Roller screen and roller replacement method for roller screen

Abstract

To provide a roller screen capable of suppressing replacement cost of components in the case of wear and a roller exchange method capable of securing fastening power between the roller and a shaft body over a long period.SOLUTION: A roller screen has a plurality of parallel rollers 11 and a frame 12 freely rotatably supporting both ends in a shaft direction of the roller 11 with a pair of side wall parts 13 around the shaft of the roller 11 and a configuration in which both ends of the roller 11 are connected to the shaft body 32 and the end parts of the roller 11 are arranged outside an inner surface of the side wall part 13. A roller exchange method includes: a connection step which connects the shaft body 32 to both ends of the roller 11; a fixing step which fixes the roller 11 and the shaft body 32 connected in the connection step with a bolt 40 and one or more kinds of fixing means selected from a washer 41, a key component 39, a pin 45, and a welding part 42; and a fitting step which fits the roller 11 and the shaft body 32 fixed in the fixing step across the pair of side wall parts 13 of the frame 12 of the roller screen 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a roller screen and a method for replacing rollers of a roller screen. [Background technology]

[0002] Roller screens are used to classify materials to be treated, such as soil and sand, crushed stone, ore, coke, and various other lumps and granules. As shown in FIG. 1 of Patent Document 1 below, for example, these roller screens have multiple rollers arranged in parallel at a predetermined interval, which are rotated around their axes by a drive unit. The materials to be treated move on the rollers in the direction of their rotation. A gap of a predetermined size is formed between adjacent rollers, and materials smaller than the gap are sieved out between the rollers, while larger materials pass through the rollers and are sieved out according to their size.

[0003] The surfaces of rollers used in roller screens are subject to wear due to contact with the workpiece. Therefore, when the wear reaches a predetermined level, the rollers must be replaced. Typically, the surfaces of these rollers are made of highly wear-resistant materials, and frequent roller replacement is costly. Therefore, for example, in the configuration described in Patent Document 1 below, the roller is divided into a roll core and a wear-resistant cylindrical body fitted around the outer periphery of the roll core. By replacing only the wear-resistant cylindrical body when the roller wears, the cost of the roller is reduced. Similarly, in the configuration described in Patent Document 2 below, the roller is detachable from the shaft that rotatably supports the roller, allowing only the roller to be replaced when it wears. In these configurations, costs are reduced by not using wear-resistant materials for the axial bodies, such as the roll core and shaft. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication number 3-51016 [Patent Document 2] Japanese Patent Application Publication No. 9-1073 Summary of the Invention [Problem to be solved by the invention]

[0005] In the configurations described in Patent Documents 1 and 2, the roller and shaft are both separable, allowing only the roller to be replaced when worn, thereby reducing replacement costs. However, in these configurations, small pieces or powder from the workpiece may become trapped in the gap between the inner end of the frame and the shaft, causing the shaft, which has low wear resistance, to wear and require replacement, which may increase replacement costs. Furthermore, in the configurations described in Patent Documents 1 and 2, the roller and shaft are fixed using a single type of fixing means, such as a pin, key member, frictional fastening member, or bolt, and the fastening force may decrease over long-term use, causing the roller and shaft to spin freely.

[0006] Therefore, an object of the present invention is to reduce the cost of replacing components when they wear out, and to ensure the fastening force between the roller and the shaft over a long period of time. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A plurality of rollers arranged in parallel; a frame that supports both axial ends of the rollers by a pair of side walls in a state in which the plurality of rollers are housed therein so as to be rotatable around the axes of the rollers; and Both ends of the roller are connected to a shaft that is driven to rotate by a drive device, and the roller screen is configured such that the ends of the roller are positioned outside the inner surface of the side wall portion.

[0008] This makes it difficult for small pieces or powder from the workpiece being transported inside the frame to reach the shaft, thereby preventing wear on the shaft caused by small pieces or powder and reducing the cost of replacing the shaft.

[0009] In the above configuration, It is preferable that a sealing member is provided between the side wall portion and the end of the roller.

[0010] This can reliably prevent small pieces and powder from reaching the shaft, thereby enhancing the effect of preventing wear on the shaft.

[0011] In each of the above configurations, It is preferable that the roller and the shaft are connected by a bolt.

[0012] This makes it easy to connect and disconnect the rollers and shafts, and allows smooth assembly of the roller screen and replacement of the rollers.

