High-strength crushing tooth roller crushing equipment and crushing process

Abstract

The invention discloses high-strength crushing tooth roller crushing equipment and a crushing process, and relates to the technical field of ore crushing. Comprising a motor; a deceleration system; the output end of the motor is provided with a hydraulic coupler and is connected with the speed reduction system; the connection synchronization system is connected with the speed reduction frame; at least two groups of paired roller shafts are mounted in the main rack, and roller teeth are arranged on the roller shafts; a side tooth crushing part is mounted in the main rack, and a bottom tooth crushing part is mounted at the bottom; the side tooth crushing part comprises a side comb plate and a mounting plate, side teeth are arranged on the side comb plate, the side comb plate is mounted on the mounting plate, and the mounting plate is mounted on the main rack; the bottom tooth crushing part comprises two groups of bevel edge plates and a bottom part, and the bevel edge plates are obliquely mounted on the bottom part; bottom teeth are arranged on the sides, facing the roller shafts, of the bevel edge plates. Wear-resisting plates are installed on the four walls of the inner side of the main machine frame. The technical problems of low yield and low efficiency caused by the fact that a three-section open-circuit crushing process needs a large number of crushing equipment are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ore crushing, and specifically to a high-strength crushing tooth roll crushing device and a crushing process method. Background Art

[0002] Currently, the mainstream crushing processes in the ore crushing industry are the three-stage one-closed-circuit and three-stage open-circuit crushing processes. As seen in the flowchart of the specific crushing process, the three-stage one-closed-circuit crushing process flow is complex, and in the fine crushing stage, it is also necessary to screen and select qualified products. Unqualified products need to be transported into the fine crushing equipment for secondary crushing, resulting in waste of resources. Moreover, due to the excessive number of equipment, it will cause excessive investment and troublesome subsequent maintenance, thus increasing the production cost of the ore and affecting the economic benefits. The three-stage open-circuit crushing process: It is the most widely used and highly versatile crushing process in the ore crushing industry. Specifically, different ore crushing equipment is selected to perform three-stage open crushing on the original ore, namely coarse crushing, medium crushing, and fine crushing. Figure 1

[0003] Compared with the three-stage one-closed-circuit crushing process, the three-stage open-circuit crushing process will cause the product particle size to be too coarse, and the crushing strength is relatively small. Limited by the strength of the rod mill, the output is relatively low.

[0004] Therefore, the present invention designs a new crushing process and crushing equipment to solve the disadvantages of the three-stage open-circuit crushing. Summary of the Invention

[0005] The purpose of the present invention is to make up for the deficiencies of the existing technology, and provide a high-strength crushing tooth roll crushing device and a crushing process method to solve the technical problems of the three-stage open-circuit crushing process, such as the need for a large number of crushing equipment, resulting in low output and low efficiency.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] The high-strength crushing tooth roll crushing device includes:

[0008] A motor;

[0009] A deceleration system, the deceleration system includes a deceleration frame; a hydraulic coupler is installed at the output end of the motor and is connected to the deceleration system;

[0010] A connection synchronization system, the connection synchronization system is connected to the deceleration frame;

[0011] A main frame, at least two pairs of roll shafts are installed in the main frame, and roll teeth are provided on the roll shafts; a side tooth crushing member is installed in the main frame, and a bottom tooth crushing member is installed at the bottom;

[0012] ​The edge tooth crusher includes a side comb plate and a mounting plate. Side teeth are provided on the side comb plate, the side comb plate is mounted on the mounting plate, and the mounting plate is mounted on the main frame;

[0013] The bottom tooth crusher includes two groups of inclined side plates and a bottom member. The inclined side plates are inclinedly mounted on the bottom member; on the side of the inclined side plate facing the roller shaft, bottom teeth are provided;

[0014] Wear-resistant plates are installed on the inner four walls of the main frame.

[0015] Connecting synchronization system: It refers to a device that synchronizes the rotation of the rollers by gears. Its transmission ratio is accurate, the efficiency is high, the structure is compact, the work is reliable, and the service life is long

[0016] Roll tooth crushing system: It consists of two rollers that rotate inward simultaneously and the roll teeth on their surfaces obtained through the shear crushing mechanism. It has a large feeding volume, a high crushing ratio, a high crushing strength, high efficiency, a compact structure, reliable work, and a long service life.

