Multi-stage ultrafine grinding machine

Abstract

The invention discloses a multi-stage pulverizing ultrafine pulverizer, comprising: a pulverizing barrel, provided with a cylindrical pulverizing chamber; a feeding mechanism, connected to the middle section side wall of the pulverizing chamber; an inner gear ring, fixed to the lower inner wall of the pulverizing chamber; a turntable, located in the lower inner cavity of the inner gear ring, with crushing hammers evenly distributed on the outer periphery; a first-stage grading reflux hood, extending downward from the upper part of the pulverizing chamber to the upper part of the inner cavity of the inner gear ring, with a material flow ascending annular channel formed between its outer wall and the inner wall of the pulverizing chamber; an arc-shaped guide cover, covering the outer periphery of the upper port of the pulverizing chamber, and guiding the material from the material flow ascending annular channel into the first-stage grading reflux hood; a first-stage grading wheel, located in the upper inner cavity of the first-stage grading reflux hood, with the top of the first-stage grading wheel located in the middle hole of the arc-shaped guide cover, to grade the material. The multi-stage pulverizing ultrafine pulverizer has high pulverizing efficiency, good fineness, large output, compact structure, and low energy consumption and manufacturing cost under the same output.

Description

Technical Field

[0001] The invention relates to a pulverizer, in particular to a multi-stage pulverizing ultra-fine pulverizer, and belongs to the technical field of pulverizing equipment. Background Art

[0002] Crushing is a very important process in the feed industry. It mainly uses external forces such as hammers and crushing teeth to hit and shear the materials, cut the materials, and make the materials fine particles and powder. After the materials are crushed, the specific surface area increases, which is conducive to animal digestion and absorption. The existing crushing systems often use hammer screen mills, screenless air flow mills, etc.

[0003] The Chinese invention patent with publication number CN212702198U discloses a hammer mill rotor and a hammer mill, including a central axis and a plurality of hammer frame plates vertically connected to the central axis, the hammer frame plates are provided with a plurality of frame plate through holes for passing the hammer pins, and also include baffles and a plurality of spacing bracket assemblies, the spacing bracket assemblies include at least two groups of bracket side plates, the bracket side plates are provided with pin through holes matching the frame plate through holes, at least two groups of bracket side plates are connected end to end and arranged between the hammer frame plates, the baffles are provided with baffle notches for placing the hammers, the bracket side plates, the hammer frame plates, and the hammers are connected by pins, and the pins pass through the frame plate through holes, the pin through holes, and the hammers.

[0004] The hammer mill is equipped with a circle of screens in the circumferential direction of the hammer except for the feed inlet. The hammers hit the materials to break them, and the wind draws the qualified materials from the inside of the screen to the outside of the screen to enter the next process. The crushing fineness of the material depends on the aperture of the screen and the gap between the hammer and the screen. Due to the low manufacturing precision of the hammer and the limited installation size of the screen arc, the crushing fineness of the material is very limited; it can only be used for coarse or fine crushing, not for ultra-fine crushing.

[0005] The Chinese invention patent application with publication number CN114273023A discloses a multi-stage superfine pulverizer, including a pulverizing mechanism, which includes: a pulverizing disk, rotatably arranged on the pulverizing mechanism; a hammer knife, fixedly connected to the circumferential edge of the pulverizing disk; a gear ring, fixedly connected to the pulverizing mechanism, the gear ring cooperates with the hammer knife to crush materials; a blocking member is provided on the gear ring, which is used to block the rising large particles and rebound the large particles back to the gap area between the gear ring and the hammer knife for secondary pulverization.

[0006] This multi-stage ultra-fine pulverizer belongs to screenless air flow pulverization. The fineness is mainly determined by the linear speed of the pulverizing hammer, the centrifugal force generated by the material and the length of the path of material impact. When the linear speed of the same type of equipment is constant, the path of material impact is lengthened, that is, the turntable diameter increases, the turntable speed decreases, and the centrifugal force generated decreases; increasing the speed will consume too much energy. Due to the decrease in centrifugal force, the mass of the single particle material that can flow back into the pulverizing chamber decreases, the mass of the discharged material particles increases, and the overall fineness of the pulverization decreases. Therefore, traditional multi-stage ultra-fine pulverizers are generally used for fine pulverization and small-volume ultra-fine pulverization, and cannot achieve large-volume ultra-fine pulverization. Summary of the invention

[0007] The purpose of the present invention is to overcome the problems existing in the prior art and provide a multi-stage ultrafine pulverizer with high pulverizing efficiency, good fineness, large output, compact structure, low energy consumption and manufacturing cost under the same output.

