Scattering classifier

Abstract

The invention relates to the technical field of mechanical equipment, and discloses a scattering grader which is characterized in that the bottom of a first-stage coarse material screening pipe is arranged on the outer side of the top of an air inlet pipe in a sleeving mode, and a first-stage discharging gap is formed between the first-stage coarse material screening pipe and the air inlet pipe; the bottom end of the coarse material feeding pipe extends into the first-stage coarse material screening pipe, and a bottom outlet of the coarse material feeding pipe is located over an air outlet of the air inlet pipe. The scattering mechanism is installed between the coarse material feeding pipe and the air inlet pipe, the top of the first-stage coarse material screening pipe is sleeved with the bottom of the second-stage coarse material screening pipe, and a second-stage discharging gap is formed between the first-stage coarse material screening pipe and the second-stage coarse material screening pipe. The third-stage coarse material screening device is connected to the top of the second-stage coarse material screening pipe and comprises a wind field centrifugal mechanism, a guide plate and a third-stage coarse material collecting hopper, the wind field centrifugal mechanism is used for centrifugally screening materials by generating a dynamic rotating wind field, and the guide plate is used for guiding the centrifugally thrown materials into the third-stage coarse material collecting hopper; and the fine material discharging pipe is connected to the position above the center of the wind field centrifugal mechanism.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment technology, and more specifically, to a dispersing and grading machine. Background Technology

[0002] In cement grinding systems within the cement and building materials industry, V-type air classifiers and dynamic air classifiers are commonly used for material dispersion and classification. Dispersing materials aims to fully separate fine powder from material clumps, allowing them to be carried by airflow into the dynamic air classifier for further classification, thus increasing finished product yield and production efficiency. However, the large size, height, and irregular structure of V-type air classifiers result in a large footprint in the workshop, making ductwork layout difficult, leading to obstructed airflow, increased pipe wear, and higher system resistance and fan power consumption. Furthermore, V-type and dynamic air classifiers require additional ductwork connections, further increasing the overall process layout height, civil engineering costs, and system fan power consumption. Therefore, it is necessary to design a new type of dispersion and classification machine to address the problems of existing equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a dispersing and grading machine with the advantages of strong dispersing effect and good grading effect.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a dispersing and classifying machine, comprising: an air inlet pipe, a coarse material feed pipe, a primary coarse material screening pipe, a secondary coarse material screening pipe, a tertiary coarse material screener, a dispersing mechanism, and a fine material discharge pipe; The bottom of the primary coarse material screening tube is sleeved on the outside of the top of the air inlet pipe, and a primary discharge gap is provided between the two. The bottom end of the coarse material feed pipe extends obliquely into the body of the primary coarse material screening pipe. The bottom outlet of the coarse material feed pipe is located directly above the air outlet of the air inlet pipe. The air inlet pipe is used to introduce an air source to drive the material upward. The dispersing mechanism is installed between the coarse material feed pipe and the air inlet pipe, and the dispersing mechanism is used to disperse the material leaking from the coarse material feed pipe; The bottom of the secondary coarse material screening tube is sleeved on the outside of the top of the primary coarse material screening tube, and a secondary discharge gap is provided between the two. The tertiary coarse material screener is connected to the top of the secondary coarse material screener. The tertiary coarse material screener includes a wind farm centrifugal mechanism, a guide plate, and a tertiary coarse material collection hopper. The wind farm centrifugal mechanism is used to centrifuge and screen materials by generating a dynamic rotating wind field. The guide plate is used to guide the centrifuged material into the tertiary coarse material collection hopper. The fine material discharge pipe is connected above the center of the wind farm centrifugal mechanism and is used to receive airflow and materials that have not been centrifuged.

[0005] As a preferred embodiment of the present invention, the air intake pipe includes a vertical pipe section and a bent pipe section, the bottom end of the vertical pipe section is connected to the top end of the bent pipe section, and a slag discharge port is provided at the bottom of the bent pipe section.

