CN119832701B - Road surface cold recycling machine spraying device blockage alarm method and system - Google Patents
Road surface cold recycling machine spraying device blockage alarm method and system Download PDFInfo
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Abstract
本发明公开了一种路面冷再生机喷洒装置堵塞报警方法及系统，方法包括安装设备、获取初始压力值、计算的初始压力差值、采集作业过程中实时压力值、计算作业过程中的压力差值、判定各分支管路的堵塞状态、判定整机能否继续作业。系统包括喷洒泵、分流阀块和电控喷头，连接喷洒泵与分流阀块的总喷洒管路，连接分流阀块与各个电控喷头的分支管路，总喷洒管路和分支管路中分别设有与控制器信号连接的第一、二级压力传感器。有益效果：本发明在同一施工条件和工况的前提下，对比初始状态和实时状态的压力差值更加准确的判定各分支管路的堵塞情况；采用体积小成本低的压力传感器实现对各分支管路堵塞情况的实时监控，提高了整机产品性能并且降低了成本。
The present invention discloses a method and system for alarming the blockage of a spray device of a road surface cold regeneration machine. The method includes installing equipment, obtaining an initial pressure value, calculating an initial pressure difference, collecting real-time pressure values during operation, calculating a pressure difference during operation, determining the blockage state of each branch pipeline, and determining whether the whole machine can continue to operate. The system includes a spray pump, a diverter valve block, and an electric-controlled nozzle, a total spray pipeline connecting the spray pump and the diverter valve block, and branch pipelines connecting the diverter valve block and each electric-controlled nozzle. The total spray pipeline and the branch pipeline are respectively provided with a first and a second level pressure sensor connected to the controller signal. Beneficial effects: Under the premise of the same construction conditions and working conditions, the present invention compares the pressure difference between the initial state and the real-time state to more accurately determine the blockage of each branch pipeline; a small-sized and low-cost pressure sensor is used to realize real-time monitoring of the blockage of each branch pipeline, thereby improving the performance of the whole machine product and reducing the cost.
Description
Technical Field
The invention relates to a monitoring and alarming method and system for important parts of engineering machinery equipment, in particular to a blocking and alarming method and system for a spraying device of a road surface cold recycling machine, and belongs to the technical field of engineering machinery.
Background
The road surface cold recycling machine is an important construction device for carrying out on-site cold recycling on damaged asphalt road surfaces, when the asphalt road surfaces and a base layer are mixed by utilizing a mixing rotor, spraying agents such as water, emulsified asphalt, foaming asphalt and the like are required to be sprayed into a mixing housing by a spraying device during mixing, the adding amount of the spraying agents has dosage requirements, and the uniformity and the dosage of the spraying agents have great influence on the road surface quality after the cold recycling of the constructed road surfaces.
Chinese patent CN114779840A discloses an automatic electric control method and system for spraying emulsified asphalt of regeneration machinery, which adopts the technical scheme that firstly, preset parameters such as total working width, material density, emulsified asphalt content, total working width and the like are input into a controller, secondly, the controller calculates asphalt spraying amount according to the preset parameters, actual measured vehicle speed and milling depth, compares the asphalt spraying amount with actual measured asphalt flow, adjusts PWM current output according to a comparison result and a control rule, thereby controlling the rotating speed of an asphalt pump to carry out flow control, and real-time tests the asphalt spraying amount by a sensor and feeds back the asphalt spraying amount to the controller to carry out PID closed-loop adjustment so as to ensure the emulsified asphalt content required by cold regeneration of a pavement.
The utility model provides a flow meter sensor is provided with on the pitch pump, the pitch pump is connected and is sprayed the pipeline, it has a plurality of to spray the mouth to open on the pipeline, it all is equipped with and sprays the solenoid valve to spray the mouth department, set up pressure sensor on the pipeline, the cooperation controller provides overvoltage protection to whole system, be provided with on the control box and spray the pilot lamp, show the operating condition who sprays the solenoid valve, but if some spray mouthful sprays unsmoothly or blocks up, all hardly receive the influence to the flow meter sensor of pitch pump, pressure sensor on the pipeline and spray the pilot lamp, can't accurately judge the operating condition of every shower nozzle.
