JPH08611B2 - Compact screw conveyor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vertical screw conveyor in which a cargo intake port is located at the lowermost end, and rotating screw blades are exposed at the lowermost end. The present invention relates to a vertical screw conveyor, which is intended to be smoothly taken into the vertical screw conveyor.

[Prior Art] Conventionally, a vertical screw conveyor has been used as one of the devices for dredging sludge such as sludge accumulated on the seabed, in which the screw blade 4 has a lowermost end as shown in FIG. A vertical screw conveyor 1 of the type in which the screw blades 4 are overhung from the casing 2 and the screw blades 4 are exposed from the casing 2 was used.

[Problems to be Solved by the Invention] However, when the above-mentioned conventional vertical screw conveyor is adopted, when solid foreign matter is mixed in the transported object, the foreign matter is sent to the exposed screw blades and rises. Between the screw blades and the bottom end surface of the casing when reaches the bottom end surface of the casing. Due to the action, the screw blades are pressed against each other, and the smooth rotation of the screw blades is impeded, causing an accident that damages the lowermost end surface of the casing and the screw blades that are in contact with foreign matter.

[Means for Solving the Problems] In order to solve the above-mentioned problems, a vertical screw conveyor of the present invention includes a rotary shaft housed in a vertical casing and screw blades fixed to the rotary shaft. And,
In a vertical screw conveyor having screw blades exposed from the casing at the lowermost end, the screw blade is fixed to the screw blade at the lowermost end and rotates integrally with the screw blade, and the outer diameter is approximately equal to the inner diameter of the casing. The ring-shaped scraper is arranged near the lowermost end surface of the casing.

[Operation] In the present invention, since the ring-shaped scraper that rotates integrally with the screw blade is attached to the screw blade in the vicinity of the lowermost end surface of the casing of the exposed portion, it is generated between the screw blade and the lowermost surface of the casing. Was The function is lost, and it is possible to prevent foreign matter from being caught.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1 taken along line II-II, and FIG. 3 is a vertical sectional view showing another embodiment of the present invention. The drawing is a plan view taken along the line IV-IV in FIG.

In the figure, a vertical screw conveyor 1 has a screw blade 4 fixedly mounted on a rotary shaft 3 coaxially provided in a vertically extending casing 2, and the rotary shaft 3 is provided with a coupling (not shown) at the upper part. It is driven and rotated by the reduction motor 5 in communication.

At the lower end of the vertical screw conveyor 1, the rotary shaft 3 and the screw blades 4 are exposed, and the ring is provided immediately below the lowermost end surface 2a of the casing 2 of the vertical screw conveyor 1 and close to the lowermost end surface 2a. A scraper 8 having a shape (donut shape) is fixed to the screw blade 4.

The transported material is sucked through the suction port 6, rises in the casing 2, and is discharged through the discharge port 7.

In the vertical screw conveyor 1 of the present invention configured as described above, for example, soft mud such as sludge is fluid and easily deformable and is introduced into the casing 2 through the suction port 6 without any trouble. On the other hand, foreign matter composed of iron pieces, wood pieces, rocks, and other solid matter may be taken into the screw blade 4 and introduced into the casing 2 without any trouble, but in some cases, the casing blade 2 is exposed from the exposed portion.
When passing through the lowermost end face 2a of the above, it may be caught between the screw blades 4 and the lowermost end face 2a and cause an excessive force to the device.

The present invention prevents the foreign matter from being dislodged and introduced into the ring-shaped scraper 8 due to the presence of the ring-shaped scraper 8 in such a case. That is, the foreign matter loaded on the exposed screw blade 4 continues to rise as it is, but is prevented from coming into contact with the ring-shaped scraper 8 at the lowermost end face 2a and further rising, and the subsequent foreign matter of the screw blade 4 is prevented. It cannot be pushed into the screw conveyor 2 by being pushed outward due to the rotation.

FIGS. 3 and 4 show another embodiment, in which a plurality of round bars are radially welded to the rotary shaft 3 as a bar-shaped scraper 8. Also in this case, the foreign matter that is pushed up by the screw blades 4 and ascends comes into contact with the rod-shaped scraper 8 and is repelled laterally, and is prevented from entering the screw conveyor 2.

[Advantages of the Invention] The present invention, as described above, prevents foreign matter from entering the casing due to the foreign matter mixture preventing action of the scraper. Therefore, overload trouble of the power system can be prevented, and damage to the equipment can be prevented. Continuous stable operation can be realized.

[Brief description of drawings]

1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1 taken along line II-II, and FIG. 3 is a vertical sectional view showing another embodiment of the present invention. Fig. 3 is a plan view seen from Fig. 3 IV-IV.
The drawing is a longitudinal sectional view showing a conventional embodiment. 1 ... Vertical screw conveyor, 2 ... Casing, 2a ...
… Lowest end face, 3 …… Rotary axis, 4 …… Screw blade, 5 ・ ・ ・
... Reduction motor, 6 ... Suction port, 7 ... Discharge port, 8 ... Scraper.

Claims (1)

[Claims] 1. A vertical screw conveyor having a rotary shaft housed in a vertical casing and screw blades fixed to the rotary shaft, and having screw blades exposed from the casing at the lowermost end. It is fixed to the screw blade at the lower end and rotates integrally with the screw blade, and
A vertical screw conveyor, wherein a ring-shaped scraper having an outer diameter substantially equal to the inner diameter of the casing is disposed in proximity to the lowermost end surface of the casing.