A kind of pulverizing and screening device for processing Rhus succedanea

Abstract

This invention belongs to the field of crushing and grinding technology, specifically referring to a crushing and screening device for processing tofu wood. It includes a spiral grinding assembly, a grinding drive mechanism, a reflux feeding mechanism, and a cylinder. The grinding drive mechanism includes a lifting support assembly and a rotating drive assembly, both housed within the cylinder. This invention proposes a spiral grinding assembly that, through the relative rotation of two spiral grinding bars with the same pitch, can propel the material while grinding. Simultaneously, the compression and rebound of the pressure spring maintains sufficient pressure between the lifting and rotating grinding discs, and allows for avoidance of interference between the first and second spiral grinding bars through the descent of the lifting grinding disc.

Description

Technical Field

[0001] This invention belongs to the field of crushing and grinding technology, specifically referring to a crushing and screening device for processing tofu wood. Background Technology

[0002] Tofu shrub is a deciduous shrub with medicinal and edible value. Currently, its roots or leaves are mostly processed into powder for later addition to food or medicine. Before powdering, it needs to be air-dried to remove some moisture. However, current powdering equipment still needs to solve two problems:

[0003] First: The movement of powder in a traditional grinding disc is not very controllable. Generally, it will only move in all directions under the action of centrifugal force when the rotation speed is relatively fast. If the joint between the two discs is designed to be inclined, then because the material falls for a constant time, the grinding time is prone to be insufficient when the grinding speed changes.

[0004] Second: Although the grinding disc has high grinding efficiency, it is difficult to guarantee the particle size of the final product. Therefore, it is necessary to screen the material after grinding and grind the insufficiently ground material again. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a crushing and screening device for processing tofu wood. In order to achieve the technical effect of pushing the material to move outward during the grinding process, the present invention proposes a spiral grinding component. Through the relative rotation of two spiral grinding bars with the same pitch, the material can be pushed to move while grinding. At the same time, by utilizing the compression and rebound of the compression spring, sufficient squeezing force can be maintained between the lifting grinding disc and the rotating grinding disc. Furthermore, when the first spiral grinding bar and the second spiral grinding bar interfere with each other, the lowering of the lifting grinding disc can avoid the interference.

[0006] Furthermore, the external reflux feeding mechanism not only allows for the recycling and secondary grinding of insufficiently ground materials, but also simultaneously drives the automatic feeding component to feed materials slowly and continuously, ensuring the continuity of the crushing and grinding process.

[0007] The technical solution adopted by the present invention is as follows: The present invention proposes a crushing and screening device for processing tofu wood, including a spiral grinding assembly, a grinding drive mechanism, a reflux feeding mechanism and a cylinder. The grinding drive mechanism includes a lifting support assembly and a rotating drive assembly, which are disposed in the cylinder. The spiral grinding assembly includes a lifting grinding disc and a rotating grinding disc. The lifting grinding disc is slidably disposed on the lifting support assembly, and the rotating grinding disc is rotatably disposed in the reflux feeding mechanism.

[0008] The lifting grinding disc is provided with a spiral grinding strip one, and the rotating grinding disc is provided with a spiral grinding strip two. Both spiral grinding strip one and spiral grinding strip two are in the form of planar vortex lines, with equal pitch and matching cross-sectional profiles.

[0009] When spiral grinding strip one and spiral grinding strip two are offset from a top-down perspective, the sliding of spiral grinding strip two on the lifting grinding disc can grind the material on the one hand, and push the material outward on the other hand, so that the material can eventually fall off the edge of the lifting grinding disc. When spiral grinding strip one and spiral grinding strip two overlap from a top-down perspective, the lifting grinding disc will avoid interference between spiral grinding strip one and spiral grinding strip two by its own descent. At this time, a spiral channel is formed between the lifting grinding disc and the rotating grinding disc. When the airflow flows in the channel, it can push the material outward along the spiral channel. The airflow can supplement the pushing of spiral grinding strip two, and together they can achieve unidirectional movement of the material.

