Pneumatic conveying cleaning system and conveying cleaning method

Abstract

The invention provides a pneumatic conveying sweeping system and a conveying sweeping method. The system comprises a main conveying pipeline and an auxiliary conveying pipeline which are connected with an air source and connected in parallel. The main conveying pipeline is used for supplying air to convey materials, and the auxiliary conveying pipeline assists the main conveying pipeline in conveying the materials. And the two pipelines are respectively provided with a flow controller. And a first pressure sensor is arranged at the discharge end of the pressure feed tank. The gas saving unit is connected to the main conveying pipeline in parallel, the controller can adjust the gas amount proportion of the main conveying pipeline and the auxiliary conveying pipeline through the flow controller according to the comparison result of the pressure detected by the first pressure sensor and the set pressure, and when the conveying pipelines are cleaned, the gas saving unit is controlled to supply gas to the main conveying pipeline. The conveying effect is improved through cooperation of the main conveying pipeline and the auxiliary conveying pipeline, accurate control over the air quantity is improved through flow control over the main conveying pipeline and the auxiliary conveying pipeline, and the conveying effect is improved. In addition, through the cooperation of the gas saving unit, the energy consumption during sweeping is reduced.

Description

Technical Field

[0001] The present application relates to the field of logistics technology, and in particular to a pneumatic conveying and cleaning system and a conveying and cleaning method. Background Art

[0002] The pneumatic conveying system is a component of the auxiliary system on the internal mixer, which is used to convey powder materials (carbon black, white carbon black, etc.) with large consumption. The system can convey materials in small bags, space bags, and tank trucks to large storage bins or daily storage bins through compressed air. It is a system that uses airflow energy to convey granular, powdered and other materials along the airflow direction in a closed pipeline. It is widely used in rubber, chemical and other industries. Other non-pneumatic conveying methods require unpacking at a certain height in the internal mixing workshop. There are also problems with forklift and labor costs for the transportation of raw materials. The comprehensive cost is not lower than pneumatic conveying, and there are greater risks in environmental protection. The pneumatic conveying pipeline is closed, which prevents dust leakage during the conveying process, greatly reducing environmental pollution, material loss and the impact of dust on the health of operators; and pneumatic conveying can achieve centralized unpacking, which can further improve efficiency and reduce personnel input with the use of large storage bins.

[0003] The pneumatic conveying system mainly includes two processes: material conveying and pipeline cleaning. The conveying process mainly realizes the delivery of materials to the designated target warehouse. After the conveying is completed, some materials often remain in the pipeline. Especially when the conveying material is changed, the conveying pipe needs to be thoroughly cleaned. During the pneumatic cleaning process, due to the small amount of material, in order to keep the material in the conveying pipeline clean and prevent cross-contamination of materials, affect the quality of rubber mixing, achieve rapid cleaning, and improve the working capacity of the system, the end air velocity of the cleaning is generally controlled at 15~30m / s. It is necessary to use a large amount of air to clean the pipeline multiple times. Therefore, the amount of air required for cleaning is much larger than the amount of air required for material transportation, resulting in high energy consumption and cost waste. Summary of the invention

[0004] The invention object of the present application is to provide a pneumatic conveying and cleaning system and a conveying and cleaning method, so as to reduce the energy consumption of the pneumatic conveying and cleaning system.

[0005] In a first aspect, a pneumatic conveying and cleaning system is provided, the pneumatic conveying and cleaning system comprising: an air source, a pressure delivery tank and a delivery pipeline; wherein: The delivery pipeline includes a main delivery pipeline and an auxiliary delivery pipeline which are connected to the gas source and arranged in parallel; The main conveying pipeline is connected to the conveying pipe of the pressure tank and is used to convey materials; a first flow controller is provided on the main conveying pipeline, and also includes a throttling unit connected in parallel with the first flow controller and used to replenish air to the main conveying pipeline; the position where the conveying pipe of the pressure tank is connected to the main conveying pipeline is the first position; The secondary delivery pipeline is connected to the main delivery pipeline, and a second flow controller is arranged on the secondary delivery pipeline; wherein the position where the secondary delivery pipeline is connected to the delivery pipe of the pressure delivery tank is the second position; along the direction of gas flow in the main delivery pipeline, the second position is located downstream of the first position; the first pressure sensor is located between the first position and the second position; It also includes a controller, which is used to adjust the gas volume ratio of the main conveying pipeline and the auxiliary conveying pipeline through the first flow controller and the second flow controller according to the comparison result of the pressure detected by the first pressure sensor and the set pressure when conveying materials; and when cleaning the conveying pipeline, control the air-saving unit to replenish air to the main conveying pipeline.

[0006] In the above scheme, the conveying effect is improved by the cooperation of the main conveying pipeline and the auxiliary conveying pipeline, and the flow rate of the two is controlled to improve the precise control of the gas volume and improve the conveying effect. In addition, the energy consumption during cleaning is reduced by the cooperation of the air-saving unit.

[0007] In a specific possible implementation scheme, the air-saving unit includes: a vacuum generator, a first control valve connected to the air supply port of the vacuum generator, a second control valve connected to the nozzle of the vacuum generator, and a filter connected to the injection port of the vacuum generator; wherein the first control valve and the second control valve are connected to the main delivery pipeline.

[0008] In a specific implementation scheme, it further includes a third control valve disposed on the main delivery pipeline and used to control the on-off of the main delivery pipeline; It also includes a first air flow meter for detecting the gas flow provided by the gas source, and a second air flow meter for detecting the gas flow on the main delivery pipeline after the air-saving unit is replenished with air; The controller is also used to determine the air supply volume of the throttling unit based on the first air flow meter, the second air flow meter and the second flow controller; if the air supply volume of the throttling unit is greater than or equal to the set air volume, the third control valve is controlled to be closed; if the air supply volume of the throttling unit is less than the set air volume, the third control valve is controlled to be opened, and the difference between the set air volume and the air supply volume is adjusted through the first flow controller.

[0009] In a specific possible implementation scheme, it also includes a second pressure sensor arranged in the main delivery pipeline and used to detect the back pressure of the throttling unit; the controller is also used to control the third control valve to open, and control the first control valve and the second control valve to close when the back pressure of the throttling unit detected by the second pressure sensor is greater than the set back pressure.

