JP2016040207A - Chute - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chute of which an abrasion resistance is increased and a long service life is achieved.SOLUTION: A chute 1 so installed as to be inclined downwards a conveyor for conveying an object to be conveyed is provided with retaining means 10, which retains a part of the object to be conveyed dropping from the conveyor, on a slide surface of the chute 1. The retaining means 10 comprises a retention part 11 which is formed in a lattice shape by combining plural vertical rails 12 extending in a longer direction of the chute 1 with plural horizontal rails 13 extending in a width direction of the chute 1, and sliding part 16 which slides the object to be conveyed to the front of the retention part 11. The retaining means 10 is fixed to a bottom plate 2 of the chute 1 so that the object to be conveyed is transferred from the sliding part 16 to the chute 1 while slidingly moving. Since the object to be conveyed discharged from the retention part 11 is transferred from the sliding part 16 to the chute 1 while slidingly moving, an impact is not at all given onto the chute 1, and therefore, a repair frequency can be reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chute. Conveying equipment such as belt conveyors is widely used for transporting objects to be transported, and when transferring multiple transporting equipment, a chute is used as a connection between the previous transporting equipment and the next transporting equipment. Is generally used. The present invention relates to such a chute.

  It is provided at the end of a conveyor facility such as a belt conveyor, receives the object to be transported, slides it, supplies the object to the leading end of the next conveyor equipment, and then transports the object from the previous transport facility to the next A chute for transferring a transported object is likely to be deformed or damaged due to continuous sliding contact with the transported object or wear due to collision.

  A chute used in a low-grade Ni ore smelting plant will be described as an example. In the process of producing ore slurry, Ni ore, which is the raw material, is classified step by step in the middle of transportation, and the undersized ore (accepted product) is repulped and then sent to the HPAL process, which is the next process, as a slurry. Oversized (unusable) ore including rocks are discharged out of the process by a dedicated conveyor. Oversize (unusable) ore discharged from the classification equipment is transported by multiple belt conveyors and discharged out of the process (stock yard), but a chute is installed to transfer the multiple belt conveyors. Yes.

  Usually, the object to be conveyed is conveyed by sliding the sliding surface of the chute, and the sliding surface of the chute has a flat shape so as to be hardly caught. Further, as a material for the chute, it is mainly made of an iron-based material at a low cost.

  However, the chute installed while moving to the stock yard via multiple belt conveyors and classifiers may repeatedly receive localized impacts of blocks containing ores and rocks. The chutes used in the above are damaged, deformed and worn quickly and are frequently repaired.

  The repair method is usually the case where the contact plate or deformed part by electric welding is cut with a gas cutting machine, and a new plate is fitted and welded according to the cut shape, but when wear progresses, the plate thickness decreases. Due to lack of strength, the repaired part may be damaged again in a short time, and when the deformation progresses, a lump etc. is caught in the deformed part, so that it stays or accumulates in the chute and eventually the chute is blocked. It may cause new troubles.

  In particular, the problem of operation is that repairs to recover the damage, deformation, wear, etc. that cause it often involve unscheduled operation stoppages. For example, in the periodic inspection and repair that is performed about once every six months, the operation stop is planned in advance, and the inspection and repair are carried out during that period, so the influence on the operation plan is small. However, if a situation that requires repair (sometimes referred to as sudden repair) occurs during the period of continuous operation planning, that is, the period between the previous periodic inspection and the next periodic inspection, It will adversely affect the operation plan.

  For this reason, it is necessary to suppress breakage, deformation, and wear of the chute (hereinafter sometimes referred to simply as “chute malfunction”). Suppressing sudden repairs is important for achieving the operation plan.

  By the way, the techniques for improving the wear resistance and impact resistance of the chute that are actually used are generally (1) a method of attaching a plate (sacrificial plate) to the worn portion of the chute, and (2) an abrasion resistant material. And (3) a method of attaching a cushioning material to improve impact resistance. However, these methods have the following problems.

(1) Problems with pasting the sacrificial plate The method of pasting the sacrificial plate on the chute is a method of attaching a sacrificial plate with the same material and thickness as the chute by welding. It is.
Although it is a widely used method, the thickness of the plate does not affect the strength of the chute even if the plate thickness is increased to extend the life because the material is not wear resistant (equivalent to the thickness of the chute material). In general, even if the thickness is increased somewhat, it will be consumed in several months, and re-repair is required. Thus, since the effect is limited, there is a problem that it is difficult to suppress sudden repair in the same means.

