JPS6227649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ready-mixed concrete production apparatus, and in particular, by producing mortar in advance and kneading the mortar and coarse aggregate with a gravity mixer capable of continuous mixing, the present invention relates to a ready-mixed concrete manufacturing apparatus. The present invention relates to a ready-mixed concrete production device that can produce high-quality ready-mixed concrete by taking advantage of the advantages of type mixing and gravity mixer.

Generally, when producing ready-mixed concrete,
Cement, fine aggregate (sand, etc.), coarse aggregate (gravel, etc.),
It is necessary to thoroughly knead various materials such as water and admixtures at predetermined mixing ratios, and it is necessary to uniformly mix and wet the cement in a short time while preventing aggregates from shifting or separating.

BACKGROUND ART Conventionally, batch-type and continuous-type methods have been adopted as methods for producing ready-mixed concrete.

The batch method is a series of operations in which one batch of materials is measured at a predetermined mixing ratio, supplied to a concrete mixer, kneaded all at once, and then transported out. A method of producing ready-mixed concrete.

On the other hand, the continuous type refers to a method in which each material is continuously supplied to a concrete mixer at a predetermined mixing ratio, and these are kneaded all at once to successively produce ready-mixed concrete.

In both of these methods, the supplied materials are mixed all at once in a concrete mixer, but in the batch type, fresh concrete is produced for each batch, so once mixing starts, The blending ratio cannot be changed. For example, if the water content of sand cannot be measured properly,
Even if there is an excess or deficiency in the amount of water mixed due to the amount of water supplied, it is not possible to add other materials or increase the amount of water during mixing, and the quality of ready-mixed concrete differs for each batch. There is a risk.

On the other hand, in the case of a continuous type, new materials are continuously supplied while kneading, so if an excess or deficiency in water content, etc. is found, the material supply system is immediately controlled and continued. It is advantageous in that the amount of each material supplied can be adjusted, and a predetermined mixing ratio can be quickly achieved to produce homogeneous ready-mixed concrete.

On the other hand, the concrete mixers employed in these systems can be roughly divided into forced mixing mixers and gravity mixers. More specifically, both types are used in the batch type, and a forced mixer is used in the continuous type.

A forced kneading mixer is a device that forcibly kneads materials supplied into a container using stirring blades or the like. On the other hand, a gravity mixer is one in which a container containing materials is rotated, and the materials are dropped into the container and kneaded.

These concrete mixers have the following advantages and disadvantages. Forced mixers require less time for mixing and less separation of aggregates, but since the materials are forcibly stirred, the blades and containers are subject to severe wear and damage due to coarse aggregates and the like, and electricity costs are high. Especially,
It cannot be applied to coarse aggregate due to the particle size. On the other hand, although the mixing performance of gravity mixers is slightly inferior to that of forced mixing, they have great advantages such as being able to mix large particle size aggregates and having low running costs, and are used in the production of concrete for dams. can be appropriately adopted.

As explained above, conventional ready-mixed concrete production equipment has advantages depending on the production method and the concrete mixer used, but there are also many disadvantages.
There has been a demand for a new ready-mixed concrete manufacturing device that can eliminate these problems as much as possible.

An object of the present invention is to manufacture mortar in advance and knead the mortar and coarse aggregate with a gravity mixer that enables continuous kneading, thereby achieving the advantages of continuous kneading and the advantages of a gravity mixer. To provide a ready-mixed concrete production device that can be utilized to produce high-quality ready-mixed concrete at low running costs.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the invention. As shown in the figure, 1 is a controller for operating and controlling the entire device, which will be described later, and 2 is a controller used for producing mortar when producing ready-mixed concrete, namely cement C, fine aggregate S, water W, and a mixing agent. This is a mortar manufacturing material supplying means for continuously supplying a predetermined amount of A and the like (indicated by the part surrounded by a two-dot chain line in the figure). More specifically, this mortar manufacturing material supply means 2 includes a fine aggregate supply system 3, a cement supply system 4, a water supply system 5, and an admixture supply system 6 for each material.

