Dry type fine sand grinding sand making machine

Abstract

The invention discloses a dry type fine sand grinding sand making machine. The speed reduction driving machine is installed on the mill support, the movable millstone is installed on the mill support and driven by the speed reduction driving machine to rotate, and the disc face of the movable millstone faces upwards; the top cover plate is arranged at the top of the mill support; the fixed millstone is installed on the top cover plate and located above the movable millstone; one end of the distance limiting pull rod is locked and connected to the fixed millstone, and the other end of the distance limiting pull rod penetrates through and is hung on the top cover plate; the disc pressing spring is located between the top cover plate and the fixed millstone and pushes and presses the fixed millstone downwards; the annular cavity type collecting hopper is arranged around the periphery of the movable millstone; and the feeding hopper is mounted on the top cover plate and is in butt joint with the feeding hole. The lower millstone is a movable millstone and cannot move in the axial direction; the upper millstone is a fixed millstone and can float up and down, and the lower limit position of the fixed millstone can be adjusted, so that the gap between the movable millstone and the fixed millstone is adjusted, the counter-acting force of the fixed millstone is presumed, and the granularity of a finished product is controllable.

Description

Technical Field

[0001] This invention relates to sand making and grinding technology, and more particularly to a dry fine sand grinding and sand making machine. Background Technology

[0002] Dry-mixed mortar production requires river sand smaller than 5mm. Sand purchased from dry-mixed mortar manufacturers often contains a significant amount of sand exceeding this size (i.e., sand heads). Traditionally, this excess sand is accumulated and then crushed using an impact crusher when the accumulation becomes substantial. However, this process is inefficient. Firstly, sand heads occupy considerable space, and prolonged storage leads to environmental damage and material moisture loss. Secondly, traditional crushing equipment requires significant investment and typically involves continuous, large-scale crushing of large quantities of sand heads. Currently, the crushers on the market primarily employ three crushing methods: centrifugal impact, hammer crushing, and roller crushing. These methods consume considerable power and are not conducive to controlling the particle size and shape of the finished product.

[0003] Chinese invention patent "CN215541329U - A Grinding and Sand Making Machine for Dry-Mixed Mortar Production and Processing" discloses a grinding and sand making machine with a fixedly connected lower grinding disc on its base and an upper grinding disc that cooperates with the lower grinding disc. Gears are arranged around the periphery of the upper grinding disc, and the rotation of the gears drives the upper grinding disc to rotate. Because the lower grinding disc is fixed and the upper grinding disc has a gear transmission structure, it is difficult to adjust the gap between the upper and lower grinding discs, which cannot meet the requirement of adjustable grinding disc gap for production, and cannot adjust the equipment's fitting gap according to the required sand particle size. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a dry fine sand grinding and sand making machine with adjustable grinding disc gap and grinding disc pressure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a dry fine sand grinding and sand making machine, which includes a mill support, a reduction drive motor installed on the mill support, a moving grinding disc with its disc surface facing upward, installed on the mill support and driven to rotate by the reduction drive motor, a top cover plate set on the top of the mill support, a fixed grinding disc installed on the top cover plate and located above the moving grinding disc, a distance limiting rod with one end locked to the fixed grinding disc and the other end passing through and hanging on the top cover plate, a pressure plate spring located between the top cover plate and the fixed grinding disc to push the fixed grinding disc downward, an annular cavity-type collection hopper arranged around the periphery of the moving grinding disc, a feed hole provided on the fixed grinding disc, and a feed hopper installed on the top cover plate and connected to the feed hole.

[0006] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the surfaces of the moving grinding disc and the fixed grinding disc are configured as concave and convex tooth surfaces formed by parallel tooth lines.

[0007] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the surfaces of the moving grinding disc and the fixed grinding disc are divided into multiple sectors, and the surface of a single sector is provided with tooth lines that are parallel to and extend to the circumference of the grinding disc.

[0008] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the tooth line is parallel to the contour edge of one side of the sector; the tooth lines of all sectors are parallel to the contour edge of the same side.

