On-site flexible winnowing equipment with novel structure

Abstract

An in-situ flexible winnowing device with a novel structure is formed by transforming an existing primary winnowing device and comprises a winnowing box used for separating tobacco shreds and slivers, a feeding conveying belt, a discharging conveying belt and an air conveying circulating device, and the feeding conveying belt and the discharging conveying belt are located on the left side and the right side of the winnowing box respectively. The circulating device is sequentially composed of a suction opening, a negative pressure suction fan, a lifting pipe, a winnowing dust removal device, an air pipe and a side air opening communicated with the winnowing box, a cut tobacco discharging airlock is arranged at the discharging end of the discharging conveying belt, a stem collecting device is arranged on the lower portion of the winnowing box, and the tobacco leaf winnowing device is characterized in that a flow guide plate opposite to the side air opening is additionally arranged at the position of an upper edge opening of the winnowing box. The device has the advantages that under the condition that flexible winnowing equipment is not replaced or additionally arranged, the flow guide plate is additionally arranged in the winnowing box, the material movement speed is reduced, the tobacco shred movement path is changed, the winnowing distance and time of tobacco shreds in the winnowing box are increased, and the tobacco shred winnowing efficiency is improved. According to the device, the sliver rejection rate is increased, the silk content in the slivers is reduced, and the device cost is reduced.

Description

Technical Field

[0001] The utility model relates to a cigarette processing equipment, in particular to an in-situ (i.e., online) flexible air separation equipment with a new structure, which is transformed on the basis of the existing primary air separation equipment. Background Art

[0002] Cut tobacco air separation is an important process in the cigarette production and cut tobacco section, and its purpose is to separate cut tobacco from stem pieces. The separation effect of cut tobacco and stem pieces is related to the magnitude of the wind speed and the screening time of cut tobacco in the air separation chamber. At present, cigarette factories generally adopt the primary air separation method to separate cut tobacco from stem pieces, and its structure is as Figure 1 shown. The materials conveyed by the feeding conveyor belt contain cut tobacco, stem pieces, and dust. The dust is lighter in weight and enters the dust collector through the exhaust port, dust removal device, riser pipe, air separation device, and discharge air lock according to the trajectory N1. The mixture of cut tobacco and stem pieces is conveyed by the high-speed conveyor belt. Since the cut tobacco is lighter in weight than the stem pieces, the cut tobacco enters the discharge conveyor belt and the discharge air lock from the upper part of the air separation box according to the trajectory N2 and is collected, and the stem pieces fall into the stem piece collection device from the lower part of the air separation box. This makes the air separation area of the air separator shorter, the time for the materials to be air separated shorter, and the air separation effect poorer. The results are as follows: If the wind speed is too small, the stem piece rejection rate is relatively high, but the cut tobacco content in the rejected stem pieces is also high, resulting in waste of cut tobacco. If the wind speed is too large, the stem piece rejection rate is relatively low, and the cut tobacco content with stems after air separation is high, affecting the appearance quality and sensory quality of cigarettes.

[0003] The invention patent CN116210951A discloses a device for removing stem pieces during the cigarette cut tobacco process. The device includes a coarse stem piece removal unit and a fine stem piece removal unit, which is equivalent to adding a two-stage air separation device, and improves the stem piece removal efficiency through multi-stage air separation.

[0004] The invention patent CN117644034A discloses an air separator, which is equipped with a plurality of air outlet channels with adjustable air inlet areas and an adjustment mechanism. This air separator can accurately separate different materials through the negative pressure channel and the suction box at the top and the light material discharge device at the bottom. Two inclined spoiler plates optimize the air flow direction and improve the separation efficiency.

[0005] The patent CN202172826U discloses a stem cut tobacco separation equipment, which is characterized in that the blocking blocks misaligned on both sides of the shell and the guiding arc plates between the blocking blocks jointly form an S-shaped air flow channel, and improve the stem cut tobacco rejection rate by improving the structure of the separation chamber.

