JPH10211402A - Method for pushing filter plate of filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dehydrating efficiency by reducing loss time in dehydration by a method wherein an air cylinder is used for motive power which slides in no loading time a movable plate pushing a filter plate being under a separated state, and besides, in a pressurizing stage, the filter plate is pressurized by extension of a hydraulic flat jack. SOLUTION: In a filter press wherein a plurality of filter plates 3 and a movable plate 4 are placed bridging over a pair of left and right fixed frames 1, 1', a main air cylinder 5 is provided to an opposed side of a filter plate direction of the movable plate 4. Then, the movable plate 4 is advanced, and then, a support rod 6 is bridged over a ram of the main air cylinder 5. The support rod 6, when it is made horizontal with an auxiliary air cylinder 7, makes the support rod 6 abut against a ram head 8 of the main air cylinder 5, and a load of the movable plate 4 is supported with the support rod 6. A hydraulic flat jack 9 is built in the movable plate 4, the movable plate 4 is pushed with pressurizing oil supplied from a compact hydraulic pump 10, and a slurry pump 10 is started under this state to start dehydration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pressing a filter plate of a filter press used for treating wastewater in a relatively small-scale ready-mixed plant.

[0002]

2. Description of the Related Art In a filter press dehydrator in which a side plate is fixed on both sides along a filter plate and slides on the side plate, and a filter press dehydrator loaded with a movable plate, the movable plate is directly connected to a hydraulic cylinder. A pair of rings that press the filter plate, or a pair of rings that contact the movable plate and bend at the center, and press the bent portion with a hydraulic cylinder or an air cylinder, the pair of rings are linear. There is a method in which a movable plate is pressed and moved forward by taking a shape.

[0003]

The hydraulic cylinder of the conventional method requires a long stroke, so that the hydraulic pump also needs to be large and the equipment cost is high. Therefore, as a dehydrator for small-scale ready-mixed concrete factories, we provide a low-priced dehydrator by improving the weighting of hydraulic equipment, which is the power equipment of the dehydrator, by incorporating a low-priced air cylinder. What you want to do.

[0004]

The load applied to the movable plate for pressing the filter plate of the filter press is a method that pays attention to the fact that the non-loaded portion is mostly and the pressurized portion is very small. The main feature is that, even if the power of the movable plate in the no-load portion is low, an air cylinder with a high moving speed is used and a hydraulic ram is incorporated in the pressurized portion even if the capacity is low. An air cylinder is used as the power to slide the movable plate that presses the filter plate in the separated state when there is no load, and when the no-load press is completed and the pressurization stage is started, first, the air cylinder is wrapped. The downward U-shaped groove support rod is fitted between the cylinder head flange and the fixing plate. Thereby, the hydraulic flat jack built in the rear part of the movable plate comes into contact with the cylinder head flange. The flat jack is connected by a small hydraulic pump to operate the flat jack, and the filter plate is pressurized by extension of the hydraulic flat jack.

[0005]

[Function] Before the dewatering process of the filter press, the movable plate moves forward and comes into contact with the filter plate, that is, the main air cylinder is used in a portion where a strong pressing force is not required, so that it can be quickly operated. The movable plate moves forward. Next, in the pressing step, when a strong pressing force is required for the movable plate, the movable plate is supported by a support rod to prevent retreat. The support rod can be inverted by an auxiliary air cylinder. The movable plate gives a pressing force after it is supported by the support rod. This pressing portion has a distance in the range of about ten and several millimeters and does not require high speed, but because it requires high pressure, a hydraulic pump is used to operate a hydraulic flat jack built in the movable plate. Press. When pressurization of the filter plate is completed, a dehydration step is started, and the slurry pump 11 is started to start dehydration. The pressure applied to the filter plate can always be determined and maintained by a pressure gauge attached to the hydraulic flat jack.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a filter press and a pressurized state of an embodiment of the present invention, FIG. 2 is a front view of a state in which dehydration is completed and a support rod for retracting a movable plate is released, and FIG. FIG. 3 shows a front view of a state in which each filter plate is fully opened after being reduced.
A pair of left and right fixed frames 1, 1 'on both sides, side plates 2, 2'
Is fixed, and a plurality of filter plates 3 and a movable plate 4 are mounted between fixed frames. In the filter press, first, as a pressing means at the time of no load, A main air cylinder key 5 is provided, the movable plate is advanced, and then a support rod 6 which rises and falls in a horizontal and vertical state is passed over the ram of the main air cylinder.
When the support air cylinder 7 is leveled by the auxiliary air cylinder 7, the support rod 6 is attached to the ram head 8 of the main air cylinder.
The load on the movable plate deviates from the main air cylinder and is supported by the support rod by the contact of the support plate. The movable plate 4 incorporates a hydraulic flat jack 9 so that the movable plate 4 is pressed by a small hydraulic pump.

[0007]

[Effect] Conventionally, the movable plate is pressed by the hydraulic cylinder including the unloaded state, and the portion requiring high pressure by hydraulic pressure is in the range of 10 mm to 20 mm.
By using a flat jack, a very small hydraulic pump can be used, so that the price was significantly lower than that of a conventional hydraulic device. Also, since the hydraulic part is small and the no-load part is an air cylinder, the loss time in dehydration is reduced, and the dehydration efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a pressurized state of an embodiment of the present invention.

FIG. 2 is a front view of a state in which a support rod for retracting a movable plate is released.

FIG. 3 is a front view of the filter plate in a fully opened state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed frame 1 'Fixed frame 2 Side plate 2' side plate 3 Filter plate 4 Movable plate 5 Main air cylinder 6 Support rod 7 Auxiliary air cylinder 8 Ram head 9 Hydraulic flat jack 10 Small hydraulic pump 11 Slurry pump

Claims (1)

[Claims] A movable plate for pressing a filter plate in a filter press having a pair of parallel side plates fixed between left and right frames and a plurality of filter plates slidably mounted on the side plates. A method of pressing a filter plate of a filter press, characterized in that an air cylinder is used as a power to slide when no load is applied, and a supporting means is provided to prevent the movable plate from retreating when a load is applied, and the plate is pressed with a hydraulic flat jack.