A sieving device for finely sieving glutinous rice flour.

Abstract

This invention discloses a sieving device for finely sieving glutinous rice flour, comprising a frame, a sieving chamber, and a sieving mechanism. The sieving chamber is connected to the discharge hopper. The sieving mechanism can be pulled out from the left side of the sieving chamber. A feed box is fixedly installed on the right side of the sieving chamber, and a feed pipe is connected to the upper side of the feed box. The side cover plate and the feed end seat of the sieving mechanism are respectively fixedly installed at both ends of the support frame. A rotatable screen cage is provided at the support frame. A central rotating shaft passes through the support frame, and a rotating wheel and a powder-dispersing rotating cylinder for cooperating with the feed end seat are installed at the central rotating shaft. This invention can not only sieving the flour but also break up damp and clump-like glutinous rice flour, effectively solving the technical problem of mis-sieving clumps. Furthermore, while the central rotating shaft rotates, it can also drive a translation seat through the rotating wheel, which in turn drives the screen cage to deflect, causing the glutinous rice flour accumulated on the upper side of the screen cage to automatically fall into the discharge hopper.

Description

Technical Field

[0001] This invention relates to the field of glutinous rice flour sieving technology, and in particular to a sieving device for finely sieving glutinous rice flour. Background Technology

[0002] Glutinous rice flour is an important raw material for making foods such as snow skin and pastry skin. Its fine texture and moderate stickiness make it widely used in the production of various soft and chewy desserts. In actual production, various impurities may be introduced during the harvesting, processing, transportation, or packaging of the raw materials. Therefore, before adding glutinous rice flour to food production, in addition to coarse sieving and magnetic separation to remove any large lumps of impurities and metal shavings (such as iron filings and stainless steel fragments), it is also necessary to perform finer sieving to remove any small, lightweight impurities such as hair, paper scraps, and pieces of woven fabric. Currently, the common method for fine sieving of glutinous rice flour is to evenly spread the powder on a high-mesh sieve, typically 80 to 120 mesh. Then, mechanical vibration or ultrasonic excitation is used to allow the glutinous rice flour of the correct particle size to pass through the sieve, while larger, lighter impurities are trapped on the sieve surface, thus achieving separation of impurities from the powder.

[0003] While this type of vibrating fine sieving can basically meet the process requirements in terms of sieving accuracy, it has some problems in actual continuous production. Impurities sieved through the fine screen require periodic shutdowns and manual cleaning by workers, increasing labor intensity and reducing continuous equipment operation time, severely impacting overall production efficiency. Secondly, because glutinous rice flour is highly hygroscopic, it easily becomes damp and clumps during storage or handling, forming lumps larger than the sieve mesh. During fine sieving, these usable lumps, which should be retained, are trapped on the screen along with hair, paper scraps, and other impurities due to their similar size, leading to a higher mis-sieving rate, material waste, and increased complexity of subsequent manual sorting. How to achieve fine sieving while automatically cleaning the sieved fine impurities and avoiding mis-sieving clumps of glutinous rice flour has become a technical challenge. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sieving device for finely sieving glutinous rice flour.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sieving device for finely sieving glutinous rice flour, comprising a frame, a sieving chamber on the upper side of the frame, and the lower end of the sieving chamber being connected to a powder discharge hopper.

[0006] The sieving bin is equipped with a sieving mechanism, which can be pulled out from the left side of the sieving bin. A feeding box is fixedly installed on the right side of the sieving bin. The upper side of the feeding box is connected to a feeding pipe for inputting powdery glutinous rice flour. When the sieving mechanism is installed in the sieving bin, it passes through the feeding box. A waste collection mechanism is provided below the left side of the sieving bin for collecting the sieving impurities.

