Centralized dust removal system for crawler belt moving type crushing and screening station

Abstract

The invention relates to the technical field of dust removal, in particular to a centralized dust removal system for a crawler belt moving type crushing and screening station. Comprising an improved cloth bag type dust collector, the improved bag-type dust collector comprises a box body, a second bag and a collecting hopper; the lower port of the box body is fixedly connected with the upper port of the collecting hopper; the lower end opening of the collecting hopper is sequentially connected with an ash discharging screw conveyor, an air closing machine and a scraper; an air inlet flange is arranged at the left end of the collecting hopper; an air outlet flange is arranged on the right upper side of the box body; according to the cloth bag cleaning device, the baffle plates are regularly and sequentially moved to the position under the partition grooves, so that air inflow of the second cloth bag needing to be cleaned is stopped at the lower end, and impurities on the inner side of the second cloth bag are stripped away to achieve cleaning; the situation that other second cloth bags are secondarily adhered by impurities in the cleaning process of a single second cloth bag is avoided, the cleaning effect of the second cloth bags is improved, and then the dust removal effect is indirectly improved.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal, in particular to a centralized dust removal system for a crawler mobile crushing and screening station. Background Art

[0002] In recent years, with the development of urban infrastructure and large-scale mining, mobile crushing and screening equipment has become increasingly prominent. In the traditional mining industry, raw materials after blasting undergo a series of process steps, including coarse crushing, fine crushing, and screening. When crushing and screening equipment sorts the material into different sizes and types, it generates large amounts of dust, polluting the surrounding environment. Consequently, many people are concerned about the environmental impact of mobile crushing and screening plants, which are often used in open-air environments. Therefore, how to address the dust generated by crushing and screening equipment during operation has become a thorny issue.

[0003] Currently, most mobile crushing and screening equipment in open-pit mining mainly adopts the following measures for dust control: The first is water spraying: This involves using a water spray system during the crushing and screening process to reduce dust generation and dispersion. Water spraying is currently a common dust control measure in mines. While it can reduce some dust, it requires a large amount of water, making it unsuitable for areas with limited water resources. Furthermore, in some areas, where winter temperatures are low, water easily freezes, making water spraying impractical.

[0004] The second method is to use a "closed conveyor belt": using a closed conveyor belt to reduce dust emissions during material transportation; using the "closed conveyor belt" dust reduction measure requires adding a dust cover to the conveyor belt. Although it can suppress the dust during material transportation, the dust removal effect is not ideal. Installing a dust cover on the conveyor cannot achieve full sealing, and the manufacturing cost is high. When the wind around the mine is strong, this measure cannot be used to reduce dust. The third type is "wet crushing": When possible, use wet crushing technology to reduce dust generation; when using this measure for dust removal, the processed material contains a lot of water, and a special area is needed to dry the material to remove the moisture on the surface of the material. For some mixing stations, the moisture content of the material is strictly controlled, and this measure cannot meet the requirements. The fourth method is to equip the construction site with dust removal equipment: equip with high-efficiency dust removal equipment, such as bag dust collectors 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 hosts. Although this can solve part of the dust, it requires a lot of manpower and material resources to maintain. When there are multiple crushing and screening equipment on a whole production line, multiple dust collectors are required, and the equipment cannot be interlocked. When a device fails in the middle, the entire line cannot be shut down.

[0005] Most of the existing dust collectors are pulse-type dust collectors. After the dust enters the dust collector along the air inlet, it passes through the inside of the cloth bag from the outside to the inside, and is finally discharged along the inside of the cloth bag. The dust is intercepted and filtered on the outer wall of the cloth bag. During the dust removal process of the dust collector, if it is detected that the filtering effect of the cloth bag is poor, the electromagnetic pulse valve will be triggered to make the spray pipe impact the inside of the cloth bag, and the gas will pass through the cloth bag from the inside to the outside to realize the dust recoil and fall off. In order to ensure the working continuity of the dust collector, the dust collector does not stop to recoil and clean the cloth bag. The airflow of the cloth bag being cleaned is from the inside to the outside, and the airflow of the cloth bag being filtered is from the outside to the inside. The dust that recoils and falls off from the cleaned cloth bag will be driven by the surrounding airflow to adhere to the outer wall of the cloth bag being filtered, resulting in secondary adhesion, resulting in poor cleaning effect of the cloth bag in the existing dust collector, affecting the dust removal effect. Summary of the Invention

