JPH0120079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a highly efficient roll press that continuously processes various types of slurry in large quantities to reduce the water content.

[Conventional technology]

A pressure band type belt press type dewatering machine has, for example, an endless filter cloth belt hung on a press roll in a face-to-face polymerized state so that it can run in parallel, and these filter cloth belts remove sludge (hereinafter referred to as "sludge"). While traveling while pinching the water, squeezing pressure is further applied by a pressure band to perform dehydration.

[Problem that the invention attempts to solve]

The squeezing pressure P by this pressure band is P=F/R Here, F: tension of pressure band R: radius of squeeze roll The compression time T is T=αR It is.

By the way, in order to reduce the moisture content of the dehydrated cake, it is necessary to increase the pressing pressure P and the pressing time T, but it is relatively easy to increase the pressing roll diameter R in order to increase the pressing time T. However, increasing the tension F in order to increase the squeezing pressure P had limited tensile strength and also had problems with strength against uneven deformation, so it was not very promising.

The present invention increases the tension of the pressure band and further compensates for the tension, resulting in a surface pressure of 4 to 5 kg/
The aim is to obtain a ^dehydrated cake that reaches the final moisture content limit.

[Means for solving problems]

The present invention involves hanging endless filter cloth belts in a state of facing polymers so that they can run parallel to the press rolls, compressing and dewatering muddy materials with these filter cloth belts, and transferring these filter cloth belts to the press rolls. In a belt press type dehydrator equipped with a pressure band for applying pressure toward an outer peripheral surface, the outer peripheral surface of the pressure band is coated with a deformable water-impermeable elastic member facing the squeeze roll. It is characterized in that at least one roll is provided.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is an explanatory diagram of the overall structure of a pressure band type belt press type dewatering machine, which is an endless type having a supply section 2 for sludge 1. A filter cloth belt 3 and an endless filter cloth belt 4 which is not supplied with sludge 1 are hung around a number of rolls so as to run in parallel in a face-to-face polymerized state. These filter cloth belts 3 and 4 are both made of water-permeable or water-absorbing material, and the filter cloth belt 3 is hung on a plurality of guide rolls 5 and 5' and a tension roll 7 that also serves as a guide roll and is equipped with a tension device 6. The filter cloth belt 4 includes a guide roll 8 and a tension roll 1 which also serves as a guide roll and is equipped with a tension device 9.
It is attached to 0. These filter cloth belts 3 and 4 are in a face-to-face polymerized state immediately before the squeeze roll 11a, and are successively pressed into the squeeze rolls 11a, 11, 11.
While passing through b, it is compressed and dehydrated, and is released immediately after the guide roll 5'.

Further, one of the press rolls 11b is provided with an endless pressure band 12 for pressurizing the filter cloth belts 3 and 4 toward their outer peripheral surfaces, and this pressure band 12 is connected to a guide roll 13 and a guide. It is hung on a tensioning roll 15 which also serves as a roll and is equipped with a tensioning device 14 (a tension of 20 to 200 kg/cm ² is effective), and can be moved by the rotation of the pressing roll 11b.

In the figure, 16 indicates a cleaning shower for the filter cloth belts 3 and 4, and 17 indicates a dewatered cake.

Further, the structure of the pressure band 12 may be a water-permeable wire mesh belt, but
Two holes for pins are made in the cocoon-shaped flat plate as shown in Figure 2.
The link plate 18 with the space open and the link pleat 18', which is made by bending wire rods into a cocoon shape and joining them together as shown in FIG. 3, can be rotated by pins 19 as shown in FIGS. 4 and 5. Polymerized to create a structure similar to commercially available leaf chains, etc.
The outer periphery of each link plate 18 is compressed by a pressing roll 11b.
It is preferable to have a shape that approximately matches the curvature of.

In this way, if the pressure band 12 has a structure similar to a commercially available roller chain, it can be made extremely strong, and since the link plate 18 is rotatable at the pin 19, it can be attached to the filter cloth surface. It satisfies all the requirements for the pressure band 12, such as strong tensile strength, flexibility, and uniform pressure on the contact surface, and increases the squeezing pressure by the pressure band 12. can be done.

Note that it is convenient to create an appropriate gap by inserting a washer between the link plates 18 to facilitate drainage of the water separated during pressurization. plate 1
This is also possible by adjusting the length of 8.

Furthermore, as clearly shown in FIG.
A pressure roll 11c facing the
At least one pressure roll 11c is provided with a deformable water-impermeable elastic member 2 on the surface layer of the pressure roll 11c.
0, and each press roll 11c is equipped with a press device 2.
1 is provided.

