Sand making system for granite machine making

Abstract

The invention discloses a granite machine sand making system which structurally comprises a material box, the material box conveys materials into a jaw crusher through a conveyor for coarse crushing, and the materials crushed by the jaw crusher are conveyed into a cone crusher through the conveyor for medium and fine crushing. By adjusting the distance between the base plate and the grinding plate, the effect of rounding rough sand is improved, the sand is prepared into a round particle state, and the size fraction of the sand is 1t; the thickness is 0.6 mm, the roundness index is 0.8-0.85, the angularity index is 10-15, the product is nearly spherical and contains a small amount of stone powder, and 5%-10% of lt is reserved; and the 0.075 mm stone powder fills pores and improves the slurry wrapping property, the stress concentration of the contact surface of the sand particles in the state and the cement slurry is small, the micro-crack risk is not likely to be generated, the compactness and compressive strength of the hardened concrete are improved, the particle morphology and the stone powder activity are optimized through the system, and the service life of the concrete is prolonged. And the performance of the granite machine-made sand is close to or even superior to that of natural sand.

Description

Technical Field

[0001] The present invention relates to the field of granite sand making, and more specifically, to a granite machine-made sand making system. Background Art

[0002] Machine-made sand is a type of construction sand produced through industrialized equipment. It is made by crushing and screening ores (such as limestone and granite) or construction solid waste (such as tailings and tunnel slag) using sand making machines and other ancillary equipment (such as jaw crushers and cone crushers). The particle size is usually less than 4.75mm. Unlike natural sand, its production process is controllable, and the particle shape and specifications can be adjusted according to demand. The prior art discloses a granite artificial aggregate and machine-made sand processing system with the publication number CN215694663U, which includes a crushing workshop and a feeder for conveying raw materials in the crushing workshop. The feed port of the semi-finished product silo inputs materials below the screen surface of the feeder and semi-finished products processed by the first crusher after materials above the screen surface of the feeder are input; the first screening machine screens the materials in the semi-finished product silo and conveys them to the second crushing workshop, the third crushing workshop and the third screening machine respectively; the second screening machine screens the crushed materials in the second and third crushing workshops and conveys them to the third crushing workshop, the first finished product silo, the second finished product silo and the sand making and shaping workshop respectively; the third screening machine conveys the screened materials to the second finished product silo, the third finished product silo, the fourth finished product silo and the sand making and shaping workshop respectively; the materials in the sand making and shaping workshop enter the third screening machine after being crushed. The utility model adopts a three-stage crushing and two-stage loop process system to improve equipment utilization and increase process flexibility; The above-mentioned technical solution has the following deficiencies: the surface of the machine-made sand prepared by mechanically shaping the sand through the vertical shaft crusher is rough and angular, and it is impossible to prepare relatively round machine-made sand. The stress concentration on the contact surface between the machine-made sand with a rough and angular surface and the cement slurry is large, which is prone to the risk of microcracks, reducing the density and compressive strength of the hardened concrete. After sand making, the prepared sand particles are screened by a screen. The machine-made sand with a rough and angular surface is easy to clog the sieve holes of the fixed screen, thereby reducing the screening effect. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical purpose is: a granite machine-made sand making system, the structure of which includes a material box, the material box conveys the material into the jaw crusher for coarse crushing through a conveyor, the material crushed by the jaw crusher is conveyed to the cone crusher through a conveyor for medium and fine crushing, and the material crushed by the cone crusher is conveyed to the sand making machine through a conveyor for sand making. The sand making machine includes a machine box, a feed hopper, a throwing mechanism, and a grinding mechanism. The feed hopper is installed on the top of the machine box, and a support seat is provided at the bottom of the machine box. The throwing mechanism and the grinding mechanism are both installed inside the sand making machine. The throwing mechanism crushes the material into rough sand, and then the sand enters the grinding mechanism for rounding. The grinding mechanism includes a chassis and a rotating plate. The chassis is fixed inside the sand making machine, and the rotating plate is located on the upper surface of the chassis. A grinding plate is also provided at the bottom of the rotating plate. The rotating plate rotates with the driving shaft provided at the bottom of the sand making machine and cooperates with the chassis to grind the rough sand into a round shape.

