Pneumatic conveying device

Abstract

The utility model belongs to pneumatic conveying device technical field. Pneumatic conveying device, its characterized by, include: feeding mechanism, can select to connect fan conveying mechanism, send tank conveying mechanism, share conveying pipeline mechanism, including first conveying main pipe, second conveying main pipe, first conveying line, second conveying line that parallelly arranged between first conveying main pipe with second conveying main pipe, the conveying distance of second conveying line is greater than the conveying distance of first conveying line, first conveying main pipe can select to connect the discharge gate of fan conveying mechanism or the discharge gate of send tank conveying mechanism, dust removal unloading mechanism is linked together with second conveying main pipe, the discharge gate of dust removal unloading mechanism can select to connect unloading channel, circulation channel, circulation channel can select to connect fan conveying mechanism, send tank conveying mechanism. The utility model is used to solve the technical problem that single existing pneumatic conveying system can only convey single property material.

Description

Technical Field

[0001] This utility model belongs to the technical field of pneumatic conveying devices, and specifically relates to a pneumatic conveying device. Background Technology

[0002] Pneumatic conveying is a technology that transports materials using airflow, and it is widely used for conveying powders, granules, and other particulate materials. With the increasing level of industrial production and automation, the reliability, conveying efficiency, and energy-saving performance of pneumatic conveying systems have become hot topics in research and development.

[0003] Currently, pneumatic conveying systems are used in various fields, such as cement, fertilizer, food, and chemical industries. Traditional pneumatic conveying systems often rely on a single conveying method, making the selection, adjustment, and system control of fans and air compressors relatively complex, and prone to material blockage. To improve pneumatic conveying efficiency and reduce equipment wear, recent technological developments have gradually moved towards multi-functionality and intelligent control.

[0004] Existing pneumatic conveying systems include dilute phase conveying, semi-dense phase conveying, and dense phase conveying (conveying tank conveying). A single pneumatic conveying system can only convey materials of a single property. To convey materials of two or more properties, multiple sets of equipment need to be purchased, resulting in high costs and large floor space requirements. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic conveying device to solve the technical problem that a single existing pneumatic conveying system can only convey materials of a single nature.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a pneumatic conveying device, characterized in that it includes: The feeding mechanism can be optionally connected to a blower conveyor mechanism or a feeding tank conveyor mechanism; A shared conveying pipeline mechanism includes a first conveying main pipe and a second conveying main pipe, with a first conveying line and a second conveying line connected in parallel between the first conveying main pipe and the second conveying main pipe; the conveying distance of the second conveying line is greater than that of the first conveying line; the first conveying main pipe can be selectively connected to the discharge port of the blower conveying mechanism or the discharge port of the sending tank conveying mechanism; The dust removal and unloading mechanism is connected to the second conveying main pipe; the outlet of the dust removal and unloading mechanism can be optionally connected to the unloading channel or the circulation channel; the circulation channel can be optionally connected to the fan conveying mechanism or the sending tank conveying mechanism.

[0007] This invention features two conveying methods: Roots blower conveying and air compressor-conveying tank conveying. Both methods share a common conveying pipeline structure, allowing for direct switching between them. To accommodate different material characteristics, this invention can select different conveying methods, enabling switching between dilute phase conveying, semi-dense phase conveying, and convection tank conveying, thus meeting the needs of various materials and demonstrating strong applicability.

[0008] To solve the technical problem of how to implement the fan conveying mechanism, this utility model adopts the following technical solution, characterized in that the fan conveying mechanism includes: A feed hopper, wherein an airlock is provided at the bottom of the feed hopper; The feed tee has a feed inlet connected to the airlock; the air inlet of the feed tee is connected to the Roots blower via an air inlet pipe.

[0009] To solve the problem of material blockage, this utility model adopts the following technical solution: a first high material level sensor and a vent cap are installed on the feed hopper; An air flow meter and a first pressure sensor are installed on the air intake pipe; The Roots blower is a variable frequency blower. When the real-time pressure value obtained by the first pressure sensor is greater than the set pressure value, the frequency of the Roots blower is increased to increase the air volume and avoid material blockage.

[0010] To avoid the risk of material blockage, the pressure of the first pressure sensor is monitored in real time. When the pressure exceeds the set pressure value, the frequency of the Roots blower increases, the air flow meter reading increases, and the air volume increases, which quickly disperses the material in the pipeline and avoids material blockage. This is used for blower adjustment and material blockage prevention in the material conveying process.

