A method of monitoring a tobacco blending system

Abstract

The application provides a monitoring method of a tobacco blending system, comprising the following steps: acquiring the distances of a tobacco stream blending scale, a stem blending scale, a broken tobacco blending scale, a sheet tobacco blending scale, an expanded tobacco blending scale and a tobacco main scale; setting the flow of each blending scale according to the distances corresponding to the blending scales, a stack delay and a blending ratio, and making each blending scale blend the materials to be blended into the tobacco through a conveying belt according to the blending ratio and the set flow; acquiring the instantaneous flow of each blending scale and the running state of the belt at the inlet of the blending scale, and judging whether there is a device fault, a material blockage or a material shortage according to the instantaneous flow and the running state, and if so, alarming. The application can conveniently and accurately detect and judge the material blockage, the device fault or the material shortage position of the tobacco blending system, and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco blending, and in particular to a monitoring method for a tobacco blending system. Background Art

[0002] Tobacco processing lines are often equipped with three or more blending systems. These systems blend one or more types of tobacco—stem, expanded, flake, shred, and air-dried (produced in air-dried tobacco dryers)—into the tobacco produced by the tobacco leaf line in varying proportions, tailored to the specific brand and process requirements to meet diverse consumer needs. The blending system includes a main scale for leaf cuts, a scale for stem, expanded, flake, shred, and air-dried tobacco. During production, blockages or subtle equipment failures (such as belt slippage or a broken conveyor motor chain) in these scales can lead to serious quality issues with blending. This necessitates increased inspections by operators to identify problems. However, due to the large number of blending systems, even intensified inspections may not always identify problems promptly, and the workload on operators can be significant. Therefore, it is crucial to quickly and accurately detect blockages, equipment failures, or shredded tobacco in the tobacco blending system. Summary of the Invention

[0003] The present invention provides a monitoring method for a tobacco blending system, which solves the problem that the existing tobacco line blending system cannot timely determine the blending shortage caused by blockage, slippage or failure. It can quickly determine the material shortage in the blending system caused by blockage above the proportioning scale of the blending system, as well as the material shortage caused by blockage of the equipment before the proportioning scale, slippage of the conveyor belt and breakage of the motor chain of the conveyor equipment, and issue an alarm, so as to quickly deal with the problem, prevent the occurrence of quality accidents, and improve the product quality and work efficiency of tobacco production.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A monitoring method for a tobacco blending system, comprising:

[0006] Obtain the distance between the air-jet yarn proportioning scale, stem-jelly yarn proportioning scale, broken-jelly yarn proportioning scale, flake-jelly yarn proportioning scale, expanded-jelly yarn proportioning scale and the main leaf-jelly yarn proportioning scale;

[0007] According to the distance corresponding to each proportioning scale, the stack delay and the blending ratio, the flow rate of each proportioning scale is set, and each proportioning scale is made to blend the materials to be blended into the shredded leaves through the conveyor belt according to the blending ratio according to its own set flow rate;

[0008] Obtain the instantaneous flow of each proportioning scale and the running status of the belt in the proportioning scale entrance, and judge whether there is equipment failure, material blockage and material shortage based on the instantaneous flow and the running status. If so, an alarm is issued.

[0009] Preferably, judging whether there is equipment failure, material blockage, or material shortage based on the instantaneous flow rate and the operating status includes:

[0010] Determine whether each proportioning scale has instantaneous flow. If not, perform equipment fault diagnosis on the corresponding proportioning scale and report a proportioning scale fault alarm if a equipment fault occurs.

[0011] If yes, it is determined whether the corresponding proportioning scale entrance belt is in normal operation. If not, it is determined that there is a blockage above the proportioning scale when the entrance belt is in shutdown for more than a first time threshold.

[0012] Preferably, judging whether there is equipment failure, material blockage or material shortage according to the instantaneous flow rate and the operating status further includes:

[0013] When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is in normal operation, determine whether the no-flow state of the corresponding proportioning scale exceeds the second time threshold. If so, it is determined that there is a shortage of material in the upstream equipment of the corresponding proportioning scale.

[0014] Preferably, judging whether there is equipment failure, material blockage or material shortage according to the instantaneous flow rate and the operating status further includes:

[0015] When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is stopped, it is determined whether the corresponding proportioning scale inlet belt has not been running for more than a third time threshold. If so, it is determined that the metering tube of the corresponding proportioning scale is blocked.

