CN205182655U - Motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system - Google Patents
Motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system Download PDFInfo
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- CN205182655U CN205182655U CN201520939186.7U CN201520939186U CN205182655U CN 205182655 U CN205182655 U CN 205182655U CN 201520939186 U CN201520939186 U CN 201520939186U CN 205182655 U CN205182655 U CN 205182655U
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Abstract
The utility model discloses a motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system, including batching cauldron, weighing hopper, four former feed bins, four material storehouses, former feed bin and material storehouse one -to -one, the discharge end of former feed bin is through power material feeding unit and connect conveying pipeline on power material feeding unit to be connected to the feed end of homologue feed bin, and material storehouse discharge end is connected to the weighing hopper through the feed pipeline, is equipped with electromagnetism metrological control appearance on the feed pipeline, in the discharge end of weighing hopper is connected to the batching cauldron, the batching cauldron on be equipped with outer charge door, be equipped with the closing cap on the outer charge door, the batching cauldron in be equipped with the stirring body, the batching cauldron bottom row of being equipped with material pipe is arranged and is equipped with the baiting valve on the material pipe. The beneficial effects of the utility model are that: rational in infrastructure, quick batching, the one -tenth thick liquid that realize tail -gas clean -up catalyst converter coating thick liquids effectively of ability can ensure that the component distributions such as the interior noble metal of thick liquids of acquisition are even, stable good.
Description
Technical field
The utility model belongs to the coating slurry technical field of exhaust purification catalytic device, particularly relates to a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system.
Background technology
Day by day serious along with automobile exhaust pollution, in order to suppress the generation of harmful substance in tail gas, the discharge of national governments to vehicle exhaust proposes strict control.Wherein European standard is the Main Auto discharge standard that current China uses for reference.In China's motor vehicle emission standard, pollutant emission limit equivalent European emission standard substantially, also continue to use similar address, but both still has certain technological disparity in native land." light-duty vehicle pollutant emission limit and measuring method (I) " that China formulates is equivalent to " Europe I " standard; " light-duty vehicle pollutant emission limit and measuring method (II) " is equivalent to " Europe II " standard.State Environmental Protection Administration discloses on April 28th, 2007 the motor vehicle emission Chinese Industrial Standards (CIS) being equivalent to Europe III and Europe IV.At present, State Environmental Protection Administration specifies that on January 1st, 2018 implements in full state V discharge standard.In a word, along with the increasingly stringent of Abgasgesetz, very urgent to the preventing and controlling of automobile exhaust pollution.
At present, exhaust gas catalytic converter is installed and has become the effective way of Preventing Automobile Exhaust.For this reason, catalyst operation persons have made long-term and unremitting effort, and successfully have developed can the three-way catalyst of practical application, and under the effect of this kind of catalyst, HC, CO and NOx tri-kinds of pollutants can reach to be eliminated simultaneously.But at production application process aspect, also there is a lot of problems.The active component of three-way catalyst is the noble metals such as Pt, Pd, Rh, and the uniformity (uniformity that noble metal is combined with catalyst converter and adequacy) of active constituent loading directly affects catalytic performance.Coating paste uniformity is a large problem, and slurry is uneven, easily occurs layering, precipitation, causes the problems such as precious metal adsorption is incomplete.How must load to evenly effective for noble metal active component on carrier material, making active component obtain efficiency utilization is the part current production technology needing update.
Utility model content
The utility model is to overcome deficiency of the prior art, provide a kind of rational in infrastructure, fast and effeciently can realize batching, the pulping of exhaust purification catalytic device coating slurry, the feed proportioning system of the uniform component distribution such as noble metal, good stability in the slurry that can ensure acquisition.
