Dust treatment device and process based on powder coating production

Abstract

The invention relates to the technical field of dust treatment, and discloses a dust treatment device and process based on powder coating production, and the dust treatment device based on powder coating production comprises a machine shell, an air inlet, an air outlet, a dust outlet and a pulse injection device arranged on the machine shell, and the air inlet, the air outlet and the dust outlet are formed in the machine shell. A filtering assembly is further arranged in the machine shell and comprises an upper sealing plate and a lower sealing plate which are fixed to the upper position and the lower position in the machine shell, four sets of filtering cylinders are symmetrically arranged between the upper sealing plate and the lower sealing plate, and upper vent holes and lower vent holes are formed in the positions, corresponding to the upper ends and the lower ends of all the sets of filtering cylinders, of the upper sealing plate and the lower sealing plate correspondingly. Arc-shaped channels are correspondingly formed in the upper sealing plate and the lower sealing plate around the upper vent hole and the lower vent hole, and a baffle is movably arranged on the outer side of each group of arc-shaped channels. Through bidirectional airflow impact, the filter cartridge can be subjected to more comprehensive reverse airflow disturbance, so that viscous dust attached to the inner surface and the outer surface of the filter cartridge and deeply embedded in pores of the filter cartridge is effectively stripped.

Description

Technical Field

[0001] This invention relates to the field of dust treatment technology, and in particular to a dust treatment device and process based on powder coating production. Background Technology

[0002] In the production process of powder coatings, since the main components of powder coatings (resin, pigment, filler, and additives) are all fine powders, they are very easy to diffuse in the air. Therefore, dust control is the key to production safety, environmental compliance, and product quality. At present, the commonly used dust treatment device is the cartridge dust collector. Its working process is to introduce the dust-laden airflow into the dust collector hopper, and intercept the dust particles through the vertically arranged filter cartridges. The purified air then penetrates the filter material, is collected in the clean air chamber, and is discharged in compliance with standards.

[0003] Although cartridge dust collectors are widely used, when dealing with specific dusts such as powder coatings, the powder coating formulation generates a large number of submicron-sized ultrafine particles during the grinding process. These particles are not only small in size, but also have a certain degree of viscoelasticity due to the properties of their polymer materials. During filtration, they can easily penetrate the initial layer of the filter material surface and penetrate deep into the fiber network, even physically adsorbing onto the fibers. The airflow impact force generated by conventional pulse jet cleaning is difficult to effectively remove these deeply embedded particles. Over time, the pores of the filter material are gradually blocked, the airflow channels are narrowed, and a "clogging" effect is formed. Secondly, when the humidity control of the production environment is poor, or when humid external air flows back into the low-temperature area of ​​the dust collector during shutdown, the powder remaining on the cartridge will absorb moisture. The adhesion between the moisture-absorbing powder particles is enhanced, and it is easy to form wet mud-like agglomerates in the dead corners of the airflow in the cartridge. Over time, this will form a hard crust that adheres to the surface of the cartridge. As the crusted area expands, the effective ventilation area of ​​the cartridge will continuously decrease, thus seriously affecting the effectiveness and continuity of dust treatment operations. Summary of the Invention

[0004] The purpose of this invention is to provide a dust treatment device and process based on powder coating production, so as to solve the problems mentioned in the background art, such as the difficulty in cleaning and filter cartridge clogging caused by deep embedding and moisture absorption caking when the existing cartridge dust collectors are used to treat specific dusts such as powder coatings.

