Cloth bag dust-removing, vibration-exciting and dust-cleaning device suitable for boiling dryer and dust-cleaning method thereof

Abstract

The invention discloses a cloth bag dust-removing, vibration-exciting and dust-cleaning device suitable for a boiling dryer and a dust-cleaning method thereof, the cloth bag dust-removing, vibration-exciting and dust-cleaning device comprises a fluidized bed and a cloth bag dust-removing, vibration-exciting and dust-cleaning system, and the cloth bag dust-removing, vibration-exciting and dust-cleaning system is composed of a supporting framework, a cloth bag and a vibration-exciting device. The supporting framework is of an inner-outer double-layer cage body structure, the cloth bag comprises an inner cloth bag and an outer cloth bag, double-layer filtering is formed, and the dust collecting efficiency is improved. The vibration excitation device is composed of a vibration exciter, a flexible belt and a vibration piece, and the vibration exciter is installed on the insertion rod through the flexible belt and drives the vibration piece to act on the cloth bag to remove dust in a high-frequency vibration mode. The flexible belt can relieve vibration impact on the framework and reduce noise. Starting and stopping of the vibration exciter and the exciting force are controlled according to the front and back airflow pressure difference of the cloth bag, and ash removal according to needs is achieved. Dust on the surface of the cloth bag is removed through excitation dust removal, airflow resistance is reduced, the fluidization effect is stabilized, the service life of the cloth bag is prolonged, energy consumption is reduced, and the device is suitable for drying treatment of powdery or granular materials in multiple industries.

Description

Technical Field

[0001] The present invention belongs to the technical field of bag dust cleaning and dust removal for material drying, and relates to the optimized design of a dust cleaning and dust removal system for a fluidized bed dryer. Specifically, it is a bag dust removal vibration cleaning device and its cleaning method applicable to a fluidized bed dryer, which can efficiently capture and remove fine dust generated during the fluidized bed drying process, and is applicable to the drying and dust removal of solid preparations or materials in industries such as pharmaceuticals, food, and chemicals. Background Art

[0002] As an efficient, uniform, and rapid drying method, the fluidized bed drying technology is widely used in the pharmaceutical, food, and chemical industries. Its principle is to make granular or powdery materials in a fluidized state through high-speed air flow, increase the contact area between the materials and hot air, and then improve the heat and mass transfer efficiency to achieve rapid drying. However, during the fluidized bed drying process, due to the interaction between the materials and the air flow, a large amount of fine dust will be generated. These fine powder particles are easily carried away by the air flow, not only causing material loss but also polluting the environment. Therefore, an efficient dust removal system is an essential part of the fluidized bed drying equipment.

[0003] Currently, the dust removal technologies applied to fluidized bed dryers mainly include bag dust removal, cyclone dust removal, wet dust removal, and electrostatic dust removal, etc. Among them, the bag dust removal technology has become one of the most widely used dust removal methods due to its high dust removal efficiency, simple structure, and stable operation. The bag filter uses filter bags made of fiber fabrics to capture dust particles in the air flow, allowing clean gas to pass through, thereby achieving gas-solid separation. The dust cleaning method of bag dust removal is one of the key factors affecting its performance. Existing fluidized bed dryers generally adopt mechanical vibration dust cleaning or pulse jet dust cleaning methods for bag dust removal.

[0004] The bags for the mechanical vibration dust cleaning method are arranged in the upper part of the fluidization chamber, divided into left and right chambers, and alternately and intermittently vibrate and clean the dust in a cyclic manner. When the fine powder is captured by the bags to a certain extent, the left exhaust valve is closed, and the bags in the left chamber vibrate up and down under the action of the cylinder. The powder shaken off does not fall back into the fluidized bed for re-drying. After the operation is completed, the left exhaust valve is opened, the right exhaust valve is closed, and then the bags in the right chamber are vibrated. The left and right chambers alternately vibrate in this cycle to clean the captured powder and keep the filter bags unblocked. However, the disadvantages of the vibration dust cleaning method are as follows: the dust cleaning is not thorough, the air flow resistance of the bags is unstable, causing pulsation of the air flow velocity in the fluidization chamber, affecting the fluidization effect, and the bags are easily damaged, with a short service life and high energy consumption.

[0005] The pulse jet cleaning method is to arrange a high-pressure gas nozzle above the bag. When the fine powder is captured by the bag to a certain extent, open the nozzle air valve to blow air to the bag one by one or simultaneously to clean it in the reverse direction. Compared with the shaking cleaning, the pulse jet cleaning has the advantages of relatively good cleaning effect and high degree of automation. However, the pulse jet cleaning method also has some shortcomings: the airflow resistance of the bag is unstable, and the instantaneous airflow impact generated by the spraying gas is easy to cause severe interference to the flow field inside the fluidization chamber, affecting the fluidization effect. In addition, the high-pressure gas blowing device has high energy consumption. Furthermore, the high-pressure gas directly impacts the filter bag, which is easy to cause fatigue damage to the filter bag after long-term use, reducing the service life of the filter bag.

