Drying bamboo powder crushing and screening system

Abstract

This invention discloses a drying bamboo powder pulverizing and sieving system. The pulverizing and sieving system includes a pulverizing and sieving mechanism. Inside the pulverizing and sieving mechanism, along a first direction, are sequentially arranged a pulverizing component, a sieving component at the top of the pulverizing component, and a negative pressure component at the top of the sieving component. An input pipe is provided on one side of the pulverizing component. The sieving component consists of at least two sieving modules and at least two cylindrical rings. The sieve aperture of the top sieving module is smaller than or equal to that of the bottom sieving module. The at least two cylindrical rings are detachably fixed together by a connecting mechanism, and the sieving modules and cylindrical rings are detachably installed. In an embodiment of this invention, the suction airflow generated by the negative pressure component transports the pulverized bamboo powder from bottom to top, allowing it to pass sequentially through each layer of sieving modules with progressively narrowing sieve apertures. This enables the bamboo powder to complete particle size classification during pneumatic conveying, preventing the powder from accumulating on the sieve surface for a long time and forming agglomerates, thus reducing the frequency of sieve cleaning.

Description

Technical Field

[0001] This invention relates to the field of bamboo powder processing equipment technology, specifically to a drying bamboo powder pulverizing and sieving system. Background Technology

[0002] In the production and processing of bamboo powder, crushing and sieving are key processes that determine the particle size and uniformity of the finished bamboo powder. Because the microscopic morphology of bamboo powder after crushing is fibrous and burr-like, the powder particles are easy to hook and entangle with each other to form agglomerates. In addition, the dried bamboo powder itself has a high moisture content and toughness. Therefore, the sieving efficiency and anti-clogging performance of the sieving process are crucial and directly affect the batch quality and yield stability of the finished bamboo powder.

[0003] In related technologies, a combination of crushing and screening devices is used to crush and classify bamboo powder. For example, bamboo raw materials are crushed into powder by crushing blades, and then the powder is passed through a screen for particle size classification to obtain bamboo powder products within the target particle size range. This achieves continuous production while meeting the fineness requirements of bamboo powder.

[0004] However, during the bamboo powder sieving process, the fibrous, bristle-like microstructure of the pulverized bamboo powder makes it easy for the powder particles to clump together on the sieve surface. When the pulverized bamboo powder passes through the sieve, the agglomerated material continuously accumulates on the sieve surface and gradually embeds into the sieve holes, resulting in a continuous reduction in the effective sieving area and a significant decrease in sieving efficiency. Under these circumstances, the continuity of the sieving process and the uniformity of the finished bamboo powder particle size are easily affected. If the sieve becomes clogged, production needs to be interrupted for manual cleaning, which can easily lead to reduced production efficiency and insufficient batch qualification rate of finished products. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a drying bamboo powder pulverizing and screening system, which can improve the technical problem of easy clogging of the screen during the bamboo powder screening process, which leads to a decrease in screening efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, embodiments of the present invention provide a drying bamboo powder pulverizing and sieving system, including a pulverizing and sieving mechanism. Inside the pulverizing and sieving mechanism, a pulverizing component, a sieving component located at the top of the pulverizing component, and a negative pressure component located at the top of the sieving component are arranged sequentially along a first direction. An input pipe is provided on one side of the pulverizing component. The sieving component consists of at least two sieving modules and at least two cylindrical rings. The sieve holes of the top sieving module are smaller than or equal to those of the bottom sieving module. The at least two cylindrical rings are detachably fixed together by a connecting mechanism. The sieving modules and the cylindrical rings are detachably installed.

[0007] In one embodiment, the crushing and screening mechanism has a base at the bottom, and at least two layers of the cylindrical rings are connected to the top of the base. A top cover is provided on the upper part of the at least two layers of the cylindrical rings. The top cover is in the shape of an inverted funnel, and the negative pressure component is connected to the top of the top cover. The screening component, the base, the cylindrical rings, the top cover, the crushing component, and the negative pressure component are all centered on a first direction.

[0008] In one embodiment, a ventilation valve is provided on the bottom side where the top of the base meets the cylindrical ring, the axial direction of the ventilation valve is perpendicular to the first direction, and the negative pressure component is a powder suction pump.

