Tea classifying and screening equipment

Abstract

The invention relates to the technical field of tea leaf screening, in particular to tea leaf grading and screening equipment which comprises a rotary tea leaf random selection platform capable of rotating and taking and placing tea leaves. A plurality of tea leaf carrying pipes which are distributed at intervals in the circumferential direction, can expose the rotary tea leaf random selection platform and are used for adsorbing and putting down tea leaves are arranged on the rotary tea leaf random selection platform; the periphery of the rotary tea leaf random selection platform is provided with a tea leaf storage box which is close to the rotary tea leaf random selection platform, can allow the tea leaf carrying pipe to enter and is used for storing tea leaves; a tea discrete distribution, bearing and transferring table plate for putting down and transferring tea is arranged below the rotary tea random selection platform, the screening mechanism is used for screening the tea on the tea discrete distribution, bearing and transferring table plate, and the degree of refinement is higher.

Description

Technical Field

[0001] The invention relates to the technical field of tea screening, in particular to a tea grading and screening device. Background Art

[0002] Tea goes through many processes during the production process, among which screening is a very important step. Tea leaves of different sizes and qualities need to be better distinguished in order to produce tea with good consistency and high quality, and to eliminate poor tea leaves, so as to better meet the needs of refined tea production.

[0003] There are already many tea screening technologies in the prior art, such as a multi-level tea screening device for tea processing disclosed in Chinese patent application number 202220385751.X. In view of the inconvenience of using multiple sieve plates for multi-level screening and the time-consuming and labor-intensive manual shaking screening, the following solution is proposed, which includes a base, a first support plate is fixed on both sides of the top of the base, a second support plate is fixed at one end of the top of the base, a servo motor is fixed at the other end of the top of the base, and a rotating shaft is fixed at the power output end of the servo motor.

[0004] For another example, a Chinese patent application numbered 201810951295.9 discloses a multi-stage screening tea screening box, comprising a box body, a driving motor fixedly connected to the right side of the box body, an output end of the driving motor extending to the interior of the box body and fixedly connected to a reduction device, a driving shaft fixedly connected to the left side of the reduction device, a left end of the driving shaft rotatably connected to the left wall inside the box body, a linkage shaft rotatably connected to the left wall inside the box body, the linkage shaft is connected to the driving shaft through a conveyor belt, a first bevel gear is fixedly connected to the right end of the linkage shaft, and a micro-motion rod is rotatably connected to the bottom wall inside the box body.

[0005] Although the existing screening equipment can already achieve good screening effects and is relatively automated, and the accumulation of tea leaves has been significantly reduced, the degree of segmentation of tea leaf size and quality still needs to be optimized. There are still deficiencies in the more refined production of high-quality tea leaves and grade control. Summary of the invention

[0006] The purpose of the present invention is to provide a tea grading and screening device with a higher degree of refinement.

[0007] The above object of the present invention is achieved by the following technical solutions: A tea grading and screening device includes a rotary tea random selection platform that can rotate and pick up and place tea. A plurality of tea handling pipes are arranged on the rotary tea random selection platform at circumferential intervals, which can expose the rotary tea random selection platform and are used for adsorbing and putting down tea. A tea feeding box for holding tea is arranged outside the rotary tea random selection platform and is close to the rotary tea random selection platform and can allow the tea handling pipes to enter. A tea discrete distribution bearing and turnover table board for putting down and turning over tea is arranged below the rotary tea random selection platform. The device also includes a screening mechanism for screening the tea on the tea discrete distribution bearing and turnover table board.

[0008] As a preference of the present invention, the axis of the rotary tea random selection platform is in the horizontal direction, the tea handling pipes can be telescopic in the radial direction of the rotary tea random selection platform, the tea handling pipes adsorb tea by means of vacuum pumping, and the radially outer port of the tea handling pipe serves as a tea adsorption port and can enter the tea feeding box.

[0009] As a preference of the present invention, all the tea handling pipes are arranged in a circumferential array on the rotary tea random selection platform, and the tea handling pipes are of a straight pipe structure.

[0010] As a preference of the present invention, the rotary tea random selection platform includes a main fixed shaft for support and a driving wheel body that is sleeved on the main fixed shaft and can rotate around the main fixed shaft. The tea handling pipes are arranged along the radial direction of the driving wheel body and are telescopic in the radial direction, and a radial telescopic displacement forming component for enabling the tea handling pipes to be telescopic is arranged inside the driving wheel body.

[0011] As a preference of the present invention, the radial telescopic displacement forming component includes a guiding rod fixedly connected to the outer wall of the tea handling pipe and a central special-shaped guiding block that cooperates with the guiding rod and is fixedly arranged on the main fixed shaft. The outer surface of the central special-shaped guiding block forms a support guiding surface for the guiding rod to support and move in the radial direction, and at least a part of the continuous section of the support guiding surface has a different length dimension from the axis.

[0012] As a preference of the present invention, the central special-shaped guiding block is a cam, the support guiding surface is formed on the outer peripheral surface of the central special-shaped guiding block, and at least one section with a changing radius is arranged close to the tea feeding box. The guiding rod includes a radial section extending radially and an axial section fixedly connected perpendicular to the radial section. The axial section is fixedly connected to the outer wall of the tea handling pipe, and the end of the radial section close to the axis forms an arc-shaped end for abutting against and relatively moving with the support guiding surface.

[0013] Preferably, a vacuum driving chamber is formed in the driving wheel body, which is circumferentially and independently separated and into which each tea conveying pipe is inserted for taking and placing tea in a vacuum manner. A hollow cavity is formed in the main fixed shaft, and the part where the hollow cavity is located is connected to a vacuum generator through a vacuum pipe. An arc-shaped vacuum contact hole is formed on the part where the hollow cavity is located, which extends circumferentially and can communicate with the vacuum driving chamber. A vacuum driving hole communicating with the arc-shaped vacuum contact hole is formed at a position on the driving wheel body on the side radially close to the axis of the vacuum driving chamber. A telescopic guiding hole communicating with the arc-shaped vacuum contact hole and for the tea conveying pipe to pass through and be telescopically guided is formed at a position on the driving wheel body on the side radially away from the axis of the vacuum driving chamber.

[0014] Preferably, the invention further includes a frame, on which an installation column and an installation cross beam fixed on the installation column are fixed. A suspension bracket for suspending and hoisting the rotary tea random selection platform and the tea discharging box is fixed on the installation cross beam.

[0015] Preferably, a rotating driving internal gear ring for the driving wheel body to rotate is fixed on the driving wheel body. An internal driving gear meshing with the rotating driving internal gear ring and a first motor are installed on the suspension bracket, and the internal driving gear is installed and connected to the first motor.

[0016] Preferably, the tea discrete distribution and loading turnover table board is installed and connected to a second motor located below it for horizontal rotation. The screening mechanism includes a camera mechanism for photographing the tea on the tea discrete distribution and loading turnover table board, a plurality of tea grading and screening collection pools located around the tea discrete distribution and loading turnover table board, and a plurality of air blowing pipes for blowing and collecting the tea on the tea discrete distribution and loading turnover table board into the corresponding tea grading and screening collection pools. The air blowing pipes are connected to an air blowing mechanism. The screening mechanism further includes a microprocessor for controlling the operation of the camera mechanism and the air blowing mechanism. The microprocessor drives the corresponding air blowing pipes to blow the corresponding tea into the corresponding tea grading and screening collection pools according to the photographing situation of the tea by the camera mechanism.