[0006] As a preferred embodiment of the present invention, a baffle and guide ring is provided at the top of the vertical tube section. The baffle and guide ring includes a conical open ring and a vertical circular ring. The top end of the vertical circular ring is fixedly connected to the bottom end of the conical open ring, and the bottom end of the vertical circular ring is correspondingly connected to the top of the vertical tube section. The conical open ring is an upwardly protruding conical ring. The center of the conical ring is a circular opening, and several elongated holes along the radial direction are provided through the ring surface.

[0007] As a preferred embodiment of the present invention, a primary coarse material screening pipe is fitted with a primary coarse material collection hopper at its bottom. The side of the primary coarse material collection hopper is provided with a mounting hole corresponding to the air inlet pipe. The top of the bent section of the air inlet pipe passes through the mounting hole, and the bottom of the bent section is located outside the primary coarse material collection hopper.

[0008] As a preferred embodiment of the present invention, the dispersing mechanism includes a dispersing and spreading disc fixedly connected to the inner side of the wall of the primary coarse material screening pipe. The dispersing and spreading disc is an upwardly convex conical disc. The disc body is provided with several air holes, and several impact blocks are fixedly connected to the top surface of the disc body. The impact blocks are polygonal blocks, with one of their apex angles facing upward.

[0009] As a preferred embodiment of the present invention, the side of the primary coarse material screening tube is provided with a feed hole at a position corresponding to the coarse material feed pipe, and the bottom end of the coarse material feed pipe extends into the interior of the primary coarse material screening tube through the feed hole.

[0010] As a preferred embodiment of the present invention, a secondary coarse material collection hopper is provided at the bottom of the secondary coarse material screening tube, and a corresponding mounting hole is provided through the side of the secondary coarse material collection hopper. The top of the primary coarse material screening tube passes through the mounting hole and is located inside the secondary coarse material screening tube.

[0011] As a preferred embodiment of the present invention, the body of the secondary coarse material screening tube is further provided with a tertiary discharge hole, and the bottom end of the tertiary coarse material collection hopper passes through the tertiary discharge hole and is located outside the secondary coarse material screening tube.

[0012] As a preferred embodiment of the present invention, the wind farm centrifugal mechanism includes a transmission mechanism, a centrifugal shaft, and a centrifugal rotor. The working end of the transmission mechanism is connected to the centrifugal shaft and is used to drive the centrifugal shaft to rotate. The shaft body of the centrifugal shaft is fixedly connected to one side of the centrifugal rotor, and the other side of the centrifugal rotor faces the guide plate.

[0013] As a preferred embodiment of the present invention, a vertical guide pipe is provided at the bottom end of the feed pipe, and a wear-resistant steel plate is attached to the inner side wall of the vertical guide pipe; the receiving surfaces of the primary coarse material collection hopper and the secondary coarse material collection hopper are both provided with wear-resistant steel plates. In summary, the present invention has the following beneficial effects: When applying the present invention, the material is fed from the coarse material feed pipe into the primary coarse material screening pipe. The fed material includes materials of different particle sizes. After entering the primary coarse material screening pipe, the material falls onto the dispersing mechanism under the action of gravity. Some of the fine powder is carried upward by the airflow from the air inlet pipe into the classification zone of the secondary coarse material screening pipe between the material leaving the coarse material feed pipe and falling onto the dispersing and spreading plate. The material that is not carried away by the airflow falls onto the dispersing and spreading plate. After being dispersed and impacted, the large particles will be broken down, producing more fine powder, which will be carried away by the airflow. Finally, the remaining material will fall into the primary coarse material collection hopper through the primary discharge gap and be discharged. At this time, the outlet of the primary discharge collection hopper can be connected to the grinding device for further grinding.

[0014] The material carried by the wind enters the secondary coarse material screening pipe. Since the diameter of the secondary coarse material screening pipe is larger than that of the primary coarse material screening pipe, the airflow speed will suddenly decrease after entering the secondary coarse material screening pipe. As a result, some of the coarse material will lose speed and fall down the pipe wall of the secondary coarse material screening pipe into the secondary discharge gap, and be discharged through the secondary coarse material collection hopper.

