An exhaust gas pollution control device for processing coating

Abstract

This invention belongs to the technical field of waste gas treatment equipment, specifically a waste gas pollutant treatment device for coating processing. It includes a housing with an air inlet and an air outlet. A filtration system is installed inside the housing, and a reverse differential cleaning mechanism is installed within the filtration system. A linked airflow distribution mechanism is located on the side of the housing near the air inlet, and a linkage control unit is located on one side of the outer wall of the housing. The filtration system includes a rotatably mounted filter element assembly, with the filter element drum driven by a drive motor. The reverse differential cleaning mechanism includes a reverse scraper assembly closely attached to the inner wall of the filter element, which rotates in the opposite direction to the filter element drum via a planetary gear differential transmission mechanism. This invention integrates filtration, cleaning, airflow distribution, and energy management into a single unit, centered on the filtration system, achieving fully automatic closed-loop adaptive operation. It solves the problem of fragmented mechanisms in traditional equipment, and has the advantages of compact structure, stable operation, and convenient maintenance.

Description

Technical Field

[0001] This invention belongs to the technical field of waste gas treatment equipment, specifically a waste gas pollutant treatment device for processing coatings. Background Technology

[0002] The production and application of paints generate a large amount of waste gas containing pollutants such as dust and paint mist. Filtration and dust removal are essential steps in the treatment of this type of waste gas. Existing filtration and dust removal equipment typically includes filter cartridges, cleaning devices, airflow regulating devices, and electrical control systems. In practical applications, these devices often adopt an independent design and separate control mode: the filter cartridges are fixedly installed inside the housing; the cleaning devices (such as backflushing systems or scraping mechanisms) start and stop independently at preset time intervals; the airflow regulating devices open and close the air ducts according to manual settings; and the electrical control system only performs open-loop control of a single parameter (such as timed or constant-pressure).

[0003] However, this design, where each component operates independently and lacks coordination, presents a significant problem: the filtration system, cleaning mechanism, airflow distribution mechanism, and control unit are isolated and cannot operate collaboratively. Specifically, when filtration resistance increases, the cleaning mechanism cannot adaptively adjust the cleaning intensity based on the actual degree of filter clogging; the opening and closing status of the airflow channels is not correlated with the real-time working position of the filter elements, leading to some filter elements being overloaded while others remain idle; and there is no feedback adjustment between the output power of the drive motor and the cleaning intensity and airflow distribution, resulting in the equipment operating under suboptimal conditions of high energy consumption and low efficiency. This fragmented design exacerbates localized filter clogging, reduces overall filtration efficiency, and results in persistently high energy consumption. Furthermore, it cannot dynamically adjust based on fluctuations in exhaust gas concentration, ultimately leading to frequent filter replacements and significantly increased operating costs. Therefore, a waste gas pollutant treatment device for coating processing is proposed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a waste gas pollutant treatment device for coating processing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste gas pollutant treatment device for coating processing, comprising: The housing is provided with an air inlet and an air outlet. The housing is equipped with a filtration system for multi-stage filtration of exhaust gas; the filtration system is equipped with a reverse differential cleaning mechanism to remove dust adhering to the inner wall of the filtration system; a linkage airflow distribution mechanism is installed on the side of the housing near the air inlet to adjust the opening and closing of each filtration channel; a linkage control unit is installed on one side of the outer wall of the housing to adaptively adjust operating parameters according to filtration resistance and rotation position. The filtration system includes at least two sets of filter element assemblies rotatably mounted inside the housing. Each set of filter element assemblies includes a filter element rotating cylinder and a plurality of filter elements arranged at intervals along the circumference of the filter element rotating cylinder. The filter element rotating cylinder is driven to rotate by a drive motor via a reduction transmission mechanism. The air inlet is located at an eccentric position in the housing, so that the exhaust gas enters tangentially and washes the outer wall surface of the filter element rotating cylinder.

[0006] Preferably, the reverse differential cleaning mechanism includes a reverse scraper assembly disposed inside the filter element rotating cylinder. The reverse scraper assembly includes a scraper mounting bracket and a plurality of scraper blades extending axially along the filter element rotating cylinder. The scraper blades are disposed close to the outer wall surface of the filter element rotating cylinder. The drive motor drives the reverse scraper assembly simultaneously via a planetary gear differential transmission mechanism, so that the rotation direction of the scraper assembly is opposite to the rotation direction of the filter element rotating cylinder.