(2) Problems associated with attaching a wear-resistant material A variety of wear-resistant materials are already available on the market and are relatively easy to select and obtain. Can be selected.
However, most of these wear-resistant materials are specialized for fluid wear and repeated wear with little impact, as represented by ceramic, hardened overlay, ultra-high molecular weight polyethylene, etc. Most of these wear-resistant materials are fragile, and many hardened parts are damaged by the impact or are only consumed.
For example, in order to suppress sudden repairs, a material that has both wear resistance and impact resistance is expensive, and it is difficult to apply and maintain this chute from the viewpoint of cost effectiveness. There is a problem that there is.

(3) Problems associated with attaching cushioning materials Although cushioning materials are mainly represented by rubber-based materials, as with wear-resistant materials, materials with various properties are on the market and are selected in a wide variety. It is relatively easy to obtain and inexpensive ones can be selected.
However, if the fall energy is absorbed by buffering the impact, the block stays on the chute and may cause a blockage trouble. In addition, those with weak wear resistance are likely to be damaged and worn out and consumed in about one to two months, and the chutes may accumulate or accumulate at locations that have been torn due to wear, and the chute is likely to become clogged.
Since the effect of wear resistance is limited in the same manner as that of the sacrificial plate, there is a problem that it is difficult to obtain further effects in the same means.

Further, techniques for improving the wear resistance and impact resistance of the chute described in the literature include the following.
(4) In Japanese Patent Laid-Open No. 11-061213 (Patent Document 1), there is a technique similar to the above (2) using a wear-resistant material in order to extend the life of the chute member worn by the collision of the conveyed object. Have been described. However, since this is a swivel chute for a blast furnace and is a technique applied to the repulsion member at the tip, it is difficult to apply and has the same problem as the above (2).

(5) Non-patent document “Theory and Calculation Belt conveyor (Engineering Books Co., Ltd .: April 15, 1980, 4th edition) (Non-patent document 1) includes a conveyed object to prevent wear of the chute. Techniques for providing pockets in which objects are retained are described.
In this prior art, as shown in FIG. 4, a chute 100 is provided for dropping an object to be conveyed g from an upper belt conveyor 101 to a lower belt conveyor 102. It is a cylindrical structure that guides the fall. And the pocket 110 which stores the to-be-conveyed object g is formed in a part of chute | shoot 100 which is a cylindrical structure. 4A shows a case where a pocket 110 is provided in front of the chute 100 in the conveying direction of the upper conveyor 101, and FIG. 4B shows that the chute 100 is provided behind the conveying direction of the upper conveyor 101.
In this chute 100, the object to be conveyed retained in the pocket 110 is used as a buffer material, and the slope formed by the accumulated object to be retained is used as the chute sliding surface.

However, in the prior art (5), since the size of the chute 100 is increased both in the vertical direction and in the width direction in order to provide the pocket 110, there is a problem that installation is limited.
In addition, the object to be conveyed that is retained in the pocket 110 to form a slope is likely to be replaced with the conveyed object to be supplied, and in particular, the upper end portion ((A) of FIG. 4) or the lower end portion of the accumulated object slope. In the specific part ((B) of FIG. 4), there is a problem that the wear of the wall surface of the chute 100 proceeds.

Japanese Patent Laid-Open No. 11-061213

"Theory and Calculation Belt Conveyor (Engineering Books Co., Ltd.)" April 15, 1980, 4th edition p. 132 Figure 6.11 (Special chute (3))

  In view of the above circumstances, an object of the present invention is to provide a chute that has improved wear resistance and wear resistance and has achieved a long life.

The chute according to the first aspect of the present invention is a chute (1) installed at an angle below a conveyor that conveys the object to be conveyed, and the object to be conveyed dropped from the conveyor on the sliding surface of the chute (1). A staying means (10) for retaining a part of the chute (1) is provided, and the staying means includes a plurality of vertical bars (12) extending in the longitudinal direction of the chute (1) and a plurality of horizontal bars extending in the width direction. (13) and a storage part (11) formed in a lattice shape, and a sliding part (16) for sliding the object to be transported in front of the storage part (11). The staying means (10) is fixed to the bottom plate (2) of the chute (1) so as to move while sliding on the chute (1) from the sliding part (16).
The chute of the second invention is characterized in that, in the first invention, the reservoir (11) is fixed on a bottom plate (14) different from the bottom plate (2).

