Surface coating device for cooling fins of servo motor

Abstract

The invention is suitable for the field of servo motor accessory processing equipment, and provides a surface coating device for a servo motor cooling fin, which comprises a rack, a feeding positioning module, a coating compensation module, a coating recovery module, a temperature control module, a vacuum defoaming module, a material adaptation module, a thickness detection module and a moving-out module are sequentially arranged on the rack in the cooling fin conveying direction; the feeding positioning module comprises a belt conveyor, an adjustable rubber positioning block and a limiting air cylinder, the coating compensation module comprises a cross beam, a main / auxiliary coating head, a micro adjusting air cylinder and an infrared sensor, and all the modules realize signal linkage through a PLC (Programmable Logic Controller); the problems of feeding deviation, corner coating missing, coating waste, high bubble rate and poor material adaptation of an existing device are solved, the positioning error of the cooling fins is smaller than or equal to + / -0.05 mm, the corner coating missing rate is reduced to 0, the coating utilization rate is larger than or equal to 80%, the coating adhesive force is larger than or equal to 8.5 MPa, the high-precision cooling requirement of the servo motor is met, and the device is suitable for batch production.

Description

Technical Field

[0001] This invention belongs to the field of servo motor component processing equipment, and particularly relates to a surface coating device for servo motor heat sinks. Background Technology

[0002] While existing servo motor heatsink coating devices can complete basic coating, the following key technical challenges remain in actual transmission and processing, making it difficult to meet the high-precision requirements of servo motors in terms of coating quality and production efficiency:

[0003] The feeding drive lacks precise positioning, and the coating reference is offset: Traditional conveyor belts rely solely on friction to transport materials, and the heat sink is prone to lateral displacement (the displacement can reach 1-2mm), resulting in misalignment between the coating head and the heat sink. The deviation rate of planar coating reaches 8-10%, and blind spots are more likely to occur in subsequent corner coating.

[0004] The coating transmission lacks compensation action, resulting in severe coating omissions at the edges and corners: The edges and corners of the heat sink (especially the folded edges) are weak areas for coating. When the main coating head moves in a straight line, it cannot cover the edges and corners, resulting in a 5-8% omission rate. The heat dissipation efficiency of the thin coating area is 20% lower than that of the flat surface, and it is prone to premature failure due to corrosion.

[0005] The coating transmission system lacks a recycling design, resulting in a high waste rate: during the coating process, 40-60% of the coating detaches from the heat sink due to dripping and overflowing, and is directly discarded—consuming an extra 20-30L of coating per 10,000 heat sinks, which not only increases raw material costs but also requires additional waste coating disposal, polluting the environment;

[0006] Without a defoaming mechanism after coating, the coating performance is poor: air in the coating or air bubbles entrained during coating form voids as the coating cures. Traditional devices do not have a dedicated defoaming mechanism, resulting in a bubble rate of 3-5%, which leads to a 10-15% reduction in the overall heat dissipation efficiency of the heat sink.

[0007] Material compatibility without linkage transmission, large fluctuations in adhesion: The surface characteristics of aluminum alloy (light, pressure ≤10N) and copper (heavy, pressure ≥20N) heat sinks are different, but traditional devices use the same viscosity coating for transmission, resulting in the adhesion of aluminum alloy coatings being only 6-7MPa and copper coatings only 7-8MPa, both lower than the ideal value (≥8.5MPa).

[0008] Therefore, a surface coating device for servo motor heat sinks is needed to solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to provide a surface coating device for a servo motor heat sink to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A surface coating device for servo motor heat sinks includes a frame. Along the heat sink conveying direction, the frame is sequentially equipped with a feeding and positioning module, a coating compensation module, a coating recovery module, a temperature control module, a vacuum defoaming module, a material matching module, a thickness detection module, and a removal module. Each module is linked by a PLC controller to form a closed-loop processing flow of "conveyance-coating-processing-detection-removal". The frame is constructed of aluminum profiles, with a length of 2200-3000mm, a width of 800mm, and a height of 1300mm. It has four adjustable feet at the bottom (adjustment range 0-50mm). The modules are arranged according to the "processing sequence" to ensure that the heat sink can be processed without secondary transfer. The closed-loop linkage allows for real-time correction of processing parameters. The frame size is adaptable to the workshop layout, and the adjustable feet solve the problem of device tilting caused by uneven ground, ensuring stable conveying.

