JPS6328415A - Automatic discharge type filter for solid material - Google Patents

Abstract

PURPOSE:To contrive the stable filtration and to efficiently scrape a filtered layer formed on the outer circumference of a screen drum by means of both a scraping member and a bottom cover capable of opening and closing at a time finishing filtration and also to discharge it at a stroke to the outside by making the thickness of the above-mentioned filtered layer definite at a time of filtration. CONSTITUTION:Both a scraping member 5 normally and reversely rotated on the outer circumference of a screen drum 2 and an adjusting member 6 for the thickness of a filtered layer are provided to the inside of a filter tank 1. The thickness of the filtered layer is increased by performing filtration but it is maintained at the prescribed thickness by the scraping operation of the above-mentioned adjusting member 6. Further at a time finishing filtration, the filtered layer is efficiently scraped by the scraping member 5 and removed from the surface of the drum 2. Furthermore the filtered layer removed from the surface of drum 2 is collected on a bottom cover 16 but it is discharged at a stroke to the outside by opening the bottom cover 16.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention forms a filter aid layer, a cake layer, or a solid particle layer (hereinafter referred to as a filtration layer) on the outer periphery of a screen drum, and this filtration layer allows the undiluted solution to be filtered. The present invention relates to a filtration device that separates solid particles and filtrate (clarified liquid).

(Prior art and its problems) In conventional filtration devices, solid particles accumulate on the filtration layer over time, which increases filtration resistance and reduces filtration speed. To prevent this filtration rate from decreasing,
The filtration pressure is monitored and the screen drum surface is maintained as necessary. Maintenance of the screen drum surface is as follows:
The filtration layer is removed by washing it off with water or by shaking it off, but there is a problem that the efficiency of this process is low.

In addition, when switching from filtration of one stock solution to filtration of another stock solution, or when cleaning the screen drum surface during filtration, the removed filter aid, cake, or solid particles should be discharged to the outside at the bottom of the filtration device. Since the water is discharged to the outside through a drain pipe installed in the drain pipe, there are problems in that it takes a long time to drain the water and it is difficult to drain it completely.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a vertical screen drum inside a vertical filtration tank with an open bottom, and a screen drum that is deposited on the outer periphery of the screen drum. A support frame is provided with a member for adjusting the thickness of the filtration layer consisting of a filter aid layer, a cake layer or a solid particle layer to a constant value, and a member for scraping off the filtration layer deposited on the outer periphery of the screen drum at the end of filtration. , the screen drum and the support frame are made relatively rotatable, and the thickness of the filtration layer is made constant by forward rotation, and the filtration layer is scraped by reverse rotation, while the bottom opening of the filtration layer is It is characterized by a bottom cover that can be opened and closed.

(Function) According to the above configuration, during filtration, the thickness of the filtration layer formed on the outer periphery of the screen drum becomes constant, an increase in filtration resistance can be prevented, and stable filtration can be achieved. Further, at the end of filtration, the filter layer adhering to the screen drum is efficiently scraped off by a scraping member and removed from the screen drum surface.

Further, the filtration layer removed from the screen drum surface accumulates on the bottom lid of the filtration device, but can be discharged to the outside at once by opening the bottom lid. Moreover, the bottom of the filter tank is
It can be opened by opening the bottom cover, making it easy to clean the inside of the case. Furthermore, since the bottom cover is attached to the bottom of the filtration tank, it is easy to open and close the bottom cover, and it is suitable for automating the closing operation.

(Embodiment) In the illustrated embodiment, a vertical screen drum 2 is fixedly disposed in a vertical filtration tank 1 with an open bottom. The screen drum 2 is optimally made of multilayer gold W4 (with a mesh opening of 5 μm).

), wedge wire, punching plate, and other filter media 3
The filter layer 4 is deposited on the surface thereof. When forming the filtration layer 4, a body feed method in which a small amount of filtration aid is added to the stock solution, a precoat method in which a liquid in which only the filtration aid is dispersed is filtered to form a layer containing only the filtration aid prior to filtration, or This is carried out by using a combination of body feed method and precoat method, or by a filter media filtration method in which a layer of fixed particles is directly formed on the surface of the filter media without using a filter aid.
In this embodiment, either method may be adopted.

Inside the filtration tank 1, a scraping member 5 and a filtration layer thickness adjusting member 6, which rotate forward and backward around the outer periphery of the screen drum 2, are arranged, and these are attached to a support frame 8 which is rotated forward and backward by a motor 7. It is being

The scraping member 5 is composed of a knife plate rotatably attached to the support column 8a of the support frame 8, and the tip 9 of the knife is disposed so as to be in close contact with the surface of the screen drum 2.

Further, as shown in FIG. 3, the rotation of this scraping member 5 is restricted by a stopper 10.

