Queuing discharging method for arbitrary cut-in or cut-out of multiple coal slime chamber type filter presses

Abstract

The invention relates to the technical field of queuing discharging of coal slime chamber type filter presses, in particular to a queuing discharging method for a plurality of coal slime chamber type filter presses to be cut in or cut out at will. According to the invention, the independent control systems of a plurality of filter presses are integrated into the centralized control system, so that the automatic scheduling of the unloading process is realized. A traditional manual inspection and manual operation mode is abandoned, it is ensured that only one filter press unloads at the same time through centralized signal collection and logical operation, and the problem that downstream conveying equipment is overloaded due to the fact that multiple equipment unloads at the same time is fundamentally solved; meanwhile, any filter press is supported to cut in or cut out the queuing process on line, when a certain device needs to be maintained or breaks down, scheduling can be dynamically quitted, operation of other devices is not affected, the flexibility and production continuity of the system are remarkably improved, and compared with a traditional mode, the manual intervention cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of queuing and unloading of coal slime van filter presses, in particular to a queuing and unloading method for cutting in or out of multiple coal slime van filter presses. BACKGROUND

[0002] Clean and efficient utilization of coal is an important strategic direction for green and sustainable development of energy in China. Wet coal preparation, as a source technology in this field, produces a large amount of coal slime water slurry in the production process, which is mainly separated by coal slime van filter presses.

[0003] The existing filter press unloading link has significant technical bottlenecks: the traditional process completely relies on manual on-site operation, which requires checking the working state of each device and judging the unloading conditions. When multiple devices are running in parallel, the operation process is complicated, the labor intensity is large, and the unloading efficiency is low due to human judgment errors. The existing coal preparation plant centralized control system can only display the device state and lacks remote control capability for the unloading process. When multiple filter presses are unloaded simultaneously, the downstream belt conveyor, scraper conveyor and other conveying equipment are prone to overload or blockage, and the existing technology cannot dynamically schedule based on real-time device state, resulting in serious damage to production continuity and directly affecting the overall production efficiency of the filter press system.

[0004] In view of the poor coordination of multiple filter presses in collaborative unloading scheduling and the overloading of downstream equipment, the present application proposes a queuing and unloading method that supports arbitrary device cutting in or out to achieve intelligent scheduling and efficient production. SUMMARY

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present application provides a queuing and unloading method for multiple coal slime van filter presses with arbitrary cutting in or out. The present application integrates multiple filter press independent control systems into a centralized control system, realizes automatic scheduling, prevents overloading, supports device cutting in and out, and reduces labor costs.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A queuing and unloading method for multiple coal slime van filter presses with arbitrary cutting in or out, comprising the following steps:

[0008] Integrating the independent control systems of multiple coal slime van filter presses into the centralized control system of the coal preparation plant through communication;

[0009] The centralized control system collects the pull plate trolley parking limit signal and the end of feeding waiting for unloading signal of each filter press in real time;

[0010] The centralized control system sets the queuing switching signal and the variable of the filter press being queued and unloaded.

[0011] Based on the pull plate trolley parking limit signal, the end of feeding waiting for discharging signal, the queuing switching signal and the queuing discharging variable, the queuing discharging scheduling of the filter press is realized through logical operation, so that only one filter press discharges at the same time, and any filter press can cut in or cut out the queuing discharging process is supported.

[0012] As a further scheme of the application, the communication mode for integrating the independent control systems of the multiple coal slime van filter presses into the centralized control system of the coal preparation plant is the RS-485 field bus communication mode or the TCP / IP Ethernet communication mode.

[0013] As a further scheme of the application, the end of discharging state of the filter press is determined by the following formula:

[0014]

[0015] In the formula, C i (t) represents the end of discharging state of the filter press at t time; A i (t) represents the queuing switching signal of the filter press at t time, B i (t) represents the parking limit signal of the pull plate trolley of the filter press at t time, C i represents the end of discharging signal of the filter press, i=1, 2, 3; τ represents the time variable, dτ represents the time differential, t0 represents the starting point of time when A i (τ)∧B i (τ) becomes true; t represents the ending point of time when A i (τ)∧B i (τ) becomes true; the integral represents the cumulative time when A i (τ)∧B i (τ) is continuously true, and C i is triggered when the cumulative time ≥2; if A i (τ) or B i (τ) is disconnected, i.e. becomes false, then C i (t) is reset to 0.

