JP3306435B2 - Aggregate collection classifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating aggregates consisting of sand and gravel in drainage of ready-mixed concrete by a diameter difference using a separation drum, and sedimenting and separating the separated sand by a difference in specific gravity to remove cement and the like. The present invention relates to improvement of a wet-type aggregate collecting classifier that separates and removes sludge, and more particularly, to prevent solidification of accumulated wastewater after completion of the classification by the aggregate collecting classifier and to restart the operation. The present invention relates to an improvement of the classifier for collecting aggregates so as not to cause trouble.

[0002]

2. Description of the Related Art In a ready-mixed plant, ready-mixed concrete is loaded into a tank of a mixer truck and transported to a work site. When a day's work is completed, the ready-mixed concrete remaining in the tank of the mixer truck is washed and drained. This ensures that the next day's work is not hindered. The wastewater that cleans the interior of the tank contains cement and other sludge,
If this is directly discharged into rivers, river pollution will occur. Therefore, it is necessary to discharge the wastewater to the river through some kind of wastewater treatment equipment.However, since there is no simple and small-sized wastewater treatment equipment, the washing wastewater from the tanks of the mixer trucks was conventionally discarded as it was. It was actual.

In recent years, however, it has become necessary to prevent environmental pollution and to recover resources, and it is no longer possible to discard the wastewater from washing the tank of a mixer truck as it is, and the need to recover residual aggregate is also increasing.

[0004] When collecting gravel and sand aggregate from washing wastewater of a tank of a mixer truck in a ready-mixed plant,
First, the washing wastewater is supplied to a classifier for washing to separate the gravel and sand from the sludge, and then the mixture of the gravel and sand is separated into gravel and sand by another mesh classifier and collected. It is possible. However, in the case of using a plurality of classifiers as in the above technique, there is a disadvantage that the installation area of the machine becomes large.

On the other hand, an apparatus for recovering aggregate from ready-mixed concrete wastewater as described below is also known. That is, a rotatable rotatable cylindrical separation drum having an equal diameter, a raw material supply port opened to the separation drum and supplied with raw concrete drainage, and supplied into the separation drum from the raw material supply port. The inner feed blade provided in the separation drum so as to transfer the raw material to the other end side of the separation drum, and the solid material such as gravel and sand in the raw material sent by the inner feed blade is separated by a diameter difference. A large number of separation holes formed in a peripheral plate of the separation drum so as to leave the large-diameter material in the separation drum, and one end face side of the separation drum so as to lift the large-diameter material transferred by the inner feed blade. , A conical chute formed on the other end surface of the separation drum for discharging a large-diameter object lifted by the lifting body out of the separation drum, and a large chute discharged from the conical chute. Exhaust that guides diameter objects to the outside A chute, a sedimentation tank which is disposed below the separation drum, and has a partially circular inner surface with the same diameter for sedimentation and separation of a small-diameter material that has escaped from the separation drum; and a sedimentation comprising a small-diameter material settled in the sedimentation tank. A one-way or two-way outer feed blade provided so as to be rotatable integrally with the separation drum outside the peripheral surface plate of the separation drum so as to scrape an object toward a later-described scooping discharge unit, and the outer feed blade A bucket-shaped scooping and discharging section integrally rotatably provided at a predetermined position on the outer periphery of the separation drum so as to scoop up and discharge the sediment collected by the An aggregate recovery classifier comprising: a discharge chute provided on a side surface of the sedimentation tank for receiving sediment dropped from the part; and a discharge port for discharging drainage overflowing from the sedimentation tank. (Tokuhei 5
No. 4144)

[0006] This known classifier for collecting aggregates has a small occupied area, is compact, and has good separation of cement from the collected aggregates. It is highly regarded in the industry.

