JPS6220004B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention was developed in the process of research into how to increase the mixing capacity per unit time in production plants that manufacture mortar, ready-mixed concrete, etc., and how to improve the mixing effect and make quality products. It is characterized by the provision of a pre-kneading mixer for pre-kneading the kneaded materials in advance and preliminary kneading, which is rough kneading. It is equipped with a main kneading mixer for carrying out the main kneading, which is full-scale, precise kneading, and is further provided with separate power sources for the pre-kneading mixer and the main kneading mixer. It is in.

As shown in Fig. 1, the conventional kneading material input system includes a plurality of storage tanks 1 for storing each kneading material such as mortar and ready-mixed concrete, and a measuring tank 2 for weighing each of these materials. A collection chute 3 for collecting the materials discharged from the measuring tank was arranged below this measuring tank, and one mixer 4 for kneading the materials discharged from the chute was arranged below this chute. . Alternatively, two such mixers 4 may be installed in parallel, and a distribution chute (not shown) may be provided between the mixers 4 and the collection chute 3, and the kneaded materials may be distributed and introduced into one of the mixers while being alternately kneaded. This increased the overall mixing capacity.

However, the drawback of the above system is that all of the material is instantly dropped from the weighing tank 2 through the collection chute 3 into the mixer 4, and due to the structural limitations of the mixer and the motor output, All of the materials up to the upper layer cannot be completely absorbed into the stirring zone, and only a portion of the materials in the lower layer are mixed in advance, resulting in uneven kneading of these materials. Particularly in the case of mortar for broken concrete, it is extremely important to control the fluidity of the poured mortar, and pouring mortar in an unevenly mixed state is not allowed. In order to avoid this kind of situation, it is necessary to slow down the falling speed of the materials and mix them thoroughly.For this reason, a round steel damper was placed in the collection chute to slow down the falling speed of the materials, but this was the cause. Then the chute becomes clogged.
It became necessary to use a stick to poke through the window of the chute to help the material fall.

The present invention eliminates such inconvenience by providing the pre-kneading mixer 8 in series upstream of the main-kneading mixer 13, as well as making the material kneaded uniformly and reducing the power burden of the mixer. To reduce the total kneading energy consumed until the kneading is completed by reducing the amount of kneading, and to easily obtain an energy-saving mixer type plant.

An embodiment of the present invention will be described below based on the drawings. In FIG. 2, 5, 5, 5, . . . are storage tanks for storing each kneaded material such as mortar and fresh concrete. 6, 6, 6, . . . are measuring tanks for measuring each material stored in the storage tank. 7, 7, 7, . . . are chute for guiding the material discharged from the measuring tank to the pre-kneading mixer 8 which is arranged next. The pre-kneading mixer 8 is
This is a mixer for preliminary kneading, which roughly kneads the ingredients in advance. Reference numeral 13 denotes a main kneading mixer disposed below the pre-kneading mixer, and is a mixer for main kneading which precisely kneads the pre-kneaded materials in earnest.

In the plant of this embodiment configured as described above, the material that has been pre-kneaded in advance in the pre-kneading mixer 8 is further precisely kneaded in the main-kneading mixer 13, so that Of course, it is possible to knead to a more uniform strength than conventional ones.

Next, a plant for manufacturing mortar will be specifically explained.

In FIG. 2, the three storage tanks 5, 5, 5 are respectively a sand storage tank, a cement storage tank, and a water storage tank, and in relation to each storage tank, there are measuring tanks 6, 6, 6.
and chute 7, 7, 7 are provided. Preliminary kneading of the mortar is carried out in advance by weighing appropriate amounts of each material and sequentially supplying them to the pre-kneading mixer 8.

After that, this semi-mortar is mixed with main mixing mixer 1.
Following step 3, the main kneading process, which is full-scale kneading, is carried out afterwards, producing extremely high-quality, uniform mortar.