[0006] In order to make up for the shortcomings of the prior art, the present invention proposes a centralized dust removal system for a crawler mobile crushing and screening station. The present invention periodically moves the baffle plate to the bottom of the partition slot, so that the second bag that needs to be cleaned stops taking in air near the lower end, thereby allowing the impurities inside the second bag to be removed and cleaned. Since the impurities are intercepted inside the second bag, the cleaning process of a single second bag will not cause other second bags to be adhered to by impurities for the second time, thereby improving the cleaning effect of the second bag and indirectly improving the dust removal effect.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the centralized dust removal system for a crawler mobile crushing and screening station described in the present invention comprises an improved bag-type dust collector; the improved bag-type dust collector comprises a box body, a second bag and a collecting bucket; the lower port of the box body is fixedly connected to the upper port of the collecting bucket; the lower port of the collecting bucket is connected to the ash discharging screw conveyor, the fan and the scraper in sequence; the left end of the collecting bucket is provided with an air inlet flange; the upper right side of the box body is provided with an air outlet flange; the lower position of the inner side of the box body is fixedly connected to a partition with a partition groove; the upper end of the second bag is connected to the inner wall of the box body through a cross bar, and the lower end is fixedly connected to the partition groove; the outer side of the second bag is sleeved with a frame; the inner side of the box body is connected to a screw for left and right rotation and is fixedly connected to a sliding rod; the screw is driven by a motor; the screw is threadedly connected to a shielding plate; the shielding plate is slidably connected to the sliding rod; the upper surface of the shielding plate contacts the lower surface of the partition and can shield the partition groove.

[0008] Preferably, an elastic folding sleeve is provided on the outer wall of the screw rod; one end of the elastic folding sleeve is fixedly connected to the shielding plate, and the other end is fixedly connected to the inner wall of the box.

[0009] Preferably, a one-way groove is provided through the upper and lower parts of the shielding plate; the one-way groove is aligned 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 through a torsion spring; the upper position of the inner wall of the one-way groove is fixedly connected to a limit block for limiting the one-way plate.

[0010] Preferably, an electromagnet is provided inside the frame; and the partition is made of magnetic material.

[0011] Preferably, two pairs of extension plates are provided on the lower surface of the shielding plate; the edges of the extension plates are adapted to the inner wall of the collecting hopper; air holes are provided on the left and right sides of the extension plates; and the two air holes are connected by an elastic sleeve.

[0012] Preferably, the lower end of one of the extension plates is lower than the lower end of the other extension plate; the extension plate is elastic; the lower position of the inner wall of the collecting bucket is fixedly connected to the shift block; the lower end of one of the extension plates is in contact with the shift block.

[0013] Preferably, a corrugated groove is vertically provided on the front inner wall of the box body; a movable block is movably connected in the corrugated groove; and the movable block is fixedly connected to the front end of the frame.

[0014] Preferably, a slide groove is vertically provided on the rear inner wall of the box body; the rear end of the cross bar is slidably connected in the slide groove; and the upper surface of the cross bar is connected to the top wall of the box body through a tension spring.

[0015] Preferably, the centralized dust removal system also includes a jaw crusher feeder spray pipe, a jaw crusher main unit centralized dust collection hood, a cone upper hopper dust collection hood, a cone main unit centralized dust collection hood, a cone return screen dust collection hood, a screening upper hopper dust collection hood, a screening main unit dust collection hood and a screening finished product conveyor sealing hood. 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 upper 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-type dust collector.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention moves the baffle plate to the bottom of the partition groove at regular intervals, so that the second bag that needs to be cleaned stops taking in air near the lower end, thereby removing impurities on the inside of the second bag and achieving cleaning. Since the impurities are intercepted inside the second bag, the cleaning process of a single second bag will not cause the impurities to adhere to other second bags for the second time, thereby improving the cleaning effect of the second bag and indirectly improving the dust removal effect.

[0017] 2. The present invention provides a one-way groove capable of one-way flow on the baffle plate, thereby, on the one hand, being able to block the airflow of the inactive second cloth bag, and on the other hand, being able to ensure that the cleaned impurities flow out of the inactive second cloth bag in time, thereby avoiding the blockage of the lower position of the inactive second cloth bag.

