{"id":3448,"date":"2026-11-12T11:58:16","date_gmt":"2026-11-12T03:58:16","guid":{"rendered":"https:\/\/www.samfacc.com\/?p=3448"},"modified":"2026-11-06T13:42:07","modified_gmt":"2026-11-06T05:42:07","slug":"6-common-injection-robot-problems-and-how-to-fix-them","status":"publish","type":"post","link":"https:\/\/www.samfacc.com\/zh\/6-common-injection-robot-problems-and-how-to-fix-them\/","title":{"rendered":"6 Common Injection Robot Problems and How to Fix Them"},"content":{"rendered":"

Injection robot<\/a>s\u00a0perform many operations related to part removal, handling, and insertion during plastic injection. Nevertheless, continuous use of the robot can cause various troubles, including inability to pick up a part, positioning issues, and unplanned stops. Knowing the reasons for this and how to solve them can prevent production interruptions. Below are six\u00a0injection robot\u00a0issues and ways to\u00a0solve <\/a>them.<\/p>\n

\"Injection<\/p>\n

1. Failure of the\u00a0Injection Robot\u00a0to Pick Up the Molded Parts<\/h2>\n

One of the primary functions of an\u00a0injection robot\u00a0is part removal. The inability of the robot to grip the part means that the robot will try to reach the required position and fail to hold the molded part securely. Sometimes, the product will fall from the robot during handling.<\/p>\n

Causes:<\/h4>\n

Improper sizing or shape of the grippers compared to the molded part.<\/p>\n

Worn-out vacuum cups or a leak in the vacuum system.<\/p>\n

Improperly set pickup position.<\/p>\n

Incomplete cooling of the molded part resulting in its sticking to the mold.<\/p>\n

Solution:<\/h4>\n

Use the right grippers or suction cups depending on the part dimensions and weight.<\/p>\n

Inspect the vacuum generator, vacuum hoses, and connections to make sure the suction is steady.<\/p>\n

Calibrate the pickup coordinates to make sure the robot reaches the right position.<\/p>\n

Monitor the cooling period and mold ejection system.<\/p>\n

2.\u00a0Injection Robot\u00a0Has Positioning Errors<\/h2>\n

Proper positioning is vital for effective pick-and-place tasks. Failure to reach the specified coordinates may lead to improper positioning of the parts. In extreme cases, the robot’s gripper will obstruct the mold or even the rest of the machinery.<\/p>\n

Possible Reasons:<\/h4>\n

Inappropriate settings of the home position or motion coordinates.<\/p>\n

Malfunction of the servo motor, encoder, or positioning system.<\/p>\n

Loose guide rails, bolts, and other mechanical parts.<\/p>\n

Excessive load.<\/p>\n

Solution:<\/h4>\n

Check home position and motion coordinate settings. Recalibrate the robot when required.<\/p>\n

Diagnose the malfunction of the servo motor and the encoder feedback signal.<\/p>\n

Look for any loose guide rails, bolts, and other mechanical parts.<\/p>\n

Determine the total weight of the workpiece and gripper.<\/p>\n

3.\u00a0Injection Robot\u00a0Moves Slowly or Stops Unexpectedly<\/h2>\n

In the case of a decrease in movement speed, the cycle time of production can be increased. Unplanned stoppages may even be more damaging to operations because of the integration of the robot with the injection molding machine.<\/p>\n

Possible Causes:<\/h4>\n

Parameters of speed, acceleration, or deceleration do not suit the current task.<\/p>\n

An alarm was generated by the servo drive, or it operates abnormally.<\/p>\n

The motor heated up and has turned on the protection mode.<\/p>\n

Lack of lubrication leads to an increase in friction in the guide rails or transmission.<\/p>\n

How to Fix It:<\/h4>\n

Analyze the parameters of the motion control system and regulate speed according to the needs of production.<\/p>\n

Analyze the error codes of the servo drive and detect problems with the drive or motor.<\/p>\n

