Environment-friendly dust removal equipment for building engineering construction

Abstract

The invention relates to the technical field of dust removal, and discloses environment-friendly dust removal equipment for building engineering construction. A partition plate is fixedly arranged in the case and divides an inner cavity of the case into a purified gas cavity and a dusty gas cavity, at least one through hole is formed in the partition plate, the purified gas cavity is communicated with a gas outlet pipe, the dusty gas cavity is communicated with a gas inlet pipe, and the through holes are correspondingly provided with a filter cartridge, a shielding ring and a pulse pipe; the closing of the shielding ring enables the dust cleaning process to be carried out in a relatively closed dust air cavity environment. The positive pressure formed by the pulse airflow in the filter cartridge interacts with the external space limited by the shielding ring, so that shock waves can be efficiently conducted in the material of the filter cartridge, more sufficient and uniform radial shaking and deformation can be generated, a dust layer attached to the surface of the filter cartridge can be completely stripped and fall, the single-time dust cleaning effect is remarkably improved, and the service life of the filter cartridge is prolonged. And the ash removal frequency and the energy consumption are reduced.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology, specifically to an environmentally friendly dust removal device for construction engineering. Background Technology

[0002] In construction engineering, high-concentration dust generated during processes such as cutting and grinding poses a serious threat to the working environment and personnel health. Therefore, equipping construction sites with efficient dust removal equipment has become a necessary measure for pollution control. Among various dust removal technologies, physical dust removal methods based on cartridge filtration are widely used due to their high filtration efficiency and wide adaptability. The reliability of the cleaning process directly determines the long-term operational efficiency and emission stability of the equipment. Currently, pulse-jet cleaning is the mainstream cleaning method for this type of equipment. Its principle is to inject high-pressure airflow instantaneously into the filter cartridge, causing the filter cartridge wall to vibrate at high frequency, thereby peeling off the dust layer adhering to the surface. However, in practical applications, existing pulse-jet structures often fail to achieve uniform and concentrated airflow coverage within the filter cartridge, resulting in some high-pressure gas not fully acting on the filter cartridge wall before escaping in large quantities from the top or side gaps of the filter cartridge. This ineffective overflow not only directly weakens the effective back-blowing force acting on the filter cartridge, leading to insufficient cleaning intensity and incomplete dust removal, but also causes a serious waste of compressed air, increasing system operating energy consumption. Summary of the Invention

[0003] The main objective of this invention is to provide an environmentally friendly dust removal device for construction engineering, in order to solve the problem that in the existing technology, a large amount of gas overflows when the pulse airflow impacts the filter cartridge, which directly leads to poor backflushing effect.

[0004] To achieve the above objectives, the present invention provides an environmentally friendly dust removal device for construction engineering, comprising a chassis; A partition is fixed inside the chassis, which divides the inner cavity of the chassis into a clean air chamber and a dust air chamber. At least one perforation is provided on the partition. An air outlet pipe is connected to the clean air chamber, and an air inlet pipe is connected to the dust air chamber. A filter cartridge, a shielding ring and a pulse tube are respectively installed in the perforation. The filter cartridge is installed at the perforation and located inside the dust chamber, and the inner cavity of the filter cartridge is connected to the clean air chamber. The outlet end of the pulse tube passes through the perforation and is inserted into the inner cavity of the filter cartridge along the axial direction; The shielding ring is slidably fitted onto the pulse tube and located on the partition plate. The shielding ring slides along the pulse tube via a cleaning drive assembly to shield or open the perforation.

[0005] Preferably, the environmental protection dust removal equipment for construction engineering also includes a pulse generator and a connecting pipe. The pulse generator is fixed to the outer wall of the chassis, one end of the connecting pipe is connected to the pulse generator, and the other end passes through the clean air chamber and is connected to the air inlet of the pulse pipe.

