39results about How to "Avoid sudden stress" patented technology

The invention discloses a double-tower hybrid beam cable-stayed bridge system. The double-tower hybrid beam cable-stayed bridge system comprises a hybrid beam composed of a concrete beam and a composite beam. The concrete beam and the composite beam are connected through a joint section. The concrete beam is a bilateral ribbed beam and comprises two concrete beam ribs. The composite beam comprises two main steel beams, and the main steel beams are each of an I shape and each comprise a main steel beam top plate, a main steel beam bottom plate and a main beam steel web. The joint section comprises a concrete beam rib-main steel beam connection structure composed of a front pressure bearing plate, a rear pressure bearing plate and a joint section steel web, and the main steel beam top plates and the main steel beam bottom plates stretch into the concrete beam ribs. The double-tower hybrid beam cable-stayed bridge system is reasonable in structural design, convenient to construct, high in construction speed, good in use effect and good in connection effect of a steel-concrete joint part. Meanwhile, the invention further discloses a construction method of the double-tower hybrid beam cable-stayed bridge system. The construction method includes the steps of lower portion supporting structure and main tower construction and hybrid beam construction. The construction method is simple, easy to implement, short in construction period and good in construction effect.

The invention discloses a volatile communication structure for end furnace chambers of a carbon secondary roasting furnace. The structure comprises the carbon secondary roasting furnace; both ends of the carbon secondary roasting furnace are provided with a volatile communication device; and ends of various bins of the end furnace chambers are provided with bin volatile passageways, and volatile passageway branch pipes used for connecting the volatile communication device and the bin volatile passageways. The structure has the advantages that the structure can make volatile produced in the bins of a downstream furnace chamber collected into the volatile communication device under the condition of basically same negative pressure and resistance. The condensation phenomenon of the volatile cannot appear in a pipeline, and the smoothness of the flow of the volatile is ensured during the operation across the central line of the furnace. The temperature of the furnace chambers and the binsin a flame system has even distribution, which is favorable for improving the quality of secondary roasting. The structure effectively avoids the pressure jump in the related bins, and is favorable for guaranteeing the personal safety of operation personnel.

The invention relates to the technical field of control valves, in particular to a motorized valve for adjusting flow rate of fluid. The motorized valve comprises a valve seat assembly. The valve seat assembly comprises a valve seat provided with a first valve cavity and a valve core seat fixed on the valve seat and provided with a valve opening. A second valve cavity for the fluid to circulate is arranged in the valve core seat. The first valve cavity and the second valve cavity are communicated through a communication portion. The valve core seat is further provided with a guiding section matched with a valve needle, and the inner diameter of the guiding section is smaller than that of the second valve cavity. According to the motorized valve, the second valve cavity with the inner diameter larger than the guiding section of the valve needle is arranged in the valve core seat, and the motorized valve can contain large refrigeration volume under the condition that the appearance and the size of the motorized valve are not changed. In addition, a circulation sectional area ratio of each circulation portion in a flow channel is configured so that mutating of pressure in the flow channel is avoided, the mutating phenomenon when refrigerant circulates is avoided, and noise of the refrigerant is avoided.

The invention discloses a harvester for leaves of agave sisalana. A lifting frame is movably connected up and down with the front end of a vehicle body, a piston is transversely fixed at the front endof the lifting frame, a piston rod of the piston extends towards one side of the vehicle body, and a harvesting device is fixed at the end part of the piston rod; and the harvesting device comprisesa ring sleeve, a hollow cavity is arranged in the ring sleeve, a groove opening is arranged in the middle of the top surface of the ring sleeve, an annular rod which is in slide connection along the ring sleeve is arranged in the ring sleeve, one side, far away from the piston, of the ring sleeve is provided with a gap A, the annular rod is provided with a gap B, the straight line distance of a gap with a smaller radian in the gap A and the gap B is greater than or equal to the diameter of the stem of the agave sisalana, the top, located at in the range of the groove opening, of the annular rod is inwards provided with cutting knives, and the distance between each cutting knife and the circle center of the annular rod is greater than the radius of the stem of the agave sisalana. Accordingto the above structure, the harvester for the leaves of the agave sisalana provided by the invention realizes mechanized harvesting of the leaves of the agave sisalana, thereby changing the industry rule that the agave sisalana can only be manually harvested, greatly reducing the labor intensity of harvesting of the leaves of the agave sisalana, and improving the harvesting efficiency of the leaves of the agave sisalana.

