JPH03217209A - Caterpillar press type electroendosmotic dehydrator - Google Patents

Abstract

PURPOSE:To prevent the filter cloth from meandering and running-off from the caterpillar press belt by providing correcting rollers which push the surface of filter cloth and spread the filter cloth laterally, at least to the delivery side of a tension guide roller. CONSTITUTION:Confronting electrodes consist of a rotary drum 1 and the caterpillar press belt 2 disposed along a part of the periphery of the drum 1 with the endless filter cloth 3 put on it, and sludge 15 is supplied into the passage between the confronting electrodes to carry out dehydration. Guide holes 3b perforated in the side belt 3a provided to the filter cloth 3 are engaged with the guide pins erected on both sides of the belt 2 to combine the filter cloth with the belt, but a part of the rounding filter cloth 3 is separated from the belt 2 to hang the filter cloth 3 to the tension guide roller 12. The correcting rollers 18 are provided at least to the delivery side of the roller 12 which push the surface of the filter cloth 3 and spread the filter cloth 3 laterally. As a result, such apprehension that the filter cloth is prevented from meandering or running-off from the belt 2 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a caterpillar press type electroosmotic dehydrator for dewatering excess sludge etc. generated in a sewage treatment plant.

(Prior Art) First, Fig. 6 and Fig. 7 show the conventional structure of a caterpillar press type electroosmotic dewatering device to which the present invention is implemented.In the figures, 1 is a rotating drum, and 2 is a peripheral area of the rotating drum. An endless caterpillar press belt is laid around a part of the press belt, 3 is an endless filter cloth superimposed on the circumference of the press helt 2, 4 is a belt drive motor, and 5 is a straight 2
6 is a sludge supply hopper.

Here, the caterpillar press belt 2 is the sprocket 7
As shown in FIG. 7, guide pins 2a that engage with the filter cloth 3 are planted at regular pinch intervals on both the left and right sides of the press helt, as will be described later. It is set up.

On the other hand, the filter cloth 3 is a flexible, water-permeable cloth made of a cloth such as nylon fiber and has a thickness of about 1 m, and is reinforced by attaching resin side hems 3a to its left and right edges, and Guide holes 3b that engage with the guide pins 2a are bored at regular intervals in the side belt 3a. Then, the filter cloth 3 is attached to the caterpillar press belt 2 by engaging the guide hole 3b with the guide pin 2a on the press helt side.
You will be guided to move around as one.

In addition, the length of the filter cloth 3 is somewhat longer than that of the caterpillar press belt 2, and as shown in the figure, a part of its circumferential area is separated from the caterpillar press belt 2 on the circular movement route, and then the filter cloth 3 is moved to this area. For example, a water jet nozzle 11 is installed toward the electrode surface 2 of the press helt 2 and the back surface of the filter cloth belt 3 to remove solid products such as calcium hydroxide deposited on the electrode surface due to electroosmotic dehydration, and to remove solid products such as calcium hydroxide deposited on the electrode surface due to electroosmotic dehydration. I try to do some cleaning. In order to prevent the filter cloth 3 from loosening, a tension guide roller l2 (the guide pin is indicated by reference numeral 13) with a guide pin equipped with a tension spring is provided in the separation movement area, and the filter cloth 3 is attached to the press helt 2. Auxiliary guide rollers 14 are installed which act to push the filter cloth 3 in a stretched manner between these guide rollers. Such an electroosmotic dehydrator is disclosed in, for example, Japanese Patent Application Laid-open No. 63
This is already known as disclosed in Japanese Patent No. 256112, in which a voltage is applied between the rotating drum 1 and the caterpillar press belt 2, and the drum 1 and the press helt 2 are moved while the drive motor 4 moves the press helt 2 around. When the sludge 15 is supplied through the sludge passage Hehonova 6 defined in the opposing surface area, the sludge 15 is dehydrated by the simultaneous action of mechanical squeezing force and electroosmotic force while being conveyed through the sludge passage. Then, the sludge 15 becomes a dehydrated cake 16 with a low moisture content and is conveyed to the exit side of the sludge passage, peeled off and separated from the press helt by a scraper 17, and discharged out of the system. In addition, solid products deposited on the electrode surface of press helt 2 during dehydration operation. The sludge residue adhering to the filter cloth 3 is washed with water jetted from the washing nozzle 11 during the circulating movement route of the press helt 2.

