Air curtain variable flow type consumption reduction and dust suppression device and method

Abstract

The invention provides an air curtain variable flow type consumption reduction and dust suppression device and method, relates to the field of dust suppression equipment, and aims to solve the problem that materials are flapped out of a stock bin in the process of turning over and pouring materials of a movable box turnover machine, the air curtain variable flow principle is utilized, an air knife is adopted to form an air curtain structure to block communication between a feeding bin and the outside, and a negative pressure assembly is combined to suck and recycle dust. The high-speed airflow forms an air curtain after passing through the airflow guide groove and is sprayed into the stock bin, flapping materials are separated from the outside of the feeding bin, meanwhile, the flapping materials are converged with the flapping material airflow, the motion direction of the flapping material airflow is changed, and the flapping material airflow is pushed forwards along the upper space of the stock bin. When materials move along with changed airflow and then fall into the bottom of the feeding bin again under the action of gravity after large-mass tobacco shreds move for a certain distance, light-mass dust continues to move forwards at low wind speed, separation of the tobacco shreds and smoke dust is completed, the problem of material flapping caused by backflushing airflow in the box turning process is effectively solved, tobacco shred loss is reduced, and the production efficiency is improved. And the dust concentration of the field environment is reduced.

Description

Technical Field

[0001] The invention relates to the field of dust suppression equipment, and in particular to an air curtain variable flow type consumption reduction dust suppression device and method. Background Art

[0002] The process of turning and unloading tobacco boxes in the tobacco supply warehouse is mainly composed of two types of equipment: a mobile box turning and unloading machine and a feeding bin. During production, the mobile box turning machine clamps the cigarette box and finds the corresponding feeding bin to turn and unload the cigarette box. During the turning process of the cigarette box, the box cover gradually opens, and the tobacco material slides down along the inner wall of the box under the action of gravity and falls into the feeding bin. The feeding bin uses a photoelectric switch to control the height of the material in the bin, and drives the bottom belt forward through the reducer to transport the material. At the same time, the environmental dust removal hood at the front end of the feeding bin can absorb part of the dust, thereby achieving a dust removal effect. However, in the actual production process, there is a phenomenon of material fluttering (material overflow) when the mobile box turning machine unloads the material, resulting in tobacco loss (the average consumption of finished tobacco is 6.2kg / batch according to statistics) and excessive dust concentration in the box turning area (the time-weighted average value of dust concentration in the box turning area measured on-site is 1.43mg / m 3 , much higher than other areas), which not only increases tobacco consumption but also is detrimental to the physical and mental health of workers.

[0003] A rotary through-flow air curtain dust removal system is disclosed in a Chinese patent (publication number CN 113955379 A), wherein an air collecting hood is arranged above the tobacco stem dumping device, the through-flow air column is arranged on both sides of the tobacco stem conveyor belt, a through-flow port is arranged on the through-flow air column, the through-flow air column is connected to the air supply duct, one end of the air collecting hood is connected to the return air duct, and the other end is connected to the through-flow air column, and the air collecting hood and the through-flow air column are surrounded by a dust collection working area; the dust is effectively confined to the working area where the through-flow air column is located, and the dust is prevented from scattering and causing a high dust content in the on-site environment. However, it is not suitable for the structure at the feeding bin position. The feeding bin is a box-type structure with an open top, and the material feeding and discharging methods are different from it. The through-flow air column cannot be formed at the feeding bin position and effectively remove dust. When the material is poured into the feeding bin, there is still a problem of material overflow, resulting in a large loss of tobacco and excessive dust concentration. Summary of the invention

[0004] The purpose of the present invention is to provide a wind curtain variable flow type consumption reduction and dust suppression device and method in view of the defects of the prior art. The wind curtain variable flow principle is utilized, and a wind knife is adopted to form a wind curtain structure to block the connection between the feeding bin and the outside world, and a negative pressure component is combined to suck and recover the dust, thereby completing the separation of tobacco and smoke dust, effectively solving the problem of material splashing caused by the recoil airflow during the box turning process, reducing tobacco loss, and reducing the dust concentration in the on-site environment.

