JP2015048585A - Screen device and processed material processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen device capable of ensuring a removal of foreign materials remained on a bar screen.SOLUTION: A screen device comprises: a bar screen 2 consisting of multiple bars 2A placed in parallel in a lateral direction to receive a processed material M put in from above; a vibration generator to vibrate the bar screen 2; an endless chain 4 placed above the bar screen 2; a rake 25 and a scraper 26 installed on the endless chain 4 to scrape foreign materials on the bar screen 2 from the upper side of the bar screen 2. The vibration generator operates to vibrate the bar screen 2 when the rake 25 and the scraper 26 are located at a position separated from the bar screen 2.

Description

  The present invention relates to a screen device and a processing method of a processed product using the same.

  Sediment and sludge dredged in river lakes and sewerage facilities are transported to treatment plants by dump trucks and vacuum damper vehicles, washed in sand-washing facilities and washed away with decaying organic matter, and then transported to an external landfill site. Is done. In general, since the earth and sand contain a lot of foreign substances, a process for removing the foreign substances is performed at a stage before being put into the sand washing facility.

As a method for removing foreign substances, conventionally, a method of removing foreign substances by human power while washing the earth and sand with running water is often used. However, this method is a work in an unsanitary field environment, and it is a considerable labor burden for the operator.
To deal with this problem, Patent Document 1 describes a processing apparatus having a screen for the purpose of separating sand and sediment.

JP 2011-235275 A

  The technique described in Patent Document 1 has a structure in which, when removing the residue (contamination) remaining on the screen, the screen is tilted downward to cause the residue to fall from the screen by its own weight and be collected in a container. However, since many foreign substances that are easily entangled with the screen, such as string-like materials, are included in the method of removing residue by falling under its own weight described in Patent Document 1, some of the residue remains on the screen. May remain and gradually accumulate and cause clogging of the screen.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a screen device that can reliably remove a processed material (contaminant) remaining on the screen.

  In order to solve the above-described problems, the present invention provides a bar screen that includes a plurality of bars arranged in parallel in the horizontal direction and receives a processed material that is input from above, a vibration generator that vibrates the bar screen, and the bar screen. An endless chain disposed above the endless chain, and a scraping member attached to the endless chain and scraping the processed material on the bar screen from the upper side of the bar screen. The bar screen is vibrated by being actuated when a member is at a position separated from the bar screen.

  According to this screen device, the processed material (contaminant) remaining on the bar screen is forcibly scraped off by the scraping member, so that the processed material (contaminant) can be reliably removed from the bar screen. Since the bar screen vibrates when the scraping member is at a position separated from the bar screen, the vibration of the bar screen does not propagate to the scraping member. Therefore, the influence of vibration on the scraping device including the endless chain can be eliminated.

  Further, according to the present invention, the scraping member includes a rake formed with comb teeth that enter the opening portion of the bar screen, and a scraper that is in sliding contact with the upper surface of the bar screen without entering the opening portion of the bar screen. It is comprised from these, It is characterized by the above-mentioned.

  According to this screen device, clogging of the opening portion can be prevented by the rake, and the processed material on the bar screen can be swept away by the scraper.

  In addition, the present invention is characterized in that a water discharge device is provided above the bar screen and for discharging water to the processed material on the bar screen.

  According to this screen device, the processed material on the bar screen can be effectively broken, and scattering of dust and the like from the processed material during the processing can be prevented.

  Further, the present invention is provided with a bar screen made up of a plurality of bars arranged in parallel in the horizontal direction and receiving a processed material introduced from above, a vibration generator for vibrating the bar screen, and an upper part of the bar screen. And a scraping member that is attached to the endless chain and scrapes the processed material on the bar screen from the upper side of the bar screen. (2) when the scraping member is at a position detached from the bar screen, a process of putting the processed material on the bar screen and vibrating the bar screen by the vibration generator to screen the processed material; ) After stopping the vibration of the bar screen, the endless chain is driven and the scraper member And performing stroke for scraping treatment product remaining on over emissions, and in that order.

  According to the processing method of the processed material by the screen device, the processed material (contaminant) remaining on the bar screen is forcibly scraped off by the scraping member, so that the processed material (contaminated material) is surely removed from the bar screen. Can be removed. Since the bar screen vibrates when the scraping member is at a position separated from the bar screen, the vibration of the bar screen does not propagate to the scraping member. Therefore, the influence of vibration on the scraping device including the endless chain can be eliminated.

  According to the present invention, the processed material (contaminants) remaining on the bar screen is forcibly scraped off by the scraping member, so that the processed material (contaminants) can be reliably removed from the bar screen. And since the vibration of a bar screen does not propagate to a scraping member, the influence of the vibration on a scraping apparatus can be eliminated.

