A control method for reverse conveying of materials by a powder ore bin feeding belt across a grinding and flotation workshop

Abstract

The application discloses a kind of powder ore bin feeding belt crossing mill floating workshop material reverse conveying control method, it is related to mineral processing material conveying control technical field, including acquisition powder ore bin, bin top return material port, bin bottom discharge gate, first conveyor belt, second conveyor belt, first cleaning component and second cleaning component state, form forward feeding record, reverse return material record and bin body receiving record;Determine reverse return material batch and estimated time period to bin, generate direct into bin, let material into bin, wait before bin or prohibit new return material receiving result;According to receiving result linkage execution and form reverse return material execution record;Reverse return material execution record is closed to be confirmed and is rewritten forward feeding record, reverse return material record and bin body receiving record.By closing confirmation to reverse return material execution record, distinguish return material closure, return material retention, return material and bin bottom discharge conflict or into bin corresponding exception, reduce timing conflict and improve the reliability of reverse return material batch closure.

Description

Technical Field

[0001] This invention relates to the field of mineral processing material conveying control technology, and in particular to a method for controlling the reverse conveying of materials across a grinding and flotation workshop using a feed belt in a fine ore bin. Background Technology

[0002] In the mineral processing industry, ore powder bins typically serve as temporary storage, buffering, and balanced feeders for crushed and screened ore powder. They are crucial material nodes connecting the upstream crushing and screening stages with the downstream grinding and flotation stages. Existing ore powder bin feeding belt conveyor technologies often employ a combination of bin bottom gates, feeders, belt conveyors, belt scales, level gauges, and interlocking protection devices. This continuous or intermittent conveying method stably delivers ore powder into the grinding and flotation workshop, ensuring a relatively balanced throughput in the grinding process. For materials that need to be returned to the ore powder bin during screening or separation... Engineering sites typically include return conveyor belts, guide components, and cleaning mechanisms to ensure that returned materials are sent back to the fine ore bin along a predetermined route. This reduces the need for loader handling and manual cleaning, improves site layout compactness, and enhances material circulation efficiency. As the automation level of concentrators increases, existing conveying controls generally incorporate signals such as material level detection, weighing detection, belt start / stop, blockage protection, deviation protection, and slippage protection to achieve basic interlocking control between fine ore bin inflow / outflow, belt conveying, and equipment safety protection. This improves the continuity, safety, and on-site management efficiency of the fine ore conveying process.

[0003] Existing methods mainly rely on top-of-bin material receiving, belt start / stop, and safety interlocks. They lack a unified approach to assessing the expected arrival time of reverse material return batches, the material discharge gate at the bottom of the bin, and the material feeding requirements of the grinding and floating workshop. This can easily lead to timing conflicts between material return into the bin and material discharge from the bottom of the bin. Material return is usually completed based on the belt emptying or dropping status. There is a lack of confirmation of closure for material return closure, material return stagnation, conflicts between material return and material discharge from the bottom of the bin, and corresponding abnormalities in material return, based on reverse material return batches. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a method for controlling the reverse material transport of powder ore bin feeder belts across the grinding and flotation workshop, which solves the problem of the lack of unified receiving judgment between the reverse material return process, the bottom material discharge process, and the feeding demand of the grinding and flotation workshop, and the lack of batch-based closed confirmation after the reverse material returns into the bin.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a method for controlling the reverse material conveying across a grinding and flotation workshop using a feed belt in a fine ore bin, comprising: The system collects data on the ore powder bin level, the top return port, the bottom discharge gate, the material status on the first conveyor belt, the feeding requirements of the grinding and flotation workshop, and the status of the separator, the second conveyor belt, the first cleaning component, and the second cleaning component, forming positive feeding records, reverse return records, and bin receiving records.

[0007] Based on the reverse material return records, the reverse material return batch and the expected arrival time in the warehouse are determined. Based on the warehouse receiving records, forward feeding records, the material status on the first conveyor belt and the feeding requirements of the grinding and floating workshop, the receiving results are generated as follows: direct entry into the warehouse, allowing material to enter the warehouse, waiting before arrival in the warehouse, or prohibiting new material return.

[0008] Based on the received results, the linkage control system controls the material guiding of the separator, the operation of the second conveyor belt, the introduction of the first cleaning component, the entry of the second cleaning component into the silo, and the action of the bottom discharge gate of the silo. This system continuously enters the silo for batches that are directly entering the silo, allows batches that are allowed to enter the silo to enter after allowing material to enter, allows batches that are waiting before entering the silo to enter after waiting, and stops the addition of new batches that are prohibited from being added back, thus forming a reverse material return execution record.

[0009] Based on the changes in weighing of the second conveyor belt, confirmation of material falling from the top of the silo, changes in the material level of the fine ore silo, weighing value of material discharged from the bottom of the silo, and changes in feeding in the grinding and flotation workshop, the reverse material return execution record is closed and confirmed to obtain the closing results of material return closure, material return retention, material return conflict with material discharge from the bottom of the silo, or abnormal material entry into the silo, and these results are written into the forward feeding record, reverse material return record, and silo receiving record.

[0010] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the following steps are taken: The collection of data on the powder ore bin level, the top return port, the bottom discharge gate, the material status on the first conveyor belt, the feeding demand of the grinding and flotation workshop, the status of the separator, the second conveyor belt, the first cleaning component, and the second cleaning component, to form a forward feeding record, a reverse return record, and a bin receiving record, specifically: At the same acquisition time, the following data are collected: ore bin material level, bin top return port opening / closing and blockage status, bin bottom discharge gate opening and bin bottom discharge weighing value, first conveyor belt start / stop status, first conveyor belt speed, first conveyor belt weighing value, grinding and flotation workshop feeding requirements, separator guiding status, first cleaning component introduction status, second conveyor belt start / stop status, second conveyor belt speed, second conveyor belt weighing value, second conveyor belt slippage signal, second conveyor belt deviation signal, second cleaning component bin entry status, and second cleaning component action feedback.

[0011] The silo receiving record is generated based on the ore powder silo level, the opening and closing of the silo top return port and the blockage status. The positive feeding record is generated based on the silo bottom discharge gate opening, the silo bottom discharge weighing value, the material status on the first conveyor belt and the feeding requirements of the grinding and flotation workshop. The reverse return record is generated based on the separation component guiding status, the first cleaning component introduction status, the second conveyor belt status and the second cleaning component entering the silo status.

[0012] As a preferred embodiment of the material reverse conveying control method for the feed belt of the fine ore bin across the grinding and flotation workshop described in this invention, the specific steps for determining the reverse return batch and the expected arrival time in the bin based on the reverse return material record are as follows: If there are unclosed reverse return batches in the reverse return record of the previous control cycle, the unclosed reverse return batches of the previous control cycle will be merged into the reverse return record of the current control cycle.

[0013] The change in the weighing value of the second conveyor belt relative to the no-load allowable error specified in the valid verification or calibration certificate of the second conveyor belt weighing device is used as the basis for the start and end of the batch. When the weighing value of the second conveyor belt changes from within the no-load allowable error to exceed the no-load allowable error, it is recorded as the front end of the reverse return batch entering the second conveyor belt. When the weighing value of the second conveyor belt changes from exceeding the no-load allowable error back to within the no-load allowable error, it is recorded as the rear end of the reverse return batch entering the second conveyor belt.

[0014] When the substandard gold ore powder introduced by the separator and the residual ore powder introduced by the first cleaning component continuously enter the second conveyor belt before the weighing value of the second conveyor belt falls back to within the allowable error of no-load, they are classified into the same reverse return batch.

[0015] Based on the speed of the second conveyor belt and the installation distance between the second conveyor belt inlet and the top return port of the silo, the estimated arrival time of the front and rear ends of the reverse return batch at the top return port of the silo is determined.

[0016] As a preferred embodiment of the reverse material conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the step of generating receiving results based on the bin receiving record, forward feeding record, the material status on the first conveyor belt, and the feeding requirements of the grinding and flotation workshop, including: direct entry into the bin, allowing material into the bin, waiting before entering the bin, or prohibiting new material return, includes: When the receiving record of the silo shows that the powder silo is full, the top return port of the silo is blocked, or the second cleaning component is abnormal when entering the silo, or when the reverse return record shows that the second conveyor belt is slipping or the second conveyor belt is off-center, a receiving result prohibiting the addition of new return materials is generated, and the execution content of triggering reason, separating component stopping material feeding, first cleaning component pausing import, and second conveyor belt stopping receiving new reverse return material batches is written.

[0017] When the ore powder bin is ready to receive material, the second conveyor belt is conveying material, the bottom discharge gate of the bin is closed, and the expected arrival time has been formed, a direct entry receiving result is generated, and the following execution contents are written: reverse return batch number, expected arrival time, separation component continues to guide material, first cleaning component allows import, second conveyor belt runs continuously, and bottom discharge gate of the bin remains closed.

[0018] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the method further includes: generating receiving results such as direct entry into the bin, allowing material into the bin, waiting before entering the bin, or prohibiting new material return based on the bin receiving record, forward feeding record, material status on the first conveyor belt, and feeding requirements of the grinding and flotation workshop; Based on the belt speed of the first conveyor belt and the installation distance between the weighing position of the first conveyor belt and the feeding inlet of the grinding and flotation workshop, the estimated time period for the first conveyor belt to carry material into the feeding inlet of the grinding and flotation workshop is determined. The weighing values ​​of the first conveyor belt with the estimated arrival time no later than the end time of the estimated arrival time are summarized according to the cumulative mass caliber to obtain the amount of material on the first conveyor belt. The amount of material on the first conveyor belt is then compared with the feeding demand of the grinding and flotation workshop determined according to the cumulative mass caliber in the same time period to determine whether the material on the first conveyor belt can meet the feeding demand of the grinding and flotation workshop.

[0019] When the ore powder bin is ready to receive material, the second conveyor belt is conveying material, the bottom discharge gate of the bin is discharging material, the expected arrival time of the material in the bin has been formed, and the first conveyor belt is able to meet the feeding needs of the grinding and flotation workshop, the receiving result of letting the material into the bin is generated.

