JP4321924B2 - Screw conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw conveyor used for conveying powder or sludge.
[0002]
[Prior art]
Conventionally, as this type of screw conveyor, in order to prevent the occurrence of bending at approximately the center in the longitudinal direction of the screw, one that supports the screw at approximately the center in the longitudinal direction is known (for example, Akira Akira). 57-23718). In this device, an auxiliary shaft is disposed outside a casing such as a trough or a pipe in parallel with the screw shaft. A shaft is supported between the auxiliary shaft and the screw shaft so as to support the screw shaft.
[0003]
[Problems to be solved by the invention]
However, the conventional screw conveyor requires a large space for disposing the auxiliary shaft on the outside of the casing, and there is a disadvantage that it may be difficult to install the screw conveyor. Further, for example, in a screw conveyor in which a pair of screws are orthogonally arranged so as to have a T-shaped or L-shaped conveyance path, an auxiliary shaft is provided outside the casing at the coupling portion. There is an inconvenience that cannot be done.
[0004]
In view of this, there is known one that supports a screw by filling the gap between the outer peripheral edge of the screw blade and the inner peripheral surface of the casing so that the screw is rotatably mounted on the casing. For example, in Japanese Utility Model Laid-Open No. 56-116316, a U-shaped notch is provided in the outer peripheral portion of a screw blade, and a roller disposed in the notch is caused to roll on the inner peripheral surface of the casing. Are listed. Japanese Utility Model Laid-Open No. 58-180812 discloses a technique for attaching and fixing a deflection preventing piece located between the outer peripheral surface of the screw blade and the inner peripheral surface of the casing to the screw blade or the casing. Yes.
[0005]
However, if the roller is provided, the structure becomes complicated, and there is a disadvantage that the manufacturing cost increases.
[0006]
Further, if the anti-bending piece is provided, the anti-bending piece and the screw blade, or the anti-bending piece and the inner peripheral surface of the casing rub against each other, so that the anti-bending piece is worn. There is an inconvenience. In addition, the deflection preventing piece and the screw blade, or the deflection preventing piece and the casing inner peripheral surface rub against each other with a very narrow contact area, so that there is a disadvantage that wear becomes extremely intense. Furthermore, if the anti-bending piece is worn, it is necessary to replace the anti-bending piece. However, since the anti-bending piece is formed in a special arc shape, its manufacturing cost increases. In addition, there is a disadvantage in that the replacement work of the deflection preventing piece becomes complicated due to its structure.
[0007]
That is, the conventional screw conveyor in which the screw as described above is rotatably mounted on the casing has many disadvantages such as an increase in manufacturing cost and difficulty in maintenance.
[0008]
The present invention has been made in view of such circumstances. The object of the present invention is to reliably support the shaft of the screw conveyor while saving space, and to reduce the manufacturing cost and maintain it. It is to make it easier.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor has focused on the point that a contact member that comes into surface contact with the inner peripheral surface of the casing is attached to the outer peripheral edge of the screw blade. Then, the present invention has been completed in view of the point that the structure for attaching the contact member is a structure that can be easily replaced.
[0010]
Specifically, the present invention includes a screw shaft, a screw constituted by a screw blade wound around the screw shaft, and a casing that accommodates the screw. Then, the above-mentioned screw blade, perpendicular to the blade surface of the screw blade of this, the mounting portion having a predetermined width, mounted along the outer edge of the screw blade, a strip-shaped contact member, and the mounting portion It attaches along the said attachment part between casing inner peripheral surfaces, and makes it the specific matter to make the said contact member contact | abut to the said casing inner peripheral surface by surface contact . Here, the “casing” may be, for example, a trough having a U-shaped cross section or a pipe. The “contact member” is preferably formed of, for example, a self-lubricating and wear-resistant sliding material, such as an ultra-high molecular weight polymer plastic resin, such as UHMW-NA or MC. What is necessary is just to form with nylon etc.
[0011]
In this case, the contact member comes into contact with the inner peripheral surface of the casing, and the screw is placed on the casing so as to be rotatable around its axis, and the screw is supported on the shaft. For this reason, the space outside a casing is not required but space saving is achieved.
