JP2002011375A - Screen classifier for ready-mixed concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen classifier for ready-mixed concrete which is capable of performing a continuous process and thereby realizing the high processing efficiency, when aggregates of a larger size than specified are classified by screening the ready-mixed concrete. SOLUTION: This screen classifier for ready-mixed concrete is structured of a rotary drum 2 which is formed of a metal gauze 6 with a specified mesh size and is arranged in such a way that its shaft direction is horizontal and a motor 4 which rotates the rotary drum 2 around its center axis A. In addition, inside the rotary drum 2, a screw 11 for conveying the ready-mixed concrete loaded in the rotary drum 2 in the same direction as the center axis At is provided so that the screw 11 is rotatable around the center axis A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sieving apparatus for sifting aggregate of a predetermined size or more in ready-mixed concrete.

[0002]

2. Description of the Related Art As is well known, when spraying concrete, it is necessary to perform the mixing with a coarse aggregate having a predetermined size or less, and the concrete with this mixture is required. However, it is impossible to produce concrete of this composition in a general plant because the aggregate specification is not standard (if the plant is occupied and produced forcibly, it will be expensive).

[0003] In addition, it is also possible to prepare a plant for producing such concrete on site and perform the production.
Considering the physical quantity and management labor, it is extremely inefficient. Therefore, it is best to manufacture concrete using ordinary aggregates, remove large-diameter coarse aggregates in the concrete, and obtain concrete with the desired aggregate mixture, even when utilizing external plants. Method. In order to remove such large-diameter coarse aggregate, a method of putting fresh concrete into a horizontal vibrating sieve having a plane-shaped sieve and removing coarse aggregate can be considered.

[0004]

However, if such a sieve having a planar shape is used, a large-diameter coarse aggregate to be removed remains on the sieve.
The mesh of the sieve was clogged by these coarse aggregates, and the treatment efficiency was significantly reduced. Further, in order to remove the coarse aggregate remaining in this manner, it is necessary to perform cleaning every time the treatment is performed, which increases the labor and makes continuous treatment impossible.

The present invention has been made in view of such circumstances, and it is possible to perform continuous processing when sieving aggregate of a predetermined size or more in ready-mixed concrete. It is an object of the present invention to provide an apparatus capable of realizing high processing efficiency.

[0006]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The invention according to claim 1 is an apparatus for sifting aggregate having a predetermined size or more in ready-mixed concrete, wherein the device is formed by a mesh having the same mesh size as the predetermined size, and has an axial direction. A tubular body disposed so as to be in the horizontal direction, and a driving device for rotating the tubular body around a central axis thereof, inside the tubular body,
A screw for conveying the ready-mixed concrete charged into the cylindrical body in the axial direction is provided so as to be rotatable around the central axis.

[0007] With this configuration, when the ready-mixed concrete is transported inside the tubular body by the screw, the cement and the aggregate having a predetermined size or less can be dropped from the tubular body out of the ready-mixed concrete. At this time, by rotating the tubular body, the ready-mixed concrete does not concentrate on a part of the mesh body constituting the tubular body.

According to a second aspect of the present invention, there is provided the raw concrete sieving apparatus according to the first aspect, wherein the screw is integrally attached to an inner peripheral surface of the tubular body. .

[0009] With such a configuration, the ready-mixed concrete can be conveyed along the inner peripheral surface of the tubular body, and the screw is rotated integrally with the tubular body by the driving device. Can be.

[0010] The third aspect of the present invention is the first or second aspect.
The apparatus for sieving ready-mixed concrete according to the above, further comprising a vibrator for applying vibration to the tubular body.

[0011] With such a configuration, clogging of the mesh can be favorably prevented.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention. FIG. 1 is an elevation view of a sieving apparatus 1, FIG. 2 is a plan view, FIG. 3 is a left side view, and FIG. It is a right side view. As shown in these figures, the sieving device 1 includes a rotary drum (tubular body) 2 formed in a cylindrical shape,
It is roughly composed of a support frame 3 for supporting the rotating drum 2, a motor (drive device) 4 and an exciter 5 provided on the support frame 3.

