Self-cleaning backflushing and recycling device for jet mill

Abstract

The present application relates to the technical field of jet mill, in particular to a self-cleaning back-blowing recovery device for jet mill, which comprises a vertically arranged shell, a filter unit further comprising a partition, a lifting rod, a lifting block, a filter core, a discharge unit and a blowing unit; the partition is horizontally 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; the lifting rod is vertically movably arranged on the circular opening; the lifting block is fixedly arranged on the lifting rod and has an annular structure, and the outer diameter of the lifting block is smaller than the diameter of the circular opening; the filter core has a funnel-shaped structure, and the larger end of the filter core port is fixedly connected with the circular opening, and the smaller end of the filter core port is fixedly connected with the lifting block; the discharge unit is arranged at the lower part of the lifting rod; and the blowing unit is arranged at the upper part of the circular opening. The present application can realize the synchronous cleaning of the filter core while the jet mill is continuously running, and can also ensure the cleaning speed and effect of the filter core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of jet mills, in particular to a self-cleaning back-blowing recovery device for a jet mill. BACKGROUND

[0002] In the prior art, after being crushed, the jet mill needs to transport the crushed solid powder to a powder cyclone collector. Most of the powder is discharged from the bottom of the cyclone collector, and part of the extremely fine particles rise with the airflow. The upper part of the cyclone collector is provided with a filter core, which intercepts the rising extremely fine particle dust. Long-term use can easily cause the filter core to be blocked. This blockage not only requires regular maintenance and cleaning, but also may involve replacing the filter core, resulting in increased costs and increased cleaning and maintenance workload, further reducing the production efficiency of the equipment, and failing to effectively solve the problem of filter core blockage and improve the continuous operation capability of the equipment.

[0003] Chinese Patent No. CN221063766U discloses a dust recovery back-blowing device for a jet mill, which comprises a support frame, a jet mill fixedly installed at one end of the top of the support frame, a dust collection barrel fixedly installed at the other end of the top of the support frame, a dust suction pipe fixedly installed on the circular arc surface of one side of the dust collection barrel, a feed inlet of the dust suction pipe fixedly installed with an exhaust end of the jet mill, a filter recovery mechanism arranged in the dust collection barrel, and a back-blowing device arranged at the top of the filter recovery mechanism. The filter recovery mechanism realizes the action of recovering and filtering the dust in the interior of the jet mill, and the back-blowing device realizes the action of preventing the filtered dust in the interior of the filter recovery mechanism from being adsorbed.

[0004] The above-mentioned scheme enables the filter core to be self-cleaned by back-blowing. However, during back-blowing, the filter core in the integrated barrel cannot perform normal filtering work, resulting in the need for the jet mill to be shut down when the filter core is back-blowed and cleaned, otherwise the back-blowing gas cannot be normally discharged, further affecting the crushing efficiency. If half of the filter cores are in a back-blowing state and the other half are in a filtering state, the filter cores in the back-blowing state are still in a dust environment, and there is a bidirectional airflow near the filter cores, so the back-blowing effect is poor. In addition to back-blowing for self-cleaning, the existing filter core of the jet mill can also be shaken to make the dust attached to the filter core fall off. However, under the action of the airflow, the dust adsorbed on the filter core can leave the surface of the filter core when the filter core is shaken, but it will quickly re-adsorb on the filter core. Although the jet mill does not need to be shut down, the self-cleaning effect of the filter core is poor. SUMMARY

[0005] In view of the above problems, the self-cleaning back-blowing recovery device for an air flow pulverizer is provided, a partition plate is arranged in the shell to divide the shell into an upper cavity and a lower cavity, a circular opening is arranged on the partition plate, a lifting rod is vertically arranged on the circular opening, two ports of a filter element are arranged on the circular opening and the lifting block respectively, when the filter element is in a filtering state, the filter element is in the lower cavity, when the filter element is in a self-cleaning state, the filter element is in the upper cavity, and at this time, the discharge unit is in contact with the lower part of the partition plate, so that the filter element in the self-cleaning state is no longer in contact with the lower cavity, and the airflow in the lower cavity has no effect on the filter element in the self-cleaning state, thereby ensuring that the airflow blown by the blowing unit is not disturbed by the rising airflow in the lower cavity, and further ensuring that when the filter element is back-blowing cleaned, the airflow can continuously and comprehensively pass through the filter element in one direction, so that the extremely fine dust attached to the filter element can be quickly cleaned and discharged through the discharge unit.

[0006] To solve the problems in the prior art, the self-cleaning back-blowing recovery device for an air flow pulverizer is provided, which comprises a vertically arranged shell, and further comprises a partition plate, a lifting rod, a lifting block, a filter element, a discharge unit and a blowing unit.

[0007] The partition plate is horizontally fixedly arranged in the shell and divides the shell into an upper cavity and a lower cavity for containing dust, and a plurality of circular openings are formed in the partition plate.

[0008] The lifting rod is vertically movably arranged on the circular opening.

[0009] The lifting block is fixedly arranged on the lifting rod, the lifting block has an annular structure, and the outer diameter of the lifting block is smaller than the diameter of the circular opening.

