Wear-resisting structure of grinding roller tensioning connecting rod of ring roller mill

Abstract

The invention relates to the technical field of grinding equipment, and discloses a ring roller mill grinding roller tensioning connecting rod wear-resisting structure which comprises a ring roller mill body, a grinding ring is fixedly connected to the inner wall of the ring roller mill body, a plurality of rotating discs are arranged in the grinding ring, and a plurality of fixing shafts are installed between the interiors of the rotating discs; and a plurality of grinding roller mechanisms are installed outside the fixing shaft, a plurality of protection mechanisms are installed between the adjacent sides of every two adjacent rotating discs, and a blowing mechanism is installed in the ring roller mill body. Materials are ground through cooperation of the grinding roller body and the grinding ring, and when large and hard material particles are ground, the first connecting rod and the second connecting rod are folded to extrude the composite spring under resistance, so that the grinding roller body automatically shrinks towards the interior of the rotary disc to avoid obstacles, the materials are ground slightly and repeatedly, and the grinding efficiency is improved. Abrasion of the grinding roller main body and the fixed shaft caused by stress extrusion of the grinding roller main body and the fixed shaft due to direct hard contact is avoided, so that the service lives of the grinding roller main body and the grinding ring are effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, specifically to a wear-resistant structure for the tensioning connecting rod of a ring roller mill. Background Technology

[0002] The ring roller mill operates by utilizing the relative motion between multiple layers of grinding rollers and the grinding ring within the main chamber. After entering the machine, the material is thrown against the inner wall of the grinding ring under centrifugal force, where it is crushed by the powerful squeezing, impact, and shearing forces generated by the grinding rollers. Subsequently, a built-in high-precision turbine classifier uses airflow circulation to screen and collect the micro-powder that meets the particle size requirements, while unqualified materials fall back for regrinding.

[0003] The core advantages of ring roller mills lie in their high output, low energy consumption, and adjustable fineness. Compared to air jet mills and traditional ball mills, ring roller mills consume less energy, have lower investment costs, and require less floor space while achieving the same product fineness. They also offer excellent environmental performance.

[0004] However, in actual grinding operations, the hardness, particle size, and uniformity of materials vary. When the grinding roller encounters larger or harder material particles, if the roller is rigidly fixed, it will make hard contact with the material. This hard contact accelerates wear and shortens the lifespan of the grinding roller, causing the grinding roller and the shaft of the fixed roller to be subjected to enormous impact and compressive forces instantaneously. This not only accelerates the wear of the grinding roller and grinding ring themselves, but also causes excessive stress and wear on core transmission components such as the central shaft, severely shortening the overall service life of the grinding roller and increasing equipment maintenance costs and downtime. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a wear-resistant structure for the tensioning link of a ring roller mill, which solves the problem of severe hard contact wear in existing ring roller mill technology when processing uneven materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wear-resistant structure for a ring mill grinding roller tensioning link, comprising a ring mill body, a grinding ring fixedly connected to the inner wall of the ring mill body, multiple turntables arranged inside the grinding ring, multiple fixed shafts installed between the multiple turntables, multiple grinding roller mechanisms installed outside the fixed shafts, multiple protective mechanisms installed between adjacent sides of two adjacent turntables, and a purging mechanism installed inside the ring mill body; The grinding roller mechanism includes a bushing, which is rotatably connected to the outside of the fixed shaft. Multiple first outer sleeves are rotatably connected to the outer wall of the bushing. A first connecting rod is fixedly connected to the outside of the first outer sleeve. A central shaft is rotatably connected to the inside of the first connecting rod. A second connecting rod is rotatably connected to the outside of the central shaft. A second outer sleeve is fixedly connected to the outside of the second connecting rod. A grinding roller body is installed between the multiple second outer sleeves. A reset assembly is installed between the first outer sleeve and the second outer sleeve.

[0007] Preferably, the reset assembly includes a support rod, which is externally fixedly connected to the bottom end of the central shaft. An anti-detachment cover is fixedly connected to the top end of the support rod. A recoil spring is sleeved on the outside of the support rod. A first fixing seat is installed at one end of the recoil spring, and a second fixing seat is installed at the other end of the recoil spring. The first fixing seat is externally fixedly connected to the outside of the first outer sleeve, and the second fixing seat is externally fixedly connected to the outside of the second outer sleeve.

