CN113967589A - Tea powder screening device - Google Patents

Abstract

The invention relates to the technical field of tea screening, in particular to a tea powder screening device, which is characterized in that a base, a screening frame, a transmission assembly and a swinging assembly are arranged, so that the screening frame can do simple harmonic motion under the action of the transmission assembly and the swinging assembly, the screening frame can swing back and forth along one direction relative to the base, and the screening frame forms a screening motion state; and the screen assembly is installed and erected on the screen frame, the screen assembly is composed of a powder leaking hopper and a screen, the screen can be overturned along one side edge of the screen frame, so that powder in tea leaves can enter the powder leaking hopper to be discharged in the screen moving process, and the tea leaves are overturned and poured out through the screen, and the separation of powder components in the tea leaves is realized.

Description

Tea powder screening device

Technical Field

The invention relates to the technical field of tea screening, in particular to a tea powder screening device.

Background

In the tea leaf refining process, tea leaves need to be screened so as to screen out dust in the tea leaves and improve the quality of the tea leaves.

At present, the tea screening process adopts the air separator to screen mostly, and the rationale of its realization is: utilize the gravity and the graininess of the difference between piece, dust, the complete granule in the tealeaves to the power condition of wind, realize the distance that piece, dust, complete granule flew out along with the wind, realize separating out dust, piece, guarantee tealeaves quality, for example: the automatic tea winnowing machine with the patent number of 201420474000.0, the Pu' er tea winnowing machine with the patent number of 201520979983.8 and the tea winnowing machine with the patent number of 201721880915.1 all disclose the process of winnowing and removing dust and debris in tea; however, there are still many drawbacks in the application of these winnowing machines, such as: the tea leaves are difficult to be blown off fully, so that scraps, powder, dust and the like mixed in the tea leaves enter the tea leaves, and the quality of the tea leaves is poor. In view of the technical defect, when the research team of our company is in early research, the structure of the air separator is introduced and improved, for example: the tea winnowing machine disclosed in patent No. 202022307079.6 utilizes the air current that the air-blower is blown into in the screening case and the conveyer belt on not mutually perpendicular between the tealeaves of conveying into in the screening case for tealeaves can blow off by the at utmost, improves the selection by winnowing effect.

However, in the tea screening process, besides the wind separation screening mode is adopted by a winnowing machine to realize the screening of dust and debris, the screening process is also realized by adopting a screen structure, and the screening equipment adopted in the process is mainly divided into a single (double) layer shaking screen machine, a plane circular screen machine and the like. Tremble the sieve machine and adopt shock dynamo, realize the sieve vibrations for tealeaves is at screening surface spring mode screening, and it is not only the noise big, and when tealeaves screening moreover, the degree of dryness of tealeaves itself is great, and the fragility is big, makes tealeaves spring screening in-process, and the phenomenon is broken into pieces to tealeaves appears, and the powder volume that causes the screening is great, and fine work tealeaves output rate is lower, and tealeaves added value is lower, and the cost is higher. In view of this, on the basis of earlier stage research, the research team of our company improves to trembling the sieve machine structure, utilizes operation principles such as slip, roll for tealeaves realizes rolling, removal about on the sifter, realizes screening the purpose to tealeaves dust, for example: in the tea screening machine disclosed in patent No. 202022307073.9, a motor is used to drive a pulling rod, so that the pulling rod is pulled back and forth, a screening plate moves back and forth, tea leaves are turned and rolled on the screening plate, and dust is screened; however, the device has unreasonable structure arrangement, so that the motor needs to operate under continuous load, the energy consumption of the motor is high, and the cost of the tea screening, dust removing, powder removing and debris removing processes is high; simultaneously, after accomplishing the tealeaves screening, need take off tealeaves from the sieve, cause and need shut down and get tealeaves, lead to the screening efficiency lower.

Based on this, this researcher is based on improving tealeaves powder screening device structure, adopts drive assembly, swing subassembly, sieve to move frame, base constitution overall structure, and sets up screen assembly on sieving to move the frame, and screen assembly includes the screen cloth and leaks the powder fill, and the screen cloth can overturn, realizes taking out fast of tealeaves, improves screening efficiency, reduces tealeaves screening cost, provides new installation for tealeaves screening.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a tea powder screening device which is simple in structure and convenient to operate, can quickly take out tea leaves through screen overturning, can quickly put the screen back on a screen moving frame to realize stable screening, avoids the defect that dislocation is easily caused between the screen and the screen moving frame after the screen is taken down and put back in a traditional screening structure, enhances the operation convenience in the tea leaf taking-down process, and improves the screening efficiency.

