JPH0160298B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is for collecting settled sand by classifying it with water and mud from mixed water mixed with sand that is generated when soil mined from a riverbed etc. is washed and sorted with an aggregate classifier. Regarding rotary classifiers used in

Conventionally, rotary classifiers for collecting sedimentary sand from rivers, which are heavily used as aggregate sand for concrete and asphalt roadbeds, are used, for example, in
It had a structure as shown in Figure 2. That is, the openings on both sides of the rotating drum 1 are used as a raw water inlet 4 that also serves as a sand sampling port 2 and a drainage port 3, respectively, and a spiral blade 5 is provided on the inner peripheral surface of the rotating drum 1 to collect sand from the raw water inlet 4. A plurality of raking blades 6 are disposed over the opening 2, and a plurality of raking blades 6 are disposed radially at equal angles on the inner circumferential surface of the rotating drum 1 on the sand sampling opening 2 side. Further, an input chute 7 is provided at the raw water input port 4, and an output conveyor (export member) 8 is provided at the sand sampling port 2, respectively.

The sand classification operation of this rotary classifier is as follows. The sand in the mixed water introduced into the rotary drum 1 from the input chute 7 settles and settles at the bottom of the rotary drum 1. This settled sand is transferred to rotating drum 1.
As the sand rotates, it is massaged by the action of the helical blade 5, and is transported to the sand sampling port 2 while removing impurities such as dirt and mud (having a low specific gravity). These impurities float to the surface, are transferred to the drain port 3 side, and are discharged to the outside of the rotating drum 1 along with the water. On the other hand, the settled sand that has been conveyed to the sand sampling port 2 side is scooped up one by one by the raking blades 6, falls onto the carry-out conveyor 8 at the ceiling position of the rotating drum 1, and is transferred to the carry-out conveyor 8.
The sample is collected outside the rotating drum 1.

At this time, the settled sand is only scooped up by the raking blades 6, so that not only the sand collection efficiency but also the dehydration state of the collected sand is not good, which is not desirable.

In order to solve these conventional problems, it is an object of the present invention to provide a rotary classifier that can efficiently extract sand from raw water and also provides good dewatering of the collected sand.

That is, the present invention provides a rotary classifier configured to accurately settle the solids transferred from the previous stage in the compartments between the scraping blades, and to repeatedly apply impact to the precipitated solids to dehydrate them. The solids are delivered so that substantially the entire amount of the solids transferred from the previous stage falls into the compartments defined by the scraping blades on the same side as the rotational direction of the drum. Along with arranging the parts,
The rotary classifier is characterized in that an impact member is provided to repeatedly impact the lower half of the drum on the opposite side to the rotational direction of the drum.

An embodiment of the present invention will be described with reference to FIGS. 3 to 6. A rotating drum 14 includes a cylindrical portion 12 made of a non-elastic material 11 and an elastic ring 13 made of an elastic material. is installed horizontally, and the rotating drum 14 is provided with a first annular partition plate 15 to a fourth annular partition plate 18 in order from the raw water supply side to the solid matter discharge side, and has first compartments a to third compartments c. are divided into sections. Note that the elastic ring 13 is connected to the cylindrical portion 12 via a third annular partition plate 17.

The opening of the first annular partition plate 15 forms an insertion port for the raw water input chute 19 and a separated water drainage port, and the first annular partition plate 15 and the water permeable second
On the inner circumferential surface of the cylindrical portion 12 (first compartment a) between the annular partition plates 16, there are spiral blades 20 for transferring the precipitated solids, and radially disposed surfaces connected to the ends of the spiral blades 20. Permeable first rake blades 21 are installed. In addition, a second
A second water-permeable raking blade 22 is connected to the annular partition plate 16 and the third annular partition plate 17 for receiving solid matter in the raw water that is supplied falling from the raw water input chute 19 and transferring it to the ceiling. A lead-out chute 23 is installed inside the first raking blade 21 and the second raking blade 22 to receive the solid matter falling from these raking blades and supply it into the third compartment c. It is arranged.

