A granite sand and gravel processing and classification system

Abstract

The present invention is a granite sand and gravel processing and classification system, which includes a first screening workshop, a second screening workshop and a screening and washing workshop; the first screening workshop consists of a vibrating feeder, a jaw crusher, a semi-finished product stockpile, a first circular vibrating screen, a regulating silo, and a cone crusher to form a granite sand and gravel circulating crushing path; the second screening workshop consists of a sand making regulating silo, a vertical shaft crusher and a second circular vibrating screen to form a granite sand and gravel secondary crushing and screening path; the screening and washing workshop consists of a third circular vibrating screen and a washing water pipe to form a granite sand and gravel washing and classification path. Through the present invention, granite sand and gravel can be crushed, and at the same time, it can be classified into large stone piles, medium stone piles, small stone piles, pea gravel piles, rolled sand piles and normal sand piles according to the diameter of the sand and gravel. In addition, the present invention effectively solves various aggregate production tasks, the production process is flexible and changeable, and it can carry out multi-condition production according to the index requirements of the aggregates, ensuring the double compliance of the quality and output of the finished aggregates.

Description

Technical Field

[0001] The present invention relates to the technical field of sand and gravel processing, and particularly relates to a granite sand and gravel processing and classification system. Background Art

[0002] Granite belongs to intrusive rocks among acidic (SiO2>66%) magmatic rocks. The uses of granite can be classified according to the diameter of sand and gravel: those with small diameters can be polished or carved and used as decorative plates or artworks; those with medium diameters are commonly used for building bridge piers, bridge arches, dams, harbors, plinths, foundations, road surfaces, etc.; those with larger crystal grains are excellent aggregates for concrete.

[0003] When preparing concrete aggregates from granite, usually, the granite is first crushed, and then the crushed granite sand and gravel are screened by manually cooperating with different sieves to screen out large stones of 40-80 mm, medium stones of 20-40 mm, small stones of 5-20 mm, pea gravel of 5-10 mm, rolled sand piles of 0-5 mm, and normal sand piles of 0-5 mm. The screening process is time-consuming and requires a large amount of labor. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of granite sand and gravel crushing and screening, and provide a granite sand and gravel processing and classification system.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A granite sand and gravel processing and classification system, which includes a first screening workshop, a second screening workshop, and a screening and washing workshop; the first screening workshop consists of a vibrating feeder, a jaw crusher, a semi-finished product stockpile, a first circular vibrating screen, an adjusting silo, and a cone crusher in sequence to form a granite sand and gravel circulating crushing path. Each device is connected by several belt conveyors, and the screened medium and small diameter sand and gravel are transported to the second screening workshop through the belt conveyor; the second screening workshop consists of a sand making adjusting stockpile, a vertical shaft crusher, and a second circular vibrating screen to form a granite sand and gravel secondary crushing and screening path. Each device is connected by several belt conveyors, and the medium and small diameter sand and gravel after secondary crushing and screening are transported to the screening and washing workshop through the belt conveyor; the screening and washing workshop consists of a third circular vibrating screen and a washing water pipe to form a granite sand and gravel washing and classification path. Each device is connected by several belt conveyors, and the washed and screened medium and small diameter sand and gravel are transported to the medium stone pile, the small stone pile, and the pea gravel pile; the screen aperture of the first circular vibrating screen is larger than that of the second circular vibrating screen, and the screen aperture of the second circular vibrating screen is larger than that of the third circular vibrating screen.

[0007] Preferably, the top of the vibrating feeder of the first screening workshop is open to receive sand and gravel, and a jaw crusher is provided below one side thereof, and a first belt conveyor is provided below the jaw crusher. One end of the first belt conveyor is located below the jaw crusher, and the other end is located below the vibrating feeder. The first belt conveyor can transport sand and gravel to the semi-finished product pile, and a second belt conveyor is provided on one side of the semi-finished product pile. The second belt conveyor can transport sand and gravel to the first circular vibrating screen. The first circular vibrating screen is two groups of circular vibrating screens with three layers of 20mm, 40mm and 80mm screens, and a discharge port is provided at the bottom, and a sixth belt conveyor is provided below the discharge port. A fifth belt conveyor and a seventh belt conveyor are provided below one side of the 80mm screen, a fourth belt conveyor is provided below one side of the 40mm screen, and a third belt conveyor is provided below one side of the 20mm screen. A cone crusher is provided on one side of the adjustment hopper, and the discharge port of the cone crusher is located above the second belt conveyor.