The method is realized by the following technical scheme:

a tea powder screening device comprises a base and a screening frame, wherein the screening frame is parallel to the base and is positioned right above the base; a transmission assembly is arranged between the screening frame and the base, and a swinging assembly is arranged between the screening frame and the side edge of the base; the screening frame can swing back and forth along one direction relative to the base under the combined action of the transmission assembly and the swinging assembly; the screen assembly is arranged on the screening frame and comprises a screen and a powder leakage hopper, and the powder leakage hopper is positioned right below the screen; the screen can be turned over along one side edge of the screen frame.

Through the arrangement of the base, the sieving frame, the transmission assembly and the swinging assembly, the sieving frame can be driven to do simple harmonic motion under the action of the transmission assembly and the swinging assembly, so that the sieving frame can swing back and forth along one direction relative to the base, and the sieving frame is driven to form a sieving motion state; and the screen assembly is installed and erected on the screen frame, the screen assembly is composed of a powder leaking hopper and a screen, the screen can be overturned along one side edge of the screen frame, so that powder in tea leaves can enter the powder leaking hopper to be discharged in the screen moving process, and the tea leaves are overturned and poured out through the screen, and the separation of powder components in the tea leaves is realized.

In order to better simplify the structure of the device, optimize the overall structure of the device and improve the stability of the operation process, preferably, the swing assembly comprises a fixed swing post arranged on the base, a first swing shaft arranged on the side edge of the screen frame and a swing plate arranged between the fixed swing post and the first swing shaft; a second swing shaft is arranged at one side of the bottom of the swing plate, which is positioned on the fixed swing column, the fixed swing column is provided with a through hole, a bearing is arranged in the through hole, and the second swing shaft penetrates through the bearing; a control component is arranged at the end part of the second swing shaft, and the control component can enable the swing plate to swing back and forth; the top of the swing plate is provided with a through hole at the position of the screening frame, a bearing is arranged in the through hole, and the first swing shaft penetrates through the bearing.

In order to ensure that the device can run back and forth, meet the requirement of simple harmonic motion, realize the swinging of the sieving frame to sieve tea powder, simplify a control structure, reduce the preparation cost of the device and ensure the running stability of the device, preferably, the control part comprises a control groove arranged on the fixed swing post and a control plate arranged at the end part of the second swing shaft, the control plate is positioned in the control groove, the control plate can swing along with the rotation of the second swing shaft, and a clearance groove is formed between the top of the control plate and the top of the control groove; and a limiting spring is arranged in the clearance groove, the top of the limiting spring is connected to the top of the control groove, and the bottom of the limiting spring is connected to the top of the control plate. More preferably, the number of the limiting springs is two. More preferably, the control plate is integrally formed with the second swing shaft.

In order to realize the pushing of the sieve moving frame by utilizing the rotation of the motor and enable the sieve screen assembly to form a sieve-like motion state so as to achieve the aim of sieving the tea powder, and in order to simplify the structure of the transmission assembly, preferably, the transmission assembly comprises a motor arranged on the base, a motor shaft connected to the motor and a transmission wheel fixedly arranged on the motor shaft, wherein the transmission wheel is provided with a convex displacement tooth; the screen frame is characterized by also comprising a transmission frame arranged at the bottom of the screen frame, wherein a displacement column is integrally formed at the bottom of the transmission frame, and a displacement end plate is integrally formed on the displacement column; the displacement end plate can with the displacement tooth phase-match contact for the displacement tooth is rotatory when reaching the displacement end plate position, promotes the displacement end plate takes place to remove.

In order to facilitate disassembly, overhaul or replacement and improve the connection stability, preferably, the transmission wheel is fixedly connected with the motor shaft by a fastening piece.

In order to facilitate the overturning of the screen to pour out qualified tea and avoid the separation of the screen assembly and the screen moving frame, preferably, a support frame is arranged on one side edge of the screen moving frame, a fixed frame is arranged on the support frame, and a bearing is arranged on the fixed frame; the bearing is provided with a rotating rod in a penetrating way, a rotating arm is integrally formed on the rotating rod and fixedly connected with the screen, and a rotating wheel is arranged at the end part of the rotating rod; the swiveling wheel can drive the rotary rod is rotatory, just the rotary rod can drive the swinging boom upset.