[0006] Although the above patents can all improve the stem piece rejection effect to a certain extent, the disadvantages are complex structure and large floor area of the equipment. To solve the above problems, it is very necessary to design a simple and efficient flexible air separation equipment. Utility Model Content

[0007] The purpose of the present utility model is to provide a locally flexible air separation device with a new structure based on the problems existing in the above-mentioned prior art. This device is modified on the basis of the existing primary air separation device, which improves the rejection rate of stem pieces while reducing the silk content in the stem pieces and minimizes the equipment cost to the greatest extent.

[0008] The purpose of the present utility model is achieved through the following technical solutions:

[0009] A locally flexible air separation device with a new structure is modified on the basis of the existing primary air separation device, including an air separation box for separating cut tobacco and stem pieces, a feeding conveyor mechanism and a discharging conveyor belt located on both sides of the air separation box, and a pneumatic conveying and recycling device. The pneumatic conveying and recycling device is successively composed of an air extraction port at the upper left of the air separation box, a suction negative pressure fan 、 a riser pipe, an air separation and dust removal device, an air duct and a side air inlet leading to the air separation box. The air flow is in a cycle. A fan is connected to the outside of the air extraction port to generate a suction negative pressure to produce an air flow. The air flow circulates back to the air separation box through the riser pipe, the air separation and dust removal device, the air duct and the side air inlet, realizing the reuse of gas. ； A cut tobacco discharging air lock is provided at the discharging end of the discharging conveyor belt, and a stem piece collection device is provided at the lower part of the air separation box. Among them: a guide plate opposite to the side air inlet is additionally provided at the upper edge position of the air separation box. The two ends of the guide plate are supported on the side wall plates of the air separation device, and the upper end position of the cross section of the guide plate is flush with the end face of the discharging end of the feeding conveyor belt. The width of the widest part of the cross section of the guide plate is 1 / 2 - 1 / 4 of the width of the upper edge of the air separation box. The guide plate is arranged at the upper edge position of the air separation box. The cut tobacco and stem pieces conveyed by the high-speed conveyor belt collide with the guide plate, and the movement speed slows down, increasing the air separation time. At the same time, the guide plate changes the movement path of the cut tobacco and stem pieces, also increasing the air separation time and improving the air separation efficiency. 。

[0010] In the present utility model, the cross section of the guide plate is triangular, rectangular, circular, elliptical or polyhedral, and guide plates with different cross-sectional shapes can be selected according to the grade of the incoming material, the requirement of the stem piece rejection rate, etc.

[0011] The specific cross-sectional shape of the guide plate and its application characteristics are as follows:

[0012] Rectangular cross section:

[0013] Applicable grade: Suitable for incoming materials with a lower grade and a greater requirement for the stem piece rejection rate.

[0014] Basis: The rectangular guide plate can significantly slow down the movement speed of the material, increase the air separation time, and thus improve the air separation efficiency, but it may cause relatively serious breakage of the cut tobacco at the same time. Therefore, it is suitable for the air separation of cut tobacco with a lower grade.

[0015] Isosceles triangle cross section:

[0016] Applicable grade: Suitable for materials with medium grade and medium rejection rate requirements.

[0017] Basis: The isosceles triangle deflector can moderately slow down the movement speed of the material, change the movement path of the material at the same time, and increase the air separation time. The degree of cut tobacco breakage caused by it is medium, so it is suitable for medium-grade cut tobacco.

[0018] Circular and elliptical cross-sections:

[0019] Applicable grade: Suitable for materials with higher grade and lower stem rejection rate requirements.

[0020] Basis: The influence of the circular deflector on the air flow is relatively uniform and smooth. Compared with the rectangular deflector, it can effectively reduce the collision intensity of the material on the deflector, thus minimizing the breakage of the cut tobacco. It will not significantly change the material path like the rectangular deflector, and is suitable for the air separation of cut tobacco with lower stem rejection rate requirements.

