Energy-saving waste rock wool board crushing and screening integrated machine

Abstract

The application discloses an energy-saving waste rock wool board crushing and screening integrated machine, which comprises a crushing mechanism, a screening mechanism, a conveying mechanism, a fiber carding mechanism and a gas supply mechanism. The crushing mechanism comprises a shell one, and conveying crushing mechanisms one and two are oppositely arranged in the shell one. The conveying directions of the two mechanisms are opposite and have a linear velocity difference, and the waste rock wool board is differentially torn and crushed through tearing teeth. The screening mechanism comprises a material receiving shell and an impurity removing shell. A screening mechanism one for separating dust and fine fibers is arranged at the material receiving shell, and a screening mechanism two for separating heavy impurities is arranged at the impurity removing shell. The conveying mechanism is used for adsorbing and conveying the screened rock wool fibers, and the fiber carding mechanism is used for carding and outputting the rock wool fibers. Compared with the prior art, the application can improve the proportion of effective long fibers in the recovered materials and improve the resource utilization value of the waste rock wool board.

Description

Technical Field

[0001] This invention belongs to the field of solid waste treatment technology, specifically relating to an energy-saving integrated crushing and screening machine for waste rock wool boards. Background Technology

[0002] Rock wool is a widely used insulation and fireproofing material in the construction and industrial fields. It is usually made by melting natural minerals such as basalt and diabase at high temperatures, centrifuging them into fibers, and then adding binders for curing. With the large-scale use of rock wool products, the recycling and reuse of construction scraps, demolition waste, and old rock wool products has gradually become an issue of concern in the industry.

[0003] Existing waste rock wool recycling processes mostly employ methods such as crushing, opening, and screening to separate impurities from the rock wool fibers, ultimately obtaining crushed recycled rock wool fibers. However, while removing impurities, these processing methods subject the rock wool fibers to strong shearing, impact, and rubbing forces. For rock wool fibers that have already undergone high-temperature melting into fibers, thermal processing, and long-term aging, these mechanical actions can easily cause severe secondary damage.

[0004] A large amount of rock wool fibers that originally still had some length and reuse value were further broken into short fibers or powder during forced crushing and screening, resulting in a low proportion of effective long fibers in the final recycled material. Due to the insufficient long fiber content, recycled rock wool fibers cannot meet the requirements of recycled products with high strength, good web formation and structural stability, and can only be downgraded for use in low-end fillers or blended materials, thus having limited resource utilization value.

[0005] It is evident that if fiber breakage cannot be reduced and the recovery rate of effective long fibers cannot be increased during the impurity separation process, the large-scale recycling of waste rock wool will be difficult to escape the application path of low-end filling and low-price blending, which will not only limit the economic benefits of recycling companies, but also weaken the practical significance of the recycling of rock wool materials.

[0006] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide an energy-saving integrated crushing and screening machine for waste rock wool boards. Summary of the Invention

[0007] The purpose of this invention is to provide an energy-saving integrated crushing and screening machine for waste rock wool boards, which can solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: An energy-saving integrated crushing and screening machine for waste rock wool boards includes a crushing mechanism and a screening mechanism. The crushing mechanism includes a housing, inside which are installed a first conveying crushing mechanism and a second conveying crushing mechanism. The first conveying crushing mechanism is located below the second conveying crushing mechanism, and the gap between the first and second conveying crushing mechanisms gradually decreases. The conveying directions of the first and second conveying crushing mechanisms are opposite, and the conveying speed of the first conveying crushing mechanism is greater than that of the second conveying crushing mechanism. Both the first and second conveying crushing mechanisms are fixedly connected to [equipment / devices / facilities]. The tearing teeth are used to tear waste rock wool boards; the screening mechanism includes a receiving shell and a removal shell. The receiving shell has a receiving cavity, and the output ends of the first conveying and crushing mechanism and the second conveying and crushing mechanism are located in the receiving cavity. The lower end of the receiving shell has a conveying channel matching the receiving cavity. The removal shell has a removal channel matching the first conveying channel. The receiving shell is equipped with a screening mechanism matching the first conveying channel. The removal shell is equipped with a screening mechanism matching the removal channel. The removal shell is equipped with a screening mechanism matching the removal channel. The top of the removal shell is equipped with a conveying mechanism matching the removal channel.

[0009] In one or more embodiments of the present invention, an exhaust end is fixedly connected to the upper end of the housing, and the exhaust end is connected to the air supply mechanism. The exhaust end is used to draw in and recover the dust generated by the conveying crushing mechanism 1 and the conveying crushing mechanism 2 when tearing the rock wool board.

[0010] In one or more embodiments of the present invention, the screening mechanism includes an air supply end and an exhaust end. The air supply end is disposed on one side of the material conveying channel, and the exhaust end is disposed on the other side of the material conveying channel opposite to the air supply end, and the exhaust end is located above the air supply end. The air supply end is used to spray airflow into the material conveying channel to disperse fine fibers and dust in the falling material. The exhaust end is used to generate negative pressure to suck up and recover the dispersed fine fibers and dust.

[0011] In one or more embodiments of the present invention, the screening mechanism two includes an air supply end two, which is installed at the bottom of the impurity removal channel. A screw conveyor is fixedly connected inside the impurity removal housing, and the screw conveyor is located above the air supply end two. A guide plate is installed between the screw conveyor and the side wall of the impurity removal channel. The air supply end two is used to blow airflow from bottom to top, so that impurities with a density greater than rock wool fiber fall into the screw conveyor through the guide plate, and the screw conveyor outputs the impurities.

[0012] In one or more embodiments of the present invention, the material conveying mechanism includes a material conveying housing, inside which a second conveying mechanism is installed. The second conveying mechanism includes a third idler roller rotatably connected inside the material conveying housing, and a third conveyor belt mounted on the third idler roller. The third conveyor belt has a plurality of evenly distributed screen holes. The material conveying housing is equipped with an exhaust end third that matches the impurity removal channel. The exhaust end third is connected to an air supply mechanism.