[0018] 3. The setting of the two extension plates in the present invention can separate the dust-containing gas in the collection bucket, 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 position of the collection bucket under the extension of the extension plates, so as to achieve smooth discharge of impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 It is a three-dimensional diagram of the improved bag-type dust collector of the present invention; Figure 2 yes Figure 1 Stereoscopic image from the right side perspective; Figure 3 yes Figure 1 sectional view of Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 3 Enlarged view of point B in the middle; Figure 6 yes Figure 3 Enlarged view of point C in the middle; Figure 7 It is a position diagram of the corrugated groove in the present invention; Figure 8 It is a position diagram of the chute in the present invention; Figure 9 is a perspective view of the second cloth bag of the present invention; Figure 10 It is a three-dimensional diagram of the screw rod, the sliding rod and the shielding plate in the present invention; Figure 11 It is a schematic diagram of the structure of the dust removal system of the present invention; Figure 12 It is a schematic diagram of the equipment involved in the dust removal system of the present invention; Figure 13 It is the dust removal flow chart of the present invention; Figure 14 It is a structural diagram of the pulse bag dust collector in the present invention.

[0021] Figure: 1. Excavator; 2. Jaw crusher; 21. Jaw crusher feeder spray pipe; 22. Jaw crusher mainframe centralized dust collection hood; 23. Jaw crusher conveyor sealing cover; 24. Jaw crusher mainframe dust collection pipe; 25. Jaw crusher finished product conveyor; 3. Cone crusher; 31. Cone feed hopper dust collection hood; 311. Cone feed hopper; 312. Cone feed conveyor; 32. Cone mainframe 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 upper hopper dust collection pipe; 4. Screening main unit; 41. Screening upper hopper dust collection cover; 42. Screening main unit dust collection cover; 43. Screening finished product conveyor sealing cover; 431. Screening finished product conveyor; 44. Screening finished product conveyor head dust collection cover; 45. Finished product conveyor head spray; 46. Screening main unit dust collection pipe; 47. Screening upper hopper dust collection pipe; 5. Centralized dust removal 51. Exhaust pipe; 52. Centralized dust removal fan; 53. Centralized electric control system; 54. Ash discharge screw conveyor; 55. Centralized dust collection pipe; 56. Dust collection pipe bracket; 57. First bag; 58. Blowing pipe; 581. Dust storage hopper; 59. Air compressor; 591. Air storage tank; 6. Box; 61. Exhaust flange; 62. Partition; 621. Partition slot; 63. Screw; 631. Motor; 632. Elastic folding Sleeve; 64, slide bar; 65, corrugated groove; 66, slide groove; 67, bracket; 7, second cloth bag; 71, cross bar; 72, frame; 721, electromagnet; 73, movable block; 74, tension spring; 8, collecting bucket; 81, air inlet flange; 82, shift block; 9, baffle plate; 91, one-way groove; 92, one-way plate; 921, torsion spring; 922, limit block; 93, extension plate; 931, air vent; 932, elastic sleeve. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] 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 crawler mobile crushing and screening station includes an improved bag-type dust collector; the improved bag-type dust collector includes a box body 6, a second bag 7 and a collecting bucket 8; the box body 6 is supported by a bracket 67; the lower end of the box body 6 is fixedly connected to the upper end of the collecting bucket 8; the lower end of the collecting bucket 8 is connected in sequence to an ash discharge screw conveyor 54, a fan (not shown in the figure) and a scraper (not shown in the figure); the left end of the collecting bucket 8 is provided with an air inlet flange 81; the upper right side of the box body 6 is provided with an air outlet flange 61; the lower inner side of the box body 6 is provided with a plurality of air outlet flanges. It is fixedly connected to the partition 62 with the partition groove 621; the upper end of the second cloth bag 7 is connected to the inner wall of the box body 6 through the cross bar 71, and the lower end is fixedly connected to the partition groove 621; the outer side of the second cloth bag 7 is sleeved with a frame 72; the inner side of the box body 6 is connected to the screw 63 and is fixedly connected to the slide rod 64; the screw 63 is driven by the motor 631; the screw 63 is threadedly connected to the baffle plate 9; the baffle plate 9 is slidably connected to the slide rod 64; the upper surface of the baffle plate 9 is in contact with the lower surface of the partition 62, and can block the partition groove 621.

[0024] An elastic folding sleeve 632 is sleeved on the outer wall of the screw rod 63 ; one end of the elastic folding sleeve 632 is fixedly connected to the shielding plate 9 , and the other end is fixedly connected to the inner wall of the box body 6 .

