Artificial dirt spraying system and method for insulator

Abstract

The invention relates to the technical field of insulator pollution tests, and provides an insulator artificial pollution spraying system and method.Sensor data are integrated through a control system, a user inputs an insulator model and preset equivalent dust density value information through a control panel, and the system automatically sets and manages optimal spraying parameters; and the error risk of manual operation is reduced, and the uniformity and stability of the spraying process are guaranteed. In addition, the system can monitor the residual amount of dirty powder in real time, a user can be reminded to add the dirty powder in time when the residual amount of the dirty powder is insufficient, the spraying operation is prevented from being affected, dirty covering schemes of various insulator models are built in, equipment parameters are automatically set, automatic gradient dirty covering of the sample insulators is achieved, and the working efficiency is improved. The surface pollution covering coefficient alpha is obtained through test fitting, and predicted working duration information can be rapidly obtained in combination with a predicted working duration calculation formula.

Description

Technical Field

[0001] The invention relates to the technical field of insulator pollution testing, in particular to an insulator artificial pollution spraying system and method. Background Art

[0002] The artificial pollution test of insulators is to evaluate their pollution resistance performance and predict the service life and operation safety of insulators by simulating the operating conditions of insulators in different pollution environments. At present, in the artificial pollution test of insulators, there are mainly two methods to artificially pollute insulators: salt spray method and solid layer method.

[0003] The salt spray method is a method of placing the insulator sample into a fog chamber filled with salt spray for artificial pollution experiments. After the insulator is cleaned and moistened, the thermal equilibrium between the insulator and the air is maintained. At this time, voltage is applied to the insulator, and the salt solution pump and air compressor are started. When the compressed air at the nozzle reaches the normal working pressure, the test is considered to have started. When using the salt spray method for experiments, there are high requirements for environmental conditions, and the type of pollution that can be achieved by this method is single, and the amount of pollution is difficult to control.

[0004] The solid layer method requires that the insulator be cleaned and dried, and then the dirty liquid is applied to the insulator using the dirty spraying method or the dirty burning method, and then the dirty layer is moistened with steam mist for testing. The test is also completed in the fog chamber. Before applying the test voltage, the steam input rate in the fog chamber should be kept at zero. After the test starts, the fog generator should be kept at a stable flow rate to discharge fog until the end of the test. Among them, preparing the solid dirty layer requires a long period of time, and the uniformity and accuracy of the applied dirty layer are limited, which may lead to uneven coverage.

[0005] In summary, the existing artificial contamination experimental methods have drawbacks and defects, facing problems such as cumbersome preparation process, low contamination efficiency and difficult to control contamination uniformity, which can easily affect the experimental efficiency and the accuracy of the experimental results. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the prior art and provide an insulator artificial pollution spraying system and method to enhance the pollution coating efficiency and improve the pollution coating uniformity.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An insulator artificial pollution spraying system, comprising:

[0009] Working air chamber, the bottom of the working air chamber is provided with an air outlet with a powder filtering area, and a liftable turntable is provided above the powder filtering area. The top of the liftable turntable is detachably connected to the bottom of the insulator, and is used to accommodate and carry out the pollution covering operation of the insulator;

[0010] Inner air duct, one end of the inner air duct is inserted into the working air chamber, and the end inserted into the working air chamber is fixedly connected with the powder spraying gun;

[0011] The control system is used to centrally control and coordinate the subsystems within the system, including receiving sensor data, calculating system parameters, automatically optimizing the operating status of each subsystem, and interacting with the user interface;

[0012] The air blast and wind speed regulating system, the air outlet of the air blast and wind speed regulating system is connected with the vacant end of the inner air duct, and is located outside the working air chamber. The air blast and wind speed regulating system includes a blower and a wind speed sensor. The wind speed sensor is used to monitor the wind speed of the blower and feed back the wind speed signal to the control system. The control system adjusts the power of the blower to control the wind speed, so as to provide compressed air for the powder spray gun;

[0013] The powder storage and powder feeding system is located outside the working air chamber, and the powder outlet is connected to the end of the inner air duct inserted into the working chamber, including a powder storage tank, a powder outlet controller, a pressure sensor, and a powder feeder. The pressure sensor is used to monitor the remaining amount of dirty powder in the powder storage tank and the powder feeder, and feed back the dirty powder remaining amount signal to the control system;

[0014] The humidity control system is located in the working air chamber and includes a humidity sensor, a humidity controller and a mist outlet. The humidity sensor is used to monitor the humidity in the working air chamber and feed back the humidity signal to the control system. The control system controls the mist outlet to discharge mist according to the humidity signal to adjust the humidity in the working air chamber.

