JPS605489B2 - Screw conveyor for powder and granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw conveyor for powder and granular material that conveys powder and granular material by a continuous spiral body that rotates along the inner surface of a cylindrical body in a vertical orientation.

Conventionally, a screw conveyor is generally constructed by housing a continuous spiral body within a cylinder having the same diameter in the length direction.

When such a screw conveyor is used to transport powder and granules, the pitch of the spiral is made smaller than when horizontally conveying, in order to avoid co-rotation of the powder and the spiral body and carry out efficient tin transport. It is considered to be taken. In other words, this is a method that increases the angle of inclination that the helix forms with the axis of rotation, reduces the component force in the rotational direction applied to the powder, and increases the component force in the upward direction, which is considered common knowledge in the art. However, even such a device is not a good countermeasure against the co-rotation, and its tin feeding efficiency is still low, especially in the vicinity of the rotation axis where the inclination angle is inevitably small. The reality is that the powder remains without being pumped up at all, and when powder or granules become clogged in the cylinder, no means have been found to solve the problem. The first invention is
To provide a useful screw conveyor for powder and granular material for tin transport, which has been developed in view of the above-mentioned circumstances, and which has high tin transport efficiency and can prevent transport troubles due to clogging of the powder or granular material in a cylindrical body. The purpose of the second invention is to
It is an object of the present invention to further improve the screw conveyor for powder and granular materials of the first invention, and to provide a screw conveyor for powder and granular materials that can carry out smooth and reliable lifting without stagnation.

The first invention provides a screw conveyor for powder and granular materials that transports powder and granular materials by a continuous spiral body that rotates along the inner surface of a cylindrical body in an up-down direction, in which the continuous spiral body is constructed from a thin plate, and is identical to the cylindrical body. The cylindrical body is installed on a core-shaped rotating shaft, and the cross-sectional area of the internal space of the cylindrical body is continuously expanded upward, and the outer diameter of the helical body is set such that the gap between the cylindrical body and the helical body is approximately constant. It is characterized by the fact that it expands continuously as it goes upward along the inner surface of the cylindrical body.

With this configuration, the pushing force against the inner surface of the cylindrical body due to centrifugal force is reliably applied upward to the powder body due to the wide receiving surface of the helical body made of thin plates whose rotation radius increases upward in the pumping direction. It acts more strongly on the side.

Due to this force, the powder and granules are released from co-rotation with the spiral body due to the resistance with the inner surface of the cylinder, and the powder and granules are lifted up by the thin plate-shaped spiral body that rotates along the inner surface of the cylinder as it reaches the upper part. The powder is shaped to be easily susceptible to force, and the upward tin feeding force generated by pressing against the inclined cylinder inner surface acts reliably on the powder, and the receiving surface of the spiral body that receives the powder is more likely to Because of the increased size, the density per unit volume of the transported granular material with respect to the space inside the cylinder decreases as it reaches upward, and the ability to feed tin without any interference inside the cylinder further increases. Moreover, in order to feed powder and granules, a thin plate spiral body is rotated along the inner surface of a cylindrical body in an up-and-down direction, which naturally reduces the possibility of powder being pinched between the cylindrical body and the spiral body. As a whole, the powder can be transported efficiently and reliably.

Furthermore, even if clogging occurs in the middle part of the inside of the cylinder, it is likely that it will move upward due to factors such as the difference in powder density per unit volume with respect to the space inside the cylinder in the vertical direction of the cylinder. There is an advantage that the story etc. can be easily solved because it is exposed.

In addition, the second invention provides a screw conveyor for powder and granular material that transports powder and granular material by means of a continuous spiral body rotating along the inner surface of a cylinder in an up-down direction. The cylindrical body is installed on a core-shaped rotating shaft, and the cross-sectional area of the internal space of the cylindrical body is continuously expanded upward, and the outer diameter of the helical body is kept constant, and the gap between the cylindrical body and the helical body is approximately constant. A screw conveyor for powder and granular materials, which continuously expands upward along the inner surface of the cylindrical body, and is characterized in that the shaft diameter of the rotating shaft of the spiral body increases upwardly. In other words, particles tend to stagnate near the rotating shaft of the helix where the tin feeding force is much smaller than that at the outer periphery, and this second invention focuses on this point. In this case, the diameter of the shaft portion is actively expanded upward, and the powder and granules are pushed out near the outer periphery of the helix where the pumping force is large. This solves the problem of stagnation. This has the advantage that it is possible to avoid the adverse effects caused by deterioration and decay of the material, and to further ensure the effects described in the first invention.

Next, embodiments of the present invention will be described based on the drawings.

