A vibratory gyratory sifting and rejecting device
By designing a vibrating rotary screening device, which combines a rotating roller belt and an excitation mechanism, efficient separation of stem crimps in tobacco stems is achieved. This solves the problem of easy wear and tear on equipment during processing, improves processing efficiency and product quality, and reduces equipment costs and maintenance difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAHUAN INT TOBACCO
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies struggle to efficiently separate the stem hooks from tobacco stems, leading to wear and tear on equipment during subsequent processing, which affects processing efficiency and product quality. Furthermore, existing equipment is costly and difficult to maintain.
Design a vibrating rotary screening device, which adopts a rotating roller belt structure and excitation mechanism. Screening is carried out through the plane and upward inclined surface of the rotating roller belt. Combined with damping dampers and observation windows, it can achieve efficient screening of the chute and stable operation of the equipment.
It improves the screening efficiency of tobacco stems, reduces the rate of incorrect and missed rejection, extends the service life of the equipment, adapts to the differentiated needs of tobacco stems in different production areas, and reduces dust dispersion and maintenance difficulty.
Smart Images
Figure CN224525208U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tobacco processing technology, specifically to a vibrating rotary screening device for removing stem twists from tobacco stems. Background Technology
[0002] Tobacco stems, the main veins of tobacco leaves, account for approximately 25%-30% of the weight of raw tobacco and are an important tobacco resource. In tobacco processing, after appropriate processing such as expansion and shredding, tobacco stems can be used as raw materials in some cigarette formulations, effectively reducing raw material costs.
[0003] Tobacco stems are heterogeneous, with significant differences in characteristics between different parts, especially the "stem bend." Physically, the stem bend is characterized by its large volume, high density, uneven size, high hardness, and poor toughness. Due to its dense structure, the stem bend is difficult to moisten and expand during subsequent processing, easily causing wear and impact damage to the pressure rollers of stem pressing machines and the blades of shredders, making the processing and utilization of tobacco stems difficult. Furthermore, the poor toughness of the stem bend results in short, fragmented stem strands with high powder content, poor shape, and low filling value. In addition, chemically, the stem bend has extremely high lignin and cellulose content, and low content of beneficial components such as pectin, sugars, and nitrogenous compounds. When burned, it easily produces a burning sensation, woody odor, and other off-flavors, affecting the smoking quality. Therefore, in the tobacco stem processing process, removing low-value, high-harm stem bends and processing only the remaining target stems is the ideal way to utilize tobacco stems.
[0004] In existing technologies, stem clippings and target stems are mainly separated based on differences in their physical dimensions (width, thickness) and shape. Commonly used separation equipment includes planar vibrating screens, drum-type rotating screens, and photoelectric imaging rejection screens. Among them, planar vibrating screens use a fixed screening system, which is prone to stem clogging and difficulties in automatic cleaning. Drum-type rotating screens use gravity to propel the stems spirally within the drum, improving the stem clogging situation compared to planar vibrating screens. However, because the screen surface is mostly enclosed, external stem clogging and equipment maintenance are quite difficult with drum-type rotating screens. Photoelectric imaging rejection screens use image processing technology to locate and remove stem clippings. However, the technology is not yet fully mature, and there are still technical challenges in the production line application of stem image processing and stem clipping removal. Moreover, the equipment is costly and requires professional personnel for debugging and maintenance. Utility Model Content
[0005] This invention provides a vibrating rotary screening and rejection device to avoid the shortcomings of the existing technology.
