JPH0556234U - Kneading equipment - Google Patents

Abstract

(57) [Summary] [Purpose] When kneading a powdery material with a large change in bulk specific gravity and a liquid, a series of kneading processes can be automated without the need for manual balance weighing as a preliminary step. A device that can be thoroughly mixed is provided. A kneading device for mixing a powdery material and a liquid having a bulk specific gravity change rate of 20% or more, wherein a powdery material supply unit for supplying an appropriate amount of the powdery material to a measuring unit, and from the supply unit A weighing unit that weighs the supplied powdery substance, a computing unit that computes the amount of liquid to be kneaded based on the weight value weighed in the weighing unit by a predetermined computing equation, and the computing unit A kneading device including a liquid supply amount command unit for commanding the liquid supply unit to supply a liquid in an amount and a kneading unit for kneading the liquid supplied from the liquid supply unit and the powdery material of the measuring unit. .

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a kneading device, and provides a kneading device suitable for mixing and kneading a specific powder and a liquid.

[0002]

[Prior Art]

 Generally, a device for mixing powder and liquid and kneading them is known. For example, a dental alginate impression material is used by kneading a powder made of gypsum, sodium alginate, and a curing modifier with water, and a kneading device conventionally used to knead this powder with water. As for the setting, a certain weight of powder and water are put into a predetermined container, and then this container is shaken to mix the powder and water.

By the way, the powder composed of the above-mentioned gypsum, sodium alginate, and the hardening modifier has a high chemical activity, and therefore the powders tend to agglomerate slightly, and the bulk specific gravity changes greatly over time. And becomes non-uniform. Therefore, even if a certain volume of this powder is taken, the amount of water to be added is unknown because the weight of the powder varies widely. In addition, attempts have been made to form the above-mentioned powder into a granular or pellet shape, but it has not been possible to produce a powder whose bulk specific gravity does not change.

Therefore, it is difficult for a conventional kneading device to automatically weigh a constant weight. Therefore, a balance is prepared separately from the kneading device, and a predetermined weight of the powder is put in a predetermined container before kneading. It was necessary to manually weigh the body and water, which was troublesome and it was difficult to automate the series of kneading processes.

[0005]

[Problems to be solved by the device]

 In view of the above problems, the present invention is a series of kneading processes that does not require manual weighing and weighing as a preliminary step when mixing and kneading powder and liquid having large changes in bulk specific gravity. An object of the present invention is to provide a kneading device capable of automatically carrying out the desired kneading and efficiently carrying out a desired kneading.

[0006]

[Means for Solving the Problems]

 As a result of various studies to solve the above problems, in contrast to the conventional idea of weighing and kneading a certain weight of powder, an appropriate amount of powder is taken, and the weight is measured and kneaded. Based on this technical idea, the following kneading device was completed based on the new idea of calculating the amount of liquid to be added.

That is, the present invention is a kneading apparatus for mixing a powdery material and a liquid having a change rate of bulk specific gravity of 20% or more, and supplying an appropriate amount of the powdery material to a measuring unit. Part, a measuring part for measuring the weight of the powdery substance supplied from the supply part, an arithmetic part for calculating the amount of liquid to be kneaded based on the weight value measured by the measuring part by a predetermined arithmetic expression, A supply liquid amount commanding the liquid supply unit to supply the amount of liquid calculated in the calculation unit. A kneading unit kneading the liquid supplied from the liquid supply unit and the powdered material of the measuring unit. A kneading device for a predetermined powdery substance and a liquid, which is characterized in that it is configured.

Here, under the condition that the change rate of the bulk specific gravity is 20% or more, when there is a large change in the bulk specific gravity, for example, a certain volume of the powdery material is weighed and a predetermined amount of liquid is kneaded. However, since the quality of the kneaded product is not uniform in practical use due to the quality control, the kneading device of the present invention can be used to easily and efficiently use the boundary numerical values. is there. In particular, the present invention is particularly significant in the case of a powdery material having a change rate of bulk specific gravity of more than 20%, for example, 40% or more.