[0016] Preferably, the step of obtaining the instantaneous flow of each proportioning scale and the running state of the belt in the proportioning scale inlet includes:

[0017] A speed sensor is set to perform speed detection on the belt at the proportioning scale entrance to obtain the belt running speed, and then the running state of the belt is determined according to the belt running speed.

[0018] Preferably, the step of obtaining the instantaneous flow of each proportioning scale and the running state of the belt in the proportioning scale inlet further includes:

[0019] The weight of the material on the belt is calculated based on the weight change of the material in the proportioning scale, and the corresponding instantaneous flow rate is then obtained based on the belt running speed and the material weight.

[0020] Preferably, it also includes:

[0021] The corresponding metering tubes of the proportioning scale are equipped with low material level photoelectric tubes, high material level photoelectric tubes and inlet anti-blocking photoelectric tubes from bottom to top;

[0022] When the low material level photoelectric tube, high material level photoelectric tube and entrance anti-blocking photoelectric tube all detect material accumulation, it is determined that the metering tube is blocked.

[0023] Preferably, it also includes:

[0024] When the belt corresponding to the entrance of the proportioning scale is in normal operation and the low material level photoelectric tube has not detected the material, it is determined that there is a shortage of material in the front equipment of the proportioning scale.

[0025] Preferably, it also includes:

[0026] The difference between the set flow rate corresponding to the proportioning scale and the instantaneous flow rate is compared with the set flow rate threshold. If the difference is continuously smaller than the set flow rate threshold within the set time, it is determined that there is a shortage of material in the upstream equipment of the proportioning scale.

[0027] Preferably, it also includes:

[0028] An audible and visual alarm is provided, and when it is determined that there is equipment failure, material blockage or material shortage, the audible and visual alarm is controlled to give an audible and visual alarm.

[0029] The present invention provides a monitoring method for a tobacco blending system, which judges equipment failure, material blockage and material shortage through the automatic signal of the blending line, the selection signal of the proportioning scale, the set flow value signal of the proportioning scale, the instantaneous flow signal of the proportioning scale, the operation signal of the proportioning scale and the operation signal of the proportioning scale feeding belt, thereby solving the problem that the existing tobacco line blending system cannot make timely judgments on blending shortage caused by material blockage, slippage or failure. It can quickly judge the material shortage position of the blending system caused by material blockage above the proportioning scale of the blending system, as well as the material shortage position caused by material blockage of the equipment in front of the proportioning scale, slippage of the conveying belt and breakage of the motor chain of the conveying equipment, and issue an alarm, so as to quickly deal with the problem and prevent the occurrence of quality accidents, thereby improving the product quality and work efficiency of tobacco production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments.

[0031] Figure 1 It is a schematic diagram of a monitoring method for a tobacco blending system provided by the present invention.

[0032] Figure 2 The present invention provides a monitoring logic flow diagram of a tobacco blending system.

[0033] Figure 3 It is a structural schematic diagram of the tobacco blending system provided by an embodiment of the present invention.

[0034] Figure 4 It is a structural schematic diagram of a proportioning scale provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and implementation methods.

[0036] In response to the problem that the current blending system cannot be quickly handled when a fault occurs and a large amount of manual inspection is required, the present invention provides a monitoring method for a tobacco blending system to solve the problem that the existing tobacco line blending system cannot promptly determine the blending shortage caused by blockage, slippage or failure. It can quickly determine the location of the shortage caused by blockage above the proportioning scale of the blending system, as well as the shortage caused by blockage of the equipment in front of the proportioning scale, slippage of the conveyor belt and breakage of the motor chain of the conveyor equipment, and issue an alarm, so as to quickly handle the problem, prevent the occurrence of quality accidents, and improve the product quality and work efficiency of tobacco production.

[0037] like Figure 1 and Figure 2 As shown, a monitoring method for a tobacco blending system includes:

[0038] S1: Obtain the distance between the air-flow yarn proportioning scale, stem yarn proportioning scale, broken yarn proportioning scale, flake yarn proportioning scale, expanded yarn proportioning scale and the main leaf yarn proportioning scale;

[0039] S2: setting the flow rate of each proportioning scale according to the distance corresponding to each proportioning scale, the stack delay and the blending ratio, and making each proportioning scale blend the materials to be blended into the shredded leaves through the conveyor belt according to the blending ratio according to its own set flow rate;

[0040] S3: Obtain the instantaneous flow of each proportioning scale and the running status of the belt in the proportioning scale entrance, and judge whether there is equipment failure, material blockage and material shortage based on the instantaneous flow and the running status. If so, an alarm is issued.