[0006] Taking the dust removal device for a fluidized dryer with dust collection and compression function disclosed in utility model patent CN209181399U as an example, although it improves the dust collection and compression effect by rotating the inner shell body and the extrusion plate design, its dust cleaning process still relies on mechanical rotation and extrusion, and fails to effectively solve the problems of incomplete bag cleaning and airflow interference. CN208952537U discloses a dust removal device for a fluidized dryer that is easy to clean. It adopts a multi-stage filtration and back-blowing structure. Although it is easy to clean, the back-blowing airflow disturbs the fluidized bed and does not improve the bag cleaning mechanism, and still faces the defects of low cleaning efficiency and resistance fluctuation.

[0007] In summary, the existing bag dust removal technology for fluidized bed dryers still has many problems in terms of dust removal effect, airflow stability, bag life, energy consumption, etc. Therefore, how to improve dust removal efficiency, stabilize airflow, extend bag life, and reduce energy consumption are technical issues that need to be urgently solved in fluidized bed drying and related fields. Summary of the invention

[0008] 1. Purpose of the invention In view of the above defects and deficiencies of the prior art, the purpose of the present invention is to solve the problems of incomplete cleaning, unstable airflow resistance of the bag, pulsation of airflow velocity in the fluidizing chamber, poor fluidization effect, high energy consumption, easy damage and short life of the shaking cleaning bag, and to provide a bag dust removal vibration cleaning device suitable for a boiling dryer and a cleaning method thereof, which realizes the coordinated control of dust removal and fluidized bed operation by optimizing the coupling between the bag cleaning dynamics mechanism and the system structure. Specifically, the present invention generates vibration through an exciter to drive the vibrating plate to beat the surface of the bag, remove fine powder attached to the bag, reduce the dust accumulation time, reduce the airflow resistance of the bag, ensure uniform airflow velocity in the fluidizing chamber, and improve the fluidization effect. At the same time, the flexible belt design of the excitation device can reduce the vibration and noise of the skeleton, extend the service life of the bag, and reduce the energy consumption of the equipment. In addition, the excitation force of the exciter can be flexibly adjusted according to the dust situation, and automatic control can be achieved through the pressure difference before and after the bag, further optimizing the cleaning efficiency and energy consumption control.

[0009] (2) Technical Solution To achieve the invention objective and solve its technical problems, the present invention adopts the following technical solution: The first invention objective of the present invention is to provide a bag dust removal and vibration cleaning device applicable to a fluidized bed dryer, which is used for fluidized drying of solid particles or powdery materials and realizing the collection and removal of dust, and includes: A fluidized bed, which is used for carrying and agitating the material into a fluidized state under the action of air flow; A bag dust removal and vibration cleaning system, which is arranged on the top of the fluidized bed, is used for collecting dust from the air flow discharged from the fluidized bed and keeping the bag unobstructed by vibration cleaning, and at least includes a bag skeleton, a bag and a vibration device, wherein: The bag skeleton is integrally a cage-shaped structural member and is coaxially arranged in the top cylinder of the fluidized bed, and includes an annular top plate and an inner and outer double-layer cage body, wherein: the outer edge of the annular top plate is hermetically fixed on the side wall of the top cylinder of the fluidized bed; the inner and outer double-layer cage body is fixedly arranged on the bottom surface of the annular top plate, and a plurality of axially extending inserting rods are circumferentially distributed in the radial space between the inner cage body and the outer cage body; The bag includes an inner bag and an outer bag, which are used for collecting the dust carried by the air flow in the fluidized bed, wherein: the inner bag is attached and fixed to the inner side of the inner cage body, and the outer bag covers and is fixed to the outer side of the outer cage body, forming a double-layer filtering structure; A plurality of vibration devices are provided and circumferentially distributed, which are used for applying vibration to the bag to remove the dust attached to its surface. Each vibration device includes a vibrator, a flexible belt and a vibration plate, wherein: each vibrator is installed on the inserting rod between the inner and outer double-layer cage bodies through the flexible belts on its left and right sides to slow down the vibration impact on the bag skeleton and reduce the noise, and a vibration plate is respectively fixedly connected to its inner and outer sides. The inner and outer vibration plates are both orifice plate structures extending axially, which are used for maintaining the air flow passage area during dust cleaning and reducing the fluctuation of air flow resistance. The vibration force generated by the vibrator is transmitted to the surfaces of the inner and outer bags through the inner and outer vibration plates to remove the dust, and its start-stop and vibration force magnitude are adjusted according to the air flow pressure difference before and after the bag.

