A Blockage Alarm Method and System for a Spraying Device of a Pavement Cold Recycling Machine

Abstract

The present invention discloses a method and system for blocking alarm of a spraying device of a pavement cold recycling machine. The method includes installing equipment, obtaining an initial pressure value, calculating an initial pressure difference, collecting real-time pressure values during operation, calculating the pressure difference during operation, determining the blocking status of each branch pipeline, and determining whether the whole machine can continue to operate. The system includes a spraying pump, a flow dividing valve block and an electric control spray head, a total spraying pipeline connecting the spraying pump and the flow dividing valve block, branch pipelines connecting the flow dividing valve block and each electric control spray head, and first and second pressure sensors respectively arranged in the total spraying pipeline and the branch pipelines and signal-connected to a controller. Beneficial effects: Under the premise of the same construction conditions and working conditions, the present invention can more accurately determine the blocking situation of each branch pipeline by comparing the pressure differences between the initial state and the real-time state; the real-time monitoring of the blocking situation of each branch pipeline is realized by using pressure sensors with small volume and low cost, which improves the performance of the whole machine product and reduces the cost.

Description

Technical Field

[0001] The invention relates to a monitoring and alarming method and system for important parts of engineering machinery equipment, and in particular to a blocking alarming method and system for a spraying device of a road surface cold regeneration machine, and belongs to the technical field of engineering machinery. Background Art

[0002] The pavement cold recycler is an important construction equipment for on-site cold regeneration of damaged asphalt pavement. When the asphalt pavement and the base layer are mixed by the mixing rotor, water, emulsified asphalt, foamed asphalt and other spraying agents need to be sprayed into the mixing cover through a spraying device. The amount of these spraying agents added has dosage requirements, and their uniformity and dosage have a great impact on the quality of the pavement after cold recycling.

[0003] Chinese patent CN114779840A discloses an electrical control method and control system for automatic spraying of emulsified asphalt in a regenerated machine. The technical solution is to first input preset parameters such as total working width, material density, emulsified asphalt content, and total working width into the controller. Secondly, the controller calculates the asphalt spraying amount based on the preset parameters and the measured vehicle speed and milling depth, and compares it with the measured asphalt flow rate. The PWM current output is adjusted according to the comparison result and the control law, thereby controlling the speed of the asphalt pump for flow control; the asphalt spraying amount is tested in real time by a sensor and fed back to the controller for PID closed-loop adjustment to ensure the emulsified asphalt content required for cold regeneration of the pavement.

[0004] Although this patent has a flow meter sensor on the asphalt pump, the asphalt pump is connected to the spraying pipeline, a number of spraying outlets are opened on the spraying pipeline, spraying solenoid valves are provided at the spraying outlets, and a pressure sensor is provided on the spraying pipeline to cooperate with the controller to provide overpressure protection for the entire system; a spraying indicator light is provided on the control box to display the working status of the spraying solenoid valve. However, if a certain spraying outlet is not spraying smoothly or is blocked, the flow meter sensor of the asphalt pump, the pressure sensor on the spraying pipeline and the spraying indicator light are almost unaffected, and the working condition of each nozzle cannot be accurately judged.

[0005] In addition, Chinese patent CN202533764U discloses a pavement cold regeneration machine spray device status monitoring system. The patent branch uses a flow sensor, but due to the large size and high cost of the flow sensor, it is impossible to install a flow meter in each branch pipeline to monitor the flow of the pipeline. Summary of the invention

[0006] Objective of the Invention: The objective of the present invention is to provide a method and system for blocking alarm of a spraying device of a road cold recycler, aiming at the problem in the prior art that the real-time unblocked situation of the nozzles of each branch pipeline cannot be monitored. The present invention can realize the monitoring of the pressure values between the main spraying pipeline and each branch pipeline by using a pressure sensor with small volume and low cost. By judging the blockage situation of each branch pipeline through the pressure difference between the main pipeline and the branch pipeline measured, it can avoid using a flowmeter with large volume and high cost to measure the flow rate, making it a feasible solution to monitor the real-time unblocked situation of each branch pipeline, and further judge whether it is necessary to stop the machine for maintenance, improving the operation efficiency on the premise of ensuring the operation quality.

