Multi-stage dust removal device for grain dryer and dust removal method

Abstract

The invention relates to the technical field of dust removal equipment, in particular to a multi-stage dust removal device for a grain dryer and a dust removal method.The multi-stage dust removal device comprises a shell, a water tank, a rotating shaft, a demisting cover, a demisting component, a bag-type dust remover, a sealing baffle, a triggering component, a switching rotating shaft, a stirring component, a pulse cylinder, a pulse piston and a pulse part; gas guided out of the dryer is introduced into the water tank for water cooling, water vapor is removed through the demisting cover and the demisting component, and the cooled and dehumidified gas is further subjected to fine dust removal through the bag-type dust collector and then is exhausted. The bag-type dust collector is communicated with the water tank after a certain dust weight is accumulated through the trigger component, pulse cleaning of the bag-type dust collector is realized through cooperation of the stirring component and the pulse piston, and the cleaned dust is discharged after being mixed and stirred with liquid in the water tank, so that the dust in flue gas is conveniently mixed and cleaned; the dust explosion risk caused by dust raising during cleaning is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal equipment, and specifically to a multi-stage dust removal device and a dust removal method for a grain dryer. Background Art

[0002] Grain dryers are widely used in agricultural production to reduce the moisture content of grain crops such as cereals to ensure their storage safety. However, during the drying process, the gas discharged from the dryer usually has the characteristics of high temperature and high dust content. This not only pollutes the surrounding environment but also may trigger serious dust explosion accidents, threatening production safety and personnel health. Currently, traditional dust removal devices for grain dryers mostly adopt single-stage dust removal structures, such as cyclone dust collectors or bag dust collectors. Although such devices can partially remove dust in the gas, they have the following defects. The gas discharged from the dryer has a relatively high temperature (usually exceeding 100°C), and the filter materials of ordinary bag dust collectors are difficult to withstand high temperatures for a long time, prone to aging or damage, resulting in a decrease in dust removal efficiency. At the same time, the filtration accuracy of single-stage dust removal devices is limited, and it is difficult to effectively capture fine dust of micron size and below, resulting in a relatively high concentration of particulate matter in the discharged gas, which not only pollutes the environment but also may accumulate in pipelines or equipment to form an explosive dust cloud. High-concentration dust is extremely easy to be ignited in a high-temperature and airtight environment. When there is electrostatic accumulation or pulse air blowing to clean the dust removal device, it may trigger a dust explosion, causing equipment damage or even casualties.

[0003] Therefore, a multi-stage dust removal device and a dust removal method for a grain dryer are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-stage dust removal device and a dust removal method for a grain dryer to solve the problems in the prior art that the dust content in the exhaust gas of the grain dryer is high, the gas temperature is high, and there is a risk of dust explosion when using a single-stage dust removal device.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A multi-stage dust removal device for a grain dryer, comprising a housing, a water tank, a rotating shaft, a demisting cover, a demisting component, a bag filter, a sealing baffle, a triggering component, a switching rotating shaft, a stirring component, a pulse cylinder, a pulse piston and a pulse component. The water tank is opened at the bottom of the housing. A demisting cover is arranged above the water tank. The rotating shaft is connected to the center of the demisting cover. The demisting component is arranged at the upper end of the demisting cover. The demisting component is used to drive the rotating shaft to rotate to demist the gas above the water tank. The bag filter is slidably connected in the housing. The sealing baffle is arranged between the demisting cover and the housing. The triggering component is used to monitor the dust removal situation of the bag filter and make it fall quickly when it is overweight, and cooperate with the sealing baffle to conduct the bag filter and the water tank. A support frame is arranged in the center of the bag filter. The switching rotating shaft is rotatably connected in the support frame. The stirring component is arranged at the lower end of the switching rotating shaft, and is used to push the rotating shaft downward and insert it into the water tank for stirring after the bag filter falls. The pulse cylinder is arranged at the upper end of the sliding groove. The pulse piston is slidably connected in the pulse cylinder. When the switching rotating shaft rotates, the pulse component drives the pulse piston to slide up and down in the pulse cylinder to pulse-clean the bag filter below.

[0007] Preferably, an air inlet and a water inlet are arranged at the left end of the water tank, and a drain outlet is arranged at the right end of the water tank.

[0008] Preferably, the demisting component includes a driving gear, a driven gear and a spiral blade. The driving gear is arranged at the upper end of the demisting cover and is driven to rotate by a motor. The driven gear is connected to the rotating shaft, and the driven gear meshes with the driving gear. The spiral blade is arranged in the middle of the rotating shaft. A demisting outlet is opened at the upper end of the demisting cover.

[0009] Preferably, the triggering component includes a triggering groove, a triggering spring, a triggering rod, a triggering push block and a sealing unit. The triggering groove is opened in the housing. The bag filter is slidably connected with the triggering groove. The two ends of the triggering spring are respectively connected with the lower end of the bag filter and the inner wall of the housing. The triggering rod is fixedly connected with the lower end of the bag filter. The triggering push block is fixed at the lower end of the triggering rod. The sealing unit is arranged below the triggering push block and is used to push the sealing baffle to the right when the bag filter descends.

[0010] Preferably, the sealing unit includes a sealing groove, a sealing push block, a sealing spring, a movable communication groove and a fixed communication groove. The sealing groove is opened in the dust removal cover and the housing. The sealing baffle is slidably connected in the sealing groove. The sealing push block is connected to the upper left end of the sealing baffle. The two ends of the sealing spring are respectively connected with the right end of the sealing push block and the inner wall of the housing. The movable communication groove is opened on the sealing baffle. The fixed communication groove is opened at the upper end of the dust removal cover. The triggering push block cooperates with the sealing push block, and the movable communication groove cooperates with the fixed communication groove.

