9results about How to "Maintain stiffness" patented technology

The embodiment of the invention provides a wind generating set rack design method and system, and belongs to the technical field of wind power. The method comprises the following steps: S10) carrying out topological optimization on a topological region of a rack model, and checking the rack model after topological optimization; s20) identifying and constructing a transfer matrix of stress and load of each key part; s30) executing a genetic algorithm based on a load updating result and the transfer matrix to obtain optimized geometric parameters of each key part; s40) on the basis of the optimized set parameters of each key part, updating a topological region optimization result of the rack, and checking the rack model after updating topological optimization; and (S50) repeating the step (S20) to the step (S40) until the geometric parameters, meeting the design requirements, of all the key parts are obtained, and outputting a corresponding rack design plane.According to the scheme, the lightweight design effect of the rack is improved, and the safety and economical efficiency of the rack are guaranteed.

The invention relates to the technical field of autoclave forming dies, and discloses a bullet train protection plate autoclave forming die which comprises a chassis and a bottom plate which are integrated, the bottom face of the chassis is of a grid structure, the top of the chassis is connected with the bottom plate through a supporting structure so that the bottom plate can be communicated with the outside, and a protection plate material containing groove is formed in the top face of the bottom plate. A plurality of through holes are formed in the side face of the chassis so that the through holes in the side face can communicate with the grid structure. Uniform distribution of heat is facilitated, stress concentration is reduced, the heating performance and the heat dissipation performance are improved, and sufficient heat stability and heat conduction coefficient are achieved, so that the production cost is reduced; through combination of a grid structure and a protection plate mold containing groove, the self weight is reduced so as to reduce the production and transportation cost, meanwhile, the strength and rigidity are kept, material use is optimized, reinforcing ribs are combined on the edge of the mold, stability and durability are improved, and fatigue and deformation risks are reduced; the net rack design facilitates heat dissipation, heat stability is improved, forming precision is ensured, and product defects are reduced.

The invention relates to the technical field of structural damping devices, and particularly discloses a prestressed shape memory alloy damper which comprises a yield type assembly and two viscous type assemblies, and the two viscous type assemblies are fixedly connected to the two sides of the yield type assembly; the yield type assembly comprises an energy dissipation core plate, a plurality of prestressed inclined struts, a first supporting plate, a second supporting plate, an upper connecting plate, a lower connecting plate, a pre-tightening bolt, a first base plate, an angle plate, a restraining plate and a second base plate, and the prestressed inclined struts are fixedly connected to the front side and the rear side of the energy dissipation core plate correspondingly. According to the damper, the defect that the shape memory alloy material is high in yield strength and cannot rapidly enter energy consumption prior to a main body structure is overcome by adopting a pre-tightening force mechanism, meanwhile, the advantages of high ductility and high fatigue of the shape memory alloy material are exerted, and the damper has the anti-seismic and shock-absorbing effect of multi-coordination energy consumption.

The utility model discloses a clutch pressure plate with a good heat dissipation effect, and relates to the technical field of clutch pressure plates, the clutch pressure plate comprises a pressure plate body, the center of the pressure plate body is provided with a center hole, and the pressure plate body comprises an inner plate surface and an outer plate surface; a plurality of rivet holes are formed in the edge of the top of the pressing disc in a circular array mode. A thickening sleeve is arranged on the outer disc surface; a plurality of short protruding edges are arranged on the top of the thickening sleeve in a circular array mode, a plurality of arc-shaped heat dissipation through grooves are formed in the top of the thickening sleeve and the pressure plate body in a circular array mode, and all the short protruding edges are located between every two adjacent arc-shaped heat dissipation through grooves respectively. A long rib is arranged on one side, far away from the short rib, of the arc-shaped heat dissipation through groove; the problem that the clutch pedal makes contact with the clutch plate to slip when the clutch pedal is loosened is solved, the heat dissipation effect is achieved, deformation or cracking caused by temperature changes in the using process is avoided, and the service life of the pressure plate body is prolonged.

