Tartary buckwheat grading and screening device

Abstract

The utility model discloses a kind of tartary buckwheat grading screening devices, the utility model relates to tartary buckwheat production technical field, scheme includes: a kind of tartary buckwheat grading screening device, including: pedestal;Two bearing supports, two bearing supports are respectively installed in the two sides of pedestal;Driving main shaft, driving main shaft penetrates two bearing supports, and driving main shaft is rotatably connected with two bearing supports;Driving assembly, driving assembly can drive driving main shaft rotation;Primary screen cylinder, primary screen cylinder is sleeved on the outside of driving main shaft;Secondary screen cylinder, secondary screen cylinder is sleeved on the outside of primary screen cylinder;Linkage sleeve, linkage sleeve is sleeved on the outside of driving main shaft;Multiple synchronous shafts, multiple synchronous shafts are distributed along the circumferential direction, one end of synchronous shaft is connected with linkage sleeve, and the other end of synchronous shaft is connected with secondary screen cylinder after penetrating primary screen cylinder;Classified screening of two kinds of impurities can be realized synchronously, reduce artificial cost and process time consumption, improve tartary buckwheat raw material pretreatment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of buckwheat production technology, specifically to a buckwheat grading and screening device. Background Technology

[0002] After buckwheat harvest, the raw material system naturally contains field-derived impurities, which will constitute a core constraint on improving the efficiency of subsequent processing chains and ensuring the stability of end product quality. Field-derived impurities mainly include weeds, straw, large-diameter gravel, lumpy soil, and broken grains. If they are not thoroughly removed through pre-treatment processes, they will cause two-way damage to subsequent processing equipment: on the one hand, hard large-diameter gravel will generate rigid friction with the hulling machine rollers and grinding components of the mill, while increasing the frequency and cost of equipment maintenance; on the other hand, flexible weeds and straw are prone to entanglement in transmission components during equipment operation, causing mechanical blockages and unplanned interruptions in the production process.

[0003] A buckwheat screening device disclosed in authorization announcement number (CN220716701U) includes a support frame, a working platform, and a screening frame. The working platform is fixed to the surface of the support frame, and a support is provided on the surface of the working platform. In the raw material pretreatment stage of buckwheat tea production, after the buckwheat raw material is put into the screening frame, the screening frame is controlled to generate reciprocating up-and-down vibration. Under this vibration, the buckwheat raw material in the screening frame dynamically tumbles, realizing the screening and purification of the buckwheat raw material.

[0004] The structure disclosed in this patent has defects in practical applications, specifically as follows: a single screening operation can only achieve unidirectional screening of impurities with particle sizes larger or smaller than buckwheat, and cannot simultaneously separate two types of impurities with different particle sizes. If the process requirement of simultaneously removing two types of impurities is required, the machine must be manually stopped to replace the screen with the corresponding aperture size and then restarted for a second screening. This operation mode not only increases the complexity of the process and the cost of manual intervention, but also prolongs the raw material pretreatment cycle. Utility Model Content

[0005] The purpose of this utility model is to provide a buckwheat grading and screening device, which addresses the problem in the existing technology that can only achieve unidirectional screening of impurities larger or smaller than the buckwheat particle size in a single operation, and cannot simultaneously complete the separation of the two types of impurities. The device can simultaneously achieve the grading and screening of the two types of impurities, reduce labor costs and process time, and improve the pretreatment efficiency of buckwheat raw materials.

[0006] This utility model is achieved through the following technical solution: A buckwheat grading and screening device includes: a base; two bearing supports, each mounted on one side of the base; a drive shaft passing through the two bearing supports and rotatably engaging with them; a drive assembly capable of driving the drive shaft to rotate; a primary screen cylinder fitted around the outside of the drive shaft; a secondary screen cylinder fitted around the outside of the primary screen cylinder; a linkage sleeve fitted around the outside of the drive shaft; and multiple synchronous shafts distributed circumferentially, one end of each shaft connected to the linkage sleeve, and the other end passing through the primary screen cylinder and connecting to the secondary screen cylinder. The primary screen cylinder is inclined along the material conveying direction, and its lower end face is sealed. The secondary screen cylinder is also inclined along the material conveying direction. The lower end face of the secondary screen cylinder is sealed; a feed port is provided on the bearing support corresponding to the upper end of the primary screen cylinder, and the feed port is connected to the upper end of the primary screen cylinder; a second discharge section is provided at the lower end of the secondary screen cylinder, and multiple second discharge holes are provided in the second discharge section along the circumferential direction; a second adjusting ring is rotatably fitted on the outer side of the second discharge section, and multiple second linkage holes are provided in the second adjusting ring along the circumferential direction; a third positioning hole and a fourth positioning hole are provided on the second discharge section; a second locking seat is installed on the second adjusting ring, and a second receiving groove is provided on the second locking seat. A second locking pin passes through the second adjusting ring in the second receiving groove, and a second spring is sleeved on the outer side of the second locking pin; one end of the second spring is connected to the outer wall of the second locking pin, and the other end of the second spring is connected to the inner wall of the second receiving groove.