[0020] When no receiving result is generated prohibiting new material return, direct warehousing, or allowing material into the warehousing, and the warehousing receiving record does not show full warehousing protection for fines ore, a receiving result of waiting in front of the warehousing is generated.

[0021] Write the receiving results into the reverse return record, write the content of the bottom discharge gate action involved in the receiving results into the forward feeding record, and write the content of the fine ore bin receiving involved in the receiving results into the bin receiving record.

[0022] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the following includes: continuously feeding batches directly into the bin, feeding batches after allowing material to enter the bin, waiting batches before entering the bin, and stopping the addition of new batches for returning material. When the received result is direct entry into the silo, the control separator maintains material feeding, the first cleaning component allows material to enter, the second conveyor belt runs continuously, the bottom discharge gate of the silo remains closed, and the control of the second cleaning component performs the silo entry action.

[0023] When the receiving result indicates that the material should be allowed to enter the silo, the control separator stops adding new material and the first cleaning component pauses the feeding. The control gate at the bottom of the silo reduces its opening until the weighing value at the bottom of the silo is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device. The control belt continues to transport the already formed reverse return batch and the control component performs the silo entry action.

[0024] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the method further includes: continuously feeding batches directly into the bin, feeding batches after feeding them into the bin, feeding batches before they arrive into the bin, and stopping the addition of new batches of returned material. When the received result is "waiting before arrival at the warehouse", the control separator stops adding new material, the first cleaning component pauses importing, and the reverse return batch that has formed the expected arrival time at the warehouse is transported to the waiting position in front of the return port on the top of the warehouse and then the conveyor stops waiting.

[0025] When the material is being released from the bottom discharge gate of the silo, the bottom discharge gate continues to reduce its opening until the bottom discharge weighing value is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device. The second conveyor belt is then controlled to resume operation, and the second cleaning component is controlled to perform the silo entry action.

[0026] If a batch waiting to be stored in the warehouse is not completed within the current control cycle, the batch waiting to be stored in the warehouse will be retained as an unclosed reverse return batch.

[0027] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the method further includes: continuously feeding batches directly into the bin, feeding batches after feeding them into the bin, feeding batches before they arrive into the bin, and stopping the addition of new batches of returned material. When the received result indicates that new return material is prohibited, the control separator stops feeding material, the first cleaning component pauses importing, and the second conveyor belt stops receiving new batches of reverse return material.

[0028] When the second conveyor belt has already carried material, and the powder ore bin is ready to receive material, there is no blockage at the top return port of the bin, the second cleaning component does not record an abnormal entry into the bin, the second conveyor belt does not record slippage, and the second conveyor belt does not record deviation, control the second conveyor belt to discharge the already carried material into the powder ore bin, and control the second cleaning component to perform the entry into the bin action.

[0029] When the material already loaded is not discharged into the ore powder bin, the material already loaded is retained as an unclosed reverse return batch.

[0030] As a preferred embodiment of the material reverse conveying control method for the feed belt of the fine ore bin across the grinding and flotation workshop described in this invention, the steps for confirming the closure of the reverse material return execution record based on the weighing changes of the second conveyor belt, the confirmation of material falling from the top of the bin, the changes in the material level of the fine ore bin, the weighing value of material discharged from the bottom of the bin, and the changes in the feed of the grinding and flotation workshop are as follows: The closed confirmation period is determined according to the reverse return material batch number. Within the closed confirmation period, the quality of the return material discharged from the second conveyor belt to the fine ore bin, the receiving quality caused by the change in the material level of the fine ore bin, the quality of the material discharged from the bottom of the bin, and the change in the feed of the grinding and flotation workshop are determined. The change in the feed of the grinding and flotation workshop is used to determine the change in the feed demand of the grinding and flotation workshop within the closed confirmation period. When the weighing value of the material discharged from the bottom of the bin exceeds the no-load allowable error specified in the valid verification certificate or calibration certificate of the weighing device of the bottom of the bin, it is confirmed that the bottom discharge gate of the bin participates in the discharge and the change in the feed of the grinding and flotation workshop.

[0031] The mass of the returned material discharged into the fine ore bin by the second conveyor belt is compared with the sum of the mass of the material received due to the change in the material level in the fine ore bin and the mass of the material discharged from the bottom of the bin. The mass closure or non-closure is determined by summing the absolute value of the comparison difference with the allowable error stated in the valid verification or calibration certificate of the weighing device of the second conveyor belt, the allowable error stated in the valid verification or calibration certificate of the weighing device of the material discharged from the bottom of the bin, the allowable error stated in the valid verification or calibration certificate of the material level gauge of the fine ore bin, the mass error determined by the geometric dimensions of the fine ore bin and the bulk density of the gold ore fines.

[0032] As a preferred embodiment of the material reverse conveying control method for the feed belt of the powder ore bin across the grinding and flotation workshop described in this invention, the specific steps for obtaining the closing results of return material closure, return material retention, return material conflict with the bottom discharge of the bin or corresponding abnormality of the bin entry, and writing them into the forward feeding record, reverse return material record and bin receiving record are as follows: When the weighing value of the second conveyor belt near the ore powder bin does not decrease, or when the weighing value of the second conveyor belt near the ore powder bin decreases but there is no confirmation of material dropping from the top of the bin in the reverse material return execution record, a closed result of material return retention is generated.

[0033] When there is a confirmation of material dropping from the top of the silo in the reverse material return execution record, and the weighing value of material discharged from the bottom of the silo exceeds the no-load allowable error specified in the valid verification certificate or calibration certificate of the bottom material discharge weighing device during the closed confirmation period, a closed result of the conflict between material return and bottom material discharge is generated.

[0034] When the reverse material return execution record contains confirmation of material dropping from the top of the silo, a decrease in the weighing value of the second conveyor belt near the powder ore silo, failure to meet the judgment conditions of material return retention and conflict between material return and material discharge from the bottom of the silo, and the record is recorded as a quality non-closure, a closure result corresponding to the silo entry abnormality is generated, and the second cleaning component not being executed, the second cleaning component action feedback being abnormal, or the second cleaning component action feedback being missing are written as abnormal reasons into the reverse material return record and the silo receiving record.

[0035] When the weighing value of the second conveyor belt near the powder ore bin decreases, the reverse material return execution record shows confirmation of material falling from the top of the bin, the powder ore bin material level increases, and the quality closure has been recorded, and the weighing value of the bottom discharge of the bin is within the no-load allowable error specified in the valid verification certificate or calibration certificate of the bottom discharge weighing device during the closure confirmation period, the closure result of the material return closure is generated.

[0036] Write the closure result into the reverse return record, write the content involving the action of the bottom discharge gate into the forward feeding record, and write the content involving the receiving of powder ore into the silo receiving record.

[0037] The beneficial effects of this invention are as follows: by determining the reverse material return batch and the expected arrival time in the warehouse based on the reverse material return record, the invention generates receiving results such as direct entry into the warehouse, material entry into the warehouse, waiting before arrival in the warehouse, or prohibition of new material return, thereby achieving unified receiving and judgment of reverse material return batches, material entry through the bottom discharge gate of the warehouse, and material feeding requirements of the grinding and floating workshop. By confirming the closure of the reverse material return execution record, the invention distinguishes between material return closure, material return retention, material return conflict with bottom discharge of the warehouse, or abnormal entry into the warehouse, thereby reducing timing conflicts and improving the reliability of reverse material return batch closure. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart of a method for controlling the reverse material transport of a feed belt across a grinding and flotation workshop in a fine ore bin.

[0040] Figure 2 A flowchart for determining the batches of reverse-returned materials and their expected arrival time at the warehouse.

[0041] Figure 3 A flowchart is created to illustrate the process of receiving, generating, and executing results.

[0042] Figure 4 This is a flowchart for confirming the closure of the reverse material return execution record.

[0043] Figure 5 This chart compares the number of conflicts between material return and bottom discharge.

[0044] Figure 6 This is a comparison chart of the batch closure rate of reverse material return. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0048] Reference Figures 1-6 This is one embodiment of the present invention, which provides a method for controlling the reverse conveying of materials across a grinding and flotation workshop using a feed belt in a powder ore bin, comprising the following steps: S1. Collect data on the material level in the ore bin, the return port at the top of the bin, the discharge gate at the bottom of the bin, the material status on the first conveyor belt, the feeding requirements of the grinding and flotation workshop, the status of the separator, the second conveyor belt, the first cleaning component, and the second cleaning component, and generate positive feeding records, reverse return records, and bin receiving records.

[0049] At the beginning of each control cycle, based on the same acquisition time, the following data are read: ore silo level, ore silo full protection signal, silo top return port open signal, silo top return port closed signal, silo top return port blockage signal, silo bottom discharge gate opening, silo bottom discharge gate open signal, silo bottom discharge gate closed signal, silo bottom discharge weighing value, first conveyor belt start / stop status, first conveyor belt speed, first conveyor belt weighing value, grinding and flotation workshop feeding requirements, separator guiding status, unqualified gold ore powder entering the second conveyor belt, first cleaning component introduction status, second conveyor belt start / stop status, second conveyor belt speed, second conveyor belt weighing value, second conveyor belt slippage signal, second conveyor belt deviation signal, second cleaning component entry status, second cleaning component action feedback, second conveyor belt weighing value near the ore silo end, installation distance between the first conveyor belt weighing position and the grinding and flotation workshop feeding inlet, and installation distance between the second conveyor belt introduction position and the silo top return port.

[0050] Within the same control cycle, the weighing values ​​of the first conveyor belt, the second conveyor belt, the weighing value of the second conveyor belt near the powder ore bin, and the weighing value of the bottom discharge are all recorded with data type, measuring point location, unit of measurement, collection time interval, and cumulative mass conversion rules. The weighing value of the first conveyor belt is used to determine the amount of material on the first conveyor belt, the weighing value of the second conveyor belt is used to determine the start and end of the reverse return batch, the weighing value of the second conveyor belt near the powder ore bin is used to confirm the top discharge of the bin and the mass of the return material discharged into the powder ore bin by the second conveyor belt, and the weighing value of the bottom discharge is used to determine the action status of the bottom discharge gate and the mass of the bottom discharge. The weighing values ​​of different measuring points are written into the corresponding records.

