Automatic warehousing, weighing and supplementing control method and system for grate-layer material of belt type sintering machine

Abstract

The invention provides a belt type sintering machine grate-layer material automatic warehousing and weighing supplementing control method and system, and the method comprises the steps: continuously obtaining the real-time weight data of the grate-layer material in each storage bin based on weighing sensors installed at the bearing supporting points of at least two parallel grate-layer material storage bins, carrying out the anti-interference processing of the real-time weight data, and obtaining the real-time weight data of the grate-layer material in each storage bin; signal fluctuation caused by field working conditions is eliminated; by taking the real-time weight data subjected to anti-interference processing as a unique decision basis for material supplementing control, comparing the real-time weight data with a preset material supplementing weight lower limit, automatically judging a target material supplementing bin, and controlling a material distributing device to switch a grate-layer material conveying path to the target material supplementing bin; and in the process of supplementing materials to the target material supplementing bin, the operation state of a material supplementing execution mechanism is continuously adjusted in a closed-loop mode with the real-time weight data subjected to anti-interference processing as the feedback quantity, material supplementing is stopped till the real-time weight data reach a preset material supplementing target value, and the material supplementing target value is lower than the physical capacity limit of the material storage bin.

Description

Technical Field

[0001] This invention belongs to the field of automation control technology for metallurgical sintering production, specifically relating to a method and system for automatic feeding and weighing of bottom material into a belt sintering machine. Background Technology

[0002] The belt sintering machine is the core equipment in the modern iron and steel metallurgical sintering process. The continuity, stability, and quality of sintering production directly determine the raw material supply efficiency, smelting stability, and overall energy consumption level of the subsequent blast furnace ironmaking process. The bottom material laying system, as a key component of the sintering machine trolley material laying process, is an important foundation for ensuring the smooth operation of the entire sintering production process. Before the sintering machine trolley starts running, the bottom material is evenly laid on the trolley grate to form a material layer of a certain thickness. Then, the mixture to be sintered is laid on the bottom material. During the subsequent ignition and blast sintering process, the bottom material is always between the mixture layer and the trolley grate, serving as a crucial buffer barrier between the high-temperature sintering zone and the equipment body.

[0003] The base material is typically sintered ore separated from the sintered finished product screening system within a specific particle size range. The industry generally requires its particle size to be controlled at around 10-18mm, with a stable laying thickness of 45-50mm on the sintering trolley. Appropriate base material particle size and stable laying thickness not only effectively improve the overall permeability of the sintering layer, allowing the exhaust airflow during sintering to pass through the layer more evenly, promoting the mineralization process of the sintered ore, and increasing sintering speed, firing rate, and production efficiency, but also avoids adversely affecting the core metallurgical properties of the sintered ore, such as its reducibility, low-temperature reduction pulverization, and softening properties. With the widespread adoption of high-layer sintering technology in the modern steel industry, the thickness of the sintering layer continues to increase, the high-temperature zone in the sintering process lasts longer, and the maximum operating temperature is higher. This places more stringent requirements on the protective performance, supply continuity, and laying uniformity of the base material. Fluctuations or interruptions in the supply of the base material can directly trigger a series of production and equipment problems.

[0004] A stable and qualified base material plays a crucial role in several key aspects. Firstly, it protects the core sintering equipment, effectively preventing the high-temperature sintering zone from directly contacting the trolley grate bars. This avoids deformation and burning of the grate bars due to long-term high-temperature erosion, significantly extending their service life. Simultaneously, it prevents fine powder from the mixture from entering the main exhaust system with the airflow, reducing the scouring and wear on the exhaust fan rotor and extending the service life of the core components of the exhaust fan. Secondly, it optimizes and improves the sintering process, effectively preventing fine powder from being drawn away through the grate gaps, reducing the dust content in the sintering exhaust gas and the operating load of the downstream dust removal system. This process avoids clogging and adhesion of fine powder and molten sinter to the grate bars, ensuring a stable effective ventilation area and uniform airflow distribution within the sintering material layer. This guarantees a stable and controllable sintering process. The porous structure formed by the coarse-particle bottom material further enhances the airflow permeability of the sintering material layer, promoting efficient and stable sintering. In addition, it significantly improves on-site working conditions. The stable bottom material can essentially eliminate material adhesion to the grate bars of the trolley, reducing material spillage during trolley operation. There is no need to assign dedicated personnel for grate bar cleaning, which improves the on-site working environment and significantly reduces the labor intensity of on-site operators.

[0005] In actual industrial production, the stable supply of base material is highly dependent on the material level control and replenishment control of the storage silo. At present, most sintering production lines in the industry use traditional contact level switches, ultrasonic level gauges, radar level gauges and other detection methods to monitor the material level in the base material storage silo. In the harsh working environment of high dust, high vibration and high temperature radiation in the sintering production site, these detection methods are prone to problems such as signal drift, detection distortion and false triggering. They cannot accurately and continuously reflect the actual material inventory in the storage silo, and it is difficult to achieve accurate automatic control of the replenishment process. Most production lines still rely on on-site operators to manually monitor material levels, manually switch feeding paths, and start / stop replenishment equipment throughout the entire process. This not only significantly increases the labor intensity of operators, but also makes it easy for production accidents such as material overflow and material interruption to occur due to the lag in manual operation and visual misjudgment. Material overflow not only causes material waste and increases the workload of on-site cleanup, but in severe cases, it can also block the conveying equipment and cause equipment failure. Material interruption will directly lead to the interruption of the trolley laying of the bottom material, disrupting the continuity of sintering production and adversely affecting the quality of sintered products and equipment safety. Summary of the Invention

[0006] To address the shortcomings and deficiencies of existing technologies, this invention provides an automatic feeding and weighing replenishment control method and system for bottom material in belt sintering machines. It addresses common industry problems in existing bottom material storage and feeding systems, such as susceptibility to interference from high dust and vibration conditions, insufficient detection accuracy, low automation, high reliance on manual labor, susceptibility to spillage and material shortages, and fragmented control logic preventing comprehensive process coordination. This invention uses high-precision continuous weighing data from the bottom material storage silos as the core control basis, constructing a fully automated control system covering feeding control, path switching, replenishment adjustment, and safety protection. By installing weighing sensors at all load-bearing support points of each parallel bottom material storage silo, continuous real-time acquisition of the bottom material inventory is achieved. Furthermore, composite filtering is used to optimize the collected weight data against interference, eliminating the problems inherent in existing systems. This invention mitigates signal fluctuations caused by field conditions, ensuring stable and reliable weight data. Using anti-interference processed weight data as the sole decision-making basis for replenishment control, it automatically determines the target replenishment bin for multiple storage bins and automatically switches the feeding path. Combined with interlocking and anti-frequent switching protection of the distribution mechanism, it achieves coordinated and orderly replenishment across multiple bins. During replenishment, the invention uses real-time weight data as feedback to adjust the operating status of the replenishment actuator in a closed loop. Through a variable-speed replenishment mode, it achieves rapid and precise control of the replenishment process. Simultaneously, it features closed-loop stable control of the feed flow rate and dual hardware and software anti-overflow redundancy protection, completely replacing the traditional manual operation mode. This enables unmanned, precise, and stable operation of the entire process from bottom material entry to replenishment, effectively avoiding the risks of overflow and material shortage, ensuring a continuous and stable supply of bottom material. It is widely adaptable to the construction and renovation of bottom material systems for various specifications of belt sintering machines.

