32results about How to "No destructive damage" patented technology

The invention discloses a composite board. The composite board comprises a first board, a second board and a plurality of beams connected with the first board and the second board; the first board andthe second board are boards with corresponding characteristics respectively, and each comprise a base board, a stretching resistance layer and a compression resistance layer; the first board and thesecond board are oppositely arranged, the outer surface of the first board and the outer surface of the second board are parallelly arranged at the preset distance, and the stretching resistance layerof the first board and the stretching resistance layer of the second board are the same in preset stretching prestress. The composite board provided by the invention can be used for wall surface panel or decorative panel for a building module, and boards for other purposes.

The invention discloses a resistance lowering device and method for the power cable high-resistance fault point.The resistance lowering device comprises a high-voltage pulse generating part and a direct-current arc maintaining part, wherein the high-voltage pulse generating part and the direct-current arc maintaining part are in parallel.The high-voltage pulse generating part is connected with the direct-current arc maintaining part through a sphere gap, a magnetic switch and a silicon stack; when the resistance lowering device for the power cable high-resistance fault point operates, pulse voltage is firstly output, and a direct current for keeping arc burning is finally output.When the resistance lowering device for the power cable high-resistance fault point operates, a high-voltage pulse firstly acts on a high-resistance fault point of a cable, after the high-resistance fault point of the cable is broken down by the high-voltage pulse and arc discharging is carried out, resistance is decreased to be close to a short circuit, and the direct-current arc maintaining part provides the direct current for the high-resistance fault point to keep arc burning till the high-resistance fault point is subjected to resistance lowering.According to the resistance lowering device and method, under the condition that the power cable is not damaged, main insulation of the cable of the high-resistance fault point can be partly carbonized within ten more seconds to dozens of seconds, and resistance to ground of the fault point is subjected to resistance lowering.

The invention provides a full wheel steering unmanned platform driven by hub motors. The full wheel steering unmanned platform comprises a ground remote control station, an image acquisition module, a platform main body controller and tire steering mechanisms. The platform main body controller receives a motion control command sent by the ground remote control station, and according to the rotation mode and the rotation angle, the target rotation angle value and rotation direction of each tire are calculated and obtained; according to the difference between actual rotation angle values and a target rotation angle value and the rotation directions, a steering angle control signal of each tire is generated and sent to the corresponding tire steering mechanism; the tires are driven to deflect the corresponding rotating angles relative to the platform forward direction till the actual rotation angle values of the tires are equal to the target rotation angle value; the rolling torque and the rolling directions are sent to the corresponding tires, the hub motors inside the tires are driven to continuously rotate forwards or backwards according to the corresponding speed. The problems that a traditional unmanned vehicle is complex in mechanical structure, poor in maneuverability, narrow in application range and the like are solved.

The invention relates to a separating nut which comprises a shell, at least two split nuts, an annular connecting piece and a rotating ring. The annular connecting piece is arranged in the shell, andthe vertical direction of the rotating ring is limited by the annular connecting piece or the shell. The split nuts are limited by the annular connecting piece in the circumferential direction, and the displacement in the radial direction is controlled through rotation of the rotating ring. In the locked state, all the split nuts form a complete internal thread together, the rotating ring rotates,the split nuts are controlled to move outwards, and the separating nut enters an unlocked state. The locked state and the unlocked state of the separating nut are controlled through rotation of the rotating ring, and the process of unlocking and separating the nut does not have destructive damage to parts so that the separating nut can be repeatedly used, and the mechanical property of the separating nut can be detected before application. In addition, a shear frustum for bearing shear force is arranged on the upper portion of the shell, and the problem that a separating nut cannot bear shearforce is solved.