[0006] Preferably, the filter cartridge includes an upper end cover, a lower end cover, a support mesh cylinder, and a filter media cylinder set on the support mesh cylinder, wherein the two ends of the support mesh cylinder are detachably connected to the upper end cover and the lower end cover, respectively. The upper cover and the partition are detachably connected, and a positioning ring is coaxially fixed on the inner wall of the upper cover. When the filter cartridge is installed in place, the positioning ring is located directly below the perforation.

[0007] Preferably, the cleaning drive assembly includes a slide tube, a sealing disc, a dispensing shell, a support ring, and an elastic element; One end of the slide tube is slidably inserted into the air outlet end of the pulse tube, the sealing plate is fixed to the other end of the slide tube, and an air pressure hole is opened on the tube wall of the slide tube. The bottom end of the distribution shell is rotatably connected to the lower end cover of the filter cartridge. A guide pipe is fixed on the top wall of the distribution shell. The guide pipe is located inside the distribution shell and can communicate with the inner cavity of the distribution shell. One end of the sliding tube with an air pressure hole can be inserted into the guide pipe, and the inner cavity of the sliding tube can communicate with the inner cavity of the distribution shell through the air pressure hole. The inner wall of the guide pipe can cover the air pressure hole. At least two air holes are opened on the circumferential side wall of the distribution shell. The support ring is fixedly sleeved on the slide tube and located between the pulse tube and the distribution shell. At least two radially extending extension rods are fixedly provided on the support ring, and the end of the extension rod away from the support ring is fixedly connected to the shielding ring. The elastic element is sleeved on the pulse tube, and its two ends abut against the shielding ring and the positioning ring respectively, so as to provide the shielding ring with an elastic force that tends to shield the perforation.

[0008] Preferably, the cleaning drive assembly further includes a bearing and a receiving rod; The outer ring of the bearing is fixedly connected to the lower end cover of the filter cartridge, and the inner ring is fixedly coaxially with the receiving rod; The end of the receiving rod furthest from the bearing is coaxially connected to the distribution housing.

[0009] Preferably, at least two horizontal tubes are fixed on the distribution shell, each horizontal tube corresponds to and is connected to an air hole, and the end of each horizontal tube away from the air hole is connected to a longitudinal tube, which is arranged in the support mesh cylinder along the axial direction of the filter cylinder. Each longitudinal tube is connected to multiple arc-shaped tubes along its axial direction, and the end away from the horizontal tube is blocked; The air outlet of each arc-shaped tube faces the inner wall of the supporting mesh cylinder.

[0010] Preferably, the tube wall portion of the slide tube with the air pressure hole is further provided with an annular groove, and the bottom of the annular groove is provided with a receiving hole that communicates with the inner cavity of the slide tube. The cleaning drive assembly also includes an airbag and an inflation tube. The airbag is disposed in an annular groove, one end of the inflation tube is connected to the airbag, and the other end passes through a receiving hole and extends into the inner cavity of the pulse tube. The airbag is configured to inflate and seal against the inner wall of the air tube when inflated.

[0011] Preferably, the elastic element is a compression spring, which is sleeved on the pulse tube and its two ends abut against the shielding ring and the positioning ring, respectively.

[0012] Preferably, the environmental protection dust removal equipment for construction projects also includes a support frame, which is fixedly connected to the chassis.

[0013] The beneficial effects of the above scheme are: During pulse-jet cleaning, either instantaneously or within a cleaning cycle, the drive assembly moves the shielding ring towards the partition, ensuring it fits snugly against the partition and physically sealing the gaps around the filter cartridge mounting holes. The closure of the shielding ring allows the cleaning process to occur within a relatively enclosed dust-filled chamber. The interaction between the positive pressure generated inside the filter cartridge by the pulsed airflow and the space defined by the shielding ring facilitates efficient transmission of the shock wave within the filter cartridge material, resulting in more complete and uniform radial vibration and deformation. This promotes more complete peeling and shedding of the dust layer adhering to the filter cartridge surface, significantly improving the cleaning effect per cycle and reducing cleaning frequency and energy consumption. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective; Figure 3 This is a schematic diagram of the first cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the second cross-sectional view of the present invention; Figure 5 yes Figure 4 Enlarged structural diagram of region A in the middle; Figure 6 yes Figure 5 A magnified structural diagram of region B in the middle; Figure 7 yes Figure 6 A magnified structural diagram of region C in the middle; Figure 8 This is a partial three-dimensional structural schematic diagram of the present invention.