[0041] Specifically, if Figure 3As shown, under the production condition of the blending system, the main scale 11 of the leaf cut is running and there is an instantaneous flow of tobacco cut. This instantaneous flow is assigned in real time to the set flow of the air-cut tobacco proportioning scale 13, the stem-cut tobacco proportioning scale 14, the broken tobacco proportioning scale 17, the thin-cut tobacco proportioning scale 18, and the expanded tobacco proportioning scale 18 according to the different distances of each proportioning scale from the main scale 11. After different stack delays 12 and according to the different blending ratios of each proportioning scale, each proportioning scale then blends the materials to be blended (air-cut tobacco, stem-cut tobacco, broken tobacco, thin-cut tobacco, expanded tobacco) into the leaf cut in real time and accurately through the conveyor belt 15 according to its own set flow and the operation requirements of the control scale. Finally, the blending accuracy is calculated and the flavoring accuracy is controlled through the measurement of the electronic scale 16 before flavoring to produce qualified finished tobacco cut. Of course, not all brands of finished tobacco need to be mixed with all of the above materials. Some only need to be mixed with one or several of the above materials. This involves the selection of proportioning scales for different brands. Before production, it is necessary to select the proportioning scale and set the blending ratio of the scale.

[0042] In practical applications, by analyzing the working principle of the blending system, the logical relationship between the main scale for leaf yarn and each blending and proportioning scale is clarified, and based on the blockage and material shortage phenomenon, three types of blockage and material shortage conditions that need to be solved are identified. The first condition is the problem of blockage above the proportioning scale, the second condition is the problem of blockage and material shortage in the proportioning scale metering tube, and the third condition is the problem of material shortage in the proportioning scale front-end equipment. Then, according to the logical relationship of the blending system and the blockage and material shortage phenomenon, the essential factors for solving the problems in these three conditions are determined. The solution to the first condition is: the automatic signal of the blending line is connected in series with the proportioning scale selection signal, the proportioning scale set flow value signal, the proportioning scale instantaneous flow signal, the proportioning scale operation signal, and the proportioning scale feed belt non-operating signal, and then assigned to the delay connection timer. After a certain period of time, when the timer has an output, an audible and visual alarm and a text alarm of material blockage above the XX scale are issued. The solution to the second situation is to connect the automatic signal of the mixing line with the proportioning scale selection signal, the proportioning scale set flow value signal, the proportioning scale no instantaneous flow signal, the proportioning scale operation signal, and the proportioning scale feed belt non-operating signal in series, and then assign it to the delayed connection timer. After a certain period of time, when the timer has an output, an audible and visual alarm and a text alarm indicating that the XX scale metering tube is blocked and there is material shortage are issued. The solution to the third problem of material shortage in the proportioning scale front-end equipment is to connect the automatic signal of the mixing line with the proportioning scale selection signal, the proportioning scale set flow value signal, the proportioning scale no instantaneous flow signal, the proportioning scale operation signal, and the proportioning scale feed belt operating signal in series, and then assign it to the delayed connection timer. After a certain period of time, when the timer has an output, an audible and visual alarm and a text alarm indicating that the XX scale front-end equipment is short of material are issued.

[0043] like Figure 2 As shown, judging whether there is equipment failure, material blockage, or material shortage based on the instantaneous flow rate and the operating status includes:

[0044] Determine whether each proportioning scale has instantaneous flow. If not, perform equipment fault diagnosis on the corresponding proportioning scale and report a proportioning scale fault alarm if an equipment failure occurs.

[0045] If yes, it is determined whether the corresponding proportioning scale entrance belt is in normal operation. If not, it is determined that there is a blockage above the proportioning scale when the entrance belt is in shutdown for more than a first time threshold.

[0046] Furthermore, judging whether there is equipment failure, material blockage, or material shortage based on the instantaneous flow rate and the operating status further includes:

[0047] When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is in normal operation, determine whether the no-flow state of the corresponding proportioning scale exceeds the second time threshold. If so, it is determined that there is a shortage of material in the upstream equipment of the corresponding proportioning scale.

[0048] Furthermore, judging whether there is equipment failure, material blockage, or material shortage based on the instantaneous flow rate and the operating status further includes:

[0049] When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is stopped, it is determined whether the corresponding proportioning scale inlet belt has not been running for more than a third time threshold. If so, it is determined that the metering tube of the corresponding proportioning scale is blocked.

