A method, system, and medium for powder coating an elongated tube surface

Abstract

The application relates to the technical field of intelligent production control, and particularly relates to a powder spraying method, a system and a medium for the surface of an elongated pipe, the method comprising the following steps: placing a pretreated elongated pipe on a workbench containing multiple components, performing electrostatic spraying by using a spray gun, adjusting powder feeding, dynamically adjusting a flow channel angle according to a parameter combination, and combining speed induction to control spraying uniformity. The technical problems that a dynamic parameter matching mechanism for different pipe diameters and wall thicknesses is lacked, airflow changes in the internal space of the elongated pipe are difficult to deal with, and powder is prone to uneven distribution in the pipe are solved, technical effects that the coating thickness deviation is controlled, the spiral angle of the flow channel is dynamically adjusted according to the friction torque, the speed fluctuation is detected in real time by using a piezoelectric centrifugal switch, the powder distribution in the pipe is automatically triggered by triggering the spray gun displacement compensation and the powder feeding amount adjustment, and the processing efficiency is improved on the basis of ensuring the powder spraying quality of the surface of the elongated pipe are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent production control, and particularly relates to a powder spraying method, a system and a medium for the surface of an elongated pipe. BACKGROUND

[0002] Powder spraying is widely used in the fields of automobile parts, building pipes, mechanical manufacturing, etc., and is particularly suitable for the surface protection and decoration of elongated pipe products. With the increasing requirements of the manufacturing industry on product quality and production efficiency, the powder spraying on the surface of the elongated pipe needs to achieve the goals of high coating uniformity, strong adhesion and stable production process, so as to meet the diversified market demand.

[0003] In the spraying process control, the conventional method is difficult to accurately adjust the relative position of the spray gun and the pipe, the strength of the electrostatic field and the powder feeding amount, etc., resulting in uneven coating thickness, surface sagging or particle accumulation and other defects; in terms of equipment adaptability, the fixed spraying structure cannot flexibly adjust the process according to the differences in pipe diameter, wall thickness, etc., and the production efficiency is low.

[0004] In summary, the prior art lacks a dynamic parameter matching mechanism for different pipe diameters and wall thicknesses, and it is difficult to cope with the airflow changes in the internal space of the elongated pipe, which easily causes uneven distribution of powder in the pipe. SUMMARY

[0005] The present application provides a powder spraying method, a system and a medium for the surface of an elongated pipe, which aims to solve the technical problems in the prior art that lack a dynamic parameter matching mechanism for different pipe diameters and wall thicknesses, and it is difficult to cope with the airflow changes in the internal space of the elongated pipe, which easily causes uneven distribution of powder in the pipe.

[0006] In view of the above problems, the technical scheme of the present application is as follows:

[0007] In the first aspect of the present application, a powder spraying method for the surface of an elongated pipe is provided, wherein the method comprises: arranging the elongated pipe after surface pretreatment on a powder spraying workbench, the powder spraying workbench being provided with a powder feeding mechanism, a spray gun mechanism, a pipe fixing assembly and a pipe rotating assembly; the spray gun mechanism sprays powder coating to the surface of the elongated pipe under the action of an electrostatic field, and a first operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly is determined; the powder feeding mechanism adjusts the powder feeding pressure according to a preset powder feeding amount, so that the powder coating is conveyed in a powder feeding pipeline and enters the spray gun mechanism, and a second operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly is determined, and the powder feeding mechanism comprises a double powder feeding channel; based on the spray gun mechanism and the first operation parameter combination, the powder feeding mechanism and the second operation parameter combination, the anti-adhesion flow guide structure integrated in the pipe rotating assembly is used to dynamically adjust the spiral angle of the flow guide groove; at the same time, the spraying uniformity is adaptively controlled in combination with the rotation speed sensing characteristics and real-time triggering mechanism of a piezoelectric centrifugal switch.

[0008] Preferably, the spray gun moving speed is adjusted according to the distance between the spray gun and the surface of the elongated pipe; the spray gun angle is set according to the correlation index of the spray gun angle and the uniformity of the coating thickness; a mapping relationship table of the pipe diameter of the elongated pipe and the electrostatic voltage is established, and the first operation parameter combination is obtained by integrating the spray gun moving speed, the spray gun angle and the electrostatic voltage determined by using the mapping relationship table.

[0009] Preferably, a high-voltage electrostatic generator is configured, and the device technical parameters of the high-voltage electrostatic generator include an output voltage range and an output current range; the electrode spacing is dynamically adjusted according to the surface roughness of the pipe, the multi-electrode electrostatic field strength distribution is optimized, and the output voltage value and the output current value corresponding to the device technical parameters are fine-tuned in combination with the temperature and humidity of the spraying environment.

[0010] Preferably, the primary powder feeding channel in the double powder feeding channel uses a screw pump to control powder flow parameters, and the powder flow parameters include an output flow range and a powder particle size; the secondary powder feeding channel in the double powder feeding channel integrates an ultrasonic atomization device, and the ultrasonic atomization parameters include an atomization frequency range and an atomized particle size; wherein, the powder feeding proportion of the primary powder feeding channel and the secondary powder feeding channel is dynamically adjusted according to the outer diameter of the pipe and the pipe wall thickness, and a differential powder feeding strategy is set.

[0011] Preferably, the pipe rotating assembly comprises a servo motor driving unit; when it is detected that the friction torque between the flow guide groove and the pipe wall exceeds a torque threshold value, an angle fine-tuning instruction is triggered; after receiving the angle fine-tuning instruction, the servo motor driving unit adjusts the pipe rotating angle to change the contact state between the flow guide groove and the pipe wall.