[0021] Irregular triangle cross-section:

[0022] Applicable grade: Suitable for materials with higher grade and higher rejection rate requirements.

[0023] Basis: The irregular triangle deflector has a smaller windward angle, a longer hypotenuse on the windward side, and a shorter hypotenuse on the back side. This design greatly reduces the collision area of the cut tobacco, thus effectively reducing the degree of cut tobacco breakage and is suitable for the air separation of higher-grade cut tobacco.

[0024] Furthermore, the distance from the deflector to the side air outlet is between 20 cm and 50 cm, and the closest distance is 20 cm.

[0025] Furthermore, the feeding and conveying mechanism is composed of a feeding conveyor belt and a high-speed feeding conveyor belt.

[0026] Furthermore, air inlet holes are provided on the lower side wall of the air separation box, so that the cut tobacco bypassing from the lower part of the deflector can move upward under the drive of the negative pressure air flow at the air outlet. Air inlet holes are provided on the side, which will not affect the dropping of the bottom stems, because the bottom is open, and the side wall openings only play a role in adjusting the air field.

[0027] A dust collector and a dust discharge air lock are provided at the lower part of the air separation device.

[0028] The side air outlet at the air outlet of the air duct is located below the discharge end of the feeding conveyor belt and is directly opposite to the deflector position.

[0029] The working principle and process of the present utility model are as follows: After the cut tobacco enters the air separation box through the high-speed conveyor belt, some of the lighter cut tobacco is separated from other incoming materials, falls onto the discharge conveyor belt, and enters the next process through the cut tobacco discharge air lock. The dust enters the air separation and dust removal device along with the negative pressure suction and the generated air flow and is removed by the bottom dust discharge air lock. ， The clean air flow is blown into the air separation box again along the air duct and the side air vents to form a cycle. The stem pieces and the heavier cut tobacco collide with the deflector plate, the movement speed slows down, and they enter the air separation box after bypassing the lower part of the deflector plate. The cut tobacco and the stem pieces are separated in the air separation box due to different suspension speeds. The cut tobacco rises with the air flow after bypassing the lower part of the deflector plate, passes through the discharge conveyor belt, and enters the next process through the cut tobacco discharge air lock. The stem pieces fall from the bottom of the air separation box to the stem piece collection device.

[0030] The advantages of the present utility model are as follows: Without replacing or adding flexible air separation equipment, a deflector plate is added inside the air separation box to reduce the movement speed of the materials, change the movement path of the cut tobacco, increase the air separation distance and time of the cut tobacco inside the air separation box, and improve the air separation efficiency of the cut tobacco. The present utility model reduces the silk content in the stem pieces while increasing the stem piece rejection rate, and minimizes the equipment cost to the greatest extent. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the existing on-site flexible air separation equipment.

[0032] Figure 2 Schematic diagram of the equipment of the present utility model with a rectangular deflector plate added.

[0033] Figure 3 Schematic diagram of the equipment of the present utility model with an isosceles triangular deflector plate added.

[0034] Figure 4 Schematic diagram of the equipment of the present utility model with a triangular deflector plate added.

[0035] Figure 5 Schematic diagram of the equipment of the present utility model with an irregular triangular deflector plate added.

[0036] In the figure: N1 is the material running track Ⅰ, N2 is the material running track Ⅱ, 1 is the dust collector, 2 is the dust discharge air lock, 3 is the air separation and dust removal device, 4 is the riser pipe, 5 is the negative pressure extraction fan, 6 is the extraction air vent, 7-1 is the feed conveyor belt, 7-2 is the high-speed feed conveyor belt, 7-3 is the discharge conveyor belt, 8 is the cut tobacco discharge air lock, 9 is the air separation box, 10 is the stem piece collection device, 11 is the side air door, 12 is the air duct. ， 13 is the deflector plate 。 Detailed Implementation Modes