[0010] The filter element has a funnel-shaped structure, one end of a filter element port is fixedly connected with the circular opening, and the other end of the filter element port is fixedly connected with the outer periphery of the lifting block, the lifting rod can extend the filter element into the upper cavity or the lower cavity when the lifting rod is lifted, the filter element is in a self-cleaning state when the filter element is in the upper cavity, and the filter element is in a filtering state when the filter element is in the lower cavity.

[0011] The discharge unit is arranged at the lower part of the lifting rod, and the discharge unit is in contact with the lower part of the partition plate when the filter element is in a self-cleaning state and is used to discharge the dust cleaned by the filter element.

[0012] The blowing unit is arranged at the upper part of the circular opening, and the blowing unit blows air to the filter element in the upper cavity.

[0013] Preferably, the blowing unit comprises a sleeve and a blowing pipe.

[0014] The sleeve is vertically fixedly arranged at the upper part of the circular opening, and the sleeve forms a sealed cavity above the circular opening.

[0015] The blowing pipe is arranged around the sleeve and can blow air into the sleeve.

[0016] Preferably, the back-blowing recovery device further comprises an exhaust groove, an exhaust pipe, a first switch valve and a bellows.

[0017] The exhaust groove is vertically arranged at the upper end of the lifting rod and communicates with the inside of the sleeve.

[0018] The exhaust pipe is arranged at the upper part of the sleeve.

[0019] The first switch valve is arranged on the exhaust pipe.

[0020] The bellows is vertically arranged between the lifting rod and the exhaust pipe, and the two ends of the bellows are fixedly connected with the lifting rod and the exhaust pipe respectively.

[0021] Preferably, the back-blowing recovery device further comprises a driving unit for driving the lifting rod to lift, and the driving unit comprises a rotary driver, a lead screw and a transmission assembly.

[0022] The rotary driver is vertically arranged at the top of the sleeve.

[0023] The lead screw is vertically arranged in the sleeve and is fixedly connected with the output end of the rotary driver.

[0024] The transmission assembly is arranged on the lifting rod, and the lead screw vertically passes through the transmission assembly and is threadedly connected with the transmission assembly.

[0025] Preferably, the transmission assembly comprises a lifting plate.

[0026] The lifting plate is sleeved on the lifting rod, the lead screw passes through the lifting plate and is threadedly connected with the lifting plate, and the lifting rod can lift synchronously with the lifting plate.

[0027] Preferably, the transmission assembly further comprises a fixed plate, an extension rod, a limiting block and a spring.

[0028] The fixed plate is fixedly arranged on the lifting rod and is below the lifting plate.

[0029] The extension rod is vertically fixedly arranged on the fixed plate and passes through the lifting plate, and the extension rod is slidably connected with the lifting plate.

[0030] The limiting block is fixedly arranged at the upper end of the extension rod, and the limiting block is used for limiting the lifting plate.

[0031] The spring is arranged between the fixed plate and the lifting plate along the extension direction of the extension rod, and the two ends of the spring are fixedly connected with the fixed plate and the lifting plate respectively.

[0032] Preferably, a sliding groove is arranged on the side wall of the lifting rod, the lifting plate extends into the sliding groove and is slidably connected with the sliding groove, and when the lifting plate is at the lower end of the sliding groove, the spring is in an un-stretched state.

[0033] Preferably, the discharging unit comprises a discharging hopper, a dust removal unit, a discharging pipe and a second switch valve;

[0034] The discharging hopper is fixedly arranged at the bottom of the lifting rod and has a funnel structure;

[0035] The dust removal unit is arranged at one side of the discharging hopper;

[0036] Two ends of the discharging pipe are in communication with the lower part of the discharging hopper and the dust removal unit respectively;

[0037] The second switch valve is arranged on the discharging pipe.

[0038] Preferably, the dust removal unit comprises a dust removal shell, a sponge, an atomizer and an extension pipe;

[0039] The dust removal shell is fixedly arranged at the lower part of the partition plate;

[0040] The sponge is horizontally arranged in the dust removal shell, and the lower part of the sponge forms a filtering cavity with the dust removal shell;

[0041] The atomizer is arranged on the side wall of the filtering cavity;

[0042] The extension pipe is vertically arranged at the upper part of the dust removal shell and penetrates the partition plate.

[0043] Preferably, the dust removal unit further comprises an extension head and an ash discharge port;

[0044] The extension head is vertically arranged at the bottom of the dust removal shell;

[0045] The ash discharge port is arranged on the extension head and vertically downward.

[0046] The beneficial effects of the present application compared with the prior art are:

[0047] 1、The present application sets a partition plate in the shell body, so that the shell body is divided into an upper cavity and a lower cavity by the partition plate, a circular opening is arranged on the partition plate, and a lifting rod is vertically arranged on the circular opening, two ports of the filter element are arranged on the circular opening and the lifting block respectively, when the filter element is in the filtering state, the filter element is in the lower cavity, when the filter element is in the self-cleaning state, the filter element is in the upper cavity, and at this time, the discharging unit is in contact with the lower part of the partition plate, so that the filter element in the self-cleaning state is no longer in contact with the lower cavity, the airflow in the lower cavity will not affect the filter element in the self-cleaning state, which ensures that the airflow blown by the blowing unit will not be disturbed by the ascending airflow in the lower cavity, thereby ensuring that when the filter element is cleaned by back blowing, the airflow can continuously and comprehensively pass through the filter element in one direction, so that the extremely fine dust attached to the filter element can be quickly cleaned and discharged through the discharging unit, realizing that the filter element can be cleaned synchronously while the airflow pulverizer is continuously running, and the cleaning speed and cleaning effect of the filter element can be ensured.

