JPH054144B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention uses a separating drum to separate aggregate consisting of sand and gravel in ready-mixed concrete wastewater based on diameter differences, and allows the separated sand to settle due to specific gravity differences. This invention relates to a wet type aggregate recovery classifier that separates and takes out sludge such as cement.

(Conventional technology) In a ready-mixed concrete plant, ready-mixed concrete is loaded into the tank of a mixer truck and transported to the work site.When the day's work is finished, the ready-mixed concrete remaining inside the tank of the mixer truck is washed and drained. I make sure that this does not interfere with the next day's work.

In the past, the cleaning wastewater from mixer truck tanks was simply thrown away.

However, in recent years, as environmental pollution prevention and resource recovery have become necessary, it is no longer possible to simply dispose of mixer truck tank cleaning wastewater, and there is an increasing need to recover residual aggregate.

When recovering gravel and sand aggregates from the wastewater from washing the tank of a mixer truck in a ready-mixed concrete plant, the washing wastewater is first fed to a washing classifier to separate the gravel and sand from the sludge. It is conceivable that the mixture of gravel and sand could be separated into gravel and sand by passing it through a separate mesh classifier and then recovering the mixture.

However, the technique described above, which uses a plurality of classifiers, has the disadvantage that the installation area of the machine becomes large.

On the other hand, feeding blades are installed on the inner periphery of one side and the outer periphery of the other side of a separation drum, which has a hollow conical shape on both sides, and this separation drum is placed in a settling tank to separate gravel and sand in the ready-mixed concrete wastewater. Classifiers designed for collection are also known. (Refer to Japanese Unexamined Patent Publication No. 53-41822.) (Problems to be Solved by the Invention) However, in the above-mentioned known separation drum type classifier, the method for taking out gravel and sand is based on the settling tank and the conical separation drum. Since the slope is sent or scraped from the bottom to the top using a feed blade, the gravel and sand removal locations are limited to both ends of the separation drum, which may interfere with the layout of the installation site. will occur.

In addition, since the shape of the settling tank is conical to match the shape of the separation drum, the volume of the settling tank is smaller than the installation area, and the time that wastewater stays in the settling tank is shortened. There is a risk that the collection of fine sand will be insufficient, and in order to recover sufficient fine sand, a sedimentation tank that occupies a large area must be used. This leads to an increase in the installation area. On the other hand, if the area occupied by the settling tank is reduced, the volume of the settling tank will be reduced by that amount, and the residence time for wastewater to remain in the settling tank will be shortened, resulting in insufficient collection of fine sand in the wastewater. As a result, the removal of sludge such as cement and other substances adhering to gravel and sand becomes insufficient, resulting in a decline in the quality of recovered aggregates.

The purpose of the present invention is to improve the drawbacks of the conventionally known classifiers for collecting aggregates, and to make it possible to classify gravel, sand, and sludge from ready-mixed concrete wastewater with a single compact machine, and at the same time, it has a large sedimentation volume. ,
Another object of the present invention is to provide a classifier for collecting aggregates in which the position for taking out small-diameter sediment can be arbitrarily selected.

(Means for Solving the Problems) The present invention is characterized by the following configuration.