In addition, chinese patent CN202533764U discloses a state monitoring system for a spraying device of a road surface cold regenerator, and the patent branch adopts a flow sensor, but because of the large volume and high cost of the flow sensor, a flowmeter cannot be installed in each branch pipeline to monitor the flow of the pipeline.
Disclosure of Invention
The invention aims to provide a blockage alarm method and a blockage alarm system for a spraying device of a road surface cold recycling machine, aiming at the problem that the real-time unblocked condition of each branch pipeline spray head cannot be monitored in the prior art; the invention can realize the monitoring of the pressure value between the total spraying pipeline and each branch pipeline by adopting the pressure sensor with small volume and low cost, judges the blocking condition of each branch pipeline by the measured pressure difference value between the total pipeline and each branch pipeline, can avoid measuring the flow by adopting the flowmeter with larger volume and higher cost, enables the real-time unblocked condition monitoring of each branch pipeline to be a feasible scheme, can further judge whether shutdown maintenance is needed, and improves the operation efficiency on the premise of ensuring the operation quality.
The technical scheme is that the blockage alarm method for the spraying device of the road surface cold recycling machine comprises the following steps:
The method comprises the steps that firstly, a first-stage pressure sensor is arranged in a main spraying pipeline, sequencing and numbering are carried out on each branch pipeline, a second-stage pressure sensor is respectively arranged in each branch pipeline, and the first-stage pressure sensor and all second-stage pressure sensors are respectively connected with a controller through signals;
Step two, acquiring an initial pressure value, wherein before the operation after the whole machine is started, the initial pressure value of the total spraying pipeline measured by a first-stage pressure sensor value is P 0, the initial pressure value of each branch pipeline measured by each second-stage pressure sensor is P i, and i is the number of each branch pipeline;
Step three, calculating initial pressure difference values between the branch pipelines and the total spraying pipeline, and calculating and storing the pressure difference delta P i0 between the branch pipelines and the total spraying pipeline in an initial state according to the pressure values measured in the step two by the controller:
△Pi0=P0-Pi;
collecting real-time pressure values in the operation process, and simultaneously collecting the pressure values of all pipelines by a first-stage pressure sensor and all second-stage pressure sensors according to a set time interval in the operation process and transmitting data to a controller, wherein the pressure value of the total spraying pipeline at the moment t is measured by the first-stage pressure sensor to be P 0t, and the pressure value of each branch pipeline at the moment t is measured by each second-stage pressure sensor to be P it;
Step five, calculating a pressure difference delta P it at a time t between each branch pipeline and the total spraying pipeline in the operation process:
△Pit=P0t-Pit;
step six, judging the blocking state of each branch pipeline, comparing and judging the blocking state according to the initial pressure difference value in the step three and the pressure difference value at the moment t in the step five, judging that the branch pipeline is unblocked when the ratio of delta P it/△Pi0 exceeds a first threshold value, judging that the branch pipeline is partially blocked when the ratio of delta P it/△Pi0 is between the first threshold value and a second threshold value, keeping paying attention, and judging that the branch pipeline is severely blocked when the ratio of delta P it/△Pi0 does not reach the second threshold value;
And step seven, judging that the whole machine can continue operation, when the number proportion of the seriously blocked branch pipelines judged in the step six reaches a set value or the adjacent branch pipelines are continuously judged to be severely blocked, alarming and stopping for maintenance are needed, and if one of the two conditions is not met, continuing operation.
Because the spraying agent is different in viscosity and different in construction width and spraying amount required by working conditions, the pressure difference of the pipeline is different, and the blocking condition of the spraying opening can be accurately judged only under the condition that the spraying agent is the same and the spraying amount is the same through the pressure difference.
Therefore, before the whole machine works after starting, the first-stage pressure sensor needs to measure the initial pressure value of the total spraying pipeline, each second-stage pressure sensor respectively measures the initial pressure value of each branch pipeline, and the controller calculates the pressure difference value between each branch pipeline and the total spraying pipeline in the initial state. The method comprises the steps of collecting pressure values in real time in the operation process, collecting pressure values of all pipelines simultaneously by a first-stage pressure sensor and all second-stage pressure sensors according to a set time interval in the operation process, and calculating pressure difference values at t moments between each branch pipeline and a total spraying pipeline in the operation process by a controller. The clogged state is determined by comparing the pressure difference between the initial state and the real-time state.