[0037] The present utility model will be further described below in conjunction with the drawings:

[0038] As shown Figures 1-5 in the figure: A new type of in-situ flexible air separation equipment is modified on the basis of the existing primary air separation equipment (see Figure 1 ), and includes an air separation box for separating cut tobacco and stem chips, a feeding conveyor belt and a discharging conveyor belt located on both sides of the air separation box, and a pneumatic conveying circulation device. The pneumatic conveying circulation device is successively composed of an air extraction port 6, a negative pressure extraction fan 5 、 a riser 4, an air separation and dust removal device 3, an air duct 12, and a side air outlet 11. The wind power is in a cycle. The outside of the air extraction port 6 is connected with a negative pressure extraction fan 5, and the negative pressure extraction generates air flow. The air flow circulates back to the air separation box 9 through the side air outlet 11, realizing the reuse of gas 。 At the discharging end of the discharging conveyor belt 7-3, a cut tobacco discharging air lock 8 is provided, and at the lower part of the air separation box, a stem chip collection device 10 is provided. Among them: A guide plate 13 is additionally provided at the upper edge position of the air separation box 9 and is opposite to the side air outlet 11. Both ends of the guide plate are supported on the side wall plates of the air separation equipment, and the upper end position of the cross section of the guide plate is flush with the end face of the discharging end of the feeding conveyor belt. The width of the widest part of the cross section of the guide plate is 1 / 2 - 1 / 4 of the width of the upper edge of the air separation box 9 ； The guide plate 13 is arranged at the upper edge position of the air separation box 9. The cut tobacco and stem chips conveyed by the high-speed feeding conveyor belt 7-2 collide with the guide plate 13, and the moving speed slows down, increasing the air separation time. At the same time, the guide plate changes the moving path of the cut tobacco and stem chips, also increasing the air separation time and improving the air separation efficiency.

[0039] Furthermore, the distance from the guide plate 13 to the side air outlet 11 is between 20 cm and 50 cm, and the closest distance is 20 cm.

[0040] Furthermore, an air inlet hole is opened on the lower side wall of the air separation box 9, so that the cut tobacco bypassing from below the guide plate can move upward under the drive of the negative pressure air flow at the air extraction port.

[0041] A dust collector 1 and a dust discharging air lock 2 are provided at the lower part of the air separation and dust removal device 3.

[0042] The side air outlet 11 at the air outlet of the air duct 12 is located below the discharging end of the high-speed feeding conveyor belt 7-2 and is directly opposite to the position of the guide plate 13.

[0043] More specifically: The in-situ flexible air separation equipment of the present invention adds a guide plate 13 on the basis of the original equipment (as Figure 1 shown in the figure), and as Figures 2-5 shown in the figure, guide plates in the shape of rectangle, isosceles triangle, triangle, and irregular triangle can be respectively added.

[0044] The characteristics and effects of installing guide plates of different shapes are as follows:

[0045] The rectangular deflector can reduce the movement speed of the material, allowing the material to bypass from the lower part of the deflector and enter the air separation box, increasing the air separation time. At the same time, increasing the collision of the material can reduce the entanglement of cut tobacco and stem pieces, thereby improving the stem piece rejection rate of the equipment.

[0046] The isosceles triangular deflector can reduce the movement speed of the material, change the movement path of the material, increase the air separation time, thereby improving the stem piece rejection rate of the equipment. In addition, the cut tobacco breakage caused by this shaped deflector is smaller than that of the rectangular deflector.

[0047] The triangular deflector has an adjustable windward angle with the horizontal plane, that is, the windward angle can be adjusted, so as to control the collision intensity of the cut tobacco and meet the processing requirements of raw materials of different grades, realizing flexible production.

[0048] The irregular triangular deflector has a smaller windward angle, a longer hypotenuse on the windward side, and a shorter hypotenuse on the back side, which can greatly reduce the collision area of the cut tobacco and reduce the cut tobacco breakage.

