CN107377864A - Dustless processing technology of precoated sand and preparation method thereof - Google Patents
Dustless processing technology of precoated sand and preparation method thereof Download PDFInfo
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- CN107377864A CN107377864A CN201710620909.0A CN201710620909A CN107377864A CN 107377864 A CN107377864 A CN 107377864A CN 201710620909 A CN201710620909 A CN 201710620909A CN 107377864 A CN107377864 A CN 107377864A
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- sand
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/0481—Blending, mixing, kneading or stirring; Methods therefor using vibrations
Abstract
The present invention relates to dustless processing technology of a kind of precoated sand and preparation method thereof, more particularly to precoated sand manufacture field, purpose is solve the problems, such as component proportion ratio inaccurate, reduce the heat time of heating chamber, firing rate is fast and thermal loss is small, the quality of finished product is improved, is reduced environmental pollution, step 1：Entering three kinds of sand of sand stage weighing, iron sand, SEMEN AMOMI LONGILIGULA, Fujian sand, the weight data signal of three kinds of sand is being sent to by controller by sensor respectively, three kinds of sand of control enter sand amount；Step 2：Three kinds of sand are preheated in pre- storage, heating chamber heats to three kinds of sand；Step 3：Heated in heating chamber using direct-injection, mixed sand is spread in the sand device rotation point of raising in heating chamber；Step 4：The mixed sand heated in heating chamber adds bentonite, resin, graphite, curing agent when entering puddle mixer；Step 5：Mixed sand is crushed, echelon filtering；Step 6：Roller cools down, and conveys finished product.
Description
Technical field
The present invention relates to precoated sand manufacture field, more particularly to dustless processing technology of a kind of precoated sand and preparation method thereof.
Background technology
Precoated sand, sand grain surface are covered with the molding sand or core of one layer of hard resin film before moulding, and precoated sand mainly uses
High-quality selected natural siliceous sand is roughing sand, and thermoplastic phenolic resin, methenamine and reinforcing agent are raw material.According to the difference of user
Technical need, match somebody with somebody in the appropriate adjustment of curing rate, demoulding, mobility, collapsibility, surface finish of casting, storage etc.
Than.Overlay film sand molding is used in the higher intricate casting of dimension precision requirement, is the optimum shaping material such as automobile, tractor, hydraulic part
One of material, such as in the casting of engine body etc., with the development of external machinery industry especially automobile industry, to casting matter
Measure and require more and more higher, the application that mould covers sand is more and more extensive.
The processing technology of existing precoated sand is a kind of highly energy-consuming, and with serious pollution production method, and yield is also relatively
It is low.Existing precoated sand processing is heated by burning coal, and not only floor space is big, and the generation exhaust emission that burns is more, production
Factory building working environment is severe, very big for the health effect of direct labor, and bigger, the low production efficiency of the good energy of heat.Pass
Dust caused by the processing technology of system is relatively more, and sealing is not good enough, and dedusting is also bad.Ratio is unstable, and traditional coal
Charcoal Air-pollution From Combustion is serious and uneven, and final product quality out is also unstable, and many batches of output finished product standards differ, Er Qiezhi
Amount cannot guarantee that.
In view of it is above-mentioned the defects of, the design people is actively subject to research and innovation, to found a kind of dustless processing of precoated sand
Technique and preparation method thereof, due to its safety and reliability, make it with more the value in industry.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of dustless processing technology of precoated sand and its preparation side
Method, solve the problems, such as the inaccurate of component proportion ratio, reduce the heat time of heating chamber, firing rate is fast and thermal loss
It is small, the quality of finished product is improved, is reduced environmental pollution.
