JP6278919B2 - Roller screen - Google Patents

Description

  The present invention relates to a roller screen that sorts various objects to be processed according to their sizes.

  In general, in order to sort objects to be processed in which objects of different sizes are mixed, the objects to be processed are placed on rollers with a plurality of rings (rotors) that are driven to rotate. There is a sorter called a roller screen that performs a sorting operation by dropping into a gap formed between rollers while being sent to the discharge side by rotation of the ring.

  Examples of the object to be processed by the roller screen include ores such as coal, crushed stones, ore, other stone materials, construction waste materials, wood, earth and sand, and the like.

  These roller screens include a roller including a support shaft that rotates around an axis by a driving force from a drive source such as a motor, and a plurality of rings that are attached along the axial direction of the support shaft. A plurality of rollers are arranged in parallel along the feed direction of the workpiece. The rings provided on the support shafts of the adjacent rollers are at positions shifted from each other along the axial direction of the support shaft.

  The object to be processed is supplied onto the conveying surface of the roller screen, receives a force by the rotation of the ring, and moves from the supply side to the discharge side along the feeding direction. During the movement, those having a small outer shape fall downward from the gap between the rings and are sorted (see, for example, Patent Documents 1 and 2).

JP-A-8-71505 JP 2001-334212 A

  According to the above roller screen, for example, if the shape of the ring (the shape of the outer shape in front view along the axial direction of the support shaft) is a shape close to a perfect circle, the object to be processed does not move smoothly along the feed direction. There's a problem. In particular, such a tendency is strong when the conveying surface of the roller screen is horizontal rather than downward.

  Therefore, for example, there is a case where the ring shape is a star shape as in Patent Document 1 or the ring shape is a hexagonal shape as in Patent Document 2. However, when the ring has such a shape, there is a problem that the object to be processed is caught between the rollers and is not properly conveyed. This tendency is particularly strong when the object to be processed is a hard lump such as coal.

  SUMMARY OF THE INVENTION An object of the present invention is to improve the conveyance performance of an object to be processed on a roller screen and make it difficult for the object to be caught between rings.

  In order to solve the above-described problems, the present invention is configured such that a plurality of support shafts rotating around an axis by a driving force from a drive source are arranged in parallel, and a plurality of rings are provided along the axial direction of the support shafts. The rings of the support shaft are located at positions shifted from each other along the axial direction of the support shaft, and the object to be processed is supplied onto a transport surface formed above the support shaft and the ring. A roller screen that moves from the supply side to the discharge side along the feed direction by the rotation of the ring, and a small-sized object is dropped and selected from the gap between the rings. A roller screen was adopted in which the minimum distance of the outer surface from the axis of the support shaft was set to be less than the maximum distance from the axis of the support shaft and 84.8% or more of the maximum distance.

  Here, it is desirable to set the ratio of the minimum distance between the outer surface of the ring and the outer surface of the support shaft to 5 to 50% with respect to the minimum distance between the outer surfaces of the adjacent support shafts.

  In each of these configurations, the shape of the ring in a front view along the axial direction includes 3 to 8 maximum diameter vertices corresponding to the maximum distance portion in the axial direction, and the maximum diameter vertices A configuration in which the tip has an arcuate smooth outer surface can be employed.

  The outer surface at the tip of the maximum diameter portion apex may be a circular arc surface having a radius of 40 mm or more.

  Furthermore, in each of these configurations, the tip shape of the apex of the maximum diameter portion is a tapered shape in which the outer surfaces on both sides sandwiching the tip in the axial direction form a straight line, and the angle formed by the straight outer surfaces is 60. A configuration set at ° to 90 ° can be employed.

  According to the present invention, the minimum distance from the axis of the support shaft on the outer surface of the ring of the roller screen is set to be less than the maximum distance from the axis of the support shaft in the ring and 84.8% or more of the maximum distance. Therefore, the ratio of the difference in height between the top part, which is the largest part of the outer diameter of the ring, and the bottom part, which is the smallest part, is within the optimum range from the viewpoint of conveying the workpiece and preventing biting. The inventors have discovered. By adopting such a configuration, it is possible to improve the conveyance performance of the object to be processed on the roller screen and make it difficult for the object to be caught between the rings.

The top view which shows one Embodiment of this invention The same embodiment is shown, (a) is a main part enlarged plan view of a roller screen, (b) is a bb cross-sectional view of (a). Other embodiment is shown, (a) is a principal part enlarged plan view of a roller screen, (b) is bb sectional drawing of (a). The detail of the ring provided in a roller is shown, (a) is a perspective view which shows the ring of embodiment of FIG. 2, (b) is a perspective view which shows the ring of embodiment of FIG.

