A straw grinding mill with adjustable grinding fineness

Abstract

This invention relates to the field of grinding equipment technology, specifically to a straw grinding mill with adjustable grinding fineness. It includes a frame, inside which a classifier rotor is installed. Below the classifier rotor is an annular flow divider wall, and below the annular flow divider wall is a grinding tank. A grinding assembly is installed inside the grinding tank. A transmission assembly is connected to the bottom of both the grinding tank and the central rotating shaft. The transmission assembly drives the grinding tank and the grinding assembly to rotate in opposite directions. In this invention, conventional structures cannot control and adjust the grinding rollers in motion when the grinding tank and grinding assembly rotate, thus failing to adjust the grinding fineness of the powder. By incorporating angle adjustment and longitudinal adjustment components, the tilt angle of the grinding rollers can be adjusted, thereby regulating the grinding fineness of the equipment. Therefore, this mechanism achieves the adjustment of the grinding roller tilt angle while the grinding rollers and grinding wall rotate, improving grinding efficiency while controlling the grinding fineness of the equipment.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, specifically to a straw grinding mill with adjustable grinding fineness. Background Technology

[0002] Straw is a general term for the stems and leaves (ears) of mature crops. It usually refers to the remaining part of wheat, rice, corn, potatoes, rapeseed, cotton, sugarcane and other crops (usually coarse grains) after the grains are harvested. Straw is rich in organic matter such as nitrogen, phosphorus, potassium, calcium and magnesium. By grinding straw into powder through a milling machine, it can be used to process feed, fuel, fertilizer, industrial raw materials and other materials.

[0003] Most existing grinding mills use a motor to drive the grinding disc to rotate, with the grinding rollers following the movement to grind the material, or the motor drives the grinding rollers to rotate, with the grinding disc remaining stationary or following the movement to grind the material. When dealing with materials with high fiber content, such as straw, there may be insufficient grinding or crushing efficiency and low grinding efficiency. At the same time, straw powder often requires different grinding fineness depending on the application, so it is necessary to improve the internal structure of the grinding mill to meet the problems of low efficiency and difficulty in fineness control that may exist in traditional grinding mills.

[0004] Therefore, it is necessary to invent a straw grinding mill with adjustable grinding fineness to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a straw grinding mill with adjustable grinding fineness. By simultaneously driving the grinding tank and the grinding roller to rotate in opposite directions, the relative speed between the material and the grinding roller and grinding disc is increased. By controlling the tilt angle of the grinding roller, the grinding fineness of the equipment can be controlled while improving grinding efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A straw grinding mill with adjustable grinding fineness is provided, comprising a frame, an internal classifier rotor for powder classification, an annular flow divider wall for powder separation below the classifier rotor, a grinding tank below the annular flow divider wall, a grinding assembly inside the grinding tank, and a central rotating shaft rotating at the axis of the grinding tank. Both the bottom ends of the grinding tank and the central rotating shaft are connected to a transmission assembly, which drives the grinding tank and the grinding assembly to rotate in opposite directions. The portion of the central rotating shaft located inside the grinding tank... Multiple rotating brackets are sequentially mounted. Multiple angle adjustment components are provided at the bottom of each rotating bracket. Each angle adjustment component includes a grinding roller body hinged to the end of the rotating bracket and an annular connecting block for controlling the angle adjustment of the multiple grinding roller bodies on the rotating bracket. The angle adjustment component is used to adjust the tilt angle of the grinding roller body. A longitudinal adjustment component is provided at the top of the central rotating shaft. The longitudinal adjustment component includes a synchronous pressing rod, which is used to synchronously control the multiple longitudinal annular connecting blocks to slide longitudinally. An electric push rod for pressing the longitudinal adjustment component is installed inside the annular diverter wall.

[0008] As a preferred embodiment of an adjustable-grind straw mill, the transmission assembly includes a gear ring, planetary gears, a gear carrier, a support base, a sun gear, a transmission belt, and a pulley. The gear ring is detachably mounted on the bottom of the grinding tank. A groove is formed on the outer side of the gear ring. Multiple planetary gears mesh on the inner side of the gear ring. The gear carrier is mounted on both sides of the planetary gears. The gear carrier at the bottom is fixedly mounted on the bottom of the frame. The support base is located at the bottom of the gear carrier and supports the rotation of the gear ring. The sun gear rotates at the center of the gear carrier and simultaneously meshes with multiple planetary gears. The top of the sun gear is fixedly connected to the central shaft. The pulley is located on one side of the frame. A transmission belt is fitted around the pulley and the outer side of the gear ring. A drive motor for rotating the pulley is mounted on its top.

