Granite mechanism sand making system

Abstract

The application discloses a granite mechanism sand making system, which comprises a material box. Material is conveyed into the inside of a jaw crusher through a conveyor for rough crushing. The material crushed by the jaw crusher is transmitted into the inside of a cone crusher through a conveyor for medium and fine crushing. A grinding mechanism is arranged. The distance between a bottom plate and a grinding plate is adjusted to improve the effect of rounding the coarse sand, so that the sand is prepared into a round particle state. The particle size of the sand is less than 0.6 mm, the roundness index is 0.8-0.85, the angularity index is 10-15, the sand is nearly spherical, contains a small amount of stone powder, retains 5%-10% of <0.075 mm stone powder, fills pores and improves the slurry wrapping property. The contact surface stress concentration of the sand particle in the state is small, and the sand particle is not prone to micro-crack risk. The compactness and compressive strength of hardened concrete are improved. Through optimization of the particle morphology and stone powder activity of the system, the performance of the granite mechanism sand can be close to or even better than that of natural sand.

Description

Technical Field

[0001] This invention relates to the field of granite sand making, and more specifically, to a granite manufactured sand making system. Background Technology

[0002] Manufactured sand is a type of construction sand produced by industrial equipment. It is made by crushing and screening ores (such as limestone and granite) or construction waste (such as tailings and tunnel slag) using sand making machines and other auxiliary equipment (such as jaw crushers and cone crushers). The particle size is usually less than 4.75 mm. Unlike natural sand, its production process is controllable and the particle shape and specifications can be adjusted according to demand. A prior art patent, CN215694663U, discloses a granite artificial aggregate and manufactured sand processing system. This system includes a primary crushing workshop and a feeder for conveying raw materials from the primary crushing workshop. The inlet of the semi-finished product silo receives materials below the feeder's screen surface and semi-finished products from materials above the feeder's screen surface after processing by the first crusher. A first screening machine separates the materials in the semi-finished product silo and conveys them to the secondary crushing workshop, tertiary crushing workshop, and third screening machine. A second screening machine separates the crushed materials from the secondary and tertiary crushing workshops and conveys them to the tertiary crushing workshop, the first finished product silo, the second finished product silo, and the sand making and shaping workshop. A third screening machine conveys the screened materials to the second, third, and fourth finished product silos and the sand making and shaping workshop. Materials in the sand making and shaping workshop are crushed and then enter the third screening machine. This invention employs a three-stage crushing and two-stage loop process system, improving equipment utilization and increasing process flexibility. The above-disclosed technical solutions have the following shortcomings: the manufactured sand produced by mechanical sand shaping using a vertical shaft impact crusher has a rough and angular surface, making it impossible to produce relatively rounded manufactured sand. The rough and angular surface of the manufactured sand results in greater stress concentration at the contact surface with the cement paste, which easily leads to the risk of micro-cracks, reducing the density and compressive strength of the hardened concrete. Furthermore, after sand making, the sand particles are screened by a sieve, and the rough and angular surface of the manufactured sand easily clogs the inside of the screen holes, thus reducing the screening effect. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical objective is: a granite manufactured sand making system, the structure of which includes a material box, the material box is conveyed by a conveyor into the jaw crusher for coarse crushing, the material after being crushed by the jaw crusher is conveyed by a conveyor into the cone crusher for medium and fine crushing, the material after being crushed by the cone crusher is conveyed by a conveyor into the sand making machine 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 base 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 to form coarse sand and then 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 drive shaft at the bottom of the sand making machine and cooperates with the chassis to grind the rough sand into 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 on the upper left side of the support base, and the motor drives the drive shaft through the transmission belt to drive the material throwing mechanism to rotate in the middle of the machine box.

[0005] As a further improvement of the present invention, the material throwing mechanism includes a first rotating disk and a peripheral guard plate. The first rotating disk rotates with the drive shaft, and the peripheral guard plate is fixed to the inner wall of the machine housing at the same horizontal height as the first rotating disk.

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

[0007] As a further improvement of the present invention, an outer ring cover is also installed on the outside of the chassis, and a discharge port is provided on the right side of the outer ring cover. 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 outer side of the outer ring cover. The guide block is slidably installed on the inner wall of the chassis. A lifting plate is also axially connected to the bottom of the chassis. The lower end of the lifting plate is eccentrically installed with the second rotating disk. A first bevel gear is also installed on the lower end of the drive shaft. A second bevel gear meshes with the outer side of the first bevel gear. The second bevel gear drives the second rotating disk to rotate coaxially.

