JPH0520121B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a solid-liquid separator that separates solid particles and liquid, and more specifically, the present invention relates to a solid-liquid separator that separates solid particles and liquid, and more specifically, solid particles that have settled at the bottom of a sedimentation tank are separated from the sedimentation tank by a bucket. This invention relates to a solid-liquid separator that discharges liquid to the outside of the tank, while causing liquid to overflow from a settling tank.

(Prior Art) Various types of solid-liquid separators have been known as solid-liquid separators for discharging solid particles precipitated at the bottom of a settling tank to the outside of the settling tank.

A screw type solid-liquid separator has a screw conveyor placed in an inclined sedimentation tank. Solid particles are scraped up and discharged by a rotating screw conveyor.

The bucket type solid-liquid separator uses a bucket conveyor, which has a plurality of buckets attached to an endless chain, as a discharge means. This bucket conveyor is rotated, and the solid particles are scooped up by the bucket and discharged to the outside of the settling tank.

The belt-type solid-liquid separator has a conveyance start end placed in a settling tank, and uses an upwardly inclined belt conveyor as a discharge means. Solid particles are placed on a belt conveyor and transported out of the settling tank and discharged.

In a rotary solid-liquid separator, a plurality of lifting plates are installed perpendicularly to the inner wall of a drum-shaped sedimentation tank and extend in the longitudinal direction of the sedimentation tank, and a belt conveyor is passed through the drum-shaped sedimentation tank. The solid particles settled on the bottom of the rotating drum-shaped settling tank are lifted up by the lifting plate, dropped onto the belt conveyor, and discharged out of the drum-shaped settling tank by the belt conveyor.

In the Hardinge type solid-liquid separator, spiral blades are provided on the inner wall of a drum-type sedimentation tank, and a plurality of lifting plates are erected perpendicularly to the inner wall at the transfer end of the spiral conveyor. The solid particles settled on the bottom of the rotating drum-shaped settling tank are transferred to the position of the lifting plate by the spiral blade, and then the lifting plate lifts the solid particles and discharges them out of the drum-shaped settling tank.

(Means for Solving Problems) However, the various solid-liquid separators described above have the following problems.

Screw-type, bucket-type, and belt-type solid-liquid separators exclusively utilize the sloped surface at the bottom of the settling tank to collect solid particles to a position where they are transported by a discharge means such as a screw conveyor. , the solid particles were collected by sliding naturally on this slope. According to this method, there was a drawback that in order to increase the throughput of the device, the size of the settling tank had to be increased.

In this regard, with the Hardinge type solid-liquid separator, the inner wall of the drum-type sedimentation tank is used to collect the solid particles that have settled at the bottom of the sedimentation tank to the position of the lifting plate, which is the discharge means for discharging them to the outside of the sedimentation tank. Since the liquid is forcibly transferred by a spiral blade provided in the holder, the sedimentation tank can be small in relation to the amount of treatment, and the entire apparatus can be made compact.

In a rotary solid-liquid separator, the solid particles are lifted by a lifting plate extending in the longitudinal direction of the drum-shaped settling tank, so the liquid in the drum-shaped settling tank is agitated as a whole, and the solid particles are There was a drawback that precipitation was inhibited. In addition, since the belt conveyor is placed outside of the drum-shaped sedimentation tank, the opening formed in the end plate of the drum-shaped sedimentation tank must be large, which reduces the effective volume of the drum-shaped sedimentation tank. I end up. Therefore, in order to sufficiently recover minute solid particles, the drum type settling tank had to be made very large.

In the Hardinge type solid-liquid separator, solid particles are collected in one place in a drum-type settling tank using a spiral blade, and then lifted by a lifting plate.
The agitation of the liquid in the settling tank can be reduced. Therefore, the liquid in the drum-shaped settling tank is relatively quiet, and the settling of solid particles is promoted. Furthermore, since the effective volume of the drum-shaped sedimentation tank is large, even a compact device can sufficiently collect minute solid particles.

