CN113587671B - Control system for material layer thickness of sintering machine - Google Patents
Control system for material layer thickness of sintering machine Download PDFInfo
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- CN113587671B CN113587671B CN202111043971.0A CN202111043971A CN113587671B CN 113587671 B CN113587671 B CN 113587671B CN 202111043971 A CN202111043971 A CN 202111043971A CN 113587671 B CN113587671 B CN 113587671B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0075—Regulation of the charge quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
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Abstract
The application relates to the field of sinter production control, and provides a control system for the thickness of a material layer of a sintering machine. The control system of the material layer thickness of the sintering machine comprises a first layer thickness detection device, a second layer thickness detection device and a control device, wherein the first layer thickness detection device is arranged in front of a material pressing plate and is used for measuring the first material layer thickness in front of the material pressing plate; the second layer thickness detection device is arranged between the round roller and the multi-roller distributor and is used for measuring the thickness of a second material layer at the multi-roller distributor; the control device calculates according to the first material layer thickness and the second material layer thickness by using a related model, and controls the opening of the auxiliary door according to the calculation result, so as to accurately and timely control the material layer thickness in the material distribution process, achieve the purpose of accurate material distribution, effectively solve the problem that the material of the material pressing plate is excessively accumulated, be favorable for improving the quality of the sintering ore, and improve the utilization efficiency of the sintering machine. Moreover, the method and the device do not need manual operation, are low in maintenance cost, and are stable and reliable, and the number of matched devices is small.
Description
Technical Field
The application relates to the field of sinter production control, in particular to a control system for the thickness of a material layer of a sintering machine.
Background
The sintering is to mix iron ore powder, lime powder and coal powder in certain proportion and obtain sintered ore through full calcination. The sinter is mainly used for blast furnace iron making, and can improve the utilization coefficient of the blast furnace, reduce the coke ratio and improve the permeability of the blast furnace. In sintering production, the thickness and uniformity of material distribution can directly influence the burning-through condition of the sintering ore, so that the quality and the yield of the sintering ore are influenced. If the material layer in the material distribution link is too thick, the air permeability in the sintering process is poor, and the quality of the prepared sintering ore is poor; if the material layer in the material distribution link is too thin, the yield of the sintering ore becomes small, the production cost is increased, and the energy consumption is caused. Therefore, in order to improve the quality and yield of the sintered ore, the thickness of the material layer needs to be controlled in the material distribution link.
Referring to fig. 1, in the conventional material distribution link, the round roller 6 is uniformly divided into a plurality of areas, each area corresponds to one auxiliary door 8, the thickness of the material layer is controlled by adjusting the opening of the auxiliary door 8, the larger the opening of the auxiliary door 8 is, the larger the flow of the corresponding material distribution system to the sintering pallet is, the thicker the material layer thickness on the sintering pallet is, otherwise, the thinner the material layer thickness is.
In order to control the thickness of the material layer, in the prior art, a material layer thickness detection device 7 is installed at a position corresponding to each auxiliary door 8 before the material pressing plate 3 behind the nine-roller material distributor 4 and is used for detecting the thickness of the material layer on the sintering trolley 1 and controlling the opening of the corresponding auxiliary door 8 according to the thickness of the material layer. However, the installation position of the material layer thickness detection device 7 is closer to the rear than the position of the auxiliary door 8, and a certain time is required before the material flows from the auxiliary door 8 to the material pressing plate 3, so that serious hysteresis exists in the control of the opening of the auxiliary door, and thus the opening of the auxiliary door cannot be accurately and timely adjusted, and the uniformity of the material distribution is affected.
In addition, the pressing plate 3 is mainly used for leveling the fluctuating charge level. However, if the material is too high in front of the pressing plate 3, the material overflows the sintering pallet 1, and long-time backlog also causes the material air permeability to be reduced, which is not beneficial to sintering; if the front material of the pressing plate 3 is too low, the subsequent ignition depth is easy to be different. At present, a field operator judges the material stacking condition according to experience, and manually adjusts the opening of the auxiliary door to solve the problem of excessive material stacking in front of the material pressing plate 3, so that a great deal of manpower is consumed.