[0025] After the dust in the crushing and screening process is collected and enters the air inlet flange 81 with the air flow, the dust-laden air will enter the collecting hopper 8 along the air inlet flange 81, and the dust-laden gas will pass through the partition groove 621 from bottom to top and enter the inner side of the second bag 7, and the dust and water vapor will be intercepted inside the second bag 7, and the clean air will pass through the second bag 7 from the inside to the outside and enter the outer side of the second bag 7, and the clean air will finally converge and be discharged along the air outlet flange 61. The screw 63 on the inner wall of the box body 6 is provided with an elastic folding sleeve 632, and the elastic folding sleeve 632 protects the screw 63 to prevent dust and other impurities from adhering to the screw 63 and affecting the rotation of the screw 63. The motor 631 will It rotates regularly, and the motor 631 drives the screw 63 to rotate during the rotation, and the screw 63 drives the baffle plate 9 to slide along the slide bar 64 during the rotation, so that the baffle plate 9 will move in the left and right directions, and the baffle plate 9 will move to the corresponding lower port of the partition 621 in turn and block the corresponding partition 621. Each time the baffle plate 9 blocks the partition 621, it will stay for a period of time. After the lower port of the partition 621 is blocked by the baffle plate 9, the dust-laden gas cannot pass through the partition 621 from bottom to top into the second cloth bag 7, that is, the lower port of the second cloth bag 7 is blocked, and the second cloth bag 7 whose lower port is not blocked still maintains the dust-laden gas filtration from the inside to the outside.

[0026] For the sake of convenience, the second cloth bag 7 whose lower port is not blocked is called the activated second cloth bag 7, and the second cloth bag 7 whose lower port is blocked is called 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, thereby shrinking the deactivated second cloth bag 7. The pressure on the outside of the deactivated second cloth bag 7 decreases under the flow of airflow. When there is a pressure difference between the inside and the outside of the deactivated second cloth bag 7, the gas inside the deactivated second cloth bag 7 will flow out to the outside, so that the deactivated second cloth bag 7 is smoothly deflated.

[0027] When no dust-laden gas enters the lower port of the inactivated second bag 7, the weight of the pulling frame 72 is greater than the resistance, so that the pulling frame 72 will move downward under the action of its own gravity, and the inner cross-section of the pulling frame 72 is adapted to the cross-section of the deflated second bag 7. In this way, during the downward movement of the pulling frame 72, the pulling frame 72 will pull the impurities on the inner wall of the inactivated second bag 7 downward, and the gas inside the inactivated second bag 7 will be squeezed and flow out from the inside to the outside. The impurities inside the inactivated second bag 7 will eventually be pulled into the partition 621 and the lower end of the inactivated second bag 7. After the dust gathers together, it is convenient for subsequent shedding. After the impurities inside the inactivated second bag 7 are pulled down, the impurities inside the inactivated second bag 7 are cleaned, and then the motor 631 is controlled to drive The screw 63 shielding plate 9 moves to the position of the lower end of the next partition 621 and blocks the lower end of the downward partition 621. The shielding plate 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 shielding plate 9. The shielding plate 9 is removed from under the inactive second cloth bag 7. After the shielding plate 9 is removed from under the inactive second cloth bag 7 that has completed cleaning, the accumulated impurities on the inside of the inactive second cloth bag 7 will move downward and fall. The accumulated impurities will pass through the partition 621 and fall into the collecting bucket 8, and finally flow out along the lower end of the collecting bucket 8. The lower end of the collecting bucket 8 is connected to the ash discharge screw conveyor 54, the fan and the scraper. The specific ash discharge principle and process are existing technologies and will not be elaborated here.

[0028] After the impurities gathered at the lower position inside the inactive second bag 7 fall off, the inactive second bag 7 will turn towards the active second bag 7, and the dust-laden gas will re-enter the active second bag 7 after the transition along the collecting bucket 8. When the gas enters the inner side of the active second bag 7 from bottom to top, the active second bag 7 after the transition will gradually resume its expansion and bulge. During the expansion process from bottom to top, the lifting frame 72 will be pushed upward until the active second bag 7 is fully expanded and bulged, and the lifting frame 72 will also move to a position close to the cross bar 71. , each activated second cloth bag 7 will be transformed into a deactivated second cloth bag 7, and the deactivated second cloth bag 7 will be transformed back into an activated second cloth bag 7; all the second cloth bags 7 in the box body 6 are cleaned to ensure the filtering effect of the second cloth bag 7 on the dust-laden gas; when there is no need to clean the second cloth bag 7, the baffle 9 will move to a position staggered with the partition groove 621 to ensure that all the partition grooves 621 are unobstructed; the second cloth bag 7 in this embodiment can be set to be detachable for easy replacement, and specifically a snap-fit ​​structure can be used. This is a prior art and will not be elaborated on.

