JP3509442B2 - Tube press - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydration / filtration apparatus used for dehydration / filtration of various slurries produced in various factories, and more particularly, to a flexible space between a concentric filter cylinder and an outer cylinder casing. The present invention relates to a tube press which is partitioned by an elastic tube and which squeezes and filters a slurry by a pressure applied through the elastic tube.

[0002]

2. Description of the Related Art Generally, a slurry filtering device such as a belt filter, a drum filter, a centrifugal separator or a filter press is used for filtering various slurries produced in various factories. However, by setting the filtration pressure to a high pressure such as 100 kg / cm ² , it is possible to obtain a filtration state of 90% cake dry rate and 94% volume reduction rate. Such a tube press is recommended.

[0003] That is, FIG. 6 is an overall cross section of the tube press, known as a so-called "Python press", the tube press, filtration tube of the filtration tube A Toko formed a plurality of through holes a ₂ to the peripheral wall a ₁ An annular space formed between the outer cylinder casing B surrounding A and a flexible elastic tube C is defined. That is, a filtration filter D formed of a filter cloth is stretched on the outer peripheral surface of the filtration cylinder A, and a filtration chamber E and a pressurization chamber F are formed inside and outside the elastic tube C that is pressure-deformable. The slurry filtered from the slurry supply port G formed on the end wall a ₃ of A is injected into the filtration chamber E.

Therefore, in the tube press having such a structure, after the slurry is injected into the filtration chamber E, the slurry line reaching the slurry supply port G is shut off by the electromagnetic shut-off valve, and the pressure chamber applied from the pressure port H is applied. The elastic tube C is deformed by the pressure of F, the slurry is squeezed in the filtration chamber E, and the filtered water filtered by the filtration filter D is
It flows out through the through hole a ₂ and the filtrate discharge port I below the filter cylinder A to the outside. Then, the cake collected in the filtration chamber E is exposed to the outside of the outer casing B by lowering the filtration barrel A with a hydraulic cylinder, and the air blow hole J
Due to the intermittent pressurization of the air pulse applied to the filter, the filter is separated from the filtration filter D and dropped and collected downward.

[0005]

By the way, in the above-described slurry squeezing / filtering process, high-pressure oil is supplied from the pressure port H to elastically deform the elastic tube C, so that the capacity of the filtration chamber E changes. However, if such pressing and filtration are repeated, a part of the elastic tube C may be broken early and cannot be used. That is,
In this compression / filtration process, it is assumed that the slurry line is completely shut off, but the actual electromagnetic shut-off valve had a slight leak from the beginning, and the electromagnetic shut-off valve had a slight leak due to use. May occur. In the case of such a leak, the pressure in the slurry supply port G becomes locally low, so that the elastic tube C is caused by the pressure in the pressurizing chamber F.
Is partially deformed toward the inside of the slurry supply port G.

For this reason, the abnormal deformation portion c ₁ of the elastic tube C is strongly pressed at the opening edge portion of the slurry supply port G, deforms and enters the opening edge, and local stress causes early fatigue, resulting in the abnormal deformation. Since the part c ₁ is broken, the entire elastic tube C cannot be used, which is an obstacle to practical use of the tube press. Further, such a local abnormal deformation of the elastic tube is caused by adding a washing water line for introducing cake washing water into the filtration chamber E from the slurry supply port G to the slurry line after pressing and compressing the elastic tube C. When the electromagnetic shutoff valve of the flush water line has a slight leak, the abnormal deformation portion c ₁ is similarly generated in a part of the elastic tube C. In view of the problems of the conventional tube press as described above, the object of the present invention is not to cause local abnormal deformation of the elastic tube, and to know early when abnormal deformation occurs in the elastic tube. To get a tube press that can.

