What are the main daily inspection items of corrugated rollers in the cardboard production line of the cardboard production line?
Corrugated roller is a key functional part of the cardboard production line. It completes a complete process of forming, sizing, and compound drying in the production of two-layer corrugated cardboard every week of work. Corrugated rollers are also expensive and vulnerable parts of cardboard production lines. The normal production process of cardboard is also the normal wear process of corrugating rollers. Therefore, in addition to the use of corrugating rolls with high quality, high precision, and good wear resistance, improving the environment and conditions for the use of corrugating rolls and the correct and timely maintenance of the corrugating rolls are two important issues in improving the service life and economic performance of corrugating rolls. factor. The main technical indicators of corrugating rollers have been clearly specified in the national standard GBi2070-89 ( middle and low-speed corrugated board production lines ) . For corrugating rollers at 120m / main or more, the high speed corrugated board production line with, and its technical indicators must be further improved, especially in a high-speed corrugating roller must also have excellent properties of the material selection, the use of advanced heat treatment Process performance, reasonable crucible design, reliable manufacturing accuracy, and excellent wear resistance of the surface plating layer, etc., can meet the need for high-speed production of corrugated board production lines. Professional corrugating roller manufacturers should provide customers with detailed technical data and test reports. The following describes the main inspection items during the use of corrugating rollers.First, inspection items for corrugating roller installation and debugging:
1 . Pre-installation inspection items:
(1) Clean the inspection of the surface of the corrugating roller ( including the surface plating quality ) .
(2) Wash and inspect the fastening parts ( including internal and external threads ) of each connection .
(3) Check the outer diameter and middle height of the corrugating roller (the entire roller surface is divided into more than five measurement points from both ends to the middle. The detection point of the middle-high roller must be odd, and the middle and high data should be symmetrical on both sides ) . Measured with the outer diameter micrometer of the corresponding specifications ( outside micrometer can be purchased by general electromechanical company ) .
(4) Check the height of the corrugating roller. Needle depth dial indicator Measurement (needle depth dial indicator temporarily country did not sell - shall mouth or use of ordinary dial indicator of the depth of the restructuring.).
(5) Cleaning Check the outer diameter dimensions and appearance of each corrugating roller shaft. The outer diameter size is measured with the outer diameter micrometer of the corresponding specification. 2 . Check items during installation and commissioning:
(1) Check the parallelism of upper and lower corrugating rollers ( usually the corrugating roller in contact with the pressure roller is not mid-height and is the mounting reference roller. The corrugating roller with middle height has an eccentric adjustment mechanism which can be adjusted to parallel between the two rollers ) . It can be judged and adjusted with pressure-sensitive paper, carbon paper or fuses, and cardboard dents and indentations.
(2) Check the parallelism of the upper and lower corrugating rollers and the pressure roller. During the operation of the upper and lower corrugating rollers and the pressure roller, it is required that the axes of the three rollers be parallel and the line pressure be uniform. Based on the indentation of the composite two-layer corrugated cardboard, the pressure can be adjusted separately.
(3) Check the parallelism of the corrugated roller and adhesive roller, according to different requirements of the corrugation gaps amount of glue, the detection feeler and adjusted to a consistent gap between the corrugating roller and the glue roll (typically metal organic departments Can buy a feeler gauge ) .
(4) Check and adjust the relative positions of corrugating roller and paper guide copper plate device, positive pressure paper guide device or negative pressure paper guide device, and adjust according to the adjustment requirements of different paper guide structure production lines to ensure the corrugated paper after ironing. The process of sizing and compound drying can be completed on the corrugating roller.
(5) The respective limit devices must be fixed after the above items are commissioned.
(6) The bearings of corrugating rolls, pressure rolls and other rolls must meet the requirements of precision, high-temperature grease must be of high quality, and the seal must be well sealed. Second, daily inspection items for corrugating roll normal production and operation:
1 . Before running production:
(1) Check and ensure the cleanliness of each roll surface.
(2) Check and ensure the correct position of each roller.
(3) Check and ensure that the relevant device - ( paper guide copper device, positive pressure guide device or negative pressure guide device, etc. ) is in the correct position, check the wear and adjust it well.
