Anti-blocking vacuum conveying system

Abstract

The invention relates to the field of material conveying, in particular to an anti-blocking type vacuum conveying system which comprises a feeding hopper, a vacuum adapter, a filter, a vacuum conveying pipeline, an annular air knife assembly and a material storage tank which are sequentially communicated, a sectional type sealing cabin is arranged between the vacuum adapter and the filter, and the annular air knife assembly is connected to the middle of the vacuum conveying pipeline. The upper end of the material storage tank is connected with a back flushing assembly, the outlet end of the vacuum conveying pipeline is connected with a reducer pipe structure, an air hammer is arranged at the bottom of the outer side wall of the material storage tank, and the invention further relates to a sealing structure of the sectional type sealing cabin, a gas-solid two-phase flow regulation and control unit in the vacuum conveying pipeline, a programmable airflow path switching device of the back flushing assembly and other structures. The conveying device has the effect of preventing blockage in the material conveying process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material conveying, in particular to an anti-blocking vacuum conveying system. BACKGROUND

[0002] Pipe conveying technology plays a crucial role in industrial production, especially in granulator equipment, and plays a key role in conveying solid materials after drying. With the continuous development of industry, the requirements for the efficiency, quality and hygiene standards of material conveying are becoming higher and higher. An efficient, stable and hygienic conveying system can improve production efficiency, reduce production cost and ensure product quality, which has an important influence on the smooth operation of the entire production process and the economic benefit of the enterprise. In the food, medicine and other high hygiene standard industries, the requirements for material conveying are more stringent. Not only the efficiency of conveying should be ensured, but also the sealing, cleaning and maintenance convenience during conveying should be ensured to avoid material blocking and other problems to meet the special needs of the industry.

[0003] Currently, there are mainly two ways to transport solid materials after drying in granulator equipment. One is vacuum suction conveying, which uses a vacuum pump to generate a negative pressure airflow in the conveying pipeline to suck the material from the granulator discharge port into the temporary storage bin. When the target material level or time is reached, the vacuum is eliminated, and the material is discharged from the bottom of the receiving tank to the next process under the action of gravity. The other is the elevator type mechanical conveying, the material from the granulator enters the hopper or chute of the elevator, and is vertically lifted to the top by the motor drive, and then is turned over at the top to pour the material into the designated receiving bin.

[0004] The efficiency of vacuum suction conveying will decrease when conveying over a long distance and large capacity, and part of the material will adhere to the inner wall of the pipeline to form material accumulation, causing insufficient feeding. At the same time, its cleaning is relatively difficult, and there may be dead angles, which can cause cross contamination of materials. SUMMARY

[0005] In order to prevent blocking during material conveying, the present application provides an anti-blocking vacuum conveying system.

[0006] The present application provides an anti-blocking vacuum conveying system, which adopts the following technical scheme: The anti-blocking vacuum conveying system comprises a feeding hopper, a vacuum adapter, a filter, a vacuum conveying pipeline, an annular air knife assembly and a storage tank connected in sequence, a segmented sealing cabin is arranged between the vacuum adapter and the filter, the annular air knife assembly is connected to the middle part of the vacuum conveying pipeline, a back flushing assembly is connected to the upper end of the storage tank, a reducing pipe structure is connected to the outlet end of the vacuum conveying pipeline, and a pneumatic hammer is arranged at the bottom of the outer wall of the storage tank.

