A material pneumatic conveying system

Abstract

This invention relates to the field of material conveying technology, specifically to a pneumatic material conveying system, comprising a feeding device and a storage device. The feeding device is equipped with a discharge pipe, and a first solenoid valve is installed on the discharge pipe. It also includes a conveying pipeline assembly, comprising a low-level horizontal pipe, a vertical pipe, and a high-level horizontal pipe. The suction port of a negative pressure suction device is connected to the inner cavity of the high-level horizontal pipe through the negative pressure suction pipe. A second solenoid valve is installed on the suction pipe. The air outlet of a positive pressure blowing device is connected to the air inlet of the low-level horizontal pipe through a positive pressure blowing pipe. A third solenoid valve is installed on the positive pressure blowing pipe. The signal output terminal of the central controller is connected to the signal input terminals of the first, second, and third solenoid valves, the negative pressure suction device, and the positive pressure suction device, respectively. This invention overcomes the drawback of conventional pneumatic conveying systems being prone to clumping, achieving efficient and stable conveying of materials such as chopped glass fibers.

Description

Technical Field

[0001] This invention relates to the field of material conveying technology, specifically to a pneumatic material conveying system. Background Technology

[0002] Chopped glass fiber, also known as chopped glass fiber precursor, is produced by melting quartz sand at high temperatures, drawing the precursor fibers using a special sizing agent, and then wet-cutting them online or by cutting finished glass fibers. The mainstream monofilament diameter of chopped glass fiber is 9-13 micrometers, with chopped lengths ranging from 3-25 meters, making it suitable for various fields and products. In the automotive industry, it is widely used in manufacturing automotive parts such as body shells and sound-absorbing sheets due to its good cost-effectiveness and ability to enhance material properties. In the electronics and electrical appliance fields, chopped glass fiber can be used to manufacture various mechanical products, improving their mechanical strength and modulus of elasticity. It is also widely used as a reinforcing material for thermosetting and thermoplastic resins, such as filled polytetrafluoroethylene, reinforced nylon, PP, PE, PBT, and ABS.

[0003] In related technologies, chopped glass fibers are mostly conveyed continuously via chain drives, often in conjunction with settling equipment, to evenly distribute the chopped fibers on a conveyor belt, suitable for continuous production processes such as weaving. However, chain drive systems require components such as drive rollers, driven rollers, supports, baffles, and proximity switches, resulting in a relatively large overall structure. Supports and baffles need to be installed on both sides of the conveyor belt to stabilize fiber distribution, further increasing the lateral space requirements. This leads to drawbacks such as large space occupation and a tendency for dust to escape. Additionally, conventional pneumatic conveying systems typically use pipe assemblies connected to negative pressure suction devices to convey materials. When using negative pressure suction devices for long-distance conveying, since the suction device is usually located at the end of the pipe assembly, a relatively high air pressure (generally reaching above 49 kPa) is often required to ensure suction effectiveness. The closer the chopped glass fibers are to the end of the pipe assembly during conveying, the greater the pressure they experience, making them prone to being blown apart and tangled by the high air pressure (see attached diagram). Figure 11 This affects conveying efficiency and product quality. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the object of the present invention is to provide a pneumatic material conveying system that overcomes the disadvantages of chain drive systems (large space occupation, easy dust escape) and conventional pneumatic conveying systems (easy clumping), achieving efficient and stable conveying of materials such as chopped glass fibers.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] The first aspect of the present invention provides a pneumatic material conveying system, including a feeding device and a storage device, wherein the feeding device is disposed at the raw material end and the storage device is disposed at the equipment end; further comprising:

[0007] The feeding device is equipped with a discharge pipe, and the discharge pipe is equipped with a first solenoid valve;

[0008] A conveying pipeline assembly includes a low-level horizontal pipeline arranged in a horizontal direction, a vertical pipeline arranged in a vertical direction, and a high-level horizontal pipeline arranged in a horizontal direction; the inlet end of the low-level horizontal pipeline is connected to the discharge pipe of the feeding device, and its outlet end is connected to the lower inlet of the vertical pipeline; the upper outlet of the vertical pipeline is connected to the inlet of the high-level horizontal pipeline, and the outlet of the high-level horizontal pipeline is connected to the inlet of the storage device.