To achieve these goals, the utility model is by the following technical solutions:
A kind of motor vehicle vent gas purification catalysis device coating slurry dispense system, comprise batching kettle, weighing hopper, four raw material cabins, four material bins, raw material cabin and material bin one_to_one corresponding, the discharge end of raw material cabin is connected to the feed end of homologue feed bin by power pay-off and the conveying pipeline be connected on power pay-off, material bin discharge end is connected to weighing hopper by feeding pipeline, feeding pipeline is provided with electromagnetic measurement controller, the discharge end of weighing hopper is connected in batching kettle, described batching kettle is provided with external feeding mouth, external feeding mouth is provided with capping, stirring body is provided with in described batching kettle, drainage conduit is provided with bottom batching kettle, drainage conduit is provided with baiting valve.Can drop into various required raw material in four raw material cabins, raw material sends into each material bin by power pay-off, conveying pipeline.By electromagnetic measurement controller, can control the feed quantity in weighing hopper, the material in weighing hopper is then entered in batching kettle by feeding pipeline together.Material bin is mainly used in providing solid constituent (powder also comprises precious metal raw material as complex rare-earth oxidate containing valuable metal), and remaining fluid Body components is as deionized water, a certain amount of acid etc., then can drop into from charge door.Feed intake after all completing, the stirring body in batching kettle carries out the stirring of material, thus realizes slurrying, and can ensure the uniformity of slurry.
As preferably, four described material bins are in above weighing hopper, and described weighing hopper is in above batching kettle.Except utilizing power, gravity can also can be utilized to carry out feed, promote feeding speed and effect.
As preferably, described power pay-off is dehvery pump, and the discharge end of raw material cabin and the charging aperture of dehvery pump are connected, and described conveying pipeline one end is docked with the discharging opening of dehvery pump, and the conveying pipeline other end is communicated with the feed end of material bin.
As preferably, described batching kettle comprises cylindric still body, is connected to still still top with it, is connected at the bottom of still still with it, still body axis vertical, described external feeding mouth is on still top, described stirring body comprises vertical shaft, the some agitating plate leaves be located on shaft, shaft axis and the dead in line of still body, described shaft is driven by a stirring motor.Driven by motor shaft (also can be driven by structures such as reductors) is rotated, and shaft drives some agitating plate leaves to rotate, thus stirs the raw material in batching kettle, can promote the uniformity of composition in pulping efficiency and slurry.
As preferably, also comprise a fixed frame, still body and fixed frame are rotationally connected, the center of rotation of still body is still body axis, a mair motor for driving still body to rotate around still body axis is provided with below described still body, mair motor is connected at the bottom of still by reductor, at least four blocks of arc plates are provided with in described still body, arc plate outer surface can be fitted with still body interior sidewall surface, each arc plate is even annular distribution centered by still body axis, space between adjacent arcs plate is side material passing passage, described arc plate is provided with some sideslip bars, sideslip bar passes still body sidewall and is connected with still body side walls, described sideslip bar outer end is in outside still body, sideslip bar outer end is provided with pressing plate, pressing plate is provided with balancing weight, some arm-tie springs are provided with between pressing plate and still body, arm-tie spring one end connects pressing plate, the arm-tie spring other end connects still body outer side surface.Described mair motor is preferably buncher.Still body can rotate, and shaft also can rotate, and certainly, in practical operation, preferably allows still body and shaft reversely rotate, if rotating Vortex, then velocity of rotation otherwise with, otherwise just become " geo-stationary ".We know, the cylindrical container of this class of batching kettle, in the process of carrying out slurry mixing, adherent slurry is not easy to be stirred, and (in reality, stirring structure is difficult to accomplish adherent first, scrape the negative effect such as wall, aggravation vibrations because have, and the accuracy of manufacture requires too high; Have centrifugal action when second stirring, the solid that in slurry, quality is larger, particle are easily adherent, so be difficult to guarantee be fully mixed into slurry).Moreover, easily there is the problem such as lower leaf and precipitation, be also unfavorable for ensureing slurry Homogeneous phase mixing.And in this programme, there is arc plate structure, arc plate outer surface can be fitted with still body interior sidewall surface, under off working state, has surplus between arc plate and still body interior sidewall surface, and now arm-tie spring is not also stretched.When operating (during stirring), along with still body rotating speed promotes, under the influence of centrifugal force, the outside displacement of balancing weight becomes large (now arm-tie spring elongation), drive arc plate near being also labelled to still body interior sidewall surface gradually, thus can the slurry at adherent place is upper and lower to arc plate, both sides extrude, come back to Fu Shen center.And again interior mobile to arc plate, only need mair motor to stop, or frequency control (reduction of speed), so under the return action of arm-tie spring, arc plate will move in case.And in actual whipping process, stirring body stirs always, under the effect of stirring body, inner slurry outwards moves (towards still body sidewall), and mair motor can repeatedly accelerate, slow down, or repeatedly start, stop, when under acceleration, arc plate promotes the slurry at adherent place on arc plate, under, both sides are extruded, the slurry upwards extruded is equivalent to move from the bottom to top, thus achieve the effect of will bottom slurry turn over, upper lower leaf and the components precipitate problem of slurry can be solved, the slurry extruded to both sides, remaining adherent slurry can be impacted (time as adherent in arc plate, adherent slurry in Nei Ji side, space material passing passage between adjacent arcs plate, adherent slurry is allowed again to be mixed into Fu Shen center, re-start stirring, therefore can ensure that slurry has high uniformity.
