A centralized dust removal system for tracked mobile crushing and screening stations

Abstract

This invention relates to the field of dust removal technology, specifically a centralized dust removal system for a tracked mobile crushing and screening station; it includes an improved bag filter dust collector; the improved bag filter dust collector includes a housing, a second filter bag, and a collection hopper; the lower port of the housing is fixedly connected to the upper port of the collection hopper; the lower port of the collection hopper is sequentially connected to an ash discharge screw conveyor, an airlock fan, and a scraper conveyor; an air inlet flange is provided at the left end of the collection hopper; an air outlet flange is provided on the upper right side of the housing; the invention uses a baffle plate that periodically moves sequentially to directly below the partition groove, thereby stopping the air intake at the lower end of the second filter bag that needs to be cleaned, thus allowing impurities inside the second filter bag to be removed and cleaned. Because the impurities are intercepted inside the second filter bag, the cleaning process of a single second filter bag will not cause other second filter bags to be re-adhered to by impurities, improving the cleaning effect of the second filter bag, and thus indirectly improving the dust removal effect.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology, specifically a centralized dust removal system for tracked mobile crushing and screening stations. Background Technology

[0002] In recent years, with the construction of urban infrastructure and the development of large-scale mines, mobile crushing and screening equipment has become increasingly prominent. In the traditional mining industry, raw materials after blasting need to undergo processes such as coarse crushing, fine crushing, and screening. When crushing and screening equipment classifies stones into different sizes and types, it generates a large amount of dust, polluting the surrounding environment. Therefore, many people are concerned about the environmental impact of mobile crushing and screening stations, which are mostly used in open-air environments. Thus, how to solve the dust generated by crushing and screening equipment during operation has become a very challenging problem.

[0003] Currently, most mobile crushing and screening equipment in open-pit mines mainly adopt the following measures for dust control:

[0004] The first method is water spraying for dust suppression: a water spraying system is used during crushing and screening to reduce dust generation and dispersion. Water spraying is currently a common dust control measure in mines. Although it can reduce some dust, it requires a large amount of water resources, which is not feasible in water-scarce areas. Moreover, in some areas, the winter temperature is low and water is prone to freezing, making water spraying unsuitable for dust suppression.

[0005] The second method is to use a "closed conveyor belt": using a closed conveyor belt reduces dust emissions during material transportation. However, this method requires adding a dust cover to the conveyor belt. Although it can suppress dust during material transportation, the dust removal effect is not ideal. Setting a dust cover on the conveyor cannot achieve complete sealing, and the manufacturing cost is high. This method cannot be used to reduce dust when the wind is strong around the mine.

[0006] The third method is "wet crushing": Where possible, wet crushing is used to reduce dust generation. However, when using this method for dust removal, the processed material contains a large amount of moisture, requiring a dedicated area for drying to remove surface moisture. For some mixing plants with strict control over material moisture content, this method may not meet the requirements.

[0007] The fourth method is to equip the construction site with dust removal equipment: equip the site with high-efficiency dust removal equipment, such as bag filters or cyclone dust collectors, to collect and process dust; use dust collectors to remove dust, and install the dust collectors on the crushing and screening main units. Although this can solve some of the dust problem, it requires a lot of manpower and resources to maintain. When there are multiple crushing and screening units on a production line, multiple dust collectors are required. It is impossible to interlock the equipment. If one piece of equipment fails, the entire line cannot be shut down.

[0008] Most existing dust collectors are pulse-jet dust collectors. Dust enters the dust collector through the inlet with the airflow, passes through the inner side of the filter bags from the outside to the inside, and finally exits along the inner side of the filter bags. The dust is intercepted and filtered on the outer wall of the filter bags. During the dust removal process, if the filter bag filtration effect is detected as poor, the electromagnetic pulse valve will be triggered, causing the blowpipe to impact the inner side of the filter bags. The gas passes through the filter bags from the inside to the outside, causing the dust to be backflushed and detached. In order to ensure the continuous operation of the dust collector, the dust collector does not stop to backflush and clean the filter bags. In this process, the airflow of the filter bags being cleaned is from the inside to the outside, while the airflow of the filter bags being filtered is from the outside to the inside. Thus, the dust backflushed from the cleaned filter bags will be carried by the surrounding airflow and adhere to the outer wall of the filter bags being filtered, resulting in secondary adhesion. This causes the problem of poor filter bag cleaning effect in existing dust collectors and affects the dust removal effect. Summary of the Invention

[0009] To overcome the shortcomings of existing technologies, this invention proposes a centralized dust removal system for a tracked mobile crushing and screening station. This invention uses baffles that periodically move sequentially to the bottom of the partition, causing the lower end of the second filter bag to stop air intake. This allows impurities inside the second filter bag to be removed, achieving cleaning. Because impurities are intercepted inside the second filter bag, the cleaning process of a single second filter bag prevents other second filter bags from being re-adhered to by impurities, improving the cleaning effect of the second filter bags and indirectly improving the dust removal effect.