[0008] Preferably, the grinding roller body is disposed outside the grinding ring, the bottom of the second connecting rod is rotatably connected to the top of the first connecting rod, the bottom of the first connecting rod is slidably connected to the top of the support rod, the bottom of the anti-detachment cover and the top of the recoiling spring abut against each other, the bushing is sleeved inside the grinding roller body, and the fixed shaft is sleeved inside the grinding roller body.

[0009] Preferably, the fixed shafts are distributed in concentric circles at equal intervals, and the grinding roller body is disposed between adjacent sides of two adjacent turntables.

[0010] Preferably, the protective mechanism includes multiple outer shells, the outer shells are fixedly connected between adjacent sides of two adjacent turntables, multiple springs are fixedly connected inside the outer shells, a sliding plate is fixedly connected between the outer shells of the multiple springs, a graphene baffle is fixedly connected outside the sliding plate, and the graphene baffle is slidably connected outside the grinding roller body.

[0011] Preferably, the skateboard is externally slidably connected to the inner wall of the outer shell, the graphene baffle is externally slidably connected to the inside of the outer shell, and the outer shell is arranged in concentric circles at equal intervals.

[0012] Preferably, the purging mechanism includes a hollow rotating shaft, which is rotatably connected to the inside of the ring roller mill body. The hollow rotating shaft has multiple through holes on its lower side and a connecting chamber is rotatably connected to its exterior. An air supply pipe is fixedly connected to the outside of the connecting chamber, and a fan is fixedly connected to the input end of the air supply pipe. The top of the hollow rotating shaft is fixedly connected to the inside of the turntable, and multiple micro air channels are fixedly connected to the upper side of the hollow rotating shaft.

[0013] Preferably, the connecting chamber is installed outside the through hole, the micro airway is fixedly connected to the top of the turntable, and a valve is fixedly connected to the outside of the air supply pipe.

[0014] Preferably, the micro airway output end is fixedly connected to the bottom of the outer shell, and the micro airways are distributed in concentric circles at equal intervals.

[0015] Preferably, the micro air passage is disposed between adjacent sides of two adjacent grinding roller bodies, and a belt flywheel is fixedly connected to the lower side of the hollow rotating shaft.

[0016] This invention provides a wear-resistant structure for the tensioning link of a ring roller mill. It has the following beneficial effects: 1. This invention uses the grinding roller body and grinding ring to grind materials. When grinding larger and harder material particles, the first and second connecting rods fold and compress the reinforcing spring, causing the grinding roller body to automatically retract into the turntable to avoid obstacles. This allows for multiple grinding cycles in small amounts, avoiding direct hard contact that could cause the grinding roller body and fixed shaft to be compressed and wear down. This effectively improves the service life of the grinding roller body and grinding ring.

[0017] 2. This invention uses a spring to push a sliding plate, causing the graphene baffle to adhere to the outside of the grinding roller body, scraping away the material powder attached to the grinding roller body. At the same time, the shielding of the outer shell and the graphene baffle prevents material particles from falling into the interlayer of the turntable, thereby preventing vibration caused by the turntable's balance being affected, which would lead to abnormal noise during equipment operation.

[0018] 3. In this invention, air is delivered to the air supply pipe by a fan, and the hollow rotating shaft disperses the air into each micro air channel. The air is then blown laterally from the micro air channels to the inner wall of the grinding ring, which prevents dust from remaining in the grooves of the inner wall of the grinding ring and increases the friction between the grinding roller body and the grinding roller body, thereby increasing the degree of wear. Attached Figure Description

[0019] Figure 1 This is a perspective view of the main body of the ring roller mill of the present invention; Figure 2 This is a cross-sectional view of the main body of the ring roller mill of the present invention; Figure 3 This is a cross-sectional view of the grinding ring of the present invention; Figure 4 This is a partial view of the main body of the ring roller mill of the present invention; Figure 5 This is a perspective view of the grinding roller mechanism of the present invention; Figure 6 This is a cross-sectional view of the grinding roller mechanism of the present invention; Figure 7 This is a partial structural diagram of the grinding roller mechanism of the present invention; Figure 8 This is a cross-sectional view of the protective mechanism of the present invention; Figure 9 This is a cross-sectional view of the purging mechanism of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point A in the middle; Figure 11 For the present invention Figure 9 Enlarged view of section B in the middle.