[0015] The remaining material continues to be carried upwards by the airflow into the three-stage coarse material screen. Due to the different particle sizes, the material experiences different centrifugal forces in the airflow generated by the centrifugal rotor of the centrifugal mechanism. Larger and heavier particles experience greater centrifugal forces, causing them to be thrown onto the guide plate. Particles that lose speed slide down the side wall of the guide plate into the three-stage coarse material collection hopper and are discharged. Material that is not thrown out by the centrifugal force is then introduced into the fine material discharge pipe under the action of the airflow to obtain the target fine material.

[0016] The advantages of this invention are that the dispersing and grading machine of this invention has a strong dispersing effect, a good grading effect, a regular and compact shape and structure, low system resistance which helps to reduce system power consumption, and convenient process layout which helps to save civil engineering costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the material dispersing and spreading disc of the present invention; Figure 3 This is a schematic diagram of the material guide ring of the present invention; Figure 4 This is a schematic diagram of the guide plate and centrifugal rotor of the present invention.

[0018] In the diagram: 1. Air inlet pipe; 2. Primary coarse material screening pipe; 3. Secondary coarse material screening pipe; 4. Fine material discharge pipe; 5. Primary discharge gap; 6. Secondary discharge gap; 7. Guide plate; 8. Tertiary coarse material collection hopper; 9. Vertical pipe section; 10. Bending pipe section; 11. Slag discharge port; 12. Material guide ring; 13. Conical open ring; 14. Vertical circular ring; 15. Elongated hole; 16. Primary coarse material collection hopper; 17. Dispersing and spreading disc; 18. Ventilation hole; 19. Impact block; 20. Secondary coarse material collection hopper; 21. Transmission mechanism; 22. Centrifugal shaft; 23. Centrifugal rotor; 24. Vertical guide pipe; 25. Coarse material feed pipe. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-3 As shown, the present invention provides a dispersing and classifying machine, comprising an air inlet pipe 1, a coarse material feed pipe 25, a primary coarse material screening pipe 2, a secondary coarse material screening pipe 3, a tertiary coarse material screener, a dispersing mechanism, and a fine material discharge pipe 4; The bottom of the primary coarse material screening pipe 2 is fitted onto the top outside of the air inlet pipe 1; the air inlet pipe 1 is used to introduce a continuous and stable airflow, which drives the material to move.

[0021] Regarding the air intake pipe 1, the air intake pipe 1 includes a vertical pipe section 9 and a bent pipe section 10. The top of the vertical pipe section 9 is equipped with a baffle guide ring 12. The baffle guide ring 12 includes a conical open ring 13 and a vertical circular ring 14. The top of the vertical circular ring 14 is fixedly connected to the bottom of the conical open ring 13, and the bottom of the vertical circular ring 14 is correspondingly connected to the top of the vertical pipe section 9. The conical open ring 13 is an upwardly protruding conical ring with an inclination angle of generally 40-50°. The center of the conical ring is a circular opening. The inner diameter of the top surface of the cone is smaller than the maximum diameter of the bottom of the cone of the dispersing and spreading disc 17. Several long holes 15 along the radial direction are provided through the ring surface. The width of the holes is 15-20mm. The cone is made of wear-resistant composite plate, and the wear-resistant surface is the material-facing surface. The bottom end of the vertical pipe section 9 is connected to the top end of the bent pipe section 10. The bottom of the bent pipe section 10 is provided with a slag discharge port 11 to discharge the material that leaks into the air inlet pipe 1.

[0022] The conical surface of the baffle ring 12 can prevent most large particles from leaking into the air inlet pipe 1, and the opening of the elongated hole 15 can increase the ventilation area, making it easier to achieve the designed ventilation velocity. The lower vertical ring 14 of the baffle ring 12 plays a role in rectifying the direction of material falling, so that the final falling direction of the material is vertically downward, which facilitates the material entering the primary coarse material collection hopper 16 and reduces the leakage of material into the air inlet pipe 1.