[0013] In one or more embodiments of the present invention, the cross-section of the screen hole is an inverted cone shape, and the aperture of the air inlet surface of the screen hole is smaller than the aperture of the air outlet surface; a plurality of uniformly distributed elastic baffles are fixedly connected to the conveyor belt three, and the elastic baffles are in contact with the outer wall of the conveyor housing to form an isolation between the exhaust end three and the impurity removal channel, so as to limit the negative pressure suction force generated by the exhaust end three to the corresponding area of ​​the impurity removal channel.

[0014] In one or more embodiments of the present invention, an electromagnetic block matching the impurity removal channel is fixedly connected inside the impurity removal housing. The electromagnetic block is used to adsorb ferromagnetic impurities in the material flowing through the impurity removal channel.

[0015] In one or more embodiments of the present invention, a fiber combing mechanism matching the feeding mechanism is further included, the fiber combing mechanism being used to receive and comb the rock wool fibers output by the feeding mechanism.

[0016] In one or more embodiments of the present invention, the fiber combing mechanism includes a housing, a feeding roller, a cylinder, and a cover plate; a storage cavity is formed inside the housing; the feeding roller is rotatably connected to the housing and located at the outlet of the storage cavity, for quantitatively conveying the fibers in the storage cavity to the subsequent combing area; the cylinder is rotatably connected to the housing and located downstream of the feeding roller, for receiving and combing the fibers conveyed by the feeding roller; the cover plate is located inside the housing and arranged circumferentially along the cylinder, forming a combing area between the cover plate and the surface of the cylinder; a stripping roller is also rotatably connected inside the housing, located on one side of the cylinder, for stripping the combed fiber layer from the cylinder surface; a discharge conveyor belt is provided below or on one side of the housing for receiving and outputting the stripped fibers.

[0017] In one or more embodiments of the present invention, the housing 2 is further provided with a plurality of dust removal and exhaust ends that are connected to the combing area. The dust removal and exhaust ends are connected to the air supply mechanism and are used to suck up short fibers and dust generated during the combing process.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: The waste rock wool board is crushed using a differential speed tearing method, allowing it to gradually loosen under relatively gentle pulling and peeling action, rather than being forcibly crushed through high-speed shearing, hammering, or strong kneading. This significantly reduces the cutting and damage to the rock wool fibers during the crushing process, preserving as many long fibers as possible that still have some length and reuse value, thereby greatly increasing the proportion of effective long fibers in the recycled material. Due to the reduced generation of short fibers and powder, and the increased retention rate of long fibers, the recycled rock wool fibers have better web-forming properties, structural stability, and adaptability to subsequent processing. They are no longer limited to low-end fillers or simple blends, but are more suitable for preparing higher value-added recycled insulation materials, composite materials, or other recycled rock wool products, thus enhancing the resource utilization value of waste rock wool. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an energy-saving integrated crushing and screening machine for waste rock wool boards according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of an energy-saving integrated crushing and screening machine for waste rock wool boards according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a cross-sectional view of the crushing mechanism in one embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 This is a cross-sectional view of a screening mechanism in one embodiment of the present invention; Figure 6 This is a partial structural schematic diagram of conveyor belt one and conveyor belt two in one embodiment of the present invention; Figure 7 This is a schematic diagram of the screening mechanism and fiber combing mechanism in one embodiment of the present invention; Figure 8 This is a cross-sectional view of the material conveying mechanism in one embodiment of the present invention; Figure 9 This is a cross-sectional view of a fiber combing mechanism in one embodiment of the present invention.

[0021] Explanation of key figure labels: 1. Crushing mechanism; 2. Support leg; 3. Housing 1; 4. Conveying mechanism 1; 5. Exhaust end 1; 6. Conveying and crushing mechanism 1; 7. Idler roller 1; 8. Conveyor belt 1; 9. Conveying and crushing mechanism 2; 10. Idler roller 2; 11. Conveyor belt 2; 12. Motor; 13. Belt pulley 1; 14. Belt pulley 2; 15. Drive belt 1; 16. Belt pulley 3; 17. Belt pulley 4; 18. Drive belt 2; 19. Gear 1; 20. Gear 2; 21. Screening mechanism; 22. Receiving housing; 2201. Receiving chamber; 2202. Conveying channel 1; 23. Air supply end 1; 24. Exhaust end 2; 25. Impurity removal housing; 2501. Impurity removal channel; 26. Air supply end 2; 27. Screw conveyor; 28. Guide plate; 29. ​​Electromagnetic block; 31. Tearing tooth; 32. Solenoid valve 1; 33. Conveying mechanism; 34. 35. Conveying housing; 36. Conveying mechanism II; 37. Idler roller III; 38. Conveyor belt III; 39. Screen opening; 40. Elastic baffle; 41. Exhaust end III; 42. Screen cleaning mechanism; 43. Back-blowing exhaust end; 44. Discharge end; 45. Exhaust end IV; 46. Fiber combing mechanism; 47. Housing II; 48. Storage chamber; 49. Feeding roller; 40. Cylinder; 41. Cover plate; 42. Dust collector 50. Exhaust end; 51. Stripping roller; 52. Discharge conveyor belt; 53. Connecting pipe one; 54. Connecting pipe two; 55. Three-way valve; 56. Solenoid valve two; 57. Air supply mechanism; 58. Diverter box one; 59. Solenoid valve three; 60. Connecting pipe three; 61. Dust removal mechanism; 62. Connecting pipe five; 63. Air pump; 64. Connecting pipe six; 65. Diverter box two; 66. Connecting pipe seven. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0023] An energy-saving integrated crushing and screening machine for waste rock wool boards, as described in one embodiment of the present invention, is used for the resource-based treatment of construction scraps, demolished waste rock wool boards, and old rock wool products. It tears the waste rock wool boards into rock wool fibers under conditions of low mechanical damage, separates short fibers and impurities, and recovers long fibers, thereby increasing the proportion of effective long fibers. This effectively improves the situation where traditional crushing processes can only produce short fibers, and achieves the retention of long fibers in old rock wool boards.

