CN112030669B - Continuous asphalt mixture plant-mixing hot recycling combined equipment - Google Patents
Continuous asphalt mixture plant-mixing hot recycling combined equipment Download PDFInfo
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- CN112030669B CN112030669B CN202010926913.1A CN202010926913A CN112030669B CN 112030669 B CN112030669 B CN 112030669B CN 202010926913 A CN202010926913 A CN 202010926913A CN 112030669 B CN112030669 B CN 112030669B
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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
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
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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
- E01C19/1077—Supplying or proportioning the ingredients the liquid ingredients
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Abstract
A continuous hot plant mix regeneration combination device for asphalt mixture comprises a plurality of regeneration tanks and multi-way valves, wherein discharge ports of the regeneration tanks are respectively connected with a plurality of inlets of the multi-way valves one by one, and outlets of the multi-way valves are connected with an external regeneration stirring cylinder through a flow regulating device; the flow regulating device comprises a dosing pump, a three-way shunt regulating valve and a spray head group which are sequentially connected, a temperature regulating device, a stirrer and a dosage regulating device are arranged on the regeneration tank, the temperature regulating device is used for regulating the temperature of a regenerant in the regeneration tank, and a weighing sensor is used for measuring the weight of the regeneration tank so as to record the flow of the regenerant. According to the invention, by designing the plurality of regeneration tanks and the pneumatic three-way valve for switching, after the regenerant in one regeneration tank is used up, the regenerant in the other regeneration tank can be used for continuous production, the efficiency is high, and the problem of flow calculation blind area during feeding while metering is solved.
Description
Technical Field
The invention relates to the technical field of asphalt mixture production, in particular to continuous asphalt mixture plant-mixing heat regeneration combined equipment.
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 system of the continuous asphalt mixture plant-mixing thermal regeneration combined equipment mainly comprises an aggregate feeding system, an asphalt feeding system, a powder feeding system, a solid additive feeding system, a reclaimed material feeding system, a regenerant feeding system and the like, wherein the regenerant can reduce aged asphalt, improve the activity of the asphalt in the reclaimed material, reduce the viscosity of the asphalt in the reclaimed material, improve the penetration of the asphalt in the reclaimed material, reduce the softening point of the asphalt in the reclaimed material and increase the ductility of the asphalt in the reclaimed material, so that the adding proportion of the reclaimed material is improved, and huge environmental protection benefits and economic benefits are brought.
The traditional regenerant adopts a flowmeter as flow display, but the flowmeter has low precision, is influenced by mechanical wear, temperature, differential pressure and medium viscosity, needs to be calibrated continuously, has poor operability and cannot be used as the basis for automatically adjusting and metering.
Disclosure of Invention
The invention provides continuous hot mix plant recycling combined equipment for asphalt mixtures, which mainly aims to overcome the defects that the existing recycling agent adding method adopting a flowmeter needs to be calibrated continuously, has poor operability and cannot be used as a basis for automatically adjusting and metering.
In order to solve the technical problems, the invention adopts the following technical scheme:
a continuous hot plant-mixing regeneration combination device for asphalt mixture comprises a plurality of regeneration tanks and multi-way valves, wherein discharge ports of the regeneration tanks are respectively connected with a plurality of inlets of the multi-way valves one by one, and outlets of the multi-way valves are connected with an external regeneration stirring cylinder through a flow regulating device;
the flow regulating device comprises a constant delivery pump, a three-way shunt regulating valve and a nozzle group which are sequentially connected, wherein an inlet of the constant delivery pump is connected to an outlet of the multi-way valve, an inlet of the three-way shunt regulating valve is connected to an outlet of the constant delivery pump, a liquid spraying port of the three-way shunt regulating valve is connected to an inlet of the nozzle group, a backflow port of the three-way shunt regulating valve is connected to an inlet of the constant delivery pump, and an outlet of the nozzle group is connected to the regeneration stirring cylinder;
the regeneration tank is provided with a temperature adjusting device, a stirrer and a dosage adjusting device, and the dosage adjusting device comprises a regenerant supplement pump and a weighing sensor;
the temperature adjusting device is used for adjusting the temperature of the regenerant in the regeneration tank, the stirrer is used for stirring the regenerant in the regeneration tank, the regenerant replenishing pump is used for adding the regenerant into the regeneration tank, and the weighing sensor is used for measuring the weight of the regeneration tank and further recording the flow rate of the regenerant.