As preferably, described stirring motor is in above still top, and shaft is through still top, still top is provided with bearing bracket stand, and bearing bracket stand is provided with the apical axis coaxial with still body and holds, and is provided with inside groove at the bottom of still, be provided with the base bearing coaxial with still body in inside groove, apical axis holds, base bearing is all connected with shaft.
As preferably, described still is provided with some airtight and watertight padding blocks with it, and described airtight and watertight padding block and sideslip bar one_to_one corresponding, between described airtight and watertight padding block and corresponding sideslip bar, slipper seal coordinates.
The beneficial effects of the utility model are: rational in infrastructure, fast and effeciently can realize batching, the pulping of exhaust purification catalytic device coating slurry, uniform component distribution, the good stability such as noble metal in the slurry that can ensure acquisition.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation at the utility model batching kettle place;
Fig. 3 is the structural representation at the utility model bearing bracket stand place;
Fig. 4 is the structural representation at the utility model pressing plate, balancing weight place;
Fig. 5 is the structural representation at the utility model feed check valve place.
In figure: at the bottom of batching kettle 1, weighing hopper 2, raw material cabin 3, material bin 4, power pay-off 5, conveying pipeline 6, electromagnetic measurement controller 7, drainage conduit 8, baiting valve 9, still body 10, still top 11, still 12, shaft 13, some agitating plate leaves 14, stirring motor 15, mair motor 16, reductor 17, arc plate 18, sideslip bar 19, pressing plate 20, balancing weight 21, arm-tie spring 22, bearing bracket stand 23, apical axis hold 24, base bearing 25, airtight and watertight padding block 26, feed check valve 27.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
In embodiment as shown in Figures 1 to 5, a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system, comprise batching kettle 1, weighing hopper 2, four raw material cabins 3, four material bins 4, raw material cabin and material bin one_to_one corresponding, the discharge end of raw material cabin is connected to the feed end of homologue feed bin by power pay-off 5 and the conveying pipeline 6 be connected on power pay-off, material bin discharge end is connected to weighing hopper by feeding pipeline, feeding pipeline is provided with electromagnetic measurement controller 7, the discharge end of weighing hopper is connected in batching kettle, described batching kettle is provided with external feeding mouth, external feeding mouth is provided with capping, stirring body is provided with in described batching kettle, drainage conduit 8 is provided with bottom batching kettle, drainage conduit is provided with baiting valve 9.Can drop into various required raw material in four raw material cabins, raw material sends into each material bin by power pay-off, conveying pipeline.By electromagnetic measurement controller, can control the feed quantity in weighing hopper, the material in weighing hopper is then entered in batching kettle by feeding pipeline together.Material bin is mainly used in providing solid constituent (powder also comprises precious metal raw material as complex rare-earth oxidate containing valuable metal), and remaining fluid Body components is as deionized water, a certain amount of acid etc., then can drop into from charge door.Feed intake after all completing, the stirring body in batching kettle carries out the stirring of material, thus realizes slurrying, and can ensure the uniformity of slurry.
