Hammer Tie Rod Assembly Using Jack Bolts for High Clamp Load
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Solution Overview
Problem
Existing methods for assembling hammer tools face challenges in achieving high torque values required for clamping tie rods, which can lead to damage in the threading of nuts or collars, affecting the clamp load.
Innovation Solution
A method involving a collar assembly with a first collar and fasteners, which is threaded onto a tie rod to stretch it and transfer the clamping load to a second nut, allowing for easier tightening with less torque initially and subsequent transfer of the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high torque values are applied to tighten nuts or collars on tie rods, then the desired clamping load is achieved, but the threading of the nut or collar is damaged
Solution Approach 1:
The patent applies preliminary action by first stretching the tie rod to the desired clamping load using a hydraulic stretching device before tightening the nut or collar. This preliminary stretching establishes the required force state, allowing the subsequent nut tightening to occur at lower torque values that do not damage the threading, while still achieving the desired clamping load through the pre-stretched tie rod configuration
2Force
If high torque values are applied during assembly, then the desired clamping load is achieved, but the assembly process becomes difficult and dangerous
Solution Approach 1:
The hydraulic stretching device performs the preliminary action of stretching the tie rod to the required clamping load before the nut tightening operation. This eliminates the need for operators to apply dangerous high torque values during assembly, as the stretching is accomplished through controlled hydraulic pressure rather than manual or mechanical torque application
Solution Approach 2:
The patent replaces the traditional mechanical torque-based tightening system with a hydraulic stretching system. Instead of using torque wrenches or impact tools that require operators to apply high mechanical forces, the system uses hydraulic pressure to stretch the tie rod, substituting a controlled fluid pressure system for the dangerous high-torque mechanical operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the achievement of high clamp loads with reduced initial torque requirements, preventing damage to threading and ensuring consistent clamp loads across tie rods.
Implementation Method 1
stretching a stud of a hammer assembly by tightening, according to a preset amount, a plurality of jack bolts, which extend from a first end surface of a first nut threadedly coupled to the stud, to press against an upper surface of a body of the hammer assembly
Data Source
AI summary
Systems and methods can include stretching a stud of a hammer assembly by tightening, according to a preset amount, a plurality of fasteners, which can extend from a first end surface and/or a second end surface of a first nut threadedly coupled to the stud, against an upper surface of a body of the hammer assembly. The fasteners and the first nut can provide a clamping load for the stud upon completion of the tightening. The systems and methods can also include, after the stretching, tightening a second nut, which can be threadedly connected to the stud, toward a seat formed in the body of the hammer assembly; and further tightening the second nut, against the seat. The systems and methods can further include transferring the clamping load from the fasteners and first nut to the second nut.