[0024] like Figures 1-4As shown, the energy-saving waste rock wool board crushing and screening integrated machine includes a crushing mechanism 1 and a screening mechanism 21. The crushing mechanism 1 is used to tear and crush the waste rock wool board, and the screening mechanism 21 is used to classify and separate the crushed rock wool fibers, dust, and impurities. The crushing mechanism 1 and the screening mechanism 21 are continuously connected, so that the waste rock wool board can directly enter the screening area after being torn and crushed, reducing intermediate transfer links and reducing material dust and energy loss.

[0025] like Figures 1-6 As shown, the crushing mechanism 1 includes a housing 3, with a support leg 2 installed below the housing 3 to support the housing 3. A feeding port is provided on one side of the housing 3, and a discharge port is provided at the end of the housing 3 away from the feeding port. A conveying mechanism 4 is installed at a position on the housing 3 that matches the feeding port, and the conveying mechanism 4 is used to convey waste rock wool boards into the housing 3.

[0026] Among them, the support leg 2 supports the support shell 3 at an angle, so that the height of the feeding port is much lower than the height of the discharge port, so that the waste rock wool board is crushed and enters the screening mechanism 21 from above.

[0027] The housing 3 is equipped with a conveying and crushing mechanism 6 and a conveying and crushing mechanism 9. The conveying and crushing mechanism 6 is located below the conveying and crushing mechanism 9, and the conveying mechanism 4 is located in front of the conveying and crushing mechanisms 6 and 9. The conveying mechanism 4 conveys the rock wool board placed in the feeding port to the space between the conveying and crushing mechanisms 6 and 9. The conveying and crushing mechanisms 6 and 9 tear and crush the rock wool board and convey the torn and crushed rock wool fibers backward.

[0028] The conveying crushing mechanism 6 and the conveying crushing mechanism 9 operate in opposite directions, with the conveying speed of the first conveying crushing mechanism 6 being greater than that of the second conveying crushing mechanism 9. Both mechanisms are equipped with multiple evenly distributed tearing teeth 31. This means that a speed difference is created on the adjacent working surfaces of the two mechanisms. After being conveyed by these mechanisms, the waste rock wool board is subjected to differential traction, and the tearing teeth 31 continuously pull and peel the rock wool board. The differential tearing structure formed by the two mechanisms enhances the opening effect of the rock wool board and propels the material towards the discharge end, thus combining crushing and conveying functions. Since it eliminates the need for additional high-energy-consuming high-speed crushing discs or hammer rotors, the overall energy consumption is lower, meeting the design requirements for energy-saving equipment.

[0029] Specifically, the tearing teeth 31 are used to insert into or hook the fiber layers of the waste rock wool board, and tear the waste rock wool board during the relative movement of the conveying crushing mechanism 6 and the conveying crushing mechanism 9. Compared with traditional blade shearing crushing, hammer crushing, or high-speed friction crushing, the traction tearing method allows the rock wool board to gradually separate along the weaker bonding between fiber layers, reducing the strong shearing and impact on the rock wool fiber body, thereby preserving as many long rock wool fibers as possible. This can significantly increase the proportion of effective long fibers in recycled rock wool fibers, making the recycled fibers more suitable for use in recycled rock wool products, composite insulation materials, or other materials with web formation and reinforcement requirements.

[0030] like Figures 3-4 As shown, the conveying and crushing mechanism 6 includes multiple idlers 7 and a conveyor belt 8 mounted on the multiple idlers 7, with the multiple idlers 7 installed inside the housing 3. The conveying and crushing mechanism 9 includes multiple idlers 10 and a conveyor belt 11 mounted on the multiple idlers 10, with the multiple idlers 10 also installed inside the housing 3, and the conveyor belt 11 located above the conveyor belt 8.

[0031] like Figure 6 As shown, multiple tearing teeth 31 are respectively installed on conveyor belt 8 and conveyor belt 11.

[0032] A working gap is formed between conveying crushing mechanism 6 and conveying crushing mechanism 9 to clamp and tear waste rock wool boards. This working gap gradually decreases along the material conveying direction. Specifically, the closer to the discharge port, the closer the distance between idler roller 10 and idler roller 7 becomes, making the gap between conveyor belt 11 and conveyor belt 8 smaller and smaller. After the waste rock wool boards enter this working gap, they are initially clamped and torn at the larger gap, and then gradually thinned and torn apart as the material moves towards the discharge end. This gradual tearing method avoids the large-scale fiber breakage caused by one-time strong pressure, while gradually loosening the rock wool boards and improving the efficiency of subsequent airflow screening and impurity removal.

[0033] like Figure 4 As shown, a motor 12 is mounted on the upper end of housing 13, and a pulley 13 is fixedly connected to the output shaft of the motor 12. A pulley 14 and a pulley 16 are fixedly connected to one of the rollers 10 closest to the motor 12, and a drive belt 15 is installed between pulley 13 and pulley 14. A pulley 17 is fixedly connected to another roller 10 adjacent to the roller 10 with pulley 14, and a drive belt 18 is installed between pulley 17 and pulley 16. A gear 19 is also mounted on the roller 10 with pulley 17, and a gear 20 matching gear 19 is mounted on one of the rollers 7, with gear 19 meshing with gear 20.

[0034] During operation, motor 12 drives the corresponding idler roller 10 to rotate via pulley 13, pulley 14, and drive belt 15. Then, via pulley 16, pulley 17, and drive belt 18, it drives another idler roller 10 to rotate, ensuring the stable operation of conveyor belt 11. Simultaneously, gear 19 meshes with gear 20, driving idler roller 7 to rotate, causing conveyor belt 8 and conveyor belt 11 to move in opposite directions.

[0035] Because the outer diameter of gear 19 is larger than that of gear 20, and the rotational speed of gear 20 is higher than that of gear 19, the running speed of idler roller 7 and conveyor belt 8 is greater than that of idler roller 20 and conveyor belt 21. A single motor 12 can simultaneously drive both sets of upper and lower conveying and crushing mechanisms, and the speed difference is naturally formed through the transmission ratio, reducing the number of drive motors and the complexity of the control system, thereby lowering equipment manufacturing costs, operating energy consumption, and maintenance costs.

