JPS6159167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bidirectional counterflow kneading type continuous mixer for continuously kneading and manufacturing mortar, cement concrete, composite materials containing cement, etc. used in various construction works or product manufacturing.

Conventional equipment for kneading mortar, cement milk, cement concrete, etc. includes a tilting-body rotating type mixer, a mixer with stirring blades in a pan, and a mixer that mixes by placing the kneaded material in a bag and moving it up and down. There are omni-type mixers.
However, since all of these devices measure and knead each batch, operations such as material supply, measurement, kneading, and discharge are repeated. As a result,
It was difficult to continuously knead a large amount, and the efficiency was very low.

Moreover, since concrete materials are made by kneading material components with different densities, specific gravity, dimensions, shapes, etc., it is necessary to thoroughly knead and disperse each material homogeneously, but a batch mixer cannot There were times when I was not always satisfied.

For example, a screw-type kneading device has been considered as a device to solve these problems, but with only a single screw, the residence time of the kneaded material is short.
Kneading was also not sufficient, and it was not possible to sufficiently knead aggregates with relatively large particle sizes or materials with very small particle sizes.

In addition, there are continuous mixers that combine screws and paddles, and although they can exhibit kneading performance that surpasses batch mixers, they are wasteful in terms of volumetric efficiency; In order to bring out the best in this process, there are many difficulties such as lowering the kneading capacity, increasing the mixer capacity, and performing multi-stage kneading.

Therefore, this invention solves this problem by using convection kneading from both directions, pushing up the kneaded materials against the conventional gravity, forcefully stirring, and exerting an omni effect with a flexible mixer bottom. This is an addition to the continuous mixer that continuously kneads materials while improving volumetric efficiency and convection between materials to improve kneading efficiency.
The object of the present invention is to provide a continuous mixer of bidirectional counterflow kneading type that enables improvement in kneading efficiency of materials having different specific gravities.

Therefore, the present invention provides two rotating shafts that extend parallel to the gutter and are arranged in parallel in the gutter, screw teeth and paddle groups of each of the rotating shafts are arranged alternately in the longitudinal direction,
In the bidirectional counterflow kneading type continuous mixer, in which the screw teeth of each rotating shaft and a part of the paddle group are provided so as to protrude into the kneaded material transfer area around the other rotating shaft as the rotating shaft rotates, the bottom center of the gutter is provided. By providing a small protrusion extending in the longitudinal direction and forming two grooves extending in parallel in the longitudinal direction at the bottom of the gutter, the cross section of the gutter is formed into a W-shape, and each of the rotating shafts is arranged along each groove,
The paddle group of the one rotating shaft and the screw teeth of the other rotating shaft are provided at corresponding positions, and the gutter is inclined upward from the material supply end side to the material discharge end side. By using a counter-current kneading type continuous mixer, the residence time of the kneaded materials in the kneading device can be extended due to the omni effect compared to the conventional single screw type mixer, and kneading can be performed from both directions. The mixing efficiency can be improved. In addition, sufficient effects can be exhibited in kneading materials with different specific gravity or with very heavy specific gravity.

In addition, since the volumetric efficiency of kneading increases, the mixer capacity of the kneading material can be increased, and materials with very small particle sizes can be kneaded, and conversely, materials with large particle sizes such as aggregates can be kneaded. It has the following characteristics: it can mix materials with large differences in specific gravity, it can mix low slump concrete and heavy concrete, and it can thoroughly mix powder and liquid.

Next, the present invention will be explained based on the drawings.

In FIG. 1, a cement level control device 36 attached to the cement bin 29 detects when the cement supplied to the cement bin 29 reaches a predetermined height and operates to supply cement to the cement (not shown). Although it is designed to stop the supply device, it may also be a simple level detection means. Further, cement can be directly poured into the cement bin 29 from a bag, container, or the like.

An automatic cement metering and continuous feeding device 37 collects cement into a rotary vane feeder 32 (see FIG. 2) by means of a transfer screw 30 at the bottom of the tank.
The rotary vane feeder 32 can be rotated at a constant rotation speed or at an arbitrary rotation speed. Moreover,
Although one rotary vane feeder 32 is used in this apparatus, it may be provided in plurality depending on the blending amount.

The water supply device 35 includes a level switch 10 and a water pump 9 for automatically replenishing water.

The water amount selection device 12 controls the water supplied to a continuous mixing device for mortar, concrete, etc., and controls the water flow meter 15, adjustment valve 14, automatic opening/closing valve 13, and supplies a predetermined amount of water to a pug mill type mixer, that is, a two-way mixer. Countercurrent kneading type continuous mixer 44
supply to. The water flow rate adjustment valve 14 is used to set the mixture, and the amount of water to be supplied is determined by the setting.