[0017] Advantages of the invention: The screening device of the present application has a higher degree of subdivision of tea, is more conducive to the production of high-quality tea, can also divide the size and quality of tea more finely, and makes the control of tea quality more accurate. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the tea grading and screening device in Embodiment 1;

[0019] Figure 2 is Figure 1 Schematic diagram of the three-dimensional structure from the front side view;

[0020] Figure 3 is Figure 1 Schematic diagram of the three-dimensional structure of the tea picking and placing part;

[0021] Figure 4 is Figure 3 Schematic diagram of the three-dimensional structure from the front side view;

[0022] Figure 5 is Figure 3 Schematic diagram of the three-dimensional structure from the left side view;

[0023] Figure 6 is Figure 3 Schematic diagram of the three-dimensional structure of the tea feeding box in;

[0024] Figure 7 is Figure 3 Schematic diagram of the three-dimensional structure of the rotary tea random selection platform in;

[0025] Figure 8 is Figure 7 Schematic diagram of the three-dimensional structure from the front side view;

[0026] Figure 9 is Figure 7 Schematic diagram of the three-dimensional structure after the front half of the driving wheel body is cut and removed;

[0027] Figure 10 is Figure 7 Schematic diagram of the three-dimensional structure of the rear half of the driving wheel body in;

[0028] Figure 11 is Figure 10 Schematic diagram of the three-dimensional structure from the rear side view;

[0029] Figure 12 is Figure 7 Schematic diagram of the three-dimensional structure of the front half of the driving wheel body in;

[0030] Figure 13 is Figure 7 Schematic diagram of the three-dimensional structure after the driving wheel body is removed from the structure in;

[0031] Figure 14 is Figure 13 Schematic diagram of the three-dimensional structure from the rear side view;

[0032] Figure 15 is Figure 14 Schematic diagram of the three-dimensional structure after the guide rod and the middle shaft sleeve are removed from the structure in;

[0033] Figure 16 isFigure 15 Schematic three-dimensional structure diagram after the middle structure is removed and the bearing is removed;

[0034] Figure 17 is Figure 16 Schematic three-dimensional structure diagram of the main fixed shaft remaining after the middle structure removes the central special-shaped guide block;

[0035] Figure 18 is Figure 7 Schematic three-dimensional structure diagram of the interior after the front side of the driving wheel body in [[ ]] is cut open. Specific implementation manner

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] This specific embodiment is only an interpretation of the present invention and does not limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

[0038] Example 1, as Figure 1-18As shown in the figure, a tea grading and screening device includes a rotary tea random selection platform that can rotate and pick up and place tea. The rotary tea random selection platform can randomly select and pick up individual tea leaves from the messy tea, and can continuously perform the actions of tea selection and picking through rotation, and place the tea at a designated position. The specific implementation is as follows: There are multiple tea handling tubes 1 arranged at intervals in the circumferential direction on the rotary tea random selection platform, which can expose the rotary tea random selection platform and are used for adsorbing and placing tea. The tea handling tube 1 preferably uses a vacuum method to randomly suck a tea leaf from the tea pile and can be placed by rotating to a designated position. Since the rotary tea random selection platform in this application is designed with a Ferris wheel-like concept structure, similar to a rotating roulette structure, there can be many tea handling tubes 1 on it, so that the operation of picking up and placing tea leaves can be continuously carried out. Of course, the tea pile needs to be placed in a special container, and it can be designed like this. There is a tea feeding box 2 for placing tea, which is close to the rotary tea random selection platform and can allow the tea handling tube 1 to enter. Different-sized, -colored, and -shaped teas are placed in the tea feeding box 2 to form an internal tea pile. The tea handling tube 1 rotates with the rotary tea random selection platform and enters the tea feeding box 2, and randomly adsorbs a tea leaf through the vacuum method. Then the tea handling tube 1 rotates away from the tea feeding box 2 with the rotary tea random selection platform. When the tea handling tube 1 is rotated to the corresponding position, the vacuum effect is lost, and the tea leaf will fall off the tea handling tube 1. Correspondingly, there is a tea discrete distribution carrying and turnover table board 3 below the rotary tea random selection platform for placing and turning over the tea. The tea leaves dropped by the tea handling tube 1 fall on the tea discrete distribution carrying and turnover table board 3. In this embodiment, the tea discrete distribution carrying and turnover table board 3 can move, which can be a linear movement, but we preferably choose the tea discrete distribution carrying and turnover table board 3 to be circular or annular and rotating. Since there are multiple tea handling tubes 1 and they are spaced on the rotary tea random selection platform, there is a time difference for each tea handling tube 1 to drop tea. Therefore, when the tea discrete distribution carrying and turnover table board 3 is rotating, the tea leaves will be separately received on the tea discrete distribution carrying and turnover table board 3, that is, they will be discretely distributed. Thus, the teas in the tea feeding box 2 can be separated and scattered one by one on the tea discrete distribution carrying and turnover table board 3, which can prevent tea from piling up and is also more conducive to observation and distinction. By picking up and dispersing and dropping the individual tea leaves, better screening can be carried out, and more refined grading and screening can be performed on each tea leaf.In the above situation, the screening device further includes a screening mechanism for screening the tea leaves on the tea leaf discrete distribution and carrying turntable 3. The screening mechanism can adopt existing ones for screening discrete objects, such as some sorting devices for small fruits. Usually, image recognition technology or a vision system is required for analysis, and then according to the analysis results, simple pneumatic or electric devices and other mechanical structures are driven to move the objects to be screened into the corresponding graded collection containers. This application is also suitable for such sorting devices. By observing the size, color, shape, defects, etc. of the tea leaves, the tea leaves can be screened into tea leaf collection containers of various grade standards, which will be specifically elaborated in the following embodiments.

[0039] The following introduces the specific implementation means. The axial direction of the rotary tea leaf random selection platform is in the horizontal direction. For example, it can be in the front-back direction. Then the rotary tea leaf random selection platform is a Ferris wheel-like structure that rotates in a vertical plane and rotates cyclically between left and right. And the tea leaf handling pipe 1 can be telescopic in the radial direction of the rotary tea leaf random selection platform. The telescopic structure design is to facilitate the tea leaf handling pipe 1 to enter the tea leaf feeding box 2 without causing obstacles. The tea leaf handling pipe 1 can retract radially by a certain distance and then rotate into the inner area of the tea leaf feeding box 2 along with the rotary tea leaf random selection platform and then extend radially by a certain distance. The tea leaf handling pipe 1 forms an internal and external air pressure difference in the tea leaf feeding box 2 through the shaft vacuum method, and the tea leaves will be adsorbed by the tea leaf handling pipe 1. That is, the tea leaf handling pipe 1 adsorbs the tea leaves by means of vacuum pumping. And the radially outer port of the tea leaf handling pipe 1 serves as the tea leaf adsorption port and can enter the tea leaf feeding box 2. It should be noted that the tea leaf feeding box 2 needs to be as close as possible to the rotary tea leaf random selection platform without affecting the rotation of the rotary tea leaf random selection platform. In this way, it can not only ensure that the tea leaves will not leak but also not affect the normal operation. The extended part of the tea leaf handling pipe 1 can also stir the tea leaf pile in the tea leaf feeding box 2. The tea leaf feeding box 2 can be on the left or right side of the rotary tea leaf random selection platform. In this embodiment, it can be set on the left side. In the above implementation method, the rotary tea leaf random selection platform is upright. Of course, the rotary tea leaf random selection platform can be horizontal or inclined. The main thing is that it can rotate and can drive the tea leaf handling pipe 1 to enter the tea leaf feeding box 2 to randomly select and suck the tea leaves, and then put down the tea leaves outside the tea leaf feeding box 2, which can also realize the individual picking up and putting down of the tea leaves onto the tea leaf discrete distribution and carrying turntable 3 for discrete distribution, and then be screened by the screening mechanism. However, the method recommended in this embodiment has better effects and is not prone to failures.

