JPS61111798A - Sludge dehydrating device - Google Patents

Abstract

PURPOSE:To make a device compact by supplying a dehydrated filtrate of a dehydrating roll of the upper stage, onto a turning part of a filter cloth belt of a dehydrating roll of very other lower stage. CONSTITUTION:When filter cloth belts 2a, 2b which have pinched a cake 1 are pressed by a dehydrating roll 3-3 of the third stage from below, the rolls 3-3, 3-1 are provided so that its dehydrated filtrate drops down onto a turning part 5 of the dehydrating roll 3-1 of every other lower stage. In the same way, a roll 3-5 is provided against the roll 3-3 of every other lower stage. Also, a roll 3-4 of the fourth stage from below is also placed so that its filtrate drops down to a turning part 6 of a roll 3-2. The turning parts 5, 6 do not absorb the dropped filtrate, therefore, a filtrate receiver 4 is provided on only the lowest end of odd and even number rolls. Accordingly, the device is simplified and made compact.

Description

Detailed Description of the Invention (Industrial Application Field) This invention involves sandwiching a cake to be dehydrated between two endless filter cloth belts, and applying tension to the cloth belts around the dewatering roll. The present invention relates to a belt press type sludge dewatering device which compresses and dewaters the cake sandwiched between the belts using the surface pressure generated at that time, and then separates the belt between the belts and peels the dehydrated cake from the belt.

(Prior art) As shown in Fig. 3, a plurality of dewatering rolls 3-7 are arranged in a staggered manner in the vertical direction with both belts sandwiching the cake to be dewatered between two filter cloth peltoms, λb. ,3-2.3-3...
・The filter cloth is stretched alternately at 3% and meandering in the horizontal direction, compressing the cake l sandwiched between them by the surface pressure received when turning around about half the circumference of each dewatering roll. A sludge dewatering device for dewatering is known.

(Problem to be solved by the invention) In this case, the filtrate b dehydrated when passing through each dehydration roll
2. A filtrate receiver μ was provided under each dewatering roll to prevent the water from falling onto the filter cloth belt running below and being absorbed by the cake, increasing the moisture content of the cake. Therefore, it is necessary to use a large number of filtrate receivers, making the structure complicated.

(Means for Solving the Problems) Therefore, the present invention removes PI that is dehydrated and falls when a filter cloth belt with a cake sandwiched between them goes around approximately half the circumference of the upper dewatering roll of a sludge dewatering device. It is characterized in that it is supplied onto the turning part of the filter cloth belt which turns around about half the circumference of every other lower dewatering roll.

(Function) At the turning point where two filter cloth belts with a cake sandwiched between them go around half the circumference of the dewatering roll, the cake between them is compressed by surface pressure based on the tension of the filter cloth belt BT located on the outside. . Therefore, even if the dehydrated filtrate is supplied as it goes around the bZ (two filter cloth belts with a cake sandwiched between the dewatering rolls on the second stage), the filtrate will not be absorbed by the cake, but will flow along the surface of the filter cloth belt. Fall.

(Example) In the example shown in FIG.
, the filter cloth belt located on the outside when 2b rotates, the cake lbt is squeezed by the surface pressure of 2b, and the dehydrated p liquid is diverted around the right half of the lowermost dewatering roll J-/ and both belts. so that it falls on the turning lBs0,
Similarly, when the two filter cloth belts with the cake sandwiched between them rotate around the left half of the dewatering roll J-1 in the fourth stage from the bottom, the outer filter cloth belt (outer filter cloth belt) removes the cake with a surface pressure of 2 ccO. The dehydrated P liquid is caused to fall onto the cake that is turned around the left half circumference of the second dewatering roll 3 from the bottom and onto the turning portion t of both belts.

In other words, the filtrate that is dehydrated as it goes around the Z is transferred to the right half of the dewatering rolls in odd-numbered stages from the bottom (g) to the two filter cloth bells with a cake in between). The cake goes around the right half, the turning part of both filter cloth belts! (Two filter cloth bells with a cake sandwiched between them)
The filtrate that is dehydrated as it rotates around the left half of the lower even-numbered dewatering rolls is dropped onto the turning portions of both belts. For this reason, the turning part goes around the right half of the first (or third) dewatering roll J-/(j-J) from the bottom! is located slightly before and below the turning part O around the right half of the third stage (or third stage) dewatering roll 3-3 (or 3-j) from the bottom; and the fourth row, and the turning section J around the even-numbered dewatering rolls J − in the fourth and sixth rows from the bottom.

Therefore, it is sufficient to provide the p-liquid receiver so as to receive the filtrate dewatered from the turning section surrounding the odd-numbered and even-numbered dewatering rolls at the lowest stage.

The embodiment shown in FIG. 2 is an odd-numbered dewatering roll 3-/ from the bottom.
This is a case in which rolls 3-j are placed in the same position with y alignment in the vertical direction, and dewatering rolls 3-u and J-4 in even-numbered stages from the bottom are also placed in the same position with y alignment in the vertical direction. . In this case, a guide plate 7 having a groove-shaped cross section inclined downward to guide the filtrate dehydrated at the turning section around the upper dewatering rolls of the odd-numbered (or even-numbered) stages to the turning section around the lower dewatering rolls is placed above the guide plate 7. The filter cloth belt λα1.2b should be provided below the dewatering roll to prevent the filtrate from falling into the rectilinearly advancing portion of the two filter cloth belts λα1.2b with the cake sandwiched therebetween.

As a result, the door liquid receivers .mu. need only be provided under the odd-numbered and even-numbered lowermost dewatering rolls 3-/3-2.

Of course, the present invention is not limited to the embodiments shown in FIGS. 1 and 2, but can also be implemented in a combined manner, with a part of the structure shown in FIG. 1 and the rest of the structure shown in FIG.

(Effects) In this way, according to the present invention, since there is no need for a core wall in which a liquid receptacle is provided under each dewatering roll, the structure b can be simplified and the entire apparatus can be made compact.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main parts of an embodiment of the present invention, Fig. 2 is a side view of the main parts of another embodiment, and Fig. 3 is a side view of the main parts of a conventional device. , l is the cake, 2α1.2b is the filter cloth belt, j-/, J-2, 3-J... is the dewatering roll,! and t indicate the turning part. Chapter iIl - Third Flash Figure 2

Claims (3)

[Claims] (1) Two filter cloth belts with the cake to be dehydrated sandwiched between them are alternately stretched over multiple dewatering rolls arranged in a staggered manner in the vertical direction and meandered laterally, so that each filter cloth belt In a sludge dewatering device that dewaters a cake using the surface pressure it receives when it rotates around half a circumference of a dewatering roll, the cake is dewatered when filter cloth belts sandwiching the cake around each other around half a circumference of the upper dewatering roll. A sludge dewatering device characterized in that the filtrate that falls is supplied onto the turning section of a filter cloth belt that turns around about half the circumference of every other lower dewatering roll. (2) In the sludge dewatering device according to claim (1),
A sludge dewatering device in which a turning part of a filter cloth belt that goes around about half the circumference of every other lower dewatering roll is located below the turning part of the filter cloth belt that goes around about half a circumference of the upper dewatering roll. (3) In the sludge dewatering device according to claim (1),
Beneath the turning part of the filter cloth belt that goes around about half the circumference of the upper dewatering roll, there is a diagonally downward slope toward the turning part of the filter cloth belt that goes around about half the circumference of every other lower dewatering roll. Sludge dewatering equipment equipped with a filtrate guide plate.