[0023] A primary discharge gap 5 is provided between the primary coarse material screening pipe 2 and the air inlet pipe 1. A primary coarse material collection hopper 16 is connected to the bottom of the primary coarse material screening pipe 2. A corresponding mounting hole is provided through the side of the primary coarse material collection hopper 16. The top of the bent pipe section 10 of the air inlet pipe 1 passes through the mounting hole, and the bottom of the bent pipe section 10 is located outside the primary coarse material collection hopper 16.

[0024] The bottom end of the coarse material feed pipe 25 extends obliquely into the body of the primary coarse material screening pipe 2, and the bottom outlet of the coarse material feed pipe 25 is located directly above the air outlet of the air inlet pipe 1. Specifically, the side of the primary coarse material screening pipe 2 has a feed hole corresponding to the position of the coarse material feed pipe 25, and the bottom end of the coarse material feed pipe 25 extends into the interior of the primary coarse material screening pipe 2 through the feed hole. The cross-section of the feed pipe is rectangular, and a vertical guide pipe 24 is provided at the bottom end of the feed pipe. The inner wall of the vertical guide pipe 24 is lined with a wear-resistant steel plate. The width of the feed pipe is sufficient to meet the feed volume and is also close to the diameter of the dispersing and spreading disc 17, so that the dispersing and spreading disc 17 can receive as much falling material as possible.

[0025] A dispersing mechanism is installed between the coarse material feed pipe 25 and the air inlet pipe 1. This mechanism disperses the material leaking from the coarse material feed pipe 25. Specifically, the dispersing mechanism includes a dispersing and spreading disc 17 fixedly connected to the inner wall of the primary coarse material screening pipe 2. The dispersing and spreading disc 17 is an upwardly convex conical disc with an inclination angle typically 40-50°. Several ventilation holes 18 are provided on the disc body, which are not limited to round holes, square holes, or oblong holes 15. Several impact blocks 19 are fixedly connected to the top surface of the disc body. The impact blocks 19 are polygonal blocks, with one apex pointing upwards. A countersunk flange is provided at the bottom of the dispersing and spreading disc 17. The inclined cone shape of the dispersing and spreading disc 17 facilitates material feeding, the openings reduce equipment ventilation resistance, and the more upward-facing sharp edges of the impact blocks 19 allow some material to be crushed upon impact.

[0026] The dispersing mechanism also includes an annular spreading disc support platform. The outer edge of the spreading disc support platform is fixedly installed inside the primary coarse material screening pipe 2, and the top of its inner edge is a flange for connecting with the dispersing spreading disc 17.

[0027] The bottom of the secondary coarse material screening pipe 3 is fitted over the top outside of the primary coarse material screening pipe 2, and a secondary discharge gap 6 is provided between the two. The diameter of the secondary coarse material screening pipe 3 is larger than that of the primary coarse material screening pipe 2, and the secondary coarse material screening pipe 3 is a conical annular pipe with a large top diameter and a small bottom diameter. When the material enters the secondary coarse material screening pipe 3, the airflow will slow down, so that coarse particles within a certain size range in the airflow will fall to the surroundings due to the reduction in wind speed, and then be discharged through the secondary discharge gap 6.

[0028] The bottom of the secondary coarse material screening pipe 3 is equipped with a secondary coarse material collection hopper 20. The side of the secondary coarse material collection hopper 20 has a corresponding mounting hole for the primary coarse material screening pipe 2. The top of the primary coarse material screening pipe 2 passes through the mounting hole and is located inside the secondary coarse material screening pipe 3. Flat steel is welded to the material-facing surface of the bottom plate of the secondary coarse material collection hopper 20 for wear prevention. The inclination angle of the bottom plate is generally 40-50°.

