JPH0326888A - Pumping tube - Google Patents

Abstract

PURPOSE:To prolong the using life and reduce the power necessary for drive by constituting the title tube from an inner surface rubber, outer surface rubber, and a reinforced cord layer set between the inner and outer surface rubbers and setting the ratio of thickness of the inner surface rubber, reinforced cord layer, and the outer surface rubber within a specific range. CONSTITUTION:The abrasion of a pumping tube 1 is generated when a roller is separated from the tube 1, and the sectional surface sharply restores a circular form, and vacuum is generated inside, and the concrete mortar on the discharge side is sucked into the vacuum part and flows in the reverse direction, and collides with an inner surface rubber 2, and scrapes the inner surface rubber 2. In order to obtain the squeeze pumping tube 1 which can be used for a long period in comparison with the conventional, the tube is constituted of the inner surface rubber 2, outer surface rubber 4 and a reinforced cord layer 5 arranged between the inner surface rubber 2 and the outer surface rubber 4, and the ratio of thickness of the inner surface rubber 2: reinforced cord 3: outer surface rubber 4 is set to 6.5-5.5:6:3.5-4.5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tube for a squeeze pump mainly used for transferring muddy materials such as Funkrete mortar.

[Conventional technology]

As an example of the squeeze pump is shown in FIG. 5, a tube 1 made of a rubber hose bent in a semicircle along the inside of a semi-cylindrical wall 5 is moved by a roller 6 moving along the inside of the tube 1. By moving the crushing position flatly so that the inner surface of the tube 1 is closed sequentially from the suction side 7 to the discharge side 8, the concrete mortar etc. sucked in from the suction side 7 is discharged from the discharge side 8. .

As shown in FIG. 1, this tube 1 has an inner rubber 2,
It consists of an outer rubber surface 4 and a reinforcing hood layer 3 disposed between the inner rubber surface 2 and the outer surface rubber layer 4. However, the conventional tube 1 is made up of solid particles contained in the slurry that is transported inside the tube. Based on the idea that the wear of the inner surface rubber 2 takes longer to reach the reinforcing hood layer 3, the thickness of the inner surface rubber 2 is made particularly thick, and the tube 1 has an outer diameter of 82 fi and an inner diameter of 50 tm.
In general, inner rubber 2, reinforcing hood layer 3, and outer rubber 4 have thicknesses of 8 m, 6 m, and 2'', respectively.

In FIG. 5, this wear of the tube is caused by the wear of the tube. This occurs as shown in b).

FIG. 4 shows the worn portion 9 of the tube 1 cut away. When this worn part 9 becomes deep, even if the tube 1 is crushed flat so that the inside is closed, the worn part 9 remains as a passage, and the amount of concrete mortar transported per unit time decreases.

This abrasion occurs when the roller 6 is removed from the tube 1 and the cross section of the tube 1 quickly restores its circular shape, creating a vacuum inside and causing the concrete mortar on the discharge side to be sucked into the vacuum and backflowing to the inner rubber 3. It is thought that this occurs when the inner rubber 3 is scraped off by colliding with the inner surface.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bombing tube for a squeeze pump that reduces the above-mentioned wear and can be used for a longer period than before.

[Means to solve the problem]

The present invention consists of an inner rubber, an outer rubber, and a reinforcing cord layer disposed between the inner rubber and the outer rubber, and the thickness ratio of the inner rubber: the reinforcing cord layer: the outer rubber is 6.5 to 5. .5
: 6 7 A bombing tube with a value of 3.5 to 4.5 is used as a means to solve the problem.

[Effect]

Inner diameter 5 Qwm, outer diameter 82 mm, inner rubber thickness 8 mm, outer rubber thickness 2 mm, reinforced hood layer I 1680 d / 4 cord layers braided at a rope angle of 54 degrees, thickness 6 mm. , the inner and outer rubber surfaces are both made of natural rubber, and the inner diameter, outer diameter, and reinforcing hood layer are the same as those of the conventional tube A1, and the inner and outer rubber thicknesses are 61JIII1 and the outer rubber thickness is 4J, according to the present invention. b. Prepare a comparison tube C with the inner rubber thickness of 4mm and the outer rubber thickness of 6mm, cut it to a length of 30cm, press it to a thickness of 32mm with the inner surface closed flat, and then As a result of observing the cross section of the inner surface when it is open, it was found that in tube a, the center in the width direction of the tube closed or opened first when it was flattened, as shown in FIG. As shown in FIG. 2, tubes b and c opened and closed at both ends before the center. For this reason, in tube a, as shown in Fig. 4(b), the part that corresponds to the center of the inner surface of the tube on the outer circumferential side is intensively worn, and in tube b, the part that corresponds to the center of the outer circumference of the tube
As shown in figure (a), tubes a are distributed on both sides of the center.
It was found that shallower wear occurred. In tube b, when the inner surface starts to open from a closed state, the communication cross section is larger than that in tube a, so the reverse flow velocity is higher than that in tube a.
This is probably because it is slower than the However, tube C, on the other hand, suffers more wear than tube B.

The reason for this is not clear, but it is thought that as the inner rubber becomes thinner than 6 gm, the inner rubber becomes harder than in the case of tube b when compressed flat.

From the above, according to the present invention, the thickness ratio of inner rubber: reinforcing cord layer: outer rubber is 6.5 to 5.5:6:3.5.
It is thought that by setting the value to 4.5, wear can be reduced compared to the conventional case.

〔Example〕

Five of each of the above tubes a, b, and c were attached to a squeeze pump, and a test of pumping 6 ml of concrete mortar per hour was conducted.5. The time it takes for the pumping amount to decrease in 3 is a: minimum 8 hours, maximum 22 hours, average 18 hours, b: minimum 38 hours, maximum 46 hours, average 4l hours, C: minimum 22 hours, maximum 36 hours, average 3
It'll be hot in two hours.

In addition, the force required to flatten tubes a, b, and c to a thickness of 32 times twice the wall thickness is 270 for a and 2 for b and c.
It was found that the weight was 20 kg, and that the power required was less than b.

In addition, two types of tubes with an inner diameter of 38 tax and 75 ms were made with the same structure as above and tested in the same manner, and the same results were obtained.

[Effects of the Invention] According to the present invention, it is possible to provide a pumping tube that has a longer service life than conventional pumps and requires less power to drive.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the tube of the present invention, and FIG. 2 is an explanatory diagram of the deformed state when the tube of the present invention is crushed.
Fig. 3 is an explanatory diagram of the deformation state when the conventional tube is crushed, Fig. 4 (a) is a diagram showing the wear state of the tube of the present invention, and Fig. 4 (1)) is a diagram showing the wear state of the conventional tube. The diagram showing the state, FIG. 5, is an explanatory diagram of the squeeze pump. 1.-Pumping tube 2..Inner surface rubber 3..Reinforcement hood layer 4..Outer surface rubber 5..Wall 6..Roller 7..Suction side 8..Discharge side 9..Abrasion parts Fig. 1 Fig. 4

Claims (1)

[Claims] (1) Consisting of an inner rubber, an outer rubber, and a reinforcing cord layer placed between the inner rubber and the outer rubber, the thickness ratio of the inner rubber: the reinforcing cord layer: the outer rubber is 6.5 to 5.5: 6:3
．． Pumping tube that goes from 5 to 4.5.