[0005] The first object of the present invention is to provide an air curtain variable flow type consumption reduction and dust suppression device, which adopts the following scheme:

[0006] include:

[0007] The air knife is installed at one end of the feeding bin opening. The air knife is connected to the pressure air source. The air flow outlet of the air knife serves as an air flow guide groove, and the output air flow forms an air curtain to block the feeding bin opening.

[0008] The negative pressure component comprises a dust collecting hood which is arranged at one end of the feeding bin opening away from the air knife and is connected to a negative pressure source.

[0009] Furthermore, it also includes a guide dust cover, which is located between the negative pressure component and the air duct and covers a partial opening of the feeding bin.

[0010] Furthermore, the guide dust cover includes a first filter cover and a second filter cover which are distributed in a stepped manner, and the first filter cover and the second filter cover are both located above the wind curtain formed by the airflow output from the air duct.

[0011] Furthermore, the wind knife includes a tee and a straight air duct, the two openings of the tee are respectively connected to the straight air ducts, and the two straight air ducts are coaxially distributed, an air flow guide groove is provided on the side wall of the straight air duct, and the other opening of the tee is connected to a pressure air source.

[0012] Furthermore, one axial end of the wind knife straight tube is blocked, and the other end is connected to a tee. In the direction away from the tee along the axial direction of the wind duct straight tube, the inner diameter of the wind knife straight tube gradually increases, so that the output airflow is laminar.

[0013] Furthermore, the tee is T-shaped, the two air knife straight tubes connected by the tee are symmetrically distributed, the tee is connected to the pressure air source through a connecting hose, and a guide plate is provided inside the tee.

[0014] Furthermore, the feeding bin is tilted, and the plane where the air curtain formed by the airflow output by the airflow guide groove is located is angled with the plane where the feeding bin opening is located.

[0015] Furthermore, the wind knife is installed at one end of the inclined feeding bin which is in a lower position.

[0016] The second object of the present invention is to provide a working method of the wind curtain variable flow type consumption reduction and dust suppression device as described in the first object, comprising:

[0017] Open the pressure air source, the air flow enters the air knife and is output from the air flow guide groove of the air duct to form an air curtain, which blocks the opening of the feeding bin to isolate the external dust from the inside of the feeding bin;

[0018] When the material is put into the feeding bin through the opening of the feeding bin, a material-grabbing airflow is formed;

[0019] In the airflow, the heavier tobacco follows the wind curtain and moves a distance toward the dust hood, and falls to the bottom of the feeding bin under the action of gravity; the lighter tobacco carries the dust and moves under the action of the wind curtain, and the dust and tobacco are separated, and the tobacco falls to the bottom of the feeding bin, and the dust continues to move to the dust hood and is discharged from the feeding bin;

[0020] The air curtain continues to block the feeding bin opening, isolating external dust from the inside of the feeding bin.

[0021] Furthermore, the working time of the wind knife covers the entire process of turning over and unloading materials, and enables the wind curtain to work continuously.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] In order to solve the problem of material flying out of the silo during the turning and unloading process of the mobile box tipping machine, the wind curtain flow change principle is utilized and a wind knife is used to form a wind curtain structure to block the connection between the feeding silo and the outside world. The negative pressure component is combined to extract and recover the dust. The high-speed airflow forms a wind curtain after passing through the airflow guide groove and is sprayed into the silo. The material is isolated from the outside of the feeding silo and merged with the material airflow, changing the direction of the material airflow and causing it to move forward along the upper space of the silo. When the material moves with the changing airflow, the heavier tobacco runs for a distance and falls back to the bottom of the feeding silo under the action of gravity. The lighter dust continues to move forward at a lower wind speed, completing the separation of tobacco and smoke dust. This effectively solves the material flying problem caused by the recoil airflow during the box turning process, reduces tobacco loss, and reduces the dust concentration in the on-site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 It is a schematic diagram of the wind curtain variable flow type dust reduction and suppression device in Examples 1 and 2 of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the wind curtain variable flow type energy saving and dust suppression device in Examples 1 and 2 of the present invention.

[0027] Figure 3 Schematic diagram of the structure of the wind knife in Examples 1 and 2 of the present invention.

[0028] Figure 4 It is a schematic diagram of the control process of the wind curtain variable flow type energy saving and dust suppression device in Examples 1 and 2 of the present invention.

