JPS6138788Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a filter cloth loosening prevention device for a belt press, which prevents loosening of the filter cloth by a transmission device disposed between the rollers of the belt press and transmitting the rotational force thereof.

Belt presses have traditionally been used as a means of dewatering sludge generated at sewage treatment plants, etc., but in this case, if the quality of the sludge is appropriate, the filter cloth may become loose during dewatering operation. However, in most cases it resolves naturally with a small amount. However, for example, if the sludge solidifies easily and is difficult to slip, or conversely if it is thick and slippery, a deviation exceeding the limit will occur between the upper and lower filter cloths, and this deviation will not be absorbed naturally. In this way, if the deviation exceeds the limit and the filter cloth becomes excessively slack, there is a risk that the filter cloth will meander or be damaged. It was necessary to remove the cable and re-hang it.

This invention solves the above-mentioned drawbacks by arranging a transmission device such as a belt or chain between the rollers to transmit rotational force.The rollers and the transmission device are connected via a clutch that can be brought into and out of contact with each other. It is an object of the present invention to provide a filter cloth loosening prevention device for a belt press that can effectively prevent loosening of the filter cloth by controlling the rotation of a roller using a rotational force different from the moving speed of the filter cloth.

An embodiment of this invention will be described below with reference to the drawings.

As shown in the main part configuration diagram in FIG. 1, sludge to be treated is sandwiched between upper and lower running endless filter cloths 2 and 3 wound around a large number of rollers (only some of which are shown in this embodiment) 1. and dehydrated during the meandering drive.

Then, any roller 1a, 1 of the rollers 1
A transmission device 7 consisting of a pulley 5 supported by a roller shaft 4 and a transmission belt 6 wound around the pulley 5 is provided at b. This transmission device 7
are normally kept separated and roller 1
Only the driving force from the filter cloths 2 and 3 acts between a and 1b.

Further, a clutch 8 is provided between the roller shaft 4 and the pulley 5, and the transmission device 7 and the rollers 1a, 1b are brought into contact with and separated from each other by the operation of the clutch 8. In this embodiment, the transmission device 7 is composed of a pulley 5 and a transmission belt 6, but the transmission device may be of any type, such as a sprocket or chain, as long as it can reliably transmit the rotational force between the rollers 1a and 1b. good. Furthermore, the transmission device may be provided between the driven rollers, or one of them may be a driving roller.

Furthermore, as shown in FIG.
At least one of the filter cloths has slack S exceeding a predetermined amount.
A photoelectric sensor (detection means) 9 is arranged to detect. As shown in FIG. 2, this photoelectric sensor 9 includes a photoelectric signal processing circuit 10 that outputs a normal or abnormal signal based on the detection output of the photoelectric sensor 9, and a photoelectric signal processing circuit 10 that forms and outputs a switching control signal based on this normal or abnormal signal. A control circuit 11 is sequentially connected to a switching circuit 12 which causes the clutch 8 to engage and disengage based on this switching control signal.

In the above embodiment, the clutch 8 is moved toward and away from the clutch 8 using electrical means such as a photoelectric sensor 9, but the present invention is not limited thereto and may be performed manually.

Here, the position where the filter cloth becomes slack varies depending on the overall structure of the belt press, particularly the position of the drive roller and the arrangement of the rollers. Therefore, it is a good idea to understand the locations where slack is likely to occur for each model through experimentation or the like. As shown in FIG. 1, a transmission device is provided between the rollers 1a and 1b at a location where slack is likely to occur. If the filter cloths 2, 3 move upward in this embodiment, the slack S is eliminated by reducing the amount of filter cloth fed out from the roller 1b. In this embodiment, the pulleys 5 and 6 and the rollers 1a and 1b have the same diameter, so even when the transmission device 7 causes the rollers 1a and 1b to rotate at the same time, the filters in contact with the respective rollers 1a and 1b remain in contact with the rollers 1a and 1b. The amount of cloth sent out will be the same. However, the slackened filter cloth 3 is wound around the roller 1b as an inner filter cloth and around the roller 1a as an outer filter cloth, so the distance from the roller rotation axis is It gets bigger when it's on. Therefore, the amount of filter cloth 3 fed out from roller 1b is smaller than the amount fed out from roller 1a, and the slack S is gradually eliminated. Note that when rollers having different roller diameters are connected by the transmission device 7, it is necessary to consider the roller diameter. Naturally, it is also possible to change the diameter of the pulley and provide a desired difference in rotational speed between the rollers. Furthermore, if the inner filter cloth becomes slack before the roller 1b, the rotation of the roller 1b may be made faster.

According to the above configuration, when the filter cloth slack S does not occur, the transmission device 7 is held in a free state with respect to the rollers 1a, 1b, and the transmission device 7 is held in a free state with respect to the rollers 1a, 1b.
Only the driving force generated by the filter cloths 2 and 3 is generated, and the sludge is dewatered while meandering.

However, when filter cloth slack S occurs in one of the filter cloths 2 and 3 and is detected by the photoelectric sensor 9, the clutch 8 is connected by signals from the photoelectric signal processing circuit 10, the control circuit 11, and the switching circuit 12, and the roller 1a, 1
Since a rotational force different from the moving speed of the filter cloth is generated between the two by the transmission device 7, the slack S of the filter cloth caused by excessive deviation between the upper and lower filter cloths is automatically corrected, and the operation can be continued as before. There is no need to stop or rehang the filter cloth.

As described above, according to this invention, a transmission device is provided between the rollers, and these are connected via a clutch, so the rotation of the rollers is controlled by the rotational force generated between the rollers, and the loosening of the filter cloth is effectively prevented. It has extremely excellent effects such as being able to prevent

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of an embodiment of this invention, and FIG. 2 is a block diagram of a detection means. 1, 1a, 1b... roller, 2, 3... filter cloth,
4...Roller shaft, 5...Pulley, 6...Transmission belt, 7...Transmission device, 8...Clutch, 9...Detection means.

Claims (1)

[Scope of utility model registration request] A pair of endless upper and lower filter cloths are wound around a number of rollers and dewater the sludge while holding the sludge in a meandering manner. A filter cloth loosening prevention device for a belt press, comprising a transmission device that rotationally controls the roller using power to prevent the filter cloth from loosening.