[0029] The present invention moves the baffle plate 9 to the bottom of the partition groove 621 at regular intervals, so that the second cloth bag 7 that needs to be cleaned stops taking in air near the lower end, and the impurities inside the second cloth bag 7 are removed to achieve 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 the impurities to adhere to other second cloth bags 7 for the second time, thereby improving the cleaning effect of the second cloth bag 7 and indirectly improving the dust removal effect.

[0030] Example 2, as Figures 1-10 As shown, the baffle plate 9 is provided with a one-way groove 91 running through it from top to bottom; the one-way groove 91 is aligned with the partition groove 621 as the baffle plate 9 moves; the inner wall of the one-way groove 91 is rotatably connected to the one-way plate 92 through a torsion spring 921; the inner wall of the one-way groove 91 is fixedly connected to a limit block 922 for limiting the one-way plate 92 at the upper position, and an electromagnet 721 is provided inside the frame 72; the partition 62 is made of magnetic material.

[0031] When the shielding plate 9 moves to the bottom of the corresponding partition 621 under the control of the motor 631 and blocks the corresponding partition 621, the one-way slot 91 on the shielding plate 9 is aligned with the partition 621, and the one-way plate 92 blocks the one-way slot 91 under the action of the torsion spring 921. The one-way plate 92 is pressed against the limit block 922 under the action of the torsion spring 921, and then the frame 72 moves downward to roll up and gather the dust on the inside of the deactivated second cloth bag 7. The moisture in the dust will cause the dust to be compacted and agglomerated. The dust will squeeze the one-way plate 92 under the push of the frame 72, so that the one-way plate 92 can overcome the torsion spring 921 and flip over in the one-way slot 91. After the one-way plate 92 flips over, the one-way slot 91 will open, so that the dust at the lower position of the deactivated second cloth bag 7 can be discharged through the shielding plate 9.

[0032] Subsequently, the one-way plate 92 flips and resets under the action of the torsion spring 921. After flipping, the one-way plate 92 rests on the limit block 922 to achieve shielding and sealing of the one-way groove 91. By providing a one-way groove 91 capable of one-way flow on the shielding plate 9, on the one hand, it is possible to block the airflow of the inactive second cloth bag 7, and on the other hand, it is possible to ensure that the cleaned impurities flow out of the inactive second cloth bag 7 in time, thereby avoiding the blockage of the lower position of the inactive second cloth bag 7.

[0033] The partition 62 and the shielding plate 9 can be set to a thinner state to avoid dust residue and improve the thoroughness of dust discharge; further, in order to increase the force of the ejection frame 72 to eject the dust inside the inactivated second cloth bag 7, an electromagnet 721 can be set in the ejection frame 72. When the ejection frame 72 is close to the partition 62, the electromagnet 721 in the ejection frame 72 is triggered, so that the ejection frame 72 and the partition 62 increase the downward force of the ejection frame 72 under the action of magnetic force, thereby increasing the force to push out impurities in the inactivated second cloth bag 7. The electromagnet 721 is turned off when the inactivated second cloth bag 7 is switched to the activated second cloth bag 7, so that the ejection frame 72 can move up quickly and smoothly when the second cloth bag 7 is activated and ventilated near the lower end.

[0034] Example 3, as Figures 1-10 As shown, two pairs of extension plates 93 are provided on the lower surface of the baffle plate 9; the edges of the extension plates 93 are adapted to the inner wall of the collecting hopper 8; air holes 931 are provided on the left and right sides of the extension plates 93; the two air holes 931 are connected by an elastic sleeve 932.

[0035] The lower end of one of the extension plates 93 is lower than the lower end of the other extension plate 93; the extension plate 93 is elastic; the lower position of the inner wall of the collecting bucket 8 is fixedly connected to the shift block 82; the lower end of one of the extension plates 93 is in contact with the shift block 82.