[Problem to be solved by the invention]

By the way, in the configuration in which a part of the peripheral area of the filter cloth 3 is separated from the caterpillar press belt 2 in the middle of the circular movement route and stretched around the tension guide roller 12, the filter cloth 3 is separated and pressed again from the movement area. When joining and overlapping the belt 2, the guide pin 2a and the guide hole 3a do not mesh well, causing the filter cloth 3 to shift sideways and meander with respect to the caterpillar press belt 2, or in the worst case, press helt 2
This can lead to a situation where the vehicle becomes unable to drive.
A similar problem may occur between the filter cloth 3 and the guide roller 12, and the filter cloth 3 may become disengaged from the guide pin 13 while the filter cloth 3 is rotating around the guide roller 12. The causes of such problems are as follows. That is, as mentioned above, the filter cloth 3 is a thin nylon cloth with a thickness of about lm and easily shrinks when heated, and if the filter cloth is pulled apart from the circumferential surface of the press helt 2 and stretched around the tension guide roller l2, , the filter cloth itself is pulled toward the center by the tension applied to the filter cloth 3, and longitudinal wrinkles are formed on the surface of the filter cloth. For this reason, the side helt 3a of the filter cloth 3 is also drawn to the center, and as a result, the locus of movement of the side belt 3a does not match the positions of the guide pin 2a of the caterpillar press belt 2 and the guide pin 13 of the guide roller l2, and the guide pin 13 of the guide roller l2 is not guided. The hole 3b and the opposing guide pins 2a, 13 do not mesh well.

The present invention has been made in consideration of the above points, and is intended for the electroosmotic dewatering machine having the above-mentioned configuration.In the circulating process in which the filter cloth that has been separated from the caterpillar press belt is rejoined to the caterpillar press belt, Press belt side. Another object of the present invention is to provide a caterpillar press type electroosmotic dewatering machine that can operate stably by correctly engaging the guide pin on the tension guide roller side with the guide hole provided on the filter cloth side. [Means for Solving the Problems] Among the above problems, this book has been developed as a means to solve the problems described above in order to properly engage the guide pins on the press belt side and the guide holes on the filter cloth side at the meeting point of the caterpillar press belt and the filter cloth. In the configuration of the invention, a correction roller is provided at least on the exit side of the tension guide roller to press against the filter cloth surface and squeeze the filter cloth in the left-right direction.

Here, the correction roller may be a pair of rollers arranged on both left and right sides of the filter cloth with the roller shaft inclined in a V-shape with respect to the circular movement direction of the filter cloth, or a pair of rollers arranged on the left and right sides of the roller circumferential surface. It can be configured as a spiral straightening roller with spiral protrusions with opposite lead angles. In addition, as a means of solving the problem of meshing the guide hole of the filter cloth stretched over the tension guide roller with the guide pin on the guide roller side, in the structure of the present invention, the tension guide roller is provided at both left and right ends from the roller shaft. A helt pulley with a large diameter is rotatably supported, and a guide pin is implanted on the circumferential surface of the helt pulley to engage with a guide hole drilled in the side helt of the filter cloth. [Function] The correction roller in the above configuration is pressed against the filter cloth,
It rotates following the circulating movement of the filter cloth, and at this time, the reaction force applied to the filter cloth from the correction roller acts to forcefully stretch the filter cloth surface, which has shrunk toward the center, in the left-right direction.

This allows the guide pins of the press belt example and the guide holes on the filter cloth side to mesh correctly when they overlap again with the caterpillar press belt on the downstream side.

In addition, in a configuration in which a belt pulley with a guide pin having a diameter larger than the roller shaft is rotatably supported at both ends of the tension guide roller, the filter cloth is placed between the left and right side belts between the large diameter guide pulleys. It will be strung across the bridge. On the other hand, since the central area of the filter cloth faces the guide roller, which has a smaller diameter than the belt pulley, in a slightly floating manner, a large tension is not directly applied to the central area of the filter cloth. As a result, almost no force is exerted to pull the filter cloth toward the center.
In addition, since the belt pulley is rotatably supported by the guide roller, the side belt of the filter cloth is not subjected to any restraining force in the direction of excessive movement of the rotating hand. As a result, troubles such as the guide hole drilled in the side helt coming off from the guide pin installed in the belt pulley while the filter cloth goes around the guide roller can be skillfully avoided.

〔Example〕

Example 1: Figure 1. FIG. 2 shows an embodiment corresponding to claim 1 of the present invention. First, in FIG. 1, a pair of correction rollers 18 are provided on both left and right sides of the filter cloth 3 so as to come into contact with the side helts 3a thereof. This correction roller 18 is arranged at least on the exit side of the filter cloth 3, preferably on the exit side and the entrance side with respect to the tension guide roller l2 shown in FIG.

