Abstract: The present application discloses an injection system for a die casting machine, which includes an accumulator, an injection cylinder, a pressurization cylinder and a valve module connected via an oil pipeline; in a slow injection phase of the injection cylinder, the valve module is adapted for dynamic switching between a phase of an oil pump of the oil pipeline supplying oil alone and a phase of the oil pump and the accumulator jointly supplying oil; in a fast injection phase, a braking phase, a tracking phase and a pressurization injection phase, the oil pump of the oil pipeline and an oil tank form a first A-type half-bridge structure.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.