37results about How to "Reduce experiment preparation time" patented technology

The invention provides a wearable multi-channel surface electromyogram signal collecting armlet which comprises a signal conditioning module, a signal processing module, a power module and an armlet module. The signal conditioning module is connected with the signal processing module through a flexible circuit board line, namely an FPC line. The signal conditioning module, the signal processing module and the power module are arranged on the armlet module in an integrated mode. The signal conditioning module is used for collecting and processing surface electromyogram signals and transmitting the processed signals to the signal processing module. The signal processing module is used for processing the signals transmitted from the signal conditioning module and transmitting the signals to the signal receiving end. The power module supplies power to the signal conditioning module and the signal processing module. The wearable multi-channel surface electromyogram signal collecting armlet has the advantages of being convenient to wear and miniaturized, and users can walk freely in a communication range and conduct action with a large movement range.

The invention discloses a quick boxing device for pipette tips used in laboratories, which is characterized in that it comprises a tip positioning device, the outer side of the positioning device is connected with the bottom bracket of the baffle, and the bottom bracket of the baffle is provided with a baffle The gun head positioning device is composed of multiple groups of metal sheets, each group of metal sheets is composed of two rotatable metal sheets, the two metal sheets are connected by a central shaft, and the end of the central shaft is connected with the bottom bracket of the baffle , each metal sheet is distributed with a plurality of grooves, the grooves of any two adjacent and different groups of metal sheets form a gun head hole corresponding to the gun head; the bottom bracket of the baffle is provided with control two adjacent and Different sets of sheet metal open and close boxed levers. Through the quick boxing device for pipette tip of the present invention, the tip can be boxed at one time, easy to operate, and compact in structure, thereby saving experiment preparation time, saving scientific research funds, and improving experiment efficiency.

The invention discloses a locking mechanism for an automobile wind tunnel balance strut. The locking mechanism comprises a fixing sleeve which is provided with a base fixedly connected with the fixingsleeve; a piston which is arranged inside the fixing sleeve and provided with a locking sleeve fixedly connected with the piston, wherein the locking sleeve is internally provided with a guide groove; a spring which is arranged between the piston and the base; a compressed gas passage which is arranged on the fixing sleeve, wherein the piston can move relative to the fixing sleeve under the pushof the compressed gas; and a spherical calliper which is provided with a fixing pin fixedly connected spherical calliper, wherein the spherical calliper swings around the swing shaft fixed on the base, and the fixing pin is guided in the guide groove. When the compressed gas is loaded through the compressed gas passage, the piston drives the fixing pin through the guide groove of the locking sleeve, and the spherical caliper swings around the swing shaft to enter the unlocked state. When the compressed gas is unloaded through the compressed gas passage, the piston drives the fixing pin throughthe guide groove of the locking sleeve, and the spherical caliper swings around the swing shaft to enter the locked state.

The invention relates to a fan cascade tester and a method for changing the inlet angle of the fan cascade, which are mainly used in the technical field of turbine aerodynamic testing. The tester at least includes a fan-shaped cascade and a test section, the fan-shaped cascade includes a fan-shaped disk and blades installed on the fan-shaped disk; the test section is a continuous, smooth and wrinkle-free flow channel on the inner surface. In the experimental section, at least the upper curved plate or the lower curved plate contains building block units, and the building block units are spliced ​​with each other. The method can conveniently change the airflow inlet angle of the fan cascade and can guarantee the airflow quality. The flow channels spliced ​​by the building block units in the present invention can provide different intake angles for the downstream fan cascades. And it can be adjusted flexibly with a very small indexing angle, which reduces the material and process costs for manufacturing multiple transition sections, shortens the test preparation time, and expands the use of fan-shaped cascades.

The invention relates to the technical field of experimental equipment, and discloses a test tube placement rack for chemical experiments, which includes a base in which a storage battery is fixedly installed by bolts, and at least two independently working button switches electrically connected to the storage battery are fixedly installed on the base , the upper part of the base is fixed with a lower matching seat through bolts, and the upper part of the lower matching seat is installed with an upper matching seat through a bearing. The test tube placement rack designed by the present invention can effectively place, clean and dry the test tubes according to the use needs of the test tubes, thereby effectively facilitating the maintenance of the test tubes, reducing the physical consumption of the experimental operators, and can It is convenient for experiment operators to mark and select test tubes, saves experiment preparation time, improves experiment efficiency, and has high practical value.