[0007] Preferably, the planetary gear differential transmission mechanism includes a sun gear, planet gears, and a ring gear. The sun gear is connected to the output shaft of the drive motor, the ring gear is fixedly connected to the filter element rotating cylinder, and the planet gears are connected to the scraper mounting bracket of the reverse scraper assembly. When the drive motor rotates, the sun gear drives the planet gears to revolve and rotate, so that the scraper mounting bracket obtains a rotation direction opposite to that of the filter element rotating cylinder.

[0008] Preferably, the linkage airflow distribution mechanism includes several independently openable and closable filter branch channels disposed in the housing, each filter branch channel being connected to the air inlet side of a set of filter element assemblies; the filter branch channels are controlled to open and close by a linkage switching valve assembly, and the linkage switching valve assembly is mechanically associated with the rotation position of the filter element drum.

[0009] Preferably, the linkage switching valve assembly is a rotary distribution valve, whose valve core is coaxially linked with the filter element rotating cylinder. When the filter element rotating cylinder rotates to a certain filter element entering the preset non-working area, the rotary distribution valve automatically closes the corresponding filter branch channel.

[0010] Preferably, the input port of the linkage control unit is connected to a differential pressure sensor and a position sensor for detecting the rotational position of the filter element drum, and the output port of the linkage control unit is connected to the frequency converter module of the drive motor and the actuator of the linkage switching valve assembly; the linkage control unit is internally equipped with four-fold linkage logic: First stage: Control the opening and closing of the switching valve of the corresponding filter branch channel according to the rotation position signal of the filter element drum; The second step: controlling the speed range of the drive motor based on the filter resistance signal from the differential pressure sensor; The third layer: The speed change of the drive motor is synchronously changed by the planetary gear differential transmission mechanism to change the speed of the reverse scraper assembly; The fourth layer: The change in the number of open filter branch channels alters the exhaust gas distribution ratio entering each filter element, thereby affecting the clogging rate and differential pressure feedback signal of each filter element, forming a closed-loop adaptive adjustment.

[0011] Preferably, the differential pressure sensor is installed at the outlet pipe, and its detection value is set with a low threshold, a medium threshold, and an over-threshold. When the differential pressure is less than the low threshold, the drive motor runs at a low speed. When the differential pressure is between the low threshold and the medium threshold, the drive motor runs at a medium speed, and the linkage switching valve assembly opens all filter branch channels. When the differential pressure is greater than the medium threshold but less than the over-threshold, the drive motor runs at a high speed. When the differential pressure exceeds the over-threshold, the linkage control unit issues an alarm signal.

[0012] Preferably, the bottom of the housing is provided with a dust collection hopper and a dust discharge valve. The dust collection hopper is located below the filter element rotating cylinder and is used to collect the dust scraped off by the reverse scraper assembly.

[0013] Preferably, an airflow distribution plate is provided at the air inlet to evenly distribute the exhaust gas entering the housing to each filter branch channel.

[0014] Preferably, the inner wall of the housing is provided with multiple sets of sealing partitions to isolate the air inlet and outlet sides of each filter element assembly from each other.

[0015] The beneficial effects of this invention are as follows: 1. This invention features at least two sets of filter cartridge assemblies rotatably mounted within a housing. The filter cartridge drum is driven by a motor to rotate at a constant speed, causing each filter cartridge to periodically enter the filtration zone, cleaning zone, waiting zone, and maintenance zone, forming a cyclical working mode. Inside the filter cartridge drum, a reverse scraper assembly is installed. The scraper blades are in close contact with the inner wall of the filter cartridge, and a planetary gear differential transmission mechanism ensures that the rotation direction of the scraper assembly is opposite to that of the filter cartridge drum. When the filter cartridge drum rotates forward, the scraper assembly rotates in the opposite direction at a low speed, creating a continuous relative scraping motion that removes coating dust adhering to the inner wall of the filter cartridge in real time. This structure allows for online regeneration of all filter cartridges without stopping the machine, maintaining stable filtration efficiency and significantly extending the filter cartridge replacement cycle.