[0010] In a specific implementation scheme, the controller is specifically used to: When the pressure detected by the first pressure sensor is less than a first set pressure value, the gas volume transported by the main transport pipeline is adjusted to 60% to 90% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 10% to 40% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the first set pressure value and less than the second set pressure value, the gas volume transported by the main transport pipeline is adjusted to 50% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 50% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the second set pressure value, the first flow controller adjusts the gas volume transported by the main delivery pipeline to 10%~40% of the total gas volume, and the second flow controller adjusts the gas volume transported by the auxiliary delivery pipeline to 60%~90% of the total gas volume.

[0011] In a specific implementation scheme, the main delivery pipeline includes a first delivery pipeline and a first branch delivery pipeline, a second branch delivery pipeline and a third branch delivery pipeline connected to the first delivery pipeline and arranged in parallel; The first conveying pipeline is connected to the pressure tank and is used to pressurize the pressure tank; the second conveying pipeline is connected to the pressure tank and is used to loosen the materials stored in the pressure tank; the third conveying pipeline is connected to the material delivery pipe of the pressure tank and is used to convey materials; The first flow control valve is disposed in the first delivery pipeline.

[0012] In a specific possible implementation scheme, the secondary delivery pipeline includes a second delivery pipeline, and a plurality of branch pipelines connected to the second delivery pipeline and arranged in parallel; wherein the plurality of branch pipelines are arranged at intervals along the length direction of the second delivery pipeline, and each branch pipeline is connected to the main delivery pipeline through a plurality of jet units; The second position is the position where the branch pipeline closest to the discharge end of the pressure feeding tank is connected to the feed pipe.

[0013] In a specific possible implementation manner, each jetting unit is connected to a corresponding branch pipeline via a third one-way valve.

[0014] In a specific implementation manner, it further includes a first pressure reducing valve disposed on the main delivery pipeline and a second pressure reducing valve disposed on the auxiliary delivery pipeline.

[0015] In a second aspect, a conveying and cleaning method is provided, the method comprising the following steps: Supplying air to the conveying pipe of the pressure tank through the main conveying pipeline to convey the material in the pressure tank; Assisting the main conveying pipeline to supply air to the material conveying pipe through the airflow in the auxiliary conveying pipeline; The pressure of the conveying pipe when conveying materials is detected by a first pressure sensor; wherein the first pressure sensor is located between the first position and the second position; the first position is the position where the conveying pipe of the pressure tank is connected to the main conveying pipeline; the second position is the position where the auxiliary conveying pipeline is connected to the conveying pipe of the pressure tank; According to the comparison result between the pressure detected by the first pressure sensor and the set pressure, the gas volume ratio of the main delivery pipeline and the auxiliary delivery pipeline is adjusted by the first flow controller and the second flow controller; After the material is transported, air is added to the main transport pipeline through the air-saving unit.

[0016] In the above scheme, the conveying effect is improved by the cooperation of the main conveying pipeline and the auxiliary conveying pipeline, and the flow rate of the two is controlled to improve the precise control of the gas volume and improve the conveying effect. In addition, the energy consumption during cleaning is reduced by the cooperation of the air-saving unit.

[0017] In a specific implementation scheme, the gas volume ratio of the main delivery pipeline and the auxiliary delivery pipeline is adjusted by the first flow controller and the second flow controller according to the comparison result between the pressure detected by the first pressure sensor and the set pressure; specifically: When the pressure detected by the first pressure sensor is less than a first set pressure value, the gas volume transported by the main transport pipeline is adjusted to 60% to 90% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 10% to 40% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the first set pressure value and less than the second set pressure value, the gas volume transported by the main transport pipeline is adjusted to 50% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 50% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the second set pressure value, the first flow controller adjusts the gas volume transported by the main delivery pipeline to 10%~40% of the total gas volume, and the second flow controller adjusts the gas volume transported by the auxiliary delivery pipeline to 60%~90% of the total gas volume.

[0018] In a specific implementation scheme, when cleaning the third delivery pipeline, supplying air to the first delivery pipeline through the air saving unit specifically includes: Determine the air supply volume of the throttling unit according to the first air flow meter, the second air flow meter and the second flow controller; If the air supply volume of the air-saving unit is greater than or equal to the set air volume, the first control valve is controlled to close the first flow controller; If the air supply volume of the air-saving unit is less than the set air volume, the third control valve is controlled to open, and the difference between the set air volume and the air supply volume is adjusted by the first flow controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments provided according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0020] Figure 1 A schematic diagram of the structure of a pneumatic conveying and cleaning system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a throttling unit provided in an embodiment of the present application; Figure 3 A flow chart of the conveying and cleaning method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] To facilitate understanding of the pneumatic conveying and cleaning system provided in the embodiment of the present application, its application scenario is first described. The pneumatic conveying and cleaning system provided in the embodiment of the present application is applied in the material transportation industry. When conveying materials, a pneumatic conveying and cleaning system can be used to conveniently convey granular or powdered materials. However, in the process of conveying materials, the control of the gas volume is relatively rough, resulting in serious waste of gas volume. To this end, the embodiment of the present application provides a pneumatic conveying and cleaning system to improve the energy consumption of the pneumatic conveying and cleaning system, which is described in detail below in conjunction with specific drawings and embodiments.

[0024] refer to Figure 1 , Figure 1 The schematic diagram of the structure of the pneumatic conveying and cleaning system provided in the embodiment of the present application is shown. The pneumatic conveying and cleaning system provided in the embodiment of the present application includes an air source 100, a pressure tank 400 and a conveying pipeline. Among them, the air source 100 is used to provide an airflow for conveying materials, the pressure tank 400 is used to carry the materials to be conveyed, and the conveying pipeline is used to convey the materials in the pressure tank 400 to the desired location through the airflow provided by the air source 100. For ease of understanding, the structure and function of the pneumatic conveying and cleaning system are described in detail below.

[0025] Continue to refer Figure 1 The air source 100 provided in the embodiment of the present application may be an air compressor, which provides compressed air for the pneumatic conveying and cleaning system and is the power source of the pneumatic conveying and cleaning system. Of course, in addition to the air compressor, other equipment that can provide compressed air can be selected as the air source 100 as needed, and no one example is given in the embodiment of the present application.

[0026] The pressure tank 400 is a device for carrying materials, and the whole is a tank body. The pressure tank 400 has a loading port and a conveying pipe 420. The materials can be put into the pressure tank 400 through the loading port, and during pneumatic conveying, the materials are conveyed through the conveying pipe 420. In an practicable solution, the discharge port is located at the top of the pressure tank 400, and the conveying pipe 420 is located at the bottom of the pressure tank 400 to facilitate the input and output of materials.