[0004] As a further improvement of the present invention, the sand making machine also includes a motor and a transmission belt. The motor is installed at the upper end of the left side of the support seat, and the motor drives the drive shaft through the transmission belt to drive the throwing mechanism to rotate in the middle end inside the chassis.

[0005] As a further improvement of the present invention, the throwing mechanism includes a rotating disk and a peripheral guard plate, the rotating disk rotates along with the driving shaft, and the peripheral guard plate is fixed to the inner wall of the chassis at the same horizontal height as the rotating disk.

[0006] As a further improvement of the present invention, an impact head is installed on the outer surface of the rotating disk, a convex strip is provided on the outer side of the impact head and it is an integrated structure, and a groove strip is embedded on the inner surface of the peripheral guard plate.

[0007] As a further improvement of the present invention, an outer ring cover is further installed on the outside of the chassis, and a discharge port is provided on the right side of the outer ring cover, and the rotating plate and the grinding plate both rotate inside the outer ring cover.

[0008] As a further improvement of the present invention, a guide block is also installed on the outside of the outer ring cover, and the guide block is slidably installed on the inner wall of the chassis. A lifting plate is also installed on the bottom of the chassis in an axial connection, and the lower end of the lifting plate is eccentrically installed with the rotating disk. A first bevel gear is also installed on the lower end of the drive shaft, and a second bevel gear is engaged with the outside of the first bevel gear. The second bevel gear drives the rotating disk to rotate coaxially.

[0009] As a further improvement of the present invention, an inclined guide plate is installed inside the chassis below the discharge port. Under the inclined guidance of the inclined guide plate, sand is introduced from the guide pipe outside the chassis into the screening box located on the right side of the chassis for screening.

[0010] As a further improvement of the present invention, a screen mechanism, a lower guide port, and a rounded sand collection box are provided inside the sub-screening box. The screen mechanism is installed obliquely at the middle end of the sub-screening box to screen the prepared sand. The lower guide port is located below the screen mechanism and above the rounded sand collection box to conduct the finely screened sand to the rounded sand collection box for collection. The rough sand is introduced into the coarse material box installed at the lower right end of the sub-screening box along the inclined screen mechanism. A spiral elevator is connected to the inside of the coarse material box, which spirally lifts the rough sand inside the coarse material box to the inside of the chassis for circulation and rounding.

[0011] As a further improvement of the present invention, the screen mechanism consists of a moving frame, a screen, a cam, a first belt, a motor and a second belt. The screen is installed inside the moving frame, the cam is installed inside the screening box, and the cam is located below the moving frame. The motor drives the cam to rotate through the first belt, and the three cams rotate synchronously through the connected second belt; a sliding block is also installed at the outer end of the moving frame, and the sliding block is slidably installed inside the screening box. A spring guide rod is provided inside the screening box, and the spring guide rod is clearance-fitted and passes through the interior of the sliding block.

[0012] As a further improvement of the present invention, a contact guide plate is further provided at the upper right end inside the screening box, an extrusion rod is welded to the middle end of the back of the contact guide plate, a spring tube sleeve is fixed on the right side inside the screening box, and the extrusion rod is installed inside the spring tube sleeve with a clearance fit.