[0012] The feeding and positioning module includes a belt conveyor, adjustable rubber positioning blocks, and a limit cylinder. The belt conveyor is horizontally installed on the left side of the middle layer of the frame, with a width of 600mm. The conveying speed can be adjusted by a PLC controller (range 50-120mm / s), and the surface is covered with anti-slip rubber pads. The adjustable rubber positioning blocks are movably connected to the frame on both sides of the belt conveyor via slide rails, and the spacing can be adjusted by adjusting bolts (suitable for heat sinks with a width of 50-200mm). The limit cylinder is fixed on the frame crossbeam at the end of the belt conveyor, with a stroke of 30mm and an air pressure of 0.5MPa. The anti-slip rubber pads prevent the heat sink from slipping during conveying, the adjustable positioning blocks are suitable for heat sinks of different sizes, and the limit cylinder achieves longitudinal positioning before coating. The three components work together to solve the problems of "lateral offset and lack of reference" in traditional conveyor belts, laying the foundation for coating accuracy.

[0013] A further technical solution includes a coating compensation module comprising a crossbeam, a main coating head, an auxiliary coating head, a micro-adjusting cylinder, and an infrared sensor. The crossbeam is horizontally fixed at the top of the frame and directly above the feeding and positioning module, with a length of 800mm. The main coating head is slidably connected to the crossbeam via a slider and is raised and lowered by an electric push rod (stroke 50mm). The auxiliary coating heads are symmetrically arranged on both sides of the main coating head. One end of the micro-adjusting cylinder is connected to the main coating head, and the other end is connected to the auxiliary coating head (stroke 15mm, response speed ≤0.1s). The infrared sensor is installed at the bottom of the main coating head, with a detection frequency of 0.05 times / s. The infrared sensor captures the corner positions in real time, and the micro-adjusting cylinder dynamically adjusts the spacing of the auxiliary coating heads, solving the problem that the main coating head's "linear movement cannot cover the corners." The main coating head's lifting function is adaptable to heat sinks of different thicknesses (such as 5mm aluminum alloy and 8mm copper sheets), ensuring consistent coating height.

[0014] A further technical solution involves a paint recycling module comprising a receiving tray, a 500-mesh filter, and a reflux pump. The receiving tray, measuring 600mm × 300mm × 50mm, is positioned in the middle layer of the frame directly below the conveyor belt, with an anti-stick coating on its inner wall. The 500-mesh filter is laid flat inside the receiving tray. The reflux pump is installed on the right side of the frame, with its inlet end connected to the bottom of the receiving tray via a liquid delivery pipe, and its outlet end connected to an external paint tank via a return pipe, with a flow rate of 0.2-1mL / s. The receiving tray collects dripping paint, the anti-stick coating reduces residue, the 500-mesh filter removes impurities larger than 20μm (such as metal fragments), and the reflux pump returns the pure paint to the paint tank, solving the waste and environmental problems of "direct paint disposal" in traditional devices.

[0015] A further technical solution involves a temperature control module comprising a heating element and a PT100 sensor. The heating element, made of silicone rubber (500W), is embedded between the coating area and the vacuum defoaming area in the middle layer of the frame, with a coverage area matching the width of the conveyor belt. The PT100 sensor is installed adjacent to the heating element, with a temperature detection accuracy of ±0.1℃, and is electrically connected to the PLC controller. A temperature control range of 25-30℃ ensures that the coating maintains stable fluidity (avoiding low-temperature clumping and high-temperature volatilization). The PT100 sensor provides real-time temperature feedback, and the PLC dynamically adjusts the heating power to mitigate the impact of ambient temperature fluctuations on coating quality.