[0007] The specific technical solution adopted by this invention to solve its technical problem is as follows:

[0008] An automatic feeding and weighing control method for bottom material in a belt sintering machine is provided. Based on the weighing sensors installed at each load-bearing support point of at least two parallel bottom material storage bins, the real-time weight data of the bottom material in each storage bin is continuously acquired. The real-time weight data is subjected to anti-interference processing to eliminate signal fluctuations caused by on-site working conditions.

[0009] Using the real-time weight data after anti-interference processing as the sole decision basis for replenishment control, the real-time weight data is compared with the preset replenishment weight lower limit to automatically determine the target replenishment bin and control the material distribution device to switch the bottom material conveying path to the target replenishment bin.

[0010] During the replenishment process to the target replenishment bin, the operating status of the replenishment actuator is continuously adjusted in a closed loop using the real-time weight data after anti-interference processing as feedback, until the real-time weight data reaches the preset replenishment target value and the replenishment stops. The replenishment target value is lower than the physical capacity limit of the storage bin.

[0011] Furthermore, the anti-interference processing performed on the real-time weight data is a composite filtering process. First, the amplitude limiting filter is used to remove abnormal weight data caused by material impact and equipment vibration. Then, the effective weight data after amplitude limiting filter is smoothed by the moving average filter.

[0012] Furthermore, when the real-time weight data of two or more storage bins are all lower than the preset replenishment weight limit, the replenishment of the target replenishment bin is determined and executed in sequence according to the preset replenishment priority order of storage bins or the order of real-time weight data from low to high; when controlling the material distribution device to switch the conveying path, each outlet of the material distribution device executes the mutual exclusion output logic, and only one outlet is connected under any working condition, and the switching action must be performed after the previous replenishment process has completely stopped, the corresponding replenishment execution mechanism has stopped, and the bottom material in the conveying path has been emptied, and the time interval between the two switching actions is not less than the preset minimum switching time interval.

[0013] Furthermore, the closed-loop control of the operation status of the feeding actuator is as follows: a feeding proximity threshold below the feeding target value is preset; when the difference between the real-time weight data of the target feeding bin and the feeding target value is greater than the feeding proximity threshold, the feeding actuator is controlled to operate in high-speed mode; when the real-time weight data of the target feeding bin reaches the feeding proximity threshold, the feeding actuator is controlled to switch to low-speed mode.

[0014] Furthermore, during the replenishment process, closed-loop control of the feed flow rate is implemented. The actual feed amount of the bottom material conveyor belt is obtained in real time, compared with the preset feed flow rate setting value, and the opening of the feed gate is automatically adjusted to keep the actual feed amount stable within the feed flow rate setting value range. A replenishment weight limit higher than the replenishment target value is preset. When the real-time weight data of the storage bin reaches the replenishment weight limit, an emergency stop command is immediately triggered to stop the operation of the corresponding equipment. At the same time, the main power supply of the corresponding replenishment actuator is cut off through a hard-wired emergency stop signal circuit independent of the control process.

[0015] Furthermore, an automatic feeding and weighing replenishment control system for bottom material in a belt sintering machine includes at least two parallel bottom material storage bins, a material distribution device, a replenishment execution mechanism, and a controller; each load-bearing support point of each set of storage bins is equipped with a weighing sensor connected to the controller; the material distribution device is used to switch the conveying path of the bottom material to any of the storage bins; the replenishment execution mechanism is configured correspondingly to each storage bin; and the controller is connected to each weighing sensor, material distribution device, and replenishment execution mechanism.

[0016] The controller is configured to: receive weight signals from each weighing sensor and perform anti-interference processing to obtain real-time weight data for each storage bin; use the anti-interference processed real-time weight data as the sole decision basis for replenishment control, compare the real-time weight data with a preset replenishment weight lower limit, automatically determine the target replenishment bin, and control the dispensing device to switch to the corresponding conveying path; control the replenishment actuator to replenish the target replenishment bin, and continuously adjust its operating state in a closed loop using the real-time weight data of the target replenishment bin as feedback during the replenishment process, until the real-time weight data reaches a preset replenishment target value, at which point it controls the replenishment to stop, and the replenishment target value is lower than the physical capacity limit of the storage bin.

[0017] Furthermore, the controller has a built-in composite filtering processing unit, which is configured to: firstly, remove abnormal weight data caused by material impact and equipment vibration through amplitude limiting filtering, and then smooth the effective weight data after amplitude limiting filtering through moving average filtering.

[0018] Furthermore, the controller has a built-in target bin determination and material distribution control unit, which is configured to: when the real-time weight data of two or more storage bins are all lower than the preset replenishment weight limit, determine and execute replenishment of the target replenishment bins in sequence according to the preset replenishment priority order of storage bins or the order of real-time weight data from low to high; when controlling the material distribution device to switch conveying paths, each outlet of the material distribution device executes mutual exclusion output logic, and only one outlet is connected under any working condition, and the switching action must be performed after the previous replenishment process has completely stopped, the corresponding replenishment execution mechanism has stopped, and the bottom material in the conveying path has been emptied, and the time interval between the two switching actions is not less than the preset minimum switching time interval.

[0019] Furthermore, the controller has a built-in replenishment adjustment unit, which is configured to: preset a replenishment proximity threshold below the replenishment target value; when the difference between the real-time weight data of the target replenishment bin and the replenishment target value is greater than the replenishment proximity threshold, control the replenishment actuator to operate in high-speed mode; when the real-time weight data of the target replenishment bin reaches the replenishment proximity threshold (a preset weight threshold below the replenishment target weight, used to trigger the replenishment actuator to switch from high-speed replenishment mode to low-speed replenishment mode to avoid replenishment overshoot; its value is usually set to 80%-90% of the replenishment target weight, and 85% of the replenishment target weight is used in the embodiment), control the replenishment actuator to switch to low-speed mode.

