JP3652664B2 - Concrete lump grinding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete lump grinding apparatus that removes cement mortar from aggregates by bringing concrete lump obtained from concrete waste into frictional contact with each other while applying compressive force.
[0002]
[Prior art]
Concrete waste, which accounts for a large proportion of construction waste, is reused as roadbed material and backfill material, but more advanced reuse methods for structural concrete aggregates are required. In order to reuse concrete waste as aggregate for structural concrete, the concrete blocks obtained by crushing them are brought into frictional contact with each other while applying compressive force (hereinafter this action is called grinding), It is necessary to remove the cement mortar from the aggregate.
[0003]
As an apparatus for grinding a concrete block in this way, for example, there is one described in JP-A-2001-239250. As shown in FIG. 4, this grinding apparatus is provided with a cylindrical rotor 52 that can be rotated eccentrically in a vertical cylindrical portion of a casing 51, and an annular grinding chamber 53 is provided between the vertical cylindrical portion and the cylindrical rotor 52. The lower part of this annular grinding chamber 53 is regulated by the discharge amount regulating plate 54, and the concrete block A filled in the grinding chamber 53 is converted into the radius of the grinding chamber 53 by the eccentric rotation of the cylindrical rotor 52. It grinds with the expansion and contraction of the direction gap, and removes the cement mortar content from the aggregate. In this apparatus, the grinding chamber 53 is filled with a medium B such as a steel ball together with the concrete block A in order to increase the compressive force during grinding.
[0004]
The discharge amount restricting plate 54 is installed so that the vertical position can be adjusted. By approaching the lower end of the grinding chamber 53, the filling density of the concrete block A in the grinding chamber 53 can be increased. It has become. Aggregate and cement mortar separated by grinding in the grinding chamber 53 are discharged from the lower end of the casing 51 to the hopper 55 and sieved by a vibrating sieve, a wind sieve or the like.
[0005]
[Problems to be solved by the invention]
In the conventional concrete lump grinding device described above, in order to increase the efficiency of removing cement mortar from the aggregate, the discharge restriction plate is brought close to the lower end of the grinding chamber, and the concrete lump in the grinding chamber is removed. If the packing density is increased, the lower end of the grinding chamber and the discharge amount regulating plate may be blocked.
[0006]
For this reason, the approaching amount of the discharge restriction plate to the lower end of the grinding chamber is restricted, and as it is, the removal efficiency of the cement mortar cannot be sufficiently increased. To compensate for this, the compressive force at the time of grinding is increased. The growing medium is filled together with the concrete mass. Since this medium needs to be separated from the resulting aggregate after being discharged from the grinding apparatus, a separate extra step is required.
[0007]
Then, the subject of this invention is providing the grinding device of the concrete lump which can obtain the removal efficiency of a high cement mortar part only by filling only a concrete lump.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a cylindrical rotor rotatably attached to an eccentric rotation shaft provided in a vertical cylindrical portion of a casing, and an annular grinding between the vertical cylindrical portion and the cylindrical rotor. A chamber is formed, and the lower part of the annular grinding chamber is regulated by a discharge amount regulating plate, and the concrete blocks filled in the grinding chamber are brought into frictional contact with each other while applying a compressive force by the eccentric rotation of the cylindrical rotor. In the concrete lump grinding device for removing the cement mortar content from the aggregate, the discharge restriction plate is attached to the cylindrical rotor, and the outer diameter side discharge end of the discharge restriction plate is connected to the vertical cylinder portion. A configuration in which the lower end inner periphery of the concrete block is set as a starting point and positioned outside the conical surface extending downward at the angle of repose of the concrete block is employed.
[0009]
That is, by attaching a discharge restriction plate to the cylindrical rotor and constantly shaking the discharge restriction plate by the eccentric rotation of the cylindrical rotor, the fluidity of the concrete block filled above by this shaking is increased, and the discharge amount Even if the regulating plate is brought close to the lower end of the grinding chamber and the packing density of the concrete block in the grinding chamber is increased, the gap between the lower end of the grinding chamber and the discharge amount regulating plate is not blocked. The grinding chamber is configured such that the outer diameter side discharge end of the discharge restriction plate is positioned outside the conical surface extending downward at the repose angle of the concrete lump from the lower end inner periphery of the vertical cylinder portion. This is to ensure that the discharge port at the lower end is always covered with a concrete lump and that sufficient residence time is required for grinding.
