JPH08192065A - Centrifugal crushing and particle size regulating device and method thereof - Google Patents

Abstract

PURPOSE: To prevent the growth and swelling of a crushed particle piled layer by the use of a small quantity of water and to circulate and use the using water to solve a problem on water treatment. CONSTITUTION: A device consists of a crushing chamber 19 surrounding a rotor 11 for discharging particles to be crushed, a storing floor 12 for storing crushed particles on the floor surface, and a water feeding pipe 32 for positioning a water feeding port 33 in a crushed particle piled layer in which crushed particles are piled on the floor surface of the storing floor 22 formed provided with an inclined surface S in the shape of an inverted conical surface having an angle of repose from a top located in the inner surface of an outer peripheral wall 21 toward an inner edge 23, and prevents the swelling and growth of the crushed particle piled layer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a centrifugal crushing and sizing machine and a centrifugal crushing and sizing method. More specifically, a centrifugal crushing granulator and a centrifugal crusher of a type in which water is flown to the upper layer of the crushed granules in order to avoid expansion of the upper layer of the crushed granules discharged from the rotor and formed on the floor surface of the crushing chamber above a certain level. Regarding the sizing method.

[0002]

2. Description of the Related Art Aggregates of concrete for construction, paving stones for stabilizing railway sleepers, intermediate products for producing sand, etc. are required in various fields, so rock granules obtained by crushing various rocks such as granite Are made according to the grain size. A centrifugal crushing and sizing machine is used to further crush the crushed particles that have been primary crushed to adjust the particle size.

The centrifugal crushing and sizing machine is a machine for crushing particles to be crushed, which are put into the rotor by a centrifugal force from the rotor, against the wall around the rotor. A floor is provided at the bottom of the crushing chamber. The crushed crushed particles are piled up on the floor surface of this floor to form a crushed particle upper layer. The crushed particles discharged from the rotor collide with the inner peripheral surface of the crushed particle upper layer, and crush each other.

Such a crushed grain upper layer gradually grows and bulges inward. Too much bulge causes the inside of the bulge to hit the rotor and the crushing action will not be performed, resulting in an unexpected situation of destroying the crushing chamber.

A centrifugal crushing and sieving machine which solves the above problems is known. For example, the centrifugal crushing and sizing machine disclosed in Japanese Utility Model Publication No. 2-36594 has a tapered slope (dead bed surface) formed inside the upper layer of crushed particles.
A water supply means is provided to allow water to flow down to wash away the crushed particles on the slope.

In such a centrifugal crushing and sieving machine which uses a large amount of water for washing off, the crushed crushed particles become drips and the post-treatment is troublesome. In addition, wastewater treatment is necessary to prevent the work site from becoming flooded, but there is no hand to treat the wastewater and it is a drain.

[0007]

The present invention has been made based on such a technical background, and achieves the following objects.

An object of the present invention is to provide a method for preventing growth swelling of a crushed grain upper layer by using less water.

It is an object of the present invention to solve the water treatment problem by recycling the water used.

[0010]

[Means for Solving the Problems] To solve the above problems, the following means are adopted.

The centrifugal crushing and sizing machine according to the first aspect of the present invention is a rotor (11) for discharging the charged crushed particles from the outer peripheral edge.
And a crushing chamber (19) surrounding the rotor (11), and an outer peripheral wall (2) that constitutes the crushing chamber (19) and surrounds the rotor.
1) and the crushing chamber (19) and the outer peripheral wall (2
A storage bed (1) provided below the inside of (1) and storing the crushed particles discharged from the rotor (11) and crushed on the floor surface.
2), a drop hole (24) for dropping the crushed particles from the inner edge (23) of the storage bed (12), and the crushed particles stacked on the floor surface of the storage bed (12) to form the outer peripheral wall. The inner edge (23) from the top located on the inner surface of (21)
Water supply pipe (32) in which a water supply port (33) is positioned in a crushed grain upper layer (M) formed with an inverted conical slope (S) having an angle of repose (θ) toward Consists of.

