A multi-stage screening machine

Abstract

The present invention discloses a multi-stage screening machine, including a screening device for screening materials; a feeding mechanism for conveying materials to the screening device; a discharging mechanism for receiving the screened materials; and a frame for sequentially installing the feeding mechanism, the screening device and the discharging mechanism; the screening device includes a plurality of roller assemblies for screening materials, the plurality of roller assemblies are sequentially arranged from the feeding mechanism to the discharging mechanism, and the heights are sequentially reduced in the vertical direction to form a stepped arrangement. The present invention avoids the clogging problem of the existing screening device by providing a plurality of roller assemblies for fine screening of materials. The present invention is applied to the tobacco industry, reduces the crushing loss of materials such as tobacco leaves and tobacco stems, and improves the screening efficiency and economic benefits.

Description

Technical Field

[0001] The invention belongs to the field of tobacco-specific equipment, and in particular relates to a multi-stage screening machine. Background Art

[0002] In the tobacco industry, the pre-processes of leaf threshing, re-drying tobacco leaves, and the pre-processes of silk production line such as flavoring and adding materials need to use sand screening equipment to remove the broken tobacco pieces, broken stem segments, and dust, sand and other impurities mixed in the tobacco leaves generated in the previous process, so as to improve the purity of the tobacco leaves, reduce the undesirable effects of tobacco leaves being broken or sticking to the barrel in subsequent processing steps such as leaf threshing, re-drying or adding flavors and materials, and reduce dust pollution in the workshop.

[0003] At present, the tobacco industry mainly uses vibrating screens to clean up broken cigarettes and debris. Since the screen holes of the vibrating screen are easily blocked by materials such as tobacco stems, frequent cleaning is required to maintain the screening function. The screen holes of the vibrating screen are frequently blocked, resulting in a large amount of materials screened out at one time needing to be returned to the main production line for reprocessing, which increases the workload of equipment maintenance, reduces the utilization rate of broken cigarette processing equipment, and increases maintenance costs. Failure to clean the screen in time will lead to a decrease in the screening rate.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a multi-stage screening machine, whose purpose is to finely screen materials of different volumes. Another purpose is to be applied to tobacco production lines to reduce the crushing of materials such as tobacco leaves or stems and prevent the screening equipment from being blocked.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A multi-stage screening machine comprises a screening device for screening materials; a feeding mechanism for conveying materials to the screening device; a discharging mechanism for receiving the screened materials; and a frame for sequentially installing the feeding mechanism, the screening device and the discharging mechanism; the screening device comprises a plurality of groups of roller assemblies for screening materials, the plurality of groups of roller assemblies are sequentially arranged from the feeding mechanism to the discharging mechanism, and are sequentially reduced in height in the vertical direction to form a stepped arrangement.

[0008] Furthermore, the roller assembly includes at least two rollers that are parallel to each other and rotate in the same direction. The rollers are provided with separation ring plates that protrude radially. The separation ring plates are evenly and spaced apart along the axial direction of the rollers. A hollow portion is formed between adjacent rollers and separation ring plates for the separated materials to fall.

[0009] Furthermore, the rollers in the roller assembly are arranged horizontally, and the axial direction of the rollers is perpendicular to the connection direction of the feeding mechanism and the discharging mechanism, and the most downstream roller of each group of roller assemblies is arranged on the upper side of the most upstream roller of the adjacent lower-level roller assembly; preferably, the most upstream roller of the uppermost roller assembly is arranged on the lower side of the feeding mechanism, and the most downstream roller of the lowermost roller assembly is arranged on the upper side of the discharging mechanism.

[0010] Furthermore, the separation ring plate is a disc structure, and the outer periphery of the separation ring plate is provided with a plurality of radially protruding and evenly arranged shifting teeth; preferably, the shifting teeth include a plane and an arcuate surface, the extension direction of the plane passes through the central axis of the separation ring plate, and the arcuate surface is inclined from the outer periphery of the separation ring plate to protrude away from the separation ring plate and extend to intersect with the plane, and the shifting teeth are connected end to end in sequence around the outer periphery of the separation ring plate, and the roller rotates along the direction of the shifting teeth.

