An automatic drying device for motor rotor paint surface and a control method thereof

Abstract

The embodiment of the present application provides a kind of motor rotor paint surface automatic drying device, it is related to the technical field of motor rotor paint surface drying technology.The device includes: heating drying channel and the conveying device that passes through the heating drying channel, the bearing seat for carrying motor rotor is equipped on the conveying device, preheating zone, first drying zone and second drying zone are equipped in heating drying channel;It further includes control method, in the case where actual ambient temperature and / or actual ambient wind speed and preset target ambient temperature or target ambient wind speed exist deviation, processor generates deviation signal to adjust heater and tuyere.By the present application, the problem of low paint drying quality is solved, and the effect of improving paint drying quality is achieved.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of motor rotor paint surface drying, in particular to a motor rotor paint surface automatic drying device and a control method thereof. BACKGROUND

[0002] In the manufacturing process of motors, generators and various rotating machines, coating insulating paint on the surface of the rotor core and winding and drying and curing are key processes for ensuring the electrical insulation performance, mechanical stability and environmental resistance of the motor.

[0003] The current heating mode is prone to cause a series of process defects. For example, too rapid temperature rise may cause the paint surface to be prematurely "skinned", wrap the internal solvent, and form bubbles or pinholes when the internal solvent boils during subsequent heating. Alternatively, overall high-temperature baking is prone to generate huge thermal stress and chemical shrinkage stress in the paint surface, resulting in paint surface cracking and adhesion reduction after cooling. Therefore, the prior art cannot finely guide and control the complex phase change process of the paint surface from liquid to solid, resulting in poor performance consistency of the final cured paint surface, high defect rate, and difficulty in actively optimizing the internal microstructure and macroscopic performance of the paint surface according to design requirements. SUMMARY

[0004] The embodiment of the application provides a motor rotor paint surface automatic drying device and a control method thereof, so as to at least solve the problem that different sizes of motor rotors cannot be adapted in the related art.

[0005] According to an embodiment of the application, a motor rotor paint surface automatic drying device is provided, comprising a heating drying tunnel and a conveying device penetrating through the heating drying tunnel, a bearing seat for bearing a motor rotor is arranged on the conveying device, and the heating drying tunnel comprises:

[0006] a preheating zone located in the heating drying tunnel, the preheating zone is provided with a plurality of first heaters, a first air nozzle and a second air nozzle, the first air nozzle is located above the conveying device, the second air nozzle is located above both sides of the conveying device, the first air nozzle and the second air nozzle are used for preliminarily air drying the motor rotor paint surface fixed on the conveying device, and the first heaters are used for preheating the motor rotor paint surface;

[0007] a first drying zone arranged in the downstream direction of the preheating zone in the heating drying tunnel, the first drying zone is provided with a plurality of second heaters, and the temperature of the first drying zone gradually increases and then gradually decreases along the conveying direction;

[0008] a second drying zone arranged in the downstream direction of the first drying zone in the heating drying tunnel, the second drying zone is provided with a plurality of third heaters, and the temperature of the second drying zone is lower than the lowest temperature of the first drying zone;

[0009] A control system comprises a processor in communication with a heater and a blow nozzle, and a sensor for obtaining actual ambient temperature and actual ambient wind speed of the preheating zone, the first drying zone and the second drying zone, and the processor generates a deviation signal to adjust the heater and the blow nozzle when the actual ambient temperature and / or the actual ambient wind speed deviates from a preset target ambient temperature or target ambient wind speed.

[0010] In an example embodiment, the conveying device comprises a frame, two parallel conveying chain assemblies mounted on the frame, and a driving assembly for driving the conveying chain assemblies, each of the conveying chain assemblies comprises a conveying chain, a driving sprocket, a driven sprocket and a longitudinal beam, the driving sprocket and the driven sprocket are rotatably mounted at two ends of the longitudinal beam, the conveying chain is tensioned on the driving sprocket and the driven sprocket, the carrier seat is fixed on the conveying chain, and the driving assembly drives the driving sprocket to rotate, so that the conveying chain drives the carrier seat to move in the conveying direction.

[0011] The conveying device further comprises a first adjusting mechanism and a second adjusting mechanism for respectively adjusting the lateral positions of the two conveying chain assemblies, and each of the first adjusting mechanism and the second adjusting mechanism comprises:

[0012] Two transversely arranged lead screws are respectively mounted at the leading end and the trailing end of the frame in the conveying direction.