[0029] Figure 5 Schematic diagram of the guide dust cover in Examples 1 and 2 of the present invention.

[0030] Figure 6 Schematic diagram of the connecting clamps distributed on the wind knives in Examples 1 and 2 of the present invention.

[0031] Among them, 1. the first filter cover; 2. the second filter cover; 3. the left bracket; 4. the wind knife straight pipe; 5. the hexagonal flat head screw; 6. the right bracket; 7. the tee; 8. the connecting clamp; 9. the hexagonal flat head screw; 10. the elbow; 11. the connecting hose; 12. the high-pressure vortex fan; 13. the fan bracket; 14. the airflow guide groove. DETAILED DESCRIPTION

[0032] Example 1

[0033] In a typical embodiment of the present invention, Figure 1-Figure 6 As shown, a wind curtain variable flow type consumption reduction and dust suppression device is provided.

[0034] The feeding bin is a box-shaped structure with an open top. The material feeding and discharging methods are different from it. The through-flow wind column cannot be formed at the feeding bin position and effectively remove dust. When the material is poured into the feeding bin, there is still a problem of material overflow, resulting in a large amount of tobacco loss and excessive dust concentration. Based on this, this embodiment provides a wind curtain variable flow type consumption reduction and dust suppression device, which can use wind knives to form a wind curtain to block the opening of the feeding bin, thereby blocking the connection between the feeding bin and the outside world, and combined with a negative pressure component to suck and recover dust, complete the separation of tobacco and smoke, and effectively solve the problem of material splashing caused by the recoil airflow during the box turning process, reduce tobacco loss, and reduce the dust concentration in the on-site environment.

[0035] like Figure 1 and Figure 2 As shown, the wind curtain variable flow type dust reduction and suppression device mainly includes a wind knife and a negative pressure component. The wind knife is installed at one end of the feeding bin opening, the wind knife is connected to the pressure air source, the air flow outlet of the wind knife serves as the air flow guide groove 14, and the output air flow forms a wind curtain that blocks the feeding bin opening; the negative pressure component includes a dust hood, which is arranged at the end of the feeding bin opening away from the wind knife and is connected to the negative pressure source.

[0036] In this embodiment, the wind curtain variable flow type consumption reduction and dust suppression device is divided into three parts. The first part, as a hardware system, produces a high-speed and uniform airflow that is sprayed into the silo to form a wind curtain. On the one hand, it isolates the material from the outside of the feeding silo, and on the other hand, it merges with the material airflow to change the direction of the material airflow and make it move forward along the upper space of the silo. When the material moves with the changing airflow, the heavier tobacco runs for a distance and then falls back to the bottom of the feeding silo under the action of gravity. The lighter dust continues to move forward at a lower wind speed, completing the separation of tobacco and smoke. Finally, it is sucked away under the slight negative pressure component at the front end and enters the centralized dust removal, which not only reduces the loss of tobacco but also suppresses the overflow of smoke.

[0037] The second part is the control system of the hardware system, which controls the start and stop of the fan of the corresponding feeding bin through the automatic control program. The fan working time covers the entire process of turning over and unloading to ensure the continuity and stability of the wind curtain. The third part is the guide dust cover, which adopts PM2.5 breathing guide dust cover. The guide dust cover is located between the negative pressure component and the air duct, and covers the partial opening of the feeding bin to achieve ventilation and dust suppression effect.

[0038] For the first part, the pressure air source connected to the wind knife can be a high-pressure vortex fan 12. The wind knife includes a tee 7 and a straight air duct. The two openings of the tee 7 are respectively connected to the wind knife straight pipe 4, and the two wind knife straight pipes 4 are coaxially distributed. The side wall of the wind knife straight pipe 4 is provided with an air flow guide groove 14, and the other opening of the tee 7 is connected to the pressure air source. One axial end of the wind knife straight pipe 4 is blocked, and the other end is connected to the tee 7. In the direction away from the tee 7 along the axial direction of the straight air duct, the inner diameter of the wind knife straight pipe 4 gradually increases, so that the output airflow is laminar.

