阅读说明：本技术 一种具有物流密度自校准功能的埋刮板给煤机 (Embedded scraper coal feeder with logistics density self-calibration function ) 是由 王林 杨博 赵景涛 高景辉 宋晓辉 赵晖 张亚夫 王红雨 孟颖琪 于 2020-08-21 设计创作，主要内容包括：本发明公开了一种具有物流密度自校准功能的埋刮板给煤机,包括埋刮板给煤机本体、取样筒、电机、螺旋给料机、量筒、电子天平及给煤机就地控制器；取样筒的一端插入于埋刮板给煤机本体的校准取样口内,电机的输出轴与螺旋给料机的驱动轴相连接,螺旋给料机位于取样筒内,取样筒的另一端设置有出样口,量筒位于出样口的正下方,量筒的内壁上设置有料位开关,其中,量筒位于电子天平上,电子天平的输出端与给煤机就地控制器的输入端相连接,给煤机就地控制器的输出端与埋刮板给煤机本体的控制端相连接,该给煤机能够较为准确的测量给煤量。(The invention discloses an embedded scraper coal feeder with a logistics density self-calibration function, which comprises an embedded scraper coal feeder body, a sampling cylinder, a motor, a screw feeder, a measuring cylinder, an electronic balance and a coal feeder local controller, wherein the embedded scraper coal feeder body is provided with a sampling cylinder; one end of a sampling cylinder is inserted into a calibration sampling port of the buried scraper coal feeder body, an output shaft of a motor is connected with a driving shaft of a screw feeder, the screw feeder is positioned in the sampling cylinder, the other end of the sampling cylinder is provided with a sample outlet, a measuring cylinder is positioned under the sample outlet, and a material level switch is arranged on the inner wall of the measuring cylinder.)

1. An embedded scraper coal feeder with a logistics density self-calibration function is characterized by comprising an embedded scraper coal feeder body, a sampling cylinder (21), a motor (23), a screw feeder (22), a measuring cylinder (26), an electronic balance (27) and a coal feeder local controller (28);

one end of a sampling cylinder (21) is inserted into a calibration sampling port (16) of the buried scraper coal feeder body, an output shaft of a motor (23) is connected with a driving shaft of a screw feeder (22), the screw feeder (22) is positioned in the sampling cylinder (21), a sample outlet (24) is arranged at the other end of the sampling cylinder (21), a measuring cylinder (26) is positioned right below the sample outlet (24), a material level switch (25) is arranged on the inner wall of the measuring cylinder (26), the measuring cylinder (26) is positioned on an electronic balance (27), the output end of the electronic balance (27) is connected with the input end of a coal feeder local controller (28), and the output end of the coal feeder local controller (28) is connected with the control end of the buried scraper coal feeder body.

2. The coal submerged scraper feeder with the logistics density self-calibration function as claimed in claim 1, characterized in that the coal submerged scraper feeder body comprises a sealing box body (13), a driving chain wheel (14), a chain (17) and a driven chain wheel (18), wherein the chain (17) bypasses the driving chain wheel (14) and the driven chain wheel (18), a plurality of scrapers (12) are arranged on the chain (17), a coal inlet (11) is arranged at the top of one end of the sealing box body (13), a coal outlet (15) is arranged at the bottom of the other end of the sealing box body (13), and the calibration sampling port (16) is located between the driving chain wheel (14) and the driven chain wheel (18).

3. The submerged scraper coal feeder with self-calibration function of material flow density as claimed in claim 2, characterized in that the scrapers (12) are equally spaced.

4. The underground scraper coal feeder with self-calibration function of material flow density as claimed in claim 1, further comprising a spring tensioner for tensioning the driven sprocket (18).

5. The coal submerged scraper feeder with self-calibration function for material flow density as claimed in claim 1, characterized in that the outer wall of the sampling cylinder (21) is sealed with the calibration sampling port (16).

6. The coal submerged scraper feeder with self-calibration function for material flow density as claimed in claim 1, characterized in that the level switch (25) is a photoelectric level switch.

7. The submerged scraper coal feeder with self-calibration function of material flow density as claimed in claim 1, characterized in that the bottom of the measuring cylinder (26) is provided with a rotating device for rotating the measuring cylinder (26) so that the coal in the measuring cylinder (26) is poured out.

Technical Field

The invention relates to an embedded scraper coal feeder, in particular to an embedded scraper coal feeder with a logistics density self-calibration function.