The bulk specific gravity is generally obtained by placing a certain volume of a powdery substance in a container, measuring the weight of the powdery substance, and dividing the weight by the volume. The ratio of change in specific gravity is the bulk specific gravity of the powdery material deposited to a depth of 20 cm from the surface layer after being left to stand for 7 days after being agitated, relative to the bulk specific gravity A immediately after the powdery material is sufficiently stirred in the air. The ratio of the difference between B and the bulk specific gravity A, that is, 100 (B / A-1) is designated.

Further, such a powdery substance usually tends to have a large bulk specific gravity with time when left at atmospheric pressure. In particular, the powdery material in the lower part is compressed by the influence of the weight of the powdery material in the upper part, and has a property of increasing the bulk specific gravity.

Typical examples of the powdery substance to which the present invention is applied include, but are not limited to, gypsum, alginate, phosphate and their mixtures which are raw materials for dental impression materials. However, any powdery material having a bulk specific gravity change rate of 20% or more is targeted.

[0012]

【Example】

 FIG. 1 is a drawing schematically showing a typical embodiment of the present invention.

There are a powdery material supply unit 1 for supplying a powdery material having a bulk specific gravity change rate of 20% or more, and a liquid supply unit 2 for supplying a liquid to be kneaded with the powdery material.

An appropriate amount of the powdered material is sent to the powdery material weight measuring unit 3, and the weight thereof is measured.

It is preferable that the measurement is performed automatically, and examples of the mechanism include a pressure sensor, an automatic electronic balance utilizing magnetic change, and the like.

The measurement result is sent to the liquid amount calculation unit 4, which automatically determines the optimum amount of the liquid to be mixed with the liquid amount calculation unit based on the weight measurement value of the powdery substance using a computer or the like. Is calculated.

The calculation formula in the liquid amount calculation unit 4 is not particularly limited, but, for example, when the weight measurement value of the powdery substance is X and the liquid amount to be obtained is Y, Y is generally a function of X and Y = f ( X), but the function f (X) is usually a linear function of X in many cases. Specific values of the coefficient and the constant term of the first-order term are determined depending on the kind of powdery material and the desired viscosity of the kneaded product. For example, in the case of a mixed system of sodium alginate, gypsum dihydrate, silica, and trisodium phosphate, which is the raw material of the dental alginate impression material, the coefficient of the primary term should be in the range of 0.35 to 0.42. Good results are obtained. That is, by kneading with the liquid of the amount calculated by the arithmetic expression having the coefficient within this range, the amount of the powdery substance sent to the powdery substance weight measuring unit 3 and the change of the bulk specific gravity are not affected. A good impression material can be obtained in terms of viscosity, kneading feeling and elastic modulus of the kneaded product.

The constant term is usually desired to function for fine adjustment.

The optimum liquid amount signal calculated by the liquid amount calculation unit 4 is sent to the supply liquid amount command unit 5, and the liquid supply operation unit 7b is operated by the signal from the command unit 5 and calculated. The amount of the liquid is sent to the kneading section 6, while the powdered material is weighed from the powdery material weighing section 3 and is mixed with the powdery material that has been weighed first and then sent to the kneading section 6, and both are kneaded. Be done.

In FIG. 1, reference numeral 7a indicates a powdery material supply operation section, reference numeral 8a indicates a powdery material supply operation section operating motor, and reference numeral 8b indicates a liquid supply operation section operating motor. Generally, a hopper type container having a tapered bottom is preferably used as a container used for the powdery material supply unit 1 and the liquid supply unit 3, and a spiral feeder or a scraping type is usually used for transferring the powdery material. Stuff is adopted.

In addition, since the liquid generally shows almost no change in specific gravity under the conditions of use of the device of the present invention, by operating a tube pump or a piston pump for a predetermined time, it is possible to obtain a desired calculation result. The amount of liquid to be used can be easily sent to the kneading section.

Next, specific examples and comparative examples performed using the kneading device of the embodiment shown in FIG. 1 will be shown.