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

[0010] As a further improvement of the present invention, the screening box is provided with a screen mechanism, a lower guide port, and a rounded sand collection box. The screen mechanism is installed at an incline in the middle of the screening box to screen the produced sand. The lower guide port is located below the screen mechanism and above the rounded sand collection box, which conducts the finely screened sand into the rounded sand collection box for collection. The coarse sand is guided along the inclined screen mechanism into the coarse material box installed at the lower right end of the screening box. The coarse material box is connected to a screw conveyor, which screws the coarse sand in the coarse material box into the machine box 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 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, and a spring guide rod is provided inside the screening box, and the spring guide rod passes through the sliding block with clearance fit.

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

[0013] The beneficial effects of this invention are as follows: 1. This invention improves the rounding effect of coarse sand by setting up a grinding mechanism and adjusting the distance between the chassis and the grinding plate, thus preparing the sand into rounded particles with a particle size <0.6mm, a roundness index of 0.8-0.85, an angularity index of 10-15, and a near-spherical shape. It contains a small amount of stone powder, retaining 5%-10% <0.075mm stone powder to fill pores and improve the slurry encapsulation. The sand particles in this state have less stress concentration at the contact surface with the cement paste, making it less prone to micro-cracks. This 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 manufactured sand can be close to or even better than that of natural sand. 2. This invention uses a sieving box with a sieve mesh size of 0.6mm. When the diameter of the prepared sand particles is less than 0.6mm, they are discharged through the sieve into the rounded sand collection box for collection. Particles with a diameter greater than 0.6mm enter the coarse material box, where a screw conveyor lifts the coarse sand into the machine for secondary rounding. This effectively improves the process of preparing sand into rounded particles with a diameter of less than 0.6mm. 3. By setting up a screen mechanism, when the cam protrusion contacts the moving frame, it lifts the moving frame. After the cam protrusion separates from the moving frame, the moving frame descends and resets. Under the elastic guidance of the spring guide rod and the sliding block, the moving frame drives the screen to shake up and down to shake the sand through the screen, thus preventing the sand from clogging inside the screen holes of the screen 1112. Attached Figure Description

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

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

[0016] Figure 3 This is a top view of the material throwing mechanism of the present invention.

[0017] Figure 4 This is a three-dimensional structural diagram of the material throwing mechanism and the grinding mechanism of the present invention.

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

[0019] Figure 6 This is a side view of the grinding mechanism of the present invention in its working state.

[0020] Figure 7 This is a schematic diagram of the internal structure of the sieving box of the present invention.

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

[0022] In the diagram: 1. Material bin; 2. Conveyor; 3. Jaw crusher; 4. Cone crusher; 5. Sand making machine; 51. Chassis; 52. Feed hopper; 53. Throwing mechanism; 531. First rotating disc; 5311. Impact head; 5312. Raised bar; 532. Peripheral guard plate; 5321. Groove bar; 54. Grinding mechanism; 541. Chassis; 5411. Outer ring cover; 5412. Discharge port; 5413. Guide block; 5414. Second bevel gear; 5415. Second rotating disc; 5416. Lifting plate; 5417. First bevel gear; 542. Rotating plate; 5421. Grinding plate 55. Inclined guide plate; 56. Support base; 57. Motor; 58. Conveyor belt; 59. Drive shaft; 510. Guide pipe; 511. Screening box; 5111. Screening 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. Round sand collection box; 5114. Contact guide plate; 1141. Extrusion rod; 1142. Spring sleeve; 512. Coarse material box; 513. Screw elevator. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings: Example 1:

