Multi-stage filtering dust removal structure based on cloth bag and automatic dust removal equipment

Abstract

The invention discloses a multi-stage filtering dust removal structure based on a cloth bag and automatic dust removal equipment, and belongs to the technical field of cloth bag dust removal. Through the arrangement of a double-layer and staggered cloth bag structure, large-amplitude shaking occurs under the pulse of the two groups of stamping nozzles, friction and collision with a certain frequency are generated between the inner bag and the outer bag, in combination with flapping generated by shaking of a spiral rod in the cloth bag, falling of dust on the cloth bag is accelerated, and the dust cleaning efficiency is improved. A plurality of transverse rods are installed at the position, close to the top, in the box body, buckle assemblies and pressing blocks are arranged in the transverse rods, detachable U-shaped fasteners are connected to the lower portions of the transverse rods through the buckle assemblies, two buckle rings are arranged in the U-shaped fasteners, the double-layer dust removal cloth bag comprises an outer bag and an inner bag, a dust removal assembly is hung in the inner bag, and a first pulse assembly and a second pulse rod assembly are arranged in the box body. The first pulse nozzle faces downwards and is close to an upper bag opening of the double-layer dust collecting bag, and the second pulse nozzle faces upwards and is close to the upper one-third position of the double-layer dust collecting bag.

Description

Technical Field

[0001] The present invention relates to the technical field of bag dust cleaning, and specifically relates to a multi-stage filtration and dust removal structure based on a bag and an automatic dust cleaning device. Background Art

[0002] Traditional bag dust collectors mostly adopt a single-stage filtration structure, and dust directly impacts the surface of the bag, which is likely to cause clogging of the filter bag and an increase in differential pressure. It is necessary to frequently stop the machine for dust cleaning, affecting production efficiency. Therefore, automatic dust cleaning technologies such as pulse blowing on the bag are equipped. Although it can reduce manual intervention, there are still problems. Although the pulse can play a certain role in dust cleaning, due to the problem of the bag length, the dust cleaning effect is relatively good near the pulse nozzle, while it cannot achieve a good dust cleaning effect at a far distance.

[0003] Therefore, how to achieve a better dust cleaning effect for the bag is a technical problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-stage filtration and dust removal structure based on a bag and an automatic dust cleaning device. By changing the original single-layer dust removal bag with poor dust removal effect to a double-layer structure of an outer bag and an inner bag, and staggering the outer bag and the inner bag, when hanging, two groups of pulse components are used to perform bidirectional pulses on the bag, so that the outer bag and the inner bag of the inner and outer layers are affected by the airflow and air pressure changed by the pulse, causing them to sway and swing, generating a certain amount of friction and collision. At the same time, a spiral rod arranged inside the inner bag can generate a certain frequency of knocking and patting from the inside of the bag due to the shaking, accelerating the falling of the dust attached to the surface of the bag, thereby improving the dust cleaning effect.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A multi-stage filtration and dust removal structure based on a bag and an automatic dust cleaning device, including a box body. Inside the box body, multiple cross bars are installed near the top. Each cross bar is provided with a buckle assembly and a pressing block inside. Below the cross bar, a detachable U-shaped fastener is connected through the buckle assembly. Two buckle rings are arranged inside the U-shaped fastener;

[0006] The U-shaped fastener hangs a double-layer dust removal bag through the buckle ring. The double-layer dust removal bag includes an outer bag and an inner bag and is arranged in a staggered manner. The filter mesh density of the outer bag is lower than that of the inner bag. A dust cleaning component is hung inside the inner bag;

[0007] Inside the box body, a first pulse component and a second pulse rod group are provided. The first pulse component includes ventilation rods fixed on both sides of the inner wall of the box body and multiple first pulse nozzles connected below the ventilation rods. The nozzles of the first pulse nozzles face downward and are close to the upper bag mouth of the double-layer dust removal bag. The second pulse rod group includes a collar installed on the inner wall of the box body and multiple second pulse nozzles. The nozzles of the second pulse nozzles face upward and are close to the upper one-third of the double-layer dust removal bag;

