Pneumatic conveying system and conveying method

Abstract

The invention provides a pneumatic conveying system and method. The pneumatic conveying system comprises an air source, a pressure conveying tank, a main conveying pipeline and an auxiliary conveying pipeline, wherein the main conveying pipeline and the auxiliary conveying pipeline are connected with the air source and connected in parallel. The main conveying pipeline can be used for fluidizing, pressing and conveying materials in the pressure conveying tank; the auxiliary conveying pipeline can assist the main conveying pipeline in conveying materials. Flow controllers are arranged on the main conveying pipeline and the auxiliary conveying pipeline respectively so as to adjust the air quantity of the main conveying pipeline and the air quantity of the auxiliary conveying pipeline. The first pressure sensor is arranged at the discharging end of the pressure feeding tank so as to detect the conveying state of materials, and the controller can adjust the air quantity 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. According to the scheme, 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.

Description

Technical Field

[0001] This application relates to the field of logistics technology, and particularly to a pneumatic conveying system and a conveying method. Background Art

[0002] The pneumatic conveying system is a component of the upper auxiliary machine system of the internal mixer and is used to convey a large amount of powder materials (such as carbon black, silica, etc.). This system can convey the materials in small bags, space bags, and tank trucks to a large storage bin or a daily storage bin through compressed air. It is a system that uses the energy of air flow to convey granular, powdery and other materials along the air flow direction in a closed pipeline and is widely used in industries such as rubber and chemical industry. Other non-pneumatic conveying methods require unpacking at a certain height in the internal mixing workshop, and there are also problems with the costs of forklifts and labor for raw material transportation. The comprehensive cost is not lower than that of pneumatic conveying, and there are greater potential hazards in terms of environmental protection. The pneumatic conveying pipeline is closed, which makes it impossible to generate 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, and the use of a large storage bin further improves efficiency and reduces the input of personnel.

[0003] Currently, the commonly used pneumatic conveying form is periodic dense-phase conveying (pressure tank). During a single conveying operation, it is an endless cycle process of "feeding → inflating and holding pressure → opening the valve for conveying → judging the end by pressure → feeding again". Although the conveying air volume can be adjusted by automatically or manually setting different conveying pressures according to different materials, the setting of the pressure is not accurately measured and often depends on the experience of the debugging personnel. In order to ensure the conveying efficiency, this pressure value is generally set relatively large, that is, the air volume during the conveying process cannot be accurately controlled according to the material conveying state, and it will cause a large consumption of compressed air and high energy consumption. Summary of the Invention

[0004] The invention objective of this application is to provide a pneumatic conveying system and a conveying method to reduce the energy consumption of the pneumatic conveying system.

[0005] In the first aspect, a pneumatic conveying system is provided. The pneumatic conveying system includes: an air source, a pressure tank, a main conveying pipeline and a secondary conveying pipeline that are connected to the air source and are in parallel; wherein, The main conveying pipeline includes a first conveying pipeline, a first branch conveying pipeline, a second branch conveying pipeline and a third branch conveying pipeline that are connected to the first conveying pipeline and are in parallel; wherein, the first branch conveying pipeline is communicated with the pressure tank and is used to apply pressure to the pressure tank; the second branch conveying pipeline is communicated with the pressure tank and is used to loosen the materials stored in the pressure tank; the third branch conveying pipeline is communicated with the material conveying pipe of the pressure tank and is used to convey materials; The auxiliary conveying pipeline is communicated with the material conveying pipe; wherein, the position where the third branch conveying pipeline is communicated with the material conveying pipe is the first position, and the position where the auxiliary conveying pipeline is communicated with the material conveying pipe is the second position; along the direction of the gas flow in the material conveying pipe, the second position is located downstream of the first position. It further includes a first flow controller arranged on the first conveying pipeline and a second flow controller arranged on the auxiliary conveying pipeline; and a first pressure sensor arranged on the material conveying pipe; the first pressure sensor is located between the first position and the second position. It further includes a controller, and the controller 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 between the pressure detected by the first pressure sensor and the set pressure.

[0006] In the technical solution disclosed in the present application, the material in the pressure feeding tank is fluidized, pressurized and conveyed through the main conveying pipeline, and the auxiliary conveying pipeline assists the main conveying pipeline to convey the material. In addition, 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 conveying pipeline and the auxiliary conveying pipeline is adjusted through the first flow controller and the second flow controller, so as to improve the precise control of the gas volume and reduce the energy consumption.