[0027] The conveying pipeline provided in the embodiment of the present application is the main functional component of the pneumatic conveying and cleaning system, which can convey the material in the pressure tank 400 to the desired position through the compressed air provided by the gas source 100. In the specific setting, the conveying pipeline includes a main conveying pipeline 200 and an auxiliary conveying pipeline 300, the main conveying pipeline 200 and the auxiliary conveying pipeline 300 are arranged in parallel, and the main conveying pipeline 200 and the auxiliary conveying pipeline 300 are connected to the gas source 100. That is, the compressed air conveyed by the gas source 100 is respectively conveyed to the main conveying pipeline 200 and the auxiliary conveying pipeline 300, and the material in the pressure tank 400 is conveyed to the desired position through the cooperation of the main conveying pipeline 200 and the auxiliary conveying pipeline 300. The auxiliary conveying pipeline 300 is used to cooperate with the main conveying pipeline 200 to improve the blockage of the material during transportation. In the specific setting, the auxiliary conveying pipeline 300 is connected to the main conveying pipeline 200. For the convenience of description, the position where the conveying pipe 420 of the pressure tank 400 is connected to the main conveying pipeline 200 and the position where the conveying pipe 420 of the pressure tank 400 is connected to the main conveying pipeline 200 are defined. Among them, the first position is the position where the conveying pipe 420 of the pressure tank 400 is connected to the main conveying pipeline 200, and the second position is the position where the auxiliary conveying pipeline 300 is connected to the conveying pipe 420 of the pressure tank 400.

[0028] When conveying materials, the discharge end of the pressure tank 400 is prone to blockage. In order to improve the blockage situation, the auxiliary conveying pipeline 300 is used to convey gas into the main conveying pipeline 200, thereby increasing the gas volume of the main conveying pipeline 200 and improving the blockage situation. Specifically, the auxiliary conveying pipeline 300 is arranged side by side with the main conveying pipeline 200, and a pipe connected to the main conveying pipeline 200 is arranged on the auxiliary conveying pipeline 300. In the event of material blockage, the auxiliary conveying pipeline 300 can be connected to the main conveying pipeline 200 downstream of the blockage position to fluidize the material through the flow of airflow, thereby clearing the blocked material and facilitating the transportation of the material.

[0029] It can be seen from the above description that when materials are transported, the amount of gas on the main conveying pipeline 200 and the auxiliary conveying pipeline 300 directly affects the transportation of materials. In order to facilitate the matching of material transportation, the pneumatic conveying and cleaning system provided in the embodiment of the present application is also provided with a flow controller to control the amount of gas delivered to the main conveying pipeline 200 and the auxiliary conveying pipeline 300 through the flow controller. For the convenience of description, the two flow controllers are named as the first flow controller 201 and the second flow controller 301. Among them, the first flow controller 201 is arranged on the main conveying pipeline 200, and the second flow controller 301 is arranged on the auxiliary conveying pipeline 300. The amount of gas delivered to the main conveying pipeline 200 is controlled by the first flow controller 201, and the amount of gas delivered to the auxiliary conveying pipeline 300 is controlled by the second flow controller 301.

[0030] In addition, in order to determine whether material blockage occurs during transportation, the pneumatic conveying and cleaning system provided in the embodiment of the present application also includes a pressure sensor for detecting pressure. For the convenience of description, the pressure sensor is named as the first pressure sensor 500. The first pressure sensor 500 is arranged in the main conveying pipeline 200, and the first pressure sensor 500 is arranged between the first position and the second position. That is, when the first pressure sensor 500 is arranged, the first pressure sensor 500 is located near the discharge position of the pressure tank 400. During material transportation, the output end of the pressure tank 400 needs to be connected to the feed pipe 420 by a curved pipe, so material blockage is very likely to occur at this position. By arranging the first pressure sensor 500 at this position, the blockage at this position can be detected.

[0031] When specifically controlling the gas volume distribution of the gas source 100, the controller is used for controlling. Specifically, the controller is used to adjust the gas volume ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 through the first flow controller 201 and the second flow controller 301 according to the comparison result between the pressure detected by the first pressure sensor 500 and the set pressure. During specific control, the controller determines the material conveying situation according to the comparison result between the pressure of the first pressure sensor 500 and the set pressure, and adjusts the first flow controller 201 and the second flow controller 301 according to the pressure detected by the first pressure sensor 500 to adjust the gas volume distribution in the main conveying pipeline 200 and the auxiliary conveying pipeline 300, so that the material can be smoothly conveyed to the desired position at different stages of material conveying and when blockage occurs.

[0032] After the material is transported, the transport pipeline needs to be cleaned. In order to reduce the amount of gas used during cleaning, a throttling unit 600 is also provided in the pneumatic transport cleaning system provided in the embodiment of the present application. The throttling unit 600 is arranged in parallel with the first flow controller 201 and is used to replenish gas to the main transport pipeline 200. When the main transport pipeline needs to be cleaned, the throttling unit 600 can be opened to replenish gas to the main transport pipeline 200 through the throttling unit 600, thereby reducing the amount of gas provided by the gas source 100 during cleaning.

[0033] It can be seen from the above description that the pneumatic conveying cleaning system provided in the embodiment of the present application realizes the material conveying in the pressure tank 400 through the main conveying pipeline 200, and assists the main conveying pipeline 200 in conveying the material through the auxiliary conveying pipeline 300. In addition, according to the comparison result between the pressure detected by the first pressure sensor 500 and the set pressure, the gas volume ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is adjusted by the first flow controller 201 and the second flow controller 301 to improve the precise control of the gas volume, improve the conveying effect, and reduce energy consumption. In addition, when it is necessary to clean the conveying pipeline, the gas is supplemented in the main conveying pipeline through the cooperation of the air-saving unit 600. At this time, the gas flow in the main conveying pipeline includes the gas volume provided by the gas source 100 and the gas volume provided by the air-saving unit 600, thereby reducing the gas volume provided by the gas source 100 consumed during cleaning and reducing the energy consumption during cleaning. The energy consumption refers to the consumption of the gas volume provided by the gas source 100 during cleaning.

[0034] For reference Figure 2 As shown, Figure 2 The schematic diagram of the structure of the air-saving unit is shown. The main structure of the air-saving unit 600 provided in the embodiment of the present application includes a vacuum generator 610 and a valve that cooperates with the vacuum generator 610. Exemplarily, the valve includes a first control valve 630 that can be connected to the air supply port of the vacuum generator 610, and a second control valve 640 that is connected to the nozzle of the vacuum generator 610, wherein the air supply port and the nozzle of the vacuum generator 610 are both connected to the main conveying pipeline 200, and the connection position is located on both sides of the first flow controller 201, so that the vacuum generator 610 is connected in parallel with the first flow controller 201. That is, when set, the first control valve 630 and the second control valve 640 are respectively connected to the main conveying pipeline 200.

