JPS599854Y2 - Two-stage concrete mixing equipment using a variable speed mixer and a two-stage discharge water meter - Google Patents

Description

[Detailed description of the invention] This invention relates to a two-way concrete mixing device that mixes mortar first and then mixes aggregate into it, and aims to significantly improve the quality of concrete and the production efficiency of ready-mixed concrete. This is the purpose.

To explain the details with a diagram, the driving motor of the concrete mixer 1 is a variable speed motor 2, and among the sand measuring device 3, water measuring device 4, gravel measuring device 5, and cement measuring device 6 connected above the mixer body. , the water meter 4 is equipped with a water discharge valve 7 and its discharge valve cylinder 8 which detect the discharge weight with an electronic water discharge comparator 10 and open/close after control, and an AE agent meter 9 is connected thereto. This is what I did.

L indicates the full stroke of the water discharge valve, and l indicates the discharge height of the first stage of the water discharge valve.

The working method in concrete manufacturing plants is usually to feed gravel, sand, cement, water, and other materials into a mixer at the same time and mix them, but this concrete is produced by the so-called breathing phenomenon, which causes moisture to separate and rise, causing aggregate to settle. There were disadvantages such as the occurrence of cracks, variations in strength, and if the mortar was mixed in advance, the time for one cycle would be longer.

In this application, when the sand measuring device 3, water measuring device 4, gravel measuring device 5, and cement measuring device 6 in the plant finish measuring the mixed materials, sand and water are first discharged and supplied to the mixer 1. Ru.

At this time, the water discharge valve 7 of the water meter is opened by a quarter of its total stroke L, so that a small portion of the metered water is accurately supplied into the mixer.

An electronic water discharge comparator detects this loss, turns off the discharge signal, and closes the water discharge valve after supplying a small amount of water.

During this time, the mixer was rotating at a high speed four times its rated speed.
Knead for about 5 seconds.

Next, cement is discharged and supplied from the cement measuring device 6, and mixed with sand, cement, and a small amount of water in a mixer for about 5 seconds to knead mortar with a constant viscosity in a short time.

The total kneading time of this first stage is 10 seconds, which corresponds to 40 seconds of kneading at the rated rotation, and sufficient kneading is achieved.

Next, the variable speed motor 2 is decelerated to rotate the mixer at the rated low speed, the water discharge valve is fully opened, and the entire amount is supplied together with the AE agent, and at the same time, the aggregate is also supplied.

In this way, all of the remaining aggregate, AE agent, and water are supplied to the mixer in the second stage, and the mixture is kneaded for 20 seconds, subtracting the 10 seconds of mixing time in the first stage from the normal mixing time of about 30 seconds.
Since the aggregate is fed into the mortar which has already developed sufficient fluidity, the cross-mixing resistance is low and the time required is the same as the conventional method of simultaneously feeding all types of cross-wires, and it is also shorter than the conventional two-stage mixing method. The crosstalk is completed.

In this case, the effective crosstalk time is (10X4+20)=60 seconds.

As described above, by combining a variable speed mixer and a water meter with a two-stage discharge valve, two-stage cross-mixing can be performed efficiently, the separation and rise of water is small, and fresh concrete with fluidity and high strength can be produced efficiently. It is something that can be manufactured and has an effect.

[Brief explanation of the drawing]

The drawing is a side view of the device of the present invention. 1...Mixer, 2...Variable speed motor, 3...Sand scale, 4...Water scale, 5...Gravel Measuring instrument, 6... Cement measuring instrument, 7... Water discharge valve, 8... Discharge valve cylinder, 9... AE agent measuring instrument, 10.・
...Electronic water discharge comparator.

Claims (1)

[Scope of utility model registration request] The driving motor of the concrete mixer 1 is a variable speed motor 2, and a sand measuring device 3 is connected above the mixer body.
Of the water meter 4, gravel meter 5, and cement meter 6, the water meter 4 is equipped with a water discharge valve 7 and its discharge valve cylinder 8 that are controlled to open and close by an electronic water discharge comparator 10, and the AE agent is measured. A two-stage concrete crosstalk device using a variable speed mixer and a two-stage discharge water measuring device, characterized in that a container 9 is connected.