[0020] The components include: 1. Ring roller mill body; 2. Grinding ring; 3. Turntable; 4. Fixed shaft; 5. Grinding roller mechanism; 6. Protective mechanism; 7. Blowing mechanism; 8. Fan; 9. Belt flywheel; 501. Bushing; 502. First outer sleeve; 503. First connecting rod; 504. Central shaft; 505. Second connecting rod; 506. Second outer sleeve; 507. Support rod; 508. Anti-detachment cover; 509. Reverse spring; 510. First fixed seat; 511. Second fixed seat; 512. Grinding roller body; 601. Outer shell; 602. Spring; 603. Slide plate; 604. Graphene baffle; 701. Hollow rotating shaft; 702. Through hole; 703. Connecting chamber; 704. Air supply pipe; 705. Valve; 706. Miniature air passage. Detailed Implementation

[0021] The technical solutions in 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.

[0022] To better understand the present invention, the above content will be described in detail below with reference to specific embodiments.

[0023] Please see the appendix Figure 1 - Appendix Figure 11 This invention provides a wear-resistant structure for a ring mill tensioning link, comprising a ring mill body 1, a grinding ring 2 fixedly connected to the inner wall of the ring mill body 1, multiple turntables 3 arranged inside the grinding ring 2, multiple fixed shafts 4 installed between the multiple turntables 3, multiple grinding roller mechanisms 5 installed outside the fixed shafts 4, multiple protective mechanisms 6 installed between adjacent sides of two adjacent turntables 3, and a blowing mechanism 7 installed inside the ring mill body 1. The ring mill body 1 is used for ultrafine grinding of non-metallic minerals with medium and low hardness. The grinding ring 2 is used to cooperate with the grinding roller mechanisms 5 to grind mineral materials. The turntables 3 are used to separate each layer of grinding roller mechanisms 5. The fixed shafts 4 are used to install the grinding roller mechanisms 5. The grinding roller mechanisms 5 are used to grind materials. The protective mechanisms 6 are used to protect the turntables 3 to prevent materials from entering the interlayer of the turntables 3. The blowing mechanism 7 is used to blow away dust adhering to the inner side of the grinding ring 2 to reduce friction. The grinding roller mechanism 5 includes a bushing 501, which is rotatably connected to the outside of a fixed shaft 4. Multiple first outer sleeves 502 are rotatably connected to the outer wall of the bushing 501. A first connecting rod 503 is fixedly connected to the outside of each first outer sleeve 502. A central shaft 504 is rotatably connected inside the first connecting rod 503. A second connecting rod 505 is rotatably connected to the outside of the central shaft 504. A second outer sleeve 506 is fixedly connected to the outside of the second connecting rod 505. A grinding roller body 512 is installed between the multiple second outer sleeves 506. The first outer sleeves 502 and the first... A reset assembly is installed between the two outer sleeves 506. The bushing 501 is used to mount the grinding roller mechanism 5 as a whole outside the fixed shaft 4. The first outer sleeve 502 is used to rotate on the outer wall of the bushing 501, so that the first connecting rod 503 can deflect. The central shaft 504 is used to fold the first connecting rod 503 and the second connecting rod 505. The second connecting rod 505 cooperates with the first connecting rod 503, so that the grinding roller body 512 can move in the interlayer of the turntable 3. The second outer sleeve 506 is used to mount the grinding roller body 512 on the fixed shaft 4.

