Double-end balanced feeding system for tobacco primary processing and control method

Abstract

The invention belongs to the technical field of tobacco primary processing production, and provides a tobacco primary processing double-end balance type feeding system and a control method.The tobacco primary processing double-end balance type feeding system comprises a material tank, a discharging valve connected with the material tank through a pipeline, a feeding pump connected with one end of the discharging valve through a pipeline, and a cleaning valve connected with the other end of the discharging valve through a pipeline; the charging roller is connected with the charging pump through a pipeline; the balance valve is additionally arranged in front of the discharging valve of the discharging pipeline of the charging machine, so that a double-end balance type charging system is established during production of the whole discharging system, the design defect of an original single-end balance type discharging system is overcome, the balance valve is additionally arranged, the balance valve can be opened in the pre-filling process of the production charging machine, and uncertain pressure in the pipeline before charging is discharged in real time; the influence caused by bubbles in feed liquid and leakage of cleaning water of the cleaning valve is avoided; and the balance valve is closed in the material liquid recovery and pipeline cleaning processes, so that the charging system is prevented from being interfered by external factors, and quality accidents in the charging process are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco shred production, and in particular relates to a double-end balanced feeding system and a control method for tobacco shred production. Background Art

[0002] In the tobacco silk production process, the application of flavors is an important link in the silk production. The uniform, continuous and precise application of liquid feed is an important factor in ensuring stable product quality. The structure of the feeding equipment is complex and there are many risk factors in the control of the liquid feed application process.

[0003] During the production feeding stage, the feeding flow rate of the feeder is calculated by the tobacco leaf flow rate and the feeding ratio. The feeding flow rate is measured by the feeding flow meter. The stability and accuracy of the flow meter play a key role in the feeding process. In the traditional feeding system, when there are bubbles in the liquid feed, the flow meter will measure inaccurately, and the displayed value will be normal, but the actual liquid feed will be less. At this time, the feeding system cannot collect the abnormal flow rate. The feeding problem is often discovered after the production is completed, which directly affects the quality of the product. Similarly, if the cleaning water of the cleaning valve leaks and water enters the liquid feed, although the feeding accuracy is displayed normal, the actual liquid feed is less, which will also directly affect the product quality. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a double-end balanced feeding system and control method for tobacco silk making, by adding a balancing valve in front of the discharge valve of the feeder discharge pipeline, a double-end balanced feeding system is established during the production of the entire discharge system, which solves the design defects of the original single-end balanced discharge system. The addition of the balancing valve can open the balancing valve during the pre-filling process of the production feeder, and the uncertain pressure in the pipeline before the feeding is discharged in real time, which solves the influence caused by bubbles in the feed liquid and the leakage of cleaning water of the cleaning valve.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present invention provides a double-end balanced feeding system for tobacco shreds, which adopts the following technical scheme:

[0006] A double-end balanced feeding system for tobacco shreds, comprising a feed tank, a discharge valve connected to the feed tank through a pipeline, a feeding pump connected to one end of the discharge valve through a pipeline, a cleaning valve connected to the other end of the discharge valve through a pipeline, and a feeding roller connected to the feeding pump through a pipeline;

[0007] A balancing valve is provided on the pipeline between the cleaning valve and the discharge valve, and the balancing valve is connected to a controller; the controller is configured to: during the pre-filling and feeding process, control the balancing valve to open, discharge the uncertain pressure in the pipeline before feeding, and realize double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline clearing and flattening process, control the balancing valve to close.

[0008] Furthermore, a purge valve is provided on the pipeline between the cleaning valve and the discharge valve, and the balancing valve is located between the purge valve and the discharge valve.

[0009] Furthermore, a pressure sensor is provided on the pipeline between the balancing valve and the discharge valve.

[0010] Furthermore, a flow meter is provided on the pipeline between the feeding pump and the feeding drum.

