Agitating – Mortar mixer type – Movable stirrer
Patent
1987-05-26
1988-07-19
Hornsby, Harvey C.
Agitating
Mortar mixer type
Movable stirrer
366128, 366194, 366300, 222200, B01F 704, B01F 1100
Patent
active
047580950
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a dual shaft pan mixer which is preferred for use in mixing concrete material, while not limited thereto, and more particularly, to a dual shaft pan mixer having a pair of paddle assemblies which are disposed horizontally and in parallel relationship with each other within a mixing vessel and rotating in opposite directions.
DESCRIPTION OF THE PRIOR ART
A dual shaft pan mixer can be used for mixing a relatively large volume of mixture, and finds extensive application in concrete mixer. Japanese Laid-Open patent application No. 48-30149 laid open on Apr. 20, 1973 (or counterpart German Application DE OS No. 2,141,908) discloses a typical dual shaft pan mixer which is currently used as a concrete mixer. A mixer of such type comprises a pair of paddle assemblies associated with a first and a second pan section having a cross-sectional configuration of a pair of hollow cylinders joined transversely to each other. The pair of paddle assemblies are disposed horizontally and in parallel relationship with each other, and rotate in opposite directions. Each of the paddle assemblies comprises a shaft which is rotatably mounted in its associated pan section and a plurality of paddles fixedly and rigidly mounted on the shaft. Each paddle includes an arm and a shovel, and is angularly offset 90.degree. with respect to adjacent paddles. The pair of paddle assemblies depict loci of rotation which partly overlap each other. The paddle assemblies are both accordingly driven synchronously either mechanically or electrically, whereby a mixture is driven reciprocately between one of the pan sections and the other.
Normally, a discharge port is defined below and intermediate the pair of pan sections of the mixing vessel, and a slide valve or shutter is mounted therein for opening or closing the port. Because of such construction of the discharge port, a region located intermediate the pair of pan sections creates a substantially triangular dead space. Such dead space has been believed according to the recognition of the prior art to be useful to guard the structure of the discharge port from abrasion which may result from a rapid movement of the mixture which is being mixed. However, the inventors have found that a temporary stagnation of the mixture in the dead space prevents an overall high mixing performance.
It is already known that the application of vibrations to the mixture which is being mixed contributes to improving the mixing performance, and U.S. Pat. No. 4,148,588 issued Apr. 10, 1979 to the present inventors and entitled "Pan mixer" discloses a rotating pan mixer in which longitudinal vibrations are applied to a fixed paddle assembly which is disposed within the rotating pan.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a dual shaft pan mixer having improved fluidity of mixture and mixing performance and which is capable of achieving a uniform mixing within a reduced length of time.
It is a specific object of the invention to provide a dual shaft pan mixer including a vibrator which applies vibrations to the mixture which is being mixed.
In accordance with the invention, there is provided a dual shaft pan mixer comprising a mixing vessel including a first and a second pan section, a pair of paddle assemblies disposed horizontally and in parallel relationship with each other within the mixing vessel so as to be associated with each of the pan sections and having drive shafts which are driven for rotation in opposite directions, and a drive source for synchronously driving the pair of paddle assemblies. The mixing vessel includes a substantially triangular space intermediate and below the first and the second pan section and located out of the loci of rotation of the pair of paddle assemblies. It includes a discharge port disposed adjacent to the space. The dual shaft pan mixer of the invention additionally includes rod-shaped vibrator means disposed within the space and extending in a direction parallel to the drive shafts. The rod-shap
REFERENCES:
patent: 2178881 (1939-11-01), Roeth
patent: 3271012 (1966-09-01), Van Bael
patent: 3370758 (1968-02-01), Bodine
patent: 4148588 (1979-04-01), Kanda et al.
patent: 4411560 (1983-10-01), McComb
patent: 4572674 (1986-02-01), Mathis et al.
Kanda Mamoru
Numagami Kathuichi
Udagawa Teruo
Adams Bruce L.
Chichibu Cement Kabushiki Kaisha
Chichibu Engineering Kabushiki Kaisha
Gerrity S.
Hornsby Harvey C.
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