Laser dust removal equipment and dust removal process with air knife type internal circulation backwashing system

Abstract

The present invention relates to a laser dust removal device and dust removal process with a built-in air knife type internal circulation backwashing system. The device includes a casing, a primary filter assembly, a multi-stage electrostatic field and an internal circulation backwashing system, wherein the internal circulation backwashing system includes a flushing air knife unit and a dust collection unit, the flushing air knife unit includes an air knife whose air outlet is parallel to or intersecting with the electrode sheet of the electrostatic field area; the dust collection unit includes a dust collection filter bag that seals the opening of the dust collection area from the bag mouth to form a dust collecting chamber, and a circulating fan, wherein the air outlet end of the circulating fan is connected to the air knife to form an internal circulation of the flushing airflow. On the one hand, the present invention integrates dust removal and self-cleaning together, and the two do not interfere with each other, and under primary filtration and electrostatic dust removal, the probability of airflow channel blockage is small, the wind resistance is small, the energy consumption is low, and the filtering effect is good; on the other hand, the use of internal circulation airflow not only facilitates self-cleaning, but also avoids the phenomenon of low cleaning efficiency caused by external airflow intervention.

Description

Technical Field

[0001] The present invention belongs to the field of dust removal equipment, and in particular relates to a laser dust removal device with an air knife type internal circulation backwashing system, and also relates to a dust removal process. Background Art

[0002] During actual production operations, production equipment often produces a large amount of polluted gases such as oil mist or dust, which poses a great threat to the working environment and the personal health of operators. Therefore, it is necessary to centrally purify the gases generated by production equipment.

[0003] For example, when it comes to dust, the most commonly used dust removal equipment is cartridge or bag type dust removal. Although it can meet the needs of intercepting and filtering dust particles, it has an obvious defect: the filter layer used is easily clogged, resulting in large wind resistance, poor filtering effect, and high energy consumption. At the same time, the filter layer needs to be disassembled for separate cleaning, so the operation is extremely inconvenient. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a new laser dust removal device with a built-in air knife type internal circulation backwashing system.

[0005] It also relates to a dust removal process using laser dust removal equipment.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A laser dust removal device with an air knife type internal circulation backwashing system, comprising:

[0008] The housing has a cavity therein and has an air inlet and an air outlet, wherein the cavity is divided into a pre-treatment area, an electrostatic field area, and a dust collection area which are connected to each other, the air inlet is connected to the pre-treatment area, and the electrostatic field area is connected to the air outlet;

[0009] A primary filter component, which is intercepted in the pretreatment area;

[0010] Multi-level electrostatic field, which is intercepted in the electrostatic field area;

[0011] An internal circulation backwash system includes a flushing air knife unit and a dust collection unit, wherein the flushing air knife unit is located between the electrostatic field area and the air outlet, and includes an air knife arranged parallel to or intersecting with the electrode sheet of the air outlet and the electrostatic field area; the dust collection unit includes a dust collection filter bag that seals the opening of the dust collection area from the bag mouth and forms a dust collecting cavity, and a circulating fan whose air inlet end is connected to the dust collection area, wherein the air outlet end of the circulating fan is connected to the air knife to form an internal circulation of the flushing airflow.

[0012] Preferably, the pretreatment zone and the electrostatic field zone are located on opposite sides and connected from the bottom, and the dust collection zone is located below the area where the pretreatment zone and the electrostatic field zone are connected. The layout of these zones not only makes the structure compact, but also prevents dust removal and flushing from interfering with each other, thus facilitating implementation.

[0013] According to a specific embodiment and preferred aspect of the present invention, an airflow combing zone is formed above the dust collection zone, and the airflow combing zone is connected from the top to the pretreatment zone and the electrostatic field zone on both sides. The airflow combing zone is gradually reduced in size from top to bottom, and a diverter plate is also provided within the airflow combing zone, which bends from top to bottom toward the electrostatic field zone. With the airflow combing zone configured, during dust removal, the airflow after being filtered by the primary filter assembly can be evenly directed to the electrostatic field zone, reducing turbulence and improving dust removal quality. During backwashing, the downward airflow can be directed to the bag opening, preventing the airflow from flowing into the pretreatment zone, thereby facilitating dust cleaning of the electrode sheet.

[0014] Preferably, the upper end of the diverter plate is fixed at the separation between the electrostatic field zone and the pretreatment zone, and the lower end is located between the bag opening and the electrostatic field zone. The distance from the lower end of the diverter plate to the bag opening is L1, and the distance between the electrostatic field zone and the bag opening is L2, where 0.2L2≤L1≤0.8L2. In this case, determining the position of the diverter plate also achieves the technical objectives of optimal dust removal and self-cleaning.