[0012]
Moreover, the attachment part may be attached, for example, along the outer peripheral edge of the screw blades, and the contact member may be attached along the attachment part. The structure is extremely simple, and the manufacturing cost can be reduced.
[0013]
Further, since the contact member contacts the casing with the width of the strip, that is, the surface contact with the casing, the contact pressure is reduced, and wear of the contact member is reduced. .
[0014]
Even when the contact member is worn, the contact member is attached along the outer peripheral edge of the screw blade, so that only the contact member can be easily removed from the attachment portion. This is possible and facilitates replacement work.
[0015]
In addition, since the abutting member is simply formed in a band plate shape, the cost required for the replacement can be greatly reduced.
[0016]
By the way, when the “attachment portion” is attached so as to protrude from the blade surface on the conveyance direction side of the screw blade, for example, to the conveyance direction side, the conveyed object is in contact with the blade surface, the attachment portion, and the contact surface. There is a possibility of depositing on a step portion formed by the member.
[0017]
Therefore, the attachment portion may be attached so as to expand only from the outer peripheral edge of the screw blade in the direction opposite to the conveying direction. In this case, since the blade surface in the conveying direction of the screw blade is flat, accumulation of the conveyed product is reliably prevented, and the conveyed product can be reliably conveyed.
[0018]
Such a screw conveyor is formed, for example, by connecting a plurality of screw units so as to be coaxial with each other, and the mounting portion and the abutting member are formed in the longitudinal direction of the screw. You may make it provide in the screw unit arrange | positioned in the direction approximate center. Here, in the “screw unit”, for example, a male joint protruding from the end face is provided at the end of one screw unit, while the end of the other screw unit is recessed from the end face. A female joint may be provided. And you may make it connect both by fitting the said male joint in a female joint.
[0019]
In this case, for example, if a long screw is used, the conveyance and installation can be easily performed by configuring the screw so that the conveyance and installation are difficult. In addition, by providing the attachment portion and the contact member in the screw unit positioned at the approximate center in the longitudinal direction of the screw, the shaft support of the approximately central portion of the screw where the maximum deflection occurs can be reliably and effectively performed.
[0020]
Further, as such a screw conveyor, the screws may be arranged in a straight line and the conveyance path may be formed in a straight line. For example, as in claim 3, the pair of screws are orthogonal to each other. The conveyance path may be formed in a T shape or an L shape. In this case, even in a portion where the auxiliary shaft cannot be provided outside the casing, for example, a portion where the casing is coupled, the shaft can be reliably supported by the contact member.
[0021]
Further, as the screw conveyor, for example, as in claim 4, any of screws arranged in a horizontal direction, a vertical direction, or inclined may be used.
[0022]
【The invention's effect】
As described above, according to the screw conveyor of the present invention, it is possible to reliably support the shaft of the screw while saving space.
[0023]
In addition, the manufacturing cost can be reduced with a simple structure, and by bringing the contact member into surface contact with the inner peripheral surface of the casing, wear of the contact member can be reduced and durability can be improved. Furthermore, when wear of the contact member occurs, it is possible to easily replace only the contact member. For this reason, the maintenance can be simplified and the cost can be reduced.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 shows an overall schematic view of a screw conveyor 1 according to an embodiment of the present invention. The screw conveyor 1 is a trough 31 as a casing formed in a substantially U-shaped cross section, and is accommodated in the trough 31. The screw 2 whose both ends are rotatably supported by bearings 33, 33, a lid 32 disposed at the upper end opening of the trough 31 and sealing the opening, and a drive chain at the other end of the screw 2 37 and a drive motor 36 connected by 37. Then, when the drive motor 36 is driven, the screw 2 rotates, transports the transported material introduced from the insertion port 34 provided on one end side of the trough 31, and the discharge port provided on the other end side. 35 (see the arrow in the figure).
[0026]
The screw 2 is formed by connecting a plurality of screw units 21, 21,... So as to be coaxial with each other.