[0007] The powder screening mechanism includes a side cover plate, a support frame, a central rotating shaft, and a feed end seat. The side cover plate and the feed end seat are respectively fixedly installed at both ends of the support frame. A rotatable screen cage is provided at the support frame. The central rotating shaft passes through the support frame, and its two ends are rotatably mounted on the side cover plate and the feed end seat, respectively. A rotating wheel and a powder-dispersing drum for cooperating with the feed end seat are installed at the central rotating shaft. A translation seat is slidably provided at the support frame, and the rotating wheel drives the screen cage to rotate through the translation seat.

[0008] To further elaborate, the upper and lower sides of the translation seat are respectively provided with an upper rolling pin and a lower rolling pin, the surface of the rotating wheel is provided with a spiral groove that cooperates with the lower rolling pin, the inside of the screen cage is provided with a drive wheel ring, and the inner wall of the drive wheel ring is provided with several inclined platform portions that cooperate with the upper rolling pin.

[0009] To further elaborate, the support frame is provided with a first support beam and a second support beam. The translation seat is slidably disposed on the first support beam. A dividing ring is provided between the first support beam and the second support beam. The dividing ring abuts against the dividing partition in the powder screening chamber. The first support beam is located in the powder screening chamber on the right side of the dividing partition, and the second support beam is located in the waste collection chamber on the left side of the dividing partition.

[0010] To further elaborate, the feeding end seat is provided with a boss portion, and the boss portion has a powder inlet hole that runs through the left and right sides. The left end of the feeding end seat is provided with an inner cylinder portion and an outer cylinder portion. The inner cylinder portion is located in the inner cavity of the outer cylinder portion. A powder flow channel is provided between the inner cylinder portion and the outer cylinder portion. The powder flow channel is connected to the powder inlet hole. The powder inlet hole is connected to the inner cavity of the feeding box. The feeding box is provided with a first air vent for blowing away glutinous rice powder dust.

[0011] To further elaborate, the powder rotating drum has a narrow end and a wide end, and an inclined cylinder wall is provided between the narrow end and the wide end. The narrow end is located in the inner cavity of the inner cylinder of the feed end seat.

[0012] To elaborate further, a first limiting ring is fixedly installed on the right side of the dividing ring of the support frame, and a second limiting ring is fixedly installed on the feed end seat. The first limiting ring and the second limiting ring respectively limit the two ends of the screen cage.

[0013] To further elaborate, a through pipe is provided on the left side of the dividing ring of the support frame. The left end of the through pipe is connected to the second air port of the side cover plate, and the right end of the through pipe is connected to the middle through port of the dividing ring of the support frame. The middle part of the through pipe is provided with a lower through pipe that is connected to the waste collection mechanism.

[0014] To further elaborate, the waste collection mechanism includes a waste guide pipe, a pneumatic control valve, and a waste outlet pipe. The pneumatic control valve is installed at the waste outlet pipe, and the upper end of the waste outlet pipe is connected to the lower through pipe section of the through pipe fitting.

[0015] The beneficial effects of this invention are as follows: This invention provides a removable sieving mechanism in the sieving chamber. The two sides of the sieving mechanism are connected to the feed box and the waste collection mechanism, respectively. The central rotating shaft of the sieving mechanism drives the powder drum to rotate synchronously. When the powder drum rotates, it can throw the glutinous rice powder output from the powder channel to all sides. The glutinous rice powder quickly hits the screen cage, which not only achieves sieving but also breaks up the damp and clump-like powder. This effectively solves the technical problem of powder clumps being mis-sieved. In addition, while the central rotating shaft rotates, it can also drive the translation seat through the rotating wheel. The spiral groove of the rotating wheel drives the translation seat to approach the drive wheel ring of the screen cage. The upper rolling pin of the translation seat pushes the inclined platform of the drive wheel ring, thereby causing the screen cage to deflect and causing the glutinous rice powder accumulated on the upper side of the screen cage to automatically fall into the powder discharge hopper. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention when the front cover of the powder screening chamber is in the open state.

[0018] Figure 3 This is a schematic diagram of the structure of the present invention when the powder screening mechanism is extracted from one side of the powder screening chamber.

