JPH0398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a classification and dewatering machine for washing and sorting sand from undiluted turbid water, dewatering it, and recovering it at a gravel extraction site or a stone crushing site.

(Prior Art) Conventionally, as a device for washing and sorting sand from undiluted turbid water at a gravel extraction site or a stone crushing site, there is a classifier as shown in, for example, JP-A-57-180441.

As shown in Fig. 7, this type of classifier uses spiral blades 2 to transfer the sand that has settled to the bottom of a sedimentation tank 1, scrapes it up with a bucket 3, and transfers it to the bottom of a settling tank 1 using a conical chute 4.
Normally, the sand discharged from the discharge chute 5 is loaded onto a dump truck D by a conveyor 6.

The sand discharged from the discharge chute 5 is scooped up by a bucket 3 and drained while sliding down the conical chute 4, but the drainage is not sufficient and the work site becomes dirty. Another drawback was that water was scattered during transportation by dump truck.

Therefore, we have removed these drawbacks of conventional classifiers,
Unexamined patent application published in 1983 as a device to further dehydrate the discharged sand.
A classification dehydrator as shown in No. -54746 has already been proposed.

As shown in Fig. 8, this classification dehydrator transfers the sand that has settled to the bottom of the settling tank 7 with a spiral blade 8, scrapes it up with a bucket 9, and supplies the scraped up sand to a dehydrator 10 for dewatering. As a result, compared to the classifier shown in Figure 7 earlier, the work site is much less contaminated with water, and even if the product is immediately transported by dump truck, water does not scatter, and the product is Since the mud content of the sand obtained as a sand is reduced, mud does not accumulate in one part of the product sand, and the product can be made uniform.

(Problem to be solved by the invention) However, even with the above-mentioned classification dehydrator,
The sand was not always well drained, and since the sand was washed only once in the settling tank, the mud was not washed sufficiently either.

The purpose of the present invention is to solve the problems of the conventional classification dehydrator as described above, and to thoroughly wash the sand with water to reduce the mud content, and at the same time, to more thoroughly dehydrate the water contained in the sand. It is in.

(Means for solving the problems) In order to achieve the above object, the classification dehydrator of the present invention has the following features:
A first sedimentation tank that receives the undiluted water that is turbid water mixed with sand and causes the sand to settle; several spiral blades that transport the sand that has settled to the bottom of the first sedimentation tank; and a terminal end of the spiral blades. A first rotating body consisting of a raking bucket arranged in an annular manner for scraping up sand containing water that has been transferred; a chute for receiving water-containing sand; a second settling tank for adding water for rewashing to the chute to further settle the sand; and transporting the settled sand to the bottom of the second settling tank. a second rotating body consisting of several spiral blades and a raking bucket arranged in an annular manner for raking up sand containing water that has been transferred at the end of the spiral blade; and the second rotating body. a dehydrator that receives sand containing water from the bucket in a hollow part of the bucket arranged in an annular manner, dehydrates it and discharges it; and a common drive shaft that simultaneously drives the first rotating body and the second rotating body. The structure is equipped with the following.

(Operations and Effects) Since the classification dehydrator of the present invention has the above-described configuration, it exhibits the following operations and effects. That is, when the undiluted solution (turbid water) is supplied to the first sedimentation tank,
First, the sand that has settled to the bottom of the first sedimentation tank is transferred by the spiral blades of the first rotating body that is rotationally driven by a common drive shaft, and is raked up with water in a raking bucket and thrown into a chute. be done.

The sand containing water put into the chute is then supplied to the second settling tank while being rewashed by adding water necessary for the second settling tank onto the chute. The sand that has settled to the bottom of the second sedimentation tank is transferred by the spiral blades of the second rotary body that is rotationally driven by a common drive shaft, and is raked up in a water-containing state by a raking bucket, and then sent to the dewatering machine. It will be inherited and dehydrated.

However, according to the classification and dewatering machine of the present invention, the sand is washed with water in the first settling tank and then washed with water on the chute connecting the first and second settling tanks and also in the second settling tank, so that the sludge is removed. It is sufficiently removed and the product is made more uniform.

(Example) The illustrated embodiment will be described below.

Fig. 1 is a partially cutaway front view of the classification dehydrator of the present invention, Fig. 2 is a plan view of the same as above, and Fig. 3 is Fig. 1 A-A.
4 is a BB view, and FIG. 5 is a right side view of the same as above.

20 is a first sedimentation tank, and 50 is a second sedimentation tank, in which the turbid water supplied from the stock solution supply pipe 21 to the first sedimentation tank 20 is stored.