[0011] Preferably, a dust guiding chamfer is provided at the right end of the sealing baffle.

[0012] Preferably, the trigger push block includes a support section and a pressing section. The support section is arranged at the lower right end of the trigger push block, the pressing section is connected to the upper right end of the support section. The angle between the support section and the horizontal line is less than 45°, and the angle between the pressing section and the horizontal line is greater than 45°. Both the support section and the pressing section cooperate with the sealing push block.

[0013] Preferably, the stirring component includes an internal gear ring, an internal rotating groove, an external rotating pin, a pressing groove, a pressing baffle, a pressing spring, a synchronous retaining ring, and a stirring rod. The internal gear ring is fixedly connected to the lower end of the switching rotating shaft, the internal rotating groove is opened at the center of the lower end of the switching rotating shaft, the external rotating pin is arranged at the upper end of the rotating shaft, the external rotating pin cooperates with the internal rotating groove, the internal gear ring cooperates with the driving gear, the pressing groove is opened in the demisting cover, the pressing baffle is fixedly connected to the rotating shaft, the synchronous retaining ring is slidably connected to the rotating shaft in the up and down direction, both ends of the pressing spring are respectively connected to the lower end of the pressing baffle and the upper end of the synchronous retaining ring, the stirring rod is arranged at the lower end of the rotating shaft, and the stirring rod cooperates with the water tank.

[0014] Preferably, the pulse component includes a lifting block, a plugging groove, a plugging spring, a plugging block, a plugging head, a lifting guide groove, and a connecting rod. The lifting block is slidably connected in the switching rotating shaft, the plugging groove is opened in the lifting block, the plugging block is slidably connected in the plugging groove, both ends of the plugging spring are respectively connected to the right end of the plugging block and the inside of the lifting block, the plugging head is arranged at the left end of the plugging block, the lifting guide groove is opened in the switching rotating shaft, a joint groove is opened on one side of the lifting guide groove away from the center of the switching rotating shaft, the joint groove cooperates with the plugging head, expansion grooves are opened at both ends of the lifting guide groove, the expansion grooves cooperate with the plugging head, a limiting groove is opened at the center of the bag filter, the connecting rod is slidably connected to the limiting groove, the upper end of the connecting rod is connected to the pulse piston, and a pulse spring is arranged at the upper end of the pulse piston, and the upper end of the pulse spring abuts against the inner wall of the pulse cylinder.

[0015] A dust removal method includes the multi-stage dust removal device for a grain dryer as described above; and the following method

[0016] By introducing the gas led out from the dryer into the water tank for water-cooling and preliminary large-particle dust removal;

[0017] By using the demisting cover to centrifugally separate and remove water vapor from the cooled gas above the water tank;

[0018] By using the spiral blade and the demisting outlet to convey the cooled and dehumidified gas in the demisting cover to the bag filter;

[0019] The cooled and dehumidified gas is further finely dusted through the bag filter before being discharged;

[0020] After a certain amount of dust has accumulated in the bag filter, the upper end of the demister cover is sealed by a sealing baffle, and the dust collector is connected to the water tank.

[0021] The dust on the bag filter is blown off into the water tank through pulse dust removal;

[0022] The liquid in the water tank is stirred by a stirring rod so that the dust blown into the water tank is mixed with the liquid;

[0023] The liquid mixed with the dust is discharged through the water outlet to complete the pulse dust removal cleaning of the bag.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a water tank, and passes the gas discharged from the dryer into the water tank for water cooling. The cooled gas is centrifuged to remove water vapor by providing a defogger hood and a defogger component, so as to prevent the bag from sticking when further dust removal by a dust collector is carried out. The dust collector further removes fine dust from the cooled and dehumidified gas and discharges it. The bag and dust collector are connected to the water tank through a triggering component after accumulating a certain dust weight. The pulse cleaning of the bag and dust collector is realized by a stirring component and a pulse piston. The cleaned dust is mixed and stirred with the liquid in the water tank and then discharged, so as to facilitate the mixing and cleaning of the dust in the flue gas and prevent the increase of dust explosion risk during cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention;

[0029] Figure 4 For the present invention Figure 3 A in the middle is an enlarged structural diagram;

[0030] Figure 5 This is a schematic diagram of the overall cross-sectional structure of the bag dust collector of the present invention after it is lowered;

[0031] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0032] Figure 7 For the present invention Figure 5Schematic diagram of the enlarged structure at position C;

[0033] Figure 8 For the present invention Figure 5 Schematic diagram of the enlarged structure at position D;

[0034] Figure 9 Schematic diagram of the structure at the expansion slot of the present invention.

[0035] In the figure: 1, housing; 2, water tank; 3, rotating shaft; 4, demisting cover; 5, demisting component; 6, bag filter; 7, sealing baffle; 8, triggering component; 9, switching rotating shaft; 10, stirring component; 11, pulse cylinder; 12, pulse piston; 13, pulse component; 14, support frame; 21, air inlet; 22, water inlet; 23, drain outlet; 51, driving gear; 52, driven gear; 53, spiral blade; 54, demisting outlet; 81, triggering groove; 82, triggering spring; 83, triggering rod; 84, triggering push block; 85, sealing unit; 851, sealing groove; 852, sealing push block; 853, sealing spring; 854, movable communication groove; 855, fixed communication groove; 71, dust guiding chamfer; 841, support section; 842, pressing section; 101, internal gear ring; 102, internal rotating groove; 103, external rotating pin; 104, pressing groove; 105, pressing baffle; 106, pressing spring; 107, synchronous retaining ring; 108, stirring rod; 131, lifting block; 132, insertion slot; 133, insertion spring; 134, insertion block; 135, insertion joint; 136, lifting guide groove; 1361, joint groove; 1362, expansion slot; 121, pulse spring. Detailed implementation manners