[0009] In one embodiment, the sieving module includes an upper clamping member, a lower clamping member, and a screen located between the upper clamping member and the lower clamping member. The upper clamping member and the lower clamping member are vertically distributed with corresponding grooves along the circumferential direction. The inner wall of the cylinder is provided with protrusions that match the grooves along the circumferential direction. The protrusions are vertically distributed with a first direction as the axis. The height between adjacent protrusions is greater than the total height of the sieving module. The lower clamping member is used to overlap the upper part of the protrusions.

[0010] In one embodiment, a pusher is provided on the side of the groove near the first direction, the pusher being used to abut against the inner wall of the cylinder and cover the outside of the groove.

[0011] In one embodiment, the pushing member includes: a connecting member disposed radially in a first direction toward the groove; a telescopic rod passing through the connecting member and extending toward the groove; and a pressing member having a vertical projected area greater than or equal to the groove, wherein the telescopic rod and the pressing member are movably connected.

[0012] In one embodiment, the extrusion member includes a metal plate and a rubber block fixed to the surface of the metal plate. The metal plate is rotatably connected to the telescopic rod, and the telescopic rod is threadedly connected to the connecting member.

[0013] In one embodiment, the connecting mechanism includes a threaded rod and at least one wing nut connected to the threaded rod. The threaded rod is a rod body or a bolt. The side surface of the cylindrical ring is provided with a connecting lug, and the surface of the connecting lug is provided with a connecting hole. The threaded rod is used to pass through the adjacent connecting hole perpendicularly.

[0014] In a second aspect of this application, embodiments of the present invention provide a drying bamboo powder pulverizing and sieving system, comprising the pulverizing and sieving mechanism as described above, and further comprising a stirring dryer, a first bamboo powder collector, and a second bamboo powder collector, wherein at least two of the pulverizing and sieving mechanisms form pulverizing and sieving mechanism A and pulverizing and sieving mechanism B; the stirring dryer is used to dry bamboo powder, and the stirring dryer is connected to pulverizing and sieving mechanism A via the first bamboo powder collector, which is used to store the bamboo powder output by the stirring dryer; pulverizing and sieving mechanism A and pulverizing and sieving mechanism B are connected via the second bamboo powder collector, which is used to store the bamboo powder output by pulverizing and sieving mechanism A; both the first bamboo powder collector and the second bamboo powder collector are provided with a powder suction pump in the middle of their input pipes, and both the first bamboo powder collector and the second bamboo powder collector are used to output bamboo powder to the pulverizing component.

