Dry type fine sand grinding sand making machine

Abstract

The utility model 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] The utility model relates to a sand making and grinding technology, in particular to a dry fine sand grinding and sand making machine. Background Art

[0002] The production of dry-mixed mortar requires river sand with a particle size of less than 5 mm. The sand purchased by dry-mixed mortar manufacturers will contain more sand (i.e. sand heads) that exceed this particle size. The traditional practice is to accumulate the sand that exceeds the particle size, and then use an impact sand making machine to crush it when the accumulation of sand heads is large. On the one hand, the sand heads take up a lot of space, and they will face environmental and material moisture losses after being stored for a long time. On the other hand, the investment in traditional crushing equipment is also relatively large, and large quantities of sand heads are usually crushed continuously on a large scale. There are currently three main types of crushing methods for crushers on the market: centrifugal impact, hammer beating, and roller extrusion. They consume a lot of power and are not conducive to controlling the particle size and shape of the finished product.

[0003] The Chinese utility model patent "CN215541329U-A grinding sand making machine for dry-mixed mortar production and processing" discloses a grinding sand making machine, whose base is provided with a fixedly connected lower grinding disc, an upper grinding disc matched with the lower grinding disc, and a gear is arranged around the peripheral edge of the upper grinding disc, and the upper grinding disc is driven to rotate by the rotation of the gear. Since the lower grinding disc is fixedly arranged and the upper grinding disc is provided with a gear transmission structure, it is difficult to adjust the gap between the upper grinding disc and the lower grinding disc, and the requirement of adjustable grinding disc gap required for production cannot be met, and the matching gap of the equipment cannot be adjusted according to the particle size required for sand making. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a dry fine sand grinding sand making machine with adjustable grinding disc gap and grinding disc pressure.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a dry fine sand grinding sand making machine, which includes a mill bracket, a reduction drive motor installed on the mill bracket, a movable grinding disc with a disc surface facing upward, which is installed on the mill bracket and driven to rotate by the reduction drive motor, a top cover plate arranged on the top of the mill bracket, a fixed grinding disc installed on the top cover plate and located above the movable grinding disc, a distance limiting pull 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 collecting hopper arranged around the periphery of the movable grinding disc, a feed hole arranged on the fixed grinding disc, and a supply hopper installed on the top cover plate and docked with the feed hole.

[0006] As an improvement on the technical solution of the dry fine sand grinding sand making machine of the utility model, the disc surfaces of the movable grinding disc and the fixed grinding disc are configured as concave and convex tooth surfaces formed by side-by-side tooth lines.

[0007] As an improvement on the technical solution of the dry fine sand grinding sand making machine of the utility model, the disc surfaces of the movable grinding disc and the fixed grinding disc are divided into a plurality of sectors, and the disc surface in a single sector is provided with tooth lines parallel to and extending to the circumferential surface of the grinding disc.

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

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

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

[0011] As an improvement on the technical solution of the dry fine sand grinding and sand making machine of the utility model, a fixed grinding disc seat plate is fitted on 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 moving grinding disc seat plate is fitted on the lower side of the moving grinding disc, and the moving grinding disc seat plate and the moving grinding disc are locked together by bolts, and the moving grinding disc seat plate is fixedly connected to the output shaft of the reduction drive machine; the distance limiting pull rod is a screw rod, one end of which is provided with an end cap and fixedly connected to the fixed grinding disc seat plate, and the other end of the screw rod passes through the top cover plate and is spirally sleeved with a nut to adjust the length of the screw rod within the top cover plate.

[0012] As an improvement of the technical solution of the dry fine sand grinding sand making machine of the utility model, the inner annular wall surface of the collecting hopper is located on the inner side of the lower edge of the outer circumferential surface of the moving grinding disc, and the outer annular wall surface of the collecting hopper extends upward and forms a closed grinding mill cavity with the top cover plate.

[0013] As an improvement on the technical solution of the dry fine sand grinding sand making machine of the utility model, an elastic wear-resistant ring piece is connected to the upper edge of the inner ring wall surface of the collecting hopper, which presses against the bottom surface of the moving grinding disc; the bottom surface of the collecting hopper is inclined, and a discharge port is arranged toward the outside at the lowest position of the collecting hopper.

[0014] As an improvement on the technical solution of the dry fine sand grinding sand making machine of the utility model, the feed hole is located at a position which is 250 mm away from the center of the fixed grinding disc.