[0008] Preferably, a ninth belt conveyor is provided above the sand making and adjusting material pile of the second screening workshop, a tenth belt conveyor is provided on one side of the sand making and adjusting material pile, an eleventh belt conveyor and a twelfth belt conveyor are provided below the two groups of vertical shaft crushers respectively, the second circular vibrating screen is four groups of circular vibrating screens with three layers of 5mm, 10mm and 30mm screens, and a discharge port is provided at the bottom, a thirteenth belt conveyor is provided below the discharge port, one side of the 30mm screen is located above the sixth belt conveyor, and a fourteenth belt conveyor is provided below one side of the 5mm and 10mm screens.

[0009] Preferably, an eighteenth belt conveyor is provided below the thirteenth belt conveyor, and the eighteenth belt conveyor is a reversible belt conveyor. A nineteenth belt and a sand washing machine are provided below one side of the eighteenth belt conveyor, and a twentieth belt conveyor is provided below the sand washing machine, and the twentieth belt conveyor is a reversible belt conveyor.

[0010] Preferably, a flushing water pipe is provided above the third circular vibrating screen in the screening and flushing workshop, the third circular vibrating screen is provided with three layers of 1mm, 10mm and 20mm screens, and a discharge port is provided at the bottom, the discharge port is connected to the sewage pipe, a fifteenth belt conveyor is provided below one side of the 20mm screen, a sixteenth belt conveyor is provided below one side of the 10mm screen, and a seventeenth belt conveyor is provided below one side of the 1mm screen.

[0011] Preferably, an eighth tape machine is provided below the fourth tape machine, and the eighth tape machine is a reversible tape machine.

[0012] Preferably, one side of the 20mm screen of the first circular vibrating screen is also connected to the sixth belt conveyor through a plug-in type shuttle slot; one side of the 30mm screen of the second circular vibrating screen is also connected to the fourteenth belt conveyor through a plug-in type shuttle slot, and one side of the 10mm and 50mm screens are also connected to the sixth belt conveyor through a plug-in type shuttle slot respectively; one side of the 1mm screen of the third circular vibrating screen is also connected to the sixteenth belt conveyor through a plug-in type shuttle slot; the third belt conveyor is also connected to the eighth belt conveyor through a plug-in type shuttle slot.

[0013] Preferably, a magnetic separator is provided above the first belt conveyor.

[0014] Preferably, the semi-finished product stockpile, the regulating bin, and the sand-making regulating stockpile in the first screening workshop are all box structures with openings at the top and one side, and motor vibrating feeders are respectively provided at the bottoms of the semi-finished product stockpile, the regulating bin, and the sand-making regulating stockpile.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention can crush granite sand and gravel, and at the same time classify it into large stone piles, medium stone piles, small stone piles, pea gravel piles, rolled sand piles, and normal sand piles according to the diameter of the sand and gravel.

[0017] 2. The present invention can effectively control the quality of the finished granite sand and gravel aggregate. By adjusting the production process, various aggregates with required diameters can be produced simultaneously.

[0018] 3. The present invention has been verified to have high production efficiency and reliability, and can also avoid cost increase caused by unreasonable design and planning.

[0019] 4. The present invention effectively solves various aggregate production tasks. The production process is flexible and changeable, and can carry out multi-condition production according to the index requirements of the aggregates, ensuring the double compliance of the quality and output of the finished aggregates. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the present invention after adding an inserted plate shuttle chute.

[0022] Figure 1— In Figure 2, 1 is the first screening workshop, 2 is the second screening workshop, 3 is the screening and washing workshop, 4 is the vibrating feeder, 5 is the jaw crusher, 6 is the semi-finished product stockpile, 7 is the first circular vibrating screen, 8 is the regulating bin, 9 is the cone crusher, 10 is the sand making regulating stockpile, 11 is the vertical shaft crusher, 12 is the second circular vibrating screen, 13 is the third circular vibrating screen, 14 is the washing water pipe, 15 is the large stone stockpile, 16 is the medium stone stockpile, 17 is the small stone stockpile, 18 is the pea gravel stockpile, 19 is the normal sand stockpile, 20 is the rolled sand stockpile, 21 is the sand washer, 22 is the iron remover, 23 is the motor vibrating feeder, 24 is the first belt conveyor, 25 is the second belt conveyor, 26 is the third belt conveyor, 27 is the fourth belt conveyor, 28 is the fifth belt conveyor, 29 is the sixth belt conveyor, 30 is the seventh belt conveyor, 31 is the eighth belt conveyor, 32 is the ninth belt conveyor, 33 is the tenth belt conveyor, 34 is the eleventh belt conveyor, 35 is the twelfth belt conveyor, 36 is the thirteenth belt conveyor, 37 is the fourteenth belt conveyor, 38 is the fifteenth belt conveyor, 39 is the sixteenth belt conveyor, 40 is the seventeenth belt conveyor, 41 is the eighteenth belt conveyor, 42 is the nineteenth belt conveyor, 43 is the twentieth belt conveyor. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of 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.