[0040] Further, all the tea leaf handling tubes 1 are distributed in a circumferential array on the rotary tea leaf random selection platform. The tea leaf handling tubes 1 are of a linear tube structure. This implementation is relatively simple and effective, and the structure is also relatively stable. The diameter of the tea leaf handling tube 1 should not be too large, generally about 5 mm in tube diameter. Of course, it also needs to be determined according to the size of the overall tea leaves, and preferably according to the smaller tea leaves. It is necessary to ensure that the small tea leaves will not be sucked into the tea leaf handling tube 1. Of course, the equipment of the present application is more suitable for screening freshly harvested tea leaves, so the tea leaves are relatively plump and more suitable for this vacuum adsorption and handling method. Of course, the tea leaves during the later production process can also be screened in this way. At this time, the diameter of the tea leaf handling tube 1 and the control of the vacuum degree need to be selected through multiple tests to select appropriate parameters to ensure that the tea leaves can be picked and placed by vacuum better.

[0041] Preferably, the rotary tea leaf random selection platform includes a main fixed shaft 51 for support and a driving wheel body 52 sleeved on the main fixed shaft 51 and capable of rotating around the main fixed shaft 51. The tea leaf handling tube 1 is radially penetrated through the driving wheel body 52 and can be telescopic in the radial direction. A radial telescopic displacement forming component capable of making the tea leaf handling tube 1 telescopic is arranged in the driving wheel body 52. The main fixed shaft 51 preferably extends horizontally in the front and rear directions. The driving wheel body 52 can rotate in the vertical plane, and can make the radially outer end of the tea leaf handling tube 1 enter the tea leaf feeding box 2 to suck tea leaves. Then, the tea leaf handling tube 1 sucking the tea leaves is rotated to a lower position, and the tea leaves can fall when the vacuum effect is lost. All the tea leaf handling tubes 1 on the driving wheel body 52 perform the tea leaf picking and placing operations in a cycle according to this circumferential array arrangement.

[0042] Furthermore, the radial telescopic displacement forming assembly includes a guide rod 53 fixedly connected to the outer wall of the tea handling pipe 1, and a central special-shaped guide block 54 that cooperates with the guide rod 53 and is fixedly arranged on the main fixed shaft 51. The outer surface of the central special-shaped guide block 54 forms a support guide surface 541 for the guide rod 53 to be supported and move radially. At least a part of the continuous section of the support guide surface 541 has different length dimensions from the axis. The guide rod 53 is used to drive the tea handling pipe 1 to move back and forth radially on the driving wheel body 52 to achieve telescoping. However, there is no direct power structure inside this kind of telescoping, so the central special-shaped guide block 54 is designed. A circle of support guide surface 541 is formed on the outer peripheral surface of the central special-shaped guide block 54. Since the driving wheel body 52 rotates and drives the guide rod 53 and the tea handling pipe 1 to rotate, when the central special-shaped guide block 54 and the main fixed shaft 51 are both set in a fixed state, due to the rotation of the guide rod 53, the end portion on its radially inner side will support and guide different circumferential positions of the support guide surface 541. Since a part of the support guide surface 541 has different length dimensions from the axis, that is, it can be understood that there are continuous parts with different radii, that is, the central special-shaped guide block 54 is not a regular circular block, but a guide block with an irregular outer periphery as a curved surface. This makes the radial position supported by the radially inner end of the guide rod 53 change with rotation, so as to form a radial displacement and achieve the telescoping function.

[0043] Specifically, the central special-shaped guiding block 54 is a cam. The supporting guiding surface 541 is formed on the outer peripheral surface of the central special-shaped guiding block 54, and there is at least one section with a changing radius near the tea feeding box 2. It is very suitable to use a cam as the central special-shaped guiding block 54 here, and the outer peripheral surface thereof is exactly an irregular circle, that is, the radius dimension of the supporting guiding surface 541 will have inconsistent sections. In this way, the radial supporting positions of the guiding rod 53 can be different, so that telescopic movement in the radial direction can be achieved. Especially near the tea feeding box 2, it is necessary to make the guiding rod 53 retract the tea carrying pipe 1 on the driving wheel body 52, so that the tea carrying pipe 1 can smoothly enter the tea feeding box 2, and then gradually extend out, so that the tea carrying pipe 1 extends out of the driving wheel body 52 by a certain distance and adsorbs a piece of tea. When moving out of the tea feeding box 2, it is determined whether to retract according to the structure of the tea feeding box 2. Usually, there is no obstruction at the position where the tea feeding box 2 is moved out, so there is no need to retract. If there is also an obstruction, it is necessary to retract. Of course, if there is no obstruction when rotating into the tea feeding box 2 and there is an obstruction when moving out, at this time, there is no need to retract first. The tea carrying pipe 1 can enter in the state of extending out of the driving wheel body 52, adsorb the tea leaves and then move out, and retract when moving out to ensure smooth movement out. That is, at the inlet and outlet positions near the tea feeding box 2, at least one section of the supporting guiding surface 541 corresponding to one of the positions has a radius that changes from small to large or from large to small relative to the axis of the main fixed shaft 51, so as to realize the retraction or extension of the tea carrying pipe 1. In this embodiment, since both the tea feeding box 2 and the driving wheel body 52 are vertically arranged, it is preferably that the tea carrying pipe 1 enters the tea feeding box 2 during the process of the driving wheel body 52 rotating from bottom to top, and it is preferably that the tea carrying pipe 1 retracts at the lower side position of the tea feeding box 2, because there will be an obstruction at the lower side of the tea feeding box 2, because it is necessary to block the lower side of the tea to prevent leakage. In this way, when the tea carrying pipe 1 moves up as the driving wheel body 52 rotates from bottom to top, it needs to retract to avoid the structure at the lower side of the tea feeding box 2, extend out after entering and adsorb the tea leaves. For the upper side of the tea feeding box 2, since there is no need to consider the problem of leakage when putting in the tea, it can remain in the extended state. Then, a section of the supporting guiding surface 541 radially facing the lower side position of the tea feeding box 2 can be designed as a section with a changing radius, and the radius changes from large to small and then from small to large along the rotation direction to realize retraction and extension. Of course, there can also be only one section that changes from small to large, because during the previous rotation process, the tea carrying pipe 1 can retract in advance and maintain a certain path, and then extend out after entering the tea feeding box 2 after passing the blocking position at the lower side of the tea feeding box 2.In this embodiment, the tea feeding box 2 is on the left side. It is recommended that the driving wheel body 52 rotates from the lower left to the upper left direction, and rotates clockwise when observed from the rear side. This has a better effect. Then, there is a section at the lower left of the support guiding surface 541 where the radius needs to increase relative to the lower side position of the tea feeding box 2. In this way, the tea conveying pipe 1 can extend into the tea feeding box 2. Of course, before the tea conveying pipe 1 passes through the lower side part of the tea feeding box 2, it needs to retract in time to avoid or retract in advance to maintain a certain stroke to ensure avoidance and pass upward through the obstruction of the lower side part of the tea feeding box 2. The central special-shaped guiding block 54 can be made of a steel block, while the tea conveying pipe 1 and the guiding rod 53 can be plastic parts and can be fixedly connected by an integral molding method. In addition, the support guiding surface 541 needs to be kept smooth, and the support part of the guiding rod 53 radially inward also needs to be smooth. In this way, the relative movement friction with the support guiding surface 541 is small, and it will not affect the rotation of the driving wheel body 52.

[0044] Furthermore, the guiding rod 53 includes a radially extending radial section 531 and an axial section 532 perpendicularly and fixedly connected to the radial section 531. The radial section 531 and the axial section 532 preferably form an L shape. The rear end of the axial section 532 can be integrally and fixedly connected to the radially outer end of the radial section 531. In this embodiment, the meaning of the inner and outer ends in the radial direction is that the one closer to the axis is the inner, and the one farther from the axis is the outer. In addition, the axial section 532 is fixedly connected to the outer wall of the tea conveying pipe 1. Preferably, the front end of the axial section 532 is integrally and fixedly formed with the outer wall of the tea conveying pipe 1. One end of the radial section 531 close to the axis forms an arc-shaped end 5311 and is used to abut against and relatively move with the support guiding surface 541. That is, the radially inner end of the radial section 531 is an arc end, and according to the above, the arc-shaped end face of the arc-shaped end 5311 should be as smooth as possible to abut against and relatively move with the support guiding surface 541. The central special-shaped guiding block 54 can be fixed on the main fixed shaft 51 by an existing key method or other fixing methods, and the main fixed shaft 51 also needs to be preferably fixed.

