Self-cleaning type blowback recovery device for jet mill

Abstract

The invention relates to the technical field of jet mills, in particular to a self-cleaning type reverse blowing recovery device for a jet mill, which comprises a vertically arranged shell, a filter unit, a partition plate, a lifting rod, a lifting block, a filter element, a discharge unit and a blowing unit, the partition plate is horizontally and fixedly arranged in the shell and divides the shell into an upper cavity and a lower cavity, and a circular opening is formed in the partition plate; the lifting rod is vertically and movably arranged on the circular opening; the lifting block is fixedly arranged on the lifting rod and is of an annular structure, and the outer diameter of the lifting block is smaller than the diameter of the circular opening; the filter element is of a funnel-shaped structure, the larger end of a filter element port is fixedly connected with the circular opening, and the smaller end of the filter element port is fixedly connected with the lifting block; the discharge unit is arranged at the lower part of the lifting rod; the blowing unit is arranged at the upper part of the circular opening. According to the device, the filter element can be synchronously cleaned while the jet mill continuously runs, and the cleaning speed and the cleaning effect of the filter element can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of air jet milling technology, and more specifically to a self-cleaning backflushing recovery device for air jet mills. Background Technology

[0002] In existing technologies, after pulverizing, the air jet mill needs to convey the pulverized solid powder to a powder cyclone collector. Most of the powder is discharged from the bottom of the cyclone collector, while some extremely fine particles rise with the airflow. A filter element is installed at the top of the cyclone collector to intercept the rising extremely fine dust particles. However, prolonged use can easily lead to filter element clogging. This clogging not only requires regular maintenance and cleaning but may also involve filter element replacement, increasing costs and maintenance workload, further reducing equipment production efficiency, and failing to effectively solve the filter element clogging problem and improve the equipment's continuous operating capability.

[0003] Chinese Patent Publication No. CN221063766U discloses a dust recovery and backflushing device for an airflow pulverizer, including a support frame. An airflow pulverizer is fixedly installed at one top end of the support frame, and a dust collection bin is fixedly installed at the other top end of the support frame. A dust suction pipe is fixedly installed on one side arc surface of the dust collection bin. The inlet end of the dust suction pipe is fixedly installed to the exhaust end of the airflow pulverizer. A filtration and recovery mechanism is provided inside the dust collection bin, and a backflushing device is provided on the top of the filtration and recovery mechanism. The filtration and recovery mechanism enables the dust collection bin to recover and filter the dust inside the airflow pulverizer, and the backflushing device prevents the dust filtered inside the filtration and recovery mechanism from being adsorbed.

[0004] The above-mentioned solution achieves self-cleaning of the filter element through backflushing. However, during backflushing, the filter element in the integrated tank cannot perform normal filtration, requiring the air jet mill to be stopped during backflushing cleaning. Otherwise, the backflushing gas cannot be discharged properly, thus affecting the pulverizing efficiency. If half of the filter element is in backflushing mode while the other half is in filtration mode, the filter element in backflushing mode is still in a dusty environment, and there is bidirectional airflow near the filter element, resulting in poor backflushing effect. Existing air jet mill filter elements, in addition to self-cleaning through backflushing, can also shake the filter element to make the dust adhering to it fall off. However, under the action of airflow, although the dust adhering to the filter element can leave the filter element surface when the filter element is shaken, it will quickly re-adhere to the filter element. Although the air jet mill does not need to be stopped, the self-cleaning effect of the filter element is poor. Summary of the Invention

[0005] To address the aforementioned issues, a self-cleaning backflushing recovery device for an airflow pulverizer is provided. This device divides the housing into an upper and lower chamber by a partition. A circular opening is provided on the partition, and a vertically movable lifting rod is mounted on this opening. The two ends of the filter element are positioned on the circular opening and the lifting rod, respectively. When the filter element is in filtration mode, it is located in the lower chamber. When in self-cleaning mode, it is located in the upper chamber, and the discharge unit contacts the lower part of the partition. This prevents the filter element in self-cleaning mode from contacting the lower chamber, ensuring that the airflow in the lower chamber does not affect the filter element in self-cleaning mode. This guarantees that the airflow from the blowing unit is not disturbed by the rising airflow in the lower chamber, thus ensuring that during backflushing cleaning, the airflow can continuously and comprehensively penetrate the filter element in one direction. This allows for the rapid removal of extremely fine dust adhering to the filter element, which is then discharged through the discharge unit.