[0015] A control panel connected to the control system is used to input the model, number of pieces, and degree of contamination of the insulators to be coated. The control system automatically sets the coating parameters based on this information and displays the estimated working time through the control panel;

[0016] The power supply system is used to provide power to each subsystem.

[0017] Preferably, the dirt covering parameters include the humidity of the working air chamber, the air outlet speed of the blower, the powder supply speed of the powder feeder, and the lifting height and rotation speed of the liftable turntable.

[0018] Preferably, in the powder storage and feeding system, pressure sensors are arranged at the bottom of the powder storage tank and the bottom of the powder feeder hopper. The pressure sensors monitor the amount of powder in the powder storage tank and the powder feeder. When the amount of powder in the powder feeder is lower than the set minimum value, the control system automatically starts the powder feeding program, and the powder is transported from the powder storage tank to the powder feeder. At the same time, the powder storage tank can monitor its own remaining powder amount. If it is lower than the set threshold, an alarm is issued to remind the user to add powder to the powder storage tank.

[0019] Preferably, the powder feeder adopts a spiral feeding form to quantitatively add the dirty powder.

[0020] Preferably, after the control panel inputs the model, number of pieces and degree of contamination of the insulator test piece to be coated, it can display the humidity of the working air chamber, the air outlet speed of the blower, the powder supply speed of the powder feeder, the height and speed of the liftable turntable and the expected working time information.

[0021] Preferably, the control system sets the gradient pollution coating of multiple insulators on the control panel, and after the pollution coating of a single insulator is completed, the control system automatically modifies the pollution coating parameters of the next insulator according to the set gradient interval.

[0022] Preferably, the estimated working time is obtained by the following formula:

[0023] T 总 =T 喷 +T 升

[0024]

[0025] Among them, T 总 is the total spraying time, T 喷 is the spraying time, T 升 is the rise time of the liftable turntable, v 升 is the rising speed of the liftable turntable, h is the height of the insulator of this model, ρ NSDD To set the equivalent ash density value of spraying, S is the single-piece surface area of ​​this type of insulator, n is the number of insulators in the insulator string; M is the powder supply speed, and α is the surface contamination coefficient of this type of insulator under a certain humidity. α is a function of relative humidity RH and insulator surface material coefficient β, and α is related to the working air chamber humidity and the insulator surface material.

[0026] Preferably, the surface contamination coefficient α is obtained by fitting experimental data using the following method:

[0027] a. Select an insulator as the test product, and measure the total mass of dirt m1 on it under the condition of relative humidity RH1 in the laboratory, powder supply speed M1, spraying time T1, then the surface pollution coefficient is

[0028]

[0029] b. Change the relative humidity to RH2, continue to test the insulator samples of the same model, and measure the α2 value;

[0030] c. Repeat the above steps to complete the measurement of α value under n relative humidity conditions;

[0031] d. Fitting the α-RH curve of the insulator based on n (α, RH) data;

[0032] e. Replace the insulator and repeat steps 1-4 to obtain the α-RH curves of different types of insulators.

[0033] Preferably, the control system automatically selects the corresponding α-RH curve according to the insulator model data input by the user, and determines the optimal relative humidity value according to the curve data, so that the surface pollution coefficient α of the insulator under such conditions can reach its maximum value to improve the pollution coating efficiency.