[0009] A negative pressure suction device, wherein the suction port of the negative pressure suction device is connected to the inner cavity of the high-level horizontal pipe through a negative pressure suction pipe; a second solenoid valve is provided on the suction pipe;

[0010] A positive pressure blowing device, wherein the air outlet of the positive pressure blowing device is connected to the air inlet of the low-level horizontal pipe through a positive pressure blowing pipe; a third solenoid valve is provided on the positive pressure blowing pipe;

[0011] The central controller has its signal output terminals connected to the signal input terminals of the first solenoid valve, the second solenoid valve, the third solenoid valve, the negative pressure suction device, and the positive pressure suction device, respectively.

[0012] In a first aspect of the invention, as an optional embodiment, the discharge end of the low-level horizontal pipe is connected to the lower inlet of the vertical pipe via a first elbow, and the upper discharge end of the vertical pipe is connected to the inlet of the high-level horizontal pipe via a second elbow; both the first elbow and the second elbow are glass elbows made of borosilicate glass, and the coefficient of friction of the inner wall of the first elbow and the second elbow is ≤0.15.

[0013] In a first aspect of the invention, as an optional embodiment, an auxiliary air path assembly is also included, the auxiliary air path assembly comprising a compressed air delivery main and two compressed air branch pipes;

[0014] The air inlet of the main compressed air delivery pipe is connected to an external air compressor;

[0015] The inlet ends of the two compressed air split pipes are respectively connected to the outlet end of the compressed air delivery main pipe; the outlet end of one of the compressed air split pipes is connected to the lower end of the vertical pipe, and the outlet end of the other compressed air split pipe is connected to the middle of the high-level horizontal pipe.

[0016] In a first aspect of the invention, as an optional embodiment, each of the upper compressed air splitter pipes is provided with a pneumatic ball valve, a pressure reducing valve, a flow balancing valve and a check valve in sequence along the gas delivery direction.

[0017] In a first aspect of the invention, as an optional embodiment, the auxiliary air path assembly further includes a plurality of compressed air delivery branch pipes and a main compressed air delivery branch pipe;

[0018] The air inlet of the main compressed air supply branch pipe is connected to the air outlet of the main compressed air supply pipe, and its air outlet is connected to one end of the high-level horizontal pipeline near the equipment end; a pneumatic ball valve is installed on the main compressed air supply branch pipe.

[0019] The air inlets of multiple compressed air delivery branch pipes are connected to the main compressed air delivery pipe, and the air outlets of multiple compressed air delivery branch pipes are connected to the vertical pipe and the high-level horizontal pipe at equal intervals.

[0020] In a first aspect of the invention, as an optional embodiment, each of the compressed air delivery branch pipes is provided with a pressure regulating valve, a flow control valve, a fourth solenoid valve and a check valve in sequence along the gas delivery direction.

[0021] In a first aspect of the invention, as an optional embodiment, the distance between the outlets of any two adjacent compressed air delivery branches is less than or equal to 2m.

[0022] In a first aspect of the invention, as an optional embodiment, the negative pressure suction device is connected to the elevated horizontal pipe via a filter for separating material from air.

[0023] In a first aspect of the invention, as an optional embodiment, the storage device includes a feeder and a buffer tank. The feeder is installed above the buffer tank, and the feeder's inlet is connected to the outlet of a high-level horizontal pipe, while its discharge outlet is connected to the inner cavity of the buffer tank. The discharge outlet of the feeder is funnel-shaped.

[0024] In a first aspect of the invention, as an optional embodiment, an automatic packaging machine is also included, the automatic packaging machine comprising a frame and a weighing hopper assembly;

[0025] The buffer tank is mounted on top of the frame;

[0026] The weighing hopper assembly includes a hopper shell, multiple weighing mechanisms, and a unloading mechanism;

[0027] The hopper housing is installed on the upper part of the frame and located below the buffer tank, and the top inlet of the hopper housing is connected to the discharge port of the buffer tank;

[0028] Multiple weighing mechanisms are respectively installed on the frame, and the multiple weighing mechanisms are used to support and weigh the hopper shell;

[0029] The material hopper shell is equipped with an unloading mechanism at the material discharge port that can be opened to allow material to be discharged.

[0030] The signal output terminals of the multiple weighing mechanisms are respectively connected to the signal input terminal of the central controller, and the signal output terminal of the central controller is connected to the signal input terminal of the unloading mechanism.