[0017] In a further technical solution, two groups of roller shafts are provided, and rear baffles and front baffles are installed at the front and rear ends of the two groups of roller shafts;

[0018] Multiple groups of roll teeth are provided, and multiple roll teeth are circumferentially arranged along the axis of the corresponding roller shaft in each group;

[0019] Multiple side teeth are provided on the side comb plate, and a group of roll teeth are provided between adjacent side teeth.

[0020] In a further technical solution, the main frame includes an upper frame and a lower frame, and a transverse plate and a vertical plate are provided on the side for separation;

[0021] The mounting plate is installed on the vertical plate, and a transverse adjusting member is installed on the mounting plate. The transverse adjusting member is suitable for adjusting the distance between the side comb plate and the roll teeth.

[0022] In a further technical solution, the transverse adjusting member includes a positioning bolt, and the positioning bolt is installed between the mounting plate and the side comb plate; a backing plate is installed on the positioning bolt on the side of the mounting plate facing away from the crushing tooth plate; a locknut is installed on the positioning bolt; a thickening pad is installed between the locknut and the backing plate.

[0023] In a further technical solution, the bottom member includes a bottom plate, and the bottom plate is fixedly connected to the inclined side plate.

[0024] In a further technical solution, the ends of the two groups of inclined side plates away from each other are hinged to the bottom box;

[0025] The bottom member includes a bottom box, and a vertical adjusting member is installed in the bottom box;

[0026] The vertical adjusting member includes a vertical rod, on which a side plate and a plug-in plate are respectively installed. The top of the side plate is detachably connected to the bevel plate; the bottom of the side plate is detachably connected to the plug-in plate.

[0027] In a further technical solution, the middle part of the upper side of the plug-in plate protrudes upward, and the middle part of the bottom side is recessed upward; multiple groups of plug-in plates are installed in the bottom box, and a vertical rod is installed in the middle and connected to the main frame.

[0028] In a further technical solution, the height of the side plate is higher than the protruding height of the bottom plug-in plate, and a dust-proof plate is installed. The side of the dust-proof plate is fixedly connected to the side plate.

[0029] A high-strength ore crushing process includes the following steps:

[0030] Step 1, coarse crushing: The raw ore with a particle size of ≤1000 mm is transported and unloaded into a gyratory crusher. The ore trough 1 at the lower part of the gyratory crusher breaks it to form a coarse crushing product, and the coarse crushing product is transported to the ore trough 1; among them, the discharge particle size of the gyratory crusher is ≤350 mm;

[0031] Step 2, medium crushing: The coarse crushing product is fed into the high-strength crushing tooth roller crushing equipment of claim 3 through a conveyor belt for medium crushing to obtain a medium crushing product;

[0032] The discharge particle size of the high-strength crushing tooth roller crushing equipment is ≤75 mm; the medium crushing product is fed into a fixed bar screen through a conveyor belt, and the qualified medium crushing product is transported to the ore trough 2 through a conveyor belt;

[0033] Step 3, the horizontal adjusting member and the vertical adjusting member work to reduce the gap with the roller teeth;

[0034] Step 4, fine crushing: The fine crushing passes the medium crushing product through the high-strength crushing tooth roller crushing equipment with the spacing adjusted again, and the discharge opening is 5 - 8 mm; the fine crushing discharge enters a fixed screen to screen out qualified blanking products;

[0035] The unqualified products are returned to the high-strength crushing tooth roller crushing equipment for fine crushing to form a closed circuit, and the qualified products are transported to grinding by a conveyor belt.

[0036] Compared with the prior art, the following beneficial effects are achieved:

[0037] The technical solution of the present invention saves energy and reduces consumption, has a simple structure and is convenient for maintenance. Fewer equipment are selected, reducing the required number of equipment and the required site construction for the equipment. By adjusting the axle distance between the tooth rollers and changing the size and number of the crushing teeth, the output particle size of the crushed ore is adjusted. The low rotation speed of this equipment can provide high torque and cooperate with the crushing teeth to crush higher-strength raw ore. Therefore, screening equipment is not required, reducing the input of crushed ore and the energy consumption of the equipment.