[0012] Preferably, the anti-adhesion flow guide structure is provided with a flow guide groove surface treatment to determine the friction coefficient; a dust collection cavity is arranged at the bottom of the flow guide groove; and a negative pressure suction unit is arranged in the dust collection cavity to remove the stripping powder in real time.

[0013] Preferably, the coating thickness is detected in real time; when the detected thickness deviation exceeds a thickness deviation threshold, a transverse displacement compensation of the spray gun is triggered; and at the same time, the powder feeding pressure and the powder feeding amount of the powder feeding mechanism and the electrostatic voltage and the spray gun moving speed of the spray gun mechanism are cooperatively adjusted in combination with the rotation speed information of the pipe rotating element fed back in real time by the piezoelectric centrifugal switch.

[0014] Preferably, a plurality of piezoelectric ceramic pieces are arranged along the flow guide groove to form a piezoelectric sensor array; when the detected centrifugal acceleration exceeds a preset acceleration threshold, a flow guide groove self-cleaning mode is triggered; in the pipe starting and stopping stage, real-time centrifugal force sensing and response are performed in the flow guide groove self-cleaning mode; high-frequency vibration is generated by applying a driving voltage signal to the M groups of piezoelectric ceramic pieces; and the high-frequency vibration is transmitted to the surface of the flow guide groove.

[0015] In the second aspect of the present application, a powder spraying system for the surface of an elongated pipe is provided, wherein the system comprises: a surface pretreatment module, which is used to arrange the elongated pipe after surface pretreatment on a powder spraying workbench, and the powder spraying workbench is provided with a powder feeding mechanism, a spray gun mechanism, a pipe fixing assembly and a pipe rotating assembly; a first operation parameter combination determination module, which is used to determine a first operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly, by spraying the powder coating towards the surface of the elongated pipe under the action of an electrostatic field by the spray gun mechanism; a second operation parameter combination determination module, which is used to determine a second operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly, by adjusting the powder feeding pressure of the powder feeding mechanism to convey the powder coating in the powder feeding pipeline and into the spray gun mechanism according to a preset powder feeding amount, and the powder feeding mechanism comprises a double powder feeding channel; a dynamic adjustment module, which is used to dynamically adjust the spiral angle of the flow guide groove by the anti-adhesion flow guide structure integrated in the pipe rotating assembly, based on the spray gun mechanism, the first operation parameter combination, the powder feeding mechanism and the second operation parameter combination; and an adaptive control module, which is used to simultaneously perform spraying uniformity adaptive control in combination with the rotation speed sensing property and the real-time triggering mechanism of the piezoelectric centrifugal switch.

[0016] In the third aspect of the present application, the present application further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps in the above-mentioned powder spraying method for the surface of an elongated pipe when executing the computer program.

[0017] In summary, the one or more technical solutions provided in the present application realize the technical effects of controlling the coating thickness deviation by associating the spray gun mechanism with the pipe rotating assembly, dynamically adjusting the spiral angle of the flow guide groove according to the friction torque, and using a piezoelectric centrifugal switch to detect the speed fluctuation in real time, automatically triggering the spray gun displacement compensation and the powder feeding amount adjustment to make the powder distribute in the pipe, ensuring the powder spraying quality on the surface of the slender pipe, and improving the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A flowchart of a powder spraying method on the surface of a slender pipe is provided for the present application.

[0019] Figure 2 A structural diagram of a powder spraying system on the surface of a slender pipe is provided for the present application.

[0020] Figure 3 A structural diagram of an electronic device is provided for the embodiment of the present application.

[0021] Explanation of reference signs: surface pretreatment module M100, first operation parameter combination determination module M200, second operation parameter combination determination module M300, dynamic adjustment module M400, adaptive control module M500, bus 300, receiver 301, processor 302, transmitter 303, memory 304, bus interface 305. DETAILED DESCRIPTION

[0022] Embodiment one, the present application will be specifically described below in combination with the drawings, as shown in the drawings, the present application provides a powder spraying method on the surface of a slender pipe, wherein the method comprises: Figure 1

[0023] S1: setting the slender pipe after surface pretreatment on the powder spraying workbench, the powder spraying workbench is provided with a powder feeding mechanism, a spray gun mechanism, a pipe fixing assembly and a pipe rotating assembly; S2: the spray gun mechanism sprays the powder coating to the surface of the slender pipe under the action of the electrostatic field, and determines the first operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly; S3: the powder feeding mechanism adjusts the powder feeding pressure according to the preset powder feeding amount to convey the powder coating in the powder feeding pipeline and enter the spray gun mechanism, and determines the second operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly, the powder feeding mechanism comprises a double powder feeding channel.

[0024] ​Specifically, the surface pretreatment refers to sandblasting and plasma cleaning of the elongated pipe to improve the adhesion of the powder; the powder spraying workstation is a platform that carries and integrates the powder feeding, spray gun, fixing and rotating components; the powder feeding mechanism includes double channels, responsible for delivering the powder coating to the spray gun according to the set amount and pressure; the spray gun mechanism charges the powder with electricity through the electrostatic field and adsorbs it to the pipe surface; the pipe fixing component is used to stabilize the elongated pipe to prevent displacement; the pipe rotating component drives the elongated pipe to rotate to ensure uniform spraying; determining the first and second operating parameter combinations refers to associating the spray gun and powder feeding parameters according to the pipe fixing and rotating states, such as the synchronization coefficient of the spray gun moving speed and the pipe rotating speed, the adaptation value of the powder feeding pressure and the pipe diameter, etc.