[0051] Based on the ore powder silo level, ore powder silo full protection signal, silo top return port open signal, silo top return port closed signal, and silo top return port blockage signal, the initial state of the silo receiving side is determined. When the ore powder silo level does not trigger the ore powder silo full protection signal, the silo top return port is open, and there is no blockage signal at the silo top return port, it is recorded as the ore powder silo is ready to receive material. When the ore powder silo level triggers the ore powder silo full protection signal, it is recorded as the ore powder silo is full. When the silo top return port... If the material inlet is neither fully open nor fully closed, or if the top material return inlet of the silo is both fully open and fully closed simultaneously, or if a blockage signal appears at the top material return inlet, record it as "the top material return inlet needs to be checked." If the top material return inlet is fully closed and there is no blockage signal, record it as "the top material return inlet is closed and awaiting opening." Write the material level in the fine ore silo, the opening and closing status of the top material return inlet, the blockage status of the top material return inlet, the full protection status of the fine ore silo, and the time of data collection into the silo receiving record.

[0052] Based on the opening degree of the bottom discharge gate, the bottom discharge gate opening position signal, the bottom discharge gate closing position signal, and the bottom discharge weighing value, the original state of the bottom discharge side is determined. When the bottom discharge gate opening degree decreases relative to the bottom discharge gate opening degree in the positive feeding record of the previous control cycle, and the bottom discharge weighing value falls back to within the no-load allowable error specified in the valid verification certificate or calibration certificate, it is recorded as the bottom discharge gate opening degree is within acceptable limits. When feeding material, if the conditions for recording that the bottom discharge gate is feeding material are not met, and the bottom discharge weighing value exceeds the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device, it is recorded as the bottom discharge gate is discharging material. When the bottom discharge gate is closed and the bottom discharge weighing value is within the no-load allowable error, it is recorded as the bottom discharge gate is closed. The opening degree of the bottom discharge gate, the bottom discharge weighing value, the action status of the bottom discharge gate and the acquisition time are simultaneously written into the positive feeding record and the silo receiving record.

[0053] Based on the start / stop status of the first conveyor belt, the belt speed of the first conveyor belt, the weighing value of the first conveyor belt, the installation distance between the weighing position of the first conveyor belt and the feeding inlet of the grinding and flotation workshop, and the feeding requirements of the grinding and flotation workshop, the material status of the first conveyor belt is determined. When the first conveyor belt is running, the conveying direction of the first conveyor belt is pointing towards the feeding inlet of the grinding and flotation workshop, and the weighing value of the first conveyor belt exceeds the no-load allowable error specified in the valid verification certificate or calibration certificate of the first conveyor belt weighing device, it is recorded that there is material on the first conveyor belt. When the first conveyor belt is stopped, or the weighing value of the first conveyor belt is within the no-load allowable error, it is recorded that there is no material on the first conveyor belt. The material status of the first conveyor belt, the belt speed of the first conveyor belt, the weighing value of the first conveyor belt, the feeding requirements of the grinding and flotation workshop, the installation distance between the weighing position of the first conveyor belt and the feeding inlet of the grinding and flotation workshop, and the collection time are written into the positive feeding record.

[0054] Based on the material guiding status of the separator, the signal indicating that substandard gold ore powder is entering the second conveyor belt, the guiding status of the first cleaning component, the start / stop status of the second conveyor belt, the belt speed of the second conveyor belt, the weighing value of the second conveyor belt, the slippage signal of the second conveyor belt, the deviation signal of the second conveyor belt, and the installation distance between the guiding position of the second conveyor belt and the return port at the top of the silo, the original state of the reverse return side is determined. When the separator is in the material guiding state and the signal indicating that substandard gold ore powder is entering the second conveyor belt exists, it is recorded as the separator is guiding material. When the separator is not guiding substandard gold ore powder into the second conveyor belt, it is recorded as the separator is stopping material guiding. When the first cleaning component is guiding residual ore powder from the first conveyor belt into the second conveyor belt, it is recorded as the first cleaning component is guiding material. When the first cleaning component is not guiding residual ore powder into the second conveyor belt, it is recorded as the first cleaning component is guiding material. When residual mineral powder is introduced, it is recorded as the first cleaning component pausing its introduction. When the second conveyor belt is running, the weighing value of the second conveyor belt exceeds the no-load allowable error specified in the valid verification or calibration certificate of the second conveyor belt weighing device, and there are no slippage or deviation signals, it is recorded as the second conveyor belt is conveying. When the second conveyor belt is carrying material but stops, it is recorded as the second conveyor belt is waiting with material. When there is a slippage signal on the second conveyor belt, it is recorded as the second conveyor belt slipping. When there is a deviation signal on the second conveyor belt, it is recorded as the second conveyor belt deviating. The material guiding status of the separator, the introduction status of the first cleaning component, the status of the second conveyor belt, the belt speed of the second conveyor belt, the weighing value of the second conveyor belt, the installation distance between the introduction position of the second conveyor belt and the return port on the top of the silo, and the collection time are written into the reverse return record.

[0055] Based on the feedback from the second cleaning component's actions, the blockage signal at the top return port of the silo, the weighing changes at the end of the second conveyor belt near the ore powder silo, and the changes in the ore powder silo level, the initial state of the second cleaning component's entry side is determined. After the second cleaning component performs the cleaning action, if there is no blockage signal at the top return port of the silo, the weighing value at the end of the second conveyor belt near the ore powder silo decreases compared to the weighing value at the end of the second conveyor belt near the ore powder silo in the reverse return record of the previous control cycle, and the ore powder silo level increases compared to the silo receiving record of the previous control cycle, and the increase exceeds the allowable error specified in the ore powder silo level gauge in the valid verification or calibration certificate, it is recorded as normal entry of the second cleaning component into the silo. After the second cleaning component performs the cleaning action... When a blockage signal appears at the top return port of the silo, or when the weighing value of the second conveyor belt near the ore powder silo decreases compared to the weighing value of the second conveyor belt near the ore powder silo in the reverse return record of the previous control cycle, but the ore powder silo level does not increase compared to the silo body receiving record of the previous control cycle, or the increase does not exceed the allowable error specified in the valid verification or calibration certificate of the ore powder silo level gauge, it is recorded as an abnormality in the entry of the second cleaning component into the silo. The original state of the second cleaning component entering the silo, the blockage status of the top return port, the weighing change of the second conveyor belt near the ore powder silo, the ore powder silo level and the collection time are written into the silo body receiving record, and the original state of the second cleaning component entering the silo is written into the reverse return record.

[0056] After the status is written, the three types of records are organized according to the material flow direction. The status fields of the forward feeding record, reverse return record and bin receiving record are archived without duplication. The forward feeding record records the material receiving relationship between the bottom discharge end of the powder ore bin, the bottom discharge gate of the bin, the material status of the first conveyor belt and the feeding requirements of the grinding and flotation workshop. The reverse return record records the material import relationship between the separator, the first cleaning component, the second conveyor belt and the second cleaning component. The bin receiving record records the receiving relationship between the top return port of the bin, the material level of the powder ore bin, the entry status of the second cleaning component, the bottom discharge gate of the bin and the bottom discharge weighing value.

[0057] S2. Based on the reverse return material record, determine the reverse return material batch and the expected arrival time in the warehouse. Based on the warehouse receiving record, forward feeding record, the material status on the first conveyor belt and the feeding requirements of the grinding and floating workshop, generate the receiving results of direct entry into the warehouse, allowing material to enter the warehouse, waiting before arrival in the warehouse or prohibiting new return materials.

[0058] Based on the silo receiving record and reverse return record, it is determined whether there is a situation where new return is prohibited. When there is an unclosed reverse return batch in the reverse return record of the previous control cycle, the unclosed reverse return batch of the previous control cycle is first merged into the reverse return record of the current control cycle, and then the receiving result is judged. When the silo receiving record shows that the powder silo is full, the silo top return port is blocked, or the second cleaning component enters the silo abnormally, or the reverse return record shows that the second conveyor belt is slipping or the second conveyor belt is off-center, a receiving result prohibiting new return is generated. The receiving result prohibiting new return is written with the execution content of triggering reason, separation component stopping material feeding, first cleaning component pausing import, and second conveyor belt stopping receiving new reverse return batches. When the second conveyor belt is already carrying material, the receiving result prohibiting new return is also written with the content of the already carried material to be processed.

[0059] When no receiving result prohibiting new material return is generated, reverse material return batches are divided based on the reverse material return records. The change in the weighing value of the second conveyor belt relative to the no-load allowable error specified in the valid verification or calibration certificate of the second conveyor belt weighing device is used as the basis for the start and end of the batch. When the weighing value of the second conveyor belt changes from within the no-load allowable error to exceed the no-load allowable error, it is recorded as the front end of the reverse material return batch entering the second conveyor belt. When the weighing value of the second conveyor belt changes from exceeding the no-load allowable error back to within the no-load allowable error, it is recorded as the rear end of the reverse material return batch entering the second conveyor belt. When the unqualified gold ore powder introduced by the separator and the residual ore powder introduced by the first cleaning component continuously enter the second conveyor belt before the weighing value of the second conveyor belt falls back to within the no-load allowable error, they are classified into the same reverse material return batch. When the load falls back to within the allowable error of no-load and then exceeds the allowable error of no-load again, a new reverse return batch is formed. When the reverse return batch has formed the expected arrival time in the warehouse and generated a receiving result, the unqualified gold ore powder entering the second conveyor belt or the residual ore powder in the first conveyor belt will not be included in the reverse return batch that has generated a receiving result. If the weighing value of the second conveyor belt does not fall back to within the allowable error of no-load and the front end of the reverse return batch cannot be distinguished, the control separator will stop adding new material and the first cleaning component will pause the import until the back end of the current reverse return batch enters the second conveyor belt and forms the expected arrival time in the warehouse. When no reverse return batch is formed and there is no reverse return batch that was not closed in the previous control cycle, the reverse return record is written with the content of no return batch, and the current control cycle will not generate a receiving result of direct entry into the warehouse, material entry into the warehouse, or waiting before arrival in the warehouse.