[0007] Technical Solution: A method for blocking alarm of a spraying device of a road cold recycler includes the following steps:

[0008] Step 1: Install equipment. A first-level pressure sensor is arranged in the main spraying pipeline, each branch pipeline is sorted and numbered, and a second-level pressure sensor is respectively arranged in each branch pipeline. The first-level pressure sensor and all the second-level pressure sensors are respectively connected with the controller in signal.

[0009] Step 2: Obtain the initial pressure value. Before the operation after the whole machine starts, the first-level pressure sensor measures the initial pressure value of the main spraying pipeline as P 0 , and each second-level pressure sensor respectively measures the initial pressure value of each branch pipeline as P i , where i is the number of each branch pipeline.

[0010] Step 3: Calculate the initial pressure difference between each branch pipeline and the main spraying pipeline. The controller calculates and stores the pressure difference △P i0 between each branch pipeline and the main spraying pipeline in the initial state according to the pressure values measured in Step 2:

[0011] △P i0 =P 0 -P i ;

[0012] Step 4: Collect the real-time pressure values during the operation. During the operation, according to the set time interval, the first-level pressure sensor and all the second-level pressure sensors simultaneously collect the pressure values of all pipelines and transmit the data to the controller. The first-level pressure sensor measures the pressure value of the main spraying pipeline at time t as P 0t ; each second-level pressure sensor respectively measures the pressure value of each branch pipeline at time t as P it ;

[0013] Step 5: Calculate the pressure difference △P it at time t between each branch pipeline and the main spraying pipeline during the operation:

[0014] △P it =P 0t -P it ;

[0015] Step 6. Determine the blockage status of each branch pipeline. Compare the initial pressure difference in Step 3 and the pressure difference at time t in Step 5 to determine the blockage status. When the ratio of △P it / △P i0 exceeds the first threshold, it is determined to be unblocked; when the ratio of △P it / △P i0 is between the first threshold and the second threshold, it is determined to be partially blocked and continuous attention is required; when the ratio of △P it / △P i0 does not reach the second threshold, it is determined to be severely blocked;

[0016] Step 7. Determine whether the whole machine can continue to operate. When the proportion of the number of severely blocked branch pipelines determined in Step 6 reaches the set value, or when adjacent branch pipelines are continuously determined to be severely blocked, an alarm needs to be given and the machine needs to be shut down for maintenance; if neither of the above two conditions is met, the operation continues.

[0017] Since different spraying agents have different viscosities, and different construction widths and working conditions require different spraying amounts, the pressure difference in the pipeline will be different. Only when the spraying agent is the same and the spraying amount is also the same, can the blockage situation of the spraying port be judged more accurately through the size of the pressure difference.

[0018] Therefore, before the operation after the whole machine starts, the first-stage pressure sensor needs to measure the initial pressure value of the total spraying pipeline, and each second-stage pressure sensor measures the initial pressure value of each branch pipeline respectively. The controller calculates the pressure difference between each branch pipeline and the total spraying pipeline in the initial state. During the operation, the pressure value is collected in real time. According to the set time interval during the operation, the first-stage pressure sensor and all second-stage pressure sensors collect the pressure values of all pipelines at the same time, and the controller calculates the pressure difference between each branch pipeline and the total spraying pipeline at time t during the operation. The blockage status is determined by comparing the pressure differences in the initial state and the real-time state.

[0019] On the premise of the same construction conditions and working conditions, comparing the pressure differences in the initial state and the real-time state can more accurately determine the blockage situation of each branch pipeline; using pressure sensors with small volume and low cost can realize the real-time monitoring of the blockage situation of each branch pipeline, improve the performance of the whole machine product and reduce the cost.

[0020] Preferred option. To further accurately determine the blockage status of each branch pipeline, the method for determining the blockage status of each branch pipeline in Step 6 is as follows:

[0021] Calculate △P it / △P i0 The ratio, the first threshold is 0.8, and the second threshold is 0.5;

[0022] When the ratio is greater than 0.8, it is determined to be unobstructed and operation can continue;

[0023] When the ratio is between 0.5 and 0.8, it is determined to be partially blocked, operation can continue, and this branch pipeline needs to be continuously monitored;

[0024] When the ratio is less than 0.5, it is determined to be severely blocked.