[0025] In a feasible implementation, first, the elongated pipe pretreated by sandblasting and plasma cleaning is accurately placed on the powder spraying workstation and clamped with the pipe fixing component, and the rotating component is started to make the pipe rotate at a uniform speed. At this time, the spray gun mechanism moves at a certain speed and adjusts the spraying angle under the action of the electrostatic field (voltage 40-60 kV) according to the pipe diameter and rotating speed, to ensure uniform adhesion of the powder. For example, in the double channels of the powder feeding mechanism, the primary channel delivers the powder at a flow rate of 100-300 g / min through a screw pump, and the secondary channel atomizes the powder into 10-30 μm particles at a frequency of 20-40 kHz through an ultrasonic device. The powder feeding ratio of the two channels is dynamically adjusted according to the pipe wall thickness (for example, when the wall thickness is 2 mm, the primary channel accounts for 60% and the secondary channel accounts for 40%), so that the powder is stably delivered and finely atomized.

[0026] S4: dynamically adjusting the spiral angle of the anti-adhesion flow guide groove based on the spray gun mechanism and the first operating parameter combination, the powder feeding mechanism and the second operating parameter combination, with the anti-adhesion flow guide structure integrated in the pipe rotating component; S5: at the same time, combining the rotating speed sensing characteristics and real-time triggering mechanism of the piezoelectric centrifugal switch to perform self-adaptive control of spraying uniformity.

[0027] Specifically, the anti-adhesion flow guide structure refers to a special structure integrated inside the pipe rotating component, the surface of which is treated to reduce the adhesion of the powder coating, and the flow direction of the powder is guided through the flow guide groove; dynamically adjusting the spiral angle of the flow guide groove refers to adjusting the spiral angle of the flow guide groove in real time according to the change of the friction torque during the rotation of the pipe, to optimize the powder flow path; the piezoelectric centrifugal switch is a device that utilizes the rotating speed sensing characteristics and high-frequency vibration function of piezoelectric ceramics, which can detect the rotating speed of the pipe in real time and trigger corresponding actions; self-adaptive control of spraying uniformity refers to automatically adjusting the parameters such as spray gun displacement, powder feeding amount, and electrostatic voltage based on the speed information and coating thickness detection data fed back by the piezoelectric centrifugal switch, to ensure uniform coating thickness.

[0028] In a feasible embodiment, during spraying, the spray gun mechanism works according to a first combination of operating parameters (e.g. spray gun moving speed 0.8-1.2 m / s, spray gun angle 45-75°, electrostatic voltage 40-60 kV) and the powder feeding mechanism works according to a second combination of operating parameters (e.g. primary channel powder feeding amount 100-300 g / min, secondary channel atomization frequency 20-40 kHz). At this time, the anti-adhesion flow guide structure in the pipe rotating assembly dynamically adjusts the spiral angle of the flow guide groove (adjustment range 10°-30°) according to the friction torque (when the torque exceeds 0.5 N·m), optimizes the powder flow path in the pipe, and makes the powder distribution more uniform. At the same time, the piezoelectric centrifugal switch detects the pipe rotating speed in real time, and when it detects that the coating thickness deviation exceeds ±10 μm, triggers the spray gun transverse displacement compensation (displacement accuracy ±0.1 mm), and adjusts the powder feeding pressure (fluctuation range ±0.02 MPa) and powder feeding amount (fluctuation range ±5 g / min), as well as the spray gun electrostatic voltage (fluctuation range ±1 kV) and moving speed (fluctuation range ±0.02 m / s) in combination with the rotating speed information. This process forms a cross-physical field synergistic regulation architecture, which reduces the coating thickness standard deviation and powder residue rate through the coupling of mechanical field (pipe rotating), flow field (powder feeding), electrostatic field (spray gun) and vibration field (piezoelectric self-cleaning), and significantly improves the spraying quality and production efficiency.

[0029] Further, the spray gun mechanism sprays the powder coating towards the surface of the elongated pipe under the action of the electrostatic field, determines a first combination of operating parameters associated with the pipe fixing assembly and the pipe rotating assembly, and the method comprises:

[0030] According to the distance between the spray gun and the surface of the elongated pipe, the moving speed of the spray gun is adjusted; according to the correlation index of the spray gun angle and the uniformity of the coating thickness, the spray gun angle is set according to the length of the elongated pipe; a mapping relationship table of the pipe diameter of the elongated pipe and the electrostatic voltage is established, and the first combination of operating parameters is obtained by integrating the moving speed of the spray gun, the spray gun angle and the electrostatic voltage determined by using the mapping relationship table.

[0031] Specifically, the distance between the spray gun and the surface of the elongated pipe refers to the vertical height from the nozzle of the spray gun to the surface of the elongated pipe, which directly affects the deposition efficiency and coating thickness of the powder coating; the spray gun moving speed is the speed of the spray gun moving along the axial direction of the elongated pipe, which, together with the powder spraying amount of the spray gun and the rotation speed of the elongated pipe, determines the uniformity of the coating; the spray gun angle refers to the included angle between the nozzle of the spray gun and the normal line of the surface of the elongated pipe, which affects the impact speed and diffusion range of the powder particles, and further affects the thickness distribution of the coating; the correlation index of the uniformity of the coating thickness is a quantitative index for describing the sensitivity of the change of the spray gun angle to the uniformity of the coating thickness; and the mapping relationship table of the pipe diameter of the elongated pipe and the electrostatic voltage is established based on a large amount of experimental data, and is used to guide the selection of a proper electrostatic voltage under different pipe diameters, so as to ensure the adsorption effect of the powder on the surface of the elongated pipe.

