Abstract: A device and a method for nondestructively detecting a transient characteristic of a conductive screw of a turbo-generator rotor are provided. The device includes a personal computer (PC), an extremely-steep pulse generator, an ultra-high-frequency double-isolation transformer, and a pulse emitting and coupling module, which are connected in sequence. The pulse emitting and coupling module is connected to a load. A synchronous pulse receiving non-inductive divider circuit synchronously receives a characteristic waveform from the load, and the synchronous pulse receiving non-inductive divider circuit is connected to an ultra-high-speed analog/digital (A/D) module through a nonlinear saturation amplifying circuit that amplifies a signal. The PC receives a signal from the ultra-high-speed A/D module. The load includes a positive or negative excitation lead loop that is in a 180° symmetrical and instantaneous short-circuit state and a rotor shaft.

Abstract: A method for constructing an efficient product surface defect detection model based on network collaborative pruning is provided. According to an initial product surface defect detection model, the method provides a network-based collaborative pruning method and constructs the efficient product surface defect detection model. On a premise of ensuring an accuracy of a product defect detection method, a product surface defect detection time is reduced to satisfy manufacturer's requirements on the product surface defect detection time and accuracy of product surface defects.

Abstract: An electrode assembly and a lithium ion electric roll having the same are provided. The electrode assembly includes: a first electrode unit; a first anti-puncture cushion; in which the first electrode unit includes a first electrode sheet, an second electrode sheet, and a separator, the second electrode sheet comprises a second top edge and a second bottom edge along the length direction of the first electrode unit; an edge of the first anti-puncture cushion exceeds the second electrode sheet from the second top edge or the second bottom edge along the length direction of the first electrode unit.

Abstract: A device for detecting a slot wedge, an air gap and a broken rotor bar is provided, where a sequential circuit generates double concurrent pulses; the sequential circuit is connected to driving power modules; the driving power modules are connected to front-end interface circuits; the front-end interface circuits convert the double concurrent pulses into corresponding magnetic-field pulses; the magnetic-field pulses are transmitted to power supply terminals on adjacent phases of stator windings through impedance matching pins and coupled at a corresponding coil, air gap and squirrel cage rotor to generate single groups of cyclic rotating magnetic potentials; single rotating magnetic potentials are sequentially generated in adjacent slots on each of the phases of the stator windings; rotating electric potentials in magnetic circuits with two symmetrical phases are magnetically coupled to form distributed coupling magnetic field reflected full-cycle waves for reflecting a difference of a corresponding slot wedg

Abstract: A catalyst for continuous production of 1,1,1,3-tetrachloropropane through gas-solid reaction as well as a preparation method and use thereof are provided. The catalyst includes a zero-valent iron and phosphorus co-modified carbon material which includes a carbon material as a carrier, a zero-valent iron supported onto the carrier and serving as an active component, and a phosphate functional group formed on the surface of the carbon material. The preparation method includes: co-modifying a carbon material using a ferric salt and organic phosphorus to obtain the catalyst for continuous production of 1,1,1,3-tetrachloropropane through gas-solid reaction. The present application further provides a method for continuous production of 1,1,1,3-tetrachloropropane through gas-solid reaction.

Abstract: Embodiments of the present disclosure provide a positioning method and apparatus, a device, and a storage medium, the method is applied to a wearable display device, where the wearable display device includes a display host and a peripheral, the display host and/or the peripheral are used for projecting a structure light image onto an object in a real environment, and the method includes: acquiring an image obtained by the display host shooting the object, and an image obtained by the peripheral shooting the object; and determining, according to image obtained by shooting and the structure light image, a pose of the peripheral relative to the display host.

Abstract: A crusher includes a blade assembly and a drive assembly. The blade assembly includes a first blade and a second blade. The drive assembly is respectively connected with the first blade and the second blade, and is configured to drive the first blade and the second blade to rotate. The first blade is configured to disperse and perform primary cutting of the materials. The second blade is configured to perform secondary cutting of the materials. The first blade makes the materials fully disperse, so that the second blade can fully cut the materials. In addition, the first blade initially cuts the materials, so that the formed fragments can achieve a better fertilization effect.

Abstract: An air compressor includes a controller, a pump and an air storage tank. The pump is in communication with the air storage tank. A first air inlet and a first air outlet are provided on the pump. The pump is configured to pump an external air into the air storage tank. The controller is provided at the first air inlet of the pump, and is electrically connected with the pump. The controller is configured to control the operation of the pump. The external air is in contact with the controller, and enters the pump through the first air inlet and then flows out of the pump through the first air outlet, so as to realize a heat dissipation of the pump and the controller.

Abstract: A crusher includes a blade assembly and a drive assembly. The blade assembly includes a first blade and a second blade. The drive assembly is respectively connected with the first blade and the second blade, and is configured to drive the first blade and the second blade to rotate. The first blade is configured to disperse and perform primary cutting of the materials. The second blade is configured to perform secondary cutting of the materials. The first blade makes the materials fully disperse, so that the second blade can fully cut the materials. In addition, the first blade initially cuts the materials, so that the formed fragments can achieve a better fertilization effect.

