JPS6344239Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a belt press type dewatering machine using a pressure band system for continuously compressing and dewatering various mud materials.

[Prior art]

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

The lower the water content of the dehydrated cake obtained with such a dehydrator, the better.Since the water content of the dehydrated cake is a function of the pressing time and pressing pressure,
In order to lower the moisture content, it is possible to lengthen the compression time or increase the compression pressure, but in order to obtain the required moisture content, it is necessary to increase the compression time and compression pressure at the same time from an economical perspective. It is desirable to make it larger.

By the way, the squeezing pressure P by the pressure band is P=F/R where, F: tension of the pressure band R: radius of the squeezing roll, the squeezing time T is T=αR, and the squeezing pressure P is the pressure It is proportional to the tension of the band and inversely proportional to the diameter of the squeeze roll, and the squeeze time T is proportional to the diameter of the squeeze roll. Therefore, in order to increase the compression pressure and compression time, it is necessary to increase the tension of the pressure band and increase the diameter of the compression roll.
That is, as an index of the water content of a dehydrated cake, the higher PT, which is the product of the pressing pressure P and the pressing time T, is, the lower the water content is.

It is relatively easy to increase the diameter of the pressing roll in order to increase the pressing time T, but in order to increase the pressing pressure P, the requirements required for the pressing band are that it has high tensile strength, flexibility, and high tensile strength due to its intended use. It is difficult to apply pressure uniformly to the contact surface, and conventional pressure bands often have a wire mesh structure or a structure consisting of multiple belts.

However, those with a wire mesh structure have a limited tensile strength, and there are also problems with strength against uneven deformation, and those with a structure consisting of a plurality of belts cannot be expected to have much tensile strength. Therefore, it was not possible to increase the PT value.

[Purpose of invention]

The purpose of the present invention is to provide a belt press type dehydrator that satisfies the requirements for a pressure band as described above and can continuously and effectively obtain a dehydrated cake with an extremely low moisture content over a long period of time. That is.

[Structure of the idea]

The present invention involves hanging endless cloth belts so that they can run parallel to the press rolls in a face-to-face polymerized state, pinching and dewatering the mud with these cloth belts, and directing the cloth belts toward the outer peripheral surface of the press rolls. In a belt press type dehydrator equipped with a pressure band for applying pressure, the pressure band has a structure in which link plates are rotatably overlapped with pins, and at least both ends of the pressure band are leaf-shaped. The present invention is characterized in that it has a chain structure, and that a protrusion that faces and engages the leaf chain structure is attached to at least one of the rolls that guide the pressure band.

〔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 cloth belt 3 and an endless cloth belt 4 which is not supplied with sludge 1 are hung around a large number of rolls so as to run in parallel in a face-to-face overlapping state. These cloth belts 3 and 4 are both made of water-permeable or water-absorbing material, and the cloth belt 3 is hung over a plurality of guide rolls 5 and 5' and a tension roll 7 which also serves as a guide roll and is equipped with a tension device 6. The cloth belt 4 has 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. Then, these cloth belts 3 and 4 are brought into a face-to-face polymerized state immediately before the press roll 11a, and are successively placed on the press 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 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 roll. It is hung on a tension roll 15 which is also equipped with a tension device 14, and can be moved by the rotation of the squeeze roll 11b.

In the figure, reference numeral 16 indicates a cleaning shower for the cloth belts 3 and 4, and reference numeral 17 indicates a dewatering cake.

The structure of the pressure band 12 includes a link plate 18 having two holes for pins in a cocoon-shaped flat plate as shown in FIG. 2, or a wire rod bent into a cocoon shape and joined together as shown in FIG. link plate 1
8' to pin 1 as shown in FIGS. 4 and 5.
It is rotatably polymerized at 9 and has a structure similar to commercially available leaf chains. Further, it is preferable that the outer periphery of each link plate 18 has a shape that approximately matches the curvature of the pressing roll 11b.

In this way, the pressure band 12 has a structure similar to that of a commercially available leaf chain, so it can be extremely strong, and since the link plate 18 is rotatable at the pin 19, it can be easily applied to the cloth surface. It satisfies all the requirements for the pressure band 12, such as having strong tensile strength, flexibility, and applying pressure uniformly to the contact surface, as described above. can be increased.

However, when the axis of the pin 19 in the pressure band 12 forming part and the axis of the squeeze roll 11b with which the pressure band 12 is pressed are not parallel, the pin 19
There is a risk that twisting may occur in the pressure band 9, and if this twist becomes large, the flexibility of the pressure band 12 will be lost, and the squeezing performance will deteriorate.
This can also lead to damage to other parts.

Therefore, as shown in FIGS. 6 and 7,
At least both end portions of the pressure band 12 have a leaf chain structure 20, and a protrusion 21 that faces and engages with the leaf chain structure 20.
is attached to at least one of the guide rolls 13.

By doing this, the pressure band 12
Since the leaf chain structure 20 of the guide roller travels while being engaged with the projection 21 of the guide roll, the pressure band 12 is prevented from meandering or twisting, and the flexibility of the pressure band 12 is always maintained. Its compressibility is not deteriorated and damage is also prevented.

Note that it is convenient to create an appropriate gap by inserting a washer between the link plates 18 to facilitate the discharge of separated water when pressurized. 18
This is also possible by adjusting the length of.

[Effect of idea]

As described above, according to the present invention, the requirements required for a pressure band can be satisfied.
It is easy to increase the PT value, and it is possible to continuously and effectively obtain a dehydrated cake with a much lower water content than conventional equipment for a long period of time.Moreover, it is possible to prevent meandering and damage of the pressure band. This has the extremely useful effect of prolonging the life and increasing the durability of the entire device.

[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, FIG. 6 is a plan view of the vicinity of the end of the pressure band, and FIG. 7 is a sectional view showing the engaged state of the pressure band and the squeeze roll. 1... Sludge, 2... Supply section, 3, 4... Cloth belt, 5, 5', 8, 13... Guide roll, 6,
9, 14... tension device, 7, 10, 15... tension roll, 11a, 11, 11b... compression roll,
12...Pressure band, 17...Dehydrated cake, 1
8, 18'...link plate, 19...pin,
20...Leaf chain structure, 21...Protrusion.

Claims (1)

[Claims for Utility Model Registration] 1. Endless cloth belts are hung on pressing rolls so that they can run in parallel in a face-to-face polymerized state, and the cloth belts pinch and press muddy materials to dehydrate them, and the cloth belts are also compressed as described above. In a belt press type dehydrator equipped with a pressure band for applying pressure toward the outer peripheral surface of the roll, the pressure band has a structure in which link plates are rotatably overlapped with pins, and the pressure band is A belt press type dehydrator characterized in that at least both end portions have a leaf chain structure, and a protrusion that faces and engages the leaf chain structure is attached to at least one of the rolls that guide the pressure band. Machine. 2. The belt press type dehydrator according to claim 1, wherein the outer periphery of the link plate is shaped to match the curvature of the squeeze roll. 3. The belt press type dehydrator according to claim 1 or 2 of the utility model registration claim, wherein a washer is inserted between the link plates.