Background

The buried scraper coal feeder is one kind of coal feeder in coal pulverizing system of heat power plant. The coal powder can be continuously and uniformly fed into a steel ball coal mill, a medium-speed coal mill and a fan coal mill to form coal powder for a boiler of a power station.

The coal feeder with embedded scraper mainly consists of front and back chain wheels and a conveying chain hung on the two chain wheels, and a plurality of scrapers are distributed on the chain at equal distance.

The buried scraper coal feeder forms continuous coal bed flow along the movement direction of the scraper chain 1 in the box body by utilizing the action of the friction force of coal and the drag force of the scraper chain, and the coal bed flow continuously flows from a coal inlet to a coal outlet (entering a coal mill), so that the continuous, uniform and quantitative material conveying task is realized. The buried scraper coal feeder can adjust the coal feeding amount through the thickness of a coal seam, and can also change the rotating speed of a driving chain wheel by using a frequency converter to realize the adjustment of the coal feeding amount.

The advantage of burying scraper feeder firstly can satisfy long distance transport demand, is particularly useful for fan coal pulverizer. The fan coal mill utilizes high-temperature flue gas, hot secondary air, cold furnace smoke and the like of a boiler as drying media of raw coal, the inlet and outlet pipelines of the coal mill are thick, the occupied area is large, and the coal feeder has to be placed in an area far away from the coal mill, so that long-distance coal conveying is required. Secondly, the equipment is high temperature resistant. The inlet air temperature of the coal mill is as high as 400 ℃, the chain and the scraper of the buried scraper type coal feeder are made of metal, so that the buried scraper type coal feeder cannot be scalded and has no ignition risk.

The buried scraper coal feeder applied to a power plant has the serious problem of inaccurate coal feeding amount measurement. The buried scraper coal feeder is limited by the structure principle, a weighing device is not arranged, the coal quantity of the whole machine is measured by manually setting the material flow density rho and the sectional area S, then the scraper chain speed V actually measured by a sensor is utilized, and finally the real-time coal feeding quantity M is calculated to be rho multiplied by S multiplied by V.

The coal quality of the actual coal used by the power plant is not uniform and stable and is unchanged. The coal density is influenced by various factors such as the storage time of a mining area and a coal yard, the compaction degree of a coal pile, the atmospheric humidity and the like, the coal density is objectively fluctuated, namely the logistics density rho is changed in real time and is kept unchanged in a manual setting mode, and the coal feeding amount can obviously not be accurately measured. The coal feeding amount is not accurately measured, the coal consumption of the unit for power generation is difficult to calculate accurately, and the economic quality of the unit is difficult to evaluate.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an embedded scraper coal feeder with a logistics density self-calibration function, and the embedded scraper coal feeder can accurately measure the coal feeding amount.

In order to achieve the aim, the embedded scraper coal feeder with the logistics density self-calibration function comprises an embedded scraper coal feeder body, a sampling cylinder, a motor, a screw feeder, a measuring cylinder, an electronic balance and a coal feeder local controller;

one end of a sampling cylinder is inserted into a calibration sampling port of the buried scraper coal feeder body, an output shaft of a motor is connected with a driving shaft of a screw feeder, the screw feeder is positioned in the sampling cylinder, a sample outlet is formed in the other end of the sampling cylinder, a measuring cylinder is positioned right below the sample outlet, and a material level switch is arranged on the inner wall of the measuring cylinder, wherein the measuring cylinder is positioned on an electronic balance, the output end of the electronic balance is connected with the input end of a coal feeder local controller, and the output end of the coal feeder local controller is connected with the control end of the buried scraper coal feeder body.

The buried scraper coal feeder body comprises a sealing box body, a driving chain wheel, a chain and a driven chain wheel, the chain is wound around the driving chain wheel and the driven chain wheel, a plurality of scraper plates are arranged on the chain, a coal inlet is formed in the top of one end of the sealing box body, a coal outlet is formed in the bottom of the other end of the sealing box body, and a calibration sampling port is located between the driving chain wheel and the driven chain wheel.

The scrapers are distributed at equal intervals.

A spring tensioner for tensioning the driven sprocket is also included.

The outer wall of the sampling cylinder is sealed with the calibration sampling port.

The material level switch is a photoelectric material level switch.

The bottom of the measuring cylinder is provided with a rotating device which is used for rotating the measuring cylinder so as to pour the coal in the measuring cylinder.