A rotating shaft 2 is installed concentrically within a cylinder 1 with both ends closed, and a continuous spiral body 3 made of a thin plate is attached to the rotating shaft 2. Then, a motor 4 moves the spiral body 3 into the cylinder body 1. A screw conveyor is configured to be driven to rotate along the inner surface and to feed tin in the direction of the rotation axis from the lower supply port 5 toward the upper discharge port 6.

The inner wall surface of the cylinder 1' is inclined with respect to the two rotational axes so that the cross-sectional area of the internal space thereof increases continuously toward the conveyance direction, and this inclined inner wall surface and the spiral body 3 The outer diameter of the helical body is expanded along the inner wall surface while keeping the gap between the helical body and the helical body almost constant. The angle formed by the spiral body 3 with respect to a perpendicular plane becomes smaller toward the upper side.

As shown in FIG. 2, the discharge port 5 can be moved in a substantially tangential direction to the spiral body 3, and preferably the angle can be changed in order to scrape out the granular material of the spiral body 3 toward the discharge port 5. A scraper 7 is attached to the cylindrical body 1, so that the powder and granules can be smoothly and reliably discharged.

As mentioned above, by increasing the cross-sectional area of the internal space of the cylinder 1 toward the conveyance direction, the volume of the space located between the helical bodies 3 increases toward the conveyance direction. It is possible to reduce the density per unit volume of the powder and granular material with respect to the space within the cylindrical body, and to create a form in which the powder and granular material can easily move upward, thereby avoiding clogging of the powder and granular material.

At the same time, since the outer circumferential portion of the blade of the spiral body 3 approaches the horizontal position as it approaches the conveyance direction, co-rotation of the spiral body 3 and the granular material becomes more difficult to occur, and the accumulation of conveyance delays is suppressed.
Since the pitch of the spiral body 3 is constant, an efficient conveyance function cannot be established. In the screw conveyor shown in FIG. 3, only the shape of the rotating shaft 2 is changed from the previous embodiment, and the diameter of the rotating shaft 2 is increased toward the conveying direction.

That is, even if the inclination angle of the inner wall surface of the cylinder 1 with respect to the rotation axis of the spiral body 3 is increased, the diameter of the rotation shaft 2 is adjusted so that the distance between the inner wall surface of the cylinder 1 and the rotation shaft 2 does not increase more than necessary. The conveyance direction increases as the conveyance direction increases, thereby preventing the conveyed object placed on the spiral body 3 near the rotating shaft 2 from rotating integrally with the spiral body 3 and not being conveyed. In the present invention, the pitch of the spiral body 3 may be increased toward the conveyance direction as long as the lead angle of the helix 3 does not increase toward the conveyance direction. In this case, the conveyance speed can be increased.

[Brief explanation of drawings]

The drawings show an embodiment of the screw conveyor for powder and granular materials according to the present invention, FIG. 1 is a longitudinal sectional view showing the first invention, FIG. 2 is a sectional view taken along the Rollo line in FIG. 1, and FIG. FIG. 2 is a longitudinal cross-sectional view showing the invention. 1... Cylindrical body 2... Rotating shaft, 3... Spiral body. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A screw conveyor for powder and granular materials that transports powder and granular materials by a continuous spiral body 3 that rotates along the inner surface of a cylinder 1 in a vertical orientation, wherein the continuous spiral body 3 is constructed from a thin plate. The helical body 3 is installed on a rotating shaft 2 concentric with the cylindrical body 1, and the cross-sectional area of the internal space of the cylindrical body 1 is continuously expanded upward, and the outer diameter of the helical body 3 is 1 and the spiral body 3 while keeping the gap substantially constant.
1. A screw conveyor for powder and granular material, characterized in that the screw conveyor is continuously enlarged upward to follow the inner surface of the powder. 2. In a screw conveyor for powder and granular materials that transports powder and granular material by a continuous spiral body 3 rotating along the inner surface of a cylinder 1 in a vertical orientation, the continuous spiral body 3 is constructed from a thin plate and is the same as the cylinder 1. The cylindrical body 1 is installed on a core-shaped rotating shaft 2, and the internal space cross-sectional area of the cylindrical body 1 is continuously expanded upward, and the outer diameter of the helical body 3 is made different from that of the cylindrical body 1 and the helical body 3. While keeping the gap almost constant, the cylindrical body 1
This screw conveyor for powder and granular materials is continuously enlarged upward to follow the inner surface of the screw conveyor, and is characterized in that the shaft diameter of the rotating shaft 2 of the spiral body 3 is enlarged upward. Screw conveyor for powder and granular materials.