[0016] 2. This invention utilizes a differential pressure sensor installed at the outlet pipe to detect filtration resistance in real time. The linkage control unit automatically switches the drive motor's speed based on preset low, medium, and high thresholds. When filtration resistance is low, the motor operates in a low-speed energy-saving mode; when filtration resistance increases, the motor accelerates to a high-speed, powerful cleaning mode. Simultaneously, the linkage control unit dynamically adjusts the number of filtration branch channels involved in the operation based on the rotation position signal of the filter element drum. Under low load, some channels are closed to reduce airflow disturbance losses; under high load, all channels are opened to ensure filtration area. Through this coordinated adjustment of speed and channel number, the equipment always operates within the optimal energy consumption range, significantly reducing energy consumption per unit of waste gas treatment.

[0017] 3. This invention employs a four-stage linkage logic preset within the linkage control unit: First, a position sensor provides feedback on the rotation phase of the filter element drum, controlling the opening and closing of the corresponding filtration branch channels; second, a differential pressure sensor provides feedback on the filtration resistance, controlling the motor speed setting; third, changes in motor speed synchronously alter the scraper assembly speed via a planetary gear differential transmission mechanism, allowing the cleaning intensity to adaptively follow changes in filtration resistance; fourth, the number of open filtration branch channels changes the exhaust gas distribution ratio, affecting the clogging rate of each filter element, which in turn reacts to the differential pressure signal, forming a closed-loop feedback. Throughout the process, the four stages mutually restrain and stimulate each other, automatically adapting to various operating conditions without manual intervention, thus overcoming the technical shortcomings of traditional equipment where each mechanism operates independently and response is lagging.

[0018] 4. This invention employs a single drive motor to simultaneously output two motion paths: one path drives the filter element drum to rotate forward via a reduction transmission mechanism, while the other path drives the reverse scraper assembly to rotate in the opposite direction at a low speed via a planetary gear differential transmission mechanism. This eliminates the need for a separate cleaning drive motor and its control system. The linkage switching valve assembly uses a rotary distribution valve, with its valve core coaxially linked to the filter element drum, eliminating the need for complex position detection and independent electronic actuators. Simultaneously, the online cleaning function significantly reduces the frequency of filter element replacement, eliminating the need for frequent manual cleaning by operators. The dust collection hopper collects the scraped dust and discharges it periodically through the dust discharge valve, preventing secondary dust re-entrainment. Sealing partitions isolate each filter chamber from each other, preventing leakage of the entire machine when replacing a single filter element. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic oblique sectional view of the present invention; Figure 3 This is a schematic diagram of the oblique top cross-section of the present invention; Figure 4 This is a schematic diagram of a partial oblique structure of the present invention; Figure 5This is a partial enlarged view of the planetary gear differential transmission mechanism of the present invention; Figure 6 This is a partially enlarged structural diagram of the filter branch channel and linkage switching valve assembly of the present invention; Figure 7 This is a cross-sectional structural diagram of the filter element rotating cylinder and filter element body of the present invention.

