CN113262562A - Negative pressure filtering system and filtering process - Google Patents
Negative pressure filtering system and filtering process Download PDFInfo
- Publication number
- CN113262562A CN113262562A CN202110544522.8A CN202110544522A CN113262562A CN 113262562 A CN113262562 A CN 113262562A CN 202110544522 A CN202110544522 A CN 202110544522A CN 113262562 A CN113262562 A CN 113262562A
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- valve
- negative pressure
- filter
- liquid
- tank
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- 238000001914 filtration Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 16
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000002893 slag Substances 0.000 claims abstract description 56
- 238000011085 pressure filtration Methods 0.000 claims abstract description 6
- 239000011550 stock solution Substances 0.000 claims description 36
- 239000000706 filtrate Substances 0.000 claims description 33
- 238000005070 sampling Methods 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 13
- 238000010992 reflux Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
- B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
- B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/20—Pressure-related systems for filters
- B01D2201/204—Systems for applying vacuum to filters
- B01D2201/206—Systems for applying vacuum to filters by the weight of the liquid in a tube, e.g. siphon, barometric leg
Abstract
The invention discloses a negative pressure filtration system and a filtration process thereof, and the negative pressure filtration system comprises a raw liquid pool, a negative pressure tank, a head tank and a dry slag filter, wherein the raw liquid pool is communicated with the head tank through a raw liquid pump, the head tank is communicated with the dry slag filter through a feed pipe, the dry slag filter is connected with an emptying valve, a volume emptying valve, a liquid discharge air inlet valve and a slag discharge valve, the dry slag filter is communicated with the negative pressure tank through a liquid discharge pipe and a discharge pipe, the discharge pipe is connected with a clear liquid branch valve, the negative pressure tank is connected with a back blow air inlet valve, a clear liquid valve and a negative pressure pump, and the negative pressure tank is communicated with the raw liquid pool through a return valve. According to the invention, through changing the structure of the traditional filter, the suction force is generated on the liquid after the filter by using the negative pressure, the service life of the equipment is prevented from being shortened due to high pressure, and the cost is saved.
Description
Technical Field
The invention belongs to the field of filter systems, and particularly relates to a negative pressure filter system and a filter process.
Background
Most of the existing dry slag filtering processes are positive pressure filtering, and as a result, the internal pressure of the system is overlarge, the requirement on accessories is overhigh, the service life of the system is greatly shortened, and secondly, the air consumption in the dehydration process is large and the energy consumption is high.
Disclosure of Invention
The invention aims to provide a negative pressure filtering system and a filtering process, which have the advantages that the operation energy consumption and the cost of the whole filtering system are lower and the requirements on accessories are low through the improvement of the negative pressure filtering system and the process.
In order to solve the problems in the prior art, the invention adopts the technical scheme that:
a negative pressure filtration system comprises a stock solution pool, a negative pressure tank, a head tank and a dry slag filter.
The stock solution pond is communicated with the elevated tank through a stock solution pump, and the elevated tank is communicated with the dry slag filter through a feeding pipe.
The dry slag filter is connected with a liquid inlet valve, an emptying valve, a volume emptying valve, a liquid discharge air inlet valve and a slag discharge valve, the dry slag filter is communicated with the negative pressure tank through a liquid discharge pipe and a discharge pipe, and the discharge pipe is connected with a clear liquid branch valve.
The negative pressure tank is connected with a back-blowing air inlet valve, a negative pressure valve, a clear liquid valve and a negative pressure pump, and is communicated with the stock solution pool through a return valve.
Through the change to traditional filter structure, utilize the negative pressure to produce the suction to the liquid behind the filter, avoid shortening equipment life-span because the high pressure reduces the gas consumption, practices thrift the cost.
Furthermore, the elevated tank is communicated with the stock solution tank through a return pipe, the elevated tank is communicated with the stock solution tank, and because the stock solution pump works all the time, when the liquid inlet valve is closed, liquid can flow back to the stock solution tank through the return pipe, so that the normal use of the elevated tank is ensured.
