Fire coal metering device for thermal power plant

Abstract

The utility model discloses a fire coal metering device for a thermal power plant, and relates to the field of fire coal metering. A thermal power plant fire coal metering device comprises a fire coal conveying belt body and further comprises a supporting frame fixedly installed at the feeding end of the fire coal conveying belt body; the fire coal temporary storage bin is fixedly mounted on the supporting frame; the conveying cylinder is fixedly mounted at a discharge hole in the bottom of the fire coal temporary storage bin; according to the utility model, only the mechanical structures of the driving shaft and the spiral conveying blade need to be stable, after the proportional relation is calibrated, the metering precision is more stable, the fire coal can be metered more accurately, and the device adopts a spiral conveying mode, so that the problem of deviation of the conveying belt does not need to be considered, and the working efficiency is greatly improved. According to the utility model, the metering error caused by deviation of the conveying belt is avoided, the reliability and stability of metering are improved, the equipment maintenance and calibration work caused by deviation of the conveying belt is reduced, and the operation cost and the maintenance workload are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of coal metering technology, specifically, it relates to a coal metering device for thermal power plants. Background Technology

[0002] In the production and operation of thermal power plants, accurate measurement of coal is of great significance for cost control, energy management and environmental monitoring. Traditional coal measurement in thermal power plants mainly relies on belt scales, which usually use a combination of weighing sensors and speed sensors to achieve the measurement function.

[0003] However, during the use of traditional belt scales, the weighing sensors are easily affected by environmental factors, which may cause the belt scale to read even when no material is passing through, directly affecting the accuracy of measurement. Secondly, the characteristics of coal itself also have a significant impact on the accuracy of traditional belt scales. The particle size of coal is often different and unevenly distributed. During belt conveying, large coal particles may concentrate on one side of the belt or form irregular piles, resulting in uneven force on the belt scale. This may cause the belt to deviate, affecting the measurement accuracy. In severe cases, it may also increase the friction between the belt and the weighing frame and other equipment, or even damage the equipment, increase maintenance costs and downtime, and have an adverse impact on the normal production and operation of thermal power plants. In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a coal metering device for thermal power plants that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: a coal metering device for thermal power plants, including a coal conveyor belt body, and further including: a support frame, fixedly installed at the feeding end of the coal conveyor belt body; a coal temporary storage bin, fixedly installed on the support frame; a conveying cylinder, fixedly installed at the discharge port at the bottom of the coal temporary storage bin; a motor, installed at the upper end of the coal temporary storage bin through a cross mounting bracket; a drive shaft, vertically arranged inside the coal temporary storage bin and the conveying cylinder, and its upper end is fixedly connected to the output end of the motor; a spiral conveying blade, fixedly installed on the drive shaft at a position inside the conveying cylinder; and a rotation sensor for monitoring the number of rotations of the drive shaft, connected to the drive shaft through a transmission assembly.

[0006] Furthermore, the transmission assembly includes a first pulley and a second pulley. The first pulley is fixedly connected to the drive shaft, and the second pulley is fixedly connected to the speed measuring gear of the revolution sensor through a connecting shaft. The first pulley and the second pulley are connected by a belt.

[0007] To facilitate the guidance of the coal so that it can flow towards the conveyor, a guide slope is provided inside the coal storage bin near the discharge port.

[0008] To prevent coal from accumulating at the discharge port of the coal storage silo, the drive shaft is further equipped with multiple rows of agitators at equal intervals around its circumference.

[0009] To facilitate easier assembly and disassembly of the spiral conveyor blades, the four ends of the cross mounting frame are fixedly connected with elastic claw plates, and the cross mounting frame is detachably connected to the coal storage bin via the elastic claw plates.

[0010] To ensure that the cross-shaped mounting bracket can be more securely positioned on the coal storage bin, the coal storage bin is further designed in a conical shape.

[0011] To prevent the coal from shifting to one side of the conveyor belt, fan-shaped guide plates are symmetrically fixedly connected to both sides of the lower port of the conveyor cylinder.

[0012] After adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: By using the cooperation of components such as motor, drive shaft, spiral conveying blades, conveying cylinder, conveying assembly and rotation sensor, this utility model can achieve relatively stable measurement accuracy by ensuring the mechanical structure of its drive shaft and spiral conveying blades is stable. Furthermore, after calibrating the proportional relationship, it can accurately measure the coal. Moreover, this device adopts a spiral conveying method, eliminating the need to consider the problem of conveyor belt deviation, avoiding measurement errors caused by conveyor belt deviation, improving the reliability and stability of measurement, reducing equipment maintenance and calibration work caused by conveyor belt deviation, and lowering operating costs and maintenance workload.

