JPS6121712A - Washing filter cloth for dehydrator and its device - Google Patents

Abstract

PURPOSE:To wash filter cloth efficiently for a short period by supplying detergent while rotating a wash roll holding a filter cloth in the counter-turning direction and washing the filter cloth. CONSTITUTION:A pair of wash rolls 3 capable of holding a filter cloth 2 is installed. The wash roll 3 with an abrasive surface to filter cloth 2 can be turned in a counter direction to the running direction of the filter cloth 2 using a motor as a drive source. In addition, the roll 3 can exude or inject chemical detergent. A detergent used for washing flows into a liquid receptacle and then is returned into a liquid tank 4. A supernatant liquid in the tank 4 is recycled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and apparatus for chemically cleaning the r-cloth to which residual sludge is fixed, in a dewatering machine that uses r-cloth to dehydrate various types of sludge. It is.

[Conventional technology]

Sludge generated from clean water, sewage, pulp, etc. is dehydrated using an R-cloth using a vacuum rotary, belt press, or pressure dehydrator, and the solids formed on the R-cloth are peeled off and removed. After the dewatering process is completed, the r-cloth is washed to release or peel off residual sludge adhering to the surface of the r-cloth and sludge stuck between the fibers in a clogging state, thereby activating the filtration ability of the r-cloth.

Conventionally, there have been two methods of cleaning r-cloth: a high-pressure jet cleaning method and a chemical cleaning method.

The high-pressure washing injection method performs cleaning work by spraying high-pressure washing water onto the fabric surface, and the chemical cleaning method is suitable for cleaning fabrics that have been dehydrated from sludge tempered with a flocculant. In consideration of the chemical properties of the clogging substances, for example, sewage dewatering cloths were soaked in a diluted solution of hydrochloric acid in a chemical bath.

[Problem that the invention seeks to solve]

However, in the high-pressure washing method, the back side of the cloth remains unwashed.
It was unsuitable for cleaning r cloth with chemical substances adhering between the fibers. In addition, the chemical cleaning method uses a dangerous cleaning solution and cannot perform dynamic operations such as rinsing, so the cleaning effect is insufficient. Therefore, a long bath washing time is required, and the washing liquid is disposable, making it uneconomical.

[Means and effects for solving the problems] In view of the various conventional cleaning methods described above, the present invention sandwiches a piece of cloth between a pair of cleaning rolls having abrasive surfaces, and applies a chemical cleaning liquid from the rolls to the cloth surface. The r-cloth is washed by rotating the roll in the opposite direction to the running direction of the r-cloth while supplying the washing liquid, and the used cleaning liquid is circulated so that it can be reused.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

In Fig. 1, 1 is a liquid tank for flocculated sludge, 2 is an R cloth,
These are conventionally known. A pair of cleaning rolls 3 are installed so that the cloth 2 can be sandwiched therebetween.

The cleaning roll 3, whose surface is the one that rubs against the r-cloth 2, can be rotated in the opposite direction to the traveling direction of the r-cloth 2 using, for example, a motor as a drive source, and the roll 3 does not exude chemical cleaning liquid. It is possible to eject.

That is, as shown in FIGS. 2 and 3, a certain amount of chemical cleaning liquid is stored in a liquid tank 4 and supplied to each roll 3 by a pump 5. The component content of the cleaning liquid is determined by the flocculant mixed with the sludge. For example, in the case of flocculated sludge prepared by mixing slaked lime with sewage sludge, an acidic liquid containing 3 to 5% hydrochloric acid is used as the cleaning liquid.

The cleaning liquid is press-fitted from the liquid supply port formed at one end of each roll 3, oozes or squirts out from the rubbing surface, and is used for cleaning the cloth 2.The cleaning liquid is otherwise used for cleaning the cloth 2 from the liquid outlet formed at the other end of the roll 3. Reflux to 4. A pipe 6 connecting the liquid outlet and the liquid tank 4
A valve 7 is installed at , and the amount of cleaning liquid oozing from the roll 3 is controlled by a pressure gauge 8 . The cleaning liquid discharged from the roll 3 and used for cleaning the r cloth 2 flows down into a liquid receiving tank 9 installed directly below, and returns to the liquid tank 4 via a pipe 10.

The cleaning liquid flowing downward through the r-cloth 2 through both rolls 3 is stopped by a liquid stop plate 11 installed horizontally in the middle of the r-cloth 2 so as to be in contact with the upper surface of the r-cloth 2, as shown in FIG. The liquid is guided to the end, flows down into the liquid receiving tank 9, and is collected.