[0013] The beneficial effects of the present invention are: 1. The present invention improves the effect of rounding rough sand by providing a grinding mechanism and adjusting the distance between the base and the grinding plate. The sand is prepared into a rounded particle state. The sand has a particle size of <0.6mm, a roundness index of 0.8-0.85, an angularity index of 10-15, and is nearly spherical. It contains a small amount of stone powder, with 5%-10% of stone powder <0.075mm remaining. This fills pores and improves slurry encapsulation. In this state, the contact surface between the sand particles and the cement slurry has low stress concentration, is less likely to cause microcracks, and improves the density and compressive strength of the hardened concrete. By optimizing the particle morphology and stone powder activity through this system, the performance of granite machine-made sand can be made close to or even better than that of natural sand. 2. The present invention provides a screening box with a sieve mesh having a sieve aperture of 0.6 mm. When the prepared sand particles have a diameter less than 0.6 mm, they are discharged downward through the screen mesh 1112 and collected in the rounded sand collection box. Particles with a diameter greater than 0.6 mm enter the coarse material box. The coarse sand in the coarse material box is then lifted by a spiral elevator into the machine box for secondary rounding, effectively improving the preparation of sand into rounded particles with a diameter less than 0.6 mm. 3. The present invention sets a screen mechanism. When the cam protrusion contacts the movable frame, the movable frame is lifted up. After the cam protrusion separates from the movable frame, the movable frame descends and resets. In addition, under the elastic guidance of the spring guide rod and the sliding block, the movable frame drives the screen to shake up and down to shake the sand through the screen, thereby preventing the sand from being blocked inside the sieve holes of the screen 1112. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the sand making system of the present invention.

[0015] Figure 2 It is a schematic diagram of the internal structure of the sand making machine of the present invention.

[0016] Figure 3 It is a schematic diagram of the top structure of the throwing mechanism of the present invention.

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the throwing mechanism and the grinding mechanism of the present invention.

[0018] Figure 5 It is a schematic diagram of the half-section three-dimensional structure of the grinding mechanism of the present invention.

[0019] Figure 6 It is a side view structural diagram of the grinding mechanism of the present invention in working state.

[0020] Figure 7 Schematic diagram of the internal structure of the screening box of the present invention.

[0021] Figure 8 It is a structural schematic diagram of the screen mechanism of the present invention.

[0022] In the figure: 1. material box; 2. conveyor; 3. jaw crusher; 4. cone crusher; 5. sand making machine; 51. chassis; 52. feed hopper; 53. throwing mechanism; 531. rotating disc; 5311. impact head; 5312. convex strip; 532. peripheral guard plate; 5321. groove strip; 54. grinding mechanism; 541. chassis; 5411. outer ring cover; 5412. discharge port; 5413. guide block; 5413. first bevel gear; 5414. second bevel gear; 5415. rotating disc; 5416. lifting plate; 542. rotating plate; 5421. grinding plate; 5 5. Inclined guide plate; 56. Support seat; 57. Motor; 58. Transmission belt; 59. Drive shaft; 510. Material guide pipe; 511. Screen box; 5111. Screen mechanism; 1111. Moving frame; 1101. Spring guide rod; 1102. Sliding block; 1112. Screen; 1113. Cam; 1114. First belt; 1115. Motor; 1116. Second belt; 5112. Lower guide port; 5113. Rounded sand collection box; 5114. Contact guide plate; 1141. Extrusion rod; 1142. Spring tube sleeve; 512. Coarse material box; 513. Screw elevator. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings: Example 1: As attached Figure 1 To the attached Figure 6 As shown: The present invention provides a granite machine-made sand making system, which structure includes a material box 1. The material box 1 conveys the material into the jaw crusher 3 through a conveyor 2 for coarse crushing. The material crushed by the jaw crusher 3 is conveyed to the cone crusher 4 through a conveyor 2 for medium and fine crushing. The material crushed by the cone crusher 4 is conveyed to the sand making machine 5 through a conveyor 2 for sand making. The sand making machine 5 includes a chassis 51, a feed hopper 52, a throwing mechanism 53, and a grinding mechanism 54. The feed hopper 52 is installed on the top of the chassis 51, and a support base 56 is provided at the bottom of the chassis 51. The throwing mechanism 53 and the grinding mechanism 54 are both installed in the sand making machine 5. The throwing mechanism 53 crushes the material to form rough sand, which then enters the grinding mechanism 54 for rounding. The grinding mechanism 54 includes a chassis 541 and a rotating plate 542. The chassis 541 is fixed inside the sand making machine 5, and the rotating plate 542 is located on the upper surface of the chassis 541. A grinding plate 5421 is also provided at the bottom of the rotating plate 542. The rotating plate 542 rotates with the drive shaft 59 provided at the bottom of the sand making machine 5 and cooperates with the chassis 541 to grind the rough sand into a round shape; a guide block 5413 is also installed on the outside of the outer ring cover 5411, and the guide block 5413 is slidably installed on the inner wall of the chassis 51. A lifting plate 5416 is also axially connected to the bottom of the chassis 541, and the lower end of the lifting plate 5416 is eccentrically installed with the rotating disk 5415. A first bevel gear 5413 is also installed at the lower end of the drive shaft 59, and a second bevel gear 5414 is meshed with the outer side of the first bevel gear 5413. The second bevel gear 5414 drives the rotating disk 5415 to rotate coaxially.