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] In the attached diagram:

[0015] Figure 1 This is a schematic diagram of the structure of the coal temporary storage bin in this utility model, which is installed on the coal conveyor belt body by a support frame;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model;

[0017] Figure 3 This is a partial cross-sectional structural diagram of the present invention;

[0018] Figure 4This utility model Figure 3 A schematic diagram of the structure of part A.

[0019] In the diagram: 1. Coal conveyor belt body; 2. Support frame; 201. Coal storage bin; 202. Conveying cylinder; 203. Fan-shaped guide plate; 3. Cross mounting frame; 301. Elastic claw plate; 302. Motor; 303. Drive shaft; 304. Spiral conveying blade; 305. Stirring rod; 306. First pulley; 307. Second pulley; 308. Belt; 309. Rotation sensor; 2011. Guide inclined surface. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] Example 1:

[0022] Reference Figures 1-4 A coal metering device for a thermal power plant includes a coal conveyor belt body 1, and further includes: a support frame 2, fixedly installed at the feeding end of the coal conveyor belt body 1; a coal temporary storage bin 201, fixedly installed on the support frame 2; a conveying cylinder 202, fixedly installed at the discharge port at the bottom of the coal temporary storage bin 201; a motor 302, installed at the upper end of the coal temporary storage bin 201 via a cross mounting bracket 3; a drive shaft 303, vertically arranged inside the coal temporary storage bin 201 and the conveying cylinder 202, with its upper end fixedly connected to the output end of the motor 302; a spiral conveying blade 304, fixedly installed on the drive shaft 303 at a position inside the conveying cylinder 202; and a rotation sensor 309 for monitoring the number of rotations of the drive shaft 303, connected to the drive shaft 303 via a transmission assembly.

[0023] The transmission assembly includes a first pulley 306 and a second pulley 307. The first pulley 306 is fixedly connected to the drive shaft 303, and the second pulley 307 is fixedly connected to the speed measuring gear of the revolution sensor 309 through a connecting shaft. The first pulley 306 and the second pulley 307 are connected by a belt 308.

[0024] In a thermal power plant, when it is necessary to feed coal into the combustion furnace for power generation, the coal conveyor belt body 1 is first installed next to the combustion furnace. Then, the coal can be fed into the coal storage bin 201. When the coal storage bin 201 contains a certain amount of coal, the motor 302 can be started. When the motor 302 starts, the drive shaft 303 starts to rotate. As the drive shaft 303 rotates, the spiral conveyor blades 304 will transport the coal at the bottom outlet of the coal storage bin 201 along the conveyor cylinder 202 onto the conveyor belt of the coal conveyor belt body 1. Then, the control of the conveyor belt rotation is started, and the conveyor belt will continuously transport the coal into the combustion furnace.

[0025] During the rotation of the drive shaft 303, the rotation of the drive shaft 303 is transmitted to the rotation sensor 309 through the transmission assembly. The first pulley 306 in the transmission assembly is fixed on the drive shaft 303. As the drive shaft 303 rotates together, the first pulley 306 drives the second pulley 307 to rotate through the belt 308. The second pulley 307 is fixedly connected to the speed measuring gear of the rotation sensor 309 through the connecting shaft, so that the rotation sensor 309 can monitor the number of rotations of the drive shaft 303 in real time. Since there is a certain proportional relationship between the number of rotations of the drive shaft 303 and the conveying capacity of the screw conveyor blade 304, by pre-calibrating this proportional relationship, the amount of coal conveyed can be calculated based on the number of rotations of the drive shaft 303 monitored by the rotation sensor 309, thereby achieving accurate measurement of coal.

[0026] Traditional belt scales, which use a combination of load cells and speed sensors, are susceptible to various factors. For example, load cells can experience zero-point drift due to changes in ambient temperature, leading to measurement errors. This device, however, measures the quantity of coal by using a fixed ratio between the number of rotations of the drive shaft 303 and the conveying capacity of the screw conveyor blades 304. As long as the mechanical structures of the drive shaft 303 and the screw conveyor blades 304 are stable, the measurement accuracy is relatively stable. Furthermore, once the ratio is calibrated, the measurement accuracy can be further stabilized, enabling more precise measurement of coal.

[0027] In traditional belt scales, if the conveyor belt deviates during operation, the material distribution on the conveyor belt will be uneven, which will affect the force on the weighing sensor and lead to inaccurate measurement results. However, this device uses a screw conveyor, which eliminates the need to consider the problem of conveyor belt deviation, avoids the measurement error caused by conveyor belt deviation, improves the reliability and stability of measurement, reduces the equipment maintenance and calibration work caused by conveyor belt deviation, and lowers operating costs and maintenance workload.