[0016] Explanation of reference numerals in the attached figures 1. Chassis; 11. Partition; 111. Perforation; 12. Clean air chamber; 121. Air outlet pipe; 13. Dust air chamber; 131. Air inlet pipe; 2. Filter cartridge; 21. Upper end cover; 211. Positioning ring; 22. Lower end cover; 23. Support mesh cylinder; 24. Filter media cylinder; 3. Shielding ring; 4. Pulse tube; 5. Cleaning drive assembly; 51. Slide tube; 511. Air pressure hole; 512. Annular groove; 52. Sealing disc; 53. Distribution shell; 531. Air guide tube; 532. Air hole; 533. Horizontal tube; 534. Longitudinal tube; 535. Arc tube; 54. Support ring; 541. Extension rod; 55. Elastic element; 56. Bearing; 57. Receiving rod; 58. Airbag; 6. Pulse generator; 7. Connecting pipe; 8. Bracket. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Example

[0018] like Figures 1 to 8 As shown in the figure, this embodiment provides an environmentally friendly dust removal device for construction engineering, which includes a chassis 1, a partition 11, a filter cartridge 2, a shielding ring 3, a pulse tube 4, a cleaning drive assembly 5, a pulse generator 6, a connecting pipe 7, and a support 8.

[0019] Chassis 1 is fixed and supported by bracket 8. Please refer to... Figure 4 , Figure 5 As shown, a partition 11 is fixed inside the chassis 1, which horizontally divides the inner cavity of the chassis 1 into upper and lower parts: a clean air chamber 12 located at the top and a dust air chamber 13 located at the bottom. Please refer to... Figure 4 At least one perforation 111 is provided on the partition 11 for installing the filter cartridge 2. An air outlet pipe 121 is connected to the top or side wall of the clean air chamber 12, and the air outlet pipe 121 is connected to a prior art negative pressure fan (not shown) to create negative pressure inside the clean air chamber 12. An air inlet pipe 131 is connected to the side wall or bottom of the dust chamber 13 for introducing dust-laden gas generated during construction, or a dust collection hood is fixedly installed at the inlet end of the air inlet pipe for convenient collection of dust-laden gas.

[0020] Each perforation 111 corresponds to a filtration and cleaning unit. The filter cartridge 2 is installed at the perforation 111 and located within the dust chamber 13. Specifically, the filter cartridge 2 includes an upper end cover 21, a lower end cover 22, a support mesh cylinder 23, and a filter material cylinder 24 sleeved on the outside of the support mesh cylinder 23. The support mesh cylinder 23 is a porous metal filter structure that provides support for the filter material cylinder 24. Its upper and lower ends are detachably connected to the upper end cover 21 and the lower end cover 22 respectively (e.g., via threads or snaps). The upper end cover 21 is detachably connected to the partition plate 11 by bolts or other means to achieve a sealed fixation. The inner cavity of the filter cartridge 2 communicates with the upper perforation 111 and the clean air chamber 12 through the opening in the center of the upper end cover 21. A positioning ring 211 is also coaxially fixed on the inner wall of the upper end cover 21. When the filter cartridge 2 is installed in place, the positioning ring 211 is exactly below the perforation 111. The pulse tube 4 is used to guide the high-pressure pulsed gas. Its air inlet is located in the clean air chamber 12, and its air outlet passes through the perforation 111 on the partition 11 and is inserted downward along the axis of the filter cartridge 2 into the center of the inner cavity of the filter cartridge 2.