[0035] In one example, the first control valve 630 and the second control valve 640 are angle seat valves. When the air throttling unit 600 is needed, the first control valve 630 and the second control valve 640 are opened. When the air throttling unit 600 is not needed, the first control valve 630 and the second control valve 640 are closed.

[0036] When the conveying pipeline is pneumatically cleaned, the air-saving unit 600 is opened, that is, the first control valve 630 and the second control valve 640 are opened, and the vacuum generator 610 starts to work. The airflow provided by the gas source 100 passes through the nozzle of the vacuum generator 610 to form a supersonic airflow. Under the action of the high-speed airflow, a local vacuum is generated around it. Driven by the pressure difference, the outside air is sucked into the vacuum generator 610 through the injection port of the vacuum generator 610, and then enters the main conveying pipeline 200 for cleaning. In an optional scheme, in order to prevent impurities from being sucked into it, a filter 620 is added at its injection port, and the outside air is first filtered by the filter 620 when entering the vacuum generator 610. Obviously, in the cleaning stage, the vacuum generator 610 introduces the outside air into the main conveying pipeline 200, reducing the amount of gas provided by the gas source 100 in the process, saving energy consumption and reducing costs.

[0037] Continue to refer Figure 1 and Figure 2 When the third control valve 203 is used to connect the first flow controller 201 and the nozzle of the vacuum generator 610 to the main delivery pipeline 200, the third control valve 203 is used to connect the first flow controller 201 and the nozzle of the vacuum generator 610 to the main delivery pipeline 200. When the third control valve 203 is closed, the gas provided by the gas source 100 flows through the gas throttling unit 600 and then enters the main delivery pipeline 200 through the nozzle. When the third control valve 203 is opened, the gas provided by the gas source 100 flows through the first flow controller 201 and the gas throttling unit 600 at the same time.

[0038] In addition, the pneumatic conveying cleaning system also includes a first air flow meter 130 and a second air flow meter 205. The first air flow meter 130 is used to detect the gas flow provided by the gas source 100, the second air flow meter 205 is used to detect the gas flow on the main conveying pipeline 200 after the air-replenishing unit 600, and the second flow controller 301 can detect the gas flow on the auxiliary conveying pipeline 300. When in use, the air replenishment amount of the air-replenishing unit 600 can be calculated according to the first air flow meter 130, the second air flow meter 205 and the second flow controller. For example, the gas flow detected by the first air flow meter 130 is Q1, the gas flow detected by the second air flow meter 205 is Q2, and the gas flow detected by the second flow controller 301 is Q3, then the air replenishment amount Q4 of the air-replenishing unit 600 is: Q4=Q2+Q3-Q1.

[0039] During use, the back pressure of the vacuum generator 610 changes due to the change of the material in the feed pipe 420, resulting in different amounts of atmospheric pressure gas ejected by the vacuum generator 610. In order to maintain a large and stable amount of gas during cleaning, a first air flow meter 130 and a second air flow meter 205 are installed before and after the air-saving unit 600, respectively. The amount of external air ejected by the air-saving unit 600 can be detected by the flow difference between the two air flow meters and the second flow controller 301. If the air volume for pneumatic cleaning is met, the air source 100 does not need to provide additional air volume. Otherwise, the air source 100 provides the difference in air volume, thereby reducing the consumption of compressed air while maintaining a stable air volume during pneumatic cleaning and ensuring thorough cleaning.

[0040] When implemented, the specific control is controlled by the controller. When the controller is in use, the air supply volume of the air throttling unit 600 is determined according to the first air flow meter 130, the second air flow meter 205 and the second flow controller; if the air supply volume of the air throttling unit 600 is greater than or equal to the set air volume, the third control valve 203 is controlled to be closed; if the air supply volume of the air throttling unit 600 is less than the set air volume, the third control valve 203 is controlled to be opened, and the difference between the set air volume and the air supply volume is adjusted by the first flow controller. Exemplarily, the set air volume is Q5, then when Q4≥Q5, the third control valve 203 is closed, and when Q4<Q5, the third control valve 203 is opened, and according to the difference between Q5 and Q4, the first flow controller 201 is controlled to adjust the air volume to make up the difference between the two, so as to ensure that there is enough air volume in the main delivery pipeline for cleaning.

[0041] In an practicable solution, the pneumatic conveying and cleaning system further includes a second pressure sensor 204, which is disposed on the main conveying pipeline 200 and is used to detect the back pressure of the air-throttling unit 600. The controller can control the opening and closing of the third control valve 203 according to the back pressure of the air-throttling unit 600 detected by the second pressure sensor 204. Exemplarily, when the back pressure of the air-throttling unit 600 detected by the second pressure sensor 204 is greater than the set back pressure, the third control valve 203 is controlled to open. This avoids the situation where the gas flows back due to excessive back pressure.

[0042] In an optional embodiment, the air source 100 provides compressed air for the conveying pipeline, which is the power source of pneumatic conveying. Specifically, the air source 100 can be an air compressor, which is connected to an air filter 120. When working, the compressed air generated by the air compressor enters the main conveying pipeline 200 and the auxiliary conveying pipeline 300 respectively; in order to prevent impurities from contaminating materials and electrical components, an air filter 120 is installed at the discharge end of the air compressor, and the main conveying pipeline 200 and the auxiliary conveying pipeline 300 are both connected to the air compressor through the air filter 120.

[0043] In order to detect the pressure of the compressed air source 100, an air source pressure sensor is also installed between the discharge end of the air compressor and the front ends of the main conveying pipeline 200 and the auxiliary conveying pipeline 300. For the convenience of description, it is named the third pressure sensor 110. When the pressure detected by the third pressure sensor 110 is less than the set value, the conveying program is not allowed to start, so as to avoid conveying difficulties or blockages, and extend the conveying time.

[0044] The compressed air source pressure is often above 0.6Mpa. In order to protect the pressure resistance of the delivery pipeline and the components in the pipeline, the higher air source pressure is usually adjusted to the specified output pressure. Therefore, a first pressure reducing valve 202 is provided on the main delivery pipeline 200, and a second pressure reducing valve 302 is provided on the auxiliary delivery pipeline 300. Specifically, the first pressure reducing valve 202 is provided on the first delivery pipeline 210.