[0011] To solve the technical problem of how to implement the tank conveying mechanism, this utility model adopts the following technical solution, wherein the tank conveying mechanism includes: The sending tank has a feed valve at its inlet and a main air inlet at its top; the sending tank has a discharge valve, a discharge bend, and a discharge straight pipe arranged sequentially at its outlet; the discharge straight pipe can be connected to the first conveying main pipe. An air storage tank, the air inlet of which is connected to an air compressor via a dryer; the air outlet of which is connected to the main air inlet via a connecting pipe.

[0012] To solve the technical problem of low conveying efficiency, the present invention adopts the following technical solution: the bottom of the sending tank is provided with a first air inlet evenly distributed around its circumference; A second air inlet is provided horizontally on the discharge bend, and the second air inlet is tangential to the discharge bend. A third air inlet is vertically installed on the discharge straight pipe; The first air inlet, the second air inlet, the third air inlet, and the main air inlet are connected in parallel on the connecting air pipe; A pressure regulating valve is installed on the connecting air pipe.

[0013] The main air inlet forms air path a1, which is the main air intake pipeline; the first air inlet forms air path a2, through which air enters the delivery tank to fluidize the material inside the tank and prevent material bridging; the second air inlet forms air path a3, which is used for tangential air intake to aid in the material conveying process; the fourth air inlet forms air path a4, which is used for vertical air replenishment to aid in the material conveying process.

[0014] To solve the technical problem of automatic start and stop of feeding, this utility model adopts the following technical solution: a safety valve, a second pressure sensor, and a venting butterfly valve are installed on the top of the feeding tank; The feeding tank is equipped with a second high-level sensor and a low-level sensor. During feeding, the feed valve and the vent butterfly valve are opened. Feeding stops when the second high-level sensor displays a signal, and the feed valve and the vent butterfly valve are closed.

[0015] To solve the technical problem of how to implement a shared conveying pipeline, this utility model adopts the following technical solution: a third pressure sensor and a fourth pressure sensor are respectively installed at the inlet and outlet ends of the first conveying main pipe; a first observation window is installed on the first conveying main pipe. A first reversing valve is installed at the intersection of the first conveying main pipe, the first conveying line, and the second conveying line; A third reversing valve is installed at the intersection of the second conveying main pipe, the first conveying line, and the second conveying line; A second reversing valve is installed on the second conveying line to convey materials to the corresponding silo; A fifth pressure sensor is provided on the second conveying main pipe; a second observation window is provided on the second conveying main pipe; The material conveying distance of the second conveying line is 180m, and the material conveying distance of the first conveying line is 80m.

[0016] To solve the technical problem of how to implement the dust removal and unloading mechanism, this utility model adopts the following technical solution, wherein the dust removal and unloading mechanism includes: A dust collector unloader is provided, which is equipped with a third high material level sensor and a weighing sensor; a discharge pipe is provided at the discharge port of the dust collector unloader, and a discharge valve is provided on the discharge pipe.

[0017] To solve the technical problem of how to switch between unloading and material circulation, this utility model adopts the following technical solution: a gravity reversing valve is installed on the discharge pipe. By adjusting the direction of the gravity reversing valve, the material is allowed to enter the unloading channel or the circulation channel.

