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

The invention discloses a joint section structure for a hybrid beam cable-stayed bridge. The joint section structure comprises a concrete beam-combined beam connecting structure connected between a concrete beam and a combined beam, wherein the combined beam comprises steel girders distributed in the longitudinal direction of the bridge, the steel girders are I-shaped and comprise steel girder top plates, steel girder base plates and steel girder web plates. The steel girder top plates and the steel girder base plates extend into the concrete beam, and the concrete beam-combined beam connecting structure comprises a front pressure bearing plate, a rear pressure bearing plate and a joint section steel web plate. The joint section structure is simple, reasonable in design, high in construction speed and good in using effect, and the problems of complicated structure, poor joint effect and the like existing in a steel-concrete joint portion structure can be solved. The invention further discloses a construction method of the joint section structure. The construction method comprises the steps of 1 erecting a construction support; 2 hoisting a steel structure; 3 constructing the concrete beam-combined beam connecting structure; 4 casting concrete. The construction method is simple in step, reasonable in design, convenient to construct, high in construction speed and good in construction effect.

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 a gas pressure boost metering device and particularly relates to a supercritical fluid pressure-boost generating and accurate metering device. The device consists of a filter, four stop valves, three solenoid valves, a pressure regulating valve, three pressure gauges, a gas booster pump, an exhaust valve, a safety valve, three pressure sensors, two supercritical fluid storage tanks, a pilot valve, an electronic pressure controller, a pneumatic control pressure regulating valve, a proportional valve, a bypass valve, an overflow valve, a control unit, a touch screen operation interface, and a pressure pipeline and a communication electric wire or cable which are connected with the components. The device has the advantages that generation and metering are integrated, and the booster pump is driven by gas and is automatically controlled to be switched on and off in a proportion-integration-differentiation (PID) mode; a metering system operates in a bypass backflow mode, and backflow gas is pressurized and recycled; and the fluid in the metering system always flows in a circulating mode, so that pressure jump caused by passage blocking is eliminated.

The present invention relates to a tensioning and buffering unit (2) used for a traction mechanism transmission device, comprising: a housing (8) used for being arranged in a way of resisting relative rotation with respect to a combustion engine, and containing fluid; and a cover piece (7) used for being arranged in a way of resisting relative rotation with respect to a tensioning rail (1), wherein, the cover piece (7) has a protruded part (22), the protruded part extends into the housing (8) and combines with a separation wall (21) which is fixedly connected with the housing (8) to divide an inner part (20) of the housing (8) into a high pressure cavity (23) and a reserve cavity (24). Alternatively, the housing is arranged in a way of resisting relative rotation with respect to the tensioning rail, and the cover piece is arranged in a way of resisting relative rotation with respect to the combustion engine. The present invention also relates to a traction mechanism transmission device of an automobile combustion engine, such as a chain transmission device or a belt transmission device, wherein, the traction mechanism transmission device has the tensioning rail (1) having the tensioning and buffering unit (2) which is arranged in the tensioning rail (1).

The invention discloses a salt removal device and method for supercritical reaction of hypersalinity water, and belongs to the technical field of heavy oil thermal recovery. According to the salt removal device, the hypersalinity water supercritical reactor is communicated with a high-pressure desalting cooling tank, inorganic salt precipitates and hypersalinity water in the hypersalinity water supercritical reactor enter the high-pressure desalting cooling tank, and the high-pressure desalting cooling tank is cooled by the cooling circulation tank on the periphery of the high-pressure desalting cooling tank; the temperature in the high-pressure desalting cooling tank is reduced, inorganic salt precipitates are dissolved in the hypersalinity water again, the hypersalinity water in the high-pressure desalting cooling tank enters the second-stage cooling salt discharging tank under the pressure difference by controlling the pressure difference between the second-stage cooling salt discharging tank and the high-pressure desalting cooling tank, the pressure of the hypersalinity water is further reduced, and then the salt is discharged through a bottom outlet of the secondary cooling salt discharging tank. According to the salt removal device, the problems of salt deposition and blockage of hypersalinity water in the supercritical reactor are reduced through differential pressure salt discharging.