A cylindrical separation drum with an equal diameter that is rotatably provided, a raw material supply port that is opened in the separation drum and to which ready-mixed concrete wastewater is supplied, and the raw material supplied into the separation drum from the raw material supply port is separated. An inner feeder blade provided in the separation drum so as to transfer the material to the other end of the drum, an agitator partially provided inside the raw material supply port side of the separation drum, and a feeder provided by the inner feeder blade. A large number of separation holes are formed in the peripheral plate of the separation drum, and the internal feeding blades are used to separate solid substances such as gravel and sand in the raw material to be separated by the difference in diameter and leave large-diameter objects in the separation drum. A lifting body is provided radially on one end surface of the separation drum to lift the transferred large-diameter object, and a separation drum and other parts are provided to discharge the large-diameter object lifted by the lifting body out of the separation drum. A conical chute formed on the end face, a discharge chute that guides large-diameter objects discharged from the conical chute to the outside, and an inner surface that is arranged below the separation drum and sediments and separates small-diameter objects that have come out of the separation drum. a partially circular sedimentation tank with equal diameters; A one-way or two-way outward feeding blade is provided to be rotatable integrally with the separating drum, and the separating drum is configured to scoop up the sediment scraped up by the external feeding blade and discharge it to the outside of the sedimentation tank. a bucket-shaped scooping and discharging section provided integrally and rotatably at a predetermined position on the outer periphery; a discharge chute provided on the side surface of the sedimentation tank for receiving sediment dropped from the scooping and discharging section; A classifier for collecting aggregates, consisting of an outlet that drains wastewater overflowing from a settling tank.

(Example) An example of the present invention will be described below in Figures 1 and 2.
This will be explained with reference to the figures.

In this example, wastewater after cleaning the plant and mixer truck tanks in a ready-mixed concrete plant is used as raw material, and a separation drum is used to separate gravel by diameter difference, and the remainder is separated into sand and sludge such as cement. However, the application of the present invention is not limited to this, and the solid matter in the waste water related to ready-mixed concrete is separated into large diameter matter, small diameter matter, and sludge based on the diameter difference, and the solid matter is separated from the remaining small diameter matter. This method can be generally applied to cases where the sludge is separated from the sludge based on specific gravity and the sludge is discharged together with wastewater.

Now, an external feeder blade 4 such as a spiral blade is attached to the peripheral plate 2 of the cylindrical separation drum 1 with the same diameter via the arm 3.
It is provided to be rotatable integrally with the separation drum 1 and placed in a sedimentation tank 5, and the inside surface of the sedimentation tank 5 is semicircular with the same diameter, but it does not necessarily have to be semicylindrical. It should be a circular shape. or,
It may also be a completely circular one that also serves as a cover. The sedimentation tank 5 is supported by a frame 6, and sand and sludge fall into the sedimentation tank 5 through a number of separation holes 24 (described later) formed in the separation drum 1, leaving gravel in the separation drum 1. The sedimentation tank 5 is used to collect the sand and sludge that have fallen out of the separation drum 1 for sedimentation and separation, and the external feed blades 4 scrape up the sand that has settled in the sedimentation tank 5 to the scooping position of the scooping and discharging section 26 described later. It is something to send.

Here, the direction of transfer of the outward feeding blade 4 is determined by the position of the scooping and discharging section 26. For example, when the scooping and discharging section 26 is provided near the end surface 7 side of the separating drum 1 opposite to the present embodiment. In such a case, it goes without saying that the direction of transport will be opposite to that of this embodiment.

A raw material supply port 8 for supplying raw materials to the separation drum 1 is formed on one end surface 7 of the separation drum 1, and in this embodiment, one end side of the separation drum is connected from the raw material supply port 8 to a support roller (described later). 16, a cylindrical portion 9 for rotatably supporting is provided in a protruding manner. Also,
A discharge port 11 for discharging gravel from the separation drum 1 is formed on the other end surface 10 of the separation drum 1. In this embodiment, a conical chute 12 is provided inside the separation drum 1 facing the discharge port 11. is arranged, and a wrapper-shaped discharge chute 13 is provided on the end surface 7 facing outward from the discharge port 11, and the base of the wrapper-shaped discharge chute 13 rotatably supports the separating drum 1 by a support roller 15 described later. It is a cylindrical portion 14 of equal diameter.

In the present embodiment, a gravel discharge chute is formed from the conical chute 12 and the lapper-shaped discharge chute; however, the structure of the gravel discharge chute is not limited to that shown in the drawings; for example, The conical chute can be replaced with a truncated conical chute, a polygonal pyramidal chute, a truncated polygonal pyramidal chute, etc., and these are also included in the examples of the conical chute. By making the conical chute into a truncated shape in this manner, the raw material supply port can be placed on the discharge port side.