[0019] Figure 4 This is a cross-sectional view of the internal structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the present invention when the feed box is in the open state.

[0021] Figure 6 This is a schematic diagram of the powder screening mechanism.

[0022] Figure 7 This is a partial structural cross-sectional view of the present invention during powder sieving.

[0023] Figure 8 This is a cross-sectional view of the internal structure of the screen cage according to the present invention.

[0024] Figure 9 This is a schematic diagram of the structure of the present invention when air is blown into the through pipe at the second air inlet.

[0025] Figure 10 for Figure 9 A magnified view of a portion of point A.

[0026] Figure 11 This is a schematic diagram of the support frame.

[0027] Figure 12 This is a schematic diagram of the structure of a screen cage.

[0028] Figure 13 This is a cross-sectional view of the feed end seat.

[0029] Figure 14 This is a schematic diagram of the powder rotating drum.

[0030] Icon labels:

[0031] 10. Frame; 20. Screening bin; 201. Screening chamber; 202. Waste collection chamber; 21. Dividing partition; 22. Cover plate; 221. Movable hinge; 30. Powder discharge hopper;

[0032] 40. Sieving mechanism; 41. Side cover plate; 411. Second air port; 412. Second regulating valve; 413. Handle; 42. Support frame; 421. First support beam; 422. Second support beam; 423. Dividing ring; 4231. Intermediate opening; 424. First limiting ring; 425. Second limiting ring; 43. Central shaft; 44. Feed end seat; 441. Boss; 442. Powder inlet hole; 443. 444 Inner cylinder section; 445 Outer cylinder section; 445 Powder conveying channel; 45 Screen cage; 451 Drive wheel ring; 452 Inclined platform section; 46 Rotary wheel component; 461 Spiral channel; 47 Powder dispersing drum; 471 Narrow end; 472 Wide end; 473 Inclined cylinder wall; 474 Inner connecting frame section; 48 Translation seat; 481 Upper rolling pin; 482 Lower rolling pin; 49 Through pipe fitting; 491 Lower through pipe section;

[0033] 50. Feed box; 501. First air port; 502. First regulating valve; 51. Feed pipe; 60. Waste collection mechanism; 61. Waste guide pipe; 62. Pneumatic control valve; 63. Waste outlet pipe; 70. Drive motor; 80. Bearing end cover. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Combined with appendix Figure 1 and attached Figure 2 As shown, a sieving device for finely sieving glutinous rice flour includes a frame 10, a sieving chamber 20 on the upper side of the frame 10, and a sieving chamber 20 connected at its lower end to a powder discharge hopper 30. The sieving chamber 20 is specifically provided with an openable front cover 22, and a movable hinge 221 connects the front cover 22 and the sieving chamber 20. The front cover 22 can be opened from the sieving chamber 20, and the situation inside the sieving chamber 20 can be observed by opening the front cover 22.

[0036] Combined with appendix Figure 1 and attached Figure 3 As shown, a sieving mechanism 40 is provided at the sieving bin 20. The sieving mechanism 40 can be pulled out from the left end of the sieving bin 20. A feed box 50 is fixedly provided at the right end of the sieving bin 20. The upper side of the feed box 50 is connected to a feed pipe 51 for feeding powdery glutinous rice flour. When the sieving mechanism 40 is installed at the sieving bin 20, the sieving mechanism 40 passes through the feed box 50. A waste collection mechanism 60 is provided below the left end of the sieving bin 20. The waste collection mechanism 60 is used to collect the impurities screened out.