The invention discloses cable straightening equipment for communication engineering, and particularly relates to the technical field of cable straightening, the cable straightening equipment comprises a workbench, a plurality of heating plates are used for generating heat so as to heat the surface of a cable, the temperature of the cable reaches 60-90 DEG C, a second stepping motor is used for driving a shaping roller to rotate, and the shaping roller is used for shaping the cable. The surface of a cable insulation layer is subjected to primary shaping, then the shaped cable enters the first mounting frame in the conveying process, at the moment, the smooth inner wall faces of the two shaping covers carry out secondary shaping on the surface of the cable insulation layer, and then the cable moves to the interior of the second mounting frame along with conveying. When the cable is straightened, the plurality of air outlet nozzles blow to the surface of the cable to cool the cable, and in the process, the cable material is gradually shrunk, so that the internal stress is reduced or eliminated, and the effects of straightening the cable and relatively keeping the original rigidity and strength of the cable in the straightening process are achieved.

A variable stiffness joint for a flexible robot based on a hybrid electromagnet comprises a motor, a hybrid electromagnet fixing sleeve, a hybrid electromagnet, a joint housing, electrical pure iron and a motor support frame; the hybrid electromagnet fixing sleeve, the hybrid electromagnet and the electrical pure iron are located in the joint housing; wherein the joint stiffness adjustment part adopts the combined action of the hybrid electromagnet and the spring sheet, and has the advantages of fast stiffness adjustment response speed, no delay, no lag, etc. The magnetic force and stiffness can be maintained in the non-powered state, and the joint has energy-saving characteristics. At the same time, the joint also has the characteristics of simple movement form, simple manufacturing, and simple operation. The magnetic flux in the joint magnetic circuit system is jointly determined by the current in the permanent magnet and the excitation coil (copper coil). Therefore, by changing the magnitude and direction of the current in the excitation coil, the magnetic flux in the magnetic circuit system can be increased or decreased, that is, the joint stiffness can be increased or decreased, and the joint stiffness change is nonlinear.

This invention belongs to the field of prefabricated building technology and discloses a prefabricated ceiling and its installation method. A supporting component is provided between the keel component and the panel. The supporting component includes a hanger connecting the keel component and a supporting rod for connecting the panel. The panel has a bearing groove formed by bending at least two opposite sides. The bearing groove extends along the edge of the panel and has an open structure design at the corner of the panel to facilitate the lateral sliding or insertion of the supporting rod. This invention provides an independent supporting component composed of hangers and supporting rods between the keel component and the panel, so that the support of the decorative panel no longer depends on the continuous passage of the secondary keel. When the secondary keel path encounters electromechanical pipelines such as fire sprinkler pipes, it can be directly bypassed without on-site cutting; while the panel obtains effective support through adjustable supporting rods.

The utility model provides a kind of carbon fiber roller, including pipe body, inner flange, outer flange, pipe body includes inner end and outer end, inner flange is installed in inner end, and outer flange is installed in outer end;The pipe body is carbon fiber pipe body, and the pipe wall of carbon fiber pipe body is equipped with punching part, and carbon fiber roller realizes significant light weight and high specific strength simultaneously, and the layout of vent hole of punching part is optimized to balance ventilation efficiency and structural strength.

The invention discloses TPU (thermoplastic polyurethane) with deformation easy to recover, a preparation method of the TPU and application of the TPU in manufacturing toys. The TPU raw materials comprise a chain extender, polyisocyanate and one or more polyester polyols; the polyester polyol is formed by connecting an acid structural unit and an alcohol structural unit through an ester bond, the acid structural unit comprises at least one of terephthalic acid, oxalic acid and adipic acid and must comprise terephthalic acid, and the alcohol structural unit comprises at least one of butanediol, propylene glycol and ethylene glycol; the content of hard segments in the TPU ranges from 10 wt% to 50 wt%; tPU is softened at 30-60 DEG C, and is hardened and shaped at 10 DEG C or below. The preparation method comprises the following steps: adding the raw materials into a double-screw reactive extruder for reactive extrusion, and carrying out underwater pelletizing to obtain the TPU.