[0039] like Figure 3 and so5 and Figure 6 As shown, the tee 7 is T-shaped, and the two wind knife straight pipes 4 connected by the tee 7 are symmetrically distributed. The tee 7 is connected to the pressure gas source through the connecting hose 11 and the elbow 10. The high-pressure vortex fan 12 adopts frequency conversion control to provide power for the wind knife to output the airflow. The high-pressure vortex fan 12 is fixedly installed on the fan bracket 13; the spray airflow provided by the high-pressure vortex fan 12 passes through the connecting hose 11, the elbow 10, and the tee 7 in sequence and then enters the wind knife straight pipe 4. The wind knife straight pipe 4 is installed on the connecting plate at the tail end of the feeding bin through the wind knife fixed left bracket 3 and the wind knife fixed right bracket 6, and is connected and fixed by the hexagon socket flat head screw 5 and the hexagon socket flat head screw 9. The elbow 10 and the tee 7 are connected and fixed by the connecting clamp 8. The wind knife is designed with an airflow guide groove 14. The high-speed airflow forms a wind curtain after passing through the guide groove and sprays into the bin.

[0040] At work, if Figure 2 and Figure 3 As shown, the airflow generated by the fan is delivered to the three-way pipe 7 with a guide plate inside, increasing the wind speed while evenly dividing the airflow into the two ends of the wind knife, ensuring the stability of the airflow pressure in the wind knife, and the wind knife is installed on the connecting plate at the tail end of the feeding bin. The airflow guide groove 14 opened on the wind knife straight pipe 4 is a rectangular slit.

[0041] The wind knife straight pipe 4 is provided with an airflow guide groove 14. The cross-sectional area of ​​the wind knife straight pipe 4 gradually decreases in the direction away from the tee 7 along the axial direction of the air duct straight pipe. When the outer diameter of the wind knife straight pipe 4 is fixed, the inner diameter of the wind knife straight pipe 4 gradually increases. The wind knife straight pipe 4 is equivalent to an air storage bag, which has a pressurizing effect, so that the wind speed in the wind knife gradually increases, which can offset part of the pressure loss at the airflow guide groove 14 and provide a greater positive pressure for spraying. The through-type airflow guide groove 14 can ensure that the flow state of the airflow after being ejected is laminar, which reduces the mutual disturbance between the airflows and makes the airflow transmission distance longer. After passing through the airflow guide groove 14, the high-speed airflow forms a stable wind curtain and sprays into the silo, isolating the material from the outside of the feeding silo while merging with the material airflow, changing the direction of the material airflow movement, so that the material falls back to the bottom of the silo under the action of its own gravity during the process of changing the airflow movement, thereby achieving material consumption reduction and smoke suppression.

[0042] Specifically, Figure 3 As shown, the air knife needs to be installed at the tail end of the feeding silo. Considering the on-site space, installation convenience and the strength of the silo tail support plate, the air knife adopts a lightweight cross-section gradient air knife straight pipe 4 and opens an airflow guide groove 14. The airflow guide groove 14 is set to be a (according to the silo size, a=2m) long and b wide. The air knife is mainly composed of two sections of cross-section gradient air knife straight pipes 4, a section of tee 7 pipe and an elbow 10. The airflow guide groove 14 is distributed along the generatrix direction of the outer wall of the air knife straight pipe 4.

[0043] To ensure the accuracy of the hardware system, when the slit width b = 0.002m, the airflow propulsion speed is faster, the overflow is less, and it is closer to the laminar state. At the same time, the horizontal airflow can significantly change the direction of the airflow in the second half of the feeding bin. The airflow guide through the dust cover in the first half of the feeding bin enters the front negative pressure component dust removal system, which can effectively prevent smoke and dust from overflowing. The width of the airflow guide groove 14 is determined to be 2mm. According to the on-site installation space, the diameter of the wind knife straight pipe 4 is selected to be 50mm and the wall thickness is 2mm. After verification and calculation, the wind speed in the spray pipe is V at this time. 干管风速 =20.38m / s.