[0013] In the configuration in which the bolt connects the roller and the bolt, It is preferable that the bolt has a welded portion formed thereon to prevent the bolt from rotating.

[0014] This prevents problems such as the bolt loosening over time, causing the roller and shaft to spin freely.

[0015] In the configuration in which the bolt connects the roller and the bolt, It is preferable that a washer is provided to straddle a plurality of the bolts, and the welded portion is formed across the bolts and the washer.

[0016] In this way, adjacent bolts are prevented from rotating relative to each other via the washers, so that loosening of the bolts can be reliably prevented.

[0017] In the configuration in which the bolt connects the roller and the bolt, It is preferable that the roller and the shaft are prevented from rotating by a key member or a pin interposed between the roller and the shaft.

[0018] In this way, in addition to the fastening force of the bolt, the key member or pin provides an anti-rotation effect, which reliably prevents problems such as the roller and shaft spinning freely over time.

[0019] In order to solve the above problems, the present invention provides: a connecting step of connecting a shaft body to both ends of the roller; a fixing step of fixing the roller and the shaft body connected in the connecting step by one or more fixing means selected from a bolt, a washer, a key member, a pin, and a welded portion; an attachment step of attaching the roller and the shaft fixed in the fixing step so as to straddle a pair of side wall portions of a frame of the roller screen; The present invention provides a roller replacement method for a roller screen having the above structure.

[0020] This allows smooth connection and fixing of rollers and shafts that need replacement due to wear. Also, by connecting the rollers and shafts with multiple types of fixing means, the fastening force between the rollers and shafts can be ensured over a long period of time. [Effects of the Invention]

[0021] In this invention, as described above, both ends of the rollers of the roller screen are connected to a shaft that is rotated by a drive unit, and the ends of these rollers are positioned outside the inner surface of the side wall of the frame.This prevents wear on the shaft caused by small pieces or powder from the material to be treated, and reduces the cost of replacing the shaft.

[0022] In addition, the roller replacement method includes a connecting step of connecting a shaft to both ends of the roller, a fixing step of fixing the roller and shaft connected in the connecting step using one or more fixing means selected from bolts, washers, key members, pins, and welds, and an installation step of attaching the roller and shaft fixed in the fixing step so that they straddle a pair of side wall portions of the frame of the roller screen.This means that rollers that need replacement due to wear can be smoothly connected and fixed to the shaft, and the fastening force between the roller and shaft can be secured over a long period of time. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a cross-sectional view of one embodiment of a roller screen according to the present invention, seen from the front. [Figure 2] 2 is a cross-sectional view of the roller screen shown in FIG. 1 as seen from the side; [Figure 3] 2 is a cross-sectional view of the main part of the roller screen shown in FIG. 1, seen from the side; [Figure 4] Enlarged cross-sectional view of the main components in Figure 3 [Figure 5] (a) is a cross-sectional view taken along line aa in FIG. 4, (b) is a cross-sectional view taken along line bb in FIG. 4, and (c) is a cross-sectional view taken along line cc in FIG. 4. [Figure 6] FIG. 2 is a side view of the roller screen shown in FIG. 1 with a cutaway roller; [Figure 7] (a) is a cross-sectional view taken along line aa in Figure 6, and (b) is a cross-sectional view taken along line bb in Figure 6. [Figure 8] FIG. 2 is a cross-sectional side view of a main part of a modified example of the roller screen shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0024] An embodiment of a roller screen 1 according to the present invention will be described with reference to the drawings. As shown schematically in Figs. 1 and 2, this roller screen 1 is used to classify a material S to be treated, such as soil, crushed stone, ore, coke, and various other lumps and granules, and has a plurality of parallel rollers 11 that rotate in the same direction by driving force from an electric motor serving as a drive device 10. The rollers 11 are housed inside a frame 12. The frame 12 is a frame body with an open top. A pair of side walls 13 of the frame 12 support both axial ends of each roller 11 so that the roller 11 can rotate freely around its axis.

[0025] The frame 12 that supports the rollers 11 is supported by an underframe 14 installed on the floor F. One end of the frame 12 can be raised and lowered by a lifting device 15, and the other end can be rotated by a hinged fulcrum support part 16. When the rod of the lifting device 15 is extended, one end of the frame 12 rises, and the elevation angle α of the roller screen 1 with respect to the horizontal can be increased. On the other hand, when the rod of the lifting device 15 is shortened, one end of the frame 12 descends, and the elevation angle α can be reduced.