[0015] According to another specific embodiment and preferred aspect of the present invention, the air outlet of the air knife is located directly above the electrostatic field area, and the flushing air knife unit further includes a drive mechanism for driving the air knife to reciprocate along the length or width of the electrostatic field area, wherein the air outlet covers each electrode sheet above the electrostatic field area, and the flushing area formed by the reciprocating movement of the air knife covers the electrode sheets above the electrostatic field area. In other words, a single air knife is used, and the surface of each electrode sheet in the electrostatic field area is gradually self-cleaned under the sweeping movement of the air knife.

[0016] Preferably, the air outlet is positioned perpendicular to the electrode sheet, and the air knife reciprocates along the length of the electrode sheet. The drive mechanism includes a slide rail positioned above the electrostatic field region and configured to reciprocate the air knife, and a power element. Driven by the power element, the air knife reciprocates along the slide rail. The air knife is optimally angled to sweep away dust from the surface of the electrode sheet, and the cleaning is gradually completed as the air knife sweeps horizontally.

[0017] Furthermore, a slide is provided on the wind knife, and the slide is slidably arranged on a slide rail. The power member includes a power screw arranged parallel to the slide rail and a power motor driving the power screw to rotate. The power screw cooperates with the slide, and the slide moves linearly along the slide rail under the rotation of the power screw. The structure is simple and easy to implement.

[0018] According to another specific embodiment and preferred aspect of the present invention, the dust collection filter bag has multiple dust collection cavities arranged side by side, and the bottom of the dust collection filter bag is separated from the dust collection area; the cavity also includes a fan positioning compartment arranged at the bottom of the dust collection area, wherein a flow equalizing plate for connecting the dust collection area with the air inlet is also provided at the bottom of the dust collection area, and the circulating fan is located in the fan positioning compartment. The bottom of the dust collection filter bag is separated from the dust collection area, and the flow equalizing plate is provided to avoid deformation of the dust collection filter bag during negative pressure adsorption, thereby affecting dust collection during self-cleaning and reducing cleaning efficiency and quality.

[0019] Preferably, an exhaust fan is installed at the top of the electrostatic field area, with the air outlet coming out from one side of the top of the housing, and the air inlet and outlet located on the same side, and the air inlet is located below the air outlet. This layout makes the airflow during dust removal smoother and meets the requirements of special places such as wall surfaces.

[0020] Furthermore, the housing is equipped with an upper mounting frame and a lower mounting frame. The primary filter assembly includes a filter element that is tilted in the pretreatment area and has its upper and lower ends slidably mounted on the upper and lower mounting frames, respectively. This makes the filter element, like a drawer, very easy to install and remove.

[0021] The electrostatic field area has a multi-level electrostatic field distributed from top to bottom. In this example, each level of the electrostatic field is composed of two groups of electrode sheets, where the spacing between the electrode sheets in the lower group is larger than the spacing between the electrode sheets in the upper group. In this way, during dust removal, it is not only convenient for gas circulation, but also convenient for electrostatic adsorption of particles of different particle sizes; during self-cleaning, the purge airflow can fit the surface of each electrode sheet to improve and enhance the purge cleaning effect.

[0022] Another technical solution of the present invention is: a dust removal process, which uses the above-mentioned laser dust removal equipment and includes the following steps:

[0023] S1. The gas to be dusted enters the casing from the air inlet and is filtered by the primary filter component, intercepting some large-size dust particles, and the primary filtered airflow flows towards the electrostatic field area;

[0024] S2. The airflow entering the electrostatic field flows through multiple electrostatic fields in sequence to undergo electrostatic adsorption, and the airflow after adsorption is discharged from the air outlet;

[0025] S3. When the electrostatic field needs to be cleaned, stop the airflow from the air inlet, and turn on the circulating fan. The dust collection area is in a negative pressure state. The airflow blown out by the circulating fan passes through the wind knife and is swept to the electrode sheets of the multi-stage electrostatic field. The blown dust falls into the dust collection filter bag below with the flow of the airflow. After the airflow is filtered by the dust collection filter bag, the dust falls into the dust collection filter bag, and the filtered gas flows back to the circulating fan to form an internal circulating airflow to self-clean the electrode sheets.