[0007]

The above-mentioned classifier for collecting aggregates has been developed and patented by the present applicant, but has the following problems. That is, after the classification work of the aggregate collection is completed, if the wastewater is left in the sedimentation tank of the classifier until the next day with the wastewater left, the cement in the wastewater solidifies in the sedimentation tank, The separation hole is partially closed, or adheres and solidifies on the surface of each part such as the feed blade and accumulates. If such blockage or accumulation is repeated, the machine itself may become inoperable.

Conventionally, in order to prevent solidification of cement in wastewater, a classifier for collecting aggregates was intermittently rotated by a timer to prevent solidification of cement in a sedimentation tank.
Since the classifier was rotating at night, there was a problem of noise to the neighborhood.

Accordingly, an object of the present invention is to improve the drawbacks of the conventionally known classifier for collecting aggregates, to prevent solidification of wastewater accumulated in the sedimentation tank after the classification is completed, and to restart the operation. Another object of the present invention is to provide a classifier for collecting aggregates which does not cause troubles.

[0010]

The present invention comprises the following elements. A cylindrical separation drum of equal diameter provided rotatably. A raw material supply port opened to the separation drum and supplied with ready-mixed concrete drainage. An inner feed blade provided in the separation drum so as to transfer the raw material supplied from the raw material supply port into the separation drum to the other end of the separation drum. A plurality of separation holes formed in a peripheral plate of the separation drum so that solids such as gravel and sand in the raw material sent by the inner feed blades are separated by a diameter difference and large-diameter materials are left in the separation drum. A lifting body radially provided on one end surface side of the separation drum so as to lift the large-diameter object transferred by the inner feed blade.
A conical chute formed on the other end face of the separation drum for discharging the large-diameter object lifted by the lifting body to the outside of the separation drum. A discharge chute for guiding the large-diameter object discharged from the conical chute to the outside. A sedimentation tank which is disposed below the separation drum and has a partially circular inner surface having the same diameter for sedimentation and separation of small-diameter materials that have escaped from the separation drum. A one-way or two-sided rotatable unit provided integrally with the separation drum outside the peripheral plate of the separation drum so that the sediment consisting of the small-diameter object settled in the settling tank is swept toward a scooping discharge unit described later. Outer feed vane in direction. A bucket-shaped scooping and discharging unit provided so as to be integrally rotatable at a predetermined position on the outer periphery of the separation drum so as to scoop up the sediment scraped by the outer feed blades and discharge the sediment out of the sedimentation tank; A discharge chute provided on a side surface of the settling tank for receiving the sediment dropped from the scooping discharge section. An outlet through which drainage overflowing from the settling tank flows out. An apparatus for supplying clean washing water into the settling tank and diluting the cement content in the wastewater stored in the settling tank after the classification is completed.

[0011]

According to the present invention, the wastewater in the sedimentation tank is diluted with the washing water, so that the cement content in the wastewater is reduced and solidification based on the cement content is eliminated, and the respective parts of the classifier are always kept in a clean state. Operation will not be hindered.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. In the present embodiment, as a raw material, waste water after washing a tank of a plant or a mixer truck in a ready-mixed concrete plant is used as a raw material, gravel is separated by a diameter difference using a separation drum, and the remainder is separated and settled into sand and sludge. Although described, the application of the present invention is not limited to this, and the present invention can be generally applied to a case where a solid material in a raw material is separated by a diameter difference and the remaining material is separated by a specific gravity.

First, the entire system of the classifier for collecting aggregates of the present invention will be described with reference to FIG. Thickener 5
The wastewater that has washed the tank of the tank truck 50 with the washing water supplied from the water tank 59 from which the cement content has been removed from the tank 5 is sent to the discharge chute 51,
Is introduced into the classifier 52 for collecting aggregates. In the classifier 52 for collecting aggregates, sand 53 having a small diameter and gravel 54 having a relatively large diameter are collected. The details of the classifier 52 as the recovery mechanism will be described later with reference to FIGS.