The fine aggregate supply system 3 includes a hopper 7 for accommodating and cutting out fine aggregate S to be carried in, and a hopper 7 for storing and cutting out fine aggregate S to be carried in, and water-containing fine aggregate by sprinkling water on the fine aggregate S cut out from the hopper 7.
Mainly consists of a water sprinkling device 8 for making Sw, and a moisture regulating device 9 for adjusting the moisture content so that the water-containing fine aggregate Sw carried out from the water sprinkling device 8 is in a homogeneous saturated wet state as a whole. configured. Specifically, the watering device 8 includes a conveyor 10 driven by a motor to transfer the fine aggregate S cut out from the hopper 7 to the moisture adjustment device 9, and the conveyor 1.
The water sprinkler 11 is for sprinkling water on the fine aggregate S transported by the 0. The moisture control device 9 also includes a known vibrating conveyor 13 with a vibrating transfer surface, which removes excess moisture from the transported fine water-containing aggregate Vw and conveys it to a mixer 12 for producing mortar, which will be described later. Moreover, a moisture meter 14 is provided on the discharge side to detect the moisture content in order to maintain the moisture content at a predetermined level. In addition, this moisture adjustment device 9 is equipped with a known belt scale 15 for detecting the weight of the material being carried out in order to maintain a predetermined amount of the water-containing fine aggregate Sw that is continuously carried out to the mixer 12 for post-mortar production. provided. The detection values of the belt scale 15 and the moisture meter 14 are input to the controller 1, which controls the cutting opening of the hopper 7 and the speeds of the conveyor 10 and the vibrating conveyor 13 to a predetermined value on the discharge side of the fine aggregate supply system 3. The structure is such that fine aggregate Sw with a water content is continuously carried out in a predetermined amount.

The cement supply system 4 also includes a hopper 16 for accommodating and cutting out the cement C carried in, and a conveyor 1 for carrying out the cement C cut out from the hopper 16 to the mortar manufacturing mixer 12.
It consists of 7. The conveyor 17 includes a belt scale 15 similar to that described above and a pulse oscillator 1.
The conveyor speed obtained by the pulse oscillator 18 and the material weight obtained by the belt scale 15 are input into the controller 1, and the conveyor speed is controlled along with the opening degree of the hopper 16 to dispense a predetermined amount of cement C. Constructed to be continuously discharged.

On the other hand, the water supply system 5 includes a water tank 19, a pump 20 for pumping water from the water tank 19, and a flow meter 21 for detecting the flow rate supplied from the pump 20.
and a flow rate control valve 22 that performs throttle control to maintain the flow rate constant according to the detected value of the flow meter 21, so that a predetermined amount of water W is continuously supplied to the mortar manufacturing mixer 12. configured.

The admixture supply system 6 includes a supply system having the same configuration as the water supply system 5 connected to an admixture tank 24 equipped with a stirring blade 23, and a predetermined amount of admixture A is supplied to the mixer 12 for mortar production. is configured so that it is continuously supplied.

The mixing ratio of each material mentioned above is set in advance in the controller 1, and the speed control of each conveyor and the flow rate control from the pump are controlled so that the actual discharge amount detected by the detector of each system corresponds to the predetermined mixing ratio. configured to be administered.

A mortar manufacturing mixer 12 for receiving and kneading the materials supplied thereto to manufacture mortar M is connected to the discharge side of the mortar manufacturing material supplying means 2 configured as described above. In this embodiment, a known forced kneading mixer is employed.
A forced mixing mixer with a lid can be used for mortar production with less wear and damage than for ready-mixed concrete production, and also requires less power consumption, so it can be operated at low running costs and exhibits its true value. This is because high-quality mortar without aggregate separation can be produced continuously in a short period of time. The mortar manufacturing mixer 12 is also configured such that its motor is controlled by the controller 1.

On the discharge side of this mortar manufacturing mixer 12,
Gravity mixer 2, which will describe the manufactured mortar M later
A mortar supply means 26 for continuously supplying mortar in a predetermined amount to the mortar 5 is connected to the mortar. This mortar supply means 26 is composed of a hopper 27 for accommodating the mortar M to be carried in, and a cutting device 28 such as a cutting valve or a rotary feeder, which is provided on the carrying-out side and is capable of controlling the cutting amount. The mortar M is discharged at a predetermined ratio to the coarse aggregate L supplied by the coarse aggregate supply means 29. The cutting device 28 is also configured to be operated and controlled by the controller 1.