[0024] The present invention is a granite sand and gravel processing and classification system, including a first screening workshop 1, a second screening workshop 2 and a screening and washing workshop 3. The first screening workshop 1 consists of a vibrating feeder 4, a jaw crusher 5, a semi-finished product stockpile 6, a first circular vibrating screen 7, a regulating bin 8, and a cone crusher 9 arranged in sequence to form a granite sand and gravel circulating crushing path. Each device is connected by a number of belt conveyors, and the screened medium and small diameter sand and gravel are transported to the second screening workshop 2 through the belt conveyors. The second screening workshop 2 consists of a sand making regulating stockpile 10, a vertical shaft crusher 11 and a second circular vibrating screen 12 to form a granite sand and gravel secondary crushing and screening path. Each device is connected by a number of belt conveyors, and the medium and small diameter sand and gravel after secondary crushing and screening are transported to the washing workshop through the belt conveyors. The screening and washing workshop 3 consists of a third circular vibrating screen 13 and a washing water pipe 14 to form a granite sand and gravel washing and classification path. Each device is connected by a number of belt conveyors, and the washed and screened medium and small diameter sand and gravel are transported to the medium stone stockpile 16, the small stone stockpile 17 and the pea gravel stockpile 18. The screen aperture of the first circular vibrating screen 7 is larger than that of the second circular vibrating screen 12, and the screen aperture of the second circular vibrating screen 12 is larger than that of the third circular vibrating screen 13.

[0025] As Figure 1 shown, the material flow of the granite sand and gravel processing and classification system is as indicated by the arrows. The vibrating feeder 4 at the top of the first screening workshop 1 has an open top for receiving sand and gravel transported by a tipping truck. Below one side of the feeder is a jaw crusher 5, and below the jaw crusher 5 is a first belt conveyor 24. One end of the first belt conveyor 24 is located below the jaw crusher 5, and the other end is located below the vibrating feeder 4. Sand and gravel with a size of <150 mm directly fall onto the first belt conveyor 24, and sand and gravel with a size of ≥150 mm fall onto the first belt conveyor 24 after being crushed by the jaw crusher 5. The first belt conveyor 24 can convey the sand and gravel to the semi-finished material pile 6. An electromagnetic separator 22 can also be added above the first belt conveyor 24 to remove ferromagnetic impurities mixed in the sand and gravel. The diameter of the sand and gravel stacked in the semi-finished material pile 6 is 0 - 150 mm. On one side of the semi-finished material pile 6 is a second belt conveyor 25. Workers dial the sand and gravel in the semi-finished material pile 6 onto the second belt conveyor 25, and the second belt conveyor 25 can convey the sand and gravel to the first circular vibrating screen 7. The first circular vibrating screen 7 is a circular vibrating screen with three layers of screen meshes of 20 mm, 40 mm, and 80 mm in two groups, and there is a discharge port at the bottom. Below the discharge port is a sixth belt conveyor 29, and the sand and gravel with a size of <20 mm are conveyed to the second screening workshop 2 through the sixth belt conveyor 29; below one side of the 80-mm screen mesh are a fifth belt conveyor 28 and a seventh belt conveyor 30, and the sand and gravel with a size of >80 mm are conveyed to the first adjustment bin through the fifth belt conveyor 28 and the seventh belt conveyor 30; below one side of the 40-mm screen mesh is a fourth belt conveyor 27, and the sand and gravel with a size of 40 - 80 mm are conveyed to the second adjustment bin through the fourth belt conveyor 27; below one side of the 20-mm screen mesh is a third belt conveyor 26, and the sand and gravel with a size of 20 - 40 mm are conveyed to the second screening workshop 2 through the third belt conveyor 26; on one side of the first adjustment bin and the second adjustment bin is a cone crusher 9. The discharge port of the cone crusher 9 is located above the second belt conveyor 25. Workers dial the sand and gravel in the first adjustment bin and the second adjustment bin onto the cone crusher 9, and the sand and gravel after being crushed by the cone crusher 9 are conveyed to the first circular vibrating screen 7 through the second belt conveyor 25 for re-screening.

