CN112845095A - Stock domestic waste 3D selects separately system - Google Patents
Stock domestic waste 3D selects separately system Download PDFInfo
- Publication number
- CN112845095A CN112845095A CN202110238452.3A CN202110238452A CN112845095A CN 112845095 A CN112845095 A CN 112845095A CN 202110238452 A CN202110238452 A CN 202110238452A CN 112845095 A CN112845095 A CN 112845095A
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- Prior art keywords
- screen
- discharge port
- sieve
- butterfly
- conveyer belt
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- 239000010791 domestic waste Substances 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 165
- 239000002689 soil Substances 0.000 claims description 18
- 238000000926 separation method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/06—Feeding or discharging arrangements
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明提出一种存量生活垃圾3D分选系统，包括有进料输送带、第一弹跳筛、第二弹跳筛、滚筒筛和蝶式筛。第一弹跳筛包括有第一筛上物出料口、第一筛下物出料口和第一重物质出料口，第二弹跳筛包括有第二筛上物出料口、第二筛下物出料口和第二重物质出料口，滚筒筛包括有滚筒筛上物出料口和滚筒筛下物出料口，蝶式筛包括有蝶式筛上物出料口和蝶式筛下物出料口。第一弹跳筛对存量生活垃圾进行一次分选，第二弹跳筛对一次分选料进行二次分选，滚筒筛对二次分选料进行分选，蝶式筛以滚筒筛的筛上物作为物料进行细化分选。本发明具有布局简单合理、占地面积小、运行成本低和分选效率高的特点。
The invention proposes a 3D sorting system for stock domestic garbage, which includes a feeding conveyor belt, a first bouncing screen, a second bouncing screen, a drum screen and a butterfly screen. The first bouncing screen includes the discharge port for the first sieve material, the discharge port for the first screen material and the first heavy material discharge port, and the second bouncing screen includes the discharge port for the second screen material and the second screen. The lower material discharge port and the second heavy material discharge port, the trommel screen includes a trommel screen upper material discharge port and a trommel screen lower material discharge port, and the butterfly screen includes a butterfly screen upper material discharge port and a butterfly type discharge port. The sieve material discharge port. The first bouncing screen sorts the stock domestic waste once, the second bouncing screen sorts the primary sorting material twice, the trommel screen sorts the secondary sorting material, and the butterfly screen uses the trommel screen to screen the material. As a material for fine sorting. The invention has the characteristics of simple and reasonable layout, small footprint, low operating cost and high sorting efficiency.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a system for sorting and harmlessly treating stored household garbage.
Background
The Chinese patent with the application number of 201621461424.9 provides a combined sorting system for the stored domestic garbage, which jointly sorts the stored garbage through a drum screen, a vibrating screen and a plurality of air separation machines, so as to sort the stored garbage into combustible materials, non-combustible materials and fine soil.
Disclosure of Invention
The invention aims to provide a 3D sorting system for household garbage stocks, which can efficiently, quickly and accurately sort the household garbage stocks and has the characteristics of simple and reasonable layout, small occupied area, low operation cost and high sorting efficiency.
The purpose of the invention can be realized by the following technical scheme:
A3D sorting system for the stored household garbage comprises a feeding conveying belt, a first bouncing sieve, a second bouncing sieve, a rotary sieve and a butterfly sieve; the first bouncing sieve comprises a first oversize material outlet, a first undersize material outlet and a first heavy material outlet, a first oversize material conveyer belt is arranged below the first oversize material outlet, a first undersize material conveyer belt is arranged below the first undersize material outlet, a first heavy material conveyer belt is arranged below the first heavy material outlet, and the tail end of the feed conveyer belt is positioned above the feed end of the first bouncing sieve; the second bounce screen comprises a second oversize material discharge port, a second undersize material discharge port and a second heavy material discharge port, a second oversize material conveyer belt is arranged below the second oversize material discharge port, a second undersize material conveyer belt is arranged below the second undersize material discharge port, a second heavy material conveyer belt is arranged below the second heavy material discharge port, and the tail end of the first undersize material conveyer belt of the first bounce screen is positioned above the feed end of the second bounce screen; the rotary screen comprises a rotary screen upper material discharge port and a rotary screen lower material discharge port, a rotary screen upper material conveying belt is arranged below the rotary screen upper material discharge port, a rotary screen lower material conveying belt is arranged below the rotary screen lower material discharge port, and the tail end of a second lower material conveying belt of the second bounce screen is positioned above the feed end of the rotary screen; the butterfly sieve comprises a butterfly sieve upper material discharge port and a butterfly sieve lower material discharge port, a butterfly sieve upper material conveying belt is arranged below the butterfly sieve upper material discharge port, a butterfly sieve lower material conveying belt is arranged below the butterfly sieve lower material discharge port, and the tail end of a drum sieve upper material conveying belt of the drum sieve is positioned above the feed end of the butterfly sieve.