[0007] In a specific feasible implementation scheme, the controller is specifically used for: When the pressure detected by the first pressure sensor is less than the first set pressure value, the gas volume conveyed by the main conveying pipeline is adjusted to 60% - 90% of the total gas volume through the first flow controller, and the gas volume conveyed by the auxiliary conveying pipeline is adjusted to 10% - 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 conveyed by the main conveying pipeline is adjusted to 50% of the total gas volume through the first flow controller, and the gas volume conveyed by the auxiliary conveying 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 gas volume conveyed by the main conveying pipeline is adjusted to 10% - 40% of the total gas volume through the first flow controller, and the gas volume conveyed by the auxiliary conveying pipeline is adjusted to 60% - 90% of the total gas volume through the second flow controller.

[0008] In a specific feasible implementation scheme, the pressure feeding tank further includes a tank body, and the material conveying pipe is connected to the bottom of the tank body through a butterfly valve; The first branch conveying pipeline is communicated with the top of the tank body; The second delivery pipeline communicates with the bottom of the tank body; The third delivery pipeline communicates with the material delivery pipe.

[0009] In a specific feasible embodiment, it further includes a first gate valve, a first angle seat valve, a safety valve, and a first one-way valve provided on the first delivery pipeline; A second gate valve and a second angle seat valve provided on the second delivery pipeline; A third gate valve and a third angle seat valve provided on the third delivery pipeline, and a second one-way valve.

[0010] In a specific feasible embodiment, the auxiliary delivery pipeline includes a second delivery pipeline and a plurality of branch pipelines connected to and arranged in parallel with the second delivery pipeline; wherein, the plurality of branch pipelines are arranged at intervals along the length direction of the second delivery pipeline, and each branch pipeline communicates with the material delivery 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 material delivery pipe.

[0011] In a specific feasible embodiment, each jet unit communicates with the corresponding branch pipeline through a third one-way valve.

[0012] In a specific feasible embodiment, it further includes a fourth angle seat valve provided on each branch pipeline.

[0013] In a specific feasible embodiment, it further includes a first pressure reducing valve provided on the first delivery pipeline and a second pressure reducing valve provided on the auxiliary delivery pipeline.

[0014] In a specific feasible embodiment, the air source includes an air compressor and an air filter connected to the air compressor.

[0015] In a second aspect, a delivery method is further provided, and the method includes the following steps: Fluidize the material in the pressure feeding tank through the second delivery pipeline in the main delivery pipeline; Fluidize the material in the pressure feeding tank through the second delivery pipeline in the main delivery pipeline; Apply pressure to the pressure feeding tank through the first delivery pipeline in the main delivery pipeline; Supply air to the material delivery pipe of the pressure feeding tank through the third delivery pipeline in the main delivery pipeline to convey the material in the pressure feeding tank; Assist the third delivery pipeline to convey the material through the airflow in the auxiliary delivery pipeline; The pressure is detected by a first pressure sensor disposed in the material conveying pipe; wherein, the first pressure sensor is located between the first position and the second position; the first position is the position where the pressure feeding tank communicates with the material conveying pipe; the second position is the position where the auxiliary conveying pipeline communicates with the material conveying pipe. 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 conveying pipeline and the auxiliary conveying pipeline is adjusted by the first flow controller and the second flow controller.

[0016] In the technical solution disclosed in the present application, the material in the pressure feeding tank is fluidized, pressurized and conveyed through the main conveying pipeline, and the auxiliary conveying pipeline assists the main conveying pipeline to convey the material. In addition, 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 conveying pipeline and the auxiliary conveying pipeline is adjusted by the first flow controller and the second flow controller to improve the precise control of the gas volume and improve the conveying effect.

[0017] In a specific feasible implementation, 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 conveying pipeline and the auxiliary conveying 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 the first set pressure value, the gas volume conveyed by the main conveying pipeline is adjusted to 60% - 90% of the total gas volume by the first flow controller, and the gas volume conveyed by the auxiliary conveying pipeline is adjusted to 10% - 40% of the total gas volume by 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 conveyed by the main conveying pipeline is adjusted to 50% of the total gas volume by the first flow controller, and the gas volume conveyed by the auxiliary conveying pipeline is adjusted to 50% of the total gas volume by the second flow controller; When the pressure detected by the first pressure sensor is greater than the second set pressure value, the gas volume conveyed by the main conveying pipeline is adjusted to 10% - 40% of the total gas volume by the first flow controller, and the gas volume conveyed by the auxiliary conveying pipeline is adjusted to 60% - 90% of the total gas volume by the second flow controller. Description of the Drawings

[0018] In the drawings, unless otherwise specified, the same reference numerals throughout the several drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments provided in accordance with the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0019] Figure 1 Schematic structural diagram of the pneumatic conveying system provided by the embodiment of the present application; Figure 2 Flow chart of the conveying method provided by the embodiment of the present application. Detailed implementation manners

[0020] 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 with reference to the accompanying drawings.