[0016] As a further scheme of the application, the setting and resetting of the end of discharging holding signal of the filter press are realized through RS latch and pulse operation, specifically:

[0017] When the end of discharging signal C i (t) of the filter press is true, the pulse signal is outputted by triggering the pulse operator, the end of discharging holding signal E i (t) at t time is set to 1 through the RS latch, so that the filter press exits the current queuing discharging competition;

[0018] When the next end of feeding waiting for discharging signal Di (t) is true, the end of discharge holding signal E is latched by RS i (t) is set to 0, so that the filter press re-joins the queue for discharge competition.

[0019] As a further aspect of the application, the scheduling logic for the filter press queue discharge includes:

[0020] When the filter press end of feed waiting for discharge signal D i (t) is true and the end of discharge holding signal E i (t) is false, the filter press queue discharge request is triggered;

[0021] The priority of each filter press in the queue is determined by logical operation, ensuring that the filter press that first meets the discharge condition is given priority for discharge.

[0022] After the current discharge filter press has finished discharging, the next filter press that meets the condition is given priority for discharge, ensuring seamless connection of the discharge process.

[0023] As a further aspect of the application, the implementation of the filter press cutting in or cutting out of the queue discharge process is as follows:

[0024] Cutting out: the queue switching signal A of the target filter press is set to i (t) is set to low, so that it exits the queue discharge logical operation;

[0025] Cutting in: the queue switching signal A of the target filter press is set to i (t) is set to high, so that it re-joins the queue discharge competition.

[0026] As a further aspect of the application, the centralized control system performs digital filtering on the collected signals to prevent false actions and misoperations.

[0027] As a further aspect of the application, multiple coal slime compartment filter presses are provided, each with an independent control system for executing the processes of compression, feeding, pressing, back flushing, unpressing, pressure relief, and discharge.

[0028] The centralized control system of the coal preparation plant communicates with the independent control systems of each filter press through RS-485 field bus or TCP / IP Ethernet, and is used for:

[0029] Collecting the plate pulling trolley parking limit signal and the end of feed waiting for discharge signal of each filter press;

[0030] Setting the queue switching signal and the queue discharge variable of each filter press;

[0031] Based on the signal, the filter press queue unloading scheduling is realized through logical operation, ensuring that only one filter press is unloading at the same time, and supporting any filter press to enter or exit the queue unloading process.

[0032] As a further solution of the present invention, the centralized control system of the coal preparation plant has a built-in logic operation module for performing the following operations:

[0033] Based on the parking limit signal B of the pull trolley i (t) and queue switching signal A i (t), determine the unloading end signal C through logical AND operation and time filtering i (y);

[0034] Based on the unloading end signal C i (y) and the end of feeding and waiting for the unloading signal D i (y), generate the unloading end holding signal E through RS latch and pulse operation i (t);

[0035] Based on the queue switching signal A i (t), unloading end holding signal E i (t) and the queue status of other filter presses, and the queue unloading variable G of each filter press is determined by logical operation. i (t), to achieve dynamic allocation of queue unloading priority.

[0036] As a further solution of the present invention: the number of the multiple coal slime chamber filter presses is more than three, and the plate pulling trolley of each filter press is equipped with a parking limit sensor for generating a parking limit signal for the plate pulling trolley.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. This invention achieves automated scheduling of the unloading process by integrating the independent control systems of multiple filter presses into a centralized control system. This eliminates traditional manual inspections and manual operation modes. By centrally collecting signals and performing logical operations, it ensures that only one filter press is unloading at a time, fundamentally resolving the problem of overloading downstream conveying equipment caused by multiple devices unloading simultaneously. Furthermore, it supports any filter press to be switched in or out of the queue process online. When a device requires maintenance or malfunctions, it can be dynamically de-scheduled without affecting the operation of other devices. This significantly improves system flexibility and production continuity, and significantly reduces manual intervention costs compared to traditional methods.

[0039] 2、Communication mode advantages: RS-485 field bus or TCP / IP Ethernet communication mode, with strong engineering adaptability: RS-485 communication mode is low in cost and simple in wiring, suitable for small and medium-sized coal preparation plants with high real-time requirements, which can directly use the existing industrial bus network; TCP / IP Ethernet mode has high-speed data transmission capability and remote control advantage, suitable for centralized monitoring system of large coal preparation plant, supporting cross-network scheduling and remote operation and maintenance. Both communication modes can realize real-time data interaction between multiple filter presses and centralized control system, providing communication basis for accurate scheduling of queuing and unloading.

[0040] 3、Unloading end determination formula advantages: The determination formula through logical AND operation and time filtering (duration ≥ 2 seconds) effectively avoids misjudgment caused by industrial field signal jitter. Specifically: the pull plate trolley parking limit signal ensures that the physical position of the equipment returns to the initial state, and the queuing switching signal confirms that the equipment is in automatic queuing mode, and the logical AND operation of the two excludes false triggering in non-queuing state; the condition of duration ≥ 2 seconds filters out transient interference (such as sensor false touch caused by mechanical vibration), greatly improving the accuracy of the unloading end signal, and providing a reliable state basis for the subsequent queuing logic.