[0005] The present invention provides a dust treatment device and process based on powder coating production, which adopts the following technical solution: A dust treatment device based on powder coating production includes a housing, an air inlet, an exhaust outlet, a dust outlet, and a pulse jet cleaning device mounted on the housing. The housing also contains a filter assembly, which includes an upper sealing plate and a lower sealing plate fixed vertically within the housing. Four sets of filter cartridges are symmetrically arranged between the upper and lower sealing plates. Upper and lower vent holes are respectively provided on the upper and lower sealing plates corresponding to the upper and lower ends of each set of filter cartridges. Arc-shaped channels are also provided around the upper and lower sealing plates corresponding to the upper and lower vent holes. A baffle is movably mounted on the outer side of each arc-shaped channel. Each filter cartridge is equipped with a switching unit. The switching unit includes an annular sliding plate that is slidably disposed inside the filter cartridge. The upper and lower sides of the annular sliding plate are symmetrically fixed with linkage rods. When the annular sliding plate moves to the top of the filter cartridge, the linkage rod on its upper side pushes open the baffle at the upper sealing plate, opening the upper arc-shaped channel. At the same time, the annular sliding plate blocks the upper vent, forcing the dust-laden airflow to enter from the lower vent. When the annular sliding plate moves to the bottom of the filter cartridge, the linkage rod on its lower side pushes open the baffle at the lower sealing plate, and at the same time, the annular sliding plate blocks the lower vent, forcing the dust-laden airflow to enter from the lower arc-shaped channel.

[0006] Furthermore, each set of baffles has an annular limiting plate fixed on its inner side. The upper and lower sealing plates are provided with annular slots corresponding to the annular limiting plates. The annular limiting plates are movably inserted into the corresponding annular slots, and a first spring is provided between the annular limiting plates and the annular slots.

[0007] Furthermore, the switching unit also includes a bracket fixed inside the upper and lower vent holes, a guide rod fixed on the upper bracket, and a second spring disposed between the annular slide plate and the bracket. The second spring is sleeved outside the guide rod. A traction cable is fixed to the bottom of the annular slide plate. Two sets of winding shafts are rotatably disposed inside the housing, wherein the free end of the traction cable is wound around the corresponding winding shaft. A transmission component is disposed between the two sets of winding shafts. A motor is installed on the housing, and the motor drives the winding shafts to rotate forward and backward, thereby controlling the annular slide plate to rise and fall inside the filter cartridge by winding and releasing the traction cable.

[0008] Furthermore, the annular slide plate is provided with a vibration mechanism, which includes a plurality of radial grooves evenly distributed along the circumference of the annular slide plate, a rod slidably disposed in each radial groove, and a vibration head fixed to the outer end of the rod. A cam is fixedly connected to the rod, and a third spring acting on the cam is provided in the radial groove, with the third spring sleeved on the outside of the rod.

[0009] Furthermore, the annular slide plate has a mounting cavity at its center, and an end face cam is rotatably connected to the mounting cavity via a bearing. A screw is fixedly connected to the bottom end of the guide rod, and the screw extends downward and is fixed to the lower bracket. The center of the end face cam has a threaded hole that mates with the screw. The inner end of the insertion rod extends into the mounting cavity and contacts the working surface of the end face cam. When the annular slide moves up and down, the end face cam rotates due to the thread action of the screw, and its working surface periodically pushes the insert rod outward, causing the vibrating head to hammer the inner wall of the filter cylinder.

[0010] Furthermore, a roller is mounted on the inner end of the insertion rod via a rotating shaft, and the roller slides in contact with the working surface of the end face cam.

[0011] Furthermore, the working surface of the end face cam is a closed-loop curved surface composed of alternating protrusions and flat parts distributed along the circumference.

[0012] Furthermore, the upper and lower end faces of the annular slide plate are provided with sealing gaskets, which are used to achieve a seal when blocking the upper or lower vent hole.

[0013] Furthermore, a sealing strip is provided on the inner side of the baffle, which is used to form a seal with the periphery of the corresponding arc-shaped channel when the baffle is closed.

[0014] A dust treatment process based on powder coating production, according to the dust treatment device based on powder coating production, includes the following steps: Step 1: Normal filtration stage. Dust-laden airflow enters the housing through the air inlet, is filtered by the filter cartridge, the dust is trapped, and the clean air is discharged from the exhaust port. Step 2: Dust removal triggering stage. When the system pressure difference reaches the set value or the predetermined time is reached, the dust removal program is triggered. The pulse jet cleaning equipment is started to spray high-pressure gas into the filter cartridge for preliminary dust removal. Step 3: Deep cleaning stage. The drive motor starts and the traction cable pulls the annular slide plate to move once inside the filter cartridge. During this process, the movement of the annular slide plate changes the air intake direction of the filter cartridge. At the same time, the rotation of the end face cam drives the vibrating head to perform multi-point and periodic hammering on the inner wall of the filter cartridge, shaking off the condensed dust. Step 4: Filtration recovery stage. After dust removal is completed, the annular slide plate returns to its initial position, and the baffle returns to its original position under the action of the spring, closing the arc-shaped channel and restoring the normal filtration stage. The removed dust is discharged from the dust outlet.

