JP2023173178A - Roller screen and roller exchange method of roller screen - Google Patents

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

The present invention relates to a roller screen and a roller replacement method for a roller screen.

Roller screens are used to classify materials to be processed, such as various lumps and granules such as earth and sand, crushed stone, ore, and coke. For example, as shown in FIG. 1 of Patent Document 1 below, this roller screen includes a plurality of rollers arranged in parallel at predetermined intervals and rotated around an axis by a drive device. The object to be processed moves on the roller along the rotational direction of the roller. A gap of a predetermined size is formed between adjacent rollers, and objects smaller than this gap are screened out from between the rollers, while larger objects pass over the rollers and are removed. The processed materials are sieved according to their size.

The surface of the roller used in a roller screen is worn out by contact with the object to be processed. Therefore, the roller needs to be replaced when the amount of wear reaches a predetermined standard. Usually, a material with high wear resistance is used for the surface of this roller, and frequent replacement of the roller becomes expensive. 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 to the outer periphery of the roll core. Furthermore, by replacing only the wear-resistant cylindrical body when it wears out, the cost of the roller is suppressed. Furthermore, for example, in the configuration described in Patent Document 2 listed below, the roller is detachably attached to a shaft that rotatably supports the roller, so that only the roller can be replaced when it wears out. In these configurations, cost reduction is achieved by not using wear-resistant materials for shaft bodies such as roll cores and shafts.

Publication No. 3-51016 Japanese Patent Application Publication No. 9-1073

In both of the configurations described in Patent Documents 1 and 2, the roller and the shaft body can be separated, and only the roller can be replaced when worn, so that replacement costs can be reduced. However, in these configurations, particles and powder of the processed material accumulate in the gap between the inner end of the frame and the shaft, and the shaft, which has low wear resistance, wears out and must be replaced. The need arises and replacement costs may increase. Furthermore, in the configurations described in Patent Documents 1 and 2, the roller and the shaft are fixed by one type of fixing means such as a pin, a key member, a friction fastening member, or a bolt. With use, the fastening force may decrease and the roller and shaft may spin idly.

Therefore, it is an object of the present invention to suppress the cost of replacing members when they wear out, and to ensure the fastening force between the roller and the shaft body over a long period of time.

In order to solve the above problems, in this invention,
multiple rollers in parallel,
a frame that accommodates the plurality of rollers therein and supports both axial ends of the rollers with a pair of side walls so as to be rotatable around the axis of the roller;
has
Both ends of the roller were connected to a shaft body rotationally driven by a drive device, and the ends of the roller were arranged outside the inner surface of the side wall portion to constitute a roller screen.

This makes it difficult for the pieces and powder of the object to be processed that are transported within the frame to reach the shaft. Therefore, wear of the shaft body due to particles and powder is prevented, and the cost of replacing the shaft body can be suppressed.

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

In this way, it is possible to reliably prevent fine pieces and powder from reaching the shaft, thereby increasing the effect of preventing wear of the shaft.

In each of the above configurations,
It is preferable that the roller and the shaft body be connected with a bolt.

In this way, it becomes easy to connect and separate the roller and the shaft, and it is possible to assemble the roller screen and replace the roller smoothly.

In the configuration in which the roller and the bolt are connected by the bolt,
Preferably, the bolt is provided with a welded portion that prevents the bolt from rotating.

By doing so, it is possible to prevent troubles such as the bolt loosening over time and the roller and shaft rotating idly.

In the configuration in which the roller and the bolt are connected by the bolt,
It is preferable that a washer is provided spanning the plurality of bolts, and the welded portion is formed spanning the bolts and the washer.

In this way, adjacent bolts are prevented from rotating with each other through the washers, so that loosening of the bolts can be reliably prevented.

In the configuration in which the roller and the bolt are connected by the bolt,
Preferably, the roller and the shaft are prevented from rotating by a key member or a pin provided between the roller and the shaft.

