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Internship report Huisman

Heijdens, E.J.H. (2015) Internship report Huisman.

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Embargo date:31 March 2065
Abstract:During this internship I worked on several different assignments. The goal of the internship is to gain some practical experience and to see how it is to work as an engineer. The major and most interesting projects are the condition monitoring of a slewbearing, the design of a whip hoist winch frame, writing an Engineering Work Instruction on how to weld a reeving eye to a steel wire and the development of an alternative production method for the transition piece. Slewbearing condition monitoring The PMOC’s build by Huisman are all mounted on a slewbearing. This bearing makes the rotation around the crane’s central axis possible. It enables the crane to shift the load line. These bearings have typically a diameter of multiple meters and are only made on order. This makes them long lead items. Therefore unexpected failure of the bearing will lead to long downtime of the crane. In order to prevent this, the condition of the bearing could be monitored. Monitoring can be performed on several ways. The most used method is the rocking test. In this test the absolute amount of clearance in the slew bearing is measured by rocking it from one side to the other side. The amount of clearance is an indication for the wear. This test can be hard to perform (hard to apply the necessary moment for rocking). The axial reduction method is an alternative method in which no moment is needed. By this method wear is quantified by the change in distance between the raceways. The end result of this assignment is an EWI in which it is clear when to perform condition monitoring and how to do it. Whip hoist winch frame A PMOC is standard equipped with a boom- and main- hoist. The boom hoist is used to position the boom. The main hoist is used to hoist the loads. It has the biggest lifting capacity. Sometimes the crane is equipped with an additional whip hoist. The whip hoist is the one attached to the furthest tip of the crane and has the smallest lifting capacity. For this case the safe working load of the whip hoist winch is 10t. The whip hoist winch frame is mounted on top of the main winch frame and is designed in this assignment. In the main winch frame the boom hoist and main hoist winch are mounted. EWI welded eye In order to increase the lifting capacity of the crane a lot of sheaves are used. During assembly of the crane the steel wire rope is pulled through the entire sheave system. This process is also known as reeving. In order to do this an eye is welded to the steel wire at which a messenger rope is attached. This is usually a thinner synthetic rope which is used as guidance for the steel wire. The force that is acting on the wire depends on the back tension and the number of sheaves. The end result is an EWI in which it is described how to dimension and weld the eye. Alternative production method transition piece The transition piece act as the name already implies as transition between the round shape of the slew bearing and the rectangular shape of the crane house. It is made by forming a flat metal sheet in a specific way. Due to this production process high strains are present in especially the corners of the rectangular. Therefore a high ductile steel is needed which is only made on order. The forming process can only be done within the specifications by two companies located in Germany while the cranes are being built China. This makes it a long lead item. In this assignment an alternative production method is investigated.
Item Type:Internship Report (Master)
Huisman Equipment BV, The Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:Slewbearing, Condition monitoring, Pedestal crane, Reeving, Whip hoist winch
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