[0013] A nut sleeve in threaded cooperation with the two lead screws is fixedly arranged on the corresponding longitudinal beam.

[0014] A driving part for driving one of the lead screws to rotate, and a synchronous chain assembly for connecting the two lead screws to rotate synchronously.

[0015] In an example embodiment, the first blow nozzle forms an angle of 15-30° with the vertical direction.

[0016] In an example embodiment, the second blow nozzle is tangent to the circumferential surface of the rotor of the motor.

[0017] In an example embodiment, the first drying zone is provided with a plurality of third blow nozzles, and the air flow speed of the third blow nozzles arranged in the conveying direction gradually decreases.

[0018] In an example embodiment, the second drying zone is provided with a plurality of fourth blow nozzles, and the air flow speed of the fourth blow nozzles is less than the minimum air flow speed of the third blow nozzles.

[0019] According to another embodiment of the present application, a control method of an automatic drying device for motor rotor paint surface is provided, which is applied to the automatic drying device for motor rotor paint surface, and comprises the following steps:

[0020] obtaining motor rotor parameters and paint surface parameters, wherein the motor rotor parameters include size parameters and material parameters of the motor rotor, and the paint surface parameters include paint surface attribute parameters;

[0021] determining an automatic drying strategy based on the motor rotor parameters and the paint surface parameters, wherein the automatic drying strategy includes target environment temperature and target environment airflow speed at a plurality of position points on a conveying path of a conveying device;

[0022] adjusting operation parameters of at least one heater and at least one air nozzle arranged on the conveying path based on the automatic drying strategy, so as to build a thermal kinetic energy layered profile on the conveying path, wherein the thermal kinetic energy layered profile includes a preheating zone, a first drying zone and a second drying zone;

[0023] driving the motor rotor to pass through the preheating zone, the first drying zone and the second drying zone in sequence along the conveying path by the conveying device, so as to perform gradient drying and forming on the paint film layer on the surface of the motor rotor.

[0024] In an example embodiment, the adjusting operation parameters of the at least one heater and the at least one air nozzle arranged on the conveying path based on the automatic drying strategy comprises the following steps:

[0025] obtaining actual environment temperature and actual environment airflow speed at a plurality of position points in a heating drying channel;

[0026] comparing the actual environment temperature and the actual environment airflow speed with preset target environment temperature and target environment airflow speed to obtain a deviation signal;

[0027] dynamically adjusting operation parameters of the heater and the air nozzle in the heating drying channel based on the deviation signal.

[0028] According to still another embodiment of the present application, a computer readable storage medium is also provided, wherein the computer readable storage medium stores a computer program, and the computer program is configured to execute the steps in any of the method embodiments when running.

[0029] According to still another embodiment of the present application, an electronic device is also provided, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps in any of the method embodiments.

[0030] Through the application, since multiple heating areas are arranged in the heating tunnel, and the temperature and air flow speed are cooperatively and gradiently regulated, the problem of low paint drying quality can be solved, and the effect of improving the paint drying quality is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural diagram of an automatic paint drying device for a motor rotor according to an embodiment of the application;

[0032] Figure 2 is a partial structural diagram of an automatic paint drying device for a motor rotor according to an embodiment of the application;

[0033] Figure 3 is Figure 2 a partial structural enlarged view.

[0034] In the figure, 1 is a heating tunnel, 2 is a rack, 21 is a bearing seat, 211 is a V-shaped positioning groove, 22 is a driving sprocket, 23 is a longitudinal beam, 24 is a cross shaft, 25 is a driving motor, 26 is a transmission mechanism, 27 is a bearing seat, 281 is a hand wheel, 282 is a lead screw, 283 is a guide rod, 284 is a synchronous wheel, 285 is an adjusting seat, 3 is a preheating area, 4 is a first drying area, and 5 is a second drying area. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the application will be described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application.

[0036] Hereinafter, the terms "first", "second", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more features. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In addition, in the present application, the orientation terms such as "up", "down", "left", "right", etc. can include but not limited to the orientation defined by the relative position of the components in the figure, and it should be understood that these directional terms can be relative concepts, which are used for relative description and clarification, and they can be changed accordingly according to the change of the position of the components in the figure.