[0025] When a certain branch pipeline is completely blocked, the pressure value of this branch pipeline is equal to the pressure value of the total spraying pipeline, and at this time, △P it is zero; when △P it is closer to the initial state of P 0t it indicates that the branch pipeline is more unobstructed. By measuring the pressure value with a pressure sensor and calculating the pressure difference to compare the change of the pressure value, the blockage state of each branch pipeline can be accurately determined.

[0026] Preferred option. In order to accurately master the spraying amount of emulsified asphalt in each branch pipeline, in 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. The specific calculation method is as follows:

[0027] q it =πd 4 •△P it / (128μl)

[0028] In the formula: d is the diameter of the slender hole, μ is the viscosity of the liquid, and l is the length of the slender hole.

[0029] Through the formula controller, the real-time flow of this branch pipeline can be calculated, the total spraying amount can be calculated, and at the same time, the data can be accurately displayed in real time on the instrument, providing accurate data basis for the construction quality and progress.

[0030] From the above formula, it can be seen that the flow of the slender hole is proportional to the pressure difference before and after the pipeline. The greater the pressure difference, the greater the flow. Since the diameter, length and liquid viscosity of each branch pipeline are fixed, the flow condition of the pipeline can be known by displaying the pressure difference of the pipeline. The smaller the pressure difference, the smaller the flow of the pipeline, indicating that the blockage of the spraying port is more serious.

[0031] Preferred option. To confirm the construction quality, the criterion for determining whether the whole machine can continue to operate in step 7 is that when the proportion of the number of severely blocked branch pipelines determined in step 6 reaches 30% or more, it is necessary to stop the machine for maintenance. When the number of severely blocked branch pipelines reaches 30%, the spraying amount of emulsified asphalt cannot meet the construction requirements, thus affecting the construction quality. It is necessary to stop the machine for maintenance and dredge the nozzles.

[0032] Preferred option. To confirm the construction quality, the criterion for determining whether the whole machine can continue to operate in step 7 is that when two or three adjacent branch pipelines are continuously determined to be severely blocked, it is necessary to stop the machine for maintenance. When adjacent branch pipelines are severely blocked, it will affect the uniformity of emulsified asphalt spraying, thus affecting the construction quality. It is necessary to stop the machine for maintenance and dredge the nozzles.

[0033] A system for implementing a method for blocking alarm of a spraying device of a pavement cold recycling machine, including a spraying pump, a flow dividing valve block and at least two groups of electric control nozzles. The spraying pump and the flow dividing valve block are connected through a main spraying pipeline. The flow dividing valve block and each electric control nozzle are respectively connected through a branch pipeline. A first-stage pressure sensor is arranged in the main spraying pipeline, and second-stage pressure sensors are arranged in all branch pipelines. The first-stage pressure sensor and all second-stage pressure sensors are respectively connected with a controller in a signal manner.

[0034] The present invention can monitor the pressure values between the main spraying pipeline and each branch pipeline by using a pressure sensor with a small volume and low cost. The blockage condition of each branch pipeline is determined by the pressure difference between the measured main spraying pipeline and the branch pipeline, which can avoid using a flowmeter with a large volume and high cost, making it a feasible solution to monitor the real-time unblocked condition of each branch pipeline.

[0035] Preferred option. To enable the operator to more conveniently and intuitively master the blockage condition of each branch pipeline and achieve an alarm, it includes a display installed in the cab. The display is respectively provided with display areas corresponding to each branch pipeline. Each display area includes a green indicator light, a yellow indicator light and a red indicator light. The controller is respectively connected with the indicator lights in the display areas of each branch pipeline in a control manner.

