CN110306406B - Device and method for controlling transverse uniformity of liquid - Google Patents

Device and method for controlling transverse uniformity of liquid Download PDF

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Publication number
CN110306406B
CN110306406B CN201910509733.0A CN201910509733A CN110306406B CN 110306406 B CN110306406 B CN 110306406B CN 201910509733 A CN201910509733 A CN 201910509733A CN 110306406 B CN110306406 B CN 110306406B
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liquid
flow
nozzle
spray
spraying
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CN110306406A (en
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赵斌
刘浩
黄建华
沙洪伟
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Jiangsu XCMG Construction Machinery Institute Co Ltd
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Jiangsu XCMG Construction Machinery Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0423—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material for supplying liquid or other fluent material to several spraying apparatus
    • 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
    • E01C19/12—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 distributing granular or liquid materials
    • E01C19/16—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 distributing granular or liquid materials for applying or spreading liquid materials, e.g. bitumen slurries
    • E01C19/17—Application by spraying or throwing
    • E01C19/176—Spraying or throwing elements, e.g. nozzles; Arrangement thereof or supporting structures therefor, e.g. spray-bars
    • 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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Nozzles (AREA)
  • Special Spraying Apparatus (AREA)

Abstract

The invention discloses a device and a method for controlling the transverse uniformity of liquid, wherein the device comprises a spray rod, at least two spray assemblies and a controller, wherein the spray rod is of a hollow structure and is used for receiving the liquid; each spray assembly comprises a nozzle, a spray valve and a pressure sensor, wherein the inlet of the nozzle is positioned in the spray rod; the spray valve is connected with the inlet of the nozzle and used for controlling the communication state between the inlet of the nozzle and the interior of the spray rod; the pressure sensor is arranged at the inlet of the nozzle and used for detecting the pressure value at the inlet of the nozzle; the controller is respectively connected with the spray valves and the pressure sensors in the spray assemblies, controls the duty ratios of the spray valves corresponding to the nozzles according to the received pressure signal values sent by the pressure sensors and the built-in total liquid flow values, and controls the spray valves to be closed and opened based on the duty ratios. The invention can realize the automatic regulation and control of the spraying flow of each spraying assembly and realize the control of the transverse uniformity of the liquid.

Description

Device and method for controlling transverse uniformity of liquid
Technical Field
The invention belongs to the technical field of foamed asphalt cold in-place recycling construction machinery, particularly relates to a device and a method for controlling the transverse uniformity of liquid, and particularly relates to a device, a system and a method for controlling the transverse uniformity of foamed asphalt.
Background
With the development of economy, a large number of asphalt roads need to be rebuilt or expanded every year, and the large amount of waste asphalt generated by the construction causes serious influence on the environment; with the continuous improvement of the awareness of people on road environmental protection, the cold regeneration technology of the foamed asphalt is developed. The cold regeneration technology of foamed asphalt is used as an environment-friendly construction scheme, and is characterized in that asphalt waste is milled on site, then foamed asphalt with a certain proportion is sprayed, stirred and paved on site for forming. The horizontal homogeneity of spraying of foam pitch has directly decided bituminous paving's the effect of paving, the sprinkler of foam pitch is single-ended formula foaming roof beam usually at present, the pitch gets into from foaming roof beam one end promptly, spray the pitch to the construction operation face through a plurality of nozzle, because pitch is high viscose state, the resistance is great, pitch can produce certain loss of pressure along the pipeline, pitch is every to flow through a nozzle, the flow just will redistribute once again, the pressure of pitch, speed, the quality all sends the change, the flow distribution who leads to each nozzle is uneven, pitch flow reduces along foaming roof beam pitch flow direction gradually, cause great horizontal homogeneity, finally lead to the inhomogeneous distribution of road surface pitch, influence the horizontal homogeneity of road surface atress, greatly reduced road surface's life. At present, different nozzle sizes are designed mainly by selecting proper asphalt nozzles according to pressure distribution characteristics so as to change the resistance state of each nozzle, and further improve the flow consistency of asphalt spraying. Because the pressure characteristic of the asphalt is related to factors such as asphalt temperature and viscosity, the accurate redistribution and control of the asphalt quantity are difficult to realize by singly changing the asphalt nozzle, and when processing errors exist in nozzle processing, the effect of improving the transverse uniformity of spraying is poor.
