Side-insertion flat bag composite cleaning dust collector and filter material cleaning method thereof

Abstract

The present invention discloses a side-insertion flat-bag composite cleaning dust collector and its filter media cleaning method, belonging to the technical field of industrial dust control and pollution prevention equipment. Based on conventional flat-bag dust collectors, this device utilizes a mechanical scraping device in conjunction with a pneumatic pulse device to achieve technical innovations such as composite cleaning of the filter media surface, rapid online replacement of filter units, and batch-by-batch variable-speed scraping to accommodate varying filter media contamination conditions. Specifically, the device features a side-insertion arrangement with multiple compartments, each containing a removably mounted flat-bag filter unit for deep filtration of dust-laden gases. A mechanical scraping device is flexibly mounted on the filter media surface of the filter unit. This device, through threaded engagement, drives a scraping bar in reciprocating motion, providing fine scraping of the filter media. The scraping device and pneumatic pulse device work together to form a composite cleaning system. To reduce structural space, the scraping device also incorporates a reversing mechanism, enabling one set of devices to clean two adjacent filter units.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust removal, and specifically relates to industrial dust control and pollution prevention equipment technology.

[0002] As a new type of dust collector, the present invention has the following technical significance:

[0003] The mechanical composite cleaning technology of filter media is combined with mechanical scraping and pneumatic pulse technology to achieve all-round and high-intensity composite cleaning of the filter media surface, with significant filter media purification effect.

[0004] The side-insert structure technology adopts an independent compartment and layered side-insert structure, which realizes the online rapid replacement of single-compartment filter materials during the operation of the device, greatly improving the operating efficiency.

[0005] Batch variable speed transmission technology drives the scraping device in layers and at different speeds according to the number of filter material layers and pollution conditions, thus achieving the most optimized mechanical cleaning mode.

[0006] The multi-filter unit cleaning technology is equipped with a replacement auxiliary mechanism, so that one set of scraping device can clean two filter units, reducing the space occupied by the structure and lowering the manufacturing and maintenance costs.

[0007] The application fields of the present invention include: dust control and pollution prevention in industrial fields such as coal combustion flue gas desulfurization, fly ash treatment, cement production, fine chemicals, food processing, and powder coating production. Background Art

[0008] Industrial production generates large amounts of dust and dust-laden gases that require filtration and treatment in industrial dust collectors before discharge. Currently, the main treatment equipment is industrial side-insertion flat-bag composite cleaning dust collectors and industrial vertical bag pulse dust collectors. Side-insertion flat-bag dust collectors are widely used due to their compact structure, easy maintenance, quick bag replacement, and small footprint. However, their handling capacity is relatively small, limiting their application to small and medium-volume applications.

[0009] Chinese invention patent application publication number CN 112569714 A discloses a rotary back-flushing double-flat bag dust collector. This double-flat bag dust collector uses mechanical back-flushing and vibration to increase the dust removal rate from the flat bags, ensuring subsequent filtration effectiveness. Its structure includes a dust collection box, a support frame, a dust collection box, a fin assembly, ducting, two sets of flat bag filter units, and a vibrating drive mechanism. The support frame is fixedly connected to the dust collection box; symmetrical fins are arranged inside the box, dividing the space into two paths, each containing a set of flat bag filter units. Cam-spring vibration devices are symmetrically arranged on both sides to drive the mechanical oscillation of the filter bags. Back-flushing ducts are also provided to intermittently blow pulsed air to the filter bags.

[0010] This structure can improve dust removal from the filter bags. However, it also causes noise and high power consumption. Furthermore, since the flat bag filter unit is no longer fixed but movable, its seal with the housing cannot be guaranteed, potentially leading to air leaks.

[0011] To expand its application, a scraping device can be installed around the perimeter of the flat bag filter media. Combined with pulse jets, this device can provide a secondary cleansing mechanism for dust adhering to the filter media surface. This improves cleaning efficiency and effectively increases the unit throughput. This combined cleaning method, combining pulse jets with mechanical scraping, leverages the compact structure of the flat bag dust collector and expands its application. However, it should be considered that the filter units in the dust collection space of the dust collector are very tightly arranged, requiring the scraping device to be very small and its power supply to be external to the harsh environment of the dust collection space. Summary of the Invention

[0012] In view of this, the present invention provides a side-insertion flat bag composite cleaning dust collector, which realizes mechanical composite cleaning of filter bags and online rapid replacement of filter units, greatly improving operating efficiency and filter material cleaning effect.