[0036] In order to clearly and completely describe the technical solutions in the embodiments of the present invention, and make the features and advantages more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1

[0038] Please refer to Figures 1 to 5, the present invention provides a multi-stage dust removal device for a grain dryer, which includes a housing 1, a water tank 2, a rotating shaft 3, a demisting hood 4, a demisting component 5, a bag filter 6, a sealing baffle 7, a triggering component 8, a switching rotating shaft 9, a stirring component 10, a pulse cylinder 11, a pulse piston 12 and a pulse component 13. The water tank 2 is arranged at the bottom of the housing 1, and a demisting hood 4 is arranged above the water tank 2. The rotating shaft 3 is connected to the center of the demisting hood 4. The demisting component 5 is arranged at the upper end of the demisting hood 4 and is used to drive the rotating shaft 3 to rotate to demist the gas above the water tank 2. The bag filter 6 is slidably connected in the housing 1. The sealing baffle 7 is arranged between the demisting hood 4 and the housing 1. The triggering component 8 is used to monitor the dust removal situation of the bag filter 6 and make it fall rapidly when it is overweight, and cooperate with the sealing baffle 7 to conduct the bag filter 6 with the water tank 2. A support frame 14 is arranged in the center of the bag filter 6. The switching rotating shaft 9 is rotatably connected in the support frame 14. The stirring component 10 is arranged at the lower end of the switching rotating shaft 9 and is used to push the rotating shaft 3 downward into the water tank 2 for stirring after the bag filter 6 falls. The pulse cylinder 11 is arranged at the upper end of the sliding groove. The pulse piston 12 is slidably connected in the pulse cylinder 11. When the switching rotating shaft 9 rotates, the pulse component 13 drives the pulse piston 12 to slide up and down in the pulse cylinder 11 to pulse clean the bag filter 6 below.

[0039] An air inlet 21 and a water inlet 22 are arranged at the left end of the water tank 2, and a drain outlet 23 is arranged at the right end of the water tank 2. The gas discharged from the dryer is introduced into the water in the water tank 2 through the air inlet 21 for cooling and dust removal, preventing the gas discharged from the dryer from having too high a temperature and too high a dust concentration, which may cause a dust storm. By continuously introducing unfiltered water through the water inlet 22, a drain outlet 23 is arranged at the right end of the water tank 2. After dust removal, the liquid containing dust and having a certain temperature is discharged from the drain outlet 23.

[0040] The demisting component 5 includes a driving gear 51, a driven gear 52 and a spiral blade 53. The driving gear 51 is arranged at the upper end of the demisting hood 4 and is driven to rotate by a motor (not shown in the figure, and the motor can be arranged on the demisting hood 4). At the lower end corresponding to the driving gear 51, the driven gear 52 is connected to the rotating shaft 3. The driven gear 52 meshes with the driving gear 51. The spiral blade 53 is arranged in the middle of the rotating shaft 3. A demisting outlet 54 is opened at the upper end of the demisting hood 4.

[0041] Working principle: When it is necessary to remove dust from the soot discharged from the dryer, the high-temperature gas with a certain dust content in the dryer is introduced into the water tank 2. The liquid in the water tank 2 cools down and preliminarily removes dust, effectively preventing the gas just introduced into the dust collector from causing a dust explosion due to high temperature and excessive dust content. By setting a demisting cover 4 above the water tank 2, the humid gas flowing through the water tank 2 passes through the bottom of the dust removal cover, and the driving gear 51 is driven to rotate by the motor. The rotation of the driving gear 51 drives the driven gear 52 to rotate, and the rotation of the driven gear 52 drives the rotating shaft 3 and the spiral blade 53 to rotate, thereby centrifugally dehumidifying the humid gas passing through the inside of the dust removal cover, making the heavier water vapor be thrown to the inner wall outside the dust removal cover and slide down along the inner wall of the dust removal cover into the water tank 2, while the lighter gas enters the upper bag filter 6 along the demisting outlet 54 at the top of the dust removal cover. The bag filter 6 further removes finer soot in the gas, preventing the gas after being cooled by the water tank 2 from containing water vapor and causing the phenomenon of bag clogging in the bag filter 6, enabling the multi-stage dust removal device for grain dryers to prevent the risk of dust explosion due to the characteristics of high temperature and high concentration of the gas discharged from the dryer, and at the same time, it can also achieve the effect of first cooling the water vapor in the dust-containing gas, then dehydrating and then performing fine dust removal, ensuring the dust removal effect and dust removal safety.

[0042] Embodiment 2

[0043] Please refer to Figures 2 to 7 , a multi-stage dust removal device for a grain dryer is provided, including a trigger component 8. The trigger component 8 includes a trigger groove 81, a trigger spring 82, a trigger rod 83, a trigger push block 84 and a sealing unit 85. The trigger groove 81 is opened in the housing 1, and the bag filter 6 is slidably connected to the trigger groove 81. Both ends of the trigger spring are connected to the lower end of the bag filter 6 and the inner wall of the housing 1 respectively. The trigger rod 83 is fixedly connected to the lower end of the bag filter 6. The trigger push block 84 is fixed to the lower end of the trigger rod 83. The sealing unit 85 is arranged below the trigger push block 84, and is used to push the sealing baffle 7 to the right when the bag filter 6 descends.