[0021] It should be noted that unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The "first", "second" and similar terms used in one or more embodiments of this specification do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] To facilitate the understanding of the pneumatic conveying system provided by the embodiment of the present application, its application scenario will be described first. The pneumatic conveying system provided by the embodiment of the present application is applied in the logistics conveying industry. When conveying materials, the pneumatic conveying system can conveniently convey granular or powdery materials. However, during the process of conveying materials, the control of the air volume is relatively rough, resulting in serious waste of air volume. For this reason, the embodiment of the present application provides a pneumatic conveying system to improve the energy consumption of the pneumatic conveying system. It will be described in detail below with reference to specific drawings and embodiments.

[0023] Refer to Figure 1 , Figure 1 shows a schematic structural diagram of the pneumatic conveying system provided by the embodiment of the present application. The pneumatic conveying system provided by the embodiment of the present application includes an air source, a pressure tank 400 and a conveying pipeline. Among them, the air source is used to provide the 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 required position through the airflow provided by the air source. For the convenience of understanding, the structure and functions of the pneumatic conveying system will be introduced in detail below.

[0024] Continue to refer to Figure 1, the air source provided by the embodiments of the present application can be an air compressor 100. The air compressor 100 provides compressed air for the pneumatic conveying system and is the power source of the pneumatic conveying system. Of course, in addition to the air compressor 100, other devices that can provide compressed air can also be selected as the air source according to needs, and no further examples will be given in the embodiments of the present application.

[0025] The pressure feeding tank 400, as a device for carrying materials, is an overall tank body 410. The pressure feeding tank 400 has a loading port and a discharging end. Materials can be put into the pressure feeding tank 400 through the loading port, and during pneumatic conveying, the materials are discharged through the discharging end. In an implementable solution, the feeding port is located at the top of the pressure feeding tank 400, and the discharging end is located at the bottom of the pressure feeding tank 400 to facilitate the input and output of materials.

[0026] The conveying pipeline provided by the embodiments of the present application, as the main functional component of the pneumatic conveying system, can convey the materials in the pressure feeding tank 400 to the required position through the compressed air provided by the air source. Specifically, 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 air source. That is, the compressed air conveyed by the air source is respectively conveyed into the main conveying pipeline 200 and the auxiliary conveying pipeline 300, and the materials in the pressure feeding tank 400 are conveyed to the required position through the cooperation of the main conveying pipeline 200 and the auxiliary conveying pipeline 300.

[0027] When specifically setting the main conveying pipeline 200 and the auxiliary conveying pipeline 300, the main conveying pipeline 200 includes three parallel branch conveying pipelines. For convenience of description, the three branch conveying pipelines are respectively named 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 feeding tank 400 and is used to apply pressure to the pressure feeding tank 400. This pressure application refers to applying pressure to the materials in the pressure feeding tank 400 to facilitate the output of the materials from the discharging end. The second branch conveying pipeline 230 is connected to the pressure feeding tank 400 and is used to blow loose the materials stored in the pressure feeding tank 400. The above-mentioned fluidizing the materials in the pressure feeding tank 400 means that when the materials are stored in the pressure feeding tank 400, the materials are blown loose by air flow so that the materials can flow out of the pressure feeding tank 400 smoothly, avoiding the situation that the materials are piled up and compacted, resulting in blockage of the discharging end. The third branch conveying pipeline 240 is connected to the material conveying pipe 420 of the pressure feeding tank 400 and is used to convey materials. During use, due to its own weight, the materials fall from the pressure feeding tank 400 into the material conveying pipe 420 of the pressure feeding tank. At the same time, the first branch conveying pipeline 220 applies pressure to the pressure feeding tank 400, which further pushes the materials from the pressure feeding tank 400 into the material conveying pipe 420. In addition, when the second branch conveying pipeline 230 conveys materials, it blows loose the materials to avoid blockage of the materials, thus making it more convenient for the materials to be conveyed smoothly.

