Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Utility Patent
1997-07-01
2001-01-02
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
C417S900000
Utility Patent
active
06168397
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a squeeze type pump, which transfers slurry such as freshly mixed concrete, and more particularly, to an elastic tube preferably used for a squeeze type pump having squeezing rollers, which squeeze the elastic tube to elastically deform the tube and transfer slurry via the elastic tube.
Prior art squeeze type pumps include an elastic tube, which is arranged in a U-shaped manner along the inner surface of a cylindrical drum. A pair of support arms are mounted on a drive shaft that is inserted through a center of the drum. The support arms are separated from each other by an angle of 180 degrees and rotated synchronously. A pair of squeezing rollers are supported at a distal portion of each support arm by means of a support shaft and a bearing. The rollers squeeze the elastic tube from each side of its outer surface to elastically deform the tube into a flat shape.
The pairs of squeezing rollers squeeze the elastic tube to move concrete that is in front of the rollers through the tube along the revolving direction of the rollers. Furthermore, the succeeding pair of rollers revolve and squeeze the elastic tube to move concrete sealed within the tube, between the preceding rollers and the succeeding rollers, in the revolving direction of the rollers. Concrete is thus pumped.
However, in the prior art squeeze type pumps, which have an elastic tube that has a certain dimension, the elastic tube
61
is pressed against the inner surface of a drum
63
when the squeezing rollers
62
start to squeeze the tube
61
, as shown in
FIG. 14
by the solid line. This prevents the tube
61
from being located in a normal position, as shown in
FIG. 14
by the broken line. In such cases, it is necessary to replace the elastic tube or adjust the attachment position of the squeezing rollers. This reduces operation efficiency.
Furthermore, if these problems frequently occur, the elastic tube becomes worn in some locations, and the durability of the tube is reduced.
In addition, experiments show that the above problems occur with elastic tubes that have specific dimensions. As shown in Table 2, which will be described later, such elastic tubes have outer diameters ranging from 160 to 165 mm, inner diameters ranging from 120 to 145 mm, and thickness ranging from 7.5 to 22.5 mm. In such cases, the ratio of the inner diameter of the tube to the outer diameter thereof ranges from 0.73 to 0.91.
SUMMARY OF THE INVENTION
Accordingly, it is an objective of the present invention to provide a squeeze type pump having an elastic tube that is always located in a normal position between squeezing rollers when the rollers start to squeeze the elastic tube.
Furthermore, it is another objective of the present invention to provide an elastic tube used for a squeeze type pump capable of preventing local wear of the tube and improving the durability thereof.
A squeeze type pump according to the present invention transfers slurry via an elastic tube by squeezing the elastic tube with pairs of rollers to elastically deform the tube by moving each pair of squeezing rollers. The elastic tube includes an outer diameter, an inner diameter, and a thickness. A ratio of the inner diameter to the outer diameter is set within a range of 0.56 to 0.72, and the thickness is set within a range of 23 to 35 mm. It is assured that the elastic tube according to the present invention is thus squeezed while the tube is in the normal position. The local wear of the elastic tube is then prevented.
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patent: 4492538 (1985-01-01), Iwata
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patent: 4730933 (1988-03-01), Lohr
patent: 4730993 (1988-03-01), Iwata
patent: 5533878 (1996-07-01), Iwata
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Daiichi Techno Co., Ltd.
Freay Charles G.
Senterfitt Ackerman
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