[0016] A further technical solution involves a vacuum defoaming module comprising a vacuum suction cup, a vacuum pump, a lifting bracket, and a stepper motor. The stepper motor is mounted on the top crossbeam of the frame. One end of the lifting bracket is connected to the output of the stepper motor, and the other end is connected to the vacuum suction cup (stroke 0-40mm). The vacuum suction cup has a diameter of 50mm, with a high-temperature resistant sealing gasket on its surface and a heating element (85W, 50W). The vacuum pump is fixed on the right side of the frame and connected to the vacuum suction cup via an air pipe, with a pumping rate of 1-3L / min and a vacuum degree of -0.07MPa. The stepper motor drives the suction cup to precisely adhere to the coating, the vacuum pump uses negative pressure to remove air bubbles, and the heating element maintains the fluidity of the coating to assist in defoaming. The three components work together to solve the problems of "numerous coating bubbles and low heat dissipation efficiency" in traditional devices.

[0017] A further technical solution involves a material adaptation module comprising a pressure sensor and a viscosity regulator. The pressure sensor is attached to the frame on the surface of the conveyor belt, located near the discharge end of the feeding and positioning module, with a range of 0-5N and a detection accuracy of ±0.01N. The viscosity regulator is connected in series in the supply pipe between the paint tank and the coating head, with an adjustment range of 500-2000 mPa·s, and is electrically connected to the PLC controller. The pressure sensor distinguishes materials by weight (≤1N for aluminum alloy, ≥2N for copper), and the PLC-linked viscosity regulator adapts to the surface characteristics of different materials, solving the problem of "large fluctuations in adhesion when the same viscosity paint is applied to different materials" in traditional devices.

[0018] A further technical solution involves a thickness detection module comprising a camera and a PLC controller. The camera is a 20-megapixel industrial camera, mounted on the top of the frame near the discharge end of the vacuum defoaming module, with the lens pointing vertically downwards at the conveyor belt, and a shooting frequency of 0.1 times / s. The PLC controller has a built-in image algorithm and is electrically connected to the camera. The camera captures images of the coating, and the PLC calculates the thickness using the algorithm. If the deviation exceeds ±0.03mm, the coating parameters (flow rate, speed) are adjusted in real time to form a closed-loop control, solving the problem of "no coating thickness detection and low accuracy" in traditional devices.

[0019] A further technical solution includes a robotic arm and a placement platform. The robotic arm is mounted on the right side of the frame, near the discharge end of the thickness detection module, with a working radius of 300mm and a flexible gripper at the end. The placement platform measures 500mm × 300mm and has a 5mm rubber pad on its surface, which is compatible with the working range of the robotic arm. The flexible gripper prevents scratching the heat sink, and the rubber pad cushions the impact of stacking. The robotic arm replaces manual removal, solving the problems of low efficiency and easy bumping associated with traditional manual handling.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The present invention provides a feeding and positioning effect: the transmission process is "heat sink is placed on the conveyor belt → adjustable rubber positioning block is laterally guided → limit cylinder is longitudinally positioned", which makes the heat sink positioning error ≤ ±0.05mm, which is 90% lower than the offset rate (1-2mm) of the traditional non-positioning device, and the planar coating deviation rate is reduced from 8-10% to <0.5%, ensuring the accuracy of the coating reference.

[0022] This invention provides a coating compensation effect: the transmission process is "infrared sensor detects corner spacing → PLC controls micro-adjusting cylinder to adjust auxiliary coating head position → main / auxiliary coating heads apply coating synchronously", which reduces the corner missing coating rate from 5-8% to 0, the thin coating rate from 10% to 0, and improves the overall heat dissipation efficiency of the heat sink by 15-20%, avoiding corner corrosion failure.

[0023] This invention achieves the following coating recycling effect: the transmission process is "dripping coating falls into the receiving tray → 500-mesh filter cotton filters impurities → return to the coating tank by the return pump", which increases the coating utilization rate from 40% to ≥80%, reduces coating consumption by 20-30L per 10,000 heat sinks, reduces raw material costs by 40-50%, and reduces the amount of waste coating to be disposed of, making it more environmentally friendly;

[0024] This invention achieves the following vacuum degassing effect: The transmission process is "stepper motor drives the lifting bracket to descend → vacuum suction cup adheres to the coating → vacuum pump removes air and bubbles", which reduces the coating bubble rate from 3-5% to <0.3% and narrows the heat dissipation efficiency fluctuation of the heat sink from ±15% to ±2%, meeting the high-precision heat dissipation requirements of the servo motor.