[0010] The technical solution adopted by this invention to solve its technical problem is as follows: A centralized dust removal system for a tracked mobile crushing and screening station, comprising an improved bag filter dust collector; the improved bag filter dust collector includes a housing, a second filter bag, and a collection hopper; the lower port of the housing is fixedly connected to the upper port of the collection hopper; the lower port of the collection hopper is sequentially connected to an ash discharge screw conveyor, an airlock fan, and a scraper conveyor; an air inlet flange is provided at the left end of the collection hopper; an air outlet flange is provided on the upper right side of the housing; a partition plate with a slit is fixedly connected to the lower part of the inner side of the housing; the upper end of the second filter bag is connected to the inner wall of the housing via a crossbar, and the lower end is fixedly connected to the slit; a frame is fitted on the outer side of the second filter bag; a screw is rotatably connected to the inner side of the housing and a sliding rod is fixedly connected; the screw is driven by a motor; the screw is threadedly connected to a baffle plate; the baffle plate is slidably connected to the sliding rod; the upper surface of the baffle plate contacts the lower surface of the partition plate and can block the slit.

[0011] Preferably, the outer wall of the screw is fitted with an elastic folding sleeve; one end of the elastic folding sleeve is fixedly connected to the baffle plate, and the other end is fixedly connected to the inner wall of the box.

[0012] Preferably, the shielding plate is provided with a one-way groove running through its upper and lower parts; the one-way groove aligns with the partition groove as the shielding plate moves; the inner wall of the one-way groove is rotatably connected to the one-way plate by a torsion spring; and a limiting block for limiting the one-way plate is fixedly connected to the upper part of the inner wall of the one-way groove.

[0013] Preferably, an electromagnet is installed inside the frame; the partition is made of magnetic material.

[0014] Preferably, the lower surface of the baffle plate is provided with two pairs of extension plates; the edges of the extension plates are adapted to the inner wall of the collection hopper; the extension plates are provided with ventilation holes running through them on the left and right sides; the two ventilation holes are connected by an elastic sleeve.

[0015] Preferably, the lower end of one of the extension plates is lower than the lower end of the other extension plate; the extension plates are elastic; a lever is fixedly connected to the lower position of the inner wall of the collecting hopper; the lower end of one of the extension plates is in contact with the lever.

[0016] Preferably, the inner front wall of the housing is vertically provided with a corrugated groove; a movable block is movably connected within the corrugated groove; and the movable block is fixedly connected to the front end of the frame.

[0017] Preferably, a vertical groove is provided on the rear inner wall of the box; a crossbar is slidably connected to the rear end of the crossbar; the upper surface of the crossbar is connected to the top wall of the box via a tension spring.

[0018] Preferably, the centralized dust collection system also includes a jaw crusher feeder spray pipe, a jaw crusher main unit centralized dust collection hood, a cone feeder hopper dust collection hood, a cone main unit centralized dust collection hood, a cone return screen dust collection hood, a screening feeder hopper dust collection hood, a screening main unit dust collection hood, and a screening finished product conveyor sealing cover. The dust collected during the crushing and screening process will be connected to the centralized dust collection pipe through the jaw crusher main unit dust collection pipe, the cone feeder hopper dust collection pipe, the cone main unit dust collection pipe, and the screening main unit dust collection pipe. The centralized dust collection pipe is connected to a centralized dust collector, which is an improved bag filter dust collector.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. This invention uses a baffle plate that periodically moves to the bottom of the trough, thereby stopping the air intake at the lower end of the second filter bag that needs to be cleaned. This allows the impurities inside the second filter bag to be removed, thus achieving cleaning. Because the impurities are trapped inside the second filter bag, the cleaning process of a single second filter bag will not cause other second filter bags to be re-adhered to by impurities, improving the cleaning effect of the second filter bag and indirectly improving the dust removal effect.