[0021] Please refer to Figure 4 , Figure 5 As shown, the shielding ring 3 is slidably fitted onto the pulse tube 4 and located on the partition 11. Under normal conditions (filtration state), the shielding ring 3 maintains a certain gap with the partition 11 under the action of the cleaning drive assembly 5, allowing airflow to pass through. At the moment of dust removal, the cleaning drive assembly 5 drives the shielding ring 3 to slide downward along the pulse tube 4 until it is tightly fitted against the upper surface of the partition 11, thereby physically shielding the gap around the perforation 111 and forming a dynamic seal.

[0022] The cleaning drive assembly 5 is used to drive the sliding of the shielding ring 3 and optimize the distribution of pulsed airflow. It mainly consists of a slide tube 51, a sealing disc 52, a distribution shell 53, a support ring 54, an elastic element 55, a bearing 56, a receiving rod 57, an airbag 58, and an inflation tube.

[0023] Please refer to Figure 6 , Figure 7 As shown, the upper end of the slide tube 51 is slidably inserted into the air outlet end of the pulse tube 4 and can move axially. A sealing disc 52 is fixedly installed at the lower end of the slide tube 51. An air pressure hole 511 is formed on the wall of the slide tube 51, and an annular groove 512 is also formed at the location of the air pressure hole 511. A receiving hole (not separately labeled in the figure) is formed at the bottom of the annular groove 512 and communicates with the inner cavity of the slide tube 51. An airbag 58 is disposed within the annular groove 512. One end of the inflation tube communicates with the airbag 58, and the other end extends through the receiving hole into the inner cavity of the pulse tube 4. When the airbag 58 is inflated, it expands and contacts the inner wall of the air guide tube 531 to form a seal.

[0024] like Figure 5As shown, the distribution shell 53 has a columnar shell structure and is located at the bottom of the filter cartridge 2. It is rotatably connected to the lower end cover 22 of the filter cartridge 2 via a bearing 56 and a receiving rod 57. Specifically, one end of the receiving rod 57 is fixed to the inner ring of the bearing 56, and the other end is coaxially fixed to the distribution shell 53, while the outer ring of the bearing 56 is fixed to the lower end cover 22, allowing the distribution shell 53 to rotate freely relative to the filter cartridge 2. An air guide tube 531 is fixed to the top wall of the distribution shell 53, extending upwards. When the sliding tube 51 moves downwards, the section with the air pressure hole 511 can be inserted into the air guide tube 531. Multiple air holes 532 are formed on the circumferential sidewalls of the distribution shell 53. Furthermore, to distribute the airflow more evenly, the distribution shell 53 is also fixed with horizontal tubes 533 that correspond one-to-one with and communicate with the air holes 532. Each horizontal tube 533 is connected to a longitudinal tube 534 at its end. The longitudinal tube 534 is arranged along the axial direction of the filter cartridge 2 inside the support mesh cylinder 23. Each longitudinal tube 534 is connected along its axial direction to multiple arc-shaped tubes 535. The air outlet of the arc-shaped tubes 535 faces the inner wall of the support mesh cylinder 23.

[0025] Please refer to Figures 6-8 As shown, the support ring 54 is fixedly sleeved on the slide tube 51, located between the lower part of the pulse tube 4 and the upper part of the distribution shell 53. Two extension rods 541 are fixedly mounted on the support ring 54, and the distal ends of these extension rods 541 are fixedly connected to the inner side of the shielding ring 3. Therefore, the axial movement of the slide tube 51 can be synchronously transmitted to the shielding ring 3 through the support ring 54 and the extension rods 541. The elastic element 55 is a compression spring in this embodiment. It is sleeved on the pulse tube 4, and its two ends abut against the lower surface of the shielding ring 3 and the positioning ring, respectively, providing the shielding ring 3 with an elastic preload that is always upward and tends towards the shielding perforation 111. The pulse generator 6 is fixedly installed on the outer wall of the housing 1. One end of the connecting pipe 7 is connected to the outlet of the pulse generator 6, and the other end passes through the clean air chamber 12 and is connected to the air inlet of the pulse tube 4, for introducing the instantaneously generated high-pressure pulse airflow into the pulse tube 4.

