixed bracket is also provided on the outside of the other side of the impeller feeder body. A rotating rod is rotatably connected to the fixed bracket. A second bevel gear is fixedly connected to the top end of the rotating rod. The second gear meshes with the first gear, and the first bevel gear meshes with the second bevel gear.

[0012] In the discharge mechanism of the impeller feeder, the diameter of the first gear is larger than the diameter of the second gear.

[0013] The discharge mechanism of the impeller feeder, wherein the vibration conversion part is composed of a disc and a crank, the disc is fixedly mounted at the bottom end of the rotating rod, a rocker arm is provided on one side of the bottom surface of the disc, one end of the crank is hinged to the rocker arm, and the other end of the crank is hinged to the connecting guide rod through a pin.

[0014] The discharge mechanism of the impeller feeder comprises a vibration conversion unit consisting of a rotating disk and a contact wheel. The rotating disk is fixedly mounted at the bottom end of a rotating rod. The outer edge of the rotating disk is provided with multiple protrusions spaced around it. A support rod is provided at the end of the connecting guide rod, and a wheel frame is provided at the end of the support rod. A rotatable contact wheel is provided on the wheel frame. A circular plate is sleeved on the support rod near its end. A return spring is sleeved on the outside of the support rod and the connecting guide rod between the circular plate and the side wall of the impeller feeder body. The contact wheel contacts the arc-shaped wall of the rotating disk.

[0015] In order to solve the problem in the prior art where ordinary impeller feeders simply use a discharge port when discharging coal powder, the coal powder is prone to pulverization and discontinuity during the discharge movement, resulting in fluctuations in the coal powder feed rate, this application designs an impeller feeder body with a uniform grate assembly. With the help of the linkage assembly, the grate can automatically reciprocate and vibrate when the impeller rotates. The grate itself divides the discharge port into multiple regularly distributed discharge holes, thereby forcing the coal powder flow to be divided into many small branches before merging. This greatly improves the uniformity of the discharge cross-section. At the same time, the reciprocating vibration ensures that each grate hole discharges continuously and smoothly. The vibration changes the coal powder flow from "pulsating" to "continuous", achieving stability and uniformity in the time dimension. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the bottom planar structure of this utility model; Figure 3 This is a three-dimensional schematic diagram of the material distribution grid assembly of this utility model; Figure 4 This is a plan view of the material distribution grid assembly of this utility model; Figure 5 for Figure 1 A magnified schematic diagram of the local structure at point A; Figure 6 This is a cross-sectional structural diagram of the fixed frame of this utility model; Figure 7 This is a schematic diagram of the internal structure of the present invention; Figure 8 This is a schematic diagram of the structure of the second embodiment of the present utility model; Figure 9 for Figure 8 A magnified structural diagram at point B in the middle.

[0018] In the diagram: 1. Impeller feeder body; 101. Feed inlet; 102. Discharge outlet; 103. Impeller shaft; 104. Impeller; 105. Drive motor; 2. Material distribution grid assembly; 201. Fixed frame; 202. Grid plate; 203. Grid; 204. Guide rail; 205. Fixed legs; 206. Connecting guide rod; 207. Guide groove; 208. Inclined surface; 3. Linkage assembly; 301. Connecting shaft; 302. 303. First gear; 304. Second gear; 305. First bevel gear; 306. Fixed bracket; 307. Rotating rod; 308. Second bevel gear; 309. Disc; 300. Crank; 310. Pin; 311. Rotating disk; 312. Support rod; 313. Circular plate; 314. Wheel frame; 315. Contact wheel; 316. Return spring; 317. Protrusion; 318. Support shaft; 319. Rocker arm. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] In the diagram: 1. Impeller feeder body; 101. Feed inlet; 102. Discharge outlet; 103. Impeller shaft; 104. Impeller; 105. Drive motor; 2. Material distribution grid assembly; 201. Fixed frame; 202. Grid plate; 203. Grid; 204. Guide rail; 205. Fixed legs; 206. Connecting guide rod; 207. Guide groove; 208. Inclined surface; 3. Linkage assembly; 301. Connecting shaft; 302. 303. First gear; 304. Second gear; 305. First bevel gear; 306. Fixed bracket; 307. Rotating rod; 308. Second bevel gear; 309. Disc; 300. Crank; 310. Pin; 311. Rotating disk; 312. Support rod; 313. Circular plate; 314. Wheel frame; 315. Contact wheel; 316. Return spring; 317. Protrusion; 318. Support shaft; 319. Rocker arm.