[0010] Furthermore, the lifting support assembly includes a grinding bracket, a compression spring, and a sliding block. The grinding bracket is fixedly connected to the inside of the cylinder and has a guide column. The lifting grinding plate has an arc-shaped cavity. The sliding block is fixedly connected to the arc-shaped cavity and is engaged and slidably mounted on the guide column. The compression spring is located between the grinding bracket and the sliding block.

[0011] The compression spring enables the lifting grinding disc and the rotating grinding disc to exert a squeezing force. At the same time, when the first spiral grinding strip and the second spiral grinding strip overlap from a top-down perspective, the compression spring can also allow the lifting grinding disc to descend, thus preventing interference between the first spiral grinding strip and the second spiral grinding strip.

[0012] Preferably, the rotary drive assembly includes a motor bracket, a drive motor, a drive gear, and a driven gear ring. The motor bracket is fixed to the inner wall of the cylinder, and the drive motor is mounted on the motor bracket.

[0013] As a further preferred embodiment of the present invention, the drive gear is fixedly connected to the output shaft of the drive motor, and the driven gear ring is fixedly connected to the rotating grinding disc. The drive gear and the driven gear ring mesh and drive each other. When the first spiral grinding strip and the second spiral grinding strip press against each other, the lifting grinding disc will compress the clamping spring and descend.

[0014] Furthermore, the reflux feeding mechanism includes a reflux component and an automatic feeding component. The reflux component is located outside the cylinder, and the automatic feeding component is located at the top of the cylinder.

[0015] Preferably, the reflux assembly includes a reflux channel, a reflux fan, and a reflux valve. The reflux fan is located inside the reflux channel, the reflux valve is located at the end of the reflux channel, the reflux valve has an exhaust port, and the reflux valve has a flow-dividing screen plate arranged inside its interior.

[0016] The return channel is driven by the return fan to generate airflow. This airflow can transport the insufficiently ground material back to the return valve, so that it can re-enter the spiral grinding assembly.

[0017] As a further preferred embodiment of the present invention, the automatic feeding assembly includes a cryogenic storage chamber and a wheeled feeding baffle. The cryogenic storage chamber is located above the reflux valve and has a feeding port that extends into the reflux valve. The wheeled feeding baffle is rotatably positioned in the feeding port, and the airflow passing through the diversion screen plate can drive the wheeled feeding baffle to rotate.

[0018] The diversion screen plate can isolate insufficiently ground materials and allow them to enter the straight cylinder section. On the other hand, it can also divert the gas in the return channel. Part of the gas enters downward between the lifting grinding disc and the rotating grinding disc, while the other part of the gas pushes the wheel-type discharge baffle laterally and then exits from the exhaust port.

[0019] The low-temperature storage chamber can cool uncrushed materials, reducing their toughness and increasing their brittleness, making them easier to turn into powder during subsequent crushing and grinding processes.

[0020] As a further preferred embodiment of the present invention, the rotating grinding disc is provided with a straight cylindrical section, which is rotatably disposed in the reflux valve. The inside of the straight cylindrical section is also provided with a crushing blade. When the crushing blade rotates with the rotating grinding disc, it can perform preliminary cutting and crushing of the material falling from the low-temperature storage chamber.

[0021] Furthermore, a screening hopper is provided in the middle of the cylinder, an inclined screening plate is provided below the screening hopper, and a collection box is provided below the screening plate.

[0022] Preferably, a transverse through chamber extending into the cylinder is provided on one side of the reflux channel, and an extension is provided on the screening plate. The extension is located in the transverse through chamber and the reflux channel, and an inclined baffle is provided on the transverse through chamber.

[0023] The beneficial effects achieved by the present invention using the above structure are as follows:

[0024] (1) When the spiral grinding strip 1 and spiral grinding strip 2 are misaligned in the top view, the sliding of spiral grinding strip 2 on the lifting grinding plate can grind the material on the one hand, and push the material to move outward on the other hand; when spiral grinding strip 1 and spiral grinding strip 2 overlap in the top view, the lifting grinding plate will avoid interference between spiral grinding strip 1 and spiral grinding strip 2 by its own descent.