[0025] The material compatibility of this invention is as follows: the transmission process is "pressure sensor detects heat sink pressure → PLC determines material → viscosity regulator adjusts coating viscosity", which makes the coating adhesion of aluminum alloy and copper heat sinks ≥8.5MPa, and the adhesion fluctuation is narrowed from ±1.5MPa to ±0.3MPa, significantly improving compatibility.

[0026] The present invention achieves the following removal effect: the transmission process is "the robotic arm flexibly grips the coated heat sink → moves it to the placement platform for stacking", which reduces the scratch rate of the heat sink from 15% to ≤0.1% and the collision rate from 8% to 0, with a removal efficiency of 2s / s, which is 5 times higher than manual handling.

[0027] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0028] Figure 1 This is a system block diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the paint recycling process of the present invention;

[0031] Figure 4 This is a schematic diagram of the heat sink transmission path of the present invention;

[0032] Figure 5 This is a schematic diagram of the vacuum defoaming process of the present invention.

[0033] In the diagram: 1. Frame; 2. Feeding and positioning module; 3. Coating compensation module; 4. Coating recovery module; 5. Temperature control module; 6. Removal module; 8. Vacuum defoaming module; 9. Material adaptation module; 10. Thickness detection module; 21. Conveyor belt; 22. Adjustable rubber positioning block; 23. Limit cylinder; 31. Crossbeam; 32. Main coating head; 34. Auxiliary coating head; 35. Infrared sensor; 36. Miniature adjusting cylinder; 41. Receiving tray; 42. 500-mesh filter cotton; 43. Return pump; 51. Heating element; 52. PT100 sensor; 61. Robotic arm; 62. Placement platform; 81. Vacuum suction cup; 82. Vacuum pump; 83. Lifting bracket; 84. Stepper motor; 91. Pressure sensor; 92. Viscosity regulator; 101. Camera; 102. PLC controller. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0036] Example 1: Basic Optimized Version (including feeding and positioning module 2 + coating compensation module 3 + paint recycling module 4);

[0037] like Figures 1-5 As shown, this embodiment of the invention provides a surface coating device for a servo motor heat sink, comprising:

[0038] Frame 1: Constructed with aluminum profiles, 2200mm long × 800mm wide × 1300mm high, with adjustable feet at the bottom (0-50mm).

[0039] Feeding and positioning module 2: The belt conveyor 21 is horizontally installed on the left side of the middle layer of the frame 1, and adjustable rubber positioning blocks 22 are installed on both sides via slide rails. Limiting cylinders 23 are installed on the crossbeam of the end frame 1.

[0040] Coating compensation module 3: The crossbeam 31 is horizontally fixed on the top of the frame 1. The main coating head 32 is slidably connected to the crossbeam 31 through a slider. The auxiliary coating heads 34 on both sides are connected to the main coating head 32 through a micro-adjustment cylinder 36. An infrared sensor 35 is installed at the bottom of the main coating head 32.

[0041] Paint recycling module 4: The receiving tray 41 is installed in the middle layer of the frame 1 directly below the belt conveyor 21, with 500-mesh filter cotton 42 inside, and a return pump 43 installed on the outer frame 1. The feeding end is connected to the receiving tray 41, and the discharging end is connected to the paint tank.

[0042] Temperature control module 5: Heating element 51 is embedded near the middle coating area of ​​frame 1, and PT100 sensor 52 is installed adjacent to it;

[0043] Remove module 6: The robotic arm 61 is installed near the discharge end of the thickness detection module 10 on the right side of the frame 1, and the placement table 62 is located within the working range of the robotic arm 61;

[0044] Thickness detection module 10: PLC controller 102 (S7-200) is installed in the control box on the left side of the frame 1, and is electrically connected to the feeding and positioning module 2 and the coating compensation module 3. A 5-inch touch screen is installed on the front of the control box.

