JP4837766B2 - Drum screen - Google Patents

Description

  The present invention relates to a drum screen suitable for sieving, for example, a highly moisture and highly viscous substance such as soil and mud.

  Conventionally, a rotary sieving device called a so-called drum screen has a plurality of rods arranged in a cylindrical shape at a predetermined interval to form a cylindrical screen having a sieving function, on both sides of the cylindrical screen. Cylindrical portions for supporting the screen are provided on the same central axis, and the screen is supported by the supporting rollers in the cylindrical portions on both sides, and a driven sprocket is provided on the outer periphery of one cylindrical portion. There has been proposed one in which an endless chain is hung between sprockets and a cylindrical screen is rotated through the cylindrical portion (Patent Document 1).

  In addition, a drum screen has been proposed in which a rod-shaped member is provided on the rod of the drum screen, and the mesh of the rod is formed by the rod-shaped member (Patent Document 2).

JP 2002-113422 A JP-A-2005-342583

  By the way, in the drum screen of the said patent document 2, when the collar member was worn out, it was necessary to replace | exchange rod itself and there existed a subject in maintainability.

  In addition, since the rod-like member is directly fixed to the rod itself, it is difficult to replace only some of the rod-like members in one rod, for example.

  The present invention has been made in view of the above-described conventional problems. By making a rod cladding tube having a ring-shaped member detachable from the rod, it is possible to facilitate the replacement of the cladding tube when the ring-shaped member is worn, and to perform maintenance. The purpose is to realize a drum screen with improved performance.

In order to achieve the above object, the present invention
First, a pair of bearing annular frames are arranged on a common central axis, a plurality of bearing holes are provided at predetermined intervals in the circumferential direction of each annular frame, and both ends of the rod are inserted into each bearing hole of both frames. A drum in which a plurality of rods are arranged in a cylindrical shape having the common central axis together to form a cylindrical screen, and the cylindrical screen is rotatably supported on a base frame. The screen is provided with a rod cladding tube capable of covering the outer periphery of the rod, and one or more ring-shaped members are fixed to the outer periphery of the rod cladding tube, and the rod outer tube is covered with the rod cladding tube. The ring-shaped members in the adjacent rods are arranged in a staggered manner, and the ring-shaped members are configured to overlap in the axial direction of the rods. Constituted by the drum screen, characterized in that is obtained by constituting the sieve by wood.

  If comprised in this way, when a ring-shaped member is worn out etc., it is only necessary to replace the rod cladding tube, so there is no need to replace the rod itself. Moreover, since the rod is covered with the rod covering member, the service life of the rod can be improved.

  Secondly, the rod cladding tube is configured by the drum screen according to the first aspect, which can be attached to the outer periphery of the rod from the end of the rod and can be removed from the end of the rod.

  If comprised in this way, it becomes possible to attach or detach a rod cladding tube easily to a rod, and can improve maintenance property, such as replacement | exchange of a rod cladding tube.

  Third, the length of the rod cladding tube is configured to be shorter than the length of the single rod, and the single rod is covered with a plurality of rod cladding tubes. The drum screen according to the first or second aspect is provided.

  If comprised in this way, only the rod cladding tube which comprises the worn ring-shaped member can be replaced | exchanged partially, and maintainability can be improved.

  4thly, it comprises the drum screen in any one of said 1st-3rd which forms a square sieve mesh by the ring-shaped member arranged in parallel with the said rod cladding tube adjacent to the circumferential direction. Is done.

  If comprised in this way, the product with uniform particle size can be screened correctly, and the quality of a product can be improved. A square means a square shape such as a square or a rectangle.

The invention as described above, by the ring-shaped member is staggered by a plurality of rods cladding, with can improve the quality of products to form a sieve of square shape by the ring-shaped member, When the ring-shaped member is worn, it is only necessary to replace the rod-coated tube having the worn ring-shaped member among the plurality of rod-coated tubes, and it is not necessary to replace the rod itself. A screen can be realized.