[0021] Please refer to the discharge mechanism of an impeller powder feeder. Figure 7 As shown, the device includes an impeller feeder body 1, an impeller shaft 103 is rotatably connected inside the impeller feeder body 1, an impeller 104 is fixedly connected to the arc-shaped wall of the impeller shaft 103, a drive motor 105 is fixedly connected to one side of the impeller feeder body 1, and the end of the output shaft of the drive motor 105 is fixedly connected to one end of the impeller shaft 103. Through this technical solution, the operation of the drive motor 105 can drive the impeller shaft 103 to rotate, thereby driving the impeller 104 to rotate. The rotation of the impeller shaft 103 can also drive the impeller 104 to rotate.

[0022] Please see Figures 2-5 As shown, it also includes a material equalization grid assembly 2 disposed inside the discharge port 102 of the impeller feeder body 1. The material equalization grid assembly 2 is composed of a movable grid plate 202, on which grids 203 are provided. A fixed bracket 205 is fixedly connected to the bottom wall of the grid plate 202. A connecting guide rod 206 is fixedly connected to the side wall of the fixed bracket 205, with its end extending outside the impeller feeder body 1 and slidably connected to a through hole provided on the side wall of the impeller feeder body 1. A linkage assembly 3 is fixedly connected to the outer wall of the impeller feeder body 1. The linkage assembly 3 is composed of a gear transmission part and a vibration conversion part. The gear linkage part is linked with the impeller shaft 103 of the impeller feeder body 1, and the vibration conversion part is connected to the connecting guide rod 206. When the impeller feeder body 1 is in working state, the impeller shaft 103 drives the gear transmission part to rotate, thereby driving the vibration conversion part to vibrate, and the grid plate 202 automatically reciprocates through the connecting guide rod 206. To address the problem in existing technologies where ordinary impeller feeders (body 1) simply use a discharge port, leading to pulverization and intermittent flow of pulverized coal during discharge, resulting in fluctuating feed rates, this application designs an impeller feeder body 1 with a uniform grate assembly 2. Combined with a linkage assembly 3, this design automatically causes the grate 202 to reciprocate during impeller rotation. The grate itself divides the discharge port into multiple regularly distributed discharge holes, forcing the pulverized coal flow to be split into many small streams before merging, significantly improving the uniformity of the discharge cross-section. Furthermore, the reciprocating vibration ensures continuous and unobstructed discharge from each grate hole. The vibration transforms the pulverized coal flow from a "pulsating" to a "continuous" flow, achieving stability and uniformity over time. The movement of the connecting guide rod 206 can drive the grate 202 to move, achieving the function of reciprocating vibration.

[0023] Please see Figure 2 As shown, the material distribution grid assembly 2 also includes a fixed frame 201, which is fixedly disposed in the inner cavity of the discharge port 102. The grid plate 202 is disposed on the fixed frame 201 and slides between the grid plate and the fixed frame 201. The fixed frame 201 is fixed to the inner wall of the discharge port 102 by welding or bolting to ensure its connection strength and stability under vibration. The fixed frame 201 is preferably made of wear-resistant alloy steel to resist long-term erosion and wear from coal powder.

[0024] Please see Figure 3 As shown, L-shaped protrusions extend from both sides of the fixed frame 201 to form guide rails 204, and the two sides of the grid plate 202 are recessed inward to form guide grooves 207. The guide rails 204 and guide grooves 207 slide together. This technical solution, through the design of the sliding structure, enables the grid plate 202 to achieve relatively stable linear sliding, thereby further realizing the effect of reciprocating vibration. Specifically, the fit clearance between the guide rail 204 and the guide groove 207 is 0.1mm~0.3mm. This clearance design ensures that the grid plate 202 can slide smoothly back and forth, while minimizing the risk of coal dust entering the sliding pair and causing jamming.

[0025] Please see Figure 6 As shown, a slope 208 is provided on the inner side of the fixed frame 201; With this technical solution, the inclined surface 208 allows the falling coal powder to slide and gather at the grid plate 202, and then fall through the grid 203.