[0026] The diameter of the sand and gravel stacked in the sand making adjustment stockpile 10 of the second screening workshop 2 is 0 - 40 mm. Above the sand making adjustment stockpile 10, there is a ninth belt conveyor 32 for receiving the sand and gravel from the first screening workshop 1 and conveying the sand and gravel to the sand making adjustment stockpile 10. On one side of the sand making adjustment stockpile 10, there is a tenth belt conveyor 33. Workers dial the sand and gravel in the sand making adjustment stockpile 10 onto the tenth belt conveyor 33, and the tenth belt conveyor 33 can convey the sand and gravel to two vertical shaft crushers 11. Below the two vertical shaft crushers 11, there are an eleventh belt conveyor 34 and a twelfth belt conveyor 35 respectively, and the eleventh belt conveyor 34 and the twelfth belt conveyor 35 can convey the materials to the second circular vibrating screen 12. The second circular vibrating screen 12 is a circular vibrating screen with four groups and three layers of screen meshes of 5 mm, 10 mm, and 30 mm, and there is a discharge port at the bottom. Below the discharge port, there is a thirteenth belt conveyor 36, and the sand and gravel with a size of < 5 mm are conveyed to the rolled sand stockpile 20 through the thirteenth belt conveyor 36; on one side of the 30 mm screen mesh, it is located above the sixth belt conveyor 29, and the sand and gravel larger than 30 mm are conveyed to the ninth belt conveyor 32 through the sixth belt conveyor 29 for cyclic crushing; below one side of the 5 mm and 10 mm screen meshes, there is a fourteenth belt conveyor 37, and the sand and gravel with a size of 5 - 40 mm are conveyed to the screening and washing workshop 3 through the fourteenth belt conveyor 37.

[0027] The third circular vibrating screen 13 in the screening and washing workshop 3 can receive the sand and gravel conveyed by the fourteenth belt conveyor 37, and at this time, the diameter of the sand and gravel is 5 - 40 mm. Above the third circular vibrating screen 13, there is a washing water pipe 14, and the washing water pipe 14 sprays water when receiving and screening the sand and gravel to wash the sand and gravel. The third circular vibrating screen 13 is provided with three layers of screen meshes of 1 mm, 10 mm, and 20 mm, and there is a discharge port at the bottom, and the discharge port is connected to a sewage pipe, and the sewage pipe is not shown in the figure; below one side of the 20 mm screen mesh, there is a fifteenth belt conveyor 38, and the sand and gravel with a size of 20 - 40 mm are conveyed to the medium stone stockpile 16 through the fifteenth belt conveyor 38; below one side of the 10 mm screen mesh, there is a sixteenth belt conveyor 39, and the sand and gravel with a size of 10 - 20 mm are conveyed to the small stone stockpile 17 through the sixteenth belt conveyor 39; below one side of the 1 mm screen mesh, there is a seventeenth belt conveyor 40, and the sand and gravel with a size of 5 - 10 mm are conveyed to the pea gravel stockpile 18 through the seventeenth belt conveyor 40.

[0028] In order to further classify the rolled sand stockpile 20 according to the sand powder content. Below the thirteenth belt conveyor 36, there is also an eighteenth belt conveyor 41, and the eighteenth belt conveyor 41 is a reversible belt conveyor. After the eighteenth belt conveyor 41 receives the sand conveyed by the thirteenth belt conveyor 36, it is necessary for workers to judge the sand powder content, and convey the sand and gravel with a size of < 5 mm and a relatively high sand powder content to the rolled sand stockpile 20 through the eighteenth belt conveyor 41, and at the same time convey the sand with a size of < 5 mm and a high sand powder content to the nineteenth belt conveyor 42 and the sand washers 21 on both sides. According to the cleaning of the sand washers 21 and the mixing with dry sand to adjust the stone powder content, the qualified sand conveys the sand and gravel to the normal sand stockpile 19 through the twentieth belt conveyor 43 below it.