[0006] The present invention adopts the following technical solution to solve the technical problem: a vibrating rotary screening and rejection device, wherein the upper frame is elastically installed and connected to the top of the lower frame, and a screening section with closed sides and top is formed between the two. A rotating roller mechanism, a vibration mechanism, a discharge mechanism and a damping damper are provided in the screening section. The roller mechanism includes a side plate, a roller, a chain, a drive wheel, a reversing wheel, and a positioning sleeve; The rotating rollers, each fitted with a positioning sleeve in the middle, are arranged in a densely packed manner with their axes parallel. A pair of chains are respectively installed and fixed to both ends of each rotating roller, forming a closed annular belt structure of the rotating roller belt. The positioning sleeve is axially limited on the rotating roller, and adjacent positioning sleeves are pressed together to form a sieve hole between adjacent rotating rollers. The drive wheel and the reversing wheel are symmetrically arranged in pairs on both sides of the rotating belt, and are rotatably connected to a pair of side plates arranged on both sides of the rotating belt. The side plates are fixedly installed to the upper frame. The rotating belt is tensioned on the drive wheel and each of the reversing wheels, and can rotate around the drive wheel and each of the reversing wheels under the action of the drive wheel which is externally connected to the rotating belt motor. The top surface of the rotating belt has a shape in which a plane and at least one upward inclined surface are arranged in sequence along its own direction of movement. The fixed end of the excitation mechanism is fixedly installed to the upper frame, and its output end contacts the rotating roller belt; the top and bottom surfaces of the rotating roller belt and the bottom of the rotating roller belt are respectively connected to the discharge mechanism, which is used to convey the materials screened and removed by the rotating roller belt; The rotating roller belt is symmetrically and evenly distributed with damping dampers on both sides. The upper frame and the lower frame are elastically connected by each of the damping dampers. The screening section is provided with transparent observation windows on both sides of the upper frame and / or the lower frame.
[0007] Furthermore, each of the planes and each of the upward slopes is provided with a corresponding excitation mechanism serving as a screening drive mechanism; The excitation mechanism includes an excitation base, an excitation bracket, an excitation motor, and a contact plate; the contact plate and the excitation motor are both mounted and fixed on the excitation bracket, and the excitation bracket is mounted and fixed to the upper frame through the excitation base, which serves as the fixed end of the excitation mechanism; The contact plate of the screening drive mechanism serves as the output end of the excitation mechanism. It is located above the plane or the upward slope and can periodically contact at least one of the positioning sleeves in a corresponding plane or upward slope under the action of the excitation motor.
[0008] Furthermore, a vibration mechanism serving as a screening drive mechanism is provided below the rotating roller belt; The contact plate of the screening drive mechanism serves as the output end of the excitation mechanism. It is located below the bottom surface of the rotating roller belt and can periodically contact at least one of the positioning sleeves inside the bottom surface of the rotating roller belt under the action of the excitation motor.
[0009] Furthermore, the excitation mechanism also includes a flexible connection portion; The vibration support and the vibration base are connected by the flexible connection part.
[0010] Furthermore, the excitation mechanism is provided with a pair of parallel excitation brackets. The excitation brackets are U-shaped structures with the middle part bent towards the rotating roller belt. An excitation base is fixedly installed at each of its two ends, and the flexible connecting part is placed between the end and the excitation base. The excitation motor is located between the pair of excitation brackets and is fixedly installed in the middle of the pair of excitation brackets.
[0011] Furthermore, the end of the contact plate that contacts the positioning sleeve is the end, which is a long strip-shaped structure, and its width increases from the front end to the end.
[0012] Furthermore, the roller includes a mandrel and a sleeve; The two ends of the mandrel are respectively fitted with a pair of chains, and the sleeve is fitted onto the outer middle of the mandrel; one of the two ends of the mandrel is provided with a limiting platform for axial limiting, and the other end is fitted with a limiting pin for axial limiting.
[0013] Furthermore, the roller mechanism also includes a tensioning wheel; The tensioning wheels are symmetrically arranged in pairs on both sides of the rotating belt, rotatably connected to the side plate, and tension the rotating belt in the opposite direction to the drive wheel and the reversing wheel.
[0014] Furthermore, the top of the upper frame is provided with an openable maintenance door and a dust removal pipe connected to the screening section; the upper frame has lifting doors on both sides corresponding to the observation window that can be opened by swinging up or closed by swinging down.
