JP2004305843A - Operation method for rolling screen, and rolling screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly discharge even a viscous or sticky raw material through a gap between rotary rolls each with a disk, in a short period of time by throughput higher than before. <P>SOLUTION: When sieving out the viscous or sticky raw material by a rolling screen provided with the plurality of rotary rolls each with the disk arranged at a prescribed interval, a raw material clamping operation of rotationally driving the adjacent rotary rolls with the disks in directions opposite to each other is performed. The rolling screen is provided with the plurality of the rotary rolls with the disks arranged at the prescribed interval and a rotating direction control means for controlling the rotating direction of the rotary drive source of the respective rotary rolls with the disks and rotating the adjacent rotary rolls with the disks in the directions opposite to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an operation method of a roll screen and a roll screen capable of dispensing a viscous / adhesive raw material with a high processing capacity.
[0002]
[Prior art]
For example, sieving raw materials such as dewatered cakes made of iron-containing dust generated when iron-containing dust (dust) is treated at an ironworks, and construction-generated soil generated as a by-product at civil engineering and construction sites. A roll screen is used as the equipment. The undersize (undersize product) sieved by the roll screen is supplied to the downstream process, and the oversize (oversize product) is conveyed to the outside of the roll screen and discharged. An example of such a roll screen is disclosed in JP-A-2001-212516.
[0003]
This conventional roll screen includes a plurality of rotating rolls with disks arranged at predetermined intervals. In each rotating roll with a disc, a plurality of hollow disc-shaped rotating discs (also referred to as rotating rollers or flanges) perpendicular to the roll axis are fixed to the outer peripheral surface of the roll at intervals in the roll axis direction. Fitting). Thereby, the circumferential grooves formed between the rotating disks of the rotating rolls with the disks are aligned and aligned along the flow direction of the raw material, that is, in the direction perpendicular to the roll axis and on the straight line, and at predetermined intervals. In this case, the gap formed by the circumferential groove between the adjacent rotating rolls and the adjacent rotating disks is “sieve mesh”.
[0004]
The raw material larger than the gap is conveyed on the rotating rolls by the respective rotating rolls with disks rotating in the same direction and discharged as oversized products. On the other hand, items smaller than the gap (sieve mesh) are discharged through this gap.
[0005]
Note that this conventional roll screen is configured such that every other rotating roll with a disk among a plurality of rotating rolls with a disk, that is, adjacent rotating rolls with a disk are rotationally driven by different types of driving devices. By doing so, even if a hard wedge-shaped raw material such as crushed stone is locked in the gap, even if one line is stopped, the remaining lines can continue to operate, without stopping the entire roll screen. I am trying.
[0006]
[Patent Document 1]
JP 2001-212516 A (FIGS. 1 and 4)
[0007]
[Problems to be solved by the invention]
However, in the above-mentioned conventional roll screen, since the rotating rolls with the discs are driven to rotate in the same direction, there is almost no crushing action, so that the viscous raw material (for example, dehydrated cake) or the sticky adhesive In the case of viscous / adhesive raw materials such as raw materials, most of the raw materials can be dispensed simply by moving on the rotating rolls with disks or by simply staying in the gap between the rotating rolls with disks. There was a problem that could not be done.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for operating a roll screen and a roll capable of dispensing a viscous / adhesive raw material with a high processing capacity. To provide a screen.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0010]
According to the first aspect of the invention, when the viscous / adhesive raw material is sieved by a roll screen having a plurality of rotating rolls with disks arranged at predetermined intervals, adjacent rotating rolls with disks are rotated in opposite directions. This is a method for operating a roll screen, characterized by performing a raw material sandwiching operation.
[0011]
The invention according to claim 2 is that, when the viscous / adherent raw material is sieved by a roll screen having a plurality of rotating rolls with disks arranged at predetermined intervals, the rotating rolls with adjacent disks are rotationally driven in opposite directions. And a roll screen operating method in which a raw material sandwiching operation in which the rotation direction is reversed at a later time is performed.
[0012]
According to a third aspect of the present invention, in the method for operating a roll screen according to the first or second aspect, after the raw material sandwiching operation is performed, the plurality of rotating rolls with disks are driven to rotate in the same direction, so that the rotating rolls are disposed outside the roll screen. It is characterized by discharging oversized products.
[0013]
According to a fourth aspect of the present invention, in the method for operating a roll screen according to any one of the first to third aspects, the scrape removes the viscous / adhesive raw material adhering to each of the rotating rolls with a disc while scraping the raw material. It is characterized in that a rotating roll with a disk is driven to rotate.
