JPS5947157B2 - squeeze pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a squeeze pump for pumping out slurry such as mortar or fresh concrete.

BACKGROUND ART Conventionally, as shown in FIG. 1, a squeeze pump has an elastic tube 2 bent in an arc shape along the inner circumferential surface 1a of a pump case 1, and a rotating arm 4 fixed to a rotating shaft 3. A squeeze roller 5 is supported at the tip in parallel with the rotating shaft 3,
When the rotary arm 4 is rotated in the direction of the arrow P in the figure, the squeeze roller 5 rolls while pinching the elastic tube 2 with the inner peripheral surface of the pump case 1, so that the slurry inside the tube 2 is transferred. It was configured.

However, in this squeeze pump, the elastic tube 2 is pressed against the inner peripheral surface 1 of the pump case 1 by the squeeze roller 5.
In order to stably press the elastic tube 2 between the squeeze roller 5 and the inner circumferential surface 1a of the pump case 1, the inner circumferential surface 1a must be formed into a precise circular arc surface. However, it is not only necessary to polish the inner circumferential surface 1a so as not to damage the elastic tube 2;
It was necessary to accurately center and position the rotating shaft 3 with respect to the inner circumferential surface 1a so that the squeeze roller 5 accurately aligned with the inner circumferential surface 1a.

Moreover, when the elastic tube 2 is installed in the pump case 1 so as to be bent along an arcuate surface, its cross-sectional shape becomes a flat ellipse in the direction of the bending center of the elastic tube 2, and furthermore, the cross-sectional shape becomes a flat ellipse in the direction of the bending center of the elastic tube 2. When the tube 2 is pressed by the squeeze roller 5 in the direction of flattening the ellipse, the tube 2 is pressed by the squeeze roller 5.
Even after passing through, the tube 2 only restores its elliptical cross-section, and as the tube 2 is used, its cross-section becomes permanently deformed to an elliptical shape, resulting in a decrease in the amount of slug IJ 3 transferred.

Furthermore, in the initial stage when the pressure roller 5 presses the elastic tube 2, as shown in FIG.
The inner circumferential surface 2a of the figure changes from a circular shape to an oblong shape as shown in the figure C, to a bar shape as shown in the figure C, and then to a bar shape as shown in the figure C.
As shown in Fig. 2, the elastic tube is completely closed, but since this closing operation is performed simultaneously in the entire radial direction of the elastic tube, the particulate solids S contained in the slurry inside the elastic tube 2 are completely closed.
(Especially pebbles contained in the fresh concrete) are likely to get caught in the closing part T, and therefore the inner wall surface 2a of the elastic tube 2 is locally worn quickly, resulting in a defect that the fresh concrete cannot be transferred.

In addition, as shown in FIG. 3, even during the pressing operation of the elastic tube 2 by the pressing roller 5, the biting angle α (the angle formed by the contact end Ta of the inner wall surface 2a at the closed portion T of the tube 2) is small. Therefore, the solid matter S is easily caught in the closing portion T, and the entire inner wall surface of the elastic tube 2 is worn out at an early stage, and from this point of view as well, it has been impossible to transfer fresh concrete.

In addition, in order to eliminate the above-mentioned defects, the applicant has previously filed the fourth patent.
As shown in the figure, by pressing and rolling the pressure roller 5 from the bottom of the elastic tube 2 arranged in a straight line, the solid matter S contained in the slurry in the tube 2 is utilized to stay at the bottom due to its own weight. A squeeze pump is proposed in which the solid matter S is prevented from getting caught in the closing part T.

(Refer to Japanese Unexamined Patent Publication No. 57-51986.) However, although this squeeze pump can reduce the biting of solids to some extent, it not only complicates the drive mechanism of the pressure roller 5, but also makes it difficult to prevent the biting. In order to reduce this as much as possible, it is necessary to provide a circumferential groove on the outer periphery of the elastic tube, which raises the problem of increased product cost.

Furthermore, as shown in FIG. 5, a conventional squeeze pump for transferring clay soil deposited on rivers or the seabed has been proposed in which pressure rollers 5 are brought into contact with both the upper and lower sides of the elastic tube 2. .

(Refer to Japanese Unexamined Patent Application Publication No. 148805/1983) However, since this squeeze pump has a large biting angle α, the biting of solids in the closing part is drastically reduced, but on the other hand, the structure is more complicated than that of the pump described in Fig. 4. This was a major obstacle to practical application.

As mentioned above, there are two types of squeeze pumps: one in which the elastic tubes are arranged in an arc, and the other in a straight line.The former has a simple structure, but cannot transfer fresh concrete. Although the latter can transport fresh concrete, it has a complicated structure.

For this reason, conventional pumps for bundled concrete IJ-contact only use pumps that transfer fresh concrete by evacuating the inside of a large drum, which is different from the three methods mentioned above. was not possible.

Furthermore, as a conventional variable displacement tube pump,
Publication No. 4-24455 or Special Publication No. 50-34763
In both of these, one side of an annular elastic tube is not in contact with a fixed support plate, and the other side is pressed by a pressure roller, and the corrosive liquid or It transports liquid for continuous colorimetric analysis (both different from fresh concrete).