[0009] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the central angles of the sectors are the same, and the tooth lines of the adjacent sectors rotate and overlap; a discharge chute is provided between the sectors.

[0010] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, on the front side of the fixed grinding disc and the moving grinding disc that are opened and displayed to each other, the tooth lines of the fixed grinding disc and the moving grinding disc extend in the same direction.

[0011] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, a fixed grinding disc seat plate is attached to the upper side of the fixed grinding disc, and the fixed grinding disc seat plate and the fixed grinding disc are locked together by bolts. A movable grinding disc seat plate is attached to the lower side of the movable grinding disc, and the movable grinding disc seat plate and the movable grinding disc are locked together by bolts. The movable grinding disc seat plate is fixedly connected to the output shaft of the speed reducer. The limiting tie rod is a lead screw. One end of the lead screw is provided with an end cap and fixedly connected to the fixed grinding disc seat plate. The other end of the lead screw passes through the top cover plate and is screwed with a nut to adjust the length of the lead screw within the top cover plate.

[0012] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the inner ring wall of the collecting hopper is located inside the lower edge of the outer circumferential surface of the moving grinding disc, and the outer ring wall of the collecting hopper extends upward and forms a closed grinding chamber with the top cover plate.

[0013] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the inner ring wall of the collecting hopper is connected to an elastic wear-resistant ring plate that abuts against the bottom surface of the moving grinding disc; the bottom surface of the collecting hopper is inclined, and a discharge port is provided on the outer side at the lowest position of the collecting hopper.

[0014] As an improvement to the technical solution of the dry fine sand grinding and sand making machine of the present invention, the feed hole is located at a position 250mm away from the center of the grinding disc.

[0015] The beneficial effects of this invention are as follows: Driven by a speed reducer, the lower moving grinding disc of the dry fine sand grinding and sand making machine rotates, cooperating with the upper fixed grinding disc to perform shearing and frictional motion on the material between the two discs, thus crushing the granular material. The lower grinding disc is a moving disc, which can rotate but cannot float / jump up and down, and its axial direction is fixed; while the upper grinding disc is a fixed disc, not fixedly installed but floating, and cannot rotate, but can float up and down. Its vertical position can be adjusted by moving the limiting rod up and down to limit the lower limit position of the fixed grinding disc, thereby adjusting the gap between the moving and fixed grinding discs. The grinding disc gap is adjustable, thus meeting the requirements for producing different material particle sizes. A larger gap results in larger particle sizes, and a smaller gap results in smaller particle sizes, making the finished product particle size controllable. The larger the gap between the grinding discs, the greater the spring compression, and consequently, the greater the reaction force of the spring pushing the fixed grinding disc, which is more advantageous for crushing larger particle sizes. Attached Figure Description

[0016] Figure 1 This is a front cross-sectional structural diagram of a dry fine sand grinding and sand making machine according to the present invention.

[0017] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0018] Figure 3 A schematic diagram of the surface structure of the moving grinding disc.

[0019] Figure 4 A perspective view of the overlapping structure of the moving and stationary grinding discs. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the present invention discloses a dry fine sand grinding and sand making machine, which includes a mill support 11, a reduction drive motor 12 installed on the mill support 11, a moving grinding disc 22 with its disc surface facing upward, installed on the mill support and driven to rotate by the reduction drive motor, a top cover plate 31 disposed on the top of the mill support, a fixed grinding disc 33 installed on the top cover plate 31 and located above the moving grinding disc, a limiting tie rod 35 with one end locked to the fixed grinding disc 33 and the other end passing through and hanging on the top cover plate 31, a pressure plate spring 36 located between the top cover plate 31 and the fixed grinding disc 33 to push the fixed grinding disc 33 downward, an annular cavity-type collection hopper 51 disposed around the periphery of the moving grinding disc 22, a feed hole 38 disposed on the fixed grinding disc 33, and a feed hopper 39 installed on the top cover plate 31 and connected to the feed hole 38. Driven by the reducer 12, the dry fine sand grinding and sand making machine rotates the lower moving grinding disc 22, which works in conjunction with the upper fixed grinding disc 33 to shear and rub the material between the two discs, thus crushing the granular material. The lower grinding disc, the moving disc 22, can rotate but cannot float or jump up and down, and its axial direction is fixed. The upper grinding disc, the fixed disc 33, is not fixed but floating, and cannot rotate, but can float up and down. Its vertical position can be adjusted by moving the limiting rod 35 up and down, thereby limiting the lower limit position of the fixed grinding disc 33 and adjusting the gap between the moving grinding disc 22 and the fixed grinding disc 33. The grinding disc gap is adjustable to meet the requirements of producing different material particle sizes. A larger gap produces larger material particle sizes, and a smaller gap produces smaller material particle sizes. By controlling the grinding disc gap, the output particle size can be adjusted, making the finished product particle size controllable. The larger the gap between the grinding discs, the greater the spring compression, and consequently the greater the reaction force of the pressure plate spring 36 pushing the grinding disc 33, which is more advantageous for crushing materials with larger particle sizes. The lower grinding disc is the moving grinding disc 22, which rotates during operation and can generate a certain centrifugal force on the material it carries, creating a tendency to throw the material out, preventing the material from accumulating near the center between the grinding discs, and better pushing the material to the periphery of the lower grinding disc.