[0007] By adopting the technical scheme, the feeding hopper, the vacuum adapter, the filter, the vacuum transmission pipeline, the annular air knife assembly and the storage tank are sequentially communicated, so that the material can be stably conveyed from the feeding hopper to the storage tank through each component. The segmented sealing cabin arranged between the vacuum adapter and the filter can form a dynamic sealing layer at each module interface by using the magnetic fluid sealing technology, so as to achieve good sealing effect, prevent material leakage and ensure stable operation of the system in a vacuum environment. The annular air knife assembly is connected to the middle part of the vacuum transmission pipeline, compressed air is injected into the pipeline by the air pump, and a pressure difference is formed by cooperating with the internal structure to push the material transportation. After the material is pushed into the cabin, the vacuum breaking effect is achieved, so that the material falls to the bottom of the tank under its own gravity, and the subsequent material flow is ensured. The back flushing assembly connected to the upper end of the storage tank can perform back flushing operation on the storage tank to remove possible blockage. The variable diameter pipe structure connected to the outlet end of the vacuum transmission pipeline can accelerate the material, stabilize the air pressure, reduce the material adhesion and improve the conveying efficiency. The air hammer arranged at the bottom of the outer wall of the storage tank can act when detecting abnormal pressure in the tank, further preventing the material from being blocked in the storage tank, thereby effectively solving the problems of insufficient sealing, difficult cleaning and maintenance and low efficiency caused by material blockage in the traditional vacuum conveying system, and realizing efficient, stable and anti-blocking material conveying.

[0008] Optionally, the segmented sealing cabin includes at least two sealing segments, adjacent sealing segments are connected through quick release flanges, permanent magnet rings and magnetic guide housings are embedded at interfaces of each sealing segment, and a dynamic sealing layer is formed by filling nanoscale magnetic fluid in the sealing cavity to achieve zero leakage at a vacuum degree of-0.1 MPa.

[0009] By adopting the technical scheme, the segmented sealing cabin is composed of at least two sealing segments, adjacent sealing segments are connected through quick release flanges, and the system vacuum environment is not damaged when the sealing segments are individually disassembled, cleaned or replaced. Permanent magnet rings and magnetic guide housings are embedded at interfaces of each sealing segment, and a dynamic sealing layer is formed by injecting nanoscale magnetic fluid, which can achieve zero leakage at a vacuum degree of-0.1 MPa. The technical scheme can effectively solve the problem of insufficient sealing of the traditional vacuum conveying system, improve the sealing reliability and reduce the maintenance time.

[0010] Optionally, the vacuum transmission pipeline is integrated with a gas-solid two-phase flow regulation unit, which includes a Doppler flow velocity sensor, a Venturi regulating valve group and a PID control loop feedback to a controller, and the regulating valve group is arranged downstream of the sensor.

[0011] By adopting the technical scheme, the gas-solid two-phase flow regulation unit is integrated in the vacuum conveying pipeline, the material concentration is monitored in real time by using the Doppler flow sensor, the data is fed back to the PID control loop of the controller, the PID algorithm is used to dynamically adjust the compression air injection angle and pressure of the Venturi adjusting valve group according to the material characteristics, the pressure range is adjusted within the preset range, so that the gas flow speed always matches the material characteristics, the optimal conveying suspension ratio is maintained, the gas-solid matching is realized, the conveying efficiency is improved, and the blockage rate is reduced.

[0012] Optionally, the back flushing assembly is connected with a programmable air flow path switching device, the switching device includes a three-way reversing valve group and a pressure buffer tank, the reversing valve group is in communication with the annular air knife assembly and an external compressed air source, and is used for triggering the positive and negative pressure alternating circulation in the cleaning mode.

[0013] By adopting the technical scheme, in the cleaning mode, the three-way reversing valve group in the programmable air flow path switching device cooperates with the pressure buffer tank, so that the positive and negative pressure alternating circulation can be triggered, the pressure in the positive pressure stage drives the air flow of the annular air knife assembly, the material accumulated on the wall of the vacuum conveying pipeline is effectively stripped, the debris stripped off is sucked into the collector in the negative pressure stage, the whole cleaning process does not need to stop, the residual on the wall can be removed, the cleaning efficiency and the hygiene standard of the conveying system are improved, and the continuous and stable operation of the system is maintained.

[0014] Optionally, a low-friction coating is arranged on the inner wall of the variable-diameter pipe, and the surface of the coating has hydrophobic and oleophobic properties.

[0015] By adopting the technical scheme, the variable-diameter pipe is provided with the coating having the hydrophobic and oleophobic properties, the adhesion of the material to the inner wall of the variable-diameter pipe is reduced, the flow resistance of the material in the variable-diameter pipe is reduced, the material can pass through the variable-diameter pipe more smoothly, the material is effectively prevented from being blocked at the variable-diameter pipe, and the stable operation of the whole anti-blocking vacuum conveying system is ensured, and the conveying efficiency is improved.