The rotating drum 2 is formed by a wire mesh (net-like body) 6 having a mesh size of a predetermined size, and is arranged so that its axial direction is horizontal. The rotating drum 2 is rotatably supported around its central axis A by rollers 7, 7,... Attached to the support frame 3. The motor 4 of the support frame 3 is configured such that a roller 9 attached to a rotating shaft 8 thereof comes into contact with the outer peripheral surface of the rotating drum 2 to rotate the rotating drum 2. Further, the rotation speed of the motor 4 is variable.
The rotation speed of the rotary drum 2 can be made variable.

A screw 11 is provided inside the rotary drum 2. The screw 11 is integrally mounted on the inner peripheral surface of the rotating drum 2 with the rotating drum 2. When the fresh concrete is poured into the rotating drum 2 from the input port 12, the ready-mixed concrete is 2 and can be discharged from the discharge port 13.

The vibration exciter 5 attached to the support frame 3 applies vibration to a position of the support frame 3 on the side of the input port 12 of the rotary drum 2, thereby giving vibration to the rotary drum 2. You can do it. The vibrator 5 has a variable vibrating force, so that the intensity of vibration applied to the rotary drum 2 can be variable.

The supporting frame 3 is a charging port side frame 3a constituting a portion of the rotating drum 2 on the charging port 12 side.
However, the holding position of the rotating drum 2 can be adjusted up and down, thereby making it possible to adjust the level of the rotating drum 2, that is, the inclination of the center axis A.

Next, a method of using the sieving apparatus 1 will be described. For this, first, the entire sieving apparatus 1 is mounted, for example, above a receiving hopper of a concrete pump. Then, in this state, the motor 4 and the exciter 5 are operated. In this case, when the motor 4 is operated, the rotary drum 2 also rotates around its central axis A, whereby the screw 11 integrally attached to the rotary drum 2 is also rotated.

Next, ready-mixed concrete is charged into the charging port 12 of the rotating drum 2 rotated by the motor 4. The put ready-mixed concrete is guided by the rotating screw 11 and moves along the inner peripheral surface of the rotating drum 2.

In this case, since the rotary drum 2 is formed of a wire mesh 6 having a mesh size of a predetermined size, water and cement components and aggregates having a mesh size less than the mesh size pass through the mesh of the wire mesh 6 and move downward. Fall into
It will be put into the receiving hopper of the concrete pump. At this time, since the vibration is applied to the rotating drum 2 by the vibration exciter 5, clogging of the wire mesh 6 is prevented when water / cement components and aggregates having a mesh size or less pass through the wire mesh 6. It is.

On the other hand, the aggregate component having a mesh size or more
It moves along the inner peripheral surface of the rotary drum 2 without dropping from the rotary drum 2 and is discharged from the discharge port 13.
As a result, only the water / cement and the aggregate having a predetermined size or less can be dropped from the rotating drum, whereby the coarse aggregate having the predetermined size or more can be removed through the outlet 13.

In this case, the degree of difficulty in sieving varies depending on the slump, composition, etc. of the ready-mixed concrete, and the vibration applied by the vibration exciter 5 so that good sieving performance is always exhibited. Strength, motor 4
(The rotation speed of the rotary drum 2) or the level of the rotary drum 2 can be selected to be optimal.

In the above-described sieving apparatus 1, the rotary drum 2 is formed as a cylindrical body using a wire mesh 6 having a mesh size of a predetermined size.
The ready-mixed concrete placed in the rotary drum 2 is transported in the direction of the central axis A by the screw 11 because the horizontal direction is arranged in the axial direction. When water and cement are mixed from the ready-mixed concrete and aggregates having a predetermined size or less are transferred from the ready-mixed
It can be dropped from. In this case, the rotating drum 2
Is supposed to always rotate, so the rotating drum 2
The ready-mixed concrete does not concentrate on a part of
Clogging can be prevented. Further, since the aggregate having a predetermined size or more to be removed is transported from the inside of the rotary drum 2 to the outside by the screw 11, the aggregate is removed from the wire mesh 6.
And the wire mesh 6 can be better prevented from being clogged.