[0041] 4、RS latch and pulse operation advantages: This mechanism realizes dynamic management of unloading state through RS latch and pulse operator (TP): when the filter press unloading is completed, the unloading end signal triggers the TP to output a 2-second pulse, and the RS latch sets the unloading end hold signal to 1, so that the equipment exits the current queuing competition and avoids repeated participation in scheduling; when the next feeding is completed, the feeding end waiting for unloading signal sets the unloading end hold signal to 0 through the RS latch, and the equipment rejoins the queue. This closed-loop control of "unloading end exit - feeding end join" ensures that each filter press only participates in queuing at a reasonable stage, reduces invalid waiting time, and greatly improves equipment utilization compared to traditional fixed sequence unloading.

[0042] 5、Queuing and unloading scheduling logic advantages: The scheduling logic follows the principle of "efficiency first, seamless connection": when multiple filter presses meet the unloading conditions at the same time, the system schedules the equipment that completes the process link first through logical operation, avoiding the waste of idling caused by "queuing and waiting"; after the current equipment unloads, the next filter press that meets the conditions starts unloading immediately, and the unloading process switching time is controlled within 5 seconds, realizing "zero waiting" connection. This mechanism not only improves the overall processing efficiency of the system, but also dynamically controls the unloading rhythm, so that the load fluctuation amplitude of the downstream conveying equipment is controlled within ±10% of the rated value, completely solving the problems of overload and blockage.

[0043] 6、The advantage of cut-in / cut-out control is achieved by queuing the high and low level of switching signals to realize dynamic scheduling of the filter press: when cutting out, the device directly exits the queuing logic operation and does not participate in the unloading permission competition, which is suitable for device fault maintenance or temporary shutdown without interrupting the entire filter press system; when cutting in, the device automatically joins the queue according to the current process state without manual parameter reset. This function allows the system to maintain more than 80% productivity during partial device maintenance, reducing production loss by more than 1 million yuan per year compared to the traditional whole-line shutdown maintenance mode.

[0044] 7、The advantage of digital filtering processing is that the central control system performs digital filtering processing on the collected signals to eliminate the instantaneous interference of the draw plate trolley limit signal and the end of feeding signal, preventing unloading process disorder caused by false signals. Actual measurement data shows that the system false action rate is reduced from 15 times / month before modification to less than 0.5 times / month, significantly improving the operation stability of the filter press system and reducing equipment damage and production interruption caused by false operation.

[0045] 8、The advantage of the system architecture is that the system adopts a hierarchical architecture of "independent control + centralized scheduling": each filter press retains an independent control system to perform basic process actions, and the centralized control system realizes global scheduling through a standardized communication interface. Its advantages are: on the one hand, it is compatible with existing filter press equipment, and does not need to replace the underlying controller, reducing hardware modification cost by more than 60%; on the other hand, it realizes multi-device collaborative optimization through centralized scheduling, which can monitor all device states in real time and dynamically adjust the unloading sequence compared to the traditional decentralized control mode, especially suitable for coal preparation plants with large fluctuation in processing capacity.

[0046] 9、The advantage of the logic operation module is that the logic operation module integrated in the centralized control system realizes intelligent scheduling through multiple algorithms: the unloading end determination algorithm ensures state accuracy, the RS latch logic manages the queuing state, and the priority allocation algorithm realizes "first come, first unloading". This module can flexibly configure parameters (such as filtering time and pulse width) according to actual production needs to adapt to different coal slime properties and equipment conditions; at the same time, it supports real-time data visualization, and operators can monitor the queuing state and unloading priority of each filter press through the human-machine interface, providing intuitive basis for production decision-making.

[0047] 10. Advantages of Equipment and Sensor Configuration: The system supports the coordinated operation of three or more filter presses. Each unit's pull-plate trolley is equipped with a high-precision stop limit sensor. The sensor provides real-time feedback on the trolley's initial position, providing a physical basis for determining the end of unloading, with a positioning error of ≤2mm. A multi-device configuration supports a "multi-line parallel" unloading mode, maximizing overall processing capacity through queue scheduling while ensuring single-unit unloading. Taking three filter presses as an example, this configuration can increase daily coal slime processing capacity by 200-300 tons compared to a single unit operating independently, significantly improving the coal preparation plant's production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is the queuing unloading flow chart of the present invention.

[0049] Figure 2 This is a layout diagram of the communication method based on RS-485 field bus.

[0050] Figure 3 This is a layout diagram of Ethernet communication using TCP / IP.

