Cloth conveying system and belt type roasting machine trolley material thickness control method

Abstract

The invention provides a material distribution conveying system and a belt type roasting machine trolley material thickness control method. In the pellet production process, the green pellet feeding amount is obtained in real time, and N continuous green pellet feeding amounts serve as a first set; judging whether the green pellet feeding amount in the first set meets one-way change or not; if the one-way change is satisfied, determining a green pellet variable quantity relative to a first threshold value in the first set, and judging whether the green pellet variable quantity satisfies a preset adjustment condition or not; if the preset adjusting condition is met, the target opening degree of the grate-layer material valve is determined according to the green ball variable quantity and parameters needed by the valve opening degree; the actual opening degree of the bedding material valve is controlled to be the target opening degree; namely, the influence caused by the unstable green pellet feeding amount can be solved by obtaining the green pellet feeding amount, controlling the actual opening degree of the grate-layer material valve and adjusting the thickness of the grate-layer material, and the quality and production stability of finished pellets are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of belt roasting machines, and more specifically, relates to a material transmission system and a method for controlling the material thickness of a belt roasting machine trolley. Background Art

[0002] In the pellet production process, the belt roaster plays a vital role. The equipment completes the dehydration, heating, oxidation and cooling of the raw balls through a continuous process on the trolley, and finally produces finished balls of qualified quality. The material thickness (composed of the base material and the raw balls) is one of the key factors affecting the quality of the finished balls, and its stability and control accuracy are crucial to ensure product quality.

[0003] At present, the material thickness control of the belt roaster mainly depends on the total amount of material discharged from the mixing bin and the ball formation rate. Due to the fluctuations in the ball formation characteristics of the raw materials, the binder ratio, the water content and other factors, the ball formation rate of the ball making disk will also fluctuate, resulting in an unstable amount of raw balls entering the roaster trolley. This fluctuation is highly random and difficult to control, and has a direct impact on the quality indicators of the finished balls, such as the compressive strength. In order to deal with this problem, the commonly used control method is to adjust the roaster speed.

[0004] However, during the pellet production process, frequent fluctuations in machine speed will lead to inconsistent heating time of different raw balls at different temperatures, which in turn affects the quality of the finished balls. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a material transmission system and a method for controlling the material thickness of a belt roasting machine trolley, which can be used to control the actual opening of the base material valve and adjust the material thickness of the base material by obtaining the amount of raw balls entering the machine.

[0006] The first aspect of the present application discloses a method for controlling the material thickness of a belt roasting machine trolley, comprising:

[0007] In the pelletizing process, the amount of green pellets fed into the machine is obtained in real time, and N consecutive amounts of green pellets fed into the machine are taken as the first set; N is an integer greater than 1;

[0008] Determine whether the amount of raw balls in the first set meets a one-way change; wherein the one-way change means that the magnitude relationship between the amount of raw balls in the first set and the first threshold is the same;

[0009] If the one-way change is satisfied, then determining the amount of change of the raw balls in the first set relative to the first threshold, and judging whether the amount of change of the raw balls satisfies the preset adjustment condition;

[0010] If the preset adjustment conditions are met, the target opening of the valve for laying the bottom material is determined according to the raw ball change amount and the required parameters of the valve opening;

[0011] The actual opening of the base material valve is controlled to be the target opening.

[0012] Optionally, the determining whether the amount of raw balls entering the machine in the first set satisfies a one-way change includes:

[0013] Determine whether the amount of each raw ball input into the machine in the first set is greater than the first threshold, or is less than the first threshold;

[0014] If so, it is determined that the raw ball input in the first set satisfies a one-way change;

[0015] If not, it is determined that the raw ball input quantity in the first set does not satisfy the one-way change.

[0016] Optionally, determining the amount of change of the first set of raw balls relative to the first threshold includes:

[0017] Determine the difference between the amount of each raw ball input in the first set and the first threshold value;

[0018] Each of the differences is processed by average value and absolute value in turn to obtain the amount of change of the raw ball in the first set relative to the first threshold.

[0019] Optionally, the determining whether the amount of change in the raw ball meets a preset adjustment condition includes:

[0020] Determining whether the amount of change of the raw ball is greater than a second threshold;

[0021] If yes, it is determined that the green ball change amount meets the preset adjustment condition;

[0022] If not, it is determined that the raw ball change amount does not meet the preset adjustment conditions.

[0023] Optionally, the parameters required for the valve opening include: raw ball transmission chain parameters, raw ball material thickness corresponding to the first threshold, target material thickness, and a preset relationship table corresponding to the thickness of the bottom material and the valve opening of the bottom material; the target opening of the bottom material valve is determined based on the raw ball change amount and the parameters required for the valve opening, including:

[0024] Determine the green ball change thickness according to the green ball change amount and the green ball transmission chain parameters;

[0025] Determine the current green ball material thickness according to the green ball material thickness change and the green ball material thickness corresponding to the first threshold;

[0026] Determine the currently required thickness of the base material according to the current green ball material thickness and the target material thickness; the target material thickness is the total thickness of the preset green ball material thickness and the base material thickness;

[0027] The target opening of the base material valve is determined based on the currently required base material thickness and the relationship table.

[0028] Optionally, determining the target opening of the bed material valve according to the currently required bed material thickness and the relationship table includes:

[0029] Determine the range to which the currently required thickness of the base material belongs in the relationship table;

[0030] The target opening of the bottom material valve is determined based on the upper limit of the bottom material valve opening, the lower limit of the bottom material valve opening, the upper limit of the bottom material thickness and the lower limit of the bottom material thickness in the range to which the current required bottom material thickness belongs.

[0031] Optionally, determining the green ball change thickness according to the green ball change amount and the green ball transmission chain parameters corresponding to the belt roasting machine trolley includes:

[0032] The ratio of the green ball change amount to the green ball transmission chain parameter corresponding to the belt roasting machine trolley is used as the green ball change thickness, wherein the parameters of the belt roasting machine trolley include: stacking density, trolley width and roasting machine speed.