[0024] The chassis 541 is a frustum-shaped structure that is narrow at the top and wide at the bottom, and is provided with eight rotating plates 542. The eight rotating plates 542 are all installed at an inclined angle to match the upper surface of the chassis 541. A grinding plate 5421 is provided at the bottom of each rotating plate 542. The bottom of the grinding plate 5421 is embedded with a semi-cylindrical cavity. The grinding plate 5421 is driven by a drive shaft 59 to rotate on the upper surface of the chassis 541, thereby grinding the rough sand into a round state. Systematic research has shown that the contact surface between the rounded sand particles and the cement slurry has less stress concentration, is less likely to generate micro cracks, and improves the density and compressive strength of the hardened concrete. There are three guide blocks 5413, all of which are arranged on the outer surface of the chassis 541. There are two second bevel gears 5414. The first bevel gear 5413 engages the two second bevel gears 5414 to rotate, and the drive shaft 59 rotates vertically to drive the rotating disk 5415 to rotate horizontally. The lifting plates 5416 installed on the eccentric shafts on the two rotating disks 5415 are lifted and lowered vertically as the rotating disk 5415 rotates, pushing the chassis 541 to perform reciprocating lifting and lowering adjustments. During the process, the three guide blocks 5413 are used for stable guidance, and the distance between the chassis 541 and the grinding plate 5421 is reciprocated to improve the effect of rounding the rough sand. The drive shaft 59 is clearance-fitted and passes through the center of the chassis 541, and the drive shaft 59 will not drive the chassis 541 to rotate.

[0025] Among them, the sand making machine 5 also includes a motor 57 and a transmission belt 58. The motor 57 is installed at the upper end of the left side of the support seat 56, and the motor 57 drives the drive shaft 59 through the transmission belt 58 to drive the throwing mechanism 53 to rotate in the middle end of the chassis 51.

[0026] The throwing mechanism 53 includes a rotating disk 531 and a peripheral guard plate 532. The rotating disk 531 rotates along with the drive shaft 59, and the peripheral guard plate 532 is fixed to the inner wall of the chassis 51 at the same level as the rotating disk 531. An impact head 5311 is mounted on the outer surface of the rotating disk 531. The outer side of the impact head 5311 is provided with a convex strip 5312 and is an integrated structure. The inner surface of the peripheral guard plate 532 is embedded with a groove strip 5321. The peripheral guard plate 532 is annularly embedded in the inner wall of the chassis 51 and is made of wear-resistant steel plate to prevent the material from directly impacting the inner wall of the chassis 51. The impact head 5311 is also made of wear-resistant steel plate. When the driving shaft 59 drives the impact head 5311 to rotate, it cooperates with the peripheral guard plate 532, and the convex strips 5312 and the groove strips 5321 are matched in structure to prepare the material into rough sand.

[0027] An outer ring cover 5411 is further installed on the outside of the chassis 541, and a discharge port 5412 is provided on the right side of the outer ring cover 5411. The rotating plate 542 and the grinding plate 5421 both rotate inside the outer ring cover 5411. An inclined guide plate 55 is further installed below the discharge port 5412 inside the chassis 51. Under the inclined guidance of the inclined guide plate 55, sand is introduced from the guide pipe 510 outside the chassis 51 into the interior of the screening box 511 located on the right side of the chassis 51 for screening. The inner diameter of the outer ring cover 5411 matches the length of the rotating plate 542, so that the rotating plate 542 is guided to rotate inside the outer ring cover 5411, and the rough sand is limited by the outer ring cover 5411 to prevent the grinding plate 5421 from discharging the rough sand downward without fully rounding it. The rounded sand can only be discharged downward through the discharge port 5412 on the right.

