Analysis of repair skills of damaged roller

 The new roller should be repeatedly cleaned and shaken before use, to remove residual debris and dust, roller coating flooring is generally to be added to the handle of a suitable length of bamboo poles, wood pad pads long handles, in order to a wider range of coating. The new roller with thinner to clean it, shake dry thinner after dipping the paint construction is better. The process of construction used roller, if you need a short period of time again, can be simply cleaned, soaked in thinner or single-component paint, after the completion of the project, the application of thinner to clean it. Cleaning method is: scrape off the paint with a scraper, etc., epoxy floor paint in the thinner soaked in waste paper and other clean waste rolling, extrusion of paint and thinner, and so on several times, until it reveals the original color of the lint, shaking dry the cylinder sleeve, the lint entangled with each other can be loosened to be stored.
　　Roller is a hollow cylinder, ordinary roller surface paste wool or synthetic fibers made of plush. Ordinary roller sleeve lint length of long, medium, short three specifications. In the long pile roller sleeve attached to the paint more, suitable for rough surfaces, roller coating floor coatings, more than the use of these two types of rollers. There are many types and specifications of roller, shaped roller can be coated into a variety of patterned form of film, such as wrinkled skin anti-slip flooring construction, commonly used in this type of roller construction. If necessary, choose to buy the corresponding roller can be used with ordinary roller similar, not to repeat.
　　Roller coating method: first with the roller 1/3 ~ 1/2 immersed in the prepared paint, rolling on the inner wall of the container, so that the roller soaked in paint, while squeezing out the excess paint. Roll gently according to the W-shape to distribute the paint roughly on the floor, roll the paint in one direction first, and then roll the paint along the vertical direction when the paint on the roller is basically exhausted. Drive the uneven thickness of the paint until the thickness is even. Roller coating the last surface coating, should be in the same direction (such as the direction of light irradiation) roller coating. The requirements for roller coating the floor are: no piles, no leaks, no exposed roller marks and joints.
　　When the roller is worn, the roller surface is not cylindrical, forming a concave profile with two large ends and a small center. At this time, larger mud pieces or mud clusters may pass through the worn notch, and the effect of crushing is not achieved, so the roller needs to be repaired. Roller repair commonly used in two ways: in-situ cutting (grinding) processing repair method and in-situ cladding repair method.
Roller
　　(1) in situ surfacing method
　　In-situ welding is in the wear of the notch for welding filler. This method is simple and practical, does not affect production, and surfacing parts of the hardness and wear resistance are relatively good, the disadvantage is only suitable for good weldability roller (such as cast steel roller).
　　Surfacing should pay attention to the following matters:
　　① should choose a small diameter surfacing electrode, small current welding specifications, layered surfacing. This reduces thermal stress and avoids serious deformation and cracking.
　　② Surfacing electrode selection should be appropriate, in order to use stack 256 and stack 266 is appropriate.
　　③ The hitch of the welding machine should be directly on the roller, not on the shaft, so as to avoid the current flowing through the rolling bearings, generating sparks, so that the rolling body of the bearings and the surface of the raceway burned.
　　In addition, you can also use the method of repair after dismantling, that is, dismantle the roller together with the shaft, and then install it on the machine after turning and repairing.
　　(4) In the process of surfacing, the surfacing parts should be checked frequently with a straightedge sample plate to ensure that the external dimensions are qualified.
　　(2) In-situ cutting (grinding) processing method The operation method of in-situ cutting (grinding) processing method is as follows: In the frame of the double-roll crusher, install a special tool holder, and the trajectory of its movement should be parallel to the axis of the rollers. When repairing, turn on the crusher and use the manual knife feeding mechanism (automatic knife feeding mechanism can also be used if necessary) to cut the rollers.
　　The following points should be noted when applying this method:
　　① Control the movement speed of the roller. The linear velocity of the roller surface should not exceed the permissible cutting speed of the cutting tool, otherwise speed reduction measures should be taken to avoid damage to the tool.
　　② For high hardness rollers, cutting can not be processed, then the grinding head can be used to grind according to the method of cutting.
　　③ The running track of the tool holder is parallel to the axis of the roller, so as to avoid taper after cutting and affect the crushing effect.