Disclosure of Invention
In order to overcome the defect of the prior art, the application aims at providing a control system for the material layer thickness of a sintering machine, so as to solve the problems that the material layer thickness control of the existing sintering machine is based on comparatively lagged measurement data, an operator is required to observe the material backlog condition before a material pressing plate in real time, the opening of an auxiliary door is manually adjusted, and then the material distribution is uneven and a large amount of manpower is consumed.
In order to achieve the above objective, the present application provides a system for controlling a material layer thickness of a sintering machine, which specifically includes: a first layer thickness detection device, a second layer thickness detection device and a control device; the first layer thickness detection device is arranged in front of the material pressing plate and is used for measuring the thickness of a first material layer in front of the material pressing plate and sending the thickness of the first material layer to the control device; the second layer thickness detection device is arranged between the round roller and the multi-roller distributing machine and is used for measuring the thickness of a second material layer at the multi-roller distributing machine and sending the thickness of the second material layer to the control device. The control device is configured to perform the steps of:
and obtaining the thickness of the standard material layer, the thickness of the first material layer and the thickness of the second material layer corresponding to any auxiliary door, wherein the thickness of the standard material layer is the height of the lowest end of the material pressing plate.
And obtaining the minimum proper thickness and the maximum proper thickness according to the standard material layer thickness and the preset error range.
And obtaining the target material layer thickness according to the minimum proper thickness and the maximum proper thickness.
And controlling the opening of the auxiliary door according to the thickness of the target material layer, the thickness of the first material layer and the thickness of the second material layer.
Further, according to the target material layer thickness, the first material layer thickness and the second material layer thickness, the specific method for controlling the opening of the auxiliary door is as follows:
and acquiring the width of the auxiliary door, the running speed of the sintering machine and the linear speed of the multi-roller distributor.
And obtaining a first material volume according to the target material layer thickness and the first material layer thickness.
And obtaining a second material volume according to the width of the auxiliary door, the running speed of the sintering machine, the linear speed of the multi-roller distributor, the thickness of the target material layer and the thickness of the second material layer.
And adjusting the opening of the auxiliary door according to the first material volume until the first material volume is equal to the second material volume.
Further, after the step of adjusting the opening of the auxiliary door according to the first material volume and the second material volume until the first material volume is equal to the second material volume, the method further comprises:
and obtaining the control material layer thickness according to the standard material layer thickness, the sintering machine running speed and the multi-roller distributing machine linear speed.
And adjusting the opening of the auxiliary door again, and controlling the thickness of the second material layer to be equal to the thickness of the control material layer.
Further, the thickness of the control material layer is determined as follows:
in the formula, h j To control the layer thickness, H is the standard layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader.
Further, by summing the minimum suitable thickness and the maximum suitable thickness and taking an average value, the target layer thickness is determined as follows:
H mid ＝(H min +H max )/2
wherein H is mid To target the material layer thickness H min To minimum proper thickness H max Is the maximum suitable thickness.
Further, when the thickness of the first material layer is greater than the maximum suitable thickness, the excessive material is indicated to be excessive before the material pressing plate, and at this time, the excessive material volume is taken as the first material volume, and the excessive material volume is determined to be:
wherein V is u For excessive material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
Further, when the thickness of the first material layer is greater than the maximum suitable thickness, the opening angle of the auxiliary door is reduced, and after a period of time, the material volume is reduced, at this time, the reduced material volume is used as a second material volume, and the reduced material volume is determined as follows:
wherein V is jd For reduced material volume, H is the standard material layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader, h t And t is the execution time for the second layer thickness.
Further, when the thickness of the first material layer is smaller than the minimum suitable thickness, the missing material is indicated before the material pressing plate, at this time, the missing material volume is taken as the first material volume, and the missing material volume is determined as follows:
wherein V is d For the missing material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
Further, when the thickness of the first material layer is smaller than the minimum suitable thickness, the opening angle of the auxiliary door is adjusted, the material volume is increased after a period of time, at this time, the increased material volume is used as the second material volume, and the increased material volume is determined as follows:
wherein V is ju For increasing the volume of the material, H is the thickness of the standard material layer, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader, h t And t is the execution time for the second layer thickness.