US patent publication No. US6565281B2 discloses a device for paving a road and a device for producing foamed asphalt, in which asphalt enters from one end of a foaming beam, a plurality of asphalt spray nozzles are distributed on the foaming beam, and water spray nozzles and compressed air nozzles are matched to realize synchronous spraying of asphalt, water and air, so that the spraying effect at one nozzle can be ensured, and the flow rate of each asphalt spray nozzle is inconsistent due to pressure loss of asphalt along the foaming beam, as shown in fig. 1.
Chinese patent application No. CN201810067137.7 discloses a structure for changing the aperture of a spray nozzle, and a suitable nozzle size is selected at a suitable position according to the pressure of asphalt. The mode can improve the transverse spraying uniformity of the asphalt to a certain extent, but the influence factors of the asphalt pressure distribution are more, the nozzle size is influenced by the asphalt type, the temperature, the asphalt viscosity and the nozzle processing precision, the method is difficult to adapt to complicated and changeable construction sites, and the transverse spraying uniformity is difficult to ensure, which is shown in fig. 2 specifically.
Disclosure of Invention
In view of the above problems, the present invention provides an apparatus, system and method for controlling the lateral uniformity of foamed asphalt.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides an apparatus for controlling lateral uniformity of a liquid, comprising:
the spraying rod is of a hollow structure and is used for receiving liquid;
at least two spray assemblies, each spray assembly comprising a nozzle, a spray valve, and a pressure sensor, an inlet of the nozzle being located within the spray wand; the spray valve is connected with the inlet of the nozzle and used for controlling the communication state between the inlet of the nozzle and the interior of the spray rod; the pressure sensor is arranged at the inlet of the nozzle and used for detecting the pressure value at the inlet of the nozzle;
and the controller is respectively connected with the spraying valves and the pressure sensors in the spraying assemblies, calculates the duty ratios of the spraying valves corresponding to the nozzles according to the received pressure signal values sent by the pressure sensors and the built-in total liquid flow values, and controls the spraying valves to be closed and opened based on the duty ratios.
As a further improvement of the present invention, the apparatus further comprises a pump unit including a metering pump, a drive motor, and a motor rotational speed sensor;
the metering pump is connected with the driving motor and driven by the driving motor to rotate, and the output end of the metering pump is connected with the input end of the spraying rod;
the motor rotating speed sensor is respectively connected with the metering pump and the controller, acquires the rotating speed of the metering pump, converts the rotating speed into the actual total flow of the liquid and then sends the actual total flow of the liquid to the controller; the controller controls the rotational speed of the drive motor in accordance with the received actual total flow rate data of the liquid.
As a further improvement of the present invention, the apparatus further comprises a flow sensor, the flow sensor is disposed at the output port of the pump unit, the output end of the flow sensor is connected to the controller, and the actual total flow of the liquid is output to the controller; the controller calculates the duty ratio of each spraying valve according to the actual total flow of the received liquid and the pressure signal value sent by each pressure sensor, controls the closing and opening of the spraying valves based on the duty ratio, and/or compares the actual total flow of the received liquid with a set flow value, and controls the rotating speed of the driving motor according to the comparison result.
As a further improvement of the present invention, the calculation formula of the duty ratio of each spraying valve controlled by the controller is as follows:
γn＝(Q/n)/qi*100％
wherein Q is the actual total flow of the liquid or the built-in total flow value of the liquid; n is the number of nozzles; q. q.siAnd obtaining the actual flow of each nozzle according to a pressure-flow relation table.
As a further improvement of the present invention, the flow sensor is a self-heating flow sensor; or a heating plate is arranged outside the flow sensor.
