JPS6234951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a squeeze-type concrete pump that uses a roller body to press a pumping tube and a pumping effect to the tube to suck concrete into the tube and force-feed the sucked concrete. It is.

Conventionally, in this type of pump, as shown in FIG. 3, concrete 02 sucked into a tube 01 is squeezed out by the pressing action of rollers 03, 03.

Therefore, since the inner surface of the tube 01 is constantly in contact with the concrete 02, it wears out considerably, and especially the parts pressed by the rollers 03, 03 wear out even more.

Therefore, the tube 01 must be constantly replaced with a new one, which is uneconomical.

By the way, in order to eliminate the above problem as much as possible, the diameter d of the rollers 03, 03 should be increased so that the tube 01
By increasing the contact area between the rollers 03 and 03,
By gradually constricting the tube 01 and gradually restoring the tube 01, it is possible to eliminate even more severe wear at the portions of the tube 01 that are pressed by the rollers 03, 03.

However, if the diameter d of the rollers 03, 03 is increased, the diameter d of the rollers 03, 03 cannot be increased too much because it hits the rotating shaft 05 provided at the center of the pump case 04.

The present invention solves the above-mentioned problems by providing at least a pair of pressing units having a plurality of small diameter rollers at the free end of the rotary plate, and the plurality of rollers of the pressing unit are arranged close to each other. They are arranged in a substantially arc shape. The embodiment will be explained below with reference to the drawings. Reference numeral 1 denotes a sealed cylindrical pump case, and the center of this case 1 is provided with a rotating shaft 2 driven by a hydraulic motor (not shown). .

A rubber pad 3 is attached to the inner surface of the pump case 1, and a pumping tube 4 bent in a substantially U-shape is provided along the upper surface of the pad 3.
A rotor body 5 that presses the rotor body 5 is attached to the rotating shaft 2.

The rotor body 5 includes a circular rotating plate 6 fixed to the rotating shaft 2, a cylindrical ring 7 fixed to the outer peripheral end of the rotating plate 6, and a phase difference of 180 degrees on the outer circumference of the ring 7. It is comprised of a plurality of pressing units 8 for pressing the tube 4.

The pressing unit 8 includes a pair of crescent-shaped left and right roller support plates 9, 9, and a plurality of support shafts 10 provided at equal intervals on the circumferential edges of the roller support plates 9, 9.
10... and a plurality of small-diameter rollers 11, 11... which are supported by the support shafts 10, 10... and rotate.
The plurality of small diameter rollers 1
1, 11, . . . are arranged close to each other in a substantially arc shape. As a result, the substantially arcuate diameter D of the pressing unit 8 can be made large enough to interfere with the rotating shaft 2.

The operation of the present invention having the above-described structure will now be described. When concrete 12 is to be pumped, first, when the rotary shaft 2 is rotated clockwise by a hydraulic motor (not shown), the rotor body 5 is also rotated clockwise.

At this time, a plurality of small diameter rollers 11, 11, . . . provided in the pressing unit 8 press and roll on the tube 4. As a result, the concrete 12 is sucked in from below the tube 4, and the tube 4
It is discharged from above.

At this time, the plurality of small diameter rollers 11, 11
Since the tubes 8 are arranged close to each other in a substantially arc shape, the diameter D of the substantially arc shape is large, and the tube 8 can be gradually narrowed and gradually restored. This makes it possible to eliminate even more severe wear at the portions of the tube 4 that are pressed by the rollers 11, 11, . . . .

By the way, although the pressing unit 8 is welded onto the drum 7, it may be bolted. Further, the rotating plate 6 and the ring 7 may have other shapes as long as the same effect can be obtained.

As described above, according to the present invention, a pressing unit having a plurality of small-diameter rollers is provided at the free end of the rotating plate of the rotor body, and the plurality of small-diameter rollers of the pressing unit are arranged close to each other. By arranging the tubes in an arc shape, the diameter D of the substantially arc-shaped tube pressing surface can be increased, and the tubes can be gradually squeezed and gradually restored. It is possible to eliminate even more significant wear of the parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a concrete pump of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view showing a conventional concrete pump. 1 is the pump case, 4 is the pumping tube,
5 is a rotor body, 6 is a rotating plate, 8 is a pressing unit, and 11 is a roller.

Claims (1)

[Claims] 1. A pumping tube installed along the inner wall of a cylindrical pump case is given a pumping action by the pressing action of the rotor body and the restoring action of the tube itself to suck concrete into the tube and pump the sucked concrete. In the squeeze type concrete pump, the rotor body is composed of a rotating plate and at least a pair of pressing units provided at the free end of the rotating plate and having a plurality of small diameter rollers, A squeezing type concrete pump in which a plurality of rollers are arranged close to each other in a substantially arc shape.