Further, the minimum suitable thickness is equal to the standard layer thickness.
The utility model provides a control system of sintering machine bed of material thickness through two places respectively install layer thickness detection device before nine roller cloth machine departments and the pressure flitch, be used for measuring nine roller cloth machine departments and the preceding bed of material thickness of pressure flitch respectively, controlling means is according to two places bed of material thickness data of receiving, the application is calculated again, and assist the door aperture according to operation result control, with accurate and timely control the bed of material thickness of cloth in-process, reach the purpose of accurate cloth, and can effectively solve the problem that the pressure flitch material is piled up too much, be favorable to improving the quality of sintering deposit, promote the utilization efficiency of sintering machine. Moreover, the method and the device do not need manual operation, are low in maintenance cost, and are stable and reliable, and the number of matched devices is small.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a distribution system involved in a sintering process;
fig. 2 is a schematic workflow diagram of a control system for sintering machine layer thickness according to an embodiment of the present application.
In the figure: the device comprises a 1-sintering machine trolley, a 2-first layer thickness detection device, a 3-pressing plate, a 4-nine-roller distributor, a 5-second layer thickness detection device, a 6-round roller, a 7-layer thickness detection device, an 8-auxiliary door and a 9-control device.
Detailed Description
The technical solutions in the embodiments of the present application will be fully and clearly described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In order to facilitate understanding of the technical solutions of the embodiments of the present application, some concepts related to the present application are first described below.
The material pressing plate has the effects that the fluctuating material level is compensated and leveled, the thickness of the material layer in front of the material pressing plate cannot be too high, the material level can be compacted (the air permeability is reduced), the material pressing plate is extruded, even the material overflows, meanwhile, the material is backlogged in front of the material pressing plate for a long time to cause dehydration, and the air permeability of the material is reduced; the material before the material pressing plate is too low to meet the requirement of smoothing the material surface, so that the condition of different ignition depths is caused. However, a certain time is needed before the material flows from the auxiliary gate to the pressing plate, and if the data before the pressing plate is directly detected, the auxiliary gate is controlled to have certain hysteresis. The material height of the multi-roller distributor can feed back the influence of the opening of the auxiliary door on the thickness of the material layer in real time. Therefore, the aim of timely and accurately controlling the opening of the auxiliary door can be achieved by integrating the thicknesses of the material layers at the two positions, so that the cloth is uniform.
The auxiliary gate is an actuating mechanism for controlling the material flow of the round roller feeder, and the size of the feed opening is controlled by adjusting the opening angle of the auxiliary gate, so that the purpose of controlling the material flow is achieved.
The sintering machine is provided with n auxiliary doors (n is an integer of 4-8), and the opening of the auxiliary doors is controlled to control the thickness of the material layer in front of the material pressing plate to be in a proper range [ H ] min ，H max ]In the process, the first layer thickness detection device is used for detecting the thickness of the material layer before the material pressing plate corresponding to each auxiliary door, and the thickness is expressed as: h is a 1 、h 2 、…h i 、…、h n . In the embodiment of the application, the backlog of the material in front of the material pressing plate can be regarded as a triangular column influenced by the repose angle, the repose angle of the material is set to be theta, and the height of the lowest end of the material pressing plate is the thickness H of the standard material layer; the running speed of the sintering machine trolley is v t The linear speed of the nine-roller material distributor is v j 。
Referring to fig. 1, a schematic diagram of a distribution system involved in a sintering process is shown. The application provides a control system of sintering machine bed of material thickness, specifically includes: the sintering machine trolley 1, a first layer thickness detection device 2, a pressing plate 3, a multi-roller distributor 4, a second layer thickness detection device 5, a round roller 6, an auxiliary door 8 and a control device 9. The first layer thickness detection device 2 is arranged in front of the material pressing plate 3 and is used for measuring the layer thickness in front of the material pressing plate 3, marking the measured layer thickness as a first layer thickness and sending the first layer thickness to the control device 9; the second layer thickness detection device 5 is arranged between the round roller 6 and the multi-roller distributor 4, and is used for measuring the layer thickness at the multi-roller distributor 4, marking the measured layer thickness as a second layer thickness, and sending the second layer thickness to the control device 9; in the figure, an arrow indicates the running direction of the sintering pallet 1.
