Automatic drying device for paint surface of motor rotor and control method of automatic drying device

Abstract

The embodiment of the invention provides a motor rotor paint surface automatic drying device, and relates to the technical field of motor rotor paint surface drying technologies. The device comprises a heating drying tunnel and a conveying device penetrating through the heating drying tunnel, the conveying device is provided with a bearing seat used for bearing a motor rotor, and a preheating area, a first drying area and a second drying area are arranged in the heating drying tunnel; the control method is characterized in that under the condition that the actual environment temperature and / or the actual environment wind speed deviates from the preset target environment temperature or target environment wind speed, the processor generates a deviation signal to adjust the heater and the tuyere. By means of the paint surface drying device, the problem that the paint surface drying quality is low is solved, and the effect of improving the paint surface drying quality is achieved.

Description

TECHNICAL FIELD

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

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

[0003] Current heating methods are prone to cause a series of process defects, for example, too fast temperature rise can cause paint surface to form "skin" too early, which wraps internal solvent, and internal solvent boils to form bubbles or pinholes when subsequent heating; Or, overall high-temperature baking can generate huge thermal stress and chemical shrinkage stress in the interior of paint surface, which causes paint surface to crack and adhesion to decrease after cooling. Therefore, the prior art cannot finely guide and control the complex phase change process of paint surface from liquid to solid, which leads to poor performance consistency of final cured paint surface, high defect rate, and difficulty in actively optimizing the internal microstructure and macroscopic performance of paint surface according to design requirements. SUMMARY

[0004] The embodiment of the present application provides a kind of motor rotor paint surface automatic drying device and control method thereof, to at least solve the problem of different sizes of motor rotor in related technology.

[0005] According to one embodiment of the present application, a kind of motor rotor paint surface automatic drying device is provided, including heating oven and the conveying device that passes through the heating oven, the conveying device is equipped with the bearing seat for carrying motor rotor, the heating oven includes: preheating zone, located in the heating oven, the preheating zone is equipped with a plurality of first heaters, first air nozzle and second air nozzle, the first air nozzle is located above the conveying device, the second air nozzle is located above the two sides of the conveying device, the first air nozzle and the second air nozzle are used to preliminarily air dry the paint surface of motor rotor fixed on the conveying device, and the first heater is used to preheat the paint surface of motor rotor; first drying zone, which is arranged in the downstream direction of the preheating zone in the heating oven, 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; second drying zone, which is arranged in the downstream direction of the first drying zone in the heating oven, 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; 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.

[0006] In one 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 respectively, 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 as to drive the conveying chain to move the carrier seat in the conveying direction. 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 plate assemblies, the first adjusting mechanism and the second adjusting mechanism each comprise: two transversely arranged lead screws respectively mounted at the leading end and the trailing end of the frame in the conveying direction; a nut sleeve in threaded cooperation with the two lead screws, the nut sleeve is fixedly arranged on the corresponding longitudinal beam; 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.

[0007] In one example embodiment, the first blow nozzle forms an angle of 15-30° with the vertical direction.

[0008] In one example embodiment, the second blow nozzle is tangent to the circumferential surface of the motor rotor.

[0009] In one 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.

[0010] In one 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.

[0011] According to another embodiment of the present application, a control method of the motor rotor paint surface automatic drying device is provided, which is applied to the aforementioned motor rotor paint surface automatic drying device and comprises: acquire motor rotor parameters and paint surface parameters, the motor rotor parameters including size parameters and material parameters of the motor rotor, and the paint surface parameters including paint surface attribute parameters; determine an automated drying strategy based on the motor rotor parameters and the paint surface parameters, the automated drying strategy including target ambient temperature and target ambient airflow speed at a plurality of position points of a conveying path of a conveying device; adjust operating parameters of at least one heater and at least one air nozzle arranged on the conveying path based on the automated drying 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 drying zone, and a second drying zone; drive 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 to perform gradient drying and forming on the paint film layer on the surface of the motor rotor.

