CN111877090A - Powder feeding system of continuous asphalt mixture stirring equipment and control method - Google Patents
Powder feeding system of continuous asphalt mixture stirring equipment and control method Download PDFInfo
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- CN111877090A CN111877090A CN202010535016.8A CN202010535016A CN111877090A CN 111877090 A CN111877090 A CN 111877090A CN 202010535016 A CN202010535016 A CN 202010535016A CN 111877090 A CN111877090 A CN 111877090A
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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
- E01C19/1009—Plant wherein type or construction of the mixer are irrelevant
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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
- E01C19/1063—Controlling the operations
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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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- Road Paving Machines (AREA)
Abstract
The invention provides a powder feeding system of continuous asphalt mixture stirring equipment and a control method thereof, wherein a powder tank, a transition scale, a spiral scale, a lifter spiral and an aggregate lifter are arranged; determining a weight interval of the transitional powder weighing, and starting an arch breaking electric valve to automatically break an arch according to the weight interval and the real-time weight of the transitional powder weighing to supplement powder; the transition scale starts a transition scale screw according to the delay time delay, adjusts the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveys the powder in the transition scale to the screw scale; the powder in the spiral scale enters the aggregate elevator through the elevator in a spiral mode, and enters the stirring cylinder after being mixed with the aggregate in the aggregate elevator, so that the control accuracy of the powder can be improved, the stability of a feeding system is high, and waste materials can be reduced.
Description
Technical Field
The invention relates to the technical field of asphalt production equipment, in particular to a powder feeding system of continuous asphalt mixture stirring equipment and a control method.
Background
The existing asphalt mixture stirring equipment can be divided into an intermittent type and a continuous type according to the stirring working mode, the requirement of the continuous type asphalt mixture stirring equipment on raw materials is high, and the specifications of the raw materials must be uniform. With the development of the engineering machinery industry, the aggregate shaping machine and the crushing and screening machine are quite mature, and qualified raw materials are easily obtained. Because each part of the continuous asphalt mixture stirring equipment is stably loaded and has no complex and repeated actions, the reliability, the service life and the failure rate of the continuous asphalt mixture stirring equipment are greatly superior to those of the intermittent asphalt mixture stirring equipment. The output of the continuous asphalt mixture stirring equipment is stable, finished products with the output can be produced by giving the raw materials with the output, the stable output provides stable logistics guarantee for the whole road construction project, the output of the intermittent asphalt mixture stirring equipment depends on many factors, such as whether the raw materials are matched with a screen, the metering period of the equipment, the stirring period of the equipment, the trolley material conveying period of the equipment, the capacity of a stirring cylinder, the production formula and the like, the output is difficult to control, and once the control is improper, material overflow can be caused, so that the waste of materials and energy is caused, and the workload of workers is increased.
The feeding system of the continuous asphalt mixture stirring equipment mainly comprises an aggregate feeding system, an asphalt feeding system, a powder feeding system, a solid additive feeding system, a liquid additive feeding system and the like, however, the powder feeding system and the control method of the existing continuous asphalt mixture stirring equipment have poor accuracy of powder control, and in addition, the stability of the powder feeding system is poor, and the problem of more waste materials cannot be solved.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the present invention provides a powder feeding system and a control method for a continuous asphalt mixing plant, which can improve the accuracy of powder control, have high stability of the feeding system, and reduce the generation of waste materials.
(II) technical scheme
In order to achieve the purpose, the invention adopts a technical scheme that:
the powder feeding system of the continuous asphalt mixture stirring equipment comprises a powder tank, a transition scale, a spiral scale, a lifter spiral and an aggregate lifter;
and the powder in the powder tank enters the aggregate elevator in a spiral mode through the transition scale, the spiral scale and the elevator in sequence, is mixed with the aggregate in the aggregate elevator and then enters the stirring cylinder.
