A corrugated box printer is a printed “banknote†machine of a carton manufacturing company. If a machine failure cannot be repaired as soon as possible, not only can the carton manufacturing company not print “banknotesâ€, but if it affects the delivery of carton orders, it may result in zero inventory. Carton production line shut down. Now most high-speed printers use PLC man-machine interface and field network bus control. If you can master basic maintenance knowledge and correct fault diagnosis skills, you can quickly resolve the problem and resume normal production.
Basic knowledge of maintenance Through the on-site training of the manufacturer or checking the equipment instructions, the mechanical structure of the equipment, the disassembly method and location of the mechanical parts and components are understood.
Maintenance personnel usually learn more about automation control. Such as PLC, field network control bus, Siemens PROFIBUS field bus, CCLINK network bus, continue to accumulate their own professional knowledge.
To find relevant electrical equipment related information, we must first understand the electrical schematic diagram, including: 1. Power supply part (primary circuit). The power line from the main switch to each control unit drive motor is typically a 380V circuit. 2. Control line power section (secondary circuit). Each unit controls the power supply of the component, and 220V power supply for the PLC (Programmable Logic Controller) and the DC 24V power module. DC24V power supply, generally control element power supply. Such as the output of the implementation of components: contactors, solenoid valves, lights, alarm bell power; input conditions components encoder, proximity switches, photoelectric switch power supply and the common point of power switch. 3. Network field bus. Generally, it is controlled by a main touch screen (or industrial control computer) and is connected to the PLC of the master station. The network circuit of the master station is sequentially connected from the master station to each unit. According to each type of network, the communication cable connection is also different. It is easy to pick up the wrong network cable during maintenance to cause network communication failure. 4. Safety circuit control. The most likely to cause the device to fail to start up, is generally a safety circuit for emergency stop lines and unit operation. Most manufacturers control via safety relays, so be sure to familiarize yourself with the principle and wiring of this circuit.
When you understand the above electrical principles, you can find components on the machine based on electrical schematics. For example, the installation position of various motors, the installation position of the encoder, the position of the detection proximity switch, the installation position of the solenoid valve, and the installation position of all the limit switch positions must be identified on the machine, so it is best to take a picture. Data plus label. When a function or component has a problem, it can be quickly found on the machine and improve the maintenance efficiency.
How to quickly determine the fault must first determine whether it is a mechanical fault, a circuit fault, or an air circuit fault. The following method can be used to judge.
Listen: During operation, analyze the basic structure of the part based on the location of the sound, and find out the reason. For example, a large sound is produced when paper is fed. If there is no regular noise during operation, even if it is operating normally, it must be stopped to find out the problem. In the case of a corrugated box printer, if a sun wheel box feeding system is used, if there is noise from the wheel box, the bearing of the wheel box cam disk may be broken, which is a mechanical failure and must be repaired in time. The sound of other units mainly comes from the contact between the notched knife's chamfering knife and the bottom knife holder.
Touch: When there is a vibration phenomenon during operation, you can touch the machine with your hand to feel which unit has abnormal vibration. Firstly, the clearance between the die-cutting and the slotting knife is increased. If the vibration is abnormal and the speed is not uniform, it may be an electrical problem. Generally appear in the DC drive DC motor drive as a host. If the tachometer generator or the host encoder is damaged, the vibration caused by the non-uniform speed will occur. In this case, the host belt can be removed and the host motor can be independently rotated. If the speed of motor vibration is not uniform, it is a malfunction of the DC motor system. The inspection method adopted in the case of an abnormality in each power transmission section is simply to remove the load and test the power motor alone and measure whether the load current of the motor is below the rated current of the motor. This makes it easy to test the cause of the mechanical load and to check other parts, such as bearings. You can also intuitively feel the temperature of the motor is normal. If the motor temperature is normal when there is no load, check the load portion.
Exclusion method: If some function of the machine is abnormal, determine the cause of the failure through the elimination method. First determine where the executive component of the function is, and what components are involved. There are mainly electrical and mechanical execution components. Check whether the electrical actuator is normal and then determine if it is a mechanical cause. The electric actuators are mainly executed through the output points, contactors, and solenoid valves of the PLC. The mechanical actuators are cylinders, anilox rollers, rubber rollers, printing rollers, slotted knives, and clutches. If a function is abnormal, first check the PLC output point related to this function, and then check the contactor and solenoid valve driven by the output point and check it step by step. If the electrical actuator inspection is normal, it is a related mechanical element problem. If there is no output display of the PLC output point related to this function, then analyze the relevant conditions of the output. Such as limit switch, off switch protection element inspection. For example, if a certain printing unit is suddenly out of ink, in this case, check and print the ink-related elements first: ink pump, anilox roller ink cylinder, anilox roller and anilox roller clutch.
In addition, individual electrical faults also need to use the elimination method to determine the specific cause. For example, the host can not start, first check whether the system has an alarm display, analysis of the host can not start the relevant components and circuits, is the PLC hardware is broken, or power supply problems, or network circuit problems, and then check the safety circuit, step by step rule out, and finally quickly determine malfunction.
