19results about How to "Reduce stress concentration effects" patented technology

The invention provides a cross-linking agent-free liquid crystal elastomer synthesis method, a liquid crystal elastomer and a body temperature driven actuator, the liquid crystal elastomer with polymer chains aligned is prepared according to the cross-linking agent-free liquid crystal elastomer synthesis method, the energy storage modulus of the liquid crystal elastomer is 0.1-1 MPa, and the liquid crystal elastomer is a liquid crystal elastomer with polymer chains aligned. And the temperature TNI of the nematic phase to the isotropic phase of the liquid crystal elastomer is 60-62 DEG C. The actuator comprises the liquid crystal elastomer and a polyimide film, the liquid crystal elastomer is located on the surface of the polyimide film, and the polyimide film is bent through deformation of the liquid crystal elastomer. The polyimide film serves as a restraint layer and is used for enabling the liquid crystal elastomer to elastically reset. The liquid crystal elastomer can be driven by body temperature to deform.

The invention provides a high-strength Cube texture and high-formability aluminum alloy material for a vehicle as well as a preparation method and application of the high-strength Cube texture and high-formability aluminum alloy material. The alloy material comprises the following components: Mg, Si, Zr and Al, along with addition of a proper amount of Zr element and a related treatment process, a strong Brass texture is formed by combining large-deformation rolling in the hot rolling process; meanwhile, the added Zr element effectively controls the size of the Mg2Si phase, the nucleation rate of Cube crystal grains can be effectively increased when a follow-up suitable recrystallization process is matched, the crystal grains have obvious growth advantages relative to other orientations in the follow-up growth process, the final alloy material has a high-strength Cube texture, and the high-strength Cube texture is obtained. According to the texture, the stress concentration effect can be effectively relieved in the aluminum alloy plastic deformation process, the cooperative deformation capacity between crystal grains is improved, and the alloy formability can be effectively improved. And the prepared alloy plate is suitable for industrial application.

The invention relates to a beam-slab composite lattice structure, in particular to a beam-slab composite lattice structure with a non-uniform-thickness skin and a preparation process of the beam-slab composite lattice structure, and solves the technical problems that an existing beam-slab composite lattice structure is insufficient in light weight degree, and the skin and unit cell design is relatively split. According to the beam-slab composite lattice structure, the skin is non-uniform in thickness, the thickness of the skin and the diameter of the supporting beam of the unit cell are related to the stress of the corresponding position of the skin, and the rigidity of the structure is improved. By adjusting the thickness of the unit cell skin of the composite unit cell, the lightweight degree of the structure can be further improved. And meanwhile, the transition platform is arranged between the two adjacent unit cell skins, so that the connectivity of the adjacent composite unit cells can be enhanced and the stress concentration effect can be reduced while the lightweight requirement of the structure is met. The invention further provides a preparation process of the beam-slab composite lattice structure with the non-uniform-thickness skin, and synchronous integrated gradient design of the skin layer and the unit cell layer can be achieved.

The present invention relates to the technical field of building materials (IPC classification number is C04B28 / 04), and in particular to a high-temperature resistant inorganic artificial stone and a preparation method thereof, comprising an inorganic artificial stone substrate and a high-temperature resistant heat-insulating coating coated on the surface of the inorganic artificial stone substrate. In the present invention, the simultaneous addition of fillers, coupling agents, and expansion agents can form chemical bonds between cement gel products and fibers, can enhance the bonding force between fibers and aggregates and cement, improve the flexural strength and toughness of the board, resist high-temperature deformation and cracking of the board, and the addition of thickeners makes the board have higher conjunctival strength and adhesion, can improve the density of the board, and improve the working performance of the board. The surface heat-resistant temperature of the prepared inorganic artificial stone can reach 300-400°C, which broadens the application range of the inorganic artificial stone.

The present invention discloses a wind turbine structure and a platform support seat for stress diffusion thereof, which is used for being installed on the inner wall of a tower, and is characterized in that it comprises: a stress diffusion support (1) fixed on the inner wall of the tower, and the stress diffusion support (1) comprises a main body fixedly connected to the tower and a stress diffusion space provided on the main body. By arranging the stress diffusion space on the main body, stress diffusion is facilitated, the effect of stress concentration is reduced, and safety is improved.