Abstract: A method for constructing an efficient product surface defect detection model based on network collaborative pruning is provided. According to an initial product surface defect detection model, the method provides a network-based collaborative pruning method and constructs the efficient product surface defect detection model. On a premise of ensuring an accuracy of a product defect detection method, a product surface defect detection time is reduced to satisfy manufacturer's requirements on the product surface defect detection time and accuracy of product surface defects.

Abstract: A versatile electric cart, including a frame, a handle, a battery, a motor, a wheel and an axle. The frame is provided with components connecting with attachments. The components include a snib, a bolt, a connecting hole and a T-shaped column. The snib is provided at the rear end of the frame. The front and rear beam of the frame are both provided with the screw hole. The front end of the frame is provided with the connecting hole and the T-shaped column. The T-shaped column is provided at the axle, the top and bottom of the T-shaped column are both provided with the screw hole. The front end of the T-shaped column is provided with the connecting hole. The frame is provided with the battery. The attachments are fitted to the frame by the snib, the screw hole, the connecting hole or the T-shaped column.

Abstract: The present invention discloses a brake handle device and an electric tractor. The brake handle device includes a seat body, a microswitch, a wrench and an elastic piece, wherein the microswitch is electrically connected with a driving motor and a power supply, and includes a main body part and a braking part; the main body part is arranged on the seat body; the braking part extends into the main body part and can elastically expand and contract relative to the main body part; the wrench is rotatably arranged on the seat body and can be abutted against the braking part; and the elastic piece is arranged on the seat body and connected with the wrench. The wrench is held to drive the wrench to rotate in the direction close to a handlebar; and the wrench is released to make the wrench rotate and reset.

Abstract: A versatile electric cart, including a frame, a handle, a battery, a motor, a wheel and an axle. The frame is provided with components connecting with attachments. The components include a snib, a bolt, a connecting hole and a T-shaped column. The snib is provided at the rear end of the frame. The front and rear beam of the frame are both provided with the screw hole. The front end of the frame is provided with the connecting hole and the T-shaped column. The T-shaped column is provided at the axle, the top and bottom of the T-shaped column are both provided with the screw hole. The front end of the T-shaped column is provided with the connecting hole. The frame is provided with the battery. The attachments are fitted to the frame by the snib, the screw hole, the connecting hole or the T-shaped column.

Abstract: Disclosed is a method of synthesizing 1,2,4-triazole-3-thione compounds and intermediates thereof. The method includes reacting a hydrazine with glyoxylic acid to form a hydrazono acetic acid intermediate followed by reacting the latter with thiocyanate to obtain the 1,2,4-triazole-3-thione compound. The raw materials involved in the present method are readily available, and the reaction is very specific in terms of regioselectivity, resulting in minimum by-product and high product yield. There are neither specific requirements for special equipment nor special operations such as high vacuum, high temperature, anhydrous and oxygen-free manipulations. The process is simple and generates minimum wastes, suitable for industrial production.

Abstract: Disclosed is a lightweight electric earth drill including a mounting plate, a drill stem and an outer shell, a motor installed on the mounting plate and configured to drive the drill stem to rotate, a rechargeable battery configured to power the motor, and a controller configured to control the motor and electrically connected to the motor and the rechargeable battery. The lightweight electric earth drill is driven by the motor and has low noise, which causes less damage to health of the workers and does not disturb the residents around the construction site. The lightweight electric earth drill is powered by rechargeable battery or mains electricity without exhaust emission. The motor is controlled by the controller and rotates forwardly and reversely, enabling the drill bit to be pulled out after drilling the earth.

Abstract: An electric winch includes a winch body; a drive motor configured to drive the winch body, the drive motor being a brushless motor; a lithium battery configured to power the drive motor; and a motor controller electrically connected between the lithium battery and the drive motor and configured to control the drive motor. The winch body includes a winch support on which the drive motor is fixedly mounted; a gearbox connected to the drive motor and configured to receive a driving force of the drive motor; and a winch drum connected to the gearbox and driven by the gearbox to rotate. The electric winch of the present invention has the advantages of small volume, long service life, low noise and convenience for carrying.

Abstract: An electric winch includes a winch body; a drive motor configured to drive the winch body, the drive motor being a brushless motor; a lithium battery configured to power the drive motor; and a motor controller electrically connected between the lithium battery and the drive motor and configured to control the drive motor. The winch body includes a winch support on which the drive motor is fixedly mounted; a gearbox connected to the drive motor and configured to receive a driving force of the drive motor; and a winch drum connected to the gearbox and driven by the gearbox to rotate. The electric winch of the present invention has the advantages of small volume, long service life, low noise and convenience for carrying.