[0028] The secondary conveying pipeline 300 is used to cooperate with the main conveying pipeline 200 to improve the blockage situation of materials during conveying. During specific installation, the secondary conveying pipeline 300 is communicated with the material conveying pipe 420. For the convenience of description, the positions where the main conveying pipeline 200 is communicated with the material conveying pipe 420 and the position where the secondary conveying pipeline 300 is communicated with the material conveying pipe 420 are defined. The position where the third conveying pipeline 240 is communicated with the material conveying pipe 420 is the first position, and the position where the secondary conveying pipeline 300 is communicated with the material conveying pipe 420 is the second position.

[0029] During the conveying of materials, the discharge end of the pressure feeding tank 400 is extremely prone to blockage. To improve the blockage situation, the secondary conveying pipeline 300 is arranged to convey gas into the material conveying pipe 420, so as to increase the looseness of the materials in the material conveying pipe 420 and improve the blockage situation. Specifically, the secondary conveying pipeline 300 is arranged side by side with the third conveying pipeline 240, and a pipeline communicated with the material conveying pipe 420 is arranged on the secondary conveying pipeline 300. When a material blockage occurs, the secondary conveying pipeline 300 can be communicated with the material conveying pipe 420 at the blockage position section, so as to fluidize the material flow through the flow of air, thereby dredging the blocked material and facilitating the transportation of the material.

[0030] It can be seen from the above description that during the material conveying, the gas volume on the main conveying pipeline 200 and the secondary conveying pipeline 300 directly affects the material transportation. To facilitate the matching of the material conveying, a flow controller is also arranged in the pneumatic conveying system provided in the embodiment of the present application to control the gas volume conveyed to the main conveying pipeline 200 and the secondary conveying pipeline 300 through the flow controller. For the convenience of description, the two flow controllers are respectively named 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 (specifically, the first conveying pipeline 210), and the second flow controller 301 is arranged on the secondary conveying pipeline 300. The gas volume conveyed to the main conveying pipeline 200 is controlled through the first flow controller 201, and the gas volume conveyed to the secondary conveying pipeline 300 is controlled through the second flow controller 301 at the same time.

[0031] In addition, to determine whether material blockage occurs during material transportation, a pressure sensor for detecting pressure is further included in the pneumatic conveying system provided in the embodiment of the present application. For convenience of description, this pressure sensor is named the first pressure sensor 500. The first pressure sensor 500 is disposed on the third branch conveying pipeline 240, and the first pressure sensor 500 is disposed between a first position and a second position. That is, when the first pressure sensor 500 is disposed, the first pressure sensor 500 is located at a position close to the output end of the pressure-feeding tank 400. When materials are transported, the position where the output end of the pressure-feeding tank 400 communicates with the material conveying pipe 420 is an elbow, so material blockage is very likely to occur at this position. By disposing the first pressure sensor 500 at this position, the blockage condition of materials at this position can be detected.

[0032] When specifically controlling the gas volume distribution of the gas source, it is controlled by a controller. Specifically, the controller is configured 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 transportation condition 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 materials can be smoothly transported to the required position at different stages of material transportation and when blockage occurs.

[0033] It can be seen from the above description that the pneumatic conveying system provided in the embodiment of the present application realizes fluidization, pressure application and material transportation of the materials in the pressure-feeding tank 400 through the main conveying pipeline 200, and the auxiliary conveying pipeline 300 assists the main conveying pipeline 200 in transporting the materials. 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 through 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 the energy consumption.

[0034] In an optional implementation, the gas source provides compressed air for the conveying pipeline, which is the power source of pneumatic conveying. Specifically, the gas source includes an air compressor 100 and an air filter 120 communicated with the air compressor 100. During operation, the compressed air generated by the air compressor 100 enters the main conveying pipeline 200 and the auxiliary conveying pipeline 300 respectively; in order to prevent impurities from polluting the materials and electrical components, an air filter 120 is installed at the discharge end of the air compressor 100, and both the main conveying pipeline 200 and the auxiliary conveying pipeline 300 are connected to the air compressor 100 through the air filter 120.

[0035] In order to detect the source pressure of compressed air, a source pressure sensor is also installed between the discharge end of the air compressor 100 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 second pressure sensor 110. When the pressure detected by the second pressure sensor 110 is less than the set value, the conveying program is not allowed to start to avoid problems such as difficult conveying, blockage, and extended conveying time.

