Cigarette strip flexible conveying and early warning system and method based on dynamic priority control

Abstract

The invention discloses a cigarette carton flexible conveying and early warning system and method based on dynamic priority control, and belongs to the technical field of cigarette packaging production control. The system comprises a PLC, a photoelectric coupler, a first photoelectric switch and a second photoelectric switch; the first optoelectronic switch and the second optoelectronic switch monitor the cigarette carton flow in the cigarette carton conveying channel, and the PLC comprehensively judges and analyzes cigarette carton flow signals, case filling and sealing machine operation state signals and high-position carton storage device state signals, increases or decreases the priority of the high-position carton storage device and controls the cigarette carton conveying channel to convey cigarette cartons to the cigarette carton conveying channel. And the high-position carton storage device is controlled to store or release the cigarette cartons. The functions of monitoring the cigarette bar flow in the conveying channel, dynamically controlling cigarette bar storage or release of the high-position bar storage device, cooperatively linking with the case filling and sealing machine and the like are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cigarette packaging production control, and more specifically, to a cigarette rod flexible conveying and early warning system and method based on dynamic priority control. Background Art

[0002] In the tobacco production line, it is crucial to ensure the smoothness, efficiency and quality stability of the tobacco rods from production to packing. After the packaging machine completes the packaging of the tobacco rods, they enter the box filling and sealing machine through the tobacco rod conveying channel for box packaging. When the box filling and sealing machine is stopped, the high-level rod storage device completes the storage of the tobacco rods in the conveying channel; when the box filling and sealing machine is running, the high-level rod storage device does not store tobacco rods; at the same time, when there are tobacco rods stored in the high-level rod storage device, when the box filling and sealing machine is running, the tobacco rods will be released and output regularly. Every time the high-level rod storage device releases a row of tobacco rods, the tobacco rods are conveyed downward from the high-level rod storage device with a height of H through the conveying channel. Due to inertia and belt conveyor, when the above-mentioned tobacco rods pass through the appearance inspection of the tobacco rods on the conveying channel, various faults such as many false rejections and blockage of the rejection mechanism are caused due to the continuous tobacco rods, and tobacco rod quality problems are easily caused. There is a risk that tobacco rods with quality problems will flow into the next process.

[0003] Currently, the research mainly focuses on the conversion of cigarette rod flow, and there is a lack of research on the coordinated work of high-level cigarette rod storage devices, box filling and sealing machines, cigarette rod appearance inspection devices, and the cigarette rod flow in the conveying channel. Summary of the invention

[0004] An object of the present invention is to provide a flexible tobacco rod conveying and early warning system and method based on dynamic priority control, so as to solve the problem that when the aforementioned high-level tobacco rod storage device releases tobacco rods, the appearance detection of tobacco rods on the tobacco rod conveying channel may cause false detection, rejection blockage and other faults due to tobacco rod connection, without effective monitoring and coordinated linkage control.

[0005] According to a first aspect of the present invention, a tobacco rod flexible conveying and warning system based on dynamic priority control is provided, comprising a PLC controller, a photoelectric coupler, a first photoelectric switch and a second photoelectric switch, wherein the first photoelectric switch and the second photoelectric switch are both installed on a tobacco rod conveying channel through a mounting bracket, the photoelectric coupler and the PLC controller are both installed in a high-position tobacco rod storage device, the output ends of the first photoelectric switch and the second photoelectric switch are both connected to the input end of the PLC controller, the output end of the PLC controller is connected to the control end of the photoelectric coupler, and the PLC controller is also connected to a communication connection with an upper monitoring device; wherein:

[0006] The first photoelectric switch and the second photoelectric switch monitor the flow of cigarette rods in the cigarette rod conveying channel, and the PLC controller makes a comprehensive judgment and analysis on the cigarette rod flow signal, the carton sealing machine operation status signal, and the high-level storage device status signal, raises or lowers the priority of the high-level storage device, and controls the high-level storage device to store or release cigarette rods.