Further, in the third compartment c, an impermeable third raking blade 24 is connected to the third annular partition plate 17 and the fourth annular partition plate 18, and has a gap between it and the inner wall of the elastic ring 13. The receiving port of the discharge chute 25 is opened to receive the solid matter falling from the third raking blade 24 and discharge it to the outside of the rotary drum 14. The raw water input port of the raw water input chute 19 is opened to face the inner bottom of the second compartment b, and the first compartment a has an inclined plate sedimentation device 26 adjacent to the first annular partition plate 15. is placed immersed in water.

In the figure, 27 indicates the raw water input chute 19, the inclined plate settling device 26, the outlet chute 23, and the discharge chute 25.
28 is the lead-out chute 2
29 is a water supply pipe; 29 is a water supply pipe;
30 is a guard plate, which is a third raking blade 24
This is for discharging substantially all of the solid matter scraped up by the rotary drum 14 to the outside of the rotating drum 14.

The lead-out chute 23 is connected to the "rotating drum 1" out of the compartments formed by the third raking blades 24.
It is arranged so that it falls into a compartment on the same side as the direction of rotation of 4. Here, "Rotating drum 14
For example, in FIG. 5, the same side as the rotation direction of the rotating drum 14 corresponds to the clockwise rotation of the rotating drum 14, and the third raking blade 24 located within the right half of the semicircle in FIG. This means that the solid matter outlet of the outlet chute 23 is opened so that substantially all of the solid matter falls toward the solid matter.

A lower vibration device for repeatedly applying impact to the elastic ring 13 on the side of the bottom outer wall of the elastic ring 13 opposite to the rotating direction of the rotary drum 14 (that is, the elastic ring 13) (left side for clockwise rotation, right side for counterclockwise rotation). 31 are placed in contact with each other.

This lower vibration device 31 includes an oscillator 32 such as a vibrator, a frame 33, a bearing (not shown),
It is constructed by supporting rollers 34, springs 35, etc. on a pedestal 36, and the vibration of the oscillator 32 is transmitted in the order of frame 33→bearing→roller 34→elastic ring 13. spring 35
is a vibration damping member.

Further, an upper vibrating device 38 having a structure similar to that of the lower vibrating device 31 and supported by a pedestal 37 is disposed in contact with the top outer wall of the elastic ring 13 . In FIG. 3, 39 is a water surface, 40 is a drive device, 41 is a chain, 42 is a support roller, and 43 is a tire.

Therefore, to explain the operation and effect of the above embodiment, raw water is charged into the second compartment b by the raw water input chute 19, solids that tend to settle settle on the second raking blade 22, and Recalcitrant solids as well as floating foreign matter and impurities flow into the first compartment a. Floating foreign matter, etc. overflows from the separated water outlet together with the separated water, and solid matter that is difficult to settle settles in the first compartment a, and is transported into the discharge chute 23 by the helical blade 20 and the first raking blade 21. The solids that are easily settled and fall from the second raking blade 22 on the ceiling are fed into the third compartment c.
Most of these fall into the area R ₂
It then falls onto the third raking blade 24 located inside.

In this case, the elastic ring 13 in the region R ₁ receives repeated impacts directly from the lower vibrating device 31, so the vibration energy is large, and the vibration energy received by the elastic ring 13 in the region R ₂ is comparatively small. Therefore, the solids falling toward the third raking blade 24 in the region R ₂ receive the vibrational energy of the water in the third compartment c and vibrate appropriately, so that the solid objects fall between the third raking blades 24. Floating foreign matter, etc., which have been entrained and transferred between the solid particles during precipitation in the compartment chamber of the third annular partition plate 17, are separated from the solid particles.
As well as overflowing the second annular partition plate 16, foreign substances in the solids that are settling or have settled in the compartments between the third raking blades 24 are similarly separated and removed. On the other hand, although the solid matter entering the region _R1 has already been dehydrated to some extent, it receives sufficient vibrational energy here and is further dehydrated while separating foreign matter etc., resulting in a compacted state. The separated water separated to the lower side of the dehydrated solid layer during this dewatering process is effectively discharged from the gap between the third raking blade 24 and the inner wall of the drum. The dehydrated solid material obtained in this way is transferred to the ceiling by the third scraping blade 24, but is subjected to the vibration action of the upper vibration device 38, and the elastic ring 13,
It is effectively peeled off from the third raking blade 24 and discharged to the outside of the rotating drum 14 via the discharge chute 25.

