JPH084757B2 - Sand screening sorter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand sieving and sorting machine, and more particularly to a sand sieving and sorting machine for surely preventing clogging and efficiently sieving sand of a required particle size.

[0002]

BACKGROUND OF THE INVENTION As is well known, aggregates for concrete are diversified, and they can be roughly classified into natural sand such as mountain gravel, sea gravel and land gravel, and quarry. It is classified into crushed sand obtained by subjecting the crushed stone mined in.

In the past, it has been customary to sort the above-mentioned natural sand and crushed sand at the same time by using the same sorter, but in recent years, due to restrictions on specifications, etc. It has come to be necessary to sort them separately from crushed sand.

Further, regarding the sieving of crushed sand, it is necessary to sort the crushed sand having a small particle size.
The mesh of the sorter used in this case would have to be quite small.

As a concrete example of such a sorting machine,
According to Japanese Patent Laid-Open No. 57-70479 and Japanese Patent Laid-Open No. 59-199060, a net for sifting is stretched over the peripheral wall of a cylindrical drum, and the cylindrical drum is arranged in an inclined state. Discloses a configuration in which a cylindrical drum is driven to rotate.

[0006]

However, when crushing sand having a required particle size, particularly crushed sand having a small particle size, is to be sorted out by using a rotary drive type sorting machine, it is like the sorting machine disclosed in the above publication. There is a problem in that the mesh is clogged due to the small particle size of the crushed sand or the peculiarities of the crushed sand shape and surface roughness, etc., by simply rotating the cylindrical drum that is inclinedly arranged. .

Therefore, it is difficult to efficiently select crushed sand having a small particle size by simply rotating the cylindrical drum uniformly without any means as in the prior art, and the selection efficiency is extremely deteriorated. Is the reality.

The present invention has been made in view of the above circumstances, and improves the method of rotating a cylindrical drum so that crushed sand with a small particle size can be efficiently selected without causing clogging, Therefore, it is a technical subject to improve the sorting efficiency and shorten the sorting time.

[0009]

The sand sieving and sorting machine according to the present invention, which has been made in order to achieve the above technical objects, comprises:
It is characterized by being configured as shown below. That is, a feed port is formed on one end wall of the cylindrical drum, a discharge port is formed on the other end wall, and a net-like body having a predetermined mesh size is stretched over the opening formed on the peripheral wall. In the sand sieving sorter in which the cylindrical drum is rotatably supported in a state in which the discharge port side is inclined downward than the discharge side, rotation of the discharge port side
While aligning the center with the central axis of the cylindrical drum,
Place the center of rotation on the feed port side with respect to the center axis of the cylindrical drum.
Eccentric by a fixed size, and the cylindrical drum is driven to rotate.
The driven part that receives the rotational driving force from the driving part
It is provided on the discharge side of the drum .

[0010]

[0011]

According to the above-mentioned means, when crushed sand is introduced into the cylindrical drum from the feed port and a rotational driving force is applied thereto, the cylindrical drum is eccentrically rotated, so that the crushed sand in the inside is crushed. Tries to pass through the mesh of the peripheral wall with eccentric movement.

Since the eccentric movement is performed in this manner, centrifugal force having a non-uniform strength and weakness repeatedly acts on the crushed sand to try to pass through the reticulated body, so that it is periodically strong. The crushed sand will be pushed outward by the force, and the occurrence of clogging will be effectively suppressed as compared with the case of performing a normal rotary motion.

In addition, during such eccentric rotation, the rotation angle is not changed by eccentricizing the discharge port side, which is the lower side portion of the inclined cylindrical drum, but eccentric only the feed port side, which is the upper side portion. Depending on the position, there are times when the inclination is large and times when the inclination is small.Therefore, when the inclination is large, the crushed sand moves well from the feed port side to the discharge side, and the smooth movement of the crushed sand is not hindered. However, compared with the normal rotational movement in the tilted state, it is possible to suppress the force of pushing up the entire cylindrical drum toward the feed port side, that is, the weight of the entire cylindrical drum from acting downward. Therefore, the rotary bearing of the cylindrical drum can be satisfactorily performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sand screening sorter according to the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a sand screening sorter 1 in this embodiment.
In the cylindrical drum 2, one end wall 3 and the other end wall 4 are connected and fixed by a plurality of reinforcing rods 5 ... 5, and these reinforcing rods 5 ... 5
All openings formed between the two are completely covered with the mesh body 6.