[0045] The gas volume of the main conveying pipeline 200 is controlled by the first flow controller 201, which is connected to the discharge end of the first pressure reducing valve 202; the gas volume of the auxiliary conveying pipeline 300 is controlled by the second flow controller 301, which is connected to the discharge end of the second pressure reducing valve 302. The principle of the first flow controller 201 and the second flow controller 301 is to combine the flow characteristics of the valve, use the pressure sensors before and after the controller valve, and continuously measure the pressure drop. The measured pressure difference and valve flow characteristics are used to determine the parameters of the volume flow (process value) of the control valve, and compare the measured value with the preset value. After comparison, the value is evaluated in the PID controller (Proportion Integration Differentiation, proportional-integral-differential controller), and is set as a new set point to the positioner to automatically adjust the valve opening to ensure that the preset flow is met, so as to achieve the purpose of accurately controlling the flow. It avoids the problem of flow change caused by the change in the outlet pressure of the pressure reducing valve due to the pressure fluctuation of the gas source 100, resulting in unstable transportation operation, and achieves the purpose of monitoring and controlling the flow.

[0046] In an operative solution, the main conveying pipeline 200 includes a first conveying pipeline 210 and three branch conveying pipelines connected to the first conveying pipeline 210 and connected in parallel. For the convenience of description, the three branch conveying pipelines are named as the first branch conveying pipeline 220, the second branch conveying pipeline 230 and the third branch conveying pipeline 240. Among them, the first branch conveying pipeline 220 is connected to the pressure tank 400 and is used to pressurize the pressure tank 400, and the pressure refers to pressurizing the material in the pressure tank 400 so that the material can be discharged from the discharge end. The second branch conveying pipeline 230 is connected to the pressure tank 400 and is used to loosen the material stored in the pressure tank 400. The material in the fluidized pressure tank 400 refers to the material being loosened by airflow when the material is stored in the pressure tank 400, so that the material can flow out of the pressure tank 400 smoothly, avoiding the situation where the material is accumulated and compacted to block the discharge end. The third delivery pipeline 240 is connected to the material delivery pipe 420 of the pressure tank 400 and is used to transport materials. During the transportation process, the airflow provided by the third delivery pipeline 240 can be used to bring the materials out of the material delivery pipe 420 to achieve material transportation. At the same time, the first delivery pipeline 220 applies pressure to the pressure tank 400, which further pushes the materials from the pressure tank 400 into the third delivery pipeline 240. In addition, when transporting materials, the second delivery pipeline 230 blows loose the materials to avoid blocking the materials, thereby facilitating smooth material transportation.

[0047] When the first flow controller 201 is provided, the first flow controller 201 is provided on the first delivery pipeline 210 , and the second air flow meter 205 and the second pressure sensor 204 are also provided on the first delivery pipeline 210 .

[0048] In an practicable solution, the pressure tank 400 further includes a tank body 410, and a material delivery pipe 420 connected to the bottom of the tank body 410 through a butterfly valve 430. During transportation, the main delivery pipeline 200 provides air power for the tank body 410 of the pressure tank 400; for the sake of automation and safety, a top pressure sensor 411 is installed on the tank body 410 of the pressure tank 400 to detect the pressure in the tank body 410. When the pressure is higher than the design pressure, the safety valve 224 on the tank body 410 opens to release the pressure in the tank body 410 to below the design pressure.

[0049] In addition, the first branch conveying pipeline 220 is connected to the top of the tank body 410 so that gas can be input at the top of the tank body 410 to apply positive pressure in the tank body 410 of the pressure tank 400. The second branch conveying pipeline 230 is connected to the bottom of the tank body 410 so that when the material falls to the bottom of the tank body 410, the material can be blown away by the gas input in the second branch conveying pipeline 230. The third branch conveying pipeline 240 is connected to the material conveying pipe 420 so that during the conveying process, the material can be taken out of the material conveying pipe 420 by the airflow provided by the third branch conveying pipeline 240 to realize the conveying of the material.

[0050] The main delivery pipeline 200 provided in the embodiment of the present application is composed of three branch gas pipelines: a first delivery pipeline 220, a second delivery pipeline 230, and a third delivery pipeline 240. Compressed air is filled into the third delivery pipeline 240 and the pressure tank 400 at different delivery stages to ensure smooth delivery. Among them, a first gate valve 221, a first angle seat valve 222, a safety valve 224, and a first check valve 223 are arranged on the first delivery pipeline 220; a second gate valve 231 and a second angle seat valve 232 are arranged on the second delivery pipeline 230; a third gate valve 241 and a third angle seat valve 242, and a second check valve 243 are arranged on the third delivery pipeline 240. Specifically, the first branch delivery pipeline 220 includes a first gate valve 221 connected to the first flow controller 201, a first angle seat valve 222 connected in sequence to the first gate valve 221, a first check valve 223 connected in sequence to the first angle seat valve 222, and a safety valve 224; the second branch delivery pipeline 230 includes a second gate valve 231 connected to the first flow controller 201, a second angle seat valve 232 connected in sequence to the second gate valve 231; the third branch delivery pipeline 240 includes a third gate valve 241 connected to the first flow controller 201, a third angle seat valve 242 connected in sequence to the third gate valve 241, and a second check valve 243 connected in sequence to the third angle seat valve 242. The pipeline flow of the first branch delivery pipeline 220, the second branch delivery pipeline 230 and the third branch delivery pipeline 240 is adjusted by the automatic opening and closing of the first angle seat valve 222, the second angle seat valve 232 and the third angle seat valve 242 respectively; the gate valves on each gas line, the first angle seat valve 222, the second gate valve 231 and the third gate valve 241 are used to inspect the components and adjust the gas volume on each pipeline. The first check valve 223 and the second check valve 243 are used to unidirectionally conduct the first branch delivery pipeline 220 with the pressure tank 400 and the third branch delivery pipeline 240 respectively to prevent materials from entering the compressed air pipeline, reducing the quality of the compressed air and damaging the air control components.

[0051] In an practicable solution, the auxiliary delivery pipeline 300 includes a second delivery pipeline 330, and a plurality of branch pipelines 310 connected to and arranged in parallel with the second delivery pipeline 330; wherein the plurality of branch pipelines 310 are arranged at intervals along the length direction of the second delivery pipeline 330, and each branch pipeline 310 is connected to the delivery pipe 420 through a plurality of jet units 320. The second position is the position where the branch pipeline 310 closest to the discharge end of the pressure tank 400 is connected to the delivery pipe 420.