Furthermore, the dry slag filter is a surface filter, and compared with a traditional filter, the surface filter is provided with filtrate in an upward-flowing mode, so that the interior of the filter is convenient to clean.
Furthermore, the liquid discharge pipe is communicated with the discharge pipe through a three-way pipe, the other end of the three-way pipe is connected with a sampling pipe, and the sampling pipe is connected with a sampling valve.
Furthermore, the slag discharging valve is arranged at the bottom end of the dry slag filter, and a slag pool is arranged at the lower side of the slag discharging valve.
Further, the head tank is higher than the dry slag filter.
A negative pressure filtering process of a dry slag filter comprises the following steps: step S1, filtering the stock solution; step S2, refluxing the turbid liquid; step S3, sampling; step S4, clear solution extraction.
Through above step, not only can filter the stoste, can also be according to the collection of the liquid quality selectivity after filtering, guarantee that the clear liquid after retrieving accords with the standard.
Further, the method also comprises a step S5 of dehydrating; and step S6, emptying the root volume, and setting dehydration and emptying the root volume to ensure that the water content of the filter residue is lower and the filter residue is convenient to recycle.
Further, the method comprises a step S7 of removing slag, wherein dry slag on the filter membrane falls off from the filter element through back-blowing air inlet, and enters a slag tank through a slag discharge valve.
Further, the step S1 is specifically: starting the stock solution pump and the negative pressure pump, opening the liquid inlet valve, the clear liquid branch valve and the negative pressure valve, introducing the stock solution into the dry residue filter for filtering to obtain filtrate a, and sucking the filtered solution into the negative pressure tank.
Further, the step S2 is specifically: and opening the reflux valve, and returning the filtered filtrate a from the negative pressure tank to the stock solution tank.
Further, the step S3 is specifically: opening a sampling valve to sample and detect the filtrate a; when the filtrate a does not meet the filtering standard, judging the filtrate a to be turbid liquid, and continuing to execute the step S2; when the filtrate a satisfies the filtering criterion, it is determined that the filtrate a is a clear liquid, and step S4 is performed. Through detecting filtrate a, guarantee that the filtrate a of retrieving can accord with the collection standard.
Further, the step S4 is specifically: the step S4 specifically includes: and closing the reflux valve, opening the clear liquid valve and collecting the filtrate a meeting the requirements.
Further, the step S5 is specifically: and after the equipment operates to the set pressure, closing the liquid inlet valve, opening the liquid discharge air inlet valve, and drying and dehydrating the filter element surface filter residue.
Further, the step S6 specifically includes: and closing the clear liquid valve, opening the emptying valve and the volume emptying valve, emptying the liquid at the root of the equipment, and discharging the liquid at the root of the dry slag filter out of the equipment through the emptying valve and the volume emptying valve.
Further, the step S7 specifically includes: closing the negative pressure valve, the emptying valve and the volume emptying valve, opening the back-blowing air inlet valve and the slag discharging valve, performing back-blowing on filter residues on the surface of the filter membrane to remove cakes, blowing the filter residues down from the filter element and discharging the filter residues into a slag pool through the slag discharging valve.
The invention has the beneficial effects that:
(1) according to the invention, through changing the structure of the traditional filter, the suction force is generated on the liquid after the filter by using the negative pressure, so that the air consumption in the dehydration process is reduced, the energy consumption is reduced, and the service life of equipment can be prevented from being shortened due to high pressure.
(2) According to the invention, the filtrate a flows back to the stock solution tank, so that the filtrate a can be repeatedly filtered, and the filtrate a obtained after multiple times of filtering meets the collection standard.
(3) By arranging the emptying valve and the volume emptying valve, the invention can completely discharge the liquid at the root of the dry slag filter out of the equipment, thereby reducing the water content of the discharged dry slag to the maximum extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic process diagram of the present invention.