In this way, in addition to the tightening force of the bolt, the locking effect of the key member or pin is exerted, so it is possible to reliably prevent troubles such as the roller and shaft spinning idly due to factors over time. can.

In addition, in order to solve the above problems, in this invention,
a connection process of connecting the shaft to both ends of the roller;
a fixing step of fixing the roller and the shaft body connected in the connecting step with a bolt, a washer, a key member, a pin, and one or more types of fixing means selected from a welding part;
an attachment step of attaching the roller and the shaft body fixed in the fixing step so as to straddle a pair of side wall portions of a frame of a roller screen;
A method for replacing the rollers of a roller screen having the following configuration was constructed.

In this way, the roller and shaft body that need to be replaced due to wear can be smoothly connected and fixed. Moreover, by connecting the roller and the shaft body using a plurality of types of fixing means, the fastening force between the roller and the shaft body can be ensured over a long period of time.

In this invention, as described above, both ends of the roller of the roller screen are connected to a shaft that is rotationally driven by a drive device, and the ends of the roller are arranged outside the inner surface of the side wall of the frame. With this configuration, wear of the shaft body due to particles and powder of the object to be processed can be prevented, and the cost of replacing the shaft body can be suppressed.

Further, in the roller replacement method, the connection step includes a connecting step of connecting shaft bodies to both ends of the roller, and one or more types of fixing means selected from bolts, washers, key members, pins, and welded parts. a fixing step of fixing the roller and the shaft body connected in the fixing process; and an attachment step of attaching the roller and the shaft body fixed in the fixing process so as to straddle a pair of side walls of a frame of a roller screen. , the roller that needs to be replaced 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. be able to.

A sectional view of an embodiment of the roller screen according to the present invention, viewed from the front. A sectional view of the roller screen according to Figure 1 seen from the side. A cross-sectional view of the main parts of the roller screen according to Figure 1, viewed from the side. Enlarged sectional view of main components in Figure 3 (a) is a sectional view taken along line a-a in FIG. 4, (b) is a sectional view taken along line bb in FIG. 4, and (c) is a sectional view taken along line cc in FIG. 4. A partially cutaway side view of the roller of the roller screen shown in Figure 1 (a) is a sectional view taken along line a-a in Figure 6, and (b) is a sectional view taken along line bb in Figure 6. A sectional view of the main part of the modified example of the roller screen according to FIG. 1, viewed from the side.

An embodiment of a roller screen 1 according to the present invention will be described based on the drawings. As schematically shown in FIGS. 1 and 2, this roller screen 1 is used to classify materials S such as various lumps and granules such as earth and sand, crushed stone, ore, and coke. , has a plurality of parallel rollers 11 that rotate in the same direction by driving force from an electric motor as a drive device 10. The plurality of rollers 11 are housed inside the frame 12. The frame 12 is a frame body with an open upper side. Both ends of each roller 11 in the axial direction are supported by the pair of side wall portions 13 of the frame 12 so as to be rotatable around the axis of the roller 11 .

A frame 12 supporting the roller 11 is supported by an underframe 14 installed on the floor F. One end of the frame 12 is movable up and down by a lifting device 15, and the other end is rotatable by a fulcrum support 16 connected by a hinge. 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 is lowered, and the elevation angle α can be reduced.

Drive device 10 transmits rotation to roller 11 via pulley 17 and belt 18 . A chain (not shown) is wrapped around a sprocket 19 provided at the shaft end of each roller 11, and the driving force of the drive device 10 is transmitted to each roller 11 via this chain. A hopper 20 is provided above one end of the rollers 11 in the parallel direction to temporarily accommodate the workpiece S to be processed. Further, a sieving part 21 is provided at the lower part of the parallel rollers 11, and a collecting part 22 is provided at the lower part of the other end of the 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 fall through this gap w toward the sieving unit 21, and larger workpieces S are collected by the collection unit 22 after being conveyed by the rotating roller 11. be done. The objects S to be processed in the screening section 21 and the collecting section 22 are transported to predetermined locations by belt conveyors 23 and 24, respectively.