[0032] In a feasible implementation, first, the moving speed of the spray gun is adjusted according to the distance between the spray gun and the surface of the elongated pipe, and generally, the distance between the spray gun and the surface of the elongated pipe is controlled within the range of 100-200 mm. When the distance is 150 mm, the moving speed of the spray gun is preferably set to be 0.5 m / s-1.5 m / s. For example, for an elongated pipe with a length of 2 m, the spray gun is moved at a speed of 1 m / s, which can ensure that the uniformity of the coating thickness is within ±5%. Then, according to the correlation index of the spray gun angle and the uniformity of the coating thickness, the spray gun angle is set by referring to the length of the elongated pipe. If the correlation index is 0.8, for an elongated pipe with a length of 3 m, the spray gun angle can be set to be 60°, so that the standard deviation of the coating thickness is reduced to 3 μm. Finally, the mapping relationship table of the pipe diameter of the elongated pipe and the electrostatic voltage is established. After the spray gun moving speed, the spray gun angle and the electrostatic voltage are integrated, the first operation parameter combination is obtained. Through the precise adjustment of the operation parameters of the spray gun, the uniform deposition of the powder coating on the surface of the elongated pipe is ensured, which provides a key process guarantee for the subsequent high-quality powder spraying.

[0033] Further, the spray gun mechanism comprises an electrostatic field generator, and the method comprises:

[0034] A high-voltage electrostatic generator is configured, and the technical parameters of the high-voltage electrostatic generator include an output voltage range and an output current range; the electrode spacing is dynamically adjusted according to the surface roughness of the pipe, the electrostatic field strength distribution is optimized, and the output voltage value and the output current value corresponding to the technical parameters of the device are fine-tuned in combination with the temperature and humidity of the spraying environment.

[0035] Specifically, the high-voltage electrostatic generator is a device for generating a high-voltage electrostatic field, and the output voltage range and the output current range are key parameters determining the strength of the electrostatic field and the powder adhesion effect; the surface roughness of the pipe is an important factor affecting the adhesion of the powder coating, and the distribution of the electrostatic field can be changed by adjusting the electrode spacing, thereby affecting the adsorption efficiency of the powder; the multi-pole electrostatic field strength distribution refers to the change of the strength of the electrostatic field at different positions, and optimizing this distribution helps to improve the uniformity of the adsorption of the powder on the surface of the slender pipe; the temperature and humidity of the spraying environment have a significant impact on the stability of the electrostatic field and the flowability of the powder, and fine-tuning the technical parameters of the equipment can compensate for fluctuations caused by environmental factors.

[0036] In a feasible implementation, when configuring the high-voltage electrostatic generator, first set its output voltage range to 30-70kV and output current range to 0-300μA to meet the needs of different slender pipe spraying. For example, when the surface roughness of the pipe is Ra1.5-3.0μm, the multi-pole electrostatic field strength distribution is optimized by dynamically adjusting the electrode spacing between 5-15mm, reducing the standard deviation of the electrostatic field strength to 8%, and at the same time, according to the temperature and humidity of the spraying environment (temperature 20-25°C, humidity 40-60%), fine-tune the output voltage value and output current value. By integrating the parameters such as the moving speed of the spray gun, the angle of the spray gun, and the electrostatic voltage, the first operation parameter combination is obtained, so as to ensure the adsorption effect of the powder on the surface of the slender pipe and the quality of the coating, realize the precise control of the electrostatic spraying parameters, and effectively improve the adhesion and uniformity of the coating.

[0037] Further, the powder feeding mechanism includes a double powder feeding channel, and the method includes:

[0038] The primary powder feeding channel in the double powder feeding channel uses a screw pump to control the powder flow parameters, including the output flow range and the powder particle size; the secondary powder feeding channel in the double powder feeding channel integrates an ultrasonic atomization device, and the ultrasonic atomization parameters include the atomization frequency range and the atomized particle size; wherein, according to the outer diameter of the pipe and the pipe wall thickness, the powder feeding ratio of the primary powder feeding channel and the secondary powder feeding channel is dynamically adjusted, and a differentiated powder feeding strategy is set.

[0039] Specifically, the primary powder feeding channel uses a screw pump to control the powder flow parameters. The primary powder feeding channel is part of the dual powder feeding channel and is mainly responsible for delivering the powder coating to the spray gun mechanism at a certain flow rate. The screw pump precisely controls the output flow of the powder by its rotation speed. The output flow range refers to the interval of powder flow that the screw pump can provide, usually measured in grams per minute (g / min). The powder particle size refers to the size of the powder particles, which affects the roughness and adhesion of the coating. The secondary powder feeding channel integrates an ultrasonic atomization device. The secondary powder feeding channel focuses on further refining and atomizing the powder to improve its flowability and uniformity. The ultrasonic atomization parameters include the atomization frequency range and the atomized particle size. The atomization frequency determines the degree of powder atomization, and the higher the frequency, the better the atomization effect. The atomized particle size affects the fineness of the coating.

[0040] In a feasible implementation, during operation, the screw pump of the primary powder feeding channel delivers the powder coating at a stable flow rate (generally adjustable between 50-300 g / min) according to the system's set parameters. For example, for large-diameter and thick-walled pipe fittings, the flow rate can be adjusted to a higher value of 200-300 g / min. At the same time, the ultrasonic atomization device in the secondary powder feeding channel atomizes at a certain frequency (usually between 20-50 kHz) to refine the powder particles to a suitable particle size (such as 10-40 μm). The system dynamically adjusts the powder feeding ratio of the two channels according to the pipe's outer diameter and wall thickness. For example, when the pipe has a large outer diameter and thick wall, the primary powder feeding channel's powder feeding ratio can be adjusted to 60%-70%, and the secondary powder feeding channel's ratio can be reduced to 30%-40% to ensure sufficient powder supply and good atomization effect. For small-diameter and thin-walled pipe fittings, the primary channel's powder feeding ratio can be reduced to 40%-50%, and the secondary channel's ratio can be increased to 50%-60% to avoid excessive powder accumulation. Using differentiated powder feeding strategies can ensure uniform distribution and effective adhesion of the powder on different pipe fittings and improve the quality of the coating.