Specifically, the multi-roll spreader includes various types, such as six rolls, seven rolls, nine rolls, and eleven rolls, and nine-roll spreaders are most commonly used in the sintering process, so nine-roll spreaders are selected as examples in the embodiments of the present application, so that the embodiments of the present application have a representative meaning.
Referring to fig. 2, a schematic workflow diagram of a system for controlling a layer thickness of a sintering machine according to an embodiment of the present application is provided. As can be seen from the figure, the control device 9 is configured to perform the following steps:
step S1: and obtaining the standard material layer thickness, the first material layer thickness and the second material layer thickness corresponding to the ith auxiliary door 8, wherein the standard material layer thickness is the height of the lowest end of the material pressing plate 3.
Step S2: and obtaining the minimum proper thickness and the maximum proper thickness according to the standard material layer thickness and the preset error range.
Specifically, the standard material layer thickness is added with a preset error range, so that a proper range of the material layer thickness can be obtained, and extreme values at two ends of the proper range are the minimum proper thickness and the maximum proper thickness. For example, when sintering a certain sinter, the height of the lowest end of the pressing plate 3 (i.e. the standard material layer thickness) is 0.8 m, the material air permeability in the sintering process is required to be slightly low, the error range is set to be [0.1,0.3], the proper range of the material layer thickness is [0.9,1.1], the minimum proper thickness is 0.9m, the maximum proper thickness is 1.1m, and the material layer thickness between 0.9m and 1.1m meets the production requirement.
Further, the minimum suitable thickness is equal to the standard layer thickness. Specifically, in the embodiment of the present application, the minimum suitable thickness is set to be the standard layer thickness (i.e. the height of the lowest end of the pressing plate 3), so that the minimum requirement of the sintering pallet 1 on the layer thickness can be met, but the minimum suitable thickness is not limited to the standard layer thickness, and can be set according to the specific requirement of the sintered ore. In this embodiment, still assuming that the height of the lowest end of the pressing plate 3 is 0.8 m, and the material air permeability in the sintering process is required to be normal, the error range is set to be [0,0.3], that is, the minimum suitable thickness is equal to the standard layer thickness, and then the suitable range of the layer thickness is [0.8,1.1].
Step S3: and obtaining the target material layer thickness according to the minimum proper thickness and the maximum proper thickness.
Further, by summing the minimum suitable thickness and the maximum suitable thickness and taking an average value, the target layer thickness is determined as follows:
H mid ＝(H min +H max )/2
wherein H is mid To target the material layer thickness H min To minimum proper thickness H max Is the maximum suitable thickness.
Specifically, in the embodiment of the present application, an intermediate value in a suitable range of the layer thickness is selected as the target layer thickness, and because the intermediate value is easy and convenient to calculate and is most representative, the intermediate value is the optimal choice of the target layer thickness. However, the target layer thickness is not limited to this intermediate value, and the method for determining the target layer thickness may be set according to the circumstances, for example, one third of the difference between the maximum suitable thickness and the minimum suitable thickness may be selected, and the minimum suitable thickness may be added as the target layer thickness, so long as the value is ensured to be between the minimum suitable thickness and the maximum suitable thickness.
Step S4: and controlling the opening of the auxiliary door according to the thickness of the target material layer, the thickness of the first material layer and the thickness of the second material layer.
Further, according to the target material layer thickness, the first material layer thickness and the second material layer thickness, the specific method for controlling the opening of the auxiliary door 8 is as follows:
step S41: the width of the auxiliary door 8, the running speed of the sintering machine trolley 1 and the linear speed of the nine-roller distributing machine 4 are obtained.