[0009] As a preferred embodiment of an adjustable-grind straw mill, the angle adjustment assembly further includes a grinding roller mounting block, an L-shaped connecting rod, and a slider. The outer wall of the rotating bracket has multiple hinge slots. The top of the grinding roller mounting block is hinged to the rotating bracket via these slots. The grinding roller body rotates inside the grinding roller mounting block. The short side of the L-shaped connecting rod is hinged to one side of the grinding roller mounting block, and the long side of the L-shaped connecting rod is hinged to an annular connecting block. Multiple sliders are located inside the annular connecting block. The top of the central rotating shaft has multiple longitudinal sliding grooves, and the sliders slide longitudinally along these grooves. A threaded hole is provided on the inner side of the slider. The outer surface of the synchronous pressing rod is threaded and connected to multiple annular connecting blocks via the threaded hole.

[0010] As a preferred embodiment of an adjustable-grind straw mill, the grinding assembly further includes an ejector spring, a material-throwing disc, and an annular sealing block. A circular groove is provided at the top of the central rotating shaft, and the bottom end of the ejector spring is fixedly installed inside the circular groove. The ejector spring is used to apply an upward elastic force to the longitudinal adjustment assembly. The material-throwing disc is located at the top of the rotating bracket, and the annular sealing block is fitted at the lower middle position of the central rotating shaft. The annular sealing block is used to prevent powder leakage.

[0011] As a preferred embodiment of an adjustable-grind straw mill, a grinding wall is provided at the position where the grinding tank and the grinding roller body are adapted. The bottom end of the grinding wall is provided with a discharge slope inclined to one side. Multiple discharge holes are opened on one side of the discharge slope. The discharge holes are used to discharge the ground straw to one side of the inner wall of the frame. A sealing protrusion is provided at the center of the discharge slope. The outer edge of the sealing protrusion is in contact with the inner edge of the annular sealing block.

[0012] As a preferred embodiment of an adjustable-grind straw mill, the frame has a collecting ramp located below the discharge ramp inside. A powder flow channel is provided between the inner side of the frame and the outer side of the grinding tank. A guide ring for guiding the grinding tank is fixedly installed at the center of the collecting ramp. Multiple vent holes are opened at the top of the guide ring. A rectangular support block is provided at the bottom of the frame. A bottom limiting block is fixedly installed at the bottom of the rectangular support block. The bottom limiting block is fixedly connected to the gear frame located below. A limiting groove adapted to the contour of the support base is opened at the bottom of the bottom limiting block.

[0013] As a preferred embodiment of an adjustable grinding fineness straw mill, the support base includes bottom extension arms and rolling balls. Multiple bottom extension arms are installed at the bottom end of the gear frame and extend to the bottom of the gear ring. The rolling balls are rotatably disposed between the bottom extension arms and the gear ring.

[0014] As a preferred embodiment of an adjustable-grind straw mill, the longitudinal adjustment assembly further includes a synchronous disc, which is detachably equipped with multiple synchronous pressing rods and is located above the ejector spring. A pressing disc is installed on the telescopic end of the electric push rod, and the pressing disc is coaxially arranged with the synchronous disc. Multiple guide wheels are fixedly installed at the bottom end of the pressing disc, and the guide wheels are used to keep the synchronous disc rotating during the application of pressing force.

[0015] As a preferred embodiment of an adjustable-grind straw mill, a motor mounting base for mounting a drive motor is provided on one side of the frame, a classifier motor for driving the classifier rotor is provided at the top of the frame, an outer connecting block is provided on the outer surface of the annular diverting wall, an inner support block is provided on the inner surface of the annular diverting wall, the electric push rod is located at the bottom end of the center position of the inner support block, and the outer surface of the annular diverting wall is located inside the grinding tank.

