JP2539278Y2 - Screw conveyor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw conveyor for conveying powdery or granular materials in the axial direction by rotation of a screw blade, and more particularly to a structure for preventing abrasion of an inner surface of an outer cylinder (screw casing) surrounding the screw blade.

[0002]

2. Description of the Related Art A screw conveyor of this type is inserted into an outer cylinder such that a screw blade has a slight gap with respect to the inner surface of the outer cylinder. The powder particles taken in from one end of the outer cylinder are constrained between the screw shaft and the screw blade formed on the outer periphery of the screw shaft and the inner surface of the outer cylinder by the rotation of the spiral screw blade, and the screw shaft is rotated. And pushed out from the other end of the outer cylinder. In the case of a material having high abrasion, the inner surface of the outer cylinder and the outer periphery of the blade are worn due to the abrasion of the powder and granules, thereby lowering the transfer capacity. Repairs such as hardfacing are performed, but the outer cylinder side is also a strength member, so the whole can not be repaired uniformly, and if it becomes thin due to wear and there is a hole, it is welded by applying a patch plate to that part, When the number of such locations increases, the entire outer cylinder is replaced.

[0003] Eliminating the uneconomical cost of replacing the entire outer cylinder,
Further, in order to eliminate difficult replacement work, the trough of the horizontal screw conveyor is divided into an upper half and a lower half, and only the lower half of the trough where wear tends to occur is replaced (for example, Japanese Utility Model Laid-Open No. 59-74915). No.) Or, insert a thin plate into the inside of a U-shaped cross section of a horizontal screw conveyor by bending it into a U-shape, and then contact the upper edge of the U-shaped thin plate with the fixing brackets provided on both upper inner surfaces of the trough. There is also disclosed a structure in which only the thin plate is replaced when the thin plate is worn (for example, Japanese Utility Model Laid-Open No. 61-191319). others
Screw shell outer shell case is doubled, inner case
Made of hard resin material to prevent grain damage of the transported goods
And the inner case to the outer case with the type of grain
On the other hand, there is also one that can be freely inserted and removed (Japanese Patent Laid-Open No. 4-5181).
No. 9).

[0004]

[Problems to be Solved by the Invention] The outer cylinder of the vertical screw conveyor is equipped with a mounting bracket, a swinging mechanism at the upper end and other various accessories, and it takes time and effort to replace the entire outer cylinder, and it is not easy. Economy. A horizontal screw conveyor in which the lower half of the U-shaped trough is replaceable has the same problem. In addition, the U-shaped trough has a replaceable U-shaped thin plate adhered to the lower half of the U-shaped trough.
In the device disclosed in JP-A-191319, since the U-shaped thin plate is merely fixed by contacting both side edges of the U-shaped thin plate with the fixing bracket of the trough, the thin plate may be displaced with the rotation of the screw blade. Due to the shape of the thin plate, it is easily deformed during operation or at the time of replacement, and there is a problem that reliability is lacking. Also, the above-mentioned Japanese Patent Application Laid-Open No.
In the grain transport device described in the report, the inner case is
Insert from the upper ends, and connect only the upper ends of these two cases to each other.
And the lower end of the inner case is free.
The lower end side of the inner case through the conveyed material with the rotation of the Ryu blade
Cause the inner case to twist, causing the inner case to twist.
There was a title.

[0005]

Means for Solving the Problems The present invention, in the screw conveyor rotatably the screw vanes on the inside of the outer cylinder, two having an outer flange portion at one end against one of the outer cylinder Cylindrical sleeves are inserted into the inner surface of the outer cylinder from both ends of the outer cylinder , and the entire length of each of the sleeves is
, And the end of each of the sleeves
Tables that are aligned with at least a gap in the longitudinal direction
And forming the path shape or uneven, in which the outer flange portion of said sleeve so that said sleeve can be replaced with respect to the outer cylinder coupled removably to the outer cylinder.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a vertical sectional view of a vertical screw conveyor according to an embodiment of the present invention. Inside the outer cylinder 3 divided into a plurality
A screw shaft 1 having a screw blade 2 substantially concentric with the outer cylinder 3 is rotatably supported via an upper bearing 11 and a lower bearing 13, and a drive motor 9 provided at an upper end of the outer cylinder 3. Is driven to rotate. Reference numeral 10 denotes a shaft coupling between the screw shaft 1 and the drive motor 9. The rotation of the screw shaft 1 allows the granular material inlet 1 at the lower end of the outer cylinder 3
The granular material is taken in from 4, and is conveyed by a screw blade, and is transferred from the discharge port 12 at the upper end to another conveyor (not shown). As shown, the outer cylinder 3 is divided into a plurality of pieces in the length direction, and outer flange portions 15 for connection are formed at both ends thereof.