Reference numeral 22 denotes a shaft tube, which serves as a common drive shaft for the first rotating body 30 consisting of a spiral blade 31 and a raking bucket 32 and the second rotating body 40 consisting of a spiral blade 41 and a raking bucket 42. This common drive shaft 22 is integrally provided at its front and rear ends, and the shafts 23 and 24 are a bearing 51 mounted on the front part of the second settling tank 50 and a bearing mounted on the rear part of the first settling tank 20. A pulley 6 is supported by the rear shaft 25 and fixed to the rear shaft 24 by a motor 61 attached to the machine frame 60 through a belt or chain 62.
It is designed to be rotationally driven by rotating 3.

While the undiluted solution is stored in the first settling tank 20, the sand settles to the bottom, and the mud passes through the overflow gutter 26 to the drain port 27 along with the overflow water. is discharged from.

The spiral blades 31 of the first rotating body 30 are supported on the common drive shaft 22 by supporting members 33 .
The sand that has settled to the bottom of the sand is transported in the direction of arrow a in Figure 1. Here, in the first sedimentation tank 20, primary washing of mud contained in the sand is performed, and the amount of sand at the bottom of the sedimentation tank 20 is transferred from the spiral blade transfer start end side 31a to the transfer end side 31b. Since the width of the spiral blade 31 gradually increases as the width increases, the width of the spiral blade 31 changes accordingly.
It is small (l in the figure) at the end a, and large (l in the figure) at the terminal end side 31b.

The raking bucket 32 has spiral blades 31
At the terminal end of the support member 33, the horizontal member 34...
It is supported in an annular manner by ... (see Figure 5). The raking bucket 32 is provided for each spiral blade between a wide front plate 35 made of a perforated plate and a narrow rear plate 36, and uses the perforated plate to drain the sand transferred by the spiral blade 31 into water. It is designed so that it is scraped up while cutting and thrown into a chute 80.

For this reason, the inclined plate 37 of the bucket 32 is inclined so that the sand falls when it reaches the top of the chute 80 (see FIG. 5).

The chute 80 is connected to the machine frame 60 as shown in FIG.
Accordingly, the hollow part 38 of the annularly arranged raking bucket 32 is arranged to receive sand from the bucket 32. Further, the chute 80 receives the sand from the bucket 32 of the first rotating body, and adds the necessary amount of water for rewashing to the sand scraped up from the first sedimentation tank in the second sedimentation tank. Additionally, a baffle plate 82 is provided in the trough portion within the chute to generate turbulent flow to wash away the mud contained in the sand as it is supplied to the second sedimentation tank. The sand supplied to the second settling tank 50 settles to the bottom while being stored in the second settling tank 50, the sand is washed twice, and the mud is drained together with overflow water through the overflow gutter 52. It is discharged from the port 53.

The spiral blade 41 of the second rotating body 40 is
Similar to the rotating body, there is a support member 43 on the common drive shaft 22...
It rotates together with the common drive shaft 22 to transfer the sand settled to the bottom of the second sedimentation tank 50 in the direction of arrow a in FIG. 1. Here the second
In the sedimentation tank 50, the amount of sand at the bottom of the sedimentation tank 50 is also large at the transfer starting end side 41a of the spiral blade, so the width of the spiral blade 41 also changes from the starting end side 41a to the terminal end side 41b accordingly. Overall, the width l is approximately the same as the width l of the terminal end side of the spiral blade of the first rotating body 30.

The raking bucket 42 of the second rotating body 40 is
Similar to the first rotating body, the end portion of the spiral blade 41 is annularly supported by the horizontal members 44 of the supporting member, as shown in FIG. The raking bucket 42 is provided for each spiral blade between a wide front plate 45 and a narrow rear plate 46, which are perforated H plates like the first rotary body, and is used for transporting by the spiral blade 41. Rake up the sand that has fallen,
It is designed to be fed into a dehydrator 70.

For this reason, the inclined plate 47 of the bucket 42 is inclined so that the sand falls when it reaches the top of the dehydrator 70, as shown in FIG.

The dehydrator 70 is arranged by a machine frame 60 so as to receive sand from the bucket 42 in the hollow part 48 of the annularly arranged raking bucket 42.

71 is a sand receiving chute.