[0027]
As shown in FIG. 2, the screw unit 21 includes a screw shaft 21a and screw blades 21b wound in a spiral shape in the longitudinal direction of the screw shaft 21a.
[0028]
An attachment portion 22a extending from the outer periphery of the screw blade 21b in the longitudinal direction of the screw shaft 21a is attached so as to be orthogonal to the blade surfaces 21c and 21d of the screw blade 21b. That is, the band plate-shaped attachment portion 22a is attached along the outer peripheral edge of the screw blade 21b.
[0029]
As shown in FIGS. 2 to 4, a band plate-like contact member 22b is disposed on the mounting portion 22a along the peripheral surface of the mounting portion 22a. As shown in FIG. 3, the abutting member 22b fastens a countersunk bolt 22d and nut 22e inserted into mounting holes 22g and 22f formed in the attaching portion 22a and the abutting member 22b, respectively. By doing so, it is fixed to the attachment portion 22a. The contact member 22b is positioned between the mounting portion 22a and the inner peripheral surface of the trough 31, and the outer peripheral surface of the contact member 22b is in contact with the inner peripheral surface of the trough 31. It is the contact surface 22c (refer FIG. 3 or FIG. 4). Here, as shown in FIG. 3, the attachment hole 22f provided in the abutting member 22b is a hole so that the head of the countersunk bolt 22d can be inserted, thereby the countersunk bolt 22d. The head is not projected on the contact surface 22c.
[0030]
As shown in FIG. 3, the attachment portion 22a and the contact member 22b are attached so as to extend from the outer peripheral edge of the screw blade 21b in the direction opposite to the conveyance direction, and the screw blade 21b is in the conveyance direction side. The blade surface 21d is flat. For this reason, the conveyed product can be reliably conveyed without being accumulated on the conveying direction side of the screw blade 21b.
[0031]
As such a contact member 22b, any material having self-lubricating properties and wear resistance may be used, and for example, an ultrahigh molecular weight polymer plastic may be used. Specifically, it is preferable to use, for example, UHMW-NA or MC nylon.
[0032]
In addition, you may make it provide such an attaching part 22a and the contact member 22b over the whole longitudinal direction of the screw 2, for example, the screw located in a part of longitudinal direction of the said screw 2, for example in the longitudinal direction approximate center. It may be provided on the shaft 21.
[0033]
As shown in FIG. 2, a male joint 23a is formed on one end side of the screw unit 21 so as to protrude in the axial direction from the end face, while the other end side is recessed in the axial direction from the end face. A female joint 23b is formed. As shown in FIG. 4, the male joint 23a is formed in a hexagonal column shape whose cross section is formed in a regular hexagon, while the female joint 23b is configured so that the male joint 23a can be fitted therein. The cross-sectional shape of the hole is a regular hexagon.
[0034]
The male joint 23a of the other screw unit 21 is fitted into the female joint 23b of one screw unit 21, and the fixing holes 23c and 23d provided in the male joint 23a and the female joint 23b are not shown. By inserting the bolts or pins, the pair of screw units 21 and 21 are coupled and fixed in a state where the rotation about the axis can be transmitted. In this way, the screw 2 is formed.
[0035]
Thus, by forming the screw 2 by connecting a plurality of screw units 21 coaxially, even a long screw 2 can be easily conveyed and installed. .
[0036]
Next, the operation and effect of the above embodiment will be described.
[0037]
When the contact member 22b contacts the inner peripheral surface of the trough 31, the screw 2 is supported by the trough 31 in a rotatable state (see FIG. 3). For this reason, it is not necessary to provide an auxiliary shaft outside the trough 31, and space can be saved.
[0038]
Moreover, both the attachment part 22a and the contact member 22b may be band-plate-like members, and if these members 22a and 22b are attached along the outer peripheral edge of the screw blade 21b, the screw 2 The shaft can be supported. Since the structure is extremely simple as described above, the manufacturing cost can be greatly reduced.