[0007] Optionally, the high-position rod storage device is installed at the entrance of the tobacco rod conveying channel, and the high-position rod storage device grabs or releases the tobacco rods on the tobacco rod conveying channel through a mechanical gripper.

[0008] Optionally, a cigarette rod appearance detection device is also installed on the cigarette rod conveying channel, and the cigarette rod appearance detection device is arranged downstream of the high-position cigarette rod storage device.

[0009] Optionally, the second photoelectric switch and the first photoelectric switch are installed in sequence between the high-position tobacco rod storage device and the tobacco rod appearance detection device along the conveying direction of the tobacco rod conveying channel.

[0010] Optionally, a rejection mechanism is also installed on the tobacco rod conveying channel, and the rejection mechanism is arranged downstream of the tobacco rod appearance detection device.

[0011] Optionally, the upper monitoring device includes an alarm, and the alarm is connected to the PLC controller by signal, and the PLC controller controls the alarm to give an audible and visual alarm when the tobacco rod flow is stagnant.

[0012] According to a second aspect of the present invention, a method for flexible tobacco transport and early warning based on dynamic priority control is provided, comprising:

[0013] Flow monitoring step: the first photoelectric switch and the second photoelectric switch monitor the flow of the cigarette rods in the cigarette rod conveying channel to obtain a cigarette rod flow signal;

[0014] Status judgment step: the PLC controller performs comprehensive judgment and analysis based on the cigarette rod flow rate signal, combined with the operation status signal of the carton filling and sealing machine and the status signal of the high-level cigarette rod storage device;

[0015] Flow control steps: The PLC controller increases or decreases the priority of the high-level storage device according to the results of comprehensive judgment and analysis to control the high-level storage device to store or release cigarette rods.

[0016] Optionally, the tobacco rod flexible conveying and early warning method based on dynamic priority control further includes:

[0017] When the first photoelectric switch is continuously blocked for a period of time T1≥t1, it indicates that the flow rate of tobacco rods has increased; at the same time, the signal of the second photoelectric switch is collected. When the second photoelectric switch is continuously blocked for a period of time T2≥t2 and T1≥t1, it indicates that the flow rate of tobacco rods in the conveying channel is large and the tobacco rods have accumulated at the second photoelectric switch. At this time, the priority of the high-level storage device is increased, so that the high-level storage device stores tobacco rods, and the upper monitoring device performs interface display and sound and light warning;

[0018] If T2≥t2 and T1≥t1 are not satisfied at the same time, it means that the flow of tobacco rods in the conveying channel is large, but has not accumulated to the second photoelectric switch. At this time, the priority of the high-level accumulator remains unchanged and the high-level accumulator does not operate;

[0019] When the first photoelectric switch is continuously blocked for a period of time T1 < t1, it indicates that the flow of cigarette rods is normal. At this time, the priority of the high-position accumulator is reduced, and the high-position accumulator starts to release cigarette rods;

[0020] Wherein, t1 and t2 are time thresholds of the first photoelectric switch and the second photoelectric switch being continuously blocked, respectively.

[0021] Optionally, the length, width and height of the cigarette rod are set to L, W and h respectively, the time for a single cigarette rod to pass through the optical fiber is W / V, V is the belt running speed and is a constant value; then t1=5W / V, t2=3W / V.

[0022] Optionally, the state determination step further includes:

[0023] When the running signal of the carton packing and sealing machine is collected, the judgment module of the PLC controller is entered, that is, the priority of the high-level accumulator is judged by using the cigarette flow information collected by the first photoelectric switch and the second photoelectric switch;

[0024] If no operating signal of the carton filling and sealing machine is collected, the priority of the high-level cigarette storage device is directly increased so that the high-level cigarette storage device can store cigarette rods.

