JPS5817720B2 - Continuous "filter" overpressure dehydration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement of a filtration press, particularly a continuous filtration press dewatering device that performs filtration and squeezing by gradually narrowing the interval between running p cloth bands that enclose slurry therebetween. Regarding.

Therefore, in this invention, the slurry is stored by folding the ends of the furnace cloth that circulates between the filtration and compression operation areas, and the slurry is compressed by pressing the furnace cloth from both sides. A pair of belts are provided to guide the furnace cloth so that the slurry does not leak from the furnace cloth, and from the slurry supply device located at the upstream end of the working area and from the E cloth exiting the downward end of the working area. A device is installed to scrape off the cake.
In the continuous filtration and squeezing device that filters and squeezes slurry by successively narrowing the pressing interval of the oven cloth in the operating area, the squeezing operation section is configured such that the oven cloth 4 runs in a U-shape along both operation sections. A furnace cloth 4 wrapped with slurry is sandwiched between belts 5 and 6 of the central drive section 1 and right drive section 2 of A, and an inner box 7 and an outer box 8 are placed inside the belts 5 and 6.
An internal pressure bag 10 is fitted into the inner box 7 of the pressurizing unit 9, and the internal pressure bag 10 is communicated with an internal pressure tank to maintain atmospheric pressure at all times. The above internal pressure is maintained, the outer box 8 encloses the inner box 7, and the internal pressure is communicated with the external pressure tank via a switching valve to change the pressure of the external pressure tank and atmospheric pressure, The seal portion 11 in contact with the belts 5 and 6 at both ends of the outer box 8 has a seal tube 12 installed therein connected to a seal tank having a higher pressure than the external pressure tank of the outer box 8 through a switching valve. The outer box 8 is sealed to prevent the internal pressure from leaking, and when the outer box 8 is at atmospheric pressure, the seal tube 12 is also switched to atmospheric pressure. Both sides of the belt, which moves up while holding the furnace cloth, are pressed by air pressure or other means in a pressurizing section consisting of an inner box and an outer box, and the water in the slurry is sufficiently dehydrated to form a continuous cake. It was devised so that it could be taken out in a shape.

Hereinafter, one embodiment of the present invention will be described.

In FIG. 1, A is a pressing operation section, and a central drive section 1 has a furnace cloth 4 receiving belt 5 attached to upper and lower boots IJ-22, 23.
The right drive unit 2 is configured to suspend the upper and lower boots IJ-24, 2.
The left drive part 14 of the filtration operation part B has a furnace cloth 4 support belt 15 suspended between the upper and lower boobies IJ-26 and 27, and the furnace cloth 4 is folded. Layer slurry 3
to the right side of the left drive section 14 and the left side of the center drive section 1.

It is held in place and descends so that it is wide at the top and narrow at the bottom.

While removing the moisture from the furnace, the furnace cloth 4 bypasses the lower side of the pulley 23 of the central drive section 1 and is held between the right side of the central drive section 1 and the left side of the right drive section 2 so that the upper part becomes narrower, and rises. Slurry 8
is further compressed by the following pressing device to form a cake 35, which bypasses the upper part of the pulley 24 of the right drive section 2, removes the cake 35, and passes through the roller 29° furnace in the lower furnace cloth washer 28. The cloth 4 passes through the length adjustment roller 30, oven cloth tension roller 31, and guide rollers 32, 33, returns to the upper left side of the central drive section 1, injects the slurry 3, and repeats the above operation. .

Then, as described above, the tear overactuation part B where the furnace cloth moves downward
The furnace cloth 4 is pressed and clamped so that the upper part is wider and the lower part is narrower, and the squeezing operation part A, which moves upward from the center part, presses and clamps the upper part more narrowly than the lower part, and dehydrates the water in the slurry 3. However, in order to further enhance the dewatering effect by pressing, a pressure pressing section 9 is provided in the pressing operation section A.

As illustrated in FIG. 2, the pressurizing section 9 consists of an inner box 7 that slides on the inside of the belts 5 and 6 that sandwich the furnace cloth 4 wrapped around the slurry 3, and an outer box 8 that is slightly larger than the inner box 7. , inner box 7
An internal pressure bag 10 is fitted in the internal pressure bag 10.
is connected to an internal pressure tank (not shown) via piping or the like, so that the pressure is always maintained above atmospheric pressure.

The inner surfaces of the belts 5 and 6 of the above-mentioned furnace cloth 4 holders have uneven surfaces that serve as passages for the squeezed liquid, and the surfaces of the furnace cloth 4 holders of the internal pressure bag 10 that contact the belt do not stick to the belt due to the pressurizing force. It is possible to form a rough surface with appropriate unevenness.