Preferably, the 3D sorting system for the household garbage in stock further comprises an even feeder, and the discharge end of the even feeder is positioned below the front end of the feeding conveyer belt.
Preferably, the 3D sorting system for the stored domestic garbage further comprises a combustible collecting conveyor belt, and the tail end of the first oversize product conveyor belt, the tail end of the second oversize product conveyor belt and the tail end of the butterfly type oversize product conveyor belt are located above the combustible collecting conveyor belt.
Preferably, the 3D sorting system for the household garbage inventory further comprises a packer, and the feeding end of the packer is positioned below the tail end of the combustible gathering conveyor belt.
Preferably, the 3D sorting system for the stored domestic garbage further comprises a fine soil gathering conveyor belt, and a drum undersize output belt and a butterfly undersize output belt, the ends of which are respectively located above the fine soil gathering conveyor belt, the end of the drum undersize conveyor belt is located above the drum undersize output belt, and the end of the butterfly undersize conveyor belt is located above the butterfly undersize output belt.
In the invention, the sieve plate of the first bounce sieve can be a bar-shaped sieve plate, namely, the sieve holes on the sieve plate are arranged in a strip shape, and the length of the strip-shaped sieve hole is 300-800 mm, and the width of the strip-shaped sieve hole is 40-60 mm. The sieve plate of the second bounce sieve can adopt a round hole sieve plate, namely, the sieve holes on the sieve plate are circularly arranged, and the diameter of each round sieve hole is 30-50 mm. The diameter of the screen hole on the roller screen can be set to be 20-40 mm. The butterfly sieve is also called butterfly sieve, and the gap between the upper sieve plates can be 5-10 mm.
The invention has the following prominent substantive features and remarkable progress: the progressive sorting configuration of twice bounce screening, drum screening and disc screening is adopted, the stored household garbage is sorted into combustible materials, non-combustible materials and fine soil, and the progressive sorting configuration has the characteristics of high sorting efficiency, short time consumption and low operation cost; meanwhile, the fine separation step of re-scattering oversize products of the drum screen is realized by adding the butterfly screen, and the fine soil separation method has the characteristic of thorough fine soil separation.
Drawings
Fig. 1 is a schematic structural view of the components of the present invention.
FIG. 2 is a schematic diagram of the structure of a bouncing screen of the present invention.
Fig. 3 is a schematic structural view of the drum screen and the disc screen sorting according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Examples
Referring to fig. 1, a 3D sorting system for household garbage storage comprises a uniform feeder 1, a feeding conveyer belt 11, a first bounce screen 2, a second bounce screen 3, a drum screen 4, a butterfly screen 5, a packer 6, a combustible collecting conveyer belt 91 and a fine soil collecting conveyer belt 92.
The household garbage stock enters the uniform feeder 1, the discharge end of the uniform feeder is positioned below the front end of the feeding conveyer belt 11, and the tail end of the feeding conveyer belt 11 is positioned above the feed end of the first bounce screen 2. The first bouncing sieve 2 comprises a first oversize material outlet 21, a first undersize material outlet 22 and a first heavy material outlet 23, a first oversize material conveyer belt 211 is arranged below the first oversize material outlet 21, a first undersize material conveyer belt 221 is arranged below the first undersize material outlet 22, a first heavy material conveyer belt 231 is arranged below the first heavy material outlet 23, and heavy materials discharged from the first heavy material outlet 23 are transversely output and then stored as non-combustible materials.
