JPH0454802Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dehydrator that separates sludge water generated in a ready-mixed concrete manufacturing plant into sludge and clear liquid using a filter cloth.

[Prior art] In a dehydrator that dehydrates using a filter cloth,
The stock solution is pressurized into the dehydration chamber formed by the filter cloth,
The moisture in the stock solution is filtered by a filter cloth and discharged to the outside from the drain port, while the sludge in the stock solution remains on the surface of the filter cloth and accumulates as a cake. As dehydration progresses, a predetermined amount of cake accumulates on the filter cloth surface and the dehydration speed decreases, the dehydration chamber is opened and compressed air etc. is applied to the back of the filter cloth to peel off the accumulated cake and release it to the outside. After draining, the dehydration chamber is closed and dehydration is restarted.

[Problems that the invention aims to solve] However, the sludge in the sludge water generated at ready-mixed concrete plants, etc. contains a large amount of fine particles, and after dehydration, the dehydration chamber is opened and compressed air is applied from the back of the filter cloth to impact the accumulated cake. Even if the filter cloth is peeled off, fine particles of sludge remain on the filter cloth surface, and even if dehydration processing is continued, it will clog within a short time and the dehydration speed will decrease, so the dehydration chamber must be opened each time. Since it is necessary to discharge the cake, it is time-consuming and causes a decrease in dewatering efficiency.

[Means for Solving the Problems] In view of the above-mentioned points, the present invention provides liquid feeding ports on the top surfaces of the three frame-shaped division bodies located on both sides of the frame-shaped division bodies in order to solve the above-mentioned problems. A drainage port is drilled in the bottom of the divided body located in the center, a filter cloth is stretched between each divided body, and the integrated intermediate body is suspended via a support fixed to a fixed stand. At the same time, a clamping body is provided to clamp the intermediate body from both sides with cylinders, and the stock solution is dehydrated by being pressurized into a dehydration chamber formed by the filter cloth stretched over the clamping body and the filter cloth of the intermediate body. In a dehydrator, the liquid feed pipe connected to the liquid feed port is branched at an appropriate position, and a stock solution supply pipe and a fresh water supply pipe are respectively attached via a control valve, and the upper surface and both sides of the centrally located split body are The injection hole of the injection pipe connected to the compressed air source via the control valve faces the compressed air introduction hole drilled on the upper surface of the clamping body.
The present invention provides a dehydrator characterized in that a gap is provided between the compressed air introduction hole and the injection hole of the injection pipe for drawing in outside air when compressed air is injected.

[Function] In the present invention, by holding the intermediate body made up of three divided bodies with the clamping bodies from both sides,
A closed dehydration chamber is formed between the filter cloth stretched over the intermediate body and the filter cloth stretched over the clamping body. When the control valve of the stock solution supply pipe attached to one of the branched liquid feed pipes connected to the dehydration chamber is opened, the stock solution is forced into the dehydration chamber. Only moisture is filtered from the injected stock solution by the filter cloth, and the water is discharged to the outside from the drain port, and sludge is accumulated in the form of a cake on the filter cloth surface of the dehydration chamber. When a predetermined amount of cake accumulates and the dehydration speed decreases, the control valve of the stock solution supply pipe is closed, the supply of stock solution is stopped, the dehydration chamber is opened, and the injection valve installed above the dividing body and the clamping body is operated. Compressed air is injected from the tube, and the compressed air ejected from the injection hole entrains outside air and becomes a pulse. It is introduced into the interior through the perforations on the upper surface of the dividing body and the clamping body, and impacts the back of the filter cloth almost evenly, causing the filter cloth to Peel the cake from the surface. Thereafter, when the dehydration chamber is closed and the control valve of the fresh water supply pipe is opened, fresh water is supplied to the dehydration chamber. Compressed air is again injected alternately from the dividing body side and from the gripping body side, and when impact is applied to the back surface of the filter cloth a predetermined number of times, the sludge remaining on the surface of the filter cloth is washed out in the fresh water in the dehydration chamber. Once the sludge has been washed out of the filter cloth, the fresh water supply is stopped, and the control valve of the stock solution supply pipe is subsequently closed to restart dehydration.

[Example] An example of the dehydrator of the present invention will be described based on the drawings. Reference numeral 1 denotes a dewatering section main body of a dehydrator for concentrating and dehydrating a stock solution such as sludge water, and is composed of an intermediate body 2 and clamping bodies 3a and 3b that clamp the intermediate body 2 from both sides.