[0028] The specific usage and function of this embodiment are as follows: In the present invention, the granite material finely crushed in the cone crusher 4 enters the interior of the chassis 51 from the feed hopper 52, and is rotated by the motor 57 and transmitted by the transmission belt 58, so that the drive shaft 59 drives the rotating disk 531 to rotate, and the rotating disk 531 drives the impact head 5311 to rotate inside the peripheral guard plate 532, thereby preparing the material into rough sand. After double-layer impact, the preparation effect is improved, and then the rough sand falls down to the upper surface of the chassis 541. The drive shaft 59 synchronously drives the rotating plate 542 and the grinding plate 5421 to rotate to round the rough sand on the upper surface of the chassis 541. In the rounding process, the drive shaft 59 drives the first bevel gear 5413 to rotate vertically, causing the second bevel gear 5414 to rotate horizontally, driving the rotating disk 5415 to rotate coaxially, causing the lifting plate 5416 to lift and lower back and forth, and adjusting the height of the chassis 541 to lift and lower back and forth. By adjusting the distance between the chassis 541 and the grinding plate 5421, the effect of rounding the rough sand is improved, and the sand is prepared into a rounded particle state. The sand has a particle size of <0.6mm, a roundness index of 0.8-0.85, and an angularity index of 10-15. It is nearly spherical and contains a small amount of stone powder, retaining 5%-10% of <0.075mm stone powder, filling the pores and improving the slurry encapsulation. The contact surface stress concentration of the sand particles in this state with the cement slurry is small, and it is not easy to produce the risk of micro cracks, thereby improving the density and compressive strength of the hardened concrete. By optimizing the particle morphology, grading and stone powder activity through this system, the performance of granite machine-made sand can be made close to or even better than natural sand.

[0029] Example 2: As attached Figure 7 To the attached Figure 8 As shown: The sub-screening box 511 is provided with a screen mechanism 5111, a lower guide port 5112, and a rounded sand collecting box 5113. The screen mechanism 5111 is installed obliquely at the middle end of the sub-screening box 511 to screen the prepared sand. The lower guide port 5112 is located below the screen mechanism 5111 and above the rounded sand collecting box 5113, and the finely sieved sand is transferred to the rounded sand collecting box 5113 for collection. The rough sand is introduced into the coarse material box 512 installed at the lower right end of the sub-screening box 511 along the inclined screen mechanism 5111. The coarse material box 512 is connected to a spiral elevator 513, and the spiral elevator 513 spirally lifts the rough sand inside the coarse material box 512 to the inside of the chassis 51 for circulation and rounding.

[0030] Among them, the screen mechanism 5111 is composed of a moving frame 1111, a screen 1112, a cam 1113, a first belt 1114, a motor 1115 and a second belt 1116. The screen 1112 is installed inside the moving frame 1111, the cam 1113 is installed inside the screening box 511, and the cam 1113 is located below the moving frame 1111. The motor 1115 drives the cam 1113 to rotate through the first belt 1114, and the three cams 1113 rotate synchronously through the connected second belt 1116; a sliding block 1102 is also installed at the outer end of the moving frame 1111, and the sliding block 1102 is slidably installed inside the screening box 511, and a spring guide rod 1101 is provided inside the screening box 511, and the spring guide rod 1101 adopts a clearance fit to penetrate the interior of the sliding block 1102, and the spring guide rod 1101 consists of a vertical guide rod and a spring; The mesh size of the screen 1112 is 0.6 mm. When the prepared sand particles have a diameter less than 0.6 mm, they are discharged downward through the screen 1112 and collected in the rounded sand collection box 5113. Particles with a diameter greater than 0.6 mm enter the coarse material box 512. The coarse sand in the coarse material box 512 is spirally lifted by the spiral elevator 513 to the inside of the chassis 51 for secondary rounding, effectively improving the preparation of the sand into rounded particles with a diameter less than 0.6 mm. There are three cams 1113, and the three cams 1113 are distributed at the upper, middle and lower positions of the bottom of the inclined moving frame 1111. When the middle cam 1113 is driven to rotate by the motor 1115, the three cams 1113 rotate synchronously under the transmission of the second belt 1116. When the cam 1113 protrudes and contacts the moving frame 1111, the moving frame 1111 is lifted up, and after the cam 1113 protrudes and separates from the moving frame 1111, the moving frame 1111 descends and resets, and under the elastic guidance cooperation of the spring guide rod 1101 and the sliding block 1102, the moving frame 1111 drives the screen 1112 to shake up and down to shake the sand through the screen, thereby preventing the sand from being blocked inside the sieve holes of the screen 1112.