[0013] The technical solution of the embodiments of the present invention is achieved as follows: a side-inserted flat-bag composite cleaning dust collector comprises a device housing, a support frame, an inlet, an air outlet, multiple flat-bag filter units, a pulse cleaning assembly, and an ash hopper. The multiple filter units are provided with support beams at their bases, and scraping devices are installed on the support beams between adjacent layers. The scraping devices comprise a vertical middle connecting rod, side connecting rods, and a mechanical cleaning actuator mounted on the support beams to achieve mechanical composite cleaning of the filter media surface. This technical solution, through the provision of the scraping devices, achieves mechanical composite cleaning of the filter media surface, improving dust removal efficiency.

[0014] Preferably, the plurality of filter units are arranged in multiple layers. The multi-layer filter structure of the preferred solution increases the processing flow rate per unit volume.

[0015] Preferably, a plurality of independent mounting compartments are provided in the device housing on one side of the plurality of flat bag filter units, so that the filter units can be replaced without stopping the machine. This preferred solution allows for quick replacement of the filter units, enabling continuous operation of the equipment without stopping.

[0016] Preferably, the device housing in the installation chamber is provided with an auxiliary operation port for removing and installing the flat bag filter unit. This preferred solution provides an auxiliary port to facilitate the removal and installation of the filter unit.

[0017] Preferably, the middle connecting rod is designed with a double-thread design with opposite rotation directions, while the side connecting rod is designed with a single-thread design with the rotation direction opposite to the rotation direction of the thread on the side opposite the adjacent middle connecting rod. This preferred solution combines the double and single threads to ensure synchronous movement of both sides of the scraping device.

[0018] Preferably, the mechanical cleaning actuator comprises a guide rod positioned on both sides of each flat bag filter unit; two main bodies; screw threads on the same side of each main body; a connecting rod connecting the two main bodies; and a scraping strip on the side opposite the screw threads. In this preferred embodiment, the guide rod allows the scraping element to slide back and forth, and the use of a steel scraping strip ensures both wear resistance and excellent performance.

[0019] Preferably, the scraping strip is made of steel wire or steel wire rope. The preferred solution of the steel wire scraping strip has a simple and durable structure and good scraping effect.

[0020] Preferably, the scraping devices between the layers are connected via a gear set, a transmission belt and a power mechanism.

[0021] Preferably, the power mechanism is arranged outside the device housing.

[0022] A method for cleaning filter media of a flat bag dust collector is characterized in that it specifically includes the following steps: mechanically scraping the surface of the filter media by a mechanical cleaning actuator of a scraping device arranged on a support beam of the flat bag filter unit; performing pneumatic pulse shocking on the filter media by a pulse cleaning component arranged at a mounting port of the flat bag filter unit; and simultaneously implementing the above-mentioned mechanical scraping and pneumatic pulse shocking to achieve composite cleaning of the filter media surface.

[0023] Preferably, the scraping device includes a connecting rod spaced between the upper and lower support beams and a guide rod arranged at both ends of the flat bag filter unit, and the mechanical cleaning actuator moves back and forth relative to the guide rod to scrape the surface of the filter material.

[0024] The embodiment of the present invention adopts the above technical solution, which has the following advantages:

[0025] 1. In terms of structural layout, the machine adopts a layered and compartmented side-by-side design, which enables bag changing during operation and maintenance. This structure significantly improves operational continuity and efficiency.

[0026] 2. In terms of cleaning mode, by setting up an independent mechanical scraping device and a pneumatic pulse device, mechanical composite cleaning of the filter surface is achieved. This cleaning method has a good cleaning effect.

[0027] 3. In terms of mechanical cleaning, multiple independently driven scraping devices are set up, which can clean in batches and at different speeds according to the number of layers and dust accumulation, making it flexible and efficient. The setting of the auxiliary mechanism for shifting reduces the structural complexity and space occupation of the cleaning system.