As shown in FIGS. 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, respectively. A recess 27 recessed in the axial direction is formed at the center of the end surface of the end plate 26 . As shown in FIGS. 5(a) and 5(b), bolt holes 28 are formed on the outer peripheral edge of the end plate 26 at predetermined angular intervals in the circumferential direction. Furthermore, a key groove 29 having a predetermined depth is formed in the center of the recess 27 in the roller axial direction. The surfaces of the main body portion 25 and the end plate 26 (portions that may come into contact with pieces or powder of the object to be treated S) are subjected to wear prevention treatment. This abrasion prevention treatment suppresses abrasion of the roller 11 caused by fine pieces and powder of the object S to be processed. The main body portion 25 and the end plate 26 are integrated by means such as welding.

As shown in FIGS. 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. This ring 30 projects radially outward toward the adjacent rollers 11. The amount of protrusion varies depending on the position in the circumferential direction (approximately 10 to 40 mm), and the overall shape is substantially polygonal. Although the material of the ring 30 is not particularly limited, a hardened and tempered material is used in this embodiment.

The ring 30 of one adjacent roller 11 is arranged so as to face between the rings 30 of the other adjacent roller 11. That is, the rings 30 of one roller 11 and the rings 30 of the other roller 11 are arranged alternately in the axial direction. As a result, compared to the case where the ring 30 is not provided on the rollers 11, the actual size of the gap w between the rollers 11 becomes smaller, and the size of the workpiece S falling from the gap w between the rollers 11 is reduced. can be controlled.

The shape of the ring 30 shown in this embodiment is merely an example; for example, the ring 30 may have a circular shape in which the amount of protrusion is constant at a circumferential position. Further, the axial positions of the rings 30 of adjacent rollers 11 may be opposed to each other.

As shown in FIG. 7(b), a lifter 31 is formed on the surface of the main body portion 25 of the roller 11 and has a V-shape when viewed from the front and is inclined with respect to the rotation direction. The height of the lifter 31 protruding from the surface of the main body 25 is, for example, 5 mm, which is relatively lower than the amount of protrusion 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 part 21.

A shaft body 32 that is rotationally driven by the drive device 10 is arranged at both ends of the roller 11 . As shown in FIG. 4, a flange 33 extends radially outward at the end of the shaft 32 facing the roller 11. As shown in FIG. Further, as shown in FIGS. 5(a) to 5(c), bolt holes 34 are formed in the flange 33 so as to correspond to the positions of the bolt holes 28 formed in the end plate 26 of the roller 11. A tapped hole 35 that passes through the flange 33 in the axial direction is formed at a predetermined position of the flange 33. A protrusion 36 that fits into a recess 27 formed in the end plate 26 is formed at the end of the shaft body 32 . A key groove 37 having a predetermined depth is formed in the center of the protrusion 36 in the axial direction. The shaft body 32 is held by a bearing 38 so as to be rotatable around the shaft.

The roller 11 and the shaft body 32 are connected with the key member 39 inserted between the key groove 29 formed in the end plate 26 of the roller 11 and the key groove 37 formed in the end of the shaft body 32. , by screwing bolts 40 into bolt holes 28 and 34 formed in the end plate 26 and flange 33, respectively. As shown in FIG. 5(c), the bolt 40 is provided with a washer 41 that spans over a plurality of (two in this embodiment) adjacent bolts 40. This washer 41 has a fan shape, and has two through holes formed in its surface for passing the bolt 40 therethrough. With the bolt 40 tightened, the bolt 40 and washer 41 are welded together at the weld portion 42. Note that this washer 41 may be shaped to span three or more adjacent bolts 40.

A tapped hole 43 is formed in the key member 39 and passes through the key member 39 in the axial direction. In a state where the roller 11 and the shaft body 32 are connected, the end portion of the roller 11 is disposed outside the inner surface of the side wall portion 13 of the frame 12.