[0011] Furthermore, the feeding pump is connected to the feeding drum via a nozzle valve and a pipeline, one end of the nozzle valve is connected to the flow meter via a pipeline, and the other end is connected to a return valve via a pipeline.

[0012] Furthermore, the first end of the return valve is connected to the material tank through a pipeline, the second end is connected to a sewage pipe, and the third end is connected to the nozzle valve through a pipeline.

[0013] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a control method for a double-end balanced feeding system for tobacco shreds, which adopts the following technical scheme:

[0014] A control method for a double-end balanced feeding system for tobacco shreds is disclosed, which uses the double-end balanced feeding system for tobacco shreds as described in the first aspect, including: during the pre-filling and feeding process, controlling the balancing valve to open, discharge the uncertain pressure in the pipeline before feeding, and realize double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline clearing and blowing process, controlling the balancing valve to close.

[0015] Further, when the material liquid in the material tank is ready, the pipeline pre-filling process is started, the balancing valve and the discharge valve are opened, the feeding pump is started, and the material liquid flows back to the material tank through the discharge valve, the flow meter, the nozzle valve and the return valve, completing the pipeline pre-filling;

[0016] Open the balance valve, discharge valve and nozzle valve, start the feeding pump, and the feed liquid is sprayed into the feeding drum through the discharge valve, flow meter and nozzle valve; the feeding pump calculates the feeding flow rate according to the tobacco leaf flow rate and the feeding ratio.

[0017] Furthermore, after the feeding production is completed, the feed end of the balancing valve and the discharge valve is closed, and the purge valve is opened. Under the action of compressed air, the material liquid in the pipeline flows into the material tank through the discharge valve, flow meter, nozzle valve and return valve.

[0018] Furthermore, when the liquid is purged and blown, the purge valve is closed, the cleaning valve is opened, and the cleaning water enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve for discharge; the cleaning valve is closed, the purge valve is opened, and the water in the discharge pipeline enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve under the action of compressed air for discharge.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adds a balancing valve in front of the discharge valve of the feeder discharge pipeline, so that the entire discharge system establishes a double-end balanced feeding system during production, thereby solving the design defects of the original single-end balanced discharge system. The added balancing valve can be opened during the pre-filling process of the production feeder to discharge the uncertain pressure in the pipeline before feeding in real time, solving the influence caused by bubbles in the feed liquid and leakage of cleaning water of the cleaning valve; the balancing valve is closed during the feed liquid recovery and pipeline cleaning process, thereby avoiding interference with the feeding system caused by external factors and avoiding the occurrence of quality accidents during the feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0022] Figure 1 This is a schematic structural diagram of a feeding system without a balancing valve according to Example 1 of the present invention;

[0023] Figure 2 This is a schematic structural diagram of a feeding system with a balancing valve according to Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0026] Embodiment 1:

[0027] As described in the background art, Figure 1 As shown, when the system is running, when there are bubbles in the feed liquid, the flow meter will measure inaccurately, the displayed value will be normal, but the actual feed liquid will be less. At this time, the feeding system cannot collect the abnormal flow rate, and the feeding problem is often discovered after the production is completed, which directly affects the quality of the product; similarly, if the cleaning water of the cleaning valve leaks and water enters the feed liquid, although the feeding accuracy is displayed normal, the actual feed liquid is less, which will also directly affect the product quality.

[0028] Specifically, when the feeding system is working, the B end of the liquid discharge valve is connected to the cleaning valve and the purge valve during the pre-filling stage and the feeding stage. The air pressure in the pipeline is affected by the status of the cleaning valve and the purge valve. When the two are closed normally, they are in a stable pressure state. When either of them leaks, the pipeline is in a boosting state, and the boosting speed is related to the degree of leakage. When the feeding system is working, the B end of the liquid return valve is connected to the sewage pipeline during the pre-filling stage, and the pipeline pressure is balanced with the atmospheric pressure; during the feeding stage, the B end of the nozzle valve is balanced with the air pressure in the tank through the AC end of the return valve. The increased pressure of the purge valve and the purge valve at the discharge end will enter the feeding system, affecting the feeding accuracy and directly causing quality accidents. In addition, water and air leakage are relatively concealed and not easy to be discovered. In addition, when feeding abnormalities occur, it is more difficult to troubleshoot the problem.