[0029] In addition, since the amount of sand and gravel with a diameter of 40-80 mm is less, the present invention also provides an eighth belt conveyor 31 below the fourth belt conveyor 27 of the first screening workshop 1. The eighth belt conveyor 31 is a reversible belt conveyor, and the eighth belt conveyor 31 is used to transport 40-80 mm sand and gravel to the second regulating silo or large stone pile 15 to meet the small demand for sand and gravel with a diameter of 40-80 mm.

[0030] In order to further make the granite sand and stone processing and classification system more flexible, one side of the 20mm screen of the first circular vibrating screen 7 is also connected to the sixth belt conveyor 29 through a plug-in shuttle slot; one side of the 30mm screen of the second circular vibrating screen 12 is also connected to the fourteenth belt conveyor 37 through a plug-in shuttle slot, and one side of the 5mm and 10mm screens are also connected to the sixth belt conveyor 29 through a plug-in shuttle slot respectively; one side of the 1mm screen of the third circular vibrating screen 13 is also connected to the sixteenth belt conveyor 39 through a plug-in shuttle slot; the third belt conveyor 26 is also connected to the eighth belt conveyor 31 through a plug-in shuttle slot.

[0031] The material direction after adding the plug-in shuttle slot is as follows Figure 2 As shown, when the production capacity of the second screening workshop 2 is excessive, the plug-in shuttle slot on one side of the 20mm screen of the first circular vibrating screen 7 can be opened to allow some 20-40mm sand and gravel to be transported to the second screening workshop 2 via the sixth belt conveyor 29 to accelerate the flow rate. When the production capacity of the second screening workshop 2 is insufficient, the connecting shuttle slot between the third belt conveyor 26 and the eighth belt conveyor 31 can be opened to allow some 20-40mm sand and gravel to be transported to the second regulating silo via the eighth belt conveyor 31 for cyclic crushing in the first screening workshop 1. At the same time, the shuttle slot on the side of the 30mm screen of the second circular vibrating screen 12 can be opened to allow some 30-40mm sand and gravel to be transported to the screening and washing workshop 3 via the fourteenth belt conveyor 37 to accelerate the flow rate. When the capacity of the screening and washing workshop 3 is insufficient, the shuttle slots on the 5mm and 10mm screens of the second circular vibrating screen 12 can be opened, allowing some 5-30mm sand and gravel to be transported to the sand making and conditioning pile 10 via the sixth belt conveyor 29 for recycling and crushing in the second screening workshop 2. When the capacity of the pebbles pile 18 is insufficient, the shuttle slots on the 1mm screen of the third circular vibrating screen 13 can be opened, allowing some 5-10mm sand and gravel to be transported to the small stone pile 17 via the sixteenth belt conveyor 39.

[0032] In order to further reduce manual labor, the semi-finished product pile 6, the adjusting silo 8 and the sand making adjusting material pile 10 of the first screening workshop 1 and the second screening workshop 2 are all box structures with openings on the top and one side. The bottoms of the semi-finished product pile 6, the adjusting silo 8 and the sand making adjusting material pile 10 are also respectively provided with motor vibrating feeders 23. The motor vibrating feeder 23 can vibrate the semi-finished product pile 6, the adjusting silo 8 and the sand making adjusting material pile 10 to feed materials to one side, avoiding manual material selection.

[0033] It should be noted that the vibrating feeder, jaw crusher, circular vibrating screen, cone crusher, vertical shaft crusher, sand washer, iron remover, motor vibrating feeder, belt conveyor, and plate-type shuttle chute mentioned in the present invention are all existing products and can be purchased on the market.

