Blockage alarm method and system for spraying device of pavement cold recycling machine

Abstract

The invention discloses a blockage alarm method and system for a spraying device of a pavement cold recycling machine. The method comprises the steps of installing equipment, obtaining an initial pressure value, calculating an initial pressure difference value, collecting a real-time pressure value in the operation process, calculating the pressure difference value in the operation process, judging the blockage state of each branch pipeline and judging whether the whole machine can continue to work or not. The system comprises a spraying pump, a diverter valve block, electric control nozzles, a main spraying pipeline for connecting the spraying pump and the diverter valve block, and branch pipelines for connecting the diverter valve block and the electric control nozzles, wherein a first-stage pressure sensor and a second-stage pressure sensor which are in signal connection with a controller are respectively arranged in the main spraying pipeline and the branch pipelines. The method has the beneficial effects that under the premise of the same construction condition and working condition, the pressure difference between the initial state and the real-time state is compared, so that the blockage condition of each branch pipeline is more accurately judged; the pressure sensors which are small in size and low in cost are adopted to achieve real-time monitoring of the blocking condition of each branch pipeline, the product performance of the whole machine is improved, and cost is reduced.

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] Purpose of the invention: The purpose of the present invention is to provide a method and system for alarming the blockage of the spraying device of a pavement cold regeneration machine in order to solve the problem in the prior art that it is impossible to monitor the real-time patency of the nozzles of each branch pipeline. The present invention uses a small and low-cost pressure sensor to monitor the pressure value between the main spray pipeline and each branch pipeline, and determines the blockage of each branch pipeline by measuring the pressure difference between the main pipeline and the branch pipeline, thereby avoiding the use of a large and expensive flow meter to measure the flow, making real-time patency monitoring of each branch pipeline a feasible solution, and can further determine whether it is necessary to shut down for maintenance, thereby improving work efficiency while ensuring work quality.

[0007] Technical solution: A method for alarming the blockage of a spraying device of a road cold regeneration machine, comprising the following steps: 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: Get the initial pressure value. After the whole machine is started and before operation, the first-level pressure sensor measures the initial pressure value of the total spray pipeline as P0, and each second-level 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. The blockage status is determined by comparing the initial pressure difference in step 3 with the pressure difference at time t in step 5. When the blockage status exceeds the first threshold, it is determined to be unblocked; when the blockage status is between the first threshold and the second threshold, it is determined to be partially blocked and continued to be monitored; when the blockage status 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.

[0008] Since different spraying agents have different viscosities, different construction widths and working conditions require different spraying volumes, and thus the pressure difference in the pipeline will be different. Only when the spraying agents and spraying volumes are the same, can the blockage of the spraying port be accurately judged by the size of the pressure difference.

[0009] Therefore, after the whole machine is started and before operation, the first-level pressure sensor needs to measure the initial pressure value of the total spray pipeline, and each second-level pressure sensor measures the initial pressure value of each branch pipeline respectively, and the controller calculates the pressure difference between each branch pipeline and the total spray pipeline in the initial state. The pressure value is collected in real time 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 the controller calculates the pressure difference between each branch pipeline and the total spray pipeline at time t during the operation. The blockage state is determined by comparing the pressure difference between the initial state and the real-time state.

[0010] Under the same construction conditions and working conditions, comparing the pressure difference between the initial state and the real-time state can more accurately determine the blockage status of each branch pipeline; the use of small and low-cost pressure sensors can realize real-time monitoring of the blockage status of each branch pipeline, improve the performance of the entire product and reduce costs.

[0011] Preferably, in order 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: Calculate ΔP it / P 0t 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.

[0012] When a branch pipeline is completely blocked, the pressure value of the branch pipeline is equal to the pressure value of the main spray pipeline. it is zero; when △P it With the initial state P 0t The closer it is, the smoother the branch pipeline is. By calculating the pressure difference value measured by the pressure sensor and comparing the pressure value change, the blockage state of each branch pipeline can be accurately determined.

[0013] Preferably, in order to accurately grasp the spraying amount of emulsified asphalt in each branch pipeline, the blockage state of each branch pipeline is qualitatively determined in step 6, 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 / (128 μl) 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.

[0014] The formula controller can calculate the real-time flow of the branch pipeline and the total spraying volume. At the same time, the data can be displayed in real time and accurately in the instrument, providing accurate data basis for construction quality and progress.

[0015] From the above formula, it can be seen that the flow rate of the slender hole is proportional to the pressure difference before and after 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 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, which indicates that the blockage of the spray port is more serious.

[0016] Preferably, in order to confirm the construction quality, the criterion for determining whether the whole machine can continue to operate in step 7 is that when the number of branch pipes seriously blocked as determined in step 6 reaches 30% or more, the machine needs to be shut down for maintenance. When the number of branch pipes seriously blocked reaches 30%, the amount of emulsified asphalt sprayed will not meet the construction requirements, thus affecting the construction quality, and the machine needs to be shut down for maintenance and the nozzles need to be unblocked.