[0033] Optionally, before controlling the actual opening of the bed material valve to be the target opening, the method further includes:

[0034] The first preset time is delayed based on the collection time of the Nth raw ball input amount in the first set.

[0035] Optionally, the first preset time is the sum of the time required for adjusting the condition determination, the time required for the distributor, the time required for the wide belt and the time required for the roller screen.

[0036] The second aspect of the present application discloses a material distribution and transmission system, including: a pelletizing disc, a receiving belt, a distributor, a wide belt, a roller screen, a bottom material bin, a belt roasting machine trolley, a controller and a bottom material valve;

[0037] The pelletizing disc is connected to the inlet of the distributor via a receiving belt;

[0038] The outlet of the distributor is connected to the inlet of the roller screen through the wide belt;

[0039] The outlet of the roller screen is connected to the green ball material outlet of the belt roasting machine trolley;

[0040] The bottom material bin is connected to the bottom material port of the belt roasting machine trolley via a bottom material valve;

[0041] The receiving belt is provided with a weighing device;

[0042] The output end of the weighing device is connected to the input end of the controller, and the output end of the controller is connected to the control end of the base material valve; the controller is used to execute the control method for the material thickness of the belt roasting machine trolley as described in any one of the first aspects of the present application.

[0043] From the above technical scheme, it can be seen that the present invention provides a method for controlling the material thickness of a belt roasting machine trolley, wherein: in the process of pellet production, the amount of raw balls entering the machine is obtained in real time, and N consecutive amounts of raw balls entering the machine are taken as the first set; it is judged whether the amount of raw balls entering the machine in the first set satisfies a unidirectional change; if it satisfies a unidirectional change, the amount of raw balls changing relative to the first threshold in the first set is determined, and it is judged whether the amount of raw balls changing satisfies a preset adjustment condition; if it satisfies the preset adjustment condition, the target opening of the valve for the base material is determined based on the amount of raw balls changing and the parameters required for the valve opening; the actual opening of the valve for the base material is controlled to be the target opening; that is, by obtaining the amount of raw balls entering the machine, the actual opening of the valve for the base material is controlled, and the material thickness of the base material is adjusted, so as to solve the influence caused by the instability of the amount of raw balls entering the machine; at the same time, it is avoided to use the roasting machine speed adjustment to adapt to the instability of the amount of raw balls entering the machine, and the frequent fluctuations of the machine speed will lead to the problem of inconsistent heating time of different raw balls at different temperatures, thereby affecting the quality of the finished balls, thereby improving the quality of the finished balls and production stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a flow chart of a method for controlling the material thickness of a belt roasting machine trolley provided by an embodiment of the present invention;

[0046] Figure 2 It is a schematic diagram of the change of the amount of green balls fed into the machine involved in a method for controlling the material thickness of a belt roasting machine trolley provided in an embodiment of the present invention;

[0047] Figure 3 It is a flow chart of another method for controlling the material thickness of a belt roasting machine trolley provided by an embodiment of the present invention;

[0048] Figure 4 It is a flow chart of another method for controlling the material thickness of a belt roasting machine trolley provided by an embodiment of the present invention;

[0049] Figure 5 Schematic diagram of a cloth transmission system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the present application, the term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprising one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here, for example.

[0052] The embodiment of the present application provides a method for controlling the material thickness of a belt roasting machine trolley, which is used to solve the problem that in the prior art, the roasting machine speed is adjusted to adapt to the unstable amount of raw balls entering the machine during the pellet production process, and the frequent fluctuations in the machine speed will cause different raw balls to be heated at different temperatures at different times, thereby affecting the quality of the finished balls.

[0053] See also Figure 1 The method for controlling the material thickness of the belt roasting machine trolley includes:

[0054] S101. During the pelletizing process, the amount of green pellets fed into the machine is obtained in real time, and N consecutive amounts of green pellets fed into the machine are taken as the first set.

[0055] N is an integer greater than 1. N can be 60 or other values, which will not be described in detail here. It depends on the actual situation and is within the protection scope of this application.

[0056] The amount of green balls entering the machine refers to the amount of green balls entering the roasting machine trolley; specifically, the amount of green balls entering the machine is the weight of the green balls at the receiving belt in the material transmission system. In other words, the weighing cycle can be set, for example, weighing once per second, that is, the amount of green balls entering the machine is obtained once per second.

[0057] The method of obtaining the information can be to set a weighing device at the receiving belt, which uploads the weighing value in real time, and then the equipment that executes the method of controlling the material thickness of the belt roasting machine trolley can obtain the amount of raw balls entering the machine.

[0058] It should be noted that there may be multiple first sets, each of which includes N consecutive raw ball input quantities, and different first sets may contain the same raw ball input quantity, or the raw ball input quantities in each first set may be data at different times; this is not specifically limited here and may be determined according to the actual situation. In addition, subsequent actions may be performed on each first set.

[0059] S102, determining whether the amount of raw balls entering the machine in the first set satisfies a one-way change.

[0060] Among them, the one-way change is that the magnitude relationship between the amount of each raw ball input into the machine in the first set and the first threshold is the same.

[0061] That is to say, if the raw ball input quantities in the first set are all greater than the first threshold, then it is determined that the raw ball input quantities in the first set satisfy the unidirectional change; the unidirectional change at this time may be a negative unidirectional change; the unidirectional change at this time may be a positive unidirectional change; and, if the raw ball input quantities in the first set are all less than the first threshold, then it is determined that the raw ball input quantities in the first set satisfy the unidirectional change; the unidirectional change at this time may be a negative unidirectional change.