[0025] (2) When the airflow flows in the channel, it can push the material outward along the spiral channel. The airflow can supplement the pushing of the spiral grinding strip II, and together realize the unidirectional movement of the material.

[0026] (3) The compression spring can provide a squeezing force between the lifting grinding disc and the rotating grinding disc. At the same time, when the first spiral grinding strip and the second spiral grinding strip overlap in the top view, the compression spring can also allow the lifting grinding disc to descend, thus avoiding interference between the first spiral grinding strip and the second spiral grinding strip.

[0027] (4) An airflow is generated inside the return channel under the drive of the return fan. This airflow can transport the insufficiently ground material back to the return valve, so that it can re-enter the spiral grinding assembly.

[0028] (5) The diversion screen plate can isolate the material that is not sufficiently ground and let it enter the straight cylinder. On the other hand, it can also divert the gas in the return channel. Part of the gas enters downward between the lifting grinding disc and the rotating grinding disc, and the other part of the gas pushes the wheel-type feeding baffle laterally and then exits from the exhaust port.

[0029] (6) The low-temperature storage chamber can cool down the uncrushed material, reduce the toughness of the material and increase its brittleness, making it easier to turn into powder in the subsequent crushing and grinding process. Attached Figure Description

[0030] Figure 1 This is a perspective view of a crushing and screening device for processing tofu shreds according to the present invention;

[0031] Figure 2 This is a front view of a crushing and screening device for processing tofu wood according to the present invention;

[0032] Figure 3 for Figure 2 A cross-sectional view along the cutting line AA;

[0033] Figure 4 for Figure 3 A cross-sectional view along the cutting line BB;

[0034] Figure 5 This is a half-sectional schematic diagram of a crushing and screening device for processing tofu wood according to the present invention.

[0035] Figure 6 This is an exploded structural diagram of a crushing and screening device for processing tofu wood according to the present invention;

[0036] Figure 7 for Figure 5 A magnified view of a section at point I;

[0037] Figure 8 for Figure 3 Enlarged view of a section at point II;

[0038] Figure 9 This is a schematic diagram showing the longitudinal projection positions of spiral grinding strip one and spiral grinding strip two;

[0039] Figure 10 This is a schematic diagram of the rotational motion of the spiral grinding assembly.

[0040] The components include: 1. Spiral grinding assembly; 2. Grinding drive mechanism; 3. Recirculating feeding mechanism; 4. Cylinder; 5. Lifting grinding disc; 6. Rotating grinding disc; 7. Spiral grinding strip one; 8. Arc-top cavity; 9. Spiral grinding strip two; 10. Straight cylinder; 11. Lifting support assembly; 12. Rotating drive assembly; 13. Grinding bracket; 14. Compression spring; 15. Sliding block; 16. Motor bracket; 17. Drive motor; 18. Drive gear. 19. Driven gear ring, 20. Guide column, 21. Reflux assembly, 22. Automatic feeding assembly, 23. Reflux channel, 24. Reflux fan, 25. Reflux valve, 26. Low temperature storage chamber, 27. Wheel-type feeding baffle, 28. Horizontal through chamber, 29. Inclined baffle, 30. Exhaust port, 31. Diverting screen plate, 32. Feed port, 33. Screening hopper, 34. Screening plate, 35. Extension section, 36. Collection box, 37. Crushing blade.

[0041] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] 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.

[0044] like Figures 1-8 As shown, the present invention proposes a crushing and screening device for processing tofu wood, including a spiral grinding assembly 1, a grinding drive mechanism 2, a reflux feeding mechanism 3 and a cylinder 4. The grinding drive mechanism 2 includes a lifting support assembly 11 and a rotating drive assembly 12, which are disposed in the cylinder 4. The spiral grinding assembly 1 includes a lifting grinding disc 5 and a rotating grinding disc 6. The lifting grinding disc 5 is slidably disposed on the lifting support assembly 11, and the rotating grinding disc 6 is rotatably disposed in the reflux feeding mechanism 3.