[0026] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0027] On the one hand, the present invention integrates dust removal and self-cleaning without interfering with each other. Under the primary filtration and electrostatic dust removal, the probability of air flow channel blockage is small, the wind resistance is small, the energy consumption is low, and the filtering effect is good. On the other hand, in the self-cleaning process, the internal circulation airflow is adopted, which not only facilitates the self-cleaning of the electrostatic field area, but also avoids the occurrence of low cleaning efficiency or poor cleaning effect due to the intervention of external airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the electrostatic dust removal equipment of the present invention;

[0029] Figure 2 for Figure 1 Exploded diagram of the structure;

[0030] Figure 3 for Figure 1 Structural decomposition diagram (another perspective);

[0031] Where: 1, housing; k1, air inlet; k2, air outlet; q1, pretreatment area; q2, electrostatic field area; q3, dust collection area; f, air flow combing area; t, joint; q4, air outlet cavity; c, exhaust fan; a1, upper mounting frame; a2, lower mounting frame;

[0032] 2. Primary filter assembly; 20. Filter element;

[0033] 3. electrostatic field; p, electrode sheet;

[0034] 4. Internal circulation backwash system; 40. Flushing air knife unit; 400. Air knife; k3. Air outlet; 401. Driving mechanism; 4010. Slide rail; 4011. Power part; h. Slide seat; s. Power screw; m. Power motor; 41. Dust collection unit; 410. Diverter plate; 411. Flow equalizing plate; 412. Dust collection filter bag; 413. Fan positioning bin; 4130. Bin bottom plate; 4131. Bin side plate; 4132. Bin door; 414. Circulation fan; g. Circulation pipeline. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0040] like Figure 1 and Figure 2 As shown, the laser dust removal equipment of this embodiment includes a housing 1, a primary filter component 2, an electrostatic field 3, and an internal circulation backwashing system 4.

[0041] Specifically, the housing 1 has a cavity inside and has an air inlet k1 and an air outlet k2, wherein the cavity is divided into a connected pretreatment area q1, an electrostatic field area q2, and a dust collection area q3, the air inlet k1 is connected to the pretreatment area q1, and the electrostatic field area q2 is connected to the air outlet k2.

[0042] Combine Figure 3 As shown, the pretreatment zone q1 and the electrostatic field zone q2 are located on opposite sides and connected from the bottom. The dust collection zone q3 is located below the area where the pretreatment zone q1 and the electrostatic field zone q2 are connected. This layout of the zones not only creates a compact structure, but also prevents dust removal and flushing from interfering with each other, making it easier to implement.

[0043] Specifically, the opening of the dust collection zone q3 and the area connected to the pretreatment zone q1 and the electrostatic field zone q2 form an airflow combing zone f, where the airflow combing zone f is gradually reduced in size from top to bottom. This arrangement allows the airflow combing zone to direct the airflow into the dust collection zone during flushing.

[0044] At the same time, an air outlet cavity q4 is formed at the top of the housing 1, communicating with the outside from one side. An exhaust fan c is also installed within the air outlet cavity q4, above the electrostatic field region q2. The air outlet k2 is located on one side of the air outlet cavity q4 and on the same side as the air inlet k1, with the air outlet k2 located above the air inlet k1. This layout ensures smoother airflow during dust removal and is suitable for special locations such as wall surfaces.

[0045] For ease of implementation, an upper mounting frame a1 and a lower mounting frame a2 are provided within the housing 1. The primary filter assembly 2 includes a filter element 20 that is tilted within the pretreatment zone q1 and has its upper and lower ends slidably mounted on the upper mounting frame a1 and the lower mounting frame a2, respectively. This allows the filter element to be easily installed and removed, like a drawer.

[0046] There are two electrostatic fields 3, and the two electrostatic fields 3 are distributed from top to bottom in the electrostatic field area q2 and are fixedly connected to the casing 1 by bolts. Each level of the electrostatic field 3 is composed of two groups of electrode sheets p, and the spacing between the electrode sheets p in the lower group is larger than the spacing between the electrode sheets p in the upper group. In this way, during dust removal, it is not only convenient for the circulation of gas, but also convenient for the electrostatic adsorption of particles of different particle sizes; during self-cleaning, the purge airflow can fit the surface of each electrode sheet to improve and enhance the purge cleaning effect.

[0047] The internal circulation backwashing system 4 includes a flushing air knife unit 40 located above the electrostatic field area q2 and a dust collection unit 41 located below the electrostatic field area q2.