[0038] The side comb plate has bolt holes on the tooth surface and is matched with a bolt and a gasket at the bottom to adjust the length of the side teeth so as to adjust the particle size of the discharged material. When the side comb plate is severely worn or the side teeth need to be adjusted, the whole mounting plate can be pulled out from the rabbet, and the rabbet is at the middle position where the mounting plate is installed in the main frame; after unscrewing the positioning bolt of the side comb plate behind the mounting plate, the side comb plate can be taken out. The mounting plate is fixedly connected to the main frame through bolts, enabling the side comb plate to be reliably connected to the main frame and facilitating disassembly and assembly, and the material of the side comb plate can be reused.

[0039] The present invention uses fixed and stacked plug-in plates to achieve thickening support, and the inclined side angle is ensured by the side plates that can be detachably installed at the top, ensuring the meshing clearance between the roller teeth and the bottom teeth, and maintaining the technical effect that qualified ore can be stably crushed and discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a top view structural schematic diagram of the high-strength ore crushing equipment of the present invention;

[0041] Figure 2 is a three-dimensional structural schematic diagram of the high-strength ore crushing equipment of the present invention;

[0042] Figure 3 is a sectional view structural schematic diagram of two groups of roller shafts in the main frame of the present invention;

[0043] Figure 4 is a schematic diagram of the rotation of two groups of roller shafts of the present invention;

[0044] Figure 5 is a structural schematic diagram of the main frame in Embodiment 2 of the present invention;

[0045] Figure 6 is a sectional view schematic diagram of the main frame in Embodiment 2 of the present invention;

[0046] Figure 7 For the present invention Figure 2 is a sectional view connection schematic diagram of the side comb plate and the roller shaft;

[0047] Figure 8 is Figure 7 an enlarged schematic diagram at A;

[0048] Figure 9 is a sectional view structural schematic diagram of the main frame in Embodiment 3 of the present invention;

[0049] Figure 10 is Figure 9 an enlarged view of part B;

[0050] Figure 11 is a schematic diagram of the crushing process of the present invention.

[0051] In the figure:

[0052] 1. Motor; 2. Fluid coupling; 3. Reduction system; 4. Connection synchronization system; 5. Rear baffle; 6. Roller shaft; 7. Upper frame; 8. Front baffle; 9. Wear-resistant plate; 10. Side teeth; 11. Roller teeth; 12. Lower frame; 13. Bottom component; 14. Bottom teeth;

[0053] 15. Main frame; 16. Side comb plate; 17. Mounting plate; 18. Hypotenuse plate; 19. Horizontal plate; 20. Vertical plate; 21. Positioning bolt; 22. Anti-loosening nut; 23. Pad; 24. Thickening pad; 131. Bottom box; 132. Vertical rod; 133. Side plate; 134. Plug-in plate; 135. Dust-proof plate; Detailed implementation mode

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0055] Embodiment 1

[0056] Please refer to Figures 1-4 As shown, it is a technical solution of the present invention, specifically including: a high-strength crushing tooth roller crushing device, including: a motor 1;

[0057] A reduction system 3, the reduction system 3 includes a reduction frame; a fluid coupling 2 is installed at the output end of the motor 1 and is connected to the reduction system 3; a speed reducer is installed in the reduction frame to achieve motor speed reduction and steering.

[0058] A connection synchronization system 4, the connection synchronization system 4 is connected to the reduction frame;

[0059] A main frame 15, at least two pairs of roller shafts 6 are installed in the main frame 15, and roller teeth 11 are provided on the roller shafts 6; a side tooth crushing member is installed in the main frame 15, and a bottom tooth crushing member is installed at the bottom;

[0060] The side tooth crushing member includes a side comb plate 16 and a mounting plate 17, side teeth 10 are provided on the side comb plate 16, the side comb plate 16 is installed on the mounting plate 17, and the mounting plate 17 is installed on the main frame 15;

[0061] The bottom tooth crushing member includes two groups of hypotenuse plates 18 and a bottom component 13, the hypotenuse plates 18 are inclined and installed on the bottom component 13; a bottom tooth 14 is provided on the side of the hypotenuse plate 18 facing the roller shaft 6;

[0062] Wear-resistant plates 9 are installed on the inner four walls of the main frame 15.

