JP2001150426A - Apparatus for manufacturing ready mixed concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture ready mixed concrete of desired physical properties by utilizing a crushed material obtained from broken (or crushed) waste concrete as an aggregate in which the material is thoroughly distributed from rough particles to fine particles and kneading the aggregate with water and cement. SOLUTION: The apparatus for manufacturing ready mixed concrete comprises a breaker 3 for breaking a concrete lump, and a kneader 4 for kneading the broken material broken by the breaker 3 with separately supplied cement and water. The apparatus has and a broken material metering unit 5 for metering the material supplied to the kneader 4, or a concrete lump metering unit 6 for metering the concrete lump supplied to the breaker 3, or a weight measuring means 7 of the kneader.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing ready-mixed concrete for crushing waste concrete and effectively utilizing it as aggregate.

[0002]

2. Description of the Related Art When crushed concrete waste material (hereinafter referred to as waste concrete) is crushed by a crusher, crushed materials uniformly distributed from coarse particles to fine particles can be obtained. (See FIG. 1), it has been studied to use it for concrete aggregates, that is, coarse aggregates and fine aggregates.

[0003]

In the case of producing ready-mixed concrete using this waste concrete, it is conceivable to temporarily stock the crushed material and use a part of the stock. In the above, fine aggregates are located at the bottom and coarse aggregates are located at the top, so that aggregates with the ideal particle size distribution as described above (that is, aggregates distributed uniformly from coarse to fine particles) can be obtained. And it cannot be used as a mixed material for concrete.

[0004] The present invention has been developed in view of the above points, and an object of the present invention is to uniformly crush a material obtained from crushed (or pulverized) waste concrete from coarse particles to fine particles. It is an object of the present invention to provide an apparatus for producing ready-mixed concrete which can be used as a distributed aggregate and kneaded with water and cement to produce ready-mixed concrete having desired properties.

In order to effectively achieve the above object, the present invention has the following configuration. That is, the apparatus for producing ready-mixed concrete of the present invention according to claim 1 includes a crushing unit for crushing a concrete mass, a kneading unit for kneading the crushed material crushed by the crushing unit, and separately supplied cement and water. It is the structure which consists of.

According to a second aspect of the present invention, there is provided a ready-mixed concrete manufacturing apparatus according to the first aspect, wherein the kneading section is disposed below the crushing section.

According to a third aspect of the present invention, there is provided a ready-mixed concrete manufacturing apparatus according to the first or second aspect, further comprising a crushed material measuring section for measuring the crushed material supplied to the kneading section. Configuration.

According to a fourth aspect of the present invention, there is provided a ready-mixed concrete manufacturing apparatus according to the first or second aspect, further comprising a concrete lump measuring section for measuring a concrete lump supplied to the crushing section. Configuration.

According to a fifth aspect of the present invention, there is provided an apparatus for producing ready-mixed concrete according to the first or second aspect, further comprising a weight measuring means for the kneading section.

FIG. 1 shows the variation in the particle size among the crushed materials when a plurality of waste concretes having the same strength are crushed under the same blade width condition.
mm indicates the minimum value of the gap (width) between the fixed blade of the crusher and the cutting edge of the movable blade, and the blade width of 15 mm indicates the maximum value.
According to this figure, there is no variation in the particle size between each pulverized material,
It can be seen that, if waste concrete having the same strength is pulverized under the same blade width conditions, a constant particle size can be obtained, and a pulverized product of stable quality can be supplied. In addition, the particle size distribution is evenly distributed from the large diameter to the small diameter, which indicates that the material is suitable as an aggregate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are shown in FIGS.
Description will be made based on 0. As shown in FIG. 3, the ready-mixed concrete manufacturing apparatus 1 of the present invention includes a crusher (crushing unit) 3 provided on an upper portion of a gantry 2 and a mixer (kneading unit) 4 provided directly below the crusher 3.

In the ready-mixed concrete production apparatus 1, the entire amount of the crushed material crushed by the crusher 3 is put into the mixer 4, and the crushed material is agitated by the mixer 4 and the crushed material is evenly distributed from coarse particles to fine particles. It can be kept in a distributed state and can be used as a mixed material of concrete instead of aggregate (fine aggregate, coarse aggregate).

A weighing hopper (crushed material measuring section) between the crusher 3 and the mixer 4 for measuring the crushed material.
If 5 is provided, waste concrete can be crushed by a required amount. For this reason, it becomes possible to mix the crushed material obtained by crushing the waste concrete with water and cement, and it is possible to stably produce concrete having desired properties.