[0016] The beneficial effects of this invention are as follows: By driving the grinding tank and grinding assembly to rotate in opposite directions through the transmission component, the relative speed between the material and the grinding roller and grinding wall can be increased, causing the material to be subjected to stronger shearing and extrusion, thereby improving grinding efficiency. When the grinding tank and grinding assembly rotate in opposite directions, the traditional structure cannot control and adjust the grinding roller in motion, thus making it impossible to adjust the grinding fineness of the powder. By setting the angle adjustment component and the longitudinal adjustment component, the tilt angle of the grinding roller can be adjusted during the rotation of the grinding assembly, thereby adjusting the grinding fineness of the equipment. Therefore, this mechanism realizes the adjustment of the tilt angle of the grinding roller while the grinding roller and grinding wall rotate relative to each other, improving grinding efficiency while controlling the grinding fineness of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a partial cross-sectional assembly diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the grinding component structure assembly of the present invention.

[0021] Figure 4 This is the present invention. Figure 3 Enlarged structural diagram at point A in the middle.

[0022] Figure 5 This is a schematic diagram of the powder flow structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the connection structure of the annular flow divider wall of the present invention.

[0024] Figure 7 This is a schematic diagram of the rotating support structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the angle adjustment component structure of the present invention.

[0026] Figure 9 This is the present invention. Figure 8 Enlarged structural diagram at point B.

[0027] Figure 10 This is a schematic diagram of the longitudinal adjustment component structure of the present invention.

[0028] Figure 11 This is the present invention. Figure 10 Enlarged structural diagram at point C.

[0029] Figure 12 This is a schematic diagram of the electric actuator structure of the present invention.

[0030] Figure 13 This is a schematic diagram of the transmission component structure of the present invention.

[0031] Figure 14 This is a schematic diagram of the bottom limiting block structure of the present invention.

[0032] Figure 15 This is a schematic diagram of the positional relationship of the rolling ball in this invention.

[0033] Figure 16 This is a schematic diagram of the positional relationship of the transmission belt in this invention.

[0034] In the picture:

[0035] 1. Frame; 101. Material collection ramp; 102. Guide ring; 103. Vent hole; 104. Rectangular support block; 105. Bottom limit block; 106. Limiting slot;

[0036] 2. Motor mounting base; 3. Drive motor; 4. Classifier motor; 5. Air outlet; 6. Air inlet; 7. Classifier rotor; 8. Annular diverter wall; 801. Outer connecting block; 802. Inner support block; 9. Electric push rod; 901. Pressing disc; 902. Guide wheel;

[0037] 10. Grinding tank body; 1001. Grinding wall; 1002. Discharge hole; 1003. Discharge ramp; 1004. Sealing protrusion;

[0038] 11. Transmission assembly; 1101. Gear ring; 1102. Planetary gear; 1103. Gear carrier; 1104. Sun gear; 1105. Transmission belt; 1106. Bottom extension arm; 1107. Rolling ball; 1108. Pulley;

[0039] 12. Grinding assembly; 1201. Central rotating shaft; 1202. Longitudinal slide groove; 1203. Ejection spring; 1204. Rotating bracket; 1205. Hinge groove; 1206. Discharge plate; 1207. Annular sealing block;

[0040] 13. Angle adjustment assembly; 1301. Grinding roller body; 1302. Grinding roller mounting block; 1303. L-shaped connecting rod; 1304. Annular connecting block; 1305. Slider; 1306. Threaded hole;

[0041] 14. Longitudinal adjustment assembly; 1401. Synchronous disc; 1402. Synchronous pressing lever. Detailed Implementation

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0044] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] refer to Figures 1 to 16This invention provides an adjustable-fineness straw grinding mill, comprising a frame 1, inside which is a classifier rotor 7 for powder classification. Below the classifier rotor 7 is an annular flow divider wall 8 for powder separation. Below the annular flow divider wall 8 is a grinding tank 10. Inside the grinding tank 10 is a grinding assembly 12, which includes a rotating central shaft 1201 located at the axis of the grinding tank 10. Both the grinding tank 10 and the bottom of the central shaft 1201 are connected to a transmission assembly 11, which drives the grinding tank 10 and the grinding assembly 12 to rotate in opposite directions. The portion of the central shaft 1201 located inside the grinding tank 10 is sequentially fitted with multiple rotating... The bracket 1204 has multiple angle adjustment components 13 at its bottom end. Each angle adjustment component 13 includes a grinding roller body 1301 hinged to the end of the rotating bracket 1204 and an annular connecting block 1304 for controlling the angle adjustment of the multiple grinding roller bodies 1301 on the rotating bracket 1204. The angle adjustment component 13 is used to adjust the tilt angle of the grinding roller body 1301. A longitudinal adjustment component 14 is provided at the top of the central rotating shaft 1201. The longitudinal adjustment component 14 includes a synchronous pressing rod 1402 for synchronously controlling the multiple longitudinal annular connecting blocks 1304 to slide longitudinally. An electric push rod 9 for pressing the longitudinal adjustment component 14 is installed inside the annular diverter wall 8.