[0007] Furthermore, in this utility model, a first discharge section is provided at the lower end of the primary screen cylinder, and the first discharge section has a plurality of first discharge holes along the circumferential direction; a first adjusting ring is rotatably fitted on the outer side of the first discharge section, and the first adjusting ring has a plurality of first linkage holes along the circumferential direction; wherein, in the screening state, the first adjusting ring is locked to a first preset position, and the plurality of first linkage holes are completely offset from the plurality of first discharge holes; in the discharge state, the first adjusting ring is locked to a second preset position, and the plurality of first linkage holes are connected to the plurality of first discharge holes to form a discharge channel.

[0008] Furthermore, in this utility model, the first discharge section is provided with a first positioning hole and a second positioning hole; a first locking seat is installed on the first adjusting ring, the first locking seat is provided with a first receiving groove, a first locking pin passing through the first adjusting ring is provided in the first receiving groove, and a first spring is sleeved on the outside of the first locking pin; one end of the first spring is connected to the outer wall of the first locking pin, and the other end of the first spring is connected to the inner wall of the first receiving groove; wherein, in the screening state, the first locking pin is inserted into the first positioning hole under the action of the first spring, so that the first adjusting ring is locked in the first preset position; in the discharge state, the first locking pin is inserted into the second positioning hole under the action of the first spring, so that the first adjusting ring is locked in the second preset position.

[0009] Furthermore, in this utility model, the aforementioned driving component includes: a support mounted on a base; and a motor mounted on the support, with the motor's output end connected to a drive shaft, thereby enabling the primary screen cylinder and the secondary screen cylinder to rotate synchronously.

[0010] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. This utility model utilizes coaxially nested primary and secondary screen cylinders, combined with differentiated configurations of primary and secondary screen apertures, and a synchronous transmission system consisting of a linkage sleeve and a synchronous shaft, to achieve single-operation two-stage grading and screening of buckwheat raw materials. This design effectively avoids the limitation of traditional screening equipment requiring shutdown for screen replacement and a second operation to separate the two types of impurities, significantly shortening the raw material pretreatment cycle and improving the continuity and efficiency of buckwheat screening in large-scale production.

[0011] 2. This utility model provides a working space for operators to adjust the inner first adjusting ring by switching the second adjusting ring to the fourth preset position to form a through operating channel. This design effectively avoids the cumbersome process of disassembling the outer layer to adjust the inner components in the traditional double screen cylinder structure, reducing labor time and avoiding contact between the operator's hands and the rotating parts, thus improving the convenience and safety of equipment adjustment. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 A schematic diagram of a buckwheat grading and screening device; Figure 2 A schematic diagram showing the drive spindle mounted on two bearing supports; Figure 3 This is a schematic diagram showing the relative positions of the primary sieve cylinders. Figure 4 This is an exploded view of the secondary screen cylinder and the second adjusting ring; Figure 5 This is a cross-sectional view of the second lock seat; Figure 6 This is an exploded view of the primary sieve cylinder and the first adjusting ring; Figure 7 This is a cross-sectional view of the first lock seat.