[0062] However, if among the raw ball input quantities in the first set, at least one raw ball input quantity is greater than the first threshold value, and at least one raw ball input quantity is less than the first threshold value, it is determined that the raw ball input quantity in the first set does not satisfy the unidirectional change.

[0063] The first threshold value may be a set target raw ball input amount, and its specific value will not be described in detail here, and it may be determined according to the actual situation.

[0064] Optionally, judging whether the amount of raw balls entering the machine in the first set satisfies a one-way change includes:

[0065] Determine whether the input quantities of each raw ball in the first set are all greater than the first threshold, or are all less than the first threshold.

[0066] If the input quantities of all raw balls in the first set are greater than the first threshold, or are less than the first threshold, it is determined that the input quantities of raw balls in the first set satisfy a unidirectional change.

[0067] If the input amounts of each raw ball are not all greater than the first threshold value, and are not all less than the first threshold value, it is determined that the input amounts of the raw balls in the first set do not satisfy the one-way change.

[0068] Specifically, for the first data point, determine whether it is greater than the first threshold, and record the judgment result (for example, set a Boolean variable to True if it is greater than the first threshold, otherwise False). For subsequent data points, repeat the above judgment, but at this time it is necessary to determine the subsequent judgment logic based on the judgment result of the first data point. If the first data point is greater than the first threshold, then the subsequent data points must also be greater than the first threshold to meet the one-way change condition. If any data point is less than or equal to the first threshold, it is immediately determined that the one-way change is not satisfied, and the loop is exited. If the first data point is less than the first threshold, then the subsequent data points must also be less than the first threshold to meet the one-way change condition. If any data point is greater than or equal to the first threshold, it is also immediately determined that the one-way change is not satisfied, and the loop is exited.

[0069] If after traversing all data points, no violation of the one-way change condition is found, then the raw ball input in the first set is determined to satisfy the one-way change. Otherwise, it is determined that the one-way change is not satisfied.

[0070] It is worth noting that generally, there will not be a situation where N consecutive numbers are equal to the first threshold, and when there is at least one raw ball input equal to the first threshold, the size relationship can be ignored, that is, when the i raw ball inputs are greater than or less than the first threshold, and the j raw ball inputs are equal to the first threshold, it can still be considered to satisfy the unidirectional change. i+j=N.

[0071] If the amount of raw balls entering the machine in the first set satisfies a one-way change, step S103 is executed.

[0072] S103, determining the amount of change of the raw balls in the first set relative to the first threshold, and judging whether the amount of change of the raw balls meets the preset adjustment condition.

[0073] Calculate the difference between the amount of each raw ball input in the first set and the first threshold value. The average absolute value of each difference can be used as the raw ball change amount, or the absolute value of the total value of each difference can be used as the raw ball change amount. Of course, other methods can also be used to determine the change amount, which is not specifically limited here.

[0074] The adjustment condition may be a condition for triggering the adjustment action by the change amount. The preset condition may be a change amount threshold, or other conditions, which are not specifically limited here and may be determined according to the actual situation.

[0075] If the change in the raw ball volume meets the preset adjustment conditions, step S104 is executed.

[0076] S104. Determine the target opening of the base material valve based on the ball raw material change amount and the parameters required for the valve opening. That is, the ball raw material change amount combined with the parameters required for the valve opening can determine the target opening of the base material valve corresponding to the current ball raw material change amount.

[0077] The parameters required for setting the valve opening are the bridge between the raw ball variation and the target opening of the valve for laying the bottom material. The raw ball variation is a numerical value, that is, the variation obtained by taking a first set as a whole.

[0078] According to the ball change and the required parameters of the valve opening, a target opening is calculated using an appropriate algorithm. This calculation process involves the conversion between the change and the thickness, and the conversion between the thickness and the opening.

[0079] The calculated target opening value should be verified to ensure that it is between the maximum and minimum opening of the valve to avoid equipment damage or process abnormalities. If the target opening value is out of range, it needs to be corrected or recalculated.

[0080] Of course, the relationship between the initial opening and the target opening of the bed material valve is used for verification, as well as the direction of change of the raw ball input. When the raw ball input in the first set satisfies the positive unidirectional change, the target opening is greater than the initial opening; when the raw ball input in the first set satisfies the negative unidirectional change, the target opening is less than the initial opening. The initial opening is the opening of the bed material valve when the raw ball input in the first set is equal to the first threshold.

[0081] S105, controlling the actual opening of the base material valve to be the target opening.

[0082] Bottom material valve: refers to the regulating valve for controlling the discharge of the bottom material bin and the roasting machine workshop. The actual opening of the bottom material valve is different, the amount of bottom material discharged is different, and thus the thickness of the bottom material is different.

[0083] Specifically, the bed material valve may be controlled to change at a preset value until the actual opening of the bed material valve reaches the target opening.

[0084] If the actual opening of the current bottom material valve is greater than the target opening, the opening of the bottom material valve will be gradually reduced by a preset value until the actual opening of the bottom material valve reaches the target value.

[0085] If the actual opening of the current bed material valve is less than the target opening, the opening of the bed material valve will be gradually increased by a preset value until the actual opening of the bed material valve reaches the target value.

[0086] If the actual opening of the current bottom material valve is equal to the target opening, the actual opening of the bottom material valve remains unchanged.

[0087] In this embodiment, during the pellet production process, the amount of raw balls entering the machine is obtained in real time, and N consecutive amounts of raw balls entering the machine are taken as the first set; it is determined whether the amount of raw balls entering the machine in the first set satisfies a one-way change; if it satisfies a one-way change, the amount of raw balls changing relative to the first threshold in the first set is determined, and it is determined whether the amount of raw balls changing satisfies a preset adjustment condition; if it satisfies the preset adjustment condition, the target opening of the valve for the base material is determined based on the amount of raw balls changing and the parameters required for the valve opening; the actual opening of the valve for the base material is controlled to be the target opening; that is, by obtaining the amount of raw balls entering the machine, the actual opening of the valve for the base material is controlled, and the thickness of the base material is adjusted to solve the impact of the unstable amount of raw balls entering the machine; at the same time, it is avoided to use the method of adjusting the roasting machine speed to adapt to the unstable amount of raw balls entering the machine, and the frequent fluctuations in the machine speed will lead to inconsistent heating time of different raw balls at different temperatures, thereby affecting the quality of the finished balls, thereby improving the quality of the finished balls and production stability.