[0015] The beneficial effects of this invention are: By setting up a filtration assembly in conjunction with a switching unit, the periodic switching of the direction of the dust-laden airflow into the filter cartridge is achieved. This allows the dust-laden airflow to alternately enter from the bottom of the filter cartridge through the lower vent and exit through the upper arc-shaped channel, or enter from the lower arc-shaped channel and exit through the upper vent. The bidirectional airflow impact ensures that the filter cartridge is subjected to more comprehensive airflow disturbance, thereby effectively stripping away sticky dust adhering to the inner and outer surfaces of the filter cartridge and deeply embedded in the filter cartridge pores. The periodic switching of airflow direction, combined with the reverse airflow impact, effectively prevents dust from accumulating in specific areas of the filter cartridge for a long time and forming a "clogged screen." This effectively solves the problem of incomplete dust removal caused by the single airflow when traditional cartridge dust collectors handle powder coating dust, thus significantly improving dust removal efficiency. This ensures the long-term stable operation and low resistance of the dust treatment device, thereby reducing system energy consumption and ensuring continuous and efficient dust collection and compliant airflow emissions. At the same time, it reduces the waste filter material generated due to filter cartridge clogging and failure, demonstrating good environmental benefits.

[0016] By setting up a vibration mechanism, the lifting motion of the annular slide plate drives the end face cam to rotate, thereby causing multiple vibration heads to periodically hammer the inner wall of the filter cartridge. The powerful vibration and impact generated by the vibration can effectively loosen and peel off hard crusts and caking dust formed by moisture, long-term compaction or other factors. Through the combined action of the vibration mechanism and bidirectional backwashing by airflow, it can effectively remove powder coating dust with strong adhesion and easy caking, greatly reducing equipment downtime caused by incomplete dust removal and ensuring the continuity of powder coating production. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the housing of the present invention; Figure 3 This is a three-dimensional structural diagram of the upper sealing plate, lower sealing plate, and filter cartridge of the present invention; Figure 4 This is a front view cross-sectional diagram of the upper sealing plate, lower sealing plate, and filter cylinder of the present invention. Figure 5 This is a three-dimensional cross-sectional view of the upper sealing plate, lower sealing plate, filter cylinder, upper vent, lower vent, arc-shaped channel, and baffle of the present invention. Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 7 This is a three-dimensional structural diagram of the baffle of the present invention; Figure 8 This is a three-dimensional structural diagram of the upper sealing plate, lower sealing plate, filter cylinder, upper vent hole, and lower vent hole of the present invention. Figure 9This is a three-dimensional structural diagram of the housing, upper sealing plate, lower sealing plate, bracket, and switching unit of the present invention; Figure 10 This is a three-dimensional structural diagram of the annular sliding plate, linkage rod, guide rod, second spring, and traction cable of the present invention; Figure 11 This is a side cross-sectional view of the three-dimensional structure of the annular sliding plate of the present invention; Figure 12 This is a top cross-sectional view of the three-dimensional structure of the annular sliding plate of the present invention; Figure 13 This is a three-dimensional structural diagram of the guide rod, end face cam, and screw of the present invention.