[0025] The tobacco rod flexible conveying and early warning system and method based on dynamic priority control disclosed in the present invention have the following technical effects:

[0026] Photoelectric switches are used to automatically collect tobacco rod flow information, and logical judgment is performed based on preset time thresholds (t1, t2) to achieve online real-time monitoring and control of tobacco rod flow in the conveying channel, eliminating the impact of sudden changes in tobacco rod flow on the stability and effectiveness of tobacco rod appearance inspection. This not only reduces the need for manual intervention, but also improves the accuracy and timeliness of control, ensures tobacco rod product quality, and reduces defective products;

[0027] The t1 and t2 time thresholds can be set according to different smoke flow rates to monitor the flow rates of cigarette strips in different states, so that the system can be flexibly adjusted according to different production needs, enhancing the adaptability and scalability of the system;

[0028] The upper interface can realize the sound and light warning reminder of large tobacco rod flow, and can automatically increase the priority of high-position tobacco rod storage for tobacco rod storage, which helps operators to timely discover and deal with potential production problems and ensure production safety;

[0029] It realizes functions such as monitoring the flow of cigarette rods in the conveying channel, dynamically controlling the storage or release of cigarette rods in the high-level storage device, and coordinating with the carton filling and sealing machine, ensuring that the flow of cigarette rods in the conveying channel remains at an appropriate level, avoiding blockage caused by excessive accumulation of cigarette rods or production stagnation caused by too little accumulation, thereby improving the conveying efficiency and stability of the entire production line, ensuring that the cigarette rods enter the cigarette rod appearance inspection smoothly, and reducing the quality risk of cigarette rods.

[0030] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 An architectural diagram of a tobacco rod flexible conveying and early warning system based on dynamic priority control provided by an embodiment of the present invention;

[0033] Figure 2 A distribution diagram of various devices in a tobacco rod conveying channel of a tobacco rod flexible conveying and early warning system based on dynamic priority control provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the installation position of the photoelectric switch detection of the tobacco rod flexible conveying and early warning system based on dynamic priority control provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the running state of cigarette rods in a cigarette rod conveying channel of a cigarette rod flexible conveying and early warning system based on dynamic priority control provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of a case filling and sealing machine signal prior judgment performed by a judgment module of a PLC controller of a cigarette rod flexible conveying and early warning method based on dynamic priority control provided by an embodiment of the present invention;

[0037] Figure 6A schematic diagram of cigarette rod flow and priority determination by a determination module of a PLC controller of a cigarette rod flexible conveying and early warning method based on dynamic priority control provided in an embodiment of the present invention.

[0038] The following are marked in the figure:

[0039] 1. Conveyor chain plate; 2. High-position cigarette rod storage device; 3. Mechanical gripper; 4. Conveying channel; 5. Cigarette rod appearance inspection device; 6. Rejection mechanism; 7. Case filling and sealing machine. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] In the prior art, due to inertia and belt conveyor, when the tobacco rods pass through the tobacco rod appearance inspection on the conveying channel 4, various faults such as many false rejections during the tobacco rod appearance inspection and blockage of the rejection mechanism 6 may occur due to the continuous tobacco rods, and tobacco rod quality problems may occur easily, and there is a risk that tobacco rods with quality problems will flow into the next process. The present application comprehensively analyzes and judges the actual state of the tobacco rods in the conveying channel 4, the operating signals of the box sealing machine 7 and the high-level storage device 2, and controls the high-level storage device 2 to release or store tobacco rods by increasing or decreasing the priority of the high-level storage device 2, so as to realize the linkage and coordinated work of the box sealing machine 7, the high-level storage device 2, and the tobacco rod appearance inspection device 5, the stable flow of tobacco rods in the conveying channel 4, and the stable and effective tobacco rod appearance inspection device 5.