[0050] Furthermore, the instantaneous flow of each proportioning scale and the running state of the belt in the proportioning scale inlet are obtained, including:

[0051] A speed sensor is set to perform speed detection on the belt at the proportioning scale entrance to obtain the belt running speed, and then the running state of the belt is determined according to the belt running speed.

[0052] Furthermore, the method of obtaining the instantaneous flow of each proportioning scale and the running state of the belt in the proportioning scale inlet further includes:

[0053] The weight of the material on the belt is calculated based on the weight change of the material in the proportioning scale, and the corresponding instantaneous flow rate is then obtained based on the belt running speed and the material weight.

[0054] The method further includes:

[0055] The corresponding metering tubes of the proportioning scale are equipped with low material level photoelectric tubes, high material level photoelectric tubes and inlet anti-blocking photoelectric tubes from bottom to top;

[0056] When the low material level photoelectric tube, high material level photoelectric tube and entrance anti-blocking photoelectric tube all detect material accumulation, it is determined that the metering tube is blocked.

[0057] The method further includes:

[0058] When the belt corresponding to the entrance of the proportioning scale is in normal operation and the low material level photoelectric tube has not detected the material, it is determined that there is a shortage of material in the front equipment of the proportioning scale.

[0059] The method further includes:

[0060] The difference between the set flow rate corresponding to the proportioning scale and the instantaneous flow rate is compared with the set flow rate threshold. If the difference is continuously smaller than the set flow rate threshold within the set time, it is determined that there is a shortage of material in the upstream equipment of the proportioning scale.

[0061] In practical applications, according to the logical relationship of the mixing system and the phenomenon of material blockage and shortage, the essential factors to solve the problem are determined. According to the phenomenon of material blockage and shortage, there are three situations that need to be solved. The first situation is the problem of material blockage above the proportioning scale, the second situation is the problem of material blockage and shortage in the proportioning scale metering tube, and the third situation is the problem of material shortage in the proportioning scale front-end equipment. Determine the essential factors of the problem of material blockage above the proportioning scale in the first situation. Figure 4 As shown, the reasons for the blockage on the proportioning scale are as follows: the belt of proportioning scale 22 and the main drive slip, causing the belt to stop running; the belt itself is too smooth, causing the material to stop moving; the motor chain of proportioning scale 22 is broken, causing the belt to stop running; there are foreign objects in the outlet of proportioning scale 22, causing blockage, etc. The inevitable phenomena (essential factors) caused by the above reasons are: the proportioning scale 22 must have been selected; the main leaf scale 11 is in production and the proportioning scale must have a set flow value; the belt motor of the scale must have a running speed V; there are many materials on the belt (weight P ) does not move forward, so the proportioning scale must have an instantaneous flow rate Qn; the material on the scale belt does not move forward and causes the metering tube 27 to be filled with material, which will inevitably cause the high-level photoelectric tube 24 of the metering tube (the function is to stop the proportioning scale feeding belt 28 from running when the material blocks the through-type photoelectric tube) and the low-level photoelectric tube 23 (the function is to start the proportioning scale feeding belt 28 from running and conveying material to the proportioning scale when the through-type photoelectric tube is not blocked by the material) to be blocked by the material, which will inevitably cause the proportioning scale feeding belt 28 to stop running for a long time and thus not convey material to the proportioning scale. Although the proportioning scale outlet is equipped with a through-type photoelectric tube 21 for detecting and preventing blocking materials, the photoelectric tube is often blocked by dust, hanging wire, and the photoelectric tube is displaced by external forces, which often sends out false signals and causes false alarms. Therefore, it is often ignored or even removed or blocked.

[0062] Based on the fundamental phenomenon (essential factor) of the material blockage problem at the top of the mix scale, as identified in the first scenario above, we must first establish a set flow rate signal for the mix scale. This must be determined based on the material grades and material ratios. The set flow rate Qp must not fall below a certain value, Qp1. This signal is tentatively defined as M100.0. This Qp1 is issued to the program along with the work order for each batch grade. This prevents false alarms at the start of production and at the end of production. Next, we establish the instantaneous flow rate signal for the mix scale during normal production. Based on experience, the absolute value of the difference between the set flow rate Qp and the instantaneous flow rate Qn should not exceed a certain value (usually 30 kg / h) for an extended period of time. This signal is tentatively defined as M100.1. If it exceeds this value for an extended period, it is considered a material shortage. If it is below this value, it is considered a normal material flow. If the proportioning scale selection signal is temporarily defined as M100.2, the proportioning scale operation signal is temporarily defined as M100.3, and the proportioning scale feed belt 28 operation signal is temporarily defined as M100.4, then the first situation alarm program can be designed as follows: the automatic signal of the blending system production line is connected in series with the normally open signal of M100,0, the normally open signal of M100.1, the normally open signal of M100.2, the normally open signal of M100.3, and the normally closed signal of M100.4 (the inverted signal of M100.4) and then assigned to the delayed connection timer SD. After a certain period of time (the time is set to 2 minutes), when the timer has an output signal, an audible and visual alarm and a text alarm of material blockage above the XX scale are immediately issued.

