CN105253629B - Wave-pieced type dense-phase powder pumping system - Google Patents
Wave-pieced type dense-phase powder pumping system Download PDFInfo
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- CN105253629B CN105253629B CN201510638755.9A CN201510638755A CN105253629B CN 105253629 B CN105253629 B CN 105253629B CN 201510638755 A CN201510638755 A CN 201510638755A CN 105253629 B CN105253629 B CN 105253629B
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- lobe
- injector
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- tube
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- 239000000843 powder Substances 0.000 title claims abstract description 25
- 238000005086 pumping Methods 0.000 title claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000007664 blowing Methods 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 27
- 239000006200 vaporizer Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000005243 fluidization Methods 0.000 claims abstract description 8
- 230000000737 periodic effect Effects 0.000 claims abstract description 8
- 230000008676 import Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 26
- 239000007924 injection Substances 0.000 abstract description 26
- 239000000463 material Substances 0.000 abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 20
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 235000019738 Limestone Nutrition 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Air Transport Of Granular Materials (AREA)
Abstract
Wave-pieced type dense-phase powder pumping system, including Pneumatic conveyer, conveyance conduit and auxiliary blowing apparatus, Pneumatic conveyer includes the pump housing, pump housing bottom, which is set, sends ware vaporizer, the top for sending ware vaporizer sets fluid bed, its side and bottom are respectively arranged with fluidisation nitrogen tube and bottom blowing nitrogen tube, bottom blowing nitrogen tube, which is passed through, sends ware vaporizer, the upper end of fluid bed sets lobe injector, the top of lobe injector sets mixing tube, the upper end of mixing tube and one end sealing of conveying chute are fixed, the other end of conveying chute is protruded upward outside the pump housing, charging aperture is provided with the top of the pump housing, the side of charging aperture sets force feed nitrogen tube, lobe injector is periodic wave lobed shape, its lower end import to upper end outlet side wall is smooth excessiveness structure.Injector of the present invention has periodic wave valve structure, improves Gas Mixing in Cross flow and injection performance, and lobe injection improves injection than more than 4 times, and forms Condensed transportation, and conveying capacity increase reduces the splash pollution that material enters iron bag.
Description
Technical field
The present invention relates to a kind of granular material blowing system, belong to material transportation art, more particularly to it is a kind of by pulverized limestone
The wave-pieced type dense-phase powder pumping system for carrying out desulfurization in iron bag to molten steel is transported to by nitrogen.
Background technology
Material-handling pump is the visual plant in hot metal in steelmaking pretreatment KR method desulphurization production technologies, and its effect is by lime
Powder (CaO) by nitrogen injection, force feed, help to blow and be transported in iron bag, make the effective desulfurization of molten iron, meet production requirement.The pump shows
The ash transfer system such as cement, thermal power plant is widely used to, and traditional negative-pressure powder conveying equipment compares, material conveying
The conveying capacity of pump is strengthened, but then, and because its conveying capacity is relatively low, fed distance is short, and splash dust pollution is big,
Line clogging seriously waits and also constrains its development significantly.
A kind of open " the storehouse formula gas of Chinese patent (application number 201520027461.8, authorized announcement date on June 24th, 2015)
Power delivery pump structure ", it includes top in the pump housing, the pump housing and is provided with inlet valve, and its other end of the inlet valve is connected with electricity
Magnetic guiding valve, the outer upper right side of the pump housing is connected with exhaust apparatus, and the outer lower-left end of the pump housing is connected with material conveying pipe, in pump
The right of body is provided with branch gas bag, and the branch gas bag is connected by the forcing pipe of left upper end with the pump housing, in the branch gas bag
Between be provided with gas transmission pipeline, described its other end of gas transmission pipeline is connected with playpipe, the other end of the playpipe
Stretch into pump body.The delivery pump structure of the utility model is simple, cost is low, it is to avoid conveyance conduit clogging, solves
Geldart-D particle failure of pump.But still without solving existing delivery pump and system conveying capacity is relatively low, fed distance is shorter and splash
Heavy-polluted problem.