[0024] As attached Figure 1 To be continued Figure 6 As shown: This invention discloses a granite manufactured sand making system, the structure of which includes a material box 1. The material box 1 is conveyed by a conveyor 2 into a jaw crusher 3 for coarse crushing. The material crushed by the jaw crusher 3 is then conveyed by the conveyor 2 to a cone crusher 4 for medium and fine crushing. The material crushed by the cone crusher 4 is then conveyed by the conveyor 2 to a sand making machine 5 for sand making. The sand making machine 5 includes a casing 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 casing 51, and a support base 56 is provided at the bottom of the casing 51. The throwing mechanism 53 and the grinding mechanism 54 are both installed inside the sand making machine 5. After the throwing mechanism 53 crushes the material into coarse sand, it 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 at the bottom of the sand making machine 5 and cooperates with the chassis 541 to grind the rough sand into round shape. A guide block 5413 is also installed on the outer side of the outer ring cover 5411. The guide block 5413 is slidably installed on the inner wall of the machine housing 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 second rotating disk 5415. A first bevel gear 5417 is also installed at the lower end of the drive shaft 59, and a second bevel gear 5414 meshes with the outer side of the first bevel gear 5417. The second bevel gear 5414 drives the second rotating disk 5415 to rotate coaxially.

[0025] The chassis 541 is a frustum-shaped structure that is narrow at the top and wide at the bottom, and eight rotating plates 542 are provided. All eight rotating plates 542 are installed at an inclined angle to match the upper surface of the chassis 541. Each rotating plate 542 has a grinding plate 5421 at its bottom. The bottom of the grinding plate 5421 is embedded with a semi-cylindrical cavity. The grinding plate 5421 is driven by the drive shaft 59 to rotate on the upper surface of the chassis 541, thereby grinding the coarse sand into a rounded state. Systematic research shows that the stress concentration at the contact surface between the rounded sand particles and the cement paste is smaller, which reduces the risk of micro-cracks and improves the density and compressive strength of the hardened concrete. Three guide blocks 5413 are provided, all located on the outer surface of the chassis 541. Two second bevel gears 5414 are provided. The first bevel gear 5417 meshes with the two second bevel gears 5414 to rotate, which in turn drives the drive shaft 59 to rotate vertically and drives the second rotating disk 5415 to rotate horizontally. The lifting plates 5416 mounted on the eccentric shafts of the two second rotating disks 5415 move vertically up and down as the second rotating disks 5415 rotate, thus driving the chassis 541 to reciprocate up and down adjustment. During the process, the three guide blocks 5413 provide stable guidance and reciprocate to adjust the distance between the chassis 541 and the grinding plate 5421, thereby improving the effect of rounding the rough sand. The drive shaft 59 is fitted with a clearance fit and passes through the center of the chassis 541, so the drive shaft 59 will not drive the chassis 541 to rotate.

[0026] The sand making machine 5 also includes a motor 57 and a transmission belt 58. The motor 57 is installed on the upper left side of the support base 56, and the motor 57 drives the drive shaft 59 through the transmission belt 58 to drive the material throwing mechanism 53 to rotate in the middle of the machine box 51.

[0027] The material throwing mechanism 53 includes a first rotating disk 531 and a peripheral guard plate 532. The first rotating disk 531 rotates with the drive shaft 59, and the peripheral guard plate 532 is fixed to the inner wall of the housing 51 and is at the same horizontal height as the first rotating disk 531. An impact head 5311 is installed on the outer surface of the first rotating disk 531. The impact head 5311 has a protrusion 5312 on its outer side and is an integrated structure. The inner surface of the peripheral guard plate 532 is embedded with a groove 5321. The peripheral guard plate 532 is annularly embedded in the inner wall of the housing 51 and is made of wear-resistant steel plate to prevent materials from directly impacting the inner wall of the housing 51. The impact head 5311 is also made of wear-resistant steel plate. When the drive shaft 59 drives the impact head 5311 to rotate, it cooperates with the peripheral guard plate 532. The protrusion 5312 and the groove 5321 are structurally matched to prepare the material into coarse sand.

[0028] 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. An inclined guide plate 55 is also installed inside the machine box 51 below the discharge port 5412. Under the inclined guidance of the inclined guide plate 55, the sand is introduced from the guide pipe 510 on the outside of the machine box 51 into the screening box 511 located on the right side of the machine box 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. The outer ring cover 5411 also limits the coarse sand, preventing the grinding plate 5421 from discharging the coarse sand before it is fully rounded. The rounded sand can only be discharged downward through the discharge port 5412 on the right side.

