CN112921748B - Production mixing ratio debugging method for dynamic balance of intermittent asphalt mixing station - Google Patents
Production mixing ratio debugging method for dynamic balance of intermittent asphalt mixing station Download PDFInfo
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- CN112921748B CN112921748B CN202110134304.7A CN202110134304A CN112921748B CN 112921748 B CN112921748 B CN 112921748B CN 202110134304 A CN202110134304 A CN 202110134304A CN 112921748 B CN112921748 B CN 112921748B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
- E01C19/1068—Supplying or proportioning the ingredients
- E01C19/1072—Supplying or proportioning the ingredients the solid ingredients
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/08—Apparatus for transporting and heating or melting asphalt, bitumen, tar, or the like
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
- E01C19/1063—Controlling the operations
Abstract
The invention discloses a production mix proportion debugging method for dynamic balance of an intermittent asphalt mixing station, belonging to the field of road engineering, aiming at solving the technical problem of avoiding the disjointing phenomenon of the production mix proportion of an asphalt mixture and a target mix proportion, and adopting the technical scheme that: the method comprises the following specific steps: s1, calibrating the rotating speed of a small belt of a cold material bin: determining the relation between the rotating speed of the small belt of each cold material bin and the flow of the cold material bin through calibration; s2, determining the proportion of cold aggregate; s3, configuring a screen of a mixing station; s4, calculating the flow required by each grade of cold aggregate; s5, calculating the rotating speed of the small belt of the cold storage bin; s6, determining aggregate feeding proportion of each hot material bin; s7, determining the production grading debugging proportion; and S8, verifying the technical indexes of the production mix proportion.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a production mixing ratio debugging method for dynamic balance of an intermittent asphalt mixing station.
Background
At present, the highway and all grades of highways mainly adopt asphalt pavements, and the quality of asphalt mixture directly influences the quality of paved pavements. At present, batch mixing equipment is mostly adopted in the production of asphalt mixtures, and a secondary screening system of a hot material bin can slow down the influence of raw material fluctuation on the mixture gradation to a great extent. However, in the actual production process, the asphalt mixing station is strict in controlling the proportion of the hot material bin, the problem of the balance stability between the cold material feeding system and the hot material production system is not fully considered, and the phenomena of material waiting and material overflowing are easy to occur in the actual production process, so that the matching between the production gradation of the mixture and the target mixing ratio design gradation is poor, and the performance of the mixture is influenced; on the other hand, the production capacity of the mixing station is greatly reduced, and the project schedule is influenced.
Therefore, how to avoid the disjointing phenomenon between the production mix proportion of the asphalt mixture and the target mix proportion is a technical problem to be solved urgently at present.
Disclosure of Invention
The technical task of the invention is to provide a dynamic balance production mix proportion debugging method for an intermittent asphalt mixing station, which is used for solving the problem of disjointing of the production mix proportion of an asphalt mixture and a target mix proportion.
The technical task of the invention is realized in the following way, and the method for debugging the dynamic balance production mix proportion of the intermittent asphalt mixing station specifically comprises the following steps:
s1, calibrating the rotating speed (frequency) of a small belt of a cold material bin: determining the relation between the rotating speed (frequency) of the small belt of each cold material bin and the flow of the cold material bin through calibration; the method comprises the following specific steps:
s101, measuring the rotating speed of a large belt (flat belt) by using a stopwatch and a paint spraying tool, intercepting the belt with a specified length on the large belt, and calculating the time t required for rotating the belt with the specified length, wherein the formula is as follows:
wherein t represents time in units of s; v represents the rotation speed of the large belt (flat belt) in m/s; l represents the length intercepted on the large belt (flat belt) and has the unit of m;