[0020] Furthermore, the feeding actuator includes a feeder corresponding to each storage bin, a bottom material conveyor belt, and a feed gate. The first end of the bottom material conveyor belt is equipped with a belt scale connected to the controller. The controller has a built-in flow closed-loop control unit, which receives the actual material feed from the belt scale and adjusts the opening of the feed gate in a closed loop. The system also has a hard-wired emergency stop signal circuit independent of the controller. The trigger end of the hard-wired emergency stop signal circuit is connected to the weighing transmitter matched with the weighing sensor, and the execution end is connected to the main power supply circuit of the feeding actuator.

[0021] Compared to existing technologies, this invention and its preferred solution firstly address the material level detection stage. This solution abandons the traditional discrete material level detection method, which is easily affected by on-site working conditions. By setting weighing detection units at all load-bearing support points of the storage silo, it achieves continuous, accurate, and interference-resistant detection of the material inventory within the silo. This effectively solves the industry pain points of material level detection distortion and unreliable data in high-dust and high-vibration environments at sintering production sites, providing a stable and accurate core judgment basis for subsequent full-process automated control. Based on this, this solution constructs a fully collaborative automated control system. Driven by accurate weight detection data, it achieves fully unmanned operation from intelligent determination of the target replenishment silo and automatic switching of the feeding path to closed-loop precise replenishment. This completely replaces the traditional operation mode that relies on manual monitoring and operation, significantly reducing the labor intensity of on-site operators and eliminating the production risks caused by lag and misjudgment in manual operation at the root, thus ensuring a stable and continuous supply of base material. Meanwhile, this solution, through closed-loop variable-speed feeding control logic, balances efficiency and accuracy in the feeding process, effectively avoiding problems such as overfeeding and overflow. The accompanying dual-redundancy overflow protection in both hardware and software, along with a full-process fault interlocking mechanism, significantly improves the safety and stability of system operation, effectively preventing production accidents such as overflow, material shortage, and equipment malfunction, reducing abnormal equipment wear and tear, extending the service life of related equipment, and lowering production line maintenance costs. Furthermore, this solution adopts a universal and modular architecture design, allowing for upgrades and adaptations to existing sintering production lines without disruptive modifications. It can be widely applied to the construction and renovation of base material laying systems for various specifications of belt sintering machines, demonstrating excellent industry adaptability. Attached Figure Description

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 This is a control program diagram for the F51 hydraulic gate of this invention.

[0024] Figure 2 A control program diagram for a belt-driven F41 flap valve is provided as an embodiment of the present invention.

[0025] Figure 3 This is a diagram of the automatic warehouse entry setting interface of the host computer in an embodiment of the present invention;

[0026] Figure 4 This is a diagram of the interface for setting the flow rate parameters for the base material replenishment in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the bottom material laying system of the belt sintering machine according to an embodiment of the present invention. Detailed Implementation

[0028] To make the features and advantages of the present invention more apparent and understandable, specific embodiments are described below in detail:

[0029] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] The purpose of this invention is to address the technical deficiencies of existing belt sintering machine bottom material storage and feeding systems by providing an automatic bottom material feeding and weighing replenishment control method and system for belt sintering machines. This solution addresses common industry problems such as low automation, high reliance on manual labor, insufficient material level detection accuracy, high risk of overflow and material breakage, and fragmented control logic that prevents collaborative management. The solution is adaptable to various scenarios for the construction and renovation of bottom material feeding systems for belt sintering machines.

[0032] The core technical concept of this invention is to use the high-precision continuous weighing and detection data of the base material storage silo as the core control basis, and the programmable logic controller (PLC) as the control core to build a fully automated control system covering stable control of feed flow, intelligent automatic selection of multiple silos, accurate replenishment through weighing closed loop, and full-process safety interlock protection. This system completely replaces the traditional manual operation mode and realizes unmanned, precise and stable operation of the entire process of base material entering the silo and replenishing the material.

[0033] To achieve the above control logic, the control system of this invention adopts a universal architecture with full-process collaboration. The system includes a secondary screening device for screening sintered finished products that meet the particle size requirements of the base material. The discharge end of the screening device is connected to the main conveyor belt of the base material, which can transport the screened base material to the front-end flow regulation mechanism. The front-end flow regulation mechanism includes a feed gate plate set at the discharge end of the main conveyor belt and a belt scale installed at the beginning of the subsequent intermediate conveyor belt. The belt scale can collect the actual amount of base material discharged in real time. Both the feed gate plate and the belt scale are connected to the PLC control unit. The intermediate conveyor belt can transport the base material after flow regulation to the end three-way material distribution mechanism. The three-way material distribution mechanism uses an electric three-way material distribution valve, or a hydraulic flap structure adapted to the site conditions. It is located at the discharge end of the middle conveyor belt. The two discharge ports are connected to the inlets of at least two parallel-connected base material storage silos via branch conveyor belts, allowing for automatic switching of the base material feeding path. Each base material storage silo has a feeder at its bottom, connected to the PLC control unit, for subsequent base material supply. To achieve accurate detection of material levels in the silos, each load-bearing support point of each silo is equipped with a high-precision load cell. All load cells are connected to a weighing transmitter, which converts the collected weight signal into a standard 4-20mA industrial signal before connecting it to the PLC control unit, allowing real-time acquisition of the total weight of the base material in the corresponding silo. The system is centered around a PLC control unit, which can receive real-time signals from various detection mechanisms, execute preset control logic, and send control commands to each execution device. It is also equipped with an HMI human-machine interface unit that communicates with the PLC control unit, which can realize functions such as system parameter setting, real-time display of equipment operating status, switching between manual and automatic modes, and display of fault alarm information.