[0021] 2. The present invention provides a unidirectional flow channel on the baffle plate, which can block the airflow of the second cloth bag that is no longer in use, and also allow the impurities after cleaning to flow out of the second cloth bag in a timely manner, thus avoiding the blockage of the lower part of the second cloth bag.

[0022] 3. The two extension plates in this invention can separate the dust-laden gas in the collection hopper, thereby making the discharge of impurities in the one-way trough more stable. After the impurities enter the two extension plates, they will fall directly near the lower port of the collection hopper under the extension of the extension plates, so as to achieve smooth discharge of impurities. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a perspective view of the improved bag filter dust collector of the present invention;

[0025] Figure 2 yes Figure 1 A stereoscopic view from the right side;

[0026] Figure 3 yes Figure 1 A sectional view;

[0027] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0029] Figure 6 yes Figure 3 Enlarged view of point C in the middle;

[0030] Figure 7 This is a diagram showing the location of the corrugated grooves in this invention;

[0031] Figure 8 This is a diagram showing the location of the slide groove in this invention;

[0032] Figure 9 This is a perspective view of the second cloth bag in this invention;

[0033] Figure 10 This is a perspective view of the screw, slide bar, and baffle plate in this invention;

[0034] Figure 11 This is a schematic diagram of the structural composition of the dust removal system of the present invention;

[0035] Figure 12 This is a schematic diagram of the equipment involved in the dust removal system of this invention;

[0036] Figure 13 This is a dust removal process diagram of the present invention;

[0037] Figure 14 This is a structural diagram of the pulse bag filter in this invention.

[0038] In the diagram: 1. Excavator; 2. Jaw crusher; 21. Jaw crusher feeder spray pipe; 22. Jaw crusher main unit centralized dust collection hood; 23. Jaw crusher conveyor sealing cover; 24. Jaw crusher main unit dust collection pipe; 25. Jaw crusher finished product conveyor; 3. Cone crusher; 31. Cone hopper dust collection hood; 311. Cone hopper; 312. Cone conveyor; 32. Cone crusher main unit centralized dust collection hood; 34. Cone return screen dust collection hood; 34 1. Conical return screen; 35. Conical main unit dust collection pipe; 36. Conical feeding hopper dust collection pipe; 4. Screening main unit; 41. Screening feeding hopper dust collection hood; 42. Screening main unit dust collection hood; 43. Screening finished product conveyor sealing cover; 431. Screening finished product conveyor; 44. Screening finished product conveyor head dust collection hood; 45. Finished product conveyor head spray; 46. Screening main unit dust collection pipe; 47. Screening feeding hopper dust collection pipe; 5. Centralized dust collection 51. Exhaust pipe; 52. Centralized dust collector fan; 53. Centralized electrical control system; 54. Ash discharge screw conveyor; 55. Centralized dust collection pipe; 56. Dust collection pipe support; 57. First filter bag; 58. Pulse jet pipe; 581. Dust storage hopper; 59. Air compressor; 591. Air tank; 6. Housing; 61. Air outlet flange; 62. Partition plate; 621. Separator; 63. Screw; 631. Motor; 632. Flexible folding mechanism 64. Slide bar; 65. Corrugated groove; 66. Slide groove; 67. Bracket; 7. Second cloth bag; 71. Crossbar; 72. Squeegee frame; 721. Electromagnet; 73. Movable block; 74. Tension spring; 8. Collection hopper; 81. Air inlet flange; 82. Pulley; 9. Baffle plate; 91. One-way groove; 92. One-way plate; 921. Torsion spring; 922. Limiting block; 93. Extension plate; 931. Vent hole; 932. Elastic sleeve. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] like Figures 1 to 14 As shown, the present invention includes the following embodiments: Embodiment 1, as Figures 1-10As shown, a centralized dust removal system for a tracked mobile crushing and screening station includes an improved bag filter dust collector. The improved bag filter dust collector includes a housing 6, a second filter bag 7, and a collection hopper 8. The housing 6 is supported by a bracket 67. The lower port of the housing 6 is fixedly connected to the upper port of the collection hopper 8. The lower port of the collection hopper 8 is sequentially connected to a screw conveyor 54 for ash removal, a rotary valve (not shown in the figure), and a scraper conveyor (not shown in the figure). An air inlet flange 81 is provided at the left end of the collection hopper 8. An air outlet flange 61 is provided on the upper right side of the housing 6. The lower inner side of the housing 6... A partition plate 62 with a slot 621 is fixedly connected to the position; the upper end of the second cloth bag 7 is connected to the inner wall of the box body 6 via a crossbar 71, and the lower end is fixedly connected to the slot 621; a frame 72 is sleeved on the outer side of the second cloth bag 7; a screw 63 is rotatably connected to the inner side of the box body 6 and a slide rod 64 is fixedly connected; the screw 63 is driven by a motor 631; the screw 63 is threadedly connected to a baffle plate 9; the baffle plate 9 is slidably connected to the slide rod 64; the upper surface of the baffle plate 9 contacts the lower surface of the partition plate 62 and can block the slot 621.