In each of the outer cylinders 3, a cylindrical sleeve having an outer flange portion 5 a at an end so as to be in contact with the inner surface of the outer cylinder 3 is provided .
Leaves 5 are inserted from both ends of the outer cylinder 3. Each scan <br/> sleeve 5 is formed to a length substantially half to the entire length of the outer tube 3
The outer flange portions 5a at the ends of the sleeves 5 are provided so as to be in contact with the outer flange portions 15 of the outer cylinders 3, and are fixed by bolts 16 penetrating the outer flange portions 15. When the screw shaft 1 is long as shown in FIGS. 1 and 5, an intermediate portion of the screw shaft 1 is supported by an intermediate bearing 7, and the intermediate bearing 7 is supported via a bracket 6 which projects radially. It is supported by a ring 6a.
The support ring 6a is sandwiched between the outer flange portions 15 and 5a of the outer cylinder 3 and the sleeve 5, and these outer flange portions 1 and 5a.
It is fixed by bolts 16 together with 5, 5a. The other end of the sleeve 5 inserted into each of the divided outer cylinders 3 is elongated.
They are aligned with a certain gap in the direction. Three here
The gap t between the ends of the sleeve 5
Working error, elongation due to thermal deformation of the sleeve 5, and
It is determined in consideration of the degree of intrusion and the like. The interval of this gap t
When the size of the conveyed material becomes large,
3 may be worn out, or powder particles may enter between the outer cylinder 3 and the sleeve 5.
And the replacement of the sleeve 3 is hindered.
To solve this inconvenience, push the end of the sleeve 3
3 and 4 as shown in FIGS.
It is formed so that it can be formed. 3 and 4 show the portion C in FIG.
And an enlarged view of the matching portion of the sleeve end in FIG. 2 is a partial sectional view showing an example of the matching form of a sleeve and the other end portion to each other of the foregoing, the other end 5b of the sleeve 3 as shown in FIG. 3 Are formed in a tapered shape that matches each other, or are formed so as to match each other in an uneven shape as shown in FIG. In addition, an arbitrary engagement mode is adopted so that the conveyed powder or granular material is not sandwiched in the alignment portion of the sleeve 5. As shown in FIG.
When the other end 5b of the sleeve 5 is tapered,
The gap between the tapered surfaces of the other end 5b is larger than the gap between the probes 5
Becomes narrower, and it becomes difficult for the granular material to enter between the tapered surfaces.
In addition, if it is made uneven, the longitudinal direction between the ends of the sleeve 5
Even if the distance changes, the distance between the uneven portions on the peripheral surface of the sleeve 5
Since the distance does not change, the powder and granules pass through the uneven part
Is less. As described above, the sleeve 5 is housed in the outer cylinder 3.
Sleeve 5 and outer cylinder for easy insertion or removal
3 must be provided. However
With such a gap, the sleeve 5 has an outer cylinder only at one end.
3, the torque of the screw blade 2 is
It is transmitted to the sleeve 5 through the granular material, and the sleeve 5 is
Twist in the direction. However, in the present invention, the sleeve 5
Since the total length is approximately half the length of the outer cylinder 3,
The circumferential twist of the leave 5 is reduced.