[0045] In this embodiment: Preparation: Pour the ceramic-based coating (initial viscosity 1000 mPa·s) into the coating tank. Set the parameters on the touch screen: belt conveyor (21) speed 100 mm / s, main coating head (32) flow rate 1 mL / s, auxiliary coating head 34 flow rate 0.3 mL / s, heating element 51 temperature 28℃; Feeding and positioning: Place a 100×50×5mm aluminum alloy heat sink (weight 67.5g, pressure ≈0.675N) on the belt conveyor 21. Adjustable rubber positioning blocks 22 guide the heat sink (spacing adjusted to 100mm). After the heat sink is transferred to the coating area, the limiting cylinder 23 extends to position it, and the belt conveyor 21 stops. Coating compensation: Infrared sensor 35 detects a distance of 3mm between the corner and the main coating head 32. PLC controls micro-adjustment cylinder 36 to extend 2mm, and the distance of auxiliary coating head 34 is adjusted to 1.5mm. Electric push rod drives coating head down to a height of 5mm, electromagnetic flow valve opens, belt conveyor 21 restarts, and main / auxiliary coating heads coat synchronously. Coating recovery: Dripped coating falls into receiving tray 41, is filtered by 500-mesh filter cotton 42, and then sent back to coating tank by return pump 43 (flow rate 0.5mL / s). Temperature control and removal: Heating element 51 maintains 28℃. After coating, heat sink is transferred to removal area, and robotic arm 61 picks up heat sink and moves it to placement platform 62.

[0046] The heat sink undergoes a complete process of "positioning block guidance - cylinder positioning - compensation coating - paint recycling - robotic arm removal," with each module linked by a PLC. The "guiding + positioning" of the feeding positioning module 2 ensures that the offset of the heat sink is ≤ ±0.04mm. The "detection + adjustment" of the coating compensation module 3 ensures that there is no missed coating at the edges and corners. The "collection + recirculation" of the paint recycling module 4 ensures that the paint utilization rate reaches 82%. The single cycle processing time is 12s, 300 pieces are processed per hour, the coating thickness deviation is ±0.02mm, and the adhesion of the aluminum alloy coating is 8.5MPa, which is a 60% improvement in overall performance compared to traditional devices.

[0047] Example 2: Full-featured optimized version (adds 8 vacuum defoaming modules + 9 material adaptation modules + 10 thickness detection modules);

[0048] The difference between this embodiment and embodiment 1 is that: the vacuum defoaming module 8: the stepper motor 84 is mounted on the top crossbeam of the frame 1, one end of the lifting bracket 83 is connected to the stepper motor 84 and the other end is connected to the vacuum suction cup 81, the surface of the vacuum suction cup 81 is attached with a heating plate 85, and the vacuum pump 82 is mounted on the right side of the frame 1 and connected to the vacuum suction cup 81 through an air pipe.

[0049] Material adaptation module 9: Pressure sensor 91 is attached to the frame 1 on the surface of belt conveyor 21 (near the discharge end of feeding positioning module 2), and viscosity regulator 92 is connected in series on the pipe between paint tank and coating head, both of which are electrically connected to PLC controller 102.

[0050] Thickness detection module 10: A 20-megapixel camera 101 is mounted near the discharge end of the vacuum degassing module 8 at the top of the frame 1 and is electrically connected to the PLC controller 102.

[0051] In this embodiment: Preparation: Pour in ceramic-based coating, select "copper material" mode on the touchscreen, and the PLC automatically sets: viscosity 1500 mPa·s, vacuum pump 82 pumping time 3s, main coating head 32 flow rate 1.2 mL / s; Material identification: Place a 100×50×5mm copper heat sink (weight 222.5g, pressure ≈ 2.225N) on the conveyor belt 21. After the pressure sensor 91 detects the pressure, the PLC controls the viscosity adjuster 92 to adjust the coating viscosity to 1500 mPa·s; Coating and recycling: Same as in embodiment 1, main / The auxiliary coating head applies coating synchronously, and the coating recovery module 4 continuously recovers the coating; Vacuum degassing: The heat sink is transferred to the degassing area, the stepper motor 84 drives the lifting bracket 83 to descend, and the vacuum suction cup 81 adheres to the coating surface; The vacuum pump 82 (pumping rate 2L / min) starts pumping air for 3 seconds, and the heating element 85 maintains 28°C; Thickness detection: The camera 101 captures the coating image, the PLC calculates the thickness to be 0.15mm (standard 0.15±0.02mm), and after it is deemed qualified, it is transferred to the temperature control area; Temperature control and removal: Same as in Example 1, the placement table 62 stacks 5 pieces and then an audible and visual alarm is triggered;