[0041] Further, the method of the present application also includes:

[0042] The pipe rotating assembly includes a servo motor driving unit. When the friction torque between the guide groove and the pipe wall is detected to exceed the torque threshold value, an angle fine-tuning instruction is triggered. After receiving the angle fine-tuning instruction, the servo motor driving unit adjusts the rotation angle of the pipe to change the contact state between the guide groove and the pipe wall.

[0043] Specifically, the pipe rotating assembly includes a servo motor drive unit, which is a high-precision and high-response motor control system that can accurately adjust the rotation angle and speed of the pipe according to the control signal; the friction torque between the guide groove and the pipe wall refers to the friction torque generated between the guide groove and the pipe wall due to contact and relative motion during the rotation of the pipe; the torque threshold is a pre-set torque threshold, and when the friction torque exceeds this value, the system will determine that adjustment is needed; the angle fine-tuning instruction is a control signal used to instruct the servo motor drive unit to make a small adjustment to the rotation angle of the pipe to change the contact state between the guide groove and the pipe wall.

[0044] In a feasible implementation, when the pipe is rotating on the rotating assembly, the system monitors the friction torque between the guide groove and the pipe wall in real time. Once it detects that the friction torque exceeds the set torque threshold (for example, when the torque reaches 0.3 N·m), the system will automatically generate an angle fine-tuning instruction. After the servo motor drive unit receives the instruction, it will accurately adjust the rotation angle of the pipe, usually within ±5°, to change the contact state between the guide groove and the pipe wall, thereby reducing the friction torque, making the contact pressure between the guide groove and the pipe wall evenly distributed, reducing the friction torque, effectively preventing excessive wear between the guide groove and the pipe wall, reducing the residue of powder in the guide groove, improving the efficiency of powder delivery and the uniformity of the coating, and ensuring the stability and quality of the entire spraying process.

[0045] Further, the dynamic adjustment of the helix angle of the guide groove in the pipe rotating assembly with the anti-adhesion guide structure integrated therein includes:

[0046] The anti-adhesion guide structure is subjected to guide groove surface treatment to determine the friction coefficient; a dust collection cavity is provided at the bottom of the guide groove; and a negative pressure suction unit is provided in the dust collection cavity to remove the stripped powder in real time.

[0047] Specifically, the anti-adhesion guide structure is subjected to guide groove surface treatment, which means that the surface of the guide groove is processed by a specific physical or chemical method to reduce the adhesion of powder coating on its surface; the friction coefficient is a physical quantity that measures the friction force between the surface of the guide groove and the powder particles, and the smaller the value, the smoother the flow of the powder; the dust collection cavity is a closed space provided at the bottom of the guide groove for collecting the stripped or unabsorbed powder during the spraying process; and the negative pressure suction unit is a device that generates suction force by utilizing the pressure difference, which can continuously extract and collect the powder particles in the dust collection cavity, ensuring the cleanliness of the spraying environment and the efficient use of the powder.

[0048] In a feasible implementation, the surface of the flow guide groove of the anti-adhesion flow guide structure is treated before the start of the spraying operation, for example, sandblasting is used to make the surface roughness of the flow guide groove reach Ra 0.5-1.0 μm, and then a Teflon coating is applied to reduce the friction coefficient of the surface of the flow guide groove, thereby effectively reducing the adhesion of the powder in the flow guide groove. During the spraying process, under the combined action of the electrostatic field and the airflow, part of the powder that is not adsorbed on the surface of the slender tube will flow to the bottom of the flow guide groove along with the airflow, and enter the dust collection chamber. The negative pressure suction unit in the dust collection chamber continuously sucks the powder particles in the dust collection chamber out at a pressure of-0.5--1.0 kPa, and transports them to the powder recycling system through the pipeline for reuse. For example, in the case of spraying 500 g of powder per hour, the dust collection chamber can collect more than 85% of the unadsorbed powder, and the negative pressure suction unit will transport all of these powders to the recycling system, not only reducing the residual powder in the flow guide groove, but also improving the utilization rate of the powder.

[0049] Further, in combination with the rotation speed sensing characteristics and real-time triggering mechanism of the piezoelectric centrifugal switch, the present application method includes:

[0050] Real-time detection of coating thickness; when the detected thickness deviation exceeds the thickness deviation threshold, trigger the lateral displacement compensation of the spray gun; at the same time, in combination with the rotation speed information of the pipe provided by the real-time feedback of the piezoelectric centrifugal switch, cooperatively adjust the powder feeding pressure and powder feeding amount of the powder feeding mechanism, and the electrostatic voltage and spray gun moving speed of the spray gun mechanism.

[0051] Specifically, real-time detection of coating thickness refers to continuously monitoring the thickness of the coating during the spraying process using a non-contact sensor (such as an eddy current sensor or a laser sensor); the thickness deviation threshold is a pre-set allowable error range, when the actual coating thickness exceeds this range, the system will trigger the compensation mechanism; the lateral displacement compensation of the spray gun refers to the spray gun making a small movement in the direction perpendicular to the axis of the slender tube to adjust the spraying position and ensure uniform coating thickness; the rotation speed information of the pipe provided by the real-time feedback of the piezoelectric centrifugal switch is the accurate monitoring of the rotation speed of the pipe by the piezoelectric ceramic element, and the speed data is transmitted to the control system for cooperative adjustment of the powder feeding and spray gun parameters.