[0036] The source pressure of compressed air is often above 0.6 Mpa. In order to protect the anti-pressure of the conveying pipeline and the components in the pipeline, the relatively high source pressure is usually adjusted to the specified output pressure. Therefore, a first pressure reducing valve 202 is provided on the main conveying pipeline 200, and a second pressure reducing valve 302 is provided on the auxiliary conveying pipeline 300. Specifically, the first pressure reducing valve 202 is provided on the first conveying pipeline 210.

[0037] 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 their valve flow characteristics, use the pressure sensors before and after the valve of the controller to continuously measure the pressure drop, and the measured pressure difference and the valve flow characteristics are used to determine the parameters of the control valve volume flow (process value). The measured value is compared with the preset value, and after comparison, the value is obtained in the PID controller (Proportion Integration Differentiation), and is set as a new set point to the positioner to automatically adjust the opening of the valve to ensure that the preset flow is met and the purpose of accurately controlling the flow is achieved. It avoids the problem that the change of the outlet pressure of the pressure reducing valve caused by the pressure fluctuation of the gas source leads to the change of the flow rate and the unstable operation of the conveying, and realizes the purpose of monitoring and controlling the flow rate.

[0038] In an implementable solution, the pressure feeding tank 400 further includes a tank body 410 and a feeding pipe 420 communicating with the bottom of the tank body 410; specifically, the feeding pipe 420 is connected to the tank body 410 through a butterfly valve 430. During conveying, the main conveying pipeline 200 provides aerodynamic force for the tank body 410 of the pressure feeding tank 400; for automation and safety, a top pressure sensor 411 is installed on the tank body 410 of the pressure feeding tank 400 to detect the pressure inside 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 inside the tank body 410 to below the design pressure.

[0039] In addition, the first conveying pipeline 220 is connected to the top of the tank body 410 to input gas at the top of the tank body 410, and a positive pressure is applied in the tank body 410 of the pressure tank 400. The second 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 conveying pipeline 230. The third conveying pipeline 240 is connected to the material conveying pipe 420, so that during the conveying process, the material can be carried out of the material conveying pipe 420 by the air flow provided by the third conveying pipeline 240, realizing the conveying of the material.

[0040] The main conveying pipeline 200 provided by the embodiment of the present application consists of three branch gas paths: the first conveying pipeline 220, the second conveying pipeline 230, and the third conveying pipeline 240. Compressed air is filled into the third conveying pipeline 240 and the pressure tank 400 at different conveying stages to ensure stable conveying. 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 conveying pipeline 220; a second gate valve 231 and a second angle seat valve 232 are arranged on the second conveying pipeline 230; a third gate valve 241, a third angle seat valve 242, and a second check valve 243 are arranged on the third conveying pipeline 240. Specifically, the first conveying pipeline 220 includes a first gate valve 221 connected to the first flow controller 201, a first angle seat valve 222 sequentially connected to the first gate valve 221, a first check valve 223 sequentially connected to the first angle seat valve 222, and a safety valve 224; the second conveying pipeline 230 includes a second gate valve 231 connected to the first flow controller 201, a second angle seat valve 232 sequentially connected to the second gate valve 231; the third conveying pipeline 240 includes a third gate valve 241 connected to the first flow controller 201, a third angle seat valve 242 sequentially connected to the third gate valve 241, and a second check valve 243 sequentially connected to the third angle seat valve 242. The pipeline flow rates of the first conveying pipeline 220, the second conveying pipeline 230, and the third conveying pipeline 240 are respectively 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; the gate valves on their respective gas paths, the first angle seat valve 222, the second gate valve 231, and the third gate valve 241 are used to repair devices and adjust the gas volume on each pipeline. The first check valve 223 and the second check valve 243 are respectively used to conduct the first conveying pipeline 220 and the pressure tank 400, and the third conveying pipeline 240 in one direction, preventing the material from entering the compressed air pipeline, reducing the quality of the compressed air, and damaging the pneumatic control components; In an implementable solution, the auxiliary conveying pipeline 300 includes a second conveying pipeline 330, and a plurality of branch pipelines 310 that are communicated with the second conveying pipeline 330 and arranged in parallel; wherein, the plurality of branch pipelines 310 are arranged at intervals along the length direction of the second conveying pipeline 330, and each branch pipeline 310 is communicated with the material conveying pipe 420 through a plurality of jet units 320. The above-mentioned second position is the position where the branch pipeline 310 closest to the discharge end of the pressure feeding tank 400 is connected to the material conveying pipe 420.