Four described material bins are in above weighing hopper, and described weighing hopper is in above batching kettle.Except utilizing power, gravity can also can be utilized to carry out feed, promote feeding speed and effect.
Described power pay-off is dehvery pump, and the discharge end of raw material cabin and the charging aperture of dehvery pump are connected, and described conveying pipeline one end is docked with the discharging opening of dehvery pump, and the conveying pipeline other end is communicated with the feed end of material bin.
Described batching kettle comprises cylindric still body 10, be connected to still still top 11 with it, to be connected at the bottom of still still with it 12, still body axis vertical, described external feeding mouth is on still top, described stirring body comprises vertical shaft 13, the some agitating plate leaves 14 be located on shaft, shaft axis and the dead in line of still body, described shaft is driven by a stirring motor 15.Driven by motor shaft (also can be driven by structures such as reductors) is rotated, and shaft drives some agitating plate leaves to rotate, thus stirs the raw material in batching kettle, can promote the uniformity of composition in pulping efficiency and slurry.
Also comprise a fixed frame, still body and fixed frame are rotationally connected, the center of rotation of still body is still body axis, a mair motor 16 for driving still body to rotate around still body axis is provided with below described still body, mair motor is connected at the bottom of still by reductor 17, at least four blocks of arc plates 18 are provided with in described still body, arc plate outer surface can be fitted with still body interior sidewall surface, each arc plate is even annular distribution centered by still body axis, space between adjacent arcs plate is side material passing passage, described arc plate is provided with some sideslip bars 19, sideslip bar passes still body sidewall and is connected with still body side walls, described sideslip bar outer end is in outside still body, sideslip bar outer end is provided with pressing plate 20, pressing plate is provided with balancing weight 21, some arm-tie springs 22 are provided with between pressing plate and still body, arm-tie spring one end connects pressing plate, the arm-tie spring other end connects still body outer side surface.Described mair motor is preferably buncher.Still body can rotate, and shaft also can rotate, and certainly, in practical operation, preferably allows still body and shaft reversely rotate, if rotating Vortex, then velocity of rotation otherwise with, otherwise just become " geo-stationary ".We know, the cylindrical container of this class of batching kettle, in the process of carrying out slurry mixing, adherent slurry is not easy to be stirred, and (in reality, stirring structure is difficult to accomplish adherent first, scrape the negative effect such as wall, aggravation vibrations because have, and the accuracy of manufacture requires too high; Have centrifugal action when second stirring, the solid that in slurry, quality is larger, particle are easily adherent, so be difficult to guarantee be fully mixed into slurry).Moreover, easily there is the problem such as lower leaf and precipitation, be also unfavorable for ensureing slurry Homogeneous phase mixing.And in this programme, there is arc plate structure, arc plate outer surface can be fitted with still body interior sidewall surface, under off working state, has surplus between arc plate and still body interior sidewall surface, and now arm-tie spring is not also stretched.When operating (during stirring), along with still body rotating speed promotes, under the influence of centrifugal force, the outside displacement of balancing weight becomes large (now arm-tie spring elongation), drive arc plate near being also labelled to still body interior sidewall surface gradually, thus can the slurry at adherent place is upper and lower to arc plate, both sides extrude, come back to Fu Shen center.And again interior mobile to arc plate, only need mair motor to stop, or frequency control (reduction of speed), so under the return action of arm-tie spring, arc plate will move in case.And in actual whipping process, stirring body stirs always, under the effect of stirring body, inner slurry outwards moves (towards still body sidewall), and mair motor can repeatedly accelerate, slow down, or repeatedly start, stop, when under acceleration, arc plate promotes the slurry at adherent place on arc plate, under, both sides are extruded, the slurry upwards extruded is equivalent to move from the bottom to top, thus achieve the effect of will bottom slurry turn over, upper lower leaf and the components precipitate problem of slurry can be solved, the slurry extruded to both sides, remaining adherent slurry can be impacted (time as adherent in arc plate, adherent slurry in Nei Ji side, space material passing passage between adjacent arcs plate, adherent slurry is allowed again to be mixed into Fu Shen center, re-start stirring, therefore can ensure that slurry has high uniformity.
