6results about How to "Avoid equipment" patented technology

The invention belongs to the technical field of preparation of isocyanate, and particularly discloses an isocyanate preparation method based on a rare earth upconversion material, which comprises the following steps: mixing and dissolving rare earth metal salt and ligand in absolute ethyl alcohol or anhydrous ethylene glycol, and performing solvothermal reaction to prepare rare earth nanoparticles; and calcining the prepared rare earth nanoparticles at 450-550 DEG C to obtain the rare earth up-conversion material. The preparation method comprises the following steps: adding the rare earth up-conversion material into a solution of an organic amine compound, and carrying out photocatalytic oxidation reaction under the irradiation of near-infrared light, so as to prepare the isocyanate, wherein the mass percent of the rare earth up-conversion material in the organic amine compound is 1-10%, and the mass percent of the rare earth up-conversion material in the organic amine compound is 1-10%. Through the light conversion characteristic of the rare earth upconversion material, the isocyanate reaction is smoothly carried out under the excitation of low-energy near-infrared light, and the method has the advantages of mild reaction, low equipment requirement, high efficiency and the like.

The invention discloses a device and a method for treating biomass and separating lignin through electrothermal coupling dilute alkali, and belongs to the technical field of biomass resource utilization. The device comprises an electric heating reaction unit, a time-varying magnetic field in a magnetic core in the electric heating reaction unit serves as an excitation source to spontaneously induce an electric effect and a heat effect on reaction feed liquid in a reaction tube, and electric heating coprocessing is completed. The method comprises the following steps: mixing a wood fiber raw material with a dilute alkali solution, and then carrying out electric heating pretreatment by using the device disclosed by the invention; a large amount of lignin and a small amount of hemicellulose in the wood fibers can be removed through electrothermal coupling dilute alkali pretreatment. The energy loss of traditional hydrothermal treatment is reduced, the wood fibers are pretreated by means of the electric effect, the pretreatment temperature is reduced, and the requirement for equipment or devices in the high-temperature and high-pressure environment is avoided.

The present invention relates to a pneumatic control device of a series-parallel structure composed of four solenoid valves, including: solenoid valve A, solenoid valve B, solenoid valve C, solenoid valve D, four air locks, a pressure transmitter, a connecting joint and a connecting pipeline; a filter pressure reducing valve is arranged behind an air source, and the air passage behind the filter pressure reducing valve is divided into two ways, respectively connected to one end of two air lock valves, and the other ends of the two air lock valves are respectively connected to the air inlet of solenoid valve A and the air inlet of solenoid valve C. The beneficial effects of the present invention are as follows: the pneumatic control device provided by the present invention can be used for the series-parallel redundant control of four solenoid valves, and the four-way solenoid valves can be independently configured with air sources and power supplies, which are more reliable; the problem of low reliability of existing single solenoid valves is overcome; the malfunction of a single solenoid valve causing a shutdown event of a certain device or system is avoided; the probability of solenoid valve refusal to operate can be reduced; the pneumatic control device is convenient to combine, the process is simple, and the circuit is reliable.

According to the radio frequency device behavior model parameter extraction method based on transfer learning, the polynomial model coefficient is extracted through the neural network model, the data size needed for building the neural network model is reduced, the portability and optimization efficiency of the model are improved, seamless integration of the neural network model and EDA software is achieved, and the performance of the neural network model is improved. The progress of the electronic design process is accelerated; the neural network model uses the test model in the old working state as the starting point of the new working state, so that the model coefficient is prevented from being re-extracted, and the test time and the instrument cost are saved.

The invention discloses a heat pump system which comprises a compressor, a heating heat exchanger and a refrigerating heat exchanger, the compressor, the heating heat exchanger and the refrigerating heat exchanger are connected in series, the heating heat exchanger is connected with a heating working medium pump and a heating buffer water tank, and the refrigerating heat exchanger is connected with a refrigerating working medium pump and a refrigerating buffer water tank. And the heating buffer water tank and the hot and cold buffer water tank are simultaneously connected with the air disc application assembly. And a four-way valve structure is cancelled, and during mode switching, through component control of a working medium side and continuous operation of a refrigerant side, the structure of the refrigerant side is simplified, the operation reliability of a host is improved, and the heat exchange efficiency is improved.

This utility model relates to a linear motor direct drive worktable with a safety protection device. The utility model includes a linear guide rail mounted on the machine tool bed; a worktable body with a slider slidably connected to the linear guide rail at its bottom; a linear motor including a primary and a secondary component, the primary component mounted at the bottom of the worktable body and the secondary component mounted on the machine tool bed; a linear encoder ruler mounted on the machine tool bed and extending along the sliding direction of the worktable body; an encoder ruler reading head mounted on the worktable body corresponding to the linear encoder ruler; a first and a second limit buffer device, respectively mounted on the machine tool bed and located on opposite sides of the worktable body's moving direction; and a braking device mounted on the slider. This utility model achieves high-speed, stable, and safe linear motion of the worktable.