[0045] In addition, the overall structure of the guiding rod 53 and the tea conveying pipe 1 is preferably elastically buffered during expansion and contraction. In this way, on the one hand, there is a stable structure with elastic support, and the tea conveying pipe 1 will not be loose radially and can always maintain a tight support state, ensuring that the radial section 531 and the support guiding surface 541 can always be in contact and support without leaving and becoming loose, resulting in the instability of the tea conveying pipe 1. On the other hand, the elastic support has good buffering performance, avoids hard damage, and improves the safety during the expansion and contraction process. The specific elastic structure will be further elaborated later.

[0046] Preferably, a vacuum driving chamber 10 is formed in the driving wheel body 52, which is circumferentially and independently separated and for each tea carrying tube 1 to be placed and the tea is picked up and placed by vacuum. The vacuum driving chamber 10 is preferably fan-shaped. A hollow cavity 510 is formed in the main fixed shaft 51, and the part where the hollow cavity 510 is located is connected to a vacuum generator z2 through a vacuum tube z1. And an arc-shaped vacuum contact hole 5100 extending circumferentially and capable of communicating with the vacuum driving chamber 10 is formed on the part where the hollow cavity 510 is located. The arc-shaped vacuum contact hole 5100 radially penetrates through the part where the main fixed shaft 51 is located. The arc-shaped vacuum contact hole 5100 forms a contact channel. Only in the vacuum driving chamber 10 in this area can the effect of generating vacuum be formed. That is, the vacuum generator z2 can always work without stopping, evacuating the hollow cavity 510, and through the design of the arc-shaped vacuum contact hole 5100, the vacuum driving chamber 10 falling into the area of the arc-shaped vacuum contact hole 5100 will form a vacuum, so that the tea carrying tube 1 in the vacuum driving chamber 10 can become a vacuum and thus adsorb tea leaves. The arc length of the arc-shaped vacuum contact hole 5100 is preferably at least more than one-third of the circumference of the part where the main fixed shaft 51 is located, and it can be ensured as much as possible that the vacuum driving chamber 10 can act during the process from the lower side to the upper side of the tea feeding box 2 and when rotating to the lower right. Further preferably, the arc-shaped vacuum contact hole 5100 extends from the lower left of the main fixed shaft 51 along the clockwise outer circumference to the upper right, so as to ensure that the vacuum driving chamber 10 starts to be evacuated from the lower left, so that when rotating upward through the tea feeding box 2 during the rotation process, it is in a vacuum state. The tea carrying tube 1 can adsorb tea leaves in a vacuum state and rotate clockwise with the tea leaves. When the arc-shaped vacuum contact hole 5100 does not act on the vacuum driving chamber 10 at the upper right position, air will slowly enter the vacuum driving chamber 10 from the structure or the gaps between the hole structures and the vacuum state will be gradually lost. Therefore, the tea leaves will still be sucked and rotated, and it is appropriate to ensure that they can just fall when rotating to the lower side. Because there are some hole designs in the vacuum driving chamber 10, including the driving wheel body 52 itself, if it is a front-back splicing type structure or the mating relationship with the main fixed shaft 51 is not completely closed, air will enter. Of course, the arc length of the arc-shaped vacuum contact hole 5100 can be further extended to the right or the lower right. Because if the gap is large, air will enter quickly, so the vacuum state needs to be maintained for a longer time. If the sealing performance of the vacuum driving chamber 10 is good, the length of the arc-shaped vacuum contact hole 5100 can be made shorter.Furthermore, a vacuum driving hole 100 connected with the arc-shaped vacuum contact hole 5100 is formed in the driving wheel body 52 at a position radially close to the axis of the vacuum driving chamber 10. The lower side of the vacuum driving chamber 10 is not completely opened to connect with the arc-shaped vacuum contact hole 5100, otherwise the size is too large to control, and the driving wheel body 52 is located at the radial inner side of the vacuum driving chamber 10. If there is no solid sleeve structure, it will be very unfavorable for installation support and structural protection. Therefore, there will be a solid sleeve structure, and the vacuum driving hole 100 is opened on this solid structure and radially penetrates. The vacuum driving hole 100 is preferably a circular hole, and the aperture of the vacuum driving hole 100 is generally set to be similar to or slightly larger than the outer diameter of the tea transporting tube 1. The arc length of the arc vacuum contact hole 5100 has been discussed above, and the front-to-back width of the arc vacuum contact hole 5100 is preferably greater than the hole diameter of the vacuum drive hole 100, and when the vacuum drive hole 100 falls into the area where the arc vacuum contact hole 5100 is located in the circumferential direction, the vacuum drive hole 100 is located between the front and back of the arc vacuum contact hole 5100, that is, the radial projection of the vacuum drive hole 100 can completely fall into the radial projection of the arc vacuum contact hole 5100, ensuring that the vacuum drive hole 100 is optimal in the vacuum extraction efficiency, and the vacuum drive hole 100 is also preferably located in the central area of the entity part of the vacuum drive chamber 10 located at the radial inner position. Therefore, the vacuum drive chamber 10 needs to wait for the vacuum drive hole 100 that matches it radially to rotate to the arc vacuum contact hole 5100 area before vacuuming, and the tea transport tube 1 in the vacuum drive chamber 10 begins to become a vacuum, and can absorb tea leaves. The radial and axial directions here are those of the driving wheel body 52 and the main fixed shaft 51, and their radial and axial directions are consistent. Further, a telescopic guide hole 52110 is formed in the driving wheel body 52 on the side of the vacuum driving chamber 10 radially away from the axis, which is connected to the arc-shaped vacuum contact action hole 5100 and for the tea transporting tube 1 to pass through for telescopic guidance. The setting of the telescopic guide hole 52110 facilitates the telescopic guidance of the tea transporting tube 1, and also limits the circumferential and axial position of the tea transporting tube 1 and the guide rod 53 so that the tea transporting tube 1 can rotate with the driving wheel body 52. The aperture of the telescopic guide hole 52110 is slightly larger than the outer diameter of the tea transporting tube 1, and the size difference should be as small as possible. A small gap can be left between the two to ensure the accuracy of the guidance and the compactness of the assembly structure, and at the same time, the radial telescopic extension of the tea transporting tube 1 is smooth.

[0047] Specifically, the driving wheel body 52 includes an annular front panel 521 and an annular rear panel 522. An outer shaft sleeve 5211 is connected between the outer ring part of the front panel 521 and the outer ring part of the rear panel 522. An inner shaft sleeve 5212 is connected between the inner ring part of the front panel 521 and the inner ring part of the rear panel 522. A plurality of inner partition plates 5213 extending radially and arranged at intervals in the circumferential direction are integrally connected between the outer shaft sleeve 5211 and the inner shaft sleeve 5212. These inner partition plates 5213 are distributed in a circumferential circular array. The front side of the inner partition plate 5213 can be integrally connected to the rear side of the front panel 521, and the rear side of the inner partition plate 5213 can be integrally connected to the front side of the rear panel 522. In this way, the front panel 521, the rear panel 522, the outer shaft sleeve 5211, and the inner shaft sleeve 5212 enclose the inner space of the driving wheel body 52, and the plurality of inner partition plates 5213 arranged at intervals in the circumferential direction divide the inner space of the wheel body into a plurality of vacuum driving chambers 10. The vacuum driving chambers 10 are spaces with relatively good airtightness. However, due to the design of structures such as holes, it is impossible to be completely sealed, but it is no problem for sucking tea leaves during the vacuum pumping operation.

