Urbanisation has historically led to issues with property damage and sickness, due to pests such as rats. Traditionally, rats have been exterminated using poison and manually loaded traps. As of late however, more effective and humane means of control have been developed, such as automatic and connected traps. As rats use the sewer system as we use the highway, connecting properties together, it is natural to place traps there. Nomor, a service company that performs pest control among other services, is interested in developing their own automatic mechanical sewer mounted trap for their own specific needs. In this thesis, the fastening mechanism and enclosure for such a trap are developed, with a concept developed in a previous collaboration used as a base. In this concept, a fastening mechanism is used to fasten the trap to the open pipes located in the sewer manholes. Rats passing underneath the trap are executed by the striking of a carbon dioxide driven cylinder. The enclosure surrounds the fastening mechanism and provides an interface between it and the executional unit, which is developed separately. The final prototype, which was made mostly using 3D-printing of PLA parts and some light metalwork, was tested and evaluated using a testing rig made from layered MDF pieces. The rig was constructed with an optimal scenario in mind, with dimensions like those in pipes which Nomor are likely to want to mount the trap in. The main use of the rig was to evaluate the dimensions and fastening abilities of the trap. Tests and analysis of the construction gave that the fastening mechanism and enclosure had potential to meet the requirements from Nomor in a reliable manner, if a more sophisticated method of mounting and a better mechanism for keeping the trap fastened was developed.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:liu-177472 |
| Date | January 2021 |
| Creators | Jonsson Dahl, Linus, Appelqvist, Martin |
| Publisher | Linköpings universitet, Maskinkonstruktion |
| Source Sets | DiVA Archive at Upsalla University |
| Language | Swedish |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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