s102, fixing the opening degree of the discharge hole of each cold storage bin, selecting 3 rotating speeds of the small belt according to an equal proportion or application interval principle, respectively discharging for 2-3 times at each rotating speed, wherein the discharge time is more than 3min each time, and then simultaneously stopping the large belt pulley and the small belt pulley;
s103, collecting all aggregates in the length cut by the large belt, respectively carrying out tests of weighing, screening and moisture content measurement, and calculating an average value;
s104, calculating the flow a of each cold storage bin at different rotating speeds (frequencies), wherein the formula is as follows:
wherein a represents the aggregate flow of the cold storage bin, and the unit is t/h; t represents the time required by the rotation of the large belt for intercepting the length, and the unit is s; m represents the aggregate mass in kg within the interception length; omega represents the water content of the aggregate, and the unit is%;
s105, carrying out linear regression analysis on the two parameters of the rotating speed (frequency) and the flow to obtain a regression equation of each cold storage bin, wherein the formula is as follows:
y＝Nx+M；
wherein x represents the feeding speed or frequency displayed by the control room; y represents the actual flow rate and has the unit of t/h; n and M both represent constants;
s106, when the aggregate loaded in the cold storage bin changes, introducing a material coefficient c, wherein the coefficient is the ratio of the bulk density of the new material to the bulk density of the raw material, and the formula is as follows:
wherein m is 1 The unit of the sum of the mass of a container used by the original aggregate and the mass of the loose aggregate is g; m is 2 Representing the sum of the mass of the container used by the new aggregate and the loose aggregate, and the unit is g; m is 0 Representing the mass of a container used by the raw aggregate, and the unit is g; m' 0 Representing the mass of the container used for the new aggregate, and the unit is g; v 1 Represents the volume of the container used by the raw aggregate, unit mL; v 2 Representing the volume of the container used for new aggregates, with the unit of mL;
s2, determining the proportion of cold aggregates;
s3, configuring a screen of a mixing station;
s4, calculating the flow required by each grade of cold aggregate;
s5, calculating the rotating speed (frequency) of the small belt of the cold storage bin;
s6, determining aggregate feeding proportion of each hot material bin;
s7, determining the production grading debugging proportion;
and S8, verifying the technical indexes of the production mix proportion.
Preferably, the length of the belt cut from the large belt in the step S101 is greater than or equal to 2m;
in the step S1, in the process of calibrating the rotating speed (frequency) of the small belt of the cold storage bin, the grade aggregate with the size of 3-5mm is fixed in the cold storage bin, and the opening width or height of the discharge port is reduced to 1/3-1/2 of the total opening.
Preferably, the determination of cold aggregate proportion in step S2 is as follows:
and (4) grading synthesis is carried out according to the screening of each grade of cold aggregate obtained in the step (S1), and the allowable deviation of the synthetic grading key sieve aperture passing rate and the target mixing ratio grading key sieve aperture passing rate is 4.75mm (+ -5%), 2.36mm (+ -4%) and 0.075mm (+ -2%).
Preferably, the configuration of the screen of the mixing station in step S3 is specifically as follows:
the method is characterized in that the key sieve pore control of the asphalt mixture is used as a principle, the production gradation is stable, the size of a screen of a hot material bin is selected, and the size of the screen sequentially from small to large: 3 to 4 multiplied by 3 to 4, 5 to 6 multiplied by 5 to 6, 11 to 12 multiplied by 11 to 12, 16 to 18 multiplied by 16 to 18, 22 to 24 multiplied by 22 to 24, and 30 to 36 multiplied by 30 to 36; wherein the size unit of the screen is mm.
Preferably, the flow rate required by each grade of cold aggregate calculated in the step S4 is specifically as follows:
calculating the flow A (t/h) required by each grade of cold aggregate under the planned hourly output of the mixing station according to the following formula:
wherein A represents flow rate, and the unit is t/h; p represents planned yield of the mixing station, and the unit is t/h; p b Represents the amount of asphalt used in units of%; k represents the synthetic proportion of the cold aggregate of each grade and has a unit of%.
