JPS6128380B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention polishes crushed rock cut from mountains, crushed river gravel, slag (mine slag), etc. to remove sharp edges, and also removes mixed soil lumps and This invention relates to an aggregate grinding machine for obtaining high-quality gravel by crushing sand blocks and the like and removing adhering mud.

[Conventional technology]

In the past, natural gravel from riverbeds was collected and used as it was mainly for concrete aggregate, but recently it has become difficult to collect gravel from riverbeds, so crushed rock is artificially crushed using a crusher, etc., and used as conventional natural gravel. It is used in aggregate as a substitute for

As another conventional technology, for example,
The one described in Publication No. 3420 is known. this is,
A constant speed rotating drum having opposing end walls and arranged in a horizontal direction; a material feeding device for feeding material into one end of the drum approximately in the axial direction; and a device for taking out the crushed material from the drum. and a member having an outer circumferential surface portion made of a durable elastic material and rotated about an axis substantially coaxial with the rotational axis of the drum, the member being pivotally supported in the drum and rotating at high speed. a rotational impulse member which is spaced apart around the inner periphery of the drum at the outer periphery of the impulse member, and which engages and lifts the material introduced into the lower periphery of the drum and the upper periphery of the drum; The crusher is equipped with a material lifting device that raises the material toward the target and then drops the raised material onto the impulse member by gravity, wherein the rotating drum and the rotational impulse member are in a substantially concentric relationship. , and both rotate in the same direction.

As another conventional example, a crushing stone polishing apparatus described in Japanese Patent Application Laid-Open No. 50-86753 is known. This is for removing clods of soil and corners of crushed stones adhering to crushed stones by polishing crushed stones and other crushed stones, and as far as this is concerned, it has the same purpose as the present invention, but this conventional device The structure is such that a rotor with impact blades that rotates in the opposite direction to the rotating drum is placed inside a cylindrical rotating drum, and the center axis of the rotor with impact blades is coaxial with the center axis of the rotating drum. This is what was installed. and,
The crushed stones to be polished are scraped up by the impact blades of the rotor and collided with the upper inner wall of the drum, which is rotating in the opposite direction to the rotor. It is said that the soil clods attached to the parts or crushed stones are removed.

[Problem to be solved]

Artificially crushed crushed stone lacks the roundness required for high-quality concrete aggregate, and it is difficult to sufficiently remove mud. In addition, if squared crushed stone is used as aggregate, the corners will get stuck during transportation of concrete, resulting in a lack of fluidity and poor workability.Furthermore, when pumping up, the squared crushed stone will be left behind, resulting in large and small pieces. The crushed stone may not be scattered evenly, and there is also the risk that crushed stone may remain in the corners of the formwork during pouring, or that cement may not fully enter the dents of the crushed stone with corners, resulting in poor adhesion. Ta.
Therefore, from the perspective of effective use of limited natural resources, there is a strong need for a device that can further process crushed rock to remove the corners and completely remove residual mud etc. to obtain high quality gravel. I've reached it.

Also, the method described in Japanese Patent Publication No. 47-3420 is good for crushing materials into small particles, but when hard crushed stone for concrete is used as a material, the corners of the crushed stone are removed using a rotating impulse member such as a rubber tire. It is absolutely impossible to do so, and since there is almost no difference in the compressive force on the materials (there is almost no change in the reduction rate of the space occupied in the chamber in which the materials are rotated), it is unlikely that sufficient friction will occur between the materials. This is something that cannot be expected.

Furthermore, in the method described in Japanese Patent Application Laid-open No. 50-86753, the crushed stones are made to fly inside the rotating drum, so they collide with the upper inner wall of the drum or the crushed stones collide violently with each other. The crushed stone itself has been crushed and split before, making it even more angular. Furthermore, it takes a lot of time to remove the corners of the divided crushed stone, and the desired aggregate is not granular. The fatal flaw was that it had to be small.

[Means for solving problems]

The present invention was invented in view of the above circumstances, and aims to provide an aggregate polishing machine capable of producing high-quality gravel by polishing aggregates such as crushed stone and slag. It was configured as follows.

