Agitating – Mortar mixer type – With dynamic delivery
Patent
1981-02-04
1983-09-13
Coe, Philip R.
Agitating
Mortar mixer type
With dynamic delivery
366 57, 366228, B28C 520
Patent
active
044038658
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to mixing apparatus, such as concrete mixers, which have a rotatable drum with substantially horizontal axis of rotation and with one end, which is provided for the inut of the material that shall be mixed, and one end which is provided for the discharge of the mixed material, and with a shell, which supports a number of mixing wings, which have a screwlike arrangement. Thus, during the rotation of the drum in one direction, the mixing direction, they tend to convey the material in axial direction towards the input end and during the rotation in the opposite direction, the discharge direction, they will feed the material in axial direction towards the discharge end. The shell also supports additional mixing wings, of which each one is attached in such a position relative to one of the first mixing wings that the additional wing is below the belonging first wing, when this wing as a consequence of the rotation of the drum in the mixing direction is in an angular position, which means that the material carried along by the wing slides off the same, so that this material then hits the belonging outer wing, which has such a screw-form that because of its inclination it tends to convey the material in direction towards the discharge end. In this way, the material gets a double directed axial movement for one thing in a layer in the direction towards the input end by the action of the first wings, and for another thing in a layer in the direction towards the discharge end as a result of the action of the additional wings.
The invention especially relates to free-fall mixers with a horizontal mixing drum and discharge wings.
BACKGROUND
When mixing concrete, three principal ingredients shall be mixed: Cement, aggregate and water. In order to carry out this mixing operation, extensive use has been made of free-fall mixing machinery. A mixer of the type considered here has a horizontal mixing drum with two series of wings, viz. mixing wings and discharging wings. The drum is charged at one end, and the material then meets the mixing wings, which move the material in upwards direction and again lets it fall down, whereby the ingredients of the mass are mixed together. During this operation the wings are adjusted in such a way that the material is kept back at the input end of the drum. When the drum shall be emptied, its direction of rotation is reversed. The mixing wings then feed the material in a direction away from the input end towards the other end of the drum, when the material is discharged by means of the helicoidal setting of the discharge wings. Thus the horizontal position of the drum is maintained during the charging, mixing and emptying operations.
TECHNICAL PROBLEM
This type of mixer has turned out to produce an accceptable result, as long as the mixing operation only comprises the three principal ingredients. However, in modern concrete technology additional ingredients are used, their proportion relative to the total mix being very small. Carefully carried out experiments have proved that the type of mixer mentioned cannot produce a uniform distribution of said ingredients in the bulk of the mixture. By way of example ingredients can be mentioned, which are utilized in order to render the concrete pumpable. One such ingredient producing air bubbles has the trade name of Sika AER and shall be admixed in a quantity of the order of 0.5 kg per m.sup.3 of concrete mass, which illustrates the difficulties in obtaining a uniform distribution. If an ingredient of this kind is not admixed with a great uniformity in the mass, certain portions of the charge will get such poor pumping properties that a jamming of the pumps used for the transportation of the mass is risked. An improved mixture can be obtained by prolonging the time of the mixing operation, which, however, is not efficient and in addition results in that the deposits of hardened concrete in the mixer will increase.
It is an object of the present invention to provide a concrete mixer of the free-
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patent: 971051 (1910-09-01), Larkin, Jr.
patent: 1220683 (1917-03-01), Ransome
patent: 2305272 (1942-12-01), Petersen
patent: 2614819 (1952-10-01), Longenecker
patent: 2708570 (1955-05-01), Manabe
patent: 3552721 (1971-01-01), Phillips
patent: 3915439 (1975-10-01), Albin et al.
Coe Philip R.
Pitko Joseph M.
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