[0018] To address the technical problem of how the feeding mechanism works, this utility model adopts the following technical solution: the feeding mechanism includes a feeding station and a feeding pipe. A tee is installed on the feeding pipe, which can optionally connect to the feeding station and the circulation channel. When conveying materials, workers input the target material into the feeding station, and the material passes through the ordinary tee and the feeding channel into the feed hopper. When conducting material performance cycle tests, the circulation channel is connected to the ordinary tee, and multiple experiments are conducted as much as possible while ensuring that the material is not crushed or has a very low crushing rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pneumatic conveying device of this utility model; Figure 2 This is a schematic diagram of the feeding mechanism of the pneumatic conveying device of this utility model; Figure 3 This is a schematic diagram of the fan conveying mechanism of the pneumatic conveying device of this utility model; Figure 4 This is a schematic diagram of the conveying mechanism of the pneumatic conveying device of this utility model; Figure 5 This is a schematic diagram of the common conveying pipeline structure of the pneumatic conveying device of this utility model; Figure 6 This is a schematic diagram of the dust removal and unloading mechanism of the pneumatic conveying device of this utility model; In the picture: 10. Pneumatic conveying device; 100 Blower conveyor mechanism; 101 Roots blower; 102 Vent cap; 103 Feed hopper; 104 Airlock; 105 Feed tee; 106 Air flow meter; 107 First pressure sensor; 108 First high level sensor; 109 Inlet pipe; 200 Conveying mechanism for the sending tank; 201 Air compressor; 202 Dryer; 203 Air storage tank; 204 Pressure regulating valve; 205 Feed valve; 206 Ventilation butterfly valve; 207 Sending tank; 209 Discharge valve; 210 Safety valve; 211 Second pressure sensor; 212 Second high level sensor; 213 Low level sensor; 214 Main air inlet; 215 First air inlet; 216 Second air inlet; 217 Third air inlet; 218 Connecting air pipe; 219 Discharge bend; 220 Discharge straight pipe; 300 Shared conveying pipeline mechanism; 310 First conveying main pipe; 320 Second conveying main pipe; 330 First conveying line; 340 Second conveying line; 351 Third pressure sensor; 352 Fourth pressure sensor; 353 Fifth pressure sensor; 361 First reversing valve; 362 Second reversing valve; 363 Third reversing valve; 371 First observation window; 372 Second observation window; 400 Feeding mechanism; 401 Feeding station; 402 Feeding pipeline; 403 Tee; 500 Dust removal and unloading mechanism; 501 Dust removal and unloading device; 502 Third high material level sensor; 503 Weighing sensor; 504 Discharge pipe; 506 Gravity reversing valve; 600 unloading channel; 700 loop channels. Detailed Implementation

[0020] The present invention will be further described below with reference to the figures.

[0021] To avoid the risk of material blockage, most existing pneumatic conveying systems still use dilute phase conveying. However, dilute phase conveying consumes a lot of energy, has low conveying efficiency, and can lead to material wear and pipeline wear.

[0022] In semi-dense phase conveying, parameters such as gas-solid ratio, flow rate, and pressure interact with each other, making the system prone to fluctuations, which can easily cause material blockage and affect production progress.

[0023] In addition, improper process design, such as under-calculated pipe diameter or low gas-solid ratio, can also easily cause material blockage.

[0024] Example 1 like Figure 1 As shown, the pneumatic conveying device 10 includes a fan conveying mechanism 100, a feeding tank conveying mechanism 200, a common conveying pipeline mechanism 300, a feeding mechanism 400, and a dust removal and unloading mechanism 500.

[0025] In one embodiment, such as Figure 2 As shown, the feeding mechanism 400 includes a feeding station 401 and a feeding pipe 402, with a tee 403 installed on the feeding pipe 402.

[0026] The feeding mechanism 400 can be optionally connected to the blower conveying mechanism 100 and the sending tank conveying mechanism 200.

[0027] In one embodiment, such as Figure 3 As shown, the blower conveying mechanism 100 includes a Roots blower 101, a feed hopper 103, and a feed tee 105.

[0028] A first high material level sensor 108 and a vent cap 102 are installed on the feed hopper 103. An airlock 104 is installed at the bottom of the feed hopper 103. The airlock 104 is preferably a frequency converter airlock.

[0029] The feed inlet of the feed tee 105 is connected to the airlock 104; the air inlet of the feed tee 105 is connected to the Roots blower 101 via the air inlet pipe 109.

[0030] In one embodiment, an air flow meter 106 and a first pressure sensor 107 are installed on the air intake pipe 109; the Roots blower 101 is preferably a variable frequency blower. When the real-time pressure value obtained by the first pressure sensor 107 is greater than the set pressure value, the frequency of the Roots blower 101 is increased to increase the air volume and avoid material blockage.

[0031] In one embodiment, such as Figure 4 As shown, the sending tank conveying mechanism 200 includes an air compressor 201, an air storage tank 203, and a sending tank 207.

[0032] A feed valve 205 is installed on the feed inlet of the sending tank 207, and a main air inlet 214 is installed on the top of the sending tank 207; In one embodiment, a safety valve 210, a second pressure sensor 211, and a venting butterfly valve 206 are provided on the top of the sending tank 203; a second high-level sensor 212 and a low-level sensor 213 are provided on the sending tank 207.

[0033] The discharge valve 209, the discharge bend 219, and the discharge straight pipe 220 are sequentially installed on the discharge port of the sending tank 207.

[0034] The air inlet of the air tank 203 is connected to the air compressor 201 via the dryer 202; the air outlet of the air tank 203 is connected to the main air inlet 211 via the connecting air pipe 217.

[0035] In one embodiment, the bottom of the sending tank 207 is provided with a first air inlet 215 evenly distributed around the periphery; the discharge bend 219 is provided with a second air inlet 216 horizontally, which is tangential to the discharge bend 219; and the discharge straight pipe 220 is provided with a third air inlet 217 vertically.