[0008] By adopting the above technical solution, the original single-layer dust removal cloth bag is changed to a double-layer one to improve the cleaning efficiency during dust removal. Moreover, according to the material differences between the outer bag and the inner bag, it can meet the needs of dust removal for different dusts. Since the wind blows at different upper and lower positions of the double-layer dust removal cloth bag, the swaying effects are different. Therefore, the second pulse rod group is installed at the position one-third above the double-layer dust removal cloth bag. If it is set too low, it will only affect the swaying amplitude of the cloth bag, and the space at the lower opening of the cloth bag will be severely squeezed and deformed under the pressure of the wind, resulting in the dust not being able to fall smoothly due to the narrowing of the bag opening when falling, affecting the ash cleaning effect. When the nozzle piece is set too high, through the flexible connection structure in the upper half and the flexibility of the suspension method, it can cooperate with the pulse rod group to increase the swaying between the cloth bags under the action of the pulse impact force. At the same time, the opening size of the lower bag opening will not be severely deformed, increasing the impact force between the two cloth bags and not affecting the discharge of dust through the lower bag opening.

[0009] As a preferred technical solution of the present invention, the buckle assembly includes a linkage rod, two insertion blocks and a return spring. One side of multiple cross bars is connected with a micro vibration motor through a box body. The two insertion blocks are symmetrically arranged and are both movably connected to the linkage rod at the rear end. A push rod is provided at the upper end of the button block and is movably connected to the two linkage rods in the cross bar through the push rod. The return spring is fixed on the upper surface of the push rod.

[0010] By adopting the above technical solution, the micro vibration motor can vibrate each cross bar to assist in the ash cleaning operation of the dust removal bag. And by controlling the positions of the two insertion blocks through the button block, the movement track of the linkage rod at the rear end of the insertion block is changed. The set return spring can keep the two insertion blocks in a buckling relationship with the U-shaped fastener when the button block is not pressed. When pressed, the button block drives the linkage rods to tilt upward respectively through the push rod to change the positions of the insertion blocks, forming a buckling function with the state when not pressed, realizing the function of the detachable U-shaped fastener.

[0011] As a preferred technical solution of the present invention, a plug for connecting the button block is provided at the upper end of the U-shaped fastener. Slots for buckling with the insertion blocks are opened on the inner sides of the plugs. The button block is located between the two plugs of the U-shaped fastener;

[0012] By adopting the above technical solution, the U-shaped fastener is buckled with the buckle assembly in the cross bar through the slots on the inner sides of the plugs, which is convenient for later maintenance and replacement. At the same time, in order to realize the staggered position relationship between the inner bag and the outer bag, the two slots in the U-shaped fastener can respectively limit the movement ranges between the inner bag and the outer bag, so that the buckles will not be entangled when they sway, and at the same time, the inner bag and the outer bag maintain a staggered position relationship.

[0013] As a preferred technical solution of the present invention, Pulse Component 1 is connected to the pulse valve through a box body, Pulse Rod Group 2 is connected to the intermittent pulse air valve through a box body, regularly injecting short-time high-speed air flow (pressure 0.3 - 0.6 Mpa), the distance between the nozzle and the filter bag is 50 - 100 mm, and it is aligned with the middle of the filter bag at a 30° oblique angle.

[0014] Adopting the above technical solution, the intermittent pulse air valve controls the intermittent jetting frequency and the jetting duration of Pulse Nozzle 2, enabling Pulse Nozzle 2 to cooperate with Pulse Nozzle 1 for alternating jetting, giving full play to the functions of both Pulse Nozzle 2 and Pulse Nozzle 1, and the two do not affect each other during the jetting operation.

[0015] As a preferred technical solution of the present invention, there are two notches inside the U-shaped fastener, and two buckle rings are respectively located at the two notches. Fixed sleeves are provided at the bag mouths of the outer bag and the inner bag. The fixed sleeves are movably connected to a horizontally rotatable knob through a traction rope. One of the buckle rings is movably connected to the knob. The outer bag is made of polyester film, the inner bag is made of ultra-fine fiber material, and a nano-catalytic layer is coated on the surface.

[0016] Adopting the above technical solution, the outer bag is made of polyester film, the inner bag is made of ultra-fine fiber material, and a nano-catalytic layer is coated on the surface. The outer bag material can be polyester film with a pore diameter of 50 - 100 μm to intercept some large particle dust. The inner bag material can be ultra-fine fiber material with a pore diameter ≤ 10 μm, and a nano-catalytic layer is coated on the surface, which can adsorb PM2.5 and harmful gases.