[0007]

In order to achieve this object, the present invention provides a filter cylinder having a large number of through holes in its peripheral wall and an outer peripheral surface covered with a filter, and an outer cylinder casing surrounding the filter cylinder. The annular space formed between the elastic chambers is divided by a flexible elastic tube to form a filtration chamber and a pressurizing chamber inside and outside the elastic tube, and the filtration chamber is applied by pressure applied to the pressurizing chamber through the elastic tube. In a tube press for squeezing and filtering the slurry injected therein, at least two electromagnetic cutoff valves that can be automatically opened and closed are installed in series in a slurry line that supplies the slurry to the filtration chamber, and a pressure state between both electromagnetic cutoff valves is incorporated. We propose a tube press in which a pressure gauge that indicates is placed between both electromagnetic shutoff valves.
Further, according to the present invention, an object of the present invention is to provide an annular space formed between a filtration cylinder having a large number of through holes formed in a peripheral wall and having an outer peripheral surface covered with a filtration filter, and an outer cylinder casing surrounding the filtration cylinder. By partitioning with a flexible elastic tube, a filtering chamber and a pressurizing chamber are formed inside and outside the elastic tube, and the slurry injected into the filtering chamber is squeezed by the pressure applied to the pressurizing chamber through the elastic tube. In a tube press for filtering, at least two electromagnetic shutoff valves that can be automatically opened and closed are installed in series in a wash water line that supplies cake wash water to the filtration chamber, and a pressure gauge that indicates a pressure state between both electromagnetic shutoff valves is installed. This is achieved by a tube press placed between both electromagnetic shutoff valves.

Further, in the description of the preferred embodiment of the present invention described later, the pressure gauge is equipped with a pressure detector capable of operating at an abnormal pressure higher than a certain pressure, and an alarm is issued by a detection signal of this pressure detector. The configuration and the configuration in which the pressure gauge includes a pressure detector capable of operating at an abnormal pressure of a certain pressure or higher, and the detection signal of the pressure detector causes an emergency stop of the operation of the tube press will be described.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows the details of a tube press according to the invention, which tube press
A filtration device capable of injecting washing water after filtration to remove water-soluble salts of impurities contained in a cake, and a filtration cylinder 1 having a large number of through holes 2 formed in a peripheral wall 1a, and surrounding this filtration cylinder 1. An outer cylinder casing 3 is provided, and a filtration filter 4 made of a filter cloth is stretched on the outer peripheral surface of the filtration cylinder 1.

Although a cylindrical annular space is formed between the outer peripheral surface of the filter cylinder 1 and the inner peripheral surface of the outer cylinder casing 3, the annular space has flanges 5a at both ends. Is divided by a rubber elastic tube 5 fixed to the outer cylinder casing 3, and a filtration chamber 6 and a pressure chamber 7 are formed inside and outside the elastic tube 5. That is, the slurry supply port 8 formed in the end wall 1b of the filtration cylinder 1 is connected to the slurry line 9 guided from the slurry tank ST, and the slurry S filtered from the slurry supply port 8 is supplied to the filtration chamber 6. Injected inside.

The flanges 5a at both ends of the elastic tube 5 are hermetically sealed to the outer cylinder casing 3 by the flange portion 12a and the ring-shaped end plate 13 which are fixed to the outer cylinder casing 3 by the fixing bolts 10 and 11, respectively. A pressurizing chamber 7 that is fixed and closed between the elastic tube 5 and the inner peripheral surface of the outer casing 3 is formed. Therefore, the pressurizing chamber 7
The pressure port 14 communicating with the pressure port 14 is subjected to pressure and vacuum pressure of the pressure oil from a pressure oil pipe line (not shown), and the elastic tube 5 is elastically deformed by these pressure oil pressure and vacuum pressure. .

At the center of the lower end wall 1b of the filter cylinder 1,
A filtrate outlet 15 is formed to allow the filtrate that has flowed through the through hole 2 into the filter cylinder 1 to be discharged to the outside. Although not shown, a filtrate hose is connected to the filtrate outlet 15. The filtrate collected in the waste liquid hose is transferred to the subsequent processing step. A vertical hydraulic cylinder 16 is fixed to the mounting bracket 12, and a plunger rod 16a of the hydraulic cylinder 16 is attached to an upper end wall 1c of the filtration cylinder 1.
Since it is touched with a pin, the hydraulic cylinder 16 is operated in the step of discharging the cake K after the squeezing and filtering of the slurry S, the filter cylinder 1 is lowered with respect to the outer cylinder casing 3, and is exposed from the outer cylinder casing 3. The cake K on the outer peripheral surface of the filter cylinder 1 drops and is collected downward. In order to facilitate the collection of the cake K, an air blow hole 17 is formed in the upper end wall 1c of the filtration cylinder 1, and an intermittent air pulse is applied to the air blow hole 17 in the cake K discharging process, so that the air blow hole 17 can be removed. The cake K attached to the surface of the filtration filter 4 is peeled off by the intermittent pressurization from the above, and the cake K that has become a fragment is dropped below the outer cylinder casing 3.