For the reinforcing stability, preferably, base bottom be equipped with the stand, just stand bottom is equipped with the bottom plate, be equipped with the fastening hole on the bottom plate.

Compared with the prior art, the invention has the technical effects that:

the invention has simple structure, convenient use, low energy consumption and low manufacturing cost, and can quickly separate the powder in the tea leaves, improve the quality of the tea leaves and ensure the quality of the tea leaves.

The device is also suitable for screening particles, powder and powder in other products.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the invention.

Figure 2 is a schematic view of the screen assembly of figure 1 with the screen assembly removed.

Fig. 3 is a structural diagram of the right side view of fig. 2.

Fig. 4 is a sectional view taken along the line of fig. 3A-a.

Fig. 5 is a schematic view of the transmission structure in the left side view of fig. 2.

1-a screening frame 2-a base 3-a bottom plate 4-fastening holes 5-a screen 6-a rotating arm 7-a rotating rod 8-a supporting frame 9-a fixed frame 10-a rotating wheel 11-a powder leakage hopper 12-a transmission frame 13-a motor 14-a swinging plate 15-a first swinging shaft 16-a fixed swinging column 17-a control part 18-a second swinging shaft 19-a motor shaft 20-a driving wheel 21-a displacement end plate 22-a displacement column 23-a displacement tooth 24-a fastening part 25-a bearing 17.1-a limiting spring 17.2-a control plate 17.3-a control groove.

Detailed Description

The technical solution of the present invention is further defined in the following description with reference to the accompanying drawings and the specific embodiments, but the scope of the claimed invention is not limited to the description.

The invention is not realized by the conventional technical means or similar operation means disclosed in the prior art according to the common general knowledge of the technical personnel in the field; technical terms which are not specifically described in the invention can be understood by referring to common general knowledge of those skilled in the art, and the technical terms which are clearly described in the invention and can be clearly determined in the drawings can be understood and realized by those skilled in the art through the description of the invention and the structures of the drawings. The directional terminology described in the summary of the invention is as follows, in a manner to face the drawings, and is described with reference to the drawings.

As shown in fig. 1 to 5, in this embodiment, the tea powder sifting device includes a base 2 and a sifting frame 1, the sifting frame 1 is parallel to the base 2, and the sifting frame 1 is located right above the base 2; a transmission assembly is arranged between the screening frame 1 and the base 2, and a swinging assembly is arranged between the screening frame 1 and the side edge of the base 2; the sieving frame 1 can swing back and forth relative to the base 2 along one direction (for example, as shown in fig. 1 or fig. 2, along the front-back direction when the sieve frame is frontally opposite to the drawing) under the combined action of the transmission component and the swinging component; a screen assembly is arranged on the screening frame 1 and comprises a screen 5 and a powder leakage hopper 11, and the powder leakage hopper 11 is positioned under the screen 5; the screen 5 can be turned over along one side edge of the screen frame 1.

In the operation process, the following steps are carried out: the transmission component pushes the sieving frame 1 to enable the sieving frame 1 to swing, and under the action of the swinging component, the sieving frame 1 realizes simple harmonic motion which swings back and forth along the front-back direction shown in figure 1 or figure 2, wherein the front-back direction refers to: when facing to fig. 1 or fig. 2, the powder hopper 11 side is taken as the front end, and the opposite end is taken as the moving direction of the rear end. The screen 5 is arranged on the screen frame 1, so that the screen frame 1 swings when swinging, tea leaves are poured onto the screen 5, the reciprocating swinging process of the screen frame 1 is realized, powder and crushed powder in the tea leaves are removed through screening, the powder and the crushed powder fall into the powder hopper 11 and are discharged, meanwhile, the screen 5 can be turned over, the tea leaves obtained through screening by the screen 5 are turned over through the screen 5 and poured out of the screen 5, then the tea leaves which are not screened completely are poured into the screen 5, and the screening of the tea leaves is continuously completed; the device simple structure, convenient operation sieves efficiently.

The invention particularly utilizes the swing component, thereby realizing boosting swing of the sieving frame 1, stabilizing the sieving frame 1 and enhancing stability; but also can make the sieve frame 1 do the simple harmonic motion of back and forth swing, satisfy the demand of screening out garrulous powder, improve the quality and the quality of tealeaves.