Therefore, the penetration angle of both becomes small, and even if this pump were to be used as a pump for transferring fresh concrete, it would be impossible to transfer it.

However, these pumps were designed specifically for liquids that do not contain solids and have low viscosity.
Until now, it has never been considered to apply a method in which elastic tubes arranged in an arc shape are pressed and rolled from the side to slurry such as ready-mixed concrete.

Purpose This invention was made to overcome the above-mentioned drawbacks, and its purpose is to efficiently transport the sura IJ-8, prevent wear of the elastic tube, and improve its durability. Moreover, it is an object of the present invention to provide a squeeze pump which is easy to manufacture and which is capable of reliably and smoothly transferring fresh concrete, mortar, etc. containing solid substances.

Embodiment Below An embodiment embodying this invention is shown in FIGS. 6 to 10.
To explain according to the drawings, reference numeral 11 indicates the entire squeeze pump, and a substantially vertical semi-cylindrical pump case 14 is fixed to a base 13 having wheels 12.

Reference numeral 15 denotes a protrusion provided so as to divide the arc-shaped inner circumferential surface of the pump case 14 into left and right halves, and an elastic tube 16 is bent into an arc shape and arranged inside the protrusion.

One end of the elastic tube 16 is supported and fixed to a support 17 fixed to the upper end of the outer circumference of the pump case 14, and the other end is supported by a support 17 fixed to the base 13.
It is supported and fixed to 8.

Reference numeral 19 denotes a rotating shaft that is rotatably supported near both ends by the side plates of the pump case 14 and revolves the roller 22 described below, and as shown in FIG. The sprocket 20 is fixed.

21 is a support shaft whose base end is fixed at right angles to the rotating shaft 19, and a total of four supporting shafts are provided in opposite directions around the rotating shaft 19, in pairs, and a roller 22 is attached to the tip of each supporting shaft. The rollers 22 are provided to be rotatable around the shaft 21, and when the rotary shaft 19 rotates clockwise in FIG. It rolls on the outer surface of the tube 16 while being clamped.

Further, the top of the roller 22 is tapered in diameter, and the tapered surface 22a, the side surface 22b of the roller 22, and the top surface 2
2C and each curved surface are smoothly continuous.

Reference numeral 23 denotes a pair of restoration rollers which are formed opposite each other at a position of 90° (less than 90° is also possible) from the support shaft 21 and the roller 22 with the rotating shaft 19 as the center, and are shown in FIGS. 6 and 8. As shown, the base end is rotatably supported by a support shaft 24 fixed to the rotating shaft 19. As shown in FIG.

When the rotating shaft 19 rotates, the restoring roller 23 rolls while slightly pressing the elastic tube 16, which has been deformed into a flat shape in the longitudinal direction by the roller 22, from the inside.
The elastic tube 16 is restored to its cylindrical shape, and movement of the elastic tube 16 in the direction of the rotation axis 19 is restricted.

Reference numeral 25 denotes a motor support plate rotatably supported on a shaft 26 on the surface of the pump case 14, and one end of the motor support plate 25 is rotatably supported on the circumferential surface of the pump case 14 in a long hole 25a provided above. Bolt 29 screwed together with nut 28
is inserted.

30 is a motor for driving the rotating shaft 19 supported by the motor support plate 25, and a chain 32 is connected between the sprocket 31 and the sprocket 20 at one end of the rotating shaft 19.
is hung.

When the motor 30 is not operating, the weight of the motor 30 causes the motor support plate 25 to rotate in the direction of arrow E in FIG. 6, thereby tensioning the chain 32.

In this state, if the nut 28 is moved to a position where it contacts the motor support plate 25, the chain 32 will remain under tension even when the motor 30 is activated and a tensile force is applied to the motor 30 in the direction of the pump case 14. It is designed to be kept in a stable condition.

Next, the operation of the squeeze pump configured as described above will be explained.

Now, operate the motor 30 to move the rotating shaft 19 to the arrow F in FIG.
When rotated in the direction, the preceding pair of rollers 22
As shown in Figure a, it starts contacting the elastic tube 16 from below, and as shown in Figure A, it gradually intersects and pinches the elastic tube 16, and at this stage, a small portion of the inner wall surface 16a is pressed against each other. A closure T is formed.

This closure T increases as shown in FIG. 9 to C, and when both rollers 22 reach the vertical position as shown in FIG. 8, the tube 16 is shown in FIG. Completely pressurize as shown, and the formation of the closed part T is completed.

At this time, as the elastic tube 16 deepens its intersection with the rollers 22, it gradually adapts to both rollers 22, and is eventually completely pressed.

The confinement angle β of the cross section of the elastic tube 2 when the pressure roller 22 starts confining the elastic tube 16 is the 9th
As is clear from the figure, how to close a pump that is very large and has conventional elastic tubes arranged in an arc shape (Figure 2 a - d)
Since the closing part T gradually becomes larger, the solids S are not bitten into the closing part T, and therefore it is particularly suitable for transferring fresh concrete.