[0052] In the specific implementation, the pneumatic conveying pipeline is connected to a plurality of branch pipelines 310, and a fourth angle seat valve 311 is also provided on each branch pipeline 310 to control the flow of the branch pipeline 310 through the fourth angle seat valve 311. Specifically, the branch pipeline 310 is connected to the second flow controller 301 for adjusting the flow through the fourth angle seat valve 311. The flow of the branch pipeline 310 is adjusted by controlling the on-off of the fourth angle seat valve 311. The branch pipeline 310 is provided with a jet unit 320 for replenishing air to the third branch conveying pipeline 240. When working, the jet unit 320 of the branch pipeline 310 provides gas to the material in the conveying pipeline to ensure that the material enters the target warehouse. The structure of the jet unit is not specifically defined, and it can only be a nozzle or a one-way booster structure set on the pipeline.

[0053] In a specific implementation manner, each jetting unit 320 is connected to the corresponding branch pipeline 310 via a third one-way valve 321 to prevent the material from entering the auxiliary conveying pipeline 300 .

[0054] In specific control, the controller provided in the embodiment of the present application adopts the following control logic: When the pressure detected by the first pressure sensor 500 is less than the first set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 60% to 90% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 10% to 40% of the total gas volume through the second flow controller 301; When the pressure detected by the first pressure sensor 500 is greater than the first set pressure value and less than the second set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 50% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 50% of the total gas volume through the second flow controller 301; When the pressure detected by the first pressure sensor 500 is greater than the second set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 10%~40% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 60%~90% of the total gas volume through the second flow controller 301.

[0055] In a specific example, a first pressure sensor 500 is installed downstream of the discharge elbow of the pressure feeding tank 400, which is used to detect the pressure of the discharge port of the pressure feeding tank 400 and control the end of the conveying process. During the pneumatic conveying process, due to the influence of the change of the material in the conveying pipe 420, the pressure in the pipeline detected by the first pressure sensor 500 is changing, showing a trend of gradually increasing to a stable conveying state and then decreasing, that is, the conveying state is changing, so the gas volume distribution ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is adjusted according to the pressure change in the pipeline to ensure the stability of the conveying state. At the beginning of the conveying, the proportion of the distributed gas volume in the main conveying pipeline 200 is higher than 50%; after the conveying is stable, the proportion of the distributed gas volume in the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is 50% each; when the pressure in the third branch conveying pipeline 240 is higher than a certain value, it can be determined that the material is blocked in the pipeline, and the proportion of the distributed gas volume in the compressed air pipeline of the auxiliary conveying pipeline 300 is higher than 50%, and the blocked material is flushed away by pneumatic force to ensure the smooth operation of the conveying pipeline.

[0056] By combining the characteristics of the flow controller and the distribution and conveying process of the gas volume of the main conveying pipeline 200 and the auxiliary conveying pipeline 300, the conveying gas volume can be set separately for different materials and different conveying distances. The conveying gas volume of different materials can be accurately controlled while meeting the conveying capacity, so as to achieve the optimal conveying gas volume and further save the use of compressed air.

[0057] To facilitate understanding of the pneumatic conveying and cleaning system provided in the embodiment of the present application, the working process thereof is described in detail below: During operation, the air compressor starts, filters impurities through the air filter 120, and then adjusts the compressed air from the air source pressure to a certain value through the first pressure reducing valve 202 and the second pressure reducing valve 302, respectively, and fills the compressed air into the main conveying pipeline 200 and the auxiliary conveying pipeline 300 of the respective pipelines to provide power for material transportation.

[0058] The conveyed material is unpacked before entering the pressure tank 400. During unpacking, the pressure in the pressure tank 400 is detected by the top pressure sensor 411. When the pressure in the pressure tank 400 is greater than 0.03Mpa, no material is allowed to be added to the pressure tank 400. The butterfly valve 430 on the pressure tank 400 is opened to release the pressure. After the pressure release (less than 0.03MP) is completed, the passage for the powder to enter the pressure tank 400 from the unpacking unit is opened, the second angle seat valve 232 is opened, and unpacking begins (blow the material to loosen the material, the first branch conveying pipeline 220 and the third branch conveying pipeline 240 are closed, and the first flow controller 201 controls the gas volume to be low, about 200~300 cubic meters / hour). When the pressure feeding level meter on the pressure feeding tank 400 detects that the material fills the pressure feeding tank 400, the pressure feeding level meter sends a signal, closes the feed butterfly valve 412, the second angle seat valve 232, etc., and the unpacking is completed.

[0059] When the feed butterfly valve 412 is closed, a signal is sent to open the first angle seat valve 222 and the second angle seat valve 232, and the material and gas are mixed and pressurized in the tank body 410. When the pressure tank 400 is pressurized to the set value, the third angle seat valve 242 is opened, and after a delay of 2 seconds, the butterfly valve 430 of the pressure tank 400 is opened, and material transportation begins. Compressed air enters the conveying pipeline (the third branch conveying pipeline is located at the downstream part of the conveying pipeline) from the main conveying pipeline 200 and the auxiliary conveying pipeline 300, and the pressurized material is conveyed to the target warehouse through the conveying pipeline; Before transportation, first set the material's one-to-one transportation parameters according to the material type, transportation distance, etc., then adjust the gas distribution ratio of the main transportation pipeline 200 and the auxiliary transportation pipeline 300 according to the change in the outlet pressure of the pressure tank 400, and finally use the first flow controller 201 and the second flow controller 301 to achieve precise control of the gas volume of the main transportation pipeline 200 and the auxiliary transportation pipeline 300, so as to help the transportation state to run smoothly and save energy. During the transportation process, it is necessary to open the valve on the corresponding branch pipeline 310 to replenish air according to the change in the pressure of the transportation pipeline to prevent the problem of blocked pipelines. During transportation, when the top pressure sensor 411 detects that the pressure in the pressure tank 400 is greater than a certain set value, the top first angle seat valve 222 and the cone second angle seat valve 232 are closed to play a protective role; After the first pressure sensor 500 at the outlet of the pressure feeding tank 400 detects that the pressure in the pipeline is continuously less than 0.03Mpa for 15S, a signal is sent out, and the first angle seat valve 222, the second angle seat valve 232, the third angle seat valve 242 at the bottom, the fourth angle seat valve 311, and the butterfly valve 430 of the pressure feeding tank 400 are closed, and the transportation is completed. Then, the tank pressure detection step is entered, and the next round of unpacking and transportation is entered, and this operation is repeated.