[0017] As a preferred technical solution of the present invention, the knob is divided into upper and lower parts, and a connecting rod is provided between the upper and lower parts.

[0018] Adopting the above technical solution, the upper and lower parts of the knob can cause the outer bag to twist horizontally during the shaking process, making the double-layer dust filter bag twist, and accelerating the removal of surface dust through the tension during the stretching process.

[0019] As a preferred technical solution of the present invention, the fixed sleeve of the inner bag is connected to a first suspension seat through a traction rope. The upper end of the first suspension seat is connected to an arched suspension rod. The other buckle ring is movably connected to the arched suspension rod. The dust cleaning component is movably connected to the bottom of the first suspension seat;

[0020] Adopting the above technical solution, the inner bag can be arranged with a staggered position from the outer bag through the arched suspension rod, and the connection structure of the inner bag will not intersect with the structure of the outer bag, resulting in entanglement during the swinging process.

[0021] As a preferred technical solution of the present invention, the dust cleaning component includes a second suspension seat and a spiral rod. The second suspension seat and the connecting spiral rod are movably connected through a hanging ring. The second suspension seat is torsionally connected to the first suspension seat. The spiral rod is made of low-density metal material.

[0022] With the above technical solution, since the linear density of the spiral rod is higher than that of the inner bag and the outer bag, the inertial moment during swinging is greater than the swinging between the inner bag and the outer bag. Therefore, high-frequency vibration is generated by the spiral rod under the disturbance of the air flow, forming a composite collision effect with the swinging between the inner bag and the outer bag, significantly improving the surface dust stripping rate.

[0023] A method for using a multi-stage filtration and dust removal structure based on cloth bags and an automatic dust cleaning device includes the following method steps:

[0024] S1. First, set the time for clearing the dust on the cloth bag in the control system of the cloth bag dust removal device according to the dust concentration in the field of use. When the dust removal operation reaches 30 minutes, start the cleaning operation once. Then, send the air containing dust through the exhaust fan at the outer end to the air inlet and into the box body. First, filter the air containing dust with multiple groups of double-layer dust removal cloth bags. The outer bag material of the double-layer dust removal cloth bag is PTEE-coated needle felt with a pore diameter of 50 - 100 μm, which can filter large-particle dust. The inner bag is made of ultra-fine fiber material and coated with a nano-catalytic layer on the surface, which filters relatively fine particles and polluting chemical components in the air.

[0025] S2. When the set clearing time is reached, provide a pulse to Pulse Component 1 by the pulse valve, and blow the double-layer dust removal cloth bag obliquely downward by Pulse Nozzle 1. When blowing, the change in air pressure brought by the wind force causes the inner bag and the outer bag to shake under the action of the suspension parts formed between the snap ring and the knob, Hanger 1 and the bow-shaped suspension rod. When shaking, friction and collision occur between the inner bag and the outer bag, and cooperate with the blowing to accelerate the dust removal.

[0026] S3. When Pulse Component 1 performs pulse blowing, Pulse Component 2 blows alternately with Pulse Component 1 under the control of the intermittent pulse control part. Pulse Nozzle 2 arranged on the collar tilts upward by 30° and blows from one side of the double-layer dust removal cloth bag at a certain frequency. The frequency is 10 - 30 seconds / time, and each time it lasts for 0.2 - 1 second. The change range of its frequency can automatically adjust the intensity of the pulse according to the internal real-time monitored pressure difference. At the same time, driven by the shaking of the double-layer dust removal cloth bag, the spiral rod inside the inner bag shakes under the impact of the air flow due to its own gravity and forms a flapping effect from the inside of the double-layer dust removal cloth bag, thereby accelerating the dust cleaning process. After the dust cleaning operation is completed, it can be regularly discharged from the ash hopper.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. By setting the cloth bag as an inner and outer double layer, the present invention solves the problem of poor filtration effect caused by the original single layer. At the same time, by combining different surface filter screen densities of the cloth bag, it can filter different dusts specifically and improve the dust removal effect of the dust-containing gas.