[0036] During the left and right movement of the shielding plate 9, the extension plate 93 will be driven to move left and right. The extension plate 93 can scrape off the dust on the inner wall of the collecting bucket 8, and can also spread out the accumulated dust, so that the dust can be discharged faster; when the one-way groove 91 on the shielding plate 9 is aligned with the partition groove 621, the downward movement of the frame 72 will open the one-way plate 92 and the impurities will flow out from the one-way groove 91 from top to bottom. The impurities will enter from the one-way groove 91 between the two extension plates 93. The setting of the two extension plates 93 can separate the dust-containing gas in the collecting bucket 8, thereby making the discharge of impurities in the one-way groove 91 more stable. After entering the two extension plates 93, the impurities will fall directly near the lower port position of the collecting bucket 8 under the extension of the extension plate 93, so as to achieve smooth discharge of impurities.

[0037] For the sake of convenience, the space formed between the two extension plates 93 is called an extension cavity, and the spaces of the collecting bucket 8 on both sides of the extension cavity are connected through the air vents 931, so that the dust-laden gas can pass through the inner side of the elastic sleeve 932 without affecting the filtration of other second cloth bags 7; further, a shift block 82 is provided at the lower position of the inner wall of the collecting bucket 8, and when the two extension plates 93 move left and right with the shielding plate 9, the lower end of one of the extension plates 93 is lower than the lower end of the other extension plate 93, so that one of the extension plates 93 can be shifted by the shift block 82, and one of the extension plates 93 is adapted to the inner wall of the collecting bucket 8, and a deformation gap is left, which can be filled with elastic The flexible seal can meet the requirements of sealing and movement at the same time. One of the extension plates 93 is deformed and moved closer to the other extension plate 93 when the shift block 82 is shifted, so that the space in the extension cavity becomes smaller. After deformation, the extension plate 93 can pass over the shift block 82 and reset under the action of its own elastic force, so that the space in the extension cavity becomes larger. Multiple shift blocks 82 are evenly distributed in the left and right directions, so that the extension cavity will expand and shrink back and forth. In the process of the extension cavity becoming smaller, the dust in the extension cavity will be squeezed and loosened. When the extension cavity becomes larger, the space will become larger, which is convenient for the downward movement of dust. When the extension cavity changes back and forth, dust is prevented from getting stuck in the extension cavity, thereby improving the smoothness of dust discharge.

[0038] Example 4, as Figures 1-10 As shown, a corrugated groove 65 is vertically provided on the front inner wall of the box body 6; a movable block 73 is movably connected in the corrugated groove 65; and the movable block 73 is fixedly connected to the front end of the frame 72.

[0039] A slide groove 66 is vertically provided on the rear inner wall of the box body 6; the rear end of the cross bar 71 is slidably connected in the slide groove 66; the upper surface of the cross bar 71 is connected to the inner top wall of the box body 6 through a tension spring 74.

[0040] During the downward movement of the pulling frame 72, the dust inside the inactive second cloth bag 7 will be pulled downward, and the moving block 73 will be driven to move along the corrugated groove 65 during the downward movement of the pulling frame 72, so that the pulling frame 72 will also move left and right during the downward movement. When the pulling frame 72 moves to the left, the inactive second cloth bag 7 will bend to the left, and when the pulling frame 72 moves to the right, the inactive second cloth bag 7 will bend to the right. In this way, when the inactive second cloth bag 7 bends back and forth left and right, the dust on the inner wall of the inactive second cloth bag 7 will fall off quickly as the inner wall of the inactive second cloth bag 7 is deformed and cracked. When the second cloth bag 7 is inoperative, the dust on the inner wall of the inoperative second cloth bag 7 is improved; when the second cloth bag 7 is inoperative and bends left and right, the dust on the inner wall of the inoperative second cloth bag 7 is not easy to compact, which facilitates the falling of impurities; further, when the second cloth bag 7 is inoperative and bends left and right, the cross bar 71 will be pulled to slide downward along the slide groove 66 to overcome the tension spring 74. When the second cloth bag 7 is inoperative and returns to vertical, the tension spring 74 will pull the cross bar 71 up along the slide groove 66 again. When the second cloth bag 7 is inoperative and fluctuates up and down, the impurities inside the inoperative second cloth bag 7 will fall off under the action of vibration, thereby improving the smoothness of the dust being pulled off.