[0051] Figure 4 This is a schematic diagram of the discharge completion signal for filter press No. 1.

[0052] Figure 5 This is a schematic diagram of the discharge completion signal for filter press No. 2.

[0053] Figure 6 This is a schematic diagram of the discharge completion signal for filter press No. 3.

[0054] Figure 7 This is a schematic diagram of the holding signal for the end of unloading of filter press No. 1.

[0055] Figure 8 This is a schematic diagram of the holding signal for the end of unloading of filter press No. 2.

[0056] Figure 9 This is a schematic diagram of the holding signal for the end of unloading of filter press No. 3.

[0057] Figure 10 This is a schematic diagram of the No. 1 filter press queuing for unloading.

[0058] Figure 11 This is a schematic diagram of the No. 2 filter press queuing for unloading.

[0059] Figure 12 This is a schematic diagram of the No. 3 filter press queuing for unloading. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0061] In the filter pressing production link, multiple coal slurry van filter presses usually work simultaneously, and the working process of each coal slurry van filter press is generally divided into the links of pressing, feeding, pressing, back blowing, withdrawing, pressure relief and discharging. When the filter pressing just starts production, all the coal slurry van filter presses work simultaneously, and the head plate of each filter press starts to be pressed at the same time. After the pressing is completed, the feeding pump starts to feed, and the coal slurry is pumped into the filter press for solid-liquid separation. The coal slurry particles remain in the chamber and gradually increase to form a filter cake. The filtrate water flows out of the filter press through the filter cloth and enters the filtrate water pipeline. After the feeding is completed, the filter press starts to press to further squeeze the water in the coal slurry filter cake. After the pressing, the residual coal slurry in the center hole of the filter plate and the pipeline is back blown to the coal slurry tank. After the back blowing is completed, the filter press starts to withdraw and relieve the pressure of the hydraulic station for pressure relief. After the pressure relief is completed, the filter press pulls open the head plate through the hydraulic push rod, starts the plate pulling trolley to pull the plate and discharges the filter cake. The discharged coal slurry filter cake falls into the downstream conveying equipment and is transported to the coal slurry field by the conveying equipment.

[0062] When the filter pressing system is not working, multiple filter presses are in standby state. When the filter pressing system just starts production, all the filter presses start to work almost simultaneously, and the pressing, feeding, pressing, back blowing, withdrawing, pressure relief and discharging are simultaneously performed. When discharging, the coal slurry filter cakes of multiple coal slurry van filter presses fall onto the same conveying equipment simultaneously, which causes the overload of the downstream equipment. If the discharging is not simultaneous, i.e. the multiple coal slurry van filter presses are discharged one by one, when one coal slurry van filter press is discharging, the other coal slurry van filter presses are in the state of waiting for discharging. This not only increases the labor intensity, but also greatly reduces the production efficiency and processing capacity of the filter pressing system.

[0063] In order to better solve the above problems, the present application performs a queuing discharging scheduling algorithm for each coal slurry van filter press, so that the filter press which first reaches the discharging condition is discharged first, and the filter press which reaches the discharging condition later is discharged later. Only one filter press is discharging at the same time, and the other filter presses are in the state of waiting for discharging. Once the current filter press completes the discharging, the filter press which reaches the condition first starts to discharge, so as to realize seamless connection of discharging.

[0064] Since the coal slime van type filter press has a separate control system, in order to realize the queuing unloading of any cut-in or cut-out of multiple coal slime van type filter presses, the control systems of the multiple filter presses need to be integrated into the centralized control system through communication, which is illustrated below by taking the queuing unloading of three coal slime van type filter presses as an example Figure 2 and Figure 3 as shown, Figure 2 is to integrate the control systems of the three filter presses 1#, 2# and 3# into the centralized control system of the coal preparation plant by using the RS-485 field bus communication mode. Figure 3 is to integrate the control systems of the three filter presses 1#, 2# and 3# into the centralized control system of the coal preparation plant by using the TCP / IP Ethernet communication mode. After integration, all filter presses can be scheduled and coordinately controlled in the centralized control system of the coal preparation plant.

[0065] The centralized control system of the coal preparation plant needs to collect the following signals in real time:

[0066] (1) The parking limit signals of the pull plate trolley of each filter press, i.e. the initial position signals of the pull plate trolley, which are respectively recorded as the parking limit of the pull plate trolley of the No. 1 filter press, the parking limit of the pull plate trolley of the No. 2 filter press and the parking limit of the pull plate trolley of the No. 3 filter press.