[0017] Preferably, in order 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 pipes are continuously determined to be seriously blocked, the machine needs to be shut down for maintenance. When the adjacent branch pipes are seriously blocked, it will affect the uniformity of emulsified asphalt spraying, and further affect the construction quality, and it is necessary to shut down for maintenance and dredge the nozzle.

[0018] A system for realizing a blockage alarm method for a spray device of a pavement cold regeneration machine comprises a spray pump, a diverter valve block and at least two groups of electrically controlled nozzles, wherein the spray pump is connected to the diverter valve block via a main spray pipeline, the diverter valve block is connected to each electrically controlled nozzle via a branch pipeline, a first-stage pressure sensor is provided in the main spray pipeline, and second-stage pressure sensors are provided in each branch pipeline, and the first-stage pressure sensor and all second-stage pressure sensors are respectively connected to controller signals.

[0019] The present invention uses a small and low-cost pressure sensor to monitor the pressure values ​​between the main spray pipeline and each branch pipeline. The blockage condition of each branch pipeline is determined by measuring the pressure difference between the main spray pipeline and the branch pipeline, which can avoid using a large and high-cost flow meter to measure the flow rate, making real-time unobstructed monitoring of each branch pipeline a feasible solution.

[0020] The preferred option, in order to enable the operator to more conveniently and intuitively understand the blockage status of each branch pipeline and realize the alarm, includes a display installed in the cab, wherein 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, and the controller is respectively connected to the indicator light control of each branch pipeline display area.

[0021] The controller dynamically calculates △P it / P 0t The ratio of △P it / P 0t The ratio is greater than 0.8, the green indicator light works; when △P it / P 0t The ratio is less than 0.8 and greater than 0.5, the yellow indicator light will work; when △P it / P 0t When the ratio is lower than 0.5, the red indicator light will work and flash. The green, yellow and red indicators are used to indicate the blockage, which is more intuitive and reliable.

[0022] Preferably, in order to facilitate the operator to grasp the real-time flow conditions of each branch pipeline, each display area includes a flow display, and the controller is respectively connected to the flow display signal of each branch pipeline display area. The controller displays the calculated flow value of each branch pipeline in digital form in the flow display, so that the operator can understand the current flow value of each branch pipeline in real time.

[0023] The preferred option includes a status value button installed in the cab in order to conveniently and accurately obtain the initial pressure value. Since the initial pressure value is collected after the whole machine is started and before operation, the timing and whether the branch pipelines are unobstructed at that time require the operator to confirm afterwards. The initial pressure value obtained after confirmation is more accurate and more meaningful. Therefore, the initial pressure value can be obtained more accurately by manually operating the status value button.

[0024] Beneficial effects: Under the premise of the same construction conditions and working conditions, the present invention can more accurately determine the blockage status of each branch pipeline by comparing the pressure difference between the initial state and the real-time state; the use of a small and low-cost pressure sensor can realize real-time monitoring of the blockage status of each branch pipeline, thereby improving the performance of the entire product and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 is a flow chart of the control method of the present invention; Figure 2 This is a flow chart of the severe blockage determination method of the present invention; Figure 3 It is the system principle diagram of the present invention; Figure 4 This is a control display principle diagram of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 therefore cannot be understood as a limitation on the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] like Figure 1 As shown, a method for alarming a blockage of a spraying device of a road surface cold regeneration machine comprises the following steps: 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. The blockage status is determined by comparing the initial pressure difference in step 3 with the pressure difference at time t in step 5. When the blockage status exceeds the first threshold, it is determined to be unblocked; when the blockage status is between the first threshold and the second threshold, it is determined to be partially blocked and continued to be monitored; when the blockage status 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.

[0031] Since different spraying agents have different viscosities, different construction widths and working conditions require different spraying volumes, and thus the pressure difference in the pipeline will be different. Only when the spraying agents and spraying volumes are the same, can the blockage of the spraying port be accurately judged by the size of the pressure difference.

[0032] Therefore, after the whole machine is started and before operation, the first-level pressure sensor needs to measure the initial pressure value of the total spray pipeline, and each second-level pressure sensor measures the initial pressure value of each branch pipeline respectively, and the controller calculates the pressure difference between each branch pipeline and the total spray pipeline in the initial state. The pressure value is collected in real time 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 the controller calculates the pressure difference between each branch pipeline and the total spray pipeline at time t during the operation. The blockage state is determined by comparing the pressure difference between the initial state and the real-time state.

[0033] Under the same construction conditions and working conditions, comparing the pressure difference between the initial state and the real-time state can more accurately determine the blockage status of each branch pipeline; the use of small and low-cost pressure sensors can realize real-time monitoring of the blockage status of each branch pipeline, improve the performance of the entire product and reduce costs.