[0034] Another object of the present invention is to provide an insulator artificial pollution spraying method, comprising the following steps:

[0035] S1. System preparation: Check the powder quantity in the powder storage tank and powder feeder, confirm the water source of the humidity control system, check the status of the blower, and start the power system after all systems are confirmed to be correct;

[0036] S2. Information input: input the relevant parameters of the insulator through the control panel, including the insulator model and number; input the predetermined equivalent ash density value and the pollution growth gradient;

[0037] S3, automatic setting of first insulator parameters: the control system automatically sets the pollution covering parameters according to the information entered in step S2, and the control panel displays the pollution covering parameters and the estimated working time information;

[0038] S4, first insulator coating: After the first insulator to be coated is placed on the liftable turntable, the coating of the insulator begins. After the coating is completed, the coating stops and the control panel prompts "The first insulator coating is completed, please put in the next insulator";

[0039] S5. Automatic setting of subsequent insulator parameters: The control system automatically adjusts the predetermined equivalent ash density value based on the pollution growth gradient entered in step S2 while keeping other parameters unchanged, and the control panel displays the pollution coverage parameters and the expected working time information;

[0040] S6, subsequent insulator coating: After the insulator to be coated is placed on the liftable turntable, the coating is started and the insulator begins to be coated. After the coating is completed, the coating is stopped and the control panel prompts "The coating of the nth insulator, a total of m insulators, is completed. Please put in the next insulator";

[0041] S7, count judgment and loop operation: judge whether the values ​​of n and m are equal, if n≠m, repeat steps S5-S6, if n=m, proceed to the next step;

[0042] S8, system shutdown: The control panel prompts "The mth, m insulators are covered with dirt", and the powder feeder, blower, humidity control system are shut down in turn, and the system power is turned off.

[0043] The invention discloses an insulator artificial pollution spraying system having the following beneficial effects.

[0044] First, the present invention integrates sensor data through the control system. Users enter the insulator model and the predetermined equivalent gray density value information through the control panel. The system automatically sets the optimal spraying parameters and manages them, reducing the risk of human error and ensuring the uniformity and stability of the spraying process. In addition, the system can monitor the remaining amount of dirty powder in real time, and can promptly remind users to add dirty powder when the remaining amount is insufficient to avoid affecting the spraying operation.

[0045] Secondly, the present invention has built-in pollution coverage schemes for various insulator models, automatically sets equipment parameters, and realizes automated gradient pollution coverage of test insulators. The surface pollution coefficient α is obtained through experimental fitting, and combined with the expected working time calculation formula, the expected working time information can be quickly obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The schematic diagram of the structure of the artificial pollution spraying system for insulators of the present invention is shown in FIG.

[0047] Figure 2 The present invention is a flow chart of monitoring the remaining amount of dirty powder.

[0048] Figure 3 The present invention is a flow chart of the insulator artificial pollution spraying method.

[0049] Figure 4 It is a schematic diagram of an α-RH fitting curve of an insulator of the present invention.

[0050] In the attached figure: 1. working air chamber; 11. powder filtering area; 12. air outlet; 13. liftable turntable; 2. inner air duct; 21. powder spray gun; 3. control system; 4. air blast and wind speed adjustment system; 41. wind speed sensor; 5. powder storage and feeding system; 6. humidity adjustment system; 7. control panel; 8. power supply system; 9. insulator. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "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.

[0053] Example 1

[0054] Please refer to Figure 1 , an insulator 9 artificial pollution spraying system, comprising:

[0055] A working air chamber 1 is provided with an air outlet 12 with a powder filtering area 11 at the bottom of the working air chamber 1, and a liftable turntable 13 is provided above the powder filtering area 11. The top of the liftable turntable 13 is detachably connected to the bottom of the insulator 9, and is used to accommodate and carry out the contamination covering operation of the insulator 9; a positive pressure area is generated in the working air chamber 1, which can prevent external air from entering while isolating the working space from the external environment, and a powder filtering area 11 is provided at the bottom of the working air chamber 1, and a filter is also provided in front of the air outlet 12, which can effectively prevent dirty powder from spreading to the external environment to cause pollution.

[0056] The inner air duct 2 has one end inserted into the working air chamber 1 and fixedly connected to the powder spraying gun 21; the diameter of the inner air duct 2 inserted into the working air chamber 1 gradually decreases to ensure that the powder is evenly distributed in the air duct.