[0015] Furthermore, a nitrogen spring is provided between the upper door and the upper frame to keep the upper door in the open state.
[0016] This utility model provides a vibrating rotary screen rejection device, which has the following beneficial effects: 1. The top surface of the rotating roller belt of this utility model is arranged in the form of a plane and at least one upward inclined surface in sequence. The plane facilitates the uniform spreading of tobacco stems under the action of periodic excitation force. The upward inclined surface has an extension effect, which extends the screening path compared with the plane with the same projected length. The upward inclined surface also has a clearing effect. When the screen hole with the embedded stem bend runs to the end of the upward inclined surface, the inclination angle of the rotating roller belt surface near the screen hole generates a gravity-centrifugal force composite decoupling effect, causing the embedded stem bend to disengage from the screen hole and fall down, thereby reducing the false rejection rate of the device and eliminating the reduction in screening efficiency caused by the stem bend sticking to the screen hole, thereby improving the screening effect and ensuring the continuous and stable screening process. It is particularly suitable for screening irregularly shaped stem bends.
[0017] 2. The lower frame and upper frame of this utility model are connected by a damping shock absorber, which effectively isolates vibration transmission, avoids rigid impact, and extends the service life of key components.
[0018] 3. The contact plate of the screening drive mechanism of this utility model adopts a periodic direct contact excitation method to periodically transmit the excitation force to the top surface of the rotating roller belt, thereby enhancing the vibration efficiency during the screening process and improving the screening efficiency of the material.
[0019] 4. The contact plate of the screening drive mechanism of this utility model adopts a periodic direct contact excitation method to periodically transmit the excitation force to the bottom surface of the rotating roller belt, which is used to solve the problem of material sticking in the stalks, so that the stalks stuck in the screen holes can be dislodged from the screen holes and fall to the corresponding discharge mechanism for delivery.
[0020] 5. The rotating roller of this utility model is an interchangeable structure in which the outer sleeve can be separated from the mandrel. The width of the screen hole of the rotating roller belt can be adjusted accordingly by replacing the sleeve with a different outer diameter. When the volume of the tobacco stem and stalk is large (such as screening tobacco stems and stalks in the Huanghuai tobacco region), a sleeve with a smaller outer diameter is used to increase the width of the screen hole. When the volume of the tobacco stem and stalk is small (such as screening tobacco stems and stalks in the southern production area), a sleeve with a larger outer diameter is used to reduce the width of the screen hole. It is particularly suitable for screening tobacco stems and stalks whose morphology is significantly affected by the place of origin. It can better adapt to the differentiated and refined screening needs of tobacco stems and stalks of different production areas and grades.
[0021] 6. The screening section of this utility model adopts a closed structure and is connected to a dust removal pipe, which effectively controls dust dispersion, eliminates the risk of explosion, and reduces occupational health hazards. The observation window facilitates the observation of equipment operation, and the maintenance door and the top-hinged door facilitate maintenance work. The top-hinged door is supported by a nitrogen spring to maintain its open state, further improving the safety and convenience of maintenance work. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2This is a schematic diagram of the rotating roller mechanism, vibration mechanism and discharge mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the roller mechanism and the excitation mechanism of this utility model; Figure 4 This is a schematic diagram of the structure of the roller, chain, and positioning sleeve of this utility model; Figure 5 This is a cross-sectional view of the CC section of this utility model; Figure 6 This is a schematic diagram of the excitation mechanism of this utility model; Figure 7 This is a schematic diagram of the structure of the lifting door and nitrogen spring of this utility model.