Example A powdery material having the composition shown in Table 1 was prepared and charged in the powdery material supply unit 1. On the other hand, water was charged in the liquid supply section 2.

Next, the motor 8a for operating the powdery material supply operation unit was started for 5 seconds, and the powdery material was transferred to the powdery material weight measuring unit 3. The weight of the powdered material was measured, and the measurement result was sent to the liquid amount calculation unit 4, and the calculation unit calculated the optimum amount of the liquid to be kneaded based on the weighted value of the powdered material. Here, the relationship between the weight measurement value of the powdery substance (denoted by X) and the amount of liquid to be kneaded (denoted by Y) was Y = 0.385X.

Further, the liquid amount signal calculated by the liquid amount calculation unit 4 is sent to the supply liquid amount command unit 5, and the liquid supply operation unit 7b is operated by the signal of the command unit to calculate the calculated amount. Water was sent to the kneading section 6. At this time, the starting time of the motor 8b for operating the liquid supply operation part was 4.5 seconds.

After that, the weighted powdery material was transferred to the kneading section 6 with the bottom of the container of the weighting section 3 opened.

Next, a lid was attached to the kneading section 6, and the kneading was performed by vibrating for 30 seconds.

After the kneading, the lid was opened and the kneaded product was taken out from the kneading section 6. This kneaded product had good quality for taking an impression in the oral cavity. That is, the viscosity was 700 poise and the elastic modulus was 12%, and a sufficient pressure contact feeling was obtained.

Comparative Example Without passing through the powdery material weight measuring unit 3, the powdery material supplying operation unit operating motor 8 was started for 5 seconds to directly transfer the powdery material from the powdery material supplying unit 1 to the kneading unit 6. The same powder was transferred. Next, the liquid supply operation motor 8b was activated for 4.5 seconds to supply water to the kneading section 6. Then, a lid was attached to the kneading part, and the mixture was vibrated for 30 seconds for kneading. After the kneading was completed, the kneaded product was taken out and its physical properties were examined. It had a viscosity of 50 poise and an elastic modulus of 25%, and was not suitable for making impressions because it easily flows.

[0030]

[Table 1]

[0031]

[Operation effect]

 As described above, the kneading device of the present invention takes an appropriate amount of the powdery substance and weighs it, in contrast to the conventional idea of weighing and kneading the powdery substance of a constant weight. This is based on the new idea of calculating the amount of liquid to be mixed.

Therefore, not only is it necessary to weigh out a predetermined weight in advance, but even a powdery substance whose bulk specific gravity fluctuates greatly is not affected by the change in bulk specific gravity, and the amount can be arbitrarily adjusted. It has the advantage that an optimum amount of liquid can be kneaded according to the weight of the powdery material.

Further, by arbitrarily selecting the calculation formula of the liquid amount, the viscosity and the like of the obtained kneaded product can be appropriately changed, and the quality control is easy.

Further, there is an advantage that a conventional manual weighing step before kneading is omitted, and a series of kneading processes can be easily automated.

[Brief description of drawings]

FIG. 1 is a drawing schematically showing a typical embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 powdered material supply part 2 liquid supply part 3 powdered material weight measurement part 4 liquid amount calculation part 5 supply liquid amount command part 6 kneading part 7a powdered material supply operation part 7b liquid supply operation part 8a powdery material supply operation Section operation motor 8b Liquid supply operation section operation motor

Claims (1)

[Scope of utility model registration request] 1. A kneading device for mixing a powdery material and a liquid having a change rate of bulk specific gravity of 20% or more, wherein a powdery material supplying section for supplying an appropriate amount of the powdery material to a measuring section, the supply. Measuring unit for measuring the weight of the powdered material supplied from the measuring unit, a calculating unit for calculating the amount of liquid to be kneaded based on the weight value measured by the measuring unit by a predetermined calculation formula, the calculating unit And a kneading section for kneading the liquid supplied from the liquid supply section and the powdered material of the measuring section. A kneading device for mixing a predetermined powdery material with a liquid.