The purpose of the expansion and contraction of the adjustable nut is adjusted by adjusting the position of the adjustable nut on the stud. At the same time, in order to prevent the position of the adjustable nut of the adjusted length from changing, the adjusted nut is locked with the nail wire at the position adjusted by the stud. The lower end of the fixing nut is milled into a quadrangular prism, which can be matched with the mounting hole of the beam, thus preventing the nut from rotating with the telescopic bolt when tightening the bolt, so as to achieve the purpose of tightening the bolt. 2 working principle of the telescopic mechanism The specific operation is as follows: the depth value of the recess of the mounting hole is measured by a mounting rod (a long plastic rod with a scale of 6 mm and a length of 600 mm), and the specific measuring method is to push the bolt mounting mechanism to the object to be mounted. Next, the cleaned mounting rod is passed through the hole of the object to be bolted, and is in contact with the nut mounting on the beam of the bolt mounting mechanism, and the measuring rod is rotated from the upper surface of the mounting hole to read the mounting rod on the object. The scale of the face, the measured scale minus the thickness of the object at the mounting hole and the height of the fixing nut are the depth values ​​of the recess of the mounting hole, and the position of the limit nut on the screw is adjusted to make the position between the limit nut and the nut mount The distance between the screw length and the nut seat is just less than the measurement length of 3 to 5 mm. The purpose is to facilitate the installation of the retractable nut seat on the beam, because the beam of the bolt mounting mechanism can be raised in the range of 0 to 8 mm. After adjusting, use a screw to restrict the rotation on the screw through the groove on the screw, then screw the nut seat on the screw, and touch the side of the metal nut to the nut seat. In case the nut is dropped due to the inclination of the screw installation, when the bolt is screwed, since the screw is installed in the beam hole with the limit nut, the screw restricts the rotation of the screw in the limit nut, and since the screw is a hollow stud, Affect the length of the bolt, so the bolt can only be tightened in the nut. 3 correct use of the telescopic mechanism In order to use the telescopic mechanism correctly, the following points should be made: 1 Before installing the bolt, the proper sleeve should be correctly selected according to the diameter of the bolt to be installed; 2 When the actual length of the telescopic calculation is calculated after the measurement, it is installed for installation. The convenience of the nut allows the retractable mechanism to be mounted on the bolt mounter. The upper end of the sleeve should have a clearance of 2 to 3 mm from the mounting hole. 3 In actual installation, in order to improve the installation efficiency, before the pedal is stepped on, The measuring rod first protrudes from the mounting hole and is placed in the hole of the mounting nut, and then the foot pedal; 4 before using the wrench on the mounting hole, first step on the foot pedal with the foot and lightly screw the bolt by hand to ensure After the bolt is properly screwed into the nut, press the foot pedal hard, when the hand is not tightened; then tighten with a wrench; 5 when stepping on the foot pedal, be slow, avoid excessive force and shear the pin weakened joint structure axis. 4 Conclusion In order to ensure that the rotating parts of each mechanism are flexible, it is necessary to regularly inject lubricating oil into the zero-turning parts and parts. When the adjustable nut is locked by the top wire, in order to prevent the top wire from wearing the thread on the screw, the hardness of the bolt can be lower than that of the bolt. The top wire or the aluminum top wire; at the same time, in order to align the mounting nut to the mounting hole as soon as possible, the adjustable length of the retractable nut seat can be placed on the mounting nut, and then the mounting rod is inserted into the screw hole of the retractable nut seat. By stepping on the pedals, you can save a lot of auxiliary time wasted by the holes and improve labor efficiency.
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