JPS6238006B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a squeezing type filter press for dewatering a stock solution by squeezing it.

Prior Art and its Problems In general, when squeezing a stock solution in a squeezing type filter press, the overefficiency and throughput greatly differ depending on the magnitude of the squeezing pressure, or whether it is balanced or unbalanced. On the other hand, in a filter press which is made up of alternating pressing plates and ordinary plates formed by a rigid frame-shaped main body and a flexible material that expands when compressed air is applied, the flexible material is There is a problem in that an abnormal bulge occurs around the stock solution hole when the liquid bulges out. 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, the flexible material suddenly bends and bulges from the edge of the reinforcing ring, resulting in the inconvenience of being easily damaged from the portion located at the tightening edge of the reinforcing ring. are doing. In order to improve this inconvenience, for example, as seen in Japanese Patent Publication No. 58-35727, an auxiliary ring is provided in the solution hole of the opposed plain plate, and the outer periphery of the auxiliary ring allows the flexible material to be Devices have been provided that are designed to suppress excessive bulge.
However, in such a device, although it is possible to limit the rapid curved expansion of the flexible material, the phenomenon of the flexible material expanding into 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 stock solution. Furthermore, since the edge of the reinforcing ring protrudes outward from the fabric surface, some of the cake after squeezing accumulates on the boundary step between the reinforcing ring and the fabric, causing the cake adhering to the fabric surface of each plate to be removed. Even if the cloth is vibrated to make it fall off, the vibration is difficult to be transmitted to the boundary between the reinforcing ring and the cloth.

Purpose of the Invention The present invention has been made with the aim of improving the above-mentioned difficulties and drawbacks of the conventional compression type filter press. When compressed pressure is applied, the flexible plate and the cloth can bulge out substantially parallel to the surface of the compressed plate, and no cake is deposited on the boundary step between the reinforcing ring and the flexible plate. In addition, the present invention provides a compression type filter press that can uniformly apply vibration to the entire surface of the cloth to remove the cake.

Composition of the Invention The compressing type filter press according to the present invention includes a compressing plate formed by providing a flexible plate having a circumferential surface with a thickness smaller than that of the frame on the inner side of a rigid frame-like frame; In a compressing type filter press consisting of alternating plates with regular plates having oversurfaces that are thinner than the frame, the liquid hole in the flexible plate of the compressing plate has a thickness similar to that of the frame. A ring member having a V-shaped or U-shaped cross-section on the inner periphery is fitted, or a ring-shaped part similar to the above-mentioned ring member is fitted around the stock solution hole of the flexible plate itself. forming a thick ring-shaped part on the circumferential part of the pressing plate, and covering the cloth from the inner peripheral surface of the ring-shaped part along the surface of the flexible plate to constitute the pressing plate, A plurality of raised portions having a substantially trapezoidal cross-sectional shape that protrude in the thickness direction of the plate to the same extent as the frame of the plate are formed radially around the stock solution hole of the ordinary plate, A regular plate is constructed by covering the inner circumferential surface of the stock solution hole with cloth along the surface of the diaphragm.

Further, the diameter of the circular outer periphery centered on the stock solution hole of the raised portion of the ordinary plate is configured to be slightly larger than the outer diameter of the ring-shaped portion of the pressing plate.

Embodiments Hereinafter, embodiments of the present invention will be described in more detail based on drawings showing embodiments of the present invention. A compression plate 4, which is made of a rubber material and has a flexible plate 3 having a thickness smaller than the thickness of the frame body 1 and has oversurfaces 2 on both sides, is fitted and held in the part, and a compression plate 4 made of metal or hard plastic as a whole. 1 to 3 show the main parts of a compressing type filter press which is made up of alternating plates 7 and 7 having an oversurface 6 that is thinner than the outer frame 5. As shown in FIG. A ring-shaped member 9 with a gently tapered V-shaped or U-shaped cross-sectional shape on the inner periphery serving as the stock solution hole 8 is fitted onto the inner periphery of the plate 4. A flange portion 10 is formed, a cloth 11 is covered from the surface of the frame-like frame 1 to the surface of the flexible plate 3 to constitute the pressing plate 4, and the stock solution hole 8' of the ordinary plate 7 is formed.
around the plate 7, protruding in the thickness direction of the plate 7 to a thickness equal to or slightly smaller than the thickness of the frame portion 5 of the plate 7,
A plurality of raised portions 14 each having a generally trapezoidal cross section and having a gentle slope 12 and a flat top 13 are formed at intervals in the circumferential direction of the stock solution hole 8'.
A cloth 11' is covered from the inner circumferential surface of the filter press along the upper surface 6 to form a regular plate 7, and a large number of such press plates 4 and regular plates 7 are arranged alternately to form a filter press.