[0057] Control system 3, using STM32F429 embedded chip, is used to centrally control and coordinate the subsystems in the system, including receiving sensor data, calculating system parameters, automatically optimizing the operating status of each subsystem, and interacting with the user interface. The control system 3 based on the embedded chip is connected to each subsystem through a data bus;

[0058] The air blast and wind speed regulating system 4, the air outlet 12 of the air blast and wind speed regulating system 4 is connected to the vacant end of the inner air duct 2, and is located outside the working air chamber 1. The air blast and wind speed regulating system 4 includes a blower (Dongcheng Q1F-FF-32) and a wind speed sensor 41. The wind speed sensor 41 is used to monitor the wind speed of the blower and feed back the wind speed signal to the control system 3. The control system 3 adjusts the blower power to control the wind speed, so as to provide compressed air for the powder spray gun 21;

[0059] The powder storage and powder feeding system 5 is located outside the working air chamber 1, and the powder outlet is connected to the end of the inner air duct 2 inserted into the working room, including a powder storage tank, a powder discharge controller, a pressure sensor, and a powder feeder. The pressure sensor is arranged at the bottom of the powder storage tank and the bottom of the powder feeder hopper. The pressure sensor is used to monitor the remaining amount of dirty powder in the powder storage tank and the powder feeder, and feed back the dirty powder residual signal to the control system 3. The powder feeder model (Lanjiang Pump Industry WLS-260×5000-15°-N) adopts a spiral feeding form to quantitatively add dirty powder; please refer to Figure 2The powder storage and powder feeding system 5 monitors the amount of powder in the powder storage tank and the powder feeder through a pressure sensor. When the amount of powder in the powder feeder is lower than the set minimum value, the control system 3 automatically starts the powder feeding program, and the powder storage tank delivers powder to the powder feeder. At the same time, the powder storage tank can monitor the remaining amount of powder. If it is lower than the set threshold, an alarm is issued to remind the user to add powder to the powder storage tank. The powder feeder is located on the upper surface of the inner air duct 2, and the wind speed sensor 41 is located on the inner side of the inner air duct 2. In this embodiment, the minimum amount of powder in the powder feeder is 300g, and the threshold set for the powder storage tank is 1kg.

[0060] The humidity adjustment system 6 is located in the working air chamber 1 and includes a humidity sensor, a humidity controller and a mist outlet. The humidity sensor is used to monitor the humidity in the working air chamber 1 and feed back the humidity signal to the control system 3. The control system 3 controls the mist outlet to discharge mist according to the humidity signal to adjust the humidity in the working air chamber 1.

[0061] The control panel 7, model is Weilun cMT2109X touch screen, connected to the control system 3 through the data bus, and is used to input the model, number of pieces, and degree of contamination of the insulator 9 to be coated. The control system 3 automatically sets the coating parameters based on this information and displays the expected working time through the control panel 7; specifically, the coating parameters include the humidity of the working air chamber 1, the air outlet speed of the blower, the powder supply speed of the powder feeder, and the lifting height and speed of the liftable turntable 13. After the control panel 7 inputs the model, number of pieces, and degree of contamination of the insulator 9 to be coated, it can display the humidity of the working air chamber 1, the air outlet speed of the blower, the powder supply speed of the powder feeder, the height and speed of the liftable turntable 13, and the expected working time. The control system 3 sets the gradient coating of multiple insulators 9 on the control panel 7. After the coating of a single insulator 9 is completed, the control system 3 automatically modifies the next insulator 9 coating parameters according to the set gradient interval.

[0062] The power supply system 8 is used to supply power to each subsystem. As a preferred embodiment, a timer shutdown module is provided in the power supply system 8, and the working time can be set. When the set time is reached, the power supply system 8 is automatically shut down.

