The heating plate is a core component of household appliances such as rice cookers, induction cookers, electric kettles and air fryers, as well as industrial heating equipment. Its dispensing process directly affects the thermal conductivity, sealing performance and service life of products. With consumption upgrading and the popularization of smart home devices, the market has raised increasingly stringent requirements for the quality of heating plates. Uniform glue lines and strong adhesion are required, along with high consistency during mass production.

The vision tracking dispenser integrates machine vision recognition, automatic control and precision mechanical transmission technologies. It is a high-precision intelligent dispensing equipment specially developed to tackle pain points in traditional dispensing processes, including inaccurate positioning, diversified product shapes, frequent model changeovers and high reliance on manual labor. Its core technology adopts a CCD vision system to rapidly identify and precisely locate randomly placed products on assembly lines, obtain target position coordinates in real time and dynamically adjust dispensing paths, enabling high-precision dispensing during movement. The equipment implements synchronous compensation for positioning and dispensing trajectories while workpieces are continuously conveyed, effectively eliminating positioning errors caused by workpiece displacement or conveyor belt movement.

Tailored to the special process requirements of the heating plate industry, this solution provides a one-stop intelligent solution covering vision positioning, dynamic tracking, height compensation and precision dispensing.

The heating plate industry has long been confronted with the following core pain points in the traditional dispensing process:

• Insufficient positioning accuracy: Traditional dispensing relies on manual product placement or positioning via mechanical fixtures. Deviations in product position directly affect the precision of dispensing paths, easily resulting in glue offset, missing dispensing or glue overflow. There is a lack of high-precision automatic recognition and positioning means after products reach the dispensing station.

• Diversified product forms: Heating plates come in various shapes (round, square and special-shaped). In addition, products within the same batch may have minor dimensional differences. Traditional teach programming methods can hardly quickly adapt to frequent model change requirements.

• Difficulty in height variation compensation: The surfaces of heating plates may have unevenness or height differences. Conventional dispensing equipment cannot automatically detect height variations, leading to inconsistent glue thickness. For the heat dissipation modules of electronic products, uneven glue coating or glue thickness deviation exceeding 0.1 mm may trigger sharp local temperature rises, which further reduce the service life of related components.

• High reliance on manual labor: Traditional processes involve numerous manual operations including product loading and machine adjustment. This not only leads to low efficiency, but also tends to cause problems such as improper dispensing volume and missing dispensing due to human error.

• Poor surface cleanliness: Contaminants such as grease, dust or mold release agent residues generated during processing on heating plate surfaces will form a weak boundary layer, greatly weakening the intermolecular interaction force between glue and heating plates. During dispensing, dust barriers will prevent tight bonding between glue and heating plates.

• High hidden costs: Due to low accuracy of traditional dispensing, glue overflow and missing dispensing occur frequently. This not only causes glue waste, but also increases costs for subsequent cleaning procedures.

• Inadequate thermal conductivity: Uneven glue layers lead to uneven heat transfer. Induction cookers and other equipment may suffer local overheating or uneven heating during operation, impairing cooking performance and shortening the service life of heating plates.

The technical difficulties of the glue dispensing process for heating plates mainly lie in the following aspects:

1. Challenges in Adaptability to Multiple Shapes and Sizes There is a wide variety of heating plate products, including geometric shapes such as circular, square and special-shaped ones, and products of different models vary greatly in dimensions. Conventional glue dispensers require dispensing paths to be set one by one through teach programming, resulting in long line changeover time and low efficiency.

2. Challenges in Consistency of Glue Thickness Caused by Differences in Surface Height The surface of a heating plate is not perfectly flat, and subtle height differences may exist in different areas of the same heating plate. Traditional glue dispensers cannot detect variations along the Z-axis, leading to inconsistent glue thickness. Excessive glue in some areas causes overflow and waste, while insufficient glue in other areas impairs heat conduction performance.

3. Challenges of Dynamic Positioning in Continuous Assembly Line Operation Under the assembly line production mode, workpieces keep moving continuously. The conventional static glue dispensing method requires the production line to stop for positioning, which severely reduces production efficiency. Achieving precise positioning and accurate glue dispensing while workpieces are moving is a core difficulty in the automated production of heating plates.

