Core of injection molding machine maintenance work is fault judgment and fault handling. It involves a wide range of knowledge, a large degree of complexity, and has a certain depth (such as comprehensive professional knowledge level). It is necessary to have basic knowledge of mechanical equipment maintenance, basic knowledge of hydraulic maintenance, and basic knowledge of electrical maintenance.
In fact, maintenance of injection molding machines is difficult, but it is also a process of continuous learning and progress. As long as you master basic working principles of injection molding machines and master basic working methods, no matter various models, you can explore a set of maintenance work procedures to ensure normal operation of injection molding machine.

 

1. Maintenance workers must first understand and master contents of operation manual of injection molding machine, be familiar with and master mechanical parts, circuits and oil circuits of injection molding machine, understand working process of machinery, circuits and oil circuits of injection molding machine during normal operation, understand and master inspection and maintenance methods of electrical components and hydraulic components. Clear normal working state and abnormal working state to avoid time-consuming misjudgment and misassembly.
2. Maintenance work must understand operation method of equipment and have some basic knowledge of injection molding, and will use injection molding machine correctly. If you don't know how to operate injection molding machine, maintenance work is very difficult, and fault diagnosis may be unreliable.
Circuit boards and electrical components in injection molding machine are affected by high temperature, environment, time and other factors for a long time, device operating point is shifted, and aging degree of components is within the normal range.
Therefore, debugging injection molding machine is also one of essential basic skills in maintenance work. It is very important to understand working procedures of injection molding machine, to debug electronic circuit and hydraulic oil circuit of injection molding machine.
3. To achieve accurate, reliable and timely maintenance work, it is necessary to study and master contents of instruction manuals of various types of injection molding machines.
In general maintenance process, maintenance idea is usually circuit-oil circuit-mechanical component action. Adjustment work is carried out in reverse, such as mechanical action and clamping pressure, etc., you can find oil circuit and circuit, if circuit output is normal, adjust oil circuit valve. If oil circuit works normally, adjust circuit electronic board. Of course, final adjustment is made, but relationship between the three is interdependent and controlled.
Correct use of instruments, adjustment of detection circuits, maintenance of oil circuits, and adjustment of position and movement of mechanical parts are important means of judging faults. Generally, injection molding machine manufacturer only gives electrical block diagram of equipment, block diagram of oil circuit and main parts of machine, which is not enough for maintenance work.
It is necessary to pay attention to collection and arrangement of relevant data in all aspects during daily maintenance work. Such as electrical, electronic, mechanical spare parts, oil circuit, solenoid valve body, etc. For example, if there is an opportunity in electrical field, it is necessary to survey and map circuit schematic diagram, schematic diagram of electronic board and actual wiring diagram, and measure relevant information such as devices corresponding to wiring terminals, so as to provide accurate detection points for fault judgment and analysis during maintenance, measure specific parameters of its detection point.
When necessary, it is necessary to make power supply, simulate input and output signals, carry out simulation tests or adjustments to master and obtain the first-hand maintenance data, such as parameters of working points at all levels.
4. Same is true for oil circuit maintenance, which must be comprehensively adjusted and maintained according to characteristics of oil circuit and hydraulic solenoid valve. There is an opportunity to disassemble, clean, inspect and install solenoid valve frequently. These processes cause a lot of trouble, but are crucial.
5. Maintenance work must master and sort out fault maintenance methods and judgment procedure diagrams that conform to principles and logic. In combination with actual maintenance work on weekdays, collect relevant information on injection molding machine. In case of failure, the methods include step-by-step inspection method, simulation inspection method, voltage test method, on-off test method, circuit board replacement method and other methods. After repair, it is necessary to re-adjust working point, re-adjust, and carry out a load test to make equipment work within parameter range of data listed in operation manual.