In order to achieve the purpose, the invention adopts a technical scheme that:
the powder feeding control method of the continuous asphalt mixture stirring equipment comprises the following steps:
s1, determining a weight interval of the transitional powder weighing, and starting an arch breaking electric valve to automatically break an arch according to the weight interval and the real-time weight of the transitional powder weighing to supplement powder;
s2, starting a transition scale screw by the transition scale according to the delay time delay, adjusting the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveying the powder in the transition scale to the screw scale;
and S3, feeding the powder in the spiral scale into an aggregate elevator through an elevator spiral, mixing the powder with the aggregate in the aggregate elevator, and feeding the mixture into a stirring cylinder.
(III) advantageous effects
The invention has the beneficial effects that: by arranging a powder tank, a transition scale, a spiral scale, a lifter spiral and an aggregate lifter; determining a weight interval of the transitional powder weighing, and starting an arch breaking electric valve to automatically break an arch according to the weight interval and the real-time weight of the transitional powder weighing to supplement powder; the transition scale starts a transition scale screw according to the delay time delay, adjusts the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveys the powder in the transition scale to the screw scale; the powder in the spiral scale enters the aggregate elevator through the elevator in a spiral mode, and enters the stirring cylinder after being mixed with the aggregate in the aggregate elevator, so that the control accuracy of the powder can be improved, the stability of a feeding system is high, and waste materials can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a powder feeding system of a continuous asphalt mixing plant according to an embodiment of the present invention;
FIG. 2 is a flow chart of a powder feeding control method of the continuous asphalt mixing plant according to the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the relationship between the transition weighing capacity and the flow rate according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a transition scale weight versus flow curve according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a transition scale weight versus flow rate according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the rated flow and upper and lower limits of a transition scale spiral according to an embodiment of the present invention;
FIG. 7 is a schematic view illustrating an automatic adjustment principle of a powder feeding control method of a continuous asphalt mixing plant according to an embodiment of the present invention.
[ description of reference ]
1: a powder tank; 2: an arch breaking electric valve; 3: a differential pressure gauge; 4: a breathable cap; 5: the transition is called spiral; 6: a spiral scale; 7: a second load cell; 8: a hoist is screwed; 9: an aggregate elevator; 10: a butterfly valve; 11: an impeller feeder; 12: a first weighing sensor; 13: transition weighing; 14: transition weighing weights; 15: and (5) checking the balance weight.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example one
Referring to fig. 1, a powder feeding system of a continuous asphalt mixture stirring device comprises a powder tank 1, a transition scale 13, a spiral scale 6, a lifter screw 8 and an aggregate lifter 9;
the powder in the powder tank 1 sequentially passes through the transition scale 13, the spiral scale 6 and the elevator spiral 8 to enter the aggregate elevator 9, and then is mixed with the aggregate in the aggregate elevator 9 and then enters the stirring cylinder.
Specifically, the mixture is mixed with the aggregate in the aggregate elevator 9, preheated by the aggregate, and then fed into the continuous stirring cylinder together with the aggregate.
Compared with the direct feeding of the powder into the stirring cylinder, the direct feeding of the powder into the stirring cylinder can cause the negative pressure of the stirring cylinder to increase, is not beneficial to the negative pressure control of the stirring cylinder and has poor environmental protection performance; the powder temperature is lower, and normal atmospheric temperature powder mixes with pitch, can cause partial pitch temperature to reduce rapidly, and pitch temperature reduction will influence the quality of bituminous mixture, and the powder is exported to aggregate lifting machine 9 and can be avoided above problem completely.
The bottom of the powder tank 1 is provided with an arch breaking electric valve 2 and a butterfly valve 10;
an impeller feeder 11 is arranged below the butterfly valve 10;
the powder in the powder tank 1 is conveyed to the transition scale 13 through the butterfly valve 10 and the impeller feeder 11 in sequence.