[0006] To address the problems of the prior art, the present invention provides a self-cleaning backflush recovery device for an airflow pulverizer. The backflush recovery device includes a vertically arranged housing, and the filtration unit further includes a partition, a lifting rod, a lifting block, a filter element, a discharge unit, and an air blowing unit. The partition is horizontally fixed in the shell and divides the shell into an upper cavity and a lower cavity for containing dust. Multiple circular openings are provided on the partition. The lifting boom is vertically movable and positioned on the circular opening; The lifting block is fixedly mounted on the lifting rod. The lifting block has a ring structure, and the outer diameter of the lifting block is smaller than the diameter of the circular opening. The filter element has a funnel-shaped structure. The larger end of the filter element is fixedly connected to the circular opening, and the smaller end of the filter element is fixedly connected to the outer periphery of the lifting block. When the lifting rod moves up and down, the filter element can extend into the upper or lower cavity. When the filter element is in the upper cavity, it is in a self-cleaning state, and when the filter element is in the lower cavity, it is in a filtering state. The discharge unit is located at the bottom of the lifting rod. When the filter element is in self-cleaning mode, the discharge unit contacts the bottom of the baffle and is used to discharge the dust cleaned off the filter element. The air blowing unit is located at the top of the circular opening, and it blows air onto the filter element that enters the upper cavity.

[0007] Preferably, the air blowing unit includes a housing and an air blowing pipe; The casing is vertically fixed at the top of the circular opening, forming a sealed cavity above the circular opening; The air blowing pipe is arranged around the casing and can blow air into the casing.

[0008] Preferably, the filter unit further includes an exhaust duct, an exhaust pipe, a first switching valve, and a bellows; The exhaust vent is vertically located at the top of the lifting rod and communicates with the inside of the housing; The exhaust pipe is located at the top of the casing; The first switching valve is located on the exhaust pipe; The corrugated pipe is vertically installed between the lifting rod and the exhaust pipe, with both ends of the corrugated pipe fixedly connected to the lifting rod and the exhaust pipe, respectively.

[0009] Preferably, the filter unit further includes a drive unit for driving the lifting rod to rise and fall, the drive unit including a rotary driver, a lead screw and a transmission assembly; The rotary actuator is vertically mounted on top of the housing; The lead screw is vertically rotatable and is fixedly connected to the output end of the rotary actuator. The transmission assembly is mounted on the lifting rod, and the lead screw passes vertically through the transmission assembly and is threaded into the transmission assembly.

[0010] Preferably, the transmission assembly includes a lifting plate; The lifting plate is fitted onto the lifting rod, and the lead screw passes through the lifting plate and is threaded into the lifting plate, so that the lifting rod can rise and fall synchronously with the lifting plate.

[0011] Preferably, the transmission assembly further includes a fixed plate, an extension rod, a limiting block, and a spring; The fixing plate is fixedly installed on the lifting rod and located below the lifting plate; The extension rod is vertically fixed on the fixed plate and passes through the lifting plate, with the extension rod slidingly engaged with the lifting plate. The limiting block is fixedly installed at the upper end of the extension rod and is used to limit the lifting plate. The spring is positioned between the fixed plate and the lifting plate along the extension direction of the extension rod, with both ends of the spring fixedly connected to the fixed plate and the lifting plate, respectively.

[0012] Preferably, a groove is provided on the side wall of the lifting rod, and the lifting plate extends into the groove and slides in cooperation with the groove. When the lifting plate is at the lower end of the groove, the spring is in an unstretched state.

[0013] Preferably, the discharge unit includes a discharge hopper, a dust removal unit, a discharge pipe, and a second switching valve; The discharge hopper is fixedly installed at the bottom of the lifting rod, and the discharge hopper has a funnel-shaped structure; The dust removal unit is located on one side of the discharge hopper; The two ends of the discharge pipe are connected to the lower part of the discharge hopper and the dust removal unit, respectively; The second switching valve is installed on the discharge pipe.

[0014] Preferably, the dust removal unit includes a dust removal housing, a sponge, an atomizer, and an extension tube; The dust collector housing is fixedly installed at the bottom of the partition; The sponge is horizontally placed in the dust collector housing, and the lower part of the sponge forms a filter chamber with the dust collector housing; The atomizer is located on the side wall of the filter chamber; The extension pipe is vertically installed at the top of the dust collector housing and passes through the partition.

[0015] Preferably, the dust removal unit also includes an extension head and a dust discharge port; The extension head is vertically positioned at the bottom of the dust collector housing; The ash discharge port is located on the extension head and faces vertically downwards.

[0016] The advantages of this invention compared to the prior art are: 1. This invention uses a partition in the housing to divide the housing into an upper cavity and a lower cavity. A circular opening is provided on the partition, and a lifting rod is vertically movable on the opening. The two ends of the filter element are respectively positioned on the circular opening and the lifting rod. When the filter element is in filtration mode, it is in the lower cavity; when in self-cleaning mode, it is in the upper cavity. At this time, the discharge unit contacts the lower part of the partition, ensuring that the filter element in self-cleaning mode is no longer in contact with the lower cavity. The airflow in the lower cavity will not affect the filter element in self-cleaning mode, ensuring that the airflow from the blowing unit is not disturbed by the rising airflow in the lower cavity. This ensures that when the filter element is backflushed for cleaning, the airflow can continuously and comprehensively penetrate the filter element in one direction, allowing the extremely fine dust adhering to the filter element to be quickly cleaned and discharged through the discharge unit. This achieves simultaneous cleaning of the filter element while the airflow pulverizer is continuously running, while also ensuring the cleaning speed and effectiveness.

