Automatic control system and control method for belt process of filter press

Abstract

The invention discloses a titanium dioxide rotary kiln multi-belt collaborative feeding automatic control system and control method, and belongs to the technical field of chemical automation control. The system comprises a signal detection unit, an execution unit and a control unit; the signal detection unit acquires a pressure maintaining signal of the filter press, a plate unloading program state signal, a belt running state signal and a material existence signal in real time; a lower plate and belt linkage control program and a belt switching automatic control program are operated, the linkage program achieves automatic linkage of plate unloading of the filter press and starting and stopping of the exclusive belt, and the switching program judges the material conveying state based on a multi-dimensional signal and controls orderly switching of the belt, so that it is ensured that materials of only one filter press are conveyed to the kiln entering belt at the same time; the problems of unstable feeding, high mixing risk, high labor intensity and the like caused by dependence on manual operation in the prior art are solved, automatic control of multi-belt collaborative feeding is realized, and the production efficiency, the product quality and the production safety are improved.

Description

Technical Field

[0001] This invention relates to the field of chemical automation control technology, specifically to an automatic control system and control method for a filter press belt conveyor process. Background Technology

[0002] In the sulfuric acid process for titanium dioxide production, the rotary kiln is one of the key pieces of equipment. To ensure production continuity and kiln utilization efficiency, a rotary kiln is usually equipped with at least two diaphragm filter presses. The dehydrated metatitanic acid filter cake is transported to a shared inlet belt conveyor via their respective dedicated belt conveyors and is finally sent into the kiln for calcination.

[0003] However, the existing material handling process has a low level of automation, mainly relying on on-site manual operation or partial remote manual control, which has many technical shortcomings: Firstly, the material supply stability is poor. The timeliness and accuracy of manual judgment on whether the material on the belt is being transported clean are insufficient, which can easily lead to material supply interruption or mixing of materials from two filter presses on the shared belt, seriously affecting the stability of the calcination process and product quality. Secondly, the operation is risky and labor-intensive. When manually switching multiple belts, operators are prone to misoperation under fatigue, which can lead to equipment failures such as belt blockage and motor overload. At the same time, operators need to continuously monitor and intervene, resulting in a heavy workload. Third, production efficiency is limited, and the time delays in manual judgment and operation reduce equipment utilization and the smoothness of the overall production process. Therefore, there is an urgent need for an automated control system and method to solve the series of problems caused by reliance on manual operation and to achieve orderly control of multi-belt collaborative feeding. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for a pre-reinforced seepage-proof mine chute, aiming to solve the aforementioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kilns, used in a production line with at least two diaphragm filter presses and multiple conveyor belts in a rotary calcining kiln, comprising: The signal detection unit is used to collect status signals from the production site in real time. The execution unit includes a dedicated belt conveyor drive device that is matched with the diaphragm filter press; The control unit adopts a DCS control system and establishes signal connections with the signal detection unit and the execution unit respectively. The control unit is configured to run the lower plate and belt linkage control program and the belt switching automatic control program. The status signals collected by the signal detection unit include: the pressure holding signal of the diaphragm filter press, the unloading program status signal, the operating status signal of the dedicated belt conveyor drive device, and the material presence / absence signal generated by the material detection device installed on the dedicated belt conveyor; The lower plate and belt linkage control program is used to automatically start its dedicated belt conveyor when a diaphragm filter press enters the unloading stage, and automatically stop the belt conveyor after detecting that there is no material on the dedicated belt conveyor. The automatic belt switching control program is used to automatically determine and control the operation and stop of the belt based on the unloading status of at least two of the diaphragm filter presses and whether there is a material signal on each corresponding dedicated belt, so as to ensure that only one of the diaphragm filter presses delivers material to the kiln feed belt at any given time.

[0006] Furthermore, the material detection device includes a limit switch, which is installed at the material height detection push rod at the end of the material conveying path of the dedicated belt conveyor. The material height detection push rod triggers the limit switch by interfering with the material on the dedicated belt conveyor, and is used to determine whether there is residual material on the belt conveyor.

[0007] Furthermore, the triggering conditions for the lower plate and belt linkage control program are as follows: when the pressure holding signal of the target diaphragm filter press is OFF, the diaphragm filter press is in the unloading state of "releasing plate", "removing plate" or "pulling plate"; and the dedicated belt conveyors corresponding to other diaphragm filter presses are in the running state.