[0031] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0032] 1. According to an embodiment of the material pneumatic conveying system of the present invention, during operation, the central controller issues a command to open the solenoid valve associated with the negative pressure suction device. The negative pressure suction device starts, generating a negative pressure environment, and sucks a preset amount (12-15 kg) of glass fiber material from the feeding device into the low-level horizontal pipe. The central controller issues a command to close the solenoid valve associated with the negative pressure suction device and open the solenoid valve associated with the positive pressure blowing device. The positive pressure blowing device starts, blowing positive pressure gas into the low-level horizontal pipe. Under the pushing action of the positive pressure gas, the material is blown and smoothly advances along the low-level horizontal pipe, the vertical pipe, and the high-level horizontal pipe. The material reaches the outlet of the high-level horizontal pipe and enters the storage device for storage or further processing. Thus, through the material pneumatic conveying system of the present invention, the conveying pipe assembly includes a low-level horizontal pipe, a vertical pipe, and a high-level horizontal pipe. This design allows materials to be flexibly conveyed in three-dimensional space, adapting to different production environments. At the same time, the airtightness of the pipe assembly effectively prevents dust from escaping, improving the production environment. The negative pressure suction device ensures that materials are accurately drawn into the pipeline in a preset amount. Since materials like chopped glass fibers tend to adhere to the pipe walls, this invention uses negative pressure suction to prevent blockage of the discharge pipe. Because only a small amount of material needs to be pushed at a time, and the positive pressure blowing device is closer to the lower horizontal and vertical pipes, it ensures smooth material movement within the conveying pipeline assembly even with lower output air pressure, preventing glass fibers from clumping during transport. Furthermore, the automated and intelligent control of the central controller makes the entire conveying process more efficient and stable.

[0033] 2. The material pneumatic conveying system according to an embodiment of the present invention further includes an auxiliary air path assembly. After material conveying is completed, the first solenoid valve, the second solenoid valve, and the third solenoid valve are closed to ensure that the material conveying system is in a closed state. Compressed air is delivered to the main compressed air conveying pipe by an external air compressor, and a certain pressure and flow rate are maintained in the main pipe. The compressed air enters the lower end of the vertical pipe and the middle of the high-level horizontal pipe through two compressed air diversion pipes, respectively. In the vertical pipe, the compressed air blows away material that adheres to the inner wall of the pipe due to friction or static electricity, preventing blockage. In the high-level horizontal pipe, the compressed air agitates and blows, similarly preventing material adhesion and blockage. Thus, the addition of the auxiliary air path assembly effectively blows away material that adheres to the inner wall of the pipe due to friction or static electricity, avoiding pipe blockage problems. Through regular blowing, the pipe is kept clean and unobstructed, improving the efficiency and stability of material conveying. The one-way valve prevents reverse airflow, protecting the safety of the compressed air conveying system and the material conveying system. The addition of the pneumatic ball valve enables flexible control of the air path, allowing the diversion pipes to be opened or closed as needed. The pressure reducing valve is used to regulate the airflow pressure, ensuring that the airflow pressure is moderate during the purging process, which can effectively purge without damaging the pipes or materials. The flow balancing valve ensures that the airflow in the two branch pipes is balanced, avoiding differences in purging effect caused by uneven flow.

[0034] 3. In the material pneumatic conveying system according to embodiments of the present invention, to avoid differences in purging effect caused by uneven flow, the present invention further designs multiple compressed air conveying branch pipes. Compressed air, after being output from the air compressor, enters the main compressed air conveying pipe. The compressed air in the main pipe enters multiple locations in the vertical pipe and the elevated horizontal pipe through multiple compressed air conveying branch pipes. On each branch pipe, a pressure regulating valve and a flow control valve work together to ensure that the output compressed air pressure and flow are stable and meet the purging requirements. A fourth solenoid valve controls the opening and closing of the branch pipe according to actual needs, achieving flexible purging control. A one-way valve prevents airflow from flowing backward in the branch pipe, protecting the safety of the system. Through multiple equally spaced compressed air conveying branch pipes, uniform purging of the vertical pipe and the elevated horizontal pipe is achieved, avoiding differences in purging effect caused by uneven flow. Uniform purging ensures the cleanliness and unobstructed flow of the pipes, improving the efficiency and stability of material conveying. The addition of the fourth solenoid valve enables flexible control of the branch pipes, allowing specific branch pipes to be opened or closed according to actual needs. In particular, by selectively opening branch pipes at specific locations, targeted cleaning of specific areas of the pipeline can be achieved, improving cleaning efficiency and effectiveness. It is not necessary to open all branch pipes at the same time, which can save compressed air resources and reduce energy consumption.