[0063] like Figure 2 As shown, two groups of roller shafts 6 are provided, and rear baffles 5 and front baffles 8 are installed at the front and rear ends of the two groups of roller shafts 6; multiple groups of roller teeth 11 are provided, and each group is provided with multiple teeth along the circumferential direction of the axis of the corresponding roller shaft 6;

[0064] A plurality of side teeth 10 are provided on the side comb plate 16 , and a group of roller teeth 11 passes between adjacent side teeth 10 .

[0065] The motor 1 is powered and directly connected to the hydraulic coupling 2 to drive the reduction system 3 to rotate, and is connected to the two roller shafts 6 through the connection synchronization system 4, driving the roller teeth to rotate inwards. Figure 4 As shown. The material falls onto the roller tooth system from above, and moves along the rotation direction of the two rollers. Under the bite of the high-strength crushing teeth, the material will be rolled into the middle of the two roller teeth for crushing. When the material is needle-shaped, it will quickly pass through the gap between the two rollers and be stuck by the bevel plate. Then, the material is crushed into the required particle size through the bite between the roller teeth and the bottom teeth on the bevel plate, and enters the ball mill for the next process.

[0066] The main implementation steps are as follows: start the motor 1 and drive the roller shaft 6 to rotate through the hydraulic coupling 2. At this time, the material with a compressive strength of 320MPA falls from above onto the roller teeth. The roller teeth 11 will calculate the relative roller tooth bite angle and can crush the material particle size from 400-50mm. The output material particle size is 70-0mm.

[0067] Example 2

[0068] like Figures 5-8 As shown in Figure 11, another embodiment of the present invention is provided, based on Example 1, in order to achieve the adjustment of the side teeth. The main frame 15 includes an upper frame 7 and a lower frame 12, and the sides are provided with a transverse plate 19 and a vertical plate 20 for separation; a mounting plate 17 is mounted on the vertical plate 20, and a transverse adjustment member is mounted on the mounting plate 17, and the transverse adjustment member is suitable for adjusting the spacing between the side comb plate 16 and the roller teeth 11.

[0069] like Figure 7 As shown, the lateral adjustment member includes a positioning bolt 21, which is installed between the mounting plate 17 and the side comb plate 16; a pad 23 is installed on the positioning bolt 21 on the side of the mounting plate 17 facing away from the crushing tooth plate; an anti-slip nut 22 is installed on the positioning bolt 21; and a thickening pad 24 is installed between the anti-slip nut 22 and the pad 23.

[0070] The side comb plate has bolt holes on its tooth surface and is bolted to a gasket at the bottom. By adjusting the length of the side teeth, the particle size of the discharged material can be adjusted. When the side comb plate is severely worn or the side teeth need to be adjusted, the entire mounting plate can be pulled out from the rabbet. The rabbet is located at the middle position where the mounting plate is installed inside the main frame. After loosening the positioning bolts of the side comb plate behind the mounting plate, the side comb plate can be removed. The mounting plate is fixedly connected to the main frame by bolts, enabling the side comb plate to be reliably connected to the main frame while being convenient for disassembly and assembly, and the material of the side comb plate can be reused.

[0071] As Figure 6 shown, the bottom member 13 includes a bottom plate, and the bottom plate is fixedly connected to the inclined side plate 18.