[0048] 2、When the lifting rod drives the filter core to rise into the upper cavity, the larger opening end of the filter core is below the smaller opening end, and the discharge unit contacts the upper part of the partition plate, so that the filter core in the upper cavity is isolated from the lower cavity, and the sleeve is arranged on the circular opening, and the air blowing pipe for blowing air into the sleeve is arranged on the sleeve, so that the airflow blown by the air blowing pipe is in the sleeve instead of the whole upper cavity, the dispersibility of the airflow blown by the air blowing pipe is reduced, and the airflow in the lower cavity cannot affect the filter core during cleaning, so the airflow direction through the filter core is always unchanged, thereby ensuring that the dust attached to the filter core is quickly blown down under the action of the airflow, and the back blowing effect is further improved.

[0049] 3、The spring is arranged between the lifting plate and the fixed plate, so that the spring provides pressure for the discharge unit, ensures that the discharge unit can be tightly pressed on the partition plate after contacting the partition plate, and ensures that the filter core is completely isolated from the lower cavity, and the sliding groove is also arranged on the lifting rod, and when the filter core is in the filtering state, the lifting plate directly contacts the sliding groove, so that the spring remains in the original state when the filter core is in the filtering state, and the service life of the spring is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a perspective view of the self-cleaning back blowing and recycling device for the airflow pulverizer.

[0051] Figure 2 It is a side view of the self-cleaning back blowing and recycling device for the airflow pulverizer.

[0052] Figure 3 It is a perspective view of the self-cleaning back blowing and recycling device for the airflow pulverizer. Figure 2 It is a sectional view of A-A in the self-cleaning back blowing and recycling device for the airflow pulverizer.

[0053] Figure 4 It is a sectional view of B in the self-cleaning back blowing and recycling device for the airflow pulverizer. Figure 3 It is a local enlarged view of B in the self-cleaning back blowing and recycling device for the airflow pulverizer.

[0054] Figure 5 It is a sectional view of the self-cleaning back blowing and recycling device for the airflow pulverizer.

[0055] Figure 6 It is a local enlarged view of C in the self-cleaning back blowing and recycling device for the airflow pulverizer. Figure 5

[0056] Figure 7 It is a local enlarged view of D in the self-cleaning back blowing and recycling device for the airflow pulverizer. Figure 5

[0057] Figure 8 ​​It is the self-cleaning back-blowing recovery device for jet mill of the application Figure 5 The local enlarged view at E in the middle.

[0058] Figure 9 It is the self-cleaning back-blowing recovery device for jet mill of the application Figure 5 The local enlarged view at F in the middle.

[0059] Figure 10 It is the cutaway perspective view of the self-cleaning back-blowing recovery device for jet mill of the application after removing the shell.

[0060] Figure 11 It is the perspective view of the self-cleaning back-blowing recovery device for jet mill of the application after removing the shell.

[0061] Figure 12 It is the cutaway perspective view of the self-cleaning back-blowing recovery device for jet mill of the application after removing the shell and the discharge unit.

[0062] The figure label is: 1, shell; 11, partition; 111, circular opening; 12, lifting rod; 121, lifting block; 122, exhaust groove; 123, exhaust pipe; 124, first switch valve; 125, corrugated pipe; 13, filter element; 14, discharge unit; 141, discharge hopper; 142, dust removal unit; 1421, dust removal shell; 1422, sponge; 1423, atomizer; 1424, extension pipe; 1425, extension head; 1426, ash discharge port; 143, discharge pipe; 144, second switch valve; 15, blowing unit; 151, sleeve shell; 152, blowing pipe; 16, driving unit; 161, rotary driver; 162, lead screw; 163, transmission assembly; 1631, lifting plate; 1632, fixed plate; 1633, extension rod; 1634, limit block; 1635, spring; 1636, sliding groove. DETAILED DESCRIPTION

[0063] In order to further understand the features, technical means and specific purposes and functions achieved by the application, the application will be described in further detail below with reference to the drawings and specific embodiments.