[0008] Furthermore, the judgment logic of the automatic belt switching control program is as follows: real-time monitoring of whether there is a signal change in the material on each belt conveyor; combined with the pressure holding signal of the target diaphragm filter press, determining whether the material conveying is completed; when it is determined that the material conveying of its dedicated belt conveyor is completed, the dedicated belt conveyor is automatically stopped; if other diaphragm filter presses are in the unloading state, their corresponding dedicated belt conveyors are started.

[0009] Furthermore, the signal connection between the control unit and the signal detection unit and the execution unit can be a wired connection or a wireless communication connection.

[0010] An automatic control method for multi-belt coordinated feeding in a titanium dioxide rotary kiln includes the following steps: Step 1: The signal detection unit collects the status signals of the production site in real time, including the pressure holding signals of at least two diaphragm filter presses, the unloading procedure status signals, the dedicated belt conveyor operation status signals of each diaphragm filter press, and the material presence or absence signals of the material detection device, and transmits the collected signals to the control unit. Step 2: The control unit runs the lower plate and belt linkage control program. When it detects that a certain diaphragm filter press meets the linkage triggering conditions, it automatically starts its dedicated belt conveyor. After it detects that there is no material on the dedicated belt conveyor, it automatically stops the belt conveyor. Step 3: The control unit runs the belt switching automatic control program. Based on the unloading status of each diaphragm filter press and the signal changes of whether there is material on each dedicated belt conveyor, combined with the pressure holding signal of each diaphragm filter press, it judges the material conveying completion status and automatically controls the operation and stop switching of each dedicated belt conveyor to ensure that only one diaphragm filter press's dedicated belt conveys material to the kiln feed belt conveyor at the same time. Step 4: Repeat steps 1 to 3 to achieve continuous automatic control of multi-belt coordinated feeding and ensure stable material supply to the rotary kiln.

[0011] Furthermore, the linkage triggering condition mentioned in step 2 is as follows: when the pressure holding signal of the target diaphragm filter press is OFF, the unloading program status signal of the diaphragm filter press is displayed as "releasing plate", "removing plate" or "pulling plate"; the dedicated belt conveyor running status signal of other diaphragm filter presses is displayed as running.

[0012] Furthermore, the specific judgment steps for belt switching in step 3 are as follows: Step 3.1: Monitor the material detection device signals of all dedicated belt conveyors in real time. When the limit switch signal of the material detection device changes from ON to OFF and continues for a set time, it is determined that the material conveying on the belt conveyor is completed. Step 3.2: Detect the pressure holding signal of the target diaphragm filter press. If the pressure holding signal is OFF, stop its dedicated belt conveyor directly. If the pressure holding signal is ON, output the diaphragm filter press lower plate completion signal and set it to OFF, then stop the dedicated belt conveyor. Step 3.3: Detect the unloading program status signal of other diaphragm filter presses, start the dedicated belt conveyor of the diaphragm filter press that is in the unloading state, and complete the belt switching.

[0013] Furthermore, the time range for step 3.1 is 30 seconds to 5 minutes.

[0014] The beneficial effects of this invention are: 1. Ensure production continuity and stability: The DCS control system collects multi-dimensional status signals in real time, and combines the lower plate and belt linkage control program and the belt switching automatic control program to achieve seamless connection between filter press unloading and belt conveying and multi-belt staggered feeding, ensuring continuous and stable feeding to the rotary kiln, avoiding material accumulation or material interruption, and providing reliable guarantee for the calcination process.

[0015] 2. Eliminate the risk of material mixing and improve product quality: The belt switching logic strictly ensures that only one filter press's dedicated belt conveys material to the kiln feed belt at any given time, completely solving the material mixing problem caused by manual switching errors and significantly improving the consistency and stability of product quality.

[0016] 3. Achieve unmanned operation, reduce safety risks and labor intensity: The entire process of feeding, conveying and belt switching is fully automated, without the need for continuous monitoring and manual intervention by operators, which greatly reduces the probability of human error, reduces the risk of equipment failure, and at the same time reduces the workload of operators and improves production safety.

[0017] 4. Improve production efficiency and equipment utilization: The automated system responds quickly, avoiding the time delay caused by manual judgment and operation, optimizing the collaborative workflow of multiple devices, and improving the utilization rate of equipment such as filter presses and belt conveyors, thereby improving overall production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system structure of the present invention; Figure 2 This is a side view of the proprietary belt conveyor structure of the present invention.