[0015] The beneficial effect of the utility model is that the dry fine sand grinding sand making machine is driven by the reduction drive, and the movable grinding disc located on the lower side rotates, and cooperates with the fixed grinding disc on the upper side to shear and rub the materials between the two grinding discs, so as to achieve the crushing of the granular materials. The lower grinding disc is a movable grinding disc, which can rotate but cannot float / jump up and down, and cannot move axially; while the upper grinding disc is a fixed grinding disc, which is not fixedly installed, but floatingly installed, and cannot rotate, but can float up and down, and its upper and lower positions can be adjusted. The lower limit position of the fixed grinding disc is limited by the up and down movement adjustment of the distance limit pull rod, so as to adjust the gap between the movable grinding disc and the fixed grinding disc. The grinding disc gap is adjustable to meet the requirements of producing different material particle sizes. The larger the gap, the larger the particle size of the material produced, and the smaller the gap, the smaller the particle size of the material produced, so that the particle size of the finished product can be controlled. The larger the gap between the grinding discs, the greater the spring compression, and then the reaction force of the spring pushing the fixed grinding disc is greater, which is more beneficial for crushing materials with larger particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the forward cross-sectional structure of a dry fine sand grinding sand making machine of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged view of area A.

[0018] Figure 3 It is a schematic diagram of the disc structure of the moving grinding disc.

[0019] Figure 4 It is a schematic diagram of the perspective disc structure in which the movable grinding disc and the fixed grinding disc overlap. DETAILED DESCRIPTION

[0020] The specific implementation of the present utility model will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the utility model is a dry fine sand grinding sand making machine, which includes a mill bracket 11, a reduction drive machine 12 installed on the mill bracket 11, a movable grinding disc 22 with a disc surface facing upward installed on the mill bracket and driven to rotate by the reduction drive machine, a top cover plate 31 arranged on the top of the mill bracket, a fixed grinding disc 33 installed on the top cover plate 31 and located above the movable grinding disc, a distance limiting pull 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 for pressing the fixed grinding disc 33 downward, an annular cavity type collecting hopper 51 arranged around the periphery of the movable grinding disc 22, a feeding hole 38 provided on the fixed grinding disc 33, and a supply hopper 39 installed on the top cover plate 31 and docked with the feeding hole 38. Driven by the reduction drive 12, the movable grinding disc 22 on the lower side of the dry fine sand grinding sand making machine rotates, and cooperates with the fixed grinding disc 33 on the upper side to shear and rub the materials between the two grinding discs, so as to crush the granular materials. The lower grinding disc is the movable grinding disc 22, which can rotate but cannot float / jump up and down, and cannot move axially; while the upper grinding disc is the fixed grinding disc 33, which is not fixedly installed, but floatingly installed, and cannot rotate, but can float up and down, and its upper and lower positions can be adjusted. The lower limit position of the fixed grinding disc 33 is limited by the up and down movement of the distance limit pull rod 35, so as to adjust the gap between the movable grinding disc 22 and the fixed grinding disc 33. The gap between the grinding discs is adjustable to meet the requirements of producing different material particle sizes. The larger the gap, the larger the particle size of the material produced, and the smaller the gap, the smaller the particle size of the material produced. The particle size of the output material is adjusted by controlling the gap between the grinding discs, so that the particle size of the finished product can be controlled. The larger the gap between the grinding discs, the greater the spring compression, and the greater the reaction force of the pressure plate spring 36 pushing the fixed grinding disc 33, which is more beneficial for crushing materials with larger particle sizes. The lower grinding disc is a moving grinding disc 22, which rotates during operation and can exert a certain centrifugal force on the material it carries, forming a tendency to throw the material out, placing the material near the central position between the grinding discs, and better pushing the material to the periphery of the lower grinding disc.

[0022] The fine sand grinding equipment pre-adjusts the gap between the movable grinding disc 22 and the fixed grinding disc 33 according to the demand of the material particle size before working. During the working process, the fixed grinding disc 33 is pushed down by the pressure disc spring 36 to make the gap between the grinding discs approach the minimum gap, so that the material can be crushed by the grinding discs during the pushing process between the grinding discs to obtain material particles of a certain particle size, thereby reducing the energy consumption of the processing process. In addition, since the minimum gap between the grinding discs is controlled, the material processed by the grinding disc with a limited gap can be rolled a certain distance in the grinding disc to obtain a more rounded particle shape.