  An embodiment of the present invention will be described with reference to the drawings. In the roller screen 10 of this embodiment, a plurality of support shafts 12 are arranged in parallel on a rectangular frame 1 as shown in FIG. Each support shaft 12 is provided with a plurality of rings (rotors) 11 along the axial direction to constitute a roller 2.

  Each roller 2 is supported by the bearing portion 6 of the frame 1 so that both ends thereof are rotatable about the axis. A sprocket 4 is attached to the driving source side shaft portion 3 provided at one end portion as a driving force transmission portion. A chain 7 is wound as an endless member between the sprockets 4 of the adjacent rollers 2. By the driving force from the motor 5 provided as a driving source, the driving force is transmitted to the support shaft 12 via the sprocket 4 and the chain 7, and each support shaft 12 rotates in the same direction around the shaft.

  The adjacent rings 11 of the support shafts 12 are positioned so that their positions are shifted from each other along the axial direction of the support shaft 12.

  An object to be processed by the roller screen 10 is supplied onto a conveyance surface formed above the roller 2 including the support shaft 12 and the ring 11 and is pressed by the rotation of the roller 2 to be conveyed. It moves from the supply side to the discharge side along the feed direction on the surface.

  Due to the movement of the workpiece, the workpiece having a small size falls downward from the gap between the rollers 2, that is, the gap between the rings 11, and the workpiece having a large size is transferred to the discharge side. Sent to the process. As a result, the object to be processed is sorted according to the size of its outer shape.

  At this time, the number of support shafts 12 arranged in parallel is appropriately set based on the distance from the supply side to the discharge side. In addition, the number of rings 11 provided for one support shaft 12 is such that the selection contents of the object to be processed, that is, how large the object to be processed is dropped and how much object is to be processed. It is set as appropriate according to the content of the work whether it is transferred to the discharge side without dropping.

  The ring 11 is provided with three maximum diameter portion vertices 11a corresponding to the portion of the maximum distance R1 with the longest distance from the shaft center in the shape of the support shaft 12 along the axial direction in the axial direction. Yes. The maximum diameter portion vertices 11a are equally spaced (equally divided) in the direction around the axis.

  The minimum distance R2 from the axis of the support shaft 12 on the outer surface of the ring 11 is set to be less than the maximum distance R1 from the axis of the support shaft 12 and 87.5% of the maximum distance R1. . This numerical value is desirably less than 100% and 84.8% or more.

With such a setting, the difference in height between the top of the ring 11 having the largest outer diameter (hereinafter, the portion having the largest outer diameter is referred to as the maximum diameter portion apex 11a) and the bottom of the smallest portion. Experiments have revealed that the ratio is in an optimum range from the viewpoint of conveying the workpiece and preventing biting. With such a setting, it is possible to improve the conveyance performance of the object to be processed and to make the roller screen 10 in which the object to be processed is difficult to bite between the rings.

  At this time, the ratio of the minimum interval W2 between the outer surface of the ring 11 and the outer surface of the support shaft 12 to the minimum interval W1 between the outer surfaces of the adjacent support shafts 12 is preferably set to 5 to 50%. This also became clear through experiments. In this embodiment, it is set to 26.5%.

  In this embodiment, all the support shafts 12 are arranged in parallel, and all the support shafts 12 have the same diameter and are arranged at equal intervals. Therefore, the interval between the outer surfaces of the adjacent support shafts 12 is as follows. It is constant in any place, and the minimum interval W1 between the outer surfaces of the support shaft 12 is the constant value. However, when the interval between the outer surfaces of the adjacent support shafts 12 is not constant, the minimum portion of the intervals is set as the minimum interval W1.

  In the embodiment of FIG. 2, the shape of the ring 11 in the front view along the axial direction of the support shaft 12 includes three maximum diameter portion vertices 11a corresponding to the portion of the maximum distance R1 in the axial direction, The tip of the maximum diameter portion apex 11a has an arcuate smooth outer surface. By making the tip of the maximum diameter portion apex 11a a smooth circular arc surface, it is possible to apply an appropriate conveying force (pressing force) to the object to be processed and to prevent the object to be processed from being caught between the rollers 2.

  At this time, it is desirable that the outer surface at the tip of the maximum diameter portion vertex 11a is set to an arc surface having a radius of 40 mm or more.