[0036] The first air inlet 215, the second air inlet 216, the third air inlet 217, and the main air inlet 214 are connected in parallel on the connecting air pipe 218. A pressure regulating valve 204 is installed on the connecting air pipe 218.

[0037] like Figure 5 As shown, the shared conveying pipeline mechanism 300 includes a first conveying main pipe 310 and a second conveying main pipe 320, with a first conveying line 330 and a second conveying line 340 connected in parallel between the first and second conveying main pipes; the conveying distance of the second conveying line 340 is greater than that of the first conveying line 330; the first conveying main pipe 310 can be selectively connected to the discharge port of the blower conveying mechanism or the discharge port of the sending tank conveying mechanism. The first conveying main pipe 310 can be connected to the discharge straight pipe 216 or the discharge port of the inlet tee 105.

[0038] In one embodiment, a third pressure sensor 351 and a fourth pressure sensor 352 are respectively provided at the inlet and outlet ends of the first conveying main pipe 310; a first observation window 371 is provided on the first conveying main pipe 310. A first reversing valve 361 is installed at the intersection of the first conveying main pipe 310, the first conveying line 330, and the second conveying line 340; A third reversing valve 363 is installed at the intersection of the second conveying main pipe 320, the first conveying line 330, and the second conveying line 340; A second reversing valve 362 is installed on the second conveying line 340 to convey materials to the corresponding silo; A fifth pressure sensor 353 is installed on the second conveying main pipe 320; a second observation window 372 is installed on the second conveying main pipe 320; The material conveying distance of the second conveying line 340 is 180m, and the material conveying distance of the first conveying line 330 is 80m.

[0039] This utility model has two conveying pipelines, with material conveying distances of 80 meters and 180 meters respectively, and can collect conveying parameters (air volume, pressure, conveying capacity) at different conveying distances as needed.

[0040] The dust removal and unloading mechanism 500 is connected to the second conveying main pipe 320; the outlet of the dust removal and unloading mechanism 500 can be connected to the unloading channel or the circulation channel; the circulation channel can be connected to the fan conveying mechanism or the sending tank conveying mechanism.

[0041] Specifically, such as Figure 6 As shown, the dust removal and unloading mechanism 500 includes a dust removal unloader 501, on which a third high material level sensor 502 and a weighing sensor 503 are installed; a discharge pipe 504 is installed at the discharge port of the dust removal unloader 501, and a discharge valve 505 is installed on the discharge pipe 504. The discharge valve 505 is preferably a knife gate valve.

[0042] In one embodiment, a gravity reversing valve 506 is installed on the discharge pipe 504. By adjusting the direction of the gravity reversing valve, the material can enter the discharge channel 600 or the circulation channel 700. The tee 403 on the feeding pipe 402 can be optionally connected to the feeding station 401 or the circulation channel 700.

[0043] The working process of the pneumatic conveying device in this embodiment is as follows: I. Roots Blower Conveying: This conveying method involves equipment including a Roots blower 101, an air flow meter 106, a pressure sensor 107, a feed hopper 103, a variable frequency feed airlock 104, a feed tee 105, and common parts including a first conveying main pipe 310, a second conveying main pipe 320, a first conveying line 330, a second conveying line 340, a first observation window 371, a second observation window 372, a third pressure sensor 351, a fourth pressure sensor 352, a fifth pressure sensor 353, a first reversing valve 361, a second reversing valve 362, a third reversing valve 363, a dust collector unloader 501, and a feeding station 401, etc.

[0044] Working principle: 1. Workers input the target material into the feeding station 401. The material passes through a standard tee 403 and the feeding channel 402 into the feeding hopper 103. The feeding hopper 103 is equipped with a vent cap 102 to facilitate the discharge of air from the hopper. When the material reaches a certain height, the first high material level sensor 108 displays the level, and feeding stops.

[0045] Switch the first reversing valve 361, the second reversing valve 362, and the third reversing valve 363 to select the first conveying line 330 (total conveying distance 80 meters) or the line 340 (total conveying distance 180 meters) for material conveying.

[0046] 2. Start the Roots blower 101 and input the relevant parameters to control its airflow. After the pressure sensor 107 reading stabilizes, input the rotation frequency of the variable frequency feed airlock 104 and start it. At this time, the material falls into the feed tee 105 and flows along the conveying pipe. Its flow pattern can be observed through the first observation window 371 and the first observation window 372. Finally, the material is sent to the dust collector unloader 501. The dust collector unloader 501 is equipped with a weighing sensor 503 to measure the weight of the material inside the dust collector unloader 501 in real time, thereby quickly calculating the conveying capacity.