[0047] An air outlet 5 is provided at the top of the frame 1, and an air inlet 6 extending into the annular diversion wall 8 is provided on the side wall of the frame 1. The air inlet 6 is used for feeding, and the air outlet 5 is used for discharging the graded powder. A fan is required at the bottom of the frame 1 to output an upward initial airflow. During use, the straw falls through the air inlet 6 to the top of the grinding assembly 12. The rotation of the throwing disc 1206 pushes the straw into the grinding zone. After grinding, the straw moves to the top of the collecting inclined plane 101 through the discharge slope 1003 and the discharge hole 1002. The bottom fan applies an upward initial airflow. The initial airflow, through the exhaust port 103 and the collecting inclined surface 101, lifts the ground powder upwards. The powder is then screened by the classifier rotor 7. Qualified powder is discharged, while unqualified powder is guided by the inclined surface and the annular diversion wall 8 and falls downwards through the interior of the annular diversion wall 8, awaiting subsequent grinding. When the grinding fineness needs to be adjusted, the longitudinal adjustment component 14 is pressed by the electric push rod 9, causing the synchronous pressing rod 1402 to synchronously drive multiple annular connecting blocks 1304 to slide downwards, thereby controlling the angle of the grinding roller body 1301 to meet different usage requirements.

[0048] The transmission assembly 11 includes a gear ring 1101, planetary gears 1102, a gear carrier 1103, a support base, a sun gear 1104, a transmission belt 1105, and a pulley 1108. The gear ring 1101 is detachably mounted on the bottom end of the grinding tank 10. A groove is formed on the outer side of the gear ring 1101. Multiple planetary gears 1102 mesh with the inner side of the gear ring 1101. The gear carrier 1103 is mounted on both sides of the planetary gears 1102. The gear carrier 1103 at the bottom end is fixedly mounted on the bottom of the frame 1. The support... A base is located at the bottom of the gear carrier 1103, supporting the rotation of the gear ring 1101. The sun gear 1104 rotates at the center of the gear carrier 1103 and meshes with multiple planetary gears 1102. The top of the sun gear 1104 is fixedly connected to the central shaft 1201. A pulley 1108 is located on one side of the frame 1. A transmission belt 1105 is fitted around the pulley 1108 and the outer side of the gear ring 1101. A drive motor 3 is mounted on the top of the pulley 1108 to drive its rotation. The transmission belt 1105 drives the gear ring 1101 to rotate, thereby driving the inner sun gear 1104 to rotate in the opposite direction, thus improving grinding efficiency. Fixing the gear carrier 1103 reduces the installation difficulty of the transmission assembly 11 and prevents gears from falling off.

[0049] The angle adjustment assembly 13 further includes a grinding roller mounting block 1302, an L-shaped connecting rod 1303, and a slider 1305. The outer wall of the rotating bracket 1204 has multiple hinge slots 1205. The top end of the grinding roller mounting block 1302 is hinged to the rotating bracket 1204 through the hinge slots 1205. The grinding roller body 1301 rotates inside the grinding roller mounting block 1302. The short side of the L-shaped connecting rod 1303 is hinged to one side of the grinding roller mounting block 1302. The long side of rod 1303 is hinged to annular connecting block 1304. Multiple sliders 1305 are located inside annular connecting block 1304. Multiple longitudinal grooves 1202 are provided at the top of the central rotating shaft 1201. The sliders 1305 slide longitudinally along the longitudinal grooves 1202. Threaded holes 1306 are provided on the inner side of each slider 1305. The outer surface of the synchronous pressing rod 1402 is threaded and connected to the multiple annular connecting blocks 1304 via the threaded holes 1306. This threaded connection reduces the installation difficulty of the annular connecting blocks 1304 while simultaneously controlling the downward sliding of multiple annular connecting blocks 1304. The grinding roller body 1301 can be made of lower-quality metal or non-metal materials, which reduces the difficulty of lowering the synchronous pressing rod 1402 while still satisfying the requirements for grinding straw.

