The submarine hose plays a vital role in the single-point mooring system and is a necessary channel for medium transportation. Once crushed under the load of the seawater external pressure, it will cause oil and gas leakage and major safety accidents. It is a composite hose composed of a rubber layer, cord layer and steel helix wire, of which the steel helix wire plays an important part in bearing mechanical properties. In this work, python language was used to model the submarine hose parametrically, the finite element (FE) analysis software ABAQUS was utilized to analyze the ultimate bearing capacity of the hose under uniformly distributed external pressure loads and the influence of the initial ovality of the submarine hose, the diameter and pitch of the helix wire, the yield strength of the helix wire material on the ultimate bearing capacity of the submarine hose were studied. Through a large number of FE results, the ultimate bearing capacity of the hose was obtained by fitting the prediction formula.

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Automatic Guided Vehicle (AGV) is a kind of driverless transport vehicle which can carry, store, and load and unload goods. It can follow the preset path, complete the task, and has the functions of obstacle avoidance and safety protection, which is widely used in automatic production system. This paper introduces the design and development of AGV trolley to realize the automatic production transformation of drip irrigation belt production line for agricultural irrigation. According to the design requirements of the drip irrigation belt rolling AGV trolley for the transformation of the production line, based on the previous design experience and technology of the automatic guided trolley, from the actual needs of engineering application, combined with the path guidance technology, embedded control system, sensor detection technology, module control and system control management technology, a tape guided AGV trolley with lifting module is designed, which realizes the functions of rolling, transporting and storing of drip irrigation belt, and the production efficiency of drip irrigation belt is improved.

With the increasing application of PVC water supply pipe in production and life, this paper aims at the problem that there is no single sealing ring connected large diameter PVC pipe interface sealing detection equipment in the construction site of agricultural water supply. According to the sealing test method of negative pressure test, a set of large diameter PVC pipe interface sealing test device is designed, and the corresponding test procedures and standards are put forward. The field sealing test of large diameter PVC pipe interface is carried out, and the portable aviation aluminum box with universal wheel is designed and customized. The device has the advantages of simple structure, easy installation and disassembly, easy carrying, and is suitable for field operation. It provides important equipment support for the better promotion and use of large PVC pipes.