JPH0159019B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is for collecting precipitated sand by classifying it from 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 for etc.

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

The sand classification operation of this rotary classifier is as follows. The sand in the mixed water introduced into the rotating drum 1 from the input chute 7 settles and flows into the rotating drum 1.
It settles to the bottom. This settled sand is massaged by the action of the spiral blades 5 as the rotary drum 1 rotates, and is conveyed to the sand sampling port 2 side while removing impurities such as dirt and mud (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 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 collected outside the rotating drum 1 by the carry-out conveyor 8. be done.

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

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary classifier that can efficiently extract sand from raw water and also provides good dehydration of the collected sand, in order to solve these conventional problems.

In the present invention, one of the openings on both sides of a horizontally installed rotating drum into which mixed water containing sand is input and the sand is precipitated at the bottom is a drainage port and the other is a sand sampling port, and the inner circumferential surface of the rotating drum is is provided with a spiral blade for conveying the settled sand to the sand sampling port side, and a plurality of scraping blades are arranged radially on the inner peripheral surface of the rotating drum on the sand sampling port side to transport the settled sand. A rotary classifier is provided with a sand carrying member that can scoop up sand, transport it to the ceiling, and drop it, and further receives the falling sand and carries the sand out of the rotating drum. It is characterized in that an elastic ring is provided to constitute a part of the drum, and raking blades are provided radially around the inner circumference of the elastic ring, and an impact member that repeatedly impacts the elastic ring is provided. It is a rotary classifier.

Next, embodiments of the present invention will be described with reference to FIGS. 3 to 8.

At one end of the horizontally installed rotating drum 11, a drainage end plate 12 and a first annular partition plate 13 are provided in connection with this to form an insertion opening for the raw water input chute 14, and at the other end as a discharge side end plate. A third annular partition plate 15 and a second annular partition plate 16 are provided adjacent thereto, and spiral blades ( A screw ribbon) 17 is provided protruding from the inner wall of the rotating drum 11, and a first rake blade 18 made of a water-permeable material is spirally disposed between the second annular partition plate 16 and the third annular partition plate 15. A second raking blade is arranged radially inside the blade 17 and receives the settled sand that falls after being transferred to the ceiling by the first raking blade 18.
A primary side discharge chute 19 for discharging to the upper part of the raking blade 22 is provided. Note that the inner diameter of the opening of the third annular partition plate 15 is smaller than the inner diameter of the opening of the first annular partition plate 13.

Furthermore, an elastic ring 20 is provided which connects with the third annular partition plate 15 to form a part of the rotating drum 11, and both ends of the elastic ring 20 are connected to the third annular partition plate 15 and the fourth annular partition plate 21. A second scraper blade 22 is connected to the elastic ring 20 and protrudes radially from the inner periphery of the elastic ring 20. A secondary discharge chute 23 is provided to pass through the opening of the fourth annular partition plate 21 to receive the settled sand that falls after being transferred to the ceiling by the upper blade 22 and discharge it to the outside of the rotating drum 11. There is.

On the other hand, vibrating devices 24 and 24' are provided directly above and below the elastic ring 20, respectively, for applying repeated impacts to the elastic ring 20.
The vibration devices 24 and 24' are structured to transmit vibrations from the oscillator 24a to the elastic ring 20 via the roll 24b, and the roll 24b rotates following the rotation of the rotating drum 11. There is.

In addition, the first annular partition plate 13 inside the rotating drum 11
An inclined plate sedimentation device 25 is provided at the bottom of the vicinity, and a rectifier plate 26 is provided on the first annular partition plate 13 side near the tip opening of the raw water input chute 14, and the primary side discharge chute 19 is provided with a rectifying plate 26 for discharging settled sand. A washing water sprinkling pipe 27 for washing is provided.

In addition, in the space A, as shown in FIG. 8, a guard plate 28 is provided to prevent the settled sand raked up by the second raking blade 22 from falling to the bottom of the drum during raking. It is arranged.

In Figures 3 to 8, 27' is a water supply pipe, 29 is a raw water inlet, 30 is a pedestal, 31 is a discharge chute, 3
2 is a drain port, 33 is a tire, 34 is a support roll,
35 is a bearing, 36 is a chain, 37 is a drive device, 3
8 is a ladder, 39 is a suspension frame, 40 is a chain wheel, 41 is a support, 42 is a pedestal, and 43 is a support piece.