The wastewater containing the cement slurry and the like from the classifier 52 for collecting aggregates is introduced into the thickener 55 to settle the cement slurry by natural settling. The sedimented cement slurry is sent to a dehydrator 57 by a slurry pump 56. In the dewatering machine 57, water is dewatered from the cement slurry.
8 is taken out and the separated water is collected in a water tank 59 at the same time.

The water in the water tank 59 is used, on the one hand, as water for washing the tank of the tank truck 50 via a pipe 60, and on the other hand, the aggregate, which is a characteristic structure of the present invention, is provided via a pipe 61. It is used as washing dilution water for the sedimentation tank 5 (see FIGS. 2 and 3) of the classifier 52 for collection. The water in the water tank 59 is circulated to the pipe 60 and the pipe 61 by a submersible pump installed in the water tank 59.
The selection of the pipe 60 or the pipe 61 may be made by a valve (not shown) or by another switching device.

Next, details of the classifier for collecting aggregates to which the present invention is applied will be described with reference to FIGS.
An outer feed blade 4 having a spiral blade shape or the like is provided on a peripheral plate 2 of the separation drum 1 via an arm 3 so as to be rotatable integrally with the separation drum 1 and disposed in a settling tank 5. The small-diameter material and sludge are supported by the frame 6, and fall through the separation holes 24 formed in the separation drum 1 into the sedimentation tank 5 to leave gravel in the separation drum 1. Is to put the sand and sludge falling out of the separation drum 1 and settle and separate them, and the outer feed blade 4 is used to discharge the sand settled in the settling tank 5 to a scooping discharge unit 2 to be described later.
6 to the scooping position.

Here, the shape and structure of the settling tank are not limited to those shown. In addition, the transfer direction of the outer feed blade 4 is determined by the position of the scooping discharge unit 26,
For example, in the case where the scooping discharge unit 26 is provided on the side of the end surface 7 of the separation drum 1 opposite to that of this embodiment, the transfer direction is, of course, opposite to that of this embodiment.
On one end face 7 of the separation drum 1, the raw material is placed on the separation drum 1.
A raw material supply port 8 for supplying the raw material into the inside is formed, and in this embodiment, a cylindrical portion 9 for rotatably supporting one end side of the separation drum by a support roller 16 described later protrudes from the raw material supply port 8. ing. A discharge port 11 for discharging gravel from the separation drum 1 is provided on the other end face 10 of the separation drum 1.
In the present embodiment, a conical chute 12 is disposed in the separation drum 1 facing the discharge port 11, and a trumpet-type discharge chute 13 is provided with an end face 7 facing outward from the discharge port 11.
The base end of the trumpet-shaped discharge chute 13 is
A cylindrical portion 14 having an equal diameter for rotatably supporting the separation drum 1 by a support roller 15 described later.

In this embodiment, a chute for discharging gravel is constituted by the conical chute 12 and the trumpet-shaped discharge chute. However, the structure of the chute for discharging large-diameter objects is not limited to the illustrated one. Instead, for example, the conical chute can be replaced with a frusto-conical chute, a hole truncated chute, a polygonal chute, a hollow polygonal chute, or the like. Also,
The conical chute may be omitted and the shape of the lifting body may be changed so that the sediment can be discharged out of the discharge port, which is also included in the present invention. By omitting the conical chute in this way or by forming a chute with holes formed,
A raw material supply pipe can be inserted into the discharge port, and in this case, the discharge port doubles as the raw material supply port.

As described above, since the separation drum 1 is rotatably arranged in the settling tank 5, in this embodiment, two support rollers 15 are provided at the front of the frame 6 and two support rollers 16 are provided at the rear. The cylindrical portion 9 on one end surface side of the separation drum 1 is rotatably supported by a support roller 16, and the cylindrical portion 14 of the trumpet type discharge chute 13 is rotatably supported by a support roller 15. However, the support means for the separation drum 1 is not limited to the support roller, and any rotatable support means such as a bearing, for example, can be employed.