[0048] Flushing air knife unit 40 is located between electrostatic field region q2 and exhaust fan c. It includes an air knife 400 and a drive mechanism 401 that drives air knife 400 back and forth along the width of electrostatic field region q2. This arrangement allows a single air knife to gradually purge the electrostatic field region, preventing airflow interference between multiple air knives and improving dust removal within the electrostatic field region. Furthermore, the air output of a single air knife is easily controlled, resulting in low energy consumption and cost.

[0049] In this example, the air outlet k3 of the air knife 400 is located directly above the electrostatic field region q2 and is arranged perpendicular to the electrode sheet p. The air knife 400 reciprocates along the length of the electrode sheet p. This arrangement allows the air knife to simultaneously sweep multiple electrode sheets, and a guide area is formed between each adjacent electrode sheet, allowing dust to be blown away quickly and improving flushing efficiency.

[0050] Specifically, the air outlet k3 of the air knife 400 radiates air to each electrode sheet p above the electrostatic field region q2, and the reciprocating motion of the air knife 400 forms a flushing area that completely covers the electrode sheets p above the electrostatic field region q2. This arrangement ensures that each electrode sheet within the electrostatic field region is thoroughly flushed, improving the flushing effect.

[0051] The driving mechanism 401 includes a slide rail 4010 disposed above the electrostatic field region q2 and providing reciprocating motion for the air knife 400 , and a power member 4011 , wherein driven by the power member 4011 , the air knife 400 reciprocates along the slide rail 4010 .

[0052] Specifically, a slide h is provided on the air knife 400, and the slide h is slidably mounted on a slide rail 4010. The power element 4011 includes a power screw s arranged parallel to the slide rail 4010 and a power motor m that drives the power screw s to rotate. The power screw s cooperates with the slide h, and under the rotation of the power screw s, the slide h moves linearly along the slide rail 4010, thereby driving the air knife 400 to reciprocate along the slide rail 4010. This arrangement ensures a stable and reliable screw drive, and when the power motor outputs steadily, it can ensure that the air knife reciprocates at a uniform speed, blowing evenly.

[0053] The dust collection unit 41 includes a diverter plate 410, a flow equalizing plate 411, a dust collection filter bag 412 that seals the opening of the dust collection area q3 from the bag mouth and forms a dust collecting chamber j, a fan positioning bin 413 arranged at the bottom of the dust collection area q3, and a circulating fan 414 positioned in the fan positioning bin 413 and connected to the dust collection area q3.

[0054] The diverter plate 410 is set in the air flow combing area f and bends from top to bottom toward the electrostatic field area q2. The upper end of the diverter plate 410 is fixed to one side of the bottom of the electrostatic field area q2, and the lower end is located between the bag opening of the dust collection filter bag 412 and the electrostatic field area q2. With this arrangement, under the setting of the air flow combing area, when dust is removed, the airflow after being filtered by the primary filter assembly can be evenly directed to the electrostatic field area, reducing turbulence and improving dust removal quality; when backwashing, the downward airflow can be directed to the bag opening to prevent the airflow from flowing into the pretreatment area, thereby facilitating dust cleaning of the electrode sheet.

[0055] In this example, the distance from the lower end of the diverter plate 410 to the bag opening is L1, and the distance between the electrostatic field region and the bag opening is L2, where L2 = 2L1. At this point, determining the position of the diverter plate also achieves the best technical purpose of dust removal and self-cleaning.

[0056] A flow equalizer plate 411 is located at the bottom of the dust collection area q3, and a joint t is provided at the bottom of the dust collection area q3. The joint t connects the flow equalizer cavity formed by the flow equalizer plate 411 to the air inlet of the circulating fan 414. This arrangement evenly disperses the airflow after passing through the flow equalizer plate, preventing deformation of the dust collection cavity j, which would affect dust collection during self-cleaning and reduce cleaning efficiency and quality.

[0057] Of course, another implementation involves connecting connector t directly to fan positioning chamber 413. In this case, fan positioning chamber 413 needs to be sealed. For optimal implementation, dust collection filter bag 412 includes multiple dust collection chambers j arranged side by side, with the bottom of dust collection filter bag 412 spaced apart from dust collection area q3. This arrangement prevents the bottom of the dust collection filter bag from contacting the bottom of the dust collection area and affecting dust removal efficiency under the negative pressure generated during flushing.

[0058] Specifically, each dust collecting chamber j is gradually smaller from top to bottom. Such an arrangement is conducive to the flow of airflow and improves the filtering efficiency. At the same time, dust is easily accumulated at the bottom of the dust collecting chamber, which is convenient for collecting dust.