Specifically, the arch breaking electric valve 2 is arranged on the side wall of the bottom of the powder tank 1 and is used for maintaining the air pressure at the bottom of the powder tank 1 and preventing the arch from forming;
the transition scale 13 is provided with a ventilation cap 4, a pressure difference meter 3 and a first weighing sensor 12;
the bottom of the transition scale 13 is provided with a transition scale weight 14.
Specifically, the ventilation cap 4 is used for keeping the pressure of the transition scale consistent with the atmospheric pressure, the pressure difference meter 3 is used for detecting the pressure state of the transition scale, namely whether the transition scale is in a positive pressure state or a negative pressure state, a transition scale weight is suspended at the bottom of the transition scale, and the transition scale weight is controlled by a cylinder and is used for starting up dynamic scale checking operation;
the bottom of the transition scale 13 is also provided with a transition scale screw 5, the transition scale screw 5 adopts frequency conversion control and an encoder to measure speed, and the transition scale screw 5 is used for quantitatively conveying powder in the transition scale 13 to the screw scale 6.
The spiral scale 6 is supported by a bearing, the other end of the spiral scale is connected with a second weighing sensor 7, and the second weighing sensor 7 is used for detecting the weight of powder in the spiral scale 6 in real time.
Specifically, a scale testing weight 15 is arranged under the spiral scale 6 and is controlled by a cylinder, and the cylinder is used for starting up and dynamically testing the scale operation.
Example two
Referring to fig. 2, the powder feeding control method of the continuous asphalt mixing plant includes the steps of:
s1, determining a weight interval of the transitional powder weighing, and starting an arch breaking electric valve to automatically break an arch according to the weight interval and the real-time weight of the transitional powder weighing to supplement powder;
step S1 specifically includes:
s11, determining the weight interval of the transition powder weighing according to the powder flow;
and S12, when the real-time weight of the transitional powder weighing material is lower than the weight interval, starting an arch breaking electric valve, automatically breaking an arch according to pulse time and pulse interval to supplement powder, and when the real-time weight of the transitional powder weighing material is higher than the weight interval, automatically breaking the arch and stopping.
S2, starting a transition scale screw by the transition scale according to the delay time delay, adjusting the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveying the powder in the transition scale to the screw scale;
step S2 specifically includes:
s21, starting a transition scale spiral by the transition scale according to the delay time delay, and determining the preset rotating speed of the transition scale spiral according to the weight interval;
s22, when the rotating speed of the transition scale screw reaches a preset rotating speed, adjusting the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveying the powder in the transition scale to the screw scale.
And S3, feeding the powder in the spiral scale into an aggregate elevator through an elevator spiral, mixing the powder with the aggregate in the aggregate elevator, and feeding the mixture into a stirring cylinder.
EXAMPLE III
The difference between this embodiment and the second embodiment is that this embodiment will further explain how the powder feeding control method of the continuous asphalt mixture stirring apparatus of the present invention is implemented by combining specific application scenarios:
the height and the volume of the transition scale are limited, the material is supplemented in real time during production, and the density change of the powder is very small, so the influence of the density on the flow of the powder is very small and can be ignored.
Firstly, before production, the whole powder system is debugged.
Firstly, checking the spiral scale and the transition scale by using a standard weight, pulling up the check weight and the transition scale weight of the spiral scale by using an air cylinder after the check of the scale is finished, determining the weight of the check weight and the transition scale weight, and determining the allowable error weight of the check weight and the transition scale weight.
Secondly, determining the relation between the material level and the powder flow.
The transition scale adopts a first weighing sensor to display the material level in real time, the relationship between the material level and the powder flow is the relationship between the weight of the transition scale and the powder flow, the upper limit of the capacity of the transition scale is firstly determined, a butterfly valve and an impeller feeder are opened on the assumption that the upper limit is 1200kg, the butterfly valve and the impeller feeder are closed after the powder of the transition scale is added to 1200kg, an air permeable cap is opened at the same time, the air pressure in the transition scale is kept consistent with the atmospheric pressure, then an aggregate elevator, an elevator spiral and a spiral scale are opened, the transition scale spiral is opened at a fixed speed through a frequency converter after the parts are opened stably, and when the speed displayed by an encoder is stable, the weight of the transition scale is recorded every 5s, and a curve is drawn.