[0060] After the reverse return batch is formed, the estimated arrival time at the silo is determined based on the belt speed of the second conveyor belt, the installation distance between the second conveyor belt inlet position and the return port at the top of the silo, expressed as: ; ; in, Indicates the batch number of the reverse material return. Indicates the first The moment when the front end of the reverse return batch enters the second conveyor belt. Indicates the first The estimated time when the front end of the reverse return batch arrives at the return port on the top of the silo. Indicates the time of the second conveyor belt The actual belt speed This indicates the installation distance between the second conveyor belt inlet position and the return port on the top of the silo. Indicates the first The estimated time when the reverse return batch arrives at the return port on the top of the silo. Indicates the first The moment when the reverse return batch enters the second conveyor belt.

[0061] When the cumulative conveying distance of the second conveyor belt does not reach the installation distance between the second conveyor belt inlet and the top return port of the bin, the estimated arrival time is not generated. When the second conveyor belt stops, slips, deviates, or loses speed, the estimated arrival time is paused and updated, and the accumulated conveying distance, stop time, resumption time, or abnormal status is written into the reverse return record.

[0062] After obtaining the estimated arrival time at the warehouse, the system determines whether the material carried by the first conveyor belt can meet the feeding demand of the grinding and flotation workshop during the discharge gate's clearance period at the bottom of the warehouse, based on the forward feeding records. The estimated time period for the material carried by the first conveyor belt to enter the grinding and flotation workshop's feeding inlet is determined based on the first conveyor belt speed and the installation distance between the first conveyor belt's weighing position and the grinding and flotation workshop's feeding inlet. The amount of material carried by the first conveyor belt is determined by the cumulative mass of material that can reach the grinding and flotation workshop's feeding inlet before the end of the estimated arrival time at the warehouse. For each data collection moment, the system considers the installation distance between the first conveyor belt's weighing position and the grinding and flotation workshop's feeding inlet, as well as the first conveyor belt speed. Determine the estimated arrival time of the material at the weighing position of the first conveyor belt at the current sampling time to the feed inlet of the grinding and flotation workshop. If the estimated arrival time is not later than the estimated end time of the storage period, the material corresponding to the current sampling time is included in the material quantity on the first conveyor belt. If the first conveyor belt weighing value is the cumulative mass reading, the increase in the cumulative mass reading between adjacent sampling times is included in the material quantity on the first conveyor belt. If the first conveyor belt weighing value is the mass flow rate, the product of the mass flow rate and the sampling time interval is included in the material quantity on the first conveyor belt. If the first conveyor belt weighing value is the unit length load, the product of the unit length load and the first conveyor belt weight is included in the material quantity on the first conveyor belt. The product of the conveyor belt speed and the sampling time interval is included in the material quantity on the first conveyor belt. The material mass corresponding to each sampling time with an expected arrival time no later than the expected end of the warehouse arrival period is accumulated to obtain the material quantity on the first conveyor belt that can enter the feeding inlet of the grinding and flotation workshop before the expected end of the warehouse arrival period. This material quantity is then compared with the feeding demand of the grinding and flotation workshop determined according to the cumulative mass within the same time period. The feeding demand of the grinding and flotation workshop is determined according to the cumulative demand mass within the same time period before the expected end of the warehouse arrival period. When the material quantity on the first conveyor belt is not less than... When the material quantity carried by the first conveyor belt is less than the material quantity required by the grinding and flotation workshop, but the difference does not exceed the sum of the permissible error mass specified in the valid verification or calibration certificate of the weighing device of the first conveyor belt and the feeding and metering device of the grinding and flotation workshop, it is recorded as the first conveyor belt being able to meet the material quantity required by the grinding and flotation workshop. When the material quantity carried by the first conveyor belt is less than the material quantity required by the grinding and flotation workshop, and the difference exceeds the sum of the permissible error mass specified in the valid verification or calibration certificate of the weighing device of the first conveyor belt and the feeding and metering device of the grinding and flotation workshop, it is recorded as the first conveyor belt being unable to meet the material quantity required by the grinding and flotation workshop.

[0063] After completing the reverse material return batch, the estimated arrival time in the warehouse, and the material acceptance judgment of the first conveyor belt, the receiving results are generated in the following order: prohibiting new material return, direct entry into the warehouse, allowing material into the warehouse, and waiting before arrival in the warehouse. When the receiving result of prohibiting new material return has been generated, the receiving results of direct entry into the warehouse, allowing material into the warehouse, or waiting before arrival in the warehouse will no longer be generated. When the warehouse receiving record shows that the powder ore warehouse is ready to receive material, the reverse material return record shows that the second conveyor belt is conveying, the forward feeding record shows that the bottom discharge gate of the warehouse is closed, and the estimated arrival time in the warehouse has been formed, the receiving result of direct entry into the warehouse is generated. The receiving result of direct entry into the warehouse is written with the reverse material return batch number, the estimated arrival time in the warehouse, the separation component continues to guide material, the first cleaning component allows import, the second conveyor belt runs continuously, and the bottom discharge gate of the warehouse remains closed.

[0064] When the bin receiving record shows that the powder ore bin is ready to receive material, the reverse return record shows that the second conveyor belt is conveying material, and the forward feeding record shows that the bottom discharge gate of the bin is discharging material, the expected arrival time of the bin has been formed, and the first conveyor belt can meet the feeding needs of the grinding and flotation workshop, a receiving result for allowing material into the bin is generated. The receiving result for allowing material into the bin is written with the reverse return batch number, the expected arrival time of the bin, the separation component stops adding new material, the first cleaning component pauses the introduction, the bottom discharge gate of the bin allows material, the second conveyor belt continues to convey the formed reverse return batch, and the execution content of the first conveyor belt meeting the feeding needs of the grinding and flotation workshop.

[0065] When no receiving result is generated prohibiting new material return, direct warehousing, or allowing material into the warehousing, and the warehousing receiving record does not show full warehousing protection for the fine ore silo, a receiving result for waiting before warehousing is generated. This waiting result includes the reverse material return batch number, the reason for the already formed expected arrival time or the reason for the not yet formed expected arrival time, the separation unit stopping new material feeding, the first cleaning component pausing import, and the second conveyor belt retaining the already formed reverse material return batch at the waiting position before the warehousing top return port. When the waiting result for waiting before warehousing is triggered by the first conveyor belt when the material cannot meet the feeding demand of the grinding and flotation workshop, the warehousing bottom discharge gate temporarily stops allowing material. When the receiving result is triggered by the bottom discharge gate of the silo being allowed to discharge material, the bottom discharge gate of the silo continues to discharge material. When the receiving result of the waiting period before the silo is triggered by the top return port of the silo being closed and waiting to open, the top return port of the silo needing to be verified and there is no blockage at the top return port of the silo, or the second conveyor belt carrying material waiting or not yet forming the expected arrival time of the silo, the bottom discharge gate of the silo remains in its current operating state. The receiving result of the waiting period before the silo is triggered when the top return port of the silo is closed and waiting to open, the top return port of the silo needs to be verified and there is no blockage at the top return port of the silo, the bottom discharge gate of the silo is allowing material to discharge material, the second conveyor belt carrying material waiting, the expected arrival time of the silo not yet forming, or the first conveyor belt carrying material cannot meet the feeding needs of the grinding and floating workshop.

[0066] After generating the receiving results for direct feeding, feeding into the silo, waiting before the silo, or prohibiting new material return, the receiving results are written into the reverse material return record. The content of the bottom discharge gate action involved in the receiving results is written into the forward feeding record. The content of the fine ore silo receiving involved in the receiving results is written into the silo body receiving record.

[0067] S3. Based on the received results, the linkage control of the separator guide, the second conveyor belt runs, the first cleaning component imports, the second cleaning component enters the silo and the bottom discharge gate of the silo is activated. The batches that directly enter the silo are continuously entered into the silo, the batches that allow material to enter the silo are allowed to enter the silo after material is allowed to enter the silo, the batches that wait before entering the silo are waited to enter the silo after waiting, and the batches that are prohibited from adding new return materials are stopped from adding new imports, thus forming a reverse return material execution record.

[0068] Based on the received results, the linkage control of the separator guides the material, the second conveyor belt runs, the first cleaning component is introduced, the second cleaning component enters the silo, and the bottom discharge gate of the silo is activated. The weighing value of the second conveyor belt near the powder ore silo is used as the weighing value before execution. During the execution phase, the received results are not regenerated. Only the corresponding actions are executed according to the received results of direct entry into the silo, letting the material into the silo, waiting in front of the silo, or prohibiting the addition of new material return. The execution process is written into the reverse material return execution record.

[0069] When the top return port of the silo is fully open and there is no blockage signal at the top return port, the weighing value of the second conveyor belt near the powder ore silo decreases compared to the weighing value before execution, and the powder ore silo level at the subsequent collection time increases compared to the powder ore silo level before execution and exceeds the allowable error specified in the valid verification or calibration certificate of the powder ore silo level gauge, it is recorded as a confirmation of material dropping from the top of the silo. If the conditions of the top return port being fully open, no blockage signal at the top return port, a decrease in the weighing value of the second conveyor belt near the powder ore silo, and an increase in the powder ore silo level are not met simultaneously, the confirmation of material dropping from the top of the silo is not recorded.

[0070] When the receiving result indicates direct entry into the silo, the separation unit is controlled to maintain the guiding material, allowing unqualified gold ore powder to continue entering the second conveyor belt. The first cleaning component is controlled to maintain the allowable inflow, allowing residual ore powder from the first conveyor belt to continue entering the second conveyor belt. The separation unit maintaining the guiding material and the first cleaning component allowing the inflow do not change the boundary of the reverse return batch that has already generated the receiving result. The second conveyor belt is controlled to run continuously at the second conveyor belt speed in the reverse return record, allowing the formed reverse return batch to cross the grinding and flotation workshop and enter the top return port of the silo. The bottom discharge gate of the silo is controlled to remain closed during the expected arrival time, preventing the discharge into the second conveyor belt. A new bottom discharge of fine ore from a conveyor belt is added. The second cleaning component is controlled to perform an infeed action at the end of the second conveyor belt near the fine ore bin, so that the residual ore powder at the end of the second conveyor belt near the fine ore bin enters the fine ore bin. The top discharge confirmation of the direct infeed batch is recorded according to the bin top discharge confirmation rules. After the direct infeed batch enters the bin top return port, the reverse return batch number, the expected arrival time, the separation component continues to guide the material, the first cleaning component is allowed to enter, the second conveyor belt runs continuously, the second cleaning component enters the bin, the bottom discharge gate of the bin remains closed, the bin top discharge confirmation and the collection time are written into the direct infeed execution record.