The ring-shaped member 9 forming the stock solution hole 8 of the above-mentioned pressing plate 4 has two parts in its diameter and axial direction.
Although the figure shows an embodiment in which the parts are divided and integrated using the set screw 15, it goes without saying that a ring member having a groove on the outer periphery into which the inner periphery of the flexible plate 3 can be fitted may also be used. It is. Moreover, the ring-shaped member 9
The thickness of both plates 9 and 14 should be determined so that a slight gap S is formed between the side surface of the plate 7 and the flat top portion 13 of the radially arranged raised portions 14 of the ordinary plate 7 when the plates are pressed together. It is desirable that the outer diameter of the top portion 13 of the raised portion 14 around the stock solution hole 8' be slightly larger than the annular outer diameter of the ring-shaped member 9. 16 in the diagram
1 is a pressure fluid introduction pipe; 17 is an excess liquid discharge passage; 1
Reference numerals 8 and 18' indicate liquid guide grooves provided on the surface of the flexible plate 3 and the surface of the ordinary plate 7, which communicate with the discharge passage 17, and 19 indicate the above-mentioned raised portions 14 and 1.
Most of the stock solution fed into the stock solution hole 8 passes through this groove part 19 into the chamber 2.
0. It goes without saying that the shape and arrangement of the liquid guiding grooves 18, 18' are arbitrary.

FIG. 4 shows another embodiment of the pressing plate 4.

In the pressing plate 4, which includes a rigid plate 21 that is integrally formed with the frame 1 and extends inward, and flexible plates 3 are arranged on both sides of the frame 1 and the rigid plate 21, the stock solution hole of the rigid plate 21 is The inner peripheral end of the flexible plate 3 is wrapped by the inner peripheral part of the flexible plate 3, and the inner peripheral part of the flexible plate 3 has a V-shaped or U-shaped cross section having a thickness corresponding to the ring member 9 described above. A thick ring-shaped part 9' is formed by the flexible plate 3 itself, and both sides of the flexible plate 3 are covered with cloth 11 from the surface of the ring-shaped part 9'.
This shows an embodiment in which the pressing plate 4 is constructed by covering with. Further, the cloths 11 and 11' may be stretched in contact with the upper surfaces 2 and 6 of the pressing plate 4 and the ordinary plate 7, respectively, but as shown in FIG.
It is preferable that the ring-shaped portion 9 and the raised portion 14 be in contact with the surfaces of the ring-shaped portion 9 and the raised portion 14, and that the upper surfaces 2 and 6 be covered with a slight gap S1 between the upper surfaces 2 and ₆ . In case 4, the expansion of the flexible plate 3 provides freedom, and in case of ordinary plate 7, it helps the cloth to fit along the excess water guiding groove 18 without any force, and furthermore, vibration is applied to the cloth 11 to separate the cake. In this case, there is an advantage that the vibration is effectively transmitted to the surface of the ring-shaped portion 9.

Note that the top surface 13 of the raised portion 14 of the ordinary board 7
Although the figure shows an aspect in which the top surface is horizontally elongated in the circumferential direction, the top surface may be elongated in the circumferential direction.
In any case, the top surface of this raised portion 14 is the slope 1
2 and 12, so that the cloth 11 is not damaged.