4. Challenges in Process Control Arising from Adhesive Properties Thermally conductive adhesives, sealants and other glues commonly used for heating plate dispensing have strict requirements on temperature, viscosity and glue output volume. Low temperature will cause stringing and slow glue flow, while excessively high temperature will degrade adhesive performance. Due to the fluid characteristics of glues, manual dispensing tends to suffer from uneven glue output, glue overflow and incomplete sealing. The thickness of the glue layer must be precisely controlled within a specific range: an overly thin layer weakens heat conduction, whereas an overly thick layer increases thermal resistance.

5. Challenges Related to Adhesion and Surface Pretreatment If contaminants such as grease and dust remain on the heating plate surface, the adhesive cannot spread and wet sufficiently to form close molecular contact, resulting in reduced adhesion. Differences in compatibility between various heating plate materials and adhesives also exert a direct impact on bonding performance.

Vision Positioning System – Accurate Identification & Automatic Deviation Correction

Equipped with high-resolution industrial cameras, the system automatically identifies contour features and dispensing areas of heating plates via image processing technology. After products arrive at the dispensing station, CCD camera shooting is adopted for positioning, and robots are guided to target positions by vision without precise mechanical positioning. The system can store dispensing parameters for various heating plates, which can be called with one click during production changeover.

• Automatic Product Type Identification: The system stores dispensing parameters for hundreds of product types, cutting changeover time down to minutes.
• Real-time Position Deviation Correction: Continuously monitors product positions during dispensing and corrects deviations instantly once detected.
• System Precision: Vision positioning accuracy reaches ±0.01mm.

Vision Following Dynamic Tracking Technology – Non-stop Assembly Line Operation

Different from traditional static shooting and fixed-point dispensing, the vision-following dispenser adopts dynamic tracking technology. Products are conveyed continuously on the assembly line; the vision system tracks product positions in real time, and the dispensing head moves synchronously to complete dispensing.

• Non-stop Assembly Line: No production halt for waiting, enabling continuous manufacturing.
• No Product Fixtures Required: Products can be directly placed on the conveyor belt, eliminating fixture manufacturing costs and model change time.
• In-line Operation: Integrates product dispensing and handling processes, compatible with multiple production lines.

Infrared Laser Height Measurement System – Comprehensive 3D Spatial Compensation

To address possible height variations on heating plate surfaces, this solution can be equipped with a high-precision automatic laser height measurement system. On the basis of standard vision positioning, the added infrared height measurement function allows the dispensing system to correct not only X-Y axis deviations but also accurately calculate compensable Z-axis height, realizing comprehensive compensation in three-dimensional space.

• Real-time Height Measurement: Scans heating plate surfaces before dispensing to acquire height data.
• Automatic Z-axis Compensation: Dynamically adjusts the height of the dispensing head based on measurement results to guarantee consistent glue thickness across areas of different heights.
• Glue Thickness Control: Glue thickness deviation is controlled within 0.1mm.

Precision Dispensing & Temperature Control System – Guarantee Adhesive Performance

Thermally conductive adhesives, sealants and other materials commonly used for heating plate dispensing impose strict requirements on dispensing accuracy and temperature regulation.

• Precision Screw Valve: Servo motor-driven eccentric screw feeding delivers continuous and stable adhesive output, suitable for dispensing adhesives with viscosity ranging from 0 to 500,000 CPS.
• Dispensing Consistency Accuracy: Up to ±2%.
• Precise Displacement Control: Displacement can be accurate to 0.05ml/r.
• Back-suction Anti-dripping Function: Adjustable back suction prevents post-dripping, achieves clean adhesive cutoff and avoids stringing.
• Heating Function: Optional adhesive heating and base plate heating devices ensure adhesives work under optimal temperature conditions.

Self-developed Software System – User-friendly & Enabling Flexible Production

• Visual Programming: Pattern-based teaching with what-you-see-is-what-you-get effect.
• Multi-axis Motion Coordination: Supports 3-axis linkage, 4-axis linkage, dual-platform configuration and more.
• Adjustable Parameters: Glue volume, dispensing speed, dispensing duration and glue stopping time can all be flexibly configured.
• Large-capacity Storage: Stores dispensing parameters for hundreds of products to enable rapid switching.