[0014]
The invention according to claim 5 is that, by controlling the rotation direction of a plurality of rotating rolls with disks arranged at predetermined intervals and a rotation drive source of each rotating roll with disks, the rotating rolls with adjacent disks are rotated in opposite directions. A roll direction control means for rotating the roll screen.
[0015]
The invention according to claim 6 is that, by controlling the rotation direction of a plurality of rotating rolls with disks arranged at predetermined intervals and the rotation drive source of each rotating roll with disks, the rotating rolls with adjacent disks are moved in opposite directions. A roll screen, comprising: a rotation direction control unit that rotates and reverses the rotation direction at a later time.
[0016]
According to a seventh aspect of the present invention, in the roll screen according to the fifth or sixth aspect, the rotation direction control means rotates the plurality of rotary rolls with disks in the same direction when discharging the oversized product outside the roll screen. It is characterized in that the rotation direction is switched.
[0017]
According to an eighth aspect of the present invention, there is provided the roll screen according to any one of the fifth to seventh aspects, further comprising a scraper for scraping a raw material adhered to each of the rotating rolls with disks. .
[0018]
According to a ninth aspect of the present invention, in the roll screen according to any one of the fifth to eighth aspects, each of the disks has an elliptical plate shape.
[0019]
According to the operation method of the roll screen of the first aspect or the roll screen of the fifth aspect, the raw material sandwiching operation (first raw material sandwiching operation) in which the adjacent rotary rolls with disks are driven to rotate in opposite directions to each other. As a result, an action of sandwiching large lumps of viscous / adhesive raw material between the adjacent rotating rolls with disks has the effect of crushing. As a result, even the viscous / adhesive raw material can be smoothly dispensed through the gap (sieve) between the rotating rolls with disks, and can be dispensed in a shorter time with a higher processing capacity than in the past.
[0020]
Here, the large mass of the raw material is disintegrated and dispensed so that the portion in contact with the rotating disk annular surface is sandwiched and cut off. At this time, especially in the case of a highly viscous high-viscosity raw material, when the raw material sandwiching operation is performed, the rotating disk eventually starts to slip at a contact portion with the large mass of the high-viscosity raw material, and Traces are left, the action of pinching and crushing is reduced, and the dispensing capacity is greatly reduced.
[0021]
Therefore, according to the roll screen operating method of the second aspect or the roll screen of the sixth aspect, the raw material sandwiching operation (the second operation) in which the rotating directions of the adjacent rotating rolls with disks rotating in opposite directions are periodically reversed. Raw material sandwiching operation), the large mass of the raw material is moved between the rotating rolls with the other disks when the rotation direction is reversed, and the contact portion between the large mass of the raw material and the rotating disk is updated. Since a large amount of raw material can be disintegrated by a new pinching, the dispensing processing capacity can be stabilized. As a result, even high-viscosity raw materials can be dispensed with a high processing capacity. In this case, for example, adjacent rotating rolls with disks are driven to rotate in opposite directions for 10 seconds (the peripheral speed of the rotating disk is, for example, 0.3 m / s), and then stop rotating for several seconds, and then rotate. The direction is reversed and rotationally driven for 10 seconds. When a raw material is loaded on the rotating roll with a disc, a series of such operations are repeated for the loaded raw material for a predetermined time.
[0022]
When viscous / adhesive raw materials contain oversized (screen-over) gravel, etc., the raw material sandwiching operation drives the adjacent rotating rolls with disks to rotate in opposite directions. During operation, oversized gravel is not discharged from the roll screen but remains on the rotating roll with the disc.
[0023]
Therefore, according to the roll screen operating method of the third aspect or the roll screen of the seventh aspect, after the raw material sandwiching operation is performed, the rotary rolls with disks provided on the roll screen are rotationally driven in the same direction. As a result, oversized gravel and the like can be transported to the outside of the roll screen and discharged.
[0024]
When sieving viscous / adhesive raw materials, especially in the case of highly adherent raw materials having high adhesiveness (adhesiveness), the highly adherent raw materials adhere to and accumulate on the rotating rolls with disks as the processing time elapses, and the rotating with disks When the roll is in the form of a plain roll, the action of pinching and crushing is reduced, and the payout processing capacity is reduced.
[0025]
Therefore, according to the method of operating the roll screen of claim 4 or the roll screen of claim 8, each of the rotary rolls with disks is driven to rotate while scraping the viscous / adhesive raw material with a scraper, so that high adhesion is achieved. Even in the case of a raw material, it is possible to prevent a decrease in the action of sandwiching and crushing, and to pay out with a high processing capacity.