[0019] The attached diagram includes the following reference numerals: 1. Diaphragm filter press; 2. Dedicated belt conveyor; 3. Kiln feed belt conveyor; 4. Material height detection push rod; 5. Limit switch. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is 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. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0021] Example: like Figure 1-2 As shown, this embodiment provides an automatic control system and control method for the belt conveyor process of a filter press; This system is used in a production line with "at least two diaphragm filter presses 1 and their dedicated belt conveyors 2 and one inlet belt conveyor 3 in a rotary kiln". The core objective is to achieve staggered feeding of multiple dedicated belt conveyors 2 to the inlet belt conveyor 3 through automatic control, so as to avoid material accumulation / interruption and ensure continuous and stable feeding of the rotary kiln (dedicated belt conveyor 2 is responsible for conveying the filter cake of the corresponding diaphragm filter press 1 to the inlet belt conveyor 3, and the inlet belt conveyor 3 finally sends the material into the rotary kiln).

[0022] This system mainly includes: a signal detection unit for real-time acquisition of status signals from the production site; an execution unit, including a dedicated belt conveyor 2 drive device matched with the diaphragm filter press 1; and a control unit, employing a DCS control system, which establishes signal connections with the signal detection unit and the execution unit respectively. The control unit is configured to run the lower plate and belt linkage control program and the belt switching automatic control program. The status signals acquired by the signal detection unit include: the pressure holding signal of the diaphragm filter press 1, the unloading program status signal, the operating status signal of the dedicated belt conveyor 2 drive device, and the status signals installed on the dedicated belt conveyor 2 drive device. The material detection device on the belt conveyor 2 generates a signal indicating the presence or absence of material. The lower plate and belt linkage control program automatically starts the dedicated belt conveyor 2 when a diaphragm filter press 1 enters the unloading stage, and automatically stops the belt conveyor 2 after detecting that there is no material on the dedicated belt conveyor 2. The belt switching automatic control program automatically judges and controls the operation and stop of the belt based on the unloading status of at least two diaphragm filter presses 1 and the presence or absence of material signal on each corresponding dedicated belt conveyor 2, ensuring that only one belt corresponding to a diaphragm filter press 1 conveys material to the kiln feed belt conveyor 3 at the same time. The material detection device includes a limit switch 5, which is installed at the material height detection push rod 4 at the end of the material conveying path of the dedicated belt conveyor 2. The material height detection push rod 4 triggers the limit switch 5 by interfering with the material on the dedicated belt conveyor 2, which is used to determine whether there is residual material on the belt conveyor.

[0023] The core workflow of this system is explained in four parts below: Phase 1: Real-time acquisition of signals across the entire scene. The signal detection unit acquires all key status signals of the production site at a preset frequency and transmits them to the DCS control unit. The acquired content includes: filter press status signals: "pressure holding signal" of each diaphragm filter press 1 (ON = in pressure holding / filtration stage, OFF = pressure holding released / can enter the unloading stage); "unloading program status signal" of each diaphragm filter press 1 (including 4 states: "loosening plate", "removing plate", "pulling plate", "unloading completed", the first 3 are collectively referred to as "unloading stage").

[0024] Belt status signals: “Operating status signal” (ON=Running, OFF=Stopped) for each dedicated belt conveyor 2; “Material presence / absence signal” on each dedicated belt conveyor 2 (triggered by end limit switch 5: material contacts material height detection push rod 4 → limit switch 5 ON=Material present, no material present → material height detection push rod 4 reset → limit switch 5 OFF=No material present); “Operating status signal” (ON=Normal operation, OFF=Stopped / Faulted, as a prerequisite for material supply) for the kiln feed belt conveyor 3.