[0016] Optionally, the quick-release flange includes a buckle type positioning flange and a sealing gasket, a guide groove and a limiting pin cooperation structure are arranged on the flange connecting end face, the quick-release flange and the flange of the vacuum conveying pipeline are radially positioned by using the coaxial positioning pin and the elastic positioning ring, and the flange connecting face adopts a zigzag sealing groove structure.

[0017] By adopting the technical scheme, the quick-release flange adopts the buckle type positioning flange and sealing gasket, and the guide groove and the limiting pin cooperation structure are arranged on the flange connecting end face, the buckle type positioning flange can quickly realize the positioning and connection of the flange, improve the installation efficiency, the sealing gasket can enhance the sealing property of the flange connection, prevent material leakage, and the guide groove and the limiting pin cooperation structure can further ensure the accuracy and stability of the flange connection, so that when each module is connected through the quick-release flange, the modules can be individually disassembled, cleaned or replaced without damaging the system vacuum environment, and the system can be conveniently maintained and cleaned. The quick-release flange of the sealed cabin and the flange of the vacuum transmission pipeline are radially positioned by using the coaxial positioning pin and the elastic positioning ring, so that the two can be accurately aligned during installation, the installation accuracy and stability are improved, and the connection between the sealed cabin and the vacuum transmission pipeline is more stable and reliable. Meanwhile, the flange connecting surface adopts a zigzag type sealing groove structure, and the special structure can increase the sealing contact area and effectively prevent gas or material leakage.

[0018] Optionally, the back flushing assembly comprises a gas pocket and a vacuum back flushing device, and the vacuum back flushing device is in communication with the inside of the storage tank through a corrugated hose.

[0019] By adopting the technical scheme, the gas pocket in the back flushing assembly can store compressed gas to provide a gas source guarantee for back flushing operation. When back flushing operation is needed, the vacuum back flushing device can deliver the compressed gas in the gas pocket to the inside of the storage tank through the corrugated hose to back flush the inside of the storage tank. In this way, material accumulation and clogging at the inlet of the storage tank can be effectively prevented, the smooth entry of the material into the storage tank is ensured, and the cleaning of the inlet is also facilitated, so that the normal operation and good working condition of the system are maintained.

[0020] Optionally, a pressure sensor is arranged in the storage tank, and the air hammer is in signal connection with the pressure sensor.

[0021] By adopting the technical scheme, the air hammer arranged at the bottom of the outer wall of the storage tank is in signal connection with the pressure sensor in the tank, and when the pressure sensor detects abnormal changes in the pressure in the storage tank, the signal can be immediately transmitted to the air hammer. The air hammer is started in time according to the received signal to knock the outer wall of the storage tank, effectively preventing the accumulation and caking of the material at the bottom of the storage tank, ensuring that the material can be smoothly discharged from the storage tank, ensuring the smooth operation of the entire conveying system, further improving the conveying efficiency, and reducing the risk of system failure caused by material clogging.