[0008] In order to solve the above technical problems, a multi-stage ultrafine pulverizer of the present invention comprises:

[0009] A grinding cylinder is provided with a cylindrical grinding chamber;

[0010] A feeding mechanism connected to the middle side wall of the first pulverizing chamber;

[0011] An inner gear ring 1 is fixed to the lower inner wall of the crushing chamber 1 and is evenly distributed with crushing teeth;

[0012] The rotating disc 1 is located in the lower inner cavity of the inner gear ring 1, and the outer periphery is evenly distributed with crushing hammer heads 1, which shear the materials together with the crushing teeth of the inner gear ring 1;

[0013] The first-stage classification return hood extends downward from the upper part of the crushing chamber 1 to the upper part of the inner cavity of the inner gear ring 1, and the outer wall of the first-stage classification return hood and the inner wall of the crushing chamber 1 form an annular channel 1 for the material flow to rise;

[0014] An arc-shaped flow guide cover 1, covering the outer periphery of the upper port of the pulverizing chamber 1, directing the material from the material flow ascending annular channel 1 into the primary classification reflux cover;

[0015] The primary classification wheel is located in the upper inner cavity of the primary classification reflux cover, and the top of the primary classification wheel is located in the middle hole of the arc-shaped guide cover 1 to classify the materials in one level.

[0016] As an improvement of the present invention, the present invention also includes:

[0017] The second crushing chamber is arranged side by side with the first crushing chamber, and each of them is closed and tangent to the other;

[0018] The second inner gear ring is fixed to the lower inner wall of the second crushing chamber and is evenly distributed with crushing teeth;

[0019] The second rotating disc is located in the lower inner cavity of the second inner gear ring, and the second crushing hammer heads are evenly distributed on the outer periphery, which shear the materials together with the crushing teeth of the second inner gear ring;

[0020] The secondary classification return hood extends downward from the upper part of the second crushing chamber to the upper part of the inner cavity of the second inner gear ring, and the outer wall of the second crushing chamber and the inner wall of the second crushing chamber form the second material flow ascending annular channel;

[0021] The second arc-shaped flow guide cover covers the outer periphery of the upper port of the second crushing chamber, and guides the material from the second material flow ascending annular channel into the secondary classification reflux cover;

[0022] A secondary classification wheel is located in the upper inner cavity of the secondary classification reflux cover, and the top of the secondary classification wheel is located in the middle hole of the second arc-shaped guide cover for secondary classification of materials;

[0023] The classification shell is located above the arc-shaped guide cover 1 and the arc-shaped guide cover 2, and is communicated with the inner cavity of the primary classification wheel and the secondary classification wheel respectively, so that the two crushing units are connected in series.

[0024] As a further improvement of the present invention, the present invention also includes:

[0025] The third-stage classification return hood is located directly above the second-stage classification wheel, with its lower end butted against the middle hole of the second arc-shaped guide cover and its upper end extending out of the top hole of the classification shell;

[0026] The arc-shaped guide cover three covers the top hole of the grading shell to guide the materials on the top of the grading shell into the three-stage grading reflux cover.

[0027] As a further improvement of the present invention, the upper inner cavity of the three-stage classification reflux cover is provided with a three-stage classification wheel, the top of the three-stage classification wheel is located in the middle hole of the arc-shaped guide cover three, and the material is classified into three levels.

[0028] As a further improvement of the present invention, the middle hole of the arc-shaped guide cover 3 is connected to a discharge barrel extending upward, and the side wall of the discharge barrel is connected to a discharge port.

[0029] As a further improvement of the present invention, the diameter of the first crushing chamber is greater than the diameter of the second crushing chamber.

[0030] As a further improvement of the present invention, the turntable 1 is fixed at the upper end of the crushing spindle 1, and the lower end of the crushing spindle 1 is fixed with a spindle 1 pulley; the turntable 2 is fixed at the upper end of the crushing spindle 2, and the lower end of the crushing spindle 2 is fixed with a spindle 2 pulley; the spindle 1 pulley and the spindle 2 pulley are driven by the same crushing motor, or are driven by their respective crushing motors.

[0031] As a further improvement of the present invention, the first-stage classifying wheel is fixed to the lower end of the classifying impeller shaft one, the middle section of the classifying impeller shaft one is supported in a classifying bearing seat one through a bearing, the classifying bearing seat one passes through the classifying shell and is fixed to the top of the classifying shell; the upper end of the classifying impeller shaft one is driven by a fineness classifying motor one through a coupling.

[0032] As a further improvement of the present invention, the secondary classifying wheel is fixed at the lower end of the second classifying impeller shaft, the tertiary classifying wheel is fixed at the middle part of the second classifying impeller shaft, the upper part of the second classifying impeller shaft is supported in the second classifying bearing seat through a bearing, the second classifying bearing seat passes through the discharging barrel and is fixed at the top of the discharging barrel; the upper end of the second classifying impeller shaft is driven by the second fineness classifying motor through a coupling.