[0045] The lifting grinding disc 5 is provided with a spiral grinding strip 7, and the rotating grinding disc 6 is provided with a spiral grinding strip 9. Both the spiral grinding strip 7 and the spiral grinding strip 9 are in the form of planar vortex lines, with equal pitch and matching cross-sectional profiles.

[0046] When the spiral grinding strip 7 and the spiral grinding strip 9 are misaligned from a top-down perspective, the sliding of the spiral grinding strip 9 on the lifting grinding disc 5 can grind the material on one hand, and push the material outward on the other hand, so that the material can eventually fall off the edge of the lifting grinding disc 5. When the spiral grinding strip 7 and the spiral grinding strip 9 overlap from a top-down perspective, the lifting grinding disc 5 will avoid interference between the spiral grinding strip 7 and the spiral grinding strip 9 by its own descent. At this time, a spiral channel is formed between the lifting grinding disc 5 and the rotating grinding disc 6. When the airflow flows in the channel, it can push the material outward along the spiral channel. The airflow can supplement the pushing of the spiral grinding strip 9, and together they can achieve unidirectional movement of the material.

[0047] The lifting support assembly 11 includes a grinding bracket 13, a compression spring 14, and a sliding block 15. The grinding bracket 13 is fixed to the inside of the cylinder 4. A guide post 20 is provided on the grinding bracket 13. An arc-shaped cavity 8 is provided on the lifting grinding disc 5. The sliding block 15 is fixed to the arc-shaped cavity 8 and is engaged and slidably disposed on the guide post 20. The compression spring 14 is disposed between the grinding bracket 13 and the sliding block 15.

[0048] The compression spring 14 enables the lifting grinding disc 5 and the rotating grinding disc 6 to exert a squeezing force. At the same time, when the spiral grinding strip 1 7 and the spiral grinding strip 2 9 overlap in the top view, the compression spring 14 can also allow the lifting grinding disc 5 to descend, thus preventing the spiral grinding strip 1 7 and the spiral grinding strip 2 9 from interfering with each other.

[0049] The rotary drive assembly 12 includes a motor bracket 16, a drive motor 17, a drive gear 18, and a driven gear ring 19. The motor bracket 16 is fixed to the inner wall of the cylinder 4, and the drive motor 17 is mounted on the motor bracket 16.

[0050] The drive gear 18 is fixed to the output shaft of the drive motor 17, and the driven gear ring 19 is fixed to the rotating grinding disc 6. The drive gear 18 and the driven gear ring 19 mesh and transmit power. When the spiral grinding strip 1 7 and the spiral grinding strip 2 9 press against each other, the lifting grinding disc 5 will compress the clamping spring 14 and descend.

[0051] The reflux feeding mechanism 3 includes a reflux component 21 and an automatic feeding component 22. The reflux component 21 is located outside the cylinder 4, and the automatic feeding component 22 is located at the top of the cylinder 4.

[0052] The reflux assembly 21 includes a reflux channel 23, a reflux fan 24, and a reflux valve 25. The reflux fan 24 is located inside the reflux channel 23, and the reflux valve 25 is located at the end of the reflux channel 23. The reflux valve 25 is provided with an exhaust port 30, and the reflux valve 25 is provided with a flow divider sieve plate 31 arranged inside.

[0053] The interior of the return channel 23 will generate airflow under the drive of the return fan 24. This airflow can transport the insufficiently ground material back to the return valve 25, so that it can re-enter the interior of the spiral grinding assembly 1.