In the present invention, the following various embodiments can be adopted. In other words, a descending plate may be immersed in water closer to the first annular partition plate 13 than the inclined plate settling device 25, or the space B from the vicinity of the opening at the end of the raw water input chute 14 to the third annular partition plate 15 may be The plurality of compartments are partitioned by at least one annular partition plate, and a first rake blade 1 is provided in each of the plurality of compartments.
8. Primary side discharge chute 19 and washing water sprinkler pipe 2
A member similar to 7 may be arranged, or the space A may be divided by one or more annular partition plates, and a second rake blade 2 may be provided in each of the plurality of compartments.
2. Secondary side discharge chute 23 and vibration device 24,
A member similar to 24' may be provided, a hammering device or a pressing member may be provided in place of the vibrating device 24, or a hammering device may be provided in place of the vibrating device 24'. .

Further, a washing water sprinkling pipe may be provided in the secondary side discharge chute 23, the second raking blade 22 may be made of a water-permeable material, and a washing water sprinkling pipe may be provided below in the space A or B. You can also.

Furthermore, a discharge conveyor such as a belt conveyor may be used instead of the primary discharge chute 19 and the secondary discharge chute 23.

Therefore, the raw water is supplied to the raw water input port 29,
The raw water is supplied into the rotating drum 11 through the raw water input chute 14. The settling sand is removed by the first spiral blade 17.
The liquid is transferred to the raking blade 18, and then transferred to the ceiling by the first raking blade 18, and then falls into the primary side discharge chute 19 and is supplied into the space A. The settled sand deposited between the second raking blades 22 receives repeated impacts from below the bottom of the elastic ring 20, and becomes compacted while removing impurities adhering to the sand.

In this case, the settled sand is washed by the wash water from the wash water sprinkling pipe 27 in the primary side discharge chute 19, and then the settled sand and wash water flow together into the space A, but as described above, The settled sand is effectively dehydrated, and in the space A, the layers are separated into a washed water layer (upper layer) and a dewatered sand layer (lower layer). Since the height of this washing water layer is higher than the water level in the space B, the water in the washing water layer flows into the space B, and the settled sand in the space A is washed.

The compacted settled sand is transferred to the ceiling by the second raking blade 22. This settled sand is firmly held between the second raking blades 22, 22, so normally it does not fall even when it reaches the ceiling, but due to the repeated impact given by the vibrating device 24 through the elastic ring 20, After being subjected to an effective falling action, it falls into the secondary discharge chute 23 and is then discharged to the outside of the rotating drum 11.

As described above, the rotary classifier of the present invention has
In addition to being able to efficiently collect sand from raw water, vibration is applied to the collected sand, which greatly improves classification efficiency. It also has a cleaning effect, has good dewatering conditions, and can be transported as is to the place of use. Moreover, by applying repeated impacts to the elastic body, the main rotating drum is not affected, and the impact generating device can be small and inexpensive, and stable work is guaranteed and safety can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional front view of a conventional rotary classifier.
Figure 2 is a sectional view along the line of Figure 1, Figure 3-
Fig. 8 shows an embodiment of the present invention, Fig. 3 is a front view, Fig. 4 is a right side view, Fig. 5 is a left side view, Fig. 6 is a sectional front view, and Fig. 7 is a front view. Figure 6-
FIG. 8 is a sectional view taken along line FIG. 6. 1...Rotating drum, 2...Sand sampling port, 3...Drainage port, 4...Raw water input port, 5...Spiral blade, 6
... Raking blade, 7 ... Input chute, 8 ... Output conveyor, 11 ... Rotating drum, 12 ... Drain side head plate, 13 ... First annular partition plate, 14 ... Raw water inlet chute, 15 ... Third annular partition plate, 16...
Second annular partition plate, 17... Helical blade, 18...
First raking blade, 19...Primary side discharge chute, 2
0... Elastic ring, 21... Fourth annular partition plate, 2
2... Second raking blade, 23... Secondary side discharge chute, 24, 24'... Vibration device, 25... Inclined plate settling device, 26... Rectifying plate, 27... Washing water sprinkler pipe, 27 '...Water supply pipe.

Claims (1)

[Scope of Claims] 1 One of the openings on both sides of a horizontally installed rotating drum into which mixed water containing sand is input and the sand is precipitated at the bottom is a drainage port and the other is a sand sampling port, A spiral blade is disposed on the inner circumferential surface of the rotary drum for transporting the settled sand to the sand sampling port side, and a plurality of scraping blades are disposed radially on the inner circumferential surface of the rotary drum on the sand sampling port side, A rotary classifier is provided with a sand carrying member that is capable of scooping up settled sand, conveying it to the ceiling, and dropping it, and that further receives the falling sand and carries the sand out of the rotating drum, and is connected to the spiral blade. an elastic ring so as to constitute a part of the rotating drum;
Raising blades are provided radially on the inner circumference of the elastic ring,
A rotary classifier further comprising an impact member that repeatedly applies impact to the elastic ring.