6results about How to "Low stability requirements" patented technology

The application discloses a method for establishing end-to-end secure communication of unmanned aerial vehicle under cloud network architecture, and takes cloud server as a security service center to provide full-process authentication service for unmanned aerial vehicle end system; the cloud server only issues public authentication materials to unmanned aerial vehicles, and session key negotiation and establishment of end-to-end secure communication are realized between unmanned aerial vehicles; the unmanned aerial vehicle end system does not need to store authentication materials of other unmanned aerial vehicles in advance, the cloud server is driven by specific tasks, and specific authentication materials required for key negotiation are issued to unmanned aerial vehicles which need to be securely cooperated according to task requirements. The application only requires that the cloud server and any one of the unmanned aerial vehicles for key negotiation establish a communication connection, and the authentication materials issued by the cloud server can make the unmanned aerial vehicles realize key negotiation and establish an end-to-end secure channel in a specific range; different temporary public keys are used for each request message, which can effectively prevent the harm caused by long-term and short-term secret leakage.

A pressure measuring device for a coal mine stope face belongs to the technical field of coal mining and comprises a chassis, a guide frame is fixedly arranged on the chassis, a concentric-square-shaped frame capable of vertically moving is mounted on the guide frame, and a first through groove and a second through groove are formed in one end, slidably connected with the guide frame, of the concentric-square-shaped frame and are arranged up and down. A stress detector is movably arranged in the first through groove, a drill rod is movably arranged in the second through groove, the stress detector and the drill rod are transversely arranged, the stress detector is connected with a first electric telescopic unit, and the drill rod is connected with a first motor and a second electric telescopic unit. The first electric telescopic unit and the second electric telescopic unit are both transversely and fixedly installed in the concentric-square-shaped frame, the stress detector and the drill rod which are transversely arranged are adopted, stress detection can be directly conducted on the coal wall of a working face or the side of a roadway, and effective data are provided for supporting adjustment; and transverse drilling does not need to penetrate through multiple rock stratums, the drilling depth is small, and the geological condition limitation is reduced.

The application relates to an injection tube assembly, a high-pressure injection device, a high-pressure injection system and a control method thereof. The syringe of the injection tube assembly is installed on an injection installation position of the high-pressure injection device, the liquid injection tube group is installed on a liquid injection installation position, the liquid discharge tube group is installed on a liquid discharge installation position, and the exhaust bag is installed in the installation groove. The boost driving mechanism drives the piston to move backward in the injection cylinder, and the liquid medicine is sucked into the injection cylinder through the first pipeline of the liquid injection tube group. The boost driving mechanism drives the piston to move forward in the injection cylinder, and the liquid medicine in the injection cylinder is pushed into the exhaust bag through the second pipeline. After the liquid medicine enters the exhaust bag, the liquid medicine sinks due to gravity and boost pressure and is discharged through the liquid discharge tube, and the bubbles float to the space above the liquid medicine. Even during the liquid medicine injection process, the bubbles can be prevented from being pushed into the human body in the exhaust bag, the continuity of the injection process is guaranteed, the requirement for the structure air tightness and stability is reduced, and the reliability during use is ensured.

The utility model relates to the technical field of seedling transplanting, in particular to a seedling transplanter which comprises a rack, a seedling storage mechanism, a seedling clamping mechanism, a seedling conveying mechanism and a seedling planting mechanism, wherein the seedling storage mechanism, the seedling clamping mechanism and the seedling conveying mechanism are arranged at the upper end of the rack; the input end of the seedling feeding mechanism corresponds to the output end of the seedling clamping mechanism, and the output end of the seedling feeding mechanism corresponds to the input end of the seedling planting mechanism; the seedling storage mechanism comprises a seedling storage box arranged at the upper end of the rack, a seedling pushing motor arranged on the outer wall of the seedling storage box, seedling pushing driving shafts rotationally arranged on the inner walls of the two sides of the seedling storage box, seedling pushing driving gears arranged on the seedling pushing driving shafts, and seedling pushing driven gears rotationally arranged on the inner wall of one side of the seedling storage box and corresponding to the seedling pushing driving gears; the seedling pushing chain is arranged on the seedling pushing driving gear and the seedling pushing driven gear, and the seedling pushing rod is arranged on the seedling pushing chain. According to the design, the structural complexity and the control difficulty of the seedling clamping mechanism are greatly reduced.

The utility model discloses a seat buckle which comprises a buckle body and at least two inserting blocks, and a fixing cavity is formed in the buckle body. The buckle further comprises an unlocking piece, a locking structure and a magnetic attraction assembly, the unlocking piece is positioned on the buckle body and movably arranged in the fixing cavity in a penetrating mode, and compared with the operation that in the prior art, the inserting block needs to be manually pushed into the fixing cavity and the inserting block can be released only by stably controlling the buckle, the magnetic attraction assembly is driven by magnetic force, and therefore the inserting block can be released. And the insertion block can be automatically and accurately adsorbed into the fixed cavity and is positioned, so that the positioning efficiency is greatly improved, and the insertion block can be effectively prevented from being accidentally brought out by a tightened safety belt. In the inserting block dismounting link, a user only needs to lightly hold the buckle body and press the unlocking piece, magnetic traction can be quickly relieved, and easy piece taking is achieved. The whole operation process has low requirements on the stability of the buckle main body, and the use convenience and reliability are greatly improved.

A kind of rockfill material rheological acceleration test method based on small amplitude cyclic stress disturbance belongs to geotechnical engineering technical field.It includes: preparing rockfill material sample and carrying out initial state adjustment;Loading to target confining pressure and target deviatoric stress state;On the basis of target deviatoric stress state, small amplitude axial cyclic stress is applied to promote rockfill material particle contact adjustment, skeleton structure rearrangement and cumulative deformation development;Axial deformation, volume deformation and plastic strain accumulation direction under cyclic loading condition are collected and arranged;Then, the development direction of the volume change-axial deformation obtained by the acceleration test is compared and verified by traditional pure static load rheological test.The invention introduces small amplitude cyclic stress as an acceleration disturbance means, which can quickly obtain the rheological deformation value of rockfill material under the premise that the development direction of volume change and axial change remains reasonable and consistent, shorten the duration of traditional rockfill material rheological test, reduce the long-term stable operation requirements of large test equipment, and improve the efficiency of obtaining rheological deformation value of rockfill material under multiple working conditions.