How to quickly repair corrugated box printing machinery? It is necessary to first understand and be familiar with the working principle, mechanical components and electrical principles of mechanical equipment, supplemented by the above-mentioned techniques for quickly determining faults. If you do not pay attention to the collection of information and do not pay attention to the method, you will be in a hurry and do not know what to do when it is repaired, or even cause secondary failures, which will seriously affect production.
Basic knowledge of maintenance Through the on-site training of the manufacturer or checking the equipment instructions, the mechanical structure of the equipment, the disassembly method and location of the mechanical parts and components are understood.
Maintenance personnel usually learn more about automation control. Such as PLC, field network control bus, Siemens PROFIBUS field bus, CCLINK network bus, continue to accumulate their own professional knowledge.
To find relevant electrical equipment related information, we must first understand the electrical schematic diagram, including: 1. Power supply part (primary circuit). The power line from the main switch to each control unit drive motor is typically a 380V circuit. 2. Control line power section (secondary circuit). Each unit controls the power supply of the component, and 220V power supply for the PLC (Programmable Logic Controller) and the DC 24V power module. DC24V power supply, generally control element power supply. Such as the output of the implementation of components: contactors, solenoid valves, lights, alarm bell power; input conditions components encoder, proximity switches, photoelectric switch power supply and the common point of power switch. 3. Network field bus. Generally, it is controlled by a main touch screen (or industrial control computer) and is connected to the PLC of the master station. The network circuit of the master station is sequentially connected from the master station to each unit. According to each type of network, the communication cable connection is also different. It is easy to pick up the wrong network cable during maintenance to cause network communication failure. 4. Safety circuit control. The most likely to cause the device to fail to start up, is generally a safety circuit for emergency stop lines and unit operation. Most manufacturers control via safety relays, so be sure to familiarize yourself with the principle and wiring of this circuit.
When you understand the above electrical principles, you can find components on the machine based on electrical schematics. For example, the installation position of various motors, the installation position of the encoder, the position of the detection proximity switch, the installation position of the solenoid valve, and the installation position of all the limit switch positions must be identified on the machine, so it is best to take a picture. Data plus label. When a function or component has a problem, it can be quickly found on the machine and improve the maintenance efficiency.
How to quickly determine the fault must first determine whether it is a mechanical fault, a circuit fault, or an air circuit fault. The following method can be used to judge.
Listen: During operation, analyze the basic structure of the part based on the location of the sound, and find out the reason. For example, a large sound is produced when paper is fed. If there is no regular noise during operation, even if it is operating normally, it must be stopped to find out the problem. In the case of a corrugated box printer, if a sun wheel box feeding system is used, if there is noise from the wheel box, the bearing of the wheel box cam disk may be broken, which is a mechanical failure and must be repaired in time. The sound of other units mainly comes from the contact between the notched knife's chamfering knife and the bottom knife holder.
Touch: When there is a vibration phenomenon during operation, you can touch the machine with your hand to feel which unit has abnormal vibration. Firstly, the clearance between the die-cutting and the slotting knife is increased. If the vibration is abnormal and the speed is not uniform, it may be an electrical problem. Generally appear in the DC drive DC motor drive as a host. If the tachometer generator or the host encoder is damaged, the vibration caused by the non-uniform speed will occur. In this case, the host belt can be removed and the host motor can be independently rotated. If the speed of motor vibration is not uniform, it is a malfunction of the DC motor system. The inspection method adopted in the case of an abnormality in each power transmission section is simply to remove the load and test the power motor alone and measure whether the load current of the motor is below the rated current of the motor. This makes it easy to test the cause of the mechanical load and to check other parts, such as bearings. You can also intuitively feel the temperature of the motor is normal. If the motor temperature is normal when there is no load, check the load portion.
Exclusion method: If some function of the machine is abnormal, determine the cause of the failure through the elimination method. First determine where the executive component of the function is, and what components are involved. There are mainly electrical and mechanical execution components. Check whether the electrical actuator is normal and then determine if it is a mechanical cause. The electric actuators are mainly executed through the output points, contactors, and solenoid valves of the PLC. The mechanical actuators are cylinders, anilox rollers, rubber rollers, printing rollers, slotted knives, and clutches. If a function is abnormal, first check the PLC output point related to this function, and then check the contactor and solenoid valve driven by the output point and check it step by step. If the electrical actuator inspection is normal, it is a related mechanical element problem. If there is no output display of the PLC output point related to this function, then analyze the relevant conditions of the output. Such as limit switch, off switch protection element inspection. For example, if a certain printing unit is suddenly out of ink, in this case, check and print the ink-related elements first: ink pump, anilox roller ink cylinder, anilox roller and anilox roller clutch.
In addition, individual electrical faults also need to use the elimination method to determine the specific cause. For example, the host can not start, first check whether the system has an alarm display, analysis of the host can not start the relevant components and circuits, is the PLC hardware is broken, or power supply problems, or network circuit problems, and then check the safety circuit, step by step rule out, and finally quickly determine malfunction.
How to quickly repair corrugated box printing machinery? It is necessary to first understand and be familiar with the working principle, mechanical components and electrical principles of mechanical equipment, supplemented by the above-mentioned techniques for quickly determining faults. If you do not pay attention to the collection of information and do not pay attention to the method, you will be in a hurry and do not know what to do when it is repaired, or even cause secondary failures, which will seriously affect production.
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