[0017] 2. When the lifting rod raises the filter element into the upper cavity, the end with the larger opening of the filter element is located below the end with the smaller opening, and the discharge unit is in contact with the upper part of the partition. This isolates the filter element entering the upper cavity from the lower cavity. At the same time, by setting a shell on the circular opening and setting an air blowing pipe on the shell to blow air into the shell, the airflow blown out by the air blowing pipe is inside the shell rather than in the entire upper cavity, reducing the dispersion of the airflow blown out by the air blowing pipe. At this time, the airflow in the lower cavity cannot affect the filter element being cleaned, so the airflow direction through the filter element remains unchanged. This ensures that the dust attached to the filter element is quickly blown off by the airflow, further improving the backflushing effect.

[0018] 3. By setting a spring between the lifting plate and the fixed plate, the spring provides pressure to the discharge unit, ensuring that the discharge unit can be pressed tightly against the partition after contacting it, thus ensuring complete isolation between the filter element and the lower cavity. At the same time, a sliding groove is also provided on the lifting rod. When the filter element is in the filtering state, the lifting plate directly contacts the sliding groove, so that the spring remains in the restoring state when the filter element is in the filtering state, extending the service life of the spring. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention.

[0020] Figure 2 This is a side view of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention.

[0021] Figure 3 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 2 Schematic diagram of cross-section at point AA.

[0022] Figure 4 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 3 A magnified view of a portion of point B in the middle.

[0023] Figure 5 This is a cross-sectional perspective view of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention.

[0024] Figure 6 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 5 A magnified view of a portion of point C.

[0025] Figure 7 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 5 A magnified view of a portion of point D.

[0026] Figure 8 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 5 A magnified view of a portion of point E in the middle.

[0027] Figure 9 This invention relates to a self-cleaning backflushing recovery device for an airflow pulverizer. Figure 5 A magnified view of a portion of point F in the middle.

[0028] Figure 10 This is a cross-sectional three-dimensional schematic diagram of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention after the shell has been removed.

[0029] Figure 11 This is a three-dimensional schematic diagram of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention after the shell has been removed.

[0030] Figure 12 This is a cross-sectional perspective view of the self-cleaning backflushing recovery device for the airflow pulverizer of the present invention after the shell and discharge unit have been removed.

[0031] The diagram is labeled as follows: 1. Shell; 11. Partition; 111. Circular opening; 12. Lifting rod; 121. Lifting block; 122. Exhaust trough; 123. Exhaust pipe; 124. First switching valve; 125. Bellows; 13. Filter element; 14. Discharge unit; 141. Discharge hopper; 142. Dust removal unit; 1421. Dust removal shell; 1422. Sponge; 1423. Atomizer; 1424. Extension tube; 14 25. Extension head; 1426. Ash discharge port; 143. Discharge pipe; 144. Second switch valve; 15. Air blowing unit; 151. Housing; 152. Air blowing pipe; 16. Drive unit; 161. Rotary driver; 162. Lead screw; 163. Transmission assembly; 1631. Lifting plate; 1632. Fixing plate; 1633. Extension rod; 1634. Limiting block; 1635. Spring; 1636. Slide groove. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1-3 , Figure 5 and Figure 11 A self-cleaning backflush recovery device for an airflow pulverizer includes a vertically arranged housing 1, and the filter unit also includes a partition 11, a lifting rod 12, a lifting block 121, a filter element 13, a discharge unit 14, and an air blowing unit 15. The partition 11 is horizontally fixed in the housing 1 and divides the housing 1 into an upper cavity and a lower cavity for containing dust. Multiple circular openings 111 are provided on the partition 11. The lifting rod 12 is vertically movable and positioned on the circular opening 111; The lifting block 121 is fixedly mounted on the lifting rod 12. The lifting block 121 has a ring structure and the outer diameter of the lifting block 121 is smaller than the diameter of the circular opening 111. The filter element 13 has a funnel-shaped structure. The larger end of the filter element 13 is fixedly connected to the circular opening 111, and the smaller end of the filter element 13 is fixedly connected to the outer periphery of the lifting block 121. When the lifting rod 12 is raised or lowered, the filter element 13 can extend into the upper cavity or the lower cavity. When the filter element 13 is in the upper cavity, the filter element 13 is in a self-cleaning state. When the filter element 13 is in the lower cavity, the filter element 13 is in a filtering state. The discharge unit 14 is located at the lower part of the lifting rod 12. When the filter element 13 is in the self-cleaning state, the discharge unit 14 contacts the lower part of the partition plate 11 and is used to discharge the dust cleaned off the filter element 13. The air blowing unit 15 is located above the circular opening 111, and the air blowing unit 15 blows air onto the filter element 13 that enters the upper cavity.