[0041] Example 5, as Figure 11-14 As shown, the centralized dust removal system also includes a jaw crusher feeder spray pipe 21, a jaw crusher main unit centralized dust collection hood 22, a cone upper hopper dust collection hood 31, a cone main unit centralized dust collection hood 32, a cone return screen dust collection hood 34, a screening upper hopper dust collection hood 41, a screening main unit dust collection hood 42 and a screening finished product conveyor sealing hood 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 upper 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-type dust collector or a pulse bag-type dust collector.

[0042] The production line process of crawler mobile crushing and screening station is "coarse crushing - fine crushing - screening". The dust generated by the material in the crushing and screening process is centrally controlled through spraying - dust collection - dust removal. Its working process is that the excavator 1 pours sand and gravel into the hopper of the jaw crusher 2. Part of the dust generated during the stone introduction process will be covered by the jaw crusher feeder spray pipe 21. The other part of the stone moves into the main machine under the action of the jaw crusher 2 and is crushed. The dust generated during the crushing process is covered by the jaw crusher main machine centralized dust collection cover 22. A first dust collecting fan (not shown in the figure) is provided on the side of the centralized dust collecting cover 22 of the jaw crusher main unit. The dust enters the centralized dust collecting pipe 55 through the jaw crusher main unit dust collecting pipe 24. The bottom of the centralized dust collecting pipe 55 is supported by a dust collecting 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 conical upper hopper 311 through the jaw crusher finished product conveyor 25. The jaw crusher finished product conveyor 25 is provided with a jaw crusher conveyor sealing cover 23 to prevent dust from spreading everywhere. This process mainly completes the coarse crushing of the stone. The jaw crusher finished product conveyor 25 conveys the material to the cone upper hopper 311. When the material slides into the cone upper hopper 311, some dust will also be generated. The cone upper hopper 311 is provided with a cone upper hopper dust collecting cover 31. The cone upper hopper dust collecting cover 31 is provided with a cone upper hopper dust collecting pipe 36 on the side. Part of the dust enters the centralized dust collecting pipe 55 through the cone upper hopper dust collecting pipe 36 and is collected by the centralized dust collector 5. The rest of the material is conveyed by the cone feeding conveyor 312 to the cone crusher 3 for fine crushing. A cone mainframe centralized dust collecting cover 32 is provided on the top of the cone crusher 3. The dust generated in the process of cone fine crushing is collected by the cone mainframe centralized dust collecting cover 33. 2. A second dust collecting fan (not shown in the figure) is provided on the side of the centralized dust collecting cover 32 of the cone main machine. The dust enters the centralized dust collecting pipe 55 through the cone main machine dust collecting 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. The cone return screen 341 is provided with a cone return screen dust collecting cover 34. The side of the cone return screen dust collecting cover 34 is provided with a dust collecting port (not shown in the figure). The dust generated during the screening process enters the centralized dust collecting pipe 55 and is collected by the centralized dust collector 5. The finished material crushed by the cone crusher 3 is transported to the next link. This process mainly completes the fine crushing of the stone. The finished material crushed by the cone crusher 3 is transported to the upper hopper of the screening host 4. The upper hopper of the screening host 4 is provided with a screening upper hopper dust collecting cover 41. The dust generated during the falling process of the material enters the centralized dust collecting pipe 55 through the screening upper hopper dust collecting pipe 47 and is collected by the centralized dust collector 5. The finished material is then transported to the screening host 4 for material sorting and screening. The screening host 4 is provided with a screening host dust collecting cover 42. The side of the screening host dust collecting cover 42 is provided with a third dust collecting fan (not shown in the figure). ), the dust generated during the screening process enters the centralized dust collecting pipe 55 through the screening host dust collecting pipe 46, and is collected by the centralized dust collector 5; during the screening and classification process, the finished materials of different specifications after screening are conveyed by the screening finished product conveyor 431, and the screening finished product conveyor sealing cover 43, the screening finished product conveyor head dust collecting cover 44 and the finished product conveyor head spray 45 are respectively provided above the screening finished product conveyor 431. This process mainly completes the screening process of the stone; The dust generated in the process of "coarse crushing-fine crushing-screening" is collected by the centralized dust collector 5. The centralized dust collector 5 is a pulse bag dust collector or an improved bag dust collector. The pulse bag dust collector is time-controlled by a centralized electronic control system 53. A large number of first bags 57 are arranged inside the pulse bag dust collector. When the dust enters the pulse bag dust collector through the centralized dust removal fan 52, the dust is adsorbed on the first bags 57 and is beaten down by the blowing pipe 58. The fallen dust enters the dust storage hopper 581. An ash discharge screw conveyor 54 is arranged at the bottom of the dust storage hopper 581. The dust is transported out by the ash discharge screw conveyor 54, and the treated air is discharged through the exhaust pipe 51. At this time, the crawler moving is completed. Centralized dust removal process for the production line of a dynamic crushing and screening station; centralized dust removal prevents dust from spreading everywhere, is green and environmentally friendly, and meets environmental emission standards; combined with traditional dust removal technology, its structural principle is optimized and upgraded, and a variety of dust collection shields are set on the equipment to cover it, and a fan dust collection port is set on the side to collect dust centrally; for areas with scarce water resources and low temperatures in winter where water pipes are prone to freezing, this dust removal solution solves the drawbacks of spray dust removal; the three dust removal methods of "spray dust removal + sealed shield covering dust removal + dust collector dust removal" are combined with each other to achieve better dust removal effect; the dust removal of the entire production line is centrally controlled, easy to operate and maintain; the present invention is suitable for large-scale mining industries, and is suitable for areas with residents around the mining area and strict local environmental protection requirements.