[0049] The following clearly and completely describes the usage process of the present utility model in conjunction with the embodiments:

[0050] After the cut tobacco enters the air separation box 9, some of the lighter cut tobacco is separated from other incoming materials, falls onto the conveyor belt, and enters the next process through the discharge air lock (8). The dust enters the discharge air lock (2) with the airflow and is removed. The stem pieces and heavier cut tobacco collide with the deflector 13, the movement speed slows down, bypass from the lower part of the deflector 13 and enter the air separation box 9. The cut tobacco and stem pieces are separated in the air separation box due to different suspension speeds. The cut tobacco rises with the airflow after bypassing from the lower part of the deflector 13, passes through the discharge conveyor belt 7-3, and enters the next process through the discharge air lock (8). The stem pieces fall from the air separation box to the stem piece collection device.

[0051] In summary, the present utility model provides a locally flexible air separation device with a new structure, which adds deflectors of different shapes on the basis of the existing air separation device to improve the separation efficiency of cut tobacco and stem pieces. Through the uniquely designed rectangular, isosceles triangular, triangular and irregular triangular deflectors, the residence time and air separation distance of the material in the air separation box during the air separation process are increased. At the same time, the collision behavior reduces the entanglement of cut tobacco and stem pieces and improves the stem piece rejection rate. The present utility model avoids the problems of cut tobacco waste or excessive cut tobacco content in stem pieces caused by improper wind speed. Compared with the existing air separation equipment patents, the present utility model simplifies the equipment structure, reduces the equipment footprint, and realizes the optimal balance between cost and efficiency.

[0052] The above-described embodiments merely represent a certain implementation manner of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A novel structure of on-site flexible air separation equipment, which is modified on the basis of the existing primary air separation equipment, includes an air separation box for separating tobacco shreds and stems, a feeding conveying mechanism located on the left and right sides of the air separation box, a discharging conveying belt, and a wind conveying circulation device, which is sequentially composed of an exhaust air outlet located on the upper left of the air separation box, a negative pressure blower, a lifting pipe, an air separation dust removal device, an air duct and a side air outlet leading to the air separation box, a tobacco shreds discharging air lock is provided at the unloading end of the discharging conveying belt, and a stem collection device is provided at the lower part of the air separation box, and is characterized in that: A guide plate is added at the upper edge of the air separation box opposite to the side air outlet, and the two ends of the guide plate are supported on the two side wall panels of the air separation equipment. The upper end of the guide plate cross section is flush with the end surface of the discharge end of the feed conveyor belt, and the width of the guide plate cross section at the widest part is 1 / 2-1 / 4 of the width of the upper edge of the air separation box.

2. The novel on-site flexible air separation equipment according to claim 1 is characterized in that: The guide plate has a cross section of a triangle, a rectangle, a circle, an ellipse or a polyhedron, and guide plates with different cross-sectional shapes can be selected according to the grade of the incoming material and the requirements of the stem rejection rate.

3. The novel on-site flexible air separation equipment according to claim 1 is characterized in that: The distance from the guide plate to the side air outlet is 20cm-50cm, and the closest distance is 20cm.

4. The novel structure of the on-site flexible air separation equipment according to claim 1 is characterized in that: The feeding conveying mechanism is composed of a feeding conveying belt and a high-speed feeding conveying belt.

5. The novel on-site flexible air separation equipment according to claim 1 is characterized in that: An air inlet hole is provided on the lower side of the air separation box.

6. The novel on-site flexible air separation equipment according to claim 1 is characterized in that: A smoke collector and a smoke discharge air lock are provided at the lower part of the air separation and dust removal device.

7. The novel on-site flexible air separation equipment according to claim 1 is characterized in that: The side air outlet at the air outlet of the air duct is located below the discharge end of the feed conveyor belt and directly opposite to the guide plate.

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