[0052] The system adds a "material identification-vacuum defoaming-thickness detection" step. Pressure sensor 91 triggers viscosity adjustment, and suction cup bonding and vacuum pump extraction are performed simultaneously, with the camera detecting the thickness in real time. The "detection-viscosity adjustment" of material matching module 9 enables the copper coating adhesion to reach 8.8MPa, the "bonding-evacuation" of vacuum defoaming module 8 reduces the bubble rate to 0.2%, and the "shooting-adjustment" of thickness detection module 10 reduces the coating thickness deviation to ±0.015mm. The single-cycle processing time is 15s, processing 240 pieces per hour with a pass rate of 99.9%, meeting the production requirements of high-precision servo motor heat sinks.

[0053] Example 3: Dual-station optimized version (dual coating area + synchronous transmission);

[0054] The difference between this embodiment and embodiment 2 is as follows: Frame 1: The length is increased to 3000mm, and two independent coating compensation modules 3 (500mm spacing) and two paint recovery modules 4 are set along the belt conveyor 21; Vacuum defoaming module 8: The number of vacuum suction cups 81 is increased to 4 (2 sets of dual-stations) for synchronous air extraction; Feeding and positioning module 2: A diversion cylinder is added (mounted on the front frame 1 of the belt conveyor 21), which can alternately transport heat sinks to two coating areas; Removal module 6: A diversion guide rail is added (mounted on the front frame 1 of the placement table 62) to remove the finished product in two ways.

[0055] In this embodiment: Preparation: The touchscreen selects the "dual-station" mode and sets the parameters for two coating areas: belt conveyor 21 speed 120mm / s, main coating head 32 flow rate 1mL / s; Dual-station feeding: The diversion cylinder alternately transfers the heat sink to coating area 1 and coating area 2, and two sets of coating compensation modules 3 start coating simultaneously; Synchronous recovery and defoaming: Two sets of paint recovery modules 4 collect and return the paint simultaneously, and the four vacuum suction cups 81 of the vacuum defoaming module 8 simultaneously defoam the two coated heat sinks; Dual-path removal: The qualified heat sinks are transferred to the removal area in two paths via the diversion guide rail, and two sets of robotic arms 61 simultaneously grip and move them to the corresponding placement platform 62;

[0056] Mass production is achieved through "parallel processing in dual coating areas - synchronous processing at dual defoaming stations - dual-path removal"; the "alternating feeding - synchronous coating - synchronous defoaming" of the dual stations increases the hourly processing capacity to 450 pieces (an 87.5% increase compared to Example 2); the coating utilization rate is 85%, the bubble rate is 0.3%, the thickness deviation is ±0.02mm, and the unit production cost is reduced by 30%, making it suitable for mass production scenarios of servo motor heat sinks.

[0057] Working principle and usage process of this invention:

[0058] Using PLC controller 102 as the core, the entire process is automated through "signal triggering - mechanism action - feedback adjustment", which is divided into 6 stages:

[0059] Phase 1: Preparation before coating (signal initialization);

[0060] The operator pours the paint into the external paint tank and inputs parameters (belt speed 21, coating head flow rate, heating element temperature 51, etc.) to the PLC controller 102 via the touch screen.

[0061] PLC controller 102 synchronizes parameters to feeding and positioning module 2, coating compensation module 3, etc., starts the agitator in the paint tank (speed 100rpm), reflux pump 43 enters standby state, PT100 sensor 52 starts temperature detection, and heating element 51 preheats to the target temperature (25-30℃).

[0062] Phase 2: Feeding and positioning (baseline establishment);

[0063] The operator places the heat sink on the conveyor belt 21. The pressure sensor 91 detects the pressure on the heat sink and sends a signal to the PLC controller 102. The PLC controls the viscosity regulator 92 to adjust the viscosity of the coating according to the pressure value (≤1N for aluminum alloy, ≥2N for copper).

