Talking about the cold end equipment and network structure of float glass production line
[China Glass Network] First, cold end equipment
(1) Emergency cutting area. The emergency cutting area includes an emergency cutting bridge and an emergency drop board, wherein the emergency cutting bridge cuts the continuous glass ribbon, and the emergency drop roller path falls and accelerates the delivery of the glass to the broken glass recycling system.
(2) Frying board detection photoelectric switch. A row of frying board detection photoelectric switch is installed after the emergency cutting area to detect the frying board. An alarm occurs when any of the photoelectric switches does not detect the glass.
(3) Defect detector. The high-performance online defect detector system developed by Lasor of Germany eliminates some of the drawbacks of manual detection.
(4) Cutting area. The cutting area was introduced from Grenzebach and includes edge detectors, speed measuring wheels, slitting bridges, cross-cutting bridges and breaking systems. This system is one of the core systems of production.
1. The edge detector is mainly used to detect the edge of the glass and transmit this information to the cutting bridge. There are six main data: the left side, the left outer tooth print, the left inner tooth print, and the right inner tooth. Print, right outer teeth, right side. Mainly used for cutting bridges to accurately control the cutting size. There is a reflective strip on each side of the edge detector, which is periodically cleaned according to the cleanliness of the site.
2. The speed measuring wheel is used to measure the exact speed of the glass ribbon and transmit this signal to the cutting bridge and the defect detector. The speed measuring wheel is used one by one, and the two do not interfere with each other. Note that if it is used for a long time without maintenance, the outer rubber of the wheel will be covered with glass swarf. At this time, the speed of the speed measuring wheel is not accurate, so we need to replace and wipe the speed measuring wheel at regular intervals.
3. Two slitting bridges, each with 7 knives, and the 1st and 2nd bridges can work either alone or alternately. When the glass ribbon exceeds the preset value of the deviation, the cutter wheel in use continues to cut, and the cutter wheel in the standby is adjusted horizontally with the tool holder, and the moving distance is the deviation value measured by the edge detector. Use the cutter wheel and the spare cutter wheel to prepare the tool change. At the next transverse cut, use the cutter wheel to lift and the spare cutter wheel to fall. In this way, the longitudinal cuts are always parallel to the running direction of the glass, and when the deviation is tracked, no waste sheets are produced, and the yield is improved.
4. Two cross-cut bridges. When the glass plate is long, one bridge can be cut. If the glass plate is too short, two bridges need to be cut at the same time. The cutter wheel is driven by the cylinder, the proportional electromagnet is pressurized, and the cutting pressure is easy to control and adjust. When the glass belt is deflected, it can start tracking according to the signal provided by the edge detector, changing the position of the falling and lifting points.
5. The main break roller is used to cut off the continuous cut glass, accelerate after the break, and quickly send out the broken glass. Here, we should pay attention to the time adjustment of the cutoff and acceleration, and then cut off and then accelerate.
(5) Clearing machine. The edge-clearing machine is used to clear the edge cut by the slitting bridge. The clearing machine roller and the clearing wheel can realize automatic tracking. When the glass plate appears, the edge cleaning machine will move according to the position of the plate. The edge of the clearing roller is made larger by making the blade mark of the glass larger, so that the edge is not damaged without burrs.
(6) Vertical and vertical division. The longitudinal longitudinal division is used for the division of the plate width, that is, the longitudinal cutting knife first cuts the size, and the longitudinal direction can be freely moved. According to the position value received by the longitudinal cutting tool to the specified position, the solenoid valve controls the cylinder when the glass passes over the vertical top. Vertical top lifts separate the glass along the tool marks. At this time, the glass is only split, but the two pieces of glass are still very close. At this time, the longitudinal division plays its role. The longitudinal division is actually four eight-shaped rollers, which are at an angle between each other. When the glass passes, the separated glass will be added. Great distance.
(7) Powder spraying machine. The powder spraying machine is used for spraying anti-mildew powder on glass. The original glass sheets are piled up for a long time. If there is no isolation layer or preservative, it will also be damaged. Therefore, the dusting machine also plays an important role here. The more important thing is to pay attention to the fact that it is easy to block the pipeline when recycling the powder. The recycled powder should be filtered before use.
(8) Rotating table. The function of the rotary table is to rotate the glass by 90 degrees when it is longer than the width and not used for vertical stacking. A reflection sheet is mounted on the lower side of each corner of the rotary table, and a photoelectric switch is fixed directly below one of the corners. The photoelectric switch functions as a protection. When the photoelectric switch is aligned with the reflection sheet, the rotary table can be raised and lowered. Protect the rotary table. If the rotary single is turned on but cannot be rotated, start with two points. 1. Observe whether the photoelectric switch is aligned with the reflective sheet. 2. There are two proximity switches at the lower motor of the rotary table to detect whether it reaches the upper or lower position.
(9) Stacking machine. The stacking system is a relatively independent system with its own separate PLC control. Its role is to box the cut glass. The stacker consists of three parts: the boom, the pull cart, and the rotating stage. The working process is as follows: when the car starts, it stops after hitting the photoelectric switch; when the glass goes under the stacker, after the belt is lifted and positioned, the wire control will give the stacker a ready signal, and the stacker will receive At this point, the boom begins to move (downward). When the boom hits the glass (ie, the lower point of the mechanical position of the boom), the solenoid valve that controls the vacuum opens, and the suction cup begins to absorb the glass. The arm slowly lifts up to the side of the car and stops at the larger mechanical position on the side of the car. At this time, the car advances and stops when the compression amount of the encoder is the set value, and starts blowing (linear encoder is used for the front piece) Glass positioning), after each pile of cars, the corresponding distance back.
(10) Roller path. The control of the roller table is one of the important controls of the cold end. In the PLC, the position of the glass is given by the analog signal, and all the start and stop are quite difficult.
Second, the network composition in the production line
(1) The overall network. The entire network is divided into three layers. Among them, the upper computer and the PLC communicate through Ethernet or optical fiber, and the I/O ports communicate with each other through profibus, and the I/O ports communicate with the field devices through ordinary multi-core cables.
(2) Main line network
The network is mainly composed of two fiber ring networks. One ring network is composed of four SWITCHs. The upper computer and server connected to the fiber ring network are used for main line PLC, HMI, Touch Panel, PPC, Stacker, FNC, FSE, etc. Communicate. One of them is RM (redundant manage). In a fiber ring network, the switch can send data from which side, but it cannot be sent from both sides to avoid an infinite loop. Therefore, there must be a redundant manage switch in the fiber ring network. The other fiber ring network consists of two SWITCHs, which are used for communication between the main line PLC and MOVIPLC. The two ring networks are connected by Ethernet, which is only used for PG access to the network, and there is no real between the two rings. Data transfer.
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