Dual in-line package frame

The invention relates to a dual in-line package frame. The dual in-line package frame comprises a base island piece, a chip and an internal pin, wherein the base island piece is in a flat plate shape, the internal pin is connected to the base island piece, and the chip is arranged on the base island piece. An included angle exists between the internal pin and the flat plate face of the base island piece. The internal pin and the base island piece are integrally formed, and the aim of improving the heat dissipation effect is achieved.

Sealing assembly and crystal growth equipment

The invention discloses a sealing assembly and crystal growth equipment, the sealing assembly comprises a first sealing element and a second sealing element, the first sealing element is suitable for being connected to the peripheral wall of an opening in a sealing manner, the first sealing element defines an insertion cavity and a communication cavity, the top of the communication cavity is open, and the bottom of the communication cavity communicates with the opening; the second sealing piece comprises an insertion matching part and a mounting part which are connected with each other, the insertion matching part is annular and is inserted into the insertion matching cavity, the lower end of the insertion matching part is suitable for extending into the sealing liquid, and the mounting part is used for mounting the sealing liquid in the insertion matching part. The mounting part is arranged on the upper side of the insertion matching cavity and used for sealing the insertion matching part ...

Ship photovoltaic inverter voltage vector orientation current servo control method

The invention relates to a ship photovoltaic inverter voltage vector orientation current servo control method, which is applied to dual-power supply of ship solar energy and a power generator. The inverter and the power generator operate in parallel, electric energy is provided for the ship, power generator output current is particularly preset to a value corresponding to the maximum frequency point in the case of rated output voltage, output voltage has the same phase, load current minus the preset current of the power generator serves as reference of inverter output current, stability of the output current and quick dynamic response are realized through current closed-loop control, and thus the actual output current of the power generator is the current preset value. The method is realized through a phase-locked loop, a current error controller and in a voltage vector orientation and coordinate system transformation method. The inverter has the advantages of a bidirectional power flow ...

Output impedance obtaining method and device based on asynchronous generator and rectifier system and readable storage medium

The invention relates to the technical field of ship DC micro-grids, and provides an asynchronous generator and rectifier system-based output impedance acquisition method, which comprises the following steps of: establishing an asynchronous generator mathematical model; establishing an average switching continuity model of the rectifier and the filter; establishing a small signal model of the asynchronous generator and the rectifier; establishing a closed-loop control loop small signal model based on a mode of adopting a vector to control an asynchronous generator; and obtaining a rectifier DC side output impedance expression based on the closed-loop control loop small signal model. Therefore, the output impedance of the asynchronous generator and the rectifier can be accurately obtained, impedance stability analysis can be conveniently carried out on the ship direct-current micro-grid adopting the asynchronous generator, and the stability of the ship direct-current micro-grid is improved ...

Converter-based DC micro-grid system stability analysis method

The invention relates to the technical field of direct-current micro-grid systems, in particular to a direct-current micro-grid system stability analysis method based on a converter. The method specifically comprises the following steps: acquiring a reference voltage Vref, a load current iload and a direct-current power grid side voltage Vdc corresponding to each converter in a direct-current micro-grid system; establishing an ARX model, inputting the reference voltage Vref and the load current iload as input data and the direct current power grid side voltage Vdc as output data into the ARX model, and performing system identification to obtain a transfer function of each converter; and calculating the transfer function of the DC micro-grid system according to the transfer function of each converter, and analyzing the stability of the system through pole distribution. According to the method, under the condition that commercial converters widely exist in the industrial field, the stability ...

Cascading waste refrigerator crushing equipment

Cascading waste refrigerator crushing equipment comprises primary crushing equipment and secondary crushing equipment, wherein the primary crushing equipment and the secondary crushing equipment are overlapped up and down; a bracket platform is arranged on the periphery of the primary crushing equipment; a discharge port of the primary crushing equipment and a feed port of the secondary crushing equipment are in butt joint up and down; a material crushed by the primary crushing equipment directly falls into the secondary crushing equipment and is further crushed. The primary crushing equipment and the secondary crushing equipment are designed into a cascading way, and conveying equipment generally connected between the primary crushing equipment and the secondary crushing equipment is eliminated, so that the floor areas of the primary crushing equipment and the secondary crushing equipment in the prior art are greatly reduced, the stroke of a production line is shortened and the production ...

Soldering equipment and soldering method

The invention provides soldering equipment and a soldering method. The soldering equipment comprises a hot melt tin pot in the top end of which an opening is formed, a soldering flux container in the top end of which an opening is formed, and a mechanical arm which comprises a driving device and a clamping part used for clamping a component to be soldered, wherein the driving device drives the clamping part to move between the hot melt tin pot and the soldering flux container and drives the clamping part to move in the longitudinal direction. The soldering equipment, provided by the invention, can perform soldering treatment on leading wire feet of the component; replaces the tin plating treatment in the prior art; the soldered component is clamped by the clamping part; the driving device drives the clamping part to move; the leading wire feet of the component are firstly in contact with soldering flux through the opening in the upper part of the soldering flux container, moved to the position ...