It is side surface explanatory drawing of the screen apparatus which concerns on this invention. It is a plane explanatory view of a screen device concerning the present invention. It is front explanatory drawing of the screen apparatus which concerns on this invention. It is explanatory drawing of a rake, (a), (b) is side explanatory drawing, front explanatory drawing, respectively. It is explanatory drawing of a scraper, (a), (b) is side explanatory drawing and front explanatory drawing, respectively. It is sectional explanatory drawing of a bar screen. It is plane explanatory drawing of the edge part of a bar screen.

  1 to 3, a screen device 1 according to the present invention includes a bar screen 2 that includes a plurality of bars 2 </ b> A arranged in parallel in a horizontal direction and receives a processed material M that is input from above, and vibrates the bar screen 2. A vibration generator 3, an endless chain 4 disposed above the bar screen 2, and a scraping member 5 attached to the endless chain 4 to scrape the processed material M on the bar screen 2 from above the bar screen 2. Is provided.

  The processed material M is harbor sands, lakes, river dredged sand, sewage sludge, sludge, etc., and is dropped onto the bar screen 2 via the shooter 6, for example. These earth and sand contain various foreign substances G (stones, concrete pieces, metal scraps, glass pieces, cracked ceramics, plastic pieces, wood pieces, cloth pieces, carcasses of small animals and fish, etc.). Removes impurities G from the processed material M by the bar screen 2.

"Bar screen 2"
The bar screen 2 has a structure in which a plurality of horizontal bars 2A are arranged side by side at equal intervals in the horizontal direction. The bar 2A is made of a long plate-shaped steel material or the like, and is arranged so that the plate thickness direction is the horizontal direction as shown in FIG. The bar 2A of this embodiment is formed so that the plate thickness around the upper end is larger than the plate thickness of the lower portion. As a result, the bar screen 2 has a fine opening 7A having a small mesh size on the upper side and a coarse opening 7B having a large mesh size on the lower side. The mesh width dimension of the opening portion 7B is approximately in the range of 25 to 75 mm.

  As shown in FIG. 1, the bar 2 </ b> A has a constant height dimension H <b> 1 over the entire length, but the lower part extends downward as a connecting portion 8 in a total of three places near the center and both ends. Therefore, the height dimension H2 is larger. Each bar 2A is integrally connected by connecting and fixing the connecting portion 8 to the connecting beams 9A to 9C arranged in a horizontal and orthogonal manner with the bar 2A by welding or the like. The connecting beams 9A to 9C are a square tube material, a round tube material, or the like. If the end on the side where the scraping member 5 enters among the both ends of the bar 2A is formed to have an inclined surface 2B that is tapered in plan view as shown in FIG. On the other hand, the insertion of the comb teeth 24 of the rake 25 described later becomes smooth.

"Vibration generator 3"
As shown in FIGS. 2 and 3, both ends of the connecting beams 9 </ b> A to 9 </ b> C are fixed to the frame 10 extending along the bar screen 2 on both sides of the bar screen 2 by welding or the like. The frame 10 is, for example, a square tube material or the like, and has a structure in which the square tube materials are stacked in two stages in this embodiment. A vibration motor 11 as a vibration generator 3 is attached to the outer surface of the frame 10. The amplitude direction is, for example, a vertical direction, a horizontal direction, or an oblique direction. The vibration generating device 3 is not limited to the vibration motor 11 and may be a device combining a general-purpose electric motor and a vibration generating mechanism (crankshaft mechanism or the like).

  In FIG. 1 and FIG. 3, a coil spring 12 and a vibration isolating rubber 13 are interposed between the frame 10 and the floor F as a vibration isolating device for the floor F of the structure. In the present embodiment, a gantry 14 made of H-shaped steel or the like is disposed on the floor F via a plurality of anti-vibration rubbers 13, and the gantry 14 and the frame 10 are connected by a plurality of coil springs 12.

"Endless chain 4"
Above the one end side of the bar screen 2, a pair of left and right drive sprockets 16 that rotate integrally with a connecting shaft 15 extending along the width direction of the bar screen 2 are arranged, and above the other end side, the bar screen A pair of left and right driven sprockets 18 are integrally rotated by a connecting shaft 17 extending along the width direction 2. Between each drive sprocket 16 and each driven sprocket 18, the endless chain 4 is looped around so as to have a linear track along the upper surface of the bar screen 2 as viewed from the side as shown in FIG. 1. Yes. A transmission sprocket 19 is coaxially mounted near one drive sprocket 16, and a drive chain 22 is connected between the transmission sprocket 19 and an output sprocket 21 mounted on the output shaft of a motor 20 with a speed reducer. It is laid around. The motor 20 is mounted on a motor mount 23 on the floor F. As described above, the endless chain 4 is circulated and moved clockwise in FIG.