As described above, the Hardinge type solid-liquid separator is superior in that it is compact and requires less agitation of the liquid in the settling tank, but the solid particles discharged from the drum-type settling tank have a high water content and become mushy. It was hot. As a result, liquid was scattered around the equipment, creating a problem of deterioration of the working environment.

The solid-liquid separator according to the present invention eliminates the drawbacks of the conventional solid-liquid separator described above, and its purpose is to improve drainage of discharged solid particles and to be able to collect minute solid particles. The object of the present invention is to provide a solid-liquid separator that is compact and causes little agitation of the liquid in the settling tank.

(Means for Solving the Problems) In order to achieve the above object, the solid-liquid separator according to the present invention is configured as follows.

a settling tank having a raw water input part at one end, allowing solid particles in the raw water to settle to the bottom, and having a separated liquid overflow part at the other end; A ribbon screw conveyor comprising ribbon screw blades fixed to a rotating shaft and having a raking direction toward the surface; a plurality of buckets provided circumferentially near one end of the raw water inlet side of the ribbon screw conveyor and rotating together with the ribbon screw conveyor to scoop up solid particles at the bottom of the sedimentation tank; A pressure reducing plate is placed in the sedimentation tank and collides with the raw water introduced into the sedimentation tank, and a pressure reducing plate is placed on the side of the sedimentation tank, the conveyance start end faces into the sedimentation tank, and the conveyance end is located at a higher position than the conveyance start end. and an upwardly sloping belt conveyor for receiving solid particles discharged from the bucket.

(Example) Examples of the present invention will be described below with reference to the drawings.

The solid-liquid separator of this embodiment is used at civil engineering and construction sites to separate water from solid particles such as gravel, sand, and mud. A mixed liquid of gravel, etc. and water (hereinafter referred to as raw water) taken out from the pit during pile driving, excavation work, etc. is separated into gravel, etc. and water by a solid-liquid separator, and the water is circulated again to the pile. Used for punching work, etc.

A ribbon screw conveyor 2 for scraping up settled gravel and the like is arranged in the longitudinal direction of the settling tank 1, which has a substantially rectangular plane. A bucket is provided at one end of the ribbon screw conveyor 2, and a belt conveyor 4 for receiving gravel etc. discharged from the bucket 3 is arranged on the side of the settling tank 1.

A raw water introduction part 6 is provided at one end 5 in the longitudinal direction of the settling tank 1.
is formed, and an overflow part 9 is provided from the other end 7 to allow water separated from gravel etc. to overflow and fall into a gutter 8.

The ribbon screw conveyor 2 has a rotating shaft 10,
A ribbon screw blade 11 having a raking direction facing the raw water inputting part 6 is fixed. Here, the reason why the ribbon screw conveyor 2 is adopted as the screw conveyor is to minimize the agitation of the liquid in the sedimentation tank 1.

Further, the blade width L of the ribbon screw blade 11 is formed to become narrower from one end 5 of the settling tank 1 to the other end 7. This increases as you go from one end 5 to the other end 7 of the settling tank 1, that is, the further away from the raw water input part 6 the settling tank 1 becomes.
Since the thickness of the gravel, etc. that settles at the bottom of the tank becomes thin, the width of the ribbon screw blade 11 is made narrow according to the thickness of the gravel, etc., in order to minimize the agitation of the liquid.

A plurality of buckets 3 are provided circumferentially at the end of the ribbon screw conveyor 2 on the raw water input section 6 side, and one end 5 side of the sedimentation tank 1 in the bucket 3 is directed toward the bucket 3. A ribbon screw blade 12 having a raking direction is provided integrally with the bucket 3. A plurality of drainage holes 14 are formed in the bottom plate 13 of the bucket 3.
During the rotation of the bucket 3, water in the bucket 3 escapes from the drain hole 14 and returns to the sedimentation tank 1.

