How to solve the problem when the discharging speed of the container bag packaging scale slows down?

In the industrial packaging process, the smoothness of material discharge from the container bag packaging scale (ton bag scale) directly affects the operational efficiency of the entire production line. When operators notice that the packaging scale experiences delayed discharge or poor material flow, this is usually a sign that the operating parameters of the equipment, the physical properties of the materials, or the condition of the mechanical components have changed.
In this situation, we can adopt a step-by-step approach, conducting multi-dimensional inspections and adjustments from the material status to the mechanical components, in order to restore the efficient operation of the equipment.
I. Influence and Adjustment of Material Characteristics
Often, the slowdown in material processing is not due to damage to the equipment itself, but rather a change in the physical state of the materials.
1. Changes in material humidity and viscosity: If the powder or granular material to be packaged has recently been exposed to moisture, or has a high viscosity, it is very likely to form a "bridging" phenomenon near the discharge port (that is, the material gets blocked at the outlet and forms an arch-like structure), resulting in a disruption or slowdown of the discharge process.
• Countermeasures: Check the storage environment of the materials and, if necessary, install additional dehumidification equipment. If the process permits, consider appropriately adjusting the moisture content of the materials. Additionally, adding an appropriate amount of anti-caking flow-assisting air cushions or vibration devices in the discharge channel of the packaging scale can effectively improve the fluidity of the materials.
2. Particle size and gas content: Fine powder materials are prone to clogging due to static electricity adsorption or poor air permeability; while powder materials containing a large amount of air will experience "gas resistance" during discharge.
• Countermeasures: Optimize the dust removal system to ensure the normal operation of the negative pressure environment; or add an exhaust process before feeding to remove the excess gases in the materials.
II. Inspection of Mechanical Components' Conditions
The mechanical components inside the packaging scale may experience wear or displacement over a long period of operation, which can affect the feeding speed.
1. Discharge port and flexible connection: Has the size of the discharge port decreased due to deformation? Are the flexible connections at the connection points (such as rubber tubes or canvas bags) thinner, wrinkled, or even partially collapsed and blocked the passage due to long-term friction?
• Response strategy: After the machine stops, manually check the smoothness of the discharge port, remove the scale or remaining materials adhering to the inner wall. Inspect and straighten the flexible connections, and replace the severely worn flexible components if necessary to ensure that the material passage is wide and unobstructed.
2. Performance of the breaking arch device: Many packaging scales are equipped with pneumatic arch-breaking devices or mechanical mixers to break potential blockages when the materials are at rest.
• Response strategy: Observe the working condition of the breaking ram device, check if the air pressure meets the standard, and verify if the striking frequency is appropriate. Ensure that the breaking ram is in close contact with the material and can effectively achieve the loosening effect.
III. Optimization of Control System Parameters
Automated packaging scales are usually equipped with advanced control systems, and the setting of parameters directly affects the feeding speed.
Feed screw rotation speed: Setting the rotation speed of the screw conveyor too low to control the discharge is the direct cause of slow material output.
• Countermeasures: While ensuring the accuracy of packaging and the stability of weighing, try to moderately increase the speed setting of the screw motor. Pay close attention to the feedback from the weighing instrument to avoid excessive instantaneous flow rate due to rapid speed increase and material clogging.
2. Switching point for fast and slow feeding: Packaging scales usually adopt a dual-speed control mode of "fast feeding + slow feeding". If the end threshold (switching point) for fast feeding is set improperly, it will cause the equipment to remain in a low-speed operation state for a long time.
• Countermeasures: Re-calibrate the weighing sensor and adjust the parameters of the control instrument according to the material characteristics. Try to slightly advance the end point of rapid feeding, allowing the equipment to run at high speed for a longer period of time, thereby improving the overall feeding efficiency.
IV. Maintenance of the Pneumatic System
For packaging scales that use pneumatic actuators (such as pneumatic gate valves and butterfly valves), the cleanliness of the air source and the stability of the air pressure are of utmost importance.
• Response strategy: Check the working condition of the air compressor and ensure that the air path triad (filter, pressure reducing valve, oil mist generator) is operating normally. Regularly drain the condensate water from the filter and add lubricating oil to the cylinder to prevent the valves from being stuck and unable to fully open, thereby ensuring the smooth passage of materials.
Through the above systematic investigation from the inside out and from soft to hard, it is usually possible to pinpoint the specific cause of the slowdown in the discharge of the bag packaging scale. In actual production, it is recommended to establish a regular equipment inspection and parameter recording mechanism to promptly detect abnormalities and carry out preventive maintenance, ensuring the long-term stable operation of the production line.