On the other hand, as shown in the figure, in addition to the mortar manufacturing material supply means 2, this apparatus also includes a coarse aggregate supply means 2 for continuously supplying only coarse aggregate L in a predetermined amount.
9 is provided. This coarse aggregate supplying means 29 has the same configuration as the cement supplying system 4 described above except for the hopper 30 for storing and cutting out the coarse aggregate L to be carried in, and the controller 1 controls the mortar manufacturing material supplying means 2. The configuration is such that a predetermined amount of coarse aggregate L is continuously supplied to the gravity mixer 25 in correlation with the above.

As described above, the mortar supply means 26 carries out the pre-manufactured mortar M, and the coarse aggregate supply means 29 supplies the coarse aggregate L in parallel with mortar production.
A gravity mixer 25 capable of continuous kneading to achieve the present invention is installed on the discharge side of the mixer.

This gravity mixer 25 will be explained in detail. Second
As shown in the figure, the gravity mixer 25 rotates while continuously receiving mainly supplied coarse aggregate L and mortar M, and moves these materials upward along the inner circumferential surface 31a. A drum 31 performs so-called gravity-type kneading, in which the kneading device is sequentially dropped in the direction of gravity while stirring.
Lifters 32 are fixedly installed in the drum 31 at appropriate intervals in the circumferential direction and along the longitudinal direction, and are formed at a predetermined height to scrape up the material and promote stirring by the rotation of the drum 31. ...and drum 31
A spiral blade 34 is provided in a spiral shape along the longitudinal direction on the inner circumferential surface 31a of the drum 31, and partitions the inside of the drum 31 while forming a continuous conveying path 33 between them to continuously convey the ready-mixed concrete B. be done. When the drum 31 rotates, the lifter 32 actively scrapes up the coarse aggregate L that is exposed on the mortar M and attempts to separate it together with the mortar M, and causes it to fall, thereby suppressing aggregate separation as much as possible. It also functions to increase kneading efficiency. Further, the spiral blade 34 functions to partition the inside of the drum 31 at predetermined pitches, transport the ready-mixed concrete B in the manufacturing process at a constant speed, and continuously cut out a predetermined amount of ready-mixed concrete B. The gravity mixer 25 configured in this manner is configured such that its drum 31 is rotatably supported by the rotating drums 35, and is driven by a drive drum 36 driven by a motor. Therefore, by changing the motor speed, the amount of material discharged from the gravity mixer 25 per unit time is set.

In addition, 37 is a conveyor for carrying out manufactured ready-mixed concrete B to a work place or a concrete mixer truck or the like. In addition, in FIG. 1, the drum 31 has an annular sprocket 3 disposed around it.
8 and chain 39 to be driven by a motor.

The operation of the above configuration will be described.

As shown in FIG. 1, the mortar manufacturing material supply means 2 is controlled by a controller 1 in which the blending ratio and supply amount per unit time are set in advance, and includes cement C, water-containing fine aggregate Sw, water W, and admixtures. Materials such as A are subjected to processing such as measurement in each supply system, and these materials are continuously supplied to the mortar manufacturing mixer 12.

The mortar manufacturing mixer 12 sequentially receives and kneads the supplied materials, and continuously manufactures mortar M that does not contain coarse aggregate L. In particular, in this embodiment, a forced mixing mixer is employed, and a high-quality mortar M without aggregate separation can be produced in a short time by kneading at low running costs. The manufactured mortar M is sequentially carried out to the mortar supply means 26.

On the other hand, the coarse aggregate supply means 29 sequentially supplies a predetermined amount of coarse aggregate L to the gravity mixer 25 under the control of the controller 1 in parallel with mortar production. After that, the mortar supplying means 26 is also connected to the cutting device 2.
8, mortar M is supplied to the gravity mixer 25 at a predetermined ratio to the coarse aggregate L.

In the gravity mixer 25, the coarse aggregate L and mortar M are kneaded to produce ready-mixed concrete B.