[0033] As a further improvement of the present invention, the crushing chamber one and the crushing chamber two are respectively supported above the wind tube, and the bottom plates of the crushing chamber one and the crushing chamber two are respectively provided with air inlet holes, and the side walls or the bottoms of the two wind tubes are provided with air supply ports and regulating dampers, and the bottoms of the wind tubes are fixed on the machine base.

[0034] As a further improvement of the present invention, the middle section of the crushing main shaft one is supported in the crushing bearing seat one through a bearing, and the middle section of the crushing main shaft two is supported in the crushing bearing seat two through a bearing, and the lower ends of the crushing bearing seat one and the crushing bearing seat two are respectively fixed at the bottom of the wind cylinder.

[0035] As a further improvement of the present invention, two maintenance columns are fixed side by side on the machine base, and fixed lower hinge seats are respectively welded to the lower parts of the two maintenance columns. Lifting hydraulic cylinders are respectively hinged on the two fixed lower hinge seats, and the tops of the piston rods of the two lifting hydraulic cylinders are respectively hinged to the lower middle part of the maintenance swing arms, and the roots of the two maintenance swing arms are respectively hinged to the upper parts of the corresponding maintenance columns. The free ends of the two maintenance swing arms are respectively connected with lifting half rings, and the two lifting half rings are respectively fixed on the flanges of the arc-shaped guide cover one and the arc-shaped guide cover two.

[0036] As a further improvement of the present invention, column support ears are respectively welded on the tops of the two inspection columns, and swing arm locking ears are respectively provided on the upper middle parts of the two inspection swing arms. When the piston rod of the lifting hydraulic cylinder is extended to open the arc-shaped guide cover one and the arc-shaped guide cover two and rotate them to a vertical state, the pin holes of the column support ears and the swing arm locking ears are aligned, and a locking pin is inserted into them together.

[0037] As a further improvement of the present invention, lock pin sleeves are welded on the outer sides of the swing arm lock ears, the lock pin is located in the lock pin sleeve, a lock pin sleeve long groove is provided on the top of the lock pin sleeve, a limiting protrusion is welded on the middle part of the lock pin, the limiting protrusion is located in the lock pin sleeve long groove, and handles are provided on the outer ends of the swing arm lock ears.

[0038] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The multi-stage crushing is connected in series in sequence, and the coarsely crushed material enters the medium crushing and fine crushing; the characteristics of material crushing are fully utilized, and the larger particles of material are first crushed by the first-stage crushing unit to avoid the finer materials from gathering in the coarse crushing chamber. The material that has passed the first-stage crushing enters the second and third stages for further crushing more quickly, avoiding excessive crushing in the previous stage. By increasing the unit production capacity of the material and reducing the energy consumption of the system, the equipment has high crushing efficiency;

[0039] 2. The grinding chamber used for coarse grinding has a larger space, which improves the material capacity, and speeds up the feeding and discharging speeds. The utilization rate of each level of grinding chamber is very high. The proportion of coarse and fine classification can be adjusted by adjusting the rotation speed of each level of grading wheel, so that the material that meets the fineness requirements can quickly enter the next level.

[0040] 3. One device can complete multi-stage crushing, occupying a small area, with higher processing precision and lower manufacturing cost. It can realize various working conditions and meet the crushing requirements of various varieties. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0042] Figure 1 It is a front view of the multi-stage superfine pulverizer of the present invention;

[0043] Figure 2 for Figure 1 A top view of

[0044] Figure 3 for Figure 2 Sectional view along AA;

[0045] Figure 4 for Figure 1 Sectional view along BB;

[0046] Figure 5 for Figure 1 Left view of

[0047] Figure 6 It is a three-dimensional diagram of the multi-stage superfine pulverizer of the present invention;

[0048] Figure 7 It is a three-dimensional exploded view of the multi-stage superfine pulverizer of the present invention;

