A dynamic pressure-stable airflow system for cleaning of tobacco dust waste and application method thereof

Abstract

The application relates to the technical field of cigarette production, and particularly discloses a dynamic stable-pressure airflow system for cleaning of tobacco powder waste and an application method, which comprises a primary distribution box and a secondary gas storage tank; an air inlet pipe is arranged at the top of the primary distribution box; a spiral filter assembly is arranged in the primary distribution box; the spiral filter assembly comprises a spiral groove, and a filter screen is attached to the inner wall of the spiral groove; a solid waste dropping port is arranged below the filter screen; a solid waste collecting groove is arranged below the solid waste dropping port; a primary gas outlet and a stable-pressure gas taking pipe assembly are arranged in the side wall of the primary distribution box; the stable-pressure gas taking pipe assembly comprises a gas taking connecting pipe, a gas conveying pipe and an exhaust pipe; an electric control valve is arranged on the exhaust pipe; and a flow monitoring instrument is arranged on the gas conveying pipe. The application has the advantages of stable airflow supply, good energy-saving effect, high gas cleanliness and the like.

Description

Technical Field

[0001] This invention relates to the field of cigarette production technology, specifically to a dynamic pressure-stabilized airflow system and its application method for cleaning tobacco waste. Background Technology

[0002] During cigarette processing, tobacco leaves and dust fall off at various stages of the production line, such as during unpacking and weighing. Unpacking, in particular, is a critical step in the tobacco processing line. During unpacking, significant amounts of tobacco leaves and dust fall off from the bottom of the turning machine and shuttle car, as well as from the sides of the cardboard boxes after the robotic arm picks up plastic bags and places them inside. The current approach to address this is to install a dust removal device at each stage, and then connect all these devices to a single dust removal system. This system uses a positive pressure airflow on one side and negative pressure adsorption on the other. To save energy, the negative and positive pressure lines are not separate but connected by a circulating pipeline through a high-powered blower. The negative pressure line is connected to the blower's inlet, and the positive pressure line is connected to the blower's outlet. This significantly reduces energy consumption. However, the following drawbacks arise from using this circulating system: Firstly, in actual operation, the shutdown and use of the dust removal spray device in multiple sections are random. That is, the cleaning is only activated after a production operation in a section, and then shut down after cleaning, before the normal cigarette production operation in that section continues. However, if multiple sections of the dust removal spray device use a single circulating system, when the dust removal spray device in a certain section is shut down, because the airflow in each section is very large, the shutdown of a certain section can easily cause pulse-like airflow interference to the airflow in other sections, especially in nearby sections, which often generates strong airflow shock waves. Furthermore, the positive pressure airflow injection volume in each section needs to be fixed. If the airflow is too large, it will not only fail to clean the dust but will also cause tobacco and other dust to fly everywhere, seriously affecting the cleanliness of the air in the entire production workshop. Previous experiments using multiple sub-tanks connected to a main tank, and employing a pressure resistance sensor and an electrically controlled air valve in the inlet pipe for each sub-tank, yielded unsatisfactory results. This is because the required air pressure for cleaning tobacco and debris in various stages of the tobacco processing is not high, but the flow rate is large (due to the large cleaning area in each stage). The aforementioned method of multiple sub-tanks plus a main tank is prone to significant interference during the random opening and closing of each stage. This can lead to a sub-tank being affected by a shock wave and closing its electrically controlled air valve in the inlet pipe. At this time, the air flow rate required by that sub-tank is very large, which can easily result in low air pressure in the pipeline connected to that sub-tank, making it impossible to perform normal tobacco and debris cleaning operations. Secondly, because the gases in both negative pressure adsorption and positive pressure injection are circulated, the airflow from negative pressure adsorption carries a large amount of tobacco shreds and debris. Current circulation systems typically use a single blower, which, due to the required high airflow rate, cannot have a highly precise filter at the blower's inlet. Therefore, the positive pressure airflow carries some tobacco fragments, meaning the cleanliness of the gas in positive pressure injection is not high. Thus, ensuring stable airflow and pressure in each branch of the same debris injection system, as well as maintaining the cleanliness of the positive pressure airflow, is a key technical problem that remains to be solved. Summary of the Invention