[0063] The second situation is to determine the essential factors of the problem of material shortage in the metering pipe. Figure 2 As shown. The reasons for the blockage and shortage of material in the metering tube 27 of the proportioning scale include: excessive dirt in the metering tube 27 and the metering tube inlet hopper 26, which prevents material from falling smoothly, causing blockage; excessive incoming material causing blockage; and displacement of the low-level photoelectric tube 23 and the high-level photoelectric tube 24, causing shortage of material. The inevitable phenomena (essential factors) caused by the above reasons are: the proportioning scale 22 must have been selected; the main leaf scale 11 is in production and the proportioning scale must have a set flow value Qp; the scale belt motor has an operating speed V; but due to the blockage in the metering tube, the low-level photoelectric tube 23 or the high-level photoelectric tube 24 is blocked by material or due to the displacement of these two photoelectric tubes, the proportioning scale feed belt 28 will inevitably stop running for a long time and not transport material to the proportioning scale. As a result, there is no material on the proportioning scale belt, resulting in no instantaneous flow rate Qn. Although the metering tube entrance is blocked by a photoelectric tube 25, the photoelectric tube is often ignored or shielded because it is often blocked by dust, hanging wire, and the photoelectric tube is displaced due to external forces, which often sends out false signals and causes false alarms.

[0064] Referring to the first situation alarm program, the second situation alarm program can be designed as follows: the automatic signal of the blending system production line is connected in series with the normally open signal of M100,0, the normally closed signal of M100.1 (M100.1 inverted signal), the normally open signal of M100.2, the normally open signal of M100.3, and the normally closed signal of M100.4 (M100.4 inverted signal), and then assigned to the delayed connection timer SD. After a certain period of time (the time is set to 2 minutes), when the timer outputs a signal, an audible and visual alarm and a text alarm of XX weighing tube blockage are immediately issued.

[0065] Establishing the third situation ratio is the essential factor of the problem of material shortage in the front-end equipment. Figure 4 As shown, the reasons for the material shortage in the front-stage equipment of the proportioning scale include: cabinet bottom belt slippage, cabinet blockage, cabinet motor chain breakage, material blockage in the material conveying equipment 29 before the proportioning scale, belt slippage or chain breakage, and slippage of the proportioning scale infeed belt 28. The inevitable phenomena (essential factors) caused by the above reasons are: the proportioning scale 22 must have been selected; the proportioning scale must have a set flow value when the main leaf silk scale 11 is in production; the scale belt motor has an operating speed V; the lack of material on the proportioning scale belt will inevitably result in no instantaneous flow rate Qn on the proportioning scale; and because there is no material on the proportioning scale, the low-level photoelectric tube 23 and the high-level photoelectric tube of the metering tube are not blocked by material, which inevitably causes the proportioning scale infeed belt 28 to continue running but no material is delivered to the proportioning scale. Although some manufacturers have installed diffuse reflection material detection photoelectric tubes on the proportioning scale feeding belt 28, the photoelectric tubes are often blocked by dust and the photoelectric tubes are shifted due to external forces, which often send out false signals and cause false alarms, so they are often ignored.

[0066] Referring to the first and second situation alarm programs, the third situation alarm program can be designed as follows: the automatic signal of the blending system production line is connected in series with the M100,0 normally open signal, M100.1 normally closed signal (M100.1 inverted signal), M100.2 normally open signal, M100.3 normally open signal, and M100.4 normally open signal, and then assigned to the delayed connection timer SD. After a certain period of time (the time is set to 2 minutes), when the timer has an output signal, an audible and visual alarm and a text alarm of material shortage in the front-stage equipment of XX are immediately issued.

[0067] The method further comprises: setting an audible and visual alarm, and controlling the audible and visual alarm to give an audible and visual alarm when it is determined that there is equipment failure, material blockage or material shortage.