[0034] An air jet mill uses a high-speed airflow to propel materials, causing them to flow at high speed. During this flow, the materials collide with each other, gradually pulverizing them. Compared to traditional material pulverizing equipment, this method offers better pulverization results. The air jet mill mainly consists of a pulverizing unit, a screening unit, a filtration unit, and an exhaust gas treatment unit. After being pulverized by the pulverizing unit, the material is screened by the screening unit. Material that meets the particle size requirements is removed, while material that does not meet the size requirements is returned to the pulverizing unit for secondary pulverization. Because the pulverizing unit utilizes a continuously supplied high-speed airflow to pulverize the material, the airflow... When the material is discharged from the crushing unit into the screening unit, it enters the filtration unit from the top of the screening unit. The screening unit mainly uses a cyclone separator for screening and separation. Some extremely fine dust will enter the filtration unit with the airflow. The main function of the filtration unit is to separate the extremely fine dust from the airflow, ensuring that the filtered airflow does not contain extremely fine dust. The airflow discharged from the filtration unit also needs to be treated by the exhaust gas treatment unit. This is because when the material is crushed by high-speed airflow, the material will generate high temperature under high-speed collision, and at the same time, harmful volatile gases and combustion residue gases will be generated. If directly discharged, it will cause great environmental pollution. Existing filter units require cleaning of the filter element 13 after filtering extremely fine dust for a period of time, and in most cases, the filter element 13 needs to be removed for cleaning. In order to reduce the workload, existing technologies use a self-cleaning back-flushing recovery device in the filter unit to back-flush the extremely fine dust attached to the filter element 13. However, during the back-flushing of the filter element 13, the air jet mill cannot operate normally because the airflow in the milling unit cannot be discharged normally. If only a single filter element 13 is back-flushed, the air jet mill will be in a continuous state of operation, resulting in poor cleaning effect of the filter element 13. This is because when the air jet mill is running, the filter element 13 being cleaned is not isolated, and a small amount of extremely fine dust remains floating on one side of the filter element 13 with attached extremely fine dust. At the same time, the back-flushing airflow and the airflow entering the filter unit will collide with each other, making it impossible to ensure that the airflow can continuously and comprehensively pass through the filter element 13 during back-flushing. The cleaning time is long and the cleaning effect is poor.

[0035] To avoid the above situation, the present invention redesigns the existing backflushing recovery device, so that the air jet mill can continue to operate when the filter element 13 is being backflushed for cleaning. Simultaneously, the filter element 13 will not come into contact with the extremely fine dust floating in the filtration unit, and the airflow direction will not change when the filter element 13 is backflushed, thus improving the cleaning effect of the filter element 13 during backflushing. The specific structure and working process of the present invention are as follows: The partition 11 has a circular structure with multiple circular openings 111 evenly distributed around its axis. Each circular opening 111 corresponds to a filter element 13. During normal use, all filter elements 13 are located in the lower cavity and are in filtration mode. After a period of use, the filter elements 13 are cleaned. During cleaning, the filter elements 13 are lifted one by one into the upper cavity by the lifting rod 12. That is, when one filter element 13 is lifted into the upper cavity by its corresponding lifting rod 12... The remaining filter elements 13 remain in the lower cavity and are still in the filtration state. In order to overcome the situation where the filtration load of the remaining filter elements 13 increases when cleaning the filter elements 13, the frequency of periodic cleaning of the filter elements 13 can be increased, such as cleaning once every 3 to 4 hours. It can also be set according to the actual situation. This ensures that when one filter element 13 is in the cleaning state, the surface of the other filter elements 13 has not been covered with too much fine dust, and ensures that the filtration capacity of the other filter elements 13 will not be affected when one filter element 13 is missing. In addition, after the filter element 13 is lifted to the upper cavity by the lifting rod 12, the discharge unit 14 located at the lower part of the filter element 13 contacts the lower part of the partition 11. At this time, the filter element 13 no longer comes into contact with the airflow and ultrafine dust in the lower cavity, and the rising airflow in the lower cavity will not act on the filter element 13. Then the blowing unit 15 is activated, and the blowing unit 15 blows the airflow toward the filter element 13. The discharge unit 14 discharges the ultrafine dust and airflow at the same time. Therefore, the airflow blown out by the blowing unit 15 can pass through the filter element 13 smoothly. At this time, the ultrafine dust attached to the filter element 13 will be blown off. The blown-off ultrafine dust is collected by the discharge unit 14. After the filter element 13 is cleaned, the cleaned filter element 13 is lowered by the corresponding lifting rod 12 and enters the lower cavity. Then the next filter element 13 is lifted, and the cycle repeats.