In addition, as shown in FIG. 1, the straightening roller 18 has a shape that is tilted in opposite directions on the left and right sides so as to give an angle θ slightly larger than a right angle between the straightening roller 18 and the roller axis with respect to the circular movement direction P of the filter cloth 3. As shown in FIG. 2, the filter cloth 3
is pressed against the surface of the

With this configuration, when the filter cloth 3 moves around in the direction of the arrow P, the adjustment roller 18 receives a force F from the side helt 3a due to the frictional force acting between the filter cloth 3 and the roller surface of the correction roller 18, and rotates in a driven manner. ．． On the other hand, when the correction roller 18 rotates, a component force F corresponding to the above-mentioned roller axis angle θ is applied to the filter cloth 3. acts as a reaction force to push out the sight helmet 3a in the left-right direction. From this point on, the filter cloth 3 is forcibly handled so that the surface of the filter cloth is stretched in the left and right directions. Therefore, as described in FIG. 7, the vertical wrinkles (indicated by the symbol W in FIG. 1) generated in the center area of the filter cloth due to the tension applied to the filter cloth 3 are caused by the filter cloth 3 being removed by the correction roller 18. The filter cloth 3 is forcibly stretched by the squeezing force it receives when passing through the straightening roller 18, and after passing through the straightening roller 18, the filter cloth 3 exhibits a flat surface without vertical wrinkles. As a result, the apparent width of the filter cloth 3 returns to the predetermined dimension, and when the filter cloth 3 joins and overlaps the caterpillar press belt 2 again, the guide pin 2a on the press belt side and the gas 1 on the filter cloth helt side The holes 3a are aligned with each other, and the mesh 1' is properly engaged.

Embodiment 2: The third review shows an applied embodiment of the correction roller corresponding to claim 3. That is, /tFl mentioned in Example 1
Instead of the pair of diagonally arranged straightening rollers, in this embodiment a spiral straightening roller, indicated by the reference numeral 21, is arranged so as to come into contact with the filter cloth 3. This spiral correction roller 21 is
As shown in the figure, spiral protrusions 21a and 2lb having opposite lead angles are provided on the peripheral surfaces of both left and right regions with the center as a boundary.

When the filter cloth 3 moves around in this configuration, the helical correction roller 21 is driven to rotate in the direction of the arrow due to the frictional force, and the helical protrusions 21a, 2 are rotated by the reaction force of the correction roller 21.
The filter cloth 3 in contact with lb is forcibly squeezed so as to be stretched in the left-right direction in the same manner as described in Example 1. As a result, when the filter cloth 3 joins the caterpillar press belt again, the guide holes 3a of the filter cloth 3 are aligned with the guide pins of the press belt example.
Correct to a.

Embodiment 3: FIGS. 4 and 5 show an embodiment of a tension guide roller according to claim 4. That is, in FIG. 4, a belt-shaped tension guide roller 12 is rotatably supported on a shaft at both left and right ends of a rod-shaped tension guide roller 12 which is supported by a bearing 22. A guide pin l3 is installed on the circumferential surface of the belt pulley 230. Note that 24 is a retaining ring that restricts the movement of the belt pulley 23 from side to side. Here, the filter cloth 3 is bridged between the left and right hand belts 23 by engaging the guide holes 3b drilled in the left and right side belts 3a with the guide pins l3 on the hand belt side. Moreover, FIG. 5 shows the stretched state of the filter cloth 3 when FIG. 4 is viewed from the side. That is, caterpillar press belt 2
The filter cloth 3 that has been further separated is routed and stretched via the tension guide roller 12 and the auxiliary guide roller 14 on the downstream side so as to overlap the press helt 2 again.

Here, the side bell } 3a of the filter cloth 3 is placed over the belt bobbly 23 with a large diameter as shown by the solid line, and the central area of the filter cloth is placed with some slack relative to the guide roller with a small diameter as shown by the dotted line 3c. It is hung in a stretched state. In addition,
In the illustrated example, the auxiliary guide roller 14 is also the tension guide roller 1.
Like 2, it is equipped with hel rollers on both the left and right ends. With such a configuration, the center area of the filter cloth 3 is connected to the helt pulley 2.
Since the guide roller 12 has a smaller diameter than the filter cloth 3, the tension applied directly to the center area of the filter cloth 3 is very small.