The dehydrator 70 has a frame 72 as shown in FIG.
A screen 73 is installed at the bottom of the
The frame body 72 is elastically supported by four springs 74, and vibration motors 75, 7 are mounted on the upper part of the frame body.
5 is attached, the sand is vibrated, and the received sand is vibrated through the screen 73, and the moisture is discharged under the screen, thereby dewatering the sand. The dewatered sand is transferred to the dewatering machine tip 76 as shown by arrow b in Figure 1.
is discharged from. Here, the dehydrator 70 of this embodiment
The sand discharging section (tip) 76 is arranged downward to the right in FIG. 1 so that the sand discharging section (tip) 76 is located lower than the sand receiving section 71 in order to improve the sand discharging efficiency. In the case of a conventional device as shown in FIG.
Since the sand supplied to the sand was not sufficiently dehydrated, it was necessary to sufficiently dehydrate it using the dehydrator 10. Therefore, the dehydrator 10 was placed in a nearly horizontal position to allow for slow transfer of the sand. However, in the present invention, since the sand supplied to the dehydrator 70 has been sufficiently dehydrated in advance by the second bucket 42, the transfer of sand by the dehydrator 70 is not necessary. Even if the speed is increased, sufficient dewatering can be achieved, and therefore, compared to conventional apparatuses, the quality of the sand can be significantly improved in conjunction with the effects of the first and second sedimentation tanks and the rotating body.

On the other hand, there is a water receiving gutter 90 below the dehydrator 70, and the water discharged under the screen is transferred to this gutter 90.
The water is then returned to the second sedimentation tank 50 through the water receiving portion 91 of the sedimentation tank. The reason why the wastewater was returned to the second sedimentation tank 50 in this way was to prevent the wastewater from scattering, and since the wastewater still contained fine sand that could be turned into a product, it was further This is because they did not want to collect it.

The water receiving gutter 90 is provided in a portion where the dehydrator 70 protrudes from the second sedimentation tank 50. As for the part that does not protrude but is inside, the drainage water enters the sedimentation tank 50 as it is, so no gutter is required.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment,
Modifications can be made within the scope of the invention. For example, if a more complete dewatering state of sand is more important than processing capacity (sand discharge speed), the dehydrator 70 may be arranged horizontally.

The chute 80 does not necessarily need to be provided with the return flow path 81.

The width of the spiral blade is arbitrary; for example, the width of the blade of the first rotating body may be made uniform, and the width of the blade of the second rotating body may be gradually increased from the start end to the end of the transfer.

The overflow gutter 26 of the first settling tank 20 and the overflow gutter 52 of the second settling tank may be in communication.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the classification dehydrator of the present invention, Fig. 2 is a plan view of the same as above, and Fig. 3 is Fig. 1 A-A.
Figure 4 is a BB view, Figure 5 is a right side view of the same as above, Figure 6 is a cross-sectional view of the dehydrator, Figures 7 and 8.
Each figure is an explanatory diagram of a conventional device. 20...first sedimentation tank, 22...common drive shaft,
30...first rotating body, 40...second rotating body,
31,41...Spiral feather, 32,42...
Scraping bucket, 50...Second sedimentation tank, 70
...Dehydrator, 80...Shoot.

Claims (1)

[Scope of Claims] 1. A first sedimentation tank that receives a raw solution of turbid water mixed with sand and causes the sand to settle; several spiral blades that transport the sand that has settled to the bottom of the first sedimentation tank; A first rotating body consisting of a raking bucket disposed in an annular manner for raking up water-containing sand that has been transferred at the end of the spiral blade; a chute that receives water-containing sand from the bucket in the hollow part of the bucket; a second sedimentation tank that adds water for rewashing to the chute to further settle the sand; and a bottom of the second sedimentation tank. a second rotating body consisting of several spiral blades for transporting the sand that has settled in the area, and a raking bucket arranged in an annular shape for raking up the transported water-containing sand at the end of the spiral blade; , a dehydrator that receives sand containing water from the bucket in a hollow part of the bucket arranged annularly in the second rotating body, dehydrates it and discharges it; and the first rotating body and the second rotating body. A classification dehydrator equipped with a common drive shaft that drives both at the same time. 2. The classification dehydrator according to claim 1, wherein the dehydrator has a sand discharge section located below a sand receiving section. 3 The chute adds water for re-washing to the water-containing sand received from the bucket of the first rotating body, so as to enhance the sand re-washing effect due to the turbulent flow of water occurring on the chute. A classification dehydrator according to claim 1 or 2. 4. The width of the spiral blade of the first rotating body is small at the sand transfer starting end side and wide at the sand transfer terminal side, and the spiral blade of the second rotating body is The classification dehydrator according to claim 1, 2, or 3, wherein the width of the blade is approximately the same as the width of the spiral blade of the first rotary body at the transfer end side.