In the figure: 1-a negative pressure tank; 2-stock solution pool; 3-elevated tank; 4-a slag pool; 5-a back-blowing air inlet valve; 6-clear liquid valve; 7-a negative pressure valve; 8-clear liquid branch valve; 9-a reflux valve; 10-a liquid inlet valve; 11-an evacuation valve; 12-a slag discharge valve; 13-volume evacuation valve; 14-a liquid discharge air inlet valve; 15-a sampling valve; 16-a stock solution pump; 17-a negative pressure pump; 18-dry residue filter.
Detailed Description
The invention will be further elucidated with reference to the drawings and reference numerals.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1:
as shown in figure 1, the negative pressure filtration system comprises a stock solution pool 2, a negative pressure tank 1, a head tank 3 and a dry residue filter 18.
The stock solution tank 2 is communicated with the elevated tank 3 through a stock solution pump 16, and the elevated tank 3 is communicated with a dry slag filter 18 through a feeding pipe.
The dry slag filter 18 is connected with a liquid inlet valve 10, an emptying valve 11, a volume emptying valve 13, a liquid discharge air inlet valve 14 and a slag discharge valve 12, the dry slag filter 18 is communicated with the negative pressure tank 1 through a liquid discharge pipe and a discharge pipe, and the discharge pipe is connected with a clear liquid branch valve 8.
The negative pressure tank 1 is connected with a back-blowing air inlet valve 5, a negative pressure valve 7, a clear liquid valve 6 and a negative pressure pump 17, and the negative pressure tank 1 is communicated with the stock solution tank 2 through a return valve 9.
Through the improvement of the negative pressure filtering system, the operation energy consumption and the cost of the whole filtering system are lower, and the requirement on accessories is low.
Example 2:
on the basis of the embodiment 1, the elevated tank 3 is communicated with the stock solution tank 2 through a return pipe, the elevated tank 3 is communicated with the stock solution tank 2, and as the stock solution pump 16 works all the time, when the liquid inlet valve 10 is closed, liquid can flow back to the stock solution tank 2 through the return pipe, so that the normal use of the elevated tank 3 is ensured.
The dry residue filter 18 is a surface filter, and compared with a traditional filter, filtrate is introduced into the surface filter, so that the interior of the dry residue filter 18 is convenient to clean.
The liquid discharge pipe is communicated with the material discharge pipe through a three-way pipe, the other end of the three-way pipe is connected with a sampling pipe, and the sampling pipe is connected with a sampling valve 15.
The slag discharging valve 12 is arranged at the bottom end of the dry slag filter 18, and a slag pool 4 is arranged at the lower side of the slag discharging valve 12.
The elevated tank 3 is higher than the dry slag filter 18.
Example 3:
on the basis of embodiment 2, as shown in fig. 2, the negative pressure filtering process of the dry slag filter comprises the following steps: step S1, filtering the stock solution; step S2, refluxing the turbid liquid; step S3, sampling; step S4, clear solution extraction.
Through above step, not only can filter the stoste, can also be according to the collection of the liquid quality selectivity after filtering, guarantee that the clear liquid after retrieving accords with the standard.
Example 4:
on the basis of the embodiment 3, the method further comprises the step of S5, dehydrating; step S6, the root volume is emptied. Through setting up dehydration and with the volume evacuation for the filter residue moisture content is lower, is convenient for recycle.
The step S1 specifically includes: starting a stock solution pump 16 and a negative pressure pump 17, starting a liquid inlet valve 10, a clear liquid branch valve 8 and a negative pressure valve 7, introducing the stock solution into a dry residue filter 18 for filtering to obtain a filtrate a, and sucking the filtered solution into a negative pressure tank 1.
The step S2 specifically includes: and opening a return valve 9, and returning the filtered filtrate a from the negative pressure tank 1 to the stock solution tank 2.