The pressure sensor with small volume and low cost can realize the real-time monitoring of the blocking condition of each branch pipeline, thereby improving the product performance of the whole machine and reducing the cost.
In order to further accurately determine the blocking state of each branch line, the method for determining the blocking state of each branch line in the sixth step is preferably as follows:
Calculating the ratio of DeltaP it/△Pi0, wherein the first threshold value is 0.8, and the second threshold value is 0.5;
when the ratio is greater than 0.8, the operation can be continued after the smoothness is judged;
when the ratio is between 0.5 and 0.8, the partial blockage is judged, the operation can be continued, and the branch pipeline needs to be continuously focused;
when the ratio is less than 0.5, serious clogging is judged.
When a branch line is completely blocked, the pressure value of the branch line is equal to the pressure value of the total spray line, and DeltaP it is zero, and when DeltaP it is closer to P 0t in the initial state, the branch line is more unblocked. The blockage state of each branch pipeline can be accurately judged by comparing the pressure difference value calculated by the pressure value measured by the pressure sensor with the pressure value change condition.
In order to accurately grasp the spray amount of emulsified asphalt in each branch pipeline, the blocking state of each branch pipeline is qualitatively determined in the sixth step, and the real-time flow value q it of each branch pipeline is quantitatively calculated according to the pressure difference value, and the specific calculation method is as follows:
qit=πd4 •△Pit/(128μl)
Where d is the diameter of the elongated hole, μ is the viscosity of the liquid, and l is the length of the elongated hole.
The real-time flow of the branch pipeline can be calculated through the formula controller, the total spraying quantity is calculated, and meanwhile, the data can be accurately displayed in the instrument in real time, so that an accurate data basis is provided for construction quality and progress.
As can be seen from the above formula, the flow rate of the slender hole is in direct proportion to the front-back pressure difference of the pipeline, the larger the pressure difference is, the larger the flow rate is, and the flow rate condition of the pipeline can be known by displaying the pressure difference of the pipeline because each branch pipeline is fixed in diameter, length and liquid viscosity, and the smaller the pressure difference is, the smaller the flow rate of the pipeline is indicated, so that the more serious the blocking condition of the spraying port is indicated.
Preferably, in order to confirm the construction quality, the criterion for determining whether the whole machine can continue the operation in the seventh step is that the maintenance is required to be stopped when the number of the serious blockage of the branch pipe determined in the sixth step is 30% or more. When the number of the serious blockage of the branch pipelines reaches 30%, the spraying amount of the emulsified asphalt can not reach the construction requirement, so that the construction quality is affected, the machine is required to be stopped for maintenance, and the spray head is dredged.
Preferably, in order to confirm the construction quality, the criterion for determining whether the whole machine can continue the operation in the seventh step is that the maintenance is required to be stopped when two or three adjacent branch pipes are continuously determined to be severely blocked. When adjacent branch pipelines are seriously blocked, the uniformity of emulsified asphalt spraying can be affected, the construction quality is further affected, shutdown maintenance is needed, and the spray head is dredged.
The system for realizing the blockage alarm method of the spraying device of the pavement cold recycling machine comprises a spraying pump, a flow dividing valve block and at least two groups of electric control spray heads, wherein the spraying pump is connected with the flow dividing valve block through a total spraying pipeline, the flow dividing valve block is connected with each electric control spray head through a branch pipeline respectively, a first-stage pressure sensor is arranged in the total spraying pipeline, second-stage pressure sensors are arranged on the branch pipelines, and the first-stage pressure sensor and all the second-stage pressure sensors are connected with a controller through signals respectively.
The invention can realize the monitoring of the pressure value between the total spraying pipeline and each branch pipeline by adopting the pressure sensor with small volume and low cost, and judges the blocking condition of each branch pipeline by the measured pressure difference value between the total spraying pipeline and the branch pipeline, thereby avoiding the adoption of the flowmeter with larger volume and higher cost to measure the flow, and leading the real-time unblocked condition monitoring of each branch pipeline to be a feasible scheme.