[0023] In the picture: 11. Upper frame; 12. Lower frame; 13. Dust removal port; 14. Inspection door; 15. Top-hinged door; 16. Nitrogen spring; 2. Rotary roller mechanism; 21. Rotary roller; 211. Mandrel; 212. Sleeve; 22. Chain; 23. Drive wheel; 24. Reversing wheel; 25. Tensioning wheel; 26. Positioning sleeve; 3. Vibration mechanism; 31. Vibration base; 32. Flexible connection; 33. Vibration bracket; 34. Vibration motor; 35. Contact plate; 5. Discharge mechanism; 6. Damping shock absorber. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] A vibrating rotary screen rejection device, such as Figures 1-7 As shown, its structural relationship is as follows: the upper frame 11 is flexibly connected to the top of the lower frame 12, and a screening section with closed sides and top is formed between the two. The screening section is equipped with a rotating roller mechanism 2, a vibration mechanism 3, a discharge mechanism 5 and a damping shock absorber 6. The roller mechanism 2 includes a side plate, a roller 21, a chain 22, a drive wheel 23, a reversing wheel 24, and a positioning sleeve 26; The rotating rollers 21, each fitted with a positioning sleeve 26, are densely arranged in a parallel manner along their axes. A pair of chains 22 are respectively installed and fixed to both ends of each rotating roller 21, forming a closed annular belt structure. The positioning sleeves 26 are axially limited on the rotating rollers 21. Adjacent positioning sleeves 26 press against each other, forming sieve holes between adjacent rotating rollers 21; The locating sleeves 26 between the rotating rollers 21 are radially positioned by precisely controlling the outer diameter tolerance of ±0.05mm, so as to precisely control the width of the screen holes. The locating sleeves 26 are preferably axially limited on the rotating rollers 21 by snap rings to achieve axial positioning of the locating sleeves 26; the screen hole width is preferably 5mm~7mm. The drive wheel 23 and the reversing wheel 24 are symmetrically arranged in pairs on both sides of the rotating belt, and are rotatably connected to a pair of side plates arranged on both sides of the rotating belt. The side plates are fixedly installed to the upper frame 11. The rotating belt is tensioned on the drive wheel 23 and each reversing wheel 24, and can rotate around the drive wheel 23 and each reversing wheel 24 under the action of the drive wheel 23 which is externally connected to the rotating belt motor. The frequency of the rotating belt motor is preferably 50Hz±2%. The top surface of the rotating belt has a shape in which a plane and at least one upward inclined surface are arranged in sequence along its own direction of movement. The fixed end of the excitation mechanism 3 is installed and fixed to the upper frame 11, and its output end contacts the rotating roller belt; the top and bottom surfaces of the rotating roller belt and the bottom of the rotating roller belt are respectively connected to the discharge mechanism 5, which is used to convey the materials screened and removed by the rotating roller belt. Damping dampers 6 are symmetrically and evenly distributed on both sides of the rotating roller belt. The upper frame 11 and the lower frame 12 are elastically connected through each damping damper 6. Transparent observation windows are provided on both sides of the screening section on the upper frame 11 and / or the lower frame 12.
[0026] Preferably, each plane and each upward inclined plane is provided with a corresponding excitation mechanism 3 as a screening drive mechanism; The excitation mechanism 3 includes an excitation base 31, an excitation bracket 33, an excitation motor 34, and a contact plate 35; the contact plate 35 and the excitation motor 34 are both mounted and fixed on the excitation bracket 33, and the excitation bracket 33 is mounted and fixed to the upper frame 11 through the excitation base 31, which serves as the fixed end of the excitation mechanism 3. The contact plate 35 of the screening drive mechanism serves as the output end of the excitation mechanism 3. It is located above a plane or an upward slope and can periodically contact at least one positioning sleeve 26 in a corresponding plane or upward slope under the action of the excitation motor 34.
[0027] The pendulum angle of the excitation motor 34 is preferably 70°±0.5°, and the frequency is preferably 50Hz±2%.
[0028] Preferably, a vibration mechanism 3 is provided below the rotating roller belt as a screening drive mechanism; The contact plate 35 of the screening drive mechanism serves as the output end of the excitation mechanism 3. It is located below the bottom surface of the rotating roller belt and can periodically contact at least one positioning sleeve 26 inside the bottom surface of the rotating roller belt under the action of the excitation motor 34.