[0067] (2) After the filter press goes through the processes of feeding, pressing, back flushing and unpressing, the head plate of the filter press can be pulled open and unloading can be performed. At this time, the filter press generates a signal of feeding end and waiting for unloading, which is respectively recorded as the feeding end and waiting for unloading of the No. 1 filter press, the feeding end and waiting for unloading of the No. 2 filter press and the feeding end and waiting for unloading of the No. 3 filter press.

[0068] At the same time, the centralized control system of the coal preparation plant needs to set the following signals:

[0069] (1) The state conversion of the cut-in and cut-out of any filter press for queuing unloading, which is respectively recorded as the queuing switching of the No. 1 filter press, the queuing switching of the No. 2 filter press and the queuing switching of the No. 3 filter press.

[0070] (2) The variables for controlling whether the filter press in the queue is unloading, which are respectively recorded as the No. 1 filter press is unloading in the queue, the No. 2 filter press is unloading in the queue and the No. 3 filter press is unloading in the queue.

[0071] In the production process of the coal slime van type filter press, generally, the pull plate trolley returns to the initial position to indicate the unloading end state. In order to better and more reliably express the unloading end state of the coal slime van type filter press, the parking limit signal of the pull plate trolley returning to the initial position is transmitted to the centralized control system of the coal preparation plant, and the parking limit signal is processed. The specific implementation program and algorithm formula are shown below:

[0072]

[0073] wherein the variable A i represents the filter press queue switching, B i represents the filter press pull plate trolley parking limit, C i represents the filter press unloading end, i = 1, 2, 3; that is, A1, A2, A3 respectively represent the 1st filter press queue switching, the 2nd filter press queue switching, and the 3rd filter press queue switching; B1, B2, B3 respectively represent the 1st filter press pull plate trolley parking limit, the 2nd filter press pull plate trolley parking limit, and the 3rd filter press pull plate trolley parking limit; C1, C2, C3 respectively represent the 1st filter press unloading end, the 2nd filter press unloading end, and the 3rd filter press unloading end; t0 is the time point when A i and B i become true; the integral represents the cumulative time when A i and B i are continuously true, and C i is triggered when the cumulative time is greater than or equal to 2; if A i or B i is disconnected (becomes false) during the period, C i is reset to 0.

[0074] The 1st filter press pull plate trolley parking limit, the 2nd filter press pull plate trolley parking limit, and the 3rd filter press pull plate trolley parking limit signals collected by the centralized control system of the coal preparation plant are respectively logically ANDed with the corresponding 1st filter press queue switching, 2nd filter press queue switching, and 3rd filter press queue switching signals to ensure that the filter presses are all in the automatic queue unloading mode. When the 1st filter press pull plate trolley parking limit, the 2nd filter press pull plate trolley parking limit, and the 3rd filter press pull plate trolley parking limit signals are all high level, that is, the pull plate trolley returns to the initial position, the high level result of the logical AND operation is digitally filtered to prevent misoperation and misoperation, and the filtered result is respectively used as the 1st filter press unloading end, 2nd filter press unloading end, and 3rd filter press unloading end signal. As can be seen from formula (1), when the filter press queue switching A i and the filter press pull plate trolley parking limit B i are logically ANDed, and the structure after the logical AND operation is integrated; only when the variables A i and B i are continuously true, the filter press unloading end C i can be true; when the variables A i or B i are false at a certain moment, the filter press unloading end C i is false.

[0075] After the filter press unloading is finished, the current filter press needs to exit the queue unloading and does not need to compete with the filter press which has not been unloaded. The current filter press can trigger the queue unloading again only when it waits for unloading after the next feeding is finished, competes with the current filter press which has not been unloaded, and waits for unloading. The specific implementation program and logic control algorithm are as follows:

[0076]

[0077]

[0078] D i represents that the filter press feeding is finished and waits for unloading, E i represents that the filter press unloading is finished and keeps the signal, i = 1, 2, 3; that is, D1, D2, and D3 respectively represent that the No. 1 filter press feeding is finished and waits for unloading, the No. 2 filter press feeding is finished and waits for unloading, and the No. 3 filter press feeding is finished and waits for unloading; E1, E2, and E3 respectively represent that the No. 1 filter press unloading is finished and keeps the signal, the No. 2 filter press unloading is finished and keeps the signal, and the No. 3 filter press unloading is finished and keeps the signal; when D i is effective (in the T window time, which is 2 s here), E i is immediately set to 0; when D i is effective and its rising edge is later than the latest pulse of D i , E i is set to 1; when there is no effective pulse, E i keeps the original state.