The intermediate body 2 consists of three frame-shaped divided bodies 2a, 2b,
2c, the filter cloth 4 is inserted between adjacent divided bodies and stretched, and the divided bodies 2a, 2b, 2c are integrated with an appropriate fastener.
Reference numeral 5 denotes a liquid feed port for supplying the stock solution, which is drilled on the upper surface of the divided bodies 2a, 2c located on both sides of the three divided bodies 2a, 2b, 2c, and is connected to a liquid feed pipe 6 branched at an appropriate position. A stock solution supply pipe 8 is connected to a stock solution injection pump (not shown) via a control valve 7 on one branched side of the liquid feed pipe 6, and a stock solution supply pipe 8 is connected to a pump (not shown) for injection of stock solution via a control valve 9 on the other side. A fresh water supply pipe 10 is connected to a fresh water injection pump (not shown). Reference numeral 11 denotes a liquid drainage port formed in the centrally located divided body 2b, and after the moisture of the stock solution press-fitted through the liquid feeding port 5 passes through the filter cloth 4, it is discharged to the outside through the liquid drainage port 11. .

Clamping bodies 3a and 3b that clamp the intermediate body 2 from both sides
is a lid-shaped holding part 3 that matches the frame-shaped intermediate body 2;
c, and the filter cloth 12 is stretched over the opening of the clamping part 3c with an appropriate fixing device, and
A drain port 13 for discharging the filtrate is bored in the lower surface, and the filter cloth 12 of the clamping part 3c and the filter cloth 4 of the intermediate body 2 are connected to each other.
A dehydration chamber 14 is formed which is closed by.

Reference numeral 15 denotes a fixed base that supports the dewatering section 1, and the intermediate body 2 is suspended via a support rod 17 attached to the lower end of a support 16 fixed to the fixed base 15. The upper end of the support rod 17 is rotatably connected to a horizontal rod 19 fixed to both ends of a pin 18 passing through a pair of supports 16, and the lower end of the support rod 17 is mounted oppositely to the upper part of the intermediate body 2. The intermediate body 2 is pivotally connected to a pin 21 passing through the projecting pieces 20, 20, and the intermediate body 2 is connected to the support rod 1.
7 can swing freely in the left and right directions using the upper end pivot point as a fulcrum.
Further, it can swing freely in the front and rear directions using the lower end pivot portion of the support rod 17 as a fulcrum.

The clamping bodies 3a and 3b are a pair of support frames 2 rotatably supported on a support body 16 via a pin 18.
2 and 22' via pins 23 and 23', and are pivotally supported to support frames 22 and 22' so as to be freely swingable.
Reference numeral 24 denotes a cylinder fixed to the fixed base 15, and a pair of drive links 26, 26' pivotally supported at the tip of the piston rod 25 of the cylinder 24 are connected to the joint points of the driven links 27, 28 and 27', 28'. One end of the driven links 27', 27' is pivotally connected to the support body 16 via pins 29, 29, and the other end is connected to the support frame 22, 22 through a pin 3.
0,30', and the cylinder 2
By extension of the piston rod 25 of 4, the intermediate body 2
is held between the holding bodies 3a and 3b, and the piston rod 2 is
The clamping is released by reducing the number 5.

A pipe 31 connected to a compressed air source (not shown) is disposed at a position slightly above the divided body 2b and the clamping portion 3c located at the center of the intermediate body 2.
1 is branched into three directions, and has control valves 32a, 32b, 3
Injection pipes 33a, 33b, and 33c are connected via 2c. Respective injection pipes 33a, 33b, 3
In the lower part of 3c, injection holes 34a, 34b, 34c are provided at appropriate intervals to separate and eject compressed air.
are arranged in a row. In addition, the divided body 2 located in the center
b and the upper surface of the clamping portion 3c are provided with the injection holes 34.
Compressed air introduction holes 35a, 35b, and 35c are arranged in a row at positions facing a, 34b, and 34c.