Effects of the Invention As described in detail in the above embodiments, the filter press according to the present invention has a flexible frame 1 which has a rigid frame-like frame 1 and an oversurface 2 having a thickness smaller than that of the frame 1 on the inner side thereof. A pressing plate 4 provided with a plate 3;
In a compression type filter press in which ordinary plates 7 each having an oversurface 6 having a thickness smaller than that of the outer frame portion 5 are arranged alternately, the flexible plate 2 of the compression plate 4 and around the stock solution hole 8 are used. , by fitting a ring member 9 having a thickness similar to that of the frame 1 and having a V-shaped or U-shaped cross-section at the inner circumference, or by inserting a hole in the flexible plate 3 itself into the liquid solution hole. A ring-shaped part 9' having the same shape as the ring member 9 is formed around the ring member 9, and a cloth 11 is coated from the inner peripheral surface of the ring-shaped part 9' along the surface of the flexible plate 3 to form the pressing plate 4. Around the stock solution hole 8 of the ordinary plate 7, a raised portion 14 having a substantially trapezoidal cross section that protrudes in the thickness direction of the board 7 to the same extent as the frame 5 of the board 7 is provided. A plurality of plates are formed radially around the periphery, and a cloth 11 is coated from the inner peripheral surface along the outer surface 6 to constitute the ordinary plate 7,
Since the pressing plates 4 and the ordinary plates 7 are arranged alternately, when pressure fluid is supplied to the pressing plates 4, the surface 2 of the flexible plate 3 is filled with undiluted liquid as shown by the broken line in FIG. By suppressing the bulge on the hole 8 side, the bulge is bulged out substantially parallel to both sides,
The slag in the chamber 20 can be compressed almost evenly toward the ordinary plate 7, and effective dewatering can be accomplished. Moreover, the cloth 11 is covered from the inner circumferential surface to the entire surface of the compressed plate 4 and the ordinary plate 7, and the cloth 11 is not fixed on the inner circumferential side as in the conventional case. No tension is applied, and the life of the cloth 11 can be greatly extended. Further, after dehydration, the vibration of the cloth 11 applied when peeling off the remaining cake spreads to the entire cloth, making it possible to efficiently remove the deposits on the cloth surface. The plurality of raised portions 14 provided on the ordinary plate 7 regulate the position of the cloth 11 on the side of the pressing plate 4, and also serve to prevent it from digging into the excess water guide groove 18 formed on the upper surface 6 of the ordinary plate 7. It has many practical effects.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figure 1 is a partially omitted sectional view showing the state of superposition of the pressing plate and the ordinary plate, Figures 2 and 3 are side views of the stock solution supply portions of the pressing plate and the ordinary plate, respectively, and Figure 4 is the cross-sectional view of the pressing plate and the ordinary plate. A partially omitted sectional view showing another embodiment, and FIG. 5 is a partially omitted sectional view showing the expanded state of the flexible plate of the pressing plate. 1... Frame body, 2... Over surface, 3... Flexible plate, 4
... Pressing board, 5 ... Frame part, 6 ... Over surface, 7
... Ordinary plate, 8 ... Stock solution hole, 9 ... Ring member, 9' ... Ring-shaped part, 10 ... Flange part,
11...cloth, 14...raised portion.

Claims (1)

[Claims] 1. A pressing plate, which is formed by providing a flexible plate on the inner side of a rigid picture frame-like frame body with a side surface that is thinner than the frame body, and a side surface that is thinner than the outer frame portion. In a compression type filter press consisting of alternating ordinary plates with a Either a ring member having a roughly V- or U-shape is fitted, or a ring-shaped part similar to the above-mentioned ring member is formed around the stock solution supply hole of the flexible plate itself. A thick ring-shaped part is formed on the periphery, and a cloth is coated from the inner circumferential surface of this ring-shaped part along the surface of the flexible plate to form a pressing plate, and a press plate is formed around the stock solution hole of the ordinary plate. , protruding portions having a substantially trapezoidal cross-sectional shape that protrude to the same extent as the frame of the plate in the thickness direction of the plate are formed in a radial arrangement around the concentrate passage hole, and a raised portion is formed in a radial arrangement around the concentrate passage hole, and A compressing type filter press characterized in that a plain plate is formed by covering the surface with cloth, and such compressed plates and ordinary plates are arranged alternately.