[0036] The controller dynamically calculates the ratio of △P it / △P i0 . When the ratio of △P it / △P i0 is greater than 0.8, the green indicator light works; when the ratio of △P it / △P i0 is less than 0.8 and greater than 0.5, the yellow indicator light works; when the ratio of △P it / △P i0When the ratio is lower than 0.5, the red indicator light works and flashes. The green, yellow, and red indicator lights are used to indicate the blockage situation, which is more intuitive and reliable.

[0037] Preferred option. To facilitate the operator to master the real-time flow rate of each branch pipeline, each display area includes a flow rate display, and the controller is respectively connected to the flow rate displays in the display areas of each branch pipeline through signals. The controller displays the calculated flow rate values of each branch pipeline in digital form in the flow rate displays, facilitating the operator to understand the current flow rate values of each branch pipeline in real time.

[0038] Preferred option. To be able to conveniently and accurately obtain the initial pressure value, it includes a status value-taking button installed in the cab. Since the collection time of the initial pressure value is before operation after the whole machine starts, but the timing of this collection and whether each branch pipeline is in a smooth state at that time need to be confirmed by the operator afterwards. Only after confirmation can the obtained initial pressure value be more accurate and more reference-worthy. Therefore, the initial pressure value can be obtained more accurately by manually operating the status value-taking button.

[0039] Beneficial effects: Under the premise of the same construction conditions and working conditions, the present invention can more accurately determine the blockage situation of each branch pipeline by comparing the pressure difference between the initial state and the real-time state; the use of a pressure sensor with a small volume and low cost can realize the real-time monitoring of the blockage situation of each branch pipeline, improving the performance of the whole machine product and reducing the cost. Brief Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative labor.

[0041] Figure 1 It is the flowchart of the control method of the present invention;

[0042] Figure 2 It is the flowchart of the severe blockage determination method of the present invention;

[0043] Figure 3 It is the system schematic diagram of the present invention;

[0044] Figure 4 It is the control display schematic diagram of the present invention. Detailed Embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] 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 the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0047] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0048] As Figure 1 shown, a method for blocking alarm of a spraying device of a pavement cold recycler includes the following steps:

[0049] Step 1: Install the device. A first-stage pressure sensor is arranged in the total spraying pipeline, the branch pipelines are sorted and numbered, and a second-stage pressure sensor is respectively arranged in each branch pipeline. The first-stage pressure sensor and all the second-stage pressure sensors are respectively connected to the controller in signal.

[0050] Step 2: Obtain the initial pressure value. Before the operation after the whole machine starts, the first-stage pressure sensor measures the initial pressure value of the total spraying pipeline as P 0 , and each second-stage pressure sensor respectively measures the initial pressure value of each branch pipeline as P i , where i is the number of each branch pipeline.

[0051] Step 3: Calculate the initial pressure difference between each branch pipeline and the total spraying pipeline. The controller calculates and stores the pressure difference △P i0 between each branch pipeline and the total spraying pipeline in the initial state according to the pressure values measured in Step 2:

[0052] △P i0 = P 0 - P i ;

[0053] Step Four: Collect the real-time pressure values during the operation process. During the operation process, according to the set time interval, the first-stage pressure sensor and all second-stage pressure sensors simultaneously collect the pressure values of all pipelines and transmit the data to the controller; the pressure value measured by the first-stage pressure sensor at time t of the total spraying pipeline is P 0t ; the pressure values measured by each second-stage pressure sensor at time t of each branch pipeline are P it ;

[0054] Step Five: Calculate the pressure difference △P at time t between each branch pipeline and the total spraying pipeline it :

[0055] △P it = P 0t - P it ;

[0056] Step Six: Determine the blockage status of each branch pipeline. Compare the initial pressure difference in Step Three and the pressure difference at time t in Step Five to determine the blockage status. When the ratio of △P it / △P i0 exceeds the first threshold, it is determined to be unblocked; when the ratio of △P it / △P i0 is between the first threshold and the second threshold, it is determined to be partially blocked and continuous attention is required; when the ratio of △P it / △P i0 does not reach the second threshold, it is determined to be severely blocked;

[0057] Step Seven: Determine whether the whole machine can continue to operate. When the proportion of the severely blocked branch pipelines determined in Step Six reaches the set value, or when adjacent branch pipelines are continuously determined to be severely blocked, it is necessary to alarm and stop for maintenance; if neither of the above two conditions is met, continue to operate.