[0036] By providing a partition 11 in the housing 1, the housing 1 is divided into an upper cavity and a lower cavity. A circular opening 111 is provided on the partition 11, and a lifting rod 12 is vertically movable on the circular opening 111. The two ends of the filter element 13 are respectively positioned on the circular opening 111 and the lifting rod 121. When the filter element 13 is in the filtration state, it is located in the lower cavity. When the filter element 13 is in the self-cleaning state, it is located in the upper cavity. At this time, the discharge unit 14 contacts the lower part of the partition 11, allowing the filter element in the self-cleaning state to... The filter element 13 is no longer in contact with the lower cavity, and the airflow in the lower cavity will not affect the filter element 13 in the self-cleaning state. This ensures that the airflow blown out by the blowing unit 15 will not be disturbed by the rising airflow in the lower cavity. This ensures that when the filter element 13 is back-blown cleaned, the airflow can continuously and comprehensively pass through the filter element 13 in one direction, so that the extremely fine dust attached to the filter element 13 can be quickly cleaned and discharged through the discharge unit 14. This achieves simultaneous cleaning of the filter element 13 while the airflow pulverizer is running, and also ensures the cleaning speed and cleaning effect of the filter element 13.

[0037] Reference Figure 8 The air blowing unit 15 includes a housing 151 and an air blowing pipe 152; The housing 151 is vertically fixed above the circular opening 111, and the housing 151 forms a sealed cavity above the circular opening 111. An air blowing pipe 152 is arranged around the housing 151 and can blow air into the housing 151.

[0038] When the lifting rod 12 raises the filter element 13 into the upper cavity, the end of the filter element 13 with the larger opening is located below the end with the smaller opening, and the discharge unit 14 contacts the upper part of the partition 11, thus isolating the filter element 13 entering the upper cavity from the lower cavity. At the same time, by setting a shell 151 on the circular opening 111 and setting an air blowing pipe 152 on the shell 151 to blow air into the shell 151, the airflow blown out by the air blowing pipe 152 is located inside the shell 151 rather than in the entire upper cavity, reducing the dispersion of the airflow blown out by the air blowing pipe 152. At this time, the airflow in the lower cavity cannot affect the filter element 13 being cleaned, so the direction of the airflow through the filter element 13 remains unchanged, thereby ensuring that the dust attached to the filter element 13 is quickly blown off under the action of the airflow, further improving the back-blowing effect.

[0039] Reference Figure 6 and Figure 7 The filter unit also includes an exhaust trough 122, an exhaust pipe 123, a first switching valve 124, and a bellows 125; The exhaust vent 122 is vertically opened at the upper end of the lifting rod 12 and communicates with the inside of the housing 151; The exhaust pipe 123 is located on the upper part of the housing 151; The first switching valve 124 is installed on the exhaust pipe 123; The bellows 125 is vertically installed between the lifting rod 12 and the exhaust pipe 123, and the two ends of the bellows 125 are fixedly connected to the lifting rod 12 and the exhaust pipe 123 respectively.

[0040] During filtration, the filter element 13 is located in the lower cavity, and the lifting rod 12 is at its lowest position. The airflow in the lower cavity carries extremely fine dust particles towards the filter element 13. After being filtered by the filter element 13, the airflow passes smoothly through it, while the extremely fine dust particles are intercepted. The airflow passing through the filter element 13 enters the exhaust groove 122 and, guided by the bellows 125, enters the exhaust pipe 123. It is worth noting that when the filter element 13 is in the filtration state, the first switching valve 124 is in the open state; when the filter element 13 is in the self-cleaning state, the first switching valve 124 is in the closed state. This ensures that when the filter element 13 is in the self-cleaning state, the gas blown out by the air blowing pipe 152 will not be discharged from the exhaust groove 122, thus ensuring the airflow pressure during backflushing. In addition, since the lifting rod 12 can move freely up and down in the vertical direction, the bellows 125 is installed between the lifting rod 12 and the exhaust pipe 123, allowing the bellows 125 to extend and retract automatically according to the movement of the lifting rod 12.

[0041] Reference Figure 3 , Figure 5 and Figure 6 The filter unit also includes a drive unit 16 for driving the lifting rod 12 to rise and fall. The drive unit 16 includes a rotary driver 161, a lead screw 162 and a transmission assembly 163. The rotary actuator 161 is vertically mounted on top of the housing 151; The lead screw 162 is vertically rotatably mounted in the housing 151 and is fixedly connected to the output end of the rotary driver 161; The transmission assembly 163 is mounted on the lifting rod 12, and the lead screw 162 passes vertically through the transmission assembly 163 and is threadedly engaged with the transmission assembly 163.