In the present embodiment, as a rotation drive mechanism of the separation drum 1, a winding body such as an endless chain 18 is wound around a chain tooth 17 formed on the outer periphery of the cylindrical portion 14 of the trumpet type discharge chute 13, Through this endless chain 18, the trumpet type discharge chute 13 and a drive source such as a motor 19 with a speed reducer are linked.

Here, the rotary drive mechanism of the separation drum 1 is not limited to this embodiment. For example, the portion receiving the driving force from the driving means is a trumpet-type discharge chute 13.
The driving force may be transmitted to, for example, the cylindrical portion 9 on the other end surface or the peripheral plate 2 of the separation drum 1. Also, the driving force transmitting means is not limited to the winding body, and may be any means such as a gear.

The inner wall 20 of the separation drum 1 of this embodiment has
A spiral blade 21 for preventing overflow, a stirring body 22, an inner feeding blade 23, and a lifting body 25 are provided from the raw material supply port 8 side to the discharge port 11 side, and the place where the stirring body 22 is installed becomes the stirring unit A. The location where the inner feed blades 23 are located is a separation portion B.

The structure inside the separation drum 1 will be described in detail. First, overflow prevention blades 21 such as spiral blades having a transfer direction toward the inside of the separation drum 1 are provided on the raw material supply port 8 side. A plurality of stirrers 22 are provided radially protruding substantially perpendicularly from the inner wall 20 in the downstream of the prevention blades 21 to stir the raw material to break up mud clumps in the raw material and to remove gravel or sand. It promotes the peeling of the cement component adhering to the surface. The discharge port 11 is provided downstream of the stirring body 22.
A spiral inner feed blade 23 having a transfer direction in the direction is provided. Also, the separation portion B of the peripheral plate 2 of the separation drum 1
Are provided with a large number of separation holes 24 having an arbitrary shape such as a mesh and a punched hole having a diameter that allows sand and sludge to pass therethrough but does not pass through the gravel. It falls off into the tank 5 and is separated from the gravel remaining in the separation drum 1. Further, the discharge port 11
On the side, a plurality of lifting bodies 25 are provided radially around the conical chute 12 to lift the gravel transferred by the inner feed blades 23 and
It is designed to slide down towards.

A scooping and discharging section 26 for scooping up the sand gathered by the outer feed blades 4 and discharging the sand out of the settling tank 5
Is provided at an appropriate position on the outer periphery of the separation drum 1 so as to be integrally rotatable with the separation drum 1. As shown in FIG. 2, the scooping and discharging unit 26 according to the present embodiment has a bucket shape, and a scooping unit 27 for scooping sand and the scooping unit 27.
And an inner holding portion 28 that cooperates with a scooping portion 27 and holds the sand in cooperation with the scooping portion 27. The scooping portion 27 removes the sand discharged from the scooping and discharging portion 26 immediately after the scooping portion 26 outside the sedimentation tank 5. The drainage hole 29 is formed in the inner holding portion 28 to return the water contained in the sand in the scooping discharge portion 26 to the settling tank 5. Thereby, the moisture content of the recovered sand is reduced. A sand discharge chute 30 for sliding down and discharging the sand discharged from the scooping discharge section 26 is provided on a side surface of the settling tank 5.

On the other hand, a sludge discharge path such as a gutter 31 or a pipe for receiving drainage containing sludge overflowing from the settling tank 5 is provided at an arbitrary position in the settling tank 5, and a sludge discharge pipe (shown in the drawing) is provided at an opening 32 of the gutter 31. (Omitted) is connected. Note that the gutter 31 may be omitted and only a discharge port for sludge or the like may be provided at an arbitrary position in the settling tank 5, which also belongs to the present invention.

