knuckle joint in elevator chain
#1

Sir is knuckle joint is used in elevators ...? Also we want materials required for it....also give some reference sir
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#2
A knuckle joint is a mechanical joint used to connect two rods which are under a tensile load, when there is a requirement of small amount of flexibility, or angular moment is necessary. There is always axial or linear line of action of load.


Major components of Knuckle Joints
• Single eye end
• Double eye end
• Knuckle pin
• Collar
• Taper pin / Split pin
• Assembly
Applications
- Elevators Chains
- Valve Rods
- Wire line tool-string
- Windshield wiper
When are Knuckle Joints Used?
- Two or more rods subjected to tensile and compressive forces are fastened together.
- Their axes are not in alignments but meet in a point.
- The joint allows a small angular moment of one rod relative to another.
- It can be easily connected and disconnected.
Materials Used
- 30C8 Steel
- Cast Iron
Companies which manufacture knuckle joints
- Sadhu Engineering Works
- Shenzhen Jiaman Industrial Equipment Co. LTD (China).
- Basant Mechanicals Works.
- & many more.

Reference: http://studentbank.in/report-knuckle-joi...z4H0CXkKcu
Reply
#3

The aim of the present paper is to study calculate the stresses in Knuckle joint using analytical method. Further study in this direction can made by using various directions of the pin and the capacity to withstand load. It is also to be noted that instead of mild steel pin we can also use high strength high modulus steel pin that can further enhance the capacity to withstand higher loads. The shape of the knuckle joint can be changed for improved properties. One can carry out the analysis by changing the shape in the part in the knuckle joint in order to conserve materials and energy. The knuckle joint is proposed to develop in the present study is for an applied force of 25 KN. The diameter of the pin is proposed to be around 23 mm. The material of the knuckle joint is considered as mild steel grade 30C8, in order to do the stress analysis; mesh was developed for the knuckle joint. The mesh consists of 64229 nodes and 4310 elements. ANSYS software was run and the stress contour, displacement contour, strain energy contour were obtained. Based on the ANSYS analysis it shows that a pin of 23mm diameter can withstand a load of 25 kN if we use a factor of safety of 2. Further optimization of the diameter of pin, it depicts that a pin of 12 mm is enough to withstand a load of 25 kN. however if we use a pin of 25 mm the range of pulling load can be enhance to even 80 kN.
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