[0029] The contact plate 35 is preferably a nylon contact plate. Nylon material has advantages such as excellent strength, good wear resistance, chemical resistance, high volume resistivity and high breakdown voltage, light weight of parts, and ease of processing.
[0030] Preferably, the excitation mechanism 3 further includes a flexible connection portion 32; A flexible connection part 32 connects the vibration support 33 and the vibration base 31.
[0031] The flexible connection 32 can isolate vibration transmission, reduce structural resonance, absorb excitation energy, and transform the rigid coupling between the excitation mechanism 3 and the upper frame 11 into an elastic buffer connection. This reduces the transmission efficiency of the periodic excitation force to the upper frame 11, and prevents the periodic excitation force generated by the excitation mechanism 3 from being rigidly transmitted to the upper frame 11 and the parts connected to the upper frame 11. This avoids problems such as loosening of threaded connections and cracking of welds caused by overall structural resonance, and helps to extend the service life and maintenance cycle of the device. The flexible connector 32 is preferably a rubber pad.
[0032] Preferably, the excitation mechanism 3 is provided with a pair of parallel excitation brackets 33. The excitation brackets 33 have a U-shaped structure with the middle part bent towards the rotating roller belt. An excitation base 31 is installed and fixed at each of its two ends, and a flexible connecting part 32 is provided between the end and the excitation base 31. The excitation motor 34 is located between a pair of excitation brackets 33 and is fixed to the middle of the pair of excitation brackets 33.
[0033] Preferably, the end of the contact plate 35 that contacts the positioning sleeve 26 is the end, which is a long strip-shaped structure, and its width increases from the front end to the end.
[0034] Preferably, the roller 21 includes a spindle 211 and a sleeve 212; The two ends of the spindle 211 are respectively fitted with a pair of chains 22, and the sleeve 212 is fitted to the outer middle of the spindle 211; one of the two ends of the spindle 211 is provided with a limiting platform for axial limiting, and the other end is fitted with a limiting pin for axial limiting.
[0035] When using a vibrating rotary screen to screen materials, the screen hole width can be adjusted by changing the sleeves of different diameters, thus adapting to the screening needs of different types of materials.
[0036] Preferably, the roller mechanism 2 further includes a tensioning wheel 25; Tensioning wheels 25 are symmetrically arranged in pairs on both sides of the rotating belt, rotatably connected to the side plate, and tension the rotating belt in the opposite direction to the drive wheel 23 and the reversing wheel 24.
[0037] The tensioning pulley 25 is preferably located in the middle of the bottom surface of the rotating belt and tensions the rotating belt from bottom to top.
[0038] Preferably, the top of the upper frame 11 is provided with an openable maintenance door 14 and a dust removal pipe 13 connected to the screening section; the upper frame 11 has upper lifting doors 15 on both sides corresponding to the observation window, which can be opened by swinging up or closed by swinging down.
[0039] Preferably, a nitrogen spring 16 is provided between the upper door 15 and the upper frame 11 to keep the upper door 15 in the open state.
[0040] In practical use, the following process is included: The first step is to select a sleeve 212 with a suitable outer diameter according to the size and shape of the material to be screened, and to install or replace each sleeve 212 on the roller belt.
[0041] In the second step, the tobacco stems enter the rotating roller mechanism from the flat part of the top surface of the rotating roller belt. The flat surface vibrates at a high frequency and low amplitude under the action of the corresponding excitation mechanism 3, so that the tobacco stems are evenly spread on the flat surface and conveyed forward with the movement of the flat surface. During this process, some of the target stems fall through the screen holes in the plane to the corresponding discharge mechanism 5 and are sent to the downstream process.
