Abstract: A constant value method for detecting and evaluating internal leakage in a hydraulic cylinder and a detection device. The method comprises: step (1) measuring an accurate pressure drop value ?p of the internal leakage in the hydraulic cylinder; step (2), determining whether the detected hydraulic cylinder meets a standard: if the product of the accurate pressure drop value ?p of the internal leakage in the hydraulic cylinder and a corresponding hydraulic stroke L, is less than a standard parameter C for evaluating the internal leakage in the hydraulic cylinder, C = 4 ? QtK ? ? D 2 , the internal leakage in me hydraulic cylinder meets the standard. Otherwise, the internal leakage in the hydraulic cylinder does not meet the standard. The detection device comprises a motor, a hydraulic pump, a directional valve, a detected part, a pipeline disassembly joint and a pressure sensor.

Abstract: Provided is a dynamic characteristic measurement method for a cylinder block of a non-intrusive axial piston pump. The cylinder block is the main rotating component of the axial piston pump, and the dynamic characteristic of the cylinder block is more capable of reflecting the health condition of the pump than an external characteristic. A non-contact type measurement scheme is provided so as to reduce the influence of a measurement device on the motion of the cylinder block. Cylinder block contour signals and radial displacement signals are obtained by measuring the radial displacement of two sections of the surface of the cylinder block under different working conditions in the perpendicular directions, and then the cylinder block contour signals are accurately removed from the radial displacement signals to obtain the translational and tilting motion characteristics of the cylinder block.

Abstract: The present invention relates to use of a quaternary ammonium salt-type anthraquinone-based active material, and a salt cavern organic aqueous redox flow battery. The quaternary ammonium salt-type anthraquinone-based active material is used as a negative active material in a salt cavern battery, and a quaternary ammonium salt group is introduced, which can improve the solubility of anthraquinone in a neutral sodium chloride solution, thereby increasing the energy density of the battery. Also, the material has a relatively good stability, without the need for charging and discharging under the protection of an inert gas environment.

Abstract: The present invention relates to use of a quaternary ammonium salt-type anthraquinone-based active material, and a salt cavern organic aqueous redox flow battery. The quaternary ammonium salt-type anthraquinone-based active material is used as a negative active material in a salt cavern battery, and a quaternary ammonium salt group is introduced, which can improve the solubility of anthraquinone in a neutral sodium chloride solution, thereby increasing the energy density of the battery. Also, the material has a relatively good stability, without the need for charging and discharging under the protection of an inert gas environment.

Abstract: The present invention provides a method for synthesizing a carboxy-containing anthraquinone derivative, including the following steps: S1, mixing a terminal carboxy-containing dibasic acid with thionyl chloride, and adding toluene as a reaction solvent, followed by adding a catalyst and heating to a predetermined temperature for a reaction; S2, after the reaction is completed, removing the reaction solvent and the thionyl chloride, followed by adding toluene for distillation, to obtain a reactant; S3, mixing the reactant with aminoanthraquinone, adding toluene as a reaction solvent, followed by heating to reflux for a reaction; and S4, after the reaction is completed, removing the reaction solvent, adding a potassium carbonate solution to the residue, filtering it to remove a solid, adjusting the filtrate to a predetermined pH value to precipitate a solid, followed by filtering out, washing, and drying the precipitated solid, to obtain the carboxy-containing anthraquinone derivative.

Abstract: Disclosed is a method for preparing an organic environment-friendly snow-melting agent by using salt mud from a two-alkali method, relates to the field of environmental protection and resource utilization of solid wastes. The method includes the following steps: first, stirring and reacting an organic acid and the salt mud from a two-alkali method at room temperature to obtain a slurry; filtering the slurry to obtain a filtrate; the filtrate is then concentrated and dried by centrifugal spray drying to obtain a solid powder; granulating the solid powder. The method not only realizes the recycling of salt mud solid waste, but also greatly reduces the production cost of organic environment-friendly snow melting agent by turning waste into wealth, moreover, due to the existence of trace ions, the ability of melting snow and ice has obvious synergistic effect.

Abstract: Disclosed is a method for preparing an organic environment-friendly snow-melting agent by using salt mud from a two-alkali method, relates to the field of environmental protection and resource utilization of solid wastes. The method includes the following steps: first, stirring and reacting an organic acid and the salt mud from a two-alkali method at room temperature to obtain a slurry; filtering the slurry to obtain a filtrate; the filtrate is then concentrated and dried by centrifugal spray drying to obtain a solid powder; granulating the solid powder. The method not only realizes the recycling of salt mud solid waste, but also greatly reduces the production cost of organic environment-friendly snow melting agent by turning waste into wealth, moreover, due to the existence of trace ions, the ability of melting snow and ice has obvious synergistic effect.