70results about How to "Precise closure" patented technology

A method of starting and apparatus for starting a multiphase electrical machine is disclosed. The aim is to reduce oscillatory pulsation in torque generated by the motor and inrush current that occurs shortly after start-up. The starting method comprises the steps of first connecting at least one, but less than all, of a plurality of windings to a respective phase-shifted supply voltage at a controlled point in the supply phase. Then, after a controlled delay following the first connection, connecting the or each remaining winding of the machine a respective phase-shifted supply voltage. The invention has particular application to multiphase (most usually, 3-phase) motors. However, it can also be applied to other electrical machines, such as generators and transformers. The method can be performed at initial start-up or, in the case of application to a motor, at Y-delta switchover.

A method and a device for producing a skin incision in surgical procedures and marking along the margins of the incision are disclosed.

The invention discloses an opening-closing type garbage can which comprises an outer can body, an inner can body and a can cover. An opening is formed in the top of the can cover, and one side of the opening is connected with the upper end face of a trough-shaped oblique plate. The lower end face of the trough-shaped oblique plate abuts against a movable baffle. The upper end of the movable baffle is connected with the inner surface of the top of the can cover through a hinge. The movable baffle and a horizontal plane form an angle beta of 60-80 degrees. The movable baffle and the trough-shaped oblique plate are matched in width and define a throwing opening. The opening-closing type garbage can has the advantages of being simple in structure, convenient to use, free of manual or foot treading operation, capable of achieving automatic garbage can cover opening and closing, and meanwhile capable of separating liquid in garbage and preventing rotting and reeking of garbage.

The invention relates to the field of underground coal seam and layer-penetrating sampling equipment in coal mines, and specifically discloses a closed-type sampling device at the bottom of a hole. It includes a sampling drill bit, a draft tube, a transmission shaft, a transmission gear, a valve, a collector, and a drill pipe connector; Disassemble the connection; the front part of the transmission shaft is provided with a stopper and placed in the guide tube, the middle part is sleeved with elastic parts, and the rear part is provided with transmission teeth to cooperate with the transmission gear; the transmission gear is operated with the valve The part is connected; the drill pipe connector is connected with the drill pipe. The sampling device of the invention can keep the obtained coal samples in their original state, thereby improving the accuracy of test results, and has a simple and reliable structure, small volume, and is convenient for repeated use.

The invention discloses a plate grid corrosion test method at high temperature and an apparatus therefor. In the invention, a more severe corrosion environment of a simulated battery under a working condition is provided, and a plate grid material is subjected to corrosion due to an electrolyte for longer time and at higher intensity, so that the plate grid material can be consumed quicker and theanti-corrosion performance of the plate grid material can be represented quickly, thereby greatly increasing test efficiency on corrosion of the plate grid without consumption of real battery products during the test. The test method only employs a less amount of plate grid material, so that test cost is greatly reduced; meanwhile, by means of a special plate grid corrosion test apparatus at hightemperature for carrying out the plate grid corrosion test at high temperature, temperature control of a colloid electrolyte and accurate sealing of a reaction tank cover are achieved, thereby bringing convenience to the test.

The invention provides a rocker plate type switch, belongs to the field of electric appliance switch, and solves the problem that the relative positions of a spring sleeve and a rocker plate in the conventional rocker plate type switch are easily changed. A through hole is formed in the upper cover plate of the rocker plate type switch; a key is mounted in the through hole; the upper cover plate is buckled on the base; the lower part of the key is column-shaped; a spring hole is formed in the center of the key; a spring and a sliding block are mounted inside the spring hole; the upper end of the spring is propped against the bottom of the spring hole; the lower end of the spring is fixedly connected with the upper end of the sliding block; the lower end of the sliding block is propped against the surface of the rocker plate; a first static contact is arranged below one end of the rocker plate; the sliding block is column-shaped; the spring hole is provided with a first side wall, a second side wall, a third side wall and a fourth side wall; the distance between the first side wall and the second side wall is greater than or equal to the diameter of the sliding block; the distance between the first side wall and the second side wall is smaller than the smallest distance between the third side wall and the fourth side wall. The rocker plate type switch is high in closure and opening sensitivity and is stable and durable.

The invention discloses an intelligent phase selection switch controller, and belongs to the technical field of power electronics. The intelligent phase selection switch controller comprises a microprocessor, a power supply circuit, a displaying circuit, a failure alarming circuit, a voltage zero point capturing signal collecting processing circuit, a current zero point capturing signal collection processing circuit, a voltage failure detection signal collection processing circuit, a current failure detection signal collection processing circuit, a magnetic latching relay driving circuit and a switch controller mode conversion circuit. The microprocessor receives input commands and signals input by the four signal collection circuits, carries out processing on the input signals, and controls the magnetic latching relay to achieve zero passage switching. The intelligent phase selection switch controller can achieve flashy-flow-free input of a capacitor and electric-arc-free disjunction of relay contactors, can detect and automatically compensate action time error of zero switching, and can carry out detection on the performance of the relay, so that a user an replace different magnetic latching relays according to actual needs.

The invention relates to an adaptive zero-crossing protection relay for light control, which includes a live wire sampling circuit, a relay feedback sampling circuit, a relay drive circuit and a micro-processing unit; the live wire sampling circuit samples the phase of the alternating current in real time, and The sampling result is sent to the micro processing unit; the relay feedback sampling circuit samples the contact state of the relay in real time to obtain accurate closing and disconnecting moments, and the sampling result is sent to the micro processing unit; the relay The drive circuit amplifies the control signal from the micro-processing unit to drive the main relay as a switching element to act; the micro-processing unit obtains the zero-crossing trigger time according to the set program according to the sampling information of the live wire sampling circuit and the relay feedback sampling circuit . Therefore, the triggering time can be adjusted according to the actual action performance of the relay used in the relay light control circuit, and the self-adaptive function is achieved.

The present invention relates to the technical field of electronic circuits, and discloses a switch control circuit and a switch control system, wherein the control circuit includes: a plurality of parallel signal processing units, the signal processing unit has a first controllable switch; the first controllable The first end of the switch is connected to the first voltage signal, the second end is connected to the first port of the controller, and the third end is connected to the second voltage signal; the first voltage signal and the second voltage signal control the first control the on and off of the switch, and convert the first voltage signal into a third voltage signal; the third voltage signal is connected to the first port of the controller; the controller is configured to , and send the switch control command to the terminal to be controlled. After converting the high strong electric signal into a low stable weak electric signal, the circuit combines the controller to realize multi-channel switch control, and only processes the voltage signal in the whole circuit, avoiding the processing of various types of signals and ensuring the multi-channel Reliability of switch control.

The invention discloses a lasso lifting integrated device suitable for a hoist crane, belonging to the technical field of construction engineering. The device controls the connection state of the L-shaped lasso and the wire rope connecting the lock through the rotation of the rotating shaft, and the lock automatically controls the locking state of the lock through the sensor, so as to realize the self-lasso operation of the object to be hoisted and assist the hoisting. The invention realizes the combination of lassoing and hoisting of objects in the process of hoisting and transporting objects, solves the problem that some high-altitude objects are not easy to lasso in the process of hoisting and transporting objects, liberates labor, ensures hoisting safety and improves hoisting efficiency.