[0050] The grinding assembly 12 also includes an ejector spring 1203, a material-throwing disc 1206, and an annular sealing block 1207. A circular groove is formed at the top of the central rotating shaft 1201. The bottom end of the ejector spring 1203 is fixedly installed inside the circular groove. The ejector spring 1203 applies an upward elastic force to the longitudinal adjustment assembly 14. The material-throwing disc 1206 is located at the top of the rotating bracket 1204. The annular sealing block 1207 is sleeved on the lower middle part of the central rotating shaft 1201 and prevents powder leakage. The ejector spring 1203 is designed to, after the electric push rod 9 is separated, drive the longitudinal adjustment assembly 14 upward under the weight of the grinding roller body 1301 and the upward elastic force applied by the ejector spring 1203, so that the grinding roller body 1301 returns to a state parallel to the grinding wall 1001.

[0051] A grinding wall 1001 is provided at a position adapted to the grinding roller body 1301 of the grinding tank 10. The bottom end of the grinding wall 1001 has a discharge ramp 1003 inclined to one side. Multiple discharge holes 1002 are provided on one side of the discharge ramp 1003. These discharge holes 1002 are used to discharge the ground straw towards the inner wall of the frame 1. A sealing protrusion 1004 is provided at the center of the discharge ramp 1003, and the outer edge of the sealing protrusion 1004 is in contact with the inner edge of the annular sealing block 1207. The discharge holes 1002 allow the powder to be thrown out by centrifugal force during the rotation of the grinding tank 10, facilitating its entry into the classifier rotor 7 by rising gas. The sealing protrusion 1004 supports and guides the central rotating shaft 1201, ensuring its smooth rotation.

[0052] Inside the frame 1, below the unloading ramp 1003, there is a collecting ramp 101. A powder flow channel is provided between the inner side of the frame 1 and the outer side of the grinding tank 10. A guide ring 102 for guiding the grinding tank 10 is fixedly installed at the center of the collecting ramp 101. The top of the guide ring 102 has multiple vent holes 103. A rectangular support block 104 is provided at the bottom of the frame 1. A bottom limiting block 105 is fixedly installed at the bottom of the rectangular support block 104. The bottom limiting block 105 is fixedly connected to the gear frame 1103 located below. The bottom of the bottom limiting block 105 has a limiting groove 106 that matches the contour of the support base. The guide ring 102 is provided to ensure that the grinding tank 10 can rotate smoothly and avoid large vibrations during rotation. The inclined setting of the aggregate slope 101 is also used to prevent powder from leaking out from below through the vent hole 103, causing the powder to diffuse outward.

[0053] The support base includes bottom extension arms 1106 and rolling balls 1107. Multiple bottom extension arms 1106 are mounted on the bottom end of the gear carrier 1103 and extend below the gear ring 1101. The rolling balls 1107 are rotatably disposed between the bottom extension arms 1106 and the gear ring 1101. The rolling balls 1107 and bottom extension arms 1106 are configured to support the bottom of the gear ring 1101, reducing the pressure and friction it needs to withstand during rotation.

[0054] The longitudinal adjustment assembly 14 further includes a synchronization disc 1401, on which multiple synchronization pressing rods 1402 are detachably mounted. The synchronization disc 1401 is located above the ejector spring 1203. A pressing disc 901 is mounted on the telescopic end of the electric push rod 9. The pressing disc 901 is coaxially arranged with the synchronization disc 1401. Multiple guide wheels 902 are fixedly mounted on the bottom end of the pressing disc 901. The guide wheels 902 are used to keep the synchronization disc 1401 rotating during the application of pressing force. The coaxial arrangement of the pressing disc 901 and the synchronization disc 1401 can prevent the electric push rod 9 from vibrating due to misalignment. The guide wheels 902 on the pressing disc 901 are evenly spaced around its center.