The invention discloses a gravity acceleration measurement instrument based on a free falling body method, which comprises an experiment pipe column, a first permanent magnet, a second permanent magnet, a first magnetic sensor, a second magnetic sensor and a processing module, wherein the experiment pipe column is vertically placed; the first permanent magnet and the second permanent magnet are arranged at different heights of the experiment pipe column and separated by a preset distance; the first magnetic sensor is arranged between the first permanent magnet and the pipe wall of the experiment pipe column; the second magnetic sensor is arranged between the second permanent magnet and the pipe wall of the experiment pipe column; the first magnetic sensor and the second magnetic sensor generate sensing signals when a metal detected object respectively falls to the corresponding heights; the processing module is respectively connected with the first magnetic sensor and the second magnetic sensor and is used for carrying out processing on the sensing signals generated by the first magnetic sensor and the second magnetic sensor, respectively obtaining corresponding falling edge trigger pulse signals and acquiring falling time of the metal detected object within the preset distance according to the falling edge trigger pulse signals corresponding to the first magnetic sensor and the second magnetic sensor so as to calculate a gravity acceleration according to the preset distance and the falling time.

The invention discloses a general wind power converter experimental platform based on a double-fed wind driven generator. The experimental platform comprises an electric motor, a gear mechanism and a double-fed asynchronous wind driven generator, wherein the electric motor is in transmission connection with the gear mechanism, and the gear mechanism is in transmission connection with the double-fed asynchronous wind driven generator. During test experiments of different types of wind power converters, the connection mode of a rotor winding of the double-fed asynchronous wind driven generator is correspondingly changed according to different types of wind power converters, thus, three different wind power converter experiments are carried out only by the general wind power converter experimental platform, and the building cost of the test platform is greatly reduced; and during the test experiments of different types of wind power converters, the corresponding wind power generator is not needed to replace, the experiment preparation time is shortened, and the running efficiency of the wind power converter experimental platform is greatly improved.

The invention relates to an automatic calibration method for X-ray grating phase-contrast imaging, comprising: moving a sample stage so that the sample stage is not on the optical path; X-rays emitted by an X-ray source form a fringe image on a detector; analyzing and obtaining the parameters of the fringe image ; Judging whether the parameters of the fringe image match the parameters of the first standard image; if the match is successful, the sample stage is moved back to the optical path, and the sample is placed on the sample stage; forming a shadow image; analyzing the parameters of the shadow image; judging whether the parameters of the shadow image match the parameters of the second standard image; if the matching is successful, then completing the automatic calibration. The invention also relates to an automatic calibration system for X-ray grating phase contrast imaging. The invention can complete the automatic calibration of the grating phase contrast, reduce the workload of manual adjustment, improve the experimental efficiency and reduce the error of human eyes.

The invention discloses a method for using a center calibration device of an engine vibration experiment and belongs to the field of testing tools for automobile components. In the time of use, firstly an engine is installed on a test bench according to requirements, through adjusting four support feet in front of and behind the engine, a height gauge is used to adjust the center height of the engine to be consistent with a center height of a dynamometer, a positioning plate of the device is fixed to the dynamometer, the position of a sliding sleeve in a pointer sliding rod is adjusted according to the model of the engine, fastening screws re tightened, a screw rod is rotated to adjust a protruding length, thus a tip head of a detection pin faces an outer surface of the engine flywheel, and the flatness of the engine and the dynamometer is adjusted through rotating a center shaft of the dynamometer. The device has the advantages of ingenious production, low production cost, strong interchangeability of components, labor saving, the effective reduction of the experimental cost of the engine and the shortening an experiment preparation time.

The invention provides an opening and closing dual-purpose low-speed return flow tunnel. An experimental section is divided into a bottom plate and an upper cover; the bottom plate is fixedly arrangedon the ground, and the upper cover and the bottom plate are in buckling fit to form the experimental section; the upper cover can move on the bottom plate through a sliding rail, and the experimentalsection and a contraction section are in inserting fit through an inserting ring and a butting ring; a pressure balance gap is reserved between the experimental section and a diffusion section; the top, adjacent to the inserting ring, of the upper cover and the top, adjacent to the butting joint, of the contraction section are each provided with an electromagnet mechanism, and the two electromagnet mechanisms are arranged in a directly-facing mode, are matched with each other, and can output homopolar repulsion or heteropole attraction electromagnetic force; four gas collecting plates are arranged on the periphery of a hole in the gas inlet end of the diffusion section, the gas collecting plates located at the top, the front end and the rear end of the hole are connected with the hole inthe gas inlet end of the diffusion section through hinges, the gas collecting plate located at the bottom end of the hole is fixedly connected, and the four gas collecting plates form a complete gas collecting hood when being in a spliced mode; and a portal crane is erected above the experimental section, a lifting ring is mounted at the top of the upper cover of the experimental section, and theupper cover is hoisted and transferred through the portal crane.