When the inner surface of the sleeve 5 is worn due to the transport of the granular material by the rotation of the screw blade 2, the bolt 1 holding the outer cylinder 3 and the outer flange portions 15 and 5a of the sleeve 5 is used.
6 is removed, the sleeve 5 is removed from the outer cylinder 3 and replaced with a new sleeve, and the outer cylinder 3 is assembled again with the bolts 16. The sleeve 5 to be replaced may be only the worn one, and an inspection part 8 is provided on the side of the outer cylinder 3 and the sleeve 5 to check the worn state from the outside. The inspection unit 8 will be described with reference to FIGS. 1, 2, 6, and 7. Inspection holes 17 and 18 are formed in the outer cylinder 3 and the sleeve 5 so as to be aligned with each other.
Inspection holes 17 and 18 are formed on the outer portion of
An openable and closable inspection lid 19 is closed by a hinge. Inside the inspection lid 19, a sleeve piece 20 that fits into the inspection hole 18 of the sleeve 5 when the lid is closed and matches the inner peripheral surface of the sleeve 5, and an outer cylinder that fits into the inspection hole 17 of the outer cylinder 3. Piece 2
1 is attached. The outer cylinder 3 and the inspection lid 19 are provided with a known lock mechanism 22 for fixing the inspection lid 19 in a lid closed state. If the inspection cover 19 is opened before, after, or during operation, the degree of wear of the inner surface of the sleeve can be observed from the inspection holes 17 and 18. The sleeve piece 20 inside the inspection lid is the outer cylinder piece 2
When the sleeve 20 is worn by the operation of the screw conveyor, this portion is replaced. An appropriate number of inspection parts 8 are provided in the axial direction of the outer cylinder 3, and from this inspection part 8, it is possible to observe not only the wear of the sleeve 5 but also the damage state of the screw blades, the adhesion state of the granular material, and the state inside the conveyor. . In the embodiment, the vertical screw conveyor has been described, but it is needless to say that the present invention can be similarly applied to a horizontal screw conveyor.

[0009]

As described above, according to the present invention, the outer flange is provided at one end from both ends of the outer cylinder to the inner surface of the outer cylinder.
2 having a length of approximately half the length of the outer cylinder.
Insert this sleeve, with a portion of the outer flange portion is bolted to the outer tube, etc. opposed ends of each sleeve
We adjusted the pusher so that it had a gap in the longitudinal direction
In, and sleeve co-around by the rotation of the screw blade screw
Or cause a record, without causing the positional deviation, the calling of running
The elongation of the sleeve inside the outer cylinder due to heat etc.
The wear state can be easily observed by opening the inspection lid, and when the wear has increased to a certain degree, it can be easily dealt with by replacing the sleeve only by removing the bolt on the outer flange, and the outer cylinder itself is a strength member There is an effect that the use can be continued as it is.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a vertical screw conveyor according to an embodiment of the present invention.

FIG. 2 is a side view of the sleeve according to the embodiment of the present invention, partially cut away;

FIG. 3 is a partial vertical sectional view showing an example of the shape of a joint end of a sleeve.

FIG. 4 is a partial longitudinal sectional view showing another example of the shape of the joint end of the sleeve.

FIG. 5 is an enlarged cross-sectional view taken along line AA of FIG. 1;

FIG. 6 is an enlarged cross-sectional view taken along the line BB of FIG. 1;

FIG. 7 is a partially enlarged side view as viewed from an arrow F in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 screw shaft 2 screw blade 3 outer cylinder 5 sleeve 5 a outer flange of sleeve 5 b other end of sleeve 8 inspection section 15 outer flange of outer cylinder 17 inspection hole 18 inspection hole 19 inspection lid 20 sleeve piece

Claims (2)

(57) [Scope of request for utility model registration] 1. A screw conveyor in which screw blades are rotatably provided inside an outer cylinder.
Te inserted into the outer tube inner surface two cylindrical sleeve having an outer flange portion from both ends of the outer cylinder at one end, the total length of said sleeve each form a length of approximately half of the outer cylinder ,Before
Clear the ends of each sleeve at least in the longitudinal direction.
To form a tapered or uneven shape that matches each other
Together, screw conveyor, characterized in that the outer flange of the sleeve so that the sleeve can be replaced with respect to the outer cylinder coupled removably to the outer cylinder. 2. The apparatus according to claim 2, wherein said two cylindrical sleeves are inserted.
Take a plurality of outer cylinders together with the cylindrical sleeve in the longitudinal direction.
Claim 1 characterized by the fact that they are detachably connected.
Screw conveyor as described.