JP5987379B2 - Screw conveyor - Google Patents

Description

  The present invention relates to a screw conveyor. More specifically, the present invention relates to a screw conveyor that suppresses screw wear.

  In copper smelting, dried copper concentrate is stored in a dry mine, and a certain amount of copper concentrate in the dry mine is charged into a self-smelting furnace. Here, the copper concentrate is transported from the dry mine to the smelting furnace by a screw conveyor, and the copper concentrate in the dry mine is cut into a certain amount by the screw conveyor and transported to the auto smelting furnace. .

  When the screw wear of the screw conveyor progresses and the gap between the screw and the trough increases, a flushing phenomenon may occur. Here, the flushing phenomenon is a phenomenon in which powder contains air and erupts like a flood. When the flushing phenomenon occurs, the copper concentrate is ejected from the gap of the screw conveyor, so that the flow rate cannot be controlled. As a result, copper concentrate of a predetermined flow rate or more is charged into the self-melting smelting furnace, resulting in problems in the operation of the self-melting smelting furnace.

As a technique for suppressing the wear of the screw of the screw conveyor, a technique for applying hardening to the screw is known (for example, Patent Document 1). The technique described in Patent Document 1 is a technique for applying hardening to the outer periphery of the screw blade.
However, as shown in FIG. 3, if the hardened 113 is merely applied to the outer periphery of the screw blade 112, the conveying surface of the screw blade 112 is worn, resulting in a thin wall or a hole, and as a result In some cases, about 2/3 of the width is partially lost (portion a in FIG. 3). Thus, when the screw blade 112 is partially missing, a flushing phenomenon occurs.
Further, the rotating shaft 111 is also worn in a spiral shape, and when the wear progresses, the rotating shaft 111 may be cut and cannot be conveyed.

Japanese Utility Model Publication No. 7-13825

  An object of this invention is to provide the screw conveyor which suppressed the abrasion of the screw in view of the said situation.

A screw conveyor according to a first aspect of the present invention is a screw conveyor including a screw including a rotation shaft and screw blades provided on the outer periphery of the rotation shaft, and the outer periphery of the screw conveyor is continuously viewed from the cross section without a gap. The outer periphery hardening build-up wrapped in a U-shape is given, and the streaky transfer surface hardening build-up along the radial direction on the transfer surface of the screw blade is spaced 20 mm to 25 mm at the outer periphery of the screw blade. in the circumferential direction are facilities to the conveying surface hardfacing is characterized in that the end on the outer side is connected to the outer periphery hardfacing.
The screw conveyor of the second invention is the screw conveyor according to the first invention, wherein the conveying surface hardfacing is provided with an end on the inner peripheral side at a predetermined interval from a joint between the screw blade and the rotating shaft. It is characterized by.
A screw conveyor according to a third aspect of the present invention is a screw conveyor including a screw including a rotating shaft and screw blades provided on an outer periphery of the rotating shaft, and a line along a radial direction on a conveying surface of the screw blade. In the circumferential direction, streaky rotary shaft hardfacing along the axial direction is provided at predetermined intervals in the circumferential direction. It is characterized by being given.

According to the first invention, the conveying surface of the screw blade is hardened on the conveying surface , and the outer periphery of the screw blade is hardened on the outer periphery, so that the screw blade is partially lost due to wear. This can be suppressed. In addition, a streak-shaped conveying surface hardening is applied to the conveying surface of the screw blade, and an outer peripheral hardening is continuously applied to the outer periphery of the screw blade without a gap. Since the edge part of this is connected to the outer periphery hardening build-up, it can suppress that a screw blade | wing is distorted by welding.
According to the second aspect of the present invention, since the hardened conveying surface is provided at a predetermined interval from the joint between the screw blade and the rotating shaft, it is possible to suppress the screw blade from being distorted by welding.
According to the third aspect of the invention, since the rotary shaft is hardened on the outer peripheral surface of the rotary shaft , it is possible to prevent the rotary shaft from being cut due to wear. Moreover, since the rotating shaft hardening build-up is given in the shape of a line, it can suppress that a rotating shaft is distorted by welding.