[0010] The second invention objective of the present invention is to provide a dust cleaning method for the above-mentioned bag dust removal and vibration cleaning device applicable to a fluidized bed dryer, which mainly includes the following steps during implementation: SS1. Start the fluidized drying process: Start the fluidized bed to make the solid particles or powdery materials agitate and boil into a fluidized state, and at the same time the air flow carries the dust into the bag dust removal and vibration cleaning system; SS2. Judge the dust cleaning start condition: Obtain the air flow pressure difference data before and after the bag, and judge whether the bag reaches the state that needs dust cleaning based on a preset pressure difference threshold. If the pressure difference value exceeds the set threshold, enter the dust cleaning operation. If the dust cleaning condition is not reached, continue to monitor the air flow pressure difference; SS3. Start the vibration device: When the pressure difference of the airflow before and after the bag reaches the set dust cleaning threshold, a start command is issued to the vibration device. The vibrators are started in sequence or simultaneously in a preset order and the vibration force and frequency parameters of the vibrators are adjusted according to the pressure difference before and after the bag. The vibration plate is driven to vibrate and impact the inner and outer bags to remove the dust attached to the surface of the bags. SS4. Determination of dust cleaning completion: Real-time monitoring of the airflow pressure difference before and after the bag. If it is detected that the pressure difference has recovered to the set normal operating range, a control command is issued to stop the vibration device and terminate the current dust cleaning operation. If the pressure difference has not recovered, the vibration cleaning will continue until the set conditions are met. SS5. Multiple cleaning cycles: If the pressure difference before and after the bag has not returned to the normal range within the set maximum cleaning time, adjust the vibration frequency and amplitude of the excitation device and perform the cleaning cycle again until the air flow of the bag returns to normal; SS6. Reset and monitor the cleaning status: After the cleaning is completed, reset the vibration device to the standby state and continue to monitor the airflow pressure difference before and after the bag. When the pressure difference exceeds the threshold again, re-execute the cleaning steps to ensure that the bag maintains a low resistance, high air permeability and effective cleaning working state for a long time.

[0011] (III) Technical Effect Compared with the prior art, the bag dust removal vibration cleaning device and cleaning method for a fluidized bed dryer of the present invention have the following beneficial and significant technical effects: (1) The present invention replaces the traditional shaking cleaning and pulse jet cleaning methods with a vibration cleaning device, which significantly improves the cleaning effect. The vibrator in the vibration device generates vibration, which beats the surface of the bag through the vibration plate, which can completely remove the dust attached to the bag, reduce the dust accumulation time on the surface of the bag, ensure the stability of the airflow resistance of the bag, avoid the fluctuation of the airflow resistance caused by incomplete cleaning, thereby improving the uniformity of the airflow velocity in the fluidized bed and optimizing the fluidization effect.

[0012] (2) The bag and frame structure of the bag-type dust removal vibration cleaning system of the present invention can increase the dust removal area, reduce the airflow resistance of the bag, and improve the dust removal efficiency; the inner bag and the outer bag are respectively attached to the inner cage and the outer cage of the bag frame to form a double-layer filtering barrier, which can more effectively capture the dust in the airflow and reduce the dust escape. At the same time, the double-layer filtering structure increases the filtering area, reduces the load of the single-layer bag, and extends the service life of the bag.

[0013] (3) The present invention adopts a vibration cleaning device, which makes the bag cleaning simple and easy to control, the cleaning more thorough, the air flow resistance of the bag smaller and more stable, the service life of the bag longer, the air flow velocity in the fluidization chamber more uniform, the fluidization effect better, and the dust removal energy consumption reduced. Moreover, the present invention monitors the air flow pressure difference before and after the bag, and adjusts the start-stop and excitation force of the vibrator according to the change of the pressure difference to ensure that the cleaning operation is timely and accurate.

[0014] (4) The vibration plate of the present invention adopts an orifice plate structure extending along the axis, which can maintain a large air flow area during the cleaning process and avoid the flow field disturbance caused by the vibration plate blocking the air flow. In addition, the present invention suspends the vibrator through a flexible belt, avoiding the problem of excessive impact force caused by direct rigid connection, and effectively reducing the structural loss of the bag and the bag skeleton during the vibration transmission process.