[0058] Since the viscosities of different spraying agents are different, and the spraying amounts required for different construction widths and working conditions are also different, the pressure differences of the pipelines will vary. Only when the spraying agents are the same and the spraying amounts are the same, can the blockage situation of the spraying nozzles be more accurately judged by the magnitude of the pressure difference.

[0059] Therefore, before the operation after the whole machine starts, the first-stage pressure sensor needs to measure the initial pressure value of the total spraying pipeline, and each second-stage pressure sensor measures the initial pressure value of each branch pipeline respectively. The controller calculates the pressure difference between each branch pipeline and the total spraying pipeline in the initial state. During the operation, the pressure values are collected in real time. According to the set time interval during the operation, the first-stage pressure sensor and all second-stage pressure sensors collect the pressure values of all pipelines at the same time. The controller calculates the pressure difference between each branch pipeline and the total spraying pipeline at time t during the operation. The blockage state is determined by comparing the pressure differences in the initial state and the real-time state.

[0060] On the premise of the same construction conditions and working conditions, comparing the pressure differences in the initial state and the real-time state can more accurately determine the blockage situation of each branch pipeline; using pressure sensors with small volume and low cost can realize the real-time monitoring of the blockage situation of each branch pipeline, improve the performance of the whole machine product and reduce the cost.

[0061] As Figure 2 shown, in order to further accurately determine the blockage state of each branch pipeline, the method for determining the blockage state of each branch pipeline in step six is as follows:

[0062] Calculate the ratio of △P it / △P i0 , the first threshold is 0.8, and the second threshold is 0.5;

[0063] When the ratio is greater than 0.8, it is determined to be unblocked and the operation can continue;

[0064] When the ratio is between 0.5 and 0.8, it is determined to be partially blocked, and the operation can continue. It is necessary to continuously pay attention to this branch pipeline;

[0065] When the ratio is less than 0.5, it is determined to be severely blocked.

[0066] When a certain branch pipeline is completely blocked, the pressure value of this branch pipeline is equal to the pressure value of the total spraying pipeline. At this time, △P it is zero; when △P it is closer to P 0t in the initial state, it indicates that this branch pipeline is more unblocked. By measuring the pressure value with a pressure sensor, calculating the pressure difference and comparing the change of the pressure value, the blockage state of each branch pipeline can be accurately determined.

[0067] In order to accurately master the spraying amount of emulsified asphalt in each branch pipeline, in 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. The specific calculation method is as follows:

[0068] q it =πd4 •△P it / (128 μl)

[0069] Where: d is the diameter of the slender hole, μ is the viscosity of the liquid, and l is the length of the slender hole.

[0070] Through the formula controller, the real-time flow rate of the branch pipeline can be calculated, and the total spraying volume can be calculated. As Figure 4 shown, the data can be accurately displayed in real time on the instrument, providing accurate data basis for the construction quality and progress.

[0071] It can be seen from the above formula that the flow rate of the slender hole is proportional to the pressure difference between the front and back of the pipeline. The greater the pressure difference, the greater the flow rate. Since the diameter, length and liquid viscosity of each branch pipeline are fixed, the flow rate condition of the pipeline can be known by displaying the pressure difference of the pipeline. The smaller the pressure difference, the smaller the flow rate of the pipeline, indicating that the blockage of the spraying port is more serious.

[0072] To confirm the construction quality, the judgment criterion for determining whether the whole machine can continue to operate in step seven is that when the proportion of the number of severely blocked branch pipelines determined in step six reaches 30% and above, it is necessary to stop the machine for maintenance. When the number of severely blocked branch pipelines reaches 30%, the spraying volume of emulsified asphalt cannot meet the construction requirements, which will affect the construction quality. It is necessary to stop the machine for maintenance and dredge the nozzles.

