JPS5966683A - Belt press type dehydrator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an endless belt-shaped first filter cloth which is rotatably provided and which performs a pressure dehydration process on a processed material placed on the first filter cloth and supplied. This invention relates to a belt press type dehydrator in which a second filter cloth is rotatably provided.

In the above-mentioned dehydrator, when the material to be processed is subjected to pressure dehydration using the first and second filter cloths, it has been generally believed that the more uniform the thickness of the material to be processed in the running direction of the filter cloths, the higher the dewatering efficiency. For example, in a cake thickness adjustment roll for making the thickness uniform in the width direction of the filter cloth, the material to be processed on the filter cloth is temporarily retained on the upper side of the roll, and the material to be treated on the filter cloth is temporarily retained on the upper side of the roll, and the material to be processed is pushed in by the roll to uniformize the thickness in the width direction of the filter cloth. The thickness of the object to be processed on the filter cloth was made to be uniform in both filter cloth running directions.

An object of the present invention is to improve upon the above-mentioned conventional concept and to make it possible to sufficiently reduce the water content of a treated material through simple improvements.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A mixer (3) is provided to coagulate and mix the material to be treated supplied from the first storage tank (1) and the flocculant supplied from the second storage tank (2), and A gravity dewatering section (5) is attached to the cloth (4), and concentrated sludge is sandwiched between the gravity dewatering section (5) and the second rotary filter cloth (6) on the lower side in the rotating direction. A clamping part (7) is provided for forced dehydration by pressing, and as the first and second rotary filter cloths (4) and (6) rotate, various types of wastewater, such as human waste, urban sewage, or industrial wastewater, are collected. The belt press type dehydrator is configured to continuously dewater treated materials such as sludge generated during water treatment.

The pinching section (7) is composed of a constrictive dehydration zone (A) with a linear path and a compressive dehydration zone (B) with a large diameter arcuate path.
, and a shear dewatering zone (C) with a meandering path, and is configured to sequentially increase the squeezing force by the first and second rotating filter cloths (4) and (6).

At a location on the upper side of the clamping part (7) in the filter cloth traveling direction, the cake thickness adjusting roll (8) is adjusted so that its circumferential speed is adjusted so as to act on the object to be treated on the first filter cloth (4). The first filter cloth (4) is provided so that it can be driven and rotated in the same direction at a speed higher than the traveling speed, and the thickness of the material to be treated to be supplied to the pinching part (7) is adjusted by the first filter cloth (4).
) is configured to be uniform in the width direction.

The cake thickness adjusting roll (8) is provided with a braking mechanism (9) consisting of a brake drum (9a) connected to the rotating shaft (8a) of the roll (8) and a brake shoe (9b) for the brake drum (9a).
), and the braking mechanism (9) is equipped with a solenoid valve (
10) is attached, and a timer (12) is linked to the solenoid valve (10) to operate the braking mechanism (9) for a predetermined period of time at predetermined intervals, and to perform braking. At the same time, the material to be processed on the filter cloth (4) is prevented from passing under the cake thickness adjusting roll (8) and supplied to the pinching part (7) side, and the braking state is intermittently repeated. A thickness changing mechanism (13) is configured to change the thickness of the object to be processed on the first filter cloth (4), which is supplied to the pinching part (7), in the filter cloth running direction.

Fig. 3 shows another embodiment of the thickness changing mechanism (13), which is provided with a receiving tank (14) for receiving the material to be processed from the mixer (3), and a supply port (14) connected to the lower part of the receiving tank (14). 15
) is provided with an on-off valve (16) that opens and closes intermittently in conjunction with the timer (12) as described above, so that the material to be treated is intermittently supplied onto the first filter cloth (4), and the gravity The thickness of the processed material conveyed from the dewatering section (5) on the first filter cloth (4) is changed in the traveling direction of the filter cloth.

In this case, it is preferable not to provide the cake thickness adjusting roll (8).