[0015] (5) The present invention is applicable to the drying treatment of various materials, and can be used for the drying of materials in the solid preparation pharmaceutical process (fluidized bed dryer and fluidized bed granulator), and can also be applied to the food and chemical industries. By adjusting the excitation force and vibration frequency of the vibrator, it can adapt to the dust characteristics and cleaning requirements of different materials, and ensure the efficient operation of the equipment under different working conditions. Description of the Drawings

[0016] Figure 1 is a diagram of the bag dust removal vibration cleaning device applicable to the fluidized bed dryer of the present invention; Figure 2 is a schematic diagram of the bag dust removal vibration cleaning system in the present invention; Figure 3 is Figure 2 an enlarged view of the partial area I in Figure 4 is Figure 2 the A-A sectional view of Figure 5 is a three-dimensional structure diagram of the vibration device in the present invention; Figure 6 is a three-dimensional structure diagram of the bag skeleton in the present invention; Figure 7 is the top view of the bag skeleton in the present invention; Description of the Reference Numerals: 100 - Inlet air treatment system, 200 - Fluidized bed, 210 - Lower cylinder, 220 - Gasket, 230 - Upper cylinder, 300 - Pulse - jet cleaning system for bag filter, 310 - Filter bag, 311 - Inner filter bag, 312 - Outer filter bag, 313 - Central filter bag, 320 - Vibration device, 321 - Vibration plate, 322 - Connecting plate, 323 - Vibrator, 324 - Flexible belt, 330 - Filter bag cage, 331 - Ring - shaped top plate, 332 - Inner cage body, 333 - Outer cage body, 334 - Insert rod, 335 - Central cage body, 340 - Sealing ring, 350 - Hoop, 400 - Induced - draft pipe, 500 - Induced - draft fan. Detailed implementation mode

[0017] The present invention aims to provide a pulse - jet cleaning device for bag filter applicable to a fluidized - bed dryer and its cleaning method. To make the purpose, technical solution and advantages of the implementation of the present invention clearer, the following will describe the technical solution in the embodiments of the present invention in more detail with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, not all of the embodiments, and the described embodiments are exemplary and are intended to explain the present invention and should not be construed as a limitation of the present invention.

[0018] Embodiment 1: Pulse - jet cleaning device for bag filter applicable to a fluidized - bed dryer As a specific embodiment, the pulse - jet cleaning device for bag filter applicable to a fluidized - bed dryer provided in the embodiment of the present invention, as Figure 1 shown, is used for fluidized drying of solid particles or powdery materials and realizing the capture and removal of dust. Its main components are an inlet air treatment system 100, a fluidized bed 200, a pulse - jet cleaning system for bag filter 300, an induced - draft pipe 400, an induced - draft fan 500, etc. The inlet air treatment system 100 is connected to the bottom air inlet of the fluidized bed 200 and is used to convey the treated gas to the fluidized bed 200; the pulse - jet cleaning system for bag filter 300 is arranged at the top of the fluidized bed 200 and is used for dust capture of the air flow discharged from the fluidized bed 200 and keeping the filter bags unobstructed by pulse - jet cleaning; one end of the induced - draft pipe 400 is connected to the air outlet at the top of the pulse - jet cleaning system for bag filter 300, and the other end is connected to the induced - draft fan 500; the induced - draft fan 500 is used to generate a negative - pressure suction effect. Under the negative - pressure suction of the induced - draft fan 500, the air flow passes through the inlet air treatment system 100, enters the fluidized bed 200, agitates and boils the powdery or granular medicine powder into a fluidized state. The air flow passes through the pulse - jet cleaning system for bag filter 300, and a part of the fine powder is captured by the filter bags 310. The vibrator 323 in the vibration device 320 generates vibration, drives the vibration plate 321 to vibrate to remove the fine powder on the filter bags 310, and the filtered air is drawn out by the induced - draft fan 500 through the induced - draft pipe 400.

[0019] As Figure 2 andFigure 3 As shown in the figure, the pulse-jet cleaning system 300 of the bag filter of the present invention is arranged at the top of the fluidized bed 200, and includes a bag cage 330, a filter bag 310 and a vibration device 320. The bag cage 330 is an overall cage-shaped structural member and is coaxially arranged in the top cylinder of the fluidized bed 200, and includes an annular top plate 331 and an inner and outer double-layer cage body. Among them: the outer edge of the annular top plate 331 is hermetically fixed on the side wall of the top cylinder of the fluidized bed 200; the inner and outer double-layer cage body is fixedly arranged on the bottom surface of the annular top plate 331, and a plurality of axially extending inserting rods 334 are circumferentially distributed in the radial space between the inner cage body 332 and the outer cage body 333. The filter bag 310 includes an inner filter bag 311 and an outer filter bag 312, which are used to capture the dust carried by the airflow in the fluidized bed. Among them: the inner filter bag 311 is attached and fixed to the inner side of the inner cage body 332, and the outer filter bag 312 is wrapped and fixed to the outer side of the outer cage body 333, forming a double-layer filtering structure. A plurality of vibration devices 320 are provided and circumferentially distributed, which are used to apply vibration to the filter bag 310 to remove the dust attached to its surface.

[0020] More specifically, the top cylinder of the fluidized bed 200 includes a lower cylinder 210, an upper cylinder 230 and a gasket 220 located at the connection between the two; the annular top plate 331 of the bag cage 330 is fixedly connected to the upper cylinder 230 and the lower cylinder 210 through flange bolts, and the lower surface of the annular top plate 331 is closely attached to the gasket 220 to form a sealing structure, ensuring that all the airflow can be discharged from the fluidized bed 200 only after passing through the filtration of the filter bag 310.