Therefore, by applying the sieving apparatus 1 to sieving of ready-mixed concrete manufactured in an external plant, ready-mixed concrete suitable for shotcrete containing no coarse aggregate having a predetermined size or more can be obtained.
It can be manufactured efficiently at low cost, and the construction cost can be reduced.

In the sieving apparatus 1,
Since the screw 11 is integrally attached to the inner peripheral surface of the rotary drum 2,
Can be conveyed along the wire mesh 6 on the inner peripheral surface of the above, and can be efficiently sieved. Further, since the screw 4 and the rotary drum 2 can be integrally rotated by the motor 4, the operation efficiency is excellent.

In the sieving apparatus 1,
When sieving ready-mixed concrete, the rotating drum 2
To be applied to the vibration by the vibration exciter 5,
It is possible to prevent clogging of the wire mesh more favorably,
Continuous sieving of ready-mixed concrete becomes possible.

Further, in the above-described sieving apparatus 1, the vibrating force of the vibrator 5, the rotation speed of the rotary drum 2, and the level of the rotary drum 2 are made variable, so that they can be used as slumps of ready-mixed concrete. By selecting an appropriate one according to the composition and the like, it is possible to always obtain good sieving performance.

[0027]

As described above, according to the first aspect of the present invention, a tubular body is formed by using a mesh body having a predetermined mesh size, and the tubular body is placed in a horizontal direction. It is arranged to be in the axial direction, and furthermore, because the ready-mixed concrete put into this cylindrical body is transported in the axial direction by the screw, when the ready-mixed concrete is transported inside the tubular body by the screw, In addition, water and cement and aggregate having a predetermined size or less can be dropped from the tubular body from the ready-mixed concrete. In particular, at this time, since the tubular body is always rotating, fresh concrete does not concentrate on a part of the tubular body, and thus clogging of the mesh body can be prevented. In addition, since aggregate having a predetermined size or more to be removed is transported from the cylindrical body to the outside by the screw, clogging of the mesh body can be prevented more favorably. This makes it possible to continuously process the sieving of ready-mixed concrete with high efficiency.

According to the second aspect of the present invention, since the screw is integrally attached to the inner peripheral surface of the cylindrical body, the ready-mixed concrete is transported along the mesh on the inner peripheral surface of the cylindrical body. Sifting can be performed efficiently. Further, since the screw and the cylindrical body can be integrally rotated by the driving device, the operation efficiency is excellent.

According to the third aspect of the present invention, when the fresh concrete is sieved, vibration is applied to the tubular body by the vibrator, so that the clogging of the mesh body can be more effectively prevented. Sintering of the ready-mixed concrete can be satisfactorily performed.

[Brief description of the drawings]

FIG. 1 is an elevational view of a sieving apparatus schematically showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a left side view of the same.

FIG. 4 is a right side view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sieving device 2 rotating drum (tubular body) 3 support frame 4 motor (drive device) 5 exciter 6 wire mesh (net-like body) 11 screw A central axis

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masamichi Nagata 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hitoshi Kanakubo 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Osamu Kusaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Co., Ltd. F-term (reference) 4D071 AA06 AB05 AB43 DA20 4G056 AA06 CD36

Claims (3)

[Claims] 1. A device for sieving aggregate of a predetermined size or more in ready-mixed concrete, wherein the device is formed of a mesh having the same mesh size as the predetermined size, and its axial direction is horizontal. And a driving device for rotating the cylindrical body around its center axis. The ready-mixed concrete charged into the cylindrical body is provided inside the cylindrical body. A screw for transporting in the axial direction,
A sieving apparatus for ready-mixed concrete, which is provided rotatably around the central axis. 2. The ready-mixed concrete sieving apparatus according to claim 1, wherein the screw is integrally attached to an inner peripheral surface of the tubular body. 3. The ready-mixed concrete sieving apparatus according to claim 1, further comprising a vibrator for applying vibration to the tubular body. .