[0045] The present invention proposes an embodiment of a tobacco rod flexible conveying and warning system based on dynamic priority control. Specifically, Figure 1As shown, it includes: a PLC controller, a photoelectric coupler, a first photoelectric switch and a second photoelectric switch, the first photoelectric switch and the second photoelectric switch are both installed on the tobacco rod conveying channel 4 through a mounting bracket, the photoelectric coupler and the PLC controller are both installed in the high-position accumulator 2, the output ends of the first photoelectric switch and the second photoelectric switch are both connected to the input end of the PLC controller, the output end of the PLC controller is connected to the control end of the photoelectric coupler, and the PLC controller is also connected to the upper monitoring device in communication; wherein:

[0046] The first photoelectric switch and the second photoelectric switch monitor the flow of cigarettes in the cigarette conveying channel 4. The PLC controller makes a comprehensive judgment and analysis on the flow signal of cigarettes, the operating status signal of the packing and sealing machine 7, and the status signal of the high-level storage device 2, and increases or decreases the priority of the high-level storage device 2, and controls the high-level storage device 2 to store or release cigarettes. For example, when the packing and sealing machine 7 fails or the flow of cigarettes is too large, the PLC controller will increase the priority of the high-level storage device 2 to temporarily store the excess cigarettes in the high-level storage device 2; when the packing and sealing machine 7 returns to normal or the flow of cigarettes decreases, the PLC will send a release signal to the high-level storage device 2 to release the stored cigarettes back to the cigarette conveying channel 4. The functions of the linkage and coordinated operation of the packing and sealing machine 7, the high-level storage device 2, and the cigarette appearance detection device 5, the stable flow of cigarettes in the conveying channel 4, and the stable and effective cigarette appearance detection device 5 are realized.

[0047] The first photoelectric switch and the second photoelectric switch are respectively installed at different positions of the tobacco rod conveying channel 4, and detect whether the tobacco rod passes through and the speed or quantity of passing through by emitting and receiving light beams. The use of two photoelectric switches can increase the accuracy and reliability of detection. By comparing the signals of the two switches, the flow state of the tobacco rod can be further confirmed and misjudgment can be reduced.

[0048] It should be noted that if Figure 2 As shown, the finished cigarette rods produced by the packaging machine enter the conveying channel 4 of the box filling and sealing machine 7 through the conveying chain plate 1, and then enter the box filling and sealing machine 7 for packaging. Among them, the cigarette rod appearance detection device 5, the high-level cigarette rod storage device 2, and the box filling and sealing machine 7 are independent devices. When the high-level cigarette rod storage device 2 releases the cigarette rods, a large number of cigarette rods enter the detection area of ​​the cigarette rod appearance detection device 5 from the height H under the action of the conveying belt and inertia, causing faults such as false detection, continuous rejection blockage at the rejection mechanism 6, and cigarette rod damage, which increases the product quality risk.

[0049] In the embodiment of the present invention, the high-position accumulator 2 is installed at the entrance of the tobacco rod conveying channel 4, and the high-position accumulator 2 grabs or releases the tobacco rods on the tobacco rod conveying channel 4 through the mechanical gripper 3. The combination of the high-position accumulator 2 and the mechanical gripper 3 enables the production line to flexibly respond to various changes in production demand, such as short shutdowns, flow fluctuations, etc.

[0050] In the embodiment of the present invention, a tobacco rod appearance detection device 5 is also installed on the tobacco rod conveying channel 4. The tobacco rod appearance detection device 5 is arranged downstream of the high-level rod storage device 2 and is used to perform online quality detection on the appearance quality of the tobacco rod. When the tobacco rod passes through the detection area, the tobacco rod appearance detection device 5 activates the light source to illuminate the surface of the tobacco rod and captures the image through a high-speed camera or a linear array scanning camera. Subsequently, the image is analyzed using an image processing algorithm to identify abnormal features that are inconsistent with the normal appearance of the tobacco rod.