The end of the first undersize conveyor belt 221 of the first bounce screen 2 is located above the feed end of the second bounce screen 3. The second bounce screen 3 comprises a second oversize material outlet 31, a second undersize material outlet 32 and a second heavy material outlet 33, a second oversize material conveyer belt 311 is arranged below the second oversize material outlet 31, a second undersize material conveyer belt 321 is arranged below the second undersize material outlet 32, a second heavy material conveyer belt 331 is arranged below the second heavy material outlet 33, and heavy materials discharged from the second heavy material outlet 33 are transversely output and then stored as non-combustible materials.
The end of the second undersize conveyor belt 321 of the second bounce screen 3 is located above the feed end of the trommel 4. The drum sieve 4 comprises a drum sieve upper material outlet 41 and a drum sieve lower material outlet 42, a drum sieve upper material conveyer belt 411 is arranged below the drum sieve upper material outlet 41, and a drum sieve lower material conveyer belt 421 is arranged below the drum sieve lower material outlet 42.
The end of the trommel conveyor 411 of the trommel 4 is located above the feed end of the butterfly screen 5. The butterfly screen 5 comprises a butterfly screen upper material outlet 51 and a butterfly screen lower material outlet 52, a butterfly screen upper material conveyer belt 511 is arranged below the butterfly screen upper material outlet 51, and a butterfly screen lower material conveyer belt 521 is arranged below the butterfly screen lower material outlet 52.
The tail end of the first oversize product conveyer belt 211, the tail end of the second oversize product conveyer belt 311 and the tail end of the butterfly oversize product conveyer belt 511 are positioned above the combustible collecting conveyer belt 91, the lower part of the tail end of the combustible collecting conveyer belt 91 is connected with the feeding end of the packing machine 6, and combustible is output and packed by the packing machine 6. The end of the roller undersize conveyer belt 421 is positioned above the roller undersize output belt 422, the end of the butterfly undersize conveyer belt 521 is positioned above the butterfly undersize output belt 522, the end of the roller undersize output belt 422 and the end of the butterfly undersize output belt 522 are positioned above the fine soil gathering conveyer belt 92, and fine soil is output by the fine soil gathering conveyer belt 92.
In the 3D sorting system for the stored domestic garbage, the sieve plate of the first bounce sieve 2 is a bar-shaped sieve plate, that is, the sieve holes on the sieve plate are arranged in a long strip shape, and the length of the long strip-shaped sieve hole is specifically 500mm, and the width thereof is specifically 50 mm; the sieve plate of the second bounce sieve 3 adopts a round hole sieve plate, namely sieve holes on the sieve plate are circularly arranged, and the diameter of each round sieve hole is 40 mm; the diameter of the sieve holes on the drum sieve 4 is 35mm, and the butterfly sieve 5 is also called butterfly sieve, and the gap of the sieve tray on the butterfly sieve is 8 mm.
When the 3D sorting system for the stored domestic garbage operates, the stored domestic garbage is scattered by the uniform feeder 1, and then is sorted by the feeding conveyer belt 11 → the first bounce sieve 2, and the first bounce sieve 2 sorts the stored domestic garbage for one time according to the weight and the particle size, specifically as follows: (1) the heavy metal parts, construction waste and other large heavy materials in the stored household garbage are output from the first heavy material outlet 23 → the first heavy material conveyer belt 231 of the first bounce screen 2 and stored as non-combustible materials; (2) the lighter and larger large light substances in the household garbage are conveyed to the combustible collecting and conveying belt 91 as the combustible from the first oversize material outlet 21 → the first oversize material conveying belt 211 of the first bounce screen 2; (3) the matters with smaller particle size in the household garbage are output from the first undersize discharge port 22 → the first undersize conveyer belt 221 of the first bounce screen 2 and enter the second bounce screen 3 as a primary sorting material.