The present invention relates to a circular hero of an Alexandria fountain demonstration instrument, and to the field of the teaching instrument device technology. The instrument comprises a dual-column support, a water tank is arranged between the columns of the dual-column support, a fountain is arranged at the upper portion of the water tank, and two water supply pipelines are fixedly arranged at the lower portion of the fountain; the water tank includes a first air duct pipeline, a second air duct pipeline, a first water storage cavity and a second water storage cavity, hollow first rotating shaft and second rotating shaft are arranged at two sides of the water tank, and the first and second rotating shafts are concentrically arranged and allow the water tank to rotatingly connect with the columns; the first water storage cavity is provided with a first water duct port, the second water storage cavity is provided with a second water duct port, one ends of the first rotating shaft and the second rotating shaft are respectively connected with the first water duct port and the second duct port, and the other ends of the first rotating shaft and the second rotating shaft are connected with the nozzle pool through the water supply pipeline; and the first air duct pipeline is connected with the first water storage cavity and the second water storage cavity, the second air duct pipeline is connected with the first water storage cavity and the second water storage cavity, and the first air duct pipeline and the second air duct pipeline are both provided with control valves.

The invention discloses a freely-falling-body gravity acceleration measurement device based on capacitive sensors. The device includes: an experiment tube column, which is vertically placed to enablea metal detection object to carry out freely-falling movement from a top to a bottom in the experiment tube column; a first capacitive sensor and a second capacitive sensor, which are disposed at different heights of the experiment tube column, are separated with a preset distance, and are used for generating induction signals when the metal detection object respectively falls to the correspondingheights; and a processing module, which is respectively connected with the first capacitive sensor and the second capacitive sensor, and is used for processing the induction signals generated by thefirst capacitive sensor and the second capacitive sensor, respectively obtaining corresponding falling-edge triggering pulse signals, and obtaining a falling time of the metal detection object in thepreset distance according to the falling-edge triggering pulse signals, which correspond to the first capacitive sensor and the second capacitive sensor, to facilitate a process of calculating gravityacceleration according to the preset distance and the falling time.

The invention discloses an intelligent testing device for a high-temperature superconducting terahertz radiation source based on different bias conditions, which includes a test bench. A sealed shell is fixedly installed on the left side of the upper surface of the platform, and the low-temperature refrigeration system includes a Stirling refrigerator. A cooling chamber is installed at the output end of the Stirling refrigerator, and a liquid nitrogen cooling tank is installed on the right side of the cooling chamber. An intelligent testing device for a high-temperature superconducting terahertz radiation source based on different bias conditions according to the present invention is used in conjunction with an improved Stirling refrigerator and a liquid nitrogen cooling tank, and the radiation source is installed on the ground through a copper support Inside the cooling chamber of the Stirling refrigerator, the computer controls the liquid nitrogen flow switch of the liquid nitrogen cooling tank through the temperature controller made by the laboratory to control the flow of liquid nitrogen and the cooling efficiency of the Stirling refrigerator, and accurately control the cooling chamber internal temperature.

The invention relates to a visualization engine, in particular to a tracer injection system for a visualization engine. It mainly includes the cylinder head, which is characterized in that: a hole is opened in the center of the cylinder head, and a fuel injector is arranged in the hole, which can directly inject fuel into the cylinder; a hole is opened on the side of the air inlet of the cylinder head, and a There is a tracer injection valve such that the tracer injection valve communicates with the intake passage of the cylinder head. The system uses an independent tracer and fuel injection system, which can effectively control the amount of tracer, save costs, improve economy, and reduce unnecessary secondary reaction problems caused by excessive metering; at the same time, effectively eliminate When the concentration of the fluorescent substance is too high, the phenomenon of self-quenching will occur.