[0051] In the embodiment of the present invention, Figure 3 As shown, along the conveying direction of the tobacco rod conveying channel 4, between the high-position accumulator 2 and the tobacco rod appearance detection device 5, the second photoelectric switch and the first photoelectric switch are installed in sequence. The first photoelectric switch is close to the tobacco rod appearance detection device 5 and is used to monitor the flow rate of the smaller tobacco rods in the conveying channel 4; the second photoelectric switch is installed near the high-position accumulator 2 and is used to monitor the maximum flow rate of the tobacco rods in the conveying channel 4.

[0052] In an embodiment of the present invention, a rejection mechanism 6 is also installed on the cigarette rod conveying channel 4. The rejection mechanism 6 is arranged downstream of the cigarette rod appearance detection device 5 to reject the cigarette rods with appearance defects detected by the cigarette rod appearance detection device 5, and the finished cigarette rods with qualified appearance quality are loaded into the box sealing machine 7 for box packing.

[0053] In an embodiment of the present invention, the upper monitoring device includes an alarm, which is connected to the PLC controller by signal. The PLC controller controls the alarm to give an audible and visual alarm when the tobacco rod flow is stagnant.

[0054] The present invention also provides an embodiment of a tobacco rod flexible conveying and early warning method based on dynamic priority control, comprising:

[0055] Flow monitoring steps: the first photoelectric switch and the second photoelectric switch monitor the flow of cigarette rods in the cigarette rod conveying channel 4 to obtain a cigarette rod flow signal; the first photoelectric switch is installed at the upstream position of the conveying channel 4 and is used to preliminarily monitor the flow of cigarette rods; the second photoelectric switch is installed at the downstream position of the conveying channel 4, which is closer to the conveying end point of the cigarette rods than the first photoelectric switch, and is also used to monitor the passage of cigarette rods, but can reflect the accumulation of cigarette rods in the channel.

[0056] Status judgment step: The PLC controller performs comprehensive judgment and analysis based on the cigarette rod flow signal, combined with the operation status signal of the packing and sealing machine 7 and the status signal of the high-level storage device 2;

[0057] Flow control steps: The PLC controller increases or decreases the priority of the high-level accumulator 2 according to the results of comprehensive judgment and analysis to control the high-level accumulator 2 to store or release cigarette rods.

[0058] In the embodiment of the present invention, Figure 6 As shown, the flexible tobacco transport and early warning method based on dynamic priority control also includes:

[0059] When the first photoelectric switch is continuously blocked for a period of time T1≥t1, it indicates that the flow rate of the tobacco rod increases; at the same time, the second photoelectric switch signal (i.e. Figure 6 Photoelectric switch 2 in the middle), when the second photoelectric switch is continuously blocked for time T2≥t2 and T1≥t1, it indicates that the flow of tobacco rods in the conveying channel 4 is not only large, but also that the tobacco rods have accumulated to the second photoelectric switch. In this case, the system increases the priority of the high-level storage device 2 and makes it start to store tobacco rods to relieve the flow pressure downstream. At the same time, the upper monitoring device performs interface display and sound and light warning to remind the operator to pay attention;

[0060] If T2≥t2 and T1≥t1 are not satisfied at the same time (for example, only T2≥t2 and T1<t1), although the flow of tobacco rods in the conveying channel 4 is large, it has not yet accumulated at the second photoelectric switch. At this time, in this case, the system keeps the priority of the high-level storage device 2 unchanged and does not trigger its storage action to avoid unnecessary intervention;

[0061] When the first photoelectric switch is continuously blocked for a period of time T1 < t1, it indicates that the tobacco rod flow rate is at a normal level. In this case, the system reduces the priority of the high-level storage device 2 and triggers it to release the previously stored tobacco rods into the conveying channel 4 to maintain a balanced and stable flow rate;

[0062] Wherein, t1 and t2 are respectively preset time thresholds of the first photoelectric switch and the second photoelectric switch being continuously blocked.