[0013] The attached diagram shows the markings and corresponding component names: 1-Base, 2-Bearing support, 3-Secondary screen cylinder, 4-Primary screen cylinder, 5-Linkage sleeve, 6-Synchronous shaft, 7-Drive spindle, 8-Feed port, 9-Second adjusting ring, 10-Second linkage hole, 11-Second discharge section, 12-Second discharge hole, 13-Fourth positioning hole, 14-Third positioning hole, 15-Second locking seat, 16-Second locking pin, 17-Second receiving groove, 18-Second spring, 19-First discharge section, 20-First discharge hole, 21-Second positioning hole, 22-First positioning hole, 23-First adjusting ring, 24-First linkage hole, 25-First locking seat, 26-First locking pin, 27-First receiving groove, 28-First spring. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model. Example

[0015] Please refer to Figures 1 to 7 This utility model provides a buckwheat grading and screening device. It includes a base 1, two bearing supports 2, a drive shaft 7, a drive assembly, a primary sieve cylinder 4, a secondary sieve cylinder 3, a linkage sleeve 5, and multiple synchronous shafts 6. The two bearing supports 2 are symmetrically distributed on both sides of the base 1, and a bearing is embedded in the inner hole of each bearing support 2; both ends of the drive shaft 7 are coaxially inserted into the inner rings of the two bearings. The drive assembly is connected to one end of the drive shaft 7 to provide power for the drive shaft 7 to rotate around its own axis.

[0016] The inner wall of the linkage sleeve 5 is fixedly connected to the outer peripheral wall of the drive shaft 7, forming an integrated structure that rotates synchronously with the drive shaft 7. Multiple synchronous shafts 6 are evenly spaced along the circumference of the linkage sleeve 5, with one end of each synchronous shaft 6 fixedly connected to the outer peripheral wall of the linkage sleeve 5. The primary sieve cylinder 4 is a cylindrical structure open at both ends, coaxially fitted onto the outside of the drive shaft 7. The end of each synchronous shaft 6 away from the linkage sleeve 5 penetrates the wall of the primary sieve cylinder 4, and the wall of the primary sieve cylinder 4 is fixedly connected to each synchronous shaft 6, thus establishing a transmission connection between the primary sieve cylinder 4 and the linkage sleeve 5 through the synchronous shafts 6. The secondary sieve cylinder 3 is also a cylindrical structure open at both ends, coaxially fitted onto the outside of the primary sieve cylinder 4. After each synchronous shaft 6 penetrates the primary sieve cylinder 4, the end of each synchronous shaft 6 is fixedly connected to the inner wall of the secondary sieve cylinder 3, thereby enabling the secondary sieve cylinder 3 and the primary sieve cylinder 4 to synchronously drive the drive shaft 7 to rotate.

[0017] The primary sieve cylinder 4 has several through-holes in its cylinder wall, and the secondary sieve cylinder 3 has several through-holes in its cylinder wall. The diameter of the primary sieve holes is larger than that of the secondary sieve holes, so as to achieve the grading and screening of materials with different particle sizes. During the buckwheat screening operation, the buckwheat material to be screened is fed into the inner cavity of the primary sieve cylinder 4 from one end. The drive assembly drives the drive shaft 7 to rotate, and the drive shaft 7 drives each synchronous shaft 6 to rotate synchronously through the linkage sleeve 5. The synchronous shaft 6 further drives the primary sieve cylinder 4 and the secondary sieve cylinder 3 to rotate synchronously around the axis of the drive shaft 7.

[0018] During the rotation of the primary screen cylinder 4, the buckwheat material in its inner cavity is turned over by the combined action of centrifugal force and gravity, so that the material is in full contact with the cylinder wall of the primary screen cylinder 4. Among them, buckwheat particles with a particle size smaller than the aperture of the primary screen and small particle size impurities fall into the inner cavity of the secondary screen cylinder 3 through the primary screen holes, while large particle size impurities with a particle size larger than the aperture of the primary screen are trapped in the inner cavity of the primary screen cylinder 4, thus achieving the first stage of screening.

[0019] When the secondary sieve cylinder 3 rotates synchronously, the buckwheat particles and small-diameter impurities inside its cavity also tumble and fully contact the cylinder wall. Small-diameter impurities smaller than the secondary sieve apertures pass through and are discharged to the outside of the secondary sieve cylinder 3, while buckwheat particles larger than the secondary sieve apertures are retained inside the secondary sieve cylinder 3, achieving a second stage of screening. After the screening operation is completed, the operator collects the buckwheat particles inside the secondary sieve cylinder 3 to obtain clean buckwheat free of the two types of impurities, thus completing the buckwheat grading and screening process.