[0063] In this embodiment, the estimated working time consists of two parts: the spraying time and the platform rising time, wherein the spraying time is obtained by the following formula:

[0064]

[0065] Among them, T 喷 is the spraying time, ρ NSDDTo set the equivalent ash density value of spraying, S is the single-piece surface area of ​​the insulator 9 of this model, n is the number of insulators 9 in the insulator 9 string; M is the powder supply speed, α is the surface contamination coefficient of the insulator 9 of this model under a certain humidity, α is a function of the relative humidity RH and the surface material coefficient β of the insulator 9, and α is related to the humidity of the working air chamber 1 and the surface material of the insulator 9.

[0066] The surface contamination coefficient α is obtained by fitting the experimental data using the following method:

[0067] a. Select an insulator 9 as the test sample, and measure the total mass of dirt m1 on it under the condition of relative humidity RH1 in the laboratory, powder supply speed M1, spraying time T1, then the surface pollution coefficient is

[0068]

[0069] b. Change the relative humidity to RH2, continue to test 9 insulators of the same model, and measure the α2 value;

[0070] c. Repeat the above steps to complete the measurement of α value under n relative humidity conditions;

[0071] d. fitting the α-RH curve of the insulator 9 according to n (α, RH) data;

[0072] e. Replace the insulator 9 and repeat steps 1-4 to obtain the α-RH curves of different types of insulators 9.

[0073] The control system 3 automatically selects the corresponding α-RH curve according to the insulator 9 model data input by the user, and determines the optimal relative humidity value according to the curve data, so that the surface pollution coefficient α of the insulator 9 under such conditions can reach its maximum value to improve the pollution coating efficiency.

[0074] After determining the optimal relative humidity value for each type of insulator 9, in order to ensure that the artificial dirty powder blown by the blower can completely cover the surface, the blower air speed and powder supply speed of the powder supply machine are set according to the principle of "low relative humidity, low air speed and slow powder supply speed". The blower and powder supply machine of the equipment are both 5-speed adjustable, and the specific working speed is determined according to the relative humidity, as shown in Table 1 below.

[0075]

[0076]

[0077] Table 1 is used to select the air outlet speed of the blower and the powder supply speed of the powder supply machine;

[0078] The rotation speed of the liftable turntable 13 is calculated according to the following formula and is automatically set by the device:

[0079]

[0080] In addition, the liftable turntable 13 needs to be lifted during the dirt coating process to ensure that each insulator 9 in the entire insulator 9 is covered with dirt. The total lifting height H of the liftable turntable 13 is automatically calculated by the equipment based on the height h of the single insulator 9 and the number n of insulators 9, that is,

[0081] H=h·n

[0082] The height h of the single-piece insulator 9 can be determined based on the relevant data in the product manual of each type of insulator 9 and stored in the device in advance. When in use, the device can retrieve the value of the height h based on the input insulator 9 model information.

[0083] Before the coating begins, the liftable turntable 13 is lowered to the bottom, and the 9-string insulator sample is placed on the liftable turntable 13, so that the bottom insulator 9 of the 9-string insulator is kept level with the powder spraying gun 21. After the coating begins, the powder spraying gun 21 stops working after each rotation of the turntable, and the powder spraying gun 21 only sprays one insulator 9. The platform moves according to v 升 =3cm / s, then the platform stops rising, and the powder spraying gun 21 continues to work to coat the next insulator 9; the equipment repeats the above process until the coating of each insulator 9 in the entire string of insulators 9 is completed. It can be seen that the time T spent on the platform rising during the coating process is 升 for

[0084]

[0085] Therefore, the total estimated working time is obtained by adding the spraying time and the platform rising time, that is,

[0086] T 总 =T 喷 +T 升 .

[0087] Example 2

[0088] Based on Example 1, in this example, the surface pollution coefficient α of the U120BLP glass insulator 9 is measured as a test object, and the method is as follows:

[0089] a. U120BLP glass insulator 9 was selected as the test sample. When the relative humidity value RH1 = 40% was measured in the laboratory, the total mass of dirt covered on it was m1 = 0.93g, the powder supply speed was M1 = 1.5g / min, and the spraying time was T1 = 2min. At this time, the surface pollution coefficient

[0090]

[0091] Calculation shows that α1 = 0.31;

[0092] b. Changing the relative humidity to RH2 = 45% in a gradient of 5%, the test was continued on 9 samples of the same type of insulators, and the α2 value was measured to be 0.39;

[0093] c. Repeat the above steps to complete the α value measurement under 9 relative humidity conditions;

[0094] d. According to the 9 (α, RH) data, the following is fitted: Figure 4 α-RH curve of the insulator 9 shown;

[0095] The control system 3 determines that the optimal relative humidity value is 70% according to the curve data. Under this condition, the surface pollution coefficient α of the insulator 9 can reach its maximum value of 0.8 to improve the pollution coating efficiency.

