Screening device with multi-stage screening function
By using a multi-stage screening device and a stirring and vibration structure, the problems of low accuracy and efficiency in traditional tea screening have been solved, achieving efficient and accurate grading and automated screening of tea.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional tea screening methods mostly involve single-layer sieving, which makes it difficult to accurately distinguish different particle sizes and quality grades, resulting in mixed tea grades, low production efficiency, and increased labor costs.
The design incorporates a multi-stage screening device, consisting of three vertically distributed sieve discs with gradually decreasing apertures within the feeding hopper. Combined with a stirring shaft and a vibration structure, this device enables multi-stage screening of tea leaves and prevents clogging.
This enables precise grading of tea leaves, improves screening efficiency and stability, reduces manual intervention and equipment downtime, and lowers production costs.
Smart Images
Figure CN223960008U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refined tea processing technology, specifically a screening device with multi-stage screening function. Background Technology
[0002] Tea, a shrub or small tree, with glabrous young branches, leathery, oblong or elliptic leaves, obtuse or acute at the apex, cuneate at the base, glossy above and glabrous or initially pubescent below, with serrated margins, glabrous petioles, white flowers, sometimes slightly long pedicels, broadly ovate to orbicular sepals, glabrous and persistent, broadly ovate petals, slightly connate at the base, glabrous on the back, sometimes with short pubescence, densely covered with white hairs in the ovary, glabrous style, capsules 3-globose or 1-2-globose, 1.1-1.5 cm high, each capsule containing 1-2 seeds, flowering from October to February of the following year.
[0003] In the process of developing this utility model, the inventors discovered the following problems with the existing technology: 1. Traditional tea screening methods are mostly single-layer sieving, relying solely on the weight of the tea leaves to pass through a single sieve. This makes it difficult to accurately distinguish different particle sizes and quality grades of tea leaves, failing to meet the needs of refined processing of high-quality tea. For example, in cases where it is necessary to separate the buds as premium tea raw materials and to grade tea leaves of different sizes, single-layer sieving can only provide a rough classification, easily leading to mixed tea grades and affecting product quality and market competitiveness; 2. In the traditional screening process, the tea leaves are statically piled on the sieve. Vibration is used for sieving, resulting in a slow passage speed and a long overall screening time, severely impacting production efficiency. Furthermore, fine hairs and impurities in the tea leaves easily adhere to and clog the sieve holes, making the screening process unsmooth and requiring frequent machine stops to clean the sieve, further reducing work efficiency and increasing labor and time costs. Utility Model Content
[0004] The purpose of this utility model is to provide a screening device with multi-stage screening function to solve the problem that the tea screening methods mentioned in the background art are mostly single-layer sieving, relying solely on the weight of the tea leaves to pass through a single sieve, making it difficult to accurately distinguish different particle sizes and quality grades of tea leaves, and failing to meet the needs of refined processing of high-quality tea. To achieve the above objective, this utility model provides the following technical solution: a screening device with multi-stage screening function, including a dispensing barrel, with a base plate below the dispensing barrel;
[0005] The housing of the second motor is screwed onto the top of the dispensing hopper. A feed inlet is welded onto the top of the dispensing hopper. The second motor is screwed onto the top of the dispensing hopper. A stirring shaft is screwed onto the output shaft below the second motor. Silica gel blades are inserted into the outer wall of the stirring shaft. A sieve plate is screwed onto the inside of the dispensing hopper. A discharge port is provided on one side of the dispensing hopper. A guide plate is attached to the outer wall of the stirring shaft.
[0006] The housing of a first motor is mounted on top of the chassis via screws. The shaft of a first pulley is mounted on the front output shaft of the first motor via screws. A first support base is mounted on the rear of the housing of the first pulley via screws. The first pulley and a second pulley are connected by a drive belt to form a belt drive. A rotating shaft is mounted on the rear shaft of the second pulley via screws. A cam is rotatably connected to the rear of the rotating shaft. A support plate is attached to the top of the cam. A slide rod is attached to the inside of the support plate. A spring is mounted on the bottom of the support plate via screws. A second support base is rotatably connected to the rear of the rotating shaft.
[0007] More preferably, the stirring shaft forms a rotating structure via a second motor, and the silicone blades also form a rotating structure via the stirring shaft.
[0008] More preferably, the inside of the material distribution bucket has three vertically distributed sieve discs, and the holes and grooves of the three sieve discs gradually decrease in size. The upper sieve disc and the middle sieve disc are inclined at an angle, while the lower sieve disc is at a straight angle.