[0088] Optionally, determining a change in the number of live balls in the first set relative to a first threshold comprises:

[0089] Firstly, the difference between the amount of each raw ball input in the first set and the first threshold is determined; secondly, each difference is processed by mean and absolute value in turn to obtain the amount of raw ball change in the first set relative to the first threshold.

[0090] For each raw ball input in the first set, a subtraction operation is performed, that is, it is subtracted from the preset first threshold value. The result is the difference between each raw ball input and the first threshold value, and these differences constitute a difference sequence.

[0091] Next, this difference sequence is averaged. The average is done by adding up all the differences and then dividing by the total number of differences to get an average difference. This average difference reflects the overall level of the difference between the raw ball input in the first set and the first threshold.

[0092] After obtaining the average difference, perform an absolute value processing on it. Absolute value processing ensures that no matter whether the average difference is positive or negative, a positive number can be obtained to represent the actual size of the difference (regardless of directionality). The result after absolute value processing is the amount of change in the first set relative to the first threshold.

[0093] Through the above steps, not only can the difference between the amount of raw balls entering the machine in the first set and the first threshold be quantified, but a single value can also be obtained to represent the overall size and trend of this difference. This raw ball change will serve as an important basis for subsequent judgment and decision-making.

[0094] Optionally, judging whether the change amount of the raw ball meets the preset adjustment condition includes:

[0095] Determine whether the change in the raw ball is greater than the second threshold.

[0096] If the raw ball variation is greater than the second threshold, it is determined that the raw ball variation meets the preset adjustment condition.

[0097] If the raw ball variation is not greater than the second threshold, it is determined that the raw ball variation does not meet the preset adjustment condition.

[0098] The second threshold is used as a benchmark for determining whether the amount of change in the raw ball needs to be adjusted; the second threshold can be 4% of the first threshold; of course, it can also be other values, which are not listed here one by one, and can be determined according to the actual situation, all of which are within the scope of protection of this application.

[0099] The green ball variation calculated in the above steps is compared with a preset second threshold.

[0100] If the change in the amount of raw balls is greater than the second threshold, it is determined that the change in the amount of raw balls meets the preset adjustment conditions, which means that the difference between the amount of raw balls entering the machine and the first threshold has reached a level that requires adjustment. According to the control strategy, further operations may be required, such as adjusting the opening of the base material valve, issuing an alarm, or recording relevant information.

[0101] If the change in the amount of raw balls is not greater than the second threshold, it is determined that the change in the amount of raw balls does not meet the preset adjustment conditions. In this case, no action is required and the changing trend of the amount of raw balls entering the machine continues to be monitored.

[0102] Specifically, a target raw ball input (i.e., the first threshold) is set at 500 tons / hour. The actual raw ball input is determined by the total amount of material in the pelletizing disc and the pelletizing effect, where the pelletizing effect is usually evaluated based on experience or data statistics. Assuming that the pelletizing rate is 0.84, the total amount of mixed material required to achieve the target raw ball input can be calculated using the following formula:

[0103] Total amount of mixed material pelletizing = target raw material pelletizing amount / pelletizing rate = 500 / 0.84≈595 tons / hour;

[0104] At the same time, we can also understand this problem from another perspective: the amount of raw balls entering the machine = the total amount of mixed material to make balls × the ball formation rate.

[0105] In the actual production process, the total amount of mixed material pelletizing is pre-set and distributed to each pelletizing disk. However, due to the influence of various factors such as material properties, binder dosage, moisture content of the mixed material, inclination angle of the pelletizing disk, rotation speed and material fluctuation, the pelletizing rate will be different, resulting in fluctuations in the amount of raw pellets entering the machine.

[0106] In order to capture and quantify these fluctuations, a model for quantifying the amount of raw balls entering the machine was established. The model collects data on the amount of raw balls entering the machine once a second and compares it with the target value (i.e., the first threshold). When 60 consecutive data points (i.e., data within one minute) are greater than or less than the target value, the average of these 60 data points is calculated. If the absolute difference between the average and the target value exceeds 4% of the target value (i.e., the second threshold), it is considered that there is a significant fluctuation, and the model will record the average value of the fluctuation and the time when it occurs.

[0107] Take the change of raw ball feeding amount in a pelletizing plant during a certain period as an example. Figure 2 The diagram shows the change of the amount of raw balls entering the machine during this period. The figure uses numbers 1 to 10 to mark different states of material change. In states 2, 9, and 10, the fluctuation is small and fluctuates around the target value, so the model does not mark it. In states 1, 3, 4, 5, 6, 7, and 8, the model starts recording because the one-way condition is met (that is, 60 consecutive data points deviate from the target value). Further analysis shows that the fluctuations in states 3, 4, 5, and 7 are small, so no adjustment is required. The fluctuations in states 1, 6, and 8 are large, and the model will control these fluctuations accordingly.

[0108] It is worth noting that when the volatility is positive, such as Figure 2 Parts 6 and 8 in the data indicate that the ball-making effect is good and there are many qualified balls. For example, the average fluctuation value of part 6 is 26, and the average fluctuation value of part 8 is 30, both indicating that the amount of raw balls fed into the machine exceeds the target value. The average fluctuation value of part 1 is -21, indicating that the amount of raw balls fed into the machine is lower than the target value. Through these data, we can more accurately understand the fluctuations in the production process and take corresponding control measures to ensure production stability and product quality.