[0011] Furthermore, a middle spacer sleeve is installed between adjacent separation ring plates, and the middle spacer sleeve is detachably fixed on the roller, so that the distance between the separation ring plates can be adjusted to change the size of the hollow portion.

[0012] Furthermore, the separation ring plates on adjacent rollers are aligned and arranged in a direction perpendicular to the axial direction of the rollers, and an adjustable gap is provided between the separation ring plates at relative positions of adjacent rollers.

[0013] Furthermore, the separation ring plates on adjacent rollers are arranged in an interlaced manner, the separation ring plates protrude and extend radially outward from the outer circumference of the roller, and an adjustable gap is provided between the separation ring plates and the adjacent rollers.

[0014] Furthermore, the roller assembly includes side plates, both ends of the roller are rotatably fixed on the side plates, bearings are installed between the rollers and the side plates, one end of the roller passes through the side plates to be connected to the motor, each roller is installed with a motor, the roller assembly is fixed to the frame via the side plates, and the rollers of each group of roller assemblies are installed horizontally.

[0015] Furthermore, the rollers of the multiple roller assemblies rotate in the same direction, and the side of each roller in contact with the material rotates from the feeding mechanism toward the discharging mechanism.

[0016] Furthermore, a waste mechanism is arranged at the lower side of the screening device, the waste mechanism extends in the horizontal direction, the waste mechanism and the feeding mechanism at least partially overlap in the vertical direction, and the waste mechanism and the discharging mechanism at least partially overlap in the vertical direction.

[0017] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0018] 1. Through the above arrangement, a hollow portion is formed between adjacent rollers and separation ring plates, and broken cigarette debris in the material falls from the hollow portion and is transported away for collection. Qualified materials are input to the next process under the rolling action of the rollers. The present invention can reduce the processing and crushing losses of materials such as tobacco leaves or tobacco stems, and improve the screening efficiency and economic benefits.

[0019] 2. An intermediate sleeve is installed between adjacent separation ring plates. The intermediate sleeve is detachably fixed on the roller. By replacing the intermediate sleeves of different lengths, the distance between adjacent ring plates is adjusted, thereby changing the size of the hollow portion. The distance between adjacent rollers can also be adjusted to change the size of the hollow portion. The distance between adjacent rollers and / or the distance between adjacent separation ring plates on the same roller can be adjusted according to the actual incoming materials and process requirements.

[0020] 3. The separation ring plate is equipped with shifting teeth. When the qualified materials fall between the adjacent rollers, the shifting teeth rotate with the separation ring plate, and one side of the shifting teeth plane will bounce the materials to the downstream roller, preventing the materials from being blocked and preventing the two adjacent rollers from squeezing the qualified materials and dropping them through the hollow parts.

[0021] 4. Multiple groups of roller assemblies are arranged on the frame. The multiple groups of roller assemblies are arranged in sequence from the feeding mechanism to the discharging mechanism, and are arranged in steps with decreasing heights in the vertical direction. The materials pass through the multiple groups of roller assemblies to achieve fine screening of the materials, thereby improving the average screening rate of broken cigarettes and debris.

[0022] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are part of the present invention and 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, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0024] Figure 1 2 is a schematic diagram of the structure of a multi-stage screening machine according to an embodiment of the present invention;

[0025] Figure 2 is a top view of a roller assembly in an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 Cross-sectional view of AA in the middle;

[0027] Figure 4 1 is a top view of a roller assembly in another embodiment of the present invention.

[0028] Description of the main components in the figure: 1. Frame; 2. Feeding mechanism; 30. Side plate; 31. Roller; 32. Middle spacer sleeve; 33. Separation ring plate; 34. Picking teeth; 341. Arc surface; 342. Flat surface; 41. Waste mechanism; 42. Discharging mechanism; 5. Motor; 6. Conveyor belt.