[0018] In the picture: 1. Housing; 2. Air inlet; 3. Exhaust outlet; 4. Dust outlet; 5. Filter assembly; 51. Upper sealing plate; 52. Lower sealing plate; 53. Filter cartridge; 541. Upper vent; 542. Lower vent; 55. Arc-shaped channel; 56. Baffle; 561. Sealing strip; 57. Annular limiting plate; 58. Annular slot; 59. First spring; 6. Switching unit; 61. Annular sliding plate; 611. Sealing gasket; 62. Linkage 63. Rod; 64. Bracket; 65. Guide rod; 66. Second spring; 67. Traction cable; 68. Winding shaft; 69. Transmission component; 70. Motor; 71. Vibration mechanism; 72. Radial groove; 73. Insert rod; 74. Vibration head; 75. Protrusion; 76. Third spring; 77. Mounting cavity; 78. End face cam; 79. Protrusion; 70. Flat part; 71. Screw; 72. Roller; 8. Pulse jet blowing equipment. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, refer to Figures 1-2 The present invention provides a dust treatment device based on powder coating production, including a housing 1, an air inlet 2, an exhaust port 3, a dust discharge port 4 disposed on the housing 1, and a pulse jet cleaning device 8 disposed on the housing 1. The function of the pulse jet cleaning device 8 is to inject high-pressure compressed air into the filter cartridge 53. The air inlet 2 is disposed on the side of the housing 1 near the bottom, the exhaust port 3 is disposed on the top of the housing 1, and the dust discharge port 4 is located at the bottom of the housing 1.

[0021] Reference Figures 2-5The housing 1 is also equipped with a filter assembly 5. The filter assembly 5 includes an upper sealing plate 51 and a lower sealing plate 52 fixed at the upper and lower positions inside the housing 1. Four sets of filter cartridges 53 are symmetrically arranged between the upper sealing plate 51 and the lower sealing plate 52. The upper sealing plate 51 and the lower sealing plate 52 are respectively provided with upper vent holes 541 and lower vent holes 542 at the upper and lower ends of each set of filter cartridges 53. In order to realize the switching of airflow direction, the upper sealing plate 51 and the lower sealing plate 52 are also provided with arc-shaped channels 55 around the upper vent holes 541 and lower vent holes 542. Each set of arc-shaped channels 55 is movably provided with a baffle 56 on the outside. The function of the baffle 56 is to control the opening and closing of the arc-shaped channel 55, thereby controlling the direction of airflow. Reference Figure 4 Each filter cartridge 53 is equipped with a switching unit 6. The switching unit 6 includes an annular slide plate 61 that is slidably disposed inside the filter cartridge 53. The annular slide plate 61 can move up and down along the axis of the filter cartridge 53. The upper and lower sides of the annular slide plate 61 are symmetrically fixed with linkage rods 62.

[0022] When the annular slide plate 61 moves to the top of the filter cartridge 53, the linkage rod 62 on its upper side abuts against the baffle 56 at the upper sealing plate 51 and pushes open the baffle 56 at the upper sealing plate 51, so that the upper arc-shaped channel 55 is opened. At this time, the annular slide plate 61 blocks the upper vent 541, forcing the dust-laden airflow to enter the interior of the filter cartridge 53 from the lower vent 542 at the bottom of the filter cartridge 53. Under the action of pressure difference, the dust-laden airflow passes upward through the inner filter wall of the filter cartridge 53, and the dust particles are trapped in the inner filter wall of the filter cartridge 53. The clean gas is discharged through the arc-shaped channel 55 at the upper sealing plate 51.

[0023] Conversely, when the annular slide plate 61 moves to the bottom of the filter cartridge 53, its lower linkage rod 62 abuts against the baffle 56 at the lower sealing plate 52 and pushes open the baffle 56 at the lower sealing plate 52, opening the arc-shaped channel 55 below. At this time, the annular slide plate 61 blocks the lower vent 542, forcing the dust-laden airflow to enter the outer space of the filter cartridge 53 from the arc-shaped channel 55 at the lower sealing plate 52. Under the action of pressure difference, the dust-laden airflow passes upward through the outer filter wall of the filter cartridge 53, and the dust particles are trapped on the outer filter wall of the filter cartridge 53. The clean gas is discharged through the upper vent 541 at the top of the filter cartridge 53. By switching between the above two modes, the filter cartridge 53 can realize the change of air intake direction, thereby periodically forming a bidirectional impact on the inner and outer filter walls of the filter cartridge 53 to achieve the backwashing effect.