[0109] Optionally, the parameters required for the valve opening include: raw ball transmission chain parameters, raw ball material thickness corresponding to the first threshold, target material thickness, and a preset relationship table corresponding to the thickness of the bed material and the valve opening of the bed material; determining the target opening of the bed material valve according to the raw ball change amount and the parameters required for the valve opening includes:

[0110] Firstly, the change thickness of the green ball is determined according to the change amount of the green ball and the parameters of the green ball transmission chain; secondly, the current green ball material thickness is determined according to the change thickness of the green ball and the green ball material thickness corresponding to the first threshold; then, the current required base material thickness is determined according to the current green ball material thickness and the target material thickness; the target material thickness is the total thickness of the preset green ball material thickness and the base material thickness; finally, the target opening of the base material valve is determined according to the current required base material thickness and the relationship table.

[0111] Material thickness on the trolley: refers to the thickness of the pellets on the trolley, including the thickness of the finished balls of the base material and the thickness of the raw balls to be processed. They are placed in layers, with the base material on the lower layer and the raw balls on the upper layer.

[0112] Specifically, the parameters required for the valve opening are obtained. The parameters of the raw ball transmission chain include the speed and length of the transmission chain, which will affect the distribution and accumulation of raw balls during the transmission process. The raw ball material thickness corresponding to the first threshold: the thickness of the raw ball material when the amount of raw balls input into the machine of the first set is the first threshold, and the first threshold and its raw ball material thickness are used as the benchmark. Target material thickness: The total thickness of the preset raw ball material and base material is the final material layer thickness expected to be achieved. The correspondence table of the preset base material thickness and base material valve opening: This is a pre-established table used to quickly find the corresponding valve opening according to the required base material thickness.

[0113] Based on the green ball change amount (i.e. the difference between the amount of green balls entering the machine and the first threshold, a single value obtained after processing) and the green ball transmission chain parameters, the change in the green ball material layer thickness caused by the green ball change amount, i.e. the green ball change thickness, is calculated through a certain mathematical model or empirical formula.

[0114] The calculated green ball thickness change is added to the green ball thickness corresponding to the first threshold to obtain the current green ball thickness. If the green ball thickness change is a negative value, it means that the green ball material layer is thinning; if it is a positive value, it means that the green ball material layer is thickening.

[0115] According to the target material thickness and the currently determined green ball material thickness, the currently required base material thickness is obtained by subtraction. This is the thickness of the base material that needs to be added in order to achieve the target material thickness.

[0116] Use the preset corresponding relationship table between the thickness of the bed material and the valve opening of the bed material to quickly find the corresponding valve opening according to the current required bed material thickness. This step is usually implemented by interpolation calculation or table lookup method to ensure that the target opening value can be obtained quickly and accurately.

[0117] Through the above steps, the target opening of the base material valve can be accurately determined according to the change in raw ball volume and a series of related parameters, thereby achieving effective control of the total thickness of raw ball material and base material. This process requires comprehensive consideration of multiple factors and relies on accurate mathematical models and preset parameter tables to ensure the accuracy and stability of control.

[0118] Optionally, the target opening of the bed material valve is determined based on the currently required bed material thickness and the relationship table, including:

[0119] First, determine the range of the currently required bottom material thickness in the relationship table; second, determine the target opening of the bottom material valve based on the upper limit of the bottom material valve opening, the lower limit of the bottom material valve opening, the upper limit of the bottom material thickness and the lower limit of the bottom material thickness in the currently required bottom material thickness and the range to which it belongs.

[0120] Look up the preset relationship table between the thickness of the bed material and the opening of the bed material valve, and find the two data points closest to the currently required bed material thickness. These two data points correspond to the upper and lower limits of a bed material thickness range in the relationship table, and the upper and lower limits of the corresponding bed material valve opening.

[0121] According to the found range of the thickness of the bed material and its corresponding range of the valve opening, the valve opening corresponding to the currently required bed material thickness is calculated by using linear interpolation or other appropriate mathematical methods.

[0122] It should be noted that the particularity of the bed material position leads to many difficulties in installing a device for detecting the material thickness. Therefore, in the actual production process, field measurements can usually only be carried out before the furnace is put into production to determine the bed material thickness corresponding to different valve openings. The following table shows the corresponding relationship between the opening of the bed material valve and the bed material thickness measured by a pelletizing plant before production.

[0123] Serial number n Thickness of base material x (mm) Opening degree y (%) 1 80 0 2 100 5.8 3 150 21.8 4 200 36.9 5 250 50 6 300 63.3 7 350 77.3 8 400 91.6 9 430 100

[0124] According to the above table, an approximate piecewise function of the thickness of the base material and the opening of the base material valve is established. When x is the thickness and y is the angle, the piecewise function is as follows:

[0125] Y=y n-1 +(xx n-1 )*(y n -y n-1 ) / (x n -x n-1 );

[0126] Here, n is an integer from 1 to 9.

[0127] That is, when it is determined that the current required base material thickness is within the range in the relationship table, the above formula can be added to obtain the target opening; where Y is the target opening, y n The thickness of the bed material currently required and the upper limit of its range are the bed material valve opening degrees; y n-1 is the bottom material thickness currently required and the bottom material valve opening of the lower limit of its range; x is the bottom material thickness currently required; x n The thickness of the backing material is the upper limit of the range of the thickness of the backing material currently required; x n-1 The base material thickness is the lower limit of the range to which the currently required base material thickness belongs.

[0128] Specifically, when the current required thickness of the base material is 240mm, first determine that 240mm is between 200mm-250mm, then the corresponding target opening must be between 36.9-50, and then use the above formula to calculate.