[0048] Further, the vacuum driving holes 100 are opened on the inner shaft sleeve 5212 and there are a plurality of them on the inner shaft sleeve 5212. All the vacuum driving holes 100 are preferably distributed at intervals in a circumferential array on the inner shaft sleeve 5212. The vacuum driving holes 100 penetrate the inner shaft sleeve 5212 radially. There is only one vacuum driving hole 100 on the part of the inner shaft sleeve 5212 where each vacuum driving chamber 10 is located, that is, one vacuum driving chamber 10 is equipped with one vacuum driving hole 100. The telescopic guiding holes 52110 are opened on the outer shaft sleeve 5211. There are also preferably a plurality of telescopic guiding holes 52110 and they are distributed in a circumferential array on the outer shaft sleeve 5211. The telescopic guiding holes 52110 penetrate the outer shaft sleeve 5211 radially, and also one telescopic guiding hole 52110 is equipped for one vacuum driving chamber 10. The vacuum driving holes 100 are preferably located in the central area of the part of the inner shaft sleeve 5212 where the corresponding vacuum driving chamber 10 is located, and the telescopic guiding holes 52110 are preferably located in the central area of the part of the outer shaft sleeve 5211 where the corresponding vacuum driving chamber 10 is located.

[0049] In order for the tea leaf handling tube 1 to better expand and contract and be supported, the aforementioned elastic design is required as follows. An inner positioning plate 5214 extending axially of the driving wheel body 52 is provided in each vacuum driving chamber 10. The inner positioning plate 5214 is integrally connected to the front side of the rear panel 522. The inner positioning plate 5214 is provided with an inner guiding hole 52141 for further guiding the radial expansion and contraction of the tea leaf handling tube 1. The inner guiding hole 52141 radially penetrates the inner positioning plate 5214. The function of the inner guiding hole 52141 is to cooperate with the expansion and contraction guiding hole 52110 to radially guide the tea leaf handling tube 1. The apertures of the two holes can be the same, and the tea leaf handling tube 1 also passes through the inner guiding hole 52141. Further, an annular outer wall baffle 111 is integrally connected to the outer wall of the tea leaf handling tube 1. The outer wall baffle 111 is closer to the axis of the driving wheel body 52 than the inner positioning plate 5214, that is, the outer wall baffle 111 is radially more inward. Then, a radial support spring 1111 is sleeved around the tea leaf handling tube 1 and is located between the inner positioning plate 5214 and the outer wall baffle 111. The inner and outer ends of the radial support spring 1111 in the radial direction respectively abut against the outer wall baffle 111 and the inner positioning plate 5214 to form an elastic support force. In this way, it can be ensured that the tea leaf handling tube 1 has a radial support force. When setting, it should be ensured as much as possible that when the tea leaf handling tube 1 retracts to the innermost position, the radial support spring 1111 is still slightly compressed. In this way, it can be ensured that there is always elastic support during the expansion and contraction process. Because when the tea leaf handling tube 1 extends outwards, the outer wall baffle 111 will approach the inner positioning plate 5214 as it moves radially outwards with the tea leaf handling tube 1, resulting in more compression of the radial support spring 1111 and a greater elastic compression force. Therefore, it can be ensured that there is always an elastic support force during the process of the entire tea leaf handling tube 1 generating a radial displacement. So, it will not become loose and cause excessive freedom and instability, thus affecting reliable operation. In addition, the position of the guide rod 53 is preferably more inward in the radial direction than the outer wall baffle 111. In this way, the guide rod 53 will not affect the structure of the outer wall baffle 111 and the radial support spring 1111 and the realization of elastic support. Each vacuum driving chamber 10 also preferably has a tea leaf handling tube 1 and a guide rod 53 and is located at a position closer to the middle in the circumferential direction. The front end of the axial section 532 of the guide rod 53 is integrally formed with the outer wall of the tea leaf handling tube 1 at a position preferably on the part of the tea leaf handling tube 1 that is more inward in the radial direction, that is, it is preferably integrally connected on the outer wall of the tea leaf handling tube 1 close to the axis. The port of the tea leaf handling tube 1 that is more outward in the radial direction serves as the tea leaf adsorption port. The port of the tea leaf handling tube 1 that is more inward in the radial direction is the port communicating with the vacuum driving chamber 10, that is, the port where the tea leaf handling tube 1 starts to be evacuated, and can also be understood as the inner port and serves as the contact end for vacuum work.

[0050] All of the above-mentioned integrated connections can be achieved by using existing one-piece forming processes. In addition, the overall material of the driving wheel body 52 can be made of plastic structure, which is convenient for one-piece forming. Of course, it can also be made of steel structure, but the weight is relatively heavy. Although the function can be achieved, the cost, energy consumption, etc. will all increase. The embodiment still recommends lightweight materials.

[0051] Preferably, the screening device of this embodiment further includes a frame 4, on which there are fixed mounting columns 41 and a mounting cross beam 42 fixed to the mounting columns 41. The frame 4, the mounting columns 41 and the mounting cross beam 42 can adopt existing structural members and be installed and fixed in an existing manner. And on the mounting cross beam 42, there is fixed a suspension bracket 6 for suspending and hoisting the rotary tea random selection platform and the tea feeding box 2. The suspension bracket 6 hoists the rotary tea random selection platform and the tea feeding box 2 at the same time. The mounting column 41 is in the front. The front end of the mounting cross beam 42 is fixed to the upper end of the mounting column 41. The lower side of the rear part of the mounting cross beam 42 is fixed with the suspension bracket 6. The suspension bracket 6 includes a middle suspension plate 61 extending forward and backward and fixed to the lower side of the mounting cross beam 42, a front suspension plate 62 integrally connected to the front side of the middle suspension plate 61 and extending downward, and a rear suspension plate 63 integrally connected to the rear side of the middle suspension plate 61 and extending downward. The suspension bracket 6 is integrally in an inverted U shape. The front and rear ends of the main fixed shaft 51 are respectively fixed to the lower parts of the front suspension plate 62 and the lower parts of the rear suspension plate 63. The driving wheel body 52 is located between the front suspension plate 62 and the rear suspension plate 63. An anterior extension plate 621 extending leftward or rightward is integrally connected to the front suspension plate 62, and a posterior extension plate 631 extending leftward or rightward is integrally connected to the rear suspension plate 63. The tea feeding box 2 is fixed between the anterior extension plate 621 and the posterior extension plate 631. In this embodiment, assuming that the tea feeding box 2 is on the left side of the rotary tea random selection platform, the anterior extension plate 621 and the posterior extension plate 631 both extend leftward from the left sides of the front suspension plate 62 and the rear suspension plate 63 respectively. The specific structure of the tea feeding box 2 may include a front box plate 21, a rear box plate 22, and side box plates 23 integrally connected between the front box plate 21 and the rear box plate 22. If the tea feeding box 2 is on the left side of the rotary tea random selection platform, specifically on the left side of the driving wheel body 52, then the upper side and the right side of the tea feeding box 2 form openings. The upper opening is used to put the tea material to be screened, and the right opening is used to be close to the left part of the driving wheel body 52. The side box plates 23 block on the left side and the lower side to prevent the tea from leaking. Therefore, the tea feeding box 2 and the driving wheel body 52 should be infinitely close but not affect the rotation of the driving wheel body 52. The left part of the driving wheel body 52 actually seals the right opening of the tea feeding box 2. At the same time, it is also beneficial for the tea handling pipe 1 to directly enter the tea feeding box 2 for tea adsorption and leave the tea feeding box 2 during the rotation on the left side. For the part 231 of the side box plate 23 that forms the left block and the lower side block part 232 integrally connected to the lower side of the left block part, the side box plate 23 preferably can be in a shape with an oblique extension from the upper left to the lower right or a shape approximately with an oblique extension.Further, the right side of the front box plate 21 forms a front arc-shaped near edge 211 that coincides with the left outer periphery of the front panel 521 of the driving wheel body 52, and the right side of the rear box plate 22 forms a rear arc-shaped near edge 221 that coincides with the left periphery of the rear panel 522 of the driving wheel body 52. That is, the front box plate 21 needs to be opposite and close to the front panel 521 left and right, and the rear box plate 22 needs to be opposite and close to the rear panel 522 left and right. The right side of the lower blocking part 232 needs to be close to the front panel 521, the rear panel 522, and the outer shaft sleeve 5211. All of these are as close as possible infinitely. Through such a design, the tea placement area in the tea feeding box 2 can be blocked by the driving wheel body 52 at the rear side, and only the upper side of the tea feeding box 2 is the real opening where tea can be put in. Tea will not leak from the front, back, left, right, and lower sides. The front extension plate 621 is fixedly connected to the front side of the front box plate 21, and the rear extension plate 631 is fixedly connected to the rear side of the rear box plate 22, then the installation can be completed. The side box plate 23 exists at the position extending rightward and downward on the left side of the front box plate 21 and the rear box plate 22. Of course, if the tea feeding box 2 is on the right side of the driving wheel body 52, the structure of the tea feeding box 2 is symmetrically arranged with the above structure about the left-right mirror image on the right side of the driving wheel body 52.