[0063] Specifically, when the first photoelectric switch is blocked continuously for more than 5 seconds, and the second photoelectric switch is not blocked continuously, it indicates that the flow of tobacco rods in the conveying channel 4 increases, and the high-position storage device 2 does not operate; when the first photoelectric switch is blocked continuously for more than 5 seconds, and the second photoelectric switch is blocked continuously for more than 3 seconds, it indicates that the flow of tobacco rods in the conveying channel 4 is large, and the priority of the high-position storage device 2 is increased, and the high-position storage device 2 starts to store tobacco rods; when the second photoelectric switch is not blocked continuously, and the first photoelectric switch is blocked continuously for more than 5 seconds, the high-position storage device 2 does not operate; when the second photoelectric switch is not blocked continuously, and the first photoelectric switch is not blocked continuously, the priority of the high-position storage device 2 is increased, and the high-position storage device 2 releases tobacco rods. Dynamic monitoring of the flow of tobacco rods in the conveying channel 4 is achieved through the signals of the two photoelectric switches in the conveying channel 4.

[0064] In the embodiment of the present invention, Figure 4As shown, the length, width and height of the cigarette rod size are set to L, W and h respectively, the time for a single cigarette rod to pass through the optical fiber is W / V, V is the belt running speed, which is determined by the motor running speed and is a constant value; according to the mechanical position of the cigarette rod appearance detection device 5 and the actual production situation, the time thresholds for the first photoelectric switch and the second photoelectric switch to be continuously blocked are set to t1 and t2 respectively. These two values ​​are set according to the actual production situation and the mechanical position, and are used to determine whether the cigarette rod passes through the detection area continuously and normally; t1 is about the time for 5 cigarette rods to pass through the optical fiber continuously, and similarly, t2 is about the time for 3 cigarette rods to pass through the optical fiber continuously, t1=5W / V, which is approximately equal to the time for 5 cigarette rods to pass continuously; t2=3W / V, which is approximately equal to the time for 3 cigarette rods to pass continuously. By comparing the actual detected continuous passage time of the cigarette rod with the set time thresholds (t1 and t2), the production line can determine whether the flow of the cigarette rod is normal, whether there is a blockage, missing or abnormal speed. If the detected time exceeds or falls below the threshold, the production line can automatically adjust or issue an alarm to ensure the continuity of production and the stability of product quality.

[0065] In the embodiment of the present invention, Figure 5 As shown, in the state determination step, it also includes:

[0066] When the running signal of the carton packing and sealing machine 7 is collected, indicating that the carton packing and sealing machine 7 is running, the judgment module of the PLC controller is entered. In the judgment module, the tobacco rod flow information collected by the first photoelectric switch and the second photoelectric switch is used to judge the priority of the high-level storage device 2. According to different priorities, the high-level storage device 2 performs corresponding actions (storing or releasing tobacco rods);

[0067] If no operation signal of the carton filling and sealing machine 7 is collected, it indicates that the carton filling and sealing machine 7 is not running. At this time, the judgment module of the PLC controller is entered to directly increase the priority of the high-level cigarette storage device 2 so that the high-level cigarette storage device 2 can store cigarette rods.

[0068] Specifically, the priority of the high-position accumulator 2 is adjusted according to the flow rate of the tobacco rods. The normal state (no action) of the high-position accumulator 2 is 1, the storage state is 2, and the release state is 0. The tobacco rod flow rate is judged by the photoelectric switch to analyze the priority of the state of the high-position accumulator 2, and then different actions of the high-position accumulator 2 are realized to ensure the suitability of the tobacco rod flow rate in the conveying channel 4 and the flexible and stable conveying of the tobacco rods. Specifically, the state code is 1, indicating that the high-position accumulator 2 is not currently performing any specific action, that is, it is neither storing tobacco rods nor releasing tobacco rods, but is in a standby or idle state; the state code is 2, indicating that the high-position accumulator 2 is receiving or storing tobacco rods from the upstream; the state code is 0, and the high-position accumulator 2 will release the previously stored tobacco rods to the downstream conveying channel 4 to supplement or adjust the flow rate of tobacco rods. By dynamically adjusting the state of the high-position accumulator 2, it is ensured that the flow rate of tobacco rods in the conveying channel 4 is always kept within an appropriate range, neither too much nor too little, so as to meet the continuity and stability requirements of the production line.