[0079] When the No. 1 filter press unloading is finished, the No. 2 filter press unloading is finished, and the No. 3 filter press unloading is finished variables become high level, it indicates that the current filter press has finished unloading and can exit the current queue unloading competition. The No. 1 filter press unloading is finished and keeps the signal, the No. 2 filter press unloading is finished and keeps the signal, and the No. 3 filter press unloading is finished and keeps the signal are set to 1 through the RS latch operation, and the exit of the current queue unloading competition is completed. When the filter press is ready for unloading after the next feeding is finished, the filter press is added to the current filter press queue unloading competition again. When the No. 1 filter press feeding is finished and waits for unloading, the No. 2 filter press feeding is finished and waits for unloading, and the No. 3 filter press feeding is finished and waits for unloading variables are high level, it indicates that the current filter press has finished feeding and waits for unloading. The No. 1 filter press unloading is finished and keeps the signal, the No. 2 filter press unloading is finished and keeps the signal, and the No. 3 filter press unloading is finished and keeps the signal are set to 0 through the RS latch operation, and the addition of the current queue unloading competition is completed. As can be seen from formula (2) and formula (3), when the filter press unloading is finished C i and the filter press feeding is finished and waits for unloading D iFrom low to high, and immediately output a high pulse signal with a pulse width of T (here T is 2s), and perform a reset-priority RS logic operation on the signals of and , and the result is E i (t); that is, when is high, regardless of whether is high or low, the result of E i (t) is 0; when is low, is high, the result of E i (t) is 1; thereby calculating the result of the filter press unloading end holding signal E i (t).

[0080] By setting a filter press queuing unloading variable for each filter press, combining the above filter press related variables, and performing a logic operation on the filter press queuing unloading variable through a related logic algorithm, the result of the operation determines whether the current filter press is unloading, and the specific implementation program and logic control algorithm are as follows:

[0081]

[0082] F i represents that the filter press is unloading, G i represents that the filter press is queuing unloading, i = 1, 2, 3; that is, F1, F2, F3 respectively represent that the No. 1 filter press is unloading, the No. 2 filter press is unloading, and the No. 3 filter press is unloading; G1, G2, G3 respectively represent that the No. 1 filter press is queuing unloading, the No. 2 filter press is queuing unloading, and the No. 3 filter press is queuing unloading.

[0083] respectively become true at the time point; the integral represents

[0084] respectively continue to be true for the cumulative time, and when the cumulative time ≥ 2, G1, G2, G3 are triggered respectively, and if any one of the variables is disconnected (becomes false) during the period, G1, G2, G3 are reset to 0.

[0085] The No. 1 filter press is queuing unloading, the No. 2 filter press is queuing unloading, and the No. 3 filter press is queuing unloading are obtained through a series of logic operations. Taking the calculation of the No. 1 filter press queuing unloading as an example:

[0086] In the calculation process of the No. 1 filter press being in the queue for unloading, first, the No. 1 filter press queue switching variable is set to 1, so that the No. 1 filter press joins the queue for unloading competition. At the same time, it needs to be considered whether the No. 2 filter press and the No. 3 filter press participate in the queue for unloading. If they participate, the No. 2 filter press queue switching variable and the No. 3 filter press queue switching variable are high level; if they do not participate, the No. 2 filter press queue switching variable and the No. 3 filter press queue switching variable are low level, then the No. 2 filter press is in the queue for unloading variable and the No. 3 filter press is in the queue for unloading variable directly become low level; in the calculation process of the No. 1 filter press being in the queue for unloading, the No. 2 filter press is in the queue for unloading variable and the No. 3 filter press is in the queue for unloading variable after the NOT operation are input to the result of the logical AND operation becomes high level, that is, the formula (5) in and G2(t) and G3(t) are both 0 after the NOT operation The result is 1. At this time, the state of the No. 2 filter press and the No. 3 filter press which do not participate in the queue for unloading does not affect the logical operation result of the No. 1 filter press being in the queue for unloading.

[0087] If the current feeding of the No. 1 filter press has ended and is waiting for unloading, is 1, as shown in Figure 7 and formulas (2), (3), (4), at this time, the No. 1 filter press unloading end holding signal variable E1 after operation is 0, low level, after the NOT operation in IN6 in front of Figure 10 and the NOT operation in front of formula (5), becomes high level, so that the No. 1 filter press is in the queue for unloading becomes high level, so that the result of the current No. 1 filter press is in the queue for unloading variable G1 calculation is 1, high level, that is, the current No. 1 filter press is in the queue for unloading has priority, starts unloading.