[0026] The drive unit 10 transmits rotation to the rollers 11 via pulleys 17 and belts 18. A chain (not shown) is stretched around sprockets 19 attached to the shaft ends of each roller 11, and the driving force of the drive unit 10 is transmitted to each roller 11 via this chain. A hopper 20 for temporarily storing the workpieces S before processing is provided at the upper end of one of the rollers 11 in the parallel direction. A sieving section 21 is provided below the parallel rollers 11, and a collection section 22 is provided below the other end of the parallel rollers 11 in the parallel direction. A gap w of a predetermined size is provided between adjacent rollers 11. Workpieces S smaller than the size of this gap w pass through this gap w and fall toward the sieving section 21, while larger workpieces S are transported by the rotating rollers 11 and then collected by the collection section 22. The workpieces S in the sieving section 21 and the collection section 22 are transported to predetermined locations by belt conveyors 23 and 24, respectively.

[0027] As shown in Figures 3 and 4, the roller 11 has a cylindrical main body 25 and end plates 26 that close both ends of the main body 25. An axially recessed recess 27 is formed in the center of the end face of the end plate 26. As shown in Figures 5(a) and 5(b), bolt holes 28 are formed at predetermined angular intervals in the circumferential direction on the outer periphery of the end plate 26. Furthermore, a key groove 29 of a predetermined depth is formed in the center of the recess 27 in the axial direction of the roller. The surfaces of the main body 25 and the end plates 26 (portions that may come into contact with small pieces or powder of the workpiece S) are treated with an anti-wear treatment. This anti-wear treatment reduces wear of the roller 11 due to small pieces or powder of the workpiece S. The main body 25 and the end plates 26 are integrated by means of welding or other means.

[0028] As shown in Figures 6 and 7(a), annular rings 30 are provided on the surface of the main body 25 of the roller 11 at predetermined intervals in the axial direction. These rings 30 protrude radially outward toward adjacent rollers 11. The amount of protrusion varies depending on the circumferential position (approximately 10 to 40 mm), and the rings 30 form a generally polygonal shape overall. There are no particular restrictions on the material of the rings 30, but in this embodiment, a quenched and tempered material is used.

[0029] The ring 30 of one adjacent roller 11 is arranged so as to face between the rings 30 of the other adjacent roller 11. In other words, the rings 30 of one roller 11 and the rings 30 of the other roller 11 are arranged so as to be staggered in the axial direction. This reduces the size of the substantial gap w between the rollers 11 compared to when the rollers 11 are not provided with rings 30, making it possible to control the size of the workpiece S that falls through the gap w between the rollers 11.

[0030] The shape of the ring 30 shown in this embodiment is merely an example, and it may be a circle with a constant protrusion amount at a circumferential position. Also, the rings 30 of adjacent rollers 11 may be positioned axially opposite each other.

[0031] 7(b), a lifter 31, which is V-shaped when viewed from the front and inclined with respect to the direction of rotation, is formed on the surface of the main body 25 of the roller 11. The height of this lifter 31 protruding from the surface of the main body 25 is, for example, 5 mm, which is relatively shorter than the protrusion amount of the ring 30. By forming this lifter 31, the workpiece S caught between the rollers 11 can be scraped out and dropped into the sieving section 21.

[0032] A shaft 32, which is driven to rotate by the drive unit 10, is disposed on both ends of the roller 11. As shown in FIG. 4, a flange 33 extends radially outward from the end of the shaft 32 facing the roller 11. As shown in FIGS. 5(a) to 5(c), the flange 33 is formed with bolt holes 34 corresponding to the positions of the bolt holes 28 formed in the end plate 26 of the roller 11. A tapped hole 35 is formed at a predetermined position on the flange 33, penetrating the flange 33 in the axial direction. A protrusion 36 is formed at the end of the shaft 32, which fits into a recess 27 formed in the end plate 26. A key groove 37 of a predetermined depth is formed in the center of the protrusion 36 in the axial direction. The shaft 32 is held rotatably about its axis by a bearing 38.

[0033] The roller 11 and shaft 32 are connected with a key member 39 inserted between a key groove 29 formed in an end plate 26 of the roller 11 and a key groove 37 formed in the end of the shaft 32, and are fixed by threading a bolt 40 into bolt holes 28, 34 formed in the end plate 26 and the flange 33, respectively. As shown in FIG. 5(c), the bolt 40 is provided with a washer 41 that spans multiple adjacent bolts 40 (two in this embodiment). This washer 41 is fan-shaped, and two through holes are formed in its surface for passing the bolts 40 through. When the bolts 40 are tightened, the bolts 40 and the washer 41 are welded to each other at a weld 42. Note that a washer 41 shaped to span three or more adjacent bolts 40 may also be used.

