There are many types of plate-making machines, and the light sources used are also different. Here we introduce the structural characteristics of the box-type plate-making machine, and give some descriptions of the different characteristics and common failures of various box-type plate-making machines. The shape of the box-type plate-making machine is a cubic structure, the upper cover is a rubber seal frame, and there is a rubber seal around the seam, and there is a handle, which can be lifted. Use the air pipe to connect with the vacuum pump. Between the box below, there is a lock in the front, a hinge in the back, and braces on both sides. Under the sealing cover is flat glass with excellent transparency, uniform texture and a thickness of about 10mm. An exhaust fan is installed behind the cabinet. The middle part is the light box, and there is a light source of iodine gallium lamp or halogen light source in the box. Around the light source is a reflector with reflected parallel light. The precision screen exposure machine uses a photoelectric integrator to control the light and has the function of automatically limiting the exposure time. Ordinary screen exposure machines use standard seconds to limit the exposure time. When you need to make a screen, open the frame of the blanket, first stick the photographic film on the surface of the parallel glass plate, then stick the printed surface of the screen frame coated with photosensitive adhesive to the surface of the film of the film, and then cover the rubber Start the evacuation of the cloth frame, use the shrinkage of the rubber cloth, firmly attach the mesh surface and the negative film to the glass plate, turn on the light source of the exposure lamp with a certain wavelength, set the best exposure time, and wait for the exposure time Then automatically turn off the light source. It can also be changed from automatic operation mode to manual operation mode. The quality of a printing machine mainly depends on three factors. The first is whether the vacuum pumping system of the printing machine can make the photographic film and the photosensitive material on the screen closely adhere without leaving any gaps; In the second exposure, whether the illuminance in the middle and the periphery of the entire layout is uniform. Third, a control circuit with stable working performance and a stable and durable exposure light source during exposure. Several different types and characteristics of box-type plate-making machine have different fault phenomena. But no matter what kind of problem will directly affect the quality of plate making. The following is a brief description of the structural characteristics of several different types of plate-making machines and the analysis and elimination of faults. 1. The common faults that occur in several printing machines include: 1. Due to insufficient or no suction, the photographic film and the photosensitive material on the mesh surface cannot be closely attached to the glass plate, resulting in unqualified screen plates such as misalignment, distortion, jaggedness, and blurring. The reason for the failure of the printing machine is insufficient suction or no suction. The main analysis steps are as follows: the preliminary judgment method is to separate the vacuum pump from the trachea, block the suction port of the vacuum pump with your thumb, and observe whether the barometer pointer points to the maximum value , If it points to the maximum value, it indicates that the vacuum pump is operating normally, and it should be judged that there is air leakage in the trachea and blanket (including: air leakage in the blanket due to trachoma; air leakage due to poor adhesion of the sealing tape; air leakage in the cover plate) If the screw is not adjusted properly, air leakage will occur if it is loose or tight; air leakage will occur when the connection of the suction pipe is loose or loose. If the pointer of the barometer is not reflected or is very small, it means that the vacuum pump is not operating normally (fault phenomena include: the vacuum pump motor coil burns out and stops running, the vacuum pump is stopped due to oil, and the vacuum pump damages the blades to cause insufficient suction, etc. Reasons). 2. After using the printing machine for a certain period of time, I feel that the actual exposure time is much longer than the expected exposure time. (1) The working energy of the exposure lamp is reduced for a long time, and the lamp tube must be replaced. (2) Even if a new lamp is replaced, the required exposure time is still long. At this time, first consider the cleanliness of the cabinet; secondly, consider whether the reflector has a good reflection effect, and the light transmission effect of the glass plate; and secondly, consider whether there is a problem with the quality of the new lamp tube replaced this time. Second, the analysis and elimination of the different characteristics and faults of various printing machines: 1. SWE1100 type plate-making machine, the power is 2KW. Adopt relay control circuit and push button operation panel. Equipped with functions such as vacuum pumping and exposure timer. Manually inhale and expose, and automatically stop at the scheduled time. Common faults: The power indicator on the panel is on, but it cannot start. Fault check sequence: A. Insurance burnout; B. Carbonization of AC contactor contacts, poor contact or coil burnout; C. Thermal relay trips automatically; D. Vacuum pump burnout or stuck; E. Exposure lamp burnout; F. Rectifier Trigger failure. 