[0022] In summary, the present application has at least one of the following beneficial technical effects: 1. The feeding hopper, vacuum adapter, filter, vacuum transmission pipeline, annular air knife assembly and storage tank are sequentially connected, which can enable the material to be stably transported from the feeding hopper to the storage tank through each component. The segmented sealing cabin arranged between the vacuum adapter and the filter can form a dynamic sealing layer at the interface of each module by using the magnetic fluid sealing technology, so as to achieve good sealing effect, prevent material leakage and ensure stable operation of the system in a vacuum environment. The annular air knife assembly is connected to the middle part of the vacuum transmission pipeline, compressed air is injected into the pipeline through the air pump, and a pressure difference is formed in cooperation with the internal structure to push the material transportation, and after pushing the material into the cabin, the air knife assembly plays a role in breaking the vacuum, so that the material falls to the bottom of the bin under its own gravity, ensuring the follow-up material flow. The blowback assembly connected to the upper end of the storage tank can perform blowback operation on the storage tank to remove possible blockage. The variable diameter pipe structure connected to the outlet end of the vacuum transmission pipeline can accelerate the material, stabilize the air pressure, reduce the adhesion of the material and improve the conveying efficiency. The air hammer arranged at the bottom of the outer wall of the storage tank can act when detecting abnormal pressure in the tank, further preventing the material from being blocked in the storage tank, thereby effectively solving the problems of insufficient sealing, difficult cleaning and maintenance, and low efficiency caused by material blockage in the traditional vacuum conveying system, and realizing efficient, stable and anti-blocking material conveying. 2. The segmented sealing cabin is composed of at least two sealing segments, and adjacent sealing segments are connected through quick-release flanges, which facilitates separate disassembly, cleaning or replacement without damaging the vacuum environment of the system. Permanent magnet rings and magnetically conductive shells are embedded at the interfaces of each sealing segment, and nanoscale magnetic fluid is injected to form a dynamic sealing layer, which can achieve zero leakage under a vacuum degree of-0.1 MPa, effectively solving the problem of insufficient sealing of the traditional vacuum conveying system, improving the sealing reliability and reducing the maintenance time. 3. The gas-solid two-phase flow regulation unit is integrated in the vacuum transmission pipeline, the Doppler flow velocity sensor is used to monitor the material concentration in real time, the data is fed back to the PID control loop of the controller, and the PID algorithm dynamically adjusts the injection angle and pressure of the compressed air of the Venturi adjusting valve group according to the material characteristics, so that the pressure range is adjusted within the preset range, so that the gas flow velocity always matches the material characteristics, maintains the optimal conveying suspension ratio, realizes the matching of gas and solid, improves the conveying efficiency, and reduces the blockage rate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure diagram of the anti-blocking vacuum conveying system.

[0024] Figure 2 It is the structure diagram of the annular air knife assembly and the three-way reversing valve group.

[0025] Figure 3 It is the structure diagram of the quick-release flange.

[0026] Figure 4 It is the structure diagram of the quick-release flange when it is separated.

[0027] BRIEF DESCRIPTION OF DRAWINGS 1, feed hopper; 2, vacuum adapter; 3, filter; 4, vacuum transmission pipeline; 5, annular air knife assembly; 51, reducing pipe; 6, storage tank; 61, air hammer; 7, sectional sealing cabin; 71, quick-release flange; 711, buckle-type positioning flange; 712, sealing gasket; 713, guide groove; 714, limit pin; 715, positioning pin; 716, elastic positioning ring; 72, permanent magnet ring; 73, magnetic guide shell 8, back flushing assembly; 81, air pocket; 82, vacuum back flusher; 9, switching device; 91, three-way reversing valve group; 92, pressure buffer tank. DETAILED DESCRIPTION

[0028] The application will be further described in detail below with reference to all the drawings.

[0029] The application discloses a non-blocking vacuum conveying system.

[0030] REFERENCE Figure 1 The non-blocking vacuum conveying system comprises a feed hopper 1, a vacuum adapter 2, a filter 3, a vacuum transmission pipeline 4, an annular air knife assembly 5 and a storage tank 6 which are sequentially connected, wherein the vacuum adapter 2 is connected at the outlet of the feed hopper 1, the filter 3 is connected after the vacuum adapter 2, the annular air knife assembly 5 is connected to the middle part of the vacuum transmission pipeline 4, and the storage tank 6 is connected at the end of the vacuum transmission pipeline 4. Such a connection mode forms a complete material conveying channel, material enters from the feed hopper 1, passes through a series of components and finally reaches the storage tank 6, and the conveying of the material is realized. A sectional sealing cabin 7 is arranged between the vacuum adapter 2 and the filter 3, a back flushing assembly 8 is connected to the upper end of the storage tank 6, a reducing pipe 51 structure is connected to the outlet end of the vacuum transmission pipeline 4, and an air hammer 61 is arranged at the bottom of the outer side wall of the storage tank 6. The arrangement of these components further optimizes the performance of the conveying system and solves the problems of poor sealing, difficult cleaning and maintenance, low efficiency caused by material blockage and the like of the traditional conveying system.