[0003] This invention addresses the aforementioned technical problems by providing a dynamic pressure-stabilized airflow system and its application method for cleaning up smoke and dust waste, which offers excellent performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A dynamic pressure-stabilized airflow system for cleaning tobacco dust waste includes a primary distribution box and a secondary gas storage tank. The primary distribution box has an air inlet pipe at its top. A spiral filter assembly, comprising spiral grooves, is installed inside the primary distribution box. The spiral filter assembly includes spiral grooves, and a filter screen is attached to the inner wall of the spiral grooves. A solid waste drop outlet is located below the filter screen. A solid waste collection trough is located below the solid waste drop outlet. A primary air outlet and a pressure-stabilized air intake pipe assembly are located on the side wall of the primary distribution box. The pressure-stabilized air intake pipe assembly includes an intake connection pipe, a delivery pipe, and an exhaust pipe. The delivery pipe and the exhaust pipe are connected to the intake connection pipe via a tee. An electrically controlled valve is installed on the exhaust pipe. A flow monitor is installed on the delivery pipe. The flow monitor monitors the flow velocity on the delivery pipe and controls the electrically controlled valve to open or close when the airflow velocity is lower or higher than a set threshold.

[0006] Furthermore, the secondary air inlet of the secondary air storage tank is connected to the primary air outlet through a secondary pipeline; a differential pressure valve is provided on the secondary pipeline; and the pressure-stabilizing gas intake pipe assembly is connected to the secondary air storage tank.

[0007] Furthermore, there are two or more secondary gas storage tanks, each of which is connected to the primary gas outlet via a secondary pipeline, and each secondary pipeline is equipped with a differential pressure valve; each of the two or more secondary gas storage tanks is also connected to the pressure stabilizing gas intake pipe assembly; the two or more secondary gas storage tanks are interconnected with each other via a connecting pipe.

[0008] Furthermore, it also includes an N-stage gas storage tank, which is connected to the previous stage gas storage tank through an N-stage pipeline, and the N-stage pipeline is equipped with an Nth differential pressure valve; the N-stage gas storage tank is connected to the pressure-stabilizing gas intake pipe assembly.

[0009] Furthermore, it also includes a recovery gas tank, an air pump, and a high-pressure gas tank. The exhaust pipe of the pressure-stabilizing gas intake pipe assembly is connected to the recovery gas tank. The recovery gas tank is also equipped with a negative pressure vent valve. The air inlet of the air pump is connected to the recovery gas tank. The air outlet of the air pump is connected to the high-pressure gas tank. The recovery gas tank and the high-pressure gas tank are respectively equipped with an overpressure monitoring component and a pressure monitoring component. The overpressure monitoring component and the pressure monitoring component are used to control the start and stop of the air pump.

[0010] Furthermore, the central spiral groove of the spiral filter assembly is distributed directly below the air intake pipe; below the central spiral groove is a baffle structure.

[0011] Furthermore, the primary distribution box is equipped with a pressure relief valve.

[0012] The application method of the dynamic pressure-stabilized airflow system for cleaning dust waste as described above includes the following steps:

[0013] (1) Positive pressure gas is introduced into the primary distribution box through the air inlet pipe, and all the gas delivery pipes are closed;

[0014] (2) After the pressure relief valve releases the air, the air pump is started again and the air supply pipe is activated to perform positive pressure spray cleaning operation. At this time, the flow monitoring instrument on the corresponding air supply pipe detects the airflow and controls the electronically controlled valve to close.