Therefore, almost no force is exerted to pull the filter cloth 3 toward the center, and the belt bobbin 23 is moved toward the guide roller 1.
Since the filter cloth 3 is rotatably supported without being restrained by the roller shaft 20, the guide hole 3b drilled in the side heel 3a is implanted in the belt pulley 23 while the filter cloth 3 is rotating around the guide roller 12. Trouble such as coming off the guide pin l3 is reliably avoided. [Effects of the Invention] Since the present invention has the grooves as explained above, it has the following effects. In the claimed structure, a correction roller is provided at least on the exit side of the tension guide roller with respect to the filter cloth, so that a part of the peripheral area of the filter cloth is separated from the caterpillar press belt. In the patrol movement area,
The filter cloth surface, which has shrunk toward the center due to the tension applied from the guide roller side, can be corrected and the belt can be stretched flat before the filter cloth joins the caterpillar press belt again.
As a result, when the filter cloth overlaps the caterpillar press belt again, the guide holes on the filter cloth side and the guide pins of the press belt example are properly engaged and guided in a circular manner. Therefore, there is no possibility that the filter cloth will meander or come off the caterpillar press belt.

Here, if the straightening roller is configured as claimed in claims 2 and 3, the filter cloth can be skillfully straightened to be stretched from side to side with a simple roller mechanism.

In addition, in the structure of claim 4, a helt pulley having a diameter larger than the roller shaft is rotatably supported at both left and right ends of the tension guide roller, and a side helt of the filter cloth is mounted on the circumferential surface of the helt pulley. By installing guide pins that engage with the drilled guide holes, it is possible to reliably prevent circulation troubles such as the filter cloth coming off the guide pins and meandering inappropriately during the process of the filter cloth going around the guide roller, resulting in a stable filter cloth. Patrol movement can be secured.

[Brief explanation of drawings]

FIG. 1 is a plan view of the arrangement of the correction roller showing the configuration of an embodiment of the present invention, FIG. 2 is a partial side view of the correction roller in FIG. 1, and FIG. 3 is a plan view of the arrangement of the correction roller showing the second embodiment. figure,
Fig. 4 is a structural diagram of a tension guide roller showing Embodiment 3, Fig. 5 is a diagram of the tensioned state of the filter cloth seen from the side, and Fig. 6 is an outline of the structure of a conventional caterpillar press type electroosmotic dehydrator. FIG. 7 is a partially enlarged view showing the meshing state of the press helt and the filter cloth helt in FIG. 6. In the figure, ■ = rotating drum, 2: caterpillar presselt, 2a
: Guide pin, 3: a cloth, 3a: side helt, 3b:
guide hole, 12: tension guide roller, 13: guide pin, 15: sludge, 18: correction roller, 21: spiral correction roller, 21a. 2lb: Spiral process, 23: Hertbouli. P: Circulating movement direction of the filter cloth. Figure 1 3 Figure 2 W Figure 3 Figure 5

Claims (1)

[Scope of Claims] 1) A rotating drum and a caterpillar press belt arranged around the drum in a layered manner with an endless filter cloth are used as opposing electrodes to dehydrate sludge supplied into a passage between the opposing electrodes. This is a caterpillar press type electroosmotic dewatering machine that processes the filter cloth by engaging the guide pins installed on both the left and right sides of the caterpillar press belt with the guide holes drilled in the side belt on the filter cloth side. In a filter cloth that is stretched around a tension guide roller by separating a part of the peripheral area of the cloth from the caterpillar press belt, the filter cloth is straightened in the left and right direction by pressing against the filter cloth surface at least on the exit side of the tension guide roller. A caterpillar press type electroosmotic dehydrator characterized by the provision of rollers. 2) In the electroosmotic dehydrator according to claim 1, the straightening roller is a pair of rollers arranged on both left and right sides of the filter cloth with the roller shaft tilted in a V-shape with respect to the circular movement direction of the filter cloth. A caterpillar press type electroosmotic dewatering machine characterized by: 3) In the electroosmotic dewatering machine according to claim 1, the caterpillar wherein the correction roller is a spiral correction roller having spiral protrusions with opposite lead angles on the left and right regions of the roller circumferential surface. Press type electroosmotic dehydrator. 4) A caterpillar press type electric machine that uses a rotating drum and a caterpillar press belt arranged around the drum in an overlapping manner with an endless filter cloth as opposed electrodes, and dewaters the sludge supplied into the passage between the opposed electrodes. This is an osmotic dewatering machine, and the guide pins installed on both the left and right sides of the caterpillar press belt are engaged with the guide holes drilled in the side belt on the filter cloth side to connect the two, and a part of the peripheral area of the filter cloth is connected. is pulled away from a caterpillar press belt and the filter cloth is stretched over a tension guide roller with guide pins, and belt pulleys with a diameter larger than the roller shaft are rotatably supported at both left and right ends of the tension guide roller. A caterpillar press type electroosmotic dehydrator, characterized in that a guide pin that engages with a guide hole drilled in a side belt of a filter cloth is implanted on the circumferential surface of the belt pulley.