[0023] This type of fine sand grinding sand making machine has a fixed grinding disc on the upper part and a movable grinding disc on the lower part. The movable grinding disc 22 is driven by the motor and reducer at the bottom (the reduction drive machine 12 includes a motor 28 that generates motive power and a reducer 29 that plays a transmission role). The mill bracket 11 carries the drive system, grinding device, and crushing chamber at the same time. The one-piece design does not require additional foundation construction, making the machine small in size and low in power consumption. It can be arranged as a single unit or in groups of multiple units. Production companies only need to arrange them reasonably according to their own production capacity requirements and process the generated sand heads at any time.

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

[0025] Furthermore, the surfaces of the movable grinding disc 22 and the fixed grinding disc 33 are divided into a plurality of sectors, and the surfaces of the individual sectors are provided with tooth lines 23 that are parallel and extend to the circumferential surface of the grinding disc, so that a plurality of tooth line arrangement patterns with the same regularity can be constructed. During the rotation of the movable grinding disc 22, the tooth lines 23 of the two grinding discs cross into a scissor shape, so that the tooth edges of the tooth lines 23 can be used to apply shear force and friction force to the raw materials, so that the crushing efficiency is higher and the power consumption is lower. The tooth lines 23 extend to the circumferential surface of the grinding disc so that the material obtained by crushing and rolling falls from the edge. The extended profile of the tooth lines 23 can be a straight line, an arc, an S shape, etc.

[0026] Specifically, the tooth line 23 is parallel to the contour edge on one side of the sector, one of the tooth lines is arranged next to / along the contour edge, and the other tooth lines are laid out in parallel in sequence to form a group of tooth grooves side by side, and each tooth groove is opened on the circumference of the grinding disc for discharge. The tooth lines of all sectors are parallel to the contour edge on the same side, so that the arrangement rules of the tooth lines in each sector are the same, which facilitates the tooth lines of the two grinding discs to form a scissor shape with each other, and the entire grinding disc surface is formed with a shear structure covered with tooth edges intersecting each other. If the contour edge extends in a straight line, the contour edge is the radius of the moving grinding disc / fixed grinding disc.

[0027] Furthermore, the central angles of the sectors are the same, and the tooth lines of adjacent sectors overlap in rotation, that is, the tooth lines are evenly distributed, that is, the sectors are divided at equal angles in the circumferential direction of the fixed grinding disc 33 and the movable grinding disc 22, and are evenly partitioned, that is, the cross shear structure position points can be evenly distributed on the disc surface between the grinding discs, thereby making the crushing and rolling more uniform and the force on the grinding discs more balanced.

[0028] Among them, a discharge trough 25 is provided between the sectors, so that the material can be rolled and transferred between different sectors through the discharge trough 25, and the material that meets the particle size requirements can be pushed out between the discharge trough 25, so as to achieve the effect of evenly distributing the material.

[0029] Among them, on the front side when the fixed grinding disc 33 and the movable grinding disc 22 are opened and displayed to each other, the tooth lines 23 of the fixed grinding disc 33 and the movable grinding disc 22 have the same extension direction, that is, the tooth lines 23 of the fixed grinding disc 33 and the movable grinding disc 22 have the same extension trajectory. Then, when the fixed grinding disc 33 and the movable grinding disc 22 are assembled with each other, the disc surfaces of the fixed grinding disc 33 and the movable grinding disc 22 are exactly flipped 180 degrees symmetrically, so that the tooth lines 23 of the fixed grinding disc 33 and the movable grinding disc 22 form a shear angle with each other, and the shearing structural points are dispersedly arranged on the entire disc surface.

[0030] Among them, the fixed grinding disc 33 is fitted with a fixed grinding disc seat plate 32 on the upper side, and the fixed grinding disc seat plate 32 and the fixed grinding disc 33 are locked together by bolts, and the movable grinding disc seat plate 21 is fitted with the lower side of the movable grinding disc 22, and the movable grinding disc seat plate 21 and the movable grinding disc 22 are locked together by bolts, and the movable grinding disc seat plate 21 is fixedly connected to the output shaft 26 of the reduction drive 12; the limited distance pull rod 35 is a screw rod, one end of which is provided with an end cap and fixedly connected to the fixed grinding disc seat plate 32, and the other end of the screw rod passes through the top cover plate 31 and is spirally sleeved with a nut to adjust the length of the screw rod within the top cover plate 31. The length of the screw rod within the top cover plate 31 determines the gap between the fixed grinding disc 33 and the movable grinding disc 22, and the nut is located on the top cover plate 31, that is, the lifting and lowering of the screw rod can be adjusted by screwing the nut externally, thereby setting or changing the gap between the fixed grinding disc 33 and the movable grinding disc 22 to obtain materials with the required particle size.