That is, the present invention includes a generally hollow cylindrical rotating drum that is rotationally driven in one direction, and an approximately hollow cylindrical rotating drum that is disposed eccentrically within the rotating drum and substantially parallel in the axial direction, and that rotates faster than the rotating drum in the opposite direction. a substantially cylindrical rotor that is rotationally driven in the direction; a plurality of scraping blades that are attached to the inner circumferential surface of the rotary drum along the axial direction thereof; and a plurality of scraping blades that are attached to the outer circumferential surface of the rotor along the axial direction. It consists of a plurality of stirring blades, and is characterized in that both the scraping blades and the stirring blades are not inclined in the opposite direction to the previous arrangement direction at the terminal end.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described based on the drawings. A rotary drum 1 having a hollow cylindrical shape is supported on a base 2 in a sideways state and rotatable in one direction. A cylindrical rotor 3 is eccentrically arranged. The rotor 3 and the rotating drum 1 are in a substantially parallel relationship in the axial direction, and the center axis of the rotor 3 is eccentric to that of the rotating drum 1, that is, they are not in a concentric relationship, but are at the center of the rotating drum 1 in FIG. It is located diagonally downward from An annular gear 4 is fixed at the center of the outer periphery of the rotating drum 1, and guide rings 5, 5 are fixed near both ends of the outer periphery, and these guide rings 5, 5 are arranged in pairs on the base 2. The rotating drum 1 is supported on the base 2 via the guide rollers 6, 6 and 6, 6, and the rotating drum 1 is smoothly rotated. It is starting to rotate. Further, a driving gear 7 is meshed with the annular gear 4, and the driving gear 7 is fixed to a driving shaft 9 of a motor 8.
As a result of the rotation, the rotary drum 1 is rotated in the direction of the arrow via the annular gear 4. Guide rollers 1 are provided on the outer surfaces of the guide rings 5, 5, respectively.
0, 10 and 10, 10 are in contact with each other, and these guide rollers 10, 10 and 10, 10 are connected to arms 11, 11 and 11, 11 installed at both ends of the base 2.
The rotary drum 1 is rotatably attached to the tip of the base 2 so that the rotary drum 1 is supported on the base 2 so as not to move in its diametrical and axial directions, and is rotated at a predetermined speed. One open end of the rotating drum 1 is narrowed toward the center to form an inlet opening 12, into which a chute 13 for introducing crushed stone with mud is exposed at its lower end. . The other open end of the rotating drum 1 is once narrowed toward the center and then opened in the shape of a wrapper, forming an outlet opening 14. At the lower part of the outlet opening 14 side, there is a discharge chute 17 supported by pillars 15, 15, which is inclined so as to gradually become lower toward the outside, and has a plurality of sieve holes 16. is located. The rotating drum 1
A plurality of raking blades 18 are attached to the inner circumferential surface of the pump in a gentle spiral shape from the inlet opening 12 to the outlet opening 14. The scraping blades 18 are attached to a fixed frame 19 fixed to the inner peripheral surface of the rotating drum 1, as shown in FIGS. 3 to 5. As shown in FIG. 4, a plurality of substantially triangular support plates 20 are attached to the fixed frame 19, and arc-shaped end surfaces 20a of these support plates 20 are attached to the inner peripheral surface of the rotating drum 1. It has been welded and fixed. The scraping blades 18 are made of a steel plate or the like having excellent wear resistance, and are screwed to the side surface of the fixed frame 19 so as to be replaceable. In addition,
The raking blades 18 and the fixed frame 19 are fixed in a slightly inclined state (about 10 degrees) with respect to the diameter l of the rotating drum 1 passing through the fixed portion. (See Figure 5).

On the other hand, the rotor 3 is fixed to a rotating shaft 21 passing through the rotating drum 1, and both ends of the rotating shaft 21 are supported by bearings 22, 22, which are connected to the inlet 12 of the rotating drum 1. and the outlet opening 14, respectively.
3,23. The rotating shaft 21
passes through the axial center of the rotor 3, and the rotating shaft 21 and the axial center of the rotor 3 are installed eccentrically from the axial center of the rotating drum 1 (see Fig. 2). A large diameter chain sprocket 24 is fixed, and a chain 28 is stretched between the chain sprocket 24 and a chain sprocket 27 of an output shaft 25 of a motor 25 fixed to the lower side of the support frame 23. There is. The rotating shaft 21 and rotor 3 are rotated in a direction opposite to the rotating direction of the rotating drum 1 and at a faster speed via the motor 25, chain sprockets 24, 27, and the like. Further, a large number of stirring blades 29 are attached to the outer peripheral surface of the rotor 3 along its axial direction. The stirring blade 29 is attached to a fixed frame 3 fixed to the outer peripheral surface of the rotor 3 as shown in FIGS. 6 to 8.
It is attached to 0. That is, as shown in FIG. 7, a plurality of substantially triangular support plates 3 are attached to the fixed frame 30.
1... are attached, and the arc-shaped end faces 31a... of these support plates 31... are attached to the outer peripheral surface of the rotor 3 and fixed by welding. The stirring blade 29 is
It is made of a steel plate or the like with excellent wear resistance, and its longitudinal side edge forms a swollen edge 29a that swells in the direction opposite to the rotational direction of the rotor 3, and the fixed frame 3
It is designed to be replaceably screwed onto the side of 0. When the stirring blade 29 is attached to the fixed frame 30, the swollen edge 29a is arranged to cover the upper end of the fixed frame 30. In addition,
The stirring blades 29 and the fixed frame 30 are fixed in a slightly inclined state (about 10 degrees) with respect to the diameter l of the rotor 3 passing through the fixed portion (see FIG. 8). In addition,
Instead of the discharge chute 17, a wire mesh cylinder 32 may be fixed to the edge of the outlet opening 14 of the rotating drum 1 as shown in FIG.