[0012] In one example embodiment, the adjusting operating parameters of at least one heater and at least one air nozzle arranged on the conveying path based on the automated drying strategy includes: acquire actual ambient temperature and actual ambient airflow speed at a plurality of position points in the heating drying tunnel; compare the actual ambient temperature and the actual ambient airflow speed with preset target ambient temperature and target ambient airflow speed to obtain a deviation signal; based on the deviation signal, dynamically adjust operating parameters of the heater and the air nozzle in the heating drying tunnel.

[0013] According to still another embodiment of the present application, a computer readable storage medium is also provided, the computer readable storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0014] According to still another embodiment of the present application, an electronic device is also provided, including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to perform the steps in any of the above method embodiments.

[0015] According to the present application, since a plurality of heating zones are arranged in the heating drying tunnel, and temperature and airflow speed are cooperatively and gradiently adjusted, the problem of low paint drying quality can be solved, and the effect of improving paint drying quality can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure diagram of a motor rotor paint surface automated drying device according to an embodiment of the present application; Figure 2It is a partial structure diagram of an automatic drying device for motor rotor paint surface according to an embodiment of the application; Figure 3 It is Figure 2 The partial structure is enlarged.

[0017] In the figure, 1, heating drying channel; 2, rack; 21, bearing seat; 211, V-shaped positioning groove; 22, driving sprocket; 23, longitudinal beam; 24, cross shaft; 25, driving motor; 26, transmission mechanism; 27, bearing seat; 281, hand wheel; 282, screw; 283, guide rod; 284, synchronous wheel; 285, adjusting seat; 3, preheating zone; 4, first drying zone; 5, second drying zone. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0019] 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 present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0020] In addition, in the present application, the orientation terms such as "up", "down", "left", "right" and the like can include but not limited to the orientation defined by the relative position of the components in the drawing. It should be understood that these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the position of the components in the drawing.

[0021] In the present application, unless otherwise 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 manner for signal transmission.

[0022] As used herein, "about", "approximately" or "approximately" includes the stated value and the average value within the acceptable deviation range of the specific value, wherein the acceptable deviation range is determined by the ordinary skill in the art considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e. the limitation of the measurement system).

[0023] In the present embodiment, as Figures 1-3As shown, an automatic drying device for motor rotor paint surface is provided, which is used for drying the paint surface of the 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 surface.

[0024] The conveying device comprises a rack 2 as a basic support, which in the 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.

[0025] 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 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.

[0026] 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 rack 2, and the cross shaft 24 is arranged perpendicular to the longitudinal beam 23, with both ends rotatably installed on the rack 2 through a bearing seat 27. The driving sprockets 22 of the two conveying chain assemblies are circumferentially fixedly arranged on the cross shaft 24 in an axially movable manner. The transmission mechanism 26 is a chain transmission or a belt transmission. 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 chain with the motor rotor on the bearing seat 21 to move in the conveying direction and smoothly pass through the heating drying channel 1.

[0027] The distance adjusting mechanism comprises a first adjusting mechanism and a second adjusting mechanism symmetrically arranged, respectively used for independently adjusting the transverse positions of the left and right conveying chain assemblies. The first and second adjusting mechanisms are identical in structure, each comprising two horizontally arranged lead screws 282, two nut sleeves (not shown in the figure) respectively threadedly engaged with the two lead screws 282, a driving part and a synchronous chain assembly. The two lead screws 282 are respectively rotatably mounted at the front and rear ends of the rack 2 in the conveying direction, i.e. the front end lead screw and the rear end lead screw; the nut sleeve is threadedly engaged with the lead screw 282 while being fixedly arranged in the longitudinal beam 23 of the conveying chain assembly to be adjusted; the driving part is a hand wheel 281 fixedly connected to the end of one of the lead screws 282; and the synchronous chain assembly comprises two synchronous wheels 284 fixedly arranged at 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 synchronously rotate, thereby ensuring that the longitudinal beam 23 can move in parallel without deflection.

[0028] The rack 2 is fixedly provided with adjusting seats 285 at the left and right sides of the front and rear ends, and the lead screws 282 of the first and second adjusting mechanisms at the same end of the rack 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 also fixedly arranged between the left and right adjusting seats 285 at the front and rear ends, and the two ends of the two longitudinal beams 23 are respectively slidably sleeved on the front and rear guide rods 283, which provide guidance for the transverse movement of the longitudinal beams 23.