[0042] The rotary driver 161 is preferably a servo motor. When the lead screw 162 rotates, it can drive the transmission component 163 to rise and fall, thereby enabling the lifting rod 12 to rise and fall.

[0043] Reference Figure 6 The transmission assembly 163 includes a lifting plate 1631; The lifting plate 1631 is sleeved on the lifting rod 12, and the lead screw 162 passes through the lifting plate 1631 and is threadedly engaged with the lifting plate 1631. The lifting rod 12 can rise and fall synchronously with the lifting plate 1631.

[0044] Reference Figure 7 and Figure 12 The transmission assembly 163 also includes a fixed plate 1632, an extension rod 1633, a limiting block 1634, and a spring 1635; The fixing plate 1632 is fixedly mounted on the lifting rod 12 and located below the lifting plate 1631; The extension rod 1633 is vertically fixed on the fixed plate 1632 and passes through the lifting plate 1631. The extension rod 1633 is slidably engaged with the lifting plate 1631. The limiting block 1634 is fixedly installed at the upper end of the extension rod 1633, and the limiting block 1634 is used to limit the lifting plate 1631. Spring 1635 is disposed between fixed plate 1632 and lifting plate 1631 along the extension direction of extension rod 1633, and both ends of spring 1635 are fixedly connected to fixed plate 1632 and lifting plate 1631 respectively.

[0045] When filter element 13 needs cleaning, rotary driver 161 drives lead screw 162 to rotate. Lead screw 162 drives lifting plate 1631 to rise. Lifting plate 1631 drives fixed plate 1632 to rise via spring 1635, thereby causing lifting rod 12 to rise synchronously with fixed plate 1632. At this time, spring 1635 is in a stretched state, but spring 1635 is not stretched to its longest state. Lifting rod 12 rises synchronously with lifting plate 1631. At the same time, the distance between lifting plate 1631 and limit block 1634 remains constant. When lifting rod 12 continues to rise and makes discharge unit 14 contact the lower part of partition 11, lifting plate 1631 continues to rise. Spring 1635 is gradually stretched, and lifting plate 1631 moves towards limit block 1634. When the lowering plate 1631 contacts the limiting block 1634, the spring 1635 is stretched to its longest state. At this time, the reaction force of the spring 1635 on the discharge unit 14 is the greatest, so that the discharge unit 14 can be tightly attached to the lower part of the partition 11. The reason why the spring 1635 is needed to provide pressure to the discharge unit 14 is that the discharge unit 14 is always in the lower cavity when the filter element 13 is in the filtering state. The extremely fine dust in the lower cavity will fall on the upper part of the discharge unit 14. If the lifting rod 12 does not apply pressure when it drives the discharge unit 14 to rise, there will be gaps between the discharge unit 14 and the partition 11, which will cause the filter element 13 to be unable to be completely isolated from the lower cavity when it is cleaned. However, after setting the spring 1635, it can be ensured that the filter element 13 is completely isolated from the lower cavity when it is cleaned.

[0046] Reference Figure 12 A sliding groove 1636 is provided on the side wall of the lifting rod 12. The lifting plate 1631 extends into the sliding groove 1636 and slides in cooperation with the sliding groove 1636. When the lifting plate 1631 is at the lower end of the sliding groove 1636, the spring 1635 is in an unstretched state.

[0047] By opening a groove 1636 on the lifting rod 12 and allowing the lifting plate 1631 to slide in conjunction with the groove 1636, the groove 1636 limits the lifting plate 1631. When the filter element 13 is in the filtering state, the lifting plate 1631 can directly contact the lifting rod 12 through the lower end of the groove 1636, allowing the fixed plate 1632 to contact the upper part of the partition 11. When the rising airflow exerts an upward thrust on the filter element 13, the lifting rod 12 will not be driven to rise by the filter element 13 due to the abutment of the lifting plate 1631. If the groove 1636 is not provided, the lifting plate 1631 needs to apply pressure to the spring 1635, causing the elastic force of the spring 1635 to act on the fixed plate 1632, thereby counteracting the thrust of the rising airflow in the lower cavity. This results in the spring 1635 needing to be continuously compressed during filtering and stretched during cleaning, ultimately leading to a significant reduction in the service life of the spring 1635. After the slide groove 1636 is set, the lifting plate 1631 directly contacts the slide groove 1636, so that the spring 1635 remains in the original state when the filter element 13 is in the filtering state, thus extending the service life of the spring 1635.

[0048] Reference Figure 5 and Figure 8 The discharge unit 14 includes a discharge hopper 141, a dust removal unit 142, a discharge pipe 143, and a second switching valve 144. The discharge hopper 141 is fixedly installed at the bottom of the lifting rod 12, and the discharge hopper 141 has a funnel-shaped structure; Dust removal unit 142 is located on one side of discharge hopper 141; The two ends of the discharge pipe 143 are connected to the lower part of the discharge hopper 141 and the dust removal unit 142, respectively; The second switching valve 144 is installed on the discharge pipe 143.