[0029] The material flow detection currently generally adopts the mass flow meter based on Coriolis force, which has stable operation and high metering accuracy. The disadvantage is that it has strict requirements on the measurement of feed liquid. The feed liquid cannot have two-phase flow, that is, the metering is inaccurate when the feed liquid has gas-liquid two phases. Of course, if the cleaning water of the cleaning valve leaks, it is obvious that replacing the feed liquid with water naturally does not meet the process requirements.

[0030] In order to solve at least one of the above problems, Figure 2 As shown, this embodiment provides a double-end balanced feeding system for tobacco shredding, and adding a balancing valve in the pipeline between the discharge valve and the purge valve can solve the problem of abnormalities in the feeding process caused by valve leakage; specifically, in the pre-filling and feeding process, the balancing valve is opened, the internal pressure of the pipeline connected to the B end of the discharge valve and the purge valve and the cleaning valve is balanced with the atmospheric pressure, the B end of the nozzle valve is the same as before, and the connecting pipelines are balanced with the atmospheric pressure, that is, a double-end balanced feeding system is generated; during the residual material recovery, pipeline cleaning, and pipeline purge, the balancing valve is closed, and each process is executed in the same way as the original system without change.

[0031] The feeding system in this embodiment includes a material tank, a discharge valve connected to the material tank through a pipeline, a feeding pump connected to one end of the discharge valve through a pipeline, a cleaning valve connected to the other end of the discharge valve through a pipeline, and a feeding drum connected to the feeding pump through a pipeline;

[0032] The material tank is provided with a gravity sensor; a purge valve is also provided on the pipeline between the cleaning valve and the discharge valve, and the balance valve is located between the purge valve and the discharge valve. A pressure sensor is provided on the pipeline between the balance valve and the discharge valve. A flow meter is provided on the pipeline between the feeding pump and the feeding roller. The feeding pump and the feeding roller are connected via a nozzle valve and a pipeline, one end of the nozzle valve is connected to the flow meter via a pipeline, and the other end is connected to a return valve via a pipeline. The first end of the return valve is connected to the material tank via a pipeline, the second end is connected to a sewage pipeline, and the third end is connected to the nozzle valve via a pipeline.

[0033] A balancing valve is arranged on the pipeline between the cleaning valve and the discharge valve, and the balancing valve, the cleaning valve, the purge valve, the discharge valve, the nozzle valve, the return valve, the pressure sensor, the weighing sensor and the flow meter are all connected to a controller; the controller is configured to: during the pre-filling and feeding process, control the balancing valve to open, discharge the uncertain pressure in the pipeline before feeding, and realize double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline purge and flattening process, control the balancing valve to close; and the controller is used to complete other control processes.

[0034] The application of flavors in tobacco silk production is achieved through a feeder. The feeder production process generally includes pre-filling, feeding, residual material recovery, pipeline cleaning and pipeline blowing and sewage discharge.

[0035] In this embodiment, based on the feeding system in this embodiment, optionally, the specific feeding process is as follows:

[0036] S1. Pre-filling process:

[0037] When the material tank is ready, the operator starts the pipeline pre-filling process before the production of the feeding system. The discharge valve and balance valve of the feeding tank are opened, the feeding pump is started, and the material liquid flows back to the tank through the loop composed of the discharge valve, flow meter, nozzle valve and return valve. The pipeline pre-filling process is completed. At this time, the B end of the discharge valve of the feeding system is connected to the purge valve and the cleaning valve. When the purge valve and the cleaning valve are closed, the B end of the return valve is connected to the sewage outlet and is in a state of normal air pressure balance.