[0049] In the figure: 1. base; 2. air cylinder; 3. crushing cylinder; 4. feeding mechanism; 4a. feeding motor; 4b. feeding auger; 5. inner gear ring 1; 6. crushing main shaft 1; 7. crushing bearing seat 1; 8. main shaft 1 pulley; 9. turntable 1; 10. crushing hammer head 1; 11. arc guide cover 1; 12. first-level classification return flow cover; 13. fineness classification motor 1; 14. classification impeller shaft 1; 15. classification bearing seat 1; 16. first-level classification wheel; 17. classification shell; 18. inner gear ring 2; 19. crushing main shaft 2; 20. crushing bearing seat 2; 21. main shaft 2 pulley; 22. turntable 2; 23. crushing hammer head 2; 24. fineness classification motor 2; 25. classification impeller shaft 2; 26. Classification bearing seat 2; 27. Secondary grading wheel; 28. Arc guide cover 2; 29. ​​Secondary grading return flow cover; 30. Crushing motor; 30a. Main driving wheel; 30b. Belt; 31. Tensioning structure; 31a. Tensioning bracket; 31b. Tensioning wheel; 31c. Guide rod; 31d. Adjusting screw; 32. Arc guide cover 3; 33. Third-level grading return flow cover; 34. Third-level grading wheel; 35. Discharge barrel; 36. Discharge port; 37. Maintenance column; 38. Lifting hydraulic cylinder; 39. Maintenance swing arm; 39a. Swing arm locking ear; 40. Lifting half ring; 41. Column support ear; 42. Lock pin; 42a. Limiting protrusion; 42b. Handle; 43. Lock pin sleeve. Implementation

[0050] In the following description of the present invention, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0051] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0053] like Figures 1 to 7 As shown, the multi-stage pulverizing ultrafine pulverizer of the present invention comprises a feeding mechanism 4, a pulverizing cylinder 3, a grading shell 17, a discharging cylinder 35, a wind tube 2 and a machine base 1, wherein the pulverizing cylinder 3 is located above the wind tube 2, and the bottom of the wind tube 2 is fixed on the machine base 1. The pulverizing cylinder 3 is provided with cylindrical pulverizing chamber 1 and pulverizing chamber 2 side by side, and the two pulverizing chambers are independent of each other and connected, and the circumferences of the connection are tangent. The diameter of the pulverizing chamber 1 is greater than the diameter of the pulverizing chamber 2.

[0054] The feeding mechanism 4 is connected to the middle side wall of the crushing chamber 1, and the feeding mechanism 4 includes a feeding auger 4b driven by a feeding motor 4a. The bottom plates of the crushing chamber 1 and the crushing chamber 2 are respectively provided with air inlets, and the side walls or bottoms of the two air cylinders 2 are provided with air supply ports and regulating dampers.

[0055] An inner gear ring 5 is fixed to the lower inner wall of the crushing chamber and is evenly distributed with crushing teeth; a turntable 9 is provided in the lower inner cavity of the inner gear ring 5, and crushing hammer heads 10 are evenly installed on the outer periphery of the turntable 9. Each crushing hammer head 10 and the crushing teeth of the inner gear ring 5 shear the material together.

[0056] The turntable 9 is fixed to the upper end of the crushing main shaft 6, the middle section of the crushing main shaft 6 is supported in the crushing bearing seat 7 through a bearing, and the lower end of the crushing bearing seat 7 is fixed to the bottom of the wind tube 2.

[0057] A first-stage grading reflux hood 12 is provided at the upper part of the crushing chamber 1. The first-stage grading reflux hood 12 is conical in shape with a larger upper part and a smaller lower part, and its lower end extends to the upper part of the inner cavity of the inner gear ring 1 5. The outer wall thereof and the inner wall of the crushing chamber 1 form an annular channel for rising material flow.

[0058] The upper port of the pulverizing chamber 1 is covered with an arc-shaped flow guide cover 11, and the concave arc surface of the arc-shaped flow guide cover 11 communicates with the material flow ascending annular channel 1 and the top of the first-level classification return cover 12.

[0059] A first-stage classifying wheel 16 is provided in the upper inner cavity of the first-stage classifying reflux cover 12 , and the top of the first-stage classifying wheel 16 is located in the middle hole of the arc-shaped guide cover 11 .

[0060] The raw material fed by the feeding mechanism 4 falls downward from the outside of the primary grading reflux cover 12 into the bottom of the crushing chamber 1. The turntable 9 rotates at high speed, and the crushing hammers 10 on its outer periphery hit and shear the material at high speed. The airflow enters the crushing chamber 1 from below and is crushed under the action of airflow and physics. The material after being hit flies to the inner gear ring 5 at high speed and is crushed again by the crushing teeth.

[0061] After the primary crushing, the material rises along the material flow ascending annular channel 1 to the top of the crushing chamber 1, and is introduced into the upper port of the primary classification return cover 12 by the arc-shaped guide cover 11. Under the suction effect of the negative pressure at the outlet, it turns to the primary classification wheel 16. The high-speed rotation of the primary classification wheel 16 causes the material to generate centrifugal force. The material particles with larger particle size have greater centrifugal force and are thrown back to the bottom of the crushing chamber 1 for crushing again, thus realizing the primary classification of the material. The medium particles that meet the primary classification requirements pass through the primary classification wheel 16 and enter the classification shell 17 upward.