[0069] It should be noted that the information interaction, execution process and other contents between the above steps are based on the same concept as the system embodiment of the present application, and are methods corresponding to the above-mentioned flexible tobacco transport and early warning system based on dynamic priority control. All implementation structures in the above-mentioned system embodiment are applicable to the embodiment of the method. Its specific functions and technical effects can be found in the method embodiment part, which will not be repeated here.

[0070] The present invention aims at the problem that when the existing high-position accumulator 2 releases tobacco rods, the appearance detection of tobacco rods on the tobacco rod conveying channel 4 may cause false detection, rejection blockage and other faults due to the connection of tobacco rods, but there is no effective monitoring and coordinated linkage control. The present invention realizes the functions of monitoring the flow of tobacco rods in the conveying channel 4, dynamically controlling the storage or release of tobacco rods by the high-position accumulator 2, and coordinating with the box filling and sealing machine 7, so as to ensure that the flow of tobacco rods in the conveying channel 4 is maintained at an appropriate level, avoid blockage caused by excessive accumulation of tobacco rods or production stagnation caused by too little accumulation of tobacco rods, thereby improving the conveying efficiency and stability of the entire production line, ensuring that tobacco rods enter the appearance detection of tobacco rods smoothly, and reducing the quality risk of tobacco rods. The photoelectric switch is used to automatically collect the flow information of tobacco rods, and logical judgment is performed in combination with the preset time threshold (t1, t2), so as to realize the online real-time monitoring and control of the flow of tobacco rods in the conveying channel 4, and prevent the influence of sudden changes in the flow of tobacco rods on the stability and effectiveness of the appearance detection of tobacco rods. The t1 and t2 time thresholds can be set according to different smoke flow rates to monitor the flow rates of cigarette strips in different states, so that the system can be flexibly adjusted according to different production needs, enhancing the adaptability and scalability of the system. The upper interface can be used to provide sound and light warning reminders for large cigarette strip flow rates, and the high-level storage device 2 can be automatically upgraded to a higher priority for cigarette strip storage, which helps operators to promptly discover and handle potential production problems and ensure production safety.

[0071] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A tobacco rod flexible conveying and early warning system based on dynamic priority control, characterized in that: It comprises a PLC controller, a photoelectric coupler, a first photoelectric switch and a second photoelectric switch. The first photoelectric switch and the second photoelectric switch are both installed on the tobacco rod conveying channel through a mounting bracket. The photoelectric coupler and the PLC controller are both installed in a high-position tobacco rod storage device. The output ends of the first photoelectric switch and the second photoelectric switch are both connected to the input end of the PLC controller. The output end of the PLC controller is connected to the control end of the photoelectric coupler. The PLC controller is also connected to the upper monitoring device for communication; wherein: The first photoelectric switch and the second photoelectric switch monitor the flow of cigarette rods in the cigarette rod conveying channel, and the PLC controller makes a comprehensive judgment and analysis on the cigarette rod flow signal, the carton sealing machine operation status signal, and the high-level storage device status signal, raises or lowers the priority of the high-level storage device, and controls the high-level storage device to store or release cigarette rods.

2. The tobacco rod flexible conveying and warning system based on dynamic priority control according to claim 1 is characterized in that: The high-position rod storage device is installed at the entrance of the tobacco rod conveying channel, and the high-position rod storage device grabs or releases the tobacco rods on the tobacco rod conveying channel through a mechanical gripper.