[0020] Marked in the image: 1. Housing; 2. Air inlet; 3. Air outlet; 4. Filter element assembly; 41. Filter element drum; 42. Filter element body; 5. Drive motor; 51. Frequency converter module; 6. Reduction transmission mechanism; 7. Reverse scraper assembly; 71. Scraper mounting bracket; 72. Scraper blade; 8. Planetary gear differential transmission mechanism; 81. Sun gear; 82. Planet gears; 83. Ring gear; 9. Filter branch channel; 10. Linkage switching valve assembly; 101. Actuator; 11. Linkage control unit; 12. Differential pressure sensor; 13. Position sensor; 14. Dust collection hopper; 15. Dust discharge valve; 16. Airflow distribution plate; 17. Sealing partition. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1-7 As shown, a waste gas pollutant treatment device for processing coatings includes a housing 1; the housing 1 is provided with an air inlet 2 and an air outlet 3; a filtration system is provided inside the housing 1, and a reverse differential cleaning mechanism is provided inside the filtration system; a linkage airflow distribution mechanism is provided on the side of the housing 1 near the air inlet 2; and a linkage control unit 11 is provided on one side of the outer wall of the housing 1. The filtration system includes at least two sets of filter element assemblies 4 rotatably installed inside the housing 1. In this embodiment, two sets of filter element assemblies 4 are arranged side by side along the length of the housing 1, and can be set to three, four or more sets depending on the processing air volume. Each set of filter element assemblies 4 includes a hollow filter element cylinder 41 and a plurality of filter elements 42 arranged circumferentially along the filter element cylinder 41. The filter elements 42 can be pleated filter cartridges or filter bags, fixed to the cylinder wall of the filter element cylinder 41, and rotate together with the filter element cylinder 41. The two ends of the filter element rotating cylinder 41 are rotatably connected to the left and right side walls of the housing 1 through bearings; the right end of the filter element rotating cylinder 41 extends out of the housing 1 and is connected to the output end of the reduction transmission mechanism 6, and the input end of the reduction transmission mechanism 6 is connected to the output shaft of the drive motor 5; the drive motor 5 is fixedly installed on one side of the outer wall of the housing 1; after the drive motor 5 is started, the filter element rotating cylinder 41 is driven to rotate at a set speed through the reduction transmission mechanism 6; The air inlet 2 is located at an eccentric position in the housing 1, that is, at a non-central position in the housing 1, so that when the exhaust gas enters from the air inlet 2, it washes the outer wall surface of the filter element rotating cylinder 41 along the tangential direction. This eccentric arrangement not only helps the exhaust gas to be evenly distributed, but also generates a certain airflow auxiliary driving force to reduce the load on the drive motor 5. The reverse differential cleaning mechanism includes a reverse scraper assembly 7 disposed inside the filter element rotating cylinder 41. The reverse scraper assembly 7 includes a scraper mounting bracket 71 extending axially along the filter element rotating cylinder 41, and a plurality of scraper blades 72 fixedly connected to the scraper mounting bracket 71. The scraper blades 72 extend axially along the filter element rotating cylinder 41, and their cutting edges are in close contact with the outer wall surface of the filter element rotating cylinder 41. In this embodiment, there are three scraper blades 72, which are evenly distributed circumferentially. The drive motor 5 drives the reverse scraper assembly 7 simultaneously via the planetary gear differential transmission mechanism 8. The planetary gear differential transmission mechanism 8 includes a sun gear 81, planet gears 82, and a gear ring 83. The sun gear 81 is fixedly connected to the output shaft of the drive motor 5, and the gear ring 83 is fixedly connected to the right end of the filter element drum 41. The planet gears 82 are fixedly connected to the scraper mounting bracket 71 of the reverse scraper assembly 7, and the planet gears 82 mesh with the sun gear 81 and the gear ring 83 respectively. When the drive motor 5 rotates, the sun gear 81 drives the planetary gears 82 to revolve and rotate. Since the gear ring 83 rotates together with the filter element cylinder 41, the output speed and direction of the planetary gears 82 are combined through differential speed, so that the scraper mounting bracket 71 obtains a low-speed rotation opposite to the rotation direction of the filter element cylinder 41. The filter element cylinder 41 rotates in the forward direction, while the scraper assembly 7 rotates in the reverse direction. The mutual reverse movement of the filter element cylinder 41 and the scraper assembly 7 causes the scraper blade 72 to generate a continuous relative scraping motion between the inner wall of the filter element cylinder 41 and the scraper blade 72, thereby effectively peeling off the paint dust attached to the outer wall of the filter element body 42. The linkage airflow distribution mechanism includes several independently openable and closable filter branch channels 9 disposed in the housing 1. Each filter branch channel 9 is connected to the air inlet side of a set of filter element assemblies 4. In this embodiment, each set of filter element assemblies 4 has an independent filter branch channel 9 on the side near the air inlet 2, and the channels are isolated from each other by partitions. The filter branch channel 9 is controlled to open and close by the linkage switching valve assembly 10, which is mechanically linked to the rotation position of the filter element rotating cylinder 41. Specifically, the linkage switching valve assembly 10 is a rotary distribution valve, whose valve core is coaxially linked with the filter element rotating cylinder 41 through a connecting rod. When the filter element rotating cylinder 41 rotates to a certain filter element 42 entering the preset non-working zone, the valve core of the rotary distribution valve automatically closes the filter branch channel 9 corresponding to that filter element 42, cutting off the air intake of that channel. At the same time, other filter branch channels 9 remain open or open in sequence. Through this mechanical linkage, the synchronous switching of the filter channel and the working position of the filter element is realized, avoiding short-circuiting of exhaust gas through uncleaned filter elements. The linkage control unit 11 is fixedly installed on one side of the outer wall of the housing 1. The input port of the linkage control unit 11 is connected to the differential pressure sensor 12 and the position sensor 13 through the signal line. The differential pressure sensor 12 is set at the pipeline of the air outlet 3 and is used to detect the pressure difference before and after the filtration system in real time, i.e., the filtration resistance. The position sensor 13 is installed on the rotating shaft of the filter element rotating cylinder 41 and is used to detect the real-time rotation angle of the filter element rotating cylinder 41. The output port of the linkage control unit 11 is connected to the frequency conversion adjustment module 51 of the drive motor 5 and the actuator 101 of the linkage switching valve assembly 10 via a control line. The frequency conversion adjustment module 51 is used to adjust the power supply frequency of the drive motor 5, thereby changing the speed of the drive motor 5; the actuator 101 is used to drive the valve core in the