[0096] Example 3

[0097] Based on Example 1 and Example 2, in this example, six strings of U120BLP glass insulators 9 are coated, each string consists of 6 insulators 9, and the pollution level of the first string of insulators 9 is set to an equivalent dust density of 1 mg / cm2, and the pollution level of each insulator 9 is increased by 5% on this basis. The control system 3 automatically sets the humidity of the working air chamber 1, the air outlet speed of the blower, the powder supply speed of the powder supply machine, and the starting height and rotation speed of the liftable turntable 13 according to the built-in U120BLP glass insulator 9 information.

[0098] At this time, the estimated working time of the first 9 strings of insulators is displayed. The estimated working time of the first 9 strings of insulators is calculated by the following formula:

[0099] T 总 =T 喷 +T 升

[0100] Among them, T 总 is the estimated working time, which is determined by the spraying time T 喷 and platform rise time T 升 Add them together. Among them, the spraying time T 喷 It is derived from the following formula:

[0101]

[0102] where ρ NSDD To set the equivalent gray density of spraying to 1mg / cm 2 , S is the single-piece surface area of ​​the insulator 9 of this model 900cm 2, n is the number of insulator strings 9 6; M is the powder supply speed 2.5g / min, α is the optimal surface contamination coefficient of this type of insulator 9 0.8, and the relative humidity of the working air chamber 1 is the optimal relative humidity value of this type of insulator 9 70%. Calculate T 喷 =2.7min.

[0103] The equipment sets the speed of the lifting table 13 according to the following formula:

[0104]

[0105] Calculation shows ω=2.22r / min.

[0106] Platform rise time T 升 for

[0107]

[0108] Where h is the height of the single-piece insulator 9, 10 cm, and the platform rise speed v 升 =3cm / s, calculate the platform rising time T 升 =16.67s.

[0109] Therefore, the estimated working time of the first insulator string 9 is T 总 =2.98min.

[0110] Afterwards, the remaining five insulator strings will display their estimated working time before spraying, and the calculation formula is the same as above. However, it should be noted that due to the ρ NSDD The value increases by 5% successively, so the spraying time of each insulator string is T 喷 It will also increase by 5%.

[0111] Example 4

[0112] Please refer to Figure 3 , an insulator 9 artificial pollution spraying method, comprising the following steps:

[0113] S1. System preparation: Check the powder quantity in the powder storage tank and powder feeder, confirm the water source of the humidity control system 6, check the blower status, and after all systems are confirmed to be correct, start the power system 8; check the dirty powder quantity in the powder storage tank and powder feeder, if insufficient, replenish it according to the pollution coverage requirements and pollution type; check the water source of the humidity control system 6 to ensure sufficient water for humidity control.

[0114] S2, information input: input the relevant parameters of the insulator 9 through the control panel 7, including the model and number of the insulator 9; input the predetermined equivalent ash density value and the pollution growth gradient;

[0115] S3, automatic setting of parameters of the first insulator 9: the control system 3 automatically sets the pollution covering parameters according to the information entered in step S2, and the control panel 7 displays the pollution covering parameters and the estimated working time information;

[0116] S4, first insulator 9 coating: After the first insulator 9 to be coated is placed on the liftable turntable 13, humidity is adjusted and the humidity sensor monitors the humidity in real time. If it is lower than the set value, the control system 3 starts the mist outlet to spray atomization until the target humidity is reached, and the insulator 9 begins to be coated. After the coating is completed, the coating is stopped, and the control panel 7 prompts "The first insulator 9 is coated, please put in the next insulator 9";

