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First, preventive maintenance work (a), hydraulic part 1. The lack of hydraulic oil quantity will lead to oil temperature easy to rise, the air is easy to dissolve into the oil and affect the normal operation of the oil quality and hydraulic system, the oil is usually insufficient For oil or repair loss, for this reason, you should pay attention to check the leaked parts, replace the worn seals early, tighten the loose joints, etc. After maintenance, check the oil volume of the fuel tank and replenish it in time.
2. Hydraulic oil temperature The ideal working temperature of the hydraulic system should be between 45 °C and 50 °C. The reason is that the hydraulic system is designed according to the viscosity of a selected pressure oil, but the viscosity will change with the temperature of the oil. In turn, it affects the working components in the system, such as oil cylinders and hydraulic valves, which reduces the control accuracy and response sensitivity, especially for precision injection machines. At the same time, if the temperature is too high, the aging of the sealing member will be accelerated to harden and break. When the temperature is too low, the processing energy consumption is large, and the running speed is lowered. Therefore, it is necessary to pay close attention to the working temperature of the hydraulic oil. There are many reasons for the high oil temperature, but it is mostly due to the failure of the oil circuit or the failure of the cooling system.
3. Hydraulic oil One of the important properties of oily hydraulic oil is its chemical stability, ie oxidation stability. Oxidation is the main factor determining the effective service life of hydraulic oil. Insoluble materials such as wood tar, sludge and carbon residue generated by oxidation can contaminate the hydraulic system, increase the wear of hydraulic components, reduce various gaps, block small holes, and end up. Causing the hydraulic system to malfunction. The oxidation rate of hydraulic oil depends on many factors such as its own and working conditions. Temperature is one of the main factors. Therefore, it is necessary to use suitable hydraulic oil and regularly check the oxidation degree of hydraulic oil (from the color of oil itself) ), it is absolutely necessary to actively change oil after a certain number of working hours.
4. The oil filter cleaning oil filter plays the role of clean hydraulic oil. Therefore, the oil filter should be cleaned every three months to keep the oil suction pipe unblocked and check the oil filter net for damage.
5. The chiller cleaning chiller should be cleaned once a year, or cleaned according to whether its working capacity is reduced. The internal clogging or fouling of the chiller will affect the cooling efficiency. The cooling water should be soft (no minerals). .
(2) Electrical parts 1. Wire joints Checking the wires of the joints that are not fastened may cause high temperature or sparking damage to the joints. The joints may also affect the transmission of signals; the joints on the contactors may be vibrated by electromagnetic action. It is easier to loosen, so it is necessary to check the position of the wire connector and tighten it regularly.
2. Motors Generally, motors are air-cooled. Dust accumulation makes it difficult to dissipate heat. Therefore, it is regularly cleaned every year. Usually, the motor overload breaker is installed in the circuit. The limit current of the protection device is adjustable. The power is properly selected, and once the overload protector is activated, it should be determined whether the inverter is out of phase, the contact is bad, or the oil temperature is too high before pressing the return switch.
3. The heating tube and the thermocouple heating tube should be checked for fastening to ensure effective heat transfer. In normal production, the burning of the heating tube is not easy to detect. To this end, pay attention to the working condition of the temperature controller and judge the heat from it. Whether the tube is normal. In addition, the common damage of the heating tube is the wire connection. Due to the poor connection, the contact resistance increases, causing the interface to be overheated and the interface is oxidized and damaged.
4. The contactor of the electromagnetic contactor used in the electric heating part has a faster loss rate because of the frequent movement. If the main contact is overheated and melted and bonded, the heating temperature may be out of control, so if the contact is found to be overheated, it may sound or If the fire is very large at the time of breaking, it means that it is about to be damaged and should be replaced as soon as possible.
5. Computer control part With the application of microcomputer control technology on the injection molding machine, the normal operation of the microcomputer part and its related auxiliary electronic board to the fluctuation of the power supply voltage, the temperature and humidity of the working environment, the shock resistance of the installation and the external high frequency Signal interference has put forward higher requirements. For this reason, the fan for ventilation and heat dissipation in the control box is kept working normally, and the power supply with high precision is used to supply power. Try to reduce the influence of the external vibration of the control box. Aspects of the problem and regular inspection.
(C), mechanical part 1, template parallelism template parallelism zui can reflect the condition of the clamping part, the template is not parallel will make the product unqualified and increase the wear of equipment and mold. The parallelism of the template can be initially reflected by the movement of the tail plate during the clamping and the appearance analysis of the product, but the exact situation needs to be detected by instruments such as a dial gauge. The adjustment of the parallelism of the template must be carried out by familiar personnel in accordance with the steps, otherwise the improper adjustment will cause more damage to the machine.
2, mold thickness adjustment should be used regularly to use the mold thickness adjustment system, the mold thickness from zui thick to zui thin back and forth to ensure smooth movement, for long-term production of the same mold machine, this must be done to avoid failure.