□ A plurality of partition plates 12 are arranged inside the liquid tank 4. This is to prevent waves from being generated on the liquid surface when the cleaning liquid flows back into the liquid tank 4 as described above, and also to prevent ripples from forming on the liquid surface.
This is for storing generated sludge containing dirt that has fallen off from the cloth 2, and the supernatant liquid in the liquid tank 4 can be used as the cleaning liquid to be circulated and supplied.

The cleaning liquid may be supplied to both rolls 3 as described above, or may be supplied only to the roll 3 on the upper side of the r-cloth 2. Furthermore, if the pH value falls below a certain standard by circulating and reusing the cleaning solution, it is possible to add new cleaning solution or chemicals to adjust the pH, and the pH can be adjusted to an appropriate level without the need for new replenishment. It may be used up by continuing reflux. We also manage the amount of sludge generated.
The sludge may be discharged from the liquid tank 4 as appropriate.

Dehydrated flocculated sludge prepared using a polymer flocculant
The cloth 2 is subjected to alkaline cleaning, and caustic soda diluted water may be used as the cleaning liquid.

As mentioned above, the cleaning roll 3 rotates in the opposite direction to the traveling direction of the r cloth 2 to rub the f cloth surface and cleans the r cloth 2 while supplying the cleaning liquid. Although it is desirable that the rotational speed is at most 3, the relative speed can be arbitrarily selected depending on the material of the cloth and the content of the flocculant.

Furthermore, the rotational speeds of the rolls 3 may be the same speed or different speeds, and these are matters that can be arbitrarily determined. Further, the relative positional relationship between the rolls 3 can be adjusted by means of the interaxial support 13, and the clamping pressure on the two surfaces of the r cloth can be finely adjusted.

Next, details of the cleaning roll 3 will be explained with reference to FIGS. 4 and 5.

The roll 3 is rotatably supported between a rotational transmission unit 14 and a liquid supply unit 15 by a rotational transmission shaft 16 passing through the roll 3, and the rotational driving force of the motor 17 is transmitted to the roll 3 via the rotational transmission unit 14. The cleaning liquid is supplied into the roll 3 from the liquid supply unit 15.

FIG. 5 (A> shows an example of the cleaning roll 3. In this example, the rotation transmission shaft 16 and the abrasion surface 18 are integrated so that they can rotate simultaneously. A large number of holes 19 are provided in the radial direction, so that the cleaning liquid can ooze out or jet out from the holes 19 through the abrasion surface 18.

FIG. 5(B) shows the other side of the cleaning roll 3. In this case, the cleaning roll tube 2° is fixed within the rotation transmission shaft 16 with an appropriate gap provided in the length direction of the shaft 1G. The cleaning roll pipe 2o has a cleaning liquid outflow hole 21 that opens toward the r cloth surface. This hole 21 may be one or more slit holes. Although not shown, the rotational power transmission shaft 16 is formed with a cleaning fluid inlet, and the cleaning fluid supplied from the hole 21 passes through the inlet of the power transmission shaft 16 and oozes or is ejected from the rubbing surface 18 onto the cloth 2.

The abrasive surface 18 may be made by planting brushes on the rotary transmission shaft 16 or by integrating an elastic sponge, or any other suitable abrasive material may be used.

Further, as shown in FIGS. 2 and 3, after cleaning with the roll 3, high-pressure jet water may be applied to the r cloth 2 for cleaning, and in this case, the liquid stop plate 11 is not required. In addition, care must be taken to prevent the high-pressure jet water from mixing with the reflux cleaning liquid.

Furthermore, in FIG. 4, 22 is a roll cover, which prevents the cleaning liquid from scattering during cleaning.

〔Effect of the invention〕

According to the method and apparatus of the present invention described above, it is possible to obtain the following effective effects.

+11 After the dewatering operation is completed, when cleaning the r-cloth from which the solid content on the surface of the r-cloth has been peeled off and removed, by a chemical method, select and use a cleaning liquid depending on the content of the chemical substance that is mixed into the sludge and circulates around it. I can do it.

(2) f The rotational speed of the cleaning roll can be selected depending on the soiled state of the cloth, and cleaning can be performed using dynamic rubbing force.

+3) By utilizing the rotation of the cleaning roll and r-cloth running function, various rubbing forces can be obtained, and the cleaning process time can be further shortened.

(4) It is possible to manage cleaning liquid (PH adjustment, supply liquid amount, maintenance of supply pressure, removal of generated sludge) and cleaning power.

