JPH0549444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a continuous mixing device for concrete that continuously mixes and produces concrete.

[Conventional technology] As is well known, concrete is made of cement, water,
It is manufactured by kneading materials such as fine aggregate and coarse aggregate at the pouring site or at a ready-mixed concrete factory, and conventionally, batch-type equipment has generally been used as the kneading equipment used to mix the above materials. . This batch-type kneading apparatus measures each of the above-mentioned materials, puts them into a kneading drum, and after kneading them for a predetermined period of time, takes out the entire amount for use.

[Problems to be Solved by the Invention] However, the batch type device described above has the following problems. In other words, in batch-type equipment, especially when coarse aggregate with a large particle size is used, when fresh concrete flows out of the drum after mixing,
Due to the high mobility of coarse aggregate in concrete, coarse aggregate tends to increase in the early stage of spillage.
In some cases, uneven distribution (segregation) of coarse aggregate occurred in the fresh concrete that was taken out. Furthermore, when producing a large amount of concrete, large-scale equipment is required, and not only does such large-scale equipment require a lot of labor to move and install, but it also raises the cost of equipment, making it uneconomical. It was also disadvantageous. Furthermore, at sites where large amounts of concrete are used, batch-type equipment requires the use of multiple devices and operations must be performed piecemeal for each device, making the work plan complicated. .

The present invention was made in view of the above circumstances, and
Materials can be mixed homogeneously and taken out in a homogeneous state, improving production efficiency compared to batch-type equipment, and making it possible to produce large quantities of concrete with a small equipment. The purpose of this invention is to provide a continuous mixing device for concrete that can easily carry out planned work even when using concrete.

[Means for Solving the Problems] The present invention includes a mortar kneading section that kneads water, cement, and fine aggregate to produce mortar, and a mortar kneading section that kneads the mortar and aggregate produced in the mortar kneading section. and a concrete mixing section for manufacturing concrete, and the mortar mixing section is provided with a raw material input section at one end of the mortar mixing drum and a mortar delivery section at the other end, and the mortar mixing section is provided with a mortar delivery section at the other end. A stirring blade is rotatably provided to knead the raw material introduced from the raw material input part and send it to the mortar delivery part, and in the concrete mixing part, a concrete mixing drum is rotatably supported. An aggregate input unit for inputting aggregate from a direction opposite to the mortar feeding direction is provided on the side of the concrete mixing drum opposite to the mortar mixing drum into which the mortar delivery unit of the mortar mixing drum is inserted. A concrete delivery section is provided at the side end of the mortar mixing drum, and a concrete stirring member is fixed inside the concrete mixing drum for kneading mortar and aggregate and sending them toward the concrete delivery section.

[Function] Therefore, in the present invention, the mortar raw materials put into the mortar mixing drum are sent to the mortar delivery section while being stirred and mixed, and introduced into the concrete mixing drum from the mortar delivery section, and the mortar is sent by the concrete mixing drum. The mortar is stirred and mixed with the aggregate introduced from the opposite direction, and is fed in the opposite direction to the mortar injection direction to form concrete, which is then discharged to the outside from the concrete delivery section.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

The continuous mixing device shown in the figure is composed of a mortar mixing section and a concrete mixing section. In the figure, 1 is a cylindrical drum in the mortar mixing section, 2 is a cylindrical drum in the concrete mixing section, and the drum 1 is inserted halfway into the drum 2.

The drum 1 is provided with a raw material input section 3 for charging mortar raw materials such as water, cement, and fine aggregate at the upper side of one end (the left end in the figure), and at the other end (the right end in the figure). part) is opened to form a concrete delivery part for delivering concrete. Further, the side end of the drum 1 on the raw material input section 3 side is closed with a plate-shaped lid 4, and a cylindrical bearing is provided in the center of the lid 4 and protrudes outward through the lid 4. A member 5 is fixed with its axis aligned with the central axis of the drum 1. A rotary shaft 6, one end of which is rotatably supported by a bearing member 5, is arranged along the central axis of the drum 1. The end of the rotating shaft 6 on the bearing member 5 side is connected to the bearing member 5.
The sprocket wheel 7 is fixed to the projecting end. This sprocket wheel 7 is driven by a drive device such as a motor (not shown) via a chain, gears, etc.