[0034] The automatic control process of this invention first completes the preset of system parameters and the switching of operating modes through the HMI human-machine interaction unit. Operators can preset core operating parameters such as the lower limit of replenishment weight, target weight, upper limit of replenishment weight, multi-bin replenishment priority, minimum time interval for switching three-way distribution valves, feed flow rate setting value, and filtering algorithm parameters for each group of storage bins according to the on-site working conditions. The system defaults to automatic control mode, and all parameters can be set and adjusted visually through the upper computer screen. During system operation, the weighing sensors of each storage silo collect the silo weight signal in real time. After being aggregated and converted into a standard signal by the weighing transmitter, the signal is input to the PLC control unit. The PLC control unit uses a composite filtering algorithm to preprocess the weight data. First, it uses amplitude limiting filtering (the threshold of which is the maximum allowable difference between two adjacent weight sampling data points, which is preset; when the difference between two sampling data points exceeds the threshold, the current sampling data is determined to be abnormal data and is removed, which is used to eliminate interference caused by material impact and equipment vibration; its value is set according to the full load capacity of the storage silo and the on-site working conditions, and is 5t in this embodiment) to remove abnormal data caused by material impact and belt vibration. Then, it uses moving average filtering (in the moving average filtering algorithm, the number of continuous weight sampling data points used to calculate the average value; the larger the number of window groups, the better the data smoothing effect, but the slower the data response speed. It needs to be set according to the weight data acquisition frequency and the degree of on-site interference. In this embodiment, 10 groups are preferred) to smooth the continuous valid data, eliminate on-site working condition interference, and ensure the stability and accuracy of the weight data. Based on this, the PLC control unit reads the pre-processed weight data of each group of storage bins in real time and compares it with the preset lower limit of replenishment weight. It automatically determines the target replenishment bin. When only the real-time weight of a single group of storage bins is lower than the lower limit of replenishment weight, the PLC control unit sends a switching command to the three-way distribution valve to switch the feeding path to the target replenishment bin. When the real-time weight of two or more groups of storage bins is lower than the lower limit of replenishment weight, the system will perform replenishment according to the preset priority order. It can also adopt a replacement replenishment strategy according to the working conditions. After completing the replenishment of a single bin, it will automatically switch to the next bin to be replenished. In order to avoid equipment damage caused by frequent valve switching, the switching action of the three-way distribution valve is equipped with interlocking logic and time delay protection. The switching action can only be performed after the previous bin replenishment process has completely stopped, the feeder has stopped, and the material on the conveyor belt has been emptied. The time interval between two switching actions must not be less than the preset minimum time interval.After the feeding path is switched, the PLC control unit will trigger a replenishment command, starting the corresponding feeder and conveying equipment to execute a closed-loop replenishment process. In the initial stage of replenishment, the difference between the real-time weight of the storage bin and the target weight is large, so the system controls the feeder to run in high-speed mode to achieve rapid replenishment. When the real-time weight of the storage bin reaches the preset threshold, the system controls the feeder to switch to low-speed mode to achieve precise and slow replenishment to avoid material over-rush. When the real-time weight of the storage bin reaches the preset target weight, the system immediately stops the feeder, closes the corresponding feeding path, and completes the single bin replenishment process. If there are other bins to be replenished, the system will automatically execute the target bin determination and path switching process to complete the replenishment operation in a loop. To ensure system safety and prevent production accidents such as material overflow, the system is equipped with a dual hardware and software anti-overflow protection mechanism. On the software side, when the real-time weight of the storage bin reaches the upper limit for replenishment, the PLC control unit will immediately trigger an emergency stop command, cutting off the power to the feeder and conveyor to stop feeding. On the hardware side, a hard-wired emergency stop signal circuit, independent of the PLC control unit, is set up. When the weight exceeds the limit, the main power to the feeder can be directly cut off, achieving redundant protection. Simultaneously, the system is equipped with full-process equipment fault interlock logic. When the conveyor, valve, or sensor malfunctions, the system will immediately stop the corresponding process, lock the valve switching action, and trigger a fault alarm in the HMI (Human-Machine Interface) unit to prevent equipment damage and production accidents.

[0035] This invention, through the aforementioned technical solution, enables unmanned, automated operation of the entire process of bottom material feeding and replenishment, completely replacing the traditional manual valve switching and manual start / stop replenishment operation mode. It eliminates human error and significantly reduces the workload of on-site operators, eliminating the need for full-process human intervention. This invention abandons the traditional limit-type level switch detection mode, employing high-precision weighing sensors to achieve real-time, continuous, and accurate detection of material levels within the silo. Combined with closed-loop replenishment control logic, it can precisely control the replenishment amount, effectively preventing silo overflow and predicting replenishment needs in advance, thus avoiding the impact of bottom material shortages on the continuity of sintering production. By combining closed-loop control of the front-end feed flow rate with closed-loop control of the back-end weighing and replenishment, along with multi-silo intelligent collaborative replenishment logic, this invention achieves closed-loop management of the entire bottom material conveying and storage chain. The system control logic is coherent and the operation is stable, effectively ensuring a continuous and stable supply of bottom material, providing support for the stable and smooth operation of the sintering production process. The core hardware used in this solution consists of mature, commonly used equipment in the metallurgical sintering industry. Upgrades can be completed without disruptive modifications to existing production lines, keeping costs under control. It is widely adaptable to various newly built or upgraded belt sintering machine bottom-laying systems. In particular, this invention is not limited to dual-compartment parallel bottom-laying systems; it can be extended to multi-compartment parallel belt sintering machine bottom-laying systems, demonstrating significant industrial application value. Furthermore, this invention effectively mitigates operational risks such as equipment overload, overflow, and malfunctions through dual hardware and software overflow protection and a full-process fault interlocking mechanism, extending equipment lifespan and reducing production line maintenance costs.

[0036] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. The described embodiments are only one specific implementation of the present invention, and not all embodiments. Based on the general solution of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This embodiment applies to two 260m units at Egang Steel. 2 The belt sintering machine's bottom material laying system is equipped with two sets of parallel bottom material storage silos, namely the first-stage bottom material silo and the second-stage bottom material silo. The specific implementation process is as follows:

[0038] 1. Hardware upgrade implementation

[0039] like Figure 5As shown, in this embodiment, the base material comes from the secondary screening chamber of the sintered finished product. After screening, the base material that meets the particle size requirements is conveyed by the main conveyor belt of screen 2-7 to the F41 discharge hopper. The F41 discharge hopper is equipped with a feed gate driven by a hydraulic push rod, which serves as the front-end flow regulation mechanism of the system. After the material is regulated by the gate, it enters the intermediate conveyor belt of the first base material layer. An electronic belt scale is installed at the beginning of the first base material layer conveyor belt, which can collect the actual discharge amount of the base material in real time, providing data support for the flow closed-loop control. The discharge end of the first base material layer conveyor belt is equipped with an F51 hydraulic flap three-way distribution valve, which serves as the feed path switching mechanism of the system. Its two discharge ports correspond to the second and third base material layers, respectively. The discharge end of the second base material layer conveyor belt is connected to the first-stage base material silo, and the discharge end of the third base material layer conveyor belt is connected to the second-stage base material silo, forming two independent replenishment paths.