[0038] In the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium. In addition, the term "coupling" can be an electrically connected way to achieve signal transmission.

[0039] As used herein, "about", "approximately", or "around" includes the stated value and the average value within an acceptable range of deviation from the particular value, wherein the acceptable range of deviation is determined by the person of ordinary skill in the art considering the measurement being discussed and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0040] In the present embodiment, as shown in Figures 1-3 An automatic drying device for motor rotor paint is provided, which is used for drying the paint of a motor rotor, and specifically comprises a heating drying channel 1 and a conveying device penetrating through the heating drying channel. The conveying device is provided with a bearing seat 21 for bearing the motor rotor (not shown in the figure). The motor rotor after painting is placed on the bearing seat 21 and moves through the heating drying channel 1 to complete the drying and curing of the paint.

[0041] The conveying device comprises a rack 2 as a basic support, which in the present embodiment is preferably built with aluminum alloy profiles. Two conveying chain assemblies are installed in parallel on the rack 2, and a plurality of motor rotors are supported at equal intervals or unequal intervals between the two conveying chain assemblies. The rack 2 is also provided with a driving assembly for driving the conveying chain assemblies to act and a spacing adjustment mechanism for adjusting the spacing between the two conveying chain assemblies.

[0042] Each conveying chain assembly comprises a conveying chain (not shown in the figure), a driving sprocket 22, a driven sprocket (not shown in the figure), and a longitudinal beam 23. The longitudinal beam 23 is arranged to extend in the conveying direction, and the driving sprocket 22 and the driven sprocket are rotatably installed at the head and tail ends of the longitudinal beam 23, respectively. The conveying chain is tensioned on the driving sprocket 22 and the driven sprocket. A plurality of bearing seats 21 are fixed at equal intervals or unequal intervals on the conveying chain, and each bearing seat 21 is provided with a V-shaped positioning groove 211 for bearing the journal of the motor rotor.

[0043] The driving assembly comprises a driving motor 25, a transmission mechanism and a cross shaft 24. The driving motor 25 is fixedly installed in the frame 2, and the cross shaft 24 is arranged perpendicularly to the longitudinal beams 23, with both ends thereof rotatably installed on the frame 2 through bearing seats 27. The driving motor 25 is connected with the cross shaft 24 through the transmission mechanism 26. When the driving motor 25 works, the power is transmitted to the cross shaft 24 through the transmission mechanism 26, and the cross shaft 24 drives the two driving sprockets 22 to rotate synchronously, thereby driving the conveying chains to move along the conveying direction with the motor rotors on the bearing seats 21, and stably passing through the heating oven 1.

[0044] The distance adjusting mechanism comprises symmetrically arranged first and second adjusting mechanisms for independently adjusting the transverse positions of the left and right conveying chain assemblies. The first and second adjusting mechanisms are identical in structure, and each comprises two horizontally arranged lead screws 282, two nut sleeves (not shown in the figure) threadedly matched with the two lead screws 282, a driving part and a synchronous chain assembly. The two lead screws 282 are rotatably installed at the front and rear ends of the frame 2 in the conveying direction, i.e. the front end lead screw and the rear end lead screw. The nut sleeves are fixedly arranged in the longitudinal beams 23 of the conveying chain assemblies to be adjusted while threadedly matched with the lead screws 282. The driving part is a hand wheel 281 fixedly connected to the end of one of the lead screws 282. The synchronous chain assembly comprises two synchronous wheels 284 fixedly arranged on the same side of the front end lead screw and the rear end lead screw, and a synchronous chain (not shown in the figure) tensioned on the two synchronous wheels 284. The synchronous chain assembly can connect the two lead screws 282 at the front and rear ends to make them rotate synchronously, thereby ensuring that the longitudinal beams 23 can move in parallel without deflection.

[0045] The frame 2 is fixedly provided with adjusting seats 285 on the left and right sides at the front and rear ends. The lead screws 282 of the first and second adjusting mechanisms at the same end of the frame 2 are rotatably supported between the left and right adjusting seats 285 at the end through bearings. A guide rod 283 parallel to the lead screws 282 is fixedly arranged between the left and right adjusting seats 285 at the front and rear ends. The two ends of the two longitudinal beams 23 are slidably sleeved on the front and rear guide rods 283, and the guide rods 283 provide a guide for the transverse movement of the longitudinal beams 23.