The step S3 specifically includes: opening a sampling valve 15, and sampling and detecting the filtrate a; when the filtrate a does not meet the filtering standard, judging the filtrate a to be turbid liquid, and continuing to execute the step S2; when the filtrate a satisfies the filtering criterion, it is determined that the filtrate a is a clear liquid, and step S4 is performed. Through detecting filtrate a, guarantee that the filtrate a of retrieving can accord with the collection standard.
The step S4 specifically includes: the step S4 specifically includes: and closing the reflux valve 9, opening the clear liquid valve 6 and collecting the filtrate a meeting the requirements.
The step S5 specifically includes: after the equipment operates to the set pressure, the liquid inlet valve 10 is closed, the liquid discharge air inlet valve 14 is opened, and filter residues on the surface of the filter element are dried and dehydrated.
The step S6 specifically includes: and (3) closing the clear liquid valve 6, opening the emptying valve 11 and the volume emptying valve 13, emptying the liquid at the root of the equipment, and discharging the liquid at the root of the dry slag filter 18 out of the equipment through the emptying valve 11 and the volume emptying valve 13.
Example 5:
in addition to the embodiment 4, the method further comprises a step S7 of deslagging the dry slag filter 18.
The step S7 specifically includes: closing the negative pressure valve 7, the emptying valve 11 and the volume emptying valve 13, opening the back-blowing air inlet valve 5 and the slag discharging valve 12, performing back-blowing on filter residues on the surface of the filter membrane to remove cakes, blowing the filter residues down from the filter element and discharging the filter residues into the slag pool 4 through the slag discharging valve 12.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. A negative pressure filtration system, comprising: comprises a stock solution pool (2), a negative pressure tank (1), a head tank (3) and a dry slag filter (18);
the stock solution pool (2) is communicated with the elevated tank (3) through a stock solution pump (16), and the elevated tank (3) is communicated with the dry slag filter (18) through a feeding pipe;
the dry slag filter (18) is connected with a liquid inlet valve (10), an emptying valve (11), a volume emptying valve (13), a liquid discharge air inlet valve (14) and a slag discharge valve (12), the dry slag filter (18) is communicated with the negative pressure tank (1) through a liquid discharge pipe and a discharge pipe, and the discharge pipe is connected with a clear liquid branch valve (8);
the negative pressure tank (1) is connected with a back-flushing air inlet valve (5), a clear liquid valve (6), a negative pressure valve (7) and a negative pressure pump (17), and the negative pressure tank (1) is communicated with the stock solution pool (2) through a return valve (9);
the elevated tank (3) is communicated with the stock solution pool (2) through a return pipe, the liquid discharge pipe is communicated with the discharge pipe through a three-way pipe, the other end of the three-way pipe is connected with a sampling pipe, and the sampling pipe is connected with a sampling valve (15).
2. The filtration process based on the negative pressure filtration system of claim 1, wherein: the method comprises the following steps:
step S1, filtering the stock solution;
step S2, refluxing the turbid liquid;
step S3, sampling;
step S4, clear solution extraction.
3. The filtration process of claim 2, wherein: further comprising a step S5 of dehydrating; step S6, emptying root volume; and step S7, deslagging the dry slag filter (18).
4. The filtration process of claim 3, wherein: the step S1 specifically includes: starting a stock solution pump (16) and a negative pressure pump (17), opening a liquid inlet valve (10), a clear liquid branch valve (8) and a negative pressure valve (7), introducing the stock solution into a dry residue filter (18) for filtering to obtain a filtrate a, and sucking the filtered solution into a negative pressure tank (1).
5. The filtration process of claim 4, wherein: the step S2 specifically includes: and (3) opening a reflux valve (9) and returning the filtered filtrate a to the stock solution tank (2) from the negative pressure tank (1).