[0064] The belt conveyor 21 drives the heat sink to be conveyed, and the adjustable rubber positioning blocks 22 guide it from both sides, with the lateral offset controlled within ≤±0.05mm;

[0065] The photoelectric sensor (mounted on the frame 1) under the belt conveyor 21 detects the heat sink and sends a signal to the PLC controller 102. After a 1-second delay, the PLC controls the belt conveyor 21 to stop and simultaneously controls the limit cylinder 23 to extend and press against the front end of the heat sink to complete the longitudinal positioning.

[0066] The magnetic switch of the limit cylinder 23 sends a "positioning in place" signal to the PLC controller 102, and the PLC triggers the coating compensation module 3 to start.

[0067] Phase 3: Coating Compensation (Precision Coating);

[0068] Infrared sensor 35 is activated to detect the distance between the corner of the heat sink and the main coating head 32 in real time. If the distance is greater than 2mm, a signal is sent to PLC controller 102. PLC controls micro-adjusting cylinder 36 to extend and retract, adjusting the position of auxiliary coating head 34 until the distance is 1-1.5mm.

[0069] The PLC controller 102 controls the electric push rod to drive the main coating head 32 to descend. After it descends to the target height (5mm for aluminum alloy and 8mm for copper), the limit switch of the electric push rod sends a "position" signal.

[0070] The PLC controller 102 controls the opening of the electromagnetic flow valves of the main / auxiliary coating heads, and at the same time restarts the belt conveyor 21. The heat sink moves with the belt conveyor 21, the main coating head 32 coats the flat surface, and the auxiliary coating head 34 coats the edges and corners.

[0071] During the coating process, the infrared sensor 35 continuously detects the corner position. If the spacing change is greater than ±0.02mm, it is fed back to the PLC controller 102 in real time. The PLC dynamically adjusts the micro-adjustment cylinder 36 to ensure coating accuracy.

[0072] Phase 4: Paint recycling and vacuum defoaming (quality optimization);

[0073] During the coating process, the dripping paint falls into the receiving tray 41 and is temporarily stored after impurities are filtered by the 500-mesh filter cotton 42. When the liquid level in the receiving tray 41 is ≥50mL, the liquid level sensor installed in the receiving tray 41 sends a signal to the PLC controller 102. The PLC starts the return pump 43 to send the filtered paint back to the paint tank.

[0074] The viscosity sensor inside the paint tank detects the viscosity of the recycled paint. If the deviation is > ±50 mPa·s, a signal is sent to the PLC controller 102. The PLC controls the viscosity regulator 92 to add solvent or concentrated paint until the viscosity is qualified.

[0075] After coating, the heat sink is transferred to the vacuum degassing area. The PLC controller 102 controls the stepper motor 84 to drive the lifting bracket 83 to descend, and the vacuum suction cup 81 adheres to the coating surface. After the pressure sensor of the vacuum suction cup 81 sends a "adhesion in place" signal, the PLC starts the vacuum pump 82 to pump the aluminum alloy for 1 second and the copper for 3 seconds, while controlling the heating element 85 to maintain 25-30℃.

[0076] After the evacuation is completed, the PLC controller 102 controls the vacuum pump 82 to stop, the stepper motor 84 drives the lifting bracket 83 to rise, and the heat sink continues to transfer to the thickness detection area.

[0077] Phase 5: Thickness detection and temperature control (precision closed loop);

[0078] The heat sink is transferred to the thickness detection area. The PLC controller 102 controls the camera 101 to capture the coating image and calculates the thickness using a built-in algorithm. If the thickness deviation is ≤ ±0.03mm, the PLC controls the belt conveyor 21 to transfer the heat sink to the temperature control area. If the deviation is > ±0.03mm, the PLC automatically adjusts the coating parameters of the next heat sink (coating flow rate ±0.1mL / s or belt conveyor 21 speed ±10mm / s).

[0079] The heating element 51 of the temperature control module 5 maintains the temperature of the coating area at 25-30℃. After the heat sink stays in the temperature control area for 5 seconds (to ensure that the coating is initially cured), it is transferred to the removal area.

[0080] Phase 6: Finished product removal (safe output);

[0081] The heat sink is transferred to the removal area. The PLC controller 102 controls the robotic arm 61 to start, and the flexible gripper picks up the heat sink and moves it to the placement table 62 for stacking.