[0029] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1 to 4 As shown, a multi-stage screening machine described in an embodiment of the present invention includes a screening device for screening materials; a feeding mechanism 2 for conveying materials to the screening device; a discharging mechanism 42 for receiving the screened materials; a frame 1 for sequentially installing the feeding mechanism 2, the screening device and the discharging mechanism 42; the screening device includes multiple groups of roller assemblies for screening materials, and the multiple groups of roller assemblies are sequentially arranged from the feeding mechanism 2 to the discharging mechanism 42, and the heights are sequentially reduced in the vertical direction to form a stepped arrangement. The feeding mechanism 2 conveys the materials to the most upstream roller assembly, and the materials run along the roller assemblies at each level to screen the materials, and the qualified materials are conveyed to the discharging mechanism 42.

[0034] In this embodiment, the roller assembly includes at least two rollers 31 which are parallel to each other and rotate in the same direction. The rollers 31 in the roller assembly are arranged horizontally, and the axial direction of the rollers 31 is perpendicular to the connection direction of the feeding mechanism 2 and the discharging mechanism 42. The rollers 31 of each roller assembly contact the material on one side and rotate from the feeding mechanism 2 toward the discharging mechanism 42. The most downstream roller 31 of each group of roller assemblies is arranged above the most upstream roller 31 of the adjacent next-level roller assembly to prevent the lighter material from slipping from one group of rolling assemblies to the next-level rolling assemblies due to external influences, and the sliding trajectory is easily deviated. Preferably, the most upstream roller 31 of the uppermost roller assembly is arranged on the lower side of the feeding mechanism 2, and the most downstream roller 31 of the lowermost roller assembly is arranged on the upper side of the discharging mechanism 42.

[0035] In this embodiment, the roller assembly includes a plurality of rollers 31 arranged in parallel with each other and rotating in the same direction, side plates 30 fixing the two ends of the rollers 31, and a driving motor 5 driving the rollers 31 to rotate. The two ends of the rollers 31 are fixed on the side plates 30 so as to be relatively rotatable. Bearings are installed between the rollers 31 and the side plates 30. The two side plates 30 are parallel to each other and perpendicular to the axial extension direction of the rollers 31. The roller assembly is fixed to the frame 1 through the side plates 30 so that the plurality of rollers 31 are installed horizontally. One end of each roller 31 passes through the side plates 30 and is connected to the driving motor 5. The rotation speed of the rollers 31 is adjusted according to actual conditions. The directions of the rollers 31 are the same, and the side in contact with the material rotates from the feeding mechanism 2 toward the discharging mechanism 42.

[0036] In this embodiment, a separation ring plate 33 protruding in the radial direction is provided on the roller 31. The separation ring plates 33 are evenly and spaced apart along the axial direction of the roller 31. A hollow portion for the separated materials to fall is formed between adjacent rollers 31 and the separation ring plates 33. The separation ring plates 33 on adjacent rollers 31 are relatively arranged in a direction perpendicular to the axial direction of the rotating shaft. An adjustable gap is provided on the outer periphery of the separation ring plates 33 at the relative positions of adjacent rollers 31; or, the separation ring plates 33 on adjacent rollers 31 are staggered, and the separation ring plates 33 protrude and extend radially outward from the outer periphery of the middle spacer sleeve 32, and an adjustable gap is provided between the separation ring plates 33 and the middle spacer sleeve 32 of the adjacent rollers 31.

[0037] In this embodiment, an intermediate sleeve 32 is installed between adjacent separation ring plates 33. The intermediate sleeve 32 is detachably fixed on the roller 31. The intermediate sleeves 32 at relative positions on adjacent rollers 31 and the separation ring plates 33 at both ends of the intermediate sleeves 32 form a hollow portion. Preferably, the lengths of the intermediate sleeves are the same.