[0029] The distance adjusting process of the conveying chain assembly is as follows: when it is necessary to adapt to motor rotors of different lengths, the operator can rotate the corresponding hand wheel 281 to drive the rotation of the lead screw 282 connected thereto, and accurately transmit the rotation to the lead screw 282 at the other end of the rack 2 through the synchronous chain assembly, so that the two lead screws 282 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 load bearing distance between the two conveying chain assemblies to adapt to motor rotors of different specifications.

[0030] The heating tunnel 1 is composed of an aluminum alloy profile frame assembled together, the frame is surrounded by a steel plate, two doors are arranged on each side of the frame, and infrared heating modules are arranged on the upper and lower layers of the frame, preferably EIR-950 infrared heating pipes, the heating wave band is far infrared wave band (peak wavelength is 3-10 μm), the electromagnetic wave energy of the 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, can cause resonance absorption effect, so that the heat energy is directly and efficiently transmitted 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, so as to enhance the reflection of the infrared radiation heat energy inside, forming a more uniform radiation field; adjustable opening size entrance and exit curtains are arranged at both ends of the heating tunnel 1, so as to reduce the convection exchange of the air inside and outside when the motor rotor enters and exits.

[0031] In order to improve the drying quality of the paint surface and avoid paint surface peeling, the drying area in the heating tunnel 1 is set to gradient drying, specifically, a preheating area 3, a first drying area 4 and a second drying area 5 are sequentially arranged in the conveying direction in the heating tunnel 1, wherein the preheating area 3 is located at the upstream of the heating tunnel 1, the first drying area 4 is located at the middle of the heating tunnel 1, and the second drying area 5 is located at the downstream of the heating tunnel 1.

[0032] The preheating area 3 is provided with a plurality of first heaters, a first air nozzle and a second air nozzle, the first heaters preheat the paint surface of the motor rotor, the first air nozzle is located above the conveying device and forms an impact airflow on the top surface of the motor rotor at an angle of 15-30° with the vertical direction, and 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 curved surface of the rotor to form uniform circumferential airflow; the airflow speed of the first air nozzle and the second air nozzle is preferably m / s; the motor rotor is conveyed to the first drying zone 4 after staying in the area for 5 minutes; under the cooperation of the first air nozzle and the second air nozzle, the solvent vapor saturated layer on the surface of the motor rotor can be blown away quickly, and the solvent inside the surface is driven to evaporate quickly, so that the surface layer is treated by rapid desolventization, and the mass transfer process is greatly intensified; it should be noted that most of the solvent on the surface is removed efficiently and gently, so that the 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 surface skin problem commonly seen in traditional processes.

[0033] 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 air flow speed of the third air nozzles arranged along the conveying direction gradually decreases, and the drying time of the motor rotor in this area is 11 minutes; in this area, the ambient temperature rises sharply to the highest, and the wind speed continues to decrease, at this time, the decrease of the wind speed reduces the convective heat dissipation, so that the radiant heat provided by the second heater can penetrate more efficiently into the inside of the surface, activate and drive the resin molecules in the inside of the surface to perform a violent cross-linking polymerization reaction, thereby the cured surface stably advances from the skin layer to the metal substrate in this area.

[0034] 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 air flow speed of the fourth air nozzle is less than the minimum air flow speed of the third air nozzle; the drying time of the motor rotor in this area is 4 minutes; in this area, the ambient temperature drops sharply, and the wind speed also decreases to a breeze state to realize a first annealing treatment on the formed surface, so that the internal stress generated in the inside of the surface due to chemical shrinkage and thermal expansion and contraction can be 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.

[0035] And to realize the adaptive control 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 obtain 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 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 the processor 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.

[0036] 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: S310: determining the automatic drying strategy corresponding to the motor rotor.

[0037] 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, 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).

[0038] The operator inputs the current batch of motor rotor parameter information on the control panel, including (but not limited to) motor rotor model parameters (such as: model YZR-250, size diameter 200mm, core length 300mm, material silicon steel sheet DW470) and paint material attribute parameters (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.

[0039] 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.