[0026] Work process: Filtration status: Dust-laden gas generated during construction enters the dust chamber 13 through the inlet pipe 131. Under the negative pressure of the clean air chamber 12, the gas passes through the filter material cylinder 24 and enters the interior of the filter cylinder 2. Dust is trapped on the outer surface of the filter material cylinder 24. The purified gas enters the clean air chamber 12 through the perforation 111 and is finally discharged through the outlet pipe 121. At this time, the pulse generator 6 is turned off, and there is no high-pressure airflow. Under the elastic force of the elastic element 55, the shielding ring 3 is pushed upward, maintaining a gap with the partition 11, allowing the filtered gas to pass smoothly through the perforation 111. At the same time, the slide pipe 51 is in a relatively high position under the indirect action of the elastic element 55, and the air pressure hole 511 on it is located inside the annular wall of the air guide pipe 531 and is shielded. The air bag 58 is not inflated.

[0027] Dust removal process: When dust accumulates on the surface of filter cartridge 2 to a certain extent and requires dust removal, the pulse generator 6 is activated instantly. High-pressure pulsed gas is injected downwards through connecting pipe 7 and pulse pipe 4. In the initial stage, the high-pressure gas impacts the sealing disc 52 and pushes the slide tube 51 downwards against the elastic force of the elastic element 55. The downward movement of the slide tube 51 drives the shielding ring 3 to move downwards synchronously through the support ring 54 and extension rod 541 until the shielding ring 3 is tightly fitted against the upper surface of the partition plate 11, completely sealing the gaps around the perforation 111. This process blocks the path for dust to escape from the gaps during dust removal.

[0028] Airflow distribution and dust removal: After the sliding tube 51 moves into position, the air pressure hole 511 on it moves down to a position that communicates with the inner cavity of the distribution shell 53. At the same time, the air bag 58 is inflated and sealed with the inner wall of the air guide tube 531, forcing the subsequent pulse airflow to enter the distribution shell 53 mainly through the air pressure hole 511. After the high-pressure airflow enters the distribution shell 53, it is distributed to the longitudinal tubes 534 through the air holes 532 and the horizontal tubes 533, and then ejected from the outlets of the multiple arc-shaped tubes 535 on the longitudinal tubes 534. These outlets directly face the inner wall of the supporting mesh cylinder 23, so that the high-pressure airflow can act on the entire height and circumference of the filter cartridge 2 (filter material cylinder 24) in a concentrated and uniform manner, inducing the filter cartridge 2 to produce efficient and comprehensive radial vibration and deformation. At the same time, the distribution shell 53 may rotate under the reaction force, further enhancing the uniformity of airflow distribution.

[0029] Filtration Restoration: After the pulse jet cleaning ends, the pulse generator 6 shuts off, and the air bladder 58 deflates. Under the restoring force of the elastic element 55, the shielding ring 3 is pushed back to its initial position separated from the partition 11, reopening the gas passage. The slide tube 51 also resets, and the pressure port 511 is once again shielded by the inner wall of the air guide tube 531. The dislodged dust falls into the bottom of the dust chamber 13, and the equipment returns to normal filtration status.

[0030] In traditional pulse cleaning, the high-pressure reverse airflow can easily carry dust particles dislodged during the cleaning process, entering the clean air chamber 12 through the gap between the upper cover 21 of the filter cartridge 2 and the mounting plate, causing instantaneous emissions to exceed standards. When the cleaning command is triggered, the cleaning drive assembly 5 first drives the shielding ring 3 downwards to tightly adhere to the partition 11, physically sealing the gaps around the perforation 111. This dynamic sealing mechanism completely isolates the dust chamber 13 from the clean air chamber 12 during the critical cleaning phase, fundamentally cutting off the path for dust to rise short-circuit with the airflow. As a result, even during frequent cleaning cycles, the equipment can maintain a consistently low outlet emission concentration, meeting increasingly stringent environmental standards for construction sites and significantly improving the quality of the working environment.

[0031] Traditional blowpipes suffer from uneven airflow distribution and are prone to overflowing from the top opening, resulting in insufficient dust removal. This design, through the linkage of the sliding pipe 51, the distribution shell 53, the longitudinal pipe 534, and the arc-shaped pipe 535, guides and confines the pulsed airflow within the effective space inside the filter cartridge 2.