The centrifugal crushing and granulating machine according to the second aspect of the present invention is characterized in that, in the first aspect, it comprises water supply amount adjusting means (34) for adjusting the water supply amount.

The centrifugal crushing and sizing machine according to the third aspect of the present invention is characterized in that, in the first aspect, the water supply port (33) is located inside the top of the crushed grain upper layer (M). There is.

The centrifugal crushing and sizing machine according to the fourth aspect of the present invention is the centrifugal crushing and sizing machine according to the first aspect of the present invention, which is selected from the above-mentioned first, second, and third aspects and flows out from the water supply port (33) and permeates into the crushed particle upper layer (M). Water absorption port (4) that collects and absorbs water flowing down to the lower layer
Water absorption pipe (48) provided with 7), and said water supply pipe (3)
3) and the water absorption pipe (48), which is characterized by comprising a circulation means (42, 43) for circulating water.

In the centrifugal crushing and sizing method of the present invention 5, the crushed particles discharged from the rotor (11) are crushed by hitting the peripheral wall (21) surrounding the rotor (11) and crushed, and the crushed particles crushed by the crushing. The floor (12) below the peripheral wall (21)
Crushed grain upper layer (M) having a slope (S) is formed by stacking on the floor surface of the crushed particle and the crushed grain upper layer (M) is formed.
The crushed particles discharged from the rotor (11) are crushed by hitting the slope (S) of the above (1) to form a water flow layer in the water flow flowing down onto the slope (S) of the crushed particle upper layer (M). Water is contained in the crushed grain upper layer (M) at a water content ratio of no content.

It should be noted that, in the description of the above-mentioned configuration, the same reference numerals of the constituent elements of the embodiment described below are attached to the same reference numerals in parentheses to clarify the correspondence between the present invention and the embodiment. However, the present invention is not limited to the examples.

[0017]

In the centrifugal crushing and sizing apparatus and the centrifugal crushing and sizing method of the present invention, crushed particles are piled up on the floor surface to form a crushed particle upper layer. The crushed grain upper layer has a sliding surface formed inside. The inclination angle of the sliding surface, that is, the angle of repose is determined by various factors such as the particle size distribution, the viscosity of the crushed particle laminate according to the water content, the acceleration of gravity, the stacking height, the specific gravity of the crushed particles, and the like. The water content has a smaller angle of repose. This is because the fluidity increases and the crushed grains in the outermost layer along the slope become slippery along the slope, and the growth and swelling of the crushed grain upper layer to the inside stops. When the water content becomes too high, the angle of repose becomes too small and the slope is not formed. The amount of water supplied is adjusted so that the water content becomes appropriate depending on the particle size and the type of rock. The water used is circulated.

[0018]

【Example】

(Embodiment 1) Next, an embodiment of the present invention will be described.
First Embodiment FIG. 1 is a front sectional view showing a first embodiment of the present invention. The details of the crushing structure of the crushing and sizing machine 1 are as follows:
The detailed description of the publication will be given below, but a brief description will be given below.
At the ceiling of the crushing and sieving machine main body 2, there are provided charging ports 3 and 3 into which the crushed stone particles subjected to the primary and secondary crushing are charged.

A rotary drive shaft 5 is rotatably supported on the floor structure plate 4 of the crushing and sizing machine body 2 coaxially with the charging port 3. A first rotor 6 for primary crushing and sizing is firmly attached to the top of the rotary drive shaft 5 by a boss 7.

As shown in FIG. 2, the first rotor 6 is provided with a disc-shaped structural board 8. The structure board 8 has a plurality of crushed stone discharging arms 9, 9, 9, 9 for discharging crushed stones to the outer ring-shaped zone.
Are attached at equal angular intervals. As shown in FIG. 1, a second rotor 11 for secondary crushing and sizing is attached to a rotary drive shaft 5 below the first rotor 6.

As shown in FIG. 3, the second rotor 11 has a disk-shaped structural board 12. The structure board 12 includes a plurality of crushed stone discharging arms 13, 1 for discharging crushed stones to the outer annular zone.
3, 13, 13 are attached at equal angular intervals.