1 is a schematic side view of a drum screen according to the present invention. It is the X1-X1 sectional view taken on the line of FIG. It is a side view which shows the cyclic | annular frame of a screen same as the above. It is a front view of the support part vicinity of a rod which shows the support state of the protrusion edge of the rod of a screen same as the above. It is a fragmentary sectional view of the rod tip vicinity which shows the support state of the rod of a screen same as the above. It is a perspective view which shows the cladding tube and rod which are used for a screen same as the above. It is a figure which shows the state which mounts the cladding tube used for a screen same as the above to a rod, (a) (b) is a state which inserts a rod, (c) is a figure which shows the state which mounted | wore the cladding tube to the rod. It is a partial side view of the drum screen which shows the state which mounted | wore the rod with the cladding tube used for a screen same as the above. It is X2-X2 sectional drawing of FIG. It is a figure which shows the intermediate bearing cyclic | annular flame | frame of a screen same as the above. It is a figure which shows the bearing annular frame of the back side of a screen same as the above.

  Hereinafter, a drum screen according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, the raw material input side (the guide ring 8 side in FIG. 1) of the drum screen 1 is the front side, and the outlet side (the small diameter cylinder 7 side in FIG. 1) is the rear side. In this state, the rotation roller 14a side is the left and the rotation roller 14b side is the right (see FIG. 2).

  FIG. 1 is a side view of a drum screen 1 according to the present invention. A cylindrical screen 5 of the drum screen 1 has the following configuration.

  That is, the cylindrical screen 5 includes a plurality of rods 2 and 2 ′ arranged in a cylindrical shape having a central axis (common central axis) P <b> 1 at a predetermined interval, and an intermediate between these rods 2 and 2 ′. Intermediate bearing annular frames 3, 3 (see FIG. 2) for supporting the parts, both end bearing annular frames 4, 4 ′ (see FIG. 3) for supporting both ends of the rods 2, 2 ′, and the both end bearing annular frames Front and rear roller receiving rings 6 and 6 'provided concentrically with the central axis P1 and integrally with the annular frames 4 and 4' on the outer peripheral surface of each of 4 and 4 ', and the rear bearing annular frame 4 is fixed to the rear plate surface 4a by a bolt B1 with a horizontal disk 7a, and protrudes in the outlet direction behind the screen 5 concentrically with the central axis P1, and the front bearing ring. Horizontal circle on front side plate surface 4a 'of frame 4' 8a is bolted B1 drives out, is constituted by a guide ring 8 projecting at the inlet side of the screen 5 concentrically with the center axis P1 (see FIG. 3).

  The rods 2 and 2 'include a cylindrical fixed rod 2' having a circular cross section and a prismatic floating rod 2 having a square cross section (see FIGS. 2, 5, and 6). The floating rod 2 is mounted with a rod-clad tube 60 with a ring which will be described later (FIGS. 5 and 6). Five fixed rods 2 'are provided for each fixed angle of the annular frames 4 and 4' (see FIG. 2), and these rods 2 'penetrate each fixed angle of the intermediate bearing annular frames 3 and 3. The five bearing holes 4b and 4b ′ are fixed to the five bearing holes 3a provided (see FIGS. 2 and 10), and penetrated through the both-end bearing annular frames 4 and 4 ′ at a predetermined angle. Both end portions are fixed to each other (see FIGS. 3 and 11). 11 shows the bearing annular frame 4 on the rear side, the bearing annular frame 4 'on the front side has the same configuration.

  Between the bearing holes 3a of the intermediate bearing annular frames 3 and 3, a plurality of circular bearing holes 9 (in this embodiment, 5 or 6 between the bearing holes 3a, for every predetermined angle (every predetermined interval in the circumferential direction), A total of 28 pieces are provided in the circumferential direction (see FIGS. 2 and 10), and similarly between the bearing holes 4b of the both-end bearing annular frames 4 and 4 ′ at a certain angle (in the circumferential direction). A plurality of circular bearing holes 9 (five or six, a total of 28 between the bearing holes 4b in this embodiment) are provided at predetermined intervals) (FIGS. 3 and 11). The floating rods 2 are respectively inserted into the holes 9.