It is sectional drawing of the screw conveyor which concerns on one Embodiment of this invention. It is the II-II arrow directional cross-sectional view in FIG. It is sectional drawing of the conventional screw conveyor.

Next, an embodiment of the present invention will be described with reference to the drawings.
Although the screw conveyor 1 which concerns on one Embodiment of this invention is especially suitable for conveying mineral powders, such as copper concentrate, the use is not limited and can convey various to-be-conveyed objects. . Below, it demonstrates as a to-be-conveyed object being a copper concentrate.

As shown in FIGS. 1 and 2, the screw conveyor 1 includes a screw 10 and a trough 20 that encloses the screw 10. The screw 10 includes a hollow rotary shaft 11 and screw blades 12 joined to the outer peripheral surface of the rotary shaft 11. These rotating shafts 11 and screw blades 12 are formed of a general rolled material.
In this embodiment, the rotating shaft 11 has a diameter of 267 mm and an outer periphery of 839 mm, and the screw blade 12 has a diameter of 483 mm and an outer periphery of 1517 mm. Moreover, the width | variety (distance from a junction part with the rotating shaft 11 to an outer periphery) of the screw blade | wing 12 is 108 mm.

  The screw 10 is rotated in the trough 20 by a driving device (not shown), and the copper concentrate loaded in the trough 20 is transported in the axial direction while being pushed by the screw blades 12. Generally, the rotation direction of the screw 10 is one direction (clockwise in FIG. 1), and the screw conveyor 1 conveys copper concentrate in one direction (left direction in FIG. 2). Therefore, one surface (left surface in FIG. 2) of the screw blade 12 is a surface that pushes and conveys the copper concentrate. In this specification, the surface that pushes and conveys the object to be conveyed is referred to as a conveyance surface. Since the conveying surface of the screw blade 12 rubs against the copper concentrate, it is more likely to be worn than the opposite surface (the right surface in FIG. 2).

  The screw blade 12 is provided with a hardening build-up 13 (hereinafter referred to as a peripheral hardening build-up 13) on the outer periphery thereof. The outer periphery hardening build-up 13 is applied in a U shape in cross section so as to wrap the outer periphery of the screw blade 12.

  Further, a streak-like hardened layer 14 (hereinafter referred to as a “carrying surface hardened member 14”) along the radial direction is applied to the conveying surface of the screw blade 12. Here, the conveyance surface hardening build-up 14 is given at predetermined intervals in the circumferential direction of the screw blade 12. It is preferable that the space | interval of this conveyance surface hardening build-up 14 shall be 20 mm-25 mm in the outer periphery of the screw blade 12.

  The transport surface curing build-up 14 has an outer peripheral end connected to the outer circumferential cured build-up 13, and an inner peripheral end is provided at a predetermined interval from the joint between the screw blade 12 and the rotary shaft 11. Yes. It is preferable that the distance between the end portion of the transport surface curing build-up 14 and the joint portion is 20 mm to 25 mm.

  Furthermore, the outer peripheral surface of the rotating shaft 11 is provided with a streak-like hardfacing 15 (hereinafter referred to as “rotating shaft hardening 15”) along the axial direction thereof. Here, the rotating shaft hardening build-up 15 is applied at predetermined intervals in the circumferential direction of the rotating shaft 11. It is preferable that the space | interval of this rotating shaft hardening build-up 15 shall be 25 mm-30 mm.

  As described above, since the outer periphery hardening build-up 13 is applied to the outer periphery of the screw blade 12, wear on the outer periphery of the screw blade 12 can be suppressed. Thereby, it can suppress that the clearance gap between the outer periphery of the screw blade | wing 12 and the trough 20 spreads, and the flushing phenomenon in which copper concentrate ejects from the clearance gap can be prevented.