[0031] REFERENCE Figure 1 Specifically, the feed hopper 1 is the inlet of the conveying system, and its shape can be funnel-shaped, facilitating the gathering and flowing of the material. The material of the feed hopper 1 can be stainless steel, which has good corrosion resistance and strength. It can be connected with the vacuum adapter 2 through welding or bolt connection, to ensure the sealing and stability of the connection.

[0032] REFERENCE Figure 1 The vacuum adapter 2 is used to connect the feed hopper 1 with the subsequent filter 3, and can also play a certain buffering and adjusting role. It can be made of metal material, such as aluminum alloy, which is light in weight and high in strength. The connection of the vacuum adapter 2 with the feed hopper 1 and the filter 3 can adopt flange connection, which is convenient for installation and disassembly.

[0033] Referring to Figure 1 , the filter 3 is provided with a butterfly valve which can control the flow and cut-off of the material. The filter 3 filters the impurities and dust in the material to ensure the purity of the material entering the subsequent pipeline. A filter element can be arranged inside. The material of the filter element can be paper, cotton or metal wire mesh, etc. When the filter 3 needs to be cleaned, the butterfly valve can be opened for operation.

[0034] Referring to Figure 1 , the segmented sealing cabin 7 includes at least two sealing segments, and adjacent sealing segments are connected through quick-release flanges 71. Permanent magnet rings 72 and magnetic guide housings 73 are embedded at the interfaces of the sealing segments, and the sealing cavities are filled with nanoscale magnetic fluid to form a dynamic sealing layer. The permanent magnet rings 72 can be made of neodymium-iron-boron permanent magnet material, which has strong magnetism. The magnetic guide housings 73 can be made of soft magnetic material, such as silicon steel sheet. The nanoscale magnetic fluid has good fluidity and magnetism, and can be attached to the sealing interface under the action of the permanent magnet ring 72 to form a reliable seal. This segmented sealing cabin 7 realizes zero leakage when the vacuum degree is-0.1 MPa, greatly improving the sealing performance of the conveying system.

[0035] Referring to Figure 1 and Figure 2 , the annular air knife is provided with two air ports, and the two air ports are connected with the same air inlet pipe. The annular air knife is connected with variable diameter pipes 51 at both ends, and the variable diameter pipes 51 gradually increase in diameter along the direction close to the annular air knife. The annular air knife can generate high-speed annular airflow to blow off the material on the inner wall of the pipeline to prevent the material from being blocked. The air inlet pipe can be connected with a compressed air source to provide air source for the annular air knife. The structure of the variable diameter pipe 51 includes a converging section, an equal diameter section and a diverging section. The converging section forms a 30° taper angle, the diverging section forms a 15° taper angle, and the length of the equal diameter section is greater than or equal to three times the diameter of the variable diameter pipe 51. This double curvature converging-diverging design can accelerate the material at the 30° taper angle of the inlet section. Specifically, because of the existence of the taper angle, the cross-sectional area of the pipeline gradually decreases, and according to the principle of fluid mechanics, the flow rate will increase accordingly; the equal diameter section in the middle can stabilize the flow rate of the material to avoid excessive fluctuation of the flow rate; the 15° expansion angle at the outlet section can stabilize the air pressure to make the material enter the subsequent pipeline smoothly. The inner wall of the variable diameter pipe 51 is provided with a low-friction coating, the surface of the coating has hydrophobic and oleophobic properties and the friction coefficient is less than or equal to 0.04, and the thickness of the coating is 50 microns, such as polytetrafluoroethylene coating, which reduces the adhesion of the material to the pipe wall and further prevents the material from being blocked.