[0052] Further, a rotating drive internal gear ring q1 for its rotation is fixed on the driving wheel body 52. An internal drive gear q2 and a first motor q3 that are located inside the rotating drive internal gear ring q1 and engage with the rotating drive internal gear ring q1 are installed on the suspension bracket 6. The internal drive gear q2 is installed and connected to the first motor q3. The rotating drive internal gear ring q1 can be fixed on the rear surface of the rear panel 522 by an existing fixing method and ensure that the axis of the rotating drive internal gear ring q1 is consistent with the driving wheel body 52. Conventional gear rings and gears can be used for the rotating drive internal gear ring q1 and the internal drive gear q2. The first motor q3 can be fixed on the rear suspension plate 63 and the motor shaft extends forward out of the rear suspension plate 63. The internal drive gear q2 can be fixed at the front end of this motor shaft. The rotating drive internal gear ring q1 and the internal drive gear q2 are located between the rear panel 522 and the rear suspension plate 63. Through such a design, the internal drive gear q2 rotates, thereby driving the rotating drive internal gear ring q1 to rotate. When the rotating drive internal gear ring q1 rotates, the entire driving wheel body 52 can be driven to rotate.

[0053] An example of the entire tea turnover process is as follows: During the working process, the vacuum generator z2 is always on, and the first motor q3 is always on, causing the driving wheel body 52 to rotate. Tea can be added in advance to the tea feeding box 2 and continuously added. As the driving wheel body 52 rotates, the vacuum driving chamber 10, the tea handling pipe 1, the guiding rod 53, the telescopic guiding hole 52110, and the vacuum driving hole 100 all rotate. Taking one group of the vacuum driving chamber 10, the tea handling pipe 1, the guiding rod 53, the telescopic guiding hole 52110, and the vacuum driving hole 100 as an example, before the part 232 where the tea handling pipe 1 rotates from bottom to top on the left side and blocks the lower side of the side box plate 23, according to the design of the radius change of the supporting guiding surface 541 of the central special-shaped guiding block 54, the tea handling pipe 1 will radially contract in advance or just radially contract during the process, so that the radially outer end of the tea handling pipe 1 can avoid the part 232 blocking the lower side of the side box plate 23 and smoothly enter the area of the tea feeding box 2 without affecting the rotation of the driving wheel body 52. Then, according to the design of the radius change of the supporting guiding surface 541 of the central special-shaped guiding block 54, the tea handling pipe 1 will immediately radially extend out of the driving wheel body 52 for a certain length. Thus, not only can the extended part stir the tea, but also, on the outer port of the extended part, it can adsorb a tea leaf. Then it continues to rotate upward, and then rotates rightward and downward. As the vacuum state gradually disappears, when the tea handling pipe 1 is in the lower position of the driving wheel body 52, it can ensure that the tea leaf can fall off.The vacuum state of the tea leaf transfer pipe 1 can be set as follows: Before the tea leaf transfer pipe 1 enters the tea leaf feeding box 2, the vacuum driving hole 100 corresponding to the tea leaf transfer pipe 1 can fall into the range of the arc-shaped vacuum contact hole 5100 in advance, that is, at least part of them start to overlap. Then the vacuum pumping state will act on the vacuum driving chamber 10 through the vacuum driving hole 100 and act on the tea leaf transfer pipe 1. As it rotates, the vacuum degree will reach the optimal state and be maintained. During this maintenance process, it is best to ensure that the tea leaf transfer pipe 1 remains until it leaves the tea leaf feeding box 2. Since the arc length of the arc-shaped vacuum contact hole 5100 does not occupy the entire outer circumference of the fixed shaft, subsequently, the vacuum driving hole 100 will slowly leave the range of the arc-shaped vacuum contact hole 5100, and the vacuum degree will gradually disappear, but not immediately, because the air entering through pores, etc. is not instantaneous and has a process. Therefore, by controlling the length of the arc-shaped vacuum contact hole 5100, it is appropriate that the tea leaf transfer pipe 1 just cannot hold the tea leaves when it is rotated to the lower position. In this way, the tea leaves fall onto the tea leaf discrete distribution and loading turnover table 3. The tea leaf discrete distribution and loading turnover table 3 is movable. Then, at intervals, another adjacent tea leaf transfer pipe 1 will drop a tea leaf after a period of time, and there will be a time difference and a distance difference from the first tea leaf before. Thus, they are discretely distributed. After each tea leaf transfer pipe 1 puts down the tea leaves, it enters the next cycle. By continuously working like this, continuously discretely distributed tea leaves can be transferred to the tea leaf discrete distribution and loading turnover table 3, and then through the screening mechanism, these discrete tea leaves can be subjected to high-precision grading and screening.