6. The filtration process of claim 5, wherein: the step S3 specifically includes: opening a sampling valve (15) to sample and detect the filtrate a;
when the filtrate a does not meet the filtering standard, judging the filtrate a to be turbid liquid, and continuing to execute the step S2;
when the filtrate a satisfies the filtering criterion, it is determined that the filtrate a is a clear liquid, and step S4 is performed.
7. The filtration process of claim 6, wherein: the step S4 specifically includes: and closing the reflux valve (9) and opening the clear liquid valve (6) to collect the filtrate a meeting the requirements.
8. The filtration process of claim 7, wherein: the step S5 specifically includes: and (3) closing the liquid inlet valve (10), opening the liquid discharge air inlet valve (14), and drying and dehydrating filter residues on the surface of the filter element.
9. The filtration process of claim 8, wherein: the step S6 specifically includes: and closing the clear liquid valve (6), opening the emptying valve (11) and the volume emptying valve (13), emptying the liquid at the root part of the dry slag filter (18), and discharging the liquid at the root part of the dry slag filter (18) through the emptying valve (11) and the volume emptying valve (13).
10. The filtration process of claim 9, wherein: the step S7 specifically includes: closing the negative pressure valve (7), the emptying valve (11) and the volume emptying valve (13), opening the back-blowing air inlet valve (5) and the slag discharging valve (12), back-blowing filter residues on the surface of the filter membrane to remove the filter residues, blowing the filter residues down from the filter core and discharging the filter residues into the slag pool (4) through the slag discharging valve (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110544522.8A CN113262562A (en) | 2021-05-19 | 2021-05-19 | Negative pressure filtering system and filtering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110544522.8A CN113262562A (en) | 2021-05-19 | 2021-05-19 | Negative pressure filtering system and filtering process |
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| Publication Number | Publication Date |
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| CN113262562A true CN113262562A (en) | 2021-08-17 |
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| CN202110544522.8A Pending CN113262562A (en) | 2021-05-19 | 2021-05-19 | Negative pressure filtering system and filtering process |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202028256U (en) * | 2011-01-12 | 2011-11-09 | 广州千松科技有限公司 | Vacuum ceramics filter system |
| CN102583698A (en) * | 2012-04-01 | 2012-07-18 | 南京大学 | Oxidation-adsorption integral arsenic removal device and method for drinking water |
| CN102963973A (en) * | 2012-12-10 | 2013-03-13 | 同济大学 | Method for purifying raw water by using biologically-enhanced diatomite-dynamic membrane ultrafiltration-supported separation process |
| CN207877884U (en) * | 2018-01-27 | 2018-09-18 | 王延军 | A kind of filtering and purifying of electrolyte |
| CN210079089U (en) * | 2019-05-17 | 2020-02-18 | 辛集市银叶纸品有限公司 | Filter of die-cutting machine |
| CN211586039U (en) * | 2019-12-23 | 2020-09-29 | 珠海华彩新材料科技有限公司 | Negative pressure filter equipment |
-
2021
- 2021-05-19 CN CN202110544522.8A patent/CN113262562A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202028256U (en) * | 2011-01-12 | 2011-11-09 | 广州千松科技有限公司 | Vacuum ceramics filter system |
| CN102583698A (en) * | 2012-04-01 | 2012-07-18 | 南京大学 | Oxidation-adsorption integral arsenic removal device and method for drinking water |
| CN102963973A (en) * | 2012-12-10 | 2013-03-13 | 同济大学 | Method for purifying raw water by using biologically-enhanced diatomite-dynamic membrane ultrafiltration-supported separation process |
| CN207877884U (en) * | 2018-01-27 | 2018-09-18 | 王延军 | A kind of filtering and purifying of electrolyte |
| CN210079089U (en) * | 2019-05-17 | 2020-02-18 | 辛集市银叶纸品有限公司 | Filter of die-cutting machine |
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Application publication date: 20210817 |