JP2004115253A - Segment screw conveyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment screw conveyor, easy to manufacture while having high machining accuracy . <P>SOLUTION: Inside a transfer guide tube 1, the screw conveyor transfers a material in the axial direction by rotating a screw blade mounted to a driving shaft. A segment screw blade 8 to be mounted to the driving shaft 4 of the center shaft, has a semi-oval shape obtained by halving an oval at a major axis, wherein the major axis a of the oval is given by a=D/(2sinθ)and the minor axis of the oval is given by b=D/2, where the extrusion angle of the segment screw blade is θ, and the inner diameter of the transfer guide tube 1 is D. A first segment screw blade 8a is inclined with an extrusion angle of θ, and secured to the driving shaft 4 from the front side. A second segment screw blade 8b adjacent to the first segment screw blade 8a, is inclined with an angle of 180°-θ, and is secured to the driving shaft 4 from the rear side. Thus the segment screw blades 8 are secured one by one in a zigzag configuration. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a segment screw conveyor for transferring solids.
[0002]
[Prior art]
Conventionally known screw conveyors have a spiral curved surface shape in which screw blades are continuous, and the screw blades are rotated by a drive shaft to transfer solids and the like in the axial direction.
[0003]
[Problems to be solved by the invention]
Conventional screw conveyors:
1. 1. Requires a dedicated processing machine; 2. It is difficult to manufacture a screw having an arbitrary outer diameter according to the inner diameter of the transfer guide cylinder. 3. The processing accuracy is difficult to obtain, and the inner diameter of the transfer guide cylinder, the outer diameter of the screw and the clearance cannot be set arbitrarily. Production costs are high.
In the conventional screw conveyor, when manufacturing a screw blade, it is necessary to process a metal plate into a spiral curved surface shape, and there is a problem that processing accuracy is difficult to obtain and processing is difficult.
SUMMARY OF THE INVENTION An object of the present invention is to provide a segment screw conveyor having a high processing accuracy at a low cost without using a dedicated processing machine, in which a screw blade having an arbitrary size can be easily manufactured.
[0004]
The present invention has been proposed to solve such problems of the conventional technology, and has an object to provide a segment screw conveyor that is easy to manufacture and has high processing accuracy.
In the transfer device described in Japanese Patent Application Laid-Open No. 2001-240232, a device in which a screw blade is formed in a substantially semi-elliptical plate shape has been proposed.
However, it is difficult to process the screw blade into a semi-elliptical shape instead of a semi-elliptical shape, and there is a problem that machining accuracy is not high.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a screw conveyor in which a screw blade attached to a drive shaft is rotated in a transfer guide cylinder to transfer an object to be transferred in an axial direction. When the inner diameter of the transfer guide cylinder is D, the major axis a of the ellipse is
a = D / (2 sin θ)
And the minor axis b of the ellipse is
b = D / 2
When the segment screw blade having a semi-elliptical shape obtained by half-cutting the ellipse given by 長 into a semi-elliptical shape is attached to the drive shaft of the central axis, the first segment screw blade has an extrusion angle θ (θ with respect to the drive shaft or the transfer guide cylinder). Degree) and fixed to the drive shaft from the front side, and the second segment screw blade adjacent to the first segment screw blade is fixed to the drive shaft from the rear side by tilting at 180 ° -θ, It is characterized in that the segment screw blades are sequentially fixed in a zigzag manner to the drive shaft.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of a segment screw conveyor according to the present invention, and FIG. 2 shows a longitudinal sectional view of a main part. FIG. 3 is a sectional view taken along line AA of FIG. In these figures, a drive shaft 4 rotatably supported by bearings 2 and 3 at both ends of the cylindrical transfer guide cylinder 1 is mounted in the center axis direction of the cylindrical transfer guide cylinder 1. Also, an intermediate shaft coupling 5 that rotatably supports the drive shaft 4 is attached to a middle portion in the cylinder. In the figure, reference numeral 6 denotes an oilless bush. Reference numeral 7 denotes a fixed plate.