[0036] In addition to belt drive, this invention can also employ chain and sprocket drive or dual-motor independent drive. For example, using chain and sprocket drive reduces the impact of belt slippage on the stability of the transmission speed ratio, making the speed difference between conveyor belt 8 and conveyor belt 11 more stable. Using dual-motor independent drive allows for separate control of the running speed and direction of conveyor belt 8 and conveyor belt 11, further avoiding speed difference fluctuations caused by slippage of transmission components, and facilitating the adjustment of tear strength according to different thicknesses, densities, or aging degrees of waste rock wool boards.

[0037] It should be noted that conveyor belt 8 conveys materials towards the discharge end, while conveyor belt 11 conveys materials towards the feed end, and the conveying speed of conveyor belt 8 is greater than that of conveyor belt 11. Therefore, when waste rock wool boards enter between conveyor belt 8 and conveyor belt 11, the rock wool boards are subjected to the reverse traction and differential pulling action of the tearing teeth 31 on both sides, thus being gradually torn, loosened, and pushed towards the discharge end, achieving low-damage tearing and crushing of the waste rock wool boards.

[0038] Because rock wool boards easily generate fine fibers and dust during the tearing process, direct spillage would pollute the working environment and affect the health of operators. Therefore, an exhaust end 5 is fixedly connected to the upper end of the housing 3, and the exhaust end 5 is connected to the air supply mechanism 56. The exhaust end 5 is used to suck up the dust, short fibers, and free fibers generated by the conveying crushing mechanism 6 and the conveying crushing mechanism 9 when tearing waste rock wool boards, reducing the dust diffusion path and lowering the subsequent dust removal load.

[0039] like Figure 5As shown, the screening mechanism 21 includes a receiving shell 22 and a removal shell 25. A receiving cavity 2201 is provided inside the receiving shell 22, and the output ends of the conveying crushing mechanism 6 and the conveying crushing mechanism 9 are located inside the receiving cavity 2201. A conveying channel 2202 matching the receiving cavity 2201 is provided at the lower end of the receiving shell 22. After the rock wool fibers, dust, and impurities are torn by the crushing mechanism 1, they enter the receiving cavity 2201 and then enter the conveying channel 2202 under gravity.

[0040] It is worth noting that, in order to ensure that the torn rock wool fibers can smoothly detach from conveying and crushing mechanism 16 and conveying and crushing mechanism 29 and enter the receiving chamber 2201, the discharge end of conveying and crushing mechanism 29 extends towards the receiving chamber 2201 relative to the discharge end of conveying and crushing mechanism 16. That is, the farthest end of conveying and crushing mechanism 29 is longer than that of conveying and crushing mechanism 16. This arrangement allows the rock wool fibers, after being torn by conveyor belt 18 and conveyor belt 211, to tend to fall or be guided towards the receiving chamber 2201 at the discharge end, reducing the likelihood of fibers falling back onto conveying and crushing mechanism 16.

[0041] Preferably, the receiving housing 22 is further equipped with comb plates that match the conveying crushing mechanism 6 and the conveying crushing mechanism 9. The comb plates can be respectively located near the discharge end of the conveying crushing mechanism 6 and the discharge end of the conveying crushing mechanism 9, and are located on the inlet side of the receiving chamber 2201. The comb plate matching the conveying crushing mechanism 6 is located near the outer surface of the discharge end of the conveyor belt 8, and the comb plate matching the conveying crushing mechanism 9 is located near the outer surface of the discharge end of the conveyor belt 11. The comb teeth on the comb plates extend toward the corresponding conveyor belt surface and extend into the gap between adjacent tearing teeth 31, or maintain a small gap with the movement trajectory of the tearing teeth 31, so as to peel off the rock wool fibers attached to the conveyor belt 8, the conveyor belt 11, and the tearing teeth 31 without interfering with the normal rotation of the conveyor belt.

[0042] During operation, after the waste rock wool board is differentially torn by the conveying crushing mechanism 6 and the conveying crushing mechanism 9, some rock wool fibers will become entangled or attached to the tearing teeth 31 and the surface of the conveyor belt. When the conveyor belts 8 and 11 continue to run to the discharge end, the attached rock wool fibers move to the comb plate with the corresponding conveyor belt. At this time, the comb teeth of the comb plate block and scrape the rock wool fibers, causing the fibers entangled on the tearing teeth 31 to be combed off and swept off, and fall into the receiving chamber 2201 under the combined action of gravity and material inertia. This avoids the rock wool fibers from entering the interior of the housing 3 with the conveyor belt, reduces the risk of material circulation retention and blockage, and improves the continuity and stability of the transfer of crushed rock wool fibers to the screening mechanism 21.

[0043] like Figure 5As shown, the impurity removal shell 25 is located below the receiving shell 22 or on the discharge side. The impurity removal shell 25 has an impurity removal channel 2501 that matches the conveying channel 2202. The conveying channel 2202 communicates with the impurity removal channel 2501, allowing material to continuously enter the impurity removal shell 25 from the receiving shell 22. A screening mechanism 1 matching the conveying channel 2202 is installed on the receiving shell 22, and a screening mechanism 2 matching the impurity removal channel 2501 is installed inside the impurity removal shell 25. The screening mechanism 1 is used for airflow separation of dust and fine fibers in the falling material, while the screening mechanism 2 is used to separate heavy impurities with a density greater than that of rock wool fibers. Through two-stage airflow screening, impurity separation can be completed with less mechanical contact, avoiding repeated impacts and breakage of the rock wool fibers caused by traditional vibrating screens and drum screens.

[0044] After being torn and crushed by the conveying crushing mechanism 6 and the conveying crushing mechanism 9, the material directly enters the receiving chamber 2201, the conveying channel 2202, and the impurity removal channel 2501 from top to bottom, and undergoes airflow screening during its descent. In other words, material transfer is mainly achieved through the end-conveying of the conveyor belt, the material's own gravity, and the directional guidance of the airflow, eliminating the need for additional high-power elevators, screw conveyors, or multi-stage transfer equipment between the crushing mechanism 1 and the screening mechanism 21. This significantly shortens the material conveying path, reduces fiber entanglement, blockage, and dust spillage caused by intermediate transfers, thereby significantly reducing the driving energy consumption required for material conveying.