[0028] 4. In terms of sealing and airtightness, the filter unit is fixedly installed to avoid leakage caused by movement and has high reliability.

[0029] 5. In terms of vibration, noise and energy consumption, this solution only has a small amount of sliding of the scraping device, a low range of motion, low noise and power consumption, and is green and environmentally friendly.

[0030] 6. In terms of manufacturing and maintenance costs, the structure is simple, easy to process and maintain, and the cost is low.

[0031] 7. It is matched with the existing dust collector technology, which is easy to transform and promote its application.

[0032] In general, this scheme has good comprehensive technical indicators and performance and is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 It is a structural diagram of the present invention;

[0035] Figure 2 This is another perspective of the present invention, in which the housing is partially hidden;

[0036] Figure 3 It is a structural schematic diagram of the flat bag filter unit and the scraping device of the present invention;

[0037] Figure 4 for Figure 3 A magnified view of the structure at point A;

[0038] Figure 5 This is a structural diagram of the mechanical dust cleaning actuator;

[0039] Figure 6 It is a structural diagram of the support beam, transmission wheel, transmission belt, and compression transmission wheel combination;

[0040] Figure 7 It is a structural diagram of the flat bag and bag cage frame;

[0041] Figure 8 This is a schematic diagram of the structure of the pulse cleaning component.

[0042] Figure markings: device shell 01, support frame 011, inlet 02, air outlet channel 03, pulse cleaning component 04, ash hopper 05, flat bag filter unit 10, flat bag 101, bag cage frame 102, support beam 12, scraping device 20, middle connecting rod 13, side connecting rod 131, mechanical cleaning actuator 15, guide rod 14, main part 151, screw thread 152, connecting rod 153, scraping strip 154, transmission wheel 16, transmission belt 17, compression transmission wheel 18. DETAILED DESCRIPTION

[0043] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0044] It should be noted that the terms "first," "second," "symmetrical," and "array" are used solely for descriptive and positional purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, limitations on features such as "first" and "symmetrical" may explicitly or implicitly include one or more of these features. Similarly, when features are not limited in quantity using words such as "two" or "three," it should be noted that these features also explicitly or implicitly include one or more of these features.

[0045] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] Embodiment 1:

[0047] like Figure 1-8 As shown, a side-insertion flat bag composite cleaning dust collector includes a device shell 01, a support frame 011 for supporting the device shell 01, an inlet 02 for introducing dust-laden gas provided at the top of one side of the device shell 01, an outlet channel 03 for discharging filtered gas provided at the top of the other side of the device shell 01, a plurality of flat bag filter units 10 provided inside the device shell 01, a pulse cleaning assembly 04 provided at the mounting port of each flat bag filter unit 10, and an ash hopper 05 provided below the flat bag filter unit 10; each flat bag filter unit 10 includes a flat bag 101 and a bag cage frame 102 for supporting the flat bag, and the structure is as shown in FIG. Figure 8 The installation opening (also the opening direction) of each flat bag filter unit 10 is toward the air outlet channel 03 side.

[0048] In order to achieve the replacement of the flat bag filter unit 10 without stopping the equipment during operation, the following improvements are made to its structure:

[0049] 1. A plurality of parallel, switchable and isolated installation compartments 11 are provided on one side of the installation opening of the flat bag filter unit 10, dividing it into a plurality of independent installation areas.

[0050] 2. Each installation compartment is equipped with a set of flat bag filter units and connected to the main air flow duct. Different installation compartments can be airtightly isolated during bag changes.

[0051] 3. A multi-position switching valve is installed on the main airway to switch the flow to the filter units in different installation compartments. When the filter unit in a single installation compartment is removed and replaced, the airflow can be switched to other filter units, and the equipment can remain online.

[0052] 4. Each installation compartment is also equipped with an independent auxiliary operation port, through which the filter unit can be disassembled and installed to achieve quick bag change.

[0053] Through the above structure and control measures, the equipment can achieve continuous filtering operation while the filter unit in a single installation chamber can be maintained offline and the bag body can be replaced, which is conducive to continuous production.