[0010]
By providing a weir projecting upward on the outer peripheral edge of the discharge amount restricting plate, the outer diameter of the discharge amount restricting plate is reduced, and the outer diameter side discharge end extends downward from the angle of repose. Can also be located outside.
[0011]
By allowing the vertical cylinder part of the casing to be raised and lowered, even if the space between the lower end of the grinding chamber and the discharge restriction plate is blocked, the operation of the grinding apparatus is stopped only by raising the vertical cylinder part. Without any obstruction. Also, by raising and lowering the vertical cylinder member, the spacing between the lower end of the grinding chamber and the discharge restriction plate is adjusted according to the particle size of the concrete mass to be ground, and the concrete bulk filling density in the grinding chamber Can also be adjusted.
[0012]
By providing a horizontal ring that protrudes into the grinding chamber on at least one of the inner and outer wall surfaces of the annular grinding chamber, the movement of the concrete mass in the annular grinding chamber is also controlled to some extent in the vertical direction. Restraining and expanding / contracting the radial gap of the grinding chamber by eccentric rotation of the cylindrical rotor generates a compressive force during the grinding not only in the radial direction but also in the vertical direction, and compression generated in these biaxial directions The removal efficiency of the cement mortar can be further increased by the action of the force. In addition, this horizontal ring may be provided in any number of stages up and down, and when provided in a plurality of stages, the protruding amount from the wall surface of the horizontal ring in each stage may be different.
[0013]
By making the horizontal ring detachable, the horizontal ring can be replaced with one having a different wire diameter and the amount of protrusion from the wall surface can be adjusted according to the particle size of the concrete block to be ground.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. 1 and 2 are the first embodiment. As shown in FIG. 1, in this concrete lump grinding apparatus, the upper part of the casing 1 is formed of a separate vertical cylindrical member 2, and the upper part of the rotating shaft 3 provided at the center of the casing 1 is the eccentric shaft part 3a. And inserted into the vertical cylindrical member 2, and the cylindrical rotor 4 is rotatably attached to the eccentric shaft portion 3 a by a bearing 5, and an annular grinding is performed between the vertical cylindrical member 2 and the cylindrical rotor 4. A chamber 6 is formed.
[0015]
The concrete block to be ground is fed from above the vertical cylindrical member 2 and filled in the grinding chamber 6. The cylindrical rotor 4 that forms the inner peripheral wall of the annular grinding chamber 6 includes an inner rotor 4a and an outer rotor 4b that also serves as a liner, and the lower side of the lower end of the outer rotor 4b is restricted to the lower side of the grinding chamber 6. An annular discharge restriction plate 7 is attached. The reason why the inclined surface to the outside is provided at the lower part of the cylindrical rotor 4 is to suppress the fall of the concrete block filled in the grinding chamber 6.
[0016]
A dam 7a protruding upward is provided on the outer peripheral edge of the discharge amount regulating plate 7, and the upper end of the weir 7a extends downward at the repose angle φ of the concrete lump starting from the inner periphery of the lower end of the vertical cylindrical member 2. It is located outside the entire circumference of the conical surface 7b. Therefore, the discharge port at the lower end of the grinding chamber 6 is always blocked with a concrete lump, and a sufficient residence time is required for grinding. In this embodiment, the repose angle φ of the concrete block is designed to be 35 °.
[0017]
The rotary shaft 3 is rotatably supported by a bearing 9 on a support portion 8 projecting inside the casing 1, and the rotational force of a motor 12 is transmitted to a pulley 10 attached to the lower end of the rotary shaft 3 via a V belt 11. It has become so.