[0015] In one embodiment, the sieve aperture of the inner top sieve module of the crushing and sieving mechanism A is smaller than that of the bottom sieve module, the sieve aperture of the inner top sieve module of the crushing and sieving mechanism A is larger than that of the inner sieve module of the crushing and sieving mechanism B, and the sieve aperture diameters of the top and bottom sieve modules of the crushing and sieving mechanism B are the same.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In embodiments of the present invention, the pulverizing component, the sieving component, and the negative pressure component are sequentially arranged from bottom to top inside the pulverizing and sieving mechanism along a first direction, and the input pipe is located on the side of the pulverizing component. This allows the pulverized bamboo powder to be conveyed from bottom to top by the suction airflow generated by the negative pressure component, passing sequentially through each layer of sieving modules with progressively narrowing screen openings. This enables the bamboo powder to complete particle size classification during pneumatic conveying, preventing powder from accumulating on the screen surface and forming agglomerates, thus reducing the frequency of screen cleaning. Simultaneously, the cylinder rings are detachably fixed via a connecting mechanism, and the sieving modules are detachably installed and removed from the cylinder rings. This allows each layer of sieving modules to be independently disassembled and cleaned or have different screen opening specifications replaced, thereby flexibly meeting the requirements for different bamboo powder fineness, improving equipment maintenance efficiency, reducing downtime caused by screen blockage, and ensuring a stable increase in the continuous production efficiency and finished product particle size qualification rate of the bamboo powder pulverizing and sieving system. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a schematic diagram of the crushing and sieving mechanism of the present invention; Figure 3This is a cross-sectional view of the crushing and sieving mechanism of the present invention; Figure 4 This is an exploded view of the upper and lower clamping components of the present invention; Figure 5 This is a top view of the sieving module structure of the present invention; Figure 6 This is a schematic diagram of the sieving component structure of the present invention; Figure 7 This is a schematic diagram of the pushing member structure of the present invention; Figure 8 This is an exploded view of the pusher structure of the present invention; In the picture: 100. Crushing and sieving mechanism; 101. Base; 102. Top cover; 103. Ventilation valve; 110. Crushing and sieving mechanism A; 120. Crushing and sieving mechanism B; 200. Crushing assembly; 210. Input pipe; 300. Screening assembly; 310. Screening module; 311. Upper clamping component; 312. Lower clamping component; 313. Screen mesh; 314. Groove; 320. Cylinder ring; 321. Protrusion block; 322. Connecting ear; 323. Connecting hole; 330. Pushing component; 331. Connecting component; 332. Telescopic rod; 333. Extrusion component; 3331. Metal plate; 3332. Rubber block; 400. Negative pressure component; 500. Connecting mechanism; 510. Threaded rod; 520. Wing nut; 600. Stirring dryer; 700. First bamboo powder collector; 800. Second bamboo powder collector. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or working state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0019] In the first aspect embodiment, such as Figure 1As shown, the present invention provides a drying bamboo powder pulverizing and sieving system. The pulverizing and sieving system described herein has other processing systems for bamboo raw materials before processing the bamboo raw materials into powder. Due to the natural characteristics of bamboo powder itself, namely high moisture content and high toughness, the surface of bamboo powder appears burr-like under microscopic observation, making it more prone to agglomeration. Therefore, this solution is mainly for further processing of such pre-processed bamboo powder.

[0020] This system mainly involves a pre-stirred dryer (600) and a first bamboo powder collector (700) and a second bamboo powder collector (800) for collecting bamboo powder. The stirred dryer (600) is a hot air circulating dryer or a condensation dehumidification dryer. After dehumidification, the bamboo powder enters the first bamboo powder collector (700), and is then output by the first bamboo powder collector (700) to the crushing and screening mechanism A (110) for the first coarse screening process. Subsequently, it is output by the crushing and screening mechanism A (110) to the second bamboo powder collector (800), and then output a second time to the crushing and screening mechanism B (120) for the second fine screening. The finely screened bamboo powder still retains its original characteristics under microscopic conditions, but its particle size is reduced, that is, the diameter of the bamboo powder can be controlled. Under microscopic observation, the surface of the bamboo powder is still burr-like, and its inherent fibrous burr-like morphological characteristics are maintained.

[0021] In a further embodiment, the crushing and sieving mechanism A (110) and the crushing and sieving mechanism B (120) are structurally similar, differing only in the specific mesh size of the internal sieve openings. The crushing and sieving mechanism A (110) serves as a primary sieving device, with smaller sieve openings closer to the top, such as the 80-100 mesh sieving module (310) and the 100-120 mesh sieving module (310) from bottom to top. This ensures that fibrous bamboo powder is partially sieved out in the 80-100 mesh sieving module (310), passes through the 100-120 mesh sieving module (310), and bamboo powder below 100-120 mesh returns to the bottom crushing assembly (200) for further crushing. This multi-layered sieving effect reduces the workload of a single 100 mesh sieving module (310) and minimizes the occurrence of bamboo powder directly agglomerating and clogging the sieve openings.

[0022] The crushing and sieving mechanism B (120) mainly consists of a double-layered 200-mesh sieving module (310). Since the bamboo raw material is in strip-shaped fiber form after processing by other processing systems in this embodiment, even if bamboo powder passes through the lower 200-mesh sieving module (310), it will pass through vertically. Therefore, a double-layered 200-mesh sieving module (310) is provided so that the bamboo powder can be sieved twice to make the micro-particle bamboo powder particle size more uniform.

[0023] In a further embodiment, an overall control scheme for the crushing and screening mechanism A (110) and the crushing and screening mechanism B (120) is also provided, that is, an external PLC controller is provided, which controls the start and stop of the crushing components (200) of the crushing and screening mechanism A (110) and the crushing and screening mechanism B (120) through two different external power sources, such as motors, gearboxes, and transmission belts.