The invention has the following beneficial effects:

when the embedded scraper coal feeder with the logistics density self-calibration function is in specific operation, the spiral feeder is arranged in the sampling cylinder, coal is conveyed into the sample outlet from one end of the sampling cylinder through the spiral feeder, the coal falls into the measuring cylinder through the sample outlet, and after the coal falls to the full level, the coal feeder local controller controls the electronic balance to start working, so that the coal feeding amount is calculated.

Drawings

FIG. 1 is a schematic structural view of a coal feeder body with an embedded scraper 12 according to the present invention;

fig. 2 is a schematic structural diagram of the present invention.

Wherein 11 is a coal inlet, 12 is a scraper, 13 is a sealed box body, 14 is a driving chain wheel, 15 is a coal outlet, 16 is a calibration sampling port, 17 is a chain, 18 is a driven chain wheel, 21 is a sampling cylinder, 22 is a screw feeder, 23 is a motor, 24 is a sampling port, 25 is a material level switch, 26 is a measuring cylinder 26, 27 is an electronic balance, and 28 is a coal feeder local controller.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 and 2, the embedded scraper coal feeder with the logistics density self-calibration function of the invention comprises an embedded scraper coal feeder body, a sampling barrel 21, a motor 23, a screw feeder 22, a measuring barrel 26, an electronic balance 27 and a coal feeder local controller 28; one end of the sampling cylinder 21 is inserted into the calibration sampling port 16 of the buried scraper coal feeder body, the output shaft of the motor 23 is connected with the driving shaft of the screw feeder 22, the screw feeder 22 is positioned in the sampling cylinder 21, the other end of the sampling cylinder 21 is provided with a sample outlet 24, the measuring cylinder 26 is positioned right below the sample outlet 24, the inner wall of the measuring cylinder 26 is provided with a material level switch 25, wherein the measuring cylinder 26 is positioned on an electronic balance 27, the output end of the electronic balance 27 is connected with the input end of the coal feeder local controller 28, and the output end of the coal feeder local controller 28 is connected with the control end of the buried scraper coal feeder body.

The buried scraper coal feeder body comprises a sealed box body 13, a driving chain wheel 14, a chain 17 and a driven chain wheel 18, wherein the chain 17 bypasses the driving chain wheel 14 and the driven chain wheel 18, a plurality of scraper blades 12 are arranged on the chain 17, a coal inlet 11 is arranged at the top of one end of the sealed box body 13, a coal outlet 15 is arranged at the bottom of the other end of the sealed box body 13, a calibration sampling port 16 is positioned between the driving chain wheel 14 and the driven chain wheel 18, and the scraper blades 12 are distributed at equal intervals.

The present invention also includes a spring tensioner for tensioning the driven sprocket 18; the outer wall of the sampling cylinder 21 is sealed with the calibration sampling port 16; the material level switch 25 is a photoelectric material level switch; the bottom of the measuring cylinder 26 is provided with a rotating device for rotating the measuring cylinder 26 so that the coal in the measuring cylinder 26 is poured out.

Equidistant scraper blade 12 of installing on chain 17, chain 17 is under the suitable condition of elasticity adjustment, scraper blade 12 can keep vertical state, possess the ability of better promotion coal heap, chain 17 and scraper blade 12 are the metal material, possess the characteristic of sturdy and durable high temperature resistance, driven sprocket 18 has spring overspeed device tensioner, make chain 17 be in suitable elasticity through spring overspeed device tensioner, calibration sample connection 16 is installed between drive sprocket 14 and driven sprocket 18, the regional coal heap of middle part, compare into, go out the coal mouth 15 region, have better whole representativeness.

The screw feeder 22 is arranged in the sampling cylinder 21, coal is conveyed from one end of the sampling cylinder 21 to the sample outlet 24 through the sample outlet 24 by the rotation of the guide vane, the coal falls into the measuring cylinder 26 through the sample outlet 24, after the coal is fully fallen, the material level switch 25 is shielded, the coal feeder local controller 28 controls the electronic balance 27 to start working, the electronic balance 27 conveys the weighed mass result M to the coal feeder local controller 28, the coal feeder local controller 28 calculates the material flow density rho (t) of the coal at the time t according to rho (t) ═ M (t)/V (t) due to the fixed volume V of the measuring cylinder 26, the coal feeder local controller 28 calculates the material flow density rho (t) at the time t, the coal feeding amount M (t) ═ rho (t) × S × V (t), rho is the material flow density, S is the sectional area, and V is the speed.