[0059] The fan positioning chamber 413 includes a chamber bottom plate 4130, a chamber side plate 4131 extending upward from the sides of the chamber bottom plate 4130, and a chamber door 4132 disposed on one side of the chamber side plate 4131. The circulation fan 414 is positioned on the chamber bottom plate 4130 and located between the chamber side plate 4131 and the chamber door 4132. This arrangement results in a compact structure that is convenient for storage and transportation.

[0060] In addition, the air outlet end of the circulation fan 414 is connected to the air knife 400 through the circulation pipeline g to form an internal circulation of the flushing air flow.

[0061] In summary, the dust removal process of this embodiment is as follows:

[0062] The gas to be dust-removed enters the pretreatment area q1 from the air inlet k1, and the airflow continues to flow downward and passes through the filter element 20 obliquely placed in the pretreatment area q1 for preliminary screening. The screened airflow enters the electrostatic field area q2 under the guidance of the diverter plate 410, and passes through the two electrostatic fields 3 from bottom to top in sequence, and is extracted from the air outlet k2 at the top of the electrostatic field area q2, thereby completing the dust removal of the gas.

[0063] At the same time, the self-cleaning process of this embodiment is as follows:

[0064] The air inlet k1 and the air outlet k2 are closed, and the circulating fan 414 is operated. After the air flow flows into the wind knife 400 from the air outlet end of the circulating fan 414 through the circulation pipe g, the air flow blows downward from the air outlet k3 of the wind knife 400 to sweep the multiple electrode sheets p, and under the drive of the power motor m, the wind knife 400 reciprocates along the slide rail 4010, and gradually blows and cleans the entire electrostatic field area q2. At this time, the dust adhering to each electrode sheet p is blown off and falls into the dust collection filter bag 23 below with the flow of air. After the air flow is filtered by the dust collection filter bag 412, the dust falls into the dust collection filter bag 412, and the filtered gas passes through the flow equalizing plate 411 at the bottom and flows back to the circulating fan 414 to form an internal circulation.

[0065] Therefore, this embodiment has the following advantages:

[0066] 1. The dust removal and self-cleaning are integrated without interfering with each other. Under the conditions of primary filtration and electrostatic dust removal, the probability of air flow channel blockage is low, wind resistance is small, energy consumption is low, and the filtering effect is good.

[0067] 2. The use of internal circulation airflow not only facilitates the self-cleaning of the electrostatic field area, but also avoids the phenomenon of low cleaning efficiency or poor cleaning effect caused by the intervention of external airflow. At the same time, there is no need to dismantle the dust removal equipment, the operation is simple, and the self-cleaning efficiency is high;

[0068] 3. Under the setting of the diverter plate, when removing dust, the airflow after preliminary filtration can be evenly directed to the electrostatic field area, so that the airflow can smoothly perform electrostatic dust removal; during self-cleaning, the purge airflow can be directed to the filter bag to avoid the convergence and disorder of the airflow, further improving the self-cleaning efficiency;

[0069] 4. With the flow plate set, each dust collecting chamber is evenly stressed during self-cleaning, which is conducive to smooth airflow;

[0070] 5. The cleaning area formed by the horizontal sweep of the single air knife fully covers the top of the entire electrostatic field area, and can gradually achieve the surface of each electrode sheet to be cleaned without omission. At the same time, the air volume is easy to control, and the implementation is convenient, with low energy consumption and low cost. In addition, the horizontal movement of the air knife is stable, which can evenly achieve the surface cleaning of the electrode sheet.

[0071] 6. The vertical layout is adopted, through the mode of blowing up and sucking down, which greatly improves the speed of gas circulation and avoids the phenomenon of dust rising during blowing; at the same time, during the dust removal or self-cleaning process, the air flow is smooth, which is more conducive to the implementation of dust removal and self-cleaning.

