A method for stabilizing the machine speed of a belt roasting machine production line

Abstract

The present invention discloses a method for stabilizing the machine speed of a belt roasting machine production line, which includes arranging a 3D scanner at the head of a wide belt of the belt roasting machine to identify the height of the raw ball material layer and automatically calculate the material quantity, adjusting the wide belt machine speed in real time according to the fluctuation of the material quantity to stabilize the wide belt material quantity, thereby stabilizing the machine speed of the belt roasting machine, reducing the frequency of adjusting the machine speed of the roasting machine, and stabilizing the quality and energy consumption of the pellets. The present invention effectively stabilizes the machine speed, reduces fluctuations, stabilizes the quality of the finished pellets, and greatly reduces the process energy consumption and improves the service life of the equipment.

Description

Technical Field

[0001] The invention relates to the field of belt roasting machines, and in particular to a method for stabilizing the machine speed of a belt roasting machine production line. Background Art

[0002] As a high-quality blast furnace charge, pellets have the advantages of high cold strength, regular and uniform particle size, high iron grade, and long-distance transportation. In recent years, all steel companies have been pursuing high-ball ratio charge structure, so pellet production has developed rapidly. The belt roasting machine process has gradually grown into the mainstream process for pellet production and processing with its advantages of large-scale equipment, high degree of automation, convenient start and stop, low process energy consumption, and strong raw material adaptability.

[0003] Based on the current production status of various belt roasting machine production lines, for cost considerations, the raw materials for pellet production are mainly sourced from "hundreds of mines", which leads to instability in the moisture content of the raw materials. The instability in the moisture content of the raw materials directly leads to fluctuations in the amount of qualified raw balls in the raw ball preparation process. Therefore, for belt roasting machine production lines, the problem of fluctuations in the amount of raw balls leading to fluctuations in the speed of the belt roasting machine is particularly prominent. Large fluctuations in the speed of the belt roasting machine will lead to insufficient drying and roasting of the pellet ore, and the quality of the pellets will be affected; secondly, the faster the speed, the more heat and air volume will be required in a short time, which will greatly increase energy consumption and disrupt the inherent air flow balance, and the service life of the roasting machine trolley and railing will drop sharply.

[0004] Therefore, it is necessary to develop targeted methods to stabilize the machine speed of the belt roasting machine production line to solve the problems of pellet quality, energy consumption and equipment life caused by speed fluctuations. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a method for stabilizing the machine speed of a belt roasting machine production line, which can effectively stabilize the machine speed, reduce fluctuations, stabilize the quality of finished pellets, significantly reduce process energy consumption and increase equipment service life.

[0006] Technical solution: A method for stabilizing the machine speed of a belt roasting machine production line of the present invention is characterized by: by arranging a 3D scanner at the head of the wide belt of the belt roasting machine to identify the height of the raw ball material layer and automatically calculate the material quantity, and adjusting the wide belt speed in real time according to the fluctuation of the material quantity to stabilize the wide belt unloading amount, thereby stabilizing the speed of the belt roasting machine, reducing the frequency of adjusting the roasting machine speed, and stabilizing the quality and energy consumption of the pellets.

[0007] Among them, when the material quantity is automatically calculated, the wide belt material quantity is calculated in advance according to the material surface and pile specific gravity.

[0008] Wherein, the 3D scanner is arranged at a distance of 1m from the wide belt conveyor head.

[0009] The hourly material quantity entering the roasting machine trolley is determined according to the wide belt conveyor speed and the thickness of the bottom material.

[0010] Among them, according to the analysis results of the 3D scanner, it is judged whether the current wide belt material quantity meets the material quantity required by the current machine speed. If the material quantity is too large, the wide belt speed is reduced and the feeding amount is reduced; if the material quantity is too small, the wide belt speed is increased and the feeding amount is increased.

[0011] The raw balls are transported to the distribution roller screen through a wide belt for powder material screening and distribution.

[0012] Among them, after the distribution roller screen is screened and distributed, the qualified green balls are evenly distributed on the roasting trolley.

[0013] Among them, when the thickness of the bottom material of the trolley is constant, the speed of the trolley changes with the height of the material layer monitored by the radar level meter.

[0014] Among them, when the amount of raw ball material is large, that is, when the radar level meter detects a high material layer height, the trolley speed is forced to increase to ensure the consistency of the material layer thickness. Conversely, when the amount of raw ball material is small, that is, when the radar level meter detects a low material layer height, the trolley speed slows down.