[0041] In specific implementation, the pneumatic conveying pipeline is connected to a plurality of branch pipelines 310, and a fourth angle seat valve 311 is further arranged on each branch pipeline 310 to control the on-off 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 regulating the flow rate through the fourth angle seat valve 311. The flow rate of the branch pipeline 310 is adjusted by controlling the opening and closing of the fourth angle seat valve 311. A jet unit 320 for supplementing air to the third branch conveying pipeline 240 is arranged on the branch pipeline 310. During operation, the jet unit 320 of the branch pipeline 310 provides gas for the material in the conveying pipeline to ensure that the material enters the target bin. No specific definition is made for the structure of the jet unit, which may only be a nozzle or a one-way boosting structure arranged on the pipeline.

[0042] In a specific implementable solution, each jet unit 320 is communicated with the corresponding branch pipeline 310 through a third one-way valve 321 to prevent the material from entering the auxiliary conveying pipeline 300.

[0043] 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 first flow controller 201 adjusts the gas volume conveyed by the main conveying pipeline 200 to 60% - 90% of the total gas volume, and the second flow controller 301 adjusts the gas volume conveyed by the auxiliary conveying pipeline 300 to 10% - 40% of the total gas volume; 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 first flow controller 201 adjusts the gas volume conveyed by the main conveying pipeline 200 to 50% of the total gas volume, and the second flow controller 301 adjusts the gas volume conveyed by the auxiliary conveying pipeline 300 to 50% of the total gas volume; When the pressure detected by the first pressure sensor 500 is greater than the second set pressure value, the first flow controller 201 adjusts the gas volume conveyed by the main conveying pipeline 200 to 10% - 40% of the total gas volume, and the second flow controller 301 adjusts the gas volume conveyed by the auxiliary conveying pipeline 300 to 60% - 90% of the total gas volume.

[0044] In a specific example, a first pressure sensor 500 is installed on the discharge elbow of the pressure feed tank 400 to detect the pressure at the discharge port of the pressure feed tank 400 and control the end of the conveying process. During the pneumatic conveying process, due to the influence of the material change in the conveying pipe 420, the pressure in the pipeline detected by the first pressure sensor 500 changes, showing a trend of first gradually increasing to a stable conveying state and then decreasing, that is, the conveying state is changing. Therefore, the gas volume distribution ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is adjusted according to the change of the pipeline pressure to ensure the stability of the conveying state. For the starting stage of conveying, the gas volume distribution ratio in the main conveying pipeline 200 is higher than 50%; after the conveying is stable, the gas volume distribution ratio in the main conveying pipeline 200 and the auxiliary conveying pipeline 300 is 50% each; when the pressure in the third conveying pipeline 240 is higher than a certain value, it can be determined that the material is blocked in the pipeline, and the gas volume distribution ratio in the compressed air pipeline of the auxiliary conveying pipeline 300 is higher than 50%, and the blocked material is flushed away by air pressure to ensure the stable operation of the conveying pipeline.

[0045] Combined with the characteristics of the flow controller and the gas volume distribution and conveying process 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. On the premise of meeting the conveying capacity, the conveying gas volume of different materials can be accurately controlled to achieve the optimal conveying gas volume and further save the consumption of compressed air.

[0046] To facilitate the understanding of the pneumatic conveying system provided by the embodiments of the present application, the following details its working process: During operation, the air compressor 100 is started, the impurities are filtered through the air filter 120, and then the compressed air after adjusting the air source pressure to a certain value through the first pressure reducing valve 202 and the second pressure reducing valve 302 respectively is filled into the main conveying pipeline 200 and the auxiliary conveying pipeline 300 of their respective pipelines to provide power for material conveying.

[0047] Before the conveyed material enters the pressure feed tank 400, it is unpacked first. When unpacking, the pressure in the pressure feed tank 400 is detected by the top pressure sensor 411 first. When the pressure in the pressure feed tank 400 is greater than 0.03 Mpa, feeding is not allowed in the pressure feed tank 400, and the butterfly valve 430 on the pressure feed tank 400 is opened to relieve pressure. When the pressure relief (less than 0.03 MP) is completed, the channel for the powder material to enter the pressure feed tank 400 from the unpacking unit is opened, the second angle seat valve 232 is opened, and unpacking starts (blowing the material to loosen the material, the first conveying pipeline 220 and the third conveying pipeline 240 are closed, and the first flow controller 201 controls the gas volume to be relatively low, about 200 - 300 cubic meters per hour). When the pressure feed level gauge on the pressure feed tank 400 detects that the pressure feed tank 400 is full of material, after the pressure feed level gauge sends a signal, the feed inlet butterfly valve 412, the second angle seat valve 232, etc. are closed, and the unpacking ends.

