How to reduce the production error of injection molding robots?

Publisher:思为客
Release Date:2024.10.30

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Injection molding manipulator from the perspective of maintaining long-term operation,there are some important operating conditions to always be aware of,this will reduce downtime and reduce costs,here are a few things to pay attention to.


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01

Guide rails and bearings


Guides and bearings at all shafts should be kept clean and well lubricated:

1. If the robot operates in a dusty environment, the guide rails need to be cleaned frequently.

2. If you find any metal fragments or powder, it may indicate poor lubrication.

3. Most manipulators have automated lubrication systems and parts that need to be replaced regularly.



02

Robot cycle time


One of the key points in keeping a robot working well is to simply observe and listen. Doing so can reveal a lot about the overall operation of the robot:

1. The manipulator works through specific movements, so listen for any abnormal sounds, such as whistling, clicking, etc., which indicate that the bearing cannot rotate normally or that some other component is stuck.

2. When the link part of the manipulator moves along the guide rail equipped with power cables and vacuum hoses, it will make a normal ticking sound, but the sound is smooth and stable.

3. Check any observable bearings to make sure they are rotating smoothly. Simply checking and listening for signs of wear or adjustments can go a long way toward keeping your robot operating optimally.



03

Drive system


If the manipulator is driven by an assembly frame-transmission gear, pay attention to whether there is any hesitation or shaking during operation. All movement other than smooth and smooth motion can indicate damage to the drive system or some foreign object lodged inside:

1. Push and drag the movable arm: When the manipulator pushes downward, a quick way to check the movement or backlash between the assembly beam and the transmission gear is to push and drag the movable arm to feel the abnormal movement (different back and forth movements). However, since normal manufacturer tolerances are very precise, this test method will be very inaccurate.

2. Adjust the backlash: If you suspect that there may be a problem with the assembly beam and transmission gear, a better way is to use a long-range magnetic meter base. After adjusting the backlash according to the manufacturer's instructions, check the entire stroke of the shaft to make sure there is no tightness between the assembly beam and the transmission gear.

3. Replace components at the same time: If the tooth gap cannot be adjusted, the assembly frame and transmission gear may be worn and need to be replaced. If the assembly frame and drive gear must be repaired, it is best to replace both components to ensure long-term performance.

4. Check the conveyor belt: As for the shaft driven by the conveyor belt, pay close attention to the debris dropped by the conveyor belt as well as the damage to itself. Inspect the pulleys carefully and watch for signs of dust originating from the belt material.

5. Avoid directional deviation: Ensure that the conveyor belt, transmission pulleys and sheaves are completely aligned. A deviated conveyor belt will wear out very quickly. As long as it is a conveyor belt-driven system, you can check the preload of the conveyor belt itself according to the manufacturer's instructions.



04

Pneumatic system


Including multi-axis servo drives, almost all manipulators have pneumatic functions as long as they have wrist rotation and vacuum grasping actions:

1. No automatic dehumidification system is configured: Pay close attention to the suction cup of the filter pressure regulator unit. If there is water in it, it means that the humidity of the compressed air source passing through the system is too high. The presence of even a small amount of moisture can be transmitted to pneumatic valves and actuators, causing oxidation and internal contamination, which may ultimately cause the pressure regulator to stick or the actuator to intermittently stick or fail.

2. Automatic dehumidification system configured: Contamination or discoloration on the suction cup also indicates that moisture is increasing before it is removed. If water collects in the suction cup, even for a short period of time, it can enter the system and cause the problems mentioned above. If you notice any physical damage to the pneumatic hose, the system may have a leak.

3. Determine air pressure leaks: If the air pressure circuit is filled with air at normal operating pressure, and a leak occurs somewhere in the circuit, then you should be more likely to detect an obvious hissing sound, which will help you determine the location of the leak.



05

Check molding equipment


Standard manipulators are usually installed on the formwork of the molding equipment. When equipment operates quickly, vibrations from the molding equipment may be transmitted to the robot and can cause damage. Simply observing the operation of the molding equipment to ensure that the mold movement is adjusted to a reasonable state and reducing the number of shaking or vibrations can extend the life of the robot. In high-speed operation, the vibration frequency may be very high. It is best to install the manipulator on a support structure independent of the molding equipment.



06

Pay attention to wiring wear


When checking the surface of the robot, if black particles or powder are found, it means that the circuit wiring of the robot has signs of wear. Make sure wiring ties are secure and cables are properly installed. If you don't see these signs of wear, you can also take a closer look at all power, transformer, or encoder cables, inside and outside the wiring paths, because during the production cycle, there is continuous friction on the wiring of the robot, or the wiring connected to the cable rail. lines will eventually wear out and fail.





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