Step S42: and obtaining a first material volume according to the target material layer thickness and the first material layer thickness.
Step S43: and obtaining a second material volume according to the width of the auxiliary door 8, the running speed of the sintering machine trolley 1, the linear speed of the nine-roller distributor 4, the target material layer thickness and the second material layer thickness.
Step S44: and adjusting the opening of the auxiliary door 8 according to the first material volume until the first material volume is equal to the second material volume.
Step S45: and obtaining the control material layer thickness according to the standard material layer thickness, the running speed of the sintering machine trolley 1 and the linear speed of the nine-roller distributor 4.
Still further, the control layer thickness is determined as follows:
in the formula, h j To control the layer thickness, H is the standard layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader.
Step S46: and adjusting the opening of the auxiliary door 8 again, and controlling the thickness of the second material layer to be equal to the thickness of the control material layer.
In the embodiment of the present application, the execution of step S41 to step S46 is further specifically divided into two cases. The first case is the specific execution of steps S41 to S46 when the first layer thickness is greater than the maximum suitable thickness; the second case is the specific execution of steps S41 to S46 when the first layer thickness is smaller than the minimum suitable thickness.
Specifically, in the first case, that is, when the thickness of the first material layer is greater than the maximum suitable thickness, it indicates that the material is too much before the pressing plate 3, at this time, the excessive material volume is taken as the first material volume, and the excessive material volume is determined as follows:
wherein V is u For excessive material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
More specifically, when the firstA layer thickness greater than the maximum suitable thickness (i.e. h i ＞H max ) When the material at the ith auxiliary door 8 is required to be reduced by V u The material is controlled to be the target material layer thickness H before finally reaching the material pressing plate 3 mid . At this time, the angle of the opening of the auxiliary door 8 needs to be adjusted to be small, the volume of the material is reduced after a period of time, at this time, the reduced volume of the material is used as the volume of the second material, and the reduced volume of the material is determined as follows:
wherein V is jd For reduced material volume, H is the standard material layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader, h t And t is the execution time for the second layer thickness.
When the excess material volume is equal to the reduced material volume (i.e., V u ＝V jd ) In this case, it is explained that the thickness of the material layer in front of the pressing plate 3 falls within a reasonable range. If it is desired to rapidly reduce the backlog of material in front of the platen 3, the angle of the opening of the auxiliary door 8 may be optionally adjusted to a smaller angle to reduce the process execution time t.
When V is u ＝V jd Then, the opening of the auxiliary door 8 is regulated again, namely the opening angle of the auxiliary door 8 is moderately increased, so that the thickness of the cloth reaches the thickness h of the control material layer j That is to say, the second layer thickness at the nine-roller spreader 4 is kept to be controlled, i.e. h t ＝h j 。
After the above steps, in the first case, the control cycle of the i-th auxiliary door opening is completed.
And the same principle as the first case, and the second case, namely when the thickness of the first material layer is smaller than the minimum proper thickness, indicating that the material is missing before the material pressing plate 3, at this time, taking the missing material volume as the first material volume, and determining that the missing material volume is as follows:
wherein V is d For the missing material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
More specifically, when the first layer thickness is less than the minimum desired thickness (i.e., h i ＜H min ) When the material at the ith auxiliary door 8 is needed to be increased by V d The material is controlled to be the target material layer thickness H before finally reaching the material pressing plate 3 mid . At this time, the angle of the opening of the auxiliary door 8 needs to be adjusted, the volume of the material is increased after a period of time, at this time, the increased volume of the material is used as the volume of the second material, and the increased volume of the material is determined as follows:
wherein V is ju For increasing the volume of the material, H is the thickness of the standard material layer, v t For the running speed of the sintering machine trolley v j Is the linear speed of a nine-roller material distributor, h t And t is the execution time for the second layer thickness.