Preferably, the temperature adjusting device includes a plurality of heating groups for heating the regenerant in the regeneration tank, and a thermocouple for detecting the temperature of the regenerant in the regeneration tank.
Preferably, still be equipped with weight correcting unit on the regeneration tank, weight correcting unit is including testing the balance weight and testing the balance cylinder, it can drive to test the balance weight and locate on the regeneration tank to the pressure.
Preferably, the flow regulating device further comprises a synchronous motor, an encoder and a frequency converter, wherein the synchronous motor is used for controlling the quantitative pump to act, the encoder is used for detecting the rotating speed of the synchronous motor in real time, and the frequency converter is used for controlling the synchronous motor to drive the quantitative pump in a frequency conversion manner.
Preferably, the flow regulating device further comprises a pressure gauge, a spraying flow meter and a backflow flow meter, wherein the pressure gauge is installed between the constant delivery pump and the three-way shunt regulating valve, the spraying flow meter is installed between a liquid spraying opening of the three-way shunt regulating valve and the nozzle group, and the backflow flow meter is installed between a backflow opening of the three-way shunt regulating valve and an inlet of the constant delivery pump.
A control method of continuous asphalt mixture plant-mixing hot recycling combined equipment comprises the following steps:
1) starting equipment, and respectively adding a regenerant into a plurality of regeneration tanks until the weight is sensed by a weighing sensor arranged on the regeneration tank to reach a preset maximum value;
2) starting a temperature regulating device on the regeneration tanks to raise the temperature of the regenerant in each regeneration tank and maintain the temperature at the temperature value with the best activity of the regenerant;
3) driving the regenerant in a first regeneration tank of the plurality of regeneration tanks to flow through the multi-way valve and flow into a regeneration stirring cylinder for stirring through the control of the flow regulating device;
4) in the process of step 3, when the weight of the regenerant in the first regeneration tank is reduced to a preset minimum value, and the weight of the regenerant in a second regeneration tank of the plurality of regeneration tanks is maximized and the temperature reaches a temperature value with the best activity of the regenerant, the temperature regulating device on the first regeneration tank is closed, and the multi-way valve is switched at the same time, so that the regenerant in the second regeneration tank can flow through the multi-way valve and flow into the regeneration stirring cylinder for stirring through the control flow of the flow regulating device;
5) in step 4, after the multi-way valve is switched, controlling the dosage adjusting device and the temperature adjusting device on the first regeneration tank to be sequentially started again, so that the dosage adjusting device adds the regenerant into the first regeneration tank until the dosage adjusting device reaches a preset maximum value, and the temperature adjusting device heats the regenerant again until the temperature is a temperature value with the best activity of the regenerant, so that when the weight of the regenerant in the second regeneration tank is reduced to the minimum, the multi-way valve can be switched again to enable the regenerant in the first regeneration tank to flow to the stirring cylinder again;
6) and after the addition amount of the regenerant reaches a preset value, stopping transmitting the regenerant to the multi-way valve by each regeneration tank.
Preferably, step 1 is preceded by a verification operation: weighing the initial weight of the regeneration tank, starting a weight correction device on the regeneration tank, pressing a check balance weight in the weight correction device on the regeneration tank, and recording the current weight of the regeneration tank at the moment; and comparing the current weight of the regeneration tank with the initial weight to obtain a difference value, and if the difference value is more than an allowable error compared with the weight value of the check balance weight, correcting the weighing sensor until the difference value is within an allowable error range.
Preferably, the method for controlling the temperature of the regenerant in the regeneration tank to be raised and maintained at the temperature value with the best activity of the regenerant comprises the following steps: when the temperature of the regenerant is in a first temperature interval, starting all heating groups in the temperature adjusting device, when the temperature of the regenerant is increased to a second temperature interval, reducing the starting number of the heating groups, when the temperature of the regenerant is increased to a third temperature interval, only starting one heating group, when the temperature of the regenerant is increased to a fourth temperature interval, closing all the heating groups, and thus maintaining the temperature of the regenerant in the third temperature interval, wherein the third temperature interval is a temperature value with the best activity of the regenerant.