[0064] Referring to Figures 1-3 , Figure 5 and Figure 11 : the self-cleaning back-blowing recovery device for jet mill, the back-blowing recovery device comprises a vertically arranged shell 1, and further comprises a partition 11, a lifting rod 12, a lifting block 121, a filter element 13, a discharge unit 14 and a blowing unit 15;

[0065] A partition plate 11 is horizontally fixed in the shell 1 and divides the shell 1 into an upper cavity and a lower cavity for containing dust, a plurality of circular openings 111 are formed in the partition plate 11;

[0066] A lifting rod 12 is vertically movably arranged on the circular openings 111;

[0067] A lifting block 121 is fixed on the lifting rod 12, the lifting block 121 is annular, and the outer diameter of the lifting block 121 is smaller than the diameter of the circular opening 111;

[0068] The filter core 13 is funnel-shaped, the larger end of the filter core 13 is fixedly connected with the circular opening 111, and the smaller end of the filter core 13 is fixedly connected with the outer periphery of the lifting block 121; when the lifting rod 12 is lifted, the filter core 13 can be extended into the upper cavity or the lower cavity; when the filter core 13 is in the upper cavity, the filter core 13 is in a self-cleaning state; and when the filter core 13 is in the lower cavity, the filter core 13 is in a filtering state;

[0069] A discharge unit 14 is arranged at the lower part of the lifting rod 12, when the filter core 13 is in the self-cleaning state, the discharge unit 14 is in contact with the lower part of the partition plate 11 and is used for discharging the dust cleaned by the filter core 13;

[0070] A blowing unit 15 is arranged at the upper part of the circular opening 111, and the blowing unit 15 blows air to the filter core 13 in the upper cavity.

[0071] The airflow pulverizer is blown by high-speed airflow to make the material flow at high speed, and the material collides with each other in the process of flowing, and the collided material is gradually pulverized, and the pulverizing effect is better than that of the traditional material pulverizing equipment, and the airflow pulverizer mainly comprises a pulverizing unit, a screening unit, a back-blowing recovery device and a tail gas treatment unit, the material is pulverized by the pulverizing unit and screened by the screening unit, the material meeting the particle size is screened out by the screening unit, and the material not meeting the particle size is re-discharged into the pulverizing unit for secondary pulverizing, since the pulverizing unit pulverizes the material by using the continuously charged high-speed airflow, the airflow discharged from the pulverizing unit into the screening unit enters the back-blowing recovery device from the upper part of the screening unit, the screening unit is mainly suitable for cyclone separation, and part of the extremely fine dust enters the back-blowing recovery device with the airflow, the main work of the back-blowing recovery device is to separate the extremely fine dust from the airflow, so as to ensure that the filtered airflow does not contain extremely fine dust, and the airflow discharged from the back-blowing recovery device also needs to be treated by the tail gas treatment unit, because when the material is pulverized by the high-speed airflow, the material generates high temperature under high-speed collision, and harmful volatile gas and combustion residual gas are also generated, and if the gas is directly discharged, the environment is greatly polluted. The filter element 13 in the back-blowing recovery device needs to be cleaned after a period of filtering of the extremely fine dust, and most of the filter element 13 needs to be disassembled for cleaning, in order to reduce the workload, a self-cleaning back-blowing recovery device is arranged in the back-blowing recovery device in the prior art, and back-blowing of the extremely fine dust attached to the filter element 13 is realized, but in the process of back-blowing of the filter element 13, the airflow pulverizer cannot normally operate, because the airflow in the pulverizing unit cannot be normally discharged, if only a single filter element 13 is back-blowed, the airflow pulverizer is in a continuous operation state, and then the cleaning effect of the filter element 13 is poor, because when the airflow pulverizer operates, the filter element 13 being cleaned is not isolated, a small amount of extremely fine dust floats on one side of the filter element 13 with attached extremely fine dust, and the back-blowing airflow and the airflow entering the back-blowing recovery device impact each other, so that it cannot be ensured that the airflow can continuously and comprehensively pass through the filter element 13 during back-blowing, the cleaning time is long, and the cleaning effect is poor.

[0072] In order to avoid the above situation, the back-blowing recovery device is redesigned in the present application, so that the filter element 13 can still be in a continuous operation state when being back-blowed and cleaned, the filter element 13 will not be in contact with the extremely fine dust floating in the back-blowing recovery device, the direction of the airflow when the filter element 13 is back-blowing will not be changed, and the cleaning effect of the filter element 13 when being back-blowing is improved. The specific structure and working process of the present application are as follows:

[0073] The partition plate 11 is circular in structure, and a plurality of circular openings 111 are formed on the partition plate 11 and are uniformly distributed around the axis of the partition plate 11. One filter element 13 is arranged on each circular opening 111. In normal use, all the filter elements 13 are located in the lower cavity, and at this time, all the filter elements 13 are in a filtering state. After a period of use, the filter elements 13 are cleaned. When the filter elements 13 are cleaned, the filter elements 13 are lifted one by one to the upper cavity by the lifting rods 12. At this time, one filter element 13 is lifted to the upper cavity by its corresponding lifting rod 12, and the remaining filter elements 13 are still in the lower cavity. The remaining filter elements 13 are still in a filtering state. In order to overcome the situation that the filtering load of the remaining filter elements 13 increases when the filter elements 13 are cleaned, the frequency of the periodic cleaning of the filter elements 13 can be increased, such as cleaning once every 3-4 hours, or it can be set according to the actual situation. When one filter element 13 is in a cleaning state, the surface of the other filter elements 13 has not yet attached too much fine dust, and the filtering capacity of the other filter elements 13 is not affected in the absence of one filter element 13. In addition, after the filter element 13 is lifted to the upper cavity by the lifting rod 12, the discharge unit 14 arranged at the lower part of the filter element 13 contacts the lower part of the partition plate 11. At this time, the filter element 13 is no longer in contact with the airflow and fine dust in the lower cavity. The airflow rising in the lower cavity does not act on the filter element 13. Then, the air blowing unit 15 is started. The air blowing unit 15 blows the airflow to the filter element 13. The discharge unit 14 simultaneously discharges the fine dust and the airflow. Therefore, the airflow blown by the air blowing unit 15 can smoothly pass through the filter element 13. At this time, the fine dust attached to the filter element 13 is blown down. The blown-down fine dust is collected by the discharge unit 14. After the cleaning of the filter element 13 is completed, the cleaned filter element 13 is lowered under the driving of the lifting rod 12 corresponding to the filter element 13. The filter element 13 enters the lower cavity. Then, the next filter element 13 is lifted, and the cycle is repeated.