[0035] 4. According to the material pneumatic conveying system of this embodiment, when the material in the low-level horizontal pipe is pushed to the first bend by positive pressure gas, the material can smoothly pass through the bend and enter the vertical pipe due to the smooth inner wall and low coefficient of friction of the glass bend. Similarly, when the material rises in the vertical pipe and reaches the second bend, it can also smoothly pass through the bend and enter the high-level horizontal pipe, eventually reaching the discharge port for storage or further processing. Because the inner wall of the glass bend is exceptionally smooth, the material conveying resistance is low, and the coefficient of friction on the glass surface is low, effectively reducing the adhesion of glass fibers at the bend, making it particularly suitable for conveying fragile materials such as glass fibers. Furthermore, the transparency of the glass material allows for real-time observation of the material conveying status, facilitating the monitoring of blockages or material adhesion problems. Attached Figure Description

[0036] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0037] Figure 1 This is a schematic diagram of the pneumatic material conveying system of the present invention;

[0038] Figure 2 This is a schematic diagram of the feeding device, positive pressure blowing device and low-level horizontal pipe of the present invention.

[0039] Figure 3 This is a schematic diagram of the conveying pipeline assembly of the present invention;

[0040] Figure 4 This is a schematic diagram of the negative pressure suction device of the present invention;

[0041] Figure 5 This is a schematic diagram of the material storage device of the present invention;

[0042] Figure 6 This is a schematic diagram of the auxiliary air path assembly of the present invention;

[0043] Figure 7 This is a schematic diagram of the automatic packaging machine of the present invention;

[0044] Figure 8 This is a schematic diagram of the weighing hopper assembly of the automatic packaging machine of the present invention;

[0045] Figure 9 This is a circuit block diagram of the present invention;

[0046] Figure 10 A photograph of chopped glass fibers obtained after being conveyed by the pneumatic material conveying system of the present invention;

[0047] Figure 11A photograph of chopped glass fibers obtained after being conveyed by a conventional pneumatic conveying system.

[0048] In the diagram, 10 is the feeding device; 11 is the discharge pipe; 12 is the first solenoid valve; 20 is the storage device; 21 is the feeder; 22 is the buffer tank; 30 is the conveying pipeline assembly; 31 is the low-level horizontal pipeline; 32 is the vertical pipeline; 33 is the high-level horizontal pipeline; 34 is the first elbow; 36 is the second elbow; 40 is the negative pressure suction device; 41 is the negative pressure suction pipeline; 42 is the second solenoid valve; 43 is the filter; 50 is the positive pressure blowing device; 51 is the positive pressure blowing pipeline; 52 is the third solenoid valve; and 60 is the third solenoid valve. Central controller; 70. Auxiliary air circuit assembly; 71. Compressed air main pipe; 72. Compressed air branch pipe; 73. Compressed air branch pipe; 74. Compressed air main branch pipe; 81. Pneumatic ball valve; 82. Pressure reducing valve; 83. Flow balancing valve; 84. Check valve; 85. Pressure regulating valve; 86. Flow control valve; 87. Fourth solenoid valve; 90. Automatic packaging machine; 91. Frame; 92. Weighing hopper assembly; 921. Hopper shell; 922. Weighing mechanism; 923. Unloading mechanism. Detailed Implementation

[0049] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0050] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0053] Example 1

[0054] Please refer to Figure 1-10 As shown, this embodiment provides a pneumatic material conveying system, including a feeding device 10 and a storage device 20. The feeding device 10 is used to be installed at the raw material end, and the storage device 20 is used to be installed at the equipment end. A discharge pipe 11 is provided on the feeding device 10, and a first solenoid valve 12 is provided on the discharge pipe 11. It also includes a conveying pipeline assembly 30, a negative pressure suction device 40, a positive pressure blowing device 50, and a central controller 60.

[0055] Specifically, the conveying pipeline assembly 30 includes a low-level horizontal pipeline 31 arranged in the horizontal direction, a vertical pipeline 32 arranged in the vertical direction, and a high-level horizontal pipeline 33 arranged in the horizontal direction; the inlet end of the low-level horizontal pipeline 31 is connected to the discharge pipe 11 of the feeding device 10, and its outlet end is connected to the lower inlet of the vertical pipeline 32; the upper outlet of the vertical pipeline 32 is connected to the inlet of the high-level horizontal pipeline 33, and the outlet of the high-level horizontal pipeline 33 is connected to the inlet of the storage device 20.

[0056] Specifically, the suction port of the negative pressure suction device 40 is connected to the inner cavity of the high-level horizontal pipe 33 through the negative pressure suction pipe 41; a second solenoid valve 42 is installed on the suction pipe.

[0057] Specifically, the outlet of the positive pressure blowing device 50 is connected to the inlet of the low-level horizontal pipe 31 through the positive pressure blowing pipe 51; a third solenoid valve 52 is installed on the positive pressure blowing pipe 51.

