JPS60255123A - Expression type filter press - Google Patents

Abstract

PURPOSE:To prevent the excess swell of a filter cloth and a flexible plate of expression filter plate side by forming plural pieces of protuberances which are protruded in the direction of thickness of the filter plate in the radiate arrangement of the hole for raw liquid. CONSTITUTION:In the side surface around either hole 8 for raw liquid of expression filter plates 4 or normal filter plates 7, plural pieces of protruberances 9, 9 which are protruded in the direction of thickness of the filter plates are formed in the radiate arrangement of the holes 8 for raw liquid. All the surfaces of both sides are covered with the filter cloths 12, 12 from the inside peripheral parts of the holes of the expression filter plates 4 and the normal filter plates 7 and the sides around the holes 8 of both filter plates are approximated in the abovementioned protuberances 9, 9. When the pressurized fluid is fed to the expression filer plates 4, the swell of flexible plates 3 is suppressed by means of existence of the protuberances 9, 9 around the holes 8 and swelled practically parallel to the filter surfaces and the raw liquid incorporated in the filter chambers 15 is almost uniformly compressed towards the normal filter plates 7 side to perform the dehydration.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a squeeze-type filter press for dehydrating a stock solution by compressing and filtering the stock solution.

Prior Art and its Problems In general, in compression filtration of stock solutions using a compression filter press, the filtration efficiency and processing capacity vary significantly depending on the magnitude, balance, or imbalance of the compression pressure. On the other hand, in a filter press that alternates pressing furnace plates and ordinary door plates formed by a rigid frame-shaped main body and a flexible material that swells with compressed air, the above-mentioned flexible material is used as an undiluted solution. An abnormal bulge occurs near the pores, causing damage, or
Alternatively, there is a problem that the next supply of the stock solution becomes unsmooth. For this reason, for example, a reinforcing ring is fitted into the solution hole of the flexible member to prevent the flexible member from bulging toward the solution hole. However, in this case, a phenomenon occurs in which the flexible material is suddenly bent and bulged from the edge of the reinforcing ring.
The tightening of the reinforcing ring has the disadvantage that it is likely to be damaged from the edge portions. In order to improve this inconvenience, an auxiliary ring is provided in the liquid solution hole of the ordinary door plate installed oppositely, as shown in Japanese Patent Publication No. 58-35727. Devices have been provided that are designed to reduce bulge.

However, in such a device, although it is possible to limit the rapid curved expansion of the flexible material, the phenomenon that the flexible material bulges out in a spindle shape from the outer periphery of the reinforcing ring is unavoidable, and it is still insufficient in terms of durability. It is not completely satisfactory, and there are some difficulties in balancing the squeezing pressure with respect to the raw solution.Furthermore, the edge of the reinforcing ring protrudes outward from the furnace cloth surface, so that one part of the cake after squeezing is Even if the oven cloth is vibrated to remove the cake that has accumulated on the boundary step between the reinforcing ring and the oven cloth and adhered to the oven cloth surface of each door plate, the vibration will cause the cake to fall off the boundary between the reinforcing ring and the oven cloth. has the disadvantage of being difficult to transmit.

Purpose of the Invention The present invention was made with the aim of improving the above-mentioned difficulties and drawbacks of the conventional compression type filter press. At the same time, when the squeezing pressure is applied, the flexible plate and furnace cloth can bulge out substantially parallel to the filtering surface of the press plate, and a cake can be formed at the boundary step between the reinforcing ring and the flexible plate. To provide a squeezing type filter press in which there is no accumulation of cake, and in addition, vibration for removing the cake can be applied uniformly to the entire surface of the p-cloth.

Composition of the Invention The compression type filter press according to the present invention includes a compression door plate having a flexible plate provided with a filtration surface having a thickness smaller than that of the frame on the inner side of a rigid frame-like frame; In a compression type filter press that is made up of alternating ordinary furnace plates with filtration surfaces that are thinner than the frame, the concentrate is placed on the side of the liquid solution hole in either the compression furnace plate or the ordinary door plate. A plurality of raised portions protruding in the thickness direction of the door plate are formed in the radial arrangement of the holes, and both sides of the pressed door plate and the normal door plate are covered from the inner periphery with furnace cloth, and the undiluted solution hole in the other door plate is covered with furnace cloth. The surrounding side surfaces are brought close to each other at the raised portion.

EXAMPLE Below, to explain specifically about FIGS. 1 and 2 showing examples of the present invention, the frame body is provided with a rectangular or circular frame-like frame L made of metal or hard plastic, etc. The frame l is formed of a rubber material on the inner part of the frame l.
A squeeze door plate 4 is provided with a flexible plate 3 having a filtration surface 2 that is thinner than the filtration surface 2, and a filtration surface 6 that is entirely made of metal or hard plastic and that is thinner than the outer frame portion 5. In the compression type filter press, a large number of ordinary door plates 7 with A plurality of raised portions 9.9 protruding in the thickness direction of the compressor plate 7 are formed so that the top flat surface 10.10 thereof approaches the side surface around the raw solution hole 8 of the adjacent compression furnace plate 4. A raw solution inlet groove 11, 11 is formed between the raised portions 9, 9, and the entire surfaces of the pressing furnace plate 4 and the ordinary furnace plate 7 from the inner peripheral surface to both sides are covered with F cloths 12, 12.