On one end wall 3 of the cylindrical drum 2, a feed pipe 7 having a feed port 7a inside is fixed, and on the other end wall 4, a feed port 8a inside. The discharge pipe 8 is fixed. The supply pipe 7 and the discharge pipe 8 are a water tank 9 described later.
Are mounted above the feed port side support rollers 10 and 10 and the discharge port side support rollers 11 and 11 which are rotatably held on the upper surfaces of both side walls of the.

A concave surface 11x is formed on the outer circumference of the discharge port side support roller 11, and a convex ring body 8x is provided on the outer circumference of the discharge pipe 8 so as to project from the convex ring body 8x. The concave surface 11x of the discharge side support roller 11 is in an engaged state. Therefore, the discharge port side support roller 11 rotatably supports the discharge port side end of the cylindrical drum 2 and at the same time blocks the axial movement of the cylindrical drum 2.

Explaining in detail the structure of the drive section for rotating the cylindrical drum 2, as shown in FIG.
A driven sprocket 12 (driven portion) is fixedly mounted on the drive shaft, and the driving force of a drive motor 13 (driving portion) fixed to the end wall of the water tank 9 is directly transmitted to the lower sides of both sides thereof. A sprocket 14 and a driven sprocket 16 slidably supported on the end wall of the water tank 9 in the ef direction are arranged, and an endless chain 15 is wound around these sprockets 12, 14, 16. Has been.

As shown in FIG. 2, the central axis X of the cylindrical drum 2 is a predetermined angle α (for example, 3 degrees or more) with respect to the horizontal line L so that the discharge port 8a side is lower.
Is inclined only downward, and the rotation center X1 on the side of the feeding port 7a
Is eccentric with respect to the central axis X of the cylindrical drum 2 by a predetermined dimension β (for example, 20 mm or more with respect to a radius of 500 mm of the cylindrical drum 2). In this case, the rotation center Y1 on the side of the discharge port 8a coincides with the center axis line X of the cylindrical drum 2. The lower end of the cylindrical drum 2 is located below the water surface W of the water tank 9.

As shown in FIGS. 1, 2 and 5, in the vicinity of the other end wall 4 on the outer circumference of the discharge pipe 8, a plurality of (three in the illustrated example) bulging portions are arranged at equal angular intervals. 81 ... 81 are formed, and the outer periphery of these bulging portions 81 ... 81 has a mesh body 82 ... 82 whose mesh size is smaller than that of the mesh body 6 of the cylindrical drum 2.
Has been stretched over.

Further, as shown in FIGS. 2 and 3, on the inner surface side of the other end wall 4 of the cylindrical drum 2, a screw-like shape for sending out and guiding the crushed sand therein to the bulging portions 81 ... 81. Curved guide vanes 83 ... 83 are attached,
A large number of through holes 83a ... 83a are formed in these guide blades 83 ... 83. As shown in the partially enlarged view of FIG. 3, the through hole 83a has a taper shape in which the upper side (front side) widens, and the hole diameter Dmm thereof is, for example, 2.5 m of crushed sand.
If it is m or less, it is set to 2.5 mm or more.