[0046] The pitch adjustment process of the conveying chain assembly is as follows: when it is necessary to adapt to different lengths of motor rotors, an operator can rotate the corresponding hand wheel 281 to drive the lead screw 282 connected thereto to rotate, and accurately transmit to the lead screw 282 located at the other end of the rack 2 through the synchronous chain assembly, so that the two lead screws 282 rotate synchronously and in the same direction. The rotary motion of the lead screw 282 is converted into the transverse translational motion of the entire longitudinal beam 23 through the lead screw nut structure. By respectively operating the two hand wheels 281, the transverse positions of the left and right longitudinal beams 23 can be independently adjusted, thereby accurately setting the carrying pitch between the two conveying chain assemblies to adapt to different specifications of motor rotors.

[0047] The heating tunnel 1 is composed of an aluminum alloy profile frame combined assembly, the frame is a steel plate guard frame, each of the upper and lower sides of the single side is provided with two doors, the upper and lower layers are respectively provided with infrared heating modules (the heating module is provided with a stainless steel reflector), which are preferably infrared heating pipes of model EIR-950, and the heating wave band is a far-infrared wave band (peak wavelength is 3-10 μm). The electromagnetic wave energy of this wave band is highly matched with the vibration frequency of the main chemical bonds (such as C-H, C-O, and O-H) of the resin macromolecule in the paint surface, which can cause resonance absorption effect, so that the heat energy is directly and efficiently transferred to the resin molecules, realizing the body heating from inside to outside, instead of inefficient surface conduction heating. Each heating module is controlled by a processor through an independent solid-state relay (SSR) for phase-shifting voltage regulation or zero-crossing chopping control, and the power regulation resolution can reach 0.1%. High-density aluminum silicate fiber insulation cotton is filled between the inner and outer shells of the heating tunnel 1, the thickness of the insulation cotton is 150 mm, and the thermal conductivity is less than 0.045 W / (m·K), so as to reduce the heat loss to the outside. The reflectivity of the inner wall of the heating tunnel 1 needs to be greater than 0.8 to enhance the reflection of infrared radiation heat energy inside, forming a more uniform radiation field. The heating tunnel 1 is provided with adjustable opening size access curtains at both ends, so as to reduce the convective exchange of air inside and outside when the motor rotor enters and exits.

[0048] In order to improve the drying quality of the paint surface and avoid paint peeling, the drying area in the heating tunnel 1 is set to gradient drying, specifically, a preheating zone 3, a first drying zone 4 and a second drying zone 5 are sequentially arranged in the conveying direction in the heating tunnel 1, wherein the preheating zone 3 is located upstream of the heating tunnel 1, the first drying zone 4 is located in the middle of the heating tunnel 1, and the second drying zone 5 is located downstream of the heating tunnel 1.

[0049] The preheating zone 3 is provided with a plurality of first heaters, a first air nozzle and a second air nozzle. The first heaters preheat the motor rotor paint surface. The first air nozzle is located above the conveying device and forms an impact airflow with the motor rotor top surface at an angle of 15-30° with the vertical direction. The second air nozzle is located above both sides of the conveying device and the airflow direction of the second air nozzle is tangent to the circumferential surface of the motor rotor, so that the airflow adheres to the rotor curved surface to form a uniform surrounding airflow. The airflow speed of the first air nozzle and the second air nozzle is preferably m / s. After the motor rotor is dried and stays in the preheating zone for 5 minutes, it is conveyed to the first drying zone 4. Under the cooperation of the first air nozzle and the second air nozzle, the solvent vapor saturated layer of the motor rotor paint surface can be quickly blown, and the solvent inside the paint surface is quickly evaporated, so that the surface layer of the paint surface is quickly desolventized, and the mass transfer process is greatly intensified. It should be noted that most of the solvent in the paint surface is removed efficiently and gently in this area, so that the paint surface forms a breathable initial skin layer with a certain mechanical strength but still has micropores for the internal solvent to continue to escape, avoiding the common surface skin problem in traditional processes.