[0047] 3. The frequency of the Roots blower 101 is automatically adjustable. During semi-dense phase conveying, there is a risk of material blockage in the conveying pipeline. If blockage occurs, the pressure of the Roots blower 101 will exceed the rated value, causing material accumulation in the pipeline. To avoid this risk, an automatic adjustment program is activated. This program monitors the pressure of the pressure sensor 107 in real time. When the pressure exceeds 80 kPa, the frequency of the Roots blower 101 automatically increases, the reading of the air flow meter 106 increases, and the airflow increases, quickly dispersing the material in the pipeline and preventing blockage.

[0048] 4. The dust collector unloader 501 is equipped with a discharge valve 505 with controllable opening. It is normally closed during the conveying process, and opens to a certain degree when unloading or circulation testing is required, thereby controlling the material flow rate. Below the discharge valve 505 is a gravity reversing valve 506. By adjusting its direction, the material is allowed to enter the discharge channel 600 or the circulation channel 700.

[0049] II. Delivery Tank Conveying: This conveying method involves air compressor 201, delivery tank 202, and the common parts mentioned above.

[0050] 1. When using air compressor 201 for conveying, connect the material outlet below the sending tank 207 to the first conveying main pipe 310 upstream of the third pressure sensor 351; connect the feed valve 205 above and the ordinary tee 403 below to achieve the switching between the two conveying methods.

[0051] 2. Feed material at feeding station 401 in the same manner. When feeding, open the feed valve 205 and the vent butterfly valve 206. Stop feeding when the second high material level sensor 212 displays a signal, and close the feed valve 205 and the vent butterfly valve 206.

[0052] 3. Select either the first conveyor line 330 or the second conveyor line 340 in the same manner.

[0053] 4. Open the discharge valve 209, adjust the pressure regulating valve 204, start the air compressor 201, and the air enters the storage tank 203 through the dryer 202. Finally, it enters the delivery tank in four directions: (1) the main air inlet 214, which forms the a1 air path and is the main air inlet pipeline; (2) the first air inlet 215, which forms the a2 air path. The air enters the delivery tank 207 through the first air inlet 215 to fluidize the material in the tank and prevent the material from arching; (3) the second air inlet 216, which forms the a3 air path and is used for tangential air intake to promote the material conveying process; (4) the fourth air inlet 217, which forms the a4 air path and is used for vertical air replenishment to promote the material conveying process.

[0054] 5. Data parameters monitored during the transportation process, such as pipeline pressure and production capacity, are the same as those for Roots blower transportation.

[0055] 6. After the conveying is completed, you can also choose the unloading channel 600 or the circulation channel 700.

[0056] The conveying process of this utility model can be adjusted to semi-dense phase conveying, which reduces material wear and pipeline wear, while saving energy. The system is equipped with an automatic control program. Once the system detects the risk of material blockage, the fan frequency will be automatically adjusted to prevent material blockage during the conveying process.

[0057] Due to differences in material properties (such as viscosity, hygroscopicity, fragility, abrasiveness, etc.), the actual production process design layout (horizontal conveying length, vertical height, number of bends) varies. Different system air volume, system pressure, etc. need to be calculated for different material properties and process layouts. However, most calculations are based on engineering experience and lack data support.

[0058] For different material characteristics, this utility model can select different conveying methods (Roots blower conveying, air compressor conveying tank conveying). During the conveying process, parameters (air volume, pressure, conveying capacity, conveying distance (first conveying line or second conveying line)) are collected to form the benchmark conveying data of the conveyed material. Based on this data, the system air volume, system pressure, pipe diameter, etc. required for the layout of new materials and new processes can be flexibly calculated, and then the relevant equipment can be selected.

[0059] This invention improves material conveying efficiency and minimizes material waste through its cyclic conveying function.

[0060] This utility model of pneumatic conveying system can realize the cyclic testing of material performance, and conduct as many experiments as possible while ensuring that the material is not crushed or the crushing rate is extremely small.

[0061] This utility model has two conveying methods: one is conveying by a Roots blower, and the other is conveying by an air compressor sending tank. The two conveying methods share the same conveying pipeline and can be directly switched.