[0044] S10, the high-pressure vortex fan 12 is selected as a direct-connected type, and the specific parameters are determined by calculating the air volume and total pressure;

[0045] S11, according to the above calculation, the minimum air volume of the high pressure vortex fan 12 is:

[0046] Q=V S ×S=V S ×a×b=10.02×2×0.002m 3 / s=144.3m 3 / h

[0047] S12, determine the pressure loss of the entire air supply system, which is mainly composed of friction pressure loss and local pressure loss; ΔP = ΔP m +ΔP j

[0048] Where, ΔP—pressure loss of air knife straight pipe 4, Pa; ΔP m —Friction pressure loss, Pa; ΔP j —Local pressure loss, Pa.

[0049] S12 Friction Pressure Loss Calculation

[0050] The friction pressure loss of the air knife straight pipe 4 is calculated according to the following formula:

[0051]

[0052] Where, λ is the friction coefficient; d H —Hydraulic diameter of wind knife straight pipe 4, m; V—wind speed inside wind knife straight pipe 4, m / s.

[0053] ρ—air density, kg / m 3 ; l—length of wind knife straight tube 4, m.

[0054] The friction pressure loss is mainly composed of the friction loss of the pipeline during the air flow transmission process. According to the manual, for the rough pipe, λ = 0.036, and for the smooth pipe, λ = 0.025.

[0055] After calculation:

[0056]

[0057] It can be calculated that the friction pressure loss of the air knife straight pipe 4 is ΔP m =744.3pa.

[0058] Local pressure loss calculation:

[0059] The local pressure loss is mainly caused by the change of cross section or flow rate. Here, it is mainly the pressure loss of air passing through the tee 7 and the air flow guide groove 14. Here, it is a rectangular expansion pipe air supply system. By referring to the "Practical Heating and Air Conditioning Design Manual", its local resistance coefficient ζ 三通管 =1.0,ζ 条缝口 =291.88,ζ 弯头 =0.42.

[0060] The calculation of local pressure loss is shown in formula (7):

[0061]

[0062] Substituting the data, we get:

[0063]

[0064] It can be calculated that the local pressure loss of the air knife straight pipe 4 is ΔP j =16602.3pa. Therefore, the total pressure loss of the wind knife straight pipe 4 is

[0065] ΔP=ΔP m +ΔP j =(744.3+16246)pa=16.99kpa

[0066] The minimum air volume required for the air curtain is 144m 3 / h, the minimum wind pressure is 16.99kpa. Because the high-pressure vortex air pump is frequency-converted driven, the power is selected to be 2.8kW, the maximum positive pressure is 28kpa, and the rated air volume is 280m3 / h.

[0067] To select a frequency converter:

[0068] Calculation formula for inverter capacity (kVA) required for continuous constant load operation

[0069]

[0070] I CN ≥kI M (10)

[0071] Where P M —The shaft output power of the motor required by the load, kW; η—The efficiency of the motor (usually about 0.75);

[0072] cosφ—power factor of the motor (usually about 0.75); U M —Motor voltage (V);

[0073] I M —Motor current (A), the current when the power supply is industrial frequency; k——correction coefficient of current waveform (1.05~1.0 when PWM mode);

[0074] P CN ——Rated capacity of the inverter (kVA); I CN ——Rated current of the inverter (A).

[0075] The motor voltage of the selected high-pressure vortex blower 12 is 380V and the power is 1.5kW, and the motor current can be obtained.

[0076]

[0077] The motor voltage U of the high-pressure vortex fan 12 is M=380V, power P M =2.8kW, current I M =5.7A and other parameter values ​​are substituted into formula (8)(9)(10) to obtain the inverter rated capacity P CN ≥5.3kVA, rated current of inverter I CN ≥5.98A, and the rated power of the inverter should be greater than 2.8kw.

[0078] In this embodiment, a Danfoss inverter FC-302P5P5K5T5E55H1XGC is selected, with a rated output power of 5.5 kW, a rated input current of 11.7 A, and a rated output current of 13 A.