The content of the invention
The present invention provides a kind of wave-pieced type dense-phase powder pumping system, defeated for solving air-transport system in the prior art
The amount of sending is relatively low, fed distance is shorter and the heavy-polluted problem of splash, by setting lobe injector preferably to improve in the pump housing
Injection ratio, and then conveying capacity is greatly improved, while setting pulsed auxiliary blowing apparatus on conveyance conduit, it is to avoid conveyance conduit is blocked
With raising fed distance.
In order to realize the purpose of the present invention, using following technical scheme：
Wave-pieced type dense-phase powder pumping system, including Pneumatic conveyer, conveyance conduit and along conveyance conduit move towards peace
The auxiliary blowing apparatus of dress, the Pneumatic conveyer includes the pump housing, and pump housing bottom, which is set, sends ware vaporizer, sends ware vaporizer
Top sets fluid bed, and its side and bottom are respectively arranged with fluidisation nitrogen tube and bottom blowing nitrogen tube, and the bottom blowing nitrogen tube is worn
Cross and send ware vaporizer, the upper end of fluid bed sets lobe injector, the top of lobe injector sets mixing tube, mixing tube
Upper end and the sealing of one end of conveying chute are fixed, and the other end of conveying chute is protruded upward outside the pump housing, the top of the pump housing
Charging aperture is provided with, the side of charging aperture sets force feed nitrogen tube, and the lobe injector is periodic wave lobed shape, and its lower end is entered
The side wall of mouth to upper end outlet is smooth excessiveness structure.
The key point of the present invention, is that the through-type playpipe in raw material pumping installations is designed as into lobe playpipe,
Lobe injection is introduced in material pumping device in hot metal in steelmaking pre-treating process, gas is improved by periodic wave valve structure
Mixing capacity is flowed, strengthens injection performance, lobe injection improves injection than more than 4 times, the increase of injection powder material concentration, conveying capacity
Increase, forms Condensed transportation, after the powder material concentration increase of conveying and speed are improved, and material enters pressure increase during iron bag,
Make splash pollution reduction.In addition, the problem of bringing line clogging after Dense Phase Material Conveying, therefore along material on conveyance conduit
Move towards to set multiple auxiliary blowing apparatus, auxiliary blowing apparatus includes gas bag and playpipe, and playpipe is convergent-divergent channel structure, and is set outside
In sleeve pipe, gas bag is connected with outer tube, and pulse valve and solenoid pilot valve are installed in the upper end of outer tube and playpipe, to convergent-divergent channel
Interval is blown supersonic speed air pulse successively, it is possible to resolve pipeline accumulation and originally often help that blows to enter bag splash that concentrated phase material web comes
Problem, blows valve system and can more disturb strength transporting velocity, pressure field, the bank of strength evacuation accumulation has than originally often helping
Effect prevents putty, helps that to blow performance more superior.When the axis of convergent-divergent channel axis and conveyance conduit is into 0~35 ° of angle, to defeated
Send the anti-accumulated plugging of pipeline and splash pollution effects more preferable.
In order to further realize the purpose of the present invention, following technical scheme can also be used：
Wave-pieced type dense-phase powder pumping system as described above, the upper end outlet area of the lobe injector and lower end are entered
Open area is equal.
Wave-pieced type dense-phase powder pumping system as described above, the auxiliary blowing apparatus includes being provided with air inlet on gas bag, gas bag
Mouthful, its middle part sets vertical playpipe, and the outside of playpipe sets outer tube, and outer tube connect with gas bag, playpipe and outside
Sleeve pipe installs pulse valve and solenoid pilot valve in upper end；The outer tube is sealed with conveyance conduit and fixed, and the lower end of playpipe is stretched
Enter in delivery pipe.
Wave-pieced type dense-phase powder pumping system as described above, the playpipe is convergent-divergent channel, convergent-divergent channel axis with
The axis of conveyance conduit is into 0~35 ° of angle.
Wave-pieced type dense-phase powder pumping system as described above, the auxiliary blowing apparatus is provided with many along conveyance conduit trend
Individual, adjacent auxiliary blowing apparatus is set at intervals of 3~5m.
Beneficial effects of the present invention：
1st, lobe injection is introduced in the material pumping device in hot metal in steelmaking pre-treating process, passes through periodic wave
Valve structure improves Gas Mixing in Cross flow ability, strengthens injection performance, and lobe injection improves injection than more than 4 times, and injection powder material is dense
Degree increase, conveying capacity increase forms Condensed transportation, after the powder material concentration increase of conveying and speed are improved, material enters Tie Bao
When pressure increase, make splash pollution reduction.