[0058] Specifically, the signal output terminal of the central controller 60 is connected to the signal input terminals of the first solenoid valve 12, the second solenoid valve 42, the third solenoid valve 52, the negative pressure suction device 40, and the positive pressure suction device, respectively.

[0059] Based on the above structure, the central controller 60 issues a command to open the solenoid valve associated with the negative pressure suction device 40. The negative pressure suction device 40 starts, generating a negative pressure environment, and sucks a preset amount (12-15 kg) of glass fiber material from the feeding device 10 into the low-level horizontal pipe 31. The central controller 60 issues a command to close the solenoid valve associated with the negative pressure suction device 40 and open the solenoid valve associated with the positive pressure blowing device 50. The positive pressure blowing device 50 starts, blowing positive pressure gas into the low-level horizontal pipe 31. Under the pushing action of the positive pressure gas, the material is blown and smoothly advances along the low-level horizontal pipe 31, the vertical pipe 32, and the high-level horizontal pipe 33. The material reaches the outlet of the high-level horizontal pipe 33 and enters the storage device 20 for storage or further processing. Thus, through the material pneumatic conveying system of the present invention, the conveying pipe assembly 30 includes a low-level horizontal pipe 31, a vertical pipe 32, and a high-level horizontal pipe 33. This design allows materials to be flexibly conveyed in three-dimensional space, adapting to different production environments. Meanwhile, the airtightness of the pipeline assembly effectively prevents dust from escaping, improving the production environment. The negative pressure suction device 40 ensures that materials are accurately sucked into the pipeline in a preset amount. Since materials like chopped glass fibers tend to adhere to the pipe wall, the negative pressure suction device 40 prevents the discharge pipe 11 from becoming clogged. Because only a small amount of material needs to be pushed at a time, and the positive pressure blowing device is closer to the lower horizontal pipe 31 and vertical pipe 32, the positive pressure blowing device 50 can ensure the material moves smoothly through the conveying pipeline assembly 30 even with a relatively low output air pressure, preventing the glass fibers from clumping during transport. Furthermore, the automated and intelligent control of the central controller 60 makes the entire conveying process more efficient and stable.

[0060] In this embodiment, the negative pressure suction device 40 can be a suction fan or a suction pump, and the positive pressure blowing device can be a Roots blower.

[0061] In a preferred embodiment of the present invention, the discharge end of the low-level horizontal pipe 31 is connected to the lower inlet of the vertical pipe 32 through the first elbow 34, and the upper outlet of the vertical pipe 32 is connected to the inlet of the high-level horizontal pipe 33 through the second elbow 35; both the first elbow and the second elbow are glass elbows made of borosilicate glass, and the friction coefficient of the inner wall of the first elbow and the second elbow is ≤0.15.

[0062] In practical operation, when the material in the lower horizontal pipe 31 is pushed to the first bend by positive pressure gas, the material can smoothly pass through the bend and enter the vertical pipe 32 due to the smooth inner wall and low coefficient of friction of the glass bend. Similarly, when the material rises in the vertical pipe 32 and reaches the second bend, it can also smoothly pass through the bend and enter the upper horizontal pipe 33, eventually reaching the outlet for storage or further processing. Because the inner wall of the glass bend is exceptionally smooth, the material conveying resistance is low, and the glass surface friction coefficient is low, effectively reducing the adhesion of glass fibers at the bend, making it particularly suitable for conveying fragile materials such as glass fibers. Furthermore, the transparency of the glass material allows for real-time observation of the material conveying status, facilitating the monitoring of blockages or material adhesion problems.

[0063] In a preferred embodiment of the present invention, an auxiliary air path assembly 70 is also included, which includes a compressed air delivery main pipe 71 and two compressed air branch pipes 72.

[0064] The air inlet of the compressed air delivery main pipe 71 is connected to an external air compressor;

[0065] The inlet ends of the two compressed air split pipes 72 are respectively connected to the outlet ends of the compressed air delivery main pipe 71; the outlet end of one of the compressed air split pipes 72 is connected to the lower end of the vertical pipe 32, and the outlet end of the other compressed air split pipe 72 is connected to the middle of the high-level horizontal pipe 33.

[0066] In a preferred embodiment of the present invention, each upper compressed air splitter pipe 72 is provided with a pneumatic ball valve 81, a pressure reducing valve 82, a flow balancing valve 83 and a one-way valve 84 in sequence along the gas delivery direction.