A kind of dustless processing technology of precoated sand and preparation method thereof, it is characterised in that：
Step 1：Entering three kinds of sand of sand stage weighing, iron sand, SEMEN AMOMI LONGILIGULA, Fujian sand, by sensor respectively by three kinds of sand
Weight data signal be sent to controller, the controller is controlled into sand warehouse valve switch, with scheduled timing successively to three kinds
Sand is weighed, and three kinds of sand of control enter sand amount；
Step 2：Three kinds of sand are preheated using waste hot gas in pre- storage；
Step 3：Heating chamber automatic ignition heats to three kinds of sand for entering the heating chamber；Direct-injection is used in heating chamber
Heat, mixed sand is spread in the sand device rotation point of raising in heating chamber；
Step 4：Mixed sand enters puddle mixer, the mixed sand addition bentonite into puddle mixer, after the completion of bentonite addition
Resin is added in 30 seconds, graphite is added in 50 seconds after adding resin, curing agent is added in 80 seconds after adding graphite；
Step 5：Multi-layer vibration crushing, echelon filtering are carried out to mixed sand；
Step 6：The mixed sand filtered cools down into roller, and drums inside is by screw feeding, cooling and conveying finished product,
Then packed after being lifted by elevator.
Further, in the puddle mixer after mixed sand mixing, dry and dry twice；
1) the blowing duration is 15 seconds for the first time；
2) it is spaced 20 seconds between first time blowing and second are dried, calcium powder was added for the first time in 20 seconds；
3) second of blowing duration is 70 seconds；
4) calcium powder is added for the second time when temperature is reduced to 80 degree.
Further, the mixed sand weight is 700 kilograms, and the part by weight parameter of three kinds of sand is iron sand 8%, SEMEN AMOMI LONGILIGULA
46%th, Fujian sand 46%.
Further, the preheating temperature of the pre- storage is 15~40 degree, and the time that three kinds of sand enter heating chamber is 90 seconds.
Further, the heating-up temperature of the heating chamber is 110~120 degree, and the rotation point of sand device is raised after 90 seconds heat times
Spread mixed sand.
Further, the bentonite is 100~350 grams；The resin is 9.80~20.65 kilograms；The graphite is
0.8~3.6 kilogram.
Further, the curing agent is methenamine solution, and the mass ratio of methenamine and water is 1: 2.
Further, it is weight resin that the first time, which adds calcium powder with second of calcium powder weight total amount for adding calcium powder,
0.06%.
By such scheme, the present invention at least has advantages below：1st, solved by precisely weighing, solve a group distribution
Than ratio it is inaccurate the problem of, and then solve the problems, such as that precoated sand produces unstable product quality.2nd, by using waste hot gas
By the pre-warmed mode of pre- storage, solve the problems, such as energy waste, and reduce the heat time of heating chamber.3rd, improve
The problem of mode of heating, it is slow that direct-injection heating solves firing rate, and thermal loss is big.4th, by using sand equipment sand
Mode, solves the problems, such as the problem of heating is uneven and mixed sand precipitation condenses.5th, by sand blender, this step is added
The component material of the certain proportion parameters such as graphite, resin, tropine solution, calcium causes the precoated sand product of production in matter such as the uniformitys
Amount parameter is greatly improved.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Embodiment
With reference to embodiment, the embodiment of the present invention is described in further detail.Following examples are used for
Illustrate the present invention, but be not limited to the scope of the present invention.
Embodiment 1
A kind of dustless processing technology of precoated sand and preparation method thereof,
Step 1：Entering three kinds of sand of sand stage accurate weighing, iron sand, SEMEN AMOMI LONGILIGULA, Fujian sand, by sensor respectively by three
The weight data signal of kind of sand is sent to controller, and the controller is controlled into sand warehouse valve switch, sequentially in time unanimously
Circulation weighs, and three kinds of sand of control enter sand amount；
Step 2：Three kinds of sand are preheated in pre- storage, three kinds of sand preheated by waste hot gas, while heating chamber
Automatic ignition heats to three kinds of sand for entering the heating chamber；
Step 3：Heated in heating chamber using direct-injection, while mixed sand is spread in the sand device rotation point of raising in heating chamber；
Step 4：The mixed sand heated in the heating chamber adds bentonite when entering puddle mixer, add tree at 30 seconds
Fat, graphite is added at 50 seconds, add curing agent within 80 seconds；
Step 5：Multi-layer vibration crushing, echelon filtering are carried out to mixed sand；
Step 6：The mixed sand filtered cools down into roller, and drums inside passes through screw feeding, convenient cooling and conveying
Finished product, packed after then being lifted by elevator.