[0048] After the feed butterfly valve 412 is fully closed, a signal is sent to open the first angle seat valve 222 and the second angle seat valve 232, for gas-solid mixing and pressure buildup inside the tank body 410. When the pressure in the pressure feeding tank 400 builds up to the set value, the third angle seat valve 242 opens. After a 2-second delay, the butterfly valve 430 of the pressure feeding tank 400 opens, and material transportation begins. Compressed air enters the conveying pipeline (the part of the third branch conveying pipeline downstream of the conveying pipe) from the main conveying pipeline 200 and the auxiliary conveying pipeline 300, and conveys the pressurized material to the target bin through the conveying pipeline. Before transportation, first set the one-to-one transportation parameters for the material according to the material type, transportation distance, etc., then adjust the gas volume distribution ratio of the main conveying pipeline 200 and the auxiliary conveying pipeline 300 according to the change of the outlet pressure of the pressure feeding tank 400. Finally, the first flow controller 201 and the second flow controller 301 achieve precise control of the gas volume conveyed by the main conveying pipeline 200 and the auxiliary conveying pipeline 300, which helps the transportation state to operate smoothly and save energy. During transportation, it is necessary to open the valves on the corresponding branch pipeline 310 for air replenishment according to the change of the conveying pipeline pressure to prevent the problem of blocked material pipeline that cannot be dredged. During transportation, when the top pressure sensor 411 detects that the pressure in the pressure feeding 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 0.03 Mpa for 15S, a signal is sent, and the first angle seat valve 222, the second angle seat valve 232, the bottom third angle seat valve 242, the fourth angle seat valve 311, and the butterfly valve 430 of the pressure feeding tank 400 are closed, and the transportation ends. Then, it enters the tank internal pressure detection step and enters the next round of unpacking and transportation, and runs repeatedly like this.

[0049] Reference Figure 2 As shown, for easy understanding, the embodiment of the present application also provides a transportation method, which uses the Figure 1 shown pneumatic transportation system for transportation. The transportation method includes the following steps: Step 001: Fluidize the material in the pressure feeding tank 400 through the second branch pipeline 230 in the main conveying pipeline 200; For details, reference can be made to the Figure 1 relevant description.

[0050] Step 002: Apply pressure to the pressure feeding tank 400 through the first branch pipeline 220 in the main conveying pipeline 200; For details, reference can be made to the Figure 1 relevant description.

[0051] Step 003: Supply air to the material conveying pipe 420 of the pressure feeding tank 400 through the third branch conveying pipe 240 in the main conveying pipe 200 to convey the material in the pressure feeding tank 400; For details, please refer to Figure 1 the relevant description in

[0052] Step 004: Assist the conveying pipe 420 to convey the material through the air flow in the auxiliary conveying pipe 300; For details, please refer to Figure 1 the relevant description in

[0053] Step 005: Detect the pressure through the first pressure sensor 500 arranged on the third branch conveying pipe 240; wherein, the first pressure sensor 500 is located between the first position and the second position; the first position is the position where the pressure feeding tank 400 is connected to the third branch conveying pipe 240; the second position is the position where the auxiliary conveying pipe 300 is connected to the third branch conveying pipe 240; For details, please refer to Figure 1 the relevant description in

[0054] Step 006: According to the comparison result between the pressure detected by the first pressure sensor 500 and the set pressure, adjust the gas volume ratio of the main conveying pipe 200 and the auxiliary conveying pipe 300 through the first flow controller 201 and the second flow controller 301.