Further, a plow-like stirring blade 8 for kneading mortar is provided on the portion of the rotating shaft 6 located inside the drum 1.
is fixed. Each stirring blade 8 is formed by fixing a plow part 8b formed by bending a metal plate to the tip of an arm 8a that projects radially outward with respect to the rotating shaft 6. The reason why a plow-shaped stirring blade 8 was adopted is because mortar is sticky, and a plow-shaped blade with a strong shearing action is effective for kneading, and also because the mortar does not adhere to the inner surface of the drum 1. This is because it has a property of being easy to adhere to, so a shape that is easy to adhere to is preferable. The inclination of these stirring blades 8 is determined so that the mortar can be sent from the drum 1 toward the drum 2 of the concrete mixing section as the stirring blades 8 rotate.

The drum 2 has a plurality of rollers 9 on its outer peripheral surface.
An annular gear 10 is rotatably supported by and fixed to the outer peripheral surface, and a gear 11 driven by a drive device (not shown) is meshed with the gear 10.

On the inner surface of the drum 2, there is a ribbon 12 formed of a strip-shaped metal plate spirally formed as a concrete stirring member.
are fixed thereto, and a plurality of annular baffle plates 13 are fixed at appropriate intervals. The inclination of the ribbon 12 is such that as the drum 2 rotates, concrete can be sent within the drum 2 to a concrete delivery section 14 at the left end of the drum 2.

The diameter of the opposite end of the concrete delivery portion 14 of the drum 2 is gradually reduced toward the right side in the figure, and an aggregate charging chute 15 for charging coarse aggregate into the drum 2 is provided at the reduced diameter portion. It is being The reason why the drum 2 is provided with a reduced diameter portion is to prevent the contents inside the drum 2 from spilling to the outside.

In the above-mentioned continuous kneading device, the rotary shaft 6 and drum 2 are rotated at a predetermined rotational speed by a drive device (not shown), and mortar raw materials such as cement, water, and fine aggregate are measured from the raw material input section 3 and continuously mixed. At the same time, coarse aggregate is metered and continuously introduced from the aggregate input chute 15 to continuously produce concrete.

That is, in the drum 1, the raw material introduced into the drum 1 from the raw material input part 3 is kneaded by the rotation of the stirring blade 8, and the mortar is gradually moved to the right side in the figure. When kneading this mortar, the particle size distribution range of the materials to be kneaded is smaller than when kneading with a batch-type concrete mixer (in other words, the particle sizes are relatively uniform), so the mixing efficiency is high and the material is homogeneous. Mortar can be easily obtained.

The mortar produced in drum 1 is stirred by stirring blade 8.
is sent through the drum 1 to the drum 2 side and discharged from the end into the drum 2. In the drum 2, coarse aggregate (or fine aggregate if necessary) is added to the mortar at a predetermined ratio. ) may be added. In the drum 2, the mortar and coarse aggregate are rolled and stirred by the rotation of the ribbon 12 while the drum 2 is being rotated, and in the process, the surface of the coarse aggregate is coated with mortar, producing high-quality ready-mixed concrete. ,
The concrete is sent toward the concrete delivery section 14. In addition, since the direction in which mortar is introduced into the drum 2 and the direction in which coarse aggregate is introduced into the drum 2 are opposite to each other, the mortar and coarse aggregate are mixed well, and the baffle plate 13 of the drum 2 serves as a concrete delivery section for the coarse aggregate. Since movement to the 14 side is prevented, there are fewer shoot paths for coarse aggregate. Furthermore, in mixing concrete, the coarse aggregate is introduced in the presence of mortar, so the impact that the coarse aggregate gives to the ribbon 12 during mixing is buffered by the mortar. Therefore, according to the above-described continuous kneading device, the ribbon 12 and the like are protected from wear caused by the coarse aggregate, reducing damage to the device, which in turn reduces maintenance effort and lengthens the life of the device. Furthermore, in drum 2, it is sufficient to mix coarse aggregate into the mortar made in drum 1, so mixing efficiency is high, productivity is high, and homogeneous, high-quality concrete can be manufactured. . In addition, during concrete mixing, the baffle plate 13 acts to increase the mixing efficiency of the coarse aggregate and mortar by blocking the movement of the coarse aggregate, which is guided by the ribbon 12 and tends to move, but it is not necessarily a necessary member. .