FIG. 8 shows an overall schematic structure of a sand water separation device 20 in which the sand screening and sorting machine 1 according to the present invention is used. This device 20 is roughly classified into a water tank 9 for storing water and sand. And the sand sieving and sorting machine 1 described above, the lower part of which is immersed in the water in the water tank 9, and the first sprocket 21 and the water wheel 22 in which the respective rotating shafts 21a and 22a are supported on the side walls of the water tank 9. A second sprocket 24 arranged outside the upper part of the water tank 9 and driven to rotate by a motor 23, and a third sprocket 25 arranged on the left side of the second sprocket 24.
And an endless chain for driving which is wound around the first, second and third sprockets 21, 24 and 25 and is driven and driven in the b direction.
26 and a plurality of buckets 27 ... 27 connected to the chain 26
The adjustment of the tension of the chain 26 is performed by the adjusting device 25a that moves the third sprocket 25 up and down.

Each of the buckets 27 is shown in FIG.
Further, as shown in FIG. 7, the partition plates 28 are partitioned by a plurality of partition plates 28 ... 28, and a large number of through holes 30 ... 30 are formed in the back surface portion 29 and the bottom surface portion 31 thereof. These through-holes 30 ... 30 are arranged in a zigzag pattern and, as shown in the partially enlarged view of FIG. 6, have a taper shape in which the surface side expands, and the hole diameter Emm is a grain of crushed sand. If the diameter is less than or equal to the predetermined mm, it is set to be greater than or equal to the predetermined mm. In addition, vibration transmission pieces 32, 32 are fixedly provided on the back side of the bottom surface portion 31 of each of the buckets 27, and the lower wall of the cover member 35 on the right side of the water tank 9 is secured.
The vibration transmission pieces 32, 32 slidably contact the pedestals 38a, 38a on the upper surfaces of the rails 38, 38 fixed to the rail 36, and the back wall side of the lower wall 36 of the cover member 35 is , A vibration generator for applying vibration in the cd direction in FIG. 7 to the lower wall 36
40 is attached.

Further, as shown in FIG. 8, the cover member
A catch chute 41 for collecting the sand scattered and dropped from each bucket 27 is installed on the right side of 35, and a drain port 44 is formed on the left side wall of the water tank 9.

Next, the operation of the characteristic portion of the above embodiment will be described. When the sand water separator 20 shown in FIG. 8 is operating,
First, crushed sand and water generated by a crushed sand manufacturing apparatus (not shown) are put into the inside of the cylindrical drum 2 from the feed port 7a of the sorter 1 shown in FIGS. By performing the operation shown, sand sieving work is executed.

That is, in the cylindrical drum 2 of this sorter 1, the rotational force of the drive motor 13 is transmitted through the endless chain 15 to support the feed port side support rollers 10, 10 and the discharge port side support rollers. The rollers 11 and 11 are rotating in the direction of a in FIG. 1, and under such a state, crushed sand and water are continuously supplied to the inside through the feed port 7a of the cylindrical drum 2. To be done.

Among the crushed sands supplied, there are crushed sands with a particle size within a predetermined value (especially within a small predetermined value) and non-standard crushed sands with a particle size above a predetermined value. Although contained, the crushed sand within the specifications passes through the meshes of the net-like body 6 on the peripheral wall of the cylindrical drum 2 and is immersed in the bottom of the water tank 9.

In this case, when the particle size of the crushed sand that needs to be sorted out is small, it is necessary that the mesh of the mesh body 6 is also fine. In such a case, the mesh body is required. 6 is easily clogged, but the rotation center X1 of the cylindrical drum 2 on the side of the feeding port 7a is
Since it is eccentric by a predetermined dimension β from the central axis X of
The crushed sand inside it will try to pass through the mesh of the peripheral wall mesh with eccentric movement, and by this eccentric movement, centrifugal force with strength and weakness repeatedly acts on crushed sand. Will try to pass through the eyes of the mesh body 6. Therefore, even if the crushed sand causes clogging in the mesh body 6, the crushed sand is periodically pushed outward with a strong force, and compared with the case of performing a normal rotary motion, the clogging sand is clogged. The occurrence of is effectively suppressed.