The utility model discloses a light photovoltaic assembly and photovoltaic power generation equipment, and relates to the technical field of photovoltaic assemblies. The light photovoltaic module comprises a battery piece, a flexible welding strip, a conductive plate and a bus bar; a plurality of battery pieces are sequentially arranged along a first direction; the plurality of battery pieces arranged along the first direction form a group, and a plurality of groups of battery pieces are arranged along the second direction; the flexible welding strip is in welding connection with the first electrodes of the battery pieces arranged in the first direction; the current-conducting plate is sequentially connected with the second electrodes of the battery pieces arranged along the first direction in a welding manner; the bus bars are provided with a plurality of sections, each section of bus bar is correspondingly arranged between two adjacent groups of battery pieces, and the bus bars are respectively connected with the adjacent flexible welding strips and the current-conducting plates in a welding manner; according to the light photovoltaic module provided by the utility model, the battery pieces are grouped and connected in parallel, and then each group of battery pieces are connected in series and boosted, so that the circuit connection stability of each battery piece can be effectively ensured, and the overall use reliability of the light photovoltaic module is improved.

The application discloses a low-rigidity thin-wall gear ring end face grinding tool, which comprises an electric permanent magnetic chuck, three fine-tuning precision lifting platforms, three arc-shaped clamping blocks and a flatness measuring device, the three fine-tuning precision lifting platforms and the three arc-shaped clamping blocks are alternately arranged on the surface of the electric permanent magnetic chuck with equal intervals. The application changes the traditional end face adsorption clamping into gear ring cylindrical surface clamping, changes the clamping force from axial to radial, and transfers the error to the non-sensitive direction of machining, so that the gear ring positioning can be rapidly realized, and the machining efficiency of the gear ring is improved; the end face will not be deformed and the error reflection problem will not occur under the large magnetic force, and the clamping force will not affect the precision of the end face grinding process. The electric permanent magnetic chuck is adopted for clamping, so that the deformation problem of the clamping position in the traditional clamping mode is avoided, and the end face grinding production efficiency is improved.

The utility model discloses a power end shell of a plunger pump and the plunger pump, the power end shell of the plunger pump comprises a bearing seat, a sliding sleeve seat, a spacing plate used for supporting the bearing seat and a front end plate provided with a connecting point used for fixing a fluid end, and a plurality of first reinforcing ribs are arranged at the connecting position between the bearing seat and the spacing plate. The reinforcing ribs are arranged at the specific positions of the power end shell, so that the stress state of the power end shell is improved, the stress concentration effect of the power end shell can be effectively reduced, the rigidity and the strength of a product structure are improved, and meanwhile the service life of the plunger pump can be prolonged.

The utility model discloses a spiral heating pipe structure for a vehicle-mounted instant water boiler, which relates to the technical field of heating pipes and comprises a spiral heating pipe main body, a main body buffer mechanism is mounted in the spiral heating pipe main body, and two ends of the spiral heating pipe main body are respectively and fixedly connected with a connecting hose. According to the utility model, through the flexible connection design of the connecting hose and the two ends of the spiral heating pipe main body, the heating pipe and the vehicle-mounted instant water boiler main body form an elastic connection structure capable of buffering, so that when a vehicle bumps, external vibration energy can be absorbed through flexible deformation of the hose, and direct stress conduction caused by rigid connection is avoided; and the connection stability of the end part of the heating pipe and the equipment main body can be ensured, and direct pulling and impact of vibration on the spiral section are reduced.

The invention discloses a pneumatic control system of an upper cover driving device of a vacuum chamber and a control method of the pneumatic control system, and relates to the technical field of semiconductor equipment. The pneumatic control system is provided with the first isolating valve, the first isolating valve is controlled to be opened and closed through the first protective gas circuit connected with the second driving circuit, then the cover opening and closing protective circuit is controlled to be communicated with the gas inlet pipeline, and it is guaranteed that only when the rotating mechanism is fixed, the cover opening and closing protective circuit is closed. And the opening and closing cover protection loop can be opened under the condition that the lifting cylinder does not rotate along with the rotating mechanism. A double-hand control valve is arranged in a cover opening and closing protection loop, after the cover opening and closing protection loop is opened, an operator is required to open a pneumatic control valve only through double-hand operation, an air inlet pipeline and a first driving loop are communicated through the pneumatic control valve, then a lifting air cylinder is driven to act, and cover opening and closing are achieved; and the safety of cover opening and closing operation is improved.