[0060] After the transportation is completed, especially when the transportation material is changed, since there is often a part of the material remaining in the pipeline, the transportation pipe needs to be thoroughly cleaned and the pneumatic cleaning process is started. When cleaning the transportation pipeline, the process flow is similar to the above transportation process. First, the gas distribution of the main transportation pipeline 200 and the main and auxiliary transportation pipelines 300 is adjusted according to the pressure change in the pipeline. The gas distribution ratio is the same as the transportation process to ensure the stability of the transportation state, and the opening of the pipeline is controlled by various valves. However, during pneumatic cleaning, the pipeline of the air-saving unit 600 is in an open state, and its opening and closing are automatically controlled by the first control valve 630 and the second control valve 640. At the same time, the third control valve 203 is temporarily closed to prevent gas backflow. Whether the third control valve 203 is opened or closed is determined by the amount of external air introduced by the throttling unit 600, and the introduced air volume can be obtained through the feedback of the first air flow meter 130, the second air flow meter 205 and the second flow controller 301. If the introduced air volume meets the pneumatic sweeping air volume, the air compressor does not need to provide additional air volume. Otherwise, the third control valve 203 is opened, and the difference air volume is accurately controlled by the first flow controller 201, thereby avoiding the problem of unstable sweeping air volume caused by different introduced air volumes due to changes in back pressure.

[0061] Similar to the conveying process, when the first pressure sensor 500 at the outlet of the pressure tank detects that the pressure in the pipeline is continuously lower than the set pressure (such as 0.03Mpa 15S), a signal is sent, and the first angle seat valve 222, the second angle seat valve 232, the third angle seat valve 242, the fourth angle seat valve 311, and the butterfly valve 430 are closed, and the cleaning is completed. Then, the tank pressure detection step is entered, and the next round of unpacking and conveying is entered, and this operation is repeated.

[0062] refer to Figure 3 As shown, for ease of understanding, the present application embodiment also provides a delivery method, which adopts Figure 1 The pneumatic conveying cleaning system shown in the figure performs conveying cleaning, and the conveying method includes the following steps: Step 001: supplying air to the material delivery pipe of the pressure delivery tank through the main delivery pipeline to deliver the material in the pressure delivery tank; Specifically, the following steps are included: Step a: fluidizing the material in the pressure tank 400 through the second branch conveying pipeline 230 in the main conveying pipeline 200; For details, please refer to Figure 1 Related description in .

[0063] Step b: applying pressure to the pressure delivery tank 400 through the first branch delivery pipeline 220 in the main delivery pipeline 200; For details, please refer to Figure 1 Related description in .

[0064] Step c: supplying gas to the material delivery pipe 420 through the third branch delivery pipeline 240 in the main delivery pipeline 200; For details, please refer to Figure 1 Related description in .

[0065] Step 002: Assisting the third branch conveying pipeline 240 to convey materials through the airflow in the auxiliary conveying pipeline 300; For details, please refer to Figure 1 Related description in .

[0066] Step 003: Detecting the pressure of the material conveying pipe when conveying materials through the first pressure sensor; The first pressure sensor 500 is located between the first position and the second position; the first position is the position where the pressure tank 400 is connected to the main delivery pipeline 200; the second position is the position where the auxiliary delivery pipeline 300 is connected to the main delivery pipeline 200; For details, please refer to Figure 1 Related description in .

[0067] Step 004 : According to the comparison result between the pressure detected by the first pressure sensor 500 and the set pressure, the gas volume ratio of the main delivery pipeline 200 and the auxiliary delivery pipeline 300 is adjusted by the first flow controller 201 and the second flow controller 301 .

[0068] Specifically, when the pressure detected by the first pressure sensor 500 is less than the first set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 60% to 90% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 10% to 40% of the total gas volume through the second flow controller 301; When the pressure detected by the first pressure sensor 500 is greater than the first set pressure value and less than the second set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 50% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 50% of the total gas volume through the second flow controller 301; When the pressure detected by the first pressure sensor 500 is greater than the second set pressure value, the gas volume delivered by the main delivery pipeline 200 is adjusted to 10%~40% of the total gas volume through the first flow controller 201, and the gas volume delivered by the auxiliary delivery pipeline 300 is adjusted to 60%~90% of the total gas volume through the second flow controller 301.

[0069] Step 005: After the material is transported, air is added to the main transport pipeline through the air-saving unit 600.

[0070] Specifically, the air supply volume of the air throttling unit 600 is determined according to the first air flow meter 130, the second air flow meter 205 and the second flow controller; If the air supply volume of the air-saving unit 600 is greater than or equal to the set air volume, the first control valve 630 is controlled to close the first flow controller; If the air supply volume of the air-saving unit 600 is less than the set air volume, the first control valve 630 is controlled to open, and the difference between the set air volume and the air supply volume is adjusted by the first flow controller.

[0071] In the above scheme, the conveying effect is improved by the cooperation of the main conveying pipeline and the auxiliary conveying pipeline, and the flow rate of the two is controlled to improve the precise control of the gas volume and improve the conveying effect. In addition, the energy consumption during cleaning is reduced by the cooperation of the air saving unit 600.

[0072] In the technical solution disclosed in the present application, the main conveying pipeline 200 is used to fluidize, pressurize and convey the material in the pressure tank 400, and the auxiliary conveying pipeline 300 assists the main conveying pipeline 200 in conveying the material. In addition, according to the comparison result between the pressure detected by the first pressure sensor 500 and the set pressure, the gas volume ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is adjusted by the first flow controller 201 and the second flow controller 301 to improve the precise control of the gas volume and improve the conveying effect.

[0073] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0074] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pneumatic conveying and cleaning system, characterized in that: include: Gas source, pressure tank and delivery pipeline; among which, The delivery pipeline includes a main delivery pipeline and an auxiliary delivery pipeline which are connected to the gas source and arranged in parallel; The main conveying pipeline is connected to the conveying pipe of the pressure tank and is used to convey materials; a first flow controller is provided on the main conveying pipeline, and also includes a throttling unit connected in parallel with the first flow controller and used to replenish air to the main conveying pipeline; the position where the conveying pipe of the pressure tank is connected to the main conveying pipeline is the first position; The secondary delivery pipeline is connected to the main delivery pipeline, and a second flow controller is arranged on the secondary delivery pipeline; wherein the position where the secondary delivery pipeline is connected to the delivery pipe of the pressure delivery tank is the second position; along the direction of gas flow in the main delivery pipeline, the second position is located downstream of the first position; the first pressure sensor is located between the first position and the second position; It also includes a controller, which is used to adjust the gas volume ratio of the main conveying pipeline and the auxiliary conveying pipeline through the first flow controller and the second flow controller according to the comparison result of the pressure detected by the first pressure sensor and the set pressure when conveying materials; and when cleaning the conveying pipeline, control the air-saving unit to replenish air to the main conveying pipeline.