As a further improvement of the invention, the device also comprises a temperature sensor, wherein the temperature sensor is arranged in the spray rod, and the output end of the temperature sensor is connected with the controller and is used for acquiring the real-time temperature of the liquid.
As a further improvement of the present invention, the apparatus further comprises an input unit and a display unit;
the output end of the input unit is connected with the input end of the controller and used for setting parameters;
the input end of the display unit is connected with the output end of the controller and used for displaying the data detected in the device.
In a second aspect, the present invention also provides a method for controlling the lateral uniformity of a liquid, comprising the steps of:
collecting output pressure signal values of pressure sensors positioned at inlets of the nozzles;
and calculating the duty ratio of the spraying valve corresponding to each nozzle according to the received pressure signal value sent by each pressure sensor and the built-in total liquid flow value, and controlling the spraying valve to be closed and opened based on the duty ratio so that the liquid output by the pump unit in the spraying rod uniformly flows out from each nozzle.
As a further improvement of the present invention, the method further comprises: the method comprises the steps of collecting the actual total flow of liquid output by a flow sensor arranged at an output port of a pump unit, calculating the duty ratio of each spraying valve according to the received actual total flow of the liquid and the pressure signal value sent by each pressure sensor, controlling the spraying valves to be closed and opened based on the duty ratio, and/or comparing the actual total flow of the received liquid with a set flow value, and controlling the rotating speed of a driving motor in the pump unit according to the comparison result.
As a further improvement of the present invention, the calculation formula for controlling the duty ratio of each spray valve is as follows:
γn＝(Q/n)/qi*100％
in the formula, Q is the actual total flow of the liquid or the total flow value of the liquid output by the built-in pump unit; n is the number of nozzles; q. q.siAnd obtaining the actual flow of each nozzle according to a pressure-flow relation table.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a device and a method for controlling the transverse uniformity of liquid, which are based on pressure monitoring at each nozzle on a spray rod and by referring to a pressure-flow relation table, provide a method for realizing the accurate control of the spray flow of a single nozzle by adjusting the duty ratio of a spray valve, and finish the automatic adjustment and control of the spray flow by timely adjusting the duty ratio of each spray valve, thereby realizing the control of the transverse uniformity of the liquid.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a foamed asphalt integrated foaming system in the prior art;
FIG. 2 is a schematic structural diagram of an asphalt foaming and spraying device and an asphalt cold recycling device in the prior art;
FIG. 3 is a schematic diagram of an electrical control principle of a lateral uniformity control system for liquid according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the overall structure of a lateral uniformity control system for liquid according to an embodiment of the present invention;
FIG. 5 is a schematic view of a liquid flow control system according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for controlling lateral uniformity of a liquid according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Because the integrated foaming system of foam pitch among the prior art adopts single-ended formula foaming beam structure, this structure can realize the pitch foaming, but has pitch pressure loss, the inhomogeneous problem of flow. In addition, the existing patent improves the horizontal uniformity of spraying by changing the size of the spraying nozzle on each foaming beam, and has a certain compensation effect, however, due to the variability of construction environment, the method is difficult to be applied to the current situation that the types of asphalt are various and the characteristics of asphalt are complex. Therefore, the invention provides a device and a method for controlling the transverse uniformity of liquid aiming at the transverse uniformity problem of a foamed asphalt integrated foaming system, so as to realize the automatic regulation and control of the spraying flow and finally realize the transverse uniformity control of the liquid.