[0050] The first drying zone 4 is provided with a plurality of second heaters and a plurality of third air nozzles. The heating temperatures of the second heaters at different positions are different, so that the temperature of the first drying zone gradually increases to and then gradually decreases along the conveying direction, and the airflow speed of the third air nozzles arranged along the conveying direction gradually decreases. The drying time of the motor rotor in this area is 11 minutes. In this area, the environmental temperature sharply rises to the highest, and the wind speed continuously decreases. At this time, the reduction of the wind speed reduces the convective heat dissipation, so that the radiant heat provided by the second heaters can more efficiently penetrate into the interior of the paint surface, activate and drive the resin molecules in the interior of the paint surface to perform a violent crosslinking polymerization reaction, so that the cured paint surface stably advances from the skin layer to the metal substrate in this area.

[0051] The second drying zone 5 is provided with a plurality of third heaters and a plurality of fourth air nozzles. The temperature of the second drying zone 5 is lower than the lowest temperature of the first drying zone 4, and is generally maintained at . At the same time, the airflow speed of the fourth air nozzle is less than the minimum airflow speed of the third air nozzle. The drying time of the motor rotor in this area is 4 minutes. In this area, the environmental temperature sharply decreases, and the wind speed also decreases to a breeze state to realize a first annealing treatment of the formed paint surface, so that the internal stress generated in the interior of the paint surface due to chemical shrinkage and thermal expansion and cold contraction is fully relaxed and released, effectively preventing cracking and wrinkling after cooling, and ensuring the long-term dimensional stability and high adhesion of the film layer.

[0052] And to realize the adaptive regulation in the drying process, the heating tunnel 1 is further provided with a control panel, the control panel is connected with a control system, the control system includes a processor and a plurality of sensors arranged in the heating tunnel 1, the processor is in communication connection with the heater and the air nozzle, the sensors are used to acquire actual environment temperature and actual environment wind speed of the preheating zone 3, the first drying zone 4 and the second drying zone 5, in the case that there is a deviation between the actual environment temperature and / or the actual environment wind speed and a preset target environment temperature or target environment wind speed, the processor generates a deviation signal to adjust the heater and the air nozzle; wherein the sensors include armored K-type thermocouples (temperature measurement range 0-600°C, accuracy ±0.5°C) and hot-wire anemometers (speed measurement range 0-20 m / s, accuracy ±2% F.S.); the processor uses a Siemens SIMATIC IPC as an upper computer, is responsible for running the control panel, managing a strategy database and performing complex algorithm operations, and uses a high-speed EtherCAT bus controller as a lower computer, connects all servo motors, frequency converters, solid-state relays and sensors through a bus.

[0053] Specifically, the above control process is realized by a motor rotor paint surface automatic drying device control method, and the flow includes the following steps:

[0054] S310: Determine the automatic drying strategy corresponding to the motor rotor.

[0055] In this embodiment, it is necessary to determine the drying curve according to the related parameters of the motor rotor and the related parameters of the paint surface, and the core is two continuous functions distributed along the position coordinates of the conveying path : target environment temperature curve T(x) and target environment airflow velocity curve v(x).

[0056] The operator inputs the current batch of motor rotor parameter information on the control panel, including (but not limited to) the model parameters of the motor rotor (such as: model YZR-250, size diameter 200mm, core length 300mm, material silicon steel sheet DW470) and the material attribute parameters of the paint used (such as: insulating paint brand model Alkad678, type alkyd resin paint, recommended curing temperature range 130-150°C, solvent component xylene, solid content 55%) and the like.

[0057] Then the processor retrieves a strategy file (for example, Protocol_YZR250_Alkad678.json) that best matches the current input parameters through a preset multi-key matching algorithm, and loads it into the memory.

[0058] Exemplarily, for the combination of the above-mentioned YZR-250 type rotor and the Alkad 678 type paint, the strategy file loaded by the processor defines the speed of the conveying device as 0.5 meters per minute, which corresponds to the following target environmental profile function:

[0059] The preheating zone 3 (corresponding to 0-0.5 meters) aims to efficiently remove a large amount of solvent from the surface of the paint without excessively heating the paint surface by using the forced convection effect of high-speed airflow to avoid rapid skinning of the surface; in this zone, a medium constant temperature is set , a high constant airflow speed is set .