[0015] (3) After one of the gas pipelines completes the positive pressure jet cleaning operation, the working valve of the gas pipeline is closed. When its flow monitor detects that the airflow is lower than the set threshold, the electric control valve on the pressure stabilizing gas intake pipe assembly at that location is opened to exhaust gas at that location and maintain the stability of gas entering and exiting the corresponding gas storage tank.

[0016] (4) Start the air pump through the overpressure monitoring component and the pressure monitoring component.

[0017] The beneficial effects of this invention compared to the prior art are as follows:

[0018] 1. By using a primary distribution box with a spiral filter assembly, positive pressure airflow is introduced from the middle and then swung outward along the spiral. Impurities in the centrifugally swung airflow are trapped by the filter screen attached to the inner wall of the spiral groove and then fall into the solid waste collection tank. This configuration achieves further efficient filtration of the airflow without creating resistance to the positive pressure airflow and reducing the input air pressure.

[0019] 2. By adopting a multi-stage gas storage tank approach, firstly, the required gas pressure range can be obtained according to the needs of each section. Secondly, interference in each stage of the gas storage tank can be significantly reduced. In particular, with the aforementioned pressure-stabilizing gas intake pipe assembly, after the gas intake and impurity removal operation, while closing the gas supply pipe, the electronically controlled valve can be activated to cause the exhaust pipe at that location to exhaust gas. By controlling the exhaust flow rate of the exhaust pipe to be the same as the flow rate of the gas supply pipe at that location during preparation, the relative stability of the gas pressure in each stage of the gas storage tank can be maintained. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the primary distribution box of the present invention;

[0021] Figure 2 This is a top view of the spiral filter assembly of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection and combination structure of the various components of the present invention. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0024] In the following embodiments, "left," "right," "front," "back," and "inner" are merely directions for the convenience of the descriptor and do not constitute a limitation on the structure of the present invention.

[0025] like Figures 1-3 As shown, a dynamic pressure-stabilized airflow system for cleaning tobacco dust waste includes a primary distribution box 1 and a secondary air storage tank; an air inlet pipe 7 is provided at the top of the primary distribution box 1; a spiral filter assembly is provided inside the primary distribution box 1, the spiral filter assembly includes a spiral groove, and a filter screen 9 is attached to the inner wall 10 of the spiral groove; a solid waste drop outlet is provided below the filter screen 9; a solid waste collection trough 4 is provided below the solid waste drop outlet; as shown... Figure 1 As shown, in this embodiment, the central spiral groove of the spiral filter assembly is distributed directly below the air inlet pipe 7; below the central spiral groove is a circular baffle structure 3, and the outer periphery of the circular baffle structure 3 is supported by a support arm. A perforation is provided below the outer periphery of the central spiral groove, i.e., in the support arm area, to facilitate the falling of waste residue. In this embodiment, the spiral filter assembly is clamped and fixed by clamping protrusions 8 and 2 at the upper and lower ends, respectively. The side wall of the primary distribution box 1 is provided with a primary air outlet 5 and a pressure-stabilizing air intake pipe assembly 18; the pressure-stabilizing air intake pipe assembly 18 includes an air intake connection pipe 13, an air supply pipe and an exhaust pipe; the air supply pipe and the exhaust pipe are connected to the air intake connection pipe through a tee; the air supply pipe is used to connect to the positive pressure air pipe of the slag spray suction device in a certain section, so as to spray the waste such as tobacco and broken leaves in that section with positive pressure, while the negative pressure pipeline will be continuously used for adsorption, and the airflow is circulated by the high-power blower or high-pressure blower used in the existing system; the air intake pipe 7 is connected to the air outlet of the high-power blower or high-pressure blower, and all the negative pressure pipes are connected to the air inlet of the high-power blower or high-pressure blower. The primary distribution box 1 is equipped with a pressure relief valve 6. The pressure relief valve 6 serves to regulate normal operation and provide safety protection. For example, when the system is first started, it is necessary to ensure that all the gas storage tanks in the system are full of gas in order to achieve stable gas pressure in the system during subsequent operations. The specific principle is as described in the application method. The system is then started for impurity removal after the pressure relief valve 6 releases gas. In the event of a malfunction, if the gas pressure in the primary distribution box 1 is too high, the pressure relief valve 6 will release gas.