[0029] 2. In the present invention, the two cloth bags are arranged in a staggered manner, and the connection methods are all structures that can be movably connected by hanging, such as snap rings. When the pulse nozzle blows for dust cleaning, the double-layer cloth bag shakes, and the friction between the inner and outer cloth bags is increased by the collision between them, so that the dust attached to the surface of the cloth bag falls off. At the same time, the pulse nozzle 1 blows from above the cloth bag and the pulse nozzle 2 blows upward from one-third of the side of the cloth bag, and they cooperate with each other to blow the cloth bag in sequence, shake and collide the double-layer dust removal cloth bag, and increase the movement amplitude of the connection part between the double-layer cloth bags by the direction of the wind force to improve the friction and collision force between the cloth bags, and remove the dust on the surface of the cloth bag to improve the dust cleaning effect and efficiency.

[0030] 3. In the present invention, the spiral rod arranged in the inner bag can generate high-frequency vibration under the disturbance of the air flow, so as to form a composite collision effect with the swing between the inner bag and the outer bag. The spiral rod beats the inside of the cloth bag to generate a certain vibration frequency, so that the dust or particles attached to the surface can be shaken off, and the surface dust stripping rate is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the cloth bag dust removal equipment of the present invention;

[0032] Figure 2 is a schematic diagram of the internal structure of the dust removal box body of the present invention;

[0033] Figure 3 is a schematic diagram of the arrangement rack structure of the present invention;

[0034] Figure 4 is a schematic diagram of the relationship structure between the pulse rod group and the cloth bag of the present invention;

[0035] Figure 5 is a schematic diagram of the inner bag structure of the present invention;

[0036] Figure 6 is a schematic diagram of the outer bag structure of the present invention;

[0037] Figure 7 is a schematic diagram of the spiral bar structure of the present invention;

[0038] Figure 8 is a schematic cross-sectional structure diagram of the relationship between the cross bar and the U-shaped fastener of the present invention;

[0039] Figure 9 is a schematic cross-sectional structure diagram of the knob of the present invention.

[0040] In the figure: 1. Box body; 2. Cross bar; 3. Ventilation rod; 31. Pulse nozzle 1; 4. Outer bag; 41. Fixed sleeve; 42. Knob; 5. Inner bag; 6. Hanging seat 1; 61. Bow-shaped hanging rod; 62. Hanging seat 2; 63. Spiral rod; 7. U-shaped fastener; 71. Plug-in component; 8. Pressing block; 81. Linking rod; 82. Inserting block; 83. Reset spring; 9. Pulse nozzle 2. Specific implementation mode

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. 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.

[0042] To solve the technical problem of poor dust cleaning efficiency of existing cloth bags, please refer to Figures 1-9 , and the following specific embodiments are provided according to the content of the present invention patent:

[0043] Embodiment 1: Basic multi-stage filtration dust removal system

[0044] Structural composition: The cross bar 2 is arranged longitudinally in 3 columns, and 12 double-layer dust removal cloth bag ventilation rods 3 are arranged in front of the cross bar 2 in each column

[0045] Double-layer dust removal cloth bag: The outer bag 4 is made of PTEE-coated needle felt, with a pore diameter of 50-100 μm

[0046] The inner bag 5 is made of ultra-fine fiber material, and its surface is coated with a nano-catalytic layer, with a pore diameter of ≤10 μm

[0047] Offset degree: The inner bag 5 is offset 30 mm towards the center of the diameter of the outer bag 4

[0048] Pulse rod group 1: The length is 3000 mm, the pulse nozzle 1 31 is inclined downward, and the spraying distance is 800 mm

[0049] Pulse rod group 2: The distance between the collar rings is 800 mm from the bag mouth. 8 pulse nozzles 9 are arranged in a ring on the collar ring inclined upward at an angle of 30°. The intermittent period is set to blow once every 30 s, and each time lasts for 0.2 s

[0050] Intelligent control module: PLC controller: Siemens S7-1200 series

[0051] Online monitoring: Differential pressure sensor, range 0-3000 Pa, temperature sensor, range -20°C to 200°C. Differential pressure feedback adjustment: Automatically adjust the intensity of the pulse according to the real-time monitored differential pressure