[0009] More preferably, the outer wall of the material distribution hopper is provided with three discharge ports, with the upper discharge port and the lower discharge port being vertically distributed on one side of the material distribution hopper, and the middle discharge port being distributed at the rear of the material distribution hopper. The upper discharge port and the middle discharge port are symmetrical to the discharge positions of the upper sieve plate and the middle sieve plate, respectively, and the lower discharge port is symmetrical to the discharge position of the guide plate, and the guide plate is inclined.
[0010] More preferably, the first pulley forms a rotating structure via the first motor, the drive belt forms a rotating structure via the first pulley, the second pulley forms a rotating structure via the drive belt, the rotating shaft forms a rotating structure via the second pulley, and the cam forms a rotating structure via the rotating shaft.
[0011] More preferably, the support plate forms a vertical sliding structure with a cam and a spring.
[0012] More preferably, the support plate has two sets of springs symmetrically distributed on both sides, with each set consisting of three springs.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] In this invention, three sieve discs are vertically distributed inside the material distribution hopper, with the apertures of the three sieve discs gradually decreasing in size. The upper and middle sieve discs are at an inclined angle, while the lower sieve disc is at a straight angle. This design creates a sophisticated multi-stage screening system. The sieve discs with different apertures are responsible for retaining tea leaves of different particle sizes. The upper sieve disc with a larger aperture initially filters out the largest impurities in the tea leaves, such as long tea stems. The middle sieve disc with a slightly smaller aperture further filters out medium-sized tea leaves, separating the finer tea leaves from the relatively intact leaves. The lower sieve disc with the smallest aperture retains the most tender tea leaves, such as buds. This system can separate tea leaves into multiple grades at once, accurately selecting tea leaves that meet different quality standards, greatly improving the accuracy of tea screening, meeting diverse market demands, and increasing product added value.
[0015] In this invention, the stirring shaft, via a second motor, forms a rotating structure, and the silicone blades, via the stirring shaft, also form a rotating structure. This ensures the tea leaves are thoroughly agitated and stirred within the distribution bin, allowing them to fully contact the sieve disc and accelerating the screening process. Furthermore, the first pulley, via a first motor, forms a rotating structure, as do the drive belt, the second pulley, and the rotating shaft. A cam, via the rotating shaft, also forms a rotating structure. Combined with a support plate that uses a cam and spring to form a vertical sliding structure, and multiple sets of springs, this causes the distribution bin to vibrate. The combination of stirring and vibration effectively prevents the tea leaves from clogging the sieve holes. The tea leaves are in a "jumping" state on the sieve, reducing clogging and allowing them to pass smoothly and continuously through the sieve holes. This improves the stability and continuity of the screening process, significantly increasing screening efficiency, reducing manual intervention and downtime for cleaning, and lowering production costs. Attached Figure Description
[0016] Figure 1 This is a front view structural diagram of the present invention;
[0017] Figure 2 This is a side view of the structure of this utility model;
[0018] Figure 3 This is a schematic diagram of the internal structure of the material dispensing bin of this utility model;
[0019] Figure 4 This is a schematic diagram of the structure above the chassis of this utility model.
[0020] In the diagram: 1. Distributor bucket; 101. Guide plate; 102. Feed inlet; 103. Second motor; 104. Discharge outlet; 105. Stirring shaft; 106. Silica gel blades; 107. Sieve plate; 2. Chassis; 201. First motor; 202. First pulley; 203. Spring; 204. First support seat; 205. Drive belt; 206. Second support seat; 207. Rotating shaft; 208. Slide rod; 209. Support plate; 210. Cam; 211. Second pulley. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figures 1 to 4 This utility model provides a technical solution: a screening device with multi-level screening function, including a material distribution bin 1, and a base plate 2 is provided below the material distribution bin 1;
[0023] The housing of the second motor 103 is screwed onto the top of the dispensing hopper 1. A feed inlet 102 is welded onto the top of the dispensing hopper 1. The second motor 103 is screwed onto the top of the dispensing hopper 1. A stirring shaft 105 is screwed onto the output shaft below the second motor 103. A silicone blade 106 is inserted into the outer wall of the stirring shaft 105. A sieve plate 107 is screwed onto the inside of the dispensing hopper 1. A discharge port 104 is provided on one side of the dispensing hopper 1. A guide plate 101 is attached to the outer wall of the stirring shaft 105.