As mentioned above, in order to arrange the separation drum 1 in the sedimentation tank 5 so as to be freely rotatable, in this embodiment, there are two support rollers 15 at the front part of the frame 6, and two support rollers 16 at the rear part, which are rotatably provided. The cylindrical portion 9 on one end side of the separation drum 1 is connected to the support roller 16.
The cylindrical portion 14 of the wrapper-shaped discharge chute 13 is rotatably supported by support rollers 15. However, the means for supporting the separation drum 1 is not limited to a support roller, and any rotatably supporting means such as a bearing can be used.

In this embodiment, the rotational drive mechanism of the separation drum 1 is the cylindrical portion 14 of the wrapper-shaped discharge chute 13.
A winding body such as an endless chain 18 is wound around the chain teeth 17 formed on the outer periphery of the exhaust chute 13 and a driving source such as a motor 19 with a speed reducer is linked via the endless chain 18. There is.

Here, the rotational drive mechanism of the separation drum 1 is not limited to this embodiment, and for example, the portion receiving the driving force from the driving means is not limited to the trumpet-shaped discharge chute 13, for example, the cylinder on the other end surface. The driving force may be transmitted to the section 9 or the peripheral plate 2 of the separating drum 1. Furthermore, it goes without saying that the driving force transmission means is not limited to the winding body, but may be changed to any other means such as gears.

The inner wall 20 of the separation drum 1 of this embodiment is provided with a spiral blade 21 for overflow prevention, an agitation body 22, an internal feed blade 23, and a lifting body 25 from the raw material supply port 8 side to the discharge port 11 side. The part where the body 22 is installed is the stirring part A, and the part where the internal feeding blade 23 is located is the separating part B.

To explain the internal structure of the separation drum 1 in detail, first, an overflow prevention blade 21 such as a spiral blade having a transfer direction toward the inside of the separation drum 1 is provided on the raw material supply port 8 side. In the wake, a plurality of agitating bodies 22 are partially provided in a radial manner, protruding approximately perpendicularly to the inner wall 20, and agitate the raw material to destroy mud lumps in the raw material and prevent it from adhering to gravel or sand. It is designed to promote the peeling of the cement that is present. A spiral inner feed blade 23 having a transfer direction in the direction of the discharge port 11 is provided downstream of the agitator 22 . In addition, the peripheral plate 2 of the separation drum 1
Separation part B is provided with a large number of separation holes 24 of arbitrary shapes such as meshes or punch holes with a diameter that allows sand and sludge to pass through but does not allow gravel to pass through, and the sand and sludge are separated through these separation holes 24. The gravel falls into the sedimentation tank 5 and is separated from the gravel remaining in the separation drum 1. Furthermore, on the discharge port 11 side,
A plurality of lifting bodies 25 are provided radially surrounding the conical chute 12, and the inner feeding blades 23
The conveyed gravel is lifted up and slid down toward the conical chute 12.

A scooping and discharging section 26 that scoops up the sand raked by the external feed blade 4 and discharges it to the outside of the sedimentation tank 5.
are provided at appropriate positions on the outer periphery of the separation drum 1 so as to be rotatable together with the separation drum 1. As shown in FIG. 2, the scooping and discharging section 26 according to this embodiment has a bucket shape, and includes a scooping section 27 that scoops up sand, and a scooping section 27 provided inside the scooping section 27. The scooping part 27 has the function of a chute for sliding and discharging the sand released from the scooping and discharging part 26 immediately behind the scooping part 26 in the circumferential direction to the outside of the settling tank 5. In addition, a drainage hole 29 is formed in the inner holding part 28, and the water contained in the sand in the scooping and discharging part 26 is returned to the sedimentation tank 5, thereby reducing the moisture content of the recovered sand. is now being reduced. A sand discharge chute 30 for sliding down and discharging the sand discharged from the scooping and discharge section 26 is provided on the side surface of the sedimentation tank 5.