[0031] A contact guide plate 5114 is further provided at the upper right end of the screen box 511. An extrusion rod 1141 is welded to the middle end of the back of the contact guide plate 5114. A spring sleeve 1142 is fixed to the right side of the screen box 511. The extrusion rod 1141 is installed inside the spring sleeve 1142 with a clearance fit. The contact guide plate 5114 is axially connected to the upper right end of the screening box 511 in an inclined manner, and the extrusion rod 1141 and the spring tube sleeve 1142 are both in an arc-shaped state. The arc center of the extrusion rod 1141 and the spring tube sleeve 1142 is on the same axis as the axial connection center of the contact guide plate 5114 in the screening box 511. The spring arranged inside the spring tube sleeve 1142 applies elastic force to the extrusion rod 1141 to ensure that the contact guide plate 5114 can swing elastically when in contact with the sand, and push the sand onto the screen 1112, thereby speeding up the screening speed of the sand.

[0032] The specific usage and function of this embodiment are as follows: In the present invention, when the prepared sand enters the screening box 511 for screening, it comes into contact with the contact guide plate 5114, and the sand is pushed onto the screen 1112 for screening through the contact guide plate 5114. When the sand contacts the screen 1112 for screening, the sand that meets the preparation requirements is discharged downward through the screen 1112 to be collected in the rounded sand collection box 5113, while the sand that does not meet the standards enters the coarse material box 512. The rough sand inside the coarse material box 512 is spirally lifted by the spiral elevator 513 to the inside of the machine box 51 for secondary rounding, thereby ensuring that the granite machine-made sand meets the use requirements.

[0033] Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above technical effects, all fall within the scope of protection of the present invention.

Claims

1. A granite machine-made sand making system, comprising a material box (1), wherein the material box (1) conveys the material to a jaw crusher (3) via a conveyor (2) for coarse crushing, the material crushed by the jaw crusher (3) is conveyed to a cone crusher (4) via a conveyor (2) for medium and fine crushing, and the material crushed by the cone crusher (4) is conveyed to a sand making machine (5) via a conveyor (2) for sand making, and characterized in that: The sand making machine (5) comprises a machine case (51), a feed hopper (52), a throwing mechanism (53), and a grinding mechanism (54). The feed hopper (52) is installed on the top of the machine case (51), and a support base (56) is provided on the bottom of the machine case (51). The throwing mechanism (53) and the grinding mechanism (54) are both installed inside the sand making machine (5). The throwing mechanism (53) crushes the material to form rough sand, which then enters the grinding mechanism (54) for rounding. The grinding mechanism (54) comprises a chassis (541) and a rotating plate (542). The chassis (541) is fixed inside the sand making machine (5), and the rotating plate (542) is located on the upper surface of the chassis (541). A grinding plate (542) is further provided at the bottom of the rotating plate (542). The rotating plate (542) rotates along with a drive shaft (59) provided at the bottom of the sand making machine (5) to cooperate with the chassis (541) to grind the rough sand into a round shape.

2. The granite machine-made sand making system according to claim 1, characterized in that: The sand making machine (5) further comprises a motor (57) and a transmission belt (58), wherein the motor (57) is mounted on the upper left end of the support seat (56), and the motor (57) drives the drive shaft (59) through the transmission belt (58) to drive the throwing mechanism (53) to rotate in the middle end of the chassis (51).