[0074] By arranging the partition plate 11 in the shell 1, the shell 1 is divided into an upper cavity and a lower cavity by the partition plate 11, a circular opening 111 is arranged on the partition plate 11, and a lifting rod 12 is arranged vertically on the circular opening 111, two ports of the filter element 13 are arranged on the circular opening 111 and the lifting block 121 respectively, when the filter element 13 is in the filtering state, the filter element 13 is in the lower cavity, when the filter element 13 is in the self-cleaning state, the filter element 13 is in the upper cavity, and at this time, the exhaust unit 14 is in contact with the lower part of the partition plate 11, so that the filter element 13 in the self-cleaning state is no longer in contact with the lower cavity, and the airflow in the lower cavity has no effect on the filter element 13 in the self-cleaning state, which ensures that the airflow blown by the blowing unit 15 will not be disturbed by the rising airflow in the lower cavity, thereby ensuring that when the filter element 13 is cleaned by back blowing, 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 exhaust unit 14, realizing the simultaneous cleaning of the filter element 13 while the airflow pulverizer is continuously running, and ensuring the cleaning speed and effect of the filter element 13.

[0075] With reference to Figure 8 : The blowing unit 15 comprises a sleeve 151 and a blowing pipe 152.

[0076] The sleeve 151 is vertically fixedly arranged on the upper part of the circular opening 111, and the sleeve 151 forms a sealed cavity above the circular opening 111.

[0077] The blowing pipe 152 is arranged around the sleeve 151 and can blow air into the sleeve 151.

[0078] When the lifting rod 12 drives the filter element 13 to rise into the upper cavity, the larger opening end of the filter element 13 is located below the smaller opening end of the filter element 13, and the exhaust unit 14 is in contact with the upper part of the partition plate 11, so that the filter element 13 in the upper cavity is isolated from the lower cavity, and by arranging the sleeve 151 on the circular opening 111 and the blowing pipe 152 for blowing air into the sleeve 151, the airflow blown by the blowing pipe 152 is in the sleeve 151 rather than the entire upper cavity, reducing the dispersibility of the airflow blown by the blowing pipe 152, and at this time, the airflow in the lower cavity has no effect on the filter element 13 being cleaned, so the direction of the airflow passing through the filter element 13 is always unchanged, thereby ensuring that the dust attached to the filter element 13 is quickly blown down under the action of the airflow, further improving the back blowing effect.

[0079] With reference to Figure 6 and Figure 7 : The back blowing and recycling device further comprises an exhaust groove 122, an exhaust pipe 123, a first switch valve 124 and a corrugated pipe 125.

[0080] The exhaust groove 122 is vertically arranged at the upper end of the lifting rod 12 and communicates with the inside of the sleeve 151;

[0081] The exhaust pipe 123 is arranged at the upper part of the sleeve 151;

[0082] The first switch valve 124 is arranged on the exhaust pipe 123;

[0083] The bellows 125 is vertically arranged between the lifting rod 12 and the exhaust pipe 123, and the two ends of the bellows 125 are fixedly connected with the lifting rod 12 and the exhaust pipe 123 respectively.

[0084] When filtering, the filter element 13 is in the lower cavity, the lifting rod 12 is in the lowest position, the airflow in the lower cavity carries the superfine dust to the filter element 13, after filtering by the filter element 13, the airflow smoothly passes through the filter element 13, the superfine dust is intercepted by the filter element 13, the airflow passing through the filter element 13 enters the exhaust groove 122 and enters the exhaust pipe 123 under the guidance of the bellows 125, it is worth noting that the first switch valve 124 is in the open state when the filter element 13 is in the filtering state, and the first switch valve 124 is in the closed state when the filter element 13 is in the self-cleaning state, which ensures that the gas blown out by the blowing pipe 152 cannot be discharged from the exhaust groove 122 when the filter element 13 is in the self-cleaning state, thereby ensuring the airflow pressure during back blowing cleaning. In addition, since the lifting rod 12 can freely ascend and descend in the vertical direction, the bellows 125 can be stretched and contracted automatically according to the ascending and descending of the lifting rod 12 by arranging the bellows 125 between the lifting rod 12 and the exhaust pipe 123.