Described stirring motor is in above still top, and shaft is through still top, and still top is provided with bearing bracket stand 23, bearing bracket stand is provided with the apical axis coaxial with still body and holds 24, be provided with inside groove at the bottom of still, be provided with the base bearing 25 coaxial with still body in inside groove, apical axis holds, base bearing is all connected with shaft.
Described still is provided with some airtight and watertight padding blocks 26 with it, and described airtight and watertight padding block and sideslip bar one_to_one corresponding, between described airtight and watertight padding block and corresponding sideslip bar, slipper seal coordinates.
Level at the bottom of described still, be slidably matched between inner surface at the bottom of described arc plate lower surface and still, described arc plate is provided with some lower charging holes running through arc plate plate face, feed check valve 27 is provided with in described lower charging hole, feed check valve be to away from shaft direction near shaft by direction, lower charging hole axis horizontal, lower charging hole axis and the distance at the bottom of still are less than 1/10th of arc plate height.The height of described arc plate is less than 2/3rds of still height degree, and the height of arc plate is greater than the half of still height degree.Be slidably matched between inner surface at the bottom of arc plate lower surface and still, meaning at the bottom of arc plate lower surface and still between inner surface can not (or not easily) punishment in advance, and axis and the distance at the bottom of still are less than the charging hole of arc plate height 1/10th, then ensure that the slurry at Fu Shen center can enter between arc plate and still body from below and (pass through feed check valve).So, when pressing in arc plate, slurry bottom still body enters between arc plate and still body, the slurry at Fu Shen center also some from side material passing passage, enter between arc plate and still body above arc plate, and move in (moving towards still body sidewall) process outside arc plate, can not discharging below arc plate, slurry only can be extruded from arc plate side and top, both the adherent slurry of side had been impacted, again the bottom slurry advanced into of a part is upwards extruded, get back to still side with it, center, then be again stirred body to stir, mixing effect is excellent, effectively can also solve the layering of slurry, precipitation, the adherent problem such as irregular.
The step that uses the utility model to carry out powder batching is the amount of A, B, C, D powder that (1) throws in needed for recipe calculation.Described A, B, C, D powder is respectively complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides, bonding agent.The proportioning of described complex rare-earth oxidate containing valuable metal, modified aluminas, sial composite oxides is 0 ~ 0.8:0 ~ 1:0 ~ 1.Described bonding agent consumption is 5 ~ 10% of powder amount.In described complex rare-earth oxidate containing valuable metal, the mol ratio of cerium, zirconium is that one or both the addition that the addition of 1:5 ~ 1:1, La is counted in 3% ~ 5%, Pr, Nd in the form of an oxide counts 3% ~ 5% in the form of an oxide.Described modified aluminas is the γ-Al of La modification
2o
3, adopt lanthana and modified aluminas ball-milling method mechanical mixture to obtain, the addition of La counts 2% ~ 8% in the form of an oxide.In described sial composite oxides, silica alumina ratio is 10 ~ 40.Described binding agent is one or both the mixture in boehmite, aluminum nitrate.(2) powder is delivered to material bin by raw material cabin, then throws in in weighing hopper.Powder quantitative in weighing hopper is put into batching kettle.The quality of the required powder thrown in is 5 ~ 100Kg.(3) the various powders needed for add a certain amount of water and acid after quantitatively having thrown in respectively in batching kettle, stir 2 ~ 6h.Regulate slurry solid content to be 10 ~ 30%, pH value is 2 ~ 6.Described acid is one or both the mixing in nitric acid, oxalic acid.(4) after stirring, open the baiting valve in batching kettle, slurry is put into sand mill and carry out sand milling.