[0021] As Figure 6 、 7 shown in the figure, in the embodiment of the present invention, both the inner cage body 332 and the outer cage body 333 of the bag cage 330 are composed of a plurality of axially extending and circumferentially arranged support rods and a plurality of circumferentially distributed annular support rings to form a cage-shaped support structure. The distance between the support rods and the annular support rings is set according to the material and material characteristics of the filter bag 310, ensuring that the filter bag 310 will not collapse and deform under the action of the airflow negative pressure, and at the same time ensuring that the filter bag 310 has sufficient strength to withstand the vibration of the vibration device 320.

[0022] And further preferably, a central cage body 335 is also provided in the bag cage 330 at its center. The outer side of the central cage body 335 is wrapped and fixed with a central filter bag 313, and at least one vibration device 320 is provided on the central cage body 335, and its vibrating piece 321 is used to transmit the exciting force generated by the exciter 323 to the surface of the central filter bag 313 to remove dust.

[0023] ​Between the top of the inner cloth bag 311 and the inner cage body 332, and between the top of the outer cloth bag 312 and the outer cage body 333, there are sealing rings 340 and hoop fasteners 350. The hoop fasteners 350 are used to fasten the cloth bag 310 to the cloth bag skeleton 330, preventing the cloth bag 310 from falling off or shifting under the action of air flow and vibration excitation. The sealing rings 340 are used to ensure that the air flow does not leak from the connection between the cloth bag 310 and the cloth bag skeleton 330, ensuring that the cloth bag 310 maintains a stable and reliable filtering effect during long-term use, and at the same time facilitating the installation, replacement and maintenance of the cloth bag 310. And preferably, both the inner cloth bag 311 and the outer cloth bag 312 are made of filter materials with high temperature resistance, wear resistance and good air permeability. Their fiber diameter is 10-20 microns, the porosity is 70%-85%, the filtration accuracy is 1-10 microns, and the surface is treated with antistatic and anti-adhesion. The material is selected from polyester, polypropylene, polyamide, glass fiber or polytetrafluoroethylene according to the characteristics of the material to be processed to adapt to different process conditions and material characteristics. And among them, the filtration accuracy of the inner cloth bag 311 is greater than that of the outer cloth bag 312 to ensure that the inner and outer cloth bags form a gradient filtration structure, so that the outer cloth bag 312 is used to capture larger particle dust, and the inner cloth bag 311 is used to capture fine dust, thereby improving the overall dust removal efficiency and reducing the cloth bag cleaning frequency.

[0024] As Figure 4 and Figure 5 shown, in the present invention, the number of vibration excitation devices 320 is 4-12, which are evenly distributed along the circumferential direction of the cloth bag skeleton 330, and the included angle range between adjacent vibration excitation devices 320 is 30°-90°. Each vibration excitation device 320 is mainly composed of vibration plates 321, connecting plates 322, vibration exciters 323, flexible belts 324 and other components. Each vibration exciter 323 is installed and fixed on the insertion rod 334 between the inner and outer double-layer cages of the cloth bag skeleton 330 through the through holes on the sides of the flexible belts 324 on its left and right sides. The flexible belts 324 can slow down or avoid causing vibration and noise of the skeleton due to their flexibility. And on both the inner and outer sides of the vibration exciter 323, a vibration plate 321 is fixedly connected through a connecting plate 322 respectively. The vibration excitation force generated by the vibration exciter 323 is transmitted to the surfaces of the inner and outer cloth bags through the inner and outer vibration plates 321 to remove dust. In addition, the vibration phase difference of the vibration exciters 323 of adjacent vibration excitation devices 320 is 90°-180° and different axial installation heights are set to avoid resonance superposition, and each vibration exciter 323 is independently controlled for start-stop and the magnitude of the vibration excitation force to realize ash cleaning in different regions and at different times, avoiding large fluctuations in the air flow in the fluidized bed 200 caused by simultaneous ash cleaning and ensuring the stability of fluidized drying.

[0025] More specifically, the vibrator 323 can be inertial, electric, or electromagnetic. The vibrator 323 generates vibrations and transmits the vibrations through its output shaft and by the connecting plate 322 to the vibrating plate 321. The direction of the exciting force is perpendicular to the surface of the filter bag 310. By vibrating the vibrating plate 321 to beat the surface of the filter bag 310, it plays a role in removing dust on the filter bag 310. The start and stop of the vibrator 323, as well as the exciting frequency and exciting amplitude, are dynamically adjusted according to the real-time monitoring data of the material dust characteristics and the pressure difference before and after the filter bag 310. When the pressure difference reaches the preset threshold, the exciting dust cleaning is started, and the greater the pressure difference, the greater the corresponding exciting frequency and exciting amplitude. When the pressure difference drops to the normal range, the exciting is stopped to adapt to the dust cleaning requirements under different material characteristics and different dust load conditions, extend the service life of the filter bag 310, and reduce energy consumption and operating noise. The exciting force of the vibrator 323 can be adjusted according to the material dust situation to increase or decrease the vibration amplitude, and the start and stop of the vibrator 323 can issue control instructions based on the pressure difference before and after the filter bag 310.