[0043] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood 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 cannot be understood as indicating or implying relative importance.

[0044] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A centralized dust removal system for a crawler mobile crushing and screening station, characterized by: It comprises an improved bag-type dust collector; the improved bag-type dust collector comprises a box body, a second bag and a collecting bucket; the lower port of the box body is fixedly connected to the upper port of the collecting bucket; the lower port of the collecting bucket is connected in sequence to a dust discharge screw conveyor, a fan and a scraper; the left end of the collecting bucket is provided with an air inlet flange; the upper right side of the box body is provided with an air outlet flange; the lower position of the inner side of the box body is fixedly connected to a partition with a partition groove; the upper end of the second bag is connected to the inner wall of the box body through a cross bar, and the lower end is fixedly connected to the partition groove; the outer side of the second bag is sleeved with a frame; the inner side of the box body is connected to a screw rod for left and right rotation and is fixedly connected to a sliding rod; the screw is driven by a motor; the screw thread transmission is connected to a shielding plate; the shielding plate is slidably connected to the sliding rod; the upper surface of the shielding plate is in contact with the lower surface of the partition plate and can shield the partition groove.

2. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 1, characterized in that: An elastic folding sleeve is sleeved on the outer wall of the screw rod; one end of the elastic folding sleeve is fixedly connected to the shielding plate, and the other end is fixedly connected to the inner wall of the box.

3. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 1, characterized in that: The shielding plate is provided with a one-way groove running through the upper and lower parts; the inner wall of the one-way groove is rotatably connected to the one-way plate through a torsion spring; the upper position of the inner wall of the one-way groove is fixedly connected to a limit block for limiting the one-way plate.

4. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 3, characterized in that: An electromagnet is arranged inside the frame; and the partition is made of magnetic material.

5. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 3, characterized in that: Two pairs of extension plates are provided on the lower surface of the shielding plate; the edges of the extension plates are adapted to the inner wall of the collecting hopper; air holes are provided through the left and right sides of the extension plates; and the two air holes are connected by an elastic sleeve.

6. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 5, characterized in that: The lower end of one of the extension plates is lower than the lower end of the other extension plate; the extension plate is elastic; the lower position of the inner wall of the collecting bucket is fixedly connected to the shift block; the lower end of one of the extension plates is in contact with the shift block.

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

8. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 7, characterized in that: A sliding groove is vertically provided on the rear inner wall of the box body; the rear end of the cross bar is slidably connected in the sliding groove; the upper surface of the cross bar is connected to the top wall of the box body through a tension spring.

9. The centralized dust removal system for a crawler mobile crushing and screening station according to claim 1, characterized in that: The centralized dust removal system also includes a jaw crusher feeder spray pipe, a jaw crusher main unit centralized dust collection hood, a cone upper hopper dust collection hood, a cone main unit centralized dust collection hood, a cone return screen dust collection hood, a screening upper hopper dust collection hood, a screening main unit dust collection hood and a screening finished product conveyor sealing hood. 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 upper 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 the centralized dust collector, which is an improved bag-type dust collector.

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