[0085] Referring to Figure 3 , Figure 5 and Figure 6 : The back blowing and recycling device further comprises a driving unit 16 for driving the lifting rod 12 to ascend and descend, the driving unit 16 comprises a rotary driver 161, a lead screw 162 and a transmission assembly 163;

[0086] The rotary driver 161 is vertically arranged at the top of the sleeve 151;

[0087] The lead screw 162 is vertically arranged in the sleeve 151 and is fixedly connected with the output end of the rotary driver 161;

[0088] The transmission assembly 163 is arranged on the lifting rod 12, and the lead screw 162 vertically penetrates the transmission assembly 163 and is threadedly matched with the transmission assembly 163.

[0089] The rotary driver 161 is preferably a servo motor, when the lead screw 162 rotates, the transmission assembly 163 can be driven to ascend and descend, thereby enabling the lifting rod 12 to ascend and descend.

[0090] Referring to Figure 6 : The transmission assembly 163 comprises a lifting plate 1631;

[0091] The lifting plate 1631 is sleeved on the lifting rod 12, the lead screw 162 passes through the lifting plate 1631 and is in threaded cooperation with the lifting plate 1631, and the lifting rod 12 can be lifted synchronously with the lifting plate 1631.

[0092] With reference to Figure 7 And Figure 12 The transmission assembly 163 further comprises a fixing plate 1632, an extension rod 1633, a limiting block 1634 and a spring 1635.

[0093] The fixing plate 1632 is fixedly arranged on the lifting rod 12 and below the lifting plate 1631.

[0094] The extension rod 1633 is vertically fixedly arranged on the fixing plate 1632 and passes through the lifting plate 1631, and the extension rod 1633 is in sliding cooperation with the lifting plate 1631.

[0095] The limiting block 1634 is fixedly arranged on the upper end of the extension rod 1633, and the limiting block 1634 is used for limiting the lifting plate 1631.

[0096] The spring 1635 is arranged between the fixing plate 1632 and the lifting plate 1631 along the extension direction of the extension rod 1633, and two ends of the spring 1635 are fixedly connected with the fixing plate 1632 and the lifting plate 1631 respectively.

[0097] When the filter element 13 needs to be cleaned, the rotary driver 161 drives the screw rod 162 to rotate, the screw rod 162 drives the lifting plate 1631 to rise, the lifting plate 1631 drives the fixed plate 1632 to rise through the spring 1635, and then the lifting rod 12 rises synchronously with the fixed plate 1632, at this time the spring 1635 is in a stretched state, but the spring 1635 is not stretched to the longest state, the lifting rod 12 rises synchronously with the lifting plate 1631, and the distance between the lifting plate 1631 and the limiting block 1634 is constant, when the lifting rod 12 continues to rise and the discharge unit 14 contacts the lower part of the partition plate 11, the lifting plate 1631 continues to rise, the spring 1635 is gradually stretched, and the lifting plate 1631 moves towards the limiting block 1634, when the lifting plate 1631 contacts the limiting block 1634, the spring 1635 is stretched to the longest state, at this time the spring 1635 has the maximum reaction force on the discharge unit 14, so that the discharge unit 14 can tightly adhere to the lower part of the partition plate 11, and the spring 1635 is needed to provide pressure for the discharge unit 14 because the discharge unit 14 is always in the lower cavity when the filter element 13 is in the filtering state, and the very fine dust in the lower cavity will fall on the upper part of the discharge unit 14, if the lifting rod 12 drives the discharge unit 14 to rise without applying pressure, then the gap between the discharge unit 14 and the partition plate 11 is easy to appear, and then the filter element 13 cannot be completely isolated from the lower cavity when being cleaned, and after the spring 1635 is arranged, the filter element 13 can be completely isolated from the lower cavity when being cleaned.

[0098] With reference to Figure 12 : A sliding groove 1636 is formed in the side wall of the lifting rod 12, the lifting plate 1631 extends into the sliding groove 1636 and slidably cooperates 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.

[0099] The sliding groove 1636 is arranged on the lifting rod 12, and the lifting plate 1631 is in sliding fit with the sliding groove 1636, so that the sliding 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 sliding groove 1636, so that the fixed plate 1632 contacts the upper part of the partition plate 11, when the upward airflow generates an upward thrust on the filter element 13, under the abutting action of the lifting plate 1631, the lifting rod 12 will not be driven upward by the filter element 13, if the sliding groove 1636 is not arranged, the spring 1635 needs to be pressed by the lifting plate 1631, so that the elastic force of the spring 1635 acts on the fixed plate 1632, thereby offsetting the thrust of the upward airflow in the lower cavity, so that the spring 1635 needs to be continuously in the compressed state during filtering, and needs to be in the stretched state during cleaning, finally the service life of the spring 1635 is greatly reduced. After the sliding groove 1636 is arranged, the spring 1635 is directly contacted by the lifting plate 1631 and the sliding groove 1636, so that the spring 1635 is kept in the restored state when the filter element 13 is in the filtering state, thereby prolonging the service life of the spring 1635.

[0100] With reference to Figure 5 and Figure 8 : The discharge unit 14 comprises a discharge hopper 141, a dust removal unit 142, a discharge pipe 143 and a second switch valve 144;

[0101] The discharge hopper 141 is fixedly arranged at the bottom of the lifting rod 12, and the discharge hopper 141 has a funnel-shaped structure;

[0102] The dust removal unit 142 is arranged on one side of the discharge hopper 141;

[0103] The two ends of the discharge pipe 143 are respectively communicated with the lower part of the discharge hopper 141 and the dust removal unit 142;

[0104] The second switch valve 144 is arranged on the discharge pipe 143.