When the missing material volume is equal to the added material volume (i.e., V d ＝V ju ) In this case, the thickness of the material layer before the pressing plate 3 is increased to a reasonable range. If it is desired to rapidly increase the backlog before the platen 3, the angle of the opening of the auxiliary door 8 may be optionally adjusted to a larger angle to reduce the process execution time t.
When V is d ＝V ju Then, the opening of the auxiliary door 8 is regulated again, namely, the opening angle of the auxiliary door 8 is reduced moderately, so that the thickness of the cloth reaches the thickness h of the control material layer j That is to say, the second layer thickness at the nine-roller spreader 4 is kept to be controlled, i.e. h t ＝h j 。
After the above steps, in the second case, the control cycle of the i-th auxiliary door opening is completed.
To sum up, according to the embodiment of the application, through the control scheme, the opening degree of the auxiliary door 8 is controlled by utilizing the height data of the material at the position of the nine-roller material distributor 4, namely the height data of the material taken before the auxiliary door, so that the volume of the material before the material pressing plate 3 is controlled in a proper range, and the purpose of accurate material distribution is achieved. The embodiment of the application is characterized in that: the control is simple, and manual intervention is not required.
The following describes in detail a system for controlling the thickness of a sintering machine layer according to an embodiment of the present application through specific embodiments.
Assuming that the standard material layer thickness H=0.74 m in the sintering machine material distribution process flow, the preset error range is [0,0.3]]The minimum proper thickness of the material in front of the auxiliary door 8 is H min =h=0.74 m; the maximum proper thickness of the material in front of the auxiliary door 8 is H max =h+0.3m=1.04 m; according to the calculation formula, the target material layer thickness can be calculated as follows: h mid ＝(H+H max ) 2= (0.74 m+1.04 m)/2=0.89 m; the operation speed of the sintering machine trolley 1 is v, and the operation speed of the sintering machine trolley 1 is influenced by the operation speed of the trolley, the repose angle is set to be theta=60°, the width of the auxiliary door 8 is 0.9m t =0.05m/s, nine-roll spreader 4 linear velocity v j =0.5 m/s, assuming a bed thickness of h before the pressing plate 3 i When=1.1m, then calculate V u ＝0.108m 3 . At the moment, the angle of the opening of the auxiliary door 8 is properly adjusted to measure the material layer thickness h at the position of the nine-roller material distributor 4 t Time t=60 s is required to adjust the thickness of the layer before the pressing plate 3 to a proper range, =0.07 m; after the thickness of the material layer in front of the material pressing plate 3 is adjusted to a proper range, the opening angle of the auxiliary door is properly adjusted, and the thickness of the material layer at the position of the nine-roller material distributor 4 is controlled to be kept at h j It is sufficient to=0.074m until the control period ends.
In a specific application process, the embodiment of the application can also detect the auxiliary door blocking large block. When the large-block material is blocked at the auxiliary door 8, the material cannot smoothly flow from the auxiliary door 8 to the nine-roller distributor 4, and the distribution uniformity of the sintering machine is seriously affected. At present, whether the auxiliary door 8 is blocked or not is mainly judged by an operator through real-time monitoring of an industrial television, when the auxiliary door 8 is blocked, the opening angle of the auxiliary door 8 needs to be manually adjusted to be larger until the bulk materials fall down, and then the opening angle of the auxiliary door 8 is reduced to the original position. If the blocking is not timely processed, the thickness of the material layer on the sintering pallet 1 corresponding to the position of the auxiliary door 8 is seriously lower than the standard thickness, so that the ignition depth is affected, and the sintering quality and yield are reduced.
When the opening angle of the auxiliary door 8 is increased, the thickness of the material layer on the nine-roller material distributor 4 is correspondingly increased, and when the opening angle of the auxiliary door 8 is reduced, the thickness of the material layer on the corresponding nine-roller material distributor 4 is correspondingly reduced; when the opening angle of the auxiliary door 8 is unchanged, the thickness of the material layer on the nine-roller material distributor 4 can fluctuate within a reasonable range, namely the real-time value h of the material layer thickness on the nine-roller material distributor 4 under normal conditions j Average value of
The difference of (c) is smaller than the constant K. That is, the fluctuation value f is:
in the method, in the process of the invention,
is the average of n measured normal real-time layer thicknesses.