Claims

1. A granite sand processing and classification system, characterized in that : The granite sand and gravel processing and classification system includes a first screening workshop, a second screening workshop, and a screening and washing workshop; the first screening workshop consists of a vibrating feeder, a jaw crusher, a semi-finished product stockpile, a first circular vibrating screen, an adjusting silo, and a cone crusher, forming a granite sand and gravel circulating crushing path. The equipment is connected by several belt conveyors, and the screened medium and small-sized sand and gravel are transported to the second screening workshop through the belt conveyors; the second screening workshop consists of a sand-making adjusting silo, a vertical shaft crusher, and a second circular vibrating screen, forming a granite sand and gravel secondary crushing and screening path. The equipment is connected by several belt conveyors, and the medium and small-sized sand and gravel after secondary crushing and screening are transported to the screening and washing workshop through the belt conveyors; the screening and washing workshop consists of a third circular vibrating screen and a washing water pipe, forming a granite sand and gravel washing and classification path. The equipment is connected by several belt conveyors, and the medium and small-sized sand and gravel after washing and screening are transported to the medium-sized stone stockpile, small-sized stone stockpile, and pea gravel stockpile; the screen aperture of the first circular vibrating screen is larger than that of the second circular vibrating screen, and the screen aperture of the second circular vibrating screen is larger than that of the third circular vibrating screen; the top of the vibrating feeder in the first screening workshop is open to receive sand and gravel, and a jaw crusher is provided below one side of it. A first belt conveyor is provided below the jaw crusher. One end of the first belt conveyor is located below the jaw crusher, and the other end is located below the vibrating feeder. The first belt conveyor can transport sand and gravel to the semi-finished product stockpile. A second belt conveyor is provided on one side of the semi-finished product stockpile, and the second belt conveyor can transport sand and gravel to the first circular vibrating screen. The first circular vibrating screen is a set of two circular vibrating screens with three layers of screens of 20 mm, 40 mm, and 80 mm, and there is a discharge port at the bottom. A sixth belt conveyor is provided below the discharge port. A fifth belt conveyor and a seventh belt conveyor are provided below one side of the 80-mm screen. A fourth belt conveyor is provided below one side of the 40-mm screen. A third belt conveyor is provided below one side of the 20-mm screen. A cone crusher is provided on one side of the adjusting silo, and the discharge port of the cone crusher is located above the second belt conveyor; a ninth belt conveyor is provided above the sand-making adjusting silo in the second screening workshop. A tenth belt conveyor is provided on one side of the sand-making adjusting silo. A eleventh belt conveyor and a twelfth belt conveyor are respectively provided below the two vertical shaft crushers. The second circular vibrating screen is a set of four circular vibrating screens with three layers of screens of 5 mm, 10 mm, and 30 mm, and there is a discharge port at the bottom. A thirteenth belt conveyor is provided below the discharge port. One side of the 30-mm screen is located above the sixth belt conveyor. A fourteenth belt conveyor is provided below one side of the 5-mm and 10-mm screens; an eighteenth belt conveyor is also provided below the thirteenth belt conveyor. The eighteenth belt conveyor is a reversible belt conveyor. A nineteenth belt and a sand washer are provided below one side of the eighteenth belt conveyor. A twentieth belt conveyor is provided below the sand washer. The twentieth belt conveyor is a reversible belt conveyor;A flushing water pipe is provided above the third circular vibrating screen in the screening and flushing workshop. The third circular vibrating screen is provided with three layers of screen meshes of 1 mm, 10 mm, and 20 mm, and a discharge port is provided at the bottom. The discharge port is connected to a sewage pipe. A fifteenth belt conveyor is provided below one side of the 20-mm screen mesh, a sixteenth belt conveyor is provided below one side of the 10-mm screen mesh, and a seventeenth belt conveyor is provided below one side of the 1-mm screen mesh. An eighth belt conveyor is also provided below the fourth belt conveyor, and the eighth belt conveyor is a reversible belt conveyor. One side of the 20-mm screen mesh of the first circular vibrating screen is also connected to the sixth belt conveyor through a plug-type shuttle chute. One side of the 30-mm screen mesh of the second circular vibrating screen is also connected to the fourteenth belt conveyor through a plug-type shuttle chute, and one side of the 10-mm and 5-mm screen meshes are respectively connected to the sixth belt conveyor through a plug-type shuttle chute. One side of the 1-mm screen mesh of the third circular vibrating screen is also connected to the sixteenth belt conveyor through a plug-type shuttle chute. The third belt conveyor is also connected to the eighth belt conveyor through a plug-type shuttle chute.; 2. The granite sand and gravel processing and classification system according to claim 1, characterized in that: Above the first belt conveyor, there is a magnetic separator.

3. The granite sand and gravel processing and classification system according to claim 1, characterized in that: The semi-finished product stockpile, the regulating bin, and the sand-making regulating stockpile in the first screening workshop are all box structures with openings at the top and one side. Motorized vibrating feeders are also respectively provided at the bottoms of the semi-finished product stockpile, the regulating bin, and the sand-making regulating stockpile.

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