[0024] For example, when the first bamboo powder collector (700) outputs bamboo powder to the crushing and sieving mechanism A (110) through the powder suction pump, the ventilation valve (103) acts as a check valve for switching directions or a three-way reversing check valve. It has a sieving structure for gas-solid isolation inside. The sieving structure adopts the form of a perforated plate holding a filter plate, that is, it consists of two layers of perforated plates and a metal filter screen sandwiched between them. The perforated plate has a hole diameter of 0.5mm to 2mm, and the mesh size of the metal filter screen is much larger than that of the sieving module (310). The perforated plate and the filter screen are fixed by bolts, so that the internal airflow is discharged through the filter screen and the bamboo powder is trapped inside the base (101) of the crushing and sieving mechanism A (110). It enters the side of the crushing component (200) through the input pipe (210). When the ventilation direction of the ventilation valve (103) is reversed, the bamboo powder trapped near the sieving structure will be blown back to the inside. The crushing component (200) is a disc crushing mechanism or a hammer crushing mechanism. At this time, the bamboo powder mainly stays in the lower part for crushing. Due to the movement of the crushing component (200), the lighter bamboo powder will also be slightly lifted up.

[0025] After the crushing component (200) operates alone for a certain period of time T1 (e.g., T1 is 30 to 120 seconds, which can be determined by adjustment according to the batch size and initial particle size of bamboo powder), the crushing component (200) stops operating, and the negative pressure component (400) at the top is activated. At this time, the ventilation valve (103) changes from exhaust function to intake function, so that the negative pressure attraction formed by the negative pressure component (400) will form a stable negative pressure extraction airflow inside the crushing and screening mechanism A (110) until the internal crushing is completed. The bamboo powder moves upward continuously due to Bernoulli's principle. During the movement process, it will be sieved at the screening module (310) inside the cylinder (320) at different positions until a certain time t1 (for example, t1 is 10 seconds to 60 seconds, which can be determined by debugging according to the batch quantity of bamboo powder and the screening effect) is reached. Then the negative pressure component (400) stops working, and the bamboo powder at the screening component (300) falls back to the crushing component (200) due to gravity. Then the crushing component (200) runs again for T1 time, which is one cycle operation.

[0026] The operation mode of the crushing and screening mechanism B (120) is similar to that of the crushing and screening mechanism A (110), and the principle is the same. The difference is that the bamboo powder processed by the crushing and screening mechanism B (120) is the result of the crushing and screening mechanism A (110). Therefore, as a fine screening device, the operation time T2 of the crushing component (200) of the crushing and screening mechanism B (120) is more than twice that of T1, and the blades of the crushing component (200) of the crushing and screening mechanism B (120) are also more dense to achieve the fine screening effect afterward.

[0027] The above-described system's workflow primarily addresses the issue of bamboo powder, which is fibrous in its microscopic state. Under normal conditions, the fibrous bamboo powder tends to entangle around the central axis and is difficult to disperse. Furthermore, after processing in the pre-processing system, the bamboo powder's own burrs increase the agglomeration effect, making it very easy for it to adhere to the screen (313) due to gravity. The above method, with the screen (313) positioned at the top and the crushing component (200) at the bottom, significantly solves the problem of bamboo powder easily agglomerating and clogging the screen (313), and ensures that the agglomerated bamboo powder falls promptly onto the crushing component (200) for secondary processing. This reduces the problem of screen (313) clogging. The side feeding method and the micro-fibrous bamboo powder directly impact the outer cutting blade, and will not directly adhere to the central shaft. The rapidly rotating cutting blade will also stir the internal airflow, making it easier for the airflow to carry the cut bamboo powder to be sucked by the negative pressure component (400). For agglomerated fibrous bamboo powder, the outer powder will be peeled off first, so that the inner flocculent bamboo powder can be exposed and moved upward. Finally, it will fall back to the crushing component (200) area for secondary crushing, reducing the situation of direct agglomeration and adhesion to the rotating central shaft.