The outer box 8 encloses the entire inner box 7 and is configured so that the inner box 7 can be moved by a predetermined interval, and the pressure inside the outer box 8 is switched between the internal pressure of the pressure tank and atmospheric pressure by a switching valve 13. do.

The seal portion 11 that contacts the belts 5 and 6 of the outer box 8 has a seal tube 12 therein, and the seal tube 12
is connected to a seal tank (not shown) having a higher pressure than the pressure tank using a switching valve 13' or the like to prevent the internal pressure of the outer box 8 from leaking.

Note that the switching of the switching valve 13' described above is performed using the internal pressure switching valve 1 of the outer box 8.
It is possible to synchronize with 3.

Therefore, when the internal pressure inside the outer box 8 and the internal pressure of the seal tube 12 are atmospheric pressure, the internal pressure bag 10 of the inner box 7 causes the furnace cloth 4 holder to absorb the slurry 3 through the belts 5 and 6. While being squeezed, the slurry 3 rises together with the belts 5 and 6, and the liquid content of the slurry 3 passes through the furnace cloth 4, and the furnace cloth 4 and the furnace cloth 4 receiver flow down and separate at the bottom through the groove passage between the belts 5 and 6. be done.

Thus, when the inner box 7 reaches a predetermined position, the pressure inside the outer box 8 is made approximately equal to the pressure in the internal pressure bag 10 of the inner box T by the switching valve 13 of the pressure tank connected to the outer box 8, and the pressure inside the outer box 8 is made approximately equal to the pressure in the internal pressure bag 10 of the inner box T. The seal tube 12 of No. 8 is also connected to the high pressure seal tank by a switching valve 13'.

The inner box I is pressed to prevent the internal pressure of the outer box 8 from leaking.
If the difference between the internal pressures between the bag 10 and the outer box 8 is 0, the pressure inside and outside the inner box 7 is balanced.

The inner box T is able to move within the outer box 8 without pressure resistance while pressing the belts 5 and 6, and is moved in the opposite direction to the moving direction of the furnace cloth 4 support belts 5 and 6 by the urging of the reciprocating mechanism 34 such as a cylinder. The inner box 7 can be pulled back to the side without being moved.

Since the inner box 1 and the internal pressure bag 10 are constantly pressurized,
When the pressure of the outer box 8 and the seal tube 12 of the outer box 8 is switched to atmospheric pressure and reduced, the above state returns and the above operation is repeated.
The internal pressure bag 10 moves together with the furnace cloth 4 receiving belts 5 and 6 while always maintaining a compressed state.

A limit switch (not shown) is provided on the piston rod of the reciprocating mechanism 34, and when the inner box 7 rises to the upper limit of the outer box 8, the limit switch is activated.

Until the inner box 7 descends to the lower limit of the outer box 8, the belt 5
, 6 may be momentarily interrupted.

Even while repeating this intermittent operation, the internal pressure bag 10 can continue to uniformly squeeze the slurry 3.

In addition, as another embodiment, when processing a slurry 3 with a large amount of water, the compressor cloth 4 receiving belt of the left drive section 14 of the filtration operation section B, in which the furnace cloth 4 moves downward, as shown in FIG. 1
5 is provided with liquid holes 17, 17..., and a furnace cloth 4 in which slurry 3 is wrapped between the belt 15 and the belt 5 of the central drive section
The furnace cloth 4 is opened at the upper part 16 so that the slurry 3 can be injected, and the suction inner box 18 is moved to the inner surface opposite to the surface of the belt 15 that contacts the furnace cloth 4 at a predetermined distance. The inner suction box 1 is slidably brought into contact with the inner surface of the belt 15 at the sealing surface 20, and the outer box 19 is covered so as to cover the inner surface of the belt 15.
8 always maintains a vacuum state.

The pressure inside the outer box 19 is changed between atmospheric pressure and vacuum by a switching valve 21, and when the pressure inside the outer box 19 is atmospheric pressure, the suction inner box 18 sucks moisture in the slurry and moves along with the belt 15. When the inner suction box 18 descends and reaches a predetermined position, the internal pressure of the outer box 19 is reduced to a vacuum, so that the difference in internal pressure between the inner suction box 18 and the outer box 19 becomes 0, and the inner suction box 18 and the belt 15 is released, the suction inner box 18 is moved to the opposite side of the traveling direction of the belt 15 by a suitable reciprocating mechanism 34 such as a cylinder, and then the outer box 1
The internal pressure of the box 9 is made equal to the atmospheric pressure by the switching valve 21, and the difference between the inside and outside pressures becomes O, and the suction between the outer box 19 and the belt 15 is released, and the suction inner box 18 is attracted to the belt 15, and the above operation is repeated. It is something to do.