[0022] Before operation, the fine sand grinding equipment pre-adjusts the gap between the moving grinding disc 22 and the fixed grinding disc 33 according to the required output particle size. During operation, the pressure plate spring 36 pushes the fixed grinding disc 33 down to minimize the gap between the grinding discs. This allows the material to be crushed by the grinding discs during the pushing process, resulting in material particles of a certain size. This results in low energy consumption during the processing. Furthermore, by controlling the minimum gap between the grinding discs, the material processed by the grinding discs with the limited gap rolls a certain distance within the grinding discs, resulting in a more rounded particle shape.

[0023] This fine sand grinding and sand making machine has a fixed grinding disc at the top and a moving grinding disc at the bottom. The moving grinding disc 22 is driven by a motor and a reducer at the bottom (the reducer drive 12 includes a motor 28 that generates prime mover power and a reducer 29 that plays a transmission role). The mill support 11 simultaneously supports the drive system, grinding device, and crushing chamber. The integrated design eliminates the need for additional foundation construction, making the machine small in size and low in power consumption. It can be installed as a single unit or in groups of multiple units. Production enterprises only need to arrange the machines reasonably according to their own production capacity requirements and can process the generated sand at any time.

[0024] The surfaces of the moving grinding disc 22 and the fixed grinding disc 33 are designed with concave and convex tooth surfaces formed by parallel tooth lines 23. The concave and convex tooth surfaces can more effectively crush materials during operation, thereby reducing the generation of powder. The gap between the grinding discs is also an effective structural design to avoid the generation of powder.

[0025] Furthermore, the surfaces of the moving grinding disc 22 and the fixed grinding disc 33 are divided into multiple sectors. Each sector has parallel tooth lines 23 extending to the circumference of the grinding disc, thus creating multiple tooth line arrangements with the same pattern. During the rotation of the moving grinding disc 22, the tooth lines 23 of the two discs intersect in a scissor-like shape, allowing the edges of the tooth lines 23 to apply shearing and frictional forces to the raw material, resulting in higher crushing efficiency and lower power consumption. The tooth lines 23 extending to the circumference of the grinding disc cause the material obtained from the crushing and grinding process to fall off from the edge. The extended profile of the tooth lines 23 can be straight, arc-shaped, S-shaped, etc.

[0026] Specifically, the tooth lines 23 are parallel to the contour edge of one side of the sector. One tooth line extends adjacent to / along the contour edge, while the other tooth lines are laid out in parallel sequence, forming a set of side-by-side tooth grooves, each of which opens on the circumferential surface of the grinding disc for material discharge. The tooth lines of all sectors are parallel to the contour edge on the same side, ensuring that the arrangement of the tooth lines in each sector follows the same pattern. This facilitates the tooth lines of the two grinding discs forming a scissor shape with each other, creating a shear structure with intersecting tooth edges across the entire grinding disc surface. If the contour edge extends in a straight line, then the contour edge is the radius of the moving / fixed grinding disc.