Claims (7)
1. a motor vehicle vent gas purification catalysis device coating slurry dispense system, it is characterized in that, comprise batching kettle, weighing hopper, four raw material cabins, four material bins, raw material cabin and material bin one_to_one corresponding, the discharge end of raw material cabin is connected to the feed end of homologue feed bin by power pay-off and the conveying pipeline be connected on power pay-off, material bin discharge end is connected to weighing hopper by feeding pipeline, feeding pipeline is provided with electromagnetic measurement controller, the discharge end of weighing hopper is connected in batching kettle, described batching kettle is provided with external feeding mouth, external feeding mouth is provided with capping, stirring body is provided with in described batching kettle, drainage conduit is provided with bottom batching kettle, drainage conduit is provided with baiting valve.
2. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 1, it is characterized in that, four described material bins are in above weighing hopper, and described weighing hopper is in above batching kettle.
3. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 1 and 2, it is characterized in that, described power pay-off is dehvery pump, the discharge end of raw material cabin and the charging aperture of dehvery pump are connected, described conveying pipeline one end is docked with the discharging opening of dehvery pump, and the conveying pipeline other end is communicated with the feed end of material bin.
4. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 1, it is characterized in that, described batching kettle comprises cylindric still body, is connected to still still top with it, is connected at the bottom of still still with it, still body axis vertical, described external feeding mouth is on still top, described stirring body comprises vertical shaft, the some agitating plate leaves be located on shaft, and shaft axis and the dead in line of still body, described shaft is driven by a stirring motor.
5. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 4, it is characterized in that, also comprise a fixed frame, still body and fixed frame are rotationally connected, the center of rotation of still body is still body axis, a mair motor for driving still body to rotate around still body axis is provided with below described still body, mair motor is connected at the bottom of still by reductor, at least four blocks of arc plates are provided with in described still body, arc plate outer surface can be fitted with still body interior sidewall surface, each arc plate is even annular distribution centered by still body axis, space between adjacent arcs plate is side material passing passage, described arc plate is provided with some sideslip bars, sideslip bar passes still body sidewall and is connected with still body side walls, described sideslip bar outer end is in outside still body, sideslip bar outer end is provided with pressing plate, pressing plate is provided with balancing weight, some arm-tie springs are provided with between pressing plate and still body, arm-tie spring one end connects pressing plate, the arm-tie spring other end connects still body outer side surface.
6. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 4, it is characterized in that, described stirring motor is in above still top, shaft is through still top, still top is provided with bearing bracket stand, and bearing bracket stand is provided with the apical axis coaxial with still body and holds, and is provided with inside groove at the bottom of still, be provided with the base bearing coaxial with still body in inside groove, apical axis holds, base bearing is all connected with shaft.
7. a kind of motor vehicle vent gas purification catalysis device coating slurry dispense system according to claim 5, it is characterized in that, described still is provided with some airtight and watertight padding blocks with it, described airtight and watertight padding block and sideslip bar one_to_one corresponding, between described airtight and watertight padding block and corresponding sideslip bar, slipper seal coordinates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520939186.7U CN205182655U (en) | 2015-11-23 | 2015-11-23 | Motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520939186.7U CN205182655U (en) | 2015-11-23 | 2015-11-23 | Motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system |
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| CN205182655U true CN205182655U (en) | 2016-04-27 |
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| CN201520939186.7U Active CN205182655U (en) | 2015-11-23 | 2015-11-23 | Motor vehicle exhaust purifies catalyst converter coating thick liquids feed proportioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105457536A (en) * | 2015-11-23 | 2016-04-06 | 浙江达峰汽车技术有限公司 | Exhaust gas purifying catalytic device surface slurry batching system |
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2015
- 2015-11-23 CN CN201520939186.7U patent/CN205182655U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105457536A (en) * | 2015-11-23 | 2016-04-06 | 浙江达峰汽车技术有限公司 | Exhaust gas purifying catalytic device surface slurry batching system |
| CN105457536B (en) * | 2015-11-23 | 2017-09-22 | 浙江达峰汽车技术有限公司 | A kind of exhaust purification catalytic device surface size feed proportioning system |
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