[0045] like Figure 5 As shown, the screening mechanism includes an air supply end 23 and an exhaust end 24. The air supply end 23 is located on one side of the conveying channel 2202, and the exhaust end 24 is located on the opposite side of the conveying channel 2202, above the air supply end 23. The air supply end 23 is used to spray airflow into the conveying channel 2202 to disperse fine fibers and dust in the falling material; the exhaust end 24 is used to generate negative pressure in the conveying channel 2202 to suck up and recover the dispersed fine fibers and dust.

[0046] As the material falls through the conveying channel 2202, the air supply end 23 generates a horizontal or upward-sloping airflow, causing lighter dust, short fibers, and fine fibers to separate from heavier materials. The exhaust end 24 creates a negative pressure suction on the opposite side, causing the light dust and short fibers to be directionally carried away. Because the exhaust end 24 is higher than the air supply end 23, the airflow forms an upward-trending sorting path within the conveying channel 2202, making it easier for light materials to be carried upwards by the airflow, reducing the probability of longer rock wool fibers being directly sucked away, thereby reducing the loss of valuable long fibers.

[0047] The screening mechanism 2 includes an air supply end 26, which is installed at the bottom of the impurity removal channel 2501. A screw conveyor 27 is fixedly connected inside the impurity removal housing 25. The screw conveyor 27 is located above the air supply end 26. A guide plate 28 is installed between the screw conveyor 27 and the side wall of the impurity removal channel 2501. An air supply hole is opened on the guide plate 28.

[0048] After the material enters the impurity removal channel 2501, the air supply end 26 blows air upwards. The airflow enters the impurity removal channel 2501 through the air supply holes on the guide plate 28 and acts on the material. Because rock wool fibers have a low density and a large specific surface area, they are easily lifted by the rising airflow and continue to move to the subsequent conveying area. However, heavy impurities such as sand, gravel, mortar blocks, and small metal particles, which have a density greater than rock wool fibers, are difficult to be lifted by the rising airflow and fall along the guide plate 28 under their own gravity and enter the screw conveyor 27. The guide plate 28 serves two purposes: firstly, it receives and guides heavy impurities, allowing them to smoothly flow into the screw conveyor 27; secondly, the air supply holes allow the rising airflow generated by the air supply end 26 to pass through evenly, thus forming a relatively stable rising and separating airflow within the impurity removal channel 2501. The screw conveyor 27 continuously or intermittently transports and discharges the collected heavy impurities, thereby significantly reducing the content of hard impurities in the rock wool fiber. The entire impurity removal process mainly relies on airflow sorting and gravity settling to reduce secondary damage to the rock wool fiber caused by mechanical impact.

[0049] like Figure 7 As shown, a solenoid valve 32 is installed at the outlet end of the screw conveyor 27. The solenoid valve 32 is used to seal the outlet of the screw conveyor 27 when not discharging material, preventing airflow, dust, and fiber lint from leaking out of the outlet of the screw conveyor 27 from the impurity removal channel 2501. When heavy impurities need to be discharged, the solenoid valve 32 opens, allowing the impurities to be discharged; when no discharge is required, the solenoid valve 32 closes, thereby ensuring a stable airflow field inside the impurity removal housing 25.

[0050] like Figure 5 As shown, an electromagnetic block 29, matching the impurity removal channel 2501, is also fixedly connected inside the impurity removal housing 25. The electromagnetic block 29 is used to adsorb ferromagnetic impurities in the material flowing through the impurity removal channel 2501. Waste rock wool boards may contain iron nails, iron filings, steel wires, or construction metal fragments. By setting the electromagnetic block 29, ferromagnetic impurities can be adsorbed simultaneously during the airflow separation process, reducing the entry of metal fragments into the subsequent conveying mechanism 33 and fiber combing mechanism 44, reducing equipment wear and clogging risks, and improving the cleanliness of recycled rock wool fibers.

[0051] When the metal impurities adsorbed on the surface of the electromagnetic block 29 accumulate to a certain amount, the electromagnetic block 29 can be cleaned and maintained online. Specifically, first stop the air supply from the second air supply end 26, then de-energize the electromagnetic block 29 to make its magnetism disappear. The metal debris adsorbed on it falls into the screw conveyor 27 below under the action of gravity. After the screw conveyor 27 conveys and discharges the metal debris, the electromagnetic block 29 is energized again to restore its magnetism. Then, the second air supply end 26 is restarted to resume air supply, thus completing the cleaning and maintenance of the electromagnetic block 29 without stopping the machine for disassembly.

[0052] like Figures 7-8 As shown, a conveying mechanism 33 matching the impurity removal channel 25 is installed at the top of the impurity removal housing 25. The conveying mechanism 33 is used to receive the rock wool fibers after airflow screening in the impurity removal channel 2501 and convey the rock wool fibers to the subsequent area. The conveying mechanism 33 includes a conveying housing 34, and a conveying mechanism 35 is installed inside the conveying housing 34. The conveying mechanism 35 includes a roller 36 rotatably connected inside the conveying housing 34 and a conveyor belt 37 installed on the roller 36. The conveyor belt 37 has a plurality of evenly distributed screen holes 3701. An exhaust end 39 matching the impurity removal channel 2501 is installed on the conveying housing 34, and the exhaust end 39 is connected to the air supply mechanism 56.

[0053] When the material conveying mechanism 33 is working, the air supply end 26 lifts the rock wool fibers upwards to the vicinity of the conveyor belt 37, and the exhaust end 39 generates negative pressure above or in the corresponding area of ​​the conveyor belt 37, causing the rock wool fibers to be adsorbed onto the surface of the conveyor belt 37. The conveyor belt 37 then carries the rock wool fibers away from the impurity removal channel 2501, achieving flexible fiber capture and continuous conveying without the need for mechanical scrapers or forced compression, thus reducing the risk of the rock wool fibers being broken again.