[0027] Furthermore, the central angles of the sectors are the same, and the tooth lines of the adjacent sectors rotate to coincide, that is, the tooth lines are evenly distributed. In other words, the sectors are divided at equal angles on the circumference of the fixed grinding disc 33 and the moving grinding disc 22, and are evenly divided. This means that the points where the intersecting shear structure is located can be evenly distributed on the disc surfaces between the grinding discs, thereby making the crushing and grinding more uniform and the force on the grinding discs more balanced.

[0028] The sectors are provided with discharge troughs 25, which allow materials to roll and transfer between different sectors. Materials that meet the particle size requirements can be pushed out of the discharge troughs 25, achieving the effect of uniform material distribution.

[0029] In the case where the fixed grinding disc 33 and the moving grinding disc 22 are opened and displayed on their front sides, the tooth lines 23 of the fixed grinding disc 33 and the moving grinding disc 22 extend in the same direction. That is, the tooth lines 23 of the fixed grinding disc 33 and the moving grinding disc 22 extend along the same trajectory. When the fixed grinding disc 33 and the moving grinding disc 22 are joined together, the surfaces of the fixed grinding disc 33 and the moving grinding disc 22 are rotated 180 degrees symmetrically. This causes the tooth lines 23 of the fixed grinding disc 33 and the moving grinding disc 22 to form a shear angle with each other, and the shear structure points are distributed throughout the entire surface of the disc.

[0030] The fixed grinding disc 33 has a fixed grinding disc seat plate 32 attached to its upper side, and the fixed grinding disc seat plate 32 and the fixed grinding disc 33 are locked together by bolts. The movable grinding disc 22 has a movable grinding disc seat plate 21 attached to its lower side, and the movable grinding disc seat plate 21 and the movable grinding disc 22 are locked together by bolts. The movable grinding disc seat plate 21 is fixedly connected to the output shaft 26 of the reduction drive 12. The limiting tie rod 35 is a lead screw. One end of the lead screw has an end cap and is fixedly connected to the fixed grinding disc seat plate 32. The other end of the lead screw passes through the top cover plate 31 and is screwed with a nut to adjust the length of the lead screw within the top cover plate 31. The length of the lead screw within the top cover plate 31 determines the gap between the fixed grinding disc 33 and the movable grinding disc 22. The nut is located on the top cover plate 31, meaning that the raising and lowering of the lead screw can be adjusted by turning the nut from the outside, thereby setting or changing the gap between the fixed grinding disc 33 and the movable grinding disc 22 to obtain the material of the required particle size.

[0031] The inner annular wall 52 of the collecting hopper 51 is located inside the lower edge of the outer circumferential surface of the moving grinding disc 22, allowing the material discharged from the periphery of the moving grinding disc 22 to fall directly into the collecting hopper 51. The outer annular wall 53 of the collecting hopper 51 extends upward and forms a closed mill cavity with the top cover plate 31, placing the fixed grinding disc 33 and the moving grinding disc 22 within a sealed cavity, thus enhancing environmental friendliness. Of course, the moving grinding disc seat plate 21 of the moving grinding disc 22 can also serve as a partial enclosure wall of the mill cavity.

[0032] Furthermore, the upper edge of the inner annular wall 52 of the collecting hopper 51 is connected to an elastic wear-resistant ring 55 that abuts against the bottom surface of the moving grinding disc 22, thereby increasing the sealing of the mill cavity and better preventing dust from overflowing. The wear-resistant ring 55, which can be detachably attached, can be replaced when worn. The bottom surface of the collecting hopper 51 is inclined, and a discharge port 56 is provided on the outer side at the lowest position of the collecting hopper 51. Therefore, the overall working principle of this model is that the grinding disc with toothed lines 23 makes a circular motion. The raw material flows down from the feed hole 38 and enters the gap between the fixed grinding disc 33 and the moving grinding disc 22. Driven by the lower grinding disc / moving grinding disc 22, the material moves along the tangential direction and tooth direction of the grinding disc, and finally falls from the edge of the lower grinding disc / moving grinding disc 22 and is discharged through the inclined groove at the bottom of the mill cavity.