[0062] The Roots blower conveyor uses a variable frequency blower, which can be manually adjusted or adjusted using a pre-developed automatic adjustment program to regulate the airflow, thereby adjusting the material flow characteristics (from dilute phase to semi-dense phase). Simultaneously, pressure sensors on the pipeline collect several parameters during material conveying, such as airflow, pressure, and conveying capacity.

[0063] The above embodiments are only for illustrating the technical features and concept of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made according to the spirit and implementation of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pneumatic conveying device, characterized in that, include: The feeding mechanism can be optionally connected to a blower conveyor mechanism or a feeding tank conveyor mechanism; A shared conveying pipeline mechanism includes a first conveying main pipe and a second conveying main pipe, with a first conveying line and a second conveying line connected in parallel between the first conveying main pipe and the second conveying main pipe; the conveying distance of the second conveying line is greater than that of the first conveying line; the first conveying main pipe can be selectively connected to the discharge port of the blower conveying mechanism or the discharge port of the sending tank conveying mechanism; The dust removal and unloading mechanism is connected to the second conveying main pipe; the outlet of the dust removal and unloading mechanism can be optionally connected to the unloading channel or the circulation channel; the circulation channel can be optionally connected to the fan conveying mechanism or the sending tank conveying mechanism.

2. The pneumatic conveying device according to claim 1, characterized in that, The fan conveying mechanism includes: A feed hopper, wherein an airlock is provided at the bottom of the feed hopper; The feed tee has a feed inlet connected to the airlock; the air inlet of the feed tee is connected to the Roots blower via an air inlet pipe.

3. The pneumatic conveying device according to claim 2, characterized in that, The feed hopper is equipped with a first high material level sensor and a vent cap. An air flow meter and a first pressure sensor are installed on the air intake pipe; The Roots blower is a variable frequency blower. When the real-time pressure value obtained by the first pressure sensor is greater than the set pressure value, the frequency of the Roots blower is increased to increase the air volume and avoid material blockage.

4. The pneumatic conveying device according to claim 1, characterized in that, The shipping tank conveying mechanism includes: The sending tank has a feed valve at its inlet and a main air inlet at its top; the sending tank has a discharge valve, a discharge bend, and a discharge straight pipe arranged sequentially at its outlet; the discharge straight pipe can be connected to the first conveying main pipe. An air storage tank, the air inlet of which is connected to an air compressor via a dryer; the air outlet of which is connected to the main air inlet via a connecting pipe.

5. The pneumatic conveying device according to claim 4, characterized in that, The bottom of the sending tank is provided with a first air inlet evenly distributed around its circumference; A second air inlet is provided horizontally on the discharge bend, and the second air inlet is tangential to the discharge bend. A third air inlet is vertically installed on the discharge straight pipe; The first air inlet, the second air inlet, the third air inlet, and the main air inlet are connected in parallel on the connecting air pipe; A pressure regulating valve is installed on the connecting air pipe.

6. The pneumatic conveying device according to claim 4, characterized in that, A safety valve, a second pressure sensor, and a venting butterfly valve are installed on the top of the sending tank; The sending tank is equipped with a second high level sensor and a low level sensor.

7. The pneumatic conveying device according to claim 1, characterized in that, The first conveying main pipe is equipped with a third pressure sensor and a fourth pressure sensor at its inlet and outlet ends, respectively; a first observation window is provided on the first conveying main pipe. A first reversing valve is installed at the intersection of the first conveying main pipe, the first conveying line, and the second conveying line; A third reversing valve is installed at the intersection of the second conveying main pipe, the first conveying line, and the second conveying line; A second reversing valve is installed on the second conveying line to convey materials to the corresponding silo; A fifth pressure sensor is provided on the second conveying main pipe; a second observation window is provided on the second conveying main pipe; The material conveying distance of the second conveying line is 180m, and the material conveying distance of the first conveying line is 80m.

8. The pneumatic conveying device according to claim 1, characterized in that, The dust removal and unloading mechanism includes: A dust collector unloader is provided, which is equipped with a third high material level sensor and a weighing sensor; a discharge pipe is provided at the discharge port of the dust collector unloader, and a discharge valve is provided on the discharge pipe.

9. The pneumatic conveying device according to claim 8, characterized in that, The discharge pipe is equipped with a gravity reversing valve. By adjusting the direction of the gravity reversing valve, the material can enter the discharge channel or the circulation channel.

10. The pneumatic conveying device according to claim 1, characterized in that, The feeding mechanism includes a feeding station and a feeding pipe. A tee is provided on the feeding pipe, and the tee can be selectively connected to the feeding station and the circulation channel.

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