In a plant for producing ready-mixed concrete, three storage tanks 5, 5, 5 are respectively a sand storage tank and a sand storage tank.
It becomes a storage tank for cement and a storage tank for water.
A new gravel storage tank (not shown) will be added. Then, after the mortar is mixed in advance or the fresh concrete is preliminarily mixed in the preliminary mixer 8, the full-scale mixing of the fresh concrete is carried out later again in the main mixer 13. In this way, true ready-mixed concrete with excellent strength and uniformity is produced.

Although not shown in the drawings, in actual construction, mortar is temporarily stocked by providing an agitator in conjunction with the main mixing mixer 13, and ready-mixed concrete is stocked via a mortar pump or to the agitator. In some cases, the concrete is supplied to the respective predetermined pouring locations via a concrete pump.

Here, mortar or mortar for broken concrete refers to cement, sand (fine aggregate),
Ready-mixed concrete or ready-mixed concrete is a general term for anything containing mixed materials such as water, and ready-mixed concrete or ready-mixed concrete is a general term for materials containing mixed materials such as cement, sand (fine aggregate), gravel (coarse aggregate), and water. For mortar and ready-mixed concrete
You can freely add AE agents and other appropriate AD agents, and use lightweight aggregates instead of sand and gravel as aggregates.
You are also free to use others.

Next, we will discuss the advantages of adding a pre-kneading mixer when manufacturing mortar.

As a general tendency, when kneading materials such as sand, cement, water, etc. are fed into a mortar mixer to produce mortar, an extremely large resistance force acts on the kneading blades at the initial stage of kneading. This resistance tends to decrease as the degree of kneading of these materials progresses. Therefore, the motor of a conventional mortar mixer requires an extremely large amount of power when starting up and kneading, so a large capacity motor with a large starting torque must be used, which inevitably results in wasted motor capacity in the later stages of mixing. It becomes a stimulant like driving while using it. Furthermore, the resistance force acting on the kneading blades of the mixer fluctuates greatly, which may cause breakage or malfunction of the kneading blades. In the plant of the present invention, mortar that has been pre-mixed in advance in a pre-kneading mixer is supplied to a main-kneading mixer, which is then followed by main-kneading, and the optimal circumferential speed of the mixing blades is adjusted separately. Since a separate power source is used to achieve this, the resistance to the kneading blades is naturally small.
Therefore, the power fluctuation of the motor is small, the motor capacity is also small, there is no damage or failure of kneading blades, etc., and the optimum energy can be given to the kneaded material depending on the preliminary kneading or main kneading. Therefore, it is possible to improve the kneading effect and obtain mortar of good quality.

The above advantages also apply to ready-mixed concrete. Another advantage of the present invention is reduced kneading cycle time. This is because the pre-kneading mixer performs pre-kneading in advance while the main-kneading mixer is in operation, and it is possible to achieve sufficient consistency in 1/3 to 1/2 the kneading time of conventional systems. is obtained. A further advantage is that the wet sand or cement, which is introduced in bulk, is crushed beforehand in a premixer.

Therefore, the present invention is an excellent plant that can produce products of good quality because it performs preliminary rough kneading beforehand and then performs full-scale precise kneading. This is an excellent technology that can be applied not only to fresh concrete but also to fresh concrete.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional plant, and FIG. 2 is a system diagram of a plant according to an embodiment of the present invention. 1, 5... Storage tank, 2, 6... Measuring tank, 7...
Shoot, 8... Preliminary mixer, 13... Main kneading mixer.

Claims (1)

[Claims] 1. A plurality of storage tanks for storing kneaded materials such as gravel, sand, cement, water, etc., a measuring device for measuring the kneaded materials supplied from the storage tanks, and a measuring device for measuring the kneaded materials measured by the measuring devices in advance. A pre-kneading mixer that performs preliminary rough kneading, and a main kneading mixer that is arranged in series after the pre-kneading mixer and follows the kneaded materials again to perform full-scale precise kneading. 1. An energy-saving mixer type plant comprising: a main kneading mixer comprising a power source different from that of a pre-kneading mixer and driven by the power source.