The elastic member 20 needs to have a thickness that is sufficiently deformed by the pressing force to form a wide contact surface, and is preferably 5 mm or more.

Thus, the sludge 1 is supplied from the supply section 2 onto the running filter cloth belt 3, and transferred while being pinched between the filter cloth belts 4 running in parallel with the filter cloth belt 3 in a face-to-face polymerized state. 11 and 11b, and further subjected to strong pressure dehydration in the press roll 11b section by a pressure band 12 that can press the filter cloth belts 3 and 4, and then the filter cloth belts 3 and 4 are separated and dehydrated. The cake 17 is peeled off, but in addition to the strong pressure applied by the pressure band 12, the pressure roll 11c is applied by the pressure band 12.
The elastic member 20 on the surface layer of the press roll 11c deforms in response to the pressing force, increasing the contact area, and the press band 12
The pressure applied to the sludge is further increased, and the squeezing time is also increased, so that the sludge can be dehydrated without spreading or protruding, making it possible to simultaneously process a large amount of water and lowering the water content, and also improve the peelability of the dehydrated cake.

In addition, the press roll 1 that the pressure band 12 comes into contact with
It is also preferable to cover the surface layer 1b with a water-impermeable elastic member, and the hardness of this elastic member may be a suitable one that can be deformed. This is preferable in terms of preventing wrinkles from forming on the garro cloth.

Furthermore, when a plurality of pressure rolls 11c are provided, it is preferable that the hardness of the elastic member 18 is gradually increased in the running direction of the filter cloth belts 3, 4. This is because as the hardness gradually increases, the pressure gradually increases and a dehydrated cake with a lower water content can be obtained more effectively.

In addition, as the elastic member 20, rubber or other polymeric materials can generally be used, and its hardness is preferably 75 degrees or less, equivalent to the hardness of rubber, and it is necessary that it is not water-absorbing and water-impermeable. This is because when a water-absorbing elastic member is pressurized with a pressure roll, the absorbed water is pushed out and absorbed into the cake side.

Further, it is desirable to form a flow path for the dewatered filtrate in the elastic member 20 and to form grooves along the circumferential direction on the outer periphery of the press roll 11b, which has the advantage of increasing the sludge dewatering effect.

[Effect of idea]

As described above, according to the present invention, by providing a pressure band, it is easy to increase the P and T values, and moreover, a pressure roll having an elastic member can apply pressure from above the pressure band. Since it is possible to apply pressure higher than a band intermittently in a trapezoidal manner, the synergistic effect of high surface pressure and high shear makes it possible to obtain a dehydration effect with a much lower water content than conventional equipment. This has the extremely useful effect of also increasing overall durability.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an explanatory view of the overall structure, Fig. 2a is a side view of the link plate, Fig. 2b is a front view thereof, and Fig. 3a is a diagram of the link plate. A side view showing another example, FIG. 3b is a front view thereof, and FIG. 4 is a partial plan view of the pressure band.
FIG. 5 is a side view thereof, and FIG. 6 is an enlarged explanatory view of the vicinity of the press roll. 1... Sludge, 2... Supply section, 3, 4... Filter cloth belt, 5, 5', 8, 13... Guide roll, 6,
9, 14... tension device, 7, 10, 15... tension roll, 11a, 11, 11b... compression roll,
11c...press roll, 12...pressure band, 1
7... Dehydrated cake, 18, 18'... Link plate, 19... Pin, 20... Elastic member, 21...
...Press device.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Endless filter cloth belts are hung on a squeeze roll in a face-to-face polymerized state so that they can run parallel to each other, and these filter cloth belts pinch and dehydrate muddy materials. In a belt press type dehydrator equipped with a pressure band for pressurizing a cloth belt toward the outer peripheral surface of the pressing roll, a deformable water-impermeable material is provided on the outer peripheral surface of the pressing band facing the pressing roll. A sludge dewatering device comprising at least one pressure roll coated with an elastic member. (2) The sludge dewatering device according to claim 1, wherein the outer peripheral surface of the pressing roll that contacts the pressure band is coated with a water-impermeable elastic member. (3) Utility model registration claim 2, wherein the hardness of the elastic member covering the pressing roll is greater than the hardness of the elastic member covering the pressing roll.
Sludge dewatering equipment as described in Section 1. (4) Utility model registration claims 1 to 3, in which a plurality of the pressure rolls are arranged, and the hardness of the elastic member covering the pressure rolls increases as the filter cloth belt travels. A sludge dewatering device according to any one of the following items.