[0072] As Figure 11 shown, a high-strength ore crushing process includes the following steps:

[0073] Step 1, coarse crushing: The raw ore with a particle size of ≤ 1000 mm is transported and unloaded into a gyratory crusher. The ore trough 1 below the gyratory crusher breaks it to form coarse crushing products, and the coarse crushing products are conveyed to the ore trough 1. Among them, the discharge particle size of the gyratory crusher is ≤ 350 mm;

[0074] Step 2, medium crushing: The coarse crushing products are fed into the high-strength crushing tooth roll crushing equipment of claim 3 for medium crushing through a conveyor belt to obtain medium crushing products;

[0075] The discharge particle size of the high-strength crushing tooth roll crushing equipment is ≤ 75 mm; The medium crushing products are fed into a fixed bar screen through a conveyor belt, and the qualified medium crushing products are conveyed to the ore trough 2 through a conveyor belt;

[0076] Step 3, the horizontal adjusting member and the vertical adjusting member work to reduce the gap with the roller teeth 11;

[0077] Step 4, fine crushing: The medium crushing products are again passed through the high-strength crushing tooth roll crushing equipment with the adjusted gap, and the discharge opening is 5 - 8 mm; The fine crushing discharge enters a fixed screen to screen out qualified discharged products;

[0078] The unqualified products are returned to the high-strength crushing tooth roll crushing equipment for fine crushing to form a closed circuit, and the qualified products are transported to grinding by a conveyor belt. The conveyor belts of each part are realized by belt conveyors. The specific numerical value for reducing the gap in step 3 needs to be adjusted according to the required diameter of the actual ore.

[0079] Example 3

[0080] As Figure 9 and 10As shown, this is another embodiment of the present invention. On the basis of Embodiment 2, a rotatable bevel plate is provided. The ends of the two groups of bevel plates 18 away from each other are hinged to the bottom box 131; there is a gap between the bevel plates or they are in a comb-like cross arrangement, and the hinge is retained to prevent collision and limit.

[0081] The bottom member 13 includes a bottom box 131, and a vertical adjusting member is installed inside the bottom box 131;

[0082] The vertical adjusting member includes a vertical rod 132. A side plate 133 and a plug-in plate 134 are respectively installed on the vertical rod 132. The top of the side plate 133 is detachably connected to the bevel plate 18; the bottom of the side plate 133 is detachably connected to the plug-in plate 134.

[0083] The middle part of the upper side of the plug-in plate 134 bulges upward, and the middle part of the bottom side sinks upward; multiple groups of plug-in plates 134 are installed inside the bottom box 131, and a vertical rod 132 is installed in the middle and connected to the main frame 15.

[0084] As Figure 10 shown, the height of the side plate 133 is higher than the protruding height of the bottom plug-in plate 134, and a dust-proof plate 135 is installed. The side of the dust-proof plate 135 is fixedly connected to the side plate 133. In this embodiment, fixed stacked plug-in plates are used to achieve thickening and support, and the bevel angle is ensured by detachably installing the side plate at the top, ensuring the meshing gap between the roller teeth and the bottom teeth, and maintaining the technical effect that qualified ore can be stably crushed and discharged.

[0085] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0086] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. High-strength crushing tooth roller crushing equipment, characterized in that: include: Motor (1); A reduction system (3), the reduction system (3) comprising a reduction frame; a hydraulic coupler (2) is installed at the output end of the motor (1) and is connected to the reduction system (3); Connecting the synchronous system (4), connecting the synchronous system (4) to the reduction frame; A main frame (15), wherein at least two groups of paired roller shafts (6) are installed in the main frame (15), and roller teeth (11) are arranged on the roller shafts (6); a side tooth crushing member is installed in the main frame (15), and a bottom tooth crushing member is installed at the bottom; The side tooth crushing member comprises a side comb plate (16) and a mounting plate (17), the side comb plate (16) is provided with side teeth (10), the side comb plate (16) is mounted on the mounting plate (17), and the mounting plate (17) is mounted on the main frame (15); The bottom tooth crushing member comprises two groups of bevel plates (18) and a bottom member (13), wherein the bevel plates (18) are obliquely mounted on the bottom member (13); a bottom tooth (14) is arranged on one side of the bevel plates (18) facing the roller shaft (6); Wear-resistant plates (9) are installed on the four inner walls of the main frame (15).