  Moreover, the ring 11 of this embodiment is provided with intermediate portion vertices 11b that protrude slightly toward the outer diameter side from both side portions in the direction around the axis between the maximum diameter portions vertices 11a adjacent in the direction around the axis. The distance R3 from the axis of the support shaft 12 of the intermediate vertex 11b is set between the maximum distance R1 and the minimum distance R2. Providing such an intermediate apex 11b is more effective for securing the aforementioned conveying force and preventing biting.

  Here, it is preferable that the intermediate portion vertex 11b is eccentric to the downstream side in the rotation direction of the roller 2 from the center between the maximum diameter portion vertices 11a adjacent in the direction around the axis.

  Moreover, the ring 11 of this embodiment is comprised by the plate-shaped annular member separate from the shaft member which comprises the support shaft 12, and in the attachment hole 11c provided in the center of the ring 11 which consists of the annular member, The support shaft 12 is inserted and integrated to constitute the roller 2. The roller 2 may be formed by molding the ring 11 and the support shaft 12 into an integral member.

  In this embodiment, the example of the triangular ring 11 having the maximum diameter portion vertex 11a in three positions around the axis has been described. However, the number of the maximum diameter portion vertex 11a is more than three, for example, 4 to It is good also as the polygonal ring 11 made into eight places. In any case where the number of the maximum diameter portion vertices 11a is 3 to 8, it is desirable that the maximum diameter portion vertices 11a are equally spaced in the direction around the axis (equal direction), and the ring 11 is formed in a regular polygon shape. .

  Moreover, it can be set as the structure which provided the intermediate | middle part vertex 11b in any part between all the adjacent largest diameter part vertices 11a, or all the places irrespective of the number of places of the largest diameter part vertex 11a. . At this time, it is desirable that the middle vertex 11b be equally spaced (equally divided) in the direction around the axis.

Another embodiment is shown in FIG. This embodiment is an octagonal ring 11 in which the maximum diameter portion apex 11a of the ring 11 is eight in the axial direction. The maximum diameter portion vertices 11a are arranged at equal intervals (equally divided direction) in the direction around the axis.

That is, the ring 11 has eight maximum diameter portion vertices 11a corresponding to the maximum distance R1 in the axial direction, and the tips of the maximum diameter portion vertices 11a have an arcuate smooth outer surface. It is the same that the outer surface at the tip of the maximum diameter portion apex 11a is preferably an arc surface having a radius of 40 mm or more.

  Also in this embodiment, similarly, the minimum distance R2 from the axis of the support shaft 12 on the outer surface of the ring 11 is less than the maximum distance R1 from the axis of the support shaft 12 and the maximum distance R1. It is set to 84.8% or more so as to improve the conveyance performance of the workpiece and prevent the workpiece from being caught between the rings.

  Further, the ratio of the minimum interval W2 between the outer surface of the ring 11 and the outer surface of the support shaft 12 to the minimum interval W1 between the outer surfaces of the adjacent support shafts 12 is also set to 5 to 50%. is there.

  In the embodiment of FIG. 3, the ring 11 has a regular octagonal shape, and the outer surfaces on both sides in the axial direction sandwiching the tip of the maximum diameter portion vertex 11a are linear in the front view. The angle α formed between the linear outer surfaces is set to 135 °. This angle is set to 60 ° if the ring 11 is a regular triangle, 90 ° if the ring 11 is a square, and 108 ° if the ring 11 is a regular pentagon.

  By the way, when the ring 11 rotates and the workpiece to be bitten moves from the bottom to the top (maximum diameter portion vertex 11a) of the ring 11, the top and the outer surface of the adjacent support shaft 12 Since the gap of the ring 11 gradually decreases with time, it is a corner portion of the ring 11 in the plate thickness direction, that is, a corner portion of the ring 11 in the axial center direction, between the outer surface around the axis and both end surfaces in the axial direction. Biting is likely to occur at the ridgeline.

  Therefore, the cross-sectional shape of the tip of the maximum diameter vertex 11a is slightly sharpened, and the diameter is gradually reduced toward the outside in the axial direction on both sides in the axial direction of the support shaft 12 across the tip of the maximum diameter vertex 11a. Provide a straight outer surface. That is, in the cross section in the plate thickness direction of the ring 11, the cross-sectional shape of the maximum diameter portion vertex 11a is a tapered V-shape. If the angle formed between the outer surfaces on both sides sandwiching the tip is set to, for example, 60 ° to 90 °, the object to be processed can be moved in the axial direction when the gap between the ring 11 and the support shaft 12 is gradually reduced. This is effective for preventing biting. In the example of FIG. 2, this angle β is set to 70 °.

