1. What are the hazards of stretchers?
There is no harm in using it properly.
II. Introduction
Stretcher is an advanced tool for pre-tightening and disassembling bolts in the world. The bolt tensioner is simple to operate, convenient to use and high in safety, and is widely used for pre-tightening large-diameter bolts. Practice has proved that the stretcher has little damage to the equipment, uniform stress on the connecting parts and high reliability of bolt connection. Bolt tensioner is called tensioner for short, which has the functions of bolt fastening and disassembling. Can be widely used in metallurgical mines, petrochemical industry, shipbuilding industry, power system, rolling stock, heavy machinery and other industries. With the help of the power provided by the ultra-high pressure pump and the allowable elastic amplitude of the material, the bolt is stretched in its elastic deformation zone to achieve the purpose of fastening or disassembling the bolt. In addition, it can also be used as a device to apply axial force when jacking interference connection. Especially in the working environment with serious pollution or limited space area, the stretching device is irreplaceable by any other tools, and it is an ideal process equipment for assembly and equipment maintenance of large and medium-sized mechanical products. And the construction efficiency is greatly improved.
Third, the operation method
Preparatory work/about to start work
1) Screw the round nut into the bolt and insert the wrist handle into the wrist hole until it is firm.
2) Insert the tensioner support seat and cover the round nut.
3) Screw the stretching machine into the bolt, and tighten the stretching head with the toggle handle until there is basically no gap between parts.
4) After installation, insert the high-pressure tubing quick connector connected with the ultra-high pressure oil pump into the quick connector on the stretcher.
begin
1) Operate the ultra-high pressure oil pump, input high pressure oil to the tensioner cylinder, the piston starts to work, and the tensioner enters the working state. At this time, attention should be paid to the working pressure of the ultra-high pressure oil pump and the stretching length of the tensioner, which must be controlled within the set range.
2) When the working pressure and tensile length of the tensioner reach the rated value, the ultra-high pressure oil pump should stop working immediately, insert the toggle handle into the toggle hole of the round nut, and toggle the round nut clockwise to make it firmly in place.
3) In use, if the process needs to increase the extension length, after the round nut is fastened in place, the ultra-high pressure oil pump should release the pressure according to the operation procedure, and then insert the toggle handle into the toggle hole of the tensioner piston, and toggle the handle to reset the piston. Then operate according to the above method until the process requirements are met.
cancel
After the stretcher is completed, the ultra-high pressure pump should be depressurized first, and then disassembled. There are two disassembly methods, which can be selected according to the working environment:
1) Use the toggle handle to toggle the stretching head, first drain the oil in the oil cylinder into the ultra-high pressure oil pump to reset the piston, and then disconnect it from the high pressure oil pipe? Quick joint, screw out the bolt of the stretching machine and take out the bearing seat to end the whole stretching process.
2) Disconnect the quick connector connected with the high-pressure oil pipe. First, unscrew the tensioner, take out the bearing seat, loosen the screw on the piston end face with an Allen wrench, then clamp the tensioner in the middle of a vise, slowly tighten the screw, and drain the oil stored in the oil cylinder until the piston is completely reset.
The above is an introduction to the hazards of stretchers. Stretcher itself is a harmless equipment, mainly used to operate some pressure equipment, which can reduce manpower and material resources, and is generally used in some large factories. Stretcher is also very common in our life, and it is a relatively solid and safe equipment. When we use it, we must use it according to the requirements, otherwise it is easy to hurt ourselves because of pressure and pressure.