[0029] The tertiary coarse material screener is attached to the top of the secondary coarse material screener tube 3. The tertiary coarse material screener includes a wind farm centrifugal mechanism, a guide plate 7, and a tertiary coarse material collection hopper 8. The wind farm centrifugal mechanism is used to centrifuge and screen materials by generating a dynamic rotating wind field. The guide plate 7 is used to guide the centrifuged material into the tertiary coarse material collection hopper 8. The fine material discharge pipe 4 is attached above the center of the wind farm centrifugal mechanism and is used to receive airflow and materials that have not been centrifuged.

[0030] Specifically, a tertiary discharge hole is also provided through the body of the secondary coarse material screening pipe 3, and the bottom end of the tertiary coarse material collection hopper 8 passes through the tertiary discharge hole and is located outside the secondary coarse material screening pipe 3.

[0031] The centrifugal mechanism of the wind farm includes a transmission mechanism 21, a centrifugal shaft 22, and a centrifugal rotor 23. The working end of the transmission mechanism 21 is connected to the centrifugal shaft 22 and is used to drive the centrifugal shaft 22 to rotate. The shaft of the centrifugal shaft 22 is fixedly connected to one side of the centrifugal rotor 23, and the other side of the centrifugal rotor 23 faces the guide plate 7.

[0032] The annular channel formed between the upper part of the secondary coarse material screening pipe 3 and the tertiary coarse material collection hopper 8 gradually decreases in area from bottom to top. This causes the air velocity to gradually increase from bottom to top, preventing material collapse within the annular channel. Figure 4As shown, the guide plate 7 is presented in the form of a plate assembly, set at an inclined angle on the outside of the centrifugal rotor 23, to catch the material when it is thrown out under centrifugal force. The plate assembly is ring-shaped, surrounding the outside of the centrifugal rotor 23, with gaps between adjacent guide plates 7 to allow material and air to pass through. The angle of the guide plate 7 is adjustable; the gap between the guide plate 7 and the outer diameter of the centrifugal rotor 23 can be adjusted according to the actual production conditions. The centrifugal rotor 23 is a rotor cage composed of several vertical rotor blades 26, with gaps also existing between adjacent rotor blades 26 to allow material and airflow to pass through.

[0033] The centrifugal rotor 23 is driven to rotate via a transmission mechanism 21. The motor drive uses frequency conversion control, and the speed of the centrifugal rotor 23 is adjustable. The motor is connected to a reducer via a coupling. A standard reducer with horizontal input and vertical output completes the direction change. The output shaft of the reducer is connected to the centrifugal shaft 22 via a coupling. The centrifugal shaft 22 and the centrifugal rotor 23 are connected as a whole. The motor drives the reducer to rotate, and the reducer drives the centrifugal shaft 22 and the centrifugal rotor 23 to rotate, generating a wind field.

[0034] By adjusting the air volume, the rotational speed of the centrifugal rotor 23, and the gap between the guide plate 7 and the centrifugal rotor 23, the system's output and quality can be controlled.

[0035] In a preferred embodiment of the present invention, the receiving surfaces of both the primary coarse material collection hopper 16 and the secondary coarse material collection hopper 20 are provided with wear-resistant steel plates.

[0036] In a preferred embodiment of the present invention, an inspection door is provided on the outer pipe or shell of the dispersing and classifying machine to allow access to the rotor area and the interior of the third-stage coarse material collection hopper 8 for maintenance. An inspection door is provided on the side wall of the first-stage coarse material screening pipe 2 to allow maintenance of the dispersing and spreading disc 17. An inspection door is provided on the side wall of the air inlet pipe 1 to allow maintenance of the baffle guide ring 12.

[0037] In a preferred embodiment of the present invention, the dispersing and classifying machine is used in a cement semi-finished grinding system. The materials to be classified include ultra-coarse materials (primary coarse materials), coarse materials (secondary coarse materials), medium coarse materials (tertiary coarse materials), and qualified materials. Ultra-coarse and coarse materials can enter a primary grinding unit for further grinding, which is generally a roller press or a pre-grinding vertical mill. Medium coarse materials enter a secondary grinding unit for further grinding, which is generally a tube mill.