As shown in FIG. 1, a first crushing chamber 14 is provided so as to surround the first rotor 6 in the center. The 1st crushing chamber 14 is comprised by the outer peripheral wall 15 which is a cylindrical casing which forms an outer peripheral wall, and the storage floor 16 formed by a ring-shaped floor plate. The inner edge 17 of the storage floor 16 is circular. The inner edge 17 surrounds the first rotor 6 and
A ring-shaped hole is formed between the first rotor 6 and the first rotor 6, and this hole is formed as a drop hole 18 for allowing the crushed stone particles to drop downward. Below the drop hole 18, the structure board 1
2 is located.

A second crushing chamber 19 is provided so as to surround the second rotor 11 in the center. The second crushing chamber 19 is composed of an outer peripheral wall 21 which is a cylindrical casing and a storage floor 22 which is formed of a ring-shaped floor plate. Crushing and sizing machine body 2
The inner edge 23 of is circular. The inner edge 23 is the second rotor 1
1, a ring-shaped hole is formed between the inner edge 23 and the second rotor 11, and this hole is formed as a drop hole 24 for allowing the crushed stone particles to drop downward.

Between the second rotor 11 and the drop hole 18, the crushed particles that have undergone the primary crushing and sizing in the first crushing chamber 14 are put into the structure board 1.
A second input port 25 for guiding and guiding to 2 is provided. The technical significance of the second charging port 25 will be described when explaining the operation.

The first supply port 27 of the first water supply pipe 26 is provided at one or a plurality of positions at the design height determined by the design of the outer peripheral wall 15. The first supply port 27 is open on the inner surface side of the outer peripheral wall 15. The other end of the first water supply pipe 26 is connected to the bottom of the water supply tank 28.
A flow rate adjusting valve 29 for adjusting the flow rate is provided in the first water supply pipe 26. The flow rate adjusting valve 29 is provided with a manual handle 31 for adjusting the flow rate.

The second supply port 33 of the second water supply pipe 32 is provided at one or a plurality of positions at the design height determined by the design of the outer peripheral wall 21. The second supply port 33 is open on the inner surface side of the outer peripheral wall 21. The other end of the second supply port 33 is connected to the bottom of the water supply tank 28. A flow rate adjusting valve 34 for adjusting the flow rate is provided at the second supply port 33. The flow rate adjusting valve 34 is provided with a manual handle 35 for adjusting the flow rate.

The water in the water supply tank 28 has an automatically adjusted water surface 36. An overflow drain pipe 37 is provided so as to automatically form the automatically adjusted water surface 36. The height position of the water surface of the water supply tank 28 is determined by the opening position of the overflow drain pipe 37 in the wall of the water supply tank 28. The other end of the overflow drain pipe 37 is connected to the filter 38.

A water recovery tank 39 for recovering water is provided below the filter 38. The water filtered by the filter 38 is recovered in the water recovery tank 39. An electric motor 41 is provided above the water supply tank 28. The water pump 42 is driven by the electric motor 41. Water pump 42
A pumping pipe 43 is provided between the suction side and the bottom of the water recovery tank 39. A water supply pipe 44 is provided between the discharge side of the water pump 42 and the upper portion of the water supply tank 28.

An opening 45 for absorbing water is formed on the inner surface of the storage floor 16.
(See FIG. 4) is provided with a water absorption pipe 46 for absorbing water. The other end of the water absorption pipe 46 is connected to the overflow drain pipe 37. On the inner surface of the storage floor 22, a water absorption opening 47 (see FIG. 5) is opened and a water absorption pipe 48 for absorbing water is provided. The other end of the water absorption pipe 48 is connected to the overflow drain pipe 37.

Next, the operation and action of the first embodiment and the crushed stone sizing method will be described. The rotary drive shaft 5 is rotated at a high speed by a driving means (not shown). The crushed stone is put into the structure board 8 of the first rotor 6 which rotates at a high speed through the charging port 3. Structure board 8
A large number of crushed stones thrown in from above form a rotating flow by the plurality of crushed stone discharge arms 9 of the first rotor 6.

