JPH0233281B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a laminated mixer for producing concrete, which aims to produce high quality concrete in as short a time as possible.

(Prior Art) Previously, the applicant used a device in which two pan-type mixers were placed one above the other, and produced mortar through primary kneading by the upper pan-type mixer, and then transferred the resulting mortar to the lower pan-type mixer. Discharge to type mixer,
He proposed an improved method for manufacturing concrete by adding gravel and secondary water and performing secondary mixing (Japanese Patent Publication No. 10886/1986).

This technology not only made it possible to produce high-quality concrete, but also shortened the production time (cycle time).

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the manufacturing time was shortened compared to the method using a single tank mixer, and the cycle time was about 40 seconds (Figure 5). In order to further shorten the cycle time, it has been necessary to shorten the kneading time and discharge time.

(Means for Solving the Problems) This invention solves the conventional problems by stacking a biaxial forced kneading mixer at the bottom of a pan-type mixer, and improving the bottom and discharge gate of the pan-type mixer. be.

That is, this invention provides a stacked mixer in which a pan-type mixer is installed in the upper stage and a biaxial forced kneading mixer is installed in the lower stage. Concrete characterized in that a sliding gage is provided, the discharge port faces above a two-shaft forced mixing mixer, and the two-shaft forced mixing mixer has a long discharge port with a gate provided in the center of the lower part thereof in parallel with the rotating shaft. This is a stacked mixer for manufacturing.

According to the above configuration, the upper and lower mixers can be placed as close together as possible, and the mortar from the upper mixer can be automatically and rapidly discharged to the lower mixer. However, even if the mixture is discharged all at once, there is no risk that the rising power will become abnormally large due to the characteristics of the two-shaft forced kneading mixer.

(Function) In the present invention, since the primary kneading for producing mortar is performed using a pan-type mixer, high-quality mortar can be obtained in a short time. In the pan-type mixer, the materials to be kneaded are kneaded at different angular velocities of forced movement in the center and outer periphery, so the kneading efficiency is further improved and the primary kneading time is the same compared to conventional technology. If so, mortar of higher quality than before can be manufactured.

Next, since the secondary kneading is performed using a two-screw forced kneading mixer, the product can be quickly discharged.
Incidentally, since the first kneading has been sufficiently performed, the second kneading does not require much time, and the kneading is completed when the gravel is evenly distributed and the mortar covers the gravel.

Examples of the present invention will be described below.

(Example) A pan-type mixer 2 is stacked above a biaxial forced kneading mixer 1. Said two-shaft forced kneading mixer 1
has a conventionally well-known structure, in which two rotating shafts 4, 4 are installed horizontally and parallel to each other in a kneading tank 3, and kneading blades 5 are protruded from both rotating shafts 4, 4. A product discharge gate 6 is provided at the center of the bottom width direction of the kneading tank 3 over the entire length of the kneading tank 3.

The bread-type mixer 2 has a rotating shaft 8 vertically fixed in the center of a cylindrical kneading tank 7 having a funnel-shaped bottom 7a, and an inner shaft 10 of the rotating shaft 8 is inserted into a hollow outer shaft 9. It is configured as follows. The inner and outer shafts 1
0 and 9 are rotated by a common motor 11, but the inner shaft 10 is configured to rotate at a higher speed than the outer shaft 9. The inner shaft 10 is provided with a kneading blade 12, and the outer shaft 9 is provided with an arm 13. A kneading blade 14 is attached through the kneading tank 7, and the material to be kneaded on the outer periphery of the kneading tank 7 is kneaded by the external kneading blade 14.

A discharge port 15 is provided in the center of the bottom 6 of the kneading tank 7, and the discharge port 15 is connected to a double-opening gate 1.
6, 16a so that it can be closed. The gates 16, 16a are mounted on rolls 17 so as to be horizontally movable.
The piston rod 18,
It is connected to the tip of 18a. Also gate 16,
A packing 19 is layered on the upper surface of the discharge port 16a, and a gate 16 is provided below the discharge port 15.
A device is provided to press 16a upward to ensure watertightness when it is closed. The pressing device may be one in which the upper ends of a plurality of piston rods 20, 20a are connected by a connecting bar 21.

Next, the operation of the implementation device will be explained.

The gates 16, 16a of the pan-type mixer 2 are moved in the directions of arrows 22, 22a in FIG. 6 in the direction of arrow 23 and open the discharge port 2.
Seal 4. In this state, primary water, cement, and sand are input through the material input port 25 of the pan-type mixer 2, but prior to inputting the materials, the primary water, secondary water, water reducing agent, cement, and gravel are measured. Among these, the procedure for measuring primary water, secondary water, and water reducing agent is as follows (see Figure 3).

First, from the primary water pipe 26 to the primary water measuring tank 27
Inject water into the tank and measure the primary water. (Weighing time 10
seconds). At the same time, the water reducing agent is injected from the water reducing agent pipe 28 into the water reducing agent measuring tank 29, and the water reducing agent is measured (metering time: 5 seconds). Next, a water reducing agent is injected into the secondary water measuring tank 30, and water is injected into the secondary water measuring tank 30 from the secondary pipe 31 and cumulatively measured together with the primary water (metering time: 10 seconds).