[0034] like Figure 2 As 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: Calculate ΔP it / P 0t 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.

[0035] When a branch pipeline is completely blocked, the pressure value of the branch pipeline is equal to the pressure value of the main spray pipeline. it is zero; when △P it With the initial state P 0t The closer it is, the smoother the branch pipeline is. By calculating the pressure difference value measured by the pressure sensor and comparing the pressure value change, the blockage state of each branch pipeline can be accurately determined.

[0036] In order to accurately grasp the spraying amount of emulsified asphalt in each branch pipeline, the blockage state of each branch pipeline is qualitatively determined in step 6, 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 / (128 μl) 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.

[0037] The controller can calculate the real-time flow rate of the branch pipeline and the total spraying volume through the formula, such as Figure 4 As shown, the data can be displayed in real time and accurately in the instrument, providing accurate data basis for construction quality and progress.

[0038] From the above formula, it can be seen that the flow rate of the slender hole is proportional to the pressure difference before and after 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 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, which indicates that the blockage of the spray port is more serious.

[0039] In order to confirm the construction quality, the judgment standard for determining whether the whole machine can continue to operate in step 7 is that when the number of branch pipes seriously blocked in step 6 reaches 30% or more, the machine needs to be shut down for maintenance. When the number of branch pipes seriously blocked reaches 30%, the amount of emulsified asphalt sprayed will not meet the construction requirements, thus affecting the construction quality, and the machine needs to be shut down for maintenance and the nozzles need to be unblocked.

[0040] In order to confirm the construction quality, the judgment standard for determining whether the whole machine can continue to operate in step 7 is that when two or three adjacent branch pipes are successively judged to be seriously blocked, the machine needs to be shut down for maintenance. When the adjacent branch pipes are seriously blocked, it will affect the uniformity of emulsified asphalt spraying, and then affect the construction quality, and it is necessary to shut down for maintenance and dredge the nozzle.

[0041] like Figure 3As shown, a system for realizing a blockage alarm method for a spraying device of a pavement cold regeneration machine includes a spraying pump, a diverter valve block and at least two groups of electrically controlled nozzles, the spraying pump and the diverter valve block are connected via a main spraying pipeline, the diverter valve block and each electrically controlled nozzle are connected via a branch pipeline, a first-stage pressure sensor is provided in the main spraying pipeline, and second-stage pressure sensors are provided in the branch pipelines, the first-stage pressure sensor and all second-stage pressure sensors are respectively connected to controller signals.

[0042] The present invention uses a small and low-cost pressure sensor to monitor the pressure values ​​between the main spray pipeline and each branch pipeline. The blockage condition of each branch pipeline is determined by measuring the pressure difference between the main spray pipeline and the branch pipeline, which can avoid using a large and high-cost flow meter to measure the flow rate, making real-time unobstructed monitoring of each branch pipeline a feasible solution.

[0043] like Figure 4 As shown, in order for the operator to more conveniently and intuitively understand the blockage status of each branch pipeline and implement an alarm, a display 2 is included in the cab, and the display 2 is provided with display areas corresponding to each branch pipeline, each display area includes a green indicator light 21, a yellow indicator light 22 and a red indicator light 23, and the controller is respectively connected to the indicator light control of each branch pipeline display area.

[0044] The controller dynamically calculates △P it / P 0t The ratio of △P it / P 0t The ratio is greater than 0.8, the green indicator light 21 works; when △P it / P 0t The ratio is less than 0.8 and greater than 0.5, and the yellow indicator light 22 works; when △P it / P 0t When the ratio is lower than 0.5, the red indicator light 23 works and flashes. The green indicator light 21, the yellow indicator light 22 and the red indicator light 23 are used to indicate the blockage, which is more intuitive and reliable.

[0045] In order to facilitate the operator to grasp the real-time flow conditions of each branch pipeline, 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. The controller displays the calculated flow value of each branch pipeline in digital form in the flow display 24, so that the operator can understand the current flow value of each branch pipeline in real time.

[0046] In order to obtain the initial pressure value conveniently and accurately, a status value button 1 is installed in the cab. Since the initial pressure value is collected after the whole machine is started and before operation, the timing and whether the branch pipelines are unobstructed at that time require the operator to confirm afterwards. 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 by manually operating the status value button.

[0047] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between 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 method part.

[0048] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to 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. The blockage status is determined by comparing the initial pressure difference in step 3 with the pressure difference at time t in step 5. When the blockage status exceeds the first threshold, it is determined to be unblocked; when the blockage status is between the first threshold and the second threshold, it is determined to be partially blocked and continued to be monitored; when the blockage status 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 0t 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 a blockage alarm method for a spray device of a road surface cold regeneration machine, comprising a spray pump, a diverter valve block and at least two groups of electronically controlled nozzles, wherein the spray pump and the diverter valve block are connected via a main spray pipeline, and the diverter valve block and each electronically controlled nozzle are connected via 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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