[0054] In addition, to better achieve the support of the main fixed shaft 51, the rotation of the driving wheel body 52, the realization of the vacuum mode, the telescoping of the tea leaf handling pipe 1, etc. Specifically, the main fixed shaft 51 is divided into a front guiding section 511, a front supporting section 512, an intermediate vacuum driving section 513, a rear supporting section 514, and a rear guiding section 515 that are integrally connected front and rear. The arc-shaped vacuum contact action holes 5100 are opened at the peripheral parts near the middle of the front and rear of the intermediate vacuum driving section 513. Among them, the intermediate vacuum driving section 513 is hollow and forms a hollow cavity 510, and the front supporting section 512 also needs to be hollow and communicate with the hollow cavity 510. The front guiding section 511 also needs to be hollow and communicate with the hollow area of the front supporting section 512. The front supporting section 512 and the front guiding section 511 are preferably hollow tubes with through ports front and rear. The front port of the front guiding section 511 is connected to the vacuum tube z1, and the other port of the vacuum tube z1 is connected to the vacuum generator z2, so as to realize the vacuum suction path in the vacuum state. Further preferably, the outer diameter of the intermediate vacuum driving section 513 is the largest, the outer diameters of the front supporting section 512 and the rear supporting section 514 are the same and smaller than the outer diameter of the intermediate vacuum driving section 513, and the outer diameters of the front guiding section 511 and the rear guiding section 515 are the same and smaller than the outer diameter of the front supporting section 512. A front bearing 71 is fixedly nested around the front supporting section 512 by an existing method, and a rear bearing 72 is fixedly nested around the rear supporting section 514. The central special-shaped guiding block 54 is a cam and can also be fixed on the rear bearing 72 by a key method, and the central special-shaped guiding block 54 is located between the intermediate vacuum driving section 513 and the rear bearing 72. Two rings of sealing rings m are inlaid on the outer peripheral wall of the intermediate vacuum driving section 513 at intervals front and rear. These two sealing rings m are respectively on the front and rear sides of the arc-shaped vacuum contact action holes 5100. The parts of these two sealing rings m corresponding to the inner shaft sleeve 5212 should be in contact to improve the sealing performance during vacuum pumping. The outer shaft sleeve 5211 can be a cylindrical structure with uniform dimensions. The inner shaft sleeve 5212 covers and surrounds many different structures, and it is advisable to have different designs for the inner diameter and outer diameter dimensions throughout the paragraph. The inner shaft sleeve 5212 is sleeved around the outer periphery of the front bearing 71, the intermediate vacuum driving section 513, the central special-shaped guiding block 54, and the rear bearing 72. For the specific dimension design, the inner diameter dimension of the part of the inner shaft sleeve 5212 at the front bearing 71 should be such that the inner wall of the inner shaft sleeve 5212 is in close contact with the outer ring of the front bearing 71 and realizes an interference fit to achieve rotation, and it can be larger than the outer diameter of the intermediate vacuum driving section 513 to reduce the influence on rotation. The inner diameter dimension of the part of the inner shaft sleeve 5212 at the position of the intermediate vacuum driving section 513 should be such that the inner wall of the inner shaft sleeve 5212 is slightly in contact with the sealing ring m, and it should not be too tight to affect rotation. The thickness of the inner shaft sleeve 5212 is generally controlled at about 1 cm. Then, the outer diameter of the parts of the above two inner shaft sleeves 5212 can be obtained by adding the thickness dimension to the inner diameter. The sizes of the rear bearing 72 and the front bearing 71 can be the same.However, for the convenience of assembly, it is advisable to adopt the same inner diameter and outer diameter for the paragraph of the inner shaft sleeve 5212 between the rear bearing 72 and the central special-shaped guide block 54. For the stability of support, the average diameter dimension of the central special-shaped guide block 54 may be similar to that of the rear bearing 72, but it is special-shaped, with a larger diameter in some parts. And in order to better radially support the radial section 531 of the guide rod 53, it is also advisable to reserve more space inside the inner shaft sleeve 5212. Moreover, since the central special-shaped guide block 54 is stationary, enough space should be reserved between the inner wall of the inner shaft sleeve 5212 and the periphery of the central special-shaped guide block 54. Therefore, the inner diameter of the inner shaft sleeve 5212 between the rear bearing 72 and the central special-shaped guide block 54 must be larger than the outer ring size of the rear bearing 72 and also larger than the outer diameter size of the intermediate vacuum drive section 513. Generally, a 2-cm increase is required. In addition, for the convenience of the radial section 531 to pass through the inner shaft sleeve 5212 and abut against the central special-shaped guide block 54, a basic guide hole 5310 that is radially penetrating and allows the radial section 531 to pass through and can radially guide is provided in the part of the inner shaft sleeve 5212 where the central special-shaped guide block 54 is located. The inner diameter size of the inner shaft sleeve 5212 where the rear bearing 72 is located is the same as the inner diameter size of the central special-shaped guide block 54 where it is located, which is also a large size. This makes it convenient for the central special-shaped guide block 54 to be first placed from the rear, and there is a large space for installation, disassembly, etc., which is more convenient. However, this results in a separation between the outer ring of the rear bearing 72 and the inner shaft sleeve 5212, which will cause the rear bearing 72 to fail and cannot play a role in rotational support. For further improvement, an intermediate shaft sleeve 720 is embedded between the outer diameter of the rear bearing 72 and the inner wall of the position where the inner shaft sleeve 5212 is located. Preferably, there is a tight interference fit between the outer wall of the intermediate shaft sleeve 720 and the inner shaft sleeve 5212, and between the inner wall of the intermediate shaft sleeve 720 and the outer ring of the bearing 72 to achieve transmission. In addition, the front guide section 511 and the rear guide section 515 are used to fix the front and rear suspension plates of the suspension bracket.

[0055] For the convenience of installation and disassembly, the driving wheel body 52 can adopt a front-to-back splicing structure, and the section position of the driving wheel body 52 is in the middle of the telescopic guide hole 52110 and the vacuum drive hole 100, that is, the outer sleeve 5211, the inner sleeve 5212 and the inner partition plate 5213 are an integral structure formed by splicing the front and back halves. For the stability of the splicing, a splicing rod and a splicing hole structure in the front and back directions can be formed on the outer sleeve 5211 or the inner sleeve 5212 for docking, or it can be docked front and back by a pin shaft, or other existing splicing reinforcement methods can be used for reinforcement. Of course, there are mutual limitations between the telescopic guide hole 52110 and the vacuum drive hole 100 and the aforementioned interference fit, and it is not a big problem for the front and back halves of the outer sleeve 5211, the inner sleeve 5212 and the inner partition plate 5213 to fit together. It can also be known that the telescopic guide hole 52110 and the vacuum drive hole 100 are also half holes opened in half front and back, and a complete hole is formed by splicing. This structure has more advantages in terms of assembly convenience.

[0056] Embodiment 2, referring to the attached figure in Embodiment 1, is a tea grading and screening device. The difference of this embodiment lies in the further improvement of the screening mechanism of Embodiment 1.

[0057] Specifically, the discretely distributed tea leaves bearing turnover table 3 is installed and connected to the second motor d located at its lower side and for horizontal rotation thereof. The discretely distributed tea leaves bearing turnover table 3 rotates horizontally, and the second motor d uses the existing motor and installation connection method to make the discretely distributed tea leaves bearing turnover table 3 rotate horizontally. Of course, the discretely distributed tea leaves bearing turnover table 3 will be connected to the existing transmission structure such as the supporting shaft, bearing, gear, etc., and then be rotationally connected with the second motor d through the transmission structure, and these structures can be installed and connected to the frame 4.