The present embodiment constructed as described above operates as follows. The driving force of the motor 19 with a speed reducer is transmitted to the cylindrical portion 14 of the trumpet type discharge chute 13 via the endless chain 18, and the separation drum 1 is rotated on the support rollers 15 and 16. A raw material supply pipe 33 is inserted into the raw material supply port 8 of the separation drum 1, and after a raw material plant or a mixer truck as a raw material is washed into the separation drum 1 via the raw material supply pipe 33. Supply wastewater. In the rotating separation drum 1, the raw material is first lifted by the stirrer 22, dropped, and destroys the mud mass in the raw material, and is separated into a large diameter and a small diameter, and at the same time, the separation of the sludge is promoted. . At this time, the overflow preventing blades 21 return the raw material into the separation drum 1 so that the raw material does not come out of the separation drum 1. The raw material thus stirred is transferred by the inner feed blade 23 toward the discharge port 11, and during the transfer, the separation holes 24 of the separation drum 1 are separated.
Sand and sludge fall off and pass or fall into the sedimentation tank 5, leaving the gravel in the separation drum 1 to be separated. Then, the gravel is lifted by the lifting body 25 to slide down on the conical chute 12, and then slide down from the discharge port 11 onto the trumpet type chute 13 to be discharged.

On the other hand, the sand and sludge dropped or passed into the sedimentation tank 5 are settled and separated by a specific gravity difference, and the settled sand is scraped by the outer feed blade 4 to the scooping position of the scooping discharge part 26, where it is scraped. The scooping unit 27 of the scooping and discharging unit 26 scoops up sand, and while the scooping and discharging unit 26 rotates, water falls out of the drain hole 29 into the sedimentation tank 5 and the scooping and discharging unit 2
The low-moisture content sand discharged from 6 is discharged by sliding down the discharge chute 30. On the other hand, the sludge separated from the sand in the settling tank 5 overflows from the settling tank 5 and flows into the gutter 31,
The gas is discharged from the gutter 31 through a discharge port 32 through a discharge pipe (not shown).

The operation described above is the same as that of a conventionally known classifier for collecting aggregates, but the characteristic operation of the present invention is as follows. When the washing of all the tank trucks 50 is completed by the washing water supplied from the water tank 59 from which the cement is removed, and the aggregate collecting operation is completed, the operation of the aggregate collecting classifier 52 is stopped. In this state, the cement contained in the wastewater stored in the sedimentation tank 5 of the classifier 52 solidifies, and various problems occur. For this reason, in the present invention, after the classification is completed by the aggregate collecting classifier, the water stored in the water tank 59 is supplied again into the sedimentation tank 5 via the pipe 61 as washing water. The amount of cement accumulated in the sedimentation tank 5 is stirred with the washing water by the rotation of the outer feed blade, and washing dilution water containing cement particles is again introduced into the thickener 55 from the outlet. In the thickener 55, the cement slurry is settled, and the sedimented cement slurry is sent to a dehydrator 57 by a slurry pump 56, which dehydrates the water from the cement slurry and stores the water in a water tank 59. Will be. As described above, the amount of cement contained in the wastewater in the sedimentation tank 5 is reduced, and the problem due to the solidification of the cement does not occur.

It should be noted that the present invention is not limited to the above-described embodiments. For example, the outer feed blade 4 and the inner feed blade 2
Numeral 3 is not limited to a continuous spiral blade, and blades composed of a plurality of pieces may be arranged substantially spirally at intervals, and cover the separation drum and the outer feed blade on the settling tank. May be provided, and these also belong to the present invention.

[0030]

The effects of the present invention configured and operated as described above are as follows. ADVANTAGE OF THE INVENTION According to this invention, the amount of cement in the wastewater accumulated in the sedimentation tank is reduced, and the problem due to the solidification of the cement is eliminated. The conventional intermittent rotation by the timer generates noise at night and disturbs the neighborhood, but in the present invention, no noise is generated since there is no rotation at night.