[0018]
The vertical cylinder member 2 can be moved up and down by a hydraulic cylinder 13. Even if the lower end of the grinding chamber 6 and the discharge amount regulating plate 7 are closed, only the vertical cylinder member 2 is raised. The blockage can be eliminated without stopping the operation of the grinding device. Further, by raising and lowering the vertical cylindrical member 2, the interval between the lower end of the grinding chamber 6 and the discharge amount regulating plate 7 is adjusted according to the particle size of the concrete block to be ground, and the inside of the grinding chamber 6 is adjusted. It is also possible to adjust the packing density of the concrete block.
[0019]
The concrete block filled in the grinding chamber 6 is ground by the eccentric rotation of the cylindrical rotor 4, and the cement mortar is removed from the aggregate. The aggregate and cement mortar separated by this grinding fall downward from the outer periphery of the discharge amount regulating plate 7 and are discharged from the discharge port 14 onto the discharge conveyor 15. Aggregates and cement mortar discharged from the discharge conveyor 15 are sieved by a vibrating screen, a wind screen, or the like.
[0020]
Next, the grinding action in the grinding chamber 6 will be described with reference to FIG. The center P of the eccentric shaft portion 3a makes one round on the circle A having a radius of the amount of eccentricity δ from the center O of the rotating shaft 3 by one rotation of the rotating shaft 3, and accordingly, the cylindrical rotor 4 The outer peripheral point Q also makes one round on the circle B having the same radius as the circle A, and the cylindrical rotor 4 performs a pivoting motion between the position indicated by a two-dot chain line in the drawing. Therefore, the radial gap of the annular grinding chamber 6 continuously expands and contracts at each circumferential position.
[0021]
Since the rotary shaft 3 rotates at a high speed of about 500 rpm, the cylindrical rotor 4 also turns about 500 times per minute, and the radial gap of the grinding chamber 6 expands and contracts at high speed. Therefore, the concrete blocks filled in the gap expanding and contracting at high speed are brought into frictional contact with each other while receiving the compressive force, and the cement mortar is removed from the aggregate.
[0022]
The cylindrical rotor 4 rotatably attached to the eccentric shaft portion 3a is restricted in rotation by a concrete lump filled in the grinding chamber 6, so that the rotation of the rotating shaft 3 is accompanied by the flow of the concrete lump. It rotates at a low speed of 1/10 or less of the speed. The rotation of the cylindrical rotor 4 often occurs in the direction opposite to the rotation direction of the rotary shaft 3.
[0023]
Since the discharge amount regulating plate 7 is attached to the cylindrical rotor 4, the discharge amount regulating plate 7 rotates at a high speed together with the cylindrical rotor 4. Therefore, since the fluidity of the concrete block filled above the discharge amount restriction plate 7 is enhanced by the shaking caused by this turning motion, the discharge amount restriction plate 7 is brought close to the lower end of the grinding chamber 6, and the grinding chamber Even if the filling density of the concrete block in 6 is increased, the space between the lower end of the grinding chamber 6 and the discharge restriction plate 7 is not blocked.
[0024]
FIG. 3 shows a second embodiment. The concrete lump grinding apparatus has the same basic structure as that of the first embodiment, and the grinding chamber 6 is provided on the outer periphery of the cylindrical rotor 4 forming the inner peripheral wall of the annular grinding chamber 6. The only difference is that the horizontal ring 16 protruding inward is provided in a plurality of stages in the vertical direction. The other parts are the same as those in the first embodiment, and are therefore denoted by the same reference numerals as in FIG.
[0025]
Therefore, in this embodiment, the movement of the concrete lump in the annular grinding chamber 6 is restricted to some extent in the vertical direction by the horizontal ring 16 protruding into the grinding chamber 6, and grinding due to the eccentric rotation of the cylindrical rotor 4. The expansion and contraction of the gap in the radial direction of the crushing chamber 6 generates a compressive force at the time of grinding not only in the radial direction but also in the vertical direction. Can be further enhanced.
[0026]
Each of the horizontal rings 16 is fixed to a plurality of vertical bars 18 suspended from an annular plate 17 attached to the upper end of the cylindrical rotor 4. Each horizontal ring 16 can be attached to and detached from the cylindrical rotor 4 together with the annular plate 17, and the horizontal ring 16 is replaced with one having a different wire diameter according to the particle size of the concrete lump to be ground. The amount of protrusion into the grinding chamber 6 can be adjusted.