Example 1
3-4 an embodiment of the present invention provides an apparatus for controlling lateral uniformity of a liquid, comprising: a spray bar 1, at least two spray assemblies and a controller 5;
the spray bar 1 is a hollow structure and is used for receiving liquid, such as foamed asphalt; the spray bar 1 can adopt the spray bar 1 in the prior art, so the structure of the spray bar 1 is not particularly limited in the invention; preferably, an input port is arranged at one end of the spray rod 1, and as the spray rod 1 is of a single-end inlet type, pressure loss exists in the liquid along the flowing direction in the spray rod 1;
each spraying assembly comprises a nozzle 2, a spraying valve 3 and a pressure sensor 4; the inlet of the nozzle 2 is located in the spray bar 1; the spray valve 3 is connected with the inlet of the nozzle 2 and is used for controlling the communication state between the inlet of the nozzle 2 and the interior of the spray rod 1, in the specific implementation process of the spray valve, the spray valve 3 is an electric control valve and can be realized by selecting a driving cylinder, and the communication state between the inlet of the nozzle 2 and the interior of the spray rod 1 is controlled by controlling the position relation between a piston rod of the driving cylinder and the inlet of the nozzle 2; the pressure sensor 4 is arranged at the inlet of the nozzle 2 and used for detecting and acquiring the pressure value at the inlet of the nozzle 2 in real time, and the pressure sensor 4 can be in an output form such as a current type, a voltage type and a resistance type; preferably, the spray assemblies are arranged on the spray bar 1 at equal intervals;
the controller 5 is respectively connected with the spray valves 3 and the pressure sensors 4 in each spray assembly, calculates the duty ratio of the spray valve 3 corresponding to each nozzle 2 according to the received pressure signal value sent by each pressure sensor 4 and the built-in total liquid flow value, and controls the spray valves 3 to be closed and opened based on the duty ratio, specifically referring to fig. 6; preferably, the calculation formula for controlling the duty ratio of each spray valve 3 is as follows:
γn＝(Q/n)/qi*100％
in the formula, Q is the total liquid flow value output by the built-in pump unit; n is the number of the nozzles 2; q. q.siFor the actual flow rate of each nozzle 2, the actual flow rate of each nozzle 2 is obtained according to a pressure-flow rate relation table.
In a specific implementation manner of the embodiment of the present invention, the apparatus further includes an input unit 12, a display unit 13, and a storage unit 14; the output of the input unit 12 is connected to the input of the controller 5 for setting parameters, such as: inputting construction parameters such as an asphalt flow set value, an asphalt temperature set value, an asphalt type, a foaming water amount set value, a spraying mode, a running speed set value, a spraying width set value and the like, wherein the input module is connected with the controller 5 through a communication cable and is used for providing construction data of a user for the controller 5; the input of the display unit 13 is connected to the output of the controller 5 for displaying data detected in the device, such as: actual asphalt flow, actual asphalt pump speed, actual asphalt temperature, asphalt pressure, and the like; the display unit 13 can be a display, and the display is connected with the controller 5 through a communication cable and is used for presenting important parameters in construction to an operator in a graphical and graphical mode; the storage unit 14 is responsible for storing the logical relationship between the flow rate and the liquid pressure of different types of liquids (asphalt) at different temperatures and viscosities in a storage area of the controller 5, and is connected with the controller 5 through a communication cable or a communication protocol.
Example 2
This example differs from example 1 in that: the device further comprises a container 6 and a pump unit; the container 6 is filled with a liquid, such as foamed bitumen; the pump unit comprises a metering pump 7, a driving motor 9 and a motor rotating speed sensor 8;
the metering pump 7 is connected with the driving motor 9 and driven by the driving motor 9 to rotate, the input end of the metering pump is connected with the container 6, and the output end of the metering pump is connected with the spraying rod 1; preferably, the metering pump 7 is a quantitative pump, and the liquid in the container 6 is pumped into the spraying rod 1 by the driving of the driving motor 9;
the motor rotating speed sensor 8 is respectively connected with the metering pump 7 and the controller 5, obtains the rotating speed of the metering pump 7, converts the rotating speed into the actual total flow of the liquid and then sends the actual total flow of the liquid to the controller 5;
the controller 5 controls the rotation speed of the driving motor 9 according to the received actual total flow data of the liquid, so as to ensure the stability of the liquid flow, and specifically, referring to fig. 5 and 6, firstly, the liquid flow is set, the rotation speed of the driving motor 9 is controlled, the liquid flow is ensured to reach a set value, and then the liquid circulation mode is entered; the liquid flow can also be calculated by the rotation speed detected by the motor rotation speed sensor 8 and the displacement of the metering pump 7.