[0024] The housing of the first motor 201 is mounted on the top of the chassis 2 with screws. The shaft of the first pulley 202 is mounted on the front output shaft of the first motor 201 with screws. The first support seat 204 is mounted on the rear of the housing of the first pulley 202 with screws. The first pulley 202 and the second pulley 211 are connected by a drive belt 205 to form a belt drive. The shaft of the second pulley 211 is mounted on the rear shaft with screws. The cam 210 is rotatably connected to the rear of the rotating shaft 207. The support plate 209 is attached to the top of the cam 210. The slide rod 208 is attached to the inside of the support plate 209. The spring 203 is mounted on the bottom of the support plate 209 with screws. The second support seat 206 is rotatably connected to the rear of the rotating shaft 207.
[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the stirring shaft 105 forms a rotating structure through the second motor 103, and the silicone blades 106 also form a rotating structure through the stirring shaft 105. The second motor 103 serves as a power source, driving the stirring shaft 105 to rotate. The rotation of the stirring shaft 105, in turn, drives the silicone blades 106 to rotate synchronously, allowing the tea leaves in the distribution tank 1 to be fully agitated and stirred. During the tea screening process, the tea leaves are kept in a dynamic state, avoiding static accumulation and ensuring that the tea leaves come into contact with the sieve plate 107 from all directions, thus improving screening efficiency. Compared with the traditional single-layer tea screening without a stirring device, this dynamic stirring greatly improves the screening effect. In the traditional method, the tea leaves rely solely on their own gravity to slowly pass through the sieve, which can easily lead to clogging of the sieve holes and uneven screening. Through rotational stirring, the movement trajectory of the tea leaves in the distribution tank 1 becomes complex and diverse. For example, the rotation of the silicone blades 106 can turn the tea leaves at the bottom to the top, greatly increasing the probability of contact between the tea leaves and the sieve plate 107, accelerating the screening process, reducing the overall screening time, and making the tea screening more efficient and thorough.
[0026] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the inside of the feeding hopper 1 has three vertically distributed sieve discs 107, with the apertures of the three sieve discs 107 gradually decreasing in size. The upper and middle sieve discs 107 are at an inclined angle, while the lower sieve disc 107 is at a straight angle. The three sieve discs 107 form a multi-stage screening system. The sieve discs 107 with different apertures are responsible for retaining tea leaves of different particle sizes. The upper sieve disc 107 with a larger aperture initially filters out the coarsest impurities in the tea leaves, such as long tea stems. The middle sieve disc 107 with a slightly smaller aperture further filters out medium-sized tea leaves, separating the finer tea leaves from the relatively intact leaves. The lower sieve disc 107 with the smallest aperture retains the most tender tea leaves. For example, the sieving discs 107 at the top and middle of the inclined angle help the trapped material slide down the plate surface for easy collection. The flat lower sieving disc 107, combined with the guide plate 101, can accurately control the discharge direction of the most tender tea leaves. Compared with traditional single-layer sieving, multi-stage sieving achieves fine grading of tea leaves. Traditional single-layer sieves can only perform simple coarse-fine separation and cannot meet the diverse quality grading requirements of tea leaves. This method can divide tea leaves into multiple grades at one time. For example, it can accurately screen out buds that meet the standards of premium tea, first-grade tea leaves, and coarse and old tea leaves that need further processing. This greatly improves the accuracy of tea leaf screening, enhances product quality, and meets the quality requirements of different consumer markets.
[0027] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the outer wall of the distributing tank 1 has three discharge ports 104. The upper discharge port 104 and the lower discharge port 104 are vertically distributed on one side of the distributing tank 1, and the middle discharge port 104 is distributed at the rear of the distributing tank 1. The upper discharge port 104 and the middle discharge port 104 are symmetrical to the discharge positions of the upper sieve plate 107 and the middle sieve plate 107, respectively. The lower discharge port 104 is symmetrical to the discharge position of the guide plate 101, and the guide plate 101 is inclined. The discharge ports 104 are reasonably distributed according to the layout of the sieve plate 107 and the position of the guide plate 101 to ensure that tea of different grades can flow smoothly from the corresponding discharge port 104. The upper discharge port 104 receives the tea from the upper sieve plate 107. The coarse impurities screened by the sieve 107 are collected at the middle discharge port 104, while the medium-sized tea leaves retained by the sieve 107 are collected at the lower discharge port 104 with the assistance of the inclined guide plate 101. This achieves automated discharge. Traditionally, after single-layer sieving, it is necessary to manually sort and collect tea leaves of different sizes, which consumes a lot of manpower and time. With the multi-stage sieve 107, the entire tea screening process is automated. Tea leaves of different grades are automatically separated and collected without manual intervention. This not only reduces labor costs but also improves production efficiency, ensures the continuity of tea leaves in the screening process, and avoids secondary contamination of tea leaves caused by manual operation.