[0026] Please see Figure 5As shown, the gear transmission unit consists of a first gear 302 and a second gear 303. A connecting shaft 301 is fixedly connected to the center of the first gear 302. The connecting shaft 301 is located on the side wall of the other side of the impeller feeder body 1 and is rotatably connected to the impeller feeder body 1. One end of the connecting shaft 301 is connected to the impeller shaft 103 of the impeller feeder body 1. A support shaft 318 is provided on the outside of the other side of the impeller feeder body 1. The first bevel gear 304 and the second gear 303 are coaxially fixed and rotatably connected to the support shaft 318. A fixed bracket 305 is also provided on the outside of the other side of the impeller feeder body 1. A rotating rod 306 is rotatably connected to the fixed bracket 305. A second bevel gear 307 is fixedly connected to the top of the rotating rod 306. The second gear 303 meshes with the first gear 302, and the first bevel gear 304 meshes with the second bevel gear 307. With this technical solution, when the impeller of the impeller feeder body 1 rotates, it can automatically drive the first gear 302 to rotate, which in turn drives the second gear 303 to rotate, thereby driving the first bevel gear 304 to rotate. The first bevel gear 304 drives the second bevel gear 307 to rotate, which in turn drives the rotating rod 306 to rotate, thus realizing the transmission function.

[0027] Please see Figure 1 As shown, the diameter of the first gear 302 is larger than the diameter of the second gear 303; In this technical solution, the diameter of the first gear 302 is larger than the diameter of the second gear 303. This allows the rotating rod 306 to rotate at a faster speed, thereby increasing the reciprocating vibration frequency of the grid plate 202. Preferably, the tooth ratio of the first gear 302 to the second gear 303 is 2:1 to 3:1. By setting this reduction ratio, the lower rotational speed of the impeller shaft can be converted into the higher rotational speed of the second gear 303, laying the foundation for subsequently increasing the vibration frequency.

[0028] Example 1 of the vibration conversion unit: Please see Figures 3-5 As shown, the vibration conversion unit consists of a disc 308 and a crank 309. The disc 308 is fixedly mounted at the bottom end of the rotating rod 306. A rocker arm 319 is provided on one side of the bottom surface of the disc 308. One end of the crank 309 is hinged to the rocker arm 319, and the other end of the crank 309 is hinged to the connecting guide rod 206 through a pin 310. With this technical solution, when the rotating rod 306 rotates, it can drive the disk 308 to rotate, thereby driving the connecting guide rod 206 to reciprocate through the rotation of the disk 308 to the crank 309, thus realizing the reciprocating vibration function of the grid plate 202.

[0029] Example 2 of the vibration conversion unit: Please see Figure 8and 9 As shown, the vibration conversion unit consists of a rotating disk 311 and a contact wheel 315. The rotating disk 311 is fixedly installed at the bottom end of the rotating rod 306. The outer edge of the rotating disk 311 is provided with a plurality of protrusions 317 spaced around it. A support rod 312 is provided at the end of the connecting guide rod 206. A wheel frame 314 is provided at the end of the support rod 312. A rotatable contact wheel 315 is provided on the wheel frame 314. A circular plate 313 is sleeved on the support rod 312 near the end. A return spring 316 is sleeved on the outside of the support rod 312 and the connecting guide rod 206 between the circular plate 313 and the side wall of the impeller powder feeder body 1. The contact wheel 315 contacts the arc-shaped wall of the rotating disk 311. With this technical solution, when the rotating rod 306 rotates, it can drive the rotating disk 311 to rotate. When the protrusion 317 rotates and contacts the contact wheel 315, it can push the contact wheel 315 to move, thereby pushing the support rod 312 to move, which in turn pushes the connecting guide rod 206 to move, and finally pushes the grid plate 202 to move. The reset spring 316 is set so that when the contact wheel 315 is not in contact with the outer edge of the rotating disk 311 at a position where there is no protrusion 317, the reset spring 316 lifts the circular plate 313, causing the grid plate 202 to move in the opposite direction. Thus, the reciprocating vibration function of the grid plate 202 is realized when the contact wheel 315 and the protrusion 317 are in intermittent contact.

[0030] Preferably, the reciprocating vibration frequency of the grid plate 202 is linearly positively correlated with the rotational speed of the impeller shaft. This means that the powder feeding rate of the powder feeder changes synchronously with the vibration frequency. The vibration enhances the continuity and uniformity of the output, but its fundamental rhythm is still determined by the rotational speed of the main impeller, realizing automatic linkage between powder feeding rate and uniform material effect without the need for additional control unit and power source.