[0054] The automatic feeding assembly 22 includes a cryogenic storage chamber 26 and a wheeled feeding baffle 27. The cryogenic storage chamber 26 is located above the reflux valve 25. The cryogenic storage chamber 26 is provided with a feeding port 32, which extends into the reflux valve 25. The wheeled feeding baffle 27 is rotatably located in the feeding port 32. The airflow passing through the diversion screen plate 31 can drive the wheeled feeding baffle 27 to rotate.

[0055] The diversion screen plate 31 can isolate the insufficiently ground material and allow it to enter the straight cylinder section 10. On the other hand, it can also divert the gas in the return channel 23. Part of the gas enters downward between the lifting grinding disc 5 and the rotating grinding disc 6, while the other part of the gas pushes the wheel-type feeding baffle 27 laterally and then is discharged from the exhaust port 30.

[0056] The low-temperature storage chamber 26 can cool down uncrushed materials, reduce their toughness and increase their brittleness, making them easier to turn into powder during subsequent crushing and grinding processes.

[0057] The rotating grinding disc 6 is provided with a straight cylindrical part 10, which is rotatably disposed in the reflux valve 25. The inside of the straight cylindrical part 10 is also provided with a crushing blade 37. When the crushing blade 37 rotates with the rotating grinding disc 6, it can perform preliminary cutting and crushing of the material falling in the low temperature storage chamber 26.

[0058] A screening hopper 33 is provided in the middle of the cylinder 4, and an inclined screening plate 34 is provided below the screening hopper 33. A collection box 36 is provided below the screening plate 34.

[0059] A horizontally oriented through chamber 28 extending into the cylinder 4 is provided on one side of the return channel 23. An extension 35 is provided on the screening plate 34. The extension 35 is located in the horizontally oriented through chamber 28 and the return channel 23. An inclined baffle 29 is provided on the horizontally oriented through chamber 28.

[0060] like Figure 3 As shown in the figure, the dashed arrows indicate the direction of gas and material movement. After falling from the feed port 32, the material enters the straight cylinder 10 and is initially crushed by the crushing blade 37. Then, the crushed material and gas enter the space between the lifting grinding disc 5 and the rotating grinding disc 6, and gradually move outward during the grinding process. The ground material falls onto the screening plate 34 through the screening hopper 33. The fully ground powder passes through the screening plate 34 and enters the collection box 36. The material that is not fully ground enters the return channel 23 through the extension 35 and is driven by the airflow in the return channel 23 into the return valve 25. After impacting the diversion screen plate 31, it re-enters the straight cylinder 10. Some of the airflow passes through the diversion screen plate 31 and drives the wheel-type feed baffle 27 to rotate, and then is discharged through the exhaust port 30.

[0061] like Figure 9 As shown in the figure, the filled spiral part is spiral grinding strip 7, and the part represented by the dashed line is spiral grinding strip 9. Both spiral grinding strip 7 and spiral grinding strip 9 are in the form of planar spiral lines, and their pitches are equal and their cross-sectional profiles match each other.

[0062] like Figure 10 As shown, the motion process of any small segment of the spiral grinding strip 9 is analyzed. The position of the end of this segment when it contacts the outer side of the spiral grinding strip 7 is point a, and the position when it contacts the inner side of the spiral grinding strip 7 is point b. The lines drawn from the center point of the spiral grinding assembly 1 toward points a and b can divide the entire circumference into two sector regions (the angles of the two regions are not necessarily equal), namely A and B. The dotted circle is a perfect circle with the same center as the spiral grinding assembly 1, and the arrow indicates the rotation direction of the rotating grinding disk 6.

[0063] When the endpoint is in area A, the spiral grinding strip 7 and the spiral grinding strip 9 are staggered in the top view. The sliding of the spiral grinding strip 9 on the lifting grinding disc 5 can grind the material on the one hand, and push the material to move outward on the other hand, so that the material can eventually fall from the edge of the lifting grinding disc 5.