[0041] The screw 63 is fitted with an elastic folding sleeve 632 on its outer wall; one end of the elastic folding sleeve 632 is fixedly connected to the baffle plate 9, and the other end is fixedly connected to the inner wall of the box 6.

[0042] Dust collected during the crushing and screening process enters the inlet flange 81 with the airflow. Dust-laden air then enters the collection hopper 8 along the inlet flange 81. The dust-laden gas flows upwards through the partition 621 into the inner side of the second filter bag 7. Dust and moisture are trapped inside the second filter bag 7. Clean air flows outwards through the second filter bag 7 and into its outer side. The clean air finally converges and exits along the outlet flange 61. An elastic folding sleeve 632 is fitted onto the screw 63 on the inner wall of the housing 6. This sleeve protects the screw 63 from dust and other impurities that could affect its rotation. The motor 631 will... During periodic rotation, the motor 631 drives the screw 63 to rotate, which in turn drives the baffle 9 to slide along the slide bar 64. This causes the baffle 9 to move in the left and right directions. The baffle 9 moves sequentially to the lower port of the corresponding partition 621 and blocks the corresponding partition 621. Each time the baffle 9 blocks the partition 621, it stays for a period of time. After the lower port of the partition 621 is blocked by the baffle 9, the dust-laden gas cannot pass through the partition 621 from bottom to top into the second filter bag 7. That is, the lower port of the second filter bag 7 is blocked, while the second filter bag 7 whose lower port is not blocked still maintains the filtration of dust-laden gas from the inside to the outside.

[0043] For ease of description, the second cloth bag 7 with its lower port not blocked is referred to as the activated second cloth bag 7, and the second cloth bag 7 with its lower port blocked is referred to as the deactivated second cloth bag 7. The clean gas flowing from the inside to the outside of the activated second cloth bag 7 will impact the outer wall of the deactivated second cloth bag 7, causing the deactivated second cloth bag 7 to deflate. The pressure on the outside of the deactivated second cloth bag 7 decreases under the airflow. When there is a pressure difference between the inside and outside of the deactivated second cloth bag 7, the gas inside the deactivated second cloth bag 7 will flow to the outside, allowing the deactivated second cloth bag 7 to deflate smoothly.

[0044] When no dust-laden gas enters the lower port of the deactivated second filter bag 7, the weight of the frame 72 is greater than the resistance, causing it to move downwards under its own weight. The inner cross-section of the frame 72 matches the cross-section of the deflated second filter bag 7. As the frame 72 moves downwards, it pushes the impurities on the inner wall of the deactivated second filter bag 7 downwards. The gas inside the deactivated second filter bag 7 is compressed and flows out from the inside. The impurities inside the deactivated second filter bag 7 are eventually pushed into the trough 621 and to the lower end of the deactivated second filter bag 7. The dust accumulates, facilitating subsequent removal. After the impurities inside the deactivated second filter bag 7 are removed, the cleaning of the inner side of the deactivated second filter bag 7 is achieved. Then, the motor 631 is controlled to drive... The screw 63 baffle 9 moves to the lower port of the next partition 621 and blocks the lower port of the lower partition 621. The baffle 9 is connected to the elastic folding sleeve 632, so the elastic folding sleeve 632 on the screw 63 will fold and unfold with the movement of the baffle 9. After the baffle 9 moves away from under the second unused cloth bag 7 after cleaning, the accumulated impurities inside the second unused cloth bag 7 will move down and fall. The accumulated impurities will pass through the partition 621 and fall into the collection hopper 8, and finally flow out along the lower port of the collection hopper 8. The lower port of the collection hopper 8 is connected to the ash discharge screw conveyor 54, the airlock fan and the scraper. The specific ash discharge principle and process are existing technologies and will not be described in detail here.