[0007]
A plurality of plate-shaped segment screw blades 8 having a semi-elliptical shape for transferring solids in the transfer guide cylinder 1 in the axial direction are attached to the drive shaft 4.
Next, the configuration of the segment screw blade 8 will be described.
As shown in FIG. 4, when the pushing angle of the segment screw blade 8 is θ and the inner diameter of the transfer guide cylinder 1 is D, the major axis a of the ellipse is
a = D / (2 sin θ)
And the minor axis b of the ellipse is
b = D / 2
Given by In the figure, reference numeral 9 denotes a projection circle of an ellipse.
Also, as shown in FIG. 5, the equation of the elliptical coordinates of the major axis a and the minor axis b is:
y ² = (b ² / a ² ) (a ² −x ² )
It becomes.
[0008]
As for the shape of the drive shaft mounting hole of the segment screw blade, the outer diameter of the drive shaft is d, and when the extrusion angle of the segment screw blade is θ, the major axis of the ellipse is C = d / (2 sin θ).
The minor axis of the ellipse is S = d / 2
A segment screw blade having a drive shaft mounting hole obtained by half-cutting the ellipse given by the above in a long axis, when mounting with the drive shaft, the first segment screw blade, the long axis C, the ellipse given by the short axis S By fixing the drive shaft mounting hole cut in half with the long shaft so as to be inscribed in the outer periphery of the drive shaft, the first segment screw blade inclined at the extrusion angle θ can be automatically fixed to the drive shaft from the front side. The second segment screw blade adjacent to the first segment screw blade is provided with a long axis d / 2 sin θ and a short axis d / 2 on the rear side of the drive shaft with the normal to the drive shaft center line as a symmetric axis. By fixing the drive shaft mounting hole, which is cut in half by the major axis of the ellipse, so as to be inscribed in the outer periphery of the drive shaft, the first segment screw blade inclined at an angle θ to be automatically pushed out is 1 Fixing a second segment screw blade which is inclined at 0 ° - [theta], segment screw conveyor is formed by fixing the segment screw blade on the drive shaft successively in a zigzag shape.
[0009]
As shown in FIG. 6, the segment screw blade 8 has a semi-elliptical shape obtained by half-cutting an ellipse with a long diameter a. The attachment of the segment screw blade 8 to the drive shaft 4 is performed as follows.
As shown in FIG. 2, first, the first segment screw blade 8 a is inclined at an extrusion angle θ with respect to the drive shaft 4, and the central shaft recess 10 (see FIG. 6) of the blade 8 a is brought into close contact with the drive shaft 4. The blade 8a is fixed to the drive shaft 4 by welding or the like.
[0010]
After the first segment screw blade 8a is tilted at an angle θ from the front side and fixed to the drive shaft 4, the second segment screw blade 8b is tilted at an angle of 180 ° -θ from the rear side. To be fixed. At this time, the tip of the first segment screw blade 8a is aligned with the tip of the second segment screw blade 8b. Thus, the segment screw blades 8 are attached to the drive shaft 4 in a zigzag manner.
[0011]
In this embodiment, the tip of the first segment screw blade 8a and the tip of the second segment screw blade 8b are aligned, but the distance between the tips of the blades 8a and 8b is different depending on the solid to be transferred. If the size is smaller than the size of the material, the solid material can be transferred by the segment screw blade 8 without any problem.
[0012]
In the segment screw conveyor configured as described above, when the drive shaft 4 is rotated rightward in the transport direction by a rotation drive device (not shown), the solid matter put in from the input port 11 (see FIG. During the half rotation of the blade 8a by the segment screw blade 8a, the blade 8a is pushed out to the right in the drawing, and subsequently inherited by the second segment screw blade 8b. It is extruded to the segment screw blade 8a, and is sequentially transferred to the discharge port 12 one after another, so that the solids fall from the discharge port 12.