[0052] In a feasible implementation, during the spraying process, the system detects the coating thickness in real time through sensors installed near the elongated pipe, and the detection frequency can reach 10-20 times per second. When the coating thickness deviation exceeds the set threshold value (such as ±10 μm), the system quickly triggers the transverse displacement compensation mechanism of the spray gun. For example, if it is detected that the coating thickness at a certain position exceeds the upper limit of 15 μm, the spray gun will move 0.5-1.0 mm in the transverse direction for compensation spraying, so that the thickness deviation is restored to the allowable range. At the same time, the system combines the pipe rotation speed information (with an accuracy of ±0.1 r / min) fed back by the piezoelectric centrifugal switch to cooperatively adjust the parameters of the powder feeding mechanism and the spray gun mechanism. Through the cooperative regulation of multiple parameters, the uniformity of the coating thickness is effectively improved, the standard deviation of the coating thickness is reduced, the spraying quality is significantly improved, and the production efficiency is ensured.

[0053] Further, the method of the application further comprises:

[0054] M groups of piezoelectric ceramic sheets are distributed along the flow guide groove, and a piezoelectric sensor array is arranged; when it is detected that the centrifugal acceleration exceeds the preset acceleration threshold value, a self-cleaning mode of the flow guide groove is triggered, and in the pipe starting and stopping stage, real-time centrifugal force sensing and response are performed in the self-cleaning mode of the flow guide groove, high-frequency vibration is generated by applying a driving voltage signal to the M groups of piezoelectric ceramic sheets, and the high-frequency vibration is transmitted to the surface of the flow guide groove.

[0055] Specifically, the M groups of piezoelectric ceramic sheets refer to multiple groups of piezoelectric ceramic elements installed on the flow guide groove, which are used to sense the centrifugal acceleration and generate high-frequency vibration; the piezoelectric sensor array refers to a sensor network composed of multiple piezoelectric ceramic sheets according to a specific layout, which is used to monitor the stress state of the flow guide groove in real time; the centrifugal acceleration refers to the outward acceleration of the surface of the flow guide groove generated due to rotation during the rotation of the pipe; the preset acceleration threshold value refers to a pre-set upper limit value of the centrifugal acceleration, when the actual acceleration exceeds this value, the system will trigger the self-cleaning mode; the self-cleaning mode of the flow guide groove refers to the process of removing the residual powder on the surface of the flow guide groove through high-frequency vibration; the driving voltage signal refers to an electrical signal used to excite the piezoelectric ceramic sheet to generate vibration, and the frequency and amplitude of the driving voltage signal determine the effect of the vibration.

[0056] In a feasible implementation, during the rotation of the pipe, the M groups of piezoelectric ceramic sheets distributed in the guide groove monitor the centrifugal acceleration in real time. When the centrifugal acceleration is detected to exceed a preset threshold (such as 3g), the system triggers the self-cleaning mode of the guide groove. During the start and stop of the pipe, the system applies a driving voltage signal to the piezoelectric ceramic sheet to make it generate high-frequency vibration (frequency range 10-30 kHz), and the high-frequency vibration can effectively loosen and remove the residual powder on the surface of the guide groove, so that the residual powder falls into the dust collection cavity and is removed by the negative pressure suction unit. In this way, the cleanliness of the surface of the guide groove is significantly improved, effectively preventing the interference of residual powder on the subsequent spraying process, prolonging the maintenance cycle of the equipment, and improving the production efficiency.

[0057] In summary, the beneficial effects of the embodiments of the present application are:

[0058] Due to the adoption of the surface pretreated elongated pipe arranged on the powder spraying workbench, the powder spraying workbench is provided with a powder feeding mechanism, a spray gun mechanism, a pipe fixing assembly and a pipe rotating assembly. The spray gun mechanism sprays the powder coating to the surface of the elongated pipe under the action of an electrostatic field, and determines a first operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly. The powder feeding mechanism adjusts the powder feeding pressure according to a preset powder feeding amount to convey the powder coating in the powder feeding pipeline and into the spray gun mechanism, and determines a second operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly. The powder feeding mechanism includes a double powder feeding channel. Based on the spray gun mechanism and the first operation parameter combination, the powder feeding mechanism and the second operation parameter combination, the helix angle of the guide groove is dynamically adjusted based on the integrated anti-adhesion guide structure in the pipe rotating assembly. At the same time, the spraying uniformity is adaptively controlled in combination with the rotation speed sensing characteristics and real-time triggering mechanism of the piezoelectric centrifugal switch. The present application provides a powder spraying method, system and medium for the surface of an elongated pipe, realizes the control of coating thickness deviation by associating the spray gun mechanism with the pipe rotating assembly, dynamically adjusts the helix angle of the guide groove according to the friction torque, and uses the piezoelectric centrifugal switch to detect the rotation speed fluctuation in real time, automatically triggers the spray gun displacement compensation and the powder feeding amount adjustment to make the powder distribute in the pipe, ensures the powder spraying quality of the surface of the elongated pipe, and improves the processing efficiency.

[0059] Embodiment two, based on the same inventive concept as the powder spraying method for the surface of an elongated pipe in the foregoing embodiments, as shown in Figure 2 The present application provides a powder spraying system for the surface of an elongated pipe, wherein the system comprises:

[0060] A surface pretreatment module M100 is used to arrange the surface pretreated elongated pipe on a powder spraying workbench, and the powder spraying workbench is provided with a powder feeding mechanism, a spray gun mechanism, a pipe fixing assembly and a pipe rotating assembly.

[0061] A first operation parameter combination determination module M200 is configured to determine a first operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly, so that the gun mechanism sprays the powder coating to the surface of the elongated pipe under the action of the electrostatic field.