3. The granite machine-made sand making system according to claim 2, characterized in that: The throwing mechanism (53) comprises a rotating disk (531) and a peripheral guard plate (532). The rotating disk (531) rotates along with the driving shaft (59), and the peripheral guard plate (532) is fixed to the inner wall of the chassis (51) at the same level as the rotating disk (531).

4. The granite machine-made sand making system according to claim 3 is characterized by: An impact head (5311) is mounted on the outer surface of the rotating disk (531), a convex strip (5312) is provided on the outer side of the impact head (5311) and the impact head (5311) is an integrated structure, and a groove strip (5321) is embedded on the inner surface of the peripheral guard plate (532).

5. The granite machine-made sand making system according to claim 1, characterized in that: An outer ring cover (5411) is also installed on the outside of the chassis (541), and a discharge port (5412) is provided on the right side of the outer ring cover (5411). The rotating plate (542) and the grinding plate (5421) both rotate inside the outer ring cover (5411).

6. The granite machine-made sand making system according to claim 5, characterized in that: A guide block (5413) is also installed on the outside of the outer ring cover (5411), and the guide block (5413) is slidably installed on the inner wall of the chassis (51). A lifting plate (5416) is also installed on the bottom of the chassis (541) in a shaft-connected manner, and the lower end of the lifting plate (5416) is eccentrically installed with the rotating disk (5415). A first bevel gear (5413) is also installed on the lower end of the drive shaft (59), and a second bevel gear (5414) is meshed with the outer side of the first bevel gear (5413). The second bevel gear (5414) drives the rotating disk (5415) to rotate coaxially.

7. The granite machine-made sand making system according to claim 5, characterized in that: An inclined guide plate (55) is further installed in the interior of the chassis (51) below the discharge port (5412). Under the inclined guidance of the inclined guide plate (55), sand is introduced from the guide pipe (510) outside the chassis (51) into the interior of the screening box (511) located on the right side of the chassis (51) for screening.

8. The granite machine-made sand making system according to claim 7, characterized in that: The sub-screening box (511) is provided with a screen mechanism (5111), a lower guide port (5112), and a rounded sand collection box (5113). The screen mechanism (5111) is obliquely installed at the middle end of the sub-screening box (511) to screen the produced sand. The lower guide port (5112) is located below the screen mechanism (5111) and above the rounded sand collection box (5113) to conduct finely screened sand to the rounded sand collection box (5113) for collection. The coarse sand is guided along the inclined screen mechanism (5111) into the coarse material box (512) installed at the lower right end of the sub-screening box (511). The coarse material box (512) is connected to a spiral elevator (513). The spiral elevator (513) spirally lifts the coarse sand in the coarse material box (512) into the interior of the machine box (51) for circulation and rounding.

9. The granite machine-made sand making system according to claim 8, characterized in that: The screen mechanism (5111) is composed of a moving frame (1111), a screen (1112), a cam (1113), a first belt (1114), a motor (1115), and a second belt (1116); the screen (1112) is installed inside the moving frame (1111); the cam (1113) is installed inside the screening box (511), and the cam (1113) is located below the moving frame (1111); the motor (1115) drives the cam (1113) to rotate via the first belt (1114); and the three cams (1113) rotate synchronously via the connected second belt (1116); A sliding block (1102) is also installed at the outer end of the movable frame (1111), and the sliding block (1102) is slidably installed inside the screening box (511). A spring guide rod (1101) is provided inside the screening box (511), and the spring guide rod (1101) is passed through the interior of the sliding block (1102) with a clearance fit.

10. The granite machine-made sand making system according to claim 9, characterized in that: A contact guide plate (5114) is further provided at the upper right end inside the screening box (511), and an extrusion rod (1141) is welded to the middle end of the back of the contact guide plate (5114). A spring tube sleeve (1142) is fixed to the right side inside the screening box (511), and the extrusion rod (1141) is installed inside the spring tube sleeve (1142) with a clearance fit.

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