Preferably, the control method of the flow rate adjusting device is as follows: when the required flow of the regenerant is a first interval value, controlling the opening of a liquid spraying opening of the three-way flow dividing and adjusting valve to be 100%, simultaneously closing a return opening of the three-way flow dividing and adjusting valve, and then adjusting the rotating speed of the constant delivery pump to enable the actual flow and the theoretical flow of the regenerant to be equal or close to the same; when the required regenerant flow is a second interval value, setting the frequency of a synchronous motor for driving the constant delivery pump to be 8Hz, opening the return port of the three-way flow dividing regulating valve, and adjusting the opening degree of the liquid spraying port of the three-way flow dividing regulating valve so that the actual flow and the theoretical flow of the regenerant are equal to or close to the same; the first interval is greater than the second interval.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by designing the plurality of regeneration tanks and the pneumatic three-way valve for switching, after the regenerant in one regeneration tank is used up, the regenerant in the other regeneration tank can be used for continuous production, the efficiency is high, and the problem of flow calculation blind area during feeding while metering is solved.
2. In the control method, the regenerant passes through the regeneration tank, is given with the flow regulating device, is sprayed to the regeneration stirrer, is fully mixed with the regenerated material in the regeneration stirrer, reduces most of aged asphalt, and is fully mixed with the primary material through the primary stirrer and the secondary stirrer, so that the high-quality asphalt mixture is finally produced.
Drawings
FIG. 1 is a schematic view of the regeneration tank according to the present invention.
Fig. 2 is a schematic structural diagram of the flow regulating device of the present invention.
Fig. 3 is a schematic structural diagram of the present invention.
FIG. 4 is a basic schematic diagram of the automatic adjustment of the constant delivery pump according to the present invention.
FIG. 5 is a schematic diagram showing the relationship between the opening and the flow rate of the three-way flow-dividing regulating valve according to the present invention.
Fig. 6 is a basic principle diagram of automatic opening adjustment of the three-way flow-dividing adjusting valve in the invention.
FIG. 7 is a control diagram of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Refer to fig. 1, 2, 3, and 7. A continuous hot plant-mixing regeneration combination device for asphalt mixture comprises a plurality of regeneration tanks 1 and multi-way valves 2, wherein discharge ports 11 of the regeneration tanks 1 are respectively connected with a plurality of inlets 21 of the multi-way valves 2 one by one, and outlets 22 of the multi-way valves 2 are connected with an external regeneration stirring cylinder 4 through a flow regulating device 3; in this embodiment, the number of the regeneration tanks 1 is two, and the regeneration tanks are respectively a first regeneration tank 101 and a second regeneration tank 102, and the multi-way valve 2 is a pneumatic three-way valve;
the flow regulating device 3 comprises a fixed displacement pump 31, a three-way flow dividing regulating valve 32 and a nozzle group 33 which are connected in sequence, wherein an inlet 311 of the fixed displacement pump 31 is connected to an outlet 22 of the multi-way valve 2, an inlet 321 of the three-way flow dividing regulating valve 32 is connected to an outlet 312 of the fixed displacement pump 31, a liquid spraying port 322 of the three-way flow dividing regulating valve 32 is connected to an inlet 331 of the nozzle group 33, a return port 323 of the three-way flow dividing regulating valve 32 is connected to the inlet 311 of the fixed displacement pump 31, and an outlet 332 of the nozzle group 33 is connected to the regeneration stirring cylinder 4;
the regeneration tank 1 is provided with a temperature adjusting device 5, a stirrer 6 and a dosage adjusting device 7, wherein the dosage adjusting device 7 comprises a regenerant supplementing pump 71 and a weighing sensor 72; the stirrer 6 is designed to uniformly stir the regenerant and accelerate temperature diffusion during heating; the weighing sensor 72 can display the increase and decrease numerical value of the weight of the regenerant in the corresponding regeneration tank in real time;
the temperature adjusting device 5 is used for adjusting the temperature of the regenerant in the regeneration tank 1, the stirrer 6 is used for stirring the regenerant in the regeneration tank 1, the regenerant replenishing pump 71 is used for adding the regenerant into the regeneration tank, and the weighing sensor 72 is used for measuring the weight of the regeneration tank 1 and further recording the flow rate of the regenerant.