[0044] The lower end of the bag filter 6 contains a plurality of bags. There are also multiple groups of trigger rods 83 arranged at the lower end of the bag filter 6. A set of trigger blocks, sealing units 85, etc. are correspondingly arranged at the lower end of each group of trigger rods 83. Only a set of components corresponding to the lower end of a group of trigger rods 83 is shown in the figure as an example.

[0045] The sealing unit 85 includes a sealing groove 851, a sealing push block 852, a sealing spring 853, a movable communication groove 854 and a fixed communication groove 855. The sealing groove 851 is formed in the dust removal cover and the housing 1. The sealing baffle 7 is slidably connected in the sealing groove 851. The sealing push block 852 is connected to the left end of the sealing baffle 7. Both ends of the sealing spring 853 are connected to the right end of the sealing push block 852 and the inner wall of the housing 1 respectively. The movable communication groove 854 is formed in the sealing baffle 7. The fixed communication groove 855 is formed in the upper end of the dust removal cover. The trigger push block 84 cooperates with the sealing push block 852. Here, the cooperation means that when the bag filter 6 is in the dust removal process, due to the purification of the gas, more and more dust will adhere to the surface of the filter bag, making the overall weight of the bag filter 6 heavier and heavier. As a result, the bag filter 6 will gradually move downward with the trigger block, squeezing the trigger spring 82. When the bag filter 6 moves downward, it will drive the trigger push block 84 to move downward, and then the sealing push block 852 will slide to the right along the lower right corner bevel of the trigger push block 84, squeezing the sealing spring 853. The movable communication groove 854 cooperates with the fixed communication groove 855. Here, the cooperation means that when the sealing spring 853 is not in the compressed state, the movable communication groove 854 on the sealing baffle 7 is located above the left of the fixed communication groove 855. When the sealing spring 853 is completely compressed due to the rightward movement of the sealing push block 852, at this time, the movable communication groove 854 on the sealing push block 852 communicates with the fixed communication groove 855, and the right end of the sealing push block 852 blocks the demisting outlet 54.

[0046] A dust attracting chamfer 71 is provided at the right end of the sealing baffle 7. When the movable communication groove 854 communicates with the fixed communication groove 855 and the bag filter 6 performs pulse dust removal and ash cleaning, the dust attracting chamfer 71 can introduce the dust from the dust attracting chamfer 71 along the movable communication groove 854 and the fixed communication groove 855 into the water tank 2 from the bag filter 6, making it easier for the dust to be adsorbed and collected by water and facilitating cleaning.

[0047] The trigger push block 84 includes a support section 841 and a downward pressure section 842. The support section 841 is arranged at the lower right end of the trigger push block 84. The downward pressure section 842 is connected to the upper right end of the support section 841. The angle between the support section 841 and the horizontal line is less than 45°. Both the support section 841 and the downward pressure section 842 cooperate with the sealing push block 852. The purpose of this design is that during the use of the bag filter 6, as the gas is purified and dust is removed, more and more soot adheres to the filter bag, making the overall weight of the bag filter 6 heavier and heavier, and the dust removal effect of the filter bag is getting worse and worse until it cannot meet the speed of flue gas dust removal. At this time, enough dust has accumulated on the bag filter 6, and it is necessary to perform a pulse to clean the dust on the filter bag. During the process of the bag filter 6 getting heavier during use, the design with the angle between the support section 841 and the horizontal line less than 45° can cause most of the gravity to be offset by the upward supporting force of the sealing push block 852 during the process of the bag filter 6 getting heavier, and only a small part of the component force is conducted to the right to the sealing push block 852, so that during the process of the bag filter 6 getting heavier until it needs to be cleaned, it can only drive the sealing push block 852 to move slightly to the right, and the bag filter 6 moves slightly downward. The sealing baffle 7 at the lower end of the sealing push block 852 will not affect the opening degree of the demisting outlet 54, and at the same time, the internal gear ring 101 at the lower end of the bag filter 6 will not fit with the outer rotating pin 103; when the overall dust content of the bag filter 6 reaches the weight that needs to be cleaned, at this time, the support section 841 of the trigger push block 84 pushes the sealing push block 852 to the downward pressure section 842. The angle between the downward pressure section 842 and the horizontal line is greater than 45°. This design can cause most of the gravity component force of the bag filter 6 to be conducted to the right to the sealing push block 852, enabling the sealing push block 852 to quickly move to the right and compress the sealing spring 853, and at the same time enabling the bag filter 6 to move downward more smoothly. Finally, the sealing push block 852 drives the sealing baffle 7 to move to the right to block the demisting outlet 54, and the fixed communication groove 855 is communicated with the movable communication groove 854, and the internal gear ring 101 and the internal rotating groove 102 move downward to cooperate with the outer rotating pin 103 and the driving gear 51.