[0055] Specifically, when the pressure detected by the first pressure sensor 500 is less than the first set pressure value, adjust the gas volume conveyed by the main conveying pipe 200 through the first flow controller 201 to be 60% - 90% of the total gas volume, and adjust the gas volume conveyed by the auxiliary conveying pipe 300 through the second flow controller 301 to be 10% - 40% of the total gas volume; 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, adjust the gas volume conveyed by the main conveying pipe 200 through the first flow controller 201 to be 50% of the total gas volume, and adjust the gas volume conveyed by the auxiliary conveying pipe 300 through the second flow controller 301 to be 50% of the total gas volume; When the pressure detected by the first pressure sensor 500 is greater than the second set pressure value, adjust the gas volume conveyed by the main conveying pipe 200 through the first flow controller 201 to be 10% - 40% of the total gas volume, and adjust the gas volume conveyed by the auxiliary conveying pipe 300 through the second flow controller 301 to be 60% - 90% of the total gas volume.

[0056] In the technical solution disclosed in this application, the material in the pressure feeding tank 400 is fluidized, pressurized, and transported through the main conveying pipeline 200, and the auxiliary conveying pipeline 300 assists the main conveying pipeline 200 in transporting the material. In addition, according to the comparison result of 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 through 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.

[0057] 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 shall be included within the protection scope of this disclosure.

[0058] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A pneumatic conveying system, characterized in that: include: A gas source, a pressure tank, a main delivery pipeline and an auxiliary delivery pipeline connected to the gas source and in parallel; wherein, The main conveying pipeline includes a first conveying pipeline, a first branch conveying pipeline connected to the first conveying pipeline and connected in parallel, a second branch conveying pipeline and a third branch conveying pipeline; wherein the first branch conveying pipeline is connected to the pressure tank and is used to pressurize the pressure tank; the second branch conveying pipeline is connected to the pressure tank and is used to loosen the materials stored in the pressure tank; the third branch conveying pipeline is connected to the material delivery pipe of the pressure tank and is used to transport materials; The auxiliary conveying pipeline is connected to the material conveying pipe; wherein the position where the third branch conveying pipeline is connected to the material conveying pipe is the first position, and the position where the auxiliary conveying pipeline is connected to the material conveying pipe is the second position; along the direction of gas flow in the material conveying pipe, the second position is located downstream of the first position; The invention also includes a first flow controller arranged in the first conveying pipeline and a second flow controller arranged in the auxiliary conveying pipeline; and a first pressure sensor arranged in the conveying pipe; 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 delivery pipeline and the auxiliary delivery 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.

2. The pneumatic conveying system according to claim 1, 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.

3. The pneumatic conveying system according to claim 2, characterized in that: The pressure feeding tank also includes a tank body, and the feed pipe is connected to the bottom of the tank body through a butterfly valve; The first delivery pipeline is connected to the top of the tank; The second delivery pipeline is connected to the bottom of the tank; The third conveying pipeline is communicated with the material conveying pipe.

4. The pneumatic conveying system according to claim 2, characterized in that: It also includes a first gate valve, a first angle seat valve, a safety valve and a first check valve arranged on the first branch delivery pipeline; A second gate valve and a second angle seat valve provided on the second branch delivery pipeline; A third gate valve and a third angle seat valve, as well as a second one-way valve are arranged on the third branch delivery pipeline.

5. The pneumatic conveying system according to claim 2, 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.

6. The pneumatic conveying system according to claim 6, characterized in that: Each jet unit is communicated with a corresponding branch pipeline through a third one-way valve.

7. The pneumatic conveying system according to claim 5, characterized in that: Also included is a fourth angle seat valve disposed on each branch pipeline.

8. The pneumatic conveying system according to any one of claims 1 to 7, characterized in that: It also includes a first pressure reducing valve arranged on the first delivery pipeline, and a second pressure reducing valve arranged on the auxiliary delivery pipeline.

9. The pneumatic conveying system according to claim 8, characterized in that: The air source includes an air compressor and an air filter communicated with the air compressor.

10. A conveying method, characterized in that: The following steps are involved: Fluidizing the material in the pressure tank through a second branch delivery pipeline in the main delivery pipeline; Applying pressure to the pressure delivery tank via a first branch delivery pipeline in the main delivery pipeline; Supplying air to the material delivery pipe of the pressure delivery tank through the third branch delivery pipeline in the main delivery pipeline to transport the material in the pressure delivery tank; Assisting the conveying pipe to convey the material by airflow in the auxiliary conveying pipeline; The pressure is detected by a first pressure sensor disposed on the feed pipe; wherein the first pressure sensor is located between the first position and the second position; the first position is the position where the pressure tank is connected to the feed pipe; the second position is the position where the auxiliary delivery pipeline is connected to the feed pipe; 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.

11. The conveying 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.

Images