[0071] When the receiving result indicates material is being allowed into the silo, the separation unit stops adding new material, preventing new substandard gold ore powder from entering the second conveyor belt. Simultaneously, the first cleaning component pauses its feeding, preventing new residual ore powder from entering the second conveyor belt. The bottom discharge gate reduces its opening until the bottom discharge weighing value is within the no-load allowable error specified in the valid verification or calibration certificate. The bottom discharge gate's operation status is recorded as "material allowance complete." After the bottom discharge gate completes material allowance, the second conveyor belt continues conveying the already formed reverse return batch, allowing the batch to enter the top return port of the silo. The second cleaning component performs the silo entry action at the end of the second conveyor belt near the powder ore silo. It records the silo top material drop confirmation of the batch of material entering the silo according to the silo top material drop confirmation rules. After the batch of material entering the silo top return port, the silo bottom discharge gate does not directly resume discharge within the same control cycle. The reverse return batch number, the expected arrival time in the silo, the separation component stops adding new material, the first cleaning component pauses the introduction, the silo bottom discharge gate completes the material drop, the second conveyor belt continues to transport the already formed reverse return batch, the first conveyor belt receives the material from the grinding and flotation workshop, the second cleaning component enters the silo, the silo top material drop confirmation and collection time are written into the material entry execution record.

[0072] When the received result indicates waiting before the silo, the control separator stops adding new material, and the first cleaning component pauses its introduction. This prevents new unqualified gold ore powder and new residual ore powder from the first conveyor belt from entering the second conveyor belt. For reverse return batches that have already formed the expected arrival time at the silo, the control of the second conveyor belt transports the formed reverse return batches to the waiting position before the return port at the top of the silo and then stops the belt. The waiting position before the return port at the top of the silo is determined by a safety advance distance, which is the sum of the material displacement distance within the sampling time interval, the braking distance of the second conveyor belt, and the material inertial displacement distance. The material displacement distance within the sampling time interval is determined based on the belt speed of the second conveyor belt and the time interval between adjacent sampling moments. The braking distance of the second conveyor belt is determined based on the actual running distance of the second conveyor belt from receiving the stop control command until the belt speed of the second conveyor belt drops to zero. The material inertial displacement distance is based on the relative displacement of similar gold ore powder after the second conveyor belt stops. The calibration distance for the second conveyor belt to continue moving forward is determined. For similar gold ore powders, the calibration distance is determined based on the particle size range, moisture range, second conveyor belt speed range, second conveyor belt inclination angle range, and second conveyor belt load status. When the particle size range, moisture range, second conveyor belt speed, second conveyor belt inclination angle, or load status of the current reverse return batch exceeds the calibration conditions, the material inertial displacement distance is recalibrated, or the safety advance distance is determined based on the already calibrated maximum material inertial displacement distance. The inlet of the silo top return port drop section is used as the position reference, and the safety advance distance is measured along the direction of the second conveyor belt's introduction position. The center line position of the idler roller that does not enter the safe advance distance range and is closest to the inlet of the silo top return port drop section is determined as the waiting position before the silo top return port. This ensures that the front end of the reverse return batch does not enter the silo top return port drop section after the second conveyor belt stops. For reverse return batches that have not yet formed the expected arrival time in the silo, the second conveyor belt remains carrying material and waits, without conveying to the silo top return port.

[0073] When the material carried by the first conveyor belt cannot meet the feeding demand of the grinding and flotation workshop, the discharge gate at the bottom of the silo maintains its current discharge action, and the second conveyor belt continues to carry material and wait. When the positive feeding record of the next control cycle shows that the material carried by the first conveyor belt can meet the feeding demand of the grinding and flotation workshop, and the silo receiving record shows that the powder silo has the conditions for receiving material, the receiving result will be regenerated in the next control cycle and then executed according to the receiving result generated in the next control cycle. It will not be forcibly put into the silo in the current control cycle.

[0074] When the material is being discharged from the bottom of the silo, the bottom discharge gate continues to reduce its opening until the weighing value of the material discharged from the bottom of the silo is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device. After the bottom discharge gate completes the material discharge, the second conveyor belt is controlled to resume operation, allowing the already formed reverse return batch to enter the top return port of the silo, and the second cleaning component is controlled to perform the silo entry action.

[0075] When the material is waiting to be returned to the bin from the top of the bin, the second conveyor belt continues to carry material and waits. The bottom discharge gate of the bin remains in its current operating state. When the bin receiving record of the next control cycle shows that the powder ore bin is ready to receive material, the receiving result will be regenerated in the next control cycle and then executed according to the receiving result generated in the next control cycle. The material will not be forcibly put into the bin in the current control cycle.

[0076] When the material needs to be checked at the top return port of the silo and there is no blockage at the top return port, the second conveyor belt continues to carry material and waits. The bottom discharge gate of the silo remains in its current operating state. When the silo receiving record of the next control cycle shows that the powder ore silo has the conditions for receiving material, the receiving result will be regenerated in the next control cycle and then executed according to the receiving result generated in the next control cycle. It will not be forced into the silo in the current control cycle.

[0077] When the material is waiting to be delivered to the silo by the second conveyor belt or when the expected delivery time has not yet been triggered, the second conveyor belt continues to carry material and waits. The discharge gate at the bottom of the silo remains in its current operating state. When the expected delivery time is recorded in the reverse return material record of the next control cycle, and the silo receiving record shows that the powder silo has the conditions to receive material, the receiving result will be regenerated in the next control cycle and then executed according to the receiving result generated in the next control cycle. The material will not be forcibly delivered to the silo in the current control cycle.

[0078] If the batch waiting to enter the silo resumes operation and enters the silo top return port within the current control cycle due to the completion of material discharge by the silo bottom discharge gate, the silo top drop confirmation is recorded according to the silo top drop confirmation rules. When the batch waiting to enter the silo is completed, the reverse return batch number, waiting trigger content, waiting position in front of the silo top return port, waiting with material on the second conveyor belt, operation status of the silo bottom discharge gate, resumption of operation of the second conveyor belt, entry of the second cleaning component into the silo, silo top drop confirmation, and collection time are written into the silo waiting execution record. If the batch waiting to enter the silo is not completed within the current control cycle, the reverse return batch number, waiting trigger content, waiting position in front of the silo top return port, waiting with material on the second conveyor belt, operation status of the silo bottom discharge gate, and collection time are written into the silo waiting execution record and retained as an unclosed reverse return batch.

[0079] When the receiving result indicates that new material return is prohibited, the separation component stops guiding material, the first cleaning component pauses its inlet feeding, and the second conveyor belt stops receiving new batches of reverse material return. When the receiving result indicating that new material return is prohibited is written into the pending processing content of the already loaded material, the receiving record of the ore powder bin, the blockage status of the top return port, the full ore powder bin protection status, and the original status of the second cleaning component's entry side are read. The reverse material return record also reads the slippage and deviation of the second conveyor belt. When the ore powder bin meets the receiving conditions, the blockage status of the top return port is not present, the second cleaning component does not record an entry abnormality, and the second conveyor belt does not record slippage or deviation, the second conveyor belt discharges the already loaded material into the ore powder bin, and the second cleaning component performs the entry action, recording the already loaded material according to the top material discharge confirmation rules. Material top discharge confirmation: When the powder ore silo is full, the top return port is blocked, the second cleaning component enters the silo abnormally, or the second conveyor belt slips or deviates, the second conveyor belt stops running and retains the trigger content of the powder ore silo full protection, the top return port is blocked, the second cleaning component enters the silo abnormally, or the second conveyor belt slips or deviates. The bottom discharge gate maintains the current action according to the feeding requirements of the grinding and floating workshop in the forward feeding record. The trigger reason, the separation component stops guiding material, the first cleaning component stops introducing material, the second conveyor belt stops receiving new material, the already loaded material is discharged into the powder ore silo or the second conveyor belt stops running, the second cleaning component enters the silo status, the bottom discharge gate action status and the collection time are written into the prohibition of adding new return material execution record. If the already loaded material is not discharged into the powder ore silo, the already loaded material is retained as an unclosed reverse return batch.

[0080] After completing the direct warehousing execution record, material feeding warehousing execution record, waiting before warehousing execution record, or prohibition of new material feeding execution record, these records will be merged into the reverse material feeding execution record. The reverse material feeding execution record records the reverse material feeding batch number, receiving result, separation component action, first cleaning component action, second conveyor belt action, second cleaning component action, silo bottom discharge gate action, silo top material discharge confirmation, powder ore silo material level acquisition time, and silo bottom discharge weighing value acquisition time. When there is an unclosed reverse material feeding batch, the reverse material feeding execution record will also record the unclosed reverse material feeding batch and the reason for the unclosed status.

[0081] Figure 5 and Figure 6The data comes from the reverse conveying control test records of the same fine ore bin feed belt. The reverse return batch samples are statistically analyzed by month. The conventional control method uses the status of the top return port of the bin, the running status of the second conveyor belt, and the basic safety interlock as the release basis. The method of this invention uses the reverse return batch, the expected arrival time of the bin, the receiving result, the reverse return execution record, and the closure result as the statistical basis. The number of conflicts between return and bottom discharge is counted according to the number of times that the weighing value of the same reverse return batch exceeds the no-load allowable error when the top discharge confirmation and the bottom discharge weighing value exceed the no-load allowable error during the closure confirmation period. The return closure rate is determined by the proportion of the number of reverse return batches that have closed to the total number of reverse return batches that have completed closure confirmation.