[0024] The reset assembly includes a support rod 507, which is externally fixedly connected to the bottom end of the central shaft 504. An anti-detachment cover 508 is fixedly connected to the top end of the support rod 507. A reinforcing spring 509 is sleeved on the outside of the support rod 507. A first fixing seat 510 is installed at one end of the reinforcing spring 509, and a second fixing seat 511 is installed at the other end of the reinforcing spring 509. The first fixing seat 510 is externally fixedly connected to the outside of the first outer sleeve 502, and the second fixing seat 511 is externally fixedly connected to the outside of the second outer sleeve 506. The support rod 507 is used to support the reinforcing spring 509, the anti-detachment cover 508 is used to prevent the reinforcing spring 509 from falling off, and the reinforcing spring 509 is used to push the first outer sleeve 502 and the second outer sleeve 506 to reset. The first fixing seat 510 and the second fixing seat 511 are used to connect the reinforcing spring 509, so that the thrust of the reinforcing spring 509 is applied to the first outer sleeve 502 and the second outer sleeve 506 respectively.

[0025] The grinding roller body 512 is externally disposed inside the grinding ring 2. Through the cooperation of the two, the grinding of materials is realized. The bottom of the second connecting rod 505 is rotatably connected to the top of the first connecting rod 503 to keep the second connecting rod 505 stable. The bottom of the first connecting rod 503 is slidably connected to the top of the support rod 507 to keep the first connecting rod 503 stable. The bottom of the anti-detachment cover 508 and the top of the reinforcing spring 509 abut against each other to prevent the reinforcing spring 509 from falling off. The bushing 501 is sleeved on the inner side of the grinding roller body 512 to keep the bushing 501 stable and prevent the grinding roller body 512 from making hard contact with the fixed shaft 4. The fixed shaft 4 is sleeved inside the grinding roller body 512 to keep the grinding roller body 512 stable.

[0026] The fixed shafts 4 are distributed in concentric circles at equal intervals, so that the grinding roller bodies 512 are evenly distributed. The grinding roller bodies 512 are set between the adjacent sides of two adjacent turntables 3, so that the grinding roller bodies 512 remain stable.

[0027] The protective mechanism 6 includes multiple outer shells 601. The outer shells 601 are fixedly connected to the adjacent sides of two adjacent turntables 3. Multiple springs 602 are fixedly connected inside the outer shells 601. A sliding plate 603 is fixedly connected between the multiple springs 602. A graphene baffle 604 is fixedly connected to the outside of the sliding plate 603. The graphene baffle 604 is slidably connected to the outside of the grinding roller body 512. The outer shells 601 are used to connect and protect the internal parts. The springs 602 are used to push the sliding plate 603 to move. The sliding plate 603 is used to drive the graphene baffle 604 to move synchronously. The graphene baffle 604 is used to scrape away the debris attached to the grinding roller body 512 and block the material to prevent the material from entering the sorting of the turntable 3.

[0028] The sliding plate 603 is externally slidably connected to the inner wall of the outer shell 601, and the graphene baffle 604 is externally slidably connected to the inside of the outer shell 601. The outer shell 601 simultaneously restricts the movement direction of the sliding plate 603 and the graphene baffle 604. The outer shell 601 is arranged in concentric circles at equal intervals, so that the protective mechanism 6 is evenly distributed.

[0029] The purging mechanism 7 includes a hollow rotating shaft 701, which is rotatably connected to the inside of the ring roller mill body 1. Multiple through holes 702 are provided on the lower side of the hollow rotating shaft 701. A connecting chamber 703 is rotatably connected to the outside of the hollow rotating shaft 701. An air supply pipe 704 is fixedly connected to the outside of the connecting chamber 703. A fan 8 is fixedly connected to the input end of the air supply pipe 704. The top of the hollow rotating shaft 701 is fixedly connected to the inside of the turntable 3. Multiple... A miniature air duct 706, a hollow rotating shaft 701 for driving the turntable 3 to rotate and simultaneously supplying air, a through hole 702 for allowing air to enter the hollow rotating shaft 701, a connecting chamber 703 for transferring air, an air supply pipe 704 for connecting to the fan 8 to supply air to the connecting chamber 703, the fan 8 for supplying gas to the air supply pipe 704, and the miniature air duct 706 for blowing out the gas to clean the grinding ring 2, remove dust, and reduce friction.

