A fully automatic capsule filling machine is designed to separate, fill, lock, and discharge hard capsules through a series of automated stations. During operation, capsules from the hopper enter the feeding mechanism individually, move into the capsule sorting and positioning system, and are then separated into cap and body sections by the vacuum system. The machine subsequently completes pellet filling, defective-capsule rejection, module movement, capsule locking, and finished-capsule discharge through a sequence of operating stations.
The machine typically uses variable-frequency stepless speed control. When the filling capacity needs to be changed, the dosing disc can be replaced, while different tooling sets can be used to accommodate 0–4 hard capsules.
Routine Cleaning and Maintenance
When the capsule filling machine operates continuously for an extended period, components that come into direct contact with pharmaceutical materials should be cleaned regularly. These components should also be thoroughly cleaned when changing product batches or when the machine has been out of service for an extended period.
The transmission mechanism beneath the working table should be lubricated regularly with an appropriate amount of lubricant to reduce friction and wear on moving components.
The main transmission gearbox should be inspected monthly to check the lubricant level. Replenish the lubricant when necessary and generally replace the gearbox oil every six months.
The indexing gearbox of the rotary table should be serviced according to operating hours. A common maintenance reference is to replace the lubricant after approximately 3,000 operating hours, using an appropriate gear oil such as No. 90 oil when specified by the equipment manufacturer.
Safety Clutch Inspection
The safety clutch protects the machine against overload. Under normal operating conditions, the clutch should remain engaged without slipping.
After extended use, the safety clutch may begin to slip even under normal loads. When this occurs, the round nut can be adjusted appropriately to restore normal transmission. Any adjustment should be carried out carefully according to the machine manufacturer's specifications to avoid excessive tightening or damage to the clutch mechanism.
Vacuum Separator Maintenance
The vacuum separator is a critical component in the capsule filling process. It uses vacuum suction to position the capsule in the upper and lower modules and separate the capsule cap from the body. If the cap and body cannot be separated correctly, subsequent filling operations cannot proceed normally.
During operation, the rotary table advances one station at a time while the main shaft completes one rotation. The vacuum separator moves up and down once under cam control during each cycle.
If capsule separation becomes unstable, inspect the clearance between the upper surface of the vacuum separator and the lower surface of the lower module. Excessive clearance may prevent the vacuum system from reaching the vacuum level required for proper cap-body separation. Insufficient clearance may cause mechanical interference and potentially deform the lower module.
The vacuum-system filter should also be cleaned regularly to remove accumulated dust and material residues. Maintaining a clean filter helps preserve sufficient vacuum capacity and stable capsule separation.
Drive Chain Maintenance
The drive chain should generally be inspected once a week and lubricated with an appropriate amount of grease. Chain tension should also be checked regularly.
When the chain becomes excessively loose, adjust the tensioning mechanism as required. However, the chain should not be opened or deliberately removed from the sprocket during adjustment, as this may disturb the timing relationship between different mechanical mechanisms and result in motion interference.
Maintaining the correct chain tension helps ensure stable transmission and synchronized operation of the capsule filling machine.
Inspection of Transmission Cams
The capsule filling machine contains multiple transmission cams responsible for coordinating different operating stations. A typical configuration includes five main cam groups:
- Stations 1 and 2: cams for capsule feeding and distribution.
- Stations 1 and 2: cams controlling the vacuum separator for capsule cap-body separation.
- Station 6: cam for rejecting capsules that have not been properly separated.
- Station 8: cam for locking the filled capsules.
- Station 9: cam for ejecting the finished capsules.
These cams work together with the main transmission system to maintain the correct sequence and timing of each operation. During maintenance, abnormal wear, surface damage, looseness, or incorrect timing should be checked. Any significant change in cam position or transmission timing may affect capsule separation, filling, locking, or discharge.
Importance of Precision Mechanical Components
The operating stability of a fully automatic capsule filling machine depends not only on the control system but also on the dimensional accuracy and reliability of its transmission and positioning components. Parts such as shafts, bushings, cam components, guide parts, rollers, support components, and other mating parts may require controlled tolerances and consistent surface finishes.
Hansheng Automation can manufacture custom precision components for capsule filling machines according to customer drawings or 3D models. We support made-to-drawing machining for non-standard pharmaceutical machinery parts, including prototype and small-batch production. Based on the application requirements, we can select suitable materials, machining processes, tolerances, heat treatments, and surface finishes to meet specific assembly and operating requirements.
Regular lubrication, cleaning, vacuum-system inspection, chain adjustment, and transmission-cam inspection can help maintain the machine's operating accuracy and reduce unexpected downtime. For components showing excessive wear or damage, timely replacement or precision remanufacturing is recommended to maintain stable machine performance.