[0040] Exemplarily, for the combination of the above-mentioned YZR-250 rotor and Alkad678 paint, the strategy file loaded by the processor defines the speed of the conveying device as 0.5 meters / minute, and the corresponding target environment profile function is as follows: Preheating Zone 3 (corresponding to) (meters): The goal is to utilize the forced convection of high-speed airflow to efficiently remove a large amount of solvent from the paint surface without overheating it, thus preventing the surface from forming a skin too quickly; in this area, Set to medium constant temperature , Set to high constant airflow speed .

[0041] It should be noted that the solvent evaporation rate of the paint surface... (Unit: mol / (m²·s)) can be described by the following formula:

[0042] in, It is the mass transfer coefficient. It is the saturated vapor pressure of the solvent on the paint surface. It is the partial pressure of the solvent in the surrounding air. It is the ideal gas constant. It refers to the film temperature; high-speed airflow can greatly improve the mass transfer coefficient. , It is proportional to the Sherwood number (Sh) in fluid dynamics, and Sh is a function of the Reynolds number (Re) and the Schmidt number (Sc): ,because Therefore, increasing the airflow velocity v will significantly increase the Reynolds number Re, thereby... This increases exponentially; simultaneously, the high-speed airflow can quickly blow away the evaporated solvent, making... It remains close to zero, thus maintaining maximum evaporation driving force. The medium temperature (70°C) is achieved by moderately increasing the temperature without causing the paint surface to cross-link (skin) too quickly. .

[0043] First drying zone 4 (corresponding to) (meters): The goal is to activate and promote chemical cross-linking reactions within the paint surface; in this area, It is a parabola opening downwards, in Peak temperature reached at meters :

[0044] In the formula, The initial temperature, For temperature coefficient, These are the initial coordinates.

[0045] It is a linearly decreasing curve, from m / s decreased to m / s; The reduced wind speed here is to decrease convective heat loss and allow infrared radiation heat energy to penetrate the paint surface more effectively.

[0046] In the formula, Initial wind speed, The final wind speed, These are the coordinates of the endpoint.

[0047] Specifically, during this stage, the total heat flux density experienced by the motor rotor is... The sum of radiation and convection is:

[0048] in, It is the emissivity of the paint surface. It is the Stefan-Boltzmann constant. Convection heat transfer coefficient; wind speed The linear decrease in the convective heat transfer coefficient leads to the linear decrease in the convective heat transfer coefficient. (It is related to the Nusselt number Nu and the Reynolds number Re) and thus decreases. This causes the convective heat dissipation term to decrease. The effect was also reduced, while the radiative heat transfer term from the second heater was also reduced. This ensures that energy can efficiently penetrate into the paint surface and be used to activate chemical reactions, rather than being carried away by surface airflow.

[0049] Second drying zone 5 (corresponding to) (meters): After the first drying zone 4 is completed, considerable residual stress has accumulated inside the paint surface due to chemical shrinkage and the previous uneven thermal history. If directly exposed to room temperature, the huge temperature difference Additional thermal stress will be generated Its size can be approximated as:

[0050] in, It is the elastic modulus that changes with temperature. It is the coefficient of thermal expansion; due to the total stress Therefore, direct exposure to room temperature can easily cause the total stress to exceed the fracture strength of the paint surface, leading to cracking; thus, the function of this area is to provide controlled cooling and stress release for the basically cured paint surface; in this area, Set to low constant temperature , Set to low airflow speed This reduces the instantaneous and since at the beginning of the cooling the temperature of the paint surface is still higher than its glass transition temperature (Tg), the material is in a viscoelastic state, the elastic modulus is low, and by means of a low constant temperature and a low air speed it is possible to make the stress relaxation phenomenon significant, thus allowing the release of most of the residual stresses 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, in order to avoid the creation of micro-cracks.

[0051] Once the processor has loaded these function definitions, it will discretize them into specific setting values for each heater and air nozzle.

[0052] S320: based on the automated drying strategy, a thermal kinetic stratification profile is constructed and stably maintained.