The preferred item, in order that operating personnel can more conveniently grasp the jam condition of each branch pipeline intuitively and realize reporting to the police, including installing the display in the driver's cabin, be equipped with the display area that corresponds with each branch pipeline on the display respectively, every display area all includes green pilot lamp, yellow pilot lamp and red pilot lamp, and the controller is connected with the pilot lamp control in each branch pipeline display area respectively.
The controller dynamically calculates the ratio of DeltaP it/△Pi0, when the ratio of DeltaP it/△Pi0 is larger than 0.8, the green indicator lamp works, when the ratio of DeltaP it/△Pi0 is smaller than 0.8 and larger than 0.5, the yellow indicator lamp works, and when the ratio of DeltaP it/△Pi0 is smaller than 0.5, the red indicator lamp works and flashes. The blocking condition is prompted through the green indicator lamp, the yellow indicator lamp and the red indicator lamp, so that the device is more visual and reliable.
Preferably, in order to facilitate the operator to grasp the real-time flow condition of each branch pipeline, each display area includes a flow display, and the controller is respectively connected with the flow display of each branch pipeline display area in a signal manner. The controller displays the calculated flow values of the branch pipelines in a digital form in a flow display, so that operators can know the flow values of the current branch pipelines in real time.
The preferred option, in order to be able to conveniently and accurately obtain the initial pressure value, includes a status value key installed in the cab. The acquisition time of the initial pressure value is before the operation after the whole machine is started, but the acquisition of the time and whether each branch pipeline is in an unblocked state at the moment need to be confirmed afterwards by an operator, and the initial pressure value acquired after the confirmation is more accurate and has reference significance, so that the initial pressure value can be acquired more accurately through the manual operation state value-taking key.
The invention has the advantages that the blocking condition of each branch pipeline can be more accurately judged by comparing the pressure difference value of the initial state and the real-time state on the premise of the same construction condition and working condition, and the blocking condition of each branch pipeline can be monitored in real time by adopting the pressure sensor with small volume and low cost, thereby improving the product performance of the whole machine and reducing the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of the present invention;
FIG. 2 is a flow chart of a method for determining severe blockage according to the present invention;
FIG. 3 is a schematic diagram of a system of the present invention;
Fig. 4 is a schematic diagram of a control display of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
As shown in FIG. 1, the method for alarming blockage of the spraying device of the road surface cold recycling machine comprises the following steps:
The method comprises the steps that firstly, a first-stage pressure sensor is arranged in a main spraying pipeline, sequencing and numbering are carried out on each branch pipeline, a second-stage pressure sensor is respectively arranged in each branch pipeline, and the first-stage pressure sensor and all second-stage pressure sensors are respectively connected with a controller through signals;
Step two, acquiring an initial pressure value, wherein before the whole machine is started, the initial pressure value of a total spraying pipeline measured by a first-stage pressure sensor is P 0, the initial pressure value of each branch pipeline measured by each second-stage pressure sensor is P i, and i is the number of each branch pipeline;
Step three, calculating initial pressure difference values between the branch pipelines and the total spraying pipeline, and calculating and storing the pressure difference delta P i0 between the branch pipelines and the total spraying pipeline in an initial state according to the pressure values measured in the step two by the controller:
△Pi0=P0-Pi;
collecting real-time pressure values in the operation process, and simultaneously collecting the pressure values of all pipelines by a first-stage pressure sensor and all second-stage pressure sensors according to a set time interval in the operation process and transmitting data to a controller, wherein the pressure value of the total spraying pipeline at the moment t is measured by the first-stage pressure sensor to be P 0t, and the pressure value of each branch pipeline at the moment t is measured by each second-stage pressure sensor to be P it;
Step five, calculating a pressure difference delta P it at a time t between each branch pipeline and the total spraying pipeline in the operation process:
△Pit=P0t-Pit;
step six, judging the blocking state of each branch pipeline, comparing and judging the blocking state according to the initial pressure difference value in the step three and the pressure difference value at the moment t in the step five, judging that the branch pipeline is unblocked when the ratio of delta P it/△Pi0 exceeds a first threshold value, judging that the branch pipeline is partially blocked when the ratio of delta P it/△Pi0 is between the first threshold value and a second threshold value, keeping paying attention, and judging that the branch pipeline is severely blocked when the ratio of delta P it/△Pi0 does not reach the second threshold value;
And step seven, judging that the whole machine can continue operation, when the number proportion of the seriously blocked branch pipelines judged in the step six reaches a set value or the adjacent branch pipelines are continuously judged to be severely blocked, alarming and stopping for maintenance are needed, and if one of the two conditions is not met, continuing operation.