[0064] When the endpoint is in region B, the spiral grinding strip 7 and the spiral grinding strip 9 overlap in the top view. The lifting grinding disc 5 will avoid interference between the spiral grinding strip 7 and the spiral grinding strip 9 by its own descent. At this time, a spiral channel is formed between the lifting grinding disc 5 and the rotating grinding disc 6. When the airflow flows in the channel, it can push the material to move outward along the spiral channel. The airflow can supplement the pushing of the spiral grinding strip 9, and together realize the unidirectional movement of the material.

[0065] The two processes described above are performed alternately.

[0066] In practical use, the user first needs to put the air-dried leaves of the tofu tree into the low-temperature storage chamber 26. By lowering the temperature, the toughness of the material is reduced and its brittleness is increased, making it easier to turn into powder in the subsequent crushing and grinding process. The material can be put into the low-temperature storage chamber 26 all at once, or it can be added in stages.

[0067] Then start the equipment. The return fan 24 will generate a unidirectional airflow in the return channel 23. After the airflow enters the return valve 25, part of it will pass through the diversion screen plate 31 and push the wheel-type discharge baffle 27 to rotate, and then be discharged through the exhaust port 30. The other part will be blocked by the diversion screen plate 31 and will enter downward between the lifting grinding disc 5 and the rotating grinding disc 6.

[0068] When the wheel-type feeding baffle 27 rotates, the material will slowly and continuously descend and enter the straight cylinder 10. Since the rotating grinding disc 6 rotates continuously under the drive of the rotating drive assembly 12, the crushing blade 37 can perform preliminary crushing of the material through its own rotation. The material after preliminary crushing enters the lifting grinding disc 5 and the rotating grinding disc 6, and is ground into powder under the pressure of the spiral grinding strip 7 and the spiral grinding strip 9. The specific steps are as follows:

[0069] When the lifting grinding disc 5 just rises, the spiral grinding strip 2 9 is attached to the outer side of the spiral grinding strip 1 7, which is the inner side of the spiral channel of the lifting grinding disc 5. Then, as the rotating grinding disc 6 rotates, the spiral grinding strip 2 9 will gradually approach the outer side of the spiral channel. During this process, the material inside the spiral channel can be ground. While grinding, the material will also be pushed outward. Some material will roll over the spiral grinding strip 1 7 and enter the outer circle during this process.

[0070] After the airflow enters the return valve 25, another part of the gas will flow downward under the obstruction of the diversion screen plate 31 and enter between the lifting grinding disc 5 and the rotating grinding disc 6, and continuously push the material outward.

[0071] The movement of materials mainly depends on the propulsion of the spiral grinding strip 29. The propulsion of airflow has a large effective range but low propulsion efficiency. It is mainly used as a supplementary form for parts that the spiral grinding strip 29 cannot reach. When the rotating grinding disc 6 rotates, the material moves towards the outside of the spiral grinding assembly 1 until it falls onto the screening plate 34 through the screening hopper 33.

[0072] As the material moves along the inclined screen plate 34 toward the extension 35, small powder particles pass through the screen plate 34 and fall into the collection box 36. The material that cannot pass through the screen plate 34 moves to the extension 35 and then re-enters the return valve 25 with the airflow in the return channel 23. After impacting the diversion screen plate 31, it falls into the straight cylinder 10 for secondary grinding.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0074] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A crushing and screening device for processing tofu, characterized in that: The device includes a spiral grinding assembly (1), a grinding drive mechanism (2), a reflux feeding mechanism (3), and a cylinder (4). The grinding drive mechanism (2) includes a lifting support assembly (11) and a rotary drive assembly (12). The lifting support assembly (11) and the rotary drive assembly (12) are located in the cylinder (4). The spiral grinding assembly (1) includes a lifting grinding disc (5) and a rotary grinding disc (6). The lifting grinding disc (5) is slidably mounted on the lifting support assembly (11), and the rotary grinding disc (6) is rotatably mounted in the reflux feeding mechanism (3). The lifting grinding disc (5) is provided with a spiral grinding strip one (7), and the rotating grinding disc (6) is provided with a spiral grinding strip two (9). Both the spiral grinding strip one (7) and the spiral grinding strip two (9) are in the form of planar vortex lines, with equal pitch and matching cross-sectional profiles. When the spiral grinding strip 1 (7) and spiral grinding strip 2 (9) are offset from the top view, they can grind the material. When the spiral grinding strip 1 (7) and spiral grinding strip 2 (9) overlap from the top view, the lifting grinding disc (5) descends and forms a spiral channel between it and the rotating grinding disc (6). When the airflow flows in the channel, it can push the material to move outward along the spiral channel. The reflux feeding mechanism (3) includes a reflux component (21) and an automatic feeding component (22). The reflux component (21) is located outside the cylinder (4), and the automatic feeding component (22) is located at the top of the cylinder (4). The reflux assembly (21) includes a reflux valve (25), and the automatic feeding assembly (22) includes a low-temperature storage chamber (26) and a wheeled feeding baffle (27). The low-temperature storage chamber (26) is provided with a feeding port (32), which extends into the reflux valve (25). The airflow passing through the diversion screen plate (31) can drive the wheeled feeding baffle (27) to rotate.