[0037] Combined with appendix Figure 3 Appendix Figure 6 and attached Figure 7 As shown, the powder screening mechanism 40 includes a side cover plate 41, a support frame 42, a central rotating shaft 43, and a feed end seat 44. The side cover plate 41 and the feed end seat 44 are respectively fixedly installed at both ends of the support frame 42. The right side of the powder screening chamber 20 is specifically provided with a drive motor 70 for driving the central rotating shaft 43 to rotate. The drive motor 70 drives the central rotating shaft 43 to rotate through a synchronous pulley set (Note: not shown in the attached figure). The support frame 42 is provided with a movable and rotatable screen cage 45. The screen size of the screen cage 45 is a conventional 100 mesh. The central rotating shaft 43 passes through the support frame 42, and the two ends of the central rotating shaft 43 are respectively rotatably set on the side cover plate 41 and the feed end seat 44. Both the side cover plate 41 and the feed end seat 44 are provided with bearing end caps 80. The bearing end caps 80 are specifically provided with sealed bearings that are rotatably connected to the central rotating shaft 43. A handle 413 is provided at the side cover plate 41. By grasping the handle 413, the powder screening mechanism 40 can be pulled out from the left end of the powder screening chamber 20.

[0038] Combined with appendix Figure 4 and attached Figure 8As shown, the support frame 42 is provided with a first support beam 421 and a second support beam 422. The translation seat 48 is slidably disposed on the first support beam 421. A dividing ring 423 is provided between the first support beam 421 and the second support beam 422. The dividing ring 423 abuts against the dividing partition 21 in the powder screening chamber 20. The first support beam 421 is located in the powder screening chamber 201 on the right side of the dividing partition 21, and the second support beam 422 is located in the waste collection chamber 202 on the left side of the dividing partition 21.

[0039] Combined with appendix Figure 7 and attached Figure 8 As shown, a rotating wheel 46 and a powder rotating drum 47 for cooperating with the feed end seat 44 are installed at the central rotating shaft 43. A translation seat 48 is slidably provided at the support frame 42. The two sides of the translation seat 48 are respectively straddled at the first support beam 421 of the support frame 42. The rotating wheel 46 drives the screen cage 45 to rotate through the translation seat 48.

[0040] Combined with appendix Figure 7 and attached Figure 13 As shown, the feed end seat 44 has a boss portion 441, and the boss portion 441 has a powder inlet hole 442 that passes through the left and right sides. The left side end of the feed end seat 44 has an inner cylinder portion 443 and an outer cylinder portion 444. The inner cylinder portion 443 is located in the inner cavity of the outer cylinder portion 444. A powder flow channel 445 is provided between the inner cylinder portion 443 and the outer cylinder portion 444. The powder flow channel 445 is connected to the powder inlet hole 442. Figure 5 As shown, the powder inlet 442 is connected to the inner cavity of the feed box 50. The feed box 50 is provided with a first air inlet 501 for blowing away glutinous rice powder dust. Specifically, a first regulating valve 502 with an air pipe connector is installed at the first air inlet 501. The first regulating valve 502 is connected to an air supply pipe (note: not shown in the attached figure) for blowing air into the first air inlet 501. (See attached figure) Figure 7 As shown, the feed pipe 51 feeds powdered glutinous rice flour into the feed box 50, which is filled with glutinous rice dust. The first air port 501 blows the glutinous rice dust in the feed box 50 into the powder inlet hole 442 of the material end seat 44. The glutinous rice dust enters the powder conveying channel 445 from the powder inlet hole 442. Since the rear end of the powder conveying channel 445 is narrowed, the flow rate of the glutinous rice dust output from the powder conveying channel 445 is faster.

[0041] Combined with appendix Figure 7 and attached Figure 14As shown, the loose powder rotating drum 47 has a narrow end 471 and a wide end 472. An inclined cylinder wall 473 is provided between the narrow end 471 and the wide end 472. The narrow end 471 is located in the inner cavity of the inner cylinder part 443 of the feed end seat 44. The inner cavity of the loose powder rotating drum 47 is specifically provided with an inner connecting frame part 474 that is fixedly connected to the central rotating shaft 43. The central rotating shaft 43 drives the loose powder rotating drum 47 to rotate synchronously. When the loose powder rotating drum 47 rotates, it can throw the glutinous rice powder output from the powder passage 445 to all sides. The glutinous rice powder quickly hits the screen cage 45, which not only achieves sieving of powder, but also breaks up the damp and clump-like powder, effectively solving the technical problem of powder clumps being mis-sieved.