[0025] Phase 2: Lowering Plate and Belt Interlock Control (DCS Control Unit Executes Interlock Program) When a diaphragm filter press 1 meets the "interlock trigger condition", the DCS automatically starts its corresponding dedicated belt conveyor 2 to achieve "synchronous linkage between plate unloading and belt conveying". Specific logic: Interlock trigger condition (must be met simultaneously): Target filter press: Pressure holding signal OFF (pressure holding is released, conditions for plate unloading are met) + Plate unloading program status signal is "loosening plate / removing plate / pulling plate" (entering the plate unloading stage, the filter cake is about to fall); Kiln inlet belt conveyor 3: Running status signal ON (ensuring that the material can be smoothly fed into the rotary kiln to avoid accumulation); Dedicated belt conveyor 2 of other diaphragm filter press 1: either "not running" or "although running, it has been determined that the material conveying is completed (to be stopped)". Linked execution actions: If other dedicated belt conveyors 2 are not running: directly start the dedicated belt conveyor 2 of the target diaphragm filter press 1 to receive the filter cake dropped from the unloading plate; if there is a dedicated belt conveyor 2 in operation: wait for the "material presence / absence signal" of the running belt to become OFF and continue for a "set time" (pre-calculated according to the belt conveying speed and length, such as a conveying speed of 1m / s and a length of 5m, then the set time is ≥5s to ensure that the residual material on the belt completely enters the inlet belt conveyor 3) before starting the dedicated belt conveyor 2 of the target diaphragm filter press 1; when the "material presence / absence signal" of the dedicated belt conveyor 2 of the target diaphragm filter press 1 becomes OFF and continues for a set time (confirming that there is no residual material), the DCS automatically stops the dedicated belt conveyor 2.

[0026] Phase 3: Automatic Control of Multi-Belt Switching (DCS Control Unit Executes Switching Program) After a dedicated belt conveyor 2 completes material conveying, the system automatically determines whether to start the next dedicated belt conveyor 2 to ensure continuous material supply from the kiln conveyor 3 without conflict. Specific steps: Step 1: Determine if the current belt material conveying is complete. The DCS monitors the "material presence / absence signal" of the currently running dedicated belt conveyor 2 in real time: If the signal changes from ON to OFF and continues for a "set time," it is simultaneously confirmed by the "pressure holding signal" of the corresponding diaphragm filter press 1 (pressure holding signal OFF → diaphragm filter press 1 has no filter cake to unload; if the pressure holding signal is still ON → first output the "filter press lower plate completion signal" and set it to OFF, then determine if conveying is complete), ultimately confirming that there is no material residue on the current belt. Step 2: Stop the current dedicated belt conveyor 2. After confirming the conveying is complete, the DCS sends a stop command to the "start / stop control module" of the current dedicated belt conveyor 2, the execution unit drives the belt to stop, and simultaneously feeds back the "operating status signal" to the DCS. Step 3: Start the next dedicated belt conveyor 2 (by priority). The DCS traverses the status of other diaphragm filter presses 1: selects the diaphragm filter press 1 with "pressure holding signal OFF + unloading program status is in the process of loosening / removing / pulling plates" (i.e., waiting to unload). According to the rule of "first to enter the unloading stage first" (e.g., if diaphragm filter press 1A enters the unloading stage 10 seconds earlier than diaphragm filter press 1B, then A's dedicated belt conveyor 2 will be started first), and sends a start command to the start / stop control module of the corresponding dedicated belt conveyor 2 to complete the belt switching.

[0027] Phase 4: The "Operating Status Feedback Module" of the execution feedback and loop control unit continuously feeds back the real-time operating status (such as start / stop, fault) of the dedicated belt conveyor 2 and the kiln feed belt conveyor 3 to the DCS: If a dedicated belt conveyor 2 malfunctions (such as abnormal operating status signal): the DCS suspends the control of that belt, skips that belt, and directly starts the dedicated belt conveyor 2 of the next diaphragm filter press 1 to be unloaded; If the kiln feed belt conveyor 3 stops (operating status signal OFF): the DCS immediately stops all dedicated belt conveyors 2, and after the kiln feed belt conveyor 3 resumes operation (signal ON), it restarts the dedicated belt conveyor 2 according to the linkage / switching program; the system cyclically executes the process of "signal acquisition → linkage control → switching control → status feedback" to realize continuous automation of multi-belt collaborative feeding.

[0028] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kiln, characterized in that, A production line for a rotary calcining kiln equipped with at least two diaphragm filter presses and multiple conveyor belts includes: The signal detection unit is used to collect status signals from the production site in real time. The execution unit includes a dedicated belt conveyor drive device that is matched with the diaphragm filter press; The control unit adopts a DCS control system and establishes signal connections with the signal detection unit and the execution unit respectively. The control unit is configured to run the lower plate and belt linkage control program and the belt switching automatic control program. The status signals collected by the signal detection unit include: the pressure holding signal of the diaphragm filter press, the unloading program status signal, the operating status signal of the dedicated belt conveyor drive device, and the material presence / absence signal generated by the material detection device installed on the dedicated belt conveyor; The lower plate and belt linkage control program is used to automatically start its dedicated belt conveyor when a diaphragm filter press enters the unloading stage, and automatically stop the belt conveyor after detecting that there is no material on the dedicated belt conveyor. The automatic belt switching control program is used to automatically determine and control the operation and stop of the belt based on the unloading status of at least two of the diaphragm filter presses and whether there is a material signal on each corresponding dedicated belt, so as to ensure that only one of the diaphragm filter presses delivers material to the kiln feed belt at any given time.