[0048] The stirring component 10 includes an internal gear ring 101, an internal rotating groove 102, an external rotating pin 103, a downward pressing groove 104, a downward pressing baffle 105, a downward pressing spring 106, a synchronous retaining ring 107, and a stirring rod 108. The internal gear ring 101 is fixedly connected to the lower end of the switching rotating shaft 9. The internal rotating groove 102 is opened at the center of the lower end of the switching rotating shaft 9. The external rotating pin 103 is arranged at the upper end of the rotating shaft 3. The external rotating pin 103 cooperates with the internal rotating groove 102. Herein, the cooperation means that when the trigger push block 84 of the bag filter 6 moves downward along the downward pressing section 842, the bag filter 6 first drives the lower switching rotating shaft 9 to move downward, so that the internal rotating groove 102 at the center of the switching rotating shaft 9 first fits and inserts with the external rotating pin 103. And as the bag filter 6 continues to move downward, the switching rotating shaft 9 pushes the rotating shaft 3 downward, causing the driven gear 52 to disengage from the driving gear 51. At the same time, the downward pressing baffle 105 squeezes the downward pressing spring 106, and the stirring rod 108 at the lower end of the rotating shaft 3 extends into the water tank 2. The internal gear ring 101 cooperates with the driving gear 51. After the external rotating pin 103 is inserted into the internal rotating groove 102, during the process that the switching rotating shaft 9 continues to move downward, the internal gear ring 101 will gradually engage with the driving gear 51. The downward pressing groove 104 is opened in the demister cover 4. The downward pressing baffle 105 is fixedly connected to the rotating shaft 3. The synchronous retaining ring 107 is slidably connected to the rotating shaft 3 in the up and down direction. The synchronous retaining ring 107 is connected to the rotating shaft 3 through a key groove (not shown in the figure here). Through the connection of the key groove, when the rotating shaft 3 rotates, it can drive the synchronous retaining ring 107 to rotate together. At the same time, when the rotating shaft 3 slides up and down, the synchronous retaining ring 107 can slide relative to the rotating shaft 3 in the up and down direction. The two ends of the downward pressing spring 106 are respectively connected to the lower end of the downward pressing baffle 105 and the upper end of the synchronous retaining ring 107. The stirring rod 108 is arranged at the lower end of the rotating shaft 3. The stirring rod 108 cooperates with the water tank 2. Herein, the cooperation means that when the driven gear 52 is engaged with the driving gear 51, the stirring rod 108 does not contact the water in the water tank 2, so that when the rotating shaft 3 drives the spiral blade 53 to rotate rapidly for demisting, the stirring rod 108 will not be inserted into the water, resulting in resistance and preventing the spiral blade 53 from rotating rapidly, or increasing the energy consumption of the motor. After the driven gear 52 disengages from the driving gear 51 and the driving gear 51 engages with the internal gear ring 101, the stirring rod 108 is inserted into the water. At the same time, due to the transmission ratio between the driving gear 51 and the internal gear ring 101, the stirring rod 108 can more easily stir the water in the water tank 2 slowly, preventing the dust falling into the water from only floating on the surface of the water during pulse dust cleaning.

[0049] The remaining structures are the same as those in Embodiment 1.

[0050] Working principle: When the bag filter 6 removes dust from the demisted gas, the filter bags on the bag filter 6 will block the tiny dust in the gas on the outside of the filter bags and discharge the dust-removed gas from above the bag filter 6. During the dust removal process of the bag filter 6, the bag filter 6 will block the dust. As the gas is purified, more and more dust will adhere to the surface of the filter bags, making the overall weight of the bag filter 6 heavier and heavier. When it accumulates to a certain amount, the bag filter 6 will gradually move downward with the trigger block to squeeze the trigger spring 82. When the bag filter 6 moves downward, it will drive the trigger push block 84 to move downward, and then make the sealing push block 852 slide to the right along the right lower corner hypotenuse of the trigger push block 84 to squeeze the sealing spring 853. Until the overall weight of the bag filter 6 reaches the time when it needs to be cleaned, at this time, the support section 841 of the trigger push block 84 pushes the sealing push block 852 to the downward pressure section 842. The sealing push block 852 can quickly move to the right to squeeze the sealing spring 853, and at the same time make the bag filter 6 move downward more smoothly. Finally, the sealing push block 852 drives the sealing baffle 7 to move to the right to block the demisting outlet 54, and the fixed communication groove 855 is communicated with the movable communication groove 854. The z internal gear ring 101 and the internal rotation groove 102 move downward to cooperate with the external rotation pin 103 and the driving gear 51.

[0051] When the trigger push block 84 of the bag filter 6 moves downward along the downward pressure section 842, the bag filter 6 first drives the switching rotating shaft 9 at the lower end to move downward, so that the internal rotation groove 102 at the center of the switching rotating shaft 9 first fits and inserts with the external rotation pin 103. As the bag filter 6 continues to move downward, the switching rotating shaft 9 pushes the rotating shaft 3 downward, so that the downward pressure baffle 105 squeezes the downward pressure spring 106, making the driven gear 52 disengage from the driving gear 51. The stirring rod 108 at the lower end of the rotating shaft 3 extends into the water tank 2. After the external rotation pin 103 is inserted into the internal rotation groove 102, during the process of the switching rotating shaft 9 continuing to move downward, the internal gear ring 101 will gradually mesh with the driving gear 51.

[0052] Under the working condition of dust removal by the bag filter 6, the driving gear 51 meshes with the driven gear 52, and the stirring rod 108 is not inserted into the water in the water tank 2. When the motor drives the driving gear 51 to rotate, it can drive the driven gear 52 to rotate rapidly, and then make the spiral blade 53 rotate rapidly for demisting; Under the working condition that the bag filter 6 needs to be cleaned, the driven gear 52 disengages from the driving gear 51, the stirring rod 108 is inserted into the water in the water tank 2, and the driving gear 51 meshes with the internal gear ring 101. At this time, the motor drives the driving gear 51 to rotate, the driving gear 51 drives the internal gear ring 101 to rotate, the internal gear ring 101 rotates to drive the switching rotating shaft 9 to rotate, and then makes the external rotating pin 103 inserted into the internal rotating groove 102 rotate, so that the external rotating pin 103 drives the rotating shaft 3 and the stirring rod 108 to rotate. Since the radius of the internal gear ring 101 is larger, when the driving gear 51 drives the internal gear ring 101 to rotate, although the rotation speed of the internal gear ring 101 is slower, it has a greater rotational force. Therefore, it can slowly drive the stirring rod 108 to stir the water in the water tank 2. Then, when the bag filter 6 performs pulse cleaning, the dust blown off from the bag filter 6 falls onto the water surface and is mixed with the stirring of the stirring rod 108, preventing the water from being too calm, and the dust will only float on the surface layer of the water, which is not conducive to the fusion and collection of the dust. When the bag filter 6 performs pulse dust removal and cleaning, the cleaned ash is dissolved in the water, which is convenient for collection and discharge, preventing the dust from flying again during the cleaning process and being difficult to clean.