  Moreover, since the conveyance surface hardening build-up 14 is given to the conveyance surface of the screw blade 12, it can suppress that the screw blade 12 is missing partially by wear. Thereby, the flushing phenomenon in which a copper concentrate ejects from the missing part of the screw blade 12 can be prevented.

Since the conveyance surface hardening build-up 14 is formed in a streak shape, the screw blade 12 formed of a rolled material can be prevented from being distorted by welding of the hardening build-up material.
By making the conveying surface hardening build-up 14 in a streak shape, the conveying surface of the screw blade 12 is partially exposed, but the protruding conveying surface hardening build-up 14 is worn before the exposed portion of the screw blade 12. The wear of the screw blade 12 can be suppressed.

Moreover, since the conveyance surface hardening build-up 14 is given at predetermined intervals from the junction part of the screw blade 12 and the rotating shaft 11, it can suppress that the screw blade 12 is distorted by welding of the hardening build-up material.
The vicinity of the joint is exposed on the conveying surface of the screw blade 12. However, the screw blade 12 has a property that the vicinity of the joint is less likely to be worn than the vicinity of the outer periphery thereof. This is presumably because the screw blade 12 pushes the copper concentrate present at the bottom of the trough 20, and therefore the friction with the copper concentrate is stronger near the outer periphery of the screw blade 12. Therefore, even if the vicinity of the joint portion of the conveying surface of the screw blade 12 is exposed, the abrasion of the screw blade 12 can be suppressed by the conveying surface hardening overlay 14 provided near the outer periphery.

  Moreover, since the rotating shaft hardening overlay 15 is given to the outer peripheral surface of the rotating shaft 11, it can suppress that the rotating shaft 11 is cut | disconnected by abrasion. Thereby, it can prevent that the rotating shaft 11 is cut | disconnected and it becomes impossible to convey.

Since the rotary shaft hardfacing 15 is formed in a streak shape, the rotary shaft 11 formed of a rolled material can be prevented from being distorted by welding of the hardfacing material.
Although the rotary shaft 11 is partially exposed by making the rotary shaft hard build 15 in a streak shape, the protruding rotary shaft hard build 15 is worn before the exposed portion of the rotary shaft 11. 11 wear can be suppressed.

As described above, since the wear of the screw 10 can be suppressed by the hardfacing 13, 14, and 15, the flushing phenomenon can be prevented, and the auto-smelting furnace can be operated stably.
Moreover, the service life of the screw 10 can be extended, and the maintainability of the screw conveyor 1 is improved.

DESCRIPTION OF SYMBOLS 1 Screw conveyor 10 Screw 11 Rotating shaft 12 Screw blade 13 Outer periphery hardening build-up 14 Conveyance surface hardening build-up 15 Rotating shaft hardening build-up 20 Trough

Claims (3)

A screw conveyor comprising a screw comprising a rotating shaft and screw blades provided on the outer periphery of the rotating shaft,
The screw blades are continuously hardened with an outer periphery that wraps the outer periphery in a U-shaped cross-sectional view without gaps,
Wherein the conveying surface of the screw blade, streaky conveying surface hardfacing along its radial direction, are facilities circumferentially 20mm~25mm intervals in the outer periphery of the screw vane,
The screw conveyor according to claim 1, wherein an end portion on an outer peripheral side of the transport surface hardening build-up is connected to the outer periphery hardening build-up. 2. The screw conveyor according to claim 1, wherein an end portion on an inner peripheral side of the transport surface hardening build-up is provided at a predetermined interval from a joint portion between the screw blade and the rotating shaft. A screw conveyor comprising a screw comprising a rotating shaft and screw blades provided on the outer periphery of the rotating shaft,
On the conveying surface of the screw blades, streaky conveying surface hardening build-up along the radial direction is applied at predetermined intervals in the circumferential direction,
Wherein the outer peripheral surface of the rotary shaft, streak-shaped rotary shaft hardfacing along its axial direction, characterized and to Luz clew conveyor that has been subjected at predetermined intervals in the circumferential direction.

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