[0031] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A discharge mechanism for an impeller feeder, comprising an impeller feeder body (1), wherein an impeller shaft (103) is rotatably connected inside the impeller feeder body (1), an impeller (104) is fixedly connected to the arc-shaped wall of the impeller shaft (103), and a drive motor (105) is fixedly connected to one side of the impeller feeder body (1), wherein the end of the output shaft of the drive motor (105) is fixedly connected to one end of the impeller shaft (103), characterized in that: It also includes a material distribution grid assembly (2) disposed inside the discharge port (102) of the impeller feeder body (1). The material distribution grid assembly (2) is composed of a movable grid plate (202). The grid plate (202) is provided with a grid (203). A fixed bracket (205) is fixedly connected to the bottom wall of the grid plate (202). A connecting guide rod (205) with an end extending outside the impeller feeder body (1) and slidably connected to the side wall of the fixed bracket (205) is fixedly connected to the side wall of the fixed bracket (205). 6) A linkage assembly (3) is fixedly connected to the outer wall of the impeller feeder body (1). The linkage assembly (3) consists of a gear transmission part and a vibration conversion part. The gear linkage part is linked with the impeller shaft (103) of the impeller feeder body (1). The vibration conversion part is connected to the connecting guide rod (206). When the impeller feeder body (1) is in working state, the impeller shaft (103) drives the gear transmission part to rotate, thereby driving the vibration conversion part to vibrate, and the grid plate (202) automatically reciprocates through the connecting guide rod (206).

2. The discharge mechanism of the impeller feeder according to claim 1, characterized in that: The material distribution grid assembly (2) further includes a fixed frame (201), which is fixedly disposed in the inner cavity of the discharge port (102), and the grid plate (202) is disposed on the fixed frame (201) and slides between the grid plate (202) and the fixed frame (201).

3. The discharge mechanism of the impeller feeder according to claim 2, characterized in that: The fixed frame (201) extends L-shaped protrusions on both sides to form guide rails (204), and the grid plate (202) is recessed inward on both sides to form guide grooves (207). The guide rails (204) and guide grooves (207) slide together.

4. The discharge mechanism of the impeller feeder according to claim 2, characterized in that: The fixed frame (201) has an inclined surface (208) on its inner side.

5. The discharge mechanism of the impeller feeder according to claim 1, characterized in that: The gear transmission unit consists of a first gear (302) and a second gear (303). A connecting shaft (301) is fixedly connected to the center of the first gear (302). The connecting shaft (301) is located on the side wall of the impeller feeder body (1) on the other side and is rotatably connected to the impeller feeder body (1). One end of the connecting shaft (301) is connected to the impeller shaft (103) of the impeller feeder body (1). A support shaft (318) is provided on the outside of the other side of the impeller feeder body (1). The first cone Gear (304) and second gear (303) are coaxially fixed and rotatably connected to support shaft (318). A fixed bracket (305) is also provided on the outside of the other side of the impeller feeder body (1). A rotating rod (306) is rotatably connected to the fixed bracket (305). A second bevel gear (307) is fixedly connected to the top of the rotating rod (306). The second gear (303) meshes with the first gear (302), and the first bevel gear (304) meshes with the second bevel gear (307).

6. The discharge mechanism of the impeller feeder according to claim 5, characterized in that: The diameter of the first gear (302) is larger than the diameter of the second gear (303).

7. The discharge mechanism of the impeller feeder according to claim 5, characterized in that: The vibration conversion unit consists of a disc (308) and a crank (309). The disc (308) is fixedly mounted on the bottom end of the rotating rod (306). A rocker arm (319) is provided on one side of the bottom surface of the disc (308). One end of the crank (309) is hinged to the rocker arm (319), and the other end of the crank (309) is hinged to the connecting guide rod (206) through a pin (310).

8. The discharge mechanism of the impeller feeder according to claim 5, characterized in that: The vibration conversion unit consists of a rotating disk (311) and a contact wheel (315). The rotating disk (311) is fixedly installed at the bottom end of the rotating rod (306). The outer edge of the rotating disk (311) is provided with a plurality of protrusions (317) spaced around it. A support rod (312) is provided at the end of the connecting guide rod (206). A wheel frame (314) is provided at the end of the support rod (312). A rotatable contact wheel (315) is provided on the wheel frame (314). A circular plate (313) is sleeved on the support rod (312) near the end. A return spring (316) is sleeved on the outside of the support rod (312) and the connecting guide rod (206) between the circular plate (313) and the side wall of the impeller powder feeder body (1). The contact wheel (315) contacts the arc-shaped wall of the rotating disk (311).

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