Example 3
This example differs from example 1 in that: the device further comprises a flow sensor 10, wherein the flow sensor 10 is arranged at an output port of the pump unit, an output end of the flow sensor 10 is connected with the controller 5, and the actual total flow of the liquid is output to the controller 5; in the practical application process, the flow sensor 10 may be in the output form of current type, voltage type, resistance type, etc.;
the controller 5 calculates the duty ratio of each spray valve 3 according to the actual total flow of the received liquid and the pressure signal value sent by each pressure sensor 4, controls the closing and opening of the spray valves 3 based on the duty ratio, and/or compares the actual total flow of the received liquid with a set flow value, and controls the rotating speed of the driving motor 9 according to the comparison result.
The calculation formula of the duty ratio of each spray valve 3 controlled by the controller 5 is as follows:
γn＝(Q/n)/qi*100％
wherein Q is the actual total flow rate of the liquid; n is the number of the nozzles 2; q. q.siFor the actual flow rate of each nozzle 2, the actual flow rate of each nozzle 2 is obtained according to a pressure-flow rate relation table.
Example 4
This example differs from example 1 in that: the flow sensor 10 is a self-heating flow sensor 10; or a heating sheet is arranged outside the flow sensor 10, so that the blocking phenomenon of the flow sensor 10 can be avoided.
Example 5
The device also comprises a temperature sensor 11, wherein the temperature sensor 11 is arranged in the spray rod 1, and the output end of the temperature sensor 11 is connected with the controller 5 and is used for acquiring the real-time temperature of the liquid; preferably, the temperature sensor 11 is provided at the inlet, middle, rear end, etc. of the spray bar 1, not limited to the position shown in fig. 4, for acquiring the real-time temperature of the liquid. The viscosity of the liquid (asphalt) is related to the temperature, the viscosity influences the relation between the flow and the pressure of the liquid, and the corresponding pressure and flow values can be more accurately obtained from the flow-pressure curve by detecting the temperature.
Example 6
The invention also provides a method for controlling the lateral uniformity of a liquid, comprising the steps of:
collecting output pressure signal values of pressure sensors 4 positioned at inlets of the nozzles 2;
calculating the duty ratio of the spray valve 3 corresponding to each nozzle 2 according to the received pressure signal value sent by each pressure sensor 4 and the built-in total liquid flow value, and controlling the spray valve 3 to be closed and opened based on the duty ratio so that the liquid output by the pump unit in the spray rod 1 uniformly flows out from each nozzle 2; preferably, the calculation formula for controlling the duty ratio of each spray valve 3 is as follows:
γn＝(Q/n)/q*100％
in the formula, Q is the total liquid flow value output by the built-in pump unit; n is the number of the nozzles 2; q is the actual flow rate of each nozzle 2, and the actual flow rate of each nozzle 2 is obtained according to a pressure-flow relation table.