Conventionally, because the regenerant is in a liquid state, the activity and viscosity of the regenerant are greatly influenced by temperature, the regenerant has higher requirement on a temperature control system, and after the regenerant in a regeneration tank is used up, a newly supplemented regenerant cannot be directly put into use due to temperature. According to the invention, by designing the plurality of regeneration tanks and the pneumatic three-way valve for switching, after the regenerant in one regeneration tank is used up, the regenerant in the other regeneration tank can be used for continuous production, the efficiency is high, and the problem of flow calculation blind area during feeding while metering is solved.
Specifically, fig. 1, 2, 3, and 7 are referred to.
The temperature control device 5 includes a plurality of heating groups 51 for heating the regenerant in the regeneration tank 1, and a thermocouple 52 for detecting the temperature of the regenerant in the regeneration tank 1.
Still be equipped with weight correcting unit 8 on regeneration tank 1, weight correcting unit 8 is including examining balance weight 81 and examining balance cylinder 82, examines balance cylinder 82 and can drive and examine balance weight 81 to pressing and locate regeneration tank 1 on.
The flow regulating device 3 further comprises a synchronous motor 34, an encoder 35 and a frequency converter 36, wherein the synchronous motor 34 is used for controlling the quantitative pump 31 to act, the encoder 35 is used for detecting the rotating speed of the synchronous motor 34 in real time, and the frequency converter 36 is used for controlling the synchronous motor 34 to drive the quantitative pump 31 in a frequency conversion mode.
The flow rate adjusting device 3 further comprises a pressure gauge 37, a spraying flow meter 38 and a backflow flow meter 39, wherein the pressure gauge 37 is installed between the metering pump 31 and the three-way flow-dividing adjusting valve 32, the spraying flow meter 38 is installed between the liquid spraying port 322 of the three-way flow-dividing adjusting valve 32 and the nozzle group 33, and the backflow flow meter 39 is installed between the backflow port 323 of the three-way flow-dividing adjusting valve 32 and the inlet 311 of the metering pump 31.
The discharge gate 11 of regeneration tank 1 is connected with corrosion-resistant hose 13 through manual ball valve 12, and corrosion-resistant hose 13 reconnects the import 21 of multi-way valve 2, stops transmitting the regenerant after, closes manual ball valve 12, receives corrosion-resistant hose 13 again in the gas circuit of compressed air, sweeps the regenerant in the empty corrosion-resistant hose 13 through compressed air, prevents that the regenerant from gluing the corrosion-resistant hose.
The pressure gauge is used for pressure protection of the quantitative pump, when the pressure gauge displays that the pressure exceeds the set pressure, the synchronous motor stops working, and overpressure alarm prompt is carried out. The spraying flowmeter and the backflow flowmeter are used for monitoring the flow of the regenerant in real time, and when the synchronous motor has the same frequency and the opening of the three-way shunt regulating valve is not changed, if the flowmeter displays that the flow is changed greatly or the frequency of the synchronous motor and the opening of the three-way shunt regulating valve are changed, the flowmeter displays that the flow is changed abnormally, and whether each pipeline and the nozzle group are blocked or not and whether the constant delivery pump is damaged or not are timely detected according to the actual flow change rule. These serve to monitor the regenerant system in real time.
Refer to fig. 1, 2, 3, and 7. A control method of continuous asphalt mixture plant-mixing hot recycling combined equipment comprises the following steps:
1) starting the equipment, and respectively adding the regenerants into the regeneration tanks 1 until the weight is sensed by the weighing sensors 72 arranged on the regeneration tanks 1 to reach a preset maximum value;
2) starting a temperature regulating device 5 on the regeneration tank 2 to raise the temperature of the regenerant in each regeneration tank 1 and maintain the temperature at the temperature value with the best activity of the regenerant;
3) driving the regenerant in a first regeneration tank 101 of the plurality of regeneration tanks 1 to flow through a multi-way valve 2 and flow into a regeneration stirring cylinder 4 for stirring through the control of a flow regulating device 3;
4) in the process of step 3, when the weight of the regenerant in the first regeneration tank 101 is reduced to a preset minimum value, and the weight of the regenerant in the second regeneration tank 102 of the plurality of regeneration tanks reaches a maximum value and the temperature reaches a temperature value at which the activity of the regenerant is the best, the temperature regulating device on the first regeneration tank is closed, and the multi-way valve 2 is switched at the same time, so that the regenerant in the second regeneration tank can flow through the multi-way valve 2 and flow into the regeneration stirring cylinder 4 for stirring through the control flow of the flow regulating device 3; in this step, the purpose of closing the temperature control device of the first regeneration tank 101 while switching the multi-way valve 2 is: avoiding excessive heating of the regenerant at low levels;
5) in step 4, after the multi-way valve 2 is switched, controlling the dosage adjusting device 7 and the temperature adjusting device 5 on the first regeneration tank 101 to be sequentially started again, so that the dosage adjusting device 7 adds the regenerant into the first regeneration tank 101 to reach a preset maximum value, and the temperature adjusting device 5 heats the regenerant again to a temperature value with the best activity of the regenerant, so that when the weight of the regenerant in the second regeneration tank 102 is reduced to the minimum value, the multi-way valve 2 can be switched again to enable the regenerant in the first regeneration tank 101 to flow to the stirring cylinder 4 again;
6) and after the addition amount of the regenerant reaches a preset value, stopping transmitting the regenerant to the multi-way valve 2 by each regeneration tank 1.