[0073] To confirm the construction quality, the judgment criterion for determining whether the whole machine can continue to operate in step seven is that when two or three adjacent branch pipelines are continuously determined to be severely blocked, it is necessary to stop the machine for maintenance. When adjacent branch pipelines are severely blocked, it will affect the uniformity of emulsified asphalt spraying, which will affect the construction quality. It is necessary to stop the machine for maintenance and dredge the nozzles.

[0074] As Figure 3 shown, a system for realizing the blockage alarm method of the spraying device of a pavement cold recycling machine includes a spraying pump, a shunt valve block and at least two groups of electric control nozzles. The spraying pump and the shunt valve block are connected through a total spraying pipeline. The shunt valve block and each electric control nozzle are respectively connected through a branch pipeline. A first-stage pressure sensor is arranged in the total spraying pipeline, and a second-stage pressure sensor is arranged in each branch pipeline. The first-stage pressure sensor and all second-stage pressure sensors are respectively connected with the controller in signal.

[0075] The present invention can realize the monitoring of the pressure values between the total spraying pipeline and each branch pipeline by using a pressure sensor with small volume and low cost. By judging the blockage situation of each branch pipeline through the measured pressure difference between the total spraying pipeline and the branch pipeline, it is possible to avoid using a flow meter with large volume and high cost, making it a feasible solution to monitor the real-time unblocked situation of each branch pipeline.

[0076] As Figure 4 shown, in order for the operator to more conveniently and intuitively grasp the blockage conditions of each branch pipeline and implement an alarm, it includes a display 2 installed in the cab. Display areas corresponding to each branch pipeline are respectively provided on the display 2. Each display area includes a green indicator light 21, a yellow indicator light 22, and a red indicator light 23. The controller is respectively connected to the indicator lights in the display areas of each branch pipeline for control.

[0077] The controller dynamically calculates the ratio of △P it / △P i0 When the ratio of △P it / △P i0 is greater than 0.8, the green indicator light 21 works; when the ratio of △P it / △P i0 is less than 0.8 and greater than 0.5, the yellow indicator light 22 works; when the ratio of △P it / △P i0 is lower than 0.5, the red indicator light 23 works and flashes. The blockage conditions are prompted through the green indicator light 21, the yellow indicator light 22, and the red indicator light 23, which is more intuitive and reliable.

[0078] In order for the operator to conveniently grasp the real-time flow rate conditions of each branch pipeline, each display area includes a flow rate display 24. The controller is respectively connected to the flow rate displays 24 in the display areas of each branch pipeline for signals. The controller respectively displays the calculated flow rate values of each branch pipeline in digital form in the flow rate display 24, facilitating the operator to understand the current flow rate values of each branch pipeline in real time.

[0079] In order to be able to conveniently and accurately obtain the initial pressure value, it includes a status value-taking button 1 installed in the cab. Since the acquisition timing of the initial pressure value is before the operation after the whole machine starts, but the grasp of this timing and whether each branch pipeline is in a smooth state at that time need to be confirmed by the operator afterwards. Only the initial pressure value obtained after confirmation is more accurate and has more reference significance. Therefore, the initial pressure value can be obtained more accurately through manual operation of the status value-taking button.

[0080] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred 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 parts can be referred to the description of the method part.

[0081] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present 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