[0038] The application process of this invention is as follows: When applying this invention, the material is fed from the coarse material feed pipe 25 into the primary coarse material screening pipe 2. The fed material includes materials of different particle sizes. After entering the primary coarse material screening pipe 2, the material falls onto the dispersing mechanism under gravity. Some fine powder is carried upward by the airflow from the air inlet pipe 1 into the classification zone of the secondary coarse material screening pipe 3 between the material leaving the coarse material feed pipe 25 and falling onto the dispersing and spreading plate 17. The material that is not carried away by the airflow falls onto the dispersing and spreading plate 17. After being dispersed and impacted, the large particles will be broken down, producing more fine powder, which will be carried away by the airflow. Finally, the remaining material will fall into the primary coarse material collection hopper 16 through the primary discharge gap 5 and be discharged. At this time, the outlet of the primary discharge collection hopper can be connected to the grinding device for further grinding. A very small amount of material will pass through the ventilation holes on the baffle guide ring 12 and fall into the air inlet pipe 1, and finally fall into the slag discharge port 11 and be discharged outside the equipment.

[0039] The material carried by the wind enters the secondary coarse material screening pipe 3. The diameter of the secondary coarse material screening pipe 3 is larger than that of the primary coarse material screening pipe 2, and its diameter gradually increases. After the airflow enters the secondary coarse material screening pipe 3, the wind speed will immediately decrease, and some of the coarse material will lose speed and fall along the pipe wall of the secondary coarse material screening pipe 3 into the secondary discharge gap 6, and be discharged through the secondary coarse material collection hopper 20.

[0040] The remaining material continues to be carried upwards by the airflow into the three-stage coarse material screening range, such as... Figure 4 As shown, a represents the airflow direction containing the material, and b represents the wind direction. The material and airflow enter the centrifugal rotor 23 through the gap between the guide plates 7 and the centrifugal rotor 23 through the gap between the rotor blades 26. Due to the different particle sizes, the centrifugal force experienced by the material in the wind field generated by the rotation of the centrifugal rotor 23 of the wind field centrifugal mechanism is also different. The larger and heavier particles are subjected to greater centrifugal force, causing these particles to be thrown onto the guide plates 7. The particles that lose speed will slide down the side wall of the guide plates 7 into the third-stage coarse material collection hopper 8 and be discharged. The material that is not thrown out by the centrifugal force is then introduced into the fine material discharge pipe 4 under the action of the airflow to obtain the target fine material.

[0041] The advantages of this invention are that the dispersing and grading machine of this invention has a strong dispersing effect, a good grading effect, a regular and compact shape and structure, low system resistance which helps to reduce system power consumption, and convenient process layout which helps to save civil engineering costs.

[0042] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A dispersing and grading machine, characterized in that: include: Air inlet pipe (1), coarse material feed pipe (25), primary coarse material screening pipe (2), secondary coarse material screening pipe (3), tertiary coarse material screener, dispersing mechanism, fine material discharge pipe (4); The bottom of the primary coarse material screening tube (2) is sleeved on the outside of the top of the air inlet tube (1), and a primary discharge gap (5) is provided between the two. The bottom end of the coarse material feed pipe (25) extends obliquely into the body of the first-stage coarse material screening pipe (2). The bottom outlet of the coarse material feed pipe (25) is located directly above the air outlet of the air inlet pipe (1). The air inlet pipe (1) is used to introduce an air source to drive the material upward. The dispersing mechanism is installed between the coarse material feed pipe (25) and the air inlet pipe (1), and the dispersing mechanism is used to disperse the material that leaks from the coarse material feed pipe (25); The bottom of the secondary coarse material screening tube (3) is sleeved on the outside of the top of the primary coarse material screening tube (2), and a secondary discharge gap (6) is provided between the two. The third-stage coarse material screener is attached to the top of the second-stage coarse material screener (3). The third-stage coarse material screener includes a wind field centrifugal mechanism, a guide plate (7), and a third-stage coarse material collection hopper (8). The wind field centrifugal mechanism is used to centrifuge and screen materials by generating a dynamic rotating wind field. The guide plate (7) is used to guide the centrifuged material into the third-stage coarse material collection hopper (8). The fine material discharge pipe (4) is attached above the center of the wind field centrifugal mechanism and is used to receive airflow and materials that have not been centrifuged.