On the other hand, a sludge discharge path such as a gutter 31 or a pipe for receiving waste water containing sludge overflowing from the settling tank 5 is provided at an arbitrary position of the settling tank 5, and a sludge discharge pipe (not shown) is connected to the discharge port 32 of the gutter 31. 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, and this also belongs to the present invention.

This embodiment configured as described above operates as follows.

The driving force of the motor 19 with a speed reducer is transferred to the cylindrical portion 1 of the wrapper-type discharge chute 13 via the endless chain 18.
4, and the separation drum 1 is transferred to the support rollers 15, 16.
Rotate on top.

A raw material supply pipe 3 is connected to the raw material supply port 8 of the separation drum 1.
3 is inserted, and through this raw material supply pipe 33, the separation drum 1 is supplied with wastewater after washing raw materials such as raw concrete and mixer trucks.

In the rotating separation drum 1, the raw material is first lifted up by the agitator 22 and dropped to break the mud lumps in the raw material, separate it into large diameter and small diameter, and at the same time promote the separation of the sludge component. . At this time,
The overflow prevention blade 21 is for returning the raw material into the separating drum 1 so that the raw material does not come out of the separating drum 1.

The raw materials stirred in this manner are transferred by the internal feed blades 23 toward the discharge port 11, and while being transferred, sand and sludge come out of the separation holes 24 of the separation drum 1 and fall into or pass through the settling tank 5. Then, the gravel is separated in the separation drum 1. Then, this gravel is lifted by a lifting body 25 and slid down on the conical chute 12, and then slid down on the trumpet-shaped chute 13 from the discharge port 11 to be discharged.

On the other hand, the sand and sludge that have fallen into or passed through the sedimentation tank 5 are sedimented and separated due to the difference in specific gravity, and the external feed blade 4 scoops up the settled sand to the scooping position of the discharge section 26, and scoops up the raked sand. The scooping section 27 of the lifting and discharging section 26 scoops up the sand, and while the scooping and discharging section 26 rotates, water falls into the sedimentation tank 5 from the drain hole 29, and the sand with a low moisture content discharged from the scooping and discharging section 26 is scooped up. The discharge chute 30 is slid down and discharged.

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.
1 through a discharge port 32 and a discharge pipe (not shown).

By the way, the sand scooping and discharging section is provided at an arbitrary position on the separation drum 1, for example, at the third
As in the other embodiment shown in the figure, the scooping and discharging section 26 is provided approximately at the center of the separation drum 1, and the transfer direction of the outer feeding blade 4A is from both sides of the scooping and discharging section 26 to the scooping and discharging section. It may be formed in two directions toward 26. As described above, according to the scooping and discharging unit of the present invention, the removal position of the small-diameter objects to be taken out can be set at any position in the length direction of the separation drum, so that there is no problem with the installation layout. Since the scooping and discharging section 26 is located approximately at the center of the outer sending blade 4A, the load applied to the separation drum 1 is not biased compared to the case where the scooping and discharging section 26 is located near one end of either side of the outer sending blade 4A. It has the advantage of being highly durable.

Furthermore, as another embodiment, as shown in FIG. This has the advantage of calming the raw material and improving the degree of sedimentation of fine sand. In FIGS. 3 and 4, the members designated by the same reference numerals as in FIG. 1 are the same as the corresponding members in FIG. 1, and therefore their explanations will be omitted.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the outer feeder blade 4 and the inner feeder blade 23 are not limited to continuous spiral blades,
The blades consisting of a plurality of pieces may be arranged at intervals in a substantially helical manner, and a cover may be provided over the settling tank to cover the separation drum and the outfeeding blades. It belongs to the present invention.