1. A method for alarming blockage of a spraying device of a road surface cold regeneration machine, characterized in that: The following steps are involved: Step 1: Install the equipment. A first-stage pressure sensor is arranged in the main spraying pipeline. Each branch pipeline is numbered and sorted. A second-stage pressure sensor is arranged in each branch pipeline. The first-stage pressure sensor and all second-stage pressure sensors are respectively connected to the controller signal. Step 2: Obtain the initial pressure value. After the whole machine is started and before operation, the first-stage pressure sensor measures the initial pressure value of the total spray pipeline as P0, and each second-stage pressure sensor measures the initial pressure value of each branch pipeline as P i , i is the number of each branch pipeline; Step 3: Calculate the initial pressure difference between each branch pipeline and the main spray pipeline. The controller calculates and stores the initial pressure difference △P between each branch pipeline and the main spray pipeline according to the pressure value measured in step 2. i0 : △P i0 =P0-P i ; Step 4: Collect the real-time pressure value during the operation. During the operation, according to the set time interval, the first-level pressure sensor and all second-level pressure sensors simultaneously collect the pressure values ​​of all pipelines and transmit the data to the controller; the pressure value of the total spraying pipeline at time t measured by the first-level pressure sensor is P 0t ; Each second-stage pressure sensor measures the pressure value of each branch pipeline at time t as P it ; Step 5: Calculate the pressure difference △P between each branch pipeline and the main spray pipeline at time t during the operation it : △P it =P 0t -P it ; Step 6: Determine the blockage status of each branch pipeline by comparing the initial pressure difference in step 3 with the pressure difference at time t in step 5. it / △P i0 When the ratio exceeds the first threshold, it is determined to be unobstructed; when △P it / △P i0 When the ratio of is between the first threshold and the second threshold, it is judged as partial blockage and continued attention is paid; when △P it / △P i0 When the ratio of does not reach the second threshold, it is determined to be severely blocked; Step 7: Determine whether the whole machine can continue to operate. When the proportion of the branch pipelines that are severely blocked as determined in step 6 reaches the set value, or the adjacent branch pipelines are continuously determined to be severely blocked, an alarm is required and the machine is shut down for maintenance; if one of the above two conditions is not met, the operation continues.

2. The method for clogging alarm of a spraying device of a road surface cold regeneration machine according to claim 1 is characterized in that: The method for determining the blockage status of each branch pipeline in step 6 is as follows: Calculate ΔP it / △P i0 The first threshold is 0.8 and the second threshold is 0.5; When the ratio is greater than 0.8, it is determined to be unobstructed and the operation can continue; When the ratio is between 0.5 and 0.8, it is judged as partial blockage and the operation can continue, but the branch pipeline needs to be continuously monitored; When the ratio is less than 0.5, it is judged as severe blockage.

3. The method for clogging alarm of a spraying device of a road surface cold regeneration machine according to claim 1, characterized in that: In step 6, the blockage state of each branch pipeline is qualitatively determined, and the real-time flow value q of each branch pipeline is quantitatively calculated according to the pressure difference. it , the specific calculation method is as follows: q it =πd 4 •△P it / (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 clogging alarm of a spraying device of a road surface cold regeneration machine according to claim 1, characterized in that: The criterion for determining whether the whole machine can continue to operate in step seven is that when the number of branch pipelines seriously blocked as determined in step six reaches 30% or more, the machine needs to be shut down for maintenance.

5. The method for clogging alarm of a spraying device of a road surface cold regeneration machine according to claim 1, characterized in that: The criterion for determining whether the whole machine can continue to operate in step seven is that the machine needs to be shut down for maintenance when two or three adjacent branch pipelines are successively determined to be severely blocked.

6. A system for realizing the blockage alarm method of the spraying device of the road surface cold regeneration machine according to claim 1, comprising a spraying pump, a diverter valve block and at least two groups of electronically controlled nozzles, wherein the spraying pump is connected to the diverter valve block through a main spraying pipeline, and the diverter valve block is connected to each electronically controlled nozzle through a branch pipeline, characterized in that: The main spray pipeline is provided with a first-stage pressure sensor, and the branch pipelines are all provided with second-stage pressure sensors. The first-stage pressure sensor and all second-stage pressure sensors are respectively connected to controller signals.

7. The system for realizing the blockage alarm method of the spraying device of the road surface cold regeneration machine according to claim 6 is characterized in that: The invention comprises a display (2) installed in a cab, wherein the display (2) is provided with display areas corresponding to each branch pipeline, each display area comprises a green indicator light (21), a yellow indicator light (22) and a red indicator light (23), and a controller is respectively connected to the indicator light control of each branch pipeline display area.

8. The system for realizing the blockage alarm method of the spraying device of the road surface cold regeneration machine according to claim 7 is characterized in that: Each display area includes a flow display (24), and the controller is respectively connected to the flow display (24) of each branch pipeline display area by signal.

9. The system for realizing the blockage alarm method of the spraying device of the road surface cold regeneration machine according to claim 6 is characterized in that: It includes a status value button (1) installed in the cab.

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