  In addition, on the surface of the horizontal disks 7a and 8a, bearing holes 7c for inserting and fixing both end portions of the fixing rod at positions corresponding to the bearing holes 4b and 4b 'are provided so as to penetrate the bearing holes 7c. In the meantime, small-diameter bearing holes 10 for loosely inserting and supporting the small-diameter protruding shafts 2 ″ at both ends of the floating rod 2 correspond to the bearing holes 9 at every predetermined angle (at a predetermined interval in the circumferential direction) (this embodiment) In the form, five or six, a total of 28) are provided between the bearing holes 7c (see FIGS. 4 and 5).

  The circular bearing holes 9 of the intermediate bearing annular frames 3 and 3 and the both end bearing annular frames 4 and 4 '(see FIGS. 3 and 10) are larger than the width of the floating rod 2 (diagonal line with a square cross section). The floating rod 2 has a diameter (see FIG. 4), and the floating rod 2 is loosely inserted into the bearing holes 9 of the intermediate bearing annular frames 3 and 3 and the both end bearing annular frames 4 and 4 ', respectively, and the both end protruding shafts thereof. 2 "is inserted into the small-diameter bearing holes 10 provided in the front and rear horizontal disks 7a and 8a, respectively, and both end portions (both-end protruding shafts 2") are pivotally supported by the small-diameter bearing holes 10 ( (See FIG. 5).

  Each of the small diameter bearing holes 10 of the horizontal disks 7a, 8a at both ends also has a diameter larger than the diameter of the protruding shaft 2 ″ at both ends of the rod 2, so that the protruding shaft 2 ″ at both ends of the rod 2 is The small-diameter bearing hole 10 is loosely supported with a predetermined gap t (see FIG. 5). Therefore, these floating rods 2 are configured such that they can vibrate, rotate, etc. within the range of the gap t when the cylindrical screen 5 rotates in the direction of arrow A about the central axis P1.

  As shown in FIG. 3, the roller receiving ring 6 on the rear side is integrally formed with an annular rib 6b for preventing wheel removal protruding in the outer circumferential direction on the rear side of the flat roller support surface 6a over the entire circumference. The cross section is substantially L-shaped. Further, the roller receiving ring 6 ′ on the front side has a symmetrical shape with the roller receiving ring 6 on the rear side, and an annular rib 6b ′ for preventing wheel removal protruding in the outer peripheral direction on the front side of the roller support surface 6a ′. It is integrally formed over the entire circumference and similarly has a substantially L-shaped cross section.

  Further, annular ring 11 and 11 'for preventing wheel removal are similarly fixed concentrically by bolts B2 on the opposite side surfaces of both roller receiving rings 6 and 6', and the roller support surfaces 6a and 6a '. Are configured to be prevented from being removed in the front-rear direction by the annular ribs 6b, 6b ′ and the annular rings 11, 11 ′.

  In the intermediate bearing annular frames 3 and 3 and the rear bearing annular frame 4, an annular dam plate 12 for increasing the material passage time of the raw material supplied into the screen is provided with a bolt B 3 concentrically with the central axis P 1. Is fixed.

  Next, the drive system of the cylindrical screen 5 configured as described above will be described.

  The underframe 13 on which the cylindrical screen 5 is placed has a downward inclination angle from the front side to the rear side (see FIG. 1). As shown in FIG. 1, two front and rear rotating rollers 14a and 14a having the same central axis P2 parallel to the central axis P1 (parallel to the tilt direction of the frame 13) have two front and rear bearing portions 15a, Each is rotatably supported by 15a. The bearing portions 15a and 15a are respectively fixed to two front and rear support legs 15 and 15 provided at a high position and a low position of the frame 13, respectively.