The crushed stone of high speed flow is discharged from the first rotor 6 in a direction at a certain angle with respect to the tangential direction while receiving a centrifugal force. The crushed stones thus discharged collide with the inner peripheral surface of the outer peripheral wall 15 at the beginning and are crushed, so that the average particle diameter becomes smaller. As shown in FIG. 4, the storage floor 16
Stacked on the surface. Over time, a crushed grain upper layer M is formed.

The morphology of the crushed grain upper layer M has a slope S determined by factors such as the particle size distribution of the crushed stone, the specific gravity of the crushed stone, and the acceleration of gravity. The slope S is generally an inverted conical surface. The angle between the straight line on the cross section of the slope S and the horizontal plane is referred to as the slip angle θ or the angle of repose θ.

Depending on the particle size distribution of the non-spherical crushed stone, such a clean sliding angle cannot be obtained. For example, in the crushed grain upper layer M, the central portion bulges toward the rotor 6 side and projects,
A bulge is formed and such a bulge grows and approaches the rotor. The crushed stone discharged from the first rotor 6 at high speed causes an unexpected accident in which the crushed stone in the bulging portion is scattered to destroy the crushing chamber 14.

The present invention stops the growth of the bulging portion in order to avoid such an accident. As shown in FIG. 4, the first supply port 2 of the first water supply pipe 26 is provided at the top of the crushed grain upper layer M.
Position 7. The theory of calculating the position of the first supply port 27 from the particle size distribution of crushed stone, the specific gravity of crushed stone, etc. is known in the field of mining science, but such a position is preferably determined by an actual machine. First for each model according to the particle size distribution of crushed stone
The position of the supply port 27 is changed. It is also possible to design the position of the first supply port 27 to be variable.

From the first supply port 27, a constant flow rate of water is supplied into the crushed grain upper layer M. Although it may be supplied from above the crushed particle upper layer M, the supply start position for the crushed particle upper layer M is the upper layer portion of the crushed particle upper layer M. The amount of such supply is determined by the height of the water surface in the water supply tank 28 (the height with respect to the first supply port 27) and the valve opening degree of the manual handle 31 of the flow rate adjusting valve 29. A constant flow rate is determined by the flow rate adjusting valve 29.

The water supplied to the top from the upper layer to the lower layer in the upper layer M of the crushed granules permeates to the lower layer due to the action of gravity and the action of osmosis, and the crushed stones are half floated in the water. buoyancy,
The shape of the slope S of the crushed grain upper layer M having a constant water content to which the action of osmotic pressure is applied is determined by the particle size distribution, the specific gravity of the crushed stone, the buoyancy and the osmotic pressure. The slope S approaches a slope shape calculated by theoretical calculation, and approaches an inverted conical surface having a slip angle θ. Almost no bulge is formed in the crushed grain upper layer M having a constant water content.

The crushed stone discharged from the first rotor 6 upon hitting the slope S is primarily crushed. The primary crushed stones flow down the slope S and are temporarily stored in the second charging port 25. The crushed stone that has been primary crushed by sliding on the slope formed in the same manner at the second charging port 25 is charged to the second charging port 25.

A large number of crushed stones that have been charged into the second charging port 25 from above form a rotating flow by the plurality of crushed stone discharging arms 13 of the second rotor 11. The crushed stone of the high-speed flow is discharged from the second rotor 11 in a direction at an angle with respect to the tangential direction while receiving a centrifugal force.

The crushed stone thus discharged collides with the inner peripheral surface of the outer peripheral wall 21 at the beginning and is crushed, so that the average particle diameter becomes small. As shown in Fig. 5, the crushed stone is like a mountain and the storage floor 2
Stacked on the second side. Over time, a crushed grain upper layer M is formed. The crushed grain upper layer M has a slope S determined by factors such as the particle size distribution of the crushed stone, the specific gravity of the crushed stone, and the acceleration of gravity.