The filter layer thickness adjusting member 6 is composed of a knife plate attached to the support column 8b of the support frame 8 so that the attachment angle can be adjusted, and the distance between the knife tip 11 and the surface of the screen drum 2 can be adjusted. ing. 1 in Figure 3
2.12 is a screw for fixing the adjustment member 6 at a predetermined mounting angle position.

The scraping member 5 and the adjusting member 6 are set so that the respective knife tips 9 and 11 face in the direction shown in FIG. operate

Raw solutions such as paints, silicone liquids, beverage raw material liquids, and chemical liquids are applied with a predetermined pressure from the inlet 13 of the filtration tank 1 and flow into the interior, and after being filtered by the filtration layer 4 formed on the surface of the screen drum 2. The filtrate flows out from the lower part of the screen drum 2 through the outflow pipe 14 to the outside as a filtrate. Solid particles in the stock solution adhere to and accumulate on the filter layer 4, increasing the thickness of the filter layer 4, but as shown in FIGS. 4 (A1) and (A2), the motor 7 is rotated in the forward direction. Then, the filtration layer 4 is removed by the scooping operation by rotating the adjustment member 6 in the same direction.
The thickness is maintained at a predetermined thickness. As a result, an increase in filtration resistance due to the accumulation of solid particles can be prevented, and the filtration rate can be stabilized.

When the filtration work is completed and the filtration layer 4 is removed and the screen drum 2 is regenerated and cleaned, the process shown in FIG. 4 (B1) is performed.
, (B2), when the motor 7 is rotated in the opposite direction and the scraping member 5 is rotated in the same direction, the knife tip 9 bites into the filter layer 4, and the filter layer 4 is removed from the screen drum 2. can be removed from the surface.

The bottom open part of the filter tank 1 has a pivot 1 attached to the bottom of the filter tank 1.
It can be opened and closed by means of a bottom cover 16 attached using a screwdriver 5, and is normally closed. This bottom cover 16 is opened and closed by the expansion and contraction movement of a cylinder 17 of hydraulic pressure, air, etc., and when opened, it becomes as shown by the imaginary line in FIG. 1. Further, the bottom cover 16 is locked by a locking outer ring 18. This outer lock ring 18 may preferably have a known structure that releases its engagement with the bottom i16 when it is rotated by a predetermined angle. Also, the bottom 1i
The outflow pipe 14 is attached to the drain pipe 16, and a drain pipe 19 is also attached thereto.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, it is possible to configure the screen drum 2 to be rotatable while the support frame 8 is configured to be in a fixed state. Alternatively, the bottom cover 16 attached to the bottom of the filtration tank 1 may be configured to be opened and closed manually.

(Effects of the Invention) Since the present invention has the above configuration and function, the thickness of the filtration layer can be kept constant and a stable filtration rate can be obtained.

In addition, when switching from filtration of one stock solution to filtration of another stock solution, the filtration layer formed on the outer periphery of the screen drum can be reliably removed in a short time by a scraping member, and the removed filtration layer (filtration aid) can be removed reliably in a short time. agent, cake or fixed particles)
This has the effect that the liquid can be reliably discharged to the outside in a short period of time, and that internal cleaning is also facilitated.

If a multilayer wire mesh with a mesh opening of 5 μm is used as the filter medium of the screen drum, the filter medium will not open, allowing precision filtration and widening the range of application.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional side view showing an embodiment of the present invention, Fig. 2 is a schematic plan view showing the principle of the transverse plane, Fig. 3 is a perspective view of the main part, and Fig. 4 is a scraping member and It is a schematic plan view explaining the effect|action of a filter layer thickness adjustment member. １・−・・−−−−１−−−・・−・−・・−−−−
・−・・−Filtration tank 2−・・・・−・・・−・−・−・
−・−・−−−11−Screen drum 4−・−−−m
=−・−・−・−・−・−1−−−・−・・−・・Filtration layer 5 −・・・・−・・・−・−・−・−・−・−・−Scraping member 6・−・−・−・−・・−・−−−１−・−・−
−−−～・−・−Filtration layer thickness adjustment member 8・−11−−−
−−−−−−−−−・−・−・−−1−−−・−Support frame 16・−−−−−−・−・−・−・−・−・−Bottom cover 4th figure

Claims (2)

[Claims] (1) A vertical screen drum is arranged inside a vertical filtration tank with an open bottom, and a filtration layer consisting of a filter aid layer, a cake layer, or a solid particle layer is deposited on the outer periphery of the screen drum. A support frame is provided with a member for adjusting the thickness to a constant level and a member for scraping off the filter layer accumulated on the outer periphery of the screen drum at the end of filtration, and the screen drum and support frame can be rotated relative to each other. The solid material automatic is characterized in that the thickness of the filtration layer is kept constant and the filtration layer is scraped off by reverse rotation, and a bottom cover that can be opened and closed is attached to the bottom opening of the filtration layer. Discharge type filtration device. (2) The solid matter automatic discharge type filtration device according to claim 1, which uses a multilayer wire mesh with a mesh opening of 5 μm as a filter medium of the screen drum.