2. The automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 1, characterized in that, The material detection device includes a limit switch, which is installed at the material height detection push rod at the end of the material conveying path of the dedicated belt conveyor. The material height detection push rod triggers the limit switch by interfering with the material on the dedicated belt conveyor, and is used to determine whether there is residual material on the belt conveyor.

3. The automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 1, characterized in that, The triggering conditions for the lower plate and belt linkage control program are as follows: when the pressure holding signal of the target diaphragm filter press is OFF, the diaphragm filter press is in the unloading state of "releasing plate", "removing plate" or "pulling plate"; and the dedicated belt conveyors corresponding to other diaphragm filter presses are in the running state.

4. The automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 1, characterized in that, The judgment logic of the automatic belt switching control program is as follows: real-time monitoring of whether there is a signal change in the material on each belt conveyor; combined with the pressure holding signal of the target diaphragm filter press, determining whether the material conveying is completed; when it is determined that the material conveying of its dedicated belt conveyor is completed, the dedicated belt conveyor is automatically stopped; if other diaphragm filter presses are in the unloading state, their corresponding dedicated belt conveyors are started.

5. The automatic control system for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 1, characterized in that, The control unit is connected to the signal detection unit and the execution unit via either a wired connection or a wireless connection.

6. An automatic control method for multi-belt coordinated feeding in a titanium dioxide rotary kiln, characterized in that, The automatic control system based on any one of claims 1 to 5 includes the following steps: Step 1: The signal detection unit collects the status signals of the production site in real time, including the pressure holding signals of at least two diaphragm filter presses, the unloading procedure status signals, the dedicated belt conveyor operation status signals of each diaphragm filter press, and the material presence or absence signals of the material detection device, and transmits the collected signals to the control unit. Step 2: The control unit runs the lower plate and belt linkage control program. When it detects that a certain diaphragm filter press meets the linkage triggering conditions, it automatically starts its dedicated belt conveyor. After it detects that there is no material on the dedicated belt conveyor, it automatically stops the belt conveyor. Step 3: The control unit runs the belt switching automatic control program. Based on the unloading status of each diaphragm filter press and the signal changes of whether there is material on each dedicated belt conveyor, combined with the pressure holding signal of each diaphragm filter press, it judges the material conveying completion status and automatically controls the operation and stop switching of each dedicated belt conveyor to ensure that only one diaphragm filter press's dedicated belt conveys material to the kiln feed belt conveyor at the same time. Step 4: Repeat steps 1 to 3 to achieve continuous automatic control of multi-belt coordinated feeding and ensure stable material supply to the rotary kiln.

7. The automatic control method for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 6, characterized in that, The linkage triggering condition mentioned in step 2 is as follows: when the pressure holding signal of the target diaphragm filter press is OFF, the unloading program status signal of the diaphragm filter press is displayed as "loosening plate", "removing plate" or "pulling plate"; the dedicated belt conveyor running status signal of other diaphragm filter presses is displayed as running.

8. The automatic control method for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 6, characterized in that, The specific judgment steps for belt switching in step 3 are as follows: Step 3.1: Monitor the material detection device signals of all dedicated belt conveyors in real time. When the limit switch signal of the material detection device changes from ON to OFF and continues for a set time, it is determined that the material conveying on the belt conveyor is completed. Step 3.2: Detect the pressure holding signal of the target diaphragm filter press. If the pressure holding signal is OFF, stop its dedicated belt conveyor directly. If its pressure holding signal is ON, the output of the diaphragm filter press lower plate completion signal will be set to OFF, and the dedicated belt conveyor will stop starting. Step 3.3: Detect the unloading program status signal of other diaphragm filter presses, start the dedicated belt conveyor of the diaphragm filter press that is in the unloading state, and complete the belt switching.

9. The automatic control method for multi-belt coordinated feeding of titanium dioxide rotary kiln according to claim 8, characterized in that, The time range for step 3.1 is 30 seconds to 5 minutes.

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