FIG. 4 also shows another embodiment of the thickness changing mechanism (13), in which a stopper (17) is provided on the lower side of the cake thickness adjusting roll (8) in the cloth running direction and is slidable up and down. ) is linked to the timer (12) in the same way as in the above case, and the stopper (17) is intermittently slid up and down, and is lowered to the position above the first filter cloth (4). The state of action is to prevent the movement of the object to be processed, and the object to be processed is placed in an elevated position above the object to be processed on the first filter cloth (4), and the object to be processed is placed on the first filter cloth (4) and compressed. The deactivation state in which the pressure is transferred to the part (7) side appears intermittently, and the pinching part (
7) is configured to change the thickness of the material to be processed on the first filter cloth (4) in the traveling direction of the filter cloth.

In configuring the thickness changing mechanism (13), the present invention includes:
Any device that changes the thickness at least in the running direction of the filter cloth may be used.For example, a rod is provided with the tip extending into the object to be treated on the first filter cloth (4), and the rod is moved in the width direction of the filter cloth. It is provided so that it can be driven back and forth, and forms a meandering groove in the object to be treated on the first filter cloth (4) so that the thickness of the object to be treated changes both in the running direction of the filter cloth and in the width direction of the filter cloth. Various structural modifications are possible.

In summary, the present invention provides the belt press type dehydrator described above, at a location on the upper side in the running direction of the filter cloth than the pinching portion (7) formed by the first and second filter cloths (4) and (6). The present invention is characterized in that a thickness changing mechanism (13) is provided for changing the thickness of the material to be processed on the first filter cloth (4) that is supplied to the first filter cloth (4) at least in the traveling direction of the filter cloth.

In other words, after various experiments and considerations regarding the mechanism of pinch pressure dehydration treatment, we found that the filter cloth (
4) When the thickness of the object to be treated changes, the pressure applied by both filter cloths (4) and (6) increases rapidly in areas with a large thickness distribution, and it also applies to areas with a small thickness. It was discovered that it was possible to increase the pressure on the object to be processed as much as possible.Based on this fact, Ichirofu (
4) The above object to be treated is fed to the clamping section working in cooperation with the second filter cloth (6), with its thickness varying in the filter cloth running direction, and subjected to clamping dehydration treatment.

Therefore, without being bound by conventional ideas, by adding a knife to the process, the material to be processed can be supplied intermittently.
A braking mechanism (9) is attached to the cake thickness adjusting roll (8) and the braking mechanism (9) is operated intermittently, or a stopper (17) is attached and the braking mechanism (9) is switched to an operating state intermittently. Through simple improvements, the pressure exerted by both filter cloths (4) and (6) on the material to be processed has been significantly increased, making it possible to sufficiently overcome the decrease in water content of the material to be processed due to pressure dehydration. .

[Brief explanation of the drawing]

The drawings show an embodiment of a belt press type dehydrator according to the present invention, in which FIG. 1 is a schematic vertical cross-sectional view of the whole, FIG. 2 is an enlarged cross-sectional view of the main part, and FIGS. 3 and 4 are different embodiments. FIG. (4)...First filter cloth, (6)...Second filter cloth
Filter cloth, (7)...Press section, (8)...
Cake thickness adjustment roll, (9)...braking mechanism, (
13)...Thickness changing mechanism, (17)...
·stopper.

Claims (4)

[Claims] (1) An endless strip-shaped first filter cloth (4) is rotatably provided, and an endless strip-shaped second filter cloth (4) is placed on the first filter cloth (4) and performs pressure dehydration on the material to be processed. A belt press type dehydrator in which a filter cloth (6) is rotatably provided, and the filter cloth is located on the upper side in the running direction of the filter cloth than the pinching part (7) formed by the first and second filter cloths (4) and (6). A belt press characterized in that a thickness changing mechanism (13) is attached at a certain point to change the thickness of the material to be processed on the first filter cloth (4) that is supplied therein at least in the filter cloth running direction. type dehydrator. (2) The thickness changing mechanism (13) is configured to intermittently supply the material to be treated to the first filter cloth (4). dehydrator. (3) The thickness changing mechanism (13) is configured by rotatably providing a cake thickness adjusting roll 8 that acts on the object to be treated on the first filter cloth (4), and attached to the roll (8). The dehydrator according to claim 1, wherein the braking mechanism (9) is operated intermittently. (4) The thickness changing mechanism (13) includes a stopper (17) that acts on the object to be treated on the first filter cloth (4).
) is provided so that the action can be released freely, and the stopper (17)
Claim No. 1 (1) which acts intermittently
Dehydrator described in ).