[0049] When the filter element 13 is in self-cleaning mode, the upper part of the discharge hopper 141 is in contact with the lower part of the partition 11. When the filter element 13 is in filtration mode, the second switch valve 144 is closed and the first switch valve 124 is open. Since the amount of ultrafine dust in the lower cavity is limited, although some ultrafine dust falls into the discharge hopper 141 or discharge pipe 143 during the filtration process of the filter element 13, the accumulation of ultrafine dust in the discharge pipe 143 is very small because the cleaning cycle time of the filter element 13 is usually 3 to 4 hours. At the same time, the ultrafine dust is easily blown away by the airflow. Therefore, when the filter element 13 is self-cleaned in the future, the air blowing unit 15 can blow the ultrafine dust accumulated on the discharge hopper 141 and in the discharge pipe 143 into the dust removal unit 142 when it back-blowing the filter element 13.

[0050] Reference Figure 10The dust removal unit 142 includes a dust removal housing 1421, a sponge 1422, an atomizer 1423, and an extension tube 1424. The dust collector housing 1421 is fixedly installed at the lower part of the partition 11; The sponge 1422 is horizontally arranged in the dust collector housing 1421, and the lower part of the sponge 1422 and the dust collector housing 1421 form a filter chamber; The atomizer 1423 is mounted on the side wall of the filter chamber; The extension tube 1424 is vertically installed on the upper part of the dust collector housing 1421 and passes through the partition 11.

[0051] When cleaning filter element 13, the cleaned-off ultrafine dust is discharged into dust collector housing 1421 through discharge pipe 143. At this time, atomizer 1423 discharges water mist into the filter chamber. After the airflow carries the ultrafine dust into dust collector housing 1421, the ultrafine dust is intercepted by the water mist. The airflow passes through sponge 1422 and is discharged through extension pipe 1424. Sponge 1422 can also intercept water mist, ensuring the water mist concentration in the filter chamber when intercepting ultrafine dust. A drain pipe is also provided on the side wall of dust collector housing 1421 to discharge the water accumulated at the bottom of dust collector housing 1421 in real time.

[0052] Reference Figure 9 The dust removal unit 142 also includes an extension head 1425 and a dust discharge port 1426; The extension head 1425 is vertically positioned at the bottom of the dust collector housing 1421; The ash discharge port 1426 is located on the extension head 1425 and faces vertically downward.

[0053] By setting the ash discharge port 1426 vertically downward, water mist is prevented from falling onto the ash discharge port 1426 and flowing back into the discharge pipe 143, thus wetting the inner wall of the discharge pipe 143. This causes extremely fine dust to adhere to the inner wall of the discharge pipe 143 and become unable to be discharged. At the same time, it is worth noting that when cleaning the filter element 13, the air blowing unit 15 and the atomizer 1423 operate synchronously, but the atomizer 1423 stops operating before the air blowing unit 15, preventing some water mist from entering the extension head 1425 and the discharge pipe 143 through the ash discharge port 1426.

[0054] Working principle: During normal use, all filter elements 13 are located in the lower cavity, and all filter elements 13 are in the filtration state. After a period of use, the filter elements 13 are cleaned. During cleaning, the filter elements 13 are lifted one by one into the upper cavity by the lifting rod 12. That is, when one filter element 13 is lifted into the upper cavity by its corresponding lifting rod 12, the remaining filter elements 13 are still in the lower cavity and are still in the filtration state. In order to overcome the situation that the filtration load of the remaining filter elements 13 increases when cleaning the filter elements 13, the frequency of periodic cleaning of the filter elements 13 can be increased, such as cleaning once every 3 to 4 hours. It can also be set according to the actual situation. This ensures that when one filter element 13 is in the cleaning state, the surface of the other filter elements 13 has not been covered with too much fine dust, ensuring that the filtration capacity of the other filter elements 13 will not be affected when one filter element 13 is missing. In addition, after the filter element 13 is lifted to the upper cavity by the lifting rod 12, the discharge unit 14 located at the lower part of the filter element 13 contacts the lower part of the partition 11. At this time, the filter element 13 no longer comes into contact with the airflow and ultrafine dust in the lower cavity, and the rising airflow in the lower cavity will not act on the filter element 13. Then the blowing unit 15 is activated, and the blowing unit 15 blows the airflow toward the filter element 13. The discharge unit 14 discharges the ultrafine dust and airflow at the same time. Therefore, the airflow blown out by the blowing unit 15 can pass through the filter element 13 smoothly. At this time, the ultrafine dust attached to the filter element 13 will be blown off. The blown-off ultrafine dust is collected by the discharge unit 14. After the filter element 13 is cleaned, the cleaned filter element 13 is lowered by the corresponding lifting rod 12 and enters the lower cavity. Then the next filter element 13 is lifted, and the cycle repeats.