As shown in FIG. 5, the second supply port 33 of the second water supply pipe 32 is positioned at the top of the crushed grain upper layer M. It is preferable to determine such a position on an actual machine. The position of the second supply port 33 is changed for each model according to the particle size distribution of crushed stone. It is also possible to design the position of the second supply port 33 to be variable.

A constant flow rate of water is supplied into the crushed grain upper layer M from the second supply port 33. Although it may be supplied from above the crushed particle upper layer M, the supply start position for the crushed particle upper layer M is the upper layer portion of the crushed particle upper layer M. The supply amount of such a supply is determined by the height of the water surface in the water supply tank 28 (second
Height with respect to the supply port 33) and the degree of valve opening of the flow rate adjusting valve 34 by the manual handle 35. Flow rate adjustment valve 3
The constant flow rate is determined by 4.

The water supplied to the top from the upper layer to the lower layer in the crushed-grain pile upper layer M permeates to the lower layer by the action of gravity and the action of osmosis, and the crushed stones are half floated in the water. buoyancy,
The shape of the slope S of the crushed grain upper layer M having a constant water content to which the action of osmotic pressure is applied is determined by the particle size distribution, the specific gravity of the crushed stone, the buoyancy and the osmotic pressure.

In the crushed grain upper layer M having a constant water content, almost no bulging portion is formed. The slope S has an inverted conical surface shape as described above. The secondary crushed and crushed crushed stone that has slid on the slope S and dropped from the drop hole 24 is discharged out of the machine by a lower conveyor (not shown), and is circulated to the input port of the next crushed and sized granulator or the input port 3 of the same machine. It

The water that has penetrated into the crushed grain upper layer M and has flowed downward is absorbed in the water absorbing openings 45 and 47, respectively, as shown in FIGS. Water absorption opening 4
5 and the water absorbed through the water absorbing opening 47 is filtered in the crushed grain upper layer M while being incomplete.

The filtered water absorbed through the water absorbing opening 45 and the water absorbing opening 47 is guided by the water absorbing pipe 46 and the water absorbing pipe 48, respectively, and merges with the overflow drain pipe 37, and then flows into the filter 38. enter. The filtered water filtered by the filter 38 drops into the water recovery tank 39. Water recovery tank 3
The filtered water in 9 is pumped up by the water pump 42 and circulates to the water supply tank 28.

(Second Embodiment) FIG. 6 shows a second embodiment. The technique tubes are extended in the central direction from a plurality of locations of the annular second water supply pipe 32 (and the first water supply pipe 26), and openings are provided in the outer peripheral wall 21. On the cylindrical surface of the outer peripheral wall 21, a plurality of supply holes 52 for supplying water into the crushed grain upper layer M at equal angular intervals are opened as open ends of the technique tube. By setting the number of supply holes 52 to an appropriate number, the water content in the crushed grain upper layer M is maintained constant.

A large number of water absorption openings 47 (and water absorption openings 45) are opened in the storage floor 22 (and the storage floor 16). An absorption container 53 is provided on the lower surface of the storage floor 22. The water absorbing opening 47 is opened in the absorbing container 53. A water absorbing fiber 54 is inserted into the absorption container 53. The open end of the water absorbing pipe 48 (and the water absorbing pipe 46) is in contact with the water absorbing fiber 54. Such a water absorbing fiber 5
When 4, the water content in the crushed grain upper layer M is easily maintained constant.

(Other Examples) Examples of the centrifugal crushing and sizing machine and the centrifugal crushing and sizing method of the present invention are not limited to the above-mentioned examples. For example, the recirculation means of the first embodiment includes a crushed grain upper layer M, a water pump 42, a pumping pipe 43, a water absorbing opening 47,
It is composed of a water absorption pipe 48 and an overflow drain pipe 37, but if the amount of water used is small, the water pump 4
2, a water recovery tank 39 with a bucket without using the pumping pipe 43
It can carry water.