[0033] The feed hole 38 is located 250mm away from the center of the grinding disc 33. The feed hole 38 is located on the upper grinding disc 33, penetrating through the upper grinding disc. The feed hole 38 is positioned 250mm away from the center of the grinding disc to prevent material from accumulating in the center of the grinding disc and thus preventing it from being crushed, while maximizing the time the material is held in the mill.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A dry fine sand grinding sand making machine characterized by: The application relates to a grinding mill, which comprises a grinding mill support, a speed-reducing drive motor installed on the grinding mill support, a disc-shaped movable grinding disc installed on the grinding mill support and driven to rotate by the speed-reducing drive motor, a top cover plate arranged on the top of the grinding mill support, a fixed grinding disc installed on the top cover plate and located above the movable grinding disc, a limited-distance pull rod one end of which is locked to the fixed grinding disc and the other end of which passes through and hangs on the top cover plate, a pressing disc spring located between the top cover plate and the fixed grinding disc and used for pushing the fixed grinding disc downwards, a ring-shaped cavity type material collecting hopper arranged around the periphery of the movable grinding disc, a feeding hole arranged on the fixed grinding disc, and a feeding hopper installed on the top cover plate and connected to the feeding hole.

2. The dry fine sand grinding sand making machine according to claim 1, characterized in that: The disc surfaces of the movable grinding disc and the fixed grinding disc are provided with concave-convex tooth surfaces formed by parallel tooth lines.

3. The dry fine sand grinding sand making machine according to claim 2, characterized in that: The disc surfaces of the movable grinding disc and the fixed grinding disc are divided into multiple sectors, and the disc surfaces in a single sector are provided with tooth lines which are parallel and extend to the circumferential surface of the grinding disc.

4. The dry fine sand grinding sand making machine according to claim 3, characterized in that: The tooth lines are parallel to the profile edges of one side of the sectors; and the tooth lines of all the sectors are parallel to the profile edges of the same side.

5. The dry fine sand grinding sand making machine according to claim 3, characterized in that: The central angles of the sectors are the same, the tooth lines of the adjacent sectors are rotationally coincident, and a material discharging groove is arranged between the sectors.

6. The dry fine sand grinding sand making machine according to claim 4 or 5, characterized in that: In the front surface where the fixed grinding disc and the movable grinding disc are displayed, the tooth lines of the fixed grinding disc and the movable grinding disc extend in the same direction.

7. The dry fine sand grinding sand making machine according to claim 1, characterized in that: A fixed grinding disc base plate is arranged on the upper side of the fixed grinding disc, the fixed grinding disc base plate and the fixed grinding disc are locked together through bolts, a movable grinding disc base plate is arranged on the lower side of the movable grinding disc, the movable grinding disc base plate and the movable grinding disc are locked together through bolts, the movable grinding disc base plate is fixedly connected with the output shaft of the speed-reducing drive motor, the limited-distance pull rod is a screw rod, one end of the screw rod is provided with an end cap which is fixedly connected with the fixed grinding disc base plate, the other end of the screw rod passes through the top cover plate and is spirally sleeved with a nut so as to adjust the length of the screw rod in the top cover plate.

8. The dry fine sand grinding sand making machine according to claim 1, characterized in that: The inner side ring wall surface of the material collecting hopper is located on the inner side of the lower edge of the outer circumferential surface of the movable grinding disc, and the outer side ring wall surface of the material collecting hopper extends upwards and surrounds the top cover plate to form a closed grinding mill cavity.

9. The dry fine sand grinding sand making machine according to claim 8, characterized in that: The upper edge part of the inner side ring wall surface of the material collecting hopper is connected with an elastic wear-resistant ring piece which abuts against the bottom surface of the movable grinding disc, and the bottom surface of the material collecting hopper is arranged to be inclined and provided with a discharging port at the lowest position of the material collecting hopper.

10. The dry fine sand grinding sand making machine according to claim 1, characterized in that: The feeding hole is located at a position which is 250 mm away from the disc center of the fixed grinding disc.

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