[0026]
According to the roll screen of the ninth aspect, each of the rotary rolls with disks has a hollow elliptical rotary disk having a hollow elliptical plate fixed (fitted) to the outer peripheral surface of the roll. The crushing action by pinching is more remarkable than that of a rotating disk, so that the dispensing processing capacity can be increased.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
The configuration of the roll screen according to one embodiment of the present invention will be described. FIG. 1 is a plan view showing the configuration of the roll screen according to the present invention. In FIG. 1, the raw material hopper 10, the raw material guide plate 11, the upper frame 13, and the side cover 12 are not shown for easy understanding.
[0029]
As shown in FIG. 1, the frame 3 has a rectangular shape with front and rear frames 3a and 3b and left and right frames 3c and 3d facing each other. Here, the right side in FIG. 1 (the discharge side of the oversized product, which is the downstream side) is forward, and the frame on the right side in a plan view toward the front is the right frame 3d. The front sides of the left and right frames 3c and 3d are set at lower positions than the rear side, and the frame 3 is inclined downward and forward. For example, the downward inclination angle of the frame 3 is set to 10 ° with respect to the horizontal. A plurality of rotating rolls 1 and 1 'with disks are arranged between the left and right frames 3c and 3d so as to be rotatable at predetermined intervals.
[0030]
These rotating rolls with disks 1, 1 'are composed of rotating rolls with disks 1 arranged in odd-numbered rows from the rear frame 3b side (upstream side) and rotating rolls with disks 1' arranged in even-numbered rows. Has become. In the rotating rolls 1 and 1 'with disks, a plurality of hollow disk-shaped rotating disks 1a perpendicular to the roll axis are fixed (fitted) to the outer peripheral surface of the roll at intervals in the roll axis direction. I have. In addition, the rotating disks 1a of the rotating rolls 1 and 1 'with disks adjacent to each other are arranged such that the rotating disks 1a are in a staggered arrangement.
[0031]
Reference numeral 4 denotes a first drive motor, and reference numeral 5 denotes a second drive motor. Each of the rotating rolls 1 with disks arranged in odd rows from the rear frame 3b side (upstream side) performs first driving via a chain 7 meshed and wound around a sprocket 6 which is axially attached to the shaft end thereof. Rotational power is given from the motor 4 so that the motor 4 is rotated simultaneously in a predetermined direction. Each of the rotating rolls 1 'with disks arranged in even-numbered rows from the rear frame 3b side is driven by a second drive motor via a chain 7 meshed and wound around a sprocket 6 mounted on the shaft end. Rotational power is given from the motor 5, and the motors 5 are simultaneously rotated in a predetermined direction. The first drive motor 4, the sprocket 6, and the chain 7 constitute a drive mechanism that drives the rotary rolls 1 with disks in the odd-numbered rows to rotate. In addition, the second drive motor 5, the sprocket 6, and the chain 7 constitute a drive mechanism for rotating and driving the even-numbered row of rotary rolls 1 'with disks.
[0032]
FIG. 2 is a sectional view taken along line AA of FIG.
[0033]
As shown in FIG. 2, a bearing 8 for supporting the shaft end of the rotating roll 1 with a disk is fixed to each of the left and right frames 3c, 3d. It is rotatably supported. The same applies to the rotating roll with disk 1 'arranged in the even-numbered row.
[0034]
Further, a scraper 9 is provided immediately below each of the rotating rolls 1 and 1 'with a disc so as to maintain a gap between the rotating rolls 1 and 1' with a disc, as shown in FIG. I have. The scraper 9 is exchangeably attached to the left and right frames 3c and 3d by bolts. The scraper 9 may be capable of adjusting the gap between the rotating rolls 1 and 1 'with a disc. By doing so, the gap can be adjusted in accordance with the degree of wear of the scraper 9, and the scraper 9 can be lightly brought into contact with the rotating rolls 1 and 1 'to increase the scraping ability.
[0035]
As shown in FIG. 2, a raw material hopper 10 for supplying the supplied viscous / adhesive raw material onto the rotating rolls 1 and 1 ′ with disks is provided above the rotating rolls 1 and 1 ′ with disks. A raw material guide plate 11 is provided to prevent the viscous / adherent raw material from spilling from both end portions of the rotating rolls 1 and 1 ′ with disks and from being applied to the bearing 8. Reference numeral 12 denotes a safety side cover. The raw material hopper 10 and the raw material guide plate 11 are supported by an upper frame 13. The upper frame 13 is fixed to a vertical frame (not shown) that extends in the vertical direction and is provided on the left and right frames 3c and 3d. In addition, the raw material hopper 10 is mounted on the upper frame 13 so as to be able to be turned upside down as shown in FIG. 2 in order to satisfy the height limit when the roll screen is mounted on the vehicle. The viscous / adhesive raw material is supplied to the raw material hopper 10 by, for example, a hydraulic shovel.