Therefore, when dehydrating the sludge by separating it from the stock solution containing the sludge, the cylinder 2
The piston rod 25 of 4 is extended, the support frames 22, 22' are rotated via each link, the intermediate body 2 is clamped by the clamping bodies 3a, 3b, and the filter cloth 4 of the intermediate body 2 and the filter of the clamping part 3c are The control valve 7 is opened into the dehydration chamber 14 formed by the cloth 12, and the stock solution is forced into the stock solution supply pipe 8 to start dehydration. Filter cloth 4,1
The water filtered by the intermediate body 2 and the clamping part 3
c It is discharged from the drain ports 11 and 13 on the lower surface, and the sludge in the stock solution accumulates as a cake A on the surfaces of the filter cloths 4 and 12. When the cake A accumulates and the dehydration speed decreases, the control valve 7 is closed, the supply of the stock solution is stopped, the piston rod 25 of the cylinder 24 is contracted, the dehydration chamber 14 is opened, and the intermediate body 2 and the clamping part 3 are closed.
Injection pipes 33a, 33b, 33 arranged above c
The control valves 32a, 32b, 32c of c are opened,
Compressed air is ejected from the injection pipes 33a, 33b, and 33c, and the compressed air, which is made to wave in pulses by drawing in outside air, is introduced into the interior through the compressed air introduction holes 35a, 35b, and 35c on the upper surfaces of the intermediate body 2 and the clamping body 3c. , an impact is applied to the back of the filter cloths 4, 12, and the filter cloths 4, 12 are shocked.
Cake A on 12 sides is peeled off and discharged to the outside.
After discharging the cake A, the piston rod 25 of the cylinder 24 is expanded to close the dehydration chamber 14 and open the control valve 9 of the fresh water supply pipe 10.The control valve 9 of the fresh water supply pipe 10 is opened to supply fresh water to the dehydration chamber 14. supply. When the dehydration chamber 14 is filled with fresh water, the control valves 32b and 3 of the injection pipes 33b, 33a, and 33c are closed.
2a and 32c are alternately opened and closed to open and close the filter cloths 4 and 12.
Pulsed compressed air is sent alternately from the intermediate body 2 side and from the holding part 3c side to the back surface of the filter cloth 2 and impact is applied a predetermined number of times to wash out the residual sludge on the surfaces of the filter cloths 4 and 12 into clean water. After cleaning the filter cloths 4 and 12, the stock solution is supplied again from the stock solution supply pipe 8 to restart dehydration.

In this way, during the dehydration process, cake A is placed in the dehydration chamber 14.
If the water accumulates and the dehydration speed decreases, the dehydration chamber 14 is opened, the cake A is peeled off with compressed air, the dehydration chamber 14 is closed, fresh water is supplied, and pulsed compressed air is again applied to the filter cloth 4, Alternately act on the back of 12,
Wash the filter cloths 4 and 12 in clear water by flapping them,
After washing out the remaining sludge, the undiluted solution is supplied and the dehydration process is restarted.

[Effects of the invention] In the present invention, the liquid supply pipe connected to the dehydration chamber is branched, the stock solution supply pipe is connected to one end, and the fresh water supply pipe is connected to the other, and compressed air is introduced into the upper surface of the dehydration part. By arranging a hole and an injection pipe with a compressed air injection hole facing the hole, and creating a gap between the injection pipe and the compressed air introduction hole to draw in outside air when compressed air is injected, dehydration can be achieved. After opening the chamber and peeling and discharging the cake, when pouring clean water into the dehydration chamber to clean the filter cloth, compressed air is intermittently injected toward the compressed air introduction hole to pulse the outside air. It can be sent impactfully to the back side of the filter cloth while making waves, and the cake residue adhering to the filter cloth surface can be thoroughly washed out in the clean water by shaking the filter cloth surface violently in the clean water. Due to this,
The time until the filter cloth surface becomes clogged with sludge becomes longer, and more efficient dewatering can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional front view of the dewatering section, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a vertical sectional front view of the dewatering section during cake discharge, and FIG. 4 is a partially vertical front view of the dehydrator. 1...Dehydration part, 2...Intermediate, 2a, 2b, 2
c...Divided body, 3a, 3b...Holding body, 3c...
Clamping part, 4, 12...filter cloth, 5...liquid feeding port, 6...
...Liquid feed pipe, 7, 9...Control valve, 8...Standard solution supply pipe, 10...Fresh water supply pipe, 11, 13...Drain port, 14...Dehydration chamber, 32a, 32b, 32c...
...Control valve, 33a, 33b, 33c...Injection pipe,
34a, 34b, 34c... injection hole, 35a, 3
5b, 35c... Compressed air introduction hole.

Claims (1)

[Scope of utility model registration request] A liquid feeding port is provided on the top surface of the divided body located on both sides of the three frame-shaped divided bodies, and a liquid drainage port is provided on the bottom surface of the divided body located in the center, and a filter cloth is placed between each divided body. The stretched and integrated intermediate body is suspended via a support fixed to a fixed base, and a clamping body is provided to clamp the intermediate body from both sides by cylinders,
In a dehydrator that dehydrates stock solution by pressurizing it into a dehydration chamber formed by the filter cloth stretched on the clamping body and the intermediate filter cloth, the liquid feeding pipe connected to the liquid feeding port is placed at an appropriate position. At the same time, a control valve is connected to the compressed air source through the compressed air introduction hole drilled on the upper surface of the divided body located in the center and on the upper surface of both supporting bodies. A dehydrator characterized in that an injection hole of an injection pipe that communicates with the injection pipe is exposed, and a gap is provided between the compressed air introduction hole and the injection hole of the injection pipe for drawing in outside air when compressed air is injected.