[0042] Because the rotating powder drum 47 throws glutinous rice flour dust in all directions, glutinous rice flour tends to accumulate on the upper side of the sieve cage 45 over a long period. To ensure that the accumulated glutinous rice flour falls into the discharge hopper 30, the sieve cage 45 needs a rotatable design. However, since the sieving mechanism 40 is located within the sealed sieving chamber 20 during sieving operations, and the central rotating shaft 43 is separated from the sieve cage 45 by the support frame 42, the central rotating shaft 43 cannot directly drive the sieve cage 45 to rotate. How to achieve self-rotation of the sieve cage 45 within the sealed sieving chamber 20 has become a difficult technical problem to solve.

[0043] Therefore, this invention employs a rotating wheel 46 to drive a translation seat 48, combined with a special structural design of the screen cage 45. (See attached diagram for details.) Figure 8 Appendix Figure 9 and attached Figure 12 As shown, the upper and lower sides of the translation seat 48 are respectively provided with an upper rolling pin 481 and a lower rolling pin 482. The surface of the rotating wheel 46 is provided with a spiral groove 461 that cooperates with the lower rolling pin 482. The inside of the screen cage 45 is provided with a drive wheel ring 451. The inner wall of the drive wheel ring 451 is provided with several inclined platform portions 452 that cooperate with the upper rolling pin 481.

[0044] When the central rotating shaft 43 drives the rotating wheel 46 to rotate synchronously in the forward direction, the spiral groove 461 of the rotating wheel 46 drives the translation seat 48 to approach the drive wheel ring 451 of the screen cage 45. The upper rolling pin 481 of the translation seat 48 pushes the inclined platform 452 of the drive wheel ring 451, thereby causing the screen cage 45 to deflect. The deflection of the screen cage 45 causes the glutinous rice flour accumulated on its upper side to fall into the powder discharge hopper 30. Subsequently, the central rotating shaft 43 drives the rotating wheel 46 to rotate in the reverse direction. The spiral groove 461 of the rotating wheel 46 drives the translation seat 48 away from the drive wheel ring 451 of the screen cage 45, so that the translation seat 48 returns to its original position. This cycle repeats continuously. Furthermore, regardless of whether the central rotating shaft 43 rotates in the forward or reverse direction, the powder dispersing drum 47 can throw the glutinous rice flour dust output from the powder passage 445 to all sides, so that the screen cage 45 can rotate on its own within the sealed powder sieving chamber 20 while sieving the powder.

[0045] In addition, combined with the appendix Figure 8 To be continued Figure 10 As shown, a first limiting ring 424 is fixedly installed on the right side of the dividing ring 423 of the support frame 42, and a second limiting ring 425 is fixedly installed on the feed end seat 44. The first limiting ring 424 and the second limiting ring 425 respectively limit the two ends of the screen cage 45, so that the screen cage 45 can rotate in place relative to the support frame 42.

[0046] Combined with appendix Figure 4 and attached Figure 9 As shown, a through pipe 49 is provided on the left side of the dividing ring 423 of the support frame 42. The left end of the through pipe 49 is connected to the second air port 411 of the side cover plate 41, and the right end of the through pipe 49 is connected to the middle through port 4231 of the dividing ring 423 of the support frame 42. A lower through pipe 491 connected to the waste collection mechanism 60 is provided in the middle of the through pipe 49. (See attached diagram) Figure 7 and attached Figure 9 As shown, a second regulating valve 412 with an air pipe connector is specifically installed at the second air port 411. The structure of the second regulating valve 412 is the same as that of the first regulating valve 502. The second regulating valve 412 is connected to an air pipe (Note: not shown in the attached figure).