By the way, in the present invention, the gravity mixer 25
By making continuous kneading possible, high-quality ready-mixed concrete B can be produced at low running costs by taking advantage of the advantages of continuous kneading and the gravity mixer. Conventionally, a forced mixer has been used for continuous kneading, but since the materials are kneaded all at once, the above-mentioned drawbacks have appeared, especially due to the inclusion of coarse aggregate. However, in this case, continuous kneading is adopted, mortar M is produced by a different route, continuous kneading of the mortar M and coarse aggregate L is achieved, and mortar M is sufficiently kneaded.
can be added to the coarse aggregate L and mixed in the gravity mixer 25, so that ready-mixed concrete B with less aggregate separation can be produced in the shortest possible time and at low running costs. Further, by employing the gravity mixer 25, it is possible to mix large-grain coarse aggregate, and it is possible to produce ready-mixed concrete B with various properties suitable for various construction works. Furthermore, since continuous mixing is adopted, it is possible to optimize the amount of mixed materials as needed while producing ready-mixed concrete B. For example, it is suitable for concrete for RCD construction method, which particularly requires moisture management in the aggregate. Can be hired appropriately.

The supplied coarse aggregate L and mortar M are kneaded by the gravity mixer 25 and are continuously carried out in a predetermined amount to the carrying out conveyor 37. More specifically, the material is moved along the inner circumferential surface 31a of the rotating drum 31, and is moved by lifters 32...
... is actively scraped up and dropped to perform gravity kneading. Lifter 32... is drum 3
By the rotation of 1, the coarse aggregate L that is about to be separated and exposed on the surface of the mortar M can be actively scraped up and dropped, allowing it to settle in the mortar M to prevent aggregate separation and improve kneading efficiency. . Further, the spiral blade 34 enables continuous kneading by the gravity drum 25, and can sequentially transport the fresh concrete B in a predetermined amount. In other words, the spiral blade 34 forms a series of conveyance paths 33 while dividing the inside of the drum 31, and can sequentially convey the falling material to the discharge side. Moreover, since the spiral blade 34 has a predetermined height, the capacity of each section is constant, and it is possible to receive substantially equal amounts of fresh concrete B and sequentially transport them to the conveyor 37. This spiral blade 34
By employing this, the kneading section can be formed to be substantially longer than the actual length of the drum 31, and the drum 31 can also be made smaller. The present invention is achieved by a gravity mixer 25 that enables this continuous kneading.

The present invention as described above can be appropriately applied not only to mobile-type concrete plants but also to fixed batch plants. Conventional batch mill plants require large-scale material storage equipment because they use a batch system, but by adopting this project, a continuous kneading system that can supply materials as needed has been adopted, and the plant has been made smaller. It can be done.

Next, a second embodiment of the present invention will be described.

As shown in FIG. 3, 2 is a material supply means for producing mortar. In this embodiment, a centrifugal type is adopted as the moisture regulating device 9 provided in the fine aggregate supply system 3, and the water-containing fine aggregate Sw brought into a homogeneous saturated wet state is temporarily stored in the hopper 40. After the moisture content is detected by the moisture meter 14, a predetermined amount is cut out and conveyed to the conveyor 41,
The cutting amount is controlled by the detected values of the pulse oscillator 18 and the belt scale 15, but is the same as in the first embodiment.

The features of this embodiment are that a gravity mixer is used instead of the forced mixing mixer used for producing mortar in the first embodiment, and this gravity mixer is used for producing ready-mixed concrete. This is because it is integrated into the gravity mixer of the embodiment. That is, in the present embodiment, the present invention is achieved by using only the gravity mixer 25 which enables continuous kneading. This gravity mixer 25 is
Although the structure is substantially the same as that of the first embodiment, a mortar production section 25a and a ready-mixed concrete production section 25b are formed in series from the carry-in side to the carry-out side along the longitudinal direction. And mortar manufacturing department 2
The pitch of the spiral blade 34 in 5a is set finer than that in the ready-mixed concrete production section 25b, and is configured to perform finer and more thorough mixing.