[0105] When the filter element 13 is in the self-cleaning state, the upper part of the discharge hopper 141 contacts the lower part of the partition plate 11. When the filter element 13 is in the filtering state, the second switch valve 144 is in the closed state, and the first switch valve 124 is in the open state. Since the amount of the extremely fine dust in the lower cavity is limited, although some extremely fine dust may fall into the discharge hopper 141 or the discharge pipe 143 during the filtering process of the filter element 13, since the cleaning cycle time of the filter element 13 is usually 3-4 hours, the accumulation amount of the extremely fine dust in the discharge pipe 143 is very small, and the extremely fine dust is easily blown by the airflow. Therefore, when the filter element 13 is subsequently self-cleaned, the extremely fine dust accumulated in the discharge hopper 141 and the discharge pipe 143 can be blown into the dust removal unit 142 together by the back blowing of the blowing unit 15 on the filter element 13.

[0106] With reference to Figure 10 : The dust removal unit 142 comprises a dust removal shell 1421, a sponge 1422, an atomizer 1423 and an extension pipe 1424;

[0107] The dust removal shell 1421 is fixedly arranged at the lower part of the partition plate 11;

[0108] The sponge 1422 is horizontally arranged in the dust removal shell 1421, and the lower part of the sponge 1422 forms a filtering cavity with the dust removal shell 1421;

[0109] The atomizer 1423 is arranged on the side wall of the filtering cavity;

[0110] The extension pipe 1424 is vertically arranged at the upper part of the dust removal shell 1421 and penetrates the partition plate 11.

[0111] When the filter element 13 is cleaned, the extremely fine dust cleaned is discharged into the dust removal shell 1421 through the discharge pipe 143, at this time, the atomizer 1423 discharges water mist into the filtering cavity, after the airflow carrying the extremely fine dust enters the dust removal shell 1421, the extremely fine dust is intercepted by the water mist, the airflow passes through the sponge 1422 and is discharged by the extension pipe 1424, the sponge 1422 can also intercept the water mist, which ensures the water mist concentration in the filtering cavity when the extremely fine dust is intercepted. The side wall of the dust removal shell 1421 is also provided with a drain pipe which can discharge water collected at the bottom of the dust removal shell 1421 in real time.

[0112] With reference to Figure 9 : The dust removal unit 142 further comprises an extension head 1425 and a dust discharge port 1426;

[0113] The extension head 1425 is vertically arranged at the bottom of the dust removal shell 1421;

[0114] The dust discharge port 1426 is vertically downwardly arranged on the extension head 1425.

[0115] By vertically downwardly arranging the dust discharge port 1426, the water mist falling on the dust discharge port 1426 and flowing back to the discharge pipe 143 when descending is avoided, so that the inner wall of the discharge pipe 143 is wetted, which further causes the extremely fine dust to adhere to the inner wall of the discharge pipe 143 and cannot be discharged. Meanwhile, it is worth noting that when the filter element 13 is cleaned, the blowing unit 15 and the atomizer 1423 are synchronously operated, but the atomizer 1423 stops operating earlier than the blowing unit 15, which avoids part of the water mist entering the extension head 1425 and the discharge pipe 143 through the dust discharge port 1426.

[0116] Working principle: in normal use, all filter cartridges 13 are located in the lower cavity, at this time all filter cartridges 13 are in the filtering state, after using for a period of time, the cleaning work of the filter cartridges 13 is started, when the filter cartridges 13 are cleaned, the filter cartridges 13 are lifted one by one to the upper cavity through the lifting rods 12, that is, when one of the filter cartridges 13 is lifted to the upper cavity by the corresponding lifting rod 12, the remaining filter cartridges 13 are still in the lower cavity, the remaining filter cartridges 13 are still in the filtering state, in order to overcome the situation that the filtering load of the remaining filter cartridges 13 is increased when the filter cartridges 13 are cleaned, the frequency of the periodical cleaning of the filter cartridges 13 can be increased, such as cleaning once every 3-4 hours, which can also be set according to the actual situation, so that when one of the filter cartridges 13 is in the cleaning state, the surface of the other filter cartridges 13 has not attached too much fine dust, so that the filtering capacity of the other filter cartridges 13 is not affected in the case of lacking one filter cartridge 13. In addition, after the filter cartridges 13 are lifted to the upper cavity by the lifting rods 12, the discharge unit 14 arranged at the lower part of the filter cartridges 13 is in contact with the lower part of the partition plate 11, at this time the filter cartridges 13 are no longer in contact with the airflow and fine dust in the lower cavity, the airflow rising in the lower cavity will not act on the filter cartridges 13, then the air blowing unit 15 is started, the air blowing unit 15 blows the airflow to the filter cartridges 13, the discharge unit 14 discharges the fine dust and the airflow at the same time, so the airflow blown by the air blowing unit 15 can smoothly pass through the filter cartridges 13, at this time the fine dust attached to the filter cartridges 13 will be blown down, the blown-down fine dust is collected by the discharge unit 14, after the cleaning of the filter cartridges 13 is completed, the cleaned filter cartridges 13 are lowered under the drive of the corresponding lifting rod 12, the filter cartridges 13 enter the lower cavity, then the next filter cartridge 13 is lifted, and the cycle is repeated.