[0053] Before the motor rotor enters the preheating zone 3, the processor first performs initialization and, according to the strategy file loaded in S310, issues initial operating parameter instructions to all the heaters and air nozzles, for example, for the heaters and air nozzles in the first drying zone 4, it is instructed to work cooperatively to achieve and maintain an ambient temperature of 80°C and an air flow speed of 2 m / s.

[0054] After the processor is started, it will continuously monitor the real-time data fed back by all the sensors; in the initial stage, the actual temperature and air speed profile will be different from the target profile, at this time the preset closed-loop control algorithm will adaptively adjust the power of each heater and the rotating speed of each air nozzle according to the deviation, until the difference between the actual value measured by all the 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 stratification profile, which, as can be easily understood, contains the aforementioned preheating zone 3, the first drying zone 4 and the second drying zone 5.

[0055] S330: the conveying device conveys the motor rotor, so that the motor rotor passes through the preheating zone 3, the first drying zone 4 and the second drying zone 5 in turn.

[0056] When the thermal kinetic stratification profile is stable, 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 undergoes drying treatment in the aforementioned three zones in turn.

[0057] S340: dynamic closed-loop control in the heating tunnel is performed.

[0058] In the embodiment, the processor polls all sensors at a high frequency to obtain the real-time state of the aforementioned profile in real time, and for each sensor node, the processor calculates the deviation of the measured value from the target value, and the deviation signals are input into a set of PID (proportional-integral-derivative) controllers to calculate the real-time adjustment amount of 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, so as to ensure that the thermal kinetic energy profile in the heating tunnel 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.

[0059] Specifically, the actual environmental temperature and the actual environmental airflow speed at a plurality of position points in the heating tunnel 1 are obtained. The actual environmental temperature and the actual environmental airflow speed are compared with the preset target environmental temperature and the target environmental airflow speed to obtain a deviation signal. Based on the deviation signal, the operating parameters of the heater and the air nozzle in the heating tunnel 1 are dynamically adjusted.

[0060] Thus, the embodiment achieves the following beneficial effects: 1. Fine control of the paint drying and curing process is achieved, and temperature and airflow speed are cooperatively and gradiently adjusted, so that process control moves from single dimension and static to multi-dimension and dynamic.

[0061] 2. Through regional and staged drying, defects such as air bubbles, pinholes, and cracking in the traditional process can be targetedly solved, and the yield and quality consistency of the cured paint surface are significantly improved.

[0062] 3. The actively constructed performance gradient (such as hard on the outside and tough on the inside) can endow the paint surface with more excellent comprehensive mechanical properties and environmental resistance, thereby improving the overall reliability of the motor product.

[0063] 4. By optimizing the energy delivery efficiency 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.

[0064] 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.

[0065] 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.

[0066] 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 one of the method embodiments when running.

[0067] In an example embodiment, the 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.

[0068] 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 one of the method embodiments.

[0069] In an example embodiment, the electronic device can further 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.

[0070] 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.

[0071] 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 unit, 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.

[0072] 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 distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0073] In addition, each functional unit in the various embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0074] 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 part that contributes 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, including a number of instructions to make a device (which can be a single chip, chip, etc.) or 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: U disk, mobile hard disk, read only memory (read only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk, and various program codes that can be stored in the medium.

[0075] 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.

2. The automatic drying device for motor rotor paint surface according to claim 1, characterized in that, 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 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 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 lateral positions of the two conveying chain assemblies, and each of the first adjusting mechanism and the second adjusting mechanism comprises: 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.

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

4. The automatic drying device for motor rotor paint surface according to claim 2, characterized in that, The air outlet direction of the second air nozzle is tangent to the circumferential surface of the motor rotor.

5. The automatic drying device for motor rotor paint surface according to claim 2, 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.

6. The automatic drying device for motor rotor paint surface according to claim 5, 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 less than the minimum air flow speed of the third air nozzles.

7. A control method for an automatic drying device for motor rotor paint finish, characterized by, The application is applied to any one of the motor rotor paint surface automatic drying devices in claims 1-6, 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 location 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.

8. The control method of the motor rotor paint surface automatic drying device according to claim 7, 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 location 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; dynamically adjusting operating parameters of the heater and the air nozzle in the heating baking tunnel based on the deviation signal.

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