Coal boiler roller screen

Abstract

The utility model discloses a kind of boiler coal-feeding roller shaft screens, belong to boiler coal-feeding roller shaft screen technical field, including: frame, the upper surface of one end of frame is equipped with hopper, the other end is equipped with discharge port;Multiple roller shafts, multiple roller shafts are rotatably installed in the inside of frame, and the height of multiple roller shafts gradually reduces along the direction of hopper to discharge port;Multiple suction pipes, multiple suction pipes are fixedly installed on the end face of frame away from discharge port, and communicate with external negative pressure equipment, the utility model can reduce the generation of dust, simultaneously through suction pipe can suck away the dust generated, so that dust diffusion into working environment can be avoided, reduce the influence to operator health.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler coal conveying roller screens, specifically to a boiler coal conveying roller screen. Background Technology

[0002] A boiler coal conveying roller screen is a screening device specifically designed for boiler coal conveying systems. It is primarily used to screen coal, removing large impurities and particles that do not meet size requirements, ensuring uniform coal particle size before it enters the boiler combustion system, thereby improving combustion efficiency and safety. Although the roller screen prevents material from jumping on the rollers during operation, thus reducing dust generation to some extent, the large drop distance and lack of buffering structure when coal falls from the rollers easily cause dust to be stirred up again. To address these issues, this invention provides a boiler coal conveying roller screen. Utility Model Content

[0003] In view of the above-mentioned technical deficiencies, the purpose of this utility model is to provide a boiler coal conveying roller screen. By setting the receiving plate, the generation of dust can be reduced, and the generated dust can be extracted by the exhaust pipe, thereby preventing the dust from spreading into the working environment and reducing the impact on the health of operators.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a boiler coal conveying roller screen, comprising: A frame, wherein a hopper is provided on the upper side of one end of the frame and a discharge port is provided on the other end; Multiple rollers are rotatably mounted inside the frame, and the height of the multiple rollers gradually decreases along the direction from the hopper to the discharge port; Multiple air extraction pipes are fixedly installed on the end face of the frame away from the discharge port and are connected to an external negative pressure device.

[0005] Preferably, the position where the air extraction pipe communicates with the frame is aligned with the axis of the roller located at the highest point.

[0006] Preferably, a receiving plate is provided below the roller, the receiving plate is inclined, and the height of the end of the receiving plate near the discharge port is lower than the height of the end near the hopper.

[0007] Preferably, the end of the receiving plate near the discharge port is bent downward to form a guide slope.

[0008] Preferably, the inner wall of the lower side of the frame is inclined, and the height of the end near the hopper is lower than the height of the other end. The end of the frame near the hopper is provided with a discharge port, and a baffle is provided on the outside of the discharge port.

[0009] Preferably, the receiving plate is made of elastic rubber.

[0010] Preferably, the hopper is equipped with a diversion section inside, which diverts the coal entering the hopper, dispersing the coal into the interior of the frame. The diversion section includes: Multiple diversion bars are fixedly installed between the two side walls of the hopper and are distributed in multiple rows, with multiple diversion bars in adjacent rows being staggered.

[0011] Preferably, the width of the upper side of the cross-section of the diverter rod is smaller than the width of the lower side.

[0012] Preferably, a guide plate is fixedly connected inside the discharge port. One end of the guide plate extends to below the roller at the lowest point, and the other end extends to the outside of the frame. Both ends of the guide plate on the side outside the frame are folded upwards.

[0013] Preferably, air inflow channels are provided between the upper and lower sides of the guide plate and the inner sidewall of the frame.

[0014] The beneficial effects of this utility model are as follows: This invention, through the design of an extraction pipe and a receiving plate, enables the extraction pipe to connect with an external negative pressure device, and the position where the extraction pipe connects to the frame is aligned with the axis of the roller at its highest point. When coal is conveyed on the roller, the negative pressure device can promptly extract dust located above and below the roller through the extraction pipe, reducing dust diffusion into the working environment and minimizing its impact on the health of operators. Simultaneously, the elastic rubber receiving plate reduces the falling distance of coal slag and absorbs impact energy, further suppressing dust generation.