The slurry line 9 connected to the above-mentioned slurry supply port 8 is provided with manual opening / closing valves MV ₁ and MV ₂ which can be forcibly opened / closed manually by the operator at the start of operation or maintenance.
According to the present invention, in the slurry line 9, operating steps automatically two electromagnetic shut-off valve EV is opened and closed by _1, EV ₂ is incorporated in series, these off valve EV _1, EV ₂
A pressure gauge 19 is arranged which can monitor the pressure in the line between the two. Further, the pressure gauge 19 is provided with a pressure detector 20 which is operated at an abnormal pressure higher than a certain pressure, and a detection signal of the pressure detector 20 is input to the control unit CPU shown in FIG. That is, the control device CPU controls each operating part of the tube press during operation, but when the pressure detector 20 detects an abnormal pressure, the control device CPU controls the alarm device 21 and the emergency circuit breaker 22. An output signal is outputted to notify the occurrence of abnormality acoustically or visually, and the operation of the tube press is stopped to prevent local fatigue of the elastic tube 5 in advance.

In the illustrated embodiment, the slurry line 9
A washing water line 23 led from the washing water tank WT is connected to the washing water tank WT, and two electromagnetic shutoff valves EV ₃ and EV ₄ are connected to the washing water line 23 as in the above-mentioned slurry line 9.
Are installed in series, and these electromagnetic shutoff valves EV ₃ , EV
_A pressure gauge 19A is provided which can monitor the pressure in the line between the _four . Further, the pressure gauge 19A is additionally provided with a pressure detector 20A which is operated at an abnormal pressure equal to or higher than a certain pressure, and a detection signal of the pressure detector 20A is input to the control device CPU described above.

Of course, if it is not necessary to remove the water-soluble salts of impurities contained in the cake K, it is needless to point out that the washing water line 23 is omitted.

Since the tube press according to the illustrated embodiment has the above-mentioned structure, the slurry S can be processed by the steps shown in FIGS. First, as shown in FIG. 2A, the slurry S is injected into the filtration chamber 6 from the slurry tank ST through the filtration chamber 6 and the slurry supply port 8.
After the electromagnetic shutoff valves EV ₁ and EV _{2 of} the slurry line 9 are completely closed, pressurized oil is supplied from the pressure port 14 into the pressurizing chamber 7 as shown in FIG. Due to the elastic deformation of 5, the slurry S in the filtration chamber 6 is squeezed, the water contained in the slurry S is filtered by the filtration filter 4, and is discharged from the filtrate discharge port 15.

In this pressing / filtering process, the filtration chamber 6 is provided in the slurry line 9 which is in communication with the slurry supply port 8.
However, when both electromagnetic shutoff valves EV ₁ and EV ₂ are completely closed and there is no leakage, the pressure inside the slurry supply port 8 is kept the same as the pressure inside the filtration chamber 6. Therefore, the portion of the elastic tube 5 corresponding to the slurry supply port 8 does not locally deform. In this case, if there is a slight leak in the electromagnetic shutoff valve EV ₁ , the pressure gauge 1
Since 9 indicates an abnormal pressure, this abnormal pressure state is detected by the pressure detector 20, the alarm device 21 notifies the abnormal state, and the emergency breaker 22 immediately stops the operation. Therefore, damage and fatigue due to local abnormal deformation of the elastic tube 5 are prevented in advance.
It is possible to prevent early fatigue.

After this, as shown in FIG. 3, the pressure port 1
Although the vacuum pressure is applied to the elastic tube 5 and the elastic tube 5 is deformed into the pressurizing chamber 7, the cleaning water line 23
The cleaning water is supplied to the slurry supply port 8 from the above, and the cleaning water is filled in the filtration chamber 6. In this washing step, the pressurized oil is then supplied again to the pressure port 14, the washing water permeates the cake K in the filtration chamber 6, and the washing water removes the water-soluble salts of impurities contained in the cake K. It is washed out from the through hole 2 into the filter cylinder 1.

