JPS58196199A - Belt press - Google Patents

Abstract

PURPOSE:To eliminate the sag of filter cloths during traveling and to improve the efficiency of dehydration, by placing rolls which are freely adjustable in pressurizing force so as to face the terminal part of roll groups of a belt press which dehydrates sludge, etc. under pressure. CONSTITUTION:A pair of rolls located at the terminal in roll groups are placed so as to face each other to form pressurizing rolls 3, 4 in a belt press wherein a pair of upper and lower filter cloths are extended in the roll groups freely movably. The pressurizing force of the rolls 3, 4 is made freely regulatable with a lever consisting of a lever 5 and an air cylinder 6, and rubber lining is applied on the rolls 3, 4. A groove for drainage is provided to the lower roll 4. Sludge, etc. are compressed and dehydrated under face contact by the above-mentioned constitution of the rolls, and the water oozing to the lower filter cloth side flows into the groove of the roll 4 and falls as the roll 4 rotates; therefore, the suction of said water again into the sludge is obviated.

Description

[Detailed Description of the Invention] This invention has a system in which a pair of upper and lower furnace cloths are freely runnable and run around a group of rolls arranged in large numbers, and sludge, etc. held between the upper and lower furnace cloths is dehydrated under pressure. This paper relates to improvements to belt presses.

Conventionally, the so-called belt press is a well-known method in which a pair of upper and lower furnace cloths is passed between a large number of parallel rolls, and the sludge, etc. held between these furnace cloths is pressurized and dewatered.
% As a means for pressurizing the sludge, a pair of furnace cloths is made to run in a staggered manner between parallel rolls, and the sludge, etc. Kl! I applied a shearing force.

A so-called press method is also well known, in which a piece of fabric that passes through these connections is pressurized from above and below to dehydrate it using rolls that are disposed opposite each other. However, among these known means, those that involve a shearing force action cannot be used! Ig
There is a limit to the tension of one hole to generate M force, and II
IIi - It is difficult to apply shear forces, and
Those that pressurize with opposing rolls have the disadvantage that the rolls are in contact with the edges, so the pressing time is short, and the water that oozes out during pressurization is absorbed by the dehydrated cake at once.

This invention solves the above-mentioned difficulties in piggybacking, and uses opposed rolls that can obtain pressure, and has a rubber lining on the surface of the rolls, so that surface pressure is applied instead of linear pressure to the sludge. In addition, this opposing roll is installed at the final stage of a group of many parallel rolls to apply higher pressure so that there is no hindrance (sagging, etc.) to the running of the cloth. bl.

This invention will be specifically explained below based on one drawing.
First, as shown in the figure, the structure is such that a pair of upper and lower P cloths 1.2 are freely runnable and passed around in a large number of parallel 9-1 loops, and the sludge held between these furnace cloths 1.2 is In the belt press configured to pressurize and dewater the above-mentioned rolls, at least a pair of upper and lower rollers located at the end Im in the group of rolls arranged in parallel are arranged to form a pressure roll 3.4, and these The upper P cloth 1 and the lower P cloth 2 are passed between the pressure rolls 3 and 4, and the pressing force of these pressure rolls 3.4 is adjustable. To explain this pressure force adjustment device in detail, the device shown in FIG. The pressure force on the sludge passing through can be freely changed. Pottery,
Reference numeral 7.8 indicates a drive roll for the upper and lower furnace cloths, 9 indicates a drive motor, 10 indicates a drive chain, 11 indicates a *g supply device for sewage sludge, etc., and 12 indicates a gravity dewatering sear 7.8.
13Fi drum for sludge biting;
The applied force should be smaller than that of . vctc
%Figure 2 d is a belt press equipped with another type of pressurizing force adjustment device, and with this one, the air cylinder 21
In this case, the upper and lower pressure rolls 3.4 are used as driving rolls for the upper and lower oven cloths 1.2, respectively. In this case, the power is transmitted from the motor 9 to the pressure roll 22 at the front stage via a chain 23, and from this pressure roll 22 via the chain 24 to the pressure roll 4 below.
Fi from this lower pressure roll 4 to the upper pressure roll 3
, so that the power is transmitted by gears (not shown). In this case, it goes without saying that the upper and lower pressure rolls 3.4 should be synchronized. Then, when the furnace cloth 1.2 around the dehydration drum 250 is traveling, it can be constructed so that it is pressurized by the pressure belt 26. The structure of the front stage of this dewatering drum 25 is approximately the same as that shown in FIG. In addition, the upper and lower pressure rolls provided at the final stage mentioned above are coated with two layers of rubber, and the lower pressure roll has a groove for dispensing with company water as shown in Figure 3. be.