[0040] Both Phase I and Phase II base material silos are four-point load-bearing structures. Each load-bearing support point is equipped with a high-precision weighing sensor covering the weight from empty to full load. The signals from the four sensors are collected by a weighing transmitter, converted into a 4-20mA standard industrial signal, and then connected to the existing PLC control cabinet of the sintering system to achieve real-time continuous acquisition of the weight of the base material in the silos. Simultaneously, the control signals and status feedback signals of the F41 feed gate, F51 three-way distribution valve, base material conveyor belts (Phase I / Phase II / Phase III), and the bottom feeders of the two storage silos are all connected to the PLC control cabinet, forming a complete control closed loop. The HMI (Human-Machine Interface) uses the existing host computer on site, with two new dedicated control screens added, one of which is the automatic base material feeding monitoring screen, which can be found in [reference needed]. Figure 3 This screen is the core visual interface for operators to manage the automatic feeding process of the base material. All displayed elements completely correspond to the hardware architecture and control logic of this embodiment. In the screen, S3 (Pile-1) corresponds to the intermediate conveyor belt of Pile-1 in this embodiment, 1S-4 (Pile-2) and 2S-3 (Pile-3) correspond to the branch conveyor belts of Pile-2 and Pile-3 in this embodiment, respectively, and F51 corresponds to the three-way material distribution valve in this embodiment. It completely restores the topology of the entire process of base material feeding from intermediate conveying and material distribution to dual-bin feeding.

[0041] The real-time weight values ​​of 22.22t for the first-phase paving trough and 25.71t for the second-phase paving trough displayed on the screen are directly from the real-time weight data collected by the weighing sensors of the two storage silos and pre-processed by the PLC. Figure 1 The core input parameters of the control program are completely consistent, serving as the sole basis for the system's automatic bin selection and priority determination. The screen simultaneously displays the real-time opening degree (0.498m) and "closed" mechanical status feedback of the F51 three-way distribution valve; this feedback signal is directly connected to... Figure 1 The final output link of the control program is the core prerequisite for the system to determine that the valve switching is complete and allow the material replenishment process to start. It is completely consistent with the interlock rule of "material replenishment can only be started after the valve has fully operated" in this embodiment.

[0042] The integrated manual / automatic switch on the screen directly corresponds to... Figure 1 The M_F51_MS mode switching flag in the control program allows operators to switch control modes with a single button press using a lever; the red emergency stop button, equipment status indicator light, and fault alarm position on the screen are directly connected to... Figure 1 The system interlock master control position of the control program can realize the full-process control of one-click emergency stop command issuance, real-time monitoring of equipment operation status, and immediate alarm of fault information, which is completely consistent with the fault emergency stop interlock protection rules of this embodiment.

[0043] Another set of screens is for setting the flow rate parameters for the base material replenishment; see [link / reference]. Figure 4 This screen is the core operating interface for operators to set and control the feed flow rate of the base material. All parameters and operating controls are consistent with the flow closed-loop control rules of this embodiment. Figure 2 The PLC control program is completely compatible. In the screen, 2LS4 (screen 2-7) corresponds to the main conveyor belt of the base material in this embodiment, and F41 corresponds to the front feed gate in this embodiment, completely restoring the core process flow of base material arrival and gate flow regulation.

[0044] The flow rate setpoint of 70t / h shown in the image directly corresponds to the preset feed flow rate setting value in this embodiment. Figure 2 The core benchmark for flow deviation comparison in the control program; the flow feedback value of 65t / h on the screen comes directly from the real-time data collected by the electronic scale at the beginning of the conveyor belt. Figure 2 The real-time display of the program's moving average filter preprocessing is the core comparison basis for flow closed-loop regulation; the real-time gate opening of 293mm shown on the screen comes from the mechanical position feedback of the F41 feed gate. Figure 2 The core feedback parameters of the program-step opening adjustment are perfectly matched with the flow closed-loop adjustment rules of this embodiment.

[0045] The integrated automatic / manual switching lever on the screen directly corresponds to... Figure 2 The M_F41_MS mode switching flag in the control program allows operators to switch flow control modes with a single key press using a lever; the "On" and "Off" manual buttons on the screen directly correspond to... Figure 2 The program's manual control link allows direct control of the gate opening during debugging and emergency scenarios; the flow setpoint input box on the screen allows direct modification of the flow target, and the modified parameters are sent to the relevant departments in real time. Figure 2 The PLC control program enables online adjustment of flow regulation parameters and serves as the core interactive entry point for front-end flow closed-loop control in this embodiment.

[0046] 2. Implementation of control logic

[0047] After the system is powered on, the operator first presets the core operating parameters through the host computer screen. Specifically, the minimum replenishment weight of the first and second phase foundation material bins is 70% of the full load capacity of the bin, the target weight is 80%, the maximum replenishment weight is 90%, the replenishment priority of the two bins is set to the first phase bin first, the minimum time interval for switching the three-way material distribution valve is 30s, the feed flow rate of the first belt is set to 70t / h, and the weight data filtering algorithm parameters are a limit threshold of 5t and a sliding average window of 10 sets of data. After the parameters are set, the system enters the automatic control mode by default.

[0048] During system operation, the weighing sensors of the two storage silos collect the weight signals of the silos in real time. After being summed and converted by the weighing transmitter, the signals are input into the PLC control cabinet. The PLC uses a composite algorithm of amplitude limiting filter and moving average filter to smooth the original weight data, eliminating abnormal jumps caused by belt vibration and material falling impact, ensuring that the output weight data is stable and reliable, and providing accurate judgment basis for subsequent control logic.

[0049] The PLC compares the pre-processed weight data of the two storage bins with the preset replenishment weight limit in real time, automatically determining the target replenishment bin and switching the feeding path. Initially, the real-time weight of the Phase I bin is 60% of its full capacity, and the Phase II bin is 65%. Both bins' weights are below the 70% replenishment limit. According to the preset priority, the system prioritizes the Phase I bin as the target replenishment bin and then sends a switching command to the F51 three-way distribution valve, switching the feeding path to the Phase I bin. After the valve completes its action, it sends an open-to-position signal back to the PLC. The complete control logic for this switching action can be found in [link to relevant documentation]. Figure 1 The diagram fully illustrates the complete program logic for valve manual / automatic dual-mode switching, dual-compartment weight signal comparison and calculation, priority judgment, closed-loop feedback of valve position, time delay and interlock protection, and emergency stop interlock in case of failure. During the switching process, the system's interlock logic takes effect simultaneously. The subsequent material replenishment process can only be started after the valve has fully actuated and there is no material residue in the preceding conveying path. Furthermore, the time interval between two valve switching actions must not be less than the preset 30 seconds to avoid equipment damage caused by frequent valve switching.