[0026] In the embodiment of the present invention, the vibrating plate 321 is arranged on both the inner and outer sides of the vibrator 323 through the connecting plate 322, and its plate surface is designed in the form of a perforated plate. The aperture size and distribution are optimized according to the air flow velocity and dust particle size, and the porosity is not less than 50% to prevent blocking the air flow and reducing the flow area, while avoiding dust accumulation on the surface of the vibrating plate 321. The material of the vibrating plate 321 is preferably an elastic metal material, and its surface curvature and hardness are adapted to the filter bag 310 to avoid damaging the filter bag 310 during the vibration process and at the same time meet the requirements of air flow and vibration transmission; and the gap between the vibrating plate 321 and the filter bag 310 is preferably adjustable, and by adjusting the gap size between the two to adapt to the dust characteristics and dust cleaning requirements of different materials, the dust cleaning effect is ensured while avoiding damage to the filter bag 310 due to excessive friction.

[0027] Preferably, the flexible belt 324 is made of rubber or engineering plastic with good elasticity and fatigue resistance. Its elastic parameters are optimized, its thickness is 3 - 8 mm, and its width is 30 - 50 mm to ensure effective absorption of the vibration impact of the vibrator 323 during long-term use, reduce damage to the support frame 330 caused by vibration, and reduce the noise level during the operation of the equipment. The two ends of the flexible belt 324 are fixedly connected to the vibrator 323 and the plug rod 334 respectively.

[0028] Preferably, the bag dust removal vibration cleaning system 300 is further provided with a differential pressure detection device and a control system. The differential pressure detection device monitors the change of the differential pressure on both sides of the bag 310 in real time and transmits the data to the control system. The control system controls the start and stop of the vibrator 323 and the vibration parameters according to the preset differential pressure threshold. When the detected differential pressure exceeds the upper limit threshold, the vibration cleaning is started, and when the differential pressure drops to the lower limit threshold, the vibration is stopped, realizing the control of the bag cleaning process, improving the operation efficiency of the equipment and reducing the energy consumption. The control system sets the period, duration and intensity of the vibration cleaning according to the requirements of the drying process and the material characteristics, and adjusts the frequency and vibration force of the vibration cleaning according to the change trend of the differential pressure before and after the bag 310, ensuring both the cleaning effect and prolonging the service life of the bag 310. The vibration frequency of the vibrator 323 is 10 - 60 Hz, and the vibration force range is 50 - 500 N. The differential pressure monitoring threshold before and after the bag 310 is set to 200 - 1000 Pa. When the differential pressure exceeds the set threshold, the control system first starts some of the vibration devices 320 for cleaning. If the differential pressure does not drop to the normal range, the start number and vibration force of the vibration devices 320 are gradually increased until the cleaning operation of all the bags 310 is completed, realizing the adaptive hierarchical cleaning control to ensure the cleaning effect and reduce the interference to the fluidization process.

[0029] The bag dust removal vibration cleaning device applicable to the fluidized bed dryer of the present invention has the following working principle: As Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, the bag 310 captures the fine powder in the airflow of the fluidized bed 200. The vibrator 323 in the vibration device 320 generates vibration, drives the vibration plate 321 to vibrate and beat the bag 310, removing the fine powder on the bag 310, thereby reducing the residence time of the fine powder aggregation on the bag 310, reducing the airflow resistance of the bag 310, improving the dust removal efficiency and reducing the energy consumption.