[0028] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, the first pulley 202 forms a rotating structure via the first motor 201, and the drive belt 205 forms a rotating structure via the first pulley 202. The second pulley 211 forms a rotating structure via the drive belt 205, and the rotating shaft 207 forms a rotating structure via the second pulley 211. The cam 210 also forms a rotating structure via the rotating shaft 207. The first motor 201 drives the first pulley 202 to rotate, and the drive belt 205 transmits power to the second pulley 211, thereby driving the rotating shaft 207 and the cam 210 to rotate. The rotation of the cam 210 causes the dispensing hopper 1 to vibrate. The key element of the vibration mechanism is that it periodically lifts the support plate 209, causing the distribution bucket 1 to vibrate vertically. Compared with traditional single-layer sieving without vibration assistance, vibration can effectively prevent tea leaves from clogging the sieve holes of the sieve plate 107. During static sieving, fine hairs and powder in the tea leaves easily adhere to the sieve screen, clogging the sieve holes and reducing sieving efficiency. However, the vibration structure in this paper causes the distribution bucket 1 to vibrate continuously during the sieving process, and the tea leaves are in a "jumping" state on the sieve screen, reducing clogging and allowing the tea leaves to pass through the sieve holes smoothly and continuously, improving the stability and continuity of sieving and ensuring that the sieving work is carried out efficiently.
[0029] In this embodiment, as Figure 1 , Figure 2 and Figure 4As shown, the support plate 209 forms a vertical sliding structure with the cam 210 and the spring 203. The rotation of the cam 210 drives the support plate 209 to reciprocate vertically. When the protruding part of the cam 210 contacts the support plate 209, it pushes it upward, at which time the spring 203 is compressed. When the protruding part of the cam 210 rotates away, the spring 203 returns to its original position by its own elasticity, driving the support plate 209 to fall back. This process is repeated to achieve the vertical sliding of the support plate 209, thereby driving the dispensing barrel 1 to vibrate. This structural design cleverly transforms the rotational motion of the cam 210 into the vertical vibration of the dispensing barrel 1. Compared with directly using a rigid connection to drive the vibration of the dispensing barrel 1, the buffering effect of the spring 203 makes the vibration more stable and gentle, avoiding damage to the equipment caused by violent vibration. It also reduces excessive impact on the tea leaves, protects the quality of the tea leaves, and extends the service life of the equipment.
[0030] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, two sets of springs 203 are symmetrically distributed on both sides of the support plate 209, with three springs in each set. The multiple sets of springs 203 are evenly distributed on both sides of the support plate 209, jointly undertaking the functions of buffering and support. During the lifting and lowering of the cam 210, the springs 203 work together to ensure the stability of the vertical sliding of the support plate 209, making the vibration of the distributing barrel 1 more uniform and stable. Compared with the use of a small number of springs 203 or an asymmetrical arrangement of springs 203, the design of multiple sets of symmetrical springs 203 further optimizes the vibration effect. On the one hand, the sufficient number of springs 203 can better disperse the pressure, cope with the frequent impact of the cam 210, reduce the risk of fatigue damage of a single spring 203, and improve the reliability of the equipment. On the other hand, the symmetrical distribution ensures that the support plate 209 is subjected to uniform force, avoiding the tilting and shaking of the distributing barrel 1 due to uneven force, thereby ensuring the stability of the equipment operation during the tea screening process and improving the screening quality.