Preferably, the rotating speed (frequency) of the small belt of the cooling bin is calculated in the step S5 as follows:
s501, according to the flow of each grade of cold aggregate determined in the step S4, calculating to obtain the small belt rotating speed (frequency) of each cold aggregate bin by combining the flow of each cold aggregate bin obtained in the step S1 and a small belt rotating speed (frequency) regression equation;
s502, calculating whether the rotating speed (frequency) is 20% -80% of the total range:
if not, adjusting the opening width or height of the discharge port, and repeating the step S1, the step S4 and the step S5 until the requirements are met;
wherein, the condition of adjusting the opening width or height of the discharge hole is shown in the following table:
the condition of adjusting the opening width or height of the discharge port according to the table is as follows:
(1) when the percentage of the rotating speed (frequency) of the cold material bin in the total measuring range is less than or equal to 10%, adjusting the discharge port to 1/3 of the original opening width or height;
(2) when the rotating speed (frequency) of the cold material bin accounts for 10-20% of the total range, adjusting the discharge port to 1/2 of the original opening width or height;
(3) when the percentage of the rotating speed (frequency) of the cold material bin in the total measuring range is between 80% and 90%, adjusting the discharge hole to 1.5 times of the original opening width or height;
(4) and when the percentage of the rotating speed (frequency) of the cold material bin in the total range is more than or equal to 90%, adjusting the discharge port to 2 times of the original opening width or height.
Preferably, the step S6 specifically determines the aggregate feeding ratio of each hot bin as follows:
s601, the mixing station normally feeds materials for at least 20 minutes according to the rotating speed (frequency) of the small belt of each cold storage bin determined in the step S5;
s602, stopping feeding of the cold material bins at the same time, and allowing all cold aggregate to enter the hot material bins through a drying roller and screening;
s603, emptying the hot material bins respectively, weighing the hot material bins one by one, and calculating the percentage of the aggregate mass of each bin to the total mass, namely the feeding proportion of the aggregate of each hot material bin;
wherein, the feeding time is prolonged until any hot material bin has a flash, and then the hot material bins are respectively emptied and weighed one by one; or further prolonging the feeding time, discharging the materials in each hot material bin continuously, collecting and weighing the materials in different bins by using a plurality of transport vehicles, and accumulating the materials step by step.
Preferably, the step S7 determines the production gradation debugging ratio as follows:
s701, taking each hot aggregate bin aggregate to perform a screening test to determine the grading of the aggregate;
s702, synthesizing hot material grading according to the feeding proportion of the aggregate in each hot material bin obtained in the step S6, wherein the allowable deviation of the synthetic grading key sieve pore passing rate and the target mixing proportion grading key sieve pore passing rate is 4.75mm (+/-5%), 2.36mm (+/-4%) and 0.075mm (+/-2%);
s703, judging whether the allowable deviation range of the synthetic grading key sieve pore passage rate and the target mix proportion grading key sieve pore passage rate exceeds 4.75mm (+/-5%), 2.36mm (+/-4%) and 0.075mm (+/-2%):
if yes, adjusting the proportion of the cold aggregate, and repeating the steps S4, S5, S6 and S7 until the deviation of the synthetic gradation of the hot aggregate in the hot aggregate bin and the target mixing proportion gradation meets the requirement of allowable deviation;
wherein, the proportion of the cold aggregate is adjusted as shown in the following table:
according to the above table, the cold aggregate proportion is adjusted as follows:
when the deviation value delta x of a 4.75mm sieve pore is less than-5 percent, the following situations are included:
(1) When the deviation value delta x of the sieve pore of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase;
(2) and 3-5mm cold aggregate: the change is not changed;
(3) 5-10mm cold aggregate: a reduction amount;
(4) cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
(2) When the deviation value of a sieve pore of 2.36mm is more than or equal to minus 4% and less than or equal to delta x is less than or equal to 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: the change is not changed;
(2) and 3-5mm cold aggregate: an increase;
(3) 5-10mm cold aggregate: a reduction amount;
(4) and cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase;
(2) and 3-5mm cold aggregate: an increase;
(3) 5-10mm cold aggregate: a reduction amount;
(4) and cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
(II) when the deviation value delta x of the sieve holes with the size of 4.75mm is more than 5%, the following conditions are included:
(1) When the deviation value delta x of the sieve pores of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase amount;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: an increase;
(4) cold aggregate of 10-15mm or 10-20 mm: an increase amount;
(2) When the deviation value of a sieve pore of 2.36mm is more than or equal to minus 4% and less than or equal to delta x is less than or equal to 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: the change is not changed;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: an increase amount;