By the way, a pair of rollers 22 are also located at a position 180° behind the preceding roller 22, and the elastic tube 16
As a result, the slurry in the tube 16 between the pair of rollers 22 is transferred to the roller 22.
is transferred in the direction of rotation.

At this time, when the elastic tube 16 is viewed in longitudinal section as shown in FIG.
Since the pressure rollers 22 are pinching from both sides, the size is almost twice as large as that of the conventional example shown in FIG. .

Here, the conventional elastic tube 2 is attached to the inner peripheral surface of the pump case.
In the configuration in which the elastic tube 2 is pressed against the inner peripheral surface 1a
However, in this embodiment, the elastic tube 16 is pushed by a pair of rollers 22, which causes the elastic tube 16 to be stretched slightly and generate heat due to strong friction, which causes premature wear of the tube 2. Since the tube 16 is pinched from both sides, the disadvantages of the conventional tube 16 can be eliminated, wear of the tube 16 can be prevented, and its durability can be improved.

The elastic tube 16, which is bent in an arc shape and arranged inside the pump case 14, has an elliptical cross section as in the conventional example. is clamped from the long axis direction.

Then, after the tube 16 passes the roller 22, it tries to restore itself to an elliptical cross-sectional shape again, so that the slurry can be efficiently sucked into the tube 16.

Therefore, the pump case 14 is theoretically unnecessary, and it is sufficient to use only a cover, and there is no need to polish the inner circumferential surface of the pump case, and the positioning of the rotating shaft 19 can be roughly set, making it possible to reduce the cost and easily. can be manufactured.

In particular, the present invention uses a simple method in which elastic tubes arranged in an arc shape are rolled and pressed by pressing rollers, but by focusing on a unique structure in which an unstable elastic tube is clamped and pressed by rollers from the force on both sides. It is now possible to transfer fresh concrete, which was previously considered impossible, and to reduce costs.The present invention can solve the big problem of transferring fresh concrete using an arcuate method all at once. It was.

Furthermore, by providing a condition 15 in which the bending diameter of the elastic tube 16 is set at the center of the inner surface of the pump case 14 so that the elastic tube 16 is reliably clamped by the rollers 22, the elastic tube 16 can be easily inserted into the pump case 14. Installation can be done easily.

Note that the present invention is not limited to the above-mentioned embodiments, but can also be implemented in the following embodiments.

(a) As shown in FIG. 11, a support rail 33 is provided protruding from the inner peripheral surface of the pump case 14, and
A support roller 34 that rolls while contacting the support rail 33 is provided at the tip of the support rail 33.

In this way, since the roller 22 is rotatably supported at both ends, the elastic tube 16
can be stably clamped.

(b) As shown in FIG. 12a, the tip of the roller 22 is formed into a hemispherical shape, the corner of the tip is formed into a curved surface as shown in FIG.
A flange 35 is formed at the two base ends.

(c) Three or more pairs of rollers 22 are provided.

Effects As described above, in this invention, the free rotation axis of the roller 22 is provided in a direction perpendicular to the rotation axis 19 on which the roller 22 revolves, and a plurality of pairs of rollers 22 are arranged parallel to each other so as to correspond to each other. By arranging the elastic tubes 16 in parallel with each other and pinching the elastic tubes 16 from both sides with each pair of rollers 22, it is possible to transfer the slurry efficiently and prevent wear of the elastic tubes, thereby improving its durability. This is an excellent invention that can provide a squeeze pump that is easy to manufacture and can transfer fresh concrete, which was previously impossible.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional squeeze pump,
Fig. 1 is a longitudinal cross-sectional view, Fig. 2 a - d are cross-sectional views explaining the working state, Fig. 3 is a partial longitudinal cross-sectional view, and Figs. 4 and 5 are longitudinal cross-sections showing different conventional examples. 6 is a side view showing a squeeze pump according to an embodiment of the present invention, FIG. 7 is a front view of the main parts thereof, FIG. 8 is a vertical sectional view thereof, and FIGS. 9 and 10. FIG. 11 is a partial front view showing another example of the present invention, and FIG. 12 is a front view showing another example of the roller.

Claims (1)

[Scope of Claims] 1. In a squeeze pump that suctions and discharges slurry by moving and pressing an elastic tube arranged in an arc shape with a plurality of rollers that revolve while rotating, the roller 22 is made to revolve. The free rotation axes of the rollers 22 are provided in a direction perpendicular to the rotating shaft 19, and a plurality of pairs of rollers 22 are arranged parallel to each other so as to correspond to each other. A squeeze pump characterized in that it is configured to apply pressure from both sides. 2. The scope of the claims characterized in that the top of the roller 22 is tapered in diameter, and the tapered surface 22a is formed so as to be continuous with the side surface 22b and the top surface 22c of the roller 22 in a curved surface. The squeeze pump according to paragraph 1. 3 The rotating shaft 19 is rotatably supported at both ends by the side plates of the semi-cylindrical pump case 14.
2. The squeeze pump according to claim 1, wherein protrusions 1 and 5 are provided on the arcuate inner circumferential surface of the elastic tube 16 so as to come into contact with the outer periphery of the elastic tube 16.