[0062] The first-stage classifying wheel 16 is fixed to the lower end of the classifying impeller shaft 14, the middle section of the classifying impeller shaft 14 is supported in the classifying bearing seat 15 through a bearing, and the classifying bearing seat 15 passes through the classifying shell 17 and is fixed to the top of the classifying shell 17; the upper end of the classifying impeller shaft 14 is driven by the fineness classifying motor 13 through a coupling. By adjusting the speed of the fineness classifying motor 13, the size of the centrifugal force can be adjusted, thereby changing the fineness of the first-stage discharge.

[0063] An inner tooth ring 2 18 is fixed to the lower inner wall of the second crushing chamber, and crushing teeth are evenly distributed on the inner circumference of the inner tooth ring 2 18. A turntable 22 is provided in the lower inner cavity of the inner tooth ring 2 18, and the turntable 22 is fixed to the upper end of the second crushing main shaft 19. The middle section of the second crushing main shaft 19 is supported in the crushing bearing seat 20 through a bearing, and the lower end of the crushing bearing seat 20 is fixed to the bottom of the wind tube 2.

[0064] The circumference of the second rotating disk 22 is evenly distributed with two crushing hammer heads 23, and each crushing hammer head 23 and the crushing teeth of the second inner gear ring 18 shear the material together.

[0065] A secondary grading reflux hood 29 is provided at the upper part of the second crushing chamber. The secondary grading reflux hood 29 is in a cone shape that is wide at the top and narrow at the bottom, and the lower end extends to the upper part of the inner cavity of the second inner gear ring 18. The outer wall of the secondary grading reflux hood 29 and the inner wall of the second crushing chamber form the second annular channel for the rising flow of the material.

[0066] The upper end of the second crushing chamber is covered with an arc-shaped guide cover 28, and the concave arc surface of the arc-shaped guide cover 28 connects the second flow ascending annular channel and the top of the secondary classification return cover 29. The arc-shaped guide cover 28 is connected with the arc-shaped guide cover 11 as a whole.

[0067] The upper inner cavity of the secondary classification return hood 29 is provided with a secondary classification wheel 27, the top of which is located in the middle hole of the arc-shaped guide cover 28, for secondary classification of the material.

[0068] The classifying shell 17 is located above the arc-shaped guide cover 1 11 and the arc-shaped guide cover 28 , and is communicated with the inner cavities of the primary classifying wheel 16 and the secondary classifying wheel 27 , respectively, so that the two crushing units are connected in series.

[0069] A third-stage classification reflux hood 33 is provided directly above the second-stage classification wheel 27 , and the lower end of the third-stage classification reflux hood 33 is connected to the middle hole of the arc-shaped guide cover 28 , and an ascending channel for the material flow is formed between the outer wall of the third-stage classification reflux hood 33 and the inner wall of the classification shell 17 .

[0070] The upper end of the three-stage grading return flow cover 33 extends out from the top hole of the grading shell 17. The top hole of the grading shell 17 is covered with an arc-shaped guide cover 32. The concave arc surface of the arc-shaped guide cover 32 communicates the outer periphery of the three-stage grading return flow cover 33 with the top of the three-stage grading return flow cover 33.

[0071] A three-stage classification wheel 34 is provided in the upper inner cavity of the three-stage classification return hood 33. The top of the three-stage classification wheel 34 is located in the middle hole of the arc-shaped guide cover 32 to perform three-stage classification on the materials.

[0072] The middle hole of the arc-shaped guide cover 32 is connected to a discharge barrel 35 extending upward, and the side wall of the discharge barrel 35 is connected to a discharge port 36 .

[0073] The secondary classifying wheel 27 is fixed to the lower end of the classifying impeller shaft 25, the tertiary classifying wheel 34 is fixed to the middle of the classifying impeller shaft 25, the upper part of the classifying impeller shaft 25 is supported in the classifying bearing seat 26 through a bearing, the classifying bearing seat 26 passes through the discharge barrel 35 and is fixed to the top of the discharge barrel 35; the upper end of the classifying impeller shaft 25 is driven by the fineness classifying motor 24 through a coupling.

[0074] The three-stage grading wheel 34 can also be driven independently, so that the rotation speed can be adjusted independently.

[0075] After the primary classification, the medium-sized particles enter the classification shell 17 from the bottom of one end, and then enter the third-level classification reflux cover 33 from the upper part of the other end along the concave arc surface of the arc-shaped guide cover 32. Since the particles are still heavy after the primary crushing and the centrifugal force is large, they cannot pass through the high-speed rotating third-level classification wheel 34, and fall downward from the lower end of the third-level classification reflux cover 33 into the second-level classification wheel 27. Under the centrifugal force of the high-speed rotating second-level classification wheel 27, they are thrown out into the second-level classification reflux cover 29, and then fall into the bottom of the second crushing chamber.