[0042] The third step is that the tobacco stems follow the plane to the end of the plane and enter at least one upward inclined plane. The upward inclined plane vibrates at a high frequency and low amplitude under the action of the corresponding excitation mechanism 3 to screen the tobacco stems. The target stems are screened and fall through the screen holes in the upward inclined plane to the corresponding discharge mechanism 5 and sent to the downstream process. The screened stems and unscreened tobacco stems are conveyed forward with the movement of the upward inclined plane until the tobacco stems are screened. During this process, when the screen hole with the embedded stem reaches the end of the upward slope (i.e., the highest position of the upward slope), the tilt angle of the roller belt near the screen hole generates a combined decoupling effect of gravity and centrifugal force, causing the embedded stem to disengage from the screen hole and fall.
[0043] In the fourth step, the stem follows the upward slope to the end of the last upward slope, and then most of the stems are separated from the roller belt under the action of gravity and fall to the corresponding discharge mechanism 5 for delivery.
[0044] In the fifth step, a small portion of the stems get stuck in the screen holes and move with the rotating roller belt to below the bottom surface of the rotating roller belt. Under the action of the corresponding excitation mechanism 3, the bottom surface of the rotating roller belt vibrates at a high frequency and low amplitude, causing the stems stuck in the screen holes to disengage from the bottom surface of the rotating roller belt and fall to the corresponding discharge mechanism 5 for delivery.
[0045] In the first step above, the specific method for installing or replacing a single sleeve 212 is as follows: Remove the corresponding limit pin and remove the chain 22 near the limit pin from the spindle 211. If the spindle 211 originally had a sleeve 212 of another size installed on it, the sleeve 212 of another size also needs to be removed. Then, the sleeve 212 of the appropriate size is fitted onto the spindle 211, and the removed chain 22 and the limit pin are reinstalled onto the spindle 211 in sequence.
[0046] Example 1 The existing planar vibrating screen, the cylindrical rolling screen, and the above-mentioned vibrating rotary screen removal device were used to screen out the stem crimps of high-grade tobacco stems from central Sichuan during the 2024 tobacco season. The initial content of stem crimps was 13.94%. In this embodiment, the screen hole width of the vibrating rotary screen removal device was set to 5.4 mm.
[0047] Three sets each of stem samples and target stem samples were collected after screening by a planar vibrating screen, a drum-type rolling screen, and the aforementioned vibrating rotary screening and removal device. These samples were manually sorted and classified into stem and non-stem categories, and weighed (stems connected to the main vein of the tobacco leaf, regardless of length, were counted as stems). The average missed rejection rate and incorrect rejection rate are shown in Table 1 below: Table 1. Screening effect of stem stalks - different equipment *Rejection Rate %: The percentage of the weight of the target stem in the target stem after screening out of the total weight of the target stem sample. *False rejection rate %: The percentage of non-stem weight in the total weight of the skeletal specimens after sieving. As shown in Table 1 above, the residual amount of target stems in the screened material after screening by the above-mentioned vibrating rotary screen removal device was reduced to 3.67% (a reduction of 73.7% compared to the original value), which is significantly better than that of the planar vibrating screen (8.18%) and the drum rolling screen (6.24%). The false rejection rate was controlled at 15.85%, which is a reduction of 72.11% and 42.80% compared to 56.84% for the planar vibrating screen and 27.71% for the drum rolling screen, respectively.
[0048] The missed rejection rate and the false rejection rate indicate that the above-mentioned vibrating rotary screen rejection device has significant benefits in improving the purity of the target stems, reducing raw material loss, and optimizing production sustainability.
[0049] Example 2 Taking the middle-grade tobacco stems from the Sichuan (Southwest tobacco region) and Henan (typical Huanghuai tobacco region) tobacco production areas in the 2024 tobacco season as examples, the practical application evaluation of the above-mentioned vibrating rotary screening and rejection device was carried out under different screen hole widths (i.e., roller spacing).