[0015] Wherein, the height of the material on the trolley is 420mm-450mm.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention effectively stabilizes the machine speed, reduces fluctuations, stabilizes the quality of finished pellets, and significantly reduces process energy consumption and increases equipment life. It has important economic and management benefits, and greatly improves the efficiency and competitiveness of the belt pellet production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] In the figure, 1 is raw ball; 2 is wide belt; 3 is cloth roller screen; 4 is radar level meter; 5 is trolley; 6 is 3D scanner. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0020] The method for stabilizing the machine speed of the belt roasting machine production line of the present invention is to set a 3D scanner 6 at the head of the wide belt of the belt roasting machine to identify the material layer height of the raw ball 1 and automatically calculate the material amount, adjust the wide belt speed in real time according to the fluctuation of the material amount to stabilize the material amount of the wide belt 2, thereby stabilizing the speed of the belt roasting machine, reducing the frequency of adjusting the roasting machine speed, and stabilizing the quality and energy consumption of the pellets. Among them, when automatically calculating the material amount, the material amount of the wide belt 2 is calculated in advance according to the material surface and pile specific gravity. The 3D scanner 6 is set at a distance of 1m from the head of the wide belt. The hourly material amount entering the roasting machine trolley 5 is determined according to the speed of the wide belt 2 and the thickness of the bottom material. According to the analysis result of the 3D scanner 6, it is judged whether the current material amount of the wide belt 2 meets the material amount required by the current machine speed. If the material amount is too large, the belt speed of the wide belt 2 is reduced to reduce the feeding amount; if the material amount is too small, the belt speed of the wide belt 2 is accelerated to increase the feeding amount. The raw ball 1 is transported to the distribution roller screen 3 through the wide belt 2 for powder material screening and distribution. After screening and distribution by the material distribution roller screen 3, the qualified green balls 1 are evenly distributed on the roasting trolley 5. When the thickness of the bottom material of the trolley 5 is constant, the trolley speed changes with the material layer height monitored by the radar level meter 4. When the amount of green balls is large, that is, when the radar level meter 4 detects a high material layer height, the trolley speed is forced to increase to ensure the consistency of the material layer thickness. On the contrary, when the amount of green balls is small, that is, when the radar level meter 4 detects a low material layer height, the trolley speed slows down. The height of the material on the trolley 5 is 420mm-450mm.

[0021] The present invention has two control systems. System 1: Qualified raw balls are transported to the distribution roller screen through a wide belt for powder material screening and distribution, and qualified raw balls are evenly distributed on the roasting trolley. When the thickness of the bottom material of the trolley is constant, the trolley speed changes with the material layer height monitored by the radar level meter. When the amount of raw ball material is large, that is, when the material layer height is detected to be high, the trolley speed is forced to speed up to ensure the consistency of the material layer thickness. On the contrary, when the amount of raw ball material is small, that is, when the material layer height is detected to be low, the trolley speed slows down. Therefore, with the fluctuation of the amount of raw ball material, the speed of the trolley is always in a fluctuating state, which seriously affects the quality and energy consumption of the finished balls, as well as the service life of the equipment. In addition, the automatic adjustment has hysteresis and the manual adjustment has uncertainty, which will seriously affect the stable and smooth operation of the belt roasting machine.

[0022] System 2: Arrange 3D scanning (image recognition) at 1m from the head of the wide belt machine, calculate the material quantity based on the height, repose angle and stacking density of the incoming material, and then adjust the wide belt speed in a targeted manner based on the material quantity required for the current trolley speed, fix the feed amount, define the wide belt as an "intermediate buffer bin", stabilize the feed amount, and thus stabilize the roasting machine trolley speed.

[0023] The belt roaster produces pellets, requiring the material on the trolley to be fully spread, generally at a height of 420-450mm, in order to protect the trolley railing and the equipment. At the same time, a stable machine speed can ensure that the green balls stay for a sufficient time in the drying, preheating, roasting, and cooling stages to produce qualified finished balls; if the machine speed is too fast, the green balls will not stay long enough in each stage; if the machine speed is too slow, the green balls will be over-burned and the trolley equipment will stay in the high temperature section for a long time; therefore, for the roaster, a stable machine speed is crucial.

[0024] The present invention effectively stabilizes the machine speed, reduces fluctuations, stabilizes the quality of finished pellets, and significantly reduces process energy consumption and increases equipment life. It has important economic and management benefits, and greatly improves the efficiency and competitiveness of the belt pellet production line.

Claims

1. A method for stabilizing the machine speed of a belt roasting machine production line, characterized in that: A 3D scanner (6) is arranged at the head of the wide belt of the belt roasting machine to identify the height of the raw ball (1) material layer and automatically calculate the material quantity. The wide belt speed is adjusted in real time according to the fluctuation of the material quantity to stabilize the material discharge quantity of the wide belt (2), thereby stabilizing the speed of the belt roasting machine, reducing the frequency of adjusting the roasting machine speed, and stabilizing the quality and energy consumption of the pellets.

2. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 1, characterized in that: When the material quantity is automatically calculated, the material quantity of the wide belt (2) is calculated in advance according to the material surface and bulk density.

3. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 2, characterized in that: The 3D scanner (6) is arranged at a distance of 1 m from the wide belt conveyor head.

4. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 3, characterized in that: The hourly material quantity entering the roasting machine trolley (5) is determined according to the speed of the wide belt (2) and the thickness of the bottom material.

5. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 4, characterized in that: According to the analysis result of the 3D scanner (6), it is judged whether the current material quantity of the wide belt (2) meets the material quantity required by the current machine speed. If the material quantity is too large, the speed of the wide belt (2) is reduced to reduce the feeding amount; If the material quantity is too small, increase the speed of the wide belt (2) to increase the feeding quantity.

6. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 5, characterized in that: The green balls (1) are transported to the distribution roller screen (3) via a wide belt (2) for powdery material screening and distribution.

7. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 6, characterized in that: After screening and distributing by the distribution roller screen (3), the qualified green balls (1) are evenly distributed on the roasting trolley (5).

8. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 7, characterized in that: When the thickness of the bottom material of the trolley (5) is constant, the speed of the trolley varies with the height of the material layer monitored by the radar level meter (4).

9. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 8, characterized in that: When the amount of raw ball material is large, that is, when the radar level meter (4) detects a high material layer height, the trolley speed is forced to increase to ensure the consistency of the material layer thickness. On the contrary, when the amount of raw ball material is small, that is, when the radar level meter (4) detects a low material layer height, the trolley speed is slowed down.

10. The method for stabilizing the machine speed of a belt roasting machine production line according to claim 9, characterized in that: The height of the material on the trolley (5) is 420mm-450mm.

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