2nd, move towards to set multiple auxiliary blowing apparatus along material on conveyance conduit, auxiliary blowing apparatus includes gas bag and playpipe, spray
Pipe is penetrated for convergent-divergent channel structure, and is arranged in outer tube, gas bag is connected with outer tube, the upper end of outer tube and playpipe is installed
Pulse valve and solenoid pilot valve, injection supersonic speed air pulse are spaced to convergent-divergent channel, it is possible to resolve what concentrated phase material web came successively
Pipeline is accumulated and originally often helps that blows to enter bag expulsion problem, than originally often help blow valve system can more disturb strength transporting velocity field,
Pressure field, the bank of strength evacuation accumulation, effectively prevents putty, helps that to blow performance more superior.Convergent-divergent channel axis and conveying
It is more preferable to the anti-accumulated plugging of conveyance conduit and splash pollution effects when the axis of pipeline is into 0~35 ° of angle.
3rd, pulverized limestone (CaO) will be transported to by iron Bao Neituo by nitrogen in molten iron pre-treating process by the present invention
Sulphur, can improve desulfurizing agent unit interval addition, KR each desulfurization 7~9 minutes pulverized limestone times of conveying, be reduced under similarity condition
Plus more than 4 minutes desulfurizing agent time, and hot metal temperature drop and splash are reduced, there is great economic benefit.
4th, design principle of the present invention is reliable, simple in construction, with very strong practicality and application value.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the mplifying structure schematic diagram of Pneumatic conveyer described in Fig. 1
Fig. 3 is A in Fig. 2 to zoomed-in view.
Fig. 4 is the mplifying structure schematic diagram of auxiliary blowing apparatus described in Fig. 1.
Reference：1- Pneumatic conveyers, 2- conveyance conduits, 3- auxiliary blowing apparatus, the 11- pump housings, 12- sends ware gasification
Room, 13- fluid beds, 14- fluidisation nitrogen tubes, 15- bottom blowing nitrogen tubes, 16- lobe playpipes, 17- mixing tubes, 18- conveying chutes,
19- charging apertures, 20- force feed nitrogen tubes, 31- gas bags, 32- air inlets, 33- playpipes, 34- outer tubes, 35- pulse valves, 36- electricity
Magnetic steering valve, the import of 161- lower ends, 162- upper end outlets.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As shown in Figure 1 and Figure 2, a kind of wave-pieced type dense-phase powder pumping system of the present embodiment, including it is Pneumatic conveyer 1, defeated
Pipeline 2 and the auxiliary blowing apparatus 3 for moving towards to install along conveyance conduit 2 are sent, the Pneumatic conveyer 1 includes the pump housing 11, the pump housing 11
Bottom, which is set, sends ware vaporizer 12, and the top for sending ware vaporizer 12 sets fluid bed 13, and its side and bottom are set respectively
Have a fluidisation nitrogen tube 14 and bottom blowing nitrogen tube 15, the bottom blowing nitrogen tube 15 through send ware vaporizer 12, fluid bed 13 it is upper
End sets lobe injector, and the top of lobe injector sets mixing tube 17, the upper end of mixing tube 17 and the one of conveying chute 18
End sealing is fixed, and the other end of conveying chute 18 is protruded upward outside the pump housing 11, and the top of the pump housing 11 is provided with charging aperture 19,
The side of charging aperture 19 sets force feed nitrogen tube 20, as shown in figure 3, lobe injector is periodic wave lobed shape, its lower end is entered
Mouth 161 to the side wall of upper end outlet is smooth excessiveness structure, is viewed from above above lobe injector, the presentation pair of its upper end outlet
Connecting portion formation trough between the petal shape of title, the outwardly directed partial shape crest of petal, petal, petal shape
Side wall between periphery and lower end import is the side wall of smooth excessiveness.