[0034] The key member 39 has a tapped hole 43 formed therein, which passes through the key member 39 in the axial direction. When the roller 11 and the shaft body 32 are connected, the end of the roller 11 is positioned outside the inner surface of the side wall portion 13 of the frame 12.

[0035] An annular sealing member 44 is interposed between the side wall portion 13 of the frame 12 and the outer peripheral surfaces of both ends of the roller 11. This sealing member 44 prevents small pieces or powder of the workpiece S inside the frame 12 from passing through the gap between the side wall portion 13 of the frame 12 and the roller 11 and reaching the shaft 32. In this embodiment, the entire axial length of the sealing member 44 is in contact with the outer peripheral surface of the roller 11, but it is also possible to configure the sealing member 44 so that only a portion of the axial length is in contact with the outer peripheral surface of the shaft 32.

[0036] A method for replacing rollers in a roller screen 1 according to the present invention will be described. First, the rollers 11 and shafts 32 are removed as a unit from the frame 12 of the roller screen 1. Next, the bolts 40 connecting the rollers 11 to the shafts 32 are removed. At this time, the welded portion 42 formed so as to straddle the bolts 40 and the washers 41 is removed by applying an external force. Next, a removal bolt (not shown) is screwed into the tapped hole 35 formed in the flange 33 of the shaft 32, and the tip of this removal bolt is abutted against the end face of the end plate 26 of the roller 11, and the resulting reaction force separates the roller 11 from the shaft 32.

[0037] When roller 11 and shaft body 32 are separated, key member 39, which was provided so as to be interposed between each of keyways 29, 37, is usually left behind on one of the keyways 29, 37. Therefore, a removal bolt (not shown) is screwed into tapped hole 43 formed in key member 39, and the tip of this removal bolt is abutted against the bottom of keyway 29 formed in end plate 26 of roller 11 or the bottom of keyway 37 formed in shaft body 32, and the resulting reaction force separates key member 39 from roller 11 or shaft body 32.

[0038] Once the roller 11 and shaft 32 have been separated in this manner, the worn roller 11 is replaced with a new roller 11. A key member 39 is then inserted between a key groove 29 formed in the end plate 26 of the roller 11 and a key groove 37 formed in the end of the shaft 32 to connect the roller 11 and the shaft 32. Washers 41 are then provided across two adjacent bolts 40 in bolt holes 28, 34 formed in the end plate 26 of the roller 11 and the flange 33 of the shaft 32, respectively, and the bolts 40 are screwed in to secure the roller 11 and the shaft 32. A weld 42 is then formed across the bolts 40 and the washers 41. Finally, the integrated roller 11 and shaft 32 are attached to the frame 12 of the roller screen 1, completing the roller 11 replacement process.

[0039] In the roller screen 1 described above, both ends of the roller 11 are connected to the shaft 32 that is driven to rotate by the drive unit 10, and the ends of the roller 11 are positioned outside the inner surface of the side wall 13 of the frame 12, so that small pieces or powder of the workpiece S transported within the frame 12 are less likely to reach the shaft. This prevents wear on the shaft 32 caused by small pieces or powder, and reduces the cost of replacing the shaft 32.

[0040] Furthermore, the roller screen 1 is configured such that a sealing member 44 is interposed between the side wall portion 13 and the end of the roller 11, thereby reliably preventing small pieces and powder from reaching the shaft body 32 and enhancing the wear prevention effect of the shaft body 32.

[0041] Furthermore, the roller screen 1 is configured such that the rollers 11 and shaft 32 are connected with bolts 40 and are prevented from rotating by key members 39 interposed between the rollers 11 and shaft 32. This makes it easy to connect and disconnect the rollers 11 and shaft 32, allowing for smooth assembly of the roller screen 1 and replacement of the rollers 11. In addition, the key members 39 provide an anti-rotation effect in addition to the fastening force of the bolts 40, so it is possible to reliably prevent problems such as the rollers 11 and shaft 32 spinning freely over time.

[0042] Furthermore, the roller screen 1 is provided with washers 41 that straddle a plurality of bolts 40, and welded portions 42 that straddle the bolts 40 and the washers 41 are formed, so that adjacent bolts 40 are prevented from rotating relative to each other via the washers 41, and loosening of the bolts 40 can be reliably prevented.