[0026] The exhaust pipe is equipped with an electrically controlled valve 15; the gas delivery pipe is equipped with a flow monitor 16; the flow monitor monitors the flow velocity on the gas delivery pipe, and controls the electrically controlled valve 15 to open or close when the gas flow velocity is lower or higher than a set threshold. In use, after waste removal is completed on the gas delivery pipe of a certain pressure-stabilized gas intake pipe assembly 18, the valve at the working end is closed. The flow monitor 16 at that location detects a decrease in gas flow velocity, even to zero, and immediately controls the electrically controlled valve 15 on that pressure-stabilized gas intake pipe assembly 18. This allows the exhaust pipe to discharge an equal volume of gas (same gas throughput). The normal impurity removal gas flow rate of the gas delivery pipe and the exhaust flow rate of the exhaust pipe are adjusted during preparation. Regulation mainly involves adjusting the exhaust pipe's throughput, for example, by installing a valve on the exhaust pipe or by selecting the appropriate pipe diameter.

[0027] Furthermore, there are two or more secondary gas storage tanks. In this embodiment, there are two, including secondary gas storage tank 12 and secondary gas storage tank 19. The two secondary gas storage tanks are respectively connected to the primary gas outlet through secondary pipelines 5, and each secondary pipeline is equipped with a differential pressure valve 11. The two secondary gas storage tanks are also connected to the pressure stabilizing gas intake pipe assembly 18. The two or more secondary gas storage tanks are interconnected through connecting pipes 14. The purpose of having two secondary gas storage tanks is mainly to improve stability, because this embodiment also has a tertiary gas storage tank. At the same time, the differential pressure valves 11 are well-regulated, mainly to regulate the gas pressure of the secondary gas storage tanks to adapt to the gas pressure required for the corresponding section of impurity removal. At the same time, it can also improve the stability of the gas pressure of the primary distribution box 1 and the secondary gas storage tanks.

[0028] Furthermore, it also includes an N-stage gas storage tank. In this embodiment, a three-stage gas storage tank 21 is provided. The three-stage gas storage tank 21 is connected to the connecting pipe 14 between the two two-stage gas storage tanks via a three-stage pipeline, and a third differential pressure valve 17 is provided on the three-stage pipeline. The three-stage gas storage tank is connected to the pressure-stabilizing gas intake pipe assembly 18. The gas pressure of the three-stage gas storage tank 21 is lower than that of the two-stage gas storage tanks, which is to adapt to the gas pressure values ​​required for impurity removal in different work sections. In this way, different impurity removal gas pressure values ​​required in different work sections can be stably provided, and mutual interference and influence are extremely low. By providing the pressure-stabilizing gas intake pipe assembly 18, the mutual influence between work sections that take gas at the same pressure value is also extremely low.