Check the cooling fan, motor temperature, and electrical power.<\/p>\n

Clean and lubricate the guide rails and transmission according to the instructions of the manufacturer.<\/p>\n

\"Injection<\/p>\n

4.\u00a0Injection Robot\u00a0Cannot Communicate with the Injection Molding Machine<\/h2>\n

The robot needs to be able to communicate with the molding machine in order to carry out its tasks properly. For instance, the robot needs to know that the mold has been opened to go inside. In the case of a breakdown in communication, the robot may not begin its pick-up cycle, and vice versa, the molding machine will not get confirmation about the position of the robot.<\/p>\n

Possible Causes:<\/h4>\n

Loose or faulty communication and signal wires.<\/p>\n

Incorrect configuration of input\/output (I\/O) signals.<\/p>\n

Mismatching of PLC settings and communication protocol.<\/p>\n

Unsatisfied safety interlocks, like a door switch or position of the mold.<\/p>\n

How to Fix It:<\/h4>\n

Inspect communication cables and terminal connections for any problems.<\/p>\n

Inspect the PLC program and I\/O signals to make sure that both devices recognize each other.<\/p>\n

Make sure that the communication protocol and communication parameters match.<\/p>\n

Inspect safety door switches, mold opening signals, and robot position signals.<\/p>\n

5.\u00a0Injection Robot\u00a0Produces Excessive Vibration or Noise<\/h2>\n

Some level of mechanical noise is expected during robot operations. However, knocks, mechanical friction, and vibration should not be considered a normal phenomenon. They might be caused by loose components and wear of mechanical parts and can influence the positioning precision and the service life of moving elements.<\/p>\n

Reasons:<\/h4>\n

The robot’s base or mechanical connection is loose.<\/p>\n

Bearings, guide rails, or transmissions are worn.<\/p>\n

Acceleration and deceleration parameters are too high.<\/p>\n

Improper installation of the gripper or unbalanced loads.<\/p>\n

Solution:<\/h4>\n

Inspect the robot arm, the mounting base, and bolts; tighten up loose elements.<\/p>\n

Check bearings, guide rails, and transmissions for wear and replace parts in case of damage.<\/p>\n

Reduce acceleration and deceleration values to decrease vibration during high-speed movements.<\/p>\n

Optimize the gripper design and distribute loads properly to minimize additional movements.<\/p>\n

6. Frequent Alarm Signals of\u00a0Injection Robot<\/h2>\n

Repeated alarms point to mechanical faults, problems with the electrical elements, or issues with the motion control system. The user will see error messages on the control panel, will have difficulties starting the process, and the operation may stop unexpectedly at some robot position.<\/p>\n

Reasons:<\/h4>\n

Signals from proximity sensors, limit switches, or other sensors are incorrect.<\/p>\n

Servo drive or electric elements of the\u00a0injection robot\u00a0are defective.<\/p>\n

An unstable power supply or loose wiring is affecting the operation of the system.<\/p>\n

Mechanical obstacles are triggering the robot’s safety function.<\/p>\n

Solutions:<\/h4>\n

Note the alarm code on the control panel and look up the equipment manual to find which element has the problem.<\/p>\n

Inspect proximity sensors, limit switches, and other sensing elements for incorrect signals.<\/p>\n

Inspect servo drive, electric elements, and wiring connections. Repair or replace malfunctioning parts.<\/p>\n

Look for mechanical obstacles in the guide rails, transmissions, and movement limits.<\/p>\n

Do not restart the machine without the reason for the malfunction. In case of an alarm that is related to the drive system or electric control system, qualified personnel should inspect the machine.<\/p>\n

7. How to Prevent Common\u00a0Injection Robot\u00a0Problems?<\/h2>\n

Fixing the machine in case of failure can interfere with production processes and lead to higher maintenance costs. Maintenance activities will contribute to reducing the risk of unforeseen failures and ensure that the equipment operates efficiently.<\/p>\n

For factories, it may be useful to:<\/h4>\n