Shilong Machinery’s Daily Sharing: Core Working Principle of Fully Automatic Servo Capping Machine

Shilong Machinery Daily Sharing: Core Working Principle of Fully Automatic Servo Screw Capping Machine

一、Core Working Principle of Fully Automatic Servo Screw Capping Machine

The complete machine consists of four continuous working procedures: bottle conveying & separating, automatic cap feeding, servo torque screw capping, inspection & discharging. Its core is closed-loop torque control via servo motor, which precisely controls the screw tightening force.

1. Bottle Feeding & Positioning Procedure

Bottles filled with liquid are conveyed at a constant speed by a stainless steel conveyor belt.

A screw bottle separator or star wheel evenly spaces bottles to ensure each bottle occupies an independent station.

V-shaped pneumatic clamps on both sides fasten the bottle body and lock the bottle tightly, preventing the bottle from rotating or slipping during capping.

Photoelectric sensors detect the presence of bottles in real time. When no bottle is detected, interlock protection is triggered to stop cap dropping and avoid cap waste.

2. Automatic Cap Sorting & Cap Dropping Procedure

Caps are poured into a vibrating cap unscrambler. Vibration and screening mechanisms automatically distinguish the front and back sides of caps and reject reversed caps.

Qualified caps are transported along a slide rail to the cap dropping station above bottle mouths.

Cylinders control the cap baffle. The baffle opens upon receiving the bottle detection signal, dropping one cap accurately onto each bottle mouth to complete automatic cap feeding.

3. Core Servo Screw Tightening Procedure (The Most Critical Mechanism of the Machine)

Cap Gripping & Positioning

The capping head descends, and three silicone jaws clamp the outer wall of the cap. The silicone material is anti-slip and will not scratch printed patterns on caps.

Closed-Loop Servo Torque Control

A servo motor matched with a precision planetary reducer drives the jaws to rotate. The motor is equipped with a torque encoder to feedback real-time rotating torque.

Operators set the standard tightening torque on the touch screen in advance. The machine continuously compares real-time torque with the preset value during capping.

Precise Stop & Reset

The servo motor stops rotating instantly once the torque reaches the preset value. The jaws release the cap, and the capping head rises and resets.

Different from traditional pneumatic capping machines that rely on rotation time to judge tightness, servo machines take torque as the stop standard, completely eliminating thread slipping, cracked caps and inconsistent tightness.

Overload Protection

If caps are stuck or threads are misaligned, torque will instantly exceed the threshold. The machine stops immediately with audible and visual alarms to protect bottles, caps and the servo motor.

4. Inspection & Discharging Procedure

After capping, bottles pass through photoelectric detectors, which identify defective products including missing caps, loose caps and unqualified tightening torque.

An optional rejecting mechanism automatically diverts defective products out of the production line, while qualified bottles continue conveying to subsequent working procedures (aluminum foil sealing, labeling).

The whole set of actions runs in continuous cycles with zero manual intervention throughout production.

Product Catalogue List

Filling machine, laundry detergent filling machine, lubricant filling machine, liquid filling machine, fully automatic filling machine, body wash filling machine

Company Profile: Guangzhou Shilong Machinery Equipment Co., Ltd.

Guangzhou Shilong Machinery Equipment Co., Ltd. is a professional packaging machinery manufacturer integrating research, design, development and manufacturing. We commit ourselves to introducing advanced domestic and foreign technologies and integrating superior resources. With sophisticated equipment, rich industry experience and professional after-sales service, we provide customized packaging equipment solutions for global clients.

Our production lines feature high efficiency, and we own a complete industrial system covering R&D, manufacturing, sales and after-sales service. We specialize in the R&D and manufacturing of packaging machinery equipment, including bottle washing machines, screw capping machines, labeling machines, sleeve labeling machines, sealing machines, emulsifiers / mixing tanks, water treatment equipment, as well as customized full-automatic & semi-automatic filling production lines for food and packaging industries.

We adhere to the tenet of prioritizing product quality, valuing business reputation and delivering thoughtful service. We strive to provide personalized equipment products and all-round technical & after-sales services for all customers.