[0076] The turntable 22 rotates at high speed, and the crushing hammers 23 on its outer periphery allow airflow to enter the crushing chamber 2 from below, and the materials are crushed under the action of airflow and physics. The materials after being hit fly to the inner gear ring 2 18 at high speed and are crushed again by the crushing teeth.

[0077] After the re-crushing, the material rises along the material flow ascending annular channel 2 to the top of the second crushing chamber, and is guided into the secondary classification return hood 29 by the arc-shaped guide cover 28. Under the suction effect of the negative pressure at the outlet, it turns to the secondary classification wheel 27. The high-speed rotation of the secondary classification wheel 27 causes the material to generate centrifugal force. The centrifugal force of the material particles with medium particle size is still large, and they are thrown back to the bottom of the second crushing chamber for crushing again, realizing the secondary classification of the material. The finer particles that meet the requirements of the secondary classification pass through the secondary classification wheel 27 and enter the tertiary classification return hood 33 upward.

[0078] Similarly, under the suction effect of the negative pressure at the outlet, the finer particles enter the three-stage classification wheel 34 for the third-stage classification, and those that do not meet the requirements are still thrown back to the three-stage classification return cover 33, and continue to fall down to the second crushing chamber to be crushed. The ultra-fine particles that meet the fineness requirements can continue to pass through the three-stage classification wheel 34, enter the discharge barrel 35, and then flow out from the discharge port 36.

[0079] like Figure 4 , Figure 7 As shown, a main shaft pulley 8 is fixed to the lower end of the crushing main shaft 6, a main shaft pulley 21 is fixed to the lower end of the crushing main shaft 19, and a main driving wheel 30a is installed at the lower end of the rotor shaft of the crushing motor 30. The main shaft pulley 8 and the main shaft pulley 21 can be driven by the same crushing motor 30, that is, the main driving wheel 30a simultaneously drives the main shaft pulley 8 and the main shaft pulley 21 through the belt 30b.

[0080] The belt 30b is tensioned by a tensioning structure 31, which includes a tensioning bracket 31a, a tensioning wheel 31b, a guide rod 31c and an adjusting screw 31d. The tensioning wheel 31b is located between the main shaft pulley 8 and the main shaft pulley 21 to increase the wrap angle of the belt 30b.

[0081] The tensioning bracket 31a is U-shaped, and the axle of the tensioning wheel 31b is supported between the two arms of the tensioning bracket 31a. Two guide rods 31c are welded to the outer side of the horizontal side of the tensioning structure 31. Guide sleeves are fixed to the inner wall of the base 1. The guide rods 31c are respectively inserted into the guide sleeves and extend out from the side wall holes of the base 1.

[0082] A pair of two adjusting screws 31d are welded to the outer side of the horizontal side of the tensioning structure 31, and the outer ends of the adjusting screws 31d also extend from the side wall holes of the base 1 to control the distance between the tensioning structure 31 and the side wall of the base 1, thereby controlling the tensioning angle of the tensioning wheel 31b.

[0083] The diameters of the main shaft pulley 8 and the main shaft pulley 21 can be the same, so that the rotation speeds of the turntable 1 9 and the turntable 2 22 are the same.

[0084] The diameter of the main shaft two pulley 21 can be smaller than the diameter of the main shaft one pulley 8, so that the rotation speed of the turntable two 22 is higher than the rotation speed of the turntable one 9.

[0085] The first spindle pulley 8 and the second spindle pulley 21 can also be driven by their own crushing motors 30 respectively, so that the rotation speed can be adjusted more freely and conveniently to meet the crushing requirements of different materials and different particle sizes.

[0086] like Figure 2 , Figures 5 to 7 As shown, the present invention is provided with an inspection mechanism, which is convenient for inspection and maintenance, and the arc-shaped guide cover 1 11 and the arc-shaped guide cover 2 28 connected as one can be directly opened. The inspection mechanism includes an inspection column 37, a lifting hydraulic cylinder 38, an inspection swing arm 39, a lifting half ring 40 and a locking mechanism.

[0087] Two maintenance columns 37 are fixed on the machine base 1 side by side, and fixed lower hinge seats are respectively welded to the lower parts of the two maintenance columns 37, and lifting hydraulic cylinders 38 are respectively hinged on the two fixed lower hinge seats. The tops of the piston rods of the two lifting hydraulic cylinders 38 are respectively hinged to the lower middle part of the maintenance swing arms 39, and the roots of the two maintenance swing arms 39 are respectively hinged to the upper parts of the corresponding maintenance columns 37. The free ends of the two maintenance swing arms 39 are respectively connected with lifting half rings 40, and the two lifting half rings 40 are respectively fixed on the flanges of the arc guide cover 11 and the arc guide cover 28.