[0050] Specifically, this program is a preferred implementation of the function block diagram control logic of the industrial general PLC system in this embodiment. All function blocks are standard instructions commonly used in the field of metallurgical industrial control, and their core logic, which corresponds one-to-one with the control rules of this embodiment, is as follows. The program uses the real-time weight detection value of the first and second phase bottom material storage silos as the core judgment basis. The values ​​27.91209 and 23.58974 in the figure correspond to the real-time weight data of the two storage silos after being collected and converted by the weighing sensor and transmitter, respectively, providing the core triggering condition for the entire automatic silo selection logic. The leftmost part of the program uses the standard function block links of subtraction, absolute value, and greater than or equal to comparison to realize the core control rule of feeding material to the silo with the lower material level when the weight difference between the two silos is greater than 5 tons. First, the real-time weight difference between the two storage silos is calculated by the subtraction function block. After the absolute value function block eliminates the influence of the silo number order, it is compared with the preset 5-ton weight difference threshold. Only when the weight difference meets the threshold requirement will a valid trigger signal be output, thus avoiding malfunctions caused by instantaneous fluctuations in the weighing signal and material impact from the source. It should be noted that the values ​​shown in the above program are real-time sampled values ​​at a certain running moment of the system, and do not conflict with the preset control parameters of this embodiment.

[0051] To achieve time delay and protection against frequent switching, the program sets up a two-level timer function block. The first level is a 15-second power-on delay timer, which will only output a valid trigger signal to the next level after the weight difference threshold has been met and remained stable for 15 seconds, thus achieving anti-shaking filtering in the field. The second level is a 15-second pulse timer, which is connected in series in the output links of the two valve actions. After each valve switching action is triggered, it will forcibly lock a minimum action interval of a fixed duration. In this embodiment, it can be directly adjusted to a preset 30 seconds according to the field conditions, completely avoiding mechanical structure wear caused by frequent valve switching, which is completely consistent with the interlocking protection rules of this embodiment.

[0052] The program achieves seamless switching between manual and automatic dual control modes through two sets of core selection switch function blocks. The mode switching bit M_F51_MS is the core switching switch of the entire logic. When this bit is 1, the program executes automatic control logic, and the valve switching action is driven entirely by the weight comparison result of the two compartments. When this bit is 0, the program switches to manual control mode, and the operator directly controls the valve action through a manual start signal, which takes into account both the automation needs during normal production line operation and the manual operation needs during on-site debugging and emergency response. To prioritize the target replenishment bin, the program uses multiple sets of greater than or equal to and less than comparison function blocks to compare the real-time weight of the two storage bins. It automatically determines the storage bin with the lower material level as the priority replenishment target. At the same time, through the full bin threshold comparison function, the replenishment action is only allowed to be triggered when the weight of the target storage bin has not reached the preset full bin limit, thus avoiding the risk of overflow from the control logic level in advance. Only when the three conditions of "the target bin material level is lower, the weight difference threshold is continuously met, and the target bin is not full" are met simultaneously, will the AND gate function block output a valid trigger signal to drive the corresponding valve switching action.

[0053] At the action execution and safety protection level, the final output link of the program connects the valve mechanical position feedback signal and mutually exclusive output logic. Only after the valve completes the mechanical switching action and feeds back the open position signal to the PLC will the final valve execution coil be activated, forming a complete action feedback closed loop. This strictly ensures that the subsequent material replenishment process can only be started after the valve switching action is fully in place. At the same time, the program logic ensures that the two valve execution coils are mutually exclusive outputs and will not be activated simultaneously under any operating condition, realizing hardware-level interlocking of the two feeding paths. In addition, the program sets a system interlock master control position in the valve action output link. This position is connected to the system emergency stop signal, equipment fault signal, conveyor belt running status signal, sensor abnormal signal and other full-process interlocking conditions. The interlock master control position will only be set when the system is fault-free, the emergency stop is not triggered, and the conveyor equipment is running normally, allowing the valve switching action to be executed. Once an abnormal operating condition occurs, the interlock master control position will immediately reset, cut off the valve action output and lock the switching process, realizing full-process fault and emergency stop interlocking protection.

[0054] After the feeding path is switched, the PLC triggers a replenishment command, starting the corresponding feeder and conveyor belt to execute a closed-loop replenishment process. Initially, the difference between the real-time weight and the target weight in the first-phase warehouse is large, so the system controls the feeder to run in high-speed mode for rapid replenishment. When the real-time weight in the first-phase warehouse reaches 85% of the target weight, which is close to the preset threshold, the system controls the feeder to switch to low-speed mode for precise and gradual replenishment, avoiding material over-rush. When the real-time weight in the first-phase warehouse reaches 90% of the replenishment weight limit, the system immediately stops the feeder, completing the replenishment process for the first-phase warehouse. After replenishment in the first-phase warehouse, the PLC automatically sends a switching command to the F51 three-way distribution valve, switching the feeding path to the second-phase warehouse and repeating the closed-loop replenishment process to complete the replenishment operation in the second-phase warehouse.

[0055] Throughout the feeding process, the F41 feed gate synchronously executes closed-loop control of the feed flow rate. The complete program for this control logic can be found in [link to relevant documentation]. Figure 2 The diagram fully illustrates the complete program logic for the gate's manual / automatic dual-mode switching, closed-loop adjustment of the set and actual material discharge values, gate opening control and feedback closed loop, belt operation status interlocking, and fault protection. During execution, the PLC compares the 70t / h feed flow rate set by the host computer with the real-time actual material discharge value collected by the belt conveyor scale. It automatically controls the opening of the F41 gate using a step-by-step closed-loop adjustment algorithm. When the actual material discharge is less than the set value, the gate opening is increased to increase the feed rate; when the actual material discharge is greater than the set value, the gate opening is decreased to reduce the feed rate. This ensures that the flow rate of the base material entering subsequent material distribution and replenishment stages remains stable, providing a stable material supply basis for precise replenishment.

[0056] Specifically, this program is a preferred implementation of the function block diagram control logic of the industrial general PLC system in this embodiment. All function blocks are standard instructions commonly used in the field of metallurgical industry control. The core logic corresponding to the flow closed-loop control rules in this embodiment is as follows. The program uses the 70t / h feed flow rate set by the host computer in this embodiment and the actual real-time discharge volume collected by a belt scale as the core control basis. In the figure, value 70 corresponds to the flow rate set value and value 72 corresponds to the pre-processed actual real-time discharge volume, which completely matches the parameter settings in this embodiment, providing a core comparison benchmark for the entire flow closed-loop control.