[0036] Referring to Figure 3 and Figure 4The quick-release flange 71 includes a buckle-type positioning flange 711 and a sealing gasket 712. The flange connecting end face is provided with a guide groove 713 and a limiting pin 714 cooperation structure. Specifically, the guide groove 713 is in a strip shape and is arranged on the flange connecting end face. The limiting pin 714 is fixed in the corresponding position. When the two flanges are butted, the limiting pin 714 is accurately inserted into the guide groove 713, thereby playing a positioning role, facilitating quick connection and disconnection of the sealing section, and ensuring the accuracy and sealing performance of the connection. The quick-release flange 71 of the sealing cabin and the flange of the vacuum conveying pipeline 4 are radially positioned through a coaxial positioning pin 715 and an elastic positioning ring 716. The coaxial positioning pin 715 is in a cylindrical shape, and its diameter is matched with the corresponding pin hole of the quick-release flange 71 and the flange of the vacuum conveying pipeline 4. The elastic positioning ring 716 is an annular ring made of rubber, which is sleeved around the pin hole and plays a buffering and sealing role. The flange connecting face adopts a zigzag sealing groove structure. This structure forms multiple zigzag channels in the sealing groove, increases the leakage resistance, and further enhances the sealing effect.

[0037] Referring to Figure 1 The vacuum conveying pipeline 4 is the main channel for material conveying, and its material can be selected from high-strength plastic or metal pipeline. The vacuum conveying pipeline 4 is integrated with a gas-solid two-phase flow regulation unit, including a Doppler flow rate sensor, a Venturi regulating valve group, and a PID control loop feedback to the controller. The Doppler flow rate sensor can monitor the flow rate and concentration of the material in real time. Its working principle is to use the Doppler effect to measure the movement speed of the material by emitting and receiving ultrasonic waves. The Venturi regulating valve group is arranged downstream of the sensor. It can dynamically adjust the injection angle and pressure of compressed air through the PID algorithm according to the feedback information of the sensor, and the pressure range is 0.2 to 0.8 MPa. Specifically, when the sensor detects that the material concentration is high, the Venturi regulating valve group increases the injection pressure of compressed air to increase the airflow speed and make the material better suspended in the airflow. When the material concentration is low, the pressure is appropriately reduced to avoid energy waste. In this way, the airflow speed can always match the material characteristics, maintain the optimal conveying suspension ratio, and improve the conveying efficiency of the material.

[0038] Referring to Figure 1The material storage tank 6 is used for storing the conveyed material, and the material of the material storage tank 6 can be selected from stainless steel. The back flushing assembly 8 connected to the upper end of the material storage tank 6 includes an air pocket 81 and a vacuum back flushing device 82. The vacuum back flushing device 82 is communicated with a pneumatic ball valve at the material inlet of the material storage tank 6 through a corrugated hose. The air pocket 81 can store compressed air. When the back flushing operation is needed, the compressed air enters the material storage tank 6 through the vacuum back flushing device 82 to clean the residual material in the material storage tank 6. The pneumatic ball valve can control the feeding and back flushing operation of the material storage tank 6. The air hammer 61 is arranged at the bottom of the outer side wall of the material storage tank 6 and is connected with the pressure sensor in the material storage tank 6. When the pressure sensor detects that the pressure in the material storage tank 6 is abnormal or that the material is accumulated, the air hammer 61 is started to loosen the material by knocking the outer side wall of the material storage tank 6, so that the material is prevented from being blocked. The back flushing assembly 8 is connected with the programmable air flow path switching device 9. The switching device 9 includes a three-way reversing valve group 91 and a pressure buffer tank 92. The reversing valve group is communicated with the annular air knife assembly 5 and an external compressed air source. In the cleaning mode, the three-way reversing valve group 91 is switched according to the set program to trigger the positive and negative pressure alternating circulation with an alternating frequency of 0.5 Hz. The pressure in the positive pressure stage is +0.05 MPa. At this time, the compressed air generates a strong air flow through the annular air knife to push the annular air knife air flow to strip the accumulated material on the pipe wall. The pressure in the negative pressure stage is-0.08 MPa. The debris is sucked into the collector. The whole process does not need to stop.