FIG. 2 shows a flow of manufacturing ready-mixed concrete by the ready-mixed concrete manufacturing apparatus 1 (see FIG. 3).

That is, in FIG. 2, waste concrete is charged into the crusher 3 to crush the waste concrete to produce a crushed material. The crushed material is dropped and thrown into a weighing hopper (crushed material measuring section) 5 provided below the mixer 4 to measure the weight of the crushed material. Next, whether or not the weight of the crushed material is a predetermined value is determined by an automatic control device (not shown) or the like,
If the predetermined value is not satisfied, waste concrete is charged into the crusher 3 again, and the operation of creating crushed material is repeated.

On the other hand, if the crushed material satisfies a predetermined value, the crushing by the crusher 3 is stopped, the measured crushed material is put into a mixer 4 provided below, and other materials kneaded with the predetermined value of the crushed material are mixed. Water, cement, and an admixture (water reducing agent) are put into the mixer 4 by predetermined amounts and kneaded to produce ready-mixed concrete of predetermined properties. After kneading with the mixer 4 for a predetermined time, the produced ready-mixed concrete is discharged from the mixer 4 and transported to a desired place by a transporting means such as a backhoe or a dump truck.

If a hopper (concrete lump measuring section) 6 for measuring the concrete lump of waste concrete is provided on the crusher (crushing section) 3 as shown in FIG. Can be manufactured stably.

FIG. 4 shows a flow of manufacturing ready-mixed concrete by the ready-mixed concrete manufacturing apparatus 1 (see FIG. 5).

That is, in FIG. 4, waste concrete is put into a weighing hopper (concrete lump measuring section) 6, and the weight of the waste concrete is measured. It is determined whether the weight of the weighed waste concrete is a predetermined value. If NO, the waste concrete is further charged into the weighing hopper 6, and this operation is repeated until the weight reaches the predetermined amount.

On the other hand, if the crushed material satisfies a predetermined value, the waste concrete in the weighing hopper 6 is charged into the crusher 3 and crushed. The crushed waste concrete is put into the mixer 4 (fall). An automatic controller (not shown) determines whether or not all the waste concrete in the weighing hopper 6 has been crushed.
In the case of O), the next work is kept on standby until the crushing of the input waste concrete by the crusher 3 is completed.

When all the waste concrete in the weighing hopper 6 has been crushed (in the case of YES), the crusher 3
To stop waste concrete crushing work. At the same time, other materials (water, cement, admixture) in a mixing amount corresponding to the total amount of the crushed waste concrete charged into the mixer 4 are charged into the mixer 4 and kneaded for a predetermined time. When ready-mixed concrete of desired properties is produced by kneading, it is discharged from the mixer 4 and transported to a desired location by a transporting means such as a backhoe or a dump truck.

Next, in the ready-mixed concrete manufacturing apparatus 1 of the present invention shown in FIG. 9, the weight of the mixer 4 is directly measured without the hoppers (measuring units) 5 and 6 (measured after the crushed material is charged).
The weight measuring means 7 for measuring the weight of the mixer 4 is provided. In the ready-mixed concrete manufacturing apparatus 1 having this configuration, the hoppers (measuring units) 5 and 6 can be omitted, the apparatus 1 can be simplified, and the height can be reduced.

Further, the apparatus for producing ready-mixed concrete of the present invention has a configuration as shown in FIG. That is,
In this ready-mixed concrete production apparatus, a belt conveyor is provided between the crusher and the mixer. The concrete mass, which is waste concrete, is crushed by a crusher, and the crushed material is conveyed to a mixer by a belt conveyor and charged, and an appropriate amount of water and cement is also charged to the mixer and kneaded to produce a desired property. Concrete can be manufactured.

Referring to FIG. 10, FIGS. 2 and 4 described above adjust the amount of crushed material to a predetermined value.
In this example, the amount of water, cement and admixture (water reducing agent) is adjusted. That is, the waste concrete is put into a crusher to be crushed, and the crushed material is put into a weighing hopper 5.
(See Fig. 3) to crush waste concrete and measure the crushed material. The amount of other materials (water, cement, and admixture) to be added to the measured amount of the crushed material is determined by an automatic control device (not shown) or by the judgment of an operator. The determined amount of water, cement, and admixture are put into the mixer 4 together with the crushed material, and kneaded to produce a ready-mixed concrete of a desired property, carried out of the mixer 4 and transported to a desired place by various transportation means. I do.