2. A high-strength crushing tooth roller crushing equipment according to claim 1, characterized in that: Two groups of roller shafts (6) are provided, and rear baffles (5) and front baffles (8) are installed at the front and rear ends of the two groups of roller shafts (6); The roller teeth (11) are provided in a plurality of groups, and each group is provided with a plurality of teeth along the circumference of the axis of the corresponding roller shaft (6); A plurality of side teeth (10) are provided on the side comb plate (16), and a group of roller teeth (11) passes between adjacent side teeth (10).

3. A high-strength crushing tooth roller crushing equipment according to claim 1, characterized in that: The main frame (15) comprises an upper frame (7) and a lower frame (12), and is separated by a transverse plate (19) and a vertical plate (20) on the side; A mounting plate (17) is mounted on the vertical plate (20), and a transverse adjustment member is mounted on the mounting plate (17), wherein the transverse adjustment member is suitable for adjusting the spacing between the side comb plate (16) and the roller teeth (11).

4. A high-strength crushing tooth roller crushing equipment according to claim 3, characterized in that: The transverse adjustment member comprises a positioning bolt (21), wherein the positioning bolt (21) is installed between the mounting plate (17) and the side comb plate (16); a pad (23) is installed on the positioning bolt (21) on the side of the mounting plate (17) facing away from the crushing tooth plate; an anti-slip nut (22) is installed on the positioning bolt (21); and a thickening pad (24) is installed between the anti-slip nut (22) and the pad (23).

5. A high-strength crushing tooth roller crushing equipment according to claim 3, characterized in that: The bottom component (13) comprises a bottom plate, and the bottom plate is fixedly connected to the bevel plate (18).

6. A high-strength crushing tooth roller crushing equipment according to claim 3, characterized in that: The ends of the two groups of bevel plates (18) that are away from each other are hinged to the bottom box (131); The bottom member (13) comprises a bottom box (131), and a vertical adjustment member is installed in the bottom box (131); The vertical adjustment member comprises a vertical rod (132), on which a side plate (133) and a plug-in plate (134) are respectively mounted, wherein the top of the side plate (133) is detachably connected to the oblique plate (18); and the bottom of the side plate (133) is detachably connected to the plug-in plate (134).

7. A high-strength crushing tooth roller crushing equipment according to claim 6, characterized in that: The middle part of the upper side of the plug board (134) is upwardly protruding, and the middle part of the bottom side is upwardly concave; multiple groups of plug boards (134) are installed in the bottom box (131), and a vertical rod (132) is installed in the middle and connected to the main frame (15).

8. A high-strength crushing tooth roller crushing equipment according to claim 6, characterized in that: The height of the side plate (133) is higher than the protruding height of the bottom plug-in plate (134), and a dust shield (135) is installed, and the side of the dust shield (135) is fixedly connected to the side plate (133).

9. A high-intensity ore crushing process, characterized in that: The following steps are involved: Step 1, coarse crushing: transport the raw ore with a particle size of ≤1000mm to the gyratory crusher, and crush it into coarse crushed products in the ore trough 1 at the bottom of the gyratory crusher. The coarse crushed products are transported to the ore trough 1; wherein the discharge particle size of the gyratory crusher is ≤350mm; Step 2, secondary crushing: the coarsely crushed products are fed into the ore through a conveyor belt and enter the high-strength crushing tooth roller crushing equipment of claim 3 for secondary crushing to obtain secondary crushed products; The discharge particle size of the high-strength crushing roller crushing equipment is ≤75mm; the medium-crushed products are fed into the fixed bar screen through the conveyor belt, and the qualified medium-crushed products are conveyed to the second ore trough through the conveyor belt; Step 3, the lateral adjustment member and the vertical adjustment member work to reduce the gap with the roller teeth (11); Step 4, fine crushing: Fine crushing: The medium crushed product passes through the high-strength crushing tooth roller crushing equipment with adjusted spacing again, and the discharge opening is 5-8mm; the fine crushing discharge enters the fixed screen to screen qualified unloading products; The unqualified products are returned to the high-strength crushing roller crushing equipment for fine crushing to form a closed circuit, and the qualified products are transported to the grinding mill by the conveyor belt.

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