According to the present invention, while the inner feed blade transfers the raw material toward the discharge hole, the small-diameter material and the sludge fall out of the separation hole of the separation drum into the settling tank, and the large-diameter material remaining in the separation drum is removed. The lifting body lifts and discharges from the discharge port.On the other hand, the small blades settled in the sedimentation tank are raked up by the external feed blade to the position of the scooping discharge section, and discharged by the scooping discharge section. The material can be classified into large-diameter, small-diameter, and sludge, reducing the area occupied by the machine, simplifying maintenance, and reducing manufacturing costs.

Since the separation drum is a cylindrical body having the same diameter, the volume of the sedimentation tank can be increased as compared with the conical settling tank, and the installation area is reduced accordingly. or,
If the same occupied area is used, the volume of the sedimentation tank increases by that much, so that the residence time of the raw material is prolonged, the sludge separation is improved, and the quality of the recovered aggregate is improved.

Since the bucket-shaped scooping unit can be installed at an arbitrary position on the outer periphery of the separation drum, the take-out position of the large-diameter object to be recovered can be set arbitrarily, and the degree of freedom of the installation layout of the apparatus is increased. The installation layout does not hinder the sediment removal position. In addition, since the agitator is provided, the destruction of the sludge is promoted, and the separation of the sludge is also promoted. Further, when the scooping discharge section is provided substantially at the center of the separation drum and the transfer direction of the outer feed blade is formed from both sides of the scooping discharge section toward the scooping discharge section, The load applied to the separation drum is not biased and is superior in durability, as compared with the case where the scooping discharge portion is located near one end on both sides of the blade.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the classifier for collecting aggregates to which the present invention is applied.

FIG. 3 is a vertical sectional view taken along a line AA in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation drum 4 Outer feed blade 5 Sedimentation 8 Raw material supply port 11 Discharge hole 12 Trump type chute 13 Conical chute 22 Stirrer 23 Inner feed blade 24 Separation hole 25 Lifting body 26 Scooping discharge part 50 Tank truck 51 Chute 52 Classifier for collecting aggregates 53 Sand 54 Gravel 55 Thickener 56 Pump 57 Dehydrator 58 Cement cake 59 Water tank 60 Piping 61 Piping

Claims (1)

(57) [Claims] 1. A raw material supply port, which is open to a rotatable rotatable equal-diameter cylindrical separation drum and is supplied with ready-mixed concrete wastewater that has been washed with washing water supplied from a water tank. An inner feed blade provided in the separation drum so as to transfer the ready-mixed wastewater supplied into the separation drum to the other end of the separation drum, and gravel in the ready-mixed wastewater sent by the inner feed blade; A large number of separation holes formed in the peripheral surface plate of the separation drum so that solids such as sand are separated by a diameter difference to leave a large diameter material in the separation drum, and a large diameter material transferred by the inner feed blade. A discharge mechanism formed on the other end surface of the separation drum for discharging outside the separation drum, and a sedimentation tank disposed below the separation drum and having a circular inner surface for sedimentation and separation of small-diameter materials that have escaped from the separation drum, From the small diameter material that settled in the settling tank One- or two-way outer feed blades provided so as to be rotatable integrally with the separation drum outside the peripheral surface plate of the separation drum so as to scrape the sediment toward a later-described scooping and discharging portion, and A bucket-shaped scooping and discharging portion integrally rotatably provided at a predetermined position on the outer periphery of the separation drum so as to scoop up the sediment scraped by the feed blade and discharge the sediment out of the sedimentation tank; An aggregate recovery classifier comprising a discharge port for draining drainage overflowing from the tank and leading to a thickener; wherein, after the classification in the aggregate recovery classifier is completed, the cement in the drainage guided to the thickener. Water is supplied to the settling tank as washing water, and the cement remaining in the settling tank is agitated with the washing water by rotation of the outer feed blade to remove cement particles. Including A classifier for collecting aggregates, characterized in that it is a washing water supply / drain circulation type device for introducing washing dilution water again into the thickener from the outlet.