Next, the operation of the embodiment of the present invention will be explained.
First, the rotating drum 1 and the rotor 3 are rotated in opposite directions to each other, and water is added to crushed rock as needed, and the crushed stone is thrown into the rotating drum 1 from the chute 13. Then, the crushed stone is sent to the inlet end of the raking blades 18, and is raked up by these raking blades 18.
In Fig. 2, when it has been scraped up approximately 90 degrees clockwise from the lower end, it falls off the scraping blade 18 and falls, and due to the spiral slope of the scraping blade 18, it advances slightly toward the exit side. while falling. As the crushed stones continue to fall, the space between the scraping blades 18 and the stirring blades 29 of the rollers 3 is filled with crushed stones, and those at the bottom are scraped up and sent little by little towards the outlet opening 14. On the other hand, for crushed stone, the rotor 3 rotates in the opposite direction, so the stirring blades 29 move in the opposite direction to the raking direction.
...forcibly withdrawn. To explain in more detail, the point where the straight line distance between the inner circumferential surface of the rotating drum 1 and the outer circumferential surface of the rotor 3 is the shortest (near the 8 o'clock point when the circumference of the rotating drum 1 is likened to a clock in FIG. 2) ), the blades 18,
29 comes into play. That is, it acts within the space in the lower left half of the rotary drum 1 in FIG. The crushed stone located within the shortest distance between the rotating drum 1 and the rotor 3 is subjected to the maximum compressive force by the blades 18, 29. A smaller compressive force is applied to the crushed stone in locations other than this location, and the compressive force changes steplessly within the main action space (lower left half of Figure 2), and the crushed stone is exposed to different fields of compressive force. Thoroughly polished by rolling,
Sharp edges and deposits are removed without shattering. The reason why the compressive force changes steplessly is that the cylindrical rotor 3 is installed eccentrically at the lower part of the rotating drum 1, so that the inner wall (the inner wall) forming an arc of approximately one quarter of the rotating drum 1 is In Figure 2, rotating drum 1
This is because the distance from the circumference (between 6 o'clock and 9 o'clock) to the center of the rotor 3 differs at each location, and this difference in distance becomes the magnitude of the compressive force that acts on the crushed stone. . Of course, unless at least the lower half of the rotating drum 1 is filled with crushed stones, a sufficient compressive force cannot be expected.
In addition, the blades 18 and 29 function as scissors to shear crushed stones, and crushed stones that do not directly contact the blades 18 and 29 are also crushed stones that are rolled by the blades 18 and 29 or crushed stones that are held between the blades 18 and 29, respectively. Through this, rolling action is applied, and the mutual polishing action of the crushed stones is also performed.

The crushed stone polished in this way and washed with water when water is introduced is placed at the outlet opening 1 of the rotating drum 1.
4 and reaches the discharge chute 17 or wire mesh cylinder 32, where fine particles are sieved and drained.

In the embodiment described above, four guide rollers 10, 10,
10 was used, but as shown in FIG.
3 and 33, 33, it is also possible to prevent movement of the rotating drum 1.

Further, one open end of the rotating drum 1 is narrowed toward the center, and as shown in FIG.
. . . may be provided so that the crushed stone input from the input chute 13 can be reliably and quickly sent to the inlet end of the raking blades 18 by the rotation of these feeding blades 34 . Further, the degree of inclination of the spiral state can be changed freely, and the degree of inclination may be changed for each section. Furthermore, the shape of the single raking blade 18 may be formed into a wavy shape having a plurality of continuous ridges 18a... as shown in FIG.
A plurality of raking blades 18 having the following properties are fixed adjacent to each other in the circumferential direction and axial direction of the rotating drum 1,
It is also possible to form one continuous wave-shaped inner circumferential surface in the circumferential direction. When the raking blades 18 configured in this manner are fixed to the inner circumferential surface of the rotating drum 1, since they form a mountain shape and expand inward, crushed stones that have entered the valleys are not trapped there. , it can prevent untreated crushed stone from remaining. The wave-shaped scraping blades 18 are fixed so that the peaks 18a of the scraping blades 18, 18 adjacent to each other in the axial direction of the rotating drum 1 are shifted from each other as shown in FIG. For example, the crushed stone layer that is being scraped up is displaced, thereby further promoting the grinding action between the crushed stones.