A quantitative supply device 31 for kneading materials such as sand and aggregate is a device used for kneading materials other than milk such as mortar and concrete, and by adjusting the belt speed of the belt feeder 52 and the cut gate 41, the sand bin 31a, stones, bones, etc. shown in FIG. The supply amount of sand, stone, and aggregate to be discharged from the material bin 31b is determined.

The bidirectional counterflow kneading type continuous mixer 44 simultaneously and continuously kneads cement, other powder, water, or sand that is continuously supplied from each device based on a predetermined composition. This bidirectional counterflow kneading type continuous mixer 44 has a gutter 40 which is flexible and whose bottom side cross section is formed into a substantially W-shape as shown in FIG.
It is equipped with A small protrusion 40a extending in the longitudinal direction is formed at the center of the bottom of the gutter 40, and this small protrusion 40a forms two grooves 40b and 40c extending parallel to the longitudinal direction at the bottom of the gutter 40. There is. As a result, the gutter 40 has a W-shaped cross section. This gutter 40 is integrally molded from a flexible material and has a substantially W-shaped cross section, and a member having a cross-sectional shape is disposed within the gutter body having a substantially U-shaped cross section, so that the gutter 40 has a substantially W-shaped cross section. It may also be W-shaped. In addition, the bidirectional countercurrent kneading type continuous mixer 44 has a gutter 40.
Two rotating shafts 39, 39' arranged in parallel inside the
(see Fig. 5), screw teeth 39a, 39a' for feeding the kneaded material protruding from each rotating shaft 39, 39' at a predetermined interval in the longitudinal direction, and screw teeth 39a, 39a' between the screw teeth 39a, 39a or 39a. ', 39a', stirring paddles 39b, 39b' protruding from the circumferential surface of each rotating shaft 39, 39', and each rotating shaft 3
It has gears 39c, 39c' which are attached to the ends of the shafts 9, 39' and mesh with each other, and a motor 38 which is interlocked with the rotating shaft 39. Moreover, screw tooth 3
9a corresponds to the paddle 39b', and the screw tooth 39
a' corresponds to the paddle 39b, and the screw teeth 39a of the rotating shaft 39 and the paddle 39b protrude into the kneaded material conveying area around the other rotating shaft 39', and the screw teeth 39a' of the rotating shaft 39' and the paddle 39b' projects into the kneaded material conveying area around the other rotating shaft 39. In addition, the rotating shafts 39, 39'
are located close to each other and the groove 40b of the gutter 40,
The grooves 40b and 40c are arranged on the grooves 40b and 40c. Moreover, the gutter 40 is slightly inclined upward from the material supply end side to the material discharge end side. Further, the gutter 40 may have the same inner diameter over its entire length, or may have a shape that is slightly narrower on the discharge side.

In such a bidirectional counterflow kneading type continuous kneading mixer 44, when the motor 38 is operated,
The rotating shafts 39, 39' rotate in opposite directions, and the kneaded material in the gutter 40 is mixed with the screw teeth 39a, 39'.
While being transferred upward by 39a, this kneaded material is kneaded by paddles 39b and 39b'. Moreover, the paddle 39b protrudes into the kneaded material transfer area of the screw teeth 39a' of the rotating shaft 39' to stir and knead the kneaded material, and the paddle 39b' protrudes into the kneaded material transfer area of the screw teeth 39a of the rotating shaft 39. By stirring and kneading the kneaded material, counterflows of the kneaded material from both directions are kneaded.

At this time, each paddle 39b, 39b' is placed in the kneaded material transfer area of the screw teeth 39a', 39a.
A part of the kneaded material on the sides 9b, 39b' is moved, and this moved kneaded material is transferred to the screw teeth 39a', 39b'.
It is transported upward by 9a. On the other hand, paddle 39
b, 39b' move into the kneaded material transfer area of the screw teeth 39a', 39a, the kneaded material in the kneaded material transfer area is scraped out toward the paddles 39b, 39b', respectively, and the scraped kneaded material is Paddle 39b, 3
It is stirred and kneaded with the kneaded material around 9b'.