[0020] Please refer to Figure 2 It should be noted that a single linkage unit consists of a linkage sleeve 5 and multiple synchronous shafts 6 evenly distributed along its circumference. Multiple linkage units are spaced apart along the axis of the drive shaft 7, which can form multi-point synchronous support and power transmission from different axial positions of the primary screen cylinder 4 and the secondary screen cylinder 3. This effectively disperses the radial load and axial torque generated during the rotation of the screen cylinder, avoids screen cylinder deformation or transmission jamming caused by a single linkage unit support, and thus ensures the structural rigidity and transmission reliability of the entire screening device during long-term operation.

[0021] In some embodiments of this application, the primary screen cylinder 4 and the secondary screen cylinder 3 are both arranged at an inclination along the material conveying path. The low end face of the primary screen cylinder 4 and the low end face of the secondary screen cylinder 3 are both set as sealed structures. A feed port 8 is provided on the bearing support 2 on the high end side of the primary screen cylinder 4. One end of the feed port 8 is connected to the external feeding end, and the other end is connected to the high end inner cavity of the primary screen cylinder 4, forming a channel for the buckwheat material to be screened to enter the inner cavity of the primary screen cylinder 4.

[0022] The inclined arrangement of the primary screen cylinder 4 allows the material inside to be conveyed towards the lower end of the primary screen cylinder 4 under the combined action of gravity and centrifugal force as it rotates with the drive shaft 7. The sealing design of the lower end face of the primary screen cylinder 4 effectively intercepts the material conveyed there, preventing it from leaving the primary screen cylinder 4 before completing the primary screening. This ensures sufficient time for the material to tumble and interact with the primary screen openings to complete the first stage of particle size screening. The inclined arrangement and sealing design of the lower end face of the secondary screen cylinder 3 are completely consistent with those of the primary screen cylinder 4, ensuring that the material entering the secondary screen cylinder 3 after the primary screening process also maintains sufficient screening time within the secondary screen cylinder 3, thus reliably completing the second stage of particle size screening.

[0023] It should be noted that both the primary screen cylinder 4 and the secondary screen cylinder 3 adopt an inclined arrangement structure, and the drive shaft 7, the primary screen cylinder 4, and the secondary screen cylinder 3 are coaxially arranged. The coaxial design ensures that when the drive shaft 7 drives the primary screen cylinder 4 and the secondary screen cylinder 3 to rotate synchronously, it effectively avoids operational interference problems such as radial friction and collision between components caused by misalignment of the axes.

[0024] Please refer to Figure 4 In some embodiments of this application, the lower end of the secondary screen cylinder 3 is provided with a second discharge section 11 integrally formed therewith. The peripheral wall of the second discharge section 11 is evenly provided with a plurality of through second discharge holes 12 along the circumferential direction. The outer peripheral wall of the second discharge section 11 is rotatably fitted with a second adjusting ring 9 through a clearance fit. The peripheral wall of the second adjusting ring 9 is provided with a plurality of second linkage holes 10 correspondingly along the circumferential direction. The diameter of each second linkage hole 10 is consistent with the diameter of the second discharge hole 12, and the distribution angle along the circumferential direction is matched one by one.

[0025] In the screening state, the second adjusting ring 9 is fixed in the third preset position. At this time, each of the second linkage holes 10 and the corresponding second discharge holes 12 are completely offset, so that the discharge channel of the second discharge section 11 is in a closed state, ensuring that the material in the inner cavity of the secondary screen cylinder 3 is effectively intercepted and fully contacts the cylinder wall to complete the secondary screening during the synchronous rotation of the secondary screen cylinder 3. After the material in the secondary screen cylinder 3 is screened, the second adjusting ring 9 is rotated to the fourth preset position and locked again. At this time, each of the second linkage holes 10 and the corresponding second discharge holes 12 are aligned and connected to form a material discharge channel. When the secondary screen cylinder 3 continues to rotate, the screened material in its inner cavity converges to the second discharge section 11 under the combined action of gravity and centrifugal force, and is finally discharged from the secondary screen cylinder 3 through the connected discharge channel.

[0026] It should be noted that the second adjusting ring 9 is assembled with the second discharge section 11 through a guide structure. The guide structure provides a unidirectional constraint on the motion freedom of the second adjusting ring 9, allowing the second adjusting ring 9 to rotate only along the circumference of the second discharge section 11. An elastic layer (rubber) is fixed to the inner wall of the second adjusting ring 9. This elastic layer maintains surface contact with the outer peripheral wall of the second discharge section 11. In the screening state, it can strengthen the sealing effect when the second linkage hole 10 and the second discharge hole 12 are misaligned through elastic compression, effectively blocking the unexpected leakage channels of materials. In the discharge state, the elastic layer can rely on its own deformation characteristics to form a guiding constraint on the material passing through the connecting channel, improving the smoothness and directionality of material discharge.