[0062] A second operation parameter combination determination module M300 is configured to determine a second operation parameter combination associated with the pipe fixing assembly and the pipe rotating assembly, so that the powder feeding mechanism adjusts the powder feeding pressure to convey the powder coating in the powder feeding pipeline and into the gun mechanism according to a preset powder feeding amount, and the powder feeding mechanism comprises a double powder feeding channel.

[0063] A dynamic adjustment module M400 is configured to dynamically adjust the spiral angle of the flow guide groove of the anti-adhesion flow guide structure integrated in the pipe rotating assembly based on the gun mechanism and the first operation parameter combination, the powder feeding mechanism and the second operation parameter combination.

[0064] An adaptive control module M500 is configured to simultaneously perform adaptive control of spraying uniformity in combination with the rotation speed sensing characteristics and real-time triggering mechanism of the piezoelectric centrifugal switch.

[0065] Further, the first operation parameter combination determination module M200 is configured to perform the following method:

[0066] According to the distance between the gun and the surface of the elongated pipe, the moving speed of the gun is adjusted; according to the correlation index of the gun angle and the uniformity of the coating thickness, the gun angle is set according to the length of the elongated pipe; a mapping relationship table of the pipe diameter and the electrostatic voltage is established, and the first operation parameter combination is obtained by integrating the moving speed of the gun, the gun angle and the electrostatic voltage determined by using the mapping relationship table.

[0067] Further, the first operation parameter combination determination module M200 is configured to perform the following method:

[0068] A high-voltage electrostatic generator is configured, and the device technical parameters of the high-voltage electrostatic generator include an output voltage range and an output current range; the electrode spacing is dynamically adjusted according to the surface roughness of the pipe, the multi-electrode electrostatic field strength distribution is optimized, and the output voltage value and the output current value corresponding to the device technical parameters are fine-tuned in combination with the spraying environment temperature and humidity.

[0069] Further, the second operation parameter combination determination module M300 is configured to perform the following method:

[0070] The primary powder feeding channel in the double powder feeding channel adopts a screw pump to control powder flow parameters, including output flow range and powder particle size; the secondary powder feeding channel in the double powder feeding channel integrates an ultrasonic atomization device, and ultrasonic atomization parameters include atomization frequency range and atomized particle size; wherein, according to the pipe outer diameter and the pipe wall thickness, the powder feeding proportion of the primary powder feeding channel and the secondary powder feeding channel is dynamically adjusted, and a differentiated powder feeding strategy is set.

[0071] Further, the second operation parameter combination determination module M300 is also used to execute the following method:

[0072] The pipe rotating assembly includes a servo motor driving unit; when it is detected that the friction torque of the flow guide groove and the pipe wall exceeds the torque threshold value, an angle fine adjustment instruction is triggered; after receiving the angle fine adjustment instruction, the servo motor driving unit adjusts the pipe rotating angle to change the contact state of the flow guide groove and the pipe wall.

[0073] Further, the dynamic adjustment module M400 is used to execute the following method:

[0074] The flow guide groove surface treatment is performed on the anti-adhesion flow guide structure to determine the friction coefficient; a dust collection cavity is arranged at the bottom of the flow guide groove; a negative pressure suction unit is arranged in the dust collection cavity to remove the stripped powder in real time.

[0075] Further, the adaptive control module M500 is also used to execute the following method:

[0076] The coating thickness is detected in real time; when it is detected that the thickness deviation exceeds the thickness deviation threshold value, a spray gun transverse displacement compensation is triggered; at the same time, combined with the pipe rotating speed information fed back in real time by the piezoelectric centrifugal switch, the powder feeding pressure and the powder feeding amount of the powder feeding mechanism and the electrostatic voltage and the spray gun moving speed of the spray gun mechanism are adjusted.

[0077] Further, the adaptive control module M500 is also used to execute the following method:

[0078] A group of piezoelectric ceramic sheets are distributed along the flow guide groove, and a piezoelectric sensor array is arranged; when it is detected that the centrifugal acceleration exceeds the preset acceleration threshold value, a flow guide groove self-cleaning mode is triggered; in the pipe start-stop stage, real-time centrifugal force sensing and response are performed in the flow guide groove self-cleaning mode, high-frequency vibration is generated by applying a driving voltage signal to the M group of piezoelectric ceramic sheets, and the high-frequency vibration is transmitted to the surface of the flow guide groove.

[0079] Example 3: Based on the same inventive concept as the powder coating method for the surface of a slender tube in Example 1, the present invention also provides an electronic device, including: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the steps of the method described in Example 1.

[0080] like Figure 3 As shown, the bus architecture is represented by bus 300. Bus 300 may include any number of interconnected buses and bridges, connecting various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 305 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 can be used to store data used by processor 302 during operation.