In the control method, a regenerant passes through a regeneration tank 1, a flow regulating device 3 is set, and then the regenerant is sprayed to a regeneration stirrer 4, and is fully mixed with a regenerated material in the regeneration stirrer 4, so that most of aged asphalt is reduced, and is fully mixed with a primary material through a primary stirrer 41 and a secondary stirrer 42, and finally a high-quality asphalt mixture is produced. The whole control is realized by an upper computer and a PLC.
In the above-mentioned steps, the step of,
refer to fig. 1, 2, 3, and 7. The step 1 also comprises the following verification work before: weighing the initial weight of the regeneration tank 1, starting the weight correction device 8 on the regeneration tank 1, pressing the check balance weight 81 in the weight correction device 8 on the regeneration tank 1, and recording the current weight of the regeneration tank 1 at the moment; the current weight of the regeneration tank is compared with the initial weight to obtain a difference value, and if the difference value is more than an allowable error compared with the weight value of the check balance weight, the weighing sensor 72 is corrected until the difference value is within an allowable error range.
Specifically, in the present embodiment, assuming that the weight of the check-weighing weight is akg, the current weight bkg of the regeneration tank is measured by the weighing sensor before production, then the check-weighing cylinder is actuated, the check-weighing weight is placed on the regeneration tank, the weight ckg of the weighing sensor at this time is recorded, the difference between akg and c-bkg is calculated, and if the difference is close to or equal to 0, the weighing sensor of the regeneration tank is proved to be accurate.
Refer to fig. 1, 2, 3, and 7. The method for controlling the temperature of the regenerant in the regeneration tank 1 to be raised and maintained at the temperature value with the best activity of the regenerant comprises the following steps: when the temperature of the regenerant is in the first temperature interval, all the heating groups 51 in the temperature regulating device 5 are started, when the temperature of the regenerant is increased to the second temperature interval, the starting number of the heating groups 51 is reduced, when the temperature of the regenerant is increased to the third temperature interval, only one heating group is started, when the temperature of the regenerant is increased to the fourth temperature interval, all the heating groups are closed, so that the temperature of the regenerant is maintained in the third temperature interval, and the third temperature interval is the temperature value with the best activity of the regenerant.
Specifically, in the present embodiment, the temperature value with the best regenerant activity is 45 ℃, and the number of the heating groups 51 is four. When the temperature of the regenerant in the regeneration tank 1 is lower than 15 ℃, the four electric heating groups 51 are heated simultaneously, when the regenerant is heated to 15-35 ℃, the three electric heating groups 51 are heated simultaneously, when the regenerant is heated to 36-43 ℃, the two electric heating groups 51 are heated simultaneously, when the regenerant is heated to 44-45 ℃, one electric heating group 51 is heated and insulated, and when the temperature of the regenerant exceeds 45 ℃, all the heating groups 51 are closed. The method can rapidly raise the temperature of the regenerant to a specified temperature and maintain the temperature of the regenerant.