3. The tobacco rod flexible conveying and warning system based on dynamic priority control according to claim 1 is characterized in that: A cigarette rod appearance detection device is also installed on the cigarette rod conveying channel, and the cigarette rod appearance detection device is arranged downstream of the high-position cigarette rod storage device.

4. The tobacco rod flexible conveying and warning system based on dynamic priority control according to claim 3 is characterized in that: The second photoelectric switch and the first photoelectric switch are installed in sequence along the conveying direction of the tobacco rod conveying channel and between the high-position tobacco rod storage device and the tobacco rod appearance detection device.

5. The tobacco rod flexible conveying and warning system based on dynamic priority control according to claim 3 is characterized in that: A rejecting mechanism is also installed on the tobacco rod conveying channel, and the rejecting mechanism is arranged downstream of the tobacco rod appearance detection device.

6. The tobacco rod flexible conveying and warning system based on dynamic priority control according to claim 1 is characterized in that: The upper monitoring device includes an alarm, which is connected to the PLC controller by signal. The PLC controller controls the alarm to give an audible and visual alarm when the tobacco rod flow is stagnant.

7. A flexible tobacco delivery and early warning method based on dynamic priority control, characterized in that: include: Flow monitoring step: the first photoelectric switch and the second photoelectric switch monitor the flow of the cigarette rods in the cigarette rod conveying channel to obtain a cigarette rod flow signal; Status judgment step: the PLC controller performs comprehensive judgment and analysis based on the cigarette rod flow rate signal, combined with the operation status signal of the carton filling and sealing machine and the status signal of the high-level cigarette rod storage device; Flow control steps: The PLC controller increases or decreases the priority of the high-level storage device according to the results of comprehensive judgment and analysis to control the high-level storage device to store or release cigarette rods.

8. The method for flexible tobacco transportation and early warning based on dynamic priority control according to claim 7 is characterized in that: Also includes: When the first photoelectric switch is continuously blocked for a period of time T1≥t1, it indicates that the flow rate of tobacco rods has increased; at the same time, the signal of the second photoelectric switch is collected. When the second photoelectric switch is continuously blocked for a period of time T2≥t2 and T1≥t1, it indicates that the flow rate of tobacco rods in the conveying channel is large and the tobacco rods have accumulated at the second photoelectric switch. At this time, the priority of the high-level storage device is increased, so that the high-level storage device stores tobacco rods, and the upper monitoring device performs interface display and sound and light warning; If T2≥t2 and T1≥t1 are not satisfied at the same time, it means that the flow of tobacco rods in the conveying channel is large, but has not accumulated to the second photoelectric switch. At this time, the priority of the high-level accumulator remains unchanged and the high-level accumulator does not operate; When the first photoelectric switch is continuously blocked for a period of time T1 < t1, it indicates that the flow of cigarette rods is normal. At this time, the priority of the high-position accumulator is reduced, and the high-position accumulator starts to release cigarette rods; Wherein, t1 and t2 are time thresholds of the first photoelectric switch and the second photoelectric switch being continuously blocked, respectively.

9. The method for flexible tobacco transportation and early warning based on dynamic priority control according to claim 8, characterized in that: The length, width and height of the cigarette rod are set to L, W and h respectively. The time for a single cigarette rod to pass through the optical fiber is W / V, where V is the belt running speed and is a constant value; then t1=5W / V, t2=3W / V.

10. The method for flexible tobacco transportation and early warning based on dynamic priority control according to claim 7, characterized in that: The state determination step also includes: When the running signal of the carton packing and sealing machine is collected, the judgment module of the PLC controller is entered, that is, the priority of the high-level accumulator is judged by using the cigarette flow information collected by the first photoelectric switch and the second photoelectric switch; If no operating signal of the carton filling and sealing machine is collected, the priority of the high-level cigarette storage device is directly increased so that the high-level cigarette storage device can store cigarette rods.

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