In fig. 3, it can be found that the relationship between the brown line in the curve and the change of the transition scale weight at the constant rotation speed of the transition scale screw is a curve, the slope of the brown line is the flow rate of the transition scale screw, and the curve indicates that the flow rate of the transition scale screw at the constant rotation speed is changed along with the weight of the transition scale powder. Then, the curve is divided into a broken line, as shown in fig. 4, the broken line is composed of three straight lines, and the divided broken line is exactly matched with the curve. In actual production, the weight of the transition scale can be controlled to a certain range according to the required powder flow. For example: the production needs a large amount of powder, the weight of the transition balance powder is kept between 520-900kg, and if the proper powder is needed, the weight of the transition balance powder is controlled between 380-520kg, and if a small amount of powder is needed, the weight of the transition balance powder is controlled between 180-520 kg.
Thirdly, checking the flow of the spiral balance.
First, as shown in fig. 5, the position G0 is the center of gravity of the spiral scale, G0 is the weight of the spiral scale when the spiral scale is empty, L0 is the moment arm of the center of gravity of the spiral scale, F1 is the weight displayed by the second load cell at that time, and L3 is the moment arm thereof, where F1 × L3 is G0 × L0. The powder is uniformly distributed in the spiral scale, the gravity center position of the powder cannot be changed along with the increase of the powder flow in the spiral scale, when the powder flows through the spiral, the gravity center position of the powder is G1, the moment arm of the powder is L1, F2 is the weight displayed by the second weighing sensor at the moment, L3 is the moment arm of the powder, F3 is L3-G3 + G3-L3, namely F3 is L3-F3 + L3, namely (F3-F3) is L3+ G3-L3, and since L3 and L3 are fixed values, F3-F3 and G3 are in a linear relation, namely the spiral display value is F3-F3)/L3 (L3). Because the spiral balance is a constant-speed spiral, the conveying time of the powder from the inlet to the outlet is a constant value t0, the flow rate of the spiral balance is Q0 ═ G1/t0, G1 ═ Q0 ═ t0, F0 ═ Q0 ═ T0 ═ L1)/L3, Q0 ═ F0 ═ L3)/(t0 ═ L1, because t0, L1 and L3 are all constant, k0 is set to be L3/(t0 ═ L1), Q0 ═ k0 ═ F0, and k0 is constant.
Secondly, the aggregate elevator, the elevator screw and the screw scale are started firstly, after the screw scale runs stably, the screw scale is reset, the butterfly valve and the impeller feeder are opened, the butterfly valve and the impeller feeder are closed after the powder of the transition scale is added to 1200kg, the ventilation cap is opened at the same time, the air pressure in the transition scale is kept consistent with the atmospheric pressure, then the transition scale screw is started at a constant speed, after the speed displayed by the encoder is stable, the weight of the transition scale is recorded every 5s, a curve is drawn, and the weight value of the screw scale is recorded in real time. Because the weight displayed by the spiral scale has hysteresis, the time of the powder from the inlet to the outlet of the spiral scale is 4s, because the spiral of the transition scale is very short, when the spiral rotating speed of the transition scale is measured by the encoder to be stable, the time of the powder from the inlet of the spiral scale is 1s, and the time of the change of the rotating speed of the transition scale to the weight of the spiral scale is within 6 s. Calculating the weight of the transition scale between 900 kg-520-. The flow rate Qb of the spiral balance is calculated, and the value of ka between the flow rate Qb of the spiral balance and the display weight Fa of the spiral balance, that is, Qb is ka.
Fourthly, eliminating the influence of the air pressure in the transition scale on the flow.