[0038] S2, feeding process:

[0039] When the feeder is in production, the feeder enters the feeding process. At this time, the discharge valve, nozzle valve and balance valve are opened, the feed pump starts to run, and the feed liquid is sprayed into the drum through the discharge valve, flow meter and nozzle valve. The return valve is an angle pass, and the B end of the nozzle valve is balanced with the air pressure in the tank through the return valve (AC pass). The feed pump calculates the feed flow rate according to the tobacco flow rate and the feed ratio. The PLC program uses the PID regulation loop to achieve real-time tracking of the tobacco flow rate by the feed liquid flow rate. The B end of the feed system discharge valve is connected to the purge valve and the cleaning valve. When the purge valve and the cleaning valve are closed normally, the pipeline is in a closed and stable pressure state.

[0040] Specifically, a balancing valve is added in front of the discharge valve of the feeder discharge pipeline, so that a double-end balanced feeding system is established during the production of the entire discharge system, which solves the design defects of the original single-end balanced discharge system. The addition of the balancing valve can open the balancing valve during the pre-filling process of the production feeder, and discharge the uncertain pressure in the pipeline before feeding in real time, which solves the impact of bubbles in the feed liquid and leakage of cleaning water from the cleaning valve.

[0041] S3, Residue recovery process:

[0042] After the feeding production is finished, the operator starts the residual material recovery program, the balance valve and the discharge valve are closed, the purge valve is opened, and under the action of compressed air, the liquid in the pipeline flows into the material tank through the discharge valve, flow meter, nozzle valve, and return valve. This process is because the production has ended, and the air pressure balance problem at both ends is not considered.

[0043] S4, pipeline cleaning process:

[0044] When the liquid is purged and blown, the program automatically enters the discharge pipeline cleaning stage, the purge valve is closed, the cleaning valve is opened, and the cleaning water enters the sewage pipeline through the discharge valve, flow meter, nozzle valve, and return valve for sewage discharge. This process is because the production has ended, and the air pressure balance problem at both ends is not considered.

[0045] S5. Pipeline cleaning process:

[0046] When the discharge pipeline is cleaned, the program automatically enters the pipeline cleaning stage again, the cleaning valve is closed, the cleaning valve is opened, and the water in the discharge pipeline is discharged through the discharge valve, flow meter, nozzle valve, and return valve under the action of compressed air. At this point, the discharge process pipeline is empty and ready for the next batch of production. This process is because the production has ended, and the air pressure balance problem at both ends is not considered.

[0047] Specifically, the balancing valve is closed during the residual material recovery, pipeline cleaning and pipeline blowing processes to avoid interference with the feeding system due to external factors and to avoid quality accidents during the feeding process.

[0048] Embodiment 2:

[0049] The present embodiment provides a control method for a double-end balanced feeding system for tobacco shred production, using the double-end balanced feeding system for tobacco shred production as described in Example 1, including: during the pre-filling and feeding process, controlling the balancing valve to open, discharging the uncertain pressure in the pipeline before feeding, and realizing double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline clearing and blowing process, controlling the balancing valve to close.

[0050] Optionally, when the material liquid in the material tank is ready, start the pipeline pre-filling process, open the balancing valve and the discharge valve, start the feeding pump, and the material liquid flows back to the material tank through the discharge valve, flow meter, nozzle valve and return valve to complete the pipeline pre-filling; open the balancing valve, the discharge valve and the nozzle valve, start the feeding pump, and the material liquid is sprayed into the feeding drum through the discharge valve, flow meter and nozzle valve; the feeding pump calculates the feeding flow rate according to the tobacco leaf flow rate and the feeding ratio.

[0051] Optionally, after the feeding production is completed, close the feed end of the balancing valve and the discharge valve, open the purge valve, and under the action of compressed air, the material liquid in the pipeline flows into the material tank through the discharge valve, flow meter, nozzle valve and return valve.