[0029] Furthermore, to recover the positive pressure gas discharged from the exhaust pipe, the system also includes a recovery gas tank 26, an air pump 23, and a high-pressure gas tank 22. All exhaust pipes of the pressure-stabilizing gas intake assembly are connected to the recovery gas tank 26. The recovery gas tank 26 is also equipped with a negative pressure vent valve 25. The air inlet of the air pump is connected to the recovery gas tank. The air outlet of the air pump is connected to the high-pressure gas tank. The recovery gas tank and the high-pressure gas tank are respectively equipped with an overpressure monitoring component and a pressure monitoring component. The overpressure monitoring component and the pressure monitoring component are used to control the start and stop of the air pump. During use, it is crucial to monitor the pressure in the recovered gas tank 26 to prevent it from becoming too high (maintaining it near normal atmospheric pressure). Excessive pressure directly affects the normal exhaust flow of each exhaust pipe (affecting the exhaust volume). Therefore, an overpressure monitoring component is installed to monitor the pressure within the recovered gas tank 26 in real time. Once a set threshold is reached, the air pump 23 is activated to extract gas. The air pump 23 uses positive pressure at its inlet, which reduces energy consumption while obtaining high-pressure gas. The high-pressure gas is stored in the high-pressure gas tank 22, which is then transported through pipeline 20 to sections of the production workshop that require high-pressure gas, such as pulse high-pressure gas spray for unblocking and other sections that routinely use high-pressure gas. This significantly reduces energy consumption and production costs. The pressure monitoring component in the high-pressure gas tank 22 is used to monitor the gas pressure of the high-pressure gas tank 22. For example, when the gas pressure in the high-pressure gas tank 22 is low, the air pump 23 will be activated to fill it with gas. However, since the high-pressure gas tank 22 draws gas from the recovery gas tank 26, the negative pressure vent valve 25 in the recovery gas tank 26 also plays a role in preventing the gas pressure in the recovery gas tank 26 from being too low. If negative pressure occurs in the recovery gas tank 26, the negative pressure vent valve 25 will be automatically opened to allow air to enter, thereby maintaining the gas pressure in the recovery gas tank 26 relatively stable within the atmospheric pressure range.

[0030] The application method of the dynamic pressure-stabilized airflow system for cleaning dust waste as described above includes the following steps:

[0031] (1) Positive pressure gas is introduced into the primary distribution box through the air inlet pipe, and all the gas supply pipes are closed, and gas is stored in the secondary gas storage tank, the tertiary gas storage tank and the recovery gas tank 26 (at this time, the air pump 23 is closed).

[0032] (2) After the pressure relief valve releases air (as a signal), the air pump 23 is restarted (a high-flow-rate air pump should be selected during assembly, and its flow rate should preferably be higher than the total exhaust flow rate of each exhaust pipe) and the air supply pipe is activated for positive pressure jet cleaning. At this time, the flow monitor on the corresponding air supply pipe detects the airflow and controls the electrically controlled valve on the pressure stabilizing air intake pipe assembly 18 at that location to close. That is, when the air supply pipe on the pressure stabilizing air intake pipe assembly 18 at a certain location is activated for cleaning, for example... If the flow rate of the gas supply pipe is 'a', then the electrically controlled valve 15 of the corresponding exhaust pipe is closed. Once the cleaning operation is completed, the gas supply pipe is closed, and the electrically controlled valve 15 is closed. The exhaust pipe then discharges gas with a flow rate approximately 'a'. This control method ensures that the flow rate on the pressure-stabilized gas intake pipe assembly 18 remains constant at 'a'. This effectively prevents the gas pressure of other gas supply pipes from being affected when the gas supply pipe is closed, maintains stable gas pressure in each section of the operation, and ensures the effectiveness of the impurity removal operation in each section.

[0033] (3) After one of the gas pipelines completes the positive pressure jet cleaning operation, the working valve of the gas pipeline is closed. When its flow monitor detects that the airflow is lower than the set threshold, the electric control valve on the pressure stabilizing gas intake pipe assembly at that location is opened to exhaust gas at that location and maintain the stability of gas entering and exiting the corresponding gas storage tank.

[0034] (4) The air pump is started by the overpressure monitoring component and the pressure monitoring component. A high-power air pump is used to quickly and stably maintain the air pressure in the recovered air tank 26 within the set value, ensuring normal exhaust of the exhaust pipe.