[0030] The connecting chamber 703 is installed outside the through hole 702, allowing the gas in the connecting chamber 703 to smoothly enter the hollow rotating shaft 701 through the through hole 702. The micro air passage 706 is fixedly connected to the top of the turntable 3 to keep the micro air passage 706 stable. A valve 705 is fixedly connected to the outside of the gas delivery pipe 704, and the valve 705 is used to control the opening and closing of the gas delivery pipe 704.

[0031] The output end of the miniature airway 706 is fixedly connected to the bottom of the housing 601 to keep the miniature airway 706 stable. The miniature airways 706 are distributed in concentric circles at equal intervals to keep the turntable 3 stable when it rotates.

[0032] The miniature air passage 706 is set between the adjacent sides of two adjacent grinding roller bodies 512 to avoid interfering with the normal operation of the grinding roller body 512. A belt flywheel 9 is fixedly connected to the lower side of the hollow rotating shaft 701. The belt flywheel 9 is used to cooperate with the drive system to drive the hollow rotating shaft 701 to rotate through belt drive.

[0033] Working Principle: When grinding materials using the ring roller mill body 1, the drive system drives the belt flywheel 9 to rotate, causing the hollow rotating shaft 701 to drive the turntable 3 to rotate synchronously. Connected by the fixed shaft 4, the grinding roller body 512 begins to roll on the inner wall of the grinding ring 2. At this time, the material is fed into the ring roller mill body 1. The material automatically enters the gap between the turntable 3 and the grinding ring 2 through centrifugal force, and is crushed into powder by the grinding roller body 512. During the grinding process, when encountering harder materials, it is impossible to crush them into powder in one go. Multiple crushing operations are required until the material is powdered. At this point, the grinding roller body 512 cannot have hard contact with the material, otherwise it will increase the wear of the grinding roller body 512 and the fixed shaft 4, reducing its service life. Through the action of the reinforcing spring 509, when in contact with the material, the grinding roller body 512 automatically moves towards the center of the turntable 3. Simultaneously, the second outer sleeve 506 compresses the reinforcing spring 509, causing the second connecting rod 505 and the first connecting rod 503 to... Folding along the central axis 504 and supported by the support rod 507, the rewind spring 509 pushes the second outer sleeve 506 and the first outer sleeve 502, causing the second connecting rod 505 and the first connecting rod 503 to reset, thus tensioning the grinding roller body 512 and re-engaging it with the grinding ring 2 until the material is gradually ground away. This allows the grinding roller body 512 to have a floating space, thereby avoiding hard contact, effectively reducing the wear of the grinding roller body 512 and the fixed shaft 4, and increasing the service life of the grinding roller body 512 and the fixed shaft 4.

[0034] During the operation of the ring roller mill body 1, the spring 602 pushes the slide plate 603, causing the graphene baffle 604 to adhere to the grinding roller body 512. This not only does not affect the floating stroke of the grinding roller body 512, but the outer shell 601 and the graphene baffle 604 also block the material, preventing it from entering the interlayer of the turntable 3 and affecting the balance of the turntable 3 during rotation. At the same time, the graphene baffle 604 scrapes away the material adhering to the surface of the grinding roller body 512, ensuring the stable operation of the ring roller mill body 1.

[0035] When the grinding roller body 512 is working, the fan 8 delivers air into the air supply pipe 704. The air enters the hollow rotating shaft 701 through the through hole 702 in the connecting chamber 703, and then is blown into the inner groove of the grinding ring 2 by the micro air channel 706. This blows away the dust adhering to the groove of the grinding ring 2, avoiding increasing the friction between the grinding ring 2 and the grinding roller body 512, thereby minimizing the degree of wear and effectively extending the service life of the grinding ring 2 and the grinding roller body 512.