[0050] The initial content of stem fibrous material in tobacco stems from Sichuan (Southwest tobacco region) and Henan (typical Huanghuai tobacco region) was 13.94% and 20.32%, respectively. Since tobacco stems from the Huanghuai region are larger than those from other regions, the sieve width was designed to be 4.4-6.4 mm for Sichuan tobacco stems and 5.4-7.4 mm for Henan tobacco stems.
[0051] The following table shows the variation of the screening effect of the above-mentioned vibrating rotary screener on the high-quality tobacco stems from Sichuan (Southwest tobacco region) and Henan (typical Huanghuai tobacco region) with the roller spacing: Table 2. Screening effect of stems and stalks - different production areas and different roller spacings As shown in Table 2 above, the vibrating rotary screen removal device can effectively adapt to the physical characteristics of tobacco stems from different producing areas by adjusting the roller spacing, achieving efficient screening of stem culms. Considering both the missed removal rate and the false removal rate, the optimal screen aperture width is 5.4 mm for the Sichuan producing area and 6.4 mm for the Henan producing area. Under the optimal conditions, the missed removal rates of stem culms in the two producing areas are 3.67% and 5.86%, respectively, which are 73.67% and 71.16% lower than the initial content of stem culms in the tobacco stems, respectively. The stem culm removal effect is better, while the false removal rates of 15.85% and 21.61% ensure the economic indicators of the target stems.
[0052] Comparing the application effects of the two production areas, the screening effect of tobacco stems from Henan Province under this equipment was slightly worse than that from Sichuan Province. This is mainly due to the fact that tobacco stems from Henan Province have a lower density and are relatively loose, resulting in a larger volume compared to tobacco stems from Sichuan Province when the processing flow rate is the same. This leads to a larger volume of tobacco stems from Henan Province on a unit length of roller, increasing the thickness of the tobacco stem material layer. In addition, the tobacco stems from Henan Province have a higher stem content. The combination of these factors has a certain impact on the screening effect, resulting in the screening effect of tobacco stems from Henan Province in Example 2 being slightly inferior to that of tobacco stems from Sichuan Province.
[0053] Furthermore, in actual operation, the aforementioned vibrating rotary screening and removal device has demonstrated good screening effect for separating the stems and tangles in tobacco stems from multiple different regions, including Hunan, Fujian, Jiangxi, and Jilin. The equipment operates stably and reliably, further indicating that it has a wide range of adaptability to production areas and process stability.
[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0055] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A vibrating rotary screen rejection device, wherein an upper frame (11) is elastically connected to the top of a lower frame (12), forming a screen section with closed sides and top between the two, characterized in that: The screening area is provided with a rotating roller mechanism (2), a vibration mechanism (3), a discharge mechanism (5) and a damping shock absorber (6). The roller mechanism (2) includes a side plate, a roller (21), a chain (22), a drive wheel (23), a reversing wheel (24), and a positioning sleeve (26). The rotating rollers (21) with the positioning sleeves (26) fitted in the middle are arranged in a parallel manner. A pair of chains (22) are respectively installed and fixed to the two ends of each rotating roller (21) to form a closed ring-shaped belt. The positioning sleeves (26) are axially limited on the rotating rollers (21), and the adjacent positioning sleeves (26) are pressed together to form a sieve hole between the adjacent rotating rollers (21). The drive wheel (23) and the reversing wheel (24) are symmetrically arranged in pairs on both sides of the rotating belt, and are rotatably connected to a pair of side plates arranged on both sides of the rotating belt. The side plates are fixedly installed to the upper frame (11). The rotating belt is tensioned on the drive wheel (23) and each of the reversing wheels (24), and can rotate around the drive wheel (23) and each of the reversing wheels (24) under the action of the drive wheel (23) which is externally connected to the rotating belt motor. The top surface of the rotating belt has a shape that is a plane and at least one upward inclined surface in sequence along its own direction of movement. The fixed end of the excitation mechanism (3) is installed and fixed to the upper frame (11), and its output end contacts the rotating roller belt; the top and bottom surfaces of the rotating roller belt and the bottom of the rotating roller belt are respectively connected to the discharge mechanism (5), which is used to transport the materials screened and removed by the rotating roller belt. Damping dampers (6) are symmetrically and evenly distributed on both sides of the rotating roller belt. The upper frame (11) and the lower frame (12) are elastically connected by each of the damping dampers (6). Transparent observation windows are provided on both sides of the screening section on the upper frame (11) and / or the lower frame (12).