linkage switching valve assembly 10 to move. The bottom of the housing 1 is provided with a dust collection hopper 14 and a dust discharge valve 15. The dust collection hopper 14 is located directly below the filter element rotating cylinder 41 and is funnel-shaped. It is used to collect the dust scraped off by the reverse scraper assembly 7. The dust discharge valve 15 is installed at the lower outlet of the dust collection hopper 14 and is opened periodically to discharge the accumulated dust. An airflow equalization plate 16 is provided at the air inlet 2. The airflow equalization plate 16 is a metal plate with multiple evenly distributed small holes. The exhaust gas entering the box 1 passes through the equalization plate before entering the filter branch channel 9, so as to achieve uniform airflow distribution and prevent local airflow velocity from being too high. Multiple sets of sealing baffles 17 are fixedly installed on the inner wall of the housing 1. The sealing baffles 17 are located between adjacent filter element assemblies 4 and between filter element assemblies 4 and the side wall of housing 1, which isolate the air inlet side and air outlet side of each set of filter element assemblies 4 from each other, so as to prevent unfiltered exhaust gas from short-circuiting directly into the air outlet 3 through the gap. Working principle: Before starting the equipment, close the dust discharge valve 15 at the bottom of the housing 1, check whether each sealing baffle 17 is intact, confirm that the linkage switching valve assembly 10 is in the initial state, and all filter branch channels 9 are in the open state; start the drive motor 5, and the output shaft of the drive motor 5 drives the filter element drum 41 to start rotating in the forward direction through the reduction transmission mechanism 6; the rotation speed of the filter element drum 41 is set to the low speed level by the linkage control unit 11 according to the initial pressure difference; Meanwhile, the output shaft of the drive motor 5 drives the reverse scraper assembly 7 to move through the planetary gear differential transmission mechanism 8; the sun gear 81 rotates with the output shaft of the drive motor 5, driving the planetary gears 82 to revolve and rotate on their own axis. The planetary gears 82 mesh with the gear ring 83 fixedly connected to the filter element cylinder 41 on one hand, and transmit the combined reverse low-speed rotation to the scraper mounting bracket 71 on the other hand; therefore, the scraper mounting bracket 71 obtains a low-speed rotation opposite to the rotation direction of the filter element cylinder 41, and the absolute value of the rotation speed of the scraper assembly 7 is lower than the rotation speed of the filter element cylinder 41; the cutting edge of the scraper blade 72 is always in close contact with the outer wall surface of the filter element cylinder 41; Exhaust gas containing paint dust enters the housing 1 through the air inlet 2. Since the air inlet 2 is located at an eccentric position in the housing 1, the exhaust gas rushes at high speed along the tangential direction of the filter element rotating cylinder 41 to wash the outer wall of the filter element rotating cylinder 41. This eccentric tangential entry design produces two effects: First, large dust particles in the exhaust gas are initially separated under the action of centrifugal force and fall to the bottom of the housing 1; Second, the tangential scouring force of the airflow helps to drive the filter element rotating cylinder 41 to rotate, reducing the load on the drive motor 5. After the exhaust gas is evenly dispersed by the airflow distribution plate 16, it enters each filter branch channel 9. At this time, since all filter branch channels 9 are open, the exhaust gas enters the air inlet side of each filter element assembly 4. The exhaust gas passes through the filter element body 42 from the outside of the filter element cylinder 41 and enters the inside of the filter element cylinder 41. The dust is trapped on the outer surface of the filter element body 42, and the purified gas is discharged from the inside of the filter element cylinder 41 through the air outlet 3. While filtration is in progress, the reverse scraper assembly 7 continues to work. As the filter element drum 41 rotates in the forward direction and the scraper blade 72 rotates in the reverse direction, a continuous relative motion is formed between the two. The scraper blade 72 slides across the outer wall of the filter element drum 41 at a low rotation speed, scraping off the fine dust that has penetrated the filter element body 42 and adhered to the outer wall of the filter element. The scraped-off dust falls into the dust collection hopper 14 at the bottom of the housing 1 under the action of gravity. The cleaning process does not require stopping the machine, and the filtration and cleaning are carried out simultaneously. Each filter element 42 in each filter element assembly 4 passes through the scraping area of ​​the scraper blade 72 periodically with the filter element rotating drum 41, thereby obtaining uniform online regeneration. As the filtration time increases, dust gradually accumulates on the surface of the filter element 42, and the filtration resistance, i.e. the pressure difference between the air inlet 2 and the air outlet 3 detected by the differential pressure sensor 12, gradually increases. When a filter element 42 in a certain filter element assembly 4 rotates with the filter element drum 41 to the preset "non-working area", that is, the angle area that needs to be cleaned or maintained, the position sensor 13 detects the rotation position signal and transmits it to the linkage control unit 11. According to the first linkage logic, the linkage control unit 11 sends a command to the actuator 101 of the linkage switching valve assembly 10. The linkage switching valve assembly 10 is a rotary distribution valve, whose valve core is coaxially linked with the filter element cylinder 41 or is driven independently by the actuator 101. When a closing command is received, the valve core rotates, closing the filter branch channel 9 corresponding to the filter element body 42. At this time, the filter element assembly 4 stops air intake, but its filter element cylinder 41 continues to rotate, and the internal scraper blade 72 performs enhanced cleaning of the filter element assembly. Other filter branch channels 9 remain open, and the exhaust gas is redistributed to the still working filter element assembly 4. When the closed filter element 42 rotates away from the non-working area with the filter element drum 41, the position sensor 13 sends a signal again, and the linkage control unit 11 controls the linkage switching valve assembly 10 to reopen the filter branch channel 9, restoring the normal filtration operation of the filter element group; this cycle repeats, and each filter element assembly 4 enters the offline cleaning state in sequence, realizing the automatic rotation of the filter channel. The differential pressure sensor 12 monitors the total differential pressure of the filtration system in real time and transmits the signal to the linkage control unit 11; the linkage control unit 11 has three preset pressure limits: low threshold, medium threshold and over threshold. When the pressure difference is less than the low threshold, it indicates that the filter element surface is relatively clean and the filtration resistance is low. The linkage control unit 11 executes the second linkage logic and controls the frequency conversion adjustment module 51 to keep the drive motor 5 at a low speed. At this time, the filter element drum 41 rotates at a low speed. Due to the linkage relationship