[0081] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the invention is not 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 powder coating method for the surface of a slender tube, characterized in that, The method includes: The pre-treated slender tube is placed on the powder spraying workbench, which is equipped with a powder feeding mechanism, a spray gun mechanism, a tube fixing assembly, and a tube rotating assembly. Under the action of an electrostatic field, the spray gun mechanism sprays powder coating onto the surface of the slender tube, and determines the first combination of operating parameters associated with the tube fixing assembly and the tube rotating assembly; The powder feeding mechanism adjusts the powder feeding pressure according to the preset powder feeding amount so that the powder coating is transported in the powder feeding pipe and enters the spray gun mechanism. It determines the second operating parameter combination associated with the pipe fixing assembly and the pipe rotating assembly. The powder feeding mechanism includes dual powder feeding channels. Based on the spray gun mechanism and the first combination of operating parameters, the powder feeding mechanism and the second combination of operating parameters, the spiral angle of the guide groove is dynamically adjusted by the anti-adhesion guide structure integrated in the pipe rotating assembly. Meanwhile, the uniformity of spraying is adaptively controlled by combining the speed sensing characteristics of the piezoelectric centrifugal switch with the real-time triggering mechanism. The spray gun mechanism sprays powder coating onto the surface of a slender tube under the action of an electrostatic field. A first combination of operating parameters associated with the tube fixing assembly and the tube rotating assembly is determined. The method includes: Adjust the spray gun's moving speed according to the distance between the spray gun and the surface of the slender tube; Based on the correlation index between spray gun angle and coating thickness uniformity, the spray gun angle is set according to the length of the slender tube; Establish a mapping table between the diameter of the slender tube and the electrostatic voltage, and integrate the spray gun moving speed, spray gun angle and the electrostatic voltage determined by the mapping table to obtain the first combination of operating parameters; The spray gun mechanism includes an electrostatic field generator, and the method includes: A high-voltage electrostatic generator is configured, and the technical parameters of the high-voltage electrostatic generator include the output voltage range and the output current range. The electrode spacing is dynamically adjusted according to the surface roughness of the pipe fittings to optimize the multi-electrode electrostatic field intensity distribution. The output voltage and output current values ​​corresponding to the technical parameters of the equipment are also fine-tuned in combination with the temperature and humidity of the spraying environment. The powder feeding mechanism includes dual powder feeding channels, and the method includes: The primary powder feeding channel in the dual powder feeding channel uses a screw pump to control the powder flow parameters, which include the output flow range and powder particle size. The secondary powder feeding channel in the dual powder feeding channel integrates an ultrasonic atomizing device, and the ultrasonic atomizing parameters include the atomizing frequency range and the atomized particle size. Specifically, based on the outer diameter and wall thickness of the pipe fittings, the powder feeding ratio of the primary powder feeding channel and the secondary powder feeding channel is dynamically adjusted to set a differentiated powder feeding strategy.

2. The powder coating method for the surface of a slender tube as described in claim 1, characterized in that, The rotating assembly of the tubular component includes a servo motor drive unit; When the friction torque between the guide channel and the pipe wall exceeds the torque threshold, an angle fine-tuning command is triggered. After receiving the angle fine-tuning command, the servo motor drive unit adjusts the rotation angle of the pipe fitting to change the contact state between the guide groove and the pipe wall.

3. The powder coating method for the surface of a slender tube as described in claim 2, characterized in that, The method includes dynamically adjusting the helix angle of the guide groove using the anti-adhesion guide structure integrated in the rotating assembly of the pipe fitting. The surface of the anti-adhesion flow guiding structure is treated with flow guiding groove to determine the friction coefficient; A dust collection chamber is provided at the bottom of the guide channel; the dust collection chamber is equipped with a negative pressure suction unit, which removes the stripping powder in real time.

4. The powder coating method for the surface of a slender tube as described in claim 3, characterized in that, The method for adaptive control of coating uniformity by combining the speed sensing characteristics and real-time triggering mechanism of a piezoelectric centrifugal switch includes: Real-time detection of coating thickness; When the thickness deviation exceeds the thickness deviation threshold, the lateral displacement compensation of the spray gun is triggered. Simultaneously, by combining the real-time feedback information on the pipe rotation speed from the piezoelectric centrifugal switch, the powder feeding pressure and powder feeding amount of the powder feeding mechanism, as well as the electrostatic voltage and spray gun movement speed of the spray gun mechanism, are adjusted in a coordinated manner.

5. The powder coating method for the surface of a slender tube as described in claim 4, characterized in that, The method includes: M groups of piezoelectric ceramic sheets are distributed along the flow guide groove, and a piezoelectric sensor array is set up. When the centrifugal acceleration exceeds the preset acceleration threshold, the self-cleaning mode of the guide channel is triggered. During the start-up and shutdown phase of the pipe fitting, the centrifugal force is sensed and responded to in real time using the self-cleaning mode of the guide channel. High-frequency vibration is generated by the driving voltage signal applied to the M groups of piezoelectric ceramic sheets, and the high-frequency vibration is transmitted to the surface of the guide channel.

6. A powder coating system for the surface of a slender tube, characterized in that, A powder coating method for implementing the method for coating the surface of an elongated tube according to any one of claims 1-5, the system comprising: A surface pretreatment module is used to place the surface-pretreated slender tube on a powder spraying workbench, which is equipped with a powder feeding mechanism, a spray gun mechanism, a tube fixing assembly, and a tube rotating assembly. The first operating parameter combination determination module is used to determine the first operating parameter combination associated with the pipe fixing assembly and the pipe rotating assembly when the spray gun mechanism sprays powder coating onto the surface of the slender tube under the action of an electrostatic field. The second operating parameter combination determination module is used to determine the second operating parameter combination associated with the pipe fixing component and the pipe rotating component according to the preset powder feeding amount and the powder feeding pressure so that the powder coating is transported in the powder feeding pipe and enters the spray gun mechanism. The powder feeding mechanism includes a dual powder feeding channel. The dynamic adjustment module is used to dynamically adjust the helix angle of the guide groove based on the spray gun mechanism and the first combination of operating parameters, the powder feeding mechanism and the second combination of operating parameters, and the anti-adhesion guide structure integrated in the pipe rotating assembly. The adaptive control module is used to simultaneously combine the speed sensing characteristics of the piezoelectric centrifugal switch with the real-time triggering mechanism to perform adaptive control of spray uniformity.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a powder coating method for the surface of a slender tube as described in any one of claims 1-5.

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