[0067] Based on the above structure, after material conveying is completed, the first solenoid valve 12, the second solenoid valve 42, and the third solenoid valve 52 are closed to ensure that the material conveying system is in a closed state. Compressed air is delivered to the main compressed air conveying pipe 71 by an external air compressor, and a certain pressure and flow rate are maintained in the main pipe. The compressed air enters the lower end of the vertical pipe 32 and the middle of the high-level horizontal pipe 33 through two compressed air branch pipes 72, respectively. In the vertical pipe 32, the compressed air blows away material that has adhered to the inner wall of the pipe due to friction or static electricity, preventing blockage. In the high-level horizontal pipe 33, the compressed air agitates and blows, similarly preventing material adhesion and blockage. Thus, the addition of the auxiliary air circuit assembly 70 effectively blows away material that has adhered to the inner wall of the pipe due to friction or static electricity, avoiding pipe blockage problems. Through regular blowing, the pipes are kept clean and unobstructed, improving the efficiency and stability of material conveying. The one-way valve 84 prevents reverse airflow, protecting the safety of the compressed air conveying system and the material conveying system. The addition of the pneumatic ball valve 81 enables flexible control of the air path, allowing the diverter pipe to be opened or closed as needed. The pressure reducing valve 82 regulates the airflow pressure, ensuring moderate pressure during the purging process, effectively purging without damaging the pipes or materials. The flow balancing valve 83 ensures balanced airflow in the two diverter pipes, preventing differences in purging performance due to uneven flow.

[0068] In a preferred embodiment of the present invention, the auxiliary air path assembly 70 further includes a plurality of compressed air delivery branch pipes 73 and a main compressed air delivery branch pipe 74;

[0069] The air inlet of the main compressed air supply branch pipe 74 is connected to the air outlet of the main compressed air supply pipe 71, and its air outlet is connected to one end of the high-level horizontal pipe 33 near the equipment end; a pneumatic ball valve 81 is provided on the main compressed air supply branch pipe 74.

[0070] The air inlet ends of multiple compressed air delivery branch pipes 73 are respectively connected to the compressed air delivery main pipe, and the air outlet ends of multiple compressed air delivery branch pipes 73 are respectively connected to the vertical pipe 32 and the high-level horizontal pipe 33 at equal intervals.

[0071] In a preferred embodiment of the present invention, each compressed air delivery branch pipe 73 is provided with a pressure regulating valve 85, a flow control valve 86, a fourth solenoid valve 87 and a one-way valve 84 in sequence along the gas delivery direction.

[0072] Based on the above structure, to avoid differences in purging effect caused by uneven flow, this invention further designs multiple compressed air delivery branch pipes 73. Compressed air, after being output from the air compressor, enters the main compressed air delivery pipe 71. The compressed air in the main pipe enters multiple locations in the vertical pipe 32 and the elevated horizontal pipe 33 through the multiple compressed air delivery branch pipes 73. On each branch pipe, a pressure regulating valve 85 and a flow control valve 86 work together to ensure that the output compressed air pressure and flow are stable and meet the purging requirements. A fourth solenoid valve 87 controls the opening and closing of the branch pipe according to actual needs, achieving flexible purging control. A one-way valve 84 prevents airflow from flowing backward in the branch pipe, protecting the system's safety. Through multiple equally spaced compressed air delivery branch pipes 73, uniform purging of the vertical pipe 32 and the elevated horizontal pipe 33 is achieved, avoiding differences in purging effect caused by uneven flow. Uniform purging ensures the cleanliness and unobstructed flow of the pipelines, improving the efficiency and stability of material conveying. The addition of the fourth solenoid valve 87 enables flexible control of the branch pipes, allowing specific branch pipes to be opened or closed as needed. In particular, selectively opening branch pipes at specific locations allows for targeted cleaning of specific areas of the pipeline, improving cleaning efficiency and effectiveness. It eliminates the need to open all branch pipes simultaneously, saving compressed air resources and reducing energy consumption. For example, when glass fiber adhesion is observed at a glass elbow, selectively opening the two branch pipes adjacent to the glass elbow allows for targeted cleaning of that elbow.

[0073] In a preferred embodiment of the present invention, the distance between the outlets of any two adjacent compressed air delivery branch pipes 73 is less than or equal to 2m. This equidistant layout, with a spacing of less than or equal to 2m, ensures that the inner wall of the pipe is thoroughly and uniformly purged. Simultaneously, the smaller spacing improves purging efficiency and reduces the time required for purging.