[0027] Please refer to Figure 4 and Figure 5 Specifically, the outer peripheral wall of the second discharge section 11 is provided with a third positioning hole 14 and a fourth positioning hole 13 radially, and the two positioning holes are spaced at a preset angle along the circumference of the second discharge section 11; the outer peripheral wall of the second adjusting ring 9 is fixed with a second locking seat 15, and a second receiving groove 17 extending radially along the second adjusting ring 9 is provided in the second locking seat 15. A second locking pin 16 is slidably inserted in the second receiving groove 17. The inner end of the second locking pin 16 passes through the second adjusting ring 9 and can be fitted into the third positioning hole 14 or the fourth positioning hole 13. The outer end of the second locking pin 16 extends to the outside of the second locking seat 15. A second spring 18 sleeved in the second receiving groove 17 is connected at one end to the outer wall of the second locking pin 16 and at the other end to the inner side wall of the second receiving groove 17. The second spring 18 can provide an elastic force to make the second locking pin 16 fit into the positioning hole.

[0028] In the screening state, the second locking pin 16 is inserted into the third positioning hole 14 under the elastic force of the second spring 18, so that the second adjusting ring 9 is locked in the third preset position. At this time, each second linkage hole 10 is completely offset from the corresponding second discharge hole 12. When switching to the discharge state, the operator pulls the second locking pin 16 outward to overcome the spring force and disengage it from the third positioning hole 14. After rotating the second adjusting ring 9 to the fourth preset position, the pin is released. The second locking pin 16 is inserted into the fourth positioning hole 13 under the action of the second spring 18, so that the second adjusting ring 9 is locked in the fourth preset position. At this time, each second linkage hole 10 is aligned and connected with the corresponding second discharge hole 12 to form a material discharge channel.

[0029] It should be noted that both ends of the second groove 17 are equipped with sealing structures. This double-sealing design, through the structural characteristics of a sliding seal, ensures that the second locking pin 16 moves axially along the second groove 17 without additional resistance, guaranteeing the responsiveness of locking and unlocking actions. It also forms a fully enclosed protection for the inner cavity of the second groove 17, effectively preventing the intrusion of dust, particles, and other impurities from the external environment, and avoiding the adhesion of impurities to the surface of the second spring 18, which could lead to a decrease in the elastic coefficient. Please refer to Figure 6 and Figure 7 In some embodiments of this application, the working principle of the first adjusting ring 23 is completely the same as that of the aforementioned second adjusting ring 9, relying on the same locking structure to achieve state fixation: from a functional perspective, both achieve state fixation by rotating the adjusting ring relative to the discharge section, so that the linkage hole on the adjusting ring and the discharge hole on the discharge section are either staggered or connected, corresponding to material interception in the screening stage and material discharge in the discharge stage, respectively; from a locking mechanism perspective, both achieve locking of the adjusting ring in the corresponding working position by means of an elastic locking assembly composed of a locking seat, a locking pin, and a spring, ensuring the switching between screening and discharge states; therefore, the specific working process of the first adjusting ring 23 will not be elaborated further.

[0030] It should be noted that when adjusting the first adjusting ring 23, the operator must first rotate the second adjusting ring 9 to the fourth preset position so that the multiple second linkage holes 10 and the multiple second discharge holes 12 are aligned and connected to form a through operating channel. The operating channel provides the operator with working space to access the inner first adjusting ring 23, ensuring that the operator can pass through the operating channel to adjust the state of the first adjusting ring 23 located inside it, ensuring the accessibility and convenience of the adjustment action.

[0031] In some embodiments of this application, the support is rigidly connected to the pre-set mounting surface of the base 1, and the motor is detachably mounted on the power output end of the support; the output shaft of the motor and the input end of the drive shaft 7 are coaxially connected via a coupling. The power of the motor can be transmitted to the drive shaft 7, which then drives the primary screen cylinder 4 and the secondary screen cylinder 3 to rotate at the same speed through the transmission action of the linkage unit, providing a power source for the tumbling and screening of materials within the screen cylinders. This part of the structure is prior art in this field and is therefore not shown in the accompanying drawings.

