JPH0796219B2 - Equipment for manufacturing raw concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to kneading materials such as cement, water, sand, gravel,
The present invention relates to a manufacturing device for manufacturing mortar and ready-mixed concrete such as ready-mixed concrete using additives.

The applicant of the present application proposes a new device consisting of a preliminary kneading mixer and a main kneading mixer, which can obtain a sufficient consistency with a kneading time of 1/3 to 1/2 as compared with the case where the conventional manufacturing device is used. (See Japanese Patent Publication No. 62-20004). The present invention is a further improvement and development of this proposed device, which is characterized by a water metering means including a primary water meter and a secondary water meter for measuring water from a water tank. An additive metering means for metering the additive from the additive tank, a primary kneading mixer for previously kneading the primary water and other mixed materials from the water metering means, and a series to the subsequent stage of the primary kneading mixer. And a secondary kneading mixer for kneading again the secondary water from the water measuring means, the additive from the additive measuring means and the remaining mixed material, and kneading again, and the primary mixing It is an apparatus for producing ready-mixed concrete having a secondary kneading mixer structure that is driven by a power source different from the kneading mixer and is driven in a lower speed range than the primary kneading mixer.

One of the main improvements is a device for supplying various mixed materials to the primary kneading mixer and the secondary kneading mixer, for which the water measuring means and the additive measuring means have been improved. One of them is an improvement in forming a secondary kneading mixer structure that is driven in a lower speed range than the primary kneading mixer.

The preferred manufacturing apparatus according to the present invention is a sand surface treatment for removing adjusted clay and air bubbles and unnecessary substances from the surface of sand prior to kneading to obtain adjusted sand that has been treated to the best sand surface condition. Machines are provided. A primary kneading mixer for kneading the adjusted sand and a part of the kneading water (primary water) and other mixed materials is provided, and after kneading these various mixed materials in advance with the primary kneading mixer. Manufacture of ready-mixed concrete that is equipped with a secondary kneading mixer that mixes with the remaining kneading water (secondary water) and additives and the remaining mixed material and kneads again afterwards, and is further kneaded using this secondary kneading mixer It is an excellent manufacturing device that can obtain good ready-mixed concrete that cannot be obtained by the previously proposed device.

Hereinafter, a concrete producing apparatus and a concrete example of producing the concrete will be described with reference to the accompanying drawings.

In FIG. 1, a coarse aggregate silo 1 has a discharge gate at a lower portion, stores coarse aggregate such as gravel inside, and a pull-out belt conveyor 3 for conveying the coarse aggregate is disposed below. There is. The sand silo 2 has a discharge gate at the bottom, stores sand inside, and has a pull-out belt conveyor 4 for transporting sand below. A sand surface treating machine 5 for artificially treating the sand surface in a natural state to obtain adjusted sand having a uniform surface state is further arranged at the end portion of the pull-out belt conveyor 4. This sand surface treatment machine 5
May be a sand controller that removes clay and air bubbles and wastes from the surface of sand by utilizing centrifugal force. The inclined belt conveyor 6 conveys the sand discharged from the santo controller 5 and the coarse aggregate conveyed from the drawing belt conveyor 3 to the upper part of the concrete manufacturing apparatus.

In FIG. 2, the turn head chute 10 has a function of turning in the horizontal direction, and
The adjusted sand and coarse aggregate transported in the above are selected and put into a dedicated storage tank for each aggregate according to their type. Code 11-
Reference numeral 15 denotes each storage tank for various kneading materials, and the sand storage tank 11 and the coarse aggregate storage tank 13 have a receiving port in the upper part and a discharge gate (not shown) which is opened and closed by a fluid pressure cylinder in the lower part. . A rotary valve for discharging a certain amount of cement while being rotationally driven by an electric motor is attached to the lower part of the cement storage tank 12, and has a receiving port (not shown) connected to a carrying-in means for carrying in cement from the outside. The water tank 14 and the additive tank 15 have a discharge valve, which is not shown, opened and closed by a fluid pressure cylinder and a solenoid at the lower part thereof, and are connected by a pipe to a pumping means for pumping water and the additive from the outside. There is. Reference numerals 16 to 22 represent respective measuring instruments for measuring various kneading materials in a predetermined mixing ratio. The measuring tanks of the sand measuring device 16 and the coarse aggregate measuring device 18 have a discharge gate at the bottom thereof which is opened and closed by a fluid pressure cylinder. The measuring tank of the cement measuring device 17 has a rotary valve attached to the bottom thereof. Each of the measuring tanks of the water measuring means consisting of the primary water measuring device 19 and the secondary water measuring device 20 and the additive measuring device consisting of the first additive measuring device 21 and the second additive measuring device 22 has a fluid pressure at its lower part. It has a discharge valve that opens and closes with a cylinder and solenoid. In addition, each additive whose metering has been completed is discharged to each water metering tank whose metering has already been completed, and is supplied together with each water from the discharge valve of each water metering tank into each kneading mixer. The secondary water and the secondary additive to be supplied to the secondary kneading mixer 25 are continuously supplied into the secondary kneading mixer via the cushion tank 28, the outflow amount adjusting valve and the flow meter 29.