[0039] The implementation principle of the anti-blocking vacuum conveying system in the embodiment of the present application is that the feeding hopper 1, the vacuum adapter 2, the filter 3, the vacuum transmission pipeline 4, the annular air knife assembly 5 and the material storage tank 6 are sequentially communicated, so that the material can be stably conveyed from the feeding hopper 1 to the material storage tank 6 through each assembly. The segmented sealing cabin 7 arranged between the vacuum adapter 2 and the filter 3 can form a dynamic sealing layer at each module interface by using the magnetic fluid sealing technology, so that a good sealing effect is achieved, the material leakage is prevented, and the stable operation of the system in the vacuum environment is ensured. The annular air knife assembly 5 is connected to the middle part of the vacuum transmission pipeline 4. The compressed air is injected into the pipeline through the air pump to form an air pressure difference with the internal structure, so as to push the material transportation. After the material is pushed into the cabin, the air knife assembly 5 plays a role in breaking the vacuum, so that the material falls to the bottom of the tank under the action of its own gravity, and the subsequent material flow is ensured. The back flushing assembly 8 connected to the upper end of the material storage tank 6 can perform the back flushing operation on the material storage tank 6 to clean the possible blockage. The variable diameter pipe 51 structure connected to the outlet end of the vacuum transmission pipeline 4 can accelerate the material, stabilize the air pressure, reduce the material adhesion and improve the conveying efficiency. The air hammer 61 arranged at the bottom of the outer side wall of the material storage tank 6 can be actuated when the abnormal pressure in the tank is detected, so as to further prevent the material from being blocked in the material storage tank 6. Therefore, the problems of low efficiency caused by the insufficient sealing performance, the difficult cleaning and maintenance and the material blockage of the traditional vacuum conveying system are effectively solved as a whole, and the high-efficiency, stable and anti-blocking material conveying is realized.

[0040] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. An anti-blocking vacuum conveying system, characterized in that: The system includes a feed hopper (1), a vacuum adapter (2), a filter (3), a vacuum transmission pipeline (4), an annular air knife assembly (5), and a storage tank (6) connected in sequence. A segmented sealed chamber (7) is provided between the vacuum adapter (2) and the filter (3). The annular air knife assembly (5) is connected to the middle of the vacuum transmission pipeline (4). A backflush assembly (8) is connected to the upper end of the storage tank (6). A reducer (51) structure is connected to the outlet end of the vacuum transmission pipeline (4). An air hammer (61) is provided at the bottom of the outer wall of the storage tank (6).

2. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The segmented sealed chamber (7) includes at least two sealing sections. Adjacent sealing sections are connected by quick-release flanges (71). A permanent magnet ring (72) and a magnetic shell (73) are embedded at the interface of each sealing section. The sealed cavity is filled with nanoscale magnetic fluid to form a dynamic sealing layer, achieving zero leakage at a vacuum level of -0.1 MPa.

3. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The vacuum transmission pipeline (4) integrates a gas-solid two-phase flow control unit, including a Doppler flow velocity sensor, a Venturi regulating valve group, and a PID control loop that feeds back to the controller. The regulating valve group is located downstream of the sensor.

4. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The backflush assembly (8) is connected to a programmable airflow path switching device (9). The switching device (9) includes a three-way reversing valve assembly (91) and a pressure buffer tank (92). The reversing valve assembly is connected to the annular air knife assembly (5) and an external compressed air source to trigger positive and negative pressure alternation in the cleaning mode.

5. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The inner wall of the reducing pipe (51) is provided with a low-friction coating, and the coating surface has hydrophobic and oleophobic properties.

6. The anti-blocking vacuum conveying system according to claim 2, characterized in that: The quick-release flange (71) includes a snap-fit ​​positioning flange (711) and a sealing gasket (712). The connecting end face of the quick-release flange (71) is provided with a guide groove (713) and a limiting pin (714) cooperating structure. The quick-release flange (71) and the flange of the vacuum transmission pipeline (4) are radially positioned by a coaxial positioning pin (715) and an elastic positioning ring (716). The flange connection surface adopts a sawtooth sealing groove structure.

7. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The backflush assembly (8) includes an air tank (81) and a vacuum backflush device (82), which is connected to the inside of the storage tank (6) via a corrugated hose.

8. The anti-blocking vacuum conveying system according to claim 1, characterized in that: The storage tank (6) is equipped with a pressure sensor, and the air hammer (61) is connected to the pressure sensor signal.

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