The derivation chute 23 transfers substantially the entire amount of solids falling from the second scraping blade 22 to the _third
By dropping the solids toward the raking blades 24, sufficient settling time is given to the solids in the third compartment c, and as much solids as possible are settled in the compartment between the third raking blades 24. However, in order to make this effect even more effective, an inclined plate settling device may be installed at an appropriate position near the outlet chute 23, or the solid material outlet of the outlet chute 23 may be placed in the area _R2.
It is preferable to extend the guard plate 30 so as to be close to the tip of the third raking blade 24 located inside, or to arrange the guard plate 30 close to the tip of the third raking blade 24 as shown by the dotted line in FIG. . Such a guard plate 30 can prevent foreign matter separated from the solid material from adhering to and being entrained in the vibration-dehydrated solid material.

It is desirable that the lower vibration device 31 is placed in a position where the solid matter settled on the third scraping blade 24 is vibrated for as long as possible. It is preferable that it be able to move to any position along the outer wall of the Lin army 13.

In the above embodiment, the portion of the drum in which the lower vibration device is installed is made of an elastic ring, but it may be made of a non-elastic material, and a hammering device or a pressing member is provided in place of the upper vibration device. Alternatively, a hammering device may be provided in place of the lower vibration device.

Furthermore, a discharge conveyor such as a belt conveyor may be provided in place of the lead-out chute and the discharge chute.

As described above, according to the present invention, it is possible to accurately separate foreign substances entrained in the solids that are settling on the raking blades, and also to extremely effectively dehydrate the settled solids. Since it can be processed, high-quality solids with low moisture content can be obtained, and a large amount of solids can be held and transferred on the raking blades, making it suitable for large-scale processing.

[Brief explanation of drawings]

FIG. 1 is a sectional front view of a conventional example, FIG. 2 is a sectional view taken along the line of FIG. 1, FIGS. 3 to 6 show embodiments of the present invention, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is a sectional view taken along line BB in FIG. 4. 11... Non-elastic body, 12... Cylindrical part, 13...
Elastic ring, 14... Rotating drum, 15... First
Annular partition plate, 16... Second annular partition plate, 17...
Third annular partition plate, 18...Fourth annular partition plate, 19
...Raw water input chute, 20...Spiral blade, 2
1...First rake blade, 22...Second rake blade, 2
3... Derivation chute, 24... Third raking blade, 2
5... Discharge chute, 26... Inclined plate sedimentation device,
27... Frame, 28... Washing water sprinkler pipe, 29...
Water supply pipe, 30...guard plate, 31...lower vibration device, 32...oscillator, 34...roller, 3
8... Upper vibration device.

Claims (1)

[Claims] 1. In a rotary classifier in which solids are scraped up from the liquid by scraping blades arranged radially on the inner peripheral surface of a rotating drum, the solids transferred from the previous stage are A solid matter deriving member is disposed so that substantially the entire amount of the material falls into a compartment formed by the raking blades, which is located on the same side as the rotational direction of the drum; A rotary classifier characterized in that an impact member that repeatedly impacts the drum is disposed on the lower half side of the drum on the opposite side. 2. The drum wall in the area where the raking blades are installed is made of an elastic material all around, and an impact member that applies repeated impacts is installed at the top of the drum wall. A rotary classifier according to claim 1. 3. The rotary classifier according to claim 1 or 2, wherein a plate-like member is disposed close to the inner end of the scraping blade on the opposite side to the rotational direction of the drum. 4. The rotary classifier according to claim 1, 2 or 3, wherein an inclined plate settling device is immersed in water in proximity to the raking blades on the same side as the rotational direction of the drum. 5. The rotary classifier according to claim 1, 2 or 3, wherein the scraping blade has a water passage port for dehydrated and separated water between it and the inner wall of the drum.