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for fractionating and sieving tartary buckwheat, characterized by, include: Base (1); Two bearing supports (2) are respectively installed on both sides of the base (1); A drive spindle (7) passes through two bearing supports (2), and the drive spindle (7) is rotatably engaged with the two bearing supports (2); A drive assembly capable of driving the drive spindle (7) to rotate; Primary sieve cylinder (4), which is fitted onto the outside of the drive spindle (7); The secondary sieve cylinder (3) is fitted onto the outside of the primary sieve cylinder (4); Linkage sleeve (5), which is fitted onto the outside of the drive spindle (7); Multiple synchronous shafts (6) are distributed along the circumferential direction. One end of each synchronous shaft (6) is connected to the linkage sleeve (5), and the other end of each synchronous shaft (6) passes through the primary screen cylinder (4) and is connected to the secondary screen cylinder (3). The primary screen cylinder (4) is arranged at an angle along the material conveying direction, and the lower end face of the primary screen cylinder (4) is sealed. The secondary screen cylinder (3) is arranged at an inclination along the material conveying direction, and the lower end face of the secondary screen cylinder (3) is sealed. A feed port (8) is provided on the bearing support (2) at the high end of the primary screen cylinder (4), and the feed port (8) is connected to the high end of the primary screen cylinder (4). The secondary screen cylinder (3) is provided with a second discharge section (11) at its lower end, and the second discharge section (11) is provided with a plurality of second discharge holes (12) along the circumferential direction. The outer side of the second discharge section (11) is fitted with a second adjusting ring (9), and the second adjusting ring (9) is provided with multiple second linkage holes (10) along the circumferential direction. The second discharge section (11) is provided with a third positioning hole (14) and a fourth positioning hole (13). A second lock seat (15) is installed on the second adjusting ring (9). A second receiving groove (17) is provided on the second lock seat (15). A second locking pin (16) that passes through the second adjusting ring (9) is provided in the second receiving groove (17). A second spring (18) is sleeved on the outside of the second locking pin (16). One end of the second spring (18) is connected to the outer wall of the second locking pin (16), and the other end of the second spring (18) is connected to the inner wall of the second receiving groove (17).

2. The tartary buckwheat fractionating and screening apparatus according to claim 1, characterized in that, The primary screen cylinder (4) is provided with a first discharge section (19) at its lower end, and the first discharge section (19) is provided with a plurality of first discharge holes (20) along the circumferential direction. The outer side of the first discharge section (19) is fitted with a first adjusting ring (23), and the first adjusting ring (23) has multiple first linkage holes (24) along the circumferential direction. In the screening state, the first adjusting ring (23) is locked to the first preset position, and the plurality of first linkage holes (24) are completely offset from the plurality of first discharge holes (20); In the discharge state, the first adjusting ring (23) is locked to the second preset position, and the multiple first linkage holes (24) are respectively connected to the multiple first discharge holes (20) to form a discharge channel.

3. The tartary buckwheat fractionating and screening apparatus according to claim 2, characterized in that, The first discharge section (19) is provided with a first positioning hole (22) and a second positioning hole (21); A first lock seat (25) is installed on the first adjusting ring (23), a first receiving groove (27) is provided on the first lock seat (25), a first locking pin (26) that passes through the first adjusting ring (23) is provided in the first receiving groove (27), and a first spring (28) is sleeved on the outside of the first locking pin (26). One end of the first spring (28) is connected to the outer wall of the first locking pin (26), and the other end of the first spring (28) is connected to the inner wall of the first receiving groove (27); In the screening state, the first locking pin (26) is inserted into the first positioning hole (22) under the action of the first spring (28), so that the first adjusting ring (23) is locked in the first preset position; In the discharge state, the first locking pin (26) is inserted into the second positioning hole (21) under the action of the first spring (28), so that the first adjusting ring (23) is locked in the second preset position.

4. The tartary buckwheat fractionating and screening apparatus according to any one of claims 1 to 3, characterized in that, The driving component includes: Support, which is mounted on the base (1); The motor is mounted on the support and its output end is connected to the drive shaft (7), thereby enabling the primary screen cylinder (4) and the secondary screen cylinder (3) to rotate synchronously.

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