[0117] S5, automatic setting of subsequent insulator 9 parameters: the control system 3 automatically adjusts the predetermined equivalent gray density value based on the pollution growth gradient entered in step S2 while keeping other parameters unchanged, and the control panel 7 displays the pollution coverage parameters and the expected working time information;

[0118] S6, subsequent insulator 9 coating: After the insulator 9 to be coated is placed on the liftable turntable 13, the coating is started, and the insulator 9 begins to be coated. After the coating is completed, the coating is stopped, and the control panel 7 prompts "The coating of the nth insulator 9, a total of m insulators 9, is completed. Please put in the next insulator 9";

[0119] S7, count judgment and loop operation: judge whether the values ​​of n and m are equal, if n≠m, repeat steps S5-S6, if n=m, proceed to the next step;

[0120] S8, system shutdown: the control panel 7 prompts "mth, m insulators 9 are covered with dirt", and the powder feeder, blower, humidity control system 6 are shut down in sequence and the system power is turned off. The unattached dirt powder is recovered, and the filter set at the air outlet 12 intercepts the remaining powder into the air outlet 12 for centralized collection.

[0121] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be a substitution of a part of the structure, device, method step, or a complete technical solution. The equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. An insulator artificial pollution spraying system, characterized in that: include: Working air chamber, the bottom of the working air chamber is provided with an air outlet with a powder filtering area, and a liftable turntable is provided above the powder filtering area. The top of the liftable turntable is detachably connected to the bottom of the insulator, and is used to accommodate and carry out the pollution covering operation of the insulator; Inner air duct, one end of the inner air duct is inserted into the working air chamber, and the end inserted into the working air chamber is fixedly connected with the powder spraying gun; The control system is used to centrally control and coordinate the subsystems within the system, including receiving sensor data, calculating system parameters, automatically optimizing the operating status of each subsystem, and interacting with the user interface; The air blast and wind speed regulating system, the air outlet of the air blast and wind speed regulating system is connected with the vacant end of the inner air duct, and is located outside the working air chamber. The air blast and wind speed regulating system includes a blower and a wind speed sensor. The wind speed sensor is used to monitor the wind speed of the blower and feed back the wind speed signal to the control system. The control system adjusts the power of the blower to control the wind speed, so as to provide compressed air for the powder spray gun; The powder storage and powder feeding system is located outside the working air chamber, and the powder outlet is connected to the end of the inner air duct inserted into the working chamber, including a powder storage tank, a powder outlet controller, a pressure sensor, and a powder feeder. The pressure sensor is used to monitor the remaining amount of dirty powder in the powder storage tank and the powder feeder, and feed back the dirty powder remaining amount signal to the control system; The humidity control system is located in the working air chamber and includes a humidity sensor, a humidity controller and a mist outlet. The humidity sensor is used to monitor the humidity in the working air chamber and feed back the humidity signal to the control system. The control system controls the mist outlet to discharge mist according to the humidity signal to adjust the humidity in the working air chamber. A control panel connected to the control system is used to input the model, number of pieces, and degree of contamination of the insulators to be coated. The control system automatically sets the coating parameters based on this information and displays the estimated working time through the control panel; The power supply system is used to provide power to each subsystem.

2. The insulator artificial pollution spraying system according to claim 1, characterized in that: The dirt covering parameters include the humidity of the working air chamber, the air outlet speed of the blower, the powder supply speed of the powder feeder, and the lifting height and rotation speed of the liftable turntable.

3. The insulator artificial pollution spraying system according to claim 1, characterized in that: The powder storage and powder feeding system has pressure sensors disposed at the bottom of the powder storage tank and the bottom of the powder feeder hopper. The pressure sensors are used to monitor the amount of powder in the powder storage tank and the powder feeder. When the amount of powder in the powder feeder is lower than a set minimum value, the control system automatically starts the powder feeding program, and the powder storage tank delivers powder to the powder feeder. At the same time, the powder storage tank can monitor its own remaining powder amount. If it is lower than a set threshold, an alarm is sounded to remind the user to add powder to the powder storage tank.