The second bounce screen 3 carries out secondary separation on the primary separated material according to the weight and the particle size, and separates out heavy materials, light materials and undersize materials from the primary separated material respectively, which is as follows: (1) the heavy materials are output from a second heavy material outlet 33 → a second heavy material conveying belt 331 of the second bounce screen 3 and are stored as non-combustible materials; (2) the light substances are conveyed to the combustible collecting and conveying belt 91 as the combustible through a second oversize material outlet 31 → a second oversize material conveying belt 311 of the second bounce screen 3; (3) the undersize is output from the second undersize discharge port 32 → the second undersize conveyor belt 321 of the second bounce screen 3 and enters the drum screen 4 as the secondary sorted material.
The drum screen 4 sorts the secondary sorting materials according to the particle size, and the fine materials of the secondary sorting materials are output from the drum screen underflow discharge port 42 → the drum screen underflow conveyer belt 421 → the drum screen underflow output belt 422 and are conveyed to the fine soil collecting conveyer belt 92 as fine soil; oversize products of secondary sorting materials are sorted through a roller oversize product discharge port 41 → a roller oversize product conveyer belt 411 → the butterfly screen 5.
The butterfly type screen 5 uses oversize materials of the rotary screen 4 as materials to carry out refining separation, and in the process that the screen disc of the butterfly type screen 5 pushes the materials to move, the screen disc can break up fine materials attached in the materials, so that the fine materials are output from a butterfly type undersize material discharge port 52 → a butterfly type undersize material conveying belt 521 → a butterfly type undersize material output belt 522 and are conveyed to a fine soil collecting conveying belt 92 as fine soil, and coarse materials in the materials are conveyed to a butterfly type oversize material conveying belt 511 as combustible materials and are conveyed to a combustible material collecting conveying belt 91.
The combustible collecting conveyer belt 91 collects the combustible discharged from the first oversize conveyer belt 211, the second oversize conveyer belt 311 and the butterfly oversize conveyer belt 511 → the baler 6 reaches regenerated combustible.
The fine soil gathering conveyor belt 92 gathers the fine soil output by the roller undersize output belt 422 and the butterfly undersize output belt 522 for centralized storage or output.
Claims (5)
1. A3D sorting system for the stored household garbage is characterized by comprising a feeding conveyer belt, a first bouncing sieve, a second bouncing sieve, a rotary sieve and a butterfly sieve;
the first bouncing sieve comprises a first oversize material outlet, a first undersize material outlet and a first heavy material outlet, a first oversize material conveyer belt is arranged below the first oversize material outlet, a first undersize material conveyer belt is arranged below the first undersize material outlet, a first heavy material conveyer belt is arranged below the first heavy material outlet, and the tail end of the feed conveyer belt is positioned above the feed end of the first bouncing sieve;
the second bounce screen comprises a second oversize material discharge port, a second undersize material discharge port and a second heavy material discharge port, a second oversize material conveyer belt is arranged below the second oversize material discharge port, a second undersize material conveyer belt is arranged below the second undersize material discharge port, a second heavy material conveyer belt is arranged below the second heavy material discharge port, and the tail end of the first undersize material conveyer belt of the first bounce screen is positioned above the feed end of the second bounce screen;
the rotary screen comprises a rotary screen upper material discharge port and a rotary screen lower material discharge port, a rotary screen upper material conveying belt is arranged below the rotary screen upper material discharge port, a rotary screen lower material conveying belt is arranged below the rotary screen lower material discharge port, and the tail end of a second lower material conveying belt of the second bounce screen is positioned above the feed end of the rotary screen;
the butterfly sieve comprises a butterfly sieve upper material discharge port and a butterfly sieve lower material discharge port, a butterfly sieve upper material conveying belt is arranged below the butterfly sieve upper material discharge port, a butterfly sieve lower material conveying belt is arranged below the butterfly sieve lower material discharge port, and the tail end of a drum sieve upper material conveying belt of the drum sieve is positioned above the feed end of the butterfly sieve.
