Preform mouth visual inspection machine

The Bottle Mouth Inspection Machine utilizes advanced machine vision inspection technology to conduct fully automatic and non-contact online inspection of the deformation and damage of PET bottle mouths. The rated output is 48,000 bottles per hour. Suitable for PET/PE bottles.

Environmental Conditions

• Operating Altitude: 5–3000 meters above sea level

• Ambient Temperature Range: 5°C – 40°C

• Relative Humidity: 50% – 65% RH

• Factory Requirements: Floor levelness, load-bearing capacity, and related parameters must comply with national standards to ensure stable machine operation.

• Storage Requirements: Upon delivery, all components and equipment must be stored in accordance with national standards. During storage, proper lubrication and protective maintenance must be applied to prevent surface corrosion or deformation that may affect installation, commissioning, and operation.

Equipment Operating Requirements

• Noise Level: ≤85 dB (actual levels depend on container/package type, machine power, and site acoustics).

• Power Supply Connection: Between customer’s main electrical cabinet and the equipment’s cabinet.

• Main Power: 3 × 380V AC ±10%, 50 Hz, 3PH + N + PE

• Auxiliary Power (Lighting): 220V AC, 50 Hz, single-phase

• Note: Special voltages must be specified in advance, as they may affect specifications, delivery time, and cost.

• Total Power Consumption: Approx. 1.0 kW

• Control Voltage: 24 VDC

• Compressed Air Supply: 4–6 bar (air piping between source and main unit provided by customer).

Equipment Overview

• Equipment Name: Bottle Finish Inspection Machine

• Model: MT-PK021

• Quantity: One set

• Production Capacity: 48,000 bottles per hour

• Compatible Containers: PET / PE bottles

• Applicable Production Line: 48,000 bottles/hour PET/PE packaging line

• Installation Position: Within the blow molding machine—at the bottle discharge point from the mold or along the conveyor chain

• Primary Function: Performs online detection and rejection of PET/PE bottles with mouth deformation or damage on the top sealing surface.

4.2 System working principle and process

Figure 4: System working principle and flow chart

System Operating Principle and Process

1. As a bottle passes the positioning sensor, the sensor detects its presence and, via the control unit, records the bottle ID along with the current encoder value.

2. The positioning sensor simultaneously triggers the camera to capture an image of the bottle mouth. Once acquired, the image is processed by the image processor, and the results are sent to the human–machine interface for real-time display as well as to the control unit for preparation to reject bottles with defective mouths.

3. When the control unit receives a defect signal, it instructs the rejector to remove the bottle associated with the corresponding ID.

4.3 Image Acquisition Components

• Light Source: An LED area light source with a service life of up to 30,000 hours is employed. Using front illumination, it highlights the details of the inspected object clearly. In the captured image, the bottle mouth appears as a continuous bright ring. A manual-aperture fixed-focus lens is used. The focus ring is adjusted to ensure maximum clarity on the CCD sensor surface, while the aperture ring is adjusted to optimize image brightness.

• Camera: An area-array CCD analog camera is used, offering a resolution of 640 × 480 pixels and capable of capturing up to 60 frames per second.

4.4 Bottle mouth detection module:

image processing process

4.5 Test Content and Accuracy:

4.5.1 Test Content

A. Through-hole

B. Internal chip

C. External chip

D. Point chip

E. Deformed bottle neck (oval)

4.5.2 Detection Accuracy