Microgrid short-circuit fault protection method and device based on current change rate difference value

The invention relates to the technical field of tug direct-current power grid relay protection, and provides a micro-grid short-circuit fault protection method based on a current change rate difference value, and the method comprises the steps: continuously collecting current data; setting two sliding windows to record current historical information; fitting current data of the first sliding window according to a fitting formula; the current change rate of the first sliding window is calculated through a fitting formula; obtaining the actuating quantity of longitudinal differential protection according to the current change rate; calculating the sum of the maximum value of the differential current and the mean value of the absolute values of the currents at the two ends of the cable according to the current data of the second sliding window; the braking amount of longitudinal differential protection is obtained according to the sum of the maximum value of the differential current and the ...

Top cover assembly, crystal growth equipment and crystal growth method

The invention discloses a top cover assembly, crystal growth equipment and a crystal growth method.The crystal growth equipment is provided with a containing cavity, the top cover assembly covers the top of the containing cavity and comprises a top cover, a stirring structure and a seed crystal mounting structure, the top cover is provided with a plurality of mounting parts arranged at intervals, and the mounting parts comprise the first mounting part and the second mounting part; the stirring structure is mounted on the first mounting part and is used for stirring the solution in the containing cavity, and the seed crystal mounting structure is mounted on the second mounting part and is used for mounting a seed crystal. According to the top cover assembly disclosed by the invention, the adhesion growth stability of the seed crystal can be improved, the limitation of seed crystal feeding amount due to seed crystal movement is broken through, and the production efficiency is ensured.

Amorphous alloy flow sensor

Electric cooker temperature sensor with ceramic base

The utility model discloses an electric cooker temperature sensor with a ceramic base, which relates to the technical field of temperature sensors, and comprises a temperature sensor main body, the ceramic base and a fixed wire harness ring, the temperature sensor main body comprises a lead and the ceramic base, the bottom of the temperature sensor main body is fixedly connected with the ceramic base, and the ceramic base is fixedly connected with the lead. The wire harness fixing device has the advantages that the wire harness fixing ring, the through hole, the fixing bolt, the first magnetic sheet and the second magnetic sheet are arranged, the position of the fixing bolt is adjusted by arranging the number of the wires according to needs, and the wires are connected with the first connecting block and the second connecting block from the contact position of the first connecting block and the second connecting block. Due to the fact that the magnetic poles of the first magnetic sheet ...

Recycling system for waste electrical and electronic products

The invention discloses a recycling system for waste electrical and electronic products. The recycling system is characterized by comprising a control system as well as a crushing system, a separation system, a dust collection system, a waste gas collection system and a draught fan which are controlled by the control system, wherein the crushing system comprises a knocking crusher, the separation system comprises a winnower and a plastic and metal separation device, and the knocking crusher, the winnower and the plastic and metal separation device are connected through conveyer devices sequentially to form a plastic and metal separation production line; the knocking crusher and an air outlet of the winnower are connected with the dust collection system respectively for collecting light materials and dust of the whole recycling system; an air outlet of the dust collecting system is connected with the waste gas collection system; and the draught fan is connected with the waste gas collection ...

Multi-energy resource ship micro-grid real-time energy optimal scheduling method

The invention aims to provide a multi-energy resource ship micro-grid real-time energy optimal scheduling method, which comprises the steps of S1, constructing an output power prediction model of a support vector machine ship solar power generation unit based on simulated annealing; S2, acquiring energy storage state of charge (SOC) in real time on the basis of predicting the photovoltaic real-time output power when a load is stable, dividing an operating mode of the system into a plurality of modes under two indexes MinSOCbat and MaxSCObat of energy storage, then establishing a system model and stable operation boundary conditions of each power generation unit, establishing a multi-objective function and a constraint condition function which take the system operation stability and maximum energy saving as an optimization objective, and realizing optimal distribution of the output power of different power generation units at the various different operating modes by adopting a genetic algorithm ...

Intelligent bearing device of ship propulsion shafting based on CPS

The invention discloses a CPS-based ship propulsion shafting intelligent bearing device, and relates to the technical field of ship propulsion shafting, the CPS-based ship propulsion shafting intelligent bearing device comprises a blade, one end of the blade is connected with a propulsion shafting intelligent bearing device, and the propulsion shafting intelligent bearing device is in interactive control connection through an intelligent bearing system control module; the intelligent bearing device of the propulsion shafting comprises a radial intelligent bearing and an axial intelligent bearing, wherein the axial intelligent bearing comprises a magnetic suspension shaft, a rotor, an intelligent stator, a stator winding and an air gap sensor. According to the CPS-based intelligent bearing device for the ship propulsion shafting, the intelligent bearing system collects physical information of an air gap between the stator and the rotor, meanwhile, ship operation environment information is ...