  According to the present invention, since the staying means (10) has a lattice shape, an appropriate amount of the object to be transported that has fallen from the conveyor can be stored, and can be held so as not to fall down. There is not much change. Further, since the object to be transported discharged from the storage part (11) slides from the sliding part (16) to the chute (1) and moves, no impact is applied to the chute (1). For this reason, the staying material itself functions as a sacrificial cushioning material for a long period of time, and it is possible to prevent a wear damage portion from being generated on the chute (1). This reduces the frequency of repairs.

It is a perspective view of the chute concerning a 1st embodiment of the present invention. It is a side view of the chute | shoot of FIG. It is a perspective view of a chute concerning a 2nd embodiment of the present invention. It is explanatory drawing of the conventional chute.

Next, an embodiment of the present invention will be described with reference to the drawings.
The chute of the present invention can be used in all industrial fields, but in the following, the explanation will be made by taking a Ni ore transport chute as an example.
In the following embodiment, Ni ore lump, grain, fine powder, or a mixture thereof can be exemplified as the transported object g. In particular, it is sometimes expressed as a lump.

(First embodiment)
1 and 2, 1 is a chute and 50 is a conveyor. The chute 1 is installed at an angle below the tip of the conveyor 50 that conveys the object to be conveyed. The chute 1 is a chute having a known structure having a bottom plate 2 and side plates 3 and 3 rising from both side edges. The upper surface of the bottom plate 2 of the chute 1 is a sliding surface 2a.

The chute 1 of the present embodiment is provided with a staying means 10 for retaining a part of the transported object g falling from the conveyor 50 on the sliding surface 2a.
The staying means 10 includes a storage part 11 and a sliding part 16. The storage section 11 is formed in a lattice shape by combining a plurality of vertical bars 12 extending in the longitudinal direction of the chute 1 and a plurality of horizontal bars 13 extending in the width direction. In addition, the storage unit 11 is fixed on the bottom plate 14 and joined and integrated by left and right side plates 15 and 15.

  The sliding part 16 is provided in front of the storage part 11. This front means the downstream side in the direction in which the transported object g is sent while rolling. The sliding portion 16 is composed of a bottom plate 14 without using a horizontal rail. That is, the transported object g is configured to easily roll or slide forward. In addition, the bottom plate 14 and the side plate 15 use what extended the thing of the storage part 11 ahead.

  What is necessary is just to select the width | variety and length of the retention means 10 suitably according to use conditions. The width of the staying means 10 may be the same as the belt width of the conveyor 50 or about 1.2 to 1.3 times in consideration of the meandering of the belt. In this case, even if the transported object g such as a lump falls, it can be sufficiently accommodated. The length of the staying means 10 may be determined from the range in which the lump falls. The fall range can be determined from the belt speed of the conveyor and the angle θ of the chute.

The staying means 10 is detachably attached to the bottom plate 2 of the chute 1 via a fixture 17. As the fixture 17, a known member such as a bolt and a nut using a L-shaped metal fitting in a side view is used without particular limitation.
Instead of bolts and nuts, a bracket having an appropriate shape may be welded and fixed on the chute 1. Bolt connection as well as welding can be fused, so replacement at the time of aging is easy. In addition, since the staying means 10 is an integral part and is detachably attached to the chute 1, it can be removed and attached with less man-hours for maintenance work.

  The size of the cage composed of the vertical beam 12 and the horizontal beam 13 in the storage unit 11 is suitably about 150 mm to 200 mm in height and width and about 50 mm to 70 mm in height according to the properties of the Ni ore. It is not restricted to the dimension of. If the object to be transported g is other than Ni ore, a material that is smaller or larger than the size of the soot may be used as appropriate.

  Although there is no restriction | limiting in particular in the material of the material which comprises the staying means 10, If it is the same material as the chute | shoot 1, since acquisition and a process become easy, it is preferable. The plate thickness of the vertical beam 12 or the horizontal beam 13 is not particularly limited, but if it is around 16 mm, it is difficult to cause damage due to collision with a lump, and the internal space of the bag can be sufficiently secured.

  As shown in FIG. 2, when the storage part 11 of the staying means 10 has a lattice shape, the transported object g is a lump, a granule, a fine powder, or a mixture of these because the four sides of the basket are surrounded. However, it can stay in the cage of the lattice and function as a sacrificial cushioning material. In other words, during operation, a part of the transported object g that has fallen from the conveyor 50 can be stored and held so as not to slide down, so that the stayed material g that has once retained does not change much. For this reason, the function as a sacrificial buffer material can be exhibited reliably over a long period of time.