The utility model discloses an assembly type double-T-beam flexible steel strand hanging ring which comprises a prefabricated beam body, a galvanized round pipe and prestressed steel strands, the galvanized round pipe is arranged at the top of the prefabricated beam body, the prestressed steel strands are arranged in the galvanized round pipe and the prefabricated beam body, and the prestressed steel strands are used for penetrating through the galvanized round pipe to penetrate into the prefabricated beam body to be connected and fixed. The prefabricated beam body is of an upper structure of an assembly type concrete bridge, the number of the galvanized round pipes is two, the two galvanized round pipes form a single ring, the two galvanized round pipes are fixed through double-face welding seams, and the two galvanized round pipes are in a U shape. The prestressed steel strand is used for penetrating through the galvanized round pipe, going deep into the precast beam body and then being exploded and bent to form the inverted L-shaped structure, and the inverted L-shaped structure is used for being connected with precast beam body concrete, so that the anchoring capacity of the prestressed steel strand is enhanced; and through the anchoring steel plate and the inverted-L-shaped structure, the stress transmission range can be enlarged, the stress concentration effect is reduced, and meanwhile the compressive rigidity and stability of the anchoring position are improved.

The belt hook claw of the park moped comprises a left hook claw assembly and a right hook claw assembly, the left hook claw assembly comprises a left upper fork opening, a left lower fork opening, a left locking installation hole and a connecting block fixing locking hole, and the right hook claw assembly comprises a right upper fork opening, a right lower fork opening, a right locking installation hole and a water eliminating hole. Disc brake fixing holes are formed in the inner side of one end of the right lower fork opening, a groove is formed between the disc brake fixing holes, the groove is trapezoidal, a left hook claw opening is formed in one side of the top of the left hook claw assembly, a stress dispersion groove is formed in the inner wall of the left hook claw opening, a right hook claw opening is formed in one side of the top of the right hook claw assembly, and a stress dispersion groove is formed in the inner wall of the right hook claw opening. A stress dispersion groove is formed in the inner wall of the right hook claw opening. According to the utility model, the stress dispersion groove is arranged at the hook claw opening, so that concentrated stress is effectively dispersed, the stress concentration effect is reduced, the bearing capacity is improved, damage and deformation are reduced, the service life of the hook claw opening is prolonged, and the equipment reliability is improved.

The invention discloses an asphalt pavement coring hole prefabricating and filling method based on porosity, which comprises the following steps: drilling and sampling an asphalt pavement to obtain a pavement core sample and a coring hole; processing the bottom of the coring hole in the pavement to form a pavement hole with a flat bottom, and measuring the depth H0 of the pavement hole; measuring the thicknesses H1, H2 and H3 of the upper surface layer, the middle surface layer and the lower surface layer of the pavement core sample to obtain the thickness H4 of the roadbed part of the pavement hole, wherein H4 = H0-H1-H2-H3; measuring the porosity A1, A2 and A3 of the remaining parts of the upper surface layer, the middle surface layer and the lower surface layer; preparing an upper surface layer filling piece, a middle surface layer filling piece and a lower surface layer filling piece with the same porosity; a roadbed filling piece with the thickness of H4 is manufactured; and the upper surface layer filling piece, the middle surface layer filling piece, the lower surface layer filling piece and the roadbed filling piece are sequentially stacked and bonded together from top to bottom and are filled into the pavement holes. The filling method has the advantages of identical materials, identical porosity, approximate mechanical properties, approximate deformation performance, high construction efficiency and the like.

The present invention discloses a proximal femoral fracture intramedullary fixation device, comprising a proximal femoral anchoring support, a femoral intramedullary nail and a proximal locking nail of the intramedullary nail, wherein the proximal femoral anchoring support and the femoral intramedullary nail are connected by the proximal locking nail of the intramedullary nail; the proximal femoral anchoring support of the present application can be made by an integrated molding process, therefore, it has better mechanical strength, is not easy to break, and can significantly reduce the incidence of internal fixation failure. The proximal femoral anchoring support of the present application can be closely and fully attached to the cortical bones around the proximal femur, especially to the medial cortex, therefore, the proximal femoral anchoring support can fully support the surrounding cortex, especially the supporting effect on the medial cortex, which is crucial for the sustained stability after fracture surgery. The contact area between the body of the proximal femoral anchoring support and the femoral intramedullary nail is large, which can significantly reduce the effect of stress concentration and reduce the probability of fracture at the contact part between the two.