[0054] The cross-section of the sieve hole 3701 is an inverted cone shape, and the diameter of the inlet surface of the sieve hole 3701 is smaller than the diameter of the outlet surface. When the exhaust end 39 is drawing in air, the airflow can pass through the sieve hole 3701 to form a stable negative pressure, causing the rock wool fibers to adhere to the surface of the conveyor belt 37. Because the sieve hole 3701 has an inverted cone structure with a small inlet and a large outlet, dust and fine particles are not easily stuck in the hole wall when passing through the sieve hole 3701, which can reduce the probability of clogging of the sieve hole 3701.

[0055] Multiple evenly distributed elastic baffles 38 are fixedly connected to the conveyor belt 37. These baffles 38 contact the outer wall of the conveyor housing 34, forming an isolation between the exhaust end 39 and the impurity removal channel 2501. This confines the negative pressure suction generated by the exhaust end 39 to the corresponding area of ​​the impurity removal channel 2501. Through the partitioning effect of the elastic baffles 38, the exhaust end 39 does not need to continuously suction the entire interior of the conveyor housing 34; it only needs to generate suction on the localized area receiving rock wool fibers. This reduces ineffective airflow and stabilizes the fiber adsorption position.

[0056] A screen cleaning mechanism 40 is provided inside the conveying mechanism 33. The screen cleaning mechanism 40 includes a back-blowing exhaust end 41 and a discharge end 42, which are interconnected. A solenoid valve for adjusting the flow rate can be installed between the back-blowing exhaust end 41 and the discharge end 42. The back-blowing exhaust end 41 is used to back-blow towards the screen holes 3701 on the conveyor belt 37, and the discharge end 42 is used to blow a small amount of airflow towards the subsequent storage chamber 4501, so that the rock wool fibers attached to the conveyor belt 37 can be quickly detached and enter the subsequent area.

[0057] The conveyor housing 34 is also equipped with an exhaust end 43, which corresponds to the back-blowing exhaust end 41. The back-blowing exhaust end 41 blows air towards the large-aperture end of the screen hole 3701, causing the airflow to flow from the large-aperture end to the small-aperture end of the screen hole 3701, thereby blowing out dust, short fibers, and fine particles that are blocked or attached to the screen hole 3701, achieving online cleaning of the screen hole 3701. The air volume of the discharge end 42 is less than that of the back-blowing exhaust end 41. The discharge end 42 is mainly used to gently push the rock wool fibers attached to the surface of the conveyor belt 37 to detach without causing strong impact on the rock wool fibers. By having the back-blowing exhaust end 41 and the discharge end 42 respectively undertake the functions of cleaning holes and assisting in material discharge, the permeability of the conveyor belt 37 can be ensured while avoiding excessive airflow impact on the fibers.

[0058] like Figures 7-9 As shown, the conveying mechanism 33 transports rock wool fibers to the fiber combing mechanism 44, which includes a housing 45, a feed roller 46, a cylinder 47, and a cover plate 48. A storage chamber 4501 is located inside the housing 45 and is used to temporarily receive the rock wool fibers transported by the conveying mechanism 33. The feed roller 46 is rotatably connected to the housing 45 and is located at the outlet of the storage chamber 4501. The cylinder 47 is rotatably connected to the housing 45 and is located downstream of the feed roller 46, used to receive and comb the fibers transported by the feed roller 46. The cover plate 48 is located inside the housing 45 and is arranged circumferentially along the cylinder 47, forming a combing zone between the surface of the cover plate 48 and the surface of the cylinder 47.

[0059] The conveying mechanism 33 feeds the purified rock wool fibers into the storage chamber 4501. The feed roller 46 feeds the fibers in the storage chamber 4501 towards the cylinder 47 at a stable speed, preventing the fibers from entering the carding zone in large quantities at once and causing accumulation. The cylinder 47 drives the rock wool fibers to move along its surface, and the cover plate 48 and the cylinder 47 form a relative carding action, which further opens, straightens, and evenly spreads the fiber bundles. Compared with traditional methods of re-crushing or strong agitation to open the fibers, the effect of the cylinder 47 and the cover plate 48 on the fibers is more focused on carding and dispersing, which can reduce the fiber breakage rate, improve the uniformity of the fiber layer, and facilitate subsequent reuse.

[0060] A stripping roller 50 is rotatably connected inside the housing 45. The stripping roller 50 is positioned on one side of the cylinder 47 and is used to peel off the combed fiber layer from the surface of the cylinder 47. A discharge conveyor belt 51 is located below or on one side of the housing 45. The discharge conveyor belt 51 is installed below the stripping roller 50 and is used to receive and output the stripped fibers. The stripping roller 50 continuously peels off the fiber layer from the surface of the cylinder 47, allowing the fibers to fall onto the discharge conveyor belt 51 in a relatively uniform manner. The discharge conveyor belt 51 then transports the processed recycled rock wool fibers to a collection or subsequent molding process.

[0061] The housing 45 also contains several dust removal and exhaust ends 49 connected to the carding zone, and these ends are connected to the air supply mechanism 56. The dust removal and exhaust ends 49 are used to extract short fibers and dust generated during the fiber carding process. Because the carding zone further opens up the fiber bundles, the fine dust and short fibers trapped within are easily released. In this embodiment, the dust removal and exhaust ends 49 create a directional negative pressure near the carding zone, which can promptly remove the released dust, resulting in cleaner rock wool fibers and reducing dust accumulation inside the housing 45 and external environmental pollution.

[0062] like Figures 1-2 As shown, the air supply mechanism 56 includes a distribution box 57, a dust removal mechanism 61, and an air pump 63. Exhaust ends 24, 5, 39, 49, and 43 are all connected to the distribution box 57 via connecting pipe 59. A solenoid valve 58 for adjusting the flow rate is installed on the distribution box 57. A connecting pipe 60 connects the distribution box 57 and the dust removal mechanism 61, and a connecting pipe 62 connects the dust removal mechanism 61 and the air pump 63. When the air pump 63 is working, a negative pressure is generated at exhaust ends 5, 24, 39, 43, and 49. The dust-laden airflow is first drawn into the distribution box 57, then through connecting pipe 60 into the dust removal mechanism 61 for dust removal, and finally through connecting pipe 62 into the air pump 63.