[0053] Embodiment 3

[0054] Please refer to Figures 5 to 8, a multi - stage dust removal device for a grain dryer is provided, including a pulse component 13. The pulse component 13 includes a lifting block 131, a plug - in slot 132, a plug - in spring 133, a plug - in block 134, a plug - in head 135, a lifting guide groove 136 and a connecting rod 137. The lifting block 131 is slidably connected in the switching rotating shaft 9. The plug - in slot 132 is opened in the lifting block 131. The plug - in block 134 is slidably connected in the plug - in slot 132. Both ends of the plug - in spring 133 are respectively connected to the right end of the plug - in block 134 and the inside of the lifting block 131. The plug - in head 135 is arranged at the left end of the plug - in block 134. The lifting guide groove 136 is opened in the switching rotating shaft 9. A joint groove 1361 is opened on one side of the lifting guide groove 136 away from the center of the switching rotating shaft 9. The joint groove 1361 cooperates with the plug - in head 135. Expansion grooves 1362 are opened at both the head and the tail of the lifting guide groove 136. The expansion grooves 1362 cooperate with the plug - in head 135. The diameter of the plug - in head 135 is larger than that of the plug - in block 134. The opening size of the lifting guide groove 136 matches the diameter of the plug - in block 134. The opening size of the joint groove 1361 matches the plug - in head 135. The expansion grooves 1362 communicate with the joint groove 1361. The purpose of this design is that the plug - in head 135 can enter the joint groove 1361 from the lower expansion groove 1362. With the rotation of the switching rotating shaft 9, under the action of the lifting guide groove 136 and the limitation of the limiting groove, the plug - in head 135, the plug - in block 134 and the lifting block 131 can move upward along the lifting guide groove 136, and the pulse piston 12 is moved upward to compress the pulse spring 121. When moving to the upper expansion groove 1362, the plug - in head 135 moves out of the plug - in slot 132 along the expansion groove 1362 and compresses the plug - in spring 133. Then the pulse spring 121 resets. Under the action of the pulse spring 121, the pulse piston 12 moves downward, driving the lifting block 131, the plug - in spring 133, the plug - in block 134 and the plug - in head 135 to move downward. During the downward movement of the plug - in head 135, it fits with the inner wall of the switching rotating shaft 9. Even if it contacts the lifting guide groove 136 during the downward movement, it will not be inserted into the lifting guide groove 136 because the diameter of the plug - in head 135 is larger than the opening size of the lifting guide groove 136, enabling the lifting block 131 to move downward smoothly until the plug - in block 134 drives the plug - in head 135 to move to the lower expansion groove 1362 again, and the plug - in head 135 can be inserted into the joint groove 1361 under the action of the plug - in spring 133. A limiting groove is opened in the center of the bag filter 6. The connecting rod 137 is slidably connected with the limiting groove. The limiting groove is a polygonal groove body. The shape of the connecting rod 137 matches that of the polygonal groove body, which can play a role in circumferentially limiting the connecting rod 137 and preventing the connecting rod 137 and the lifting block 131 below it from rotating. The upper end of the connecting rod 137 is connected to the pulse piston 12. A pulse spring 121 is arranged at the upper end of the pulse piston 12. The upper end of the pulse spring 121 abuts against the inner wall of the pulse cylinder 11.

[0055] An air hole is provided at the top of the shell pulse cylinder 11, and a pressure sensor and an air pump can be provided at the air hole to assist in pushing the piston downward during pulse dust removal to ensure sufficient air pressure during pulse dust removal.

[0056] The remaining structures are the same as those in Embodiment 2.

[0057] Working principle: When the weight of the bag filter 6 reaches the working condition that needs to be cleaned, the outer rotating pin 103 is connected to the inner rotating groove 102, the motor rotates to drive the driving gear 51 to rotate, the driving gear 51 rotates to drive the inner rotating ring to rotate, the inner rotating ring rotates to drive the switching rotating shaft 9 to rotate. As the switching rotating shaft 9 rotates, under the action of the lifting guide groove 136 and the limitation of the connecting rod 137 in the limiting groove, the plug joint 135, the plugging block 134 and the lifting block 131 can move upward along the lifting guide groove 136, and the pulse piston 12 is pushed upward to compress the pulse spring 121. When moving to the upper expansion groove 1362, the plug joint 135 moves out of the plugging groove 132 along the expansion groove 1362 and compresses the plugging spring 133. Subsequently, the pulse spring 121 resets. Under the action of the pulse spring 121, the pulse piston 12 moves downward, and the bag filter 6 is dust-removed by using air pressure, and the dust attached to the outer side of the bag is blown off into the water tank 2. Under the rotation of the stirring rod 108, the dust is mixed with water and discharged through the drain port 23. While the pulse dust removal of the bag is realized, the dust is mixed and stirred with the water in the water tank 2 to prevent the blown-off dust from splashing and being difficult to collect and clean. The design of the stirring rod 108 can make the dust and water blend better, preventing the dust from only floating on the surface of the water.