[0028] In the second aspect of the embodiment, the specific structure of the crushing and screening mechanism (100) is given. When the crushing and screening mechanism (100) is used as crushing and screening mechanism A (110) or crushing and screening mechanism B (120), the only difference is the height of the cylinder ring (320) and the size of the sieve holes of the internal screening module (310). Therefore, this embodiment mainly describes the specific structural components of the disclosed crushing and screening mechanism (100).

[0029] The crushing and sieving mechanism (100) mainly includes a crushing component (200), a sieving component (300) and a negative pressure component (400) arranged in a first direction. The crushing component (200) is located inside the base (101), and a support frame in the shape of a bearing seat is provided on the top inside the base (101). That is, after the crushing component (200) is driven by the power source at the bottom, it rotates around the first direction as the axis. The input pipe (210) is on the side, so that the output bamboo powder first contacts the side of the crushing component (200) to form a preliminary crushing effect.

[0030] A cylindrical ring (320) is connected to the upper part of the base (101). Connecting ears (322) are fixed to the top side surfaces of both the cylindrical ring (320) and the base (101). The provided connecting mechanism (500) allows the threaded rod (510) to pass through the connecting hole (323) on the connecting ear (322), and then be fixed by a wing nut (520). This allows multiple cylindrical rings (320) to be detachably connected in this way, or between the cylindrical ring (320) and the base (101), or between the cylindrical ring (320) and the top cover (102). It can be understood that the threaded rod (510) can be a head with a limit stop, or a strip-shaped threaded rod (510), such as... Figure 2 As shown, it is symmetrically fixed only by symmetrical wing nuts (520) on the top and bottom.

[0031] like Figure 3 As shown, the cylindrical rings (320) can be disassembled accordingly, so that the staff can process the bamboo powder left on the screening module (310) after disassembly. Therefore, when the screening module (310) needs to be replaced, the screening module (310) and the cylindrical rings (320) can also be disassembled to achieve the effect of separate processing.

[0032] Specifically, the screening module (310) consists of an upper clamping member (311), a lower clamping member (312), and a screen (313) located in the middle, which are connected as follows: Figures 4 to 6 As shown, the bolts between the upper clamping member (311) and the lower clamping member (312) can be removed to allow the internal screen (313) to be taken out separately, so as to replace or process different screens (313) separately; the edges of the upper clamping member (311) and the lower clamping member (312) are provided with vertically corresponding grooves (314), and the grooves (314) correspond to the structure of the protrusions (321) on the inner wall of the cylindrical ring (320). The protrusions (321) are distributed in a circumferential shape on the inner wall of the cylindrical ring (320), and multiple protrusions (321) are arranged vertically.

[0033] It is understandable that when installing the screening module (310), the groove (314) is first aligned with the protrusion (321) and then it can be lowered. After reaching the target protrusion (321), the screening module (310) is rotated between the two adjacent protrusions (321) to allow the lower clamping part (312) to be attached to the protrusion (321) for fixing. At this time, the overall height of the screening module (310) and the distance between the two adjacent protrusions (321) are in clearance fit, and the screening module (310) and the inner wall of the cylinder (320) are in transition fit, so that the screening module (310) can be adjusted at different heights.

[0034] Its structure mainly makes the position of the screening module (310) inside the screening component (300) adjustable, and the multiple structures can also be disassembled and processed individually, so that the overall equipment is not static. In combination with the above system, independent crushing and screening mechanisms (100) can be added or reduced in the process of system production, or a certain crushing and screening mechanism (100) can be adjusted individually to achieve further process adjustment of bamboo powder production. When needed, multiple screening modules (310) can also be added to the independent crushing and screening mechanism (100). For example, according to the debugging needs, the interval between different screening modules (310) is 90-120mm.

[0035] In a further embodiment, the difference is that the screening module (310) is centered on the first direction, and its radial extension direction is located on one side of the groove (314). It is provided with a pusher (330), which is used to abut against the inner wall of the cylindrical ring (320) and cover the outside of the groove (314), so that the groove (314) is closed in the vertical direction and the screening module (310) is fixed on the inner wall of the cylindrical ring (320).