[0063] The exhaust end 43 is equipped with a connecting pipe 52, and the exhaust end 39 is equipped with a connecting pipe 53. A three-way valve 54 is installed at the outlet end of both connecting pipes 52 and 53, and a solenoid valve 55 is installed on both connecting pipes 52 and 53. The three-way valve 54 is connected to the diversion box 57 via the connecting pipe 39. By setting the connecting pipes 52 and 53, the three-way valve 54, and the solenoid valve 55, the suction state of the exhaust ends 39 and 43 can be switched or adjusted. For example, when the conveyor belt 37 needs to absorb rock wool fibers, the negative pressure of the exhaust end 39 can be increased; when the screen hole 3701 needs backflushing cleaning, the exhaust end 43 can be adjusted to work in coordination with the backflushing exhaust end 41. This avoids multiple exhaust ends operating at full load simultaneously, reducing the energy consumption of the air pump 63 while ensuring functional performance.

[0064] The air pump 63 has a connecting pipe 64 installed at its outlet. A diverter box 65 is fixedly connected to the end of the connecting pipe 64 furthest from the air pump 63. The diverter box 65 is connected to the air supply end 23, the air supply end 26, and the screen cleaning mechanism 40 via a connecting pipe 66. The air pump 63 provides negative pressure to the exhaust end and simultaneously re-feeds the dust-removed airflow to the air supply end 23, the air supply end 26, the back-blowing exhaust end 41, and the discharge end 42. In other words, the air supply mechanism 56 can form a circulating airflow that involves suction, dust removal, and re-supply. The airflow treated by the dust removal mechanism 61 is reused for air supply screening and back-blowing cleaning, reducing fresh air intake and exhaust losses, and improving airflow utilization.

[0065] The working process of the energy-saving waste rock wool board crushing and screening integrated machine is as follows: Waste rock wool boards are fed into the inlet and conveyed by conveyor mechanism 4 to the working gap between conveyor belt 8 and conveyor belt 11. The tearing teeth 31 on conveyor belts 8 and 11 act on the upper and lower surfaces of the rock wool boards, respectively. Because conveyor belts 8 and 11 move in opposite directions and their speed is greater than that of 11, the rock wool boards are subjected to differential traction and tearing action, gradually being torn, thinned, and moved towards the discharge end. As the working gap gradually decreases, the rock wool boards gradually change from a solid board state to a loose fiber state. Dust generated during the crushing process is drawn into the air supply mechanism 56 through exhaust end 5.

[0066] The torn material enters the receiving chamber 2201 within the receiving housing 22 and flows downward into the conveying channel 2202. Air supply end 23 sprays airflow into the conveying channel 2202, while exhaust end 24 generates negative pressure, carrying away dust, short fibers, and fine fibers from the material. Subsequently, the material enters the impurity removal channel 2501 within the impurity removal housing 25. Air supply end 26 blows airflow upwards, lifting the rock wool fibers, while denser impurities such as sand, mortar blocks, gravel, and metal particles fall through guide plate 28 into the screw conveyor 27, which then transports them to the outlet. When impurity removal is required, solenoid valve 32 opens; when impurity removal is not required, solenoid valve 32 closes to maintain stable airflow within the impurity removal channel 2501.

[0067] Rock wool fibers moving upward in the impurity removal channel 2501 are adsorbed onto the conveyor belt 37 by the negative pressure generated by the exhaust end 39. The conveyor belt 37, driven by the idler roller 36, transports the rock wool fibers to the storage chamber 4501. The back-blowing exhaust end 41 cleans the sieve holes 3701, while the discharge end 42 assists the rock wool fibers to detach from the conveyor belt 37 and enter the storage chamber 4501 with a small air volume. The rock wool fibers entering the storage chamber 4501 are quantitatively fed into the carding zone formed by the cylinder 47 and the cover plate 48 by the feed roller 46, where they form a relatively uniform fiber layer. The stripping roller 50 peels off the fiber layer from the surface of the cylinder 47, and the peeled fibers fall onto the discharge conveyor belt 51 and are output. Dust and short fibers generated during the carding process are sucked and recovered by the dust removal exhaust end 49.

[0068] In summary, compared with the prior art, the present invention has at least the following beneficial effects: Conveyor belt 8, conveyor belt 11, and tearing teeth 31 work together to form a differential speed tearing and crushing method, avoiding the waste rock wool board from being sheared, hammered, or broken by strong friction from high-speed blades. The rock wool board is torn in stages with gradually decreasing gaps, resulting in a low fiber breakage rate and obtaining more long fibers with reuse value.

[0069] By integrating crushing, dust extraction, airflow screening, heavy impurity separation, ferromagnetic impurity adsorption, fiber conveying, and fiber combing into the same equipment, the number of material transfers between different devices is reduced, dust and fiber loss are decreased, and the continuity and stability of waste rock wool board recycling and processing are improved.

[0070] The primary airflow separation is achieved through the air supply end 23 and the exhaust end 24, and the secondary airflow impurity removal is achieved through the air supply end 26, the guide plate 28 and the screw conveyor 27. This process can separate dust, short fibers and heavy impurities without relying on strong vibration screening, thus reducing the repeated impact of mechanical screening on rock wool fibers.

[0071] Electromagnetic block 29 adsorbs ferromagnetic impurities, which can reduce the risk of wear on components such as conveyor belt 37, cylinder 47, cover plate 48 and stripping roller 50 caused by metallic impurities, thereby improving equipment life and the cleanliness of recycled rock wool fibers.

[0072] The inverted conical screen holes 3701 on the conveyor belt 37, in conjunction with the exhaust end 39, enable flexible adsorption and conveying of fibers. The screen holes 3701 are cleaned online through the back-blowing exhaust end 41, which keeps the screen holes 3701 unobstructed for a long time, reduces the number of downtime cleanings, and improves continuous production capacity.