(5)? Chemical cleaning can be performed continuously without removing the cloth, and the device of the present invention can be installed in both existing and newly installed dehydrators.

(6) Resources can be saved by circulating and reusing the cleaning liquid.

(7) Cleaning management can be fully automated, making maintenance and inspection of the entire device easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic front view of the whole, Fig. 2 is a side view of the main part, Fig. 3 is an enlarged front view of the main part, and Fig. 4 is an enlarged front view of the main part. An enlarged side view showing the cleaning roll installed state, and FIGS. 5(A) and 5(B) are sectional views of the roll, respectively. 2 is r cloth, 3 is cleaning roll, 4 is liquid tank, 6.1° is pipe,
9 is a liquid receiving tank, 16 is a rotating transmission shaft, and 18 is a friction surface. Agent Patent Attorney Product 1) Akira Tadashi Figure 1 ↓ Figure 2 Figure 3 G7r! September 1, 1980 Patent Application No. 144039 3, Relationship with the case of the person making the amendment Patent Applicant Address 2-17-15 Tsukuda, Chuo-ku, Tokyo Name
Tsukishima Kikai Co., Ltd. Representative: Gyoji Kuroboard 4, Agent Address: 105 Phone: 03-501-3633 Address: 2-5-8-6 Nishi-Shinbashi, Minato-ku, Tokyo Subject of amendment (1) “2” in the description , Scope of Claims” column. (2) Section 13 of the specification, “Detailed description of the invention”. 7. Contents of amendment (11. Claims are amended as shown in the attached sheet. (2) "Residual sludge" on page 1, line 17 of the specification is amended to read "chemical deposit on residue". (3) ) “Residue sludge” from line 4 to line 5 on page 2 of the same book is “
"Leftover pickles" is corrected. (4) ``Sludge that sticks'' in line 5 on the same page of the same book is corrected to ``chemical deposit that sticks.'' (5) "Chemical substance" in line 18 of the same page of the same book is corrected to "chemical reaction product." (6) From page 3, line 10 to line 11 of the same book, ``rotate in the opposite direction'' is corrected to ``rotate 14 times in the opposite direction''. (7) Correct "rPH value" on page 5, line 14 of the same book, to "1 that PH value".゛(8) ``New cleaning liquid'' in line 15 of the same page of the same book is corrected to ``new replenishment cleaning liquid.'' (9) On page 6 of the same book, line 6, ``Rotate backwards'' should be corrected to ``Rotate so that a retrograde effect occurs.'' 00) The lines from line 11 of the same book, page 1, “Also...” to line 15, line 15 of the same book, “It is now possible to...” are corrected as follows. In addition, the rotational speed of each roll 3 may be the same speed or different speeds, and each roll is rotated in the direction of running of the r fabric, and the running speed of the r fabric and the circumferential speed of each roll are Adjust and
By providing the appropriate speed difference, a dynamic rubbing force may be generated that opposes the running of the r-cloth. These are matters that can be determined arbitrarily. Further, the relative positional relationship between the rolls 3 can be adjusted by means of the interaxial support 13, and the clamping pressure on the two surfaces of the r cloth can be finely adjusted. 2. Claims (1) A pair of cleaning rolls 3 sandwiching the f cloth 2 are replaced by the r cloth 2.
A method for cleaning a filter cloth in a dehydrator, characterized in that two surfaces of the filter cloth are rubbed while a chemical cleaning solution is exuded or spouted out while rotating, and the cleaning solution is refluxed so that it can be reused. . (2) A dehydrator comprising a pair of cleaning rolls 3 which have a cleaning liquid supply port and have a rubbing surface 17 from which the cleaning liquid oozes or spouts out, and are rotatable with r cloth 2 sandwiched therebetween. Filter cloth cleaning device.

Claims (2)

[Claims] (1) A pair of cleaning rolls 3 sandwiching the filter cloth 2 are
A filter cloth cleaning method for a dehydrator, characterized in that the filter cloth is rotated in a direction opposite to the running direction of the filter cloth to rub two surfaces of the filter cloth while exuding or spouting a chemical cleaning solution, and the cleaning solution is refluxed so that it can be reused. (2) A dehydrator comprising a pair of cleaning rolls 3 which have a cleaning liquid supply port and have a rubbing surface 17 from which the cleaning liquid oozes or spouts out, and are rotatable with a filter cloth 2 sandwiched therebetween. Filter cloth cleaning device.