[0079] Design of fan mounting bracket:

[0080] The high-pressure vortex fan 12 is installed on the silo support legs. The size of the four mounting holes of the fan base is φ12mm, and the center distance is (100×320)mm. According to the on-site installation space, the overall size of the high-pressure vortex fan 12 mounting bracket is determined to be (580×580×5)mm, and the material is 304 stainless steel plate. Corresponding to the hole size of the high-pressure vortex fan 12 base, a φ12.5mm through hole is designed on the support plate. The two right-angled sides of the support plate are slit and bent 45°, and each bent edge is designed with 2 φ10.5 through holes, which are convenient for fixing to the feeding silo beam with M10 bolts. The other two corresponding right-angled sides are slit and bent 90°, and the sharp angles at the cutting are blunted and burred. The support column uses a stainless steel pipe with a length of 65mm and an outer diameter of φ20mm. The lower end is connected to an adjustable support seat to facilitate the horizontal adjustment of the support plate.

[0081] like Figure 2 and Figure 3 As shown, the feeding bin is tilted, the plane where the air curtain formed by the airflow output from the airflow guide groove 14 is located is angled with the plane where the feeding bin opening is located, and the wind knife is installed at the lower end of the tilted feeding bin.

[0082] Among them, the spray angle and fan frequency are optimized. In order to achieve the best anti-pouring effect of the wind curtain variable flow type consumption reduction and dust suppression device and minimize the tobacco consumption, it is necessary to find the optimal combination of the two parameters of the spray angle of the wind knife straight tube 4 and the frequency of the high-pressure vortex fan 12. This is optimized through the 2K factor test. The high-pressure vortex air pump adopts variable frequency control. The fan frequency will affect the air volume, which will in turn affect the anti-pouring effect; the installation angle of the wind knife straight tube 4 determines the direction of the airflow. If it is too high, the airflow will overflow directly, and if it is too low, the anti-pouring effect cannot be achieved. For this reason, the fan frequency is selected to be (30-45) Hz, and the angle between the wind knife straight tube 4 and the inclined surface of the feeding bin is between (10°-20°). The experimental results show that when the fan frequency is 40.5Hz and the angle between the wind knife straight tube 4 and the inclined surface of the feeding bin is 15°, the effect is best. At this time, the airflow flows forward along the lower edge of the upper plane of the feeding bin, and is sent to the environment for dust removal through the dust removal hood. A small amount of overflow air is filtered through the PM2.5 breathing guide dust cover and then discharged.

[0083] For the control system of the second part, such as Figure 4 As shown, it includes two parts: hardware configuration and control program writing. During hardware configuration, frequency converters, fan motors, modules, relays and other devices can be added through the PLC of the finished silk electric control cabinet CP610. The box turning machine dispatches the box turning signal to the main electric control cabinet. The finished silk electric control cabinet CP610 determines the feeding bin number of the box turning and unloading by reading the corresponding signal, and controls the start and stop of the fan of the corresponding feeding bin through the automatic control program.

[0084] Through on-site observation and recording of the box turning machine's box turning and unloading action time, it takes 8 seconds from the start of box turning to opening the cover, and 12 seconds from the start of unloading to the completion of unloading. In response to this, a fan start-stop control process is formulated: when receiving a box turning signal, the inverter starts with a delay of 5 seconds, and the fan stops after working continuously for 20 seconds. The fan working time covers the entire process of box turning and unloading to ensure the continuity and stability of the air curtain.

[0085] like Figure 5 As shown, the guide dust cover includes a first filter cover 1 and a second filter cover 2 distributed in a stepped manner, and the first filter cover and the second filter cover are both located above the wind curtain formed by the airflow output from the air duct. The guide dust cover is composed of a stainless steel frame, a new material PM2.5 breathing filter and a stainless steel layer. The frame is made of a (30×15×2) mm square tube, and the layer is made of a 1.5 mm thick stainless steel plate. A total of 2 pieces are installed. According to on-site measurements, the size parameters are (2050×800) mm and (2140×185) mm respectively.

[0086] Example 2

[0087] In another typical embodiment of the present invention, Figure 1-Figure 6As shown, a working method of a wind curtain variable flow type consumption reduction and dust suppression device is provided, using the wind curtain variable flow type consumption reduction and dust suppression device as in Example 1.