Specifically, a kind of wave-pieced type dense-phase powder pumping system that the present embodiment is provided, by raw material pumping installations
Through-type playpipe 33 be designed as lobe playpipe 16, in the material pumping device in hot metal in steelmaking pre-treating process
Lobe injection is introduced, Gas Mixing in Cross flow ability is improved by periodic wave valve structure, strengthens injection performance, lobe injection improves injection
Than more than 4 times, injection powder material concentration increase, conveying capacity increase forms Condensed transportation, the powder material concentration increase of conveying
After being improved with speed, material enters pressure increase during iron bag, makes splash pollution reduction.In use, following these steps operation：
1st, work starts, and opens fluidisation nitrogen tube 14 and supplies, by sending the air-flow of ware vaporizer 12 by thing on fluid bed 13
Material swells into fluidisation state；
2nd, auxiliary blowing apparatus 3 is opened；
3rd, bottom blowing nitrogen tube 15 is opened to the supply control of lobe injector 16 injection, mixed airflow；
4, the control valve for opening force feed nitrogen tube 20 provides force feed air-flow.
5, the control valve for opening charging aperture 19 carries out feeding.
6, after dnockout terminates, reversed sequence closes charging aperture 19, force feed nitrogen tube 20, lobe injection, fluidisation nitrogen successively
The control valve and auxiliary blowing apparatus 3 of pipe 14.
As shown in figure 3, the area of upper end outlet 162 and the area phase of lower end import 161 of lobe injector described in the present embodiment
Deng.Upper end outlet 162 and the area equation of lower end import 161, it is ensured that in the case where not reducing speed, injection ratio, obtain
Obtain preferable Gas Mixing in Cross flow ability.
As shown in figure 4, auxiliary blowing apparatus 3 described in the present embodiment includes being provided with air inlet 32 on gas bag 31, gas bag 31, its middle part
Vertical playpipe 33 is set, and the outside of playpipe 33 sets outer tube 34, and outer tube 34 is connected with gas bag 31, playpipe 33 and
Outer tube 34 installs pulse valve 35 and solenoid pilot valve 36 in upper end；The outer tube 34 is sealed with conveyance conduit 2 and fixed, injection
The lower end of pipe 33 is stretched into delivery pipe.The problem of line clogging being brought after Dense Phase Material Conveying, therefore the edge on conveyance conduit 2
Material moves towards to set multiple auxiliary blowing apparatus 3, and auxiliary blowing apparatus 3 includes gas bag 31 and playpipe 33, and playpipe 33 is convergent-divergent channel knot
Structure, and be arranged in outer tube 34, gas bag 31 is connected with outer tube 34, and pulse valve is installed in the upper end of outer tube 34 and playpipe 33
35 and solenoid pilot valve 36, it is spaced injection supersonic speed air pulse successively to convergent-divergent channel, it is possible to resolve the pipe that concentrated phase material web comes
Road is accumulated and originally often helps that blows to enter bag expulsion problem, blows valve system than originally often helping and can more disturb strength transporting velocity, presses
The field of force, the bank of strength evacuation accumulation, effectively prevents putty, helps that to blow performance more superior.
Wave-pieced type dense-phase powder pumping system as described above, the playpipe 33 is convergent-divergent channel, convergent-divergent channel axis
With the axis of conveyance conduit 2 into 30 ° of angle.When the axis of convergent-divergent channel axis and conveyance conduit 2 is into 30 ° of angle, to defeated
Send the anti-accumulated plugging of pipeline 2 and splash pollution effects more preferable.
As shown in figure 1, auxiliary blowing apparatus 3 described in the present embodiment is provided with multiple, adjacent auxiliary blowing apparatus along the trend of conveyance conduit 2
3 are set at intervals of 4m.Multiple auxiliary blowing apparatus 3 are arranged at intervals on conveyance conduit 2, can preferably extend the conveying of material away from
From, it is to avoid block.
Pulverized limestone (CaO) will be transported to by iron Bao Neituo by nitrogen in molten iron pre-treating process by the present invention
Sulphur, can improve desulfurizing agent unit interval addition, KR each desulfurization 7~9 minutes pulverized limestone times of conveying, be reduced under similarity condition
Plus more than 4 minutes desulfurizing agent time, and hot metal temperature drop and splash are reduced, there is great economic benefit.Other design principle of the present invention
Reliably, it is simple in construction, with very strong practicality and application value.
The technology contents of the not detailed description of the present invention are known technology.