In the figure, 12' and 12' are joints along the inner periphery of the raw solution hole in the furnace cloth.

In this embodiment, the above-mentioned pressing furnace plate 4 is a rigid core plate 1.
When pressure fluid is introduced from the pressure fluid introduction port 14, the thin walled portions on both sides bulge outward. It is designed to perform a squeezing action on the stock solution. The inner part 16 of the stock solution hole 8 of the flexible plate 3 is thick and has a U-shaped cross section. Although a reinforcing ring 17 is shown fitted, the structure of this pressing furnace plate 4 is not particularly limited. In the figure, reference numeral 18 denotes an off-shore permeate discharge port that communicates with filtrate guide grooves (not shown) formed on the filter surfaces 2 and 6 of the door plate 4.7.

FIG. 3 shows an embodiment in which the raised portions 9, 9 of the above-mentioned ordinary door plate 7 are formed separately and fixed to the furnace plate 7 with set screws 19, 19. According to this configuration, by preparing the raised portions 9, 9 having different heights and sizes,
It is possible to form a filter press adapted to the quality and concentration of the stock solution, and by removing the raised portions 9, 9, effects such as being able to be used as a normal door plate can be obtained.

In the embodiment described above, the raised portions 9, 9 are provided on the normal door plate 7, but the raised portions 9, 9 may be provided on the pressed door plate 4. FIG. 5 shows this aspect. That is, the raised portions 9,
9, the entire surfaces of both oven plates 4, 7 are covered with oven cloths 12, 12, and the top flat surfaces 20, 20 of the raised portions 9, 9 are attached to the side surface surrounding the stock solution hole of the adjacent ordinary door plate 7. They are in close proximity.

The shape of the raised portions 9, 9 formed on the side surface of the door plate 7 or the side surface around the raw solution hole of the pressing furnace plate 4 does not need to be specified; It is preferable to use a trapezoidal shape 9 with a surface, and when four to six raised portions 9, 9 are provided at equal intervals, the raised portions 9, 9 located on the lower half circumference side of the door plate as shown in FIG. It is convenient for the cake to be discharged if the size of the flat surface 20° 20 is made slightly smaller.

Effects of the Invention As described above, the squeezing filter press according to the present invention has a rigid frame-like frame 1 with a filtering surface 2 having a smaller thickness than that of the frame 1 on the inner side thereof, and nine flexible plates 3. Compressing furnace plate 4
and ordinary furnace plates 7 each having a filtration surface 6 having a smaller thickness than the frame portion 5 on the outer periphery are arranged alternately. A plurality of ridges protruding in the thickness direction of the oven plate are arranged radially on one side of one stock solution hole 8.
10- Form part 9.9, cover the entire surface of both side surfaces from the inner periphery of the liquid solution hole of the press door plate 4 and ordinary furnace plate 7 with ν cloth 12.12, and cover the area around the liquid solution hole 8 of the shutter plate. The side surface is the raised part 9
, 9, so the pressure n
When pressurized fluid is supplied to the F plate 4, the flexible plate 3 moves to a raised portion 9 around the stock solution hole 8, as shown by the broken line in FIG.
. It can perform dehydration action. The furnace cloth 12 is covered from the inner circumferential surface of the liquid hole to the metal surface of the metal plate in the Tanto board 4 and the ordinary board 7, and is not firmly fixed by the edge of the ring as in the conventional case. The service life of the P cloth 12 can be greatly extended since no excessive local tension is applied to the P cloth 12.

Furthermore, the vibration applied to the furnace cloth 11 when peeling off the remaining cake after dehydration spreads to the entire furnace cloth, and the deposits on the cloth surface can be efficiently removed.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, and FIGS. 1 and 2 are a partially omitted cross-sectional view showing an embodiment in which a raised portion is provided on a normal P plate, and a partially broken pressure surface view of the stock solution hole portion. , Fig. 3 and Fig. 4 are a partially omitted sectional view and a partially broken pressure surface view showing another embodiment, and Figs. 5 and 6 show an embodiment in which a raised portion is provided on the compressed p plate. They are a partially omitted sectional view and a partially broken pressure surface view. DESCRIPTION OF SYMBOLS 1... Frame body, 2... Ripple surface, 3... Flexible plate, 4...
... Pressing ν plate, 5 ... Frame part, 6 ... Filtration surface, 7.
・・Normal F plate, 8・Solution hole, 9・Raised part, 1
2... Rofu Applicant Kurita Machinery Co., Ltd. Agent Goho - Keiji Figure 1 Figure 2 Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A pressing door plate comprising a flexible plate forming a filtration surface with a thickness smaller than that of the frame inside a rigid frame-like frame; In a compression type filter press consisting of ordinary door plates and ordinary door plates each having a small filtration surface arranged alternately, the thickness of the door plate is set on the side of the stock solution holes of either the press furnace plate or the ordinary door plate, in accordance with the radial arrangement of the stock solution holes. A plurality of raised parts projecting in the horizontal direction are formed, and the entire surface of both sides from the inner periphery of the raw solution hole of the pressing furnace plate and the ordinary furnace plate is covered with P cloth, and the area around the raw solution hole of the other door plate is covered with P cloth. A 1-set filter press for pressing, characterized in that the side surface is located close to the raised portion.