[0045] After the impurities accumulated in the lower inner part of the deactivated second filter bag 7 fall off, the deactivated second filter bag 7 will transform into the activated second filter bag 7. The dust-laden gas will re-enter the activated second filter bag 7 along the collection hopper 8. As the gas enters the activated second filter bag 7 from bottom to top, the activated second filter bag 7 will gradually expand and bulge. During the expansion process of the activated second filter bag 7 from bottom to top, it will push the frame 72 upward until the activated second filter bag 7 is fully expanded and bulging. The frame 72 will also move to a position close to the crossbar 71. Each activated second filter bag 7 will be deactivated, and deactivated second filter bags 7 will be activated again; this achieves the cleaning of all second filter bags 7 in the housing 6, ensuring the filtering effect of the second filter bags 7 on dusty gas; when the second filter bags 7 do not need to be cleaned, the baffle plate 9 will move to a position offset from the partition 621 to ensure that all partitions 621 are unobstructed; in this embodiment, the second filter bags 7 can be set to be detachable for easy replacement, specifically by using a snap-fit ​​structure, which is existing technology and will not be described in detail.

[0046] The present invention uses a baffle plate 9 to periodically move to the bottom of the partition 621, thereby stopping the air intake at the lower end of the second cloth bag 7 that needs to be cleaned. This allows the impurities inside the second cloth bag 7 to be removed, thus achieving cleaning. Since the impurities are intercepted inside the second cloth bag 7, the cleaning process of a single second cloth bag 7 will not cause other second cloth bags 7 to be re-adhered to by impurities, thereby improving the cleaning effect of the second cloth bag 7 and indirectly improving the dust removal effect.

[0047] Example 2, as Figures 1-10 As shown, the baffle plate 9 has a one-way groove 91 extending vertically; the one-way groove 91 aligns with the partition groove 621 after the baffle plate 9 moves; the inner wall of the one-way groove 91 is rotatably connected to the one-way plate 92 by a torsion spring 921; a limiting block 922 for limiting the one-way plate 92 is fixedly connected to the upper part of the inner wall of the one-way groove 91; an electromagnet 721 is provided inside the frame 72; the partition plate 62 is made of magnetic material.

[0048] When the baffle plate 9 moves under the control of the motor 631 to directly below the corresponding slot 621 and blocks the corresponding slot 621, the one-way slot 91 on the baffle plate 9 aligns with the slot 621. The one-way plate 92 blocks the one-way slot 91 under the action of the torsion spring 921. The one-way plate 92 presses against the limit block 922 under the action of the torsion spring 921. Then, the lifting frame 72 moves down to lift and gather the dust inside the second bag 7. The moisture in the dust will cause the dust to compact and clump together. The dust will squeeze the one-way plate 92 under the push of the lifting frame 72, so that the one-way plate 92 will flip over the torsion spring 921 in the one-way slot 91. After the one-way plate 92 flips, the one-way slot 91 will open, so that the dust at the lower position of the second bag 7 can pass through the baffle plate 9 and be discharged.

[0049] Subsequently, the one-way plate 92 flips and resets under the action of the torsion spring 921. After flipping, the one-way plate 92 abuts against the limit block 922, thereby achieving the blocking and sealing of the one-way groove 91. By setting the one-way groove 91 that can flow in one direction on the blocking plate 9, it can block the airflow of the second cloth bag 7 that is not in use, and also allow the impurities after cleaning to flow out from the second cloth bag 7 in time, avoiding the blockage at the lower position of the second cloth bag 7.

[0050] The partition 62 and the baffle 9 can be made thinner to avoid dust residue and improve the thoroughness of dust removal. Furthermore, in order to increase the force with which the scraper frame 72 scrapes out the dust inside the deactivated second cloth bag 7, an electromagnet 721 can be installed inside the scraper frame 72. When it is close to the partition 62, the electromagnet 721 inside the scraper frame 72 is triggered, so that the scraper frame 72 and the partition 62 increase the downward force of the scraper frame 72 under the action of magnetic force, thereby increasing the force of pushing out the impurities inside the deactivated second cloth bag 7. The electromagnet 721 is turned off when the deactivated second cloth bag 7 is switched to the activated second cloth bag 7, so that the scraper frame 72 can move up quickly and smoothly when the lower end of the activated second cloth bag 7 is ventilated.

[0051] Example 3, as Figures 1-10 As shown, the lower surface of the baffle plate 9 is provided with two pairs of extension plates 93; the edges of the extension plates 93 are adapted to the inner wall of the collection hopper 8; the extension plates 93 are provided with ventilation holes 931 through the left and right sides; the two ventilation holes 931 are connected by elastic sleeves 932.