[0024] Specifically, refer to Figures 5-7Each set of baffles 56 has an annular limiting plate 57 fixed on its inner side. The upper sealing plate 51 and the lower sealing plate 52 are provided with annular slots 58 corresponding to the annular limiting plate 57. The annular limiting plate 57 is movably inserted into the corresponding annular slot 58, and a first spring 59 is provided between the annular limiting plate 57 and the annular slot 58. When the linkage rod 62 pushes open the baffle 56, the first spring 59 is stretched. When the linkage rod 62 leaves the baffle 56, the elastic force of the first spring 59 will cause the baffle 56 to return to its original position, ensuring that the arc-shaped channel 55 can be reliably closed when not needed.

[0025] Reference Figure 10 To improve the sealing performance of the annular slide plate 61, sealing gaskets 611 are provided on the upper and lower end faces of the annular slide plate 61. The sealing gaskets 611 are used to achieve a seal when blocking the upper vent 541 or lower vent 542. The sealing gaskets 611 are made of elastic material, and their function is to form an effective seal when the annular slide plate 61 blocks the upper vent 541 or lower vent 542. Meanwhile, referring to… Figure 7 A sealing strip 561 is provided on the inner side of the baffle 56. The sealing strip 561 is used to make tight contact with the periphery of the corresponding arc-shaped channel 55 when the baffle 56 is closed, forming a seal and further improving the overall airtightness of the device.

[0026] See Figures 8-9 The switching unit 6 also includes a bracket 63 fixed in the upper vent 541 and lower vent 542, a guide rod 64 fixed on the upper bracket 63, and a second spring 65 disposed between the annular slide plate 61 and the bracket 63. The second spring 65 is sleeved on the guide rod 64 and provides an upward restoring force, which helps the annular slide plate 61 to move stably. A traction cable 66 is fixed to the bottom of the annular slide plate 61. Two sets of winding shafts 67 are rotatably disposed in the housing 1 through bearings. The free end of the traction cable 66 is wound around the corresponding winding shaft 67. A transmission component 68 is disposed between the two sets of winding shafts 67. The transmission component 68 can be a pulley and a transmission belt to synchronously drive the two sets of winding shafts 67 to rotate. A motor 69 is installed on the housing 1. The output end of the motor 69 is fixedly connected to one of the winding shafts 67. The motor 69 drives the winding shafts 67 to rotate forward and backward, thereby controlling the annular slide plate 61 to rise and fall in the filter cartridge 53 by winding and releasing the traction cable 66.

[0027] See Figures 10-13The present invention provides a vibration mechanism 7 on an annular slide plate 61. The vibration mechanism 7 includes a plurality of radial grooves 71 evenly distributed along the circumference of the annular slide plate 61, a rod 72 slidably disposed in each radial groove 71, and a vibration head 73 fixed to the outer end of the rod 72. A cam 74 is fixedly connected to the rod 72. A third spring 75 acting on the cam 74 is provided in the radial groove 71. The third spring 75 is sleeved on the outside of the rod 72 and provides a restoring force for the rod 72. When the vibration head 73 is pushed out and completes the hammering, the spring force will pull the rod 72 back to its original position.

[0028] Furthermore, the annular slide plate 61 has a mounting cavity 76 at its center. An end face cam 77 is rotatably connected to the mounting cavity 76 via a bearing. A screw 78 is fixedly connected to the bottom end of the guide rod 64. The screw 78 extends downward and is fixed to the lower bracket 63. The annular slide plate 61 is slidably sleeved on the outside of the screw 78. The end face cam 77 has a threaded hole at its center that mates with the screw 78. The inner end of the insertion rod 72 extends into the mounting cavity 76 and contacts the working surface of the end face cam 77. When the annular slide plate 61 moves up and down, the end face cam 77 rotates due to the thread action of the screw 78. Its working surface periodically pushes the insertion rod 72 outward, causing the vibrating head 73 to hammer the inner wall of the filter cartridge 53. The linear motion of the annular slide plate 61 is converted into the rotational motion of the end face cam 77, thereby driving the vibrating head 73 to reciprocate.

[0029] To reduce friction between the insert rod 72 and the working surface of the end face cam 77, a roller 79 is installed at the inner end of the insert rod 72 via a rotating shaft. The roller 79 slides in contact with the working surface of the end face cam 77, and the roller 79 converts sliding friction into rolling friction, effectively reducing wear.