2. The crushing and screening device for processing tofu as described in claim 1, characterized in that: The lifting support assembly (11) includes a grinding bracket (13), a compression spring (14), and a sliding block (15). The grinding bracket (13) is fixed inside the cylinder (4). A guide post (20) is provided on the grinding bracket (13). An arc-shaped cavity (8) is provided on the lifting grinding disc (5). The sliding block (15) is fixed in the arc-shaped cavity (8). The sliding block (15) is engaged and slidably disposed on the guide post (20). The compression spring (14) is disposed between the grinding bracket (13) and the sliding block (15).

3. The crushing and screening device for processing tofu wood according to claim 2, characterized in that: The rotary drive assembly (12) includes a motor bracket (16), a drive motor (17), a drive gear (18), and a driven gear ring (19). The motor bracket (16) is fixed to the inner wall of the cylinder (4), and the drive motor (17) is mounted on the motor bracket (16).

4. The crushing and screening device for processing tofu as described in claim 3, characterized in that: The drive gear (18) is fixed to the output shaft of the drive motor (17), and the driven gear ring (19) is fixed to the rotating grinding disc (6). The drive gear (18) and the driven gear ring (19) mesh and transmit power. When the first spiral grinding strip (7) and the second spiral grinding strip (9) press against each other, the lifting grinding disc (5) will compress the clamping spring (14) and descend.

5. The crushing and screening device for processing tofu as described in claim 4, characterized in that: The reflux assembly (21) includes a reflux channel (23) and a reflux fan (24). The reflux fan (24) is located inside the reflux channel (23). The reflux valve (25) is located at the end of the reflux channel (23). The reflux valve (25) is provided with an exhaust port (30). The reflux valve (25) is provided with a flow divider plate (31) arranged inside.

6. The crushing and screening device for processing tofu as described in claim 5, characterized in that: The cryogenic storage chamber (26) is located above the reflux valve (25), and the wheel-type discharge baffle (27) is rotatably located in the discharge port (32).

7. The crushing and screening device for processing tofu as described in claim 6, characterized in that: The rotating grinding disc (6) is provided with a straight cylindrical part (10), which is rotatably disposed in the return valve (25). The inside of the straight cylindrical part (10) is also provided with a crushing blade (37), which can rotate with the rotating grinding disc (6).

8. The crushing and screening device for processing tofu as described in claim 7, characterized in that: The cylinder (4) has a screening hopper (33) in the middle position, and the cylinder (4) has an inclined screening plate (34) below the screening hopper (33), and a collection box (36) is provided below the screening plate (34).

9. A crushing and screening device for processing tofu as described in claim 8, characterized in that: The return channel (23) has a horizontally connected chamber (28) extending into the cylinder (4) on one side. The screening plate (34) has an extension (35) located in the horizontally connected chamber (28) and the return channel (23). The horizontally connected chamber (28) has an inclined baffle (29).

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