[0082] The infrared sensor on the placement table 62 (mounted on the side of the placement table 62) detects the number of stacked pieces. When 5 pieces are stacked, a signal is sent to the PLC controller 102, which triggers an audible and visual alarm to remind the operator to collect the pieces.

[0083] After the robotic arm 61 completes its removal and resets, it waits for the next heat sink before entering the next processing cycle.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface coating apparatus for a servo motor heat sink, comprising a frame (1), characterized in that: The frame (1) is sequentially equipped with a feeding positioning module (2), a coating compensation module (3), a coating recovery module (4), a temperature control module (5), a vacuum defoaming module (8), a material matching module (9), a thickness detection module (10), and a removal module (6) along the heat sink conveying direction. The feeding and positioning module (2) includes a belt conveyor (21), an adjustable rubber positioning block (22), and a limiting cylinder (23). The belt conveyor (21) is horizontally mounted on the frame (1). The adjustable rubber positioning block (22) is symmetrically and movably connected to both sides of the belt conveyor (21). The limiting cylinder (23) is fixed on the frame (1) at the end of the belt conveyor (21).

2. The surface coating device for a servo motor heat sink according to claim 1, characterized in that: The coating compensation module (3) includes a crossbeam (31), a main coating head (32), an auxiliary coating head (34), a micro-adjusting cylinder (36), and an infrared sensor (35). The crossbeam (31) is horizontally fixed above the frame (1). The main coating head (32) is slidably connected to the crossbeam (31) and can be raised and lowered along the crossbeam (31). The auxiliary coating head (34) is symmetrically arranged on both sides of the main coating head (32). One end of the micro-adjusting cylinder (36) is connected to the main coating head (32), and the other end is connected to the auxiliary coating head (34). The infrared sensor (35) is installed on the main coating head (32).

3. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The paint recycling module (4) includes a receiving tray (41), a 500-mesh filter cotton (42), and a reflux pump (43). The receiving tray (41) is located directly below the belt conveyor (21) and connected to the frame (1). The 500-mesh filter cotton (42) is laid inside the receiving tray (41). The feed end of the reflux pump (43) is connected to the receiving tray (41), and the discharge end is connected to the external paint tank.

4. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The temperature control module (5) includes a heating element (51) and a PT100 sensor (52). The heating element (51) is mounted on the frame (1) and located near the coating area. The PT100 sensor (52) is arranged adjacent to the heating element (51). The heating temperature range of the heating element (51) is 25-30℃. The temperature detection accuracy of the PT100 sensor (52) is ±0.1℃.

5. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The vacuum defoaming module (8) includes a vacuum suction cup (81), a vacuum pump (82), a lifting bracket (83), and a stepper motor (84). The stepper motor (84) is mounted on the top of the frame (1). One end of the lifting bracket (83) is connected to the stepper motor (84), and the other end is connected to the vacuum suction cup (81). The vacuum suction cup (81) is located above the coated heat sink. The vacuum pump (82) is connected to the vacuum suction cup (81) through a pipe.

6. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The material adaptation module (9) includes a pressure sensor (91) and a viscosity regulator (92). The pressure sensor (91) is mounted on the frame (1) and located near the discharge end of the feeding positioning module (2). The viscosity regulator (92) is connected in series with the paint supply pipeline. Both the pressure sensor (91) and the viscosity regulator (92) are electrically connected to the PLC controller (102) in the thickness detection module (10).

7. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The thickness detection module (10) includes a camera (101) and a PLC controller (102). The camera (101) is mounted on the frame (1) and located above the heat sink after coating. The PLC controller (102) is electrically connected to the camera (101). The PLC controller (102) is also electrically connected to the feeding positioning module (2), the coating compensation module (3), and the temperature control module (5), respectively.

8. The surface coating apparatus for a servo motor heat sink according to claim 1, characterized in that: The removal module (6) includes a robotic arm (61) and a placement table (62). The robotic arm (61) is mounted on the frame (1) and located near the discharge end of the thickness detection module (10). The placement table (62) is set within the working range of the robotic arm (61). The robotic arm (61) is electrically connected to the PLC controller (102).

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