3. All mechanical activities of the central lubrication system require proper lubrication. The central lubrication system is one of the necessary injection molding machines. The amount of oil in the central lubrication system should be checked frequently to see if it is full. The lubricant used should be clean and free of impurities to ensure that all lubrication locations are supplied with lubricant. It is found that the tubing is blocked or leaked and should be replaced or repaired immediately. Most mechanical wear occurs due to lack of lubrication, so there is enough attention to lubrication.
4, to maintain the smooth movement of each movement or not smooth may be due to improper speed adjustment, speed changes and time uncoordinated or mechanical, oil pressure adjustment. This type of vibration will cause the mechanical part to accelerate wear and loosen the tightened screws, so vibration should be reduced and avoided.
5. Bearing inspection The bearing has a strange sound during operation, or the temperature rise indicates that the bearing has worn inside. It should be inspected or replaced in time, and re-injected grease.
6. Injection system The injection screw, the check ring and the barrel form the heart part of the injection molding machine, which determines the quality and efficiency of the processing and must be kept in good working condition. First, take the necessary measures to prevent non-plastic debris from mixing into the plastic stream. Also, pay attention to checking the correct clearance between the screw and the barrel, the check ring and the barrel. The normal gap should be able to seal the plastic backflow and produce plastic. For the shearing action required, the wear of the screw, the check ring and the barrel should be checked when it is found that the melt action is slow, the melt has spots and black spots, or the product is unstable.
Second, the causes and solutions of some common faults (A), oil temperature is too high Oil temperature abnormal rise may be caused by abnormal cooling system or high pressure of hydraulic components when working.
1. The cooling system is not normal. 1) The cooling system is insufficiently supplied. If the water raft is not fully opened, the water pressure is insufficient or the pump flow does not meet the requirements.
2) Blockage of pipes, such as filters, cooling towers or water pipes.
3) The cooling water temperature is too high, such as the cooling tower cooling capacity is insufficient, or the damage or the temperature is too high.
2. The hydraulic system generates high heat. 1) The oil pump is damaged, and the internal parts wear high heat when rotating at high speed.
2) The pressure regulation is not proper, and the hydraulic system is in a high pressure state for a long time and is overheated.
3) Internal leakage of the hydraulic components, such as damage to the directional valve or damage to the seal ring, causes heat to be generated when the high pressure oil flows through the small space.
(2) Noise generates abnormal noise, indicating that parts are damaged or improperly adjusted. The cause should be repaired according to the location of the noise.
1. The hydraulic oil in the fuel tank is insufficient. The suction of the oil pump or the dirt of the oil filter will cause the oil pump to be short of oil, causing the air bubbles in the oil to leak and hit the blade to generate noise. The solution is to check the oil quantity and prevent the air from being inhaled. Clean the oil filter.
2. The viscosity of the hydraulic oil is high, and the flow resistance is increased. It is necessary to replace the suitable hydraulic oil.
3. Due to the damage of the bearing or blade of the oil pump or motor, the concentricity deviation of the coupling causes noise, and the concentricity or replacement parts must be adjusted. 4, the directional valve reaction is not effective but the function is still, such as valve core wear, internal leakage, burr blocking, movement is not flexible, solenoid valve failure due to insufficient current will also produce noise. The solution is to clean the valve core, the valve core must be replaced with new parts, and the current must be stable and sufficient.
5. The hydraulic components are damaged or the oil pipelines are blocked, causing noise when the hydraulic oil flows at high speed.
6. If the mechanical part is faulty, the bearing is worn or the machinery lacks lubricating oil or the parts are loose, the reason should be found to fasten or replace the parts.
Ensure that there is enough lubricant.
(III) Unstable or unsatisfactory production of the product In the stable production cycle, the quality of the finished product is unstable, which may be caused by the wear or adjustment of the mechanical parts.
1. Wear of screw, check ring and barrel.
2. The inner seal of the injection cylinder is damaged and internal leakage occurs.
3. The temperature control of the heating cylinder is unstable.
4. The pressure and speed control are partially abnormal.
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SPECIFICATION
NORMAL PACKING
Cimitidine
Tab. 0.2g 0.4g
Injection 200mg/2ml
1000`S/Tin
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Inj 20mg/Ml
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Lansoprazole
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2x12/Blister/Box
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Omeprazole
Tablet 20mg
For Injection 40mg
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Capsule, Tablet 40mg
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Tablet 5mg ; 10mg
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Nitroglycerine
Aerosol 14g 200dose
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Tablet 80mg
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Preventive maintenance and repair work for injection molding machines
Injection molding machine is one of the commonly used equipments in the plastics processing industry. Usually it takes a long time to work. Therefore, how to ensure the normal operation of the injection machine in continuous production is a concern for both the manufacturer and the user of the injection machine. In order to solve the problem, from the user's point of view, under the premise of correct selection of the injection machine type, regular preventive maintenance is an effective way to ensure the normal operation of the injection machine. The so-called preventive maintenance is a series of preventive work and inspections to avoid machine failures and extend the working life of all parts, such as the sudden failure of the shutdown to turn into a foreseeable and planned downtime repair or overhaul; The discovery and replacement of damaged parts can prevent chain damage and other preventive maintenance purposes.
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