[0043] In addition, the roller screen 1 described above is configured such that the connection between the roller 11 and the shaft 32 by the bolt 40 is further strengthened by the washer 41, the weld 42, and the key member 39. However, by employing at least one other type of fixing means in addition to the bolt 40 (for example, the bolt 40 and the weld 42), it is possible to achieve an anti-rotation effect between the roller 11 and the shaft 32.

[0044] A modified example of the roller screen 1 described above is shown in Figure 8. This roller screen 1 has the same basic configuration as the above-mentioned one, but differs in that it uses a pin 45 instead of the key member 39. This pin 45 is inserted into a pin hole 46 formed in the end plate 26 of the roller 11 and a pin hole 47 formed in the flange 33 of the shaft body 32 corresponding to the position of this pin hole 46. Like the key member 39, this pin 45 is interposed between the roller 11 and the shaft body 32 and provides an anti-rotation effect. This reliably prevents problems such as the roller 11 and the shaft body 32 spinning freely over time.

[0045] In the roller screen 1 described above, both ends of the roller 11 are connected to the shaft 32 that is driven to rotate by a drive unit, and the ends of the roller 11 are located outside the inner surface of the side wall 13 of the frame 12. However, it is also possible to fix the roller 11 to the shaft 32 with one or more fixing means selected from bolts 40, washers 41, welded portions 42, key members 39, and pins 45, with the ends of the roller 11 located flush with or inside the inner surface of the side wall 13 of the frame 12. In this way, rollers 11 that need to be replaced due to wear can be smoothly connected and fixed to the shaft 32, and by connecting the roller 11 to the shaft 32 with multiple fixing means, the fastening force between the roller 11 and the shaft 32 can be ensured over a long period of time.

[0046] The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. Therefore, the scope of the present invention is defined by the claims, not by the above description, and is intended to include the meaning equivalent to the claims and all modifications thereof. [Explanation of symbols]

[0047] 1 Roller Screen 10 Drive unit 11 Laura 12 frames 13 Side wall 14 Frame 15 Lifting device 16 Fulcrum support part 17 Pulley 18 Belt 19 sprockets 20 Hopper 21 Screening section 22 Collection Department 23, 24 Belt conveyor 25 Main body 26 End plate 27 Recess 28 bolt holes 29 Keyway 30 Rings 31 Lifter 32 shaft body 33 flange 34 bolt holes 35 tapped holes 36 Protrusion 37 Keyway 38 Bearings 39 Key member 40 volts 41 Washer 42 Welded section 43 tapped holes 44 Sealing member 45-pin 46, 47 pin holes S Processing object F floor α elevation angle w gap

Claims

1. A plurality of rollers (11) arranged in parallel; a frame (12) that supports both axial ends of the rollers (11) with a pair of side walls (13) in a state in which the plurality of rollers (11) are housed therein so as to be rotatable around the axis of the rollers (11); and Both ends of the roller (11) are connected to a shaft (32) that is driven to rotate by a drive device (10), and the ends of the roller (11) are positioned outside the inner surface of the side wall portion (13).

2. 2. A roller screen according to claim 1, further comprising a sealing member (44) interposed between the side wall portion (13) and the end of the roller (11).

3. 3. A roller screen according to claim 1, wherein the roller (11) and the shaft (32) are connected by a bolt (40).

4. 4. The roller screen according to claim 3, wherein the bolt (40) is formed with a welded portion (42) for preventing the bolt (40) from rotating.

5. 5. The roller screen according to claim 4, wherein a washer (41) is provided across a plurality of the bolts (40), and the welded portion (42) is formed across the bolts (40) and the washer (41).

6. 4. A roller screen according to claim 3, wherein the roller (11) and the shaft (32) are prevented from rotating by a key member (39) or a pin (45) interposed between the roller (11) and the shaft (32).

7. a connecting step of connecting a shaft body (32) to both ends of the roller (11); a fixing step of fixing the roller (11) and the shaft (32) connected in the connecting step by one or more fixing means selected from a bolt (40), a washer (41), a key member (39), a pin (45), and a welded portion (42); an attachment step of attaching the roller (11) and the shaft (32) fixed in the fixing step to a pair of side wall portions (13) of a frame (12) of the roller screen (1) so as to straddle the pair of side wall portions (13); A roller replacement method for a roller screen having the above structure.

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