〔effect〕

As explained above, according to the present invention, a substantially hollow cylindrical rotating drum that is rotationally driven in one direction;
a rotor that is eccentrically disposed within the rotating drum and substantially parallel in the axial direction, and that is driven to rotate faster than the rotating drum in the opposite direction; It consists of a plurality of raking blades attached to the rotor and a stirring blade attached to the outer peripheral surface of the rotor along its axial direction, so aggregates such as crushed stone and slag put into the rotating drum are stirred by the raking blades. The blades are polished by the mutual rubbing of the blades and crushed stones, and are subjected to different compressive forces in the rolling space to remove sharp edges and deposits without being crushed. The soil clods, sand clods, etc. that occur are crushed. It goes without saying that the gravel produced in this way can be used not only as aggregate but also as paving gravel for gardens, etc. Furthermore, according to the present invention, there is no need to form two or more chambers with different compressive forces, and different compressive forces can be applied to crushed stones etc. in the same chamber (in other words, inside the rotating drum), so the structure itself can be simplified. In addition, it can be made compact as a whole. Furthermore, the fundamental difference between the present invention and the conventional device in which crushed stone is made to fly and collide with each other in a rotating drum is that the present invention is fundamentally different from the conventional device in which crushed stone is made to fly and collide with each other in a rotating drum. A feature of the present invention is that the corners scrape off the clod without applying excessive crushing force, so there is no risk that the obtained aggregate will become excessively small, and more aggregates of a predetermined size or more can be obtained. Moreover, since the crushed stone is rarely broken, the time required to re-round the crushed crushed stone (which naturally has sharp edges) is saved, and a large amount of high-quality aggregate can be produced in a short period of time. Obtainable. Further, in the case where the raking blades are attached in a spiral manner, crushed stones, etc. can be transferred smoothly, and a large amount of crushed stones, etc. can be processed in a short period of time. On the other hand, if the scraping blade is installed approximately parallel to the axial direction of the rotating drum, the residence time of crushed stone etc. in the rotating drum will be longer.
Since the axial length of the rotating drum can be considerably shortened, it has the advantage of being more compact.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view, Fig. 2 is a partially cutaway front view, and Fig. 3 is a plan view of the rake blade developed.
Fig. 4 is an exploded perspective view of the raking blade, Fig. 5 is a sectional view of the raking blade, Fig. 6 is an expanded plan view of the stirring blade, Fig. 7 is an exploded perspective view of the stirring blade, and Fig. 8 is an exploded perspective view of the raking blade.
The figure is a cross-sectional view of the stirring blade, FIG. 9 is a partially cut-away side view showing a modification of the inlet and outlet openings of the rotating drum, and FIG. 10 is a modification of the guide roller. 11 is a sectional view showing a modified example of the raking blade, and FIG. 12 is a perspective view showing another attachment state of the raking blade shown in FIG. 11. 1... Rotating drum, 3... Rotor, 12... Inlet opening, 14... Outlet opening, 18... Scraping blade, 29... Stirring blade.

Claims (1)

[Scope of Claims] 1. A generally hollow cylindrical rotating drum that is rotationally driven in one direction, and a rotating drum that is eccentrically disposed within the rotating drum and substantially parallel in the axial direction, and that is faster than the rotating drum. a substantially cylindrical rotor that is rotationally driven in opposite directions; a plurality of scraping blades that are attached to the inner circumferential surface of the rotary drum along its axial direction; and a plurality of scraping blades that are attached to the outer circumferential surface of the rotor along its axial direction. What is claimed is: 1. An aggregate polishing machine comprising a plurality of stirring blades, characterized in that both the scraping blades and the stirring blades are not inclined in the opposite direction to the direction in which they were arranged up to that point at their terminal ends. 2 Scraping blades are installed in a spiral shape from the inlet opening side to the outlet opening side of the rotating drum, and a large number of stirring blades are installed along the axial direction of the rotor.
Claim 1, characterized in that crushed stone, slag, etc. in the rotating drum are transferred from the inlet opening side to the outlet opening side of the rotating drum by scraping blades attached in a spiral manner. Aggregate polishing machine. 3. Claim 1, wherein the rotor is arranged so that its eccentricity can be adjusted.
The aggregate polishing machine according to item 1 or 2.