[0036] Specifically, the pushing member (330) includes a connecting member (331) for fixing, a telescopic rod (332) that moves back and forth based on the connecting member (331) as a base point, and a pressing member (333) pushed by the telescopic rod (332). The pressing member (333) includes a metal plate (3331) connected to the side near the telescopic rod (332). The metal plate (3331) is provided with a rubber block (3332) for contacting the inner wall of the cylinder ring (320). The telescopic rod (332) and the metal plate (333) 1) The metal plate (3331) can be movably embedded into the end of the telescopic rod (332) in the shape of a bearing or metal plate (3331). The metal plate (3331) can also be connected to the telescopic rod (332) using other movable embedding connection methods. The rubber block (3332) can also be replaced with other elastic materials. It is only necessary that the overall vertical projection area of ​​the rubber block (3332) and the metal plate (3331) is greater than the vertical projection of the groove (314) when they abut against the inner wall of the cylinder (320).

[0037] It is understandable that, in actual operation, when the screening module (310) has rotated and overlapped the protrusion (321), the specific form is as follows: Figure 6As shown, since the pusher (330) is initially located on one side of the groove (314) and does not interfere with it, it will not affect the installation of the screening module (310). Only when the screening module (310) rotates will the pusher (330) change from facing the protrusion (321) to facing the inner wall of the cylinder (320). At this time, the worker can hold the metal plate (3331) with one hand and rotate the telescopic rod (332) with the other hand, so that the threaded connection between the telescopic rod (332) and the connecting part (331) extends and retracts until the rubber block (3332) is pressed and fixed on the inner wall of the cylinder (320), and finally fixed to the inner wall of the cylinder (320); Figure 7 and Figure 8 As shown, at this time, the pushing member (330) generates static friction force in the squeezing manner, which makes the screening module (310) not only limit the vertical direction, but also limit the circumferential movement, preventing the screening module (310) from falling off the protrusion (321) after rotating due to equipment vibration; at the same time, the groove (314) in the vertical direction of the screening module (310) as an open channel can also be blocked by the pushing member (330) under the action of the pushing member (330).

[0038] In this embodiment, the pusher (330) can be disposed on the frame of the upper clamping member (311), i.e., as shown in the figure. Figures 4 to 6 As shown, the connector (331) is located on the rod extending radially from the upper clamping member (311) at the groove (314); when necessary, vertically symmetrical pushers (330) can also be installed on both the upper clamping member (311) and the lower clamping member (312); the connector (331) can be directly embedded and fixed at the frame of the upper clamping member (311) or the lower clamping member (312) to ensure that the frame of the overall screening module (310) is evenly stressed. If pushers (330) are provided on both sides of a radial rod at the upper clamping member (311), the forces before and after the action of the pushers (330) cancel each other out, and the forces on both sides of the radial rod are balanced, reducing the occurrence of eccentricity in the screening module (310).

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drying bamboo powder pulverizing and sieving system, characterized in that, The crushing and sieving system includes a crushing and sieving mechanism (100). Inside the crushing and sieving mechanism (100), a crushing component (200), a sieving component (300) located at the top of the crushing component (200), and a negative pressure component (400) located at the top of the sieving component (300) are arranged sequentially along the first direction. An input pipe (210) is provided on one side of the crushing component (200). The sieving assembly (300) consists of at least two sieving modules (310) and at least two cylindrical rings (320). The sieve holes of the top sieving module (310) are smaller than or equal to those of the bottom sieving module (310). The at least two cylindrical rings (320) are detachably fixed together by a connecting mechanism (500). The sieving module (310) and the cylindrical rings (320) are detachably installed together.

2. The drying bamboo powder pulverizing and sieving system according to claim 1, characterized in that, The crushing and screening mechanism (100) is provided with a base (101) at the bottom. At least two layers of the cylindrical rings (320) are connected to the top of the base (101). A top cover (102) is provided on the upper part of the at least two layers of the cylindrical rings (320). The top cover (102) is in the shape of an inverted funnel. The negative pressure component (400) is connected to the top of the top cover (102). The screening component (300), base (101), cylindrical rings (320), top cover (102), crushing component (200) and negative pressure component (400) are all centered on the first direction.