When the measurement is completed, sand, primary water, and cement are poured into the kneading tank 7 of the pan-type mixer 2 that is in operation (11 seconds until completion), and at the same time, the secondary water in the secondary water measuring tank 30 and The water reducing agent is transferred to the secondary water storage tank 32. By this operation, each weighing tank is emptied and prepared for the next cycle of weighing.

In the pan-type mixer 2, the inner kneading blades 12 rotate at a higher angular velocity than the outer kneading blades 14, so the materials to be kneaded in the center of the kneading tank rotate at a higher angular velocity than the materials to be kneaded on the outside. This will result in forced movement and efficient kneading. The required kneading time is 22 seconds from the start of material input.

After producing mortar by the above-mentioned kneading, the mortar is discharged from the pan-type mixer 2 and introduced into the biaxial forced mixing mixer 1 which is in operation. Here, the discharge of mortar from pan type mixer 2 is at gate 1.
This is done by opening 6 and 16a. gate 16,
To open 16a, use piston rods 20, 20a.
Lower the upper end of the packing 19 and the discharge port 15.
After forming a gap between the piston rods 18 and the edges of the piston rods 18, 18a, the piston rods 18, 18a are retracted.

As described above, when the gates 16, 16a are opened, the mortar in the pan-type mixer 2 quickly moves downward along the inclined wall 7a, so that it can be discharged in an extremely short time. The required discharge time is 10 seconds, which is 5 seconds shorter than the conventional example (Japanese Patent Publication No. 10886/1986, hereinafter the same). In parallel with discharging and charging mortar, gravel and secondary water (water-reduced mixture) are charged into the twin-screw forced mixing mixer 1. In this case, the time taken to add gravel was 9 seconds, which was 4 seconds shorter than in the conventional example.

Secondary kneading is performed while adding the materials in this manner. Since a sufficiently kneaded mortar is obtained by the first kneading, the purpose of the second kneading is to mix the gravel uniformly, and the kneading time is 22 seconds after the start of material introduction. , which is 3 seconds shorter than the conventional example. The desired concrete is manufactured by the above-mentioned secondary kneading. This concrete is discharged from gate 6. The gate 6 is provided along the shaft 4 and substantially along its entire length, so that concrete can be quickly discharged. The evacuation time is 10 seconds.

As shown in Fig. 4, this embodiment starts the second measurement of the material while the first primary kneading continues, and performs the second primary kneading while the second kneading continues. Therefore, the time required for one cycle can be reduced to 32 seconds, which is a reduction of 8 seconds compared to the conventional example.

(Effects of the Invention) According to the present invention, the first kneading to obtain mortar is performed by a pan-type mixer with high kneading capacity and a fast discharge speed, and the second kneading is performed by a twin-screw forced mixing mixer with a fast discharge speed. , the total kneading time and total discharge time can be shortened. Moreover, by opening the horizontal sliding gate to discharge mortar from the pan-type mixer, the time required to open the gate is reduced, and the discharge time can be further shortened.

In this invention, since the mortar can be efficiently kneaded using the pan-type mixer, the kneading time using the twin-screw forced mixer can be reduced as much as possible.

In other words, in a mixer for concrete production, the power of the driving motor shows a peak in the early stage after mixing is started in the material feeder, but this power peak is larger in a pan-type mixer than in a two-shaft mixer among mixers with the same capacity. . Especially when shortening the material input time, a two-shaft forced mixing mixer is advantageous because it can quickly disperse the material.
The difference in peak power for both mixers becomes even larger.

Therefore, in the present invention, which shortens the material input time, by disposing the two-shaft forced kneading mixer in the lower stage, safe operation can be achieved without increasing the horsepower of the driving motor. In addition, in a two-shaft forced mixing mixer where it is generally not possible to install a shock absorber for the mixing blades, the wear of the mixing blades has a large effect on the biting of gravel, so shortening the mixing time will reduce the wear of the mixing blades. That's reasonable.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the apparatus used for carrying out this invention, FIG. 2 is a side sectional view of the same, FIG.
The figure is a cycle time chart as well, and FIG. 5 is a cycle time chart in a conventional example. 1... Two-shaft forced kneading mixer, 2... Pan-type mixer, 3, 7... Kneading tank, 4, 8... Rotating shaft,
5, 12, 14...Kneading blade, 6, 16, 16a
...Gate, 19...Patzking.

Claims (1)

[Claims] 1 In a stacked mixer with a pan-type mixer installed in the upper stage and a biaxial forced mixing mixer installed in the lower stage, the lower part of the pan-type mixer is formed into a funnel shape, and a horizontal sliding gate is installed at the discharge port at the lower center of the mixer. A laminated type for concrete production, characterized in that the discharge port faces above the two-shaft forced mixing mixer, and the two-shaft forced mixing mixer has a long discharge port with a gate provided at the center of the lower part thereof in parallel with the rotating shaft. mixer.