(4) cold aggregate of 10-15mm or 10-20 mm: an increase amount;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: a reduction amount;
(2) and 3-5mm cold aggregate: keeping the original shape;
(3) 5-10mm cold aggregate: an increase amount;
(4) and cold aggregate of 10-15mm or 10-20 mm: an increase amount;
(III) when the deviation value of the 4.75mm sieve pore is-5% to delta x 5%, the following conditions are included:
(1) When the deviation value delta x of the sieve pores of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase amount;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: keeping the original shape;
(4) cold aggregate of 10-15mm or 10-20 mm: the change is not changed;
(2) When the deviation value of a sieve pore of 2.36mm is more than or equal to minus 4% and less than or equal to delta x is less than or equal to 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: keeping the original shape;
(2) and 3-5mm cold aggregate: the change is not changed;
(3) 5-10mm cold aggregate: keeping the original shape;
(4) and cold aggregate of 10-15mm or 10-20 mm: keeping the original shape;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: a reduction amount;
(2) and 3-5mm cold aggregate: an increase amount;
(3) 5-10mm cold aggregate: keeping the original shape;
(4) and cold aggregate of 10-15mm or 10-20 mm: the change is not changed;
the deviation value delta x is the difference between the hot aggregate synthetic grading sieve mesh passing rate and the target mix proportion grading sieve mesh passing rate, namely delta x = hot aggregate grading sieve mesh passing rate-target mix proportion grading sieve mesh passing rate;
and (IV) aiming at the passing rate of a sieve pore of 0.075mm, adjusting by using the using amount of the filler.
Preferably, the step S7 determines the production grading debugging ratio as follows:
and (3) synthesizing hot material gradation according to the feeding proportion of aggregates in the hot material bin, wherein the allowable deviation of the synthetic gradation key sieve pore passing rate and the target mixing proportion gradation key sieve pore passing rate is optimally controlled to be 4.75mm (+/-2%), 2.36mm (+/-2%) and 0.075mm (+/-1%).
Preferably, the verification of the technical index of the production mix proportion in the step S8 is as follows:
and (4) collecting aggregates of each hot aggregate bin, and performing volume index and road performance tests respectively according to the production gradation debugging proportion determined in the step (S7).
The method for debugging the dynamic balance production mix proportion of the intermittent asphalt mixing station has the following advantages:
the invention effectively solves the problem that the production mix proportion of the asphalt mixture and the target mix proportion are disjointed to a certain extent, so that the production gradation of the mixture is as close to the target design gradation as possible, the variability of key sieve pores is reduced, the performance quality of the mixture is stabilized, and the yield of a mixing station is improved;
the mixing station adopts a dynamic balance debugging mode, so that the matching of the production mix proportion of the asphalt mixture and the target mix proportion is effectively controlled, the variability of the mineral aggregate gradation of the asphalt mixture is reduced, and the stability of the performance of the mixture is ensured;
by calibrating the cold material bin metering system, the phenomena of material waiting and material overflowing in the production process of the mixing station are effectively reduced, and the yield of the mixing station is improved;
and (IV) aiming at the fluctuation of raw materials in the actual production process, a feasible adjustment basis is provided, and the production precision and stability of the asphalt mixing station are improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a flow calibration curve.
Detailed Description
The dynamic balance production mix adjustment method of the batch asphalt mixing station of the present invention is described in detail below with reference to the drawings and specific examples.
Example 1:
taking a surface layer asphalt mixture AC-20C in a certain highway as an example, the method for debugging the dynamic balance production mix proportion of the intermittent asphalt mixing station comprises the following specific steps:
(1) And calibrating the rotating speed (frequency) of the small belt of the cold material bin: determining a relation curve and a regression equation of the flow of each cold material bin and the frequency of the small belt, taking the 5# bin as an example to determine the regression curve and the equation, and the following table shows that:
the aggregate specification and flow regression equation corresponding to each cold silo is shown in the following table:
| number of cold stock bin | Aggregate size/mm | Formula for calibrating flow |
| 5# | 10-20 | y＝c(1.7276x-0.3046) |
| 4# | 10-15 | y＝c(1.1348x-0.8715) |
| 3# | 5-10 | y＝c(1.7562x-1.2046) |
| 2# | 3-5 | y＝c(0.7949x-1.4894) |
| 1# | 0-3 | y＝c(1.7489x+0.5989) |
In the table, x-control room shows the feeding frequency (Hz); y-actual flow (t/h); c is the coefficient of material, when the material in a certain cold storage bin is changed, the coefficient is the ratio of the bulk density of the new material to the bulk density of the raw material, and the aggregate of each cold storage bin is calibrated to be unchanged, so that c =1.