[0058] During the downward movement of the pulse piston 12, the connecting rod 137 drives the lifting block 131, the insertion spring 133, the insertion block 134 and the insertion joint 135 to move downward. During the downward movement, the insertion joint 135 fits against the inner wall of the switching rotating shaft 9. Even if it contacts the lifting guide groove 136 during the downward movement, it will not be inserted into the lifting guide groove 136 because the diameter of the insertion joint 135 is larger than the opening size of the lifting guide groove 136, enabling the lifting block 131 to move downward smoothly until the insertion block 134 moves to the lower expansion groove 1362 again. The insertion joint 135 can be inserted into the joint groove 1361 under the action of the insertion spring 133. If the mass of the bag filter 6 is still relatively large and the dust on the bag has not been completely cleaned, the lower sealing push block 852 of the bag filter 6 is still located in the downward pressure section 842. At this time, the rotation of the driving gear 51 will still drive the internal gear ring 101 to rotate, thereby driving the trigger cylinder to rotate, and the piston will reciprocate to clean the ash again. During this process, since the angle between the downward pressure section 842 and the horizontal line is greater than 45°, even if part of the dust has been cleaned from the bag filter 6 due to a slight reduction in its mass, only a small part of the restoring force of the sealing spring 853 to the left can overcome the mass of the bag filter 6 upward under the action of the downward pressure section 842. Thus, it can be ensured that after the bag filter 6 has achieved a complete ash cleaning effect under the action of pulse dust removal and becomes light enough, the sealing push block 852 can push the bag filter 6 upward along the downward pressure section 842 to the support section 841 under the action of the sealing spring 853 and continue to push the bag filter 6 to the upper end along the support section 841, ensuring the cleaning effect of the bag filter 6.

[0059] Embodiment 4

[0060] A dust removal method is provided, including the multi-stage dust removal device for a grain dryer in the above embodiment, and the following method: The gas discharged from the dryer is introduced into the water tank 2 for water cooling and preliminary large-particle dust removal.

[0061] The cooled gas above the water tank 2 is centrifugally separated to remove water vapor through the demisting cover 4.

[0062] The cooled and dehumidified gas in the demisting cover 4 is conveyed to the bag filter 6 through the spiral blade 53 and the demisting outlet 54.

[0063] The cooled and dehumidified gas is further finely dust-removed by the bag filter 6 and then discharged.

[0064] When a certain amount of dust accumulates in the bag filter 6, the upper end of the demisting cover 4 is sealed by the sealing baffle 7, and the dust collector is connected to the water tank 2.

[0065] The dust on the bag of the bag filter 6 is blown into the water tank 2 by pulse dust removal.

[0066] The liquid in the water tank 2 is stirred by the stirring rod 108 so that the dust blown into the water tank 2 is mixed with the liquid;

[0067] The liquid mixed with the dust is discharged through the water outlet to complete the pulse dust removal cleaning of the cloth bag.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A multi-stage dust removal device for a grain dryer, characterized in that: It includes a housing (1), a water tank (2), a rotating shaft (3), a demisting cover (4), a demisting component (5), a bag filter (6), a sealing baffle (7), a triggering component (8), a switching rotating shaft (9), a stirring component (10), a pulse cylinder (11), a pulse piston (12), and a pulse component (13). The water tank (2) is provided at the bottom of the housing (1). The demisting cover (4) is arranged above the water tank (2). The rotating shaft (3) is connected to the center of the demisting cover (4). The demisting component (5) is provided at the upper end of the demisting cover (4). The demisting component (5) is used to drive the rotating shaft (3) to rotate for demisting the gas above the water tank (2). The bag filter (6) is slidably connected inside the housing (1). The sealing baffle (7) is arranged between the demisting cover (4) and the housing (1). The triggering component (8) is used to monitor the dust removal situation of the bag filter (6) and make it fall rapidly when it is overweight, and cooperate with the sealing baffle (7) to conduct the bag filter (6) with the water tank (2). A support frame (14) is provided in the center of the bag filter (6). The switching rotating shaft (9) is rotatably connected inside the support frame (14). The stirring component (10) is arranged at the lower end of the switching rotating shaft (9), and it is used to push the rotating shaft (3) downward and insert it into the water tank (2) for stirring after the bag filter (6) falls. The pulse cylinder (11) is arranged at the upper end of the sliding groove. The pulse piston (12) is slidably connected inside the pulse cylinder (11). When the switching rotating shaft (9) rotates, the pulse component (13) drives the pulse piston (12) to slide up and down inside the pulse cylinder (11) to conduct pulse cleaning on the bag filter (6) below.

2. The multi-stage dust removal device for a grain dryer according to claim 1, wherein: An air inlet (21) and a water inlet (22) are provided at the left end of the water tank (2), and a drain outlet (23) is provided at the right end of the water tank (2).

3. The multi-stage dust removal device for a grain dryer according to claim 1, wherein: The demisting component (5) includes a driving gear (51), a driven gear (52), and a spiral blade (53). The driving gear (51) is arranged at the upper end of the demisting cover (4) and is driven to rotate by a motor. The driven gear (52) is connected to the rotating shaft (3). The driven gear (52) meshes with the driving gear (51). The spiral blade (53) is arranged in the middle of the rotating shaft (3). A demisting outlet (54) is provided at the upper end of the demisting cover (4).