[0129] Y=36.9+(240-200)*(50-36.9) / (250-200)=47.4(%);

[0130] Through the above steps, the target opening of the base material valve can be determined more accurately, thereby achieving effective control of the total thickness of the raw ball material and the base material. This process requires accurate mathematical models, preset parameter tables and sophisticated interpolation calculations to ensure the accuracy and stability of control.

[0131] Optionally, the green ball thickness variation is determined based on the green ball variation and the green ball transmission chain parameters corresponding to the belt roasting machine trolley, including:

[0132] The ratio of the green ball change amount to the green ball transmission chain parameters corresponding to the belt roasting machine trolley is taken as the green ball change thickness, where the parameters of the belt roasting machine trolley include: stacking density, trolley width and roasting machine speed.

[0133] Belt roaster trolley: This is the equipment used to transport and roast green balls. Its parameters include bulk density, trolley width and roaster speed.

[0134] Bulk density: the mass or quantity of green balls per unit volume.

[0135] Trolley width: The horizontal width of the trolley used to place green balls.

[0136] Roasting machine speed: the speed at which the trolley (and the raw balls on it) are transported on the roasting machine.

[0137] The thickness of the raw ball can be regarded as the "thickness difference" formed on the trolley due to the change of the raw ball per unit time. In order to calculate this thickness, it is necessary to convert the raw ball change into the "equivalent thickness" in the width direction of the trolley.

[0138] In pellet production, the total material thickness is the target material thickness during design. If it is 430mm, the roasting time of green balls is 40 minutes, and the total length of the roasting machine is 132m, then the roasting machine speed is:

[0139] Roasting machine speed = roasting machine length / roasting time = 132 / 40 = 3.3 (m / min);

[0140] Assuming that the raw ball feeding rate is 500t / h, the trolley width is 4m, and the pellet density is 2.2t / m3, the raw ball thickness is:

[0141] Green ball thickness = 1000*green ball feeding amount / (stacking density*trolley width*roasting machine speed*60);

[0142] =1000*500 / (2.2*4*3.3*60)=287 (mm).

[0143] Green ball thickness change = 1000*green ball change amount / (bulk density*trolley width*roasting machine speed*60);

[0144] That is, the thickness of the raw ball of part 1 = 1000*(-21) / (2.2*4*3.3*60)=-12 (mm);

[0145] The thickness of the raw ball of part 6 = 1000*26 / (2.2*4*3.3*60) = 15 (mm);

[0146] The thickness of the raw ball in part 8 = 1000*30 / (2.2*4*3.3*60) = 17 (mm);

[0147] That is, the change in the green balls in parts 1, 6, and 8 affects the thickness of the green balls on the trolley to -12mm, 15mm, and 17mm respectively.

[0148] like Figure 3 As shown, optionally, before controlling the actual opening of the bed material valve to be the target opening, the method further includes:

[0149] S201, delaying a first preset time based on the collection time of the Nth amount of green balls entering the machine.

[0150] That is, after the collection moment of the Nth amount of raw balls entering the machine is delayed by the first preset time, the step of controlling the actual opening of the base material valve to be the target opening is executed.

[0151] Record the collection time of the Nth green ball quantity in the first set. It can be recorded at the collection time. The specific recording process will not be repeated here one by one. It depends on the actual situation and is within the protection scope of this application.

[0152] The first preset delay time may also be set at other locations, such as Figure 1 Any position in; it can also be a delay before executing the method of the present application, for example, real-time collection of raw ball input, and after the Nth raw ball input delay for a first preset time, then execute the following Figure 1 The process shown; the delay setting position will not be described here one by one, and all are within the scope of protection of this application.

[0153] It should be noted that the amount of raw balls entering the machine is detected at the end of the receiving belt and needs to pass through the distributor, wide belt and roller screen to reach the trolley of the roasting machine. Therefore, the opening of the bottom material valve can be controlled after a delay of the first preset time.

[0154] Optionally, the first preset time is the sum of the time required for determining the adjustment conditions, the time required for the distributor, the time required for the wide belt, and the time required for the roller screen.

[0155] On the production line, the amount of raw balls entering the machine is collected in real time through sensors or measuring equipment.

[0156] When the Nth raw ball input in the first set is collected, the collection time is recorded and marked as T1.

[0157] Determine the first preset time, which includes the sum of the time required for adjusting condition determination, the time required for the distributor, the time required for the wide belt, and the time required for the roller screen. That is, the delay time t = the fluctuation determination time (the time required for adjusting condition determination) + the distributor time (the time required for the distributor) + the wide belt time (the time required for the wide belt) + the roller screen time (the time required for the roller screen). Add these times to get the first preset time, which is recorded as T2.

[0158] Adjustment condition determination time: the time to determine whether the valve opening needs to be adjusted based on the change in raw balls and other related parameters. Distributor time: the time it takes for the distributor to evenly distribute the raw balls on the trolley. Wide belt time: the time it takes for the raw balls to be transferred from the distributor to the roller screen. Roller screen time: the time it takes for the roller screen to screen and sort the raw balls.

[0159] Among them, the fluctuation judgment delay time can be 60 seconds; distributor time = 2* (distributor end distance - start distance) / distributor speed; because it is a reciprocating distributor, the distance in the formula is twice the distance traveled by the distributor. Wide belt time = wide belt length / wide belt speed; both the wide belt and the distributor are adjustable speed equipment; the roller screen time is determined by the cage throwing experiment at the production site. The cage throwing time at a pellet production site is 34 seconds. The roller screen time is a relatively fixed parameter, which needs to be determined by cage throwing tests at different sites. Once determined, this parameter will not change.

[0160] Execute the steps of controlling the actual opening of the valve for laying the bottom material to be the target opening: after the delay time is over, adjust the actual opening of the valve for laying the bottom material according to the target opening of the valve for laying the bottom material calculated previously. Ensure that the adjustment of the valve opening is coordinated with the raw ball transmission and material distribution process on the production line to achieve precise control.