Claims

1. A wear-resistant structure for the tensioning link of a ring roller mill, comprising a ring roller mill body (1), characterized in that, The inner wall of the ring roller mill body (1) is fixedly connected to a grinding ring (2). Multiple turntables (3) are arranged inside the grinding ring (2). Multiple fixed shafts (4) are installed between the multiple turntables (3). Multiple grinding roller mechanisms (5) are installed outside the fixed shafts (4). Multiple protective mechanisms (6) are installed between adjacent sides of two adjacent turntables (3). A purging mechanism (7) is installed inside the ring roller mill body (1). The grinding roller mechanism (5) includes a bushing (501), which is rotatably connected to the outside of the fixed shaft (4). Multiple first outer sleeves (502) are rotatably connected to the outer wall of the bushing (501). A first connecting rod (503) is fixedly connected to the outside of the first outer sleeve (502). A central shaft (504) is rotatably connected to the inside of the first connecting rod (503). A second connecting rod (505) is rotatably connected to the outside of the central shaft (504). A second outer sleeve (506) is fixedly connected to the outside of the second connecting rod (505). A grinding roller body (512) is installed between the multiple second outer sleeves (506). A reset assembly is installed between the first outer sleeves (502) and the second outer sleeves (506).

2. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 1, characterized in that, The reset assembly includes a support rod (507), which is externally fixedly connected to the bottom end of the central shaft (504). An anti-detachment cover (508) is fixedly connected to the top end of the support rod (507). A reinforcing spring (509) is sleeved on the outside of the support rod (507). A first fixing seat (510) is installed at one end of the reinforcing spring (509), and a second fixing seat (511) is installed at the other end of the reinforcing spring (509). The first fixing seat (510) is externally fixedly connected to the outside of the first outer sleeve (502), and the second fixing seat (511) is externally fixedly connected to the outside of the second outer sleeve (506).

3. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 2, characterized in that, The grinding roller body (512) is disposed outside the grinding ring (2). The bottom of the second connecting rod (505) is rotatably connected to the top of the first connecting rod (503). The bottom of the first connecting rod (503) is slidably connected to the top of the support rod (507). The bottom of the anti-detachment cover (508) and the top of the retractable spring (509) abut against each other. The bushing (501) is sleeved inside the grinding roller body (512). The fixed shaft (4) is sleeved inside the grinding roller body (512).

4. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 1, characterized in that, The fixed shafts (4) are distributed in concentric circles at equal intervals, and the grinding roller body (512) is arranged between the adjacent sides of two adjacent turntables (3).

5. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 1, characterized in that, The protective mechanism (6) includes multiple outer shells (601), which are fixedly connected to the outside of two adjacent turntables (3) on adjacent sides. Multiple springs (602) are fixedly connected inside the outer shells (601), and sliding plates (603) are fixedly connected between the outside of the multiple springs (602). Graphene baffles (604) are fixedly connected to the outside of the sliding plates (603), and the graphene baffles (604) are slidably connected to the outside of the grinding roller body (512).

6. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 5, characterized in that, The slide plate (603) is externally slidably connected to the inner wall of the outer shell (601), and the graphene baffle (604) is externally slidably connected to the inside of the outer shell (601). The outer shell (601) is arranged in concentric circles at equal intervals.

7. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 6, characterized in that, The purging mechanism (7) includes a hollow rotating shaft (701), which is rotatably connected to the inside of the ring roller mill body (1). Multiple through holes (702) are provided on the lower side of the hollow rotating shaft (701). A connecting chamber (703) is rotatably connected to the outside of the hollow rotating shaft (701). An air supply pipe (704) is fixedly connected to the outside of the connecting chamber (703). A fan (8) is fixedly connected to the input end of the air supply pipe (704). The top of the hollow rotating shaft (701) is fixedly connected to the inside of the turntable (3). Multiple micro air passages (706) are fixedly connected to the upper side of the hollow rotating shaft (701).

8. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 7, characterized in that, The connecting chamber (703) is installed outside the through hole (702), the micro air passage (706) is fixedly connected to the top of the turntable (3), and the air supply pipe (704) is fixedly connected to a valve (705).

9. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 7, characterized in that, The output end of the micro airway (706) is fixedly connected to the bottom of the outer shell (601), and the micro airways (706) are distributed in concentric circles at equal intervals.

10. The wear-resistant structure for the tensioning connecting rod of a ring roller mill according to claim 7, characterized in that, The micro air passage (706) is disposed between the adjacent sides of the two adjacent grinding roller bodies (512), and a belt flywheel (9) is fixedly connected to the lower side of the hollow rotating shaft (701).

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