[0088] After removing the flange bolts of the arc-shaped guide cover 1 1 and the arc-shaped guide cover 2 28, the piston rods of the two lifting hydraulic cylinders 38 are pushed upward synchronously, pushing the two maintenance swing arms 39 to swing upward around the hinge axis at the root, and the arc-shaped guide cover 1 1 and the arc-shaped guide cover 2 28 are lifted up through the two lifting half rings 40, so as to facilitate the replacement of the hammer head or other maintenance.

[0089] The tops of the two inspection columns 37 are respectively welded with column ears 41, and the middle upper parts of the two inspection swing arms 39 are respectively provided with swing arm locking ears 39a. When the piston rod of the lifting hydraulic cylinder 38 extends to open the arc-shaped guide cover 11 and the arc-shaped guide cover 28 and rotate to a vertical state, the column ears 41 are aligned with the pin holes of the swing arm locking ears 39a. At this time, the locking pin 42 is inserted into the pin holes of the column ears 41 and the swing arm locking ears 39a to lock the inspection swing arm 39. Even if there is a problem with the lifting hydraulic cylinder 38, safety during maintenance can be ensured.

[0090] The outer side of the swing arm lock ear 39a is respectively welded with a lock pin sleeve 43, the lock pin 42 is located in the lock pin sleeve 43, the top of the lock pin sleeve 43 is provided with a lock pin sleeve 43 long slot, and the middle of the lock pin 42 is welded with a limit protrusion 42a, which is located in the lock pin sleeve 43 long slot to prevent the lock pin 42 from coming out of the lock pin sleeve 43. The outer ends of the swing arm lock ears 39a are respectively provided with handles 42b, when the column support ear 41 is aligned with the pin hole of the swing arm lock ear 39a, the lock pin 42 is directly pushed by the handle 42b to slide inward along the lock pin sleeve 43 until the lock pin 42 is reliably inserted into the pin holes of the column support ear 41 and the swing arm lock ear 39a, and at this time, the limit protrusion 42a reaches the other end of the long slot of the lock pin sleeve 43.

[0091] The above is only a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation modes without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. The technical features not described in the present invention can be realized by or using existing technologies, which will not be repeated here.

Claims

1. A multi-stage ultrafine pulverizer, characterized in that: include: A grinding cylinder is provided with a cylindrical grinding chamber; A feeding mechanism connected to the middle side wall of the first pulverizing chamber; An inner gear ring 1 is fixed to the lower inner wall of the crushing chamber 1 and is evenly distributed with crushing teeth; The rotating disc 1 is located in the lower inner cavity of the inner gear ring 1, and the outer periphery is evenly distributed with crushing hammer heads 1, which shear the materials together with the crushing teeth of the inner gear ring 1; The first-stage classification return hood extends downward from the upper part of the crushing chamber 1 to the upper part of the inner cavity of the inner gear ring 1, and the outer wall of the first-stage classification return hood and the inner wall of the crushing chamber 1 form an annular channel 1 for the material flow to rise; An arc-shaped flow guide cover 1, covering the outer periphery of the upper port of the pulverizing chamber 1, directing the material from the material flow ascending annular channel 1 into the primary classification reflux cover; A first-stage classifying wheel is located in the upper inner cavity of the first-stage classifying reflux cover, and the top of the first-stage classifying wheel is located in the middle hole of the arc-shaped guide cover 1 to classify the materials in one stage; The second crushing chamber is arranged side by side with the first crushing chamber, and each of them is closed and tangent to the other; The second inner gear ring is fixed to the lower inner wall of the second crushing chamber and is evenly distributed with crushing teeth; The second rotating disc is located in the lower inner cavity of the second inner gear ring, and the second crushing hammer heads are evenly distributed on the outer periphery, which shear the materials together with the crushing teeth of the second inner gear ring; The secondary classification return hood extends downward from the upper part of the second crushing chamber to the upper part of the inner cavity of the second inner gear ring, and the outer wall of the second crushing chamber and the inner wall of the second crushing chamber form the second material flow ascending annular channel; The second arc-shaped flow guide cover covers the outer periphery of the upper port of the second crushing chamber, and guides the material from the second material flow ascending annular channel into the secondary classification reflux cover; A secondary classification wheel is located in the upper inner cavity of the secondary classification reflux cover, and the top of the secondary classification wheel is located in the middle hole of the second arc-shaped guide cover for secondary classification of materials; The classification shell is located above the arc-shaped guide cover 1 and the arc-shaped guide cover 2, and is communicated with the inner cavity of the primary classification wheel and the secondary classification wheel respectively, so that the two crushing units are connected in series.