4. The multi-stage dust removal device for a grain dryer according to claim 3, characterized in that: The triggering component (8) includes a triggering groove (81), a triggering spring (82), a triggering rod (83), a triggering push block (84), and a sealing unit (85). The triggering groove (81) is provided inside the housing (1). The bag filter (6) is slidably connected with the triggering groove (81). Both ends of the triggering spring are respectively connected to the lower end of the bag filter (6) and the inner wall of the housing (1). The triggering rod (83) is fixedly connected to the lower end of the bag filter (6). The triggering push block (84) is fixed to the lower end of the triggering rod (83). The sealing unit (85) is arranged below the triggering push block (84), and it is used to push the sealing baffle (7) to the right when the bag filter (6) descends.

5. The multi-stage dust removal device for a grain dryer according to claim 4, characterized in that: The sealing unit (85) includes a sealing groove (851), a sealing push block (852), a sealing spring (853), a movable communication groove (854), and a fixed communication groove (855). The sealing groove (851) is formed in the dust removal cover and the housing (1). The sealing baffle (7) is slidably connected in the sealing groove (851). The sealing push block (852) is connected to the upper left end of the sealing baffle (7). Both ends of the sealing spring (853) are connected to the right end of the sealing push block (852) and the inner wall of the housing (1) respectively. The movable communication groove (854) is formed in the sealing baffle (7). The fixed communication groove (855) is formed at the upper end of the dust removal cover. The trigger push block (84) cooperates with the sealing push block (852), and the movable communication groove (854) cooperates with the fixed communication groove (855).

6. The multi-stage dust removal device for a grain dryer according to claim 5, wherein: A dust attracting chamfer (71) is provided at the right end of the sealing baffle (7).

7. The multi-stage dust removal device for a grain dryer according to claim 5, characterized in that: The trigger push block (84) includes a support section (841) and a pressing section (842). The support section (841) is provided at the lower right end of the trigger push block (84). The pressing section (842) is connected to the upper right end of the support section (841). The angle between the support section (841) and the horizontal line is less than 45°. The angle between the pressing section (842) and the horizontal line is greater than 45°. Both the support section (841) and the pressing section (842) cooperate with the sealing push block (852).

8. The multi-stage dust removal device for a grain dryer according to claim 5, characterized in that: The stirring member (10) includes an internal gear ring (101), an internal rotating groove (102), an external rotating pin (103), a pressing groove (104), a pressing baffle (105), a pressing spring (106), a synchronous retaining ring (107), and a stirring rod (108). The internal gear ring (101) is fixedly connected to the lower end of the switching rotating shaft (9). The internal rotating groove (102) is formed at the center of the lower end of the switching rotating shaft (9). The external rotating pin (103) is provided at the upper end of the rotating shaft (3). The external rotating pin (103) cooperates with the internal rotating groove (102). The internal gear ring (101) cooperates with the driving gear (51). The pressing groove (104) is formed in the demisting cover (4). The pressing baffle (105) is fixedly connected to the rotating shaft (3). The synchronous retaining ring (107) is slidably connected to the rotating shaft (3) in the vertical direction. Both ends of the pressing spring (106) are connected to the lower end of the pressing baffle (105) and the upper end of the synchronous retaining ring (107) respectively. The stirring rod (108) is provided at the lower end of the rotating shaft (3). The stirring rod (108) cooperates with the water tank (2).

9. The multi-stage dust removal device for a grain dryer according to claim 8, wherein: The pulse component (13) includes a lifting block (131), a plugging groove (132), a plugging spring (133), a plugging block (134), a plugging head (135), a lifting guide groove (136) and a connecting rod (137). The lifting block (131) is slidably connected in the switching rotating shaft (9). The plugging groove (132) is formed in the lifting block (131). The plugging block (134) is slidably connected in the plugging groove (132). Two ends of the plugging spring (133) are respectively connected to the right end of the plugging block (134) and the inside of the lifting block (131). The plugging head (135) is arranged at the left end of the plugging block (134). The lifting guide groove (136) is formed in the switching rotating shaft (9). A joint groove (1361) is formed on one side of the lifting guide groove (136) away from the center of the switching rotating shaft (9). The joint groove (1361) cooperates with the plugging head (135). Expansion grooves (1362) are formed at the head and tail ends of the lifting guide groove (136). The expansion grooves (1362) cooperate with the plugging head (135). A limiting groove is formed in the center of the bag filter (6). The connecting rod (137) is slidably connected with the limiting groove. The upper end of the connecting rod (137) is connected to the pulse piston (12). A pulse spring (121) is arranged at the upper end of the pulse piston (12). The upper end of the pulse spring (121) abuts against the inner wall of the pulse cylinder (11).

10. A dust removal method, characterized in that: Comprising the multi-stage dust removal device for a grain dryer according to any one of claims 1 to 9; and the following method, By introducing the gas discharged from the dryer into the water tank (2) for water-cooling and temperature reduction, and performing preliminary large-particle dust removal; By using the demisting cover (4) to centrifugally separate and remove water vapor from the cooled gas above the water tank (2); By using the spiral blade (53) and the demisting outlet (54) to convey the cooled and dehumidified gas in the demisting cover (4) into the bag filter (6); By using the bag filter (6) to further remove fine dust from the cooled and dehumidified gas and then discharging it; By using the sealing baffle (7) to seal the upper end of the demisting cover (4) after a certain amount of dust accumulates in the bag filter (6), and connecting the dust collector and the water tank (2); By pulse dust removal to blow the dust on the cloth bag of the bag filter (6) into the water tank (2); By using the stirring rod (108) to stir the liquid in the water tank (2) so that the dust blown into the water tank (2) is mixed with the liquid; By discharging the liquid mixed with the dust through the water outlet to complete the pulse dust removal cleaning of the cloth bag.

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