[0052] One of the extension plates 93 is lower than the other extension plate 93; the extension plate 93 is elastic; a lever 82 is fixedly connected to the lower part of the inner wall of the collecting hopper 8; one of the extension plates 93 is in contact with the lever 82.

[0053] During the left-right movement of the baffle plate 9, the extension plate 93 will move in the left-right direction. The extension plate 93 can scrape off the dust on the inner wall of the collection hopper 8 and spread out the accumulated dust, so that the dust can be discharged more quickly. When the one-way groove 91 on the baffle plate 9 is aligned with the partition groove 621, the downward movement of the frame 72 will open the one-way plate 92 and allow the impurities to flow out from the one-way groove 91 from top to bottom. The impurities will enter between the two extension plates 93 from the one-way groove 91. The setting of the two extension plates 93 can separate the dust-containing gas in the collection hopper 8, so that the discharge of impurities in the one-way groove 91 is more stable. After entering the two extension plates 93, the impurities will fall directly near the lower port of the collection hopper 8 under the extension of the extension plates 93, so as to achieve smooth discharge of impurities.

[0054] For ease of description, the space formed between the two extension plates 93 is referred to as the extension cavity. The collection hopper 8 spaces on both sides of the extension cavity are connected through the vent holes 931, so that dust-laden gas can pass through the inner side of the elastic sleeve 932 without affecting the filtration of the other second filter bags 7. Furthermore, a lever 82 is provided at the lower position of the inner wall of the collection hopper 8. During the left and right movement of the two extension plates 93 with the baffle plate 9, the lower end of one extension plate 93 is lower than the lower end of the other extension plate 93, so that one extension plate 93 can be moved by the lever 82. One extension plate 93 adapts to the inner wall of the collection hopper 8 and leaves a deformation gap, which can be filled with the elastic sleeve 932. The sealing element satisfies both sealing and movement requirements. One extension plate 93 deforms and moves closer to another extension plate 93 when propelled by the lever 82, reducing the space inside the extension cavity. After deformation, the extension plate 93 can pass over the lever 82 and reset under its own elastic force, increasing the space inside the extension cavity. Multiple levers 82 are evenly distributed in the left and right directions, causing the extension cavity to expand and contract back and forth. When the extension cavity shrinks, it squeezes the dust inside the extension cavity, making the dust loose. When the extension cavity expands, it increases the space, facilitating the downward movement of dust. The back-and-forth movement of the extension cavity prevents dust from getting stuck inside and improves the smoothness of dust discharge.

[0055] Example 4, as Figures 1-10 As shown, a corrugated groove 65 is vertically provided on the front inner wall of the box 6; a movable block 73 is movably connected in the corrugated groove 65; the movable block 73 is fixedly connected to the front end of the frame 72.

[0056] The inner rear wall of the box 6 is vertically provided with a sliding groove 66; the rear end of the crossbar 71 is slidably connected in the sliding groove 66; the upper surface of the crossbar 71 is connected to the inner top wall of the box 6 by a tension spring 74.

[0057] As the frame 72 moves downwards, it pushes the dust inside the second cloth bag 7 downwards. This downward movement also causes the movable block 73 to move along the corrugated groove 65, resulting in the frame 72 moving left and right. When the frame 72 moves to the left, it pulls the second cloth bag 7 to bend to the left; when the frame 72 moves to the right, it pulls the second cloth bag 7 to bend to the right. This back-and-forth bending of the second cloth bag 7 causes the dust on its inner wall to quickly fall off as the inner wall deforms and cracks. This improves the efficiency of dust removal from the inner wall of the second cloth bag 7. The bending of the second cloth bag 7 to the left and right makes it less prone to dust accumulating on its inner wall, facilitating the removal of impurities. Furthermore, the bending of the second cloth bag 7 to the left and right pulls the crossbar 71 down along the slide groove 66, overcoming the tension spring 74. When the second cloth bag 7 returns to a vertical position, the tension spring 74 pulls the crossbar 71 up along the slide groove 66 again. The back-and-forth up-and-down movement of the second cloth bag 7 causes impurities inside the bag to fall off under vibration, improving the ease with which dust is removed.