[0015] This utility model, through the setting of the receiving plate and the inclined surface of the lower inner side wall of the frame, enables the receiving plate to guide the coal slag falling from the roller to the lower inner side wall of the frame, and then discharge it through the discharge port. This allows the coal discharged through the roller and the screened coal slag to be discharged from the two sides of the frame respectively, thereby facilitating subsequent diversion work and improving conveying efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. 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 structure of this utility model (first perspective).

[0018] Figure 2 This is a schematic diagram of the structure of this utility model (second perspective).

[0019] Figure 3 This is a top view of the present invention.

[0020] Figure 4 This utility model Figure 3 Sectional view at point AA.

[0021] Figure 5 This is a schematic diagram of the structure of the diverter rod of this utility model.

[0022] Figure 6 This is a schematic diagram of the receiving plate of this utility model.

[0023] Explanation of reference numerals in the attached figures: 1. Frame, 2. Hopper, 3. Roller, 4. Air extraction pipe, 5. Receiving plate, 6. Baffle, 7. Diverter bar, 8. Guide plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0025] This utility model provides a boiler coal conveying roller screen, such as Figures 1 to 6 As shown.

[0026] Example 1: A boiler coal conveying roller screen includes a frame 1, with a hopper 2 on the upper side of one end and a discharge port at the other end. Multiple rollers 3 are rotatably mounted inside the frame 1, each driven by an external motor. The height of the rollers 3 gradually decreases from the hopper 2 to the discharge port. When coal enters the frame 1 from the hopper 2, the rollers 3 rotate. Due to the gradually decreasing height of the rollers 3, the coal moves towards the discharge port under its own weight and the rotation of the rollers 3. During this process, coal slag with a particle size smaller than the gap between two adjacent rollers 3 falls through the gap, while coal with a particle size larger than the gap between two adjacent rollers 3 is transported towards the discharge port by the rollers 3, thus achieving coal screening.

[0027] Multiple suction pipes 4 are fixedly installed on the end face of the frame 1 away from the discharge port. The suction pipes 4 are connected to the external negative pressure equipment, and the position where the suction pipes 4 connect to the frame 1 is aligned with the axis of the roller 3 located at the highest point. During the coal conveying process, the negative pressure equipment is activated, and air is drawn from the inside of the frame 1 through the suction pipes 4. Since the position of the suction pipes 4 is aligned with the axis of the roller 3 at the highest point, it can simultaneously extract dust located in the space above and below the roller 3. At the same time, outside air enters the inside of the frame 1 from the discharge port, forming an airflow that helps guide the dust to the suction pipes 4, enhancing the dust removal effect.

[0028] Example 2: Based on Embodiment 1, to further suppress dust generation, a receiving plate 5 is installed below the roller 3. The receiving plate 5 is inclined, with the end near the discharge port lower than the end near the hopper 2, and the end of the receiving plate 5 near the discharge port is bent downward to form a guide slope. When coal slag falls from the gap of the roller 3, it first lands on the receiving plate 5. Guided by the inclination angle of the receiving plate 5 and the guide slope, the coal slag flows more smoothly to the lower inner wall of the frame 1. Because the distance between the receiving plate 5 and the roller 3 is small, the falling height of the coal slag can be reduced, thereby suppressing dust generation. At the same time, the material of the receiving plate 5 is elastic rubber, whose elasticity can buffer the impact of the coal slag and reduce secondary dust. The inclined design of the receiving plate 5 guides the coal slag to the lower inner wall of the frame 1.

[0029] The lower inner wall of the frame 1 is a slope, and the height of the end near the hopper 2 is lower than the height of the end near the discharge port. After the coal slag falls on this slope, it flows along this slope to the discharge port provided on the end face of the frame 1 near the hopper 2, and is discharged through the discharge port. The baffle 6 on the outside of the discharge port can control the timing of coal slag discharge. Qualified coal is conveyed to the discharge port by the roller 3 and discharged through the guide plate 8 fixedly installed inside the discharge port, so that the coal and coal slag are discharged separately from both sides of the frame 1, which is convenient for subsequent diversion processing.