[0030] The working surface of the end face cam 77 is a closed-loop curved surface formed by alternating protrusions 771 and flat parts 772 along the circumference, which allows the insertion rod 72 to be periodically pushed out and reset, so that the vibrating head 73 can perform multi-point and continuous hammering on the filter cartridge 53 to ensure the comprehensiveness of dust removal. The protrusions 771 are responsible for pushing the insertion rod 72 outward to generate hammering force, while the flat parts 772 allow the insertion rod 72 to be reset under the action of the third spring 75. Furthermore, by adjusting the shape and number of the protrusions 771 and flat parts 772, the frequency and force of vibration can be controlled to meet the dust removal needs of different types of powder coating dust.

[0031] Example 2: The present invention also provides a dust treatment process based on powder coating production, comprising the following steps according to a dust treatment device based on powder coating production: Step 1: Normal filtration stage. Dust-laden airflow enters the housing 1 through the air inlet 2, is filtered by the filter cartridge 53, the dust is trapped, and the clean air is discharged from the exhaust port 3. Step 2: Dust removal triggering stage. When the system pressure difference reaches the set value or the predetermined time is reached, the dust removal program is triggered. The pulse jet cleaning device 8 is started to inject high-pressure gas into the filter cartridge 53 for preliminary dust removal. Step 3: Deep cleaning stage. Drive motor 69 starts and pulls annular slide plate 61 to move once inside filter cartridge 53 via traction cable 66. During this process, the movement of annular slide plate 61 changes the air intake direction of filter cartridge 53. At the same time, the rotation of end face cam 77 drives vibrating head 73 to perform multi-point and periodic hammering on the inner wall of filter cartridge 53, shaking off the condensed dust. Step 4: Filtration recovery stage. After dust removal is completed, the annular slide plate 61 returns to its initial position, and the baffle 56 returns to its original position under the action of the spring, closing the arc-shaped channel 55 and restoring the normal filtration stage. The removed dust is discharged from the dust outlet 4.

[0032] The working principle of the dust treatment device and process based on powder coating production provided by this invention is as follows: First, dust is captured through the normal filtration stage. The dust-laden airflow enters the housing 1 through the air inlet 2. Since the annular slide plate 61 is at the top of the filter cartridge 53, it blocks the upper vent 541. At the same time, the upper linkage rod 62 pushes open the baffle 56 at the upper sealing plate 51, opening the upper arc-shaped channel 55. The dust-laden airflow enters the housing 1 through the air inlet 2. Since the upper vent 541 is blocked by the annular slide plate 61, the lower arc-shaped channel 55 is closed. The dust-laden airflow is forced to enter the interior of the filter cartridge 53 through the lower vent 542 at the bottom of the filter cartridge 53 and pass upward through the inner filter wall of the filter cartridge 53, that is, from the inside to the outside of the filter cartridge 53. The dust particles are effectively trapped in the inner filter wall of the filter cartridge 53. Through the filtration effect, the purified clean gas is discharged through the upper arc-shaped channel 55 and finally discharged outward from the exhaust port 3.

[0033] As the filtration time increases, the dust accumulated inside the filter cartridge 53 gradually increases, forming a filter cake layer. This causes the resistance to passing through the filter cartridge 53 to gradually increase. When the system differential pressure monitoring value reaches the preset dust removal setting value or the preset dust removal time interval, the control system will trigger the dust removal program. As a preliminary dust removal measure, the pulse jet cleaning device 8 is started. Controlled by the solenoid valve, high-pressure pulse compressed air is injected into the filter cartridge 53, which is in normal filtration state, shaking off the loose dust and filter cake attached to the filter cartridge 53. The dust is discharged from the dust outlet 4 under the action of gravity.