  In the embodiment of FIG. 3, in the cross section in the plate thickness direction of the ring 11, the outer surface of the ring 11 is a flat surface (cylindrical surface) parallel to the axial direction of the support shaft 12. You may comprise two linear surfaces which make the angle (beta) mutually.

  Further, the ring 11 of the embodiment of FIG. 3 does not have an intermediate vertex 11b between the maximum diameter vertexes 11a adjacent to each other in the axial direction, but this is the same as the example of FIG. It is also possible to adopt a configuration in which an intermediate vertex 11b is provided between the maximum diameter vertexes 11a adjacent in the direction.

  In the above embodiment, the contents of the present invention have been described by taking two forms of the ring 11 as an example. However, the present invention is not limited to the above embodiment, and the outer surface of the ring 11 extends from the axis of the support shaft 12. By setting the minimum distance R2 to be less than the maximum distance R1 from the axis of the support shaft 12 and 84.8% or more of the maximum distance R1, the effect of securing a predetermined conveying force and preventing biting can be exhibited. be able to.

  Desirably, the ratio of the minimum interval W2 between the outer surface of the ring 11 and the outer surface of the support shaft 12 to the minimum interval W1 between the outer surfaces of the adjacent support shafts 12 is set to 5 to 50%. The effect can be further enhanced.

  Further, the shape of the ring 11 in the front view along the axial direction of the support shaft 12 includes 3 to 8 maximum diameter vertices 11a corresponding to the portion of the maximum distance R1, and the maximum diameter vertices 11a. It is desirable that the tip end of the arc be an arc-shaped smooth outer surface, and the arc-shaped outer surface be an arc surface having a radius of 40 mm or more.

  Further, the tip shape of the maximum diameter portion apex 11a of the ring 11 is a tapered shape in which the outer surfaces on both sides sandwiching in the axial direction of the support shaft 12 form a linear shape, and the angle β formed by the linear outer surfaces is 60 °. It is desirable to set to ~ 90 °.

1 Frame 2 Roller 3 Drive source side shaft 4 Drive force transmitting part (sprocket)
5 Drive source (motor)
6 Bearing 7 Endless member (chain)
10 Roller screen 11 Ring (rotor)
11a Maximum diameter apex 11b Intermediate apex 11c Mounting hole 12 Support shaft

Claims (6)

A plurality of support shafts (12) rotating around an axis by a driving force from a drive source (5) are arranged in parallel, and a plurality of rings (11) are provided along the axial direction of the support shaft (12), and adjacent to each other. The positions of the rings (11) of the support shaft (12) are shifted from each other along the axial direction of the support shaft (12), and the object to be processed is the support shaft (12) and the ring ( 11) is supplied onto the conveying surface formed above 11 and moved from the supply side to the discharge side along the feeding direction by the rotation of the ring (11), and a workpiece to be processed having a small size is transferred to the ring (11). ) In the roller screen (10) that falls down and is selected from the gap between
The minimum distance (R2) of the outer surface of the ring (11) from the axis of the support shaft (12) is less than the maximum distance (R1) from the axis of the support shaft (12) and the maximum distance (R1). ) 84.8% or more,
In a front view along the axial direction of the ring (11), the maximum diameter portion apex (11a) corresponding to the portion of the maximum distance (R1) is provided at three or more locations in the axial direction, and adjacent to each other in the axial direction Between the maximum diameter portion apex (11a), an intermediate portion in which the distance (R3) from the axis of the support shaft (12) is set between the maximum distance (R1) and the minimum distance (R2). Roller screen with vertices (11b). 2. The roller according to claim 1, wherein the intermediate vertex (11 b) is eccentric to the downstream side in the rotational direction of the roller (2) from the center between the maximum diameter vertexes (11 a) adjacent in the direction around the axis. screen.   The ratio of the minimum interval (W2) between the outer surface of the ring (11) and the outer surface of the support shaft (12) to the minimum interval (W1) between the outer surfaces of the adjacent support shafts (12) is 5 to 5. The roller screen according to claim 1 or 2, which is set to 50%.   The roller screen according to any one of claims 1 to 3, wherein a tip of the maximum diameter portion vertex (11a) is an arc-shaped smooth outer surface in the front view.   5. The roller screen according to claim 4, wherein an outer surface of a tip of the maximum diameter portion apex (11 a) is an arc surface having a radius of 40 mm or more.   The tip shape of the maximum diameter portion apex (11a) has a tapered shape in which the outer surfaces on both sides sandwiching the tip in the axial direction form a straight line, and the angle (β) formed between the straight outer surfaces is 60 ° to The roller screen according to claim 1, wherein the roller screen is set at 90 °.

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