[0047] Combined with appendix Figure 1 and attached Figure 3 As shown, the waste collection mechanism 60 includes a waste guide pipe 61, a pneumatic control valve 62, and a waste discharge pipe 63. The pneumatic control valve 62 is installed at the waste discharge pipe 63, and the upper end of the waste discharge pipe 63 is connected to the lower through pipe section 491 of the through pipe fitting 49. In actual use, a waste collection bag (not shown in the attached drawing) is tied to the lower end of the waste discharge pipe 63 for easy replacement.

[0048] To prevent glutinous rice flour dust from accidentally entering the waste collection bag during sifting, the pneumatic control valve 62 is in the closed position at this time, and as shown in the attached... Figure 9 As shown, the second air inlet 411 blows air into the through pipe 49, increasing the air pressure inside the through pipe 49. The glutinous rice flour that accidentally enters the through pipe 49 is blown back into the sieve cage 45.

[0049] This invention, when performing powder sieving operations, combines with attached... Figure 7As shown, the feed pipe 51 feeds powdered glutinous rice flour into the feed box 50, filling the feed box 50 with glutinous rice flour. The first air port 501 blows the glutinous rice flour from the feed box 50 into the powder inlet 442 of the material end seat 44. The glutinous rice flour enters the powder conveying channel 445 from the powder inlet 442. The central rotating shaft 43 drives the powder dispersing drum 47 to rotate synchronously. When the powder dispersing drum 47 rotates, it can throw the glutinous rice flour output from the powder conveying channel 445 to all sides. The glutinous rice flour quickly hits the screen cage 45, which not only sifts the flour but also breaks up the damp and clump-like powder. The glutinous rice flour sifted by the screen cage 45 falls into the powder outlet hopper 30. In addition, the central rotating shaft 43 drives the rotating wheel 46 to rotate. The rotating wheel 46 drives the screen cage 45 to deflect through the translation seat 48, so that the glutinous rice flour accumulated on the upper side of the screen cage 45 can also fall into the powder outlet hopper 30. At the same time, the second air inlet 411 blows air into the through pipe 49, increasing the air pressure inside the through pipe 49, and the glutinous rice flour that has accidentally entered the through pipe 49 is blown back into the sieve cage 45.

[0050] During waste discharge operations, the central shaft 43 stops rotating after completing the sieving process. After sieving, the screen cage 45 will retain small, lightweight impurities such as hair, paper scraps, and woven fabric fragments. The pneumatic control valve 62 of the waste collection mechanism 60 opens, and the first air port 501 blows air to blow the small, lightweight impurities in the screen cage 45 into the through pipe 49, from which they fall into the waste collection bag. Then, the pneumatic control valve 62 closes again.

[0051] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] It should be understood that the terms "first," "second," etc., are used in this invention to describe various types of information, but these terms are not limited to them; they are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0053] The above description is not intended to limit the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A powder screening device for fine screening of glutinous rice powder, comprising a frame (10), the upper side of the frame (10) is provided with a powder screening bin (20), the lower end of the powder screening bin (20) is connected with a powder discharge hopper (30), characterized in that: a powder screening mechanism (40) is arranged at the powder screening bin (20), the powder screening mechanism (40) can be extracted from the left end of the powder screening bin (20), a feeding box (50) is fixedly arranged at the right end of the powder screening bin (20), the upper side of the feeding box (50) is connected with a feeding pipe (51) for feeding powder dust glutinous rice, when the powder screening mechanism (40) is installed at the powder screening bin (20), the powder screening mechanism (40) is arranged in the feeding box (50), a waste collecting mechanism (60) is arranged below the left end of the powder screening bin (20), the waste collecting mechanism (60) is used for collecting impurities screened out; the powder screening mechanism (40) comprises a side cover plate (41), a support frame (42), a transfer shaft (43) and a feeding end seat (44), the side cover plate (41) and the feeding end seat (44) are respectively fixedly arranged at the two ends of the support frame (42), a movable rotating screen cage (45) is arranged at the support frame (42), the transfer shaft (43) penetrates through the support frame (42), and the two ends of the transfer shaft (43) are respectively rotatably arranged at the side cover plate (41) and the feeding end seat (44), a rotating wheel (46) and a powder scattering rotary drum (47) used for cooperating with the feeding end seat (44) are arranged at the transfer shaft (43), a translation seat (48) is slidably arranged at the support frame (42), the rotating wheel (46) drives the screen cage (45) to rotate through the translation seat (48); upper and lower sides of the translation seat (48) are respectively provided with upper and lower rolling pins (481, 482), the surface of the rotating wheel (46) is provided with a spiral groove (461) matched with the lower rolling pin (482), the inside of the screen cage (45) is provided with a driving wheel ring (451), and the inner wall of the driving wheel ring (451) is provided with a plurality of inclined table portions (452) matched with the upper rolling pin (481).