[0031] The inner annular wall surface 52 of the collecting hopper 51 is located on the inner side of the lower edge of the outer circumferential surface of the moving grinding disc 22, so that the materials discharged from the periphery of the moving grinding disc 22 can directly fall into the collecting hopper 51, and the outer annular wall surface 53 of the collecting hopper 51 extends upward and forms a closed mill cavity with the top cover plate 31, so that the fixed grinding disc 33 and the moving grinding disc 22 are placed in the sealed cavity, which is more environmentally friendly. Of course, the moving grinding disc seat plate 21 of the moving grinding disc 22 can also serve as a partial wall of the mill cavity.

[0032] Furthermore, the upper edge of the inner ring wall surface 52 of the collecting hopper 51 is connected with an elastic wear-resistant ring sheet 55 that presses against the bottom surface of the moving grinding disc 22, thereby increasing the sealing of the mill cavity and better preventing dust from overflowing, and the detachable wear-resistant ring sheet 55 can be replaced when worn; the bottom surface of the collecting hopper 51 is inclined, and a discharge port 56 is arranged outward at the lowest position of the collecting hopper 51. Therefore, in general, the working principle of this model is that the grinding disc with a tooth line 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, and the material is driven by the lower grinding disc / moving grinding disc 22, moves along the grinding disc tangent direction and the tooth direction, and finally falls from the edge of the lower grinding disc / moving grinding disc 22 and is discharged through the inclined slot at the bottom of the mill cavity.

[0033] The feed hole 38 is located at a position 250 mm away from the center of the fixed grinding disc 33. The fixed grinding disc 33, i.e., the upper grinding disc, is provided with a feed hole 38, which penetrates the upper grinding disc and is set at a position 250 mm away from the center of the grinding disc to prevent the material from accumulating in the center of the grinding disc and being unable to be crushed, and at the same time, the retention time of the material in the mill is extended to the greatest extent.

[0034] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A dry fine sand grinding sand making machine, characterized in that: It includes a mill support, a reduction drive installed on the mill support, a movable grinding disc with its disc surface facing upwards, installed on the mill support and driven to rotate by the reduction drive, a top cover plate arranged on the top of the mill support, a fixed grinding disc installed on the top cover plate and located above the movable grinding disc, a distance limiting pull 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 for pressing the fixed grinding disc downward, an annular cavity-type collecting hopper arranged around the periphery of the movable grinding disc, a feeding hole arranged on the fixed grinding disc, and a supply hopper installed on the top cover plate and docked with the feeding hole.

2. The dry fine sand grinding sand making machine according to claim 1 is characterized in that: The surfaces of the movable grinding disc and the fixed grinding disc are configured as concave and convex tooth surfaces formed by tooth lines arranged side by side.

3. The dry fine sand grinding sand making machine according to claim 2 is characterized in that: The surfaces of the movable grinding disc and the fixed grinding disc are divided into a plurality of sectors, and the disc surface in a single sector is 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 is characterized in that: The tooth line is parallel to the contour edge on one side of the sector; the tooth lines of all sectors are parallel to the contour edge on the same side.

5. The dry fine sand grinding sand making machine according to claim 3 is characterized in that: The central angles of the sectors are the same, and the tooth lines of adjacent sectors overlap in rotation; and a discharge trough is provided between the sectors.

6. The dry fine sand grinding sand making machine according to claim 4 or 5, characterized in that: On the front side when the fixed grinding disc and the movable grinding disc are opened and 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 seat plate is fitted on 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 dynamic grinding disc seat plate is fitted on 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, and the movable grinding disc seat plate is fixedly connected to the output shaft of the reduction drive machine; the distance limiting pull rod is a screw rod, one end of which is provided with an end cap and fixedly connected to the fixed grinding disc seat plate, and the other end of the screw rod passes through the top cover plate and is spirally sleeved with a nut to adjust the length of the screw rod within the top cover plate.

8. The dry fine sand grinding sand making machine according to claim 1, characterized in that: The inner annular wall surface of the 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 annular wall surface of the collecting hopper extends upward and forms a closed grinding mill cavity with the top cover plate.

9. The dry fine sand grinding sand making machine according to claim 8, characterized in that: An elastic wear-resistant ring piece is connected to the upper edge of the inner ring wall surface of the collecting hopper to press against the bottom surface of the moving grinding disc; the bottom surface of the collecting hopper is inclined, and a discharge port is arranged outward at the lowest position of the collecting hopper.

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

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