[0013]
In the above-described embodiment, the transfer guide cylinder 1 has a cylindrical shape, but may have a semi-cylindrical cross section instead of a cylindrical shape.
The state of connection between the first and second segment screw blades (8a, 8b) and the drive shaft will be described below with reference to FIG.
In the same figure, the connection state between the first segment screw 8a and the drive shaft 4 is indicated by the “projection view of the angle θ cross section of the transfer guide cylinder (D) and the drive shaft (d)” as shown in FIG. Each of the portion K and the coupling portion M of the drive shaft 4 is formed in a shape represented by an ellipse having a major axis d / 2 sin θ and a minor axis d / 2.
This means that the first segment screw 8a can only be attached to the drive shaft 4 while being inclined at a predetermined angle θ, and otherwise cannot be attached to the shaft driving roller 4.
The connection mode of the second segment screw 8b is the same as the mounting mode of the first segment screw.
As shown in FIG. 8, the first segment screw 8a and the second segment screw 8b are set so that the tip ends 8a 'and 8b' of the respective segment screws are located at target positions with respect to the axis of symmetry. is there.
[0014]
【The invention's effect】
As described above, according to the present invention, since the segment screw blade is formed in a semi-elliptical shape in which the ellipse is cut in half with a long diameter, there is an advantage that the blade can be easily processed and the processing accuracy can be easily obtained.
Therefore, there is an advantage that the gap between the outer circle (circle) of the rotation locus of the segment screw blade and the inner periphery of the transfer guide cylinder can be maintained with high accuracy.
Also, in the present invention, the shape of the connecting portion of the first and second segment screws and the connecting portion M of the drive shaft is formed as an ellipse having a major axis of d / 2 sin θ and a minor axis of d / 2. When connecting to the drive shaft, it can be mounted only at an angle θ with respect to the drive shaft, so it can be easily mounted at the time of connection, furthermore it can be processed easily, and the connection state is accurate and tight Can be done.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of a segment screw conveyor according to the present invention.
FIG. 2 is a longitudinal sectional view showing a main part of the segment screw conveyor.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a diagram showing a relationship between an extrusion angle θ and a segment screw blade.
FIG. 5 is a diagram showing an ellipse.
FIG. 6 is a view showing a segment screw blade.
FIG. 7 is an explanatory view schematically showing a structure of a segment screw conveyor.
FIG. 8 is an explanatory diagram showing a coupling relationship between a segment screw blade and a drive shaft.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transfer guide cylinders 2, 3 Bearing 4 Drive shaft 5 Intermediate shaft coupling 6 Oil-free bush 7 Fixed plate 8 Segment screw blade 8a First segment screw blade 8b Second segment screw blade 9 Elliptical projected circle 10 Center shaft recess 11 Inlet 12 Outlet K Shaft diameter M of drive shaft mounting hole for first and second segment screws Shaft diameter of drive shaft mounting hole for mounting first and second segment screw blades on drive shaft

Claims (1)

In the transfer guide cylinder, by rotating the screw blades attached to the drive shaft, in the screw conveyor to transfer the transferred object in the axial direction,
Assuming that the extrusion angle of the segment screw blade is θ and the inner diameter of the transfer guide cylinder is D, the major axis a of the ellipse is
a = D / (2 sin θ)
And the minor axis b of the ellipse is
b = D / 2
When attaching the segment screw blade in a semi-elliptical shape obtained by cutting the ellipse given by in the major axis to the drive shaft of the central axis, the first segment screw blade is inclined at the extrusion angle θ and fixed to the drive shaft from the front side. The second segment screw blade adjacent to the first segment screw blade was tilted at 180 ° -θ and fixed to the drive shaft from the rear side, and the segment screw blade was sequentially fixed in a zigzag shape to the drive shaft. A segment screw conveyor characterized in that:

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