The belt press according to the present invention is constructed as described above, and in the case of the belt press shown in FIG. 1, the stock solution supply device 11%
The sludge supplied to 1 gravity dewatering zone 12. Cake biting drum・13. Water is gradually dehydrated in the dewatering zone in front of jarring rolls 14 to 16, and finally dehydrated in the pressure roll section at the final stage, and the dehydrated water is received by troughs provided in each dewatering zone and discharged. However, in this case, with conventional equipment, it was difficult to completely collect and discharge the water dehydrated as described above, that is, the water squeezed from the sludge.

When shearing force or pressurizing force is applied to the sludge.

They are squeezed out of the sludge, but when the P cloth runs and these external forces are removed, they are sucked into the sludge.

Water could not be collected completely. However, in such a case, in the present invention, the pair of upper and lower pressure rolls 3.4 in the final stage are given rubber 2-years, and the lower pressure roll 4K is used for drainage. Therefore, when the pressure roll 3.4 pressurizes the sludge, the rubber lining part elastically deforms and changes from linear contact to surface shape against the sludge, which prevents long-term pressing and dewatering. It is necessary for 12-cho Noh.

The water I'i% that is squeezed in this way and appears on the lower hearth cloth flows into the groove provided in the pressure roll below, and as the pressure roll rotates, it sinks down and is dehydrated. It is possible to prevent the sludge from being sucked into the sludge again.Incidentally, to give an example of the pressure applied by this pressure roll, at linear pressure it is 14 hours.
kd or more and surface pressure of 4 or more, the dehydrated water will not flow backwards.

In addition, even if such a high pressure is applied, these pressure a-rules are the final dehydration zone, and the F fabric IF)
Since it is installed close to the roll, there are no problems such as sagging of the furnace cloth. 'For reference, the following is a comparison of the pressure applied to sludge by pressure rolls and the shearing method in which the rolls are arranged in a staggered manner. In other words, if the linear pressure mentioned above is 14~(20a+ in the roll diameter) and converted to surface pressure by considering the deformation of the lined rubber, it is 3.5~4.5.
~ becomes. On the other hand, if the surface pressure against the sludge is increased by increasing the tP45 tension, F! , even if the furnace cloth tension is set to 10 m and the medium diameter of the 9-wrap roll is 10 m, and the surface pressure is reduced to 10 -, only a pressure of 173 or less can be obtained compared to the pressure roll method. However, setting the furnace cloth tension to 10 or more is difficult to design due to the strength of each roll and bearing, so it is incomparable. In other words, in terms of filtration efficiency expressed as the product of pressure force and filtration time, the method using pressure rolls is far superior to the jarring method that relies on furnace cloth tension. As shown in the figure, pressure rolls can be arranged in parallel in multiple stages, or depending on the properties of the sludge, they can be used in combination with jarring rolls. It is also free to apply a crown to the pressure roll.

As explained above, the present invention completely separates running water, which could not be removed by separating it in the past, and increases the dewatering rate.
The benefits gained are enormous.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the belt press according to the present invention, Fig. 2 is a schematic side view of another embodiment, and Fig. #J3 is an enclosed view of the lower pressure roll 4.・ Code explanation L Upper furnace cloth 2 Lower furnace cloth 1 Pressure roll book Pressure roll & lever

Claims (1)

[Claims] (In a group of 11 rolls, a pair of upper and lower furnace cloths 1
, 2 are freely runnable, and in a belt press constructed by KM to pressurize and dewater the sludge sandwiched between these 1431. At least a pair of upper and lower rolls located in a pair -J,
A pressure roll 3.4 is constituted, and an upper furnace cloth l is placed between these rolls.
and the lower furnace cloth 2, and these pressurization rules 3.
．． A belt press characterized by the ability to freely adjust the pressing force in step 4. ill The above pair of pressure rolls 3, 4 WC rubber -
The belt press according to claim 11, characterized in that the pressure roller 4 located below is provided with a drainage hole. (81) Claim No. 1, wherein the pressurizing force adjustment device for the pressurizing roll is an exciter 21 provided at both ends IIK of the upper pressurizing roll 3 (belt press described in paragraph 1'1). The pressurizing force adjustment device for the pressurizing roll 3.4 consists of the upper pressurizing roll 3vc fixed Leno (-5) and a hydraulic cylinder 6 connected to the free end of this lever 5. +1) fJ4 Kiwa belt press.