As shown in fig. 3 and 4, in this embodiment, the swing assembly includes a fixed swing post 16 disposed on the base 2 (for example, the fixed swing post 16 may be welded, integrally formed, or otherwise disposed on the upper surface of the base 2, specifically, as shown in fig. 1 and 2), a first swing shaft 15 disposed on a side edge of the sifting frame 1 (for example, the first swing shaft 15 may be welded, integrally formed, or otherwise disposed on a side edge of the sifting frame 1, specifically, as shown in fig. 1 and 2), and a swing plate 14 disposed between the fixed swing post 16 and the first swing shaft 15; a second swing shaft 18 is arranged at one side of the fixed swing post 16 at the bottom of the swing plate 14 (for example, as shown in fig. 3 and 4, the second swing shaft 18 may be integrally formed, or may be arranged in other manners capable of being fixedly connected with the swing plate 14), the fixed swing post 16 is provided with a through hole, a bearing 25 is arranged in the through hole, and the second swing shaft 18 passes through the bearing 25; a control component 17 is arranged at the end of the second swing shaft 18 (for example, as shown in fig. 3 and 4, the control plate 17.2 and the second swing shaft 18 are integrally formed, or other methods such as welding can be adopted to integrally connect the control plate 17.2 and the second swing shaft 18; meanwhile, the control plate 17.2 adopted here is a mechanical structure, which is similar to what can be described as a control block, namely, an action for controlling the swing angle of the second swing shaft 18), and the control component 17 can enable the swing plate 14 to swing back and forth; the top of the swing plate 14 is provided with a through hole at the position of the sieving frame 1, a bearing 25 is arranged in the through hole, and the first swing shaft 15 penetrates through the bearing 25.

The swing assembly of this embodiment uses, can help reducing the energy consumption, utilizes mechanical structure collision effect, realizes control panel 17.2 and fixed swing post 16 internal interaction collision for swing board 14 is swung back and forth under the effect of second balance staff 18, forms the boosting power, helps reducing the energy consumption to a certain extent, improves the required power of the swing back and forth of sieve frame 1.

In a more preferred embodiment, as shown in fig. 3 and 4, the control member 17 includes a control slot 17.3 disposed on the fixed swing post 16, a control plate 17.2 disposed at an end of the second swing shaft 18, the control plate 17.2 is disposed in the control slot 17.3, the control plate 17.2 can swing along with the rotation of the second swing shaft 18, and a clearance slot is formed between a top of the control plate 17.2 and a top of the control slot 17.3; a limiting spring 17.1 is arranged in the clearance groove, the top of the limiting spring 17.1 is connected to the top of the control groove 17.3, and the bottom of the limiting spring 17.1 is connected to the top of the control plate 17.2. Make full use of limiting spring 17.1's effect, solve the simple mechanical structure collision in above-mentioned embodiment, lead to kinetic energy to be difficult to obtain the increase, but the defect that reduces gradually, realize utilizing limiting spring 17.1 compression, the elastic force of recovery process, constantly to control panel 17.2 effect, realize control panel 17.2 swing back and forth, and then make the kinetic energy of second pendulum shaft 18 swing in bearing 25 obtain increasing, and then reduce the required energy consumption of drive assembly when lasting to the effect of sieve frame 1, reduction screening cost that can great degree. And through practical operation research, the equipment energy consumption condition is counted, and when the limiting spring 17.1 is not arranged, the equipment runs for the same time, and the consumed electric energy is at least 20% higher than that of the limiting spring 17.1.

In this embodiment, as shown in fig. 3, two limiting springs 17.1 are provided. For example, as shown in fig. 3, when the control plate 17.2 swings left to extrude and compress the left limit spring 17.1, the right limit spring 17.1 is stretched at the moment, and when the control plate is extruded and compressed the right limit spring 17.1 to the right, the right limit spring 17.1 generates contracted pulling force, and meanwhile, the left limit spring 17.1 generates extended pushing force, so that the swing of the control plate 17.2 is realized, the energy consumption of the transmission assembly on the long-term and long-time load action of the screen moving frame 1 can be greatly improved, the cost is reduced, and the screening efficiency is guaranteed.