[0082] Depend on Figure 5 As can be seen, the horizontal axis represents the months of 2025, the vertical axis represents the number of conflicts between material return and bottom discharge, the bars represent the number of conflicts under conventional control and the present invention, and the line represents the reduction in conflicts. The conventional method had a higher number of conflicts in some months than the average monthly number of conflicts under the conventional control method throughout the year. This indicates that when reverse material return is released based solely on the status of the top return port or the operation status of the second conveyor belt, it is easy for the expected arrival time to overlap with the bottom discharge gate's discharge process. The present invention determines the reverse material return batch and the expected arrival time based on the reverse material return record, and combines the silo receiving record, forward feeding record, the material status on the first conveyor belt, and the feeding requirements of the grinding and flotation workshop to generate receiving results such as direct entry into the silo, allowing material into the silo, waiting before the material arrives at the silo, or prohibiting new material return. This creates a linkage control between the bottom discharge gate allowing material, the operation of the second conveyor belt, and the entry action of the second cleaning component. Figure 5 The peak value of the conflict reduction indicates that in months when conflicts are more concentrated using conventional methods, the method of this invention can reduce the occurrence of simultaneous return material entering the warehouse and material exiting the warehouse by allowing material to enter the warehouse and waiting before it arrives at the warehouse, thereby reducing timing conflicts.

[0083] S4. Based on the changes in weighing of the second conveyor belt, confirmation of material dropping from the top of the silo, changes in the material level of the fine ore silo, weighing value of material discharged from the bottom of the silo, and changes in feeding in the grinding and flotation workshop, perform a closed confirmation of the reverse material return execution record, obtain the closed results of material return closure, material return retention, material return conflict with material discharge from the bottom of the silo or abnormal material entering the silo, and write them into the forward feeding record, reverse material return record and silo body receiving record.

[0084] Based on the changes in weighing of the second conveyor belt, confirmation of material dropping from the top of the silo, changes in the material level of the fine ore silo, weighing values ​​of material discharged from the bottom of the silo, and changes in the feeding of the grinding and flotation workshop, the reverse material return execution record is closed and confirmed. The closure confirmation is carried out batch by batch according to the reverse material return batch number. For unclosed reverse material return batches, the reverse material return batch number in the reverse material return execution record is used, and the reverse material return batch number is not regenerated.

[0085] When the reverse material return execution record shows that the batch waiting to be returned to the silo has not been returned to the silo in the current control cycle, or the material already loaded in the prohibited new return batch has not been discharged into the fine ore silo, no quality closure judgment will be made. The reverse material return batch will continue to be retained as an unclosed reverse material return batch, and the reason for the unclosure will be written into the reverse material return record. The reasons for the unclosure include: the silo top return port is closed and waiting to be opened; the silo top return port needs to be checked; the second conveyor belt is waiting to carry material; the second conveyor belt is slipping; the second conveyor belt is running off-center; the fine ore silo is full protection; the second cleaning component is abnormally entering the silo; or the material on the first conveyor belt cannot meet the feeding requirements of the grinding and flotation workshop.

[0086] The collection time of the unclosed reverse return batch is used as the starting point for the unclosed timing. The unclosed waiting time is accumulated. The maximum allowable waiting time is determined based on the installation distance between the second conveyor belt inlet and the top return port of the silo, the minimum controllable belt speed of the second conveyor belt, the verification cycle of the top return port of the silo, and the safety interlock reset cycle. When the unclosed waiting time exceeds the maximum allowable waiting time, an overdue unclosed record is generated, triggering manual verification, shutdown for material clearing, or reassignment. New materials are prohibited from being included in the overdue unclosed reverse return batch.

[0087] The closure confirmation period is determined based on the reverse material return execution record. When the direct-entry batch and the material-feeding batch have already achieved silo top discharge confirmation, the start time of the closure confirmation period is the time when the weighing value of the second conveyor belt near the fine ore silo begins to decrease during the expected arrival time. The end time of the closure confirmation period is the time when the weighing value of the second conveyor belt near the fine ore silo falls back to within the no-load allowable error specified in the valid verification or calibration certificate of the second conveyor belt weighing device. When the direct-entry batch and the material-feeding batch have not achieved silo top discharge confirmation, the expected arrival time is used as the retention and verification period, and no quality closure judgment is performed. For batches waiting before arrival at the silo, the first sampling time after the second conveyor belt resumes operation is used as the closure confirmation time. The closing confirmation period begins when the weighing value of the second conveyor belt near the powder ore bin drops back to within the no-load allowable error specified in the valid verification or calibration certificate. When it is prohibited to discharge materials already loaded in the powder ore bin into the new batch of returned materials, the closing confirmation period begins when the second conveyor belt starts discharging into the powder ore bin, and ends when the weighing value of the second conveyor belt near the powder ore bin drops back to within the no-load allowable error. If the second conveyor belt has not resumed operation, the weighing value of the second conveyor belt near the powder ore bin has not decreased, the second conveyor belt is slipping, or the second conveyor belt is off-center, no quality closure judgment is made, and the process directly proceeds to the returned material retention judgment.

[0088] During the closed-loop confirmation period, the following are determined based on the reverse return material batch number: the mass of return material discharged from the second conveyor belt into the fine ore bin, the mass of material received due to changes in the fine ore bin level, the mass of material discharged from the bottom of the bin, and the change in feed from the grinding and flotation workshop. The mass of return material discharged from the second conveyor belt into the fine ore bin is determined by the cumulative mass within the same closed-loop confirmation period. When the weighing value at the end of the second conveyor belt near the fine ore bin is the cumulative mass reading, the difference between the cumulative mass reading at the end of the closed-loop confirmation period and the cumulative mass reading at the beginning of the closed-loop confirmation period is taken as the mass of return material discharged from the second conveyor belt into the fine ore bin. When the weighing value at the end of the second conveyor belt near the fine ore bin is the mass flow rate, the mass flow rate is determined according to the collection time interval. The mass flow rate within the confirmation period is accumulated to obtain the return material mass discharged by the second conveyor belt into the powder ore bin. When the weighing value of the second conveyor belt near the powder ore bin is the instantaneous load, the mass of material passing through each collection interval is first determined by combining the belt speed of the second conveyor belt and the collection time interval, and then accumulated to obtain the return material mass discharged by the second conveyor belt into the powder ore bin. When the weighing value of the second conveyor belt near the powder ore bin decreases multiple times due to continuous conveying within the closed confirmation period, the decrease in weighing value between adjacent collection times is calculated according to the collection sequence, and the decrease in weighing value of each time is accumulated to obtain the return material mass discharged by the second conveyor belt into the powder ore bin. The increase in weighing value is not included in the return material mass.

[0089] The receiving mass resulting from changes in the ore fines silo level is determined by the increase in the silo's internal volume due to the increase in ore fines silo level. The relationship between the ore fines silo level and its internal volume is established based on the silo's geometry. The silo's internal volume before the start of the closure confirmation period is obtained based on the ore fines silo level before the start of the closure confirmation period. The silo's internal volume after the end of the closure confirmation period is obtained based on the ore fines silo level after the end of the closure confirmation period. The difference between the silo's internal volume after the end of the closure confirmation period and the silo's internal volume before the start of the closure confirmation period is taken as the increase in the ore fines silo's internal volume. The product of this increase in internal volume and the bulk density of the gold ore fines is taken as the receiving mass resulting from the ore fines silo level change. The bulk density of the gold ore fines is determined by sampling and measuring the gold ore fines silo within the same silo. During sampling and measurement, the mass of the gold ore fines silo sample is weighed, and the volume of the gold ore fines silo sample under natural stacking conditions is measured. The ratio of the mass of the gold ore fines silo sample to its volume under natural stacking conditions is taken as the bulk density of the gold ore fines.

[0090] The bottom discharge mass is determined by the cumulative discharge mass formed by the bottom discharge weighing values ​​within the closed confirmation period. When the bottom discharge weighing value is the cumulative mass reading, the difference between the bottom discharge weighing value at the end of the closed confirmation period and the bottom discharge weighing value at the beginning of the closed confirmation period is taken as the bottom discharge mass. When the bottom discharge weighing value is the mass flow rate, the mass flow rate within the closed confirmation period is accumulated according to the collection time interval to obtain the bottom discharge mass. When the bottom discharge weighing value is the instantaneous load, the discharge mass within each collection interval is determined by combining the discharge duration and the collection time interval, and then accumulated as the bottom discharge mass. When the bottom discharge weighing value is the continuously collected discharge reading, the discharge increment between adjacent collection times is calculated according to the collection sequence, and the discharge increments within the closed confirmation period are accumulated as the bottom discharge mass. The changes in the feed of the grinding and flotation workshop are determined according to the feed demand of the grinding and flotation workshop at the start and end of the closed confirmation period and the material status on the first conveyor belt. When the feed demand of the grinding and flotation workshop increases during the closed confirmation period, and the bottom discharge weighing value exceeds the no-load allowable error specified in the valid verification certificate or calibration certificate of the bottom discharge weighing device, it is recorded as the bottom discharge gate participating in discharge during the closed confirmation period.

[0091] The quality error determined by the geometric dimensions of the ore powder bin and the bulk density of gold ore powder is determined based on the allowable error range of the ore powder bin level gauge, the change in internal volume of the ore powder bin within that range, and the bulk density of the gold ore powder. The upper and lower limits of the ore powder bin level are determined by combining the ore powder bin level before and after the closure confirmation period with the allowable error stated in the valid verification or calibration certificate of the ore powder bin level gauge. Then, the range of internal volume change between the upper and lower limits is determined based on the ore powder bin geometry. Finally, the product of this internal volume change range and the bulk density of the gold ore powder is taken as the quality error jointly determined by the allowable error of the ore powder bin level gauge, the ore powder bin geometry, and the bulk density of the gold ore powder.

[0092] The mass of the returned material discharged into the fine ore bin by the second conveyor belt is compared with the sum of the mass of the material received due to the change in the material level in the fine ore bin and the mass of the material discharged from the bottom of the bin. If the absolute value of the difference does not exceed the sum of the permissible error specified in the valid verification or calibration certificate of the second conveyor belt weighing device, the permissible error specified in the valid verification or calibration certificate of the bottom discharge weighing device, the permissible error specified in the valid verification or calibration certificate of the fine ore bin level gauge, and the mass error determined by the geometric dimensions of the fine ore bin and the bulk density of the gold ore fines, it is recorded as a closed mass. If the absolute value of the difference exceeds the sum of the permissible error specified in the valid verification or calibration certificate of the second conveyor belt weighing device, the permissible error specified in the valid verification or calibration certificate of the bottom discharge weighing device, the permissible error specified in the valid verification or calibration certificate of the fine ore bin level gauge, and the mass error determined by the geometric dimensions of the fine ore bin and the bulk density of the gold ore fines, it is recorded as a closed mass.