[0060] It should be noted that the solvent evaporation rate of the paint surface (unit: mol / (m²·s)) can be described by the following formula:

[0061]

[0062] wherein, is the mass transfer coefficient, is the solvent saturation vapor pressure of the paint surface, is the solvent partial pressure in the surrounding air, is the ideal gas constant, is the film temperature; high-speed airflow can greatly increase the mass transfer coefficient , which is proportional to the Sherwood number (Sh) in fluid mechanics, and Sh is a function of the Reynolds number (Re) and the Schmidt number (Sc): Since , increasing the airflow speed v will significantly increase the Reynolds number Re, thereby doubling; at the same time, high-speed airflow can quickly blow away the evaporated solvent, so that is always close to zero, thereby maintaining the maximum evaporation driving force , and the medium temperature (70°C) is to moderately increase without causing rapid crosslinking (skinning) of the paint surface.

[0063] The first drying zone 4 (corresponding to 0.5-1 meters): the goal is to activate and promote the chemical crosslinking reaction inside the paint surface; in this zone, is a downward-opening parabola that reaches a peak temperature of 150°C at 1 meter:

[0064]

[0065] ​wherein, is the initial temperature, is the temperature coefficient, is the initial coordinate.

[0066] is a linearly decreasing curve, from m / s to m / s; the wind speed is reduced in order to reduce the convective heat loss and allow the infrared radiation heat to penetrate more effectively into the paint film:

[0067]

[0068] wherein, is the initial wind speed, is the final wind speed, is the final position coordinate.

[0069] In particular, at this stage, the total heat flux density experienced by the motor rotor is the sum of the radiation and convection and is:

[0070]

[0071] wherein, is the emissivity of the paint film, is the Stefan-Boltzmann constant, is the convective heat transfer coefficient; the linear reduction of the wind speed causes the convective heat transfer coefficient (which is related to the Nusselt number Nu and the Reynolds number Re) to decrease as well. This causes the contribution of the convective heat loss term to be reduced as well, while the contribution of the radiative heat transfer term from the second heater becomes dominant. This guarantees that the energy can efficiently penetrate into the paint film and be used to activate the chemical reaction, rather than being carried away by the surface air flow.

[0072] Second drying zone 5 (corresponding to m): after the end of the first drying zone 4, the paint film has accumulated considerable residual stresses inside due to the chemical shrinkage and the previous non-uniform thermal history, and if it were directly exposed to room temperature, the large temperature difference would generate additional thermal stresses whose magnitude can be approximated as:

[0073]

[0074] wherein, is the elastic modulus as a function of temperature is the thermal expansion coefficient; the total stress , thus direct exposure to room temperature easily leads to total stress exceeding the breaking strength of the paint surface, resulting in cracking; thus the role of this zone is to perform controlled cooling and stress release on the paint surface which has been substantially solidified; in this zone, is set to a low constant temperature , is set to a low air flow speed , thus reducing the instantaneous , and since at the beginning of cooling, the paint surface temperature is still higher than its glass transition temperature (Tg), the material is in a viscoelastic state, the elastic modulus is low, and through low constant temperature and low air flow speed, stress relaxation can be significantly achieved, thus enabling the release of most of the residual stress of the paint surface; in particular, the cooling rate R can be expressed as: , preferably R is less than or equal to 5°C / min, to avoid the generation of micro-cracks.

[0075] After the processor loads these function definitions, it will discretize them into specific setting values for each heater and air nozzle.

[0076] S320: Based on the automated drying strategy, construct and stably maintain the thermal kinetic stratified profile.

[0077] Before the motor rotor enters the preheating zone 3, the processor first initializes and, according to the strategy file loaded in S310, issues initial operating parameter instructions to all heaters and air nozzles, for example, for the heaters and air nozzles in the first drying zone 4, instruct them to work cooperatively to achieve and maintain an ambient temperature of 80°C and an air flow speed of 5 m / s.

[0078] After the processor is started, it will continuously monitor the real-time data fed back by all sensors; in the initial stage, the actual temperature and air speed profile will differ from the target profile, at which point the preset closed-loop control algorithm adaptively adjusts the power of each heater and the rotation speed of each air nozzle according to the deviation, until the difference between the actual value measured by all sensors in the entire heating tunnel 1 and the target value corresponding to its position is less than a very small threshold value, thus obtaining a stable thermal kinetic stratified profile, which, as can be easily understood, includes the aforementioned preheating zone 3, first drying zone 4 and second drying zone 5.

[0079] S330: The conveying device conveys the motor rotor, so that the motor rotor sequentially passes through the preheating zone 3, first drying zone 4 and second drying zone 5.