An annular sealing member 44 is provided between the side wall portion 13 of the frame 12 and the outer circumferential surface of both ends of the roller 11 . This sealing member 44 prevents the pieces and powder of the workpiece S in the frame 12 from passing through the gap between the side wall 13 of the frame 12 and the roller 11 and reaching the shaft 32 . In this embodiment, the entire axial direction of the sealing member 44 is in contact with the outer circumferential surface of the roller 11, but a part of the sealing member 44 in the axial direction is in contact with the outer circumferential surface of the shaft body 32. A configuration in which they are in contact can also be used.

A method for replacing the rollers of the roller screen 1 according to the present invention will be explained. First, the roller 11 and shaft body 32 are removed from the frame 12 of the roller screen 1 while remaining integral. Next, the bolt 40 connecting the roller 11 and the shaft body 32 is removed. At this time, the welded portion 42 formed across the bolt 40 and washer 41 is removed by applying an external force. Then, a removal bolt (not shown) is screwed into the tapped hole 35 formed in the flange 33 of the shaft body 32, and the tip of this removal bolt is butted against the end surface of the end plate 26 of the roller 11, and the reaction force is The roller 11 and shaft body 32 are separated.

When the roller 11 and the shaft body 32 are separated, the key member 39 provided between the respective key grooves 29 and 37 is usually left behind on one of the key grooves 29 and 37 side. Therefore, a removal bolt (not shown) is screwed into the tapped hole 43 formed in the key member 39, and the tip of the removal bolt is inserted into the bottom of the keyway 29 formed in the end plate 26 of the roller 11, or The key member 39 is brought into contact with the bottom of the key groove 37 formed in the shaft body 32, and the reaction force thereof separates the key member 39 from the roller 11 or the shaft body 32.

After the roller 11 and shaft body 32 are separated in this manner, the worn roller 11 is replaced with a new roller 11. Then, a key member 39 is inserted between the key groove 29 formed in the end plate 26 of the roller 11 and the key groove 37 formed in the end of the shaft body 32 to connect the roller 11 and the shaft body 32. Washers 41 are provided in the bolt holes 28 and 34 formed in the end plate 26 of the roller 11 and the flange 33 of the shaft body 32, respectively, so as to span two adjacent bolts 40, and the bolts 40 are screwed into the bolt holes 28 and 34, respectively. The shaft body 32 is fixed. Then, a welded portion 42 is formed so as to span the bolt 40 and washer 41. Finally, the integrated roller 11 and shaft body 32 are attached to the frame 12 of the roller screen 1 to complete the replacement work of the roller 11.

In the roller screen 1 described above, both ends of the roller 11 are connected to a shaft body 32 that is rotationally driven by a drive device 10, and the ends of the roller 11 are located outside the inner surface of the side wall portion 13 of the frame 12. Because of this arrangement, it becomes difficult for the pieces and powder of the workpiece S conveyed within the frame 12 to reach the shaft body. Therefore, wear of the shaft body 32 due to particles and powder is prevented, and the cost of replacing the shaft body 32 can be suppressed.

Further, since the roller screen 1 described above has a structure in which a sealing member 44 is interposed between the side wall portion 13 and the end of the roller 11, fine particles and powder are surely prevented from reaching the shaft body 32. Therefore, the effect of preventing wear of the shaft body 32 can be enhanced.

Further, the roller screen 1 described above has a structure in which the roller 11 and the shaft body 32 are connected with a bolt 40, and the rotation is prevented by a key member 39 interposed between the roller 11 and the shaft body 32. Therefore, the roller 11 and the shaft body 32 can be easily connected and separated, and the assembly of the roller screen 1 and the replacement of the roller 11 can be performed smoothly. Since the anti-rotation effect is exhibited, troubles such as the roller 11 and shaft body 32 spinning idly due to factors over time can be reliably prevented.

In addition, the roller screen 1 described above is provided with washers 41 that span the plurality of bolts 40 and then has welded portions 42 that span the bolts 40 and washers 41, so that adjacent bolts 40 can be connected to each other through the washers 41. The rotation of the bolt 40 can be prevented, and loosening of the bolt 40 can be reliably prevented.