[0058] Example 5, as Figures 11-14 As shown, the centralized dust collection system also includes a jaw crusher feeder spray pipe 21, a jaw crusher main unit centralized dust collection hood 22, a cone feeder hopper dust collection hood 31, a cone main unit centralized dust collection hood 32, a cone return screen dust collection hood 34, a screening feeder hopper dust collection hood 41, a screening main unit dust collection hood 42, and a screening finished product conveyor sealing cover 43. The dust collected during the crushing and screening process will be connected to the centralized dust collection pipe 55 through the jaw crusher main unit dust collection pipe 24, the cone feeder hopper dust collection pipe 36, the cone main unit dust collection pipe 35, and the screening main unit dust collection pipe 46. The centralized dust collection pipe 55 is connected to the centralized dust collector 5, which is an improved bag filter dust collector or a pulse bag filter dust collector.

[0059] The tracked mobile crushing and screening plant production line follows a process of "coarse crushing - fine crushing - screening". During the crushing and screening process, the dust generated by the material is centrally controlled through spraying, dust collection, and dust removal. The working process involves excavator 1 pouring sand and gravel into the hopper of jaw crusher 2. Some of the dust generated during the material feeding process is covered by the spray pipe 21 of the jaw crusher feeder. The remaining material moves into the main unit for crushing under the action of jaw crusher 2. The dust generated during the crushing process is covered by the centralized dust collection hood 22 of the jaw crusher main unit. The jaw crusher main unit's centralized dust collection hood 22 is equipped with a first dust collection fan (not shown in the figure). The dust enters the centralized dust collection pipe 55 through the jaw crusher main unit's dust collection pipe 24. The bottom of the centralized dust collection pipe 55 is supported by a dust collection pipe bracket 56. Finally, the dust is collected in the centralized dust collector 5. The stone crushed by the jaw crusher 2 is conveyed to the cone feed hopper 311 through the jaw crusher finished product conveyor 25. The jaw crusher finished product conveyor 25 is equipped with a jaw crusher conveyor sealing cover 23 to prevent dust from spreading everywhere. This process mainly completes the coarse crushing of the stone.

[0060] The jaw crusher finished product conveyor 25 transports the material to the cone feed hopper 311. As the material slides into the cone feed hopper 311, some dust is generated. The cone feed hopper 311 is equipped with a cone feed hopper dust collection hood 31, and a cone feed hopper dust collection pipe 36 is installed on the side of the cone feed hopper dust collection hood 31. A portion of the dust enters the centralized dust collection pipe 55 through the cone feed hopper dust collection pipe 36 and is collected by the centralized dust collector 5. The remaining material is transported by the cone feed conveyor 312 to the cone crusher 3 for fine crushing. The top of the cone crusher 3 is equipped with a cone main unit centralized dust collection hood 32. Dust generated during the cone fine crushing process is collected by the cone main unit centralized dust collection hood 32. 2. Cover it. A second dust collection fan (not shown in the figure) is set on the side of the cone crusher's centralized dust collection hood 32. The dust enters the centralized dust collection pipe 55 through the cone crusher's dust collection pipe 35 and is collected by the centralized dust collector 5. The material crushed by the cone crusher 3 enters the cone return screen 341 for screening. A cone return screen dust collection hood 34 is set on the cone return screen 341. A dust collection port (not shown in the figure) is set on the side of the cone return screen dust collection hood 34. The dust generated during the screening process enters the centralized dust collection pipe 55 and is collected by the centralized dust collector 5. The finished material crushed by the cone crusher 3 is conveyed to the next stage. This process mainly completes the fine crushing of stone.

[0061] The finished material crushed by cone crusher 3 is conveyed to the feeding hopper of screening host 4. The feeding hopper of screening host 4 is equipped with a screening feeding hopper dust collection hood 41. Dust generated during the material's descent enters the centralized dust collection pipe 55 through the screening feeding hopper dust collection pipe 47 and is collected by the centralized dust collector 5. The finished material is then conveyed to screening host 4 for material separation and screening. Screening host 4 is equipped with a screening host dust collection hood 42, and a third dust collection fan (not shown in the figure) is installed on the side of the screening host dust collection hood 42. Dust generated during the screening process enters the centralized dust collection pipe 55 through the dust collection pipe 46 of the screening host and is collected by the centralized dust collector 5. During the screening and classification process, finished materials of different specifications are conveyed by the screening finished product conveyor 431. The screening finished product conveyor 431 is equipped with a screening finished product conveyor sealing cover 43, a screening finished product conveyor head dust collection cover 44, and a finished product conveyor head spray 45. This process mainly completes the screening process of stone.