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A dynamic pressure-stabilized airflow system for cleaning tobacco dust waste, characterized in that: The system includes a primary distribution box and a secondary gas storage tank. The primary distribution box has an air inlet pipe at its top. Inside the primary distribution box is a spiral filter assembly, including spiral grooves with a filter screen attached to the inner wall of the grooves. Below the filter screen is a solid waste discharge port. Below the solid waste discharge port is a solid waste collection trough. The side wall of the primary distribution box has a primary air outlet and a pressure-stabilizing gas intake pipe assembly. The pressure-stabilizing gas intake pipe assembly includes an intake connection pipe, a delivery pipe, and an exhaust pipe. The delivery pipe and the exhaust pipe are connected to the intake connection pipe via a tee. An electrically controlled valve is installed on the exhaust pipe. A flow monitor is installed on the delivery pipe. The flow monitor monitors the flow velocity on the delivery pipe and controls the electrically controlled valve to open or close when the flow velocity is below or above a set threshold. The secondary gas storage tank's secondary air inlet is connected to the primary air outlet via a secondary pipeline. A differential pressure valve is installed on the secondary pipeline. The pressure-stabilizing gas intake pipe assembly is connected to the secondary gas storage tank.

2. The dynamic pressure-stabilized airflow system for cleaning tobacco dust waste according to claim 1, characterized in that: The secondary gas storage tank is provided in two or more parts, and each of the two or more secondary gas storage tanks is connected to the primary gas outlet through a secondary pipeline, and each of the secondary pipelines is provided with a differential pressure valve; each of the two or more secondary gas storage tanks is also connected to the pressure stabilizing gas intake pipe assembly; the two or more secondary gas storage tanks are interconnected with each other through a connecting pipe.

3. The dynamic pressure-stabilized airflow system for cleaning tobacco dust waste according to claim 1, characterized in that: It also includes an N-stage gas storage tank, which is connected to the previous stage gas storage tank through an N-stage pipeline, and the N-stage pipeline is equipped with an Nth differential pressure valve; the N-stage gas storage tank is connected to the pressure-stabilizing gas intake pipe assembly.

4. A dynamic pressure-stabilized airflow system for cleaning tobacco dust waste according to any one of claims 1 to 3, characterized in that: It also includes a recovery gas tank, an air pump, and a high-pressure gas tank. The exhaust pipe of the pressure-stabilizing gas intake pipe assembly is connected to the recovery gas tank. The recovery gas tank is also equipped with a negative pressure vent valve. The air inlet of the air pump is connected to the recovery gas tank. The air outlet of the air pump is connected to the high-pressure gas tank. The recovery gas tank and the high-pressure gas tank are respectively equipped with an overpressure monitoring component and a pressure monitoring component. The overpressure monitoring component and the pressure monitoring component are used to control the start and stop of the air pump.

5. A dynamic pressure-stabilized airflow system for cleaning tobacco dust waste according to claim 1, characterized in that: The central spiral groove of the spiral filter assembly is located directly below the air intake pipe; below the central spiral groove is a baffle structure.

6. A dynamic pressure-stabilized airflow system for cleaning tobacco dust waste according to claim 4, characterized in that: The primary distribution box is equipped with a pressure relief valve.

7. An application method using the dynamic pressure-stabilized airflow system for cleaning tobacco waste as described in claim 6, characterized in that, Includes the following steps: (1) Positive pressure gas is introduced into the primary distribution box through the air inlet pipe, and all the gas supply pipes are closed; (2) After the pressure relief valve releases the air, the air pump is started again and the air supply pipe is activated to perform positive pressure spray cleaning operation. At this time, the flow monitoring instrument on the corresponding air supply pipe detects the airflow and controls the electronically controlled valve to close. (3) After one of the gas pipelines completes the positive pressure jet cleaning operation, the working valve of the gas pipeline is closed. When its flow monitor detects that the airflow is lower than the set threshold, the electric control valve on the pressure stabilizing gas intake pipe assembly at that location is opened to exhaust gas at that location and maintain the stability of gas entering and exiting the corresponding gas storage tank. (4) Start the air pump through the overpressure monitoring component and the pressure monitoring component.

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