2. The dispersing and grading machine according to claim 1, characterized in that: The air intake pipe (1) includes a vertical pipe section (9) and a bent pipe section (10). The bottom end of the vertical pipe section (9) is connected to the top end of the bent pipe section (10), and a slag discharge port (11) is provided at the bottom of the bent pipe section (10).

3. A dispersing and grading machine according to claim 2, characterized in that: The top of the vertical tube section (9) is provided with a baffle guide ring (12), which includes a conical open ring (13) and a vertical circular ring (14). The top end of the vertical circular ring (14) is fixedly connected to the bottom end of the conical open ring (13), and the bottom end of the vertical circular ring (14) is correspondingly connected to the top of the vertical tube section (9). The conical open ring (13) is a conical ring that protrudes upward. The center of the conical ring is a circular opening, and several elongated holes (15) along the radial direction are provided through the ring surface.

4. A dispersing and grading machine according to claim 3, characterized in that: The bottom of the primary coarse material screening pipe (2) is fitted with a primary coarse material collection hopper (16). The side of the primary coarse material collection hopper (16) is provided with a corresponding mounting hole for the air inlet pipe (1). The top of the bent pipe section (10) of the air inlet pipe (1) passes through the mounting hole, and the bottom of the bent pipe section (10) is located outside the primary coarse material collection hopper (16).

5. A dispersing and grading machine according to claim 4, characterized in that: The dispersing mechanism includes a dispersing and spreading disc (17) fixedly connected to the inner side of the wall of the primary coarse material screening pipe (2). The dispersing and spreading disc (17) is an upwardly convex conical disc. Several air holes (18) are opened on the disc body of the dispersing and spreading disc (17), and several impact blocks (19) are fixedly connected to the top surface of the disc body. The impact block (19) is a polygonal block, and one of its apex points upward.

6. A dispersing and grading machine according to claim 5, characterized in that: The side of the primary coarse material screening tube (2) is provided with a feed hole at a position corresponding to the coarse material feed tube (25), and the bottom end of the coarse material feed tube (25) extends into the interior of the primary coarse material screening tube (2) through the feed hole.

7. A dispersing and grading machine according to claim 6, characterized in that: The bottom of the secondary coarse material screening tube (3) is provided with a secondary coarse material collection hopper (20). The side of the secondary coarse material collection hopper (20) is provided with a corresponding mounting hole for the primary coarse material screening tube (2). The top of the primary coarse material screening tube (2) passes through the mounting hole and is located inside the secondary coarse material screening tube (3).

8. A dispersing and grading machine according to claim 7, characterized in that: The secondary coarse material screening tube (3) is also provided with a tertiary discharge hole through its body. The bottom end of the tertiary coarse material collection hopper (8) passes through the tertiary discharge hole and is located outside the secondary coarse material screening tube (3).

9. A dispersing and grading machine according to claim 8, characterized in that: The centrifugal mechanism of the wind farm includes a transmission mechanism (21), a centrifugal shaft (22), and a centrifugal rotor (23). The working end of the transmission mechanism (21) is connected to the centrifugal shaft (22) and is used to drive the centrifugal shaft (22) to rotate. The shaft of the centrifugal shaft (22) is fixedly connected to one side of the centrifugal rotor (23), and the other side of the centrifugal rotor (23) faces the guide plate (7).

10. A dispersing and grading machine according to claim 9, characterized in that: The bottom end of the feed pipe is provided with a vertical guide pipe (24), and the inner wall of the vertical guide pipe (24) is lined with a wear-resistant steel plate; the material receiving surfaces of the primary coarse material collection hopper (16) and the secondary coarse material collection hopper (20) are both provided with wear-resistant steel plates.

Images