[0038] In this embodiment, the distance between adjacent separation ring plates 33 and the distance between adjacent rollers 31 are both adjustable. The distance between adjacent separation ring plates 33 is changed by replacing the intermediate spacer sleeves 32 of different lengths. The distance between adjacent rollers 31 and / or the distance between adjacent separation ring plates 33 on the same roller 31 are adjusted according to the process tasks and process indicators in the actual production process to adjust the size of the hollow portion surrounded by adjacent rollers 31 and adjacent separation ring plates 33.

[0039] In this embodiment, the separation ring plate 33 is a disc structure, and a shifting tooth 34 is provided on the outer periphery of the separation ring plate 33. The shifting tooth 34 is provided with a plane 342 passing through the central axis of the separation ring plate 33 and an arc surface 341. The arc surface 341 is inclined from the outer periphery of the separation ring plate 33 to protrude away from the central axis of the separation ring plate 33 and intersects with the plane 342. A plurality of identical shifting teeth 34 are provided on the separation ring plate 33, and each shifting tooth 34 is connected end to end in sequence around the circumference of the separation ring plate 33. The roller 31 rolls along the shape of the shifting tooth 34, that is, the rotation direction of the roller 31 is the same as the inclined extension direction of the arc surface 341. When qualified materials fall between adjacent rollers 31, the shifting tooth 34 rotates with the separation ring plate 33, and one side of the plane 342 of the shifting tooth 34 bounces the materials onto the downstream roller 31, thereby preventing the materials from being blocked and preventing the two adjacent rollers 31 from squeezing the qualified materials and dropping them through the hollow parts.

[0040] In the above arrangement, 4 to 16 shifting teeth 34 may be provided on the outer circumference of the separation ring plate 33 . Preferably, 8 shifting teeth 34 are provided on the outer circumference of the separation ring plate 33 .

[0041] In this embodiment, a waste mechanism 41 is arranged at the lower side of the screening device, and the waste mechanism 41 extends in the horizontal direction. The waste mechanism 41 and the feeding mechanism 2 at least partially overlap in the vertical direction, and the waste mechanism 41 and the discharging mechanism 42 at least partially overlap in the vertical direction, so as to prevent the material from sliding to the ground from the connection between the discharging mechanism 42 and the screening device, or from the connection between the screening device and the discharging mechanism 42.

[0042] In this embodiment, each roller assembly includes three rollers 31 parallel to each other. According to actual conditions, the number of rollers 31 is not limited to the number shown in the figure. Three groups of roller assemblies are installed on the frame 1 to form a three-stage screening machine. According to actual conditions, the number of screening devices is not limited to the number shown in the figure. Generally, 1 to 6 groups of roller assemblies can be set on a multi-stage screening machine, and each roller assembly is arranged in a stepped manner to perform fine screening on the material.

[0043] In this embodiment, the end of each roller 31 passes through the side plate 30 and is connected to the motor 5, and each roller 31 is respectively installed with the motor 5. Figure 2 shown.

[0044] In this embodiment, the roller 31 at the outermost side of the roller assembly is connected to the motor 5. The roller 31 serves as a driving shaft and is connected end to end with other rollers 31 in sequence through a conveyor belt 6. Figure 4 shown.

[0045] In this embodiment, each group of roller assemblies on the frame 1 can be respectively installed with a motor 5, or one group of roller assemblies can be installed with a motor 5, and this group of roller assemblies is connected with other roller assemblies through a conveyor belt 6.

[0046] In the above arrangement, the feeding mechanism 2 and / or the discharging mechanism 42 may be a vibrating conveying device, a vibrating chute or a belt conveying device, etc.

[0047] The multi-stage screening machine is used in the screening tasks of tobacco, tobacco stems and other materials in the leaf threshing, re-drying production line and silk production line in the tobacco industry. When the multi-stage screening machine is working, the material enters the screening device from the feeding mechanism 2, and the broken tobacco debris in the material falls into the waste mechanism 41 from the gap between the separation ring plate 33 and the adjacent roller 31. The qualified material passes through multiple groups of roller assemblies under the rolling action of the roller 31 and is transported to the discharge mechanism 42.