[0088] When the No. 1 filter press unloading is completed, the No. 1 filter press plate car returns to the initial position, and the No. 1 filter press plate car stop limit variable is set to 1 again, as shown in Figure 4 and formula (5), after logical AND operation with the No. 1 filter press queue switching variable and after digital filtering, the No. 1 filter press unloading end variable becomes high level; after the No. 1 filter press unloading end variable becomes high level, as shown in Figure 7 and formulas (2), (3), (4), the No. 1 filter press unloading end variable becomes high level and after pulse operation, the Q output end of the TP pulse operator continuously outputs a high level pulse of 2 seconds, and then inputs to the S end of the RS latch, so that the No. 1 filter press unloading end holding signal is set to 1 state, and then after the logical operation of Figure 10 and formula (5), the No. 1 filter press is in the queue for unloading variable becomes low level, and the queue for unloading of the No. 1 filter press is completed.

[0089] When filter press No. 1 completes queuing and unloading, the variable of filter press No. 1 being queuing and unloading becomes low. Similarly, the variable of filter press No. 1 being queuing and unloading, which is at a low level, is input into the logic and operation after the inversion operation, and participates in the logic operation of filter press No. 2 being queuing and unloading and filter press No. 3 being queuing and unloading. When filter press No. 2 finishes unloading, the holding signal is reset to a low level first. After the logic operation, the variable of filter press No. 2 being queuing and unloading becomes high level first, and it has priority in obtaining the queuing and unloading authority. If the holding signal of filter press No. 3 finishes unloading and becomes low level first, after the logic operation, the variable of filter press No. 3 being queuing and unloading becomes high level first, and it has priority in obtaining the queuing and unloading authority.

[0090] The efficiency-first scheduling principle ensures that filter presses that meet discharge conditions first are discharged first, improving system efficiency. Dynamic monitoring of discharge conditions prevents overloading of downstream conveying equipment. Furthermore, intelligent queuing ensures seamless integration between discharge and pressing, reducing equipment idling time. This also reduces the need for manual inspections, avoids equipment wear and tear caused by frequent operation, and extends equipment life.

[0091] When any one or more of the multiple coal slime chamber filter presses are in operation, by setting the queue switch of the corresponding filter press to a low level, the logical operation of the filter press exiting the queue for unloading can be realized. Taking three filter presses as an example, one of the filter presses exits the queue for unloading. Assuming that filter press No. 2 needs maintenance due to a fault and exits the queue for unloading among the three filter presses, the queue switch variable of filter press No. 2 is low. Figure 11 As shown, the variable of the queuing switch of filter press No. 2 is at a low level. After the input of IN5 of the logic AND operator, since it is at a low level, the result after the logic AND operation is a low level, so the variable of filter press No. 2 queuing for unloading is at a low level.

[0092] like Figure 10 and Figure 12 In the process, since the No. 2 filter press queue switching variable and the No. 2 filter press queue unloading variable are low, then Figure 10 The logical AND operator IN1 and IN3 of the 6 inputs are always high after the inversion operation, which does not affect the logical operation result of the variable of the No. 1 filter press being queued for unloading; Figure 12 The logical AND operator IN2 and IN4 of the middle 6 inputs are always at high level after the inversion operation, which does not affect the logical operation result of the variable that the No. 3 filter press is queuing for unloading; thereby realizing the No. 2 coal slime chamber filter press being cut out of the queue for unloading.

[0093] If the No. 2 filter press is repaired and the fault is eliminated, and it rejoins the current three filter presses that are queuing for unloading, then the No. 2 filter press queue switching variable will be high. Figure 11As shown, the queue switching variable of the No. 2 filter press is high level, and is the IN5 input of the variable logic AND operator of the No. 2 filter press being in queue unloading.

[0094] As shown in Figure 10 and Figure 12 Since the queue switching variable of the No. 2 filter press is high level, the No. 2 filter press being in queue unloading variable directly participates in the logical operation of the No. 2 filter press being in queue unloading variable and the No. 3 filter press being in queue unloading variable, and directly affects the logical operation result of the No. 2 filter press being in queue unloading variable and the No. 3 filter press being in queue unloading variable, thereby realizing the cutting in of the queue unloading of the No. 2 coal slime van filter press.

[0095] In summary, the queue switching variable of a certain coal slime van filter press is set or reset, thereby realizing the cutting in or cutting out of the queue unloading of the coal slime van filter press.

[0096] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art, according to the technical solution and the inventive concept of the present application, within the technical range disclosed by the present application, makes equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A queuing and unloading method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses, characterized in that: The following steps are involved: Integrate the independent control systems of multiple coal slime chamber filter presses into the centralized control system of the coal preparation plant through communication; The centralized control system collects the stop limit signal of the plate pulling trolley and the signal of the end of feeding and waiting for unloading of each filter press in real time; The centralized control system sets the queue switching signal and queue unloading variable of each filter press; Based on the pull-plate trolley parking limit signal, the feeding end waiting for unloading signal, the queue switching signal and the queue unloading variable, the queue unloading scheduling of the filter press is realized through logical operation to ensure that only one filter press is unloading at the same time, and support any filter press to enter or exit the queue unloading process.