[0034] After the initial dust removal, in order to more thoroughly remove the sticky dust deeply embedded in the filter cartridge 53 and prevent dust from caking, the motor 69 is started, and the annular sliding plate 61 is pulled smoothly once inside the filter cartridge 53 via the traction cable 66. During this process: When the annular slide plate 61 moves downward from the top to the bottom position inside the filter cartridge 53, its lower linkage rod 62 will push open the baffle 56 at the lower sealing plate 52, opening the lower arc-shaped channel 55. At the same time, the annular slide plate 61 blocks the lower vent 542, and the upper arc-shaped channel 55 is closed. At this time, the dust-laden airflow inside the housing 1 will enter the outer space of the filter cartridge 53 from the arc-shaped channel 55 at the lower sealing plate 52. Then, under the action of pressure difference, the dust-laden airflow passes upward through the outer filter wall of the filter cartridge 53, that is, from the outside to the inside of the filter cartridge 53. The dust particles are trapped on the outer filter wall of the filter cartridge 53. The clean gas filtered by the filter cartridge 53 is then discharged into the clean air chamber through the upper vent 541 at the top of the filter cartridge 53, realizing the backwashing effect of the filter cartridge 53. After that, the annular slide plate 61 is controlled to move upward from the bottom of the filter cartridge 53 to realize the periodic switching of airflow direction.

[0035] At the same time, due to the up-and-down movement of the annular slide plate 61 on the screw 78, the end face cam 77 rotates under the action of the thread. The working surface of the end face cam 77 periodically pushes the insert rod 72 outward, so that the vibrating head 73 hammers the inner wall of the filter cartridge 53 at multiple points in a regular manner. This can effectively loosen and peel off the sticky and hardened dust that is difficult to remove by pulse cleaning. Especially for powder coating dust that forms a hard crust, the interaction between vibration and airflow switching can remove the dust from the filter cartridge 53 to the greatest extent.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dust treatment device based on powder coating production, comprising a housing (1), an air inlet (2), an exhaust outlet (3), a dust outlet (4) disposed on the housing (1), and a pulse jet cleaning device (8) disposed on the housing (1), characterized in that, The housing (1) is also provided with a filter assembly (5). The filter assembly (5) includes an upper sealing plate (51) and a lower sealing plate (52) fixed in the upper and lower positions inside the housing (1). Four sets of filter cartridges (53) are symmetrically arranged between the upper sealing plate (51) and the lower sealing plate (52). The upper sealing plate (51) and the lower sealing plate (52) are respectively provided with an upper vent hole (541) and a lower vent hole (542) at the upper and lower ends of each set of filter cartridges (53). The upper sealing plate (51) and the lower sealing plate (52) are also provided with arc-shaped channels (55) around the upper vent hole (541) and the lower vent hole (542). Each set of arc-shaped channels (55) is movably provided with a baffle (56) on the outside. Each filter cartridge (53) is equipped with a switching unit (6). The switching unit (6) includes an annular sliding plate (61) that is slidably disposed inside the filter cartridge (53). The upper and lower sides of the annular sliding plate (61) are symmetrically fixed with linkage rods (62). When the annular sliding plate (61) moves to the top of the filter cartridge (53), the linkage rod (62) on its upper side pushes open the baffle (56) at the upper sealing plate (51), opening the upper arc-shaped channel (55). At the same time, the annular sliding plate (61) blocks the upper vent (541), forcing the dust-laden airflow to enter from the lower vent (542). When the annular sliding plate (61) moves to the bottom of the filter cartridge (53), the linkage rod (62) on its lower side pushes open the baffle (56) at the lower sealing plate (52). At the same time, the annular sliding plate (61) blocks the lower vent (542), forcing the dust-laden airflow to enter from the lower arc-shaped channel (55).

2. The dust treatment device based on powder coating production according to claim 1, characterized in that, Each set of baffles (56) has an annular limiting plate (57) fixed on its inner side. The upper sealing plate (51) and the lower sealing plate (52) are provided with annular slots (58) corresponding to the annular limiting plate (57). The annular limiting plate (57) is movably inserted into the corresponding annular slot (58), and a first spring (59) is provided between it and the annular slot (58).