[0161] The execution time, target opening, actual opening and any related abnormal conditions of each control operation can be recorded. Reports can also be generated regularly to analyze the control effect and optimize the control strategy.

[0162] In other words, the material thickness control method of the belt roasting machine trolley is a feedforward control method, that is, to capture the change of the amount of raw balls entering the machine in advance, and calculate the delay time through the process flow, and finally control the change of the disturbance amount, and reduce the interference of the disturbance amount on the system. It includes material distribution calculation, quantification of the amount of raw balls entering the machine, the corresponding thickness of the fluctuation amount, soft instrument measurement of the valve opening and thickness of the bottom material, calculation of the delay time of the raw balls entering the machine to the trolley, and intelligent automatic control of the material thickness of the trolley.

[0163] In this embodiment, a mathematical model is used to conduct a scientific quantitative analysis of the amount of raw balls entering the machine, and its fluctuation and its influence on the material thickness of the trolley are accurately calculated. At the same time, combined with the running speed of the conveying equipment, the delay time from the entry of the raw balls into the machine to their arrival at the roasting machine trolley can be accurately calculated. On this basis, soft instrument technology is used to deeply explore the intrinsic connection between the valve opening of the bottom material and the material thickness. Through this series of technical means, it is possible to achieve precise control of the valve opening of the bottom material, and then effectively regulate the material thickness of the bottom material. Finally, by controlling the material thickness of the bottom material, the goal of controlling the material thickness of the roasting machine trolley is achieved, and the intelligent control of the valve opening of the bottom material and the material thickness of the roasting machine trolley is realized, and unmanned automatic control is realized, which solves the problem of heavy reliance on manual operation; this process not only improves the accuracy of control, but also ensures the stability of the production process and the consistency of product quality.

[0164] It is worth noting that the current technology mainly relies on the production experience of the operator to manually adjust the opening of the valve for the base material, which is fraught with many challenges. Specifically, the changing pattern of the amount of raw balls entering the machine is complex and changeable, making it difficult to accurately quantify manually; the delay time from the raw balls entering the machine to the arrival of the trolley is affected by the speed of the transmission equipment and is also difficult to accurately measure; the corresponding relationship between the fluctuating material amount and the material thickness, as well as the correlation between the opening of the base material valve and the material thickness, are also difficult to quantify manually. In addition, the control effect also depends largely on the experience and sense of responsibility of the operator, which further increases the uncertainty of the control process.

[0165] In view of the above problems, this embodiment proposes an innovative method for controlling the thickness of the material of the belt roasting machine trolley. This method successfully solves the technical bottlenecks in measurement and quantification, realizes intelligent automatic control, and effectively replaces the traditional manual operation method. Through this method, the material thickness of the trolley can be controlled more accurately and stably, providing strong support for the optimization of the production process and the improvement of product quality.

[0166] See also Figure 4 , an example is given to illustrate the material thickness control method of the belt roasting machine trolley:

[0167] 1. During the production process, the value of the amount of raw balls entering the machine is automatically collected.

[0168] 2. Determine the amount of raw balls entering the machine.

[0169] 3. If no unidirectional change is observed, the current valve position is maintained and subsequent judgments are continued.

[0170] 4. When a unidirectional change occurs, further distinguish whether it is a positive change or a reverse change.

[0171] 5. If the change is positive and the amount of change is small (the adjustment conditions are not met), maintain the valve position unchanged and continue monitoring.

[0172] 6. If the change is positive and the amount of change is large (adjustment is required), record the amount of change and the time of change.

[0173] 7. If the change is in the opposite direction and the amount of change is small (the adjustment conditions are not met), keep the valve position unchanged and continue to observe.

[0174] 8. If the change is in the opposite direction and the amount of change is large (adjustment is required), record the amount of change and the time of change.

[0175] 9. When the conditions of Article 6 or 8 above are met, the change in green ball material is converted into the change in green ball material thickness and added to the green ball material thickness when it is unchanged to obtain the actual green ball material thickness (positive change is recorded as a positive number, and negative change is recorded as a negative number).

[0176] 10. Calculate the required thickness of the base material by subtracting the actual raw ball material thickness from the target material thickness.

[0177] 11. The opening of the bottom material valve is determined by using soft instrument technology (i.e., the technology of the relationship table between the thickness of the bottom material and the opening of the bottom material valve determined by the present invention).

[0178] 12. According to the delay calculation method provided by the present invention, the delay time for adjusting the opening of the base material valve is determined, and then the valve opening is adjusted to the set value.

[0179] 13. After the adjustment is completed, start the next round of judgment and control process.

[0180] In other words, the quantitative model of raw ball input can accurately capture the significant changes in the raw ball input, and solves the problem that traditional PID control cannot achieve automatic control through innovative soft instrument measurement technology, thus replacing manual control.

[0181] In addition, the control method of the material thickness of the belt roasting machine trolley can be integrated into the quantitative model of the amount of raw balls entering the machine and directly called when needed. By monitoring the change pattern of the amount of raw balls entering the machine, if there is no unidirectional change, the process continues; once a unidirectional change occurs, whether it is forward or reverse, it is necessary to judge the size of the change. If the change is small (less than 4% of the target value), the process ends; if the change is large (greater than 4% of the target value), the increment or decrement value and the change time are recorded, and the change is converted into a change in the thickness of the raw balls, and then the actual thickness of the base material is calculated. Subsequently, the soft instrument measurement technology is used to determine the opening of the base material valve, and the adjustment action is performed after a delay to achieve the required valve opening.

[0182] Another embodiment of the present application provides a cloth transmission system.

[0183] See also Figure 5 The material distribution and transmission system includes: a pelletizing disk, a receiving belt, a distributor, a wide belt, a roller screen, a bottom material bin, a belt roasting machine trolley, a controller and a bottom material valve.

[0184] The pelletizing disc is connected to the inlet of the distributor through a receiving belt.