[0028] Example 2:

[0029] Reference Figures 1-4A coal metering device for a thermal power plant is basically the same as that in Embodiment 1, but with the following additional feature: a guide inclined surface 2011 is provided inside the coal storage bin 201 near the discharge port. The guide inclined surface 2011 can guide the coal so that the coal in the surrounding area can flow to the conveying cylinder 202.

[0030] The drive shaft 303 is located inside the coal storage bin 201 and is equipped with multiple rows of stirring rods 305 at equal intervals around its circumference. The stirring rods 305 can disturb the coal and prevent it from accumulating at the discharge port of the coal storage bin 201, thus affecting the amount of coal discharged.

[0031] Example 3:

[0032] Reference Figures 1-4 A coal metering device for a thermal power plant is basically the same as that in Embodiment 2, but with the following additional feature: each of the four ends of the cross mounting frame 3 is fixedly connected with an elastic claw plate 301. The cross mounting frame 3 is detachably connected to the coal storage bin 201 through the elastic claw plates 301. With the setting of the elastic claw plates 301, when it is necessary to remove the spiral conveying blade 304 from the conveying cylinder 202 for maintenance, the cross mounting frame 3 can be lifted directly upwards, which effectively improves the convenience of the device.

[0033] like Figure 2 As shown, the coal storage bin 201 has a conical design. When the cross mounting bracket 3 is engaged with the opening of the coal storage bin 201 by the elastic claw plate 301, the elastic claw plate 301 can be tilted, so that the cross mounting bracket 3 can be more stably positioned on the coal storage bin 201.

[0034] A fan-shaped guide plate 203 is symmetrically fixedly connected to both sides of the lower end of the conveyor cylinder 202. When the coal is conveyed from the conveyor cylinder 202 to the conveyor belt of the coal conveyor belt body 1, the fan-shaped guide plate 203 can limit and guide the coal, so that the coal can be located in a relatively middle position of the conveyor belt, and avoid the coal being located on one side of the conveyor belt and causing it to deviate, thus effectively ensuring the stability of the conveyor belt.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model.

Claims

1. A coal metering device for a coal-fired power plant, characterized by, The utility model relates to a kind of coal conveying belt body (1) comprising coal, further comprising: Support frame (2), fixedly installed in the feeding end of the coal conveying belt body (1); Coal temporary storage bin (201), fixedly installed on the support frame (2); Conveying cylinder (202), fixedly installed at the discharge port of the bottom of the coal temporary storage bin (201); Motor (302), installed in the upper end of the coal temporary storage bin (201) by cross mounting bracket (3); Drive shaft (303), vertically arranged inside the coal temporary storage bin (201), conveying cylinder (202), and the upper end is fixedly connected with the output end of the motor (302); Spiral conveying blade (304), fixedly installed on the drive shaft (303) at the position inside conveying cylinder (202); Number of turns sensor (309) for monitoring the number of turns of the drive shaft (303), connected with the drive shaft (303) by transmission assembly.

2. A coal metering device for a coal-fired power plant according to claim 1, characterized in that, The transmission assembly includes first pulley (306), second pulley (307), the first pulley (306) is fixedly connected on drive shaft (303), the second pulley (307) is fixedly connected with the speed measuring gear of number of turns sensor (309) by connecting shaft, the first pulley (306) is connected by belt (308) between second pulley (307).

3. The coal metering device for coal-fired power plants according to claim 1, characterized in that, The position close to the discharge port inside the coal temporary storage bin (201) is provided with flow guide inclined surface (2011).

4. A coal metering device for a coal-fired power plant according to claim 2, characterized in that, The drive shaft (303) is circumferentially equidistantly installed with multiple rows of stirring rods (305) at the position inside the coal temporary storage bin (201).

5. A coal metering device for a coal-fired power plant according to claim 1, characterized in that, Four end portions of the cross mounting bracket (3) are fixedly connected with elastic claw plate (301), and the cross mounting bracket (3) is detachably connected between the coal temporary storage bin (201) through the elastic claw plate (301).

6. A coal metering device for a coal-fired power plant according to claim 5, characterized in that, The coal temporary storage bin (201) is conical design.

7. A coal metering device for a coal-fired power plant according to claim 1, characterized in that, The lower port of the conveying cylinder (202) is fixedly connected with fan-shaped flow guide plate (203) on both sides in symmetry.

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