The roller screen 1 described above has a structure in which the connection between the roller 11 and the shaft body 32 by the bolts 40 is further strengthened by the washer 41, the welded portion 42, and the key member 39, but in addition to the bolts 40, at least By employing one or more types of fixing means (for example, bolts 40 and welded portions 42), the effect of preventing rotation of the roller 11 and shaft body 32 can be exhibited.

A modification of the roller screen 1 described above is shown in FIG. This roller screen 1 has the same basic structure as the one described above, but is different in that a pin 45 is used 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 also interposed between the roller 11 and the shaft body 32, and exhibits a rotation prevention effect. Therefore, troubles such as idle rotation of the roller 11 and shaft body 32 due to factors over time can be reliably prevented.

In the roller screen 1 described above, both ends of the roller 11 are connected to a shaft 32 that is rotationally driven by a drive device, and the end of the roller 11 is arranged outside the inner surface of the side wall 13 of the frame 12. However, with the end of the roller 11 disposed on the same surface or inside the inner surface of the side wall portion 13 of the frame 12, the bolt 40, washer 41, welded portion 42, key member 39, and pin 45 are removed. It is also possible to fix the roller 11 and the shaft body 32 using one or more selected types of fixing means. In this way, the roller 11 that needs to be replaced due to wear can be smoothly connected and fixed to the shaft body 32, and by connecting the roller 11 and the shaft body 32 with a plurality of fixing means, it can be used for a long period of time. The fastening force between the roller 11 and the shaft body 32 can be ensured throughout the period.

The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. Therefore, the scope of the present invention is indicated by the claims rather than the above description, and it is intended that equivalent meanings and all modifications to the claims are intended to be included.

1 Roller screen 10 Drive device 11 Roller 12 Frame 13 Side wall portion 14 Underframe 15 Lifting device 16 Fulcrum support portion 17 Pulley 18 Belt 19 Sprocket 20 Hopper 21 Sieving portion 22 Collection portions 23, 24 Belt conveyor 25 Main body portion 26 End plate 27 Recessed portion 28 Bolt hole 29 Keyway 30 Ring 31 Lifter 32 Shaft 33 Flange 34 Bolt hole 35 Tapped hole 36 Projection 37 Keyway 38 Bearing 39 Key member 40 Bolt 41 Washer 42 Welded part 43 Tapped hole 44 Sealing member 45 Pin 46, 47 Pin hole S Workpiece F Floor α Elevation angle w Gap

Claims (7)

A plurality of parallel rollers (11);
A frame (12) that supports both axial ends of the roller (11) with a pair of side walls (13) so as to be rotatable around the axis of the roller (11), with the plurality of rollers (11) housed therein. )and,
has
Both ends of the roller (11) are connected to a shaft (32) that is rotationally driven by a drive device (10), and the end of the roller (11) is lower than the inner surface of the side wall (13). Roller screen placed on the outside. A roller screen according to claim 1, further comprising a sealing member (44) interposed between the side wall (13) and the end of the roller (11). The roller screen according to claim 1 or 2, wherein the roller (11) and the shaft (32) are connected by a bolt (40). The roller screen according to claim 3, wherein the bolt (40) is formed with a welded portion (42) that prevents the bolt (40) from rotating. A washer (41) is provided that spans a plurality of the bolts (40), and the welded portion (42) is formed to span the bolt (40) and the washer (41). roller screen. 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). 4. The roller screen according to claim 3. a connecting step of connecting the shaft (32) to both ends of the roller (11);
Connected in the connecting step by the bolt (40) and one or more types of fixing means selected from the washer (41), the key member (39), the pin (45), and the welding part (42). a fixing step of fixing the roller (11) and the shaft (32);
an attachment step of attaching the roller (11) and the shaft body (32) fixed in the fixing step so as to straddle a pair of side wall portions (13) of the frame (12) of the roller screen (1);
A roller replacement method for a roller screen having a roller screen.

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