  Further, at the symmetrical position of the rotary rollers 14a, 14a on the left side on the frame 13, the rotary roller is provided with the same central axis P3 parallel to the central axis P1 (parallel to the tilt direction of the frame 13). Two front and rear rotating rollers 14b and 14b having the same diameter as 14a and 14a are rotatably supported by two front and rear bearing portions (not shown) similar to the bearing portions 15a and 15a, respectively (see FIG. 2). ). Further, the two front and rear bearing parts are symmetrical positions of the bearing parts 15a and 15a and the two front and rear support legs similar to the support legs 15 and 15 provided at the high position and the low position of the underframe 13 (see FIG. (Not shown).

  Further, the rotation shafts of the left and right rotation rollers 14a and 14a are connected to each other by a connecting shaft 16 on the center axis P2 (FIG. 1), and the rotation shafts of the right rotation rollers 14b and 14b are on the center axis P3. The left and right rollers 14a and 14a and the right and left rollers 14b and 14b are configured to be simultaneously rotated by the connecting shafts 16 and 16 '. Yes.

  Accordingly, the central axes P2 and P3 and the connecting shafts 16 and 16 'of the left rotating rollers 14a and 14a and the right rotating rollers 14b and 14b have the same inclination angle as the inclination angle of the upper surface 13a of the frame. It is inclined from the front side to the rear side (see FIG. 1), and when the cylindrical screen 5 is placed on these four rollers, the central axis P1 of the screen 5 and the central axis of each of the rollers P2 and P3 are configured to be parallel with the same inclination angle.

  The distance T between the center axis P2 of the left rotation rollers 14a and 14a and the center axis P3 of the right rotation rollers 14b and 14b is set on the left and right rotation rollers 14a and 14b on the front side and the left and right rotation rollers 14a and 14b. The intervals are set so that the front and rear roller receiving rings 6 and 6 'of the drum screen 1 can be placed on the rotating rollers 14a and 14b, respectively.

  Therefore, when the drum screen 1 is placed on the left and right rotating rollers 14a and 14b on the front side and the left and right rotating rollers 14a and 14b on the rear side, the left and right sides of the roller support surface 6a 'of the front roller receiving ring 6' The outer peripheral surfaces of the front left and right rotating rollers 14a and 14b are in contact with the positions, and the outer peripheral surfaces of the rear left and right rotating rollers 14a and 14b are in contact with the left and right positions of the roller support surface 6a of the rear roller receiving ring 6. Thus, the drum screen 1 can be placed on the front and rear rotating rollers 14a and 14b at a tilt angle that is the same as the tilt angle of the frame 13 and tilted backward. (See FIG. 1).

  Further, the rotating shaft of the rotating roller 14a on the front side is connected to the driving shaft of the driving motor M via the bearing portion 15a, and the rotating shaft of the rotating roller 14b on the right rear side is the driving shaft M (see FIG. The cylindrical screen 5 can be rotationally driven in the direction of arrow A with the central axis P1 as the center of rotation by rotationally driving the drive motor M in the same direction at the same speed. Has been.

  A product conveying conveyor 20 is provided below the cylindrical screen 5 to convey the product dropped from the cylindrical screen 5 forward (in the direction of arrow B) (see FIG. 1). Further, a product transport conveyor 21 is provided on the lower surface of the exit side of the small-diameter cylindrical portion 7 on the rear side of the cylindrical screen 5, and the product discharged from the exit side of the cylindrical screen 5 is laterally (in the direction of arrow C). (Refer to FIG. 2).

  Reference numeral 22 denotes a casing that covers the outside of the cylindrical screen 5 and the like, and includes a screen casing 22 a that covers the entire outside of the cylindrical screen 5, and a rear-side casing that covers the small-diameter cylindrical portion 7 and the conveyor 21 on the rear side of the screen 5. The front side is formed with an opening to expose the guide ring 8. The casing 22 has a lower end periphery fixed to the top surface 13a of the frame 13.