Refer to fig. 1, 2, 3, and 7. The control method of the flow adjusting device comprises the following steps: when the required flow rate of the regenerant is a first interval value, controlling the opening degree of the liquid spraying port 322 of the three-way flow-dividing regulating valve 32 to be 100%, simultaneously closing the return port 323 of the three-way flow-dividing regulating valve, and then adjusting the rotating speed of the dosing pump 31 to enable the actual flow rate and the theoretical flow rate of the regenerant to be equal/close to the same; when the required regenerant flow rate is a second interval value, setting the frequency of a synchronous motor 34 for driving the fixed displacement pump 31 to be 8Hz, opening the return port of the three-way flow dividing regulating valve, and adjusting the opening degree of a liquid spraying port 322 of the three-way flow dividing regulating valve so that the actual flow rate and the theoretical flow rate of the regenerant are equal to or close to the same value; the first interval is greater than the second interval.
The reason why the present invention adjusts the flow rate using the fixed displacement pump 31 is that: the precision of the given flow of the constant delivery pump is higher than that of a screw pump and a gear pump, the constant delivery pump cannot cause flow deviation along with the change of the pressure difference of inlet and outlet liquid, and meanwhile, the constant delivery pump can adopt a synchronous motor to carry out variable frequency control and detect the rotating speed of the motor in real time by an encoder, so that the change of the slip ratio of an asynchronous motor caused by load change is eliminated, and the accuracy and the stability of the given regenerant are ensured.
The control method of the device for regulating the flow rate is specifically,
since the frequency range of a synchronous motor is generally 5-50Hz, the lowest operating frequency is set to 8Hz in order to protect the motor and prolong the service life of the motor.
When the required flow of the additive is large (the first interval), the synchronous motor is controlled by the frequency converter to drive the fixed delivery pump to give, the frequency of the frequency converter is controlled to be 8Hz-50Hz, the regenerant passes through the fixed delivery pump and then is completely sprayed to the regeneration stirrer through the three-way shunt regulating valve, and the return port of the three-way shunt regulating valve is closed. Because the traditional flowmeter has low precision and can be influenced by mechanical abrasion, temperature, differential pressure, medium viscosity and the like, the actual flow of the regenerant is calculated by adopting the reduced weight of the weighing sensor of the regeneration tank, the frequency of the frequency converter is adjusted according to the actual flow and the theoretical flow of the regenerant, and then the rotating speed of the quantitative pump is adjusted. Because the relationship between the constant delivery pump and the rotating speed is constant, the constant delivery pump can be automatically adjusted once.
Refer to fig. 4. Therefore, during automatic production, the theoretical flow and rotating speed relationship of the fixed displacement pump can be calculated by adopting the flow parameter on the nameplate of the fixed displacement pump and the measured density of the regenerant, and then the calculation is carried out according to a given straight line of the theoretical flow and rotating speed relationship. If the total output of the equipment is 400t/h, the adding proportion of the regeneration material is 50 percent, namely 200t/h, and the adding proportion of the regeneration agent is calculated to be 0.25 percent of the regeneration material, namely 0.5 t/h. In fig. 4, the abscissa of the point a is about 45% of the rotation speed of the synchronous motor when the additive is first given, after the encoder detects that the speed is stable, the real-time flow is calculated by the weighing sensor of the regeneration tank, after the flow is displayed to be stable, the actually displayed flow is the ordinate of the point B, a straight line is made by the point B and the origin, the abscissa of the point C is the rotation speed of the regulated constant delivery pump, and the straight line is the actual flow rotation speed relationship of the constant delivery pump.
Secondly, when the required flow of the regenerant is small (the second interval), a fixed frequency shunt control method is adopted, namely, the synchronous motor fixes the 8Hz frequency (namely, 16% of rotating speed), the actual flow and the theoretical flow are converted through the weight reduced by the weighing sensor of the regeneration tank to automatically adjust the three-way shunt adjusting valve, wherein the three-way shunt adjusting valve adopts analog quantity control, the signal is 0-10V or 4-20mA, the theoretical flow is obtained by testing when the opening degree of the three-way shunt adjusting valve is 0%, 20%, 40%, 60%, 80% and 100%, and a broken line is formed, namely, as shown in fig. 5. Due to the structure of the three-way shunt regulating valve and the pressure intensity of the regenerant, the flow of the regenerant and the three-way shunt regulating valve belong to positive correlation under the condition of constant rotating speed of the synchronous motor, and the larger the opening of the three-way shunt regulating valve towards the spraying direction is, the larger the flow of the regenerant towards the spraying opening is.