2. SWE1200A type printing machine, the power is 3KW. Using microcomputer control, with ten sets of memory channels. There are two types of imported oil-free silent vacuum pump and ordinary domestic vacuum pump. Circuit board control circuit, touch operation panel. After the exposure time is set, the time is not running in standard seconds, but a photoelectric integrator is used to control the light, and the exposure time is automatically limited to compensate for the lack of light. It is easy to operate and is not affected by the aging of the lamp and the operator's experience. It is suitable for the production of fine lines, dot patterns and circuit board screens. Practical and economical. With automatic and manual exposure. In automatic mode, it has the function of performing second pumping after pre-pumping. The preset pumping time expires and automatic exposure. Automatically stop when preset exposure time. The manual method is to start manually and stop manually. Failure phenomenon analysis: A. The number on the operation panel is weak or incomplete. Due to the damage of the rectifier bridge, the 5V DC input voltage value of the operation panel is not enough or the (7805) delta regulator fails; B. The suction pump and exposure lamp cannot be turned on. The 24V output voltage of the rectifier bridge, (7824) delta regulator or IC integrated block is broken through and malfunctions; C. It is impossible to realize the second suction when it is automatic, that is, the suction power of the blanket is not enough to affect the plate making. The solenoid valve above the vacuum pump is disconnected, burned out or the control relay is damaged; D. The UV lamp is a negative-resistance gas discharge device. No matter it is good, it is in an open state when measured with a multimeter. In general, even if it is damaged, it is in an open state, which will not affect the circuit, but it is likely to be under high pressure There will be a short circuit or very low internal resistance. At the end of pumping, the control circuit goes into working state, and the high voltage output by the booster transformer is applied to both ends of the lamp instantly. Due to the short circuit or extremely low internal resistance, the strong inrush current causes a very high self-inductance potential to enter through other lines Control circuit caused a malfunction. At this time, it will cause the failure of the microcomputer control circuit board and the phenomenon of the rectifier bridge being penetrated. This kind of failure is a special case. 3. W-SP-3648A / 4860A precision screen printing machine, the power is 3KW. Using microcomputer control, with 25 sets of memory channels. Equipped with oil-free silent vacuum pump. Circuit board control circuit, touch operation panel. It can realize the conversion between standard seconds and volume exposure time. When using volume exposure, the time is not running in standard seconds, but a photoelectric integrator is used to control the light, and the exposure time is automatically limited to compensate for the lack of light. It is easy to operate and is not affected by the aging of the lamp and the operator's experience. With automatic and manual exposure. The manual method is to start manually and stop manually. Except for replacing the exposure lamp according to the normal use time, other failure rates are extremely small. The lamp can be started continuously, that is, the interval between stopping and starting only needs 3 to 5 seconds. It is suitable for the production of fine lines, dot patterns and circuit board screens. Excellent material selection, reasonable design and beautiful production. In short, no matter which type of drying machine is used, or which kind of failure is encountered in the work, you must understand and understand the machine performance principle and the cause of the failure, and take the right medicine. Care should be taken in daily work, and the exhaust system should be checked frequently. The vacuum pump should be checked once a month, and vacuum oil should be added regularly. Clean the suction pipe to keep the suction hose free of dust and debris. The surface of the glass plate should be absolutely clean, and it should be wiped clean with absorbent cotton, gauze and absolute alcohol, including point light sources and reflectors. Change the exposure light source regularly to avoid weakening of the light intensity of the light source. It is not appropriate to master the exposure time and affect the quality of plate making. The Blush brush is a makeup tool used to apply blush in makeup. There are many styles, choosing the right blush brush can make facial makeup more delicate.
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