The batch-type mixer, which is a primary kneading mixer, is for kneading while holding various kinds of mixed materials in desired amount units inside the drum for a predetermined time. A chute and pipes for guiding various mixed materials from the measuring tank to the inside of the drum are arranged, a discharge gate that opens and closes with a fluid pressure cylinder is provided under the chute, and an arm and scraper are provided on the drive shaft in the center of the drum. It is rotated by an electric motor provided outside to knead various mixed materials. That is, the batch type mixer 23 performs kneading in advance.

On the other hand, the continuous system mixer which is the secondary kneading mixer continuously discharges the kneaded material which has been sufficiently kneaded from the other outlet while continuously feeding various mixed materials from the inlet, The continuous mixer 25 of the present embodiment is a cover having a case having a substantially U-shaped cross section and a rotating shaft which is laterally suspended and supported and provided with stirring blades, and an inlet for various mixed materials disposed on the case. And a motor for rotating the rotary shaft, a series of power transmission devices, and a hopper 24. The semi-kneading completed substance previously kneaded in the batch type mixer 23 in advance is supplied from the input port of the continuous type mixer 25 via the hopper 24, and the secondary water and the second water from the cushion tank 28 newly supplied. While being further kneaded with the two additives, they are sequentially sent toward the discharge chute 26 to complete the kneading. The ready-mixed concrete, which is a completely kneaded substance that has been completely kneaded, is discharged into the discharge chute.
It is mounted on the carrier 27 via 26. The hopper 24 shown is
It is used to temporarily store the semi-kneading completed substances previously kneaded in advance by the batch type mixer and, if necessary, adjust the kneading time and then lead to the continuous type mixer. Has a gate whose opening and closing degree can be adjusted with a fluid pressure cylinder.

Next, an example of producing mortar will be described.

First, the sand stored in the sand silo 2 is transferred to and stored in a storage tank 11 by operating the inclined belt conveyor 6, and similarly, cement, water, and additives are also stored in each dedicated tank. At this time, the series of conveying devices are automatically operated by a signal emitted from a level detecting device attached to a dedicated storage tank for various kinds of mixed materials, and always keep a storage amount of a desired amount or more. By the way, the sand is sent to the storage tank 11 after being adjusted through the sand controller 5, and the surface of the sand is made uniform in a low water content state. Further, when various kinds of sand are conveyed through the inclined belt conveyor 6, the turn head chute 10 is turned so as not to mix various kinds of sand, and each of the sands is guided to the dedicated storage tank.

Next, in order to perform the kneading in advance in advance, various mixed materials are weighed from each storage tank at a predetermined mixing ratio, and then the primary kneading mixer
It is supplied to 23 and kneaded while staying for a predetermined time, and the kneading is continued so that the sand is wrapped with the cement paste having a low water content. The secondary water and the second additive are also weighed at the same time during the kneading, and the secondary water and the second additive which have been weighed are transferred to the cushion tank 28 and stored therein. The semi-kneading completed substance that has been kneaded by the primary kneading mixer is transferred to the hopper 24 and stored, and then continuously supplied to the secondary kneading mixer while simultaneously supplying the secondary water and the second additive to the semi-kneading completed substance. It is supplied by adjusting the flow meter 24 and the adjusting valve so that the amount becomes proportional to the amount. The mortar, which is the true kneading completed substance that has been kneaded in the secondary kneading mixer, is sequentially discharged from the discharge chute 26 and placed on the transport vehicle 27.
Thereafter, the above operation is repeated to continuously produce mortar.

It is clear from the following performance comparison that the apparatus for producing ready-mixed concrete described above is excellent. That is, the performance comparison of ready-mixed concrete when using the conventional manufacturing apparatus and when using the manufacturing apparatus of the present invention is shown in Table 1 of the attached sheet.
It is shown in.