  6 shows a rod-coated tube with a ring (rod-coated tube with a ring) 60 for making the sieve mesh formed by the floating rod 2 of the drum screen 1 into a square (rectangle such as a rectangle or a square), and The ring-shaped member 61 is shown. The ring-equipped rod-coated tube 60 has a rectangular tube shape with a rectangular cross section that can be coated on the outer periphery of the floating rod 2, and one or two ring-shaped members 61 are bonded (or welded) to the outer periphery thereof. ) It is fixed. The rod covering tube 60 has a single length that is shorter than the length of the rod 2, and is configured so that substantially the entire rod 1 can be covered by the three rod covering tubes 60. Yes. The rod cladding tube 60 has a quadrangular cross section, but if the rod cross section is circular, it is configured in a cylindrical shape.

  The ring-shaped member 61 is made of, for example, hard rubber. The overall shape is a disk shape, but a square-shaped opening 61a for inserting a rod cladding tube is provided through the center, and the opening 61a has the opening 61a. By being inserted into the rod cladding tube 60, it is fixed to the cladding tube 60 by adhesion or welding.

  This ring-shaped member 61 forms two types, one provided at the center of one rod cladding tube 60 and two provided at a predetermined interval on one rod cladding tube 60.

  As shown in FIG. 8, each of the rod cladding tubes 60 includes a distance between the bearing annular frame 4 ′ on the front side of the drum screen 1 and the intermediate bearing annular frame 3, a distance between the intermediate bearing annular frames 3, 3, It has a length that can be attached to the rods 2 and 2 at a distance between the bearing annular frame 3 and the rear bearing annular frame 4.

  8, the ring-shaped members 61 and 61 of the rods 2 and 2 adjacent in the circumferential direction form an overlapping portion K where the ring-shaped members 61 and 61 overlap each other when viewed in the axial direction of the rods. (See FIG. 9). The diameter of the ring-shaped member 61 is formed to a length that does not contact the rod covering tube 60 of the adjacent rod 2 when the rod covering tube 60 is attached to the floating rod 2 (see FIG. 8).

  Therefore, in the floating rods 2 and 2 adjacent to each other in the circumferential direction, the rod cladding tube 60 provided with one ring-shaped member 61 and the rod cladding tube 60 provided with two ring-shaped members 61 are alternately arranged. By mounting (see FIG. 8), in the drum screen 1, the ring-shaped members 61 are arranged in a zigzag manner (see FIGS. 1 and 8). Can be formed (see FIG. 8).

  Note that how many ring-shaped members 61 are provided in one rod cladding tube 60 can be set by the object to be sieved, and a sieve mesh smaller than the embodiment of FIG. 9 (for example, a square mesh mesh) is formed. In this case, a larger number of ring-shaped members 61 (for example, a rod-coated tube provided with two ring-shaped members and a rod-coated tube provided with three ring-shaped members) may be provided on the rod-coated tube 60. it can. A square sieve mesh is also formed between the ring-shaped member 61 and the intermediate bearing annular frame 3.

  In order to mount the rod covering tube 60 on the rod 2, the covering tube 60 is arranged in advance at each mounting position before inserting the rod 2 (FIGS. 7A and 7B), and the front bearing The rod 2 may be inserted through the bearing hole 9 on the annular frame 4 ′ side. Then, the rod 2 has a rod covering tube 60 between the bearing annular frame 4 'on the front side and the intermediate bearing annular frame 3, a rod covering tube 60 between the intermediate bearing annular frames 3 and 3, the intermediate bearing annular frame 3 and the rear side. Are inserted into the rod cladding tube 60 between the bearing annular frame 4 on the side and the protruding shaft 2 ″ at the tip thereof is inserted into the small diameter bearing hole 10 of the horizontal disk 7a through the bearing hole 9 of the bearing annular frame 4. Insertion is supported (see FIGS. 5 and 7C).