[0068] It can be seen that the present invention provides a monitoring method for a tobacco blending system, which judges equipment failure, blockage and material shortage through the automatic signal of the blending line, the proportioning scale selection signal, the proportioning scale set flow value signal, the proportioning scale instantaneous flow signal, the proportioning scale operation signal and the proportioning scale feed belt operation signal, thereby solving the problem that the existing tobacco line blending system cannot make timely judgments on blending shortage caused by blockage, slippage or failure. It can quickly determine the material shortage position caused by blockage above the proportioning scale of the blending system, as well as the material shortage position caused by blockage of the equipment in front of the proportioning scale, slippage of the conveying belt and breakage of the motor chain of the conveying equipment, and issue an alarm, so as to quickly deal with the problem and prevent the occurrence of quality accidents, thereby improving the product quality and work efficiency of tobacco production.

[0069] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A monitoring method for a tobacco blending system, characterized in that: include: Obtain the distance between the air-jet yarn proportioning scale, stem yarn proportioning scale, broken yarn proportioning scale, flake yarn proportioning scale, expanded yarn proportioning scale and the main leaf yarn proportioning scale; According to the distance corresponding to each proportioning scale, the stack delay and the blending ratio, the flow rate of each proportioning scale is set, and each proportioning scale is made to blend the materials to be blended into the shredded leaves through the conveyor belt according to the blending ratio according to its own set flow rate; Obtain the instantaneous flow rate of each proportioning scale and the operating status of the proportioning scale inlet belt, and determine whether there is equipment failure, material blockage or material shortage based on the instantaneous flow rate and the operating status. If so, issue an alarm; The determining whether there is equipment failure, material blockage, or material shortage based on the instantaneous flow rate and the operating status includes: Determine whether each proportioning scale has instantaneous flow. If not, perform equipment fault diagnosis on the corresponding proportioning scale and report a proportioning scale fault alarm when a equipment fault occurs. If yes, it is determined whether the operation state of the corresponding proportioning scale entrance belt is in normal operation; if not, it is determined that there is a material blockage above the proportioning scale when the entrance belt is in a shutdown state for more than a first time threshold; When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is in normal operation, it is determined whether the no-flow state of the corresponding proportioning scale exceeds the second time threshold. If so, it is determined that the upstream equipment of the corresponding proportioning scale is short of material; When the proportioning scale itself does not malfunction and the proportioning scale inlet belt is stopped, it is determined whether the corresponding proportioning scale inlet belt has not been running for more than a third time threshold. If so, it is determined that the metering tube of the corresponding proportioning scale is blocked.

2. The monitoring method of the tobacco blending system according to claim 1, characterized in that: The method of obtaining the instantaneous flow of each proportioning scale and the operating status of the proportioning scale inlet belt includes: A speed sensor is provided to detect the speed of the belt at the proportioning scale entrance to obtain the belt running speed, and then the running state of the belt is determined according to the belt running speed.

3. The monitoring method of the tobacco blending system according to claim 2, characterized in that: The step of obtaining the instantaneous flow of each proportioning scale and the operating status of the proportioning scale inlet belt further includes: The weight of the material on the belt is calculated based on the weight change of the material in the proportioning scale, and the corresponding instantaneous flow rate is then obtained based on the belt running speed and the material weight.

4. The monitoring method of the tobacco blending system according to claim 3, characterized in that: Also includes: The corresponding metering tubes of the proportioning scale are equipped with low material level photoelectric tubes, high material level photoelectric tubes and inlet anti-blocking photoelectric tubes from bottom to top; When the low material level photoelectric tube, high material level photoelectric tube and entrance anti-blocking photoelectric tube all detect material accumulation, it is determined that the metering tube is blocked.

5. The monitoring method of the tobacco blending system according to claim 4, characterized in that: Also includes: When the belt corresponding to the entrance of the proportioning scale is in normal operation and the low material level photoelectric tube has not detected the material, it is determined that there is a shortage of material in the front equipment of the proportioning scale.

6. The monitoring method of the tobacco blending system according to claim 5, characterized in that: Also includes: The difference between the set flow rate corresponding to the proportioning scale and the instantaneous flow rate is compared with the set flow rate threshold. If the difference is continuously smaller than the set flow rate threshold within the set time, it is determined that there is a shortage of material in the upstream equipment of the proportioning scale.

7. The monitoring method of the tobacco blending system according to claim 6, characterized in that: Also includes: An audible and visual alarm is provided, and when it is determined that there is equipment failure, material blockage or material shortage, the audible and visual alarm is controlled to give an audible and visual alarm.

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