[0052] Frequency adaptability: Dust concentration > 50 mg / m3 Switch to high-frequency mode when needed

[0053] Workflow: The dusty gas enters the box after pretreatment and undergoes two-stage filtration through a double-layer dust removal cloth bag. The outer bag conducts rough filtration, and the inner bag conducts fine filtration. When pulse cleaning is required, first, the pulse nozzle 31 impacts the double-layer dust removal cloth bag, and then friction and swaying occur between the outer bag 4 and the inner bag 5, generating impacts. In combination with the spiral rod 63 arranged inside for patting from the inside, the pulse nozzle 9 is used to strengthen the impact frequency and intensity. The dust patted and removed can be regularly discharged from the ash hopper, and the cleaning cycle can be automatically started when the internal pressure difference reaches 1500 Pa.

[0054] Typical application scenarios: Suitable for secondary dust removal in converters of steel smelters, dust removal at the head and tail of cement kilns and other heavy industrial fields. The test shows as follows:

[0055] parameter traditional equipment this embodiment inlet concentration <![CDATA[200mg / m 3 > <![CDATA[≤20mg / m 3 > <![CDATA[≤10mg / m 3 <!-- 4 -->]]> dust resistivity <![CDATA[10 4 -10 6 Ω·cm]]> ≥95.5％ ≥99.5％

[0056] Example 2: High-temperature industrial dust removal system, suitable for high-temperature dusty

[0057] environments

[0058] Structural improvement:

[0059] Upgrade of double-layer cloth bag materials: The outer bag 4 is made of aluminosilicate fiber film, and the inner bag 5 is made of mullite ceramic fiber filter bag. An antioxidant coating is sprayed on the surface of the outer bag, and an explosion-proof fiber layer is added to the inner bag.

[0060] Temperature-resistant design of the pulse system:

[0061] The material of the pulse nozzle 31 is 310S stainless steel;

[0062] Pulse gas source: Supplied by a nitrogen gas storage tank

[0063] Dynamic cleaning optimization: Automatically switch to the low-frequency strong pressure mode under high-temperature operation, with a pulse pressure of 0.8 MPa and the cycle extended to 5 minutes. The spiral rod 63 is made of titanium alloy to reduce the sensitivity of the inertial moment to high-temperature vibration.

[0064] Performance indicators:

[0065] Treatment air volume: 150,000 m 3 / h

[0066] Allowable inlet temperature: ≤300 °C

[0067] Dust removal efficiency: ≥99.7%

[0068] Continuous working life: ≥6 months / time

[0069] Example 3: Chemical gas purification device, specifically used for treating SO-containing2 Chemical dust containing corrosive gases such as HCl, and the concentration is ≤500mg / m 3

[0070] Technological innovation: The inner bag has enhanced functions and the surface is coated with nano-TiO 2 Photocatalyst layer decomposes harmful gases under ultraviolet light

[0071] The filter material of inner bag 5 is PTFE / activated carbon composite fiber, with a porosity of 80% and a filtration accuracy of 1μm

[0072] Pulse system anti-corrosion design: Pulse dry group adopts PPS engineering plastic

[0073] Pulse nozzle 29: 316L stainless steel

[0074] Intelligent control module:

[0075] Gas composition sensor: Online monitoring of SO 2 , HCl concentration

[0076] Automatic regulation logic: triggers "pre-flush" procedure when acid gas is detected

[0077] Operating parameters: The cleaning cycle is automatically adjusted according to the gas composition

[0078] Impact pressure: 0.5-0.7Mpa

[0079] Outlet emission: ≤5mg / m 3

[0080] Example 4: Mobile modular dust removal equipment, suitable for temporary dust control scenarios such as construction sites and ports

[0081] Structural features: quick disassembly and assembly system, lightweight design and energy adaptability. The box adopts container design, the connection interface adopts quick-insert flange, and the main frame of the ash hopper is made of aluminum alloy when folded.