When the fluctuation value f is abnormal in the duration time t, the average material layer thickness under abnormal conditions is
When (when)
The condition that the auxiliary door 8 is blocked is described, the opening angle of the auxiliary door 8 is required to be gradually increased, and the average material layer thickness +_ corresponding to the movement on the nine-roller material distributor 4 is calculated in real time>
When the opening angle of the auxiliary door 8 is larger than the diameter of the large material, the material will naturally drop and the blockage will be dredged, that is, when +.>
And when the material flows out, the opening of the auxiliary door 8 is reduced to the original angle, so that the thickness of the material layer at the position of the nine-roller material distributor 4 is within a proper thickness range.
According to the embodiment of the application, whether the auxiliary door is blocked or not is judged through the detection data of the second layer thickness detection device 5 at the position of the nine-roller distributing machine 4. When abnormal conditions of blocking large blocks occur, the control system can feed back in time and rapidly process the blocking large blocks, so that the influence of the blocking large blocks of the auxiliary door 8 on the sintering process is reduced.
The application provides a control system for the thickness of a material layer of a sintering machine, which specifically comprises a first layer thickness detection device, a second layer thickness detection device and a control device; the first layer thickness detection device is arranged in front of the material pressing plate and is used for measuring the thickness of a first material layer in front of the material pressing plate and sending the thickness of the first material layer to the control device; the second layer thickness detection device is arranged between the round roller and the multi-roller distributing machine and is used for measuring the thickness of a second material layer at the multi-roller distributing machine and sending the thickness of the second material layer to the control device; the control device is configured to perform the steps of:
and obtaining the thickness of the standard material layer, the thickness of the first material layer and the thickness of the second material layer corresponding to any auxiliary door, wherein the thickness of the standard material layer is the height of the lowest end of the material pressing plate.
And obtaining the minimum proper thickness and the maximum proper thickness according to the standard material layer thickness and the preset error range.
And obtaining the target material layer thickness according to the minimum proper thickness and the maximum proper thickness.
And controlling the opening of the auxiliary door according to the thickness of the target material layer, the thickness of the first material layer and the thickness of the second material layer.
According to the technical scheme, the control system for the material layer thickness of the sintering machine is provided, the layer thickness detection devices are respectively arranged at the position of the nine-roller material distributor and the front two positions of the material pressing plate and are respectively used for measuring the material layer thickness of the position of the nine-roller material distributor and the front two positions of the material pressing plate, the control device is used for carrying out operation according to the received two-position material layer thickness data and then using a related model, and the opening degree of the auxiliary door is controlled according to the operation result so as to accurately and timely control the material layer thickness in the material distribution process, the aim of accurate material distribution is achieved, the problem that the material of the material pressing plate is excessively accumulated can be effectively solved, the quality of sintered ores is improved, and the utilization efficiency of the sintering machine is improved. Moreover, the method and the device do not need manual operation, are low in maintenance cost, and are stable and reliable, and the number of matched devices is small.