Because the spraying agent is different in viscosity and different in construction width and spraying amount required by working conditions, the pressure difference of the pipeline is different, and the blocking condition of the spraying opening can be accurately judged only under the condition that the spraying agent is the same and the spraying amount is the same through the pressure difference.
Therefore, before the whole machine works after starting, the first-stage pressure sensor needs to measure the initial pressure value of the total spraying pipeline, each second-stage pressure sensor respectively measures the initial pressure value of each branch pipeline, and the controller calculates the pressure difference value between each branch pipeline and the total spraying pipeline in the initial state. The method comprises the steps of collecting pressure values in real time in the operation process, collecting pressure values of all pipelines simultaneously by a first-stage pressure sensor and all second-stage pressure sensors according to a set time interval in the operation process, and calculating pressure difference values at t moments between each branch pipeline and a total spraying pipeline in the operation process by a controller. The clogged state is determined by comparing the pressure difference between the initial state and the real-time state.
The pressure sensor with small volume and low cost can realize the real-time monitoring of the blocking condition of each branch pipeline, thereby improving the product performance of the whole machine and reducing the cost.
As shown in fig. 2, in order to further accurately determine the clogged state of each branch pipe, the method of determining the clogged state of each branch pipe in the sixth step is as follows:
Calculating the ratio of DeltaP it/△Pi0, wherein the first threshold value is 0.8, and the second threshold value is 0.5;
when the ratio is greater than 0.8, the operation can be continued after the smoothness is judged;
when the ratio is between 0.5 and 0.8, the partial blockage is judged, the operation can be continued, and the branch pipeline needs to be continuously focused;
when the ratio is less than 0.5, serious clogging is judged.
When a branch line is completely blocked, the pressure value of the branch line is equal to the pressure value of the total spray line, and DeltaP it is zero, and when DeltaP it is closer to P 0t in the initial state, the branch line is more unblocked. The blockage state of each branch pipeline can be accurately judged by comparing the pressure difference value calculated by the pressure value measured by the pressure sensor with the pressure value change condition.
In order to accurately grasp the spraying amount of the emulsified asphalt of each branch pipeline, in the sixth step, the blocking state of each branch pipeline is qualitatively determined, and the real-time flow value q it of each branch pipeline is quantitatively calculated according to the pressure difference value, and the specific calculation method is as follows:
qit=πd4 •△Pit/(128μl)
Where d is the diameter of the elongated hole, μ is the viscosity of the liquid, and l is the length of the elongated hole.
The real-time flow of the branch pipeline can be calculated through the formula controller, and the total spraying quantity is calculated, so that the data can be accurately displayed in the instrument in real time as shown in fig. 4, and an accurate data basis is provided for construction quality and progress.
As can be seen from the above formula, the flow rate of the slender hole is in direct proportion to the front-back pressure difference of the pipeline, the larger the pressure difference is, the larger the flow rate is, and the flow rate condition of the pipeline can be known by displaying the pressure difference of the pipeline because each branch pipeline is fixed in diameter, length and liquid viscosity, and the smaller the pressure difference is, the smaller the flow rate of the pipeline is indicated, so that the more serious the blocking condition of the spraying port is indicated.
In order to confirm the construction quality, the criterion for determining that the whole machine can continue the operation in the seventh step is that the maintenance is required to be stopped when the number of the serious blockage of the branch pipes determined in the sixth step is 30% or more. When the number of the serious blockage of the branch pipelines reaches 30%, the spraying amount of the emulsified asphalt can not reach the construction requirement, so that the construction quality is affected, the machine is required to be stopped for maintenance, and the spray head is dredged.