[0055] A motor mounting base 2 for mounting the drive motor 3 is provided on one side of the frame 1. A classifier motor 4 for driving the classifier rotor 7 is provided at the top of the frame 1. An outer connecting block 801 is provided on the outer surface of the annular flow divider wall 8, and an inner support block 802 is provided on the inner surface of the annular flow divider wall 8. The electric push rod 9 is located at the bottom of the center of the inner support block 802. The outer surface of the annular flow divider wall 8 is located inside the grinding tank 10. A certain gap is left between the top of the annular flow divider wall 8 and the classifier rotor 7 to allow powder that has not passed the classification to fall downwards.

[0056] This invention, through the transmission component 11 driving the grinding tank 10 and the grinding component 12 to rotate in opposite directions, can increase the relative speed of the material with respect to the grinding roller and the grinding wall 1001, causing the material to be subjected to stronger shearing and compression, thereby improving grinding efficiency. When the grinding tank 10 and the grinding component 12 rotate in opposite directions, the conventional structure cannot control and adjust the grinding roller in motion, thus making it impossible to adjust the grinding fineness of the powder. By setting the angle adjustment component 13 and the longitudinal adjustment component 14, the tilt angle of the grinding roller can be adjusted during the rotation of the grinding component 12, thereby adjusting the grinding fineness of the equipment. Therefore, this mechanism realizes the adjustment of the tilt angle of the grinding roller while the grinding roller and the grinding wall 1001 rotate relative to each other, improving grinding efficiency while controlling the grinding fineness of the equipment.

[0057] It should be stated that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to the present invention. However, such variations, as long as they do not depart from the spirit of the present invention, should be within the scope of protection of the present invention. Furthermore, some terminology used in this specification and claims is not limiting, but merely for ease of description.

Claims

1. A straw grinding mill with adjustable grinding fineness, characterized in that: The system includes a frame (1), inside which is a classifier rotor (7) for powder classification. Below the classifier rotor (7) is an annular flow divider wall (8) for powder separation. Below the annular flow divider wall (8) is a grinding tank (10). Inside the grinding tank (10) is a grinding assembly (12). The grinding assembly (12) includes a central rotating shaft (1201) that rotates at the axis of the grinding tank (10). The bottom ends of the grinding tank (10) and the central rotating shaft (1201) are connected to a transmission assembly (11). The transmission assembly (11) is used to drive the grinding tank (10) and the grinding assembly (12) to rotate in opposite directions. The portion of the central rotating shaft (1201) inside the grinding tank (10) is sequentially fitted with multiple rotating brackets (1204). The bottom end of the rotating bracket (1204) is provided with multiple angle adjustment components (13). The angle adjustment components (13) include a grinding roller body (1301) hinged to the end of the rotating bracket (1204) and an annular connecting block (1304) for controlling the angle adjustment of multiple grinding roller bodies (1301) on the rotating bracket (1204). The angle adjustment components (13) are used to adjust the tilt angle of the grinding roller body (1301). The top of the central rotating shaft (1201) is provided with a longitudinal adjustment component (14). The longitudinal adjustment component (14) includes a synchronous pressing rod (1402). The synchronous pressing rod (1402) is used to synchronously control multiple longitudinal annular connecting blocks (1304) to slide longitudinally. An electric push rod (9) for pressing the longitudinal adjustment component (14) is installed inside the annular diversion wall (8). The angle adjustment assembly (13) further includes a grinding roller mounting block (1302), an L-shaped connecting rod (1303), and a slider (1305). The outer wall of the rotating bracket (1204) is provided with multiple hinge slots (1205). The top end of the grinding roller mounting block (1302) is hinged to the rotating bracket (1204) through the hinge slots (1205). The grinding roller body (1301) rotates inside the grinding roller mounting block (1302). The short side of the L-shaped connecting rod (1303) is hinged to one side of the grinding roller mounting block (1302). The long side of the rod (1303) is hinged to the annular connecting block (1304). Multiple sliders (1305) are located inside the annular connecting block (1304). Multiple longitudinal grooves (1202) are provided at the top of the central rotating shaft (1201). The sliders (1305) slide longitudinally along the longitudinal grooves (1202). Threaded holes (1306) are provided on the inner side of the sliders (1305). The outer surface of the synchronous pressing rod (1402) is threaded and is connected to multiple annular connecting blocks (1304) through the threaded holes (1306). The grinding assembly (12) also includes an ejector spring (1203), a slinger (1206), and an annular sealing block (1207). The top end of the central rotating shaft (1201) is provided with a circular groove. The bottom end of the ejector spring (1203) is fixedly installed inside the circular groove. The ejector spring (1203) is used to apply an upward elastic force to the longitudinal adjustment assembly (14). The slinger (1206) is located at the top end of the rotating bracket (1204). The annular sealing block (1207) is sleeved on the lower middle position of the central rotating shaft (1201). The annular sealing block (1207) is used to prevent powder leakage. The grinding tank (10) is fitted with a grinding wall (1001) at a position that matches the grinding roller body (1301). The bottom end of the grinding wall (1001) is provided with a discharge slope (1003) that is inclined to one side. A plurality of discharge holes (1002) are provided on one side of the discharge slope (1003). The discharge holes (1002) are used to discharge the ground straw to one side of the inner wall of the frame (1). A sealing protrusion (1004) is provided at the center of the discharge slope (1003). The outer edge of the sealing protrusion (1004) is in contact with the inner edge of the annular sealing block (1207). The longitudinal adjustment assembly (14) further includes a synchronization disc (1401), which is detachably equipped with multiple synchronization pressing rods (1402). The synchronization disc (1401) is located above the ejector spring (1203). The telescopic end of the electric push rod (9) is equipped with a pressing disc (901), which is coaxially arranged with the synchronization disc (1401). Multiple guide wheels (902) are fixedly installed at the bottom end of the pressing disc (901). The guide wheels (902) are used to keep the synchronization disc (1401) rotating during the application of pressing force.