The concrete mixed and manufactured in the drum 2 is continuously delivered from the concrete delivery section 14 and sent to the site of use by a bucket, mixer car, belt conveyor, etc. as concrete transport means. In this device, the concrete is continuously delivered from the device at the same time as the mixing operation, so there is no segregation of coarse aggregate in the delivered ready-mixed concrete.

Therefore, according to the above-mentioned continuous mixing device, homogeneous concrete can be obtained continuously with good productivity, and furthermore, the maintenance effort of the device is reduced and the life of the device is extended, among other advantages. .

When only mortar is to be manufactured, only the mortar kneading section can be removed from the apparatus and placed in another predetermined position, and mortar can be manufactured.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effect of the invention] The continuous mixing device for concrete of the present invention has water,
A mortar mixing section that continuously supplies and kneads cement, fine aggregate, etc. to continuously produce mortar, and a mortar that is fed from this mortar mixing section and aggregates that are added to the mortar from a direction opposite to the direction in which the mortar is fed. In addition, it is equipped with a concrete mixing section that mixes and continuously produces concrete. (1) In the mortar mixing section, only mortar raw materials such as cement that do not contain coarse aggregate are kneaded and turned into mortar. (2) In the concrete mixing section, it is only necessary to mix aggregate to the homogenized mortar, so the mixing efficiency is good, and therefore it is possible to manufacture homogeneous concrete with high productivity. (3) The direction in which mortar is fed into the concrete mixing section and the direction in which aggregate is fed into the concrete mixing section are opposite, and the mixing of mortar and aggregate is (4) In the concrete mixing section, the aggregate is put in the presence of mortar, so during mixing, the impact of the aggregate on the stirring member etc. is buffered by the mortar, and the stirring by the aggregate is improved. Abrasion of parts is reduced, which in turn reduces maintenance effort and extends the lifespan of the equipment. Various excellent effects can be achieved, such as being able to obtain homogeneous concrete without segregation of concrete coarse aggregate.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view showing an embodiment of the present invention. In the figure, 1 and 2 are drums, 3 is a raw material input section, 8 is a stirring blade, 12 is a ribbon, 14 is a concrete delivery section, and 15 is an aggregate input chute.

Claims (1)

[Claims] 1. A mortar mixing section that mixes water, cement, and fine aggregate to produce mortar, and a concrete mixing section that mixes mortar and aggregate produced in the mortar mixing section to produce concrete. In the continuous mixing apparatus for concrete, the mortar mixing section includes a raw material input section at one end of the mortar kneading drum and a mortar delivery section at the other end, and the mortar kneading section includes a raw material input section and a mortar delivery section at the other end. A stirring blade is rotatably provided to knead the introduced raw materials and send them to a mortar delivery section, and a concrete mixing drum is rotatably supported in the concrete mixing section. An aggregate inputting section into which the mortar delivery section is inserted and which inputs aggregate from the direction opposite to the mortar feeding direction is provided on the side of the concrete mixing drum opposite to the mortar mixing drum, and the end of the concrete mixing drum on the mortar mixing drum side. Continuous mixing for concrete, characterized in that a concrete mixing drum is provided with a concrete delivery section, and a concrete stirring member is fixed to the inside of the concrete mixing drum to mix mortar and aggregate and send it toward the concrete delivery section. Device.