[0058] The screening mechanism includes a camera mechanism for photographing the tea leaves on the tea leaf discrete distribution and carrying turntable 3, a plurality of tea grading and screening collection pools 31 located outside the tea leaf discrete distribution and carrying turntable 3, and a plurality of air blowing pipes 32 for blowing and collecting the tea leaves on the tea leaf discrete distribution and carrying turntable 3 into the corresponding tea grading and screening collection pools 31. The air blowing pipes 32 are connected to the air blowing mechanism. The screening mechanism further includes a microprocessor for controlling the operation of the camera mechanism and the air blowing mechanism. The microprocessor drives the corresponding air blowing pipe 32 to blow the corresponding tea leaves into the corresponding tea grading and screening collection pool 31 according to the photographing situation of the camera mechanism on the tea leaves. The tea leaf discrete distribution and carrying turntable 3 can be made of a glass plate, which is convenient for the camera mechanism to take pictures. The camera mechanism can include a first camera s1 upstream and a second camera s2 downstream. The cameras can be industrial cameras. Upstream refers to the starting position where the tea leaves just falling from the tea leaf conveying pipe 1 rotate. Pre-shooting is carried out. The second camera s2 is at the position where the falling tea leaves pass through the tea leaf discrete distribution and carrying turntable 3 and rotate to the position of the air blowing pipe 32 for blowing and screening the tea leaves. The tea grading and screening collection pool 31 can adopt a conventional tea collection container. The air blowing pipe 32 and the air blowing mechanism can both adopt existing structures, and the microprocessor can also adopt an existing processor. These components can all be installed on the rack. The tea leaf discrete distribution and carrying turntable 3 is an annular plate. A plurality of air blowing pipes 32 are arranged at intervals along the circumferential direction in the inner circle of the tea leaf discrete distribution and carrying turntable 3, and the outlet pipe diameter of the air blowing pipe 32 faces outward. The other pipe orifice of the air blowing pipe 32 is connected to the air blowing mechanism. The air blowing pipes 32 are marked for blowing different grades of tea leaves and numbered. Theoretically, the more the better. Each air blowing pipe 32 corresponds to an air blowing mechanism and a tea grading and screening collection pool 31. The microprocessor, through existing algorithms and learning models, by inputting pictures and parameters of tea leaves of different sizes, different colors, and with or without defects, pre-divides different grades of tea leaf categories. It can be simply divided or refined. Then, the tea leaves photographed on site are compared with the tea leaves pre-divided by the system. Whichever has a higher similarity belongs to that tea leaf category. Each tea leaf category corresponds to an air blowing mechanism. In the specific implementation process, when the tea leaves turned over are successively turned over through the tea leaf discrete distribution and carrying turntable 3, the first camera s1 starts taking pictures, and the microprocessor successively judges which category the passing tea leaves belong to for the first grading. The tea leaf discrete distribution and carrying turntable 3 continues to rotate. When it enters the downstream screening area, the second camera s2 takes pictures again. One is to confirm the entry of the tea leaves and the other is to re-grade again. Through double-vision detection, it is avoided that the screening effect is reduced due to insufficient single-vision screening of the tea leaves. According to the grading result finally evaluated after the second camera s2 takes pictures, the corresponding air blowing pipe 32 is designated to blow the tea leaves into the corresponding tea grading and screening collection pool 31.The tea leaves are blown into the corresponding tea grading, screening and collecting pool 31 by blowing air. The horizontal position of the air outlet of the air blowing pipe 32 should be as level as the horizontal position of the tabletop of the tea leaf discrete distribution and carrying turntable 3, so that the blowing effect is better.

[0059] The above implementation method can screen the discrete tea leaves well. Of course, other screening methods with visual recognition, such as a complex insect recognition and screening system, can be introduced into this equipment. However, the blowing method of this embodiment is recommended for the final tea collection, which is more effective and not easy to damage the tea leaves.

[0060] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A tea grading and screening device, characterized in that, It includes a rotary tea random selection platform that can rotate and pick up and place tea. Multiple tea handling tubes (1) that are circumferentially spaced apart are provided on the rotary tea random selection platform. The tea handling tubes (1) can expose the rotary tea random selection platform and are used for adsorbing and dropping tea. A tea feeding box (2) for holding tea is provided near the periphery of the rotary tea random selection platform and can be entered by the tea handling tubes (1). A tea discrete distribution bearing and turnover platform plate (3) for dropping and turning over tea is provided below the rotary tea random selection platform. It also includes a screening mechanism for screening the tea on the tea discrete distribution bearing and turnover platform plate (3).

2. The tea grading and screening device according to claim 1, wherein The axis of the rotary tea random selection platform is in the horizontal direction. The tea handling tube (1) can be telescopic in the radial direction of the rotary tea random selection platform. The tea handling tube (1) adsorbs tea by means of vacuum extraction. The radially outer port of the tea handling tube (1) serves as a tea adsorption port and can enter the tea feeding box (2).

3. The tea grading and screening device according to claim 2, characterized in that, All the tea handling tubes (1) are arranged in a circumferential array on the rotary tea random selection platform. The tea handling tube (1) is a straight tube structure.

4. The tea grading and screening device according to claim 2, wherein The rotary tea random selection platform includes a main fixed shaft (51) that plays a supporting role and a driving wheel body (52) that is sleeved on the main fixed shaft (51) and can rotate around the main fixed shaft (51). The tea handling tube (1) is radially arranged on the driving wheel body (52) along the radial direction of the driving wheel body (52) and can be telescopic in the radial direction. A radial telescopic displacement forming component for enabling the tea handling tube (1) to be telescopic is provided inside the driving wheel body (52).

5. The tea grading and screening device according to claim 4, wherein, The radial telescopic displacement forming component includes a guiding rod (53) fixedly connected to the outer wall of the tea handling tube (1) and a central special-shaped guiding block (54) that cooperates with the guiding rod (53) and is fixedly arranged on the main fixed shaft (51). A supporting and guiding curved surface (541) for supporting and moving the guiding rod (53) in the radial direction is formed on the outer surface of the central special-shaped guiding block (54). At least a part of the continuous section of the supporting and guiding curved surface (541) has a different length dimension from the axis.

6. The tea grading and screening device according to claim 5, wherein The central special-shaped guiding block (54) is a cam. The supporting and guiding curved surface (541) is formed on the outer peripheral surface of the central special-shaped guiding block (54), and at least one section with a changing radius is arranged near the tea feeding box (2). The guiding rod (53) includes a radial section (531) extending radially and an axial section (532) fixedly connected perpendicularly to the radial section (531). The axial section (532) is fixedly connected to the outer wall of the tea handling tube (1). The end of the radial section (531) near the axis forms an arc-shaped end (5311) and is used for abutting against and relatively moving with the supporting and guiding curved surface (541).

7. An apparatus for grading and screening tea leaves according to claim 6, wherein, A vacuum driving chamber (10) is formed inside the driving wheel body (52), which is circumferentially and independently separated and into which each tea conveying pipe (1) is inserted for taking and placing tea in a vacuum manner. A hollow cavity (510) is formed in the main fixed shaft (51), and the part where the hollow cavity (510) is located is connected to a vacuum generator (z2) through a vacuum pipe (z1). An arc-shaped vacuum contacting hole (5100) extending circumferentially and capable of communicating with the vacuum driving chamber (10) is formed on the part where the hollow cavity (510) is located. A vacuum driving hole (100) communicating with the arc-shaped vacuum contacting hole (5100) is formed at a position on the inner side of the driving wheel body (52) radially close to the axis in the vacuum driving chamber (10). A telescopic guiding hole (52110) communicating with the arc-shaped vacuum contacting hole (5100) and through which the tea conveying pipe (1) passes for telescopic guiding is formed at a position on the outer side of the driving wheel body (52) radially away from the axis in the vacuum driving chamber (10).

8. The tea grading and screening device according to claim 2, wherein, It further includes a frame (4), on which an installation column (41) and an installation cross beam (42) fixed to the installation column (41) are provided. A suspension bracket (6) for hanging and hoisting the rotary tea random selection platform and the tea discharging box (2) is fixed on the installation cross beam (42).

9. An apparatus for grading and screening tea leaves according to claim 8, wherein, A rotating driving internal gear ring (q1) for the rotation of the driving wheel body (52) is fixed on the driving wheel body (52). An internal driving gear (q2) meshing with the rotating driving internal gear ring (q1) and a first motor (q3) are installed on the suspension bracket (6) and located inside the rotating driving internal gear ring (q1). The internal driving gear (q2) is installed and connected to the first motor (q3).

10. A tea grading and screening device according to claim 1, wherein, The tea discrete distribution bearing and turnover table board (3) is installed and connected to a second motor (d) located below it for horizontal rotation. The screening mechanism includes a camera mechanism for photographing the tea on the tea discrete distribution bearing and turnover table board (3), a plurality of tea grading and screening collection pools (31) located around the tea discrete distribution bearing and turnover table board (3), and a plurality of air blowing pipes (32) for blowing and collecting the tea on the tea discrete distribution bearing and turnover table board (3) into the corresponding tea grading and screening collection pools (31). The air blowing pipes (32) are connected to an air blowing mechanism. The screening mechanism further includes a microprocessor for controlling the operation of the camera mechanism and the air blowing mechanism. The microprocessor drives the corresponding air blowing pipes (32) to blow the corresponding tea into the corresponding tea grading and screening collection pools (31) according to the photographing situation of the tea by the camera mechanism.

Images