The invention discloses an additive manufacturing-based product lightweight design method. The method comprises the following steps: 1, establishing a parametric porous structure database, and establishing corresponding relationships between various parametric structures and mechanical property; 2, carrying out finite element analysis on an original product model structure; 3, adjusting a parametric unit structure to satisfy difference demands, for the mechanical property, of different mesh regions in the product; 4, carrying out filling replacement on the regions with excess performance in the products by using a lightweight unit structure; 5, carrying out mechanical property check on a lightweight product structure through finite element analysis. According to the method disclosed in the invention, the finite element analysis and the gradient distribution design of a parametric porous structure are combined, and different lightweight strategies are adopted in allusion to the performance demands of different parts of function parts under the premise of satisfying the mechanical property, so that the reasonable and efficient lightweight design is realized, and lightweight products can be prepared by using an additive manufacturing method.

The invention discloses a steel beam inserted type steel-concrete combined section construction of a composite beam. The construction comprises a concrete beam-composite beam connecting structure connected between a concrete beam and the composite beam, and the composite beam comprises multiple steel beams and concrete bridge deck slabs. Each steel beam is a steel plate beam and comprises an upper flange plate, a lower flange plate and a web plate. The concrete beam-composite beam connecting structure comprises a front bearing plate, multiple rear bearing plates, multiple upper transverse penetrating steel bars, multiple lower transverse penetrating steel bars and multiple combined shearing resistant connecting structures located on the joint of the concrete beam and the composite beam. Each combined shearing resistant connecting structure comprises two upper rigid transition stiffening ribs, two lower rigid transition stiffening ribs, two upper longitudinal stiffening ribs and two lower longitudinal stiffening ribs. Shear nails are arranged on the sections, inserted into the concrete beam, of the upper flange plates and the lower flange plates. The steel beam inserted type steel-concrete combined section construction of the composite beam is simple in structure, reasonable in design, easy and convenient to construct and good in using effect, the connecting effect for constructing and forming steel-concrete joint parts is good, and stress is reasonable.

The unit (2) has a housing (8) rotationally fixed to an internal combustion engine. A lid is attached relative to a clamping rail (1). The lid comprises a projection projected into interior part of the housing. The interior part of the housing is divided into a high pressure chamber and a reservoir chamber. An end of the lid is provided with a spring (9). A check valve is incorporated into the reservoir chamber. A pressure compensation element is provided in the reservoir chamber. The projection is sealed at an inner wall of the housing.

The invention discloses a multi-section type rubber membrane sealed gasometer. The gasometer comprises a piston truss arranged in the gasometer, and T baffle plates are arranged on the outer layer of the piston truss. The key point is that a fixed pulley is arranged on the top of the gasometer, one end of a steel wire rope is connected with the T baffle plates, and the other end of the steel wire rope moves around the fixed pulley and then is connected with a balance weight. The balance weight is used for balancing the gravity of the T baffle plates, and a phenomenon of pressure jump of a piston during running of the piston is avoided.

The invention relates to a preparation process of thick-fragrance camellia oil, which includes the steps of: pretreatment, cold squeezing, raw oil filtration, and adsorption. In the process, camellia seeds are subjected to cold squeezing without heating, so that generation of benzopyrene, acrylamide and the like cancerogenic substances is avoided during the squeezing process; the process is high in oil yield, is good in oil-residue separation effect and can increase service life of equipment; meanwhile, volatile substances, generated during the squeezing process, and squalene and vitamin E are mixed with refined camellia oil, thus increasing beneficial substances in the camellia oil.