[0062] Dust generated during the "coarse crushing, fine crushing, and screening" process is removed by a centralized dust collector 5. This centralized dust collector 5 is either a pulse-jet bag filter or a modified pulse-jet bag filter. The pulse-jet bag filter's operation is controlled by a centralized electrical control system 53. The pulse-jet bag filter contains numerous first filter bags 57. When dust enters the pulse-jet bag filter through the centralized dust collector fan 52, the dust is adsorbed onto the first filter bags 57 and knocked off by the blower pipe 58. The falling dust enters a dust storage hopper 581. A dust discharge screw conveyor 54 is installed at the bottom of the dust storage hopper 581, which transports the dust out. The treated air is then discharged through the exhaust pipe 51. This completes the tracked vehicle movement. This invention relates to a centralized dust removal process for a mobile crushing and screening plant production line. Centralized dust removal prevents dust from spreading, ensuring environmental friendliness and meeting emission standards. It optimizes and upgrades the structure and principle of traditional dust removal processes by installing multiple dust collection covers on the equipment and providing centralized dust collection via side-mounted fan dust collection ports. For areas with scarce water resources and low winter temperatures where water pipes are prone to freezing, this dust removal solution overcomes the drawbacks of spray dust removal. The combination of spray dust removal, sealed cover dust removal, and dust collector dust removal results in better dust removal performance. The entire production line features centralized dust control, making operation and maintenance convenient. This invention is suitable for large-scale mining industries, particularly in areas with surrounding residential areas and strict local environmental regulations.

[0063] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centralized dust removal system for a tracked mobile crushing and screening station, characterized in that: The invention includes an improved baghouse dust collector; the improved baghouse dust collector includes a housing, a second filter bag, and a collection hopper; the lower port of the housing is fixedly connected to the upper port of the collection hopper; the lower port of the collection hopper is sequentially connected to a ash discharge screw conveyor, a rotary valve, and a scraper conveyor; an air inlet flange is provided at the left end of the collection hopper; an air outlet flange is provided on the upper right side of the housing; a partition plate with a slit is fixedly connected to the lower part of the inner side of the housing; the upper end of the second filter bag is connected to the inner wall of the housing via a crossbar, and the lower end is fixedly connected to the slit; a frame is fitted on the outer side of the second filter bag; a screw rod is rotatably connected to the inner side of the housing, and a sliding rod is fixedly connected; the screw rod is driven by a motor; the screw rod is threadedly connected to a baffle plate; the baffle plate is slidably connected to the sliding rod; the upper surface of the baffle plate contacts the lower surface of the partition plate and can block the slit; The shield is provided with a one-way groove running through it from top to bottom; the inner wall of the one-way groove is rotatably connected to the one-way plate by a torsion spring; a limiting block for limiting the one-way plate is fixedly connected to the upper part of the inner wall of the one-way groove; an electromagnet is provided inside the frame; the partition is made of magnetic material.

2. A centralized dust removal system for a tracked mobile crushing and screening station according to claim 1, characterized in that: The outer wall of the screw is fitted with an elastic folding sleeve; one end of the elastic folding sleeve is fixedly connected to the baffle plate, and the other end is fixedly connected to the inner wall of the box.

3. A centralized dust removal system for a tracked mobile crushing and screening station according to claim 1, characterized in that: The lower surface of the baffle plate is provided with two pairs of extension plates; the edges of the extension plates are adapted to the inner wall of the collection hopper; the extension plates are provided with ventilation holes through the left and right sides; the two ventilation holes are connected by an elastic sleeve.

4. A centralized dust removal system for a tracked mobile crushing and screening station according to claim 3, characterized in that: One of the extension plates has a lower end that is lower than the lower end of the other extension plate; the extension plates are elastic; a lever is fixedly connected to the lower part of the inner wall of the collecting hopper; one of the extension plates has a lower end that is in contact with the lever.

5. A centralized dust removal system for a tracked mobile crushing and screening station according to claim 1, characterized in that: The inner front wall of the box is vertically provided with a corrugated groove; a movable block is movably connected within the corrugated groove; the movable block is fixedly connected to the front end of the frame.

6. A centralized dust removal system for a tracked mobile crushing and screening station according to claim 5, characterized in that: A vertical groove is provided on the rear inner wall of the box; a crossbar is slidably connected to the rear end of the crossbar; the upper surface of the crossbar is connected to the top wall of the box through a tension spring.

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