By being weighed to three kinds of placer iron sand, SEMEN AMOMI LONGILIGULA, Fujian sand, the accuracy of the mixing match for three kinds of sand is improved,
Specifically by the material temporary storing bin of three kinds of sand, set and controlled according to time sequencing, it is suitable according to the time into weighing lifting device
Sequence weighs weight, and subsequently into elevator, pre- storage is sent to by elevator, prestores storehouse bottom valve by control to enter heating
Room, heating chamber lifts rapidly heating room temperature by new natural gas direct-injection mode of heating, and raises sand device by heating chamber
Rotation drive and raise sand, mixed sand is fully heated with uniformly scattering, also allow heating evenly and can just be reached interior in short-term
To the effect of heating.The waste hot gas of heating chamber can also have been preheated the mixed sand of pre- storage in passing, taken full advantage of by pre- storage
Thermal effect.
Then the mixed sand heated is sent to puddle mixer and is stirred, while the respective components of each batch hopper are not according to
With proportioning parameter, adding puddle mixer has sequencing when enter dispensing, after being stirred of certain time, is formed
Precoated sand finished product, then sieved by good parallel vibrating broken so that precoated sand vibrations it is scattered without because it is hotter and
Precipitation condenses, and the precoated sand to scatter is vibrated into chilling roll by tilting material mouth, instead of by the water cooling of this roller
Traditional vibration cooling method, not only can rapidly and uniformly be cooled down, and greatly reduce the spilling of dust, also will not be because of straight
Connect with air contact and adsorb other dust in air, environmental protection and improve cooling effectiveness.Wherein roller is cooled to low speed rotation
In order to preferably contact cooling.
The elevated machine of precoated sand finished product after finally cooling down is sent to finished bin, then packing packaging.Whole technological process is not
Only production efficiency is high, and it is few to consume energy, and the waste gas discharge unification in all stages passes through last cyclone dust collector and bottom blowing
Gas dust-proof water tank is in air is discharged to, so reducing the discharge of pollution waste gas to greatest extent, it may be said that dustless pollution-free.This
The precoated sand final product quality of output is high in the case of kind, and the product quality of each period is stable.
Embodiment 2
It is further to be different from embodiment 1, in the puddle mixer after mixed sand mixing, dry and dry twice；
1) the blowing duration is 15 seconds for the first time；
2) it is spaced 20 seconds between first time blowing and second are dried, calcium powder was added for the first time in 20 seconds；
3) second of blowing duration is 70 seconds；
4) calcium powder is added for the second time when temperature is reduced to 80 degree.
First time blow-time, which primarily serves desiccation for 15 seconds, prevents the moisture of tropine solution from causing to lump, distance second
Secondary blowing interval 20 seconds, added calcium powder within this 20 seconds, adds at twice, specifically add 75%, after-blow 70 for the first time
Wonderful left and right main purpose is cooling effect, and temperature is reduced to 80 DEG C and then carries out secondary plus calcium powder remaining 25% after cooling, two
Secondary adding purpose causes mixed sand oil lubrication to strengthen.
Embodiment 3
It is further to be different from Examples 1 and 2, mixed sand weight is 700 kilograms, and the part by weight parameter of three kinds of sand is iron
Sand 8%, SEMEN AMOMI LONGILIGULA 46%, Fujian sand 46%.
The preheating temperature of pre- storage is 30 degree, and the time into heating chamber is 90 seconds.The heating-up temperature of heating chamber is 110
Degree, the rotation point of sand device is raised after 90 seconds heat times and spreads mixed sand.Bentonite is 225 grams；Resin is 15 kilograms；Graphite is 2.2 public
Jin.Curing agent is methenamine solution, and the volume ratio of methenamine and water is 1: 2.Calcium powder is added for the first time with second to add
The calcium powder weight total amount for entering calcium powder is the 0.06% of weight resin.