[0036]
Further, the roll screen of the present embodiment includes a sequencer (programmable controller). The first drive motor 4 and the second drive motor 5 are controlled by a control panel (not shown) for starting and stopping, and a rotation direction. It is controlled by a sequencer housed inside. This sequencer controls the rotation direction of the two drive motors 4 and 5 to rotate the adjacent rotary rolls 1 and 1 'with disks in directions opposite to each other during a first raw material sandwiching operation described later. Is composed. Further, this sequencer controls the rotation direction of the drive motors 4 and 5 to rotate the adjacent rotating rolls 1 and 1 'with disks in directions opposite to each other during a second raw material sandwiching operation to be described later. Constitute rotation direction control means for reversing the rotation direction. Further, the sequencer (rotation direction control means) performs the first or second raw material sandwiching operation to convey and discharge the oversized product to the outside of the roll screen, and then performs the rotation rolls 1 and 1 'with disks. In the same direction (clockwise as viewed from the right frame 3d in FIG. 1).
[0037]
A method of treating a viscous / adhesive raw material containing gravels using the roll screen configured as described above will be described. First, the first raw material sandwiching operation will be described. By controlling the rotation direction of the drive motors 4 and 5 by the sequencer, a first raw material sandwiching operation for rotating the adjacent rotary rolls 1 and 1 ′ with disks in opposite directions is performed. As a result, a large mass of viscous / adhesive raw material is sandwiched between the adjacent rotary rolls 1 and 1 'with a disk and crushed, so that even the viscous / adhesive raw material smoothly intervenes between the rotary rolls 1 and 1'. Can be dispensed through a gap (sieve mesh), and can be dispensed in a short time with a higher processing capacity than in the past.
[0038]
In this case, even when a highly adhesive raw material having a particularly high adhesiveness is used, the rotating rolls 1 and 1 'with a disk are rotated while scraping the highly adhesive raw material that adheres to the rotating rolls 1 and 1' with a disk with the scraper 9. As a result, it is possible to prevent a decrease in the action of sandwiching and crushing, and to perform payout with a high processing capacity.
[0039]
After the first raw material sandwiching operation, the rotating rolls 1 and 1 ′ with disks are driven to rotate clockwise as viewed from the right frame 3d side, thereby removing oversized gravel contained in the viscous and sticky raw material. It can be conveyed and discharged from the front frame 3a side (downstream side).
[0040]
Next, the second raw material sandwiching operation will be described. By controlling the rotation direction of the drive motors 4 and 5 by the sequencer, the second raw material that rotates the adjacent rotation rolls 1 and 1 ′ with disks in directions opposite to each other and periodically reverses the rotation direction. The pinching operation is performed. Thereby, when the rotation direction is reversed, a large lump of the viscous / adhesive raw material is moved between the rotating rolls 1 and 1 'with disks, and the contact portion between the large lump of the raw material and the rotating disk 1a is updated. A new crushing action by pinching can be generated for a large lump, so that the dispensing processing capacity can be stabilized.
[0041]
As a result, even high-viscosity raw materials with particularly high viscosity can be dispensed with a higher processing capacity than before. In this case, for example, the rotating rolls 1 and 1 'with disks adjacent to each other are driven to rotate in opposite directions for 10 seconds, then temporarily stopped for 3 seconds, and then rotated for 10 seconds by reversing the rotating direction. . Thus, a series of operations are repeated according to the predetermined time schedule. Then, after the second raw material sandwiching operation, the rotating rolls 1 and 1 'with disks are rotated clockwise as viewed from the right frame 3d side, so that the oversize contained in the viscous / adhesive raw material is rotated. Can be conveyed and discharged from the front frame 3a side. In the raw material sandwiching operation, the time for driving the rotary rolls 1 and 1 ′ to rotate can be appropriately determined according to the raw material properties and the like, and the number of repetitions can be appropriately determined according to the processing amount and the like. In addition, in order to perform the operation from the discharge of the raw material by the sandwiching operation to the discharge of the oversized product, automatic operation control by the sequencer is desirable, but the operation control is performed by a manual operation of the operator for some or all of the operations. You may.
[0042]
FIG. 3 is a front view showing another embodiment of the rotating roll with a disk according to the present invention, and FIG. 4 is a side view as viewed in the direction of arrow B in FIG.