Refer to fig. 6. It can be known that if the total output of the equipment is 300t/h, the addition ratio of the regeneration recycling material is 20% and 60t/h, the addition ratio of the regenerant is calculated to be 0.25% of the regeneration material, which is 0.15 t/h. According to the tested broken line, the initial opening degree of the three-way shunt regulating valve is determined, the abscissa of the point A is the opening degree of the three-way shunt regulating valve which is given for the first time, after the detection speed of the encoder is stable, the real-time flow is calculated through a weighing sensor of the regeneration tank, after the flow is displayed to be stable, the actually displayed flow is the ordinate of the point B, the point B and the original point are taken as a straight line, the abscissa of the point C is the opening degree of the three-way shunt valve after adjustment, the ordinate of the point C is very close to the ordinate of the point D at the moment, the requirement of flow error is met, and the adjustment is finished.
The adjusting method solves the problem of ultra-low frequency setting of the motor of the frequency converter, and enlarges the proportion range of adding the reclaimed materials.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The utility model provides a hot regeneration combination equipment of continuous type bituminous mixture plantmix which characterized in that: the device comprises a plurality of regeneration tanks and multi-way valves, wherein discharge ports of the regeneration tanks are respectively connected with a plurality of inlets of the multi-way valves one by one, and outlets of the multi-way valves are connected with an external regeneration stirring cylinder through a flow regulating device;
the flow regulating device comprises a constant delivery pump, a three-way shunt regulating valve and a nozzle group which are sequentially connected, wherein an inlet of the constant delivery pump is connected to an outlet of the multi-way valve, an inlet of the three-way shunt regulating valve is connected to an outlet of the constant delivery pump, a liquid spraying port of the three-way shunt regulating valve is connected to an inlet of the nozzle group, a backflow port of the three-way shunt regulating valve is connected to an inlet of the constant delivery pump, and an outlet of the nozzle group is connected to the regeneration stirring cylinder;
the regeneration tank is provided with a temperature adjusting device, a stirrer and a dosage adjusting device, and the dosage adjusting device comprises a regenerant supplement pump and a weighing sensor;
the temperature adjusting device is used for adjusting the temperature of the regenerant in the regeneration tank, the stirrer is used for stirring the regenerant in the regeneration tank, the regenerant replenishing pump is used for adding the regenerant into the regeneration tank, and the weighing sensor is used for measuring the weight of the regeneration tank and further recording the flow rate of the regenerant;
the control method of the regeneration combination equipment comprises the following steps:
1) starting equipment, and respectively adding a regenerant into a plurality of regeneration tanks until the weight is sensed by a weighing sensor arranged on the regeneration tank to reach a preset maximum value;
2) starting a temperature regulating device on the regeneration tanks to raise the temperature of the regenerant in each regeneration tank and maintain the temperature at the temperature value with the best activity of the regenerant;
3) driving the regenerant in a first regeneration tank of the plurality of regeneration tanks to flow through the multi-way valve and flow into a regeneration stirring cylinder for stirring through the control of the flow regulating device;
4) in the process of step 3, when the weight of the regenerant in the first regeneration tank is reduced to a preset minimum value, and the weight of the regenerant in a second regeneration tank of the plurality of regeneration tanks is maximized and the temperature reaches a temperature value with the best activity of the regenerant, the temperature regulating device on the first regeneration tank is closed, and the multi-way valve is switched at the same time, so that the regenerant in the second regeneration tank can flow through the multi-way valve and flow into the regeneration stirring cylinder for stirring through the control flow of the flow regulating device;
5) in step 4, after the multi-way valve is switched, controlling the dosage adjusting device and the temperature adjusting device on the first regeneration tank to be sequentially started again, so that the dosage adjusting device adds the regenerant into the first regeneration tank until the dosage adjusting device reaches a preset maximum value, and the temperature adjusting device heats the regenerant again until the temperature is a temperature value with the best activity of the regenerant, so that when the weight of the regenerant in the second regeneration tank is reduced to the minimum, the multi-way valve can be switched again to enable the regenerant in the first regeneration tank to flow to the stirring cylinder again;
6) after the addition amount of the regenerant reaches a preset value, stopping transmitting the regenerant to the multi-way valve by each regeneration tank;
the control method of the flow regulating device comprises the following steps: when the required flow of the regenerant is a first interval value, controlling the opening of a liquid spraying opening of the three-way flow dividing and adjusting valve to be 100%, simultaneously closing a return opening of the three-way flow dividing and adjusting valve, and then adjusting the rotating speed of the constant delivery pump to enable the actual flow and the theoretical flow of the regenerant to be equal or close to the same; when the required regenerant flow is a second interval value, setting the frequency of a synchronous motor for driving the constant delivery pump to be 8Hz, opening the return port of the three-way flow dividing regulating valve, and adjusting the opening degree of the liquid spraying port of the three-way flow dividing regulating valve so that the actual flow and the theoretical flow of the regenerant are equal to or close to the same; the first interval is greater than the second interval.
2. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: the temperature adjusting device comprises a plurality of heating groups for heating the regenerant in the regeneration tank and thermocouples for detecting the temperature of the regenerant in the regeneration tank.
3. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: still be equipped with weight correcting unit on the regeneration jar, weight correcting unit is including testing the balance weight and testing the balance cylinder, it can drive to test the balance cylinder test the balance weight and locate on the regeneration jar to the pressure.
4. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: the flow regulating device further comprises a synchronous motor, an encoder and a frequency converter, wherein the synchronous motor is used for controlling the quantitative pump to act, the encoder is used for detecting the rotating speed of the synchronous motor in real time, and the frequency converter is used for controlling the synchronous motor to drive the quantitative pump in a frequency conversion mode.
5. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: the flow regulating device further comprises a pressure gauge, a spraying flow meter and a backflow flow meter, wherein the pressure gauge is arranged between the constant delivery pump and the three-way flow distribution regulating valve, the spraying flow meter is arranged between a liquid spraying opening of the three-way flow distribution regulating valve and the spray head group, and the backflow flow meter is arranged between a backflow opening of the three-way flow distribution regulating valve and an inlet of the constant delivery pump.
6. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: the step 1 also comprises the following verification work before: weighing the initial weight of the regeneration tank, starting a weight correction device on the regeneration tank, pressing a check balance weight in the weight correction device on the regeneration tank, and recording the current weight of the regeneration tank at the moment; and comparing the current weight of the regeneration tank with the initial weight to obtain a difference value, and if the difference value is more than an allowable error compared with the weight value of the check balance weight, correcting the weighing sensor until the difference value is within an allowable error range.
7. The continuous hot mix plant mix recycling combined equipment for asphalt mixtures according to claim 1, characterized in that: the method for controlling the temperature of the regenerant in the regeneration tank to be raised and maintained at the temperature value with the best activity of the regenerant comprises the following steps: when the temperature of the regenerant is in a first temperature interval, starting all heating groups in the temperature adjusting device, when the temperature of the regenerant is increased to a second temperature interval, reducing the starting number of the heating groups, when the temperature of the regenerant is increased to a third temperature interval, only starting one heating group, when the temperature of the regenerant is increased to a fourth temperature interval, closing all the heating groups, and thus maintaining the temperature of the regenerant in the third temperature interval, wherein the third temperature interval is a temperature value with the best activity of the regenerant.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020165037A1 (en) * | 2019-02-15 | 2020-08-20 | KSB SE & Co. KGaA | Method for controlling a circulation pump |
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| ES1061700Y (en) * | 2005-11-29 | 2006-07-01 | Valver Air Speed S L | DOSING MACHINE AND MIXER OF LIQUID PRODUCTS IN GENERAL |
| CN204551196U (en) * | 2015-03-26 | 2015-08-12 | 福建铁拓机械有限公司 | A kind of automation bitumen regenerant add-on system |
| CN204570595U (en) * | 2015-04-22 | 2015-08-19 | 长安大学 | A kind of emulsion-type Snow Agent distribution vehicle based on AC variable-frequency speed regulation system |
| CN205152751U (en) * | 2015-08-19 | 2016-04-13 | 福建南方路面机械有限公司 | A continuous type regenerant addition system for regenerating pitch regeneration agitated vessel |
| CN206344026U (en) * | 2017-01-06 | 2017-07-21 | 东莞市玮明实业有限公司 | A kind of vacuum tank automatic draining device of many module switchings |
| CN208830098U (en) * | 2018-09-18 | 2019-05-07 | 广东华路交通科技有限公司 | One kind being used for hot in-plant reclaimed asphalt mixture spraying device for regeneration agent |
| CN111041942A (en) * | 2019-12-12 | 2020-04-21 | 三一汽车制造有限公司 | Additive delivery system, asphalt mixing plant and control method |
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