[0048] Through the above-mentioned arrangement, broken tobacco pieces, broken stem segments and dust in tobacco leaves can be separated, thereby improving the purity of tobacco leaves, reducing the processing and crushing losses of tobacco leaves, tobacco stems and other materials and the dust pollution in the workshop, increasing the average screening rate of broken tobacco debris, and improving screening efficiency and economic benefits.

[0049] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A multi-stage screening machine, comprising: Screening device to screen the materials; The feeding mechanism transports the materials to the screening device; The discharging mechanism receives the screened material; The frame is used to install the feeding mechanism, the screening device and the discharging mechanism in sequence; Features: The screening device comprises a plurality of roller assemblies for screening materials, wherein the plurality of roller assemblies are arranged in sequence from the feeding mechanism to the discharging mechanism, and are arranged in a stepped manner with decreasing heights in the vertical direction; The roller assembly includes at least two rollers which are parallel to each other and rotate in the same direction. The rollers are provided with a plurality of radially protruding separation ring plates. The separation ring plates are evenly and spaced apart along the axial direction of the rollers. The separation ring plates on adjacent rollers are relatively arranged in a direction perpendicular to the axial direction of the rotating shaft. The outer peripheries of the separation ring plates at the relative positions of adjacent rollers are provided with gaps with adjustable distances. The outer peripheries of the separation ring plates are provided with a plurality of radially protruding and evenly arranged shifting teeth. The shifting teeth are provided with a plane passing through the central axis of the separation ring plates and an arc-shaped surface.

2. A multi-stage screening machine according to claim 1, characterized in that: A hollow portion for the separated materials to fall is formed between the adjacent rollers and the separation ring plates.

3. A multi-stage screening machine according to claim 2, characterized in that: The rollers in the roller assembly are arranged horizontally, and the axial direction of the rollers is perpendicular to the connection direction of the feeding mechanism and the discharging mechanism. The most downstream roller of each group of roller assemblies is arranged on the upper side of the most upstream roller of the adjacent next-level roller assembly.

4. A multi-stage screening machine according to claim 3, characterized in that: The most upstream roller of the uppermost roller assembly is arranged on the lower side of the feeding mechanism, and the most downstream roller of the lowermost roller assembly is arranged on the upper side of the discharging mechanism.

5. A multi-stage screening machine according to claim 2, characterized in that: The separation ring plate is a disc structure.

6. A multi-stage screening machine according to claim 5, characterized in that: The arc surface is inclined from the outer circumference of the separation ring plate to a side away from the separation ring plate and extends to intersect with the plane. The shifting teeth are connected end to end in sequence around the outer circumference of the separation ring plate, and the roller rotates along the direction of the shifting teeth.

7. A multi-stage screening machine according to claim 2, characterized in that: A middle spacer sleeve is installed between adjacent separation ring plates, and the middle spacer sleeve is detachably fixed on the roller, so that the distance between the separation ring plates can be adjusted to change the size of the hollow part.

8. A multi-stage screening machine according to claim 1 or 2, characterized in that: The roller assembly includes side plates, both ends of the roller are rotatably fixed on the side plates, bearings are installed between the rollers and the side plates, one end of the roller passes through the side plates to be connected to the motor, each roller is installed with a motor, the roller assembly is fixed to the frame through the side plates, and the rollers of each group of roller assemblies are installed horizontally.

9. A multi-stage screening machine according to claim 8, characterized in that: The rollers of the multiple roller assemblies rotate in the same direction, and the side of each roller in contact with the material rotates from the feeding mechanism toward the discharging mechanism.

10. The multi-stage screening machine according to claim 1, characterized in that: A waste mechanism is arranged at the lower side of the screening device, the waste mechanism extends in the horizontal direction, the waste mechanism and the feeding mechanism at least partially overlap in the vertical direction, and the waste mechanism and the discharging mechanism at least partially overlap in the vertical direction.

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