[0054] Typically, in locations with high flow rates, flat bag filter units 10 are arranged in multiple layers. Each layer of flat bags has a support beam 12 at the bottom, near the mouth and tail, to support the flat bag filter units 10. Furthermore, utilizing the structure and position of support beams 12, a scraping device 20 is installed on the support beams 12 to mechanically clean the filter media surface.

[0055] The scraping device 20 includes: a plurality of intermediate connecting rods 13 vertically arranged between the upper and lower support beams 12. More specifically, each intermediate connecting rod 13 is located midway between the leading and trailing ends of two adjacent flat bag filter units 10. Side connecting rods 131 are provided on the outer side surfaces of each group of outermost flat bag filter units 10. Thus, each flat bag filter unit 10 is provided with connecting rods spaced equally on both sides. The device also includes: a double-start threading system provided on the outer periphery of each intermediate connecting rod 13. The two threads of the double-start threading system have opposite rotation directions, but other parameters are identical. The threads can also be replaced by a fixed screw equipped with such double-start threads. Each side connecting rod 131 is provided with a single-start threading system. The single-start threading system has an opposite rotation direction to the threading system on the opposite side of the adjacent side connecting rod 131, but other parameters are identical. The same threading system can also be replaced by a fixed screw equipped with such single-start threads. The intermediate connecting rods 13 and the side connecting rods 131 differ only in the thread arrangement. In this way, the parts used for scraping dust on the same side of the filter bag surface can engage with the corresponding thread lines. The rotation of the threads of different rotation directions in the same direction can ensure the synchronous lifting and lowering of the scraping parts on both sides. This synchronization is especially important when combined with pulse cleaning.

[0056] Reference Figure 5The scraping device 20 also includes a mechanical cleaning actuator 15, which includes a guide rod 14 on both sides of the head and tail ends of each flat bag filter unit 101; the two main parts 151 are movably mounted on the two guide rods 14 on the same side of the same flat bag filter unit 10; the same side of the two main parts 151 has a screw thread 152 that is threadedly engaged with the connecting rod; the center of the two main parts 151 is connected to the two main parts 151 as a whole through a connecting rod 153; a scraping strip 154 is provided on the side opposite to the screw thread 152, and the scraping strip 154 is in a certain crimping state relative to the surface of the filter material; the scraping strip 154 can be made of steel wire or steel wire rope stretched, and the scraping strip is made of steel wire, which makes it wear-resistant and has a good scraping effect and takes up very little space.

[0057] The above structure realizes that each flat bag filter unit has two main parts that can slide back and forth along the guide rod at both ends. After the two parts are connected, the filter material surface can be fully scraped and cleaned when sliding back and forth.

[0058] Each threaded connecting rod or fixed screw with a sleeve thread passes through the support beam 12 and is fixedly connected to the transmission wheel 16 at the same height after passing through the support beam 12. Each transmission wheel 16 is connected by a transmission belt 17, and then the power source is set to the outside of the device housing 01 through a bevel gear set and a transmission shaft, realizing the independent transmission of the scraping device between layers. The purpose of this arrangement is that after the dust-laden gas enters from the inlet 02, dust particles of different particle sizes and weights tend to be at different heights in the airflow. That is, most of the small particles float in the upper layer and are filtered by the filter units in the upper layer, while the large particles are in the relatively middle and lower layers and are filtered by the filter units in the corresponding layers. Small particles of dust are more likely to adhere to the filter bags. Therefore, the frequency of cleaning the filter units in the upper layer is generally higher than that in the lower layer.

[0059] In addition, a compression transmission wheel 18 is provided between two adjacent transmission wheels 16 to tighten the transmission belt 17 into the wheel groove. This can increase the contact area of the transmission belt and the wheel, improve the friction of the drive, ensure reliable and effective power transmission, and avoid pulley slippage.

[0060] The working process of the side-insertion flat bag composite cleaning dust collector is as follows:

[0061] 1. The dust-laden gas enters the device housing 01 from the inlet 02 and passes through the flat bags 101 of the multi-layer flat bag filter unit 10 in sequence, where the dust particles are trapped.

[0062] 2. The filtered clean gas is discharged from the bag cage frame 102 of the flat bag 101 and discharged out of the device along the gas outlet channel 03.