2. The powder screening device for fine screening of glutinous rice powder according to claim 1, characterized in that: the support frame (42) is provided with a first support beam portion (421) and a second support beam portion (422), the translation seat (48) is slidably arranged at the first support beam portion (421), a boundary ring portion (423) is arranged between the first support beam portion (421) and the second support beam portion (422), the boundary ring portion (423) abuts against a boundary partition plate (21) in the powder screening bin (20), the first support beam portion (421) is located in a powder screening cavity (201) on the right side of the boundary partition plate (21), and the second support beam portion (422) is located in a waste collecting cavity (202) on the left side of the boundary partition plate (21).

3. The powder screening device for fine screening of glutinous rice powder according to claim 1, characterized in that: The inlet end seat (44) is provided with a boss part (441) which is provided with a powder inlet hole (442) penetrating through the left and right sides, the left end of the inlet end seat (44) is provided with an inner cylinder part (443) and an outer cylinder part (444), the inner cylinder part (443) is arranged in the inner cavity of the outer cylinder part (444), a powder passing channel (445) is arranged between the inner cylinder part (443) and the outer cylinder part (444), the powder passing channel (445) is connected with the powder inlet hole (442), the powder inlet hole (442) is connected with the inner cavity of the inlet box (50), the inlet box (50) is provided with a first air port (501) for blowing glutinous rice powder dust.

4. The powder screening device for fine screening of glutinous rice powder according to claim 3, characterized in that: The powder scattering drum (47) is provided with a narrow end (471) and a wide end (472), an inclined drum wall (473) is arranged between the narrow end (471) and the wide end (472), and the narrow end (471) is located at the inner cavity of the inner cylinder part (443) of the inlet end seat (44).

5. The powder sieving device for fine sieving of glutinous rice powder according to claim 1, characterized in that: The right side of the boundary ring part (423) of the support frame (42) is fixedly provided with a first limiting ring (424), the inlet end seat (44) is fixedly provided with a second limiting ring (425), and the first limiting ring (424) and the second limiting ring (425) limit the two ends of the screen mesh cage (45) respectively.

6. The flour screening device for fine screening of glutinous rice flour according to claim 5, characterized in that: The left side of the boundary ring part (423) of the support frame (42) is provided with a through pipe part (49), the left end of the through pipe part (49) is connected with the second air port (411) of the side cover plate (41), the right end of the through pipe part (49) is connected with the middle through port (4231) of the boundary ring part (423) of the support frame (42), and the middle part of the through pipe part (49) is provided with a lower through pipe part (491) which is connected with the waste collecting mechanism (60).

7. The flour screening device for fine screening of glutinous rice flour according to claim 6, characterized in that: The waste collecting mechanism (60) comprises a waste guide pipe (61), a pneumatic control valve (62) and a waste outlet pipe (63), the pneumatic control valve (62) is arranged at the waste outlet pipe (63), and the upper end of the waste outlet pipe (63) is connected with the lower through pipe part (491) of the through pipe part (49).

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