  7 (c) and 8, the protruding shaft 2 "on the front side of the rod 2 is also loosely supported by the small-diameter bearing hole 10 of the horizontal disk 8a. The horizontal disks 7a and 8a at the both ends. As shown in FIG. 5, the small-diameter bearing hole 10 and the protruding shafts 2 ″ at both ends have a gap t, and the rod 2 and the bearing holes 9 of the intermediate annular bearing frames 3 and 3 also have a gap. Therefore, even when the rod cladding tube 60 is mounted, each of the floating rods 2 itself can oscillate and rotate (moves) in the range of the gap t, and exhibits a crushing effect and a deposit peeling effect. can do.

  Then, as shown in FIG. 1, rod covering tubes 60 are attached to all the floating rods 2 of the drum screen 1, and the ring-shaped members 61 are arranged in a staggered manner, whereby a rectangular sieve is obtained as shown in FIG. The eyes S can be formed.

  Since the present invention is configured as described above, the operation of the drum screen 1 according to the present invention will be described next.

  It is assumed that the drum screen 1 is installed on the frame 13 in a state of being inclined rearward as shown in FIG.

  In this state, the drive motor M is driven at the same speed in the same direction. Then, the rotating rollers 14a and 14b are rotationally driven through the connecting shafts 16 and 16 ', whereby the cylindrical screen 5 rotates in the direction of arrow A.

  In this state, when a raw material containing soil, mud or the like is introduced from the raw material inlet 23 in front of the cylindrical screen 5, the raw material is sieved while colliding with the floating rod 2 in the cylindrical screen 5, and the weir plate 12 Soil, mud, and the like are gradually removed while dammed by the nozzle and move toward the outlet 24. In the course of the sieving operation, the gap between the ring-shaped members 61, 61 of the rod cladding tube 60 (sieve) Passable stones (products) fall downward and are conveyed in the direction of arrow B by the conveyor 20. Stone larger than the gap between the floating rods 2 and 2 is discharged from the outlet 24 of the cylindrical screen 5 and supplied onto the conveyor 21 via the small diameter cylindrical portion 7 and is conveyed in the direction of arrow C by the conveyor. The

  Since the rod cladding tube 60 is attached to the rod 2, the frame 4 ', 3 and 4 can be rattled and vibrated and rotated (moved) (see FIG. 5). High quality products can be sieved by the sieve mesh S. That is, when the cylindrical screen 5 is rotated, an object longer than the square sieve mesh S is not screened out by the square sieve mesh S, and a product of good quality can be sieved.

  When the ring-shaped member 61 is worn, the rod 4 is removed from the front bearing annular frame 4 ′ side, the rod cladding tubes 60 are removed, and a new ring-shaped member 61 is provided. It is only necessary to mount the rod covering tube 60 at a predetermined position, insert the rod 2 again, and cover the outer periphery of the rod 2 at each position.

  Further, the rod cladding tube 60 can be replaced by, for example, only a part of the rod cladding tube 60 provided with the worn ring-shaped member 61.

  As described above, in the drum screen 1 according to the present invention, the cylindrical screen 5, each rotation roller, and the drive motor M are compactly arranged on the frame 13, and all are mounted on the single frame 13. For example, by providing a crawler or the like on the underframe 13, the drum screen itself can be configured to be able to run on its own.

  Further, since the weight of the drum screen can be reduced by reducing the size of the entire drum screen, the required power can be greatly reduced.

  Further, the bearing annular frames 4, 4 'at both ends and the roller receiving rings 6, 6' at both ends can be integrated, and the cylindrical screen 5 can be further downsized.

  In addition, by attaching the rod cladding tube 60 having the ring-shaped member 61 to the rod 2 in a detachable manner, a square sieve mesh S can be formed, thereby improving the quality of the product.