[0063] 3. Dust gradually accumulates on the surface of the filter media in the flat bag filter unit 10. The mechanical cleaning actuator 15 in the scraping device 20 mounted on the support beam 12, driven forward and reverse by an external power source, can scrape the filter media surface in all directions, implementing mechanical cleaning.

[0064] 4. At the same time, the installation port of each flat bag filter unit 10 is also provided with a pulse cleaning component 04, which can perform pneumatic pulse shock on the filter material to shake off the dust.

[0065] 5. While the pulse cleaning component 04 is working, the scraping device 20 mechanically scrapes the dust synchronously. In this way, combined with the pulse action, the flat bag filter unit 10 achieves composite cleaning of the filter material surface.

[0066] 6. The device adopts a layered and compartmented design, and the flat bag filter unit 10 can be replaced during operation, realizing the continuity of the cleaning and replacement process.

[0067] The scraping device can scrape the filter material surface in all directions through the above structure, and realize mechanical composite cleaning of the filter material surface together with the pulse device.

[0068] In order to reduce the filtering space occupied by the scraping device, a transposition auxiliary mechanism can be provided to enable a set of mechanical cleaning actuators 15 to serve the sides of two adjacent flat bag filter units 10.

[0069] The transposition auxiliary mechanism can be provided at both ends of the mechanical cleaning actuator 15, and includes:

[0070] 1) A pair of inclined panels are fixedly mounted at both ends of the mechanical cleaning actuator 15, and the two pairs of inclined panels are inclined in opposite directions;

[0071] 2) Guide ramps are symmetrically fixedly mounted on the frame between two adjacent flat bag filter units 10 on both sides of the corresponding ramp panels, and the inclination direction of the guide ramps is the same as that of the corresponding ramp panels;

[0072] 3) A pneumatic propulsion cylinder is provided in the space between the inclined plate and the guide inclined plate, and the end of the push rod of the propulsion cylinder is provided with a support wheel;

[0073] 4) When the mechanical cleaning actuator 15 slides to the gap position where the inclined plate and the guide inclined plate match, the inclined surfaces of the inclined plate and the guide inclined plate produce a mutually guiding effect, driving the cleaning actuator to flip direction; at the same time, the propulsion cylinder is quickly pushed out, pressing the support wheel against the actuator to fix it in the working position on the side of the adjacent filter unit.

[0074] By repeating this back-and-forth movement and reversing, one set of dust cleaning devices can serve two filter units, which not only reduces the space occupied by the mechanical structure but also reduces costs.

[0075] Example 2:

[0076] On the basis of the scraping actuator of the above device, an electric actuator can be provided to achieve more controllable and automated mechanical dust cleaning.

[0077] Specifically: the original gear-driven scraping mechanism is removed and replaced with a motor installed and fixed on a support beam or frame, with the motor output shaft connected to a screw transmission mechanism; the screw transmission drives the cleaning actuator to move back and forth on the guide rod to achieve scraping.

[0078] The advantages of this electric execution are:

[0079] The movement is more accurate and controllable, and parameters such as scraping frequency and strength can be programmed.

[0080] The power source is directly installed on the frame without the need for additional bearing support, making the structure simpler and more reliable.

[0081] The scraping parameters can be automatically adjusted according to the changes in the degree of dirt on the filter material to achieve intelligent control.

[0082] It is beneficial to cooperate with other actuators and detection devices to form an automation system.

[0083] By adding these two additional embodiments, the performance parameters of the composite dust removal device can be further enhanced.

[0084] Example 3:

[0085] Based on the composite dust removal device, an automatic online detection and early warning system can be set up to monitor the operating status of the filter bags online and realize the automatic early warning function of filter bag damage.

[0086] The specific method is:

[0087] 1) Install micro differential pressure sensors at the inlet and outlet of the filter bag to detect the pressure difference on both sides of the filter bag;

[0088] 2) Set up a weight sensor on the dust collecting bin to monitor the weight of dust trapped by the filter material;

[0089] 3) Set up an air flow meter to detect the flow rate of air passing through the filter bag;

[0090] 4) Collect sensor signals through PLC or industrial computer, and set logic to judge the filtering and damage conditions of filter bags;

[0091] 5) When the signal exceeds the preset threshold, visual and sound alarms are implemented through lighting alarm devices, sound and light alarms, etc.;

[0092] 6) Simultaneously send control instructions to switch or close the filter bag to prevent leakage of unfiltered gas.