4. The insulator artificial pollution spraying system according to claim 3, characterized in that: The powder feeder adopts a spiral feeding form to quantitatively add dirty powder.

5. The insulator artificial pollution spraying system according to claim 1, characterized in that: After the control panel inputs the model, number of pieces and degree of contamination of the insulator sample to be coated, it can display the humidity of the working air chamber, the air outlet speed of the blower, the powder supply speed of the powder feeder, the height and speed of the liftable turntable and the estimated working time information.

6. The insulator artificial pollution spraying system according to claim 1, characterized in that: The control system sets the gradient pollution coverage of multiple insulators on the control panel. After the pollution coverage of a single insulator is completed, the control system automatically modifies the pollution coverage parameters of the next insulator according to the set gradient interval.

7. The insulator artificial pollution spraying system according to claim 1, characterized in that: The estimated working hours are derived from the following formula: T 总 =T 喷 +T 升 Among them, T 总 is the total spraying time, T 喷 is the spraying time, T 升 is the rise time of the liftable turntable, v 升 is the rising speed of the liftable turntable, h is the height of the insulator of this model, ρ NSDD To set the equivalent ash density value of spraying, S is the single-piece surface area of ​​this type of insulator, n is the number of insulators in the insulator string; M is the powder supply speed, and α is the surface contamination coefficient of this type of insulator under a certain humidity. α is a function of relative humidity RH and insulator surface material coefficient β, and α is related to the working air chamber humidity and the insulator surface material.

8. The insulator artificial pollution spraying system according to claim 7, characterized in that: The surface contamination coefficient α is obtained by fitting experimental data, and the method is: a. Select an insulator as the test product, and measure the total mass of dirt m1 on it under the condition of relative humidity RH1 in the laboratory, powder supply speed M1, spraying time T1, then the surface pollution coefficient is b. Change the relative humidity to RH2, continue to test the insulator samples of the same model, and measure the α2 value; c. Repeat the above steps to complete the measurement of α value under n relative humidity conditions; d. Fitting the α-RH curve of the insulator based on n (α, RH) data; e. Replace the insulator and repeat steps 1-4 to obtain the α-RH curves of different types of insulators.

9. The insulator artificial pollution spraying system according to claim 1, characterized in that: The control system automatically selects the corresponding α-RH curve according to the insulator model data input by the user, and determines the optimal relative humidity value according to the curve data, so that the surface pollution coefficient α of the insulator under such conditions can reach its maximum value to improve the pollution coating efficiency.

10. A spraying method for an insulator artificial pollution spraying system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. System preparation: Check the powder quantity in the powder storage tank and powder feeder, confirm the water source of the humidity control system, check the status of the blower, and start the power system after all systems are confirmed to be correct; S2. Information input: input the relevant parameters of the insulator through the control panel, including the insulator model and number; input the predetermined equivalent ash density value and the pollution growth gradient; S3, automatic setting of first insulator parameters: the control system automatically sets the pollution covering parameters according to the information entered in step S2, and the control panel displays the pollution covering parameters and the estimated working time information; S4, first insulator coating: After the first insulator to be coated is placed on the liftable turntable, the coating of the insulator begins. After the coating is completed, the coating stops and the control panel prompts "The first insulator coating is completed, please put in the next insulator"; S5. Automatic setting of subsequent insulator parameters: The control system automatically adjusts the predetermined equivalent ash density value based on the pollution growth gradient entered in step S2 while keeping other parameters unchanged, and the control panel displays the pollution coverage parameters and the expected working time information; S6, subsequent insulator coating: After the insulator to be coated is placed on the liftable turntable, the coating is started and the insulator coating begins. After the coating is completed, the coating is stopped and the control panel prompts "Nth insulator, a total of m insulators, the coating is completed, please put in the next insulator"; S7, count judgment and loop operation: judge whether the values ​​of n and m are equal, if n≠m, repeat steps S5-S6, if n=m, proceed to the next step; S8, system shutdown: The control panel prompts "The mth insulator, a total of m insulators, are covered with dirt", and the powder feeder, blower, humidity control system are shut down in sequence, and the system power is turned off.

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