[0117] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the protection scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A self-cleaning backflushing and recycling device for an air jet mill, characterized in that, The back-blowing recycling device comprises a vertically arranged shell, a partition plate, a lifting rod, a lifting block, a filter element, a discharge unit and a blowing unit; The partition plate is horizontally fixedly arranged in the shell and divides the shell into an upper cavity and a lower cavity for containing dust, and a plurality of circular openings are formed in the partition plate; The lifting rod is vertically movably arranged on the circular opening; The lifting block is fixedly arranged on the lifting rod and has an annular structure, and an outer diameter of the lifting block is smaller than a diameter of the circular opening; The filter element has a funnel structure, a larger end of a filter element port is fixedly connected with the circular opening, and a smaller end of the filter element port is fixedly connected with an outer periphery of the lifting block, the lifting rod can extend into the upper cavity or the lower cavity when the lifting rod is lifted, the filter element is in a self-cleaning state when the filter element is in the upper cavity, and the filter element is in a filtering state when the filter element is in the lower cavity; The discharge unit is arranged at a lower part of the lifting rod, the discharge unit is in contact with a lower part of the partition plate when the filter element is in the self-cleaning state, and the discharge unit is used for discharging dust cleaned by the filter element; The blowing unit is arranged at an upper part of the circular opening, and the blowing unit blows air to the filter element in the upper cavity.

2. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 1, characterized by The blowing unit comprises a sleeve and a blowing pipe; The sleeve is vertically fixedly arranged at the upper part of the circular opening, and the sleeve forms a sealed cavity above the circular opening; The blowing pipe is arranged around the sleeve and can blow air into the sleeve.

3. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 2, characterized by The back-blowing recycling device further comprises an exhaust groove, an exhaust pipe, a first switch valve and a bellows; The exhaust groove is vertically formed at an upper end of the lifting rod and is in communication with an inside of the sleeve; The exhaust pipe is arranged at an upper part of the sleeve; The first switch valve is arranged on the exhaust pipe; The bellows is vertically arranged between the lifting rod and the exhaust pipe, and two ends of the bellows are fixedly connected with the lifting rod and the exhaust pipe, respectively.

4. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 2, wherein The back-blowing recycling device further comprises a driving unit for driving the lifting rod to lift, and the driving unit comprises a rotary driver, a lead screw and a transmission assembly; The rotary driver is vertically arranged at a top of the sleeve; The lead screw is vertically rotatably arranged in the sleeve and is fixedly connected with an output end of the rotary driver; The transmission assembly is arranged on the lifting rod, and the lead screw vertically penetrates through the transmission assembly and is threadedly connected with the transmission assembly.

5. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 4, wherein The transmission assembly comprises a lifting plate; The lifting plate is sleeved on the lifting rod, the lead screw penetrates through the lifting plate and is threadedly connected with the lifting plate, and the lifting rod can be synchronously lifted with the lifting plate.

6. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 5, wherein The transmission assembly further comprises a fixing plate, an extension rod, a limiting block and a spring; The fixing plate is fixedly arranged on the lifting rod and is located below the lifting plate; The extension rod is vertically fixedly arranged on the fixing plate and penetrates through the lifting plate, and the extension rod is slidably connected with the lifting plate; The limiting block is fixedly arranged at an upper end of the extension rod and is used for limiting the lifting plate; The spring is arranged between the fixing plate and the lifting plate along an extension direction of the extension rod, and two ends of the spring are fixedly connected with the fixing plate and the lifting plate, respectively.

7. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 6, characterized by A sliding groove is formed in a side wall of the lifting rod, the lifting plate extends into the sliding groove and is slidably connected with the sliding groove, and the spring is in an un-stretched state when the lifting plate is located at a lower end of the sliding groove.

8. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 1, wherein The discharge unit comprises a discharge hopper, a dust removal unit, a discharge pipe and a second switch valve; The discharge hopper is fixedly arranged at a bottom of the lifting rod and has a funnel structure; The dust removal unit is arranged at one side of the discharge hopper; Two ends of the discharge pipe are in communication with a lower part of the discharge hopper and the dust removal unit, respectively; The second switch valve is arranged on the discharge pipe.

9. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 8, wherein The dust removal unit comprises a dust removal shell, a sponge, an atomizer and an extension pipe. The dust removal shell is fixedly arranged at the lower part of the partition plate. The sponge is horizontally arranged in the dust removal shell, and the lower part of the sponge forms a filtering cavity with the dust removal shell. The atomizer is arranged on the side wall of the filtering cavity. The extension pipe is vertically arranged at the upper part of the dust removal shell and penetrates the partition plate.

10. The self-cleaning backflushing and recycling device for an airflow pulverizer according to claim 9, wherein The dust removal unit further comprises an extension head and a dust discharge port. The extension head is vertically arranged at the bottom of the dust removal shell. The dust discharge port is vertically downwardly arranged on the extension head.

Images