[0074] In a preferred embodiment of the invention, the negative pressure suction device 40 is connected to a high-level horizontal pipe 33 via a filter 43, which is used to separate the material from the air. Thus, the filter 43 can intercept and retain the suctioned material, preventing it from entering the interior of the negative pressure suction device 40 or being released into the environment.

[0075] In a preferred embodiment of the present invention, the storage device 20 includes a feeder 21 and a buffer tank 22. The feeder 21 is installed above the buffer tank 22. The feed inlet of the feeder 21 is connected to the outlet of the high-level horizontal pipe 33, and its discharge outlet is connected to the inner cavity of the buffer tank 22. The discharge outlet of the feeder 21 is funnel-shaped.

[0076] Based on the above structure, the inlet of the feeder 21 is connected to the outlet of the high-level horizontal pipe 33 to receive the material sucked out from the high-level horizontal pipe 33. The outlet of the feeder 21 is connected to the inner cavity of the buffer tank 22 to discharge the material into the buffer tank 22. The outlet of the feeder 21 is designed in a funnel shape, which helps the material to be discharged into the buffer tank 22 more smoothly and reduces blockage and spillage during the discharge process. The buffer tank 22 is used to store the material discharged from the feeder 21, serving as a buffer and storage unit.

[0077] In a preferred embodiment of the present invention, the positive pressure blowing device 50 controls the gas pressure to be 35 kPa, the gas flow rate to be 5-8 m / s, the diameter of the low horizontal pipe 31 to be 159 mm, the diameter of the vertical pipe 32 to be 76 mm, and the diameter of the high horizontal pipe 33 to be 76 mm.

[0078] Example 2

[0079] Please refer to Figure 7-9 As shown, this embodiment provides a material pneumatic conveying system based on embodiment one, and also includes an automatic packaging machine 90, which includes a frame 91 and a weighing hopper assembly 92;

[0080] The buffer tank 22 is mounted on top of the frame 91;

[0081] The weighing hopper assembly 92 includes a hopper shell 921, multiple weighing mechanisms 922, and a discharge mechanism 923;

[0082] The hopper housing 921 is installed on the upper part of the frame 91 and located below the buffer tank 22. The top inlet of the hopper housing 921 is connected to the discharge port of the buffer tank 22.

[0083] Multiple weighing mechanisms 922 are respectively installed on the frame 91, and the multiple weighing mechanisms 922 are used to support and weigh the hopper shell 921;

[0084] The material discharge port of the silo shell 921 is provided with an openable unloading mechanism 923 for discharging materials;

[0085] The signal output terminals of multiple weighing mechanisms 922 are respectively connected to the signal input terminals of the central controller 60, and the signal output terminal of the central controller 60 is connected to the signal input terminal of the unloading mechanism 923.

[0086] Based on the above structure, the buffer tank 22 serves as a temporary storage container for materials, storing materials transported from the elevated horizontal pipeline 33 and providing buffering for subsequent processing or transport. When packaging is required, the material in the buffer tank 22 enters the hopper shell 921 of the weighing hopper assembly 92 through its discharge port. The weighing mechanism 922 weighs the material entering the hopper in real time and transmits the weighing signal to the central controller 60. The central controller 60 determines whether the material has reached the preset packaging weight based on the weighing signal. Once the preset weight is reached or exceeded, a control signal is sent to the unloading mechanism 923. After receiving the control signal from the central controller 60, the unloading mechanism 923 initiates the unloading operation, discharging the material from the discharge port of the hopper shell 921 into the packaging section of the packaging machine for automatic packaging. Thus, the conveying system of the present invention integrates multiple functions and achieves intelligent control through the central controller 60, reducing manual intervention and material transfer time, and improving production efficiency. The weighing mechanism 922 weighs the material in real time, and the central controller 60 controls the unloading mechanism 923 to start the unloading operation based on the weighing signal, ensuring that the amount of material packaged each time is accurate.

[0087] In a preferred embodiment, the automatic packaging machine 90 may further include an automatic bag feeding mechanism, a strapping mechanism, an automatic bag holding mechanism, and a paper tape sewing machine.

[0088] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.