2. A straw grinding mill with adjustable grinding fineness according to claim 1, characterized in that: The transmission assembly (11) includes a gear ring (1101), planetary gears (1102), a gear carrier (1103), a support base, a sun gear (1104), a transmission belt (1105), and a pulley (1108). The gear ring (1101) is detachably installed at the bottom of the grinding tank (10). A groove is provided on the outer side of the gear ring (1101). Multiple planetary gears (1102) mesh on the inner side of the gear ring (1101). The gear carrier (1103) is installed on both sides of the planetary gears (1102). The gear carrier (1103) at the bottom is fixedly installed at the bottom of the frame (1). A support base is located at the bottom of the gear carrier (1103). The support base is used to support the rotation of the gear ring (1101). The sun gear (1104) rotates at the center of the gear carrier (1103) and meshes with multiple planetary gears (1102) at the same time. The top of the sun gear (1104) is fixedly connected to the central rotating shaft (1201). The pulley (1108) is located on one side of the frame (1). The pulley (1108) and the outer side of the gear ring (1101) are fitted with a transmission belt (1105). The top of the pulley (1108) is provided with a drive motor (3) for driving its rotation.

3. The straw grinding mill with adjustable grinding fineness according to claim 2, characterized in that: Inside the frame (1), below the unloading ramp (1003), there is a collecting ramp (101). A powder flow channel is left between the inner side of the frame (1) and the outer side of the grinding tank (10). A guide ring (102) for guiding the grinding tank (10) is fixedly installed at the center of the collecting ramp (101). Multiple exhaust holes (103) are opened at the top of the guide ring (102). A rectangular support block (104) is provided at the bottom of the frame (1). A bottom limiting block (105) is fixedly installed at the bottom of the rectangular support block (104). The bottom limiting block (105) is fixedly connected to the gear frame (1103) located below. A limiting groove (106) adapted to the contour of the support base is opened at the bottom of the bottom limiting block (105).

4. A straw grinding mill with adjustable grinding fineness according to claim 3, characterized in that: The support base includes a bottom extension arm (1106) and a rolling ball (1107). The bottom extension arms (1106) are mounted on the bottom end of the gear frame (1103) and extend to the bottom of the gear ring (1101). The rolling ball (1107) is rotatably disposed between the bottom extension arm (1106) and the gear ring (1101).

5. A straw grinding mill with adjustable grinding fineness according to claim 4, characterized in that: The frame (1) has a motor mounting base (2) for mounting the drive motor (3) on one side. The top of the frame (1) has a classifier motor (4) for driving the classifier rotor (7) to rotate. The outer surface of the annular flow divider (8) has an outer connecting block (801). The inner surface of the annular flow divider (8) has an inner support block (802). The electric push rod (9) is located at the bottom of the center of the inner support block (802). The outer surface of the annular flow divider (8) is located inside the grinding tank (10).

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