[0030] Example 2: Cleaning method Based on the bag dust removal vibration cleaning device applicable to the fluidized bed dryer provided in the above Example 1, this Example 2 further elaborates in detail the cleaning method based on this device. When implemented, it mainly includes: SS1. Start the fluidized drying process: Start the fluidized bed 200 to make the solid particles or powdery materials agitate and boil into a fluidized state, and at the same time, the airflow carries the dust into the bag dust removal vibration cleaning system 300; SS2. Judge the cleaning start condition: Obtain the airflow differential pressure data before and after the bag 310, and judge whether the bag 310 reaches the state that needs to be cleaned based on the preset differential pressure threshold. If the differential pressure value exceeds the set threshold, enter the cleaning operation. If the cleaning condition is not met, continue to monitor the airflow differential pressure; SS3. Start of the vibration device: When the air pressure difference between the front and rear of the cloth bag 310 reaches the set dust cleaning threshold value, a start command is sent to the vibration excitation device 320. The vibrator 323 starts sequentially or simultaneously according to a preset order and adjusts the vibration excitation force and vibration excitation frequency parameters of the vibrator 323 according to the size of the air pressure difference between the front and rear of the cloth bag, driving the vibrating plate 321 to perform vibration impact on the inner cloth bag 311 and the outer cloth bag 312, so that the dust attached to the surface of the cloth bag falls off; SS4. Judgment of dust cleaning completion: Monitor the air pressure difference between the front and rear of the cloth bag 310 in real time. If it is detected that the pressure difference has returned to the set normal operation range, a control command is sent to stop the vibration excitation device 320 and terminate the current dust cleaning operation. If the pressure difference has not returned, continue to perform vibration excitation dust cleaning until the set conditions are met; SS5. Multiple dust cleaning cycles: If the pressure difference between the front and rear of the cloth bag 310 still has not returned to the normal range within the set maximum dust cleaning time, adjust the vibration frequency and amplitude of the vibration excitation device 320 and perform the dust cleaning cycle again until the air flow smoothness of the cloth bag 310 returns to normal; SS6. Reset and monitoring of dust cleaning status: After the dust cleaning is completed, reset the vibration excitation device 320 to the standby state and continue to monitor the air pressure difference between the front and rear of the cloth bag 310. When the pressure difference exceeds the threshold value again, re-execute the dust cleaning steps to ensure that the cloth bag 310 maintains a low resistance, high air permeability, and effective dust cleaning working state for a long time.

[0031] In summary, the cloth bag dust removal vibration excitation dust cleaning device applicable to the fluidized bed dryer of the present invention significantly improves the dust cleaning effect, reduces energy consumption, extends the service life of the equipment, and optimizes the fluidization effect through innovative dust cleaning methods, optimized structural design, and control technologies, and has important industrial application value and economic benefits.

[0032] Through the above embodiments, the purpose of the present invention is completely and effectively achieved. Those skilled in the art can understand that the present invention includes but is not limited to the content described in the drawings and the above specific embodiments. Although the present invention has been described with respect to the currently considered most practical and preferred embodiments, it should be understood that the present invention is not limited to the disclosed embodiments, and any modifications that do not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A bag dust removal and vibration cleaning device suitable for a boiling dryer, characterized in that: include: Fluidized bed; The bag dust removal vibration cleaning system at least includes a bag frame, a bag and a vibration device, wherein: The bag frame is a cage-shaped structural member as a whole and is coaxially arranged in the top cylinder of the fluidized bed, including an annular top plate and inner and outer double-layer cage bodies, wherein: the outer edge of the annular top plate is sealed and fixed on the side wall of the top cylinder of the fluidized bed; the inner and outer double-layer cage bodies are fixedly arranged on the bottom surface of the annular top plate, and a plurality of axially extending plug rods are circumferentially distributed in the radial space between the inner cage body and the outer cage body; The cloth bag comprises an inner cloth bag and an outer cloth bag, wherein: the inner cloth bag is attached to and fixed on the inner side of the inner cage body, and the outer cloth bag covers and is fixed on the outer side of the outer cage body; The excitation devices are provided in a plurality and distributed circumferentially, and each excitation device comprises an exciter, a flexible belt and a vibration plate, wherein: each exciter is installed on the inserted rod between the inner and outer double-layer cage bodies through the flexible belts on its left and right sides, and a vibration plate is fixedly connected to its inner and outer sides respectively, and the inner and outer vibration plates are both perforated plate structures extending along the axial direction, and the excitation force generated by the exciter is transmitted to the inner and outer bag surfaces through the inner and outer vibration plates to remove dust, and its start and stop and the excitation force are adjusted according to the airflow pressure difference before and after the bag.

2. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: It also includes an air intake treatment system, an induced draft duct and an induced draft fan, wherein: the air intake treatment system is connected to the bottom air inlet of the fluidized bed; one end of the induced draft duct is connected to the air outlet at the top of the bag dust removal vibration cleaning system, and the other end is connected to the induced draft fan; the induced draft fan is used to generate a negative pressure suction effect, and its exhaust volume is adjusted according to the characteristics of the material in the fluidized bed and the fluidization requirements.

3. The bag dust removal and vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The top cylinder of the fluidized bed includes a lower cylinder, an upper cylinder and a sealing gasket located at the connection between the two; the annular top plate of the bag frame is fixedly connected to the upper cylinder and the lower cylinder by flange bolts, and the lower surface of the annular top plate is tightly fitted with the sealing gasket to form a sealing structure.

4. The bag dust removal and vibration cleaning device suitable for a fluidized bed dryer according to claim 1 is characterized in that: The inner cage and the outer cage of the bag skeleton are composed of a plurality of support rods extending axially and arranged circumferentially and a plurality of annular support rings distributed circumferentially to form a cage-like support structure. The spacing between the support rods and the annular support rings is set according to the material and material properties of the bag.

5. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: A sealing ring and a clamp are provided between the inner cloth bag and the top of the inner cage body, and between the outer cloth bag and the top of the outer cage body. The clamp is used to fasten the cloth bag to the cloth bag frame, and the sealing ring is used to ensure that the airflow does not leak from the connection between the cloth bag and the cloth bag frame.

6. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The inner bag and the outer bag are both made of filter materials that are resistant to high temperature, wear and have good air permeability. The fiber diameter is 10-20 microns, the porosity is 70%-85%, the filtration accuracy is 1-10 microns, and the surface is treated with anti-static and anti-adhesion. The material is selected from polyester, polypropylene, polyamide, glass fiber or polytetrafluoroethylene according to the characteristics of the material being processed.

7. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The number of the vibration devices is 4-12, which are evenly distributed along the circumference of the bag frame, and the angle range between adjacent vibration devices is 30°-90°; the vibration phase difference of the exciters of adjacent vibration devices is 90°-180° and different axial installation heights are set to avoid resonance superposition, and each exciter independently controls the start and stop and the size of the exciting force to achieve dust cleaning in different areas and time periods.

8. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 7, characterized in that: The vibrator is selected from at least one of an inertial vibrator, an electric vibrator and an electromagnetic vibrator. The output shaft of the vibrator is rigidly connected to the vibration plate, and the direction of the excitation force is perpendicular to the surface of the bag to achieve directional vibration cleaning; and the start and stop of the vibrator as well as the excitation frequency and amplitude are dynamically adjusted according to the real-time monitoring data of the dust characteristics of the material and the pressure difference before and after the bag. When the pressure difference reaches a preset threshold, the vibration cleaning is started, and the greater the pressure difference, the greater the corresponding excitation frequency and amplitude. The vibration is stopped when the pressure difference drops to the normal range.

9. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The vibration plate is arranged on the inner and outer sides of the exciter through a connecting plate, and its plate surface is a perforated plate structure. The aperture size and distribution are optimized according to the air flow velocity and the dust particle size. The mesh rate is not less than 50%. It is made of elastic metal material, and its surface curvature and hardness are adapted to the cloth bag.

10. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The flexible belt is made of rubber or engineering plastic with good elasticity and fatigue resistance, and its elastic parameters are optimized. Its thickness is 3-8 mm and its width is 30-50 mm. Both ends of the flexible belt are fixedly connected to the exciter and the plug rod respectively.

11. The bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to claim 1, characterized in that: The bag dust removal vibration cleaning system is also equipped with a differential pressure detection device and a control system. The differential pressure detection device monitors the pressure difference changes on the front and rear sides of the bag in real time and transmits the data to the control system; the control system controls the start and stop and vibration parameters of the vibrator according to the preset pressure difference threshold. When it is detected that the pressure difference exceeds the upper limit threshold, the vibration cleaning is started, and when the pressure difference drops to the lower limit threshold, the vibration is stopped.

12. A dust cleaning method for a bag dust removal vibration cleaning device suitable for a fluidized bed dryer according to any one of claims 1 to 11, characterized in that: The steps include: SS1. Start the fluidized bed to agitate and boil the solid particles or powdered materials into a fluidized state. At the same time, the airflow carries the dust into the bag dust removal and vibration cleaning system. SS2. Obtain the airflow pressure difference data before and after the bag, and determine whether the bag has reached the state that needs to be cleaned based on the preset pressure difference threshold. If the pressure difference value exceeds the set threshold, the cleaning operation will be started. If the cleaning condition is not met, the airflow pressure difference will continue to be monitored; SS3. When the airflow pressure difference before and after the bag reaches the set cleaning threshold, a start command is sent to the vibration device. The vibrators are started in sequence or simultaneously in a preset order and the vibration force and frequency parameters of the vibrators are adjusted according to the pressure difference before and after the bag. The vibration plate is driven to vibrate and impact the inner and outer bags to remove the dust attached to the surface of the bags. SS4. Real-time monitoring of the airflow pressure difference before and after the bag filter. If the pressure difference is detected to be restored to the set normal operating range, a control command is issued to stop the vibration device and terminate the current cleaning operation. If the pressure difference is not restored, the vibration cleaning is continued until the set conditions are met. SS5. If the pressure difference before and after the bag has not returned to the normal range within the set maximum cleaning time, adjust the vibration frequency and amplitude of the excitation device and perform the cleaning cycle again until the air flow of the bag returns to normal; SS6. After the dust cleaning is completed, reset the vibration device to the standby state and continue to monitor the airflow pressure difference before and after the bag. When the pressure difference exceeds the threshold again, re-execute the dust cleaning step to ensure that the bag maintains a low resistance, high air permeability and effective dust cleaning working state for a long time.

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