4results about How to "Clever thinking" patented technology

The invention discloses an upside-down well excavation construction method based on hanging type movable supporting of a formwork supporting system. The upside-down well excavation construction method is characterized by comprising the following steps that S1, the formwork supporting system is prefabricated; s2, a first section of well body and a first section of well wall are constructed; s3, earth excavation under template in-situ support is conducted, specifically, after concrete of the first section of well wall reaches initial set, excavation of the second section of well body and the second section of well wall is directly conducted, and a template supporting system is not dismantled; s4, synchronous construction of steel bar binding and movable supporting is conducted; s5, concrete pouring is conducted, specifically, concrete pouring construction of the second section of well wall is conducted; and S6, the step S3, the step S4 and the step S5 are cyclically repeated until the designed position of the bottom of the upside-down well is reached. The problems that in the excavation and support construction process of the upside-down hanging well, due to the fact that a formwork and a supporting system are repeatedly dismantled and lifted up and down for multiple times, excavation and support cannot form synchronous line production, and the construction period and construction safety cannot be guaranteed are solved.

This utility model belongs to the technical field of marine oil and gas and power development equipment, and discloses a vibration damping device for marine risers and submarine cables. The device includes a damping cylinder, a positioning component, a support rod, a sleeve half-ring, bolt holes, and bolts. The damping cylinder is rigidly connected to the sleeve half-ring via the support rod and consists of two symmetrical half-cylinder structures, which are bolted together and fitted around the marine riser or submarine cable. The positioning component can be quickly installed and removed, providing reliable axial positioning for the vibration damping device. This utility model achieves efficient vibration reduction based on the synergistic mechanism of added mass efficiency and hydrodynamic damping energy dissipation. It has a simple structure, convenient and diverse installation methods, and is unaffected by ocean current direction or component attitude, making it widely applicable to vibration control of marine pipelines.

The application discloses an LDO circuit for offsetting parasitic resistance voltage drop, which is characterized by comprising an operational amplifier unit, a current sampling unit, an error amplifier unit and an output unit; wherein the operational amplifier unit is connected with the error amplifier unit, and is used for coupling a sampling voltage to a reference voltage and inputting the sampling voltage into the error amplifier unit; the current sampling unit is connected with the operational amplifier unit, and is used for feeding back an induced current to the operational amplifier unit; the error amplifier unit is used for receiving input from the operational amplifier unit, and generating a control voltage based on the input of the operational amplifier unit; and the output unit is connected with the error amplifier unit, and is used for receiving the control voltage and stabilizing an output voltage. The application has simple circuit structure, ingenious idea, can reasonably change the value of the output voltage according to the use requirement of the circuit, and has wide application range.

The application belongs to the technical field of combustion, and provides a heating furnace nitrogen sealing ignition method, which comprises the following steps: confirming the ignition section based on an ignition instruction, confirming the closed state of the coal gas section valve and the burner valve of the gas inlet section, if the valve state confirmation result comprises that the coal gas section valve and the burner valve are both closed, closing the nitrogen gas blowing of the ignition section, opening the coal gas section valve of the ignition section to a first opening degree, keeping the nitrogen gas blowing of other gas inlet sections except the ignition section, then opening the burner valve, igniting the burner port corresponding to the ignition section, and if the ignition is successful, closing the nitrogen gas blowing of other gas inlet sections. By combining the nitrogen gas blowing and the ignition process, the degree of automation of ignition can be effectively improved, the ignition quality can be effectively improved, the risk of deflagration can be reduced, and the labor cost can be reduced. The method has the characteristics of ingenious idea, high degree of automation, wide adaptation range, and good risk control effect.