[0185] The outlet of the distributor is connected to the inlet of the roller screen through a wide belt.

[0186] The outlet of the roller screen is connected to the raw ball material outlet of the belt roasting machine trolley.

[0187] The bottom material bin is connected with the bottom material opening of the belt roasting machine trolley through a bottom material valve.

[0188] The receiving belt is provided with a weighing device.

[0189] The output end of the weighing device is connected to the input end of the controller, and the output end of the controller is connected to the control end of the bottom material valve; the controller is used to execute the control method for the thickness of the material of the belt roasting machine trolley; the control process and principle of the control method for the thickness of the material of the belt roasting machine trolley, please refer to the control method for the thickness of the material of the belt roasting machine trolley provided in the above embodiment for details, which will not be repeated here.

[0190] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0191] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0192] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the material thickness of a belt roasting machine trolley, characterized in that: include: In the pelletizing process, the amount of green pellets fed into the machine is obtained in real time, and N consecutive amounts of green pellets fed into the machine are taken as the first set; N is an integer greater than 1; Determine whether the amount of raw balls in the first set meets a one-way change; wherein the one-way change means that the magnitude relationship between the amount of raw balls in the first set and the first threshold is the same; If the one-way change is satisfied, then determining the amount of change of the raw balls in the first set relative to the first threshold, and judging whether the amount of change of the raw balls satisfies the preset adjustment condition; If the preset adjustment conditions are met, the target opening of the valve for laying the bottom material is determined according to the raw ball change amount and the required parameters of the valve opening; The actual opening of the base material valve is controlled to be the target opening.

2. The method for controlling the material thickness of a belt roasting machine trolley according to claim 1, characterized in that: The step of judging whether the amount of raw balls in the first set meets the requirement of one-way change includes: Determine whether the amount of each raw ball input into the machine in the first set is greater than the first threshold, or is less than the first threshold; If so, it is determined that the raw ball input in the first set satisfies a one-way change; If not, it is determined that the raw ball input quantity in the first set does not satisfy the one-way change.

3. The method for controlling the material thickness of a belt roasting machine trolley according to claim 1, characterized in that: Determining a change in the first set of raw balls relative to the first threshold comprises: Determine the difference between the amount of each raw ball input in the first set and the first threshold value; Each of the differences is processed by average value and absolute value in turn to obtain the amount of change of the raw ball in the first set relative to the first threshold.

4. The method for controlling the material thickness of a belt roasting machine carriage according to claim 1, characterized in that: The step of judging whether the change amount of the raw ball meets the preset adjustment condition includes: Determining whether the amount of change of the raw ball is greater than a second threshold; If yes, it is determined that the green ball change amount meets the preset adjustment condition; If not, it is determined that the raw ball change amount does not meet the preset adjustment conditions.

5. The method for controlling the material thickness of a belt roasting machine carriage according to claim 1, characterized in that: The parameters required for the valve opening include: raw ball transmission chain parameters, raw ball material thickness corresponding to the first threshold, target material thickness, and a preset relationship table corresponding to the thickness of the base material and the valve opening of the base material; the target opening of the base material valve is determined based on the raw ball change amount and the parameters required for the valve opening, including: Determine the green ball change thickness according to the green ball change amount and the green ball transmission chain parameters; Determine the current green ball material thickness according to the green ball material thickness change and the green ball material thickness corresponding to the first threshold; Determine the currently required thickness of the base material according to the current green ball material thickness and the target material thickness; the target material thickness is the total thickness of the preset green ball material thickness and the base material thickness; The target opening of the base material valve is determined based on the currently required base material thickness and the relationship table.

6. The method for controlling the material thickness of a belt roasting machine carriage according to claim 5, characterized in that: Determining the target opening of the bed material valve according to the currently required bed material thickness and the relationship table includes: Determine the range to which the currently required thickness of the base material belongs in the relationship table; The target opening of the bottom material valve is determined based on the upper limit of the bottom material valve opening, the lower limit of the bottom material valve opening, the upper limit of the bottom material thickness and the lower limit of the bottom material thickness in the range to which the current required bottom material thickness belongs.

7. The method for controlling the material thickness of a belt roasting machine carriage according to claim 5, characterized in that: Determining the green ball change thickness according to the green ball change amount and the green ball transmission chain parameters corresponding to the belt roasting machine trolley includes: The ratio of the green ball change amount to the green ball transmission chain parameter corresponding to the belt roasting machine trolley is used as the green ball change thickness, wherein the parameters of the belt roasting machine trolley include: stacking density, trolley width and roasting machine speed.

8. The method for controlling the material thickness of a belt roasting machine carriage according to claim 1, characterized in that: Before controlling the actual opening of the bed material valve to be the target opening, the method further includes: The first preset time is delayed based on the collection time of the Nth raw ball input amount in the first set.

9. The method for controlling the material thickness of a belt roasting machine carriage according to claim 8, characterized in that: The first preset time is the sum of the time required for adjusting condition determination, the time required for the distributor, the time required for the wide belt and the time required for the roller screen.

10. A cloth transmission system, characterized in that: include: Pelletizing disc, receiving belt, distributor, wide belt, roller screen, bottom material bin, belt roasting machine trolley, controller and bottom material valve; The pelletizing disc is connected to the inlet of the distributor via a receiving belt; The outlet of the distributor is connected to the inlet of the roller screen through the wide belt; The outlet of the roller screen is connected to the green ball material outlet of the belt roasting machine trolley; The bottom material bin is connected to the bottom material port of the belt roasting machine trolley via a bottom material valve; The receiving belt is provided with a weighing device; The output end of the weighing device is connected to the input end of the controller, and the output end of the controller is connected to the control end of the base material valve; the controller is used to execute the control method for the material thickness of the belt roasting machine trolley as described in any one of claims 1-9.

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