The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (10)
1. The control system of the material layer thickness of the sintering machine is characterized by comprising a first layer thickness detection device, a second layer thickness detection device and a control device; the first layer thickness detection device is arranged in front of the material pressing plate and is used for measuring the thickness of a first material layer in front of the material pressing plate and sending the thickness of the first material layer to the control device; the second layer thickness detection device is arranged between the round roller and the multi-roller distributing machine and is used for measuring the thickness of a second material layer at the multi-roller distributing machine and sending the thickness of the second material layer to the control device; the control device is configured to perform the steps of:
the method comprises the steps of obtaining the thickness of a standard material layer, the thickness of a first material layer and the thickness of a second material layer corresponding to any auxiliary door, wherein the thickness of the standard material layer is the height of the lowest end of a material pressing plate;
obtaining the minimum proper thickness and the maximum proper thickness according to the standard material layer thickness and the preset error range;
obtaining a target material layer thickness according to the minimum suitable thickness and the maximum suitable thickness;
controlling the opening of an auxiliary door according to the thickness of the target material layer, the thickness of the first material layer and the thickness of the second material layer;
acquiring the width of an auxiliary door, the running speed of a sintering machine and the linear speed of a multi-roller distributor;
obtaining a control material layer thickness according to the standard material layer thickness, the sintering machine running speed and the multi-roller distributing machine linear speed;
acquiring a first average value of the thickness of a control material layer under normal conditions when the opening of the auxiliary door is unchanged for a plurality of times;
calculating the difference value between the real-time value of the material layer thickness and the first average value, and determining the abnormal condition when the difference value is larger than a preset value;
and when the abnormal condition is continued for a period of time and the average material layer thickness is smaller than the first average value, controlling the opening of the auxiliary door to increase until the average value of the material layer thickness is larger than the first average value, and controlling the opening of the auxiliary door to decrease.
2. The sintering machine material layer thickness control system according to claim 1, wherein the specific method for controlling the auxiliary door opening according to the target material layer thickness, the first material layer thickness and the second material layer thickness is as follows:
obtaining a first material volume according to the target material layer thickness and the first material layer thickness;
obtaining a second material volume according to the width of the auxiliary door, the running speed of the sintering machine, the linear speed of the multi-roller distributor, the thickness of the target material layer and the thickness of the second material layer;
and adjusting the opening of the auxiliary door according to the first material volume until the first material volume is equal to the second material volume.
3. The sintering machine bed thickness control system according to claim 2, further comprising, after the step of adjusting the auxiliary door opening according to the first material volume and the second material volume until the first material volume is equal to the second material volume:
and adjusting the opening of the auxiliary door again, and controlling the thickness of the second material layer to be equal to the thickness of the control material layer.
4. A control system for the thickness of a sinter machine material layer as claimed in claim 1, wherein the control material layer thickness is determined according to the following formula:
in the formula, h j To control the layer thickness, H is the standard layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader.
5. A system for controlling the thickness of a layer of a sintering machine according to claim 2, characterized in that the target layer thickness is determined by summing the minimum suitable thickness and the maximum suitable thickness and averaging the values, according to the following formula:
H mid ＝(H min +H max )/2
wherein H is mid To target the material layer thickness H min To minimum proper thickness H max Is the maximum suitable thickness.
6. The system of claim 5, wherein when the first layer thickness is greater than the maximum suitable thickness, indicating that the material is too much before the pressing plate, wherein the excessive material volume is defined as a first material volume, determining that the excessive material volume is:
wherein V is u For excessive material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
7. The system of claim 6, wherein when the first layer thickness is greater than the maximum suitable thickness, the angle of the opening of the auxiliary door is adjusted to decrease the volume of the material after a period of time, and wherein the decreased volume of the material is used as the second volume of the material, the decreased volume of the material is determined as follows:
wherein V is jd For reduced material volume, H is the standard material layer thickness, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader, h t And t is the execution time for the second layer thickness.
8. The system of claim 5, wherein when the first layer thickness is less than the minimum suitable thickness, indicating a missing material before the pressing plate, wherein the missing material volume is defined as a first material volume, and wherein the missing material volume is determined as follows:
wherein V is d For the missing material volume, h i For the first layer thickness, θ is the angle of repose, and l is the minor gate width.
9. The system of claim 8, wherein when the first layer thickness is less than the minimum suitable thickness, the angle of the opening of the auxiliary door is adjusted to increase the volume of the material after a period of time, and wherein the increased volume of the material is used as the second volume of the material, the increased volume of the material is determined as follows:
wherein V is ju For increasing the volume of the material, H is the thickness of the standard material layer, v t For the running speed of the sintering machine trolley v j Is the linear speed of the multi-roller spreader, h t And t is the execution time for the second layer thickness.
10. A sintering machine bed thickness control system according to claim 1, wherein the minimum suitable thickness is equal to the standard bed thickness.
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