[0088] A working method of an air curtain variable flow type consumption reduction and dust suppression device, comprising:

[0089] Open the pressure air source, the air flow enters the air knife and is output from the air flow guide groove 14 of the air duct to form an air curtain, which blocks the opening of the feeding bin to isolate the external dust from the inside of the feeding bin;

[0090] When the material is put into the feeding bin through the opening of the feeding bin, a material-grabbing airflow is formed;

[0091] In the airflow, the heavier tobacco follows the wind curtain and moves a distance toward the dust hood, and falls to the bottom of the feeding bin under the action of gravity; the lighter tobacco carries the dust and moves under the action of the wind curtain, and the dust and tobacco are separated, and the tobacco falls to the bottom of the feeding bin, and the dust continues to move to the dust hood and is discharged from the feeding bin;

[0092] The air curtain continues to block the feeding bin opening, isolating external dust from the inside of the feeding bin.

[0093] The working time of the wind knife covers the entire process of box turning and material unloading, and enables the wind curtain to work continuously.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind curtain variable flow type consumption reduction and dust suppression device, characterized in that: include: The air knife is installed at one end of the feeding bin opening. The air knife is connected to the pressure air source. The air flow outlet of the air knife serves as an air flow guide groove, and the output air flow forms an air curtain to block the feeding bin opening. The negative pressure component comprises a dust collecting hood which is arranged at one end of the feeding bin opening away from the air knife and is connected to a negative pressure source.

2. The wind curtain variable flow type consumption reduction and dust suppression device according to claim 1, characterized in that: It also includes a guide dust cover, which is located between the negative pressure component and the air duct and covers a partial opening of the feeding bin.

3. The wind curtain variable flow type dust reduction and suppression device according to claim 2, characterized in that: The guide dust cover comprises a first filter cover and a second filter cover which are distributed in a stepwise manner, and the first filter cover and the second filter cover are both located above the wind curtain formed by the airflow output from the air duct.

4. The wind curtain variable flow type consumption reduction and dust suppression device according to claim 1, characterized in that: The wind knife includes a tee and a straight air duct. The two openings of the tee are respectively connected to the straight air ducts, and the two straight air ducts are coaxially distributed. An air flow guide groove is provided on the side wall of the straight air duct. The other opening of the tee is connected to a pressure air source.

5. The wind curtain variable flow type dust reduction and suppression device according to claim 4, characterized in that: One axial end of the wind knife straight pipe is blocked, and the other end is connected to a tee. In the direction away from the tee along the axial direction of the wind duct straight pipe, the inner diameter of the wind knife straight pipe gradually increases, so that the output airflow is laminar.

6. The wind curtain variable flow type consumption reduction and dust suppression device according to claim 5, characterized in that: The tee is T-shaped, and the two air knife straight pipes connected to the tee are symmetrically distributed. The tee is connected to the pressure air source through a connecting hose, and a guide plate is arranged inside the tee.

7. The wind curtain variable flow type dust reduction and suppression device according to claim 1, characterized in that: The feeding bin is tilted, and the plane where the air curtain formed by the airflow output by the airflow guide groove is located is angled with the plane where the feeding bin opening is located.

8. The wind curtain variable flow type consumption reduction and dust suppression device according to claim 7, characterized in that: The air knife is installed at one end of the inclined feeding bin which is in a lower position.

9. A working method of an air curtain variable flow type consumption reduction and dust suppression device, using the air curtain variable flow type consumption reduction and dust suppression device as claimed in any one of claims 1 to 8, characterized in that: include: Open the pressure air source, the air flow enters the air knife and is output from the air flow guide groove of the air duct to form an air curtain, which blocks the opening of the feeding bin to isolate the external dust from the inside of the feeding bin; When the material is put into the feeding bin through the opening of the feeding bin, a material-grabbing airflow is formed; In the airflow, the heavier tobacco follows the wind curtain and moves a distance toward the dust hood, and falls to the bottom of the feeding bin under the action of gravity; the lighter tobacco carries the dust and moves under the action of the wind curtain, and the dust and tobacco are separated, and the tobacco falls to the bottom of the feeding bin, and the dust continues to move to the dust hood and is discharged from the feeding bin; The air curtain continues to block the feeding bin opening, isolating external dust from the inside of the feeding bin.

10. The working method of the wind curtain variable flow type consumption reduction and dust suppression device according to claim 9, characterized in that: The working time of the wind knife covers the entire process of box turning and material unloading, and enables the wind curtain to work continuously.

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