JPS6215757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a concrete tray in a screw pump.

Traditionally, before concrete hardens,
Usually, the concrete is scraped off while sliding a semicircular gauge whose diameter is a predetermined amount larger than the outer diameter of the screw to form an arc-shaped concrete tray.

By the way, in the case of screw pumps, even though the screw is quite long, it is only supported at both ends, so it inevitably bends naturally due to its own weight. In order to form a tray with a constant gap between it and the outer peripheral surface of the screw, it becomes necessary to slide the gauge along the deflection curve of the screw instead of simply sliding it in a straight line.

Therefore, conventionally, the deflection curve of the screw is assumed in advance, and the gauge is slid based on this assumed curve.

However, since it is extremely difficult to accurately determine the actual deflection curve of the screw in advance, in reality, the gap between the outer circumferential surface of the screw and the tray may be too large or too small than necessary. As a result, if the screw came into contact with the tray, there was a risk that problems such as irritation would occur.

The present invention has been made in view of the above-mentioned circumstances, and is a method for forming a concrete tray in a screw pump that can easily form a tray that can create a certain appropriate gap between the screw pump and the outer peripheral surface of the screw. I will provide a.

The method for forming a concrete tray of the present invention that solves this problem is to solidify the concrete tray by rotating the screw itself while sequentially holding the bearings at both ends of the screw in a plurality of eccentric positions that are offset by a certain amount from the normal holding position. The gist of the present invention is to scrape off the tray forming portion that is not yet formed.

Next, the method of the present invention will be specifically explained with reference to the drawings.

First, all parts of the screw pump casing 1 except for the tray forming part 1a where the tray 2 is formed are made of concrete.
A screw pump is assembled into the casing 1 as shown in FIG.

That is, the tray forming portion 1 of the casing 1
A pair of left and right jack bolts 3 are located above a.
A support 3 and a prime mover 4 are fixedly provided, and a support 5 similar to the support 3 is provided with a pair of left and right jack bolts 5a and 5b below the tray forming portion 1a. It has been done,
Both end bearing parts 7 and 8 which bear both ends of the shaft 6a of the screw 6 are connected to the jack bolts 3a and 3, respectively.
b, 5a and 5b are also received and held, and the screw 6 is interlocked and connected to the prime mover 4 via a universal joint 9. Therefore, by screwing and adjusting each jack bolt, the bearing parts 7 and 8 can be adjusted.
The holding position of the screw 6 can be changed as appropriate, and the screw 6 can be rotated by the prime mover 4 via the universal joint 9 no matter which holding position the bearings 7 and 8 are held. .
Note that the holding position of the bearings 7 and 8 in a state where normal pump operation is performed after the tray 2 is formed is a normal holding position 0 shown in FIG. 2D.

After the screw pump is assembled in the casing 1 in this manner, the bearings 7 and 8 are eccentrically moved by a certain amount e from the normal holding position 0 while the concrete (mortar) in the tray forming part 1a is not solidified. The concrete of the tray forming part 1a is scraped off by the screw 6 while holding the bearing parts 7 and 8 in each eccentric position sequentially. explain. In addition, the eccentricity e mentioned above
is set to match the desired gap to be created between the outer circumferential surface 6b of the screw 6 and the tray 2.

First, as shown in FIG.
Hold at eccentric position _0-1 . This is done by threading the left jack bolts 3a, 5a downward and by threading the right jack bolts 3b, 5b upward.

In this state, the screw 6 is rotated and the concrete of the tray forming portion 1a is scraped off by the screw 6, thereby forming the left side portion 2a of the tray 2 in the tray forming portion 1a (the third
Figure A).

Next, as shown in FIG. 2B, a second
It is held at eccentric position ₀₂ . This is done by screwing the left jack bolts 3a, 5a upward and the right jack bolts 3b, 5b downward.

In this state, the screw 6 is rotated and the tray 2 is attached to the tray forming portion 1a by the screw 6.
(FIG. 3B).

Furthermore, as shown in FIG. 2C, bearing parts 7 and 8
, the left and right jack bolts 3a, 5a, 3b, 5
A third eccentric position 0 is achieved by screwing both parts b downward to eccentrically e a certain amount downward from the normal holding position 0.
₃ , and in this state, the screw 6 is rotated to form the lower portion 2c of the tray 2 in the tray forming portion 1a (FIG. 3C).

Therefore, according to the above method, as shown in FIG.
A certain gap 1 corresponding to the eccentricity e is provided between
Thus, an arc-shaped tray 2 that can produce 0 is formed.

Since this gap 10 is formed by the screw 6 itself that rotates the tray 2, in other words, it is formed by the scraping action of the screw 6 which is deflected in the same way as during pump operation. Therefore, regardless of the deflection of the screw 6, it remains constant at any location in the longitudinal direction of the screw 6.

Note that the eccentric positions at which the bearings 7 and 8 are held are the first, second, and third eccentric positions described above.
It is not limited to only ₁ , 0 ₂ , 0 ₃ , and the order in which they are held is also arbitrary. The point is to sequentially hold the bearings 7 and 8 at a position offset by a certain amount e from the normal holding position 0, that is, at any position on the circular arc trajectory T of radius e centered on 0, and hold them at each position. The process of scraping off the tray forming portion 1a with the screw 6, that is, the eccentric positions 0 ₁ , 0 ₂ , 0 ₃ , where the bearing portions 7 and 8 are held, is sufficient. The more trays there are, the more smoothly the tray 2 can be formed.

Further, it goes without saying that the means for holding the bearings 7, 8 eccentrically from the normal holding position 0 is not limited to the jack bolts 3a, 3b, 5a, 5b described above.

As explained above, according to the present invention, the tray is formed by scraping off the unhardened concrete in the tray forming part even when the screw itself is bent in the same way as when the pump is operating. It is possible to form a tray that can create a certain appropriate gap between the outer circumferential surface and the screw according to the deflection of the screw, and there is no need to calculate the deflection curve of the screw in advance. Formation can be easily performed.

[Brief explanation of the drawing]

The figures show an embodiment of the method for forming a concrete tray according to the present invention. Figure 1 is a longitudinal side view of the screw pump, and Figures 2A to 2D show the holding state of the bearings at both ends of the screw. 3 A to D
1A and 1B are longitudinal sectional front views showing how the trays are formed by screws (the cross section is taken along the line - in FIG. 1); FIG. 1a...Tray forming section, 2...Tray, 6...
Screw, 6b...outer peripheral surface of screw, 7,
8... Bearing portion, 10... Gap, 0... Regular holding position, 0 ₁ , 0 ₂ , 0 ₃ ... Eccentric position, e... Eccentric amount.

Claims (1)

[Claims] 1. While the concrete in the tray forming part is not solidified, the bearings at both ends of the screw are sequentially held at a plurality of eccentric positions offset by a certain amount from the normal holding position, and the bearings are moved to each of the eccentric positions. While the screw is held in place, the screw is rotated to scrape off the tray forming part with the screw, and the distance between the tray forming part and the outer circumferential surface of the screw when the bearing part is positioned at the normal holding position is A method for forming a concrete tray in a screw pump, characterized in that an arc-shaped tray is formed that can create a constant gap corresponding to the amount of eccentricity of the eccentric position described above.