(4) Check and ensure the correct position and adhesion of the gluing system The good preparation of the mixture.
(5) Check and ensure that each lubrication oil is ready for normal operation.
(6) Check and ensure that the air pressure and hydraulic system are normal.
(7) Check and ensure normal heating system.
(8) Check and ensure the power supply electrical control and mechanical transmission The system is normal.
2 . Operation in production:
(1) Check and control the temperature, steam heating to prevent the discharge of condensate is not smooth, and the pipeline valve runs dripping, inspection and guarantee steam supply pressure.
(2) Check and control the humidity of the corrugating medium and face paper.
(3) Check and control the correct operation position of the corrugating medium and face paper, and the edges of both ends are neat.
(4) Inspection and control of corrugated sheet forming accuracy of corrugated board, no high and low blemishes and collapses and fungus edge phenomenon.
(5) Check and control the composite strength of the corrugated core paper and face paper and the uniformity of the sizing.
(6) Check and control the indentation on the surface paper light and even.
(7) Check and control the glue supply system circulation.
(8) Inspection inspections to ensure the smooth operation of the machine and no abnormal impact noise.
(9) Inspection and inspection Each lubrication system is guaranteed to work normally.
(10) Inspect the air pressure and hydraulic system to ensure that the work is normal and no leakage occurs in the pipelines.
3 . When stopping production:
(1) Close the roller heating system.
(2) Close the pressurized air cylinder and hydraulic system.
(3) Stop the circulation of the glue, and remove the gluing system from the corrugating roller.
(4) When the corrugating roller is cooled down to below 40°C , the corrugating roller will be stopped and the paper wastes in the roller surface, paper guide copper plate and positive pressure or negative pressure device will be cleaned up.
(5) Do a good job of lubrication and refueling. Third, the main environmental conditions affecting the life of the corrugating roller:
1 . Product impact:
(1) Corrugated paper containing sand, the greater the sand content, the greater the abnormal wear of the corrugating roller.
(2) Corrugated paper type and paper thickness ( gram weight ) . The smaller the cocoon type and the thicker the paper thickness, the faster the normal wear of the corrugating roll.
(3) Frequently produced paper webs ( wide and narrow production ratios ) produce more in narrow widths, causing corrugating rollers to wear unevenly and concave. Conditions should be as narrow as possible by the production of corrugated rolls.
2 . Equipment impact:
(1) Influence of the speed of equipment operation. The normal wear of the corrugating roller at high speed is faster than that at low speed.
(2) The influence of the rigid quality of the equipment is that the rigidity is not enough and the vibration is severe, which will cause abnormal wear of the corrugating roller.
(3) The influence of the processing precision of the equipment, the processing accuracy is not enough, so that the corrugating roll does not operate normally and is severely worn.
(4) The accuracy of parts and transmission components is not enough, causing abnormal wear of corrugating rollers.
3 . Human factors:
(1) The alignment of the roller axis is not parallel, causing partial wear of the corrugating roller.
(2) The pressure is too large or uneven, causing the corrugating roller to wear excessively or suffer from uneven wear.
(3) There is no pressure relief when the corrugated roller is running, causing unnecessary friction and wear of the corrugated roller.
(4) Failure to properly lubricate the shaft of the corrugating roller causes abnormal wear on the roller surface.
(5) The foreign body is indented on the surface and the bad teeth of the roller surface of the corrugated roller are rolled.
(6) When grinding the ends of the corrugating roll with emery grinding to reduce the concave, the running-in breaks the cylindricity and corrugated type of the roll. The above are the general principles of correct use and daily maintenance of quality corrugated rollers and the basic environmental conditions that affect the service life of corrugating rollers. In the corrugated board production industry, many companies have accumulated good scientific management experience worth learning and promotion. For example, Shanghai United, Shanghai Asia Paper, Dalian United, etc., can exchange ideas with each other. As long as in the daily production process and production gap, constantly monitor and improve the use of corrugated roller environment and the use of conditions, scientific and serious rigorous daily maintenance work, corrugated roller will be a high production and low consumption of corrugated board manufacturers Play its due role