In order to confirm the construction quality, the criterion for determining that the whole machine can continue the operation in the seventh step is that the maintenance is required to be stopped when two or three adjacent branch pipes are continuously determined to be severely blocked. When adjacent branch pipelines are seriously blocked, the uniformity of emulsified asphalt spraying can be affected, the construction quality is further affected, shutdown maintenance is needed, and the spray head is dredged.
As shown in fig. 3, the system for realizing the blockage alarm method of the spraying device of the road surface cold recycling machine comprises a spraying pump, a flow dividing valve block and at least two groups of electric control spray heads, wherein the spraying pump is connected with the flow dividing valve block through a total spraying pipeline, the flow dividing valve block is connected with each electric control spray head through a branch pipeline respectively, a first-stage pressure sensor is arranged in the total spraying pipeline, second-stage pressure sensors are arranged in the branch pipeline, and the first-stage pressure sensor and all the second-stage pressure sensors are respectively connected with a controller through signals.
The invention can realize the monitoring of the pressure value between the total spraying pipeline and each branch pipeline by adopting the pressure sensor with small volume and low cost, and judges the blocking condition of each branch pipeline by the measured pressure difference value between the total spraying pipeline and the branch pipeline, thereby avoiding the adoption of the flowmeter with larger volume and higher cost to measure the flow, and leading the real-time unblocked condition monitoring of each branch pipeline to be a feasible scheme.
As shown in fig. 4, in order to make the operator more convenient and intuitively grasp the blocking condition of each branch pipeline and realize alarm, the device comprises a display 2 installed in a cab, the display 2 is respectively provided with display areas corresponding to each branch pipeline, each display area comprises a green indicator lamp 21, a yellow indicator lamp 22 and a red indicator lamp 23, and a controller is respectively connected with the indicator lamps of the display areas of each branch pipeline in a control manner.
The controller dynamically calculates the ratio of DeltaP it/△Pi0, when DeltaP it/△Pi0 is larger than 0.8, the green indicator lamp 21 works, when DeltaP it/△Pi0 is smaller than 0.8 and larger than 0.5, the yellow indicator lamp 22 works, and when DeltaP it/△Pi0 is smaller than 0.5, the red indicator lamp 23 works and blinks. The blocking condition is prompted through the green indicator lamp 21, the yellow indicator lamp 22 and the red indicator lamp 23, so that the blocking condition is more visual and reliable.
In order to facilitate the operator to grasp the real-time flow conditions of the branch pipelines, each display area comprises a flow display 24, and the controller is respectively connected with the flow display 24 of each display area of the branch pipeline in a signal manner. The controller displays the calculated flow values of the branch pipelines in a digital form in the flow display 24, so that operators can conveniently know the flow values of the current branch pipelines in real time.
In order to be able to conveniently and accurately acquire the initial pressure value, a state value key 1 is arranged in a cab. The acquisition time of the initial pressure value is before the operation after the whole machine is started, but the acquisition of the time and whether each branch pipeline is in an unblocked state at the moment need to be confirmed afterwards by an operator, and the initial pressure value acquired after the confirmation is more accurate and has reference significance, so that the initial pressure value can be acquired more accurately through the manual operation state value-taking key.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The blockage alarm method for the spraying device of the road surface cold recycling machine is characterized by comprising the following steps of:
The method comprises the steps that firstly, a first-stage pressure sensor is arranged in a main spraying pipeline, sequencing and numbering are carried out on each branch pipeline, a second-stage pressure sensor is respectively arranged in each branch pipeline, and the first-stage pressure sensor and all second-stage pressure sensors are respectively connected with a controller through signals;
Step two, acquiring an initial pressure value, wherein before the whole machine is started, the initial pressure value of a total spraying pipeline measured by a first-stage pressure sensor is P 0, the initial pressure value of each branch pipeline measured by each second-stage pressure sensor is P i, and i is the number of each branch pipeline;
Step three, calculating initial pressure difference values between the branch pipelines and the total spraying pipeline, and calculating and storing the pressure difference delta P i0 between the branch pipelines and the total spraying pipeline in an initial state according to the pressure values measured in the step two by the controller:
△Pi0 =P0-Pi;