As shown in fig. 2 and 5, in this embodiment, the transmission assembly includes a motor 13 mounted on the base 2, a motor shaft 19 connected to the motor 13, a transmission wheel 20 fixedly mounted on the motor shaft 19, and the transmission wheel 20 is provided with a raised displacement tooth 23; the screen frame is characterized by further comprising a transmission frame 12 installed at the bottom of the screen frame 1, wherein a displacement column 22 is integrally formed at the bottom of the transmission frame 12, and a displacement end plate 21 is integrally formed on the displacement column 22; the displacement end plate 21 can be in matched contact with the displacement teeth 23, so that when the displacement teeth 23 rotate to the position of the displacement end plate 21, the displacement end plate 21 is pushed to move. This embodiment can simplify the device installation connection structure, and can make motor 13 can the intermittent type nature act on displacement end plate 21, avoid continuous load operation, help reducing the energy consumption.

The invention particularly relates to a tea powder screening device formed by combining a control part 17 and a transmission assembly structure of the embodiment, which can reduce energy consumption to a greater extent, so that a motor 13 can be in idle load operation in the process of back-and-forth swinging of a screening frame 1, a displacement end plate 21 is acted by clearance, and the energy consumption in the screening process is reduced; especially, utilize the structural design of control unit 17, utilize the structure of spacing spring 17.1 and the structure phase-match design that contacts between displacement tooth 23 and the displacement end plate 21, can make the effect energy consumption of displacement tooth 23 and displacement end plate 21 reduce, reduce and sieve the energy consumption cost, and the guarantee sieves the effect of removing to garrulous powder, powder in the tealeaves.

In this embodiment, as shown in fig. 5, the transmission wheel 20 is fixedly connected with the motor shaft 19 by a fastening member 24. The fastening piece can be a polygonal jack and a bolt which is matched and inserted into the jack, the axial center of a motor shaft is provided with the polygonal jack, the end part of the bolt is integrally formed with a plurality of fastening strips which are vertical to the axial direction of the bolt, and the end surface of the transmission wheel is provided with a clamping groove which is matched and clamped with the fastening strips; the transmission wheel, the motor shaft and the bolt are vertically provided with pin holes in a radial direction in a matched manner, and pin columns are arranged in the pin holes and can connect the transmission wheel, the motor shaft and the bolt into a whole. The motor shaft 19 and the transmission wheel 20 can be disassembled, so that the maintenance and the replacement are convenient; and simultaneously, the stability of connection can be improved.

As shown in fig. 1 and 2, a support frame 8 is arranged on an edge of one side of the screen frame 1, a fixed frame 9 is arranged on the support frame 8, and a bearing 25 is arranged on the fixed frame 9; the bearing 25 is provided with a rotating rod 7 in a penetrating manner, a rotating arm 6 is integrally formed on the rotating rod 7, the rotating arm 6 is fixedly connected with the screen 5, and a rotating wheel 10 is arranged at the end part of the rotating rod 7; the swiveling wheel 10 can drive the rotating rod 7 to rotate, and the rotating rod 7 can drive the rotating arm 6 to overturn. When 6 upsets through the swinging boom, drive screen cloth 5 and take place the upset, realize pouring out the tealeaves on the screen cloth 5 screen surface from being equipped with 8 one sides of support frame, so as long as put the dustpan or other containers that hold in one side that is equipped with 8 support frames on the device for tealeaves on the screen cloth 5 can be poured into and collect can. After pouring out, utilize the effect of swiveling wheel 10 for swinging boom 6 is reverse to be overturned, and then keeps flat screen cloth 5 back sieve frame 1 on, realizes that the secondary pours into the tealeaves that does not sieve and sieves, and operation mode is simple, convenient to use.

As shown in fig. 1 and fig. 2, in this embodiment, a pillar is disposed at the bottom of the base 2, a bottom plate 3 is disposed at the bottom of the pillar, and a fastening hole 4 is disposed on the bottom plate 3. Can utilize the effect of 4 fastening holes, fix device whole on the subaerial in factory building workshop, reinforcing stability.