[0043]
As shown in FIGS. 3 and 4, this rotating roll 2 with a disk has a hollow elliptical rotating disk 2 a fixed to the outer peripheral surface of the roll, unlike the hollow disk-shaped rotating disk 1 a. I have. The phases of adjacent rotating disks 2a in the rotating roll 2 with disks are shifted by 90 degrees. By providing such a rotating roll 2 with a disc, the crushing action by pinching can be enhanced as compared with a rotating disc having a hollow disk-shaped rotating disc 1a, and a higher processing capacity can be obtained.
[0044]
In this case, assuming that the value of the major axis of the ellipse in the rotating disk 2a is b and the value of the minor axis is a, the shape of the rotating disk 2a is preferably set to satisfy (a / b) ≧ 0.63. By doing so, the roll shaft in the case where a sphere having a diameter corresponding to the gap (sieve mesh) between the adjacent rotary rolls 2 is brought into contact with both the roll shaft and the rotary disk 2a of the adjacent rotary rolls 2 with disks. And the angle α (called a nip angle or a biting angle) formed by both tangents drawn to the contact point on the rotating disk 2a is about 25 ° or more. Thereby, when performing the raw material sandwiching operation, an effect is obtained that it is difficult to bite the gravel larger than the sieve mesh. The value of nip angle α ≧ 25 °, which is a condition under which gravel is difficult to bite, is empirically determined in consideration of the friction coefficient with gravel when the rotating roll 2 having the elliptical rotating disk 2a is made of an iron-based material. This is the derived value. When a rotating roll 2 having an elliptical rotating disk 2a is used, if the phase of the rotating disk 2a in the adjacent rotating rolls 2 is adjusted by the number of rotations, the rotating disk 2a in the adjacent rotating rolls 2 is adjusted. There is no need to stagger.
[0045]
【The invention's effect】
As described above, according to the roll screen operating method or the roll screen of the present invention, even the viscous / adhesive raw material can be smoothly dispensed through the gap between the rotating rolls with the disc, compared to the related art. Payment can be performed in a short time with high processing capacity.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a roll screen according to the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a front view showing another embodiment of the rotating roll with disk according to the present invention.
FIG. 4 is a side view as viewed in the direction of arrow B in FIG. 3;
[Explanation of symbols]
1, 1 ', 2 ... Rotating roll with disk 1a, 2a ... Rotating disk 3 ... Frame 3a ... Front frame 3b ... Rear frame 3c ... Left frame 3d ... Right frame 4 ... First drive motor 5 ... Second drive motor 6 Sprocket 7 Chain 8 Bearing 9 Scraper 10 Material hopper 11 Material guide plate 12 Side cover 13 Upper frame

Claims (9)

When sieving viscous / adherent raw materials by a roll screen having a plurality of rotating rolls with disks arranged at predetermined intervals, a material sandwiching operation of rotating adjacent rotating rolls with disks in directions opposite to each other is performed. Driving method of roll screen, which is a feature. Upon sieving the viscous / adherent raw material by a roll screen having a plurality of rotating rolls with disks arranged at predetermined intervals, the rotating rolls with adjacent disks are rotationally driven in opposite directions to each other, and after a while. A method for operating a roll screen, comprising performing a raw material sandwiching operation of reversing a rotation direction. 3. The roll screen according to claim 1, wherein after the raw material sandwiching operation is performed, the plurality of rotating rolls with disks are rotationally driven in the same direction to discharge an oversized product to the outside of the roll screen. 4. how to drive. The roll according to any one of claims 1 to 3, wherein each of the rotary rolls with a disk is driven to rotate while scraping a viscous / adherent raw material attached to the rotary roll with a disk with a scraper. Screen driving method. A plurality of rotating rolls with disks arranged at predetermined intervals, and a rotating direction control means for controlling the rotating direction of a rotary drive source of each rotating roll with disks, and rotating adjacent rotating rolls with disks in opposite directions. A roll screen comprising: A plurality of rotating rolls with disks arranged at predetermined intervals, and controlling the rotation direction of the rotary drive source of each rotating roll with disks, rotating adjacent rotating rolls with disks in opposite directions, and reducing the time. A roll direction control means for reversing the direction of rotation. 7. The roll according to claim 5, wherein the rotation direction control unit switches the rotation direction to rotate the plurality of disk-equipped rotary rolls in the same direction when discharging the oversized product to the outside of the roll screen. 8. screen. The roll screen according to any one of claims 5 to 7, further comprising a scraper for scraping a raw material adhering to each of the rotating rolls with disks. The roll screen according to any one of claims 5 to 8, wherein each of the disks has an elliptical plate shape.

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