(2) Determining the proportion of cold aggregate: aggregate intercepted from the big belt is subjected to a screening test, and cold aggregate synthesis is carried out according to a target mix proportion, so that the allowable deviation of the synthetic grading key sieve pore passage rate and the target mix proportion grading key sieve pore passage rate meets the requirement, and the 3AC-20C cold aggregate synthetic grading is shown in the following table:
(3) Selecting a screen of a mixing station: according to the grading range of the AC-20C mixture and the key sieve pore control principle, 5 screens of 3mm multiplied by 4mm, 6mm multiplied by 6mm, 11mm multiplied by 11mm, 16mm multiplied by 16mm and 22mm multiplied by 22mm are selected in total.
(4) Calculating the flow required by each grade of cold aggregate and the small belt frequency of each cold aggregate bin according to the determined cold aggregate proportion, the planned yield of the mixing station and the regression equation of the flow of each cold aggregate bin and the small belt frequency; the parameters of each cold silo are set as shown in the following table:
| cold material bin | Aggregate specification (mm) | Ratio (%) | Flow (t/h) | Production frequency (Hz) |
| 5# | 10-20 | 31 | 83.15 | 48 |
| 4# | 10-15 | 17 | 45.60 | 41 |
| 3# | 5-10 | 18 | 48.28 | 28 |
| 2# | 3-5 | 6 | 16.09 | 22 |
| 1# | 0-3 | 26 | 69.74 | 39 |
Wherein the planned yield is controlled according to 280t/h, and the consumption of asphalt is 4.2 percent.
(5) Determining the feeding proportion of aggregate in each hot aggregate bin: after the continuous production is carried out for 20min according to the feeding frequency of each cold material bin determined by the table set by the parameters of each cold material bin, emptying each hot material bin, weighing the hot material bins one by one, and calculating the percentage of the aggregate mass of each bin to the total mass, namely the feeding proportion of the aggregate of each hot material bin is as follows: 16-22mm:11-16mm:6-11mm:3-6mm:0 to 3mm =19%:25%:20%:8%:26 percent.
(6) And (3) sampling hot materials of each grade for 3 times, respectively screening to obtain an average value, carrying out grading synthesis according to the hot material screening result and the feeding proportion obtained in the step (5), and carrying out comparative analysis on the grading synthesis and the target grading, wherein the production grading debugging result is shown in the following table:
(7) The aggregate synthetic grading of the hot aggregate bin and the target mixing proportion grading deviation do not meet the allowable deviation requirement, the cold aggregate proportion is adjusted according to an adjusting method, and the adjusted parameters of each cold aggregate bin are shown in the following table:
| cold storage bin | Aggregate specification (mm) | Ratio (%) | Flow (t/h) | Production frequency (Hz) |
| 5# | 10-20 | 31 | 83.15 | 48 |
| 4# | 10-15 | 16 | 42.92 | 38 |
| 3# | 5-10 | 17 | 45.60 | 26 |
| 2# | 3-5 | 6 | 16.09 | 22 |
| 1# | 0-3 | 28 | 75.11 | 42 |
(8) Determining the feeding proportion of the aggregate in each hot material bin for the second time: after the feeding frequency is determined by referring to the parameters of the cold material bins for continuous production for 20min, emptying the hot material bins respectively, weighing the hot material bins one by one, and calculating the percentage of the aggregate mass of each bin to the total mass, namely the feeding proportion of the aggregate of each hot material bin is as follows: 16-22mm:11-16mm:6-11mm:3-6mm:0 to 3mm =19%:23%:18%:8%:30 percent;
(9) And (3) performing secondary grading synthesis according to the feeding proportion obtained in the step (8), and performing comparative analysis on the secondary grading synthesis and the target grading, wherein the production grading debugging result is shown in the following table:
(10) And conclusion: the aggregate synthetic grading of the hot aggregate bin for the second time and the target mixing proportion grading deviation meet the requirement of allowable deviation; the mixing station produces according to a plan of 280t/h, and the production frequency of each cold material bin is as follows: 6# (10-20 mm): 5# (10-15 mm): 4# (5-10 mm): 3# (3 to 5 mm): 1# (0 to 3 mm) =48:38:26:22:42, debugging proportion of each hot aggregate bin is as follows: 16-22mm:11-16mm:6-11mm:3-6mm:0-3mm =19%:23%:18%:8%:30 percent; the volume index and the road performance of the mixture are verified according to the production mix proportion debugging result, and the related work of production mix proportion design is further perfected.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A production mix proportion debugging method for dynamic balance of an intermittent asphalt mixing station is characterized by comprising the following steps of:
s1, calibrating the rotating speed of a small belt of a cold material bin: determining the relation between the rotating speed of the small belt of each cold material bin and the flow of the cold material bin through calibration; the method comprises the following specific steps:
s101, measuring the rotating speed of the large belt by using a stopwatch and a paint spraying tool, intercepting the belt with a specified length on the large belt, and calculating the time t required for rotating the belt with the specified length, wherein the formula is as follows:
wherein t represents time in units of s; v represents the rotation speed of the large belt, and the unit is m/s; l represents the length intercepted on the large belt, and the unit is m;
s102, fixing the opening degree of the discharge hole of each cold storage bin, selecting 3 rotating speeds of the small belt according to an equal proportion or application interval principle, respectively discharging for 2-3 times at each rotating speed, wherein the discharging time is more than 3min each time, and then simultaneously stopping the large belt pulley and the small belt pulley;
s103, collecting all aggregates in the cut length of the large belt, respectively carrying out weighing, screening and water content measurement tests, and averaging;
s104, calculating the flow a of each cold material bin at different rotating speeds, wherein the formula is as follows:
wherein a represents the aggregate flow of the cold storage bin, and the unit is t/h; t represents the time required by the rotation of the large belt for intercepting the length, and the unit is s; m represents the aggregate mass in kg within the interception length; omega represents the water content of the aggregate, and the unit is%;
s105, carrying out linear regression analysis on the two parameters of the rotating speed and the flow to obtain a regression equation of each cold storage bin, wherein the formula is as follows:
y＝Nx+M；
wherein x represents the feeding speed or frequency displayed by the control room; y represents the actual flow rate and has the unit of t/h; n and M both represent constants;
s106, when the aggregate loaded in the cold storage bin changes, introducing a material coefficient c, wherein the coefficient is the ratio of the bulk density of the new material to the bulk density of the raw material, and the formula is as follows:
wherein m is 1 The unit of the sum of the mass of a container used by the original aggregate and the mass of the loose aggregate is g; m is a unit of 2 Representing the sum of the mass of the container used by the new aggregate and the loose aggregate, and the unit is g; m is 0 Representing the mass of a container used by the raw aggregate, and the unit is g; m' 0 Representing the mass of the container used for the new aggregate, and the unit is g; v 1 The volume of the container used for the raw aggregate is expressed in unit mL; v 2 Indicating the volume of the container for the new aggregateThe bit is mL;
s2, determining the proportion of cold aggregates; the method comprises the following specific steps:
grading synthesis is carried out according to screening of each grade of cold aggregate obtained in the step S1, and the allowable deviation of the synthetic grading key sieve pore passing rate and the target mix proportion grading key sieve pore passing rate is 4.75mm (+/-5%), 2.36mm (+/-4%) and 0.075mm (+/-2%);
s3, configuring a screen of a mixing station; the method comprises the following specific steps:
the method is characterized in that the key sieve pore control of the asphalt mixture is used as a principle, the selection of the size of a screen of a hot material bin is carried out by taking the production gradation as a target, and the size of the screen sequentially comprises the following steps: 3 to 4 multiplied by 3 to 4, 5 to 6 multiplied by 5 to 6, 11 to 12 multiplied by 11 to 12, 16 to 18 multiplied by 16 to 18, 22 to 24 multiplied by 22 to 24, and 30 to 36 multiplied by 30 to 36; wherein the size unit of the screen is mm;
s4, calculating the flow required by each grade of cold aggregate; the method comprises the following specific steps:
calculating the flow A (t/h) required by each grade of cold aggregate under the planned hourly output of the mixing station according to the following formula:
wherein A represents flow rate, and the unit is t/h; p represents planned yield of the mixing station, and the unit is t/h; p is b Represents the amount of asphalt in units of%; k represents the synthetic proportion of each grade of cold aggregate, and the unit is%;
s5, calculating the rotating speed of the small belt of the cold storage bin; the method comprises the following specific steps:
s501, calculating the rotating speed of the small belt of each cold material bin according to the flow of each grade of cold aggregate determined in the step S4 and by combining the flow of each cold material bin obtained in the step S1 and a small belt rotating speed regression equation;
s502, calculating whether the rotating speed is 20% -80% of the total range:
if not, adjusting the opening width or height of the discharge port, and repeating the step S1, the step S4 and the step S5 until the requirements are met;
wherein, the condition of adjustment discharge gate opening width or height is specifically as follows:
(1) when the rotating speed of the cold material bin accounts for less than or equal to 10 percent of the total measuring range, adjusting the discharge port to 1/3 of the original opening width or height;
(2) when the rotating speed of the cold material bin accounts for 10-20% of the total measuring range, adjusting the discharge hole to 1/2 of the original opening width or height;
(3) when the percentage of the rotating speed of the cold material bin in the total range is between 80 and 90 percent, adjusting the discharge hole to be 1.5 times of the original opening width or height;
(4) when the rotating speed of the cold material bin accounts for more than or equal to 90 percent of the total measuring range, adjusting the discharge hole to 2 times of the original opening width or height;
s6, determining aggregate feeding proportion of each hot material bin; the method comprises the following specific steps:
s601, the mixing station normally feeds materials for at least 20 minutes according to the rotating speed of the small belt of each cold storage bin determined in the step S5;
s602, stopping feeding of the cold material bins at the same time, and allowing all cold aggregate to enter the hot material bins through a drying roller and screening;
s603, emptying the hot material bins respectively, weighing the hot material bins one by one, and calculating the percentage of the aggregate mass of each bin in the total mass, namely the feeding proportion of the aggregates of each hot material bin;
wherein, the feeding time is prolonged until any hot material bin has a flash, and then the hot material bins are respectively emptied and weighed one by one; or further prolonging the feeding time, discharging materials continuously from each hot material bin, collecting and weighing the materials in different bins by using a plurality of transport vehicles, and accumulating the materials by grade;
s7, determining the production grading debugging proportion; the method comprises the following specific steps:
s701, taking each hot aggregate bin aggregate to perform a screening test to determine the grading of the aggregate;
s702, synthesizing hot material grading according to the feeding proportion of the aggregate in each hot material bin obtained in the step S6, wherein the allowable deviation of the synthetic grading key sieve pore passing rate and the target mixing proportion grading key sieve pore passing rate is 4.75mm (+/-5%), 2.36mm (+/-4%) and 0.075mm (+/-2%);
s703, judging whether the allowable deviation range of the synthetic grading key sieve pore passage rate and the target mix proportion grading key sieve pore passage rate exceeds 4.75mm (+/-5%), 2.36mm (+/-4%) and 0.075mm (+/-2%):
if so, adjusting the proportion of the cold aggregate, and repeating the step S4, the step S5, the step S6 and the step S7 until the deviation of the composite gradation of the hot bin aggregate and the target mixing proportion gradation meets the requirement of allowable deviation;
the cold aggregate proportion is adjusted as follows:
when the deviation value delta x of the sieve holes of 4.75mm is less than-5 percent, the following conditions are included:
(1) When the deviation value delta x of the sieve pore of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase amount;
(2) and 3-5mm cold aggregate: the change is not changed;
(3) 5-10mm cold aggregate: a reduction amount;
(4) cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
(2) When the deviation value of the sieve pore of 2.36mm is more than or equal to minus 4 percent and less than or equal to delta x is less than or equal to 4 percent, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: the change is not changed;
(2) and 3-5mm cold aggregate: an increase;
(3) 5-10mm cold aggregate: a reduction amount;