Claims (4)
1. wave-pieced type dense-phase powder pumping system, it is characterised in that including Pneumatic conveyer, conveyance conduit and along delivery pipe
Road moves towards the auxiliary blowing apparatus installed, and the Pneumatic conveyer includes the pump housing, and pump housing bottom, which is set, sends ware vaporizer, sends ware
The top of vaporizer sets fluid bed, and its side and bottom are respectively arranged with fluidisation nitrogen tube and bottom blowing nitrogen tube, the bottom blowing
Nitrogen tube sets mixing tube through the upper end installation lobe injector for sending ware vaporizer, fluid bed, the top of lobe injector,
The upper end of mixing tube and one end sealing of conveying chute are fixed, and the other end of conveying chute is protruded upward outside the pump housing, the pump
Charging aperture is provided with the top of body, the side of charging aperture sets force feed nitrogen tube, and the lobe injector is periodic wave lobed shape,
Its lower end import is to the side wall of upper end outlet to seamlessly transit structure, and the upper end outlet area of the lobe injector and lower end are entered
Open area is equal.
2. wave-pieced type dense-phase powder pumping system according to claim 1, it is characterised in that the auxiliary blowing apparatus includes gas
Air inlet is provided with bag, gas bag, its middle part sets vertical playpipe, the outside of playpipe sets outer tube, outer tube and gas
Bag connection, playpipe installs pulse valve and solenoid pilot valve with outer tube in upper end；The outer tube and conveyance conduit sealing are solid
Fixed, the lower end of playpipe is stretched into delivery pipe.
3. wave-pieced type dense-phase powder pumping system according to claim 2, it is characterised in that the playpipe is Lavalle
Pipe, the axis of convergent-divergent channel axis and conveyance conduit is into 0~35 ° of angle.
4. wave-pieced type dense-phase powder pumping system according to claim 3, it is characterised in that auxiliary blowing apparatus edge conveying
Pipeline rout be provided with it is multiple, adjacent auxiliary blowing apparatus at intervals of 3~5m set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638755.9A CN105253629B (en) | 2015-09-30 | 2015-09-30 | Wave-pieced type dense-phase powder pumping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638755.9A CN105253629B (en) | 2015-09-30 | 2015-09-30 | Wave-pieced type dense-phase powder pumping system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105253629A CN105253629A (en) | 2016-01-20 |
| CN105253629B true CN105253629B (en) | 2017-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510638755.9A Expired - Fee Related CN105253629B (en) | 2015-09-30 | 2015-09-30 | Wave-pieced type dense-phase powder pumping system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356851B (en) * | 2019-07-25 | 2024-03-01 | 江苏大学 | Powder material distributing device and method |
| CN113291818B (en) * | 2021-06-25 | 2024-08-27 | 韦可壮 | Jet pump system for mixing and conveying by utilizing steam powder collision |
| CN113526140A (en) * | 2021-07-07 | 2021-10-22 | 长兴新城环保有限公司 | Anti-blocking mechanism of pneumatic ash conveying bin pump |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2317217Y (en) * | 1997-01-14 | 1999-05-05 | 冶金工业部钢铁研究总院 | High efficiency storehouse type pump conveying material in bulk |
| EP2576264B1 (en) * | 2010-05-28 | 2016-01-13 | Kiekert Aktiengesellschaft | Actuator for motor vehicle |
| CN102705272B (en) * | 2011-08-31 | 2014-12-03 | 韩铁夫 | Jet pump |
| CN102635578A (en) * | 2011-12-23 | 2012-08-15 | 南京航空航天大学 | Multilevel lobed nozzle ejector with secondary-fluid sucking function |
| CN202704570U (en) * | 2012-06-28 | 2013-01-30 | 苏州欧蓝森环境设备有限公司 | Pneumatic conveying and supplying generator |
| CN102976106B (en) * | 2012-11-16 | 2015-05-06 | 浙江莱德桑机械有限公司 | Fluidization cabinet type delivery pump and method thereof |
| CN204021931U (en) * | 2014-06-06 | 2014-12-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A material conveying pipe and its auxiliary device |
| CN204522540U (en) * | 2015-01-30 | 2015-08-05 | 成都易态科技有限公司 | Gas-filtering device and blowback system thereof |
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