"Scraping member 5"
The scraping member 5 is attached so as to be spanned between the left and right endless chains 4. As shown in FIG. 4, the scraping member 5 of the present embodiment includes a rake 25 in which comb teeth 24 that enter the openings 7A of the bar screen 2 are formed, and an eye of the bar screen 2 as shown in FIG. The scraper 26 is in sliding contact with the upper surface of the bar screen 2 without entering the opening 7A. Two rakes 25 and two scrapers 26 are attached to the endless chain 4. Further, the rake 25 and the scraper 26 are alternately arranged.

“Rake 25”
In FIG. 4, the rake 25 includes a main body portion 27 made of channel steel that extends in the width direction of the bar screen 2, a plurality of comb teeth 24, and a comb tooth substrate 28. The plurality of comb teeth 24 are fixed to a comb tooth substrate 28 by welding or the like, and the comb tooth substrate 28 is detachably fastened and fixed to the web of the main body 27 by bolts 29 and nuts 30. One flange of the main body 27 is detachably fastened and fixed to the endless chain 4 by means of a bolt 32 and a nut 33 via an attachment 31. The comb tooth 24 is a flat plate member such as a steel plate arranged vertically along the opening portion 7A (FIG. 6), and the lower end of the comb tooth 24 enters the entire height dimension H1 of the bar 2A. Yes.

  A side plate 34 is attached to the side surface of the main body 27, and a guide roller 35 is attached to the side plate 34 with the width direction of the bar screen 2 as the rotation axis direction. The rake 25 is secured by the guide roller 35 guided by a guide frame 36 attached to the wall W of the structure, so that a lower straight track is secured. As shown in FIG. 3, the guide roller 35 is also guided by the guide frame 37 for the upper straight track.

"Scraper 26"
As shown in FIG. 5, the scraper 26 includes a main body portion 38 made of channel steel extending in the width direction of the bar screen 2, a flat scraper plate 39, and a mounting substrate 40. The scraper plate 39 is made of a synthetic rubber material or the like, and is sandwiched between the web of the main body 38 and the mounting board 40 and is detachably fastened and fixed by a countersunk screw 41 and a nut 42. The lower end of the scraper plate 39 extends below the lower flange of the main body 38 and is in sliding contact with the upper surface of the bar screen 2. The other structure is the same as that of the rake 25, and one flange of the main body 38 is detachably fastened and fixed to the endless chain 4 by the bolt 32 and the nut 33 via the attachment 31. A guide roller 35 is disposed on the side surface of the main body 38, and the scraper 26 is secured by the guide roller 35 guided by the guide frame 36, thereby ensuring a lower straight track.

"Water discharge device 43"
As shown in FIG. 3, water discharge pipes 44, 44 are arranged along the bar screen 2 as water discharge devices 43 for discharging water in order to break down the processed matter M on the bar screen 2 above both sides of the bar screen 2. Yes. A plurality of water discharge nozzles 45 are formed in each water discharge pipe 44 at an appropriate interval in the longitudinal direction. The water discharge nozzle 45 may be a nozzle unit attached to the water discharge pipe 44, or may be a simple hole drilled in the pipe wall of the water discharge pipe 44.

"Action"
A treated material M such as dredged sand that has been transported by a dump truck or a vacuum damper vehicle is dropped onto the bar screen 2 from the shooter 6. The operation of the screen device 1 is, for example, a batch type, and the input amount of the processed material M per time is, for example, about 10 tons at the maximum. When the workpiece M is dropped, the rake 25 and the scraper 26 are not located in the charging path space from the shooter 6 to the bar screen 2 as shown in FIG. It is in the retracted position in the vicinity of 18. As a result, the rake 25 and the scraper 26 are not buried in the processed material M to be dropped.

  When the workpiece M is dropped onto the bar screen 2, the vibration motor 11 is driven to vibrate the bar screen 2. Both the rake 25 and the scraper 26 are still in the retracted position and are separated from the bar screen 2. Therefore, the vibration of the bar screen 2 does not propagate to the rake 25 and the scraper 26, and the influence of the vibration on the scraping device including the endless chain 4, the drive sprocket 16, the driven sprocket 18 and the like can be eliminated.