[0039]
Furthermore, since the contact member 22b is in surface contact with the inner peripheral surface of the trough 31, the contact pressure is reduced and wear of the contact member 22b can be reduced. Further, even when the contact member 22b is worn, only the contact member 22b can be easily removed from the mounting portion 22a by removing the fastening between the countersunk bolt 22d and the nut 22e. Further, since the contact member 22b can be easily attached, the replacement work can be easily performed.
[0040]
In addition, since the contact member 22b is a band plate-like member, the cost can be greatly reduced even when the contact member 22b is replaced. For this reason, the cost required for maintenance can be greatly reduced.
<Other embodiments>
In addition, this invention is not limited to the said embodiment, Other various embodiment is included. That is, in the said embodiment, although the cross section of the male joint 23a provided in the edge part of the screw unit 21 and the female joint 23b is each formed in the regular hexagon, it is not restricted to this, For example, a triangle, a quadrangle, etc. You may form in the polygon.
[0041]
Further, as the male joint and the female joint, as shown in FIG. 5, for example, as a male joint provided on one end side of the screw shaft 41a, a key 43c is formed at one place of the round bar 43a. As a female joint provided on the other end side of 41a, a key groove 43d may be formed in the round hole 43b. The key 43c and the key groove 43d may be formed at a plurality of locations on the round bar 43a or the round hole 43b.
[0042]
Furthermore, as a structure of the connection part of the screw shaft 21, you may make it show, for example in FIG. 6 or FIG. That is, female joints 53a that are recessed from the end faces are provided at both ends of the screw shafts 51a and 51a. On the other hand, a connecting shaft 54 is prepared in which a round bar 54a on which a key 54b is formed is attached to both sides of a collar 54c. Then, both ends of the connecting shaft 54 are fitted into the circular holes 53c and the key grooves 53b formed in the female joints 53a and 53a, and fixed to connect the pair of screw shafts 51a and 51a. May be.
[0043]
In addition, as the screw conveyor 1, a pair of screws 2 and troughs 31 may be connected so as to be orthogonal to each other so as to have a conveying path in a T shape or an L shape, for example. In this case, the shaft of the screw 2 can be supported by the abutting member 22b even at the connecting portion.
[0044]
In addition, the screw conveyor 1 may be arranged vertically or inclined.
[Brief description of the drawings]
FIG. 1 is an overall view showing a screw conveyor.
FIG. 2 is a front view showing a screw unit.
FIG. 3 is an enlarged sectional view showing an outer peripheral edge portion of a screw blade.
FIG. 4 is a side view showing an end portion of the screw unit.
FIG. 5 is a perspective explanatory view showing a connecting portion of a screw unit according to another embodiment.
6 is a cross-sectional explanatory view showing a connecting portion of a screw unit different from FIG. 5. FIG.
7 is a cross-sectional view showing the AA cross section of FIG. 6. FIG.
[Explanation of symbols]
1 Screw conveyor 2 Screw 21 Screw unit 31 Trough (casing)
21a, 41a, 51a Screw shaft 21b Screw blade 21c Blade surface (opposite direction of conveyance)
21d Blade surface (conveyance direction side)
22a Mounting member 22b Contact member

Claims (4)

A screw shaft, a screw constituted by screw blades wound in a spiral shape along the screw shaft, and a casing for housing the screw;
In the screw blade, an attachment portion having a predetermined width orthogonal to the blade surface of the screw blade is attached along the outer peripheral edge of the screw blade ,
A strip-shaped contact member is attached along the attachment portion between the attachment portion and the casing inner peripheral surface, and the contact member contacts the casing inner peripheral surface by surface contact. A screw conveyor characterized by that. In claim 1,
A screw is formed by connecting a plurality of screw units so as to be coaxial with each other,
The screw conveyor, wherein the attachment portion and the abutting member are provided in a screw unit disposed substantially at the center in the longitudinal direction of the screw. In claim 1,
A screw conveyor characterized in that a pair of screws are arranged so as to be orthogonal to each other, and a conveying path is formed in a T shape or an L shape. In any one of Claims 1-3,
A screw conveyor, wherein the screws are arranged in a horizontal direction, a vertical direction, or inclined.

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