3. The drying bamboo powder pulverizing and sieving system according to claim 2, characterized in that, A ventilation valve (103) is provided on the bottom side where the top of the base (101) meets the cylindrical ring (320). The axial direction of the ventilation valve (103) is perpendicular to the first direction. The negative pressure component (400) is a powder suction pump.

4. The drying bamboo powder pulverizing and sieving system according to claim 3, characterized in that, The sieving module (310) includes an upper clamping member (311), a lower clamping member (312), and a screen (313) located between the upper clamping member (311) and the lower clamping member (312). The upper clamping member (311) and the lower clamping member (312) have grooves (314) vertically distributed in the circumferential direction. The inner wall of the cylindrical ring (320) is provided with protrusions (321) that match the groove (314). The protrusions (321) are vertically distributed with the first direction as the axis. The height between adjacent protrusions (321) is greater than the total height of the sieve module (310). The lower clamping member (312) is used to overlap the upper part of the protrusions (321).

5. The drying bamboo powder pulverizing and sieving system according to claim 4, characterized in that, The groove (314) is provided with a pusher (330) on the side near the first direction. The pusher (330) is used to abut against the inner wall of the cylindrical ring (320) and cover the outside of the groove (314).

6. The drying bamboo powder pulverizing and sieving system according to claim 5, characterized in that, The pusher (330) includes: A connector (331) is disposed radially toward the groove (314) in the first direction; Telescopic rod (332), which passes through connector (331) and extends or retracts toward groove (314); The extrusion member (333) has a vertical projection area greater than or equal to that of the groove (314), and the telescopic rod (332) is movably connected to the extrusion member (333).

7. The drying bamboo powder pulverizing and sieving system according to claim 6, characterized in that, The extrusion member (333) includes a metal plate (3331) and a rubber block (3332) fixed on the surface of the metal plate (3331). The metal plate (3331) is rotatably connected to the telescopic rod (332), and the telescopic rod (332) is threadedly connected to the connector (331).

8. The drying bamboo powder pulverizing and sieving system according to claim 1, characterized in that, The connecting mechanism (500) includes a threaded rod (510) and at least one wing nut (520) connected to the threaded rod (510). The threaded rod (510) is a rod or a bolt. The side surface of the cylindrical ring (320) is provided with a connecting lug (322). The surface of the connecting lug (322) is provided with a connecting hole (323). The threaded rod (510) is used to pass through the vertically adjacent connecting hole (323).

9. A drying bamboo powder pulverizing and sieving system according to any one of claims 1-8, characterized in that, The crushing and screening system also includes a stirring dryer (600), a first bamboo powder collector (700) and a second bamboo powder collector (800), and at least two of the crushing and screening mechanisms (100) form crushing and screening mechanism A (110) and crushing and screening mechanism B (120). The stirring dryer (600) is used to dry bamboo powder. The stirring dryer (600) is connected to the crushing and screening mechanism A (110) via a first bamboo powder collector (700). The first bamboo powder collector (700) is used to store the bamboo powder output by the stirring dryer (600). The crushing and sieving mechanism A (110) and the crushing and sieving mechanism B (120) are both used to crush and sieve bamboo powder. The crushing and sieving mechanism A (110) and the crushing and sieving mechanism B (120) are connected via a second bamboo powder collector (800). The second bamboo powder collector (800) is used to store the bamboo powder output by the crushing and sieving mechanism A (110). The first bamboo powder collector (700) and the second bamboo powder collector (800) are both equipped with a powder suction pump in the middle of the input pipe (210). The first bamboo powder collector (700) and the second bamboo powder collector (800) are both used to output bamboo powder to the crushing component (200).

10. A drying bamboo powder pulverizing and sieving system according to claim 9, characterized in that, The screen holes of the inner top sieve module (310) of the crushing and sieving mechanism A (110) are smaller than those of the bottom sieve module (310), and the screen holes of the inner top sieve module (310) of the crushing and sieving mechanism A (110) are larger than those of the inner sieve module (310) of the crushing and sieving mechanism B (120). The screen hole diameters of the top and bottom sieve modules (310) of the crushing and sieving mechanism B (120) are the same.

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