[0073] The negative pressure generated by the exhaust end 39 is limited to the corresponding area of ​​the impurity removal channel 2501 by the elastic baffle 38, thereby reducing the ineffective exhaust area and making the air energy output by the air pump 63 more concentrated and effective, thus reducing energy consumption.

[0074] The air supply mechanism 56 can purify the dust-laden airflow drawn from the exhaust end through the dust removal mechanism 61 and reuse it for the air supply end 1 23, air supply end 26, and the screen cleaning mechanism 40, thus realizing airflow recycling. This reduces the number of independent fans and the amount of fresh air intake, thereby reducing the overall installed power and operating power consumption.

[0075] The fiber combing mechanism 44 quantitatively feeds, combs, peels, and outputs the separated rock wool fibers, making the recycled fibers looser, more uniform, and cleaner. Compared to simply collecting the fibers directly after crushing, the output fibers have better subsequent web-forming properties, better blending uniformity, and greater structural stability of the recycled products, which is beneficial to improving the resource utilization value of waste rock wool.

[0076] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0077] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy-saving integrated crushing and screening machine for waste rock wool boards, comprising a crushing mechanism and a screening mechanism, characterized in that, The crushing mechanism includes a housing, inside which a first conveying crushing mechanism and a second conveying crushing mechanism are installed. The first conveying crushing mechanism is located below the second conveying crushing mechanism. The gap between the first conveying crushing mechanism and the second conveying crushing mechanism gradually decreases. The conveying directions of the first conveying crushing mechanism and the second conveying crushing mechanism are opposite. The conveying speed of the first conveying crushing mechanism is greater than the conveying speed of the second conveying crushing mechanism. Both the first conveying crushing mechanism and the second conveying crushing mechanism are fixedly connected with tearing teeth for tearing waste rock wool boards. The screening mechanism includes a receiving shell and a cleaning shell. The receiving shell has a receiving cavity. The output ends of the conveying and crushing mechanism one and the conveying and crushing mechanism two are located in the receiving cavity. The lower end of the receiving shell has a conveying channel one that matches the receiving cavity. The impurity removal shell is provided with an impurity removal channel that matches the first conveying channel. The receiving shell is equipped with a screening mechanism that matches the first conveying channel. The impurity removal shell is equipped with a screening mechanism that matches the second impurity removal channel. The top of the impurity removal housing is equipped with a material conveying mechanism that matches the impurity removal channel.

2. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 1, characterized in that, The upper end of the housing is fixedly connected to an exhaust end, which is connected to the air supply mechanism. The exhaust end is used to draw in and recover the dust generated by the conveying crushing mechanism 1 and the conveying crushing mechanism 2 when tearing the rock wool board.

3. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 1, characterized in that, The screening mechanism includes an air supply end and an exhaust end. The air supply end is located on one side of the material conveying channel, and the exhaust end is located on the other side of the material conveying channel opposite to the air supply end, with the exhaust end located above the air supply end. The first air supply end is used to spray airflow into the first material conveying channel to disperse fine fibers and dust in the falling material; the second exhaust end is used to generate negative pressure to suck up and recover the dispersed fine fibers and dust.

4. An energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 1 or 3, characterized in that, The second screening mechanism includes a second air supply end, which is installed at the bottom of the impurity removal channel. A screw conveyor is fixedly connected inside the impurity removal housing and is located above the second air supply end. A guide plate is installed between the screw conveyor and the side wall of the impurity removal channel. The second air supply end is used to blow airflow from bottom to top, so that impurities with a density greater than rock wool fiber fall into the screw conveyor through the guide plate and are output by the screw conveyor.

5. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 4, characterized in that, The material conveying mechanism includes a material conveying housing, inside which a second conveying mechanism is installed. The second conveying mechanism includes a roller three rotatably connected inside the material conveying housing, and a conveyor belt three installed on the roller three. The conveyor belt three has multiple evenly distributed screen holes. The material conveying housing is equipped with an exhaust end three that matches the impurity removal channel. The exhaust end three is connected to the air supply mechanism.

6. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 5, characterized in that, The cross-section of the sieve hole is an inverted cone shape, and the diameter of the air inlet surface of the sieve hole is smaller than the diameter of the air outlet surface; Multiple evenly distributed elastic baffles are fixedly connected to the conveyor belt three. The elastic baffles are in contact with the outer wall of the conveyor housing and are used to form an isolation between the exhaust end three and the impurity removal channel, so as to limit the negative pressure suction force generated by the exhaust end three to the corresponding area of ​​the impurity removal channel.

7. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 4, characterized in that, An electromagnetic block matching the impurity removal channel is fixedly connected inside the impurity removal shell. The electromagnetic block is used to adsorb ferromagnetic impurities in the material flowing through the impurity removal channel.

8. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 1, characterized in that, It also includes a fiber combing mechanism that matches the feeding mechanism, the fiber combing mechanism being used to receive and comb the rock wool fibers output by the feeding mechanism.

9. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 8, characterized in that, The fiber combing mechanism includes a housing, a feeding roller, a cylinder, and a cover plate; The interior of the second housing has a storage cavity; the feed roller is rotatably connected to the second housing and located at the outlet of the storage cavity, used to quantitatively transport the fibers in the storage cavity to the subsequent carding area; the cylinder is rotatably connected to the second housing and located downstream of the feed roller, used to receive and card the fibers transported by the feed roller; the cover plate is located inside the second housing and arranged circumferentially along the cylinder, and a carding area is formed between the cover plate and the surface of the cylinder; The housing 2 is also rotatably connected to a stripping roller, which is located on one side of the cylinder and is used to peel off the combed fiber layer on the surface of the cylinder. The lower part or one side of the housing is provided with a discharge conveyor belt for receiving and outputting the stripped fibers.

10. The energy-saving integrated crushing and screening machine for waste rock wool boards according to claim 9, characterized in that, The second housing is also equipped with several dust removal and exhaust ends that are connected to the combing area. The dust removal and exhaust ends are connected to the air supply mechanism and are used to suck up the short fibers and dust generated during the combing process.

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