2. The pneumatic conveying cleaning system according to claim 1, characterized in that: The air-saving unit includes: a vacuum generator, a first control valve connected to the air supply port of the vacuum generator, a second control valve connected to the nozzle of the vacuum generator, and a filter connected to the injection port of the vacuum generator; wherein the first control valve and the second control valve are connected to the main delivery pipeline.

3. The pneumatic conveying cleaning system according to claim 1, characterized in that: It also includes a third control valve disposed on the main delivery pipeline and used to control the on-off of the main delivery pipeline; It also includes a first air flow meter for detecting the gas flow provided by the gas source, and a second air flow meter for detecting the gas flow on the main delivery pipeline after the air-saving unit is replenished with air; The controller is also used to determine the air supply volume of the throttling unit based on the first air flow meter, the second air flow meter and the second flow controller; if the air supply volume of the throttling unit is greater than or equal to the set air volume, the third control valve is controlled to be closed; if the air supply volume of the throttling unit is less than the set air volume, the third control valve is controlled to be opened, and the difference between the set air volume and the air supply volume is adjusted through the first flow controller.

4. The pneumatic conveying cleaning system according to claim 3, characterized in that: It also includes a second pressure sensor arranged in the main delivery pipeline and used to detect the back pressure of the throttling unit; the controller is also used to control the third control valve to open and control the first control valve and the second control valve to close when the back pressure of the throttling unit detected by the second pressure sensor is greater than the set back pressure.

5. The pneumatic conveying and cleaning system according to any one of claims 1 to 4, characterized in that: The controller is specifically used for: When the pressure detected by the first pressure sensor is less than a first set pressure value, the gas volume transported by the main transport pipeline is adjusted to 60% to 90% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 10% to 40% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the first set pressure value and less than the second set pressure value, the gas volume transported by the main transport pipeline is adjusted to 50% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 50% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the second set pressure value, the first flow controller adjusts the gas volume transported by the main delivery pipeline to 10%~40% of the total gas volume, and the second flow controller adjusts the gas volume transported by the auxiliary delivery pipeline to 60%~90% of the total gas volume.

6. The pneumatic conveying cleaning system according to claim 5, characterized in that: The main delivery pipeline includes a first delivery pipeline and a first branch delivery pipeline, a second branch delivery pipeline and a third branch delivery pipeline connected to the first delivery pipeline and arranged in parallel; The first conveying pipeline is connected to the pressure tank and is used to pressurize the pressure tank; the second conveying pipeline is connected to the pressure tank and is used to loosen the materials stored in the pressure tank; the third conveying pipeline is connected to the material delivery pipe of the pressure tank and is used to convey materials; The first flow control valve is disposed in the first delivery pipeline.

7. The pneumatic conveying cleaning system according to claim 5, characterized in that: The auxiliary conveying pipeline includes a second conveying pipeline, and a plurality of branch pipelines connected to the second conveying pipeline and arranged in parallel; wherein the plurality of branch pipelines are arranged at intervals along the length direction of the second conveying pipeline, and each branch pipeline is connected to the conveying pipe through a plurality of jet units; The second position is the position where the branch pipeline closest to the discharge end of the pressure feeding tank is connected to the feed pipe.

8. The pneumatic conveying cleaning system according to claim 7, characterized in that: Each jet unit is communicated with a corresponding branch pipeline through a third one-way valve.

9. The pneumatic conveying cleaning system according to claim 5, characterized in that: It also includes a first pressure reducing valve arranged on the main delivery pipeline, and a second pressure reducing valve arranged on the auxiliary delivery pipeline.

10. A conveying and cleaning method, characterized in that: The following steps are involved: Supplying air to the conveying pipe of the pressure tank through the main conveying pipeline to convey the material in the pressure tank; Assisting the main conveying pipeline to supply air to the material conveying pipe through the airflow in the auxiliary conveying pipeline; The pressure of the conveying pipe when conveying materials is detected by a first pressure sensor; wherein the first pressure sensor is located between the first position and the second position; the first position is the position where the conveying pipe of the pressure tank is connected to the main conveying pipeline; the second position is the position where the auxiliary conveying pipeline is connected to the conveying pipe of the pressure tank; According to the comparison result between the pressure detected by the first pressure sensor and the set pressure, the gas volume ratio of the main delivery pipeline and the auxiliary delivery pipeline is adjusted by the first flow controller and the second flow controller; After the material is transported, air is added to the main transport pipeline through the air-saving unit.

11. The conveying and cleaning method according to claim 10, characterized in that: According to the comparison result between the pressure detected by the first pressure sensor and the set pressure, the gas volume ratio of the main delivery pipeline and the auxiliary delivery pipeline is adjusted by the first flow controller and the second flow controller; specifically: When the pressure detected by the first pressure sensor is less than a first set pressure value, the gas volume transported by the main transport pipeline is adjusted to 60% to 90% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 10% to 40% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the first set pressure value and less than the second set pressure value, the gas volume transported by the main transport pipeline is adjusted to 50% of the total gas volume through the first flow controller, and the gas volume transported by the auxiliary transport pipeline is adjusted to 50% of the total gas volume through the second flow controller; When the pressure detected by the first pressure sensor is greater than the second set pressure value, the first flow controller adjusts the gas volume transported by the main delivery pipeline to 10%~40% of the total gas volume, and the second flow controller adjusts the gas volume transported by the auxiliary delivery pipeline to 60%~90% of the total gas volume.

12. The conveying and cleaning method according to claim 10, characterized in that: The step of replenishing air to the first delivery pipeline through the air-saving unit specifically includes: Determine the air supply volume of the throttling unit according to the first air flow meter, the second air flow meter and the second flow controller; If the air supply volume of the air-saving unit is greater than or equal to the set air volume, the first control valve is controlled to close the first flow controller; If the air supply volume of the air-saving unit is less than the set air volume, the third control valve is controlled to open, and the difference between the set air volume and the air supply volume is adjusted by the first flow controller.

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