Liquid filling and capping machines are mainly used for quantitative filling, inner plug insertion, cap placement, and capping of liquid and moderately viscous materials. They are commonly used in cosmetics, daily chemicals, pharmaceuticals, pesticides, and other industries. Since different bottles, caps, materials, and production speeds require different mechanical configurations, the equipment often involves a high degree of customization.
For non-standard mechanical components used in filling, positioning, clamping, and capping mechanisms, we can provide precision machining based on customer drawings and actual operating requirements, supporting the production of customized components for different filling lines.
1. Working Principle of Liquid Filling and Capping Machines
The machine completes the packaging process through the coordinated operation of conveying, filling, cap sorting, cap placement, pressing, and capping mechanisms.
During cap feeding, bottle caps are first placed into the lower hopper and then continuously conveyed to the cap-sorting area by a variable-frequency lifting mechanism. The vibrating plate sorts and orients the caps so that they enter the guide chute in a consistent direction before being delivered to the cap placement head.
During the capping process, two sets of synchronized belts stabilize and convey the bottles, while three groups of six capping wheels progressively tighten and roll the caps into position. A mechanical torque adjustment mechanism controls the capping force, helping maintain proper contact between the cap and bottle neck and reducing the risk of insufficient or excessive tightening.
2. Main Working Process
1. Empty Bottle Sorting and Positioning
Scattered empty bottles first enter the rotary bottle separator. The separator organizes the bottles and feeds them onto the conveyor at a preset spacing. A chuck or positioning mechanism then accurately stops each bottle beneath the filling head.
Different bottle diameters and shapes require different positioning components. We can manufacture non-standard positioning chucks, clamping blocks, and related components according to customer drawings, using CNC turning, milling, and other precision machining processes to control critical dimensions and ensure proper assembly.
2. Quantitative Liquid Filling
After the bottle is positioned, the filling system starts operating. A magnetic-drive pump transfers the liquid into the bottle, while preset filling parameters determine the amount of liquid dispensed into each container.
Once the preset filling volume is reached, the filling operation stops. The chuck releases the filled bottle and positions the next empty bottle for filling, allowing continuous operation.
For liquids with different viscosities and flow characteristics, the dimensions and sealing structures of the filling components may also vary. Therefore, filling heads, connectors, pump-related components, and other parts may need to be manufactured according to the specific application.
3. Inner Plug Insertion
After filling, the bottles are conveyed to the sealing station. A mechanical arm picks up the inner plug and presses it accurately into the bottle neck to create an initial seal.
During plug insertion, the pressing head and positioning mechanism need to maintain proper coaxial alignment. Excessive dimensional deviation or assembly clearance may affect the insertion position of the plug.
Hansheng Automation can manufacture precision components such as plug pressing heads, positioning sleeves, and connecting shafts according to customer drawings, providing dimensionally consistent parts for equipment assembly.
4. Automatic Cap Placement
The filled and plugged bottle continues to the cap placement section. The cap-sorting mechanism uses a vibrating plate to orient the caps, and correctly oriented caps enter the guide chute before reaching the cap placement head.
The cap placement head positions each cap accurately onto the bottle neck, preparing it for the subsequent capping operation. For caps with different diameters, structures, or materials, the guide components, clamping parts, and mounting brackets may also require corresponding adjustments.
5. Cap Pressing and Capping
After the cap enters the capping section, the cap hammer presses it downward to ensure stable contact with the bottle neck. The capping wheels then roll and secure the cap, forming a reliable connection between the cap and bottle.
The capping force is controlled through a mechanical torque adjustment mechanism. During actual production, the capping parameters need to be adjusted according to the cap material, bottle-neck structure, and sealing requirements to avoid loose caps, deformation, or inadequate sealing.
If components such as capping mechanism shafts, bushings, roller shafts, or mounting plates require replacement or redesign, we can provide custom machining based on 2D or 3D customer drawings, taking into account material, tolerance, and surface-treatment requirements.
3. Key Mechanical Components
Liquid filling and capping machines contain multiple continuously moving mechanisms. Their operating accuracy depends not only on the control system but also on the machining quality of the mechanical components.
Common precision-machined components include:
- Positioning chucks and clamping blocks: Used to secure bottles and maintain consistent positioning dimensions.
- Filling heads and connectors: Used for liquid transfer and filling, requiring appropriate dimensional and sealing performance.
- Plug pressing heads and positioning sleeves: Used for inner plug insertion and requiring suitable dimensional matching and coaxiality.
- Cap placement heads and guide components: Used to position and guide caps according to different cap specifications.
- Capping wheels and roller shafts: Used for cap rolling and fixation, requiring stable rotation and accurate installation.
- Clamping belts, transmission shafts, and bushings: Used for conveying and clamping and selected according to continuous operating conditions.
For these components, we can provide precision machining for individual parts, small batches, or larger production runs according to customer drawings. Depending on the component structure, we can select suitable processes such as CNC turning, CNC milling, and precision grinding.
For components requiring wear resistance or corrosion resistance, material selection and surface treatment can also be considered according to the actual operating environment.
4. Applications and Operating Characteristics
Liquid filling and capping machines are not limited to conventional liquid products. Depending on the material and bottle configuration, they can also be used for small-volume liquid products such as injections, disinfectants, oral liquids, essential oils, and cod liver oil.
Different products have different requirements for filling accuracy, bottle positioning, sealing methods, and capping force. As a result, many mechanical components used in these machines have non-standard designs.
Hansheng Automation supports precision machining based on customer drawings and specific application requirements, enabling customized components to be manufactured for filling, conveying, positioning, and capping mechanisms.
5. Precision Machining and Component Support
During long-term operation, positioning components, shafts, bushings, rollers, and clamping components are continuously exposed to friction, impact, and repetitive motion. Their dimensional accuracy, coaxiality, surface roughness, and material selection can directly affect the stability of the mechanism.
We can evaluate customer drawings based on critical dimensions, tolerances, hole-and-shaft fits, and surface-treatment requirements. For replacement or optimized non-standard components, we can also consider the actual installation dimensions and operating conditions to provide customized machining.
This approach allows us to manufacture precision mechanical components that meet the assembly and operating requirements of liquid filling, conveying, positioning, and capping systems.