On the other hand, as shown in the figure, the coarse aggregate supply means 29 extends deeply into the gravity mixer 25 beyond the mortar production section 25a, and is provided such that its discharge end faces the ready-mixed concrete production section 25b. The other configurations are substantially the same as those of the first embodiment.

The operation of the above configuration will be described.

As shown in FIG. 3, the mortar manufacturing material supply means 2 supplies various materials to the mortar manufacturing section 25a of the gravity mixer 25. Mortar manufacturing department 25a
receives the supplied materials one after another and performs gravity kneading by the rotation of the drum 31 and the action of the lifters 32 . At this time, the spiral blade 34 formed with a fine pitch kneads the material finely and sufficiently, making it possible to produce a dense mortar with less separation of aggregate.

The manufactured mortar is directly transferred to the ready-mixed concrete manufacturing section 25b along the spiral blade 34 which functions as mortar supply means.
Coarse aggregate L is supplied to the ready-mixed concrete production section 25b by the coarse aggregate supply means 29, and is kneaded with mortar in the same manner as in the first embodiment to sequentially and continuously produce ready-mixed concrete B. That will happen.

It goes without saying that the second embodiment configured in this way also exhibits the same effects as the first embodiment, but in particular, the forced kneading mixer is omitted and only the single gravity mixer 25 is used. Continuous fresh concrete B
This has the advantage of further promoting reductions in equipment investment and running costs.

Note that the gravity mixer 25 is installed in the mortar manufacturing department 2.
5a and a ready-mixed concrete production section 25b, and the mortar production section 25a may be configured to operate at a higher rotation speed to produce denser mortar.

In summary, the present invention exhibits the following excellent effects.

(1) Continuous kneading is adopted, and this is achieved by a gravity mixer, which is configured to continuously knead mortar and coarse aggregate that have been pre-produced via a separate route, so there are advantages of continuous kneading. By taking advantage of this and the advantages of a gravity mixer, high-quality ready-mixed concrete with little aggregate separation can be produced at low running costs. That is, by employing continuous mixing, it is possible to mix mortar and coarse aggregate that have been thoroughly mixed in advance, so the mixing time can be shortened as much as possible, and ready-mixed concrete with as little aggregate separation as possible can be produced. Furthermore, by using a gravity mixer, compared to a forced mixing mixer, it is possible to achieve a significant reduction in consumables and power costs, thereby reducing running costs.

(2) Also, by using a gravity mixer, it is possible to mix large-grained coarse aggregate, and it is possible to produce ready-mixed concrete with a variety of properties suitable for various construction works.

(3) Furthermore, by employing continuous mixing, it is possible to optimize the mixing ratio, and it is possible to produce homogeneous and high-quality ready-mixed concrete.

(4) Furthermore, by adopting continuous kneading,
It is possible to downsize the material storage equipment, thereby achieving downsizing of the fixed batch plant, and it can also be suitably employed in mobile type plants.

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram showing a preferred embodiment of the present invention, FIG. 2 is a perspective view showing a gravity mixer employed in the present invention, and FIG. 3 is a diagram showing another preferred embodiment of the present invention. FIG. In the figure, 2 is a mortar manufacturing material supply means, 12
or 25a is a mortar manufacturing mixer, 25 or 2
5b is a gravity mixer, 26 or 34 is a mortar supply means, and 29 is a coarse aggregate supply means.

Claims (1)

[Claims] 1. Coarse aggregate for continuously supplying a predetermined amount of the above coarse aggregate in a ready-mixed concrete production equipment having a mixer that receives materials such as cement, fine aggregate, and coarse aggregate and mixes them all at once. supply means;
A mortar manufacturing material supply means for continuously supplying a predetermined amount of mortar manufacturing materials such as cement and fine aggregate; A mortar manufacturing mixer for receiving and kneading materials to manufacture mortar, and a mortar manufacturing mixer connected to the discharge side of the mortar manufacturing mixer to continuously supply mortar at a predetermined ratio to the supplied coarse aggregate. and a mortar supply means connected to the discharge side of the coarse aggregate supply means to receive and knead the supplied coarse aggregate and the mortar supplied from the mortar supply means to continuously produce ready-mixed concrete. Ready-mixed concrete production equipment characterized by being equipped with a gravity mixer.