[0089] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the embodiments of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A pneumatic material conveying system, comprising a feeding device and a storage device, wherein the feeding device is disposed at the raw material end, and the storage device is disposed at the equipment end; a discharge pipe is disposed on the feeding device, and a first solenoid valve is disposed on the discharge pipe; characterized in that, Also includes: A conveying pipeline assembly includes a low-level horizontal pipeline arranged in a horizontal direction, a vertical pipeline arranged in a vertical direction, and a high-level horizontal pipeline arranged in a horizontal direction; the inlet end of the low-level horizontal pipeline is connected to the discharge pipe of the feeding device, and its outlet end is connected to the lower inlet of the vertical pipeline; the upper outlet of the vertical pipeline is connected to the inlet of the high-level horizontal pipeline, and the outlet of the high-level horizontal pipeline is connected to the inlet of the storage device. A negative pressure suction device, wherein the suction port of the negative pressure suction device is connected to the inner cavity of the high-level horizontal pipe through a negative pressure suction pipe; a second solenoid valve is provided on the suction pipe; A positive pressure blowing device, wherein the air outlet of the positive pressure blowing device is connected to the air inlet of the low-level horizontal pipe through a positive pressure blowing pipe; a third solenoid valve is provided on the positive pressure blowing pipe; The central controller has its signal output terminals connected to the signal input terminals of the first solenoid valve, the second solenoid valve, the third solenoid valve, the negative pressure suction device, and the positive pressure suction device, respectively. It also includes an auxiliary air path assembly, which includes a main compressed air delivery pipe and two compressed air branch pipes; The air inlet of the main compressed air delivery pipe is connected to an external air compressor; The inlet ends of the two compressed air split pipes are respectively connected to the outlet ends of the compressed air delivery main pipe; the outlet end of one of the compressed air split pipes is connected to the lower end of the vertical pipe, and the outlet end of the other compressed air split pipe is connected to the middle of the high-level horizontal pipe.

2. The material pneumatic conveying system according to claim 1, characterized in that, The discharge end of the low-level horizontal pipe is connected to the lower inlet of the vertical pipe through a first elbow, and the upper discharge end of the vertical pipe is connected to the inlet of the high-level horizontal pipe through a second elbow; both the first elbow and the second elbow are glass elbows made of borosilicate glass, and the inner wall friction coefficient of the first elbow and the second elbow is ≤0.

15.

3. The material pneumatic conveying system according to claim 1, characterized in that, Each of the compressed air distribution pipes is sequentially equipped with a pneumatic ball valve, a pressure reducing valve, a flow balancing valve, and a check valve along the gas delivery direction.

4. The material pneumatic conveying system according to claim 2, characterized in that, The auxiliary air circuit assembly also includes multiple compressed air delivery branch pipes and a main compressed air delivery branch pipe; The air inlet of the main compressed air supply branch pipe is connected to the air outlet of the main compressed air supply pipe, and its air outlet is connected to one end of the high-level horizontal pipeline near the equipment end; a pneumatic ball valve is installed on the main compressed air supply branch pipe. The air inlets of multiple compressed air delivery branch pipes are connected to the main compressed air delivery pipe, and the air outlets of multiple compressed air delivery branch pipes are connected to the vertical pipe and the high-level horizontal pipe at equal intervals.

5. The material pneumatic conveying system according to claim 4, characterized in that, Each of the compressed air delivery branch pipes is sequentially equipped with a pressure regulating valve, a flow control valve, a fourth solenoid valve, and a check valve along the gas delivery direction.

6. The material pneumatic conveying system according to claim 5, characterized in that, The distance between the outlets of any two adjacent compressed air delivery branches is less than or equal to 2m.

7. The material pneumatic conveying system according to claim 1, characterized in that, The negative pressure suction device is connected to the high-level horizontal pipe through a filter, which is used to separate the material from the air.

8. The material pneumatic conveying system according to claim 1, characterized in that, The storage device includes a feeder and a buffer tank. The feeder is installed above the buffer tank. The feeder's inlet is connected to the outlet of a high-level horizontal pipe, and its discharge outlet is connected to the inner cavity of the buffer tank. The feeder's discharge outlet is funnel-shaped.

9. The material pneumatic conveying system according to claim 8, characterized in that, It also includes an automatic packaging machine, which includes a frame and a weighing hopper assembly; The buffer tank is mounted on top of the frame; The weighing hopper assembly includes a hopper shell, multiple weighing mechanisms, and a unloading mechanism; The hopper housing is installed on the upper part of the frame and located below the buffer tank, and the top inlet of the hopper housing is connected to the discharge port of the buffer tank; Multiple weighing mechanisms are respectively installed on the frame, and the multiple weighing mechanisms are used to support and weigh the hopper shell; The material hopper shell is equipped with an unloading mechanism at the material discharge port that can be opened to allow material to be discharged. The signal output terminals of the multiple weighing mechanisms are respectively connected to the signal input terminal of the central controller, and the signal output terminal of the central controller is connected to the signal input terminal of the unloading mechanism.

Images