collecting real-time pressure values in the operation process, and simultaneously collecting the pressure values of all pipelines by a first-stage pressure sensor and all second-stage pressure sensors according to a set time interval in the operation process and transmitting data to a controller, wherein the pressure value of the total spraying pipeline at the moment t is measured by the first-stage pressure sensor to be P 0t, and the pressure value of each branch pipeline at the moment t is measured by each second-stage pressure sensor to be P it;
Step five, calculating a pressure difference delta P it at a time t between each branch pipeline and the total spraying pipeline in the operation process:
△Pit =P0t-Pit;
step six, judging the blocking state of each branch pipeline, comparing and judging the blocking state according to the initial pressure difference value in the step three and the pressure difference value at the moment t in the step five, judging that the branch pipeline is unblocked when the ratio of delta P it/△Pi0 exceeds a first threshold value, judging that the branch pipeline is partially blocked when the ratio of delta P it/△Pi0 is between the first threshold value and a second threshold value, keeping paying attention, and judging that the branch pipeline is severely blocked when the ratio of delta P it/△Pi0 does not reach the second threshold value;
And step seven, judging that the whole machine can continue operation, when the number proportion of the seriously blocked branch pipelines judged in the step six reaches a set value or the adjacent branch pipelines are continuously judged to be severely blocked, alarming and stopping for maintenance are needed, and if one of the two conditions is not met, continuing operation.
2. The method for warning of blockage of a sprinkler of a road surface cold recycling machine according to claim 1, wherein the method for determining the blockage status of each branch pipe in the sixth step is as follows:
Calculating the ratio of DeltaP it/△Pi0, wherein the first threshold value is 0.8, and the second threshold value is 0.5;
when the ratio is greater than 0.8, the operation can be continued after the smoothness is judged;
when the ratio is between 0.5 and 0.8, the partial blockage is judged, the operation can be continued, and the branch pipeline needs to be continuously focused;
when the ratio is less than 0.5, serious clogging is judged.
3. The method for warning of blockage of a spraying device of a road surface cold recycling machine according to claim 1, wherein in the step six, the blockage state of each branch pipeline is qualitatively determined, and the real-time flow value q it of each branch pipeline is quantitatively calculated according to the pressure difference value, and the specific calculation method is as follows:
qit=πd4 •△Pit/(128μl)
Where d is the diameter of the elongated hole, μ is the viscosity of the liquid, and l is the length of the elongated hole.
4. The method for warning of blockage of a spraying device of a road surface cold recycling machine according to claim 1, wherein the criterion for judging whether the whole machine can continue to operate in the seventh step is that the machine is required to be stopped for maintenance when the number of serious blockage of the branch pipe judged in the sixth step is 30% or more.
5. The method for warning of a clogged sprinkler of a cold road regenerator according to claim 1, wherein the criterion for determining that the whole machine can continue operation in the seventh step is that the machine is required to be stopped for maintenance when two or three adjacent branch pipes are continuously determined to be severely clogged.
6. A system for realizing the blockage alarm method of the road surface cold recycling machine spraying device disclosed in claim 1 comprises a spraying pump, a flow dividing valve block and at least two groups of electric control spray heads, wherein the spraying pump is connected with the flow dividing valve block through a total spraying pipeline, and the flow dividing valve block is connected with each electric control spray head through a branch pipeline.
7. The system for realizing the blockage alarm method of the spraying device of the road surface cold recycling machine according to claim 6, wherein the system comprises a display (2) arranged in a cab, display areas corresponding to the branch pipelines are respectively arranged on the display (2), each display area comprises a green indicator lamp (21), a yellow indicator lamp (22) and a red indicator lamp (23), and the controller is respectively connected with the indicator lamps of the display areas of the branch pipelines in a control manner.
8. The system for realizing the blockage warning method of the spraying device of the road surface cold recycling machine according to claim 7, wherein each display area comprises a flow display (24), and the controller is respectively connected with the flow display (24) of each branch pipeline display area in a signal mode.
9. The system for realizing the blockage alarm method of the spraying device of the road surface cold recycling machine according to claim 6, which is characterized by comprising a state value key (1) arranged in a cab.
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