2. The multi-stage superfine pulverizer according to claim 1, characterized in that: Also includes: The third-stage classification return hood is located directly above the second-stage classification wheel, with its lower end butted against the middle hole of the second arc-shaped guide cover and its upper end extending out of the top hole of the classification shell; The arc-shaped guide cover three covers the top hole of the grading shell to guide the materials on the top of the grading shell into the three-stage grading reflux cover.

3. The multi-stage superfine pulverizer according to claim 2, characterized in that: The upper inner cavity of the three-stage classification reflux cover is provided with a three-stage classification wheel, the top of which is located in the middle hole of the arc-shaped guide cover 3, so as to perform three-stage classification on the materials.

4. The multi-stage superfine pulverizer according to claim 3, characterized in that: The middle hole of the arc-shaped guide cover 3 is connected to a discharge barrel extending upward, and the side wall of the discharge barrel is connected to a discharge port.

5. The multi-stage superfine pulverizer according to claim 1, characterized in that: The diameter of the first crushing chamber is greater than the diameter of the second crushing chamber.

6. The multi-stage superfine pulverizer according to claim 1, characterized in that: The turntable 1 is fixed on the upper end of the crushing main shaft 1, and the lower end of the crushing main shaft 1 is fixed with a main shaft 1 pulley; the turntable 2 is fixed on the upper end of the crushing main shaft 2, and the lower end of the crushing main shaft 2 is fixed with a main shaft 2 pulley; the main shaft 1 pulley and the main shaft 2 pulley are driven by the same crushing motor, or are driven by their respective crushing motors.

7. The multi-stage ultrafine pulverizer according to claim 1, characterized in that: The first-stage classifying wheel is fixed to the lower end of the classifying impeller shaft one, the middle section of the classifying impeller shaft one is supported in the classifying bearing seat one through a bearing, the classifying bearing seat one passes through the classifying shell and is fixed to the top of the classifying shell; the upper end of the classifying impeller shaft one is driven by the fineness classifying motor one through a coupling.

8. The multi-stage superfine pulverizer according to claim 4, characterized in that: The secondary classifying wheel is fixed to the lower end of the second classifying impeller shaft, the tertiary classifying wheel is fixed to the middle of the second classifying impeller shaft, the upper part of the second classifying impeller shaft is supported in the second classifying bearing seat through a bearing, the second classifying bearing seat passes through the discharge barrel and is fixed to the top of the discharge barrel; the upper end of the second classifying impeller shaft is driven by the second fineness classifying motor through a coupling.

9. The multi-stage superfine pulverizer according to claim 6, characterized in that: The first and second crushing chambers are supported above the wind tubes respectively, and air inlet holes are respectively arranged on the bottom plates of the first and second crushing chambers. Air supply ports and regulating dampers are arranged on the side walls or the bottoms of the two wind tubes, and the bottoms of the wind tubes are fixed on the machine base.

10. The multi-stage ultrafine pulverizer according to claim 9, characterized in that: The middle section of the pulverizing main shaft 1 is supported in the pulverizing bearing seat 1 through a bearing, and the middle section of the pulverizing main shaft 2 is supported in the pulverizing bearing seat 2 through a bearing. The lower ends of the pulverizing bearing seat 1 and the pulverizing bearing seat 2 are respectively fixed to the bottom of the wind tube.

11. The multi-stage ultrafine pulverizer according to claim 9, characterized in that: Two maintenance columns are fixed side by side on the machine base, and fixed lower hinge seats are respectively welded to the lower parts of the two maintenance columns. Lifting hydraulic cylinders are respectively hinged on the two fixed lower hinge seats. The tops of the piston rods of the two lifting hydraulic cylinders are respectively hinged to the lower middle part of the maintenance swing arms, and the roots of the two maintenance swing arms are respectively hinged to the upper parts of the corresponding maintenance columns. The free ends of the two maintenance swing arms are respectively connected with lifting half rings, and the two lifting half rings are respectively fixed on the flanges of the arc guide cover one and the arc guide cover two.

12. The multi-stage ultrafine pulverizer according to claim 11, characterized in that: The tops of the two inspection columns are respectively welded with column support ears, and the middle parts of the two inspection swing arms are respectively provided with swing arm locking ears. When the piston rod of the lifting hydraulic cylinder is extended to open the arc guide cover 1 and the arc guide cover 2 and rotate them to a vertical state, the pin holes of the column support ears and the swing arm locking ears are aligned, and the locking pins are inserted together.

13. The multi-stage ultrafine pulverizer according to claim 12, characterized in that: A lock pin sleeve is welded on the outside of the swing arm lock ear, the lock pin is located in the lock pin sleeve, a lock pin sleeve long groove is provided on the top of the lock pin sleeve, a limiting protrusion is welded on the middle of the lock pin, the limiting protrusion is located in the lock pin sleeve long groove, and handles are provided on the outer ends of the swing arm lock ears.

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