At one end 15 of the rotating shaft 10, there is a pressure reducing plate 16 for colliding raw water introduced into the settling tank 1 to reduce the pressure.
is fixed, and the other end 17 of the rotating shaft 10 is rotatably supported by a bearing 18 on the sedimentation tank 1.

On the other hand, the ribbon screw blade 11 is provided with a plurality of radial arms 19.
A cylindrical portion 20 protruding from the center of the sedimentation tank 1 is rotatably supported by a support roller 21 on the sedimentation tank 1 .

A sprocket 22 is attached to the tip of this cylindrical portion 20, and rotational force from an electric motor 24 with a reduction gear is transmitted via a chain 23. As a result, the rotating shaft 10, the ribbon screw blade 11, the bucket 3, the baffle plates 25A and 25B, which will be described later, the ribbon screw blade 12, and the pressure reducing plate 16 are rotated together.

In order to suppress the force of the flow of the liquid flowing from one end 5 to the other end 7 of the sedimentation tank 1, and thereby promote the settling of gravel, etc., a disk-shaped baffle plate 25A is installed around the rotating shaft 1, and a ribbon screw is installed. A plurality of donut-shaped baffles 25B are each attached to the inside of the blade 12 at right angles to the longitudinal direction of the settling tank 1. However, the baffle plate consists of the ribbon screw blade 12 and the rotating shaft 1.
0 and calms the flow, and the specific configuration is not limited to this embodiment.

The conveyance start end 26 of the belt conveyor 4 faces into the sedimentation tank 1, and the conveyance end 27 faces the conveyance start end 26.
It is located at a higher position and is slanted upward as a whole. Therefore, water contained in the gravel etc. while being conveyed by the belt conveyor 4 is separated from the gravel etc. and returns to the sedimentation tank 1 again.

On the conveyor belt 28 of the belt conveyor 4, there is a hopper 29 for receiving gravel etc. released from the bucket 3.
A vibrator 30 for vibrating the conveyor belt 28 is disposed next.

This vibrator 30 is for promoting separation of water and gravel on the conveyor belt 28, but may be omitted depending on the case.

Side 3 facing the conveyance end 27 in the hopper 29
1 has a pointed tip. This is because the water separated from the gravel, etc. flows on the top surface of the gravel, etc., but by reducing the impact when this water collides with the hopper 29, it is agitated at the hopper 29, and the gravel, etc. becomes water. This also prevents the water from returning to the sedimentation tank 1.

The operation of this embodiment configured as described above is as follows.

Raw water introduced into the sedimentation tank 1 from the center of the cylindrical part 20, that is, the raw water input part 6, collides with the pressure reducing plate 16 and is depressurized, so that the liquid in the sedimentation tank 1 becomes calm.

In addition, the raw water is transferred from the raw water input section 6 to the overflow section 9.
However, the baffle plates 25A and 25B suppress the flow force, calm it down, and promote the settling of gravel and the like.

The water separated from gravel and the like is discharged from the overflow part 9 to the outside of the settling tank 1.

Gravel, etc. that have settled at the bottom of the sedimentation tank 1 are scraped toward the raw water input section 6 by the ribbon screw conveyor 2, and the scraped gravel, etc. is scooped up by the bucket 3 and placed on the belt conveyor 4. is released.

Since the water contained in the gravel, etc. is separated on the conveyor belt 28 and returned to the sedimentation tank 1, the gravel, etc. discharged from the conveyance end 27 of the belt conveyor 4 has a low water content.

The solid-liquid separator according to the embodiment described above is a device that separates gravel, etc. and water at a construction site, but the present invention is not limited to this and is generally used to separate solids and liquids. can.

