What does a bolt tensioner look like? What is its structure and working principle?

http://www.nfyyj.com/eWebEditor/uploadfile/20070617230815896.jpg http://www.nfyyj.com/eWebEditor/uploadfile/20070617230914395.jpg 1. Construction and principle: The best way to synchronously stretch bolts quickly and safely is by using a hydraulic bolt stretcher. This device can apply even tension to each bolt over an extended period of time; if the bolts are not properly stretched, they will not function properly and will fail. For connection combinations, an accurate tension combination is key. Hydraulic bolt stretchers reduce this risk in critical connections, enabling rapid, safe, and precise stretching. A bolt tensioner is a tool for installing and removing bolts; it utilizes bolt tensioning technology to achieve simultaneous tightening, as well as the tightening and removal of high-strength bolts (enabling simultaneous compression or separation of the contact surfaces) ； Thrust and tension of various requirements can be provided ； Multiple bolts can also be tightened simultaneously, **improving assembly efficiency. 2. Applications: Hydraulic bolt stretchers come in fixed and variable types, and can be used in reactors, flanges, pressure vessels, compressors, turbines, pipelines, clamping connections, offshore operations, and nuclear power applications.

Reply to 2# Black Gold: I still don’t understand how it’s achieved Neither the construction nor the principle is explained; only the function is mentioned vaguely.

Banban is for sale, one top, learning * now

This post was last edited by Black gold on 2010-9-9 at 17:58. Working principle: The hydraulic bolt tensioner is an advanced tool for tightening and loosening bolts. It utilizes the hydraulic power provided by a hydraulic pressure pump (high-pressure oil pump), and determines the tensioning force based on the tensile strength, yield strength, and elongation rate of the material of the bolts, thereby enabling the tightening and removal of bolts of various sizes. Hydraulic bolt stretchers are particularly suitable for assembling a variety of bolts of the same specification. They revolutionize traditional fastening methods by using pure tensile force to elongate the bolts, without any torsional or lateral forces. A hydraulic system is used to stretch the bolt to the desired load, after which it is mechanically locked onto the fastener, thus completing the fastening process. Instructions for use: 1. The studs have been inserted into the sleeve and held in place by the automatic loading tool. If it is necessary to fix the studs in the product in advance, the automatic loading tool is not required. 2. As the spindle rotates and axial pressure is applied to the fastener (sleeve), the bolt holes and the main body of the fastener (sleeve) move together toward the tightening position, thereby transmitting torque to the studs. 3. Once the end of the release tool comes into contact with the product, it begins to contract; the main body moves out of the tightening position, torque is no longer transmitted to the studs, and the tightening action stops immediately. 4. At the end of the tightening cycle, the spindle retracts, the bolt holes open, releasing the studs, allowing the 100 series stud sleeves to be used with the next set of studs.

Generally, large-diameter studs are more commonly used on high-pressure vessels