The motor 13 adopted in the invention can be a motor with a rated power of 220V or 380V, or other power devices which can rotate the motor shaft 19 and drive the transmission wheel 20 to rotate can be adopted, for example: the motor 13 is replaced by a gasoline engine, a support column of a motor shaft 19 is arranged on the base 2, a bearing is arranged on the support column, the motor shaft 19 penetrates through the bearing, a driving wheel 20 is arranged at one end of the motor shaft 19, a belt pulley is arranged at the other end of the motor shaft 19, and the gasoline engine and the belt pulley are connected through a belt.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (9)

1. The tea powder screening device is characterized by comprising a base (2) and a screening frame (1), wherein the screening frame (1) is parallel to the base (2), and the screening frame (1) is positioned right above the base (2); a transmission assembly is arranged between the screening frame (1) and the base (2), and a swinging assembly is arranged between the screening frame (1) and the side edge of the base (2); the screening frame (1) can swing back and forth along one direction relative to the base (2) under the combined action of the transmission assembly and the swinging assembly; a screen assembly is arranged on the screening frame (1), the screen assembly comprises a screen (5) and a powder leakage hopper (11), and the powder leakage hopper (11) is positioned under the screen (5); the screen (5) can be turned over along the edge of one side of the screen frame (1).

2. The tea powder screening device according to claim 1, wherein the swing assembly comprises a fixed swing post (16) provided on the base (2), a first swing shaft (15) provided on a side edge of the screening frame (1), and a swing plate (14) provided between the fixed swing post (16) and the first swing shaft (15); a second swing shaft (18) is arranged at one side, located on the fixed swing column (16), of the bottom of the swing plate (14), a through hole is formed in the fixed swing column (16), a bearing (25) is arranged in the through hole, and the second swing shaft (18) penetrates through the bearing (25); a control component (17) is arranged at the end part of the second swing shaft (18), and the control component (17) can enable the swing plate (14) to swing back and forth; the top of the swing plate (14) is located at the position of the screening frame (1) and is provided with a through hole, a bearing (25) is arranged in the through hole, and the first swing shaft (15) penetrates through the bearing (25).

3. The tea powder screening device according to claim 2, wherein the control member (17) comprises a control groove (17.3) provided on the fixed swing post (16), a control plate (17.2) provided at an end of the second swing shaft (18), the control plate (17.2) is located in the control groove (17.3), the control plate (17.2) can swing along with the rotation of the second swing shaft (18), and a clearance groove is formed between a top of the control plate (17.2) and a top of the control groove (17.3); a limiting spring (17.1) is arranged in the clearance groove, the top of the limiting spring (17.1) is connected to the top of the control groove (17.3), and the bottom of the limiting spring (17.1) is connected to the top of the control plate (17.2).

4. The tea powder sifting device of claim 3 wherein there are two limit springs (17.1).

5. The tea dust sifting apparatus of claim 3 wherein the control plate (17.2) is integrally formed with the second pivot shaft (18).

6. The tea powder screening device according to claim 1, wherein the transmission assembly comprises a motor (13) mounted on the base (2), a motor shaft (19) connected to the motor (13), a transmission wheel (20) fixedly mounted on the motor shaft (19), the transmission wheel (20) being provided with raised displacement teeth (23); the screen frame is characterized by further comprising a transmission frame (12) arranged at the bottom of the screen frame (1), wherein a displacement column (22) is integrally formed at the bottom of the transmission frame (12), and a displacement end plate (21) is integrally formed on the displacement column (22); the displacement end plate (21) can be in matched contact with the displacement teeth (23), so that when the displacement teeth (23) rotate to the position of the displacement end plate (21), the displacement end plate (21) is pushed to move.

7. The tea powder screening device according to claim 6, wherein the driving wheel (20) is fixedly connected with the motor shaft (19) by a fastening member (24).

8. The tea powder screening device according to claim 1, wherein a support frame (8) is provided on one side edge of the screen frame (1), a fixed frame (9) is provided on the support frame (8), and a bearing (25) is provided on the fixed frame (9); the bearing (25) is provided with a rotating rod (7) in a penetrating manner, a rotating arm (6) is integrally formed on the rotating rod (7), the rotating arm (6) is fixedly connected with the screen (5), and a rotating wheel (10) is arranged at the end part of the rotating rod (7); the rotating wheel (10) can drive the rotating rod (7) to rotate, and the rotating rod (7) can drive the rotating arm (6) to overturn.

9. The tea powder screening device according to claim 1, 2 or 6, wherein the bottom of the base (2) is provided with a column, the bottom of the column is provided with a bottom plate (3), and the bottom plate (3) is provided with a fastening hole (4).

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