of the planetary gear differential transmission mechanism 8, the rotation speed of the scraper assembly 7 is also correspondingly low. The cleaning intensity is moderate and the equipment energy consumption is the lowest. When the differential pressure is between the low threshold and the medium threshold, it indicates that the filter element has begun to become clogged to a certain extent. The linkage control unit 11 controls the drive motor 5 to switch to the medium speed gear. At the same time, in order to ensure that the filtration area does not decrease, the linkage control unit 11 instructs the linkage switching valve assembly 10 to open all filtration branch channels 9, so that all filter element assemblies 4 participate in filtration at the same time to share the load. As the speed of the drive motor 5 increases, the speed of the scraper assembly 7 increases synchronously through the planetary gear differential transmission mechanism 8, the cleaning intensity is enhanced, and it helps to suppress the further increase of the differential pressure. When the pressure difference is greater than the middle threshold but less than the over threshold, it indicates that the filter element is severely clogged and requires strong cleaning. The linkage control unit 11 controls the drive motor 5 to switch to the high speed setting. The filter element drum 41 rotates at high speed, and the speed of the scraper assembly 7 increases significantly in sync. The scraping frequency and linear speed increase significantly, and the cleaning intensity reaches the maximum. At the same time, the linkage switching valve assembly 10 continues to keep all filter branch channels 9 open, so that each filter element can quickly restore its permeability under high-intensity cleaning, and the pressure difference gradually decreases. When the differential pressure exceeds the threshold, it indicates that although the maximum intensity of online cleaning has been carried out, the filtration resistance is still too high. This may be because the filter element has reached the end of its service life or due to irreversible blockage caused by special operating conditions. At this time, the linkage control unit 11 issues an audible and visual alarm signal to prompt the operator to stop the machine to check or replace the filter element assembly 4. The actions in each of the above stages are not performed independently, but rather form a closed-loop adaptive system through a four-fold linkage logic; In the initial state, the equipment runs at a low speed, and some filter branch channels 9 are intermittently closed according to the rotation sequence, and the differential pressure is stable below the low threshold. The resistance increase is triggered because the exhaust gas concentration suddenly increases, the dust accumulation on the filter element surface accelerates, and the detection value of the differential pressure sensor 12 rises to near the medium threshold. Second linkage: The linkage control unit 11 increases the speed of the drive motor 5 from medium speed to high speed; the output power of the drive motor 5 increases, and the speed of the filter element drum 41 increases. The third linkage: the speed of the drive motor 5 increases, and the speed of the scraper assembly 7 is increased synchronously through the planetary gear differential transmission mechanism 8, which enhances the cleaning intensity and speeds up the scraping frequency; First linkage: The position sensor 13 continuously provides feedback on the rotation phase of the filter element drum 41, and the linkage switching valve assembly 10 closes a certain filter branch channel 9 according to a predetermined sequence, so that the filter element group can be cleaned more thoroughly, while other channels continue to work. Because a certain channel is temporarily closed, the exhaust gas is redistributed to other open filter branch channels 9, causing a short-term increase in the filtration load of these channels and possible brief fluctuations in differential pressure. However, the high-intensity cleaning action causes the filter elements in the closed channels to regenerate rapidly, and then the channels are reopened, restoring the original airflow distribution. At the same time, the resistance of the cleaned filter elements is significantly reduced, and the overall differential pressure gradually drops. When the differential pressure drops below the low threshold, the linkage control unit 11 automatically switches the drive motor 5 back to the low speed gear, and the scraper assembly 7 reduces its speed synchronously, and the equipment returns to the energy-saving operation state. Throughout the process, the linkage control unit 11 does not require manual intervention. It relies solely on the signals from the differential pressure sensor 12 and the position sensor 13, combined with the internally preset four-fold linkage logic, to automatically complete the coordinated optimization of filtration, cleaning, airflow distribution, and energy consumption management. When the equipment needs to be shut down for maintenance or filter replacement, first turn off the drive motor 5. After the filter drum 41 has completely stopped rotating, open the maintenance door on the side of the housing 1. The operator can take out the filter assembly 4 for replacement or cleaning. At the same time, open the dust discharge valve 15 to discharge the dust accumulated in the dust collection hopper 14. The sealing partition 17 ensures the independent sealing of each filter chamber and prevents leakage of the whole machine when replacing a single filter element. The equipment of the present invention can be adapted to different coating processing conditions. For situations with low dust concentration, the number of filter element components 4 can be appropriately reduced and the reference speed of the drive motor 5 can be reduced to further save energy. For high-concentration, high-viscosity coating exhaust gas, a wear-resistant coating or heating device can be added to the scraper blade 72 to prevent dust adhesion. For situations with high explosion-proof requirements, all electrical components are explosion-proof, and the scraper blade 72 is made of copper-based or polytetrafluoroethylene material to avoid spark generation.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste gas pollutant treatment device for coating processing, characterized in that: include: The box (1) is provided with an air inlet (2) and an air outlet (3). The housing (1) is equipped with a filtration system for multi-stage filtration of exhaust gas; the filtration system is equipped with a reverse differential cleaning mechanism for removing dust adhering to the inner wall of the filtration system; a linkage airflow distribution mechanism is provided on the side of the housing (1) near the air inlet (2) for adjusting the opening and closing of each filtration channel; a linkage control unit (11) is provided on one side of the outer wall of the housing (1) for adaptively adjusting operating parameters according to filtration resistance and rotation position. The filtration system includes at least two sets of filter element assemblies (4) rotatably installed in the housing (1). Each set of filter element assemblies (4) includes a filter element cylinder (41) and a plurality of filter elements (42) arranged circumferentially along the filter element cylinder (41). The filter element cylinder (41) is driven to rotate by a drive motor (5) via a reduction transmission mechanism (6). The air inlet (2) is located at an eccentric position in the housing (1) so that the exhaust gas enters tangentially and washes the outer wall surface of the filter element cylinder (41).

2. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: The reverse differential cleaning mechanism includes a reverse scraper assembly (7) disposed inside the filter element drum (41). The reverse scraper assembly (7) includes a scraper mounting bracket (71) and a plurality of scraper blades (72) extending axially along the filter element drum (41). The scraper blades (72) are disposed close to the outer wall surface of the filter element drum (41). The drive motor (5) drives the reverse scraper assembly (7) simultaneously via a planetary gear differential transmission mechanism (8), so that the rotation direction of the scraper assembly (7) is opposite to the rotation direction of the filter element drum (41).

3. The waste gas pollutant treatment equipment for coating processing according to claim 2, characterized in that: The planetary gear differential transmission mechanism (8) includes a sun gear (81), planet gears (82) and a gear ring (83). The sun gear (81) is connected to the output shaft of the drive motor (5). The gear ring (83) is fixedly connected to the filter element drum (41). The planet gears (82) are connected to the scraper mounting bracket (71) of the reverse scraper assembly (7). When the drive motor (5) rotates, the sun gear (81) drives the planet gears (82) to revolve and rotate, so that the scraper mounting bracket (71) obtains a rotation direction opposite to that of the filter element drum (41).

4. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: The linkage airflow distribution mechanism includes several independently openable and closable filter branch channels (9) set in the housing (1). Each filter branch channel (9) is connected to the air inlet side of a set of filter element assemblies (4). The filter branch channels (9) are controlled to open and close by the linkage switching valve assembly (10). The linkage switching valve assembly (10) is mechanically associated with the rotation position of the filter element rotating cylinder (41).