After the above-mentioned cleaning process, the slurry supply port 8
Is released to the atmosphere, a vacuum pressure is applied to the pressure port 14 to deform the elastic tube 5 into the pressurizing chamber 7, and then the hydraulic cylinder 16 is operated to move the outer cylinder casing 3 to the outer cylinder casing 3 as shown in FIG. On the other hand, the filter cylinder 1 is lowered, and the lower half portion of the filter cylinder 1 is exposed below the outer cylinder casing 3. Then, in this cake extracting step, since the air pulse is applied to the air blow hole 17, the cake K attached to the filtration filter 4 is broken by the pressure of the intermittent air pulse,
It is separated from the filter cylinder 1 and discharged below the outer cylinder casing 3.

[0020]

As is apparent from the above description, according to the present invention, two or more electromagnetic shutoff valves are incorporated in the slurry line and the washing water line, respectively, and the pressure gauge is used to connect these electromagnetic shutoff valves. Since the pressure state of (1) is monitored, it is possible to prevent local abnormal deformation in the compression / filtration process of the elastic tube. Further, in the present invention, when a pressure detector that can operate at a constant pressure is attached, even a slight leak of the electromagnetic shutoff valve can be automatically detected, and an alarm can be issued and the tube press can be stopped urgently. It has the effect of operating safely and extending the life of the elastic tube.

[Brief description of drawings]

FIG. 1 is a detailed view showing the relationship between a tube press and a slurry pipeline according to the present invention.

2A and 2B are explanatory views of a slurry injection step and a pressurizing step of the tube press.

FIG. 3 is an explanatory diagram of a cake washing process of the tube press.

FIG. 4 is an explanatory diagram of a cake removing step of the tube press.

FIG. 5 is a block diagram of the tube press.

FIG. 6 is an overall cross-sectional view of a conventional tube press.

FIG. 7 is an enlarged cross-sectional view of a main part of the tube press.

[Explanation of symbols]

1 Filter Cylinder 2 Through Hole 3 Outer Cylinder Casing 5 Elastic Tube 6 Filtration Chamber 7 Pressurizing Chamber 8 Slurry Supply Port 9 Slurry Line 14 Pressure Port 15 Filtrate Discharge Port 16 Hydraulic Cylinder 17 Air Blow Holes 19, 19A Pressure Gauge 20 Pressure Detector 23 Wash water line K Cake S Slurry EV _{1 to} EV ₄ Solenoid shutoff valve

Continuation of front page (56) Reference JP-A-2-265609 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 29/11 B30B 9/06

Claims (4)

(57) [Claims] 1. A flexible elastic tube defines an annular space formed between a filter cylinder having a large number of through holes formed in a peripheral wall and an outer peripheral surface covered with a filter and an outer cylinder casing surrounding the filter cylinder. A filter chamber and a pressurizing chamber are formed inside and outside the elastic tube, and in a tube press for squeezing and filtering the slurry injected into the filter chamber by the pressure applied to the pressurizing chamber through the elastic tube, At least two electromagnetic shutoff valves that can automatically open and close are installed in series in the slurry line that supplies the slurry to the filtration chamber, and a pressure gauge that indicates the pressure state between the electromagnetic shutoff valves is placed between the electromagnetic shutoff valves. A tube press characterized by. 2. An annular space formed between a filter cylinder having a large number of through holes formed in a peripheral wall and having an outer peripheral surface covered with a filter and an outer cylinder casing surrounding the filter cylinder is partitioned by a flexible elastic tube. A filter chamber and a pressurizing chamber are formed inside and outside the elastic tube, and in a tube press for squeezing and filtering the slurry injected into the filter chamber by the pressure applied to the pressurizing chamber through the elastic tube, At least two electromagnetic shutoff valves that can be automatically opened and closed are installed in series in the wash water line that supplies the cake wash water to the filtration chamber.
A tube press characterized in that a pressure gauge for indicating a pressure state between both electromagnetic shutoff valves is arranged between both electromagnetic shutoff valves. 3. The pressure gauge according to claim 1, wherein the pressure gauge includes a pressure detector capable of operating at an abnormal pressure higher than a certain pressure, and an alarm is issued by a detection signal of the pressure detector. Tube press. 4. The pressure gauge is provided with a pressure detector capable of operating at an abnormal pressure higher than a certain pressure, and the operation of the tube press is urgently stopped by a detection signal of the pressure detector. The tube press according to claim 2.