[0052] Optionally, when the liquid is purged and blown, close the purge valve, open the cleaning valve, and the cleaning water enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve for discharge; close the cleaning valve, open the purge valve, and under the action of compressed air, the water in the discharge pipeline enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve for discharge.

[0053] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A double-end balanced feeding system for tobacco shreds, characterized in that: It includes a material tank, a discharge valve connected to the material tank through a pipeline, a feeding pump connected to one end of the discharge valve through a pipeline, a cleaning valve connected to the other end of the discharge valve through a pipeline, and a feeding roller connected to the feeding pump through a pipeline; A balancing valve is provided on the pipeline between the cleaning valve and the discharge valve, and the balancing valve is connected to a controller; the controller is configured to: during the pre-filling and feeding process, control the balancing valve to open, discharge the uncertain pressure in the pipeline before feeding, and realize double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline clearing and flattening process, control the balancing valve to close.

2. A double-end balanced feeding system for tobacco shreds as claimed in claim 1, characterized in that: A purge valve is also provided on the pipeline between the cleaning valve and the discharge valve, and the balancing valve is located between the purge valve and the discharge valve.

3. A double-end balanced feeding system for tobacco shred production as claimed in claim 1, characterized in that: A pressure sensor is arranged on the pipeline between the balancing valve and the discharge valve.

4. A double-end balanced feeding system for tobacco shreds as claimed in claim 1, characterized in that: A flow meter is arranged on the pipeline between the feeding pump and the feeding roller.

5. A double-end balanced feeding system for tobacco shreds as claimed in claim 4, characterized in that: The feeding pump is connected to the feeding drum via a nozzle valve and a pipeline. One end of the nozzle valve is connected to the flow meter via a pipeline, and the other end is connected to a return valve via a pipeline.

6. A double-end balanced feeding system for tobacco shreds as claimed in claim 5, characterized in that: The first end of the return valve is connected to the material tank through a pipeline, the second end is connected to a sewage discharge pipeline, and the third end is connected to the nozzle valve through a pipeline.

7. A control method for a double-end balanced feeding system for tobacco shred production, characterized in that: A double-end balanced feeding system for tobacco shred production as described in any one of claims 1 to 6 is used, comprising: during the pre-filling and feeding process, controlling the balance valve to open to discharge the uncertain pressure in the pipeline before feeding, thereby realizing double-end balanced feeding; during the residual material recovery, pipeline cleaning and pipeline clearing and blowing process, controlling the balance valve to close.

8. A control method for a double-end balanced feeding system for tobacco shred production as claimed in claim 7, characterized in that: When the material tank is ready, start the pipeline pre-filling process, open the balance valve and the discharge valve, start the feeding pump, and the material liquid flows back to the tank through the discharge valve, flow meter, nozzle valve and return valve to complete the pipeline pre-filling; Open the balance valve, discharge valve and nozzle valve, start the feeding pump, and the feed liquid is sprayed into the feeding drum through the discharge valve, flow meter and nozzle valve; the feeding pump calculates the feeding flow rate according to the tobacco leaf flow rate and the feeding ratio.

9. A control method for a double-end balanced feeding system for tobacco shredding as claimed in claim 7, characterized in that: After the feeding production is completed, close the feed end of the balancing valve and the discharge valve, open the purge valve, and under the action of compressed air, the material liquid in the pipeline flows into the material tank through the discharge valve, flow meter, nozzle valve and return valve.

10. A control method for a double-end balanced feeding system for tobacco shred production as claimed in claim 7, characterized in that: When the liquid is purged and blown, close the purge valve, open the cleaning valve, and the cleaning water enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve for discharge; close the cleaning valve, open the purge valve, and under the action of compressed air, the water in the discharge pipeline enters the sewage pipe through the discharge valve, flow meter, nozzle valve and return valve for discharge.

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