[0072] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser dust removal device with an air knife type internal circulation backwashing system, characterized by: It includes: The housing has a cavity therein and has an air inlet and an air outlet, wherein the cavity is divided into a pre-treatment area, an electrostatic field area, and a dust collection area which are connected to each other, the air inlet is connected to the pre-treatment area, and the electrostatic field area is connected to the air outlet; A primary filter component, which is intercepted in the pretreatment area; Multi-level electrostatic field, which is intercepted in the electrostatic field area; An internal circulation backwashing system includes a flushing air knife unit and a dust collection unit, wherein the flushing air knife unit is located between the electrostatic field area and the air outlet, and includes an air knife arranged parallel to or intersecting with the electrode sheet of the electrostatic field area; the dust collection unit includes a dust collection filter bag that seals the opening of the dust collection area from the bag mouth to form a dust collecting cavity, and a circulating fan connected to the dust collection area with the air inlet end, wherein a flow equalizing plate for connecting the dust collection area with the air inlet end is also provided at the bottom of the dust collection area, and the bottom of the dust collection filter bag is separated from the dust collection area; the air outlet end of the circulating fan It is connected with the wind knife to form an internal circulation of the flushing airflow; an airflow combing area is formed above the dust collection area, and the airflow combing area is connected with the pretreatment area and the electrostatic field area on both sides from the top, wherein the airflow combing area is gradually reduced from top to bottom, and a diverter plate is also provided in the airflow combing area, which is bent from top to bottom and into the electrostatic field area, wherein the distance from the lower end of the diverter plate to the bag opening is L1, and the distance between the electrostatic field area and the bag opening is L2, wherein 0.2L2≤L1≤0.8L2, and during backwashing, the diverter plate can guide the downward airflow to the bag opening to avoid the airflow flowing into the pretreatment area.

2. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: The pretreatment area and the electrostatic field area are located on opposite sides and are connected from the bottom. The dust collection area is located below the area where the pretreatment area and the electrostatic field area are connected.

3. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: The upper end of the diverter plate is fixed at the separation between the electrostatic field area and the pretreatment area, and the lower end is located between the bag opening and the electrostatic field area.

4. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: The air outlet of the wind knife is located directly above the electrostatic field area, and the flushing wind knife unit also includes a driving mechanism for driving the wind knife to reciprocate along the length or width direction of the electrostatic field area, wherein the air outlet covers each of the electrode sheets on the upper part of the electrostatic field area, and the flushing area formed by the reciprocating motion of the wind knife covers the electrode sheets on the upper part of the electrostatic field area.

5. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 4 is characterized in that: The air outlet is arranged perpendicular to the electrode sheet, and the air knife reciprocates along the length direction of the electrode sheet.

6. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 4 is characterized in that: The driving mechanism includes a slide rail provided above the electrostatic field region and for the reciprocating motion of the wind knife, and a power member, wherein under the drive of the power member, the wind knife reciprocates along the slide rail.

7. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 6 is characterized in that: A slide is provided on the wind knife, and the slide is slidably arranged on the slide rail. The power component includes a power screw rod arranged parallel to the slide rail and a power motor driving the power screw rod to rotate. The power screw rod is matched with the slide seat, and under the rotation of the power screw rod, the slide seat moves linearly along the slide rail.

8. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: The dust collecting filter bag has a plurality of dust collecting cavities arranged side by side.

9. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: The cavity further includes a fan positioning bin arranged at the bottom of the dust collection area, wherein the circulation fan is located in the fan positioning bin.

10. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: An exhaust fan is provided on the top of the electrostatic field area. The air outlet is transmitted from one side of the top of the casing. The air inlet and the air outlet are located on the same side, and the air inlet is located below the air outlet.

11. The laser dust removal equipment with an air knife type internal circulation backwashing system according to claim 1 is characterized in that: An upper mounting frame and a lower mounting frame are provided in the casing, and the primary filter assembly comprises a filter element which is obliquely arranged in the pretreatment area and the upper and lower ends of which are slidably mounted on the upper mounting frame and the lower mounting frame respectively.

12. A dust removal process, characterized in that: It adopts the laser dust removal equipment according to any one of claims 1 to 11, and includes the following steps: S1. The gas to be dusted enters the casing from the air inlet and is filtered by the primary filter component, intercepting some large-size dust particles, and the primary filtered airflow flows towards the electrostatic field area; S2. The airflow entering the electrostatic field flows through multiple electrostatic fields in sequence to undergo electrostatic adsorption, and the airflow after adsorption is discharged from the air outlet; S3. When the electrostatic field needs to be cleaned, stop the airflow from the air inlet, and turn on the circulating fan. The dust collection area is in a negative pressure state. The airflow blown out by the circulating fan passes through the wind knife and is swept to the electrode sheets of the multi-stage electrostatic field. The blown dust falls into the dust collection filter bag below with the flow of the airflow. After the airflow is filtered by the dust collection filter bag, the dust falls into the dust collection filter bag, and the filtered gas flows back to the circulating fan to form an internal circulating airflow to self-clean the electrode sheets.

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