The temperature of heating chamber is optimum temperature, less than the fusion that this temperature range is unfavorable for later stage addO-on therapy, to each
Individual link temperature, the accurate assurance of time, proportioning, the precoated sand final product quality of output is high in this case, and each time
The product quality of section is stable.
Described above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement and
Modification, these improvement and modification also should be regarded as protection scope of the present invention.
Claims (8)
- A kind of 1. dustless processing technology of precoated sand and preparation method thereof, it is characterised in that：Step 1：Entering three kinds of sand of sand stage weighing, iron sand, SEMEN AMOMI LONGILIGULA, Fujian sand, by sensor respectively by the weight of three kinds of sand Amount data-signal is sent to controller, and the controller is controlled into sand warehouse valve switch, and three kinds of sand are entered successively with scheduled timing Row weighs, and three kinds of sand of control enter sand amount；Step 2：Three kinds of sand are preheated using waste hot gas in pre- storage；Step 3：Heating chamber automatic ignition heats to three kinds of sand for entering the heating chamber；Added in heating chamber using direct-injection Mixed sand is spread in heat, the sand device rotation point of raising in heating chamber；Step 4：Mixed sand enters puddle mixer, the mixed sand addition bentonite into puddle mixer, 30 seconds after the completion of bentonite addition Interior addition resin, graphite is added in 50 seconds after adding resin, curing agent is added in 80 seconds after adding graphite；Step 5：Multi-layer vibration crushing, echelon filtering are carried out to mixed sand；Step 6：The mixed sand filtered cools down into roller, and drums inside cools down by screw feeding and conveys finished product, then Packed after being lifted by elevator.
- 2. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The puddle mixer After interior mixed sand mixing, dry and dry twice；1) the blowing duration is 15 seconds for the first time；2) it is spaced 20 seconds between first time blowing and second are dried, calcium powder was added for the first time in 20 seconds；3) second of blowing duration is 70 seconds；4) calcium powder is added for the second time when temperature is reduced to 80 degree.
- 3. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The mixed sand Weight is 700 kilograms, and the part by weight parameter of three kinds of sand is iron sand 8%, SEMEN AMOMI LONGILIGULA 46%, Fujian sand 46%.
- 4. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The pre- storage Preheating temperature be 15~40 degree, the time that three kinds of sand enter heating chamber is 90 seconds.
- 5. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The heating chamber Heating-up temperature be 110~120 degree, the rotation of sand device raised after 90 seconds heat times divide and spread mixed sand.
- 6. dustless processing technology of precoated sand according to claim 3 and preparation method thereof, it is characterised in that：The bentonite For 100~350 grams；The resin is 9.80~20.65 kilograms；The graphite is 0.8~3.6 kilogram.
- 7. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The curing agent For methenamine solution, the mass ratio of methenamine and water is 1: 2.
- 8. dustless processing technology of precoated sand according to claim 1 and preparation method thereof, it is characterised in that：The first time It is the 0.06% of weight resin that calcium powder, which is added, with second of calcium powder weight total amount for adding calcium powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710620909.0A CN107377864A (en) | 2017-07-25 | 2017-07-25 | Dustless processing technology of precoated sand and preparation method thereof |
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| CN201710620909.0A CN107377864A (en) | 2017-07-25 | 2017-07-25 | Dustless processing technology of precoated sand and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108326227A (en) * | 2017-12-29 | 2018-07-27 | 魏龙飞 | A kind of mechanical gear surface coating technique |
| CN111266522A (en) * | 2020-04-16 | 2020-06-12 | 临海市华远石英砂有限公司 | Precoated sand production device and production method thereof |
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| CN111266522A (en) * | 2020-04-16 | 2020-06-12 | 临海市华远石英砂有限公司 | Precoated sand production device and production method thereof |
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Application publication date: 20171124 |