The invention discloses a preparation method for improving the strength and plasticity of martensitic stainless steel, which comprises the following steps: heating martensitic steel to the temperature above Ac3, preserving heat for a period of time to completely austenitize the structure, and then quickly spraying water to cool the austenitized martensitic steel to a metastable austenite area; warm rolling is conducted on the heated martensitic steel; after warm rolling, rapidly cooling to a temperature lower than the martensite transformation initial temperature; the quenched steel is subjected to partition treatment, and the material is reheated; and cooling to room temperature after the partitioning treatment is finished, thereby obtaining the product. The purpose is achieved mainly through a warm rolling-quenching-partitioning process, according to the process, warm rolling machining is carried out in a metastable austenite area, grains are remarkably refined, the dislocation density in a matrix is improved, effective distribution of carbon elements is promoted in the subsequent quenching and partitioning stages, and finally a certain amount of retained austenite is reserved in a structure.

The invention provides a flip chip ball grid array packaging structure, a preparation method thereof and electronic equipment. The preparation method at least comprises the following steps: providing a substrate provided with a bonding pad for welding a chip resistor required by flip chip ball grid array packaging and a corresponding solder resist window; solder paste is applied to the bonding pad, and a chip resistor is mounted on the bonding pad; reflow soldering is carried out, so that the solder paste is melted and a welding spot is formed; and integrally wrapping the chip resistor body and the solder paste welding spots by adopting epoxy resin so as to encapsulate and fix the chip resistor and the solder paste area at the bottom of the chip resistor, thereby obtaining the flip chip ball grid array package. By means of the method, the shape of the welding spot is optimized, the stress concentration effect is weakened, and the welding spot shows excellent anti-fatigue performance in the follow-up temperature cycle test.

The invention relates to an electrocardiogram monitoring device and an electrocardiogram monitoring system. The electrocardio monitoring device comprises an electrocardio signal processing device, a flexible thin film device attached to the skin surface of a target user and an on-skin thin film socket device, and the flexible thin film device is connected with the electrocardio signal processing device through the on-skin thin film socket device; the flexible film device is used for collecting electrocardiosignals of a target user and transmitting the electrocardiosignals to the skin film socket device; the skin film socket device is used for receiving the electrocardiosignal and transmitting the electrocardiosignal to the electrocardiosignal processing device; and the electrocardiosignal processing device is used for carrying out online processing on the electrocardiosignal transmitted by the skin film socket device so as to determine the electrocardiosignal information of the target user. According to the electrocardiogram monitoring device, the accuracy of the monitored electrocardiogram signals is higher, online reasoning can be achieved, energy consumption of remote transmission of the electrocardiogram signals is reduced, the electrocardiogram signal analysis efficiency is improved, and then the working efficiency of the electrocardiogram monitoring device is improved.

The utility model discloses a displacement sensor, which comprises a probe, a spring, a measuring sheet, a support and a shell, according to the utility model, two measuring sheets are arranged side by side on one side of a support close to a baffle at the head, and each measuring sheet comprises an elastic thin sheet and two resistance strain gauges fixed on the front and back surfaces of the elastic thin sheet; a strain gauge is changed into two parts, a bolt and a spring are added to form a new half-bridge circuit, the new half-bridge circuit and an existing circuit form two circuits, resistance change of the strain gauge is measured, displacement variation is converted into electric signal variation, two groups of data are obtained at the same time, measurement errors are reduced, and normal use of the displacement sensor is guaranteed at the same time. When one circuit breaks down, the other circuit can be used normally. The temperature measurement module is added in the displacement sensor, the influence of the temperature on the measurement result can be quantitatively analyzed according to the experimental result, and the system error of the displacement sensor measurement can be reduced by reducing the influence of the temperature on the element.

The utility model provides a connecting node. The connecting node comprises a column pipe, a vertical web member, at least one lower chord member and at least one diagonal web member, the bottom end of the column pipe is fixed on the support, and a sealing plate is arranged at the top end of the column pipe; the bottom end of the vertical web member is fixed on a sealing plate of the column pipe; one end of the at least one lower chord member is fixed on the outer side surface of the column pipe; and one end of the diagonal web member is fixed at the crossed position of the lower chord member and the column pipe. By means of the connecting structure, the force transmission path between the space steel structure roof and the support can be more concise, and the stress reliability of a connecting joint is improved. Furthermore, the welding seam distance can be increased, the stress concentration effect is greatly reduced, and the node connection quality is improved.