2. The vibrating rotary screen rejection device according to claim 1, characterized in that: Each of the planes and each of the upward slopes is provided with a corresponding excitation mechanism (3) as a screening drive mechanism; The excitation mechanism (3) includes an excitation base (31), an excitation bracket (33), an excitation motor (34), and a contact plate (35); the contact plate (35) and the excitation motor (34) are both mounted and fixed on the excitation bracket (33), and the excitation bracket (33) is mounted and fixed to the upper frame (11) through the excitation base (31) which serves as the fixed end of the excitation mechanism (3); The contact plate (35) of the screening drive mechanism serves as the output end of the excitation mechanism (3), located above the plane or the upward slope, and can periodically contact at least one of the positioning sleeves (26) in a corresponding plane or upward slope under the action of the excitation motor (34).
3. The vibrating rotary screen rejection device according to claim 2, characterized in that: Below the rotating roller belt is an excitation mechanism (3) that serves as a screening drive mechanism; The contact plate (35) of the screening drive mechanism serves as the output end of the excitation mechanism (3), located below the bottom surface of the rotating roller belt, and can periodically contact at least one of the positioning sleeves (26) in the bottom surface of the rotating roller belt under the action of the excitation motor (34).
4. A vibrating rotary screen rejection device according to claim 2 or 3, characterized in that: The excitation mechanism (3) also includes a flexible connection part (32); The flexible connection part (32) connects the vibration support (33) and the vibration base (31).
5. The vibrating rotary screen rejection device according to claim 4, characterized in that: The excitation mechanism (3) is provided with a pair of parallel excitation brackets (33). The excitation brackets (33) are U-shaped structures with the middle part bent towards the rotating roller belt. Each end of the brackets is fixed with an excitation base (31), and a flexible connecting part (32) is provided between the end and the excitation base (31). The excitation motor (34) is located between a pair of excitation brackets (33) and is fixedly installed in the middle of the pair of excitation brackets (33).
6. The vibrating rotary screen rejection device according to claim 3, characterized in that: The end of the contact plate (35) that contacts the positioning sleeve (26) is a long strip-shaped structure, and its width increases from the front end to the end.
7. The vibrating rotary screen rejection device according to claim 1, characterized in that: The roller (21) includes a spindle (211) and a sleeve (212). The two ends of the mandrel (211) are respectively fitted with a pair of chains (22), and the sleeve (212) is fitted to the outer middle of the mandrel (211); one of the two ends of the mandrel (211) is provided with a limiting platform for axial limiting, and the other end is fitted with a limiting pin for axial limiting.
8. The vibrating rotary screen rejection device according to claim 1, characterized in that: The roller mechanism (2) also includes a tensioning wheel (25); The tensioning wheels (25) are symmetrically arranged in pairs on both sides of the rotating belt, rotatably connected to the side plate, and tension the rotating belt in the opposite direction to the drive wheel (23) and the reversing wheel (24).
9. The vibrating rotary screen rejection device according to claim 1, characterized in that: The top of the upper frame (11) is provided with an openable maintenance door (14) and a dust removal pipe (13) connected to the screening section; the upper frame (11) has upper lifting doors (15) on both sides corresponding to the observation window that can be opened by swinging up or closed by swinging down.
10. The vibrating rotary screen rejection device according to claim 9, characterized in that: A nitrogen spring (16) is provided between the upper door (15) and the upper frame (11) to keep the upper door (15) in the open state.