Because the transition scale is provided with the ventilation cap, the air pressure in the transition scale is basically consistent with the atmospheric pressure in the normal production given process of the transition scale screw, and when the pressure difference meter displays that the pressure exceeds a certain pressure range, the rotating speed is slightly adjusted in advance to control the powder feeding amount and the alarm is given out to prompt the treatment.
Fifthly, when the impeller feeder is opened, a large amount of powder falls from the powder tank, the powder is subjected to external pressure, the given amount of the powder is increased slightly under the rotating speed of the same transition scale screw, the transition scale is in a state of feeding while discharging, the transition scale cannot calculate the powder flow and can only take the flow displayed by the spiral scale as the reference, but the spiral scale has 6s hysteresis, and in order to control the powder flow more accurately, the flow changes when the impeller feeder is debugged for material supplement, and the rotating speed of the transition scale screw is changed in advance in production.
Firstly, installing a ventilation cap, starting an aggregate elevator, an elevator spiral and a spiral scale, resetting after the spiral scale runs stably, starting a transition scale spiral at a constant speed before after the components are started stably, starting the transition scale spiral, and starting a butterfly valve and an impeller feeder after the speed displayed by an encoder is stable, so that the transition scale is in a feeding and discharging state, recording a real-time display value of the spiral scale, comparing the real-time display value with the flow of the spiral scale before, and obtaining a speed regulation coefficient of the impeller feeding in different states under the same flow by repeated tests.
And sixthly, determining the initial flow and the upper and lower limits of the flow regulation.
The spiral rated flow is used as the initial flow, and due to the characteristics of the powder, the spiral rotating speed and the flow of the transition balance are not in a linear relation macroscopically, and as shown in fig. 6, the spiral rated flow is in a positive correlation regional relation, that is, after the moisture content and the particle size of the powder change, the flow corresponding to the same rotating speed is not fixed, but for the same powder, the positive correlation theory of the flow increase is still established along with the increase of the rotating speed. Therefore, automatic adjustment needs to be carried out under the initial flow determination, the adjustment range needs to be set with upper and lower limits, assuming that the screw 100% rotating speed of the transition balance is 45t/h at the rated yield of 380-520kg of the transition balance, the yield is 35-55t/h through a plurality of tests at different rotating speeds, as shown in FIG. 5, we determine the lower limit of 35t/h, and 55t/h is the upper limit, and the purpose of the limit is to prevent the transition adjustment during automatic adjustment caused after mechanical failure.
Seventh, the automatic adjustment method in the production process, the nonlinear adjustment method adopted by the invention, can realize the accurate and rapid adjustment of the powder.
FIG. 6 shows the basic principle of automatic powder adjustment. The upper and lower limits of the flow of the upper and lower black straight lines, and the middle black straight line is the rated flow used when the spiral rotating speed of the transition scale is given for the first time. The green curve is the actual relation between the powder flow and the rotating speed, and has uncertainty due to the change of the water content and the difference of the particle size and shape, but cannot exceed the upper limit and the lower limit. Assuming that the rated yield of the transition balance screw at the speed of 100% is 45t/h, the powder formula is 5% and the total yield is 270t/h, the given flow rate of the powder is 13.5t/h, when the automatic production is carried out, firstly, a straight line given by the rated yield of the screw is adopted for calculation, the abscissa of the point A is the rotating speed of the transition balance screw given for the first time and is 30%, when the screw balance displays stable flow rate, the actually displayed flow rate is the ordinate of the point B, a blue straight line is made by the point B and the origin, the abscissa of the point C is the rotating speed after adjustment, the blue straight line and the green curve are intersected at the point D, when the screw balance displays stable flow rate, the actually displayed flow rate is the ordinate of the point D, if the flow rate error is still outside the allowable error range, a red straight line is made by the point D and the origin, the blue straight line and the green curve are intersected at the point E, and the abscissa of the point E is the, the blue straight line and the green curve are intersected at the point F, when the spiral scale displays stable flow, the actually displayed flow is the ordinate of the point F, the ordinate of the point E is very close to the ordinate of the point F, the flow error requirement is met, and the adjustment is finished.