[0093] The advantages of this automatic online monitoring system are:

[0094] 1) Monitor the operating status of the filter bag in real time and keep track of the performance of the filter bag;

[0095] 2) Predict the remaining service life of the filter material and formulate a reasonable replacement plan;

[0096] 3) Automatic alarm and switch when filter bag is damaged to prevent secondary pollution;

[0097] 4) The intelligent and unattended operation of the filter bag is realized.

[0098] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A side-insertion flat bag composite cleaning dust collector, comprising a device housing (01), a support frame (011), an inlet (02), an air outlet channel (03), a plurality of flat bag filter units (10), a pulse cleaning assembly (04) and an ash hopper (05), characterized in that: Support beams (12) are provided at the bottoms of the plurality of filter units, and dust scraping devices (20) are provided on the support beams (12) between adjacent layers. The dust scraping devices (20) comprise: A vertical middle connecting rod (13) is arranged on the supporting beam (12) and is provided with double threads with opposite rotation directions; A side connecting rod (131) is provided with a single thread and the thread direction is opposite to the thread direction of the adjacent middle connecting rod (13) on the opposite side; A mechanical dust cleaning actuator (15); the mechanical dust cleaning actuator (15) comprises a guide rod (14) provided on both sides of the front and rear ends of each flat bag filter unit (10), two main parts (151) movably sleeved on the guide rod (14), a screw thread (152) provided on the same side of the main part (151) and engaged with the connecting rod thread, a connecting rod (153) connecting the two main parts (151) and a dust scraping strip (154) on the side opposite to the screw thread (152); through the opposite rotation direction cooperation of the double-thread thread and the single-thread thread, the guide rod (14) guides the mechanical dust cleaning actuator (15) to move precisely in the compact space of the side-inserted flat bag, so as to achieve all-round mechanical composite cleaning of the filter material surface, improve the dust cleaning efficiency and extend the service life of the filter material.

2. The side-insertion flat bag composite cleaning dust collector according to claim 1 is characterized in that : The multiple filter units (10) are arranged in multiple layers.

3. The side-insertion flat bag composite cleaning dust collector according to claim 1 is characterized in that: A plurality of independent installation compartments (11) are provided in the device housing (01) on one side of the plurality of flat bag filter units (10), so as to realize replacement of the filter units without stopping the machine.

4. The side-insertion flat bag composite cleaning dust collector according to claim 3 is characterized in that An auxiliary operation port is provided on the device housing in the installation chamber (11) for disassembling and installing the flat bag filter unit (10).

5. The side-insertion flat bag composite cleaning dust collector according to claim 1 is characterized in that The scraping strip (154) is made of steel wire or steel rope.

6. The side-insertion flat bag composite cleaning dust collector according to claim 2 is characterized in that The scraping devices between the layers are connected through a gear set, a transmission belt and a power mechanism.

7. The side-insertion flat bag composite cleaning dust collector according to claim 6 is characterized in that :The power mechanism is arranged outside the device housing.

8. A method for cleaning filter material using the side-insertion flat bag composite cleaning dust collector according to claim 1, characterized in that , specifically comprising the following steps: (1) mechanically scraping the filter material surface by means of a mechanical cleaning actuator (15) of a scraping device (20) disposed on a support beam (12) of a flat bag filter unit (10); (2) performing pneumatic pulse shocking on the filter material by means of a pulse cleaning assembly (04) disposed at a mounting port of the flat bag filter unit (10); and (3) synchronously implementing the mechanical scraping and pneumatic pulse shocking to achieve composite cleaning of the filter material surface.

9. The dust cleaning method according to claim 8, characterized in that The scraping device comprises a connecting rod spaced between upper and lower support beams (12) and a guide rod (14) provided at both ends of the flat bag filter unit; the mechanical cleaning actuator (15) moves back and forth relative to the guide rod (14) to scrape the filter material surface.

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