[0055] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A self-cleaning backflushing recovery device for an air jet mill, characterized in that, The backflush recovery device includes a vertically arranged housing, and the filtration unit also includes a baffle, a lifting rod, a lifting block, a filter element, a discharge unit, and an air blowing unit; The partition is horizontally fixed in the shell and divides the shell into an upper cavity and a lower cavity for containing dust. Multiple circular openings are provided on the partition. The lifting boom is vertically movable and positioned on the circular opening; The lifting block is fixedly mounted on the lifting rod. The lifting block has a ring structure, and the outer diameter of the lifting block is smaller than the diameter of the circular opening. The filter element has a funnel-shaped structure. The larger end of the filter element is fixedly connected to the circular opening, and the smaller end of the filter element is fixedly connected to the outer periphery of the lifting block. When the lifting rod moves up and down, the filter element can extend into the upper or lower cavity. When the filter element is in the upper cavity, it is in a self-cleaning state, and when the filter element is in the lower cavity, it is in a filtering state. The discharge unit is located at the bottom of the lifting rod. When the filter element is in self-cleaning mode, the discharge unit contacts the bottom of the baffle and is used to discharge the dust cleaned off the filter element. The air blowing unit is located at the top of the circular opening, and it blows air onto the filter element that enters the upper cavity.

2. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 1, characterized in that, The air blowing unit includes a housing and an air blowing pipe; The casing is vertically fixed at the top of the circular opening, forming a sealed cavity above the circular opening; The air blowing pipe is arranged around the casing and can blow air into the casing.

3. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 2, characterized in that, The filter unit also includes an exhaust duct, an exhaust pipe, a first switching valve, and a bellows; The exhaust vent is vertically located at the top of the lifting rod and communicates with the inside of the housing; The exhaust pipe is located at the top of the casing; The first switching valve is located on the exhaust pipe; The corrugated pipe is vertically installed between the lifting rod and the exhaust pipe, with both ends of the corrugated pipe fixedly connected to the lifting rod and the exhaust pipe, respectively.

4. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 2, characterized in that, The filtration unit also includes a drive unit for driving the lifting rod to move up and down, the drive unit including a rotary driver, a lead screw and a transmission assembly; The rotary actuator is vertically mounted on top of the housing; The lead screw is vertically rotatable and is fixedly connected to the output end of the rotary actuator. The transmission assembly is mounted on the lifting rod, and the lead screw passes vertically through the transmission assembly and is threaded into the transmission assembly.

5. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 4, characterized in that, The transmission components include a lifting plate; The lifting plate is fitted onto the lifting rod, and the lead screw passes through the lifting plate and is threaded into the lifting plate, so that the lifting rod can rise and fall synchronously with the lifting plate.

6. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 5, characterized in that, The transmission assembly also includes a fixed plate, an extension rod, a limit block, and a spring; The fixing plate is fixedly installed on the lifting rod and located below the lifting plate; The extension rod is vertically fixed on the fixed plate and passes through the lifting plate, with the extension rod slidingly engaged with the lifting plate. The limiting block is fixedly installed at the upper end of the extension rod and is used to limit the lifting plate. The spring is positioned between the fixed plate and the lifting plate along the extension direction of the extension rod, with both ends of the spring fixedly connected to the fixed plate and the lifting plate, respectively.

7. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 6, characterized in that, A sliding groove is provided on the side wall of the lifting rod, and the lifting plate extends into the sliding groove and slides in cooperation with the sliding groove. When the lifting plate is at the lower end of the sliding groove, the spring is in an unstretched state.

8. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 1, characterized in that, The discharge unit includes a discharge hopper, a dust removal unit, a discharge pipe, and a second switching valve; The discharge hopper is fixedly installed at the bottom of the lifting rod, and the discharge hopper has a funnel-shaped structure; The dust removal unit is located on one side of the discharge hopper; The two ends of the discharge pipe are connected to the lower part of the discharge hopper and the dust removal unit, respectively; The second switching valve is installed on the discharge pipe.

9. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 8, characterized in that, The dust removal unit includes a dust removal housing, a sponge, an atomizer, and an extension tube; The dust collector housing is fixedly installed at the bottom of the partition; The sponge is horizontally placed in the dust collector housing, and the lower part of the sponge forms a filter chamber with the dust collector housing; The atomizer is located on the side wall of the filter chamber; The extension pipe is vertically installed at the top of the dust collector housing and passes through the partition.

10. The self-cleaning backflushing recovery device for an airflow pulverizer according to claim 9, characterized in that, The dust removal unit also includes an extension head and a dust discharge port; The extension head is vertically positioned at the bottom of the dust collector housing; The ash discharge port is located on the extension head and faces vertically downwards.

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