(Effects of the Invention) In the present invention, while the internal feed blade transports the raw material toward the discharge hole, small-diameter objects and sludge fall through the separation hole of the separation drum into the sedimentation tank, and large-diameter objects and sludge remain in the separation drum. The lifting body lifts the objects and discharges them from the discharge port, while the external feed blade scoops up small-diameter objects that have settled in the sedimentation tank to the position of the scooping and discharging section, and discharges them from the scooping and discharging section, making it a compact classifier. It is possible to classify raw materials into large-diameter products, small-diameter products, and sludge, which reduces the area occupied by the machine, simplifies maintenance, and reduces manufacturing costs.

Since the separation drum is a cylindrical body with the same diameter,
The volume of the sedimentation tank can be increased compared to a conical sedimentation tank, and the installation footprint is reduced accordingly. Further, when the occupied area is the same, the volume of the settling tank increases accordingly, so the residence time of the raw material becomes longer, the sludge fraction is better separated, and the quality of the recovered aggregate is improved.

Since the bucket-shaped scooping part can be installed at any position on the outer periphery of the separation drum, the removal position of large-diameter objects to be collected can be set arbitrarily, increasing the degree of freedom in the installation layout of the device, and reducing the amount of sediment. There is no problem with the installation layout due to the removal position.

Further, since the stirring body is provided, the destruction of mud lumps and the separation of sludge components are also promoted.

Furthermore, when the scooping and discharging section is provided approximately at the center of the separation drum, and the direction of transfer of the outward feeding blades is formed from both sides of the scooping and discharging section toward the scooping and discharging section, the outward feeding Compared to the case where the scooping and discharging section is located near either end of the blade, the load applied to the separation drum is not biased and the durability is excellent.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the present invention. FIG. 2 is a front view of FIG. 1. FIG. 3 is a cross-sectional view of another embodiment. FIG. 4 is a schematic vertical sectional view of yet another embodiment. 1: Separation drum, 4: External feed blade, 5: Sedimentation tank, 8: Raw material supply port, 11: Discharge hole, 12: Ruppet type chute, 13: Conical chute, 22: Stirring body, 23: Internal feed Blade, 24: Separation hole, 25:
Lifting body, 26: scooping and discharging part.

Claims (1)

[Scope of Claims] 1. A cylindrical separation drum of equal diameter that is rotatably provided, a raw material supply port opened in the separation drum and to which ready-mixed concrete waste water is supplied, and a supply port from the raw material supply port into the separation drum. an inner feeding blade provided in the separation drum to transfer the raw material supplied to the separation drum to the other end side of the separation drum; and an agitator partially provided inside the separation drum on the raw material supply port side. , A large number of separation holes are formed in the peripheral plate of the separation drum so that solids such as gravel and sand in the raw materials sent by the internal feed blade are separated by a diameter difference, and large-diameter objects are left in the separation drum. and a lifting body provided radially on one end surface side of the separation drum to lift the large-diameter object transferred by the inner feeding blade, and a lifting body that lifts the large-diameter object lifted by the lifting body to the outside of the separation drum. a conical chute formed on the other end surface of the separation drum for discharge; a discharge chute for guiding the large-diameter objects discharged from the conical chute to the outside; A sedimentation tank whose inner surface is partially circular with equal diameter for sedimentation and separation of small-diameter objects; A one-way or two-way outward feeding blade is provided on the outside of the peripheral plate of the separation drum so as to be able to rotate integrally with the separation drum, and the sediment scraped up by the external feeding blade is scooped up and discharged to the outside of the sedimentation tank. A bucket-shaped scooping and discharging section is provided integrally and rotatably at a predetermined position on the outer periphery of the separation drum, and a bucket-shaped scooping and discharging section is provided on the side surface of the sedimentation tank to receive the sediment that falls from the scooping and discharging section. A classifier for collecting aggregates, comprising: a discharge chute provided therein; and a discharge port through which wastewater overflowing from the settling tank is discharged.