[0032] After the shielding ring 3 is closed, a relatively closed chamber is formed in the upper part of the filter cartridge 2. The pulsed airflow cannot be effectively released from here, forcing the airflow to penetrate downwards more fully and act on the wall of the filter cartridge 2.

[0033] The high-pressure airflow is split from multiple air holes 532 through the distribution shell 53 and enters the longitudinal pipe 534 arranged along the axial direction of the filter cartridge 2. Then it is ejected through multiple arc-shaped nozzles 535 facing the inner wall of the filter cartridge 2. This design achieves three-dimensional and uniform coverage of the high-pressure airflow throughout the entire height and circumference of the filter cartridge 2, inducing the filter cartridge 2 to produce more comprehensive and intense radial vibration and deformation, so that the dust layer adhering to the surface is peeled off in sheets and completely.

[0034] The distribution shell 53 is designed to rotate freely via the bearing 56. It may rotate under the reaction force of the airflow, which further promotes the uniformity of the airflow in contact with the inner wall of the filter cartridge 2 and avoids the "dead angle" that may be generated by fixed spraying.

[0035] Under the combined effect, the efficiency of single dust removal is greatly improved, the dust removal cycle is extended, thereby significantly reducing the total consumption of compressed air and achieving high-efficiency and energy-saving operation.

[0036] The dust removal action of this device, which involves sealing the shielding ring 3 and distributing airflow, does not rely on an additional independent control system. Instead, the pulsed airflow itself serves as the power source, achieving intelligent linkage through a mechanical structure. When the pulse valve opens, the airflow automatically pushes the slide tube 51 and drives the shielding ring 3 to complete the sealing, while simultaneously opening the distribution channel. After the blowing ends, the elastic element 55 automatically resets all components. This integrated pneumatic and mechanical design offers rapid response, high reliability, and eliminates the need for complex electrical control programs or sensors, thus reducing system complexity, failure rate, and maintenance costs.

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. An environmentally friendly dust removal device for construction engineering, characterized in that, Includes a chassis (1); A partition (11) is fixedly installed inside the chassis (1). The partition (11) divides the inner cavity of the chassis (1) into a clean air chamber (12) and a dust air chamber (13). At least one perforation (111) is provided on the partition (11). The clean air chamber (12) is connected to an air outlet pipe (121), and the dust air chamber (13) is connected to an air inlet pipe (131). A filter cartridge (2), a shielding ring (3), and a pulse tube (4) are correspondingly provided in the perforation (111). The filter cartridge (2) is installed at the perforation (111) and located in the dust chamber (13), and the inner cavity of the filter cartridge (2) is connected to the clean air chamber (12) through the perforation (111); The outlet end of the pulse tube (4) passes through the perforation (111) and is inserted into the inner cavity of the filter cartridge (2) along the axial direction of the filter cartridge (2); The shielding ring (3) is slidably sleeved on the pulse tube (4) and located on the partition (11). The shielding ring (3) slides along the pulse tube (4) through a cleaning drive assembly (5) to shield or open the perforation (111).

2. The environmental protection dust removal equipment for construction engineering as described in claim 1, characterized in that, It also includes a pulse generator (6) and a connecting pipe (7). The pulse generator (6) is fixed to the outer wall of the chassis (1). One end of the connecting pipe (7) is connected to the pulse generator (6), and the other end passes through the clean air chamber (12) and is connected to the air inlet of the pulse pipe (4).

3. The environmental protection dust removal equipment for construction engineering as described in claim 1, characterized in that, The filter cartridge (2) includes an upper end cap (21), a lower end cap (22), a support mesh cylinder (23), and a filter material cylinder (24) fitted on the support mesh cylinder (23). The two ends of the support mesh cylinder (23) are detachably connected to the upper end cap (21) and the lower end cap (22), respectively. The upper cover (21) is detachably connected to the partition (11), and a positioning ring (211) is coaxially fixed on the inner wall of the upper cover (21). When the filter cartridge (2) is installed in place, the positioning ring (211) is located directly below the perforation (111).