Therefore, the vacuum filtration device in the filtration operation section B is particularly effective when processing slurry 3 with a high water content;
It is not an inseparable device from the pressure compression device of the compression operation section connected to this.

In addition, the inner box 7 and the outer box 8 in the squeezing operation section are as follows.

As shown in FIG. 3, the cloth holder is open only at the part through which the belt passes, and both sides can be firmly attached with screws or the like so as to hold the belt.

Above, we talked about the double pressure change in the inner box and the outer box, but the inner box and the middle box.

With this same mechanism, even in the case of triple or multiple outer boxes, etc.
It is also possible to have a multiplexed configuration that is more suited to the object to be processed.

In the present invention, as shown in the diagonal top, the squeezing operation section performs the squeezing operation based on the pressure difference between the double box consisting of the inner box and the outer box, and the internal pressure of the inner box is always kept in the squeezing state, and the outer box The internal pressure of the belt is changed using a switching valve to match the internal pressure of the outer box with the internal pressure of the inner box, and the inner box is moved in the opposite direction to the traveling direction of the belt within the outer box. By switching the internal pressure of the outer box to atmospheric pressure, the inner box moves along with the belt while compressing the slurry, and these operations are repeated.

The slurry is squeezed and water is continuously removed from the slurry.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention; FIG. 1 is an explanatory diagram of the overall mechanism, FIG. 2 is a detailed explanatory diagram of the pressurizing section, FIG. 3 is a cross-sectional view taken along line E in FIG. 2, and FIG. FIG. 4 is a detailed explanatory diagram of the p oversuction part, and FIG. 5 is a sectional view taken along the Rolo line in FIG. 4. Explanation of symbols, 1...Central 1 drive section, 2...
・Right side, drive section, 3...slurry, 4...
...? Cloth, 5, 6... Belt, I...
Inner box, 8... Outer box, 9... Pressure pressing section, 10... Internal pressure bag, 11... Outer box sealing section, i2. ...Seal tube, 13,
13'...Switching valve, 14...Left drive section, 15...Belt. 16... upper part of furnace cloth, 17... filtrate L18... suction inner box, 19... outer box,
20... Seal surface. 21...Switching valve-22, 23...Central drive part boo 1J-124, 25...Right drive part pulley, 26.27...・Boot IJ-128 on the left drive section... Furnace cloth washer, 29...
...Roller, 30...Adjustment roller, 31.
...Reciprocating mechanism, 32, 33... Guide roller, 34... Reciprocating mechanism, 35...
... Cake, A ... Squeezing operation part, B ...
...Filtration operation part.

Claims (1)

[Claims] 1. Both ends of a furnace cloth that circulates between the filtration and compression operating areas are folded over each other to accommodate the slurry, and the furnace cloth is pressed from both sides to compress the slurry, and the slurry is A pair of belts are provided to guide the oven cloth so that it does not leak from the oven cloth, and a slurry supply device located at the upstream end of the working area and a slurry feeder which removes cake from the oven cloth exiting the downward end of the working area. In a continuous filtration and squeezing device that is provided with a scraping device and filters and presses the slurry by successively narrowing the pressing interval of the oven cloth in the operating area, the oven cloth 4 is configured to run in a U-shape along both operating sections. A furnace cloth 4 wrapped with slurry is sandwiched between the belts 5 and 6 of the central drive section 1 and the right drive section 2 of the squeezing operation section A configured as shown in FIG. Pressure pressing unit 9 configured as one unit with
Equipped with. An internal pressure bag 10 is fitted into the inner box 7 of this pressurizing section 9, and the internal pressure bag 10 is communicated with an internal pressure tank to maintain an internal pressure higher than atmospheric pressure at all times. It is encapsulated and its internal pressure is controlled through a switching valve. It communicates with an external pressure tank to change the pressure of the external pressure tank and the atmospheric pressure, and the seal portion 11 that contacts the belts 5 and 6 at both ends of the outer box 8 switches the seal tube 12 that can be installed inside. It is connected via a valve to a seal tank having a higher pressure than the external pressure tank of the outer box 8, and is sealed to prevent the internal pressure of the outer box 8 from leaking, and when the outer box 8 is at atmospheric pressure, the seal tube 12 A continuous filtration press dehydration device characterized in that the pressure is switched to atmospheric pressure.