In the ready-mixed concrete manufacturing apparatus 1 of the present invention, the weighing hopper 5 (crushed material measuring section) (FIG. 3)
In the case of the weighing method described in (1), when the weighing hopper 5 is provided below the crusher 3, the crushed material may be weighed by volume or by weight.

In the case of volume measurement, a scale is placed at a predetermined volume of the weighing hopper 5 and the crusher 3 is stopped when the upper surface of the crushed material comes (visual or measurement). It should be noted that the setting may be such that the time when the hopper is full becomes a predetermined amount.

In the case of weight measurement, the weight of the crushed material is detected by a load cell (load meter). In this case, the crusher 3 and the weighing hopper 5 are cut off.

As described above, the weighing hopper (concrete lump measuring section) is placed on the crusher (crushing section) 3 as described above.
When there is 6, the volume measurement of the crushed material is impossible, and only the weight measurement is possible.

Further, the above-mentioned crusher (crushing section)
As 3, a jaw crusher, a cone crusher, a roll crusher, or the like as shown in FIG. 6 may be used.

The mixer (kneading unit) 4 may be of any known type.

For the determination of the mix of crushed material, water, cement, and admixture (water reducing agent) of waste concrete,
It is determined as shown in FIG.

[0032]

As is apparent from the above description, by using the ready-mixed concrete manufacturing apparatus of the present invention, the whole crushed concrete mass crushed in the crushing section is put into the kneading section. Therefore, it is possible to maintain a state in which the crushed material is evenly distributed from the coarse to fine particles, and the crushed concrete mass can be used instead of the aggregate as the concrete mixing material.

By arranging the kneading section below the crushing section, the crushed concrete lumps can be smoothly introduced into the kneading section, and the work of producing ready-mixed concrete can be performed efficiently.

Further, if a crushed material measuring section for measuring crushed material is provided between the crushing section and the kneading section, crushing can be performed only in a required amount, and a blending plan with other materials can be achieved. Concrete can be stably manufactured.

Also, by providing a concrete lump measuring section for measuring the concrete lump to be supplied to the crushing section, it is possible to crush only a required amount, and to mix with other materials, and to mix concrete with a desired property. It can be manufactured stably.

If the weight measuring means of the kneading section is provided, the above-mentioned crushed material measuring section and concrete lump measuring section can be omitted, and the whole apparatus can be downsized.

[0037]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the relationship between the standard particle size of aggregate and the particle size of crushed concrete.

FIG. 2 is a flow chart of a method for manufacturing ready-mixed concrete when the apparatus for manufacturing ready-mixed concrete according to an example of the present invention is used.

FIG. 3 is an explanatory diagram of an apparatus for producing ready-mixed concrete according to an example of the present invention.

FIG. 4 is a flow chart of a method of manufacturing ready-mixed concrete when using a ready-mixed concrete manufacturing apparatus according to another embodiment of the present invention.

FIG. 5 is an explanatory view of a ready-mixed concrete manufacturing apparatus according to another example of the present invention.

FIG. 6 is an explanatory diagram of various crushers.

FIG. 7 is a flowchart showing a flow of a blending decision.

FIG. 8 is a simplified explanatory diagram of another example of a ready-mixed concrete manufacturing apparatus of the present invention.

FIG. 9 is an explanatory view of still another example of a ready-mixed concrete manufacturing apparatus of the present invention.

FIG. 10 is a flowchart in the case where ready-mixed concrete is manufactured by the ready-mixed concrete manufacturing apparatus shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ready-mixed concrete manufacturing apparatus 3 Crusher (crushing part) 4 Mixer (kneading part) 5 Hopper for measurement (crushed material measuring part) 6 Hopper for measurement (concrete lump measuring part) 7 Weight measuring means

Claims (5)

[Claims] 1. An apparatus for producing ready-mixed concrete comprising a crushing unit for crushing a concrete block, and a kneading unit for kneading crushed material crushed by the crushing unit, separately supplied cement and water. 2. The apparatus for producing ready-mixed concrete according to claim 1, wherein the kneading section is disposed below the crushing section. 3. A crushed material measuring section for measuring crushed material supplied to the kneading section is provided.
An apparatus for producing ready-mixed concrete as described. 4. The ready-mixed concrete production apparatus according to claim 1, further comprising a concrete lump measuring section for measuring a concrete lump supplied to the crushing section. 5. The apparatus for producing ready-mixed concrete according to claim 1, further comprising a weight measuring means for the kneading section.