4. The environmental protection dust removal equipment for construction engineering according to claim 3, characterized in that, The cleaning drive assembly (5) includes a slide tube (51), a sealing disc (52), a distribution shell (53), a support ring (54), and an elastic element (55). One end of the slide tube (51) is slidably inserted into the air outlet of the pulse tube (4), the sealing disc (52) is fixed to the other end of the slide tube (51), and an air pressure hole (511) is opened on the tube wall of the slide tube (51). The bottom end of the distribution shell (53) is rotatably connected to the lower end cap (22) of the filter cartridge (2). A gas guide tube (531) is fixedly provided on the top wall of the distribution shell (53). One end of the gas guide tube (531) is located inside the distribution shell (53) and can communicate with the inner cavity of the distribution shell (53), and the other end extends out of the distribution shell (53). One end of the sliding tube (51) with the air pressure hole (511) can be inserted into the gas guide tube (531), and the inner cavity of the sliding tube (51) can communicate with the inner cavity of the distribution shell (53) through the air pressure hole (511). The inner wall of the gas guide tube (531) can cover the air pressure hole (511). At least two air holes (532) are opened on the circumferential side wall of the distribution shell (53). The support ring (54) is fixedly sleeved on the slide tube (51) and located between the pulse tube (4) and the distribution shell (53). At least two radially extending extension rods (541) are fixedly provided on the circumference of the support ring (54). The end of the extension rod (541) away from the support ring (54) is fixedly connected to the shielding ring (3). The elastic element (55) is sleeved on the pulse tube (4), and its two ends abut against the shielding ring (3) and the positioning ring (211) respectively, so as to provide the shielding ring (3) with an elastic force that tends to shield the perforation (111).

5. The environmental protection dust removal equipment for construction engineering according to claim 4, characterized in that, The cleaning drive assembly (5) also includes a bearing (56) and a receiving rod (57). The outer ring of the bearing (56) is fixedly connected to the lower end cap (22) of the filter cartridge (2), and the inner ring is coaxially fixed with the receiving rod (57); The end of the receiving rod (57) away from the bearing (56) is coaxially connected to the distribution shell (53).

6. The environmental protection dust removal equipment for construction engineering according to claim 4, characterized in that, At least two horizontal tubes (533) are fixed on the distribution shell (53). The horizontal tubes (533) correspond one-to-one with the air holes (532) and are connected. Each horizontal tube (533) has a longitudinal tube (534) connected to one end away from the air hole (532). The longitudinal tube (534) is arranged in the support mesh cylinder (23) along the axial direction of the filter cylinder (2). Each of the longitudinal tubes (534) is connected to a plurality of arcuate tubes (535) along its axial direction, and the end away from the transverse tube (533) is blocked; The air outlet of each of the arc-shaped tubes (535) faces the inner wall of the supporting mesh cylinder (23).

7. The environmental protection dust removal equipment for construction engineering according to claim 4, characterized in that, The slide tube (51) is also provided with an annular groove (512), and the bottom of the annular groove (512) is provided with a receiving hole that communicates with the inner cavity of the slide tube (51). The cleaning drive assembly (5) also includes an airbag (58) and an inflation tube. The airbag (58) is disposed in the annular groove (512). One end of the inflation tube is connected to the airbag (58), and the other end passes through the receiving hole and extends into the inner cavity of the pulse tube (4). The airbag (58) is configured to expand in an inflated state and seal against the inner wall of the air duct (531).

8. The environmental protection dust removal equipment for construction engineering according to claim 4, characterized in that, The elastic element (55) is a compression spring, which is sleeved on the pulse tube (4) and its two ends abut against the shielding ring (3) and the positioning ring (211) respectively.

9. The environmental protection dust removal equipment for construction engineering according to claim 1, characterized in that, It also includes a bracket (8), which is fixedly connected to the chassis (1).

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