5. The waste gas pollutant treatment equipment for coating processing according to claim 4, characterized in that: The linkage switching valve assembly (10) is a rotary distribution valve, whose valve core is coaxially linked with the filter element rotating cylinder (41). When the filter element rotating cylinder (41) rotates to a certain filter element (42) and enters the preset non-working area, the rotary distribution valve automatically closes the corresponding filter branch channel (9).

6. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: The input port of the linkage control unit (11) is connected to a differential pressure sensor (12) and a position sensor (13) for detecting the rotation position of the filter element drum (41). The output port of the linkage control unit (11) is connected to the frequency conversion adjustment module (51) of the drive motor (5) and the actuator (101) of the linkage switching valve assembly (10). The linkage control unit (11) is equipped with four-fold linkage logic: First step: Control the opening and closing of the switching valve (10) of the corresponding filter branch channel (9) according to the rotation position signal of the filter element drum (41); Second step: Control the speed range of the drive motor (5) based on the filter resistance signal of the differential pressure sensor (12); Third: The speed change of the drive motor (5) is synchronously changed by the planetary gear differential transmission mechanism (8) to change the speed of the reverse scraper assembly (7); Fourthly, the change in the number of open filter branch channels (9) alters the exhaust gas distribution ratio entering each filter element assembly (4), thereby affecting the clogging rate and differential pressure feedback signal of each filter element, forming a closed-loop adaptive adjustment.

7. The waste gas pollutant treatment equipment for coating processing according to claim 6, characterized in that: The differential pressure sensor (12) is installed at the outlet (3) pipeline, and its detection value is set with a low threshold, a medium threshold and an over threshold. When the differential pressure is less than the low threshold, the drive motor (5) runs at a low speed. When the differential pressure is between the low threshold and the medium threshold, the drive motor (5) runs at a medium speed, and the linkage switching valve assembly (10) opens all filter branch channels (9). When the differential pressure is greater than the medium threshold and less than the over threshold, the drive motor (5) runs at a high speed. When the differential pressure exceeds the over threshold, the linkage control unit (11) issues an alarm signal.

8. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: The bottom of the housing (1) is provided with a dust collection hopper (14) and a dust discharge valve (15). The dust collection hopper (14) is located below the filter element rotating cylinder (41) and is used to collect the dust scraped off by the reverse scraper assembly (7).

9. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: An airflow distribution plate (16) is provided at the air inlet (2) so that the exhaust gas entering the box (1) is evenly distributed to each filter branch channel (9).

10. The waste gas pollutant treatment equipment for coating processing according to claim 1, characterized in that: The inner wall of the housing (1) is provided with multiple sets of sealing partitions (17) to isolate the air inlet and outlet sides of each filter element assembly (4) from each other.

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