[0093] The closed result is generated in the order of material return retention, material return conflict with bottom discharge, abnormal material return, and material return closure.

[0094] When the second conveyor belt has already started operating, but the weighing value at the end of the second conveyor belt near the ore powder bin has not decreased, or the weighing value at the end of the second conveyor belt near the ore powder bin has decreased but there is no confirmation of material dropping from the top of the bin in the reverse material return execution record, a closed result of material return retention is generated. The closed result of material return retention is written into the reverse material return record, and the reverse material return batch is retained as an unclosed reverse material return batch. The closed result of material return retention is written into the bin receiving record, and the content of needing to verify the top of the bin return port or waiting for the second conveyor belt to carry material is written into the forward feeding record, so that the next control cycle will not generate a direct bin receiving result because the reverse material return batch has already started operating.

[0095] When the reverse material return execution record contains confirmation of material discharge from the top of the silo, and the weighing value of the material discharged from the bottom of the silo exceeds the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device during the closed confirmation period, and the receiving result falls under any of the following circumstances: direct entry into the silo, material feeding into the silo, material feeding into the silo after the pre-silo waiting batch has completed feeding, or material already loaded in the prohibited new material return batch has been discharged into the powder ore silo, a closed result of the conflict between material return and bottom discharge is generated. The closed result of the conflict between material return and bottom discharge is written into the forward feeding record, and... The next control cycle prioritizes the release of material from the bottom discharge gate of the silo. The closing result of the conflict between the return material and the bottom discharge is written into the silo receiving record and the fine ore silo receiving verification content. The closing result of the conflict between the return material and the bottom discharge is written into the reverse return material record, and the reverse return material batch is prohibited from being treated as a return material closure. When the change in the feed demand of the grinding and flotation workshop and the weighing value of the bottom discharge of the silo both exceed the no-load allowable error during the closure confirmation period, the change in the feed demand of the grinding and flotation workshop and the participation of the bottom discharge gate in the discharge content are written into the positive feed record at the same time.

[0096] When the reverse material return execution record shows confirmation of material dropping from the top of the silo, and the weighing value of the second conveyor belt near the powder ore silo decreases, failing to meet the judgment conditions of material return retention and conflict between material return and bottom discharge, and the record is recorded as quality not closed, a closure result for the corresponding abnormality in the silo is generated. When the second cleaning component is not executed, the second cleaning component action feedback is abnormal, or the second cleaning component action feedback is missing, the abnormality of the second cleaning component action feedback or the missing second cleaning component action feedback is written as the abnormality reason for the corresponding abnormality in the silo and written into the reverse material return record and the silo receiving record. The closure result for the corresponding abnormality in the silo is written into the reverse material return record, and the separation component stops adding new material and the first cleaning component pauses import as the restriction content of the reverse material return record in the next control cycle. The closure result for the corresponding abnormality in the silo is written into the silo receiving record, and the second cleaning component silo entry abnormality and the need for verification of the top material return port in the silo are the contents of the silo receiving record in the next control cycle. The closure result for the corresponding abnormality in the silo is written into the forward feeding record, and the action status of the bottom discharge gate in the silo is retained for judgment in the next control cycle.

[0097] When the weighing value of the second conveyor belt near the end of the ore bin decreases during the closure confirmation period, and the reverse material return execution record shows confirmation of material falling from the top of the bin, and the ore bin level increases after the closure confirmation period ends relative to before the start of the closure confirmation period, and the increase exceeds the allowable error specified in the valid verification or calibration certificate of the ore bin level gauge, it is recorded as a quality closure, and the weighing value of the bottom discharge of the bin during the closure confirmation period is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device, a closure result of the material return closure is generated. The closure result of the material return closure is written into the reverse material return record, so that the reverse material return batch will no longer be considered as an unclosed reverse material return batch and will enter the next control cycle. The closure result of the material return closure is written into the bin receiving record, so that the ore bin receiving content will resume participation in the judgment of the next control cycle. The closure result of the material return closure is written into the forward feeding record, so that the bottom discharge gate of the bin will participate in the judgment according to the feeding requirements of the grinding and flotation workshop in the next control cycle.

[0098] After the closure confirmation is completed, the closure result, closure confirmation period, silo top material discharge confirmation, second conveyor belt weighing change, fine ore silo material level change, silo bottom discharge weighing value, grinding and flotation workshop feeding change, quality closure or quality non-closure and the reason for non-closure are written into the reverse return material record. The content of silo bottom discharge gate letting material, silo bottom discharge gate resuming participation in the next control cycle judgment, silo bottom discharge gate maintaining the current action or silo bottom discharge gate giving priority to material is written into the forward feeding record. The content of fine ore silo receiving material, silo top return port needing to be checked, fine ore silo full silo protection, second cleaning component entering the silo abnormality or fine ore silo receiving material check is written into the silo body receiving record. The forward feeding record, reverse return material record and silo body receiving record are used as the reading content at the beginning of the next control cycle.

[0099] Depend on Figure 6 As can be seen, the horizontal axis represents the months of 2025, and the vertical axis represents the material return closure rate and the improvement rate of the closure rate. The curves respectively represent the material return closure rate under conventional control, the material return closure rate of this invention, and the improvement rate of the closure rate. Conventional methods mainly rely on the belt emptying or material dropping status to determine whether the reverse material return process is completed, which makes it difficult to distinguish between material return stagnation, material return and bottom discharge conflicts, and abnormalities in the corresponding silo entry. The method of this invention, on the other hand, performs batch-by-batch closure confirmation of the reverse material return execution record based on changes in the weighing of the second conveyor belt, confirmation of material dropping at the top of the silo, changes in the material level of the fine ore silo, weighing values ​​of the bottom discharge of the silo, and changes in the feed of the grinding and flotation workshop. Figure 6 In the present invention, months in which the material return closure rate is higher than the annual average material return closure rate indicate that, within the corresponding month, the reverse material return batch can complete the material return closure under the condition that there is no conflict between quality closure and bottom discharge. The curve fluctuation reflects that the present invention does not simply consider all top discharge batches as completed, but distinguishes the top discharge batches from the material return closure results when there is material return retention, conflict between material return and bottom discharge, or abnormal entry into the silo. The forward feeding record, reverse material return record, and silo receiving record are then written back. It can be seen that the present invention can improve the traceability and reliability of reverse material return batch closure confirmation and avoid abnormal batches being misjudged as normal closure.

[0100] In summary, this invention determines the reverse material return batch and expected arrival time based on the reverse material return record, and generates receiving results such as direct entry into the warehouse, material entry into the warehouse, waiting before arrival into the warehouse, or prohibition of new material return. This achieves unified receiving and judgment of reverse material return batches, material entry through the bottom discharge gate of the warehouse, and material feeding requirements of the grinding and floating workshop. By confirming the closure of the reverse material return execution record, it distinguishes between material return closure, material return retention, material return conflict with bottom discharge of the warehouse, or abnormal entry into the warehouse, thereby reducing timing conflicts and improving the reliability of reverse material return batch closure.

[0101] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the reverse conveying of materials across a grinding and flotation workshop using a feed belt in a fine ore bin, characterized in that, include: Collect data on the material level in the fine ore bin, the return port at the top of the bin, the discharge gate at the bottom of the bin, the material status on the first conveyor belt, the feeding requirements of the grinding and flotation workshop, the status of the separator, the second conveyor belt, the first cleaning component, and the second cleaning component, and generate positive feeding records, reverse return records, and bin receiving records. Based on the reverse return material records, the reverse return material batch and the expected arrival time in the warehouse are determined. Based on the warehouse receiving records, forward feeding records, the material status on the first conveyor belt and the feeding requirements of the grinding and floating workshop, the receiving results of direct entry into the warehouse, allowing material to enter the warehouse, waiting before arrival in the warehouse or prohibiting new return materials are generated. Based on the received results, the linkage control of the separator guide, the second conveyor belt runs, the first cleaning component is introduced, the second cleaning component enters the silo and the bottom discharge gate of the silo is activated. The batches that directly enter the silo are continuously entered into the silo, the batches that allow material to enter the silo are allowed to enter the silo after material is allowed, the batches that wait before entering the silo are waited to enter the silo after waiting, and the batches that are prohibited from adding new material return are stopped from adding new material return, thus forming a reverse material return execution record. Based on the changes in weighing of the second conveyor belt, confirmation of material falling from the top of the silo, changes in the material level of the fine ore silo, weighing value of material discharged from the bottom of the silo, and changes in feeding in the grinding and flotation workshop, the reverse material return execution record is closed and confirmed to obtain the closing results of material return closure, material return retention, material return conflict with material discharge from the bottom of the silo, or abnormal material entry into the silo, and these results are written into the forward feeding record, reverse material return record, and silo receiving record.

2. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 1, characterized in that, The process involves collecting data on the ore powder bin level, top return port, bottom discharge gate, material status on the first conveyor belt, feeding requirements of the grinding and flotation workshop, and the status of the separator, second conveyor belt, first cleaning assembly, and second cleaning assembly. This data forms positive feeding records, reverse return records, and bin receiving records. The specific steps are as follows: At the same acquisition time, the following data are collected: ore bin material level, bin top return port opening / closing and blockage status, bin bottom discharge gate opening and bin bottom discharge weighing value, first conveyor belt start / stop status, first conveyor belt speed, first conveyor belt weighing value, grinding and flotation workshop feeding requirements, separator material guiding status, first cleaning component introduction status, second conveyor belt start / stop status, second conveyor belt speed, second conveyor belt weighing value, second conveyor belt slippage signal, second conveyor belt deviation signal, second cleaning component bin entry status, and second cleaning component action feedback. The silo receiving record is generated based on the ore powder silo level, the opening and closing of the silo top return port and the blockage status. The positive feeding record is generated based on the silo bottom discharge gate opening, the silo bottom discharge weighing value, the material status on the first conveyor belt and the feeding requirements of the grinding and flotation workshop. The reverse return record is generated based on the separation component guiding status, the first cleaning component introduction status, the second conveyor belt status and the second cleaning component entering the silo status.

3. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 1 or 2, characterized in that, The specific steps for determining the reverse material batch and expected arrival time based on the reverse material return record are as follows: If there are unclosed reverse return batches in the reverse return record of the previous control cycle, the unclosed reverse return batches of the previous control cycle will be merged into the reverse return record of the current control cycle. The change in the weighing value of the second conveyor belt relative to the no-load allowable error specified in the valid verification certificate or calibration certificate of the second conveyor belt weighing device is used as the basis for the start and end of the batch. When the weighing value of the second conveyor belt changes from within the no-load allowable error to exceed the no-load allowable error, it is recorded as the front end of the reverse return batch entering the second conveyor belt. When the weighing value of the second conveyor belt changes from exceeding the no-load allowable error back to within the no-load allowable error, it is recorded as the rear end of the reverse return batch entering the second conveyor belt. When the unqualified gold ore powder introduced by the separator and the residual ore powder introduced by the first conveyor belt from the first cleaning component continuously enter the second conveyor belt before the weighing value of the second conveyor belt drops back to within the allowable error of no load, they are classified into the same reverse return batch. Based on the speed of the second conveyor belt and the installation distance between the second conveyor belt inlet and the top return port of the silo, the estimated arrival time of the front and rear ends of the reverse return batch at the top return port of the silo is determined.

4. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 3, characterized in that, The process of generating receiving results based on the silo receiving record, forward feeding record, the material status on the first conveyor belt, and the feeding requirements of the grinding and floating workshop includes: direct entry into the silo, allowing material into the silo, waiting before entering the silo, or prohibiting new material return. When the receiving record of the silo shows that the powder silo is full, the top return port of the silo is blocked, or the second cleaning component is abnormal when entering the silo, or the reverse return record shows that the second conveyor belt is slipping or the second conveyor belt is running off-center, a receiving result that prohibits the addition of new return material is generated, and the execution content of triggering reason, separation component stopping material feeding, first cleaning component pausing import and second conveyor belt stopping receiving new reverse return material batches is written. When the ore powder bin is ready to receive material, the second conveyor belt is conveying material, the bottom discharge gate of the bin is closed, and the expected arrival time has been formed, a direct entry receiving result is generated, and the following execution contents are written: reverse return batch number, expected arrival time, separation component continues to guide material, first cleaning component allows import, second conveyor belt runs continuously, and bottom discharge gate of the bin remains closed.

5. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 4, characterized in that, The process of generating receiving results based on the silo receiving record, forward feeding record, the material status on the first conveyor belt, and the feeding requirements of the grinding and floating workshop, including direct silo entry, allowing material into the silo, waiting before silo entry, or prohibiting new material return, also includes: Based on the belt speed of the first conveyor belt and the installation distance between the weighing position of the first conveyor belt and the feeding inlet of the grinding and flotation workshop, the expected time period for the first conveyor belt to carry material into the feeding inlet of the grinding and flotation workshop is determined. The weighing values ​​of the first conveyor belt with the expected arrival time no later than the end time of the expected arrival time are summarized according to the cumulative mass caliber to obtain the amount of material on the first conveyor belt. The amount of material on the first conveyor belt is then compared with the feeding demand of the grinding and flotation workshop determined according to the cumulative mass caliber in the same time period to determine whether the material on the first conveyor belt can meet the feeding demand of the grinding and flotation workshop. When the powder ore bin is ready to receive material, the second conveyor belt is conveying material, the bottom discharge gate of the bin is discharging material, the expected arrival time of the bin has been formed, and the first conveyor belt is able to meet the feeding needs of the grinding and flotation workshop, the receiving result of letting the material into the bin is generated. When no receiving result is generated prohibiting new material return, direct warehousing, or allowing material into the warehousing, and the warehousing receiving record does not show full warehousing protection for fines ore silos, a receiving result of waiting in front of the warehousing is generated. Write the receiving results into the reverse return record, write the content of the bottom discharge gate action involved in the receiving results into the forward feeding record, and write the content of the fine ore bin receiving involved in the receiving results into the bin receiving record.

6. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 1 or 5, characterized in that, The terms "continuous warehousing of directly received batches," "warehousing of batches after material release," "warehousing of batches awaiting arrival before warehousing," and "prohibition of adding new returned batches and stopping new imports" include: When the receiving result is direct entry into the silo, the separation component is controlled to keep the material guiding, the first cleaning component is allowed to enter, the second conveyor belt runs continuously, the bottom discharge gate of the silo remains closed, and the second cleaning component is controlled to perform the entry into the silo action. When the receiving result indicates that the material should be allowed to enter the silo, the control separator stops adding new material and the first cleaning component pauses the feeding. The control gate at the bottom of the silo reduces its opening until the weighing value at the bottom of the silo is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device. The control belt continues to transport the already formed reverse return batch and the control component performs the silo entry action.

7. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 6, characterized in that, The terms "continuous warehousing of directly received batches," "warehousing of batches after material release," "warehousing of batches before arrival at the warehouse," "warehousing of batches after waiting before arrival at the warehouse," and "prohibition of adding new returned batches and stopping new imports" also include: When the received result is waiting before the warehouse, the control separator stops adding new material, the first cleaning component pauses importing, and the reverse return batch that has formed the expected arrival time of the warehouse is transported to the waiting position in front of the return port on the top of the warehouse and then the conveyor stops waiting. When the material is being released from the bottom discharge gate of the silo, the bottom discharge gate continues to reduce its opening until the bottom discharge weighing value is within the no-load allowable error specified in the valid verification or calibration certificate of the bottom discharge weighing device. The second conveyor belt is then controlled to resume operation and the second cleaning component is controlled to perform the silo entry action. If a batch waiting to be stored in the warehouse is not completed within the current control cycle, the batch waiting to be stored in the warehouse will be retained as an unclosed reverse return batch.

8. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 7, characterized in that, The terms "continuous warehousing of directly received batches," "warehousing of batches after material release," "warehousing of batches before arrival at the warehouse," "warehousing of batches after waiting before arrival at the warehouse," and "prohibition of adding new returned batches and stopping new imports" also include: When the received result indicates that new return material is prohibited, the control separator stops feeding material, the first cleaning component pauses importing, and the second conveyor belt stops receiving new batches of reverse return material. When the second conveyor belt has already carried material, and the powder ore bin is ready to receive material, there is no blockage at the top return port of the bin, the second cleaning component does not record an abnormal entry into the bin, the second conveyor belt does not record slippage, and the second conveyor belt does not record deviation, control the second conveyor belt to discharge the material it has already carried into the powder ore bin, and control the second cleaning component to perform the entry into the bin action. When the material already loaded is not discharged into the fine ore bin, the material already loaded is retained as an unclosed reverse return batch.

9. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 1 or 8, characterized in that, The process of confirming the closed loop of the reverse material return execution record based on the changes in weighing of the second conveyor belt, confirmation of material discharge from the top of the silo, changes in the material level of the fine ore silo, weighing value of material discharged from the bottom of the silo, and changes in the feeding of the grinding and flotation workshop is as follows: The closing confirmation period is determined according to the reverse return material batch number, and within the closing confirmation period, the quality of the return material discharged from the second conveyor belt to the fine ore bin, the receiving quality caused by the change in the material level of the fine ore bin, the quality of the material discharged from the bottom of the bin, and the change in the feeding of the grinding and flotation workshop are determined. The mass of the returned material discharged into the fine ore bin by the second conveyor belt is compared with the sum of the mass of the material received due to the change in the material level in the fine ore bin and the mass of the material discharged from the bottom of the bin. The mass closure or non-closure is determined by summing the absolute value of the comparison difference with the allowable error stated in the valid verification or calibration certificate of the weighing device of the second conveyor belt, the allowable error stated in the valid verification or calibration certificate of the weighing device of the material discharged from the bottom of the bin, the allowable error stated in the valid verification or calibration certificate of the material level gauge of the fine ore bin, the mass error determined by the geometric dimensions of the fine ore bin and the bulk density of the gold ore fines.

10. The method for controlling the reverse material conveying across the grinding and flotation workshop by the feed belt of the powder ore bin as described in claim 9, characterized in that, The specific steps for obtaining the closing results of material return closure, material return retention, material return conflict with bottom discharge, or abnormal material entry into the silo, and writing them into the forward feeding record, reverse material return record, and silo receiving record, are as follows: When the weighing value of the second conveyor belt near the powder ore bin does not decrease, or when the weighing value of the second conveyor belt near the powder ore bin decreases but there is no confirmation of material dropping from the top of the bin in the reverse material return execution record, a closed result of material return retention is generated. When there is a confirmation of material dropping from the top of the silo in the reverse material return execution record, and the weighing value of material discharged from the bottom of the silo exceeds the no-load allowable error specified in the valid verification certificate or calibration certificate of the bottom discharge weighing device during the closed confirmation period, a closed result of the conflict between material return and bottom discharge is generated. When the reverse material return execution record contains confirmation of material dropping from the top of the silo, a decrease in the weighing value of the second conveyor belt near the powder ore silo, failure to meet the judgment conditions of material return retention and conflict between material return and material discharge from the bottom of the silo, and the record is recorded as quality not closed, a closed result corresponding to the silo entry abnormality is generated, and the second cleaning component not being executed, the second cleaning component action feedback being abnormal, or the second cleaning component action feedback being missing is written as the abnormality reason into the reverse material return record and the silo receiving record. When the weighing value of the second conveyor belt near the end of the ore bin decreases, the reverse material return execution record shows confirmation of material falling from the top of the bin, the material level in the ore bin increases, and it has been recorded as a quality closure, and the weighing value of the bottom discharge of the bin is within the no-load allowable error specified in the valid verification certificate or calibration certificate of the bottom discharge weighing device during the closure confirmation period, the closure result of the material return closure is generated. Write the closure result into the reverse return record, write the content involving the action of the bottom discharge gate into the forward feeding record, and write the content involving the receiving of powder ore into the silo receiving record.

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