[0057] The program first preprocesses the raw material feeding data collected by the belt scale through the moving average filtering function block. In the figure, the AGMMV function block uses 10 consecutive sampled data as a window to perform moving average filtering on the real-time collected raw flow data of 73.24786t / h. Then, the real number to integer function block completes the data format conversion and outputs a stable effective actual value of 72t / h. This eliminates sampling interference caused by belt running vibration, material impact, and instantaneous flow fluctuations, ensuring the stability and reliability of the flow comparison benchmark. This is in line with the core requirement of eliminating on-site working condition interference in this solution.

[0058] The leftmost part of the program constructs the core logic for judging flow deviation through a chain of standard function blocks using subtraction, absolute value, and greater than comparison. First, the subtraction function block calculates the real-time deviation between the setpoint and the actual flow rate. After the absolute value function block eliminates the influence of the positive and negative directions of the deviation, it is compared with a preset deviation threshold of 2t / h. Only when the absolute value of the flow deviation is ≥2t / h will a valid adjustment trigger signal be output, preventing frequent gate operation due to small flow fluctuations and protecting the gate's mechanical structure. Based on this, the program uses two sets of comparison function blocks to determine the direction of deviation: when the actual feed rate is less than the setpoint, a valve opening adjustment command is triggered; when the actual feed rate is greater than the setpoint, a valve closing adjustment command is triggered, completely consistent with the flow regulation rules of this embodiment. Simultaneously, the program sets upper and lower limit logic for the gate opening. Through two sets of comparison function blocks, minimum and maximum safety thresholds for the gate opening are preset. Opening and closing adjustment actions are only allowed when the real-time gate opening is within the preset range, preventing equipment damage caused by gate overtravel.

[0059] To achieve seamless switching between manual and automatic control modes, the program constructs a mode switching link through a core selection switch function block. The mode switching bit M_F41_MS is the core switching switch of the entire logic. When this bit is 1, the program executes the automatic control mode, and the opening and closing adjustment of the gate is driven entirely by the flow deviation comparison result. When this bit is 0, the program switches to manual control mode, and the operator directly controls the opening and closing of the gate through the manual button on the host computer. This takes into account both the automatic flow stability requirements during normal production line operation and the manual operation requirements during on-site debugging and emergency response.

[0060] To achieve anti-shake filtering and protection against frequent actions, the program is equipped with two levels of timer function blocks. The first level is a 10-second power-on delay timer, which only outputs an effective adjustment signal to the next level after the flow deviation trigger condition has been stable for 10 seconds, further filtering out false triggers caused by instantaneous flow fluctuations. The second level is a pulse timer, which is connected in series in the output links of the valve opening and closing links respectively. The valve opening link is preset with a pulse duration of 0.45 seconds and the valve closing link is preset with a pulse duration of 0.15 seconds. Each adjustment action only outputs a pulse drive signal of a fixed duration, realizing step-by-step fine adjustment of the gate opening, avoiding flow overshoot caused by a large adjustment at once, and ensuring a smooth transition of the feed flow.

[0061] At the equipment interlocking and safety protection level, the core adjustment link of the program connects the belt conveyor running status flag S3_MC. The gate is only allowed to perform adjustment actions when the belt is in normal operation. If the belt stops or malfunctions, the gate adjustment function is immediately locked (the duration of the drive electrical signal output to the gate actuator each time the gate opening adjustment is triggered is used to achieve step-by-step fine adjustment of the gate opening to avoid flow overshoot caused by a large adjustment at one time; its value is set according to the response speed of the gate actuator and the on-site working conditions. In this embodiment, the valve opening link is preferably 0.45s and the valve closing link is preferably 0.15s) to avoid material accumulation and blockage accidents caused by the gate opening when the belt is stopped. In the final output link of the program, the mechanical positioning feedback signal of the gate is connected in series with the system interlocking master control position. The next adjustment action is only allowed to be executed after the gate completes the previous adjustment action and provides feedback on the open / closed position signal, forming a complete action feedback closed loop. The interlocking master control position F41_KA1 is connected to the system emergency stop signal, gate fault signal, belt scale sensor abnormal signal and other full-process interlocking conditions. The interlocking master control position will only be set when there is no system fault and the emergency stop is not triggered, allowing the gate adjustment action to be executed. Once an abnormal working condition occurs, the interlocking master control position will be reset immediately, cut off the gate action output and lock the adjustment process, realizing full-process fault and emergency stop interlocking protection.

[0062] To ensure system safety and prevent production accidents such as material spills, the system is equipped with a dual hardware and software anti-overflow protection mechanism and a full-process fault interlock logic. During system operation, if the real-time weight of the storage bin reaches 90% of the replenishment limit, the PLC will immediately trigger an emergency stop command, cutting off the power supply to the feeder and the corresponding conveying equipment, thus stopping feeding. Simultaneously, the system has a hard-wired emergency stop signal loop independent of the PLC control unit. When the weight exceeds the limit, it can directly cut off the feeder's main power supply without PLC program calculation, achieving redundant protection and completely eliminating the risk of material spills. When the conveying equipment malfunctions, valves fail to operate properly, or sensor signals are abnormal, the system will immediately stop the corresponding process, lock the valve switching action, and trigger a fault alarm on the host computer screen, notifying maintenance personnel to handle the situation promptly and prevent equipment damage and production accidents.

[0063] After the modification according to the above-described solution in this embodiment, the entire process of feeding and replenishing the sintering base material requires no manual intervention, achieving fully automated operation. On-site operators only need to monitor the equipment's operating status on the host computer and adjust the operating parameters according to the working conditions, significantly reducing the intensity of manual labor and completely eliminating problems such as incorrect feeding and material interruption caused by human error. After the modification, the system operates stably, and there has been no overflow of the base material silo, completely solving the pain point of manual clearing after overflow. At the same time, through stable flow control and precise replenishment management, a continuous and stable supply of base material is ensured, providing strong support for the stable and smooth operation of the sintering production line.

[0064] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

[0066] This invention is not limited to the above-described preferred embodiments. Anyone inspired by this invention can derive other forms of automatic feeding and weighing control methods and systems for bottom material in belt sintering machines. All equivalent variations and modifications made within the scope of the claims of this invention shall fall within the scope of this invention.

