crane rail installation is very important step in crane installation and it’s also the first step.Dongqi Group crane machine introduces you the process of crane rail installation.
Crane rail center
Confirm the center point of the track beam and use the theodolite to dot in the track beam. And then release a baseline of installation, with a steel ruler to measure the span of the crane, release another baseline of installation on another rail beam.
Crane selection and welding of press plates
According to the requirements of the drawings, the use of welded rail fasteners, base, platen and adjustment plate for the Q235 or Q345 steel castings, bolts 8.8; fixed base and crane beam welding, electrode selection and connection material to adapt. Such as the use of Q235 or Q345 steel were used E4315, E7015 type electrode.
Crane rail lifting
Rail lifting can be based on the lifting environment, location, weight, the use of steam hanging to the scene hoisting, unloading the pad to sleep, so that the track stand, to avoid deformation.
- lifting weight = weight per track + hook weight + rope weight
- lifting height = rail elevation +1.5 meters
All rails must be lifted from the inside of the plant.
Crane Rail adjustment
With the top of the jack or crowbar at the beginning of the first adjustment to the required value after the fixed, and then use the ruler in accordance with the gauge value of the other side of the track, the same method. After the rail is correct, all the connecting bolts should be tightened.
Construction Technology of Rail Welding Joint
Rail welding joints require rail layout in the same workshop corresponding to the location of the rail should be staggered, the staggered distance should not be equal to the distance between the front and rear wheels.
Control of rail welding deformation
In the process of welding the rail joints will be bent down, pre-use of copper and steel plate to the rail end pad from 40-60 mm, the use of a good bolt and pressure plate and other connectors to tighten the nut so that the rail fixed to the crane On the beam, there should be at least 4 fixed points near each rail joint. When the bottom part of the end of the welding, release the pressure plate, the rail end of the pad from the height
Down to 10 mm, and then tighten the plate nut. When the rail waist part of the welding, remove all the plates and release the pressure plate, then the rail joints should have a small on the value of the welding process in the welding head, according to the rail to restore the straight, to decide whether to tighten Platen nut. In all the welding process, at any time with a straight steel plate to check the deformation of the rail joints, at any time to adjust the joint height of the pad and the elastic plate to control the welding deformation of the rail joints. Fixed steel rails in the welding head, the two rails between the end of the width is narrow, to the bottom of the gap as a standard, not less than 12 mm is not easy too wide, generally controlled in the range of 12 ~ 14 mm.
Preheating and tempering
Preheat and tempering is used ordinary gas welding nozzle, waist and bottom of the repeated heating. Two rail ends of the preheat range of 20 to 30 mm, preheating temperature of 250 ℃ or so. Rail welding joints of the tempering temperature of 600 ~ 700 ℃, from the weld center on both sides of the 40 mm or so as the scope of tempering treatment. Tempering temperature to meet the requirements immediately after the use of asbestos-containing insulation box wrap, so that slow to room temperature, easy to disassemble the light insulation box can be an asbestos floor and two wooden side panels combined.
Welding work
Each welding a rail joint, need welders and cleaners a total of two people with the gas welder only in the preheating and tempering before entering the field work. The welding quality is good and the cleanliness of the slag is the determinant of the quality of the welded joints. The order of the welded rail joints is from bottom to top, the first rail bottom rail, rail head, and finally patched around. Welded copper mats for welding rails plate and welding rails, rail head with the red copper plate and red copper pallets. Red copper plywood and red copper plate width of 80 mm, the thickness of about 10 mm, curved shape should be consistent with the shape of the rail.
Crane Grinding treatment of rail welded Joints
After the rail welded joint has been tempered and cooled to the atmospheric temperature, the top and side welds of the rail head should be polished. When the weld protrusion is too large, you can first use a flat shovel to eliminate part of the welding wave, and then use the electric hand wheel grinding the grille to the head with the flat head, and finally with a rasp or sandpaper to smooth the surface, big nicks.
If your company have need about cranes and hoists,Dongqi group are here for your need.
没有评论:
发表评论