  As described above, if lumps, grains, and fine powder are always retained in the storage unit 11, when the lump falling from the conveyor 50 collides with the lump, grains, and fine powder, the collision energy is absorbed and the surplus. It is discharged forward by the kinetic energy. In this way, since there is no direct collision with the chute 1, wear of the chute 1 is suppressed.

  In addition, the transported object g discharged from the storage unit 11 is not suddenly discharged to the chute 1 but rolls down to the sliding unit 16 and moves to the chute 1 while sliding and moving there. For this reason, no impact is applied to the chute 1.

(Second Embodiment)
In the second embodiment shown in FIG. 3, the chute 1 itself has a bowl shape that is curved in a front view, and accordingly, the staying means 20 is also configured to have a curved lower edge. Further, the staying means 20 includes a storage part 21 and a sliding part 26. The storage unit 21 is integrated by connecting a plurality of horizontal bars 23 to a bottom plate 24. More specifically, the storage unit 21 is configured by using a plurality of horizontal bars 23 extending in the width direction of the chute 1 and installing the plurality of horizontal bars 23 at intervals in the longitudinal direction of the chute 1. And each horizontal rail 23 is comprised with the board | plate material in which the lower edge curved.

The sliding part 26 is comprised by the baseplate 24, and the crosspiece is not used. That is, the conveyed object g is easy to slide and move.
The four horizontal rails 23 are also fixed to the left and right side plates 25, 25. However, when the height of the horizontal rail 23 is low, a structure in which the horizontal rail 23 is fixed to the bottom plate 24 without using the side plate 25 may be used.

  In the present embodiment, the staying means 20 has a shape in which the lower edge is curved. However, as described above, since this is matched with the curved shape of the chute 1, it may be configured to have the same curved radius. Further, although no vertical rail is used, such a structure can also be used depending on the properties of the conveyed object g. For example, when the lump that is the transported object g is small, the rigidity of the storage unit 21 is sufficient even without a vertical rail. However, it is of course possible to adopt a structure using vertical bars.

  Also in the second embodiment, the staying means 20 is detachably attached to the chute 1 via a fitting 27 such as welding or a bolt / nut via an appropriate bracket.

  Also in the present embodiment, since the horizontal rail 23 exists so as to extend in the width direction of the chute 1, it is possible to store a part of the transported object g that has dropped from the conveyor and to prevent the sliding from occurring. , There is not much replacement of the accumulated material once retained. For this reason, the function as a sacrificial buffer material can be exhibited reliably over a long period of time. Further, since the staying means 20 is an integral part and is detachably attached to the chute 1, it can be removed and attached with less man-hours for maintenance work.

(Other embodiments)
In the present invention, the shape of the reservoirs 11 and 21 in the staying means 10 and 20 is not limited to the above embodiment. An appropriate shape other than a lattice shape or a shelf shape can be adopted according to the shape, properties, hardness, etc. of the conveyed object g. In short, it suffices if a certain amount of the object to be transported g can be retained and function as a sacrificial cushioning material.

  As described above, in each embodiment of the present invention, the transported object g dropped from the conveyor stays in the staying means 10, and the staying thing itself functions as a sacrificial cushioning material, so that the chute 1 is less damaged and repaired. Less frequent.

DESCRIPTION OF SYMBOLS 1 Chute 10 Retaining means 11 Retaining part 12 Vertical beam 13 Horizontal beam 14 Side plate 16 Sliding part 20 Retaining part 21 Retaining part 23 Horizontal beam 24 Bottom plate 25 Side plate 26 Sliding part

Claims (2)

A chute (1) installed at an angle below the conveyor for conveying the object to be conveyed,
On the sliding surface of the chute (1), there is provided a staying means (10) for retaining a part of the object to be transported falling from the conveyor,
The retaining means (11) is a storage portion (11) formed in a lattice by combining a plurality of vertical bars (12) extending in the longitudinal direction of the chute (1) and a plurality of horizontal bars (13) extending in the width direction. ) And a sliding part (16) for sliding the object to be conveyed in front of the storage part (11),
The staying means (10) is fixed to the bottom plate (2) of the chute (1) so that the object to be conveyed is transferred from the sliding part (16) to the chute (1) while moving. A shoot characterized by. The chute according to claim 1, wherein the storage part (11) is fixed on a bottom plate (14) different from the bottom plate (2).

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