(4) cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase;
(2) and 3-5mm cold aggregate: an increase;
(3) 5-10mm cold aggregate: a reduction amount;
(4) cold aggregate of 10-15mm or 10-20 mm: a reduction amount;
when the deviation value delta x of the sieve pore with 4.75mm is larger than 5 percent, the following situations are included:
(1) When the deviation value delta x of the sieve pores of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: an increase amount;
(4) cold aggregate of 10-15mm or 10-20 mm: an increase amount;
(2) When the deviation value of a sieve pore of 2.36mm is more than or equal to minus 4% and less than or equal to delta x is less than or equal to 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: the change is not changed;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: an increase amount;
(4) cold aggregate of 10-15mm or 10-20 mm: an increase;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: a reduction amount;
(2) and 3-5mm cold aggregate: the change is not changed;
(3) 5-10mm cold aggregate: an increase;
(4) cold aggregate of 10-15mm or 10-20 mm: an increase amount;
(III) when the deviation value of the sieve pore of 4.75mm is more than or equal to minus 5 percent and less than or equal to delta x and less than or equal to 5 percent, the method comprises the following conditions:
(1) When the deviation value delta x of the sieve pores of 2.36mm is less than-4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: an increase amount;
(2) and 3-5mm cold aggregate: a reduction amount;
(3) 5-10mm cold aggregate: the change is not changed;
(4) cold aggregate of 10-15mm or 10-20 mm: the change is not changed;
(2) When the deviation value of a sieve pore of 2.36mm is more than or equal to minus 4% and less than or equal to delta x is less than or equal to 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: the change is not changed;
(2) and 3-5mm cold aggregate: keeping the original shape;
(3) 5-10mm cold aggregate: the change is not changed;
(4) cold aggregate of 10-15mm or 10-20 mm: keeping the original shape;
(3) When the deviation value delta x of the sieve pore of 2.36mm is more than 4%, the adjustment rule of each grade of cold aggregate is as follows:
(1) 0-3mm cold aggregate: a reduction amount;
(2) and 3-5mm cold aggregate: an increase;
(3) 5-10mm cold aggregate: the change is not changed;
(4) cold aggregate of 10-15mm or 10-20 mm: keeping the original shape;
the deviation value delta x is the difference between the hot aggregate synthetic grading sieve mesh passing rate and the target mix proportion grading sieve mesh passing rate, namely delta x = hot aggregate grading sieve mesh passing rate-target mix proportion grading sieve mesh passing rate;
fourthly, aiming at the passing rate of sieve pores with 0.075mm, the using amount of the filler is adjusted;
and S8, verifying the technical indexes of the production mix proportion.
2. The batch asphalt mixing station dynamic balance production mix proportion debugging method according to claim 1, wherein the length of the belt intercepted from the large belt in the step S101 is more than or equal to 2m;
in the step S1, in the process of calibrating the rotating speed of the small belt of the cold storage bin, the grade aggregate with the size of 3-5mm is fixed in the cold storage bin, and the opening width or height of the discharge port is reduced to 1/3-1/2 of the total opening.
3. The batch asphalt mixing station dynamic balance production mix proportion debugging method according to claim 1, wherein the production gradation mix debugging ratio is determined in step S7 as follows:
and (3) synthesizing hot material grading according to the feeding proportion of aggregates in the hot material bin, wherein the allowable deviation of the synthetic grading key sieve pore passing rate and the target mixing proportion grading key sieve pore passing rate is optimally controlled to be 4.75mm (+/-2%), 2.36mm (+/-2%) and 0.075mm (+/-1%).
4. The batch asphalt mixing station dynamic balance production mix proportion debugging method according to claim 1, wherein the production mix proportion technical index verification in step S8 is as follows:
and (5) taking aggregates of each hot material bin, and respectively carrying out volume index and road performance tests according to the production gradation debugging proportion determined in the step S7.
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| CN104594160A (en) * | 2014-12-22 | 2015-05-06 | 长安大学 | Normalized design method of production mix proportion and target mix proportion of bituminous mixture |
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