When the production is started, other motors of the equipment are started firstly, the spiral and the spiral balance of the elevator are started in sequence, after the total current is stable, the start-up scale testing work is executed, the spiral balance idles for 60s and then is reset, the balance testing weights of the spiral balance and the balance testing weights of the transition balance are respectively pulled up through the balance testing air cylinder, the display value is compared with the balance testing weight value when the balance testing weights are pulled up for 60s, the alarm is given after the allowable error is exceeded, the balance testing is finished after the comparison value is 60s, and the accuracy of the spiral balance and the transition balance before the production is ensured.
After the balance is checked, determining the weight interval of the transition balance powder according to the required powder flow, supposing that the weight interval is 380 plus 520kg, automatically supplementing the powder when the real-time weight of the transition balance powder is lower than 380kg, simultaneously starting automatic arch breaking, and breaking the arch according to the set pulse time and pulse interval, so that unsmooth powder discharge caused by negative pressure and arch camber is prevented, the automatic powder supplementing stop when the weight of the transition balance powder reaches 520kg, and simultaneously the automatic arch breaking stop.
After the feeding is started, the transition scale starts the transition scale spiral according to the powder delay time delay, and aggregate, asphalt, mineral powder and additives are ensured to be added into the stirring cylinder at the same time. The starting rotating speed of the transition scale screw is given according to the result of the calculation of the rated rotating speed of the current transition scale powder weight interval, the rotating speed of the transition scale screw is measured through an encoder, the flow automatic adjustment action is executed after the rotating speed is stable, and the rotating speed of the transition scale screw is adjusted according to the real-time flow of the screw scale so as to reach the specified rotating speed. When the pressure difference meter on the transition scale displays positive pressure and exceeds a certain pressure range, the rotating speed is slightly adjusted to be low in advance to control the powder feeding amount and give an alarm to prompt, and when the pressure difference meter on the transition scale displays negative pressure and exceeds a certain pressure range, the rotating speed is slightly adjusted to be high in advance to control the powder feeding amount and give an alarm to prompt. When the impeller feeder is opened, a large amount of powder falls down from the powder tank, the rotating speed of the transition scale screw is reduced in advance according to the change of the flow during material supplementing of the impeller feeder during debugging, the powder accuracy is controlled, and the use requirement of equipment is met.
The invention supports the function of changing the powder formula and the yield in real time, changes the powder formula according to the time when aggregate, asphalt, powder and additive reach the stirring cylinder and according to the set time, and reduces unnecessary discharge when changing the formula and the yield.
When the production is finished, the powder is delayed to stop, so that the asphalt, the aggregate and the mineral powder are ensured to stop entering the stirring cylinder at the same time, and the waste of raw materials is reduced to the maximum extent.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. The powder feeding system of the continuous asphalt mixture stirring equipment is characterized by comprising a powder tank, a transition scale, a spiral scale, a lifter spiral and an aggregate lifter;
and the powder in the powder tank enters the aggregate elevator in a spiral mode through the transition scale, the spiral scale and the elevator in sequence, is mixed with the aggregate in the aggregate elevator and then enters the stirring cylinder.
2. The powder feeding system of the continuous asphalt mixing plant according to claim 1, wherein the bottom of the powder tank is provided with an arch breaking electric valve and a butterfly valve;
an impeller feeder is arranged below the butterfly valve;
and the powder in the powder tank is conveyed to the transition scale through the butterfly valve and the impeller feeder in sequence.
3. The powder feeding system of the continuous asphalt mixing plant according to claim 1, wherein the transition scale is provided with a gas permeable cap, a differential pressure gauge and a first weighing sensor;
and the bottom of the transition scale is provided with a transition scale weight.