Further, since the rotation center Y1 on the discharge port 8a side, which is the lower side portion of the cylindrical drum 2, is aligned with the central axis X of the cylindrical drum 2 without eccentricity, it is in a normal simple tilted state. In comparison with the rotational movement of the cylindrical drum 2, the force that pushes up the entire cylindrical drum 2 toward the feeding port 7a acts, that is, the cylindrical drum 2
Since it is possible to suppress the entire weight from acting downward, and the axial movement of the cylindrical drum 2 is less likely to occur, the discharge port 8 is supported by the discharge side support roller 11, and the concave surface of the support roller 11 is supported. The engagement between 11x and the convex ring member 8x of the discharge pipe 8 is maintained well, and the bearing action of the cylindrical drum 2 is surely and smoothly performed.

The non-standard crushed sand remaining inside the cylindrical drum 2 is discharged due to the inclined arrangement of the cylindrical drum 2.
First, the guide pipes 83 ... 83 move to the discharge pipe 8
In addition to being guided to the swelling parts 81 ... 81 in the inside and during this time, water is removed by the through holes 83a ... 83a of the guide vanes 83,
Moisture is surely discharged from the mesh-like body 82 of the bulging portion 81 by being temporarily accumulated in the bulging portion 81 and subjected to the action of centrifugal force due to the rotation, and then the water is discharged from the outlet 8a to the outside of the water tank 9. Is discharged to.

[0030]

Since the sand screening sorter according to the present invention is constructed as described above, it has the following effects. That is, according to the sand sieving and sorting machine of the present invention , since the cylindrical drum rotates eccentrically, the crushed sand inside the slab tends to pass through the mesh of the peripheral wall with eccentric movement. The crushed sand is periodically pushed out toward the outside of the reticulate body by a strong force, so that even if the crushed sand has a small particle size, the clogging is effectively suppressed.

[0031] Then, according to the sand sieved divided sorter, so as to eccentrically only feed port side is an upper side portion without decentering the outlet side is a lower side portion of the inclined tubular drum Therefore, the smooth movement of the crushed sand is not hindered, and the force that pushes up the entire cylindrical drum toward the feed port side acts as compared to the normal rotational movement without eccentricity, which causes the cylinder to move. The axial movement of the cylindrical drum is less likely to occur, and the rotary bearing of the cylindrical drum is favorably performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a sand screening sorter according to the present invention.

FIG. 2 is a vertical sectional front view showing an internal state of the sand screening sorter.

3 is a vertical cross-sectional side view taken along line AA of FIG.

FIG. 4 is a side view of the sand screening sorter.

FIG. 5 is a vertical sectional side view showing a main part of a discharge pipe of the sand screening sorter.

FIG. 6 is a perspective view showing a bucket which is a component of a sand water separation device in which the sand screening sorter is used.

FIG. 7 is a vertical sectional front view showing a peripheral structure of the bucket.

FIG. 8 is a schematic diagram showing an overall configuration of the sand water separator.

[Explanation of symbols]

1 Sand Screening Sorter 2 Cylindrical Drum 3 One End Wall 4 Other End Wall 6 Mesh 7 Feed Pipe 7a Feed Port 8 Discharge Pipe 8a Discharge Port 12 Driven Sprocket (Driven) 13 Drive Motor (Drive) α Inclination angle β Eccentric dimension X Center axis of cylindrical drum X1 Center of rotation on feed port side Y1 Center of rotation on discharge port side

Claims (1)

[Claims] 1. A cylindrical drum having a feed port formed at one end wall thereof and a discharge port formed at the other end wall thereof, and a mesh body having a predetermined mesh size stretched over an opening formed in the peripheral wall, In a sand sieving and sorting machine in which the cylindrical drum is rotatably supported in a state in which the discharge side is inclined downwardly from the supply side, the center of rotation of the discharge side is the central axis of the cylindrical drum. Conforms to
And the center of rotation on the side of the feed port is
It is eccentric to the central axis by a predetermined dimension and has the cylindrical shape.
Receives rotational drive force from the drive unit that rotationally drives the drum
A sand sieving and sorting machine, characterized in that a driven part is provided on the discharge side of the cylindrical drum .