The amount of supplied water can be adjusted by adjusting the height of the water supply tank 28 or the height of the automatically adjusted water surface 36 without using the flow rate adjusting valve 29 and the flow rate adjusting valve 34. The rotor may be a one-stage type instead of a two-stage type, and in this case, two particle size crushers may be used in series.

[0050]

INDUSTRIAL APPLICABILITY The centrifugal crushing and sieving machine and the centrifugal crushing and sizing method of the present invention use less water, so that water treatment is easy.
In some cases no water treatment is required. Product crushed stones with low water content have high commercial value. High crushing efficiency. The amount of water supply can be optimized according to the type and size of rock.

[Brief description of drawings]

FIG. 1 is a front sectional view showing Example 1 of a centrifugal crushing and sizing machine of the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a plan cross-sectional view at a different position in FIG.

FIG. 4 is a sectional view for explaining the operation.

FIG. 5 is a sectional view for explaining the operation.

FIG. 6 is a front sectional view showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Crushing and sizing machine 2 ... Crushing and sizing machine main body 3 ... Input port 5 ... Rotation drive shaft 6 ... 1st rotor 11 ... 2nd rotor 14 ... 1st crushing chamber 15 ... Outer peripheral wall 16 ... Storage floor 17 ... Inner edge 19 ... 2nd crushing chamber 21 ... Outer peripheral wall 22 ... Storage floor 23 ... Inner edge 24 ... Drop hole 25 ... 2nd input port 26 ... 1st water supply pipe 27 ... 1st supply port 28 ... Water supply tank 29 ... Flow rate Adjusting valve 31 ... Manual handle 32 ... Second water supply pipe 33 ... Second supply port 34 ... Flow rate adjusting valve 35 ... Manual handle 42 ... Water pump 43 ... Pumping pipe 47 ... Water absorbing port 48 ... Water absorbing pipe θ ... Rest Corner S ... Slope M ... Shattered grain upper layer

Claims (5)

[Claims] 1. A rotor (11) for discharging charged crushed particles from an outer peripheral edge, a crushing chamber (19) surrounding the rotor (11), and the crushing chamber (19) constituting the rotor. And the outer peripheral wall (21) surrounding the outer peripheral wall (21), which constitutes the crushing chamber (19), is provided below the outer peripheral wall (21) and is stored below the crushed particles discharged from the rotor (11) and crushed on the floor surface. A storage bed (22), a drop hole (24) for dropping crushed particles from the inner edge (23) of the storage bed (22), and crushed particles piled up on the floor surface of the storage bed (22). A crushed grain upper layer (M) having an inverted conical slope (S) having a repose angle (θ) from the top located on the inner surface of the outer peripheral wall (21) to the inner edge (23). ) With a water supply pipe (32) in which the water supply port (33) is located Crushing and sizing machine. 2. The centrifugal crushing granulator according to claim 1, further comprising a water supply amount adjusting means (34) for adjusting the water supply amount. 3. The centrifugal crushing and sizing machine according to claim 1, wherein the water supply port (33) is positioned inside the top of the crushed particle upper layer (M). 4. In one claim selected from claim 1, claim 2 and claim 3, it flows out from the water supply port (33) and permeates into the crushed grain upper layer (M) and into the lower layer portion. A water absorption pipe (48) having a water absorption port (47) for collecting and absorbing the flowing water, and a reflux for circulating water between the water supply pipe (33) and the water absorption pipe (48). A centrifugal crushing and sizing machine characterized by comprising means (42, 43). 5. The crushed particles discharged from the rotor (11) are crushed by hitting the peripheral wall (21) surrounding the rotor (11), and the crushed particles crushed by the crushing are provided in the lower part of the peripheral wall (21). A crushed grain upper layer (M) having a slope (S) is formed by stacking on the floor surface of the floor (22) by gravity action, and the rotor (11) is provided on the slope (S) of the crushed grain upper layer (M). The crushed particle product is crushed by hitting the crushed particles discharged from the crushed particle product at a water content of a proportion that does not form a water flow layer in the water flow flowing down on the slope (S) of the upper layer (M). A centrifugal crushing and sizing method in which water is contained in the upper layer (M).