[0082] Double-layer dust bag adopts memory alloy sling, anti-fatigue life ≥ 100,000 vibrations Dual power supply system: AC power / diesel generator dual mode power supply

[0083] Solar auxiliary module: Photovoltaic panels are integrated on the top of the box, with an average daily power generation of 1.5kWh

[0084] Technical advantage: moving speed ≥ 30km / h

[0085] Environmental adaptability: IP65 protection level, can work in -20℃~50℃ environment

[0086] Instant start, less than 15 minutes Example 5: Ultra-low energy consumption intelligent dust removal system, efficient capture of PM2.5 particles Composite cleaning mechanism: main pulse cleaning is 0.3MPa low-pressure pulse

[0087] Vibration assistance: micro vibration motor and spiral rod resonance pulse nozzle 29: The nozzle is arranged at a 30° angle to form a spiral airflow trajectory

[0088] Intelligent control system:

[0089] Differential pressure sensor: 0-5000Pa high-precision measurement

[0090] AI algorithm: Predictive cleaning energy consumption optimization based on historical data: When the dust concentration is detected to be less than 10mg / m 3 Automatically switch to "Energy Saving Mode"

[0091] Performance comparison

[0092] parameter traditional equipment this embodiment unit energy consumption <![CDATA[0.8kwh / m 3 > <![CDATA[0.35kwh / m 3 > dust cleaning cycle 15 min 45 min minimum emission concentration <![CDATA[20mg / m 3 > <![CDATA[≤5mg / m 3 >

[0093] Common technical features of the embodiments

[0094] Double-layer dust removal bags and dynamic collision cleaning mechanism: natural swing is achieved through the staggered bag design, and two layers of inner and outer layers are set up, combining pulse impact to form a composite cleaning force, thereby improving cleaning efficiency and effect.

[0095] Multi-frequency pulse synergy: The multi-level energy superposition of pulse nozzle 1 31 (0.6-0.8MPa) + pulse nozzle 2 9 (0.3-0.6MPa) + vibration of the spiral rod 63 of the inner bag 5 (0-50Hz) increases the amplitude and strength of the bag swing, which can improve the dust removal effect.

[0096] Modular connection system: U-shaped fastener 7 + snap-on assembly enables quick installation and maintenance, facilitating later maintenance and replacement of bag fasteners.

[0097] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0098] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A bag-based multi-stage filtration dust removal structure and automatic dust cleaning equipment, comprising a box (1), an air inlet is provided on one side of the box (1), an air outlet is provided on the other side of the box (1), an ash hopper is provided at the lower end of the box (1), a pulse valve is provided on one side of the box (1), and the pulse valve is connected to an external pulse controller, characterized in that: A plurality of cross bars (2) are installed near the top of the box body (1), each of the cross bars (2) is provided with a buckle assembly and a push block (8), a detachable U-shaped fastener (7) is connected below the cross bar (2) through the buckle assembly, and two buckles are provided in the U-shaped fastener (7); The U-shaped fastener (7) is provided with a double-layer dust removal bag suspended by a buckle, the double-layer dust removal bag comprising an outer bag (4) and an inner bag (5) which are arranged in a staggered manner, the filter density of the outer bag (4) is lower than that of the inner bag (5), and a dust cleaning component is suspended in the inner bag (5); A pulse assembly 1 and a pulse rod assembly 2 are arranged in the box body (1). The pulse assembly 1 includes ventilation rods (3) fixed to both sides of the inner wall of the box body (1) and a plurality of pulse nozzles 1 (31) connected to the lower part of the ventilation rods (3). The nozzle of the pulse nozzle 1 (31) faces downward and is close to the upper bag opening of the double-layer dust bag. The pulse rod assembly 2 includes a sleeve ring installed on the inner wall of the box body (1) and a plurality of pulse nozzles 2 (9). The nozzle of the pulse nozzle 2 (9) faces upward and is close to the upper third of the double-layer dust bag.

2. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 1 is characterized by: The buckle assembly comprises a linkage rod (81), two insert blocks (82) and a return spring (83); one side of the plurality of cross bars (2) is connected to a micro vibration motor through a box body (1); the two insert blocks (82) are symmetrically arranged and the rear ends are both movably connected to the linkage rod (81); a push rod is provided at the upper end of the push rod (8) and is movably connected to the two linkage rods (81) in the cross bar (2) through the push rod; and the return spring (83) is fixed to the upper surface of the push rod.

3. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 2 is characterized by: The upper end of the U-shaped fastener (7) is provided with a plug-in unit (71) for connecting with the push-button block (8), and the inner side of the plug-in unit (71) is provided with a groove for interlocking with the plug-in unit (82), and the push-button block (8) is located between the two plug-ins (71) of the U-shaped fastener (7).

4. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 1 is characterized in that: The pulse assembly 1 is connected to the pulse valve through the box (1), the pulse rod assembly 2 is connected to the intermittent pulse air valve through the box (1), the pulse nozzle 2 (9) is spaced 50-100 mm from the double-layer dust removal bag, and is aligned with the upper middle part of the bag at an angle of 30°.

5. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 1 is characterized in that: Two notches are arranged in the U-shaped fastener (7), and two buckles are respectively located at the two notches. A fixing sleeve (41) is arranged at the bag opening of the outer bag (4) and the inner bag (5). The fixing sleeve (41) is movably connected to a horizontally rotatable knob (42) via a traction rope, and one of the buckles is movably connected to the knob (42). The outer bag (4) is made of a polyester film, and the inner bag (5) is made of an ultrafine fiber material, and a nano-catalytic layer is coated on the surface.

6. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 7 is characterized in that: The knob (42) is divided into two parts, an upper part and an lower part, and a connecting rod is arranged between the two parts.

7. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 5 is characterized in that: The fixing sleeve (41) of the inner bag (5) is connected to a hanging seat (6) via a traction rope, the upper end of the hanging seat (6) is connected to a bow-shaped hanging rod (61), another buckle is movably connected to the bow-shaped hanging rod (61), and the dust cleaning component is movably connected to the bottom of the hanging seat (6).

8. The multi-stage filtering dust removal structure and automatic dust cleaning equipment based on bags according to claim 7 is characterized by: The dust cleaning component comprises a second hanging seat (62) and a screw rod (63). The second hanging seat (62) and the connecting screw rod (63) are movably connected via a hanging ring. The second hanging seat (62) and the first hanging seat (6) are torsionally connected. The screw rod (63) is made of a low-density metal material.

9. A method for using a bag-based multi-stage filtration dust removal structure and an automatic dust cleaning device, characterized in that: The method includes the following steps: S1. The control system of the bag dust removal equipment is set in advance to clear the dust from the bag according to the dust concentration in the field of use. When the dust removal operation reaches 30 minutes, the cleaning operation is started once, and then the dust-containing air is sent to the air inlet through the exhaust fan at the outer end and enters the box (1). The dust-containing air is first filtered by multiple groups of double-layer dust removal bags. The outer bag (4) of the double-layer dust removal bag is made of PTFE-coated needle-punched felt with a pore size of 50-100 μm, which can filter large particles of dust. The inner bag (5) is made of ultra-fine fiber material and is coated with a nano-catalytic layer on the surface, so it can filter relatively small particles and polluting chemical components in the air; S2. When the set cleaning time is reached, the pulse valve provides a pulse to the pulse assembly 1, and the pulse nozzle 1 (31) sprays the double-layer dust removal bag downward at an angle. The change in air pressure caused by the wind during the spraying causes the inner bag (5) and the outer bag (4) to shake under the action of the hanging parts formed between the buckle and the knob (42), the hanger 1 (6) and the bow-shaped hanger (61). During the shaking, friction and collision occur between the inner bag (5) and the outer bag (4), and the spraying accelerates the dust removal; S3. When the pulse assembly 1 is pulse-spraying, the pulse assembly 2 is controlled by the intermittent pulse control unit to spray alternately with the pulse assembly 1. The pulse nozzle 2 (9) arranged on the collar is tilted upward by 30° and sprays from one side of the double-layer dust bag at a certain frequency. The frequency is 10 to 30 seconds per time, and each time is maintained for 0.2 to 1 second. The frequency variation range can automatically adjust the pulse intensity according to the real-time monitoring of the internal pressure difference. At the same time, driven by the shaking of the double-layer dust bag, the spiral rod (63) located inside the inner bag (5) shakes under the impact of the airflow due to its own gravity, and forms a flapping effect from the inside of the double-layer dust bag, thereby accelerating the cleaning process. After the cleaning operation is completed, it can be discharged regularly from the ash hopper.

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