Further, in addition to the fact that the gutter 40 is slightly inclined upward, the paddles 39b and 39b' are arranged on the screw teeth 3.
9a and 39a or between 39a' and 39a', and the paddles 39b and 39b' correspond to the screw teeth 39a' and 39a, respectively, so that each screw tooth 39a' and 39a
The kneaded material scraped out by the paddles 39b, 39b' from within the kneaded material transfer area is transferred to the paddles 39b, 39.
b' is stirred and kneaded with the surrounding kneaded material, and at this time, the kneaded material is moved downward, ie, to the material supply side, while being kneaded by the action of gravity as the paddles 39b, 39b' rotate. Then, this kneaded material is again transferred to the screw teeth 39 by the paddles 39b and 39b'.
The kneaded material transfer areas a' and 39a are moved and transferred upward. Due to this omni effect,
The time the kneaded material remains in each paddle 39b, 39b' becomes longer, and at the same time, the kneading efficiency improves due to the convection of the kneaded material from the conveyance passage around the rotating shafts 39, 39', and The volumetric efficiency is also improved, and as the case may be, the water contained in the kneaded material and the hydration stability of the cementitious material are improved, and the volumetric kneading capacity of the mixer body is improved.

Therefore, the kneaded material is thoroughly kneaded by each of the paddles 39b, 39b', and this kneading becomes more homogeneous as it moves upwards in the gutter 40.

The control panel 11 has a built-in device for operating each device, a control device for setting the mixture, and a recording device for recording the amount of each material used and the amount of kneading.

As explained above, the present invention provides two rotating shafts extending parallel to the gutter and disposing them in parallel in the gutter, screw teeth of each of the rotating shafts and paddle groups being alternately provided in the longitudinal direction, and In a bidirectional counterflow kneading type continuous mixer in which screw teeth of a rotary shaft and a part of a group of paddles are provided so as to protrude into a kneaded material transfer area around the other rotary shaft as the rotary shaft rotates, a longitudinal groove is provided at the center of the bottom of the gutter. forming a W-shaped cross section of the gutter by providing a small protrusion extending in the direction and forming two grooves extending parallel to the longitudinal direction at the bottom of the gutter;
Each of the rotating shafts is arranged along each groove, and the paddle group of one of the rotating shafts and the screw teeth of the other rotating shaft are provided at corresponding positions,
Since the gutter is inclined upwardly from the material supply end side to the material discharge end side, the bidirectional counterflow kneading type continuous mixer has the following effects.

Compared to the conventional single-screw type, the residence time of the kneaded materials in the kneading device can be extended due to the omni effect, and since kneading can be performed from both directions, the mixing efficiency can be improved. In addition, sufficient effects can be exhibited in kneading materials with different specific gravity or with very heavy specific gravity.

In addition, since the volumetric efficiency of kneading increases, the mixer capacity of the kneading material can be increased, and materials with very small particle sizes can be kneaded, and conversely, materials with large particle sizes such as aggregates can be kneaded. Can mix materials with large differences in specific gravity. Can mix low slump concrete and heavy concrete. Can sufficiently mix powder and liquid. Mortar with special admixture added, milk or The kneading effect of emulsion liquids containing oil-based substances can be improved.

[Brief explanation of the drawing]

Fig. 1 is a piping system diagram of a kneading apparatus showing an embodiment of the present invention, Fig. 2 is a side view of the kneading apparatus shown in Fig. 1, and Fig. 3 is a plan view of the kneading apparatus shown in Fig. 2. 4 is a cross-sectional view of a continuous mixer of bidirectional counterflow kneading type, and FIG. 5 is a layout diagram showing the relationship between screw teeth and paddles of the continuous mixer of bidirectional counterflow kneading type. 38...Motor, 39, 39'...Rotating shaft, 39
a, 39a'... Screw tooth, 39b, 39b'... Paddle, 39c, 39c'... Gear, 40... Gutter, 44...
Bidirectional counter-current kneading type continuous mixer.

Claims (1)

[Scope of Claims] 1. Two rotating shafts extending parallel to the gutter are arranged in parallel in the gutter, screw teeth and paddle groups of each of the rotating shafts are provided alternately in the longitudinal direction, and In a bidirectional counterflow kneading type continuous mixer in which screw teeth and a part of the paddle group are provided so as to protrude into the kneaded material transfer area around the other rotating shaft as the screw teeth rotate, the screw teeth and the paddle group extend longitudinally at the center of the bottom of the gutter. By providing a small protrusion and forming two grooves extending parallel to the longitudinal direction at the bottom of the gutter, the cross section of the gutter is formed into a W-shape, and each of the rotating shafts is aligned along each of the grooves. The paddles of the one rotating shaft and the screw teeth of the other rotating shaft are provided in corresponding positions, and the gutter is arranged from the material supply end side to the material discharge end side. A continuous mixer of bidirectional counterflow kneading type, characterized by an upwardly sloping mixer.