Claims

1. A method for automatic feeding and weighing of bottom material in a belt sintering machine, characterized in that: Based on the weighing sensors installed at each load-bearing support point of at least two parallel base material storage bins, the real-time weight data of the base material in each storage bin is continuously acquired, and anti-interference processing is performed on the real-time weight data to eliminate signal fluctuations caused by on-site working conditions. Using the real-time weight data after anti-interference processing as the sole decision basis for replenishment control, the real-time weight data is compared with the preset replenishment weight lower limit to automatically determine the target replenishment bin and control the material distribution device to switch the bottom material conveying path to the target replenishment bin. During the replenishment process to the target replenishment bin, the operating status of the replenishment actuator is continuously adjusted in a closed loop using the real-time weight data after anti-interference processing as feedback, until the real-time weight data reaches the preset replenishment target value and the replenishment stops. The replenishment target value is lower than the physical capacity limit of the storage bin.

2. The automatic feeding and weighing replenishment control method for bottom material laying in a belt sintering machine according to claim 1, characterized in that: The anti-interference processing performed on the real-time weight data is a composite filtering process. First, the amplitude limiting filter is used to remove abnormal weight data caused by material impact and equipment vibration. Then, the effective weight data after amplitude limiting filter is smoothed by the moving average filter.

3. The automatic feeding and weighing replenishment control method for bottom material laying in a belt sintering machine according to claim 1, characterized in that: When the real-time weight data of two or more storage bins are all lower than the preset replenishment weight limit, the replenishment of the target replenishment bin is determined and executed in sequence according to the preset replenishment priority order of storage bins or the order of real-time weight data from low to high. When the material distribution device switches the conveying path, each outlet of the material distribution device executes the mutual exclusion output logic. Only one outlet is connected under any working condition. The switching action must be performed after the previous replenishment process has completely stopped, the corresponding replenishment execution mechanism has stopped, and the bottom material in the conveying path has been emptied. The time interval between the two switching actions is not less than the preset minimum switching time interval.

4. The automatic feeding and weighing replenishment control method for bottom material laying in a belt sintering machine according to claim 1, characterized in that: The closed-loop control of the feeding actuator's operating status is as follows: a feeding proximity threshold is preset below the feeding target value. When the difference between the real-time weight data of the target feeding bin and the feeding target value is greater than the feeding proximity threshold, the feeding actuator is controlled to operate in high-speed mode. When the real-time weight data of the target feeding bin reaches the feeding proximity threshold, the feeding actuator is controlled to switch to low-speed mode.

5. The automatic feeding and weighing control method for bottom material laying in a belt sintering machine according to claim 1, characterized in that: During the replenishment process, closed-loop control of the feed flow rate is also implemented. The actual feed amount of the bottom material conveyor belt is obtained in real time, compared with the preset feed flow rate setting value, and the opening of the feed gate is automatically adjusted to keep the actual feed amount stable within the feed flow rate setting value range. A replenishment weight limit higher than the replenishment target value is preset. When the real-time weight data of the storage bin reaches the replenishment weight limit, an emergency stop command is immediately triggered to stop the operation of the corresponding equipment. At the same time, the main power supply of the corresponding replenishment actuator is cut off through a hard-wired emergency stop signal circuit independent of the control process.

6. An automatic feeding and weighing control system for bottom material laying in a belt sintering machine, characterized in that: It includes at least two parallel-connected base material storage bins, a material distribution device, a material replenishment mechanism, and a controller; each load-bearing support point of each group of storage bins is equipped with a weighing sensor connected to the controller; the material distribution device is used to switch the conveying path of the base material to any of the storage bins; the material replenishment mechanism is configured corresponding to each storage bin; and the controller is connected to each weighing sensor, material distribution device, and material replenishment mechanism. The controller is configured to: receive weight signals from each weighing sensor and perform anti-interference processing to obtain real-time weight data for each storage bin; use the anti-interference processed real-time weight data as the sole decision basis for replenishment control, compare the real-time weight data with a preset replenishment weight lower limit, automatically determine the target replenishment bin, and control the dispensing device to switch to the corresponding conveying path; control the replenishment actuator to replenish the target replenishment bin, and continuously adjust its operating state in a closed loop using the real-time weight data of the target replenishment bin as feedback during the replenishment process, until the real-time weight data reaches a preset replenishment target value, at which point it controls the replenishment to stop, and the replenishment target value is lower than the physical capacity limit of the storage bin.

7. The automatic feeding and weighing control system for bottom material laying in a belt sintering machine according to claim 6, characterized in that: The controller has a built-in composite filtering processing unit, which is configured to: firstly, remove abnormal weight data caused by material impact and equipment vibration through amplitude limiting filtering, and then smooth the effective weight data after amplitude limiting filtering through moving average filtering.

8. The automatic feeding and weighing control system for bottom material laying in a belt sintering machine according to claim 6, characterized in that: The controller has a built-in target bin determination and material distribution control unit, which is configured to: when the real-time weight data of two or more storage bins are all lower than the preset replenishment weight limit, determine and execute replenishment of the target replenishment bins in sequence according to the preset replenishment priority order of storage bins or the order of real-time weight data from low to high; when controlling the material distribution device to switch conveying paths, each outlet of the material distribution device executes mutual exclusion output logic, and only one outlet is connected under any working condition, and the switching action must be performed after the previous replenishment process has completely stopped, the corresponding replenishment execution mechanism has stopped, and the bottom material in the conveying path has been emptied, and the time interval between two switching actions is not less than the preset minimum switching time interval.

9. The automatic feeding and weighing control system for bottom material laying in a belt sintering machine according to claim 6, characterized in that: The controller has a built-in replenishment adjustment unit, which is configured to: preset a replenishment proximity threshold below the replenishment target value; when the difference between the real-time weight data of the target replenishment bin and the replenishment target value is greater than the replenishment proximity threshold, control the replenishment actuator to operate in high-speed mode; when the real-time weight data of the target replenishment bin reaches the replenishment proximity threshold, control the replenishment actuator to switch to low-speed mode.

10. The automatic feeding and weighing control system for bottom material laying in a belt sintering machine according to claim 6, characterized in that: The feeding actuator includes a feeder corresponding to each storage bin, a bottom material conveyor belt, and a feed gate. The first end of the bottom material conveyor belt is equipped with a belt scale connected to the controller. The controller has a built-in flow closed-loop control unit, which receives the actual material feed from the belt scale and adjusts the opening of the feed gate in a closed loop. The system also has a hard-wired emergency stop signal circuit independent of the controller. The trigger end of the hard-wired emergency stop signal circuit is connected to the weighing transmitter that is matched with the weighing sensor, and the execution end is connected to the main power supply circuit of the feeding actuator.

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