Used injection molding machines are widely available in the market due to their affordability, and more and more customers are opting for second-hand options. However, it is crucial to verify the performance and quality of the machine before purchasing. Next, we'll introduce the inspection methods.

1. Inspect various hydraulic valves on used injection molding machines, particularly the mechanical hydraulic valves at the screw area, as they are more prone to damage due to the prolonged use of second-hand machines. Pay special attention during selection, as it's not cost-effective to repair after purchasing a second-hand low-pressure injection molding machine.

2. Inspect the operation of the second-hand injection molding machine. The injection molding mainly consists of three major structures: first, the material structure, which is used for feeding the material, including checking the material pipelines; second, the ejection structure, examining if the nozzle and pressure valve are ejecting at the correct pressure; third, the electrical circuit, checking for any aging of the electrical wires beneath the machine.

3. Inspect the used injection molding machine motor for proper functioning. The motor is a critical power source for the molding machine's operation. Often, when purchasing a used low-pressure injection molding machine, we fail to check if the motor is in good condition. If you're not able to inspect it yourself, you can seek assistance from an electrician to view it for you.