[0027]
In this embodiment, the horizontal ring 16 is provided on the outer periphery of the cylindrical rotor 4 and protrudes from the inner peripheral side of the annular grinding chamber 6. However, the horizontal ring 16 is provided on the inner periphery of the vertical cylindrical member 2 and is ground. You may protrude from the outer peripheral side of the chamber 6. FIG. Of course, the grinding chamber 6 may be protruded from both inner and outer peripheral sides.
[0028]
【The invention's effect】
As described above, the concrete lump grinding apparatus according to the present invention is provided with a discharge amount restriction plate for restricting the lower part of the annular grinding chamber attached to the cylindrical rotor, and the discharge amount restriction plate is formed by eccentric rotation of the cylindrical rotor. By always shaking, the outer diameter side discharge end of the discharge restriction plate is positioned outside the conical surface extending downward at the angle of repose of the concrete block starting from the inner periphery of the lower end of the vertical cylinder part, Even if the discharge restriction plate is moved closer to the lower end of the grinding chamber and the packing density of the concrete block in the grinding chamber is increased, the gap between the lower end of the grinding chamber and the discharge restriction plate is not blocked, and the grinding chamber Since the bottom outlet is always closed with concrete lumps, the cement mortar can be removed from the aggregate simply by filling the concrete lumps with sufficient retention time for grinding. Efficiency can be increased.
[0029]
Further, by providing a horizontal ring protruding into the grinding chamber on at least one of the inner and outer wall surfaces of the annular grinding chamber, the movement of the concrete mass in the annular grinding chamber can be moved in the vertical direction. Constrained to a certain extent, the radial gap of the grinding chamber is expanded and contracted by eccentric rotation of the cylindrical rotor, so that the compression force at the time of grinding is generated not only in the radial direction but also in the vertical direction. The removal efficiency of the cement mortar can be further increased by the action of the force.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a concrete lump grinding apparatus according to a first embodiment. FIG. 2 is a plan sectional view for explaining the grinding action in the grinding chamber of FIG. Fig. 4 is a partially omitted vertical cross-sectional view showing a concrete lump grinding apparatus. Fig. 4 is a vertical cross-sectional view showing a conventional concrete lump grinding apparatus.
DESCRIPTION OF SYMBOLS 1 Casing 2 Vertical cylinder member 3 Rotating shaft 3a Eccentric shaft part 4 Cylindrical rotor 4a Inner rotor 4b Outer rotor 5 Bearing 6 Grinding chamber 7 Discharge amount control plate 7a Weir 7b Conical surface 8 Supporting part 9 Bearing 10 Pulley 11 V belt 12 Motor 13 Hydraulic cylinder 14 Discharge port 15 Discharge conveyor 16 Horizontal ring 17 Annular plate 18 Vertical bar

Claims (5)

A cylindrical rotor is rotatably attached to an eccentric rotation shaft provided in the vertical cylindrical portion of the casing, and an annular grinding chamber is formed between the vertical cylindrical portion and the cylindrical rotor. Concrete that removes cement mortar from its aggregate by restricting the concrete mass filled in the grinding chamber by frictional contact with each other while applying compressive force by the eccentric rotation of the cylindrical rotor In the lump grinding device, the discharge restriction plate is attached to the cylindrical rotor, and the discharge angle restriction plate has an outer diameter side discharge end as a starting point from the inner periphery of the lower end of the vertical cylinder portion. A concrete lump grinding device characterized by being positioned outside a conical surface extending downwardly at the bottom. The concrete lump grinding device according to claim 1, wherein a weir protruding upward is provided at an outer peripheral edge of the discharge amount regulating plate. The concrete lump grinding apparatus according to claim 1 or 2, wherein the vertical cylindrical portion of the casing can be moved up and down. The concrete lump grinding apparatus according to any one of claims 1 to 3, wherein a horizontal ring projecting into the grinding chamber is provided on at least one of the inner circumferential surface and the outer circumferential wall of the annular grinding chamber. The concrete lump grinding device according to claim 4, wherein the horizontal ring is detachable.

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