[0029] The specific usage and function of this embodiment are as follows: In this invention, the granite material finely crushed in the cone crusher 4 enters the machine housing 51 from the feed hopper 52. The motor 57 rotates and the transmission belt 58 drives the drive shaft 59 to drive the first rotating disk 531 to rotate. The first rotating disk 531 drives the impact head 5311 to rotate inside the peripheral guard plate 532, making the material into coarse sand. The double-layer impact improves the preparation effect. Then the coarse 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 and grind the coarse sand on the upper surface of the chassis 541 to round it. Furthermore, during the rounding process, the drive shaft 59 drives the first bevel gear 5417 to rotate vertically, causing the second bevel gear 5414 to rotate horizontally, driving the second rotating disk 5415 to rotate coaxially, causing the lifting plate 5416 to reciprocate up and down, adjusting the height of the chassis 541. By adjusting the distance between the chassis 541 and the grinding plate 5421, the effect of rounding the coarse sand is improved, and the sand is prepared into a rounded particle state. The sand particle size is <0.6mm, the roundness index is 0.8-0.85, the angularity index is 10-15, and it is nearly spherical, containing a small amount of stone powder, retaining 5%-10% <0.075mm stone powder to fill the pores and improve the slurry encapsulation. The sand particles in this state have less stress concentration at the contact surface with the cement slurry, and are less likely to generate micro-cracks, improving the density and compressive strength of the hardened concrete. By optimizing the particle morphology, gradation and stone powder activity through this system, the performance of granite manufactured sand can be close to or even better than that of natural sand.

[0030] Example 2: As attached Figure 7 To be continued Figure 8 As shown: The screening box 511 is equipped with a screen mechanism 5111, a lower guide port 5112, and a rounded sand collection box 5113. The screen mechanism 5111 is installed at an incline in the middle of the 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, which conducts the finely screened sand into 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 side of the screening box 511. The coarse material box 512 is connected to a screw conveyor 513, which screws the coarse sand in the coarse material box 512 into the machine box 51 for circulation and rounding.

[0031] The screen mechanism 5111 consists of a movable 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 movable frame 1111. The cam 1113 is installed inside the screening box 511 and is located below the movable frame 1111. The motor 1115 drives the cam 1113 to rotate through the first belt 1114. 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 movable frame 1111 and is slidably installed inside the screening box 511. A spring guide rod 1101 is provided inside the screening box 511 and passes through the sliding block 1102 with a clearance fit. The spring guide rod 1101 consists of a vertical guide rod and a spring. The screen 1112 has a mesh size of 0.6 mm. When the diameter of the prepared sand particles is less than 0.6 mm, they are discharged through the screen 1112 and collected inside the rounded sand collection box 5113. The particles with a diameter greater than 0.6 mm enter the coarse material box 512. The coarse sand inside the coarse material box 512 is spirally lifted by the screw conveyor 513 into the machine box 51 for secondary rounding, which effectively improves the sand preparation into rounded particles with a diameter of less than 0.6 mm. Three cams 1113 are provided, and the three cams 1113 are distributed in 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 protrusion contacts the moving frame 1111, it lifts the moving frame 1111. After the cam 1113 protrusion separates from the moving frame 1111, the moving frame 1111 falls back to its original position. Under the elastic guidance 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, so as to avoid the sand from clogging the screen holes of the screen 1112.

[0032] The upper right end of the screening box 511 is also provided with a contact guide plate 5114. A pressing rod 1141 is welded to the middle of the back of the contact guide plate 5114. A spring tube sleeve 1142 is fixed inside the right side of the screening box 511. The pressing rod 1141 is installed inside the spring tube sleeve 1142 with clearance fit. The contact guide plate 5114 is inclined and axially connected to the upper right end of the screening box 511. The inside of the extrusion rod 1141 and the spring tube sleeve 1142 are both arc-shaped. The center of the arc of the extrusion rod 1141 and the center of the axial connection of the contact guide plate 5114 inside the screening box 511 is on the same axis. The spring set inside the spring tube sleeve 1142 applies elastic force to the extrusion rod 1141, ensuring that the contact guide plate 5114 can elastically swing when in contact with sand, pushing the sand onto the screen 1112 and accelerating the screening speed of the sand.