[0080] After the thermal kinetic stratified profile is stabilized, the processor starts the conveying device, so that the motor rotor coated with wet paint enters the heating tunnel at a speed of 0.5 meters per minute and sequentially experiences the aforementioned three zones for drying treatment.

[0081] S340: Perform dynamic closed-loop control in the heating oven.

[0082] In this embodiment, the processor polls all sensors at a high frequency, thereby obtaining the real-time state of the aforementioned profile in real time, and for each sensor node, the processor calculates the deviation of its measured value from the target value, and these deviation signals are input into a set of PID (proportional-integral-derivative) controllers for calculating real-time adjustments to the heater power and the speed of the air nozzle, to counter various internal and external disturbances (such as power grid fluctuations and environmental temperature changes) in real time, ensuring that the thermal kinetic energy profile in the heating oven 1 is always locked on the preset strategy with extremely high precision, thereby ensuring the high precision of the process and the high repeatability of the production.

[0083] Specifically, the actual ambient temperature and the actual ambient airflow speed at multiple position points in the heating oven 1 are obtained;

[0084] The actual ambient temperature and the actual ambient airflow speed are compared with the preset target ambient temperature and target ambient airflow speed to obtain deviation signals;

[0085] Based on the deviation signals, the operating parameters of the heater and the air nozzle in the heating oven 1 are dynamically adjusted.

[0086] Thus far, the present embodiment achieves the following beneficial effects:

[0087] 1. Fine control of the paint drying and curing process is achieved, with temperature and airflow speed being synergistically and gradiently regulated, enabling process control to move from single dimension and static to multi-dimension and dynamic.

[0088] 2. Through regional and phased drying, defects such as air bubbles, pinholes, and cracking in traditional processes can be addressed in a targeted manner, significantly improving the yield and quality consistency of the cured paint surface.

[0089] 3. The actively constructed performance gradient (such as hard on the outside and tough on the inside) can impart the paint surface with superior comprehensive mechanical properties and environmental resistance, thereby improving the overall reliability of the motor product.

[0090] 4. By optimizing the efficiency of energy delivery in time and space, such as using wind energy to replace part of the thermal energy in the kinetic energy dominant domain, and concentrated and efficient heating in the thermal energy penetration domain, the drying cycle can be effectively shortened, and the energy consumption per unit product can be reduced.

[0091] Those skilled in the art can clearly understand that the method according to the above-mentioned embodiments can be realized by means of software on a general hardware platform, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device) to execute the method described in each embodiment of the present application.

[0092] It should be noted that the above-mentioned modules can be realized by software or hardware, and for the latter, the following implementation manners can be used, but are not limited thereto: the above-mentioned modules are located in the same processor; or the above-mentioned modules are located in different processors in any combination.

[0093] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the computer program is configured to execute the steps in any of the above-mentioned method embodiments when running.

[0094] In an example embodiment, the above-mentioned computer readable storage medium can include, but is not limited to, a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store computer programs.

[0095] The embodiments of the present application also provide an electronic device, which includes a memory and a processor, the memory stores a computer program, and the processor is configured to execute the computer program to execute the steps in any of the above-mentioned method embodiments.