2. The inventory domestic waste 3D sorting system of claim 1, wherein: the automatic feeding device is characterized by further comprising an even feeder, wherein the discharge end of the even feeder is positioned below the front end of the feeding conveying belt.
3. The inventory domestic waste 3D sorting system of claim 1, wherein: the combustible material collecting and conveying device further comprises a combustible material collecting and conveying belt, wherein the tail end of the first oversize material conveying belt, the tail end of the second oversize material conveying belt and the tail end of the butterfly type oversize material conveying belt are located above the combustible material collecting and conveying belt.
4. The inventory domestic waste 3D sorting system of claim 3, wherein: the combustible material collecting conveyer belt is characterized by further comprising a packer, wherein the feeding end of the packer is located below the tail end of the combustible material collecting conveyer belt.
5. The inventory domestic waste 3D sorting system of claim 1, wherein: the device also comprises a fine soil gathering conveyer belt, a roller undersize output belt and a butterfly undersize output belt, wherein the tail ends of the roller undersize conveyer belt are respectively positioned above the fine soil gathering conveyer belt, the tail ends of the roller undersize conveyer belt are positioned above the roller undersize output belt, and the tail ends of the butterfly undersize conveyer belt are positioned above the butterfly undersize output belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238452.3A CN112845095A (en) | 2021-03-04 | 2021-03-04 | Stock domestic waste 3D selects separately system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238452.3A CN112845095A (en) | 2021-03-04 | 2021-03-04 | Stock domestic waste 3D selects separately system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112845095A true CN112845095A (en) | 2021-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110238452.3A Pending CN112845095A (en) | 2021-03-04 | 2021-03-04 | Stock domestic waste 3D selects separately system |
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| Country | Link |
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| CN (1) | CN112845095A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433483A (en) * | 2021-12-22 | 2022-05-06 | 苏州鲁博环保设备有限公司 | Stale refuse screening process |
| CN114669479A (en) * | 2022-04-15 | 2022-06-28 | 广东亨益环保集团有限公司 | Two-stage roller sorting rear-mounted sorting process for stock household garbage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201684656U (en) * | 2010-04-12 | 2010-12-29 | 梅塞尔斯(北京)环保设备有限公司 | Separation equipment system for municipal domestic waste |
| CN107262490A (en) * | 2016-04-08 | 2017-10-20 | 深圳华云环保科技发展有限公司 | Comprehensive treating system for life garbage and technique |
| DE102019104050A1 (en) * | 2019-02-18 | 2020-08-20 | Günther Holding GmbH & Co. KG | Process and system for recovering a valuable material from municipal waste |
| CN211538923U (en) * | 2019-07-18 | 2020-09-22 | 广东亨益环保集团有限公司 | Household garbage deep sorting system |
| CN214638231U (en) * | 2021-03-04 | 2021-11-09 | 广东亨益环保集团有限公司 | A 3D sorting system for stock domestic waste |
-
2021
- 2021-03-04 CN CN202110238452.3A patent/CN112845095A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201684656U (en) * | 2010-04-12 | 2010-12-29 | 梅塞尔斯(北京)环保设备有限公司 | Separation equipment system for municipal domestic waste |
| CN107262490A (en) * | 2016-04-08 | 2017-10-20 | 深圳华云环保科技发展有限公司 | Comprehensive treating system for life garbage and technique |
| DE102019104050A1 (en) * | 2019-02-18 | 2020-08-20 | Günther Holding GmbH & Co. KG | Process and system for recovering a valuable material from municipal waste |
| CN211538923U (en) * | 2019-07-18 | 2020-09-22 | 广东亨益环保集团有限公司 | Household garbage deep sorting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433483A (en) * | 2021-12-22 | 2022-05-06 | 苏州鲁博环保设备有限公司 | Stale refuse screening process |
| CN114669479A (en) * | 2022-04-15 | 2022-06-28 | 广东亨益环保集团有限公司 | Two-stage roller sorting rear-mounted sorting process for stock household garbage |
| CN114669479B (en) * | 2022-04-15 | 2023-10-10 | 广东亨益环保集团有限公司 | Post-sorting process for sorting stock household garbage by using secondary roller |
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