2. A queuing and unloading method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 1, characterized in that: The communication mode for integrating the independent control systems of multiple coal slime chamber filter presses into the centralized control system of the coal preparation plant is RS-485 field bus communication mode or TCP / IP Ethernet communication mode.

3. The method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 2, characterized in that: The following formula is used to determine the end state of filter press discharge: Where C i (t) represents the unloading completion state of the filter press at time t; A i (t) represents the queue switching signal of the filter press at time t, B i (t) represents the stop limit signal of the filter press plate trolley at time t, C i Indicates the filter press discharge end signal, i = 1, 2, 3; τ represents the time variable, dτ represents the time differential, t0 represents A i (τ)∧B i (τ) is the starting time when it becomes true; t represents A i (τ)∧B i The end time when (τ) becomes true; the integral represents A i (τ)∧B i (τ) The cumulative time that the signal is true. When the cumulative time is ≥ 2, C is triggered. i , if period A i (τ) or B i (τ) is disconnected, that is, it becomes false, then C i (t) is reset to 0.

4. A queuing and unloading method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 3, characterized in that: The setting and resetting of the filter press discharge completion holding signal are realized through RS latch and pulse operation, specifically: When the filter press discharge ends signal C i When (t) is true, the trigger pulse operator outputs a pulse signal, and the unloading end holding signal E at time t is held by the RS latch. i (t) is set to 1, so that the filter press withdraws from the current queue unloading competition; When the filter press is finished feeding the next time, wait for the discharge signal D i When (t) is true, the unloading end holding signal E is held by the RS latch. i (t) is set to 0, so that the filter press rejoins the queue for unloading competition.

5. The method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 4, characterized in that: The scheduling logic of the filter press queuing unloading includes: When the filter press finishes feeding and waits for the discharge signal D i (t) is true and the unloading is completed and the signal E is maintained i When (t) is false, the filter press is triggered to queue up for unloading; Determine the priority of each filter press in the queue through logical operations to ensure that the filter press that meets the unloading conditions first is unloaded first; When the current unloading filter press finishes unloading, the next filter press that meets the conditions will be scheduled to start unloading first, so as to achieve seamless connection of the unloading process.

6. A queuing and unloading method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to any one of claims 1 to 5, characterized in that: The filter press can be cut into or out of the queue unloading process in the following ways: Cut out: Switch the queue signal A of the target filter press i (t) is set to low level to exit the queue unloading logic operation; Cut in: Switch the queue signal A of the target filter press i (t) is set to a high level to allow it to re-participate in the queue unloading competition.

7. A queuing and unloading method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 6, characterized in that: The centralized control system performs digital filtering on the collected signals to prevent malfunctions and misoperations.

8. The method for arbitrarily cutting in or out a plurality of coal slime chamber filter presses according to claim 7, characterized in that: Multiple coal slime chamber filter presses, each equipped with an independent control system to execute the process steps of compaction, feeding, pressing, backflushing, withdrawal, pressure relief and unloading; The centralized control system of the coal preparation plant communicates with the independent control systems of each filter press via RS-485 fieldbus or TCP / IP Ethernet, and is used to: Collect the stop limit signal of the plate pulling trolley and the signal of the end of feeding and waiting for unloading of each filter press; Set the queue switching signal and queue unloading variable of each filter press; Based on the signal, the filter press queue unloading scheduling is realized through logical operation, ensuring that only one filter press is unloading at the same time, and supporting any filter press to enter or exit the queue unloading process.

9. A queuing and unloading method for randomly cutting in or out a plurality of coal slime chamber filter presses according to claim 8, characterized in that: The centralized control system of the coal preparation plant has a built-in logic operation module for performing the following operations: Based on the parking limit signal B of the pull-plate trolley i (t) and queue switching signal A i (t), determine the unloading end signal C through logical AND operation and time filtering i (t); Based on the unloading end signal C i (t) and the end of feeding and waiting for the unloading signal D i (t), the unloading end holding signal E is generated through RS latch and pulse operation i (t); Based on the queue switching signal A i (t), unloading end holding signal E i (t) and the queue status of other filter presses, and the queue unloading variable G of each filter press is determined by logical operation. i (t), to achieve dynamic allocation of queue unloading priority.

10. A queuing and unloading method for randomly cutting in or out a plurality of coal slime chamber filter presses according to claim 9, characterized in that: The number of the multiple coal slime chamber filter presses is more than three, and the plate pulling trolley of each filter press is equipped with a parking limit sensor for generating a parking limit signal for the plate pulling trolley.

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