[0031] The method of use and advantages of this utility model: The screening device with multi-level screening function operates as follows:
[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, first open the protective cover of the feed inlet 102, and slowly pour an appropriate amount of tea leaves to be screened into the distribution tank 1. During the pouring process, be careful to avoid spilling the tea leaves, and do not pour in too much at once to prevent exceeding the equipment's processing capacity. Turn on the second motor 103, and its output shaft will drive the stirring shaft 105 to start rotating. Since the outer wall of the stirring shaft 105 is fitted with silicone blades 106, the silicone blades 106 rotate accordingly, gently stirring the tea leaves. Under the stirring action, the tea leaves move fully within the distribution tank 1, contacting the three vertically distributed sieve discs 107 in sequence. The slots of the three sieve discs 107 gradually decrease in size. The upper and middle sieve discs 107 are inclined, while the lower sieve disc 107 is at a straight angle. Therefore, larger tea stems, yellow leaves, and other impurities will remain in the upper sieve disc 107, medium-sized ordinary tea leaves will remain in the middle sieve disc 107, and more delicate tea buds will pass through the lower sieve disc 107. The tea stems and other impurities remaining on the inclined upper sieve disc 107 will flow down the inclined surface of the sieve disc 107 and exit from the corresponding upper discharge port 10 on the outer wall of the distribution hopper 1. 4. Outflow: A collection container can be placed below the discharge port 104 for collection. Ordinary tea leaves on the inclined sieve plate 107 in the middle will flow out from the corresponding middle discharge port 104 and be collected. Tender tea leaves on the flat sieve plate 107 below will flow out from the lower discharge port 104 under the action of the inclined guide plate 101, and will also be collected in a container. During the tea screening process, the first motor 201 is started while feeding more material. The output shaft of the first motor 201 drives the first pulley 202 to rotate. The first pulley 202 drives the second belt through the drive belt 205. When wheel 211 rotates, the shaft behind the second pulley 211 drives the rotating shaft 207 to rotate, and the cam 210 behind the rotating shaft 207 also rotates. When the cam 210 rotates, it pushes up the support plate 209 that is attached to it. The spring 203 under the support plate 209 is compressed. When the cam 210 rotates away, the spring 203 returns to its original position, causing the support plate 209 to slide up and down, thereby causing the entire distributing barrel 1 to vibrate. This vibration can effectively prevent tea leaves from clogging in the holes and grooves of the sieve plate 107, making the screening process smoother and improving the screening effect.
[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A screening device with multi-stage screening function, comprising a dispensing hopper (1), characterized in that: The material distribution hopper (1) is provided with a base plate (2) below it; The housing of the second motor (103) is installed on the top of the dispensing hopper (1) by screws. The inlet (102) is welded on the top of the dispensing hopper (1). The second motor (103) is installed on the top of the dispensing hopper (1) by screws. The output shaft of the second motor (103) is installed with a stirring shaft (105) by screws. The outer wall of the stirring shaft (105) is fitted with a silicone blade (106). The inside of the dispensing hopper (1) is fitted with a sieve plate (107) by screws. The dispensing hopper (1) has an outlet (104) on one side. The outer wall of the stirring shaft (105) is fitted with a guide plate (101). The housing of a first motor (201) is mounted on the top of the chassis (2) by screws. The shaft of a first pulley (202) is mounted on the front output shaft of the first motor (201) by screws. A first support base (204) is mounted on the rear of the housing of the first pulley (202) by screws. The first pulley (202) and the second pulley (211) are connected by a drive belt (205) to form a belt drive. A rotating shaft (207) is mounted on the rear shaft of the second pulley (211) by screws. A cam (210) is rotatably connected to the rear of the rotating shaft (207). A support plate (209) is attached to the top of the cam (210). A slide rod (208) is attached to the inside of the support plate (209). A spring (203) is mounted on the bottom of the support plate (209) by screws. A second support base (206) is rotatably connected to the rear of the rotating shaft (207).
2. The screening device with multi-level screening function according to claim 1, characterized in that: The stirring shaft (105) forms a rotating structure via the second motor (103), and the silicone blades (106) also form a rotating structure via the stirring shaft (105).
3. The screening device with multi-level screening function according to claim 1, characterized in that: The material distribution bucket (1) has three vertically distributed sieves (107) inside, and the holes and grooves of the three sieves (107) gradually decrease in size. The upper sieve (107) and the middle sieve (107) are inclined at an angle, while the lower sieve (107) is straight at an angle.
4. The screening device with multi-level screening function according to claim 1, characterized in that: The outer wall of the material distribution bucket (1) is provided with three discharge ports (104), and the upper discharge port (104) and the lower discharge port (104) are vertically distributed on one side of the material distribution bucket (1), and the middle discharge port (104) is distributed at the rear of the material distribution bucket (1). The upper discharge port (104) and the middle discharge port (104) are symmetrical to the discharge positions of the upper sieve plate (107) and the middle sieve plate (107), respectively. The lower discharge port (104) is symmetrical to the discharge position of the guide plate (101), and the guide plate (101) is inclined.
5. The screening device with multi-level screening function according to claim 1, characterized in that: The first pulley (202) forms a rotating structure through the first motor (201), and the drive belt (205) forms a rotating structure through the first pulley (202), and the second pulley (211) forms a rotating structure through the drive belt (205), and the rotating shaft (207) forms a rotating structure through the second pulley (211), and the cam (210) forms a rotating structure through the rotating shaft (207).
6. The screening device with multi-level screening function according to claim 1, characterized in that: The support plate (209) forms a vertical sliding structure with the spring (203) via the cam (210).
7. The screening device with multi-level screening function according to claim 1, characterized in that: The support plate (209) has two sets of springs (203) symmetrically distributed on both sides, each set consisting of three springs (203).