Note that this performance comparison is a comparative numerical value that can be similarly applied to the case of mortar.

As another example of the manufacturing apparatus, the secondary kneading mixer may be a batch-type mixer, which is preferable because it can have a mixed material supply structure similar to that of the primary kneading mixer (batch-type mixer). It may be omitted. In this case, the cushion tank 28, the flow meter 29, and the flow rate adjusting valve may be omitted. Furthermore, the water metering tanks 19 and 20 and the additive metering tanks 21 and 22 may be provided one by one, and the discharge valve may be of a switching type so as to supply the water to both the primary kneading mixer and the secondary kneading mixer. It is also possible to perform cumulative measurement as a two-tank type weighing machine and perform four types of weighing with two weighing machines. Further, the sand controller 5 may be installed at a position where the sand is loaded into the sand silo 2 or at the upper part of the sand storage tank 11. In addition, a means for pumping the true kneading completed material, which has been kneaded by the secondary kneading mixer 25, to a target place by a concrete pump or the like via an agitator for temporarily storing while performing slow stirring. Good.

The additives supplied to the additive tank 15 include a water reducing agent, a fluidizing agent, a retarding agent, a rust preventive agent ....

The manufacturing apparatus of the present invention configured as described above has a two-stage kneading process using a primary kneading mixer and a secondary kneading mixer, and by providing a dedicated mixer for each process, its action is effectively and reliably achieved. I chose Specifically, since the primary kneading mixer has a smaller amount of water added as compared with the kneading in the conventional mixer, the mixed material during kneading is extremely lacking in fluidity. On the other hand, the secondary kneading mixer has the same or slightly higher fluidity than the kneading in the conventional mixer.
Therefore, in the secondary kneading mixer, when the kneading rotation speed is increased, the fluidity of the mixed material is remarkable, so that a separation phenomenon occurs, but in the primary kneading mixer, the kneading rotation speed can be increased because the fluidity is low. Is. However, forming a secondary kneading mixer structure that is driven at a lower speed than the primary kneading mixer leads to improvement of the kneading effect and improvement of the quality of ready-mixed concrete. Can be obtained at.

Further, by using a batch type mixer as the primary kneading mixer, it is possible to easily hold a mixed material for a long time inside the drum, which is difficult with a continuous type mixer, and it is extremely easy to control the holding time, and batch measurement is possible. Therefore, it is possible to reliably obtain an accurate mixing ratio of the mixed material and stable kneading performance.

Furthermore, when a continuous mixer is used as the secondary kneading mixer, the amount of work for adjusting the supply of the mixing material supply device is adjusted by the trial kneading and the data of the trial kneading to improve the accuracy of the mixing ratio, which was performed by the conventional mixer. Becomes unnecessary,
Work efficiency is dramatically improved. Furthermore, since the secondary kneading mixer has a smaller effect on the quality of fresh concrete than the primary kneading mixer, it is economical to use it when continuously supplying concrete such as a concrete placing ship. Is also rational.

[Brief description of drawings]

Firstly, the silo and the transfer section in the manufacturing apparatus according to the present invention are provided.
The kneading part is shown in FIG. 5 …… Sand surface treatment machine (sand controller) 19 …… Primary water meter Water meter 20 …… Secondary water meter Water meter 21 …… First additive meter Additive meter 22 …… Second Additive measuring device Additive measuring means 23 …… Primary kneading mixer (batch type mixer) 24 …… Hopper 25 …… Secondary kneading mixer (continuous type mixer) 28 …… Cushion tank 29 …… Flowmeter

Claims (2)

[Claims] 1. A water measuring means comprising a primary water measuring device and a secondary water measuring device for measuring water from a water tank, an additive measuring device for measuring an additive from an additive tank, and the water measuring device. A primary kneading mixer for previously kneading the primary water and other mixed materials from the means, and the secondary water from the water measuring means and the additive disposed in series in the subsequent stage of the primary kneading mixer. It is composed of a secondary kneading mixer for kneading again the additive and the remaining mixed material from the measuring means and kneading again, and is driven by a power source different from the primary kneading mixer and is slower than the primary kneading mixer. Equipment for producing ready-mixed concrete formed in a secondary kneading mixer structure driven in the area. 2. The apparatus for producing ready-mixed concrete according to claim 1, wherein the secondary kneading mixer is a continuous mixer.