3. The dust treatment device based on powder coating production according to claim 1, characterized in that, The switching unit (6) also includes a bracket (63) fixed in the upper vent (541) and lower vent (542), a guide rod (64) fixed on the upper bracket (63), and a second spring (65) set between the annular slide plate (61) and the bracket (63). The second spring (65) is sleeved on the guide rod (64). A traction cable (66) is fixed at the bottom of the annular slide plate (61). Two sets of winding shafts (67) are rotatably arranged inside the housing (1). The free end of the traction cable (66) is wound around the corresponding winding shaft (67). A transmission component (68) is arranged between the two sets of winding shafts (67). A motor (69) is installed on the housing (1). The motor (69) drives the winding shaft (67) to rotate forward and backward, thereby controlling the annular slide plate (61) to rise and fall inside the filter cartridge (53) by raising and lowering the traction cable (66).

4. The dust treatment device based on powder coating production according to claim 3, characterized in that, The annular slide plate (61) is provided with a vibration mechanism (7). The vibration mechanism (7) includes a plurality of radial grooves (71) evenly distributed along the circumference of the annular slide plate (61), a rod (72) slidably disposed in each radial groove (71), and a vibration head (73) fixed to the outer end of the rod (72). A cam (74) is fixedly connected to the rod (72). A third spring (75) acting on the cam (74) is provided in the radial groove (71). The third spring (75) is sleeved on the outside of the rod (72).

5. The dust treatment device based on powder coating production according to claim 4, characterized in that, The annular slide plate (61) has a mounting cavity (76) at its center. An end face cam (77) is rotatably connected to the mounting cavity (76) via a bearing. A screw (78) is fixedly connected to the bottom end of the guide rod (64). The screw (78) extends downward and is fixed to the lower bracket (63). The end face cam (77) has a threaded hole at its center that mates with the screw (78). The inner end of the insert rod (72) extends into the mounting cavity (76) and contacts the working surface of the end face cam (77). When the annular slide plate (61) moves up and down, the end face cam (77) rotates due to the thread action of the screw (78), and its working surface periodically pushes the insert rod (72) outward, causing the vibrating head (73) to hammer the inner wall of the filter cylinder (53).

6. The dust treatment device based on powder coating production according to claim 5, characterized in that, The inner end of the insert rod (72) is equipped with a roller (79) via a rotating shaft, and the roller (79) slides in contact with the working surface of the end face cam (77).

7. The dust treatment device based on powder coating production according to claim 6, characterized in that, The working surface of the end face cam (77) is a closed loop surface composed of protrusions (771) and flat parts (772) that are alternately distributed along the circumference.

8. The dust treatment device based on powder coating production according to claim 1, characterized in that, The annular slide plate (61) is provided with sealing gaskets (611) on its upper and lower end faces. The sealing gaskets (611) are used to achieve sealing when they block the upper vent (541) or the lower vent (542).

9. The dust treatment device based on powder coating production according to claim 1, characterized in that, The inner side of the baffle (56) is provided with a sealing strip (561), which is used to form a seal with the periphery of the corresponding arc-shaped channel (55) when the baffle (56) is closed.

10. A dust treatment process based on powder coating production, and the dust treatment device based on powder coating production according to claim 5, characterized in that, Includes the following steps: Step 1: Normal filtration stage, the dust-laden airflow enters the housing (1) through the air inlet (2), is filtered through the filter cartridge (53), the dust is trapped, and the clean air is discharged from the exhaust port (3); Step 2: Dust removal triggering stage. When the system pressure difference reaches the set value or the predetermined time is reached, the dust removal program is triggered. The pulse jet cleaning device (8) is started to spray high-pressure gas into the filter cartridge (53) for preliminary dust removal. Step 3: Deep cleaning stage. The drive motor (69) is started and the annular slide plate (61) is pulled by the traction cable (66) to move once inside the filter cartridge (53). During this process, the movement of the annular slide plate (61) changes the air intake direction of the filter cartridge (53). At the same time, the rotation of the end face cam (77) drives the vibrating head (73) to perform multi-point and periodic hammering on the inner wall of the filter cartridge (53) to shake off the condensed dust. Step 4: Restore the filtration stage. After the dust removal is completed, the annular slide plate (61) is reset to the initial position, and the baffle (56) is reset and closed under the action of the spring to close the arc channel (55), and the normal filtration stage is restored. The removed dust is discharged from the dust outlet (4).

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