  Due to the vibration of the bar screen 2, the processed material M is sifted down through the openings 7 </ b> A and 7 </ b> B for fine earth and sand, and is discharged to a predetermined processing unit through the opening 46 of the floor F, while having a large shape. The object G remains on the bar screen 2. In the bar screen 2, the lower opening portion 7B is formed to be coarser than the upper opening portion 7A. Therefore, once the sand and sand has passed through the opening portion 7A, it is smooth without causing clogging. It will fall downward. Further, water is discharged from the water discharge pipe 44, and the mass of the processed product M is effectively broken. The start timing of water discharge may be performed almost simultaneously with the driving of the vibration motor 11 or may be after the vibration motor 11 is stopped.

  Next, after the predetermined time has elapsed and the vibration motor 11 is stopped, the motor 20 is driven and scraping by the rake 25 and the scraper 26 is performed. The water discharge from the water discharge pipe 44 may be stopped when the vibration motor 11 is stopped, or may be continued during the scraping operation. The rake 25 scrapes the foreign matter G to the other end side of the bar screen 2 while the comb teeth 24 enter the opening portion 7A. The scraper 26 scrapes the foreign matter G to the other end side of the bar screen 2 while the scraper plate 39 made of a rubber material is in sliding contact with the upper surface of the bar screen 2. The scraped dust G is discharged to a container 47 arranged on the other end side of the bar screen 2. The scraping operation time is set appropriately. By repeatedly moving the rake 25 and the scraper 26 repeatedly, the dust G is reliably removed from the bar screen 2 and separated into a storage tank (not shown). Is done.

  As described above, the bar screen 2, the vibration generating device 3 that vibrates the bar screen 2, the endless chain 4 disposed above the bar screen 2, and the processed material on the bar screen 2 are attached to the endless chain 4. A scraping member 5 that scrapes M (contaminant G) from the upper side of the bar screen 2, and the vibration generating device 3 operates when the scraping member 5 is at a position separated from the bar screen 2 to If the screen 2 is configured to vibrate, the processed material M (contaminant G) remaining on the bar screen 2 is forcibly scraped off by the scraping member 5, so that the processed material M (contaminant G) is removed from the bar screen 2. Can be reliably removed from above. Further, since the vibration of the bar screen 2 does not propagate to the scraping member 5, the influence of the vibration on the scraping device including the endless chain 4 can be eliminated.

  Further, the scraping member 5 is slidably contacted with the rake 25 in which the comb teeth 24 that enter the opening portion 7A of the bar screen 2 are formed, and the upper surface of the bar screen 2 without entering the opening portion 7A of the bar screen 2. 26, the crevice 7A can be prevented from being clogged by the rake 25, and the scraper 26 can sweep away the processed material on the bar screen 2 so that the upper surface of the bar screen 2 can be wiped cleanly. be able to.

  Furthermore, if a water discharge device 43 is provided above the bar screen 2 to discharge water to the processed material M on the bar screen 2, the lump of the processed material M can be effectively broken down, so that the scraping member The scraping efficiency can be increased, and the scattering of dust from the processed material M during the processing can be prevented.

  The preferred embodiments of the present invention have been described above. The present invention can be modified in various ways without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Screen apparatus 2 Bar screen 2A Bar 3 Vibration generator 4 Endless chain 5 Scraping member 6 Shuter 7A (Upper side) Opening part 7B (Lower side) Opening part 11 Vibration motor 16 Drive sprocket 18 Driven sprocket 24 Comb tooth 25 Rake 26 Scraper 43 Water discharge device G Contaminant M Processed material

Claims (4)

A bar screen comprising a plurality of bars arranged side by side in the horizontal direction and receiving a processed material introduced from above;
A vibration generator for vibrating the bar screen;
An endless chain disposed above the bar screen;
A scraping member attached to the endless chain and scraping the processed material on the bar screen from the upper side of the bar screen;
With
The vibration generator is operated when the scraping member is at a position separated from the bar screen to vibrate the bar screen. The scraping member is
A rake formed with comb teeth that enter the opening of the bar screen;
A scraper that slidably contacts the upper surface of the bar screen without entering the opening of the bar screen;
The screen device according to claim 1, comprising:   The screen apparatus according to claim 1, wherein a water discharge device is provided above the bar screen and provided to discharge water to a processed product on the bar screen. A bar screen comprising a plurality of bars arranged side by side in the horizontal direction and receiving a processed material introduced from above;
A vibration generator for vibrating the bar screen;
An endless chain disposed above the bar screen;
A scraping member attached to the endless chain and scraping the processed material on the bar screen from the upper side of the bar screen;
A processing method of a processed object by a screen device comprising:
(1) when the scraping member is at a position separated from the bar screen, a process of putting the processed material on the bar screen and vibrating the bar screen by the vibration generator to screen the processed material;
(2) after stopping the vibration of the bar screen, driving the endless chain and scraping off the processed material remaining on the bar screen by the scraping member;
Are processed in that order, and the processing method of the processed material by the screen apparatus.

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