As a further improvement of the present invention, the method further comprises: collecting the actual total flow of the liquid output by a flow sensor 10 arranged at the output port of the pump unit, calculating the duty ratio of each spray valve 3 according to the received actual total flow of the liquid and the pressure signal value sent by each pressure sensor 4, controlling the spray valves 3 to be closed and opened based on the duty ratio, and/or comparing the actual total flow of the received liquid with a set flow value, and controlling the rotating speed of a driving motor 9 in the pump unit according to the comparison result; preferably, the calculation formula for controlling the duty ratio of each spray valve 3 is as follows:
γn＝(Q/n)/qi*100％
wherein Q is the actual total flow rate of the liquid; n is the number of the nozzles 2; q. q.siFor the actual flow rate of each nozzle 2, the actual flow rate of each nozzle 2 is obtained according to a pressure-flow rate relation table.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. An apparatus for controlling lateral uniformity of a liquid, comprising:
the spraying rod is of a hollow structure and is used for receiving liquid;
at least two spray assemblies, each spray assembly comprising a nozzle, a spray valve, and a pressure sensor, an inlet of the nozzle being located within the spray wand; the spray valve is connected with the inlet of the nozzle and used for controlling the communication state between the inlet of the nozzle and the interior of the spray rod; the pressure sensor is arranged at the inlet of the nozzle and used for detecting the pressure value at the inlet of the nozzle;
the controller is respectively connected with the spraying valves and the pressure sensors in the spraying assemblies, calculates the duty ratios of the spraying valves corresponding to the nozzles according to the received pressure signal values sent by the pressure sensors and the built-in total liquid flow rate values, and controls the spraying valves to be closed and opened based on the duty ratios;
the duty ratio of each spraying valve is calculated by the formula:
γn＝(Q/n)/qi*100％
wherein Q is the actual total flow of the liquid or the built-in total flow value of the liquid; n is the number of nozzles; q. q.siObtaining the actual flow of each nozzle according to a pressure-flow relation table for the actual flow of each nozzle;
the device also comprises a pump unit, wherein the pump unit comprises a metering pump, a driving motor and a motor rotating speed sensor;
the metering pump is connected with the driving motor and driven by the driving motor to rotate, and the output end of the metering pump is connected with the input end of the spraying rod;
the motor rotating speed sensor is respectively connected with the metering pump and the controller, acquires the rotating speed of the metering pump, converts the rotating speed into the actual total flow of the liquid and then sends the actual total flow of the liquid to the controller; the controller controls the rotating speed of the driving motor according to the received actual total flow data of the liquid;
the device also comprises a flow sensor, wherein the flow sensor is arranged at the output port of the pump unit, the output end of the flow sensor is connected with the controller, and the actual total flow of the liquid is output to the controller; the controller calculates the duty ratio of each spraying valve according to the actual total flow of the received liquid and the pressure signal value sent by each pressure sensor, controls the closing and opening of the spraying valves based on the duty ratio, and/or compares the actual total flow of the received liquid with a set flow value, and controls the rotating speed of the driving motor according to the comparison result.
2. A device for controlling the lateral uniformity of a liquid according to claim 1, wherein: the flow sensor is a self-heating flow sensor; or a heating plate is arranged outside the flow sensor.
3. A device for controlling the lateral uniformity of a liquid according to claim 1, wherein: the device also comprises a temperature sensor, wherein the temperature sensor is arranged in the spray rod, and the output end of the temperature sensor is connected with the controller and used for acquiring the real-time temperature of the liquid.
4. A device for controlling the lateral uniformity of a liquid according to claim 1, wherein: the device further comprises an input unit and a display unit;
the output end of the input unit is connected with the input end of the controller and used for setting parameters;
the input end of the display unit is connected with the output end of the controller and used for displaying the data detected in the device.
5. A method for controlling the lateral uniformity of a liquid, comprising the steps of:
collecting output pressure signal values of pressure sensors positioned at inlets of the nozzles;
calculating the duty ratio of the spraying valve corresponding to each nozzle according to the received pressure signal value sent by each pressure sensor and the built-in total liquid flow value, and controlling the spraying valve to be closed and opened based on the duty ratio so that the liquid output by the pump unit in the spraying rod uniformly flows out from each nozzle;
the duty ratio of each spraying valve is calculated by the formula:
γn＝(Q/n)/qi*100％
wherein Q is the actual total flow of the liquid or the built-in total flow value of the liquid; n is the number of nozzles; q. q.siObtaining the actual flow of each nozzle according to a pressure-flow relation table for the actual flow of each nozzle;
the method further comprises the following steps: the method comprises the steps of collecting the actual total flow of liquid output by a flow sensor arranged at an output port of a pump unit, calculating the duty ratio of each spraying valve according to the received actual total flow of the liquid and the pressure signal value sent by each pressure sensor, controlling the spraying valves to be closed and opened based on the duty ratio, and/or comparing the actual total flow of the received liquid with a set flow value, and controlling the rotating speed of a driving motor in the pump unit according to the comparison result.
CN201910509733.0A 2019-06-13 2019-06-13 Device and method for controlling transverse uniformity of liquid Active CN110306406B (en)

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