[0030] One end of the guide plate 8 extends to the bottom of the roller 3 at the lowest point, and the other end extends to the outside of the frame 1. Both ends of the guide plate 8 on the side outside the frame 1 are folded upwards. The coal material conveyed from the roller 3 to the discharge port falls on the guide plate 8 and is discharged outside the frame 1 through the guide plate 8. The folded-up parts at both ends prevent the coal material from falling.

[0031] The upper and lower sides of the guide plate 8 are provided with channels for air to flow in between the inner side wall of the frame 1. The air extraction pipe 4 works in conjunction with the negative pressure equipment to extract dust from the frame 1. Outside air enters the interior of the frame 1 through the channels on both sides of the guide plate 8, forming an airflow circulation, which further improves the dust removal effect. At the same time, outside air also enters the interior of the frame 1 through the hopper 2 to prevent dust from drifting into the outside air through the hopper 2.

[0032] Example 3: Based on Embodiment 2, to ensure the uniformity of screening, a diversion section is installed inside the hopper 2. The diversion section includes multiple diversion rods 7, which are fixedly installed between the two side walls of the hopper 2 and distributed in multiple rows, with adjacent rows of multiple diversion rods 7 staggered. After the coal enters the hopper 2, it is diverted by the staggered diversion rods 7 and dispersed into the frame 1, where it falls onto the rollers 3, preventing coal accumulation, local overload, and ensuring uniform screening.

[0033] The width of the upper side of the cross-section of the diverter 7 is smaller than that of the lower side. This shape design allows the coal to be more smoothly dispersed to both sides when it flows on the diverter 7, enhancing the diversion effect and ensuring that the coal enters the frame 1 evenly.

[0034] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A boiler coal conveying roller screen, characterized in that, include: A frame (1) is provided with a hopper (2) on the upper side of one end of the frame (1) and a discharge port on the other end; Multiple rollers (3) are rotatably mounted inside the frame (1), and the height of the multiple rollers (3) gradually decreases along the direction from the hopper (2) to the discharge port; Multiple suction pipes (4) are fixedly installed on the end face of the frame (1) away from the discharge port and connected to the external negative pressure equipment; The roller (3) is provided with a receiving plate (5) below it. The receiving plate (5) is inclined and the height of the end of the receiving plate (5) near the discharge port is lower than the height of the end near the hopper (2). The receiving plate (5) is bent downward at the end near the discharge port to form a guide slope.

2. The boiler coal conveying roller screen as described in claim 1, characterized in that, The position where the air extraction pipe (4) communicates with the frame (1) is aligned with the axis of the roller (3) located at the highest point.

3. A boiler coal conveying roller screen as described in claim 1, characterized in that, The inner wall of the lower side of the frame (1) is inclined, and the height of the end near the hopper (2) is lower than the height of the other end. The end of the frame (1) near the hopper (2) is provided with a discharge port, and a door (6) is provided on the outside of the discharge port.

4. A boiler coal conveying roller screen as described in claim 1, characterized in that, The material of the receiving plate (5) is elastic rubber.

5. A boiler coal conveying roller screen as described in claim 4, characterized in that, The hopper (2) is equipped with a diversion section, which diverts the coal entering the hopper (2) so that the coal is dispersed into the frame (1). The diversion section includes: Multiple diversion rods (7) are fixedly installed between the two side walls of the hopper (2) and distributed in multiple rows, with multiple diversion rods (7) in adjacent rows being staggered.

6. A boiler coal conveying roller screen as described in claim 5, characterized in that, The width of the upper side of the cross-section of the diverter rod (7) is smaller than the width of the lower side.

7. A boiler coal conveying roller screen as described in claim 1, characterized in that, A guide plate (8) is fixedly connected inside the discharge port. One end of the guide plate (8) extends to the bottom of the roller (3) at the lowest point, and the other end extends to the outside of the frame (1). Both ends of the guide plate (8) on the side outside the frame (1) are folded upward.

8. A boiler coal conveying roller screen as described in claim 7, characterized in that, The upper and lower sides of the guide plate (8) and the inner sidewall of the frame (1) are provided with channels for air to flow in.

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