Advantage Dimensions of Vision-Following Dispensing Machine

Comparison Table: Traditional Process vs. Vision-Following Dispensing

Q1: What should I do if positioning is inaccurate during glue dispensing on heating plates?

A: The vision-following glue dispenser automatically identifies product positions and performs real-time deviation correction via a CCD vision system. After products reach the glue dispensing position, the CCD takes photos for positioning, and the vision system guides the dispensing head to the precise position without the need for precision fixtures. The positioning accuracy can reach ±0.01 mm.

Q2: Will uneven surfaces of heating plates affect the glue dispensing effect?

A: An optional infrared laser automatic height measurement system is available for this solution. The system detects height variations on heating plate surfaces in real time and automatically compensates the Z-axis height during glue dispensing, ensuring consistent glue thickness across areas of different heights with glue thickness deviation controlled within 0.1 mm.

Q3: How long does it take to switch production for heating plates of different models?

A: The system can store glue dispensing parameters for hundreds of products. Parameters can be called with one click during production changeover without reprogramming or fixture replacement. The changeover time is shortened from the traditional 30–60 minutes to 3–5 minutes.

Q4: What types of heating plates are suitable for the vision-following glue dispenser?

A: It applies to heating plates of various shapes including round, square and special-shaped ones, heating plates for home appliances such as rice cookers, induction cookers, air fryers and electric kettles, as well as heating plates for industrial heating equipment.

Q5: Will stringing or dripping occur during glue dispensing?

A: The equipment is equipped with an adjustable suction back function to effectively prevent post-dripping of glue. Meanwhile, the precision screw valve is driven by a servo motor to realize continuous and stable glue output. Combined with precise control over glue output speed and duration, glue stringing and dripping can be effectively avoided.

Q6: Is the equipment complicated to operate? Does it require professional operators?

A: The equipment adopts visual programming with graphic teaching to achieve what-you-see-is-what-you-get operation. Operators do not need professional programming skills and can get started after simple training. Parameters such as glue volume, glue output speed, dispensing duration and glue stop duration can be flexibly set on the interface.

Q7: Is surface treatment required for heating plates before glue dispensing?

A: It is recommended to clean heating plate surfaces prior to glue dispensing. If contaminants such as grease, dust or release agent exist on the surfaces, the glue cannot be tightly bonded to the heating plates, which may lead to glue peeling off. Surface pretreatment with a plasma cleaner can effectively improve dispensing adhesion. Test data shows that the dispensing adhesion of plasma-treated heating plates can be increased by 87.5%.

Q8: Can the vision-following glue dispenser connect to existing production lines?

A: Yes. The equipment is available in cabinet-type and embedded designs to adapt to multiple existing production lines. Featuring compact structure and high automation, it can connect to existing belt conveyor lines. Cabinet-type model: It is an independent workstation that can be moved and placed freely. It supports fixed-point dispensing and follow-up dispensing with fully automatic operation without manual work or matching fixtures. Embedded model: It can be directly embedded into existing assembly lines. No modification is needed for running production lines. It can be put into production after being delivered to corresponding stations and commissioned, realizing zero-cost production changeover smoothly.

Q9: What types of glue can be dispensed with this equipment?

A: The equipment is compatible with a wide range of glues, including thermal conductive adhesive, silicone, epoxy resin, UV adhesive, AB adhesive, thermal interface adhesive and more. The precision screw valve suits glues with viscosity ranging from 0 to 500,000 CPS.

Q10: What is the return on investment of the vision-following glue dispenser?

A: The equipment significantly cuts comprehensive operating costs by reducing labor costs (fully automatic operation greatly cuts manual material placement and machine adjustment work), lowering glue consumption (precision metering avoids glue overflow and waste) and decreasing defective rates (defect rate can be reduced below 0.2%). Meanwhile, non-stop assembly line operation greatly boosts production capacity, and the return on investment cycle generally ranges from 6 to 12 months.