[0033] The specific usage and function of this embodiment are as follows: In this invention, when the prepared sand enters the screening box 511 for sieving, it comes into contact with the contact guide plate 5114. The contact guide plate 5114 pushes the sand onto the screen 1112 for sieving. When the sand comes into contact with the screen 1112 for sieving, the sand that meets the preparation requirements is discharged downward through the screen 1112 into the rounded sand collection box 5113 for collection, while the sand that does not meet the standards enters the coarse material box 512. The coarse sand in the coarse material box 512 is spirally lifted into the machine housing 51 by the screw conveyor 513 for secondary rounding, ensuring that the granite manufactured sand meets the requirements for use.

[0034] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A granite manufactured sand making system, comprising a material box (1), wherein the material box (1) conveys material into a jaw crusher (3) for coarse crushing via a conveyor (2), the material after being crushed by the jaw crusher (3) is conveyed by the conveyor (2) to a cone crusher (4) for medium and fine crushing, and the material after being crushed by the cone crusher (4) is conveyed by the conveyor (2) to a sand making machine (5) for sand making, characterized in that: The sand making machine (5) includes a machine box (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 box (51), and a support base (56) is provided at the bottom of the machine box (51). The throwing mechanism (53) and the grinding mechanism (54) are both installed inside the sand making machine (5). After the throwing mechanism (53) crushes the material to form coarse sand, it 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 round shape. The material throwing mechanism (53) includes a first rotating disk (531) and a peripheral guard plate (532). The first rotating disk (531) rotates with the drive shaft (59), and the peripheral guard plate (532) is fixed to the inner wall of the housing (51) at the same horizontal height as the first rotating disk (531). An impact head (5311) is installed on the outer surface of the first rotating disk (531). The impact head (5311) has a protrusion (5312) on its outer side and is an integral structure. The inner surface of the peripheral guard plate (532) is embedded with a groove strip (5321). 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). A guide block (5413) is also installed on the outer side of the outer ring cover (5411). 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) with a shaft connection. The lower end of the lifting plate (5416) is eccentrically installed with the second rotating disk (5415). A first bevel gear (5417) is also installed on the lower end of the drive shaft (59). A second bevel gear (5414) meshes with the outer side of the first bevel gear (5417). The second bevel gear (5414) drives the second rotating disk (5415) to rotate coaxially.

2. The granite manufactured sand production system according to claim 1, characterized in that: The sand making machine (5) also includes a motor (57) and a transmission belt (58). The motor (57) is installed on the upper left side of the support base (56), and the motor (57) drives the drive shaft (59) through the transmission belt (58) to drive the material throwing mechanism (53) to rotate in the middle of the machine box (51).

3. The granite manufactured sand production system according to claim 1, characterized in that: An inclined guide plate (55) is installed inside the casing (51) below the discharge port (5412). Under the inclined guidance of the inclined guide plate (55), the sand is introduced from the feed pipe (510) outside the casing (51) into the screening box (511) located on the right side of the casing (51) for screening.

4. A granite manufactured sand production system according to claim 3, characterized in that: The screening box (511) is equipped with a screen mechanism (5111), a lower guide port (5112), and a rounded sand collection box (5113). The screen mechanism (5111) is installed at an incline in the middle of the 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 the fine 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 side of the screening box (511). The coarse material box (512) is connected to a screw conveyor (513). The screw conveyor (513) screws the coarse sand in the coarse material box (512) into the machine box (51) for circulating grinding.

5. A granite manufactured sand production system according to claim 4, characterized in that: The screen mechanism (5111) consists of a movable 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 movable frame (1111). The cam (1113) is installed inside the screening box (511) and is located below the movable frame (1111). The motor (1115) drives the cam (1113) to rotate through the first belt (1114). The three cams (1113) rotate synchronously through the connected second belt (1116). The outer end of the movable frame (1111) is also equipped with a sliding block (1102), and the sliding block (1102) is slidably installed inside the screening box (511). The screening box (511) is provided with a spring guide rod (1101), and the spring guide rod (1101) is inserted through the sliding block (1102) with clearance fit.

6. A granite manufactured sand production system according to claim 5, characterized in that: The upper right end of the screening box (511) is also provided with a contact guide plate (5114). A pressing rod (1141) is welded to the middle of the back of the contact guide plate (5114). A spring tube sleeve (1142) is fixed inside the right side of the screening box (511). The pressing rod (1141) is installed inside the spring tube sleeve (1142) with clearance fit.

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