Fix the unthreaded end of the countersunk bolt of the expansion bolt to the top plate, and ensure that the center line of the countersunk bolt and the midpoint of the top plate coincide. The top plate can be made into different shapes as needed, and if it is supported by a steel pipe, it can be formed into a groove shape. Be careful not to allow the bolt to rotate with the nut. The hexagonal head screws are respectively welded to the sides of the hex nut. It should be noted that the solder joints here are small, but the soldering must be firm, because the solder joints are subjected to a large shear force when supporting heavy objects. If a suitable screw can not be found at the moment, the steel bar can be used instead, but the actual use of the screw is obviously better than the steel bar, and there is no need to polish too much, and the hand feels better when rotated. Grind the solder joint, base and top plate with a Grinder or angle grinder to avoid hurting your fingers during operation.
If you want to use it multiple times or the weight of the support is large, you can quench the screw nut and the expansion tube. It should be noted that the heating of the screw and the nut should be evenly heated, and the temperature should not be too high, so as to avoid damage to the wire. Finally, apply some lubricating oil to the countersunk bolts and nuts. Screw the nut onto the bolt and insert it into the expansion tube. Place a flat washer between the nut and the expansion tube. After completing the above process, a simple and practical screw jack is ready. When in use, the top plate is placed in the groove of the channel steel. If the height difference is too far, the wood brick can be placed under the bottom plate. After adjusting the channel steel and adjusting the hex nut, the elevation of the channel steel can be adjusted. Therefore, the hex nut rotates once a week, which greatly reduces the number of adjustments and level readings, and significantly improves work efficiency. In addition, different sizes of screw jacks can be made with different sizes of expansion bolts to meet the working needs of different components, so other materials need to be adjusted. The method of use and production is similar, the only thing that needs to be noted is that the bolt pitch is different.
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