Furthermore, the solid-liquid separator according to the present invention can also be used to separate solids with large specific gravity and solids with small specific gravity. In this case, solids of high specific gravity are precipitated and scooped out by a bucket, while solids of low specific gravity are allowed to overflow with the liquid. For example, in order to separate sand and mud for aggregate, a mixed solution of water, sand, and mud is poured into a settling tank, the settled sand is scooped up with a bucket, and the mud is overflowed with water. According to this, the moisture content of the discharged sand is low, so there is no need to dry it for a long time at the sand extraction site, and it can be loaded onto a truck and transported immediately, and the baffle plate and pressure reducing plate prevent water agitation. The small amount of sand does not overflow with water, and the collection rate of fine sand is improved.

It can also be used for washing to peel off and separate dirt attached to solids, and the solids that are the object of washing are precipitated in a settling tank, while the dirt is separated from the solids in the settling tank and overflows with the liquid.

(Effect of the invention) According to the present invention, the following effects are achieved.

Since the liquid is separated from the solid particles discharged from the bucket to the belt conveyor and returned to the sedimentation tank, the liquid contained in the discharged solid particles becomes very small. Therefore, there is no possibility of liquid being scattered around the device and deteriorating the working environment.

The solid particles precipitated in the sedimentation tank are forcibly scraped up by the ribbon screw conveyor to the position where they can be scooped up by the bucket, so the solid particles are forced to slide naturally on the sloping inner wall surface of the sedimentation tank to the position of the bucket, etc. Compared to those that are collected, even a small sedimentation tank has good separation efficiency, and the entire device can be made more compact.

Compared to a rotary solid-liquid separator in which a belt conveyor is placed in a sedimentation tank, the effective volume of the sedimentation tank is larger, and minute solid particles can be sufficiently recovered with a compact device.

The pressure reducing plate and the baffle plate suppress and calm the agitation of the liquid in the settling tank, which promotes the settling of solid particles and minimizes the discharge of solid particles from the settling tank together with the liquid. .

[Brief explanation of drawings]

1 is a plan view of a solid-liquid separation device according to an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the device shown in FIG. 1, and FIG. 3 is a plan view of the device shown in FIG. 1. The front view of FIG. 4 is a partially enlarged view of the belt conveyor and settling tank. 1... Sedimentation tank, 2... Ribbon screw conveyor, 3... Bucket, 4... Belt conveyor, 5
... One end of the settling tank, 6... Raw water input part of the settling tank, 7... Other end of the settling tank, 9... Overflowing part of the settling tank, 10... Rotating shaft, 11... Ribbon screw blade, 15 ... One end near the raw water input part side of the ribbon screw conveyor, 16 ... Pressure reduction plate, 25
A, 25B... Baffle plate, 26... Conveyance start end, 27
...Transportation end.

Claims (1)

[Scope of Claims] 1. A sedimentation tank 1 having a raw water input part 6 at one end 5, allowing solid particles in the raw water to settle to the bottom, and having an overflow part 9 for separated liquid at the other end 7; A ribbon screw conveyor 2 configured by fixing to a rotating shaft 10 a ribbon screw blade 11 arranged in the sedimentation tank 1 and having a raking direction toward the raw water input part 6; and a ribbon screw conveyor 2 in the ribbon screw conveyor 2. baffle plates 25A, 25 interposed between 11 and the rotating shaft 10 to calm the flow in the sedimentation tank 1;
B, a plurality of buckets 3 are provided circumferentially near one end 15 of the ribbon screw conveyor 2 on the side of the raw water input section 6, and rotate together with the ribbon screw conveyor 2 to scoop up solid particles at the bottom of the sedimentation tank 1. , a pressure reducing plate 16 arranged in the settling tank 1 and against which the raw water introduced into the settling tank 1 collides; and a conveying start end 26 arranged on the side of the settling tank 1.
facing into the sedimentation tank 1, the conveyance end 27 is located at a higher position than the conveyance start end 26, and the belt conveyor 4 is inclined upward to receive the solid particles discharged from the bucket 3. Liquid separation device.