The invention provides a cylinder and a machine including the cylinder. The cylinder includes: a cylinder body, a piston rod and a piston, the piston rod passes through the axial end of the cylinder body, and the piston is movably arranged inside the cylinder body and connected with the piston rod; the cylinder body includes: inner and outer cylinder bodies , the outer cylinder is fixedly sleeved outside the inner cylinder and sealed with it, and an outer chamber is formed between the inner and outer cylinders; the piston includes inner and outer piston bodies, the inner piston body is located in the inner cylinder, and the outer The piston body is located in the outer chamber and is used to move synchronously with the inner piston body; the first and second holes communicating with the outer chamber and the inner cylinder body are opened on the side wall of the inner cylinder body; The third and fourth holes communicated with the outer chamber and the outside; and the first and third holes are located on one side of the piston, and the second and fourth holes are located on the other side of the piston; such a structure can improve the cylinder service life, the preferred piston rod is only one, to simplify the structure of the cylinder.

The invention discloses a frame and a rotary bearing seat structure thereof. The rotary bearing seat structure of the frame comprises a rotary centre seat, a plurality of first rib plates and a plurality of second rib plates. The first rib plates and the second rib plates are fixed in the rotary centre seat, and the second rib plates are connected with the adjacent first rib plates. The first rib plates are radially disposed at intervals around the rotary centre seat, and each of the first rib plates comprises a main rib plate and wing plates formed by being integrally bent from the both ends of the main rib plate. The swing plates are connected with the inner wall of the rotary centre seat, the swing plates form arc transition with the main rib plate, the second rib plates and the main rib plate form a ring and round as a circular centre opening. Utilizing the technical scheme disclosed by the invention, the abrupt change of stress can be efficiently avoided, thereby preventing influence on the strength of the rotary bearing seat structure of the frame due to too intensive local stress.

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 application discloses a bulk acoustic wave resonator, which includes a substrate and a resonant functional layer arranged on the substrate. The resonant functional layer and the substrate are surrounded to form a resonant cavity. The resonant functional layer includes a bottom electrode layer formed on the substrate in turn. , a piezoelectric layer and a top electrode layer, and also includes a release cavity formed around the resonant cavity, the release cavity and the resonant cavity are located on different planes and communicate with each other in dislocation. Also disclosed is a method for making a bulk acoustic wave resonator, making one or more grooves on the surface of a substrate, depositing a sacrificial material to fill the grooves and forming a liner covering at least between the grooves on the surface of the substrate Bottom surface and part of the groove sacrificial layer, forming the bottom electrode, piezoelectric layer and top electrode layer in sequence, using the release liquid to release the sacrificial material through the piezoelectric layer from the uncovered area of ​​the bottom electrode layer to the release hole corresponding to the groove . The present application avoids the problem of stress mutation during the release process of the sacrificial layer, and the stability of the cavity structure and the consistency of the resonance performance of the device are significantly improved.

The invention discloses a replaceable shield tunneling machine cutterhead center rotary joint in a tunnel. The rotary joint comprises a housing, and a central rotating shaft is arranged in the housing; a connector is arranged at the end part of the central rotating shaft; the connector is connected with a cutterhead, a one-way transition plate is arranged between the connector and the cutterhead,a plurality of first bolt holes and second bolt holes are evenly formed in the periphery of the edge of the one-way transition plate, a plurality of one-way valve embedding holes and hydraulic oil holes are formed in the one-way transition plate, one-way valves are arranged in the one-way valve embedding holes, and sealing grooves are formed in the peripheries of the one-way valve embedding holesand the hydraulic oil holes. According to actual conditions, when a damaged central rotary joint needs to be disassembled, pressure in a soil bin is prevented from being suddenly changed, and major safety accidents are avoided. Spare parts can be replaced in time, the consumption of construction materials is reduced, the integrity rate and the utilization rate of equipment are improved, the downtime is shortened, and the production cost is reduced. Compared with the mode that the one-way valve is directly installed on the cutterhead, the joint is convenient to disassemble and check, and the on-way valve is convenient to maintain and replace.

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 relates to an X-type pin support joint for the top of a steel pipe column. The X-type pin support joint comprises the steel pipe column and an X-type casting. The X-type casting is arranged at the top of the steel pipe column and comprises an upper X-type-casting portion and a lower X-type-casting portion. The upper X-type-casting portion is positioned on the upper side of the top end of the steel pipe column. The lower X-type-casting portion is positioned in the steel pipe column, extends radially to the inner wall of the steel pipe column and is welded to the inner wall of the steel pipe column. The improved X-type pin support joint has the advantages that directions and positions of welding joints are changed, and strength, particularly strength of bearing pulling force and horizontal thrust, of the X-type pin support joint for the top of the steel pipe column is improved.

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.