4. The powder feeding system of the continuous asphalt mixing plant according to claim 1, wherein a transition scale screw is further provided at the bottom of the transition scale, the transition scale screw is controlled by frequency conversion, and the transition scale screw is used for quantitatively conveying the powder in the transition scale to a screw scale.
5. The powder feeding system of the continuous asphalt mixing plant according to claim 1, wherein the screw scale is supported by bearings, and the other end of the screw scale is connected with a second weighing sensor, and the second weighing sensor is used for detecting the weight of the powder in the screw scale in real time.
6. The powder feeding control method of the continuous asphalt mixture stirring equipment is characterized by comprising the following steps of:
s1, determining a weight interval of the transitional powder weighing, and starting an arch breaking electric valve to automatically break an arch according to the weight interval and the real-time weight of the transitional powder weighing to supplement powder;
s2, starting a transition scale screw by the transition scale according to the delay time delay, adjusting the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveying the powder in the transition scale to the screw scale;
and S3, feeding the powder in the spiral scale into an aggregate elevator through an elevator spiral, mixing the powder with the aggregate in the aggregate elevator, and feeding the mixture into a stirring cylinder.
7. The powder feeding control method of the continuous asphalt mixing plant according to claim 6, wherein step S1 specifically comprises:
s11, determining the weight interval of the transition powder weighing according to the powder flow;
and S12, when the real-time weight of the transitional powder weighing material is lower than the weight interval, starting an arch breaking electric valve, automatically breaking an arch according to pulse time and pulse interval to supplement powder, and when the real-time weight of the transitional powder weighing material is higher than the weight interval, automatically breaking the arch and stopping.
8. The powder feeding control method of the continuous asphalt mixing plant according to claim 6, wherein step S2 specifically comprises:
s21, starting a transition scale spiral by the transition scale according to the delay time delay, and determining the preset rotating speed of the transition scale spiral according to the weight interval;
s22, when the rotating speed of the transition scale screw reaches a preset rotating speed, adjusting the rotating speed of the transition scale screw according to the real-time flow of the screw scale, and quantitatively conveying the powder in the transition scale to the screw scale.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535016.8A CN111877090A (en) | 2020-06-12 | 2020-06-12 | Powder feeding system of continuous asphalt mixture stirring equipment and control method |
| PCT/CN2021/075414 WO2021248924A1 (en) | 2020-06-12 | 2021-02-05 | Powder feeding system of continuous asphalt mixture stirring device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535016.8A CN111877090A (en) | 2020-06-12 | 2020-06-12 | Powder feeding system of continuous asphalt mixture stirring equipment and control method |
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| CN111877090A true CN111877090A (en) | 2020-11-03 |
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| CN202010535016.8A Pending CN111877090A (en) | 2020-06-12 | 2020-06-12 | Powder feeding system of continuous asphalt mixture stirring equipment and control method |
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| WO (1) | WO2021248924A1 (en) |
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| CN112407910A (en) * | 2021-01-22 | 2021-02-26 | 潍坊凯速建筑科技有限公司 | Conveying device for producing dry-mixed mortar powder |
| WO2021248924A1 (en) * | 2020-06-12 | 2021-12-16 | 福建省铁拓机械股份有限公司 | Powder feeding system of continuous asphalt mixture stirring device and control method |
| CN114428486A (en) * | 2021-12-31 | 2022-05-03 | 三一汽车制造有限公司 | Asphalt station production control method and device and asphalt station |
| CN116145500A (en) * | 2023-03-31 | 2023-05-23 | 徐州徐工养护机械有限公司 | Compensation system for rapidly balancing negative pressure |
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| CN114428486A (en) * | 2021-12-31 | 2022-05-03 | 三一汽车制造有限公司 | Asphalt station production control method and device and asphalt station |
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| WO2021248924A1 (en) | 2021-12-16 |
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