[0096] In an example embodiment, the above-mentioned electronic device can also include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional modules is exemplified, and in actual application, the above-mentioned functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0098] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the division of the apparatus embodiments is merely an example, and for example, the division of the modules or units can be different, and for example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0099] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, i.e., may be located in one place, or may be distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0100] In addition, each functional unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can be physically present separately, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0101] If the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application essentially or the parts that make contributions to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium, and includes a number of instructions to make a device (which can be a single chip, a chip, etc.) or a processor (processor) execute all or part of the steps of the various embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read only memory (read only memory, ROM), a random access memory (random access memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0102] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An automatic drying device for motor rotor paint surface, comprising a heating drying channel and a conveying device penetrating through the heating drying channel, a bearing seat for bearing a motor rotor is arranged on the conveying device, characterized in that, The heating tunnel comprises: a preheating zone located in the heating tunnel, the preheating zone being provided with a plurality of first heaters, a first air nozzle and a second air nozzle, the first air nozzle being located above the conveying device, the second air nozzle being located above both sides of the conveying device, the first air nozzle and the second air nozzle being used for preliminarily air-drying the motor rotor paint surface fixed on the conveying device, the first heaters being used for preheating the motor rotor paint surface; a first drying zone located in the heating tunnel in a downstream direction of the preheating zone, the first drying zone being provided with a plurality of second heaters, the temperature of the first drying zone gradually increasing and then gradually decreasing along the conveying direction; a second drying zone located in the heating tunnel in a downstream direction of the first drying zone, the second drying zone being provided with a plurality of third heaters, the temperature of the second drying zone being lower than the lowest temperature of the first drying zone; a control system comprising a processor and a sensor, the processor being in communication connection with the heaters and the air nozzles, the sensor being used for acquiring the actual environmental temperature and the actual environmental wind speed of the preheating zone, the first drying zone and the second drying zone, and the processor generating a deviation signal to adjust the heaters and the air nozzles in the case that the actual environmental temperature and / or the actual environmental wind speed deviates from the preset target environmental temperature or target environmental wind speed; The conveying device comprises a rack, two parallel conveying chain assemblies mounted on the rack, and a driving assembly for driving the conveying chain assemblies to move, each conveying chain assembly comprises a conveying chain, a driving sprocket, a driven sprocket and a longitudinal beam, the driving sprocket and the driven sprocket are rotatably mounted at two ends of the longitudinal beam respectively, the conveying chain is tensioned on the driving sprocket and the driven sprocket, the bearing seat is fixed on the conveying chain, and the driving assembly drives the driving sprocket to rotate, so that the conveying chain drives the bearing seat to move along the conveying direction. The conveying device further comprises a first adjusting mechanism and a second adjusting mechanism for respectively adjusting the transverse positions of the two conveying chain assemblies, and the first adjusting mechanism and the second adjusting mechanism each comprise: two transversely arranged lead screws mounted at the head and tail ends of the rack in the conveying direction respectively; a nut sleeve in thread cooperation with the two lead screws, the nut sleeve being fixedly arranged on the corresponding longitudinal beam; a driving part and a synchronous chain assembly, the driving part being used for driving one of the lead screws to rotate, and the synchronous chain assembly being used for connecting the two lead screws to make them rotate synchronously.

2. The automatic drying device for motor rotor paint surface according to claim 1, characterized in that, The first air nozzle forms an angle of 15-30° with the vertical direction.

3. The automatic drying device for motor rotor paint surface according to claim 1, characterized in that, The air outlet direction of the second air nozzle is tangent to the circumferential surface of the motor rotor.

4. The automatic drying device for motor rotor paint surface according to claim 1, characterized in that, The first drying zone is provided with a plurality of third air nozzles, and the air flow speed of the third air nozzles arranged along the conveying direction gradually decreases.

5. The automatic drying device for motor rotor paint surface according to claim 4, characterized in that, The second drying zone is provided with a plurality of fourth air nozzles, and the air flow speed of the fourth air nozzles is smaller than the minimum air flow speed of the third air nozzles.

6. A control method for an automatic drying device for motor rotor paint finish, characterized by, The motor rotor paint surface automatic drying device is applied to any one of claims 1-5, and comprises: acquiring motor rotor parameters and paint surface parameters, the motor rotor parameters comprising size parameters and material parameters of the motor rotor, and the paint surface parameters comprising paint surface attribute parameters; determining an automated baking strategy based on the motor rotor parameters and the paint surface parameters, the automated baking strategy including target ambient temperature and target ambient air flow speed at a plurality of position points on a conveying path of a conveying device; adjusting operating parameters of at least one heater and at least one air nozzle disposed on the conveying path based on the automated baking strategy to build a thermal kinetic energy layered profile on the conveying path, the thermal kinetic energy layered profile including a preheating zone, a first baking zone, and a second baking zone; driving the motor rotor along the conveying path through the preheating zone, the first baking zone, and the second baking zone in sequence by the conveying device to perform gradient baking and forming on the paint film layer on the surface of the motor rotor.

7. The control method of the motor rotor paint surface automatic drying device according to claim 6, characterized in that, The adjusting operating parameters of at least one heater and at least one air nozzle disposed on the conveying path based on the automated baking strategy includes: acquiring actual ambient temperature and actual ambient air flow speed at a plurality of position points in a heating baking tunnel; comparing the actual ambient temperature and the actual ambient air flow speed with preset target ambient temperature and target ambient air flow speed to obtain a deviation signal; based on the deviation signal, dynamically adjusting operating parameters of the heater and the air nozzle in the heating baking tunnel.

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