  Further, since the rod cladding tube 60 provided with the ring-shaped member 61 is configured to be attached to or removed from (attached to or detached from) the rod 2, when the ring-shaped member 61 is worn, the rod having the worn ring-shaped member. Only the cladding tube 60 needs to be replaced, and it is not necessary to replace the entire rod 2, so that maintenance is good.

  In addition, since the rod cladding tube 60 covers the rod 2, it can function as a protective material for the rod 2 itself, and the service life of the rod 2 can be improved.

  As described above, by mounting the rod cladding tube 60, it is possible to select a very high quality product while being small in size, and the drum cladding tube 60 can be easily replaced and has a very good maintenance property. A screen can be realized.

  Further, when the ring-shaped member 61 is worn or the like, it is only necessary to replace the rod cladding tube 60, so there is no need to replace the rod 2 itself.

  Further, the rod 2 can be easily attached to and detached from the rod cladding tube 60, and maintenance properties such as replacement of the rod cladding tube 60 can be improved.

  Further, only the rod cladding tube 60 having the worn ring-shaped member 61 can be partially replaced, and the maintainability can be improved.

  In addition, products with uniform particle sizes can be accurately screened, and the quality of the screened products can be improved.

  In FIG. 1 and FIG. 3, reference numeral 62 denotes a cleaner plate provided inside the small diameter cylindrical portion 7. The elastic plate 63 is disposed inside the cylindrical portion 7 so as to adhere to the inside of the small diameter cylindrical portion 7. Scraping off mud and so on. The cleaner plate 62 is fixed to a frame 65 installed on the underframe 13 via support legs 64.

  The drum screen according to the present invention can select a high-quality product and can be used not only as a fixed drum screen, but also can be mounted on a crawler to be self-propelled or can be mounted on a track and moved. This makes it possible to dramatically increase the place of use.

1 Drum screen 2 Floating rod 2 'Fixed rod 2 "Both end protruding shafts 4, 4' Both end bearing annular frame (bearing annular frame)
4b Bearing hole 5 Cylindrical screen 6, 6 'Roller receiving ring 6a, 6a' Roller support surface 9 Bearing hole 13 Base frame 14a, 14b Rotating roller 16, 16 'Connection shaft 60 Rod cladding tube 61 Ring-shaped member P1 Central shaft ( Common central axis)
P2, P3 central axis

Claims (3)

A pair of bearing annular frames are arranged on a common central axis, a plurality of bearing holes are provided at predetermined intervals in the circumferential direction of each annular frame, and both ends of the rod are loosely inserted into the bearing holes of the both frames. By supporting, a plurality of rods are arranged in a cylindrical shape with the common central axis together to form a cylindrical screen,
In the drum screen formed by rotatably supporting the cylindrical screen on the underframe,
The rod is composed of a prismatic floating rod,
A rod cladding tube having a rectangular tube shape with a rectangular cross section capable of covering the outer periphery of the rod is provided, and the length of the rod cladding tube is configured to be shorter than the length of one rod. The rod is configured to be covered with a plurality of the rod cladding tubes,
One or more ring-shaped members are fixed to the outer periphery of the single rod cladding tube,
When the rod-coated tube is coated on the outer periphery of each rod , the ring-shaped member covers one rod-coated tube and the ring-shaped member on a plurality of rod-coated tubes on adjacent rods, The ring-shaped members in the adjacent rods are arranged in a staggered manner, and the ring-shaped members overlap in the axial direction of the rods,
A drum screen characterized in that a sieve mesh is formed by ring-shaped members adjacent in the axial direction of the rod.   2. The drum screen according to claim 1, wherein the rod cladding tube can be attached to the outer periphery of the rod from the end of the rod and can be removed from the end of the rod. The drum screen according to claim 1 , wherein a square sieve mesh is formed by a ring-shaped member provided in parallel with the rod cladding tube adjacent in the circumferential direction in the axial direction .

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