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Maintenance items of injection molding machine manipulator

2021-06-28

From the perspective of long-time work of the injection molding machine manipulator, paying attention to some major work conditions will reduce downtime and reduce costs. Pay attention to the following points in the maintenance requirements of the injection molding machine manipulator: Rubber injection molding machine automation


1. Guide rails and bearings


The cleaning of guide rails and bearings at all shafts and outstanding lubrication should be adhered to. Assuming that the manipulator is working in a dusty environment, it is often necessary to clean up the guide rails. If you find any metal fragments or powder, it might indicate poor lubrication. In order to ensure proper lubrication, it is very important to have a proper linear guide system. Most manipulators have automated lubrication systems and parts that need to be replaced regularly.


2. Manipulator cycle cycle


One of the keys to insisting on the outstanding work of the manipulator of the injection molding machine is simple inquiry and listening, which can reveal a lot of information about the overall work of the manipulator. The manipulator works through specific actions, so it listens to any abnormal sounds, such as howling, clicks, etc., which indicate that the bearing cannot rotate normally or that some other component is stuck. The manipulator connects and moves along the rails equipped with power cables and vacuum hoses, which will announce a normal ticking sound, but this sound is smooth and stable. Check any bearings that can be queried to ensure that they rotate smoothly. Just checking and listening for signs of wear or adjustments can greatly help maintain the best working condition of the manipulator.




3. Drive system


Assuming that the manipulator is driven by the device frame-transmission gear, pay attention to whether there is any hesitation or shaking during the work process. Except for smooth and lubricated movements, all movements can indicate damage to the drive system or some foreign objects stored inside. Injection manipulators are no better than stamping manipulators. When pushing downwards, the method to quickly check the movement or backlash between the device beam and the transmission gear is to push and drag the moving arm to feel abnormal movement (the back and forth movement is not the same). However, because the tolerance accuracy of normal manufacturers is very high, this test method will be very inaccurate. Suppose you suspect that there may be doubts about the device beam and the transmission gear, a better way is to use a long-range magnetic stand. After adjusting the backlash according to the manufacturer's instructions, check the full stroke of the shaft to ensure that there is no tightness between the device beam and the transmission gear. Assuming that the backlash cannot be adjusted, the device frame and transmission gear may wear out and need to be replaced. Assuming that it is necessary to repair the device frame and the transmission gear, it is best to replace the two components together and ensure long-term function. As for the shaft driven by the conveyor belt, pay close attention to the debris from the conveyor belt wear and its own hazards. Check the pulleys carefully and watch for signs of dust originating from the conveyor belt data. Ensure that the conveyor belt, drive pulleys and sheaves are completely placed in a row. Conveyor belts that go against the direction will wear out very quickly. As long as the system is driven by the conveyor belt, the preload of the conveyor belt itself can be checked according to the manufacturer's instructions. These standards will tell you: relative to the pulley, the appropriate amount of error in the specific orientation of the conveyor belt. Rubber injection molding machine automation


4. Pneumatic system


Including the multi-axis servo drive, almost all manipulators have pneumatic functions with only wrist rotation and vacuum grasping action. Pay close attention to the suction cup of the filter regulator unit. The accumulation of water in it indicates that the compressed air source passing through the system is too humid. The presence of a small amount of water vapor may be transmitted to the pneumatic valve and actuator, causing oxidation and internal pollution, and eventually may cause the pressure regulator to stick or the actuator to stick or fail intermittently. Assuming that the suction cup is equipped with an automatic dehumidification system, contamination or discoloration on the suction cup also indicates that moisture is increasing before it is removed. Assuming that water collects in the suction cup, it can enter the system even if the time is short, which constitutes the above question. If you notice any physical damage to the pneumatic hose, there may be a leak in the system. Assuming that the pneumatic circuit is filled with air under normal operating pressure and there is a leak somewhere in the circuit, then you should more easily find a significant hissing sound to help you determine the location of the leak.


5. Check the molding equipment


The standard manipulators are generally installed on the template of the molding equipment. When the equipment is working agilely, the vibration from the molding equipment may be transmitted to the manipulator and may cause damage. Simply query the working conditions of the molding equipment to ensure that the mold movement is adjusted to a reasonable level, reduce the number of shaking or vibration, and extend the life of the manipulator. In the case of high-speed work, the vibration frequency may be very high, and it is best to install the manipulator on a supporting structure independent of the molding equipment. Rubber injection molding machine automation


6. Watch out for wiring wear


When inspecting the surface of the manipulator, if black particles or powder are found, it will indicate signs of wear on the wiring of the manipulator circuit. However, even if you can't detect these signs of wear, carefully observe all power supply, transformer or encoder cables. The front and back sides of the wiring route are also acceptable, because during the production cycle, the wiring of the robot is successively interfered with or connected to the cable guide. The wiring will eventually wear out and fail. Ensure the safety of wiring ties and reasonable installation of cables.


7. Check lubrication


The manipulator of the injection molding machine uses a spring-loaded lubricating rod. Unless there is an indication that the guide rail is not sufficiently lubricated, it only needs to be replaced once a year. Equipped with an automatic lubrication system, it can be lubricated successively along the movement of the manipulator. But suppose there are some surfaces on which the manipulator cannot move normally, then manually lubricate these areas, or complete the timing program control action of the automatic system lubrication for lubrication. Suppose you find rust spots, corrosion or wear on any moving surface, perhaps just too dry, it means they are insufficiently lubricated. Always refer to the manipulator manual for reasonable lubrication of metal parts. The device beam-traditional gear system is automatically lubricated through a lubricating oil storage unit, but it needs to be replaced every year. Rubber injection molding machine automation


8. Vacuum gripper circuit


The vacuum should be formed close to the instant, and the appropriate controller input should be equivalent to grabbing the product. Suppose you find that you turn on the vacuum, and then the input light source appears, and the delay time exceeds 2 seconds, then it indicates that there is a leak in the vacuum line, a defect, or the switching equipment is not properly adjusted. The test can be easily performed through the main control panel plug-in. Assuming that the manipulator is equipped with a digital vacuum switching unit, it can quickly and automatically fine-tune the minimum threshold of vacuum required to grasp the product. This process can be finished when the robot is working in automatic working mode. Save the setting parameters of each production cycle in the memory, which can save time when the production is changed only once. There are two other advantages of digital vacuum switching equipment: The electronic filter of the capture threshold signal compensates for the vibration of the product on the vacuum chuck during agile movement. The product release threshold is different from the grab threshold and can be programmed to ensure proper release under the conditions of agile production cycle. Rubber injection molding machine automation

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